1 /* vi: set sw=4 ts=4: */
3 * ash shell port for busybox
5 * Copyright (c) 1989, 1991, 1993, 1994
6 * The Regents of the University of California. All rights reserved.
8 * Copyright (c) 1997-2005 Herbert Xu <herbert@gondor.apana.org.au>
9 * was re-ported from NetBSD and debianized.
11 * This code is derived from software contributed to Berkeley by
14 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
16 * Original BSD copyright notice is retained at the end of this file.
20 * The following should be set to reflect the type of system you have:
21 * JOBS -> 1 if you have Berkeley job control, 0 otherwise.
22 * define SYSV if you are running under System V.
23 * define DEBUG=1 to compile in debugging ('set -o debug' to turn on)
24 * define DEBUG=2 to compile in and turn on debugging.
26 * When debugging is on, debugging info will be written to ./trace and
27 * a quit signal will generate a core dump.
30 /* Tweak debug output verbosity here */
39 #define JOBS ENABLE_ASH_JOB_CONTROL
47 #include "busybox.h" /* for applet_names */
48 //TODO: pull in some .h and find out do we have SINGLE_APPLET_MAIN?
49 //#include "applet_tables.h" doesn't work
55 #if defined SINGLE_APPLET_MAIN
56 /* STANDALONE does not make sense, and won't compile */
57 #undef CONFIG_FEATURE_SH_STANDALONE
58 #undef ENABLE_FEATURE_SH_STANDALONE
59 #undef IF_FEATURE_SH_STANDALONE
60 #undef IF_NOT_FEATURE_SH_STANDALONE(...)
61 #define ENABLE_FEATURE_SH_STANDALONE 0
62 #define IF_FEATURE_SH_STANDALONE(...)
63 #define IF_NOT_FEATURE_SH_STANDALONE(...) __VA_ARGS__
67 # define PIPE_BUF 4096 /* amount of buffering in a pipe */
70 #if defined(__uClinux__)
71 # error "Do not even bother, ash will not run on NOMMU machine"
75 /* ============ Hash table sizes. Configurable. */
79 #define CMDTABLESIZE 31 /* should be prime */
82 /* ============ Shell options */
84 static const char *const optletters_optnames[] = {
105 #define optletters(n) optletters_optnames[(n)][0]
106 #define optnames(n) (&optletters_optnames[(n)][1])
108 enum { NOPTS = ARRAY_SIZE(optletters_optnames) };
111 /* ============ Misc data */
113 static const char homestr[] ALIGN1 = "HOME";
114 static const char snlfmt[] ALIGN1 = "%s\n";
115 static const char illnum[] ALIGN1 = "Illegal number: %s";
118 * We enclose jmp_buf in a structure so that we can declare pointers to
119 * jump locations. The global variable handler contains the location to
120 * jump to when an exception occurs, and the global variable exception_type
121 * contains a code identifying the exception. To implement nested
122 * exception handlers, the user should save the value of handler on entry
123 * to an inner scope, set handler to point to a jmploc structure for the
124 * inner scope, and restore handler on exit from the scope.
130 struct globals_misc {
131 /* pid of main shell */
133 /* shell level: 0 for the main shell, 1 for its children, and so on */
135 #define rootshell (!shlvl)
136 char *minusc; /* argument to -c option */
138 char *curdir; // = nullstr; /* current working directory */
139 char *physdir; // = nullstr; /* physical working directory */
141 char *arg0; /* value of $0 */
143 struct jmploc *exception_handler;
145 // disabled by vda: cannot understand how it was supposed to work -
146 // cannot fix bugs. That's why you have to explain your non-trivial designs!
147 // /* do we generate EXSIG events */
148 // int exsig; /* counter */
149 volatile int suppressint; /* counter */
151 // pendingsig -> pending_sig
152 // intpending -> pending_int
153 volatile /*sig_atomic_t*/ smallint intpending; /* 1 = got SIGINT */
154 /* last pending signal */
155 volatile /*sig_atomic_t*/ smallint pendingsig;
156 smallint exception_type; /* kind of exception (0..5) */
158 #define EXINT 0 /* SIGINT received */
159 #define EXERROR 1 /* a generic error */
160 #define EXSHELLPROC 2 /* execute a shell procedure */
161 #define EXEXEC 3 /* command execution failed */
162 #define EXEXIT 4 /* exit the shell */
163 #define EXSIG 5 /* trapped signal in wait(1) */
166 char nullstr[1]; /* zero length string */
169 #define eflag optlist[0]
170 #define fflag optlist[1]
171 #define Iflag optlist[2]
172 #define iflag optlist[3]
173 #define mflag optlist[4]
174 #define nflag optlist[5]
175 #define sflag optlist[6]
176 #define xflag optlist[7]
177 #define vflag optlist[8]
178 #define Cflag optlist[9]
179 #define aflag optlist[10]
180 #define bflag optlist[11]
181 #define uflag optlist[12]
182 #define viflag optlist[13]
184 #define nolog optlist[14]
185 #define debug optlist[15]
188 /* trap handler commands */
190 * Sigmode records the current value of the signal handlers for the various
191 * modes. A value of zero means that the current handler is not known.
192 * S_HARD_IGN indicates that the signal was ignored on entry to the shell.
194 char sigmode[NSIG - 1];
195 #define S_DFL 1 /* default signal handling (SIG_DFL) */
196 #define S_CATCH 2 /* signal is caught */
197 #define S_IGN 3 /* signal is ignored (SIG_IGN) */
198 #define S_HARD_IGN 4 /* signal is ignored permenantly */
200 /* indicates specified signal received */
201 uint8_t gotsig[NSIG - 1]; /* offset by 1: "signal" 0 is meaningless */
204 /* Rarely referenced stuff */
205 #if ENABLE_ASH_RANDOM_SUPPORT
206 /* Random number generators */
207 int32_t random_galois_LFSR; /* Galois LFSR (fast but weak). signed! */
208 uint32_t random_LCG; /* LCG (fast but weak) */
210 pid_t backgndpid; /* pid of last background process */
211 smallint job_warning; /* user was warned about stopped jobs (can be 2, 1 or 0). */
213 extern struct globals_misc *const ash_ptr_to_globals_misc;
214 #define G_misc (*ash_ptr_to_globals_misc)
215 #define rootpid (G_misc.rootpid )
216 #define shlvl (G_misc.shlvl )
217 #define minusc (G_misc.minusc )
218 #define curdir (G_misc.curdir )
219 #define physdir (G_misc.physdir )
220 #define arg0 (G_misc.arg0 )
221 #define exception_handler (G_misc.exception_handler)
222 #define exception_type (G_misc.exception_type )
223 #define suppressint (G_misc.suppressint )
224 #define intpending (G_misc.intpending )
225 //#define exsig (G_misc.exsig )
226 #define pendingsig (G_misc.pendingsig )
227 #define isloginsh (G_misc.isloginsh )
228 #define nullstr (G_misc.nullstr )
229 #define optlist (G_misc.optlist )
230 #define sigmode (G_misc.sigmode )
231 #define gotsig (G_misc.gotsig )
232 #define trap (G_misc.trap )
233 #define random_galois_LFSR (G_misc.random_galois_LFSR)
234 #define random_LCG (G_misc.random_LCG )
235 #define backgndpid (G_misc.backgndpid )
236 #define job_warning (G_misc.job_warning)
237 #define INIT_G_misc() do { \
238 (*(struct globals_misc**)&ash_ptr_to_globals_misc) = xzalloc(sizeof(G_misc)); \
245 /* ============ DEBUG */
247 static void trace_printf(const char *fmt, ...);
248 static void trace_vprintf(const char *fmt, va_list va);
249 # define TRACE(param) trace_printf param
250 # define TRACEV(param) trace_vprintf param
251 # define close(fd) do { \
253 if (close(dfd) < 0) \
254 bb_error_msg("bug on %d: closing %d(0x%x)", \
255 __LINE__, dfd, dfd); \
258 # define TRACE(param)
259 # define TRACEV(param)
263 /* ============ Utility functions */
264 #define xbarrier() do { __asm__ __volatile__ ("": : :"memory"); } while (0)
266 /* C99 say: "char" declaration may be signed or unsigned by default */
267 #define signed_char2int(sc) ((int)(signed char)(sc))
269 static int isdigit_str9(const char *str)
271 int maxlen = 9 + 1; /* max 9 digits: 999999999 */
272 while (--maxlen && isdigit(*str))
274 return (*str == '\0');
278 /* ============ Interrupts / exceptions */
280 * These macros allow the user to suspend the handling of interrupt signals
281 * over a period of time. This is similar to SIGHOLD or to sigblock, but
282 * much more efficient and portable. (But hacking the kernel is so much
283 * more fun than worrying about efficiency and portability. :-))
285 #define INT_OFF do { \
291 * Called to raise an exception. Since C doesn't include exceptions, we
292 * just do a longjmp to the exception handler. The type of exception is
293 * stored in the global variable "exception_type".
295 static void raise_exception(int) NORETURN;
297 raise_exception(int e)
300 if (exception_handler == NULL)
305 longjmp(exception_handler->loc, 1);
308 #define raise_exception(e) do { \
309 TRACE(("raising exception %d on line %d\n", (e), __LINE__)); \
310 raise_exception(e); \
315 * Called from trap.c when a SIGINT is received. (If the user specifies
316 * that SIGINT is to be trapped or ignored using the trap builtin, then
317 * this routine is not called.) Suppressint is nonzero when interrupts
318 * are held using the INT_OFF macro. (The test for iflag is just
319 * defensive programming.)
321 static void raise_interrupt(void) NORETURN;
323 raise_interrupt(void)
328 /* Signal is not automatically unmasked after it is raised,
329 * do it ourself - unmask all signals */
330 sigprocmask_allsigs(SIG_UNBLOCK);
331 /* pendingsig = 0; - now done in onsig() */
334 if (gotsig[SIGINT - 1] && !trap[SIGINT]) {
335 if (!(rootshell && iflag)) {
336 /* Kill ourself with SIGINT */
337 signal(SIGINT, SIG_DFL);
342 raise_exception(ex_type);
346 #define raise_interrupt() do { \
347 TRACE(("raising interrupt on line %d\n", __LINE__)); \
352 static IF_ASH_OPTIMIZE_FOR_SIZE(inline) void
356 if (--suppressint == 0 && intpending) {
360 #define INT_ON int_on()
361 static IF_ASH_OPTIMIZE_FOR_SIZE(inline) void
369 #define FORCE_INT_ON force_int_on()
371 #define SAVE_INT(v) ((v) = suppressint)
373 #define RESTORE_INT(v) do { \
376 if (suppressint == 0 && intpending) \
381 /* ============ Stdout/stderr output */
384 outstr(const char *p, FILE *file)
392 flush_stdout_stderr(void)
409 outcslow(int c, FILE *dest)
417 static int out1fmt(const char *, ...) __attribute__((__format__(__printf__,1,2)));
419 out1fmt(const char *fmt, ...)
426 r = vprintf(fmt, ap);
432 static int fmtstr(char *, size_t, const char *, ...) __attribute__((__format__(__printf__,3,4)));
434 fmtstr(char *outbuf, size_t length, const char *fmt, ...)
441 ret = vsnprintf(outbuf, length, fmt, ap);
448 out1str(const char *p)
454 out2str(const char *p)
461 /* ============ Parser structures */
463 /* control characters in argument strings */
464 #define CTLESC '\201' /* escape next character */
465 #define CTLVAR '\202' /* variable defn */
466 #define CTLENDVAR '\203'
467 #define CTLBACKQ '\204'
468 #define CTLQUOTE 01 /* ored with CTLBACKQ code if in quotes */
469 /* CTLBACKQ | CTLQUOTE == '\205' */
470 #define CTLARI '\206' /* arithmetic expression */
471 #define CTLENDARI '\207'
472 #define CTLQUOTEMARK '\210'
474 /* variable substitution byte (follows CTLVAR) */
475 #define VSTYPE 0x0f /* type of variable substitution */
476 #define VSNUL 0x10 /* colon--treat the empty string as unset */
477 #define VSQUOTE 0x80 /* inside double quotes--suppress splitting */
479 /* values of VSTYPE field */
480 #define VSNORMAL 0x1 /* normal variable: $var or ${var} */
481 #define VSMINUS 0x2 /* ${var-text} */
482 #define VSPLUS 0x3 /* ${var+text} */
483 #define VSQUESTION 0x4 /* ${var?message} */
484 #define VSASSIGN 0x5 /* ${var=text} */
485 #define VSTRIMRIGHT 0x6 /* ${var%pattern} */
486 #define VSTRIMRIGHTMAX 0x7 /* ${var%%pattern} */
487 #define VSTRIMLEFT 0x8 /* ${var#pattern} */
488 #define VSTRIMLEFTMAX 0x9 /* ${var##pattern} */
489 #define VSLENGTH 0xa /* ${#var} */
490 #if ENABLE_ASH_BASH_COMPAT
491 #define VSSUBSTR 0xc /* ${var:position:length} */
492 #define VSREPLACE 0xd /* ${var/pattern/replacement} */
493 #define VSREPLACEALL 0xe /* ${var//pattern/replacement} */
496 static const char dolatstr[] ALIGN1 = {
497 CTLVAR, VSNORMAL|VSQUOTE, '@', '=', '\0'
517 #if ENABLE_ASH_BASH_COMPAT
534 smallint type; /* Nxxxx */
537 union node *redirect;
542 smallint pipe_backgnd;
543 struct nodelist *cmdlist;
549 union node *redirect;
562 union node *elsepart;
589 struct nodelist *backquote;
592 /* nfile and ndup layout must match!
593 * NTOFD (>&fdnum) uses ndup structure, but we may discover mid-flight
594 * that it is actually NTO2 (>&file), and change its type.
611 char *_unused_expfname;
630 struct nredir nredir;
631 struct nbinary nbinary;
635 struct nclist nclist;
644 * NODE_EOF is returned by parsecmd when it encounters an end of file.
645 * It must be distinct from NULL.
647 #define NODE_EOF ((union node *) -1L)
650 struct nodelist *next;
663 freefunc(struct funcnode *f)
665 if (f && --f->count < 0)
670 /* ============ Debugging output */
674 static FILE *tracefile;
677 trace_printf(const char *fmt, ...)
684 fprintf(tracefile, "%u ", (int) time(NULL));
686 fprintf(tracefile, "[%u] ", (int) getpid());
688 fprintf(tracefile, "pending s:%d i:%d(supp:%d) ", pendingsig, intpending, suppressint);
690 vfprintf(tracefile, fmt, va);
695 trace_vprintf(const char *fmt, va_list va)
700 fprintf(tracefile, "%u ", (int) time(NULL));
702 fprintf(tracefile, "[%u] ", (int) getpid());
704 fprintf(tracefile, "pending s:%d i:%d(supp:%d) ", pendingsig, intpending, suppressint);
705 vfprintf(tracefile, fmt, va);
709 trace_puts(const char *s)
717 trace_puts_quoted(char *s)
724 putc('"', tracefile);
725 for (p = s; *p; p++) {
727 case '\n': c = 'n'; goto backslash;
728 case '\t': c = 't'; goto backslash;
729 case '\r': c = 'r'; goto backslash;
730 case '"': c = '"'; goto backslash;
731 case '\\': c = '\\'; goto backslash;
732 case CTLESC: c = 'e'; goto backslash;
733 case CTLVAR: c = 'v'; goto backslash;
734 case CTLVAR+CTLQUOTE: c = 'V'; goto backslash;
735 case CTLBACKQ: c = 'q'; goto backslash;
736 case CTLBACKQ+CTLQUOTE: c = 'Q'; goto backslash;
738 putc('\\', tracefile);
742 if (*p >= ' ' && *p <= '~')
745 putc('\\', tracefile);
746 putc(*p >> 6 & 03, tracefile);
747 putc(*p >> 3 & 07, tracefile);
748 putc(*p & 07, tracefile);
753 putc('"', tracefile);
757 trace_puts_args(char **ap)
764 trace_puts_quoted(*ap);
766 putc('\n', tracefile);
769 putc(' ', tracefile);
784 /* leave open because libedit might be using it */
787 strcpy(s, "./trace");
789 if (!freopen(s, "a", tracefile)) {
790 fprintf(stderr, "Can't re-open %s\n", s);
795 tracefile = fopen(s, "a");
796 if (tracefile == NULL) {
797 fprintf(stderr, "Can't open %s\n", s);
803 flags = fcntl(fileno(tracefile), F_GETFL);
805 fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND);
807 setlinebuf(tracefile);
808 fputs("\nTracing started.\n", tracefile);
812 indent(int amount, char *pfx, FILE *fp)
816 for (i = 0; i < amount; i++) {
817 if (pfx && i == amount - 1)
823 /* little circular references here... */
824 static void shtree(union node *n, int ind, char *pfx, FILE *fp);
827 sharg(union node *arg, FILE *fp)
830 struct nodelist *bqlist;
833 if (arg->type != NARG) {
834 out1fmt("<node type %d>\n", arg->type);
837 bqlist = arg->narg.backquote;
838 for (p = arg->narg.text; *p; p++) {
847 if (subtype == VSLENGTH)
856 switch (subtype & VSTYPE) {
889 out1fmt("<subtype %d>", subtype);
896 case CTLBACKQ|CTLQUOTE:
899 shtree(bqlist->n, -1, NULL, fp);
910 shcmd(union node *cmd, FILE *fp)
918 for (np = cmd->ncmd.args; np; np = np->narg.next) {
924 for (np = cmd->ncmd.redirect; np; np = np->nfile.next) {
928 switch (np->nfile.type) {
929 case NTO: s = ">>"+1; dftfd = 1; break;
930 case NCLOBBER: s = ">|"; dftfd = 1; break;
931 case NAPPEND: s = ">>"; dftfd = 1; break;
932 #if ENABLE_ASH_BASH_COMPAT
935 case NTOFD: s = ">&"; dftfd = 1; break;
936 case NFROM: s = "<"; break;
937 case NFROMFD: s = "<&"; break;
938 case NFROMTO: s = "<>"; break;
939 default: s = "*error*"; break;
941 if (np->nfile.fd != dftfd)
942 fprintf(fp, "%d", np->nfile.fd);
944 if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) {
945 fprintf(fp, "%d", np->ndup.dupfd);
947 sharg(np->nfile.fname, fp);
954 shtree(union node *n, int ind, char *pfx, FILE *fp)
962 indent(ind, pfx, fp);
979 shtree(n->nbinary.ch1, ind, NULL, fp);
982 shtree(n->nbinary.ch2, ind, NULL, fp);
990 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
995 if (n->npipe.pipe_backgnd)
1001 fprintf(fp, "<node type %d>", n->type);
1009 showtree(union node *n)
1011 trace_puts("showtree called\n");
1012 shtree(n, 1, NULL, stderr);
1018 /* ============ Parser data */
1021 * ash_vmsg() needs parsefile->fd, hence parsefile definition is moved up.
1024 struct strlist *next;
1031 struct strpush *prev; /* preceding string on stack */
1033 int prev_left_in_line;
1034 #if ENABLE_ASH_ALIAS
1035 struct alias *ap; /* if push was associated with an alias */
1037 char *string; /* remember the string since it may change */
1041 struct parsefile *prev; /* preceding file on stack */
1042 int linno; /* current line */
1043 int fd; /* file descriptor (or -1 if string) */
1044 int left_in_line; /* number of chars left in this line */
1045 int left_in_buffer; /* number of chars left in this buffer past the line */
1046 char *next_to_pgetc; /* next char in buffer */
1047 char *buf; /* input buffer */
1048 struct strpush *strpush; /* for pushing strings at this level */
1049 struct strpush basestrpush; /* so pushing one is fast */
1052 static struct parsefile basepf; /* top level input file */
1053 static struct parsefile *g_parsefile = &basepf; /* current input file */
1054 static int startlinno; /* line # where last token started */
1055 static char *commandname; /* currently executing command */
1056 static struct strlist *cmdenviron; /* environment for builtin command */
1057 static uint8_t exitstatus; /* exit status of last command */
1060 /* ============ Message printing */
1063 ash_vmsg(const char *msg, va_list ap)
1065 fprintf(stderr, "%s: ", arg0);
1067 if (strcmp(arg0, commandname))
1068 fprintf(stderr, "%s: ", commandname);
1069 if (!iflag || g_parsefile->fd)
1070 fprintf(stderr, "line %d: ", startlinno);
1072 vfprintf(stderr, msg, ap);
1073 outcslow('\n', stderr);
1077 * Exverror is called to raise the error exception. If the second argument
1078 * is not NULL then error prints an error message using printf style
1079 * formatting. It then raises the error exception.
1081 static void ash_vmsg_and_raise(int, const char *, va_list) NORETURN;
1083 ash_vmsg_and_raise(int cond, const char *msg, va_list ap)
1087 TRACE(("ash_vmsg_and_raise(%d, \"", cond));
1089 TRACE(("\") pid=%d\n", getpid()));
1091 TRACE(("ash_vmsg_and_raise(%d, NULL) pid=%d\n", cond, getpid()));
1096 flush_stdout_stderr();
1097 raise_exception(cond);
1101 static void ash_msg_and_raise_error(const char *, ...) NORETURN;
1103 ash_msg_and_raise_error(const char *msg, ...)
1108 ash_vmsg_and_raise(EXERROR, msg, ap);
1113 static void raise_error_syntax(const char *) NORETURN;
1115 raise_error_syntax(const char *msg)
1117 ash_msg_and_raise_error("syntax error: %s", msg);
1121 static void ash_msg_and_raise(int, const char *, ...) NORETURN;
1123 ash_msg_and_raise(int cond, const char *msg, ...)
1128 ash_vmsg_and_raise(cond, msg, ap);
1134 * error/warning routines for external builtins
1137 ash_msg(const char *fmt, ...)
1147 * Return a string describing an error. The returned string may be a
1148 * pointer to a static buffer that will be overwritten on the next call.
1149 * Action describes the operation that got the error.
1152 errmsg(int e, const char *em)
1154 if (e == ENOENT || e == ENOTDIR) {
1161 /* ============ Memory allocation */
1164 * It appears that grabstackstr() will barf with such alignments
1165 * because stalloc() will return a string allocated in a new stackblock.
1167 #define SHELL_ALIGN(nbytes) (((nbytes) + SHELL_SIZE) & ~SHELL_SIZE)
1169 /* Most machines require the value returned from malloc to be aligned
1170 * in some way. The following macro will get this right
1171 * on many machines. */
1172 SHELL_SIZE = sizeof(union {int i; char *cp; double d; }) - 1,
1173 /* Minimum size of a block */
1174 MINSIZE = SHELL_ALIGN(504),
1177 struct stack_block {
1178 struct stack_block *prev;
1179 char space[MINSIZE];
1183 struct stack_block *stackp;
1186 struct stackmark *marknext;
1190 struct globals_memstack {
1191 struct stack_block *g_stackp; // = &stackbase;
1192 struct stackmark *markp;
1193 char *g_stacknxt; // = stackbase.space;
1194 char *sstrend; // = stackbase.space + MINSIZE;
1195 size_t g_stacknleft; // = MINSIZE;
1196 int herefd; // = -1;
1197 struct stack_block stackbase;
1199 extern struct globals_memstack *const ash_ptr_to_globals_memstack;
1200 #define G_memstack (*ash_ptr_to_globals_memstack)
1201 #define g_stackp (G_memstack.g_stackp )
1202 #define markp (G_memstack.markp )
1203 #define g_stacknxt (G_memstack.g_stacknxt )
1204 #define sstrend (G_memstack.sstrend )
1205 #define g_stacknleft (G_memstack.g_stacknleft)
1206 #define herefd (G_memstack.herefd )
1207 #define stackbase (G_memstack.stackbase )
1208 #define INIT_G_memstack() do { \
1209 (*(struct globals_memstack**)&ash_ptr_to_globals_memstack) = xzalloc(sizeof(G_memstack)); \
1211 g_stackp = &stackbase; \
1212 g_stacknxt = stackbase.space; \
1213 g_stacknleft = MINSIZE; \
1214 sstrend = stackbase.space + MINSIZE; \
1218 #define stackblock() ((void *)g_stacknxt)
1219 #define stackblocksize() g_stacknleft
1223 ckrealloc(void * p, size_t nbytes)
1225 p = realloc(p, nbytes);
1227 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1232 ckmalloc(size_t nbytes)
1234 return ckrealloc(NULL, nbytes);
1238 ckzalloc(size_t nbytes)
1240 return memset(ckmalloc(nbytes), 0, nbytes);
1244 * Make a copy of a string in safe storage.
1247 ckstrdup(const char *s)
1249 char *p = strdup(s);
1251 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1256 * Parse trees for commands are allocated in lifo order, so we use a stack
1257 * to make this more efficient, and also to avoid all sorts of exception
1258 * handling code to handle interrupts in the middle of a parse.
1260 * The size 504 was chosen because the Ultrix malloc handles that size
1264 stalloc(size_t nbytes)
1269 aligned = SHELL_ALIGN(nbytes);
1270 if (aligned > g_stacknleft) {
1273 struct stack_block *sp;
1275 blocksize = aligned;
1276 if (blocksize < MINSIZE)
1277 blocksize = MINSIZE;
1278 len = sizeof(struct stack_block) - MINSIZE + blocksize;
1279 if (len < blocksize)
1280 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1283 sp->prev = g_stackp;
1284 g_stacknxt = sp->space;
1285 g_stacknleft = blocksize;
1286 sstrend = g_stacknxt + blocksize;
1291 g_stacknxt += aligned;
1292 g_stacknleft -= aligned;
1297 stzalloc(size_t nbytes)
1299 return memset(stalloc(nbytes), 0, nbytes);
1306 if (!p || (g_stacknxt < (char *)p) || ((char *)p < g_stackp->space)) {
1307 write(STDERR_FILENO, "stunalloc\n", 10);
1311 g_stacknleft += g_stacknxt - (char *)p;
1316 * Like strdup but works with the ash stack.
1319 ststrdup(const char *p)
1321 size_t len = strlen(p) + 1;
1322 return memcpy(stalloc(len), p, len);
1326 setstackmark(struct stackmark *mark)
1328 mark->stackp = g_stackp;
1329 mark->stacknxt = g_stacknxt;
1330 mark->stacknleft = g_stacknleft;
1331 mark->marknext = markp;
1336 popstackmark(struct stackmark *mark)
1338 struct stack_block *sp;
1344 markp = mark->marknext;
1345 while (g_stackp != mark->stackp) {
1347 g_stackp = sp->prev;
1350 g_stacknxt = mark->stacknxt;
1351 g_stacknleft = mark->stacknleft;
1352 sstrend = mark->stacknxt + mark->stacknleft;
1357 * When the parser reads in a string, it wants to stick the string on the
1358 * stack and only adjust the stack pointer when it knows how big the
1359 * string is. Stackblock (defined in stack.h) returns a pointer to a block
1360 * of space on top of the stack and stackblocklen returns the length of
1361 * this block. Growstackblock will grow this space by at least one byte,
1362 * possibly moving it (like realloc). Grabstackblock actually allocates the
1363 * part of the block that has been used.
1366 growstackblock(void)
1370 newlen = g_stacknleft * 2;
1371 if (newlen < g_stacknleft)
1372 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1376 if (g_stacknxt == g_stackp->space && g_stackp != &stackbase) {
1377 struct stack_block *oldstackp;
1378 struct stackmark *xmark;
1379 struct stack_block *sp;
1380 struct stack_block *prevstackp;
1384 oldstackp = g_stackp;
1386 prevstackp = sp->prev;
1387 grosslen = newlen + sizeof(struct stack_block) - MINSIZE;
1388 sp = ckrealloc(sp, grosslen);
1389 sp->prev = prevstackp;
1391 g_stacknxt = sp->space;
1392 g_stacknleft = newlen;
1393 sstrend = sp->space + newlen;
1396 * Stack marks pointing to the start of the old block
1397 * must be relocated to point to the new block
1400 while (xmark != NULL && xmark->stackp == oldstackp) {
1401 xmark->stackp = g_stackp;
1402 xmark->stacknxt = g_stacknxt;
1403 xmark->stacknleft = g_stacknleft;
1404 xmark = xmark->marknext;
1408 char *oldspace = g_stacknxt;
1409 size_t oldlen = g_stacknleft;
1410 char *p = stalloc(newlen);
1412 /* free the space we just allocated */
1413 g_stacknxt = memcpy(p, oldspace, oldlen);
1414 g_stacknleft += newlen;
1419 grabstackblock(size_t len)
1421 len = SHELL_ALIGN(len);
1423 g_stacknleft -= len;
1427 * The following routines are somewhat easier to use than the above.
1428 * The user declares a variable of type STACKSTR, which may be declared
1429 * to be a register. The macro STARTSTACKSTR initializes things. Then
1430 * the user uses the macro STPUTC to add characters to the string. In
1431 * effect, STPUTC(c, p) is the same as *p++ = c except that the stack is
1432 * grown as necessary. When the user is done, she can just leave the
1433 * string there and refer to it using stackblock(). Or she can allocate
1434 * the space for it using grabstackstr(). If it is necessary to allow
1435 * someone else to use the stack temporarily and then continue to grow
1436 * the string, the user should use grabstack to allocate the space, and
1437 * then call ungrabstr(p) to return to the previous mode of operation.
1439 * USTPUTC is like STPUTC except that it doesn't check for overflow.
1440 * CHECKSTACKSPACE can be called before USTPUTC to ensure that there
1441 * is space for at least one character.
1446 size_t len = stackblocksize();
1447 if (herefd >= 0 && len >= 1024) {
1448 full_write(herefd, stackblock(), len);
1449 return stackblock();
1452 return (char *)stackblock() + len;
1456 * Called from CHECKSTRSPACE.
1459 makestrspace(size_t newlen, char *p)
1461 size_t len = p - g_stacknxt;
1462 size_t size = stackblocksize();
1467 size = stackblocksize();
1469 if (nleft >= newlen)
1473 return (char *)stackblock() + len;
1477 stack_nputstr(const char *s, size_t n, char *p)
1479 p = makestrspace(n, p);
1480 p = (char *)memcpy(p, s, n) + n;
1485 stack_putstr(const char *s, char *p)
1487 return stack_nputstr(s, strlen(s), p);
1491 _STPUTC(int c, char *p)
1499 #define STARTSTACKSTR(p) ((p) = stackblock())
1500 #define STPUTC(c, p) ((p) = _STPUTC((c), (p)))
1501 #define CHECKSTRSPACE(n, p) do { \
1504 size_t m = sstrend - q; \
1506 (p) = makestrspace(l, q); \
1508 #define USTPUTC(c, p) (*(p)++ = (c))
1509 #define STACKSTRNUL(p) do { \
1510 if ((p) == sstrend) \
1511 (p) = growstackstr(); \
1514 #define STUNPUTC(p) (--(p))
1515 #define STTOPC(p) ((p)[-1])
1516 #define STADJUST(amount, p) ((p) += (amount))
1518 #define grabstackstr(p) stalloc((char *)(p) - (char *)stackblock())
1519 #define ungrabstackstr(s, p) stunalloc(s)
1520 #define stackstrend() ((void *)sstrend)
1523 /* ============ String helpers */
1526 * prefix -- see if pfx is a prefix of string.
1529 prefix(const char *string, const char *pfx)
1532 if (*pfx++ != *string++)
1535 return (char *) string;
1539 * Check for a valid number. This should be elsewhere.
1542 is_number(const char *p)
1547 } while (*++p != '\0');
1552 * Convert a string of digits to an integer, printing an error message on
1556 number(const char *s)
1559 ash_msg_and_raise_error(illnum, s);
1564 * Produce a possibly single quoted string suitable as input to the shell.
1565 * The return string is allocated on the stack.
1568 single_quote(const char *s)
1578 len = strchrnul(s, '\'') - s;
1580 q = p = makestrspace(len + 3, p);
1583 q = (char *)memcpy(q, s, len) + len;
1589 len = strspn(s, "'");
1593 q = p = makestrspace(len + 3, p);
1596 q = (char *)memcpy(q, s, len) + len;
1605 return stackblock();
1609 /* ============ nextopt */
1611 static char **argptr; /* argument list for builtin commands */
1612 static char *optionarg; /* set by nextopt (like getopt) */
1613 static char *optptr; /* used by nextopt */
1616 * XXX - should get rid of. Have all builtins use getopt(3).
1617 * The library getopt must have the BSD extension static variable
1618 * "optreset", otherwise it can't be used within the shell safely.
1620 * Standard option processing (a la getopt) for builtin routines.
1621 * The only argument that is passed to nextopt is the option string;
1622 * the other arguments are unnecessary. It returns the character,
1623 * or '\0' on end of input.
1626 nextopt(const char *optstring)
1633 if (p == NULL || *p == '\0') {
1634 /* We ate entire "-param", take next one */
1640 if (*++p == '\0') /* just "-" ? */
1643 if (LONE_DASH(p)) /* "--" ? */
1645 /* p => next "-param" */
1647 /* p => some option char in the middle of a "-param" */
1649 for (q = optstring; *q != c;) {
1651 ash_msg_and_raise_error("illegal option -%c", c);
1659 ash_msg_and_raise_error("no arg for -%c option", c);
1669 /* ============ Shell variables */
1672 * The parsefile structure pointed to by the global variable parsefile
1673 * contains information about the current file being read.
1676 int nparam; /* # of positional parameters (without $0) */
1677 #if ENABLE_ASH_GETOPTS
1678 int optind; /* next parameter to be processed by getopts */
1679 int optoff; /* used by getopts */
1681 unsigned char malloced; /* if parameter list dynamically allocated */
1682 char **p; /* parameter list */
1686 * Free the list of positional parameters.
