1 /* vi: set sw=4 ts=4: */
3 * ash shell port for busybox
5 * This code is derived from software contributed to Berkeley by
8 * Original BSD copyright notice is retained at the end of this file.
10 * Copyright (c) 1989, 1991, 1993, 1994
11 * The Regents of the University of California. All rights reserved.
13 * Copyright (c) 1997-2005 Herbert Xu <herbert@gondor.apana.org.au>
14 * was re-ported from NetBSD and debianized.
16 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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 (DEBUG is 1 and "set -o debug" was executed),
27 * debugging info will be written to ./trace and a quit signal
28 * will generate a core dump.
31 /* Tweak debug output verbosity here */
38 #define JOBS ENABLE_ASH_JOB_CONTROL
43 #include <sys/times.h>
44 #include <sys/utsname.h> /* for setting $HOSTNAME */
46 #include "busybox.h" /* for applet_names */
49 #include "shell_common.h"
50 #if ENABLE_SH_MATH_SUPPORT
53 #if ENABLE_ASH_RANDOM_SUPPORT
56 # define CLEAR_RANDOM_T(rnd) ((void)0)
59 #include "NUM_APPLETS.h"
61 /* STANDALONE does not make sense, and won't compile */
62 # undef CONFIG_FEATURE_SH_STANDALONE
63 # undef ENABLE_FEATURE_SH_STANDALONE
64 # undef IF_FEATURE_SH_STANDALONE
65 # undef IF_NOT_FEATURE_SH_STANDALONE
66 # define ENABLE_FEATURE_SH_STANDALONE 0
67 # define IF_FEATURE_SH_STANDALONE(...)
68 # define IF_NOT_FEATURE_SH_STANDALONE(...) __VA_ARGS__
72 # define PIPE_BUF 4096 /* amount of buffering in a pipe */
76 # error "Do not even bother, ash will not run on NOMMU machine"
82 //config: depends on !NOMMU
84 //config: Tha 'ash' shell adds about 60k in the default configuration and is
85 //config: the most complete and most pedantically correct shell included with
86 //config: busybox. This shell is actually a derivative of the Debian 'dash'
87 //config: shell (by Herbert Xu), which was created by porting the 'ash' shell
88 //config: (written by Kenneth Almquist) from NetBSD.
90 //config:config ASH_BASH_COMPAT
91 //config: bool "bash-compatible extensions"
93 //config: depends on ASH
95 //config: Enable bash-compatible extensions.
97 //config:config ASH_IDLE_TIMEOUT
98 //config: bool "Idle timeout variable"
100 //config: depends on ASH
102 //config: Enables bash-like auto-logout after $TMOUT seconds of idle time.
104 //config:config ASH_JOB_CONTROL
105 //config: bool "Job control"
107 //config: depends on ASH
109 //config: Enable job control in the ash shell.
111 //config:config ASH_ALIAS
112 //config: bool "Alias support"
114 //config: depends on ASH
116 //config: Enable alias support in the ash shell.
118 //config:config ASH_GETOPTS
119 //config: bool "Builtin getopt to parse positional parameters"
121 //config: depends on ASH
123 //config: Enable support for getopts builtin in ash.
125 //config:config ASH_BUILTIN_ECHO
126 //config: bool "Builtin version of 'echo'"
128 //config: depends on ASH
130 //config: Enable support for echo builtin in ash.
132 //config:config ASH_BUILTIN_PRINTF
133 //config: bool "Builtin version of 'printf'"
135 //config: depends on ASH
137 //config: Enable support for printf builtin in ash.
139 //config:config ASH_BUILTIN_TEST
140 //config: bool "Builtin version of 'test'"
142 //config: depends on ASH
144 //config: Enable support for test builtin in ash.
146 //config:config ASH_HELP
147 //config: bool "help builtin"
149 //config: depends on ASH
151 //config: Enable help builtin in ash.
153 //config:config ASH_CMDCMD
154 //config: bool "'command' command to override shell builtins"
156 //config: depends on ASH
158 //config: Enable support for the ash 'command' builtin, which allows
159 //config: you to run the specified command with the specified arguments,
160 //config: even when there is an ash builtin command with the same name.
162 //config:config ASH_MAIL
163 //config: bool "Check for new mail on interactive shells"
165 //config: depends on ASH
167 //config: Enable "check for new mail" function in the ash shell.
169 //config:config ASH_OPTIMIZE_FOR_SIZE
170 //config: bool "Optimize for size instead of speed"
172 //config: depends on ASH
174 //config: Compile ash for reduced size at the price of speed.
176 //config:config ASH_RANDOM_SUPPORT
177 //config: bool "Pseudorandom generator and $RANDOM variable"
179 //config: depends on ASH
181 //config: Enable pseudorandom generator and dynamic variable "$RANDOM".
182 //config: Each read of "$RANDOM" will generate a new pseudorandom value.
183 //config: You can reset the generator by using a specified start value.
184 //config: After "unset RANDOM" the generator will switch off and this
185 //config: variable will no longer have special treatment.
187 //config:config ASH_EXPAND_PRMT
188 //config: bool "Expand prompt string"
190 //config: depends on ASH
192 //config: "PS#" may contain volatile content, such as backquote commands.
193 //config: This option recreates the prompt string from the environment
194 //config: variable each time it is displayed.
197 //applet:IF_ASH(APPLET(ash, BB_DIR_BIN, BB_SUID_DROP))
198 //applet:IF_FEATURE_SH_IS_ASH(APPLET_ODDNAME(sh, ash, BB_DIR_BIN, BB_SUID_DROP, sh))
199 //applet:IF_FEATURE_BASH_IS_ASH(APPLET_ODDNAME(bash, ash, BB_DIR_BIN, BB_SUID_DROP, bash))
201 //kbuild:lib-$(CONFIG_ASH) += ash.o ash_ptr_hack.o shell_common.o
202 //kbuild:lib-$(CONFIG_ASH_RANDOM_SUPPORT) += random.o
205 /* ============ Hash table sizes. Configurable. */
209 #define CMDTABLESIZE 31 /* should be prime */
212 /* ============ Shell options */
214 static const char *const optletters_optnames[] = {
229 #if ENABLE_ASH_BASH_COMPAT
238 #define optletters(n) optletters_optnames[n][0]
239 #define optnames(n) (optletters_optnames[n] + 1)
241 enum { NOPTS = ARRAY_SIZE(optletters_optnames) };
244 /* ============ Misc data */
246 #define msg_illnum "Illegal number: %s"
249 * We enclose jmp_buf in a structure so that we can declare pointers to
250 * jump locations. The global variable handler contains the location to
251 * jump to when an exception occurs, and the global variable exception_type
252 * contains a code identifying the exception. To implement nested
253 * exception handlers, the user should save the value of handler on entry
254 * to an inner scope, set handler to point to a jmploc structure for the
255 * inner scope, and restore handler on exit from the scope.
261 struct globals_misc {
262 /* pid of main shell */
264 /* shell level: 0 for the main shell, 1 for its children, and so on */
266 #define rootshell (!shlvl)
267 char *minusc; /* argument to -c option */
269 char *curdir; // = nullstr; /* current working directory */
270 char *physdir; // = nullstr; /* physical working directory */
272 char *arg0; /* value of $0 */
274 struct jmploc *exception_handler;
276 volatile int suppress_int; /* counter */
277 volatile /*sig_atomic_t*/ smallint pending_int; /* 1 = got SIGINT */
278 /* last pending signal */
279 volatile /*sig_atomic_t*/ smallint pending_sig;
280 smallint exception_type; /* kind of exception (0..5) */
282 #define EXINT 0 /* SIGINT received */
283 #define EXERROR 1 /* a generic error */
284 #define EXSHELLPROC 2 /* execute a shell procedure */
285 #define EXEXEC 3 /* command execution failed */
286 #define EXEXIT 4 /* exit the shell */
287 #define EXSIG 5 /* trapped signal in wait(1) */
290 char nullstr[1]; /* zero length string */
293 #define eflag optlist[0]
294 #define fflag optlist[1]
295 #define Iflag optlist[2]
296 #define iflag optlist[3]
297 #define mflag optlist[4]
298 #define nflag optlist[5]
299 #define sflag optlist[6]
300 #define xflag optlist[7]
301 #define vflag optlist[8]
302 #define Cflag optlist[9]
303 #define aflag optlist[10]
304 #define bflag optlist[11]
305 #define uflag optlist[12]
306 #define viflag optlist[13]
307 #if ENABLE_ASH_BASH_COMPAT
308 # define pipefail optlist[14]
313 # define nolog optlist[14 + ENABLE_ASH_BASH_COMPAT]
314 # define debug optlist[15 + ENABLE_ASH_BASH_COMPAT]
317 /* trap handler commands */
319 * Sigmode records the current value of the signal handlers for the various
320 * modes. A value of zero means that the current handler is not known.
321 * S_HARD_IGN indicates that the signal was ignored on entry to the shell.
323 char sigmode[NSIG - 1];
324 #define S_DFL 1 /* default signal handling (SIG_DFL) */
325 #define S_CATCH 2 /* signal is caught */
326 #define S_IGN 3 /* signal is ignored (SIG_IGN) */
327 #define S_HARD_IGN 4 /* signal is ignored permanently */
329 /* indicates specified signal received */
330 uint8_t gotsig[NSIG - 1]; /* offset by 1: "signal" 0 is meaningless */
331 uint8_t may_have_traps; /* 0: definitely no traps are set, 1: some traps may be set */
333 char **trap_ptr; /* used only by "trap hack" */
335 /* Rarely referenced stuff */
336 #if ENABLE_ASH_RANDOM_SUPPORT
339 pid_t backgndpid; /* pid of last background process */
340 smallint job_warning; /* user was warned about stopped jobs (can be 2, 1 or 0). */
342 extern struct globals_misc *const ash_ptr_to_globals_misc;
343 #define G_misc (*ash_ptr_to_globals_misc)
344 #define rootpid (G_misc.rootpid )
345 #define shlvl (G_misc.shlvl )
346 #define minusc (G_misc.minusc )
347 #define curdir (G_misc.curdir )
348 #define physdir (G_misc.physdir )
349 #define arg0 (G_misc.arg0 )
350 #define exception_handler (G_misc.exception_handler)
351 #define exception_type (G_misc.exception_type )
352 #define suppress_int (G_misc.suppress_int )
353 #define pending_int (G_misc.pending_int )
354 #define pending_sig (G_misc.pending_sig )
355 #define isloginsh (G_misc.isloginsh )
356 #define nullstr (G_misc.nullstr )
357 #define optlist (G_misc.optlist )
358 #define sigmode (G_misc.sigmode )
359 #define gotsig (G_misc.gotsig )
360 #define may_have_traps (G_misc.may_have_traps )
361 #define trap (G_misc.trap )
362 #define trap_ptr (G_misc.trap_ptr )
363 #define random_gen (G_misc.random_gen )
364 #define backgndpid (G_misc.backgndpid )
365 #define job_warning (G_misc.job_warning)
366 #define INIT_G_misc() do { \
367 (*(struct globals_misc**)&ash_ptr_to_globals_misc) = xzalloc(sizeof(G_misc)); \
375 /* ============ DEBUG */
377 static void trace_printf(const char *fmt, ...);
378 static void trace_vprintf(const char *fmt, va_list va);
379 # define TRACE(param) trace_printf param
380 # define TRACEV(param) trace_vprintf param
381 # define close(fd) do { \
383 if (close(dfd) < 0) \
384 bb_error_msg("bug on %d: closing %d(0x%x)", \
385 __LINE__, dfd, dfd); \
388 # define TRACE(param)
389 # define TRACEV(param)
393 /* ============ Utility functions */
394 #define xbarrier() do { __asm__ __volatile__ ("": : :"memory"); } while (0)
396 #define is_name(c) ((c) == '_' || isalpha((unsigned char)(c)))
397 #define is_in_name(c) ((c) == '_' || isalnum((unsigned char)(c)))
399 static int isdigit_str9(const char *str)
401 int maxlen = 9 + 1; /* max 9 digits: 999999999 */
402 while (--maxlen && isdigit(*str))
404 return (*str == '\0');
407 static const char *var_end(const char *var)
416 /* ============ Interrupts / exceptions */
418 static void exitshell(void) NORETURN;
421 * These macros allow the user to suspend the handling of interrupt signals
422 * over a period of time. This is similar to SIGHOLD or to sigblock, but
423 * much more efficient and portable. (But hacking the kernel is so much
424 * more fun than worrying about efficiency and portability. :-))
426 #define INT_OFF do { \
432 * Called to raise an exception. Since C doesn't include exceptions, we
433 * just do a longjmp to the exception handler. The type of exception is
434 * stored in the global variable "exception_type".
436 static void raise_exception(int) NORETURN;
438 raise_exception(int e)
441 if (exception_handler == NULL)
446 longjmp(exception_handler->loc, 1);
449 #define raise_exception(e) do { \
450 TRACE(("raising exception %d on line %d\n", (e), __LINE__)); \
451 raise_exception(e); \
456 * Called from trap.c when a SIGINT is received. (If the user specifies
457 * that SIGINT is to be trapped or ignored using the trap builtin, then
458 * this routine is not called.) Suppressint is nonzero when interrupts
459 * are held using the INT_OFF macro. (The test for iflag is just
460 * defensive programming.)
462 static void raise_interrupt(void) NORETURN;
464 raise_interrupt(void)
469 /* Signal is not automatically unmasked after it is raised,
470 * do it ourself - unmask all signals */
471 sigprocmask_allsigs(SIG_UNBLOCK);
472 /* pending_sig = 0; - now done in signal_handler() */
475 if (gotsig[SIGINT - 1] && !trap[SIGINT]) {
476 if (!(rootshell && iflag)) {
477 /* Kill ourself with SIGINT */
478 signal(SIGINT, SIG_DFL);
483 raise_exception(ex_type);
487 #define raise_interrupt() do { \
488 TRACE(("raising interrupt on line %d\n", __LINE__)); \
493 static IF_ASH_OPTIMIZE_FOR_SIZE(inline) void
497 if (--suppress_int == 0 && pending_int) {
501 #define INT_ON int_on()
502 static IF_ASH_OPTIMIZE_FOR_SIZE(inline) void
510 #define FORCE_INT_ON force_int_on()
512 #define SAVE_INT(v) ((v) = suppress_int)
514 #define RESTORE_INT(v) do { \
516 suppress_int = (v); \
517 if (suppress_int == 0 && pending_int) \
522 /* ============ Stdout/stderr output */
525 outstr(const char *p, FILE *file)
533 flush_stdout_stderr(void)
540 /* Was called outcslow(c,FILE*), but c was always '\n' */
542 newline_and_flush(FILE *dest)
550 static int out1fmt(const char *, ...) __attribute__((__format__(__printf__,1,2)));
552 out1fmt(const char *fmt, ...)
559 r = vprintf(fmt, ap);
565 static int fmtstr(char *, size_t, const char *, ...) __attribute__((__format__(__printf__,3,4)));
567 fmtstr(char *outbuf, size_t length, const char *fmt, ...)
574 ret = vsnprintf(outbuf, length, fmt, ap);
581 out1str(const char *p)
587 out2str(const char *p)
590 flush_stdout_stderr();
594 /* ============ Parser structures */
596 /* control characters in argument strings */
597 #define CTL_FIRST CTLESC
598 #define CTLESC ((unsigned char)'\201') /* escape next character */
599 #define CTLVAR ((unsigned char)'\202') /* variable defn */
600 #define CTLENDVAR ((unsigned char)'\203')
601 #define CTLBACKQ ((unsigned char)'\204')
602 #define CTLARI ((unsigned char)'\206') /* arithmetic expression */
603 #define CTLENDARI ((unsigned char)'\207')
604 #define CTLQUOTEMARK ((unsigned char)'\210')
605 #define CTL_LAST CTLQUOTEMARK
607 /* variable substitution byte (follows CTLVAR) */
608 #define VSTYPE 0x0f /* type of variable substitution */
609 #define VSNUL 0x10 /* colon--treat the empty string as unset */
611 /* values of VSTYPE field */
612 #define VSNORMAL 0x1 /* normal variable: $var or ${var} */
613 #define VSMINUS 0x2 /* ${var-text} */
614 #define VSPLUS 0x3 /* ${var+text} */
615 #define VSQUESTION 0x4 /* ${var?message} */
616 #define VSASSIGN 0x5 /* ${var=text} */
617 #define VSTRIMRIGHT 0x6 /* ${var%pattern} */
618 #define VSTRIMRIGHTMAX 0x7 /* ${var%%pattern} */
619 #define VSTRIMLEFT 0x8 /* ${var#pattern} */
620 #define VSTRIMLEFTMAX 0x9 /* ${var##pattern} */
621 #define VSLENGTH 0xa /* ${#var} */
622 #if ENABLE_ASH_BASH_COMPAT
623 #define VSSUBSTR 0xc /* ${var:position:length} */
624 #define VSREPLACE 0xd /* ${var/pattern/replacement} */
625 #define VSREPLACEALL 0xe /* ${var//pattern/replacement} */
628 static const char dolatstr[] ALIGN1 = {
629 CTLQUOTEMARK, CTLVAR, VSNORMAL, '@', '=', CTLQUOTEMARK, '\0'
631 #define DOLATSTRLEN 6
650 #if ENABLE_ASH_BASH_COMPAT
667 smallint type; /* Nxxxx */
670 union node *redirect;
675 smallint pipe_backgnd;
676 struct nodelist *cmdlist;
682 union node *redirect;
695 union node *elsepart;
722 struct nodelist *backquote;
725 /* nfile and ndup layout must match!
726 * NTOFD (>&fdnum) uses ndup structure, but we may discover mid-flight
727 * that it is actually NTO2 (>&file), and change its type.
744 char *_unused_expfname;
763 struct nredir nredir;
764 struct nbinary nbinary;
768 struct nclist nclist;
777 * NODE_EOF is returned by parsecmd when it encounters an end of file.
778 * It must be distinct from NULL.
780 #define NODE_EOF ((union node *) -1L)
783 struct nodelist *next;
796 freefunc(struct funcnode *f)
798 if (f && --f->count < 0)
803 /* ============ Debugging output */
807 static FILE *tracefile;
810 trace_printf(const char *fmt, ...)
817 fprintf(tracefile, "%u ", (int) time(NULL));
819 fprintf(tracefile, "[%u] ", (int) getpid());
821 fprintf(tracefile, "pending s:%d i:%d(supp:%d) ", pending_sig, pending_int, suppress_int);
823 vfprintf(tracefile, fmt, va);
828 trace_vprintf(const char *fmt, va_list va)
833 fprintf(tracefile, "%u ", (int) time(NULL));
835 fprintf(tracefile, "[%u] ", (int) getpid());
837 fprintf(tracefile, "pending s:%d i:%d(supp:%d) ", pending_sig, pending_int, suppress_int);
838 vfprintf(tracefile, fmt, va);
842 trace_puts(const char *s)
850 trace_puts_quoted(char *s)
857 putc('"', tracefile);
858 for (p = s; *p; p++) {
859 switch ((unsigned char)*p) {
860 case '\n': c = 'n'; goto backslash;
861 case '\t': c = 't'; goto backslash;
862 case '\r': c = 'r'; goto backslash;
863 case '\"': c = '\"'; goto backslash;
864 case '\\': c = '\\'; goto backslash;
865 case CTLESC: c = 'e'; goto backslash;
866 case CTLVAR: c = 'v'; goto backslash;
867 case CTLBACKQ: c = 'q'; goto backslash;
869 putc('\\', tracefile);
873 if (*p >= ' ' && *p <= '~')
876 putc('\\', tracefile);
877 putc((*p >> 6) & 03, tracefile);
878 putc((*p >> 3) & 07, tracefile);
879 putc(*p & 07, tracefile);
884 putc('"', tracefile);
888 trace_puts_args(char **ap)
895 trace_puts_quoted(*ap);
897 putc('\n', tracefile);
900 putc(' ', tracefile);
915 /* leave open because libedit might be using it */
918 strcpy(s, "./trace");
920 if (!freopen(s, "a", tracefile)) {
921 fprintf(stderr, "Can't re-open %s\n", s);
926 tracefile = fopen(s, "a");
927 if (tracefile == NULL) {
928 fprintf(stderr, "Can't open %s\n", s);
934 flags = fcntl(fileno(tracefile), F_GETFL);
936 fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND);
938 setlinebuf(tracefile);
939 fputs("\nTracing started.\n", tracefile);
943 indent(int amount, char *pfx, FILE *fp)
947 for (i = 0; i < amount; i++) {
948 if (pfx && i == amount - 1)
954 /* little circular references here... */
955 static void shtree(union node *n, int ind, char *pfx, FILE *fp);
958 sharg(union node *arg, FILE *fp)
961 struct nodelist *bqlist;
962 unsigned char subtype;
964 if (arg->type != NARG) {
965 out1fmt("<node type %d>\n", arg->type);
968 bqlist = arg->narg.backquote;
969 for (p = arg->narg.text; *p; p++) {
970 switch ((unsigned char)*p) {
979 if (subtype == VSLENGTH)
990 switch (subtype & VSTYPE) {
1016 case VSTRIMRIGHTMAX:
1023 out1fmt("<subtype %d>", subtype);
1032 shtree(bqlist->n, -1, NULL, fp);
1043 shcmd(union node *cmd, FILE *fp)
1051 for (np = cmd->ncmd.args; np; np = np->narg.next) {
1057 for (np = cmd->ncmd.redirect; np; np = np->nfile.next) {
1061 switch (np->nfile.type) {
1062 case NTO: s = ">>"+1; dftfd = 1; break;
1063 case NCLOBBER: s = ">|"; dftfd = 1; break;
1064 case NAPPEND: s = ">>"; dftfd = 1; break;
1065 #if ENABLE_ASH_BASH_COMPAT
1068 case NTOFD: s = ">&"; dftfd = 1; break;
1069 case NFROM: s = "<"; break;
1070 case NFROMFD: s = "<&"; break;
1071 case NFROMTO: s = "<>"; break;
1072 default: s = "*error*"; break;
1074 if (np->nfile.fd != dftfd)
1075 fprintf(fp, "%d", np->nfile.fd);
1077 if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) {
1078 fprintf(fp, "%d", np->ndup.dupfd);
1080 sharg(np->nfile.fname, fp);
1087 shtree(union node *n, int ind, char *pfx, FILE *fp)
1089 struct nodelist *lp;
1095 indent(ind, pfx, fp);
1097 if (n == NODE_EOF) {
1112 shtree(n->nbinary.ch1, ind, NULL, fp);
1115 shtree(n->nbinary.ch2, ind, NULL, fp);
1123 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
1124 shtree(lp->n, 0, NULL, fp);
1128 if (n->npipe.pipe_backgnd)
1134 fprintf(fp, "<node type %d>", n->type);
1142 showtree(union node *n)
1144 trace_puts("showtree called\n");
1145 shtree(n, 1, NULL, stderr);
1151 /* ============ Parser data */
1154 * ash_vmsg() needs parsefile->fd, hence parsefile definition is moved up.
1157 struct strlist *next;
1164 struct strpush *prev; /* preceding string on stack */
1166 int prev_left_in_line;
1167 #if ENABLE_ASH_ALIAS
1168 struct alias *ap; /* if push was associated with an alias */
1170 char *string; /* remember the string since it may change */
1174 struct parsefile *prev; /* preceding file on stack */
1175 int linno; /* current line */
1176 int pf_fd; /* file descriptor (or -1 if string) */
1177 int left_in_line; /* number of chars left in this line */
1178 int left_in_buffer; /* number of chars left in this buffer past the line */
1179 char *next_to_pgetc; /* next char in buffer */
1180 char *buf; /* input buffer */
1181 struct strpush *strpush; /* for pushing strings at this level */
1182 struct strpush basestrpush; /* so pushing one is fast */
1185 static struct parsefile basepf; /* top level input file */
1186 static struct parsefile *g_parsefile = &basepf; /* current input file */
1187 static int startlinno; /* line # where last token started */
1188 static char *commandname; /* currently executing command */
1189 static struct strlist *cmdenviron; /* environment for builtin command */
1190 static uint8_t exitstatus; /* exit status of last command */
1193 /* ============ Message printing */
1196 ash_vmsg(const char *msg, va_list ap)
1198 fprintf(stderr, "%s: ", arg0);
1200 if (strcmp(arg0, commandname))
1201 fprintf(stderr, "%s: ", commandname);
1202 if (!iflag || g_parsefile->pf_fd > 0)
1203 fprintf(stderr, "line %d: ", startlinno);
1205 vfprintf(stderr, msg, ap);
1206 newline_and_flush(stderr);
1210 * Exverror is called to raise the error exception. If the second argument
1211 * is not NULL then error prints an error message using printf style
1212 * formatting. It then raises the error exception.
1214 static void ash_vmsg_and_raise(int, const char *, va_list) NORETURN;
1216 ash_vmsg_and_raise(int cond, const char *msg, va_list ap)
1220 TRACE(("ash_vmsg_and_raise(%d, \"", cond));
1222 TRACE(("\") pid=%d\n", getpid()));
1224 TRACE(("ash_vmsg_and_raise(%d, NULL) pid=%d\n", cond, getpid()));
1229 flush_stdout_stderr();
1230 raise_exception(cond);
1234 static void ash_msg_and_raise_error(const char *, ...) NORETURN;
1236 ash_msg_and_raise_error(const char *msg, ...)
1241 ash_vmsg_and_raise(EXERROR, msg, ap);
1246 static void raise_error_syntax(const char *) NORETURN;
1248 raise_error_syntax(const char *msg)
1250 ash_msg_and_raise_error("syntax error: %s", msg);
1254 static void ash_msg_and_raise(int, const char *, ...) NORETURN;
1256 ash_msg_and_raise(int cond, const char *msg, ...)
1261 ash_vmsg_and_raise(cond, msg, ap);
1267 * error/warning routines for external builtins
1270 ash_msg(const char *fmt, ...)
1280 * Return a string describing an error. The returned string may be a
1281 * pointer to a static buffer that will be overwritten on the next call.
1282 * Action describes the operation that got the error.
1285 errmsg(int e, const char *em)
1287 if (e == ENOENT || e == ENOTDIR) {
1294 /* ============ Memory allocation */
1297 /* I consider these wrappers nearly useless:
1298 * ok, they return you to nearest exception handler, but
1299 * how much memory do you leak in the process, making
1300 * memory starvation worse?
1303 ckrealloc(void * p, size_t nbytes)
1305 p = realloc(p, nbytes);
1307 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1312 ckmalloc(size_t nbytes)
1314 return ckrealloc(NULL, nbytes);
1318 ckzalloc(size_t nbytes)
1320 return memset(ckmalloc(nbytes), 0, nbytes);
1324 ckstrdup(const char *s)
1326 char *p = strdup(s);
1328 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1332 /* Using bbox equivalents. They exit if out of memory */
1333 # define ckrealloc xrealloc
1334 # define ckmalloc xmalloc
1335 # define ckzalloc xzalloc
1336 # define ckstrdup xstrdup
1340 * It appears that grabstackstr() will barf with such alignments
1341 * because stalloc() will return a string allocated in a new stackblock.
1343 #define SHELL_ALIGN(nbytes) (((nbytes) + SHELL_SIZE) & ~SHELL_SIZE)
1345 /* Most machines require the value returned from malloc to be aligned
1346 * in some way. The following macro will get this right
1347 * on many machines. */
1348 SHELL_SIZE = sizeof(union { int i; char *cp; double d; }) - 1,
1349 /* Minimum size of a block */
1350 MINSIZE = SHELL_ALIGN(504),
1353 struct stack_block {
1354 struct stack_block *prev;
1355 char space[MINSIZE];
1359 struct stack_block *stackp;
1362 struct stackmark *marknext;
1366 struct globals_memstack {
1367 struct stack_block *g_stackp; // = &stackbase;
1368 struct stackmark *markp;
1369 char *g_stacknxt; // = stackbase.space;
1370 char *sstrend; // = stackbase.space + MINSIZE;
1371 size_t g_stacknleft; // = MINSIZE;
1372 int herefd; // = -1;
1373 struct stack_block stackbase;
1375 extern struct globals_memstack *const ash_ptr_to_globals_memstack;
1376 #define G_memstack (*ash_ptr_to_globals_memstack)
1377 #define g_stackp (G_memstack.g_stackp )
1378 #define markp (G_memstack.markp )
1379 #define g_stacknxt (G_memstack.g_stacknxt )
1380 #define sstrend (G_memstack.sstrend )
1381 #define g_stacknleft (G_memstack.g_stacknleft)
1382 #define herefd (G_memstack.herefd )
1383 #define stackbase (G_memstack.stackbase )
1384 #define INIT_G_memstack() do { \
1385 (*(struct globals_memstack**)&ash_ptr_to_globals_memstack) = xzalloc(sizeof(G_memstack)); \
1387 g_stackp = &stackbase; \
1388 g_stacknxt = stackbase.space; \
1389 g_stacknleft = MINSIZE; \
1390 sstrend = stackbase.space + MINSIZE; \
1395 #define stackblock() ((void *)g_stacknxt)
1396 #define stackblocksize() g_stacknleft
1399 * Parse trees for commands are allocated in lifo order, so we use a stack
1400 * to make this more efficient, and also to avoid all sorts of exception
1401 * handling code to handle interrupts in the middle of a parse.
1403 * The size 504 was chosen because the Ultrix malloc handles that size
1407 stalloc(size_t nbytes)
1412 aligned = SHELL_ALIGN(nbytes);
1413 if (aligned > g_stacknleft) {
1416 struct stack_block *sp;
1418 blocksize = aligned;
1419 if (blocksize < MINSIZE)
1420 blocksize = MINSIZE;
1421 len = sizeof(struct stack_block) - MINSIZE + blocksize;
1422 if (len < blocksize)
1423 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1426 sp->prev = g_stackp;
1427 g_stacknxt = sp->space;
1428 g_stacknleft = blocksize;
1429 sstrend = g_stacknxt + blocksize;
1434 g_stacknxt += aligned;
1435 g_stacknleft -= aligned;
1440 stzalloc(size_t nbytes)
1442 return memset(stalloc(nbytes), 0, nbytes);
1449 if (!p || (g_stacknxt < (char *)p) || ((char *)p < g_stackp->space)) {
1450 write(STDERR_FILENO, "stunalloc\n", 10);
1454 g_stacknleft += g_stacknxt - (char *)p;
1459 * Like strdup but works with the ash stack.
1462 ststrdup(const char *p)
1464 size_t len = strlen(p) + 1;
1465 return memcpy(stalloc(len), p, len);
1469 setstackmark(struct stackmark *mark)
1471 mark->stackp = g_stackp;
1472 mark->stacknxt = g_stacknxt;
1473 mark->stacknleft = g_stacknleft;
1474 mark->marknext = markp;
1479 popstackmark(struct stackmark *mark)
1481 struct stack_block *sp;
1487 markp = mark->marknext;
1488 while (g_stackp != mark->stackp) {
1490 g_stackp = sp->prev;
1493 g_stacknxt = mark->stacknxt;
1494 g_stacknleft = mark->stacknleft;
1495 sstrend = mark->stacknxt + mark->stacknleft;
1500 * When the parser reads in a string, it wants to stick the string on the
1501 * stack and only adjust the stack pointer when it knows how big the
1502 * string is. Stackblock (defined in stack.h) returns a pointer to a block
1503 * of space on top of the stack and stackblocklen returns the length of
1504 * this block. Growstackblock will grow this space by at least one byte,
1505 * possibly moving it (like realloc). Grabstackblock actually allocates the
1506 * part of the block that has been used.
1509 growstackblock(void)
1513 newlen = g_stacknleft * 2;
1514 if (newlen < g_stacknleft)
1515 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1519 if (g_stacknxt == g_stackp->space && g_stackp != &stackbase) {
1520 struct stack_block *oldstackp;
1521 struct stackmark *xmark;
1522 struct stack_block *sp;
1523 struct stack_block *prevstackp;
1527 oldstackp = g_stackp;
1529 prevstackp = sp->prev;
1530 grosslen = newlen + sizeof(struct stack_block) - MINSIZE;
1531 sp = ckrealloc(sp, grosslen);
1532 sp->prev = prevstackp;
1534 g_stacknxt = sp->space;
1535 g_stacknleft = newlen;
1536 sstrend = sp->space + newlen;
1539 * Stack marks pointing to the start of the old block
1540 * must be relocated to point to the new block
1543 while (xmark != NULL && xmark->stackp == oldstackp) {
1544 xmark->stackp = g_stackp;
1545 xmark->stacknxt = g_stacknxt;
1546 xmark->stacknleft = g_stacknleft;
1547 xmark = xmark->marknext;
1551 char *oldspace = g_stacknxt;
1552 size_t oldlen = g_stacknleft;
1553 char *p = stalloc(newlen);
1555 /* free the space we just allocated */
1556 g_stacknxt = memcpy(p, oldspace, oldlen);
1557 g_stacknleft += newlen;
1562 grabstackblock(size_t len)
1564 len = SHELL_ALIGN(len);
1566 g_stacknleft -= len;
1570 * The following routines are somewhat easier to use than the above.
1571 * The user declares a variable of type STACKSTR, which may be declared
1572 * to be a register. The macro STARTSTACKSTR initializes things. Then
1573 * the user uses the macro STPUTC to add characters to the string. In
1574 * effect, STPUTC(c, p) is the same as *p++ = c except that the stack is
1575 * grown as necessary. When the user is done, she can just leave the
1576 * string there and refer to it using stackblock(). Or she can allocate
1577 * the space for it using grabstackstr(). If it is necessary to allow
1578 * someone else to use the stack temporarily and then continue to grow
1579 * the string, the user should use grabstack to allocate the space, and
1580 * then call ungrabstr(p) to return to the previous mode of operation.
1582 * USTPUTC is like STPUTC except that it doesn't check for overflow.
1583 * CHECKSTACKSPACE can be called before USTPUTC to ensure that there
1584 * is space for at least one character.
1589 size_t len = stackblocksize();
1590 if (herefd >= 0 && len >= 1024) {
1591 full_write(herefd, stackblock(), len);
1592 return stackblock();
1595 return (char *)stackblock() + len;
1599 * Called from CHECKSTRSPACE.
1602 makestrspace(size_t newlen, char *p)
1604 size_t len = p - g_stacknxt;
1605 size_t size = stackblocksize();
1610 size = stackblocksize();
1612 if (nleft >= newlen)
1616 return (char *)stackblock() + len;
1620 stack_nputstr(const char *s, size_t n, char *p)
1622 p = makestrspace(n, p);
1623 p = (char *)memcpy(p, s, n) + n;
1628 stack_putstr(const char *s, char *p)
1630 return stack_nputstr(s, strlen(s), p);
1634 _STPUTC(int c, char *p)
1642 #define STARTSTACKSTR(p) ((p) = stackblock())
1643 #define STPUTC(c, p) ((p) = _STPUTC((c), (p)))
1644 #define CHECKSTRSPACE(n, p) do { \
1647 size_t m = sstrend - q; \
1649 (p) = makestrspace(l, q); \
1651 #define USTPUTC(c, p) (*(p)++ = (c))
1652 #define STACKSTRNUL(p) do { \
1653 if ((p) == sstrend) \
1654 (p) = growstackstr(); \
1657 #define STUNPUTC(p) (--(p))
1658 #define STTOPC(p) ((p)[-1])
1659 #define STADJUST(amount, p) ((p) += (amount))
1661 #define grabstackstr(p) stalloc((char *)(p) - (char *)stackblock())
1662 #define ungrabstackstr(s, p) stunalloc(s)
1663 #define stackstrend() ((void *)sstrend)
1666 /* ============ String helpers */
1669 * prefix -- see if pfx is a prefix of string.
1672 prefix(const char *string, const char *pfx)
1675 if (*pfx++ != *string++)
1678 return (char *) string;
1682 * Check for a valid number. This should be elsewhere.
1685 is_number(const char *p)
1690 } while (*++p != '\0');
1695 * Convert a string of digits to an integer, printing an error message on
1699 number(const char *s)
1702 ash_msg_and_raise_error(msg_illnum, s);
1707 * Produce a possibly single quoted string suitable as input to the shell.
1708 * The return string is allocated on the stack.
1711 single_quote(const char *s)
1721 len = strchrnul(s, '\'') - s;
1723 q = p = makestrspace(len + 3, p);
1726 q = (char *)memcpy(q, s, len) + len;
1735 do len++; while (*++s == '\'');
1737 q = p = makestrspace(len + 3, p);
1740 q = (char *)memcpy(q, s - len, len) + len;
1748 return stackblock();
1752 /* ============ nextopt */
1754 static char **argptr; /* argument list for builtin commands */
1755 static char *optionarg; /* set by nextopt (like getopt) */
1756 static char *optptr; /* used by nextopt */
1759 * XXX - should get rid of. Have all builtins use getopt(3).
1760 * The library getopt must have the BSD extension static variable
1761 * "optreset", otherwise it can't be used within the shell safely.
1763 * Standard option processing (a la getopt) for builtin routines.
1764 * The only argument that is passed to nextopt is the option string;
1765 * the other arguments are unnecessary. It returns the character,
1766 * or '\0' on end of input.
1769 nextopt(const char *optstring)
1776 if (p == NULL || *p == '\0') {
1777 /* We ate entire "-param", take next one */
1783 if (*++p == '\0') /* just "-" ? */
1786 if (LONE_DASH(p)) /* "--" ? */
1788 /* p => next "-param" */
1790 /* p => some option char in the middle of a "-param" */
1792 for (q = optstring; *q != c;) {
1794 ash_msg_and_raise_error("illegal option -%c", c);
1802 ash_msg_and_raise_error("no arg for -%c option", c);
1812 /* ============ Shell variables */
1815 * The parsefile structure pointed to by the global variable parsefile
1816 * contains information about the current file being read.
1819 int nparam; /* # of positional parameters (without $0) */
1820 #if ENABLE_ASH_GETOPTS
1821 int optind; /* next parameter to be processed by getopts */
1822 int optoff; /* used by getopts */
1824 unsigned char malloced; /* if parameter list dynamically allocated */
1825 char **p; /* parameter list */
1829 * Free the list of positional parameters.
1832 freeparam(volatile struct shparam *param)
1834 if (param->malloced) {
1836 ap = ap1 = param->p;
1843 #if ENABLE_ASH_GETOPTS
1844 static void FAST_FUNC getoptsreset(const char *value);
1848 struct var *next; /* next entry in hash list */
1849 int flags; /* flags are defined above */
1850 const char *var_text; /* name=value */
1851 void (*var_func)(const char *) FAST_FUNC; /* function to be called when */
1852 /* the variable gets set/unset */
1856 struct localvar *next; /* next local variable in list */
1857 struct var *vp; /* the variable that was made local */
1858 int flags; /* saved flags */
1859 const char *text; /* saved text */
1863 #define VEXPORT 0x01 /* variable is exported */
1864 #define VREADONLY 0x02 /* variable cannot be modified */
1865 #define VSTRFIXED 0x04 /* variable struct is statically allocated */
1866 #define VTEXTFIXED 0x08 /* text is statically allocated */
1867 #define VSTACK 0x10 /* text is allocated on the stack */
1868 #define VUNSET 0x20 /* the variable is not set */
1869 #define VNOFUNC 0x40 /* don't call the callback function */
1870 #define VNOSET 0x80 /* do not set variable - just readonly test */
1871 #define VNOSAVE 0x100 /* when text is on the heap before setvareq */
1872 #if ENABLE_ASH_RANDOM_SUPPORT
1873 # define VDYNAMIC 0x200 /* dynamic variable */
1879 /* Need to be before varinit_data[] */
1880 #if ENABLE_LOCALE_SUPPORT
1881 static void FAST_FUNC
1882 change_lc_all(const char *value)
1884 if (value && *value != '\0')
1885 setlocale(LC_ALL, value);
1887 static void FAST_FUNC
1888 change_lc_ctype(const char *value)
1890 if (value && *value != '\0')
1891 setlocale(LC_CTYPE, value);
1895 static void chkmail(void);
1896 static void changemail(const char *var_value) FAST_FUNC;
1898 # define chkmail() ((void)0)
1900 static void changepath(const char *) FAST_FUNC;
1901 #if ENABLE_ASH_RANDOM_SUPPORT
1902 static void change_random(const char *) FAST_FUNC;
1905 static const struct {
1907 const char *var_text;
1908 void (*var_func)(const char *) FAST_FUNC;
1909 } varinit_data[] = {
1911 * Note: VEXPORT would not work correctly here for NOFORK applets:
1912 * some environment strings may be constant.
1914 { VSTRFIXED|VTEXTFIXED , defifsvar , NULL },
1916 { VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL" , changemail },
1917 { VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH" , changemail },
1919 { VSTRFIXED|VTEXTFIXED , bb_PATH_root_path, changepath },
1920 { VSTRFIXED|VTEXTFIXED , "PS1=$ " , NULL },
1921 { VSTRFIXED|VTEXTFIXED , "PS2=> " , NULL },
1922 { VSTRFIXED|VTEXTFIXED , "PS4=+ " , NULL },
1923 #if ENABLE_ASH_GETOPTS
1924 { VSTRFIXED|VTEXTFIXED , "OPTIND=1" , getoptsreset },
1926 #if ENABLE_ASH_RANDOM_SUPPORT
1927 { VSTRFIXED|VTEXTFIXED|VUNSET|VDYNAMIC, "RANDOM", change_random },
1929 #if ENABLE_LOCALE_SUPPORT
1930 { VSTRFIXED|VTEXTFIXED|VUNSET, "LC_ALL" , change_lc_all },
1931 { VSTRFIXED|VTEXTFIXED|VUNSET, "LC_CTYPE" , change_lc_ctype },
1933 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
1934 { VSTRFIXED|VTEXTFIXED|VUNSET, "HISTFILE" , NULL },
1940 struct globals_var {
1941 struct shparam shellparam; /* $@ current positional parameters */
1942 struct redirtab *redirlist;
1944 int preverrout_fd; /* save fd2 before print debug if xflag is set. */
1945 struct var *vartab[VTABSIZE];
1946 struct var varinit[ARRAY_SIZE(varinit_data)];
1948 extern struct globals_var *const ash_ptr_to_globals_var;
1949 #define G_var (*ash_ptr_to_globals_var)
1950 #define shellparam (G_var.shellparam )
1951 //#define redirlist (G_var.redirlist )
1952 #define g_nullredirs (G_var.g_nullredirs )
1953 #define preverrout_fd (G_var.preverrout_fd)
1954 #define vartab (G_var.vartab )
1955 #define varinit (G_var.varinit )
1956 #define INIT_G_var() do { \
1958 (*(struct globals_var**)&ash_ptr_to_globals_var) = xzalloc(sizeof(G_var)); \
1960 for (i = 0; i < ARRAY_SIZE(varinit_data); i++) { \
1961 varinit[i].flags = varinit_data[i].flags; \
1962 varinit[i].var_text = varinit_data[i].var_text; \
1963 varinit[i].var_func = varinit_data[i].var_func; \
1967 #define vifs varinit[0]
1969 # define vmail (&vifs)[1]
1970 # define vmpath (&vmail)[1]
1971 # define vpath (&vmpath)[1]
1973 # define vpath (&vifs)[1]
1975 #define vps1 (&vpath)[1]
1976 #define vps2 (&vps1)[1]
1977 #define vps4 (&vps2)[1]
1978 #if ENABLE_ASH_GETOPTS
1979 # define voptind (&vps4)[1]
1980 # if ENABLE_ASH_RANDOM_SUPPORT
1981 # define vrandom (&voptind)[1]
1984 # if ENABLE_ASH_RANDOM_SUPPORT
1985 # define vrandom (&vps4)[1]
1990 * The following macros access the values of the above variables.
1991 * They have to skip over the name. They return the null string
1992 * for unset variables.
1994 #define ifsval() (vifs.var_text + 4)
1995 #define ifsset() ((vifs.flags & VUNSET) == 0)
1997 # define mailval() (vmail.var_text + 5)
1998 # define mpathval() (vmpath.var_text + 9)
1999 # define mpathset() ((vmpath.flags & VUNSET) == 0)
2001 #define pathval() (vpath.var_text + 5)
2002 #define ps1val() (vps1.var_text + 4)
2003 #define ps2val() (vps2.var_text + 4)
2004 #define ps4val() (vps4.var_text + 4)
2005 #if ENABLE_ASH_GETOPTS
2006 # define optindval() (voptind.var_text + 7)
2009 #if ENABLE_ASH_GETOPTS
2010 static void FAST_FUNC
2011 getoptsreset(const char *value)
2013 shellparam.optind = number(value);
2014 shellparam.optoff = -1;
2019 * Compares two strings up to the first = or '\0'. The first
2020 * string must be terminated by '='; the second may be terminated by
2021 * either '=' or '\0'.
2024 varcmp(const char *p, const char *q)
2028 while ((c = *p) == (d = *q)) {
2029 if (c == '\0' || c == '=')
2043 * Find the appropriate entry in the hash table from the name.
2045 static struct var **
2046 hashvar(const char *p)
2050 hashval = ((unsigned char) *p) << 4;
2051 while (*p && *p != '=')
2052 hashval += (unsigned char) *p++;
2053 return &vartab[hashval % VTABSIZE];
2057 vpcmp(const void *a, const void *b)
2059 return varcmp(*(const char **)a, *(const char **)b);
2063 * This routine initializes the builtin variables.
2073 * PS1 depends on uid
2075 #if ENABLE_FEATURE_EDITING && ENABLE_FEATURE_EDITING_FANCY_PROMPT
2076 vps1.var_text = "PS1=\\w \\$ ";
2079 vps1.var_text = "PS1=# ";
2082 end = vp + ARRAY_SIZE(varinit);
2084 vpp = hashvar(vp->var_text);
2087 } while (++vp < end);
2090 static struct var **
2091 findvar(struct var **vpp, const char *name)
2093 for (; *vpp; vpp = &(*vpp)->next) {
2094 if (varcmp((*vpp)->var_text, name) == 0) {
2102 * Find the value of a variable. Returns NULL if not set.
2104 static const char* FAST_FUNC
2105 lookupvar(const char *name)
2109 v = *findvar(hashvar(name), name);
2111 #if ENABLE_ASH_RANDOM_SUPPORT
2113 * Dynamic variables are implemented roughly the same way they are
2114 * in bash. Namely, they're "special" so long as they aren't unset.
2115 * As soon as they're unset, they're no longer dynamic, and dynamic
2116 * lookup will no longer happen at that point. -- PFM.
2118 if (v->flags & VDYNAMIC)
2121 if (!(v->flags & VUNSET))
2122 return var_end(v->var_text);
2127 static void reinit_unicode_for_ash(void)
2129 /* Unicode support should be activated even if LANG is set
2130 * _during_ shell execution, not only if it was set when
2131 * shell was started. Therefore, re-check LANG every time:
2133 if (ENABLE_FEATURE_CHECK_UNICODE_IN_ENV
2134 || ENABLE_UNICODE_USING_LOCALE
2136 const char *s = lookupvar("LC_ALL");
2137 if (!s) s = lookupvar("LC_CTYPE");
2138 if (!s) s = lookupvar("LANG");
2144 * Search the environment of a builtin command.
2147 bltinlookup(const char *name)
2151 for (sp = cmdenviron; sp; sp = sp->next) {
2152 if (varcmp(sp->text, name) == 0)
2153 return var_end(sp->text);
2155 return lookupvar(name);
2159 * Same as setvar except that the variable and value are passed in
2160 * the first argument as name=value. Since the first argument will
2161 * be actually stored in the table, it should not be a string that
2163 * Called with interrupts off.
2166 setvareq(char *s, int flags)
2168 struct var *vp, **vpp;
2171 flags |= (VEXPORT & (((unsigned) (1 - aflag)) - 1));
2172 vp = *findvar(vpp, s);
2174 if ((vp->flags & (VREADONLY|VDYNAMIC)) == VREADONLY) {
2177 if (flags & VNOSAVE)
2180 ash_msg_and_raise_error("%.*s: is read only", strchrnul(n, '=') - n, n);
2186 if (vp->var_func && !(flags & VNOFUNC))
2187 vp->var_func(var_end(s));
2189 if (!(vp->flags & (VTEXTFIXED|VSTACK)))
2190 free((char*)vp->var_text);
2192 flags |= vp->flags & ~(VTEXTFIXED|VSTACK|VNOSAVE|VUNSET);
2194 /* variable s is not found */
2197 vp = ckzalloc(sizeof(*vp));
2199 /*vp->func = NULL; - ckzalloc did it */
2202 if (!(flags & (VTEXTFIXED|VSTACK|VNOSAVE)))
2209 * Set the value of a variable. The flags argument is ored with the
2210 * flags of the variable. If val is NULL, the variable is unset.
2213 setvar(const char *name, const char *val, int flags)
2221 q = endofname(name);
2222 p = strchrnul(q, '=');
2224 if (!namelen || p != q)
2225 ash_msg_and_raise_error("%.*s: bad variable name", namelen, name);
2230 vallen = strlen(val);
2234 nameeq = ckmalloc(namelen + vallen + 2);
2235 p = memcpy(nameeq, name, namelen) + namelen;
2238 p = memcpy(p, val, vallen) + vallen;
2241 setvareq(nameeq, flags | VNOSAVE);
2245 static void FAST_FUNC
2246 setvar0(const char *name, const char *val)
2248 setvar(name, val, 0);
2251 #if ENABLE_ASH_GETOPTS
2253 * Safe version of setvar, returns 1 on success 0 on failure.
2256 setvarsafe(const char *name, const char *val, int flags)
2259 volatile int saveint;
2260 struct jmploc *volatile savehandler = exception_handler;
2261 struct jmploc jmploc;
2264 if (setjmp(jmploc.loc))
2267 exception_handler = &jmploc;
2268 setvar(name, val, flags);
2271 exception_handler = savehandler;
2272 RESTORE_INT(saveint);
2278 * Unset the specified variable.
2281 unsetvar(const char *s)
2287 vpp = findvar(hashvar(s), s);
2291 int flags = vp->flags;
2294 if (flags & VREADONLY)
2296 #if ENABLE_ASH_RANDOM_SUPPORT
2297 vp->flags &= ~VDYNAMIC;
2301 if ((flags & VSTRFIXED) == 0) {
2303 if ((flags & (VTEXTFIXED|VSTACK)) == 0)
2304 free((char*)vp->var_text);
2310 vp->flags &= ~VEXPORT;
2320 * Process a linked list of variable assignments.
2323 listsetvar(struct strlist *list_set_var, int flags)
2325 struct strlist *lp = list_set_var;
2331 setvareq(lp->text, flags);
2338 * Generate a list of variables satisfying the given conditions.
2341 listvars(int on, int off, char ***end)
2352 for (vp = *vpp; vp; vp = vp->next) {
2353 if ((vp->flags & mask) == on) {
2354 if (ep == stackstrend())
2355 ep = growstackstr();
2356 *ep++ = (char*)vp->var_text;
2359 } while (++vpp < vartab + VTABSIZE);
2360 if (ep == stackstrend())
2361 ep = growstackstr();
2365 return grabstackstr(ep);
2369 /* ============ Path search helper
2371 * The variable path (passed by reference) should be set to the start
2372 * of the path before the first call; path_advance will update
2373 * this value as it proceeds. Successive calls to path_advance will return
2374 * the possible path expansions in sequence. If an option (indicated by
2375 * a percent sign) appears in the path entry then the global variable
2376 * pathopt will be set to point to it; otherwise pathopt will be set to
2379 static const char *pathopt; /* set by path_advance */
2382 path_advance(const char **path, const char *name)
2392 for (p = start; *p && *p != ':' && *p != '%'; p++)
2394 len = p - start + strlen(name) + 2; /* "2" is for '/' and '\0' */
2395 while (stackblocksize() < len)
2399 memcpy(q, start, p - start);
2407 while (*p && *p != ':')
2414 return stalloc(len);
2418 /* ============ Prompt */
2420 static smallint doprompt; /* if set, prompt the user */
2421 static smallint needprompt; /* true if interactive and at start of line */
2423 #if ENABLE_FEATURE_EDITING
2424 static line_input_t *line_input_state;
2425 static const char *cmdedit_prompt;
2427 putprompt(const char *s)
2429 if (ENABLE_ASH_EXPAND_PRMT) {
2430 free((char*)cmdedit_prompt);
2431 cmdedit_prompt = ckstrdup(s);
2438 putprompt(const char *s)
2444 #if ENABLE_ASH_EXPAND_PRMT
2445 /* expandstr() needs parsing machinery, so it is far away ahead... */
2446 static const char *expandstr(const char *ps);
2448 #define expandstr(s) s
2452 setprompt_if(smallint do_set, int whichprompt)
2455 IF_ASH_EXPAND_PRMT(struct stackmark smark;)
2462 switch (whichprompt) {
2472 #if ENABLE_ASH_EXPAND_PRMT
2473 setstackmark(&smark);
2474 stalloc(stackblocksize());
2476 putprompt(expandstr(prompt));
2477 #if ENABLE_ASH_EXPAND_PRMT
2478 popstackmark(&smark);
2483 /* ============ The cd and pwd commands */
2485 #define CD_PHYSICAL 1
2495 while ((i = nextopt("LP")) != '\0') {
2497 flags ^= CD_PHYSICAL;
2506 * Update curdir (the name of the current directory) in response to a
2510 updatepwd(const char *dir)
2517 cdcomppath = ststrdup(dir);
2520 if (curdir == nullstr)
2522 new = stack_putstr(curdir, new);
2524 new = makestrspace(strlen(dir) + 2, new);
2525 lim = (char *)stackblock() + 1;
2529 if (new > lim && *lim == '/')
2534 if (dir[1] == '/' && dir[2] != '/') {
2540 p = strtok(cdcomppath, "/");
2544 if (p[1] == '.' && p[2] == '\0') {
2556 new = stack_putstr(p, new);
2559 p = strtok(NULL, "/");
2564 return stackblock();
2568 * Find out what the current directory is. If we already know the current
2569 * directory, this routine returns immediately.
2574 char *dir = getcwd(NULL, 0); /* huh, using glibc extension? */
2575 return dir ? dir : nullstr;
2579 setpwd(const char *val, int setold)
2583 oldcur = dir = curdir;
2586 setvar("OLDPWD", oldcur, VEXPORT);
2589 if (physdir != nullstr) {
2590 if (physdir != oldcur)
2594 if (oldcur == val || !val) {
2600 dir = ckstrdup(val);
2601 if (oldcur != dir && oldcur != nullstr) {
2606 setvar("PWD", dir, VEXPORT);
2609 static void hashcd(void);
2612 * Actually do the chdir. We also call hashcd to let the routines in exec.c
2613 * know that the current directory has changed.
2616 docd(const char *dest, int flags)
2618 const char *dir = NULL;
2621 TRACE(("docd(\"%s\", %d) called\n", dest, flags));
2624 if (!(flags & CD_PHYSICAL)) {
2625 dir = updatepwd(dest);
2639 static int FAST_FUNC
2640 cdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
2652 dest = bltinlookup("HOME");
2653 else if (LONE_DASH(dest)) {
2654 dest = bltinlookup("OLDPWD");
2676 path = bltinlookup("CDPATH");
2685 p = path_advance(&path, dest);
2686 if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
2690 if (!docd(p, flags))
2695 ash_msg_and_raise_error("can't cd to %s", dest);
2698 if (flags & CD_PRINT)
2699 out1fmt("%s\n", curdir);
2703 static int FAST_FUNC
2704 pwdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
2707 const char *dir = curdir;
2711 if (physdir == nullstr)
2715 out1fmt("%s\n", dir);
2720 /* ============ ... */
2723 #define IBUFSIZ (ENABLE_FEATURE_EDITING ? CONFIG_FEATURE_EDITING_MAX_LEN : 1024)
2725 /* Syntax classes */
2726 #define CWORD 0 /* character is nothing special */
2727 #define CNL 1 /* newline character */
2728 #define CBACK 2 /* a backslash character */
2729 #define CSQUOTE 3 /* single quote */
2730 #define CDQUOTE 4 /* double quote */
2731 #define CENDQUOTE 5 /* a terminating quote */
2732 #define CBQUOTE 6 /* backwards single quote */
2733 #define CVAR 7 /* a dollar sign */
2734 #define CENDVAR 8 /* a '}' character */
2735 #define CLP 9 /* a left paren in arithmetic */
2736 #define CRP 10 /* a right paren in arithmetic */
2737 #define CENDFILE 11 /* end of file */
2738 #define CCTL 12 /* like CWORD, except it must be escaped */
2739 #define CSPCL 13 /* these terminate a word */
2740 #define CIGN 14 /* character should be ignored */
2743 #if ENABLE_ASH_ALIAS
2747 #define USE_SIT_FUNCTION ENABLE_ASH_OPTIMIZE_FOR_SIZE
2749 #if ENABLE_SH_MATH_SUPPORT
2750 # define SIT_ITEM(a,b,c,d) (a | (b << 4) | (c << 8) | (d << 12))
2752 # define SIT_ITEM(a,b,c,d) (a | (b << 4) | (c << 8))
2754 static const uint16_t S_I_T[] ALIGN2 = {
2755 #if ENABLE_ASH_ALIAS
2756 SIT_ITEM(CSPCL , CIGN , CIGN , CIGN ), /* 0, PEOA */
2758 SIT_ITEM(CSPCL , CWORD , CWORD, CWORD ), /* 1, ' ' */
2759 SIT_ITEM(CNL , CNL , CNL , CNL ), /* 2, \n */
2760 SIT_ITEM(CWORD , CCTL , CCTL , CWORD ), /* 3, !*-/:=?[]~ */
2761 SIT_ITEM(CDQUOTE , CENDQUOTE, CWORD, CWORD ), /* 4, '"' */
2762 SIT_ITEM(CVAR , CVAR , CWORD, CVAR ), /* 5, $ */
2763 SIT_ITEM(CSQUOTE , CWORD , CENDQUOTE, CWORD), /* 6, "'" */
2764 SIT_ITEM(CSPCL , CWORD , CWORD, CLP ), /* 7, ( */
2765 SIT_ITEM(CSPCL , CWORD , CWORD, CRP ), /* 8, ) */
2766 SIT_ITEM(CBACK , CBACK , CCTL , CBACK ), /* 9, \ */
2767 SIT_ITEM(CBQUOTE , CBQUOTE , CWORD, CBQUOTE), /* 10, ` */
2768 SIT_ITEM(CENDVAR , CENDVAR , CWORD, CENDVAR), /* 11, } */
2769 #if !USE_SIT_FUNCTION
2770 SIT_ITEM(CENDFILE, CENDFILE , CENDFILE, CENDFILE),/* 12, PEOF */
2771 SIT_ITEM(CWORD , CWORD , CWORD, CWORD ), /* 13, 0-9A-Za-z */
2772 SIT_ITEM(CCTL , CCTL , CCTL , CCTL ) /* 14, CTLESC ... */
2776 /* Constants below must match table above */
2778 #if ENABLE_ASH_ALIAS
2779 CSPCL_CIGN_CIGN_CIGN , /* 0 */
2781 CSPCL_CWORD_CWORD_CWORD , /* 1 */
2782 CNL_CNL_CNL_CNL , /* 2 */
2783 CWORD_CCTL_CCTL_CWORD , /* 3 */
2784 CDQUOTE_CENDQUOTE_CWORD_CWORD , /* 4 */
2785 CVAR_CVAR_CWORD_CVAR , /* 5 */
2786 CSQUOTE_CWORD_CENDQUOTE_CWORD , /* 6 */
2787 CSPCL_CWORD_CWORD_CLP , /* 7 */
2788 CSPCL_CWORD_CWORD_CRP , /* 8 */
2789 CBACK_CBACK_CCTL_CBACK , /* 9 */
2790 CBQUOTE_CBQUOTE_CWORD_CBQUOTE , /* 10 */
2791 CENDVAR_CENDVAR_CWORD_CENDVAR , /* 11 */
2792 CENDFILE_CENDFILE_CENDFILE_CENDFILE, /* 12 */
2793 CWORD_CWORD_CWORD_CWORD , /* 13 */
2794 CCTL_CCTL_CCTL_CCTL , /* 14 */
2797 /* c in SIT(c, syntax) must be an *unsigned char* or PEOA or PEOF,
2798 * caller must ensure proper cast on it if c is *char_ptr!
2800 /* Values for syntax param */
2801 #define BASESYNTAX 0 /* not in quotes */
2802 #define DQSYNTAX 1 /* in double quotes */
2803 #define SQSYNTAX 2 /* in single quotes */
2804 #define ARISYNTAX 3 /* in arithmetic */
2805 #define PSSYNTAX 4 /* prompt. never passed to SIT() */
2807 #if USE_SIT_FUNCTION
2810 SIT(int c, int syntax)
2812 /* Used to also have '/' in this string: "\t\n !\"$&'()*-/:;<=>?[\\]`|}~" */
2813 static const char spec_symbls[] ALIGN1 = "\t\n !\"$&'()*-:;<=>?[\\]`|}~";
2815 * This causes '/' to be prepended with CTLESC in dquoted string,
2816 * making "./file"* treated incorrectly because we feed
2817 * ".\/file*" string to glob(), confusing it (see expandmeta func).
2818 * The "homegrown" glob implementation is okay with that,
2819 * but glibc one isn't. With '/' always treated as CWORD,
2822 # if ENABLE_ASH_ALIAS
2823 static const uint8_t syntax_index_table[] ALIGN1 = {
2824 1, 2, 1, 3, 4, 5, 1, 6, /* "\t\n !\"$&'" */
2825 7, 8, 3, 3,/*3,*/3, 1, 1, /* "()*-/:;<" */
2826 3, 1, 3, 3, 9, 3, 10, 1, /* "=>?[\\]`|" */
2830 static const uint8_t syntax_index_table[] ALIGN1 = {
2831 0, 1, 0, 2, 3, 4, 0, 5, /* "\t\n !\"$&'" */
2832 6, 7, 2, 2,/*2,*/2, 0, 0, /* "()*-/:;<" */
2833 2, 0, 2, 2, 8, 2, 9, 0, /* "=>?[\\]`|" */
2842 # if ENABLE_ASH_ALIAS
2848 /* Cast is purely for paranoia here,
2849 * just in case someone passed signed char to us */
2850 if ((unsigned char)c >= CTL_FIRST
2851 && (unsigned char)c <= CTL_LAST
2855 s = strchrnul(spec_symbls, c);
2858 indx = syntax_index_table[s - spec_symbls];
2860 return (S_I_T[indx] >> (syntax*4)) & 0xf;
2863 #else /* !USE_SIT_FUNCTION */
2865 static const uint8_t syntax_index_table[] ALIGN1 = {
2866 /* BASESYNTAX_DQSYNTAX_SQSYNTAX_ARISYNTAX */
2867 /* 0 */ CWORD_CWORD_CWORD_CWORD,
2868 /* 1 */ CWORD_CWORD_CWORD_CWORD,
2869 /* 2 */ CWORD_CWORD_CWORD_CWORD,
2870 /* 3 */ CWORD_CWORD_CWORD_CWORD,
2871 /* 4 */ CWORD_CWORD_CWORD_CWORD,
2872 /* 5 */ CWORD_CWORD_CWORD_CWORD,
2873 /* 6 */ CWORD_CWORD_CWORD_CWORD,
2874 /* 7 */ CWORD_CWORD_CWORD_CWORD,
2875 /* 8 */ CWORD_CWORD_CWORD_CWORD,
2876 /* 9 "\t" */ CSPCL_CWORD_CWORD_CWORD,
2877 /* 10 "\n" */ CNL_CNL_CNL_CNL,
2878 /* 11 */ CWORD_CWORD_CWORD_CWORD,
2879 /* 12 */ CWORD_CWORD_CWORD_CWORD,
2880 /* 13 */ CWORD_CWORD_CWORD_CWORD,
2881 /* 14 */ CWORD_CWORD_CWORD_CWORD,
2882 /* 15 */ CWORD_CWORD_CWORD_CWORD,
2883 /* 16 */ CWORD_CWORD_CWORD_CWORD,
2884 /* 17 */ CWORD_CWORD_CWORD_CWORD,
2885 /* 18 */ CWORD_CWORD_CWORD_CWORD,
2886 /* 19 */ CWORD_CWORD_CWORD_CWORD,
2887 /* 20 */ CWORD_CWORD_CWORD_CWORD,
2888 /* 21 */ CWORD_CWORD_CWORD_CWORD,
2889 /* 22 */ CWORD_CWORD_CWORD_CWORD,
2890 /* 23 */ CWORD_CWORD_CWORD_CWORD,
2891 /* 24 */ CWORD_CWORD_CWORD_CWORD,
2892 /* 25 */ CWORD_CWORD_CWORD_CWORD,
2893 /* 26 */ CWORD_CWORD_CWORD_CWORD,
2894 /* 27 */ CWORD_CWORD_CWORD_CWORD,
2895 /* 28 */ CWORD_CWORD_CWORD_CWORD,
2896 /* 29 */ CWORD_CWORD_CWORD_CWORD,
2897 /* 30 */ CWORD_CWORD_CWORD_CWORD,
2898 /* 31 */ CWORD_CWORD_CWORD_CWORD,
2899 /* 32 " " */ CSPCL_CWORD_CWORD_CWORD,
2900 /* 33 "!" */ CWORD_CCTL_CCTL_CWORD,
2901 /* 34 """ */ CDQUOTE_CENDQUOTE_CWORD_CWORD,
2902 /* 35 "#" */ CWORD_CWORD_CWORD_CWORD,
2903 /* 36 "$" */ CVAR_CVAR_CWORD_CVAR,
2904 /* 37 "%" */ CWORD_CWORD_CWORD_CWORD,
2905 /* 38 "&" */ CSPCL_CWORD_CWORD_CWORD,
2906 /* 39 "'" */ CSQUOTE_CWORD_CENDQUOTE_CWORD,
2907 /* 40 "(" */ CSPCL_CWORD_CWORD_CLP,
2908 /* 41 ")" */ CSPCL_CWORD_CWORD_CRP,
2909 /* 42 "*" */ CWORD_CCTL_CCTL_CWORD,
2910 /* 43 "+" */ CWORD_CWORD_CWORD_CWORD,
2911 /* 44 "," */ CWORD_CWORD_CWORD_CWORD,
2912 /* 45 "-" */ CWORD_CCTL_CCTL_CWORD,
2913 /* 46 "." */ CWORD_CWORD_CWORD_CWORD,
2914 /* "/" was CWORD_CCTL_CCTL_CWORD, see comment in SIT() function why this is changed: */
2915 /* 47 "/" */ CWORD_CWORD_CWORD_CWORD,
2916 /* 48 "0" */ CWORD_CWORD_CWORD_CWORD,
2917 /* 49 "1" */ CWORD_CWORD_CWORD_CWORD,
2918 /* 50 "2" */ CWORD_CWORD_CWORD_CWORD,
2919 /* 51 "3" */ CWORD_CWORD_CWORD_CWORD,
2920 /* 52 "4" */ CWORD_CWORD_CWORD_CWORD,
2921 /* 53 "5" */ CWORD_CWORD_CWORD_CWORD,
2922 /* 54 "6" */ CWORD_CWORD_CWORD_CWORD,
2923 /* 55 "7" */ CWORD_CWORD_CWORD_CWORD,
2924 /* 56 "8" */ CWORD_CWORD_CWORD_CWORD,
2925 /* 57 "9" */ CWORD_CWORD_CWORD_CWORD,
2926 /* 58 ":" */ CWORD_CCTL_CCTL_CWORD,
2927 /* 59 ";" */ CSPCL_CWORD_CWORD_CWORD,
2928 /* 60 "<" */ CSPCL_CWORD_CWORD_CWORD,
2929 /* 61 "=" */ CWORD_CCTL_CCTL_CWORD,
2930 /* 62 ">" */ CSPCL_CWORD_CWORD_CWORD,
2931 /* 63 "?" */ CWORD_CCTL_CCTL_CWORD,
2932 /* 64 "@" */ CWORD_CWORD_CWORD_CWORD,
2933 /* 65 "A" */ CWORD_CWORD_CWORD_CWORD,
2934 /* 66 "B" */ CWORD_CWORD_CWORD_CWORD,
2935 /* 67 "C" */ CWORD_CWORD_CWORD_CWORD,
2936 /* 68 "D" */ CWORD_CWORD_CWORD_CWORD,
2937 /* 69 "E" */ CWORD_CWORD_CWORD_CWORD,
2938 /* 70 "F" */ CWORD_CWORD_CWORD_CWORD,
2939 /* 71 "G" */ CWORD_CWORD_CWORD_CWORD,
2940 /* 72 "H" */ CWORD_CWORD_CWORD_CWORD,
2941 /* 73 "I" */ CWORD_CWORD_CWORD_CWORD,
2942 /* 74 "J" */ CWORD_CWORD_CWORD_CWORD,
2943 /* 75 "K" */ CWORD_CWORD_CWORD_CWORD,
2944 /* 76 "L" */ CWORD_CWORD_CWORD_CWORD,
2945 /* 77 "M" */ CWORD_CWORD_CWORD_CWORD,
2946 /* 78 "N" */ CWORD_CWORD_CWORD_CWORD,
2947 /* 79 "O" */ CWORD_CWORD_CWORD_CWORD,
2948 /* 80 "P" */ CWORD_CWORD_CWORD_CWORD,
2949 /* 81 "Q" */ CWORD_CWORD_CWORD_CWORD,
2950 /* 82 "R" */ CWORD_CWORD_CWORD_CWORD,
2951 /* 83 "S" */ CWORD_CWORD_CWORD_CWORD,
2952 /* 84 "T" */ CWORD_CWORD_CWORD_CWORD,
2953 /* 85 "U" */ CWORD_CWORD_CWORD_CWORD,
2954 /* 86 "V" */ CWORD_CWORD_CWORD_CWORD,
2955 /* 87 "W" */ CWORD_CWORD_CWORD_CWORD,
2956 /* 88 "X" */ CWORD_CWORD_CWORD_CWORD,
2957 /* 89 "Y" */ CWORD_CWORD_CWORD_CWORD,
2958 /* 90 "Z" */ CWORD_CWORD_CWORD_CWORD,
2959 /* 91 "[" */ CWORD_CCTL_CCTL_CWORD,
2960 /* 92 "\" */ CBACK_CBACK_CCTL_CBACK,
2961 /* 93 "]" */ CWORD_CCTL_CCTL_CWORD,
2962 /* 94 "^" */ CWORD_CWORD_CWORD_CWORD,
2963 /* 95 "_" */ CWORD_CWORD_CWORD_CWORD,
2964 /* 96 "`" */ CBQUOTE_CBQUOTE_CWORD_CBQUOTE,
2965 /* 97 "a" */ CWORD_CWORD_CWORD_CWORD,
2966 /* 98 "b" */ CWORD_CWORD_CWORD_CWORD,
2967 /* 99 "c" */ CWORD_CWORD_CWORD_CWORD,
2968 /* 100 "d" */ CWORD_CWORD_CWORD_CWORD,
2969 /* 101 "e" */ CWORD_CWORD_CWORD_CWORD,
2970 /* 102 "f" */ CWORD_CWORD_CWORD_CWORD,
2971 /* 103 "g" */ CWORD_CWORD_CWORD_CWORD,
2972 /* 104 "h" */ CWORD_CWORD_CWORD_CWORD,
2973 /* 105 "i" */ CWORD_CWORD_CWORD_CWORD,
2974 /* 106 "j" */ CWORD_CWORD_CWORD_CWORD,
2975 /* 107 "k" */ CWORD_CWORD_CWORD_CWORD,
2976 /* 108 "l" */ CWORD_CWORD_CWORD_CWORD,
2977 /* 109 "m" */ CWORD_CWORD_CWORD_CWORD,
2978 /* 110 "n" */ CWORD_CWORD_CWORD_CWORD,
2979 /* 111 "o" */ CWORD_CWORD_CWORD_CWORD,
2980 /* 112 "p" */ CWORD_CWORD_CWORD_CWORD,
2981 /* 113 "q" */ CWORD_CWORD_CWORD_CWORD,
2982 /* 114 "r" */ CWORD_CWORD_CWORD_CWORD,
2983 /* 115 "s" */ CWORD_CWORD_CWORD_CWORD,
2984 /* 116 "t" */ CWORD_CWORD_CWORD_CWORD,
2985 /* 117 "u" */ CWORD_CWORD_CWORD_CWORD,
2986 /* 118 "v" */ CWORD_CWORD_CWORD_CWORD,
2987 /* 119 "w" */ CWORD_CWORD_CWORD_CWORD,
2988 /* 120 "x" */ CWORD_CWORD_CWORD_CWORD,
2989 /* 121 "y" */ CWORD_CWORD_CWORD_CWORD,
2990 /* 122 "z" */ CWORD_CWORD_CWORD_CWORD,
2991 /* 123 "{" */ CWORD_CWORD_CWORD_CWORD,
2992 /* 124 "|" */ CSPCL_CWORD_CWORD_CWORD,
2993 /* 125 "}" */ CENDVAR_CENDVAR_CWORD_CENDVAR,
2994 /* 126 "~" */ CWORD_CCTL_CCTL_CWORD,
2995 /* 127 del */ CWORD_CWORD_CWORD_CWORD,
2996 /* 128 0x80 */ CWORD_CWORD_CWORD_CWORD,
2997 /* 129 CTLESC */ CCTL_CCTL_CCTL_CCTL,
2998 /* 130 CTLVAR */ CCTL_CCTL_CCTL_CCTL,
2999 /* 131 CTLENDVAR */ CCTL_CCTL_CCTL_CCTL,
3000 /* 132 CTLBACKQ */ CCTL_CCTL_CCTL_CCTL,
3001 /* 133 CTLQUOTE */ CCTL_CCTL_CCTL_CCTL,
3002 /* 134 CTLARI */ CCTL_CCTL_CCTL_CCTL,
3003 /* 135 CTLENDARI */ CCTL_CCTL_CCTL_CCTL,
3004 /* 136 CTLQUOTEMARK */ CCTL_CCTL_CCTL_CCTL,
3005 /* 137 */ CWORD_CWORD_CWORD_CWORD,
3006 /* 138 */ CWORD_CWORD_CWORD_CWORD,
3007 /* 139 */ CWORD_CWORD_CWORD_CWORD,
3008 /* 140 */ CWORD_CWORD_CWORD_CWORD,
3009 /* 141 */ CWORD_CWORD_CWORD_CWORD,
3010 /* 142 */ CWORD_CWORD_CWORD_CWORD,
3011 /* 143 */ CWORD_CWORD_CWORD_CWORD,
3012 /* 144 */ CWORD_CWORD_CWORD_CWORD,
3013 /* 145 */ CWORD_CWORD_CWORD_CWORD,
3014 /* 146 */ CWORD_CWORD_CWORD_CWORD,
3015 /* 147 */ CWORD_CWORD_CWORD_CWORD,
3016 /* 148 */ CWORD_CWORD_CWORD_CWORD,
3017 /* 149 */ CWORD_CWORD_CWORD_CWORD,
3018 /* 150 */ CWORD_CWORD_CWORD_CWORD,
3019 /* 151 */ CWORD_CWORD_CWORD_CWORD,
3020 /* 152 */ CWORD_CWORD_CWORD_CWORD,
3021 /* 153 */ CWORD_CWORD_CWORD_CWORD,
3022 /* 154 */ CWORD_CWORD_CWORD_CWORD,
3023 /* 155 */ CWORD_CWORD_CWORD_CWORD,
3024 /* 156 */ CWORD_CWORD_CWORD_CWORD,
3025 /* 157 */ CWORD_CWORD_CWORD_CWORD,
3026 /* 158 */ CWORD_CWORD_CWORD_CWORD,
3027 /* 159 */ CWORD_CWORD_CWORD_CWORD,
3028 /* 160 */ CWORD_CWORD_CWORD_CWORD,
3029 /* 161 */ CWORD_CWORD_CWORD_CWORD,
3030 /* 162 */ CWORD_CWORD_CWORD_CWORD,
3031 /* 163 */ CWORD_CWORD_CWORD_CWORD,
3032 /* 164 */ CWORD_CWORD_CWORD_CWORD,
3033 /* 165 */ CWORD_CWORD_CWORD_CWORD,
3034 /* 166 */ CWORD_CWORD_CWORD_CWORD,
3035 /* 167 */ CWORD_CWORD_CWORD_CWORD,
3036 /* 168 */ CWORD_CWORD_CWORD_CWORD,
3037 /* 169 */ CWORD_CWORD_CWORD_CWORD,
3038 /* 170 */ CWORD_CWORD_CWORD_CWORD,
3039 /* 171 */ CWORD_CWORD_CWORD_CWORD,
3040 /* 172 */ CWORD_CWORD_CWORD_CWORD,
3041 /* 173 */ CWORD_CWORD_CWORD_CWORD,
3042 /* 174 */ CWORD_CWORD_CWORD_CWORD,
3043 /* 175 */ CWORD_CWORD_CWORD_CWORD,
3044 /* 176 */ CWORD_CWORD_CWORD_CWORD,
3045 /* 177 */ CWORD_CWORD_CWORD_CWORD,
3046 /* 178 */ CWORD_CWORD_CWORD_CWORD,
3047 /* 179 */ CWORD_CWORD_CWORD_CWORD,
3048 /* 180 */ CWORD_CWORD_CWORD_CWORD,
3049 /* 181 */ CWORD_CWORD_CWORD_CWORD,
3050 /* 182 */ CWORD_CWORD_CWORD_CWORD,
3051 /* 183 */ CWORD_CWORD_CWORD_CWORD,
3052 /* 184 */ CWORD_CWORD_CWORD_CWORD,
3053 /* 185 */ CWORD_CWORD_CWORD_CWORD,
3054 /* 186 */ CWORD_CWORD_CWORD_CWORD,
3055 /* 187 */ CWORD_CWORD_CWORD_CWORD,
3056 /* 188 */ CWORD_CWORD_CWORD_CWORD,
3057 /* 189 */ CWORD_CWORD_CWORD_CWORD,
3058 /* 190 */ CWORD_CWORD_CWORD_CWORD,
3059 /* 191 */ CWORD_CWORD_CWORD_CWORD,
3060 /* 192 */ CWORD_CWORD_CWORD_CWORD,
3061 /* 193 */ CWORD_CWORD_CWORD_CWORD,
3062 /* 194 */ CWORD_CWORD_CWORD_CWORD,
3063 /* 195 */ CWORD_CWORD_CWORD_CWORD,
3064 /* 196 */ CWORD_CWORD_CWORD_CWORD,
3065 /* 197 */ CWORD_CWORD_CWORD_CWORD,
3066 /* 198 */ CWORD_CWORD_CWORD_CWORD,
3067 /* 199 */ CWORD_CWORD_CWORD_CWORD,
3068 /* 200 */ CWORD_CWORD_CWORD_CWORD,
3069 /* 201 */ CWORD_CWORD_CWORD_CWORD,
3070 /* 202 */ CWORD_CWORD_CWORD_CWORD,
3071 /* 203 */ CWORD_CWORD_CWORD_CWORD,
3072 /* 204 */ CWORD_CWORD_CWORD_CWORD,
3073 /* 205 */ CWORD_CWORD_CWORD_CWORD,
3074 /* 206 */ CWORD_CWORD_CWORD_CWORD,
3075 /* 207 */ CWORD_CWORD_CWORD_CWORD,
3076 /* 208 */ CWORD_CWORD_CWORD_CWORD,
3077 /* 209 */ CWORD_CWORD_CWORD_CWORD,
3078 /* 210 */ CWORD_CWORD_CWORD_CWORD,
3079 /* 211 */ CWORD_CWORD_CWORD_CWORD,
3080 /* 212 */ CWORD_CWORD_CWORD_CWORD,
3081 /* 213 */ CWORD_CWORD_CWORD_CWORD,
3082 /* 214 */ CWORD_CWORD_CWORD_CWORD,
3083 /* 215 */ CWORD_CWORD_CWORD_CWORD,
3084 /* 216 */ CWORD_CWORD_CWORD_CWORD,
3085 /* 217 */ CWORD_CWORD_CWORD_CWORD,
3086 /* 218 */ CWORD_CWORD_CWORD_CWORD,
3087 /* 219 */ CWORD_CWORD_CWORD_CWORD,
3088 /* 220 */ CWORD_CWORD_CWORD_CWORD,
3089 /* 221 */ CWORD_CWORD_CWORD_CWORD,
3090 /* 222 */ CWORD_CWORD_CWORD_CWORD,
3091 /* 223 */ CWORD_CWORD_CWORD_CWORD,
3092 /* 224 */ CWORD_CWORD_CWORD_CWORD,
3093 /* 225 */ CWORD_CWORD_CWORD_CWORD,
3094 /* 226 */ CWORD_CWORD_CWORD_CWORD,
3095 /* 227 */ CWORD_CWORD_CWORD_CWORD,
3096 /* 228 */ CWORD_CWORD_CWORD_CWORD,
3097 /* 229 */ CWORD_CWORD_CWORD_CWORD,
3098 /* 230 */ CWORD_CWORD_CWORD_CWORD,
3099 /* 231 */ CWORD_CWORD_CWORD_CWORD,
3100 /* 232 */ CWORD_CWORD_CWORD_CWORD,
3101 /* 233 */ CWORD_CWORD_CWORD_CWORD,
3102 /* 234 */ CWORD_CWORD_CWORD_CWORD,
3103 /* 235 */ CWORD_CWORD_CWORD_CWORD,
3104 /* 236 */ CWORD_CWORD_CWORD_CWORD,
3105 /* 237 */ CWORD_CWORD_CWORD_CWORD,
3106 /* 238 */ CWORD_CWORD_CWORD_CWORD,
3107 /* 239 */ CWORD_CWORD_CWORD_CWORD,
3108 /* 230 */ CWORD_CWORD_CWORD_CWORD,
3109 /* 241 */ CWORD_CWORD_CWORD_CWORD,
3110 /* 242 */ CWORD_CWORD_CWORD_CWORD,
3111 /* 243 */ CWORD_CWORD_CWORD_CWORD,
3112 /* 244 */ CWORD_CWORD_CWORD_CWORD,
3113 /* 245 */ CWORD_CWORD_CWORD_CWORD,
3114 /* 246 */ CWORD_CWORD_CWORD_CWORD,
3115 /* 247 */ CWORD_CWORD_CWORD_CWORD,
3116 /* 248 */ CWORD_CWORD_CWORD_CWORD,
3117 /* 249 */ CWORD_CWORD_CWORD_CWORD,
3118 /* 250 */ CWORD_CWORD_CWORD_CWORD,
3119 /* 251 */ CWORD_CWORD_CWORD_CWORD,
3120 /* 252 */ CWORD_CWORD_CWORD_CWORD,
3121 /* 253 */ CWORD_CWORD_CWORD_CWORD,
3122 /* 254 */ CWORD_CWORD_CWORD_CWORD,
3123 /* 255 */ CWORD_CWORD_CWORD_CWORD,
3124 /* PEOF */ CENDFILE_CENDFILE_CENDFILE_CENDFILE,
3125 # if ENABLE_ASH_ALIAS
3126 /* PEOA */ CSPCL_CIGN_CIGN_CIGN,
3130 # define SIT(c, syntax) ((S_I_T[syntax_index_table[c]] >> ((syntax)*4)) & 0xf)
3132 #endif /* !USE_SIT_FUNCTION */
3135 /* ============ Alias handling */
3137 #if ENABLE_ASH_ALIAS
3139 #define ALIASINUSE 1
3150 static struct alias **atab; // [ATABSIZE];
3151 #define INIT_G_alias() do { \
3152 atab = xzalloc(ATABSIZE * sizeof(atab[0])); \
3156 static struct alias **
3157 __lookupalias(const char *name) {
3158 unsigned int hashval;
3165 ch = (unsigned char)*p;
3169 ch = (unsigned char)*++p;
3171 app = &atab[hashval % ATABSIZE];
3173 for (; *app; app = &(*app)->next) {
3174 if (strcmp(name, (*app)->name) == 0) {
3182 static struct alias *
3183 lookupalias(const char *name, int check)
3185 struct alias *ap = *__lookupalias(name);
3187 if (check && ap && (ap->flag & ALIASINUSE))
3192 static struct alias *
3193 freealias(struct alias *ap)
3197 if (ap->flag & ALIASINUSE) {
3198 ap->flag |= ALIASDEAD;
3210 setalias(const char *name, const char *val)
3212 struct alias *ap, **app;
3214 app = __lookupalias(name);
3218 if (!(ap->flag & ALIASINUSE)) {
3221 ap->val = ckstrdup(val);
3222 ap->flag &= ~ALIASDEAD;
3225 ap = ckzalloc(sizeof(struct alias));
3226 ap->name = ckstrdup(name);
3227 ap->val = ckstrdup(val);
3228 /*ap->flag = 0; - ckzalloc did it */
3229 /*ap->next = NULL;*/
3236 unalias(const char *name)
3240 app = __lookupalias(name);
3244 *app = freealias(*app);
3255 struct alias *ap, **app;
3259 for (i = 0; i < ATABSIZE; i++) {
3261 for (ap = *app; ap; ap = *app) {
3262 *app = freealias(*app);
3272 printalias(const struct alias *ap)
3274 out1fmt("%s=%s\n", ap->name, single_quote(ap->val));
3278 * TODO - sort output
3280 static int FAST_FUNC
3281 aliascmd(int argc UNUSED_PARAM, char **argv)
3290 for (i = 0; i < ATABSIZE; i++) {
3291 for (ap = atab[i]; ap; ap = ap->next) {
3297 while ((n = *++argv) != NULL) {
3298 v = strchr(n+1, '=');
3299 if (v == NULL) { /* n+1: funny ksh stuff */
3300 ap = *__lookupalias(n);
3302 fprintf(stderr, "%s: %s not found\n", "alias", n);
3315 static int FAST_FUNC
3316 unaliascmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
3320 while ((i = nextopt("a")) != '\0') {
3326 for (i = 0; *argptr; argptr++) {
3327 if (unalias(*argptr)) {
3328 fprintf(stderr, "%s: %s not found\n", "unalias", *argptr);
3336 #endif /* ASH_ALIAS */
3339 /* ============ jobs.c */
3341 /* Mode argument to forkshell. Don't change FORK_FG or FORK_BG. */
3344 #define FORK_NOJOB 2
3346 /* mode flags for showjob(s) */
3347 #define SHOW_ONLY_PGID 0x01 /* show only pgid (jobs -p) */
3348 #define SHOW_PIDS 0x02 /* show individual pids, not just one line per job */
3349 #define SHOW_CHANGED 0x04 /* only jobs whose state has changed */
3350 #define SHOW_STDERR 0x08 /* print to stderr (else stdout) */
3353 * A job structure contains information about a job. A job is either a
3354 * single process or a set of processes contained in a pipeline. In the
3355 * latter case, pidlist will be non-NULL, and will point to a -1 terminated
3359 pid_t ps_pid; /* process id */
3360 int ps_status; /* last process status from wait() */
3361 char *ps_cmd; /* text of command being run */
3365 struct procstat ps0; /* status of process */
3366 struct procstat *ps; /* status or processes when more than one */
3368 int stopstatus; /* status of a stopped job */
3371 nprocs: 16, /* number of processes */
3373 #define JOBRUNNING 0 /* at least one proc running */
3374 #define JOBSTOPPED 1 /* all procs are stopped */
3375 #define JOBDONE 2 /* all procs are completed */
3377 sigint: 1, /* job was killed by SIGINT */
3378 jobctl: 1, /* job running under job control */
3380 waited: 1, /* true if this entry has been waited for */
3381 used: 1, /* true if this entry is in used */
3382 changed: 1; /* true if status has changed */
3383 struct job *prev_job; /* previous job */
3386 static struct job *makejob(/*union node *,*/ int);
3387 static int forkshell(struct job *, union node *, int);
3388 static int waitforjob(struct job *);
3391 enum { doing_jobctl = 0 };
3392 #define setjobctl(on) do {} while (0)
3394 static smallint doing_jobctl; //references:8
3395 static void setjobctl(int);
3402 ignoresig(int signo)
3404 /* Avoid unnecessary system calls. Is it already SIG_IGNed? */
3405 if (sigmode[signo - 1] != S_IGN && sigmode[signo - 1] != S_HARD_IGN) {
3406 /* No, need to do it */
3407 signal(signo, SIG_IGN);
3409 sigmode[signo - 1] = S_HARD_IGN;
3413 * Only one usage site - in setsignal()
3416 signal_handler(int signo)
3418 gotsig[signo - 1] = 1;
3420 if (signo == SIGINT && !trap[SIGINT]) {
3421 if (!suppress_int) {
3423 raise_interrupt(); /* does not return */
3427 pending_sig = signo;
3432 * Set the signal handler for the specified signal. The routine figures
3433 * out what it should be set to.
3436 setsignal(int signo)
3439 char cur_act, new_act;
3440 struct sigaction act;
3444 if (t != NULL) { /* trap for this sig is set */
3446 if (t[0] == '\0') /* trap is "": ignore this sig */
3450 if (rootshell && new_act == S_DFL) {
3453 if (iflag || minusc || sflag == 0)
3462 * "In all cases, bash ignores SIGQUIT. Non-builtin
3463 * commands run by bash have signal handlers
3464 * set to the values inherited by the shell
3465 * from its parent". */
3481 //TODO: if !rootshell, we reset SIGQUIT to DFL,
3482 //whereas we have to restore it to what shell got on entry
3483 //from the parent. See comment above
3485 t = &sigmode[signo - 1];
3488 /* current setting is not yet known */
3489 if (sigaction(signo, NULL, &act)) {
3490 /* pretend it worked; maybe we should give a warning,
3491 * but other shells don't. We don't alter sigmode,
3492 * so we retry every time.
3493 * btw, in Linux it never fails. --vda */
3496 if (act.sa_handler == SIG_IGN) {
3497 cur_act = S_HARD_IGN;
3499 && (signo == SIGTSTP || signo == SIGTTIN || signo == SIGTTOU)
3501 cur_act = S_IGN; /* don't hard ignore these */
3505 if (cur_act == S_HARD_IGN || cur_act == new_act)
3508 act.sa_handler = SIG_DFL;
3511 act.sa_handler = signal_handler;
3514 act.sa_handler = SIG_IGN;
3518 /* flags and mask matter only if !DFL and !IGN, but we do it
3519 * for all cases for more deterministic behavior:
3522 sigfillset(&act.sa_mask);
3524 sigaction_set(signo, &act);
3529 /* mode flags for set_curjob */
3530 #define CUR_DELETE 2
3531 #define CUR_RUNNING 1
3532 #define CUR_STOPPED 0
3534 /* mode flags for dowait */
3535 #define DOWAIT_NONBLOCK WNOHANG
3536 #define DOWAIT_BLOCK 0
3539 /* pgrp of shell on invocation */
3540 static int initialpgrp; //references:2
3541 static int ttyfd = -1; //5
3544 static struct job *jobtab; //5
3546 static unsigned njobs; //4
3548 static struct job *curjob; //lots
3549 /* number of presumed living untracked jobs */
3550 static int jobless; //4
3553 set_curjob(struct job *jp, unsigned mode)
3556 struct job **jpp, **curp;
3558 /* first remove from list */
3559 jpp = curp = &curjob;
3564 jpp = &jp1->prev_job;
3566 *jpp = jp1->prev_job;
3568 /* Then re-insert in correct position */
3576 /* job being deleted */
3579 /* newly created job or backgrounded job,
3580 * put after all stopped jobs.
3585 if (!jp1 || jp1->state != JOBSTOPPED)
3588 jpp = &jp1->prev_job;
3594 /* newly stopped job - becomes curjob */
3595 jp->prev_job = *jpp;
3603 jobno(const struct job *jp)
3605 return jp - jobtab + 1;
3610 * Convert a job name to a job structure.
3613 #define getjob(name, getctl) getjob(name)
3616 getjob(const char *name, int getctl)
3620 const char *err_msg = "%s: no such job";
3624 char *(*match)(const char *, const char *);
3639 if (c == '+' || c == '%') {
3641 err_msg = "No current job";
3647 err_msg = "No previous job";
3658 jp = jobtab + num - 1;
3673 if (match(jp->ps[0].ps_cmd, p)) {
3677 err_msg = "%s: ambiguous";
3687 err_msg = "job %s not created under job control";
3688 if (getctl && jp->jobctl == 0)
3693 ash_msg_and_raise_error(err_msg, name);
3697 * Mark a job structure as unused.
3700 freejob(struct job *jp)
3702 struct procstat *ps;
3706 for (i = jp->nprocs, ps = jp->ps; --i >= 0; ps++) {
3707 if (ps->ps_cmd != nullstr)
3710 if (jp->ps != &jp->ps0)
3713 set_curjob(jp, CUR_DELETE);
3719 xtcsetpgrp(int fd, pid_t pgrp)
3721 if (tcsetpgrp(fd, pgrp))
3722 ash_msg_and_raise_error("can't set tty process group (%m)");
3726 * Turn job control on and off.
3728 * Note: This code assumes that the third arg to ioctl is a character
3729 * pointer, which is true on Berkeley systems but not System V. Since
3730 * System V doesn't have job control yet, this isn't a problem now.
3732 * Called with interrupts off.
3740 if (on == doing_jobctl || rootshell == 0)
3744 ofd = fd = open(_PATH_TTY, O_RDWR);
3746 /* BTW, bash will try to open(ttyname(0)) if open("/dev/tty") fails.
3747 * That sometimes helps to acquire controlling tty.
3748 * Obviously, a workaround for bugs when someone
3749 * failed to provide a controlling tty to bash! :) */
3755 fd = fcntl(fd, F_DUPFD, 10);
3760 /* fd is a tty at this point */
3761 close_on_exec_on(fd);
3762 while (1) { /* while we are in the background */
3763 pgrp = tcgetpgrp(fd);
3766 ash_msg("can't access tty; job control turned off");
3770 if (pgrp == getpgrp())
3781 xtcsetpgrp(fd, pgrp);
3783 /* turning job control off */
3786 /* was xtcsetpgrp, but this can make exiting ash
3787 * loop forever if pty is already deleted */
3788 tcsetpgrp(fd, pgrp);
3802 static int FAST_FUNC
3803 killcmd(int argc, char **argv)
3805 if (argv[1] && strcmp(argv[1], "-l") != 0) {
3808 if (argv[i][0] == '%') {
3810 * "kill %N" - job kill
3811 * Converting to pgrp / pid kill
3817 jp = getjob(argv[i], 0);
3819 * In jobs started under job control, we signal
3820 * entire process group by kill -PGRP_ID.
3821 * This happens, f.e., in interactive shell.
3823 * Otherwise, we signal each child via
3824 * kill PID1 PID2 PID3.
3826 * sh -c 'sleep 1|sleep 1 & kill %1'
3827 * sh -c 'true|sleep 2 & sleep 1; kill %1'
3828 * sh -c 'true|sleep 1 & sleep 2; kill %1'
3830 n = jp->nprocs; /* can't be 0 (I hope) */
3833 dst = alloca(n * sizeof(int)*4);
3835 for (j = 0; j < n; j++) {
3836 struct procstat *ps = &jp->ps[j];
3837 /* Skip non-running and not-stopped members
3838 * (i.e. dead members) of the job
3840 if (ps->ps_status != -1 && !WIFSTOPPED(ps->ps_status))
3843 * kill_main has matching code to expect
3844 * leading space. Needed to not confuse
3845 * negative pids with "kill -SIGNAL_NO" syntax
3847 dst += sprintf(dst, jp->jobctl ? " -%u" : " %u", (int)ps->ps_pid);
3851 } while (argv[++i]);
3853 return kill_main(argc, argv);
3857 showpipe(struct job *jp /*, FILE *out*/)
3859 struct procstat *ps;
3860 struct procstat *psend;
3862 psend = jp->ps + jp->nprocs;
3863 for (ps = jp->ps + 1; ps < psend; ps++)
3864 printf(" | %s", ps->ps_cmd);
3865 newline_and_flush(stdout);
3866 flush_stdout_stderr();
3871 restartjob(struct job *jp, int mode)
3873 struct procstat *ps;
3879 if (jp->state == JOBDONE)
3881 jp->state = JOBRUNNING;
3882 pgid = jp->ps[0].ps_pid;
3883 if (mode == FORK_FG)
3884 xtcsetpgrp(ttyfd, pgid);
3885 killpg(pgid, SIGCONT);
3889 if (WIFSTOPPED(ps->ps_status)) {
3895 status = (mode == FORK_FG) ? waitforjob(jp) : 0;
3900 static int FAST_FUNC
3901 fg_bgcmd(int argc UNUSED_PARAM, char **argv)
3907 mode = (**argv == 'f') ? FORK_FG : FORK_BG;
3911 jp = getjob(*argv, 1);
3912 if (mode == FORK_BG) {
3913 set_curjob(jp, CUR_RUNNING);
3914 printf("[%d] ", jobno(jp));
3916 out1str(jp->ps[0].ps_cmd);
3917 showpipe(jp /*, stdout*/);
3918 retval = restartjob(jp, mode);
3919 } while (*argv && *++argv);
3925 sprint_status48(char *s, int status, int sigonly)
3931 if (!WIFEXITED(status)) {
3932 if (JOBS && WIFSTOPPED(status))
3933 st = WSTOPSIG(status);
3935 st = WTERMSIG(status);
3937 if (st == SIGINT || st == SIGPIPE)
3939 if (JOBS && WIFSTOPPED(status))
3943 //TODO: use bbox's get_signame? strsignal adds ~600 bytes to text+rodata
3944 col = fmtstr(s, 32, strsignal(st));
3945 if (WCOREDUMP(status)) {
3946 strcpy(s + col, " (core dumped)");
3947 col += sizeof(" (core dumped)")-1;
3949 } else if (!sigonly) {
3950 st = WEXITSTATUS(status);
3951 col = fmtstr(s, 16, (st ? "Done(%d)" : "Done"), st);
3958 dowait(int wait_flags, struct job *job)
3963 struct job *thisjob;
3965 TRACE(("dowait(0x%x) called\n", wait_flags));
3967 /* Do a wait system call. If job control is compiled in, we accept
3968 * stopped processes. wait_flags may have WNOHANG, preventing blocking.
3969 * NB: _not_ safe_waitpid, we need to detect EINTR */
3971 wait_flags |= WUNTRACED;
3972 pid = waitpid(-1, &status, wait_flags);
3973 TRACE(("wait returns pid=%d, status=0x%x, errno=%d(%s)\n",
3974 pid, status, errno, strerror(errno)));
3980 for (jp = curjob; jp; jp = jp->prev_job) {
3982 struct procstat *ps;
3983 struct procstat *psend;
3984 if (jp->state == JOBDONE)
3988 psend = ps + jp->nprocs;
3990 if (ps->ps_pid == pid) {
3991 TRACE(("Job %d: changing status of proc %d "
3992 "from 0x%x to 0x%x\n",
3993 jobno(jp), pid, ps->ps_status, status));
3994 ps->ps_status = status;
3997 if (ps->ps_status == -1)
3998 jobstate = JOBRUNNING;
4000 if (jobstate == JOBRUNNING)
4002 if (WIFSTOPPED(ps->ps_status)) {
4003 jp->stopstatus = ps->ps_status;
4004 jobstate = JOBSTOPPED;
4007 } while (++ps < psend);
4011 /* Found the job where one of its processes changed its state.
4012 * Is there at least one live and running process in this job? */
4013 if (jobstate != JOBRUNNING) {
4014 /* No. All live processes in the job are stopped
4015 * (JOBSTOPPED) or there are no live processes (JOBDONE)
4017 thisjob->changed = 1;
4018 if (thisjob->state != jobstate) {
4019 TRACE(("Job %d: changing state from %d to %d\n",
4020 jobno(thisjob), thisjob->state, jobstate));
4021 thisjob->state = jobstate;
4023 if (jobstate == JOBSTOPPED)
4024 set_curjob(thisjob, CUR_STOPPED);
4030 /* The process wasn't found in job list */
4031 if (JOBS && !WIFSTOPPED(status))
4036 if (thisjob && thisjob == job) {
4040 len = sprint_status48(s, status, 1);
4051 blocking_wait_with_raise_on_sig(void)
4053 pid_t pid = dowait(DOWAIT_BLOCK, NULL);
4054 if (pid <= 0 && pending_sig)
4055 raise_exception(EXSIG);
4061 showjob(struct job *jp, int mode)
4063 struct procstat *ps;
4064 struct procstat *psend;
4067 char s[16 + 16 + 48];
4068 FILE *out = (mode & SHOW_STDERR ? stderr : stdout);
4072 if (mode & SHOW_ONLY_PGID) { /* jobs -p */
4073 /* just output process (group) id of pipeline */
4074 fprintf(out, "%d\n", ps->ps_pid);
4078 col = fmtstr(s, 16, "[%d] ", jobno(jp));
4083 else if (curjob && jp == curjob->prev_job)
4086 if (mode & SHOW_PIDS)
4087 col += fmtstr(s + col, 16, "%d ", ps->ps_pid);
4089 psend = ps + jp->nprocs;
4091 if (jp->state == JOBRUNNING) {
4092 strcpy(s + col, "Running");
4093 col += sizeof("Running") - 1;
4095 int status = psend[-1].ps_status;
4096 if (jp->state == JOBSTOPPED)
4097 status = jp->stopstatus;
4098 col += sprint_status48(s + col, status, 0);
4100 /* By now, "[JOBID]* [maybe PID] STATUS" is printed */
4102 /* This loop either prints "<cmd1> | <cmd2> | <cmd3>" line
4103 * or prints several "PID | <cmdN>" lines,
4104 * depending on SHOW_PIDS bit.
4105 * We do not print status of individual processes
4106 * between PID and <cmdN>. bash does it, but not very well:
4107 * first line shows overall job status, not process status,
4108 * making it impossible to know 1st process status.
4112 /* for each process */
4115 if (mode & SHOW_PIDS)
4116 col = fmtstr(s, 48, "\n%*c%d ", indent_col, ' ', ps->ps_pid) - 1;
4118 fprintf(out, "%s%*c%s%s",
4120 33 - col >= 0 ? 33 - col : 0, ' ',
4121 ps == jp->ps ? "" : "| ",
4124 } while (++ps != psend);
4125 newline_and_flush(out);
4129 if (jp->state == JOBDONE) {
4130 TRACE(("showjob: freeing job %d\n", jobno(jp)));
4136 * Print a list of jobs. If "change" is nonzero, only print jobs whose
4137 * statuses have changed since the last call to showjobs.
4144 TRACE(("showjobs(0x%x) called\n", mode));
4146 /* Handle all finished jobs */
4147 while (dowait(DOWAIT_NONBLOCK, NULL) > 0)
4150 for (jp = curjob; jp; jp = jp->prev_job) {
4151 if (!(mode & SHOW_CHANGED) || jp->changed) {
4157 static int FAST_FUNC
4158 jobscmd(int argc UNUSED_PARAM, char **argv)
4163 while ((m = nextopt("lp")) != '\0') {
4167 mode |= SHOW_ONLY_PGID;
4173 showjob(getjob(*argv, 0), mode);
4183 /* Called only on finished or stopped jobs (no members are running) */
4185 getstatus(struct job *job)
4189 struct procstat *ps;
4191 /* Fetch last member's status */
4192 ps = job->ps + job->nprocs - 1;
4193 status = ps->ps_status;
4195 /* "set -o pipefail" mode: use last _nonzero_ status */
4196 while (status == 0 && --ps >= job->ps)
4197 status = ps->ps_status;
4200 retval = WEXITSTATUS(status);
4201 if (!WIFEXITED(status)) {
4203 retval = WSTOPSIG(status);
4204 if (!WIFSTOPPED(status))
4207 /* XXX: limits number of signals */
4208 retval = WTERMSIG(status);
4210 if (retval == SIGINT)
4216 TRACE(("getstatus: job %d, nproc %d, status 0x%x, retval 0x%x\n",
4217 jobno(job), job->nprocs, status, retval));
4221 static int FAST_FUNC
4222 waitcmd(int argc UNUSED_PARAM, char **argv)
4229 raise_exception(EXSIG);
4236 /* wait for all jobs */
4240 if (!jp) /* no running procs */
4242 if (jp->state == JOBRUNNING)
4247 blocking_wait_with_raise_on_sig();
4249 * "When bash is waiting for an asynchronous command via
4250 * the wait builtin, the reception of a signal for which a trap
4251 * has been set will cause the wait builtin to return immediately
4252 * with an exit status greater than 128, immediately after which
4253 * the trap is executed."
4255 * blocking_wait_with_raise_on_sig raises signal handlers
4256 * if it gets no pid (pid < 0). However,
4257 * if child sends us a signal *and immediately exits*,
4258 * blocking_wait_with_raise_on_sig gets pid > 0
4259 * and does not handle pending_sig. Check this case: */
4261 raise_exception(EXSIG);
4267 if (**argv != '%') {
4268 pid_t pid = number(*argv);
4273 if (job->ps[job->nprocs - 1].ps_pid == pid)
4275 job = job->prev_job;
4278 job = getjob(*argv, 0);
4280 /* loop until process terminated or stopped */
4281 while (job->state == JOBRUNNING)
4282 blocking_wait_with_raise_on_sig();
4284 retval = getstatus(job);
4297 struct job *jp, *jq;
4299 len = njobs * sizeof(*jp);
4301 jp = ckrealloc(jq, len + 4 * sizeof(*jp));
4303 offset = (char *)jp - (char *)jq;
4305 /* Relocate pointers */
4308 jq = (struct job *)((char *)jq + l);
4312 #define joff(p) ((struct job *)((char *)(p) + l))
4313 #define jmove(p) (p) = (void *)((char *)(p) + offset)
4314 if (joff(jp)->ps == &jq->ps0)
4315 jmove(joff(jp)->ps);
4316 if (joff(jp)->prev_job)
4317 jmove(joff(jp)->prev_job);
4327 jp = (struct job *)((char *)jp + len);
4331 } while (--jq >= jp);
4336 * Return a new job structure.
4337 * Called with interrupts off.
4340 makejob(/*union node *node,*/ int nprocs)
4345 for (i = njobs, jp = jobtab; ; jp++) {
4352 if (jp->state != JOBDONE || !jp->waited)
4361 memset(jp, 0, sizeof(*jp));
4363 /* jp->jobctl is a bitfield.
4364 * "jp->jobctl |= jobctl" likely to give awful code */
4368 jp->prev_job = curjob;
4373 jp->ps = ckmalloc(nprocs * sizeof(struct procstat));
4375 TRACE(("makejob(%d) returns %%%d\n", nprocs,
4382 * Return a string identifying a command (to be printed by the
4385 static char *cmdnextc;
4388 cmdputs(const char *s)
4390 static const char vstype[VSTYPE + 1][3] = {
4391 "", "}", "-", "+", "?", "=",
4392 "%", "%%", "#", "##"
4393 IF_ASH_BASH_COMPAT(, ":", "/", "//")
4396 const char *p, *str;
4400 unsigned char subtype = 0;
4404 nextc = makestrspace((strlen(s) + 1) * 8, cmdnextc);
4406 while ((c = *p++) != '\0') {
4414 if ((subtype & VSTYPE) == VSLENGTH)
4420 str = "\"}" + !(quoted & 1);
4427 #if ENABLE_SH_MATH_SUPPORT
4442 if ((subtype & VSTYPE) != VSNORMAL)
4444 str = vstype[subtype & VSTYPE];
4445 if (subtype & VSNUL)
4454 /* These can only happen inside quotes */
4467 while ((c = *str++) != '\0') {
4470 } /* while *p++ not NUL */
4473 USTPUTC('"', nextc);
4479 /* cmdtxt() and cmdlist() call each other */
4480 static void cmdtxt(union node *n);
4483 cmdlist(union node *np, int sep)
4485 for (; np; np = np->narg.next) {
4489 if (sep && np->narg.next)
4495 cmdtxt(union node *n)
4498 struct nodelist *lp;
4509 lp = n->npipe.cmdlist;
4527 cmdtxt(n->nbinary.ch1);
4543 cmdtxt(n->nif.test);
4545 if (n->nif.elsepart) {
4546 cmdtxt(n->nif.ifpart);
4548 n = n->nif.elsepart;
4566 cmdtxt(n->nbinary.ch1);
4576 cmdputs(n->nfor.var);
4578 cmdlist(n->nfor.args, 1);
4583 cmdputs(n->narg.text);
4587 cmdlist(n->ncmd.args, 1);
4588 cmdlist(n->ncmd.redirect, 0);
4601 cmdputs(n->ncase.expr->narg.text);
4603 for (np = n->ncase.cases; np; np = np->nclist.next) {
4604 cmdtxt(np->nclist.pattern);
4606 cmdtxt(np->nclist.body);
4620 #if ENABLE_ASH_BASH_COMPAT
4635 cmdputs(utoa(n->nfile.fd));
4637 if (n->type == NTOFD || n->type == NFROMFD) {
4638 cmdputs(utoa(n->ndup.dupfd));
4647 commandtext(union node *n)
4651 STARTSTACKSTR(cmdnextc);
4653 name = stackblock();
4654 TRACE(("commandtext: name %p, end %p\n\t\"%s\"\n",
4655 name, cmdnextc, cmdnextc));
4656 return ckstrdup(name);
4661 * Fork off a subshell. If we are doing job control, give the subshell its
4662 * own process group. Jp is a job structure that the job is to be added to.
4663 * N is the command that will be evaluated by the child. Both jp and n may
4664 * be NULL. The mode parameter can be one of the following:
4665 * FORK_FG - Fork off a foreground process.
4666 * FORK_BG - Fork off a background process.
4667 * FORK_NOJOB - Like FORK_FG, but don't give the process its own
4668 * process group even if job control is on.
4670 * When job control is turned off, background processes have their standard
4671 * input redirected to /dev/null (except for the second and later processes
4674 * Called with interrupts off.
4677 * Clear traps on a fork.
4684 for (tp = trap; tp < &trap[NSIG]; tp++) {
4685 if (*tp && **tp) { /* trap not NULL or "" (SIG_IGN) */
4687 if (trap_ptr == trap)
4689 /* else: it "belongs" to trap_ptr vector, don't free */
4691 if ((tp - trap) != 0)
4692 setsignal(tp - trap);
4699 /* Lives far away from here, needed for forkchild */
4700 static void closescript(void);
4702 /* Called after fork(), in child */
4703 static NOINLINE void
4704 forkchild(struct job *jp, union node *n, int mode)
4708 TRACE(("Child shell %d\n", getpid()));
4712 /* man bash: "Non-builtin commands run by bash have signal handlers
4713 * set to the values inherited by the shell from its parent".
4714 * Do we do it correctly? */
4718 if (mode == FORK_NOJOB /* is it `xxx` ? */
4719 && n && n->type == NCMD /* is it single cmd? */
4720 /* && n->ncmd.args->type == NARG - always true? */
4721 && n->ncmd.args && strcmp(n->ncmd.args->narg.text, "trap") == 0
4722 && n->ncmd.args->narg.next == NULL /* "trap" with no arguments */
4723 /* && n->ncmd.args->narg.backquote == NULL - do we need to check this? */
4725 TRACE(("Trap hack\n"));
4726 /* Awful hack for `trap` or $(trap).
4728 * http://www.opengroup.org/onlinepubs/009695399/utilities/trap.html
4729 * contains an example where "trap" is executed in a subshell:
4731 * save_traps=$(trap)
4733 * eval "$save_traps"
4735 * Standard does not say that "trap" in subshell shall print
4736 * parent shell's traps. It only says that its output
4737 * must have suitable form, but then, in the above example
4738 * (which is not supposed to be normative), it implies that.
4740 * bash (and probably other shell) does implement it
4741 * (traps are reset to defaults, but "trap" still shows them),
4742 * but as a result, "trap" logic is hopelessly messed up:
4745 * trap -- 'echo Ho' SIGWINCH <--- we have a handler
4746 * # (trap) <--- trap is in subshell - no output (correct, traps are reset)
4747 * # true | trap <--- trap is in subshell - no output (ditto)
4748 * # echo `true | trap` <--- in subshell - output (but traps are reset!)
4749 * trap -- 'echo Ho' SIGWINCH
4750 * # echo `(trap)` <--- in subshell in subshell - output
4751 * trap -- 'echo Ho' SIGWINCH
4752 * # echo `true | (trap)` <--- in subshell in subshell in subshell - output!
4753 * trap -- 'echo Ho' SIGWINCH
4755 * The rules when to forget and when to not forget traps
4756 * get really complex and nonsensical.
4758 * Our solution: ONLY bare $(trap) or `trap` is special.
4760 /* Save trap handler strings for trap builtin to print */
4761 trap_ptr = xmemdup(trap, sizeof(trap));
4762 /* Fall through into clearing traps */
4766 /* do job control only in root shell */
4768 if (mode != FORK_NOJOB && jp->jobctl && oldlvl == 0) {
4771 if (jp->nprocs == 0)
4774 pgrp = jp->ps[0].ps_pid;
4775 /* this can fail because we are doing it in the parent also */
4777 if (mode == FORK_FG)
4778 xtcsetpgrp(ttyfd, pgrp);
4783 if (mode == FORK_BG) {
4784 /* man bash: "When job control is not in effect,
4785 * asynchronous commands ignore SIGINT and SIGQUIT" */
4788 if (jp->nprocs == 0) {
4790 if (open(bb_dev_null, O_RDONLY) != 0)
4791 ash_msg_and_raise_error("can't open '%s'", bb_dev_null);
4795 if (iflag) { /* why if iflag only? */
4800 * "In all cases, bash ignores SIGQUIT. Non-builtin
4801 * commands run by bash have signal handlers
4802 * set to the values inherited by the shell
4804 * Take care of the second rule: */
4808 if (n && n->type == NCMD
4809 && n->ncmd.args && strcmp(n->ncmd.args->narg.text, "jobs") == 0
4811 TRACE(("Job hack\n"));
4812 /* "jobs": we do not want to clear job list for it,
4813 * instead we remove only _its_ own_ job from job list.
4814 * This makes "jobs .... | cat" more useful.
4820 for (jp = curjob; jp; jp = jp->prev_job)
4825 /* Called after fork(), in parent */
4827 #define forkparent(jp, n, mode, pid) forkparent(jp, mode, pid)
4830 forkparent(struct job *jp, union node *n, int mode, pid_t pid)
4832 TRACE(("In parent shell: child = %d\n", pid));
4834 while (jobless && dowait(DOWAIT_NONBLOCK, NULL) > 0)
4840 if (mode != FORK_NOJOB && jp->jobctl) {
4843 if (jp->nprocs == 0)
4846 pgrp = jp->ps[0].ps_pid;
4847 /* This can fail because we are doing it in the child also */
4851 if (mode == FORK_BG) {
4852 backgndpid = pid; /* set $! */
4853 set_curjob(jp, CUR_RUNNING);
4856 struct procstat *ps = &jp->ps[jp->nprocs++];
4859 ps->ps_cmd = nullstr;
4861 if (doing_jobctl && n)
4862 ps->ps_cmd = commandtext(n);
4868 forkshell(struct job *jp, union node *n, int mode)
4872 TRACE(("forkshell(%%%d, %p, %d) called\n", jobno(jp), n, mode));
4875 TRACE(("Fork failed, errno=%d", errno));
4878 ash_msg_and_raise_error("can't fork");
4881 CLEAR_RANDOM_T(&random_gen); /* or else $RANDOM repeats in child */
4882 forkchild(jp, n, mode);
4884 forkparent(jp, n, mode, pid);
4890 * Wait for job to finish.
4892 * Under job control we have the problem that while a child process
4893 * is running interrupts generated by the user are sent to the child
4894 * but not to the shell. This means that an infinite loop started by
4895 * an interactive user may be hard to kill. With job control turned off,
4896 * an interactive user may place an interactive program inside a loop.
4897 * If the interactive program catches interrupts, the user doesn't want
4898 * these interrupts to also abort the loop. The approach we take here
4899 * is to have the shell ignore interrupt signals while waiting for a
4900 * foreground process to terminate, and then send itself an interrupt
4901 * signal if the child process was terminated by an interrupt signal.
4902 * Unfortunately, some programs want to do a bit of cleanup and then
4903 * exit on interrupt; unless these processes terminate themselves by
4904 * sending a signal to themselves (instead of calling exit) they will
4905 * confuse this approach.
4907 * Called with interrupts off.
4910 waitforjob(struct job *jp)
4914 TRACE(("waitforjob(%%%d) called\n", jobno(jp)));
4917 while (jp->state == JOBRUNNING) {
4918 /* In non-interactive shells, we _can_ get
4919 * a keyboard signal here and be EINTRed,
4920 * but we just loop back, waiting for command to complete.
4923 * "If bash is waiting for a command to complete and receives
4924 * a signal for which a trap has been set, the trap
4925 * will not be executed until the command completes."
4927 * Reality is that even if trap is not set, bash
4928 * will not act on the signal until command completes.
4929 * Try this. sleep5intoff.c:
4930 * #include <signal.h>
4931 * #include <unistd.h>
4934 * sigemptyset(&set);
4935 * sigaddset(&set, SIGINT);
4936 * sigaddset(&set, SIGQUIT);
4937 * sigprocmask(SIG_BLOCK, &set, NULL);
4941 * $ bash -c './sleep5intoff; echo hi'
4942 * ^C^C^C^C <--- pressing ^C once a second
4944 * $ bash -c './sleep5intoff; echo hi'
4945 * ^\^\^\^\hi <--- pressing ^\ (SIGQUIT)
4948 dowait(DOWAIT_BLOCK, jp);
4955 xtcsetpgrp(ttyfd, rootpid);
4957 * This is truly gross.
4958 * If we're doing job control, then we did a TIOCSPGRP which
4959 * caused us (the shell) to no longer be in the controlling
4960 * session -- so we wouldn't have seen any ^C/SIGINT. So, we
4961 * intuit from the subprocess exit status whether a SIGINT
4962 * occurred, and if so interrupt ourselves. Yuck. - mycroft
4964 if (jp->sigint) /* TODO: do the same with all signals */
4965 raise(SIGINT); /* ... by raise(jp->sig) instead? */
4967 if (jp->state == JOBDONE)
4974 * return 1 if there are stopped jobs, otherwise 0
4986 if (jp && jp->state == JOBSTOPPED) {
4987 out2str("You have stopped jobs.\n");
4996 /* ============ redir.c
4998 * Code for dealing with input/output redirection.
5003 #define EMPTY -2 /* marks an unused slot in redirtab */
5004 #define CLOSED -3 /* marks a slot of previously-closed fd */
5007 * Open a file in noclobber mode.
5008 * The code was copied from bash.
5011 noclobberopen(const char *fname)
5014 struct stat finfo, finfo2;
5017 * If the file exists and is a regular file, return an error
5020 r = stat(fname, &finfo);
5021 if (r == 0 && S_ISREG(finfo.st_mode)) {
5027 * If the file was not present (r != 0), make sure we open it
5028 * exclusively so that if it is created before we open it, our open
5029 * will fail. Make sure that we do not truncate an existing file.
5030 * Note that we don't turn on O_EXCL unless the stat failed -- if the
5031 * file was not a regular file, we leave O_EXCL off.
5034 return open(fname, O_WRONLY|O_CREAT|O_EXCL, 0666);
5035 fd = open(fname, O_WRONLY|O_CREAT, 0666);
5037 /* If the open failed, return the file descriptor right away. */
5042 * OK, the open succeeded, but the file may have been changed from a
5043 * non-regular file to a regular file between the stat and the open.
5044 * We are assuming that the O_EXCL open handles the case where FILENAME
5045 * did not exist and is symlinked to an existing file between the stat
5050 * If we can open it and fstat the file descriptor, and neither check
5051 * revealed that it was a regular file, and the file has not been
5052 * replaced, return the file descriptor.
5054 if (fstat(fd, &finfo2) == 0
5055 && !S_ISREG(finfo2.st_mode)
5056 && finfo.st_dev == finfo2.st_dev
5057 && finfo.st_ino == finfo2.st_ino
5062 /* The file has been replaced. badness. */
5069 * Handle here documents. Normally we fork off a process to write the
5070 * data to a pipe. If the document is short, we can stuff the data in
5071 * the pipe without forking.
5073 /* openhere needs this forward reference */
5074 static void expandhere(union node *arg, int fd);
5076 openhere(union node *redir)
5082 ash_msg_and_raise_error("pipe call failed");
5083 if (redir->type == NHERE) {
5084 len = strlen(redir->nhere.doc->narg.text);
5085 if (len <= PIPE_BUF) {
5086 full_write(pip[1], redir->nhere.doc->narg.text, len);
5090 if (forkshell((struct job *)NULL, (union node *)NULL, FORK_NOJOB) == 0) {
5093 ignoresig(SIGINT); //signal(SIGINT, SIG_IGN);
5094 ignoresig(SIGQUIT); //signal(SIGQUIT, SIG_IGN);
5095 ignoresig(SIGHUP); //signal(SIGHUP, SIG_IGN);
5096 ignoresig(SIGTSTP); //signal(SIGTSTP, SIG_IGN);
5097 signal(SIGPIPE, SIG_DFL);
5098 if (redir->type == NHERE)
5099 full_write(pip[1], redir->nhere.doc->narg.text, len);
5101 expandhere(redir->nhere.doc, pip[1]);
5102 _exit(EXIT_SUCCESS);
5110 openredirect(union node *redir)
5115 fname = redir->nfile.expfname;
5116 switch (redir->nfile.type) {
5118 f = open(fname, O_RDONLY);
5123 f = open(fname, O_RDWR|O_CREAT, 0666);
5128 #if ENABLE_ASH_BASH_COMPAT
5131 /* Take care of noclobber mode. */
5133 f = noclobberopen(fname);
5140 f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666);
5145 f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666);
5153 /* Fall through to eliminate warning. */
5154 /* Our single caller does this itself */
5161 f = openhere(redir);
5167 ash_msg_and_raise_error("can't create %s: %s", fname, errmsg(errno, "nonexistent directory"));
5169 ash_msg_and_raise_error("can't open %s: %s", fname, errmsg(errno, "no such file"));
5173 * Copy a file descriptor to be >= to. Returns -1
5174 * if the source file descriptor is closed, EMPTY if there are no unused
5175 * file descriptors left.
5177 /* 0x800..00: bit to set in "to" to request dup2 instead of fcntl(F_DUPFD).
5178 * old code was doing close(to) prior to copyfd() to achieve the same */
5180 COPYFD_EXACT = (int)~(INT_MAX),
5181 COPYFD_RESTORE = (int)((unsigned)COPYFD_EXACT >> 1),
5184 copyfd(int from, int to)
5188 if (to & COPYFD_EXACT) {
5189 to &= ~COPYFD_EXACT;
5191 newfd = dup2(from, to);
5193 newfd = fcntl(from, F_DUPFD, to);
5196 if (errno == EMFILE)
5198 /* Happens when source fd is not open: try "echo >&99" */
5199 ash_msg_and_raise_error("%d: %m", from);
5204 /* Struct def and variable are moved down to the first usage site */
5209 struct redirtab *next;
5212 struct two_fd_t two_fd[];
5214 #define redirlist (G_var.redirlist)
5216 static int need_to_remember(struct redirtab *rp, int fd)
5220 if (!rp) /* remembering was not requested */
5223 for (i = 0; i < rp->pair_count; i++) {
5224 if (rp->two_fd[i].orig == fd) {
5225 /* already remembered */
5232 /* "hidden" fd is a fd used to read scripts, or a copy of such */
5233 static int is_hidden_fd(struct redirtab *rp, int fd)
5236 struct parsefile *pf;
5240 /* Check open scripts' fds */
5243 /* We skip pf_fd == 0 case because of the following case:
5244 * $ ash # running ash interactively
5246 * and in script.sh: "exec 9>&0".
5247 * Even though top-level pf_fd _is_ 0,
5248 * it's still ok to use it: "read" builtin uses it,
5249 * why should we cripple "exec" builtin?
5251 if (pf->pf_fd > 0 && fd == pf->pf_fd) {
5259 /* Check saved fds of redirects */
5260 fd |= COPYFD_RESTORE;
5261 for (i = 0; i < rp->pair_count; i++) {
5262 if (rp->two_fd[i].copy == fd) {
5270 * Process a list of redirection commands. If the REDIR_PUSH flag is set,
5271 * old file descriptors are stashed away so that the redirection can be
5272 * undone by calling popredir.
5274 /* flags passed to redirect */
5275 #define REDIR_PUSH 01 /* save previous values of file descriptors */
5276 #define REDIR_SAVEFD2 03 /* set preverrout */
5278 redirect(union node *redir, int flags)
5280 struct redirtab *sv;
5285 int copied_fd2 = -1;
5295 if (flags & REDIR_PUSH) {
5296 union node *tmp = redir;
5299 #if ENABLE_ASH_BASH_COMPAT
5300 if (tmp->nfile.type == NTO2)
5303 tmp = tmp->nfile.next;
5305 sv = ckmalloc(sizeof(*sv) + sv_pos * sizeof(sv->two_fd[0]));
5306 sv->next = redirlist;
5307 sv->pair_count = sv_pos;
5309 sv->nullredirs = g_nullredirs - 1;
5311 while (sv_pos > 0) {
5313 sv->two_fd[sv_pos].orig = sv->two_fd[sv_pos].copy = EMPTY;
5319 fd = redir->nfile.fd;
5320 if (redir->nfile.type == NTOFD || redir->nfile.type == NFROMFD) {
5321 right_fd = redir->ndup.dupfd;
5322 //bb_error_msg("doing %d > %d", fd, right_fd);
5323 /* redirect from/to same file descriptor? */
5326 /* "echo >&10" and 10 is a fd opened to a sh script? */
5327 if (is_hidden_fd(sv, right_fd)) {
5328 errno = EBADF; /* as if it is closed */
5329 ash_msg_and_raise_error("%d: %m", right_fd);
5333 newfd = openredirect(redir); /* always >= 0 */
5335 /* Descriptor wasn't open before redirect.
5336 * Mark it for close in the future */
5337 if (need_to_remember(sv, fd)) {
5338 goto remember_to_close;
5343 #if ENABLE_ASH_BASH_COMPAT
5346 if (need_to_remember(sv, fd)) {
5347 /* Copy old descriptor */
5348 /* Careful to not accidentally "save"
5349 * to the same fd as right side fd in N>&M */
5350 int minfd = right_fd < 10 ? 10 : right_fd + 1;
5351 i = fcntl(fd, F_DUPFD, minfd);
5352 /* You'd expect copy to be CLOEXECed. Currently these extra "saved" fds
5353 * are closed in popredir() in the child, preventing them from leaking
5354 * into child. (popredir() also cleans up the mess in case of failures)
5359 /* Strange error (e.g. "too many files" EMFILE?) */
5363 ash_msg_and_raise_error("%d: %m", fd);
5366 /* EBADF: it is not open - good, remember to close it */
5369 } else { /* fd is open, save its copy */
5370 /* "exec fd>&-" should not close fds
5371 * which point to script file(s).
5372 * Force them to be restored afterwards */
5373 if (is_hidden_fd(sv, fd))
5374 i |= COPYFD_RESTORE;
5378 sv->two_fd[sv_pos].orig = fd;
5379 sv->two_fd[sv_pos].copy = i;
5383 /* NTOFD/NFROMFD: copy redir->ndup.dupfd to fd */
5384 if (redir->ndup.dupfd < 0) { /* "fd>&-" */
5385 /* Don't want to trigger debugging */
5389 copyfd(redir->ndup.dupfd, fd | COPYFD_EXACT);
5391 } else if (fd != newfd) { /* move newfd to fd */
5392 copyfd(newfd, fd | COPYFD_EXACT);
5393 #if ENABLE_ASH_BASH_COMPAT
5394 if (!(redir->nfile.type == NTO2 && fd == 2))
5398 #if ENABLE_ASH_BASH_COMPAT
5399 if (redir->nfile.type == NTO2 && fd == 1) {
5400 /* We already redirected it to fd 1, now copy it to 2 */
5406 } while ((redir = redir->nfile.next) != NULL);
5409 if ((flags & REDIR_SAVEFD2) && copied_fd2 >= 0)
5410 preverrout_fd = copied_fd2;
5414 * Undo the effects of the last redirection.
5417 popredir(int drop, int restore)
5419 struct redirtab *rp;
5422 if (--g_nullredirs >= 0 || redirlist == NULL)
5426 for (i = 0; i < rp->pair_count; i++) {
5427 int fd = rp->two_fd[i].orig;
5428 int copy = rp->two_fd[i].copy;
5429 if (copy == CLOSED) {
5434 if (copy != EMPTY) {
5435 if (!drop || (restore && (copy & COPYFD_RESTORE))) {
5436 copy &= ~COPYFD_RESTORE;
5438 copyfd(copy, fd | COPYFD_EXACT);
5440 close(copy & ~COPYFD_RESTORE);
5443 redirlist = rp->next;
5444 g_nullredirs = rp->nullredirs;
5450 * Undo all redirections. Called on error or interrupt.
5454 * Discard all saved file descriptors.
5457 clearredir(int drop)
5463 popredir(drop, /*restore:*/ 0);
5468 redirectsafe(union node *redir, int flags)
5471 volatile int saveint;
5472 struct jmploc *volatile savehandler = exception_handler;
5473 struct jmploc jmploc;
5476 /* "echo 9>/dev/null; echo >&9; echo result: $?" - result should be 1, not 2! */
5477 err = setjmp(jmploc.loc); // huh?? was = setjmp(jmploc.loc) * 2;
5479 exception_handler = &jmploc;
5480 redirect(redir, flags);
5482 exception_handler = savehandler;
5483 if (err && exception_type != EXERROR)
5484 longjmp(exception_handler->loc, 1);
5485 RESTORE_INT(saveint);
5490 /* ============ Routines to expand arguments to commands
5492 * We have to deal with backquotes, shell variables, and file metacharacters.
5495 #if ENABLE_SH_MATH_SUPPORT
5497 ash_arith(const char *s)
5499 arith_state_t math_state;
5502 math_state.lookupvar = lookupvar;
5503 math_state.setvar = setvar0;
5504 //math_state.endofname = endofname;
5507 result = arith(&math_state, s);
5508 if (math_state.errmsg)
5509 ash_msg_and_raise_error(math_state.errmsg);
5519 #define EXP_FULL 0x1 /* perform word splitting & file globbing */
5520 #define EXP_TILDE 0x2 /* do normal tilde expansion */
5521 #define EXP_VARTILDE 0x4 /* expand tildes in an assignment */
5522 #define EXP_REDIR 0x8 /* file glob for a redirection (1 match only) */
5523 #define EXP_CASE 0x10 /* keeps quotes around for CASE pattern */
5524 #define EXP_QPAT 0x20 /* pattern in quoted parameter expansion */
5525 #define EXP_VARTILDE2 0x40 /* expand tildes after colons only */
5526 #define EXP_WORD 0x80 /* expand word in parameter expansion */
5527 #define EXP_QUOTED 0x100 /* expand word in double quotes */
5531 #define RMESCAPE_ALLOC 0x1 /* Allocate a new string */
5532 #define RMESCAPE_GLOB 0x2 /* Add backslashes for glob */
5533 #define RMESCAPE_GROW 0x8 /* Grow strings instead of stalloc */
5534 #define RMESCAPE_HEAP 0x10 /* Malloc strings instead of stalloc */
5535 #define RMESCAPE_SLASH 0x20 /* Stop globbing after slash */
5537 /* Add CTLESC when necessary. */
5538 #define QUOTES_ESC (EXP_FULL | EXP_CASE | EXP_QPAT | EXP_REDIR)
5539 /* Do not skip NUL characters. */
5540 #define QUOTES_KEEPNUL EXP_TILDE
5543 * Structure specifying which parts of the string should be searched
5544 * for IFS characters.
5547 struct ifsregion *next; /* next region in list */
5548 int begoff; /* offset of start of region */
5549 int endoff; /* offset of end of region */
5550 int nulonly; /* search for nul bytes only */
5554 struct strlist *list;
5555 struct strlist **lastp;
5558 /* output of current string */
5559 static char *expdest;
5560 /* list of back quote expressions */
5561 static struct nodelist *argbackq;
5562 /* first struct in list of ifs regions */
5563 static struct ifsregion ifsfirst;
5564 /* last struct in list */
5565 static struct ifsregion *ifslastp;
5566 /* holds expanded arg list */
5567 static struct arglist exparg;
5572 #if !ENABLE_SH_MATH_SUPPORT
5573 /* cvtnum() is used even if math support is off (to prepare $? values and such) */
5574 typedef long arith_t;
5575 # define ARITH_FMT "%ld"
5582 expdest = makestrspace(sizeof(arith_t)*3 + 2, expdest);
5583 len = fmtstr(expdest, sizeof(arith_t)*3 + 2, ARITH_FMT, num);
5584 STADJUST(len, expdest);
5589 esclen(const char *start, const char *p)
5593 while (p > start && (unsigned char)*--p == CTLESC) {
5600 * Remove any CTLESC characters from a string.
5603 rmescapes(char *str, int flag)
5605 static const char qchars[] ALIGN1 = {
5606 IF_ASH_BASH_COMPAT('/',) CTLESC, CTLQUOTEMARK, '\0' };
5610 unsigned protect_against_glob;
5612 IF_ASH_BASH_COMPAT(unsigned slash = flag & RMESCAPE_SLASH;)
5614 p = strpbrk(str, qchars IF_ASH_BASH_COMPAT(+ !slash));
5620 if (flag & RMESCAPE_ALLOC) {
5621 size_t len = p - str;
5622 size_t fulllen = len + strlen(p) + 1;
5624 if (flag & RMESCAPE_GROW) {
5625 int strloc = str - (char *)stackblock();
5626 r = makestrspace(fulllen, expdest);
5627 /* p and str may be invalidated by makestrspace */
5628 str = (char *)stackblock() + strloc;
5630 } else if (flag & RMESCAPE_HEAP) {
5631 r = ckmalloc(fulllen);
5633 r = stalloc(fulllen);
5637 q = (char *)memcpy(q, str, len) + len;
5642 globbing = flag & RMESCAPE_GLOB;
5643 protect_against_glob = globbing;
5645 if ((unsigned char)*p == CTLQUOTEMARK) {
5646 // Note: both inquotes and protect_against_glob only affect whether
5647 inquotes = ~inquotes;
5649 protect_against_glob = globbing;
5652 if ((unsigned char)*p == CTLESC) {
5654 if (protect_against_glob) {
5657 } else if (*p == '\\' && !inquotes) {
5658 /* naked back slash */
5659 protect_against_glob = 0;
5662 #if ENABLE_ASH_BASH_COMPAT
5663 else if (*p == '/' && slash) {
5664 /* stop handling globbing and mark location of slash */
5665 globbing = slash = 0;
5669 protect_against_glob = globbing;
5674 if (flag & RMESCAPE_GROW) {
5676 STADJUST(q - r + 1, expdest);
5680 #define pmatch(a, b) !fnmatch((a), (b), 0)
5683 * Prepare a pattern for a expmeta (internal glob(3)) call.
5685 * Returns an stalloced string.
5688 preglob(const char *pattern, int flag)
5690 return rmescapes((char *)pattern, flag | RMESCAPE_GLOB);
5694 * Put a string on the stack.
5697 memtodest(const char *p, size_t len, int syntax, int quotes)
5704 q = makestrspace((quotes & QUOTES_ESC) ? len * 2 : len, expdest);
5707 unsigned char c = *p++;
5709 int n = SIT(c, syntax);
5710 if ((quotes & QUOTES_ESC)
5712 || (((quotes & EXP_FULL) || syntax != BASESYNTAX)
5718 } else if (!(quotes & QUOTES_KEEPNUL))
5727 strtodest(const char *p, int syntax, int quotes)
5729 size_t len = strlen(p);
5730 memtodest(p, len, syntax, quotes);
5735 * Record the fact that we have to scan this region of the
5736 * string for IFS characters.
5739 recordregion(int start, int end, int nulonly)
5741 struct ifsregion *ifsp;
5743 if (ifslastp == NULL) {
5747 ifsp = ckzalloc(sizeof(*ifsp));
5748 /*ifsp->next = NULL; - ckzalloc did it */
5749 ifslastp->next = ifsp;
5753 ifslastp->begoff = start;
5754 ifslastp->endoff = end;
5755 ifslastp->nulonly = nulonly;
5759 removerecordregions(int endoff)
5761 if (ifslastp == NULL)
5764 if (ifsfirst.endoff > endoff) {
5765 while (ifsfirst.next) {
5766 struct ifsregion *ifsp;
5768 ifsp = ifsfirst.next->next;
5769 free(ifsfirst.next);
5770 ifsfirst.next = ifsp;
5773 if (ifsfirst.begoff > endoff) {
5776 ifslastp = &ifsfirst;
5777 ifsfirst.endoff = endoff;
5782 ifslastp = &ifsfirst;
5783 while (ifslastp->next && ifslastp->next->begoff < endoff)
5784 ifslastp = ifslastp->next;
5785 while (ifslastp->next) {
5786 struct ifsregion *ifsp;
5788 ifsp = ifslastp->next->next;
5789 free(ifslastp->next);
5790 ifslastp->next = ifsp;
5793 if (ifslastp->endoff > endoff)
5794 ifslastp->endoff = endoff;
5798 exptilde(char *startp, char *p, int flags)
5804 int quotes = flags & QUOTES_ESC;
5808 while ((c = *++p) != '\0') {
5815 if (flags & EXP_VARTILDE)
5825 if (*name == '\0') {
5826 home = lookupvar("HOME");
5828 pw = getpwnam(name);
5833 if (!home || !*home)
5836 strtodest(home, SQSYNTAX, quotes);
5844 * Execute a command inside back quotes. If it's a builtin command, we
5845 * want to save its output in a block obtained from malloc. Otherwise
5846 * we fork off a subprocess and get the output of the command via a pipe.
5847 * Should be called with interrupts off.
5849 struct backcmd { /* result of evalbackcmd */
5850 int fd; /* file descriptor to read from */
5851 int nleft; /* number of chars in buffer */
5852 char *buf; /* buffer */
5853 struct job *jp; /* job structure for command */
5856 /* These forward decls are needed to use "eval" code for backticks handling: */
5857 static uint8_t back_exitstatus; /* exit status of backquoted command */
5858 #define EV_EXIT 01 /* exit after evaluating tree */
5859 static void evaltree(union node *, int);
5861 static void FAST_FUNC
5862 evalbackcmd(union node *n, struct backcmd *result)
5873 saveherefd = herefd;
5881 ash_msg_and_raise_error("pipe call failed");
5882 jp = makejob(/*n,*/ 1);
5883 if (forkshell(jp, n, FORK_NOJOB) == 0) {
5888 copyfd(pip[1], 1 | COPYFD_EXACT);
5892 evaltree(n, EV_EXIT); /* actually evaltreenr... */
5896 result->fd = pip[0];
5899 herefd = saveherefd;
5901 TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n",
5902 result->fd, result->buf, result->nleft, result->jp));
5906 * Expand stuff in backwards quotes.
5909 expbackq(union node *cmd, int flag)
5917 int syntax = flag & EXP_QUOTED ? DQSYNTAX : BASESYNTAX;
5918 struct stackmark smark;
5921 setstackmark(&smark);
5923 startloc = dest - (char *)stackblock();
5925 evalbackcmd(cmd, &in);
5926 popstackmark(&smark);
5933 memtodest(p, i, syntax, flag & QUOTES_ESC);
5937 i = nonblock_immune_read(in.fd, buf, sizeof(buf));
5938 TRACE(("expbackq: read returns %d\n", i));
5947 back_exitstatus = waitforjob(in.jp);
5951 /* Eat all trailing newlines */
5953 for (; dest > (char *)stackblock() && dest[-1] == '\n';)
5957 if (!(flag & EXP_QUOTED))
5958 recordregion(startloc, dest - (char *)stackblock(), 0);
5959 TRACE(("evalbackq: size:%d:'%.*s'\n",
5960 (int)((dest - (char *)stackblock()) - startloc),
5961 (int)((dest - (char *)stackblock()) - startloc),
5962 stackblock() + startloc));
5965 #if ENABLE_SH_MATH_SUPPORT
5967 * Expand arithmetic expression. Backup to start of expression,
5968 * evaluate, place result in (backed up) result, adjust string position.
5980 * This routine is slightly over-complicated for
5981 * efficiency. Next we scan backwards looking for the
5982 * start of arithmetic.
5984 start = stackblock();
5991 while ((unsigned char)*p != CTLARI) {
5995 ash_msg_and_raise_error("missing CTLARI (shouldn't happen)");
6000 esc = esclen(start, p);
6010 removerecordregions(begoff);
6014 if (flag & QUOTES_ESC)
6015 rmescapes(p + 1, 0);
6017 len = cvtnum(ash_arith(p + 1));
6019 if (!(flag & EXP_QUOTED))
6020 recordregion(begoff, begoff + len, 0);
6024 /* argstr needs it */
6025 static char *evalvar(char *p, int flags, struct strlist *var_str_list);
6028 * Perform variable and command substitution. If EXP_FULL is set, output CTLESC
6029 * characters to allow for further processing. Otherwise treat
6030 * $@ like $* since no splitting will be performed.
6032 * var_str_list (can be NULL) is a list of "VAR=val" strings which take precedence
6033 * over shell varables. Needed for "A=a B=$A; echo $B" case - we use it
6034 * for correct expansion of "B=$A" word.
6037 argstr(char *p, int flags, struct strlist *var_str_list)
6039 static const char spclchars[] ALIGN1 = {
6047 #if ENABLE_SH_MATH_SUPPORT
6052 const char *reject = spclchars;
6053 int breakall = (flags & (EXP_WORD | EXP_QUOTED)) == EXP_WORD;
6058 if (!(flags & EXP_VARTILDE)) {
6060 } else if (flags & EXP_VARTILDE2) {
6065 if (flags & EXP_TILDE) {
6068 flags &= ~EXP_TILDE;
6072 p = exptilde(p, q, flags);
6075 startloc = expdest - (char *)stackblock();
6079 length += strcspn(p + length, reject);
6083 IF_SH_MATH_SUPPORT(|| c == CTLENDARI)
6085 /* c == '=' || c == ':' || c == CTLENDARI */
6091 expdest = stack_nputstr(p, length, expdest);
6092 newloc = expdest - (char *)stackblock();
6093 if (breakall && !inquotes && newloc > startloc) {
6094 recordregion(startloc, newloc, 0);
6105 if (flags & EXP_VARTILDE2) {
6109 flags |= EXP_VARTILDE2;
6114 * sort of a hack - expand tildes in variable
6115 * assignments (after the first '=' and after ':'s).
6124 case CTLENDVAR: /* ??? */
6127 inquotes ^= EXP_QUOTED;
6128 /* "$@" syntax adherence hack */
6129 if (inquotes && !memcmp(p, dolatstr + 1, DOLATSTRLEN - 1)) {
6130 p = evalvar(p + 1, flags | inquotes, /* var_str_list: */ NULL) + 1;
6134 if (flags & QUOTES_ESC) {
6145 * Quoted parameter expansion pattern: remove quote
6146 * unless inside inner quotes or we have a literal
6149 if (((flags | inquotes) & (EXP_QPAT | EXP_QUOTED)) ==
6150 EXP_QPAT && *p != '\\')
6155 TRACE(("argstr: evalvar('%s')\n", p));
6156 p = evalvar(p, flags | inquotes, var_str_list);
6157 TRACE(("argstr: evalvar:'%s'\n", (char *)stackblock()));
6160 expbackq(argbackq->n, flags | inquotes);
6161 argbackq = argbackq->next;
6163 #if ENABLE_SH_MATH_SUPPORT
6166 expari(flags | inquotes);
6175 scanleft(char *startp, char *rmesc, char *rmescend UNUSED_PARAM,
6176 char *pattern, int quotes, int zero)
6185 const char *s = loc2;
6192 match = pmatch(pattern, s);
6197 if (quotes && (unsigned char)*loc == CTLESC)
6206 scanright(char *startp, char *rmesc, char *rmescend,
6207 char *pattern, int quotes, int match_at_start)
6209 #if !ENABLE_ASH_OPTIMIZE_FOR_SIZE
6210 int try2optimize = match_at_start;
6216 /* If we called by "${v/pattern/repl}" or "${v//pattern/repl}":
6217 * startp="escaped_value_of_v" rmesc="raw_value_of_v"
6218 * rmescend=""(ptr to NUL in rmesc) pattern="pattern" quotes=match_at_start=1
6220 * loc starts at NUL at the end of startp, loc2 starts at the end of rmesc,
6221 * and on each iteration they go back two/one char until they reach the beginning.
6222 * We try to find a match in "raw_value_of_v", "raw_value_of_", "raw_value_of" etc.
6224 /* TODO: document in what other circumstances we are called. */
6226 for (loc = pattern - 1, loc2 = rmescend; loc >= startp; loc2--) {
6229 const char *s = loc2;
6230 if (match_at_start) {
6234 match = pmatch(pattern, s);
6235 //bb_error_msg("pmatch(pattern:'%s',s:'%s'):%d", pattern, s, match);
6239 #if !ENABLE_ASH_OPTIMIZE_FOR_SIZE
6241 /* Maybe we can optimize this:
6242 * if pattern ends with unescaped *, we can avoid checking
6243 * shorter strings: if "foo*" doesnt match "raw_value_of_v",
6244 * it wont match truncated "raw_value_of_" strings too.
6246 unsigned plen = strlen(pattern);
6247 /* Does it end with "*"? */
6248 if (plen != 0 && pattern[--plen] == '*') {
6249 /* "xxxx*" is not escaped */
6250 /* "xxx\*" is escaped */
6251 /* "xx\\*" is not escaped */
6252 /* "x\\\*" is escaped */
6254 while (plen != 0 && pattern[--plen] == '\\')
6257 break; /* ends with unescaped "*" */
6265 esc = esclen(startp, loc);
6276 static void varunset(const char *, const char *, const char *, int) NORETURN;
6278 varunset(const char *end, const char *var, const char *umsg, int varflags)
6284 msg = "parameter not set";
6286 if ((unsigned char)*end == CTLENDVAR) {
6287 if (varflags & VSNUL)
6293 ash_msg_and_raise_error("%.*s: %s%s", (int)(end - var - 1), var, msg, tail);
6297 subevalvar(char *p, char *varname, int strloc, int subtype,
6298 int startloc, int varflags, int flag, struct strlist *var_str_list)
6300 struct nodelist *saveargbackq = argbackq;
6301 int quotes = flag & QUOTES_ESC;
6304 char *rmesc, *rmescend;
6306 IF_ASH_BASH_COMPAT(char *repl = NULL;)
6307 IF_ASH_BASH_COMPAT(int pos, len, orig_len;)
6308 int saveherefd = herefd;
6309 int amount, resetloc;
6310 IF_ASH_BASH_COMPAT(int workloc;)
6312 char *(*scan)(char*, char*, char*, char*, int, int);
6314 //bb_error_msg("subevalvar(p:'%s',varname:'%s',strloc:%d,subtype:%d,startloc:%d,varflags:%x,quotes:%d)",
6315 // p, varname, strloc, subtype, startloc, varflags, quotes);
6318 argstr(p, EXP_TILDE | (subtype != VSASSIGN && subtype != VSQUESTION ?
6319 (flag & (EXP_QUOTED | EXP_QPAT) ? EXP_QPAT : EXP_CASE) : 0),
6321 STPUTC('\0', expdest);
6322 herefd = saveherefd;
6323 argbackq = saveargbackq;
6324 startp = (char *)stackblock() + startloc;
6328 setvar0(varname, startp);
6329 amount = startp - expdest;
6330 STADJUST(amount, expdest);
6334 varunset(p, varname, startp, varflags);
6337 #if ENABLE_ASH_BASH_COMPAT
6339 //TODO: support more general format ${v:EXPR:EXPR},
6340 // where EXPR follows $(()) rules
6341 loc = str = stackblock() + strloc;
6342 /* Read POS in ${var:POS:LEN} */
6343 pos = atoi(loc); /* number(loc) errors out on "1:4" */
6344 len = str - startp - 1;
6346 /* *loc != '\0', guaranteed by parser */
6350 /* Adjust the length by the number of escapes */
6351 for (ptr = startp; ptr < (str - 1); ptr++) {
6352 if ((unsigned char)*ptr == CTLESC) {
6360 if (*loc++ == ':') {
6364 /* Skip POS in ${var:POS:LEN} */
6366 while (*loc && *loc != ':') {
6368 * bash complains on: var=qwe; echo ${var:1a:123}
6370 ash_msg_and_raise_error(msg_illnum, str);
6374 if (*loc++ == ':') {
6379 /* ${VAR:$((-n)):l} starts n chars from the end */
6380 pos = orig_len + pos;
6382 if ((unsigned)pos >= orig_len) {
6383 /* apart from obvious ${VAR:999999:l},
6384 * covers ${VAR:$((-9999999)):l} - result is ""
6390 if (len > (orig_len - pos))
6391 len = orig_len - pos;
6393 for (str = startp; pos; str++, pos--) {
6394 if (quotes && (unsigned char)*str == CTLESC)
6397 for (loc = startp; len; len--) {
6398 if (quotes && (unsigned char)*str == CTLESC)
6403 amount = loc - expdest;
6404 STADJUST(amount, expdest);
6409 resetloc = expdest - (char *)stackblock();
6411 /* We'll comeback here if we grow the stack while handling
6412 * a VSREPLACE or VSREPLACEALL, since our pointers into the
6413 * stack will need rebasing, and we'll need to remove our work
6416 IF_ASH_BASH_COMPAT(restart:)
6418 amount = expdest - ((char *)stackblock() + resetloc);
6419 STADJUST(-amount, expdest);
6420 startp = (char *)stackblock() + startloc;
6423 rmescend = (char *)stackblock() + strloc;
6425 rmesc = rmescapes(startp, RMESCAPE_ALLOC | RMESCAPE_GROW);
6426 if (rmesc != startp) {
6428 startp = (char *)stackblock() + startloc;
6432 str = (char *)stackblock() + strloc;
6434 * Example: v='a\bc'; echo ${v/\\b/_\\_\z_}
6435 * The result is a_\_z_c (not a\_\_z_c)!
6437 * The search pattern and replace string treat backslashes differently!
6438 * RMESCAPE_SLASH causes preglob to work differently on the pattern
6439 * and string. It's only used on the first call.
6441 preglob(str, IF_ASH_BASH_COMPAT(
6442 (subtype == VSREPLACE || subtype == VSREPLACEALL) && !repl ?
6443 RMESCAPE_SLASH :) 0);
6445 #if ENABLE_ASH_BASH_COMPAT
6446 workloc = expdest - (char *)stackblock();
6447 if (subtype == VSREPLACE || subtype == VSREPLACEALL) {
6451 repl = strchr(str, CTLESC);
6457 //bb_error_msg("str:'%s' repl:'%s'", str, repl);
6459 /* If there's no pattern to match, return the expansion unmolested */
6468 loc = scanright(idx, rmesc, rmescend, str, quotes, 1);
6469 //bb_error_msg("scanright('%s'):'%s'", str, loc);
6471 /* No match, advance */
6472 char *restart_detect = stackblock();
6474 STPUTC(*idx, expdest);
6475 if (quotes && (unsigned char)*idx == CTLESC) {
6478 STPUTC(*idx, expdest);
6480 if (stackblock() != restart_detect)
6485 /* continue; - prone to quadratic behavior, smarter code: */
6488 if (str[0] == '*') {
6489 /* Pattern is "*foo". If "*foo" does not match "long_string",
6490 * it would never match "ong_string" etc, no point in trying.
6497 if (subtype == VSREPLACEALL) {
6499 if (quotes && (unsigned char)*idx == CTLESC)
6508 //bb_error_msg("repl:'%s'", repl);
6509 for (loc = (char*)repl; *loc; loc++) {
6510 char *restart_detect = stackblock();
6511 if (quotes && *loc == '\\') {
6512 STPUTC(CTLESC, expdest);
6515 STPUTC(*loc, expdest);
6516 if (stackblock() != restart_detect)
6521 if (subtype == VSREPLACE) {
6522 //bb_error_msg("tail:'%s', quotes:%x", idx, quotes);
6524 char *restart_detect = stackblock();
6525 STPUTC(*idx, expdest);
6526 if (stackblock() != restart_detect)
6535 /* We've put the replaced text into a buffer at workloc, now
6536 * move it to the right place and adjust the stack.
6538 STPUTC('\0', expdest);
6539 startp = (char *)stackblock() + startloc;
6540 memmove(startp, (char *)stackblock() + workloc, len + 1);
6541 //bb_error_msg("startp:'%s'", startp);
6542 amount = expdest - (startp + len);
6543 STADJUST(-amount, expdest);
6546 #endif /* ENABLE_ASH_BASH_COMPAT */
6548 subtype -= VSTRIMRIGHT;
6550 if (subtype < 0 || subtype > 7)
6553 /* zero = (subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX) */
6554 zero = subtype >> 1;
6555 /* VSTRIMLEFT/VSTRIMRIGHTMAX -> scanleft */
6556 scan = (subtype & 1) ^ zero ? scanleft : scanright;
6558 loc = scan(startp, rmesc, rmescend, str, quotes, zero);
6561 memmove(startp, loc, str - loc);
6562 loc = startp + (str - loc) - 1;
6565 amount = loc - expdest;
6566 STADJUST(amount, expdest);
6572 * Add the value of a specialized variable to the stack string.
6573 * name parameter (examples):
6574 * ash -c 'echo $1' name:'1='
6575 * ash -c 'echo $qwe' name:'qwe='
6576 * ash -c 'echo $$' name:'$='
6577 * ash -c 'echo ${$}' name:'$='
6578 * ash -c 'echo ${$##q}' name:'$=q'
6579 * ash -c 'echo ${#$}' name:'$='
6580 * note: examples with bad shell syntax:
6581 * ash -c 'echo ${#$1}' name:'$=1'
6582 * ash -c 'echo ${#1#}' name:'1=#'
6584 static NOINLINE ssize_t
6585 varvalue(char *name, int varflags, int flags, struct strlist *var_str_list)
6592 int quoted = flags & EXP_QUOTED;
6593 int subtype = varflags & VSTYPE;
6594 int discard = subtype == VSPLUS || subtype == VSLENGTH;
6595 int quotes = (discard ? 0 : (flags & QUOTES_ESC)) | QUOTES_KEEPNUL;
6596 int syntax = quoted ? DQSYNTAX : BASESYNTAX;
6598 sep = quoted ? ((flags & EXP_FULL) << CHAR_BIT) : 0;
6608 num = shellparam.nparam;
6616 goto check_1char_name;
6618 expdest = makestrspace(NOPTS, expdest);
6619 for (i = NOPTS - 1; i >= 0; i--) {
6621 USTPUTC(optletters(i), expdest);
6627 /* handles cases similar to ${#$1} */
6628 if (name[2] != '\0')
6629 raise_error_syntax("bad substitution");
6636 if (quoted && (flags & EXP_FULL)) {
6637 /* note: this is not meant as PEOF value */
6638 sep = 1 << CHAR_BIT;
6643 sep = ifsset() ? (unsigned char)(ifsval()[0]) : ' ';
6649 while ((p = *ap++) != NULL) {
6650 len += strtodest(p, syntax, quotes);
6654 memtodest(&sepc, 1, syntax, quotes);
6658 } /* case '@' and '*' */
6669 num = atoi(name); /* number(name) fails on ${N#str} etc */
6670 if (num < 0 || num > shellparam.nparam)
6672 p = num ? shellparam.p[num - 1] : arg0;
6675 /* NB: name has form "VAR=..." */
6677 /* "A=a B=$A" case: var_str_list is a list of "A=a" strings
6678 * which should be considered before we check variables. */
6680 unsigned name_len = (strchrnul(name, '=') - name) + 1;
6684 str = var_str_list->text;
6685 eq = strchr(str, '=');
6686 if (!eq) /* stop at first non-assignment */
6689 if (name_len == (unsigned)(eq - str)
6690 && strncmp(str, name, name_len) == 0
6693 /* goto value; - WRONG! */
6694 /* think "A=1 A=2 B=$A" */
6696 var_str_list = var_str_list->next;
6697 } while (var_str_list);
6701 p = lookupvar(name);
6706 len = strtodest(p, syntax, quotes);
6707 #if ENABLE_UNICODE_SUPPORT
6708 if (subtype == VSLENGTH && len > 0) {
6709 reinit_unicode_for_ash();
6710 if (unicode_status == UNICODE_ON) {
6711 STADJUST(-len, expdest);
6713 len = unicode_strlen(p);
6721 STADJUST(-len, expdest);
6726 * Expand a variable, and return a pointer to the next character in the
6730 evalvar(char *p, int flags, struct strlist *var_str_list)
6741 varflags = (unsigned char) *p++;
6742 subtype = varflags & VSTYPE;
6743 quoted = flags & EXP_QUOTED;
6745 easy = (!quoted || (*var == '@' && shellparam.nparam));
6746 startloc = expdest - (char *)stackblock();
6747 p = strchr(p, '=') + 1; //TODO: use var_end(p)?
6750 varlen = varvalue(var, varflags, flags, var_str_list);
6751 if (varflags & VSNUL)
6754 if (subtype == VSPLUS) {
6755 varlen = -1 - varlen;
6759 if (subtype == VSMINUS) {
6764 flags | EXP_TILDE | EXP_WORD,
6774 if (subtype == VSASSIGN || subtype == VSQUESTION) {
6776 if (subevalvar(p, var, /* strloc: */ 0,
6777 subtype, startloc, varflags,
6778 /* quotes: */ flags & ~QUOTES_ESC,
6783 * Remove any recorded regions beyond
6786 removerecordregions(startloc);
6796 if (varlen < 0 && uflag)
6797 varunset(p, var, 0, 0);
6799 if (subtype == VSLENGTH) {
6800 cvtnum(varlen > 0 ? varlen : 0);
6804 if (subtype == VSNORMAL) {
6815 case VSTRIMRIGHTMAX:
6816 #if ENABLE_ASH_BASH_COMPAT
6829 * Terminate the string and start recording the pattern
6832 STPUTC('\0', expdest);
6833 patloc = expdest - (char *)stackblock();
6834 if (NULL == subevalvar(p, /* varname: */ NULL, patloc, subtype,
6835 startloc, varflags, flags, var_str_list)) {
6836 int amount = expdest - (
6837 (char *)stackblock() + patloc - 1
6839 STADJUST(-amount, expdest);
6841 /* Remove any recorded regions beyond start of variable */
6842 removerecordregions(startloc);
6844 recordregion(startloc, expdest - (char *)stackblock(), quoted);
6848 if (subtype != VSNORMAL) { /* skip to end of alternative */
6851 unsigned char c = *p++;
6854 else if (c == CTLBACKQ) {
6856 argbackq = argbackq->next;
6857 } else if (c == CTLVAR) {
6858 if ((*p++ & VSTYPE) != VSNORMAL)
6860 } else if (c == CTLENDVAR) {
6870 * Break the argument string into pieces based upon IFS and add the
6871 * strings to the argument list. The regions of the string to be
6872 * searched for IFS characters have been stored by recordregion.
6875 ifsbreakup(char *string, struct arglist *arglist)
6877 struct ifsregion *ifsp;
6882 const char *ifs, *realifs;
6887 if (ifslastp != NULL) {
6890 realifs = ifsset() ? ifsval() : defifs;
6893 p = string + ifsp->begoff;
6894 nulonly = ifsp->nulonly;
6895 ifs = nulonly ? nullstr : realifs;
6897 while (p < string + ifsp->endoff) {
6899 if ((unsigned char)*p == CTLESC)
6901 if (!strchr(ifs, *p)) {
6906 ifsspc = (strchr(defifs, *p) != NULL);
6907 /* Ignore IFS whitespace at start */
6908 if (q == start && ifsspc) {
6914 sp = stzalloc(sizeof(*sp));
6916 *arglist->lastp = sp;
6917 arglist->lastp = &sp->next;
6921 if (p >= string + ifsp->endoff) {
6925 if ((unsigned char)*p == CTLESC)
6927 if (strchr(ifs, *p) == NULL) {
6931 if (strchr(defifs, *p) == NULL) {
6946 } while (ifsp != NULL);
6955 sp = stzalloc(sizeof(*sp));
6957 *arglist->lastp = sp;
6958 arglist->lastp = &sp->next;
6964 struct ifsregion *p;
6969 struct ifsregion *ifsp;
6975 ifsfirst.next = NULL;
6980 * Add a file name to the list.
6983 addfname(const char *name)
6987 sp = stzalloc(sizeof(*sp));
6988 sp->text = ststrdup(name);
6990 exparg.lastp = &sp->next;
6993 /* If we want to use glob() from libc... */
6996 /* Add the result of glob() to the list */
6998 addglob(const glob_t *pglob)
7000 char **p = pglob->gl_pathv;
7007 expandmeta(struct strlist *str /*, int flag*/)
7009 /* TODO - EXP_REDIR */
7019 p = preglob(str->text, RMESCAPE_ALLOC | RMESCAPE_HEAP);
7021 * GLOB_NOMAGIC (GNU): if no *?[ chars in pattern, return it even if no match
7022 * TODO?: GLOB_NOCHECK: if no match, return unchanged pattern (sans \* escapes?)
7024 i = glob(p, GLOB_NOMAGIC, NULL, &pglob);
7029 /* GLOB_MAGCHAR is set if *?[ chars were seen (GNU) */
7030 if (!(pglob.gl_flags & GLOB_MAGCHAR))
7041 *exparg.lastp = str;
7042 rmescapes(str->text, 0);
7043 exparg.lastp = &str->next;
7045 default: /* GLOB_NOSPACE */
7048 ash_msg_and_raise_error(bb_msg_memory_exhausted);
7055 /* Homegrown globbing code. (dash also has both, uses homegrown one.) */
7058 * Do metacharacter (i.e. *, ?, [...]) expansion.
7061 expmeta(char *expdir, char *enddir, char *name)
7077 for (p = name; esc = 0, *p; p += esc + 1) {
7078 if (*p == '*' || *p == '?')
7080 else if (*p == '[') {
7087 if (*q == '/' || *q == '\0')
7097 if (p[esc] == '/') {
7100 start = p + esc + 1;
7104 if (metaflag == 0) { /* we've reached the end of the file name */
7105 if (enddir != expdir)
7113 if (metaflag == 0 || lstat(expdir, &statb) >= 0)
7124 } while (p < start);
7126 if (enddir == expdir) {
7128 } else if (enddir == expdir + 1 && *expdir == '/') {
7137 if (enddir != expdir)
7139 if (*endname == 0) {
7152 while (!pending_int && (dp = readdir(dirp)) != NULL) {
7153 if (dp->d_name[0] == '.' && !matchdot)
7155 if (pmatch(start, dp->d_name)) {
7157 strcpy(enddir, dp->d_name);
7160 for (p = enddir, cp = dp->d_name; (*p++ = *cp++) != '\0';)
7163 expmeta(expdir, p, endname);
7169 endname[-esc - 1] = esc ? '\\' : '/';
7172 static struct strlist *
7173 msort(struct strlist *list, int len)
7175 struct strlist *p, *q = NULL;
7176 struct strlist **lpp;
7184 for (n = half; --n >= 0;) {
7188 q->next = NULL; /* terminate first half of list */
7189 q = msort(list, half); /* sort first half of list */
7190 p = msort(p, len - half); /* sort second half */
7193 #if ENABLE_LOCALE_SUPPORT
7194 if (strcoll(p->text, q->text) < 0)
7196 if (strcmp(p->text, q->text) < 0)
7220 * Sort the results of file name expansion. It calculates the number of
7221 * strings to sort and then calls msort (short for merge sort) to do the
7224 static struct strlist *
7225 expsort(struct strlist *str)
7231 for (sp = str; sp; sp = sp->next)
7233 return msort(str, len);
7237 expandmeta(struct strlist *str /*, int flag*/)
7239 static const char metachars[] ALIGN1 = {
7242 /* TODO - EXP_REDIR */
7246 struct strlist **savelastp;
7252 if (!strpbrk(str->text, metachars))
7254 savelastp = exparg.lastp;
7257 p = preglob(str->text, RMESCAPE_ALLOC | RMESCAPE_HEAP);
7259 int i = strlen(str->text);
7260 //BUGGY estimation of how long expanded name can be
7261 expdir = ckmalloc(i < 2048 ? 2048 : i+1);
7263 expmeta(expdir, expdir, p);
7268 if (exparg.lastp == savelastp) {
7273 *exparg.lastp = str;
7274 rmescapes(str->text, 0);
7275 exparg.lastp = &str->next;
7277 *exparg.lastp = NULL;
7278 *savelastp = sp = expsort(*savelastp);
7279 while (sp->next != NULL)
7281 exparg.lastp = &sp->next;
7286 #endif /* our globbing code */
7289 * Perform variable substitution and command substitution on an argument,
7290 * placing the resulting list of arguments in arglist. If EXP_FULL is true,
7291 * perform splitting and file name expansion. When arglist is NULL, perform
7292 * here document expansion.
7295 expandarg(union node *arg, struct arglist *arglist, int flag)
7300 argbackq = arg->narg.backquote;
7301 STARTSTACKSTR(expdest);
7302 ifsfirst.next = NULL;
7304 TRACE(("expandarg: argstr('%s',flags:%x)\n", arg->narg.text, flag));
7305 argstr(arg->narg.text, flag,
7306 /* var_str_list: */ arglist ? arglist->list : NULL);
7307 p = _STPUTC('\0', expdest);
7309 if (arglist == NULL) {
7310 return; /* here document expanded */
7312 p = grabstackstr(p);
7313 TRACE(("expandarg: p:'%s'\n", p));
7314 exparg.lastp = &exparg.list;
7318 if (flag & EXP_FULL) {
7319 ifsbreakup(p, &exparg);
7320 *exparg.lastp = NULL;
7321 exparg.lastp = &exparg.list;
7322 expandmeta(exparg.list /*, flag*/);
7324 if (flag & EXP_REDIR) { /*XXX - for now, just remove escapes */
7326 TRACE(("expandarg: rmescapes:'%s'\n", p));
7328 sp = stzalloc(sizeof(*sp));
7331 exparg.lastp = &sp->next;
7335 *exparg.lastp = NULL;
7337 *arglist->lastp = exparg.list;
7338 arglist->lastp = exparg.lastp;
7343 * Expand shell variables and backquotes inside a here document.
7346 expandhere(union node *arg, int fd)
7349 expandarg(arg, (struct arglist *)NULL, EXP_QUOTED);
7350 full_write(fd, stackblock(), expdest - (char *)stackblock());
7354 * Returns true if the pattern matches the string.
7357 patmatch(char *pattern, const char *string)
7359 return pmatch(preglob(pattern, 0), string);
7363 * See if a pattern matches in a case statement.
7366 casematch(union node *pattern, char *val)
7368 struct stackmark smark;
7371 setstackmark(&smark);
7372 argbackq = pattern->narg.backquote;
7373 STARTSTACKSTR(expdest);
7375 argstr(pattern->narg.text, EXP_TILDE | EXP_CASE,
7376 /* var_str_list: */ NULL);
7377 STACKSTRNUL(expdest);
7378 result = patmatch(stackblock(), val);
7379 popstackmark(&smark);
7384 /* ============ find_command */
7388 int (*builtin)(int, char **) FAST_FUNC;
7389 /* unsigned flags; */
7391 #define IS_BUILTIN_SPECIAL(b) ((b)->name[0] & 1)
7392 /* "regular" builtins always take precedence over commands,
7393 * regardless of PATH=....%builtin... position */
7394 #define IS_BUILTIN_REGULAR(b) ((b)->name[0] & 2)
7395 #define IS_BUILTIN_ASSIGN(b) ((b)->name[0] & 4)
7398 smallint cmdtype; /* CMDxxx */
7401 /* index >= 0 for commands without path (slashes) */
7402 /* (TODO: what exactly does the value mean? PATH position?) */
7403 /* index == -1 for commands with slashes */
7404 /* index == (-2 - applet_no) for NOFORK applets */
7405 const struct builtincmd *cmd;
7406 struct funcnode *func;
7409 /* values of cmdtype */
7410 #define CMDUNKNOWN -1 /* no entry in table for command */
7411 #define CMDNORMAL 0 /* command is an executable program */
7412 #define CMDFUNCTION 1 /* command is a shell function */
7413 #define CMDBUILTIN 2 /* command is a shell builtin */
7415 /* action to find_command() */
7416 #define DO_ERR 0x01 /* prints errors */
7417 #define DO_ABS 0x02 /* checks absolute paths */
7418 #define DO_NOFUNC 0x04 /* don't return shell functions, for command */
7419 #define DO_ALTPATH 0x08 /* using alternate path */
7420 #define DO_ALTBLTIN 0x20 /* %builtin in alt. path */
7422 static void find_command(char *, struct cmdentry *, int, const char *);
7425 /* ============ Hashing commands */
7428 * When commands are first encountered, they are entered in a hash table.
7429 * This ensures that a full path search will not have to be done for them
7430 * on each invocation.
7432 * We should investigate converting to a linear search, even though that
7433 * would make the command name "hash" a misnomer.
7437 struct tblentry *next; /* next entry in hash chain */
7438 union param param; /* definition of builtin function */
7439 smallint cmdtype; /* CMDxxx */
7440 char rehash; /* if set, cd done since entry created */
7441 char cmdname[1]; /* name of command */
7444 static struct tblentry **cmdtable;
7445 #define INIT_G_cmdtable() do { \
7446 cmdtable = xzalloc(CMDTABLESIZE * sizeof(cmdtable[0])); \
7449 static int builtinloc = -1; /* index in path of %builtin, or -1 */
7453 tryexec(IF_FEATURE_SH_STANDALONE(int applet_no,) char *cmd, char **argv, char **envp)
7455 #if ENABLE_FEATURE_SH_STANDALONE
7456 if (applet_no >= 0) {
7457 if (APPLET_IS_NOEXEC(applet_no)) {
7461 run_applet_no_and_exit(applet_no, argv);
7463 /* re-exec ourselves with the new arguments */
7464 execve(bb_busybox_exec_path, argv, envp);
7465 /* If they called chroot or otherwise made the binary no longer
7466 * executable, fall through */
7473 execve(cmd, argv, envp);
7474 } while (errno == EINTR);
7476 execve(cmd, argv, envp);
7478 if (cmd == (char*) bb_busybox_exec_path) {
7479 /* We already visited ENOEXEC branch below, don't do it again */
7480 //TODO: try execve(initial_argv0_of_shell, argv, envp) before giving up?
7484 if (errno == ENOEXEC) {
7485 /* Run "cmd" as a shell script:
7486 * http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html
7487 * "If the execve() function fails with ENOEXEC, the shell
7488 * shall execute a command equivalent to having a shell invoked
7489 * with the command name as its first operand,
7490 * with any remaining arguments passed to the new shell"
7492 * That is, do not use $SHELL, user's shell, or /bin/sh;
7493 * just call ourselves.
7495 * Note that bash reads ~80 chars of the file, and if it sees
7496 * a zero byte before it sees newline, it doesn't try to
7497 * interpret it, but fails with "cannot execute binary file"
7498 * message and exit code 126. For one, this prevents attempts
7499 * to interpret foreign ELF binaries as shell scripts.
7504 for (ap = argv; *ap; ap++)
7506 new = ckmalloc((ap - argv + 2) * sizeof(new[0]));
7507 new[0] = (char*) "ash";
7510 while ((*ap++ = *++argv) != NULL)
7512 cmd = (char*) bb_busybox_exec_path;
7519 * Exec a program. Never returns. If you change this routine, you may
7520 * have to change the find_command routine as well.
7522 static void shellexec(char **, const char *, int) NORETURN;
7524 shellexec(char **argv, const char *path, int idx)
7530 int applet_no = -1; /* used only by FEATURE_SH_STANDALONE */
7532 clearredir(/*drop:*/ 1);
7533 envp = listvars(VEXPORT, VUNSET, /*end:*/ NULL);
7534 if (strchr(argv[0], '/') != NULL
7535 #if ENABLE_FEATURE_SH_STANDALONE
7536 || (applet_no = find_applet_by_name(argv[0])) >= 0
7539 tryexec(IF_FEATURE_SH_STANDALONE(applet_no,) argv[0], argv, envp);
7540 if (applet_no >= 0) {
7541 /* We tried execing ourself, but it didn't work.
7542 * Maybe /proc/self/exe doesn't exist?
7551 while ((cmdname = path_advance(&path, argv[0])) != NULL) {
7552 if (--idx < 0 && pathopt == NULL) {
7553 tryexec(IF_FEATURE_SH_STANDALONE(-1,) cmdname, argv, envp);
7554 if (errno != ENOENT && errno != ENOTDIR)
7561 /* Map to POSIX errors */
7573 exitstatus = exerrno;
7574 TRACE(("shellexec failed for %s, errno %d, suppress_int %d\n",
7575 argv[0], e, suppress_int));
7576 ash_msg_and_raise(EXEXEC, "%s: %s", argv[0], errmsg(e, "not found"));
7581 printentry(struct tblentry *cmdp)
7587 idx = cmdp->param.index;
7590 name = path_advance(&path, cmdp->cmdname);
7592 } while (--idx >= 0);
7593 out1fmt("%s%s\n", name, (cmdp->rehash ? "*" : nullstr));
7597 * Clear out command entries. The argument specifies the first entry in
7598 * PATH which has changed.
7601 clearcmdentry(int firstchange)
7603 struct tblentry **tblp;
7604 struct tblentry **pp;
7605 struct tblentry *cmdp;
7608 for (tblp = cmdtable; tblp < &cmdtable[CMDTABLESIZE]; tblp++) {
7610 while ((cmdp = *pp) != NULL) {
7611 if ((cmdp->cmdtype == CMDNORMAL &&
7612 cmdp->param.index >= firstchange)
7613 || (cmdp->cmdtype == CMDBUILTIN &&
7614 builtinloc >= firstchange)
7627 * Locate a command in the command hash table. If "add" is nonzero,
7628 * add the command to the table if it is not already present. The
7629 * variable "lastcmdentry" is set to point to the address of the link
7630 * pointing to the entry, so that delete_cmd_entry can delete the
7633 * Interrupts must be off if called with add != 0.
7635 static struct tblentry **lastcmdentry;
7637 static struct tblentry *
7638 cmdlookup(const char *name, int add)
7640 unsigned int hashval;
7642 struct tblentry *cmdp;
7643 struct tblentry **pp;
7646 hashval = (unsigned char)*p << 4;
7648 hashval += (unsigned char)*p++;
7650 pp = &cmdtable[hashval % CMDTABLESIZE];
7651 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7652 if (strcmp(cmdp->cmdname, name) == 0)
7656 if (add && cmdp == NULL) {
7657 cmdp = *pp = ckzalloc(sizeof(struct tblentry)
7659 /* + 1 - already done because
7660 * tblentry::cmdname is char[1] */);
7661 /*cmdp->next = NULL; - ckzalloc did it */
7662 cmdp->cmdtype = CMDUNKNOWN;
7663 strcpy(cmdp->cmdname, name);
7670 * Delete the command entry returned on the last lookup.
7673 delete_cmd_entry(void)
7675 struct tblentry *cmdp;
7678 cmdp = *lastcmdentry;
7679 *lastcmdentry = cmdp->next;
7680 if (cmdp->cmdtype == CMDFUNCTION)
7681 freefunc(cmdp->param.func);
7687 * Add a new command entry, replacing any existing command entry for
7688 * the same name - except special builtins.
7691 addcmdentry(char *name, struct cmdentry *entry)
7693 struct tblentry *cmdp;
7695 cmdp = cmdlookup(name, 1);
7696 if (cmdp->cmdtype == CMDFUNCTION) {
7697 freefunc(cmdp->param.func);
7699 cmdp->cmdtype = entry->cmdtype;
7700 cmdp->param = entry->u;
7704 static int FAST_FUNC
7705 hashcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
7707 struct tblentry **pp;
7708 struct tblentry *cmdp;
7710 struct cmdentry entry;
7713 if (nextopt("r") != '\0') {
7718 if (*argptr == NULL) {
7719 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
7720 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7721 if (cmdp->cmdtype == CMDNORMAL)
7729 while ((name = *argptr) != NULL) {
7730 cmdp = cmdlookup(name, 0);
7732 && (cmdp->cmdtype == CMDNORMAL
7733 || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))
7737 find_command(name, &entry, DO_ERR, pathval());
7738 if (entry.cmdtype == CMDUNKNOWN)
7746 * Called when a cd is done. Marks all commands so the next time they
7747 * are executed they will be rehashed.
7752 struct tblentry **pp;
7753 struct tblentry *cmdp;
7755 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
7756 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7757 if (cmdp->cmdtype == CMDNORMAL
7758 || (cmdp->cmdtype == CMDBUILTIN
7759 && !IS_BUILTIN_REGULAR(cmdp->param.cmd)
7769 * Fix command hash table when PATH changed.
7770 * Called before PATH is changed. The argument is the new value of PATH;
7771 * pathval() still returns the old value at this point.
7772 * Called with interrupts off.
7774 static void FAST_FUNC
7775 changepath(const char *new)
7783 firstchange = 9999; /* assume no change */
7789 if ((*old == '\0' && *new == ':')
7790 || (*old == ':' && *new == '\0')
7794 old = new; /* ignore subsequent differences */
7798 if (*new == '%' && idx_bltin < 0 && prefix(new + 1, "builtin"))
7805 if (builtinloc < 0 && idx_bltin >= 0)
7806 builtinloc = idx_bltin; /* zap builtins */
7807 if (builtinloc >= 0 && idx_bltin < 0)
7809 clearcmdentry(firstchange);
7810 builtinloc = idx_bltin;
7835 #if ENABLE_ASH_BASH_COMPAT
7846 typedef smallint token_id_t;
7848 /* first char is indicating which tokens mark the end of a list */
7849 static const char *const tokname_array[] = {
7863 #define KWDOFFSET 13
7864 /* the following are keywords */
7874 #if ENABLE_ASH_BASH_COMPAT
7886 /* Wrapper around strcmp for qsort/bsearch/... */
7888 pstrcmp(const void *a, const void *b)
7890 return strcmp((char*) a, (*(char**) b) + 1);
7893 static const char *const *
7894 findkwd(const char *s)
7896 return bsearch(s, tokname_array + KWDOFFSET,
7897 ARRAY_SIZE(tokname_array) - KWDOFFSET,
7898 sizeof(tokname_array[0]), pstrcmp);
7902 * Locate and print what a word is...
7905 describe_command(char *command, const char *path, int describe_command_verbose)
7907 struct cmdentry entry;
7908 struct tblentry *cmdp;
7909 #if ENABLE_ASH_ALIAS
7910 const struct alias *ap;
7913 path = path ? path : pathval();
7915 if (describe_command_verbose) {
7919 /* First look at the keywords */
7920 if (findkwd(command)) {
7921 out1str(describe_command_verbose ? " is a shell keyword" : command);
7925 #if ENABLE_ASH_ALIAS
7926 /* Then look at the aliases */
7927 ap = lookupalias(command, 0);
7929 if (!describe_command_verbose) {
7934 out1fmt(" is an alias for %s", ap->val);
7938 /* Then check if it is a tracked alias */
7939 cmdp = cmdlookup(command, 0);
7941 entry.cmdtype = cmdp->cmdtype;
7942 entry.u = cmdp->param;
7944 /* Finally use brute force */
7945 find_command(command, &entry, DO_ABS, path);
7948 switch (entry.cmdtype) {
7950 int j = entry.u.index;
7956 p = path_advance(&path, command);
7960 if (describe_command_verbose) {
7962 (cmdp ? " a tracked alias for" : nullstr), p
7971 if (describe_command_verbose) {
7972 out1str(" is a shell function");
7979 if (describe_command_verbose) {
7980 out1fmt(" is a %sshell builtin",
7981 IS_BUILTIN_SPECIAL(entry.u.cmd) ?
7982 "special " : nullstr
7990 if (describe_command_verbose) {
7991 out1str(": not found\n");
8000 static int FAST_FUNC
8001 typecmd(int argc UNUSED_PARAM, char **argv)
8007 /* type -p ... ? (we don't bother checking for 'p') */
8008 if (argv[1] && argv[1][0] == '-') {
8013 err |= describe_command(argv[i++], NULL, verbose);
8018 #if ENABLE_ASH_CMDCMD
8019 static int FAST_FUNC
8020 commandcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
8027 const char *path = NULL;
8029 while ((c = nextopt("pvV")) != '\0')
8031 verify |= VERIFY_VERBOSE;
8033 verify |= VERIFY_BRIEF;
8039 path = bb_default_path;
8040 /* Mimic bash: just "command -v" doesn't complain, it's a nop */
8041 if (verify && (*argptr != NULL)) {
8042 return describe_command(*argptr, path, verify - VERIFY_BRIEF);
8050 /* ============ eval.c */
8052 static int funcblocksize; /* size of structures in function */
8053 static int funcstringsize; /* size of strings in node */
8054 static void *funcblock; /* block to allocate function from */
8055 static char *funcstring; /* block to allocate strings from */
8057 /* flags in argument to evaltree */
8058 #define EV_EXIT 01 /* exit after evaluating tree */
8059 #define EV_TESTED 02 /* exit status is checked; ignore -e flag */
8060 #define EV_BACKCMD 04 /* command executing within back quotes */
8062 static const uint8_t nodesize[N_NUMBER] ALIGN1 = {
8063 [NCMD ] = SHELL_ALIGN(sizeof(struct ncmd)),
8064 [NPIPE ] = SHELL_ALIGN(sizeof(struct npipe)),
8065 [NREDIR ] = SHELL_ALIGN(sizeof(struct nredir)),
8066 [NBACKGND ] = SHELL_ALIGN(sizeof(struct nredir)),
8067 [NSUBSHELL] = SHELL_ALIGN(sizeof(struct nredir)),
8068 [NAND ] = SHELL_ALIGN(sizeof(struct nbinary)),
8069 [NOR ] = SHELL_ALIGN(sizeof(struct nbinary)),
8070 [NSEMI ] = SHELL_ALIGN(sizeof(struct nbinary)),
8071 [NIF ] = SHELL_ALIGN(sizeof(struct nif)),
8072 [NWHILE ] = SHELL_ALIGN(sizeof(struct nbinary)),
8073 [NUNTIL ] = SHELL_ALIGN(sizeof(struct nbinary)),
8074 [NFOR ] = SHELL_ALIGN(sizeof(struct nfor)),
8075 [NCASE ] = SHELL_ALIGN(sizeof(struct ncase)),
8076 [NCLIST ] = SHELL_ALIGN(sizeof(struct nclist)),
8077 [NDEFUN ] = SHELL_ALIGN(sizeof(struct narg)),
8078 [NARG ] = SHELL_ALIGN(sizeof(struct narg)),
8079 [NTO ] = SHELL_ALIGN(sizeof(struct nfile)),
8080 #if ENABLE_ASH_BASH_COMPAT
8081 [NTO2 ] = SHELL_ALIGN(sizeof(struct nfile)),
8083 [NCLOBBER ] = SHELL_ALIGN(sizeof(struct nfile)),
8084 [NFROM ] = SHELL_ALIGN(sizeof(struct nfile)),
8085 [NFROMTO ] = SHELL_ALIGN(sizeof(struct nfile)),
8086 [NAPPEND ] = SHELL_ALIGN(sizeof(struct nfile)),
8087 [NTOFD ] = SHELL_ALIGN(sizeof(struct ndup)),
8088 [NFROMFD ] = SHELL_ALIGN(sizeof(struct ndup)),
8089 [NHERE ] = SHELL_ALIGN(sizeof(struct nhere)),
8090 [NXHERE ] = SHELL_ALIGN(sizeof(struct nhere)),
8091 [NNOT ] = SHELL_ALIGN(sizeof(struct nnot)),
8094 static void calcsize(union node *n);
8097 sizenodelist(struct nodelist *lp)
8100 funcblocksize += SHELL_ALIGN(sizeof(struct nodelist));
8107 calcsize(union node *n)
8111 funcblocksize += nodesize[n->type];
8114 calcsize(n->ncmd.redirect);
8115 calcsize(n->ncmd.args);
8116 calcsize(n->ncmd.assign);
8119 sizenodelist(n->npipe.cmdlist);
8124 calcsize(n->nredir.redirect);
8125 calcsize(n->nredir.n);
8132 calcsize(n->nbinary.ch2);
8133 calcsize(n->nbinary.ch1);
8136 calcsize(n->nif.elsepart);
8137 calcsize(n->nif.ifpart);
8138 calcsize(n->nif.test);
8141 funcstringsize += strlen(n->nfor.var) + 1;
8142 calcsize(n->nfor.body);
8143 calcsize(n->nfor.args);
8146 calcsize(n->ncase.cases);
8147 calcsize(n->ncase.expr);
8150 calcsize(n->nclist.body);
8151 calcsize(n->nclist.pattern);
8152 calcsize(n->nclist.next);
8156 sizenodelist(n->narg.backquote);
8157 funcstringsize += strlen(n->narg.text) + 1;
8158 calcsize(n->narg.next);
8161 #if ENABLE_ASH_BASH_COMPAT
8168 calcsize(n->nfile.fname);
8169 calcsize(n->nfile.next);
8173 calcsize(n->ndup.vname);
8174 calcsize(n->ndup.next);
8178 calcsize(n->nhere.doc);
8179 calcsize(n->nhere.next);
8182 calcsize(n->nnot.com);
8188 nodeckstrdup(char *s)
8190 char *rtn = funcstring;
8192 strcpy(funcstring, s);
8193 funcstring += strlen(s) + 1;
8197 static union node *copynode(union node *);
8199 static struct nodelist *
8200 copynodelist(struct nodelist *lp)
8202 struct nodelist *start;
8203 struct nodelist **lpp;
8208 funcblock = (char *) funcblock + SHELL_ALIGN(sizeof(struct nodelist));
8209 (*lpp)->n = copynode(lp->n);
8211 lpp = &(*lpp)->next;
8218 copynode(union node *n)
8225 funcblock = (char *) funcblock + nodesize[n->type];
8229 new->ncmd.redirect = copynode(n->ncmd.redirect);
8230 new->ncmd.args = copynode(n->ncmd.args);
8231 new->ncmd.assign = copynode(n->ncmd.assign);
8234 new->npipe.cmdlist = copynodelist(n->npipe.cmdlist);
8235 new->npipe.pipe_backgnd = n->npipe.pipe_backgnd;
8240 new->nredir.redirect = copynode(n->nredir.redirect);
8241 new->nredir.n = copynode(n->nredir.n);
8248 new->nbinary.ch2 = copynode(n->nbinary.ch2);
8249 new->nbinary.ch1 = copynode(n->nbinary.ch1);
8252 new->nif.elsepart = copynode(n->nif.elsepart);
8253 new->nif.ifpart = copynode(n->nif.ifpart);
8254 new->nif.test = copynode(n->nif.test);
8257 new->nfor.var = nodeckstrdup(n->nfor.var);
8258 new->nfor.body = copynode(n->nfor.body);
8259 new->nfor.args = copynode(n->nfor.args);
8262 new->ncase.cases = copynode(n->ncase.cases);
8263 new->ncase.expr = copynode(n->ncase.expr);
8266 new->nclist.body = copynode(n->nclist.body);
8267 new->nclist.pattern = copynode(n->nclist.pattern);
8268 new->nclist.next = copynode(n->nclist.next);
8272 new->narg.backquote = copynodelist(n->narg.backquote);
8273 new->narg.text = nodeckstrdup(n->narg.text);
8274 new->narg.next = copynode(n->narg.next);
8277 #if ENABLE_ASH_BASH_COMPAT
8284 new->nfile.fname = copynode(n->nfile.fname);
8285 new->nfile.fd = n->nfile.fd;
8286 new->nfile.next = copynode(n->nfile.next);
8290 new->ndup.vname = copynode(n->ndup.vname);
8291 new->ndup.dupfd = n->ndup.dupfd;
8292 new->ndup.fd = n->ndup.fd;
8293 new->ndup.next = copynode(n->ndup.next);
8297 new->nhere.doc = copynode(n->nhere.doc);
8298 new->nhere.fd = n->nhere.fd;
8299 new->nhere.next = copynode(n->nhere.next);
8302 new->nnot.com = copynode(n->nnot.com);
8305 new->type = n->type;
8310 * Make a copy of a parse tree.
8312 static struct funcnode *
8313 copyfunc(union node *n)
8318 funcblocksize = offsetof(struct funcnode, n);
8321 blocksize = funcblocksize;
8322 f = ckmalloc(blocksize + funcstringsize);
8323 funcblock = (char *) f + offsetof(struct funcnode, n);
8324 funcstring = (char *) f + blocksize;
8331 * Define a shell function.
8334 defun(char *name, union node *func)
8336 struct cmdentry entry;
8339 entry.cmdtype = CMDFUNCTION;
8340 entry.u.func = copyfunc(func);
8341 addcmdentry(name, &entry);
8345 /* Reasons for skipping commands (see comment on breakcmd routine) */
8346 #define SKIPBREAK (1 << 0)
8347 #define SKIPCONT (1 << 1)
8348 #define SKIPFUNC (1 << 2)
8349 #define SKIPFILE (1 << 3)
8350 #define SKIPEVAL (1 << 4)
8351 static smallint evalskip; /* set to SKIPxxx if we are skipping commands */
8352 static int skipcount; /* number of levels to skip */
8353 static int funcnest; /* depth of function calls */
8354 static int loopnest; /* current loop nesting level */
8356 /* Forward decl way out to parsing code - dotrap needs it */
8357 static int evalstring(char *s, int mask);
8359 /* Called to execute a trap.
8360 * Single callsite - at the end of evaltree().
8361 * If we return non-zero, evaltree raises EXEXIT exception.
8363 * Perhaps we should avoid entering new trap handlers
8364 * while we are executing a trap handler. [is it a TODO?]
8373 savestatus = exitstatus;
8377 TRACE(("dotrap entered\n"));
8378 for (sig = 1, g = gotsig; sig < NSIG; sig++, g++) {
8385 /* non-trapped SIGINT is handled separately by raise_interrupt,
8386 * don't upset it by resetting gotsig[SIGINT-1] */
8387 if (sig == SIGINT && !t)
8390 TRACE(("sig %d is active, will run handler '%s'\n", sig, t));
8394 want_exexit = evalstring(t, SKIPEVAL);
8395 exitstatus = savestatus;
8397 TRACE(("dotrap returns %d\n", want_exexit));
8402 TRACE(("dotrap returns 0\n"));
8406 /* forward declarations - evaluation is fairly recursive business... */
8407 static void evalloop(union node *, int);
8408 static void evalfor(union node *, int);
8409 static void evalcase(union node *, int);
8410 static void evalsubshell(union node *, int);
8411 static void expredir(union node *);
8412 static void evalpipe(union node *, int);
8413 static void evalcommand(union node *, int);
8414 static int evalbltin(const struct builtincmd *, int, char **);
8415 static void prehash(union node *);
8418 * Evaluate a parse tree. The value is left in the global variable
8422 evaltree(union node *n, int flags)
8424 struct jmploc *volatile savehandler = exception_handler;
8425 struct jmploc jmploc;
8427 void (*evalfn)(union node *, int);
8431 SAVE_INT(int_level);
8434 TRACE(("evaltree(NULL) called\n"));
8437 TRACE(("evaltree(%p: %d, %d) called\n", n, n->type, flags));
8439 exception_handler = &jmploc;
8441 int err = setjmp(jmploc.loc);
8443 /* if it was a signal, check for trap handlers */
8444 if (exception_type == EXSIG) {
8445 TRACE(("exception %d (EXSIG) in evaltree, err=%d\n",
8446 exception_type, err));
8449 /* continue on the way out */
8450 TRACE(("exception %d in evaltree, propagating err=%d\n",
8451 exception_type, err));
8452 exception_handler = savehandler;
8453 longjmp(exception_handler->loc, err);
8460 out1fmt("Node type = %d\n", n->type);
8465 evaltree(n->nnot.com, EV_TESTED);
8466 status = !exitstatus;
8469 expredir(n->nredir.redirect);
8470 status = redirectsafe(n->nredir.redirect, REDIR_PUSH);
8472 evaltree(n->nredir.n, flags & EV_TESTED);
8473 status = exitstatus;
8475 popredir(/*drop:*/ 0, /*restore:*/ 0 /* not sure */);
8478 evalfn = evalcommand;
8480 if (eflag && !(flags & EV_TESTED))
8491 evalfn = evalsubshell;
8494 evalfn = evalsubshell;
8507 #error NAND + 1 != NOR
8509 #if NOR + 1 != NSEMI
8510 #error NOR + 1 != NSEMI
8512 unsigned is_or = n->type - NAND;
8515 (flags | ((is_or >> 1) - 1)) & EV_TESTED
8517 if ((!exitstatus) == is_or)
8530 evaltree(n->nif.test, EV_TESTED);
8533 if (exitstatus == 0) {
8537 if (n->nif.elsepart) {
8538 n = n->nif.elsepart;
8543 defun(n->narg.text, n->narg.next);
8547 exitstatus = status;
8552 exception_handler = savehandler;
8555 /* Order of checks below is important:
8556 * signal handlers trigger before exit caused by "set -e".
8558 if (pending_sig && dotrap())
8560 if (checkexit & exitstatus)
8561 evalskip |= SKIPEVAL;
8563 if (flags & EV_EXIT) {
8565 raise_exception(EXEXIT);
8568 RESTORE_INT(int_level);
8569 TRACE(("leaving evaltree (no interrupts)\n"));
8572 #if !defined(__alpha__) || (defined(__GNUC__) && __GNUC__ >= 3)
8575 void evaltreenr(union node *, int) __attribute__ ((alias("evaltree"),__noreturn__));
8578 evalloop(union node *n, int flags)
8588 evaltree(n->nbinary.ch1, EV_TESTED);
8591 if (evalskip == SKIPCONT && --skipcount <= 0) {
8595 if (evalskip == SKIPBREAK && --skipcount <= 0)
8600 if (n->type != NWHILE)
8604 evaltree(n->nbinary.ch2, flags);
8605 status = exitstatus;
8610 exitstatus = status;
8614 evalfor(union node *n, int flags)
8616 struct arglist arglist;
8619 struct stackmark smark;
8621 setstackmark(&smark);
8622 arglist.list = NULL;
8623 arglist.lastp = &arglist.list;
8624 for (argp = n->nfor.args; argp; argp = argp->narg.next) {
8625 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
8630 *arglist.lastp = NULL;
8635 for (sp = arglist.list; sp; sp = sp->next) {
8636 setvar0(n->nfor.var, sp->text);
8637 evaltree(n->nfor.body, flags);
8639 if (evalskip == SKIPCONT && --skipcount <= 0) {
8643 if (evalskip == SKIPBREAK && --skipcount <= 0)
8650 popstackmark(&smark);
8654 evalcase(union node *n, int flags)
8658 struct arglist arglist;
8659 struct stackmark smark;
8661 setstackmark(&smark);
8662 arglist.list = NULL;
8663 arglist.lastp = &arglist.list;
8664 expandarg(n->ncase.expr, &arglist, EXP_TILDE);
8666 for (cp = n->ncase.cases; cp && evalskip == 0; cp = cp->nclist.next) {
8667 for (patp = cp->nclist.pattern; patp; patp = patp->narg.next) {
8668 if (casematch(patp, arglist.list->text)) {
8669 if (evalskip == 0) {
8670 evaltree(cp->nclist.body, flags);
8677 popstackmark(&smark);
8681 * Kick off a subshell to evaluate a tree.
8684 evalsubshell(union node *n, int flags)
8687 int backgnd = (n->type == NBACKGND);
8690 expredir(n->nredir.redirect);
8691 if (!backgnd && (flags & EV_EXIT) && !may_have_traps)
8694 jp = makejob(/*n,*/ 1);
8695 if (forkshell(jp, n, backgnd) == 0) {
8700 flags &= ~EV_TESTED;
8702 redirect(n->nredir.redirect, 0);
8703 evaltreenr(n->nredir.n, flags);
8708 status = waitforjob(jp);
8709 exitstatus = status;
8714 * Compute the names of the files in a redirection list.
8716 static void fixredir(union node *, const char *, int);
8718 expredir(union node *n)
8722 for (redir = n; redir; redir = redir->nfile.next) {
8726 fn.lastp = &fn.list;
8727 switch (redir->type) {
8731 #if ENABLE_ASH_BASH_COMPAT
8736 expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR);
8737 TRACE(("expredir expanded to '%s'\n", fn.list->text));
8738 #if ENABLE_ASH_BASH_COMPAT
8742 // By the design of stack allocator, the loop of this kind:
8743 // while true; do while true; do break; done </dev/null; done
8744 // will look like a memory leak: ash plans to free expfname's
8745 // of "/dev/null" as soon as it finishes running the loop
8746 // (in this case, never).
8747 // This "fix" is wrong:
8748 if (redir->nfile.expfname)
8749 stunalloc(redir->nfile.expfname);
8750 // It results in corrupted state of stacked allocations.
8752 redir->nfile.expfname = fn.list->text;
8755 case NTOFD: /* >& */
8756 if (redir->ndup.vname) {
8757 expandarg(redir->ndup.vname, &fn, EXP_FULL | EXP_TILDE);
8758 if (fn.list == NULL)
8759 ash_msg_and_raise_error("redir error");
8760 #if ENABLE_ASH_BASH_COMPAT
8761 //FIXME: we used expandarg with different args!
8762 if (!isdigit_str9(fn.list->text)) {
8763 /* >&file, not >&fd */
8764 if (redir->nfile.fd != 1) /* 123>&file - BAD */
8765 ash_msg_and_raise_error("redir error");
8767 goto store_expfname;
8770 fixredir(redir, fn.list->text, 1);
8778 * Evaluate a pipeline. All the processes in the pipeline are children
8779 * of the process creating the pipeline. (This differs from some versions
8780 * of the shell, which make the last process in a pipeline the parent
8784 evalpipe(union node *n, int flags)
8787 struct nodelist *lp;
8792 TRACE(("evalpipe(0x%lx) called\n", (long)n));
8794 for (lp = n->npipe.cmdlist; lp; lp = lp->next)
8798 jp = makejob(/*n,*/ pipelen);
8800 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
8804 if (pipe(pip) < 0) {
8806 ash_msg_and_raise_error("pipe call failed");
8809 if (forkshell(jp, lp->n, n->npipe.pipe_backgnd) == 0) {
8822 evaltreenr(lp->n, flags);
8828 /* Don't want to trigger debugging */
8832 if (n->npipe.pipe_backgnd == 0) {
8833 exitstatus = waitforjob(jp);
8834 TRACE(("evalpipe: job done exit status %d\n", exitstatus));
8840 * Controls whether the shell is interactive or not.
8843 setinteractive(int on)
8845 static smallint is_interactive;
8847 if (++on == is_interactive)
8849 is_interactive = on;
8853 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
8854 if (is_interactive > 1) {
8855 /* Looks like they want an interactive shell */
8856 static smallint did_banner;
8859 /* note: ash and hush share this string */
8860 out1fmt("\n\n%s %s\n"
8861 IF_ASH_HELP("Enter 'help' for a list of built-in commands.\n")
8864 "built-in shell (ash)"
8878 setinteractive(iflag);
8880 #if ENABLE_FEATURE_EDITING_VI
8882 line_input_state->flags |= VI_MODE;
8884 line_input_state->flags &= ~VI_MODE;
8886 viflag = 0; /* forcibly keep the option off */
8890 static struct localvar *localvars;
8893 * Called after a function returns.
8894 * Interrupts must be off.
8899 struct localvar *lvp;
8902 while ((lvp = localvars) != NULL) {
8903 localvars = lvp->next;
8905 TRACE(("poplocalvar %s\n", vp ? vp->var_text : "-"));
8906 if (vp == NULL) { /* $- saved */
8907 memcpy(optlist, lvp->text, sizeof(optlist));
8908 free((char*)lvp->text);
8910 } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) {
8911 unsetvar(vp->var_text);
8914 vp->var_func(var_end(lvp->text));
8915 if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
8916 free((char*)vp->var_text);
8917 vp->flags = lvp->flags;
8918 vp->var_text = lvp->text;
8925 evalfun(struct funcnode *func, int argc, char **argv, int flags)
8927 volatile struct shparam saveparam;
8928 struct localvar *volatile savelocalvars;
8929 struct jmploc *volatile savehandler;
8930 struct jmploc jmploc;
8933 saveparam = shellparam;
8934 savelocalvars = localvars;
8935 e = setjmp(jmploc.loc);
8940 savehandler = exception_handler;
8941 exception_handler = &jmploc;
8943 shellparam.malloced = 0;
8947 shellparam.nparam = argc - 1;
8948 shellparam.p = argv + 1;
8949 #if ENABLE_ASH_GETOPTS
8950 shellparam.optind = 1;
8951 shellparam.optoff = -1;
8953 evaltree(&func->n, flags & EV_TESTED);
8959 localvars = savelocalvars;
8960 freeparam(&shellparam);
8961 shellparam = saveparam;
8962 exception_handler = savehandler;
8964 evalskip &= ~SKIPFUNC;
8968 #if ENABLE_ASH_CMDCMD
8970 parse_command_args(char **argv, const char **path)
8983 if (c == '-' && !*cp) {
8991 *path = bb_default_path;
8994 /* run 'typecmd' for other options */
9005 * Make a variable a local variable. When a variable is made local, it's
9006 * value and flags are saved in a localvar structure. The saved values
9007 * will be restored when the shell function returns. We handle the name
9008 * "-" as a special case: it makes changes to "set +-options" local
9009 * (options will be restored on return from the function).
9014 struct localvar *lvp;
9017 char *eq = strchr(name, '=');
9020 /* Cater for duplicate "local". Examples:
9021 * x=0; f() { local x=1; echo $x; local x; echo $x; }; f; echo $x
9022 * x=0; f() { local x=1; echo $x; local x=2; echo $x; }; f; echo $x
9026 if (lvp->vp && varcmp(lvp->vp->var_text, name) == 0) {
9030 * it's a duplicate "local VAR" declaration, do nothing
9037 lvp = ckzalloc(sizeof(*lvp));
9038 if (LONE_DASH(name)) {
9040 p = ckmalloc(sizeof(optlist));
9041 lvp->text = memcpy(p, optlist, sizeof(optlist));
9044 vpp = hashvar(name);
9045 vp = *findvar(vpp, name);
9047 /* variable did not exist yet */
9049 setvareq(name, VSTRFIXED);
9051 setvar(name, NULL, VSTRFIXED);
9052 vp = *vpp; /* the new variable */
9053 lvp->flags = VUNSET;
9055 lvp->text = vp->var_text;
9056 lvp->flags = vp->flags;
9057 /* make sure neither "struct var" nor string gets freed
9058 * during (un)setting:
9060 vp->flags |= VSTRFIXED|VTEXTFIXED;
9064 /* "local VAR" unsets VAR: */
9065 setvar0(name, NULL);
9069 lvp->next = localvars;
9075 * The "local" command.
9077 static int FAST_FUNC
9078 localcmd(int argc UNUSED_PARAM, char **argv)
9083 ash_msg_and_raise_error("not in a function");
9086 while ((name = *argv++) != NULL) {
9092 static int FAST_FUNC
9093 falsecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
9098 static int FAST_FUNC
9099 truecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
9104 static int FAST_FUNC
9105 execcmd(int argc UNUSED_PARAM, char **argv)
9108 iflag = 0; /* exit on error */
9111 /* We should set up signals for "exec CMD"
9112 * the same way as for "CMD" without "exec".
9113 * But optschanged->setinteractive->setsignal
9114 * still thought we are a root shell. Therefore, for example,
9115 * SIGQUIT is still set to IGN. Fix it:
9119 /*setsignal(SIGTERM); - unnecessary because of iflag=0 */
9120 /*setsignal(SIGTSTP); - unnecessary because of mflag=0 */
9121 /*setsignal(SIGTTOU); - unnecessary because of mflag=0 */
9123 shellexec(argv + 1, pathval(), 0);
9130 * The return command.
9132 static int FAST_FUNC
9133 returncmd(int argc UNUSED_PARAM, char **argv)
9136 * If called outside a function, do what ksh does;
9137 * skip the rest of the file.
9139 evalskip = funcnest ? SKIPFUNC : SKIPFILE;
9140 return argv[1] ? number(argv[1]) : exitstatus;
9143 /* Forward declarations for builtintab[] */
9144 static int breakcmd(int, char **) FAST_FUNC;
9145 static int dotcmd(int, char **) FAST_FUNC;
9146 static int evalcmd(int, char **) FAST_FUNC;
9147 static int exitcmd(int, char **) FAST_FUNC;
9148 static int exportcmd(int, char **) FAST_FUNC;
9149 #if ENABLE_ASH_GETOPTS
9150 static int getoptscmd(int, char **) FAST_FUNC;
9153 static int helpcmd(int, char **) FAST_FUNC;
9156 static int historycmd(int, char **) FAST_FUNC;
9158 #if ENABLE_SH_MATH_SUPPORT
9159 static int letcmd(int, char **) FAST_FUNC;
9161 static int readcmd(int, char **) FAST_FUNC;
9162 static int setcmd(int, char **) FAST_FUNC;
9163 static int shiftcmd(int, char **) FAST_FUNC;
9164 static int timescmd(int, char **) FAST_FUNC;
9165 static int trapcmd(int, char **) FAST_FUNC;
9166 static int umaskcmd(int, char **) FAST_FUNC;
9167 static int unsetcmd(int, char **) FAST_FUNC;
9168 static int ulimitcmd(int, char **) FAST_FUNC;
9170 #define BUILTIN_NOSPEC "0"
9171 #define BUILTIN_SPECIAL "1"
9172 #define BUILTIN_REGULAR "2"
9173 #define BUILTIN_SPEC_REG "3"
9174 #define BUILTIN_ASSIGN "4"
9175 #define BUILTIN_SPEC_ASSG "5"
9176 #define BUILTIN_REG_ASSG "6"
9177 #define BUILTIN_SPEC_REG_ASSG "7"
9179 /* Stubs for calling non-FAST_FUNC's */
9180 #if ENABLE_ASH_BUILTIN_ECHO
9181 static int FAST_FUNC echocmd(int argc, char **argv) { return echo_main(argc, argv); }
9183 #if ENABLE_ASH_BUILTIN_PRINTF
9184 static int FAST_FUNC printfcmd(int argc, char **argv) { return printf_main(argc, argv); }
9186 #if ENABLE_ASH_BUILTIN_TEST
9187 static int FAST_FUNC testcmd(int argc, char **argv) { return test_main(argc, argv); }
9190 /* Keep these in proper order since it is searched via bsearch() */
9191 static const struct builtincmd builtintab[] = {
9192 { BUILTIN_SPEC_REG "." , dotcmd },
9193 { BUILTIN_SPEC_REG ":" , truecmd },
9194 #if ENABLE_ASH_BUILTIN_TEST
9195 { BUILTIN_REGULAR "[" , testcmd },
9196 #if ENABLE_ASH_BASH_COMPAT
9197 { BUILTIN_REGULAR "[[" , testcmd },
9200 #if ENABLE_ASH_ALIAS
9201 { BUILTIN_REG_ASSG "alias" , aliascmd },
9204 { BUILTIN_REGULAR "bg" , fg_bgcmd },
9206 { BUILTIN_SPEC_REG "break" , breakcmd },
9207 { BUILTIN_REGULAR "cd" , cdcmd },
9208 { BUILTIN_NOSPEC "chdir" , cdcmd },
9209 #if ENABLE_ASH_CMDCMD
9210 { BUILTIN_REGULAR "command" , commandcmd },
9212 { BUILTIN_SPEC_REG "continue", breakcmd },
9213 #if ENABLE_ASH_BUILTIN_ECHO
9214 { BUILTIN_REGULAR "echo" , echocmd },
9216 { BUILTIN_SPEC_REG "eval" , evalcmd },
9217 { BUILTIN_SPEC_REG "exec" , execcmd },
9218 { BUILTIN_SPEC_REG "exit" , exitcmd },
9219 { BUILTIN_SPEC_REG_ASSG "export" , exportcmd },
9220 { BUILTIN_REGULAR "false" , falsecmd },
9222 { BUILTIN_REGULAR "fg" , fg_bgcmd },
9224 #if ENABLE_ASH_GETOPTS
9225 { BUILTIN_REGULAR "getopts" , getoptscmd },
9227 { BUILTIN_NOSPEC "hash" , hashcmd },
9229 { BUILTIN_NOSPEC "help" , helpcmd },
9232 { BUILTIN_NOSPEC "history" , historycmd },
9235 { BUILTIN_REGULAR "jobs" , jobscmd },
9236 { BUILTIN_REGULAR "kill" , killcmd },
9238 #if ENABLE_SH_MATH_SUPPORT
9239 { BUILTIN_NOSPEC "let" , letcmd },
9241 { BUILTIN_ASSIGN "local" , localcmd },
9242 #if ENABLE_ASH_BUILTIN_PRINTF
9243 { BUILTIN_REGULAR "printf" , printfcmd },
9245 { BUILTIN_NOSPEC "pwd" , pwdcmd },
9246 { BUILTIN_REGULAR "read" , readcmd },
9247 { BUILTIN_SPEC_REG_ASSG "readonly", exportcmd },
9248 { BUILTIN_SPEC_REG "return" , returncmd },
9249 { BUILTIN_SPEC_REG "set" , setcmd },
9250 { BUILTIN_SPEC_REG "shift" , shiftcmd },
9251 #if ENABLE_ASH_BASH_COMPAT
9252 { BUILTIN_SPEC_REG "source" , dotcmd },
9254 #if ENABLE_ASH_BUILTIN_TEST
9255 { BUILTIN_REGULAR "test" , testcmd },
9257 { BUILTIN_SPEC_REG "times" , timescmd },
9258 { BUILTIN_SPEC_REG "trap" , trapcmd },
9259 { BUILTIN_REGULAR "true" , truecmd },
9260 { BUILTIN_NOSPEC "type" , typecmd },
9261 { BUILTIN_NOSPEC "ulimit" , ulimitcmd },
9262 { BUILTIN_REGULAR "umask" , umaskcmd },
9263 #if ENABLE_ASH_ALIAS
9264 { BUILTIN_REGULAR "unalias" , unaliascmd },
9266 { BUILTIN_SPEC_REG "unset" , unsetcmd },
9267 { BUILTIN_REGULAR "wait" , waitcmd },
9270 /* Should match the above table! */
9271 #define COMMANDCMD (builtintab + \
9273 1 * ENABLE_ASH_BUILTIN_TEST + \
9274 1 * ENABLE_ASH_BUILTIN_TEST * ENABLE_ASH_BASH_COMPAT + \
9275 1 * ENABLE_ASH_ALIAS + \
9276 1 * ENABLE_ASH_JOB_CONTROL + \
9278 #define EXECCMD (builtintab + \
9280 1 * ENABLE_ASH_BUILTIN_TEST + \
9281 1 * ENABLE_ASH_BUILTIN_TEST * ENABLE_ASH_BASH_COMPAT + \
9282 1 * ENABLE_ASH_ALIAS + \
9283 1 * ENABLE_ASH_JOB_CONTROL + \
9285 1 * ENABLE_ASH_CMDCMD + \
9287 ENABLE_ASH_BUILTIN_ECHO + \
9291 * Search the table of builtin commands.
9293 static struct builtincmd *
9294 find_builtin(const char *name)
9296 struct builtincmd *bp;
9299 name, builtintab, ARRAY_SIZE(builtintab), sizeof(builtintab[0]),
9306 * Execute a simple command.
9309 isassignment(const char *p)
9311 const char *q = endofname(p);
9316 static int FAST_FUNC
9317 bltincmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
9319 /* Preserve exitstatus of a previous possible redirection
9320 * as POSIX mandates */
9321 return back_exitstatus;
9324 evalcommand(union node *cmd, int flags)
9326 static const struct builtincmd null_bltin = {
9327 "\0\0", bltincmd /* why three NULs? */
9329 struct stackmark smark;
9331 struct arglist arglist;
9332 struct arglist varlist;
9335 const struct strlist *sp;
9336 struct cmdentry cmdentry;
9343 struct builtincmd *bcmd;
9344 smallint cmd_is_exec;
9345 smallint pseudovarflag = 0;
9347 /* First expand the arguments. */
9348 TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags));
9349 setstackmark(&smark);
9350 back_exitstatus = 0;
9352 cmdentry.cmdtype = CMDBUILTIN;
9353 cmdentry.u.cmd = &null_bltin;
9354 varlist.lastp = &varlist.list;
9355 *varlist.lastp = NULL;
9356 arglist.lastp = &arglist.list;
9357 *arglist.lastp = NULL;
9360 if (cmd->ncmd.args) {
9361 bcmd = find_builtin(cmd->ncmd.args->narg.text);
9362 pseudovarflag = bcmd && IS_BUILTIN_ASSIGN(bcmd);
9365 for (argp = cmd->ncmd.args; argp; argp = argp->narg.next) {
9366 struct strlist **spp;
9368 spp = arglist.lastp;
9369 if (pseudovarflag && isassignment(argp->narg.text))
9370 expandarg(argp, &arglist, EXP_VARTILDE);
9372 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
9374 for (sp = *spp; sp; sp = sp->next)
9378 argv = nargv = stalloc(sizeof(char *) * (argc + 1));
9379 for (sp = arglist.list; sp; sp = sp->next) {
9380 TRACE(("evalcommand arg: %s\n", sp->text));
9381 *nargv++ = sp->text;
9386 if (iflag && funcnest == 0 && argc > 0)
9387 lastarg = nargv[-1];
9390 expredir(cmd->ncmd.redirect);
9391 status = redirectsafe(cmd->ncmd.redirect, REDIR_PUSH | REDIR_SAVEFD2);
9393 path = vpath.var_text;
9394 for (argp = cmd->ncmd.assign; argp; argp = argp->narg.next) {
9395 struct strlist **spp;
9398 spp = varlist.lastp;
9399 expandarg(argp, &varlist, EXP_VARTILDE);
9402 * Modify the command lookup path, if a PATH= assignment
9406 if (varcmp(p, path) == 0)
9410 /* Print the command if xflag is set. */
9413 const char *p = " %s" + 1;
9415 fdprintf(preverrout_fd, p, expandstr(ps4val()));
9417 for (n = 0; n < 2; n++) {
9419 fdprintf(preverrout_fd, p, sp->text);
9425 safe_write(preverrout_fd, "\n", 1);
9431 /* Now locate the command. */
9433 int cmd_flag = DO_ERR;
9434 #if ENABLE_ASH_CMDCMD
9435 const char *oldpath = path + 5;
9439 find_command(argv[0], &cmdentry, cmd_flag, path);
9440 if (cmdentry.cmdtype == CMDUNKNOWN) {
9441 flush_stdout_stderr();
9446 /* implement bltin and command here */
9447 if (cmdentry.cmdtype != CMDBUILTIN)
9450 spclbltin = IS_BUILTIN_SPECIAL(cmdentry.u.cmd);
9451 if (cmdentry.u.cmd == EXECCMD)
9453 #if ENABLE_ASH_CMDCMD
9454 if (cmdentry.u.cmd == COMMANDCMD) {
9456 nargv = parse_command_args(argv, &path);
9459 argc -= nargv - argv;
9461 cmd_flag |= DO_NOFUNC;
9469 /* We have a redirection error. */
9471 raise_exception(EXERROR);
9473 exitstatus = status;
9477 /* Execute the command. */
9478 switch (cmdentry.cmdtype) {
9481 #if ENABLE_FEATURE_SH_NOFORK
9482 /* (1) BUG: if variables are set, we need to fork, or save/restore them
9483 * around run_nofork_applet() call.
9484 * (2) Should this check also be done in forkshell()?
9485 * (perhaps it should, so that "VAR=VAL nofork" at least avoids exec...)
9487 /* find_command() encodes applet_no as (-2 - applet_no) */
9488 int applet_no = (- cmdentry.u.index - 2);
9489 if (applet_no >= 0 && APPLET_IS_NOFORK(applet_no)) {
9490 listsetvar(varlist.list, VEXPORT|VSTACK);
9491 /* run <applet>_main() */
9492 exitstatus = run_nofork_applet(applet_no, argv);
9496 /* Can we avoid forking off? For example, very last command
9497 * in a script or a subshell does not need forking,
9498 * we can just exec it.
9500 if (!(flags & EV_EXIT) || may_have_traps) {
9501 /* No, forking off a child is necessary */
9503 jp = makejob(/*cmd,*/ 1);
9504 if (forkshell(jp, cmd, FORK_FG) != 0) {
9506 exitstatus = waitforjob(jp);
9508 TRACE(("forked child exited with %d\n", exitstatus));
9513 /* fall through to exec'ing external program */
9515 listsetvar(varlist.list, VEXPORT|VSTACK);
9516 shellexec(argv, path, cmdentry.u.index);
9520 cmdenviron = varlist.list;
9522 struct strlist *list = cmdenviron;
9524 if (spclbltin > 0 || argc == 0) {
9526 if (cmd_is_exec && argc > 1)
9529 listsetvar(list, i);
9531 /* Tight loop with builtins only:
9532 * "while kill -0 $child; do true; done"
9533 * will never exit even if $child died, unless we do this
9534 * to reap the zombie and make kill detect that it's gone: */
9535 dowait(DOWAIT_NONBLOCK, NULL);
9537 if (evalbltin(cmdentry.u.cmd, argc, argv)) {
9539 int i = exception_type;
9540 if (i == EXEXIT || i == EXEXEC)
9544 exit_status = 128 + SIGINT;
9546 exit_status = 128 + pending_sig;
9547 exitstatus = exit_status;
9548 if (i == EXINT || spclbltin > 0) {
9550 longjmp(exception_handler->loc, 1);
9557 listsetvar(varlist.list, 0);
9558 /* See above for the rationale */
9559 dowait(DOWAIT_NONBLOCK, NULL);
9560 if (evalfun(cmdentry.u.func, argc, argv, flags))
9566 popredir(/*drop:*/ cmd_is_exec, /*restore:*/ cmd_is_exec);
9568 /* dsl: I think this is intended to be used to support
9569 * '_' in 'vi' command mode during line editing...
9570 * However I implemented that within libedit itself.
9572 setvar0("_", lastarg);
9574 popstackmark(&smark);
9578 evalbltin(const struct builtincmd *cmd, int argc, char **argv)
9580 char *volatile savecmdname;
9581 struct jmploc *volatile savehandler;
9582 struct jmploc jmploc;
9585 savecmdname = commandname;
9586 i = setjmp(jmploc.loc);
9589 savehandler = exception_handler;
9590 exception_handler = &jmploc;
9591 commandname = argv[0];
9593 optptr = NULL; /* initialize nextopt */
9594 exitstatus = (*cmd->builtin)(argc, argv);
9595 flush_stdout_stderr();
9597 exitstatus |= ferror(stdout);
9599 commandname = savecmdname;
9600 exception_handler = savehandler;
9606 goodname(const char *p)
9608 return endofname(p)[0] == '\0';
9613 * Search for a command. This is called before we fork so that the
9614 * location of the command will be available in the parent as well as
9615 * the child. The check for "goodname" is an overly conservative
9616 * check that the name will not be subject to expansion.
9619 prehash(union node *n)
9621 struct cmdentry entry;
9623 if (n->type == NCMD && n->ncmd.args && goodname(n->ncmd.args->narg.text))
9624 find_command(n->ncmd.args->narg.text, &entry, 0, pathval());
9628 /* ============ Builtin commands
9630 * Builtin commands whose functions are closely tied to evaluation
9631 * are implemented here.
9635 * Handle break and continue commands. Break, continue, and return are
9636 * all handled by setting the evalskip flag. The evaluation routines
9637 * above all check this flag, and if it is set they start skipping
9638 * commands rather than executing them. The variable skipcount is
9639 * the number of loops to break/continue, or the number of function
9640 * levels to return. (The latter is always 1.) It should probably
9641 * be an error to break out of more loops than exist, but it isn't
9642 * in the standard shell so we don't make it one here.
9644 static int FAST_FUNC
9645 breakcmd(int argc UNUSED_PARAM, char **argv)
9647 int n = argv[1] ? number(argv[1]) : 1;
9650 ash_msg_and_raise_error(msg_illnum, argv[1]);
9654 evalskip = (**argv == 'c') ? SKIPCONT : SKIPBREAK;
9661 /* ============ input.c
9663 * This implements the input routines used by the parser.
9667 INPUT_PUSH_FILE = 1,
9668 INPUT_NOFILE_OK = 2,
9671 static smallint checkkwd;
9672 /* values of checkkwd variable */
9673 #define CHKALIAS 0x1
9678 * Push a string back onto the input at this current parsefile level.
9679 * We handle aliases this way.
9681 #if !ENABLE_ASH_ALIAS
9682 #define pushstring(s, ap) pushstring(s)
9685 pushstring(char *s, struct alias *ap)
9692 if (g_parsefile->strpush) {
9693 sp = ckzalloc(sizeof(*sp));
9694 sp->prev = g_parsefile->strpush;
9696 sp = &(g_parsefile->basestrpush);
9698 g_parsefile->strpush = sp;
9699 sp->prev_string = g_parsefile->next_to_pgetc;
9700 sp->prev_left_in_line = g_parsefile->left_in_line;
9701 #if ENABLE_ASH_ALIAS
9704 ap->flag |= ALIASINUSE;
9708 g_parsefile->next_to_pgetc = s;
9709 g_parsefile->left_in_line = len;
9716 struct strpush *sp = g_parsefile->strpush;
9719 #if ENABLE_ASH_ALIAS
9721 if (g_parsefile->next_to_pgetc[-1] == ' '
9722 || g_parsefile->next_to_pgetc[-1] == '\t'
9724 checkkwd |= CHKALIAS;
9726 if (sp->string != sp->ap->val) {
9729 sp->ap->flag &= ~ALIASINUSE;
9730 if (sp->ap->flag & ALIASDEAD) {
9731 unalias(sp->ap->name);
9735 g_parsefile->next_to_pgetc = sp->prev_string;
9736 g_parsefile->left_in_line = sp->prev_left_in_line;
9737 g_parsefile->strpush = sp->prev;
9738 if (sp != &(g_parsefile->basestrpush))
9743 //FIXME: BASH_COMPAT with "...&" does TWO pungetc():
9744 //it peeks whether it is &>, and then pushes back both chars.
9745 //This function needs to save last *next_to_pgetc to buf[0]
9746 //to make two pungetc() reliable. Currently,
9747 // pgetc (out of buf: does preadfd), pgetc, pungetc, pungetc won't work...
9752 char *buf = g_parsefile->buf;
9754 g_parsefile->next_to_pgetc = buf;
9755 #if ENABLE_FEATURE_EDITING
9757 if (!iflag || g_parsefile->pf_fd != STDIN_FILENO)
9758 nr = nonblock_immune_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1);
9761 # if ENABLE_ASH_IDLE_TIMEOUT
9763 const char *tmout_var = lookupvar("TMOUT");
9765 timeout = atoi(tmout_var) * 1000;
9771 # if ENABLE_FEATURE_TAB_COMPLETION
9772 line_input_state->path_lookup = pathval();
9774 reinit_unicode_for_ash();
9775 nr = read_line_input(line_input_state, cmdedit_prompt, buf, IBUFSIZ, timeout);
9777 /* Ctrl+C pressed */
9788 /* Ctrl+D pressed */
9791 # if ENABLE_ASH_IDLE_TIMEOUT
9792 else if (errno == EAGAIN && timeout > 0) {
9793 puts("\007timed out waiting for input: auto-logout");
9800 nr = nonblock_immune_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1);
9803 #if 0 /* disabled: nonblock_immune_read() handles this problem */
9805 if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
9806 int flags = fcntl(0, F_GETFL);
9807 if (flags >= 0 && (flags & O_NONBLOCK)) {
9808 flags &= ~O_NONBLOCK;
9809 if (fcntl(0, F_SETFL, flags) >= 0) {
9810 out2str("sh: turning off NDELAY mode\n");
9821 * Refill the input buffer and return the next input character:
9823 * 1) If a string was pushed back on the input, pop it;
9824 * 2) If an EOF was pushed back (g_parsefile->left_in_line < -BIGNUM)
9825 * or we are reading from a string so we can't refill the buffer,
9827 * 3) If there is more stuff in this buffer, use it else call read to fill it.
9828 * 4) Process input up to the next newline, deleting nul characters.
9830 //#define pgetc_debug(...) bb_error_msg(__VA_ARGS__)
9831 #define pgetc_debug(...) ((void)0)
9838 while (g_parsefile->strpush) {
9839 #if ENABLE_ASH_ALIAS
9840 if (g_parsefile->left_in_line == -1
9841 && g_parsefile->strpush->ap
9842 && g_parsefile->next_to_pgetc[-1] != ' '
9843 && g_parsefile->next_to_pgetc[-1] != '\t'
9845 pgetc_debug("preadbuffer PEOA");
9850 /* try "pgetc" now: */
9851 pgetc_debug("preadbuffer internal pgetc at %d:%p'%s'",
9852 g_parsefile->left_in_line,
9853 g_parsefile->next_to_pgetc,
9854 g_parsefile->next_to_pgetc);
9855 if (--g_parsefile->left_in_line >= 0)
9856 return (unsigned char)(*g_parsefile->next_to_pgetc++);
9858 /* on both branches above g_parsefile->left_in_line < 0.
9859 * "pgetc" needs refilling.
9862 /* -90 is our -BIGNUM. Below we use -99 to mark "EOF on read",
9863 * pungetc() may increment it a few times.
9864 * Assuming it won't increment it to less than -90.
9866 if (g_parsefile->left_in_line < -90 || g_parsefile->buf == NULL) {
9867 pgetc_debug("preadbuffer PEOF1");
9868 /* even in failure keep left_in_line and next_to_pgetc
9869 * in lock step, for correct multi-layer pungetc.
9870 * left_in_line was decremented before preadbuffer(),
9871 * must inc next_to_pgetc: */
9872 g_parsefile->next_to_pgetc++;
9876 more = g_parsefile->left_in_buffer;
9878 flush_stdout_stderr();
9882 /* don't try reading again */
9883 g_parsefile->left_in_line = -99;
9884 pgetc_debug("preadbuffer PEOF2");
9885 g_parsefile->next_to_pgetc++;
9890 /* Find out where's the end of line.
9891 * Set g_parsefile->left_in_line
9892 * and g_parsefile->left_in_buffer acordingly.
9893 * NUL chars are deleted.
9895 q = g_parsefile->next_to_pgetc;
9903 memmove(q, q + 1, more);
9907 g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1;
9913 g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1;
9914 if (g_parsefile->left_in_line < 0)
9919 g_parsefile->left_in_buffer = more;
9924 out2str(g_parsefile->next_to_pgetc);
9928 pgetc_debug("preadbuffer at %d:%p'%s'",
9929 g_parsefile->left_in_line,
9930 g_parsefile->next_to_pgetc,
9931 g_parsefile->next_to_pgetc);
9932 return (unsigned char)*g_parsefile->next_to_pgetc++;
9935 #define pgetc_as_macro() \
9936 (--g_parsefile->left_in_line >= 0 \
9937 ? (unsigned char)*g_parsefile->next_to_pgetc++ \
9944 pgetc_debug("pgetc_fast at %d:%p'%s'",
9945 g_parsefile->left_in_line,
9946 g_parsefile->next_to_pgetc,
9947 g_parsefile->next_to_pgetc);
9948 return pgetc_as_macro();
9951 #if ENABLE_ASH_OPTIMIZE_FOR_SIZE
9952 # define pgetc_fast() pgetc()
9954 # define pgetc_fast() pgetc_as_macro()
9957 #if ENABLE_ASH_ALIAS
9959 pgetc_without_PEOA(void)
9963 pgetc_debug("pgetc_fast at %d:%p'%s'",
9964 g_parsefile->left_in_line,
9965 g_parsefile->next_to_pgetc,
9966 g_parsefile->next_to_pgetc);
9968 } while (c == PEOA);
9972 # define pgetc_without_PEOA() pgetc()
9976 * Read a line from the script.
9979 pfgets(char *line, int len)
9985 while (--nleft > 0) {
9986 c = pgetc_without_PEOA();
10001 * Undo the last call to pgetc. Only one character may be pushed back.
10002 * PEOF may be pushed back.
10007 g_parsefile->left_in_line++;
10008 g_parsefile->next_to_pgetc--;
10009 pgetc_debug("pushed back to %d:%p'%s'",
10010 g_parsefile->left_in_line,
10011 g_parsefile->next_to_pgetc,
10012 g_parsefile->next_to_pgetc);
10016 * To handle the "." command, a stack of input files is used. Pushfile
10017 * adds a new entry to the stack and popfile restores the previous level.
10022 struct parsefile *pf;
10024 pf = ckzalloc(sizeof(*pf));
10025 pf->prev = g_parsefile;
10027 /*pf->strpush = NULL; - ckzalloc did it */
10028 /*pf->basestrpush.prev = NULL;*/
10035 struct parsefile *pf = g_parsefile;
10038 if (pf->pf_fd >= 0)
10041 while (pf->strpush)
10043 g_parsefile = pf->prev;
10049 * Return to top level.
10054 while (g_parsefile != &basepf)
10059 * Close the file(s) that the shell is reading commands from. Called
10060 * after a fork is done.
10066 if (g_parsefile->pf_fd > 0) {
10067 close(g_parsefile->pf_fd);
10068 g_parsefile->pf_fd = 0;
10073 * Like setinputfile, but takes an open file descriptor. Call this with
10077 setinputfd(int fd, int push)
10079 close_on_exec_on(fd);
10082 g_parsefile->buf = NULL;
10084 g_parsefile->pf_fd = fd;
10085 if (g_parsefile->buf == NULL)
10086 g_parsefile->buf = ckmalloc(IBUFSIZ);
10087 g_parsefile->left_in_buffer = 0;
10088 g_parsefile->left_in_line = 0;
10089 g_parsefile->linno = 1;
10093 * Set the input to take input from a file. If push is set, push the
10094 * old input onto the stack first.
10097 setinputfile(const char *fname, int flags)
10103 fd = open(fname, O_RDONLY);
10105 if (flags & INPUT_NOFILE_OK)
10107 ash_msg_and_raise_error("can't open '%s'", fname);
10110 fd2 = copyfd(fd, 10);
10113 ash_msg_and_raise_error("out of file descriptors");
10116 setinputfd(fd, flags & INPUT_PUSH_FILE);
10123 * Like setinputfile, but takes input from a string.
10126 setinputstring(char *string)
10130 g_parsefile->next_to_pgetc = string;
10131 g_parsefile->left_in_line = strlen(string);
10132 g_parsefile->buf = NULL;
10133 g_parsefile->linno = 1;
10138 /* ============ mail.c
10140 * Routines to check for mail.
10143 #if ENABLE_ASH_MAIL
10145 /* Hash of mtimes of mailboxes */
10146 static unsigned mailtime_hash;
10147 /* Set if MAIL or MAILPATH is changed. */
10148 static smallint mail_var_path_changed;
10151 * Print appropriate message(s) if mail has arrived.
10152 * If mail_var_path_changed is set,
10153 * then the value of MAIL has mail_var_path_changed,
10154 * so we just update the values.
10163 struct stackmark smark;
10166 setstackmark(&smark);
10167 mpath = mpathset() ? mpathval() : mailval();
10170 p = path_advance(&mpath, nullstr);
10175 for (q = p; *q; q++)
10181 q[-1] = '\0'; /* delete trailing '/' */
10182 if (stat(p, &statb) < 0) {
10185 /* Very simplistic "hash": just a sum of all mtimes */
10186 new_hash += (unsigned)statb.st_mtime;
10188 if (!mail_var_path_changed && mailtime_hash != new_hash) {
10189 if (mailtime_hash != 0)
10190 out2str("you have mail\n");
10191 mailtime_hash = new_hash;
10193 mail_var_path_changed = 0;
10194 popstackmark(&smark);
10197 static void FAST_FUNC
10198 changemail(const char *val UNUSED_PARAM)
10200 mail_var_path_changed = 1;
10203 #endif /* ASH_MAIL */
10206 /* ============ ??? */
10209 * Set the shell parameters.
10212 setparam(char **argv)
10218 for (nparam = 0; argv[nparam]; nparam++)
10220 ap = newparam = ckmalloc((nparam + 1) * sizeof(*ap));
10222 *ap++ = ckstrdup(*argv++);
10225 freeparam(&shellparam);
10226 shellparam.malloced = 1;
10227 shellparam.nparam = nparam;
10228 shellparam.p = newparam;
10229 #if ENABLE_ASH_GETOPTS
10230 shellparam.optind = 1;
10231 shellparam.optoff = -1;
10236 * Process shell options. The global variable argptr contains a pointer
10237 * to the argument list; we advance it past the options.
10239 * SUSv3 section 2.8.1 "Consequences of Shell Errors" says:
10240 * For a non-interactive shell, an error condition encountered
10241 * by a special built-in ... shall cause the shell to write a diagnostic message
10242 * to standard error and exit as shown in the following table:
10243 * Error Special Built-In
10245 * Utility syntax error (option or operand error) Shall exit
10247 * However, in bug 1142 (http://busybox.net/bugs/view.php?id=1142)
10248 * we see that bash does not do that (set "finishes" with error code 1 instead,
10249 * and shell continues), and people rely on this behavior!
10251 * set -o barfoo 2>/dev/null
10254 * Oh well. Let's mimic that.
10257 plus_minus_o(char *name, int val)
10262 for (i = 0; i < NOPTS; i++) {
10263 if (strcmp(name, optnames(i)) == 0) {
10268 ash_msg("illegal option %co %s", val ? '-' : '+', name);
10271 for (i = 0; i < NOPTS; i++) {
10273 out1fmt("%-16s%s\n", optnames(i), optlist[i] ? "on" : "off");
10275 out1fmt("set %co %s\n", optlist[i] ? '-' : '+', optnames(i));
10281 setoption(int flag, int val)
10285 for (i = 0; i < NOPTS; i++) {
10286 if (optletters(i) == flag) {
10291 ash_msg_and_raise_error("illegal option %c%c", val ? '-' : '+', flag);
10295 options(int cmdline)
10303 while ((p = *argptr) != NULL) {
10305 if (c != '-' && c != '+')
10308 val = 0; /* val = 0 if c == '+' */
10311 if (p[0] == '\0' || LONE_DASH(p)) {
10313 /* "-" means turn off -x and -v */
10316 /* "--" means reset params */
10317 else if (*argptr == NULL)
10320 break; /* "-" or "--" terminates options */
10323 /* first char was + or - */
10324 while ((c = *p++) != '\0') {
10325 /* bash 3.2 indeed handles -c CMD and +c CMD the same */
10326 if (c == 'c' && cmdline) {
10327 minusc = p; /* command is after shell args */
10328 } else if (c == 'o') {
10329 if (plus_minus_o(*argptr, val)) {
10330 /* it already printed err message */
10331 return 1; /* error */
10335 } else if (cmdline && (c == 'l')) { /* -l or +l == --login */
10337 /* bash does not accept +-login, we also won't */
10338 } else if (cmdline && val && (c == '-')) { /* long options */
10339 if (strcmp(p, "login") == 0)
10351 * The shift builtin command.
10353 static int FAST_FUNC
10354 shiftcmd(int argc UNUSED_PARAM, char **argv)
10361 n = number(argv[1]);
10362 if (n > shellparam.nparam)
10363 n = 0; /* bash compat, was = shellparam.nparam; */
10365 shellparam.nparam -= n;
10366 for (ap1 = shellparam.p; --n >= 0; ap1++) {
10367 if (shellparam.malloced)
10370 ap2 = shellparam.p;
10371 while ((*ap2++ = *ap1++) != NULL)
10373 #if ENABLE_ASH_GETOPTS
10374 shellparam.optind = 1;
10375 shellparam.optoff = -1;
10382 * POSIX requires that 'set' (but not export or readonly) output the
10383 * variables in lexicographic order - by the locale's collating order (sigh).
10384 * Maybe we could keep them in an ordered balanced binary tree
10385 * instead of hashed lists.
10386 * For now just roll 'em through qsort for printing...
10389 showvars(const char *sep_prefix, int on, int off)
10392 char **ep, **epend;
10394 ep = listvars(on, off, &epend);
10395 qsort(ep, epend - ep, sizeof(char *), vpcmp);
10397 sep = *sep_prefix ? " " : sep_prefix;
10399 for (; ep < epend; ep++) {
10403 p = strchrnul(*ep, '=');
10406 q = single_quote(++p);
10407 out1fmt("%s%s%.*s%s\n", sep_prefix, sep, (int)(p - *ep), *ep, q);
10413 * The set command builtin.
10415 static int FAST_FUNC
10416 setcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
10421 return showvars(nullstr, 0, VUNSET);
10424 retval = options(/*cmdline:*/ 0);
10425 if (retval == 0) { /* if no parse error... */
10427 if (*argptr != NULL) {
10435 #if ENABLE_ASH_RANDOM_SUPPORT
10436 static void FAST_FUNC
10437 change_random(const char *value)
10441 if (value == NULL) {
10442 /* "get", generate */
10443 t = next_random(&random_gen);
10444 /* set without recursion */
10445 setvar(vrandom.var_text, utoa(t), VNOFUNC);
10446 vrandom.flags &= ~VNOFUNC;
10449 t = strtoul(value, NULL, 10);
10450 INIT_RANDOM_T(&random_gen, (t ? t : 1), t);
10455 #if ENABLE_ASH_GETOPTS
10457 getopts(char *optstr, char *optvar, char **optfirst, int *param_optind, int *optoff)
10468 if (*param_optind < 1)
10470 optnext = optfirst + *param_optind - 1;
10472 if (*param_optind <= 1 || *optoff < 0 || (int)strlen(optnext[-1]) < *optoff)
10475 p = optnext[-1] + *optoff;
10476 if (p == NULL || *p == '\0') {
10477 /* Current word is done, advance */
10479 if (p == NULL || *p != '-' || *++p == '\0') {
10486 if (LONE_DASH(p)) /* check for "--" */
10491 for (q = optstr; *q != c;) {
10493 if (optstr[0] == ':') {
10495 /*sbuf[1] = '\0'; - already is */
10496 err |= setvarsafe("OPTARG", sbuf, 0);
10498 fprintf(stderr, "Illegal option -%c\n", c);
10499 unsetvar("OPTARG");
10509 if (*p == '\0' && (p = *optnext) == NULL) {
10510 if (optstr[0] == ':') {
10512 /*sbuf[1] = '\0'; - already is */
10513 err |= setvarsafe("OPTARG", sbuf, 0);
10516 fprintf(stderr, "No arg for -%c option\n", c);
10517 unsetvar("OPTARG");
10525 err |= setvarsafe("OPTARG", p, 0);
10528 err |= setvarsafe("OPTARG", nullstr, 0);
10530 *optoff = p ? p - *(optnext - 1) : -1;
10531 *param_optind = optnext - optfirst + 1;
10532 err |= setvarsafe("OPTIND", itoa(*param_optind), VNOFUNC);
10534 /*sbuf[1] = '\0'; - already is */
10535 err |= setvarsafe(optvar, sbuf, 0);
10539 flush_stdout_stderr();
10540 raise_exception(EXERROR);
10546 * The getopts builtin. Shellparam.optnext points to the next argument
10547 * to be processed. Shellparam.optptr points to the next character to
10548 * be processed in the current argument. If shellparam.optnext is NULL,
10549 * then it's the first time getopts has been called.
10551 static int FAST_FUNC
10552 getoptscmd(int argc, char **argv)
10557 ash_msg_and_raise_error("usage: getopts optstring var [arg]");
10559 optbase = shellparam.p;
10560 if (shellparam.optind > shellparam.nparam + 1) {
10561 shellparam.optind = 1;
10562 shellparam.optoff = -1;
10565 optbase = &argv[3];
10566 if (shellparam.optind > argc - 2) {
10567 shellparam.optind = 1;
10568 shellparam.optoff = -1;
10572 return getopts(argv[1], argv[2], optbase, &shellparam.optind,
10573 &shellparam.optoff);
10575 #endif /* ASH_GETOPTS */
10578 /* ============ Shell parser */
10581 struct heredoc *next; /* next here document in list */
10582 union node *here; /* redirection node */
10583 char *eofmark; /* string indicating end of input */
10584 smallint striptabs; /* if set, strip leading tabs */
10587 static smallint tokpushback; /* last token pushed back */
10588 static smallint quoteflag; /* set if (part of) last token was quoted */
10589 static token_id_t lasttoken; /* last token read (integer id Txxx) */
10590 static struct heredoc *heredoclist; /* list of here documents to read */
10591 static char *wordtext; /* text of last word returned by readtoken */
10592 static struct nodelist *backquotelist;
10593 static union node *redirnode;
10594 static struct heredoc *heredoc;
10596 static const char *
10597 tokname(char *buf, int tok)
10600 return tokname_array[tok] + 1;
10601 sprintf(buf, "\"%s\"", tokname_array[tok] + 1);
10605 /* raise_error_unexpected_syntax:
10606 * Called when an unexpected token is read during the parse. The argument
10607 * is the token that is expected, or -1 if more than one type of token can
10608 * occur at this point.
10610 static void raise_error_unexpected_syntax(int) NORETURN;
10612 raise_error_unexpected_syntax(int token)
10618 l = sprintf(msg, "unexpected %s", tokname(buf, lasttoken));
10620 sprintf(msg + l, " (expecting %s)", tokname(buf, token));
10621 raise_error_syntax(msg);
10625 #define EOFMARKLEN 79
10627 /* parsing is heavily cross-recursive, need these forward decls */
10628 static union node *andor(void);
10629 static union node *pipeline(void);
10630 static union node *parse_command(void);
10631 static void parseheredoc(void);
10632 static int peektoken(void);
10633 static int readtoken(void);
10635 static union node *
10638 union node *n1, *n2, *n3;
10643 switch (peektoken()) {
10651 if (!n1 && (nlflag & 1))
10657 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10658 if (nlflag == 2 && tokname_array[peektoken()][0])
10664 if (tok == TBACKGND) {
10665 if (n2->type == NPIPE) {
10666 n2->npipe.pipe_backgnd = 1;
10668 if (n2->type != NREDIR) {
10669 n3 = stzalloc(sizeof(struct nredir));
10671 /*n3->nredir.redirect = NULL; - stzalloc did it */
10674 n2->type = NBACKGND;
10680 n3 = stzalloc(sizeof(struct nbinary));
10682 n3->nbinary.ch1 = n1;
10683 n3->nbinary.ch2 = n2;
10696 raise_error_unexpected_syntax(-1);
10703 static union node *
10706 union node *n1, *n2, *n3;
10714 } else if (t == TOR) {
10720 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10722 n3 = stzalloc(sizeof(struct nbinary));
10724 n3->nbinary.ch1 = n1;
10725 n3->nbinary.ch2 = n2;
10730 static union node *
10733 union node *n1, *n2, *pipenode;
10734 struct nodelist *lp, *prev;
10738 TRACE(("pipeline: entered\n"));
10739 if (readtoken() == TNOT) {
10741 checkkwd = CHKKWD | CHKALIAS;
10744 n1 = parse_command();
10745 if (readtoken() == TPIPE) {
10746 pipenode = stzalloc(sizeof(struct npipe));
10747 pipenode->type = NPIPE;
10748 /*pipenode->npipe.pipe_backgnd = 0; - stzalloc did it */
10749 lp = stzalloc(sizeof(struct nodelist));
10750 pipenode->npipe.cmdlist = lp;
10754 lp = stzalloc(sizeof(struct nodelist));
10755 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10756 lp->n = parse_command();
10758 } while (readtoken() == TPIPE);
10764 n2 = stzalloc(sizeof(struct nnot));
10772 static union node *
10777 n = stzalloc(sizeof(struct narg));
10779 /*n->narg.next = NULL; - stzalloc did it */
10780 n->narg.text = wordtext;
10781 n->narg.backquote = backquotelist;
10786 fixredir(union node *n, const char *text, int err)
10790 TRACE(("Fix redir %s %d\n", text, err));
10792 n->ndup.vname = NULL;
10794 fd = bb_strtou(text, NULL, 10);
10795 if (!errno && fd >= 0)
10796 n->ndup.dupfd = fd;
10797 else if (LONE_DASH(text))
10798 n->ndup.dupfd = -1;
10801 raise_error_syntax("bad fd number");
10802 n->ndup.vname = makename();
10807 * Returns true if the text contains nothing to expand (no dollar signs
10811 noexpand(const char *text)
10815 while ((c = *text++) != '\0') {
10816 if (c == CTLQUOTEMARK)
10820 else if (SIT(c, BASESYNTAX) == CCTL)
10829 union node *n = redirnode;
10831 if (readtoken() != TWORD)
10832 raise_error_unexpected_syntax(-1);
10833 if (n->type == NHERE) {
10834 struct heredoc *here = heredoc;
10838 if (quoteflag == 0)
10840 TRACE(("Here document %d\n", n->type));
10841 if (!noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN)
10842 raise_error_syntax("illegal eof marker for << redirection");
10843 rmescapes(wordtext, 0);
10844 here->eofmark = wordtext;
10846 if (heredoclist == NULL)
10847 heredoclist = here;
10849 for (p = heredoclist; p->next; p = p->next)
10853 } else if (n->type == NTOFD || n->type == NFROMFD) {
10854 fixredir(n, wordtext, 0);
10856 n->nfile.fname = makename();
10860 static union node *
10863 union node *args, **app;
10864 union node *n = NULL;
10865 union node *vars, **vpp;
10866 union node **rpp, *redir;
10868 #if ENABLE_ASH_BASH_COMPAT
10869 smallint double_brackets_flag = 0;
10870 smallint function_flag = 0;
10880 savecheckkwd = CHKALIAS;
10883 checkkwd = savecheckkwd;
10886 #if ENABLE_ASH_BASH_COMPAT
10888 if (peektoken() != TWORD)
10889 raise_error_unexpected_syntax(TWORD);
10892 case TAND: /* "&&" */
10893 case TOR: /* "||" */
10894 if (!double_brackets_flag) {
10898 wordtext = (char *) (t == TAND ? "-a" : "-o");
10901 n = stzalloc(sizeof(struct narg));
10903 /*n->narg.next = NULL; - stzalloc did it */
10904 n->narg.text = wordtext;
10905 #if ENABLE_ASH_BASH_COMPAT
10906 if (strcmp("[[", wordtext) == 0)
10907 double_brackets_flag = 1;
10908 else if (strcmp("]]", wordtext) == 0)
10909 double_brackets_flag = 0;
10911 n->narg.backquote = backquotelist;
10912 if (savecheckkwd && isassignment(wordtext)) {
10914 vpp = &n->narg.next;
10917 app = &n->narg.next;
10920 #if ENABLE_ASH_BASH_COMPAT
10921 if (function_flag) {
10922 checkkwd = CHKNL | CHKKWD;
10923 switch (peektoken()) {
10935 if (strcmp("[[", wordtext) == 0)
10939 raise_error_unexpected_syntax(-1);
10945 *rpp = n = redirnode;
10946 rpp = &n->nfile.next;
10947 parsefname(); /* read name of redirection file */
10950 IF_ASH_BASH_COMPAT(do_func:)
10951 if (args && app == &args->narg.next
10954 struct builtincmd *bcmd;
10957 /* We have a function */
10958 if (IF_ASH_BASH_COMPAT(!function_flag &&) readtoken() != TRP)
10959 raise_error_unexpected_syntax(TRP);
10960 name = n->narg.text;
10961 if (!goodname(name)
10962 || ((bcmd = find_builtin(name)) && IS_BUILTIN_SPECIAL(bcmd))
10964 raise_error_syntax("bad function name");
10967 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10968 n->narg.next = parse_command();
10971 IF_ASH_BASH_COMPAT(function_flag = 0;)
10982 n = stzalloc(sizeof(struct ncmd));
10984 n->ncmd.args = args;
10985 n->ncmd.assign = vars;
10986 n->ncmd.redirect = redir;
10990 static union node *
10991 parse_command(void)
10993 union node *n1, *n2;
10994 union node *ap, **app;
10995 union node *cp, **cpp;
10996 union node *redir, **rpp;
11003 switch (readtoken()) {
11005 raise_error_unexpected_syntax(-1);
11008 n1 = stzalloc(sizeof(struct nif));
11010 n1->nif.test = list(0);
11011 if (readtoken() != TTHEN)
11012 raise_error_unexpected_syntax(TTHEN);
11013 n1->nif.ifpart = list(0);
11015 while (readtoken() == TELIF) {
11016 n2->nif.elsepart = stzalloc(sizeof(struct nif));
11017 n2 = n2->nif.elsepart;
11019 n2->nif.test = list(0);
11020 if (readtoken() != TTHEN)
11021 raise_error_unexpected_syntax(TTHEN);
11022 n2->nif.ifpart = list(0);
11024 if (lasttoken == TELSE)
11025 n2->nif.elsepart = list(0);
11027 n2->nif.elsepart = NULL;
11035 n1 = stzalloc(sizeof(struct nbinary));
11036 n1->type = (lasttoken == TWHILE) ? NWHILE : NUNTIL;
11037 n1->nbinary.ch1 = list(0);
11040 TRACE(("expecting DO got '%s' %s\n", tokname_array[got] + 1,
11041 got == TWORD ? wordtext : ""));
11042 raise_error_unexpected_syntax(TDO);
11044 n1->nbinary.ch2 = list(0);
11049 if (readtoken() != TWORD || quoteflag || !goodname(wordtext))
11050 raise_error_syntax("bad for loop variable");
11051 n1 = stzalloc(sizeof(struct nfor));
11053 n1->nfor.var = wordtext;
11054 checkkwd = CHKNL | CHKKWD | CHKALIAS;
11055 if (readtoken() == TIN) {
11057 while (readtoken() == TWORD) {
11058 n2 = stzalloc(sizeof(struct narg));
11060 /*n2->narg.next = NULL; - stzalloc did it */
11061 n2->narg.text = wordtext;
11062 n2->narg.backquote = backquotelist;
11064 app = &n2->narg.next;
11067 n1->nfor.args = ap;
11068 if (lasttoken != TNL && lasttoken != TSEMI)
11069 raise_error_unexpected_syntax(-1);
11071 n2 = stzalloc(sizeof(struct narg));
11073 /*n2->narg.next = NULL; - stzalloc did it */
11074 n2->narg.text = (char *)dolatstr;
11075 /*n2->narg.backquote = NULL;*/
11076 n1->nfor.args = n2;
11078 * Newline or semicolon here is optional (but note
11079 * that the original Bourne shell only allowed NL).
11081 if (lasttoken != TSEMI)
11084 checkkwd = CHKNL | CHKKWD | CHKALIAS;
11085 if (readtoken() != TDO)
11086 raise_error_unexpected_syntax(TDO);
11087 n1->nfor.body = list(0);
11091 n1 = stzalloc(sizeof(struct ncase));
11093 if (readtoken() != TWORD)
11094 raise_error_unexpected_syntax(TWORD);
11095 n1->ncase.expr = n2 = stzalloc(sizeof(struct narg));
11097 /*n2->narg.next = NULL; - stzalloc did it */
11098 n2->narg.text = wordtext;
11099 n2->narg.backquote = backquotelist;
11100 checkkwd = CHKNL | CHKKWD | CHKALIAS;
11101 if (readtoken() != TIN)
11102 raise_error_unexpected_syntax(TIN);
11103 cpp = &n1->ncase.cases;
11105 checkkwd = CHKNL | CHKKWD;
11107 while (t != TESAC) {
11108 if (lasttoken == TLP)
11110 *cpp = cp = stzalloc(sizeof(struct nclist));
11112 app = &cp->nclist.pattern;
11114 *app = ap = stzalloc(sizeof(struct narg));
11116 /*ap->narg.next = NULL; - stzalloc did it */
11117 ap->narg.text = wordtext;
11118 ap->narg.backquote = backquotelist;
11119 if (readtoken() != TPIPE)
11121 app = &ap->narg.next;
11124 //ap->narg.next = NULL;
11125 if (lasttoken != TRP)
11126 raise_error_unexpected_syntax(TRP);
11127 cp->nclist.body = list(2);
11129 cpp = &cp->nclist.next;
11131 checkkwd = CHKNL | CHKKWD;
11135 raise_error_unexpected_syntax(TENDCASE);
11142 n1 = stzalloc(sizeof(struct nredir));
11143 n1->type = NSUBSHELL;
11144 n1->nredir.n = list(0);
11145 /*n1->nredir.redirect = NULL; - stzalloc did it */
11152 IF_ASH_BASH_COMPAT(case TFUNCTION:)
11156 return simplecmd();
11159 if (readtoken() != t)
11160 raise_error_unexpected_syntax(t);
11163 /* Now check for redirection which may follow command */
11164 checkkwd = CHKKWD | CHKALIAS;
11166 while (readtoken() == TREDIR) {
11167 *rpp = n2 = redirnode;
11168 rpp = &n2->nfile.next;
11174 if (n1->type != NSUBSHELL) {
11175 n2 = stzalloc(sizeof(struct nredir));
11180 n1->nredir.redirect = redir;
11185 #if ENABLE_ASH_BASH_COMPAT
11186 static int decode_dollar_squote(void)
11188 static const char C_escapes[] ALIGN1 = "nrbtfav""x\\01234567";
11194 p = strchr(C_escapes, c);
11199 if ((unsigned char)(c - '0') <= 7) { /* \ooo */
11203 } while ((unsigned char)(c - '0') <= 7 && --cnt);
11205 } else if (c == 'x') { /* \xHH */
11209 } while (isxdigit(c) && --cnt);
11211 if (cnt == 3) { /* \x but next char is "bad" */
11215 } else { /* simple seq like \\ or \t */
11220 c = bb_process_escape_sequence((void*)&p);
11221 } else { /* unrecognized "\z": print both chars unless ' or " */
11222 if (c != '\'' && c != '"') {
11224 c |= 0x100; /* "please encode \, then me" */
11232 * If eofmark is NULL, read a word or a redirection symbol. If eofmark
11233 * is not NULL, read a here document. In the latter case, eofmark is the
11234 * word which marks the end of the document and striptabs is true if
11235 * leading tabs should be stripped from the document. The argument c
11236 * is the first character of the input token or document.
11238 * Because C does not have internal subroutines, I have simulated them
11239 * using goto's to implement the subroutine linkage. The following macros
11240 * will run code that appears at the end of readtoken1.
11242 #define CHECKEND() {goto checkend; checkend_return:;}
11243 #define PARSEREDIR() {goto parseredir; parseredir_return:;}
11244 #define PARSESUB() {goto parsesub; parsesub_return:;}
11245 #define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;}
11246 #define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;}
11247 #define PARSEARITH() {goto parsearith; parsearith_return:;}
11249 readtoken1(int c, int syntax, char *eofmark, int striptabs)
11251 /* NB: syntax parameter fits into smallint */
11252 /* c parameter is an unsigned char or PEOF or PEOA */
11255 char line[EOFMARKLEN + 1];
11256 struct nodelist *bqlist;
11260 smallint prevsyntax; /* syntax before arithmetic */
11261 #if ENABLE_ASH_EXPAND_PRMT
11262 smallint pssyntax; /* we are expanding a prompt string */
11264 int varnest; /* levels of variables expansion */
11265 int arinest; /* levels of arithmetic expansion */
11266 int parenlevel; /* levels of parens in arithmetic */
11267 int dqvarnest; /* levels of variables expansion within double quotes */
11269 IF_ASH_BASH_COMPAT(smallint bash_dollar_squote = 0;)
11271 startlinno = g_parsefile->linno;
11275 #if ENABLE_ASH_EXPAND_PRMT
11276 pssyntax = (syntax == PSSYNTAX);
11280 dblquote = (syntax == DQSYNTAX);
11286 STARTSTACKSTR(out);
11288 /* For each line, until end of word */
11289 CHECKEND(); /* set c to PEOF if at end of here document */
11290 for (;;) { /* until end of line or end of word */
11291 CHECKSTRSPACE(4, out); /* permit 4 calls to USTPUTC */
11292 switch (SIT(c, syntax)) {
11293 case CNL: /* '\n' */
11294 if (syntax == BASESYNTAX)
11295 goto endword; /* exit outer loop */
11297 g_parsefile->linno++;
11298 setprompt_if(doprompt, 2);
11300 goto loop; /* continue outer loop */
11305 if (eofmark == NULL || dblquote)
11306 USTPUTC(CTLESC, out);
11307 #if ENABLE_ASH_BASH_COMPAT
11308 if (c == '\\' && bash_dollar_squote) {
11309 c = decode_dollar_squote();
11311 USTPUTC('\\', out);
11312 if (eofmark == NULL || dblquote)
11313 /* Or else this SEGVs: $'\<0x82>' */
11314 USTPUTC(CTLESC, out);
11315 c = (unsigned char)c;
11321 case CBACK: /* backslash */
11322 c = pgetc_without_PEOA();
11324 USTPUTC(CTLESC, out);
11325 USTPUTC('\\', out);
11327 } else if (c == '\n') {
11328 setprompt_if(doprompt, 2);
11330 #if ENABLE_ASH_EXPAND_PRMT
11331 if (c == '$' && pssyntax) {
11332 USTPUTC(CTLESC, out);
11333 USTPUTC('\\', out);
11336 /* Backslash is retained if we are in "str" and next char isn't special */
11341 && (c != '"' || eofmark != NULL)
11343 USTPUTC('\\', out);
11345 USTPUTC(CTLESC, out);
11353 if (eofmark == NULL) {
11354 USTPUTC(CTLQUOTEMARK, out);
11362 IF_ASH_BASH_COMPAT(bash_dollar_squote = 0;)
11363 if (eofmark != NULL && varnest == 0) {
11366 if (dqvarnest == 0) {
11367 syntax = BASESYNTAX;
11374 case CVAR: /* '$' */
11375 PARSESUB(); /* parse substitution */
11377 case CENDVAR: /* '}' */
11380 if (dqvarnest > 0) {
11387 #if ENABLE_SH_MATH_SUPPORT
11388 case CLP: /* '(' in arithmetic */
11392 case CRP: /* ')' in arithmetic */
11393 if (parenlevel > 0) {
11396 if (pgetc() == ')') {
11398 if (--arinest == 0) {
11399 syntax = prevsyntax;
11403 * unbalanced parens
11404 * (don't 2nd guess - no error)
11412 case CBQUOTE: /* '`' */
11416 goto endword; /* exit outer loop */
11420 if (varnest == 0) {
11421 #if ENABLE_ASH_BASH_COMPAT
11423 if (pgetc() == '>')
11424 c = 0x100 + '>'; /* flag &> */
11428 goto endword; /* exit outer loop */
11430 IF_ASH_ALIAS(if (c != PEOA))
11437 #if ENABLE_SH_MATH_SUPPORT
11438 if (syntax == ARISYNTAX)
11439 raise_error_syntax("missing '))'");
11441 if (syntax != BASESYNTAX && eofmark == NULL)
11442 raise_error_syntax("unterminated quoted string");
11443 if (varnest != 0) {
11444 startlinno = g_parsefile->linno;
11446 raise_error_syntax("missing '}'");
11448 USTPUTC('\0', out);
11449 len = out - (char *)stackblock();
11450 out = stackblock();
11451 if (eofmark == NULL) {
11452 if ((c == '>' || c == '<' IF_ASH_BASH_COMPAT( || c == 0x100 + '>'))
11455 if (isdigit_str9(out)) {
11456 PARSEREDIR(); /* passed as params: out, c */
11457 lasttoken = TREDIR;
11460 /* else: non-number X seen, interpret it
11461 * as "NNNX>file" = "NNNX >file" */
11465 quoteflag = quotef;
11466 backquotelist = bqlist;
11467 grabstackblock(len);
11471 /* end of readtoken routine */
11474 * Check to see whether we are at the end of the here document. When this
11475 * is called, c is set to the first character of the next input line. If
11476 * we are at the end of the here document, this routine sets the c to PEOF.
11480 #if ENABLE_ASH_ALIAS
11482 c = pgetc_without_PEOA();
11485 while (c == '\t') {
11486 c = pgetc_without_PEOA();
11489 if (c == *eofmark) {
11490 if (pfgets(line, sizeof(line)) != NULL) {
11494 for (q = eofmark + 1; *q && *p == *q; p++, q++)
11496 if (*p == '\n' && *q == '\0') {
11498 g_parsefile->linno++;
11499 needprompt = doprompt;
11501 pushstring(line, NULL);
11506 goto checkend_return;
11510 * Parse a redirection operator. The variable "out" points to a string
11511 * specifying the fd to be redirected. The variable "c" contains the
11512 * first character of the redirection operator.
11515 /* out is already checked to be a valid number or "" */
11516 int fd = (*out == '\0' ? -1 : atoi(out));
11519 np = stzalloc(sizeof(struct nfile));
11524 np->type = NAPPEND;
11526 np->type = NCLOBBER;
11529 /* it also can be NTO2 (>&file), but we can't figure it out yet */
11535 #if ENABLE_ASH_BASH_COMPAT
11536 else if (c == 0x100 + '>') { /* this flags &> redirection */
11538 pgetc(); /* this is '>', no need to check */
11542 else { /* c == '<' */
11543 /*np->nfile.fd = 0; - stzalloc did it */
11547 if (sizeof(struct nfile) != sizeof(struct nhere)) {
11548 np = stzalloc(sizeof(struct nhere));
11549 /*np->nfile.fd = 0; - stzalloc did it */
11552 heredoc = stzalloc(sizeof(struct heredoc));
11553 heredoc->here = np;
11556 heredoc->striptabs = 1;
11558 /*heredoc->striptabs = 0; - stzalloc did it */
11564 np->type = NFROMFD;
11568 np->type = NFROMTO;
11580 goto parseredir_return;
11584 * Parse a substitution. At this point, we have read the dollar sign
11585 * and nothing else.
11588 /* is_special(c) evaluates to 1 for c in "!#$*-0123456789?@"; 0 otherwise
11589 * (assuming ascii char codes, as the original implementation did) */
11590 #define is_special(c) \
11591 (((unsigned)(c) - 33 < 32) \
11592 && ((0xc1ff920dU >> ((unsigned)(c) - 33)) & 1))
11594 unsigned char subtype;
11599 if (c > 255 /* PEOA or PEOF */
11600 || (c != '(' && c != '{' && !is_name(c) && !is_special(c))
11602 #if ENABLE_ASH_BASH_COMPAT
11603 if (syntax != DQSYNTAX && c == '\'')
11604 bash_dollar_squote = 1;
11609 } else if (c == '(') {
11610 /* $(command) or $((arith)) */
11611 if (pgetc() == '(') {
11612 #if ENABLE_SH_MATH_SUPPORT
11615 raise_error_syntax("you disabled math support for $((arith)) syntax");
11622 /* $VAR, $<specialchar>, ${...}, or PEOA/PEOF */
11623 USTPUTC(CTLVAR, out);
11624 typeloc = out - (char *)stackblock();
11625 USTPUTC(VSNORMAL, out);
11626 subtype = VSNORMAL;
11632 c = '#'; /* ${#} - same as $# */
11634 subtype = VSLENGTH; /* ${#VAR} */
11639 if (c <= 255 /* not PEOA or PEOF */ && is_name(c)) {
11640 /* $[{[#]]NAME[}] */
11644 } while (c <= 255 /* not PEOA or PEOF */ && is_in_name(c));
11645 } else if (isdigit(c)) {
11646 /* $[{[#]]NUM[}] */
11650 } while (isdigit(c));
11651 } else if (is_special(c)) {
11652 /* $[{[#]]<specialchar>[}] */
11657 raise_error_syntax("bad substitution");
11659 if (c != '}' && subtype == VSLENGTH) {
11660 /* ${#VAR didn't end with } */
11666 if (subtype == 0) {
11667 static const char types[] ALIGN1 = "}-+?=";
11668 /* ${VAR...} but not $VAR or ${#VAR} */
11669 /* c == first char after VAR */
11673 #if ENABLE_ASH_BASH_COMPAT
11674 /* This check is only needed to not misinterpret
11675 * ${VAR:-WORD}, ${VAR:+WORD}, ${VAR:=WORD}, ${VAR:?WORD}
11678 if (!strchr(types, c)) {
11679 subtype = VSSUBSTR;
11681 break; /* "goto do_pungetc" is bigger (!) */
11687 const char *p = strchr(types, c);
11690 subtype = p - types + VSNORMAL;
11696 subtype = (c == '#' ? VSTRIMLEFT : VSTRIMRIGHT);
11703 #if ENABLE_ASH_BASH_COMPAT
11705 /* ${v/[/]pattern/repl} */
11706 //TODO: encode pattern and repl separately.
11707 // Currently ${v/$var_with_slash/repl} is horribly broken
11708 subtype = VSREPLACE;
11712 subtype++; /* VSREPLACEALL */
11720 ((unsigned char *)stackblock())[typeloc] = subtype | flags;
11721 if (subtype != VSNORMAL) {
11728 goto parsesub_return;
11732 * Called to parse command substitutions. Newstyle is set if the command
11733 * is enclosed inside $(...); nlpp is a pointer to the head of the linked
11734 * list of commands (passed by reference), and savelen is the number of
11735 * characters on the top of the stack which must be preserved.
11738 struct nodelist **nlpp;
11742 smallint saveprompt = 0;
11745 savelen = out - (char *)stackblock();
11748 * FIXME: this can allocate very large block on stack and SEGV.
11750 * echo "..<100kbytes>..`true` $(true) `true` ..."
11751 * allocates 100kb for every command subst. With about
11752 * a hundred command substitutions stack overflows.
11753 * With larger prepended string, SEGV happens sooner.
11755 str = alloca(savelen);
11756 memcpy(str, stackblock(), savelen);
11760 /* We must read until the closing backquote, giving special
11761 * treatment to some slashes, and then push the string and
11762 * reread it as input, interpreting it normally.
11768 STARTSTACKSTR(pout);
11772 setprompt_if(needprompt, 2);
11781 g_parsefile->linno++;
11782 setprompt_if(doprompt, 2);
11784 * If eating a newline, avoid putting
11785 * the newline into the new character
11786 * stream (via the STPUTC after the
11791 if (pc != '\\' && pc != '`' && pc != '$'
11792 && (!dblquote || pc != '"')
11794 STPUTC('\\', pout);
11796 if (pc <= 255 /* not PEOA or PEOF */) {
11802 IF_ASH_ALIAS(case PEOA:)
11803 startlinno = g_parsefile->linno;
11804 raise_error_syntax("EOF in backquote substitution");
11807 g_parsefile->linno++;
11808 needprompt = doprompt;
11817 STPUTC('\0', pout);
11818 psavelen = pout - (char *)stackblock();
11819 if (psavelen > 0) {
11820 pstr = grabstackstr(pout);
11821 setinputstring(pstr);
11826 nlpp = &(*nlpp)->next;
11827 *nlpp = stzalloc(sizeof(**nlpp));
11828 /* (*nlpp)->next = NULL; - stzalloc did it */
11831 saveprompt = doprompt;
11838 doprompt = saveprompt;
11839 else if (readtoken() != TRP)
11840 raise_error_unexpected_syntax(TRP);
11845 * Start reading from old file again, ignoring any pushed back
11846 * tokens left from the backquote parsing
11851 while (stackblocksize() <= savelen)
11853 STARTSTACKSTR(out);
11855 memcpy(out, str, savelen);
11856 STADJUST(savelen, out);
11858 USTPUTC(CTLBACKQ, out);
11860 goto parsebackq_oldreturn;
11861 goto parsebackq_newreturn;
11864 #if ENABLE_SH_MATH_SUPPORT
11866 * Parse an arithmetic expansion (indicate start of one and set state)
11869 if (++arinest == 1) {
11870 prevsyntax = syntax;
11871 syntax = ARISYNTAX;
11873 USTPUTC(CTLARI, out);
11874 goto parsearith_return;
11877 } /* end of readtoken */
11880 * Read the next input token.
11881 * If the token is a word, we set backquotelist to the list of cmds in
11882 * backquotes. We set quoteflag to true if any part of the word was
11884 * If the token is TREDIR, then we set redirnode to a structure containing
11886 * In all cases, the variable startlinno is set to the number of the line
11887 * on which the token starts.
11889 * [Change comment: here documents and internal procedures]
11890 * [Readtoken shouldn't have any arguments. Perhaps we should make the
11891 * word parsing code into a separate routine. In this case, readtoken
11892 * doesn't need to have any internal procedures, but parseword does.
11893 * We could also make parseoperator in essence the main routine, and
11894 * have parseword (readtoken1?) handle both words and redirection.]
11896 #define NEW_xxreadtoken
11897 #ifdef NEW_xxreadtoken
11898 /* singles must be first! */
11899 static const char xxreadtoken_chars[7] ALIGN1 = {
11900 '\n', '(', ')', /* singles */
11901 '&', '|', ';', /* doubles */
11905 #define xxreadtoken_singles 3
11906 #define xxreadtoken_doubles 3
11908 static const char xxreadtoken_tokens[] ALIGN1 = {
11909 TNL, TLP, TRP, /* only single occurrence allowed */
11910 TBACKGND, TPIPE, TSEMI, /* if single occurrence */
11911 TEOF, /* corresponds to trailing nul */
11912 TAND, TOR, TENDCASE /* if double occurrence */
11924 setprompt_if(needprompt, 2);
11925 startlinno = g_parsefile->linno;
11926 for (;;) { /* until token or start of word found */
11928 if (c == ' ' || c == '\t' IF_ASH_ALIAS( || c == PEOA))
11932 while ((c = pgetc()) != '\n' && c != PEOF)
11935 } else if (c == '\\') {
11936 if (pgetc() != '\n') {
11938 break; /* return readtoken1(...) */
11940 startlinno = ++g_parsefile->linno;
11941 setprompt_if(doprompt, 2);
11945 p = xxreadtoken_chars + sizeof(xxreadtoken_chars) - 1;
11948 g_parsefile->linno++;
11949 needprompt = doprompt;
11952 p = strchr(xxreadtoken_chars, c);
11954 break; /* return readtoken1(...) */
11956 if ((int)(p - xxreadtoken_chars) >= xxreadtoken_singles) {
11958 if (cc == c) { /* double occurrence? */
11959 p += xxreadtoken_doubles + 1;
11962 #if ENABLE_ASH_BASH_COMPAT
11963 if (c == '&' && cc == '>') /* &> */
11964 break; /* return readtoken1(...) */
11969 lasttoken = xxreadtoken_tokens[p - xxreadtoken_chars];
11974 return readtoken1(c, BASESYNTAX, (char *) NULL, 0);
11976 #else /* old xxreadtoken */
11977 #define RETURN(token) return lasttoken = token
11987 setprompt_if(needprompt, 2);
11988 startlinno = g_parsefile->linno;
11989 for (;;) { /* until token or start of word found */
11992 case ' ': case '\t':
11993 IF_ASH_ALIAS(case PEOA:)
11996 while ((c = pgetc()) != '\n' && c != PEOF)
12001 if (pgetc() == '\n') {
12002 startlinno = ++g_parsefile->linno;
12003 setprompt_if(doprompt, 2);
12009 g_parsefile->linno++;
12010 needprompt = doprompt;
12015 if (pgetc() == '&')
12020 if (pgetc() == '|')
12025 if (pgetc() == ';')
12038 return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
12041 #endif /* old xxreadtoken */
12047 int kwd = checkkwd;
12049 smallint alreadyseen = tokpushback;
12052 #if ENABLE_ASH_ALIAS
12068 if (t != TWORD || quoteflag) {
12073 * check for keywords
12075 if (kwd & CHKKWD) {
12076 const char *const *pp;
12078 pp = findkwd(wordtext);
12080 lasttoken = t = pp - tokname_array;
12081 TRACE(("keyword '%s' recognized\n", tokname_array[t] + 1));
12086 if (checkkwd & CHKALIAS) {
12087 #if ENABLE_ASH_ALIAS
12089 ap = lookupalias(wordtext, 1);
12092 pushstring(ap->val, ap);
12102 TRACE(("token '%s' %s\n", tokname_array[t] + 1, t == TWORD ? wordtext : ""));
12104 TRACE(("reread token '%s' %s\n", tokname_array[t] + 1, t == TWORD ? wordtext : ""));
12120 * Read and parse a command. Returns NODE_EOF on end of file.
12121 * (NULL is a valid parse tree indicating a blank line.)
12123 static union node *
12124 parsecmd(int interact)
12129 doprompt = interact;
12130 setprompt_if(doprompt, doprompt);
12136 * Input any here documents.
12141 struct heredoc *here;
12144 here = heredoclist;
12145 heredoclist = NULL;
12148 setprompt_if(needprompt, 2);
12149 readtoken1(pgetc(), here->here->type == NHERE ? SQSYNTAX : DQSYNTAX,
12150 here->eofmark, here->striptabs);
12151 n = stzalloc(sizeof(struct narg));
12152 n->narg.type = NARG;
12153 /*n->narg.next = NULL; - stzalloc did it */
12154 n->narg.text = wordtext;
12155 n->narg.backquote = backquotelist;
12156 here->here->nhere.doc = n;
12163 * called by editline -- any expansions to the prompt should be added here.
12165 #if ENABLE_ASH_EXPAND_PRMT
12166 static const char *
12167 expandstr(const char *ps)
12171 /* XXX Fix (char *) cast. It _is_ a bug. ps is variable's value,
12172 * and token processing _can_ alter it (delete NULs etc). */
12173 setinputstring((char *)ps);
12174 readtoken1(pgetc(), PSSYNTAX, nullstr, 0);
12177 n.narg.type = NARG;
12178 n.narg.next = NULL;
12179 n.narg.text = wordtext;
12180 n.narg.backquote = backquotelist;
12182 expandarg(&n, NULL, EXP_QUOTED);
12183 return stackblock();
12188 * Execute a command or commands contained in a string.
12191 evalstring(char *s, int mask)
12194 struct stackmark smark;
12198 setstackmark(&smark);
12201 while ((n = parsecmd(0)) != NODE_EOF) {
12203 popstackmark(&smark);
12216 * The eval command.
12218 static int FAST_FUNC
12219 evalcmd(int argc UNUSED_PARAM, char **argv)
12228 STARTSTACKSTR(concat);
12230 concat = stack_putstr(p, concat);
12234 STPUTC(' ', concat);
12236 STPUTC('\0', concat);
12237 p = grabstackstr(concat);
12239 evalstring(p, ~SKIPEVAL);
12245 * Read and execute commands.
12246 * "Top" is nonzero for the top level command loop;
12247 * it turns on prompting if the shell is interactive.
12253 struct stackmark smark;
12257 TRACE(("cmdloop(%d) called\n", top));
12261 setstackmark(&smark);
12264 showjobs(SHOW_CHANGED|SHOW_STDERR);
12267 if (iflag && top) {
12271 n = parsecmd(inter);
12273 if (DEBUG > 2 && debug && (n != NODE_EOF))
12276 if (n == NODE_EOF) {
12277 if (!top || numeof >= 50)
12279 if (!stoppedjobs()) {
12282 out2str("\nUse \"exit\" to leave shell.\n");
12285 } else if (nflag == 0) {
12286 /* job_warning can only be 2,1,0. Here 2->1, 1/0->0 */
12291 popstackmark(&smark);
12296 return skip & SKIPEVAL;
12303 * Take commands from a file. To be compatible we should do a path
12304 * search for the file, which is necessary to find sub-commands.
12307 find_dot_file(char *name)
12310 const char *path = pathval();
12313 /* don't try this for absolute or relative paths */
12314 if (strchr(name, '/'))
12317 /* IIRC standards do not say whether . is to be searched.
12318 * And it is even smaller this way, making it unconditional for now:
12320 if (1) { /* ENABLE_ASH_BASH_COMPAT */
12325 while ((fullname = path_advance(&path, name)) != NULL) {
12327 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
12329 * Don't bother freeing here, since it will
12330 * be freed by the caller.
12334 if (fullname != name)
12335 stunalloc(fullname);
12338 /* not found in the PATH */
12339 ash_msg_and_raise_error("%s: not found", name);
12343 static int FAST_FUNC
12344 dotcmd(int argc, char **argv)
12347 struct strlist *sp;
12348 volatile struct shparam saveparam;
12350 for (sp = cmdenviron; sp; sp = sp->next)
12351 setvareq(ckstrdup(sp->text), VSTRFIXED | VTEXTFIXED);
12354 /* bash says: "bash: .: filename argument required" */
12355 return 2; /* bash compat */
12358 /* "false; . empty_file; echo $?" should print 0, not 1: */
12361 /* This aborts if file isn't found, which is POSIXly correct.
12362 * bash returns exitcode 1 instead.
12364 fullname = find_dot_file(argv[1]);
12367 if (argc) { /* argc > 0, argv[0] != NULL */
12368 saveparam = shellparam;
12369 shellparam.malloced = 0;
12370 shellparam.nparam = argc;
12371 shellparam.p = argv;
12374 /* This aborts if file can't be opened, which is POSIXly correct.
12375 * bash returns exitcode 1 instead.
12377 setinputfile(fullname, INPUT_PUSH_FILE);
12378 commandname = fullname;
12383 freeparam(&shellparam);
12384 shellparam = saveparam;
12390 static int FAST_FUNC
12391 exitcmd(int argc UNUSED_PARAM, char **argv)
12396 exitstatus = number(argv[1]);
12397 raise_exception(EXEXIT);
12402 * Read a file containing shell functions.
12405 readcmdfile(char *name)
12407 setinputfile(name, INPUT_PUSH_FILE);
12413 /* ============ find_command inplementation */
12416 * Resolve a command name. If you change this routine, you may have to
12417 * change the shellexec routine as well.
12420 find_command(char *name, struct cmdentry *entry, int act, const char *path)
12422 struct tblentry *cmdp;
12429 struct builtincmd *bcmd;
12431 /* If name contains a slash, don't use PATH or hash table */
12432 if (strchr(name, '/') != NULL) {
12433 entry->u.index = -1;
12434 if (act & DO_ABS) {
12435 while (stat(name, &statb) < 0) {
12437 if (errno == EINTR)
12440 entry->cmdtype = CMDUNKNOWN;
12444 entry->cmdtype = CMDNORMAL;
12448 /* #if ENABLE_FEATURE_SH_STANDALONE... moved after builtin check */
12450 updatetbl = (path == pathval());
12453 if (strstr(path, "%builtin") != NULL)
12454 act |= DO_ALTBLTIN;
12457 /* If name is in the table, check answer will be ok */
12458 cmdp = cmdlookup(name, 0);
12459 if (cmdp != NULL) {
12462 switch (cmdp->cmdtype) {
12480 } else if (cmdp->rehash == 0)
12481 /* if not invalidated by cd, we're done */
12485 /* If %builtin not in path, check for builtin next */
12486 bcmd = find_builtin(name);
12488 if (IS_BUILTIN_REGULAR(bcmd))
12489 goto builtin_success;
12490 if (act & DO_ALTPATH) {
12491 if (!(act & DO_ALTBLTIN))
12492 goto builtin_success;
12493 } else if (builtinloc <= 0) {
12494 goto builtin_success;
12498 #if ENABLE_FEATURE_SH_STANDALONE
12500 int applet_no = find_applet_by_name(name);
12501 if (applet_no >= 0) {
12502 entry->cmdtype = CMDNORMAL;
12503 entry->u.index = -2 - applet_no;
12509 /* We have to search path. */
12510 prev = -1; /* where to start */
12511 if (cmdp && cmdp->rehash) { /* doing a rehash */
12512 if (cmdp->cmdtype == CMDBUILTIN)
12515 prev = cmdp->param.index;
12521 while ((fullname = path_advance(&path, name)) != NULL) {
12522 stunalloc(fullname);
12523 /* NB: code below will still use fullname
12524 * despite it being "unallocated" */
12527 if (prefix(pathopt, "builtin")) {
12529 goto builtin_success;
12532 if ((act & DO_NOFUNC)
12533 || !prefix(pathopt, "func")
12534 ) { /* ignore unimplemented options */
12538 /* if rehash, don't redo absolute path names */
12539 if (fullname[0] == '/' && idx <= prev) {
12542 TRACE(("searchexec \"%s\": no change\n", name));
12545 while (stat(fullname, &statb) < 0) {
12547 if (errno == EINTR)
12550 if (errno != ENOENT && errno != ENOTDIR)
12554 e = EACCES; /* if we fail, this will be the error */
12555 if (!S_ISREG(statb.st_mode))
12557 if (pathopt) { /* this is a %func directory */
12558 stalloc(strlen(fullname) + 1);
12559 /* NB: stalloc will return space pointed by fullname
12560 * (because we don't have any intervening allocations
12561 * between stunalloc above and this stalloc) */
12562 readcmdfile(fullname);
12563 cmdp = cmdlookup(name, 0);
12564 if (cmdp == NULL || cmdp->cmdtype != CMDFUNCTION)
12565 ash_msg_and_raise_error("%s not defined in %s", name, fullname);
12566 stunalloc(fullname);
12569 TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
12571 entry->cmdtype = CMDNORMAL;
12572 entry->u.index = idx;
12576 cmdp = cmdlookup(name, 1);
12577 cmdp->cmdtype = CMDNORMAL;
12578 cmdp->param.index = idx;
12583 /* We failed. If there was an entry for this command, delete it */
12584 if (cmdp && updatetbl)
12585 delete_cmd_entry();
12587 ash_msg("%s: %s", name, errmsg(e, "not found"));
12588 entry->cmdtype = CMDUNKNOWN;
12593 entry->cmdtype = CMDBUILTIN;
12594 entry->u.cmd = bcmd;
12598 cmdp = cmdlookup(name, 1);
12599 cmdp->cmdtype = CMDBUILTIN;
12600 cmdp->param.cmd = bcmd;
12604 entry->cmdtype = cmdp->cmdtype;
12605 entry->u = cmdp->param;
12609 /* ============ trap.c */
12612 * The trap builtin.
12614 static int FAST_FUNC
12615 trapcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12619 int signo, exitcode;
12624 for (signo = 0; signo < NSIG; signo++) {
12625 char *tr = trap_ptr[signo];
12627 /* note: bash adds "SIG", but only if invoked
12628 * as "bash". If called as "sh", or if set -o posix,
12629 * then it prints short signal names.
12630 * We are printing short names: */
12631 out1fmt("trap -- %s %s\n",
12633 get_signame(signo));
12634 /* trap_ptr != trap only if we are in special-cased `trap` code.
12635 * In this case, we will exit very soon, no need to free(). */
12636 /* if (trap_ptr != trap && tp[0]) */
12641 if (trap_ptr != trap) {
12654 signo = get_signum(*ap);
12656 /* Mimic bash message exactly */
12657 ash_msg("%s: invalid signal specification", *ap);
12663 if (LONE_DASH(action))
12666 action = ckstrdup(action);
12670 may_have_traps = 1;
12671 trap[signo] = action;
12682 /* ============ Builtins */
12684 #if ENABLE_ASH_HELP
12685 static int FAST_FUNC
12686 helpcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12692 "Built-in commands:\n"
12693 "------------------\n");
12694 for (col = 0, i = 0; i < ARRAY_SIZE(builtintab); i++) {
12695 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '),
12696 builtintab[i].name + 1);
12702 # if ENABLE_FEATURE_SH_STANDALONE
12704 const char *a = applet_names;
12706 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '), a);
12711 while (*a++ != '\0')
12717 return EXIT_SUCCESS;
12722 static int FAST_FUNC
12723 historycmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12725 show_history(line_input_state);
12726 return EXIT_SUCCESS;
12731 * The export and readonly commands.
12733 static int FAST_FUNC
12734 exportcmd(int argc UNUSED_PARAM, char **argv)
12744 /* "readonly" in bash accepts, but ignores -n.
12745 * We do the same: it saves a conditional in nextopt's param.
12748 while ((opt = nextopt("np")) != '\0') {
12750 flag_off = VEXPORT;
12753 if (argv[0][0] == 'r') {
12755 flag_off = 0; /* readonly ignores -n */
12757 flag_off = ~flag_off;
12759 /*if (opt_p_not_specified) - bash doesnt check this. Try "export -p NAME" */
12765 p = strchr(name, '=');
12769 vp = *findvar(hashvar(name), name);
12771 vp->flags = ((vp->flags | flag) & flag_off);
12775 setvar(name, p, (flag & flag_off));
12776 } while ((name = *++aptr) != NULL);
12781 /* No arguments. Show the list of exported or readonly vars.
12784 showvars(argv[0], flag, 0);
12789 * Delete a function if it exists.
12792 unsetfunc(const char *name)
12794 struct tblentry *cmdp;
12796 cmdp = cmdlookup(name, 0);
12797 if (cmdp != NULL && cmdp->cmdtype == CMDFUNCTION)
12798 delete_cmd_entry();
12802 * The unset builtin command. We unset the function before we unset the
12803 * variable to allow a function to be unset when there is a readonly variable
12804 * with the same name.
12806 static int FAST_FUNC
12807 unsetcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12814 while ((i = nextopt("vf")) != 0) {
12818 for (ap = argptr; *ap; ap++) {
12831 static const unsigned char timescmd_str[] ALIGN1 = {
12832 ' ', offsetof(struct tms, tms_utime),
12833 '\n', offsetof(struct tms, tms_stime),
12834 ' ', offsetof(struct tms, tms_cutime),
12835 '\n', offsetof(struct tms, tms_cstime),
12838 static int FAST_FUNC
12839 timescmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12841 unsigned long clk_tck, s, t;
12842 const unsigned char *p;
12845 clk_tck = bb_clk_tck();
12850 t = *(clock_t *)(((char *) &buf) + p[1]);
12853 out1fmt("%lum%lu.%03lus%c",
12855 (t * 1000) / clk_tck,
12863 #if ENABLE_SH_MATH_SUPPORT
12865 * The let builtin. Partially stolen from GNU Bash, the Bourne Again SHell.
12866 * Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
12868 * Copyright (C) 2003 Vladimir Oleynik <dzo@simtreas.ru>
12870 static int FAST_FUNC
12871 letcmd(int argc UNUSED_PARAM, char **argv)
12877 ash_msg_and_raise_error("expression expected");
12879 i = ash_arith(*argv);
12887 * The read builtin. Options:
12888 * -r Do not interpret '\' specially
12889 * -s Turn off echo (tty only)
12890 * -n NCHARS Read NCHARS max
12891 * -p PROMPT Display PROMPT on stderr (if input is from tty)
12892 * -t SECONDS Timeout after SECONDS (tty or pipe only)
12893 * -u FD Read from given FD instead of fd 0
12894 * This uses unbuffered input, which may be avoidable in some cases.
12895 * TODO: bash also has:
12896 * -a ARRAY Read into array[0],[1],etc
12897 * -d DELIM End on DELIM char, not newline
12898 * -e Use line editing (tty only)
12900 static int FAST_FUNC
12901 readcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12903 char *opt_n = NULL;
12904 char *opt_p = NULL;
12905 char *opt_t = NULL;
12906 char *opt_u = NULL;
12907 int read_flags = 0;
12911 while ((i = nextopt("p:u:rt:n:s")) != '\0') {
12920 read_flags |= BUILTIN_READ_SILENT;
12926 read_flags |= BUILTIN_READ_RAW;
12936 /* "read -s" needs to save/restore termios, can't allow ^C
12937 * to jump out of it.
12940 r = shell_builtin_read(setvar0,
12942 bltinlookup("IFS"), /* can be NULL */
12951 if ((uintptr_t)r > 1)
12952 ash_msg_and_raise_error(r);
12954 return (uintptr_t)r;
12957 static int FAST_FUNC
12958 umaskcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12960 static const char permuser[3] ALIGN1 = "ogu";
12963 int symbolic_mode = 0;
12965 while (nextopt("S") != '\0') {
12974 if (*argptr == NULL) {
12975 if (symbolic_mode) {
12976 char buf[sizeof(",u=rwx,g=rwx,o=rwx")];
12983 *p++ = permuser[i];
12985 /* mask is 0..0uuugggooo. i=2 selects uuu bits */
12986 if (!(mask & 0400)) *p++ = 'r';
12987 if (!(mask & 0200)) *p++ = 'w';
12988 if (!(mask & 0100)) *p++ = 'x';
12996 out1fmt("%04o\n", mask);
12999 char *modestr = *argptr;
13000 /* numeric umasks are taken as-is */
13001 /* symbolic umasks are inverted: "umask a=rx" calls umask(222) */
13002 if (!isdigit(modestr[0]))
13004 mask = bb_parse_mode(modestr, mask);
13005 if ((unsigned)mask > 0777) {
13006 ash_msg_and_raise_error("illegal mode: %s", modestr);
13008 if (!isdigit(modestr[0]))
13015 static int FAST_FUNC
13016 ulimitcmd(int argc UNUSED_PARAM, char **argv)
13018 return shell_builtin_ulimit(argv);
13021 /* ============ main() and helpers */
13024 * Called to exit the shell.
13033 #if ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
13034 save_history(line_input_state);
13037 status = exitstatus;
13038 TRACE(("pid %d, exitshell(%d)\n", getpid(), status));
13039 if (setjmp(loc.loc)) {
13040 if (exception_type == EXEXIT)
13041 /* dash bug: it just does _exit(exitstatus) here
13042 * but we have to do setjobctl(0) first!
13043 * (bug is still not fixed in dash-0.5.3 - if you run dash
13044 * under Midnight Commander, on exit from dash MC is backgrounded) */
13045 status = exitstatus;
13048 exception_handler = &loc;
13055 flush_stdout_stderr();
13065 /* from input.c: */
13066 /* we will never free this */
13067 basepf.next_to_pgetc = basepf.buf = ckmalloc(IBUFSIZ);
13070 signal(SIGCHLD, SIG_DFL);
13071 /* bash re-enables SIGHUP which is SIG_IGNed on entry.
13072 * Try: "trap '' HUP; bash; echo RET" and type "kill -HUP $$"
13074 signal(SIGHUP, SIG_DFL);
13080 struct stat st1, st2;
13083 for (envp = environ; envp && *envp; envp++) {
13084 if (strchr(*envp, '=')) {
13085 setvareq(*envp, VEXPORT|VTEXTFIXED);
13089 setvar0("PPID", utoa(getppid()));
13090 #if ENABLE_ASH_BASH_COMPAT
13091 p = lookupvar("SHLVL");
13092 setvar("SHLVL", utoa((p ? atoi(p) : 0) + 1), VEXPORT);
13093 if (!lookupvar("HOSTNAME")) {
13094 struct utsname uts;
13096 setvar0("HOSTNAME", uts.nodename);
13099 p = lookupvar("PWD");
13101 if (p[0] != '/' || stat(p, &st1) || stat(".", &st2)
13102 || st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino
13112 //usage:#define ash_trivial_usage
13113 //usage: "[-/+OPTIONS] [-/+o OPT]... [-c 'SCRIPT' [ARG0 [ARGS]] / FILE [ARGS]]"
13114 //usage:#define ash_full_usage "\n\n"
13115 //usage: "Unix shell interpreter"
13117 //usage:#if ENABLE_FEATURE_SH_IS_ASH
13118 //usage:# define sh_trivial_usage ash_trivial_usage
13119 //usage:# define sh_full_usage ash_full_usage
13121 //usage:#if ENABLE_FEATURE_BASH_IS_ASH
13122 //usage:# define bash_trivial_usage ash_trivial_usage
13123 //usage:# define bash_full_usage ash_full_usage
13127 * Process the shell command line arguments.
13130 procargs(char **argv)
13133 const char *xminusc;
13138 /* if (xargv[0]) - mmm, this is always true! */
13140 for (i = 0; i < NOPTS; i++)
13143 if (options(/*cmdline:*/ 1)) {
13144 /* it already printed err message */
13145 raise_exception(EXERROR);
13149 if (*xargv == NULL) {
13151 ash_msg_and_raise_error(bb_msg_requires_arg, "-c");
13154 if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
13158 for (i = 0; i < NOPTS; i++)
13159 if (optlist[i] == 2)
13164 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
13169 } else if (!sflag) {
13170 setinputfile(*xargv, 0);
13173 commandname = arg0;
13176 shellparam.p = xargv;
13177 #if ENABLE_ASH_GETOPTS
13178 shellparam.optind = 1;
13179 shellparam.optoff = -1;
13181 /* assert(shellparam.malloced == 0 && shellparam.nparam == 0); */
13183 shellparam.nparam++;
13190 * Read /etc/profile or .profile.
13193 read_profile(const char *name)
13197 if (setinputfile(name, INPUT_PUSH_FILE | INPUT_NOFILE_OK) < 0)
13206 * This routine is called when an error or an interrupt occurs in an
13207 * interactive shell and control is returned to the main command loop.
13215 /* from input.c: */
13216 g_parsefile->left_in_buffer = 0;
13217 g_parsefile->left_in_line = 0; /* clear input buffer */
13219 /* from parser.c: */
13222 /* from redir.c: */
13223 clearredir(/*drop:*/ 0);
13227 static short profile_buf[16384];
13228 extern int etext();
13232 * Main routine. We initialize things, parse the arguments, execute
13233 * profiles if we're a login shell, and then call cmdloop to execute
13234 * commands. The setjmp call sets up the location to jump to when an
13235 * exception occurs. When an exception occurs the variable "state"
13236 * is used to figure out how far we had gotten.
13238 int ash_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
13239 int ash_main(int argc UNUSED_PARAM, char **argv)
13241 const char *shinit;
13242 volatile smallint state;
13243 struct jmploc jmploc;
13244 struct stackmark smark;
13246 /* Initialize global data */
13250 #if ENABLE_ASH_ALIAS
13256 monitor(4, etext, profile_buf, sizeof(profile_buf), 50);
13259 #if ENABLE_FEATURE_EDITING
13260 line_input_state = new_line_input_t(FOR_SHELL | WITH_PATH_LOOKUP);
13263 if (setjmp(jmploc.loc)) {
13269 e = exception_type;
13273 if (e == EXEXIT || s == 0 || iflag == 0 || shlvl) {
13277 newline_and_flush(stderr);
13280 popstackmark(&smark);
13281 FORCE_INT_ON; /* enable interrupts */
13290 exception_handler = &jmploc;
13293 TRACE(("Shell args: "));
13294 trace_puts_args(argv);
13296 rootpid = getpid();
13299 setstackmark(&smark);
13302 if (argv[0] && argv[0][0] == '-')
13308 read_profile("/etc/profile");
13311 hp = lookupvar("HOME");
13313 hp = concat_path_file(hp, ".profile");
13322 getuid() == geteuid() && getgid() == getegid() &&
13326 shinit = lookupvar("ENV");
13327 if (shinit != NULL && *shinit != '\0') {
13328 read_profile(shinit);
13334 /* evalstring pushes parsefile stack.
13335 * Ensure we don't falsely claim that 0 (stdin)
13336 * is one of stacked source fds.
13337 * Testcase: ash -c 'exec 1>&0' must not complain. */
13338 // if (!sflag) g_parsefile->pf_fd = -1;
13339 // ^^ not necessary since now we special-case fd 0
13340 // in is_hidden_fd() to not be considered "hidden fd"
13341 evalstring(minusc, 0);
13344 if (sflag || minusc == NULL) {
13345 #if MAX_HISTORY > 0 && ENABLE_FEATURE_EDITING_SAVEHISTORY
13347 const char *hp = lookupvar("HISTFILE");
13349 hp = lookupvar("HOME");
13351 hp = concat_path_file(hp, ".ash_history");
13352 setvar0("HISTFILE", hp);
13354 hp = lookupvar("HISTFILE");
13358 line_input_state->hist_file = hp;
13359 # if ENABLE_FEATURE_SH_HISTFILESIZE
13360 hp = lookupvar("HISTFILESIZE");
13361 line_input_state->max_history = size_from_HISTFILESIZE(hp);
13365 state4: /* XXX ??? - why isn't this before the "if" statement */
13373 extern void _mcleanup(void);
13377 TRACE(("End of main reached\n"));
13384 * Copyright (c) 1989, 1991, 1993, 1994
13385 * The Regents of the University of California. All rights reserved.
13387 * This code is derived from software contributed to Berkeley by
13388 * Kenneth Almquist.
13390 * Redistribution and use in source and binary forms, with or without
13391 * modification, are permitted provided that the following conditions
13393 * 1. Redistributions of source code must retain the above copyright
13394 * notice, this list of conditions and the following disclaimer.
13395 * 2. Redistributions in binary form must reproduce the above copyright
13396 * notice, this list of conditions and the following disclaimer in the
13397 * documentation and/or other materials provided with the distribution.
13398 * 3. Neither the name of the University nor the names of its contributors
13399 * may be used to endorse or promote products derived from this software
13400 * without specific prior written permission.
13402 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
13403 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
13404 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
13405 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
13406 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
13407 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
13408 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
13409 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
13410 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
13411 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF