X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=shell%2Fash.c;h=af96c4d1da2365077ce4fd4441db598219c9a07d;hb=82d38dab917754c9c37aaa7e414a47318b5082fe;hp=2de61dad926b1eaa1e5252c126873fd2737d7d89;hpb=f4dff773553da8b4a5a66205e920a82732156851;p=oweals%2Fbusybox.git diff --git a/shell/ash.c b/shell/ash.c index 2de61dad9..af96c4d1d 100644 --- a/shell/ash.c +++ b/shell/ash.c @@ -31,7 +31,6 @@ * */ - /* * The follow should be set to reflect the type of system you have: * JOBS -> 1 if you have Berkeley job control, 0 otherwise. @@ -43,115 +42,114 @@ * a quit signal will generate a core dump. */ #define DEBUG 0 - - #define IFS_BROKEN - #define PROFILE 0 - -#include "busybox.h" +#if ENABLE_ASH_JOB_CONTROL +#define JOBS 1 +#else +#define JOBS 0 +#endif #if DEBUG #define _GNU_SOURCE #endif - -#include -#include -#include -#include -#include -#include - -#include -#include -#include -#include - -#include -#include -#include -#include -#include -#include -#include -#include +#include "busybox.h" /* for struct bb_applet */ #include #include -#include -/*#include */ -#include #include - -#ifdef CONFIG_ASH_JOB_CONTROL -#define JOBS 1 -#else -#undef JOBS -#endif - -#if JOBS || defined(CONFIG_ASH_READ_NCHARS) +#if JOBS || ENABLE_ASH_READ_NCHARS #include #endif - -#include "cmdedit.h" - -#ifdef __GLIBC__ -/* glibc sucks */ -static int *dash_errno; -#undef errno -#define errno (*dash_errno) -#endif +extern char **environ; #if defined(__uClinux__) #error "Do not even bother, ash will not run on uClinux" #endif -#if DEBUG -#define _DIAGASSERT(assert_expr) assert(assert_expr) -#else -#define _DIAGASSERT(assert_expr) -#endif +/* ============ Misc helpers */ -#ifdef CONFIG_ASH_ALIAS -/* alias.h */ +#define xbarrier() do { __asm__ __volatile__ ("": : :"memory"); } while (0) -#define ALIASINUSE 1 -#define ALIASDEAD 2 +/* C99 say: "char" declaration may be signed or unsigned default */ +#define signed_char2int(sc) ((int)((signed char)sc)) -struct alias { - struct alias *next; - char *name; - char *val; - int flag; -}; -static struct alias *lookupalias(const char *, int); -static int aliascmd(int, char **); -static int unaliascmd(int, char **); -static void rmaliases(void); -static int unalias(const char *); -static void printalias(const struct alias *); +/* ============ Shell options */ + +static const char *const optletters_optnames[] = { + "e" "errexit", + "f" "noglob", + "I" "ignoreeof", + "i" "interactive", + "m" "monitor", + "n" "noexec", + "s" "stdin", + "x" "xtrace", + "v" "verbose", + "C" "noclobber", + "a" "allexport", + "b" "notify", + "u" "nounset", + "\0" "vi" +#if DEBUG + ,"\0" "nolog" + ,"\0" "debug" #endif +}; + +#define optletters(n) optletters_optnames[(n)][0] +#define optnames(n) (&optletters_optnames[(n)][1]) -/* cd.h */ +enum { NOPTS = ARRAY_SIZE(optletters_optnames) }; +static char optlist[NOPTS] ALIGN1; -static void setpwd(const char *, int); +#define eflag optlist[0] +#define fflag optlist[1] +#define Iflag optlist[2] +#define iflag optlist[3] +#define mflag optlist[4] +#define nflag optlist[5] +#define sflag optlist[6] +#define xflag optlist[7] +#define vflag optlist[8] +#define Cflag optlist[9] +#define aflag optlist[10] +#define bflag optlist[11] +#define uflag optlist[12] +#define viflag optlist[13] +#if DEBUG +#define nolog optlist[14] +#define debug optlist[15] +#endif -/* error.h */ +/* ============ Misc data */ -/* - * Types of operations (passed to the errmsg routine). - */ +static char nullstr[1] ALIGN1; /* zero length string */ +static const char homestr[] ALIGN1 = "HOME"; +static const char snlfmt[] ALIGN1 = "%s\n"; +static const char illnum[] ALIGN1 = "Illegal number: %s"; +static char *minusc; /* argument to -c option */ -static const char not_found_msg[] = "%s: not found"; +/* pid of main shell */ +static int rootpid; +/* shell level: 0 for the main shell, 1 for its children, and so on */ +static int shlvl; +#define rootshell (!shlvl) +/* trap handler commands */ +static char *trap[NSIG]; +static smallint isloginsh; +/* current value of signal */ +static char sigmode[NSIG - 1]; +/* indicates specified signal received */ +static char gotsig[NSIG - 1]; +static char *arg0; /* value of $0 */ -#define E_OPEN "No such file" /* opening a file */ -#define E_CREAT "Directory nonexistent" /* creating a file */ -#define E_EXEC not_found_msg+4 /* executing a program */ +/* ============ Interrupts / exceptions */ /* * We enclose jmp_buf in a structure so that we can declare pointers to @@ -162,16 +160,11 @@ static const char not_found_msg[] = "%s: not found"; * to an inner scope, set handler to point to a jmploc structure for the * inner scope, and restore handler on exit from the scope. */ - struct jmploc { jmp_buf loc; }; - -static struct jmploc *handler; +static struct jmploc *exception_handler; static int exception; -static volatile int suppressint; -static volatile sig_atomic_t intpending; - /* exceptions */ #define EXINT 0 /* SIGINT received */ #define EXERROR 1 /* a generic error */ @@ -179,12 +172,24 @@ static volatile sig_atomic_t intpending; #define EXEXEC 3 /* command execution failed */ #define EXEXIT 4 /* exit the shell */ #define EXSIG 5 /* trapped signal in wait(1) */ - - +static volatile int suppressint; +static volatile sig_atomic_t intpending; /* do we generate EXSIG events */ static int exsig; /* last pending signal */ -static volatile sig_atomic_t pendingsigs; +static volatile sig_atomic_t pendingsig; + +/* + * Sigmode records the current value of the signal handlers for the various + * modes. A value of zero means that the current handler is not known. + * S_HARD_IGN indicates that the signal was ignored on entry to the shell, + */ + +#define S_DFL 1 /* default signal handling (SIG_DFL) */ +#define S_CATCH 2 /* signal is caught */ +#define S_IGN 3 /* signal is ignored (SIG_IGN) */ +#define S_HARD_IGN 4 /* signal is ignored permenantly */ +#define S_RESET 5 /* temporary - to reset a hard ignored sig */ /* * These macros allow the user to suspend the handling of interrupt signals @@ -192,291 +197,229 @@ static volatile sig_atomic_t pendingsigs; * much more efficient and portable. (But hacking the kernel is so much * more fun than worrying about efficiency and portability. :-)) */ - -#define xbarrier() ({ __asm__ __volatile__ ("": : :"memory"); }) -#define INTOFF \ - ({ \ +#define INT_OFF \ + do { \ suppressint++; \ xbarrier(); \ - 0; \ - }) -#define SAVEINT(v) ((v) = suppressint) -#define RESTOREINT(v) \ - ({ \ - xbarrier(); \ - if ((suppressint = (v)) == 0 && intpending) onint(); \ - 0; \ - }) -#define EXSIGON() \ - ({ \ - exsig++; \ - xbarrier(); \ - if (pendingsigs) \ - exraise(EXSIG); \ - 0; \ - }) -/* EXSIG is turned off by evalbltin(). */ + } while (0) +/* + * Called to raise an exception. Since C doesn't include exceptions, we + * just do a longjmp to the exception handler. The type of exception is + * stored in the global variable "exception". + */ +static void raise_exception(int) ATTRIBUTE_NORETURN; +static void +raise_exception(int e) +{ +#if DEBUG + if (exception_handler == NULL) + abort(); +#endif + INT_OFF; + exception = e; + longjmp(exception_handler->loc, 1); +} -static void exraise(int) ATTRIBUTE_NORETURN; -static void onint(void) ATTRIBUTE_NORETURN; +/* + * Called from trap.c when a SIGINT is received. (If the user specifies + * that SIGINT is to be trapped or ignored using the trap builtin, then + * this routine is not called.) Suppressint is nonzero when interrupts + * are held using the INT_OFF macro. (The test for iflag is just + * defensive programming.) + */ +static void raise_interrupt(void) ATTRIBUTE_NORETURN; +static void +raise_interrupt(void) +{ + int i; + sigset_t mask; -static void sh_error(const char *, ...) ATTRIBUTE_NORETURN; -static void exerror(int, const char *, ...) ATTRIBUTE_NORETURN; + intpending = 0; + /* Signal is not automatically re-enabled after it is raised, + * do it ourself */ + sigemptyset(&mask); + sigprocmask(SIG_SETMASK, &mask, 0); + /* pendingsig = 0; - now done in onsig() */ -static void sh_warnx(const char *, ...); + i = EXSIG; + if (gotsig[SIGINT - 1] && !trap[SIGINT]) { + if (!(rootshell && iflag)) { + signal(SIGINT, SIG_DFL); + raise(SIGINT); + } + i = EXINT; + } + raise_exception(i); + /* NOTREACHED */ +} -#ifdef CONFIG_ASH_OPTIMIZE_FOR_SIZE +#if ENABLE_ASH_OPTIMIZE_FOR_SIZE static void -inton(void) { +int_on(void) +{ if (--suppressint == 0 && intpending) { - onint(); + raise_interrupt(); } } -#define INTON inton() -static void forceinton(void) +#define INT_ON int_on() +static void +force_int_on(void) { suppressint = 0; if (intpending) - onint(); + raise_interrupt(); } -#define FORCEINTON forceinton() +#define FORCE_INT_ON force_int_on() #else -#define INTON \ - ({ \ +#define INT_ON \ + do { \ xbarrier(); \ - if (--suppressint == 0 && intpending) onint(); \ - 0; \ - }) -#define FORCEINTON \ - ({ \ + if (--suppressint == 0 && intpending) \ + raise_interrupt(); \ + } while (0) +#define FORCE_INT_ON \ + do { \ xbarrier(); \ suppressint = 0; \ - if (intpending) onint(); \ - 0; \ - }) -#endif /* CONFIG_ASH_OPTIMIZE_FOR_SIZE */ - -/* expand.h */ + if (intpending) \ + raise_interrupt(); \ + } while (0) +#endif /* ASH_OPTIMIZE_FOR_SIZE */ -struct strlist { - struct strlist *next; - char *text; -}; +#define SAVE_INT(v) ((v) = suppressint) +#define RESTORE_INT(v) \ + do { \ + xbarrier(); \ + suppressint = (v); \ + if (suppressint == 0 && intpending) \ + raise_interrupt(); \ + } while (0) -struct arglist { - struct strlist *list; - struct strlist **lastp; -}; +#define EXSIGON \ + do { \ + exsig++; \ + xbarrier(); \ + if (pendingsig) \ + raise_exception(EXSIG); \ + } while (0) +/* EXSIG is turned off by evalbltin(). */ /* - * expandarg() flags + * Ignore a signal. Only one usage site - in forkchild() */ -#define EXP_FULL 0x1 /* perform word splitting & file globbing */ -#define EXP_TILDE 0x2 /* do normal tilde expansion */ -#define EXP_VARTILDE 0x4 /* expand tildes in an assignment */ -#define EXP_REDIR 0x8 /* file glob for a redirection (1 match only) */ -#define EXP_CASE 0x10 /* keeps quotes around for CASE pattern */ -#define EXP_RECORD 0x20 /* need to record arguments for ifs breakup */ -#define EXP_VARTILDE2 0x40 /* expand tildes after colons only */ -#define EXP_WORD 0x80 /* expand word in parameter expansion */ -#define EXP_QWORD 0x100 /* expand word in quoted parameter expansion */ - - -union node; -static void expandarg(union node *, struct arglist *, int); -#define rmescapes(p) _rmescapes((p), 0) -static char *_rmescapes(char *, int); -static int casematch(union node *, char *); - -#ifdef CONFIG_ASH_MATH_SUPPORT -static void expari(int); -#endif - -/* eval.h */ - -static char *commandname; /* currently executing command */ -static struct strlist *cmdenviron; /* environment for builtin command */ -static int exitstatus; /* exit status of last command */ -static int back_exitstatus; /* exit status of backquoted command */ - - -struct backcmd { /* result of evalbackcmd */ - int fd; /* file descriptor to read from */ - char *buf; /* buffer */ - int nleft; /* number of chars in buffer */ - struct job *jp; /* job structure for command */ -}; +static void +ignoresig(int signo) +{ + if (sigmode[signo - 1] != S_IGN && sigmode[signo - 1] != S_HARD_IGN) { + signal(signo, SIG_IGN); + } + sigmode[signo - 1] = S_HARD_IGN; +} /* - * This file was generated by the mknodes program. + * Signal handler. Only one usage site - in setsignal() */ +static void +onsig(int signo) +{ + gotsig[signo - 1] = 1; + pendingsig = signo; -#define NCMD 0 -#define NPIPE 1 -#define NREDIR 2 -#define NBACKGND 3 -#define NSUBSHELL 4 -#define NAND 5 -#define NOR 6 -#define NSEMI 7 -#define NIF 8 -#define NWHILE 9 -#define NUNTIL 10 -#define NFOR 11 -#define NCASE 12 -#define NCLIST 13 -#define NDEFUN 14 -#define NARG 15 -#define NTO 16 -#define NCLOBBER 17 -#define NFROM 18 -#define NFROMTO 19 -#define NAPPEND 20 -#define NTOFD 21 -#define NFROMFD 22 -#define NHERE 23 -#define NXHERE 24 -#define NNOT 25 - + if (exsig || (signo == SIGINT && !trap[SIGINT])) { + if (!suppressint) { + pendingsig = 0; + raise_interrupt(); + } + intpending = 1; + } +} -struct ncmd { - int type; - union node *assign; - union node *args; - union node *redirect; -}; +/* ============ Stdout/stderr output */ +static void +outstr(const char *p, FILE *file) +{ + INT_OFF; + fputs(p, file); + INT_ON; +} -struct npipe { - int type; - int backgnd; - struct nodelist *cmdlist; -}; +static void +flush_stdout_stderr(void) +{ + INT_OFF; + fflush(stdout); + fflush(stderr); + INT_ON; +} +static void +flush_stderr(void) +{ + INT_OFF; + fflush(stderr); + INT_ON; +} -struct nredir { - int type; - union node *n; - union node *redirect; -}; +static void +outcslow(int c, FILE *dest) +{ + INT_OFF; + putc(c, dest); + fflush(dest); + INT_ON; +} +static int out1fmt(const char *, ...) __attribute__((__format__(__printf__,1,2))); +static int +out1fmt(const char *fmt, ...) +{ + va_list ap; + int r; -struct nbinary { - int type; - union node *ch1; - union node *ch2; -}; - - -struct nif { - int type; - union node *test; - union node *ifpart; - union node *elsepart; -}; - - -struct nfor { - int type; - union node *args; - union node *body; - char *var; -}; - - -struct ncase { - int type; - union node *expr; - union node *cases; -}; - - -struct nclist { - int type; - union node *next; - union node *pattern; - union node *body; -}; - - -struct narg { - int type; - union node *next; - char *text; - struct nodelist *backquote; -}; - - -struct nfile { - int type; - union node *next; - int fd; - union node *fname; - char *expfname; -}; - - -struct ndup { - int type; - union node *next; - int fd; - int dupfd; - union node *vname; -}; - - -struct nhere { - int type; - union node *next; - int fd; - union node *doc; -}; - - -struct nnot { - int type; - union node *com; -}; - - -union node { - int type; - struct ncmd ncmd; - struct npipe npipe; - struct nredir nredir; - struct nbinary nbinary; - struct nif nif; - struct nfor nfor; - struct ncase ncase; - struct nclist nclist; - struct narg narg; - struct nfile nfile; - struct ndup ndup; - struct nhere nhere; - struct nnot nnot; -}; + INT_OFF; + va_start(ap, fmt); + r = vprintf(fmt, ap); + va_end(ap); + INT_ON; + return r; +} +static int fmtstr(char *, size_t, const char *, ...) __attribute__((__format__(__printf__,3,4))); +static int +fmtstr(char *outbuf, size_t length, const char *fmt, ...) +{ + va_list ap; + int ret; -struct nodelist { - struct nodelist *next; - union node *n; -}; + va_start(ap, fmt); + INT_OFF; + ret = vsnprintf(outbuf, length, fmt, ap); + va_end(ap); + INT_ON; + return ret; +} +static void +out1str(const char *p) +{ + outstr(p, stdout); +} -struct funcnode { - int count; - union node n; -}; +static void +out2str(const char *p) +{ + outstr(p, stderr); + flush_stderr(); +} -static void freefunc(struct funcnode *); -/* parser.h */ +/* ============ Parser structures */ /* control characters in argument strings */ -#define CTL_FIRST '\201' /* first 'special' character */ #define CTLESC '\201' /* escape next character */ #define CTLVAR '\202' /* variable defn */ #define CTLENDVAR '\203' @@ -486,7 +429,6 @@ static void freefunc(struct funcnode *); #define CTLARI '\206' /* arithmetic expression */ #define CTLENDARI '\207' #define CTLQUOTEMARK '\210' -#define CTL_LAST '\210' /* last 'special' character */ /* variable substitution byte (follows CTLVAR) */ #define VSTYPE 0x0f /* type of variable substitution */ @@ -505,11850 +447,10912 @@ static void freefunc(struct funcnode *); #define VSTRIMLEFTMAX 0x9 /* ${var##pattern} */ #define VSLENGTH 0xa /* ${#var} */ -/* values of checkkwd variable */ -#define CHKALIAS 0x1 -#define CHKKWD 0x2 -#define CHKNL 0x4 - -#define IBUFSIZ (BUFSIZ + 1) - -/* - * NEOF is returned by parsecmd when it encounters an end of file. It - * must be distinct from NULL, so we use the address of a variable that - * happens to be handy. - */ -static int plinno = 1; /* input line number */ +static const char dolatstr[] ALIGN1 = { + CTLVAR, VSNORMAL|VSQUOTE, '@', '=', '\0' +}; -/* number of characters left in input buffer */ -static int parsenleft; /* copy of parsefile->nleft */ -static int parselleft; /* copy of parsefile->lleft */ +#define NCMD 0 +#define NPIPE 1 +#define NREDIR 2 +#define NBACKGND 3 +#define NSUBSHELL 4 +#define NAND 5 +#define NOR 6 +#define NSEMI 7 +#define NIF 8 +#define NWHILE 9 +#define NUNTIL 10 +#define NFOR 11 +#define NCASE 12 +#define NCLIST 13 +#define NDEFUN 14 +#define NARG 15 +#define NTO 16 +#define NCLOBBER 17 +#define NFROM 18 +#define NFROMTO 19 +#define NAPPEND 20 +#define NTOFD 21 +#define NFROMFD 22 +#define NHERE 23 +#define NXHERE 24 +#define NNOT 25 -/* next character in input buffer */ -static char *parsenextc; /* copy of parsefile->nextc */ +union node; -struct strpush { - struct strpush *prev; /* preceding string on stack */ - char *prevstring; - int prevnleft; -#ifdef CONFIG_ASH_ALIAS - struct alias *ap; /* if push was associated with an alias */ -#endif - char *string; /* remember the string since it may change */ +struct ncmd { + int type; + union node *assign; + union node *args; + union node *redirect; }; -struct parsefile { - struct parsefile *prev; /* preceding file on stack */ - int linno; /* current line */ - int fd; /* file descriptor (or -1 if string) */ - int nleft; /* number of chars left in this line */ - int lleft; /* number of chars left in this buffer */ - char *nextc; /* next char in buffer */ - char *buf; /* input buffer */ - struct strpush *strpush; /* for pushing strings at this level */ - struct strpush basestrpush; /* so pushing one is fast */ +struct npipe { + int type; + int backgnd; + struct nodelist *cmdlist; }; -static struct parsefile basepf; /* top level input file */ -#define basebuf bb_common_bufsiz1 /* buffer for top level input file */ -static struct parsefile *parsefile = &basepf; /* current input file */ +struct nredir { + int type; + union node *n; + union node *redirect; +}; +struct nbinary { + int type; + union node *ch1; + union node *ch2; +}; -static int tokpushback; /* last token pushed back */ -#define NEOF ((union node *)&tokpushback) -static int parsebackquote; /* nonzero if we are inside backquotes */ -static int doprompt; /* if set, prompt the user */ -static int needprompt; /* true if interactive and at start of line */ -static int lasttoken; /* last token read */ -static char *wordtext; /* text of last word returned by readtoken */ -static int checkkwd; -static struct nodelist *backquotelist; -static union node *redirnode; -static struct heredoc *heredoc; -static int quoteflag; /* set if (part of) last token was quoted */ -static int startlinno; /* line # where last token started */ +struct nif { + int type; + union node *test; + union node *ifpart; + union node *elsepart; +}; -static union node *parsecmd(int); -static void fixredir(union node *, const char *, int); -static const char *const *findkwd(const char *); -static char *endofname(const char *); +struct nfor { + int type; + union node *args; + union node *body; + char *var; +}; -/* shell.h */ +struct ncase { + int type; + union node *expr; + union node *cases; +}; -typedef void *pointer; +struct nclist { + int type; + union node *next; + union node *pattern; + union node *body; +}; -static char nullstr[1]; /* zero length string */ -static const char spcstr[] = " "; -static const char snlfmt[] = "%s\n"; -static const char dolatstr[] = { CTLVAR, VSNORMAL|VSQUOTE, '@', '=', '\0' }; -static const char illnum[] = "Illegal number: %s"; -static const char homestr[] = "HOME"; +struct narg { + int type; + union node *next; + char *text; + struct nodelist *backquote; +}; -#if DEBUG -#define TRACE(param) trace param -#define TRACEV(param) tracev param -#else -#define TRACE(param) -#define TRACEV(param) -#endif +struct nfile { + int type; + union node *next; + int fd; + union node *fname; + char *expfname; +}; -#if !defined(__GNUC__) || (__GNUC__ == 2 && __GNUC_MINOR__ < 96) -#define __builtin_expect(x, expected_value) (x) -#endif +struct ndup { + int type; + union node *next; + int fd; + int dupfd; + union node *vname; +}; -#define xlikely(x) __builtin_expect((x),1) +struct nhere { + int type; + union node *next; + int fd; + union node *doc; +}; +struct nnot { + int type; + union node *com; +}; -#define TEOF 0 -#define TNL 1 -#define TREDIR 2 -#define TWORD 3 -#define TSEMI 4 -#define TBACKGND 5 -#define TAND 6 -#define TOR 7 -#define TPIPE 8 -#define TLP 9 -#define TRP 10 -#define TENDCASE 11 -#define TENDBQUOTE 12 -#define TNOT 13 -#define TCASE 14 -#define TDO 15 -#define TDONE 16 -#define TELIF 17 -#define TELSE 18 -#define TESAC 19 -#define TFI 20 -#define TFOR 21 -#define TIF 22 -#define TIN 23 -#define TTHEN 24 -#define TUNTIL 25 -#define TWHILE 26 -#define TBEGIN 27 -#define TEND 28 +union node { + int type; + struct ncmd ncmd; + struct npipe npipe; + struct nredir nredir; + struct nbinary nbinary; + struct nif nif; + struct nfor nfor; + struct ncase ncase; + struct nclist nclist; + struct narg narg; + struct nfile nfile; + struct ndup ndup; + struct nhere nhere; + struct nnot nnot; +}; -/* first char is indicating which tokens mark the end of a list */ -static const char *const tokname_array[] = { - "\1end of file", - "\0newline", - "\0redirection", - "\0word", - "\0;", - "\0&", - "\0&&", - "\0||", - "\0|", - "\0(", - "\1)", - "\1;;", - "\1`", -#define KWDOFFSET 13 - /* the following are keywords */ - "\0!", - "\0case", - "\1do", - "\1done", - "\1elif", - "\1else", - "\1esac", - "\1fi", - "\0for", - "\0if", - "\0in", - "\1then", - "\0until", - "\0while", - "\0{", - "\1}", +struct nodelist { + struct nodelist *next; + union node *n; }; -static const char *tokname(int tok) -{ - static char buf[16]; +struct funcnode { + int count; + union node n; +}; - if (tok >= TSEMI) - buf[0] = '"'; - sprintf(buf + (tok >= TSEMI), "%s%c", - tokname_array[tok] + 1, (tok >= TSEMI ? '"' : 0)); - return buf; -} - -/* machdep.h */ - -/* - * Most machines require the value returned from malloc to be aligned - * in some way. The following macro will get this right on many machines. - */ - -#define SHELL_SIZE (sizeof(union {int i; char *cp; double d; }) - 1) /* - * It appears that grabstackstr() will barf with such alignments - * because stalloc() will return a string allocated in a new stackblock. + * Free a parse tree. */ -#define SHELL_ALIGN(nbytes) (((nbytes) + SHELL_SIZE) & ~SHELL_SIZE) +static void +freefunc(struct funcnode *f) +{ + if (f && --f->count < 0) + free(f); +} -/* - * This file was generated by the mksyntax program. - */ +/* ============ Debugging output */ -/* Syntax classes */ -#define CWORD 0 /* character is nothing special */ -#define CNL 1 /* newline character */ -#define CBACK 2 /* a backslash character */ -#define CSQUOTE 3 /* single quote */ -#define CDQUOTE 4 /* double quote */ -#define CENDQUOTE 5 /* a terminating quote */ -#define CBQUOTE 6 /* backwards single quote */ -#define CVAR 7 /* a dollar sign */ -#define CENDVAR 8 /* a '}' character */ -#define CLP 9 /* a left paren in arithmetic */ -#define CRP 10 /* a right paren in arithmetic */ -#define CENDFILE 11 /* end of file */ -#define CCTL 12 /* like CWORD, except it must be escaped */ -#define CSPCL 13 /* these terminate a word */ -#define CIGN 14 /* character should be ignored */ +#if DEBUG -#ifdef CONFIG_ASH_ALIAS -#define SYNBASE 130 -#define PEOF -130 -#define PEOA -129 -#define PEOA_OR_PEOF PEOA -#else -#define SYNBASE 129 -#define PEOF -129 -#define PEOA_OR_PEOF PEOF -#endif +static FILE *tracefile; -#define is_digit(c) ((unsigned)((c) - '0') <= 9) -#define is_name(c) ((c) == '_' || isalpha((unsigned char)(c))) -#define is_in_name(c) ((c) == '_' || isalnum((unsigned char)(c))) +static void +trace_printf(const char *fmt, ...) +{ + va_list va; -/* C99 say: "char" declaration may be signed or unsigned default */ -#define SC2INT(chr2may_be_negative_int) (int)((signed char)chr2may_be_negative_int) + if (debug != 1) + return; + va_start(va, fmt); + vfprintf(tracefile, fmt, va); + va_end(va); +} -/* - * is_special(c) evaluates to 1 for c in "!#$*-0123456789?@"; 0 otherwise - * (assuming ascii char codes, as the original implementation did) - */ -#define is_special(c) \ - ( (((unsigned int)c) - 33 < 32) \ - && ((0xc1ff920dUL >> (((unsigned int)c) - 33)) & 1)) +static void +trace_vprintf(const char *fmt, va_list va) +{ + if (debug != 1) + return; + vfprintf(tracefile, fmt, va); +} -#define digit_val(c) ((c) - '0') +static void +trace_puts(const char *s) +{ + if (debug != 1) + return; + fputs(s, tracefile); +} -/* - * This file was generated by the mksyntax program. - */ +static void +trace_puts_quoted(char *s) +{ + char *p; + char c; -#ifdef CONFIG_ASH_OPTIMIZE_FOR_SIZE -#define USE_SIT_FUNCTION -#endif + if (debug != 1) + return; + putc('"', tracefile); + for (p = s; *p; p++) { + switch (*p) { + case '\n': c = 'n'; goto backslash; + case '\t': c = 't'; goto backslash; + case '\r': c = 'r'; goto backslash; + case '"': c = '"'; goto backslash; + case '\\': c = '\\'; goto backslash; + case CTLESC: c = 'e'; goto backslash; + case CTLVAR: c = 'v'; goto backslash; + case CTLVAR+CTLQUOTE: c = 'V'; goto backslash; + case CTLBACKQ: c = 'q'; goto backslash; + case CTLBACKQ+CTLQUOTE: c = 'Q'; goto backslash; + backslash: + putc('\\', tracefile); + putc(c, tracefile); + break; + default: + if (*p >= ' ' && *p <= '~') + putc(*p, tracefile); + else { + putc('\\', tracefile); + putc(*p >> 6 & 03, tracefile); + putc(*p >> 3 & 07, tracefile); + putc(*p & 07, tracefile); + } + break; + } + } + putc('"', tracefile); +} -/* number syntax index */ -#define BASESYNTAX 0 /* not in quotes */ -#define DQSYNTAX 1 /* in double quotes */ -#define SQSYNTAX 2 /* in single quotes */ -#define ARISYNTAX 3 /* in arithmetic */ +static void +trace_puts_args(char **ap) +{ + if (debug != 1) + return; + if (!*ap) + return; + while (1) { + trace_puts_quoted(*ap); + if (!*++ap) { + putc('\n', tracefile); + break; + } + putc(' ', tracefile); + } +} -#ifdef CONFIG_ASH_MATH_SUPPORT -static const char S_I_T[][4] = { -#ifdef CONFIG_ASH_ALIAS - {CSPCL, CIGN, CIGN, CIGN}, /* 0, PEOA */ -#endif - {CSPCL, CWORD, CWORD, CWORD}, /* 1, ' ' */ - {CNL, CNL, CNL, CNL}, /* 2, \n */ - {CWORD, CCTL, CCTL, CWORD}, /* 3, !*-/:=?[]~ */ - {CDQUOTE, CENDQUOTE, CWORD, CWORD}, /* 4, '"' */ - {CVAR, CVAR, CWORD, CVAR}, /* 5, $ */ - {CSQUOTE, CWORD, CENDQUOTE, CWORD}, /* 6, "'" */ - {CSPCL, CWORD, CWORD, CLP}, /* 7, ( */ - {CSPCL, CWORD, CWORD, CRP}, /* 8, ) */ - {CBACK, CBACK, CCTL, CBACK}, /* 9, \ */ - {CBQUOTE, CBQUOTE, CWORD, CBQUOTE}, /* 10, ` */ - {CENDVAR, CENDVAR, CWORD, CENDVAR}, /* 11, } */ -#ifndef USE_SIT_FUNCTION - {CENDFILE, CENDFILE, CENDFILE, CENDFILE}, /* 12, PEOF */ - {CWORD, CWORD, CWORD, CWORD}, /* 13, 0-9A-Za-z */ - {CCTL, CCTL, CCTL, CCTL} /* 14, CTLESC ... */ +static void +opentrace(void) +{ + char s[100]; +#ifdef O_APPEND + int flags; #endif -}; -#else -static const char S_I_T[][3] = { -#ifdef CONFIG_ASH_ALIAS - {CSPCL, CIGN, CIGN}, /* 0, PEOA */ -#endif - {CSPCL, CWORD, CWORD}, /* 1, ' ' */ - {CNL, CNL, CNL}, /* 2, \n */ - {CWORD, CCTL, CCTL}, /* 3, !*-/:=?[]~ */ - {CDQUOTE, CENDQUOTE, CWORD}, /* 4, '"' */ - {CVAR, CVAR, CWORD}, /* 5, $ */ - {CSQUOTE, CWORD, CENDQUOTE}, /* 6, "'" */ - {CSPCL, CWORD, CWORD}, /* 7, ( */ - {CSPCL, CWORD, CWORD}, /* 8, ) */ - {CBACK, CBACK, CCTL}, /* 9, \ */ - {CBQUOTE, CBQUOTE, CWORD}, /* 10, ` */ - {CENDVAR, CENDVAR, CWORD}, /* 11, } */ -#ifndef USE_SIT_FUNCTION - {CENDFILE, CENDFILE, CENDFILE}, /* 12, PEOF */ - {CWORD, CWORD, CWORD}, /* 13, 0-9A-Za-z */ - {CCTL, CCTL, CCTL} /* 14, CTLESC ... */ + + if (debug != 1) { + if (tracefile) + fflush(tracefile); + /* leave open because libedit might be using it */ + return; + } + strcpy(s, "./trace"); + if (tracefile) { + if (!freopen(s, "a", tracefile)) { + fprintf(stderr, "Can't re-open %s\n", s); + debug = 0; + return; + } + } else { + tracefile = fopen(s, "a"); + if (tracefile == NULL) { + fprintf(stderr, "Can't open %s\n", s); + debug = 0; + return; + } + } +#ifdef O_APPEND + flags = fcntl(fileno(tracefile), F_GETFL); + if (flags >= 0) + fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND); #endif -}; -#endif /* CONFIG_ASH_MATH_SUPPORT */ + setlinebuf(tracefile); + fputs("\nTracing started.\n", tracefile); +} -#ifdef USE_SIT_FUNCTION +static void +indent(int amount, char *pfx, FILE *fp) +{ + int i; -#define U_C(c) ((unsigned char)(c)) + for (i = 0; i < amount; i++) { + if (pfx && i == amount - 1) + fputs(pfx, fp); + putc('\t', fp); + } +} -static int SIT(int c, int syntax) +/* little circular references here... */ +static void shtree(union node *n, int ind, char *pfx, FILE *fp); + +static void +sharg(union node *arg, FILE *fp) { - static const char spec_symbls[] = "\t\n !\"$&'()*-/:;<=>?[\\]`|}~"; -#ifdef CONFIG_ASH_ALIAS - static const char syntax_index_table[] = { - 1, 2, 1, 3, 4, 5, 1, 6, /* "\t\n !\"$&'" */ - 7, 8, 3, 3, 3, 3, 1, 1, /* "()*-/:;<" */ - 3, 1, 3, 3, 9, 3, 10, 1, /* "=>?[\\]`|" */ - 11, 3 /* "}~" */ - }; -#else - static const char syntax_index_table[] = { - 0, 1, 0, 2, 3, 4, 0, 5, /* "\t\n !\"$&'" */ - 6, 7, 2, 2, 2, 2, 0, 0, /* "()*-/:;<" */ - 2, 0, 2, 2, 8, 2, 9, 0, /* "=>?[\\]`|" */ - 10, 2 /* "}~" */ - }; -#endif - const char *s; - int indx; + char *p; + struct nodelist *bqlist; + int subtype; - if (c == PEOF) /* 2^8+2 */ - return CENDFILE; -#ifdef CONFIG_ASH_ALIAS - if (c == PEOA) /* 2^8+1 */ - indx = 0; - else -#endif - if (U_C(c) >= U_C(CTLESC) && U_C(c) <= U_C(CTLQUOTEMARK)) - return CCTL; - else { - s = strchr(spec_symbls, c); - if (s == 0 || *s == 0) - return CWORD; - indx = syntax_index_table[(s - spec_symbls)]; + if (arg->type != NARG) { + out1fmt("\n", arg->type); + abort(); } - return S_I_T[indx][syntax]; -} + bqlist = arg->narg.backquote; + for (p = arg->narg.text; *p; p++) { + switch (*p) { + case CTLESC: + putc(*++p, fp); + break; + case CTLVAR: + putc('$', fp); + putc('{', fp); + subtype = *++p; + if (subtype == VSLENGTH) + putc('#', fp); -#else /* USE_SIT_FUNCTION */ - -#define SIT(c, syntax) S_I_T[(int)syntax_index_table[((int)c)+SYNBASE]][syntax] - -#ifdef CONFIG_ASH_ALIAS -#define CSPCL_CIGN_CIGN_CIGN 0 -#define CSPCL_CWORD_CWORD_CWORD 1 -#define CNL_CNL_CNL_CNL 2 -#define CWORD_CCTL_CCTL_CWORD 3 -#define CDQUOTE_CENDQUOTE_CWORD_CWORD 4 -#define CVAR_CVAR_CWORD_CVAR 5 -#define CSQUOTE_CWORD_CENDQUOTE_CWORD 6 -#define CSPCL_CWORD_CWORD_CLP 7 -#define CSPCL_CWORD_CWORD_CRP 8 -#define CBACK_CBACK_CCTL_CBACK 9 -#define CBQUOTE_CBQUOTE_CWORD_CBQUOTE 10 -#define CENDVAR_CENDVAR_CWORD_CENDVAR 11 -#define CENDFILE_CENDFILE_CENDFILE_CENDFILE 12 -#define CWORD_CWORD_CWORD_CWORD 13 -#define CCTL_CCTL_CCTL_CCTL 14 -#else -#define CSPCL_CWORD_CWORD_CWORD 0 -#define CNL_CNL_CNL_CNL 1 -#define CWORD_CCTL_CCTL_CWORD 2 -#define CDQUOTE_CENDQUOTE_CWORD_CWORD 3 -#define CVAR_CVAR_CWORD_CVAR 4 -#define CSQUOTE_CWORD_CENDQUOTE_CWORD 5 -#define CSPCL_CWORD_CWORD_CLP 6 -#define CSPCL_CWORD_CWORD_CRP 7 -#define CBACK_CBACK_CCTL_CBACK 8 -#define CBQUOTE_CBQUOTE_CWORD_CBQUOTE 9 -#define CENDVAR_CENDVAR_CWORD_CENDVAR 10 -#define CENDFILE_CENDFILE_CENDFILE_CENDFILE 11 -#define CWORD_CWORD_CWORD_CWORD 12 -#define CCTL_CCTL_CCTL_CCTL 13 -#endif - -static const char syntax_index_table[258] = { - /* BASESYNTAX_DQSYNTAX_SQSYNTAX_ARISYNTAX */ - /* 0 PEOF */ CENDFILE_CENDFILE_CENDFILE_CENDFILE, -#ifdef CONFIG_ASH_ALIAS - /* 1 PEOA */ CSPCL_CIGN_CIGN_CIGN, -#endif - /* 2 -128 0x80 */ CWORD_CWORD_CWORD_CWORD, - /* 3 -127 CTLESC */ CCTL_CCTL_CCTL_CCTL, - /* 4 -126 CTLVAR */ CCTL_CCTL_CCTL_CCTL, - /* 5 -125 CTLENDVAR */ CCTL_CCTL_CCTL_CCTL, - /* 6 -124 CTLBACKQ */ CCTL_CCTL_CCTL_CCTL, - /* 7 -123 CTLQUOTE */ CCTL_CCTL_CCTL_CCTL, - /* 8 -122 CTLARI */ CCTL_CCTL_CCTL_CCTL, - /* 9 -121 CTLENDARI */ CCTL_CCTL_CCTL_CCTL, - /* 10 -120 CTLQUOTEMARK */ CCTL_CCTL_CCTL_CCTL, - /* 11 -119 */ CWORD_CWORD_CWORD_CWORD, - /* 12 -118 */ CWORD_CWORD_CWORD_CWORD, - /* 13 -117 */ CWORD_CWORD_CWORD_CWORD, - /* 14 -116 */ CWORD_CWORD_CWORD_CWORD, - /* 15 -115 */ CWORD_CWORD_CWORD_CWORD, - /* 16 -114 */ CWORD_CWORD_CWORD_CWORD, - /* 17 -113 */ CWORD_CWORD_CWORD_CWORD, - /* 18 -112 */ CWORD_CWORD_CWORD_CWORD, - /* 19 -111 */ CWORD_CWORD_CWORD_CWORD, - /* 20 -110 */ CWORD_CWORD_CWORD_CWORD, - /* 21 -109 */ CWORD_CWORD_CWORD_CWORD, - /* 22 -108 */ CWORD_CWORD_CWORD_CWORD, - /* 23 -107 */ CWORD_CWORD_CWORD_CWORD, - /* 24 -106 */ CWORD_CWORD_CWORD_CWORD, - /* 25 -105 */ CWORD_CWORD_CWORD_CWORD, - /* 26 -104 */ CWORD_CWORD_CWORD_CWORD, - /* 27 -103 */ CWORD_CWORD_CWORD_CWORD, - /* 28 -102 */ CWORD_CWORD_CWORD_CWORD, - /* 29 -101 */ CWORD_CWORD_CWORD_CWORD, - /* 30 -100 */ CWORD_CWORD_CWORD_CWORD, - /* 31 -99 */ CWORD_CWORD_CWORD_CWORD, - /* 32 -98 */ CWORD_CWORD_CWORD_CWORD, - /* 33 -97 */ CWORD_CWORD_CWORD_CWORD, - /* 34 -96 */ CWORD_CWORD_CWORD_CWORD, - /* 35 -95 */ CWORD_CWORD_CWORD_CWORD, - /* 36 -94 */ CWORD_CWORD_CWORD_CWORD, - /* 37 -93 */ CWORD_CWORD_CWORD_CWORD, - /* 38 -92 */ CWORD_CWORD_CWORD_CWORD, - /* 39 -91 */ CWORD_CWORD_CWORD_CWORD, - /* 40 -90 */ CWORD_CWORD_CWORD_CWORD, - /* 41 -89 */ CWORD_CWORD_CWORD_CWORD, - /* 42 -88 */ CWORD_CWORD_CWORD_CWORD, - /* 43 -87 */ CWORD_CWORD_CWORD_CWORD, - /* 44 -86 */ CWORD_CWORD_CWORD_CWORD, - /* 45 -85 */ CWORD_CWORD_CWORD_CWORD, - /* 46 -84 */ CWORD_CWORD_CWORD_CWORD, - /* 47 -83 */ CWORD_CWORD_CWORD_CWORD, - /* 48 -82 */ CWORD_CWORD_CWORD_CWORD, - /* 49 -81 */ CWORD_CWORD_CWORD_CWORD, - /* 50 -80 */ CWORD_CWORD_CWORD_CWORD, - /* 51 -79 */ CWORD_CWORD_CWORD_CWORD, - /* 52 -78 */ CWORD_CWORD_CWORD_CWORD, - /* 53 -77 */ CWORD_CWORD_CWORD_CWORD, - /* 54 -76 */ CWORD_CWORD_CWORD_CWORD, - /* 55 -75 */ CWORD_CWORD_CWORD_CWORD, - /* 56 -74 */ CWORD_CWORD_CWORD_CWORD, - /* 57 -73 */ CWORD_CWORD_CWORD_CWORD, - /* 58 -72 */ CWORD_CWORD_CWORD_CWORD, - /* 59 -71 */ CWORD_CWORD_CWORD_CWORD, - /* 60 -70 */ CWORD_CWORD_CWORD_CWORD, - /* 61 -69 */ CWORD_CWORD_CWORD_CWORD, - /* 62 -68 */ CWORD_CWORD_CWORD_CWORD, - /* 63 -67 */ CWORD_CWORD_CWORD_CWORD, - /* 64 -66 */ CWORD_CWORD_CWORD_CWORD, - /* 65 -65 */ CWORD_CWORD_CWORD_CWORD, - /* 66 -64 */ CWORD_CWORD_CWORD_CWORD, - /* 67 -63 */ CWORD_CWORD_CWORD_CWORD, - /* 68 -62 */ CWORD_CWORD_CWORD_CWORD, - /* 69 -61 */ CWORD_CWORD_CWORD_CWORD, - /* 70 -60 */ CWORD_CWORD_CWORD_CWORD, - /* 71 -59 */ CWORD_CWORD_CWORD_CWORD, - /* 72 -58 */ CWORD_CWORD_CWORD_CWORD, - /* 73 -57 */ CWORD_CWORD_CWORD_CWORD, - /* 74 -56 */ CWORD_CWORD_CWORD_CWORD, - /* 75 -55 */ CWORD_CWORD_CWORD_CWORD, - /* 76 -54 */ CWORD_CWORD_CWORD_CWORD, - /* 77 -53 */ CWORD_CWORD_CWORD_CWORD, - /* 78 -52 */ CWORD_CWORD_CWORD_CWORD, - /* 79 -51 */ CWORD_CWORD_CWORD_CWORD, - /* 80 -50 */ CWORD_CWORD_CWORD_CWORD, - /* 81 -49 */ CWORD_CWORD_CWORD_CWORD, - /* 82 -48 */ CWORD_CWORD_CWORD_CWORD, - /* 83 -47 */ CWORD_CWORD_CWORD_CWORD, - /* 84 -46 */ CWORD_CWORD_CWORD_CWORD, - /* 85 -45 */ CWORD_CWORD_CWORD_CWORD, - /* 86 -44 */ CWORD_CWORD_CWORD_CWORD, - /* 87 -43 */ CWORD_CWORD_CWORD_CWORD, - /* 88 -42 */ CWORD_CWORD_CWORD_CWORD, - /* 89 -41 */ CWORD_CWORD_CWORD_CWORD, - /* 90 -40 */ CWORD_CWORD_CWORD_CWORD, - /* 91 -39 */ CWORD_CWORD_CWORD_CWORD, - /* 92 -38 */ CWORD_CWORD_CWORD_CWORD, - /* 93 -37 */ CWORD_CWORD_CWORD_CWORD, - /* 94 -36 */ CWORD_CWORD_CWORD_CWORD, - /* 95 -35 */ CWORD_CWORD_CWORD_CWORD, - /* 96 -34 */ CWORD_CWORD_CWORD_CWORD, - /* 97 -33 */ CWORD_CWORD_CWORD_CWORD, - /* 98 -32 */ CWORD_CWORD_CWORD_CWORD, - /* 99 -31 */ CWORD_CWORD_CWORD_CWORD, - /* 100 -30 */ CWORD_CWORD_CWORD_CWORD, - /* 101 -29 */ CWORD_CWORD_CWORD_CWORD, - /* 102 -28 */ CWORD_CWORD_CWORD_CWORD, - /* 103 -27 */ CWORD_CWORD_CWORD_CWORD, - /* 104 -26 */ CWORD_CWORD_CWORD_CWORD, - /* 105 -25 */ CWORD_CWORD_CWORD_CWORD, - /* 106 -24 */ CWORD_CWORD_CWORD_CWORD, - /* 107 -23 */ CWORD_CWORD_CWORD_CWORD, - /* 108 -22 */ CWORD_CWORD_CWORD_CWORD, - /* 109 -21 */ CWORD_CWORD_CWORD_CWORD, - /* 110 -20 */ CWORD_CWORD_CWORD_CWORD, - /* 111 -19 */ CWORD_CWORD_CWORD_CWORD, - /* 112 -18 */ CWORD_CWORD_CWORD_CWORD, - /* 113 -17 */ CWORD_CWORD_CWORD_CWORD, - /* 114 -16 */ CWORD_CWORD_CWORD_CWORD, - /* 115 -15 */ CWORD_CWORD_CWORD_CWORD, - /* 116 -14 */ CWORD_CWORD_CWORD_CWORD, - /* 117 -13 */ CWORD_CWORD_CWORD_CWORD, - /* 118 -12 */ CWORD_CWORD_CWORD_CWORD, - /* 119 -11 */ CWORD_CWORD_CWORD_CWORD, - /* 120 -10 */ CWORD_CWORD_CWORD_CWORD, - /* 121 -9 */ CWORD_CWORD_CWORD_CWORD, - /* 122 -8 */ CWORD_CWORD_CWORD_CWORD, - /* 123 -7 */ CWORD_CWORD_CWORD_CWORD, - /* 124 -6 */ CWORD_CWORD_CWORD_CWORD, - /* 125 -5 */ CWORD_CWORD_CWORD_CWORD, - /* 126 -4 */ CWORD_CWORD_CWORD_CWORD, - /* 127 -3 */ CWORD_CWORD_CWORD_CWORD, - /* 128 -2 */ CWORD_CWORD_CWORD_CWORD, - /* 129 -1 */ CWORD_CWORD_CWORD_CWORD, - /* 130 0 */ CWORD_CWORD_CWORD_CWORD, - /* 131 1 */ CWORD_CWORD_CWORD_CWORD, - /* 132 2 */ CWORD_CWORD_CWORD_CWORD, - /* 133 3 */ CWORD_CWORD_CWORD_CWORD, - /* 134 4 */ CWORD_CWORD_CWORD_CWORD, - /* 135 5 */ CWORD_CWORD_CWORD_CWORD, - /* 136 6 */ CWORD_CWORD_CWORD_CWORD, - /* 137 7 */ CWORD_CWORD_CWORD_CWORD, - /* 138 8 */ CWORD_CWORD_CWORD_CWORD, - /* 139 9 "\t" */ CSPCL_CWORD_CWORD_CWORD, - /* 140 10 "\n" */ CNL_CNL_CNL_CNL, - /* 141 11 */ CWORD_CWORD_CWORD_CWORD, - /* 142 12 */ CWORD_CWORD_CWORD_CWORD, - /* 143 13 */ CWORD_CWORD_CWORD_CWORD, - /* 144 14 */ CWORD_CWORD_CWORD_CWORD, - /* 145 15 */ CWORD_CWORD_CWORD_CWORD, - /* 146 16 */ CWORD_CWORD_CWORD_CWORD, - /* 147 17 */ CWORD_CWORD_CWORD_CWORD, - /* 148 18 */ CWORD_CWORD_CWORD_CWORD, - /* 149 19 */ CWORD_CWORD_CWORD_CWORD, - /* 150 20 */ CWORD_CWORD_CWORD_CWORD, - /* 151 21 */ CWORD_CWORD_CWORD_CWORD, - /* 152 22 */ CWORD_CWORD_CWORD_CWORD, - /* 153 23 */ CWORD_CWORD_CWORD_CWORD, - /* 154 24 */ CWORD_CWORD_CWORD_CWORD, - /* 155 25 */ CWORD_CWORD_CWORD_CWORD, - /* 156 26 */ CWORD_CWORD_CWORD_CWORD, - /* 157 27 */ CWORD_CWORD_CWORD_CWORD, - /* 158 28 */ CWORD_CWORD_CWORD_CWORD, - /* 159 29 */ CWORD_CWORD_CWORD_CWORD, - /* 160 30 */ CWORD_CWORD_CWORD_CWORD, - /* 161 31 */ CWORD_CWORD_CWORD_CWORD, - /* 162 32 " " */ CSPCL_CWORD_CWORD_CWORD, - /* 163 33 "!" */ CWORD_CCTL_CCTL_CWORD, - /* 164 34 """ */ CDQUOTE_CENDQUOTE_CWORD_CWORD, - /* 165 35 "#" */ CWORD_CWORD_CWORD_CWORD, - /* 166 36 "$" */ CVAR_CVAR_CWORD_CVAR, - /* 167 37 "%" */ CWORD_CWORD_CWORD_CWORD, - /* 168 38 "&" */ CSPCL_CWORD_CWORD_CWORD, - /* 169 39 "'" */ CSQUOTE_CWORD_CENDQUOTE_CWORD, - /* 170 40 "(" */ CSPCL_CWORD_CWORD_CLP, - /* 171 41 ")" */ CSPCL_CWORD_CWORD_CRP, - /* 172 42 "*" */ CWORD_CCTL_CCTL_CWORD, - /* 173 43 "+" */ CWORD_CWORD_CWORD_CWORD, - /* 174 44 "," */ CWORD_CWORD_CWORD_CWORD, - /* 175 45 "-" */ CWORD_CCTL_CCTL_CWORD, - /* 176 46 "." */ CWORD_CWORD_CWORD_CWORD, - /* 177 47 "/" */ CWORD_CCTL_CCTL_CWORD, - /* 178 48 "0" */ CWORD_CWORD_CWORD_CWORD, - /* 179 49 "1" */ CWORD_CWORD_CWORD_CWORD, - /* 180 50 "2" */ CWORD_CWORD_CWORD_CWORD, - /* 181 51 "3" */ CWORD_CWORD_CWORD_CWORD, - /* 182 52 "4" */ CWORD_CWORD_CWORD_CWORD, - /* 183 53 "5" */ CWORD_CWORD_CWORD_CWORD, - /* 184 54 "6" */ CWORD_CWORD_CWORD_CWORD, - /* 185 55 "7" */ CWORD_CWORD_CWORD_CWORD, - /* 186 56 "8" */ CWORD_CWORD_CWORD_CWORD, - /* 187 57 "9" */ CWORD_CWORD_CWORD_CWORD, - /* 188 58 ":" */ CWORD_CCTL_CCTL_CWORD, - /* 189 59 ";" */ CSPCL_CWORD_CWORD_CWORD, - /* 190 60 "<" */ CSPCL_CWORD_CWORD_CWORD, - /* 191 61 "=" */ CWORD_CCTL_CCTL_CWORD, - /* 192 62 ">" */ CSPCL_CWORD_CWORD_CWORD, - /* 193 63 "?" */ CWORD_CCTL_CCTL_CWORD, - /* 194 64 "@" */ CWORD_CWORD_CWORD_CWORD, - /* 195 65 "A" */ CWORD_CWORD_CWORD_CWORD, - /* 196 66 "B" */ CWORD_CWORD_CWORD_CWORD, - /* 197 67 "C" */ CWORD_CWORD_CWORD_CWORD, - /* 198 68 "D" */ CWORD_CWORD_CWORD_CWORD, - /* 199 69 "E" */ CWORD_CWORD_CWORD_CWORD, - /* 200 70 "F" */ CWORD_CWORD_CWORD_CWORD, - /* 201 71 "G" */ CWORD_CWORD_CWORD_CWORD, - /* 202 72 "H" */ CWORD_CWORD_CWORD_CWORD, - /* 203 73 "I" */ CWORD_CWORD_CWORD_CWORD, - /* 204 74 "J" */ CWORD_CWORD_CWORD_CWORD, - /* 205 75 "K" */ CWORD_CWORD_CWORD_CWORD, - /* 206 76 "L" */ CWORD_CWORD_CWORD_CWORD, - /* 207 77 "M" */ CWORD_CWORD_CWORD_CWORD, - /* 208 78 "N" */ CWORD_CWORD_CWORD_CWORD, - /* 209 79 "O" */ CWORD_CWORD_CWORD_CWORD, - /* 210 80 "P" */ CWORD_CWORD_CWORD_CWORD, - /* 211 81 "Q" */ CWORD_CWORD_CWORD_CWORD, - /* 212 82 "R" */ CWORD_CWORD_CWORD_CWORD, - /* 213 83 "S" */ CWORD_CWORD_CWORD_CWORD, - /* 214 84 "T" */ CWORD_CWORD_CWORD_CWORD, - /* 215 85 "U" */ CWORD_CWORD_CWORD_CWORD, - /* 216 86 "V" */ CWORD_CWORD_CWORD_CWORD, - /* 217 87 "W" */ CWORD_CWORD_CWORD_CWORD, - /* 218 88 "X" */ CWORD_CWORD_CWORD_CWORD, - /* 219 89 "Y" */ CWORD_CWORD_CWORD_CWORD, - /* 220 90 "Z" */ CWORD_CWORD_CWORD_CWORD, - /* 221 91 "[" */ CWORD_CCTL_CCTL_CWORD, - /* 222 92 "\" */ CBACK_CBACK_CCTL_CBACK, - /* 223 93 "]" */ CWORD_CCTL_CCTL_CWORD, - /* 224 94 "^" */ CWORD_CWORD_CWORD_CWORD, - /* 225 95 "_" */ CWORD_CWORD_CWORD_CWORD, - /* 226 96 "`" */ CBQUOTE_CBQUOTE_CWORD_CBQUOTE, - /* 227 97 "a" */ CWORD_CWORD_CWORD_CWORD, - /* 228 98 "b" */ CWORD_CWORD_CWORD_CWORD, - /* 229 99 "c" */ CWORD_CWORD_CWORD_CWORD, - /* 230 100 "d" */ CWORD_CWORD_CWORD_CWORD, - /* 231 101 "e" */ CWORD_CWORD_CWORD_CWORD, - /* 232 102 "f" */ CWORD_CWORD_CWORD_CWORD, - /* 233 103 "g" */ CWORD_CWORD_CWORD_CWORD, - /* 234 104 "h" */ CWORD_CWORD_CWORD_CWORD, - /* 235 105 "i" */ CWORD_CWORD_CWORD_CWORD, - /* 236 106 "j" */ CWORD_CWORD_CWORD_CWORD, - /* 237 107 "k" */ CWORD_CWORD_CWORD_CWORD, - /* 238 108 "l" */ CWORD_CWORD_CWORD_CWORD, - /* 239 109 "m" */ CWORD_CWORD_CWORD_CWORD, - /* 240 110 "n" */ CWORD_CWORD_CWORD_CWORD, - /* 241 111 "o" */ CWORD_CWORD_CWORD_CWORD, - /* 242 112 "p" */ CWORD_CWORD_CWORD_CWORD, - /* 243 113 "q" */ CWORD_CWORD_CWORD_CWORD, - /* 244 114 "r" */ CWORD_CWORD_CWORD_CWORD, - /* 245 115 "s" */ CWORD_CWORD_CWORD_CWORD, - /* 246 116 "t" */ CWORD_CWORD_CWORD_CWORD, - /* 247 117 "u" */ CWORD_CWORD_CWORD_CWORD, - /* 248 118 "v" */ CWORD_CWORD_CWORD_CWORD, - /* 249 119 "w" */ CWORD_CWORD_CWORD_CWORD, - /* 250 120 "x" */ CWORD_CWORD_CWORD_CWORD, - /* 251 121 "y" */ CWORD_CWORD_CWORD_CWORD, - /* 252 122 "z" */ CWORD_CWORD_CWORD_CWORD, - /* 253 123 "{" */ CWORD_CWORD_CWORD_CWORD, - /* 254 124 "|" */ CSPCL_CWORD_CWORD_CWORD, - /* 255 125 "}" */ CENDVAR_CENDVAR_CWORD_CENDVAR, - /* 256 126 "~" */ CWORD_CCTL_CCTL_CWORD, - /* 257 127 */ CWORD_CWORD_CWORD_CWORD, -}; - -#endif /* USE_SIT_FUNCTION */ - -/* alias.c */ - - -#define ATABSIZE 39 - -static int funcblocksize; /* size of structures in function */ -static int funcstringsize; /* size of strings in node */ -static pointer funcblock; /* block to allocate function from */ -static char *funcstring; /* block to allocate strings from */ - -static const short nodesize[26] = { - SHELL_ALIGN(sizeof (struct ncmd)), - SHELL_ALIGN(sizeof (struct npipe)), - SHELL_ALIGN(sizeof (struct nredir)), - SHELL_ALIGN(sizeof (struct nredir)), - SHELL_ALIGN(sizeof (struct nredir)), - SHELL_ALIGN(sizeof (struct nbinary)), - SHELL_ALIGN(sizeof (struct nbinary)), - SHELL_ALIGN(sizeof (struct nbinary)), - SHELL_ALIGN(sizeof (struct nif)), - SHELL_ALIGN(sizeof (struct nbinary)), - SHELL_ALIGN(sizeof (struct nbinary)), - SHELL_ALIGN(sizeof (struct nfor)), - SHELL_ALIGN(sizeof (struct ncase)), - SHELL_ALIGN(sizeof (struct nclist)), - SHELL_ALIGN(sizeof (struct narg)), - SHELL_ALIGN(sizeof (struct narg)), - SHELL_ALIGN(sizeof (struct nfile)), - SHELL_ALIGN(sizeof (struct nfile)), - SHELL_ALIGN(sizeof (struct nfile)), - SHELL_ALIGN(sizeof (struct nfile)), - SHELL_ALIGN(sizeof (struct nfile)), - SHELL_ALIGN(sizeof (struct ndup)), - SHELL_ALIGN(sizeof (struct ndup)), - SHELL_ALIGN(sizeof (struct nhere)), - SHELL_ALIGN(sizeof (struct nhere)), - SHELL_ALIGN(sizeof (struct nnot)), -}; - - -static void calcsize(union node *); -static void sizenodelist(struct nodelist *); -static union node *copynode(union node *); -static struct nodelist *copynodelist(struct nodelist *); -static char *nodesavestr(char *); - - -static int evalstring(char *, int mask); -union node; /* BLETCH for ansi C */ -static void evaltree(union node *, int); -static void evalbackcmd(union node *, struct backcmd *); - -static int evalskip; /* set if we are skipping commands */ -static int skipcount; /* number of levels to skip */ -static int funcnest; /* depth of function calls */ - -/* reasons for skipping commands (see comment on breakcmd routine) */ -#define SKIPBREAK (1 << 0) -#define SKIPCONT (1 << 1) -#define SKIPFUNC (1 << 2) -#define SKIPFILE (1 << 3) -#define SKIPEVAL (1 << 4) - -/* - * This file was generated by the mkbuiltins program. - */ - -#if JOBS -static int bgcmd(int, char **); -#endif -static int breakcmd(int, char **); -static int cdcmd(int, char **); -#ifdef CONFIG_ASH_CMDCMD -static int commandcmd(int, char **); -#endif -static int dotcmd(int, char **); -static int evalcmd(int, char **); -#ifdef CONFIG_ASH_BUILTIN_ECHO -static int echocmd(int, char **); -#endif -#ifdef CONFIG_ASH_BUILTIN_TEST -static int testcmd(int, char **); -#endif -static int execcmd(int, char **); -static int exitcmd(int, char **); -static int exportcmd(int, char **); -static int falsecmd(int, char **); -#if JOBS -static int fgcmd(int, char **); -#endif -#ifdef CONFIG_ASH_GETOPTS -static int getoptscmd(int, char **); -#endif -static int hashcmd(int, char **); -#ifndef CONFIG_FEATURE_SH_EXTRA_QUIET -static int helpcmd(int argc, char **argv); -#endif -#if JOBS -static int jobscmd(int, char **); -#endif -#ifdef CONFIG_ASH_MATH_SUPPORT -static int letcmd(int, char **); -#endif -static int localcmd(int, char **); -static int pwdcmd(int, char **); -static int readcmd(int, char **); -static int returncmd(int, char **); -static int setcmd(int, char **); -static int shiftcmd(int, char **); -static int timescmd(int, char **); -static int trapcmd(int, char **); -static int truecmd(int, char **); -static int typecmd(int, char **); -static int umaskcmd(int, char **); -static int unsetcmd(int, char **); -static int waitcmd(int, char **); -static int ulimitcmd(int, char **); -#if JOBS -static int killcmd(int, char **); -#endif - -/* mail.h */ - -#ifdef CONFIG_ASH_MAIL -static void chkmail(void); -static void changemail(const char *); -#endif - -/* exec.h */ - -/* values of cmdtype */ -#define CMDUNKNOWN -1 /* no entry in table for command */ -#define CMDNORMAL 0 /* command is an executable program */ -#define CMDFUNCTION 1 /* command is a shell function */ -#define CMDBUILTIN 2 /* command is a shell builtin */ - -struct builtincmd { - const char *name; - int (*builtin)(int, char **); - /* unsigned flags; */ -}; - - -#define COMMANDCMD (builtincmd + 5 + \ - 2 * ENABLE_ASH_BUILTIN_TEST + \ - ENABLE_ASH_ALIAS + \ - ENABLE_ASH_JOB_CONTROL) -#define EXECCMD (builtincmd + 7 + \ - 2 * ENABLE_ASH_BUILTIN_TEST + \ - ENABLE_ASH_ALIAS + \ - ENABLE_ASH_JOB_CONTROL + \ - ENABLE_ASH_CMDCMD + \ - ENABLE_ASH_BUILTIN_ECHO) - -#define BUILTIN_NOSPEC "0" -#define BUILTIN_SPECIAL "1" -#define BUILTIN_REGULAR "2" -#define BUILTIN_SPEC_REG "3" -#define BUILTIN_ASSIGN "4" -#define BUILTIN_SPEC_ASSG "5" -#define BUILTIN_REG_ASSG "6" -#define BUILTIN_SPEC_REG_ASSG "7" - -#define IS_BUILTIN_SPECIAL(builtincmd) ((builtincmd)->name[0] & 1) -#define IS_BUILTIN_REGULAR(builtincmd) ((builtincmd)->name[0] & 2) -#define IS_BUILTIN_ASSIGN(builtincmd) ((builtincmd)->name[0] & 4) - -/* make sure to keep these in proper order since it is searched via bsearch() */ -static const struct builtincmd builtincmd[] = { - { BUILTIN_SPEC_REG ".", dotcmd }, - { BUILTIN_SPEC_REG ":", truecmd }, -#ifdef CONFIG_ASH_BUILTIN_TEST - { BUILTIN_REGULAR "[", testcmd }, - { BUILTIN_REGULAR "[[", testcmd }, -#endif -#ifdef CONFIG_ASH_ALIAS - { BUILTIN_REG_ASSG "alias", aliascmd }, -#endif -#if JOBS - { BUILTIN_REGULAR "bg", bgcmd }, -#endif - { BUILTIN_SPEC_REG "break", breakcmd }, - { BUILTIN_REGULAR "cd", cdcmd }, - { BUILTIN_NOSPEC "chdir", cdcmd }, -#ifdef CONFIG_ASH_CMDCMD - { BUILTIN_REGULAR "command", commandcmd }, -#endif - { BUILTIN_SPEC_REG "continue", breakcmd }, -#ifdef CONFIG_ASH_BUILTIN_ECHO - { BUILTIN_REGULAR "echo", echocmd }, -#endif - { BUILTIN_SPEC_REG "eval", evalcmd }, - { BUILTIN_SPEC_REG "exec", execcmd }, - { BUILTIN_SPEC_REG "exit", exitcmd }, - { BUILTIN_SPEC_REG_ASSG "export", exportcmd }, - { BUILTIN_REGULAR "false", falsecmd }, -#if JOBS - { BUILTIN_REGULAR "fg", fgcmd }, -#endif -#ifdef CONFIG_ASH_GETOPTS - { BUILTIN_REGULAR "getopts", getoptscmd }, -#endif - { BUILTIN_NOSPEC "hash", hashcmd }, -#ifndef CONFIG_FEATURE_SH_EXTRA_QUIET - { BUILTIN_NOSPEC "help", helpcmd }, -#endif -#if JOBS - { BUILTIN_REGULAR "jobs", jobscmd }, - { BUILTIN_REGULAR "kill", killcmd }, -#endif -#ifdef CONFIG_ASH_MATH_SUPPORT - { BUILTIN_NOSPEC "let", letcmd }, -#endif - { BUILTIN_ASSIGN "local", localcmd }, - { BUILTIN_NOSPEC "pwd", pwdcmd }, - { BUILTIN_REGULAR "read", readcmd }, - { BUILTIN_SPEC_REG_ASSG "readonly", exportcmd }, - { BUILTIN_SPEC_REG "return", returncmd }, - { BUILTIN_SPEC_REG "set", setcmd }, - { BUILTIN_SPEC_REG "shift", shiftcmd }, - { BUILTIN_SPEC_REG "source", dotcmd }, -#ifdef CONFIG_ASH_BUILTIN_TEST - { BUILTIN_REGULAR "test", testcmd }, -#endif - { BUILTIN_SPEC_REG "times", timescmd }, - { BUILTIN_SPEC_REG "trap", trapcmd }, - { BUILTIN_REGULAR "true", truecmd }, - { BUILTIN_NOSPEC "type", typecmd }, - { BUILTIN_NOSPEC "ulimit", ulimitcmd }, - { BUILTIN_REGULAR "umask", umaskcmd }, -#ifdef CONFIG_ASH_ALIAS - { BUILTIN_REGULAR "unalias", unaliascmd }, -#endif - { BUILTIN_SPEC_REG "unset", unsetcmd }, - { BUILTIN_REGULAR "wait", waitcmd }, -}; - -#define NUMBUILTINS (sizeof (builtincmd) / sizeof (struct builtincmd) ) - -static const char *safe_applets[] = { - "[", "test", "echo", "cat", - "ln", "cp", "touch", "mkdir", "rm", - "cut", "hexdump", "awk", "sort", - "find", "xargs", "ls", "dd", - "chown", "chmod" -}; - - -struct cmdentry { - int cmdtype; - union param { - int index; - const struct builtincmd *cmd; - struct funcnode *func; - } u; -}; - - -/* action to find_command() */ -#define DO_ERR 0x01 /* prints errors */ -#define DO_ABS 0x02 /* checks absolute paths */ -#define DO_NOFUNC 0x04 /* don't return shell functions, for command */ -#define DO_ALTPATH 0x08 /* using alternate path */ -#define DO_ALTBLTIN 0x20 /* %builtin in alt. path */ - -static const char *pathopt; /* set by padvance */ - -static void shellexec(char **, const char *, int) - ATTRIBUTE_NORETURN; -static char *padvance(const char **, const char *); -static void find_command(char *, struct cmdentry *, int, const char *); -static struct builtincmd *find_builtin(const char *); -static void hashcd(void); -static void changepath(const char *); -static void defun(char *, union node *); -static void unsetfunc(const char *); - -#ifdef CONFIG_ASH_MATH_SUPPORT_64 -typedef int64_t arith_t; -#define arith_t_type (long long) -#else -typedef long arith_t; -#define arith_t_type (long) -#endif - -#ifdef CONFIG_ASH_MATH_SUPPORT -static arith_t dash_arith(const char *); -static arith_t arith(const char *expr, int *perrcode); -#endif - -#ifdef CONFIG_ASH_RANDOM_SUPPORT -static unsigned long rseed; -static void change_random(const char *); -# ifndef DYNAMIC_VAR -# define DYNAMIC_VAR -# endif -#endif - -/* init.h */ - -static void reset(void); - -/* var.h */ - -/* - * Shell variables. - */ - -/* flags */ -#define VEXPORT 0x01 /* variable is exported */ -#define VREADONLY 0x02 /* variable cannot be modified */ -#define VSTRFIXED 0x04 /* variable struct is statically allocated */ -#define VTEXTFIXED 0x08 /* text is statically allocated */ -#define VSTACK 0x10 /* text is allocated on the stack */ -#define VUNSET 0x20 /* the variable is not set */ -#define VNOFUNC 0x40 /* don't call the callback function */ -#define VNOSET 0x80 /* do not set variable - just readonly test */ -#define VNOSAVE 0x100 /* when text is on the heap before setvareq */ -#ifdef DYNAMIC_VAR -# define VDYNAMIC 0x200 /* dynamic variable */ -# else -# define VDYNAMIC 0 -#endif - -struct var { - struct var *next; /* next entry in hash list */ - int flags; /* flags are defined above */ - const char *text; /* name=value */ - void (*func)(const char *); /* function to be called when */ - /* the variable gets set/unset */ -}; - -struct localvar { - struct localvar *next; /* next local variable in list */ - struct var *vp; /* the variable that was made local */ - int flags; /* saved flags */ - const char *text; /* saved text */ -}; - - -static struct localvar *localvars; - -/* - * Shell variables. - */ - -#ifdef CONFIG_ASH_GETOPTS -static void getoptsreset(const char *); -#endif - -#ifdef CONFIG_LOCALE_SUPPORT -static void change_lc_all(const char *value); -static void change_lc_ctype(const char *value); -#endif - - -#define VTABSIZE 39 - -static const char defpathvar[] = "PATH=/usr/local/bin:/usr/bin:/sbin:/bin"; -#ifdef IFS_BROKEN -static const char defifsvar[] = "IFS= \t\n"; -#define defifs (defifsvar + 4) -#else -static const char defifs[] = " \t\n"; -#endif - - -static struct var varinit[] = { -#ifdef IFS_BROKEN - { 0, VSTRFIXED|VTEXTFIXED, defifsvar, 0 }, -#else - { 0, VSTRFIXED|VTEXTFIXED|VUNSET, "IFS\0", 0 }, -#endif - -#ifdef CONFIG_ASH_MAIL - { 0, VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL\0", changemail }, - { 0, VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH\0", changemail }, -#endif - - { 0, VSTRFIXED|VTEXTFIXED, defpathvar, changepath }, - { 0, VSTRFIXED|VTEXTFIXED, "PS1=$ ", 0 }, - { 0, VSTRFIXED|VTEXTFIXED, "PS2=> ", 0 }, - { 0, VSTRFIXED|VTEXTFIXED, "PS4=+ ", 0 }, -#ifdef CONFIG_ASH_GETOPTS - { 0, VSTRFIXED|VTEXTFIXED, "OPTIND=1", getoptsreset }, -#endif -#ifdef CONFIG_ASH_RANDOM_SUPPORT - {0, VSTRFIXED|VTEXTFIXED|VUNSET|VDYNAMIC, "RANDOM\0", change_random }, -#endif -#ifdef CONFIG_LOCALE_SUPPORT - {0, VSTRFIXED | VTEXTFIXED | VUNSET, "LC_ALL\0", change_lc_all }, - {0, VSTRFIXED | VTEXTFIXED | VUNSET, "LC_CTYPE\0", change_lc_ctype }, -#endif -#ifdef CONFIG_FEATURE_COMMAND_SAVEHISTORY - {0, VSTRFIXED | VTEXTFIXED | VUNSET, "HISTFILE\0", NULL }, -#endif -}; - -#define vifs varinit[0] -#ifdef CONFIG_ASH_MAIL -#define vmail (&vifs)[1] -#define vmpath (&vmail)[1] -#else -#define vmpath vifs -#endif -#define vpath (&vmpath)[1] -#define vps1 (&vpath)[1] -#define vps2 (&vps1)[1] -#define vps4 (&vps2)[1] -#define voptind (&vps4)[1] -#ifdef CONFIG_ASH_GETOPTS -#define vrandom (&voptind)[1] -#else -#define vrandom (&vps4)[1] -#endif -#define defpath (defpathvar + 5) - -/* - * The following macros access the values of the above variables. - * They have to skip over the name. They return the null string - * for unset variables. - */ - -#define ifsval() (vifs.text + 4) -#define ifsset() ((vifs.flags & VUNSET) == 0) -#define mailval() (vmail.text + 5) -#define mpathval() (vmpath.text + 9) -#define pathval() (vpath.text + 5) -#define ps1val() (vps1.text + 4) -#define ps2val() (vps2.text + 4) -#define ps4val() (vps4.text + 4) -#define optindval() (voptind.text + 7) - -#define mpathset() ((vmpath.flags & VUNSET) == 0) - -static void setvar(const char *, const char *, int); -static void setvareq(char *, int); -static void listsetvar(struct strlist *, int); -static char *lookupvar(const char *); -static char *bltinlookup(const char *); -static char **listvars(int, int, char ***); -#define environment() listvars(VEXPORT, VUNSET, 0) -static int showvars(const char *, int, int); -static void poplocalvars(void); -static int unsetvar(const char *); -#ifdef CONFIG_ASH_GETOPTS -static int setvarsafe(const char *, const char *, int); -#endif -static int varcmp(const char *, const char *); -static struct var **hashvar(const char *); - - -static int varequal(const char *a, const char *b) { - return !varcmp(a, b); -} - - -static int loopnest; /* current loop nesting level */ - -/* - * The parsefile structure pointed to by the global variable parsefile - * contains information about the current file being read. - */ - - -struct redirtab { - struct redirtab *next; - int renamed[10]; - int nullredirs; -}; - -static struct redirtab *redirlist; -static int nullredirs; - -extern char **environ; - -/* output.h */ - - -static void outstr(const char *, FILE *); -static void outcslow(int, FILE *); -static void flushall(void); -static void flusherr(void); -static int out1fmt(const char *, ...) - __attribute__((__format__(__printf__,1,2))); -static int fmtstr(char *, size_t, const char *, ...) - __attribute__((__format__(__printf__,3,4))); - -static int preverrout_fd; /* save fd2 before print debug if xflag is set. */ - - -static void out1str(const char *p) -{ - outstr(p, stdout); -} - -static void out2str(const char *p) -{ - outstr(p, stderr); - flusherr(); -} - -/* - * Initialization code. - */ - -/* - * This routine initializes the builtin variables. - */ - -static void initvar(void) -{ - struct var *vp; - struct var *end; - struct var **vpp; - - /* - * PS1 depends on uid - */ -#if defined(CONFIG_FEATURE_COMMAND_EDITING) && defined(CONFIG_FEATURE_SH_FANCY_PROMPT) - vps1.text = "PS1=\\w \\$ "; -#else - if (!geteuid()) - vps1.text = "PS1=# "; -#endif - vp = varinit; - end = vp + sizeof(varinit) / sizeof(varinit[0]); - do { - vpp = hashvar(vp->text); - vp->next = *vpp; - *vpp = vp; - } while (++vp < end); -} - -static void init(void) -{ - - /* from input.c: */ - { - basepf.nextc = basepf.buf = basebuf; - } - - /* from trap.c: */ - { - signal(SIGCHLD, SIG_DFL); - } - - /* from var.c: */ - { - char **envp; - char ppid[32]; - const char *p; - struct stat st1, st2; - - initvar(); - for (envp = environ ; envp && *envp ; envp++) { - if (strchr(*envp, '=')) { - setvareq(*envp, VEXPORT|VTEXTFIXED); - } - } - - snprintf(ppid, sizeof(ppid), "%d", (int) getppid()); - setvar("PPID", ppid, 0); - - p = lookupvar("PWD"); - if (p) - if (*p != '/' || stat(p, &st1) || stat(".", &st2) || - st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino) - p = 0; - setpwd(p, 0); - } -} - -/* PEOF (the end of file marker) */ - -enum { - INPUT_PUSH_FILE = 1, - INPUT_NOFILE_OK = 2, -}; - -/* - * The input line number. Input.c just defines this variable, and saves - * and restores it when files are pushed and popped. The user of this - * package must set its value. - */ - -static int pgetc(void); -static int pgetc2(void); -static int preadbuffer(void); -static void pungetc(void); -static void pushstring(char *, void *); -static void popstring(void); -static void setinputfd(int, int); -static void setinputstring(char *); -static void popfile(void); -static void popallfiles(void); -static void closescript(void); - - -/* jobs.h */ - - -/* Mode argument to forkshell. Don't change FORK_FG or FORK_BG. */ -#define FORK_FG 0 -#define FORK_BG 1 -#define FORK_NOJOB 2 - -/* mode flags for showjob(s) */ -#define SHOW_PGID 0x01 /* only show pgid - for jobs -p */ -#define SHOW_PID 0x04 /* include process pid */ -#define SHOW_CHANGED 0x08 /* only jobs whose state has changed */ - - -/* - * A job structure contains information about a job. A job is either a - * single process or a set of processes contained in a pipeline. In the - * latter case, pidlist will be non-NULL, and will point to a -1 terminated - * array of pids. - */ - -struct procstat { - pid_t pid; /* process id */ - int status; /* last process status from wait() */ - char *cmd; /* text of command being run */ -}; - -struct job { - struct procstat ps0; /* status of process */ - struct procstat *ps; /* status or processes when more than one */ -#if JOBS - int stopstatus; /* status of a stopped job */ -#endif - uint32_t - nprocs: 16, /* number of processes */ - state: 8, -#define JOBRUNNING 0 /* at least one proc running */ -#define JOBSTOPPED 1 /* all procs are stopped */ -#define JOBDONE 2 /* all procs are completed */ -#if JOBS - sigint: 1, /* job was killed by SIGINT */ - jobctl: 1, /* job running under job control */ -#endif - waited: 1, /* true if this entry has been waited for */ - used: 1, /* true if this entry is in used */ - changed: 1; /* true if status has changed */ - struct job *prev_job; /* previous job */ -}; - -static pid_t backgndpid; /* pid of last background process */ -static int job_warning; /* user was warned about stopped jobs */ -#if JOBS -static int jobctl; /* true if doing job control */ -#endif - -static struct job *makejob(union node *, int); -static int forkshell(struct job *, union node *, int); -static int waitforjob(struct job *); -static int stoppedjobs(void); - -#if ! JOBS -#define setjobctl(on) /* do nothing */ -#else -static void setjobctl(int); -static void showjobs(FILE *, int); -#endif - -/* main.h */ - - -/* pid of main shell */ -static int rootpid; -/* shell level: 0 for the main shell, 1 for its children, and so on */ -static int shlvl; -#define rootshell (!shlvl) - -static void readcmdfile(char *); -static int cmdloop(int); - -/* memalloc.h */ - - -struct stackmark { - struct stack_block *stackp; - char *stacknxt; - size_t stacknleft; - struct stackmark *marknext; -}; - -/* minimum size of a block */ -#define MINSIZE SHELL_ALIGN(504) - -struct stack_block { - struct stack_block *prev; - char space[MINSIZE]; -}; - -static struct stack_block stackbase; -static struct stack_block *stackp = &stackbase; -static struct stackmark *markp; -static char *stacknxt = stackbase.space; -static size_t stacknleft = MINSIZE; -static char *sstrend = stackbase.space + MINSIZE; -static int herefd = -1; - - -static pointer ckmalloc(size_t); -static pointer ckrealloc(pointer, size_t); -static char *savestr(const char *); -static pointer stalloc(size_t); -static void stunalloc(pointer); -static void setstackmark(struct stackmark *); -static void popstackmark(struct stackmark *); -static void growstackblock(void); -static void *growstackstr(void); -static char *makestrspace(size_t, char *); -static char *stnputs(const char *, size_t, char *); -static char *stputs(const char *, char *); - - -static char *_STPUTC(int c, char *p) { - if (p == sstrend) - p = growstackstr(); - *p++ = c; - return p; -} - -#define stackblock() ((void *)stacknxt) -#define stackblocksize() stacknleft -#define STARTSTACKSTR(p) ((p) = stackblock()) -#define STPUTC(c, p) ((p) = _STPUTC((c), (p))) -#define CHECKSTRSPACE(n, p) \ - ({ \ - char *q = (p); \ - size_t l = (n); \ - size_t m = sstrend - q; \ - if (l > m) \ - (p) = makestrspace(l, q); \ - 0; \ - }) -#define USTPUTC(c, p) (*p++ = (c)) -#define STACKSTRNUL(p) ((p) == sstrend? (p = growstackstr(), *p = '\0') : (*p = '\0')) -#define STUNPUTC(p) (--p) -#define STTOPC(p) p[-1] -#define STADJUST(amount, p) (p += (amount)) - -#define grabstackstr(p) stalloc((char *)(p) - (char *)stackblock()) -#define ungrabstackstr(s, p) stunalloc((s)) -#define stackstrend() ((void *)sstrend) - -#define ckfree(p) free((pointer)(p)) - -/* mystring.h */ - - -#define DOLATSTRLEN 4 - -static char *prefix(const char *, const char *); -static int number(const char *); -static int is_number(const char *); -static char *single_quote(const char *); -static char *sstrdup(const char *); - -#define equal(s1, s2) (strcmp(s1, s2) == 0) -#define scopy(s1, s2) ((void)strcpy(s2, s1)) - -/* options.h */ - -struct shparam { - int nparam; /* # of positional parameters (without $0) */ - unsigned char malloc; /* if parameter list dynamically allocated */ - char **p; /* parameter list */ -#ifdef CONFIG_ASH_GETOPTS - int optind; /* next parameter to be processed by getopts */ - int optoff; /* used by getopts */ -#endif -}; - - -#define eflag optlist[0] -#define fflag optlist[1] -#define Iflag optlist[2] -#define iflag optlist[3] -#define mflag optlist[4] -#define nflag optlist[5] -#define sflag optlist[6] -#define xflag optlist[7] -#define vflag optlist[8] -#define Cflag optlist[9] -#define aflag optlist[10] -#define bflag optlist[11] -#define uflag optlist[12] -#define viflag optlist[13] - -#if DEBUG -#define nolog optlist[14] -#define debug optlist[15] -#endif - -#ifndef CONFIG_FEATURE_COMMAND_EDITING_VI -#define setvimode(on) viflag = 0 /* forcibly keep the option off */ -#endif - -/* options.c */ - - -static const char *const optletters_optnames[] = { - "e" "errexit", - "f" "noglob", - "I" "ignoreeof", - "i" "interactive", - "m" "monitor", - "n" "noexec", - "s" "stdin", - "x" "xtrace", - "v" "verbose", - "C" "noclobber", - "a" "allexport", - "b" "notify", - "u" "nounset", - "\0" "vi", -#if DEBUG - "\0" "nolog", - "\0" "debug", -#endif -}; - -#define optletters(n) optletters_optnames[(n)][0] -#define optnames(n) (&optletters_optnames[(n)][1]) - -#define NOPTS (sizeof(optletters_optnames)/sizeof(optletters_optnames[0])) - -static char optlist[NOPTS]; - - -static char *arg0; /* value of $0 */ -static struct shparam shellparam; /* $@ current positional parameters */ -static char **argptr; /* argument list for builtin commands */ -static char *optionarg; /* set by nextopt (like getopt) */ -static char *optptr; /* used by nextopt */ - -static char *minusc; /* argument to -c option */ - - -static void procargs(int, char **); -static void optschanged(void); -static void setparam(char **); -static void freeparam(volatile struct shparam *); -static int shiftcmd(int, char **); -static int setcmd(int, char **); -static int nextopt(const char *); - -/* redir.h */ - -/* flags passed to redirect */ -#define REDIR_PUSH 01 /* save previous values of file descriptors */ -#define REDIR_SAVEFD2 03 /* set preverrout */ - -union node; -static void redirect(union node *, int); -static void popredir(int); -static void clearredir(int); -static int copyfd(int, int); -static int redirectsafe(union node *, int); - -/* show.h */ - - -#if DEBUG -static void showtree(union node *); -static void trace(const char *, ...); -static void tracev(const char *, va_list); -static void trargs(char **); -static void trputc(int); -static void trputs(const char *); -static void opentrace(void); -#endif - -/* trap.h */ - - -/* trap handler commands */ -static char *trap[NSIG]; -/* current value of signal */ -static char sigmode[NSIG - 1]; -/* indicates specified signal received */ -static char gotsig[NSIG - 1]; - -static void clear_traps(void); -static void setsignal(int); -static void ignoresig(int); -static void onsig(int); -static int dotrap(void); -static void setinteractive(int); -static void exitshell(void) ATTRIBUTE_NORETURN; - - -static int is_safe_applet(char *name) -{ - int n = sizeof(safe_applets) / sizeof(char *); - int i; - for (i = 0; i < n; i++) - if (strcmp(safe_applets[i], name) == 0) - return 1; - - return 0; -} - - -/* - * This routine is called when an error or an interrupt occurs in an - * interactive shell and control is returned to the main command loop. - */ - -static void -reset(void) -{ - /* from eval.c: */ - { - evalskip = 0; - loopnest = 0; - } - - /* from input.c: */ - { - parselleft = parsenleft = 0; /* clear input buffer */ - popallfiles(); - } - - /* from parser.c: */ - { - tokpushback = 0; - checkkwd = 0; - } - - /* from redir.c: */ - { - clearredir(0); - } - -} - -#ifdef CONFIG_ASH_ALIAS -static struct alias *atab[ATABSIZE]; - -static void setalias(const char *, const char *); -static struct alias *freealias(struct alias *); -static struct alias **__lookupalias(const char *); - -static void -setalias(const char *name, const char *val) -{ - struct alias *ap, **app; - - app = __lookupalias(name); - ap = *app; - INTOFF; - if (ap) { - if (!(ap->flag & ALIASINUSE)) { - ckfree(ap->val); - } - ap->val = savestr(val); - ap->flag &= ~ALIASDEAD; - } else { - /* not found */ - ap = ckmalloc(sizeof (struct alias)); - ap->name = savestr(name); - ap->val = savestr(val); - ap->flag = 0; - ap->next = 0; - *app = ap; - } - INTON; -} - -static int -unalias(const char *name) -{ - struct alias **app; - - app = __lookupalias(name); - - if (*app) { - INTOFF; - *app = freealias(*app); - INTON; - return 0; - } - - return 1; -} - -static void -rmaliases(void) -{ - struct alias *ap, **app; - int i; - - INTOFF; - for (i = 0; i < ATABSIZE; i++) { - app = &atab[i]; - for (ap = *app; ap; ap = *app) { - *app = freealias(*app); - if (ap == *app) { - app = &ap->next; - } - } - } - INTON; -} - -static struct alias * -lookupalias(const char *name, int check) -{ - struct alias *ap = *__lookupalias(name); - - if (check && ap && (ap->flag & ALIASINUSE)) - return NULL; - return ap; -} - -/* - * TODO - sort output - */ -static int -aliascmd(int argc, char **argv) -{ - char *n, *v; - int ret = 0; - struct alias *ap; - - if (argc == 1) { - int i; - - for (i = 0; i < ATABSIZE; i++) - for (ap = atab[i]; ap; ap = ap->next) { - printalias(ap); - } - return 0; - } - while ((n = *++argv) != NULL) { - if ((v = strchr(n+1, '=')) == NULL) { /* n+1: funny ksh stuff */ - if ((ap = *__lookupalias(n)) == NULL) { - fprintf(stderr, "%s: %s not found\n", "alias", n); - ret = 1; - } else - printalias(ap); - } else { - *v++ = '\0'; - setalias(n, v); - } - } - - return ret; -} - -static int -unaliascmd(int argc, char **argv) -{ - int i; - - while ((i = nextopt("a")) != '\0') { - if (i == 'a') { - rmaliases(); - return 0; - } - } - for (i = 0; *argptr; argptr++) { - if (unalias(*argptr)) { - fprintf(stderr, "%s: %s not found\n", "unalias", *argptr); - i = 1; - } - } - - return i; -} - -static struct alias * -freealias(struct alias *ap) { - struct alias *next; - - if (ap->flag & ALIASINUSE) { - ap->flag |= ALIASDEAD; - return ap; - } - - next = ap->next; - ckfree(ap->name); - ckfree(ap->val); - ckfree(ap); - return next; -} - -static void -printalias(const struct alias *ap) { - out1fmt("%s=%s\n", ap->name, single_quote(ap->val)); -} - -static struct alias ** -__lookupalias(const char *name) { - unsigned int hashval; - struct alias **app; - const char *p; - unsigned int ch; - - p = name; - - ch = (unsigned char)*p; - hashval = ch << 4; - while (ch) { - hashval += ch; - ch = (unsigned char)*++p; - } - app = &atab[hashval % ATABSIZE]; - - for (; *app; app = &(*app)->next) { - if (equal(name, (*app)->name)) { - break; - } - } - - return app; -} -#endif /* CONFIG_ASH_ALIAS */ - - -/* cd.c */ - -/* - * The cd and pwd commands. - */ - -#define CD_PHYSICAL 1 -#define CD_PRINT 2 - -static int docd(const char *, int); -static int cdopt(void); - -static char *curdir = nullstr; /* current working directory */ -static char *physdir = nullstr; /* physical working directory */ - -static int -cdopt(void) -{ - int flags = 0; - int i, j; - - j = 'L'; - while ((i = nextopt("LP"))) { - if (i != j) { - flags ^= CD_PHYSICAL; - j = i; - } - } - - return flags; -} - -static int -cdcmd(int argc, char **argv) -{ - const char *dest; - const char *path; - const char *p; - char c; - struct stat statb; - int flags; - - flags = cdopt(); - dest = *argptr; - if (!dest) - dest = bltinlookup(homestr); - else if (LONE_DASH(dest)) { - dest = bltinlookup("OLDPWD"); - flags |= CD_PRINT; - } - if (!dest) - dest = nullstr; - if (*dest == '/') - goto step7; - if (*dest == '.') { - c = dest[1]; -dotdot: - switch (c) { - case '\0': - case '/': - goto step6; - case '.': - c = dest[2]; - if (c != '.') - goto dotdot; - } - } - if (!*dest) - dest = "."; - if (!(path = bltinlookup("CDPATH"))) { -step6: -step7: - p = dest; - goto docd; - } - do { - c = *path; - p = padvance(&path, dest); - if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) { - if (c && c != ':') - flags |= CD_PRINT; -docd: - if (!docd(p, flags)) - goto out; - break; - } - } while (path); - sh_error("can't cd to %s", dest); - /* NOTREACHED */ -out: - if (flags & CD_PRINT) - out1fmt(snlfmt, curdir); - return 0; -} - - -/* - * Update curdir (the name of the current directory) in response to a - * cd command. - */ - -static const char * updatepwd(const char *dir) -{ - char *new; - char *p; - char *cdcomppath; - const char *lim; - - cdcomppath = sstrdup(dir); - STARTSTACKSTR(new); - if (*dir != '/') { - if (curdir == nullstr) - return 0; - new = stputs(curdir, new); - } - new = makestrspace(strlen(dir) + 2, new); - lim = stackblock() + 1; - if (*dir != '/') { - if (new[-1] != '/') - USTPUTC('/', new); - if (new > lim && *lim == '/') - lim++; - } else { - USTPUTC('/', new); - cdcomppath++; - if (dir[1] == '/' && dir[2] != '/') { - USTPUTC('/', new); - cdcomppath++; - lim++; - } - } - p = strtok(cdcomppath, "/"); - while (p) { - switch(*p) { - case '.': - if (p[1] == '.' && p[2] == '\0') { - while (new > lim) { - STUNPUTC(new); - if (new[-1] == '/') - break; - } - break; - } else if (p[1] == '\0') - break; - /* fall through */ - default: - new = stputs(p, new); - USTPUTC('/', new); - } - p = strtok(0, "/"); - } - if (new > lim) - STUNPUTC(new); - *new = 0; - return stackblock(); -} - -/* - * Actually do the chdir. We also call hashcd to let the routines in exec.c - * know that the current directory has changed. - */ - -static int -docd(const char *dest, int flags) -{ - const char *dir = 0; - int err; - - TRACE(("docd(\"%s\", %d) called\n", dest, flags)); - - INTOFF; - if (!(flags & CD_PHYSICAL)) { - dir = updatepwd(dest); - if (dir) - dest = dir; - } - err = chdir(dest); - if (err) - goto out; - setpwd(dir, 1); - hashcd(); -out: - INTON; - return err; -} - -/* - * Find out what the current directory is. If we already know the current - * directory, this routine returns immediately. - */ -static char * getpwd(void) -{ - char *dir = getcwd(0, 0); - return dir ? dir : nullstr; -} - -static int -pwdcmd(int argc, char **argv) -{ - int flags; - const char *dir = curdir; - - flags = cdopt(); - if (flags) { - if (physdir == nullstr) - setpwd(dir, 0); - dir = physdir; - } - out1fmt(snlfmt, dir); - return 0; -} - -static void -setpwd(const char *val, int setold) -{ - char *oldcur, *dir; - - oldcur = dir = curdir; - - if (setold) { - setvar("OLDPWD", oldcur, VEXPORT); - } - INTOFF; - if (physdir != nullstr) { - if (physdir != oldcur) - free(physdir); - physdir = nullstr; - } - if (oldcur == val || !val) { - char *s = getpwd(); - physdir = s; - if (!val) - dir = s; - } else - dir = savestr(val); - if (oldcur != dir && oldcur != nullstr) { - free(oldcur); - } - curdir = dir; - INTON; - setvar("PWD", dir, VEXPORT); -} - -/* error.c */ - -/* - * Errors and exceptions. - */ - -/* - * Code to handle exceptions in C. - */ - - - -static void exverror(int, const char *, va_list) - ATTRIBUTE_NORETURN; - -/* - * Called to raise an exception. Since C doesn't include exceptions, we - * just do a longjmp to the exception handler. The type of exception is - * stored in the global variable "exception". - */ - -static void -exraise(int e) -{ -#if DEBUG - if (handler == NULL) - abort(); -#endif - INTOFF; - - exception = e; - longjmp(handler->loc, 1); -} - - -/* - * Called from trap.c when a SIGINT is received. (If the user specifies - * that SIGINT is to be trapped or ignored using the trap builtin, then - * this routine is not called.) Suppressint is nonzero when interrupts - * are held using the INTOFF macro. (The test for iflag is just - * defensive programming.) - */ - -static void -onint(void) { - int i; - - intpending = 0; - i = EXSIG; - if (gotsig[SIGINT - 1] && !trap[SIGINT]) { - if (!(rootshell && iflag)) { - signal(SIGINT, SIG_DFL); - raise(SIGINT); - } - i = EXINT; - } - exraise(i); - /* NOTREACHED */ -} - -static void -exvwarning(const char *msg, va_list ap) -{ - FILE *errs; - - errs = stderr; - fprintf(errs, "%s: ", arg0); - if (commandname) { - const char *fmt = (!iflag || parsefile->fd) ? - "%s: %d: " : "%s: "; - fprintf(errs, fmt, commandname, startlinno); - } - vfprintf(errs, msg, ap); - outcslow('\n', errs); -} - -/* - * Exverror is called to raise the error exception. If the second argument - * is not NULL then error prints an error message using printf style - * formatting. It then raises the error exception. - */ -static void -exverror(int cond, const char *msg, va_list ap) -{ -#if DEBUG - if (msg) { - TRACE(("exverror(%d, \"", cond)); - TRACEV((msg, ap)); - TRACE(("\") pid=%d\n", getpid())); - } else - TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid())); - if (msg) -#endif - exvwarning(msg, ap); - - flushall(); - exraise(cond); - /* NOTREACHED */ -} - - -static void -sh_error(const char *msg, ...) -{ - va_list ap; - - va_start(ap, msg); - exverror(EXERROR, msg, ap); - /* NOTREACHED */ - va_end(ap); -} - - -static void -exerror(int cond, const char *msg, ...) -{ - va_list ap; - - va_start(ap, msg); - exverror(cond, msg, ap); - /* NOTREACHED */ - va_end(ap); -} - -/* - * error/warning routines for external builtins - */ - -static void -sh_warnx(const char *fmt, ...) -{ - va_list ap; - - va_start(ap, fmt); - exvwarning(fmt, ap); - va_end(ap); -} - - -/* - * Return a string describing an error. The returned string may be a - * pointer to a static buffer that will be overwritten on the next call. - * Action describes the operation that got the error. - */ - -static const char * -errmsg(int e, const char *em) -{ - if(e == ENOENT || e == ENOTDIR) { - - return em; - } - return strerror(e); -} - - -/* eval.c */ - -/* - * Evaluate a command. - */ - -/* flags in argument to evaltree */ -#define EV_EXIT 01 /* exit after evaluating tree */ -#define EV_TESTED 02 /* exit status is checked; ignore -e flag */ -#define EV_BACKCMD 04 /* command executing within back quotes */ - - -static void evalloop(union node *, int); -static void evalfor(union node *, int); -static void evalcase(union node *, int); -static void evalsubshell(union node *, int); -static void expredir(union node *); -static void evalpipe(union node *, int); -static void evalcommand(union node *, int); -static int evalbltin(const struct builtincmd *, int, char **); -static int evalfun(struct funcnode *, int, char **, int); -static void prehash(union node *); -static int bltincmd(int, char **); - - -static const struct builtincmd bltin = { - "\0\0", bltincmd -}; - - -/* - * Called to reset things after an exception. - */ - -/* - * The eval command. - */ - -static int -evalcmd(int argc, char **argv) -{ - char *p; - char *concat; - char **ap; - - if (argc > 1) { - p = argv[1]; - if (argc > 2) { - STARTSTACKSTR(concat); - ap = argv + 2; - for (;;) { - concat = stputs(p, concat); - if ((p = *ap++) == NULL) - break; - STPUTC(' ', concat); - } - STPUTC('\0', concat); - p = grabstackstr(concat); - } - evalstring(p, ~SKIPEVAL); - - } - return exitstatus; -} - - -/* - * Execute a command or commands contained in a string. - */ - -static int -evalstring(char *s, int mask) -{ - union node *n; - struct stackmark smark; - int skip; - - setinputstring(s); - setstackmark(&smark); - - skip = 0; - while ((n = parsecmd(0)) != NEOF) { - evaltree(n, 0); - popstackmark(&smark); - skip = evalskip; - if (skip) - break; - } - popfile(); - - skip &= mask; - evalskip = skip; - return skip; -} - - - -/* - * Evaluate a parse tree. The value is left in the global variable - * exitstatus. - */ - -static void -evaltree(union node *n, int flags) -{ - int checkexit = 0; - void (*evalfn)(union node *, int); - unsigned isor; - int status; - if (n == NULL) { - TRACE(("evaltree(NULL) called\n")); - goto out; - } - TRACE(("pid %d, evaltree(%p: %d, %d) called\n", - getpid(), n, n->type, flags)); - switch (n->type) { - default: -#if DEBUG - out1fmt("Node type = %d\n", n->type); - fflush(stdout); - break; -#endif - case NNOT: - evaltree(n->nnot.com, EV_TESTED); - status = !exitstatus; - goto setstatus; - case NREDIR: - expredir(n->nredir.redirect); - status = redirectsafe(n->nredir.redirect, REDIR_PUSH); - if (!status) { - evaltree(n->nredir.n, flags & EV_TESTED); - status = exitstatus; - } - popredir(0); - goto setstatus; - case NCMD: - evalfn = evalcommand; -checkexit: - if (eflag && !(flags & EV_TESTED)) - checkexit = ~0; - goto calleval; - case NFOR: - evalfn = evalfor; - goto calleval; - case NWHILE: - case NUNTIL: - evalfn = evalloop; - goto calleval; - case NSUBSHELL: - case NBACKGND: - evalfn = evalsubshell; - goto calleval; - case NPIPE: - evalfn = evalpipe; - goto checkexit; - case NCASE: - evalfn = evalcase; - goto calleval; - case NAND: - case NOR: - case NSEMI: -#if NAND + 1 != NOR -#error NAND + 1 != NOR -#endif -#if NOR + 1 != NSEMI -#error NOR + 1 != NSEMI -#endif - isor = n->type - NAND; - evaltree( - n->nbinary.ch1, - (flags | ((isor >> 1) - 1)) & EV_TESTED - ); - if (!exitstatus == isor) - break; - if (!evalskip) { - n = n->nbinary.ch2; -evaln: - evalfn = evaltree; -calleval: - evalfn(n, flags); - break; - } - break; - case NIF: - evaltree(n->nif.test, EV_TESTED); - if (evalskip) - break; - if (exitstatus == 0) { - n = n->nif.ifpart; - goto evaln; - } else if (n->nif.elsepart) { - n = n->nif.elsepart; - goto evaln; - } - goto success; - case NDEFUN: - defun(n->narg.text, n->narg.next); -success: - status = 0; -setstatus: - exitstatus = status; - break; - } -out: - if ((checkexit & exitstatus)) - evalskip |= SKIPEVAL; - else if (pendingsigs && dotrap()) - goto exexit; - - if (flags & EV_EXIT) { -exexit: - exraise(EXEXIT); - } -} - - -#if !defined(__alpha__) || (defined(__GNUC__) && __GNUC__ >= 3) -static -#endif -void evaltreenr(union node *, int) __attribute__ ((alias("evaltree"),__noreturn__)); - - -static void -evalloop(union node *n, int flags) -{ - int status; - - loopnest++; - status = 0; - flags &= EV_TESTED; - for (;;) { - int i; - - evaltree(n->nbinary.ch1, EV_TESTED); - if (evalskip) { -skipping: if (evalskip == SKIPCONT && --skipcount <= 0) { - evalskip = 0; - continue; - } - if (evalskip == SKIPBREAK && --skipcount <= 0) - evalskip = 0; - break; - } - i = exitstatus; - if (n->type != NWHILE) - i = !i; - if (i != 0) - break; - evaltree(n->nbinary.ch2, flags); - status = exitstatus; - if (evalskip) - goto skipping; - } - loopnest--; - exitstatus = status; -} - - - -static void -evalfor(union node *n, int flags) -{ - struct arglist arglist; - union node *argp; - struct strlist *sp; - struct stackmark smark; - - setstackmark(&smark); - arglist.lastp = &arglist.list; - for (argp = n->nfor.args ; argp ; argp = argp->narg.next) { - expandarg(argp, &arglist, EXP_FULL | EXP_TILDE | EXP_RECORD); - /* XXX */ - if (evalskip) - goto out; - } - *arglist.lastp = NULL; - - exitstatus = 0; - loopnest++; - flags &= EV_TESTED; - for (sp = arglist.list ; sp ; sp = sp->next) { - setvar(n->nfor.var, sp->text, 0); - evaltree(n->nfor.body, flags); - if (evalskip) { - if (evalskip == SKIPCONT && --skipcount <= 0) { - evalskip = 0; - continue; - } - if (evalskip == SKIPBREAK && --skipcount <= 0) - evalskip = 0; - break; - } - } - loopnest--; -out: - popstackmark(&smark); -} - - - -static void -evalcase(union node *n, int flags) -{ - union node *cp; - union node *patp; - struct arglist arglist; - struct stackmark smark; - - setstackmark(&smark); - arglist.lastp = &arglist.list; - expandarg(n->ncase.expr, &arglist, EXP_TILDE); - exitstatus = 0; - for (cp = n->ncase.cases ; cp && evalskip == 0 ; cp = cp->nclist.next) { - for (patp = cp->nclist.pattern ; patp ; patp = patp->narg.next) { - if (casematch(patp, arglist.list->text)) { - if (evalskip == 0) { - evaltree(cp->nclist.body, flags); - } - goto out; - } - } - } -out: - popstackmark(&smark); -} - - - -/* - * Kick off a subshell to evaluate a tree. - */ - -static void -evalsubshell(union node *n, int flags) -{ - struct job *jp; - int backgnd = (n->type == NBACKGND); - int status; - - expredir(n->nredir.redirect); - if (!backgnd && flags & EV_EXIT && !trap[0]) - goto nofork; - INTOFF; - jp = makejob(n, 1); - if (forkshell(jp, n, backgnd) == 0) { - INTON; - flags |= EV_EXIT; - if (backgnd) - flags &=~ EV_TESTED; -nofork: - redirect(n->nredir.redirect, 0); - evaltreenr(n->nredir.n, flags); - /* never returns */ - } - status = 0; - if (! backgnd) - status = waitforjob(jp); - exitstatus = status; - INTON; -} - - - -/* - * Compute the names of the files in a redirection list. - */ - -static void -expredir(union node *n) -{ - union node *redir; - - for (redir = n ; redir ; redir = redir->nfile.next) { - struct arglist fn; - memset(&fn, 0, sizeof(struct arglist)); - fn.lastp = &fn.list; - switch (redir->type) { - case NFROMTO: - case NFROM: - case NTO: - case NCLOBBER: - case NAPPEND: - expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR); - redir->nfile.expfname = fn.list->text; - break; - case NFROMFD: - case NTOFD: - if (redir->ndup.vname) { - expandarg(redir->ndup.vname, &fn, EXP_FULL | EXP_TILDE); - if (fn.list != NULL) - fixredir(redir, fn.list->text, 1); - else - sh_error("redir error"); - } - break; - } - } -} - - - -/* - * Evaluate a pipeline. All the processes in the pipeline are children - * of the process creating the pipeline. (This differs from some versions - * of the shell, which make the last process in a pipeline the parent - * of all the rest.) - */ - -static void -evalpipe(union node *n, int flags) -{ - struct job *jp; - struct nodelist *lp; - int pipelen; - int prevfd; - int pip[2]; - - TRACE(("evalpipe(0x%lx) called\n", (long)n)); - pipelen = 0; - for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) - pipelen++; - flags |= EV_EXIT; - INTOFF; - jp = makejob(n, pipelen); - prevfd = -1; - for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) { - prehash(lp->n); - pip[1] = -1; - if (lp->next) { - if (pipe(pip) < 0) { - close(prevfd); - sh_error("Pipe call failed"); - } - } - if (forkshell(jp, lp->n, n->npipe.backgnd) == 0) { - INTON; - if (pip[1] >= 0) { - close(pip[0]); - } - if (prevfd > 0) { - dup2(prevfd, 0); - close(prevfd); - } - if (pip[1] > 1) { - dup2(pip[1], 1); - close(pip[1]); - } - evaltreenr(lp->n, flags); - /* never returns */ - } - if (prevfd >= 0) - close(prevfd); - prevfd = pip[0]; - close(pip[1]); - } - if (n->npipe.backgnd == 0) { - exitstatus = waitforjob(jp); - TRACE(("evalpipe: job done exit status %d\n", exitstatus)); - } - INTON; -} - - - -/* - * Execute a command inside back quotes. If it's a builtin command, we - * want to save its output in a block obtained from malloc. Otherwise - * we fork off a subprocess and get the output of the command via a pipe. - * Should be called with interrupts off. - */ - -static void -evalbackcmd(union node *n, struct backcmd *result) -{ - int saveherefd; - - result->fd = -1; - result->buf = NULL; - result->nleft = 0; - result->jp = NULL; - if (n == NULL) { - goto out; - } - - saveherefd = herefd; - herefd = -1; - - { - int pip[2]; - struct job *jp; - - if (pipe(pip) < 0) - sh_error("Pipe call failed"); - jp = makejob(n, 1); - if (forkshell(jp, n, FORK_NOJOB) == 0) { - FORCEINTON; - close(pip[0]); - if (pip[1] != 1) { - close(1); - copyfd(pip[1], 1); - close(pip[1]); - } - eflag = 0; - evaltreenr(n, EV_EXIT); - /* NOTREACHED */ - } - close(pip[1]); - result->fd = pip[0]; - result->jp = jp; - } - herefd = saveherefd; -out: - TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n", - result->fd, result->buf, result->nleft, result->jp)); -} - -#ifdef CONFIG_ASH_CMDCMD -static char ** parse_command_args(char **argv, const char **path) -{ - char *cp, c; - - for (;;) { - cp = *++argv; - if (!cp) - return 0; - if (*cp++ != '-') - break; - if (!(c = *cp++)) - break; - if (c == '-' && !*cp) { - argv++; - break; - } - do { - switch (c) { - case 'p': - *path = defpath; - break; - default: - /* run 'typecmd' for other options */ - return 0; - } - } while ((c = *cp++)); - } - return argv; -} -#endif - -static int isassignment(const char *p) -{ - const char *q = endofname(p); - if (p == q) - return 0; - return *q == '='; -} - -#ifdef CONFIG_ASH_EXPAND_PRMT -static const char *expandstr(const char *ps); -#else -#define expandstr(s) s -#endif - -/* - * Execute a simple command. - */ - -static void -evalcommand(union node *cmd, int flags) -{ - struct stackmark smark; - union node *argp; - struct arglist arglist; - struct arglist varlist; - char **argv; - int argc; - const struct strlist *sp; - struct cmdentry cmdentry; - struct job *jp; - char *lastarg; - const char *path; - int spclbltin; - int cmd_is_exec; - int status; - char **nargv; - struct builtincmd *bcmd; - int pseudovarflag = 0; - - /* First expand the arguments. */ - TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags)); - setstackmark(&smark); - back_exitstatus = 0; - - cmdentry.cmdtype = CMDBUILTIN; - cmdentry.u.cmd = &bltin; - varlist.lastp = &varlist.list; - *varlist.lastp = NULL; - arglist.lastp = &arglist.list; - *arglist.lastp = NULL; - - argc = 0; - if (cmd->ncmd.args) - { - bcmd = find_builtin(cmd->ncmd.args->narg.text); - pseudovarflag = bcmd && IS_BUILTIN_ASSIGN(bcmd); - } - - for (argp = cmd->ncmd.args; argp; argp = argp->narg.next) { - struct strlist **spp; - - spp = arglist.lastp; - if (pseudovarflag && isassignment(argp->narg.text)) - expandarg(argp, &arglist, EXP_VARTILDE); - else - expandarg(argp, &arglist, EXP_FULL | EXP_TILDE); - - for (sp = *spp; sp; sp = sp->next) - argc++; - } - - argv = nargv = stalloc(sizeof (char *) * (argc + 1)); - for (sp = arglist.list ; sp ; sp = sp->next) { - TRACE(("evalcommand arg: %s\n", sp->text)); - *nargv++ = sp->text; - } - *nargv = NULL; - - lastarg = NULL; - if (iflag && funcnest == 0 && argc > 0) - lastarg = nargv[-1]; - - preverrout_fd = 2; - expredir(cmd->ncmd.redirect); - status = redirectsafe(cmd->ncmd.redirect, REDIR_PUSH|REDIR_SAVEFD2); - - path = vpath.text; - for (argp = cmd->ncmd.assign; argp; argp = argp->narg.next) { - struct strlist **spp; - char *p; - - spp = varlist.lastp; - expandarg(argp, &varlist, EXP_VARTILDE); - - /* - * Modify the command lookup path, if a PATH= assignment - * is present - */ - p = (*spp)->text; - if (varequal(p, path)) - path = p; - } - - /* Print the command if xflag is set. */ - if (xflag) { - int n; - const char *p = " %s"; - - p++; - dprintf(preverrout_fd, p, expandstr(ps4val())); - - sp = varlist.list; - for(n = 0; n < 2; n++) { - while (sp) { - dprintf(preverrout_fd, p, sp->text); - sp = sp->next; - if(*p == '%') { - p--; - } - } - sp = arglist.list; - } - full_write(preverrout_fd, "\n", 1); - } - - cmd_is_exec = 0; - spclbltin = -1; - - /* Now locate the command. */ - if (argc) { - const char *oldpath; - int cmd_flag = DO_ERR; - - path += 5; - oldpath = path; - for (;;) { - find_command(argv[0], &cmdentry, cmd_flag, path); - if (cmdentry.cmdtype == CMDUNKNOWN) { - status = 127; - flusherr(); - goto bail; - } - - /* implement bltin and command here */ - if (cmdentry.cmdtype != CMDBUILTIN) - break; - if (spclbltin < 0) - spclbltin = IS_BUILTIN_SPECIAL(cmdentry.u.cmd); - if (cmdentry.u.cmd == EXECCMD) - cmd_is_exec++; -#ifdef CONFIG_ASH_CMDCMD - if (cmdentry.u.cmd == COMMANDCMD) { - - path = oldpath; - nargv = parse_command_args(argv, &path); - if (!nargv) - break; - argc -= nargv - argv; - argv = nargv; - cmd_flag |= DO_NOFUNC; - } else -#endif - break; - } - } - - if (status) { - /* We have a redirection error. */ - if (spclbltin > 0) - exraise(EXERROR); -bail: - exitstatus = status; - goto out; - } - - /* Execute the command. */ - switch (cmdentry.cmdtype) { - default: - /* Fork off a child process if necessary. */ - if (!(flags & EV_EXIT) || trap[0]) { - INTOFF; - jp = makejob(cmd, 1); - if (forkshell(jp, cmd, FORK_FG) != 0) { - exitstatus = waitforjob(jp); - INTON; - break; - } - FORCEINTON; - } - listsetvar(varlist.list, VEXPORT|VSTACK); - shellexec(argv, path, cmdentry.u.index); - /* NOTREACHED */ - - case CMDBUILTIN: - cmdenviron = varlist.list; - if (cmdenviron) { - struct strlist *list = cmdenviron; - int i = VNOSET; - if (spclbltin > 0 || argc == 0) { - i = 0; - if (cmd_is_exec && argc > 1) - i = VEXPORT; - } - listsetvar(list, i); - } - if (evalbltin(cmdentry.u.cmd, argc, argv)) { - int exit_status; - int i, j; - - i = exception; - if (i == EXEXIT) - goto raise; - - exit_status = 2; - j = 0; - if (i == EXINT) - j = SIGINT; - if (i == EXSIG) - j = pendingsigs; - if (j) - exit_status = j + 128; - exitstatus = exit_status; - - if (i == EXINT || spclbltin > 0) { -raise: - longjmp(handler->loc, 1); - } - FORCEINTON; - } - break; - - case CMDFUNCTION: - listsetvar(varlist.list, 0); - if (evalfun(cmdentry.u.func, argc, argv, flags)) - goto raise; - break; - } - -out: - popredir(cmd_is_exec); - if (lastarg) - /* dsl: I think this is intended to be used to support - * '_' in 'vi' command mode during line editing... - * However I implemented that within libedit itself. - */ - setvar("_", lastarg, 0); - popstackmark(&smark); -} - -static int -evalbltin(const struct builtincmd *cmd, int argc, char **argv) { - char *volatile savecmdname; - struct jmploc *volatile savehandler; - struct jmploc jmploc; - int i; - - savecmdname = commandname; - if ((i = setjmp(jmploc.loc))) - goto cmddone; - savehandler = handler; - handler = &jmploc; - commandname = argv[0]; - argptr = argv + 1; - optptr = NULL; /* initialize nextopt */ - exitstatus = (*cmd->builtin)(argc, argv); - flushall(); -cmddone: - exitstatus |= ferror(stdout); - clearerr(stdout); - commandname = savecmdname; - exsig = 0; - handler = savehandler; - - return i; -} - -static int -evalfun(struct funcnode *func, int argc, char **argv, int flags) -{ - volatile struct shparam saveparam; - struct localvar *volatile savelocalvars; - struct jmploc *volatile savehandler; - struct jmploc jmploc; - int e; - - saveparam = shellparam; - savelocalvars = localvars; - if ((e = setjmp(jmploc.loc))) { - goto funcdone; - } - INTOFF; - savehandler = handler; - handler = &jmploc; - localvars = NULL; - shellparam.malloc = 0; - func->count++; - funcnest++; - INTON; - shellparam.nparam = argc - 1; - shellparam.p = argv + 1; -#ifdef CONFIG_ASH_GETOPTS - shellparam.optind = 1; - shellparam.optoff = -1; -#endif - evaltree(&func->n, flags & EV_TESTED); -funcdone: - INTOFF; - funcnest--; - freefunc(func); - poplocalvars(); - localvars = savelocalvars; - freeparam(&shellparam); - shellparam = saveparam; - handler = savehandler; - INTON; - evalskip &= ~SKIPFUNC; - return e; -} - - -static int goodname(const char *p) -{ - return !*endofname(p); -} - -/* - * Search for a command. This is called before we fork so that the - * location of the command will be available in the parent as well as - * the child. The check for "goodname" is an overly conservative - * check that the name will not be subject to expansion. - */ - -static void -prehash(union node *n) -{ - struct cmdentry entry; - - if (n->type == NCMD && n->ncmd.args) - if (goodname(n->ncmd.args->narg.text)) - find_command(n->ncmd.args->narg.text, &entry, 0, - pathval()); -} - - - -/* - * Builtin commands. Builtin commands whose functions are closely - * tied to evaluation are implemented here. - */ - -/* - * No command given. - */ - -static int -bltincmd(int argc, char **argv) -{ - /* - * Preserve exitstatus of a previous possible redirection - * as POSIX mandates - */ - return back_exitstatus; -} - - -/* - * Handle break and continue commands. Break, continue, and return are - * all handled by setting the evalskip flag. The evaluation routines - * above all check this flag, and if it is set they start skipping - * commands rather than executing them. The variable skipcount is - * the number of loops to break/continue, or the number of function - * levels to return. (The latter is always 1.) It should probably - * be an error to break out of more loops than exist, but it isn't - * in the standard shell so we don't make it one here. - */ - -static int -breakcmd(int argc, char **argv) -{ - int n = argc > 1 ? number(argv[1]) : 1; - - if (n <= 0) - sh_error(illnum, argv[1]); - if (n > loopnest) - n = loopnest; - if (n > 0) { - evalskip = (**argv == 'c')? SKIPCONT : SKIPBREAK; - skipcount = n; - } - return 0; -} - - -/* - * The return command. - */ - -static int -returncmd(int argc, char **argv) -{ - /* - * If called outside a function, do what ksh does; - * skip the rest of the file. - */ - evalskip = funcnest ? SKIPFUNC : SKIPFILE; - return argv[1] ? number(argv[1]) : exitstatus; -} - - -static int -falsecmd(int argc, char **argv) -{ - return 1; -} - - -static int -truecmd(int argc, char **argv) -{ - return 0; -} - - -static int -execcmd(int argc, char **argv) -{ - if (argc > 1) { - iflag = 0; /* exit on error */ - mflag = 0; - optschanged(); - shellexec(argv + 1, pathval(), 0); - } - return 0; -} - - -/* exec.c */ - -/* - * When commands are first encountered, they are entered in a hash table. - * This ensures that a full path search will not have to be done for them - * on each invocation. - * - * We should investigate converting to a linear search, even though that - * would make the command name "hash" a misnomer. - */ - -#define CMDTABLESIZE 31 /* should be prime */ -#define ARB 1 /* actual size determined at run time */ - - - -struct tblentry { - struct tblentry *next; /* next entry in hash chain */ - union param param; /* definition of builtin function */ - short cmdtype; /* index identifying command */ - char rehash; /* if set, cd done since entry created */ - char cmdname[ARB]; /* name of command */ -}; - - -static struct tblentry *cmdtable[CMDTABLESIZE]; -static int builtinloc = -1; /* index in path of %builtin, or -1 */ - - -static void tryexec(char *, char **, char **); -static void clearcmdentry(int); -static struct tblentry *cmdlookup(const char *, int); -static void delete_cmd_entry(void); + while (*p != '=') + putc(*p++, fp); + if (subtype & VSNUL) + putc(':', fp); -/* - * Exec a program. Never returns. If you change this routine, you may - * have to change the find_command routine as well. - */ + switch (subtype & VSTYPE) { + case VSNORMAL: + putc('}', fp); + break; + case VSMINUS: + putc('-', fp); + break; + case VSPLUS: + putc('+', fp); + break; + case VSQUESTION: + putc('?', fp); + break; + case VSASSIGN: + putc('=', fp); + break; + case VSTRIMLEFT: + putc('#', fp); + break; + case VSTRIMLEFTMAX: + putc('#', fp); + putc('#', fp); + break; + case VSTRIMRIGHT: + putc('%', fp); + break; + case VSTRIMRIGHTMAX: + putc('%', fp); + putc('%', fp); + break; + case VSLENGTH: + break; + default: + out1fmt("", subtype); + } + break; + case CTLENDVAR: + putc('}', fp); + break; + case CTLBACKQ: + case CTLBACKQ|CTLQUOTE: + putc('$', fp); + putc('(', fp); + shtree(bqlist->n, -1, NULL, fp); + putc(')', fp); + break; + default: + putc(*p, fp); + break; + } + } +} static void -shellexec(char **argv, const char *path, int idx) +shcmd(union node *cmd, FILE *fp) { - char *cmdname; - int e; - char **envp; - int exerrno; + union node *np; + int first; + const char *s; + int dftfd; - clearredir(1); - envp = environment(); - if (strchr(argv[0], '/') != NULL - || is_safe_applet(argv[0]) -#ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL - || find_applet_by_name(argv[0]) -#endif - ) { - tryexec(argv[0], argv, envp); - e = errno; - } else { - e = ENOENT; - while ((cmdname = padvance(&path, argv[0])) != NULL) { - if (--idx < 0 && pathopt == NULL) { - tryexec(cmdname, argv, envp); - if (errno != ENOENT && errno != ENOTDIR) - e = errno; - } - stunalloc(cmdname); + first = 1; + for (np = cmd->ncmd.args; np; np = np->narg.next) { + if (!first) + putc(' ', fp); + sharg(np, fp); + first = 0; + } + for (np = cmd->ncmd.redirect; np; np = np->nfile.next) { + if (!first) + putc(' ', fp); + dftfd = 0; + switch (np->nfile.type) { + case NTO: s = ">>"+1; dftfd = 1; break; + case NCLOBBER: s = ">|"; dftfd = 1; break; + case NAPPEND: s = ">>"; dftfd = 1; break; + case NTOFD: s = ">&"; dftfd = 1; break; + case NFROM: s = "<"; break; + case NFROMFD: s = "<&"; break; + case NFROMTO: s = "<>"; break; + default: s = "*error*"; break; + } + if (np->nfile.fd != dftfd) + fprintf(fp, "%d", np->nfile.fd); + fputs(s, fp); + if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) { + fprintf(fp, "%d", np->ndup.dupfd); + } else { + sharg(np->nfile.fname, fp); } + first = 0; } +} - /* Map to POSIX errors */ - switch (e) { - case EACCES: - exerrno = 126; +static void +shtree(union node *n, int ind, char *pfx, FILE *fp) +{ + struct nodelist *lp; + const char *s; + + if (n == NULL) + return; + + indent(ind, pfx, fp); + switch (n->type) { + case NSEMI: + s = "; "; + goto binop; + case NAND: + s = " && "; + goto binop; + case NOR: + s = " || "; + binop: + shtree(n->nbinary.ch1, ind, NULL, fp); + /* if (ind < 0) */ + fputs(s, fp); + shtree(n->nbinary.ch2, ind, NULL, fp); break; - case ENOENT: - exerrno = 127; + case NCMD: + shcmd(n, fp); + if (ind >= 0) + putc('\n', fp); + break; + case NPIPE: + for (lp = n->npipe.cmdlist; lp; lp = lp->next) { + shcmd(lp->n, fp); + if (lp->next) + fputs(" | ", fp); + } + if (n->npipe.backgnd) + fputs(" &", fp); + if (ind >= 0) + putc('\n', fp); break; default: - exerrno = 2; + fprintf(fp, "", n->type); + if (ind >= 0) + putc('\n', fp); break; } - exitstatus = exerrno; - TRACE(("shellexec failed for %s, errno %d, suppressint %d\n", - argv[0], e, suppressint )); - exerror(EXEXEC, "%s: %s", argv[0], errmsg(e, E_EXEC)); - /* NOTREACHED */ } - static void -tryexec(char *cmd, char **argv, char **envp) +showtree(union node *n) { - int repeated = 0; - struct BB_applet *a; - int argc = 0; - char **c; - - if(strchr(cmd, '/') == NULL && is_safe_applet(cmd) && (a = find_applet_by_name(cmd)) != NULL) { - c = argv; - while (*c != NULL) { - c++; argc++; - } - applet_name = cmd; - exit(a->main(argc, argv)); - } -#ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL - if(find_applet_by_name(cmd) != NULL) { - /* re-exec ourselves with the new arguments */ - execve(CONFIG_BUSYBOX_EXEC_PATH,argv,envp); - /* If they called chroot or otherwise made the binary no longer - * executable, fall through */ - } -#endif + trace_puts("showtree called\n"); + shtree(n, 1, NULL, stdout); +} + +#define TRACE(param) trace_printf param +#define TRACEV(param) trace_vprintf param -repeat: -#ifdef SYSV - do { - execve(cmd, argv, envp); - } while (errno == EINTR); #else - execve(cmd, argv, envp); -#endif - if (repeated++) { - ckfree(argv); - } else if (errno == ENOEXEC) { - char **ap; - char **new; - for (ap = argv; *ap; ap++) - ; - ap = new = ckmalloc((ap - argv + 2) * sizeof(char *)); - ap[1] = cmd; - *ap = cmd = (char *)DEFAULT_SHELL; - ap += 2; - argv++; - while ((*ap++ = *argv++)) - ; - argv = new; - goto repeat; - } -} +#define TRACE(param) +#define TRACEV(param) + +#endif /* DEBUG */ +/* ============ Parser data */ /* - * Do a path search. The variable path (passed by reference) should be - * set to the start of the path before the first call; padvance will update - * this value as it proceeds. Successive calls to padvance will return - * the possible path expansions in sequence. If an option (indicated by - * a percent sign) appears in the path entry then the global variable - * pathopt will be set to point to it; otherwise pathopt will be set to - * NULL. + * ash_vmsg() needs parsefile->fd, hence parsefile definition is moved up. */ +struct strlist { + struct strlist *next; + char *text; +}; -static char * -padvance(const char **path, const char *name) -{ - const char *p; - char *q; - const char *start; - size_t len; +#if ENABLE_ASH_ALIAS +struct alias; +#endif - if (*path == NULL) - return NULL; - start = *path; - for (p = start ; *p && *p != ':' && *p != '%' ; p++); - len = p - start + strlen(name) + 2; /* "2" is for '/' and '\0' */ - while (stackblocksize() < len) - growstackblock(); - q = stackblock(); - if (p != start) { - memcpy(q, start, p - start); - q += p - start; - *q++ = '/'; - } - strcpy(q, name); - pathopt = NULL; - if (*p == '%') { - pathopt = ++p; - while (*p && *p != ':') p++; - } - if (*p == ':') - *path = p + 1; - else - *path = NULL; - return stalloc(len); -} +struct strpush { + struct strpush *prev; /* preceding string on stack */ + char *prevstring; + int prevnleft; +#if ENABLE_ASH_ALIAS + struct alias *ap; /* if push was associated with an alias */ +#endif + char *string; /* remember the string since it may change */ +}; + +struct parsefile { + struct parsefile *prev; /* preceding file on stack */ + int linno; /* current line */ + int fd; /* file descriptor (or -1 if string) */ + int nleft; /* number of chars left in this line */ + int lleft; /* number of chars left in this buffer */ + char *nextc; /* next char in buffer */ + char *buf; /* input buffer */ + struct strpush *strpush; /* for pushing strings at this level */ + struct strpush basestrpush; /* so pushing one is fast */ +}; + +static struct parsefile basepf; /* top level input file */ +static struct parsefile *parsefile = &basepf; /* current input file */ +static int startlinno; /* line # where last token started */ +static char *commandname; /* currently executing command */ +static struct strlist *cmdenviron; /* environment for builtin command */ +static int exitstatus; /* exit status of last command */ -/*** Command hashing code ***/ +/* ============ Message printing */ static void -printentry(struct tblentry *cmdp) +ash_vmsg(const char *msg, va_list ap) { - int idx; - const char *path; - char *name; - - idx = cmdp->param.index; - path = pathval(); - do { - name = padvance(&path, cmdp->cmdname); - stunalloc(name); - } while (--idx >= 0); - out1fmt("%s%s\n", name, (cmdp->rehash ? "*" : nullstr)); + fprintf(stderr, "%s: ", arg0); + if (commandname) { + if (strcmp(arg0, commandname)) + fprintf(stderr, "%s: ", commandname); + if (!iflag || parsefile->fd) + fprintf(stderr, "line %d: ", startlinno); + } + vfprintf(stderr, msg, ap); + outcslow('\n', stderr); } - -static int -hashcmd(int argc, char **argv) +/* + * Exverror is called to raise the error exception. If the second argument + * is not NULL then error prints an error message using printf style + * formatting. It then raises the error exception. + */ +static void ash_vmsg_and_raise(int, const char *, va_list) ATTRIBUTE_NORETURN; +static void +ash_vmsg_and_raise(int cond, const char *msg, va_list ap) { - struct tblentry **pp; - struct tblentry *cmdp; - int c; - struct cmdentry entry; - char *name; +#if DEBUG + if (msg) { + TRACE(("ash_vmsg_and_raise(%d, \"", cond)); + TRACEV((msg, ap)); + TRACE(("\") pid=%d\n", getpid())); + } else + TRACE(("ash_vmsg_and_raise(%d, NULL) pid=%d\n", cond, getpid())); + if (msg) +#endif + ash_vmsg(msg, ap); - while ((c = nextopt("r")) != '\0') { - clearcmdentry(0); - return 0; - } - if (*argptr == NULL) { - for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) { - for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) { - if (cmdp->cmdtype == CMDNORMAL) - printentry(cmdp); - } - } - return 0; - } - c = 0; - while ((name = *argptr) != NULL) { - if ((cmdp = cmdlookup(name, 0)) != NULL - && (cmdp->cmdtype == CMDNORMAL - || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))) - delete_cmd_entry(); - find_command(name, &entry, DO_ERR, pathval()); - if (entry.cmdtype == CMDUNKNOWN) - c = 1; - argptr++; - } - return c; + flush_stdout_stderr(); + raise_exception(cond); + /* NOTREACHED */ +} + +static void ash_msg_and_raise_error(const char *, ...) ATTRIBUTE_NORETURN; +static void +ash_msg_and_raise_error(const char *msg, ...) +{ + va_list ap; + + va_start(ap, msg); + ash_vmsg_and_raise(EXERROR, msg, ap); + /* NOTREACHED */ + va_end(ap); } +static void ash_msg_and_raise(int, const char *, ...) ATTRIBUTE_NORETURN; +static void +ash_msg_and_raise(int cond, const char *msg, ...) +{ + va_list ap; + + va_start(ap, msg); + ash_vmsg_and_raise(cond, msg, ap); + /* NOTREACHED */ + va_end(ap); +} /* - * Resolve a command name. If you change this routine, you may have to - * change the shellexec routine as well. + * error/warning routines for external builtins */ - static void -find_command(char *name, struct cmdentry *entry, int act, const char *path) +ash_msg(const char *fmt, ...) { - struct tblentry *cmdp; - int idx; - int prev; - char *fullname; - struct stat statb; - int e; - int updatetbl; - struct builtincmd *bcmd; + va_list ap; - /* If name contains a slash, don't use PATH or hash table */ - if (strchr(name, '/') != NULL) { - entry->u.index = -1; - if (act & DO_ABS) { - while (stat(name, &statb) < 0) { -#ifdef SYSV - if (errno == EINTR) - continue; -#endif - entry->cmdtype = CMDUNKNOWN; - return; - } - } - entry->cmdtype = CMDNORMAL; - return; - } + va_start(ap, fmt); + ash_vmsg(fmt, ap); + va_end(ap); +} -#ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL - if (find_applet_by_name(name)) { - entry->cmdtype = CMDNORMAL; - entry->u.index = -1; - return; +/* + * Return a string describing an error. The returned string may be a + * pointer to a static buffer that will be overwritten on the next call. + * Action describes the operation that got the error. + */ +static const char * +errmsg(int e, const char *em) +{ + if (e == ENOENT || e == ENOTDIR) { + return em; } -#endif + return strerror(e); +} - if (is_safe_applet(name)) { - entry->cmdtype = CMDNORMAL; - entry->u.index = -1; - return; - } - updatetbl = (path == pathval()); - if (!updatetbl) { - act |= DO_ALTPATH; - if (strstr(path, "%builtin") != NULL) - act |= DO_ALTBLTIN; - } +/* ============ Memory allocation */ - /* If name is in the table, check answer will be ok */ - if ((cmdp = cmdlookup(name, 0)) != NULL) { - int bit; +/* + * It appears that grabstackstr() will barf with such alignments + * because stalloc() will return a string allocated in a new stackblock. + */ +#define SHELL_ALIGN(nbytes) (((nbytes) + SHELL_SIZE) & ~SHELL_SIZE) +enum { + /* Most machines require the value returned from malloc to be aligned + * in some way. The following macro will get this right + * on many machines. */ + SHELL_SIZE = sizeof(union {int i; char *cp; double d; }) - 1, + /* Minimum size of a block */ + MINSIZE = SHELL_ALIGN(504), +}; - switch (cmdp->cmdtype) { - default: -#if DEBUG - abort(); -#endif - case CMDNORMAL: - bit = DO_ALTPATH; - break; - case CMDFUNCTION: - bit = DO_NOFUNC; - break; - case CMDBUILTIN: - bit = DO_ALTBLTIN; - break; - } - if (act & bit) { - updatetbl = 0; - cmdp = NULL; - } else if (cmdp->rehash == 0) - /* if not invalidated by cd, we're done */ - goto success; - } +struct stack_block { + struct stack_block *prev; + char space[MINSIZE]; +}; - /* If %builtin not in path, check for builtin next */ - bcmd = find_builtin(name); - if (bcmd && (IS_BUILTIN_REGULAR(bcmd) || ( - act & DO_ALTPATH ? !(act & DO_ALTBLTIN) : builtinloc <= 0 - ))) - goto builtin_success; +struct stackmark { + struct stack_block *stackp; + char *stacknxt; + size_t stacknleft; + struct stackmark *marknext; +}; - /* We have to search path. */ - prev = -1; /* where to start */ - if (cmdp && cmdp->rehash) { /* doing a rehash */ - if (cmdp->cmdtype == CMDBUILTIN) - prev = builtinloc; - else - prev = cmdp->param.index; - } +static struct stack_block stackbase; +static struct stack_block *stackp = &stackbase; +static struct stackmark *markp; +static char *stacknxt = stackbase.space; +static size_t stacknleft = MINSIZE; +static char *sstrend = stackbase.space + MINSIZE; +static int herefd = -1; - e = ENOENT; - idx = -1; -loop: - while ((fullname = padvance(&path, name)) != NULL) { - stunalloc(fullname); - idx++; - if (pathopt) { - if (prefix(pathopt, "builtin")) { - if (bcmd) - goto builtin_success; - continue; - } else if (!(act & DO_NOFUNC) && - prefix(pathopt, "func")) { - /* handled below */ - } else { - /* ignore unimplemented options */ - continue; - } - } - /* if rehash, don't redo absolute path names */ - if (fullname[0] == '/' && idx <= prev) { - if (idx < prev) - continue; - TRACE(("searchexec \"%s\": no change\n", name)); - goto success; - } - while (stat(fullname, &statb) < 0) { -#ifdef SYSV - if (errno == EINTR) - continue; -#endif - if (errno != ENOENT && errno != ENOTDIR) - e = errno; - goto loop; - } - e = EACCES; /* if we fail, this will be the error */ - if (!S_ISREG(statb.st_mode)) - continue; - if (pathopt) { /* this is a %func directory */ - stalloc(strlen(fullname) + 1); - readcmdfile(fullname); - if ((cmdp = cmdlookup(name, 0)) == NULL || - cmdp->cmdtype != CMDFUNCTION) - sh_error("%s not defined in %s", name, fullname); - stunalloc(fullname); - goto success; - } - TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname)); - if (!updatetbl) { - entry->cmdtype = CMDNORMAL; - entry->u.index = idx; - return; - } - INTOFF; - cmdp = cmdlookup(name, 1); - cmdp->cmdtype = CMDNORMAL; - cmdp->param.index = idx; - INTON; - goto success; - } +#define stackblock() ((void *)stacknxt) +#define stackblocksize() stacknleft - /* We failed. If there was an entry for this command, delete it */ - if (cmdp && updatetbl) - delete_cmd_entry(); - if (act & DO_ERR) - sh_warnx("%s: %s", name, errmsg(e, E_EXEC)); - entry->cmdtype = CMDUNKNOWN; - return; +static void * +ckrealloc(void * p, size_t nbytes) +{ + p = realloc(p, nbytes); + if (!p) + ash_msg_and_raise_error(bb_msg_memory_exhausted); + return p; +} -builtin_success: - if (!updatetbl) { - entry->cmdtype = CMDBUILTIN; - entry->u.cmd = bcmd; - return; +static void * +ckmalloc(size_t nbytes) +{ + return ckrealloc(NULL, nbytes); +} + +/* + * Make a copy of a string in safe storage. + */ +static char * +ckstrdup(const char *s) +{ + char *p = strdup(s); + if (!p) + ash_msg_and_raise_error(bb_msg_memory_exhausted); + return p; +} + +/* + * Parse trees for commands are allocated in lifo order, so we use a stack + * to make this more efficient, and also to avoid all sorts of exception + * handling code to handle interrupts in the middle of a parse. + * + * The size 504 was chosen because the Ultrix malloc handles that size + * well. + */ +static void * +stalloc(size_t nbytes) +{ + char *p; + size_t aligned; + + aligned = SHELL_ALIGN(nbytes); + if (aligned > stacknleft) { + size_t len; + size_t blocksize; + struct stack_block *sp; + + blocksize = aligned; + if (blocksize < MINSIZE) + blocksize = MINSIZE; + len = sizeof(struct stack_block) - MINSIZE + blocksize; + if (len < blocksize) + ash_msg_and_raise_error(bb_msg_memory_exhausted); + INT_OFF; + sp = ckmalloc(len); + sp->prev = stackp; + stacknxt = sp->space; + stacknleft = blocksize; + sstrend = stacknxt + blocksize; + stackp = sp; + INT_ON; } - INTOFF; - cmdp = cmdlookup(name, 1); - cmdp->cmdtype = CMDBUILTIN; - cmdp->param.cmd = bcmd; - INTON; -success: - cmdp->rehash = 0; - entry->cmdtype = cmdp->cmdtype; - entry->u = cmdp->param; + p = stacknxt; + stacknxt += aligned; + stacknleft -= aligned; + return p; } - -/* - * Wrapper around strcmp for qsort/bsearch/... - */ -static int pstrcmp(const void *a, const void *b) +static void +stunalloc(void *p) { - return strcmp((const char *) a, (*(const char *const *) b) + 1); +#if DEBUG + if (!p || (stacknxt < (char *)p) || ((char *)p < stackp->space)) { + write(2, "stunalloc\n", 10); + abort(); + } +#endif + stacknleft += stacknxt - (char *)p; + stacknxt = p; } /* - * Search the table of builtin commands. + * Like strdup but works with the ash stack. */ - -static struct builtincmd * -find_builtin(const char *name) +static char * +ststrdup(const char *p) { - struct builtincmd *bp; - - bp = bsearch( - name, builtincmd, NUMBUILTINS, sizeof(struct builtincmd), - pstrcmp - ); - return bp; + size_t len = strlen(p) + 1; + return memcpy(stalloc(len), p, len); } - - -/* - * Called when a cd is done. Marks all commands so the next time they - * are executed they will be rehashed. - */ +static void +setstackmark(struct stackmark *mark) +{ + mark->stackp = stackp; + mark->stacknxt = stacknxt; + mark->stacknleft = stacknleft; + mark->marknext = markp; + markp = mark; +} static void -hashcd(void) +popstackmark(struct stackmark *mark) { - struct tblentry **pp; - struct tblentry *cmdp; + struct stack_block *sp; - for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) { - for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) { - if (cmdp->cmdtype == CMDNORMAL || ( - cmdp->cmdtype == CMDBUILTIN && - !(IS_BUILTIN_REGULAR(cmdp->param.cmd)) && - builtinloc > 0 - )) - cmdp->rehash = 1; - } + if (!mark->stackp) + return; + + INT_OFF; + markp = mark->marknext; + while (stackp != mark->stackp) { + sp = stackp; + stackp = sp->prev; + free(sp); } + stacknxt = mark->stacknxt; + stacknleft = mark->stacknleft; + sstrend = mark->stacknxt + mark->stacknleft; + INT_ON; } - - /* - * Fix command hash table when PATH changed. - * Called before PATH is changed. The argument is the new value of PATH; - * pathval() still returns the old value at this point. - * Called with interrupts off. + * When the parser reads in a string, it wants to stick the string on the + * stack and only adjust the stack pointer when it knows how big the + * string is. Stackblock (defined in stack.h) returns a pointer to a block + * of space on top of the stack and stackblocklen returns the length of + * this block. Growstackblock will grow this space by at least one byte, + * possibly moving it (like realloc). Grabstackblock actually allocates the + * part of the block that has been used. */ - static void -changepath(const char *newval) +growstackblock(void) { - const char *old, *new; - int idx; - int firstchange; - int idx_bltin; + size_t newlen; - old = pathval(); - new = newval; - firstchange = 9999; /* assume no change */ - idx = 0; - idx_bltin = -1; - for (;;) { - if (*old != *new) { - firstchange = idx; - if ((*old == '\0' && *new == ':') - || (*old == ':' && *new == '\0')) - firstchange++; - old = new; /* ignore subsequent differences */ - } - if (*new == '\0') - break; - if (*new == '%' && idx_bltin < 0 && prefix(new + 1, "builtin")) - idx_bltin = idx; - if (*new == ':') { - idx++; + newlen = stacknleft * 2; + if (newlen < stacknleft) + ash_msg_and_raise_error(bb_msg_memory_exhausted); + if (newlen < 128) + newlen += 128; + + if (stacknxt == stackp->space && stackp != &stackbase) { + struct stack_block *oldstackp; + struct stackmark *xmark; + struct stack_block *sp; + struct stack_block *prevstackp; + size_t grosslen; + + INT_OFF; + oldstackp = stackp; + sp = stackp; + prevstackp = sp->prev; + grosslen = newlen + sizeof(struct stack_block) - MINSIZE; + sp = ckrealloc(sp, grosslen); + sp->prev = prevstackp; + stackp = sp; + stacknxt = sp->space; + stacknleft = newlen; + sstrend = sp->space + newlen; + + /* + * Stack marks pointing to the start of the old block + * must be relocated to point to the new block + */ + xmark = markp; + while (xmark != NULL && xmark->stackp == oldstackp) { + xmark->stackp = stackp; + xmark->stacknxt = stacknxt; + xmark->stacknleft = stacknleft; + xmark = xmark->marknext; } - new++, old++; + INT_ON; + } else { + char *oldspace = stacknxt; + int oldlen = stacknleft; + char *p = stalloc(newlen); + + /* free the space we just allocated */ + stacknxt = memcpy(p, oldspace, oldlen); + stacknleft += newlen; } - if (builtinloc < 0 && idx_bltin >= 0) - builtinloc = idx_bltin; /* zap builtins */ - if (builtinloc >= 0 && idx_bltin < 0) - firstchange = 0; - clearcmdentry(firstchange); - builtinloc = idx_bltin; } +static void +grabstackblock(size_t len) +{ + len = SHELL_ALIGN(len); + stacknxt += len; + stacknleft -= len; +} /* - * Clear out command entries. The argument specifies the first entry in - * PATH which has changed. + * The following routines are somewhat easier to use than the above. + * The user declares a variable of type STACKSTR, which may be declared + * to be a register. The macro STARTSTACKSTR initializes things. Then + * the user uses the macro STPUTC to add characters to the string. In + * effect, STPUTC(c, p) is the same as *p++ = c except that the stack is + * grown as necessary. When the user is done, she can just leave the + * string there and refer to it using stackblock(). Or she can allocate + * the space for it using grabstackstr(). If it is necessary to allow + * someone else to use the stack temporarily and then continue to grow + * the string, the user should use grabstack to allocate the space, and + * then call ungrabstr(p) to return to the previous mode of operation. + * + * USTPUTC is like STPUTC except that it doesn't check for overflow. + * CHECKSTACKSPACE can be called before USTPUTC to ensure that there + * is space for at least one character. */ - -static void -clearcmdentry(int firstchange) +static void * +growstackstr(void) { - struct tblentry **tblp; - struct tblentry **pp; - struct tblentry *cmdp; - - INTOFF; - for (tblp = cmdtable ; tblp < &cmdtable[CMDTABLESIZE] ; tblp++) { - pp = tblp; - while ((cmdp = *pp) != NULL) { - if ((cmdp->cmdtype == CMDNORMAL && - cmdp->param.index >= firstchange) - || (cmdp->cmdtype == CMDBUILTIN && - builtinloc >= firstchange)) { - *pp = cmdp->next; - ckfree(cmdp); - } else { - pp = &cmdp->next; - } - } + size_t len = stackblocksize(); + if (herefd >= 0 && len >= 1024) { + full_write(herefd, stackblock(), len); + return stackblock(); } - INTON; + growstackblock(); + return stackblock() + len; } - - /* - * Locate a command in the command hash table. If "add" is nonzero, - * add the command to the table if it is not already present. The - * variable "lastcmdentry" is set to point to the address of the link - * pointing to the entry, so that delete_cmd_entry can delete the - * entry. - * - * Interrupts must be off if called with add != 0. + * Called from CHECKSTRSPACE. */ +static char * +makestrspace(size_t newlen, char *p) +{ + size_t len = p - stacknxt; + size_t size = stackblocksize(); -static struct tblentry **lastcmdentry; + for (;;) { + size_t nleft; + size = stackblocksize(); + nleft = size - len; + if (nleft >= newlen) + break; + growstackblock(); + } + return stackblock() + len; +} -static struct tblentry * -cmdlookup(const char *name, int add) +static char * +stack_nputstr(const char *s, size_t n, char *p) { - unsigned int hashval; - const char *p; - struct tblentry *cmdp; - struct tblentry **pp; + p = makestrspace(n, p); + p = memcpy(p, s, n) + n; + return p; +} - p = name; - hashval = (unsigned char)*p << 4; - while (*p) - hashval += (unsigned char)*p++; - hashval &= 0x7FFF; - pp = &cmdtable[hashval % CMDTABLESIZE]; - for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) { - if (equal(cmdp->cmdname, name)) - break; - pp = &cmdp->next; - } - if (add && cmdp == NULL) { - cmdp = *pp = ckmalloc(sizeof (struct tblentry) - ARB - + strlen(name) + 1); - cmdp->next = NULL; - cmdp->cmdtype = CMDUNKNOWN; - strcpy(cmdp->cmdname, name); - } - lastcmdentry = pp; - return cmdp; +static char * +stack_putstr(const char *s, char *p) +{ + return stack_nputstr(s, strlen(s), p); +} + +static char * +_STPUTC(int c, char *p) +{ + if (p == sstrend) + p = growstackstr(); + *p++ = c; + return p; } -/* - * Delete the command entry returned on the last lookup. - */ +#define STARTSTACKSTR(p) ((p) = stackblock()) +#define STPUTC(c, p) ((p) = _STPUTC((c), (p))) +#define CHECKSTRSPACE(n, p) \ + do { \ + char *q = (p); \ + size_t l = (n); \ + size_t m = sstrend - q; \ + if (l > m) \ + (p) = makestrspace(l, q); \ + } while (0) +#define USTPUTC(c, p) (*p++ = (c)) +#define STACKSTRNUL(p) \ + do { \ + if ((p) == sstrend) \ + p = growstackstr(); \ + *p = '\0'; \ + } while (0) +#define STUNPUTC(p) (--p) +#define STTOPC(p) (p[-1]) +#define STADJUST(amount, p) (p += (amount)) -static void -delete_cmd_entry(void) -{ - struct tblentry *cmdp; +#define grabstackstr(p) stalloc((char *)(p) - (char *)stackblock()) +#define ungrabstackstr(s, p) stunalloc((s)) +#define stackstrend() ((void *)sstrend) - INTOFF; - cmdp = *lastcmdentry; - *lastcmdentry = cmdp->next; - if (cmdp->cmdtype == CMDFUNCTION) - freefunc(cmdp->param.func); - ckfree(cmdp); - INTON; -} +/* ============ String helpers */ /* - * Add a new command entry, replacing any existing command entry for - * the same name - except special builtins. + * prefix -- see if pfx is a prefix of string. */ - -static void addcmdentry(char *name, struct cmdentry *entry) +static char * +prefix(const char *string, const char *pfx) { - struct tblentry *cmdp; - - cmdp = cmdlookup(name, 1); - if (cmdp->cmdtype == CMDFUNCTION) { - freefunc(cmdp->param.func); + while (*pfx) { + if (*pfx++ != *string++) + return 0; } - cmdp->cmdtype = entry->cmdtype; - cmdp->param = entry->u; - cmdp->rehash = 0; + return (char *) string; } /* - * Make a copy of a parse tree. + * Check for a valid number. This should be elsewhere. */ - -static struct funcnode * copyfunc(union node *n) +static int +is_number(const char *p) { - struct funcnode *f; - size_t blocksize; - - funcblocksize = offsetof(struct funcnode, n); - funcstringsize = 0; - calcsize(n); - blocksize = funcblocksize; - f = ckmalloc(blocksize + funcstringsize); - funcblock = (char *) f + offsetof(struct funcnode, n); - funcstring = (char *) f + blocksize; - copynode(n); - f->count = 0; - return f; + do { + if (!isdigit(*p)) + return 0; + } while (*++p != '\0'); + return 1; } /* - * Define a shell function. + * Convert a string of digits to an integer, printing an error message on + * failure. */ +static int +number(const char *s) +{ + if (!is_number(s)) + ash_msg_and_raise_error(illnum, s); + return atoi(s); +} -static void -defun(char *name, union node *func) +/* + * Produce a possibly single quoted string suitable as input to the shell. + * The return string is allocated on the stack. + */ +static char * +single_quote(const char *s) { - struct cmdentry entry; + char *p; - INTOFF; - entry.cmdtype = CMDFUNCTION; - entry.u.func = copyfunc(func); - addcmdentry(name, &entry); - INTON; + STARTSTACKSTR(p); + + do { + char *q; + size_t len; + + len = strchrnul(s, '\'') - s; + + q = p = makestrspace(len + 3, p); + + *q++ = '\''; + q = memcpy(q, s, len) + len; + *q++ = '\''; + s += len; + + STADJUST(q - p, p); + + len = strspn(s, "'"); + if (!len) + break; + + q = p = makestrspace(len + 3, p); + + *q++ = '"'; + q = memcpy(q, s, len) + len; + *q++ = '"'; + s += len; + + STADJUST(q - p, p); + } while (*s); + + USTPUTC(0, p); + + return stackblock(); } +/* ============ nextopt */ + +static char **argptr; /* argument list for builtin commands */ +static char *optionarg; /* set by nextopt (like getopt) */ +static char *optptr; /* used by nextopt */ + /* - * Delete a function if it exists. + * XXX - should get rid of. have all builtins use getopt(3). the + * library getopt must have the BSD extension static variable "optreset" + * otherwise it can't be used within the shell safely. + * + * Standard option processing (a la getopt) for builtin routines. The + * only argument that is passed to nextopt is the option string; the + * other arguments are unnecessary. It return the character, or '\0' on + * end of input. */ - -static void -unsetfunc(const char *name) +static int +nextopt(const char *optstring) { - struct tblentry *cmdp; + char *p; + const char *q; + char c; - if ((cmdp = cmdlookup(name, 0)) != NULL && - cmdp->cmdtype == CMDFUNCTION) - delete_cmd_entry(); + p = optptr; + if (p == NULL || *p == '\0') { + p = *argptr; + if (p == NULL || *p != '-' || *++p == '\0') + return '\0'; + argptr++; + if (LONE_DASH(p)) /* check for "--" */ + return '\0'; + } + c = *p++; + for (q = optstring; *q != c; ) { + if (*q == '\0') + ash_msg_and_raise_error("illegal option -%c", c); + if (*++q == ':') + q++; + } + if (*++q == ':') { + if (*p == '\0' && (p = *argptr++) == NULL) + ash_msg_and_raise_error("no arg for -%c option", c); + optionarg = p; + p = NULL; + } + optptr = p; + return c; } -/* - * Locate and print what a word is... - */ +/* ============ Math support definitions */ -#ifdef CONFIG_ASH_CMDCMD -static int -describe_command(char *command, int describe_command_verbose) +#if ENABLE_ASH_MATH_SUPPORT_64 +typedef int64_t arith_t; +#define arith_t_type long long #else -#define describe_command_verbose 1 -static int -describe_command(char *command) -#endif -{ - struct cmdentry entry; - struct tblentry *cmdp; -#ifdef CONFIG_ASH_ALIAS - const struct alias *ap; +typedef long arith_t; +#define arith_t_type long #endif - const char *path = pathval(); - if (describe_command_verbose) { - out1str(command); - } - - /* First look at the keywords */ - if (findkwd(command)) { - out1str(describe_command_verbose ? " is a shell keyword" : command); - goto out; - } +#if ENABLE_ASH_MATH_SUPPORT +static arith_t dash_arith(const char *); +static arith_t arith(const char *expr, int *perrcode); +#endif -#ifdef CONFIG_ASH_ALIAS - /* Then look at the aliases */ - if ((ap = lookupalias(command, 0)) != NULL) { - if (describe_command_verbose) { - out1fmt(" is an alias for %s", ap->val); - } else { - out1str("alias "); - printalias(ap); - return 0; - } - goto out; - } +#if ENABLE_ASH_RANDOM_SUPPORT +static unsigned long rseed; +#ifndef DYNAMIC_VAR +#define DYNAMIC_VAR +#endif #endif - /* Then check if it is a tracked alias */ - if ((cmdp = cmdlookup(command, 0)) != NULL) { - entry.cmdtype = cmdp->cmdtype; - entry.u = cmdp->param; - } else { - /* Finally use brute force */ - find_command(command, &entry, DO_ABS, path); - } - switch (entry.cmdtype) { - case CMDNORMAL: { - int j = entry.u.index; - char *p; - if (j == -1) { - p = command; - } else { - do { - p = padvance(&path, command); - stunalloc(p); - } while (--j >= 0); - } - if (describe_command_verbose) { - out1fmt(" is%s %s", - (cmdp ? " a tracked alias for" : nullstr), p - ); - } else { - out1str(p); - } - break; - } - case CMDFUNCTION: - if (describe_command_verbose) { - out1str(" is a shell function"); - } else { - out1str(command); - } - break; +/* ============ Shell variables */ - case CMDBUILTIN: - if (describe_command_verbose) { - out1fmt(" is a %sshell builtin", - IS_BUILTIN_SPECIAL(entry.u.cmd) ? - "special " : nullstr - ); - } else { - out1str(command); - } - break; +/* flags */ +#define VEXPORT 0x01 /* variable is exported */ +#define VREADONLY 0x02 /* variable cannot be modified */ +#define VSTRFIXED 0x04 /* variable struct is statically allocated */ +#define VTEXTFIXED 0x08 /* text is statically allocated */ +#define VSTACK 0x10 /* text is allocated on the stack */ +#define VUNSET 0x20 /* the variable is not set */ +#define VNOFUNC 0x40 /* don't call the callback function */ +#define VNOSET 0x80 /* do not set variable - just readonly test */ +#define VNOSAVE 0x100 /* when text is on the heap before setvareq */ +#ifdef DYNAMIC_VAR +# define VDYNAMIC 0x200 /* dynamic variable */ +#else +# define VDYNAMIC 0 +#endif - default: - if (describe_command_verbose) { - out1str(": not found\n"); - } - return 127; - } +#ifdef IFS_BROKEN +static const char defifsvar[] ALIGN1 = "IFS= \t\n"; +#define defifs (defifsvar + 4) +#else +static const char defifs[] ALIGN1 = " \t\n"; +#endif -out: - outstr("\n", stdout); - return 0; -} +struct shparam { + int nparam; /* # of positional parameters (without $0) */ + unsigned char malloc; /* if parameter list dynamically allocated */ + char **p; /* parameter list */ +#if ENABLE_ASH_GETOPTS + int optind; /* next parameter to be processed by getopts */ + int optoff; /* used by getopts */ +#endif +}; -static int -typecmd(int argc, char **argv) +static struct shparam shellparam; /* $@ current positional parameters */ + +/* + * Free the list of positional parameters. + */ +static void +freeparam(volatile struct shparam *param) { - int i; - int err = 0; + char **ap; - for (i = 1; i < argc; i++) { -#ifdef CONFIG_ASH_CMDCMD - err |= describe_command(argv[i], 1); -#else - err |= describe_command(argv[i]); -#endif + if (param->malloc) { + for (ap = param->p; *ap; ap++) + free(*ap); + free(param->p); } - return err; } -#ifdef CONFIG_ASH_CMDCMD -static int -commandcmd(int argc, char **argv) +#if ENABLE_ASH_GETOPTS +static void +getoptsreset(const char *value) { - int c; - enum { - VERIFY_BRIEF = 1, - VERIFY_VERBOSE = 2, - } verify = 0; - - while ((c = nextopt("pvV")) != '\0') - if (c == 'V') - verify |= VERIFY_VERBOSE; - else if (c == 'v') - verify |= VERIFY_BRIEF; -#if DEBUG - else if (c != 'p') - abort(); + shellparam.optind = number(value); + shellparam.optoff = -1; +} #endif - if (verify) - return describe_command(*argptr, verify - VERIFY_BRIEF); - return 0; +struct var { + struct var *next; /* next entry in hash list */ + int flags; /* flags are defined above */ + const char *text; /* name=value */ + void (*func)(const char *); /* function to be called when */ + /* the variable gets set/unset */ +}; + +struct localvar { + struct localvar *next; /* next local variable in list */ + struct var *vp; /* the variable that was made local */ + int flags; /* saved flags */ + const char *text; /* saved text */ +}; + +/* Forward decls for varinit[] */ +#if ENABLE_LOCALE_SUPPORT +static void +change_lc_all(const char *value) +{ + if (value && *value != '\0') + setlocale(LC_ALL, value); } +static void +change_lc_ctype(const char *value) +{ + if (value && *value != '\0') + setlocale(LC_CTYPE, value); +} +#endif +#if ENABLE_ASH_MAIL +static void chkmail(void); +static void changemail(const char *); +#endif +static void changepath(const char *); +#if ENABLE_ASH_RANDOM_SUPPORT +static void change_random(const char *); +#endif + +static struct var varinit[] = { +#ifdef IFS_BROKEN + { NULL, VSTRFIXED|VTEXTFIXED, defifsvar, NULL }, +#else + { NULL, VSTRFIXED|VTEXTFIXED|VUNSET, "IFS\0", NULL }, +#endif +#if ENABLE_ASH_MAIL + { NULL, VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL\0", changemail }, + { NULL, VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH\0", changemail }, #endif + { NULL, VSTRFIXED|VTEXTFIXED, bb_PATH_root_path, changepath }, + { NULL, VSTRFIXED|VTEXTFIXED, "PS1=$ ", NULL }, + { NULL, VSTRFIXED|VTEXTFIXED, "PS2=> ", NULL }, + { NULL, VSTRFIXED|VTEXTFIXED, "PS4=+ ", NULL }, +#if ENABLE_ASH_GETOPTS + { NULL, VSTRFIXED|VTEXTFIXED, "OPTIND=1", getoptsreset }, +#endif +#if ENABLE_ASH_RANDOM_SUPPORT + { NULL, VSTRFIXED|VTEXTFIXED|VUNSET|VDYNAMIC, "RANDOM\0", change_random }, +#endif +#if ENABLE_LOCALE_SUPPORT + { NULL, VSTRFIXED | VTEXTFIXED | VUNSET, "LC_ALL\0", change_lc_all }, + { NULL, VSTRFIXED | VTEXTFIXED | VUNSET, "LC_CTYPE\0", change_lc_ctype }, +#endif +#if ENABLE_FEATURE_EDITING_SAVEHISTORY + { NULL, VSTRFIXED | VTEXTFIXED | VUNSET, "HISTFILE\0", NULL }, +#endif +}; -/* expand.c */ +#define vifs varinit[0] +#if ENABLE_ASH_MAIL +#define vmail (&vifs)[1] +#define vmpath (&vmail)[1] +#else +#define vmpath vifs +#endif +#define vpath (&vmpath)[1] +#define vps1 (&vpath)[1] +#define vps2 (&vps1)[1] +#define vps4 (&vps2)[1] +#define voptind (&vps4)[1] +#if ENABLE_ASH_GETOPTS +#define vrandom (&voptind)[1] +#else +#define vrandom (&vps4)[1] +#endif /* - * Routines to expand arguments to commands. We have to deal with - * backquotes, shell variables, and file metacharacters. + * The following macros access the values of the above variables. + * They have to skip over the name. They return the null string + * for unset variables. */ +#define ifsval() (vifs.text + 4) +#define ifsset() ((vifs.flags & VUNSET) == 0) +#define mailval() (vmail.text + 5) +#define mpathval() (vmpath.text + 9) +#define pathval() (vpath.text + 5) +#define ps1val() (vps1.text + 4) +#define ps2val() (vps2.text + 4) +#define ps4val() (vps4.text + 4) +#define optindval() (voptind.text + 7) + +#define mpathset() ((vmpath.flags & VUNSET) == 0) /* - * _rmescape() flags + * The parsefile structure pointed to by the global variable parsefile + * contains information about the current file being read. */ -#define RMESCAPE_ALLOC 0x1 /* Allocate a new string */ -#define RMESCAPE_GLOB 0x2 /* Add backslashes for glob */ -#define RMESCAPE_QUOTED 0x4 /* Remove CTLESC unless in quotes */ -#define RMESCAPE_GROW 0x8 /* Grow strings instead of stalloc */ -#define RMESCAPE_HEAP 0x10 /* Malloc strings instead of stalloc */ +struct redirtab { + struct redirtab *next; + int renamed[10]; + int nullredirs; +}; + +static struct redirtab *redirlist; +static int nullredirs; +static int preverrout_fd; /* save fd2 before print debug if xflag is set. */ + +#define VTABSIZE 39 + +static struct var *vartab[VTABSIZE]; + +#define is_name(c) ((c) == '_' || isalpha((unsigned char)(c))) +#define is_in_name(c) ((c) == '_' || isalnum((unsigned char)(c))) /* - * Structure specifying which parts of the string should be searched - * for IFS characters. + * Return of a legal variable name (a letter or underscore followed by zero or + * more letters, underscores, and digits). */ +static char * +endofname(const char *name) +{ + char *p; -struct ifsregion { - struct ifsregion *next; /* next region in list */ - int begoff; /* offset of start of region */ - int endoff; /* offset of end of region */ - int nulonly; /* search for nul bytes only */ -}; + p = (char *) name; + if (!is_name(*p)) + return p; + while (*++p) { + if (!is_in_name(*p)) + break; + } + return p; +} -/* output of current string */ -static char *expdest; -/* list of back quote expressions */ -static struct nodelist *argbackq; -/* first struct in list of ifs regions */ -static struct ifsregion ifsfirst; -/* last struct in list */ -static struct ifsregion *ifslastp; -/* holds expanded arg list */ -static struct arglist exparg; +/* + * Compares two strings up to the first = or '\0'. The first + * string must be terminated by '='; the second may be terminated by + * either '=' or '\0'. + */ +static int +varcmp(const char *p, const char *q) +{ + int c, d; -static void argstr(char *, int); -static char *exptilde(char *, char *, int); -static void expbackq(union node *, int, int); -static const char *subevalvar(char *, char *, int, int, int, int, int); -static char *evalvar(char *, int); -static void strtodest(const char *, int, int); -static void memtodest(const char *p, size_t len, int syntax, int quotes); -static ssize_t varvalue(char *, int, int); -static void recordregion(int, int, int); -static void removerecordregions(int); -static void ifsbreakup(char *, struct arglist *); -static void ifsfree(void); -static void expandmeta(struct strlist *, int); -static int patmatch(char *, const char *); - -static int cvtnum(arith_t); -static size_t esclen(const char *, const char *); -static char *scanleft(char *, char *, char *, char *, int, int); -static char *scanright(char *, char *, char *, char *, int, int); -static void varunset(const char *, const char *, const char *, int) - ATTRIBUTE_NORETURN; + while ((c = *p) == (d = *q)) { + if (!c || c == '=') + goto out; + p++; + q++; + } + if (c == '=') + c = '\0'; + if (d == '=') + d = '\0'; + out: + return c - d; +} +static int +varequal(const char *a, const char *b) +{ + return !varcmp(a, b); +} -#define pmatch(a, b) !fnmatch((a), (b), 0) /* - * Prepare a pattern for a expmeta (internal glob(3)) call. - * - * Returns an stalloced string. + * Find the appropriate entry in the hash table from the name. */ +static struct var ** +hashvar(const char *p) +{ + unsigned hashval; -static char * preglob(const char *pattern, int quoted, int flag) { - flag |= RMESCAPE_GLOB; - if (quoted) { - flag |= RMESCAPE_QUOTED; - } - return _rmescapes((char *)pattern, flag); + hashval = ((unsigned char) *p) << 4; + while (*p && *p != '=') + hashval += (unsigned char) *p++; + return &vartab[hashval % VTABSIZE]; } +static int +vpcmp(const void *a, const void *b) +{ + return varcmp(*(const char **)a, *(const char **)b); +} -static size_t -esclen(const char *start, const char *p) { - size_t esc = 0; +/* + * This routine initializes the builtin variables. + */ +static void +initvar(void) +{ + struct var *vp; + struct var *end; + struct var **vpp; + + /* + * PS1 depends on uid + */ +#if ENABLE_FEATURE_EDITING && ENABLE_FEATURE_EDITING_FANCY_PROMPT + vps1.text = "PS1=\\w \\$ "; +#else + if (!geteuid()) + vps1.text = "PS1=# "; +#endif + vp = varinit; + end = vp + ARRAY_SIZE(varinit); + do { + vpp = hashvar(vp->text); + vp->next = *vpp; + *vpp = vp; + } while (++vp < end); +} - while (p > start && *--p == CTLESC) { - esc++; +static struct var ** +findvar(struct var **vpp, const char *name) +{ + for (; *vpp; vpp = &(*vpp)->next) { + if (varequal((*vpp)->text, name)) { + break; + } } - return esc; + return vpp; } - /* - * Expand shell variables and backquotes inside a here document. + * Find the value of a variable. Returns NULL if not set. */ - -static void expandhere(union node *arg, int fd) +static char * +lookupvar(const char *name) { - herefd = fd; - expandarg(arg, (struct arglist *)NULL, 0); - full_write(fd, stackblock(), expdest - (char *)stackblock()); -} + struct var *v; + v = *findvar(hashvar(name), name); + if (v) { +#ifdef DYNAMIC_VAR + /* + * Dynamic variables are implemented roughly the same way they are + * in bash. Namely, they're "special" so long as they aren't unset. + * As soon as they're unset, they're no longer dynamic, and dynamic + * lookup will no longer happen at that point. -- PFM. + */ + if ((v->flags & VDYNAMIC)) + (*v->func)(NULL); +#endif + if (!(v->flags & VUNSET)) + return strchrnul(v->text, '=') + 1; + } + return NULL; +} /* - * Perform variable substitution and command substitution on an argument, - * placing the resulting list of arguments in arglist. If EXP_FULL is true, - * perform splitting and file name expansion. When arglist is NULL, perform - * here document expansion. + * Search the environment of a builtin command. */ - -void -expandarg(union node *arg, struct arglist *arglist, int flag) +static char * +bltinlookup(const char *name) { struct strlist *sp; - char *p; - argbackq = arg->narg.backquote; - STARTSTACKSTR(expdest); - ifsfirst.next = NULL; - ifslastp = NULL; - argstr(arg->narg.text, flag); - p = _STPUTC('\0', expdest); - expdest = p - 1; - if (arglist == NULL) { - return; /* here document expanded */ - } - p = grabstackstr(p); - exparg.lastp = &exparg.list; - /* - * TODO - EXP_REDIR - */ - if (flag & EXP_FULL) { - ifsbreakup(p, &exparg); - *exparg.lastp = NULL; - exparg.lastp = &exparg.list; - expandmeta(exparg.list, flag); - } else { - if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */ - rmescapes(p); - sp = (struct strlist *)stalloc(sizeof (struct strlist)); - sp->text = p; - *exparg.lastp = sp; - exparg.lastp = &sp->next; - } - if (ifsfirst.next) - ifsfree(); - *exparg.lastp = NULL; - if (exparg.list) { - *arglist->lastp = exparg.list; - arglist->lastp = exparg.lastp; + for (sp = cmdenviron; sp; sp = sp->next) { + if (varequal(sp->text, name)) + return strchrnul(sp->text, '=') + 1; } + return lookupvar(name); } - /* - * Perform variable and command substitution. If EXP_FULL is set, output CTLESC - * characters to allow for further processing. Otherwise treat - * $@ like $* since no splitting will be performed. + * Same as setvar except that the variable and value are passed in + * the first argument as name=value. Since the first argument will + * be actually stored in the table, it should not be a string that + * will go away. + * Called with interrupts off. */ - static void -argstr(char *p, int flag) +setvareq(char *s, int flags) { - static const char spclchars[] = { - '=', - ':', - CTLQUOTEMARK, - CTLENDVAR, - CTLESC, - CTLVAR, - CTLBACKQ, - CTLBACKQ | CTLQUOTE, -#ifdef CONFIG_ASH_MATH_SUPPORT - CTLENDARI, -#endif - 0 - }; - const char *reject = spclchars; - int c; - int quotes = flag & (EXP_FULL | EXP_CASE); /* do CTLESC */ - int breakall = flag & EXP_WORD; - int inquotes; - size_t length; - int startloc; + struct var *vp, **vpp; - if (!(flag & EXP_VARTILDE)) { - reject += 2; - } else if (flag & EXP_VARTILDE2) { - reject++; - } - inquotes = 0; - length = 0; - if (flag & EXP_TILDE) { - char *q; + vpp = hashvar(s); + flags |= (VEXPORT & (((unsigned) (1 - aflag)) - 1)); + vp = *findvar(vpp, s); + if (vp) { + if ((vp->flags & (VREADONLY|VDYNAMIC)) == VREADONLY) { + const char *n; - flag &= ~EXP_TILDE; -tilde: - q = p; - if (*q == CTLESC && (flag & EXP_QWORD)) - q++; - if (*q == '~') - p = exptilde(p, q, flag); - } -start: - startloc = expdest - (char *)stackblock(); - for (;;) { - length += strcspn(p + length, reject); - c = p[length]; - if (c && (!(c & 0x80) -#ifdef CONFIG_ASH_MATH_SUPPORT - || c == CTLENDARI -#endif - )) { - /* c == '=' || c == ':' || c == CTLENDARI */ - length++; - } - if (length > 0) { - int newloc; - expdest = stnputs(p, length, expdest); - newloc = expdest - (char *)stackblock(); - if (breakall && !inquotes && newloc > startloc) { - recordregion(startloc, newloc, 0); - } - startloc = newloc; + if (flags & VNOSAVE) + free(s); + n = vp->text; + ash_msg_and_raise_error("%.*s: is read only", strchrnul(n, '=') - n, n); } - p += length + 1; - length = 0; - switch (c) { - case '\0': - goto breakloop; - case '=': - if (flag & EXP_VARTILDE2) { - p--; - continue; - } - flag |= EXP_VARTILDE2; - reject++; - /* fall through */ - case ':': - /* - * sort of a hack - expand tildes in variable - * assignments (after the first '=' and after ':'s). - */ - if (*--p == '~') { - goto tilde; - } - continue; - } + if (flags & VNOSET) + return; - switch (c) { - case CTLENDVAR: /* ??? */ - goto breakloop; - case CTLQUOTEMARK: - /* "$@" syntax adherence hack */ - if ( - !inquotes && - !memcmp(p, dolatstr, DOLATSTRLEN) && - (p[4] == CTLQUOTEMARK || ( - p[4] == CTLENDVAR && - p[5] == CTLQUOTEMARK - )) - ) { - p = evalvar(p + 1, flag) + 1; - goto start; - } - inquotes = !inquotes; -addquote: - if (quotes) { - p--; - length++; - startloc++; - } - break; - case CTLESC: - startloc++; - length++; - goto addquote; - case CTLVAR: - p = evalvar(p, flag); - goto start; - case CTLBACKQ: - c = 0; - case CTLBACKQ|CTLQUOTE: - expbackq(argbackq->n, c, quotes); - argbackq = argbackq->next; - goto start; -#ifdef CONFIG_ASH_MATH_SUPPORT - case CTLENDARI: - p--; - expari(quotes); - goto start; -#endif - } + if (vp->func && (flags & VNOFUNC) == 0) + (*vp->func)(strchrnul(s, '=') + 1); + + if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0) + free((char*)vp->text); + + flags |= vp->flags & ~(VTEXTFIXED|VSTACK|VNOSAVE|VUNSET); + } else { + if (flags & VNOSET) + return; + /* not found */ + vp = ckmalloc(sizeof(*vp)); + vp->next = *vpp; + vp->func = NULL; + *vpp = vp; + } + if (!(flags & (VTEXTFIXED|VSTACK|VNOSAVE))) + s = ckstrdup(s); + vp->text = s; + vp->flags = flags; +} + +/* + * Set the value of a variable. The flags argument is ored with the + * flags of the variable. If val is NULL, the variable is unset. + */ +static void +setvar(const char *name, const char *val, int flags) +{ + char *p, *q; + size_t namelen; + char *nameeq; + size_t vallen; + + q = endofname(name); + p = strchrnul(q, '='); + namelen = p - name; + if (!namelen || p != q) + ash_msg_and_raise_error("%.*s: bad variable name", namelen, name); + vallen = 0; + if (val == NULL) { + flags |= VUNSET; + } else { + vallen = strlen(val); } -breakloop: - ; + INT_OFF; + nameeq = ckmalloc(namelen + vallen + 2); + p = memcpy(nameeq, name, namelen) + namelen; + if (val) { + *p++ = '='; + p = memcpy(p, val, vallen) + vallen; + } + *p = '\0'; + setvareq(nameeq, flags | VNOSAVE); + INT_ON; } -static char * -exptilde(char *startp, char *p, int flag) +#if ENABLE_ASH_GETOPTS +/* + * Safe version of setvar, returns 1 on success 0 on failure. + */ +static int +setvarsafe(const char *name, const char *val, int flags) { - char c; - char *name; - struct passwd *pw; - const char *home; - int quotes = flag & (EXP_FULL | EXP_CASE); - int startloc; + int err; + volatile int saveint; + struct jmploc *volatile savehandler = exception_handler; + struct jmploc jmploc; - name = p + 1; + SAVE_INT(saveint); + if (setjmp(jmploc.loc)) + err = 1; + else { + exception_handler = &jmploc; + setvar(name, val, flags); + err = 0; + } + exception_handler = savehandler; + RESTORE_INT(saveint); + return err; +} +#endif - while ((c = *++p) != '\0') { - switch(c) { - case CTLESC: - return startp; - case CTLQUOTEMARK: - return startp; - case ':': - if (flag & EXP_VARTILDE) - goto done; - break; - case '/': - case CTLENDVAR: - goto done; +/* + * Unset the specified variable. + */ +static int +unsetvar(const char *s) +{ + struct var **vpp; + struct var *vp; + int retval; + + vpp = findvar(hashvar(s), s); + vp = *vpp; + retval = 2; + if (vp) { + int flags = vp->flags; + + retval = 1; + if (flags & VREADONLY) + goto out; +#ifdef DYNAMIC_VAR + vp->flags &= ~VDYNAMIC; +#endif + if (flags & VUNSET) + goto ok; + if ((flags & VSTRFIXED) == 0) { + INT_OFF; + if ((flags & (VTEXTFIXED|VSTACK)) == 0) + free((char*)vp->text); + *vpp = vp->next; + free(vp); + INT_ON; + } else { + setvar(s, 0, 0); + vp->flags &= ~VEXPORT; } + ok: + retval = 0; } -done: - *p = '\0'; - if (*name == '\0') { - home = lookupvar(homestr); - } else { - if ((pw = getpwnam(name)) == NULL) - goto lose; - home = pw->pw_dir; - } - if (!home || !*home) - goto lose; - *p = c; - startloc = expdest - (char *)stackblock(); - strtodest(home, SQSYNTAX, quotes); - recordregion(startloc, expdest - (char *)stackblock(), 0); - return p; -lose: - *p = c; - return startp; + out: + return retval; } - +/* + * Process a linked list of variable assignments. + */ static void -removerecordregions(int endoff) +listsetvar(struct strlist *list_set_var, int flags) { - if (ifslastp == NULL) - return; + struct strlist *lp = list_set_var; - if (ifsfirst.endoff > endoff) { - while (ifsfirst.next != NULL) { - struct ifsregion *ifsp; - INTOFF; - ifsp = ifsfirst.next->next; - ckfree(ifsfirst.next); - ifsfirst.next = ifsp; - INTON; - } - if (ifsfirst.begoff > endoff) - ifslastp = NULL; - else { - ifslastp = &ifsfirst; - ifsfirst.endoff = endoff; - } + if (!lp) return; - } - - ifslastp = &ifsfirst; - while (ifslastp->next && ifslastp->next->begoff < endoff) - ifslastp=ifslastp->next; - while (ifslastp->next != NULL) { - struct ifsregion *ifsp; - INTOFF; - ifsp = ifslastp->next->next; - ckfree(ifslastp->next); - ifslastp->next = ifsp; - INTON; - } - if (ifslastp->endoff > endoff) - ifslastp->endoff = endoff; + INT_OFF; + do { + setvareq(lp->text, flags); + lp = lp->next; + } while (lp); + INT_ON; } - -#ifdef CONFIG_ASH_MATH_SUPPORT /* - * Expand arithmetic expression. Backup to start of expression, - * evaluate, place result in (backed up) result, adjust string position. + * Generate a list of variables satisfying the given conditions. */ -void -expari(int quotes) +static char ** +listvars(int on, int off, char ***end) { - char *p, *start; - int begoff; - int flag; - int len; - - /* ifsfree(); */ + struct var **vpp; + struct var *vp; + char **ep; + int mask; - /* - * This routine is slightly over-complicated for - * efficiency. Next we scan backwards looking for the - * start of arithmetic. - */ - start = stackblock(); - p = expdest - 1; - *p = '\0'; - p--; + STARTSTACKSTR(ep); + vpp = vartab; + mask = on | off; do { - int esc; - - while (*p != CTLARI) { - p--; -#if DEBUG - if (p < start) { - sh_error("missing CTLARI (shouldn't happen)"); + for (vp = *vpp; vp; vp = vp->next) { + if ((vp->flags & mask) == on) { + if (ep == stackstrend()) + ep = growstackstr(); + *ep++ = (char *) vp->text; } -#endif - } - - esc = esclen(start, p); - if (!(esc % 2)) { - break; } + } while (++vpp < vartab + VTABSIZE); + if (ep == stackstrend()) + ep = growstackstr(); + if (end) + *end = ep; + *ep++ = NULL; + return grabstackstr(ep); +} - p -= esc + 1; - } while (1); - begoff = p - start; +/* ============ Path search helper + * + * The variable path (passed by reference) should be set to the start + * of the path before the first call; padvance will update + * this value as it proceeds. Successive calls to padvance will return + * the possible path expansions in sequence. If an option (indicated by + * a percent sign) appears in the path entry then the global variable + * pathopt will be set to point to it; otherwise pathopt will be set to + * NULL. + */ +static const char *pathopt; /* set by padvance */ - removerecordregions(begoff); +static char * +padvance(const char **path, const char *name) +{ + const char *p; + char *q; + const char *start; + size_t len; - flag = p[1]; + if (*path == NULL) + return NULL; + start = *path; + for (p = start; *p && *p != ':' && *p != '%'; p++); + len = p - start + strlen(name) + 2; /* "2" is for '/' and '\0' */ + while (stackblocksize() < len) + growstackblock(); + q = stackblock(); + if (p != start) { + memcpy(q, start, p - start); + q += p - start; + *q++ = '/'; + } + strcpy(q, name); + pathopt = NULL; + if (*p == '%') { + pathopt = ++p; + while (*p && *p != ':') p++; + } + if (*p == ':') + *path = p + 1; + else + *path = NULL; + return stalloc(len); +} - expdest = p; - if (quotes) - rmescapes(p + 2); +/* ============ Prompt */ - len = cvtnum(dash_arith(p + 2)); +static smallint doprompt; /* if set, prompt the user */ +static smallint needprompt; /* true if interactive and at start of line */ - if (flag != '"') - recordregion(begoff, begoff + len, 0); +#if ENABLE_FEATURE_EDITING +static line_input_t *line_input_state; +static const char *cmdedit_prompt; +static void +putprompt(const char *s) +{ + if (ENABLE_ASH_EXPAND_PRMT) { + free((char*)cmdedit_prompt); + cmdedit_prompt = ckstrdup(s); + return; + } + cmdedit_prompt = s; +} +#else +static void +putprompt(const char *s) +{ + out2str(s); } #endif -/* - * Expand stuff in backwards quotes. - */ - +#if ENABLE_ASH_EXPAND_PRMT +/* expandstr() needs parsing machinery, so it is far away ahead... */ +static const char *expandstr(const char *ps); +#else +#define expandstr(s) s +#endif + static void -expbackq(union node *cmd, int quoted, int quotes) +setprompt(int whichprompt) { - struct backcmd in; - int i; - char buf[128]; - char *p; - char *dest; - int startloc; - int syntax = quoted? DQSYNTAX : BASESYNTAX; + const char *prompt; +#if ENABLE_ASH_EXPAND_PRMT struct stackmark smark; +#endif + + needprompt = 0; - INTOFF; + switch (whichprompt) { + case 1: + prompt = ps1val(); + break; + case 2: + prompt = ps2val(); + break; + default: /* 0 */ + prompt = nullstr; + } +#if ENABLE_ASH_EXPAND_PRMT setstackmark(&smark); - dest = expdest; - startloc = dest - (char *)stackblock(); - grabstackstr(dest); - evalbackcmd(cmd, (struct backcmd *) &in); + stalloc(stackblocksize()); +#endif + putprompt(expandstr(prompt)); +#if ENABLE_ASH_EXPAND_PRMT popstackmark(&smark); +#endif +} - p = in.buf; - i = in.nleft; - if (i == 0) - goto read; - for (;;) { - memtodest(p, i, syntax, quotes); -read: - if (in.fd < 0) - break; - i = safe_read(in.fd, buf, sizeof buf); - TRACE(("expbackq: read returns %d\n", i)); - if (i <= 0) - break; - p = buf; - } - if (in.buf) - ckfree(in.buf); - if (in.fd >= 0) { - close(in.fd); - back_exitstatus = waitforjob(in.jp); - } - INTON; +/* ============ The cd and pwd commands */ - /* Eat all trailing newlines */ - dest = expdest; - for (; dest > (char *)stackblock() && dest[-1] == '\n';) - STUNPUTC(dest); - expdest = dest; +#define CD_PHYSICAL 1 +#define CD_PRINT 2 - if (quoted == 0) - recordregion(startloc, dest - (char *)stackblock(), 0); - TRACE(("evalbackq: size=%d: \"%.*s\"\n", - (dest - (char *)stackblock()) - startloc, - (dest - (char *)stackblock()) - startloc, - stackblock() + startloc)); -} +static int docd(const char *, int); +static char *curdir = nullstr; /* current working directory */ +static char *physdir = nullstr; /* physical working directory */ -static char * -scanleft(char *startp, char *rmesc, char *rmescend, char *str, int quotes, - int zero) +static int +cdopt(void) { - char *loc; - char *loc2; - char c; + int flags = 0; + int i, j; - loc = startp; - loc2 = rmesc; - do { - int match; - const char *s = loc2; - c = *loc2; - if (zero) { - *loc2 = '\0'; - s = rmesc; + j = 'L'; + while ((i = nextopt("LP"))) { + if (i != j) { + flags ^= CD_PHYSICAL; + j = i; } - match = pmatch(str, s); - *loc2 = c; - if (match) - return loc; - if (quotes && *loc == CTLESC) - loc++; - loc++; - loc2++; - } while (c); - return 0; -} + } + return flags; +} -static char * -scanright(char *startp, char *rmesc, char *rmescend, char *str, int quotes, - int zero) +/* + * Update curdir (the name of the current directory) in response to a + * cd command. + */ +static const char * +updatepwd(const char *dir) { - int esc = 0; - char *loc; - char *loc2; + char *new; + char *p; + char *cdcomppath; + const char *lim; - for (loc = str - 1, loc2 = rmescend; loc >= startp; loc2--) { - int match; - char c = *loc2; - const char *s = loc2; - if (zero) { - *loc2 = '\0'; - s = rmesc; + cdcomppath = ststrdup(dir); + STARTSTACKSTR(new); + if (*dir != '/') { + if (curdir == nullstr) + return 0; + new = stack_putstr(curdir, new); + } + new = makestrspace(strlen(dir) + 2, new); + lim = stackblock() + 1; + if (*dir != '/') { + if (new[-1] != '/') + USTPUTC('/', new); + if (new > lim && *lim == '/') + lim++; + } else { + USTPUTC('/', new); + cdcomppath++; + if (dir[1] == '/' && dir[2] != '/') { + USTPUTC('/', new); + cdcomppath++; + lim++; } - match = pmatch(str, s); - *loc2 = c; - if (match) - return loc; - loc--; - if (quotes) { - if (--esc < 0) { - esc = esclen(startp, loc); - } - if (esc % 2) { - esc--; - loc--; + } + p = strtok(cdcomppath, "/"); + while (p) { + switch (*p) { + case '.': + if (p[1] == '.' && p[2] == '\0') { + while (new > lim) { + STUNPUTC(new); + if (new[-1] == '/') + break; + } + break; } + if (p[1] == '\0') + break; + /* fall through */ + default: + new = stack_putstr(p, new); + USTPUTC('/', new); } + p = strtok(0, "/"); } - return 0; + if (new > lim) + STUNPUTC(new); + *new = 0; + return stackblock(); } -static const char * -subevalvar(char *p, char *str, int strloc, int subtype, int startloc, int varflags, int quotes) +/* + * Find out what the current directory is. If we already know the current + * directory, this routine returns immediately. + */ +static char * +getpwd(void) { - char *startp; - char *loc; - int saveherefd = herefd; - struct nodelist *saveargbackq = argbackq; - int amount; - char *rmesc, *rmescend; - int zero; - char *(*scan)(char *, char *, char *, char *, int , int); - - herefd = -1; - argstr(p, subtype != VSASSIGN && subtype != VSQUESTION ? EXP_CASE : 0); - STPUTC('\0', expdest); - herefd = saveherefd; - argbackq = saveargbackq; - startp = stackblock() + startloc; - - switch (subtype) { - case VSASSIGN: - setvar(str, startp, 0); - amount = startp - expdest; - STADJUST(amount, expdest); - return startp; - - case VSQUESTION: - varunset(p, str, startp, varflags); - /* NOTREACHED */ - } - - subtype -= VSTRIMRIGHT; -#if DEBUG - if (subtype < 0 || subtype > 3) - abort(); -#endif + char *dir = getcwd(0, 0); + return dir ? dir : nullstr; +} - rmesc = startp; - rmescend = stackblock() + strloc; - if (quotes) { - rmesc = _rmescapes(startp, RMESCAPE_ALLOC | RMESCAPE_GROW); - if (rmesc != startp) { - rmescend = expdest; - startp = stackblock() + startloc; - } - } - rmescend--; - str = stackblock() + strloc; - preglob(str, varflags & VSQUOTE, 0); +static void +setpwd(const char *val, int setold) +{ + char *oldcur, *dir; - /* zero = subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX */ - zero = subtype >> 1; - /* VSTRIMLEFT/VSTRIMRIGHTMAX -> scanleft */ - scan = (subtype & 1) ^ zero ? scanleft : scanright; + oldcur = dir = curdir; - loc = scan(startp, rmesc, rmescend, str, quotes, zero); - if (loc) { - if (zero) { - memmove(startp, loc, str - loc); - loc = startp + (str - loc) - 1; - } - *loc = '\0'; - amount = loc - expdest; - STADJUST(amount, expdest); + if (setold) { + setvar("OLDPWD", oldcur, VEXPORT); } - return loc; + INT_OFF; + if (physdir != nullstr) { + if (physdir != oldcur) + free(physdir); + physdir = nullstr; + } + if (oldcur == val || !val) { + char *s = getpwd(); + physdir = s; + if (!val) + dir = s; + } else + dir = ckstrdup(val); + if (oldcur != dir && oldcur != nullstr) { + free(oldcur); + } + curdir = dir; + INT_ON; + setvar("PWD", dir, VEXPORT); } +static void hashcd(void); /* - * Expand a variable, and return a pointer to the next character in the - * input string. + * Actually do the chdir. We also call hashcd to let the routines in exec.c + * know that the current directory has changed. */ -static char * -evalvar(char *p, int flag) +static int +docd(const char *dest, int flags) { - int subtype; - int varflags; - char *var; - int patloc; - int c; - int startloc; - ssize_t varlen; - int easy; - int quotes; - int quoted; - - quotes = flag & (EXP_FULL | EXP_CASE); - varflags = *p++; - subtype = varflags & VSTYPE; - quoted = varflags & VSQUOTE; - var = p; - easy = (!quoted || (*var == '@' && shellparam.nparam)); - startloc = expdest - (char *)stackblock(); - p = strchr(p, '=') + 1; + const char *dir = 0; + int err; -again: - varlen = varvalue(var, varflags, flag); - if (varflags & VSNUL) - varlen--; + TRACE(("docd(\"%s\", %d) called\n", dest, flags)); - if (subtype == VSPLUS) { - varlen = -1 - varlen; - goto vsplus; + INT_OFF; + if (!(flags & CD_PHYSICAL)) { + dir = updatepwd(dest); + if (dir) + dest = dir; } + err = chdir(dest); + if (err) + goto out; + setpwd(dir, 1); + hashcd(); + out: + INT_ON; + return err; +} - if (subtype == VSMINUS) { -vsplus: - if (varlen < 0) { - argstr( - p, flag | EXP_TILDE | - (quoted ? EXP_QWORD : EXP_WORD) - ); - goto end; - } - if (easy) - goto record; - goto end; - } +static int +cdcmd(int argc, char **argv) +{ + const char *dest; + const char *path; + const char *p; + char c; + struct stat statb; + int flags; - if (subtype == VSASSIGN || subtype == VSQUESTION) { - if (varlen < 0) { - if (subevalvar(p, var, 0, subtype, startloc, - varflags, 0)) { - varflags &= ~VSNUL; - /* - * Remove any recorded regions beyond - * start of variable - */ - removerecordregions(startloc); - goto again; - } - goto end; + flags = cdopt(); + dest = *argptr; + if (!dest) + dest = bltinlookup(homestr); + else if (LONE_DASH(dest)) { + dest = bltinlookup("OLDPWD"); + flags |= CD_PRINT; + } + if (!dest) + dest = nullstr; + if (*dest == '/') + goto step7; + if (*dest == '.') { + c = dest[1]; + dotdot: + switch (c) { + case '\0': + case '/': + goto step6; + case '.': + c = dest[2]; + if (c != '.') + goto dotdot; } - if (easy) - goto record; - goto end; } + if (!*dest) + dest = "."; + path = bltinlookup("CDPATH"); + if (!path) { + step6: + step7: + p = dest; + goto docd; + } + do { + c = *path; + p = padvance(&path, dest); + if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) { + if (c && c != ':') + flags |= CD_PRINT; + docd: + if (!docd(p, flags)) + goto out; + break; + } + } while (path); + ash_msg_and_raise_error("can't cd to %s", dest); + /* NOTREACHED */ + out: + if (flags & CD_PRINT) + out1fmt(snlfmt, curdir); + return 0; +} - if (varlen < 0 && uflag) - varunset(p, var, 0, 0); +static int +pwdcmd(int argc, char **argv) +{ + int flags; + const char *dir = curdir; - if (subtype == VSLENGTH) { - cvtnum(varlen > 0 ? varlen : 0); - goto record; + flags = cdopt(); + if (flags) { + if (physdir == nullstr) + setpwd(dir, 0); + dir = physdir; } + out1fmt(snlfmt, dir); + return 0; +} - if (subtype == VSNORMAL) { - if (!easy) - goto end; -record: - recordregion(startloc, expdest - (char *)stackblock(), quoted); - goto end; - } -#if DEBUG - switch (subtype) { - case VSTRIMLEFT: - case VSTRIMLEFTMAX: - case VSTRIMRIGHT: - case VSTRIMRIGHTMAX: - break; - default: - abort(); - } -#endif +/* ============ ... */ - if (varlen >= 0) { - /* - * Terminate the string and start recording the pattern - * right after it - */ - STPUTC('\0', expdest); - patloc = expdest - (char *)stackblock(); - if (subevalvar(p, NULL, patloc, subtype, - startloc, varflags, quotes) == 0) { - int amount = expdest - ( - (char *)stackblock() + patloc - 1 - ); - STADJUST(-amount, expdest); - } - /* Remove any recorded regions beyond start of variable */ - removerecordregions(startloc); - goto record; - } +#define IBUFSIZ COMMON_BUFSIZE +#define basebuf bb_common_bufsiz1 /* buffer for top level input file */ -end: - if (subtype != VSNORMAL) { /* skip to end of alternative */ - int nesting = 1; - for (;;) { - if ((c = *p++) == CTLESC) - p++; - else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) { - if (varlen >= 0) - argbackq = argbackq->next; - } else if (c == CTLVAR) { - if ((*p++ & VSTYPE) != VSNORMAL) - nesting++; - } else if (c == CTLENDVAR) { - if (--nesting == 0) - break; - } - } - } - return p; -} +/* Syntax classes */ +#define CWORD 0 /* character is nothing special */ +#define CNL 1 /* newline character */ +#define CBACK 2 /* a backslash character */ +#define CSQUOTE 3 /* single quote */ +#define CDQUOTE 4 /* double quote */ +#define CENDQUOTE 5 /* a terminating quote */ +#define CBQUOTE 6 /* backwards single quote */ +#define CVAR 7 /* a dollar sign */ +#define CENDVAR 8 /* a '}' character */ +#define CLP 9 /* a left paren in arithmetic */ +#define CRP 10 /* a right paren in arithmetic */ +#define CENDFILE 11 /* end of file */ +#define CCTL 12 /* like CWORD, except it must be escaped */ +#define CSPCL 13 /* these terminate a word */ +#define CIGN 14 /* character should be ignored */ +#if ENABLE_ASH_ALIAS +#define SYNBASE 130 +#define PEOF -130 +#define PEOA -129 +#define PEOA_OR_PEOF PEOA +#else +#define SYNBASE 129 +#define PEOF -129 +#define PEOA_OR_PEOF PEOF +#endif -/* - * Put a string on the stack. - */ +/* number syntax index */ +#define BASESYNTAX 0 /* not in quotes */ +#define DQSYNTAX 1 /* in double quotes */ +#define SQSYNTAX 2 /* in single quotes */ +#define ARISYNTAX 3 /* in arithmetic */ +#define PSSYNTAX 4 /* prompt */ -static void -memtodest(const char *p, size_t len, int syntax, int quotes) { - char *q = expdest; +#if ENABLE_ASH_OPTIMIZE_FOR_SIZE +#define USE_SIT_FUNCTION +#endif - q = makestrspace(len * 2, q); +#if ENABLE_ASH_MATH_SUPPORT +static const char S_I_T[][4] = { +#if ENABLE_ASH_ALIAS + { CSPCL, CIGN, CIGN, CIGN }, /* 0, PEOA */ +#endif + { CSPCL, CWORD, CWORD, CWORD }, /* 1, ' ' */ + { CNL, CNL, CNL, CNL }, /* 2, \n */ + { CWORD, CCTL, CCTL, CWORD }, /* 3, !*-/:=?[]~ */ + { CDQUOTE, CENDQUOTE, CWORD, CWORD }, /* 4, '"' */ + { CVAR, CVAR, CWORD, CVAR }, /* 5, $ */ + { CSQUOTE, CWORD, CENDQUOTE, CWORD }, /* 6, "'" */ + { CSPCL, CWORD, CWORD, CLP }, /* 7, ( */ + { CSPCL, CWORD, CWORD, CRP }, /* 8, ) */ + { CBACK, CBACK, CCTL, CBACK }, /* 9, \ */ + { CBQUOTE, CBQUOTE, CWORD, CBQUOTE }, /* 10, ` */ + { CENDVAR, CENDVAR, CWORD, CENDVAR }, /* 11, } */ +#ifndef USE_SIT_FUNCTION + { CENDFILE, CENDFILE, CENDFILE, CENDFILE }, /* 12, PEOF */ + { CWORD, CWORD, CWORD, CWORD }, /* 13, 0-9A-Za-z */ + { CCTL, CCTL, CCTL, CCTL } /* 14, CTLESC ... */ +#endif +}; +#else +static const char S_I_T[][3] = { +#if ENABLE_ASH_ALIAS + { CSPCL, CIGN, CIGN }, /* 0, PEOA */ +#endif + { CSPCL, CWORD, CWORD }, /* 1, ' ' */ + { CNL, CNL, CNL }, /* 2, \n */ + { CWORD, CCTL, CCTL }, /* 3, !*-/:=?[]~ */ + { CDQUOTE, CENDQUOTE, CWORD }, /* 4, '"' */ + { CVAR, CVAR, CWORD }, /* 5, $ */ + { CSQUOTE, CWORD, CENDQUOTE }, /* 6, "'" */ + { CSPCL, CWORD, CWORD }, /* 7, ( */ + { CSPCL, CWORD, CWORD }, /* 8, ) */ + { CBACK, CBACK, CCTL }, /* 9, \ */ + { CBQUOTE, CBQUOTE, CWORD }, /* 10, ` */ + { CENDVAR, CENDVAR, CWORD }, /* 11, } */ +#ifndef USE_SIT_FUNCTION + { CENDFILE, CENDFILE, CENDFILE }, /* 12, PEOF */ + { CWORD, CWORD, CWORD }, /* 13, 0-9A-Za-z */ + { CCTL, CCTL, CCTL } /* 14, CTLESC ... */ +#endif +}; +#endif /* ASH_MATH_SUPPORT */ - while (len--) { - int c = SC2INT(*p++); - if (!c) - continue; - if (quotes && (SIT(c, syntax) == CCTL || SIT(c, syntax) == CBACK)) - USTPUTC(CTLESC, q); - USTPUTC(c, q); - } +#ifdef USE_SIT_FUNCTION - expdest = q; -} +static int +SIT(int c, int syntax) +{ + static const char spec_symbls[] ALIGN1 = "\t\n !\"$&'()*-/:;<=>?[\\]`|}~"; +#if ENABLE_ASH_ALIAS + static const char syntax_index_table[] ALIGN1 = { + 1, 2, 1, 3, 4, 5, 1, 6, /* "\t\n !\"$&'" */ + 7, 8, 3, 3, 3, 3, 1, 1, /* "()*-/:;<" */ + 3, 1, 3, 3, 9, 3, 10, 1, /* "=>?[\\]`|" */ + 11, 3 /* "}~" */ + }; +#else + static const char syntax_index_table[] ALIGN1 = { + 0, 1, 0, 2, 3, 4, 0, 5, /* "\t\n !\"$&'" */ + 6, 7, 2, 2, 2, 2, 0, 0, /* "()*-/:;<" */ + 2, 0, 2, 2, 8, 2, 9, 0, /* "=>?[\\]`|" */ + 10, 2 /* "}~" */ + }; +#endif + const char *s; + int indx; + if (c == PEOF) /* 2^8+2 */ + return CENDFILE; +#if ENABLE_ASH_ALIAS + if (c == PEOA) /* 2^8+1 */ + indx = 0; + else +#endif +#define U_C(c) ((unsigned char)(c)) -static void -strtodest(const char *p, int syntax, int quotes) -{ - memtodest(p, strlen(p), syntax, quotes); + if ((unsigned char)c >= (unsigned char)(CTLESC) + && (unsigned char)c <= (unsigned char)(CTLQUOTEMARK) + ) { + return CCTL; + } else { + s = strchr(spec_symbls, c); + if (s == NULL || *s == '\0') + return CWORD; + indx = syntax_index_table[(s - spec_symbls)]; + } + return S_I_T[indx][syntax]; } +#else /* !USE_SIT_FUNCTION */ + +#if ENABLE_ASH_ALIAS +#define CSPCL_CIGN_CIGN_CIGN 0 +#define CSPCL_CWORD_CWORD_CWORD 1 +#define CNL_CNL_CNL_CNL 2 +#define CWORD_CCTL_CCTL_CWORD 3 +#define CDQUOTE_CENDQUOTE_CWORD_CWORD 4 +#define CVAR_CVAR_CWORD_CVAR 5 +#define CSQUOTE_CWORD_CENDQUOTE_CWORD 6 +#define CSPCL_CWORD_CWORD_CLP 7 +#define CSPCL_CWORD_CWORD_CRP 8 +#define CBACK_CBACK_CCTL_CBACK 9 +#define CBQUOTE_CBQUOTE_CWORD_CBQUOTE 10 +#define CENDVAR_CENDVAR_CWORD_CENDVAR 11 +#define CENDFILE_CENDFILE_CENDFILE_CENDFILE 12 +#define CWORD_CWORD_CWORD_CWORD 13 +#define CCTL_CCTL_CCTL_CCTL 14 +#else +#define CSPCL_CWORD_CWORD_CWORD 0 +#define CNL_CNL_CNL_CNL 1 +#define CWORD_CCTL_CCTL_CWORD 2 +#define CDQUOTE_CENDQUOTE_CWORD_CWORD 3 +#define CVAR_CVAR_CWORD_CVAR 4 +#define CSQUOTE_CWORD_CENDQUOTE_CWORD 5 +#define CSPCL_CWORD_CWORD_CLP 6 +#define CSPCL_CWORD_CWORD_CRP 7 +#define CBACK_CBACK_CCTL_CBACK 8 +#define CBQUOTE_CBQUOTE_CWORD_CBQUOTE 9 +#define CENDVAR_CENDVAR_CWORD_CENDVAR 10 +#define CENDFILE_CENDFILE_CENDFILE_CENDFILE 11 +#define CWORD_CWORD_CWORD_CWORD 12 +#define CCTL_CCTL_CCTL_CCTL 13 +#endif -/* - * Add the value of a specialized variable to the stack string. - */ - -static ssize_t -varvalue(char *name, int varflags, int flags) -{ - int num; - char *p; - int i; - int sep = 0; - int sepq = 0; - ssize_t len = 0; - char **ap; - int syntax; - int quoted = varflags & VSQUOTE; - int subtype = varflags & VSTYPE; - int quotes = flags & (EXP_FULL | EXP_CASE); +static const char syntax_index_table[258] = { + /* BASESYNTAX_DQSYNTAX_SQSYNTAX_ARISYNTAX */ + /* 0 PEOF */ CENDFILE_CENDFILE_CENDFILE_CENDFILE, +#if ENABLE_ASH_ALIAS + /* 1 PEOA */ CSPCL_CIGN_CIGN_CIGN, +#endif + /* 2 -128 0x80 */ CWORD_CWORD_CWORD_CWORD, + /* 3 -127 CTLESC */ CCTL_CCTL_CCTL_CCTL, + /* 4 -126 CTLVAR */ CCTL_CCTL_CCTL_CCTL, + /* 5 -125 CTLENDVAR */ CCTL_CCTL_CCTL_CCTL, + /* 6 -124 CTLBACKQ */ CCTL_CCTL_CCTL_CCTL, + /* 7 -123 CTLQUOTE */ CCTL_CCTL_CCTL_CCTL, + /* 8 -122 CTLARI */ CCTL_CCTL_CCTL_CCTL, + /* 9 -121 CTLENDARI */ CCTL_CCTL_CCTL_CCTL, + /* 10 -120 CTLQUOTEMARK */ CCTL_CCTL_CCTL_CCTL, + /* 11 -119 */ CWORD_CWORD_CWORD_CWORD, + /* 12 -118 */ CWORD_CWORD_CWORD_CWORD, + /* 13 -117 */ CWORD_CWORD_CWORD_CWORD, + /* 14 -116 */ CWORD_CWORD_CWORD_CWORD, + /* 15 -115 */ CWORD_CWORD_CWORD_CWORD, + /* 16 -114 */ CWORD_CWORD_CWORD_CWORD, + /* 17 -113 */ CWORD_CWORD_CWORD_CWORD, + /* 18 -112 */ CWORD_CWORD_CWORD_CWORD, + /* 19 -111 */ CWORD_CWORD_CWORD_CWORD, + /* 20 -110 */ CWORD_CWORD_CWORD_CWORD, + /* 21 -109 */ CWORD_CWORD_CWORD_CWORD, + /* 22 -108 */ CWORD_CWORD_CWORD_CWORD, + /* 23 -107 */ CWORD_CWORD_CWORD_CWORD, + /* 24 -106 */ CWORD_CWORD_CWORD_CWORD, + /* 25 -105 */ CWORD_CWORD_CWORD_CWORD, + /* 26 -104 */ CWORD_CWORD_CWORD_CWORD, + /* 27 -103 */ CWORD_CWORD_CWORD_CWORD, + /* 28 -102 */ CWORD_CWORD_CWORD_CWORD, + /* 29 -101 */ CWORD_CWORD_CWORD_CWORD, + /* 30 -100 */ CWORD_CWORD_CWORD_CWORD, + /* 31 -99 */ CWORD_CWORD_CWORD_CWORD, + /* 32 -98 */ CWORD_CWORD_CWORD_CWORD, + /* 33 -97 */ CWORD_CWORD_CWORD_CWORD, + /* 34 -96 */ CWORD_CWORD_CWORD_CWORD, + /* 35 -95 */ CWORD_CWORD_CWORD_CWORD, + /* 36 -94 */ CWORD_CWORD_CWORD_CWORD, + /* 37 -93 */ CWORD_CWORD_CWORD_CWORD, + /* 38 -92 */ CWORD_CWORD_CWORD_CWORD, + /* 39 -91 */ CWORD_CWORD_CWORD_CWORD, + /* 40 -90 */ CWORD_CWORD_CWORD_CWORD, + /* 41 -89 */ CWORD_CWORD_CWORD_CWORD, + /* 42 -88 */ CWORD_CWORD_CWORD_CWORD, + /* 43 -87 */ CWORD_CWORD_CWORD_CWORD, + /* 44 -86 */ CWORD_CWORD_CWORD_CWORD, + /* 45 -85 */ CWORD_CWORD_CWORD_CWORD, + /* 46 -84 */ CWORD_CWORD_CWORD_CWORD, + /* 47 -83 */ CWORD_CWORD_CWORD_CWORD, + /* 48 -82 */ CWORD_CWORD_CWORD_CWORD, + /* 49 -81 */ CWORD_CWORD_CWORD_CWORD, + /* 50 -80 */ CWORD_CWORD_CWORD_CWORD, + /* 51 -79 */ CWORD_CWORD_CWORD_CWORD, + /* 52 -78 */ CWORD_CWORD_CWORD_CWORD, + /* 53 -77 */ CWORD_CWORD_CWORD_CWORD, + /* 54 -76 */ CWORD_CWORD_CWORD_CWORD, + /* 55 -75 */ CWORD_CWORD_CWORD_CWORD, + /* 56 -74 */ CWORD_CWORD_CWORD_CWORD, + /* 57 -73 */ CWORD_CWORD_CWORD_CWORD, + /* 58 -72 */ CWORD_CWORD_CWORD_CWORD, + /* 59 -71 */ CWORD_CWORD_CWORD_CWORD, + /* 60 -70 */ CWORD_CWORD_CWORD_CWORD, + /* 61 -69 */ CWORD_CWORD_CWORD_CWORD, + /* 62 -68 */ CWORD_CWORD_CWORD_CWORD, + /* 63 -67 */ CWORD_CWORD_CWORD_CWORD, + /* 64 -66 */ CWORD_CWORD_CWORD_CWORD, + /* 65 -65 */ CWORD_CWORD_CWORD_CWORD, + /* 66 -64 */ CWORD_CWORD_CWORD_CWORD, + /* 67 -63 */ CWORD_CWORD_CWORD_CWORD, + /* 68 -62 */ CWORD_CWORD_CWORD_CWORD, + /* 69 -61 */ CWORD_CWORD_CWORD_CWORD, + /* 70 -60 */ CWORD_CWORD_CWORD_CWORD, + /* 71 -59 */ CWORD_CWORD_CWORD_CWORD, + /* 72 -58 */ CWORD_CWORD_CWORD_CWORD, + /* 73 -57 */ CWORD_CWORD_CWORD_CWORD, + /* 74 -56 */ CWORD_CWORD_CWORD_CWORD, + /* 75 -55 */ CWORD_CWORD_CWORD_CWORD, + /* 76 -54 */ CWORD_CWORD_CWORD_CWORD, + /* 77 -53 */ CWORD_CWORD_CWORD_CWORD, + /* 78 -52 */ CWORD_CWORD_CWORD_CWORD, + /* 79 -51 */ CWORD_CWORD_CWORD_CWORD, + /* 80 -50 */ CWORD_CWORD_CWORD_CWORD, + /* 81 -49 */ CWORD_CWORD_CWORD_CWORD, + /* 82 -48 */ CWORD_CWORD_CWORD_CWORD, + /* 83 -47 */ CWORD_CWORD_CWORD_CWORD, + /* 84 -46 */ CWORD_CWORD_CWORD_CWORD, + /* 85 -45 */ CWORD_CWORD_CWORD_CWORD, + /* 86 -44 */ CWORD_CWORD_CWORD_CWORD, + /* 87 -43 */ CWORD_CWORD_CWORD_CWORD, + /* 88 -42 */ CWORD_CWORD_CWORD_CWORD, + /* 89 -41 */ CWORD_CWORD_CWORD_CWORD, + /* 90 -40 */ CWORD_CWORD_CWORD_CWORD, + /* 91 -39 */ CWORD_CWORD_CWORD_CWORD, + /* 92 -38 */ CWORD_CWORD_CWORD_CWORD, + /* 93 -37 */ CWORD_CWORD_CWORD_CWORD, + /* 94 -36 */ CWORD_CWORD_CWORD_CWORD, + /* 95 -35 */ CWORD_CWORD_CWORD_CWORD, + /* 96 -34 */ CWORD_CWORD_CWORD_CWORD, + /* 97 -33 */ CWORD_CWORD_CWORD_CWORD, + /* 98 -32 */ CWORD_CWORD_CWORD_CWORD, + /* 99 -31 */ CWORD_CWORD_CWORD_CWORD, + /* 100 -30 */ CWORD_CWORD_CWORD_CWORD, + /* 101 -29 */ CWORD_CWORD_CWORD_CWORD, + /* 102 -28 */ CWORD_CWORD_CWORD_CWORD, + /* 103 -27 */ CWORD_CWORD_CWORD_CWORD, + /* 104 -26 */ CWORD_CWORD_CWORD_CWORD, + /* 105 -25 */ CWORD_CWORD_CWORD_CWORD, + /* 106 -24 */ CWORD_CWORD_CWORD_CWORD, + /* 107 -23 */ CWORD_CWORD_CWORD_CWORD, + /* 108 -22 */ CWORD_CWORD_CWORD_CWORD, + /* 109 -21 */ CWORD_CWORD_CWORD_CWORD, + /* 110 -20 */ CWORD_CWORD_CWORD_CWORD, + /* 111 -19 */ CWORD_CWORD_CWORD_CWORD, + /* 112 -18 */ CWORD_CWORD_CWORD_CWORD, + /* 113 -17 */ CWORD_CWORD_CWORD_CWORD, + /* 114 -16 */ CWORD_CWORD_CWORD_CWORD, + /* 115 -15 */ CWORD_CWORD_CWORD_CWORD, + /* 116 -14 */ CWORD_CWORD_CWORD_CWORD, + /* 117 -13 */ CWORD_CWORD_CWORD_CWORD, + /* 118 -12 */ CWORD_CWORD_CWORD_CWORD, + /* 119 -11 */ CWORD_CWORD_CWORD_CWORD, + /* 120 -10 */ CWORD_CWORD_CWORD_CWORD, + /* 121 -9 */ CWORD_CWORD_CWORD_CWORD, + /* 122 -8 */ CWORD_CWORD_CWORD_CWORD, + /* 123 -7 */ CWORD_CWORD_CWORD_CWORD, + /* 124 -6 */ CWORD_CWORD_CWORD_CWORD, + /* 125 -5 */ CWORD_CWORD_CWORD_CWORD, + /* 126 -4 */ CWORD_CWORD_CWORD_CWORD, + /* 127 -3 */ CWORD_CWORD_CWORD_CWORD, + /* 128 -2 */ CWORD_CWORD_CWORD_CWORD, + /* 129 -1 */ CWORD_CWORD_CWORD_CWORD, + /* 130 0 */ CWORD_CWORD_CWORD_CWORD, + /* 131 1 */ CWORD_CWORD_CWORD_CWORD, + /* 132 2 */ CWORD_CWORD_CWORD_CWORD, + /* 133 3 */ CWORD_CWORD_CWORD_CWORD, + /* 134 4 */ CWORD_CWORD_CWORD_CWORD, + /* 135 5 */ CWORD_CWORD_CWORD_CWORD, + /* 136 6 */ CWORD_CWORD_CWORD_CWORD, + /* 137 7 */ CWORD_CWORD_CWORD_CWORD, + /* 138 8 */ CWORD_CWORD_CWORD_CWORD, + /* 139 9 "\t" */ CSPCL_CWORD_CWORD_CWORD, + /* 140 10 "\n" */ CNL_CNL_CNL_CNL, + /* 141 11 */ CWORD_CWORD_CWORD_CWORD, + /* 142 12 */ CWORD_CWORD_CWORD_CWORD, + /* 143 13 */ CWORD_CWORD_CWORD_CWORD, + /* 144 14 */ CWORD_CWORD_CWORD_CWORD, + /* 145 15 */ CWORD_CWORD_CWORD_CWORD, + /* 146 16 */ CWORD_CWORD_CWORD_CWORD, + /* 147 17 */ CWORD_CWORD_CWORD_CWORD, + /* 148 18 */ CWORD_CWORD_CWORD_CWORD, + /* 149 19 */ CWORD_CWORD_CWORD_CWORD, + /* 150 20 */ CWORD_CWORD_CWORD_CWORD, + /* 151 21 */ CWORD_CWORD_CWORD_CWORD, + /* 152 22 */ CWORD_CWORD_CWORD_CWORD, + /* 153 23 */ CWORD_CWORD_CWORD_CWORD, + /* 154 24 */ CWORD_CWORD_CWORD_CWORD, + /* 155 25 */ CWORD_CWORD_CWORD_CWORD, + /* 156 26 */ CWORD_CWORD_CWORD_CWORD, + /* 157 27 */ CWORD_CWORD_CWORD_CWORD, + /* 158 28 */ CWORD_CWORD_CWORD_CWORD, + /* 159 29 */ CWORD_CWORD_CWORD_CWORD, + /* 160 30 */ CWORD_CWORD_CWORD_CWORD, + /* 161 31 */ CWORD_CWORD_CWORD_CWORD, + /* 162 32 " " */ CSPCL_CWORD_CWORD_CWORD, + /* 163 33 "!" */ CWORD_CCTL_CCTL_CWORD, + /* 164 34 """ */ CDQUOTE_CENDQUOTE_CWORD_CWORD, + /* 165 35 "#" */ CWORD_CWORD_CWORD_CWORD, + /* 166 36 "$" */ CVAR_CVAR_CWORD_CVAR, + /* 167 37 "%" */ CWORD_CWORD_CWORD_CWORD, + /* 168 38 "&" */ CSPCL_CWORD_CWORD_CWORD, + /* 169 39 "'" */ CSQUOTE_CWORD_CENDQUOTE_CWORD, + /* 170 40 "(" */ CSPCL_CWORD_CWORD_CLP, + /* 171 41 ")" */ CSPCL_CWORD_CWORD_CRP, + /* 172 42 "*" */ CWORD_CCTL_CCTL_CWORD, + /* 173 43 "+" */ CWORD_CWORD_CWORD_CWORD, + /* 174 44 "," */ CWORD_CWORD_CWORD_CWORD, + /* 175 45 "-" */ CWORD_CCTL_CCTL_CWORD, + /* 176 46 "." */ CWORD_CWORD_CWORD_CWORD, + /* 177 47 "/" */ CWORD_CCTL_CCTL_CWORD, + /* 178 48 "0" */ CWORD_CWORD_CWORD_CWORD, + /* 179 49 "1" */ CWORD_CWORD_CWORD_CWORD, + /* 180 50 "2" */ CWORD_CWORD_CWORD_CWORD, + /* 181 51 "3" */ CWORD_CWORD_CWORD_CWORD, + /* 182 52 "4" */ CWORD_CWORD_CWORD_CWORD, + /* 183 53 "5" */ CWORD_CWORD_CWORD_CWORD, + /* 184 54 "6" */ CWORD_CWORD_CWORD_CWORD, + /* 185 55 "7" */ CWORD_CWORD_CWORD_CWORD, + /* 186 56 "8" */ CWORD_CWORD_CWORD_CWORD, + /* 187 57 "9" */ CWORD_CWORD_CWORD_CWORD, + /* 188 58 ":" */ CWORD_CCTL_CCTL_CWORD, + /* 189 59 ";" */ CSPCL_CWORD_CWORD_CWORD, + /* 190 60 "<" */ CSPCL_CWORD_CWORD_CWORD, + /* 191 61 "=" */ CWORD_CCTL_CCTL_CWORD, + /* 192 62 ">" */ CSPCL_CWORD_CWORD_CWORD, + /* 193 63 "?" */ CWORD_CCTL_CCTL_CWORD, + /* 194 64 "@" */ CWORD_CWORD_CWORD_CWORD, + /* 195 65 "A" */ CWORD_CWORD_CWORD_CWORD, + /* 196 66 "B" */ CWORD_CWORD_CWORD_CWORD, + /* 197 67 "C" */ CWORD_CWORD_CWORD_CWORD, + /* 198 68 "D" */ CWORD_CWORD_CWORD_CWORD, + /* 199 69 "E" */ CWORD_CWORD_CWORD_CWORD, + /* 200 70 "F" */ CWORD_CWORD_CWORD_CWORD, + /* 201 71 "G" */ CWORD_CWORD_CWORD_CWORD, + /* 202 72 "H" */ CWORD_CWORD_CWORD_CWORD, + /* 203 73 "I" */ CWORD_CWORD_CWORD_CWORD, + /* 204 74 "J" */ CWORD_CWORD_CWORD_CWORD, + /* 205 75 "K" */ CWORD_CWORD_CWORD_CWORD, + /* 206 76 "L" */ CWORD_CWORD_CWORD_CWORD, + /* 207 77 "M" */ CWORD_CWORD_CWORD_CWORD, + /* 208 78 "N" */ CWORD_CWORD_CWORD_CWORD, + /* 209 79 "O" */ CWORD_CWORD_CWORD_CWORD, + /* 210 80 "P" */ CWORD_CWORD_CWORD_CWORD, + /* 211 81 "Q" */ CWORD_CWORD_CWORD_CWORD, + /* 212 82 "R" */ CWORD_CWORD_CWORD_CWORD, + /* 213 83 "S" */ CWORD_CWORD_CWORD_CWORD, + /* 214 84 "T" */ CWORD_CWORD_CWORD_CWORD, + /* 215 85 "U" */ CWORD_CWORD_CWORD_CWORD, + /* 216 86 "V" */ CWORD_CWORD_CWORD_CWORD, + /* 217 87 "W" */ CWORD_CWORD_CWORD_CWORD, + /* 218 88 "X" */ CWORD_CWORD_CWORD_CWORD, + /* 219 89 "Y" */ CWORD_CWORD_CWORD_CWORD, + /* 220 90 "Z" */ CWORD_CWORD_CWORD_CWORD, + /* 221 91 "[" */ CWORD_CCTL_CCTL_CWORD, + /* 222 92 "\" */ CBACK_CBACK_CCTL_CBACK, + /* 223 93 "]" */ CWORD_CCTL_CCTL_CWORD, + /* 224 94 "^" */ CWORD_CWORD_CWORD_CWORD, + /* 225 95 "_" */ CWORD_CWORD_CWORD_CWORD, + /* 226 96 "`" */ CBQUOTE_CBQUOTE_CWORD_CBQUOTE, + /* 227 97 "a" */ CWORD_CWORD_CWORD_CWORD, + /* 228 98 "b" */ CWORD_CWORD_CWORD_CWORD, + /* 229 99 "c" */ CWORD_CWORD_CWORD_CWORD, + /* 230 100 "d" */ CWORD_CWORD_CWORD_CWORD, + /* 231 101 "e" */ CWORD_CWORD_CWORD_CWORD, + /* 232 102 "f" */ CWORD_CWORD_CWORD_CWORD, + /* 233 103 "g" */ CWORD_CWORD_CWORD_CWORD, + /* 234 104 "h" */ CWORD_CWORD_CWORD_CWORD, + /* 235 105 "i" */ CWORD_CWORD_CWORD_CWORD, + /* 236 106 "j" */ CWORD_CWORD_CWORD_CWORD, + /* 237 107 "k" */ CWORD_CWORD_CWORD_CWORD, + /* 238 108 "l" */ CWORD_CWORD_CWORD_CWORD, + /* 239 109 "m" */ CWORD_CWORD_CWORD_CWORD, + /* 240 110 "n" */ CWORD_CWORD_CWORD_CWORD, + /* 241 111 "o" */ CWORD_CWORD_CWORD_CWORD, + /* 242 112 "p" */ CWORD_CWORD_CWORD_CWORD, + /* 243 113 "q" */ CWORD_CWORD_CWORD_CWORD, + /* 244 114 "r" */ CWORD_CWORD_CWORD_CWORD, + /* 245 115 "s" */ CWORD_CWORD_CWORD_CWORD, + /* 246 116 "t" */ CWORD_CWORD_CWORD_CWORD, + /* 247 117 "u" */ CWORD_CWORD_CWORD_CWORD, + /* 248 118 "v" */ CWORD_CWORD_CWORD_CWORD, + /* 249 119 "w" */ CWORD_CWORD_CWORD_CWORD, + /* 250 120 "x" */ CWORD_CWORD_CWORD_CWORD, + /* 251 121 "y" */ CWORD_CWORD_CWORD_CWORD, + /* 252 122 "z" */ CWORD_CWORD_CWORD_CWORD, + /* 253 123 "{" */ CWORD_CWORD_CWORD_CWORD, + /* 254 124 "|" */ CSPCL_CWORD_CWORD_CWORD, + /* 255 125 "}" */ CENDVAR_CENDVAR_CWORD_CENDVAR, + /* 256 126 "~" */ CWORD_CCTL_CCTL_CWORD, + /* 257 127 */ CWORD_CWORD_CWORD_CWORD, +}; - if (quoted && (flags & EXP_FULL)) - sep = 1 << CHAR_BIT; +#define SIT(c, syntax) (S_I_T[(int)syntax_index_table[((int)c)+SYNBASE]][syntax]) - syntax = quoted ? DQSYNTAX : BASESYNTAX; - switch (*name) { - case '$': - num = rootpid; - goto numvar; - case '?': - num = exitstatus; - goto numvar; - case '#': - num = shellparam.nparam; - goto numvar; - case '!': - num = backgndpid; - if (num == 0) - return -1; -numvar: - len = cvtnum(num); - break; - case '-': - p = makestrspace(NOPTS, expdest); - for (i = NOPTS - 1; i >= 0; i--) { - if (optlist[i]) { - USTPUTC(optletters(i), p); - len++; - } - } - expdest = p; - break; - case '@': - if (sep) - goto param; - /* fall through */ - case '*': - sep = ifsset() ? SC2INT(ifsval()[0]) : ' '; - if (quotes && (SIT(sep, syntax) == CCTL || SIT(sep, syntax) == CBACK)) - sepq = 1; -param: - if (!(ap = shellparam.p)) - return -1; - while ((p = *ap++)) { - size_t partlen; +#endif /* USE_SIT_FUNCTION */ - partlen = strlen(p); - len += partlen; - if (!(subtype == VSPLUS || subtype == VSLENGTH)) - memtodest(p, partlen, syntax, quotes); +/* ============ Alias handling */ - if (*ap && sep) { - char *q; +#if ENABLE_ASH_ALIAS - len++; - if (subtype == VSPLUS || subtype == VSLENGTH) { - continue; - } - q = expdest; - if (sepq) - STPUTC(CTLESC, q); - STPUTC(sep, q); - expdest = q; - } - } - return len; - case '0': - case '1': - case '2': - case '3': - case '4': - case '5': - case '6': - case '7': - case '8': - case '9': - num = atoi(name); - if (num < 0 || num > shellparam.nparam) - return -1; - p = num ? shellparam.p[num - 1] : arg0; - goto value; - default: - p = lookupvar(name); -value: - if (!p) - return -1; +#define ALIASINUSE 1 +#define ALIASDEAD 2 - len = strlen(p); - if (!(subtype == VSPLUS || subtype == VSLENGTH)) - memtodest(p, len, syntax, quotes); - return len; - } +#define ATABSIZE 39 - if (subtype == VSPLUS || subtype == VSLENGTH) - STADJUST(-len, expdest); - return len; -} +struct alias { + struct alias *next; + char *name; + char *val; + int flag; +}; +static struct alias *atab[ATABSIZE]; -/* - * Record the fact that we have to scan this region of the - * string for IFS characters. - */ +static struct alias ** +__lookupalias(const char *name) { + unsigned int hashval; + struct alias **app; + const char *p; + unsigned int ch; -static void -recordregion(int start, int end, int nulonly) -{ - struct ifsregion *ifsp; + p = name; - if (ifslastp == NULL) { - ifsp = &ifsfirst; - } else { - INTOFF; - ifsp = (struct ifsregion *)ckmalloc(sizeof (struct ifsregion)); - ifsp->next = NULL; - ifslastp->next = ifsp; - INTON; + ch = (unsigned char)*p; + hashval = ch << 4; + while (ch) { + hashval += ch; + ch = (unsigned char)*++p; } - ifslastp = ifsp; - ifslastp->begoff = start; - ifslastp->endoff = end; - ifslastp->nulonly = nulonly; -} - - -/* - * Break the argument string into pieces based upon IFS and add the - * strings to the argument list. The regions of the string to be - * searched for IFS characters have been stored by recordregion. - */ -static void -ifsbreakup(char *string, struct arglist *arglist) -{ - struct ifsregion *ifsp; - struct strlist *sp; - char *start; - char *p; - char *q; - const char *ifs, *realifs; - int ifsspc; - int nulonly; - + app = &atab[hashval % ATABSIZE]; - start = string; - if (ifslastp != NULL) { - ifsspc = 0; - nulonly = 0; - realifs = ifsset() ? ifsval() : defifs; - ifsp = &ifsfirst; - do { - p = string + ifsp->begoff; - nulonly = ifsp->nulonly; - ifs = nulonly ? nullstr : realifs; - ifsspc = 0; - while (p < string + ifsp->endoff) { - q = p; - if (*p == CTLESC) - p++; - if (strchr(ifs, *p)) { - if (!nulonly) - ifsspc = (strchr(defifs, *p) != NULL); - /* Ignore IFS whitespace at start */ - if (q == start && ifsspc) { - p++; - start = p; - continue; - } - *q = '\0'; - sp = (struct strlist *)stalloc(sizeof *sp); - sp->text = start; - *arglist->lastp = sp; - arglist->lastp = &sp->next; - p++; - if (!nulonly) { - for (;;) { - if (p >= string + ifsp->endoff) { - break; - } - q = p; - if (*p == CTLESC) - p++; - if (strchr(ifs, *p) == NULL ) { - p = q; - break; - } else if (strchr(defifs, *p) == NULL) { - if (ifsspc) { - p++; - ifsspc = 0; - } else { - p = q; - break; - } - } else - p++; - } - } - start = p; - } else - p++; - } - } while ((ifsp = ifsp->next) != NULL); - if (nulonly) - goto add; + for (; *app; app = &(*app)->next) { + if (strcmp(name, (*app)->name) == 0) { + break; + } } - - if (!*start) - return; - -add: - sp = (struct strlist *)stalloc(sizeof *sp); - sp->text = start; - *arglist->lastp = sp; - arglist->lastp = &sp->next; + + return app; } -static void -ifsfree(void) +static struct alias * +lookupalias(const char *name, int check) { - struct ifsregion *p; + struct alias *ap = *__lookupalias(name); - INTOFF; - p = ifsfirst.next; - do { - struct ifsregion *ifsp; - ifsp = p->next; - ckfree(p); - p = ifsp; - } while (p); - ifslastp = NULL; - ifsfirst.next = NULL; - INTON; + if (check && ap && (ap->flag & ALIASINUSE)) + return NULL; + return ap; } -static void expmeta(char *, char *); -static struct strlist *expsort(struct strlist *); -static struct strlist *msort(struct strlist *, int); +static struct alias * +freealias(struct alias *ap) +{ + struct alias *next; -static char *expdir; + if (ap->flag & ALIASINUSE) { + ap->flag |= ALIASDEAD; + return ap; + } + next = ap->next; + free(ap->name); + free(ap->val); + free(ap); + return next; +} static void -expandmeta(struct strlist *str, int flag) +setalias(const char *name, const char *val) { - static const char metachars[] = { - '*', '?', '[', 0 - }; - /* TODO - EXP_REDIR */ + struct alias *ap, **app; - while (str) { - struct strlist **savelastp; - struct strlist *sp; - char *p; + app = __lookupalias(name); + ap = *app; + INT_OFF; + if (ap) { + if (!(ap->flag & ALIASINUSE)) { + free(ap->val); + } + ap->val = ckstrdup(val); + ap->flag &= ~ALIASDEAD; + } else { + /* not found */ + ap = ckmalloc(sizeof(struct alias)); + ap->name = ckstrdup(name); + ap->val = ckstrdup(val); + ap->flag = 0; + ap->next = 0; + *app = ap; + } + INT_ON; +} - if (fflag) - goto nometa; - if (!strpbrk(str->text, metachars)) - goto nometa; - savelastp = exparg.lastp; +static int +unalias(const char *name) +{ + struct alias **app; - INTOFF; - p = preglob(str->text, 0, RMESCAPE_ALLOC | RMESCAPE_HEAP); - { - int i = strlen(str->text); - expdir = ckmalloc(i < 2048 ? 2048 : i); /* XXX */ - } + app = __lookupalias(name); - expmeta(expdir, p); - ckfree(expdir); - if (p != str->text) - ckfree(p); - INTON; - if (exparg.lastp == savelastp) { - /* - * no matches - */ -nometa: - *exparg.lastp = str; - rmescapes(str->text); - exparg.lastp = &str->next; - } else { - *exparg.lastp = NULL; - *savelastp = sp = expsort(*savelastp); - while (sp->next != NULL) - sp = sp->next; - exparg.lastp = &sp->next; - } - str = str->next; + if (*app) { + INT_OFF; + *app = freealias(*app); + INT_ON; + return 0; } -} -/* - * Add a file name to the list. - */ + return 1; +} static void -addfname(const char *name) +rmaliases(void) { - struct strlist *sp; + struct alias *ap, **app; + int i; - sp = (struct strlist *)stalloc(sizeof *sp); - sp->text = sstrdup(name); - *exparg.lastp = sp; - exparg.lastp = &sp->next; + INT_OFF; + for (i = 0; i < ATABSIZE; i++) { + app = &atab[i]; + for (ap = *app; ap; ap = *app) { + *app = freealias(*app); + if (ap == *app) { + app = &ap->next; + } + } + } + INT_ON; } +static void +printalias(const struct alias *ap) +{ + out1fmt("%s=%s\n", ap->name, single_quote(ap->val)); +} /* - * Do metacharacter (i.e. *, ?, [...]) expansion. + * TODO - sort output */ - -static void -expmeta(char *enddir, char *name) +static int +aliascmd(int argc, char **argv) { - char *p; - const char *cp; - char *start; - char *endname; - int metaflag; - struct stat statb; - DIR *dirp; - struct dirent *dp; - int atend; - int matchdot; + char *n, *v; + int ret = 0; + struct alias *ap; - metaflag = 0; - start = name; - for (p = name; *p; p++) { - if (*p == '*' || *p == '?') - metaflag = 1; - else if (*p == '[') { - char *q = p + 1; - if (*q == '!') - q++; - for (;;) { - if (*q == '\\') - q++; - if (*q == '/' || *q == '\0') - break; - if (*++q == ']') { - metaflag = 1; - break; - } + if (argc == 1) { + int i; + + for (i = 0; i < ATABSIZE; i++) + for (ap = atab[i]; ap; ap = ap->next) { + printalias(ap); } - } else if (*p == '\\') - p++; - else if (*p == '/') { - if (metaflag) - goto out; - start = p + 1; - } - } -out: - if (metaflag == 0) { /* we've reached the end of the file name */ - if (enddir != expdir) - metaflag++; - p = name; - do { - if (*p == '\\') - p++; - *enddir++ = *p; - } while (*p++); - if (metaflag == 0 || lstat(expdir, &statb) >= 0) - addfname(expdir); - return; - } - endname = p; - if (name < start) { - p = name; - do { - if (*p == '\\') - p++; - *enddir++ = *p++; - } while (p < start); + return 0; } - if (enddir == expdir) { - cp = "."; - } else if (enddir == expdir + 1 && *expdir == '/') { - cp = "/"; - } else { - cp = expdir; - enddir[-1] = '\0'; + while ((n = *++argv) != NULL) { + v = strchr(n+1, '='); + if (v == NULL) { /* n+1: funny ksh stuff */ + ap = *__lookupalias(n); + if (ap == NULL) { + fprintf(stderr, "%s: %s not found\n", "alias", n); + ret = 1; + } else + printalias(ap); + } else { + *v++ = '\0'; + setalias(n, v); + } } - if ((dirp = opendir(cp)) == NULL) - return; - if (enddir != expdir) - enddir[-1] = '/'; - if (*endname == 0) { - atend = 1; - } else { - atend = 0; - *endname++ = '\0'; + + return ret; +} + +static int +unaliascmd(int argc, char **argv) +{ + int i; + + while ((i = nextopt("a")) != '\0') { + if (i == 'a') { + rmaliases(); + return 0; + } } - matchdot = 0; - p = start; - if (*p == '\\') - p++; - if (*p == '.') - matchdot++; - while (! intpending && (dp = readdir(dirp)) != NULL) { - if (dp->d_name[0] == '.' && ! matchdot) - continue; - if (pmatch(start, dp->d_name)) { - if (atend) { - scopy(dp->d_name, enddir); - addfname(expdir); - } else { - for (p = enddir, cp = dp->d_name; - (*p++ = *cp++) != '\0';) - continue; - p[-1] = '/'; - expmeta(p, endname); - } + for (i = 0; *argptr; argptr++) { + if (unalias(*argptr)) { + fprintf(stderr, "%s: %s not found\n", "unalias", *argptr); + i = 1; } } - closedir(dirp); - if (! atend) - endname[-1] = '/'; + + return i; } +#endif /* ASH_ALIAS */ + + +/* ============ jobs.c */ + +/* Mode argument to forkshell. Don't change FORK_FG or FORK_BG. */ +#define FORK_FG 0 +#define FORK_BG 1 +#define FORK_NOJOB 2 + +/* mode flags for showjob(s) */ +#define SHOW_PGID 0x01 /* only show pgid - for jobs -p */ +#define SHOW_PID 0x04 /* include process pid */ +#define SHOW_CHANGED 0x08 /* only jobs whose state has changed */ + /* - * Sort the results of file name expansion. It calculates the number of - * strings to sort and then calls msort (short for merge sort) to do the - * work. + * A job structure contains information about a job. A job is either a + * single process or a set of processes contained in a pipeline. In the + * latter case, pidlist will be non-NULL, and will point to a -1 terminated + * array of pids. */ -static struct strlist * -expsort(struct strlist *str) -{ - int len; - struct strlist *sp; +struct procstat { + pid_t pid; /* process id */ + int status; /* last process status from wait() */ + char *cmd; /* text of command being run */ +}; - len = 0; - for (sp = str ; sp ; sp = sp->next) - len++; - return msort(str, len); -} +struct job { + struct procstat ps0; /* status of process */ + struct procstat *ps; /* status or processes when more than one */ +#if JOBS + int stopstatus; /* status of a stopped job */ +#endif + uint32_t + nprocs: 16, /* number of processes */ + state: 8, +#define JOBRUNNING 0 /* at least one proc running */ +#define JOBSTOPPED 1 /* all procs are stopped */ +#define JOBDONE 2 /* all procs are completed */ +#if JOBS + sigint: 1, /* job was killed by SIGINT */ + jobctl: 1, /* job running under job control */ +#endif + waited: 1, /* true if this entry has been waited for */ + used: 1, /* true if this entry is in used */ + changed: 1; /* true if status has changed */ + struct job *prev_job; /* previous job */ +}; +static pid_t backgndpid; /* pid of last background process */ +static smallint job_warning; /* user was warned about stopped jobs (can be 2, 1 or 0). */ -static struct strlist * -msort(struct strlist *list, int len) -{ - struct strlist *p, *q = NULL; - struct strlist **lpp; - int half; - int n; +static struct job *makejob(union node *, int); +static int forkshell(struct job *, union node *, int); +static int waitforjob(struct job *); - if (len <= 1) - return list; - half = len >> 1; - p = list; - for (n = half ; --n >= 0 ; ) { - q = p; - p = p->next; - } - q->next = NULL; /* terminate first half of list */ - q = msort(list, half); /* sort first half of list */ - p = msort(p, len - half); /* sort second half */ - lpp = &list; - for (;;) { -#ifdef CONFIG_LOCALE_SUPPORT - if (strcoll(p->text, q->text) < 0) +#if !JOBS +enum { jobctl = 0 }; +#define setjobctl(on) do {} while (0) #else - if (strcmp(p->text, q->text) < 0) +static smallint jobctl; /* true if doing job control */ +static void setjobctl(int); #endif - { - *lpp = p; - lpp = &p->next; - if ((p = *lpp) == NULL) { - *lpp = q; + +/* + * Set the signal handler for the specified signal. The routine figures + * out what it should be set to. + */ +static void +setsignal(int signo) +{ + int action; + char *t, tsig; + struct sigaction act; + + t = trap[signo]; + if (t == NULL) + action = S_DFL; + else if (*t != '\0') + action = S_CATCH; + else + action = S_IGN; + if (rootshell && action == S_DFL) { + switch (signo) { + case SIGINT: + if (iflag || minusc || sflag == 0) + action = S_CATCH; + break; + case SIGQUIT: +#if DEBUG + if (debug) break; - } +#endif + /* FALLTHROUGH */ + case SIGTERM: + if (iflag) + action = S_IGN; + break; +#if JOBS + case SIGTSTP: + case SIGTTOU: + if (mflag) + action = S_IGN; + break; +#endif + } + } + + t = &sigmode[signo - 1]; + tsig = *t; + if (tsig == 0) { + /* + * current setting unknown + */ + if (sigaction(signo, 0, &act) == -1) { + /* + * Pretend it worked; maybe we should give a warning + * here, but other shells don't. We don't alter + * sigmode, so that we retry every time. + */ + return; + } + if (act.sa_handler == SIG_IGN) { + if (mflag + && (signo == SIGTSTP || signo == SIGTTIN || signo == SIGTTOU) + ) { + tsig = S_IGN; /* don't hard ignore these */ + } else + tsig = S_HARD_IGN; } else { - *lpp = q; - lpp = &q->next; - if ((q = *lpp) == NULL) { - *lpp = p; - break; - } + tsig = S_RESET; /* force to be set */ } } - return list; + if (tsig == S_HARD_IGN || tsig == action) + return; + switch (action) { + case S_CATCH: + act.sa_handler = onsig; + break; + case S_IGN: + act.sa_handler = SIG_IGN; + break; + default: + act.sa_handler = SIG_DFL; + } + *t = action; + act.sa_flags = 0; + sigfillset(&act.sa_mask); + sigaction(signo, &act, 0); } +/* mode flags for set_curjob */ +#define CUR_DELETE 2 +#define CUR_RUNNING 1 +#define CUR_STOPPED 0 -/* - * Returns true if the pattern matches the string. - */ +/* mode flags for dowait */ +#define DOWAIT_NORMAL 0 +#define DOWAIT_BLOCK 1 -static int patmatch(char *pattern, const char *string) +#if JOBS +/* pgrp of shell on invocation */ +static int initialpgrp; +static int ttyfd = -1; +#endif +/* array of jobs */ +static struct job *jobtab; +/* size of array */ +static unsigned njobs; +/* current job */ +static struct job *curjob; +/* number of presumed living untracked jobs */ +static int jobless; + +static void +set_curjob(struct job *jp, unsigned mode) { - return pmatch(preglob(pattern, 0, 0), string); + struct job *jp1; + struct job **jpp, **curp; + + /* first remove from list */ + jpp = curp = &curjob; + do { + jp1 = *jpp; + if (jp1 == jp) + break; + jpp = &jp1->prev_job; + } while (1); + *jpp = jp1->prev_job; + + /* Then re-insert in correct position */ + jpp = curp; + switch (mode) { + default: +#if DEBUG + abort(); +#endif + case CUR_DELETE: + /* job being deleted */ + break; + case CUR_RUNNING: + /* newly created job or backgrounded job, + put after all stopped jobs. */ + do { + jp1 = *jpp; +#if JOBS + if (!jp1 || jp1->state != JOBSTOPPED) +#endif + break; + jpp = &jp1->prev_job; + } while (1); + /* FALLTHROUGH */ +#if JOBS + case CUR_STOPPED: +#endif + /* newly stopped job - becomes curjob */ + jp->prev_job = *jpp; + *jpp = jp; + break; + } } +#if JOBS || DEBUG +static int +jobno(const struct job *jp) +{ + return jp - jobtab + 1; +} +#endif /* - * Remove any CTLESC characters from a string. + * Convert a job name to a job structure. */ +static struct job * +getjob(const char *name, int getctl) +{ + struct job *jp; + struct job *found; + const char *err_msg = "No such job: %s"; + unsigned num; + int c; + const char *p; + char *(*match)(const char *, const char *); + + jp = curjob; + p = name; + if (!p) + goto currentjob; -static char * -_rmescapes(char *str, int flag) -{ - char *p, *q, *r; - static const char qchars[] = { CTLESC, CTLQUOTEMARK, 0 }; - unsigned inquotes; - int notescaped; - int globbing; + if (*p != '%') + goto err; - p = strpbrk(str, qchars); - if (!p) { - return str; - } - q = p; - r = str; - if (flag & RMESCAPE_ALLOC) { - size_t len = p - str; - size_t fulllen = len + strlen(p) + 1; + c = *++p; + if (!c) + goto currentjob; - if (flag & RMESCAPE_GROW) { - r = makestrspace(fulllen, expdest); - } else if (flag & RMESCAPE_HEAP) { - r = ckmalloc(fulllen); - } else { - r = stalloc(fulllen); + if (!p[1]) { + if (c == '+' || c == '%') { + currentjob: + err_msg = "No current job"; + goto check; } - q = r; - if (len > 0) { - q = memcpy(q, str, len) + len; + if (c == '-') { + if (jp) + jp = jp->prev_job; + err_msg = "No previous job"; + check: + if (!jp) + goto err; + goto gotit; } } - inquotes = (flag & RMESCAPE_QUOTED) ^ RMESCAPE_QUOTED; - globbing = flag & RMESCAPE_GLOB; - notescaped = globbing; - while (*p) { - if (*p == CTLQUOTEMARK) { - inquotes = ~inquotes; - p++; - notescaped = globbing; - continue; - } - if (*p == '\\') { - /* naked back slash */ - notescaped = 0; - goto copy; - } - if (*p == CTLESC) { - p++; - if (notescaped && inquotes && *p != '/') { - *q++ = '\\'; - } + + if (is_number(p)) { + num = atoi(p); + if (num < njobs) { + jp = jobtab + num - 1; + if (jp->used) + goto gotit; + goto err; } - notescaped = globbing; -copy: - *q++ = *p++; - } - *q = '\0'; - if (flag & RMESCAPE_GROW) { - expdest = r; - STADJUST(q - r + 1, expdest); } - return r; -} + match = prefix; + if (*p == '?') { + match = strstr; + p++; + } -/* - * See if a pattern matches in a case statement. - */ - -int -casematch(union node *pattern, char *val) -{ - struct stackmark smark; - int result; + found = 0; + while (1) { + if (!jp) + goto err; + if (match(jp->ps[0].cmd, p)) { + if (found) + goto err; + found = jp; + err_msg = "%s: ambiguous"; + } + jp = jp->prev_job; + } - setstackmark(&smark); - argbackq = pattern->narg.backquote; - STARTSTACKSTR(expdest); - ifslastp = NULL; - argstr(pattern->narg.text, EXP_TILDE | EXP_CASE); - STACKSTRNUL(expdest); - result = patmatch(stackblock(), val); - popstackmark(&smark); - return result; + gotit: +#if JOBS + err_msg = "job %s not created under job control"; + if (getctl && jp->jobctl == 0) + goto err; +#endif + return jp; + err: + ash_msg_and_raise_error(err_msg, name); } /* - * Our own itoa(). + * Mark a job structure as unused. */ - -static int -cvtnum(arith_t num) +static void +freejob(struct job *jp) { - int len; + struct procstat *ps; + int i; - expdest = makestrspace(32, expdest); -#ifdef CONFIG_ASH_MATH_SUPPORT_64 - len = fmtstr(expdest, 32, "%lld", (long long) num); -#else - len = fmtstr(expdest, 32, "%ld", num); -#endif - STADJUST(len, expdest); - return len; + INT_OFF; + for (i = jp->nprocs, ps = jp->ps; --i >= 0; ps++) { + if (ps->cmd != nullstr) + free(ps->cmd); + } + if (jp->ps != &jp->ps0) + free(jp->ps); + jp->used = 0; + set_curjob(jp, CUR_DELETE); + INT_ON; } +#if JOBS static void -varunset(const char *end, const char *var, const char *umsg, int varflags) +xtcsetpgrp(int fd, pid_t pgrp) { - const char *msg; - const char *tail; - - tail = nullstr; - msg = "parameter not set"; - if (umsg) { - if (*end == CTLENDVAR) { - if (varflags & VSNUL) - tail = " or null"; - } else - msg = umsg; - } - sh_error("%.*s: %s%s", end - var - 1, var, msg, tail); + if (tcsetpgrp(fd, pgrp)) + ash_msg_and_raise_error("cannot set tty process group (%m)"); } - -/* input.c */ - -/* - * This implements the input routines used by the parser. - */ - -#define EOF_NLEFT -99 /* value of parsenleft when EOF pushed back */ - -static void pushfile(void); - /* - * Read a character from the script, returning PEOF on end of file. - * Nul characters in the input are silently discarded. + * Turn job control on and off. + * + * Note: This code assumes that the third arg to ioctl is a character + * pointer, which is true on Berkeley systems but not System V. Since + * System V doesn't have job control yet, this isn't a problem now. + * + * Called with interrupts off. */ +static void +setjobctl(int on) +{ + int fd; + int pgrp; + if (on == jobctl || rootshell == 0) + return; + if (on) { + int ofd; + ofd = fd = open(_PATH_TTY, O_RDWR); + if (fd < 0) { + /* BTW, bash will try to open(ttyname(0)) if open("/dev/tty") fails. + * That sometimes helps to acquire controlling tty. + * Obviously, a workaround for bugs when someone + * failed to provide a controlling tty to bash! :) */ + fd += 3; + while (!isatty(fd) && --fd >= 0) + ; + } + fd = fcntl(fd, F_DUPFD, 10); + close(ofd); + if (fd < 0) + goto out; + close_on_exec_on(fd); + do { /* while we are in the background */ + pgrp = tcgetpgrp(fd); + if (pgrp < 0) { + out: + ash_msg("can't access tty; job control turned off"); + mflag = on = 0; + goto close; + } + if (pgrp == getpgrp()) + break; + killpg(0, SIGTTIN); + } while (1); + initialpgrp = pgrp; -#define pgetc_as_macro() (--parsenleft >= 0? SC2INT(*parsenextc++) : preadbuffer()) - -#ifdef CONFIG_ASH_OPTIMIZE_FOR_SIZE -#define pgetc_macro() pgetc() -static int -pgetc(void) -{ - return pgetc_as_macro(); + setsignal(SIGTSTP); + setsignal(SIGTTOU); + setsignal(SIGTTIN); + pgrp = rootpid; + setpgid(0, pgrp); + xtcsetpgrp(fd, pgrp); + } else { + /* turning job control off */ + fd = ttyfd; + pgrp = initialpgrp; + /* was xtcsetpgrp, but this can make exiting ash + * with pty already deleted loop forever */ + tcsetpgrp(fd, pgrp); + setpgid(0, pgrp); + setsignal(SIGTSTP); + setsignal(SIGTTOU); + setsignal(SIGTTIN); + close: + close(fd); + fd = -1; + } + ttyfd = fd; + jobctl = on; } -#else -#define pgetc_macro() pgetc_as_macro() + static int -pgetc(void) +killcmd(int argc, char **argv) { - return pgetc_macro(); + if (argv[1] && strcmp(argv[1], "-l") != 0) { + int i = 1; + do { + if (argv[i][0] == '%') { + struct job *jp = getjob(argv[i], 0); + unsigned pid = jp->ps[0].pid; + /* Enough space for ' -NNN' */ + argv[i] = alloca(sizeof(int)*3 + 3); + /* kill_main has matching code to expect + * leading space. Needed to not confuse + * negative pids with "kill -SIGNAL_NO" syntax */ + sprintf(argv[i], " -%u", pid); + } + } while (argv[++i]); + } + return kill_main(argc, argv); } -#endif - -/* - * Same as pgetc(), but ignores PEOA. - */ -#ifdef CONFIG_ASH_ALIAS -static int pgetc2(void) +static void +showpipe(struct job *jp, FILE *out) { - int c; + struct procstat *sp; + struct procstat *spend; - do { - c = pgetc_macro(); - } while (c == PEOA); - return c; -} -#else -static int pgetc2(void) -{ - return pgetc_macro(); + spend = jp->ps + jp->nprocs; + for (sp = jp->ps + 1; sp < spend; sp++) + fprintf(out, " | %s", sp->cmd); + outcslow('\n', out); + flush_stdout_stderr(); } -#endif -/* - * Read a line from the script. - */ -static char * pfgets(char *line, int len) +static int +restartjob(struct job *jp, int mode) { - char *p = line; - int nleft = len; - int c; + struct procstat *ps; + int i; + int status; + pid_t pgid; - while (--nleft > 0) { - c = pgetc2(); - if (c == PEOF) { - if (p == line) - return NULL; - break; + INT_OFF; + if (jp->state == JOBDONE) + goto out; + jp->state = JOBRUNNING; + pgid = jp->ps->pid; + if (mode == FORK_FG) + xtcsetpgrp(ttyfd, pgid); + killpg(pgid, SIGCONT); + ps = jp->ps; + i = jp->nprocs; + do { + if (WIFSTOPPED(ps->status)) { + ps->status = -1; } - *p++ = c; - if (c == '\n') - break; - } - *p = '\0'; - return line; + ps++; + } while (--i); + out: + status = (mode == FORK_FG) ? waitforjob(jp) : 0; + INT_ON; + return status; } - - -#ifdef CONFIG_FEATURE_COMMAND_EDITING -#ifdef CONFIG_ASH_EXPAND_PRMT -static char *cmdedit_prompt; -#else -static const char *cmdedit_prompt; -#endif -static void putprompt(const char *s) -{ -#ifdef CONFIG_ASH_EXPAND_PRMT - free(cmdedit_prompt); - cmdedit_prompt = xstrdup(s); -#else - cmdedit_prompt = s; -#endif -} -#else -static void putprompt(const char *s) +static int +fg_bgcmd(int argc, char **argv) { - out2str(s); + struct job *jp; + FILE *out; + int mode; + int retval; + + mode = (**argv == 'f') ? FORK_FG : FORK_BG; + nextopt(nullstr); + argv = argptr; + out = stdout; + do { + jp = getjob(*argv, 1); + if (mode == FORK_BG) { + set_curjob(jp, CUR_RUNNING); + fprintf(out, "[%d] ", jobno(jp)); + } + outstr(jp->ps->cmd, out); + showpipe(jp, out); + retval = restartjob(jp, mode); + } while (*argv && *++argv); + return retval; } #endif -static int preadfd(void) +static int +sprint_status(char *s, int status, int sigonly) { - int nr; - char *buf = parsefile->buf; - parsenextc = buf; + int col; + int st; -retry: -#ifdef CONFIG_FEATURE_COMMAND_EDITING - if (!iflag || parsefile->fd) - nr = safe_read(parsefile->fd, buf, BUFSIZ - 1); - else { -#ifdef CONFIG_FEATURE_COMMAND_TAB_COMPLETION - cmdedit_path_lookup = pathval(); + col = 0; + if (!WIFEXITED(status)) { +#if JOBS + if (WIFSTOPPED(status)) + st = WSTOPSIG(status); + else #endif - nr = cmdedit_read_input((char *) cmdedit_prompt, buf); - if(nr == 0) { - /* Ctrl+C presend */ - if(trap[SIGINT]) { - buf[0] = '\n'; - buf[1] = 0; - raise(SIGINT); - return 1; - } - goto retry; - } - if(nr < 0 && errno == 0) { - /* Ctrl+D presend */ - nr = 0; - } - } -#else - nr = safe_read(parsefile->fd, buf, BUFSIZ - 1); + st = WTERMSIG(status); + if (sigonly) { + if (st == SIGINT || st == SIGPIPE) + goto out; +#if JOBS + if (WIFSTOPPED(status)) + goto out; #endif - - if (nr < 0) { - if (parsefile->fd == 0 && errno == EWOULDBLOCK) { - int flags = fcntl(0, F_GETFL, 0); - if (flags >= 0 && flags & O_NONBLOCK) { - flags &=~ O_NONBLOCK; - if (fcntl(0, F_SETFL, flags) >= 0) { - out2str("sh: turning off NDELAY mode\n"); - goto retry; - } - } } + st &= 0x7f; + col = fmtstr(s, 32, strsignal(st)); + if (WCOREDUMP(status)) { + col += fmtstr(s + col, 16, " (core dumped)"); + } + } else if (!sigonly) { + st = WEXITSTATUS(status); + if (st) + col = fmtstr(s, 16, "Done(%d)", st); + else + col = fmtstr(s, 16, "Done"); } - return nr; + out: + return col; } /* - * Refill the input buffer and return the next input character: + * Do a wait system call. If job control is compiled in, we accept + * stopped processes. If block is zero, we return a value of zero + * rather than blocking. * - * 1) If a string was pushed back on the input, pop it; - * 2) If an EOF was pushed back (parsenleft == EOF_NLEFT) or we are reading - * from a string so we can't refill the buffer, return EOF. - * 3) If the is more stuff in this buffer, use it else call read to fill it. - * 4) Process input up to the next newline, deleting nul characters. + * System V doesn't have a non-blocking wait system call. It does + * have a SIGCLD signal that is sent to a process when one of it's + * children dies. The obvious way to use SIGCLD would be to install + * a handler for SIGCLD which simply bumped a counter when a SIGCLD + * was received, and have waitproc bump another counter when it got + * the status of a process. Waitproc would then know that a wait + * system call would not block if the two counters were different. + * This approach doesn't work because if a process has children that + * have not been waited for, System V will send it a SIGCLD when it + * installs a signal handler for SIGCLD. What this means is that when + * a child exits, the shell will be sent SIGCLD signals continuously + * until is runs out of stack space, unless it does a wait call before + * restoring the signal handler. The code below takes advantage of + * this (mis)feature by installing a signal handler for SIGCLD and + * then checking to see whether it was called. If there are any + * children to be waited for, it will be. + * + * If neither SYSV nor BSD is defined, we don't implement nonblocking + * waits at all. In this case, the user will not be informed when + * a background process until the next time she runs a real program + * (as opposed to running a builtin command or just typing return), + * and the jobs command may give out of date information. */ +static int +waitproc(int block, int *status) +{ + int flags = 0; -int -preadbuffer(void) +#if JOBS + if (jobctl) + flags |= WUNTRACED; +#endif + if (block == 0) + flags |= WNOHANG; + return wait3(status, flags, (struct rusage *)NULL); +} + +/* + * Wait for a process to terminate. + */ +static int +dowait(int block, struct job *job) { - char *q; - int more; - char savec; + int pid; + int status; + struct job *jp; + struct job *thisjob; + int state; - while (parsefile->strpush) { -#ifdef CONFIG_ASH_ALIAS - if (parsenleft == -1 && parsefile->strpush->ap && - parsenextc[-1] != ' ' && parsenextc[-1] != '\t') { - return PEOA; - } + TRACE(("dowait(%d) called\n", block)); + pid = waitproc(block, &status); + TRACE(("wait returns pid %d, status=%d\n", pid, status)); + if (pid <= 0) + return pid; + INT_OFF; + thisjob = NULL; + for (jp = curjob; jp; jp = jp->prev_job) { + struct procstat *sp; + struct procstat *spend; + if (jp->state == JOBDONE) + continue; + state = JOBDONE; + spend = jp->ps + jp->nprocs; + sp = jp->ps; + do { + if (sp->pid == pid) { + TRACE(("Job %d: changing status of proc %d " + "from 0x%x to 0x%x\n", + jobno(jp), pid, sp->status, status)); + sp->status = status; + thisjob = jp; + } + if (sp->status == -1) + state = JOBRUNNING; +#if JOBS + if (state == JOBRUNNING) + continue; + if (WIFSTOPPED(sp->status)) { + jp->stopstatus = sp->status; + state = JOBSTOPPED; + } #endif - popstring(); - if (--parsenleft >= 0) - return SC2INT(*parsenextc++); + } while (++sp < spend); + if (thisjob) + goto gotjob; } - if (parsenleft == EOF_NLEFT || parsefile->buf == NULL) - return PEOF; - flushall(); +#if JOBS + if (!WIFSTOPPED(status)) +#endif - more = parselleft; - if (more <= 0) { -again: - if ((more = preadfd()) <= 0) { - parselleft = parsenleft = EOF_NLEFT; - return PEOF; + jobless--; + goto out; + + gotjob: + if (state != JOBRUNNING) { + thisjob->changed = 1; + + if (thisjob->state != state) { + TRACE(("Job %d: changing state from %d to %d\n", + jobno(thisjob), thisjob->state, state)); + thisjob->state = state; +#if JOBS + if (state == JOBSTOPPED) { + set_curjob(thisjob, CUR_STOPPED); + } +#endif + } + } + + out: + INT_ON; + + if (thisjob && thisjob == job) { + char s[48 + 1]; + int len; + + len = sprint_status(s, status, 1); + if (len) { + s[len] = '\n'; + s[len + 1] = 0; + out2str(s); } } + return pid; +} - q = parsenextc; +#if JOBS +static void +showjob(FILE *out, struct job *jp, int mode) +{ + struct procstat *ps; + struct procstat *psend; + int col; + int indent_col; + char s[80]; - /* delete nul characters */ - for (;;) { - int c; + ps = jp->ps; - more--; - c = *q; + if (mode & SHOW_PGID) { + /* just output process (group) id of pipeline */ + fprintf(out, "%d\n", ps->pid); + return; + } - if (!c) - memmove(q, q + 1, more); - else { - q++; - if (c == '\n') { - parsenleft = q - parsenextc - 1; - break; - } - } + col = fmtstr(s, 16, "[%d] ", jobno(jp)); + indent_col = col; - if (more <= 0) { - parsenleft = q - parsenextc - 1; - if (parsenleft < 0) - goto again; - break; - } - } - parselleft = more; + if (jp == curjob) + s[col - 2] = '+'; + else if (curjob && jp == curjob->prev_job) + s[col - 2] = '-'; - savec = *q; - *q = '\0'; + if (mode & SHOW_PID) + col += fmtstr(s + col, 16, "%d ", ps->pid); - if (vflag) { - out2str(parsenextc); + psend = ps + jp->nprocs; + + if (jp->state == JOBRUNNING) { + strcpy(s + col, "Running"); + col += sizeof("Running") - 1; + } else { + int status = psend[-1].status; + if (jp->state == JOBSTOPPED) + status = jp->stopstatus; + col += sprint_status(s + col, status, 0); } - *q = savec; + goto start; - return SC2INT(*parsenextc++); -} + do { + /* for each process */ + col = fmtstr(s, 48, " |\n%*c%d ", indent_col, ' ', ps->pid) - 3; + start: + fprintf(out, "%s%*c%s", + s, 33 - col >= 0 ? 33 - col : 0, ' ', ps->cmd + ); + if (!(mode & SHOW_PID)) { + showpipe(jp, out); + break; + } + if (++ps == psend) { + outcslow('\n', out); + break; + } + } while (1); -/* - * Undo the last call to pgetc. Only one character may be pushed back. - * PEOF may be pushed back. - */ + jp->changed = 0; -void -pungetc(void) -{ - parsenleft++; - parsenextc--; + if (jp->state == JOBDONE) { + TRACE(("showjob: freeing job %d\n", jobno(jp))); + freejob(jp); + } } /* - * Push a string back onto the input at this current parsefile level. - * We handle aliases this way. + * Print a list of jobs. If "change" is nonzero, only print jobs whose + * statuses have changed since the last call to showjobs. */ -void -pushstring(char *s, void *ap) +static void +showjobs(FILE *out, int mode) { - struct strpush *sp; - size_t len; + struct job *jp; - len = strlen(s); - INTOFF; -/*dprintf("*** calling pushstring: %s, %d\n", s, len);*/ - if (parsefile->strpush) { - sp = ckmalloc(sizeof (struct strpush)); - sp->prev = parsefile->strpush; - parsefile->strpush = sp; - } else - sp = parsefile->strpush = &(parsefile->basestrpush); - sp->prevstring = parsenextc; - sp->prevnleft = parsenleft; -#ifdef CONFIG_ASH_ALIAS - sp->ap = (struct alias *)ap; - if (ap) { - ((struct alias *)ap)->flag |= ALIASINUSE; - sp->string = s; - } -#endif - parsenextc = s; - parsenleft = len; - INTON; -} + TRACE(("showjobs(%x) called\n", mode)); -void -popstring(void) -{ - struct strpush *sp = parsefile->strpush; + /* If not even one one job changed, there is nothing to do */ + while (dowait(DOWAIT_NORMAL, NULL) > 0) + continue; - INTOFF; -#ifdef CONFIG_ASH_ALIAS - if (sp->ap) { - if (parsenextc[-1] == ' ' || parsenextc[-1] == '\t') { - checkkwd |= CHKALIAS; - } - if (sp->string != sp->ap->val) { - ckfree(sp->string); - } - sp->ap->flag &= ~ALIASINUSE; - if (sp->ap->flag & ALIASDEAD) { - unalias(sp->ap->name); + for (jp = curjob; jp; jp = jp->prev_job) { + if (!(mode & SHOW_CHANGED) || jp->changed) { + showjob(out, jp, mode); } } -#endif - parsenextc = sp->prevstring; - parsenleft = sp->prevnleft; -/*dprintf("*** calling popstring: restoring to '%s'\n", parsenextc);*/ - parsefile->strpush = sp->prev; - if (sp != &(parsefile->basestrpush)) - ckfree(sp); - INTON; } -/* - * Set the input to take input from a file. If push is set, push the - * old input onto the stack first. - */ - static int -setinputfile(const char *fname, int flags) +jobscmd(int argc, char **argv) { - int fd; - int fd2; + int mode, m; - INTOFF; - if ((fd = open(fname, O_RDONLY)) < 0) { - if (flags & INPUT_NOFILE_OK) - goto out; - sh_error("Can't open %s", fname); - } - if (fd < 10) { - fd2 = copyfd(fd, 10); - close(fd); - if (fd2 < 0) - sh_error("Out of file descriptors"); - fd = fd2; + mode = 0; + while ((m = nextopt("lp"))) { + if (m == 'l') + mode = SHOW_PID; + else + mode = SHOW_PGID; } - setinputfd(fd, flags & INPUT_PUSH_FILE); -out: - INTON; - return fd; -} + argv = argptr; + if (*argv) { + do + showjob(stdout, getjob(*argv,0), mode); + while (*++argv); + } else + showjobs(stdout, mode); -/* - * Like setinputfile, but takes an open file descriptor. Call this with - * interrupts off. - */ + return 0; +} +#endif /* JOBS */ -static void -setinputfd(int fd, int push) +static int +getstatus(struct job *job) { - (void) fcntl(fd, F_SETFD, FD_CLOEXEC); - if (push) { - pushfile(); - parsefile->buf = 0; + int status; + int retval; + + status = job->ps[job->nprocs - 1].status; + retval = WEXITSTATUS(status); + if (!WIFEXITED(status)) { +#if JOBS + retval = WSTOPSIG(status); + if (!WIFSTOPPED(status)) +#endif + { + /* XXX: limits number of signals */ + retval = WTERMSIG(status); +#if JOBS + if (retval == SIGINT) + job->sigint = 1; +#endif + } + retval += 128; } - parsefile->fd = fd; - if (parsefile->buf == NULL) - parsefile->buf = ckmalloc(IBUFSIZ); - parselleft = parsenleft = 0; - plinno = 1; + TRACE(("getstatus: job %d, nproc %d, status %x, retval %x\n", + jobno(job), job->nprocs, status, retval)); + return retval; } - -/* - * Like setinputfile, but takes input from a string. - */ - -static void -setinputstring(char *string) +static int +waitcmd(int argc, char **argv) { - INTOFF; - pushfile(); - parsenextc = string; - parsenleft = strlen(string); - parsefile->buf = NULL; - plinno = 1; - INTON; -} + struct job *job; + int retval; + struct job *jp; + EXSIGON; -/* - * To handle the "." command, a stack of input files is used. Pushfile - * adds a new entry to the stack and popfile restores the previous level. - */ + nextopt(nullstr); + retval = 0; + + argv = argptr; + if (!*argv) { + /* wait for all jobs */ + for (;;) { + jp = curjob; + while (1) { + if (!jp) { + /* no running procs */ + goto out; + } + if (jp->state == JOBRUNNING) + break; + jp->waited = 1; + jp = jp->prev_job; + } + dowait(DOWAIT_BLOCK, 0); + } + } -static void -pushfile(void) -{ - struct parsefile *pf; + retval = 127; + do { + if (**argv != '%') { + pid_t pid = number(*argv); + job = curjob; + goto start; + do { + if (job->ps[job->nprocs - 1].pid == pid) + break; + job = job->prev_job; + start: + if (!job) + goto repeat; + } while (1); + } else + job = getjob(*argv, 0); + /* loop until process terminated or stopped */ + while (job->state == JOBRUNNING) + dowait(DOWAIT_BLOCK, 0); + job->waited = 1; + retval = getstatus(job); + repeat: + ; + } while (*++argv); - parsefile->nleft = parsenleft; - parsefile->lleft = parselleft; - parsefile->nextc = parsenextc; - parsefile->linno = plinno; - pf = (struct parsefile *)ckmalloc(sizeof (struct parsefile)); - pf->prev = parsefile; - pf->fd = -1; - pf->strpush = NULL; - pf->basestrpush.prev = NULL; - parsefile = pf; + out: + return retval; } - -static void -popfile(void) +static struct job * +growjobtab(void) { - struct parsefile *pf = parsefile; + size_t len; + ptrdiff_t offset; + struct job *jp, *jq; - INTOFF; - if (pf->fd >= 0) - close(pf->fd); - if (pf->buf) - ckfree(pf->buf); - while (pf->strpush) - popstring(); - parsefile = pf->prev; - ckfree(pf); - parsenleft = parsefile->nleft; - parselleft = parsefile->lleft; - parsenextc = parsefile->nextc; - plinno = parsefile->linno; - INTON; -} + len = njobs * sizeof(*jp); + jq = jobtab; + jp = ckrealloc(jq, len + 4 * sizeof(*jp)); + offset = (char *)jp - (char *)jq; + if (offset) { + /* Relocate pointers */ + size_t l = len; -/* - * Return to top level. - */ + jq = (struct job *)((char *)jq + l); + while (l) { + l -= sizeof(*jp); + jq--; +#define joff(p) ((struct job *)((char *)(p) + l)) +#define jmove(p) (p) = (void *)((char *)(p) + offset) + if (joff(jp)->ps == &jq->ps0) + jmove(joff(jp)->ps); + if (joff(jp)->prev_job) + jmove(joff(jp)->prev_job); + } + if (curjob) + jmove(curjob); +#undef joff +#undef jmove + } -static void -popallfiles(void) -{ - while (parsefile != &basepf) - popfile(); + njobs += 4; + jobtab = jp; + jp = (struct job *)((char *)jp + len); + jq = jp + 3; + do { + jq->used = 0; + } while (--jq >= jp); + return jp; } - /* - * Close the file(s) that the shell is reading commands from. Called - * after a fork is done. + * Return a new job structure. + * Called with interrupts off. */ - -static void -closescript(void) +static struct job * +makejob(union node *node, int nprocs) { - popallfiles(); - if (parsefile->fd > 0) { - close(parsefile->fd); - parsefile->fd = 0; - } -} - -/* jobs.c */ - -/* mode flags for set_curjob */ -#define CUR_DELETE 2 -#define CUR_RUNNING 1 -#define CUR_STOPPED 0 - -/* mode flags for dowait */ -#define DOWAIT_NORMAL 0 -#define DOWAIT_BLOCK 1 + int i; + struct job *jp; -/* array of jobs */ -static struct job *jobtab; -/* size of array */ -static unsigned njobs; + for (i = njobs, jp = jobtab; ; jp++) { + if (--i < 0) { + jp = growjobtab(); + break; + } + if (jp->used == 0) + break; + if (jp->state != JOBDONE || !jp->waited) + continue; #if JOBS -/* pgrp of shell on invocation */ -static int initialpgrp; -static int ttyfd = -1; + if (jobctl) + continue; #endif -/* current job */ -static struct job *curjob; -/* number of presumed living untracked jobs */ -static int jobless; + freejob(jp); + break; + } + memset(jp, 0, sizeof(*jp)); +#if JOBS + /* jp->jobctl is a bitfield. + * "jp->jobctl |= jobctl" likely to give awful code */ + if (jobctl) + jp->jobctl = 1; +#endif + jp->prev_job = curjob; + curjob = jp; + jp->used = 1; + jp->ps = &jp->ps0; + if (nprocs > 1) { + jp->ps = ckmalloc(nprocs * sizeof(struct procstat)); + } + TRACE(("makejob(0x%lx, %d) returns %%%d\n", (long)node, nprocs, + jobno(jp))); + return jp; +} -static void set_curjob(struct job *, unsigned); #if JOBS -static int restartjob(struct job *, int); -static void xtcsetpgrp(int, pid_t); -static char *commandtext(union node *); -static void cmdlist(union node *, int); -static void cmdtxt(union node *); -static void cmdputs(const char *); -static void showpipe(struct job *, FILE *); -#endif -static int sprint_status(char *, int, int); -static void freejob(struct job *); -static struct job *getjob(const char *, int); -static struct job *growjobtab(void); -static void forkchild(struct job *, union node *, int); -static void forkparent(struct job *, union node *, int, pid_t); -static int dowait(int, struct job *); -static int getstatus(struct job *); +/* + * Return a string identifying a command (to be printed by the + * jobs command). + */ +static char *cmdnextc; static void -set_curjob(struct job *jp, unsigned mode) +cmdputs(const char *s) { - struct job *jp1; - struct job **jpp, **curp; + const char *p, *str; + char c, cc[2] = " "; + char *nextc; + int subtype = 0; + int quoted = 0; + static const char vstype[VSTYPE + 1][4] = { + "", "}", "-", "+", "?", "=", + "%", "%%", "#", "##" + }; - /* first remove from list */ - jpp = curp = &curjob; - do { - jp1 = *jpp; - if (jp1 == jp) + nextc = makestrspace((strlen(s) + 1) * 8, cmdnextc); + p = s; + while ((c = *p++) != 0) { + str = 0; + switch (c) { + case CTLESC: + c = *p++; break; - jpp = &jp1->prev_job; - } while (1); - *jpp = jp1->prev_job; - - /* Then re-insert in correct position */ - jpp = curp; - switch (mode) { - default: -#if DEBUG - abort(); -#endif - case CUR_DELETE: - /* job being deleted */ - break; - case CUR_RUNNING: - /* newly created job or backgrounded job, - put after all stopped jobs. */ - do { - jp1 = *jpp; -#if JOBS - if (!jp1 || jp1->state != JOBSTOPPED) -#endif - break; - jpp = &jp1->prev_job; - } while (1); - /* FALLTHROUGH */ -#if JOBS - case CUR_STOPPED: + case CTLVAR: + subtype = *p++; + if ((subtype & VSTYPE) == VSLENGTH) + str = "${#"; + else + str = "${"; + if (!(subtype & VSQUOTE) == !(quoted & 1)) + goto dostr; + quoted ^= 1; + c = '"'; + break; + case CTLENDVAR: + str = "\"}" + !(quoted & 1); + quoted >>= 1; + subtype = 0; + goto dostr; + case CTLBACKQ: + str = "$(...)"; + goto dostr; + case CTLBACKQ+CTLQUOTE: + str = "\"$(...)\""; + goto dostr; +#if ENABLE_ASH_MATH_SUPPORT + case CTLARI: + str = "$(("; + goto dostr; + case CTLENDARI: + str = "))"; + goto dostr; #endif - /* newly stopped job - becomes curjob */ - jp->prev_job = *jpp; - *jpp = jp; - break; + case CTLQUOTEMARK: + quoted ^= 1; + c = '"'; + break; + case '=': + if (subtype == 0) + break; + if ((subtype & VSTYPE) != VSNORMAL) + quoted <<= 1; + str = vstype[subtype & VSTYPE]; + if (subtype & VSNUL) + c = ':'; + else + goto checkstr; + break; + case '\'': + case '\\': + case '"': + case '$': + /* These can only happen inside quotes */ + cc[0] = c; + str = cc; + c = '\\'; + break; + default: + break; + } + USTPUTC(c, nextc); + checkstr: + if (!str) + continue; + dostr: + while ((c = *str++)) { + USTPUTC(c, nextc); + } } + if (quoted & 1) { + USTPUTC('"', nextc); + } + *nextc = 0; + cmdnextc = nextc; } -#if JOBS -/* - * Turn job control on and off. - * - * Note: This code assumes that the third arg to ioctl is a character - * pointer, which is true on Berkeley systems but not System V. Since - * System V doesn't have job control yet, this isn't a problem now. - * - * Called with interrupts off. - */ +/* cmdtxt() and cmdlist() call each other */ +static void cmdtxt(union node *n); -void -setjobctl(int on) +static void +cmdlist(union node *np, int sep) { - int fd; - int pgrp; - - if (on == jobctl || rootshell == 0) - return; - if (on) { - int ofd; - ofd = fd = open(_PATH_TTY, O_RDWR); - if (fd < 0) { - fd += 3; - while (!isatty(fd) && --fd >= 0) - ; - } - fd = fcntl(fd, F_DUPFD, 10); - close(ofd); - if (fd < 0) - goto out; - fcntl(fd, F_SETFD, FD_CLOEXEC); - do { /* while we are in the background */ - if ((pgrp = tcgetpgrp(fd)) < 0) { -out: - sh_warnx("can't access tty; job control turned off"); - mflag = on = 0; - goto close; - } - if (pgrp == getpgrp()) - break; - killpg(0, SIGTTIN); - } while (1); - initialpgrp = pgrp; - - setsignal(SIGTSTP); - setsignal(SIGTTOU); - setsignal(SIGTTIN); - pgrp = rootpid; - setpgid(0, pgrp); - xtcsetpgrp(fd, pgrp); - } else { - /* turning job control off */ - fd = ttyfd; - pgrp = initialpgrp; - xtcsetpgrp(fd, pgrp); - setpgid(0, pgrp); - setsignal(SIGTSTP); - setsignal(SIGTTOU); - setsignal(SIGTTIN); -close: - close(fd); - fd = -1; + for (; np; np = np->narg.next) { + if (!sep) + cmdputs(" "); + cmdtxt(np); + if (sep && np->narg.next) + cmdputs(" "); } - ttyfd = fd; - jobctl = on; } -static int -killcmd(int argc, char **argv) +static void +cmdtxt(union node *n) { - int signo = -1; - int list = 0; - int i; - pid_t pid; - struct job *jp; - - if (argc <= 1) { -usage: - sh_error( -"Usage: kill [-s sigspec | -signum | -sigspec] [pid | job]... or\n" -"kill -l [exitstatus]" - ); - } - - if (**++argv == '-') { - signo = get_signum(*argv + 1); - if (signo < 0) { - int c; + union node *np; + struct nodelist *lp; + const char *p; + char s[2]; - while ((c = nextopt("ls:")) != '\0') - switch (c) { - default: + if (!n) + return; + switch (n->type) { + default: #if DEBUG - abort(); + abort(); #endif - case 'l': - list = 1; - break; - case 's': - signo = get_signum(optionarg); - if (signo < 0) { - sh_error( - "invalid signal number or name: %s", - optionarg - ); - } - break; - } - argv = argptr; - } else - argv++; - } - - if (!list && signo < 0) - signo = SIGTERM; - - if ((signo < 0 || !*argv) ^ list) { - goto usage; - } - - if (list) { - const char *name; - - if (!*argv) { - for (i = 1; i < NSIG; i++) { - name = get_signame(i); - if (isdigit(*name)) - out1fmt(snlfmt, name); - } - return 0; + case NPIPE: + lp = n->npipe.cmdlist; + for (;;) { + cmdtxt(lp->n); + lp = lp->next; + if (!lp) + break; + cmdputs(" | "); } - name = get_signame(signo); - if (isdigit(*name)) - out1fmt(snlfmt, name); - else - sh_error("invalid signal number or exit status: %s", *argptr); - return 0; - } - - i = 0; - do { - if (**argv == '%') { - jp = getjob(*argv, 0); - pid = -jp->ps[0].pid; - } else { - pid = **argv == '-' ? - -number(*argv + 1) : number(*argv); + break; + case NSEMI: + p = "; "; + goto binop; + case NAND: + p = " && "; + goto binop; + case NOR: + p = " || "; + binop: + cmdtxt(n->nbinary.ch1); + cmdputs(p); + n = n->nbinary.ch2; + goto donode; + case NREDIR: + case NBACKGND: + n = n->nredir.n; + goto donode; + case NNOT: + cmdputs("!"); + n = n->nnot.com; + donode: + cmdtxt(n); + break; + case NIF: + cmdputs("if "); + cmdtxt(n->nif.test); + cmdputs("; then "); + n = n->nif.ifpart; + if (n->nif.elsepart) { + cmdtxt(n); + cmdputs("; else "); + n = n->nif.elsepart; } - if (kill(pid, signo) != 0) { - sh_warnx("(%d) - %m", pid); - i = 1; + p = "; fi"; + goto dotail; + case NSUBSHELL: + cmdputs("("); + n = n->nredir.n; + p = ")"; + goto dotail; + case NWHILE: + p = "while "; + goto until; + case NUNTIL: + p = "until "; + until: + cmdputs(p); + cmdtxt(n->nbinary.ch1); + n = n->nbinary.ch2; + p = "; done"; + dodo: + cmdputs("; do "); + dotail: + cmdtxt(n); + goto dotail2; + case NFOR: + cmdputs("for "); + cmdputs(n->nfor.var); + cmdputs(" in "); + cmdlist(n->nfor.args, 1); + n = n->nfor.body; + p = "; done"; + goto dodo; + case NDEFUN: + cmdputs(n->narg.text); + p = "() { ... }"; + goto dotail2; + case NCMD: + cmdlist(n->ncmd.args, 1); + cmdlist(n->ncmd.redirect, 0); + break; + case NARG: + p = n->narg.text; + dotail2: + cmdputs(p); + break; + case NHERE: + case NXHERE: + p = "<<..."; + goto dotail2; + case NCASE: + cmdputs("case "); + cmdputs(n->ncase.expr->narg.text); + cmdputs(" in "); + for (np = n->ncase.cases; np; np = np->nclist.next) { + cmdtxt(np->nclist.pattern); + cmdputs(") "); + cmdtxt(np->nclist.body); + cmdputs(";; "); + } + p = "esac"; + goto dotail2; + case NTO: + p = ">"; + goto redir; + case NCLOBBER: + p = ">|"; + goto redir; + case NAPPEND: + p = ">>"; + goto redir; + case NTOFD: + p = ">&"; + goto redir; + case NFROM: + p = "<"; + goto redir; + case NFROMFD: + p = "<&"; + goto redir; + case NFROMTO: + p = "<>"; + redir: + s[0] = n->nfile.fd + '0'; + s[1] = '\0'; + cmdputs(s); + cmdputs(p); + if (n->type == NTOFD || n->type == NFROMFD) { + s[0] = n->ndup.dupfd + '0'; + p = s; + goto dotail2; } - } while (*++argv); - - return i; + n = n->nfile.fname; + goto donode; + } } -#endif /* JOBS */ -#if defined(JOBS) || DEBUG -static int -jobno(const struct job *jp) +static char * +commandtext(union node *n) { - return jp - jobtab + 1; + char *name; + + STARTSTACKSTR(cmdnextc); + cmdtxt(n); + name = stackblock(); + TRACE(("commandtext: name %p, end %p\n\t\"%s\"\n", + name, cmdnextc, cmdnextc)); + return ckstrdup(name); } -#endif +#endif /* JOBS */ -#if JOBS -static int -fgcmd(int argc, char **argv) +/* + * Fork off a subshell. If we are doing job control, give the subshell its + * own process group. Jp is a job structure that the job is to be added to. + * N is the command that will be evaluated by the child. Both jp and n may + * be NULL. The mode parameter can be one of the following: + * FORK_FG - Fork off a foreground process. + * FORK_BG - Fork off a background process. + * FORK_NOJOB - Like FORK_FG, but don't give the process its own + * process group even if job control is on. + * + * When job control is turned off, background processes have their standard + * input redirected to /dev/null (except for the second and later processes + * in a pipeline). + * + * Called with interrupts off. + */ +/* + * Clear traps on a fork. + */ +static void +clear_traps(void) { - struct job *jp; - FILE *out; - int mode; - int retval; + char **tp; - mode = (**argv == 'f') ? FORK_FG : FORK_BG; - nextopt(nullstr); - argv = argptr; - out = stdout; - do { - jp = getjob(*argv, 1); - if (mode == FORK_BG) { - set_curjob(jp, CUR_RUNNING); - fprintf(out, "[%d] ", jobno(jp)); + for (tp = trap; tp < &trap[NSIG]; tp++) { + if (*tp && **tp) { /* trap not NULL or SIG_IGN */ + INT_OFF; + free(*tp); + *tp = NULL; + if (tp != &trap[0]) + setsignal(tp - trap); + INT_ON; } - outstr(jp->ps->cmd, out); - showpipe(jp, out); - retval = restartjob(jp, mode); - } while (*argv && *++argv); - return retval; + } } -static int bgcmd(int, char **) __attribute__((__alias__("fgcmd"))); - +/* Lives far away from here, needed for forkchild */ +static void closescript(void); -static int -restartjob(struct job *jp, int mode) +/* Called after fork(), in child */ +static void +forkchild(struct job *jp, union node *n, int mode) { - struct procstat *ps; - int i; - int status; - pid_t pgid; - - INTOFF; - if (jp->state == JOBDONE) - goto out; - jp->state = JOBRUNNING; - pgid = jp->ps->pid; - if (mode == FORK_FG) - xtcsetpgrp(ttyfd, pgid); - killpg(pgid, SIGCONT); - ps = jp->ps; - i = jp->nprocs; - do { - if (WIFSTOPPED(ps->status)) { - ps->status = -1; - } - } while (ps++, --i); -out: - status = (mode == FORK_FG) ? waitforjob(jp) : 0; - INTON; - return status; -} -#endif + int oldlvl; -static int -sprint_status(char *s, int status, int sigonly) -{ - int col; - int st; + TRACE(("Child shell %d\n", getpid())); + oldlvl = shlvl; + shlvl++; - col = 0; - if (!WIFEXITED(status)) { + closescript(); + clear_traps(); #if JOBS - if (WIFSTOPPED(status)) - st = WSTOPSIG(status); + /* do job control only in root shell */ + jobctl = 0; + if (mode != FORK_NOJOB && jp->jobctl && !oldlvl) { + pid_t pgrp; + + if (jp->nprocs == 0) + pgrp = getpid(); else + pgrp = jp->ps[0].pid; + /* This can fail because we are doing it in the parent also */ + (void)setpgid(0, pgrp); + if (mode == FORK_FG) + xtcsetpgrp(ttyfd, pgrp); + setsignal(SIGTSTP); + setsignal(SIGTTOU); + } else #endif - st = WTERMSIG(status); - if (sigonly) { - if (st == SIGINT || st == SIGPIPE) - goto out; -#if JOBS - if (WIFSTOPPED(status)) - goto out; -#endif - } - st &= 0x7f; - col = fmtstr(s, 32, strsignal(st)); - if (WCOREDUMP(status)) { - col += fmtstr(s + col, 16, " (core dumped)"); + if (mode == FORK_BG) { + ignoresig(SIGINT); + ignoresig(SIGQUIT); + if (jp->nprocs == 0) { + close(0); + if (open(bb_dev_null, O_RDONLY) != 0) + ash_msg_and_raise_error("can't open %s", bb_dev_null); } - } else if (!sigonly) { - st = WEXITSTATUS(status); - if (st) - col = fmtstr(s, 16, "Done(%d)", st); - else - col = fmtstr(s, 16, "Done"); } - -out: - return col; + if (!oldlvl && iflag) { + setsignal(SIGINT); + setsignal(SIGQUIT); + setsignal(SIGTERM); + } + for (jp = curjob; jp; jp = jp->prev_job) + freejob(jp); + jobless = 0; } -#if JOBS +/* Called after fork(), in parent */ static void -showjob(FILE *out, struct job *jp, int mode) +forkparent(struct job *jp, union node *n, int mode, pid_t pid) { - struct procstat *ps; - struct procstat *psend; - int col; - int indent; - char s[80]; - - ps = jp->ps; - - if (mode & SHOW_PGID) { - /* just output process (group) id of pipeline */ - fprintf(out, "%d\n", ps->pid); + TRACE(("In parent shell: child = %d\n", pid)); + if (!jp) { + while (jobless && dowait(DOWAIT_NORMAL, 0) > 0); + jobless++; return; } +#if JOBS + if (mode != FORK_NOJOB && jp->jobctl) { + int pgrp; - col = fmtstr(s, 16, "[%d] ", jobno(jp)); - indent = col; - - if (jp == curjob) - s[col - 2] = '+'; - else if (curjob && jp == curjob->prev_job) - s[col - 2] = '-'; - - if (mode & SHOW_PID) - col += fmtstr(s + col, 16, "%d ", ps->pid); - - psend = ps + jp->nprocs; - - if (jp->state == JOBRUNNING) { - scopy("Running", s + col); - col += strlen("Running"); - } else { - int status = psend[-1].status; + if (jp->nprocs == 0) + pgrp = pid; + else + pgrp = jp->ps[0].pid; + /* This can fail because we are doing it in the child also */ + setpgid(pid, pgrp); + } +#endif + if (mode == FORK_BG) { + backgndpid = pid; /* set $! */ + set_curjob(jp, CUR_RUNNING); + } + if (jp) { + struct procstat *ps = &jp->ps[jp->nprocs++]; + ps->pid = pid; + ps->status = -1; + ps->cmd = nullstr; #if JOBS - if (jp->state == JOBSTOPPED) - status = jp->stopstatus; + if (jobctl && n) + ps->cmd = commandtext(n); #endif - col += sprint_status(s + col, status, 0); } +} - goto start; - - do { - /* for each process */ - col = fmtstr(s, 48, " |\n%*c%d ", indent, ' ', ps->pid) - 3; +static int +forkshell(struct job *jp, union node *n, int mode) +{ + int pid; -start: - fprintf(out, "%s%*c%s", - s, 33 - col >= 0 ? 33 - col : 0, ' ', ps->cmd - ); - if (!(mode & SHOW_PID)) { - showpipe(jp, out); - break; - } - if (++ps == psend) { - outcslow('\n', out); - break; - } - } while (1); + TRACE(("forkshell(%%%d, %p, %d) called\n", jobno(jp), n, mode)); + pid = fork(); + if (pid < 0) { + TRACE(("Fork failed, errno=%d", errno)); + if (jp) + freejob(jp); + ash_msg_and_raise_error("cannot fork"); + } + if (pid == 0) + forkchild(jp, n, mode); + else + forkparent(jp, n, mode, pid); + return pid; +} - jp->changed = 0; +/* + * Wait for job to finish. + * + * Under job control we have the problem that while a child process is + * running interrupts generated by the user are sent to the child but not + * to the shell. This means that an infinite loop started by an inter- + * active user may be hard to kill. With job control turned off, an + * interactive user may place an interactive program inside a loop. If + * the interactive program catches interrupts, the user doesn't want + * these interrupts to also abort the loop. The approach we take here + * is to have the shell ignore interrupt signals while waiting for a + * foreground process to terminate, and then send itself an interrupt + * signal if the child process was terminated by an interrupt signal. + * Unfortunately, some programs want to do a bit of cleanup and then + * exit on interrupt; unless these processes terminate themselves by + * sending a signal to themselves (instead of calling exit) they will + * confuse this approach. + * + * Called with interrupts off. + */ +static int +waitforjob(struct job *jp) +{ + int st; - if (jp->state == JOBDONE) { - TRACE(("showjob: freeing job %d\n", jobno(jp))); - freejob(jp); + TRACE(("waitforjob(%%%d) called\n", jobno(jp))); + while (jp->state == JOBRUNNING) { + dowait(DOWAIT_BLOCK, jp); + } + st = getstatus(jp); +#if JOBS + if (jp->jobctl) { + xtcsetpgrp(ttyfd, rootpid); + /* + * This is truly gross. + * If we're doing job control, then we did a TIOCSPGRP which + * caused us (the shell) to no longer be in the controlling + * session -- so we wouldn't have seen any ^C/SIGINT. So, we + * intuit from the subprocess exit status whether a SIGINT + * occurred, and if so interrupt ourselves. Yuck. - mycroft + */ + if (jp->sigint) + raise(SIGINT); } + if (jp->state == JOBDONE) +#endif + freejob(jp); + return st; } - +/* + * return 1 if there are stopped jobs, otherwise 0 + */ static int -jobscmd(int argc, char **argv) +stoppedjobs(void) { - int mode, m; - FILE *out; + struct job *jp; + int retval; - mode = 0; - while ((m = nextopt("lp"))) - if (m == 'l') - mode = SHOW_PID; - else - mode = SHOW_PGID; + retval = 0; + if (job_warning) + goto out; + jp = curjob; + if (jp && jp->state == JOBSTOPPED) { + out2str("You have stopped jobs.\n"); + job_warning = 2; + retval++; + } + out: + return retval; +} - out = stdout; - argv = argptr; - if (*argv) - do - showjob(out, getjob(*argv,0), mode); - while (*++argv); - else - showjobs(out, mode); - return 0; -} +/* ============ redir.c + * + * Code for dealing with input/output redirection. + */ +#define EMPTY -2 /* marks an unused slot in redirtab */ +#ifndef PIPE_BUF +# define PIPESIZE 4096 /* amount of buffering in a pipe */ +#else +# define PIPESIZE PIPE_BUF +#endif /* - * Print a list of jobs. If "change" is nonzero, only print jobs whose - * statuses have changed since the last call to showjobs. + * Open a file in noclobber mode. + * The code was copied from bash. */ - -static void -showjobs(FILE *out, int mode) +static int +noclobberopen(const char *fname) { - struct job *jp; + int r, fd; + struct stat finfo, finfo2; - TRACE(("showjobs(%x) called\n", mode)); + /* + * If the file exists and is a regular file, return an error + * immediately. + */ + r = stat(fname, &finfo); + if (r == 0 && S_ISREG(finfo.st_mode)) { + errno = EEXIST; + return -1; + } - /* If not even one one job changed, there is nothing to do */ - while (dowait(DOWAIT_NORMAL, NULL) > 0) - continue; + /* + * If the file was not present (r != 0), make sure we open it + * exclusively so that if it is created before we open it, our open + * will fail. Make sure that we do not truncate an existing file. + * Note that we don't turn on O_EXCL unless the stat failed -- if the + * file was not a regular file, we leave O_EXCL off. + */ + if (r != 0) + return open(fname, O_WRONLY|O_CREAT|O_EXCL, 0666); + fd = open(fname, O_WRONLY|O_CREAT, 0666); - for (jp = curjob; jp; jp = jp->prev_job) { - if (!(mode & SHOW_CHANGED) || jp->changed) - showjob(out, jp, mode); - } + /* If the open failed, return the file descriptor right away. */ + if (fd < 0) + return fd; + + /* + * OK, the open succeeded, but the file may have been changed from a + * non-regular file to a regular file between the stat and the open. + * We are assuming that the O_EXCL open handles the case where FILENAME + * did not exist and is symlinked to an existing file between the stat + * and open. + */ + + /* + * If we can open it and fstat the file descriptor, and neither check + * revealed that it was a regular file, and the file has not been + * replaced, return the file descriptor. + */ + if (fstat(fd, &finfo2) == 0 && !S_ISREG(finfo2.st_mode) + && finfo.st_dev == finfo2.st_dev && finfo.st_ino == finfo2.st_ino) + return fd; + + /* The file has been replaced. badness. */ + close(fd); + errno = EEXIST; + return -1; } -#endif /* JOBS */ /* - * Mark a job structure as unused. + * Handle here documents. Normally we fork off a process to write the + * data to a pipe. If the document is short, we can stuff the data in + * the pipe without forking. */ - -static void -freejob(struct job *jp) +/* openhere needs this forward reference */ +static void expandhere(union node *arg, int fd); +static int +openhere(union node *redir) { - struct procstat *ps; - int i; + int pip[2]; + size_t len = 0; - INTOFF; - for (i = jp->nprocs, ps = jp->ps ; --i >= 0 ; ps++) { - if (ps->cmd != nullstr) - ckfree(ps->cmd); + if (pipe(pip) < 0) + ash_msg_and_raise_error("pipe call failed"); + if (redir->type == NHERE) { + len = strlen(redir->nhere.doc->narg.text); + if (len <= PIPESIZE) { + full_write(pip[1], redir->nhere.doc->narg.text, len); + goto out; + } } - if (jp->ps != &jp->ps0) - ckfree(jp->ps); - jp->used = 0; - set_curjob(jp, CUR_DELETE); - INTON; + if (forkshell((struct job *)NULL, (union node *)NULL, FORK_NOJOB) == 0) { + close(pip[0]); + signal(SIGINT, SIG_IGN); + signal(SIGQUIT, SIG_IGN); + signal(SIGHUP, SIG_IGN); +#ifdef SIGTSTP + signal(SIGTSTP, SIG_IGN); +#endif + signal(SIGPIPE, SIG_DFL); + if (redir->type == NHERE) + full_write(pip[1], redir->nhere.doc->narg.text, len); + else + expandhere(redir->nhere.doc, pip[1]); + _exit(0); + } + out: + close(pip[1]); + return pip[0]; } - static int -waitcmd(int argc, char **argv) +openredirect(union node *redir) { - struct job *job; - int retval; - struct job *jp; - - EXSIGON(); - - nextopt(nullstr); - retval = 0; + char *fname; + int f; - argv = argptr; - if (!*argv) { - /* wait for all jobs */ - for (;;) { - jp = curjob; - while (1) { - if (!jp) { - /* no running procs */ - goto out; - } - if (jp->state == JOBRUNNING) - break; - jp->waited = 1; - jp = jp->prev_job; - } - dowait(DOWAIT_BLOCK, 0); + switch (redir->nfile.type) { + case NFROM: + fname = redir->nfile.expfname; + f = open(fname, O_RDONLY); + if (f < 0) + goto eopen; + break; + case NFROMTO: + fname = redir->nfile.expfname; + f = open(fname, O_RDWR|O_CREAT|O_TRUNC, 0666); + if (f < 0) + goto ecreate; + break; + case NTO: + /* Take care of noclobber mode. */ + if (Cflag) { + fname = redir->nfile.expfname; + f = noclobberopen(fname); + if (f < 0) + goto ecreate; + break; } - } - - retval = 127; - do { - if (**argv != '%') { - pid_t pid = number(*argv); - job = curjob; - goto start; - do { - if (job->ps[job->nprocs - 1].pid == pid) - break; - job = job->prev_job; -start: - if (!job) - goto repeat; - } while (1); - } else - job = getjob(*argv, 0); - /* loop until process terminated or stopped */ - while (job->state == JOBRUNNING) - dowait(DOWAIT_BLOCK, 0); - job->waited = 1; - retval = getstatus(job); -repeat: - ; - } while (*++argv); + /* FALLTHROUGH */ + case NCLOBBER: + fname = redir->nfile.expfname; + f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666); + if (f < 0) + goto ecreate; + break; + case NAPPEND: + fname = redir->nfile.expfname; + f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666); + if (f < 0) + goto ecreate; + break; + default: +#if DEBUG + abort(); +#endif + /* Fall through to eliminate warning. */ + case NTOFD: + case NFROMFD: + f = -1; + break; + case NHERE: + case NXHERE: + f = openhere(redir); + break; + } -out: - return retval; + return f; + ecreate: + ash_msg_and_raise_error("cannot create %s: %s", fname, errmsg(errno, "nonexistent directory")); + eopen: + ash_msg_and_raise_error("cannot open %s: %s", fname, errmsg(errno, "no such file")); } - /* - * Convert a job name to a job structure. + * Copy a file descriptor to be >= to. Returns -1 + * if the source file descriptor is closed, EMPTY if there are no unused + * file descriptors left. */ - -static struct job * -getjob(const char *name, int getctl) +static int +copyfd(int from, int to) { - struct job *jp; - struct job *found; - const char *err_msg = "No such job: %s"; - unsigned num; - int c; - const char *p; - char *(*match)(const char *, const char *); - - jp = curjob; - p = name; - if (!p) - goto currentjob; + int newfd; - if (*p != '%') - goto err; + newfd = fcntl(from, F_DUPFD, to); + if (newfd < 0) { + if (errno == EMFILE) + return EMPTY; + ash_msg_and_raise_error("%d: %m", from); + } + return newfd; +} - c = *++p; - if (!c) - goto currentjob; +static void +dupredirect(union node *redir, int f) +{ + int fd = redir->nfile.fd; - if (!p[1]) { - if (c == '+' || c == '%') { -currentjob: - err_msg = "No current job"; - goto check; - } else if (c == '-') { - if (jp) - jp = jp->prev_job; - err_msg = "No previous job"; -check: - if (!jp) - goto err; - goto gotit; + if (redir->nfile.type == NTOFD || redir->nfile.type == NFROMFD) { + if (redir->ndup.dupfd >= 0) { /* if not ">&-" */ + copyfd(redir->ndup.dupfd, fd); } + return; } - if (is_number(p)) { - num = atoi(p); - if (num < njobs) { - jp = jobtab + num - 1; - if (jp->used) - goto gotit; - goto err; - } + if (f != fd) { + copyfd(f, fd); + close(f); } +} - match = prefix; - if (*p == '?') { - match = strstr; - p++; +/* + * Process a list of redirection commands. If the REDIR_PUSH flag is set, + * old file descriptors are stashed away so that the redirection can be + * undone by calling popredir. If the REDIR_BACKQ flag is set, then the + * standard output, and the standard error if it becomes a duplicate of + * stdout, is saved in memory. + */ +/* flags passed to redirect */ +#define REDIR_PUSH 01 /* save previous values of file descriptors */ +#define REDIR_SAVEFD2 03 /* set preverrout */ +static void +redirect(union node *redir, int flags) +{ + union node *n; + struct redirtab *sv; + int i; + int fd; + int newfd; + int *p; + nullredirs++; + if (!redir) { + return; } - - found = 0; - while (1) { - if (!jp) - goto err; - if (match(jp->ps[0].cmd, p)) { - if (found) - goto err; - found = jp; - err_msg = "%s: ambiguous"; - } - jp = jp->prev_job; + sv = NULL; + INT_OFF; + if (flags & REDIR_PUSH) { + struct redirtab *q; + q = ckmalloc(sizeof(struct redirtab)); + q->next = redirlist; + redirlist = q; + q->nullredirs = nullredirs - 1; + for (i = 0; i < 10; i++) + q->renamed[i] = EMPTY; + nullredirs = 0; + sv = q; } + n = redir; + do { + fd = n->nfile.fd; + if ((n->nfile.type == NTOFD || n->nfile.type == NFROMFD) + && n->ndup.dupfd == fd) + continue; /* redirect from/to same file descriptor */ -gotit: -#if JOBS - err_msg = "job %s not created under job control"; - if (getctl && jp->jobctl == 0) - goto err; -#endif - return jp; -err: - sh_error(err_msg, name); -} + newfd = openredirect(n); + if (fd == newfd) + continue; + if (sv && *(p = &sv->renamed[fd]) == EMPTY) { + i = fcntl(fd, F_DUPFD, 10); + if (i == -1) { + i = errno; + if (i != EBADF) { + close(newfd); + errno = i; + ash_msg_and_raise_error("%d: %m", fd); + /* NOTREACHED */ + } + } else { + *p = i; + close(fd); + } + } else { + close(fd); + } + dupredirect(n, newfd); + } while ((n = n->nfile.next)); + INT_ON; + if (flags & REDIR_SAVEFD2 && sv && sv->renamed[2] >= 0) + preverrout_fd = sv->renamed[2]; +} /* - * Return a new job structure. - * Called with interrupts off. + * Undo the effects of the last redirection. */ - -static struct job * -makejob(union node *node, int nprocs) +static void +popredir(int drop) { + struct redirtab *rp; int i; - struct job *jp; - for (i = njobs, jp = jobtab ; ; jp++) { - if (--i < 0) { - jp = growjobtab(); - break; + if (--nullredirs >= 0) + return; + INT_OFF; + rp = redirlist; + for (i = 0; i < 10; i++) { + if (rp->renamed[i] != EMPTY) { + if (!drop) { + close(i); + copyfd(rp->renamed[i], i); + } + close(rp->renamed[i]); } - if (jp->used == 0) - break; - if (jp->state != JOBDONE || !jp->waited) - continue; -#if JOBS - if (jobctl) - continue; -#endif - freejob(jp); - break; - } - memset(jp, 0, sizeof(*jp)); -#if JOBS - if (jobctl) - jp->jobctl = 1; -#endif - jp->prev_job = curjob; - curjob = jp; - jp->used = 1; - jp->ps = &jp->ps0; - if (nprocs > 1) { - jp->ps = ckmalloc(nprocs * sizeof (struct procstat)); } - TRACE(("makejob(0x%lx, %d) returns %%%d\n", (long)node, nprocs, - jobno(jp))); - return jp; + redirlist = rp->next; + nullredirs = rp->nullredirs; + free(rp); + INT_ON; } -static struct job * -growjobtab(void) -{ - size_t len; - ptrdiff_t offset; - struct job *jp, *jq; - - len = njobs * sizeof(*jp); - jq = jobtab; - jp = ckrealloc(jq, len + 4 * sizeof(*jp)); - - offset = (char *)jp - (char *)jq; - if (offset) { - /* Relocate pointers */ - size_t l = len; +/* + * Undo all redirections. Called on error or interrupt. + */ - jq = (struct job *)((char *)jq + l); - while (l) { - l -= sizeof(*jp); - jq--; -#define joff(p) ((struct job *)((char *)(p) + l)) -#define jmove(p) (p) = (void *)((char *)(p) + offset) - if (xlikely(joff(jp)->ps == &jq->ps0)) - jmove(joff(jp)->ps); - if (joff(jp)->prev_job) - jmove(joff(jp)->prev_job); - } - if (curjob) - jmove(curjob); -#undef joff -#undef jmove +/* + * Discard all saved file descriptors. + */ +static void +clearredir(int drop) +{ + for (;;) { + nullredirs = 0; + if (!redirlist) + break; + popredir(drop); } +} + +static int +redirectsafe(union node *redir, int flags) +{ + int err; + volatile int saveint; + struct jmploc *volatile savehandler = exception_handler; + struct jmploc jmploc; - njobs += 4; - jobtab = jp; - jp = (struct job *)((char *)jp + len); - jq = jp + 3; - do { - jq->used = 0; - } while (--jq >= jp); - return jp; + SAVE_INT(saveint); + err = setjmp(jmploc.loc) * 2; + if (!err) { + exception_handler = &jmploc; + redirect(redir, flags); + } + exception_handler = savehandler; + if (err && exception != EXERROR) + longjmp(exception_handler->loc, 1); + RESTORE_INT(saveint); + return err; } -/* - * Fork off a subshell. If we are doing job control, give the subshell its - * own process group. Jp is a job structure that the job is to be added to. - * N is the command that will be evaluated by the child. Both jp and n may - * be NULL. The mode parameter can be one of the following: - * FORK_FG - Fork off a foreground process. - * FORK_BG - Fork off a background process. - * FORK_NOJOB - Like FORK_FG, but don't give the process its own - * process group even if job control is on. - * - * When job control is turned off, background processes have their standard - * input redirected to /dev/null (except for the second and later processes - * in a pipeline). +/* ============ Routines to expand arguments to commands * - * Called with interrupts off. + * We have to deal with backquotes, shell variables, and file metacharacters. */ -static void forkchild(struct job *jp, union node *n, int mode) -{ - int oldlvl; +/* + * expandarg flags + */ +#define EXP_FULL 0x1 /* perform word splitting & file globbing */ +#define EXP_TILDE 0x2 /* do normal tilde expansion */ +#define EXP_VARTILDE 0x4 /* expand tildes in an assignment */ +#define EXP_REDIR 0x8 /* file glob for a redirection (1 match only) */ +#define EXP_CASE 0x10 /* keeps quotes around for CASE pattern */ +#define EXP_RECORD 0x20 /* need to record arguments for ifs breakup */ +#define EXP_VARTILDE2 0x40 /* expand tildes after colons only */ +#define EXP_WORD 0x80 /* expand word in parameter expansion */ +#define EXP_QWORD 0x100 /* expand word in quoted parameter expansion */ +/* + * _rmescape() flags + */ +#define RMESCAPE_ALLOC 0x1 /* Allocate a new string */ +#define RMESCAPE_GLOB 0x2 /* Add backslashes for glob */ +#define RMESCAPE_QUOTED 0x4 /* Remove CTLESC unless in quotes */ +#define RMESCAPE_GROW 0x8 /* Grow strings instead of stalloc */ +#define RMESCAPE_HEAP 0x10 /* Malloc strings instead of stalloc */ - TRACE(("Child shell %d\n", getpid())); - oldlvl = shlvl; - shlvl++; +/* + * Structure specifying which parts of the string should be searched + * for IFS characters. + */ +struct ifsregion { + struct ifsregion *next; /* next region in list */ + int begoff; /* offset of start of region */ + int endoff; /* offset of end of region */ + int nulonly; /* search for nul bytes only */ +}; - closescript(); - clear_traps(); -#if JOBS - /* do job control only in root shell */ - jobctl = 0; - if (mode != FORK_NOJOB && jp->jobctl && !oldlvl) { - pid_t pgrp; +struct arglist { + struct strlist *list; + struct strlist **lastp; +}; - if (jp->nprocs == 0) - pgrp = getpid(); - else - pgrp = jp->ps[0].pid; - /* This can fail because we are doing it in the parent also */ - (void)setpgid(0, pgrp); - if (mode == FORK_FG) - xtcsetpgrp(ttyfd, pgrp); - setsignal(SIGTSTP); - setsignal(SIGTTOU); - } else -#endif - if (mode == FORK_BG) { - ignoresig(SIGINT); - ignoresig(SIGQUIT); - if (jp->nprocs == 0) { - close(0); - if (open(bb_dev_null, O_RDONLY) != 0) - sh_error("Can't open %s", bb_dev_null); - } - } - if (!oldlvl && iflag) { - setsignal(SIGINT); - setsignal(SIGQUIT); - setsignal(SIGTERM); - } - for (jp = curjob; jp; jp = jp->prev_job) - freejob(jp); - jobless = 0; -} +/* output of current string */ +static char *expdest; +/* list of back quote expressions */ +static struct nodelist *argbackq; +/* first struct in list of ifs regions */ +static struct ifsregion ifsfirst; +/* last struct in list */ +static struct ifsregion *ifslastp; +/* holds expanded arg list */ +static struct arglist exparg; -static void forkparent(struct job *jp, union node *n, int mode, pid_t pid) +/* + * Our own itoa(). + */ +static int +cvtnum(arith_t num) { - TRACE(("In parent shell: child = %d\n", pid)); - if (!jp) { - while (jobless && dowait(DOWAIT_NORMAL, 0) > 0); - jobless++; - return; - } -#if JOBS - if (mode != FORK_NOJOB && jp->jobctl) { - int pgrp; + int len; - if (jp->nprocs == 0) - pgrp = pid; - else - pgrp = jp->ps[0].pid; - /* This can fail because we are doing it in the child also */ - (void)setpgid(pid, pgrp); - } -#endif - if (mode == FORK_BG) { - backgndpid = pid; /* set $! */ - set_curjob(jp, CUR_RUNNING); - } - if (jp) { - struct procstat *ps = &jp->ps[jp->nprocs++]; - ps->pid = pid; - ps->status = -1; - ps->cmd = nullstr; -#if JOBS - if (jobctl && n) - ps->cmd = commandtext(n); + expdest = makestrspace(32, expdest); +#if ENABLE_ASH_MATH_SUPPORT_64 + len = fmtstr(expdest, 32, "%lld", (long long) num); +#else + len = fmtstr(expdest, 32, "%ld", num); #endif - } + STADJUST(len, expdest); + return len; } -static int -forkshell(struct job *jp, union node *n, int mode) +static size_t +esclen(const char *start, const char *p) { - int pid; + size_t esc = 0; - TRACE(("forkshell(%%%d, %p, %d) called\n", jobno(jp), n, mode)); - pid = fork(); - if (pid < 0) { - TRACE(("Fork failed, errno=%d", errno)); - if (jp) - freejob(jp); - sh_error("Cannot fork"); + while (p > start && *--p == CTLESC) { + esc++; } - if (pid == 0) - forkchild(jp, n, mode); - else - forkparent(jp, n, mode, pid); - return pid; + return esc; } /* - * Wait for job to finish. - * - * Under job control we have the problem that while a child process is - * running interrupts generated by the user are sent to the child but not - * to the shell. This means that an infinite loop started by an inter- - * active user may be hard to kill. With job control turned off, an - * interactive user may place an interactive program inside a loop. If - * the interactive program catches interrupts, the user doesn't want - * these interrupts to also abort the loop. The approach we take here - * is to have the shell ignore interrupt signals while waiting for a - * foreground process to terminate, and then send itself an interrupt - * signal if the child process was terminated by an interrupt signal. - * Unfortunately, some programs want to do a bit of cleanup and then - * exit on interrupt; unless these processes terminate themselves by - * sending a signal to themselves (instead of calling exit) they will - * confuse this approach. - * - * Called with interrupts off. + * Remove any CTLESC characters from a string. */ - -int -waitforjob(struct job *jp) +static char * +_rmescapes(char *str, int flag) { - int st; + static const char qchars[] ALIGN1 = { CTLESC, CTLQUOTEMARK, '\0' }; - TRACE(("waitforjob(%%%d) called\n", jobno(jp))); - while (jp->state == JOBRUNNING) { - dowait(DOWAIT_BLOCK, jp); + char *p, *q, *r; + unsigned inquotes; + int notescaped; + int globbing; + + p = strpbrk(str, qchars); + if (!p) { + return str; } - st = getstatus(jp); -#if JOBS - if (jp->jobctl) { - xtcsetpgrp(ttyfd, rootpid); - /* - * This is truly gross. - * If we're doing job control, then we did a TIOCSPGRP which - * caused us (the shell) to no longer be in the controlling - * session -- so we wouldn't have seen any ^C/SIGINT. So, we - * intuit from the subprocess exit status whether a SIGINT - * occurred, and if so interrupt ourselves. Yuck. - mycroft - */ - if (jp->sigint) - raise(SIGINT); + q = p; + r = str; + if (flag & RMESCAPE_ALLOC) { + size_t len = p - str; + size_t fulllen = len + strlen(p) + 1; + + if (flag & RMESCAPE_GROW) { + r = makestrspace(fulllen, expdest); + } else if (flag & RMESCAPE_HEAP) { + r = ckmalloc(fulllen); + } else { + r = stalloc(fulllen); + } + q = r; + if (len > 0) { + q = memcpy(q, str, len) + len; + } + } + inquotes = (flag & RMESCAPE_QUOTED) ^ RMESCAPE_QUOTED; + globbing = flag & RMESCAPE_GLOB; + notescaped = globbing; + while (*p) { + if (*p == CTLQUOTEMARK) { + inquotes = ~inquotes; + p++; + notescaped = globbing; + continue; + } + if (*p == '\\') { + /* naked back slash */ + notescaped = 0; + goto copy; + } + if (*p == CTLESC) { + p++; + if (notescaped && inquotes && *p != '/') { + *q++ = '\\'; + } + } + notescaped = globbing; + copy: + *q++ = *p++; } - if (jp->state == JOBDONE) -#endif - freejob(jp); - return st; + *q = '\0'; + if (flag & RMESCAPE_GROW) { + expdest = r; + STADJUST(q - r + 1, expdest); + } + return r; } +#define rmescapes(p) _rmescapes((p), 0) +#define pmatch(a, b) !fnmatch((a), (b), 0) /* - * Do a wait system call. If job control is compiled in, we accept - * stopped processes. If block is zero, we return a value of zero - * rather than blocking. - * - * System V doesn't have a non-blocking wait system call. It does - * have a SIGCLD signal that is sent to a process when one of it's - * children dies. The obvious way to use SIGCLD would be to install - * a handler for SIGCLD which simply bumped a counter when a SIGCLD - * was received, and have waitproc bump another counter when it got - * the status of a process. Waitproc would then know that a wait - * system call would not block if the two counters were different. - * This approach doesn't work because if a process has children that - * have not been waited for, System V will send it a SIGCLD when it - * installs a signal handler for SIGCLD. What this means is that when - * a child exits, the shell will be sent SIGCLD signals continuously - * until is runs out of stack space, unless it does a wait call before - * restoring the signal handler. The code below takes advantage of - * this (mis)feature by installing a signal handler for SIGCLD and - * then checking to see whether it was called. If there are any - * children to be waited for, it will be. + * Prepare a pattern for a expmeta (internal glob(3)) call. * - * If neither SYSV nor BSD is defined, we don't implement nonblocking - * waits at all. In this case, the user will not be informed when - * a background process until the next time she runs a real program - * (as opposed to running a builtin command or just typing return), - * and the jobs command may give out of date information. + * Returns an stalloced string. */ +static char * +preglob(const char *pattern, int quoted, int flag) +{ + flag |= RMESCAPE_GLOB; + if (quoted) { + flag |= RMESCAPE_QUOTED; + } + return _rmescapes((char *)pattern, flag); +} -static int waitproc(int block, int *status) +/* + * Put a string on the stack. + */ +static void +memtodest(const char *p, size_t len, int syntax, int quotes) { - int flags = 0; + char *q = expdest; -#if JOBS - if (jobctl) - flags |= WUNTRACED; -#endif - if (block == 0) - flags |= WNOHANG; - return wait3(status, flags, (struct rusage *)NULL); + q = makestrspace(len * 2, q); + + while (len--) { + int c = signed_char2int(*p++); + if (!c) + continue; + if (quotes && (SIT(c, syntax) == CCTL || SIT(c, syntax) == CBACK)) + USTPUTC(CTLESC, q); + USTPUTC(c, q); + } + + expdest = q; +} + +static void +strtodest(const char *p, int syntax, int quotes) +{ + memtodest(p, strlen(p), syntax, quotes); } /* - * Wait for a process to terminate. + * Record the fact that we have to scan this region of the + * string for IFS characters. */ +static void +recordregion(int start, int end, int nulonly) +{ + struct ifsregion *ifsp; -static int -dowait(int block, struct job *job) + if (ifslastp == NULL) { + ifsp = &ifsfirst; + } else { + INT_OFF; + ifsp = ckmalloc(sizeof(*ifsp)); + ifsp->next = NULL; + ifslastp->next = ifsp; + INT_ON; + } + ifslastp = ifsp; + ifslastp->begoff = start; + ifslastp->endoff = end; + ifslastp->nulonly = nulonly; +} + +static void +removerecordregions(int endoff) { - int pid; - int status; - struct job *jp; - struct job *thisjob; - int state; + if (ifslastp == NULL) + return; - TRACE(("dowait(%d) called\n", block)); - pid = waitproc(block, &status); - TRACE(("wait returns pid %d, status=%d\n", pid, status)); - if (pid <= 0) - return pid; - INTOFF; - thisjob = NULL; - for (jp = curjob; jp; jp = jp->prev_job) { - struct procstat *sp; - struct procstat *spend; - if (jp->state == JOBDONE) - continue; - state = JOBDONE; - spend = jp->ps + jp->nprocs; - sp = jp->ps; - do { - if (sp->pid == pid) { - TRACE(("Job %d: changing status of proc %d from 0x%x to 0x%x\n", jobno(jp), pid, sp->status, status)); - sp->status = status; - thisjob = jp; - } - if (sp->status == -1) - state = JOBRUNNING; -#if JOBS - if (state == JOBRUNNING) - continue; - if (WIFSTOPPED(sp->status)) { - jp->stopstatus = sp->status; - state = JOBSTOPPED; - } -#endif - } while (++sp < spend); - if (thisjob) - goto gotjob; + if (ifsfirst.endoff > endoff) { + while (ifsfirst.next != NULL) { + struct ifsregion *ifsp; + INT_OFF; + ifsp = ifsfirst.next->next; + free(ifsfirst.next); + ifsfirst.next = ifsp; + INT_ON; + } + if (ifsfirst.begoff > endoff) + ifslastp = NULL; + else { + ifslastp = &ifsfirst; + ifsfirst.endoff = endoff; + } + return; } -#if JOBS - if (!WIFSTOPPED(status)) -#endif - jobless--; - goto out; + ifslastp = &ifsfirst; + while (ifslastp->next && ifslastp->next->begoff < endoff) + ifslastp=ifslastp->next; + while (ifslastp->next != NULL) { + struct ifsregion *ifsp; + INT_OFF; + ifsp = ifslastp->next->next; + free(ifslastp->next); + ifslastp->next = ifsp; + INT_ON; + } + if (ifslastp->endoff > endoff) + ifslastp->endoff = endoff; +} -gotjob: - if (state != JOBRUNNING) { - thisjob->changed = 1; +static char * +exptilde(char *startp, char *p, int flag) +{ + char c; + char *name; + struct passwd *pw; + const char *home; + int quotes = flag & (EXP_FULL | EXP_CASE); + int startloc; - if (thisjob->state != state) { - TRACE(("Job %d: changing state from %d to %d\n", jobno(thisjob), thisjob->state, state)); - thisjob->state = state; -#if JOBS - if (state == JOBSTOPPED) { - set_curjob(thisjob, CUR_STOPPED); - } -#endif + name = p + 1; + + while ((c = *++p) != '\0') { + switch (c) { + case CTLESC: + return startp; + case CTLQUOTEMARK: + return startp; + case ':': + if (flag & EXP_VARTILDE) + goto done; + break; + case '/': + case CTLENDVAR: + goto done; } } + done: + *p = '\0'; + if (*name == '\0') { + home = lookupvar(homestr); + } else { + pw = getpwnam(name); + if (pw == NULL) + goto lose; + home = pw->pw_dir; + } + if (!home || !*home) + goto lose; + *p = c; + startloc = expdest - (char *)stackblock(); + strtodest(home, SQSYNTAX, quotes); + recordregion(startloc, expdest - (char *)stackblock(), 0); + return p; + lose: + *p = c; + return startp; +} + +/* + * Execute a command inside back quotes. If it's a builtin command, we + * want to save its output in a block obtained from malloc. Otherwise + * we fork off a subprocess and get the output of the command via a pipe. + * Should be called with interrupts off. + */ +struct backcmd { /* result of evalbackcmd */ + int fd; /* file descriptor to read from */ + char *buf; /* buffer */ + int nleft; /* number of chars in buffer */ + struct job *jp; /* job structure for command */ +}; + +/* These forward decls are needed to use "eval" code for backticks handling: */ +static int back_exitstatus; /* exit status of backquoted command */ +#define EV_EXIT 01 /* exit after evaluating tree */ +static void evaltree(union node *, int); + +static void +evalbackcmd(union node *n, struct backcmd *result) +{ + int saveherefd; + + result->fd = -1; + result->buf = NULL; + result->nleft = 0; + result->jp = NULL; + if (n == NULL) { + goto out; + } -out: - INTON; + saveherefd = herefd; + herefd = -1; - if (thisjob && thisjob == job) { - char s[48 + 1]; - int len; + { + int pip[2]; + struct job *jp; - len = sprint_status(s, status, 1); - if (len) { - s[len] = '\n'; - s[len + 1] = 0; - out2str(s); + if (pipe(pip) < 0) + ash_msg_and_raise_error("pipe call failed"); + jp = makejob(n, 1); + if (forkshell(jp, n, FORK_NOJOB) == 0) { + FORCE_INT_ON; + close(pip[0]); + if (pip[1] != 1) { + close(1); + copyfd(pip[1], 1); + close(pip[1]); + } + eflag = 0; + evaltree(n, EV_EXIT); /* actually evaltreenr... */ + /* NOTREACHED */ } + close(pip[1]); + result->fd = pip[0]; + result->jp = jp; } - return pid; + herefd = saveherefd; + out: + TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n", + result->fd, result->buf, result->nleft, result->jp)); } - /* - * return 1 if there are stopped jobs, otherwise 0 + * Expand stuff in backwards quotes. */ - -int -stoppedjobs(void) +static void +expbackq(union node *cmd, int quoted, int quotes) { - struct job *jp; - int retval; - - retval = 0; - if (job_warning) - goto out; - jp = curjob; - if (jp && jp->state == JOBSTOPPED) { - out2str("You have stopped jobs.\n"); - job_warning = 2; - retval++; - } + struct backcmd in; + int i; + char buf[128]; + char *p; + char *dest; + int startloc; + int syntax = quoted? DQSYNTAX : BASESYNTAX; + struct stackmark smark; -out: - return retval; -} + INT_OFF; + setstackmark(&smark); + dest = expdest; + startloc = dest - (char *)stackblock(); + grabstackstr(dest); + evalbackcmd(cmd, &in); + popstackmark(&smark); -/* - * Return a string identifying a command (to be printed by the - * jobs command). - */ + p = in.buf; + i = in.nleft; + if (i == 0) + goto read; + for (;;) { + memtodest(p, i, syntax, quotes); + read: + if (in.fd < 0) + break; + i = safe_read(in.fd, buf, sizeof(buf)); + TRACE(("expbackq: read returns %d\n", i)); + if (i <= 0) + break; + p = buf; + } -#if JOBS -static char *cmdnextc; + free(in.buf); + if (in.fd >= 0) { + close(in.fd); + back_exitstatus = waitforjob(in.jp); + } + INT_ON; -static char * -commandtext(union node *n) -{ - char *name; + /* Eat all trailing newlines */ + dest = expdest; + for (; dest > (char *)stackblock() && dest[-1] == '\n';) + STUNPUTC(dest); + expdest = dest; - STARTSTACKSTR(cmdnextc); - cmdtxt(n); - name = stackblock(); - TRACE(("commandtext: name %p, end %p\n\t\"%s\"\n", - name, cmdnextc, cmdnextc)); - return savestr(name); + if (quoted == 0) + recordregion(startloc, dest - (char *)stackblock(), 0); + TRACE(("evalbackq: size=%d: \"%.*s\"\n", + (dest - (char *)stackblock()) - startloc, + (dest - (char *)stackblock()) - startloc, + stackblock() + startloc)); } +#if ENABLE_ASH_MATH_SUPPORT +/* + * Expand arithmetic expression. Backup to start of expression, + * evaluate, place result in (backed up) result, adjust string position. + */ static void -cmdtxt(union node *n) +expari(int quotes) { - union node *np; - struct nodelist *lp; - const char *p; - char s[2]; + char *p, *start; + int begoff; + int flag; + int len; - if (!n) - return; - switch (n->type) { - default: -#if DEBUG - abort(); -#endif - case NPIPE: - lp = n->npipe.cmdlist; - for (;;) { - cmdtxt(lp->n); - lp = lp->next; - if (!lp) - break; - cmdputs(" | "); - } - break; - case NSEMI: - p = "; "; - goto binop; - case NAND: - p = " && "; - goto binop; - case NOR: - p = " || "; -binop: - cmdtxt(n->nbinary.ch1); - cmdputs(p); - n = n->nbinary.ch2; - goto donode; - case NREDIR: - case NBACKGND: - n = n->nredir.n; - goto donode; - case NNOT: - cmdputs("!"); - n = n->nnot.com; -donode: - cmdtxt(n); - break; - case NIF: - cmdputs("if "); - cmdtxt(n->nif.test); - cmdputs("; then "); - n = n->nif.ifpart; - if (n->nif.elsepart) { - cmdtxt(n); - cmdputs("; else "); - n = n->nif.elsepart; - } - p = "; fi"; - goto dotail; - case NSUBSHELL: - cmdputs("("); - n = n->nredir.n; - p = ")"; - goto dotail; - case NWHILE: - p = "while "; - goto until; - case NUNTIL: - p = "until "; -until: - cmdputs(p); - cmdtxt(n->nbinary.ch1); - n = n->nbinary.ch2; - p = "; done"; -dodo: - cmdputs("; do "); -dotail: - cmdtxt(n); - goto dotail2; - case NFOR: - cmdputs("for "); - cmdputs(n->nfor.var); - cmdputs(" in "); - cmdlist(n->nfor.args, 1); - n = n->nfor.body; - p = "; done"; - goto dodo; - case NDEFUN: - cmdputs(n->narg.text); - p = "() { ... }"; - goto dotail2; - case NCMD: - cmdlist(n->ncmd.args, 1); - cmdlist(n->ncmd.redirect, 0); - break; - case NARG: - p = n->narg.text; -dotail2: - cmdputs(p); - break; - case NHERE: - case NXHERE: - p = "<<..."; - goto dotail2; - case NCASE: - cmdputs("case "); - cmdputs(n->ncase.expr->narg.text); - cmdputs(" in "); - for (np = n->ncase.cases; np; np = np->nclist.next) { - cmdtxt(np->nclist.pattern); - cmdputs(") "); - cmdtxt(np->nclist.body); - cmdputs(";; "); - } - p = "esac"; - goto dotail2; - case NTO: - p = ">"; - goto redir; - case NCLOBBER: - p = ">|"; - goto redir; - case NAPPEND: - p = ">>"; - goto redir; - case NTOFD: - p = ">&"; - goto redir; - case NFROM: - p = "<"; - goto redir; - case NFROMFD: - p = "<&"; - goto redir; - case NFROMTO: - p = "<>"; -redir: - s[0] = n->nfile.fd + '0'; - s[1] = '\0'; - cmdputs(s); - cmdputs(p); - if (n->type == NTOFD || n->type == NFROMFD) { - s[0] = n->ndup.dupfd + '0'; - p = s; - goto dotail2; - } else { - n = n->nfile.fname; - goto donode; + /* ifsfree(); */ + + /* + * This routine is slightly over-complicated for + * efficiency. Next we scan backwards looking for the + * start of arithmetic. + */ + start = stackblock(); + p = expdest - 1; + *p = '\0'; + p--; + do { + int esc; + + while (*p != CTLARI) { + p--; +#if DEBUG + if (p < start) { + ash_msg_and_raise_error("missing CTLARI (shouldn't happen)"); + } +#endif } - } -} -static void -cmdlist(union node *np, int sep) -{ - for (; np; np = np->narg.next) { - if (!sep) - cmdputs(spcstr); - cmdtxt(np); - if (sep && np->narg.next) - cmdputs(spcstr); - } + esc = esclen(start, p); + if (!(esc % 2)) { + break; + } + + p -= esc + 1; + } while (1); + + begoff = p - start; + + removerecordregions(begoff); + + flag = p[1]; + + expdest = p; + + if (quotes) + rmescapes(p + 2); + + len = cvtnum(dash_arith(p + 2)); + + if (flag != '"') + recordregion(begoff, begoff + len, 0); } +#endif + +/* argstr needs it */ +static char *evalvar(char *p, int flag); +/* + * Perform variable and command substitution. If EXP_FULL is set, output CTLESC + * characters to allow for further processing. Otherwise treat + * $@ like $* since no splitting will be performed. + */ static void -cmdputs(const char *s) +argstr(char *p, int flag) { - const char *p, *str; - char c, cc[2] = " "; - char *nextc; - int subtype = 0; - int quoted = 0; - static const char vstype[VSTYPE + 1][4] = { - "", "}", "-", "+", "?", "=", - "%", "%%", "#", "##" + static const char spclchars[] ALIGN1 = { + '=', + ':', + CTLQUOTEMARK, + CTLENDVAR, + CTLESC, + CTLVAR, + CTLBACKQ, + CTLBACKQ | CTLQUOTE, +#if ENABLE_ASH_MATH_SUPPORT + CTLENDARI, +#endif + 0 }; - nextc = makestrspace((strlen(s) + 1) * 8, cmdnextc); - p = s; - while ((c = *p++) != 0) { - str = 0; + const char *reject = spclchars; + int c; + int quotes = flag & (EXP_FULL | EXP_CASE); /* do CTLESC */ + int breakall = flag & EXP_WORD; + int inquotes; + size_t length; + int startloc; + + if (!(flag & EXP_VARTILDE)) { + reject += 2; + } else if (flag & EXP_VARTILDE2) { + reject++; + } + inquotes = 0; + length = 0; + if (flag & EXP_TILDE) { + char *q; + + flag &= ~EXP_TILDE; + tilde: + q = p; + if (*q == CTLESC && (flag & EXP_QWORD)) + q++; + if (*q == '~') + p = exptilde(p, q, flag); + } + start: + startloc = expdest - (char *)stackblock(); + for (;;) { + length += strcspn(p + length, reject); + c = p[length]; + if (c && (!(c & 0x80) +#if ENABLE_ASH_MATH_SUPPORT + || c == CTLENDARI +#endif + )) { + /* c == '=' || c == ':' || c == CTLENDARI */ + length++; + } + if (length > 0) { + int newloc; + expdest = stack_nputstr(p, length, expdest); + newloc = expdest - (char *)stackblock(); + if (breakall && !inquotes && newloc > startloc) { + recordregion(startloc, newloc, 0); + } + startloc = newloc; + } + p += length + 1; + length = 0; + switch (c) { - case CTLESC: - c = *p++; + case '\0': + goto breakloop; + case '=': + if (flag & EXP_VARTILDE2) { + p--; + continue; + } + flag |= EXP_VARTILDE2; + reject++; + /* fall through */ + case ':': + /* + * sort of a hack - expand tildes in variable + * assignments (after the first '=' and after ':'s). + */ + if (*--p == '~') { + goto tilde; + } + continue; + } + + switch (c) { + case CTLENDVAR: /* ??? */ + goto breakloop; + case CTLQUOTEMARK: + /* "$@" syntax adherence hack */ + if ( + !inquotes && + !memcmp(p, dolatstr, 4) && + (p[4] == CTLQUOTEMARK || ( + p[4] == CTLENDVAR && + p[5] == CTLQUOTEMARK + )) + ) { + p = evalvar(p + 1, flag) + 1; + goto start; + } + inquotes = !inquotes; + addquote: + if (quotes) { + p--; + length++; + startloc++; + } break; + case CTLESC: + startloc++; + length++; + goto addquote; case CTLVAR: - subtype = *p++; - if ((subtype & VSTYPE) == VSLENGTH) - str = "${#"; - else - str = "${"; - if (!(subtype & VSQUOTE) != !(quoted & 1)) { - quoted ^= 1; - c = '"'; - } else - goto dostr; - break; - case CTLENDVAR: - str = "\"}" + !(quoted & 1); - quoted >>= 1; - subtype = 0; - goto dostr; + p = evalvar(p, flag); + goto start; case CTLBACKQ: - str = "$(...)"; - goto dostr; - case CTLBACKQ+CTLQUOTE: - str = "\"$(...)\""; - goto dostr; -#ifdef CONFIG_ASH_MATH_SUPPORT - case CTLARI: - str = "$(("; - goto dostr; + c = 0; + case CTLBACKQ|CTLQUOTE: + expbackq(argbackq->n, c, quotes); + argbackq = argbackq->next; + goto start; +#if ENABLE_ASH_MATH_SUPPORT case CTLENDARI: - str = "))"; - goto dostr; + p--; + expari(quotes); + goto start; #endif - case CTLQUOTEMARK: - quoted ^= 1; - c = '"'; - break; - case '=': - if (subtype == 0) - break; - if ((subtype & VSTYPE) != VSNORMAL) - quoted <<= 1; - str = vstype[subtype & VSTYPE]; - if (subtype & VSNUL) - c = ':'; - else - goto checkstr; - break; - case '\'': - case '\\': - case '"': - case '$': - /* These can only happen inside quotes */ - cc[0] = c; - str = cc; - c = '\\'; - break; - default: - break; } - USTPUTC(c, nextc); -checkstr: - if (!str) - continue; -dostr: - while ((c = *str++)) { - USTPUTC(c, nextc); + } + breakloop: + ; +} + +static char * +scanleft(char *startp, char *rmesc, char *rmescend, char *str, int quotes, + int zero) +{ + char *loc; + char *loc2; + char c; + + loc = startp; + loc2 = rmesc; + do { + int match; + const char *s = loc2; + c = *loc2; + if (zero) { + *loc2 = '\0'; + s = rmesc; } - } - if (quoted & 1) { - USTPUTC('"', nextc); - } - *nextc = 0; - cmdnextc = nextc; + match = pmatch(str, s); + *loc2 = c; + if (match) + return loc; + if (quotes && *loc == CTLESC) + loc++; + loc++; + loc2++; + } while (c); + return 0; } - -static void -showpipe(struct job *jp, FILE *out) +static char * +scanright(char *startp, char *rmesc, char *rmescend, char *str, int quotes, + int zero) { - struct procstat *sp; - struct procstat *spend; + int esc = 0; + char *loc; + char *loc2; - spend = jp->ps + jp->nprocs; - for (sp = jp->ps + 1; sp < spend; sp++) - fprintf(out, " | %s", sp->cmd); - outcslow('\n', out); - flushall(); + for (loc = str - 1, loc2 = rmescend; loc >= startp; loc2--) { + int match; + char c = *loc2; + const char *s = loc2; + if (zero) { + *loc2 = '\0'; + s = rmesc; + } + match = pmatch(str, s); + *loc2 = c; + if (match) + return loc; + loc--; + if (quotes) { + if (--esc < 0) { + esc = esclen(startp, loc); + } + if (esc % 2) { + esc--; + loc--; + } + } + } + return 0; } +static void varunset(const char *, const char *, const char *, int) ATTRIBUTE_NORETURN; static void -xtcsetpgrp(int fd, pid_t pgrp) +varunset(const char *end, const char *var, const char *umsg, int varflags) { - if (tcsetpgrp(fd, pgrp)) - sh_error("Cannot set tty process group (%m)"); -} -#endif /* JOBS */ - -static int -getstatus(struct job *job) { - int status; - int retval; + const char *msg; + const char *tail; - status = job->ps[job->nprocs - 1].status; - retval = WEXITSTATUS(status); - if (!WIFEXITED(status)) { -#if JOBS - retval = WSTOPSIG(status); - if (!WIFSTOPPED(status)) -#endif - { - /* XXX: limits number of signals */ - retval = WTERMSIG(status); -#if JOBS - if (retval == SIGINT) - job->sigint = 1; -#endif - } - retval += 128; + tail = nullstr; + msg = "parameter not set"; + if (umsg) { + if (*end == CTLENDVAR) { + if (varflags & VSNUL) + tail = " or null"; + } else + msg = umsg; } - TRACE(("getstatus: job %d, nproc %d, status %x, retval %x\n", - jobno(job), job->nprocs, status, retval)); - return retval; + ash_msg_and_raise_error("%.*s: %s%s", end - var - 1, var, msg, tail); } -#ifdef CONFIG_ASH_MAIL -/* mail.c */ - -/* - * Routines to check for mail. (Perhaps make part of main.c?) - */ - -#define MAXMBOXES 10 - -/* times of mailboxes */ -static time_t mailtime[MAXMBOXES]; -/* Set if MAIL or MAILPATH is changed. */ -static int mail_var_path_changed; - +static const char * +subevalvar(char *p, char *str, int strloc, int subtype, int startloc, int varflags, int quotes) +{ + char *startp; + char *loc; + int saveherefd = herefd; + struct nodelist *saveargbackq = argbackq; + int amount; + char *rmesc, *rmescend; + int zero; + char *(*scan)(char *, char *, char *, char *, int , int); + herefd = -1; + argstr(p, subtype != VSASSIGN && subtype != VSQUESTION ? EXP_CASE : 0); + STPUTC('\0', expdest); + herefd = saveherefd; + argbackq = saveargbackq; + startp = stackblock() + startloc; -/* - * Print appropriate message(s) if mail has arrived. - * If mail_var_path_changed is set, - * then the value of MAIL has mail_var_path_changed, - * so we just update the values. - */ + switch (subtype) { + case VSASSIGN: + setvar(str, startp, 0); + amount = startp - expdest; + STADJUST(amount, expdest); + return startp; -static void -chkmail(void) -{ - const char *mpath; - char *p; - char *q; - time_t *mtp; - struct stackmark smark; - struct stat statb; + case VSQUESTION: + varunset(p, str, startp, varflags); + /* NOTREACHED */ + } - setstackmark(&smark); - mpath = mpathset() ? mpathval() : mailval(); - for (mtp = mailtime; mtp < mailtime + MAXMBOXES; mtp++) { - p = padvance(&mpath, nullstr); - if (p == NULL) - break; - if (*p == '\0') - continue; - for (q = p ; *q ; q++); + subtype -= VSTRIMRIGHT; #if DEBUG - if (q[-1] != '/') - abort(); + if (subtype < 0 || subtype > 3) + abort(); #endif - q[-1] = '\0'; /* delete trailing '/' */ - if (stat(p, &statb) < 0) { - *mtp = 0; - continue; + + rmesc = startp; + rmescend = stackblock() + strloc; + if (quotes) { + rmesc = _rmescapes(startp, RMESCAPE_ALLOC | RMESCAPE_GROW); + if (rmesc != startp) { + rmescend = expdest; + startp = stackblock() + startloc; } - if (!mail_var_path_changed && statb.st_mtime != *mtp) { - fprintf( - stderr, snlfmt, - pathopt ? pathopt : "you have mail" - ); + } + rmescend--; + str = stackblock() + strloc; + preglob(str, varflags & VSQUOTE, 0); + + /* zero = subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX */ + zero = subtype >> 1; + /* VSTRIMLEFT/VSTRIMRIGHTMAX -> scanleft */ + scan = (subtype & 1) ^ zero ? scanleft : scanright; + + loc = scan(startp, rmesc, rmescend, str, quotes, zero); + if (loc) { + if (zero) { + memmove(startp, loc, str - loc); + loc = startp + (str - loc) - 1; } - *mtp = statb.st_mtime; + *loc = '\0'; + amount = loc - expdest; + STADJUST(amount, expdest); } - mail_var_path_changed = 0; - popstackmark(&smark); + return loc; } - -static void -changemail(const char *val) +/* + * Add the value of a specialized variable to the stack string. + */ +static ssize_t +varvalue(char *name, int varflags, int flags) { - mail_var_path_changed++; -} + int num; + char *p; + int i; + int sep = 0; + int sepq = 0; + ssize_t len = 0; + char **ap; + int syntax; + int quoted = varflags & VSQUOTE; + int subtype = varflags & VSTYPE; + int quotes = flags & (EXP_FULL | EXP_CASE); + + if (quoted && (flags & EXP_FULL)) + sep = 1 << CHAR_BIT; + + syntax = quoted ? DQSYNTAX : BASESYNTAX; + switch (*name) { + case '$': + num = rootpid; + goto numvar; + case '?': + num = exitstatus; + goto numvar; + case '#': + num = shellparam.nparam; + goto numvar; + case '!': + num = backgndpid; + if (num == 0) + return -1; + numvar: + len = cvtnum(num); + break; + case '-': + p = makestrspace(NOPTS, expdest); + for (i = NOPTS - 1; i >= 0; i--) { + if (optlist[i]) { + USTPUTC(optletters(i), p); + len++; + } + } + expdest = p; + break; + case '@': + if (sep) + goto param; + /* fall through */ + case '*': + sep = ifsset() ? signed_char2int(ifsval()[0]) : ' '; + if (quotes && (SIT(sep, syntax) == CCTL || SIT(sep, syntax) == CBACK)) + sepq = 1; + param: + ap = shellparam.p; + if (!ap) + return -1; + while ((p = *ap++)) { + size_t partlen; -#endif /* CONFIG_ASH_MAIL */ + partlen = strlen(p); + len += partlen; -/* main.c */ + if (!(subtype == VSPLUS || subtype == VSLENGTH)) + memtodest(p, partlen, syntax, quotes); + if (*ap && sep) { + char *q; -#if PROFILE -static short profile_buf[16384]; -extern int etext(); -#endif + len++; + if (subtype == VSPLUS || subtype == VSLENGTH) { + continue; + } + q = expdest; + if (sepq) + STPUTC(CTLESC, q); + STPUTC(sep, q); + expdest = q; + } + } + return len; + case '0': + case '1': + case '2': + case '3': + case '4': + case '5': + case '6': + case '7': + case '8': + case '9': + num = atoi(name); + if (num < 0 || num > shellparam.nparam) + return -1; + p = num ? shellparam.p[num - 1] : arg0; + goto value; + default: + p = lookupvar(name); + value: + if (!p) + return -1; -static int isloginsh; + len = strlen(p); + if (!(subtype == VSPLUS || subtype == VSLENGTH)) + memtodest(p, len, syntax, quotes); + return len; + } -static void read_profile(const char *); + if (subtype == VSPLUS || subtype == VSLENGTH) + STADJUST(-len, expdest); + return len; +} /* - * Main routine. We initialize things, parse the arguments, execute - * profiles if we're a login shell, and then call cmdloop to execute - * commands. The setjmp call sets up the location to jump to when an - * exception occurs. When an exception occurs the variable "state" - * is used to figure out how far we had gotten. + * Expand a variable, and return a pointer to the next character in the + * input string. */ - -int -ash_main(int argc, char **argv) +static char * +evalvar(char *p, int flag) { - char *shinit; - volatile int state; - struct jmploc jmploc; - struct stackmark smark; + int subtype; + int varflags; + char *var; + int patloc; + int c; + int startloc; + ssize_t varlen; + int easy; + int quotes; + int quoted; -#ifdef __GLIBC__ - dash_errno = __errno_location(); -#endif + quotes = flag & (EXP_FULL | EXP_CASE); + varflags = *p++; + subtype = varflags & VSTYPE; + quoted = varflags & VSQUOTE; + var = p; + easy = (!quoted || (*var == '@' && shellparam.nparam)); + startloc = expdest - (char *)stackblock(); + p = strchr(p, '=') + 1; -#if PROFILE - monitor(4, etext, profile_buf, sizeof profile_buf, 50); -#endif - state = 0; - if (setjmp(jmploc.loc)) { - int e; - int s; + again: + varlen = varvalue(var, varflags, flag); + if (varflags & VSNUL) + varlen--; - reset(); + if (subtype == VSPLUS) { + varlen = -1 - varlen; + goto vsplus; + } - e = exception; - if (e == EXERROR) - exitstatus = 2; - s = state; - if (e == EXEXIT || s == 0 || iflag == 0 || shlvl) - exitshell(); + if (subtype == VSMINUS) { + vsplus: + if (varlen < 0) { + argstr( + p, flag | EXP_TILDE | + (quoted ? EXP_QWORD : EXP_WORD) + ); + goto end; + } + if (easy) + goto record; + goto end; + } - if (e == EXINT) { - outcslow('\n', stderr); + if (subtype == VSASSIGN || subtype == VSQUESTION) { + if (varlen < 0) { + if (subevalvar(p, var, 0, subtype, startloc, varflags, 0)) { + varflags &= ~VSNUL; + /* + * Remove any recorded regions beyond + * start of variable + */ + removerecordregions(startloc); + goto again; + } + goto end; } - popstackmark(&smark); - FORCEINTON; /* enable interrupts */ - if (s == 1) - goto state1; - else if (s == 2) - goto state2; - else if (s == 3) - goto state3; - else - goto state4; + if (easy) + goto record; + goto end; + } + + if (varlen < 0 && uflag) + varunset(p, var, 0, 0); + + if (subtype == VSLENGTH) { + cvtnum(varlen > 0 ? varlen : 0); + goto record; + } + + if (subtype == VSNORMAL) { + if (!easy) + goto end; + record: + recordregion(startloc, expdest - (char *)stackblock(), quoted); + goto end; } - handler = &jmploc; + #if DEBUG - opentrace(); - trputs("Shell args: "); trargs(argv); + switch (subtype) { + case VSTRIMLEFT: + case VSTRIMLEFTMAX: + case VSTRIMRIGHT: + case VSTRIMRIGHTMAX: + break; + default: + abort(); + } #endif - rootpid = getpid(); -#ifdef CONFIG_ASH_RANDOM_SUPPORT - rseed = rootpid + ((time_t)time((time_t *)0)); -#endif - init(); - setstackmark(&smark); - procargs(argc, argv); -#ifdef CONFIG_FEATURE_COMMAND_SAVEHISTORY - if ( iflag ) { - const char *hp = lookupvar("HISTFILE"); + if (varlen >= 0) { + /* + * Terminate the string and start recording the pattern + * right after it + */ + STPUTC('\0', expdest); + patloc = expdest - (char *)stackblock(); + if (subevalvar(p, NULL, patloc, subtype, + startloc, varflags, quotes) == 0) { + int amount = expdest - ( + (char *)stackblock() + patloc - 1 + ); + STADJUST(-amount, expdest); + } + /* Remove any recorded regions beyond start of variable */ + removerecordregions(startloc); + goto record; + } - if(hp == NULL ) { - hp = lookupvar("HOME"); - if(hp != NULL) { - char *defhp = concat_path_file(hp, ".ash_history"); - setvar("HISTFILE", defhp, 0); - free(defhp); + end: + if (subtype != VSNORMAL) { /* skip to end of alternative */ + int nesting = 1; + for (;;) { + c = *p++; + if (c == CTLESC) + p++; + else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) { + if (varlen >= 0) + argbackq = argbackq->next; + } else if (c == CTLVAR) { + if ((*p++ & VSTYPE) != VSNORMAL) + nesting++; + } else if (c == CTLENDVAR) { + if (--nesting == 0) + break; } } } -#endif - if (argv[0] && argv[0][0] == '-') - isloginsh = 1; - if (isloginsh) { - state = 1; - read_profile("/etc/profile"); -state1: - state = 2; - read_profile(".profile"); - } -state2: - state = 3; - if ( -#ifndef linux - getuid() == geteuid() && getgid() == getegid() && -#endif - iflag - ) { - if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') { - read_profile(shinit); - } + return p; +} + +/* + * Break the argument string into pieces based upon IFS and add the + * strings to the argument list. The regions of the string to be + * searched for IFS characters have been stored by recordregion. + */ +static void +ifsbreakup(char *string, struct arglist *arglist) +{ + struct ifsregion *ifsp; + struct strlist *sp; + char *start; + char *p; + char *q; + const char *ifs, *realifs; + int ifsspc; + int nulonly; + + start = string; + if (ifslastp != NULL) { + ifsspc = 0; + nulonly = 0; + realifs = ifsset() ? ifsval() : defifs; + ifsp = &ifsfirst; + do { + p = string + ifsp->begoff; + nulonly = ifsp->nulonly; + ifs = nulonly ? nullstr : realifs; + ifsspc = 0; + while (p < string + ifsp->endoff) { + q = p; + if (*p == CTLESC) + p++; + if (!strchr(ifs, *p)) { + p++; + continue; + } + if (!nulonly) + ifsspc = (strchr(defifs, *p) != NULL); + /* Ignore IFS whitespace at start */ + if (q == start && ifsspc) { + p++; + start = p; + continue; + } + *q = '\0'; + sp = stalloc(sizeof(*sp)); + sp->text = start; + *arglist->lastp = sp; + arglist->lastp = &sp->next; + p++; + if (!nulonly) { + for (;;) { + if (p >= string + ifsp->endoff) { + break; + } + q = p; + if (*p == CTLESC) + p++; + if (strchr(ifs, *p) == NULL ) { + p = q; + break; + } else if (strchr(defifs, *p) == NULL) { + if (ifsspc) { + p++; + ifsspc = 0; + } else { + p = q; + break; + } + } else + p++; + } + } + start = p; + } /* while */ + ifsp = ifsp->next; + } while (ifsp != NULL); + if (nulonly) + goto add; } -state3: - state = 4; - if (minusc) - evalstring(minusc, 0); - if (sflag || minusc == NULL) { -#ifdef CONFIG_FEATURE_COMMAND_SAVEHISTORY - if ( iflag ) { - const char *hp = lookupvar("HISTFILE"); + if (!*start) + return; - if(hp != NULL ) - load_history ( hp ); - } -#endif -state4: /* XXX ??? - why isn't this before the "if" statement */ - cmdloop(1); - } -#if PROFILE - monitor(0); -#endif -#ifdef GPROF - { - extern void _mcleanup(void); - _mcleanup(); - } -#endif - exitshell(); - /* NOTREACHED */ + add: + sp = stalloc(sizeof(*sp)); + sp->text = start; + *arglist->lastp = sp; + arglist->lastp = &sp->next; } +static void +ifsfree(void) +{ + struct ifsregion *p; + + INT_OFF; + p = ifsfirst.next; + do { + struct ifsregion *ifsp; + ifsp = p->next; + free(p); + p = ifsp; + } while (p); + ifslastp = NULL; + ifsfirst.next = NULL; + INT_ON; +} /* - * Read and execute commands. "Top" is nonzero for the top level command - * loop; it turns on prompting if the shell is interactive. + * Add a file name to the list. */ - -static int -cmdloop(int top) +static void +addfname(const char *name) { - union node *n; - struct stackmark smark; - int inter; - int numeof = 0; - - TRACE(("cmdloop(%d) called\n", top)); - for (;;) { - int skip; - - setstackmark(&smark); -#if JOBS - if (jobctl) - showjobs(stderr, SHOW_CHANGED); -#endif - inter = 0; - if (iflag && top) { - inter++; -#ifdef CONFIG_ASH_MAIL - chkmail(); -#endif - } - n = parsecmd(inter); - /* showtree(n); DEBUG */ - if (n == NEOF) { - if (!top || numeof >= 50) - break; - if (!stoppedjobs()) { - if (!Iflag) - break; - out2str("\nUse \"exit\" to leave shell.\n"); - } - numeof++; - } else if (nflag == 0) { - job_warning = (job_warning == 2) ? 1 : 0; - numeof = 0; - evaltree(n, 0); - } - popstackmark(&smark); - skip = evalskip; - - if (skip) { - evalskip = 0; - return skip & SKIPEVAL; - } - } + struct strlist *sp; - return 0; + sp = stalloc(sizeof(*sp)); + sp->text = ststrdup(name); + *exparg.lastp = sp; + exparg.lastp = &sp->next; } +static char *expdir; /* - * Read /etc/profile or .profile. Return on error. + * Do metacharacter (i.e. *, ?, [...]) expansion. */ - static void -read_profile(const char *name) +expmeta(char *enddir, char *name) { - int skip; + char *p; + const char *cp; + char *start; + char *endname; + int metaflag; + struct stat statb; + DIR *dirp; + struct dirent *dp; + int atend; + int matchdot; - if (setinputfile(name, INPUT_PUSH_FILE | INPUT_NOFILE_OK) < 0) + metaflag = 0; + start = name; + for (p = name; *p; p++) { + if (*p == '*' || *p == '?') + metaflag = 1; + else if (*p == '[') { + char *q = p + 1; + if (*q == '!') + q++; + for (;;) { + if (*q == '\\') + q++; + if (*q == '/' || *q == '\0') + break; + if (*++q == ']') { + metaflag = 1; + break; + } + } + } else if (*p == '\\') + p++; + else if (*p == '/') { + if (metaflag) + goto out; + start = p + 1; + } + } + out: + if (metaflag == 0) { /* we've reached the end of the file name */ + if (enddir != expdir) + metaflag++; + p = name; + do { + if (*p == '\\') + p++; + *enddir++ = *p; + } while (*p++); + if (metaflag == 0 || lstat(expdir, &statb) >= 0) + addfname(expdir); + return; + } + endname = p; + if (name < start) { + p = name; + do { + if (*p == '\\') + p++; + *enddir++ = *p++; + } while (p < start); + } + if (enddir == expdir) { + cp = "."; + } else if (enddir == expdir + 1 && *expdir == '/') { + cp = "/"; + } else { + cp = expdir; + enddir[-1] = '\0'; + } + dirp = opendir(cp); + if (dirp == NULL) return; + if (enddir != expdir) + enddir[-1] = '/'; + if (*endname == 0) { + atend = 1; + } else { + atend = 0; + *endname++ = '\0'; + } + matchdot = 0; + p = start; + if (*p == '\\') + p++; + if (*p == '.') + matchdot++; + while (! intpending && (dp = readdir(dirp)) != NULL) { + if (dp->d_name[0] == '.' && ! matchdot) + continue; + if (pmatch(start, dp->d_name)) { + if (atend) { + strcpy(enddir, dp->d_name); + addfname(expdir); + } else { + for (p = enddir, cp = dp->d_name; (*p++ = *cp++) != '\0';) + continue; + p[-1] = '/'; + expmeta(p, endname); + } + } + } + closedir(dirp); + if (! atend) + endname[-1] = '/'; +} - skip = cmdloop(0); - popfile(); +static struct strlist * +msort(struct strlist *list, int len) +{ + struct strlist *p, *q = NULL; + struct strlist **lpp; + int half; + int n; - if (skip) - exitshell(); + if (len <= 1) + return list; + half = len >> 1; + p = list; + for (n = half; --n >= 0; ) { + q = p; + p = p->next; + } + q->next = NULL; /* terminate first half of list */ + q = msort(list, half); /* sort first half of list */ + p = msort(p, len - half); /* sort second half */ + lpp = &list; + for (;;) { +#if ENABLE_LOCALE_SUPPORT + if (strcoll(p->text, q->text) < 0) +#else + if (strcmp(p->text, q->text) < 0) +#endif + { + *lpp = p; + lpp = &p->next; + p = *lpp; + if (p == NULL) { + *lpp = q; + break; + } + } else { + *lpp = q; + lpp = &q->next; + q = *lpp; + if (q == NULL) { + *lpp = p; + break; + } + } + } + return list; } - /* - * Read a file containing shell functions. + * Sort the results of file name expansion. It calculates the number of + * strings to sort and then calls msort (short for merge sort) to do the + * work. */ - -static void -readcmdfile(char *name) +static struct strlist * +expsort(struct strlist *str) { - setinputfile(name, INPUT_PUSH_FILE); - cmdloop(0); - popfile(); + int len; + struct strlist *sp; + + len = 0; + for (sp = str; sp; sp = sp->next) + len++; + return msort(str, len); } +static void +expandmeta(struct strlist *str, int flag) +{ + static const char metachars[] ALIGN1 = { + '*', '?', '[', 0 + }; + /* TODO - EXP_REDIR */ -/* - * Take commands from a file. To be compatible we should do a path - * search for the file, which is necessary to find sub-commands. - */ + while (str) { + struct strlist **savelastp; + struct strlist *sp; + char *p; -static char * find_dot_file(char *name) -{ - char *fullname; - const char *path = pathval(); - struct stat statb; + if (fflag) + goto nometa; + if (!strpbrk(str->text, metachars)) + goto nometa; + savelastp = exparg.lastp; - /* don't try this for absolute or relative paths */ - if (strchr(name, '/')) - return name; + INT_OFF; + p = preglob(str->text, 0, RMESCAPE_ALLOC | RMESCAPE_HEAP); + { + int i = strlen(str->text); + expdir = ckmalloc(i < 2048 ? 2048 : i); /* XXX */ + } - while ((fullname = padvance(&path, name)) != NULL) { - if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) { + expmeta(expdir, p); + free(expdir); + if (p != str->text) + free(p); + INT_ON; + if (exparg.lastp == savelastp) { /* - * Don't bother freeing here, since it will - * be freed by the caller. + * no matches */ - return fullname; + nometa: + *exparg.lastp = str; + rmescapes(str->text); + exparg.lastp = &str->next; + } else { + *exparg.lastp = NULL; + *savelastp = sp = expsort(*savelastp); + while (sp->next != NULL) + sp = sp->next; + exparg.lastp = &sp->next; } - stunalloc(fullname); + str = str->next; } - - /* not found in the PATH */ - sh_error(not_found_msg, name); - /* NOTREACHED */ } -static int dotcmd(int argc, char **argv) +/* + * Perform variable substitution and command substitution on an argument, + * placing the resulting list of arguments in arglist. If EXP_FULL is true, + * perform splitting and file name expansion. When arglist is NULL, perform + * here document expansion. + */ +static void +expandarg(union node *arg, struct arglist *arglist, int flag) { struct strlist *sp; - volatile struct shparam saveparam; - int status = 0; - - for (sp = cmdenviron; sp; sp = sp->next) - setvareq(xstrdup(sp->text), VSTRFIXED | VTEXTFIXED); - - if (argc >= 2) { /* That's what SVR2 does */ - char *fullname; - - fullname = find_dot_file(argv[1]); - - if (argc > 2) { - saveparam = shellparam; - shellparam.malloc = 0; - shellparam.nparam = argc - 2; - shellparam.p = argv + 2; - }; - - setinputfile(fullname, INPUT_PUSH_FILE); - commandname = fullname; - cmdloop(0); - popfile(); + char *p; - if (argc > 2) { - freeparam(&shellparam); - shellparam = saveparam; - }; - status = exitstatus; + argbackq = arg->narg.backquote; + STARTSTACKSTR(expdest); + ifsfirst.next = NULL; + ifslastp = NULL; + argstr(arg->narg.text, flag); + p = _STPUTC('\0', expdest); + expdest = p - 1; + if (arglist == NULL) { + return; /* here document expanded */ + } + p = grabstackstr(p); + exparg.lastp = &exparg.list; + /* + * TODO - EXP_REDIR + */ + if (flag & EXP_FULL) { + ifsbreakup(p, &exparg); + *exparg.lastp = NULL; + exparg.lastp = &exparg.list; + expandmeta(exparg.list, flag); + } else { + if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */ + rmescapes(p); + sp = stalloc(sizeof(*sp)); + sp->text = p; + *exparg.lastp = sp; + exparg.lastp = &sp->next; + } + if (ifsfirst.next) + ifsfree(); + *exparg.lastp = NULL; + if (exparg.list) { + *arglist->lastp = exparg.list; + arglist->lastp = exparg.lastp; } - return status; -} - - -static int -exitcmd(int argc, char **argv) -{ - if (stoppedjobs()) - return 0; - if (argc > 1) - exitstatus = number(argv[1]); - exraise(EXEXIT); - /* NOTREACHED */ -} - -#ifdef CONFIG_ASH_BUILTIN_ECHO -static int -echocmd(int argc, char **argv) -{ - return bb_echo(argv); -} -#endif - -#ifdef CONFIG_ASH_BUILTIN_TEST -static int -testcmd(int argc, char **argv) -{ - return bb_test(argc, argv); } -#endif - -/* memalloc.c */ /* - * Same for malloc, realloc, but returns an error when out of space. + * Expand shell variables and backquotes inside a here document. */ - -static pointer -ckrealloc(pointer p, size_t nbytes) -{ - p = realloc(p, nbytes); - if (p == NULL) - sh_error(bb_msg_memory_exhausted); - return p; -} - -static pointer -ckmalloc(size_t nbytes) +static void +expandhere(union node *arg, int fd) { - return ckrealloc(NULL, nbytes); + herefd = fd; + expandarg(arg, (struct arglist *)NULL, 0); + full_write(fd, stackblock(), expdest - (char *)stackblock()); } /* - * Make a copy of a string in safe storage. + * Returns true if the pattern matches the string. */ - -static char * -savestr(const char *s) +static int +patmatch(char *pattern, const char *string) { - char *p = strdup(s); - if (!p) - sh_error(bb_msg_memory_exhausted); - return p; + return pmatch(preglob(pattern, 0, 0), string); } - /* - * Parse trees for commands are allocated in lifo order, so we use a stack - * to make this more efficient, and also to avoid all sorts of exception - * handling code to handle interrupts in the middle of a parse. - * - * The size 504 was chosen because the Ultrix malloc handles that size - * well. + * See if a pattern matches in a case statement. */ - - -static pointer -stalloc(size_t nbytes) +static int +casematch(union node *pattern, char *val) { - char *p; - size_t aligned; - - aligned = SHELL_ALIGN(nbytes); - if (aligned > stacknleft) { - size_t len; - size_t blocksize; - struct stack_block *sp; - - blocksize = aligned; - if (blocksize < MINSIZE) - blocksize = MINSIZE; - len = sizeof(struct stack_block) - MINSIZE + blocksize; - if (len < blocksize) - sh_error(bb_msg_memory_exhausted); - INTOFF; - sp = ckmalloc(len); - sp->prev = stackp; - stacknxt = sp->space; - stacknleft = blocksize; - sstrend = stacknxt + blocksize; - stackp = sp; - INTON; - } - p = stacknxt; - stacknxt += aligned; - stacknleft -= aligned; - return p; -} - + struct stackmark smark; + int result; -void -stunalloc(pointer p) -{ -#if DEBUG - if (!p || (stacknxt < (char *)p) || ((char *)p < stackp->space)) { - write(2, "stunalloc\n", 10); - abort(); - } -#endif - stacknleft += stacknxt - (char *)p; - stacknxt = p; + setstackmark(&smark); + argbackq = pattern->narg.backquote; + STARTSTACKSTR(expdest); + ifslastp = NULL; + argstr(pattern->narg.text, EXP_TILDE | EXP_CASE); + STACKSTRNUL(expdest); + result = patmatch(stackblock(), val); + popstackmark(&smark); + return result; } -void -setstackmark(struct stackmark *mark) -{ - mark->stackp = stackp; - mark->stacknxt = stacknxt; - mark->stacknleft = stacknleft; - mark->marknext = markp; - markp = mark; -} +/* ============ find_command */ +struct builtincmd { + const char *name; + int (*builtin)(int, char **); + /* unsigned flags; */ +}; +#define IS_BUILTIN_SPECIAL(b) ((b)->name[0] & 1) +#define IS_BUILTIN_REGULAR(b) ((b)->name[0] & 2) +#define IS_BUILTIN_ASSIGN(b) ((b)->name[0] & 4) -void -popstackmark(struct stackmark *mark) -{ - struct stack_block *sp; +struct cmdentry { + int cmdtype; + union param { + int index; + const struct builtincmd *cmd; + struct funcnode *func; + } u; +}; +/* values of cmdtype */ +#define CMDUNKNOWN -1 /* no entry in table for command */ +#define CMDNORMAL 0 /* command is an executable program */ +#define CMDFUNCTION 1 /* command is a shell function */ +#define CMDBUILTIN 2 /* command is a shell builtin */ - INTOFF; - markp = mark->marknext; - while (stackp != mark->stackp) { - sp = stackp; - stackp = sp->prev; - ckfree(sp); - } - stacknxt = mark->stacknxt; - stacknleft = mark->stacknleft; - sstrend = mark->stacknxt + mark->stacknleft; - INTON; -} +/* action to find_command() */ +#define DO_ERR 0x01 /* prints errors */ +#define DO_ABS 0x02 /* checks absolute paths */ +#define DO_NOFUNC 0x04 /* don't return shell functions, for command */ +#define DO_ALTPATH 0x08 /* using alternate path */ +#define DO_ALTBLTIN 0x20 /* %builtin in alt. path */ + +static void find_command(char *, struct cmdentry *, int, const char *); +/* ============ Hashing commands */ + /* - * When the parser reads in a string, it wants to stick the string on the - * stack and only adjust the stack pointer when it knows how big the - * string is. Stackblock (defined in stack.h) returns a pointer to a block - * of space on top of the stack and stackblocklen returns the length of - * this block. Growstackblock will grow this space by at least one byte, - * possibly moving it (like realloc). Grabstackblock actually allocates the - * part of the block that has been used. + * When commands are first encountered, they are entered in a hash table. + * This ensures that a full path search will not have to be done for them + * on each invocation. + * + * We should investigate converting to a linear search, even though that + * would make the command name "hash" a misnomer. */ -void -growstackblock(void) -{ - size_t newlen; +#define CMDTABLESIZE 31 /* should be prime */ +#define ARB 1 /* actual size determined at run time */ - newlen = stacknleft * 2; - if (newlen < stacknleft) - sh_error(bb_msg_memory_exhausted); - if (newlen < 128) - newlen += 128; +struct tblentry { + struct tblentry *next; /* next entry in hash chain */ + union param param; /* definition of builtin function */ + short cmdtype; /* index identifying command */ + char rehash; /* if set, cd done since entry created */ + char cmdname[ARB]; /* name of command */ +}; - if (stacknxt == stackp->space && stackp != &stackbase) { - struct stack_block *oldstackp; - struct stackmark *xmark; - struct stack_block *sp; - struct stack_block *prevstackp; - size_t grosslen; +static struct tblentry *cmdtable[CMDTABLESIZE]; +static int builtinloc = -1; /* index in path of %builtin, or -1 */ - INTOFF; - oldstackp = stackp; - sp = stackp; - prevstackp = sp->prev; - grosslen = newlen + sizeof(struct stack_block) - MINSIZE; - sp = ckrealloc((pointer)sp, grosslen); - sp->prev = prevstackp; - stackp = sp; - stacknxt = sp->space; - stacknleft = newlen; - sstrend = sp->space + newlen; +static void +tryexec(char *cmd, char **argv, char **envp) +{ + int repeated = 0; - /* - * Stack marks pointing to the start of the old block - * must be relocated to point to the new block - */ - xmark = markp; - while (xmark != NULL && xmark->stackp == oldstackp) { - xmark->stackp = stackp; - xmark->stacknxt = stacknxt; - xmark->stacknleft = stacknleft; - xmark = xmark->marknext; - } - INTON; - } else { - char *oldspace = stacknxt; - int oldlen = stacknleft; - char *p = stalloc(newlen); +#if ENABLE_FEATURE_SH_STANDALONE + if (strchr(cmd, '/') == NULL) { + const struct bb_applet *a; - /* free the space we just allocated */ - stacknxt = memcpy(p, oldspace, oldlen); - stacknleft += newlen; + a = find_applet_by_name(cmd); + if (a) { + if (a->noexec) + run_appletstruct_and_exit(a, argv); + /* re-exec ourselves with the new arguments */ + execve(bb_busybox_exec_path, argv, envp); + /* If they called chroot or otherwise made the binary no longer + * executable, fall through */ + } } -} - -static void grabstackblock(size_t len) -{ - len = SHELL_ALIGN(len); - stacknxt += len; - stacknleft -= len; -} +#endif -/* - * The following routines are somewhat easier to use than the above. - * The user declares a variable of type STACKSTR, which may be declared - * to be a register. The macro STARTSTACKSTR initializes things. Then - * the user uses the macro STPUTC to add characters to the string. In - * effect, STPUTC(c, p) is the same as *p++ = c except that the stack is - * grown as necessary. When the user is done, she can just leave the - * string there and refer to it using stackblock(). Or she can allocate - * the space for it using grabstackstr(). If it is necessary to allow - * someone else to use the stack temporarily and then continue to grow - * the string, the user should use grabstack to allocate the space, and - * then call ungrabstr(p) to return to the previous mode of operation. - * - * USTPUTC is like STPUTC except that it doesn't check for overflow. - * CHECKSTACKSPACE can be called before USTPUTC to ensure that there - * is space for at least one character. - */ + repeat: +#ifdef SYSV + do { + execve(cmd, argv, envp); + } while (errno == EINTR); +#else + execve(cmd, argv, envp); +#endif + if (repeated++) { + free(argv); + } else if (errno == ENOEXEC) { + char **ap; + char **new; -void * -growstackstr(void) -{ - size_t len = stackblocksize(); - if (herefd >= 0 && len >= 1024) { - full_write(herefd, stackblock(), len); - return stackblock(); + for (ap = argv; *ap; ap++) + ; + ap = new = ckmalloc((ap - argv + 2) * sizeof(char *)); + ap[1] = cmd; + ap[0] = cmd = (char *)DEFAULT_SHELL; + ap += 2; + argv++; + while ((*ap++ = *argv++)) + ; + argv = new; + goto repeat; } - growstackblock(); - return stackblock() + len; } /* - * Called from CHECKSTRSPACE. + * Exec a program. Never returns. If you change this routine, you may + * have to change the find_command routine as well. */ - -char * -makestrspace(size_t newlen, char *p) +#define environment() listvars(VEXPORT, VUNSET, 0) +static void shellexec(char **, const char *, int) ATTRIBUTE_NORETURN; +static void +shellexec(char **argv, const char *path, int idx) { - size_t len = p - stacknxt; - size_t size = stackblocksize(); + char *cmdname; + int e; + char **envp; + int exerrno; - for (;;) { - size_t nleft; + clearredir(1); + envp = environment(); + if (strchr(argv[0], '/') +#if ENABLE_FEATURE_SH_STANDALONE + || find_applet_by_name(argv[0]) +#endif + ) { + tryexec(argv[0], argv, envp); + e = errno; + } else { + e = ENOENT; + while ((cmdname = padvance(&path, argv[0])) != NULL) { + if (--idx < 0 && pathopt == NULL) { + tryexec(cmdname, argv, envp); + if (errno != ENOENT && errno != ENOTDIR) + e = errno; + } + stunalloc(cmdname); + } + } - size = stackblocksize(); - nleft = size - len; - if (nleft >= newlen) - break; - growstackblock(); + /* Map to POSIX errors */ + switch (e) { + case EACCES: + exerrno = 126; + break; + case ENOENT: + exerrno = 127; + break; + default: + exerrno = 2; + break; } - return stackblock() + len; + exitstatus = exerrno; + TRACE(("shellexec failed for %s, errno %d, suppressint %d\n", + argv[0], e, suppressint )); + ash_msg_and_raise(EXEXEC, "%s: %s", argv[0], errmsg(e, "not found")); + /* NOTREACHED */ } -char * -stnputs(const char *s, size_t n, char *p) +static void +printentry(struct tblentry *cmdp) { - p = makestrspace(n, p); - p = memcpy(p, s, n) + n; - return p; + int idx; + const char *path; + char *name; + + idx = cmdp->param.index; + path = pathval(); + do { + name = padvance(&path, cmdp->cmdname); + stunalloc(name); + } while (--idx >= 0); + out1fmt("%s%s\n", name, (cmdp->rehash ? "*" : nullstr)); } -char * -stputs(const char *s, char *p) +/* + * Clear out command entries. The argument specifies the first entry in + * PATH which has changed. + */ +static void +clearcmdentry(int firstchange) { - return stnputs(s, strlen(s), p); + struct tblentry **tblp; + struct tblentry **pp; + struct tblentry *cmdp; + + INT_OFF; + for (tblp = cmdtable; tblp < &cmdtable[CMDTABLESIZE]; tblp++) { + pp = tblp; + while ((cmdp = *pp) != NULL) { + if ((cmdp->cmdtype == CMDNORMAL && + cmdp->param.index >= firstchange) + || (cmdp->cmdtype == CMDBUILTIN && + builtinloc >= firstchange) + ) { + *pp = cmdp->next; + free(cmdp); + } else { + pp = &cmdp->next; + } + } + } + INT_ON; } -/* mystring.c */ - /* - * String functions. + * Locate a command in the command hash table. If "add" is nonzero, + * add the command to the table if it is not already present. The + * variable "lastcmdentry" is set to point to the address of the link + * pointing to the entry, so that delete_cmd_entry can delete the + * entry. * - * number(s) Convert a string of digits to an integer. - * is_number(s) Return true if s is a string of digits. - */ - -/* - * prefix -- see if pfx is a prefix of string. + * Interrupts must be off if called with add != 0. */ +static struct tblentry **lastcmdentry; -char * -prefix(const char *string, const char *pfx) +static struct tblentry * +cmdlookup(const char *name, int add) { - while (*pfx) { - if (*pfx++ != *string++) - return 0; + unsigned int hashval; + const char *p; + struct tblentry *cmdp; + struct tblentry **pp; + + p = name; + hashval = (unsigned char)*p << 4; + while (*p) + hashval += (unsigned char)*p++; + hashval &= 0x7FFF; + pp = &cmdtable[hashval % CMDTABLESIZE]; + for (cmdp = *pp; cmdp; cmdp = cmdp->next) { + if (strcmp(cmdp->cmdname, name) == 0) + break; + pp = &cmdp->next; } - return (char *) string; + if (add && cmdp == NULL) { + cmdp = *pp = ckmalloc(sizeof(struct tblentry) - ARB + + strlen(name) + 1); + cmdp->next = NULL; + cmdp->cmdtype = CMDUNKNOWN; + strcpy(cmdp->cmdname, name); + } + lastcmdentry = pp; + return cmdp; } - /* - * Convert a string of digits to an integer, printing an error message on - * failure. + * Delete the command entry returned on the last lookup. */ - -int -number(const char *s) +static void +delete_cmd_entry(void) { + struct tblentry *cmdp; - if (! is_number(s)) - sh_error(illnum, s); - return atoi(s); + INT_OFF; + cmdp = *lastcmdentry; + *lastcmdentry = cmdp->next; + if (cmdp->cmdtype == CMDFUNCTION) + freefunc(cmdp->param.func); + free(cmdp); + INT_ON; } - /* - * Check for a valid number. This should be elsewhere. + * Add a new command entry, replacing any existing command entry for + * the same name - except special builtins. */ - -int -is_number(const char *p) +static void +addcmdentry(char *name, struct cmdentry *entry) { - do { - if (! is_digit(*p)) - return 0; - } while (*++p != '\0'); - return 1; -} - - -/* - * Produce a possibly single quoted string suitable as input to the shell. - * The return string is allocated on the stack. - */ - -char * -single_quote(const char *s) { - char *p; - - STARTSTACKSTR(p); - - do { - char *q; - size_t len; - - len = strchrnul(s, '\'') - s; - - q = p = makestrspace(len + 3, p); - - *q++ = '\''; - q = memcpy(q, s, len) + len; - *q++ = '\''; - s += len; - - STADJUST(q - p, p); - - len = strspn(s, "'"); - if (!len) - break; - - q = p = makestrspace(len + 3, p); - - *q++ = '"'; - q = memcpy(q, s, len) + len; - *q++ = '"'; - s += len; + struct tblentry *cmdp; - STADJUST(q - p, p); - } while (*s); + cmdp = cmdlookup(name, 1); + if (cmdp->cmdtype == CMDFUNCTION) { + freefunc(cmdp->param.func); + } + cmdp->cmdtype = entry->cmdtype; + cmdp->param = entry->u; + cmdp->rehash = 0; +} - USTPUTC(0, p); +static int +hashcmd(int argc, char **argv) +{ + struct tblentry **pp; + struct tblentry *cmdp; + int c; + struct cmdentry entry; + char *name; - return stackblock(); + while ((c = nextopt("r")) != '\0') { + clearcmdentry(0); + return 0; + } + if (*argptr == NULL) { + for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) { + for (cmdp = *pp; cmdp; cmdp = cmdp->next) { + if (cmdp->cmdtype == CMDNORMAL) + printentry(cmdp); + } + } + return 0; + } + c = 0; + while ((name = *argptr) != NULL) { + cmdp = cmdlookup(name, 0); + if (cmdp != NULL + && (cmdp->cmdtype == CMDNORMAL + || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))) + delete_cmd_entry(); + find_command(name, &entry, DO_ERR, pathval()); + if (entry.cmdtype == CMDUNKNOWN) + c = 1; + argptr++; + } + return c; } /* - * Like strdup but works with the ash stack. + * Called when a cd is done. Marks all commands so the next time they + * are executed they will be rehashed. */ - -char * -sstrdup(const char *p) -{ - size_t len = strlen(p) + 1; - return memcpy(stalloc(len), p, len); -} - - static void -calcsize(union node *n) +hashcd(void) { - if (n == NULL) - return; - funcblocksize += nodesize[n->type]; - switch (n->type) { - case NCMD: - calcsize(n->ncmd.redirect); - calcsize(n->ncmd.args); - calcsize(n->ncmd.assign); - break; - case NPIPE: - sizenodelist(n->npipe.cmdlist); - break; - case NREDIR: - case NBACKGND: - case NSUBSHELL: - calcsize(n->nredir.redirect); - calcsize(n->nredir.n); - break; - case NAND: - case NOR: - case NSEMI: - case NWHILE: - case NUNTIL: - calcsize(n->nbinary.ch2); - calcsize(n->nbinary.ch1); - break; - case NIF: - calcsize(n->nif.elsepart); - calcsize(n->nif.ifpart); - calcsize(n->nif.test); - break; - case NFOR: - funcstringsize += strlen(n->nfor.var) + 1; - calcsize(n->nfor.body); - calcsize(n->nfor.args); - break; - case NCASE: - calcsize(n->ncase.cases); - calcsize(n->ncase.expr); - break; - case NCLIST: - calcsize(n->nclist.body); - calcsize(n->nclist.pattern); - calcsize(n->nclist.next); - break; - case NDEFUN: - case NARG: - sizenodelist(n->narg.backquote); - funcstringsize += strlen(n->narg.text) + 1; - calcsize(n->narg.next); - break; - case NTO: - case NCLOBBER: - case NFROM: - case NFROMTO: - case NAPPEND: - calcsize(n->nfile.fname); - calcsize(n->nfile.next); - break; - case NTOFD: - case NFROMFD: - calcsize(n->ndup.vname); - calcsize(n->ndup.next); - break; - case NHERE: - case NXHERE: - calcsize(n->nhere.doc); - calcsize(n->nhere.next); - break; - case NNOT: - calcsize(n->nnot.com); - break; - }; -} + struct tblentry **pp; + struct tblentry *cmdp; + for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) { + for (cmdp = *pp; cmdp; cmdp = cmdp->next) { + if (cmdp->cmdtype == CMDNORMAL || ( + cmdp->cmdtype == CMDBUILTIN && + !(IS_BUILTIN_REGULAR(cmdp->param.cmd)) && + builtinloc > 0 + )) + cmdp->rehash = 1; + } + } +} +/* + * Fix command hash table when PATH changed. + * Called before PATH is changed. The argument is the new value of PATH; + * pathval() still returns the old value at this point. + * Called with interrupts off. + */ static void -sizenodelist(struct nodelist *lp) +changepath(const char *newval) { - while (lp) { - funcblocksize += SHELL_ALIGN(sizeof(struct nodelist)); - calcsize(lp->n); - lp = lp->next; + const char *old, *new; + int idx; + int firstchange; + int idx_bltin; + + old = pathval(); + new = newval; + firstchange = 9999; /* assume no change */ + idx = 0; + idx_bltin = -1; + for (;;) { + if (*old != *new) { + firstchange = idx; + if ((*old == '\0' && *new == ':') + || (*old == ':' && *new == '\0')) + firstchange++; + old = new; /* ignore subsequent differences */ + } + if (*new == '\0') + break; + if (*new == '%' && idx_bltin < 0 && prefix(new + 1, "builtin")) + idx_bltin = idx; + if (*new == ':') { + idx++; + } + new++, old++; } + if (builtinloc < 0 && idx_bltin >= 0) + builtinloc = idx_bltin; /* zap builtins */ + if (builtinloc >= 0 && idx_bltin < 0) + firstchange = 0; + clearcmdentry(firstchange); + builtinloc = idx_bltin; } +#define TEOF 0 +#define TNL 1 +#define TREDIR 2 +#define TWORD 3 +#define TSEMI 4 +#define TBACKGND 5 +#define TAND 6 +#define TOR 7 +#define TPIPE 8 +#define TLP 9 +#define TRP 10 +#define TENDCASE 11 +#define TENDBQUOTE 12 +#define TNOT 13 +#define TCASE 14 +#define TDO 15 +#define TDONE 16 +#define TELIF 17 +#define TELSE 18 +#define TESAC 19 +#define TFI 20 +#define TFOR 21 +#define TIF 22 +#define TIN 23 +#define TTHEN 24 +#define TUNTIL 25 +#define TWHILE 26 +#define TBEGIN 27 +#define TEND 28 -static union node * -copynode(union node *n) -{ - union node *new; - - if (n == NULL) - return NULL; - new = funcblock; - funcblock = (char *) funcblock + nodesize[n->type]; - switch (n->type) { - case NCMD: - new->ncmd.redirect = copynode(n->ncmd.redirect); - new->ncmd.args = copynode(n->ncmd.args); - new->ncmd.assign = copynode(n->ncmd.assign); - break; - case NPIPE: - new->npipe.cmdlist = copynodelist(n->npipe.cmdlist); - new->npipe.backgnd = n->npipe.backgnd; - break; - case NREDIR: - case NBACKGND: - case NSUBSHELL: - new->nredir.redirect = copynode(n->nredir.redirect); - new->nredir.n = copynode(n->nredir.n); - break; - case NAND: - case NOR: - case NSEMI: - case NWHILE: - case NUNTIL: - new->nbinary.ch2 = copynode(n->nbinary.ch2); - new->nbinary.ch1 = copynode(n->nbinary.ch1); - break; - case NIF: - new->nif.elsepart = copynode(n->nif.elsepart); - new->nif.ifpart = copynode(n->nif.ifpart); - new->nif.test = copynode(n->nif.test); - break; - case NFOR: - new->nfor.var = nodesavestr(n->nfor.var); - new->nfor.body = copynode(n->nfor.body); - new->nfor.args = copynode(n->nfor.args); - break; - case NCASE: - new->ncase.cases = copynode(n->ncase.cases); - new->ncase.expr = copynode(n->ncase.expr); - break; - case NCLIST: - new->nclist.body = copynode(n->nclist.body); - new->nclist.pattern = copynode(n->nclist.pattern); - new->nclist.next = copynode(n->nclist.next); - break; - case NDEFUN: - case NARG: - new->narg.backquote = copynodelist(n->narg.backquote); - new->narg.text = nodesavestr(n->narg.text); - new->narg.next = copynode(n->narg.next); - break; - case NTO: - case NCLOBBER: - case NFROM: - case NFROMTO: - case NAPPEND: - new->nfile.fname = copynode(n->nfile.fname); - new->nfile.fd = n->nfile.fd; - new->nfile.next = copynode(n->nfile.next); - break; - case NTOFD: - case NFROMFD: - new->ndup.vname = copynode(n->ndup.vname); - new->ndup.dupfd = n->ndup.dupfd; - new->ndup.fd = n->ndup.fd; - new->ndup.next = copynode(n->ndup.next); - break; - case NHERE: - case NXHERE: - new->nhere.doc = copynode(n->nhere.doc); - new->nhere.fd = n->nhere.fd; - new->nhere.next = copynode(n->nhere.next); - break; - case NNOT: - new->nnot.com = copynode(n->nnot.com); - break; - }; - new->type = n->type; - return new; -} - +/* first char is indicating which tokens mark the end of a list */ +static const char *const tokname_array[] = { + "\1end of file", + "\0newline", + "\0redirection", + "\0word", + "\0;", + "\0&", + "\0&&", + "\0||", + "\0|", + "\0(", + "\1)", + "\1;;", + "\1`", +#define KWDOFFSET 13 + /* the following are keywords */ + "\0!", + "\0case", + "\1do", + "\1done", + "\1elif", + "\1else", + "\1esac", + "\1fi", + "\0for", + "\0if", + "\0in", + "\1then", + "\0until", + "\0while", + "\0{", + "\1}", +}; -static struct nodelist * -copynodelist(struct nodelist *lp) +static const char * +tokname(int tok) { - struct nodelist *start; - struct nodelist **lpp; + static char buf[16]; - lpp = &start; - while (lp) { - *lpp = funcblock; - funcblock = (char *) funcblock + - SHELL_ALIGN(sizeof(struct nodelist)); - (*lpp)->n = copynode(lp->n); - lp = lp->next; - lpp = &(*lpp)->next; - } - *lpp = NULL; - return start; -} +//try this: +//if (tok < TSEMI) return tokname_array[tok] + 1; +//sprintf(buf, "\"%s\"", tokname_array[tok] + 1); +//return buf; + if (tok >= TSEMI) + buf[0] = '"'; + sprintf(buf + (tok >= TSEMI), "%s%c", + tokname_array[tok] + 1, (tok >= TSEMI ? '"' : 0)); + return buf; +} -static char * -nodesavestr(char *s) +/* Wrapper around strcmp for qsort/bsearch/... */ +static int +pstrcmp(const void *a, const void *b) { - char *rtn = funcstring; - - strcpy(funcstring, s); - funcstring += strlen(s) + 1; - return rtn; + return strcmp((char*) a, (*(char**) b) + 1); } - -/* - * Free a parse tree. - */ - -static void -freefunc(struct funcnode *f) +static const char *const * +findkwd(const char *s) { - if (f && --f->count < 0) - ckfree(f); + return bsearch(s, tokname_array + KWDOFFSET, + ARRAY_SIZE(tokname_array) - KWDOFFSET, + sizeof(tokname_array[0]), pstrcmp); } - -static void options(int); -static void setoption(int, int); - - /* - * Process the shell command line arguments. + * Locate and print what a word is... */ - -void -procargs(int argc, char **argv) +static int +describe_command(char *command, int describe_command_verbose) { - int i; - const char *xminusc; - char **xargv; - - xargv = argv; - arg0 = xargv[0]; - if (argc > 0) - xargv++; - for (i = 0; i < NOPTS; i++) - optlist[i] = 2; - argptr = xargv; - options(1); - xargv = argptr; - xminusc = minusc; - if (*xargv == NULL) { - if (xminusc) - sh_error(bb_msg_requires_arg, "-c"); - sflag = 1; - } - if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1)) - iflag = 1; - if (mflag == 2) - mflag = iflag; - for (i = 0; i < NOPTS; i++) - if (optlist[i] == 2) - optlist[i] = 0; -#if DEBUG == 2 - debug = 1; + struct cmdentry entry; + struct tblentry *cmdp; +#if ENABLE_ASH_ALIAS + const struct alias *ap; #endif - /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */ - if (xminusc) { - minusc = *xargv++; - if (*xargv) - goto setarg0; - } else if (!sflag) { - setinputfile(*xargv, 0); -setarg0: - arg0 = *xargv++; - commandname = arg0; - } + const char *path = pathval(); - shellparam.p = xargv; -#ifdef CONFIG_ASH_GETOPTS - shellparam.optind = 1; - shellparam.optoff = -1; -#endif - /* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */ - while (*xargv) { - shellparam.nparam++; - xargv++; + if (describe_command_verbose) { + out1str(command); } - optschanged(); -} + /* First look at the keywords */ + if (findkwd(command)) { + out1str(describe_command_verbose ? " is a shell keyword" : command); + goto out; + } -void -optschanged(void) -{ -#if DEBUG - opentrace(); +#if ENABLE_ASH_ALIAS + /* Then look at the aliases */ + ap = lookupalias(command, 0); + if (ap != NULL) { + if (!describe_command_verbose) { + out1str("alias "); + printalias(ap); + return 0; + } + out1fmt(" is an alias for %s", ap->val); + goto out; + } #endif - setinteractive(iflag); - setjobctl(mflag); - setvimode(viflag); -} - -static void minus_o(char *name, int val) -{ - int i; - - if (name == NULL) { - out1str("Current option settings\n"); - for (i = 0; i < NOPTS; i++) - out1fmt("%-16s%s\n", optnames(i), - optlist[i] ? "on" : "off"); + /* Then check if it is a tracked alias */ + cmdp = cmdlookup(command, 0); + if (cmdp != NULL) { + entry.cmdtype = cmdp->cmdtype; + entry.u = cmdp->param; } else { - for (i = 0; i < NOPTS; i++) - if (equal(name, optnames(i))) { - optlist[i] = val; - return; - } - sh_error("Illegal option -o %s", name); + /* Finally use brute force */ + find_command(command, &entry, DO_ABS, path); } -} - -/* - * Process shell options. The global variable argptr contains a pointer - * to the argument list; we advance it past the options. - */ - -static void -options(int cmdline) -{ - char *p; - int val; - int c; - if (cmdline) - minusc = NULL; - while ((p = *argptr) != NULL) { - argptr++; - if ((c = *p++) == '-') { - val = 1; - if (p[0] == '\0' || LONE_DASH(p)) { - if (!cmdline) { - /* "-" means turn off -x and -v */ - if (p[0] == '\0') - xflag = vflag = 0; - /* "--" means reset params */ - else if (*argptr == NULL) - setparam(argptr); - } - break; /* "-" or "--" terminates options */ - } - } else if (c == '+') { - val = 0; + switch (entry.cmdtype) { + case CMDNORMAL: { + int j = entry.u.index; + char *p; + if (j == -1) { + p = command; } else { - argptr--; - break; + do { + p = padvance(&path, command); + stunalloc(p); + } while (--j >= 0); } - while ((c = *p++) != '\0') { - if (c == 'c' && cmdline) { - minusc = p; /* command is after shell args*/ - } else if (c == 'o') { - minus_o(*argptr, val); - if (*argptr) - argptr++; - } else if (cmdline && (c == '-')) { // long options - if (strcmp(p, "login") == 0) - isloginsh = 1; - break; - } else { - setoption(c, val); - } + if (describe_command_verbose) { + out1fmt(" is%s %s", + (cmdp ? " a tracked alias for" : nullstr), p + ); + } else { + out1str(p); } + break; } -} - - -static void -setoption(int flag, int val) -{ - int i; - - for (i = 0; i < NOPTS; i++) - if (optletters(i) == flag) { - optlist[i] = val; - return; - } - sh_error("Illegal option -%c", flag); - /* NOTREACHED */ -} - - - -/* - * Set the shell parameters. - */ -void -setparam(char **argv) -{ - char **newparam; - char **ap; - int nparam; + case CMDFUNCTION: + if (describe_command_verbose) { + out1str(" is a shell function"); + } else { + out1str(command); + } + break; - for (nparam = 0 ; argv[nparam] ; nparam++); - ap = newparam = ckmalloc((nparam + 1) * sizeof *ap); - while (*argv) { - *ap++ = savestr(*argv++); + case CMDBUILTIN: + if (describe_command_verbose) { + out1fmt(" is a %sshell builtin", + IS_BUILTIN_SPECIAL(entry.u.cmd) ? + "special " : nullstr + ); + } else { + out1str(command); + } + break; + + default: + if (describe_command_verbose) { + out1str(": not found\n"); + } + return 127; } - *ap = NULL; - freeparam(&shellparam); - shellparam.malloc = 1; - shellparam.nparam = nparam; - shellparam.p = newparam; -#ifdef CONFIG_ASH_GETOPTS - shellparam.optind = 1; - shellparam.optoff = -1; -#endif + out: + outstr("\n", stdout); + return 0; } - -/* - * Free the list of positional parameters. - */ - -void -freeparam(volatile struct shparam *param) +static int +typecmd(int argc, char **argv) { - char **ap; + int i = 1; + int err = 0; + int verbose = 1; - if (param->malloc) { - for (ap = param->p ; *ap ; ap++) - ckfree(*ap); - ckfree(param->p); + /* type -p ... ? (we don't bother checking for 'p') */ + if (argv[1] && argv[1][0] == '-') { + i++; + verbose = 0; + } + while (i < argc) { + err |= describe_command(argv[i++], verbose); } + return err; } - - -/* - * The shift builtin command. - */ - -int -shiftcmd(int argc, char **argv) +#if ENABLE_ASH_CMDCMD +static int +commandcmd(int argc, char **argv) { - int n; - char **ap1, **ap2; + int c; + enum { + VERIFY_BRIEF = 1, + VERIFY_VERBOSE = 2, + } verify = 0; - n = 1; - if (argc > 1) - n = number(argv[1]); - if (n > shellparam.nparam) - sh_error("can't shift that many"); - INTOFF; - shellparam.nparam -= n; - for (ap1 = shellparam.p ; --n >= 0 ; ap1++) { - if (shellparam.malloc) - ckfree(*ap1); - } - ap2 = shellparam.p; - while ((*ap2++ = *ap1++) != NULL); -#ifdef CONFIG_ASH_GETOPTS - shellparam.optind = 1; - shellparam.optoff = -1; + while ((c = nextopt("pvV")) != '\0') + if (c == 'V') + verify |= VERIFY_VERBOSE; + else if (c == 'v') + verify |= VERIFY_BRIEF; +#if DEBUG + else if (c != 'p') + abort(); #endif - INTON; + if (verify) + return describe_command(*argptr, verify - VERIFY_BRIEF); + return 0; } +#endif +/* ============ eval.c */ -/* - * The set command builtin. - */ +static int funcblocksize; /* size of structures in function */ +static int funcstringsize; /* size of strings in node */ +static void *funcblock; /* block to allocate function from */ +static char *funcstring; /* block to allocate strings from */ -int -setcmd(int argc, char **argv) -{ - if (argc == 1) - return showvars(nullstr, 0, VUNSET); - INTOFF; - options(0); - optschanged(); - if (*argptr != NULL) { - setparam(argptr); - } - INTON; - return 0; -} +/* flags in argument to evaltree */ +#define EV_EXIT 01 /* exit after evaluating tree */ +#define EV_TESTED 02 /* exit status is checked; ignore -e flag */ +#define EV_BACKCMD 04 /* command executing within back quotes */ +static const short nodesize[26] = { + SHELL_ALIGN(sizeof(struct ncmd)), + SHELL_ALIGN(sizeof(struct npipe)), + SHELL_ALIGN(sizeof(struct nredir)), + SHELL_ALIGN(sizeof(struct nredir)), + SHELL_ALIGN(sizeof(struct nredir)), + SHELL_ALIGN(sizeof(struct nbinary)), + SHELL_ALIGN(sizeof(struct nbinary)), + SHELL_ALIGN(sizeof(struct nbinary)), + SHELL_ALIGN(sizeof(struct nif)), + SHELL_ALIGN(sizeof(struct nbinary)), + SHELL_ALIGN(sizeof(struct nbinary)), + SHELL_ALIGN(sizeof(struct nfor)), + SHELL_ALIGN(sizeof(struct ncase)), + SHELL_ALIGN(sizeof(struct nclist)), + SHELL_ALIGN(sizeof(struct narg)), + SHELL_ALIGN(sizeof(struct narg)), + SHELL_ALIGN(sizeof(struct nfile)), + SHELL_ALIGN(sizeof(struct nfile)), + SHELL_ALIGN(sizeof(struct nfile)), + SHELL_ALIGN(sizeof(struct nfile)), + SHELL_ALIGN(sizeof(struct nfile)), + SHELL_ALIGN(sizeof(struct ndup)), + SHELL_ALIGN(sizeof(struct ndup)), + SHELL_ALIGN(sizeof(struct nhere)), + SHELL_ALIGN(sizeof(struct nhere)), + SHELL_ALIGN(sizeof(struct nnot)), +}; + +static void calcsize(union node *n); -#ifdef CONFIG_ASH_GETOPTS static void -getoptsreset(const char *value) +sizenodelist(struct nodelist *lp) { - shellparam.optind = number(value); - shellparam.optoff = -1; + while (lp) { + funcblocksize += SHELL_ALIGN(sizeof(struct nodelist)); + calcsize(lp->n); + lp = lp->next; + } } -#endif -#ifdef CONFIG_LOCALE_SUPPORT -static void change_lc_all(const char *value) +static void +calcsize(union node *n) { - if (value != 0 && *value != 0) - setlocale(LC_ALL, value); + if (n == NULL) + return; + funcblocksize += nodesize[n->type]; + switch (n->type) { + case NCMD: + calcsize(n->ncmd.redirect); + calcsize(n->ncmd.args); + calcsize(n->ncmd.assign); + break; + case NPIPE: + sizenodelist(n->npipe.cmdlist); + break; + case NREDIR: + case NBACKGND: + case NSUBSHELL: + calcsize(n->nredir.redirect); + calcsize(n->nredir.n); + break; + case NAND: + case NOR: + case NSEMI: + case NWHILE: + case NUNTIL: + calcsize(n->nbinary.ch2); + calcsize(n->nbinary.ch1); + break; + case NIF: + calcsize(n->nif.elsepart); + calcsize(n->nif.ifpart); + calcsize(n->nif.test); + break; + case NFOR: + funcstringsize += strlen(n->nfor.var) + 1; + calcsize(n->nfor.body); + calcsize(n->nfor.args); + break; + case NCASE: + calcsize(n->ncase.cases); + calcsize(n->ncase.expr); + break; + case NCLIST: + calcsize(n->nclist.body); + calcsize(n->nclist.pattern); + calcsize(n->nclist.next); + break; + case NDEFUN: + case NARG: + sizenodelist(n->narg.backquote); + funcstringsize += strlen(n->narg.text) + 1; + calcsize(n->narg.next); + break; + case NTO: + case NCLOBBER: + case NFROM: + case NFROMTO: + case NAPPEND: + calcsize(n->nfile.fname); + calcsize(n->nfile.next); + break; + case NTOFD: + case NFROMFD: + calcsize(n->ndup.vname); + calcsize(n->ndup.next); + break; + case NHERE: + case NXHERE: + calcsize(n->nhere.doc); + calcsize(n->nhere.next); + break; + case NNOT: + calcsize(n->nnot.com); + break; + }; } -static void change_lc_ctype(const char *value) +static char * +nodeckstrdup(char *s) { - if (value != 0 && *value != 0) - setlocale(LC_CTYPE, value); + char *rtn = funcstring; + + strcpy(funcstring, s); + funcstring += strlen(s) + 1; + return rtn; } -#endif +static union node *copynode(union node *); -#ifdef CONFIG_ASH_RANDOM_SUPPORT -/* Roughly copied from bash.. */ -static void change_random(const char *value) +static struct nodelist * +copynodelist(struct nodelist *lp) { - if(value == NULL) { - /* "get", generate */ - char buf[16]; + struct nodelist *start; + struct nodelist **lpp; - rseed = rseed * 1103515245 + 12345; - sprintf(buf, "%d", (unsigned int)((rseed & 32767))); - /* set without recursion */ - setvar(vrandom.text, buf, VNOFUNC); - vrandom.flags &= ~VNOFUNC; - } else { - /* set/reset */ - rseed = strtoul(value, (char **)NULL, 10); + lpp = &start; + while (lp) { + *lpp = funcblock; + funcblock = (char *) funcblock + SHELL_ALIGN(sizeof(struct nodelist)); + (*lpp)->n = copynode(lp->n); + lp = lp->next; + lpp = &(*lpp)->next; } + *lpp = NULL; + return start; } -#endif - -#ifdef CONFIG_ASH_GETOPTS -static int -getopts(char *optstr, char *optvar, char **optfirst, int *param_optind, int *optoff) +static union node * +copynode(union node *n) { - char *p, *q; - char c = '?'; - int done = 0; - int err = 0; - char s[12]; - char **optnext; + union node *new; - if(*param_optind < 1) - return 1; - optnext = optfirst + *param_optind - 1; + if (n == NULL) + return NULL; + new = funcblock; + funcblock = (char *) funcblock + nodesize[n->type]; - if (*param_optind <= 1 || *optoff < 0 || strlen(optnext[-1]) < *optoff) - p = NULL; - else - p = optnext[-1] + *optoff; - if (p == NULL || *p == '\0') { - /* Current word is done, advance */ - p = *optnext; - if (p == NULL || *p != '-' || *++p == '\0') { -atend: - p = NULL; - done = 1; - goto out; - } - optnext++; - if (LONE_DASH(p)) /* check for "--" */ - goto atend; - } + switch (n->type) { + case NCMD: + new->ncmd.redirect = copynode(n->ncmd.redirect); + new->ncmd.args = copynode(n->ncmd.args); + new->ncmd.assign = copynode(n->ncmd.assign); + break; + case NPIPE: + new->npipe.cmdlist = copynodelist(n->npipe.cmdlist); + new->npipe.backgnd = n->npipe.backgnd; + break; + case NREDIR: + case NBACKGND: + case NSUBSHELL: + new->nredir.redirect = copynode(n->nredir.redirect); + new->nredir.n = copynode(n->nredir.n); + break; + case NAND: + case NOR: + case NSEMI: + case NWHILE: + case NUNTIL: + new->nbinary.ch2 = copynode(n->nbinary.ch2); + new->nbinary.ch1 = copynode(n->nbinary.ch1); + break; + case NIF: + new->nif.elsepart = copynode(n->nif.elsepart); + new->nif.ifpart = copynode(n->nif.ifpart); + new->nif.test = copynode(n->nif.test); + break; + case NFOR: + new->nfor.var = nodeckstrdup(n->nfor.var); + new->nfor.body = copynode(n->nfor.body); + new->nfor.args = copynode(n->nfor.args); + break; + case NCASE: + new->ncase.cases = copynode(n->ncase.cases); + new->ncase.expr = copynode(n->ncase.expr); + break; + case NCLIST: + new->nclist.body = copynode(n->nclist.body); + new->nclist.pattern = copynode(n->nclist.pattern); + new->nclist.next = copynode(n->nclist.next); + break; + case NDEFUN: + case NARG: + new->narg.backquote = copynodelist(n->narg.backquote); + new->narg.text = nodeckstrdup(n->narg.text); + new->narg.next = copynode(n->narg.next); + break; + case NTO: + case NCLOBBER: + case NFROM: + case NFROMTO: + case NAPPEND: + new->nfile.fname = copynode(n->nfile.fname); + new->nfile.fd = n->nfile.fd; + new->nfile.next = copynode(n->nfile.next); + break; + case NTOFD: + case NFROMFD: + new->ndup.vname = copynode(n->ndup.vname); + new->ndup.dupfd = n->ndup.dupfd; + new->ndup.fd = n->ndup.fd; + new->ndup.next = copynode(n->ndup.next); + break; + case NHERE: + case NXHERE: + new->nhere.doc = copynode(n->nhere.doc); + new->nhere.fd = n->nhere.fd; + new->nhere.next = copynode(n->nhere.next); + break; + case NNOT: + new->nnot.com = copynode(n->nnot.com); + break; + }; + new->type = n->type; + return new; +} - c = *p++; - for (q = optstr; *q != c; ) { - if (*q == '\0') { - if (optstr[0] == ':') { - s[0] = c; - s[1] = '\0'; - err |= setvarsafe("OPTARG", s, 0); - } else { - fprintf(stderr, "Illegal option -%c\n", c); - (void) unsetvar("OPTARG"); - } - c = '?'; - goto out; - } - if (*++q == ':') - q++; - } +/* + * Make a copy of a parse tree. + */ +static struct funcnode * +copyfunc(union node *n) +{ + struct funcnode *f; + size_t blocksize; - if (*++q == ':') { - if (*p == '\0' && (p = *optnext) == NULL) { - if (optstr[0] == ':') { - s[0] = c; - s[1] = '\0'; - err |= setvarsafe("OPTARG", s, 0); - c = ':'; - } else { - fprintf(stderr, "No arg for -%c option\n", c); - (void) unsetvar("OPTARG"); - c = '?'; - } - goto out; - } + funcblocksize = offsetof(struct funcnode, n); + funcstringsize = 0; + calcsize(n); + blocksize = funcblocksize; + f = ckmalloc(blocksize + funcstringsize); + funcblock = (char *) f + offsetof(struct funcnode, n); + funcstring = (char *) f + blocksize; + copynode(n); + f->count = 0; + return f; +} - if (p == *optnext) - optnext++; - err |= setvarsafe("OPTARG", p, 0); - p = NULL; - } else - err |= setvarsafe("OPTARG", nullstr, 0); +/* + * Define a shell function. + */ +static void +defun(char *name, union node *func) +{ + struct cmdentry entry; -out: - *optoff = p ? p - *(optnext - 1) : -1; - *param_optind = optnext - optfirst + 1; - fmtstr(s, sizeof(s), "%d", *param_optind); - err |= setvarsafe("OPTIND", s, VNOFUNC); - s[0] = c; - s[1] = '\0'; - err |= setvarsafe(optvar, s, 0); - if (err) { - *param_optind = 1; - *optoff = -1; - flushall(); - exraise(EXERROR); - } - return done; + INT_OFF; + entry.cmdtype = CMDFUNCTION; + entry.u.func = copyfunc(func); + addcmdentry(name, &entry); + INT_ON; } +static int evalskip; /* set if we are skipping commands */ +/* reasons for skipping commands (see comment on breakcmd routine) */ +#define SKIPBREAK (1 << 0) +#define SKIPCONT (1 << 1) +#define SKIPFUNC (1 << 2) +#define SKIPFILE (1 << 3) +#define SKIPEVAL (1 << 4) +static int skipcount; /* number of levels to skip */ +static int funcnest; /* depth of function calls */ + +/* forward decl way out to parsing code - dotrap needs it */ +static int evalstring(char *s, int mask); + /* - * The getopts builtin. Shellparam.optnext points to the next argument - * to be processed. Shellparam.optptr points to the next character to - * be processed in the current argument. If shellparam.optnext is NULL, - * then it's the first time getopts has been called. + * Called to execute a trap. Perhaps we should avoid entering new trap + * handlers while we are executing a trap handler. */ - -int -getoptscmd(int argc, char **argv) +static int +dotrap(void) { - char **optbase; + char *p; + char *q; + int i; + int savestatus; + int skip = 0; - if (argc < 3) - sh_error("Usage: getopts optstring var [arg]"); - else if (argc == 3) { - optbase = shellparam.p; - if (shellparam.optind > shellparam.nparam + 1) { - shellparam.optind = 1; - shellparam.optoff = -1; - } - } - else { - optbase = &argv[3]; - if (shellparam.optind > argc - 2) { - shellparam.optind = 1; - shellparam.optoff = -1; - } + savestatus = exitstatus; + pendingsig = 0; + xbarrier(); + + for (i = 0, q = gotsig; i < NSIG - 1; i++, q++) { + if (!*q) + continue; + *q = '\0'; + + p = trap[i + 1]; + if (!p) + continue; + skip = evalstring(p, SKIPEVAL); + exitstatus = savestatus; + if (skip) + break; } - return getopts(argv[1], argv[2], optbase, &shellparam.optind, - &shellparam.optoff); + return skip; } -#endif /* CONFIG_ASH_GETOPTS */ + +/* forward declarations - evaluation is fairly recursive business... */ +static void evalloop(union node *, int); +static void evalfor(union node *, int); +static void evalcase(union node *, int); +static void evalsubshell(union node *, int); +static void expredir(union node *); +static void evalpipe(union node *, int); +static void evalcommand(union node *, int); +static int evalbltin(const struct builtincmd *, int, char **); +static void prehash(union node *); /* - * XXX - should get rid of. have all builtins use getopt(3). the - * library getopt must have the BSD extension static variable "optreset" - * otherwise it can't be used within the shell safely. - * - * Standard option processing (a la getopt) for builtin routines. The - * only argument that is passed to nextopt is the option string; the - * other arguments are unnecessary. It return the character, or '\0' on - * end of input. + * Evaluate a parse tree. The value is left in the global variable + * exitstatus. */ - -static int -nextopt(const char *optstring) +static void +evaltree(union node *n, int flags) { - char *p; - const char *q; - char c; - - if ((p = optptr) == NULL || *p == '\0') { - p = *argptr; - if (p == NULL || *p != '-' || *++p == '\0') - return '\0'; - argptr++; - if (LONE_DASH(p)) /* check for "--" */ - return '\0'; + int checkexit = 0; + void (*evalfn)(union node *, int); + unsigned isor; + int status; + if (n == NULL) { + TRACE(("evaltree(NULL) called\n")); + goto out; } - c = *p++; - for (q = optstring ; *q != c ; ) { - if (*q == '\0') - sh_error("Illegal option -%c", c); - if (*++q == ':') - q++; + TRACE(("pid %d, evaltree(%p: %d, %d) called\n", + getpid(), n, n->type, flags)); + switch (n->type) { + default: +#if DEBUG + out1fmt("Node type = %d\n", n->type); + fflush(stdout); + break; +#endif + case NNOT: + evaltree(n->nnot.com, EV_TESTED); + status = !exitstatus; + goto setstatus; + case NREDIR: + expredir(n->nredir.redirect); + status = redirectsafe(n->nredir.redirect, REDIR_PUSH); + if (!status) { + evaltree(n->nredir.n, flags & EV_TESTED); + status = exitstatus; + } + popredir(0); + goto setstatus; + case NCMD: + evalfn = evalcommand; + checkexit: + if (eflag && !(flags & EV_TESTED)) + checkexit = ~0; + goto calleval; + case NFOR: + evalfn = evalfor; + goto calleval; + case NWHILE: + case NUNTIL: + evalfn = evalloop; + goto calleval; + case NSUBSHELL: + case NBACKGND: + evalfn = evalsubshell; + goto calleval; + case NPIPE: + evalfn = evalpipe; + goto checkexit; + case NCASE: + evalfn = evalcase; + goto calleval; + case NAND: + case NOR: + case NSEMI: +#if NAND + 1 != NOR +#error NAND + 1 != NOR +#endif +#if NOR + 1 != NSEMI +#error NOR + 1 != NSEMI +#endif + isor = n->type - NAND; + evaltree( + n->nbinary.ch1, + (flags | ((isor >> 1) - 1)) & EV_TESTED + ); + if (!exitstatus == isor) + break; + if (!evalskip) { + n = n->nbinary.ch2; + evaln: + evalfn = evaltree; + calleval: + evalfn(n, flags); + break; + } + break; + case NIF: + evaltree(n->nif.test, EV_TESTED); + if (evalskip) + break; + if (exitstatus == 0) { + n = n->nif.ifpart; + goto evaln; + } else if (n->nif.elsepart) { + n = n->nif.elsepart; + goto evaln; + } + goto success; + case NDEFUN: + defun(n->narg.text, n->narg.next); + success: + status = 0; + setstatus: + exitstatus = status; + break; } - if (*++q == ':') { - if (*p == '\0' && (p = *argptr++) == NULL) - sh_error("No arg for -%c option", c); - optionarg = p; - p = NULL; + out: + if ((checkexit & exitstatus)) + evalskip |= SKIPEVAL; + else if (pendingsig && dotrap()) + goto exexit; + + if (flags & EV_EXIT) { + exexit: + raise_exception(EXEXIT); } - optptr = p; - return c; } +#if !defined(__alpha__) || (defined(__GNUC__) && __GNUC__ >= 3) +static +#endif +void evaltreenr(union node *, int) __attribute__ ((alias("evaltree"),__noreturn__)); -/* output.c */ +static int loopnest; /* current loop nesting level */ -void -outstr(const char *p, FILE *file) +static void +evalloop(union node *n, int flags) { - INTOFF; - fputs(p, file); - INTON; -} + int status; -void -flushall(void) -{ - INTOFF; - fflush(stdout); - fflush(stderr); - INTON; -} + loopnest++; + status = 0; + flags &= EV_TESTED; + for (;;) { + int i; -void -flusherr(void) -{ - INTOFF; - fflush(stderr); - INTON; + evaltree(n->nbinary.ch1, EV_TESTED); + if (evalskip) { + skipping: + if (evalskip == SKIPCONT && --skipcount <= 0) { + evalskip = 0; + continue; + } + if (evalskip == SKIPBREAK && --skipcount <= 0) + evalskip = 0; + break; + } + i = exitstatus; + if (n->type != NWHILE) + i = !i; + if (i != 0) + break; + evaltree(n->nbinary.ch2, flags); + status = exitstatus; + if (evalskip) + goto skipping; + } + loopnest--; + exitstatus = status; } static void -outcslow(int c, FILE *dest) +evalfor(union node *n, int flags) { - INTOFF; - putc(c, dest); - fflush(dest); - INTON; -} - + struct arglist arglist; + union node *argp; + struct strlist *sp; + struct stackmark smark; -static int -out1fmt(const char *fmt, ...) -{ - va_list ap; - int r; + setstackmark(&smark); + arglist.lastp = &arglist.list; + for (argp = n->nfor.args; argp; argp = argp->narg.next) { + expandarg(argp, &arglist, EXP_FULL | EXP_TILDE | EXP_RECORD); + /* XXX */ + if (evalskip) + goto out; + } + *arglist.lastp = NULL; - INTOFF; - va_start(ap, fmt); - r = vprintf(fmt, ap); - va_end(ap); - INTON; - return r; + exitstatus = 0; + loopnest++; + flags &= EV_TESTED; + for (sp = arglist.list; sp; sp = sp->next) { + setvar(n->nfor.var, sp->text, 0); + evaltree(n->nfor.body, flags); + if (evalskip) { + if (evalskip == SKIPCONT && --skipcount <= 0) { + evalskip = 0; + continue; + } + if (evalskip == SKIPBREAK && --skipcount <= 0) + evalskip = 0; + break; + } + } + loopnest--; + out: + popstackmark(&smark); } - -int -fmtstr(char *outbuf, size_t length, const char *fmt, ...) +static void +evalcase(union node *n, int flags) { - va_list ap; - int ret; + union node *cp; + union node *patp; + struct arglist arglist; + struct stackmark smark; - va_start(ap, fmt); - INTOFF; - ret = vsnprintf(outbuf, length, fmt, ap); - va_end(ap); - INTON; - return ret; + setstackmark(&smark); + arglist.lastp = &arglist.list; + expandarg(n->ncase.expr, &arglist, EXP_TILDE); + exitstatus = 0; + for (cp = n->ncase.cases; cp && evalskip == 0; cp = cp->nclist.next) { + for (patp = cp->nclist.pattern; patp; patp = patp->narg.next) { + if (casematch(patp, arglist.list->text)) { + if (evalskip == 0) { + evaltree(cp->nclist.body, flags); + } + goto out; + } + } + } + out: + popstackmark(&smark); } - - -/* parser.c */ - - -/* - * Shell command parser. - */ - -#define EOFMARKLEN 79 - - -struct heredoc { - struct heredoc *next; /* next here document in list */ - union node *here; /* redirection node */ - char *eofmark; /* string indicating end of input */ - int striptabs; /* if set, strip leading tabs */ -}; - - - -static struct heredoc *heredoclist; /* list of here documents to read */ - - -static union node *list(int); -static union node *andor(void); -static union node *pipeline(void); -static union node *command(void); -static union node *simplecmd(void); -static union node *makename(void); -static void parsefname(void); -static void parseheredoc(void); -static char peektoken(void); -static int readtoken(void); -static int xxreadtoken(void); -static int readtoken1(int firstc, int syntax, char *eofmark, int striptabs); -static int noexpand(char *); -static void synexpect(int) ATTRIBUTE_NORETURN; -static void synerror(const char *) ATTRIBUTE_NORETURN; -static void setprompt(int); - - - - /* - * Read and parse a command. Returns NEOF on end of file. (NULL is a - * valid parse tree indicating a blank line.) + * Kick off a subshell to evaluate a tree. */ - -union node * -parsecmd(int interact) +static void +evalsubshell(union node *n, int flags) { - int t; + struct job *jp; + int backgnd = (n->type == NBACKGND); + int status; - tokpushback = 0; - doprompt = interact; - if (doprompt) - setprompt(doprompt); - needprompt = 0; - t = readtoken(); - if (t == TEOF) - return NEOF; - if (t == TNL) - return NULL; - tokpushback++; - return list(1); + expredir(n->nredir.redirect); + if (!backgnd && flags & EV_EXIT && !trap[0]) + goto nofork; + INT_OFF; + jp = makejob(n, 1); + if (forkshell(jp, n, backgnd) == 0) { + INT_ON; + flags |= EV_EXIT; + if (backgnd) + flags &=~ EV_TESTED; + nofork: + redirect(n->nredir.redirect, 0); + evaltreenr(n->nredir.n, flags); + /* never returns */ + } + status = 0; + if (! backgnd) + status = waitforjob(jp); + exitstatus = status; + INT_ON; } - -static union node * -list(int nlflag) -{ - union node *n1, *n2, *n3; - int tok; - - checkkwd = CHKNL | CHKKWD | CHKALIAS; - if (nlflag == 2 && peektoken()) - return NULL; - n1 = NULL; - for (;;) { - n2 = andor(); - tok = readtoken(); - if (tok == TBACKGND) { - if (n2->type == NPIPE) { - n2->npipe.backgnd = 1; - } else { - if (n2->type != NREDIR) { - n3 = stalloc(sizeof(struct nredir)); - n3->nredir.n = n2; - n3->nredir.redirect = NULL; - n2 = n3; - } - n2->type = NBACKGND; - } - } - if (n1 == NULL) { - n1 = n2; - } - else { - n3 = (union node *)stalloc(sizeof (struct nbinary)); - n3->type = NSEMI; - n3->nbinary.ch1 = n1; - n3->nbinary.ch2 = n2; - n1 = n3; - } - switch (tok) { - case TBACKGND: - case TSEMI: - tok = readtoken(); - /* fall through */ - case TNL: - if (tok == TNL) { - parseheredoc(); - if (nlflag == 1) - return n1; - } else { - tokpushback++; +/* + * Compute the names of the files in a redirection list. + */ +static void fixredir(union node *, const char *, int); +static void +expredir(union node *n) +{ + union node *redir; + + for (redir = n; redir; redir = redir->nfile.next) { + struct arglist fn; + + memset(&fn, 0, sizeof(fn)); + fn.lastp = &fn.list; + switch (redir->type) { + case NFROMTO: + case NFROM: + case NTO: + case NCLOBBER: + case NAPPEND: + expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR); + redir->nfile.expfname = fn.list->text; + break; + case NFROMFD: + case NTOFD: + if (redir->ndup.vname) { + expandarg(redir->ndup.vname, &fn, EXP_FULL | EXP_TILDE); + if (fn.list == NULL) + ash_msg_and_raise_error("redir error"); + fixredir(redir, fn.list->text, 1); } - checkkwd = CHKNL | CHKKWD | CHKALIAS; - if (peektoken()) - return n1; break; - case TEOF: - if (heredoclist) - parseheredoc(); - else - pungetc(); /* push back EOF on input */ - return n1; - default: - if (nlflag == 1) - synexpect(-1); - tokpushback++; - return n1; } } } - - -static union node * -andor(void) +/* + * Evaluate a pipeline. All the processes in the pipeline are children + * of the process creating the pipeline. (This differs from some versions + * of the shell, which make the last process in a pipeline the parent + * of all the rest.) + */ +static void +evalpipe(union node *n, int flags) { - union node *n1, *n2, *n3; - int t; + struct job *jp; + struct nodelist *lp; + int pipelen; + int prevfd; + int pip[2]; - n1 = pipeline(); - for (;;) { - if ((t = readtoken()) == TAND) { - t = NAND; - } else if (t == TOR) { - t = NOR; - } else { - tokpushback++; - return n1; + TRACE(("evalpipe(0x%lx) called\n", (long)n)); + pipelen = 0; + for (lp = n->npipe.cmdlist; lp; lp = lp->next) + pipelen++; + flags |= EV_EXIT; + INT_OFF; + jp = makejob(n, pipelen); + prevfd = -1; + for (lp = n->npipe.cmdlist; lp; lp = lp->next) { + prehash(lp->n); + pip[1] = -1; + if (lp->next) { + if (pipe(pip) < 0) { + close(prevfd); + ash_msg_and_raise_error("pipe call failed"); + } } - checkkwd = CHKNL | CHKKWD | CHKALIAS; - n2 = pipeline(); - n3 = (union node *)stalloc(sizeof (struct nbinary)); - n3->type = t; - n3->nbinary.ch1 = n1; - n3->nbinary.ch2 = n2; - n1 = n3; + if (forkshell(jp, lp->n, n->npipe.backgnd) == 0) { + INT_ON; + if (pip[1] >= 0) { + close(pip[0]); + } + if (prevfd > 0) { + dup2(prevfd, 0); + close(prevfd); + } + if (pip[1] > 1) { + dup2(pip[1], 1); + close(pip[1]); + } + evaltreenr(lp->n, flags); + /* never returns */ + } + if (prevfd >= 0) + close(prevfd); + prevfd = pip[0]; + close(pip[1]); + } + if (n->npipe.backgnd == 0) { + exitstatus = waitforjob(jp); + TRACE(("evalpipe: job done exit status %d\n", exitstatus)); } + INT_ON; } - - -static union node * -pipeline(void) +/* + * Controls whether the shell is interactive or not. + */ +static void +setinteractive(int on) { - union node *n1, *n2, *pipenode; - struct nodelist *lp, *prev; - int negate; + static int is_interactive; - negate = 0; - TRACE(("pipeline: entered\n")); - if (readtoken() == TNOT) { - negate = !negate; - checkkwd = CHKKWD | CHKALIAS; - } else - tokpushback++; - n1 = command(); - if (readtoken() == TPIPE) { - pipenode = (union node *)stalloc(sizeof (struct npipe)); - pipenode->type = NPIPE; - pipenode->npipe.backgnd = 0; - lp = (struct nodelist *)stalloc(sizeof (struct nodelist)); - pipenode->npipe.cmdlist = lp; - lp->n = n1; - do { - prev = lp; - lp = (struct nodelist *)stalloc(sizeof (struct nodelist)); - checkkwd = CHKNL | CHKKWD | CHKALIAS; - lp->n = command(); - prev->next = lp; - } while (readtoken() == TPIPE); - lp->next = NULL; - n1 = pipenode; + if (++on == is_interactive) + return; + is_interactive = on; + setsignal(SIGINT); + setsignal(SIGQUIT); + setsignal(SIGTERM); +#if !ENABLE_FEATURE_SH_EXTRA_QUIET + if (is_interactive > 1) { + /* Looks like they want an interactive shell */ + static smallint did_banner; + + if (!did_banner) { + out1fmt( + "\n\n" + "%s built-in shell (ash)\n" + "Enter 'help' for a list of built-in commands." + "\n\n", + bb_banner); + did_banner = 1; + } } - tokpushback++; - if (negate) { - n2 = (union node *)stalloc(sizeof (struct nnot)); - n2->type = NNOT; - n2->nnot.com = n1; - return n2; - } else - return n1; +#endif } +#if ENABLE_FEATURE_EDITING_VI +#define setvimode(on) do { \ + if (on) line_input_state->flags |= VI_MODE; \ + else line_input_state->flags &= ~VI_MODE; \ +} while (0) +#else +#define setvimode(on) viflag = 0 /* forcibly keep the option off */ +#endif - -static union node * -command(void) +static void +optschanged(void) { - union node *n1, *n2; - union node *ap, **app; - union node *cp, **cpp; - union node *redir, **rpp; - union node **rpp2; - int t; +#if DEBUG + opentrace(); +#endif + setinteractive(iflag); + setjobctl(mflag); + setvimode(viflag); +} - redir = NULL; - rpp2 = &redir; +static struct localvar *localvars; - switch (readtoken()) { - default: - synexpect(-1); - /* NOTREACHED */ - case TIF: - n1 = (union node *)stalloc(sizeof (struct nif)); - n1->type = NIF; - n1->nif.test = list(0); - if (readtoken() != TTHEN) - synexpect(TTHEN); - n1->nif.ifpart = list(0); - n2 = n1; - while (readtoken() == TELIF) { - n2->nif.elsepart = (union node *)stalloc(sizeof (struct nif)); - n2 = n2->nif.elsepart; - n2->type = NIF; - n2->nif.test = list(0); - if (readtoken() != TTHEN) - synexpect(TTHEN); - n2->nif.ifpart = list(0); - } - if (lasttoken == TELSE) - n2->nif.elsepart = list(0); - else { - n2->nif.elsepart = NULL; - tokpushback++; - } - t = TFI; - break; - case TWHILE: - case TUNTIL: { - int got; - n1 = (union node *)stalloc(sizeof (struct nbinary)); - n1->type = (lasttoken == TWHILE)? NWHILE : NUNTIL; - n1->nbinary.ch1 = list(0); - if ((got=readtoken()) != TDO) { -TRACE(("expecting DO got %s %s\n", tokname(got), got == TWORD ? wordtext : "")); - synexpect(TDO); +/* + * Called after a function returns. + * Interrupts must be off. + */ +static void +poplocalvars(void) +{ + struct localvar *lvp; + struct var *vp; + + while ((lvp = localvars) != NULL) { + localvars = lvp->next; + vp = lvp->vp; + TRACE(("poplocalvar %s", vp ? vp->text : "-")); + if (vp == NULL) { /* $- saved */ + memcpy(optlist, lvp->text, sizeof(optlist)); + free((char*)lvp->text); + optschanged(); + } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) { + unsetvar(vp->text); + } else { + if (vp->func) + (*vp->func)(strchrnul(lvp->text, '=') + 1); + if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0) + free((char*)vp->text); + vp->flags = lvp->flags; + vp->text = lvp->text; } - n1->nbinary.ch2 = list(0); - t = TDONE; - break; + free(lvp); } - case TFOR: - if (readtoken() != TWORD || quoteflag || ! goodname(wordtext)) - synerror("Bad for loop variable"); - n1 = (union node *)stalloc(sizeof (struct nfor)); - n1->type = NFOR; - n1->nfor.var = wordtext; - checkkwd = CHKKWD | CHKALIAS; - if (readtoken() == TIN) { - app = ≈ - while (readtoken() == TWORD) { - n2 = (union node *)stalloc(sizeof (struct narg)); - n2->type = NARG; - n2->narg.text = wordtext; - n2->narg.backquote = backquotelist; - *app = n2; - app = &n2->narg.next; - } - *app = NULL; - n1->nfor.args = ap; - if (lasttoken != TNL && lasttoken != TSEMI) - synexpect(-1); - } else { - n2 = (union node *)stalloc(sizeof (struct narg)); - n2->type = NARG; - n2->narg.text = (char *)dolatstr; - n2->narg.backquote = NULL; - n2->narg.next = NULL; - n1->nfor.args = n2; - /* - * Newline or semicolon here is optional (but note - * that the original Bourne shell only allowed NL). - */ - if (lasttoken != TNL && lasttoken != TSEMI) - tokpushback++; +} + +static int +evalfun(struct funcnode *func, int argc, char **argv, int flags) +{ + volatile struct shparam saveparam; + struct localvar *volatile savelocalvars; + struct jmploc *volatile savehandler; + struct jmploc jmploc; + int e; + + saveparam = shellparam; + savelocalvars = localvars; + e = setjmp(jmploc.loc); + if (e) { + goto funcdone; + } + INT_OFF; + savehandler = exception_handler; + exception_handler = &jmploc; + localvars = NULL; + shellparam.malloc = 0; + func->count++; + funcnest++; + INT_ON; + shellparam.nparam = argc - 1; + shellparam.p = argv + 1; +#if ENABLE_ASH_GETOPTS + shellparam.optind = 1; + shellparam.optoff = -1; +#endif + evaltree(&func->n, flags & EV_TESTED); +funcdone: + INT_OFF; + funcnest--; + freefunc(func); + poplocalvars(); + localvars = savelocalvars; + freeparam(&shellparam); + shellparam = saveparam; + exception_handler = savehandler; + INT_ON; + evalskip &= ~SKIPFUNC; + return e; +} + +#if ENABLE_ASH_CMDCMD +static char ** +parse_command_args(char **argv, const char **path) +{ + char *cp, c; + + for (;;) { + cp = *++argv; + if (!cp) + return 0; + if (*cp++ != '-') + break; + c = *cp++; + if (!c) + break; + if (c == '-' && !*cp) { + argv++; + break; } - checkkwd = CHKNL | CHKKWD | CHKALIAS; - if (readtoken() != TDO) - synexpect(TDO); - n1->nfor.body = list(0); - t = TDONE; - break; - case TCASE: - n1 = (union node *)stalloc(sizeof (struct ncase)); - n1->type = NCASE; - if (readtoken() != TWORD) - synexpect(TWORD); - n1->ncase.expr = n2 = (union node *)stalloc(sizeof (struct narg)); - n2->type = NARG; - n2->narg.text = wordtext; - n2->narg.backquote = backquotelist; - n2->narg.next = NULL; do { - checkkwd = CHKKWD | CHKALIAS; - } while (readtoken() == TNL); - if (lasttoken != TIN) - synexpect(TIN); - cpp = &n1->ncase.cases; -next_case: - checkkwd = CHKNL | CHKKWD; - t = readtoken(); - while(t != TESAC) { - if (lasttoken == TLP) - readtoken(); - *cpp = cp = (union node *)stalloc(sizeof (struct nclist)); - cp->type = NCLIST; - app = &cp->nclist.pattern; - for (;;) { - *app = ap = (union node *)stalloc(sizeof (struct narg)); - ap->type = NARG; - ap->narg.text = wordtext; - ap->narg.backquote = backquotelist; - if (readtoken() != TPIPE) - break; - app = &ap->narg.next; - readtoken(); + switch (c) { + case 'p': + *path = bb_default_path; + break; + default: + /* run 'typecmd' for other options */ + return 0; } - ap->narg.next = NULL; - if (lasttoken != TRP) - synexpect(TRP); - cp->nclist.body = list(2); + c = *cp++; + } while (c); + } + return argv; +} +#endif - cpp = &cp->nclist.next; +/* + * Make a variable a local variable. When a variable is made local, it's + * value and flags are saved in a localvar structure. The saved values + * will be restored when the shell function returns. We handle the name + * "-" as a special case. + */ +static void +mklocal(char *name) +{ + struct localvar *lvp; + struct var **vpp; + struct var *vp; - checkkwd = CHKNL | CHKKWD; - if ((t = readtoken()) != TESAC) { - if (t != TENDCASE) - synexpect(TENDCASE); - else - goto next_case; - } + INT_OFF; + lvp = ckmalloc(sizeof(struct localvar)); + if (LONE_DASH(name)) { + char *p; + p = ckmalloc(sizeof(optlist)); + lvp->text = memcpy(p, optlist, sizeof(optlist)); + vp = NULL; + } else { + char *eq; + + vpp = hashvar(name); + vp = *findvar(vpp, name); + eq = strchr(name, '='); + if (vp == NULL) { + if (eq) + setvareq(name, VSTRFIXED); + else + setvar(name, NULL, VSTRFIXED); + vp = *vpp; /* the new variable */ + lvp->flags = VUNSET; + } else { + lvp->text = vp->text; + lvp->flags = vp->flags; + vp->flags |= VSTRFIXED|VTEXTFIXED; + if (eq) + setvareq(name, 0); } - *cpp = NULL; - goto redir; - case TLP: - n1 = (union node *)stalloc(sizeof (struct nredir)); - n1->type = NSUBSHELL; - n1->nredir.n = list(0); - n1->nredir.redirect = NULL; - t = TRP; - break; - case TBEGIN: - n1 = list(0); - t = TEND; - break; - case TWORD: - case TREDIR: - tokpushback++; - return simplecmd(); } + lvp->vp = vp; + lvp->next = localvars; + localvars = lvp; + INT_ON; +} - if (readtoken() != t) - synexpect(t); +/* + * The "local" command. + */ +static int +localcmd(int argc, char **argv) +{ + char *name; -redir: - /* Now check for redirection which may follow command */ - checkkwd = CHKKWD | CHKALIAS; - rpp = rpp2; - while (readtoken() == TREDIR) { - *rpp = n2 = redirnode; - rpp = &n2->nfile.next; - parsefname(); + argv = argptr; + while ((name = *argv++) != NULL) { + mklocal(name); } - tokpushback++; - *rpp = NULL; - if (redir) { - if (n1->type != NSUBSHELL) { - n2 = (union node *)stalloc(sizeof (struct nredir)); - n2->type = NREDIR; - n2->nredir.n = n1; - n1 = n2; - } - n1->nredir.redirect = redir; + return 0; +} + +static int +falsecmd(int argc, char **argv) +{ + return 1; +} + +static int +truecmd(int argc, char **argv) +{ + return 0; +} + +static int +execcmd(int argc, char **argv) +{ + if (argc > 1) { + iflag = 0; /* exit on error */ + mflag = 0; + optschanged(); + shellexec(argv + 1, pathval(), 0); } + return 0; +} - return n1; +/* + * The return command. + */ +static int +returncmd(int argc, char **argv) +{ + /* + * If called outside a function, do what ksh does; + * skip the rest of the file. + */ + evalskip = funcnest ? SKIPFUNC : SKIPFILE; + return argv[1] ? number(argv[1]) : exitstatus; } +/* Forward declarations for builtintab[] */ +static int breakcmd(int, char **); +static int dotcmd(int, char **); +static int evalcmd(int, char **); +#if ENABLE_ASH_BUILTIN_ECHO +static int echocmd(int, char **); +#endif +#if ENABLE_ASH_BUILTIN_TEST +static int testcmd(int, char **); +#endif +static int exitcmd(int, char **); +static int exportcmd(int, char **); +#if ENABLE_ASH_GETOPTS +static int getoptscmd(int, char **); +#endif +#if !ENABLE_FEATURE_SH_EXTRA_QUIET +static int helpcmd(int argc, char **argv); +#endif +#if ENABLE_ASH_MATH_SUPPORT +static int letcmd(int, char **); +#endif +static int readcmd(int, char **); +static int setcmd(int, char **); +static int shiftcmd(int, char **); +static int timescmd(int, char **); +static int trapcmd(int, char **); +static int umaskcmd(int, char **); +static int unsetcmd(int, char **); +static int ulimitcmd(int, char **); + +#define BUILTIN_NOSPEC "0" +#define BUILTIN_SPECIAL "1" +#define BUILTIN_REGULAR "2" +#define BUILTIN_SPEC_REG "3" +#define BUILTIN_ASSIGN "4" +#define BUILTIN_SPEC_ASSG "5" +#define BUILTIN_REG_ASSG "6" +#define BUILTIN_SPEC_REG_ASSG "7" + +/* make sure to keep these in proper order since it is searched via bsearch() */ +static const struct builtincmd builtintab[] = { + { BUILTIN_SPEC_REG ".", dotcmd }, + { BUILTIN_SPEC_REG ":", truecmd }, +#if ENABLE_ASH_BUILTIN_TEST + { BUILTIN_REGULAR "[", testcmd }, + { BUILTIN_REGULAR "[[", testcmd }, +#endif +#if ENABLE_ASH_ALIAS + { BUILTIN_REG_ASSG "alias", aliascmd }, +#endif +#if JOBS + { BUILTIN_REGULAR "bg", fg_bgcmd }, +#endif + { BUILTIN_SPEC_REG "break", breakcmd }, + { BUILTIN_REGULAR "cd", cdcmd }, + { BUILTIN_NOSPEC "chdir", cdcmd }, +#if ENABLE_ASH_CMDCMD + { BUILTIN_REGULAR "command", commandcmd }, +#endif + { BUILTIN_SPEC_REG "continue", breakcmd }, +#if ENABLE_ASH_BUILTIN_ECHO + { BUILTIN_REGULAR "echo", echocmd }, +#endif + { BUILTIN_SPEC_REG "eval", evalcmd }, + { BUILTIN_SPEC_REG "exec", execcmd }, + { BUILTIN_SPEC_REG "exit", exitcmd }, + { BUILTIN_SPEC_REG_ASSG "export", exportcmd }, + { BUILTIN_REGULAR "false", falsecmd }, +#if JOBS + { BUILTIN_REGULAR "fg", fg_bgcmd }, +#endif +#if ENABLE_ASH_GETOPTS + { BUILTIN_REGULAR "getopts", getoptscmd }, +#endif + { BUILTIN_NOSPEC "hash", hashcmd }, +#if !ENABLE_FEATURE_SH_EXTRA_QUIET + { BUILTIN_NOSPEC "help", helpcmd }, +#endif +#if JOBS + { BUILTIN_REGULAR "jobs", jobscmd }, + { BUILTIN_REGULAR "kill", killcmd }, +#endif +#if ENABLE_ASH_MATH_SUPPORT + { BUILTIN_NOSPEC "let", letcmd }, +#endif + { BUILTIN_ASSIGN "local", localcmd }, + { BUILTIN_NOSPEC "pwd", pwdcmd }, + { BUILTIN_REGULAR "read", readcmd }, + { BUILTIN_SPEC_REG_ASSG "readonly", exportcmd }, + { BUILTIN_SPEC_REG "return", returncmd }, + { BUILTIN_SPEC_REG "set", setcmd }, + { BUILTIN_SPEC_REG "shift", shiftcmd }, + { BUILTIN_SPEC_REG "source", dotcmd }, +#if ENABLE_ASH_BUILTIN_TEST + { BUILTIN_REGULAR "test", testcmd }, +#endif + { BUILTIN_SPEC_REG "times", timescmd }, + { BUILTIN_SPEC_REG "trap", trapcmd }, + { BUILTIN_REGULAR "true", truecmd }, + { BUILTIN_NOSPEC "type", typecmd }, + { BUILTIN_NOSPEC "ulimit", ulimitcmd }, + { BUILTIN_REGULAR "umask", umaskcmd }, +#if ENABLE_ASH_ALIAS + { BUILTIN_REGULAR "unalias", unaliascmd }, +#endif + { BUILTIN_SPEC_REG "unset", unsetcmd }, + { BUILTIN_REGULAR "wait", waitcmd }, +}; -static union node * -simplecmd(void) { - union node *args, **app; - union node *n = NULL; - union node *vars, **vpp; - union node **rpp, *redir; - int savecheckkwd; - args = NULL; - app = &args; - vars = NULL; - vpp = &vars; - redir = NULL; - rpp = &redir; +#define COMMANDCMD (builtintab + 5 + \ + 2 * ENABLE_ASH_BUILTIN_TEST + \ + ENABLE_ASH_ALIAS + \ + ENABLE_ASH_JOB_CONTROL) +#define EXECCMD (builtintab + 7 + \ + 2 * ENABLE_ASH_BUILTIN_TEST + \ + ENABLE_ASH_ALIAS + \ + ENABLE_ASH_JOB_CONTROL + \ + ENABLE_ASH_CMDCMD + \ + ENABLE_ASH_BUILTIN_ECHO) - savecheckkwd = CHKALIAS; - for (;;) { - checkkwd = savecheckkwd; - switch (readtoken()) { - case TWORD: - n = (union node *)stalloc(sizeof (struct narg)); - n->type = NARG; - n->narg.text = wordtext; - n->narg.backquote = backquotelist; - if (savecheckkwd && isassignment(wordtext)) { - *vpp = n; - vpp = &n->narg.next; - } else { - *app = n; - app = &n->narg.next; - savecheckkwd = 0; - } - break; - case TREDIR: - *rpp = n = redirnode; - rpp = &n->nfile.next; - parsefname(); /* read name of redirection file */ - break; - case TLP: - if ( - args && app == &args->narg.next && - !vars && !redir - ) { - struct builtincmd *bcmd; - const char *name; +/* + * Search the table of builtin commands. + */ +static struct builtincmd * +find_builtin(const char *name) +{ + struct builtincmd *bp; - /* We have a function */ - if (readtoken() != TRP) - synexpect(TRP); - name = n->narg.text; - if ( - !goodname(name) || ( - (bcmd = find_builtin(name)) && - IS_BUILTIN_SPECIAL(bcmd) - ) - ) - synerror("Bad function name"); - n->type = NDEFUN; - checkkwd = CHKNL | CHKKWD | CHKALIAS; - n->narg.next = command(); - return n; - } - /* fall through */ - default: - tokpushback++; - goto out; - } - } -out: - *app = NULL; - *vpp = NULL; - *rpp = NULL; - n = (union node *)stalloc(sizeof (struct ncmd)); - n->type = NCMD; - n->ncmd.args = args; - n->ncmd.assign = vars; - n->ncmd.redirect = redir; - return n; + bp = bsearch( + name, builtintab, ARRAY_SIZE(builtintab), sizeof(builtintab[0]), + pstrcmp + ); + return bp; } -static union node * -makename(void) +/* + * Execute a simple command. + */ +static int back_exitstatus; /* exit status of backquoted command */ +static int +isassignment(const char *p) { - union node *n; - - n = (union node *)stalloc(sizeof (struct narg)); - n->type = NARG; - n->narg.next = NULL; - n->narg.text = wordtext; - n->narg.backquote = backquotelist; - return n; + const char *q = endofname(p); + if (p == q) + return 0; + return *q == '='; } - -void fixredir(union node *n, const char *text, int err) +static int +bltincmd(int argc, char **argv) { - TRACE(("Fix redir %s %d\n", text, err)); - if (!err) - n->ndup.vname = NULL; + /* Preserve exitstatus of a previous possible redirection + * as POSIX mandates */ + return back_exitstatus; +} +static void +evalcommand(union node *cmd, int flags) +{ + static const struct builtincmd bltin = { + "\0\0", bltincmd + }; + struct stackmark smark; + union node *argp; + struct arglist arglist; + struct arglist varlist; + char **argv; + int argc; + const struct strlist *sp; + struct cmdentry cmdentry; + struct job *jp; + char *lastarg; + const char *path; + int spclbltin; + int cmd_is_exec; + int status; + char **nargv; + struct builtincmd *bcmd; + int pseudovarflag = 0; - if (is_digit(text[0]) && text[1] == '\0') - n->ndup.dupfd = digit_val(text[0]); - else if (LONE_DASH(text)) - n->ndup.dupfd = -1; - else { + /* First expand the arguments. */ + TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags)); + setstackmark(&smark); + back_exitstatus = 0; - if (err) - synerror("Bad fd number"); - else - n->ndup.vname = makename(); + cmdentry.cmdtype = CMDBUILTIN; + cmdentry.u.cmd = &bltin; + varlist.lastp = &varlist.list; + *varlist.lastp = NULL; + arglist.lastp = &arglist.list; + *arglist.lastp = NULL; + + argc = 0; + if (cmd->ncmd.args) { + bcmd = find_builtin(cmd->ncmd.args->narg.text); + pseudovarflag = bcmd && IS_BUILTIN_ASSIGN(bcmd); } -} + for (argp = cmd->ncmd.args; argp; argp = argp->narg.next) { + struct strlist **spp; -static void -parsefname(void) -{ - union node *n = redirnode; + spp = arglist.lastp; + if (pseudovarflag && isassignment(argp->narg.text)) + expandarg(argp, &arglist, EXP_VARTILDE); + else + expandarg(argp, &arglist, EXP_FULL | EXP_TILDE); - if (readtoken() != TWORD) - synexpect(-1); - if (n->type == NHERE) { - struct heredoc *here = heredoc; - struct heredoc *p; - int i; + for (sp = *spp; sp; sp = sp->next) + argc++; + } - if (quoteflag == 0) - n->type = NXHERE; - TRACE(("Here document %d\n", n->type)); - if (! noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN) - synerror("Illegal eof marker for << redirection"); - rmescapes(wordtext); - here->eofmark = wordtext; - here->next = NULL; - if (heredoclist == NULL) - heredoclist = here; - else { - for (p = heredoclist ; p->next ; p = p->next); - p->next = here; - } - } else if (n->type == NTOFD || n->type == NFROMFD) { - fixredir(n, wordtext, 0); - } else { - n->nfile.fname = makename(); + argv = nargv = stalloc(sizeof(char *) * (argc + 1)); + for (sp = arglist.list; sp; sp = sp->next) { + TRACE(("evalcommand arg: %s\n", sp->text)); + *nargv++ = sp->text; } -} + *nargv = NULL; + lastarg = NULL; + if (iflag && funcnest == 0 && argc > 0) + lastarg = nargv[-1]; -/* - * Input any here documents. - */ + preverrout_fd = 2; + expredir(cmd->ncmd.redirect); + status = redirectsafe(cmd->ncmd.redirect, REDIR_PUSH | REDIR_SAVEFD2); -static void -parseheredoc(void) -{ - struct heredoc *here; - union node *n; + path = vpath.text; + for (argp = cmd->ncmd.assign; argp; argp = argp->narg.next) { + struct strlist **spp; + char *p; - here = heredoclist; - heredoclist = 0; + spp = varlist.lastp; + expandarg(argp, &varlist, EXP_VARTILDE); + + /* + * Modify the command lookup path, if a PATH= assignment + * is present + */ + p = (*spp)->text; + if (varequal(p, path)) + path = p; + } + + /* Print the command if xflag is set. */ + if (xflag) { + int n; + const char *p = " %s"; + + p++; + dprintf(preverrout_fd, p, expandstr(ps4val())); - while (here) { - if (needprompt) { - setprompt(2); + sp = varlist.list; + for (n = 0; n < 2; n++) { + while (sp) { + dprintf(preverrout_fd, p, sp->text); + sp = sp->next; + if (*p == '%') { + p--; + } + } + sp = arglist.list; } - readtoken1(pgetc(), here->here->type == NHERE? SQSYNTAX : DQSYNTAX, - here->eofmark, here->striptabs); - n = (union node *)stalloc(sizeof (struct narg)); - n->narg.type = NARG; - n->narg.next = NULL; - n->narg.text = wordtext; - n->narg.backquote = backquotelist; - here->here->nhere.doc = n; - here = here->next; + full_write(preverrout_fd, "\n", 1); } -} -static char peektoken(void) -{ - int t; + cmd_is_exec = 0; + spclbltin = -1; - t = readtoken(); - tokpushback++; - return tokname_array[t][0]; -} + /* Now locate the command. */ + if (argc) { + const char *oldpath; + int cmd_flag = DO_ERR; -static int -readtoken(void) -{ - int t; -#if DEBUG - int alreadyseen = tokpushback; -#endif + path += 5; + oldpath = path; + for (;;) { + find_command(argv[0], &cmdentry, cmd_flag, path); + if (cmdentry.cmdtype == CMDUNKNOWN) { + status = 127; + flush_stderr(); + goto bail; + } -#ifdef CONFIG_ASH_ALIAS -top: + /* implement bltin and command here */ + if (cmdentry.cmdtype != CMDBUILTIN) + break; + if (spclbltin < 0) + spclbltin = IS_BUILTIN_SPECIAL(cmdentry.u.cmd); + if (cmdentry.u.cmd == EXECCMD) + cmd_is_exec++; +#if ENABLE_ASH_CMDCMD + if (cmdentry.u.cmd == COMMANDCMD) { + path = oldpath; + nargv = parse_command_args(argv, &path); + if (!nargv) + break; + argc -= nargv - argv; + argv = nargv; + cmd_flag |= DO_NOFUNC; + } else #endif - - t = xxreadtoken(); - - /* - * eat newlines - */ - if (checkkwd & CHKNL) { - while (t == TNL) { - parseheredoc(); - t = xxreadtoken(); + break; } } - if (t != TWORD || quoteflag) { + if (status) { + /* We have a redirection error. */ + if (spclbltin > 0) + raise_exception(EXERROR); + bail: + exitstatus = status; goto out; } - /* - * check for keywords - */ - if (checkkwd & CHKKWD) { - const char *const *pp; - - if ((pp = findkwd(wordtext))) { - lasttoken = t = pp - tokname_array; - TRACE(("keyword %s recognized\n", tokname(t))); - goto out; + /* Execute the command. */ + switch (cmdentry.cmdtype) { + default: + /* Fork off a child process if necessary. */ + if (!(flags & EV_EXIT) || trap[0]) { + INT_OFF; + jp = makejob(cmd, 1); + if (forkshell(jp, cmd, FORK_FG) != 0) { + exitstatus = waitforjob(jp); + INT_ON; + break; + } + FORCE_INT_ON; } - } + listsetvar(varlist.list, VEXPORT|VSTACK); + shellexec(argv, path, cmdentry.u.index); + /* NOTREACHED */ - if (checkkwd & CHKALIAS) { -#ifdef CONFIG_ASH_ALIAS - struct alias *ap; - if ((ap = lookupalias(wordtext, 1)) != NULL) { - if (*ap->val) { - pushstring(ap->val, ap); + case CMDBUILTIN: + cmdenviron = varlist.list; + if (cmdenviron) { + struct strlist *list = cmdenviron; + int i = VNOSET; + if (spclbltin > 0 || argc == 0) { + i = 0; + if (cmd_is_exec && argc > 1) + i = VEXPORT; } - goto top; + listsetvar(list, i); } -#endif - } -out: - checkkwd = 0; -#if DEBUG - if (!alreadyseen) - TRACE(("token %s %s\n", tokname(t), t == TWORD ? wordtext : "")); - else - TRACE(("reread token %s %s\n", tokname(t), t == TWORD ? wordtext : "")); -#endif - return t; -} - - -/* - * Read the next input token. - * If the token is a word, we set backquotelist to the list of cmds in - * backquotes. We set quoteflag to true if any part of the word was - * quoted. - * If the token is TREDIR, then we set redirnode to a structure containing - * the redirection. - * In all cases, the variable startlinno is set to the number of the line - * on which the token starts. - * - * [Change comment: here documents and internal procedures] - * [Readtoken shouldn't have any arguments. Perhaps we should make the - * word parsing code into a separate routine. In this case, readtoken - * doesn't need to have any internal procedures, but parseword does. - * We could also make parseoperator in essence the main routine, and - * have parseword (readtoken1?) handle both words and redirection.] - */ - -#define NEW_xxreadtoken -#ifdef NEW_xxreadtoken - -/* singles must be first! */ -static const char xxreadtoken_chars[7] = { '\n', '(', ')', '&', '|', ';', 0 }; + if (evalbltin(cmdentry.u.cmd, argc, argv)) { + int exit_status; + int i, j; -static const char xxreadtoken_tokens[] = { - TNL, TLP, TRP, /* only single occurrence allowed */ - TBACKGND, TPIPE, TSEMI, /* if single occurrence */ - TEOF, /* corresponds to trailing nul */ - TAND, TOR, TENDCASE, /* if double occurrence */ -}; + i = exception; + if (i == EXEXIT) + goto raise; -#define xxreadtoken_doubles \ - (sizeof(xxreadtoken_tokens) - sizeof(xxreadtoken_chars)) -#define xxreadtoken_singles \ - (sizeof(xxreadtoken_chars) - xxreadtoken_doubles - 1) + exit_status = 2; + j = 0; + if (i == EXINT) + j = SIGINT; + if (i == EXSIG) + j = pendingsig; + if (j) + exit_status = j + 128; + exitstatus = exit_status; -static int xxreadtoken(void) -{ - int c; + if (i == EXINT || spclbltin > 0) { + raise: + longjmp(exception_handler->loc, 1); + } + FORCE_INT_ON; + } + break; - if (tokpushback) { - tokpushback = 0; - return lasttoken; - } - if (needprompt) { - setprompt(2); + case CMDFUNCTION: + listsetvar(varlist.list, 0); + if (evalfun(cmdentry.u.func, argc, argv, flags)) + goto raise; + break; } - startlinno = plinno; - for (;;) { /* until token or start of word found */ - c = pgetc_macro(); - if ((c != ' ') && (c != '\t') -#ifdef CONFIG_ASH_ALIAS - && (c != PEOA) -#endif - ) { - if (c == '#') { - while ((c = pgetc()) != '\n' && c != PEOF); - pungetc(); - } else if (c == '\\') { - if (pgetc() != '\n') { - pungetc(); - goto READTOKEN1; - } - startlinno = ++plinno; - if (doprompt) - setprompt(2); - } else { - const char *p - = xxreadtoken_chars + sizeof(xxreadtoken_chars) - 1; - - if (c != PEOF) { - if (c == '\n') { - plinno++; - needprompt = doprompt; - } + out: + popredir(cmd_is_exec); + if (lastarg) + /* dsl: I think this is intended to be used to support + * '_' in 'vi' command mode during line editing... + * However I implemented that within libedit itself. + */ + setvar("_", lastarg, 0); + popstackmark(&smark); +} - p = strchr(xxreadtoken_chars, c); - if (p == NULL) { - READTOKEN1: - return readtoken1(c, BASESYNTAX, (char *) NULL, 0); - } +static int +evalbltin(const struct builtincmd *cmd, int argc, char **argv) +{ + char *volatile savecmdname; + struct jmploc *volatile savehandler; + struct jmploc jmploc; + int i; - if (p - xxreadtoken_chars >= xxreadtoken_singles) { - if (pgetc() == *p) { /* double occurrence? */ - p += xxreadtoken_doubles + 1; - } else { - pungetc(); - } - } - } + savecmdname = commandname; + i = setjmp(jmploc.loc); + if (i) + goto cmddone; + savehandler = exception_handler; + exception_handler = &jmploc; + commandname = argv[0]; + argptr = argv + 1; + optptr = NULL; /* initialize nextopt */ + exitstatus = (*cmd->builtin)(argc, argv); + flush_stdout_stderr(); + cmddone: + exitstatus |= ferror(stdout); + clearerr(stdout); + commandname = savecmdname; + exsig = 0; + exception_handler = savehandler; - return lasttoken = xxreadtoken_tokens[p - xxreadtoken_chars]; - } - } - } + return i; } +static int +goodname(const char *p) +{ + return !*endofname(p); +} -#else -#define RETURN(token) return lasttoken = token -static int -xxreadtoken(void) +/* + * Search for a command. This is called before we fork so that the + * location of the command will be available in the parent as well as + * the child. The check for "goodname" is an overly conservative + * check that the name will not be subject to expansion. + */ +static void +prehash(union node *n) { - int c; + struct cmdentry entry; - if (tokpushback) { - tokpushback = 0; - return lasttoken; - } - if (needprompt) { - setprompt(2); - } - startlinno = plinno; - for (;;) { /* until token or start of word found */ - c = pgetc_macro(); - switch (c) { - case ' ': case '\t': -#ifdef CONFIG_ASH_ALIAS - case PEOA: -#endif - continue; - case '#': - while ((c = pgetc()) != '\n' && c != PEOF); - pungetc(); - continue; - case '\\': - if (pgetc() == '\n') { - startlinno = ++plinno; - if (doprompt) - setprompt(2); - continue; - } - pungetc(); - goto breakloop; - case '\n': - plinno++; - needprompt = doprompt; - RETURN(TNL); - case PEOF: - RETURN(TEOF); - case '&': - if (pgetc() == '&') - RETURN(TAND); - pungetc(); - RETURN(TBACKGND); - case '|': - if (pgetc() == '|') - RETURN(TOR); - pungetc(); - RETURN(TPIPE); - case ';': - if (pgetc() == ';') - RETURN(TENDCASE); - pungetc(); - RETURN(TSEMI); - case '(': - RETURN(TLP); - case ')': - RETURN(TRP); - default: - goto breakloop; - } - } -breakloop: - return readtoken1(c, BASESYNTAX, (char *)NULL, 0); -#undef RETURN + if (n->type == NCMD && n->ncmd.args && goodname(n->ncmd.args->narg.text)) + find_command(n->ncmd.args->narg.text, &entry, 0, pathval()); } -#endif /* NEW_xxreadtoken */ -/* - * If eofmark is NULL, read a word or a redirection symbol. If eofmark - * is not NULL, read a here document. In the latter case, eofmark is the - * word which marks the end of the document and striptabs is true if - * leading tabs should be stripped from the document. The argument firstc - * is the first character of the input token or document. +/* ============ Builtin commands * - * Because C does not have internal subroutines, I have simulated them - * using goto's to implement the subroutine linkage. The following macros - * will run code that appears at the end of readtoken1. + * Builtin commands whose functions are closely tied to evaluation + * are implemented here. */ -#define CHECKEND() {goto checkend; checkend_return:;} -#define PARSEREDIR() {goto parseredir; parseredir_return:;} -#define PARSESUB() {goto parsesub; parsesub_return:;} -#define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;} -#define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;} -#define PARSEARITH() {goto parsearith; parsearith_return:;} - +/* + * Handle break and continue commands. Break, continue, and return are + * all handled by setting the evalskip flag. The evaluation routines + * above all check this flag, and if it is set they start skipping + * commands rather than executing them. The variable skipcount is + * the number of loops to break/continue, or the number of function + * levels to return. (The latter is always 1.) It should probably + * be an error to break out of more loops than exist, but it isn't + * in the standard shell so we don't make it one here. + */ static int -readtoken1(int firstc, int syntax, char *eofmark, int striptabs) +breakcmd(int argc, char **argv) { - int c = firstc; - char *out; - int len; - char line[EOFMARKLEN + 1]; - struct nodelist *bqlist = 0; - int quotef = 0; - int dblquote = 0; - int varnest = 0; /* levels of variables expansion */ - int arinest = 0; /* levels of arithmetic expansion */ - int parenlevel = 0; /* levels of parens in arithmetic */ - int dqvarnest = 0; /* levels of variables expansion within double quotes */ - int oldstyle = 0; - int prevsyntax = 0; /* syntax before arithmetic */ -#if __GNUC__ - /* Avoid longjmp clobbering */ - (void) &out; - (void) "ef; - (void) &dblquote; - (void) &varnest; - (void) &arinest; - (void) &parenlevel; - (void) &dqvarnest; - (void) &oldstyle; - (void) &prevsyntax; - (void) &syntax; -#endif + int n = argc > 1 ? number(argv[1]) : 1; - startlinno = plinno; - dblquote = 0; - if (syntax == DQSYNTAX) - dblquote = 1; - quotef = 0; - bqlist = NULL; - varnest = 0; - arinest = 0; - parenlevel = 0; - dqvarnest = 0; + if (n <= 0) + ash_msg_and_raise_error(illnum, argv[1]); + if (n > loopnest) + n = loopnest; + if (n > 0) { + evalskip = (**argv == 'c') ? SKIPCONT : SKIPBREAK; + skipcount = n; + } + return 0; +} - STARTSTACKSTR(out); - loop: { /* for each line, until end of word */ - CHECKEND(); /* set c to PEOF if at end of here document */ - for (;;) { /* until end of line or end of word */ - CHECKSTRSPACE(4, out); /* permit 4 calls to USTPUTC */ - switch(SIT(c, syntax)) { - case CNL: /* '\n' */ - if (syntax == BASESYNTAX) - goto endword; /* exit outer loop */ - USTPUTC(c, out); - plinno++; - if (doprompt) - setprompt(2); - c = pgetc(); - goto loop; /* continue outer loop */ - case CWORD: - USTPUTC(c, out); - break; - case CCTL: - if (eofmark == NULL || dblquote) - USTPUTC(CTLESC, out); - USTPUTC(c, out); - break; - case CBACK: /* backslash */ - c = pgetc2(); - if (c == PEOF) { - USTPUTC(CTLESC, out); - USTPUTC('\\', out); - pungetc(); - } else if (c == '\n') { - if (doprompt) - setprompt(2); - } else { - if (dblquote && - c != '\\' && c != '`' && - c != '$' && ( - c != '"' || - eofmark != NULL) - ) { - USTPUTC(CTLESC, out); - USTPUTC('\\', out); - } - if (SIT(c, SQSYNTAX) == CCTL) - USTPUTC(CTLESC, out); - USTPUTC(c, out); - quotef++; - } - break; - case CSQUOTE: - syntax = SQSYNTAX; -quotemark: - if (eofmark == NULL) { - USTPUTC(CTLQUOTEMARK, out); - } - break; - case CDQUOTE: - syntax = DQSYNTAX; - dblquote = 1; - goto quotemark; - case CENDQUOTE: - if (eofmark != NULL && arinest == 0 && - varnest == 0) { - USTPUTC(c, out); - } else { - if (dqvarnest == 0) { - syntax = BASESYNTAX; - dblquote = 0; - } - quotef++; - goto quotemark; - } - break; - case CVAR: /* '$' */ - PARSESUB(); /* parse substitution */ - break; - case CENDVAR: /* '}' */ - if (varnest > 0) { - varnest--; - if (dqvarnest > 0) { - dqvarnest--; - } - USTPUTC(CTLENDVAR, out); - } else { - USTPUTC(c, out); - } - break; -#ifdef CONFIG_ASH_MATH_SUPPORT - case CLP: /* '(' in arithmetic */ - parenlevel++; - USTPUTC(c, out); - break; - case CRP: /* ')' in arithmetic */ - if (parenlevel > 0) { - USTPUTC(c, out); - --parenlevel; - } else { - if (pgetc() == ')') { - if (--arinest == 0) { - USTPUTC(CTLENDARI, out); - syntax = prevsyntax; - if (syntax == DQSYNTAX) - dblquote = 1; - else - dblquote = 0; - } else - USTPUTC(')', out); - } else { - /* - * unbalanced parens - * (don't 2nd guess - no error) - */ - pungetc(); - USTPUTC(')', out); - } - } - break; + +/* ============ input.c + * + * This implements the input routines used by the parser. + */ + +#define EOF_NLEFT -99 /* value of parsenleft when EOF pushed back */ + +enum { + INPUT_PUSH_FILE = 1, + INPUT_NOFILE_OK = 2, +}; + +static int plinno = 1; /* input line number */ +/* number of characters left in input buffer */ +static int parsenleft; /* copy of parsefile->nleft */ +static int parselleft; /* copy of parsefile->lleft */ +/* next character in input buffer */ +static char *parsenextc; /* copy of parsefile->nextc */ + +static int checkkwd; +/* values of checkkwd variable */ +#define CHKALIAS 0x1 +#define CHKKWD 0x2 +#define CHKNL 0x4 + +static void +popstring(void) +{ + struct strpush *sp = parsefile->strpush; + + INT_OFF; +#if ENABLE_ASH_ALIAS + if (sp->ap) { + if (parsenextc[-1] == ' ' || parsenextc[-1] == '\t') { + checkkwd |= CHKALIAS; + } + if (sp->string != sp->ap->val) { + free(sp->string); + } + sp->ap->flag &= ~ALIASINUSE; + if (sp->ap->flag & ALIASDEAD) { + unalias(sp->ap->name); + } + } #endif - case CBQUOTE: /* '`' */ - PARSEBACKQOLD(); - break; - case CENDFILE: - goto endword; /* exit outer loop */ - case CIGN: - break; - default: - if (varnest == 0) - goto endword; /* exit outer loop */ -#ifdef CONFIG_ASH_ALIAS - if (c != PEOA) + parsenextc = sp->prevstring; + parsenleft = sp->prevnleft; +/*dprintf("*** calling popstring: restoring to '%s'\n", parsenextc);*/ + parsefile->strpush = sp->prev; + if (sp != &(parsefile->basestrpush)) + free(sp); + INT_ON; +} + +static int +preadfd(void) +{ + int nr; + char *buf = parsefile->buf; + parsenextc = buf; + + retry: +#if ENABLE_FEATURE_EDITING + if (!iflag || parsefile->fd) + nr = safe_read(parsefile->fd, buf, BUFSIZ - 1); + else { +#if ENABLE_FEATURE_TAB_COMPLETION + line_input_state->path_lookup = pathval(); +#endif + nr = read_line_input(cmdedit_prompt, buf, BUFSIZ, line_input_state); + if (nr == 0) { + /* Ctrl+C pressed */ + if (trap[SIGINT]) { + buf[0] = '\n'; + buf[1] = '\0'; + raise(SIGINT); + return 1; + } + goto retry; + } + if (nr < 0 && errno == 0) { + /* Ctrl+D presend */ + nr = 0; + } + } +#else + nr = safe_read(parsefile->fd, buf, BUFSIZ - 1); #endif - USTPUTC(c, out); + if (nr < 0) { + if (parsefile->fd == 0 && errno == EWOULDBLOCK) { + int flags = fcntl(0, F_GETFL); + if (flags >= 0 && flags & O_NONBLOCK) { + flags &=~ O_NONBLOCK; + if (fcntl(0, F_SETFL, flags) >= 0) { + out2str("sh: turning off NDELAY mode\n"); + goto retry; + } } - c = pgetc_macro(); } } -endword: -#ifdef CONFIG_ASH_MATH_SUPPORT - if (syntax == ARISYNTAX) - synerror("Missing '))'"); + return nr; +} + +/* + * Refill the input buffer and return the next input character: + * + * 1) If a string was pushed back on the input, pop it; + * 2) If an EOF was pushed back (parsenleft == EOF_NLEFT) or we are reading + * from a string so we can't refill the buffer, return EOF. + * 3) If the is more stuff in this buffer, use it else call read to fill it. + * 4) Process input up to the next newline, deleting nul characters. + */ +static int +preadbuffer(void) +{ + char *q; + int more; + char savec; + + while (parsefile->strpush) { +#if ENABLE_ASH_ALIAS + if (parsenleft == -1 && parsefile->strpush->ap && + parsenextc[-1] != ' ' && parsenextc[-1] != '\t') { + return PEOA; + } #endif - if (syntax != BASESYNTAX && ! parsebackquote && eofmark == NULL) - synerror("Unterminated quoted string"); - if (varnest != 0) { - startlinno = plinno; - /* { */ - synerror("Missing '}'"); + popstring(); + if (--parsenleft >= 0) + return signed_char2int(*parsenextc++); } - USTPUTC('\0', out); - len = out - (char *)stackblock(); - out = stackblock(); - if (eofmark == NULL) { - if ((c == '>' || c == '<') - && quotef == 0 - && len <= 2 - && (*out == '\0' || is_digit(*out))) { - PARSEREDIR(); - return lasttoken = TREDIR; - } else { - pungetc(); + if (parsenleft == EOF_NLEFT || parsefile->buf == NULL) + return PEOF; + flush_stdout_stderr(); + + more = parselleft; + if (more <= 0) { + again: + more = preadfd(); + if (more <= 0) { + parselleft = parsenleft = EOF_NLEFT; + return PEOF; } } - quoteflag = quotef; - backquotelist = bqlist; - grabstackblock(len); - wordtext = out; - return lasttoken = TWORD; -/* end of readtoken routine */ + q = parsenextc; + + /* delete nul characters */ + for (;;) { + int c; + + more--; + c = *q; + + if (!c) + memmove(q, q + 1, more); + else { + q++; + if (c == '\n') { + parsenleft = q - parsenextc - 1; + break; + } + } + + if (more <= 0) { + parsenleft = q - parsenextc - 1; + if (parsenleft < 0) + goto again; + break; + } + } + parselleft = more; + + savec = *q; + *q = '\0'; + + if (vflag) { + out2str(parsenextc); + } + + *q = savec; + + return signed_char2int(*parsenextc++); +} + +#define pgetc_as_macro() (--parsenleft >= 0? signed_char2int(*parsenextc++) : preadbuffer()) +static int +pgetc(void) +{ + return pgetc_as_macro(); +} +#if ENABLE_ASH_OPTIMIZE_FOR_SIZE +#define pgetc_macro() pgetc() +#else +#define pgetc_macro() pgetc_as_macro() +#endif /* - * Check to see whether we are at the end of the here document. When this - * is called, c is set to the first character of the next input line. If - * we are at the end of the here document, this routine sets the c to PEOF. + * Same as pgetc(), but ignores PEOA. */ +#if ENABLE_ASH_ALIAS +static int +pgetc2(void) +{ + int c; -checkend: { - if (eofmark) { -#ifdef CONFIG_ASH_ALIAS - if (c == PEOA) { - c = pgetc2(); - } + do { + c = pgetc_macro(); + } while (c == PEOA); + return c; +} +#else +static int +pgetc2(void) +{ + return pgetc_macro(); +} #endif - if (striptabs) { - while (c == '\t') { - c = pgetc2(); - } - } - if (c == *eofmark) { - if (pfgets(line, sizeof line) != NULL) { - char *p, *q; - p = line; - for (q = eofmark + 1 ; *q && *p == *q ; p++, q++); - if (*p == '\n' && *q == '\0') { - c = PEOF; - plinno++; - needprompt = doprompt; - } else { - pushstring(line, NULL); - } - } +/* + * Read a line from the script. + */ +static char * +pfgets(char *line, int len) +{ + char *p = line; + int nleft = len; + int c; + + while (--nleft > 0) { + c = pgetc2(); + if (c == PEOF) { + if (p == line) + return NULL; + break; } + *p++ = c; + if (c == '\n') + break; + } + *p = '\0'; + return line; +} + +/* + * Undo the last call to pgetc. Only one character may be pushed back. + * PEOF may be pushed back. + */ +static void +pungetc(void) +{ + parsenleft++; + parsenextc--; +} + +/* + * Push a string back onto the input at this current parsefile level. + * We handle aliases this way. + */ +static void +pushstring(char *s, void *ap) +{ + struct strpush *sp; + size_t len; + + len = strlen(s); + INT_OFF; +/*dprintf("*** calling pushstring: %s, %d\n", s, len);*/ + if (parsefile->strpush) { + sp = ckmalloc(sizeof(struct strpush)); + sp->prev = parsefile->strpush; + parsefile->strpush = sp; + } else + sp = parsefile->strpush = &(parsefile->basestrpush); + sp->prevstring = parsenextc; + sp->prevnleft = parsenleft; +#if ENABLE_ASH_ALIAS + sp->ap = (struct alias *)ap; + if (ap) { + ((struct alias *)ap)->flag |= ALIASINUSE; + sp->string = s; } - goto checkend_return; +#endif + parsenextc = s; + parsenleft = len; + INT_ON; } - /* - * Parse a redirection operator. The variable "out" points to a string - * specifying the fd to be redirected. The variable "c" contains the - * first character of the redirection operator. + * To handle the "." command, a stack of input files is used. Pushfile + * adds a new entry to the stack and popfile restores the previous level. */ +static void +pushfile(void) +{ + struct parsefile *pf; -parseredir: { - char fd = *out; - union node *np; + parsefile->nleft = parsenleft; + parsefile->lleft = parselleft; + parsefile->nextc = parsenextc; + parsefile->linno = plinno; + pf = ckmalloc(sizeof(*pf)); + pf->prev = parsefile; + pf->fd = -1; + pf->strpush = NULL; + pf->basestrpush.prev = NULL; + parsefile = pf; +} - np = (union node *)stalloc(sizeof (struct nfile)); - if (c == '>') { - np->nfile.fd = 1; - c = pgetc(); - if (c == '>') - np->type = NAPPEND; - else if (c == '|') - np->type = NCLOBBER; - else if (c == '&') - np->type = NTOFD; - else { - np->type = NTO; - pungetc(); - } - } else { /* c == '<' */ - np->nfile.fd = 0; - switch (c = pgetc()) { - case '<': - if (sizeof (struct nfile) != sizeof (struct nhere)) { - np = (union node *)stalloc(sizeof (struct nhere)); - np->nfile.fd = 0; - } - np->type = NHERE; - heredoc = (struct heredoc *)stalloc(sizeof (struct heredoc)); - heredoc->here = np; - if ((c = pgetc()) == '-') { - heredoc->striptabs = 1; - } else { - heredoc->striptabs = 0; - pungetc(); - } - break; +static void +popfile(void) +{ + struct parsefile *pf = parsefile; - case '&': - np->type = NFROMFD; - break; + INT_OFF; + if (pf->fd >= 0) + close(pf->fd); + free(pf->buf); + while (pf->strpush) + popstring(); + parsefile = pf->prev; + free(pf); + parsenleft = parsefile->nleft; + parselleft = parsefile->lleft; + parsenextc = parsefile->nextc; + plinno = parsefile->linno; + INT_ON; +} - case '>': - np->type = NFROMTO; - break; +/* + * Return to top level. + */ +static void +popallfiles(void) +{ + while (parsefile != &basepf) + popfile(); +} - default: - np->type = NFROM; - pungetc(); - break; - } +/* + * Close the file(s) that the shell is reading commands from. Called + * after a fork is done. + */ +static void +closescript(void) +{ + popallfiles(); + if (parsefile->fd > 0) { + close(parsefile->fd); + parsefile->fd = 0; } - if (fd != '\0') - np->nfile.fd = digit_val(fd); - redirnode = np; - goto parseredir_return; } - /* - * Parse a substitution. At this point, we have read the dollar sign - * and nothing else. + * Like setinputfile, but takes an open file descriptor. Call this with + * interrupts off. */ +static void +setinputfd(int fd, int push) +{ + close_on_exec_on(fd); + if (push) { + pushfile(); + parsefile->buf = 0; + } + parsefile->fd = fd; + if (parsefile->buf == NULL) + parsefile->buf = ckmalloc(IBUFSIZ); + parselleft = parsenleft = 0; + plinno = 1; +} -parsesub: { - int subtype; - int typeloc; - int flags; - char *p; - static const char types[] = "}-+?="; - - c = pgetc(); - if ( - c <= PEOA_OR_PEOF || - (c != '(' && c != '{' && !is_name(c) && !is_special(c)) - ) { - USTPUTC('$', out); - pungetc(); - } else if (c == '(') { /* $(command) or $((arith)) */ - if (pgetc() == '(') { -#ifdef CONFIG_ASH_MATH_SUPPORT - PARSEARITH(); -#else - synerror("We unsupport $((arith))"); -#endif - } else { - pungetc(); - PARSEBACKQNEW(); - } - } else { - USTPUTC(CTLVAR, out); - typeloc = out - (char *)stackblock(); - USTPUTC(VSNORMAL, out); - subtype = VSNORMAL; - if (c == '{') { - c = pgetc(); - if (c == '#') { - if ((c = pgetc()) == '}') - c = '#'; - else - subtype = VSLENGTH; - } - else - subtype = 0; - } - if (c > PEOA_OR_PEOF && is_name(c)) { - do { - STPUTC(c, out); - c = pgetc(); - } while (c > PEOA_OR_PEOF && is_in_name(c)); - } else if (is_digit(c)) { - do { - STPUTC(c, out); - c = pgetc(); - } while (is_digit(c)); - } - else if (is_special(c)) { - USTPUTC(c, out); - c = pgetc(); - } - else -badsub: synerror("Bad substitution"); +/* + * Set the input to take input from a file. If push is set, push the + * old input onto the stack first. + */ +static int +setinputfile(const char *fname, int flags) +{ + int fd; + int fd2; - STPUTC('=', out); - flags = 0; - if (subtype == 0) { - switch (c) { - case ':': - flags = VSNUL; - c = pgetc(); - /*FALLTHROUGH*/ - default: - p = strchr(types, c); - if (p == NULL) - goto badsub; - subtype = p - types + VSNORMAL; - break; - case '%': - case '#': - { - int cc = c; - subtype = c == '#' ? VSTRIMLEFT : - VSTRIMRIGHT; - c = pgetc(); - if (c == cc) - subtype++; - else - pungetc(); - break; - } - } - } else { - pungetc(); - } - if (dblquote || arinest) - flags |= VSQUOTE; - *((char *)stackblock() + typeloc) = subtype | flags; - if (subtype != VSNORMAL) { - varnest++; - if (dblquote || arinest) { - dqvarnest++; - } - } + INT_OFF; + fd = open(fname, O_RDONLY); + if (fd < 0) { + if (flags & INPUT_NOFILE_OK) + goto out; + ash_msg_and_raise_error("can't open %s", fname); } - goto parsesub_return; + if (fd < 10) { + fd2 = copyfd(fd, 10); + close(fd); + if (fd2 < 0) + ash_msg_and_raise_error("out of file descriptors"); + fd = fd2; + } + setinputfd(fd, flags & INPUT_PUSH_FILE); + out: + INT_ON; + return fd; +} + +/* + * Like setinputfile, but takes input from a string. + */ +static void +setinputstring(char *string) +{ + INT_OFF; + pushfile(); + parsenextc = string; + parsenleft = strlen(string); + parsefile->buf = NULL; + plinno = 1; + INT_ON; } -/* - * Called to parse command substitutions. Newstyle is set if the command - * is enclosed inside $(...); nlpp is a pointer to the head of the linked - * list of commands (passed by reference), and savelen is the number of - * characters on the top of the stack which must be preserved. +/* ============ mail.c + * + * Routines to check for mail. */ -parsebackq: { - struct nodelist **nlpp; - int savepbq; - union node *n; - char *volatile str; - struct jmploc jmploc; - struct jmploc *volatile savehandler; - size_t savelen; - int saveprompt = 0; -#ifdef __GNUC__ - (void) &saveprompt; -#endif - - savepbq = parsebackquote; - if (setjmp(jmploc.loc)) { - if (str) - ckfree(str); - parsebackquote = 0; - handler = savehandler; - longjmp(handler->loc, 1); - } - INTOFF; - str = NULL; - savelen = out - (char *)stackblock(); - if (savelen > 0) { - str = ckmalloc(savelen); - memcpy(str, stackblock(), savelen); - } - savehandler = handler; - handler = &jmploc; - INTON; - if (oldstyle) { - /* We must read until the closing backquote, giving special - treatment to some slashes, and then push the string and - reread it as input, interpreting it normally. */ - char *pout; - int pc; - size_t psavelen; - char *pstr; +#if ENABLE_ASH_MAIL +#define MAXMBOXES 10 - STARTSTACKSTR(pout); - for (;;) { - if (needprompt) { - setprompt(2); - } - switch (pc = pgetc()) { - case '`': - goto done; +/* times of mailboxes */ +static time_t mailtime[MAXMBOXES]; +/* Set if MAIL or MAILPATH is changed. */ +static smallint mail_var_path_changed; - case '\\': - if ((pc = pgetc()) == '\n') { - plinno++; - if (doprompt) - setprompt(2); - /* - * If eating a newline, avoid putting - * the newline into the new character - * stream (via the STPUTC after the - * switch). - */ - continue; - } - if (pc != '\\' && pc != '`' && pc != '$' - && (!dblquote || pc != '"')) - STPUTC('\\', pout); - if (pc > PEOA_OR_PEOF) { - break; - } - /* fall through */ +/* + * Print appropriate message(s) if mail has arrived. + * If mail_var_path_changed is set, + * then the value of MAIL has mail_var_path_changed, + * so we just update the values. + */ +static void +chkmail(void) +{ + const char *mpath; + char *p; + char *q; + time_t *mtp; + struct stackmark smark; + struct stat statb; - case PEOF: -#ifdef CONFIG_ASH_ALIAS - case PEOA: + setstackmark(&smark); + mpath = mpathset() ? mpathval() : mailval(); + for (mtp = mailtime; mtp < mailtime + MAXMBOXES; mtp++) { + p = padvance(&mpath, nullstr); + if (p == NULL) + break; + if (*p == '\0') + continue; + for (q = p; *q; q++); +#if DEBUG + if (q[-1] != '/') + abort(); #endif - startlinno = plinno; - synerror("EOF in backquote substitution"); - - case '\n': - plinno++; - needprompt = doprompt; - break; - - default: - break; - } - STPUTC(pc, pout); + q[-1] = '\0'; /* delete trailing '/' */ + if (stat(p, &statb) < 0) { + *mtp = 0; + continue; } -done: - STPUTC('\0', pout); - psavelen = pout - (char *)stackblock(); - if (psavelen > 0) { - pstr = grabstackstr(pout); - setinputstring(pstr); + if (!mail_var_path_changed && statb.st_mtime != *mtp) { + fprintf( + stderr, snlfmt, + pathopt ? pathopt : "you have mail" + ); } + *mtp = statb.st_mtime; } - nlpp = &bqlist; - while (*nlpp) - nlpp = &(*nlpp)->next; - *nlpp = (struct nodelist *)stalloc(sizeof (struct nodelist)); - (*nlpp)->next = NULL; - parsebackquote = oldstyle; + mail_var_path_changed = 0; + popstackmark(&smark); +} - if (oldstyle) { - saveprompt = doprompt; - doprompt = 0; - } +static void +changemail(const char *val) +{ + mail_var_path_changed = 1; +} - n = list(2); +#endif /* ASH_MAIL */ - if (oldstyle) - doprompt = saveprompt; - else { - if (readtoken() != TRP) - synexpect(TRP); - } - (*nlpp)->n = n; - if (oldstyle) { - /* - * Start reading from old file again, ignoring any pushed back - * tokens left from the backquote parsing - */ - popfile(); - tokpushback = 0; - } - while (stackblocksize() <= savelen) - growstackblock(); - STARTSTACKSTR(out); - if (str) { - memcpy(out, str, savelen); - STADJUST(savelen, out); - INTOFF; - ckfree(str); - str = NULL; - INTON; +/* ============ ??? */ + +/* + * Set the shell parameters. + */ +static void +setparam(char **argv) +{ + char **newparam; + char **ap; + int nparam; + + for (nparam = 0; argv[nparam]; nparam++); + ap = newparam = ckmalloc((nparam + 1) * sizeof(*ap)); + while (*argv) { + *ap++ = ckstrdup(*argv++); } - parsebackquote = savepbq; - handler = savehandler; - if (arinest || dblquote) - USTPUTC(CTLBACKQ | CTLQUOTE, out); - else - USTPUTC(CTLBACKQ, out); - if (oldstyle) - goto parsebackq_oldreturn; - else - goto parsebackq_newreturn; + *ap = NULL; + freeparam(&shellparam); + shellparam.malloc = 1; + shellparam.nparam = nparam; + shellparam.p = newparam; +#if ENABLE_ASH_GETOPTS + shellparam.optind = 1; + shellparam.optoff = -1; +#endif } -#ifdef CONFIG_ASH_MATH_SUPPORT /* - * Parse an arithmetic expansion (indicate start of one and set state) + * Process shell options. The global variable argptr contains a pointer + * to the argument list; we advance it past the options. */ -parsearith: { +static void +minus_o(char *name, int val) +{ + int i; - if (++arinest == 1) { - prevsyntax = syntax; - syntax = ARISYNTAX; - USTPUTC(CTLARI, out); - if (dblquote) - USTPUTC('"',out); - else - USTPUTC(' ',out); - } else { - /* - * we collapse embedded arithmetic expansion to - * parenthesis, which should be equivalent - */ - USTPUTC('(', out); + if (name) { + for (i = 0; i < NOPTS; i++) { + if (strcmp(name, optnames(i)) == 0) { + optlist[i] = val; + return; + } + } + ash_msg_and_raise_error("illegal option -o %s", name); + } + out1str("Current option settings\n"); + for (i = 0; i < NOPTS; i++) + out1fmt("%-16s%s\n", optnames(i), + optlist[i] ? "on" : "off"); +} +static void +setoption(int flag, int val) +{ + int i; + + for (i = 0; i < NOPTS; i++) { + if (optletters(i) == flag) { + optlist[i] = val; + return; + } + } + ash_msg_and_raise_error("illegal option -%c", flag); + /* NOTREACHED */ +} +static void +options(int cmdline) +{ + char *p; + int val; + int c; + + if (cmdline) + minusc = NULL; + while ((p = *argptr) != NULL) { + c = *p++; + if (c != '-' && c != '+') + break; + argptr++; + val = 0; /* val = 0 if c == '+' */ + if (c == '-') { + val = 1; + if (p[0] == '\0' || LONE_DASH(p)) { + if (!cmdline) { + /* "-" means turn off -x and -v */ + if (p[0] == '\0') + xflag = vflag = 0; + /* "--" means reset params */ + else if (*argptr == NULL) + setparam(argptr); + } + break; /* "-" or "--" terminates options */ + } + } + /* first char was + or - */ + while ((c = *p++) != '\0') { + /* bash 3.2 indeed handles -c CMD and +c CMD the same */ + if (c == 'c' && cmdline) { + minusc = p; /* command is after shell args */ + } else if (c == 'o') { + minus_o(*argptr, val); + if (*argptr) + argptr++; + } else if (cmdline && (c == 'l')) { /* -l or +l == --login */ + isloginsh = 1; + /* bash does not accept +-login, we also won't */ + } else if (cmdline && val && (c == '-')) { /* long options */ + if (strcmp(p, "login") == 0) + isloginsh = 1; + break; + } else { + setoption(c, val); + } + } } - goto parsearith_return; } -#endif - -} /* end of readtoken */ - - /* - * Returns true if the text contains nothing to expand (no dollar signs - * or backquotes). + * The shift builtin command. */ - static int -noexpand(char *text) +shiftcmd(int argc, char **argv) { - char *p; - char c; + int n; + char **ap1, **ap2; - p = text; - while ((c = *p++) != '\0') { - if (c == CTLQUOTEMARK) - continue; - if (c == CTLESC) - p++; - else if (SIT(c, BASESYNTAX) == CCTL) - return 0; + n = 1; + if (argc > 1) + n = number(argv[1]); + if (n > shellparam.nparam) + ash_msg_and_raise_error("can't shift that many"); + INT_OFF; + shellparam.nparam -= n; + for (ap1 = shellparam.p; --n >= 0; ap1++) { + if (shellparam.malloc) + free(*ap1); } - return 1; + ap2 = shellparam.p; + while ((*ap2++ = *ap1++) != NULL); +#if ENABLE_ASH_GETOPTS + shellparam.optind = 1; + shellparam.optoff = -1; +#endif + INT_ON; + return 0; } - /* - * Return of a legal variable name (a letter or underscore followed by zero or - * more letters, underscores, and digits). + * POSIX requires that 'set' (but not export or readonly) output the + * variables in lexicographic order - by the locale's collating order (sigh). + * Maybe we could keep them in an ordered balanced binary tree + * instead of hashed lists. + * For now just roll 'em through qsort for printing... */ - -static char * -endofname(const char *name) +static int +showvars(const char *sep_prefix, int on, int off) { - char *p; - - p = (char *) name; - if (! is_name(*p)) - return p; - while (*++p) { - if (! is_in_name(*p)) - break; - } - return p; -} - + const char *sep; + char **ep, **epend; -/* - * Called when an unexpected token is read during the parse. The argument - * is the token that is expected, or -1 if more than one type of token can - * occur at this point. - */ + ep = listvars(on, off, &epend); + qsort(ep, epend - ep, sizeof(char *), vpcmp); -static void synexpect(int token) -{ - char msg[64]; - int l; + sep = *sep_prefix ? " " : sep_prefix; - l = sprintf(msg, "%s unexpected", tokname(lasttoken)); - if (token >= 0) - sprintf(msg + l, " (expecting %s)", tokname(token)); - synerror(msg); - /* NOTREACHED */ -} + for (; ep < epend; ep++) { + const char *p; + const char *q; -static void -synerror(const char *msg) -{ - sh_error("Syntax error: %s", msg); - /* NOTREACHED */ + p = strchrnul(*ep, '='); + q = nullstr; + if (*p) + q = single_quote(++p); + out1fmt("%s%s%.*s%s\n", sep_prefix, sep, (int)(p - *ep), *ep, q); + } + return 0; } - /* - * called by editline -- any expansions to the prompt - * should be added here. + * The set command builtin. */ - -#ifdef CONFIG_ASH_EXPAND_PRMT -static const char * -expandstr(const char *ps) +static int +setcmd(int argc, char **argv) { - union node n; - - /* XXX Fix (char *) cast. */ - setinputstring((char *)ps); - readtoken1(pgetc(), DQSYNTAX, nullstr, 0); - popfile(); - - n.narg.type = NARG; - n.narg.next = NULL; - n.narg.text = wordtext; - n.narg.backquote = backquotelist; - - expandarg(&n, NULL, 0); - return stackblock(); + if (argc == 1) + return showvars(nullstr, 0, VUNSET); + INT_OFF; + options(0); + optschanged(); + if (*argptr != NULL) { + setparam(argptr); + } + INT_ON; + return 0; } -#endif -static void setprompt(int whichprompt) +#if ENABLE_ASH_RANDOM_SUPPORT +/* Roughly copied from bash.. */ +static void +change_random(const char *value) { - const char *prompt; -#ifdef CONFIG_ASH_EXPAND_PRMT - struct stackmark smark; -#endif - - needprompt = 0; + if (value == NULL) { + /* "get", generate */ + char buf[16]; - switch (whichprompt) { - case 1: - prompt = ps1val(); - break; - case 2: - prompt = ps2val(); - break; - default: /* 0 */ - prompt = nullstr; + rseed = rseed * 1103515245 + 12345; + sprintf(buf, "%d", (unsigned int)((rseed & 32767))); + /* set without recursion */ + setvar(vrandom.text, buf, VNOFUNC); + vrandom.flags &= ~VNOFUNC; + } else { + /* set/reset */ + rseed = strtoul(value, (char **)NULL, 10); } -#ifdef CONFIG_ASH_EXPAND_PRMT - setstackmark(&smark); - stalloc(stackblocksize()); -#endif - putprompt(expandstr(prompt)); -#ifdef CONFIG_ASH_EXPAND_PRMT - popstackmark(&smark); -#endif } - - -static const char *const *findkwd(const char *s) -{ - return bsearch(s, tokname_array + KWDOFFSET, - (sizeof(tokname_array) / sizeof(const char *)) - KWDOFFSET, - sizeof(const char *), pstrcmp); -} - -/* redir.c */ - -/* - * Code for dealing with input/output redirection. - */ - -#define EMPTY -2 /* marks an unused slot in redirtab */ -#ifndef PIPE_BUF -# define PIPESIZE 4096 /* amount of buffering in a pipe */ -#else -# define PIPESIZE PIPE_BUF #endif -/* - * Open a file in noclobber mode. - * The code was copied from bash. - */ -static int noclobberopen(const char *fname) +#if ENABLE_ASH_GETOPTS +static int +getopts(char *optstr, char *optvar, char **optfirst, int *param_optind, int *optoff) { - int r, fd; - struct stat finfo, finfo2; - - /* - * If the file exists and is a regular file, return an error - * immediately. - */ - r = stat(fname, &finfo); - if (r == 0 && S_ISREG(finfo.st_mode)) { - errno = EEXIST; - return -1; - } - - /* - * If the file was not present (r != 0), make sure we open it - * exclusively so that if it is created before we open it, our open - * will fail. Make sure that we do not truncate an existing file. - * Note that we don't turn on O_EXCL unless the stat failed -- if the - * file was not a regular file, we leave O_EXCL off. - */ - if (r != 0) - return open(fname, O_WRONLY|O_CREAT|O_EXCL, 0666); - fd = open(fname, O_WRONLY|O_CREAT, 0666); - - /* If the open failed, return the file descriptor right away. */ - if (fd < 0) - return fd; - - /* - * OK, the open succeeded, but the file may have been changed from a - * non-regular file to a regular file between the stat and the open. - * We are assuming that the O_EXCL open handles the case where FILENAME - * did not exist and is symlinked to an existing file between the stat - * and open. - */ - - /* - * If we can open it and fstat the file descriptor, and neither check - * revealed that it was a regular file, and the file has not been - * replaced, return the file descriptor. - */ - if (fstat(fd, &finfo2) == 0 && !S_ISREG(finfo2.st_mode) && - finfo.st_dev == finfo2.st_dev && finfo.st_ino == finfo2.st_ino) - return fd; - - /* The file has been replaced. badness. */ - close(fd); - errno = EEXIST; - return -1; -} + char *p, *q; + char c = '?'; + int done = 0; + int err = 0; + char s[12]; + char **optnext; -/* - * Handle here documents. Normally we fork off a process to write the - * data to a pipe. If the document is short, we can stuff the data in - * the pipe without forking. - */ + if (*param_optind < 1) + return 1; + optnext = optfirst + *param_optind - 1; -static int openhere(union node *redir) -{ - int pip[2]; - size_t len = 0; + if (*param_optind <= 1 || *optoff < 0 || strlen(optnext[-1]) < *optoff) + p = NULL; + else + p = optnext[-1] + *optoff; + if (p == NULL || *p == '\0') { + /* Current word is done, advance */ + p = *optnext; + if (p == NULL || *p != '-' || *++p == '\0') { + atend: + p = NULL; + done = 1; + goto out; + } + optnext++; + if (LONE_DASH(p)) /* check for "--" */ + goto atend; + } - if (pipe(pip) < 0) - sh_error("Pipe call failed"); - if (redir->type == NHERE) { - len = strlen(redir->nhere.doc->narg.text); - if (len <= PIPESIZE) { - full_write(pip[1], redir->nhere.doc->narg.text, len); + c = *p++; + for (q = optstr; *q != c; ) { + if (*q == '\0') { + if (optstr[0] == ':') { + s[0] = c; + s[1] = '\0'; + err |= setvarsafe("OPTARG", s, 0); + } else { + fprintf(stderr, "Illegal option -%c\n", c); + unsetvar("OPTARG"); + } + c = '?'; goto out; } + if (*++q == ':') + q++; } - if (forkshell((struct job *)NULL, (union node *)NULL, FORK_NOJOB) == 0) { - close(pip[0]); - signal(SIGINT, SIG_IGN); - signal(SIGQUIT, SIG_IGN); - signal(SIGHUP, SIG_IGN); -#ifdef SIGTSTP - signal(SIGTSTP, SIG_IGN); -#endif - signal(SIGPIPE, SIG_DFL); - if (redir->type == NHERE) - full_write(pip[1], redir->nhere.doc->narg.text, len); - else - expandhere(redir->nhere.doc, pip[1]); - _exit(0); + + if (*++q == ':') { + if (*p == '\0' && (p = *optnext) == NULL) { + if (optstr[0] == ':') { + s[0] = c; + s[1] = '\0'; + err |= setvarsafe("OPTARG", s, 0); + c = ':'; + } else { + fprintf(stderr, "No arg for -%c option\n", c); + unsetvar("OPTARG"); + c = '?'; + } + goto out; + } + + if (p == *optnext) + optnext++; + err |= setvarsafe("OPTARG", p, 0); + p = NULL; + } else + err |= setvarsafe("OPTARG", nullstr, 0); + out: + *optoff = p ? p - *(optnext - 1) : -1; + *param_optind = optnext - optfirst + 1; + fmtstr(s, sizeof(s), "%d", *param_optind); + err |= setvarsafe("OPTIND", s, VNOFUNC); + s[0] = c; + s[1] = '\0'; + err |= setvarsafe(optvar, s, 0); + if (err) { + *param_optind = 1; + *optoff = -1; + flush_stdout_stderr(); + raise_exception(EXERROR); } -out: - close(pip[1]); - return pip[0]; + return done; } +/* + * The getopts builtin. Shellparam.optnext points to the next argument + * to be processed. Shellparam.optptr points to the next character to + * be processed in the current argument. If shellparam.optnext is NULL, + * then it's the first time getopts has been called. + */ static int -openredirect(union node *redir) +getoptscmd(int argc, char **argv) { - char *fname; - int f; + char **optbase; - switch (redir->nfile.type) { - case NFROM: - fname = redir->nfile.expfname; - if ((f = open(fname, O_RDONLY)) < 0) - goto eopen; - break; - case NFROMTO: - fname = redir->nfile.expfname; - if ((f = open(fname, O_RDWR|O_CREAT|O_TRUNC, 0666)) < 0) - goto ecreate; - break; - case NTO: - /* Take care of noclobber mode. */ - if (Cflag) { - fname = redir->nfile.expfname; - if ((f = noclobberopen(fname)) < 0) - goto ecreate; - break; + if (argc < 3) + ash_msg_and_raise_error("usage: getopts optstring var [arg]"); + if (argc == 3) { + optbase = shellparam.p; + if (shellparam.optind > shellparam.nparam + 1) { + shellparam.optind = 1; + shellparam.optoff = -1; + } + } else { + optbase = &argv[3]; + if (shellparam.optind > argc - 2) { + shellparam.optind = 1; + shellparam.optoff = -1; } - /* FALLTHROUGH */ - case NCLOBBER: - fname = redir->nfile.expfname; - if ((f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666)) < 0) - goto ecreate; - break; - case NAPPEND: - fname = redir->nfile.expfname; - if ((f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666)) < 0) - goto ecreate; - break; - default: -#if DEBUG - abort(); -#endif - /* Fall through to eliminate warning. */ - case NTOFD: - case NFROMFD: - f = -1; - break; - case NHERE: - case NXHERE: - f = openhere(redir); - break; } - return f; -ecreate: - sh_error("cannot create %s: %s", fname, errmsg(errno, E_CREAT)); -eopen: - sh_error("cannot open %s: %s", fname, errmsg(errno, E_OPEN)); + return getopts(argv[1], argv[2], optbase, &shellparam.optind, + &shellparam.optoff); } +#endif /* ASH_GETOPTS */ -static void dupredirect(union node *redir, int f) -{ - int fd = redir->nfile.fd; - if (redir->nfile.type == NTOFD || redir->nfile.type == NFROMFD) { - if (redir->ndup.dupfd >= 0) { /* if not ">&-" */ - copyfd(redir->ndup.dupfd, fd); - } - return; - } +/* ============ Shell parser */ - if (f != fd) { - copyfd(f, fd); - close(f); - } - return; +/* + * NEOF is returned by parsecmd when it encounters an end of file. It + * must be distinct from NULL, so we use the address of a variable that + * happens to be handy. + */ +static smallint tokpushback; /* last token pushed back */ +#define NEOF ((union node *)&tokpushback) +static smallint parsebackquote; /* nonzero if we are inside backquotes */ +static int lasttoken; /* last token read */ +static char *wordtext; /* text of last word returned by readtoken */ +static struct nodelist *backquotelist; +static union node *redirnode; +static struct heredoc *heredoc; +static smallint quoteflag; /* set if (part of) last token was quoted */ + +static void raise_error_syntax(const char *) ATTRIBUTE_NORETURN; +static void +raise_error_syntax(const char *msg) +{ + ash_msg_and_raise_error("syntax error: %s", msg); + /* NOTREACHED */ } /* - * Process a list of redirection commands. If the REDIR_PUSH flag is set, - * old file descriptors are stashed away so that the redirection can be - * undone by calling popredir. If the REDIR_BACKQ flag is set, then the - * standard output, and the standard error if it becomes a duplicate of - * stdout, is saved in memory. + * Called when an unexpected token is read during the parse. The argument + * is the token that is expected, or -1 if more than one type of token can + * occur at this point. */ - +static void raise_error_unexpected_syntax(int) ATTRIBUTE_NORETURN; static void -redirect(union node *redir, int flags) +raise_error_unexpected_syntax(int token) { - union node *n; - struct redirtab *sv; - int i; - int fd; - int newfd; - int *p; - nullredirs++; - if (!redir) { - return; - } - sv = NULL; - INTOFF; - if (flags & REDIR_PUSH) { - struct redirtab *q; - q = ckmalloc(sizeof (struct redirtab)); - q->next = redirlist; - redirlist = q; - q->nullredirs = nullredirs - 1; - for (i = 0 ; i < 10 ; i++) - q->renamed[i] = EMPTY; - nullredirs = 0; - sv = q; - } - n = redir; - do { - fd = n->nfile.fd; - if ((n->nfile.type == NTOFD || n->nfile.type == NFROMFD) && - n->ndup.dupfd == fd) - continue; /* redirect from/to same file descriptor */ + char msg[64]; + int l; - newfd = openredirect(n); - if (fd == newfd) - continue; - if (sv && *(p = &sv->renamed[fd]) == EMPTY) { - i = fcntl(fd, F_DUPFD, 10); + l = sprintf(msg, "%s unexpected", tokname(lasttoken)); + if (token >= 0) + sprintf(msg + l, " (expecting %s)", tokname(token)); + raise_error_syntax(msg); + /* NOTREACHED */ +} - if (i == -1) { - i = errno; - if (i != EBADF) { - close(newfd); - errno = i; - sh_error("%d: %m", fd); - /* NOTREACHED */ +#define EOFMARKLEN 79 + +struct heredoc { + struct heredoc *next; /* next here document in list */ + union node *here; /* redirection node */ + char *eofmark; /* string indicating end of input */ + int striptabs; /* if set, strip leading tabs */ +}; + +static struct heredoc *heredoclist; /* list of here documents to read */ + +/* parsing is heavily cross-recursive, need these forward decls */ +static union node *andor(void); +static union node *pipeline(void); +static union node *parse_command(void); +static void parseheredoc(void); +static char peektoken(void); +static int readtoken(void); + +static union node * +list(int nlflag) +{ + union node *n1, *n2, *n3; + int tok; + + checkkwd = CHKNL | CHKKWD | CHKALIAS; + if (nlflag == 2 && peektoken()) + return NULL; + n1 = NULL; + for (;;) { + n2 = andor(); + tok = readtoken(); + if (tok == TBACKGND) { + if (n2->type == NPIPE) { + n2->npipe.backgnd = 1; + } else { + if (n2->type != NREDIR) { + n3 = stalloc(sizeof(struct nredir)); + n3->nredir.n = n2; + n3->nredir.redirect = NULL; + n2 = n3; } + n2->type = NBACKGND; + } + } + if (n1 == NULL) { + n1 = n2; + } else { + n3 = stalloc(sizeof(struct nbinary)); + n3->type = NSEMI; + n3->nbinary.ch1 = n1; + n3->nbinary.ch2 = n2; + n1 = n3; + } + switch (tok) { + case TBACKGND: + case TSEMI: + tok = readtoken(); + /* fall through */ + case TNL: + if (tok == TNL) { + parseheredoc(); + if (nlflag == 1) + return n1; } else { - *p = i; - close(fd); + tokpushback = 1; } - } else { - close(fd); + checkkwd = CHKNL | CHKKWD | CHKALIAS; + if (peektoken()) + return n1; + break; + case TEOF: + if (heredoclist) + parseheredoc(); + else + pungetc(); /* push back EOF on input */ + return n1; + default: + if (nlflag == 1) + raise_error_unexpected_syntax(-1); + tokpushback = 1; + return n1; } - dupredirect(n, newfd); - } while ((n = n->nfile.next)); - INTON; - if (flags & REDIR_SAVEFD2 && sv && sv->renamed[2] >= 0) - preverrout_fd = sv->renamed[2]; + } } +static union node * +andor(void) +{ + union node *n1, *n2, *n3; + int t; -/* - * Undo the effects of the last redirection. - */ + n1 = pipeline(); + for (;;) { + t = readtoken(); + if (t == TAND) { + t = NAND; + } else if (t == TOR) { + t = NOR; + } else { + tokpushback = 1; + return n1; + } + checkkwd = CHKNL | CHKKWD | CHKALIAS; + n2 = pipeline(); + n3 = stalloc(sizeof(struct nbinary)); + n3->type = t; + n3->nbinary.ch1 = n1; + n3->nbinary.ch2 = n2; + n1 = n3; + } +} -void -popredir(int drop) +static union node * +pipeline(void) { - struct redirtab *rp; - int i; + union node *n1, *n2, *pipenode; + struct nodelist *lp, *prev; + int negate; - if (--nullredirs >= 0) - return; - INTOFF; - rp = redirlist; - for (i = 0 ; i < 10 ; i++) { - if (rp->renamed[i] != EMPTY) { - if (!drop) { - close(i); - copyfd(rp->renamed[i], i); - } - close(rp->renamed[i]); - } + negate = 0; + TRACE(("pipeline: entered\n")); + if (readtoken() == TNOT) { + negate = !negate; + checkkwd = CHKKWD | CHKALIAS; + } else + tokpushback = 1; + n1 = parse_command(); + if (readtoken() == TPIPE) { + pipenode = stalloc(sizeof(struct npipe)); + pipenode->type = NPIPE; + pipenode->npipe.backgnd = 0; + lp = stalloc(sizeof(struct nodelist)); + pipenode->npipe.cmdlist = lp; + lp->n = n1; + do { + prev = lp; + lp = stalloc(sizeof(struct nodelist)); + checkkwd = CHKNL | CHKKWD | CHKALIAS; + lp->n = parse_command(); + prev->next = lp; + } while (readtoken() == TPIPE); + lp->next = NULL; + n1 = pipenode; } - redirlist = rp->next; - nullredirs = rp->nullredirs; - ckfree(rp); - INTON; + tokpushback = 1; + if (negate) { + n2 = stalloc(sizeof(struct nnot)); + n2->type = NNOT; + n2->nnot.com = n1; + return n2; + } + return n1; } -/* - * Undo all redirections. Called on error or interrupt. - */ +static union node * +makename(void) +{ + union node *n; -/* - * Discard all saved file descriptors. - */ + n = stalloc(sizeof(struct narg)); + n->type = NARG; + n->narg.next = NULL; + n->narg.text = wordtext; + n->narg.backquote = backquotelist; + return n; +} -void -clearredir(int drop) +static void +fixredir(union node *n, const char *text, int err) { - for (;;) { - nullredirs = 0; - if (!redirlist) - break; - popredir(drop); + TRACE(("Fix redir %s %d\n", text, err)); + if (!err) + n->ndup.vname = NULL; + + if (isdigit(text[0]) && text[1] == '\0') + n->ndup.dupfd = text[0] - '0'; + else if (LONE_DASH(text)) + n->ndup.dupfd = -1; + else { + if (err) + raise_error_syntax("Bad fd number"); + n->ndup.vname = makename(); } } - /* - * Copy a file descriptor to be >= to. Returns -1 - * if the source file descriptor is closed, EMPTY if there are no unused - * file descriptors left. + * Returns true if the text contains nothing to expand (no dollar signs + * or backquotes). */ - -int -copyfd(int from, int to) +static int +noexpand(char *text) { - int newfd; + char *p; + char c; - newfd = fcntl(from, F_DUPFD, to); - if (newfd < 0) { - if (errno == EMFILE) - return EMPTY; - else - sh_error("%d: %m", from); + p = text; + while ((c = *p++) != '\0') { + if (c == CTLQUOTEMARK) + continue; + if (c == CTLESC) + p++; + else if (SIT(c, BASESYNTAX) == CCTL) + return 0; } - return newfd; + return 1; } - -int -redirectsafe(union node *redir, int flags) +static void +parsefname(void) { - int err; - volatile int saveint; - struct jmploc *volatile savehandler = handler; - struct jmploc jmploc; + union node *n = redirnode; - SAVEINT(saveint); - if (!(err = setjmp(jmploc.loc) * 2)) { - handler = &jmploc; - redirect(redir, flags); + if (readtoken() != TWORD) + raise_error_unexpected_syntax(-1); + if (n->type == NHERE) { + struct heredoc *here = heredoc; + struct heredoc *p; + int i; + + if (quoteflag == 0) + n->type = NXHERE; + TRACE(("Here document %d\n", n->type)); + if (!noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN) + raise_error_syntax("Illegal eof marker for << redirection"); + rmescapes(wordtext); + here->eofmark = wordtext; + here->next = NULL; + if (heredoclist == NULL) + heredoclist = here; + else { + for (p = heredoclist; p->next; p = p->next); + p->next = here; + } + } else if (n->type == NTOFD || n->type == NFROMFD) { + fixredir(n, wordtext, 0); + } else { + n->nfile.fname = makename(); } - handler = savehandler; - if (err && exception != EXERROR) - longjmp(handler->loc, 1); - RESTOREINT(saveint); - return err; } -/* show.c */ +static union node * +simplecmd(void) +{ + union node *args, **app; + union node *n = NULL; + union node *vars, **vpp; + union node **rpp, *redir; + int savecheckkwd; -#if DEBUG -static void shtree(union node *, int, char *, FILE*); -static void shcmd(union node *, FILE *); -static void sharg(union node *, FILE *); -static void indent(int, char *, FILE *); -static void trstring(char *); + args = NULL; + app = &args; + vars = NULL; + vpp = &vars; + redir = NULL; + rpp = &redir; + savecheckkwd = CHKALIAS; + for (;;) { + checkkwd = savecheckkwd; + switch (readtoken()) { + case TWORD: + n = stalloc(sizeof(struct narg)); + n->type = NARG; + n->narg.text = wordtext; + n->narg.backquote = backquotelist; + if (savecheckkwd && isassignment(wordtext)) { + *vpp = n; + vpp = &n->narg.next; + } else { + *app = n; + app = &n->narg.next; + savecheckkwd = 0; + } + break; + case TREDIR: + *rpp = n = redirnode; + rpp = &n->nfile.next; + parsefname(); /* read name of redirection file */ + break; + case TLP: + if (args && app == &args->narg.next + && !vars && !redir + ) { + struct builtincmd *bcmd; + const char *name; -void -showtree(union node *n) -{ - trputs("showtree called\n"); - shtree(n, 1, NULL, stdout); + /* We have a function */ + if (readtoken() != TRP) + raise_error_unexpected_syntax(TRP); + name = n->narg.text; + if (!goodname(name) + || ((bcmd = find_builtin(name)) && IS_BUILTIN_SPECIAL(bcmd)) + ) { + raise_error_syntax("Bad function name"); + } + n->type = NDEFUN; + checkkwd = CHKNL | CHKKWD | CHKALIAS; + n->narg.next = parse_command(); + return n; + } + /* fall through */ + default: + tokpushback = 1; + goto out; + } + } + out: + *app = NULL; + *vpp = NULL; + *rpp = NULL; + n = stalloc(sizeof(struct ncmd)); + n->type = NCMD; + n->ncmd.args = args; + n->ncmd.assign = vars; + n->ncmd.redirect = redir; + return n; } - -static void -shtree(union node *n, int ind, char *pfx, FILE *fp) +static union node * +parse_command(void) { - struct nodelist *lp; - const char *s; + union node *n1, *n2; + union node *ap, **app; + union node *cp, **cpp; + union node *redir, **rpp; + union node **rpp2; + int t; - if (n == NULL) - return; + redir = NULL; + rpp2 = &redir; - indent(ind, pfx, fp); - switch(n->type) { - case NSEMI: - s = "; "; - goto binop; - case NAND: - s = " && "; - goto binop; - case NOR: - s = " || "; -binop: - shtree(n->nbinary.ch1, ind, NULL, fp); - /* if (ind < 0) */ - fputs(s, fp); - shtree(n->nbinary.ch2, ind, NULL, fp); + switch (readtoken()) { + default: + raise_error_unexpected_syntax(-1); + /* NOTREACHED */ + case TIF: + n1 = stalloc(sizeof(struct nif)); + n1->type = NIF; + n1->nif.test = list(0); + if (readtoken() != TTHEN) + raise_error_unexpected_syntax(TTHEN); + n1->nif.ifpart = list(0); + n2 = n1; + while (readtoken() == TELIF) { + n2->nif.elsepart = stalloc(sizeof(struct nif)); + n2 = n2->nif.elsepart; + n2->type = NIF; + n2->nif.test = list(0); + if (readtoken() != TTHEN) + raise_error_unexpected_syntax(TTHEN); + n2->nif.ifpart = list(0); + } + if (lasttoken == TELSE) + n2->nif.elsepart = list(0); + else { + n2->nif.elsepart = NULL; + tokpushback = 1; + } + t = TFI; break; - case NCMD: - shcmd(n, fp); - if (ind >= 0) - putc('\n', fp); + case TWHILE: + case TUNTIL: { + int got; + n1 = stalloc(sizeof(struct nbinary)); + n1->type = (lasttoken == TWHILE) ? NWHILE : NUNTIL; + n1->nbinary.ch1 = list(0); + got = readtoken(); + if (got != TDO) { + TRACE(("expecting DO got %s %s\n", tokname(got), + got == TWORD ? wordtext : "")); + raise_error_unexpected_syntax(TDO); + } + n1->nbinary.ch2 = list(0); + t = TDONE; break; - case NPIPE: - for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) { - shcmd(lp->n, fp); - if (lp->next) - fputs(" | ", fp); + } + case TFOR: + if (readtoken() != TWORD || quoteflag || ! goodname(wordtext)) + raise_error_syntax("Bad for loop variable"); + n1 = stalloc(sizeof(struct nfor)); + n1->type = NFOR; + n1->nfor.var = wordtext; + checkkwd = CHKKWD | CHKALIAS; + if (readtoken() == TIN) { + app = ≈ + while (readtoken() == TWORD) { + n2 = stalloc(sizeof(struct narg)); + n2->type = NARG; + n2->narg.text = wordtext; + n2->narg.backquote = backquotelist; + *app = n2; + app = &n2->narg.next; + } + *app = NULL; + n1->nfor.args = ap; + if (lasttoken != TNL && lasttoken != TSEMI) + raise_error_unexpected_syntax(-1); + } else { + n2 = stalloc(sizeof(struct narg)); + n2->type = NARG; + n2->narg.text = (char *)dolatstr; + n2->narg.backquote = NULL; + n2->narg.next = NULL; + n1->nfor.args = n2; + /* + * Newline or semicolon here is optional (but note + * that the original Bourne shell only allowed NL). + */ + if (lasttoken != TNL && lasttoken != TSEMI) + tokpushback = 1; } - if (n->npipe.backgnd) - fputs(" &", fp); - if (ind >= 0) - putc('\n', fp); + checkkwd = CHKNL | CHKKWD | CHKALIAS; + if (readtoken() != TDO) + raise_error_unexpected_syntax(TDO); + n1->nfor.body = list(0); + t = TDONE; break; - default: - fprintf(fp, "", n->type); - if (ind >= 0) - putc('\n', fp); + case TCASE: + n1 = stalloc(sizeof(struct ncase)); + n1->type = NCASE; + if (readtoken() != TWORD) + raise_error_unexpected_syntax(TWORD); + n1->ncase.expr = n2 = stalloc(sizeof(struct narg)); + n2->type = NARG; + n2->narg.text = wordtext; + n2->narg.backquote = backquotelist; + n2->narg.next = NULL; + do { + checkkwd = CHKKWD | CHKALIAS; + } while (readtoken() == TNL); + if (lasttoken != TIN) + raise_error_unexpected_syntax(TIN); + cpp = &n1->ncase.cases; + next_case: + checkkwd = CHKNL | CHKKWD; + t = readtoken(); + while (t != TESAC) { + if (lasttoken == TLP) + readtoken(); + *cpp = cp = stalloc(sizeof(struct nclist)); + cp->type = NCLIST; + app = &cp->nclist.pattern; + for (;;) { + *app = ap = stalloc(sizeof(struct narg)); + ap->type = NARG; + ap->narg.text = wordtext; + ap->narg.backquote = backquotelist; + if (readtoken() != TPIPE) + break; + app = &ap->narg.next; + readtoken(); + } + ap->narg.next = NULL; + if (lasttoken != TRP) + raise_error_unexpected_syntax(TRP); + cp->nclist.body = list(2); + + cpp = &cp->nclist.next; + + checkkwd = CHKNL | CHKKWD; + t = readtoken(); + if (t != TESAC) { + if (t != TENDCASE) + raise_error_unexpected_syntax(TENDCASE); + goto next_case; + } + } + *cpp = NULL; + goto redir; + case TLP: + n1 = stalloc(sizeof(struct nredir)); + n1->type = NSUBSHELL; + n1->nredir.n = list(0); + n1->nredir.redirect = NULL; + t = TRP; + break; + case TBEGIN: + n1 = list(0); + t = TEND; break; + case TWORD: + case TREDIR: + tokpushback = 1; + return simplecmd(); } -} + if (readtoken() != t) + raise_error_unexpected_syntax(t); -static void -shcmd(union node *cmd, FILE *fp) -{ - union node *np; - int first; - const char *s; - int dftfd; - - first = 1; - for (np = cmd->ncmd.args ; np ; np = np->narg.next) { - if (! first) - putchar(' '); - sharg(np, fp); - first = 0; + redir: + /* Now check for redirection which may follow command */ + checkkwd = CHKKWD | CHKALIAS; + rpp = rpp2; + while (readtoken() == TREDIR) { + *rpp = n2 = redirnode; + rpp = &n2->nfile.next; + parsefname(); } - for (np = cmd->ncmd.redirect ; np ; np = np->nfile.next) { - if (! first) - putchar(' '); - switch (np->nfile.type) { - case NTO: s = ">"; dftfd = 1; break; - case NCLOBBER: s = ">|"; dftfd = 1; break; - case NAPPEND: s = ">>"; dftfd = 1; break; - case NTOFD: s = ">&"; dftfd = 1; break; - case NFROM: s = "<"; dftfd = 0; break; - case NFROMFD: s = "<&"; dftfd = 0; break; - case NFROMTO: s = "<>"; dftfd = 0; break; - default: s = "*error*"; dftfd = 0; break; - } - if (np->nfile.fd != dftfd) - fprintf(fp, "%d", np->nfile.fd); - fputs(s, fp); - if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) { - fprintf(fp, "%d", np->ndup.dupfd); - } else { - sharg(np->nfile.fname, fp); + tokpushback = 1; + *rpp = NULL; + if (redir) { + if (n1->type != NSUBSHELL) { + n2 = stalloc(sizeof(struct nredir)); + n2->type = NREDIR; + n2->nredir.n = n1; + n1 = n2; } - first = 0; + n1->nredir.redirect = redir; } + return n1; } +/* + * If eofmark is NULL, read a word or a redirection symbol. If eofmark + * is not NULL, read a here document. In the latter case, eofmark is the + * word which marks the end of the document and striptabs is true if + * leading tabs should be stripped from the document. The argument firstc + * is the first character of the input token or document. + * + * Because C does not have internal subroutines, I have simulated them + * using goto's to implement the subroutine linkage. The following macros + * will run code that appears at the end of readtoken1. + */ +#define CHECKEND() {goto checkend; checkend_return:;} +#define PARSEREDIR() {goto parseredir; parseredir_return:;} +#define PARSESUB() {goto parsesub; parsesub_return:;} +#define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;} +#define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;} +#define PARSEARITH() {goto parsearith; parsearith_return:;} -static void -sharg(union node *arg, FILE *fp) +static int +readtoken1(int firstc, int syntax, char *eofmark, int striptabs) { - char *p; + /* NB: syntax parameter fits into smallint */ + int c = firstc; + char *out; + int len; + char line[EOFMARKLEN + 1]; struct nodelist *bqlist; - int subtype; - - if (arg->type != NARG) { - out1fmt("\n", arg->type); - abort(); - } - bqlist = arg->narg.backquote; - for (p = arg->narg.text ; *p ; p++) { - switch (*p) { - case CTLESC: - putc(*++p, fp); - break; - case CTLVAR: - putc('$', fp); - putc('{', fp); - subtype = *++p; - if (subtype == VSLENGTH) - putc('#', fp); + smallint quotef; + smallint dblquote; + smallint oldstyle; + smallint prevsyntax; /* syntax before arithmetic */ +#if ENABLE_ASH_EXPAND_PRMT + smallint pssyntax; /* we are expanding a prompt string */ +#endif + int varnest; /* levels of variables expansion */ + int arinest; /* levels of arithmetic expansion */ + int parenlevel; /* levels of parens in arithmetic */ + int dqvarnest; /* levels of variables expansion within double quotes */ - while (*p != '=') - putc(*p++, fp); - - if (subtype & VSNUL) - putc(':', fp); +#if __GNUC__ + /* Avoid longjmp clobbering */ + (void) &out; + (void) "ef; + (void) &dblquote; + (void) &varnest; + (void) &arinest; + (void) &parenlevel; + (void) &dqvarnest; + (void) &oldstyle; + (void) &prevsyntax; + (void) &syntax; +#endif + startlinno = plinno; + bqlist = NULL; + quotef = 0; + oldstyle = 0; + prevsyntax = 0; +#if ENABLE_ASH_EXPAND_PRMT + pssyntax = (syntax == PSSYNTAX); + if (pssyntax) + syntax = DQSYNTAX; +#endif + dblquote = (syntax == DQSYNTAX); + varnest = 0; + arinest = 0; + parenlevel = 0; + dqvarnest = 0; - switch (subtype & VSTYPE) { - case VSNORMAL: - putc('}', fp); + STARTSTACKSTR(out); + loop: { /* for each line, until end of word */ + CHECKEND(); /* set c to PEOF if at end of here document */ + for (;;) { /* until end of line or end of word */ + CHECKSTRSPACE(4, out); /* permit 4 calls to USTPUTC */ + switch (SIT(c, syntax)) { + case CNL: /* '\n' */ + if (syntax == BASESYNTAX) + goto endword; /* exit outer loop */ + USTPUTC(c, out); + plinno++; + if (doprompt) + setprompt(2); + c = pgetc(); + goto loop; /* continue outer loop */ + case CWORD: + USTPUTC(c, out); break; - case VSMINUS: - putc('-', fp); + case CCTL: + if (eofmark == NULL || dblquote) + USTPUTC(CTLESC, out); + USTPUTC(c, out); break; - case VSPLUS: - putc('+', fp); + case CBACK: /* backslash */ + c = pgetc2(); + if (c == PEOF) { + USTPUTC(CTLESC, out); + USTPUTC('\\', out); + pungetc(); + } else if (c == '\n') { + if (doprompt) + setprompt(2); + } else { +#if ENABLE_ASH_EXPAND_PRMT + if (c == '$' && pssyntax) { + USTPUTC(CTLESC, out); + USTPUTC('\\', out); + } +#endif + if (dblquote && + c != '\\' && c != '`' && + c != '$' && ( + c != '"' || + eofmark != NULL) + ) { + USTPUTC(CTLESC, out); + USTPUTC('\\', out); + } + if (SIT(c, SQSYNTAX) == CCTL) + USTPUTC(CTLESC, out); + USTPUTC(c, out); + quotef = 1; + } break; - case VSQUESTION: - putc('?', fp); + case CSQUOTE: + syntax = SQSYNTAX; + quotemark: + if (eofmark == NULL) { + USTPUTC(CTLQUOTEMARK, out); + } break; - case VSASSIGN: - putc('=', fp); + case CDQUOTE: + syntax = DQSYNTAX; + dblquote = 1; + goto quotemark; + case CENDQUOTE: + if (eofmark != NULL && arinest == 0 + && varnest == 0 + ) { + USTPUTC(c, out); + } else { + if (dqvarnest == 0) { + syntax = BASESYNTAX; + dblquote = 0; + } + quotef = 1; + goto quotemark; + } break; - case VSTRIMLEFT: - putc('#', fp); + case CVAR: /* '$' */ + PARSESUB(); /* parse substitution */ break; - case VSTRIMLEFTMAX: - putc('#', fp); - putc('#', fp); + case CENDVAR: /* '}' */ + if (varnest > 0) { + varnest--; + if (dqvarnest > 0) { + dqvarnest--; + } + USTPUTC(CTLENDVAR, out); + } else { + USTPUTC(c, out); + } break; - case VSTRIMRIGHT: - putc('%', fp); +#if ENABLE_ASH_MATH_SUPPORT + case CLP: /* '(' in arithmetic */ + parenlevel++; + USTPUTC(c, out); break; - case VSTRIMRIGHTMAX: - putc('%', fp); - putc('%', fp); + case CRP: /* ')' in arithmetic */ + if (parenlevel > 0) { + USTPUTC(c, out); + --parenlevel; + } else { + if (pgetc() == ')') { + if (--arinest == 0) { + USTPUTC(CTLENDARI, out); + syntax = prevsyntax; + dblquote = (syntax == DQSYNTAX); + } else + USTPUTC(')', out); + } else { + /* + * unbalanced parens + * (don't 2nd guess - no error) + */ + pungetc(); + USTPUTC(')', out); + } + } break; - case VSLENGTH: +#endif + case CBQUOTE: /* '`' */ + PARSEBACKQOLD(); + break; + case CENDFILE: + goto endword; /* exit outer loop */ + case CIGN: break; default: - out1fmt("", subtype); + if (varnest == 0) + goto endword; /* exit outer loop */ +#if ENABLE_ASH_ALIAS + if (c != PEOA) +#endif + USTPUTC(c, out); + + } + c = pgetc_macro(); + } + } + endword: +#if ENABLE_ASH_MATH_SUPPORT + if (syntax == ARISYNTAX) + raise_error_syntax("Missing '))'"); +#endif + if (syntax != BASESYNTAX && !parsebackquote && eofmark == NULL) + raise_error_syntax("Unterminated quoted string"); + if (varnest != 0) { + startlinno = plinno; + /* { */ + raise_error_syntax("Missing '}'"); + } + USTPUTC('\0', out); + len = out - (char *)stackblock(); + out = stackblock(); + if (eofmark == NULL) { + if ((c == '>' || c == '<') + && quotef == 0 + && len <= 2 + && (*out == '\0' || isdigit(*out))) { + PARSEREDIR(); + return lasttoken = TREDIR; + } else { + pungetc(); + } + } + quoteflag = quotef; + backquotelist = bqlist; + grabstackblock(len); + wordtext = out; + lasttoken = TWORD; + return lasttoken; +/* end of readtoken routine */ + +/* + * Check to see whether we are at the end of the here document. When this + * is called, c is set to the first character of the next input line. If + * we are at the end of the here document, this routine sets the c to PEOF. + */ +checkend: { + if (eofmark) { +#if ENABLE_ASH_ALIAS + if (c == PEOA) { + c = pgetc2(); + } +#endif + if (striptabs) { + while (c == '\t') { + c = pgetc2(); + } + } + if (c == *eofmark) { + if (pfgets(line, sizeof(line)) != NULL) { + char *p, *q; + + p = line; + for (q = eofmark + 1; *q && *p == *q; p++, q++); + if (*p == '\n' && *q == '\0') { + c = PEOF; + plinno++; + needprompt = doprompt; + } else { + pushstring(line, NULL); + } + } + } + } + goto checkend_return; +} + +/* + * Parse a redirection operator. The variable "out" points to a string + * specifying the fd to be redirected. The variable "c" contains the + * first character of the redirection operator. + */ +parseredir: { + char fd = *out; + union node *np; + + np = stalloc(sizeof(struct nfile)); + if (c == '>') { + np->nfile.fd = 1; + c = pgetc(); + if (c == '>') + np->type = NAPPEND; + else if (c == '|') + np->type = NCLOBBER; + else if (c == '&') + np->type = NTOFD; + else { + np->type = NTO; + pungetc(); + } + } else { /* c == '<' */ + np->nfile.fd = 0; + c = pgetc(); + switch (c) { + case '<': + if (sizeof(struct nfile) != sizeof(struct nhere)) { + np = stalloc(sizeof(struct nhere)); + np->nfile.fd = 0; + } + np->type = NHERE; + heredoc = stalloc(sizeof(struct heredoc)); + heredoc->here = np; + c = pgetc(); + if (c == '-') { + heredoc->striptabs = 1; + } else { + heredoc->striptabs = 0; + pungetc(); } break; - case CTLENDVAR: - putc('}', fp); - break; - case CTLBACKQ: - case CTLBACKQ|CTLQUOTE: - putc('$', fp); - putc('(', fp); - shtree(bqlist->n, -1, NULL, fp); - putc(')', fp); - break; - default: - putc(*p, fp); - break; - } - } -} + case '&': + np->type = NFROMFD; + break; -static void -indent(int amount, char *pfx, FILE *fp) -{ - int i; + case '>': + np->type = NFROMTO; + break; - for (i = 0 ; i < amount ; i++) { - if (pfx && i == amount - 1) - fputs(pfx, fp); - putc('\t', fp); + default: + np->type = NFROM; + pungetc(); + break; + } } + if (fd != '\0') + np->nfile.fd = fd - '0'; + redirnode = np; + goto parseredir_return; } - - /* - * Debugging stuff. + * Parse a substitution. At this point, we have read the dollar sign + * and nothing else. */ +/* is_special(c) evaluates to 1 for c in "!#$*-0123456789?@"; 0 otherwise + * (assuming ascii char codes, as the original implementation did) */ +#define is_special(c) \ + ((((unsigned int)c) - 33 < 32) \ + && ((0xc1ff920dUL >> (((unsigned int)c) - 33)) & 1)) +parsesub: { + int subtype; + int typeloc; + int flags; + char *p; + static const char types[] ALIGN1 = "}-+?="; -FILE *tracefile; - + c = pgetc(); + if ( + c <= PEOA_OR_PEOF || + (c != '(' && c != '{' && !is_name(c) && !is_special(c)) + ) { + USTPUTC('$', out); + pungetc(); + } else if (c == '(') { /* $(command) or $((arith)) */ + if (pgetc() == '(') { +#if ENABLE_ASH_MATH_SUPPORT + PARSEARITH(); +#else + raise_error_syntax("We unsupport $((arith))"); +#endif + } else { + pungetc(); + PARSEBACKQNEW(); + } + } else { + USTPUTC(CTLVAR, out); + typeloc = out - (char *)stackblock(); + USTPUTC(VSNORMAL, out); + subtype = VSNORMAL; + if (c == '{') { + c = pgetc(); + if (c == '#') { + c = pgetc(); + if (c == '}') + c = '#'; + else + subtype = VSLENGTH; + } else + subtype = 0; + } + if (c > PEOA_OR_PEOF && is_name(c)) { + do { + STPUTC(c, out); + c = pgetc(); + } while (c > PEOA_OR_PEOF && is_in_name(c)); + } else if (isdigit(c)) { + do { + STPUTC(c, out); + c = pgetc(); + } while (isdigit(c)); + } else if (is_special(c)) { + USTPUTC(c, out); + c = pgetc(); + } else + badsub: raise_error_syntax("Bad substitution"); -void -trputc(int c) -{ - if (debug != 1) - return; - putc(c, tracefile); + STPUTC('=', out); + flags = 0; + if (subtype == 0) { + switch (c) { + case ':': + flags = VSNUL; + c = pgetc(); + /*FALLTHROUGH*/ + default: + p = strchr(types, c); + if (p == NULL) + goto badsub; + subtype = p - types + VSNORMAL; + break; + case '%': + case '#': + { + int cc = c; + subtype = c == '#' ? VSTRIMLEFT : + VSTRIMRIGHT; + c = pgetc(); + if (c == cc) + subtype++; + else + pungetc(); + break; + } + } + } else { + pungetc(); + } + if (dblquote || arinest) + flags |= VSQUOTE; + *((char *)stackblock() + typeloc) = subtype | flags; + if (subtype != VSNORMAL) { + varnest++; + if (dblquote || arinest) { + dqvarnest++; + } + } + } + goto parsesub_return; } -void -trace(const char *fmt, ...) -{ - va_list va; +/* + * Called to parse command substitutions. Newstyle is set if the command + * is enclosed inside $(...); nlpp is a pointer to the head of the linked + * list of commands (passed by reference), and savelen is the number of + * characters on the top of the stack which must be preserved. + */ +parsebackq: { + struct nodelist **nlpp; + smallint savepbq; + union node *n; + char *volatile str; + struct jmploc jmploc; + struct jmploc *volatile savehandler; + size_t savelen; + smallint saveprompt = 0; - if (debug != 1) - return; - va_start(va, fmt); - (void) vfprintf(tracefile, fmt, va); - va_end(va); -} +#ifdef __GNUC__ + (void) &saveprompt; +#endif + savepbq = parsebackquote; + if (setjmp(jmploc.loc)) { + free(str); + parsebackquote = 0; + exception_handler = savehandler; + longjmp(exception_handler->loc, 1); + } + INT_OFF; + str = NULL; + savelen = out - (char *)stackblock(); + if (savelen > 0) { + str = ckmalloc(savelen); + memcpy(str, stackblock(), savelen); + } + savehandler = exception_handler; + exception_handler = &jmploc; + INT_ON; + if (oldstyle) { + /* We must read until the closing backquote, giving special + treatment to some slashes, and then push the string and + reread it as input, interpreting it normally. */ + char *pout; + int pc; + size_t psavelen; + char *pstr; -void -tracev(const char *fmt, va_list va) -{ - if (debug != 1) - return; - (void) vfprintf(tracefile, fmt, va); -} + STARTSTACKSTR(pout); + for (;;) { + if (needprompt) { + setprompt(2); + } + pc = pgetc(); + switch (pc) { + case '`': + goto done; -void -trputs(const char *s) -{ - if (debug != 1) - return; - fputs(s, tracefile); -} + case '\\': + pc = pgetc(); + if (pc == '\n') { + plinno++; + if (doprompt) + setprompt(2); + /* + * If eating a newline, avoid putting + * the newline into the new character + * stream (via the STPUTC after the + * switch). + */ + continue; + } + if (pc != '\\' && pc != '`' && pc != '$' + && (!dblquote || pc != '"')) + STPUTC('\\', pout); + if (pc > PEOA_OR_PEOF) { + break; + } + /* fall through */ + case PEOF: +#if ENABLE_ASH_ALIAS + case PEOA: +#endif + startlinno = plinno; + raise_error_syntax("EOF in backquote substitution"); -static void -trstring(char *s) -{ - char *p; - char c; + case '\n': + plinno++; + needprompt = doprompt; + break; - if (debug != 1) - return; - putc('"', tracefile); - for (p = s ; *p ; p++) { - switch (*p) { - case '\n': c = 'n'; goto backslash; - case '\t': c = 't'; goto backslash; - case '\r': c = 'r'; goto backslash; - case '"': c = '"'; goto backslash; - case '\\': c = '\\'; goto backslash; - case CTLESC: c = 'e'; goto backslash; - case CTLVAR: c = 'v'; goto backslash; - case CTLVAR+CTLQUOTE: c = 'V'; goto backslash; - case CTLBACKQ: c = 'q'; goto backslash; - case CTLBACKQ+CTLQUOTE: c = 'Q'; goto backslash; -backslash: putc('\\', tracefile); - putc(c, tracefile); - break; - default: - if (*p >= ' ' && *p <= '~') - putc(*p, tracefile); - else { - putc('\\', tracefile); - putc(*p >> 6 & 03, tracefile); - putc(*p >> 3 & 07, tracefile); - putc(*p & 07, tracefile); + default: + break; } - break; + STPUTC(pc, pout); + } + done: + STPUTC('\0', pout); + psavelen = pout - (char *)stackblock(); + if (psavelen > 0) { + pstr = grabstackstr(pout); + setinputstring(pstr); } } - putc('"', tracefile); -} - + nlpp = &bqlist; + while (*nlpp) + nlpp = &(*nlpp)->next; + *nlpp = stalloc(sizeof(**nlpp)); + (*nlpp)->next = NULL; + parsebackquote = oldstyle; -void -trargs(char **ap) -{ - if (debug != 1) - return; - while (*ap) { - trstring(*ap++); - if (*ap) - putc(' ', tracefile); - else - putc('\n', tracefile); + if (oldstyle) { + saveprompt = doprompt; + doprompt = 0; } -} + n = list(2); -void -opentrace(void) -{ - char s[100]; -#ifdef O_APPEND - int flags; -#endif + if (oldstyle) + doprompt = saveprompt; + else if (readtoken() != TRP) + raise_error_unexpected_syntax(TRP); - if (debug != 1) { - if (tracefile) - fflush(tracefile); - /* leave open because libedit might be using it */ - return; + (*nlpp)->n = n; + if (oldstyle) { + /* + * Start reading from old file again, ignoring any pushed back + * tokens left from the backquote parsing + */ + popfile(); + tokpushback = 0; } - scopy("./trace", s); - if (tracefile) { - if (!freopen(s, "a", tracefile)) { - fprintf(stderr, "Can't re-open %s\n", s); - debug = 0; - return; - } - } else { - if ((tracefile = fopen(s, "a")) == NULL) { - fprintf(stderr, "Can't open %s\n", s); - debug = 0; - return; - } + while (stackblocksize() <= savelen) + growstackblock(); + STARTSTACKSTR(out); + if (str) { + memcpy(out, str, savelen); + STADJUST(savelen, out); + INT_OFF; + free(str); + str = NULL; + INT_ON; } -#ifdef O_APPEND - if ((flags = fcntl(fileno(tracefile), F_GETFL, 0)) >= 0) - fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND); -#endif - setlinebuf(tracefile); - fputs("\nTracing started.\n", tracefile); + parsebackquote = savepbq; + exception_handler = savehandler; + if (arinest || dblquote) + USTPUTC(CTLBACKQ | CTLQUOTE, out); + else + USTPUTC(CTLBACKQ, out); + if (oldstyle) + goto parsebackq_oldreturn; + goto parsebackq_newreturn; } -#endif /* DEBUG */ +#if ENABLE_ASH_MATH_SUPPORT +/* + * Parse an arithmetic expansion (indicate start of one and set state) + */ +parsearith: { + if (++arinest == 1) { + prevsyntax = syntax; + syntax = ARISYNTAX; + USTPUTC(CTLARI, out); + if (dblquote) + USTPUTC('"', out); + else + USTPUTC(' ', out); + } else { + /* + * we collapse embedded arithmetic expansion to + * parenthesis, which should be equivalent + */ + USTPUTC('(', out); + } + goto parsearith_return; +} +#endif -/* trap.c */ +} /* end of readtoken */ /* - * Sigmode records the current value of the signal handlers for the various - * modes. A value of zero means that the current handler is not known. - * S_HARD_IGN indicates that the signal was ignored on entry to the shell, + * Read the next input token. + * If the token is a word, we set backquotelist to the list of cmds in + * backquotes. We set quoteflag to true if any part of the word was + * quoted. + * If the token is TREDIR, then we set redirnode to a structure containing + * the redirection. + * In all cases, the variable startlinno is set to the number of the line + * on which the token starts. + * + * [Change comment: here documents and internal procedures] + * [Readtoken shouldn't have any arguments. Perhaps we should make the + * word parsing code into a separate routine. In this case, readtoken + * doesn't need to have any internal procedures, but parseword does. + * We could also make parseoperator in essence the main routine, and + * have parseword (readtoken1?) handle both words and redirection.] */ +#define NEW_xxreadtoken +#ifdef NEW_xxreadtoken +/* singles must be first! */ +static const char xxreadtoken_chars[7] ALIGN1 = { + '\n', '(', ')', '&', '|', ';', 0 +}; -#define S_DFL 1 /* default signal handling (SIG_DFL) */ -#define S_CATCH 2 /* signal is caught */ -#define S_IGN 3 /* signal is ignored (SIG_IGN) */ -#define S_HARD_IGN 4 /* signal is ignored permenantly */ -#define S_RESET 5 /* temporary - to reset a hard ignored sig */ +static const char xxreadtoken_tokens[] ALIGN1 = { + TNL, TLP, TRP, /* only single occurrence allowed */ + TBACKGND, TPIPE, TSEMI, /* if single occurrence */ + TEOF, /* corresponds to trailing nul */ + TAND, TOR, TENDCASE /* if double occurrence */ +}; +#define xxreadtoken_doubles \ + (sizeof(xxreadtoken_tokens) - sizeof(xxreadtoken_chars)) +#define xxreadtoken_singles \ + (sizeof(xxreadtoken_chars) - xxreadtoken_doubles - 1) +static int +xxreadtoken(void) +{ + int c; -/* - * The trap builtin. - */ + if (tokpushback) { + tokpushback = 0; + return lasttoken; + } + if (needprompt) { + setprompt(2); + } + startlinno = plinno; + for (;;) { /* until token or start of word found */ + c = pgetc_macro(); -int -trapcmd(int argc, char **argv) -{ - char *action; - char **ap; - int signo; + if ((c != ' ') && (c != '\t') +#if ENABLE_ASH_ALIAS + && (c != PEOA) +#endif + ) { + if (c == '#') { + while ((c = pgetc()) != '\n' && c != PEOF); + pungetc(); + } else if (c == '\\') { + if (pgetc() != '\n') { + pungetc(); + goto READTOKEN1; + } + startlinno = ++plinno; + if (doprompt) + setprompt(2); + } else { + const char *p + = xxreadtoken_chars + sizeof(xxreadtoken_chars) - 1; - nextopt(nullstr); - ap = argptr; - if (!*ap) { - for (signo = 0 ; signo < NSIG ; signo++) { - if (trap[signo] != NULL) { - const char *sn; + if (c != PEOF) { + if (c == '\n') { + plinno++; + needprompt = doprompt; + } - sn = get_signame(signo); - out1fmt("trap -- %s %s\n", - single_quote(trap[signo]), sn); + p = strchr(xxreadtoken_chars, c); + if (p == NULL) { + READTOKEN1: + return readtoken1(c, BASESYNTAX, (char *) NULL, 0); + } + + if (p - xxreadtoken_chars >= xxreadtoken_singles) { + if (pgetc() == *p) { /* double occurrence? */ + p += xxreadtoken_doubles + 1; + } else { + pungetc(); + } + } + } + return lasttoken = xxreadtoken_tokens[p - xxreadtoken_chars]; } } - return 0; + } /* for */ +} +#else +#define RETURN(token) return lasttoken = token +static int +xxreadtoken(void) +{ + int c; + + if (tokpushback) { + tokpushback = 0; + return lasttoken; } - if (!ap[1]) - action = NULL; - else - action = *ap++; - while (*ap) { - if ((signo = get_signum(*ap)) < 0) - sh_error("%s: bad trap", *ap); - INTOFF; - if (action) { - if (LONE_DASH(action)) - action = NULL; - else - action = savestr(action); + if (needprompt) { + setprompt(2); + } + startlinno = plinno; + for (;;) { /* until token or start of word found */ + c = pgetc_macro(); + switch (c) { + case ' ': case '\t': +#if ENABLE_ASH_ALIAS + case PEOA: +#endif + continue; + case '#': + while ((c = pgetc()) != '\n' && c != PEOF); + pungetc(); + continue; + case '\\': + if (pgetc() == '\n') { + startlinno = ++plinno; + if (doprompt) + setprompt(2); + continue; + } + pungetc(); + goto breakloop; + case '\n': + plinno++; + needprompt = doprompt; + RETURN(TNL); + case PEOF: + RETURN(TEOF); + case '&': + if (pgetc() == '&') + RETURN(TAND); + pungetc(); + RETURN(TBACKGND); + case '|': + if (pgetc() == '|') + RETURN(TOR); + pungetc(); + RETURN(TPIPE); + case ';': + if (pgetc() == ';') + RETURN(TENDCASE); + pungetc(); + RETURN(TSEMI); + case '(': + RETURN(TLP); + case ')': + RETURN(TRP); + default: + goto breakloop; } - if (trap[signo]) - ckfree(trap[signo]); - trap[signo] = action; - if (signo != 0) - setsignal(signo); - INTON; - ap++; } - return 0; + breakloop: + return readtoken1(c, BASESYNTAX, (char *)NULL, 0); +#undef RETURN } +#endif /* NEW_xxreadtoken */ +static int +readtoken(void) +{ + int t; +#if DEBUG + smallint alreadyseen = tokpushback; +#endif -/* - * Clear traps on a fork. - */ +#if ENABLE_ASH_ALIAS + top: +#endif -void -clear_traps(void) -{ - char **tp; + t = xxreadtoken(); - for (tp = trap ; tp < &trap[NSIG] ; tp++) { - if (*tp && **tp) { /* trap not NULL or SIG_IGN */ - INTOFF; - ckfree(*tp); - *tp = NULL; - if (tp != &trap[0]) - setsignal(tp - trap); - INTON; + /* + * eat newlines + */ + if (checkkwd & CHKNL) { + while (t == TNL) { + parseheredoc(); + t = xxreadtoken(); } } -} + if (t != TWORD || quoteflag) { + goto out; + } -/* - * Set the signal handler for the specified signal. The routine figures - * out what it should be set to. - */ - -void -setsignal(int signo) -{ - int action; - char *t, tsig; - struct sigaction act; + /* + * check for keywords + */ + if (checkkwd & CHKKWD) { + const char *const *pp; - if ((t = trap[signo]) == NULL) - action = S_DFL; - else if (*t != '\0') - action = S_CATCH; - else - action = S_IGN; - if (rootshell && action == S_DFL) { - switch (signo) { - case SIGINT: - if (iflag || minusc || sflag == 0) - action = S_CATCH; - break; - case SIGQUIT: -#if DEBUG - if (debug) - break; -#endif - /* FALLTHROUGH */ - case SIGTERM: - if (iflag) - action = S_IGN; - break; -#if JOBS - case SIGTSTP: - case SIGTTOU: - if (mflag) - action = S_IGN; - break; -#endif + pp = findkwd(wordtext); + if (pp) { + lasttoken = t = pp - tokname_array; + TRACE(("keyword %s recognized\n", tokname(t))); + goto out; } } - t = &sigmode[signo - 1]; - tsig = *t; - if (tsig == 0) { - /* - * current setting unknown - */ - if (sigaction(signo, 0, &act) == -1) { - /* - * Pretend it worked; maybe we should give a warning - * here, but other shells don't. We don't alter - * sigmode, so that we retry every time. - */ - return; - } - if (act.sa_handler == SIG_IGN) { - if (mflag && (signo == SIGTSTP || - signo == SIGTTIN || signo == SIGTTOU)) { - tsig = S_IGN; /* don't hard ignore these */ - } else - tsig = S_HARD_IGN; - } else { - tsig = S_RESET; /* force to be set */ + if (checkkwd & CHKALIAS) { +#if ENABLE_ASH_ALIAS + struct alias *ap; + ap = lookupalias(wordtext, 1); + if (ap != NULL) { + if (*ap->val) { + pushstring(ap->val, ap); + } + goto top; } +#endif } - if (tsig == S_HARD_IGN || tsig == action) - return; - switch (action) { - case S_CATCH: - act.sa_handler = onsig; - break; - case S_IGN: - act.sa_handler = SIG_IGN; - break; - default: - act.sa_handler = SIG_DFL; - } - *t = action; - act.sa_flags = 0; - sigfillset(&act.sa_mask); - sigaction(signo, &act, 0); + out: + checkkwd = 0; +#if DEBUG + if (!alreadyseen) + TRACE(("token %s %s\n", tokname(t), t == TWORD ? wordtext : "")); + else + TRACE(("reread token %s %s\n", tokname(t), t == TWORD ? wordtext : "")); +#endif + return t; } -/* - * Ignore a signal. - */ - -void -ignoresig(int signo) +static char +peektoken(void) { - if (sigmode[signo - 1] != S_IGN && sigmode[signo - 1] != S_HARD_IGN) { - signal(signo, SIG_IGN); - } - sigmode[signo - 1] = S_HARD_IGN; -} + int t; + t = readtoken(); + tokpushback = 1; + return tokname_array[t][0]; +} /* - * Signal handler. + * Read and parse a command. Returns NEOF on end of file. (NULL is a + * valid parse tree indicating a blank line.) */ - -void -onsig(int signo) +static union node * +parsecmd(int interact) { - gotsig[signo - 1] = 1; - pendingsigs = signo; + int t; - if (exsig || (signo == SIGINT && !trap[SIGINT])) { - if (!suppressint) - onint(); - intpending = 1; - } + tokpushback = 0; + doprompt = interact; + if (doprompt) + setprompt(doprompt); + needprompt = 0; + t = readtoken(); + if (t == TEOF) + return NEOF; + if (t == TNL) + return NULL; + tokpushback = 1; + return list(1); } - /* - * Called to execute a trap. Perhaps we should avoid entering new trap - * handlers while we are executing a trap handler. + * Input any here documents. */ - -int -dotrap(void) +static void +parseheredoc(void) { - char *p; - char *q; - int i; - int savestatus; - int skip = 0; - - savestatus = exitstatus; - pendingsigs = 0; - xbarrier(); + struct heredoc *here; + union node *n; - for (i = 0, q = gotsig; i < NSIG - 1; i++, q++) { - if (!*q) - continue; - *q = 0; + here = heredoclist; + heredoclist = 0; - p = trap[i + 1]; - if (!p) - continue; - skip = evalstring(p, SKIPEVAL); - exitstatus = savestatus; - if (skip) - break; + while (here) { + if (needprompt) { + setprompt(2); + } + readtoken1(pgetc(), here->here->type == NHERE? SQSYNTAX : DQSYNTAX, + here->eofmark, here->striptabs); + n = stalloc(sizeof(struct narg)); + n->narg.type = NARG; + n->narg.next = NULL; + n->narg.text = wordtext; + n->narg.backquote = backquotelist; + here->here->nhere.doc = n; + here = here->next; } - - return skip; } /* - * Controls whether the shell is interactive or not. + * called by editline -- any expansions to the prompt should be added here. */ - -void -setinteractive(int on) +#if ENABLE_ASH_EXPAND_PRMT +static const char * +expandstr(const char *ps) { - static int is_interactive; + union node n; - if (++on == is_interactive) - return; - is_interactive = on; - setsignal(SIGINT); - setsignal(SIGQUIT); - setsignal(SIGTERM); -#ifndef CONFIG_FEATURE_SH_EXTRA_QUIET - if(is_interactive > 1) { - /* Looks like they want an interactive shell */ - static int do_banner; - - if(!do_banner) { - out1fmt( - "\n\n%s Built-in shell (ash)\n" - "Enter 'help' for a list of built-in commands.\n\n", - BB_BANNER); - do_banner++; - } - } -#endif -} + /* XXX Fix (char *) cast. */ + setinputstring((char *)ps); + readtoken1(pgetc(), PSSYNTAX, nullstr, 0); + popfile(); + n.narg.type = NARG; + n.narg.next = NULL; + n.narg.text = wordtext; + n.narg.backquote = backquotelist; -#ifndef CONFIG_FEATURE_SH_EXTRA_QUIET -/*** List the available builtins ***/ + expandarg(&n, NULL, 0); + return stackblock(); +} +#endif -static int helpcmd(int argc, char **argv) +/* + * Execute a command or commands contained in a string. + */ +static int +evalstring(char *s, int mask) { - int col, i; + union node *n; + struct stackmark smark; + int skip; - out1fmt("\nBuilt-in commands:\n-------------------\n"); - for (col = 0, i = 0; i < NUMBUILTINS; i++) { - col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '), - builtincmd[i].name + 1); - if (col > 60) { - out1fmt("\n"); - col = 0; - } + setinputstring(s); + setstackmark(&smark); + + skip = 0; + while ((n = parsecmd(0)) != NEOF) { + evaltree(n, 0); + popstackmark(&smark); + skip = evalskip; + if (skip) + break; } -#ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL - { - extern const struct BB_applet applets[]; - extern const size_t NUM_APPLETS; - - for (i = 0; i < NUM_APPLETS; i++) { + popfile(); - col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '), applets[i].name); - if (col > 60) { - out1fmt("\n"); - col = 0; - } - } - } -#endif - out1fmt("\n\n"); - return EXIT_SUCCESS; + skip &= mask; + evalskip = skip; + return skip; } -#endif /* CONFIG_FEATURE_SH_EXTRA_QUIET */ /* - * Called to exit the shell. + * The eval command. */ - -void -exitshell(void) +static int +evalcmd(int argc, char **argv) { - struct jmploc loc; char *p; - int status; + char *concat; + char **ap; - status = exitstatus; - TRACE(("pid %d, exitshell(%d)\n", getpid(), status)); - if (setjmp(loc.loc)) { - if (exception == EXEXIT) - _exit(exitstatus); - goto out; - } - handler = &loc; - if ((p = trap[0])) { - trap[0] = NULL; - evalstring(p, 0); - } - flushall(); - setjobctl(0); -#ifdef CONFIG_FEATURE_COMMAND_SAVEHISTORY - if (iflag && rootshell) { - const char *hp = lookupvar("HISTFILE"); + if (argc > 1) { + p = argv[1]; + if (argc > 2) { + STARTSTACKSTR(concat); + ap = argv + 2; + for (;;) { + concat = stack_putstr(p, concat); + p = *ap++; + if (p == NULL) + break; + STPUTC(' ', concat); + } + STPUTC('\0', concat); + p = grabstackstr(concat); + } + evalstring(p, ~SKIPEVAL); - if(hp != NULL ) - save_history ( hp ); } -#endif -out: - _exit(status); - /* NOTREACHED */ + return exitstatus; } -/* var.c */ - -static struct var *vartab[VTABSIZE]; - -static int vpcmp(const void *, const void *); -static struct var **findvar(struct var **, const char *); - /* - * Initialize the variable symbol tables and import the environment + * Read and execute commands. "Top" is nonzero for the top level command + * loop; it turns on prompting if the shell is interactive. */ +static int +cmdloop(int top) +{ + union node *n; + struct stackmark smark; + int inter; + int numeof = 0; + TRACE(("cmdloop(%d) called\n", top)); + for (;;) { + int skip; -#ifdef CONFIG_ASH_GETOPTS -/* - * Safe version of setvar, returns 1 on success 0 on failure. - */ - -int -setvarsafe(const char *name, const char *val, int flags) -{ - int err; - volatile int saveint; - struct jmploc *volatile savehandler = handler; - struct jmploc jmploc; + setstackmark(&smark); +#if JOBS + if (jobctl) + showjobs(stderr, SHOW_CHANGED); +#endif + inter = 0; + if (iflag && top) { + inter++; +#if ENABLE_ASH_MAIL + chkmail(); +#endif + } + n = parsecmd(inter); + /* showtree(n); DEBUG */ + if (n == NEOF) { + if (!top || numeof >= 50) + break; + if (!stoppedjobs()) { + if (!Iflag) + break; + out2str("\nUse \"exit\" to leave shell.\n"); + } + numeof++; + } else if (nflag == 0) { + /* job_warning can only be 2,1,0. Here 2->1, 1/0->0 */ + job_warning >>= 1; + numeof = 0; + evaltree(n, 0); + } + popstackmark(&smark); + skip = evalskip; - SAVEINT(saveint); - if (setjmp(jmploc.loc)) - err = 1; - else { - handler = &jmploc; - setvar(name, val, flags); - err = 0; + if (skip) { + evalskip = 0; + return skip & SKIPEVAL; + } } - handler = savehandler; - RESTOREINT(saveint); - return err; + return 0; } -#endif /* - * Set the value of a variable. The flags argument is ored with the - * flags of the variable. If val is NULL, the variable is unset. + * Take commands from a file. To be compatible we should do a path + * search for the file, which is necessary to find sub-commands. */ - -static void -setvar(const char *name, const char *val, int flags) +static char * +find_dot_file(char *name) { - char *p, *q; - size_t namelen; - char *nameeq; - size_t vallen; + char *fullname; + const char *path = pathval(); + struct stat statb; - q = endofname(name); - p = strchrnul(q, '='); - namelen = p - name; - if (!namelen || p != q) - sh_error("%.*s: bad variable name", namelen, name); - vallen = 0; - if (val == NULL) { - flags |= VUNSET; - } else { - vallen = strlen(val); - } - INTOFF; - nameeq = ckmalloc(namelen + vallen + 2); - p = memcpy(nameeq, name, namelen) + namelen; - if (val) { - *p++ = '='; - p = memcpy(p, val, vallen) + vallen; - } - *p = '\0'; - setvareq(nameeq, flags | VNOSAVE); - INTON; -} + /* don't try this for absolute or relative paths */ + if (strchr(name, '/')) + return name; + while ((fullname = padvance(&path, name)) != NULL) { + if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) { + /* + * Don't bother freeing here, since it will + * be freed by the caller. + */ + return fullname; + } + stunalloc(fullname); + } -/* - * Same as setvar except that the variable and value are passed in - * the first argument as name=value. Since the first argument will - * be actually stored in the table, it should not be a string that - * will go away. - * Called with interrupts off. - */ + /* not found in the PATH */ + ash_msg_and_raise_error("%s: not found", name); + /* NOTREACHED */ +} -void -setvareq(char *s, int flags) +static int +dotcmd(int argc, char **argv) { - struct var *vp, **vpp; + struct strlist *sp; + volatile struct shparam saveparam; + int status = 0; - vpp = hashvar(s); - flags |= (VEXPORT & (((unsigned) (1 - aflag)) - 1)); - vp = *findvar(vpp, s); - if (vp) { - if ((vp->flags & (VREADONLY|VDYNAMIC)) == VREADONLY) { - const char *n; + for (sp = cmdenviron; sp; sp = sp->next) + setvareq(ckstrdup(sp->text), VSTRFIXED | VTEXTFIXED); - if (flags & VNOSAVE) - free(s); - n = vp->text; - sh_error("%.*s: is read only", strchrnul(n, '=') - n, n); - } + if (argc >= 2) { /* That's what SVR2 does */ + char *fullname; - if (flags & VNOSET) - return; + fullname = find_dot_file(argv[1]); - if (vp->func && (flags & VNOFUNC) == 0) - (*vp->func)(strchrnul(s, '=') + 1); + if (argc > 2) { + saveparam = shellparam; + shellparam.malloc = 0; + shellparam.nparam = argc - 2; + shellparam.p = argv + 2; + }; - if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0) - ckfree(vp->text); + setinputfile(fullname, INPUT_PUSH_FILE); + commandname = fullname; + cmdloop(0); + popfile(); - flags |= vp->flags & ~(VTEXTFIXED|VSTACK|VNOSAVE|VUNSET); - } else { - if (flags & VNOSET) - return; - /* not found */ - vp = ckmalloc(sizeof (*vp)); - vp->next = *vpp; - vp->func = NULL; - *vpp = vp; + if (argc > 2) { + freeparam(&shellparam); + shellparam = saveparam; + }; + status = exitstatus; } - if (!(flags & (VTEXTFIXED|VSTACK|VNOSAVE))) - s = savestr(s); - vp->text = s; - vp->flags = flags; + return status; } - -/* - * Process a linked list of variable assignments. - */ - -static void -listsetvar(struct strlist *list_set_var, int flags) +static int +exitcmd(int argc, char **argv) { - struct strlist *lp = list_set_var; - - if (!lp) - return; - INTOFF; - do { - setvareq(lp->text, flags); - } while ((lp = lp->next)); - INTON; + if (stoppedjobs()) + return 0; + if (argc > 1) + exitstatus = number(argv[1]); + raise_exception(EXEXIT); + /* NOTREACHED */ } - -/* - * Find the value of a variable. Returns NULL if not set. - */ - -static char * -lookupvar(const char *name) +#if ENABLE_ASH_BUILTIN_ECHO +static int +echocmd(int argc, char **argv) { - struct var *v; - - if ((v = *findvar(hashvar(name), name))) { -#ifdef DYNAMIC_VAR - /* - * Dynamic variables are implemented roughly the same way they are - * in bash. Namely, they're "special" so long as they aren't unset. - * As soon as they're unset, they're no longer dynamic, and dynamic - * lookup will no longer happen at that point. -- PFM. - */ - if((v->flags & VDYNAMIC)) - (*v->func)(NULL); + return bb_echo(argv); +} #endif - if(!(v->flags & VUNSET)) - return strchrnul(v->text, '=') + 1; - } - return NULL; +#if ENABLE_ASH_BUILTIN_TEST +static int +testcmd(int argc, char **argv) +{ + return test_main(argc, argv); } - +#endif /* - * Search the environment of a builtin command. + * Read a file containing shell functions. */ - -static char * -bltinlookup(const char *name) +static void +readcmdfile(char *name) { - struct strlist *sp; - - for (sp = cmdenviron ; sp ; sp = sp->next) { - if (varequal(sp->text, name)) - return strchrnul(sp->text, '=') + 1; - } - return lookupvar(name); + setinputfile(name, INPUT_PUSH_FILE); + cmdloop(0); + popfile(); } +/* ============ find_command inplementation */ + /* - * Generate a list of variables satisfying the given conditions. + * Resolve a command name. If you change this routine, you may have to + * change the shellexec routine as well. */ - -static char ** -listvars(int on, int off, char ***end) +static void +find_command(char *name, struct cmdentry *entry, int act, const char *path) { - struct var **vpp; - struct var *vp; - char **ep; - int mask; + struct tblentry *cmdp; + int idx; + int prev; + char *fullname; + struct stat statb; + int e; + int updatetbl; + struct builtincmd *bcmd; - STARTSTACKSTR(ep); - vpp = vartab; - mask = on | off; - do { - for (vp = *vpp ; vp ; vp = vp->next) - if ((vp->flags & mask) == on) { - if (ep == stackstrend()) - ep = growstackstr(); - *ep++ = (char *) vp->text; + /* If name contains a slash, don't use PATH or hash table */ + if (strchr(name, '/') != NULL) { + entry->u.index = -1; + if (act & DO_ABS) { + while (stat(name, &statb) < 0) { +#ifdef SYSV + if (errno == EINTR) + continue; +#endif + entry->cmdtype = CMDUNKNOWN; + return; } - } while (++vpp < vartab + VTABSIZE); - if (ep == stackstrend()) - ep = growstackstr(); - if (end) - *end = ep; - *ep++ = NULL; - return grabstackstr(ep); -} + } + entry->cmdtype = CMDNORMAL; + return; + } +/* #if ENABLE_FEATURE_SH_STANDALONE... moved after builtin check */ -/* - * POSIX requires that 'set' (but not export or readonly) output the - * variables in lexicographic order - by the locale's collating order (sigh). - * Maybe we could keep them in an ordered balanced binary tree - * instead of hashed lists. - * For now just roll 'em through qsort for printing... - */ + updatetbl = (path == pathval()); + if (!updatetbl) { + act |= DO_ALTPATH; + if (strstr(path, "%builtin") != NULL) + act |= DO_ALTBLTIN; + } -static int -showvars(const char *sep_prefix, int on, int off) -{ - const char *sep; - char **ep, **epend; + /* If name is in the table, check answer will be ok */ + cmdp = cmdlookup(name, 0); + if (cmdp != NULL) { + int bit; - ep = listvars(on, off, &epend); - qsort(ep, epend - ep, sizeof(char *), vpcmp); + switch (cmdp->cmdtype) { + default: +#if DEBUG + abort(); +#endif + case CMDNORMAL: + bit = DO_ALTPATH; + break; + case CMDFUNCTION: + bit = DO_NOFUNC; + break; + case CMDBUILTIN: + bit = DO_ALTBLTIN; + break; + } + if (act & bit) { + updatetbl = 0; + cmdp = NULL; + } else if (cmdp->rehash == 0) + /* if not invalidated by cd, we're done */ + goto success; + } - sep = *sep_prefix ? spcstr : sep_prefix; + /* If %builtin not in path, check for builtin next */ + bcmd = find_builtin(name); + if (bcmd) { + if (IS_BUILTIN_REGULAR(bcmd)) + goto builtin_success; + if (act & DO_ALTPATH) { + if (!(act & DO_ALTBLTIN)) + goto builtin_success; + } else if (builtinloc <= 0) { + goto builtin_success; + } + } - for (; ep < epend; ep++) { - const char *p; - const char *q; +#if ENABLE_FEATURE_SH_STANDALONE + if (find_applet_by_name(name)) { + entry->cmdtype = CMDNORMAL; + entry->u.index = -1; + return; + } +#endif - p = strchrnul(*ep, '='); - q = nullstr; - if (*p) - q = single_quote(++p); + /* We have to search path. */ + prev = -1; /* where to start */ + if (cmdp && cmdp->rehash) { /* doing a rehash */ + if (cmdp->cmdtype == CMDBUILTIN) + prev = builtinloc; + else + prev = cmdp->param.index; + } - out1fmt("%s%s%.*s%s\n", sep_prefix, sep, (int)(p - *ep), *ep, q); + e = ENOENT; + idx = -1; + loop: + while ((fullname = padvance(&path, name)) != NULL) { + stunalloc(fullname); + /* NB: code below will still use fullname + * despite it being "unallocated" */ + idx++; + if (pathopt) { + if (prefix(pathopt, "builtin")) { + if (bcmd) + goto builtin_success; + continue; + } else if (!(act & DO_NOFUNC) + && prefix(pathopt, "func")) { + /* handled below */ + } else { + /* ignore unimplemented options */ + continue; + } + } + /* if rehash, don't redo absolute path names */ + if (fullname[0] == '/' && idx <= prev) { + if (idx < prev) + continue; + TRACE(("searchexec \"%s\": no change\n", name)); + goto success; + } + while (stat(fullname, &statb) < 0) { +#ifdef SYSV + if (errno == EINTR) + continue; +#endif + if (errno != ENOENT && errno != ENOTDIR) + e = errno; + goto loop; + } + e = EACCES; /* if we fail, this will be the error */ + if (!S_ISREG(statb.st_mode)) + continue; + if (pathopt) { /* this is a %func directory */ + stalloc(strlen(fullname) + 1); + /* NB: stalloc will return space pointed by fullname + * (because we don't have any intervening allocations + * between stunalloc above and this stalloc) */ + readcmdfile(fullname); + cmdp = cmdlookup(name, 0); + if (cmdp == NULL || cmdp->cmdtype != CMDFUNCTION) + ash_msg_and_raise_error("%s not defined in %s", name, fullname); + stunalloc(fullname); + goto success; + } + TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname)); + if (!updatetbl) { + entry->cmdtype = CMDNORMAL; + entry->u.index = idx; + return; + } + INT_OFF; + cmdp = cmdlookup(name, 1); + cmdp->cmdtype = CMDNORMAL; + cmdp->param.index = idx; + INT_ON; + goto success; } - return 0; + /* We failed. If there was an entry for this command, delete it */ + if (cmdp && updatetbl) + delete_cmd_entry(); + if (act & DO_ERR) + ash_msg("%s: %s", name, errmsg(e, "not found")); + entry->cmdtype = CMDUNKNOWN; + return; + + builtin_success: + if (!updatetbl) { + entry->cmdtype = CMDBUILTIN; + entry->u.cmd = bcmd; + return; + } + INT_OFF; + cmdp = cmdlookup(name, 1); + cmdp->cmdtype = CMDBUILTIN; + cmdp->param.cmd = bcmd; + INT_ON; + success: + cmdp->rehash = 0; + entry->cmdtype = cmdp->cmdtype; + entry->u = cmdp->param; } +/* ============ trap.c */ /* - * The export and readonly commands. + * The trap builtin. */ - static int -exportcmd(int argc, char **argv) +trapcmd(int argc, char **argv) { - struct var *vp; - char *name; - const char *p; - char **aptr; - int flag = argv[0][0] == 'r'? VREADONLY : VEXPORT; - int notp; + char *action; + char **ap; + int signo; - notp = nextopt("p") - 'p'; - if (notp && ((name = *(aptr = argptr)))) { - do { - if ((p = strchr(name, '=')) != NULL) { - p++; - } else { - if ((vp = *findvar(hashvar(name), name))) { - vp->flags |= flag; - continue; - } + nextopt(nullstr); + ap = argptr; + if (!*ap) { + for (signo = 0; signo < NSIG; signo++) { + if (trap[signo] != NULL) { + const char *sn; + + sn = get_signame(signo); + out1fmt("trap -- %s %s\n", + single_quote(trap[signo]), sn); } - setvar(name, p, flag); - } while ((name = *++aptr) != NULL); - } else { - showvars(argv[0], flag, 0); + } + return 0; + } + if (!ap[1]) + action = NULL; + else + action = *ap++; + while (*ap) { + signo = get_signum(*ap); + if (signo < 0) + ash_msg_and_raise_error("%s: bad trap", *ap); + INT_OFF; + if (action) { + if (LONE_DASH(action)) + action = NULL; + else + action = ckstrdup(action); + } + free(trap[signo]); + trap[signo] = action; + if (signo != 0) + setsignal(signo); + INT_ON; + ap++; } return 0; } +/* ============ Builtins */ + +#if !ENABLE_FEATURE_SH_EXTRA_QUIET /* - * Make a variable a local variable. When a variable is made local, it's - * value and flags are saved in a localvar structure. The saved values - * will be restored when the shell function returns. We handle the name - * "-" as a special case. + * Lists available builtins */ - -static void mklocal(char *name) +static int +helpcmd(int argc, char **argv) { - struct localvar *lvp; - struct var **vpp; - struct var *vp; - - INTOFF; - lvp = ckmalloc(sizeof (struct localvar)); - if (LONE_DASH(name)) { - char *p; - p = ckmalloc(sizeof(optlist)); - lvp->text = memcpy(p, optlist, sizeof(optlist)); - vp = NULL; - } else { - char *eq; + int col, i; - vpp = hashvar(name); - vp = *findvar(vpp, name); - eq = strchr(name, '='); - if (vp == NULL) { - if (eq) - setvareq(name, VSTRFIXED); - else - setvar(name, NULL, VSTRFIXED); - vp = *vpp; /* the new variable */ - lvp->flags = VUNSET; - } else { - lvp->text = vp->text; - lvp->flags = vp->flags; - vp->flags |= VSTRFIXED|VTEXTFIXED; - if (eq) - setvareq(name, 0); + out1fmt("\nBuilt-in commands:\n-------------------\n"); + for (col = 0, i = 0; i < ARRAY_SIZE(builtintab); i++) { + col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '), + builtintab[i].name + 1); + if (col > 60) { + out1fmt("\n"); + col = 0; } } - lvp->vp = vp; - lvp->next = localvars; - localvars = lvp; - INTON; +#if ENABLE_FEATURE_SH_STANDALONE + for (i = 0; i < NUM_APPLETS; i++) { + col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '), applets[i].name); + if (col > 60) { + out1fmt("\n"); + col = 0; + } + } +#endif + out1fmt("\n\n"); + return EXIT_SUCCESS; } +#endif /* FEATURE_SH_EXTRA_QUIET */ /* - * The "local" command. + * The export and readonly commands. */ - static int -localcmd(int argc, char **argv) +exportcmd(int argc, char **argv) { + struct var *vp; char *name; + const char *p; + char **aptr; + int flag = argv[0][0] == 'r'? VREADONLY : VEXPORT; - argv = argptr; - while ((name = *argv++) != NULL) { - mklocal(name); + if (nextopt("p") != 'p') { + aptr = argptr; + name = *aptr; + if (name) { + do { + p = strchr(name, '='); + if (p != NULL) { + p++; + } else { + vp = *findvar(hashvar(name), name); + if (vp) { + vp->flags |= flag; + continue; + } + } + setvar(name, p, flag); + } while ((name = *++aptr) != NULL); + return 0; + } } + showvars(argv[0], flag, 0); return 0; } - /* - * Called after a function returns. - * Interrupts must be off. + * Delete a function if it exists. */ - static void -poplocalvars(void) +unsetfunc(const char *name) { - struct localvar *lvp; - struct var *vp; + struct tblentry *cmdp; - while ((lvp = localvars) != NULL) { - localvars = lvp->next; - vp = lvp->vp; - TRACE(("poplocalvar %s", vp ? vp->text : "-")); - if (vp == NULL) { /* $- saved */ - memcpy(optlist, lvp->text, sizeof(optlist)); - ckfree(lvp->text); - optschanged(); - } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) { - unsetvar(vp->text); - } else { - if (vp->func) - (*vp->func)(strchrnul(lvp->text, '=') + 1); - if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0) - ckfree(vp->text); - vp->flags = lvp->flags; - vp->text = lvp->text; - } - ckfree(lvp); - } + cmdp = cmdlookup(name, 0); + if (cmdp!= NULL && cmdp->cmdtype == CMDFUNCTION) + delete_cmd_entry(); } - /* * The unset builtin command. We unset the function before we unset the * variable to allow a function to be unset when there is a readonly variable * with the same name. */ - -int +static int unsetcmd(int argc, char **argv) { char **ap; @@ -12360,7 +11364,7 @@ unsetcmd(int argc, char **argv) flag = i; } - for (ap = argptr; *ap ; ap++) { + for (ap = argptr; *ap; ap++) { if (flag != 'f') { i = unsetvar(*ap); ret |= i; @@ -12374,115 +11378,11 @@ unsetcmd(int argc, char **argv) } -/* - * Unset the specified variable. - */ - -int -unsetvar(const char *s) -{ - struct var **vpp; - struct var *vp; - int retval; - - vpp = findvar(hashvar(s), s); - vp = *vpp; - retval = 2; - if (vp) { - int flags = vp->flags; - - retval = 1; - if (flags & VREADONLY) - goto out; -#ifdef DYNAMIC_VAR - vp->flags &= ~VDYNAMIC; -#endif - if (flags & VUNSET) - goto ok; - if ((flags & VSTRFIXED) == 0) { - INTOFF; - if ((flags & (VTEXTFIXED|VSTACK)) == 0) - ckfree(vp->text); - *vpp = vp->next; - ckfree(vp); - INTON; - } else { - setvar(s, 0, 0); - vp->flags &= ~VEXPORT; - } -ok: - retval = 0; - } - -out: - return retval; -} - - - -/* - * Find the appropriate entry in the hash table from the name. - */ - -static struct var ** -hashvar(const char *p) -{ - unsigned int hashval; - - hashval = ((unsigned char) *p) << 4; - while (*p && *p != '=') - hashval += (unsigned char) *p++; - return &vartab[hashval % VTABSIZE]; -} - - - -/* - * Compares two strings up to the first = or '\0'. The first - * string must be terminated by '='; the second may be terminated by - * either '=' or '\0'. - */ - -int -varcmp(const char *p, const char *q) -{ - int c, d; - - while ((c = *p) == (d = *q)) { - if (!c || c == '=') - goto out; - p++; - q++; - } - if (c == '=') - c = 0; - if (d == '=') - d = 0; -out: - return c - d; -} - -static int -vpcmp(const void *a, const void *b) -{ - return varcmp(*(const char **)a, *(const char **)b); -} - -static struct var ** -findvar(struct var **vpp, const char *name) -{ - for (; *vpp; vpp = &(*vpp)->next) { - if (varequal((*vpp)->text, name)) { - break; - } - } - return vpp; -} /* setmode.c */ #include -static const unsigned char timescmd_str[] = { +static const unsigned char timescmd_str[] ALIGN1 = { ' ', offsetof(struct tms, tms_utime), '\n', offsetof(struct tms, tms_stime), ' ', offsetof(struct tms, tms_cutime), @@ -12490,9 +11390,10 @@ static const unsigned char timescmd_str[] = { 0 }; -static int timescmd(int ac, char **av) +static int +timescmd(int ac, char **av) { - long int clk_tck, s, t; + long clk_tck, s, t; const unsigned char *p; struct tms buf; @@ -12512,38 +11413,35 @@ static int timescmd(int ac, char **av) return 0; } -#ifdef CONFIG_ASH_MATH_SUPPORT +#if ENABLE_ASH_MATH_SUPPORT static arith_t dash_arith(const char *s) { arith_t result; int errcode = 0; - INTOFF; + INT_OFF; result = arith(s, &errcode); if (errcode < 0) { if (errcode == -3) - sh_error("exponent less than 0"); - else if (errcode == -2) - sh_error("divide by zero"); - else if (errcode == -5) - sh_error("expression recursion loop detected"); - else - synerror(s); + ash_msg_and_raise_error("exponent less than 0"); + if (errcode == -2) + ash_msg_and_raise_error("divide by zero"); + if (errcode == -5) + ash_msg_and_raise_error("expression recursion loop detected"); + raise_error_syntax(s); } - INTON; + INT_ON; return result; } - /* * The let builtin. partial stolen from GNU Bash, the Bourne Again SHell. * Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc. * * Copyright (C) 2003 Vladimir Oleynik */ - static int letcmd(int argc, char **argv) { @@ -12551,19 +11449,19 @@ letcmd(int argc, char **argv) arith_t i = 0; ap = argv + 1; - if(!*ap) - sh_error("expression expected"); + if (!*ap) + ash_msg_and_raise_error("expression expected"); for (ap = argv + 1; *ap; ap++) { i = dash_arith(*ap); } return !i; } -#endif /* CONFIG_ASH_MATH_SUPPORT */ +#endif /* ASH_MATH_SUPPORT */ -/* miscbltin.c */ -/* +/* ============ miscbltin.c + * * Miscellaneous builtins. */ @@ -12573,14 +11471,12 @@ letcmd(int argc, char **argv) typedef enum __rlimit_resource rlim_t; #endif - /* * The read builtin. The -e option causes backslashes to escape the * following character. * * This uses unbuffered input, which may be avoidable in some cases. */ - static int readcmd(int argc, char **argv) { @@ -12594,13 +11490,13 @@ readcmd(int argc, char **argv) int startword; int status; int i; -#if defined(CONFIG_ASH_READ_NCHARS) +#if ENABLE_ASH_READ_NCHARS int nch_flag = 0; int nchars = 0; int silent = 0; struct termios tty, old_tty; #endif -#if defined(CONFIG_ASH_READ_TIMEOUT) +#if ENABLE_ASH_READ_TIMEOUT fd_set set; struct timeval ts; @@ -12609,32 +11505,32 @@ readcmd(int argc, char **argv) rflag = 0; prompt = NULL; -#if defined(CONFIG_ASH_READ_NCHARS) && defined(CONFIG_ASH_READ_TIMEOUT) +#if ENABLE_ASH_READ_NCHARS && ENABLE_ASH_READ_TIMEOUT while ((i = nextopt("p:rt:n:s")) != '\0') -#elif defined(CONFIG_ASH_READ_NCHARS) +#elif ENABLE_ASH_READ_NCHARS while ((i = nextopt("p:rn:s")) != '\0') -#elif defined(CONFIG_ASH_READ_TIMEOUT) +#elif ENABLE_ASH_READ_TIMEOUT while ((i = nextopt("p:rt:")) != '\0') #else while ((i = nextopt("p:r")) != '\0') #endif { - switch(i) { + switch (i) { case 'p': prompt = optionarg; break; -#if defined(CONFIG_ASH_READ_NCHARS) +#if ENABLE_ASH_READ_NCHARS case 'n': nchars = strtol(optionarg, &p, 10); if (*p) - sh_error("invalid count"); + ash_msg_and_raise_error("invalid count"); nch_flag = (nchars > 0); break; case 's': silent = 1; break; #endif -#if defined(CONFIG_ASH_READ_TIMEOUT) +#if ENABLE_ASH_READ_TIMEOUT case 't': ts.tv_sec = strtol(optionarg, &p, 10); ts.tv_usec = 0; @@ -12644,19 +11540,19 @@ readcmd(int argc, char **argv) int scale; ts.tv_usec = strtol(p, &p2, 10); if (*p2) - sh_error("invalid timeout"); + ash_msg_and_raise_error("invalid timeout"); scale = p2 - p; /* normalize to usec */ if (scale > 6) - sh_error("invalid timeout"); + ash_msg_and_raise_error("invalid timeout"); while (scale++ < 6) ts.tv_usec *= 10; } } else if (*p) { - sh_error("invalid timeout"); + ash_msg_and_raise_error("invalid timeout"); } if ( ! ts.tv_sec && ! ts.tv_usec) - sh_error("invalid timeout"); + ash_msg_and_raise_error("invalid timeout"); break; #endif case 'r': @@ -12669,33 +11565,36 @@ readcmd(int argc, char **argv) if (prompt && isatty(0)) { out2str(prompt); } - if (*(ap = argptr) == NULL) - sh_error("arg count"); - if ((ifs = bltinlookup("IFS")) == NULL) + ap = argptr; + if (*ap == NULL) + ash_msg_and_raise_error("arg count"); + ifs = bltinlookup("IFS"); + if (ifs == NULL) ifs = defifs; -#if defined(CONFIG_ASH_READ_NCHARS) +#if ENABLE_ASH_READ_NCHARS if (nch_flag || silent) { tcgetattr(0, &tty); old_tty = tty; if (nch_flag) { - tty.c_lflag &= ~ICANON; - tty.c_cc[VMIN] = nchars; + tty.c_lflag &= ~ICANON; + tty.c_cc[VMIN] = nchars; } if (silent) { - tty.c_lflag &= ~(ECHO|ECHOK|ECHONL); + tty.c_lflag &= ~(ECHO|ECHOK|ECHONL); } tcsetattr(0, TCSANOW, &tty); } #endif -#if defined(CONFIG_ASH_READ_TIMEOUT) +#if ENABLE_ASH_READ_TIMEOUT if (ts.tv_sec || ts.tv_usec) { - FD_ZERO (&set); - FD_SET (0, &set); +// TODO: replace with poll, it is smaller + FD_ZERO(&set); + FD_SET(0, &set); i = select(FD_SETSIZE, &set, NULL, NULL, &ts); if (!i) { -#if defined(CONFIG_ASH_READ_NCHARS) +#if ENABLE_ASH_READ_NCHARS if (nch_flag) tcsetattr(0, TCSANOW, &old_tty); #endif @@ -12707,7 +11606,7 @@ readcmd(int argc, char **argv) startword = 1; backslash = 0; STARTSTACKSTR(p); -#if defined(CONFIG_ASH_READ_NCHARS) +#if ENABLE_ASH_READ_NCHARS while (!nch_flag || nchars--) #else for (;;) @@ -12742,11 +11641,11 @@ readcmd(int argc, char **argv) startword = 1; STARTSTACKSTR(p); } else { -put: + put: STPUTC(c, p); } } -#if defined(CONFIG_ASH_READ_NCHARS) +#if ENABLE_ASH_READ_NCHARS if (nch_flag || silent) tcsetattr(0, TCSANOW, &old_tty); #endif @@ -12761,12 +11660,12 @@ put: return status; } - -static int umaskcmd(int argc, char **argv) +static int +umaskcmd(int argc, char **argv) { - static const char permuser[3] = "ugo"; - static const char permmode[3] = "rwx"; - static const short int permmask[] = { + static const char permuser[3] ALIGN1 = "ugo"; + static const char permmode[3] ALIGN1 = "rwx"; + static const short permmask[] ALIGN2 = { S_IRUSR, S_IWUSR, S_IXUSR, S_IRGRP, S_IWGRP, S_IXGRP, S_IROTH, S_IWOTH, S_IXOTH @@ -12781,12 +11680,13 @@ static int umaskcmd(int argc, char **argv) symbolic_mode = 1; } - INTOFF; + INT_OFF; mask = umask(0); umask(mask); - INTON; + INT_ON; - if ((ap = *argptr) == NULL) { + ap = *argptr; + if (ap == NULL) { if (symbolic_mode) { char buf[18]; char *p = buf; @@ -12809,18 +11709,18 @@ static int umaskcmd(int argc, char **argv) out1fmt("%.4o\n", mask); } } else { - if (is_digit((unsigned char) *ap)) { + if (isdigit((unsigned char) *ap)) { mask = 0; do { if (*ap >= '8' || *ap < '0') - sh_error(illnum, argv[1]); + ash_msg_and_raise_error(illnum, argv[1]); mask = (mask << 3) + (*ap - '0'); } while (*++ap != '\0'); umask(mask); } else { mask = ~mask & 0777; if (!bb_parse_mode(ap, &mask)) { - sh_error("Illegal mode: %s", ap); + ash_msg_and_raise_error("illegal mode: %s", ap); } umask(~mask & 0777); } @@ -12879,12 +11779,13 @@ static const struct limits limits[] = { #ifdef RLIMIT_LOCKS { "locks", RLIMIT_LOCKS, 1, 'w' }, #endif - { (char *) 0, 0, 0, '\0' } + { NULL, 0, 0, '\0' } }; enum limtype { SOFT = 0x1, HARD = 0x2 }; -static void printlim(enum limtype how, const struct rlimit *limit, +static void +printlim(enum limtype how, const struct rlimit *limit, const struct limits *l) { rlim_t val; @@ -12901,16 +11802,16 @@ static void printlim(enum limtype how, const struct rlimit *limit, } } -int +static int ulimitcmd(int argc, char **argv) { - int c; + int c; rlim_t val = 0; enum limtype how = SOFT | HARD; - const struct limits *l; - int set, all = 0; - int optc, what; - struct rlimit limit; + const struct limits *l; + int set, all = 0; + int optc, what; + struct rlimit limit; what = 'f'; while ((optc = nextopt("HSa" @@ -12947,7 +11848,7 @@ ulimitcmd(int argc, char **argv) #ifdef RLIMIT_LOCKS "w" #endif - )) != '\0') + )) != '\0') switch (optc) { case 'H': how = HARD; @@ -12970,20 +11871,19 @@ ulimitcmd(int argc, char **argv) char *p = *argptr; if (all || argptr[1]) - sh_error("too many arguments"); + ash_msg_and_raise_error("too many arguments"); if (strncmp(p, "unlimited\n", 9) == 0) val = RLIM_INFINITY; else { val = (rlim_t) 0; - while ((c = *p++) >= '0' && c <= '9') - { + while ((c = *p++) >= '0' && c <= '9') { val = (val * 10) + (long)(c - '0'); if (val < (rlim_t) 0) break; } if (c) - sh_error("bad number"); + ash_msg_and_raise_error("bad number"); val *= l->factor; } } @@ -13003,7 +11903,7 @@ ulimitcmd(int argc, char **argv) if (how & SOFT) limit.rlim_cur = val; if (setrlimit(l->cmd, &limit) < 0) - sh_error("error setting limit (%m)"); + ash_msg_and_raise_error("error setting limit (%m)"); } else { printlim(how, &limit, l); } @@ -13011,7 +11911,9 @@ ulimitcmd(int argc, char **argv) } -#ifdef CONFIG_ASH_MATH_SUPPORT +/* ============ Math support */ + +#if ENABLE_ASH_MATH_SUPPORT /* Copyright (c) 2001 Aaron Lehmann @@ -13107,11 +12009,9 @@ ulimitcmd(int argc, char **argv) * - always use special isspace(), see comment from bash ;-) */ - #define arith_isspace(arithval) \ (arithval == ' ' || arithval == '\n' || arithval == '\t') - typedef unsigned char operator; /* An operator's token id is a bit of a bitfield. The lower 5 bits are the @@ -13141,7 +12041,7 @@ typedef unsigned char operator; #define TOK_REM_ASSIGN tok_decl(3,2) /* all assign is right associativity and precedence eq, but (7+3)<<5 > 256 */ -#define convert_prec_is_assing(prec) do { if(prec == 3) prec = 2; } while(0) +#define convert_prec_is_assing(prec) do { if (prec == 3) prec = 2; } while (0) /* conditional is right associativity too */ #define TOK_CONDITIONAL tok_decl(4,0) @@ -13203,7 +12103,8 @@ typedef unsigned char operator; #define NUMPTR (*numstackptr) -static int tok_have_assign(operator op) +static int +tok_have_assign(operator op) { operator prec = PREC(op); @@ -13212,13 +12113,13 @@ static int tok_have_assign(operator op) prec == PREC_PRE || prec == PREC_POST); } -static int is_right_associativity(operator prec) +static int +is_right_associativity(operator prec) { - return (prec == PREC(TOK_ASSIGN) || prec == PREC(TOK_EXPONENT) || - prec == PREC(TOK_CONDITIONAL)); + return (prec == PREC(TOK_ASSIGN) || prec == PREC(TOK_EXPONENT) + || prec == PREC(TOK_CONDITIONAL)); } - typedef struct ARITCH_VAR_NUM { arith_t val; arith_t contidional_second_val; @@ -13227,7 +12128,6 @@ typedef struct ARITCH_VAR_NUM { else is variable name */ } v_n_t; - typedef struct CHK_VAR_RECURSIVE_LOOPED { const char *var; struct CHK_VAR_RECURSIVE_LOOPED *next; @@ -13235,59 +12135,59 @@ typedef struct CHK_VAR_RECURSIVE_LOOPED { static chk_var_recursive_looped_t *prev_chk_var_recursive; - -static int arith_lookup_val(v_n_t *t) +static int +arith_lookup_val(v_n_t *t) { - if(t->var) { - const char * p = lookupvar(t->var); + if (t->var) { + const char * p = lookupvar(t->var); - if(p) { - int errcode; + if (p) { + int errcode; - /* recursive try as expression */ - chk_var_recursive_looped_t *cur; - chk_var_recursive_looped_t cur_save; + /* recursive try as expression */ + chk_var_recursive_looped_t *cur; + chk_var_recursive_looped_t cur_save; - for(cur = prev_chk_var_recursive; cur; cur = cur->next) { - if(strcmp(cur->var, t->var) == 0) { - /* expression recursion loop detected */ - return -5; - } - } - /* save current lookuped var name */ - cur = prev_chk_var_recursive; - cur_save.var = t->var; - cur_save.next = cur; - prev_chk_var_recursive = &cur_save; + for (cur = prev_chk_var_recursive; cur; cur = cur->next) { + if (strcmp(cur->var, t->var) == 0) { + /* expression recursion loop detected */ + return -5; + } + } + /* save current lookuped var name */ + cur = prev_chk_var_recursive; + cur_save.var = t->var; + cur_save.next = cur; + prev_chk_var_recursive = &cur_save; - t->val = arith (p, &errcode); - /* restore previous ptr after recursiving */ - prev_chk_var_recursive = cur; - return errcode; - } else { - /* allow undefined var as 0 */ - t->val = 0; + t->val = arith (p, &errcode); + /* restore previous ptr after recursiving */ + prev_chk_var_recursive = cur; + return errcode; + } + /* allow undefined var as 0 */ + t->val = 0; } - } - return 0; + return 0; } /* "applying" a token means performing it on the top elements on the integer * stack. For a unary operator it will only change the top element, but a * binary operator will pop two arguments and push a result */ -static int arith_apply(operator op, v_n_t *numstack, v_n_t **numstackptr) +static int +arith_apply(operator op, v_n_t *numstack, v_n_t **numstackptr) { v_n_t *numptr_m1; arith_t numptr_val, rez; int ret_arith_lookup_val; - if (NUMPTR == numstack) goto err; /* There is no operator that can work - without arguments */ + /* There is no operator that can work without arguments */ + if (NUMPTR == numstack) goto err; numptr_m1 = NUMPTR - 1; /* check operand is var with noninteger value */ ret_arith_lookup_val = arith_lookup_val(numptr_m1); - if(ret_arith_lookup_val) + if (ret_arith_lookup_val) return ret_arith_lookup_val; rez = numptr_m1->val; @@ -13304,116 +12204,113 @@ static int arith_apply(operator op, v_n_t *numstack, v_n_t **numstackptr) else if (op != TOK_UPLUS) { /* Binary operators */ - /* check and binary operators need two arguments */ - if (numptr_m1 == numstack) goto err; - - /* ... and they pop one */ - --NUMPTR; - numptr_val = rez; - if (op == TOK_CONDITIONAL) { - if(! numptr_m1->contidional_second_val_initialized) { - /* protect $((expr1 ? expr2)) without ": expr" */ - goto err; - } - rez = numptr_m1->contidional_second_val; - } else if(numptr_m1->contidional_second_val_initialized) { - /* protect $((expr1 : expr2)) without "expr ? " */ - goto err; - } - numptr_m1 = NUMPTR - 1; - if(op != TOK_ASSIGN) { - /* check operand is var with noninteger value for not '=' */ - ret_arith_lookup_val = arith_lookup_val(numptr_m1); - if(ret_arith_lookup_val) - return ret_arith_lookup_val; - } - if (op == TOK_CONDITIONAL) { - numptr_m1->contidional_second_val = rez; - } - rez = numptr_m1->val; - if (op == TOK_BOR || op == TOK_OR_ASSIGN) + /* check and binary operators need two arguments */ + if (numptr_m1 == numstack) goto err; + + /* ... and they pop one */ + --NUMPTR; + numptr_val = rez; + if (op == TOK_CONDITIONAL) { + if (! numptr_m1->contidional_second_val_initialized) { + /* protect $((expr1 ? expr2)) without ": expr" */ + goto err; + } + rez = numptr_m1->contidional_second_val; + } else if (numptr_m1->contidional_second_val_initialized) { + /* protect $((expr1 : expr2)) without "expr ? " */ + goto err; + } + numptr_m1 = NUMPTR - 1; + if (op != TOK_ASSIGN) { + /* check operand is var with noninteger value for not '=' */ + ret_arith_lookup_val = arith_lookup_val(numptr_m1); + if (ret_arith_lookup_val) + return ret_arith_lookup_val; + } + if (op == TOK_CONDITIONAL) { + numptr_m1->contidional_second_val = rez; + } + rez = numptr_m1->val; + if (op == TOK_BOR || op == TOK_OR_ASSIGN) rez |= numptr_val; - else if (op == TOK_OR) + else if (op == TOK_OR) rez = numptr_val || rez; - else if (op == TOK_BAND || op == TOK_AND_ASSIGN) + else if (op == TOK_BAND || op == TOK_AND_ASSIGN) rez &= numptr_val; - else if (op == TOK_BXOR || op == TOK_XOR_ASSIGN) + else if (op == TOK_BXOR || op == TOK_XOR_ASSIGN) rez ^= numptr_val; - else if (op == TOK_AND) + else if (op == TOK_AND) rez = rez && numptr_val; - else if (op == TOK_EQ) + else if (op == TOK_EQ) rez = (rez == numptr_val); - else if (op == TOK_NE) + else if (op == TOK_NE) rez = (rez != numptr_val); - else if (op == TOK_GE) + else if (op == TOK_GE) rez = (rez >= numptr_val); - else if (op == TOK_RSHIFT || op == TOK_RSHIFT_ASSIGN) + else if (op == TOK_RSHIFT || op == TOK_RSHIFT_ASSIGN) rez >>= numptr_val; - else if (op == TOK_LSHIFT || op == TOK_LSHIFT_ASSIGN) + else if (op == TOK_LSHIFT || op == TOK_LSHIFT_ASSIGN) rez <<= numptr_val; - else if (op == TOK_GT) + else if (op == TOK_GT) rez = (rez > numptr_val); - else if (op == TOK_LT) + else if (op == TOK_LT) rez = (rez < numptr_val); - else if (op == TOK_LE) + else if (op == TOK_LE) rez = (rez <= numptr_val); - else if (op == TOK_MUL || op == TOK_MUL_ASSIGN) + else if (op == TOK_MUL || op == TOK_MUL_ASSIGN) rez *= numptr_val; - else if (op == TOK_ADD || op == TOK_PLUS_ASSIGN) + else if (op == TOK_ADD || op == TOK_PLUS_ASSIGN) rez += numptr_val; - else if (op == TOK_SUB || op == TOK_MINUS_ASSIGN) + else if (op == TOK_SUB || op == TOK_MINUS_ASSIGN) rez -= numptr_val; - else if (op == TOK_ASSIGN || op == TOK_COMMA) + else if (op == TOK_ASSIGN || op == TOK_COMMA) rez = numptr_val; - else if (op == TOK_CONDITIONAL_SEP) { + else if (op == TOK_CONDITIONAL_SEP) { if (numptr_m1 == numstack) { - /* protect $((expr : expr)) without "expr ? " */ - goto err; + /* protect $((expr : expr)) without "expr ? " */ + goto err; } numptr_m1->contidional_second_val_initialized = op; numptr_m1->contidional_second_val = numptr_val; - } - else if (op == TOK_CONDITIONAL) { + } else if (op == TOK_CONDITIONAL) { rez = rez ? - numptr_val : numptr_m1->contidional_second_val; - } - else if(op == TOK_EXPONENT) { - if(numptr_val < 0) + numptr_val : numptr_m1->contidional_second_val; + } else if (op == TOK_EXPONENT) { + if (numptr_val < 0) return -3; /* exponent less than 0 */ else { arith_t c = 1; - if(numptr_val) - while(numptr_val--) + if (numptr_val) + while (numptr_val--) c *= rez; rez = c; } - } - else if(numptr_val==0) /* zero divisor check */ + } else if (numptr_val==0) /* zero divisor check */ return -2; - else if (op == TOK_DIV || op == TOK_DIV_ASSIGN) + else if (op == TOK_DIV || op == TOK_DIV_ASSIGN) rez /= numptr_val; - else if (op == TOK_REM || op == TOK_REM_ASSIGN) + else if (op == TOK_REM || op == TOK_REM_ASSIGN) rez %= numptr_val; } - if(tok_have_assign(op)) { - char buf[32]; + if (tok_have_assign(op)) { + char buf[sizeof(arith_t_type)*3 + 2]; - if(numptr_m1->var == NULL) { + if (numptr_m1->var == NULL) { /* Hmm, 1=2 ? */ goto err; } /* save to shell variable */ -#ifdef CONFIG_ASH_MATH_SUPPORT_64 - snprintf(buf, sizeof(buf), "%lld", arith_t_type rez); +#if ENABLE_ASH_MATH_SUPPORT_64 + snprintf(buf, sizeof(buf), "%lld", (arith_t_type) rez); #else - snprintf(buf, sizeof(buf), "%ld", arith_t_type rez); + snprintf(buf, sizeof(buf), "%ld", (arith_t_type) rez); #endif setvar(numptr_m1->var, buf, 0); /* after saving, make previous value for v++ or v-- */ - if(op == TOK_POST_INC) + if (op == TOK_POST_INC) rez--; - else if(op == TOK_POST_DEC) + else if (op == TOK_POST_DEC) rez++; } numptr_m1->val = rez; @@ -13424,8 +12321,8 @@ static int arith_apply(operator op, v_n_t *numstack, v_n_t **numstackptr) return -1; } -/* longest must first */ -static const char op_tokens[] = { +/* longest must be first */ +static const char op_tokens[] ALIGN1 = { '<','<','=',0, TOK_LSHIFT_ASSIGN, '>','>','=',0, TOK_RSHIFT_ASSIGN, '<','<', 0, TOK_LSHIFT, @@ -13471,105 +12368,109 @@ static const char op_tokens[] = { /* ptr to ")" */ #define endexpression &op_tokens[sizeof(op_tokens)-7] - -static arith_t arith (const char *expr, int *perrcode) +static arith_t +arith(const char *expr, int *perrcode) { - char arithval; /* Current character under analysis */ - operator lasttok, op; - operator prec; + char arithval; /* Current character under analysis */ + operator lasttok, op; + operator prec; - const char *p = endexpression; - int errcode; + const char *p = endexpression; + int errcode; - size_t datasizes = strlen(expr) + 2; + size_t datasizes = strlen(expr) + 2; - /* Stack of integers */ - /* The proof that there can be no more than strlen(startbuf)/2+1 integers - * in any given correct or incorrect expression is left as an exercise to - * the reader. */ - v_n_t *numstack = alloca(((datasizes)/2)*sizeof(v_n_t)), - *numstackptr = numstack; - /* Stack of operator tokens */ - operator *stack = alloca((datasizes) * sizeof(operator)), - *stackptr = stack; + /* Stack of integers */ + /* The proof that there can be no more than strlen(startbuf)/2+1 integers + * in any given correct or incorrect expression is left as an exercise to + * the reader. */ + v_n_t *numstack = alloca(((datasizes)/2)*sizeof(v_n_t)), + *numstackptr = numstack; + /* Stack of operator tokens */ + operator *stack = alloca((datasizes) * sizeof(operator)), + *stackptr = stack; + + *stackptr++ = lasttok = TOK_LPAREN; /* start off with a left paren */ + *perrcode = errcode = 0; + + while (1) { + arithval = *expr; + if (arithval == 0) { + if (p == endexpression) { + /* Null expression. */ + return 0; + } - *stackptr++ = lasttok = TOK_LPAREN; /* start off with a left paren */ - *perrcode = errcode = 0; + /* This is only reached after all tokens have been extracted from the + * input stream. If there are still tokens on the operator stack, they + * are to be applied in order. At the end, there should be a final + * result on the integer stack */ - while(1) { - if ((arithval = *expr) == 0) { - if (p == endexpression) { - /* Null expression. */ - return 0; + if (expr != endexpression + 1) { + /* If we haven't done so already, */ + /* append a closing right paren */ + expr = endexpression; + /* and let the loop process it. */ + continue; + } + /* At this point, we're done with the expression. */ + if (numstackptr != numstack+1) { + /* ... but if there isn't, it's bad */ + err: + return (*perrcode = -1); + } + if (numstack->var) { + /* expression is $((var)) only, lookup now */ + errcode = arith_lookup_val(numstack); + } + ret: + *perrcode = errcode; + return numstack->val; } - /* This is only reached after all tokens have been extracted from the - * input stream. If there are still tokens on the operator stack, they - * are to be applied in order. At the end, there should be a final - * result on the integer stack */ - - if (expr != endexpression + 1) { - /* If we haven't done so already, */ - /* append a closing right paren */ - expr = endexpression; - /* and let the loop process it. */ - continue; - } - /* At this point, we're done with the expression. */ - if (numstackptr != numstack+1) { - /* ... but if there isn't, it's bad */ - err: - return (*perrcode = -1); - } - if(numstack->var) { - /* expression is $((var)) only, lookup now */ - errcode = arith_lookup_val(numstack); - } - ret: - *perrcode = errcode; - return numstack->val; - } else { /* Continue processing the expression. */ if (arith_isspace(arithval)) { /* Skip whitespace */ goto prologue; } - if((p = endofname(expr)) != expr) { + p = endofname(expr); + if (p != expr) { size_t var_name_size = (p-expr) + 1; /* trailing zero */ numstackptr->var = alloca(var_name_size); safe_strncpy(numstackptr->var, expr, var_name_size); expr = p; - num: + num: numstackptr->contidional_second_val_initialized = 0; numstackptr++; lasttok = TOK_NUM; continue; - } else if (is_digit(arithval)) { + } + if (isdigit(arithval)) { numstackptr->var = NULL; -#ifdef CONFIG_ASH_MATH_SUPPORT_64 +#if ENABLE_ASH_MATH_SUPPORT_64 numstackptr->val = strtoll(expr, (char **) &expr, 0); #else numstackptr->val = strtol(expr, (char **) &expr, 0); #endif goto num; } - for(p = op_tokens; ; p++) { + for (p = op_tokens; ; p++) { const char *o; - if(*p == 0) { + if (*p == 0) { /* strange operator not found */ goto err; } - for(o = expr; *p && *o == *p; p++) + for (o = expr; *p && *o == *p; p++) o++; - if(! *p) { + if (! *p) { /* found */ expr = o - 1; break; } /* skip tail uncompared token */ - while(*p) + while (*p) p++; /* skip zero delim */ p++; @@ -13577,27 +12478,27 @@ static arith_t arith (const char *expr, int *perrcode) op = p[1]; /* post grammar: a++ reduce to num */ - if(lasttok == TOK_POST_INC || lasttok == TOK_POST_DEC) - lasttok = TOK_NUM; + if (lasttok == TOK_POST_INC || lasttok == TOK_POST_DEC) + lasttok = TOK_NUM; /* Plus and minus are binary (not unary) _only_ if the last * token was as number, or a right paren (which pretends to be * a number, since it evaluates to one). Think about it. * It makes sense. */ if (lasttok != TOK_NUM) { - switch(op) { - case TOK_ADD: - op = TOK_UPLUS; - break; - case TOK_SUB: - op = TOK_UMINUS; - break; - case TOK_POST_INC: - op = TOK_PRE_INC; - break; - case TOK_POST_DEC: - op = TOK_PRE_DEC; - break; + switch (op) { + case TOK_ADD: + op = TOK_UPLUS; + break; + case TOK_SUB: + op = TOK_UMINUS; + break; + case TOK_POST_INC: + op = TOK_PRE_INC; + break; + case TOK_POST_DEC: + op = TOK_PRE_DEC; + break; } } /* We don't want a unary operator to cause recursive descent on the @@ -13619,30 +12520,30 @@ static arith_t arith (const char *expr, int *perrcode) goto err; } while (stackptr != stack) { - if (op == TOK_RPAREN) { - /* The algorithm employed here is simple: while we don't - * hit an open paren nor the bottom of the stack, pop - * tokens and apply them */ - if (stackptr[-1] == TOK_LPAREN) { - --stackptr; - /* Any operator directly after a */ - lasttok = TOK_NUM; - /* close paren should consider itself binary */ - goto prologue; - } - } else { - operator prev_prec = PREC(stackptr[-1]); + if (op == TOK_RPAREN) { + /* The algorithm employed here is simple: while we don't + * hit an open paren nor the bottom of the stack, pop + * tokens and apply them */ + if (stackptr[-1] == TOK_LPAREN) { + --stackptr; + /* Any operator directly after a */ + lasttok = TOK_NUM; + /* close paren should consider itself binary */ + goto prologue; + } + } else { + operator prev_prec = PREC(stackptr[-1]); - convert_prec_is_assing(prec); - convert_prec_is_assing(prev_prec); - if (prev_prec < prec) - break; - /* check right assoc */ - if(prev_prec == prec && is_right_associativity(prec)) - break; - } - errcode = arith_apply(*--stackptr, numstack, &numstackptr); - if(errcode) goto ret; + convert_prec_is_assing(prec); + convert_prec_is_assing(prev_prec); + if (prev_prec < prec) + break; + /* check right assoc */ + if (prev_prec == prec && is_right_associativity(prec)) + break; + } + errcode = arith_apply(*--stackptr, numstack, &numstackptr); + if (errcode) goto ret; } if (op == TOK_RPAREN) { goto err; @@ -13651,14 +12552,314 @@ static arith_t arith (const char *expr, int *perrcode) /* Push this operator to the stack and remember it. */ *stackptr++ = lasttok = op; - - prologue: + prologue: ++expr; + } /* while */ +} +#endif /* ASH_MATH_SUPPORT */ + + +/* ============ main() and helpers */ + +/* + * Called to exit the shell. + */ +static void exitshell(void) ATTRIBUTE_NORETURN; +static void +exitshell(void) +{ + struct jmploc loc; + char *p; + int status; + + status = exitstatus; + TRACE(("pid %d, exitshell(%d)\n", getpid(), status)); + if (setjmp(loc.loc)) { + if (exception == EXEXIT) +/* dash bug: it just does _exit(exitstatus) here + * but we have to do setjobctl(0) first! + * (bug is still not fixed in dash-0.5.3 - if you run dash + * under Midnight Commander, on exit from dash MC is backgrounded) */ + status = exitstatus; + goto out; + } + exception_handler = &loc; + p = trap[0]; + if (p) { + trap[0] = NULL; + evalstring(p, 0); + } + flush_stdout_stderr(); + out: + setjobctl(0); + _exit(status); + /* NOTREACHED */ +} + +static void +init(void) +{ + /* from input.c: */ + basepf.nextc = basepf.buf = basebuf; + + /* from trap.c: */ + signal(SIGCHLD, SIG_DFL); + + /* from var.c: */ + { + char **envp; + char ppid[sizeof(int)*3 + 1]; + const char *p; + struct stat st1, st2; + + initvar(); + for (envp = environ; envp && *envp; envp++) { + if (strchr(*envp, '=')) { + setvareq(*envp, VEXPORT|VTEXTFIXED); + } + } + + snprintf(ppid, sizeof(ppid), "%u", (unsigned) getppid()); + setvar("PPID", ppid, 0); + + p = lookupvar("PWD"); + if (p) + if (*p != '/' || stat(p, &st1) || stat(".", &st2) + || st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino) + p = '\0'; + setpwd(p, 0); + } +} + +/* + * Process the shell command line arguments. + */ +static void +procargs(int argc, char **argv) +{ + int i; + const char *xminusc; + char **xargv; + + xargv = argv; + arg0 = xargv[0]; + if (argc > 0) + xargv++; + for (i = 0; i < NOPTS; i++) + optlist[i] = 2; + argptr = xargv; + options(1); + xargv = argptr; + xminusc = minusc; + if (*xargv == NULL) { + if (xminusc) + ash_msg_and_raise_error(bb_msg_requires_arg, "-c"); + sflag = 1; + } + if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1)) + iflag = 1; + if (mflag == 2) + mflag = iflag; + for (i = 0; i < NOPTS; i++) + if (optlist[i] == 2) + optlist[i] = 0; +#if DEBUG == 2 + debug = 1; +#endif + /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */ + if (xminusc) { + minusc = *xargv++; + if (*xargv) + goto setarg0; + } else if (!sflag) { + setinputfile(*xargv, 0); + setarg0: + arg0 = *xargv++; + commandname = arg0; + } + + shellparam.p = xargv; +#if ENABLE_ASH_GETOPTS + shellparam.optind = 1; + shellparam.optoff = -1; +#endif + /* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */ + while (*xargv) { + shellparam.nparam++; + xargv++; } - } + optschanged(); +} + +/* + * Read /etc/profile or .profile. + */ +static void +read_profile(const char *name) +{ + int skip; + + if (setinputfile(name, INPUT_PUSH_FILE | INPUT_NOFILE_OK) < 0) + return; + skip = cmdloop(0); + popfile(); + if (skip) + exitshell(); +} + +/* + * This routine is called when an error or an interrupt occurs in an + * interactive shell and control is returned to the main command loop. + */ +static void +reset(void) +{ + /* from eval.c: */ + evalskip = 0; + loopnest = 0; + /* from input.c: */ + parselleft = parsenleft = 0; /* clear input buffer */ + popallfiles(); + /* from parser.c: */ + tokpushback = 0; + checkkwd = 0; + /* from redir.c: */ + clearredir(0); } -#endif /* CONFIG_ASH_MATH_SUPPORT */ +#if PROFILE +static short profile_buf[16384]; +extern int etext(); +#endif + +/* + * Main routine. We initialize things, parse the arguments, execute + * profiles if we're a login shell, and then call cmdloop to execute + * commands. The setjmp call sets up the location to jump to when an + * exception occurs. When an exception occurs the variable "state" + * is used to figure out how far we had gotten. + */ +int ash_main(int argc, char **argv); +int ash_main(int argc, char **argv) +{ + char *shinit; + volatile int state; + struct jmploc jmploc; + struct stackmark smark; + +#if PROFILE + monitor(4, etext, profile_buf, sizeof(profile_buf), 50); +#endif + +#if ENABLE_FEATURE_EDITING + line_input_state = new_line_input_t(FOR_SHELL | WITH_PATH_LOOKUP); +#endif + state = 0; + if (setjmp(jmploc.loc)) { + int e; + int s; + + reset(); + + e = exception; + if (e == EXERROR) + exitstatus = 2; + s = state; + if (e == EXEXIT || s == 0 || iflag == 0 || shlvl) + exitshell(); + + if (e == EXINT) { + outcslow('\n', stderr); + } + popstackmark(&smark); + FORCE_INT_ON; /* enable interrupts */ + if (s == 1) + goto state1; + if (s == 2) + goto state2; + if (s == 3) + goto state3; + goto state4; + } + exception_handler = &jmploc; +#if DEBUG + opentrace(); + trace_puts("Shell args: "); + trace_puts_args(argv); +#endif + rootpid = getpid(); + +#if ENABLE_ASH_RANDOM_SUPPORT + rseed = rootpid + time(NULL); +#endif + init(); + setstackmark(&smark); + procargs(argc, argv); +#if ENABLE_FEATURE_EDITING_SAVEHISTORY + if (iflag) { + const char *hp = lookupvar("HISTFILE"); + + if (hp == NULL) { + hp = lookupvar("HOME"); + if (hp != NULL) { + char *defhp = concat_path_file(hp, ".ash_history"); + setvar("HISTFILE", defhp, 0); + free(defhp); + } + } + } +#endif + if (argv[0] && argv[0][0] == '-') + isloginsh = 1; + if (isloginsh) { + state = 1; + read_profile("/etc/profile"); + state1: + state = 2; + read_profile(".profile"); + } + state2: + state = 3; + if ( +#ifndef linux + getuid() == geteuid() && getgid() == getegid() && +#endif + iflag + ) { + shinit = lookupvar("ENV"); + if (shinit != NULL && *shinit != '\0') { + read_profile(shinit); + } + } + state3: + state = 4; + if (minusc) + evalstring(minusc, 0); + + if (sflag || minusc == NULL) { +#if ENABLE_FEATURE_EDITING_SAVEHISTORY + if ( iflag ) { + const char *hp = lookupvar("HISTFILE"); + + if (hp != NULL) + line_input_state->hist_file = hp; + } +#endif + state4: /* XXX ??? - why isn't this before the "if" statement */ + cmdloop(1); + } +#if PROFILE + monitor(0); +#endif +#ifdef GPROF + { + extern void _mcleanup(void); + _mcleanup(); + } +#endif + exitshell(); + /* NOTREACHED */ +} #if DEBUG const char *applet_name = "debug stuff usage"; @@ -13668,6 +12869,7 @@ int main(int argc, char **argv) } #endif + /*- * Copyright (c) 1989, 1991, 1993, 1994 * The Regents of the University of California. All rights reserved.