1689 freeparam(volatile struct shparam *param)
1691 if (param->malloced) {
1693 ap = ap1 = param->p;
1700 #if ENABLE_ASH_GETOPTS
1701 static void FAST_FUNC getoptsreset(const char *value);
1705 struct var *next; /* next entry in hash list */
1706 int flags; /* flags are defined above */
1707 const char *text; /* name=value */
1708 void (*func)(const char *) FAST_FUNC; /* function to be called when */
1709 /* the variable gets set/unset */
1713 struct localvar *next; /* next local variable in list */
1714 struct var *vp; /* the variable that was made local */
1715 int flags; /* saved flags */
1716 const char *text; /* saved text */
1720 #define VEXPORT 0x01 /* variable is exported */
1721 #define VREADONLY 0x02 /* variable cannot be modified */
1722 #define VSTRFIXED 0x04 /* variable struct is statically allocated */
1723 #define VTEXTFIXED 0x08 /* text is statically allocated */
1724 #define VSTACK 0x10 /* text is allocated on the stack */
1725 #define VUNSET 0x20 /* the variable is not set */
1726 #define VNOFUNC 0x40 /* don't call the callback function */
1727 #define VNOSET 0x80 /* do not set variable - just readonly test */
1728 #define VNOSAVE 0x100 /* when text is on the heap before setvareq */
1729 #if ENABLE_ASH_RANDOM_SUPPORT
1730 # define VDYNAMIC 0x200 /* dynamic variable */
1736 static const char defifsvar[] ALIGN1 = "IFS= \t\n";
1737 #define defifs (defifsvar + 4)
1739 static const char defifs[] ALIGN1 = " \t\n";
1743 /* Need to be before varinit_data[] */
1744 #if ENABLE_LOCALE_SUPPORT
1745 static void FAST_FUNC
1746 change_lc_all(const char *value)
1748 if (value && *value != '\0')
1749 setlocale(LC_ALL, value);
1751 static void FAST_FUNC
1752 change_lc_ctype(const char *value)
1754 if (value && *value != '\0')
1755 setlocale(LC_CTYPE, value);
1759 static void chkmail(void);
1760 static void changemail(const char *) FAST_FUNC;
1762 static void changepath(const char *) FAST_FUNC;
1763 #if ENABLE_ASH_RANDOM_SUPPORT
1764 static void change_random(const char *) FAST_FUNC;
1767 static const struct {
1770 void (*func)(const char *) FAST_FUNC;
1771 } varinit_data[] = {
1773 { VSTRFIXED|VTEXTFIXED , defifsvar , NULL },
1775 { VSTRFIXED|VTEXTFIXED|VUNSET, "IFS\0" , NULL },
1778 { VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL\0" , changemail },
1779 { VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH\0", changemail },
1781 { VSTRFIXED|VTEXTFIXED , bb_PATH_root_path, changepath },
1782 { VSTRFIXED|VTEXTFIXED , "PS1=$ " , NULL },
1783 { VSTRFIXED|VTEXTFIXED , "PS2=> " , NULL },
1784 { VSTRFIXED|VTEXTFIXED , "PS4=+ " , NULL },
1785 #if ENABLE_ASH_GETOPTS
1786 { VSTRFIXED|VTEXTFIXED , "OPTIND=1" , getoptsreset },
1788 #if ENABLE_ASH_RANDOM_SUPPORT
1789 { VSTRFIXED|VTEXTFIXED|VUNSET|VDYNAMIC, "RANDOM\0", change_random },
1791 #if ENABLE_LOCALE_SUPPORT
1792 { VSTRFIXED|VTEXTFIXED|VUNSET, "LC_ALL\0" , change_lc_all },
1793 { VSTRFIXED|VTEXTFIXED|VUNSET, "LC_CTYPE\0", change_lc_ctype },
1795 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
1796 { VSTRFIXED|VTEXTFIXED|VUNSET, "HISTFILE\0", NULL },
1802 struct globals_var {
1803 struct shparam shellparam; /* $@ current positional parameters */
1804 struct redirtab *redirlist;
1806 int preverrout_fd; /* save fd2 before print debug if xflag is set. */
1807 struct var *vartab[VTABSIZE];
1808 struct var varinit[ARRAY_SIZE(varinit_data)];
1810 extern struct globals_var *const ash_ptr_to_globals_var;
1811 #define G_var (*ash_ptr_to_globals_var)
1812 #define shellparam (G_var.shellparam )
1813 //#define redirlist (G_var.redirlist )
1814 #define g_nullredirs (G_var.g_nullredirs )
1815 #define preverrout_fd (G_var.preverrout_fd)
1816 #define vartab (G_var.vartab )
1817 #define varinit (G_var.varinit )
1818 #define INIT_G_var() do { \
1820 (*(struct globals_var**)&ash_ptr_to_globals_var) = xzalloc(sizeof(G_var)); \
1822 for (i = 0; i < ARRAY_SIZE(varinit_data); i++) { \
1823 varinit[i].flags = varinit_data[i].flags; \
1824 varinit[i].text = varinit_data[i].text; \
1825 varinit[i].func = varinit_data[i].func; \
1829 #define vifs varinit[0]
1831 # define vmail (&vifs)[1]
1832 # define vmpath (&vmail)[1]
1833 # define vpath (&vmpath)[1]
1835 # define vpath (&vifs)[1]
1837 #define vps1 (&vpath)[1]
1838 #define vps2 (&vps1)[1]
1839 #define vps4 (&vps2)[1]
1840 #if ENABLE_ASH_GETOPTS
1841 # define voptind (&vps4)[1]
1842 # if ENABLE_ASH_RANDOM_SUPPORT
1843 # define vrandom (&voptind)[1]
1846 # if ENABLE_ASH_RANDOM_SUPPORT
1847 # define vrandom (&vps4)[1]
1852 * The following macros access the values of the above variables.
1853 * They have to skip over the name. They return the null string
1854 * for unset variables.
1856 #define ifsval() (vifs.text + 4)
1857 #define ifsset() ((vifs.flags & VUNSET) == 0)
1859 # define mailval() (vmail.text + 5)
1860 # define mpathval() (vmpath.text + 9)
1861 # define mpathset() ((vmpath.flags & VUNSET) == 0)
1863 #define pathval() (vpath.text + 5)
1864 #define ps1val() (vps1.text + 4)
1865 #define ps2val() (vps2.text + 4)
1866 #define ps4val() (vps4.text + 4)
1867 #if ENABLE_ASH_GETOPTS
1868 # define optindval() (voptind.text + 7)
1872 #define is_name(c) ((c) == '_' || isalpha((unsigned char)(c)))
1873 #define is_in_name(c) ((c) == '_' || isalnum((unsigned char)(c)))
1875 #if ENABLE_ASH_GETOPTS
1876 static void FAST_FUNC
1877 getoptsreset(const char *value)
1879 shellparam.optind = number(value);
1880 shellparam.optoff = -1;
1885 * Return of a legal variable name (a letter or underscore followed by zero or
1886 * more letters, underscores, and digits).
1889 endofname(const char *name)
1897 if (!is_in_name(*p))
1904 * Compares two strings up to the first = or '\0'. The first
1905 * string must be terminated by '='; the second may be terminated by
1906 * either '=' or '\0'.
1909 varcmp(const char *p, const char *q)
1913 while ((c = *p) == (d = *q)) {
1928 varequal(const char *a, const char *b)
1930 return !varcmp(a, b);
1934 * Find the appropriate entry in the hash table from the name.
1936 static struct var **
1937 hashvar(const char *p)
1941 hashval = ((unsigned char) *p) << 4;
1942 while (*p && *p != '=')
1943 hashval += (unsigned char) *p++;
1944 return &vartab[hashval % VTABSIZE];
1948 vpcmp(const void *a, const void *b)
1950 return varcmp(*(const char **)a, *(const char **)b);
1954 * This routine initializes the builtin variables.
1964 * PS1 depends on uid
1966 #if ENABLE_FEATURE_EDITING && ENABLE_FEATURE_EDITING_FANCY_PROMPT
1967 vps1.text = "PS1=\\w \\$ ";
1970 vps1.text = "PS1=# ";
1973 end = vp + ARRAY_SIZE(varinit);
1975 vpp = hashvar(vp->text);
1978 } while (++vp < end);
1981 static struct var **
1982 findvar(struct var **vpp, const char *name)
1984 for (; *vpp; vpp = &(*vpp)->next) {
1985 if (varequal((*vpp)->text, name)) {
1993 * Find the value of a variable. Returns NULL if not set.
1996 lookupvar(const char *name)
2000 v = *findvar(hashvar(name), name);
2002 #if ENABLE_ASH_RANDOM_SUPPORT
2004 * Dynamic variables are implemented roughly the same way they are
2005 * in bash. Namely, they're "special" so long as they aren't unset.
2006 * As soon as they're unset, they're no longer dynamic, and dynamic
2007 * lookup will no longer happen at that point. -- PFM.
2009 if ((v->flags & VDYNAMIC))
2012 if (!(v->flags & VUNSET))
2013 return strchrnul(v->text, '=') + 1;
2019 * Search the environment of a builtin command.
2022 bltinlookup(const char *name)
2026 for (sp = cmdenviron; sp; sp = sp->next) {
2027 if (varequal(sp->text, name))
2028 return strchrnul(sp->text, '=') + 1;
2030 return lookupvar(name);
2034 * Same as setvar except that the variable and value are passed in
2035 * the first argument as name=value. Since the first argument will
2036 * be actually stored in the table, it should not be a string that
2038 * Called with interrupts off.
2041 setvareq(char *s, int flags)
2043 struct var *vp, **vpp;
2046 flags |= (VEXPORT & (((unsigned) (1 - aflag)) - 1));
2047 vp = *findvar(vpp, s);
2049 if ((vp->flags & (VREADONLY|VDYNAMIC)) == VREADONLY) {
2052 if (flags & VNOSAVE)
2055 ash_msg_and_raise_error("%.*s: is read only", strchrnul(n, '=') - n, n);
2061 if (vp->func && (flags & VNOFUNC) == 0)
2062 (*vp->func)(strchrnul(s, '=') + 1);
2064 if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
2065 free((char*)vp->text);
2067 flags |= vp->flags & ~(VTEXTFIXED|VSTACK|VNOSAVE|VUNSET);
2072 vp = ckzalloc(sizeof(*vp));
2074 /*vp->func = NULL; - ckzalloc did it */
2077 if (!(flags & (VTEXTFIXED|VSTACK|VNOSAVE)))
2084 * Set the value of a variable. The flags argument is ored with the
2085 * flags of the variable. If val is NULL, the variable is unset.
2088 setvar(const char *name, const char *val, int flags)
2095 q = endofname(name);
2096 p = strchrnul(q, '=');
2098 if (!namelen || p != q)
2099 ash_msg_and_raise_error("%.*s: bad variable name", namelen, name);
2104 vallen = strlen(val);
2107 nameeq = ckmalloc(namelen + vallen + 2);
2108 p = (char *)memcpy(nameeq, name, namelen) + namelen;
2111 p = (char *)memcpy(p, val, vallen) + vallen;
2114 setvareq(nameeq, flags | VNOSAVE);
2118 #if ENABLE_ASH_GETOPTS
2120 * Safe version of setvar, returns 1 on success 0 on failure.
2123 setvarsafe(const char *name, const char *val, int flags)
2126 volatile int saveint;
2127 struct jmploc *volatile savehandler = exception_handler;
2128 struct jmploc jmploc;
2131 if (setjmp(jmploc.loc))
2134 exception_handler = &jmploc;
2135 setvar(name, val, flags);
2138 exception_handler = savehandler;
2139 RESTORE_INT(saveint);
2145 * Unset the specified variable.
2148 unsetvar(const char *s)
2154 vpp = findvar(hashvar(s), s);
2158 int flags = vp->flags;
2161 if (flags & VREADONLY)
2163 #if ENABLE_ASH_RANDOM_SUPPORT
2164 vp->flags &= ~VDYNAMIC;
2168 if ((flags & VSTRFIXED) == 0) {
2170 if ((flags & (VTEXTFIXED|VSTACK)) == 0)
2171 free((char*)vp->text);
2177 vp->flags &= ~VEXPORT;
2187 * Process a linked list of variable assignments.
2190 listsetvar(struct strlist *list_set_var, int flags)
2192 struct strlist *lp = list_set_var;
2198 setvareq(lp->text, flags);
2205 * Generate a list of variables satisfying the given conditions.
2208 listvars(int on, int off, char ***end)
2219 for (vp = *vpp; vp; vp = vp->next) {
2220 if ((vp->flags & mask) == on) {
2221 if (ep == stackstrend())
2222 ep = growstackstr();
2223 *ep++ = (char *) vp->text;
2226 } while (++vpp < vartab + VTABSIZE);
2227 if (ep == stackstrend())
2228 ep = growstackstr();
2232 return grabstackstr(ep);
2236 /* ============ Path search helper
2238 * The variable path (passed by reference) should be set to the start
2239 * of the path before the first call; path_advance will update
2240 * this value as it proceeds. Successive calls to path_advance will return
2241 * the possible path expansions in sequence. If an option (indicated by
2242 * a percent sign) appears in the path entry then the global variable
2243 * pathopt will be set to point to it; otherwise pathopt will be set to
2246 static const char *pathopt; /* set by path_advance */
2249 path_advance(const char **path, const char *name)
2259 for (p = start; *p && *p != ':' && *p != '%'; p++)
2261 len = p - start + strlen(name) + 2; /* "2" is for '/' and '\0' */
2262 while (stackblocksize() < len)
2266 memcpy(q, start, p - start);
2274 while (*p && *p != ':')
2281 return stalloc(len);
2285 /* ============ Prompt */
2287 static smallint doprompt; /* if set, prompt the user */
2288 static smallint needprompt; /* true if interactive and at start of line */
2290 #if ENABLE_FEATURE_EDITING
2291 static line_input_t *line_input_state;
2292 static const char *cmdedit_prompt;
2294 putprompt(const char *s)
2296 if (ENABLE_ASH_EXPAND_PRMT) {
2297 free((char*)cmdedit_prompt);
2298 cmdedit_prompt = ckstrdup(s);
2305 putprompt(const char *s)
2311 #if ENABLE_ASH_EXPAND_PRMT
2312 /* expandstr() needs parsing machinery, so it is far away ahead... */
2313 static const char *expandstr(const char *ps);
2315 #define expandstr(s) s
2319 setprompt(int whichprompt)
2322 #if ENABLE_ASH_EXPAND_PRMT
2323 struct stackmark smark;
2328 switch (whichprompt) {
2338 #if ENABLE_ASH_EXPAND_PRMT
2339 setstackmark(&smark);
2340 stalloc(stackblocksize());
2342 putprompt(expandstr(prompt));
2343 #if ENABLE_ASH_EXPAND_PRMT
2344 popstackmark(&smark);
2349 /* ============ The cd and pwd commands */
2351 #define CD_PHYSICAL 1
2354 static int docd(const char *, int);
2363 while ((i = nextopt("LP"))) {
2365 flags ^= CD_PHYSICAL;
2374 * Update curdir (the name of the current directory) in response to a
2378 updatepwd(const char *dir)
2385 cdcomppath = ststrdup(dir);
2388 if (curdir == nullstr)
2390 new = stack_putstr(curdir, new);
2392 new = makestrspace(strlen(dir) + 2, new);
2393 lim = (char *)stackblock() + 1;
2397 if (new > lim && *lim == '/')
2402 if (dir[1] == '/' && dir[2] != '/') {
2408 p = strtok(cdcomppath, "/");
2412 if (p[1] == '.' && p[2] == '\0') {
2424 new = stack_putstr(p, new);
2432 return stackblock();
2436 * Find out what the current directory is. If we already know the current
2437 * directory, this routine returns immediately.
2442 char *dir = getcwd(NULL, 0); /* huh, using glibc extension? */
2443 return dir ? dir : nullstr;
2447 setpwd(const char *val, int setold)
2451 oldcur = dir = curdir;
2454 setvar("OLDPWD", oldcur, VEXPORT);
2457 if (physdir != nullstr) {
2458 if (physdir != oldcur)
2462 if (oldcur == val || !val) {
2468 dir = ckstrdup(val);
2469 if (oldcur != dir && oldcur != nullstr) {
2474 setvar("PWD", dir, VEXPORT);
2477 static void hashcd(void);
2480 * Actually do the chdir. We also call hashcd to let the routines in exec.c
2481 * know that the current directory has changed.
2484 docd(const char *dest, int flags)
2486 const char *dir = 0;
2489 TRACE(("docd(\"%s\", %d) called\n", dest, flags));
2492 if (!(flags & CD_PHYSICAL)) {
2493 dir = updatepwd(dest);
2507 static int FAST_FUNC
2508 cdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
2520 dest = bltinlookup(homestr);
2521 else if (LONE_DASH(dest)) {
2522 dest = bltinlookup("OLDPWD");
2544 path = bltinlookup("CDPATH");
2553 p = path_advance(&path, dest);
2554 if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
2558 if (!docd(p, flags))
2563 ash_msg_and_raise_error("can't cd to %s", dest);
2566 if (flags & CD_PRINT)
2567 out1fmt(snlfmt, curdir);
2571 static int FAST_FUNC
2572 pwdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
2575 const char *dir = curdir;
2579 if (physdir == nullstr)
2583 out1fmt(snlfmt, dir);
2588 /* ============ ... */
2591 #define IBUFSIZ COMMON_BUFSIZE
2592 /* buffer for top level input file */
2593 #define basebuf bb_common_bufsiz1
2595 /* Syntax classes */
2596 #define CWORD 0 /* character is nothing special */
2597 #define CNL 1 /* newline character */
2598 #define CBACK 2 /* a backslash character */
2599 #define CSQUOTE 3 /* single quote */
2600 #define CDQUOTE 4 /* double quote */
2601 #define CENDQUOTE 5 /* a terminating quote */
2602 #define CBQUOTE 6 /* backwards single quote */
2603 #define CVAR 7 /* a dollar sign */
2604 #define CENDVAR 8 /* a '}' character */
2605 #define CLP 9 /* a left paren in arithmetic */
2606 #define CRP 10 /* a right paren in arithmetic */
2607 #define CENDFILE 11 /* end of file */
2608 #define CCTL 12 /* like CWORD, except it must be escaped */
2609 #define CSPCL 13 /* these terminate a word */
2610 #define CIGN 14 /* character should be ignored */
2612 #if ENABLE_ASH_ALIAS
2616 #define PEOA_OR_PEOF PEOA
2620 #define PEOA_OR_PEOF PEOF
2623 /* number syntax index */
2624 #define BASESYNTAX 0 /* not in quotes */
2625 #define DQSYNTAX 1 /* in double quotes */
2626 #define SQSYNTAX 2 /* in single quotes */
2627 #define ARISYNTAX 3 /* in arithmetic */
2628 #define PSSYNTAX 4 /* prompt */
2630 #if ENABLE_ASH_OPTIMIZE_FOR_SIZE
2631 #define USE_SIT_FUNCTION
2634 #if ENABLE_SH_MATH_SUPPORT
2635 static const char S_I_T[][4] = {
2636 #if ENABLE_ASH_ALIAS
2637 { CSPCL, CIGN, CIGN, CIGN }, /* 0, PEOA */
2639 { CSPCL, CWORD, CWORD, CWORD }, /* 1, ' ' */
2640 { CNL, CNL, CNL, CNL }, /* 2, \n */
2641 { CWORD, CCTL, CCTL, CWORD }, /* 3, !*-/:=?[]~ */
2642 { CDQUOTE, CENDQUOTE, CWORD, CWORD }, /* 4, '"' */
2643 { CVAR, CVAR, CWORD, CVAR }, /* 5, $ */
2644 { CSQUOTE, CWORD, CENDQUOTE, CWORD }, /* 6, "'" */
2645 { CSPCL, CWORD, CWORD, CLP }, /* 7, ( */
2646 { CSPCL, CWORD, CWORD, CRP }, /* 8, ) */
2647 { CBACK, CBACK, CCTL, CBACK }, /* 9, \ */
2648 { CBQUOTE, CBQUOTE, CWORD, CBQUOTE }, /* 10, ` */
2649 { CENDVAR, CENDVAR, CWORD, CENDVAR }, /* 11, } */
2650 #ifndef USE_SIT_FUNCTION
2651 { CENDFILE, CENDFILE, CENDFILE, CENDFILE }, /* 12, PEOF */
2652 { CWORD, CWORD, CWORD, CWORD }, /* 13, 0-9A-Za-z */
2653 { CCTL, CCTL, CCTL, CCTL } /* 14, CTLESC ... */
2657 static const char S_I_T[][3] = {
2658 #if ENABLE_ASH_ALIAS
2659 { CSPCL, CIGN, CIGN }, /* 0, PEOA */
2661 { CSPCL, CWORD, CWORD }, /* 1, ' ' */
2662 { CNL, CNL, CNL }, /* 2, \n */
2663 { CWORD, CCTL, CCTL }, /* 3, !*-/:=?[]~ */
2664 { CDQUOTE, CENDQUOTE, CWORD }, /* 4, '"' */
2665 { CVAR, CVAR, CWORD }, /* 5, $ */
2666 { CSQUOTE, CWORD, CENDQUOTE }, /* 6, "'" */
2667 { CSPCL, CWORD, CWORD }, /* 7, ( */
2668 { CSPCL, CWORD, CWORD }, /* 8, ) */
2669 { CBACK, CBACK, CCTL }, /* 9, \ */
2670 { CBQUOTE, CBQUOTE, CWORD }, /* 10, ` */
2671 { CENDVAR, CENDVAR, CWORD }, /* 11, } */
2672 #ifndef USE_SIT_FUNCTION
2673 { CENDFILE, CENDFILE, CENDFILE }, /* 12, PEOF */
2674 { CWORD, CWORD, CWORD }, /* 13, 0-9A-Za-z */
2675 { CCTL, CCTL, CCTL } /* 14, CTLESC ... */
2678 #endif /* SH_MATH_SUPPORT */
2680 #ifdef USE_SIT_FUNCTION
2683 SIT(int c, int syntax)
2685 static const char spec_symbls[] ALIGN1 = "\t\n !\"$&'()*-/:;<=>?[\\]`|}~";
2686 #if ENABLE_ASH_ALIAS
2687 static const char syntax_index_table[] ALIGN1 = {
2688 1, 2, 1, 3, 4, 5, 1, 6, /* "\t\n !\"$&'" */
2689 7, 8, 3, 3, 3, 3, 1, 1, /* "()*-/:;<" */
2690 3, 1, 3, 3, 9, 3, 10, 1, /* "=>?[\\]`|" */
2694 static const char syntax_index_table[] ALIGN1 = {
2695 0, 1, 0, 2, 3, 4, 0, 5, /* "\t\n !\"$&'" */
2696 6, 7, 2, 2, 2, 2, 0, 0, /* "()*-/:;<" */
2697 2, 0, 2, 2, 8, 2, 9, 0, /* "=>?[\\]`|" */
2704 if (c == PEOF) { /* 2^8+2 */
2707 #if ENABLE_ASH_ALIAS
2708 if (c == PEOA) { /* 2^8+1 */
2713 if ((unsigned char)c >= (unsigned char)(CTLESC)
2714 && (unsigned char)c <= (unsigned char)(CTLQUOTEMARK)
2718 s = strchrnul(spec_symbls, c);
2722 indx = syntax_index_table[s - spec_symbls];
2724 return S_I_T[indx][syntax];
2727 #else /* !USE_SIT_FUNCTION */
2729 #if ENABLE_ASH_ALIAS
2730 #define CSPCL_CIGN_CIGN_CIGN 0
2731 #define CSPCL_CWORD_CWORD_CWORD 1
2732 #define CNL_CNL_CNL_CNL 2
2733 #define CWORD_CCTL_CCTL_CWORD 3
2734 #define CDQUOTE_CENDQUOTE_CWORD_CWORD 4
2735 #define CVAR_CVAR_CWORD_CVAR 5
2736 #define CSQUOTE_CWORD_CENDQUOTE_CWORD 6
2737 #define CSPCL_CWORD_CWORD_CLP 7
2738 #define CSPCL_CWORD_CWORD_CRP 8
2739 #define CBACK_CBACK_CCTL_CBACK 9
2740 #define CBQUOTE_CBQUOTE_CWORD_CBQUOTE 10
2741 #define CENDVAR_CENDVAR_CWORD_CENDVAR 11
2742 #define CENDFILE_CENDFILE_CENDFILE_CENDFILE 12
2743 #define CWORD_CWORD_CWORD_CWORD 13
2744 #define CCTL_CCTL_CCTL_CCTL 14
2746 #define CSPCL_CWORD_CWORD_CWORD 0
2747 #define CNL_CNL_CNL_CNL 1
2748 #define CWORD_CCTL_CCTL_CWORD 2
2749 #define CDQUOTE_CENDQUOTE_CWORD_CWORD 3
2750 #define CVAR_CVAR_CWORD_CVAR 4
2751 #define CSQUOTE_CWORD_CENDQUOTE_CWORD 5
2752 #define CSPCL_CWORD_CWORD_CLP 6
2753 #define CSPCL_CWORD_CWORD_CRP 7
2754 #define CBACK_CBACK_CCTL_CBACK 8
2755 #define CBQUOTE_CBQUOTE_CWORD_CBQUOTE 9
2756 #define CENDVAR_CENDVAR_CWORD_CENDVAR 10
2757 #define CENDFILE_CENDFILE_CENDFILE_CENDFILE 11
2758 #define CWORD_CWORD_CWORD_CWORD 12
2759 #define CCTL_CCTL_CCTL_CCTL 13
2762 static const char syntax_index_table[258] = {
2763 /* BASESYNTAX_DQSYNTAX_SQSYNTAX_ARISYNTAX */
2764 /* 0 PEOF */ CENDFILE_CENDFILE_CENDFILE_CENDFILE,
2765 #if ENABLE_ASH_ALIAS
2766 /* 1 PEOA */ CSPCL_CIGN_CIGN_CIGN,
2768 /* 2 -128 0x80 */ CWORD_CWORD_CWORD_CWORD,
2769 /* 3 -127 CTLESC */ CCTL_CCTL_CCTL_CCTL,
2770 /* 4 -126 CTLVAR */ CCTL_CCTL_CCTL_CCTL,
2771 /* 5 -125 CTLENDVAR */ CCTL_CCTL_CCTL_CCTL,
2772 /* 6 -124 CTLBACKQ */ CCTL_CCTL_CCTL_CCTL,
2773 /* 7 -123 CTLQUOTE */ CCTL_CCTL_CCTL_CCTL,
2774 /* 8 -122 CTLARI */ CCTL_CCTL_CCTL_CCTL,
2775 /* 9 -121 CTLENDARI */ CCTL_CCTL_CCTL_CCTL,
2776 /* 10 -120 CTLQUOTEMARK */ CCTL_CCTL_CCTL_CCTL,
2777 /* 11 -119 */ CWORD_CWORD_CWORD_CWORD,
2778 /* 12 -118 */ CWORD_CWORD_CWORD_CWORD,
2779 /* 13 -117 */ CWORD_CWORD_CWORD_CWORD,
2780 /* 14 -116 */ CWORD_CWORD_CWORD_CWORD,
2781 /* 15 -115 */ CWORD_CWORD_CWORD_CWORD,
2782 /* 16 -114 */ CWORD_CWORD_CWORD_CWORD,
2783 /* 17 -113 */ CWORD_CWORD_CWORD_CWORD,
2784 /* 18 -112 */ CWORD_CWORD_CWORD_CWORD,
2785 /* 19 -111 */ CWORD_CWORD_CWORD_CWORD,
2786 /* 20 -110 */ CWORD_CWORD_CWORD_CWORD,
2787 /* 21 -109 */ CWORD_CWORD_CWORD_CWORD,
2788 /* 22 -108 */ CWORD_CWORD_CWORD_CWORD,
2789 /* 23 -107 */ CWORD_CWORD_CWORD_CWORD,
2790 /* 24 -106 */ CWORD_CWORD_CWORD_CWORD,
2791 /* 25 -105 */ CWORD_CWORD_CWORD_CWORD,
2792 /* 26 -104 */ CWORD_CWORD_CWORD_CWORD,
2793 /* 27 -103 */ CWORD_CWORD_CWORD_CWORD,
2794 /* 28 -102 */ CWORD_CWORD_CWORD_CWORD,
2795 /* 29 -101 */ CWORD_CWORD_CWORD_CWORD,
2796 /* 30 -100 */ CWORD_CWORD_CWORD_CWORD,
2797 /* 31 -99 */ CWORD_CWORD_CWORD_CWORD,
2798 /* 32 -98 */ CWORD_CWORD_CWORD_CWORD,
2799 /* 33 -97 */ CWORD_CWORD_CWORD_CWORD,
2800 /* 34 -96 */ CWORD_CWORD_CWORD_CWORD,
2801 /* 35 -95 */ CWORD_CWORD_CWORD_CWORD,
2802 /* 36 -94 */ CWORD_CWORD_CWORD_CWORD,
2803 /* 37 -93 */ CWORD_CWORD_CWORD_CWORD,
2804 /* 38 -92 */ CWORD_CWORD_CWORD_CWORD,
2805 /* 39 -91 */ CWORD_CWORD_CWORD_CWORD,
2806 /* 40 -90 */ CWORD_CWORD_CWORD_CWORD,
2807 /* 41 -89 */ CWORD_CWORD_CWORD_CWORD,
2808 /* 42 -88 */ CWORD_CWORD_CWORD_CWORD,
2809 /* 43 -87 */ CWORD_CWORD_CWORD_CWORD,
2810 /* 44 -86 */ CWORD_CWORD_CWORD_CWORD,
2811 /* 45 -85 */ CWORD_CWORD_CWORD_CWORD,
2812 /* 46 -84 */ CWORD_CWORD_CWORD_CWORD,
2813 /* 47 -83 */ CWORD_CWORD_CWORD_CWORD,
2814 /* 48 -82 */ CWORD_CWORD_CWORD_CWORD,
2815 /* 49 -81 */ CWORD_CWORD_CWORD_CWORD,
2816 /* 50 -80 */ CWORD_CWORD_CWORD_CWORD,
2817 /* 51 -79 */ CWORD_CWORD_CWORD_CWORD,
2818 /* 52 -78 */ CWORD_CWORD_CWORD_CWORD,
2819 /* 53 -77 */ CWORD_CWORD_CWORD_CWORD,
2820 /* 54 -76 */ CWORD_CWORD_CWORD_CWORD,
2821 /* 55 -75 */ CWORD_CWORD_CWORD_CWORD,
2822 /* 56 -74 */ CWORD_CWORD_CWORD_CWORD,
2823 /* 57 -73 */ CWORD_CWORD_CWORD_CWORD,
2824 /* 58 -72 */ CWORD_CWORD_CWORD_CWORD,
2825 /* 59 -71 */ CWORD_CWORD_CWORD_CWORD,
2826 /* 60 -70 */ CWORD_CWORD_CWORD_CWORD,
2827 /* 61 -69 */ CWORD_CWORD_CWORD_CWORD,
2828 /* 62 -68 */ CWORD_CWORD_CWORD_CWORD,
2829 /* 63 -67 */ CWORD_CWORD_CWORD_CWORD,
2830 /* 64 -66 */ CWORD_CWORD_CWORD_CWORD,
2831 /* 65 -65 */ CWORD_CWORD_CWORD_CWORD,
2832 /* 66 -64 */ CWORD_CWORD_CWORD_CWORD,
2833 /* 67 -63 */ CWORD_CWORD_CWORD_CWORD,
2834 /* 68 -62 */ CWORD_CWORD_CWORD_CWORD,
2835 /* 69 -61 */ CWORD_CWORD_CWORD_CWORD,
2836 /* 70 -60 */ CWORD_CWORD_CWORD_CWORD,
2837 /* 71 -59 */ CWORD_CWORD_CWORD_CWORD,
2838 /* 72 -58 */ CWORD_CWORD_CWORD_CWORD,
2839 /* 73 -57 */ CWORD_CWORD_CWORD_CWORD,
2840 /* 74 -56 */ CWORD_CWORD_CWORD_CWORD,
2841 /* 75 -55 */ CWORD_CWORD_CWORD_CWORD,
2842 /* 76 -54 */ CWORD_CWORD_CWORD_CWORD,
2843 /* 77 -53 */ CWORD_CWORD_CWORD_CWORD,
2844 /* 78 -52 */ CWORD_CWORD_CWORD_CWORD,
2845 /* 79 -51 */ CWORD_CWORD_CWORD_CWORD,
2846 /* 80 -50 */ CWORD_CWORD_CWORD_CWORD,
2847 /* 81 -49 */ CWORD_CWORD_CWORD_CWORD,
2848 /* 82 -48 */ CWORD_CWORD_CWORD_CWORD,
2849 /* 83 -47 */ CWORD_CWORD_CWORD_CWORD,
2850 /* 84 -46 */ CWORD_CWORD_CWORD_CWORD,
2851 /* 85 -45 */ CWORD_CWORD_CWORD_CWORD,
2852 /* 86 -44 */ CWORD_CWORD_CWORD_CWORD,
2853 /* 87 -43 */ CWORD_CWORD_CWORD_CWORD,
2854 /* 88 -42 */ CWORD_CWORD_CWORD_CWORD,
2855 /* 89 -41 */ CWORD_CWORD_CWORD_CWORD,
2856 /* 90 -40 */ CWORD_CWORD_CWORD_CWORD,
2857 /* 91 -39 */ CWORD_CWORD_CWORD_CWORD,
2858 /* 92 -38 */ CWORD_CWORD_CWORD_CWORD,
2859 /* 93 -37 */ CWORD_CWORD_CWORD_CWORD,
2860 /* 94 -36 */ CWORD_CWORD_CWORD_CWORD,
2861 /* 95 -35 */ CWORD_CWORD_CWORD_CWORD,
2862 /* 96 -34 */ CWORD_CWORD_CWORD_CWORD,
2863 /* 97 -33 */ CWORD_CWORD_CWORD_CWORD,
2864 /* 98 -32 */ CWORD_CWORD_CWORD_CWORD,
2865 /* 99 -31 */ CWORD_CWORD_CWORD_CWORD,
2866 /* 100 -30 */ CWORD_CWORD_CWORD_CWORD,
2867 /* 101 -29 */ CWORD_CWORD_CWORD_CWORD,
2868 /* 102 -28 */ CWORD_CWORD_CWORD_CWORD,
2869 /* 103 -27 */ CWORD_CWORD_CWORD_CWORD,
2870 /* 104 -26 */ CWORD_CWORD_CWORD_CWORD,
2871 /* 105 -25 */ CWORD_CWORD_CWORD_CWORD,
2872 /* 106 -24 */ CWORD_CWORD_CWORD_CWORD,
2873 /* 107 -23 */ CWORD_CWORD_CWORD_CWORD,
2874 /* 108 -22 */ CWORD_CWORD_CWORD_CWORD,
2875 /* 109 -21 */ CWORD_CWORD_CWORD_CWORD,
2876 /* 110 -20 */ CWORD_CWORD_CWORD_CWORD,
2877 /* 111 -19 */ CWORD_CWORD_CWORD_CWORD,
2878 /* 112 -18 */ CWORD_CWORD_CWORD_CWORD,
2879 /* 113 -17 */ CWORD_CWORD_CWORD_CWORD,
2880 /* 114 -16 */ CWORD_CWORD_CWORD_CWORD,
2881 /* 115 -15 */ CWORD_CWORD_CWORD_CWORD,
2882 /* 116 -14 */ CWORD_CWORD_CWORD_CWORD,
2883 /* 117 -13 */ CWORD_CWORD_CWORD_CWORD,
2884 /* 118 -12 */ CWORD_CWORD_CWORD_CWORD,
2885 /* 119 -11 */ CWORD_CWORD_CWORD_CWORD,
2886 /* 120 -10 */ CWORD_CWORD_CWORD_CWORD,
2887 /* 121 -9 */ CWORD_CWORD_CWORD_CWORD,
2888 /* 122 -8 */ CWORD_CWORD_CWORD_CWORD,
2889 /* 123 -7 */ CWORD_CWORD_CWORD_CWORD,
2890 /* 124 -6 */ CWORD_CWORD_CWORD_CWORD,
2891 /* 125 -5 */ CWORD_CWORD_CWORD_CWORD,
2892 /* 126 -4 */ CWORD_CWORD_CWORD_CWORD,
2893 /* 127 -3 */ CWORD_CWORD_CWORD_CWORD,
2894 /* 128 -2 */ CWORD_CWORD_CWORD_CWORD,
2895 /* 129 -1 */ CWORD_CWORD_CWORD_CWORD,
2896 /* 130 0 */ CWORD_CWORD_CWORD_CWORD,
2897 /* 131 1 */ CWORD_CWORD_CWORD_CWORD,
2898 /* 132 2 */ CWORD_CWORD_CWORD_CWORD,
2899 /* 133 3 */ CWORD_CWORD_CWORD_CWORD,
2900 /* 134 4 */ CWORD_CWORD_CWORD_CWORD,
2901 /* 135 5 */ CWORD_CWORD_CWORD_CWORD,
2902 /* 136 6 */ CWORD_CWORD_CWORD_CWORD,
2903 /* 137 7 */ CWORD_CWORD_CWORD_CWORD,
2904 /* 138 8 */ CWORD_CWORD_CWORD_CWORD,
2905 /* 139 9 "\t" */ CSPCL_CWORD_CWORD_CWORD,
2906 /* 140 10 "\n" */ CNL_CNL_CNL_CNL,
2907 /* 141 11 */ CWORD_CWORD_CWORD_CWORD,
2908 /* 142 12 */ CWORD_CWORD_CWORD_CWORD,
2909 /* 143 13 */ CWORD_CWORD_CWORD_CWORD,
2910 /* 144 14 */ CWORD_CWORD_CWORD_CWORD,
2911 /* 145 15 */ CWORD_CWORD_CWORD_CWORD,
2912 /* 146 16 */ CWORD_CWORD_CWORD_CWORD,
2913 /* 147 17 */ CWORD_CWORD_CWORD_CWORD,
2914 /* 148 18 */ CWORD_CWORD_CWORD_CWORD,
2915 /* 149 19 */ CWORD_CWORD_CWORD_CWORD,
2916 /* 150 20 */ CWORD_CWORD_CWORD_CWORD,
2917 /* 151 21 */ CWORD_CWORD_CWORD_CWORD,
2918 /* 152 22 */ CWORD_CWORD_CWORD_CWORD,
2919 /* 153 23 */ CWORD_CWORD_CWORD_CWORD,
2920 /* 154 24 */ CWORD_CWORD_CWORD_CWORD,
2921 /* 155 25 */ CWORD_CWORD_CWORD_CWORD,
2922 /* 156 26 */ CWORD_CWORD_CWORD_CWORD,
2923 /* 157 27 */ CWORD_CWORD_CWORD_CWORD,
2924 /* 158 28 */ CWORD_CWORD_CWORD_CWORD,
2925 /* 159 29 */ CWORD_CWORD_CWORD_CWORD,
2926 /* 160 30 */ CWORD_CWORD_CWORD_CWORD,
2927 /* 161 31 */ CWORD_CWORD_CWORD_CWORD,
2928 /* 162 32 " " */ CSPCL_CWORD_CWORD_CWORD,
2929 /* 163 33 "!" */ CWORD_CCTL_CCTL_CWORD,
2930 /* 164 34 """ */ CDQUOTE_CENDQUOTE_CWORD_CWORD,
2931 /* 165 35 "#" */ CWORD_CWORD_CWORD_CWORD,
2932 /* 166 36 "$" */ CVAR_CVAR_CWORD_CVAR,
2933 /* 167 37 "%" */ CWORD_CWORD_CWORD_CWORD,
2934 /* 168 38 "&" */ CSPCL_CWORD_CWORD_CWORD,
2935 /* 169 39 "'" */ CSQUOTE_CWORD_CENDQUOTE_CWORD,
2936 /* 170 40 "(" */ CSPCL_CWORD_CWORD_CLP,
2937 /* 171 41 ")" */ CSPCL_CWORD_CWORD_CRP,
2938 /* 172 42 "*" */ CWORD_CCTL_CCTL_CWORD,
2939 /* 173 43 "+" */ CWORD_CWORD_CWORD_CWORD,
2940 /* 174 44 "," */ CWORD_CWORD_CWORD_CWORD,
2941 /* 175 45 "-" */ CWORD_CCTL_CCTL_CWORD,
2942 /* 176 46 "." */ CWORD_CWORD_CWORD_CWORD,
2943 /* 177 47 "/" */ CWORD_CCTL_CCTL_CWORD,
2944 /* 178 48 "0" */ CWORD_CWORD_CWORD_CWORD,
2945 /* 179 49 "1" */ CWORD_CWORD_CWORD_CWORD,
2946 /* 180 50 "2" */ CWORD_CWORD_CWORD_CWORD,
2947 /* 181 51 "3" */ CWORD_CWORD_CWORD_CWORD,
2948 /* 182 52 "4" */ CWORD_CWORD_CWORD_CWORD,
2949 /* 183 53 "5" */ CWORD_CWORD_CWORD_CWORD,
2950 /* 184 54 "6" */ CWORD_CWORD_CWORD_CWORD,
2951 /* 185 55 "7" */ CWORD_CWORD_CWORD_CWORD,
2952 /* 186 56 "8" */ CWORD_CWORD_CWORD_CWORD,
2953 /* 187 57 "9" */ CWORD_CWORD_CWORD_CWORD,
2954 /* 188 58 ":" */ CWORD_CCTL_CCTL_CWORD,
2955 /* 189 59 ";" */ CSPCL_CWORD_CWORD_CWORD,
2956 /* 190 60 "<" */ CSPCL_CWORD_CWORD_CWORD,
2957 /* 191 61 "=" */ CWORD_CCTL_CCTL_CWORD,
2958 /* 192 62 ">" */ CSPCL_CWORD_CWORD_CWORD,
2959 /* 193 63 "?" */ CWORD_CCTL_CCTL_CWORD,
2960 /* 194 64 "@" */ CWORD_CWORD_CWORD_CWORD,
2961 /* 195 65 "A" */ CWORD_CWORD_CWORD_CWORD,
2962 /* 196 66 "B" */ CWORD_CWORD_CWORD_CWORD,
2963 /* 197 67 "C" */ CWORD_CWORD_CWORD_CWORD,
2964 /* 198 68 "D" */ CWORD_CWORD_CWORD_CWORD,
2965 /* 199 69 "E" */ CWORD_CWORD_CWORD_CWORD,
2966 /* 200 70 "F" */ CWORD_CWORD_CWORD_CWORD,
2967 /* 201 71 "G" */ CWORD_CWORD_CWORD_CWORD,
2968 /* 202 72 "H" */ CWORD_CWORD_CWORD_CWORD,
2969 /* 203 73 "I" */ CWORD_CWORD_CWORD_CWORD,
2970 /* 204 74 "J" */ CWORD_CWORD_CWORD_CWORD,
2971 /* 205 75 "K" */ CWORD_CWORD_CWORD_CWORD,
2972 /* 206 76 "L" */ CWORD_CWORD_CWORD_CWORD,
2973 /* 207 77 "M" */ CWORD_CWORD_CWORD_CWORD,
2974 /* 208 78 "N" */ CWORD_CWORD_CWORD_CWORD,
2975 /* 209 79 "O" */ CWORD_CWORD_CWORD_CWORD,
2976 /* 210 80 "P" */ CWORD_CWORD_CWORD_CWORD,
2977 /* 211 81 "Q" */ CWORD_CWORD_CWORD_CWORD,
2978 /* 212 82 "R" */ CWORD_CWORD_CWORD_CWORD,
2979 /* 213 83 "S" */ CWORD_CWORD_CWORD_CWORD,
2980 /* 214 84 "T" */ CWORD_CWORD_CWORD_CWORD,
2981 /* 215 85 "U" */ CWORD_CWORD_CWORD_CWORD,
2982 /* 216 86 "V" */ CWORD_CWORD_CWORD_CWORD,
2983 /* 217 87 "W" */ CWORD_CWORD_CWORD_CWORD,
2984 /* 218 88 "X" */ CWORD_CWORD_CWORD_CWORD,
2985 /* 219 89 "Y" */ CWORD_CWORD_CWORD_CWORD,
2986 /* 220 90 "Z" */ CWORD_CWORD_CWORD_CWORD,
2987 /* 221 91 "[" */ CWORD_CCTL_CCTL_CWORD,
2988 /* 222 92 "\" */ CBACK_CBACK_CCTL_CBACK,
2989 /* 223 93 "]" */ CWORD_CCTL_CCTL_CWORD,
2990 /* 224 94 "^" */ CWORD_CWORD_CWORD_CWORD,
2991 /* 225 95 "_" */ CWORD_CWORD_CWORD_CWORD,
2992 /* 226 96 "`" */ CBQUOTE_CBQUOTE_CWORD_CBQUOTE,
2993 /* 227 97 "a" */ CWORD_CWORD_CWORD_CWORD,
2994 /* 228 98 "b" */ CWORD_CWORD_CWORD_CWORD,
2995 /* 229 99 "c" */ CWORD_CWORD_CWORD_CWORD,
2996 /* 230 100 "d" */ CWORD_CWORD_CWORD_CWORD,
2997 /* 231 101 "e" */ CWORD_CWORD_CWORD_CWORD,
2998 /* 232 102 "f" */ CWORD_CWORD_CWORD_CWORD,
2999 /* 233 103 "g" */ CWORD_CWORD_CWORD_CWORD,
3000 /* 234 104 "h" */ CWORD_CWORD_CWORD_CWORD,
3001 /* 235 105 "i" */ CWORD_CWORD_CWORD_CWORD,
3002 /* 236 106 "j" */ CWORD_CWORD_CWORD_CWORD,
3003 /* 237 107 "k" */ CWORD_CWORD_CWORD_CWORD,
3004 /* 238 108 "l" */ CWORD_CWORD_CWORD_CWORD,
3005 /* 239 109 "m" */ CWORD_CWORD_CWORD_CWORD,
3006 /* 240 110 "n" */ CWORD_CWORD_CWORD_CWORD,
3007 /* 241 111 "o" */ CWORD_CWORD_CWORD_CWORD,
3008 /* 242 112 "p" */ CWORD_CWORD_CWORD_CWORD,
3009 /* 243 113 "q" */ CWORD_CWORD_CWORD_CWORD,
3010 /* 244 114 "r" */ CWORD_CWORD_CWORD_CWORD,
3011 /* 245 115 "s" */ CWORD_CWORD_CWORD_CWORD,
3012 /* 246 116 "t" */ CWORD_CWORD_CWORD_CWORD,
3013 /* 247 117 "u" */ CWORD_CWORD_CWORD_CWORD,
3014 /* 248 118 "v" */ CWORD_CWORD_CWORD_CWORD,
3015 /* 249 119 "w" */ CWORD_CWORD_CWORD_CWORD,
3016 /* 250 120 "x" */ CWORD_CWORD_CWORD_CWORD,
3017 /* 251 121 "y" */ CWORD_CWORD_CWORD_CWORD,
3018 /* 252 122 "z" */ CWORD_CWORD_CWORD_CWORD,
3019 /* 253 123 "{" */ CWORD_CWORD_CWORD_CWORD,
3020 /* 254 124 "|" */ CSPCL_CWORD_CWORD_CWORD,
3021 /* 255 125 "}" */ CENDVAR_CENDVAR_CWORD_CENDVAR,
3022 /* 256 126 "~" */ CWORD_CCTL_CCTL_CWORD,
3023 /* 257 127 */ CWORD_CWORD_CWORD_CWORD,
3026 #define SIT(c, syntax) (S_I_T[(int)syntax_index_table[(int)(c) + SYNBASE]][syntax])
3028 #endif /* USE_SIT_FUNCTION */
3031 /* ============ Alias handling */
3033 #if ENABLE_ASH_ALIAS
3035 #define ALIASINUSE 1
3046 static struct alias **atab; // [ATABSIZE];
3047 #define INIT_G_alias() do { \
3048 atab = xzalloc(ATABSIZE * sizeof(atab[0])); \
3052 static struct alias **
3053 __lookupalias(const char *name) {
3054 unsigned int hashval;
3061 ch = (unsigned char)*p;
3065 ch = (unsigned char)*++p;
3067 app = &atab[hashval % ATABSIZE];
3069 for (; *app; app = &(*app)->next) {
3070 if (strcmp(name, (*app)->name) == 0) {
3078 static struct alias *
3079 lookupalias(const char *name, int check)
3081 struct alias *ap = *__lookupalias(name);
3083 if (check && ap && (ap->flag & ALIASINUSE))
3088 static struct alias *
3089 freealias(struct alias *ap)
3093 if (ap->flag & ALIASINUSE) {
3094 ap->flag |= ALIASDEAD;
3106 setalias(const char *name, const char *val)
3108 struct alias *ap, **app;
3110 app = __lookupalias(name);
3114 if (!(ap->flag & ALIASINUSE)) {
3117 ap->val = ckstrdup(val);
3118 ap->flag &= ~ALIASDEAD;
3121 ap = ckzalloc(sizeof(struct alias));
3122 ap->name = ckstrdup(name);
3123 ap->val = ckstrdup(val);
3124 /*ap->flag = 0; - ckzalloc did it */
3125 /*ap->next = NULL;*/
3132 unalias(const char *name)
3136 app = __lookupalias(name);
3140 *app = freealias(*app);
3151 struct alias *ap, **app;
3155 for (i = 0; i < ATABSIZE; i++) {
3157 for (ap = *app; ap; ap = *app) {
3158 *app = freealias(*app);
3168 printalias(const struct alias *ap)
3170 out1fmt("%s=%s\n", ap->name, single_quote(ap->val));
3174 * TODO - sort output
3176 static int FAST_FUNC
3177 aliascmd(int argc UNUSED_PARAM, char **argv)
3186 for (i = 0; i < ATABSIZE; i++) {
3187 for (ap = atab[i]; ap; ap = ap->next) {
3193 while ((n = *++argv) != NULL) {
3194 v = strchr(n+1, '=');
3195 if (v == NULL) { /* n+1: funny ksh stuff */
3196 ap = *__lookupalias(n);
3198 fprintf(stderr, "%s: %s not found\n", "alias", n);
3211 static int FAST_FUNC
3212 unaliascmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
3216 while ((i = nextopt("a")) != '\0') {
3222 for (i = 0; *argptr; argptr++) {
3223 if (unalias(*argptr)) {
3224 fprintf(stderr, "%s: %s not found\n", "unalias", *argptr);
3232 #endif /* ASH_ALIAS */
3235 /* ============ jobs.c */
3237 /* Mode argument to forkshell. Don't change FORK_FG or FORK_BG. */
3240 #define FORK_NOJOB 2
3242 /* mode flags for showjob(s) */
3243 #define SHOW_PGID 0x01 /* only show pgid - for jobs -p */
3244 #define SHOW_PID 0x04 /* include process pid */
3245 #define SHOW_CHANGED 0x08 /* only jobs whose state has changed */
3248 * A job structure contains information about a job. A job is either a
3249 * single process or a set of processes contained in a pipeline. In the
3250 * latter case, pidlist will be non-NULL, and will point to a -1 terminated
3255 pid_t pid; /* process id */
3256 int status; /* last process status from wait() */
3257 char *cmd; /* text of command being run */
3261 struct procstat ps0; /* status of process */
3262 struct procstat *ps; /* status or processes when more than one */
3264 int stopstatus; /* status of a stopped job */
3267 nprocs: 16, /* number of processes */
3269 #define JOBRUNNING 0 /* at least one proc running */
3270 #define JOBSTOPPED 1 /* all procs are stopped */
3271 #define JOBDONE 2 /* all procs are completed */
3273 sigint: 1, /* job was killed by SIGINT */
3274 jobctl: 1, /* job running under job control */
3276 waited: 1, /* true if this entry has been waited for */
3277 used: 1, /* true if this entry is in used */
3278 changed: 1; /* true if status has changed */
3279 struct job *prev_job; /* previous job */
3282 static struct job *makejob(/*union node *,*/ int);
3284 #define forkshell(job, node, mode) forkshell(job, mode)
3286 static int forkshell(struct job *, union node *, int);
3287 static int waitforjob(struct job *);
3290 enum { doing_jobctl = 0 };
3291 #define setjobctl(on) do {} while (0)
3293 static smallint doing_jobctl; //references:8
3294 static void setjobctl(int);
3301 ignoresig(int signo)
3303 /* Avoid unnecessary system calls. Is it already SIG_IGNed? */
3304 if (sigmode[signo - 1] != S_IGN && sigmode[signo - 1] != S_HARD_IGN) {
3305 /* No, need to do it */
3306 signal(signo, SIG_IGN);
3308 sigmode[signo - 1] = S_HARD_IGN;
3312 * Signal handler. Only one usage site - in setsignal()
3317 gotsig[signo - 1] = 1;
3319 if (/* exsig || */ (signo == SIGINT && !trap[SIGINT])) {
3322 raise_interrupt(); /* does not return */
3331 * Set the signal handler for the specified signal. The routine figures
3332 * out what it should be set to.
3335 setsignal(int signo)
3338 char cur_act, new_act;
3339 struct sigaction act;
3343 if (t != NULL) { /* trap for this sig is set */
3345 if (t[0] == '\0') /* trap is "": ignore this sig */
3349 if (rootshell && new_act == S_DFL) {
3352 if (iflag || minusc || sflag == 0)
3361 * "In all cases, bash ignores SIGQUIT. Non-builtin
3362 * commands run by bash have signal handlers
3363 * set to the values inherited by the shell
3364 * from its parent". */
3380 //TODO: if !rootshell, we reset SIGQUIT to DFL,
3381 //whereas we have to restore it to what shell got on entry
3382 //from the parent. See comment above
3384 t = &sigmode[signo - 1];
3387 /* current setting is not yet known */
3388 if (sigaction(signo, NULL, &act)) {
3389 /* pretend it worked; maybe we should give a warning,
3390 * but other shells don't. We don't alter sigmode,
3391 * so we retry every time.
3392 * btw, in Linux it never fails. --vda */
3395 if (act.sa_handler == SIG_IGN) {
3396 cur_act = S_HARD_IGN;
3398 && (signo == SIGTSTP || signo == SIGTTIN || signo == SIGTTOU)
3400 cur_act = S_IGN; /* don't hard ignore these */
3404 if (cur_act == S_HARD_IGN || cur_act == new_act)
3407 act.sa_handler = SIG_DFL;
3410 act.sa_handler = onsig;
3411 act.sa_flags = 0; /* matters only if !DFL and !IGN */
3412 sigfillset(&act.sa_mask); /* ditto */
3415 act.sa_handler = SIG_IGN;
3418 sigaction_set(signo, &act);
3423 /* mode flags for set_curjob */
3424 #define CUR_DELETE 2
3425 #define CUR_RUNNING 1
3426 #define CUR_STOPPED 0
3428 /* mode flags for dowait */
3429 #define DOWAIT_NONBLOCK WNOHANG
3430 #define DOWAIT_BLOCK 0
3433 /* pgrp of shell on invocation */
3434 static int initialpgrp; //references:2
3435 static int ttyfd = -1; //5
3438 static struct job *jobtab; //5
3440 static unsigned njobs; //4
3442 static struct job *curjob; //lots
3443 /* number of presumed living untracked jobs */
3444 static int jobless; //4
3447 set_curjob(struct job *jp, unsigned mode)
3450 struct job **jpp, **curp;
3452 /* first remove from list */
3453 jpp = curp = &curjob;
3458 jpp = &jp1->prev_job;
3460 *jpp = jp1->prev_job;
3462 /* Then re-insert in correct position */
3470 /* job being deleted */
3473 /* newly created job or backgrounded job,
3474 put after all stopped jobs. */
3478 if (!jp1 || jp1->state != JOBSTOPPED)
3481 jpp = &jp1->prev_job;
3487 /* newly stopped job - becomes curjob */
3488 jp->prev_job = *jpp;
3496 jobno(const struct job *jp)
3498 return jp - jobtab + 1;
3503 * Convert a job name to a job structure.
3506 #define getjob(name, getctl) getjob(name)
3509 getjob(const char *name, int getctl)
3513 const char *err_msg = "No such job: %s";
3517 char *(*match)(const char *, const char *);
3532 if (c == '+' || c == '%') {
3534 err_msg = "No current job";
3540 err_msg = "No previous job";
3549 // TODO: number() instead? It does error checking...
3552 jp = jobtab + num - 1;
3569 if (match(jp->ps[0].cmd, p)) {
3573 err_msg = "%s: ambiguous";
3580 err_msg = "job %s not created under job control";
3581 if (getctl && jp->jobctl == 0)
3586 ash_msg_and_raise_error(err_msg, name);
3590 * Mark a job structure as unused.
3593 freejob(struct job *jp)
3595 struct procstat *ps;
3599 for (i = jp->nprocs, ps = jp->ps; --i >= 0; ps++) {
3600 if (ps->cmd != nullstr)
3603 if (jp->ps != &jp->ps0)
3606 set_curjob(jp, CUR_DELETE);
3612 xtcsetpgrp(int fd, pid_t pgrp)
3614 if (tcsetpgrp(fd, pgrp))
3615 ash_msg_and_raise_error("can't set tty process group (%m)");
3619 * Turn job control on and off.
3621 * Note: This code assumes that the third arg to ioctl is a character
3622 * pointer, which is true on Berkeley systems but not System V. Since
3623 * System V doesn't have job control yet, this isn't a problem now.
3625 * Called with interrupts off.
3633 if (on == doing_jobctl || rootshell == 0)
3637 ofd = fd = open(_PATH_TTY, O_RDWR);
3639 /* BTW, bash will try to open(ttyname(0)) if open("/dev/tty") fails.
3640 * That sometimes helps to acquire controlling tty.
3641 * Obviously, a workaround for bugs when someone
3642 * failed to provide a controlling tty to bash! :) */
3648 fd = fcntl(fd, F_DUPFD, 10);
3653 /* fd is a tty at this point */
3654 close_on_exec_on(fd);
3655 do { /* while we are in the background */
3656 pgrp = tcgetpgrp(fd);
3659 ash_msg("can't access tty; job control turned off");
3663 if (pgrp == getpgrp())
3674 xtcsetpgrp(fd, pgrp);
3676 /* turning job control off */
3679 /* was xtcsetpgrp, but this can make exiting ash
3680 * loop forever if pty is already deleted */
3681 tcsetpgrp(fd, pgrp);
3695 static int FAST_FUNC
3696 killcmd(int argc, char **argv)
3699 if (argv[1] && strcmp(argv[1], "-l") != 0) {
3701 if (argv[i][0] == '%') {
3702 struct job *jp = getjob(argv[i], 0);
3703 unsigned pid = jp->ps[0].pid;
3704 /* Enough space for ' -NNN<nul>' */
3705 argv[i] = alloca(sizeof(int)*3 + 3);
3706 /* kill_main has matching code to expect
3707 * leading space. Needed to not confuse
3708 * negative pids with "kill -SIGNAL_NO" syntax */
3709 sprintf(argv[i], " -%u", pid);
3711 } while (argv[++i]);
3713 return kill_main(argc, argv);
3717 showpipe(struct job *jp, FILE *out)
3719 struct procstat *sp;
3720 struct procstat *spend;
3722 spend = jp->ps + jp->nprocs;
3723 for (sp = jp->ps + 1; sp < spend; sp++)
3724 fprintf(out, " | %s", sp->cmd);
3725 outcslow('\n', out);
3726 flush_stdout_stderr();
3731 restartjob(struct job *jp, int mode)
3733 struct procstat *ps;
3739 if (jp->state == JOBDONE)
3741 jp->state = JOBRUNNING;
3743 if (mode == FORK_FG)
3744 xtcsetpgrp(ttyfd, pgid);
3745 killpg(pgid, SIGCONT);
3749 if (WIFSTOPPED(ps->status)) {
3755 status = (mode == FORK_FG) ? waitforjob(jp) : 0;
3760 static int FAST_FUNC
3761 fg_bgcmd(int argc UNUSED_PARAM, char **argv)
3768 mode = (**argv == 'f') ? FORK_FG : FORK_BG;
3773 jp = getjob(*argv, 1);
3774 if (mode == FORK_BG) {
3775 set_curjob(jp, CUR_RUNNING);
3776 fprintf(out, "[%d] ", jobno(jp));
3778 outstr(jp->ps->cmd, out);
3780 retval = restartjob(jp, mode);
3781 } while (*argv && *++argv);
3787 sprint_status(char *s, int status, int sigonly)
3793 if (!WIFEXITED(status)) {
3795 if (WIFSTOPPED(status))
3796 st = WSTOPSIG(status);
3799 st = WTERMSIG(status);
3801 if (st == SIGINT || st == SIGPIPE)
3804 if (WIFSTOPPED(status))
3809 col = fmtstr(s, 32, strsignal(st));
3810 if (WCOREDUMP(status)) {
3811 col += fmtstr(s + col, 16, " (core dumped)");
3813 } else if (!sigonly) {
3814 st = WEXITSTATUS(status);
3816 col = fmtstr(s, 16, "Done(%d)", st);
3818 col = fmtstr(s, 16, "Done");
3825 dowait(int wait_flags, struct job *job)
3830 struct job *thisjob;
3833 TRACE(("dowait(0x%x) called\n", wait_flags));
3835 /* Do a wait system call. If job control is compiled in, we accept
3836 * stopped processes. wait_flags may have WNOHANG, preventing blocking.
3837 * NB: _not_ safe_waitpid, we need to detect EINTR */
3838 pid = waitpid(-1, &status,
3839 (doing_jobctl ? (wait_flags | WUNTRACED) : wait_flags));
3840 TRACE(("wait returns pid=%d, status=0x%x, errno=%d(%s)\n",
3841 pid, status, errno, strerror(errno)));
3847 for (jp = curjob; jp; jp = jp->prev_job) {
3848 struct procstat *sp;
3849 struct procstat *spend;
3850 if (jp->state == JOBDONE)
3853 spend = jp->ps + jp->nprocs;
3856 if (sp->pid == pid) {
3857 TRACE(("Job %d: changing status of proc %d "
3858 "from 0x%x to 0x%x\n",
3859 jobno(jp), pid, sp->status, status));
3860 sp->status = status;
3863 if (sp->status == -1)
3866 if (state == JOBRUNNING)
3868 if (WIFSTOPPED(sp->status)) {
3869 jp->stopstatus = sp->status;
3873 } while (++sp < spend);
3878 if (!WIFSTOPPED(status))
3884 if (state != JOBRUNNING) {
3885 thisjob->changed = 1;
3887 if (thisjob->state != state) {
3888 TRACE(("Job %d: changing state from %d to %d\n",
3889 jobno(thisjob), thisjob->state, state));
3890 thisjob->state = state;
3892 if (state == JOBSTOPPED) {
3893 set_curjob(thisjob, CUR_STOPPED);
3902 if (thisjob && thisjob == job) {
3906 len = sprint_status(s, status, 1);
3917 blocking_wait_with_raise_on_sig(struct job *job)
3919 pid_t pid = dowait(DOWAIT_BLOCK, job);
3920 if (pid <= 0 && pendingsig)
3921 raise_exception(EXSIG);
3927 showjob(FILE *out, struct job *jp, int mode)
3929 struct procstat *ps;
3930 struct procstat *psend;
3937 if (mode & SHOW_PGID) {
3938 /* just output process (group) id of pipeline */
3939 fprintf(out, "%d\n", ps->pid);
3943 col = fmtstr(s, 16, "[%d] ", jobno(jp));
3948 else if (curjob && jp == curjob->prev_job)
3951 if (mode & SHOW_PID)
3952 col += fmtstr(s + col, 16, "%d ", ps->pid);
3954 psend = ps + jp->nprocs;
3956 if (jp->state == JOBRUNNING) {
3957 strcpy(s + col, "Running");
3958 col += sizeof("Running") - 1;
3960 int status = psend[-1].status;
3961 if (jp->state == JOBSTOPPED)
3962 status = jp->stopstatus;
3963 col += sprint_status(s + col, status, 0);
3969 /* for each process */
3970 col = fmtstr(s, 48, " |\n%*c%d ", indent_col, ' ', ps->pid) - 3;
3972 fprintf(out, "%s%*c%s",
3973 s, 33 - col >= 0 ? 33 - col : 0, ' ', ps->cmd
3975 if (!(mode & SHOW_PID)) {
3979 if (++ps == psend) {
3980 outcslow('\n', out);
3987 if (jp->state == JOBDONE) {
3988 TRACE(("showjob: freeing job %d\n", jobno(jp)));
3994 * Print a list of jobs. If "change" is nonzero, only print jobs whose
3995 * statuses have changed since the last call to showjobs.
3998 showjobs(FILE *out, int mode)
4002 TRACE(("showjobs(0x%x) called\n", mode));
4004 /* Handle all finished jobs */
4005 while (dowait(DOWAIT_NONBLOCK, NULL) > 0)
4008 for (jp = curjob; jp; jp = jp->prev_job) {
4009 if (!(mode & SHOW_CHANGED) || jp->changed) {
4010 showjob(out, jp, mode);
4015 static int FAST_FUNC
4016 jobscmd(int argc UNUSED_PARAM, char **argv)
4021 while ((m = nextopt("lp"))) {
4031 showjob(stdout, getjob(*argv,0), mode);
4034 showjobs(stdout, mode);
4041 getstatus(struct job *job)
4046 status = job->ps[job->nprocs - 1].status;
4047 retval = WEXITSTATUS(status);
4048 if (!WIFEXITED(status)) {
4050 retval = WSTOPSIG(status);
4051 if (!WIFSTOPPED(status))
4054 /* XXX: limits number of signals */
4055 retval = WTERMSIG(status);
4057 if (retval == SIGINT)
4063 TRACE(("getstatus: job %d, nproc %d, status 0x%x, retval 0x%x\n",
4064 jobno(job), job->nprocs, status, retval));
4068 static int FAST_FUNC
4069 waitcmd(int argc UNUSED_PARAM, char **argv)
4078 raise_exception(EXSIG);
4085 /* wait for all jobs */
4089 if (!jp) /* no running procs */
4091 if (jp->state == JOBRUNNING)
4097 * "When bash is waiting for an asynchronous command via
4098 * the wait builtin, the reception of a signal for which a trap
4099 * has been set will cause the wait builtin to return immediately
4100 * with an exit status greater than 128, immediately after which
4101 * the trap is executed."
4102 * Do we do it that way? */
4103 blocking_wait_with_raise_on_sig(NULL);
4109 if (**argv != '%') {
4110 pid_t pid = number(*argv);
4115 if (job->ps[job->nprocs - 1].pid == pid)
4117 job = job->prev_job;
4120 job = getjob(*argv, 0);
4121 /* loop until process terminated or stopped */
4122 while (job->state == JOBRUNNING)
4123 blocking_wait_with_raise_on_sig(NULL);
4125 retval = getstatus(job);
4138 struct job *jp, *jq;
4140 len = njobs * sizeof(*jp);
4142 jp = ckrealloc(jq, len + 4 * sizeof(*jp));
4144 offset = (char *)jp - (char *)jq;
4146 /* Relocate pointers */
4149 jq = (struct job *)((char *)jq + l);
4153 #define joff(p) ((struct job *)((char *)(p) + l))
4154 #define jmove(p) (p) = (void *)((char *)(p) + offset)
4155 if (joff(jp)->ps == &jq->ps0)
4156 jmove(joff(jp)->ps);
4157 if (joff(jp)->prev_job)
4158 jmove(joff(jp)->prev_job);
4168 jp = (struct job *)((char *)jp + len);
4172 } while (--jq >= jp);
4177 * Return a new job structure.
4178 * Called with interrupts off.
4181 makejob(/*union node *node,*/ int nprocs)
4186 for (i = njobs, jp = jobtab; ; jp++) {
4193 if (jp->state != JOBDONE || !jp->waited)
4202 memset(jp, 0, sizeof(*jp));
4204 /* jp->jobctl is a bitfield.
4205 * "jp->jobctl |= jobctl" likely to give awful code */
4209 jp->prev_job = curjob;
4214 jp->ps = ckmalloc(nprocs * sizeof(struct procstat));
4216 TRACE(("makejob(%d) returns %%%d\n", nprocs,
4223 * Return a string identifying a command (to be printed by the
4226 static char *cmdnextc;
4229 cmdputs(const char *s)
4231 static const char vstype[VSTYPE + 1][3] = {
4232 "", "}", "-", "+", "?", "=",
4233 "%", "%%", "#", "##"
4234 IF_ASH_BASH_COMPAT(, ":", "/", "//")
4237 const char *p, *str;
4238 char c, cc[2] = " ";
4243 nextc = makestrspace((strlen(s) + 1) * 8, cmdnextc);
4245 while ((c = *p++) != 0) {
4253 if ((subtype & VSTYPE) == VSLENGTH)
4257 if (!(subtype & VSQUOTE) == !(quoted & 1))
4263 str = "\"}" + !(quoted & 1);
4270 case CTLBACKQ+CTLQUOTE:
4273 #if ENABLE_SH_MATH_SUPPORT
4288 if ((subtype & VSTYPE) != VSNORMAL)
4290 str = vstype[subtype & VSTYPE];
4291 if (subtype & VSNUL)
4300 /* These can only happen inside quotes */
4313 while ((c = *str++)) {
4318 USTPUTC('"', nextc);
4324 /* cmdtxt() and cmdlist() call each other */
4325 static void cmdtxt(union node *n);
4328 cmdlist(union node *np, int sep)
4330 for (; np; np = np->narg.next) {
4334 if (sep && np->narg.next)
4340 cmdtxt(union node *n)
4343 struct nodelist *lp;
4354 lp = n->npipe.cmdlist;
4372 cmdtxt(n->nbinary.ch1);
4388 cmdtxt(n->nif.test);
4391 if (n->nif.elsepart) {
4394 n = n->nif.elsepart;
4410 cmdtxt(n->nbinary.ch1);
4420 cmdputs(n->nfor.var);
4422 cmdlist(n->nfor.args, 1);
4427 cmdputs(n->narg.text);
4431 cmdlist(n->ncmd.args, 1);
4432 cmdlist(n->ncmd.redirect, 0);
4445 cmdputs(n->ncase.expr->narg.text);
4447 for (np = n->ncase.cases; np; np = np->nclist.next) {
4448 cmdtxt(np->nclist.pattern);
4450 cmdtxt(np->nclist.body);
4464 #if ENABLE_ASH_BASH_COMPAT
4479 cmdputs(utoa(n->nfile.fd));
4481 if (n->type == NTOFD || n->type == NFROMFD) {
4482 cmdputs(utoa(n->ndup.dupfd));
4491 commandtext(union node *n)
4495 STARTSTACKSTR(cmdnextc);
4497 name = stackblock();
4498 TRACE(("commandtext: name %p, end %p\n\t\"%s\"\n",
4499 name, cmdnextc, cmdnextc));
4500 return ckstrdup(name);
4505 * Fork off a subshell. If we are doing job control, give the subshell its
4506 * own process group. Jp is a job structure that the job is to be added to.
4507 * N is the command that will be evaluated by the child. Both jp and n may
4508 * be NULL. The mode parameter can be one of the following:
4509 * FORK_FG - Fork off a foreground process.
4510 * FORK_BG - Fork off a background process.
4511 * FORK_NOJOB - Like FORK_FG, but don't give the process its own
4512 * process group even if job control is on.
4514 * When job control is turned off, background processes have their standard
4515 * input redirected to /dev/null (except for the second and later processes
4518 * Called with interrupts off.
4521 * Clear traps on a fork.
4528 for (tp = trap; tp < &trap[NSIG]; tp++) {
4529 if (*tp && **tp) { /* trap not NULL or "" (SIG_IGN) */
4534 setsignal(tp - trap);
4540 /* Lives far away from here, needed for forkchild */
4541 static void closescript(void);
4543 /* Called after fork(), in child */
4545 forkchild(struct job *jp, /*union node *n,*/ int mode)
4549 TRACE(("Child shell %d\n", getpid()));
4553 /* man bash: "Non-builtin commands run by bash have signal handlers
4554 * set to the values inherited by the shell from its parent".
4555 * Do we do it correctly? */
4560 /* do job control only in root shell */
4562 if (mode != FORK_NOJOB && jp->jobctl && !oldlvl) {
4565 if (jp->nprocs == 0)
4568 pgrp = jp->ps[0].pid;
4569 /* this can fail because we are doing it in the parent also */
4571 if (mode == FORK_FG)
4572 xtcsetpgrp(ttyfd, pgrp);
4577 if (mode == FORK_BG) {
4578 /* man bash: "When job control is not in effect,
4579 * asynchronous commands ignore SIGINT and SIGQUIT" */
4582 if (jp->nprocs == 0) {
4584 if (open(bb_dev_null, O_RDONLY) != 0)
4585 ash_msg_and_raise_error("can't open '%s'", bb_dev_null);
4589 if (iflag) { /* why if iflag only? */
4594 * "In all cases, bash ignores SIGQUIT. Non-builtin
4595 * commands run by bash have signal handlers
4596 * set to the values inherited by the shell
4598 * Take care of the second rule: */
4601 for (jp = curjob; jp; jp = jp->prev_job)
4606 /* Called after fork(), in parent */
4608 #define forkparent(jp, n, mode, pid) forkparent(jp, mode, pid)
4611 forkparent(struct job *jp, union node *n, int mode, pid_t pid)
4613 TRACE(("In parent shell: child = %d\n", pid));
4615 while (jobless && dowait(DOWAIT_NONBLOCK, NULL) > 0)
4621 if (mode != FORK_NOJOB && jp->jobctl) {
4624 if (jp->nprocs == 0)
4627 pgrp = jp->ps[0].pid;
4628 /* This can fail because we are doing it in the child also */
4632 if (mode == FORK_BG) {
4633 backgndpid = pid; /* set $! */
4634 set_curjob(jp, CUR_RUNNING);
4637 struct procstat *ps = &jp->ps[jp->nprocs++];
4642 if (doing_jobctl && n)
4643 ps->cmd = commandtext(n);
4649 forkshell(struct job *jp, union node *n, int mode)
4653 TRACE(("forkshell(%%%d, %p, %d) called\n", jobno(jp), n, mode));
4656 TRACE(("Fork failed, errno=%d", errno));
4659 ash_msg_and_raise_error("can't fork");
4662 forkchild(jp, /*n,*/ mode);
4664 forkparent(jp, n, mode, pid);
4669 * Wait for job to finish.
4671 * Under job control we have the problem that while a child process
4672 * is running interrupts generated by the user are sent to the child
4673 * but not to the shell. This means that an infinite loop started by
4674 * an interactive user may be hard to kill. With job control turned off,
4675 * an interactive user may place an interactive program inside a loop.
4676 * If the interactive program catches interrupts, the user doesn't want
4677 * these interrupts to also abort the loop. The approach we take here
4678 * is to have the shell ignore interrupt signals while waiting for a
4679 * foreground process to terminate, and then send itself an interrupt
4680 * signal if the child process was terminated by an interrupt signal.
4681 * Unfortunately, some programs want to do a bit of cleanup and then
4682 * exit on interrupt; unless these processes terminate themselves by
4683 * sending a signal to themselves (instead of calling exit) they will
4684 * confuse this approach.
4686 * Called with interrupts off.
4689 waitforjob(struct job *jp)
4693 TRACE(("waitforjob(%%%d) called\n", jobno(jp)));
4696 while (jp->state == JOBRUNNING) {
4697 /* In non-interactive shells, we _can_ get
4698 * a keyboard signal here and be EINTRed,
4699 * but we just loop back, waiting for command to complete.
4702 * "If bash is waiting for a command to complete and receives
4703 * a signal for which a trap has been set, the trap
4704 * will not be executed until the command completes."
4706 * Reality is that even if trap is not set, bash
4707 * will not act on the signal until command completes.
4708 * Try this. sleep5intoff.c:
4709 * #include <signal.h>
4710 * #include <unistd.h>
4713 * sigemptyset(&set);
4714 * sigaddset(&set, SIGINT);
4715 * sigaddset(&set, SIGQUIT);
4716 * sigprocmask(SIG_BLOCK, &set, NULL);
4720 * $ bash -c './sleep5intoff; echo hi'
4721 * ^C^C^C^C <--- pressing ^C once a second
4723 * $ bash -c './sleep5intoff; echo hi'
4724 * ^\^\^\^\hi <--- pressing ^\ (SIGQUIT)
4727 dowait(DOWAIT_BLOCK, jp);
4734 xtcsetpgrp(ttyfd, rootpid);
4736 * This is truly gross.
4737 * If we're doing job control, then we did a TIOCSPGRP which
4738 * caused us (the shell) to no longer be in the controlling
4739 * session -- so we wouldn't have seen any ^C/SIGINT. So, we
4740 * intuit from the subprocess exit status whether a SIGINT
4741 * occurred, and if so interrupt ourselves. Yuck. - mycroft
4743 if (jp->sigint) /* TODO: do the same with all signals */
4744 raise(SIGINT); /* ... by raise(jp->sig) instead? */
4746 if (jp->state == JOBDONE)
4753 * return 1 if there are stopped jobs, otherwise 0
4765 if (jp && jp->state == JOBSTOPPED) {
4766 out2str("You have stopped jobs.\n");
4775 /* ============ redir.c
4777 * Code for dealing with input/output redirection.
4780 #define EMPTY -2 /* marks an unused slot in redirtab */
4781 #define CLOSED -3 /* marks a slot of previously-closed fd */
4784 * Open a file in noclobber mode.
4785 * The code was copied from bash.
4788 noclobberopen(const char *fname)
4791 struct stat finfo, finfo2;
4794 * If the file exists and is a regular file, return an error
4797 r = stat(fname, &finfo);
4798 if (r == 0 && S_ISREG(finfo.st_mode)) {
4804 * If the file was not present (r != 0), make sure we open it
4805 * exclusively so that if it is created before we open it, our open
4806 * will fail. Make sure that we do not truncate an existing file.
4807 * Note that we don't turn on O_EXCL unless the stat failed -- if the
4808 * file was not a regular file, we leave O_EXCL off.
4811 return open(fname, O_WRONLY|O_CREAT|O_EXCL, 0666);
4812 fd = open(fname, O_WRONLY|O_CREAT, 0666);
4814 /* If the open failed, return the file descriptor right away. */
4819 * OK, the open succeeded, but the file may have been changed from a
4820 * non-regular file to a regular file between the stat and the open.
4821 * We are assuming that the O_EXCL open handles the case where FILENAME
4822 * did not exist and is symlinked to an existing file between the stat
4827 * If we can open it and fstat the file descriptor, and neither check
4828 * revealed that it was a regular file, and the file has not been
4829 * replaced, return the file descriptor.
4831 if (fstat(fd, &finfo2) == 0 && !S_ISREG(finfo2.st_mode)
4832 && finfo.st_dev == finfo2.st_dev && finfo.st_ino == finfo2.st_ino)
4835 /* The file has been replaced. badness. */
4842 * Handle here documents. Normally we fork off a process to write the
4843 * data to a pipe. If the document is short, we can stuff the data in
4844 * the pipe without forking.
4846 /* openhere needs this forward reference */
4847 static void expandhere(union node *arg, int fd);
4849 openhere(union node *redir)
4855 ash_msg_and_raise_error("pipe call failed");
4856 if (redir->type == NHERE) {
4857 len = strlen(redir->nhere.doc->narg.text);
4858 if (len <= PIPE_BUF) {
4859 full_write(pip[1], redir->nhere.doc->narg.text, len);
4863 if (forkshell((struct job *)NULL, (union node *)NULL, FORK_NOJOB) == 0) {
4866 ignoresig(SIGINT); //signal(SIGINT, SIG_IGN);
4867 ignoresig(SIGQUIT); //signal(SIGQUIT, SIG_IGN);
4868 ignoresig(SIGHUP); //signal(SIGHUP, SIG_IGN);
4869 ignoresig(SIGTSTP); //signal(SIGTSTP, SIG_IGN);
4870 signal(SIGPIPE, SIG_DFL);
4871 if (redir->type == NHERE)
4872 full_write(pip[1], redir->nhere.doc->narg.text, len);
4874 expandhere(redir->nhere.doc, pip[1]);
4875 _exit(EXIT_SUCCESS);
4883 openredirect(union node *redir)
4888 switch (redir->nfile.type) {
4890 fname = redir->nfile.expfname;
4891 f = open(fname, O_RDONLY);
4896 fname = redir->nfile.expfname;
4897 f = open(fname, O_RDWR|O_CREAT|O_TRUNC, 0666);
4902 #if ENABLE_ASH_BASH_COMPAT
4905 /* Take care of noclobber mode. */
4907 fname = redir->nfile.expfname;
4908 f = noclobberopen(fname);
4915 fname = redir->nfile.expfname;
4916 f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666);
4921 fname = redir->nfile.expfname;
4922 f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666);
4930 /* Fall through to eliminate warning. */
4931 /* Our single caller does this itself */
4938 f = openhere(redir);
4944 ash_msg_and_raise_error("can't create %s: %s", fname, errmsg(errno, "nonexistent directory"));
4946 ash_msg_and_raise_error("can't open %s: %s", fname, errmsg(errno, "no such file"));
4950 * Copy a file descriptor to be >= to. Returns -1
4951 * if the source file descriptor is closed, EMPTY if there are no unused
4952 * file descriptors left.
4954 /* 0x800..00: bit to set in "to" to request dup2 instead of fcntl(F_DUPFD).
4955 * old code was doing close(to) prior to copyfd() to achieve the same */
4957 COPYFD_EXACT = (int)~(INT_MAX),
4958 COPYFD_RESTORE = (int)((unsigned)COPYFD_EXACT >> 1),
4961 copyfd(int from, int to)
4965 if (to & COPYFD_EXACT) {
4966 to &= ~COPYFD_EXACT;
4968 newfd = dup2(from, to);
4970 newfd = fcntl(from, F_DUPFD, to);
4973 if (errno == EMFILE)
4975 /* Happens when source fd is not open: try "echo >&99" */
4976 ash_msg_and_raise_error("%d: %m", from);
4981 /* Struct def and variable are moved down to the first usage site */
4986 struct redirtab *next;
4989 struct two_fd_t two_fd[0];
4991 #define redirlist (G_var.redirlist)
4993 static int need_to_remember(struct redirtab *rp, int fd)
4997 if (!rp) /* remembering was not requested */
5000 for (i = 0; i < rp->pair_count; i++) {
5001 if (rp->two_fd[i].orig == fd) {
5002 /* already remembered */
5009 /* "hidden" fd is a fd used to read scripts, or a copy of such */
5010 static int is_hidden_fd(struct redirtab *rp, int fd)
5013 struct parsefile *pf;
5026 fd |= COPYFD_RESTORE;
5027 for (i = 0; i < rp->pair_count; i++) {
5028 if (rp->two_fd[i].copy == fd) {
5036 * Process a list of redirection commands. If the REDIR_PUSH flag is set,
5037 * old file descriptors are stashed away so that the redirection can be
5038 * undone by calling popredir. If the REDIR_BACKQ flag is set, then the
5039 * standard output, and the standard error if it becomes a duplicate of
5040 * stdout, is saved in memory.
5042 /* flags passed to redirect */
5043 #define REDIR_PUSH 01 /* save previous values of file descriptors */
5044 #define REDIR_SAVEFD2 03 /* set preverrout */
5046 redirect(union node *redir, int flags)
5048 struct redirtab *sv;
5053 int copied_fd2 = -1;
5063 if (flags & REDIR_PUSH) {
5064 union node *tmp = redir;
5067 #if ENABLE_ASH_BASH_COMPAT
5068 if (redir->nfile.type == NTO2)
5071 tmp = tmp->nfile.next;
5073 sv = ckmalloc(sizeof(*sv) + sv_pos * sizeof(sv->two_fd[0]));
5074 sv->next = redirlist;
5075 sv->pair_count = sv_pos;
5077 sv->nullredirs = g_nullredirs - 1;
5079 while (sv_pos > 0) {
5081 sv->two_fd[sv_pos].orig = sv->two_fd[sv_pos].copy = EMPTY;
5086 fd = redir->nfile.fd;
5087 if (redir->nfile.type == NTOFD || redir->nfile.type == NFROMFD) {
5088 int right_fd = redir->ndup.dupfd;
5089 /* redirect from/to same file descriptor? */
5092 /* echo >&10 and 10 is a fd opened to the sh script? */
5093 if (is_hidden_fd(sv, right_fd)) {
5094 errno = EBADF; /* as if it is closed */
5095 ash_msg_and_raise_error("%d: %m", right_fd);
5099 newfd = openredirect(redir); /* always >= 0 */
5101 /* Descriptor wasn't open before redirect.
5102 * Mark it for close in the future */
5103 if (need_to_remember(sv, fd)) {
5104 goto remember_to_close;
5109 #if ENABLE_ASH_BASH_COMPAT
5112 if (need_to_remember(sv, fd)) {
5113 /* Copy old descriptor */
5114 i = fcntl(fd, F_DUPFD, 10);
5115 /* You'd expect copy to be CLOEXECed. Currently these extra "saved" fds
5116 * are closed in popredir() in the child, preventing them from leaking
5117 * into child. (popredir() also cleans up the mess in case of failures)
5122 /* Strange error (e.g. "too many files" EMFILE?) */
5126 ash_msg_and_raise_error("%d: %m", fd);
5129 /* EBADF: it is not open - good, remember to close it */
5132 } else { /* fd is open, save its copy */
5133 /* "exec fd>&-" should not close fds
5134 * which point to script file(s).
5135 * Force them to be restored afterwards */
5136 if (is_hidden_fd(sv, fd))
5137 i |= COPYFD_RESTORE;
5141 sv->two_fd[sv_pos].orig = fd;
5142 sv->two_fd[sv_pos].copy = i;
5146 /* NTOFD/NFROMFD: copy redir->ndup.dupfd to fd */
5147 if (redir->ndup.dupfd < 0) { /* "fd>&-" */
5148 /* Don't want to trigger debugging */
5152 copyfd(redir->ndup.dupfd, fd | COPYFD_EXACT);
5154 } else if (fd != newfd) { /* move newfd to fd */
5155 copyfd(newfd, fd | COPYFD_EXACT);
5156 #if ENABLE_ASH_BASH_COMPAT
5157 if (!(redir->nfile.type == NTO2 && fd == 2))
5161 #if ENABLE_ASH_BASH_COMPAT
5162 if (redir->nfile.type == NTO2 && fd == 1) {
5163 /* We already redirected it to fd 1, now copy it to 2 */
5169 } while ((redir = redir->nfile.next) != NULL);
5172 if ((flags & REDIR_SAVEFD2) && copied_fd2 >= 0)
5173 preverrout_fd = copied_fd2;
5177 * Undo the effects of the last redirection.
5180 popredir(int drop, int restore)
5182 struct redirtab *rp;
5185 if (--g_nullredirs >= 0)
5189 for (i = 0; i < rp->pair_count; i++) {
5190 int fd = rp->two_fd[i].orig;
5191 int copy = rp->two_fd[i].copy;
5192 if (copy == CLOSED) {
5197 if (copy != EMPTY) {
5198 if (!drop || (restore && (copy & COPYFD_RESTORE))) {
5199 copy &= ~COPYFD_RESTORE;
5201 copyfd(copy, fd | COPYFD_EXACT);
5203 close(copy & ~COPYFD_RESTORE);
5206 redirlist = rp->next;
5207 g_nullredirs = rp->nullredirs;
5213 * Undo all redirections. Called on error or interrupt.
5217 * Discard all saved file descriptors.
5220 clearredir(int drop)
5226 popredir(drop, /*restore:*/ 0);
5231 redirectsafe(union node *redir, int flags)
5234 volatile int saveint;
5235 struct jmploc *volatile savehandler = exception_handler;
5236 struct jmploc jmploc;
5239 /* "echo 9>/dev/null; echo >&9; echo result: $?" - result should be 1, not 2! */
5240 err = setjmp(jmploc.loc); // huh?? was = setjmp(jmploc.loc) * 2;
5242 exception_handler = &jmploc;
5243 redirect(redir, flags);
5245 exception_handler = savehandler;
5246 if (err && exception_type != EXERROR)
5247 longjmp(exception_handler->loc, 1);
5248 RESTORE_INT(saveint);
5253 /* ============ Routines to expand arguments to commands
5255 * We have to deal with backquotes, shell variables, and file metacharacters.
5258 #if ENABLE_SH_MATH_SUPPORT
5260 ash_arith(const char *s)
5262 arith_eval_hooks_t math_hooks;
5266 math_hooks.lookupvar = lookupvar;
5267 math_hooks.setvar = setvar;
5268 math_hooks.endofname = endofname;
5271 result = arith(s, &errcode, &math_hooks);
5274 ash_msg_and_raise_error("exponent less than 0");
5276 ash_msg_and_raise_error("divide by zero");
5278 ash_msg_and_raise_error("expression recursion loop detected");
5279 raise_error_syntax(s);
5290 #define EXP_FULL 0x1 /* perform word splitting & file globbing */
5291 #define EXP_TILDE 0x2 /* do normal tilde expansion */
5292 #define EXP_VARTILDE 0x4 /* expand tildes in an assignment */
5293 #define EXP_REDIR 0x8 /* file glob for a redirection (1 match only) */
5294 #define EXP_CASE 0x10 /* keeps quotes around for CASE pattern */
5295 #define EXP_RECORD 0x20 /* need to record arguments for ifs breakup */
5296 #define EXP_VARTILDE2 0x40 /* expand tildes after colons only */
5297 #define EXP_WORD 0x80 /* expand word in parameter expansion */
5298 #define EXP_QWORD 0x100 /* expand word in quoted parameter expansion */
5302 #define RMESCAPE_ALLOC 0x1 /* Allocate a new string */
5303 #define RMESCAPE_GLOB 0x2 /* Add backslashes for glob */
5304 #define RMESCAPE_QUOTED 0x4 /* Remove CTLESC unless in quotes */
5305 #define RMESCAPE_GROW 0x8 /* Grow strings instead of stalloc */
5306 #define RMESCAPE_HEAP 0x10 /* Malloc strings instead of stalloc */
5309 * Structure specifying which parts of the string should be searched
5310 * for IFS characters.
5313 struct ifsregion *next; /* next region in list */
5314 int begoff; /* offset of start of region */
5315 int endoff; /* offset of end of region */
5316 int nulonly; /* search for nul bytes only */
5320 struct strlist *list;
5321 struct strlist **lastp;
5324 /* output of current string */
5325 static char *expdest;
5326 /* list of back quote expressions */
5327 static struct nodelist *argbackq;
5328 /* first struct in list of ifs regions */
5329 static struct ifsregion ifsfirst;
5330 /* last struct in list */
5331 static struct ifsregion *ifslastp;
5332 /* holds expanded arg list */
5333 static struct arglist exparg;
5343 expdest = makestrspace(32, expdest);
5344 len = fmtstr(expdest, 32, arith_t_fmt, num);
5345 STADJUST(len, expdest);
5350 esclen(const char *start, const char *p)
5354 while (p > start && *--p == CTLESC) {
5361 * Remove any CTLESC characters from a string.
5364 _rmescapes(char *str, int flag)
5366 static const char qchars[] ALIGN1 = { CTLESC, CTLQUOTEMARK, '\0' };
5373 p = strpbrk(str, qchars);
5379 if (flag & RMESCAPE_ALLOC) {
5380 size_t len = p - str;
5381 size_t fulllen = len + strlen(p) + 1;
5383 if (flag & RMESCAPE_GROW) {
5384 r = makestrspace(fulllen, expdest);
5385 } else if (flag & RMESCAPE_HEAP) {
5386 r = ckmalloc(fulllen);
5388 r = stalloc(fulllen);
5392 q = (char *)memcpy(q, str, len) + len;
5395 inquotes = (flag & RMESCAPE_QUOTED) ^ RMESCAPE_QUOTED;
5396 globbing = flag & RMESCAPE_GLOB;
5397 notescaped = globbing;
5399 if (*p == CTLQUOTEMARK) {
5400 inquotes = ~inquotes;
5402 notescaped = globbing;
5406 /* naked back slash */
5412 if (notescaped && inquotes && *p != '/') {
5416 notescaped = globbing;
5421 if (flag & RMESCAPE_GROW) {
5423 STADJUST(q - r + 1, expdest);
5427 #define rmescapes(p) _rmescapes((p), 0)
5429 #define pmatch(a, b) !fnmatch((a), (b), 0)
5432 * Prepare a pattern for a expmeta (internal glob(3)) call.
5434 * Returns an stalloced string.
5437 preglob(const char *pattern, int quoted, int flag)
5439 flag |= RMESCAPE_GLOB;
5441 flag |= RMESCAPE_QUOTED;
5443 return _rmescapes((char *)pattern, flag);
5447 * Put a string on the stack.
5450 memtodest(const char *p, size_t len, int syntax, int quotes)
5454 q = makestrspace(len * 2, q);
5457 int c = signed_char2int(*p++);
5460 if (quotes && (SIT(c, syntax) == CCTL || SIT(c, syntax) == CBACK))
5469 strtodest(const char *p, int syntax, int quotes)
5471 memtodest(p, strlen(p), syntax, quotes);
5475 * Record the fact that we have to scan this region of the
5476 * string for IFS characters.
5479 recordregion(int start, int end, int nulonly)
5481 struct ifsregion *ifsp;
5483 if (ifslastp == NULL) {
5487 ifsp = ckzalloc(sizeof(*ifsp));
5488 /*ifsp->next = NULL; - ckzalloc did it */
5489 ifslastp->next = ifsp;
5493 ifslastp->begoff = start;
5494 ifslastp->endoff = end;
5495 ifslastp->nulonly = nulonly;
5499 removerecordregions(int endoff)
5501 if (ifslastp == NULL)
5504 if (ifsfirst.endoff > endoff) {
5505 while (ifsfirst.next != NULL) {
5506 struct ifsregion *ifsp;
5508 ifsp = ifsfirst.next->next;
5509 free(ifsfirst.next);
5510 ifsfirst.next = ifsp;
5513 if (ifsfirst.begoff > endoff)
5516 ifslastp = &ifsfirst;
5517 ifsfirst.endoff = endoff;
5522 ifslastp = &ifsfirst;
5523 while (ifslastp->next && ifslastp->next->begoff < endoff)
5524 ifslastp=ifslastp->next;
5525 while (ifslastp->next != NULL) {
5526 struct ifsregion *ifsp;
5528 ifsp = ifslastp->next->next;
5529 free(ifslastp->next);
5530 ifslastp->next = ifsp;
5533 if (ifslastp->endoff > endoff)
5534 ifslastp->endoff = endoff;
5538 exptilde(char *startp, char *p, int flag)
5544 int quotes = flag & (EXP_FULL | EXP_CASE);
5549 while ((c = *++p) != '\0') {
5556 if (flag & EXP_VARTILDE)
5566 if (*name == '\0') {
5567 home = lookupvar(homestr);
5569 pw = getpwnam(name);
5574 if (!home || !*home)
5577 startloc = expdest - (char *)stackblock();
5578 strtodest(home, SQSYNTAX, quotes);
5579 recordregion(startloc, expdest - (char *)stackblock(), 0);
5587 * Execute a command inside back quotes. If it's a builtin command, we
5588 * want to save its output in a block obtained from malloc. Otherwise
5589 * we fork off a subprocess and get the output of the command via a pipe.
5590 * Should be called with interrupts off.
5592 struct backcmd { /* result of evalbackcmd */
5593 int fd; /* file descriptor to read from */
5594 int nleft; /* number of chars in buffer */
5595 char *buf; /* buffer */
5596 struct job *jp; /* job structure for command */
5599 /* These forward decls are needed to use "eval" code for backticks handling: */
5600 static uint8_t back_exitstatus; /* exit status of backquoted command */
5601 #define EV_EXIT 01 /* exit after evaluating tree */
5602 static void evaltree(union node *, int);
5604 static void FAST_FUNC
5605 evalbackcmd(union node *n, struct backcmd *result)
5616 saveherefd = herefd;
5624 ash_msg_and_raise_error("pipe call failed");
5625 jp = makejob(/*n,*/ 1);
5626 if (forkshell(jp, n, FORK_NOJOB) == 0) {
5631 copyfd(pip[1], 1 | COPYFD_EXACT);
5635 evaltree(n, EV_EXIT); /* actually evaltreenr... */
5639 result->fd = pip[0];
5642 herefd = saveherefd;
5644 TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n",
5645 result->fd, result->buf, result->nleft, result->jp));
5649 * Expand stuff in backwards quotes.
5652 expbackq(union node *cmd, int quoted, int quotes)
5660 int syntax = quoted ? DQSYNTAX : BASESYNTAX;
5661 struct stackmark smark;
5664 setstackmark(&smark);
5666 startloc = dest - (char *)stackblock();
5668 evalbackcmd(cmd, &in);
5669 popstackmark(&smark);
5676 memtodest(p, i, syntax, quotes);
5680 i = nonblock_safe_read(in.fd, buf, sizeof(buf));
5681 TRACE(("expbackq: read returns %d\n", i));
5690 back_exitstatus = waitforjob(in.jp);
5694 /* Eat all trailing newlines */
5696 for (; dest > (char *)stackblock() && dest[-1] == '\n';)
5701 recordregion(startloc, dest - (char *)stackblock(), 0);
5702 TRACE(("evalbackq: size=%d: \"%.*s\"\n",
5703 (dest - (char *)stackblock()) - startloc,
5704 (dest - (char *)stackblock()) - startloc,
5705 stackblock() + startloc));
5708 #if ENABLE_SH_MATH_SUPPORT
5710 * Expand arithmetic expression. Backup to start of expression,
5711 * evaluate, place result in (backed up) result, adjust string position.
5724 * This routine is slightly over-complicated for
5725 * efficiency. Next we scan backwards looking for the
5726 * start of arithmetic.
5728 start = stackblock();
5735 while (*p != CTLARI) {
5739 ash_msg_and_raise_error("missing CTLARI (shouldn't happen)");
5744 esc = esclen(start, p);
5754 removerecordregions(begoff);
5763 len = cvtnum(ash_arith(p + 2));
5766 recordregion(begoff, begoff + len, 0);
5770 /* argstr needs it */
5771 static char *evalvar(char *p, int flag, struct strlist *var_str_list);
5774 * Perform variable and command substitution. If EXP_FULL is set, output CTLESC
5775 * characters to allow for further processing. Otherwise treat
5776 * $@ like $* since no splitting will be performed.
5778 * var_str_list (can be NULL) is a list of "VAR=val" strings which take precedence
5779 * over shell varables. Needed for "A=a B=$A; echo $B" case - we use it
5780 * for correct expansion of "B=$A" word.
5783 argstr(char *p, int flag, struct strlist *var_str_list)
5785 static const char spclchars[] ALIGN1 = {
5793 CTLBACKQ | CTLQUOTE,
5794 #if ENABLE_SH_MATH_SUPPORT
5799 const char *reject = spclchars;
5801 int quotes = flag & (EXP_FULL | EXP_CASE); /* do CTLESC */
5802 int breakall = flag & EXP_WORD;
5807 if (!(flag & EXP_VARTILDE)) {
5809 } else if (flag & EXP_VARTILDE2) {
5814 if (flag & EXP_TILDE) {
5820 if (*q == CTLESC && (flag & EXP_QWORD))
5823 p = exptilde(p, q, flag);
5826 startloc = expdest - (char *)stackblock();
5828 length += strcspn(p + length, reject);
5830 if (c && (!(c & 0x80)
5831 #if ENABLE_SH_MATH_SUPPORT
5835 /* c == '=' || c == ':' || c == CTLENDARI */
5840 expdest = stack_nputstr(p, length, expdest);
5841 newloc = expdest - (char *)stackblock();
5842 if (breakall && !inquotes && newloc > startloc) {
5843 recordregion(startloc, newloc, 0);
5854 if (flag & EXP_VARTILDE2) {
5858 flag |= EXP_VARTILDE2;
5863 * sort of a hack - expand tildes in variable
5864 * assignments (after the first '=' and after ':'s).
5873 case CTLENDVAR: /* ??? */
5876 /* "$@" syntax adherence hack */
5879 !memcmp(p, dolatstr, 4) &&
5880 (p[4] == CTLQUOTEMARK || (
5881 p[4] == CTLENDVAR &&
5882 p[5] == CTLQUOTEMARK
5885 p = evalvar(p + 1, flag, /* var_str_list: */ NULL) + 1;
5888 inquotes = !inquotes;
5901 p = evalvar(p, flag, var_str_list);
5905 case CTLBACKQ|CTLQUOTE:
5906 expbackq(argbackq->n, c, quotes);
5907 argbackq = argbackq->next;
5909 #if ENABLE_SH_MATH_SUPPORT
5922 scanleft(char *startp, char *rmesc, char *rmescend UNUSED_PARAM, char *str, int quotes,
5925 // This commented out code was added by James Simmons <jsimmons@infradead.org>
5926 // as part of a larger change when he added support for ${var/a/b}.
5927 // However, it broke # and % operators:
5931 //echo ${var#ab} abcdcd abcdcd
5932 //echo ${var##ab} abcdcd abcdcd
5933 //echo ${var#a*b} abcdcd ababcdcd (!)
5934 //echo ${var##a*b} cdcd cdcd
5935 //echo ${var#?} babcdcd ababcdcd (!)
5936 //echo ${var##?} babcdcd babcdcd
5937 //echo ${var#*} ababcdcd babcdcd (!)
5939 //echo ${var%cd} ababcd ababcd
5940 //echo ${var%%cd} ababcd abab (!)
5941 //echo ${var%c*d} ababcd ababcd
5942 //echo ${var%%c*d} abab ababcdcd (!)
5943 //echo ${var%?} ababcdc ababcdc
5944 //echo ${var%%?} ababcdc ababcdcd (!)
5945 //echo ${var%*} ababcdcd ababcdcd
5948 // Commenting it back out helped. Remove it completely if it really
5951 char *loc, *loc2; //, *full;
5957 int match; // = strlen(str);
5958 const char *s = loc2;
5965 match = pmatch(str, s); // this line was deleted
5967 // // chop off end if its '*'
5968 // full = strrchr(str, '*');
5969 // if (full && full != str)
5972 // // If str starts with '*' replace with s.
5973 // if ((*str == '*') && strlen(s) >= match) {
5974 // full = xstrdup(s);
5975 // strncpy(full+strlen(s)-match+1, str+1, match-1);
5977 // full = xstrndup(str, match);
5978 // match = strncmp(s, full, strlen(full));
5982 if (match) // if (!match)
5984 if (quotes && *loc == CTLESC)
5993 scanright(char *startp, char *rmesc, char *rmescend, char *str, int quotes,
6000 for (loc = str - 1, loc2 = rmescend; loc >= startp; loc2--) {
6003 const char *s = loc2;
6008 match = pmatch(str, s);
6015 esc = esclen(startp, loc);
6026 static void varunset(const char *, const char *, const char *, int) NORETURN;
6028 varunset(const char *end, const char *var, const char *umsg, int varflags)
6034 msg = "parameter not set";
6036 if (*end == CTLENDVAR) {
6037 if (varflags & VSNUL)
6043 ash_msg_and_raise_error("%.*s: %s%s", end - var - 1, var, msg, tail);
6046 #if ENABLE_ASH_BASH_COMPAT
6048 parse_sub_pattern(char *arg, int inquotes)
6050 char *idx, *repl = NULL;
6059 /* Only the first '/' seen is our separator */
6066 if (!inquotes && c == '\\' && arg[1] == '\\')
6067 arg++; /* skip both \\, not just first one */
6074 #endif /* ENABLE_ASH_BASH_COMPAT */
6077 subevalvar(char *p, char *str, int strloc, int subtype,
6078 int startloc, int varflags, int quotes, struct strlist *var_str_list)
6080 struct nodelist *saveargbackq = argbackq;
6083 char *rmesc, *rmescend;
6084 IF_ASH_BASH_COMPAT(char *repl = NULL;)
6085 IF_ASH_BASH_COMPAT(char null = '\0';)
6086 IF_ASH_BASH_COMPAT(int pos, len, orig_len;)
6087 int saveherefd = herefd;
6088 int amount, workloc, resetloc;
6090 char *(*scan)(char*, char*, char*, char*, int, int);
6093 argstr(p, (subtype != VSASSIGN && subtype != VSQUESTION) ? EXP_CASE : 0,
6095 STPUTC('\0', expdest);
6096 herefd = saveherefd;
6097 argbackq = saveargbackq;
6098 startp = (char *)stackblock() + startloc;
6102 setvar(str, startp, 0);
6103 amount = startp - expdest;
6104 STADJUST(amount, expdest);
6107 #if ENABLE_ASH_BASH_COMPAT
6109 loc = str = stackblock() + strloc;
6110 // TODO: number() instead? It does error checking...
6112 len = str - startp - 1;
6114 /* *loc != '\0', guaranteed by parser */
6118 /* We must adjust the length by the number of escapes we find. */
6119 for (ptr = startp; ptr < (str - 1); ptr++) {
6120 if (*ptr == CTLESC) {
6128 if (*loc++ == ':') {
6129 // TODO: number() instead? It does error checking...
6133 while (*loc && *loc != ':')
6136 // TODO: number() instead? It does error checking...
6139 if (pos >= orig_len) {
6143 if (len > (orig_len - pos))
6144 len = orig_len - pos;
6146 for (str = startp; pos; str++, pos--) {
6147 if (quotes && *str == CTLESC)
6150 for (loc = startp; len; len--) {
6151 if (quotes && *str == CTLESC)
6156 amount = loc - expdest;
6157 STADJUST(amount, expdest);
6162 varunset(p, str, startp, varflags);
6165 resetloc = expdest - (char *)stackblock();
6167 /* We'll comeback here if we grow the stack while handling
6168 * a VSREPLACE or VSREPLACEALL, since our pointers into the
6169 * stack will need rebasing, and we'll need to remove our work
6172 IF_ASH_BASH_COMPAT(restart:)
6174 amount = expdest - ((char *)stackblock() + resetloc);
6175 STADJUST(-amount, expdest);
6176 startp = (char *)stackblock() + startloc;
6179 rmescend = (char *)stackblock() + strloc;
6181 rmesc = _rmescapes(startp, RMESCAPE_ALLOC | RMESCAPE_GROW);
6182 if (rmesc != startp) {
6184 startp = (char *)stackblock() + startloc;
6188 str = (char *)stackblock() + strloc;
6189 preglob(str, varflags & VSQUOTE, 0);
6190 workloc = expdest - (char *)stackblock();
6192 #if ENABLE_ASH_BASH_COMPAT
6193 if (subtype == VSREPLACE || subtype == VSREPLACEALL) {
6194 char *idx, *end, *restart_detect;
6197 repl = parse_sub_pattern(str, varflags & VSQUOTE);
6202 /* If there's no pattern to match, return the expansion unmolested */
6210 loc = scanright(idx, rmesc, rmescend, str, quotes, 1);
6212 /* No match, advance */
6213 restart_detect = stackblock();
6214 STPUTC(*idx, expdest);
6215 if (quotes && *idx == CTLESC) {
6218 STPUTC(*idx, expdest);
6220 if (stackblock() != restart_detect)
6228 if (subtype == VSREPLACEALL) {
6230 if (quotes && *idx == CTLESC)
6239 for (loc = repl; *loc; loc++) {
6240 restart_detect = stackblock();
6241 STPUTC(*loc, expdest);
6242 if (stackblock() != restart_detect)
6247 if (subtype == VSREPLACE) {
6249 restart_detect = stackblock();
6250 STPUTC(*idx, expdest);
6251 if (stackblock() != restart_detect)
6260 /* We've put the replaced text into a buffer at workloc, now
6261 * move it to the right place and adjust the stack.
6263 startp = stackblock() + startloc;
6264 STPUTC('\0', expdest);
6265 memmove(startp, stackblock() + workloc, len);
6266 startp[len++] = '\0';
6267 amount = expdest - ((char *)stackblock() + startloc + len - 1);
6268 STADJUST(-amount, expdest);
6271 #endif /* ENABLE_ASH_BASH_COMPAT */
6273 subtype -= VSTRIMRIGHT;
6275 if (subtype < 0 || subtype > 7)
6278 /* zero = subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX */
6279 zero = subtype >> 1;
6280 /* VSTRIMLEFT/VSTRIMRIGHTMAX -> scanleft */
6281 scan = (subtype & 1) ^ zero ? scanleft : scanright;
6283 loc = scan(startp, rmesc, rmescend, str, quotes, zero);
6286 memmove(startp, loc, str - loc);
6287 loc = startp + (str - loc) - 1;
6290 amount = loc - expdest;
6291 STADJUST(amount, expdest);
6297 * Add the value of a specialized variable to the stack string.
6300 varvalue(char *name, int varflags, int flags, struct strlist *var_str_list)
6310 int quoted = varflags & VSQUOTE;
6311 int subtype = varflags & VSTYPE;
6312 int quotes = flags & (EXP_FULL | EXP_CASE);
6314 if (quoted && (flags & EXP_FULL))
6315 sep = 1 << CHAR_BIT;
6317 syntax = quoted ? DQSYNTAX : BASESYNTAX;
6326 num = shellparam.nparam;
6336 expdest = makestrspace(NOPTS, expdest);
6337 for (i = NOPTS - 1; i >= 0; i--) {
6339 USTPUTC(optletters(i), expdest);
6349 sep = ifsset() ? signed_char2int(ifsval()[0]) : ' ';
6350 if (quotes && (SIT(sep, syntax) == CCTL || SIT(sep, syntax) == CBACK))
6356 while ((p = *ap++)) {
6359 partlen = strlen(p);
6362 if (!(subtype == VSPLUS || subtype == VSLENGTH))
6363 memtodest(p, partlen, syntax, quotes);
6369 if (subtype == VSPLUS || subtype == VSLENGTH) {
6390 // TODO: number() instead? It does error checking...
6392 if (num < 0 || num > shellparam.nparam)
6394 p = num ? shellparam.p[num - 1] : arg0;
6397 /* NB: name has form "VAR=..." */
6399 /* "A=a B=$A" case: var_str_list is a list of "A=a" strings
6400 * which should be considered before we check variables. */
6402 unsigned name_len = (strchrnul(name, '=') - name) + 1;
6406 str = var_str_list->text;
6407 eq = strchr(str, '=');
6408 if (!eq) /* stop at first non-assignment */
6411 if (name_len == (unsigned)(eq - str)
6412 && strncmp(str, name, name_len) == 0) {
6414 /* goto value; - WRONG! */
6415 /* think "A=1 A=2 B=$A" */
6417 var_str_list = var_str_list->next;
6418 } while (var_str_list);
6422 p = lookupvar(name);
6428 if (!(subtype == VSPLUS || subtype == VSLENGTH))
6429 memtodest(p, len, syntax, quotes);
6433 if (subtype == VSPLUS || subtype == VSLENGTH)
6434 STADJUST(-len, expdest);
6439 * Expand a variable, and return a pointer to the next character in the
6443 evalvar(char *p, int flag, struct strlist *var_str_list)
6455 subtype = varflags & VSTYPE;
6456 quoted = varflags & VSQUOTE;
6458 easy = (!quoted || (*var == '@' && shellparam.nparam));
6459 startloc = expdest - (char *)stackblock();
6460 p = strchr(p, '=') + 1;
6463 varlen = varvalue(var, varflags, flag, var_str_list);
6464 if (varflags & VSNUL)
6467 if (subtype == VSPLUS) {
6468 varlen = -1 - varlen;
6472 if (subtype == VSMINUS) {
6476 p, flag | EXP_TILDE |
6477 (quoted ? EXP_QWORD : EXP_WORD),
6487 if (subtype == VSASSIGN || subtype == VSQUESTION) {
6489 if (subevalvar(p, var, /* strloc: */ 0,
6490 subtype, startloc, varflags,
6496 * Remove any recorded regions beyond
6499 removerecordregions(startloc);
6509 if (varlen < 0 && uflag)
6510 varunset(p, var, 0, 0);
6512 if (subtype == VSLENGTH) {
6513 cvtnum(varlen > 0 ? varlen : 0);
6517 if (subtype == VSNORMAL) {
6528 case VSTRIMRIGHTMAX:
6529 #if ENABLE_ASH_BASH_COMPAT
6542 * Terminate the string and start recording the pattern
6545 STPUTC('\0', expdest);
6546 patloc = expdest - (char *)stackblock();
6547 if (0 == subevalvar(p, /* str: */ NULL, patloc, subtype,
6549 /* quotes: */ flag & (EXP_FULL | EXP_CASE),
6552 int amount = expdest - (
6553 (char *)stackblock() + patloc - 1
6555 STADJUST(-amount, expdest);
6557 /* Remove any recorded regions beyond start of variable */
6558 removerecordregions(startloc);
6560 recordregion(startloc, expdest - (char *)stackblock(), quoted);
6564 if (subtype != VSNORMAL) { /* skip to end of alternative */
6570 else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) {
6572 argbackq = argbackq->next;
6573 } else if (c == CTLVAR) {
6574 if ((*p++ & VSTYPE) != VSNORMAL)
6576 } else if (c == CTLENDVAR) {
6586 * Break the argument string into pieces based upon IFS and add the
6587 * strings to the argument list. The regions of the string to be
6588 * searched for IFS characters have been stored by recordregion.
6591 ifsbreakup(char *string, struct arglist *arglist)
6593 struct ifsregion *ifsp;
6598 const char *ifs, *realifs;
6603 if (ifslastp != NULL) {
6606 realifs = ifsset() ? ifsval() : defifs;
6609 p = string + ifsp->begoff;
6610 nulonly = ifsp->nulonly;
6611 ifs = nulonly ? nullstr : realifs;
6613 while (p < string + ifsp->endoff) {
6617 if (!strchr(ifs, *p)) {
6622 ifsspc = (strchr(defifs, *p) != NULL);
6623 /* Ignore IFS whitespace at start */
6624 if (q == start && ifsspc) {
6630 sp = stzalloc(sizeof(*sp));
6632 *arglist->lastp = sp;
6633 arglist->lastp = &sp->next;
6637 if (p >= string + ifsp->endoff) {
6643 if (strchr(ifs, *p) == NULL) {
6647 if (strchr(defifs, *p) == NULL) {
6662 } while (ifsp != NULL);
6671 sp = stzalloc(sizeof(*sp));
6673 *arglist->lastp = sp;
6674 arglist->lastp = &sp->next;
6680 struct ifsregion *p;
6685 struct ifsregion *ifsp;
6691 ifsfirst.next = NULL;
6696 * Add a file name to the list.
6699 addfname(const char *name)
6703 sp = stzalloc(sizeof(*sp));
6704 sp->text = ststrdup(name);
6706 exparg.lastp = &sp->next;
6709 static char *expdir;
6712 * Do metacharacter (i.e. *, ?, [...]) expansion.
6715 expmeta(char *enddir, char *name)
6730 for (p = name; *p; p++) {
6731 if (*p == '*' || *p == '?')
6733 else if (*p == '[') {
6740 if (*q == '/' || *q == '\0')
6747 } else if (*p == '\\')
6749 else if (*p == '/') {
6756 if (metaflag == 0) { /* we've reached the end of the file name */
6757 if (enddir != expdir)
6765 if (metaflag == 0 || lstat(expdir, &statb) >= 0)
6776 } while (p < start);
6778 if (enddir == expdir) {
6780 } else if (enddir == expdir + 1 && *expdir == '/') {
6789 if (enddir != expdir)
6791 if (*endname == 0) {
6803 while (!intpending && (dp = readdir(dirp)) != NULL) {
6804 if (dp->d_name[0] == '.' && !matchdot)
6806 if (pmatch(start, dp->d_name)) {
6808 strcpy(enddir, dp->d_name);
6811 for (p = enddir, cp = dp->d_name; (*p++ = *cp++) != '\0';)
6814 expmeta(p, endname);
6823 static struct strlist *
6824 msort(struct strlist *list, int len)
6826 struct strlist *p, *q = NULL;
6827 struct strlist **lpp;
6835 for (n = half; --n >= 0;) {
6839 q->next = NULL; /* terminate first half of list */
6840 q = msort(list, half); /* sort first half of list */
6841 p = msort(p, len - half); /* sort second half */
6844 #if ENABLE_LOCALE_SUPPORT
6845 if (strcoll(p->text, q->text) < 0)
6847 if (strcmp(p->text, q->text) < 0)
6871 * Sort the results of file name expansion. It calculates the number of
6872 * strings to sort and then calls msort (short for merge sort) to do the
6875 static struct strlist *
6876 expsort(struct strlist *str)
6882 for (sp = str; sp; sp = sp->next)
6884 return msort(str, len);
6888 expandmeta(struct strlist *str /*, int flag*/)
6890 static const char metachars[] ALIGN1 = {
6893 /* TODO - EXP_REDIR */
6896 struct strlist **savelastp;
6902 if (!strpbrk(str->text, metachars))
6904 savelastp = exparg.lastp;
6907 p = preglob(str->text, 0, RMESCAPE_ALLOC | RMESCAPE_HEAP);
6909 int i = strlen(str->text);
6910 expdir = ckmalloc(i < 2048 ? 2048 : i); /* XXX */
6918 if (exparg.lastp == savelastp) {
6923 *exparg.lastp = str;
6924 rmescapes(str->text);
6925 exparg.lastp = &str->next;
6927 *exparg.lastp = NULL;
6928 *savelastp = sp = expsort(*savelastp);
6929 while (sp->next != NULL)
6931 exparg.lastp = &sp->next;
6938 * Perform variable substitution and command substitution on an argument,
6939 * placing the resulting list of arguments in arglist. If EXP_FULL is true,
6940 * perform splitting and file name expansion. When arglist is NULL, perform
6941 * here document expansion.
6944 expandarg(union node *arg, struct arglist *arglist, int flag)
6949 argbackq = arg->narg.backquote;
6950 STARTSTACKSTR(expdest);
6951 ifsfirst.next = NULL;
6953 argstr(arg->narg.text, flag,
6954 /* var_str_list: */ arglist ? arglist->list : NULL);
6955 p = _STPUTC('\0', expdest);
6957 if (arglist == NULL) {
6958 return; /* here document expanded */
6960 p = grabstackstr(p);
6961 exparg.lastp = &exparg.list;
6965 if (flag & EXP_FULL) {
6966 ifsbreakup(p, &exparg);
6967 *exparg.lastp = NULL;
6968 exparg.lastp = &exparg.list;
6969 expandmeta(exparg.list /*, flag*/);
6971 if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */
6973 sp = stzalloc(sizeof(*sp));
6976 exparg.lastp = &sp->next;
6980 *exparg.lastp = NULL;
6982 *arglist->lastp = exparg.list;
6983 arglist->lastp = exparg.lastp;
6988 * Expand shell variables and backquotes inside a here document.
6991 expandhere(union node *arg, int fd)
6994 expandarg(arg, (struct arglist *)NULL, 0);
6995 full_write(fd, stackblock(), expdest - (char *)stackblock());
6999 * Returns true if the pattern matches the string.
7002 patmatch(char *pattern, const char *string)
7004 return pmatch(preglob(pattern, 0, 0), string);
7008 * See if a pattern matches in a case statement.
7011 casematch(union node *pattern, char *val)
7013 struct stackmark smark;
7016 setstackmark(&smark);
7017 argbackq = pattern->narg.backquote;
7018 STARTSTACKSTR(expdest);
7020 argstr(pattern->narg.text, EXP_TILDE | EXP_CASE,
7021 /* var_str_list: */ NULL);
7022 STACKSTRNUL(expdest);
7023 result = patmatch(stackblock(), val);
7024 popstackmark(&smark);
7029 /* ============ find_command */
7033 int (*builtin)(int, char **) FAST_FUNC;
7034 /* unsigned flags; */
7036 #define IS_BUILTIN_SPECIAL(b) ((b)->name[0] & 1)
7037 /* "regular" builtins always take precedence over commands,
7038 * regardless of PATH=....%builtin... position */
7039 #define IS_BUILTIN_REGULAR(b) ((b)->name[0] & 2)
7040 #define IS_BUILTIN_ASSIGN(b) ((b)->name[0] & 4)
7043 smallint cmdtype; /* CMDxxx */
7046 /* index >= 0 for commands without path (slashes) */
7047 /* (TODO: what exactly does the value mean? PATH position?) */
7048 /* index == -1 for commands with slashes */
7049 /* index == (-2 - applet_no) for NOFORK applets */
7050 const struct builtincmd *cmd;
7051 struct funcnode *func;
7054 /* values of cmdtype */
7055 #define CMDUNKNOWN -1 /* no entry in table for command */
7056 #define CMDNORMAL 0 /* command is an executable program */
7057 #define CMDFUNCTION 1 /* command is a shell function */
7058 #define CMDBUILTIN 2 /* command is a shell builtin */
7060 /* action to find_command() */
7061 #define DO_ERR 0x01 /* prints errors */
7062 #define DO_ABS 0x02 /* checks absolute paths */
7063 #define DO_NOFUNC 0x04 /* don't return shell functions, for command */
7064 #define DO_ALTPATH 0x08 /* using alternate path */
7065 #define DO_ALTBLTIN 0x20 /* %builtin in alt. path */
7067 static void find_command(char *, struct cmdentry *, int, const char *);
7070 /* ============ Hashing commands */
7073 * When commands are first encountered, they are entered in a hash table.
7074 * This ensures that a full path search will not have to be done for them
7075 * on each invocation.
7077 * We should investigate converting to a linear search, even though that
7078 * would make the command name "hash" a misnomer.
7082 struct tblentry *next; /* next entry in hash chain */
7083 union param param; /* definition of builtin function */
7084 smallint cmdtype; /* CMDxxx */
7085 char rehash; /* if set, cd done since entry created */
7086 char cmdname[1]; /* name of command */
7089 static struct tblentry **cmdtable;
7090 #define INIT_G_cmdtable() do { \
7091 cmdtable = xzalloc(CMDTABLESIZE * sizeof(cmdtable[0])); \
7094 static int builtinloc = -1; /* index in path of %builtin, or -1 */
7098 tryexec(IF_FEATURE_SH_STANDALONE(int applet_no,) char *cmd, char **argv, char **envp)
7102 #if ENABLE_FEATURE_SH_STANDALONE
7103 if (applet_no >= 0) {
7104 if (APPLET_IS_NOEXEC(applet_no)) {
7107 run_applet_no_and_exit(applet_no, argv);
7109 /* re-exec ourselves with the new arguments */
7110 execve(bb_busybox_exec_path, argv, envp);
7111 /* If they called chroot or otherwise made the binary no longer
7112 * executable, fall through */
7119 execve(cmd, argv, envp);
7120 } while (errno == EINTR);
7122 execve(cmd, argv, envp);
7128 if (errno == ENOEXEC) {
7132 for (ap = argv; *ap; ap++)
7134 ap = new = ckmalloc((ap - argv + 2) * sizeof(ap[0]));
7136 ap[0] = cmd = (char *)DEFAULT_SHELL;
7139 while ((*ap++ = *argv++) != NULL)
7148 * Exec a program. Never returns. If you change this routine, you may
7149 * have to change the find_command routine as well.
7151 static void shellexec(char **, const char *, int) NORETURN;
7153 shellexec(char **argv, const char *path, int idx)
7159 #if ENABLE_FEATURE_SH_STANDALONE
7163 clearredir(/*drop:*/ 1);
7164 envp = listvars(VEXPORT, VUNSET, 0);
7165 if (strchr(argv[0], '/') != NULL
7166 #if ENABLE_FEATURE_SH_STANDALONE
7167 || (applet_no = find_applet_by_name(argv[0])) >= 0
7170 tryexec(IF_FEATURE_SH_STANDALONE(applet_no,) argv[0], argv, envp);
7174 while ((cmdname = path_advance(&path, argv[0])) != NULL) {
7175 if (--idx < 0 && pathopt == NULL) {
7176 tryexec(IF_FEATURE_SH_STANDALONE(-1,) cmdname, argv, envp);
7177 if (errno != ENOENT && errno != ENOTDIR)
7184 /* Map to POSIX errors */
7196 exitstatus = exerrno;
7197 TRACE(("shellexec failed for %s, errno %d, suppressint %d\n",
7198 argv[0], e, suppressint));
7199 ash_msg_and_raise(EXEXEC, "%s: %s", argv[0], errmsg(e, "not found"));
7204 printentry(struct tblentry *cmdp)
7210 idx = cmdp->param.index;
7213 name = path_advance(&path, cmdp->cmdname);
7215 } while (--idx >= 0);
7216 out1fmt("%s%s\n", name, (cmdp->rehash ? "*" : nullstr));
7220 * Clear out command entries. The argument specifies the first entry in
7221 * PATH which has changed.
7224 clearcmdentry(int firstchange)
7226 struct tblentry **tblp;
7227 struct tblentry **pp;
7228 struct tblentry *cmdp;
7231 for (tblp = cmdtable; tblp < &cmdtable[CMDTABLESIZE]; tblp++) {
7233 while ((cmdp = *pp) != NULL) {
7234 if ((cmdp->cmdtype == CMDNORMAL &&
7235 cmdp->param.index >= firstchange)
7236 || (cmdp->cmdtype == CMDBUILTIN &&
7237 builtinloc >= firstchange)
7250 * Locate a command in the command hash table. If "add" is nonzero,
7251 * add the command to the table if it is not already present. The
7252 * variable "lastcmdentry" is set to point to the address of the link
7253 * pointing to the entry, so that delete_cmd_entry can delete the
7256 * Interrupts must be off if called with add != 0.
7258 static struct tblentry **lastcmdentry;
7260 static struct tblentry *
7261 cmdlookup(const char *name, int add)
7263 unsigned int hashval;
7265 struct tblentry *cmdp;
7266 struct tblentry **pp;
7269 hashval = (unsigned char)*p << 4;
7271 hashval += (unsigned char)*p++;
7273 pp = &cmdtable[hashval % CMDTABLESIZE];
7274 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7275 if (strcmp(cmdp->cmdname, name) == 0)
7279 if (add && cmdp == NULL) {
7280 cmdp = *pp = ckzalloc(sizeof(struct tblentry)
7282 /* + 1 - already done because
7283 * tblentry::cmdname is char[1] */);
7284 /*cmdp->next = NULL; - ckzalloc did it */
7285 cmdp->cmdtype = CMDUNKNOWN;
7286 strcpy(cmdp->cmdname, name);
7293 * Delete the command entry returned on the last lookup.
7296 delete_cmd_entry(void)
7298 struct tblentry *cmdp;
7301 cmdp = *lastcmdentry;
7302 *lastcmdentry = cmdp->next;
7303 if (cmdp->cmdtype == CMDFUNCTION)
7304 freefunc(cmdp->param.func);
7310 * Add a new command entry, replacing any existing command entry for
7311 * the same name - except special builtins.
7314 addcmdentry(char *name, struct cmdentry *entry)
7316 struct tblentry *cmdp;
7318 cmdp = cmdlookup(name, 1);
7319 if (cmdp->cmdtype == CMDFUNCTION) {
7320 freefunc(cmdp->param.func);
7322 cmdp->cmdtype = entry->cmdtype;
7323 cmdp->param = entry->u;
7327 static int FAST_FUNC
7328 hashcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
7330 struct tblentry **pp;
7331 struct tblentry *cmdp;
7333 struct cmdentry entry;
7336 if (nextopt("r") != '\0') {
7341 if (*argptr == NULL) {
7342 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
7343 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7344 if (cmdp->cmdtype == CMDNORMAL)
7352 while ((name = *argptr) != NULL) {
7353 cmdp = cmdlookup(name, 0);
7355 && (cmdp->cmdtype == CMDNORMAL
7356 || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))
7360 find_command(name, &entry, DO_ERR, pathval());
7361 if (entry.cmdtype == CMDUNKNOWN)
7369 * Called when a cd is done. Marks all commands so the next time they
7370 * are executed they will be rehashed.
7375 struct tblentry **pp;
7376 struct tblentry *cmdp;
7378 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
7379 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7380 if (cmdp->cmdtype == CMDNORMAL
7381 || (cmdp->cmdtype == CMDBUILTIN
7382 && !IS_BUILTIN_REGULAR(cmdp->param.cmd)
7392 * Fix command hash table when PATH changed.
7393 * Called before PATH is changed. The argument is the new value of PATH;
7394 * pathval() still returns the old value at this point.
7395 * Called with interrupts off.
7397 static void FAST_FUNC
7398 changepath(const char *new)
7406 firstchange = 9999; /* assume no change */
7412 if ((*old == '\0' && *new == ':')
7413 || (*old == ':' && *new == '\0'))
7415 old = new; /* ignore subsequent differences */
7419 if (*new == '%' && idx_bltin < 0 && prefix(new + 1, "builtin"))
7425 if (builtinloc < 0 && idx_bltin >= 0)
7426 builtinloc = idx_bltin; /* zap builtins */
7427 if (builtinloc >= 0 && idx_bltin < 0)
7429 clearcmdentry(firstchange);
7430 builtinloc = idx_bltin;
7445 #define TENDBQUOTE 12
7462 typedef smallint token_id_t;
7464 /* first char is indicating which tokens mark the end of a list */
7465 static const char *const tokname_array[] = {
7479 #define KWDOFFSET 13
7480 /* the following are keywords */
7502 static char buf[16];
7505 //if (tok < TSEMI) return tokname_array[tok] + 1;
7506 //sprintf(buf, "\"%s\"", tokname_array[tok] + 1);
7511 sprintf(buf + (tok >= TSEMI), "%s%c",
7512 tokname_array[tok] + 1, (tok >= TSEMI ? '"' : 0));
7516 /* Wrapper around strcmp for qsort/bsearch/... */
7518 pstrcmp(const void *a, const void *b)
7520 return strcmp((char*) a, (*(char**) b) + 1);
7523 static const char *const *
7524 findkwd(const char *s)
7526 return bsearch(s, tokname_array + KWDOFFSET,
7527 ARRAY_SIZE(tokname_array) - KWDOFFSET,
7528 sizeof(tokname_array[0]), pstrcmp);
7532 * Locate and print what a word is...
7535 describe_command(char *command, int describe_command_verbose)
7537 struct cmdentry entry;
7538 struct tblentry *cmdp;
7539 #if ENABLE_ASH_ALIAS
7540 const struct alias *ap;
7542 const char *path = pathval();
7544 if (describe_command_verbose) {
7548 /* First look at the keywords */
7549 if (findkwd(command)) {
7550 out1str(describe_command_verbose ? " is a shell keyword" : command);
7554 #if ENABLE_ASH_ALIAS
7555 /* Then look at the aliases */
7556 ap = lookupalias(command, 0);
7558 if (!describe_command_verbose) {
7563 out1fmt(" is an alias for %s", ap->val);
7567 /* Then check if it is a tracked alias */
7568 cmdp = cmdlookup(command, 0);
7570 entry.cmdtype = cmdp->cmdtype;
7571 entry.u = cmdp->param;
7573 /* Finally use brute force */
7574 find_command(command, &entry, DO_ABS, path);
7577 switch (entry.cmdtype) {
7579 int j = entry.u.index;
7585 p = path_advance(&path, command);
7589 if (describe_command_verbose) {
7591 (cmdp ? " a tracked alias for" : nullstr), p
7600 if (describe_command_verbose) {
7601 out1str(" is a shell function");
7608 if (describe_command_verbose) {
7609 out1fmt(" is a %sshell builtin",
7610 IS_BUILTIN_SPECIAL(entry.u.cmd) ?
7611 "special " : nullstr
7619 if (describe_command_verbose) {
7620 out1str(": not found\n");
7625 outstr("\n", stdout);
7629 static int FAST_FUNC
7630 typecmd(int argc UNUSED_PARAM, char **argv)
7636 /* type -p ... ? (we don't bother checking for 'p') */
7637 if (argv[1] && argv[1][0] == '-') {
7642 err |= describe_command(argv[i++], verbose);
7647 #if ENABLE_ASH_CMDCMD
7648 static int FAST_FUNC
7649 commandcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
7657 while ((c = nextopt("pvV")) != '\0')
7659 verify |= VERIFY_VERBOSE;
7661 verify |= VERIFY_BRIEF;
7666 /* Mimic bash: just "command -v" doesn't complain, it's a nop */
7667 if (verify && (*argptr != NULL)) {
7668 return describe_command(*argptr, verify - VERIFY_BRIEF);
7676 /* ============ eval.c */
7678 static int funcblocksize; /* size of structures in function */
7679 static int funcstringsize; /* size of strings in node */
7680 static void *funcblock; /* block to allocate function from */
7681 static char *funcstring; /* block to allocate strings from */
7683 /* flags in argument to evaltree */
7684 #define EV_EXIT 01 /* exit after evaluating tree */
7685 #define EV_TESTED 02 /* exit status is checked; ignore -e flag */
7686 #define EV_BACKCMD 04 /* command executing within back quotes */
7688 static const short nodesize[N_NUMBER] = {
7689 [NCMD ] = SHELL_ALIGN(sizeof(struct ncmd)),
7690 [NPIPE ] = SHELL_ALIGN(sizeof(struct npipe)),
7691 [NREDIR ] = SHELL_ALIGN(sizeof(struct nredir)),
7692 [NBACKGND ] = SHELL_ALIGN(sizeof(struct nredir)),
7693 [NSUBSHELL] = SHELL_ALIGN(sizeof(struct nredir)),
7694 [NAND ] = SHELL_ALIGN(sizeof(struct nbinary)),
7695 [NOR ] = SHELL_ALIGN(sizeof(struct nbinary)),
7696 [NSEMI ] = SHELL_ALIGN(sizeof(struct nbinary)),
7697 [NIF ] = SHELL_ALIGN(sizeof(struct nif)),
7698 [NWHILE ] = SHELL_ALIGN(sizeof(struct nbinary)),
7699 [NUNTIL ] = SHELL_ALIGN(sizeof(struct nbinary)),
7700 [NFOR ] = SHELL_ALIGN(sizeof(struct nfor)),
7701 [NCASE ] = SHELL_ALIGN(sizeof(struct ncase)),
7702 [NCLIST ] = SHELL_ALIGN(sizeof(struct nclist)),
7703 [NDEFUN ] = SHELL_ALIGN(sizeof(struct narg)),
7704 [NARG ] = SHELL_ALIGN(sizeof(struct narg)),
7705 [NTO ] = SHELL_ALIGN(sizeof(struct nfile)),
7706 #if ENABLE_ASH_BASH_COMPAT
7707 [NTO2 ] = SHELL_ALIGN(sizeof(struct nfile)),
7709 [NCLOBBER ] = SHELL_ALIGN(sizeof(struct nfile)),
7710 [NFROM ] = SHELL_ALIGN(sizeof(struct nfile)),
7711 [NFROMTO ] = SHELL_ALIGN(sizeof(struct nfile)),
7712 [NAPPEND ] = SHELL_ALIGN(sizeof(struct nfile)),
7713 [NTOFD ] = SHELL_ALIGN(sizeof(struct ndup)),
7714 [NFROMFD ] = SHELL_ALIGN(sizeof(struct ndup)),
7715 [NHERE ] = SHELL_ALIGN(sizeof(struct nhere)),
7716 [NXHERE ] = SHELL_ALIGN(sizeof(struct nhere)),
7717 [NNOT ] = SHELL_ALIGN(sizeof(struct nnot)),
7720 static void calcsize(union node *n);
7723 sizenodelist(struct nodelist *lp)
7726 funcblocksize += SHELL_ALIGN(sizeof(struct nodelist));
7733 calcsize(union node *n)
7737 funcblocksize += nodesize[n->type];
7740 calcsize(n->ncmd.redirect);
7741 calcsize(n->ncmd.args);
7742 calcsize(n->ncmd.assign);
7745 sizenodelist(n->npipe.cmdlist);
7750 calcsize(n->nredir.redirect);
7751 calcsize(n->nredir.n);
7758 calcsize(n->nbinary.ch2);
7759 calcsize(n->nbinary.ch1);
7762 calcsize(n->nif.elsepart);
7763 calcsize(n->nif.ifpart);
7764 calcsize(n->nif.test);
7767 funcstringsize += strlen(n->nfor.var) + 1;
7768 calcsize(n->nfor.body);
7769 calcsize(n->nfor.args);
7772 calcsize(n->ncase.cases);
7773 calcsize(n->ncase.expr);
7776 calcsize(n->nclist.body);
7777 calcsize(n->nclist.pattern);
7778 calcsize(n->nclist.next);
7782 sizenodelist(n->narg.backquote);
7783 funcstringsize += strlen(n->narg.text) + 1;
7784 calcsize(n->narg.next);
7787 #if ENABLE_ASH_BASH_COMPAT
7794 calcsize(n->nfile.fname);
7795 calcsize(n->nfile.next);
7799 calcsize(n->ndup.vname);
7800 calcsize(n->ndup.next);
7804 calcsize(n->nhere.doc);
7805 calcsize(n->nhere.next);
7808 calcsize(n->nnot.com);
7814 nodeckstrdup(char *s)
7816 char *rtn = funcstring;
7818 strcpy(funcstring, s);
7819 funcstring += strlen(s) + 1;
7823 static union node *copynode(union node *);
7825 static struct nodelist *
7826 copynodelist(struct nodelist *lp)
7828 struct nodelist *start;
7829 struct nodelist **lpp;
7834 funcblock = (char *) funcblock + SHELL_ALIGN(sizeof(struct nodelist));
7835 (*lpp)->n = copynode(lp->n);
7837 lpp = &(*lpp)->next;
7844 copynode(union node *n)
7851 funcblock = (char *) funcblock + nodesize[n->type];
7855 new->ncmd.redirect = copynode(n->ncmd.redirect);
7856 new->ncmd.args = copynode(n->ncmd.args);
7857 new->ncmd.assign = copynode(n->ncmd.assign);
7860 new->npipe.cmdlist = copynodelist(n->npipe.cmdlist);
7861 new->npipe.pipe_backgnd = n->npipe.pipe_backgnd;
7866 new->nredir.redirect = copynode(n->nredir.redirect);
7867 new->nredir.n = copynode(n->nredir.n);
7874 new->nbinary.ch2 = copynode(n->nbinary.ch2);
7875 new->nbinary.ch1 = copynode(n->nbinary.ch1);
7878 new->nif.elsepart = copynode(n->nif.elsepart);
7879 new->nif.ifpart = copynode(n->nif.ifpart);
7880 new->nif.test = copynode(n->nif.test);
7883 new->nfor.var = nodeckstrdup(n->nfor.var);
7884 new->nfor.body = copynode(n->nfor.body);
7885 new->nfor.args = copynode(n->nfor.args);
7888 new->ncase.cases = copynode(n->ncase.cases);
7889 new->ncase.expr = copynode(n->ncase.expr);
7892 new->nclist.body = copynode(n->nclist.body);
7893 new->nclist.pattern = copynode(n->nclist.pattern);
7894 new->nclist.next = copynode(n->nclist.next);
7898 new->narg.backquote = copynodelist(n->narg.backquote);
7899 new->narg.text = nodeckstrdup(n->narg.text);
7900 new->narg.next = copynode(n->narg.next);
7903 #if ENABLE_ASH_BASH_COMPAT
7910 new->nfile.fname = copynode(n->nfile.fname);
7911 new->nfile.fd = n->nfile.fd;
7912 new->nfile.next = copynode(n->nfile.next);
7916 new->ndup.vname = copynode(n->ndup.vname);
7917 new->ndup.dupfd = n->ndup.dupfd;
7918 new->ndup.fd = n->ndup.fd;
7919 new->ndup.next = copynode(n->ndup.next);
7923 new->nhere.doc = copynode(n->nhere.doc);
7924 new->nhere.fd = n->nhere.fd;
7925 new->nhere.next = copynode(n->nhere.next);
7928 new->nnot.com = copynode(n->nnot.com);
7931 new->type = n->type;
7936 * Make a copy of a parse tree.
7938 static struct funcnode *
7939 copyfunc(union node *n)
7944 funcblocksize = offsetof(struct funcnode, n);
7947 blocksize = funcblocksize;
7948 f = ckmalloc(blocksize + funcstringsize);
7949 funcblock = (char *) f + offsetof(struct funcnode, n);
7950 funcstring = (char *) f + blocksize;
7957 * Define a shell function.
7960 defun(char *name, union node *func)
7962 struct cmdentry entry;
7965 entry.cmdtype = CMDFUNCTION;
7966 entry.u.func = copyfunc(func);
7967 addcmdentry(name, &entry);
7971 /* Reasons for skipping commands (see comment on breakcmd routine) */
7972 #define SKIPBREAK (1 << 0)
7973 #define SKIPCONT (1 << 1)
7974 #define SKIPFUNC (1 << 2)
7975 #define SKIPFILE (1 << 3)
7976 #define SKIPEVAL (1 << 4)
7977 static smallint evalskip; /* set to SKIPxxx if we are skipping commands */
7978 static int skipcount; /* number of levels to skip */
7979 static int funcnest; /* depth of function calls */
7980 static int loopnest; /* current loop nesting level */
7982 /* Forward decl way out to parsing code - dotrap needs it */
7983 static int evalstring(char *s, int mask);
7985 /* Called to execute a trap.
7986 * Single callsite - at the end of evaltree().
7987 * If we return non-zero, exaltree raises EXEXIT exception.
7989 * Perhaps we should avoid entering new trap handlers
7990 * while we are executing a trap handler. [is it a TODO?]
7999 savestatus = exitstatus;
8003 TRACE(("dotrap entered\n"));
8004 for (sig = 1, g = gotsig; sig < NSIG; sig++, g++) {
8011 /* non-trapped SIGINT is handled separately by raise_interrupt,
8012 * don't upset it by resetting gotsig[SIGINT-1] */
8013 if (sig == SIGINT && !t)
8016 TRACE(("sig %d is active, will run handler '%s'\n", sig, t));
8020 want_exexit = evalstring(t, SKIPEVAL);
8021 exitstatus = savestatus;
8023 TRACE(("dotrap returns %d\n", want_exexit));
8028 TRACE(("dotrap returns 0\n"));
8032 /* forward declarations - evaluation is fairly recursive business... */
8033 static void evalloop(union node *, int);
8034 static void evalfor(union node *, int);
8035 static void evalcase(union node *, int);
8036 static void evalsubshell(union node *, int);
8037 static void expredir(union node *);
8038 static void evalpipe(union node *, int);
8039 static void evalcommand(union node *, int);
8040 static int evalbltin(const struct builtincmd *, int, char **);
8041 static void prehash(union node *);
8044 * Evaluate a parse tree. The value is left in the global variable
8048 evaltree(union node *n, int flags)
8050 struct jmploc *volatile savehandler = exception_handler;
8051 struct jmploc jmploc;
8053 void (*evalfn)(union node *, int);
8057 SAVE_INT(int_level);
8060 TRACE(("evaltree(NULL) called\n"));
8063 TRACE(("evaltree(%p: %d, %d) called\n", n, n->type, flags));
8065 exception_handler = &jmploc;
8067 int err = setjmp(jmploc.loc);
8069 /* if it was a signal, check for trap handlers */
8070 if (exception_type == EXSIG) {
8071 TRACE(("exception %d (EXSIG) in evaltree, err=%d\n",
8072 exception_type, err));
8075 /* continue on the way out */
8076 TRACE(("exception %d in evaltree, propagating err=%d\n",
8077 exception_type, err));
8078 exception_handler = savehandler;
8079 longjmp(exception_handler->loc, err);
8086 out1fmt("Node type = %d\n", n->type);
8091 evaltree(n->nnot.com, EV_TESTED);
8092 status = !exitstatus;
8095 expredir(n->nredir.redirect);
8096 status = redirectsafe(n->nredir.redirect, REDIR_PUSH);
8098 evaltree(n->nredir.n, flags & EV_TESTED);
8099 status = exitstatus;
8101 popredir(/*drop:*/ 0, /*restore:*/ 0 /* not sure */);
8104 evalfn = evalcommand;
8106 if (eflag && !(flags & EV_TESTED))
8118 evalfn = evalsubshell;
8131 #error NAND + 1 != NOR
8133 #if NOR + 1 != NSEMI
8134 #error NOR + 1 != NSEMI
8136 unsigned is_or = n->type - NAND;
8139 (flags | ((is_or >> 1) - 1)) & EV_TESTED
8141 if (!exitstatus == is_or)
8154 evaltree(n->nif.test, EV_TESTED);
8157 if (exitstatus == 0) {
8161 if (n->nif.elsepart) {
8162 n = n->nif.elsepart;
8167 defun(n->narg.text, n->narg.next);
8171 exitstatus = status;
8176 exception_handler = savehandler;
8178 if (checkexit & exitstatus)
8179 evalskip |= SKIPEVAL;
8180 else if (pendingsig && dotrap())
8183 if (flags & EV_EXIT) {
8185 raise_exception(EXEXIT);
8188 RESTORE_INT(int_level);
8189 TRACE(("leaving evaltree (no interrupts)\n"));
8192 #if !defined(__alpha__) || (defined(__GNUC__) && __GNUC__ >= 3)
8195 void evaltreenr(union node *, int) __attribute__ ((alias("evaltree"),__noreturn__));
8198 evalloop(union node *n, int flags)
8208 evaltree(n->nbinary.ch1, EV_TESTED);
8211 if (evalskip == SKIPCONT && --skipcount <= 0) {
8215 if (evalskip == SKIPBREAK && --skipcount <= 0)
8220 if (n->type != NWHILE)
8224 evaltree(n->nbinary.ch2, flags);
8225 status = exitstatus;
8230 exitstatus = status;
8234 evalfor(union node *n, int flags)
8236 struct arglist arglist;
8239 struct stackmark smark;
8241 setstackmark(&smark);
8242 arglist.list = NULL;
8243 arglist.lastp = &arglist.list;
8244 for (argp = n->nfor.args; argp; argp = argp->narg.next) {
8245 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE | EXP_RECORD);
8250 *arglist.lastp = NULL;
8255 for (sp = arglist.list; sp; sp = sp->next) {
8256 setvar(n->nfor.var, sp->text, 0);
8257 evaltree(n->nfor.body, flags);
8259 if (evalskip == SKIPCONT && --skipcount <= 0) {
8263 if (evalskip == SKIPBREAK && --skipcount <= 0)
8270 popstackmark(&smark);
8274 evalcase(union node *n, int flags)
8278 struct arglist arglist;
8279 struct stackmark smark;
8281 setstackmark(&smark);
8282 arglist.list = NULL;
8283 arglist.lastp = &arglist.list;
8284 expandarg(n->ncase.expr, &arglist, EXP_TILDE);
8286 for (cp = n->ncase.cases; cp && evalskip == 0; cp = cp->nclist.next) {
8287 for (patp = cp->nclist.pattern; patp; patp = patp->narg.next) {
8288 if (casematch(patp, arglist.list->text)) {
8289 if (evalskip == 0) {
8290 evaltree(cp->nclist.body, flags);
8297 popstackmark(&smark);
8301 * Kick off a subshell to evaluate a tree.
8304 evalsubshell(union node *n, int flags)
8307 int backgnd = (n->type == NBACKGND);
8310 expredir(n->nredir.redirect);
8311 if (!backgnd && flags & EV_EXIT && !trap[0])
8314 jp = makejob(/*n,*/ 1);
8315 if (forkshell(jp, n, backgnd) == 0) {
8319 flags &=~ EV_TESTED;
8321 redirect(n->nredir.redirect, 0);
8322 evaltreenr(n->nredir.n, flags);
8327 status = waitforjob(jp);
8328 exitstatus = status;
8333 * Compute the names of the files in a redirection list.
8335 static void fixredir(union node *, const char *, int);
8337 expredir(union node *n)
8341 for (redir = n; redir; redir = redir->nfile.next) {
8345 fn.lastp = &fn.list;
8346 switch (redir->type) {
8350 #if ENABLE_ASH_BASH_COMPAT
8355 expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR);
8356 #if ENABLE_ASH_BASH_COMPAT
8359 redir->nfile.expfname = fn.list->text;
8362 case NTOFD: /* >& */
8363 if (redir->ndup.vname) {
8364 expandarg(redir->ndup.vname, &fn, EXP_FULL | EXP_TILDE);
8365 if (fn.list == NULL)
8366 ash_msg_and_raise_error("redir error");
8367 #if ENABLE_ASH_BASH_COMPAT
8368 //FIXME: we used expandarg with different args!
8369 if (!isdigit_str9(fn.list->text)) {
8370 /* >&file, not >&fd */
8371 if (redir->nfile.fd != 1) /* 123>&file - BAD */
8372 ash_msg_and_raise_error("redir error");
8374 goto store_expfname;
8377 fixredir(redir, fn.list->text, 1);
8385 * Evaluate a pipeline. All the processes in the pipeline are children
8386 * of the process creating the pipeline. (This differs from some versions
8387 * of the shell, which make the last process in a pipeline the parent
8391 evalpipe(union node *n, int flags)
8394 struct nodelist *lp;
8399 TRACE(("evalpipe(0x%lx) called\n", (long)n));
8401 for (lp = n->npipe.cmdlist; lp; lp = lp->next)
8405 jp = makejob(/*n,*/ pipelen);
8407 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
8411 if (pipe(pip) < 0) {
8413 ash_msg_and_raise_error("pipe call failed");
8416 if (forkshell(jp, lp->n, n->npipe.pipe_backgnd) == 0) {
8429 evaltreenr(lp->n, flags);
8435 /* Don't want to trigger debugging */
8439 if (n->npipe.pipe_backgnd == 0) {
8440 exitstatus = waitforjob(jp);
8441 TRACE(("evalpipe: job done exit status %d\n", exitstatus));
8447 * Controls whether the shell is interactive or not.
8450 setinteractive(int on)
8452 static smallint is_interactive;
8454 if (++on == is_interactive)
8456 is_interactive = on;
8460 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
8461 if (is_interactive > 1) {
8462 /* Looks like they want an interactive shell */
8463 static smallint did_banner;
8468 "%s built-in shell (ash)\n"
8469 "Enter 'help' for a list of built-in commands."
8484 setinteractive(iflag);
8486 #if ENABLE_FEATURE_EDITING_VI
8488 line_input_state->flags |= VI_MODE;
8490 line_input_state->flags &= ~VI_MODE;
8492 viflag = 0; /* forcibly keep the option off */
8496 static struct localvar *localvars;
8499 * Called after a function returns.
8500 * Interrupts must be off.
8505 struct localvar *lvp;
8508 while ((lvp = localvars) != NULL) {
8509 localvars = lvp->next;
8511 TRACE(("poplocalvar %s\n", vp ? vp->text : "-"));
8512 if (vp == NULL) { /* $- saved */
8513 memcpy(optlist, lvp->text, sizeof(optlist));
8514 free((char*)lvp->text);
8516 } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) {
8520 (*vp->func)(strchrnul(lvp->text, '=') + 1);
8521 if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
8522 free((char*)vp->text);
8523 vp->flags = lvp->flags;
8524 vp->text = lvp->text;
8531 evalfun(struct funcnode *func, int argc, char **argv, int flags)
8533 volatile struct shparam saveparam;
8534 struct localvar *volatile savelocalvars;
8535 struct jmploc *volatile savehandler;
8536 struct jmploc jmploc;
8539 saveparam = shellparam;
8540 savelocalvars = localvars;
8541 e = setjmp(jmploc.loc);
8546 savehandler = exception_handler;
8547 exception_handler = &jmploc;
8549 shellparam.malloced = 0;
8553 shellparam.nparam = argc - 1;
8554 shellparam.p = argv + 1;
8555 #if ENABLE_ASH_GETOPTS
8556 shellparam.optind = 1;
8557 shellparam.optoff = -1;
8559 evaltree(&func->n, flags & EV_TESTED);
8565 localvars = savelocalvars;
8566 freeparam(&shellparam);
8567 shellparam = saveparam;
8568 exception_handler = savehandler;
8570 evalskip &= ~SKIPFUNC;
8574 #if ENABLE_ASH_CMDCMD
8576 parse_command_args(char **argv, const char **path)
8589 if (c == '-' && !*cp) {
8596 *path = bb_default_path;
8599 /* run 'typecmd' for other options */
8610 * Make a variable a local variable. When a variable is made local, it's
8611 * value and flags are saved in a localvar structure. The saved values
8612 * will be restored when the shell function returns. We handle the name
8613 * "-" as a special case.
8618 struct localvar *lvp;
8623 lvp = ckzalloc(sizeof(struct localvar));
8624 if (LONE_DASH(name)) {
8626 p = ckmalloc(sizeof(optlist));
8627 lvp->text = memcpy(p, optlist, sizeof(optlist));
8632 vpp = hashvar(name);
8633 vp = *findvar(vpp, name);
8634 eq = strchr(name, '=');
8637 setvareq(name, VSTRFIXED);
8639 setvar(name, NULL, VSTRFIXED);
8640 vp = *vpp; /* the new variable */
8641 lvp->flags = VUNSET;
8643 lvp->text = vp->text;
8644 lvp->flags = vp->flags;
8645 vp->flags |= VSTRFIXED|VTEXTFIXED;
8651 lvp->next = localvars;
8657 * The "local" command.
8659 static int FAST_FUNC
8660 localcmd(int argc UNUSED_PARAM, char **argv)
8665 while ((name = *argv++) != NULL) {
8671 static int FAST_FUNC
8672 falsecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
8677 static int FAST_FUNC
8678 truecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
8683 static int FAST_FUNC
8684 execcmd(int argc UNUSED_PARAM, char **argv)
8687 iflag = 0; /* exit on error */
8690 shellexec(argv + 1, pathval(), 0);
8696 * The return command.
8698 static int FAST_FUNC
8699 returncmd(int argc UNUSED_PARAM, char **argv)
8702 * If called outside a function, do what ksh does;
8703 * skip the rest of the file.
8705 evalskip = funcnest ? SKIPFUNC : SKIPFILE;
8706 return argv[1] ? number(argv[1]) : exitstatus;
8709 /* Forward declarations for builtintab[] */
8710 static int breakcmd(int, char **) FAST_FUNC;
8711 static int dotcmd(int, char **) FAST_FUNC;
8712 static int evalcmd(int, char **) FAST_FUNC;
8713 static int exitcmd(int, char **) FAST_FUNC;
8714 static int exportcmd(int, char **) FAST_FUNC;
8715 #if ENABLE_ASH_GETOPTS
8716 static int getoptscmd(int, char **) FAST_FUNC;
8718 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
8719 static int helpcmd(int, char **) FAST_FUNC;
8721 #if ENABLE_SH_MATH_SUPPORT
8722 static int letcmd(int, char **) FAST_FUNC;
8724 static int readcmd(int, char **) FAST_FUNC;
8725 static int setcmd(int, char **) FAST_FUNC;
8726 static int shiftcmd(int, char **) FAST_FUNC;
8727 static int timescmd(int, char **) FAST_FUNC;
8728 static int trapcmd(int, char **) FAST_FUNC;
8729 static int umaskcmd(int, char **) FAST_FUNC;
8730 static int unsetcmd(int, char **) FAST_FUNC;
8731 static int ulimitcmd(int, char **) FAST_FUNC;
8733 #define BUILTIN_NOSPEC "0"
8734 #define BUILTIN_SPECIAL "1"
8735 #define BUILTIN_REGULAR "2"
8736 #define BUILTIN_SPEC_REG "3"
8737 #define BUILTIN_ASSIGN "4"
8738 #define BUILTIN_SPEC_ASSG "5"
8739 #define BUILTIN_REG_ASSG "6"
8740 #define BUILTIN_SPEC_REG_ASSG "7"
8742 /* Stubs for calling non-FAST_FUNC's */
8743 #if ENABLE_ASH_BUILTIN_ECHO
8744 static int FAST_FUNC echocmd(int argc, char **argv) { return echo_main(argc, argv); }
8746 #if ENABLE_ASH_BUILTIN_PRINTF
8747 static int FAST_FUNC printfcmd(int argc, char **argv) { return printf_main(argc, argv); }
8749 #if ENABLE_ASH_BUILTIN_TEST
8750 static int FAST_FUNC testcmd(int argc, char **argv) { return test_main(argc, argv); }
8753 /* Keep these in proper order since it is searched via bsearch() */
8754 static const struct builtincmd builtintab[] = {
8755 { BUILTIN_SPEC_REG ".", dotcmd },
8756 { BUILTIN_SPEC_REG ":", truecmd },
8757 #if ENABLE_ASH_BUILTIN_TEST
8758 { BUILTIN_REGULAR "[", testcmd },
8759 #if ENABLE_ASH_BASH_COMPAT
8760 { BUILTIN_REGULAR "[[", testcmd },
8763 #if ENABLE_ASH_ALIAS
8764 { BUILTIN_REG_ASSG "alias", aliascmd },
8767 { BUILTIN_REGULAR "bg", fg_bgcmd },
8769 { BUILTIN_SPEC_REG "break", breakcmd },
8770 { BUILTIN_REGULAR "cd", cdcmd },
8771 { BUILTIN_NOSPEC "chdir", cdcmd },
8772 #if ENABLE_ASH_CMDCMD
8773 { BUILTIN_REGULAR "command", commandcmd },
8775 { BUILTIN_SPEC_REG "continue", breakcmd },
8776 #if ENABLE_ASH_BUILTIN_ECHO
8777 { BUILTIN_REGULAR "echo", echocmd },
8779 { BUILTIN_SPEC_REG "eval", evalcmd },
8780 { BUILTIN_SPEC_REG "exec", execcmd },
8781 { BUILTIN_SPEC_REG "exit", exitcmd },
8782 { BUILTIN_SPEC_REG_ASSG "export", exportcmd },
8783 { BUILTIN_REGULAR "false", falsecmd },
8785 { BUILTIN_REGULAR "fg", fg_bgcmd },
8787 #if ENABLE_ASH_GETOPTS
8788 { BUILTIN_REGULAR "getopts", getoptscmd },
8790 { BUILTIN_NOSPEC "hash", hashcmd },
8791 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
8792 { BUILTIN_NOSPEC "help", helpcmd },
8795 { BUILTIN_REGULAR "jobs", jobscmd },
8796 { BUILTIN_REGULAR "kill", killcmd },
8798 #if ENABLE_SH_MATH_SUPPORT
8799 { BUILTIN_NOSPEC "let", letcmd },
8801 { BUILTIN_ASSIGN "local", localcmd },
8802 #if ENABLE_ASH_BUILTIN_PRINTF
8803 { BUILTIN_REGULAR "printf", printfcmd },
8805 { BUILTIN_NOSPEC "pwd", pwdcmd },
8806 { BUILTIN_REGULAR "read", readcmd },
8807 { BUILTIN_SPEC_REG_ASSG "readonly", exportcmd },
8808 { BUILTIN_SPEC_REG "return", returncmd },
8809 { BUILTIN_SPEC_REG "set", setcmd },
8810 { BUILTIN_SPEC_REG "shift", shiftcmd },
8811 { BUILTIN_SPEC_REG "source", dotcmd },
8812 #if ENABLE_ASH_BUILTIN_TEST
8813 { BUILTIN_REGULAR "test", testcmd },
8815 { BUILTIN_SPEC_REG "times", timescmd },
8816 { BUILTIN_SPEC_REG "trap", trapcmd },
8817 { BUILTIN_REGULAR "true", truecmd },
8818 { BUILTIN_NOSPEC "type", typecmd },
8819 { BUILTIN_NOSPEC "ulimit", ulimitcmd },
8820 { BUILTIN_REGULAR "umask", umaskcmd },
8821 #if ENABLE_ASH_ALIAS
8822 { BUILTIN_REGULAR "unalias", unaliascmd },
8824 { BUILTIN_SPEC_REG "unset", unsetcmd },
8825 { BUILTIN_REGULAR "wait", waitcmd },
8828 /* Should match the above table! */
8829 #define COMMANDCMD (builtintab + \
8831 1 * ENABLE_ASH_BUILTIN_TEST + \
8832 1 * ENABLE_ASH_BUILTIN_TEST * ENABLE_ASH_BASH_COMPAT + \
8833 1 * ENABLE_ASH_ALIAS + \
8834 1 * ENABLE_ASH_JOB_CONTROL + \
8836 #define EXECCMD (builtintab + \
8838 1 * ENABLE_ASH_BUILTIN_TEST + \
8839 1 * ENABLE_ASH_BUILTIN_TEST * ENABLE_ASH_BASH_COMPAT + \
8840 1 * ENABLE_ASH_ALIAS + \
8841 1 * ENABLE_ASH_JOB_CONTROL + \
8843 1 * ENABLE_ASH_CMDCMD + \
8845 ENABLE_ASH_BUILTIN_ECHO + \
8849 * Search the table of builtin commands.
8851 static struct builtincmd *
8852 find_builtin(const char *name)
8854 struct builtincmd *bp;
8857 name, builtintab, ARRAY_SIZE(builtintab), sizeof(builtintab[0]),
8864 * Execute a simple command.
8867 isassignment(const char *p)
8869 const char *q = endofname(p);
8874 static int FAST_FUNC
8875 bltincmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
8877 /* Preserve exitstatus of a previous possible redirection
8878 * as POSIX mandates */
8879 return back_exitstatus;
8882 evalcommand(union node *cmd, int flags)
8884 static const struct builtincmd null_bltin = {
8885 "\0\0", bltincmd /* why three NULs? */
8887 struct stackmark smark;
8889 struct arglist arglist;
8890 struct arglist varlist;
8893 const struct strlist *sp;
8894 struct cmdentry cmdentry;
8901 struct builtincmd *bcmd;
8902 smallint cmd_is_exec;
8903 smallint pseudovarflag = 0;
8905 /* First expand the arguments. */
8906 TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags));
8907 setstackmark(&smark);
8908 back_exitstatus = 0;
8910 cmdentry.cmdtype = CMDBUILTIN;
8911 cmdentry.u.cmd = &null_bltin;
8912 varlist.lastp = &varlist.list;
8913 *varlist.lastp = NULL;
8914 arglist.lastp = &arglist.list;
8915 *arglist.lastp = NULL;
8918 if (cmd->ncmd.args) {
8919 bcmd = find_builtin(cmd->ncmd.args->narg.text);
8920 pseudovarflag = bcmd && IS_BUILTIN_ASSIGN(bcmd);
8923 for (argp = cmd->ncmd.args; argp; argp = argp->narg.next) {
8924 struct strlist **spp;
8926 spp = arglist.lastp;
8927 if (pseudovarflag && isassignment(argp->narg.text))
8928 expandarg(argp, &arglist, EXP_VARTILDE);
8930 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
8932 for (sp = *spp; sp; sp = sp->next)
8936 argv = nargv = stalloc(sizeof(char *) * (argc + 1));
8937 for (sp = arglist.list; sp; sp = sp->next) {
8938 TRACE(("evalcommand arg: %s\n", sp->text));
8939 *nargv++ = sp->text;
8944 if (iflag && funcnest == 0 && argc > 0)
8945 lastarg = nargv[-1];
8948 expredir(cmd->ncmd.redirect);
8949 status = redirectsafe(cmd->ncmd.redirect, REDIR_PUSH | REDIR_SAVEFD2);
8952 for (argp = cmd->ncmd.assign; argp; argp = argp->narg.next) {
8953 struct strlist **spp;
8956 spp = varlist.lastp;
8957 expandarg(argp, &varlist, EXP_VARTILDE);
8960 * Modify the command lookup path, if a PATH= assignment
8964 if (varequal(p, path))
8968 /* Print the command if xflag is set. */
8971 const char *p = " %s";
8974 fdprintf(preverrout_fd, p, expandstr(ps4val()));
8977 for (n = 0; n < 2; n++) {
8979 fdprintf(preverrout_fd, p, sp->text);
8987 safe_write(preverrout_fd, "\n", 1);
8993 /* Now locate the command. */
8995 const char *oldpath;
8996 int cmd_flag = DO_ERR;
9001 find_command(argv[0], &cmdentry, cmd_flag, path);
9002 if (cmdentry.cmdtype == CMDUNKNOWN) {
9008 /* implement bltin and command here */
9009 if (cmdentry.cmdtype != CMDBUILTIN)
9012 spclbltin = IS_BUILTIN_SPECIAL(cmdentry.u.cmd);
9013 if (cmdentry.u.cmd == EXECCMD)
9015 #if ENABLE_ASH_CMDCMD
9016 if (cmdentry.u.cmd == COMMANDCMD) {
9018 nargv = parse_command_args(argv, &path);
9021 argc -= nargv - argv;
9023 cmd_flag |= DO_NOFUNC;
9031 /* We have a redirection error. */
9033 raise_exception(EXERROR);
9035 exitstatus = status;
9039 /* Execute the command. */
9040 switch (cmdentry.cmdtype) {
9043 #if ENABLE_FEATURE_SH_NOFORK
9044 /* Hmmm... shouldn't it happen somewhere in forkshell() instead?
9045 * Why "fork off a child process if necessary" doesn't apply to NOFORK? */
9047 /* find_command() encodes applet_no as (-2 - applet_no) */
9048 int applet_no = (- cmdentry.u.index - 2);
9049 if (applet_no >= 0 && APPLET_IS_NOFORK(applet_no)) {
9050 listsetvar(varlist.list, VEXPORT|VSTACK);
9051 /* run <applet>_main() */
9052 exitstatus = run_nofork_applet(applet_no, argv);
9057 /* Fork off a child process if necessary. */
9058 if (!(flags & EV_EXIT) || trap[0]) {
9060 jp = makejob(/*cmd,*/ 1);
9061 if (forkshell(jp, cmd, FORK_FG) != 0) {
9062 exitstatus = waitforjob(jp);
9064 TRACE(("forked child exited with %d\n", exitstatus));
9069 listsetvar(varlist.list, VEXPORT|VSTACK);
9070 shellexec(argv, path, cmdentry.u.index);
9074 cmdenviron = varlist.list;
9076 struct strlist *list = cmdenviron;
9078 if (spclbltin > 0 || argc == 0) {
9080 if (cmd_is_exec && argc > 1)
9083 listsetvar(list, i);
9085 /* Tight loop with builtins only:
9086 * "while kill -0 $child; do true; done"
9087 * will never exit even if $child died, unless we do this
9088 * to reap the zombie and make kill detect that it's gone: */
9089 dowait(DOWAIT_NONBLOCK, NULL);
9091 if (evalbltin(cmdentry.u.cmd, argc, argv)) {
9093 int i = exception_type;
9098 exit_status = 128 + SIGINT;
9100 exit_status = 128 + pendingsig;
9101 exitstatus = exit_status;
9102 if (i == EXINT || spclbltin > 0) {
9104 longjmp(exception_handler->loc, 1);
9111 listsetvar(varlist.list, 0);
9112 /* See above for the rationale */
9113 dowait(DOWAIT_NONBLOCK, NULL);
9114 if (evalfun(cmdentry.u.func, argc, argv, flags))
9120 popredir(/*drop:*/ cmd_is_exec, /*restore:*/ cmd_is_exec);
9122 /* dsl: I think this is intended to be used to support
9123 * '_' in 'vi' command mode during line editing...
9124 * However I implemented that within libedit itself.
9126 setvar("_", lastarg, 0);
9128 popstackmark(&smark);
9132 evalbltin(const struct builtincmd *cmd, int argc, char **argv)
9134 char *volatile savecmdname;
9135 struct jmploc *volatile savehandler;
9136 struct jmploc jmploc;
9139 savecmdname = commandname;
9140 i = setjmp(jmploc.loc);
9143 savehandler = exception_handler;
9144 exception_handler = &jmploc;
9145 commandname = argv[0];
9147 optptr = NULL; /* initialize nextopt */
9148 exitstatus = (*cmd->builtin)(argc, argv);
9149 flush_stdout_stderr();
9151 exitstatus |= ferror(stdout);
9153 commandname = savecmdname;
9155 exception_handler = savehandler;
9161 goodname(const char *p)
9163 return !*endofname(p);
9168 * Search for a command. This is called before we fork so that the
9169 * location of the command will be available in the parent as well as
9170 * the child. The check for "goodname" is an overly conservative
9171 * check that the name will not be subject to expansion.
9174 prehash(union node *n)
9176 struct cmdentry entry;
9178 if (n->type == NCMD && n->ncmd.args && goodname(n->ncmd.args->narg.text))
9179 find_command(n->ncmd.args->narg.text, &entry, 0, pathval());
9183 /* ============ Builtin commands
9185 * Builtin commands whose functions are closely tied to evaluation
9186 * are implemented here.
9190 * Handle break and continue commands. Break, continue, and return are
9191 * all handled by setting the evalskip flag. The evaluation routines
9192 * above all check this flag, and if it is set they start skipping
9193 * commands rather than executing them. The variable skipcount is
9194 * the number of loops to break/continue, or the number of function
9195 * levels to return. (The latter is always 1.) It should probably
9196 * be an error to break out of more loops than exist, but it isn't
9197 * in the standard shell so we don't make it one here.
9199 static int FAST_FUNC
9200 breakcmd(int argc UNUSED_PARAM, char **argv)
9202 int n = argv[1] ? number(argv[1]) : 1;
9205 ash_msg_and_raise_error(illnum, argv[1]);
9209 evalskip = (**argv == 'c') ? SKIPCONT : SKIPBREAK;
9216 /* ============ input.c
9218 * This implements the input routines used by the parser.
9222 INPUT_PUSH_FILE = 1,
9223 INPUT_NOFILE_OK = 2,
9226 static smallint checkkwd;
9227 /* values of checkkwd variable */
9228 #define CHKALIAS 0x1
9233 * Push a string back onto the input at this current parsefile level.
9234 * We handle aliases this way.
9236 #if !ENABLE_ASH_ALIAS
9237 #define pushstring(s, ap) pushstring(s)
9240 pushstring(char *s, struct alias *ap)
9247 if (g_parsefile->strpush) {
9248 sp = ckzalloc(sizeof(*sp));
9249 sp->prev = g_parsefile->strpush;
9251 sp = &(g_parsefile->basestrpush);
9253 g_parsefile->strpush = sp;
9254 sp->prev_string = g_parsefile->next_to_pgetc;
9255 sp->prev_left_in_line = g_parsefile->left_in_line;
9256 #if ENABLE_ASH_ALIAS
9259 ap->flag |= ALIASINUSE;
9263 g_parsefile->next_to_pgetc = s;
9264 g_parsefile->left_in_line = len;
9271 struct strpush *sp = g_parsefile->strpush;
9274 #if ENABLE_ASH_ALIAS
9276 if (g_parsefile->next_to_pgetc[-1] == ' '
9277 || g_parsefile->next_to_pgetc[-1] == '\t'
9279 checkkwd |= CHKALIAS;
9281 if (sp->string != sp->ap->val) {
9284 sp->ap->flag &= ~ALIASINUSE;
9285 if (sp->ap->flag & ALIASDEAD) {
9286 unalias(sp->ap->name);
9290 g_parsefile->next_to_pgetc = sp->prev_string;
9291 g_parsefile->left_in_line = sp->prev_left_in_line;
9292 g_parsefile->strpush = sp->prev;
9293 if (sp != &(g_parsefile->basestrpush))
9298 //FIXME: BASH_COMPAT with "...&" does TWO pungetc():
9299 //it peeks whether it is &>, and then pushes back both chars.
9300 //This function needs to save last *next_to_pgetc to buf[0]
9301 //to make two pungetc() reliable. Currently,
9302 // pgetc (out of buf: does preadfd), pgetc, pungetc, pungetc won't work...
9307 char *buf = g_parsefile->buf;
9309 g_parsefile->next_to_pgetc = buf;
9310 #if ENABLE_FEATURE_EDITING
9312 if (!iflag || g_parsefile->fd != STDIN_FILENO)
9313 nr = nonblock_safe_read(g_parsefile->fd, buf, BUFSIZ - 1);
9315 #if ENABLE_FEATURE_TAB_COMPLETION
9316 line_input_state->path_lookup = pathval();
9318 nr = read_line_input(cmdedit_prompt, buf, BUFSIZ, line_input_state);
9320 /* Ctrl+C pressed */
9329 if (nr < 0 && errno == 0) {
9330 /* Ctrl+D pressed */
9335 nr = nonblock_safe_read(g_parsefile->fd, buf, BUFSIZ - 1);
9339 /* nonblock_safe_read() handles this problem */
9341 if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
9342 int flags = fcntl(0, F_GETFL);
9343 if (flags >= 0 && (flags & O_NONBLOCK)) {
9344 flags &= ~O_NONBLOCK;
9345 if (fcntl(0, F_SETFL, flags) >= 0) {
9346 out2str("sh: turning off NDELAY mode\n");
9357 * Refill the input buffer and return the next input character:
9359 * 1) If a string was pushed back on the input, pop it;
9360 * 2) If an EOF was pushed back (g_parsefile->left_in_line < -BIGNUM)
9361 * or we are reading from a string so we can't refill the buffer,
9363 * 3) If there is more stuff in this buffer, use it else call read to fill it.
9364 * 4) Process input up to the next newline, deleting nul characters.
9366 //#define pgetc_debug(...) bb_error_msg(__VA_ARGS__)
9367 #define pgetc_debug(...) ((void)0)
9369 * NB: due to SIT(c) internals (syntax_index_table[] vector),
9370 * pgetc() and related functions must return chars SIGN-EXTENDED into ints,
9371 * not zero-extended. Seems fragile to me. Affects only !USE_SIT_FUNCTION case,
9372 * so we can fix it by ditching !USE_SIT_FUNCTION if Unicode requires that.
9380 while (g_parsefile->strpush) {
9381 #if ENABLE_ASH_ALIAS
9382 if (g_parsefile->left_in_line == -1
9383 && g_parsefile->strpush->ap
9384 && g_parsefile->next_to_pgetc[-1] != ' '
9385 && g_parsefile->next_to_pgetc[-1] != '\t'
9387 pgetc_debug("preadbuffer PEOA");
9392 /* try "pgetc" now: */
9393 pgetc_debug("preadbuffer internal pgetc at %d:%p'%s'",
9394 g_parsefile->left_in_line,
9395 g_parsefile->next_to_pgetc,
9396 g_parsefile->next_to_pgetc);
9397 if (--g_parsefile->left_in_line >= 0)
9398 return (unsigned char)(*g_parsefile->next_to_pgetc++);
9400 /* on both branches above g_parsefile->left_in_line < 0.
9401 * "pgetc" needs refilling.
9404 /* -90 is our -BIGNUM. Below we use -99 to mark "EOF on read",
9405 * pungetc() may increment it a few times.
9406 * Assuming it won't increment it to less than -90.
9408 if (g_parsefile->left_in_line < -90 || g_parsefile->buf == NULL) {
9409 pgetc_debug("preadbuffer PEOF1");
9410 /* even in failure keep left_in_line and next_to_pgetc
9411 * in lock step, for correct multi-layer pungetc.
9412 * left_in_line was decremented before preadbuffer(),
9413 * must inc next_to_pgetc: */
9414 g_parsefile->next_to_pgetc++;
9418 more = g_parsefile->left_in_buffer;
9420 flush_stdout_stderr();
9424 /* don't try reading again */
9425 g_parsefile->left_in_line = -99;
9426 pgetc_debug("preadbuffer PEOF2");
9427 g_parsefile->next_to_pgetc++;
9432 /* Find out where's the end of line.
9433 * Set g_parsefile->left_in_line
9434 * and g_parsefile->left_in_buffer acordingly.
9435 * NUL chars are deleted.
9437 q = g_parsefile->next_to_pgetc;
9445 memmove(q, q + 1, more);
9449 g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1;
9455 g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1;
9456 if (g_parsefile->left_in_line < 0)
9461 g_parsefile->left_in_buffer = more;
9466 out2str(g_parsefile->next_to_pgetc);
9470 pgetc_debug("preadbuffer at %d:%p'%s'",
9471 g_parsefile->left_in_line,
9472 g_parsefile->next_to_pgetc,
9473 g_parsefile->next_to_pgetc);
9474 return signed_char2int(*g_parsefile->next_to_pgetc++);
9477 #define pgetc_as_macro() \
9478 (--g_parsefile->left_in_line >= 0 \
9479 ? signed_char2int(*g_parsefile->next_to_pgetc++) \
9486 pgetc_debug("pgetc_fast at %d:%p'%s'",
9487 g_parsefile->left_in_line,
9488 g_parsefile->next_to_pgetc,
9489 g_parsefile->next_to_pgetc);
9490 return pgetc_as_macro();
9493 #if ENABLE_ASH_OPTIMIZE_FOR_SIZE
9494 #define pgetc_fast() pgetc()
9496 #define pgetc_fast() pgetc_as_macro()
9500 * Same as pgetc(), but ignores PEOA.
9502 #if ENABLE_ASH_ALIAS
9508 pgetc_debug("pgetc_fast at %d:%p'%s'",
9509 g_parsefile->left_in_line,
9510 g_parsefile->next_to_pgetc,
9511 g_parsefile->next_to_pgetc);
9513 } while (c == PEOA);
9517 #define pgetc2() pgetc()
9521 * Read a line from the script.
9524 pfgets(char *line, int len)
9530 while (--nleft > 0) {
9546 * Undo the last call to pgetc. Only one character may be pushed back.
9547 * PEOF may be pushed back.
9552 g_parsefile->left_in_line++;
9553 g_parsefile->next_to_pgetc--;
9554 pgetc_debug("pushed back to %d:%p'%s'",
9555 g_parsefile->left_in_line,
9556 g_parsefile->next_to_pgetc,
9557 g_parsefile->next_to_pgetc);
9561 * To handle the "." command, a stack of input files is used. Pushfile
9562 * adds a new entry to the stack and popfile restores the previous level.
9567 struct parsefile *pf;
9569 pf = ckzalloc(sizeof(*pf));
9570 pf->prev = g_parsefile;
9572 /*pf->strpush = NULL; - ckzalloc did it */
9573 /*pf->basestrpush.prev = NULL;*/
9580 struct parsefile *pf = g_parsefile;
9588 g_parsefile = pf->prev;
9594 * Return to top level.
9599 while (g_parsefile != &basepf)
9604 * Close the file(s) that the shell is reading commands from. Called
9605 * after a fork is done.
9611 if (g_parsefile->fd > 0) {
9612 close(g_parsefile->fd);
9613 g_parsefile->fd = 0;
9618 * Like setinputfile, but takes an open file descriptor. Call this with
9622 setinputfd(int fd, int push)
9624 close_on_exec_on(fd);
9627 g_parsefile->buf = NULL;
9629 g_parsefile->fd = fd;
9630 if (g_parsefile->buf == NULL)
9631 g_parsefile->buf = ckmalloc(IBUFSIZ);
9632 g_parsefile->left_in_buffer = 0;
9633 g_parsefile->left_in_line = 0;
9634 g_parsefile->linno = 1;
9638 * Set the input to take input from a file. If push is set, push the
9639 * old input onto the stack first.
9642 setinputfile(const char *fname, int flags)
9648 fd = open(fname, O_RDONLY);
9650 if (flags & INPUT_NOFILE_OK)
9652 ash_msg_and_raise_error("can't open '%s'", fname);
9655 fd2 = copyfd(fd, 10);
9658 ash_msg_and_raise_error("out of file descriptors");
9661 setinputfd(fd, flags & INPUT_PUSH_FILE);
9668 * Like setinputfile, but takes input from a string.
9671 setinputstring(char *string)
9675 g_parsefile->next_to_pgetc = string;
9676 g_parsefile->left_in_line = strlen(string);
9677 g_parsefile->buf = NULL;
9678 g_parsefile->linno = 1;
9683 /* ============ mail.c
9685 * Routines to check for mail.
9690 #define MAXMBOXES 10
9692 /* times of mailboxes */
9693 static time_t mailtime[MAXMBOXES];
9694 /* Set if MAIL or MAILPATH is changed. */
9695 static smallint mail_var_path_changed;
9698 * Print appropriate message(s) if mail has arrived.
9699 * If mail_var_path_changed is set,
9700 * then the value of MAIL has mail_var_path_changed,
9701 * so we just update the values.
9710 struct stackmark smark;
9713 setstackmark(&smark);
9714 mpath = mpathset() ? mpathval() : mailval();
9715 for (mtp = mailtime; mtp < mailtime + MAXMBOXES; mtp++) {
9716 p = path_advance(&mpath, nullstr);
9721 for (q = p; *q; q++)
9727 q[-1] = '\0'; /* delete trailing '/' */
9728 if (stat(p, &statb) < 0) {
9732 if (!mail_var_path_changed && statb.st_mtime != *mtp) {
9735 pathopt ? pathopt : "you have mail"
9738 *mtp = statb.st_mtime;
9740 mail_var_path_changed = 0;
9741 popstackmark(&smark);
9744 static void FAST_FUNC
9745 changemail(const char *val UNUSED_PARAM)
9747 mail_var_path_changed = 1;
9750 #endif /* ASH_MAIL */
9753 /* ============ ??? */
9756 * Set the shell parameters.
9759 setparam(char **argv)
9765 for (nparam = 0; argv[nparam]; nparam++)
9767 ap = newparam = ckmalloc((nparam + 1) * sizeof(*ap));
9769 *ap++ = ckstrdup(*argv++);
9772 freeparam(&shellparam);
9773 shellparam.malloced = 1;
9774 shellparam.nparam = nparam;
9775 shellparam.p = newparam;
9776 #if ENABLE_ASH_GETOPTS
9777 shellparam.optind = 1;
9778 shellparam.optoff = -1;
9783 * Process shell options. The global variable argptr contains a pointer
9784 * to the argument list; we advance it past the options.
9786 * SUSv3 section 2.8.1 "Consequences of Shell Errors" says:
9787 * For a non-interactive shell, an error condition encountered
9788 * by a special built-in ... shall cause the shell to write a diagnostic message
9789 * to standard error and exit as shown in the following table:
9790 * Error Special Built-In
9792 * Utility syntax error (option or operand error) Shall exit
9794 * However, in bug 1142 (http://busybox.net/bugs/view.php?id=1142)
9795 * we see that bash does not do that (set "finishes" with error code 1 instead,
9796 * and shell continues), and people rely on this behavior!
9798 * set -o barfoo 2>/dev/null
9801 * Oh well. Let's mimic that.
9804 plus_minus_o(char *name, int val)
9809 for (i = 0; i < NOPTS; i++) {
9810 if (strcmp(name, optnames(i)) == 0) {
9815 ash_msg("illegal option %co %s", val ? '-' : '+', name);
9818 for (i = 0; i < NOPTS; i++) {
9820 out1fmt("%-16s%s\n", optnames(i), optlist[i] ? "on" : "off");
9822 out1fmt("set %co %s\n", optlist[i] ? '-' : '+', optnames(i));
9828 setoption(int flag, int val)
9832 for (i = 0; i < NOPTS; i++) {
9833 if (optletters(i) == flag) {
9838 ash_msg_and_raise_error("illegal option %c%c", val ? '-' : '+', flag);
9842 options(int cmdline)
9850 while ((p = *argptr) != NULL) {
9852 if (c != '-' && c != '+')
9855 val = 0; /* val = 0 if c == '+' */
9858 if (p[0] == '\0' || LONE_DASH(p)) {
9860 /* "-" means turn off -x and -v */
9863 /* "--" means reset params */
9864 else if (*argptr == NULL)
9867 break; /* "-" or "--" terminates options */
9870 /* first char was + or - */
9871 while ((c = *p++) != '\0') {
9872 /* bash 3.2 indeed handles -c CMD and +c CMD the same */
9873 if (c == 'c' && cmdline) {
9874 minusc = p; /* command is after shell args */
9875 } else if (c == 'o') {
9876 if (plus_minus_o(*argptr, val)) {
9877 /* it already printed err message */
9878 return 1; /* error */
9882 } else if (cmdline && (c == 'l')) { /* -l or +l == --login */
9884 /* bash does not accept +-login, we also won't */
9885 } else if (cmdline && val && (c == '-')) { /* long options */
9886 if (strcmp(p, "login") == 0)
9898 * The shift builtin command.
9900 static int FAST_FUNC
9901 shiftcmd(int argc UNUSED_PARAM, char **argv)
9908 n = number(argv[1]);
9909 if (n > shellparam.nparam)
9910 n = 0; /* bash compat, was = shellparam.nparam; */
9912 shellparam.nparam -= n;
9913 for (ap1 = shellparam.p; --n >= 0; ap1++) {
9914 if (shellparam.malloced)
9918 while ((*ap2++ = *ap1++) != NULL)
9920 #if ENABLE_ASH_GETOPTS
9921 shellparam.optind = 1;
9922 shellparam.optoff = -1;
9929 * POSIX requires that 'set' (but not export or readonly) output the
9930 * variables in lexicographic order - by the locale's collating order (sigh).
9931 * Maybe we could keep them in an ordered balanced binary tree
9932 * instead of hashed lists.
9933 * For now just roll 'em through qsort for printing...
9936 showvars(const char *sep_prefix, int on, int off)
9941 ep = listvars(on, off, &epend);
9942 qsort(ep, epend - ep, sizeof(char *), vpcmp);
9944 sep = *sep_prefix ? " " : sep_prefix;
9946 for (; ep < epend; ep++) {
9950 p = strchrnul(*ep, '=');
9953 q = single_quote(++p);
9954 out1fmt("%s%s%.*s%s\n", sep_prefix, sep, (int)(p - *ep), *ep, q);
9960 * The set command builtin.
9962 static int FAST_FUNC
9963 setcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
9968 return showvars(nullstr, 0, VUNSET);
9971 if (!options(0)) { /* if no parse error... */
9974 if (*argptr != NULL) {
9982 #if ENABLE_ASH_RANDOM_SUPPORT
9983 static void FAST_FUNC
9984 change_random(const char *value)
9986 /* Galois LFSR parameter */
9987 /* Taps at 32 31 29 1: */
9988 enum { MASK = 0x8000000b };
9989 /* Another example - taps at 32 31 30 10: */
9990 /* MASK = 0x00400007 */
9992 if (value == NULL) {
9993 /* "get", generate */
9996 /* LCG has period of 2^32 and alternating lowest bit */
9997 random_LCG = 1664525 * random_LCG + 1013904223;
9998 /* Galois LFSR has period of 2^32-1 = 3 * 5 * 17 * 257 * 65537 */
9999 t = (random_galois_LFSR << 1);
10000 if (random_galois_LFSR < 0) /* if we just shifted 1 out of msb... */
10002 random_galois_LFSR = t;
10003 /* Both are weak, combining them gives better randomness
10004 * and ~2^64 period. & 0x7fff is probably bash compat
10005 * for $RANDOM range. Combining with subtraction is
10006 * just for fun. + and ^ would work equally well. */
10007 t = (t - random_LCG) & 0x7fff;
10008 /* set without recursion */
10009 setvar(vrandom.text, utoa(t), VNOFUNC);
10010 vrandom.flags &= ~VNOFUNC;
10013 random_galois_LFSR = random_LCG = strtoul(value, (char **)NULL, 10);
10018 #if ENABLE_ASH_GETOPTS
10020 getopts(char *optstr, char *optvar, char **optfirst, int *param_optind, int *optoff)
10029 if (*param_optind < 1)
10031 optnext = optfirst + *param_optind - 1;
10033 if (*param_optind <= 1 || *optoff < 0 || (int)strlen(optnext[-1]) < *optoff)
10036 p = optnext[-1] + *optoff;
10037 if (p == NULL || *p == '\0') {
10038 /* Current word is done, advance */
10040 if (p == NULL || *p != '-' || *++p == '\0') {
10047 if (LONE_DASH(p)) /* check for "--" */
10052 for (q = optstr; *q != c;) {
10054 if (optstr[0] == ':') {
10057 err |= setvarsafe("OPTARG", s, 0);
10059 fprintf(stderr, "Illegal option -%c\n", c);
10060 unsetvar("OPTARG");
10070 if (*p == '\0' && (p = *optnext) == NULL) {
10071 if (optstr[0] == ':') {
10074 err |= setvarsafe("OPTARG", s, 0);
10077 fprintf(stderr, "No arg for -%c option\n", c);
10078 unsetvar("OPTARG");
10086 err |= setvarsafe("OPTARG", p, 0);
10089 err |= setvarsafe("OPTARG", nullstr, 0);
10091 *optoff = p ? p - *(optnext - 1) : -1;
10092 *param_optind = optnext - optfirst + 1;
10093 fmtstr(s, sizeof(s), "%d", *param_optind);
10094 err |= setvarsafe("OPTIND", s, VNOFUNC);
10097 err |= setvarsafe(optvar, s, 0);
10101 flush_stdout_stderr();
10102 raise_exception(EXERROR);
10108 * The getopts builtin. Shellparam.optnext points to the next argument
10109 * to be processed. Shellparam.optptr points to the next character to
10110 * be processed in the current argument. If shellparam.optnext is NULL,
10111 * then it's the first time getopts has been called.
10113 static int FAST_FUNC
10114 getoptscmd(int argc, char **argv)
10119 ash_msg_and_raise_error("usage: getopts optstring var [arg]");
10121 optbase = shellparam.p;
10122 if (shellparam.optind > shellparam.nparam + 1) {
10123 shellparam.optind = 1;
10124 shellparam.optoff = -1;
10127 optbase = &argv[3];
10128 if (shellparam.optind > argc - 2) {
10129 shellparam.optind = 1;
10130 shellparam.optoff = -1;
10134 return getopts(argv[1], argv[2], optbase, &shellparam.optind,
10135 &shellparam.optoff);
10137 #endif /* ASH_GETOPTS */
10140 /* ============ Shell parser */
10143 struct heredoc *next; /* next here document in list */
10144 union node *here; /* redirection node */
10145 char *eofmark; /* string indicating end of input */
10146 smallint striptabs; /* if set, strip leading tabs */
10149 static smallint tokpushback; /* last token pushed back */
10150 static smallint parsebackquote; /* nonzero if we are inside backquotes */
10151 static smallint quoteflag; /* set if (part of) last token was quoted */
10152 static token_id_t lasttoken; /* last token read (integer id Txxx) */
10153 static struct heredoc *heredoclist; /* list of here documents to read */
10154 static char *wordtext; /* text of last word returned by readtoken */
10155 static struct nodelist *backquotelist;
10156 static union node *redirnode;
10157 static struct heredoc *heredoc;
10160 * Called when an unexpected token is read during the parse. The argument
10161 * is the token that is expected, or -1 if more than one type of token can
10162 * occur at this point.
10164 static void raise_error_unexpected_syntax(int) NORETURN;
10166 raise_error_unexpected_syntax(int token)
10171 l = sprintf(msg, "unexpected %s", tokname(lasttoken));
10173 sprintf(msg + l, " (expecting %s)", tokname(token));
10174 raise_error_syntax(msg);
10178 #define EOFMARKLEN 79
10180 /* parsing is heavily cross-recursive, need these forward decls */
10181 static union node *andor(void);
10182 static union node *pipeline(void);
10183 static union node *parse_command(void);
10184 static void parseheredoc(void);
10185 static char peektoken(void);
10186 static int readtoken(void);
10188 static union node *
10191 union node *n1, *n2, *n3;
10194 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10195 if (nlflag == 2 && peektoken())
10201 if (tok == TBACKGND) {
10202 if (n2->type == NPIPE) {
10203 n2->npipe.pipe_backgnd = 1;
10205 if (n2->type != NREDIR) {
10206 n3 = stzalloc(sizeof(struct nredir));
10208 /*n3->nredir.redirect = NULL; - stzalloc did it */
10211 n2->type = NBACKGND;
10217 n3 = stzalloc(sizeof(struct nbinary));
10219 n3->nbinary.ch1 = n1;
10220 n3->nbinary.ch2 = n2;
10236 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10244 pungetc(); /* push back EOF on input */
10248 raise_error_unexpected_syntax(-1);
10255 static union node *
10258 union node *n1, *n2, *n3;
10266 } else if (t == TOR) {
10272 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10274 n3 = stzalloc(sizeof(struct nbinary));
10276 n3->nbinary.ch1 = n1;
10277 n3->nbinary.ch2 = n2;
10282 static union node *
10285 union node *n1, *n2, *pipenode;
10286 struct nodelist *lp, *prev;
10290 TRACE(("pipeline: entered\n"));
10291 if (readtoken() == TNOT) {
10293 checkkwd = CHKKWD | CHKALIAS;
10296 n1 = parse_command();
10297 if (readtoken() == TPIPE) {
10298 pipenode = stzalloc(sizeof(struct npipe));
10299 pipenode->type = NPIPE;
10300 /*pipenode->npipe.pipe_backgnd = 0; - stzalloc did it */
10301 lp = stzalloc(sizeof(struct nodelist));
10302 pipenode->npipe.cmdlist = lp;
10306 lp = stzalloc(sizeof(struct nodelist));
10307 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10308 lp->n = parse_command();
10310 } while (readtoken() == TPIPE);
10316 n2 = stzalloc(sizeof(struct nnot));
10324 static union node *
10329 n = stzalloc(sizeof(struct narg));
10331 /*n->narg.next = NULL; - stzalloc did it */
10332 n->narg.text = wordtext;
10333 n->narg.backquote = backquotelist;
10338 fixredir(union node *n, const char *text, int err)
10342 TRACE(("Fix redir %s %d\n", text, err));
10344 n->ndup.vname = NULL;
10346 fd = bb_strtou(text, NULL, 10);
10347 if (!errno && fd >= 0)
10348 n->ndup.dupfd = fd;
10349 else if (LONE_DASH(text))
10350 n->ndup.dupfd = -1;
10353 raise_error_syntax("bad fd number");
10354 n->ndup.vname = makename();
10359 * Returns true if the text contains nothing to expand (no dollar signs
10363 noexpand(const char *text)
10369 while ((c = *p++) != '\0') {
10370 if (c == CTLQUOTEMARK)
10374 else if (SIT((signed char)c, BASESYNTAX) == CCTL)
10383 union node *n = redirnode;
10385 if (readtoken() != TWORD)
10386 raise_error_unexpected_syntax(-1);
10387 if (n->type == NHERE) {
10388 struct heredoc *here = heredoc;
10392 if (quoteflag == 0)
10394 TRACE(("Here document %d\n", n->type));
10395 if (!noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN)
10396 raise_error_syntax("illegal eof marker for << redirection");
10397 rmescapes(wordtext);
10398 here->eofmark = wordtext;
10400 if (heredoclist == NULL)
10401 heredoclist = here;
10403 for (p = heredoclist; p->next; p = p->next)
10407 } else if (n->type == NTOFD || n->type == NFROMFD) {
10408 fixredir(n, wordtext, 0);
10410 n->nfile.fname = makename();
10414 static union node *
10417 union node *args, **app;
10418 union node *n = NULL;
10419 union node *vars, **vpp;
10420 union node **rpp, *redir;
10422 #if ENABLE_ASH_BASH_COMPAT
10423 smallint double_brackets_flag = 0;
10433 savecheckkwd = CHKALIAS;
10436 checkkwd = savecheckkwd;
10439 #if ENABLE_ASH_BASH_COMPAT
10440 case TAND: /* "&&" */
10441 case TOR: /* "||" */
10442 if (!double_brackets_flag) {
10446 wordtext = (char *) (t == TAND ? "-a" : "-o");
10449 n = stzalloc(sizeof(struct narg));
10451 /*n->narg.next = NULL; - stzalloc did it */
10452 n->narg.text = wordtext;
10453 #if ENABLE_ASH_BASH_COMPAT
10454 if (strcmp("[[", wordtext) == 0)
10455 double_brackets_flag = 1;
10456 else if (strcmp("]]", wordtext) == 0)
10457 double_brackets_flag = 0;
10459 n->narg.backquote = backquotelist;
10460 if (savecheckkwd && isassignment(wordtext)) {
10462 vpp = &n->narg.next;
10465 app = &n->narg.next;
10470 *rpp = n = redirnode;
10471 rpp = &n->nfile.next;
10472 parsefname(); /* read name of redirection file */
10475 if (args && app == &args->narg.next
10478 struct builtincmd *bcmd;
10481 /* We have a function */
10482 if (readtoken() != TRP)
10483 raise_error_unexpected_syntax(TRP);
10484 name = n->narg.text;
10485 if (!goodname(name)
10486 || ((bcmd = find_builtin(name)) && IS_BUILTIN_SPECIAL(bcmd))
10488 raise_error_syntax("bad function name");
10491 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10492 n->narg.next = parse_command();
10505 n = stzalloc(sizeof(struct ncmd));
10507 n->ncmd.args = args;
10508 n->ncmd.assign = vars;
10509 n->ncmd.redirect = redir;
10513 static union node *
10514 parse_command(void)
10516 union node *n1, *n2;
10517 union node *ap, **app;
10518 union node *cp, **cpp;
10519 union node *redir, **rpp;
10526 switch (readtoken()) {
10528 raise_error_unexpected_syntax(-1);
10531 n1 = stzalloc(sizeof(struct nif));
10533 n1->nif.test = list(0);
10534 if (readtoken() != TTHEN)
10535 raise_error_unexpected_syntax(TTHEN);
10536 n1->nif.ifpart = list(0);
10538 while (readtoken() == TELIF) {
10539 n2->nif.elsepart = stzalloc(sizeof(struct nif));
10540 n2 = n2->nif.elsepart;
10542 n2->nif.test = list(0);
10543 if (readtoken() != TTHEN)
10544 raise_error_unexpected_syntax(TTHEN);
10545 n2->nif.ifpart = list(0);
10547 if (lasttoken == TELSE)
10548 n2->nif.elsepart = list(0);
10550 n2->nif.elsepart = NULL;
10558 n1 = stzalloc(sizeof(struct nbinary));
10559 n1->type = (lasttoken == TWHILE) ? NWHILE : NUNTIL;
10560 n1->nbinary.ch1 = list(0);
10563 TRACE(("expecting DO got %s %s\n", tokname(got),
10564 got == TWORD ? wordtext : ""));
10565 raise_error_unexpected_syntax(TDO);
10567 n1->nbinary.ch2 = list(0);
10572 if (readtoken() != TWORD || quoteflag || !goodname(wordtext))
10573 raise_error_syntax("bad for loop variable");
10574 n1 = stzalloc(sizeof(struct nfor));
10576 n1->nfor.var = wordtext;
10577 checkkwd = CHKKWD | CHKALIAS;
10578 if (readtoken() == TIN) {
10580 while (readtoken() == TWORD) {
10581 n2 = stzalloc(sizeof(struct narg));
10583 /*n2->narg.next = NULL; - stzalloc did it */
10584 n2->narg.text = wordtext;
10585 n2->narg.backquote = backquotelist;
10587 app = &n2->narg.next;
10590 n1->nfor.args = ap;
10591 if (lasttoken != TNL && lasttoken != TSEMI)
10592 raise_error_unexpected_syntax(-1);
10594 n2 = stzalloc(sizeof(struct narg));
10596 /*n2->narg.next = NULL; - stzalloc did it */
10597 n2->narg.text = (char *)dolatstr;
10598 /*n2->narg.backquote = NULL;*/
10599 n1->nfor.args = n2;
10601 * Newline or semicolon here is optional (but note
10602 * that the original Bourne shell only allowed NL).
10604 if (lasttoken != TNL && lasttoken != TSEMI)
10607 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10608 if (readtoken() != TDO)
10609 raise_error_unexpected_syntax(TDO);
10610 n1->nfor.body = list(0);
10614 n1 = stzalloc(sizeof(struct ncase));
10616 if (readtoken() != TWORD)
10617 raise_error_unexpected_syntax(TWORD);
10618 n1->ncase.expr = n2 = stzalloc(sizeof(struct narg));
10620 /*n2->narg.next = NULL; - stzalloc did it */
10621 n2->narg.text = wordtext;
10622 n2->narg.backquote = backquotelist;
10624 checkkwd = CHKKWD | CHKALIAS;
10625 } while (readtoken() == TNL);
10626 if (lasttoken != TIN)
10627 raise_error_unexpected_syntax(TIN);
10628 cpp = &n1->ncase.cases;
10630 checkkwd = CHKNL | CHKKWD;
10632 while (t != TESAC) {
10633 if (lasttoken == TLP)
10635 *cpp = cp = stzalloc(sizeof(struct nclist));
10637 app = &cp->nclist.pattern;
10639 *app = ap = stzalloc(sizeof(struct narg));
10641 /*ap->narg.next = NULL; - stzalloc did it */
10642 ap->narg.text = wordtext;
10643 ap->narg.backquote = backquotelist;
10644 if (readtoken() != TPIPE)
10646 app = &ap->narg.next;
10649 //ap->narg.next = NULL;
10650 if (lasttoken != TRP)
10651 raise_error_unexpected_syntax(TRP);
10652 cp->nclist.body = list(2);
10654 cpp = &cp->nclist.next;
10656 checkkwd = CHKNL | CHKKWD;
10660 raise_error_unexpected_syntax(TENDCASE);
10667 n1 = stzalloc(sizeof(struct nredir));
10668 n1->type = NSUBSHELL;
10669 n1->nredir.n = list(0);
10670 /*n1->nredir.redirect = NULL; - stzalloc did it */
10680 return simplecmd();
10683 if (readtoken() != t)
10684 raise_error_unexpected_syntax(t);
10687 /* Now check for redirection which may follow command */
10688 checkkwd = CHKKWD | CHKALIAS;
10690 while (readtoken() == TREDIR) {
10691 *rpp = n2 = redirnode;
10692 rpp = &n2->nfile.next;
10698 if (n1->type != NSUBSHELL) {
10699 n2 = stzalloc(sizeof(struct nredir));
10704 n1->nredir.redirect = redir;
10709 #if ENABLE_ASH_BASH_COMPAT
10710 static int decode_dollar_squote(void)
10712 static const char C_escapes[] ALIGN1 = "nrbtfav""x\\01234567";
10718 p = strchr(C_escapes, c);
10723 if ((unsigned char)(c - '0') <= 7) { /* \ooo */
10727 } while ((unsigned char)(c - '0') <= 7 && --cnt);
10729 } else if (c == 'x') { /* \xHH */
10733 } while (isxdigit(c) && --cnt);
10735 if (cnt == 3) { /* \x but next char is "bad" */
10739 } else { /* simple seq like \\ or \t */
10744 c = bb_process_escape_sequence((void*)&p);
10745 } else { /* unrecognized "\z": print both chars unless ' or " */
10746 if (c != '\'' && c != '"') {
10748 c |= 0x100; /* "please encode \, then me" */
10756 * If eofmark is NULL, read a word or a redirection symbol. If eofmark
10757 * is not NULL, read a here document. In the latter case, eofmark is the
10758 * word which marks the end of the document and striptabs is true if
10759 * leading tabs should be stripped from the document. The argument firstc
10760 * is the first character of the input token or document.
10762 * Because C does not have internal subroutines, I have simulated them
10763 * using goto's to implement the subroutine linkage. The following macros
10764 * will run code that appears at the end of readtoken1.
10766 #define CHECKEND() {goto checkend; checkend_return:;}
10767 #define PARSEREDIR() {goto parseredir; parseredir_return:;}
10768 #define PARSESUB() {goto parsesub; parsesub_return:;}
10769 #define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;}
10770 #define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;}
10771 #define PARSEARITH() {goto parsearith; parsearith_return:;}
10773 readtoken1(int firstc, int syntax, char *eofmark, int striptabs)
10775 /* NB: syntax parameter fits into smallint */
10779 char line[EOFMARKLEN + 1];
10780 struct nodelist *bqlist;
10784 smallint prevsyntax; /* syntax before arithmetic */
10785 #if ENABLE_ASH_EXPAND_PRMT
10786 smallint pssyntax; /* we are expanding a prompt string */
10788 int varnest; /* levels of variables expansion */
10789 int arinest; /* levels of arithmetic expansion */
10790 int parenlevel; /* levels of parens in arithmetic */
10791 int dqvarnest; /* levels of variables expansion within double quotes */
10793 IF_ASH_BASH_COMPAT(smallint bash_dollar_squote = 0;)
10796 /* Avoid longjmp clobbering */
10802 (void) &parenlevel;
10805 (void) &prevsyntax;
10808 startlinno = g_parsefile->linno;
10813 #if ENABLE_ASH_EXPAND_PRMT
10814 pssyntax = (syntax == PSSYNTAX);
10818 dblquote = (syntax == DQSYNTAX);
10824 STARTSTACKSTR(out);
10826 /* For each line, until end of word */
10828 CHECKEND(); /* set c to PEOF if at end of here document */
10829 for (;;) { /* until end of line or end of word */
10830 CHECKSTRSPACE(4, out); /* permit 4 calls to USTPUTC */
10831 switch (SIT(c, syntax)) {
10832 case CNL: /* '\n' */
10833 if (syntax == BASESYNTAX)
10834 goto endword; /* exit outer loop */
10836 g_parsefile->linno++;
10840 goto loop; /* continue outer loop */
10845 if (eofmark == NULL || dblquote)
10846 USTPUTC(CTLESC, out);
10847 #if ENABLE_ASH_BASH_COMPAT
10848 if (c == '\\' && bash_dollar_squote) {
10849 c = decode_dollar_squote();
10851 USTPUTC('\\', out);
10852 c = (unsigned char)c;
10858 case CBACK: /* backslash */
10861 USTPUTC(CTLESC, out);
10862 USTPUTC('\\', out);
10864 } else if (c == '\n') {
10868 #if ENABLE_ASH_EXPAND_PRMT
10869 if (c == '$' && pssyntax) {
10870 USTPUTC(CTLESC, out);
10871 USTPUTC('\\', out);
10874 if (dblquote && c != '\\'
10875 && c != '`' && c != '$'
10876 && (c != '"' || eofmark != NULL)
10878 USTPUTC(CTLESC, out);
10879 USTPUTC('\\', out);
10881 if (SIT(c, SQSYNTAX) == CCTL)
10882 USTPUTC(CTLESC, out);
10890 if (eofmark == NULL) {
10891 USTPUTC(CTLQUOTEMARK, out);
10899 IF_ASH_BASH_COMPAT(bash_dollar_squote = 0;)
10900 if (eofmark != NULL && arinest == 0
10905 if (dqvarnest == 0) {
10906 syntax = BASESYNTAX;
10913 case CVAR: /* '$' */
10914 PARSESUB(); /* parse substitution */
10916 case CENDVAR: /* '}' */
10919 if (dqvarnest > 0) {
10922 USTPUTC(CTLENDVAR, out);
10927 #if ENABLE_SH_MATH_SUPPORT
10928 case CLP: /* '(' in arithmetic */
10932 case CRP: /* ')' in arithmetic */
10933 if (parenlevel > 0) {
10937 if (pgetc() == ')') {
10938 if (--arinest == 0) {
10939 USTPUTC(CTLENDARI, out);
10940 syntax = prevsyntax;
10941 dblquote = (syntax == DQSYNTAX);
10946 * unbalanced parens
10947 * (don't 2nd guess - no error)
10955 case CBQUOTE: /* '`' */
10959 goto endword; /* exit outer loop */
10963 if (varnest == 0) {
10964 #if ENABLE_ASH_BASH_COMPAT
10966 if (pgetc() == '>')
10967 c = 0x100 + '>'; /* flag &> */
10971 goto endword; /* exit outer loop */
10973 #if ENABLE_ASH_ALIAS
10983 #if ENABLE_SH_MATH_SUPPORT
10984 if (syntax == ARISYNTAX)
10985 raise_error_syntax("missing '))'");
10987 if (syntax != BASESYNTAX && !parsebackquote && eofmark == NULL)
10988 raise_error_syntax("unterminated quoted string");
10989 if (varnest != 0) {
10990 startlinno = g_parsefile->linno;
10992 raise_error_syntax("missing '}'");
10994 USTPUTC('\0', out);
10995 len = out - (char *)stackblock();
10996 out = stackblock();
10997 if (eofmark == NULL) {
10998 if ((c == '>' || c == '<' IF_ASH_BASH_COMPAT( || c == 0x100 + '>'))
11001 if (isdigit_str9(out)) {
11002 PARSEREDIR(); /* passed as params: out, c */
11003 lasttoken = TREDIR;
11006 /* else: non-number X seen, interpret it
11007 * as "NNNX>file" = "NNNX >file" */
11011 quoteflag = quotef;
11012 backquotelist = bqlist;
11013 grabstackblock(len);
11017 /* end of readtoken routine */
11020 * Check to see whether we are at the end of the here document. When this
11021 * is called, c is set to the first character of the next input line. If
11022 * we are at the end of the here document, this routine sets the c to PEOF.
11026 #if ENABLE_ASH_ALIAS
11032 while (c == '\t') {
11036 if (c == *eofmark) {
11037 if (pfgets(line, sizeof(line)) != NULL) {
11041 for (q = eofmark + 1; *q && *p == *q; p++, q++)
11043 if (*p == '\n' && *q == '\0') {
11045 g_parsefile->linno++;
11046 needprompt = doprompt;
11048 pushstring(line, NULL);
11053 goto checkend_return;
11057 * Parse a redirection operator. The variable "out" points to a string
11058 * specifying the fd to be redirected. The variable "c" contains the
11059 * first character of the redirection operator.
11062 /* out is already checked to be a valid number or "" */
11063 int fd = (*out == '\0' ? -1 : atoi(out));
11066 np = stzalloc(sizeof(struct nfile));
11071 np->type = NAPPEND;
11073 np->type = NCLOBBER;
11076 /* it also can be NTO2 (>&file), but we can't figure it out yet */
11082 #if ENABLE_ASH_BASH_COMPAT
11083 else if (c == 0x100 + '>') { /* this flags &> redirection */
11085 pgetc(); /* this is '>', no need to check */
11089 else { /* c == '<' */
11090 /*np->nfile.fd = 0; - stzalloc did it */
11094 if (sizeof(struct nfile) != sizeof(struct nhere)) {
11095 np = stzalloc(sizeof(struct nhere));
11096 /*np->nfile.fd = 0; - stzalloc did it */
11099 heredoc = stzalloc(sizeof(struct heredoc));
11100 heredoc->here = np;
11103 heredoc->striptabs = 1;
11105 /*heredoc->striptabs = 0; - stzalloc did it */
11111 np->type = NFROMFD;
11115 np->type = NFROMTO;
11127 goto parseredir_return;
11131 * Parse a substitution. At this point, we have read the dollar sign
11132 * and nothing else.
11135 /* is_special(c) evaluates to 1 for c in "!#$*-0123456789?@"; 0 otherwise
11136 * (assuming ascii char codes, as the original implementation did) */
11137 #define is_special(c) \
11138 (((unsigned)(c) - 33 < 32) \
11139 && ((0xc1ff920dU >> ((unsigned)(c) - 33)) & 1))
11145 static const char types[] ALIGN1 = "}-+?=";
11148 if (c <= PEOA_OR_PEOF
11149 || (c != '(' && c != '{' && !is_name(c) && !is_special(c))
11151 #if ENABLE_ASH_BASH_COMPAT
11153 bash_dollar_squote = 1;
11158 } else if (c == '(') { /* $(command) or $((arith)) */
11159 if (pgetc() == '(') {
11160 #if ENABLE_SH_MATH_SUPPORT
11163 raise_error_syntax("you disabled math support for $((arith)) syntax");
11170 USTPUTC(CTLVAR, out);
11171 typeloc = out - (char *)stackblock();
11172 USTPUTC(VSNORMAL, out);
11173 subtype = VSNORMAL;
11181 subtype = VSLENGTH;
11185 if (c > PEOA_OR_PEOF && is_name(c)) {
11189 } while (c > PEOA_OR_PEOF && is_in_name(c));
11190 } else if (isdigit(c)) {
11194 } while (isdigit(c));
11195 } else if (is_special(c)) {
11200 raise_error_syntax("bad substitution");
11205 if (subtype == 0) {
11209 #if ENABLE_ASH_BASH_COMPAT
11210 if (c == ':' || c == '$' || isdigit(c)) {
11212 subtype = VSSUBSTR;
11219 p = strchr(types, c);
11222 subtype = p - types + VSNORMAL;
11227 subtype = c == '#' ? VSTRIMLEFT : VSTRIMRIGHT;
11235 #if ENABLE_ASH_BASH_COMPAT
11237 subtype = VSREPLACE;
11240 subtype++; /* VSREPLACEALL */
11249 if (dblquote || arinest)
11251 *((char *)stackblock() + typeloc) = subtype | flags;
11252 if (subtype != VSNORMAL) {
11254 if (dblquote || arinest) {
11259 goto parsesub_return;
11263 * Called to parse command substitutions. Newstyle is set if the command
11264 * is enclosed inside $(...); nlpp is a pointer to the head of the linked
11265 * list of commands (passed by reference), and savelen is the number of
11266 * characters on the top of the stack which must be preserved.
11269 struct nodelist **nlpp;
11272 char *volatile str;
11273 struct jmploc jmploc;
11274 struct jmploc *volatile savehandler;
11276 smallint saveprompt = 0;
11279 (void) &saveprompt;
11281 savepbq = parsebackquote;
11282 if (setjmp(jmploc.loc)) {
11284 parsebackquote = 0;
11285 exception_handler = savehandler;
11286 longjmp(exception_handler->loc, 1);
11290 savelen = out - (char *)stackblock();
11292 str = ckmalloc(savelen);
11293 memcpy(str, stackblock(), savelen);
11295 savehandler = exception_handler;
11296 exception_handler = &jmploc;
11299 /* We must read until the closing backquote, giving special
11300 treatment to some slashes, and then push the string and
11301 reread it as input, interpreting it normally. */
11308 STARTSTACKSTR(pout);
11321 g_parsefile->linno++;
11325 * If eating a newline, avoid putting
11326 * the newline into the new character
11327 * stream (via the STPUTC after the
11332 if (pc != '\\' && pc != '`' && pc != '$'
11333 && (!dblquote || pc != '"'))
11334 STPUTC('\\', pout);
11335 if (pc > PEOA_OR_PEOF) {
11341 #if ENABLE_ASH_ALIAS
11344 startlinno = g_parsefile->linno;
11345 raise_error_syntax("EOF in backquote substitution");
11348 g_parsefile->linno++;
11349 needprompt = doprompt;
11358 STPUTC('\0', pout);
11359 psavelen = pout - (char *)stackblock();
11360 if (psavelen > 0) {
11361 pstr = grabstackstr(pout);
11362 setinputstring(pstr);
11367 nlpp = &(*nlpp)->next;
11368 *nlpp = stzalloc(sizeof(**nlpp));
11369 /* (*nlpp)->next = NULL; - stzalloc did it */
11370 parsebackquote = oldstyle;
11373 saveprompt = doprompt;
11380 doprompt = saveprompt;
11381 else if (readtoken() != TRP)
11382 raise_error_unexpected_syntax(TRP);
11387 * Start reading from old file again, ignoring any pushed back
11388 * tokens left from the backquote parsing
11393 while (stackblocksize() <= savelen)
11395 STARTSTACKSTR(out);
11397 memcpy(out, str, savelen);
11398 STADJUST(savelen, out);
11404 parsebackquote = savepbq;
11405 exception_handler = savehandler;
11406 if (arinest || dblquote)
11407 USTPUTC(CTLBACKQ | CTLQUOTE, out);
11409 USTPUTC(CTLBACKQ, out);
11411 goto parsebackq_oldreturn;
11412 goto parsebackq_newreturn;
11415 #if ENABLE_SH_MATH_SUPPORT
11417 * Parse an arithmetic expansion (indicate start of one and set state)
11420 if (++arinest == 1) {
11421 prevsyntax = syntax;
11422 syntax = ARISYNTAX;
11423 USTPUTC(CTLARI, out);
11430 * we collapse embedded arithmetic expansion to
11431 * parenthesis, which should be equivalent
11435 goto parsearith_return;
11439 } /* end of readtoken */
11442 * Read the next input token.
11443 * If the token is a word, we set backquotelist to the list of cmds in
11444 * backquotes. We set quoteflag to true if any part of the word was
11446 * If the token is TREDIR, then we set redirnode to a structure containing
11448 * In all cases, the variable startlinno is set to the number of the line
11449 * on which the token starts.
11451 * [Change comment: here documents and internal procedures]
11452 * [Readtoken shouldn't have any arguments. Perhaps we should make the
11453 * word parsing code into a separate routine. In this case, readtoken
11454 * doesn't need to have any internal procedures, but parseword does.
11455 * We could also make parseoperator in essence the main routine, and
11456 * have parseword (readtoken1?) handle both words and redirection.]
11458 #define NEW_xxreadtoken
11459 #ifdef NEW_xxreadtoken
11460 /* singles must be first! */
11461 static const char xxreadtoken_chars[7] ALIGN1 = {
11462 '\n', '(', ')', /* singles */
11463 '&', '|', ';', /* doubles */
11467 #define xxreadtoken_singles 3
11468 #define xxreadtoken_doubles 3
11470 static const char xxreadtoken_tokens[] ALIGN1 = {
11471 TNL, TLP, TRP, /* only single occurrence allowed */
11472 TBACKGND, TPIPE, TSEMI, /* if single occurrence */
11473 TEOF, /* corresponds to trailing nul */
11474 TAND, TOR, TENDCASE /* if double occurrence */
11489 startlinno = g_parsefile->linno;
11490 for (;;) { /* until token or start of word found */
11492 if (c == ' ' || c == '\t' IF_ASH_ALIAS( || c == PEOA))
11496 while ((c = pgetc()) != '\n' && c != PEOF)
11499 } else if (c == '\\') {
11500 if (pgetc() != '\n') {
11502 break; /* return readtoken1(...) */
11504 startlinno = ++g_parsefile->linno;
11510 p = xxreadtoken_chars + sizeof(xxreadtoken_chars) - 1;
11513 g_parsefile->linno++;
11514 needprompt = doprompt;
11517 p = strchr(xxreadtoken_chars, c);
11519 break; /* return readtoken1(...) */
11521 if ((int)(p - xxreadtoken_chars) >= xxreadtoken_singles) {
11523 if (cc == c) { /* double occurrence? */
11524 p += xxreadtoken_doubles + 1;
11527 #if ENABLE_ASH_BASH_COMPAT
11528 if (c == '&' && cc == '>') /* &> */
11529 break; /* return readtoken1(...) */
11534 lasttoken = xxreadtoken_tokens[p - xxreadtoken_chars];
11539 return readtoken1(c, BASESYNTAX, (char *) NULL, 0);
11541 #else /* old xxreadtoken */
11542 #define RETURN(token) return lasttoken = token
11555 startlinno = g_parsefile->linno;
11556 for (;;) { /* until token or start of word found */
11559 case ' ': case '\t':
11560 #if ENABLE_ASH_ALIAS
11565 while ((c = pgetc()) != '\n' && c != PEOF)
11570 if (pgetc() == '\n') {
11571 startlinno = ++g_parsefile->linno;
11579 g_parsefile->linno++;
11580 needprompt = doprompt;
11585 if (pgetc() == '&')
11590 if (pgetc() == '|')
11595 if (pgetc() == ';')
11608 return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
11611 #endif /* old xxreadtoken */
11618 smallint alreadyseen = tokpushback;
11621 #if ENABLE_ASH_ALIAS
11630 if (checkkwd & CHKNL) {
11637 if (t != TWORD || quoteflag) {
11642 * check for keywords
11644 if (checkkwd & CHKKWD) {
11645 const char *const *pp;
11647 pp = findkwd(wordtext);
11649 lasttoken = t = pp - tokname_array;
11650 TRACE(("keyword %s recognized\n", tokname(t)));
11655 if (checkkwd & CHKALIAS) {
11656 #if ENABLE_ASH_ALIAS
11658 ap = lookupalias(wordtext, 1);
11661 pushstring(ap->val, ap);
11671 TRACE(("token %s %s\n", tokname(t), t == TWORD ? wordtext : ""));
11673 TRACE(("reread token %s %s\n", tokname(t), t == TWORD ? wordtext : ""));
11685 return tokname_array[t][0];
11689 * Read and parse a command. Returns NODE_EOF on end of file.
11690 * (NULL is a valid parse tree indicating a blank line.)
11692 static union node *
11693 parsecmd(int interact)
11698 doprompt = interact;
11700 setprompt(doprompt);
11712 * Input any here documents.
11717 struct heredoc *here;
11720 here = heredoclist;
11721 heredoclist = NULL;
11727 readtoken1(pgetc(), here->here->type == NHERE? SQSYNTAX : DQSYNTAX,
11728 here->eofmark, here->striptabs);
11729 n = stzalloc(sizeof(struct narg));
11730 n->narg.type = NARG;
11731 /*n->narg.next = NULL; - stzalloc did it */
11732 n->narg.text = wordtext;
11733 n->narg.backquote = backquotelist;
11734 here->here->nhere.doc = n;
11741 * called by editline -- any expansions to the prompt should be added here.
11743 #if ENABLE_ASH_EXPAND_PRMT
11744 static const char *
11745 expandstr(const char *ps)
11749 /* XXX Fix (char *) cast. It _is_ a bug. ps is variable's value,
11750 * and token processing _can_ alter it (delete NULs etc). */
11751 setinputstring((char *)ps);
11752 readtoken1(pgetc(), PSSYNTAX, nullstr, 0);
11755 n.narg.type = NARG;
11756 n.narg.next = NULL;
11757 n.narg.text = wordtext;
11758 n.narg.backquote = backquotelist;
11760 expandarg(&n, NULL, 0);
11761 return stackblock();
11766 * Execute a command or commands contained in a string.
11769 evalstring(char *s, int mask)
11772 struct stackmark smark;
11776 setstackmark(&smark);
11779 while ((n = parsecmd(0)) != NODE_EOF) {
11781 popstackmark(&smark);
11794 * The eval command.
11796 static int FAST_FUNC
11797 evalcmd(int argc UNUSED_PARAM, char **argv)
11806 STARTSTACKSTR(concat);
11808 concat = stack_putstr(p, concat);
11812 STPUTC(' ', concat);
11814 STPUTC('\0', concat);
11815 p = grabstackstr(concat);
11817 evalstring(p, ~SKIPEVAL);
11824 * Read and execute commands. "Top" is nonzero for the top level command
11825 * loop; it turns on prompting if the shell is interactive.
11831 struct stackmark smark;
11835 TRACE(("cmdloop(%d) called\n", top));
11839 setstackmark(&smark);
11842 showjobs(stderr, SHOW_CHANGED);
11845 if (iflag && top) {
11847 #if ENABLE_ASH_MAIL
11851 n = parsecmd(inter);
11853 if (debug && (n != NODE_EOF))
11856 if (n == NODE_EOF) {
11857 if (!top || numeof >= 50)
11859 if (!stoppedjobs()) {
11862 out2str("\nUse \"exit\" to leave shell.\n");
11865 } else if (nflag == 0) {
11866 /* job_warning can only be 2,1,0. Here 2->1, 1/0->0 */
11871 popstackmark(&smark);
11876 return skip & SKIPEVAL;
11883 * Take commands from a file. To be compatible we should do a path
11884 * search for the file, which is necessary to find sub-commands.
11887 find_dot_file(char *name)
11890 const char *path = pathval();
11893 /* don't try this for absolute or relative paths */
11894 if (strchr(name, '/'))
11897 /* IIRC standards do not say whether . is to be searched.
11898 * And it is even smaller this way, making it unconditional for now:
11900 if (1) { /* ENABLE_ASH_BASH_COMPAT */
11905 while ((fullname = path_advance(&path, name)) != NULL) {
11907 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
11909 * Don't bother freeing here, since it will
11910 * be freed by the caller.
11914 if (fullname != name)
11915 stunalloc(fullname);
11918 /* not found in the PATH */
11919 ash_msg_and_raise_error("%s: not found", name);
11923 static int FAST_FUNC
11924 dotcmd(int argc, char **argv)
11926 struct strlist *sp;
11927 volatile struct shparam saveparam;
11930 for (sp = cmdenviron; sp; sp = sp->next)
11931 setvareq(ckstrdup(sp->text), VSTRFIXED | VTEXTFIXED);
11933 if (argv[1]) { /* That's what SVR2 does */
11934 char *fullname = find_dot_file(argv[1]);
11937 if (argc) { /* argc > 0, argv[0] != NULL */
11938 saveparam = shellparam;
11939 shellparam.malloced = 0;
11940 shellparam.nparam = argc;
11941 shellparam.p = argv;
11944 setinputfile(fullname, INPUT_PUSH_FILE);
11945 commandname = fullname;
11950 freeparam(&shellparam);
11951 shellparam = saveparam;
11953 status = exitstatus;
11958 static int FAST_FUNC
11959 exitcmd(int argc UNUSED_PARAM, char **argv)
11964 exitstatus = number(argv[1]);
11965 raise_exception(EXEXIT);
11970 * Read a file containing shell functions.
11973 readcmdfile(char *name)
11975 setinputfile(name, INPUT_PUSH_FILE);
11981 /* ============ find_command inplementation */
11984 * Resolve a command name. If you change this routine, you may have to
11985 * change the shellexec routine as well.
11988 find_command(char *name, struct cmdentry *entry, int act, const char *path)
11990 struct tblentry *cmdp;
11997 struct builtincmd *bcmd;
11999 /* If name contains a slash, don't use PATH or hash table */
12000 if (strchr(name, '/') != NULL) {
12001 entry->u.index = -1;
12002 if (act & DO_ABS) {
12003 while (stat(name, &statb) < 0) {
12005 if (errno == EINTR)
12008 entry->cmdtype = CMDUNKNOWN;
12012 entry->cmdtype = CMDNORMAL;
12016 /* #if ENABLE_FEATURE_SH_STANDALONE... moved after builtin check */
12018 updatetbl = (path == pathval());
12021 if (strstr(path, "%builtin") != NULL)
12022 act |= DO_ALTBLTIN;
12025 /* If name is in the table, check answer will be ok */
12026 cmdp = cmdlookup(name, 0);
12027 if (cmdp != NULL) {
12030 switch (cmdp->cmdtype) {
12048 } else if (cmdp->rehash == 0)
12049 /* if not invalidated by cd, we're done */
12053 /* If %builtin not in path, check for builtin next */
12054 bcmd = find_builtin(name);
12056 if (IS_BUILTIN_REGULAR(bcmd))
12057 goto builtin_success;
12058 if (act & DO_ALTPATH) {
12059 if (!(act & DO_ALTBLTIN))
12060 goto builtin_success;
12061 } else if (builtinloc <= 0) {
12062 goto builtin_success;
12066 #if ENABLE_FEATURE_SH_STANDALONE
12068 int applet_no = find_applet_by_name(name);
12069 if (applet_no >= 0) {
12070 entry->cmdtype = CMDNORMAL;
12071 entry->u.index = -2 - applet_no;
12077 /* We have to search path. */
12078 prev = -1; /* where to start */
12079 if (cmdp && cmdp->rehash) { /* doing a rehash */
12080 if (cmdp->cmdtype == CMDBUILTIN)
12083 prev = cmdp->param.index;
12089 while ((fullname = path_advance(&path, name)) != NULL) {
12090 stunalloc(fullname);
12091 /* NB: code below will still use fullname
12092 * despite it being "unallocated" */
12095 if (prefix(pathopt, "builtin")) {
12097 goto builtin_success;
12100 if ((act & DO_NOFUNC)
12101 || !prefix(pathopt, "func")
12102 ) { /* ignore unimplemented options */
12106 /* if rehash, don't redo absolute path names */
12107 if (fullname[0] == '/' && idx <= prev) {
12110 TRACE(("searchexec \"%s\": no change\n", name));
12113 while (stat(fullname, &statb) < 0) {
12115 if (errno == EINTR)
12118 if (errno != ENOENT && errno != ENOTDIR)
12122 e = EACCES; /* if we fail, this will be the error */
12123 if (!S_ISREG(statb.st_mode))
12125 if (pathopt) { /* this is a %func directory */
12126 stalloc(strlen(fullname) + 1);
12127 /* NB: stalloc will return space pointed by fullname
12128 * (because we don't have any intervening allocations
12129 * between stunalloc above and this stalloc) */
12130 readcmdfile(fullname);
12131 cmdp = cmdlookup(name, 0);
12132 if (cmdp == NULL || cmdp->cmdtype != CMDFUNCTION)
12133 ash_msg_and_raise_error("%s not defined in %s", name, fullname);
12134 stunalloc(fullname);
12137 TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
12139 entry->cmdtype = CMDNORMAL;
12140 entry->u.index = idx;
12144 cmdp = cmdlookup(name, 1);
12145 cmdp->cmdtype = CMDNORMAL;
12146 cmdp->param.index = idx;
12151 /* We failed. If there was an entry for this command, delete it */
12152 if (cmdp && updatetbl)
12153 delete_cmd_entry();
12155 ash_msg("%s: %s", name, errmsg(e, "not found"));
12156 entry->cmdtype = CMDUNKNOWN;
12161 entry->cmdtype = CMDBUILTIN;
12162 entry->u.cmd = bcmd;
12166 cmdp = cmdlookup(name, 1);
12167 cmdp->cmdtype = CMDBUILTIN;
12168 cmdp->param.cmd = bcmd;
12172 entry->cmdtype = cmdp->cmdtype;
12173 entry->u = cmdp->param;
12177 /* ============ trap.c */
12180 * The trap builtin.
12182 static int FAST_FUNC
12183 trapcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12192 for (signo = 0; signo < NSIG; signo++) {
12193 if (trap[signo] != NULL) {
12194 out1fmt("trap -- %s %s\n",
12195 single_quote(trap[signo]),
12196 get_signame(signo));
12205 signo = get_signum(*ap);
12207 ash_msg_and_raise_error("%s: bad trap", *ap);
12210 if (LONE_DASH(action))
12213 action = ckstrdup(action);
12216 trap[signo] = action;
12226 /* ============ Builtins */
12228 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
12230 * Lists available builtins
12232 static int FAST_FUNC
12233 helpcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12239 "Built-in commands:\n"
12240 "------------------\n");
12241 for (col = 0, i = 0; i < ARRAY_SIZE(builtintab); i++) {
12242 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '),
12243 builtintab[i].name + 1);
12249 #if ENABLE_FEATURE_SH_STANDALONE
12251 const char *a = applet_names;
12253 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '), a);
12258 a += strlen(a) + 1;
12263 return EXIT_SUCCESS;
12265 #endif /* FEATURE_SH_EXTRA_QUIET */
12268 * The export and readonly commands.
12270 static int FAST_FUNC
12271 exportcmd(int argc UNUSED_PARAM, char **argv)
12277 int flag = argv[0][0] == 'r' ? VREADONLY : VEXPORT;
12279 if (nextopt("p") != 'p') {
12284 p = strchr(name, '=');
12288 vp = *findvar(hashvar(name), name);
12294 setvar(name, p, flag);
12295 } while ((name = *++aptr) != NULL);
12299 showvars(argv[0], flag, 0);
12304 * Delete a function if it exists.
12307 unsetfunc(const char *name)
12309 struct tblentry *cmdp;
12311 cmdp = cmdlookup(name, 0);
12312 if (cmdp!= NULL && cmdp->cmdtype == CMDFUNCTION)
12313 delete_cmd_entry();
12317 * The unset builtin command. We unset the function before we unset the
12318 * variable to allow a function to be unset when there is a readonly variable
12319 * with the same name.
12321 static int FAST_FUNC
12322 unsetcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12329 while ((i = nextopt("vf")) != '\0') {
12333 for (ap = argptr; *ap; ap++) {
12349 #include <sys/times.h>
12351 static const unsigned char timescmd_str[] ALIGN1 = {
12352 ' ', offsetof(struct tms, tms_utime),
12353 '\n', offsetof(struct tms, tms_stime),
12354 ' ', offsetof(struct tms, tms_cutime),
12355 '\n', offsetof(struct tms, tms_cstime),
12359 static int FAST_FUNC
12360 timescmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12362 long clk_tck, s, t;
12363 const unsigned char *p;
12366 clk_tck = sysconf(_SC_CLK_TCK);
12371 t = *(clock_t *)(((char *) &buf) + p[1]);
12373 out1fmt("%ldm%ld.%.3lds%c",
12375 ((t - s * clk_tck) * 1000) / clk_tck,
12377 } while (*(p += 2));
12382 #if ENABLE_SH_MATH_SUPPORT
12384 * The let builtin. partial stolen from GNU Bash, the Bourne Again SHell.
12385 * Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
12387 * Copyright (C) 2003 Vladimir Oleynik <dzo@simtreas.ru>
12389 static int FAST_FUNC
12390 letcmd(int argc UNUSED_PARAM, char **argv)
12396 ash_msg_and_raise_error("expression expected");
12398 i = ash_arith(*argv);
12403 #endif /* SH_MATH_SUPPORT */
12406 /* ============ miscbltin.c
12408 * Miscellaneous builtins.
12413 #if defined(__GLIBC__) && __GLIBC__ == 2 && __GLIBC_MINOR__ < 1
12414 typedef enum __rlimit_resource rlim_t;
12418 * The read builtin. Options:
12419 * -r Do not interpret '\' specially
12420 * -s Turn off echo (tty only)
12421 * -n NCHARS Read NCHARS max
12422 * -p PROMPT Display PROMPT on stderr (if input is from tty)
12423 * -t SECONDS Timeout after SECONDS (tty or pipe only)
12424 * -u FD Read from given FD instead of fd 0
12425 * This uses unbuffered input, which may be avoidable in some cases.
12426 * TODO: bash also has:
12427 * -a ARRAY Read into array[0],[1],etc
12428 * -d DELIM End on DELIM char, not newline
12429 * -e Use line editing (tty only)
12431 static int FAST_FUNC
12432 readcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12434 static const char *const arg_REPLY[] = { "REPLY", NULL };
12447 #if ENABLE_ASH_READ_NCHARS
12448 int nchars = 0; /* if != 0, -n is in effect */
12450 struct termios tty, old_tty;
12452 #if ENABLE_ASH_READ_TIMEOUT
12453 unsigned end_ms = 0;
12454 unsigned timeout = 0;
12459 while ((i = nextopt("p:u:r"
12460 IF_ASH_READ_TIMEOUT("t:")
12461 IF_ASH_READ_NCHARS("n:s")
12465 prompt = optionarg;
12467 #if ENABLE_ASH_READ_NCHARS
12469 nchars = bb_strtou(optionarg, NULL, 10);
12470 if (nchars < 0 || errno)
12471 ash_msg_and_raise_error("invalid count");
12472 /* nchars == 0: off (bash 3.2 does this too) */
12478 #if ENABLE_ASH_READ_TIMEOUT
12480 timeout = bb_strtou(optionarg, NULL, 10);
12481 if (errno || timeout > UINT_MAX / 2048)
12482 ash_msg_and_raise_error("invalid timeout");
12484 #if 0 /* even bash have no -t N.NNN support */
12485 ts.tv_sec = bb_strtou(optionarg, &p, 10);
12487 /* EINVAL means number is ok, but not terminated by NUL */
12488 if (*p == '.' && errno == EINVAL) {
12492 ts.tv_usec = bb_strtou(p, &p2, 10);
12494 ash_msg_and_raise_error("invalid timeout");
12496 /* normalize to usec */
12498 ash_msg_and_raise_error("invalid timeout");
12499 while (scale++ < 6)
12502 } else if (ts.tv_sec < 0 || errno) {
12503 ash_msg_and_raise_error("invalid timeout");
12505 if (!(ts.tv_sec | ts.tv_usec)) { /* both are 0? */
12506 ash_msg_and_raise_error("invalid timeout");
12515 fd = bb_strtou(optionarg, NULL, 10);
12516 if (fd < 0 || errno)
12517 ash_msg_and_raise_error("invalid file descriptor");
12523 if (prompt && isatty(fd)) {
12528 ap = (char**)arg_REPLY;
12529 ifs = bltinlookup("IFS");
12532 #if ENABLE_ASH_READ_NCHARS
12533 tcgetattr(fd, &tty);
12535 if (nchars || silent) {
12537 tty.c_lflag &= ~ICANON;
12538 tty.c_cc[VMIN] = nchars < 256 ? nchars : 255;
12541 tty.c_lflag &= ~(ECHO | ECHOK | ECHONL);
12543 /* if tcgetattr failed, tcsetattr will fail too.
12544 * Ignoring, it's harmless. */
12545 tcsetattr(fd, TCSANOW, &tty);
12552 #if ENABLE_ASH_READ_TIMEOUT
12553 if (timeout) /* NB: ensuring end_ms is nonzero */
12554 end_ms = ((unsigned)(monotonic_us() / 1000) + timeout) | 1;
12558 const char *is_ifs;
12560 #if ENABLE_ASH_READ_TIMEOUT
12562 struct pollfd pfd[1];
12564 pfd[0].events = POLLIN;
12565 timeout = end_ms - (unsigned)(monotonic_us() / 1000);
12566 if ((int)timeout <= 0 /* already late? */
12567 || safe_poll(pfd, 1, timeout) != 1 /* no? wait... */
12568 ) { /* timed out! */
12569 #if ENABLE_ASH_READ_NCHARS
12570 tcsetattr(fd, TCSANOW, &old_tty);
12576 if (nonblock_safe_read(fd, &c, 1) != 1) {
12588 if (!rflag && c == '\\') {
12594 /* $IFS splitting */
12595 /* http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_06_05 */
12596 is_ifs = strchr(ifs, c);
12597 if (startword && is_ifs) {
12600 /* it is a non-space ifs char */
12602 if (startword == 1) /* first one? */
12603 continue; /* yes, it is not next word yet */
12606 if (ap[1] != NULL && is_ifs) {
12609 beg = stackblock();
12610 setvar(*ap, beg, 0);
12612 /* can we skip one non-space ifs char? (2: yes) */
12613 startword = isspace(c) ? 2 : 1;
12620 /* end of do {} while: */
12621 #if ENABLE_ASH_READ_NCHARS
12627 #if ENABLE_ASH_READ_NCHARS
12628 tcsetattr(fd, TCSANOW, &old_tty);
12632 /* Remove trailing space ifs chars */
12633 while ((char *)stackblock() <= --p && isspace(*p) && strchr(ifs, *p) != NULL)
12635 setvar(*ap, stackblock(), 0);
12636 while (*++ap != NULL)
12637 setvar(*ap, nullstr, 0);
12641 static int FAST_FUNC
12642 umaskcmd(int argc UNUSED_PARAM, char **argv)
12644 static const char permuser[3] ALIGN1 = "ugo";
12645 static const char permmode[3] ALIGN1 = "rwx";
12646 static const short permmask[] ALIGN2 = {
12647 S_IRUSR, S_IWUSR, S_IXUSR,
12648 S_IRGRP, S_IWGRP, S_IXGRP,
12649 S_IROTH, S_IWOTH, S_IXOTH
12652 /* TODO: use bb_parse_mode() instead */
12657 int symbolic_mode = 0;
12659 while (nextopt("S") != '\0') {
12670 if (symbolic_mode) {
12674 for (i = 0; i < 3; i++) {
12677 *p++ = permuser[i];
12679 for (j = 0; j < 3; j++) {
12680 if ((mask & permmask[3 * i + j]) == 0) {
12681 *p++ = permmode[j];
12689 out1fmt("%.4o\n", mask);
12692 if (isdigit((unsigned char) *ap)) {
12695 if (*ap >= '8' || *ap < '0')
12696 ash_msg_and_raise_error(illnum, argv[1]);
12697 mask = (mask << 3) + (*ap - '0');
12698 } while (*++ap != '\0');
12701 mask = ~mask & 0777;
12702 if (!bb_parse_mode(ap, &mask)) {
12703 ash_msg_and_raise_error("illegal mode: %s", ap);
12705 umask(~mask & 0777);
12714 * This code, originally by Doug Gwyn, Doug Kingston, Eric Gisin, and
12715 * Michael Rendell was ripped from pdksh 5.0.8 and hacked for use with
12716 * ash by J.T. Conklin.
12721 uint8_t cmd; /* RLIMIT_xxx fit into it */
12722 uint8_t factor_shift; /* shift by to get rlim_{cur,max} values */
12726 static const struct limits limits_tbl[] = {
12728 { RLIMIT_CPU, 0, 't' },
12730 #ifdef RLIMIT_FSIZE
12731 { RLIMIT_FSIZE, 9, 'f' },
12734 { RLIMIT_DATA, 10, 'd' },
12736 #ifdef RLIMIT_STACK
12737 { RLIMIT_STACK, 10, 's' },
12740 { RLIMIT_CORE, 9, 'c' },
12743 { RLIMIT_RSS, 10, 'm' },
12745 #ifdef RLIMIT_MEMLOCK
12746 { RLIMIT_MEMLOCK, 10, 'l' },
12748 #ifdef RLIMIT_NPROC
12749 { RLIMIT_NPROC, 0, 'p' },
12751 #ifdef RLIMIT_NOFILE
12752 { RLIMIT_NOFILE, 0, 'n' },
12755 { RLIMIT_AS, 10, 'v' },
12757 #ifdef RLIMIT_LOCKS
12758 { RLIMIT_LOCKS, 0, 'w' },
12761 static const char limits_name[] =
12763 "time(seconds)" "\0"
12765 #ifdef RLIMIT_FSIZE
12766 "file(blocks)" "\0"
12771 #ifdef RLIMIT_STACK
12775 "coredump(blocks)" "\0"
12780 #ifdef RLIMIT_MEMLOCK
12781 "locked memory(kb)" "\0"
12783 #ifdef RLIMIT_NPROC
12786 #ifdef RLIMIT_NOFILE
12792 #ifdef RLIMIT_LOCKS
12797 enum limtype { SOFT = 0x1, HARD = 0x2 };
12800 printlim(enum limtype how, const struct rlimit *limit,
12801 const struct limits *l)
12805 val = limit->rlim_max;
12807 val = limit->rlim_cur;
12809 if (val == RLIM_INFINITY)
12810 out1fmt("unlimited\n");
12812 val >>= l->factor_shift;
12813 out1fmt("%lld\n", (long long) val);
12817 static int FAST_FUNC
12818 ulimitcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12822 enum limtype how = SOFT | HARD;
12823 const struct limits *l;
12826 struct rlimit limit;
12829 while ((optc = nextopt("HSa"
12833 #ifdef RLIMIT_FSIZE
12839 #ifdef RLIMIT_STACK
12848 #ifdef RLIMIT_MEMLOCK
12851 #ifdef RLIMIT_NPROC
12854 #ifdef RLIMIT_NOFILE
12860 #ifdef RLIMIT_LOCKS
12878 for (l = limits_tbl; l->option != what; l++)
12881 set = *argptr ? 1 : 0;
12885 if (all || argptr[1])
12886 ash_msg_and_raise_error("too many arguments");
12887 if (strncmp(p, "unlimited\n", 9) == 0)
12888 val = RLIM_INFINITY;
12892 while ((c = *p++) >= '0' && c <= '9') {
12893 val = (val * 10) + (long)(c - '0');
12894 // val is actually 'unsigned long int' and can't get < 0
12895 if (val < (rlim_t) 0)
12899 ash_msg_and_raise_error("bad number");
12900 val <<= l->factor_shift;
12904 const char *lname = limits_name;
12905 for (l = limits_tbl; l != &limits_tbl[ARRAY_SIZE(limits_tbl)]; l++) {
12906 getrlimit(l->cmd, &limit);
12907 out1fmt("%-20s ", lname);
12908 lname += strlen(lname) + 1;
12909 printlim(how, &limit, l);
12914 getrlimit(l->cmd, &limit);
12917 limit.rlim_max = val;
12919 limit.rlim_cur = val;
12920 if (setrlimit(l->cmd, &limit) < 0)
12921 ash_msg_and_raise_error("error setting limit (%m)");
12923 printlim(how, &limit, l);
12928 /* ============ main() and helpers */
12931 * Called to exit the shell.
12933 static void exitshell(void) NORETURN;
12941 status = exitstatus;
12942 TRACE(("pid %d, exitshell(%d)\n", getpid(), status));
12943 if (setjmp(loc.loc)) {
12944 if (exception_type == EXEXIT)
12945 /* dash bug: it just does _exit(exitstatus) here
12946 * but we have to do setjobctl(0) first!
12947 * (bug is still not fixed in dash-0.5.3 - if you run dash
12948 * under Midnight Commander, on exit from dash MC is backgrounded) */
12949 status = exitstatus;
12952 exception_handler = &loc;
12958 flush_stdout_stderr();
12968 /* from input.c: */
12969 basepf.next_to_pgetc = basepf.buf = basebuf;
12972 signal(SIGCHLD, SIG_DFL);
12977 char ppid[sizeof(int)*3 + 1];
12979 struct stat st1, st2;
12982 for (envp = environ; envp && *envp; envp++) {
12983 if (strchr(*envp, '=')) {
12984 setvareq(*envp, VEXPORT|VTEXTFIXED);
12988 snprintf(ppid, sizeof(ppid), "%u", (unsigned) getppid());
12989 setvar("PPID", ppid, 0);
12991 p = lookupvar("PWD");
12993 if (*p != '/' || stat(p, &st1) || stat(".", &st2)
12994 || st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino)
13001 * Process the shell command line arguments.
13004 procargs(char **argv)
13007 const char *xminusc;
13012 /* if (xargv[0]) - mmm, this is always true! */
13014 for (i = 0; i < NOPTS; i++)
13018 /* it already printed err message */
13019 raise_exception(EXERROR);
13023 if (*xargv == NULL) {
13025 ash_msg_and_raise_error(bb_msg_requires_arg, "-c");
13028 if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
13032 for (i = 0; i < NOPTS; i++)
13033 if (optlist[i] == 2)
13038 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
13043 } else if (!sflag) {
13044 setinputfile(*xargv, 0);
13047 commandname = arg0;
13050 shellparam.p = xargv;
13051 #if ENABLE_ASH_GETOPTS
13052 shellparam.optind = 1;
13053 shellparam.optoff = -1;
13055 /* assert(shellparam.malloced == 0 && shellparam.nparam == 0); */
13057 shellparam.nparam++;
13064 * Read /etc/profile or .profile.
13067 read_profile(const char *name)
13071 if (setinputfile(name, INPUT_PUSH_FILE | INPUT_NOFILE_OK) < 0)
13080 * This routine is called when an error or an interrupt occurs in an
13081 * interactive shell and control is returned to the main command loop.
13089 /* from input.c: */
13090 g_parsefile->left_in_buffer = 0;
13091 g_parsefile->left_in_line = 0; /* clear input buffer */
13093 /* from parser.c: */
13096 /* from redir.c: */
13097 clearredir(/*drop:*/ 0);
13101 static short profile_buf[16384];
13102 extern int etext();
13106 * Main routine. We initialize things, parse the arguments, execute
13107 * profiles if we're a login shell, and then call cmdloop to execute
13108 * commands. The setjmp call sets up the location to jump to when an
13109 * exception occurs. When an exception occurs the variable "state"
13110 * is used to figure out how far we had gotten.
13112 int ash_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
13113 int ash_main(int argc UNUSED_PARAM, char **argv)
13115 const char *shinit;
13116 volatile smallint state;
13117 struct jmploc jmploc;
13118 struct stackmark smark;
13120 /* Initialize global data */
13124 #if ENABLE_ASH_ALIAS
13130 monitor(4, etext, profile_buf, sizeof(profile_buf), 50);
13133 #if ENABLE_FEATURE_EDITING
13134 line_input_state = new_line_input_t(FOR_SHELL | WITH_PATH_LOOKUP);
13137 if (setjmp(jmploc.loc)) {
13143 e = exception_type;
13147 if (e == EXEXIT || s == 0 || iflag == 0 || shlvl)
13150 outcslow('\n', stderr);
13152 popstackmark(&smark);
13153 FORCE_INT_ON; /* enable interrupts */
13162 exception_handler = &jmploc;
13165 TRACE(("Shell args: "));
13166 trace_puts_args(argv);
13168 rootpid = getpid();
13170 #if ENABLE_ASH_RANDOM_SUPPORT
13171 /* Can use monotonic_ns() for better randomness but for now it is
13172 * not used anywhere else in busybox... so avoid bloat */
13173 random_galois_LFSR = random_LCG = rootpid + monotonic_us();
13176 setstackmark(&smark);
13179 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
13181 const char *hp = lookupvar("HISTFILE");
13184 hp = lookupvar("HOME");
13186 char *defhp = concat_path_file(hp, ".ash_history");
13187 setvar("HISTFILE", defhp, 0);
13193 if (/* argv[0] && */ argv[0][0] == '-')
13197 read_profile("/etc/profile");
13200 read_profile(".profile");
13206 getuid() == geteuid() && getgid() == getegid() &&
13210 shinit = lookupvar("ENV");
13211 if (shinit != NULL && *shinit != '\0') {
13212 read_profile(shinit);
13218 /* evalstring pushes parsefile stack.
13219 * Ensure we don't falsely claim that 0 (stdin)
13220 * is one of stacked source fds.
13221 * Testcase: ash -c 'exec 1>&0' must not complain. */
13223 g_parsefile->fd = -1;
13224 evalstring(minusc, 0);
13227 if (sflag || minusc == NULL) {
13228 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
13230 const char *hp = lookupvar("HISTFILE");
13232 line_input_state->hist_file = hp;
13235 state4: /* XXX ??? - why isn't this before the "if" statement */
13243 extern void _mcleanup(void);
13253 * Copyright (c) 1989, 1991, 1993, 1994
13254 * The Regents of the University of California. All rights reserved.
13256 * This code is derived from software contributed to Berkeley by
13257 * Kenneth Almquist.
13259 * Redistribution and use in source and binary forms, with or without
13260 * modification, are permitted provided that the following conditions
13262 * 1. Redistributions of source code must retain the above copyright
13263 * notice, this list of conditions and the following disclaimer.
13264 * 2. Redistributions in binary form must reproduce the above copyright
13265 * notice, this list of conditions and the following disclaimer in the
13266 * documentation and/or other materials provided with the distribution.
13267 * 3. Neither the name of the University nor the names of its contributors
13268 * may be used to endorse or promote products derived from this software
13269 * without specific prior written permission.
13271 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
13272 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
13273 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
13274 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
13275 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
13276 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
13277 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
13278 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
13279 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
13280 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF