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, debugging info will be written to ./trace and
27 * a quit signal will generate a core dump.
30 /* Tweak debug output verbosity here */
37 #define JOBS ENABLE_ASH_JOB_CONTROL
39 #include "busybox.h" /* for applet_names */
43 #include <sys/times.h>
45 #include "shell_common.h"
47 #if ENABLE_ASH_RANDOM_SUPPORT
50 # define CLEAR_RANDOM_T(rnd) ((void)0)
53 #include "NUM_APPLETS.h"
55 /* STANDALONE does not make sense, and won't compile */
56 # undef CONFIG_FEATURE_SH_STANDALONE
57 # undef ENABLE_FEATURE_SH_STANDALONE
58 # undef IF_FEATURE_SH_STANDALONE
59 # undef IF_NOT_FEATURE_SH_STANDALONE
60 # define ENABLE_FEATURE_SH_STANDALONE 0
61 # define IF_FEATURE_SH_STANDALONE(...)
62 # define IF_NOT_FEATURE_SH_STANDALONE(...) __VA_ARGS__
66 # define PIPE_BUF 4096 /* amount of buffering in a pipe */
70 # error "Do not even bother, ash will not run on NOMMU machine"
73 //applet:IF_ASH(APPLET(ash, _BB_DIR_BIN, _BB_SUID_DROP))
74 //applet:IF_FEATURE_SH_IS_ASH(APPLET_ODDNAME(sh, ash, _BB_DIR_BIN, _BB_SUID_DROP, sh))
75 //applet:IF_FEATURE_BASH_IS_ASH(APPLET_ODDNAME(bash, ash, _BB_DIR_BIN, _BB_SUID_DROP, bash))
77 //kbuild:lib-$(CONFIG_ASH) += ash.o ash_ptr_hack.o shell_common.o
78 //kbuild:lib-$(CONFIG_ASH_RANDOM_SUPPORT) += random.o
83 //config: depends on !NOMMU
85 //config: Tha 'ash' shell adds about 60k in the default configuration and is
86 //config: the most complete and most pedantically correct shell included with
87 //config: busybox. This shell is actually a derivative of the Debian 'dash'
88 //config: shell (by Herbert Xu), which was created by porting the 'ash' shell
89 //config: (written by Kenneth Almquist) from NetBSD.
91 //config:config ASH_BASH_COMPAT
92 //config: bool "bash-compatible extensions"
94 //config: depends on ASH
96 //config: Enable bash-compatible extensions.
98 //config:config ASH_JOB_CONTROL
99 //config: bool "Job control"
101 //config: depends on ASH
103 //config: Enable job control in the ash shell.
105 //config:config ASH_ALIAS
106 //config: bool "alias support"
108 //config: depends on ASH
110 //config: Enable alias support in the ash shell.
112 //config:config ASH_GETOPTS
113 //config: bool "Builtin getopt to parse positional parameters"
115 //config: depends on ASH
117 //config: Enable getopts builtin in the ash shell.
119 //config:config ASH_BUILTIN_ECHO
120 //config: bool "Builtin version of 'echo'"
122 //config: depends on ASH
124 //config: Enable support for echo, builtin to ash.
126 //config:config ASH_BUILTIN_PRINTF
127 //config: bool "Builtin version of 'printf'"
129 //config: depends on ASH
131 //config: Enable support for printf, builtin to ash.
133 //config:config ASH_BUILTIN_TEST
134 //config: bool "Builtin version of 'test'"
136 //config: depends on ASH
138 //config: Enable support for test, builtin to ash.
140 //config:config ASH_CMDCMD
141 //config: bool "'command' command to override shell builtins"
143 //config: depends on ASH
145 //config: Enable support for the ash 'command' builtin, which allows
146 //config: you to run the specified command with the specified arguments,
147 //config: even when there is an ash builtin command with the same name.
149 //config:config ASH_MAIL
150 //config: bool "Check for new mail on interactive shells"
152 //config: depends on ASH
154 //config: Enable "check for new mail" in the ash shell.
156 //config:config ASH_OPTIMIZE_FOR_SIZE
157 //config: bool "Optimize for size instead of speed"
159 //config: depends on ASH
161 //config: Compile ash for reduced size at the price of speed.
163 //config:config ASH_RANDOM_SUPPORT
164 //config: bool "Pseudorandom generator and $RANDOM variable"
166 //config: depends on ASH
168 //config: Enable pseudorandom generator and dynamic variable "$RANDOM".
169 //config: Each read of "$RANDOM" will generate a new pseudorandom value.
170 //config: You can reset the generator by using a specified start value.
171 //config: After "unset RANDOM" the generator will switch off and this
172 //config: variable will no longer have special treatment.
174 //config:config ASH_EXPAND_PRMT
175 //config: bool "Expand prompt string"
177 //config: depends on ASH
179 //config: "PS#" may contain volatile content, such as backquote commands.
180 //config: This option recreates the prompt string from the environment
181 //config: variable each time it is displayed.
184 //usage:#define ash_trivial_usage NOUSAGE_STR
185 //usage:#define ash_full_usage ""
186 //usage:#define sh_trivial_usage NOUSAGE_STR
187 //usage:#define sh_full_usage ""
188 //usage:#define bash_trivial_usage NOUSAGE_STR
189 //usage:#define bash_full_usage ""
192 /* ============ Hash table sizes. Configurable. */
196 #define CMDTABLESIZE 31 /* should be prime */
199 /* ============ Shell options */
201 static const char *const optletters_optnames[] = {
216 #if ENABLE_ASH_BASH_COMPAT
225 #define optletters(n) optletters_optnames[n][0]
226 #define optnames(n) (optletters_optnames[n] + 1)
228 enum { NOPTS = ARRAY_SIZE(optletters_optnames) };
231 /* ============ Misc data */
233 #define msg_illnum "Illegal number: %s"
236 * We enclose jmp_buf in a structure so that we can declare pointers to
237 * jump locations. The global variable handler contains the location to
238 * jump to when an exception occurs, and the global variable exception_type
239 * contains a code identifying the exception. To implement nested
240 * exception handlers, the user should save the value of handler on entry
241 * to an inner scope, set handler to point to a jmploc structure for the
242 * inner scope, and restore handler on exit from the scope.
248 struct globals_misc {
249 /* pid of main shell */
251 /* shell level: 0 for the main shell, 1 for its children, and so on */
253 #define rootshell (!shlvl)
254 char *minusc; /* argument to -c option */
256 char *curdir; // = nullstr; /* current working directory */
257 char *physdir; // = nullstr; /* physical working directory */
259 char *arg0; /* value of $0 */
261 struct jmploc *exception_handler;
263 volatile int suppress_int; /* counter */
264 volatile /*sig_atomic_t*/ smallint pending_int; /* 1 = got SIGINT */
265 /* last pending signal */
266 volatile /*sig_atomic_t*/ smallint pending_sig;
267 smallint exception_type; /* kind of exception (0..5) */
269 #define EXINT 0 /* SIGINT received */
270 #define EXERROR 1 /* a generic error */
271 #define EXSHELLPROC 2 /* execute a shell procedure */
272 #define EXEXEC 3 /* command execution failed */
273 #define EXEXIT 4 /* exit the shell */
274 #define EXSIG 5 /* trapped signal in wait(1) */
277 char nullstr[1]; /* zero length string */
280 #define eflag optlist[0]
281 #define fflag optlist[1]
282 #define Iflag optlist[2]
283 #define iflag optlist[3]
284 #define mflag optlist[4]
285 #define nflag optlist[5]
286 #define sflag optlist[6]
287 #define xflag optlist[7]
288 #define vflag optlist[8]
289 #define Cflag optlist[9]
290 #define aflag optlist[10]
291 #define bflag optlist[11]
292 #define uflag optlist[12]
293 #define viflag optlist[13]
294 #if ENABLE_ASH_BASH_COMPAT
295 # define pipefail optlist[14]
300 # define nolog optlist[14 + ENABLE_ASH_BASH_COMPAT]
301 # define debug optlist[15 + ENABLE_ASH_BASH_COMPAT]
304 /* trap handler commands */
306 * Sigmode records the current value of the signal handlers for the various
307 * modes. A value of zero means that the current handler is not known.
308 * S_HARD_IGN indicates that the signal was ignored on entry to the shell.
310 char sigmode[NSIG - 1];
311 #define S_DFL 1 /* default signal handling (SIG_DFL) */
312 #define S_CATCH 2 /* signal is caught */
313 #define S_IGN 3 /* signal is ignored (SIG_IGN) */
314 #define S_HARD_IGN 4 /* signal is ignored permenantly */
316 /* indicates specified signal received */
317 uint8_t gotsig[NSIG - 1]; /* offset by 1: "signal" 0 is meaningless */
318 uint8_t may_have_traps; /* 0: definitely no traps are set, 1: some traps may be set */
320 char **trap_ptr; /* used only by "trap hack" */
322 /* Rarely referenced stuff */
323 #if ENABLE_ASH_RANDOM_SUPPORT
326 pid_t backgndpid; /* pid of last background process */
327 smallint job_warning; /* user was warned about stopped jobs (can be 2, 1 or 0). */
329 extern struct globals_misc *const ash_ptr_to_globals_misc;
330 #define G_misc (*ash_ptr_to_globals_misc)
331 #define rootpid (G_misc.rootpid )
332 #define shlvl (G_misc.shlvl )
333 #define minusc (G_misc.minusc )
334 #define curdir (G_misc.curdir )
335 #define physdir (G_misc.physdir )
336 #define arg0 (G_misc.arg0 )
337 #define exception_handler (G_misc.exception_handler)
338 #define exception_type (G_misc.exception_type )
339 #define suppress_int (G_misc.suppress_int )
340 #define pending_int (G_misc.pending_int )
341 #define pending_sig (G_misc.pending_sig )
342 #define isloginsh (G_misc.isloginsh )
343 #define nullstr (G_misc.nullstr )
344 #define optlist (G_misc.optlist )
345 #define sigmode (G_misc.sigmode )
346 #define gotsig (G_misc.gotsig )
347 #define may_have_traps (G_misc.may_have_traps )
348 #define trap (G_misc.trap )
349 #define trap_ptr (G_misc.trap_ptr )
350 #define random_gen (G_misc.random_gen )
351 #define backgndpid (G_misc.backgndpid )
352 #define job_warning (G_misc.job_warning)
353 #define INIT_G_misc() do { \
354 (*(struct globals_misc**)&ash_ptr_to_globals_misc) = xzalloc(sizeof(G_misc)); \
362 /* ============ DEBUG */
364 static void trace_printf(const char *fmt, ...);
365 static void trace_vprintf(const char *fmt, va_list va);
366 # define TRACE(param) trace_printf param
367 # define TRACEV(param) trace_vprintf param
368 # define close(fd) do { \
370 if (close(dfd) < 0) \
371 bb_error_msg("bug on %d: closing %d(0x%x)", \
372 __LINE__, dfd, dfd); \
375 # define TRACE(param)
376 # define TRACEV(param)
380 /* ============ Utility functions */
381 #define xbarrier() do { __asm__ __volatile__ ("": : :"memory"); } while (0)
383 static int isdigit_str9(const char *str)
385 int maxlen = 9 + 1; /* max 9 digits: 999999999 */
386 while (--maxlen && isdigit(*str))
388 return (*str == '\0');
391 static const char *var_end(const char *var)
400 /* ============ Interrupts / exceptions */
402 * These macros allow the user to suspend the handling of interrupt signals
403 * over a period of time. This is similar to SIGHOLD or to sigblock, but
404 * much more efficient and portable. (But hacking the kernel is so much
405 * more fun than worrying about efficiency and portability. :-))
407 #define INT_OFF do { \
413 * Called to raise an exception. Since C doesn't include exceptions, we
414 * just do a longjmp to the exception handler. The type of exception is
415 * stored in the global variable "exception_type".
417 static void raise_exception(int) NORETURN;
419 raise_exception(int e)
422 if (exception_handler == NULL)
427 longjmp(exception_handler->loc, 1);
430 #define raise_exception(e) do { \
431 TRACE(("raising exception %d on line %d\n", (e), __LINE__)); \
432 raise_exception(e); \
437 * Called from trap.c when a SIGINT is received. (If the user specifies
438 * that SIGINT is to be trapped or ignored using the trap builtin, then
439 * this routine is not called.) Suppressint is nonzero when interrupts
440 * are held using the INT_OFF macro. (The test for iflag is just
441 * defensive programming.)
443 static void raise_interrupt(void) NORETURN;
445 raise_interrupt(void)
450 /* Signal is not automatically unmasked after it is raised,
451 * do it ourself - unmask all signals */
452 sigprocmask_allsigs(SIG_UNBLOCK);
453 /* pending_sig = 0; - now done in signal_handler() */
456 if (gotsig[SIGINT - 1] && !trap[SIGINT]) {
457 if (!(rootshell && iflag)) {
458 /* Kill ourself with SIGINT */
459 signal(SIGINT, SIG_DFL);
464 raise_exception(ex_type);
468 #define raise_interrupt() do { \
469 TRACE(("raising interrupt on line %d\n", __LINE__)); \
474 static IF_ASH_OPTIMIZE_FOR_SIZE(inline) void
478 if (--suppress_int == 0 && pending_int) {
482 #define INT_ON int_on()
483 static IF_ASH_OPTIMIZE_FOR_SIZE(inline) void
491 #define FORCE_INT_ON force_int_on()
493 #define SAVE_INT(v) ((v) = suppress_int)
495 #define RESTORE_INT(v) do { \
497 suppress_int = (v); \
498 if (suppress_int == 0 && pending_int) \
503 /* ============ Stdout/stderr output */
506 outstr(const char *p, FILE *file)
514 flush_stdout_stderr(void)
522 outcslow(int c, FILE *dest)
530 static int out1fmt(const char *, ...) __attribute__((__format__(__printf__,1,2)));
532 out1fmt(const char *fmt, ...)
539 r = vprintf(fmt, ap);
545 static int fmtstr(char *, size_t, const char *, ...) __attribute__((__format__(__printf__,3,4)));
547 fmtstr(char *outbuf, size_t length, const char *fmt, ...)
554 ret = vsnprintf(outbuf, length, fmt, ap);
561 out1str(const char *p)
567 out2str(const char *p)
570 flush_stdout_stderr();
574 /* ============ Parser structures */
576 /* control characters in argument strings */
577 #define CTL_FIRST CTLESC
578 #define CTLESC ((unsigned char)'\201') /* escape next character */
579 #define CTLVAR ((unsigned char)'\202') /* variable defn */
580 #define CTLENDVAR ((unsigned char)'\203')
581 #define CTLBACKQ ((unsigned char)'\204')
582 #define CTLQUOTE 01 /* ored with CTLBACKQ code if in quotes */
583 /* CTLBACKQ | CTLQUOTE == '\205' */
584 #define CTLARI ((unsigned char)'\206') /* arithmetic expression */
585 #define CTLENDARI ((unsigned char)'\207')
586 #define CTLQUOTEMARK ((unsigned char)'\210')
587 #define CTL_LAST CTLQUOTEMARK
589 /* variable substitution byte (follows CTLVAR) */
590 #define VSTYPE 0x0f /* type of variable substitution */
591 #define VSNUL 0x10 /* colon--treat the empty string as unset */
592 #define VSQUOTE 0x80 /* inside double quotes--suppress splitting */
594 /* values of VSTYPE field */
595 #define VSNORMAL 0x1 /* normal variable: $var or ${var} */
596 #define VSMINUS 0x2 /* ${var-text} */
597 #define VSPLUS 0x3 /* ${var+text} */
598 #define VSQUESTION 0x4 /* ${var?message} */
599 #define VSASSIGN 0x5 /* ${var=text} */
600 #define VSTRIMRIGHT 0x6 /* ${var%pattern} */
601 #define VSTRIMRIGHTMAX 0x7 /* ${var%%pattern} */
602 #define VSTRIMLEFT 0x8 /* ${var#pattern} */
603 #define VSTRIMLEFTMAX 0x9 /* ${var##pattern} */
604 #define VSLENGTH 0xa /* ${#var} */
605 #if ENABLE_ASH_BASH_COMPAT
606 #define VSSUBSTR 0xc /* ${var:position:length} */
607 #define VSREPLACE 0xd /* ${var/pattern/replacement} */
608 #define VSREPLACEALL 0xe /* ${var//pattern/replacement} */
611 static const char dolatstr[] ALIGN1 = {
612 CTLVAR, VSNORMAL|VSQUOTE, '@', '=', '\0'
632 #if ENABLE_ASH_BASH_COMPAT
649 smallint type; /* Nxxxx */
652 union node *redirect;
657 smallint pipe_backgnd;
658 struct nodelist *cmdlist;
664 union node *redirect;
677 union node *elsepart;
704 struct nodelist *backquote;
707 /* nfile and ndup layout must match!
708 * NTOFD (>&fdnum) uses ndup structure, but we may discover mid-flight
709 * that it is actually NTO2 (>&file), and change its type.
726 char *_unused_expfname;
745 struct nredir nredir;
746 struct nbinary nbinary;
750 struct nclist nclist;
759 * NODE_EOF is returned by parsecmd when it encounters an end of file.
760 * It must be distinct from NULL.
762 #define NODE_EOF ((union node *) -1L)
765 struct nodelist *next;
778 freefunc(struct funcnode *f)
780 if (f && --f->count < 0)
785 /* ============ Debugging output */
789 static FILE *tracefile;
792 trace_printf(const char *fmt, ...)
799 fprintf(tracefile, "%u ", (int) time(NULL));
801 fprintf(tracefile, "[%u] ", (int) getpid());
803 fprintf(tracefile, "pending s:%d i:%d(supp:%d) ", pending_sig, pending_int, suppress_int);
805 vfprintf(tracefile, fmt, va);
810 trace_vprintf(const char *fmt, va_list va)
815 fprintf(tracefile, "%u ", (int) time(NULL));
817 fprintf(tracefile, "[%u] ", (int) getpid());
819 fprintf(tracefile, "pending s:%d i:%d(supp:%d) ", pending_sig, pending_int, suppress_int);
820 vfprintf(tracefile, fmt, va);
824 trace_puts(const char *s)
832 trace_puts_quoted(char *s)
839 putc('"', tracefile);
840 for (p = s; *p; p++) {
841 switch ((unsigned char)*p) {
842 case '\n': c = 'n'; goto backslash;
843 case '\t': c = 't'; goto backslash;
844 case '\r': c = 'r'; goto backslash;
845 case '\"': c = '\"'; goto backslash;
846 case '\\': c = '\\'; goto backslash;
847 case CTLESC: c = 'e'; goto backslash;
848 case CTLVAR: c = 'v'; goto backslash;
849 case CTLVAR+CTLQUOTE: c = 'V'; goto backslash;
850 case CTLBACKQ: c = 'q'; goto backslash;
851 case CTLBACKQ+CTLQUOTE: c = 'Q'; goto backslash;
853 putc('\\', tracefile);
857 if (*p >= ' ' && *p <= '~')
860 putc('\\', tracefile);
861 putc((*p >> 6) & 03, tracefile);
862 putc((*p >> 3) & 07, tracefile);
863 putc(*p & 07, tracefile);
868 putc('"', tracefile);
872 trace_puts_args(char **ap)
879 trace_puts_quoted(*ap);
881 putc('\n', tracefile);
884 putc(' ', tracefile);
899 /* leave open because libedit might be using it */
902 strcpy(s, "./trace");
904 if (!freopen(s, "a", tracefile)) {
905 fprintf(stderr, "Can't re-open %s\n", s);
910 tracefile = fopen(s, "a");
911 if (tracefile == NULL) {
912 fprintf(stderr, "Can't open %s\n", s);
918 flags = fcntl(fileno(tracefile), F_GETFL);
920 fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND);
922 setlinebuf(tracefile);
923 fputs("\nTracing started.\n", tracefile);
927 indent(int amount, char *pfx, FILE *fp)
931 for (i = 0; i < amount; i++) {
932 if (pfx && i == amount - 1)
938 /* little circular references here... */
939 static void shtree(union node *n, int ind, char *pfx, FILE *fp);
942 sharg(union node *arg, FILE *fp)
945 struct nodelist *bqlist;
946 unsigned char subtype;
948 if (arg->type != NARG) {
949 out1fmt("<node type %d>\n", arg->type);
952 bqlist = arg->narg.backquote;
953 for (p = arg->narg.text; *p; p++) {
954 switch ((unsigned char)*p) {
962 if (subtype == VSLENGTH)
971 switch (subtype & VSTYPE) {
1004 out1fmt("<subtype %d>", subtype);
1011 case CTLBACKQ|CTLQUOTE:
1014 shtree(bqlist->n, -1, NULL, fp);
1025 shcmd(union node *cmd, FILE *fp)
1033 for (np = cmd->ncmd.args; np; np = np->narg.next) {
1039 for (np = cmd->ncmd.redirect; np; np = np->nfile.next) {
1043 switch (np->nfile.type) {
1044 case NTO: s = ">>"+1; dftfd = 1; break;
1045 case NCLOBBER: s = ">|"; dftfd = 1; break;
1046 case NAPPEND: s = ">>"; dftfd = 1; break;
1047 #if ENABLE_ASH_BASH_COMPAT
1050 case NTOFD: s = ">&"; dftfd = 1; break;
1051 case NFROM: s = "<"; break;
1052 case NFROMFD: s = "<&"; break;
1053 case NFROMTO: s = "<>"; break;
1054 default: s = "*error*"; break;
1056 if (np->nfile.fd != dftfd)
1057 fprintf(fp, "%d", np->nfile.fd);
1059 if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) {
1060 fprintf(fp, "%d", np->ndup.dupfd);
1062 sharg(np->nfile.fname, fp);
1069 shtree(union node *n, int ind, char *pfx, FILE *fp)
1071 struct nodelist *lp;
1077 indent(ind, pfx, fp);
1079 if (n == NODE_EOF) {
1094 shtree(n->nbinary.ch1, ind, NULL, fp);
1097 shtree(n->nbinary.ch2, ind, NULL, fp);
1105 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
1106 shtree(lp->n, 0, NULL, fp);
1110 if (n->npipe.pipe_backgnd)
1116 fprintf(fp, "<node type %d>", n->type);
1124 showtree(union node *n)
1126 trace_puts("showtree called\n");
1127 shtree(n, 1, NULL, stderr);
1133 /* ============ Parser data */
1136 * ash_vmsg() needs parsefile->fd, hence parsefile definition is moved up.
1139 struct strlist *next;
1146 struct strpush *prev; /* preceding string on stack */
1148 int prev_left_in_line;
1149 #if ENABLE_ASH_ALIAS
1150 struct alias *ap; /* if push was associated with an alias */
1152 char *string; /* remember the string since it may change */
1156 struct parsefile *prev; /* preceding file on stack */
1157 int linno; /* current line */
1158 int pf_fd; /* file descriptor (or -1 if string) */
1159 int left_in_line; /* number of chars left in this line */
1160 int left_in_buffer; /* number of chars left in this buffer past the line */
1161 char *next_to_pgetc; /* next char in buffer */
1162 char *buf; /* input buffer */
1163 struct strpush *strpush; /* for pushing strings at this level */
1164 struct strpush basestrpush; /* so pushing one is fast */
1167 static struct parsefile basepf; /* top level input file */
1168 static struct parsefile *g_parsefile = &basepf; /* current input file */
1169 static int startlinno; /* line # where last token started */
1170 static char *commandname; /* currently executing command */
1171 static struct strlist *cmdenviron; /* environment for builtin command */
1172 static uint8_t exitstatus; /* exit status of last command */
1175 /* ============ Message printing */
1178 ash_vmsg(const char *msg, va_list ap)
1180 fprintf(stderr, "%s: ", arg0);
1182 if (strcmp(arg0, commandname))
1183 fprintf(stderr, "%s: ", commandname);
1184 if (!iflag || g_parsefile->pf_fd > 0)
1185 fprintf(stderr, "line %d: ", startlinno);
1187 vfprintf(stderr, msg, ap);
1188 outcslow('\n', stderr);
1192 * Exverror is called to raise the error exception. If the second argument
1193 * is not NULL then error prints an error message using printf style
1194 * formatting. It then raises the error exception.
1196 static void ash_vmsg_and_raise(int, const char *, va_list) NORETURN;
1198 ash_vmsg_and_raise(int cond, const char *msg, va_list ap)
1202 TRACE(("ash_vmsg_and_raise(%d, \"", cond));
1204 TRACE(("\") pid=%d\n", getpid()));
1206 TRACE(("ash_vmsg_and_raise(%d, NULL) pid=%d\n", cond, getpid()));
1211 flush_stdout_stderr();
1212 raise_exception(cond);
1216 static void ash_msg_and_raise_error(const char *, ...) NORETURN;
1218 ash_msg_and_raise_error(const char *msg, ...)
1223 ash_vmsg_and_raise(EXERROR, msg, ap);
1228 static void raise_error_syntax(const char *) NORETURN;
1230 raise_error_syntax(const char *msg)
1232 ash_msg_and_raise_error("syntax error: %s", msg);
1236 static void ash_msg_and_raise(int, const char *, ...) NORETURN;
1238 ash_msg_and_raise(int cond, const char *msg, ...)
1243 ash_vmsg_and_raise(cond, msg, ap);
1249 * error/warning routines for external builtins
1252 ash_msg(const char *fmt, ...)
1262 * Return a string describing an error. The returned string may be a
1263 * pointer to a static buffer that will be overwritten on the next call.
1264 * Action describes the operation that got the error.
1267 errmsg(int e, const char *em)
1269 if (e == ENOENT || e == ENOTDIR) {
1276 /* ============ Memory allocation */
1279 /* I consider these wrappers nearly useless:
1280 * ok, they return you to nearest exception handler, but
1281 * how much memory do you leak in the process, making
1282 * memory starvation worse?
1285 ckrealloc(void * p, size_t nbytes)
1287 p = realloc(p, nbytes);
1289 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1294 ckmalloc(size_t nbytes)
1296 return ckrealloc(NULL, nbytes);
1300 ckzalloc(size_t nbytes)
1302 return memset(ckmalloc(nbytes), 0, nbytes);
1306 ckstrdup(const char *s)
1308 char *p = strdup(s);
1310 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1314 /* Using bbox equivalents. They exit if out of memory */
1315 # define ckrealloc xrealloc
1316 # define ckmalloc xmalloc
1317 # define ckzalloc xzalloc
1318 # define ckstrdup xstrdup
1322 * It appears that grabstackstr() will barf with such alignments
1323 * because stalloc() will return a string allocated in a new stackblock.
1325 #define SHELL_ALIGN(nbytes) (((nbytes) + SHELL_SIZE) & ~SHELL_SIZE)
1327 /* Most machines require the value returned from malloc to be aligned
1328 * in some way. The following macro will get this right
1329 * on many machines. */
1330 SHELL_SIZE = sizeof(union { int i; char *cp; double d; }) - 1,
1331 /* Minimum size of a block */
1332 MINSIZE = SHELL_ALIGN(504),
1335 struct stack_block {
1336 struct stack_block *prev;
1337 char space[MINSIZE];
1341 struct stack_block *stackp;
1344 struct stackmark *marknext;
1348 struct globals_memstack {
1349 struct stack_block *g_stackp; // = &stackbase;
1350 struct stackmark *markp;
1351 char *g_stacknxt; // = stackbase.space;
1352 char *sstrend; // = stackbase.space + MINSIZE;
1353 size_t g_stacknleft; // = MINSIZE;
1354 int herefd; // = -1;
1355 struct stack_block stackbase;
1357 extern struct globals_memstack *const ash_ptr_to_globals_memstack;
1358 #define G_memstack (*ash_ptr_to_globals_memstack)
1359 #define g_stackp (G_memstack.g_stackp )
1360 #define markp (G_memstack.markp )
1361 #define g_stacknxt (G_memstack.g_stacknxt )
1362 #define sstrend (G_memstack.sstrend )
1363 #define g_stacknleft (G_memstack.g_stacknleft)
1364 #define herefd (G_memstack.herefd )
1365 #define stackbase (G_memstack.stackbase )
1366 #define INIT_G_memstack() do { \
1367 (*(struct globals_memstack**)&ash_ptr_to_globals_memstack) = xzalloc(sizeof(G_memstack)); \
1369 g_stackp = &stackbase; \
1370 g_stacknxt = stackbase.space; \
1371 g_stacknleft = MINSIZE; \
1372 sstrend = stackbase.space + MINSIZE; \
1377 #define stackblock() ((void *)g_stacknxt)
1378 #define stackblocksize() g_stacknleft
1381 * Parse trees for commands are allocated in lifo order, so we use a stack
1382 * to make this more efficient, and also to avoid all sorts of exception
1383 * handling code to handle interrupts in the middle of a parse.
1385 * The size 504 was chosen because the Ultrix malloc handles that size
1389 stalloc(size_t nbytes)
1394 aligned = SHELL_ALIGN(nbytes);
1395 if (aligned > g_stacknleft) {
1398 struct stack_block *sp;
1400 blocksize = aligned;
1401 if (blocksize < MINSIZE)
1402 blocksize = MINSIZE;
1403 len = sizeof(struct stack_block) - MINSIZE + blocksize;
1404 if (len < blocksize)
1405 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1408 sp->prev = g_stackp;
1409 g_stacknxt = sp->space;
1410 g_stacknleft = blocksize;
1411 sstrend = g_stacknxt + blocksize;
1416 g_stacknxt += aligned;
1417 g_stacknleft -= aligned;
1422 stzalloc(size_t nbytes)
1424 return memset(stalloc(nbytes), 0, nbytes);
1431 if (!p || (g_stacknxt < (char *)p) || ((char *)p < g_stackp->space)) {
1432 write(STDERR_FILENO, "stunalloc\n", 10);
1436 g_stacknleft += g_stacknxt - (char *)p;
1441 * Like strdup but works with the ash stack.
1444 ststrdup(const char *p)
1446 size_t len = strlen(p) + 1;
1447 return memcpy(stalloc(len), p, len);
1451 setstackmark(struct stackmark *mark)
1453 mark->stackp = g_stackp;
1454 mark->stacknxt = g_stacknxt;
1455 mark->stacknleft = g_stacknleft;
1456 mark->marknext = markp;
1461 popstackmark(struct stackmark *mark)
1463 struct stack_block *sp;
1469 markp = mark->marknext;
1470 while (g_stackp != mark->stackp) {
1472 g_stackp = sp->prev;
1475 g_stacknxt = mark->stacknxt;
1476 g_stacknleft = mark->stacknleft;
1477 sstrend = mark->stacknxt + mark->stacknleft;
1482 * When the parser reads in a string, it wants to stick the string on the
1483 * stack and only adjust the stack pointer when it knows how big the
1484 * string is. Stackblock (defined in stack.h) returns a pointer to a block
1485 * of space on top of the stack and stackblocklen returns the length of
1486 * this block. Growstackblock will grow this space by at least one byte,
1487 * possibly moving it (like realloc). Grabstackblock actually allocates the
1488 * part of the block that has been used.
1491 growstackblock(void)
1495 newlen = g_stacknleft * 2;
1496 if (newlen < g_stacknleft)
1497 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1501 if (g_stacknxt == g_stackp->space && g_stackp != &stackbase) {
1502 struct stack_block *oldstackp;
1503 struct stackmark *xmark;
1504 struct stack_block *sp;
1505 struct stack_block *prevstackp;
1509 oldstackp = g_stackp;
1511 prevstackp = sp->prev;
1512 grosslen = newlen + sizeof(struct stack_block) - MINSIZE;
1513 sp = ckrealloc(sp, grosslen);
1514 sp->prev = prevstackp;
1516 g_stacknxt = sp->space;
1517 g_stacknleft = newlen;
1518 sstrend = sp->space + newlen;
1521 * Stack marks pointing to the start of the old block
1522 * must be relocated to point to the new block
1525 while (xmark != NULL && xmark->stackp == oldstackp) {
1526 xmark->stackp = g_stackp;
1527 xmark->stacknxt = g_stacknxt;
1528 xmark->stacknleft = g_stacknleft;
1529 xmark = xmark->marknext;
1533 char *oldspace = g_stacknxt;
1534 size_t oldlen = g_stacknleft;
1535 char *p = stalloc(newlen);
1537 /* free the space we just allocated */
1538 g_stacknxt = memcpy(p, oldspace, oldlen);
1539 g_stacknleft += newlen;
1544 grabstackblock(size_t len)
1546 len = SHELL_ALIGN(len);
1548 g_stacknleft -= len;
1552 * The following routines are somewhat easier to use than the above.
1553 * The user declares a variable of type STACKSTR, which may be declared
1554 * to be a register. The macro STARTSTACKSTR initializes things. Then
1555 * the user uses the macro STPUTC to add characters to the string. In
1556 * effect, STPUTC(c, p) is the same as *p++ = c except that the stack is
1557 * grown as necessary. When the user is done, she can just leave the
1558 * string there and refer to it using stackblock(). Or she can allocate
1559 * the space for it using grabstackstr(). If it is necessary to allow
1560 * someone else to use the stack temporarily and then continue to grow
1561 * the string, the user should use grabstack to allocate the space, and
1562 * then call ungrabstr(p) to return to the previous mode of operation.
1564 * USTPUTC is like STPUTC except that it doesn't check for overflow.
1565 * CHECKSTACKSPACE can be called before USTPUTC to ensure that there
1566 * is space for at least one character.
1571 size_t len = stackblocksize();
1572 if (herefd >= 0 && len >= 1024) {
1573 full_write(herefd, stackblock(), len);
1574 return stackblock();
1577 return (char *)stackblock() + len;
1581 * Called from CHECKSTRSPACE.
1584 makestrspace(size_t newlen, char *p)
1586 size_t len = p - g_stacknxt;
1587 size_t size = stackblocksize();
1592 size = stackblocksize();
1594 if (nleft >= newlen)
1598 return (char *)stackblock() + len;
1602 stack_nputstr(const char *s, size_t n, char *p)
1604 p = makestrspace(n, p);
1605 p = (char *)memcpy(p, s, n) + n;
1610 stack_putstr(const char *s, char *p)
1612 return stack_nputstr(s, strlen(s), p);
1616 _STPUTC(int c, char *p)
1624 #define STARTSTACKSTR(p) ((p) = stackblock())
1625 #define STPUTC(c, p) ((p) = _STPUTC((c), (p)))
1626 #define CHECKSTRSPACE(n, p) do { \
1629 size_t m = sstrend - q; \
1631 (p) = makestrspace(l, q); \
1633 #define USTPUTC(c, p) (*(p)++ = (c))
1634 #define STACKSTRNUL(p) do { \
1635 if ((p) == sstrend) \
1636 (p) = growstackstr(); \
1639 #define STUNPUTC(p) (--(p))
1640 #define STTOPC(p) ((p)[-1])
1641 #define STADJUST(amount, p) ((p) += (amount))
1643 #define grabstackstr(p) stalloc((char *)(p) - (char *)stackblock())
1644 #define ungrabstackstr(s, p) stunalloc(s)
1645 #define stackstrend() ((void *)sstrend)
1648 /* ============ String helpers */
1651 * prefix -- see if pfx is a prefix of string.
1654 prefix(const char *string, const char *pfx)
1657 if (*pfx++ != *string++)
1660 return (char *) string;
1664 * Check for a valid number. This should be elsewhere.
1667 is_number(const char *p)
1672 } while (*++p != '\0');
1677 * Convert a string of digits to an integer, printing an error message on
1681 number(const char *s)
1684 ash_msg_and_raise_error(msg_illnum, s);
1689 * Produce a possibly single quoted string suitable as input to the shell.
1690 * The return string is allocated on the stack.
1693 single_quote(const char *s)
1703 len = strchrnul(s, '\'') - s;
1705 q = p = makestrspace(len + 3, p);
1708 q = (char *)memcpy(q, s, len) + len;
1717 do len++; while (*++s == '\'');
1719 q = p = makestrspace(len + 3, p);
1722 q = (char *)memcpy(q, s - len, len) + len;
1730 return stackblock();
1734 /* ============ nextopt */
1736 static char **argptr; /* argument list for builtin commands */
1737 static char *optionarg; /* set by nextopt (like getopt) */
1738 static char *optptr; /* used by nextopt */
1741 * XXX - should get rid of. Have all builtins use getopt(3).
1742 * The library getopt must have the BSD extension static variable
1743 * "optreset", otherwise it can't be used within the shell safely.
1745 * Standard option processing (a la getopt) for builtin routines.
1746 * The only argument that is passed to nextopt is the option string;
1747 * the other arguments are unnecessary. It returns the character,
1748 * or '\0' on end of input.
1751 nextopt(const char *optstring)
1758 if (p == NULL || *p == '\0') {
1759 /* We ate entire "-param", take next one */
1765 if (*++p == '\0') /* just "-" ? */
1768 if (LONE_DASH(p)) /* "--" ? */
1770 /* p => next "-param" */
1772 /* p => some option char in the middle of a "-param" */
1774 for (q = optstring; *q != c;) {
1776 ash_msg_and_raise_error("illegal option -%c", c);
1784 ash_msg_and_raise_error("no arg for -%c option", c);
1794 /* ============ Shell variables */
1797 * The parsefile structure pointed to by the global variable parsefile
1798 * contains information about the current file being read.
1801 int nparam; /* # of positional parameters (without $0) */
1802 #if ENABLE_ASH_GETOPTS
1803 int optind; /* next parameter to be processed by getopts */
1804 int optoff; /* used by getopts */
1806 unsigned char malloced; /* if parameter list dynamically allocated */
1807 char **p; /* parameter list */
1811 * Free the list of positional parameters.
1814 freeparam(volatile struct shparam *param)
1816 if (param->malloced) {
1818 ap = ap1 = param->p;
1825 #if ENABLE_ASH_GETOPTS
1826 static void FAST_FUNC getoptsreset(const char *value);
1830 struct var *next; /* next entry in hash list */
1831 int flags; /* flags are defined above */
1832 const char *var_text; /* name=value */
1833 void (*var_func)(const char *) FAST_FUNC; /* function to be called when */
1834 /* the variable gets set/unset */
1838 struct localvar *next; /* next local variable in list */
1839 struct var *vp; /* the variable that was made local */
1840 int flags; /* saved flags */
1841 const char *text; /* saved text */
1845 #define VEXPORT 0x01 /* variable is exported */
1846 #define VREADONLY 0x02 /* variable cannot be modified */
1847 #define VSTRFIXED 0x04 /* variable struct is statically allocated */
1848 #define VTEXTFIXED 0x08 /* text is statically allocated */
1849 #define VSTACK 0x10 /* text is allocated on the stack */
1850 #define VUNSET 0x20 /* the variable is not set */
1851 #define VNOFUNC 0x40 /* don't call the callback function */
1852 #define VNOSET 0x80 /* do not set variable - just readonly test */
1853 #define VNOSAVE 0x100 /* when text is on the heap before setvareq */
1854 #if ENABLE_ASH_RANDOM_SUPPORT
1855 # define VDYNAMIC 0x200 /* dynamic variable */
1861 /* Need to be before varinit_data[] */
1862 #if ENABLE_LOCALE_SUPPORT
1863 static void FAST_FUNC
1864 change_lc_all(const char *value)
1866 if (value && *value != '\0')
1867 setlocale(LC_ALL, value);
1869 static void FAST_FUNC
1870 change_lc_ctype(const char *value)
1872 if (value && *value != '\0')
1873 setlocale(LC_CTYPE, value);
1877 static void chkmail(void);
1878 static void changemail(const char *) FAST_FUNC;
1880 static void changepath(const char *) FAST_FUNC;
1881 #if ENABLE_ASH_RANDOM_SUPPORT
1882 static void change_random(const char *) FAST_FUNC;
1885 static const struct {
1887 const char *var_text;
1888 void (*var_func)(const char *) FAST_FUNC;
1889 } varinit_data[] = {
1890 { VSTRFIXED|VTEXTFIXED , defifsvar , NULL },
1892 { VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL" , changemail },
1893 { VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH" , changemail },
1895 { VSTRFIXED|VTEXTFIXED , bb_PATH_root_path, changepath },
1896 { VSTRFIXED|VTEXTFIXED , "PS1=$ " , NULL },
1897 { VSTRFIXED|VTEXTFIXED , "PS2=> " , NULL },
1898 { VSTRFIXED|VTEXTFIXED , "PS4=+ " , NULL },
1899 #if ENABLE_ASH_GETOPTS
1900 { VSTRFIXED|VTEXTFIXED , "OPTIND=1" , getoptsreset },
1902 #if ENABLE_ASH_RANDOM_SUPPORT
1903 { VSTRFIXED|VTEXTFIXED|VUNSET|VDYNAMIC, "RANDOM", change_random },
1905 #if ENABLE_LOCALE_SUPPORT
1906 { VSTRFIXED|VTEXTFIXED|VUNSET, "LC_ALL" , change_lc_all },
1907 { VSTRFIXED|VTEXTFIXED|VUNSET, "LC_CTYPE" , change_lc_ctype },
1909 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
1910 { VSTRFIXED|VTEXTFIXED|VUNSET, "HISTFILE" , NULL },
1916 struct globals_var {
1917 struct shparam shellparam; /* $@ current positional parameters */
1918 struct redirtab *redirlist;
1920 int preverrout_fd; /* save fd2 before print debug if xflag is set. */
1921 struct var *vartab[VTABSIZE];
1922 struct var varinit[ARRAY_SIZE(varinit_data)];
1924 extern struct globals_var *const ash_ptr_to_globals_var;
1925 #define G_var (*ash_ptr_to_globals_var)
1926 #define shellparam (G_var.shellparam )
1927 //#define redirlist (G_var.redirlist )
1928 #define g_nullredirs (G_var.g_nullredirs )
1929 #define preverrout_fd (G_var.preverrout_fd)
1930 #define vartab (G_var.vartab )
1931 #define varinit (G_var.varinit )
1932 #define INIT_G_var() do { \
1934 (*(struct globals_var**)&ash_ptr_to_globals_var) = xzalloc(sizeof(G_var)); \
1936 for (i = 0; i < ARRAY_SIZE(varinit_data); i++) { \
1937 varinit[i].flags = varinit_data[i].flags; \
1938 varinit[i].var_text = varinit_data[i].var_text; \
1939 varinit[i].var_func = varinit_data[i].var_func; \
1943 #define vifs varinit[0]
1945 # define vmail (&vifs)[1]
1946 # define vmpath (&vmail)[1]
1947 # define vpath (&vmpath)[1]
1949 # define vpath (&vifs)[1]
1951 #define vps1 (&vpath)[1]
1952 #define vps2 (&vps1)[1]
1953 #define vps4 (&vps2)[1]
1954 #if ENABLE_ASH_GETOPTS
1955 # define voptind (&vps4)[1]
1956 # if ENABLE_ASH_RANDOM_SUPPORT
1957 # define vrandom (&voptind)[1]
1960 # if ENABLE_ASH_RANDOM_SUPPORT
1961 # define vrandom (&vps4)[1]
1966 * The following macros access the values of the above variables.
1967 * They have to skip over the name. They return the null string
1968 * for unset variables.
1970 #define ifsval() (vifs.var_text + 4)
1971 #define ifsset() ((vifs.flags & VUNSET) == 0)
1973 # define mailval() (vmail.var_text + 5)
1974 # define mpathval() (vmpath.var_text + 9)
1975 # define mpathset() ((vmpath.flags & VUNSET) == 0)
1977 #define pathval() (vpath.var_text + 5)
1978 #define ps1val() (vps1.var_text + 4)
1979 #define ps2val() (vps2.var_text + 4)
1980 #define ps4val() (vps4.var_text + 4)
1981 #if ENABLE_ASH_GETOPTS
1982 # define optindval() (voptind.var_text + 7)
1986 #define is_name(c) ((c) == '_' || isalpha((unsigned char)(c)))
1987 #define is_in_name(c) ((c) == '_' || isalnum((unsigned char)(c)))
1989 #if ENABLE_ASH_GETOPTS
1990 static void FAST_FUNC
1991 getoptsreset(const char *value)
1993 shellparam.optind = number(value);
1994 shellparam.optoff = -1;
1999 * Return of a legal variable name (a letter or underscore followed by zero or
2000 * more letters, underscores, and digits).
2002 static char* FAST_FUNC
2003 endofname(const char *name)
2011 if (!is_in_name(*p))
2018 * Compares two strings up to the first = or '\0'. The first
2019 * string must be terminated by '='; the second may be terminated by
2020 * either '=' or '\0'.
2023 varcmp(const char *p, const char *q)
2027 while ((c = *p) == (d = *q)) {
2042 * Find the appropriate entry in the hash table from the name.
2044 static struct var **
2045 hashvar(const char *p)
2049 hashval = ((unsigned char) *p) << 4;
2050 while (*p && *p != '=')
2051 hashval += (unsigned char) *p++;
2052 return &vartab[hashval % VTABSIZE];
2056 vpcmp(const void *a, const void *b)
2058 return varcmp(*(const char **)a, *(const char **)b);
2062 * This routine initializes the builtin variables.
2072 * PS1 depends on uid
2074 #if ENABLE_FEATURE_EDITING && ENABLE_FEATURE_EDITING_FANCY_PROMPT
2075 vps1.var_text = "PS1=\\w \\$ ";
2078 vps1.var_text = "PS1=# ";
2081 end = vp + ARRAY_SIZE(varinit);
2083 vpp = hashvar(vp->var_text);
2086 } while (++vp < end);
2089 static struct var **
2090 findvar(struct var **vpp, const char *name)
2092 for (; *vpp; vpp = &(*vpp)->next) {
2093 if (varcmp((*vpp)->var_text, name) == 0) {
2101 * Find the value of a variable. Returns NULL if not set.
2103 static const char* FAST_FUNC
2104 lookupvar(const char *name)
2108 v = *findvar(hashvar(name), name);
2110 #if ENABLE_ASH_RANDOM_SUPPORT
2112 * Dynamic variables are implemented roughly the same way they are
2113 * in bash. Namely, they're "special" so long as they aren't unset.
2114 * As soon as they're unset, they're no longer dynamic, and dynamic
2115 * lookup will no longer happen at that point. -- PFM.
2117 if (v->flags & VDYNAMIC)
2120 if (!(v->flags & VUNSET))
2121 return var_end(v->var_text);
2127 * Search the environment of a builtin command.
2130 bltinlookup(const char *name)
2134 for (sp = cmdenviron; sp; sp = sp->next) {
2135 if (varcmp(sp->text, name) == 0)
2136 return var_end(sp->text);
2138 return lookupvar(name);
2142 * Same as setvar except that the variable and value are passed in
2143 * the first argument as name=value. Since the first argument will
2144 * be actually stored in the table, it should not be a string that
2146 * Called with interrupts off.
2149 setvareq(char *s, int flags)
2151 struct var *vp, **vpp;
2154 flags |= (VEXPORT & (((unsigned) (1 - aflag)) - 1));
2155 vp = *findvar(vpp, s);
2157 if ((vp->flags & (VREADONLY|VDYNAMIC)) == VREADONLY) {
2160 if (flags & VNOSAVE)
2163 ash_msg_and_raise_error("%.*s: is read only", strchrnul(n, '=') - n, n);
2169 if (vp->var_func && !(flags & VNOFUNC))
2170 vp->var_func(var_end(s));
2172 if (!(vp->flags & (VTEXTFIXED|VSTACK)))
2173 free((char*)vp->var_text);
2175 flags |= vp->flags & ~(VTEXTFIXED|VSTACK|VNOSAVE|VUNSET);
2177 /* variable s is not found */
2180 vp = ckzalloc(sizeof(*vp));
2182 /*vp->func = NULL; - ckzalloc did it */
2185 if (!(flags & (VTEXTFIXED|VSTACK|VNOSAVE)))
2192 * Set the value of a variable. The flags argument is ored with the
2193 * flags of the variable. If val is NULL, the variable is unset.
2196 setvar(const char *name, const char *val, int flags)
2203 q = endofname(name);
2204 p = strchrnul(q, '=');
2206 if (!namelen || p != q)
2207 ash_msg_and_raise_error("%.*s: bad variable name", namelen, name);
2212 vallen = strlen(val);
2215 nameeq = ckmalloc(namelen + vallen + 2);
2216 p = (char *)memcpy(nameeq, name, namelen) + namelen;
2219 p = (char *)memcpy(p, val, vallen) + vallen;
2222 setvareq(nameeq, flags | VNOSAVE);
2226 static void FAST_FUNC
2227 setvar2(const char *name, const char *val)
2229 setvar(name, val, 0);
2232 #if ENABLE_ASH_GETOPTS
2234 * Safe version of setvar, returns 1 on success 0 on failure.
2237 setvarsafe(const char *name, const char *val, int flags)
2240 volatile int saveint;
2241 struct jmploc *volatile savehandler = exception_handler;
2242 struct jmploc jmploc;
2245 if (setjmp(jmploc.loc))
2248 exception_handler = &jmploc;
2249 setvar(name, val, flags);
2252 exception_handler = savehandler;
2253 RESTORE_INT(saveint);
2259 * Unset the specified variable.
2262 unsetvar(const char *s)
2268 vpp = findvar(hashvar(s), s);
2272 int flags = vp->flags;
2275 if (flags & VREADONLY)
2277 #if ENABLE_ASH_RANDOM_SUPPORT
2278 vp->flags &= ~VDYNAMIC;
2282 if ((flags & VSTRFIXED) == 0) {
2284 if ((flags & (VTEXTFIXED|VSTACK)) == 0)
2285 free((char*)vp->var_text);
2291 vp->flags &= ~VEXPORT;
2301 * Process a linked list of variable assignments.
2304 listsetvar(struct strlist *list_set_var, int flags)
2306 struct strlist *lp = list_set_var;
2312 setvareq(lp->text, flags);
2319 * Generate a list of variables satisfying the given conditions.
2322 listvars(int on, int off, char ***end)
2333 for (vp = *vpp; vp; vp = vp->next) {
2334 if ((vp->flags & mask) == on) {
2335 if (ep == stackstrend())
2336 ep = growstackstr();
2337 *ep++ = (char*)vp->var_text;
2340 } while (++vpp < vartab + VTABSIZE);
2341 if (ep == stackstrend())
2342 ep = growstackstr();
2346 return grabstackstr(ep);
2350 /* ============ Path search helper
2352 * The variable path (passed by reference) should be set to the start
2353 * of the path before the first call; path_advance will update
2354 * this value as it proceeds. Successive calls to path_advance will return
2355 * the possible path expansions in sequence. If an option (indicated by
2356 * a percent sign) appears in the path entry then the global variable
2357 * pathopt will be set to point to it; otherwise pathopt will be set to
2360 static const char *pathopt; /* set by path_advance */
2363 path_advance(const char **path, const char *name)
2373 for (p = start; *p && *p != ':' && *p != '%'; p++)
2375 len = p - start + strlen(name) + 2; /* "2" is for '/' and '\0' */
2376 while (stackblocksize() < len)
2380 memcpy(q, start, p - start);
2388 while (*p && *p != ':')
2395 return stalloc(len);
2399 /* ============ Prompt */
2401 static smallint doprompt; /* if set, prompt the user */
2402 static smallint needprompt; /* true if interactive and at start of line */
2404 #if ENABLE_FEATURE_EDITING
2405 static line_input_t *line_input_state;
2406 static const char *cmdedit_prompt;
2408 putprompt(const char *s)
2410 if (ENABLE_ASH_EXPAND_PRMT) {
2411 free((char*)cmdedit_prompt);
2412 cmdedit_prompt = ckstrdup(s);
2419 putprompt(const char *s)
2425 #if ENABLE_ASH_EXPAND_PRMT
2426 /* expandstr() needs parsing machinery, so it is far away ahead... */
2427 static const char *expandstr(const char *ps);
2429 #define expandstr(s) s
2433 setprompt(int whichprompt)
2436 #if ENABLE_ASH_EXPAND_PRMT
2437 struct stackmark smark;
2442 switch (whichprompt) {
2452 #if ENABLE_ASH_EXPAND_PRMT
2453 setstackmark(&smark);
2454 stalloc(stackblocksize());
2456 putprompt(expandstr(prompt));
2457 #if ENABLE_ASH_EXPAND_PRMT
2458 popstackmark(&smark);
2463 /* ============ The cd and pwd commands */
2465 #define CD_PHYSICAL 1
2475 while ((i = nextopt("LP")) != '\0') {
2477 flags ^= CD_PHYSICAL;
2486 * Update curdir (the name of the current directory) in response to a
2490 updatepwd(const char *dir)
2497 cdcomppath = ststrdup(dir);
2500 if (curdir == nullstr)
2502 new = stack_putstr(curdir, new);
2504 new = makestrspace(strlen(dir) + 2, new);
2505 lim = (char *)stackblock() + 1;
2509 if (new > lim && *lim == '/')
2514 if (dir[1] == '/' && dir[2] != '/') {
2520 p = strtok(cdcomppath, "/");
2524 if (p[1] == '.' && p[2] == '\0') {
2536 new = stack_putstr(p, new);
2544 return stackblock();
2548 * Find out what the current directory is. If we already know the current
2549 * directory, this routine returns immediately.
2554 char *dir = getcwd(NULL, 0); /* huh, using glibc extension? */
2555 return dir ? dir : nullstr;
2559 setpwd(const char *val, int setold)
2563 oldcur = dir = curdir;
2566 setvar("OLDPWD", oldcur, VEXPORT);
2569 if (physdir != nullstr) {
2570 if (physdir != oldcur)
2574 if (oldcur == val || !val) {
2580 dir = ckstrdup(val);
2581 if (oldcur != dir && oldcur != nullstr) {
2586 setvar("PWD", dir, VEXPORT);
2589 static void hashcd(void);
2592 * Actually do the chdir. We also call hashcd to let the routines in exec.c
2593 * know that the current directory has changed.
2596 docd(const char *dest, int flags)
2598 const char *dir = NULL;
2601 TRACE(("docd(\"%s\", %d) called\n", dest, flags));
2604 if (!(flags & CD_PHYSICAL)) {
2605 dir = updatepwd(dest);
2619 static int FAST_FUNC
2620 cdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
2632 dest = bltinlookup("HOME");
2633 else if (LONE_DASH(dest)) {
2634 dest = bltinlookup("OLDPWD");
2656 path = bltinlookup("CDPATH");
2665 p = path_advance(&path, dest);
2666 if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
2670 if (!docd(p, flags))
2675 ash_msg_and_raise_error("can't cd to %s", dest);
2678 if (flags & CD_PRINT)
2679 out1fmt("%s\n", curdir);
2683 static int FAST_FUNC
2684 pwdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
2687 const char *dir = curdir;
2691 if (physdir == nullstr)
2695 out1fmt("%s\n", dir);
2700 /* ============ ... */
2703 #define IBUFSIZ (ENABLE_FEATURE_EDITING ? CONFIG_FEATURE_EDITING_MAX_LEN : 1024)
2705 /* Syntax classes */
2706 #define CWORD 0 /* character is nothing special */
2707 #define CNL 1 /* newline character */
2708 #define CBACK 2 /* a backslash character */
2709 #define CSQUOTE 3 /* single quote */
2710 #define CDQUOTE 4 /* double quote */
2711 #define CENDQUOTE 5 /* a terminating quote */
2712 #define CBQUOTE 6 /* backwards single quote */
2713 #define CVAR 7 /* a dollar sign */
2714 #define CENDVAR 8 /* a '}' character */
2715 #define CLP 9 /* a left paren in arithmetic */
2716 #define CRP 10 /* a right paren in arithmetic */
2717 #define CENDFILE 11 /* end of file */
2718 #define CCTL 12 /* like CWORD, except it must be escaped */
2719 #define CSPCL 13 /* these terminate a word */
2720 #define CIGN 14 /* character should be ignored */
2723 #if ENABLE_ASH_ALIAS
2727 #define USE_SIT_FUNCTION ENABLE_ASH_OPTIMIZE_FOR_SIZE
2729 #if ENABLE_SH_MATH_SUPPORT
2730 # define SIT_ITEM(a,b,c,d) (a | (b << 4) | (c << 8) | (d << 12))
2732 # define SIT_ITEM(a,b,c,d) (a | (b << 4) | (c << 8))
2734 static const uint16_t S_I_T[] = {
2735 #if ENABLE_ASH_ALIAS
2736 SIT_ITEM(CSPCL , CIGN , CIGN , CIGN ), /* 0, PEOA */
2738 SIT_ITEM(CSPCL , CWORD , CWORD, CWORD ), /* 1, ' ' */
2739 SIT_ITEM(CNL , CNL , CNL , CNL ), /* 2, \n */
2740 SIT_ITEM(CWORD , CCTL , CCTL , CWORD ), /* 3, !*-/:=?[]~ */
2741 SIT_ITEM(CDQUOTE , CENDQUOTE, CWORD, CWORD ), /* 4, '"' */
2742 SIT_ITEM(CVAR , CVAR , CWORD, CVAR ), /* 5, $ */
2743 SIT_ITEM(CSQUOTE , CWORD , CENDQUOTE, CWORD), /* 6, "'" */
2744 SIT_ITEM(CSPCL , CWORD , CWORD, CLP ), /* 7, ( */
2745 SIT_ITEM(CSPCL , CWORD , CWORD, CRP ), /* 8, ) */
2746 SIT_ITEM(CBACK , CBACK , CCTL , CBACK ), /* 9, \ */
2747 SIT_ITEM(CBQUOTE , CBQUOTE , CWORD, CBQUOTE), /* 10, ` */
2748 SIT_ITEM(CENDVAR , CENDVAR , CWORD, CENDVAR), /* 11, } */
2749 #if !USE_SIT_FUNCTION
2750 SIT_ITEM(CENDFILE, CENDFILE , CENDFILE, CENDFILE),/* 12, PEOF */
2751 SIT_ITEM(CWORD , CWORD , CWORD, CWORD ), /* 13, 0-9A-Za-z */
2752 SIT_ITEM(CCTL , CCTL , CCTL , CCTL ) /* 14, CTLESC ... */
2756 /* Constants below must match table above */
2758 #if ENABLE_ASH_ALIAS
2759 CSPCL_CIGN_CIGN_CIGN , /* 0 */
2761 CSPCL_CWORD_CWORD_CWORD , /* 1 */
2762 CNL_CNL_CNL_CNL , /* 2 */
2763 CWORD_CCTL_CCTL_CWORD , /* 3 */
2764 CDQUOTE_CENDQUOTE_CWORD_CWORD , /* 4 */
2765 CVAR_CVAR_CWORD_CVAR , /* 5 */
2766 CSQUOTE_CWORD_CENDQUOTE_CWORD , /* 6 */
2767 CSPCL_CWORD_CWORD_CLP , /* 7 */
2768 CSPCL_CWORD_CWORD_CRP , /* 8 */
2769 CBACK_CBACK_CCTL_CBACK , /* 9 */
2770 CBQUOTE_CBQUOTE_CWORD_CBQUOTE , /* 10 */
2771 CENDVAR_CENDVAR_CWORD_CENDVAR , /* 11 */
2772 CENDFILE_CENDFILE_CENDFILE_CENDFILE, /* 12 */
2773 CWORD_CWORD_CWORD_CWORD , /* 13 */
2774 CCTL_CCTL_CCTL_CCTL , /* 14 */
2777 /* c in SIT(c, syntax) must be an *unsigned char* or PEOA or PEOF,
2778 * caller must ensure proper cast on it if c is *char_ptr!
2780 /* Values for syntax param */
2781 #define BASESYNTAX 0 /* not in quotes */
2782 #define DQSYNTAX 1 /* in double quotes */
2783 #define SQSYNTAX 2 /* in single quotes */
2784 #define ARISYNTAX 3 /* in arithmetic */
2785 #define PSSYNTAX 4 /* prompt. never passed to SIT() */
2787 #if USE_SIT_FUNCTION
2790 SIT(int c, int syntax)
2792 static const char spec_symbls[] ALIGN1 = "\t\n !\"$&'()*-/:;<=>?[\\]`|}~";
2793 # if ENABLE_ASH_ALIAS
2794 static const uint8_t syntax_index_table[] ALIGN1 = {
2795 1, 2, 1, 3, 4, 5, 1, 6, /* "\t\n !\"$&'" */
2796 7, 8, 3, 3, 3, 3, 1, 1, /* "()*-/:;<" */
2797 3, 1, 3, 3, 9, 3, 10, 1, /* "=>?[\\]`|" */
2801 static const uint8_t syntax_index_table[] ALIGN1 = {
2802 0, 1, 0, 2, 3, 4, 0, 5, /* "\t\n !\"$&'" */
2803 6, 7, 2, 2, 2, 2, 0, 0, /* "()*-/:;<" */
2804 2, 0, 2, 2, 8, 2, 9, 0, /* "=>?[\\]`|" */
2813 # if ENABLE_ASH_ALIAS
2819 /* Cast is purely for paranoia here,
2820 * just in case someone passed signed char to us */
2821 if ((unsigned char)c >= CTL_FIRST
2822 && (unsigned char)c <= CTL_LAST
2826 s = strchrnul(spec_symbls, c);
2829 indx = syntax_index_table[s - spec_symbls];
2831 return (S_I_T[indx] >> (syntax*4)) & 0xf;
2834 #else /* !USE_SIT_FUNCTION */
2836 static const uint8_t syntax_index_table[] = {
2837 /* BASESYNTAX_DQSYNTAX_SQSYNTAX_ARISYNTAX */
2838 /* 0 */ CWORD_CWORD_CWORD_CWORD,
2839 /* 1 */ CWORD_CWORD_CWORD_CWORD,
2840 /* 2 */ CWORD_CWORD_CWORD_CWORD,
2841 /* 3 */ CWORD_CWORD_CWORD_CWORD,
2842 /* 4 */ CWORD_CWORD_CWORD_CWORD,
2843 /* 5 */ CWORD_CWORD_CWORD_CWORD,
2844 /* 6 */ CWORD_CWORD_CWORD_CWORD,
2845 /* 7 */ CWORD_CWORD_CWORD_CWORD,
2846 /* 8 */ CWORD_CWORD_CWORD_CWORD,
2847 /* 9 "\t" */ CSPCL_CWORD_CWORD_CWORD,
2848 /* 10 "\n" */ CNL_CNL_CNL_CNL,
2849 /* 11 */ CWORD_CWORD_CWORD_CWORD,
2850 /* 12 */ CWORD_CWORD_CWORD_CWORD,
2851 /* 13 */ CWORD_CWORD_CWORD_CWORD,
2852 /* 14 */ CWORD_CWORD_CWORD_CWORD,
2853 /* 15 */ CWORD_CWORD_CWORD_CWORD,
2854 /* 16 */ CWORD_CWORD_CWORD_CWORD,
2855 /* 17 */ CWORD_CWORD_CWORD_CWORD,
2856 /* 18 */ CWORD_CWORD_CWORD_CWORD,
2857 /* 19 */ CWORD_CWORD_CWORD_CWORD,
2858 /* 20 */ CWORD_CWORD_CWORD_CWORD,
2859 /* 21 */ CWORD_CWORD_CWORD_CWORD,
2860 /* 22 */ CWORD_CWORD_CWORD_CWORD,
2861 /* 23 */ CWORD_CWORD_CWORD_CWORD,
2862 /* 24 */ CWORD_CWORD_CWORD_CWORD,
2863 /* 25 */ CWORD_CWORD_CWORD_CWORD,
2864 /* 26 */ CWORD_CWORD_CWORD_CWORD,
2865 /* 27 */ CWORD_CWORD_CWORD_CWORD,
2866 /* 28 */ CWORD_CWORD_CWORD_CWORD,
2867 /* 29 */ CWORD_CWORD_CWORD_CWORD,
2868 /* 30 */ CWORD_CWORD_CWORD_CWORD,
2869 /* 31 */ CWORD_CWORD_CWORD_CWORD,
2870 /* 32 " " */ CSPCL_CWORD_CWORD_CWORD,
2871 /* 33 "!" */ CWORD_CCTL_CCTL_CWORD,
2872 /* 34 """ */ CDQUOTE_CENDQUOTE_CWORD_CWORD,
2873 /* 35 "#" */ CWORD_CWORD_CWORD_CWORD,
2874 /* 36 "$" */ CVAR_CVAR_CWORD_CVAR,
2875 /* 37 "%" */ CWORD_CWORD_CWORD_CWORD,
2876 /* 38 "&" */ CSPCL_CWORD_CWORD_CWORD,
2877 /* 39 "'" */ CSQUOTE_CWORD_CENDQUOTE_CWORD,
2878 /* 40 "(" */ CSPCL_CWORD_CWORD_CLP,
2879 /* 41 ")" */ CSPCL_CWORD_CWORD_CRP,
2880 /* 42 "*" */ CWORD_CCTL_CCTL_CWORD,
2881 /* 43 "+" */ CWORD_CWORD_CWORD_CWORD,
2882 /* 44 "," */ CWORD_CWORD_CWORD_CWORD,
2883 /* 45 "-" */ CWORD_CCTL_CCTL_CWORD,
2884 /* 46 "." */ CWORD_CWORD_CWORD_CWORD,
2885 /* 47 "/" */ CWORD_CCTL_CCTL_CWORD,
2886 /* 48 "0" */ CWORD_CWORD_CWORD_CWORD,
2887 /* 49 "1" */ CWORD_CWORD_CWORD_CWORD,
2888 /* 50 "2" */ CWORD_CWORD_CWORD_CWORD,
2889 /* 51 "3" */ CWORD_CWORD_CWORD_CWORD,
2890 /* 52 "4" */ CWORD_CWORD_CWORD_CWORD,
2891 /* 53 "5" */ CWORD_CWORD_CWORD_CWORD,
2892 /* 54 "6" */ CWORD_CWORD_CWORD_CWORD,
2893 /* 55 "7" */ CWORD_CWORD_CWORD_CWORD,
2894 /* 56 "8" */ CWORD_CWORD_CWORD_CWORD,
2895 /* 57 "9" */ CWORD_CWORD_CWORD_CWORD,
2896 /* 58 ":" */ CWORD_CCTL_CCTL_CWORD,
2897 /* 59 ";" */ CSPCL_CWORD_CWORD_CWORD,
2898 /* 60 "<" */ CSPCL_CWORD_CWORD_CWORD,
2899 /* 61 "=" */ CWORD_CCTL_CCTL_CWORD,
2900 /* 62 ">" */ CSPCL_CWORD_CWORD_CWORD,
2901 /* 63 "?" */ CWORD_CCTL_CCTL_CWORD,
2902 /* 64 "@" */ CWORD_CWORD_CWORD_CWORD,
2903 /* 65 "A" */ CWORD_CWORD_CWORD_CWORD,
2904 /* 66 "B" */ CWORD_CWORD_CWORD_CWORD,
2905 /* 67 "C" */ CWORD_CWORD_CWORD_CWORD,
2906 /* 68 "D" */ CWORD_CWORD_CWORD_CWORD,
2907 /* 69 "E" */ CWORD_CWORD_CWORD_CWORD,
2908 /* 70 "F" */ CWORD_CWORD_CWORD_CWORD,
2909 /* 71 "G" */ CWORD_CWORD_CWORD_CWORD,
2910 /* 72 "H" */ CWORD_CWORD_CWORD_CWORD,
2911 /* 73 "I" */ CWORD_CWORD_CWORD_CWORD,
2912 /* 74 "J" */ CWORD_CWORD_CWORD_CWORD,
2913 /* 75 "K" */ CWORD_CWORD_CWORD_CWORD,
2914 /* 76 "L" */ CWORD_CWORD_CWORD_CWORD,
2915 /* 77 "M" */ CWORD_CWORD_CWORD_CWORD,
2916 /* 78 "N" */ CWORD_CWORD_CWORD_CWORD,
2917 /* 79 "O" */ CWORD_CWORD_CWORD_CWORD,
2918 /* 80 "P" */ CWORD_CWORD_CWORD_CWORD,
2919 /* 81 "Q" */ CWORD_CWORD_CWORD_CWORD,
2920 /* 82 "R" */ CWORD_CWORD_CWORD_CWORD,
2921 /* 83 "S" */ CWORD_CWORD_CWORD_CWORD,
2922 /* 84 "T" */ CWORD_CWORD_CWORD_CWORD,
2923 /* 85 "U" */ CWORD_CWORD_CWORD_CWORD,
2924 /* 86 "V" */ CWORD_CWORD_CWORD_CWORD,
2925 /* 87 "W" */ CWORD_CWORD_CWORD_CWORD,
2926 /* 88 "X" */ CWORD_CWORD_CWORD_CWORD,
2927 /* 89 "Y" */ CWORD_CWORD_CWORD_CWORD,
2928 /* 90 "Z" */ CWORD_CWORD_CWORD_CWORD,
2929 /* 91 "[" */ CWORD_CCTL_CCTL_CWORD,
2930 /* 92 "\" */ CBACK_CBACK_CCTL_CBACK,
2931 /* 93 "]" */ CWORD_CCTL_CCTL_CWORD,
2932 /* 94 "^" */ CWORD_CWORD_CWORD_CWORD,
2933 /* 95 "_" */ CWORD_CWORD_CWORD_CWORD,
2934 /* 96 "`" */ CBQUOTE_CBQUOTE_CWORD_CBQUOTE,
2935 /* 97 "a" */ CWORD_CWORD_CWORD_CWORD,
2936 /* 98 "b" */ CWORD_CWORD_CWORD_CWORD,
2937 /* 99 "c" */ CWORD_CWORD_CWORD_CWORD,
2938 /* 100 "d" */ CWORD_CWORD_CWORD_CWORD,
2939 /* 101 "e" */ CWORD_CWORD_CWORD_CWORD,
2940 /* 102 "f" */ CWORD_CWORD_CWORD_CWORD,
2941 /* 103 "g" */ CWORD_CWORD_CWORD_CWORD,
2942 /* 104 "h" */ CWORD_CWORD_CWORD_CWORD,
2943 /* 105 "i" */ CWORD_CWORD_CWORD_CWORD,
2944 /* 106 "j" */ CWORD_CWORD_CWORD_CWORD,
2945 /* 107 "k" */ CWORD_CWORD_CWORD_CWORD,
2946 /* 108 "l" */ CWORD_CWORD_CWORD_CWORD,
2947 /* 109 "m" */ CWORD_CWORD_CWORD_CWORD,
2948 /* 110 "n" */ CWORD_CWORD_CWORD_CWORD,
2949 /* 111 "o" */ CWORD_CWORD_CWORD_CWORD,
2950 /* 112 "p" */ CWORD_CWORD_CWORD_CWORD,
2951 /* 113 "q" */ CWORD_CWORD_CWORD_CWORD,
2952 /* 114 "r" */ CWORD_CWORD_CWORD_CWORD,
2953 /* 115 "s" */ CWORD_CWORD_CWORD_CWORD,
2954 /* 116 "t" */ CWORD_CWORD_CWORD_CWORD,
2955 /* 117 "u" */ CWORD_CWORD_CWORD_CWORD,
2956 /* 118 "v" */ CWORD_CWORD_CWORD_CWORD,
2957 /* 119 "w" */ CWORD_CWORD_CWORD_CWORD,
2958 /* 120 "x" */ CWORD_CWORD_CWORD_CWORD,
2959 /* 121 "y" */ CWORD_CWORD_CWORD_CWORD,
2960 /* 122 "z" */ CWORD_CWORD_CWORD_CWORD,
2961 /* 123 "{" */ CWORD_CWORD_CWORD_CWORD,
2962 /* 124 "|" */ CSPCL_CWORD_CWORD_CWORD,
2963 /* 125 "}" */ CENDVAR_CENDVAR_CWORD_CENDVAR,
2964 /* 126 "~" */ CWORD_CCTL_CCTL_CWORD,
2965 /* 127 del */ CWORD_CWORD_CWORD_CWORD,
2966 /* 128 0x80 */ CWORD_CWORD_CWORD_CWORD,
2967 /* 129 CTLESC */ CCTL_CCTL_CCTL_CCTL,
2968 /* 130 CTLVAR */ CCTL_CCTL_CCTL_CCTL,
2969 /* 131 CTLENDVAR */ CCTL_CCTL_CCTL_CCTL,
2970 /* 132 CTLBACKQ */ CCTL_CCTL_CCTL_CCTL,
2971 /* 133 CTLQUOTE */ CCTL_CCTL_CCTL_CCTL,
2972 /* 134 CTLARI */ CCTL_CCTL_CCTL_CCTL,
2973 /* 135 CTLENDARI */ CCTL_CCTL_CCTL_CCTL,
2974 /* 136 CTLQUOTEMARK */ CCTL_CCTL_CCTL_CCTL,
2975 /* 137 */ CWORD_CWORD_CWORD_CWORD,
2976 /* 138 */ CWORD_CWORD_CWORD_CWORD,
2977 /* 139 */ CWORD_CWORD_CWORD_CWORD,
2978 /* 140 */ CWORD_CWORD_CWORD_CWORD,
2979 /* 141 */ CWORD_CWORD_CWORD_CWORD,
2980 /* 142 */ CWORD_CWORD_CWORD_CWORD,
2981 /* 143 */ CWORD_CWORD_CWORD_CWORD,
2982 /* 144 */ CWORD_CWORD_CWORD_CWORD,
2983 /* 145 */ CWORD_CWORD_CWORD_CWORD,
2984 /* 146 */ CWORD_CWORD_CWORD_CWORD,
2985 /* 147 */ CWORD_CWORD_CWORD_CWORD,
2986 /* 148 */ CWORD_CWORD_CWORD_CWORD,
2987 /* 149 */ CWORD_CWORD_CWORD_CWORD,
2988 /* 150 */ CWORD_CWORD_CWORD_CWORD,
2989 /* 151 */ CWORD_CWORD_CWORD_CWORD,
2990 /* 152 */ CWORD_CWORD_CWORD_CWORD,
2991 /* 153 */ CWORD_CWORD_CWORD_CWORD,
2992 /* 154 */ CWORD_CWORD_CWORD_CWORD,
2993 /* 155 */ CWORD_CWORD_CWORD_CWORD,
2994 /* 156 */ CWORD_CWORD_CWORD_CWORD,
2995 /* 157 */ CWORD_CWORD_CWORD_CWORD,
2996 /* 158 */ CWORD_CWORD_CWORD_CWORD,
2997 /* 159 */ CWORD_CWORD_CWORD_CWORD,
2998 /* 160 */ CWORD_CWORD_CWORD_CWORD,
2999 /* 161 */ CWORD_CWORD_CWORD_CWORD,
3000 /* 162 */ CWORD_CWORD_CWORD_CWORD,
3001 /* 163 */ CWORD_CWORD_CWORD_CWORD,
3002 /* 164 */ CWORD_CWORD_CWORD_CWORD,
3003 /* 165 */ CWORD_CWORD_CWORD_CWORD,
3004 /* 166 */ CWORD_CWORD_CWORD_CWORD,
3005 /* 167 */ CWORD_CWORD_CWORD_CWORD,
3006 /* 168 */ CWORD_CWORD_CWORD_CWORD,
3007 /* 169 */ CWORD_CWORD_CWORD_CWORD,
3008 /* 170 */ CWORD_CWORD_CWORD_CWORD,
3009 /* 171 */ CWORD_CWORD_CWORD_CWORD,
3010 /* 172 */ CWORD_CWORD_CWORD_CWORD,
3011 /* 173 */ CWORD_CWORD_CWORD_CWORD,
3012 /* 174 */ CWORD_CWORD_CWORD_CWORD,
3013 /* 175 */ CWORD_CWORD_CWORD_CWORD,
3014 /* 176 */ CWORD_CWORD_CWORD_CWORD,
3015 /* 177 */ CWORD_CWORD_CWORD_CWORD,
3016 /* 178 */ CWORD_CWORD_CWORD_CWORD,
3017 /* 179 */ CWORD_CWORD_CWORD_CWORD,
3018 /* 180 */ CWORD_CWORD_CWORD_CWORD,
3019 /* 181 */ CWORD_CWORD_CWORD_CWORD,
3020 /* 182 */ CWORD_CWORD_CWORD_CWORD,
3021 /* 183 */ CWORD_CWORD_CWORD_CWORD,
3022 /* 184 */ CWORD_CWORD_CWORD_CWORD,
3023 /* 185 */ CWORD_CWORD_CWORD_CWORD,
3024 /* 186 */ CWORD_CWORD_CWORD_CWORD,
3025 /* 187 */ CWORD_CWORD_CWORD_CWORD,
3026 /* 188 */ CWORD_CWORD_CWORD_CWORD,
3027 /* 189 */ CWORD_CWORD_CWORD_CWORD,
3028 /* 190 */ CWORD_CWORD_CWORD_CWORD,
3029 /* 191 */ CWORD_CWORD_CWORD_CWORD,
3030 /* 192 */ CWORD_CWORD_CWORD_CWORD,
3031 /* 193 */ CWORD_CWORD_CWORD_CWORD,
3032 /* 194 */ CWORD_CWORD_CWORD_CWORD,
3033 /* 195 */ CWORD_CWORD_CWORD_CWORD,
3034 /* 196 */ CWORD_CWORD_CWORD_CWORD,
3035 /* 197 */ CWORD_CWORD_CWORD_CWORD,
3036 /* 198 */ CWORD_CWORD_CWORD_CWORD,
3037 /* 199 */ CWORD_CWORD_CWORD_CWORD,
3038 /* 200 */ CWORD_CWORD_CWORD_CWORD,
3039 /* 201 */ CWORD_CWORD_CWORD_CWORD,
3040 /* 202 */ CWORD_CWORD_CWORD_CWORD,
3041 /* 203 */ CWORD_CWORD_CWORD_CWORD,
3042 /* 204 */ CWORD_CWORD_CWORD_CWORD,
3043 /* 205 */ CWORD_CWORD_CWORD_CWORD,
3044 /* 206 */ CWORD_CWORD_CWORD_CWORD,
3045 /* 207 */ CWORD_CWORD_CWORD_CWORD,
3046 /* 208 */ CWORD_CWORD_CWORD_CWORD,
3047 /* 209 */ CWORD_CWORD_CWORD_CWORD,
3048 /* 210 */ CWORD_CWORD_CWORD_CWORD,
3049 /* 211 */ CWORD_CWORD_CWORD_CWORD,
3050 /* 212 */ CWORD_CWORD_CWORD_CWORD,
3051 /* 213 */ CWORD_CWORD_CWORD_CWORD,
3052 /* 214 */ CWORD_CWORD_CWORD_CWORD,
3053 /* 215 */ CWORD_CWORD_CWORD_CWORD,
3054 /* 216 */ CWORD_CWORD_CWORD_CWORD,
3055 /* 217 */ CWORD_CWORD_CWORD_CWORD,
3056 /* 218 */ CWORD_CWORD_CWORD_CWORD,
3057 /* 219 */ CWORD_CWORD_CWORD_CWORD,
3058 /* 220 */ CWORD_CWORD_CWORD_CWORD,
3059 /* 221 */ CWORD_CWORD_CWORD_CWORD,
3060 /* 222 */ CWORD_CWORD_CWORD_CWORD,
3061 /* 223 */ CWORD_CWORD_CWORD_CWORD,
3062 /* 224 */ CWORD_CWORD_CWORD_CWORD,
3063 /* 225 */ CWORD_CWORD_CWORD_CWORD,
3064 /* 226 */ CWORD_CWORD_CWORD_CWORD,
3065 /* 227 */ CWORD_CWORD_CWORD_CWORD,
3066 /* 228 */ CWORD_CWORD_CWORD_CWORD,
3067 /* 229 */ CWORD_CWORD_CWORD_CWORD,
3068 /* 230 */ CWORD_CWORD_CWORD_CWORD,
3069 /* 231 */ CWORD_CWORD_CWORD_CWORD,
3070 /* 232 */ CWORD_CWORD_CWORD_CWORD,
3071 /* 233 */ CWORD_CWORD_CWORD_CWORD,
3072 /* 234 */ CWORD_CWORD_CWORD_CWORD,
3073 /* 235 */ CWORD_CWORD_CWORD_CWORD,
3074 /* 236 */ CWORD_CWORD_CWORD_CWORD,
3075 /* 237 */ CWORD_CWORD_CWORD_CWORD,
3076 /* 238 */ CWORD_CWORD_CWORD_CWORD,
3077 /* 239 */ CWORD_CWORD_CWORD_CWORD,
3078 /* 230 */ CWORD_CWORD_CWORD_CWORD,
3079 /* 241 */ CWORD_CWORD_CWORD_CWORD,
3080 /* 242 */ CWORD_CWORD_CWORD_CWORD,
3081 /* 243 */ CWORD_CWORD_CWORD_CWORD,
3082 /* 244 */ CWORD_CWORD_CWORD_CWORD,
3083 /* 245 */ CWORD_CWORD_CWORD_CWORD,
3084 /* 246 */ CWORD_CWORD_CWORD_CWORD,
3085 /* 247 */ CWORD_CWORD_CWORD_CWORD,
3086 /* 248 */ CWORD_CWORD_CWORD_CWORD,
3087 /* 249 */ CWORD_CWORD_CWORD_CWORD,
3088 /* 250 */ CWORD_CWORD_CWORD_CWORD,
3089 /* 251 */ CWORD_CWORD_CWORD_CWORD,
3090 /* 252 */ CWORD_CWORD_CWORD_CWORD,
3091 /* 253 */ CWORD_CWORD_CWORD_CWORD,
3092 /* 254 */ CWORD_CWORD_CWORD_CWORD,
3093 /* 255 */ CWORD_CWORD_CWORD_CWORD,
3094 /* PEOF */ CENDFILE_CENDFILE_CENDFILE_CENDFILE,
3095 # if ENABLE_ASH_ALIAS
3096 /* PEOA */ CSPCL_CIGN_CIGN_CIGN,
3100 # define SIT(c, syntax) ((S_I_T[syntax_index_table[c]] >> ((syntax)*4)) & 0xf)
3102 #endif /* !USE_SIT_FUNCTION */
3105 /* ============ Alias handling */
3107 #if ENABLE_ASH_ALIAS
3109 #define ALIASINUSE 1
3120 static struct alias **atab; // [ATABSIZE];
3121 #define INIT_G_alias() do { \
3122 atab = xzalloc(ATABSIZE * sizeof(atab[0])); \
3126 static struct alias **
3127 __lookupalias(const char *name) {
3128 unsigned int hashval;
3135 ch = (unsigned char)*p;
3139 ch = (unsigned char)*++p;
3141 app = &atab[hashval % ATABSIZE];
3143 for (; *app; app = &(*app)->next) {
3144 if (strcmp(name, (*app)->name) == 0) {
3152 static struct alias *
3153 lookupalias(const char *name, int check)
3155 struct alias *ap = *__lookupalias(name);
3157 if (check && ap && (ap->flag & ALIASINUSE))
3162 static struct alias *
3163 freealias(struct alias *ap)
3167 if (ap->flag & ALIASINUSE) {
3168 ap->flag |= ALIASDEAD;
3180 setalias(const char *name, const char *val)
3182 struct alias *ap, **app;
3184 app = __lookupalias(name);
3188 if (!(ap->flag & ALIASINUSE)) {
3191 ap->val = ckstrdup(val);
3192 ap->flag &= ~ALIASDEAD;
3195 ap = ckzalloc(sizeof(struct alias));
3196 ap->name = ckstrdup(name);
3197 ap->val = ckstrdup(val);
3198 /*ap->flag = 0; - ckzalloc did it */
3199 /*ap->next = NULL;*/
3206 unalias(const char *name)
3210 app = __lookupalias(name);
3214 *app = freealias(*app);
3225 struct alias *ap, **app;
3229 for (i = 0; i < ATABSIZE; i++) {
3231 for (ap = *app; ap; ap = *app) {
3232 *app = freealias(*app);
3242 printalias(const struct alias *ap)
3244 out1fmt("%s=%s\n", ap->name, single_quote(ap->val));
3248 * TODO - sort output
3250 static int FAST_FUNC
3251 aliascmd(int argc UNUSED_PARAM, char **argv)
3260 for (i = 0; i < ATABSIZE; i++) {
3261 for (ap = atab[i]; ap; ap = ap->next) {
3267 while ((n = *++argv) != NULL) {
3268 v = strchr(n+1, '=');
3269 if (v == NULL) { /* n+1: funny ksh stuff */
3270 ap = *__lookupalias(n);
3272 fprintf(stderr, "%s: %s not found\n", "alias", n);
3285 static int FAST_FUNC
3286 unaliascmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
3290 while ((i = nextopt("a")) != '\0') {
3296 for (i = 0; *argptr; argptr++) {
3297 if (unalias(*argptr)) {
3298 fprintf(stderr, "%s: %s not found\n", "unalias", *argptr);
3306 #endif /* ASH_ALIAS */
3309 /* ============ jobs.c */
3311 /* Mode argument to forkshell. Don't change FORK_FG or FORK_BG. */
3314 #define FORK_NOJOB 2
3316 /* mode flags for showjob(s) */
3317 #define SHOW_ONLY_PGID 0x01 /* show only pgid (jobs -p) */
3318 #define SHOW_PIDS 0x02 /* show individual pids, not just one line per job */
3319 #define SHOW_CHANGED 0x04 /* only jobs whose state has changed */
3322 * A job structure contains information about a job. A job is either a
3323 * single process or a set of processes contained in a pipeline. In the
3324 * latter case, pidlist will be non-NULL, and will point to a -1 terminated
3328 pid_t ps_pid; /* process id */
3329 int ps_status; /* last process status from wait() */
3330 char *ps_cmd; /* text of command being run */
3334 struct procstat ps0; /* status of process */
3335 struct procstat *ps; /* status or processes when more than one */
3337 int stopstatus; /* status of a stopped job */
3340 nprocs: 16, /* number of processes */
3342 #define JOBRUNNING 0 /* at least one proc running */
3343 #define JOBSTOPPED 1 /* all procs are stopped */
3344 #define JOBDONE 2 /* all procs are completed */
3346 sigint: 1, /* job was killed by SIGINT */
3347 jobctl: 1, /* job running under job control */
3349 waited: 1, /* true if this entry has been waited for */
3350 used: 1, /* true if this entry is in used */
3351 changed: 1; /* true if status has changed */
3352 struct job *prev_job; /* previous job */
3355 static struct job *makejob(/*union node *,*/ int);
3356 static int forkshell(struct job *, union node *, int);
3357 static int waitforjob(struct job *);
3360 enum { doing_jobctl = 0 };
3361 #define setjobctl(on) do {} while (0)
3363 static smallint doing_jobctl; //references:8
3364 static void setjobctl(int);
3371 ignoresig(int signo)
3373 /* Avoid unnecessary system calls. Is it already SIG_IGNed? */
3374 if (sigmode[signo - 1] != S_IGN && sigmode[signo - 1] != S_HARD_IGN) {
3375 /* No, need to do it */
3376 signal(signo, SIG_IGN);
3378 sigmode[signo - 1] = S_HARD_IGN;
3382 * Only one usage site - in setsignal()
3385 signal_handler(int signo)
3387 gotsig[signo - 1] = 1;
3389 if (signo == SIGINT && !trap[SIGINT]) {
3390 if (!suppress_int) {
3392 raise_interrupt(); /* does not return */
3396 pending_sig = signo;
3401 * Set the signal handler for the specified signal. The routine figures
3402 * out what it should be set to.
3405 setsignal(int signo)
3408 char cur_act, new_act;
3409 struct sigaction act;
3413 if (t != NULL) { /* trap for this sig is set */
3415 if (t[0] == '\0') /* trap is "": ignore this sig */
3419 if (rootshell && new_act == S_DFL) {
3422 if (iflag || minusc || sflag == 0)
3431 * "In all cases, bash ignores SIGQUIT. Non-builtin
3432 * commands run by bash have signal handlers
3433 * set to the values inherited by the shell
3434 * from its parent". */
3450 //TODO: if !rootshell, we reset SIGQUIT to DFL,
3451 //whereas we have to restore it to what shell got on entry
3452 //from the parent. See comment above
3454 t = &sigmode[signo - 1];
3457 /* current setting is not yet known */
3458 if (sigaction(signo, NULL, &act)) {
3459 /* pretend it worked; maybe we should give a warning,
3460 * but other shells don't. We don't alter sigmode,
3461 * so we retry every time.
3462 * btw, in Linux it never fails. --vda */
3465 if (act.sa_handler == SIG_IGN) {
3466 cur_act = S_HARD_IGN;
3468 && (signo == SIGTSTP || signo == SIGTTIN || signo == SIGTTOU)
3470 cur_act = S_IGN; /* don't hard ignore these */
3474 if (cur_act == S_HARD_IGN || cur_act == new_act)
3477 act.sa_handler = SIG_DFL;
3480 act.sa_handler = signal_handler;
3481 act.sa_flags = 0; /* matters only if !DFL and !IGN */
3482 sigfillset(&act.sa_mask); /* ditto */
3485 act.sa_handler = SIG_IGN;
3488 sigaction_set(signo, &act);
3493 /* mode flags for set_curjob */
3494 #define CUR_DELETE 2
3495 #define CUR_RUNNING 1
3496 #define CUR_STOPPED 0
3498 /* mode flags for dowait */
3499 #define DOWAIT_NONBLOCK WNOHANG
3500 #define DOWAIT_BLOCK 0
3503 /* pgrp of shell on invocation */
3504 static int initialpgrp; //references:2
3505 static int ttyfd = -1; //5
3508 static struct job *jobtab; //5
3510 static unsigned njobs; //4
3512 static struct job *curjob; //lots
3513 /* number of presumed living untracked jobs */
3514 static int jobless; //4
3517 set_curjob(struct job *jp, unsigned mode)
3520 struct job **jpp, **curp;
3522 /* first remove from list */
3523 jpp = curp = &curjob;
3528 jpp = &jp1->prev_job;
3530 *jpp = jp1->prev_job;
3532 /* Then re-insert in correct position */
3540 /* job being deleted */
3543 /* newly created job or backgrounded job,
3544 put after all stopped jobs. */
3548 if (!jp1 || jp1->state != JOBSTOPPED)
3551 jpp = &jp1->prev_job;
3557 /* newly stopped job - becomes curjob */
3558 jp->prev_job = *jpp;
3566 jobno(const struct job *jp)
3568 return jp - jobtab + 1;
3573 * Convert a job name to a job structure.
3576 #define getjob(name, getctl) getjob(name)
3579 getjob(const char *name, int getctl)
3583 const char *err_msg = "%s: no such job";
3587 char *(*match)(const char *, const char *);
3602 if (c == '+' || c == '%') {
3604 err_msg = "No current job";
3610 err_msg = "No previous job";
3621 jp = jobtab + num - 1;
3636 if (match(jp->ps[0].ps_cmd, p)) {
3640 err_msg = "%s: ambiguous";
3650 err_msg = "job %s not created under job control";
3651 if (getctl && jp->jobctl == 0)
3656 ash_msg_and_raise_error(err_msg, name);
3660 * Mark a job structure as unused.
3663 freejob(struct job *jp)
3665 struct procstat *ps;
3669 for (i = jp->nprocs, ps = jp->ps; --i >= 0; ps++) {
3670 if (ps->ps_cmd != nullstr)
3673 if (jp->ps != &jp->ps0)
3676 set_curjob(jp, CUR_DELETE);
3682 xtcsetpgrp(int fd, pid_t pgrp)
3684 if (tcsetpgrp(fd, pgrp))
3685 ash_msg_and_raise_error("can't set tty process group (%m)");
3689 * Turn job control on and off.
3691 * Note: This code assumes that the third arg to ioctl is a character
3692 * pointer, which is true on Berkeley systems but not System V. Since
3693 * System V doesn't have job control yet, this isn't a problem now.
3695 * Called with interrupts off.
3703 if (on == doing_jobctl || rootshell == 0)
3707 ofd = fd = open(_PATH_TTY, O_RDWR);
3709 /* BTW, bash will try to open(ttyname(0)) if open("/dev/tty") fails.
3710 * That sometimes helps to acquire controlling tty.
3711 * Obviously, a workaround for bugs when someone
3712 * failed to provide a controlling tty to bash! :) */
3718 fd = fcntl(fd, F_DUPFD, 10);
3723 /* fd is a tty at this point */
3724 close_on_exec_on(fd);
3725 do { /* while we are in the background */
3726 pgrp = tcgetpgrp(fd);
3729 ash_msg("can't access tty; job control turned off");
3733 if (pgrp == getpgrp())
3744 xtcsetpgrp(fd, pgrp);
3746 /* turning job control off */
3749 /* was xtcsetpgrp, but this can make exiting ash
3750 * loop forever if pty is already deleted */
3751 tcsetpgrp(fd, pgrp);
3765 static int FAST_FUNC
3766 killcmd(int argc, char **argv)
3769 if (argv[1] && strcmp(argv[1], "-l") != 0) {
3771 if (argv[i][0] == '%') {
3772 struct job *jp = getjob(argv[i], 0);
3773 unsigned pid = jp->ps[0].ps_pid;
3774 /* Enough space for ' -NNN<nul>' */
3775 argv[i] = alloca(sizeof(int)*3 + 3);
3776 /* kill_main has matching code to expect
3777 * leading space. Needed to not confuse
3778 * negative pids with "kill -SIGNAL_NO" syntax */
3779 sprintf(argv[i], " -%u", pid);
3781 } while (argv[++i]);
3783 return kill_main(argc, argv);
3787 showpipe(struct job *jp /*, FILE *out*/)
3789 struct procstat *ps;
3790 struct procstat *psend;
3792 psend = jp->ps + jp->nprocs;
3793 for (ps = jp->ps + 1; ps < psend; ps++)
3794 printf(" | %s", ps->ps_cmd);
3795 outcslow('\n', stdout);
3796 flush_stdout_stderr();
3801 restartjob(struct job *jp, int mode)
3803 struct procstat *ps;
3809 if (jp->state == JOBDONE)
3811 jp->state = JOBRUNNING;
3812 pgid = jp->ps[0].ps_pid;
3813 if (mode == FORK_FG)
3814 xtcsetpgrp(ttyfd, pgid);
3815 killpg(pgid, SIGCONT);
3819 if (WIFSTOPPED(ps->ps_status)) {
3825 status = (mode == FORK_FG) ? waitforjob(jp) : 0;
3830 static int FAST_FUNC
3831 fg_bgcmd(int argc UNUSED_PARAM, char **argv)
3837 mode = (**argv == 'f') ? FORK_FG : FORK_BG;
3841 jp = getjob(*argv, 1);
3842 if (mode == FORK_BG) {
3843 set_curjob(jp, CUR_RUNNING);
3844 printf("[%d] ", jobno(jp));
3846 out1str(jp->ps[0].ps_cmd);
3847 showpipe(jp /*, stdout*/);
3848 retval = restartjob(jp, mode);
3849 } while (*argv && *++argv);
3855 sprint_status(char *s, int status, int sigonly)
3861 if (!WIFEXITED(status)) {
3863 if (WIFSTOPPED(status))
3864 st = WSTOPSIG(status);
3867 st = WTERMSIG(status);
3869 if (st == SIGINT || st == SIGPIPE)
3872 if (WIFSTOPPED(status))
3877 col = fmtstr(s, 32, strsignal(st));
3878 if (WCOREDUMP(status)) {
3879 col += fmtstr(s + col, 16, " (core dumped)");
3881 } else if (!sigonly) {
3882 st = WEXITSTATUS(status);
3884 col = fmtstr(s, 16, "Done(%d)", st);
3886 col = fmtstr(s, 16, "Done");
3893 dowait(int wait_flags, struct job *job)
3898 struct job *thisjob;
3901 TRACE(("dowait(0x%x) called\n", wait_flags));
3903 /* Do a wait system call. If job control is compiled in, we accept
3904 * stopped processes. wait_flags may have WNOHANG, preventing blocking.
3905 * NB: _not_ safe_waitpid, we need to detect EINTR */
3907 wait_flags |= WUNTRACED;
3908 pid = waitpid(-1, &status, wait_flags);
3909 TRACE(("wait returns pid=%d, status=0x%x, errno=%d(%s)\n",
3910 pid, status, errno, strerror(errno)));
3916 for (jp = curjob; jp; jp = jp->prev_job) {
3917 struct procstat *ps;
3918 struct procstat *psend;
3919 if (jp->state == JOBDONE)
3923 psend = ps + jp->nprocs;
3925 if (ps->ps_pid == pid) {
3926 TRACE(("Job %d: changing status of proc %d "
3927 "from 0x%x to 0x%x\n",
3928 jobno(jp), pid, ps->ps_status, status));
3929 ps->ps_status = status;
3932 if (ps->ps_status == -1)
3935 if (state == JOBRUNNING)
3937 if (WIFSTOPPED(ps->ps_status)) {
3938 jp->stopstatus = ps->ps_status;
3942 } while (++ps < psend);
3947 if (!WIFSTOPPED(status))
3953 if (state != JOBRUNNING) {
3954 thisjob->changed = 1;
3956 if (thisjob->state != state) {
3957 TRACE(("Job %d: changing state from %d to %d\n",
3958 jobno(thisjob), thisjob->state, state));
3959 thisjob->state = state;
3961 if (state == JOBSTOPPED) {
3962 set_curjob(thisjob, CUR_STOPPED);
3971 if (thisjob && thisjob == job) {
3975 len = sprint_status(s, status, 1);
3986 blocking_wait_with_raise_on_sig(void)
3988 pid_t pid = dowait(DOWAIT_BLOCK, NULL);
3989 if (pid <= 0 && pending_sig)
3990 raise_exception(EXSIG);
3996 showjob(FILE *out, struct job *jp, int mode)
3998 struct procstat *ps;
3999 struct procstat *psend;
4006 if (mode & SHOW_ONLY_PGID) { /* jobs -p */
4007 /* just output process (group) id of pipeline */
4008 fprintf(out, "%d\n", ps->ps_pid);
4012 col = fmtstr(s, 16, "[%d] ", jobno(jp));
4017 else if (curjob && jp == curjob->prev_job)
4020 if (mode & SHOW_PIDS)
4021 col += fmtstr(s + col, 16, "%d ", ps->ps_pid);
4023 psend = ps + jp->nprocs;
4025 if (jp->state == JOBRUNNING) {
4026 strcpy(s + col, "Running");
4027 col += sizeof("Running") - 1;
4029 int status = psend[-1].ps_status;
4030 if (jp->state == JOBSTOPPED)
4031 status = jp->stopstatus;
4032 col += sprint_status(s + col, status, 0);
4034 /* By now, "[JOBID]* [maybe PID] STATUS" is printed */
4036 /* This loop either prints "<cmd1> | <cmd2> | <cmd3>" line
4037 * or prints several "PID | <cmdN>" lines,
4038 * depending on SHOW_PIDS bit.
4039 * We do not print status of individual processes
4040 * between PID and <cmdN>. bash does it, but not very well:
4041 * first line shows overall job status, not process status,
4042 * making it impossible to know 1st process status.
4046 /* for each process */
4049 if (mode & SHOW_PIDS)
4050 col = fmtstr(s, 48, "\n%*c%d ", indent_col, ' ', ps->ps_pid) - 1;
4052 fprintf(out, "%s%*c%s%s",
4054 33 - col >= 0 ? 33 - col : 0, ' ',
4055 ps == jp->ps ? "" : "| ",
4058 } while (++ps != psend);
4059 outcslow('\n', out);
4063 if (jp->state == JOBDONE) {
4064 TRACE(("showjob: freeing job %d\n", jobno(jp)));
4070 * Print a list of jobs. If "change" is nonzero, only print jobs whose
4071 * statuses have changed since the last call to showjobs.
4074 showjobs(FILE *out, int mode)
4078 TRACE(("showjobs(0x%x) called\n", mode));
4080 /* Handle all finished jobs */
4081 while (dowait(DOWAIT_NONBLOCK, NULL) > 0)
4084 for (jp = curjob; jp; jp = jp->prev_job) {
4085 if (!(mode & SHOW_CHANGED) || jp->changed) {
4086 showjob(out, jp, mode);
4091 static int FAST_FUNC
4092 jobscmd(int argc UNUSED_PARAM, char **argv)
4097 while ((m = nextopt("lp")) != '\0') {
4101 mode |= SHOW_ONLY_PGID;
4107 showjob(stdout, getjob(*argv, 0), mode);
4110 showjobs(stdout, mode);
4117 /* Called only on finished or stopped jobs (no members are running) */
4119 getstatus(struct job *job)
4123 struct procstat *ps;
4125 /* Fetch last member's status */
4126 ps = job->ps + job->nprocs - 1;
4127 status = ps->ps_status;
4129 /* "set -o pipefail" mode: use last _nonzero_ status */
4130 while (status == 0 && --ps >= job->ps)
4131 status = ps->ps_status;
4134 retval = WEXITSTATUS(status);
4135 if (!WIFEXITED(status)) {
4137 retval = WSTOPSIG(status);
4138 if (!WIFSTOPPED(status))
4141 /* XXX: limits number of signals */
4142 retval = WTERMSIG(status);
4144 if (retval == SIGINT)
4150 TRACE(("getstatus: job %d, nproc %d, status 0x%x, retval 0x%x\n",
4151 jobno(job), job->nprocs, status, retval));
4155 static int FAST_FUNC
4156 waitcmd(int argc UNUSED_PARAM, char **argv)
4163 raise_exception(EXSIG);
4170 /* wait for all jobs */
4174 if (!jp) /* no running procs */
4176 if (jp->state == JOBRUNNING)
4181 blocking_wait_with_raise_on_sig();
4183 * "When bash is waiting for an asynchronous command via
4184 * the wait builtin, the reception of a signal for which a trap
4185 * has been set will cause the wait builtin to return immediately
4186 * with an exit status greater than 128, immediately after which
4187 * the trap is executed."
4189 * blocking_wait_with_raise_on_sig raises signal handlers
4190 * if it gets no pid (pid < 0). However,
4191 * if child sends us a signal *and immediately exits*,
4192 * blocking_wait_with_raise_on_sig gets pid > 0
4193 * and does not handle pending_sig. Check this case: */
4195 raise_exception(EXSIG);
4201 if (**argv != '%') {
4202 pid_t pid = number(*argv);
4207 if (job->ps[job->nprocs - 1].ps_pid == pid)
4209 job = job->prev_job;
4212 job = getjob(*argv, 0);
4213 /* loop until process terminated or stopped */
4214 while (job->state == JOBRUNNING)
4215 blocking_wait_with_raise_on_sig();
4217 retval = getstatus(job);
4230 struct job *jp, *jq;
4232 len = njobs * sizeof(*jp);
4234 jp = ckrealloc(jq, len + 4 * sizeof(*jp));
4236 offset = (char *)jp - (char *)jq;
4238 /* Relocate pointers */
4241 jq = (struct job *)((char *)jq + l);
4245 #define joff(p) ((struct job *)((char *)(p) + l))
4246 #define jmove(p) (p) = (void *)((char *)(p) + offset)
4247 if (joff(jp)->ps == &jq->ps0)
4248 jmove(joff(jp)->ps);
4249 if (joff(jp)->prev_job)
4250 jmove(joff(jp)->prev_job);
4260 jp = (struct job *)((char *)jp + len);
4264 } while (--jq >= jp);
4269 * Return a new job structure.
4270 * Called with interrupts off.
4273 makejob(/*union node *node,*/ int nprocs)
4278 for (i = njobs, jp = jobtab; ; jp++) {
4285 if (jp->state != JOBDONE || !jp->waited)
4294 memset(jp, 0, sizeof(*jp));
4296 /* jp->jobctl is a bitfield.
4297 * "jp->jobctl |= jobctl" likely to give awful code */
4301 jp->prev_job = curjob;
4306 jp->ps = ckmalloc(nprocs * sizeof(struct procstat));
4308 TRACE(("makejob(%d) returns %%%d\n", nprocs,
4315 * Return a string identifying a command (to be printed by the
4318 static char *cmdnextc;
4321 cmdputs(const char *s)
4323 static const char vstype[VSTYPE + 1][3] = {
4324 "", "}", "-", "+", "?", "=",
4325 "%", "%%", "#", "##"
4326 IF_ASH_BASH_COMPAT(, ":", "/", "//")
4329 const char *p, *str;
4333 unsigned char subtype = 0;
4337 nextc = makestrspace((strlen(s) + 1) * 8, cmdnextc);
4339 while ((c = *p++) != '\0') {
4347 if ((subtype & VSTYPE) == VSLENGTH)
4351 if (!(subtype & VSQUOTE) == !(quoted & 1))
4357 str = "\"}" + !(quoted & 1);
4364 case CTLBACKQ+CTLQUOTE:
4367 #if ENABLE_SH_MATH_SUPPORT
4382 if ((subtype & VSTYPE) != VSNORMAL)
4384 str = vstype[subtype & VSTYPE];
4385 if (subtype & VSNUL)
4394 /* These can only happen inside quotes */
4407 while ((c = *str++) != '\0') {
4410 } /* while *p++ not NUL */
4413 USTPUTC('"', nextc);
4419 /* cmdtxt() and cmdlist() call each other */
4420 static void cmdtxt(union node *n);
4423 cmdlist(union node *np, int sep)
4425 for (; np; np = np->narg.next) {
4429 if (sep && np->narg.next)
4435 cmdtxt(union node *n)
4438 struct nodelist *lp;
4449 lp = n->npipe.cmdlist;
4467 cmdtxt(n->nbinary.ch1);
4483 cmdtxt(n->nif.test);
4485 if (n->nif.elsepart) {
4486 cmdtxt(n->nif.ifpart);
4488 n = n->nif.elsepart;
4506 cmdtxt(n->nbinary.ch1);
4516 cmdputs(n->nfor.var);
4518 cmdlist(n->nfor.args, 1);
4523 cmdputs(n->narg.text);
4527 cmdlist(n->ncmd.args, 1);
4528 cmdlist(n->ncmd.redirect, 0);
4541 cmdputs(n->ncase.expr->narg.text);
4543 for (np = n->ncase.cases; np; np = np->nclist.next) {
4544 cmdtxt(np->nclist.pattern);
4546 cmdtxt(np->nclist.body);
4560 #if ENABLE_ASH_BASH_COMPAT
4575 cmdputs(utoa(n->nfile.fd));
4577 if (n->type == NTOFD || n->type == NFROMFD) {
4578 cmdputs(utoa(n->ndup.dupfd));
4587 commandtext(union node *n)
4591 STARTSTACKSTR(cmdnextc);
4593 name = stackblock();
4594 TRACE(("commandtext: name %p, end %p\n\t\"%s\"\n",
4595 name, cmdnextc, cmdnextc));
4596 return ckstrdup(name);
4601 * Fork off a subshell. If we are doing job control, give the subshell its
4602 * own process group. Jp is a job structure that the job is to be added to.
4603 * N is the command that will be evaluated by the child. Both jp and n may
4604 * be NULL. The mode parameter can be one of the following:
4605 * FORK_FG - Fork off a foreground process.
4606 * FORK_BG - Fork off a background process.
4607 * FORK_NOJOB - Like FORK_FG, but don't give the process its own
4608 * process group even if job control is on.
4610 * When job control is turned off, background processes have their standard
4611 * input redirected to /dev/null (except for the second and later processes
4614 * Called with interrupts off.
4617 * Clear traps on a fork.
4624 for (tp = trap; tp < &trap[NSIG]; tp++) {
4625 if (*tp && **tp) { /* trap not NULL or "" (SIG_IGN) */
4627 if (trap_ptr == trap)
4629 /* else: it "belongs" to trap_ptr vector, don't free */
4631 if ((tp - trap) != 0)
4632 setsignal(tp - trap);
4639 /* Lives far away from here, needed for forkchild */
4640 static void closescript(void);
4642 /* Called after fork(), in child */
4643 static NOINLINE void
4644 forkchild(struct job *jp, union node *n, int mode)
4648 TRACE(("Child shell %d\n", getpid()));
4652 /* man bash: "Non-builtin commands run by bash have signal handlers
4653 * set to the values inherited by the shell from its parent".
4654 * Do we do it correctly? */
4658 if (mode == FORK_NOJOB /* is it `xxx` ? */
4659 && n && n->type == NCMD /* is it single cmd? */
4660 /* && n->ncmd.args->type == NARG - always true? */
4661 && n->ncmd.args && strcmp(n->ncmd.args->narg.text, "trap") == 0
4662 && n->ncmd.args->narg.next == NULL /* "trap" with no arguments */
4663 /* && n->ncmd.args->narg.backquote == NULL - do we need to check this? */
4665 TRACE(("Trap hack\n"));
4666 /* Awful hack for `trap` or $(trap).
4668 * http://www.opengroup.org/onlinepubs/009695399/utilities/trap.html
4669 * contains an example where "trap" is executed in a subshell:
4671 * save_traps=$(trap)
4673 * eval "$save_traps"
4675 * Standard does not say that "trap" in subshell shall print
4676 * parent shell's traps. It only says that its output
4677 * must have suitable form, but then, in the above example
4678 * (which is not supposed to be normative), it implies that.
4680 * bash (and probably other shell) does implement it
4681 * (traps are reset to defaults, but "trap" still shows them),
4682 * but as a result, "trap" logic is hopelessly messed up:
4685 * trap -- 'echo Ho' SIGWINCH <--- we have a handler
4686 * # (trap) <--- trap is in subshell - no output (correct, traps are reset)
4687 * # true | trap <--- trap is in subshell - no output (ditto)
4688 * # echo `true | trap` <--- in subshell - output (but traps are reset!)
4689 * trap -- 'echo Ho' SIGWINCH
4690 * # echo `(trap)` <--- in subshell in subshell - output
4691 * trap -- 'echo Ho' SIGWINCH
4692 * # echo `true | (trap)` <--- in subshell in subshell in subshell - output!
4693 * trap -- 'echo Ho' SIGWINCH
4695 * The rules when to forget and when to not forget traps
4696 * get really complex and nonsensical.
4698 * Our solution: ONLY bare $(trap) or `trap` is special.
4700 /* Save trap handler strings for trap builtin to print */
4701 trap_ptr = memcpy(xmalloc(sizeof(trap)), trap, sizeof(trap));
4702 /* Fall through into clearing traps */
4706 /* do job control only in root shell */
4708 if (mode != FORK_NOJOB && jp->jobctl && !oldlvl) {
4711 if (jp->nprocs == 0)
4714 pgrp = jp->ps[0].ps_pid;
4715 /* this can fail because we are doing it in the parent also */
4717 if (mode == FORK_FG)
4718 xtcsetpgrp(ttyfd, pgrp);
4723 if (mode == FORK_BG) {
4724 /* man bash: "When job control is not in effect,
4725 * asynchronous commands ignore SIGINT and SIGQUIT" */
4728 if (jp->nprocs == 0) {
4730 if (open(bb_dev_null, O_RDONLY) != 0)
4731 ash_msg_and_raise_error("can't open '%s'", bb_dev_null);
4735 if (iflag) { /* why if iflag only? */
4740 * "In all cases, bash ignores SIGQUIT. Non-builtin
4741 * commands run by bash have signal handlers
4742 * set to the values inherited by the shell
4744 * Take care of the second rule: */
4748 if (n && n->type == NCMD
4749 && n->ncmd.args && strcmp(n->ncmd.args->narg.text, "jobs") == 0
4751 TRACE(("Job hack\n"));
4752 /* "jobs": we do not want to clear job list for it,
4753 * instead we remove only _its_ own_ job from job list.
4754 * This makes "jobs .... | cat" more useful.
4760 for (jp = curjob; jp; jp = jp->prev_job)
4765 /* Called after fork(), in parent */
4767 #define forkparent(jp, n, mode, pid) forkparent(jp, mode, pid)
4770 forkparent(struct job *jp, union node *n, int mode, pid_t pid)
4772 TRACE(("In parent shell: child = %d\n", pid));
4774 while (jobless && dowait(DOWAIT_NONBLOCK, NULL) > 0)
4780 if (mode != FORK_NOJOB && jp->jobctl) {
4783 if (jp->nprocs == 0)
4786 pgrp = jp->ps[0].ps_pid;
4787 /* This can fail because we are doing it in the child also */
4791 if (mode == FORK_BG) {
4792 backgndpid = pid; /* set $! */
4793 set_curjob(jp, CUR_RUNNING);
4796 struct procstat *ps = &jp->ps[jp->nprocs++];
4799 ps->ps_cmd = nullstr;
4801 if (doing_jobctl && n)
4802 ps->ps_cmd = commandtext(n);
4808 forkshell(struct job *jp, union node *n, int mode)
4812 TRACE(("forkshell(%%%d, %p, %d) called\n", jobno(jp), n, mode));
4815 TRACE(("Fork failed, errno=%d", errno));
4818 ash_msg_and_raise_error("can't fork");
4821 CLEAR_RANDOM_T(&random_gen); /* or else $RANDOM repeats in child */
4822 forkchild(jp, n, mode);
4824 forkparent(jp, n, mode, pid);
4830 * Wait for job to finish.
4832 * Under job control we have the problem that while a child process
4833 * is running interrupts generated by the user are sent to the child
4834 * but not to the shell. This means that an infinite loop started by
4835 * an interactive user may be hard to kill. With job control turned off,
4836 * an interactive user may place an interactive program inside a loop.
4837 * If the interactive program catches interrupts, the user doesn't want
4838 * these interrupts to also abort the loop. The approach we take here
4839 * is to have the shell ignore interrupt signals while waiting for a
4840 * foreground process to terminate, and then send itself an interrupt
4841 * signal if the child process was terminated by an interrupt signal.
4842 * Unfortunately, some programs want to do a bit of cleanup and then
4843 * exit on interrupt; unless these processes terminate themselves by
4844 * sending a signal to themselves (instead of calling exit) they will
4845 * confuse this approach.
4847 * Called with interrupts off.
4850 waitforjob(struct job *jp)
4854 TRACE(("waitforjob(%%%d) called\n", jobno(jp)));
4857 while (jp->state == JOBRUNNING) {
4858 /* In non-interactive shells, we _can_ get
4859 * a keyboard signal here and be EINTRed,
4860 * but we just loop back, waiting for command to complete.
4863 * "If bash is waiting for a command to complete and receives
4864 * a signal for which a trap has been set, the trap
4865 * will not be executed until the command completes."
4867 * Reality is that even if trap is not set, bash
4868 * will not act on the signal until command completes.
4869 * Try this. sleep5intoff.c:
4870 * #include <signal.h>
4871 * #include <unistd.h>
4874 * sigemptyset(&set);
4875 * sigaddset(&set, SIGINT);
4876 * sigaddset(&set, SIGQUIT);
4877 * sigprocmask(SIG_BLOCK, &set, NULL);
4881 * $ bash -c './sleep5intoff; echo hi'
4882 * ^C^C^C^C <--- pressing ^C once a second
4884 * $ bash -c './sleep5intoff; echo hi'
4885 * ^\^\^\^\hi <--- pressing ^\ (SIGQUIT)
4888 dowait(DOWAIT_BLOCK, jp);
4895 xtcsetpgrp(ttyfd, rootpid);
4897 * This is truly gross.
4898 * If we're doing job control, then we did a TIOCSPGRP which
4899 * caused us (the shell) to no longer be in the controlling
4900 * session -- so we wouldn't have seen any ^C/SIGINT. So, we
4901 * intuit from the subprocess exit status whether a SIGINT
4902 * occurred, and if so interrupt ourselves. Yuck. - mycroft
4904 if (jp->sigint) /* TODO: do the same with all signals */
4905 raise(SIGINT); /* ... by raise(jp->sig) instead? */
4907 if (jp->state == JOBDONE)
4914 * return 1 if there are stopped jobs, otherwise 0
4926 if (jp && jp->state == JOBSTOPPED) {
4927 out2str("You have stopped jobs.\n");
4936 /* ============ redir.c
4938 * Code for dealing with input/output redirection.
4941 #define EMPTY -2 /* marks an unused slot in redirtab */
4942 #define CLOSED -3 /* marks a slot of previously-closed fd */
4945 * Open a file in noclobber mode.
4946 * The code was copied from bash.
4949 noclobberopen(const char *fname)
4952 struct stat finfo, finfo2;
4955 * If the file exists and is a regular file, return an error
4958 r = stat(fname, &finfo);
4959 if (r == 0 && S_ISREG(finfo.st_mode)) {
4965 * If the file was not present (r != 0), make sure we open it
4966 * exclusively so that if it is created before we open it, our open
4967 * will fail. Make sure that we do not truncate an existing file.
4968 * Note that we don't turn on O_EXCL unless the stat failed -- if the
4969 * file was not a regular file, we leave O_EXCL off.
4972 return open(fname, O_WRONLY|O_CREAT|O_EXCL, 0666);
4973 fd = open(fname, O_WRONLY|O_CREAT, 0666);
4975 /* If the open failed, return the file descriptor right away. */
4980 * OK, the open succeeded, but the file may have been changed from a
4981 * non-regular file to a regular file between the stat and the open.
4982 * We are assuming that the O_EXCL open handles the case where FILENAME
4983 * did not exist and is symlinked to an existing file between the stat
4988 * If we can open it and fstat the file descriptor, and neither check
4989 * revealed that it was a regular file, and the file has not been
4990 * replaced, return the file descriptor.
4992 if (fstat(fd, &finfo2) == 0
4993 && !S_ISREG(finfo2.st_mode)
4994 && finfo.st_dev == finfo2.st_dev
4995 && finfo.st_ino == finfo2.st_ino
5000 /* The file has been replaced. badness. */
5007 * Handle here documents. Normally we fork off a process to write the
5008 * data to a pipe. If the document is short, we can stuff the data in
5009 * the pipe without forking.
5011 /* openhere needs this forward reference */
5012 static void expandhere(union node *arg, int fd);
5014 openhere(union node *redir)
5020 ash_msg_and_raise_error("pipe call failed");
5021 if (redir->type == NHERE) {
5022 len = strlen(redir->nhere.doc->narg.text);
5023 if (len <= PIPE_BUF) {
5024 full_write(pip[1], redir->nhere.doc->narg.text, len);
5028 if (forkshell((struct job *)NULL, (union node *)NULL, FORK_NOJOB) == 0) {
5031 ignoresig(SIGINT); //signal(SIGINT, SIG_IGN);
5032 ignoresig(SIGQUIT); //signal(SIGQUIT, SIG_IGN);
5033 ignoresig(SIGHUP); //signal(SIGHUP, SIG_IGN);
5034 ignoresig(SIGTSTP); //signal(SIGTSTP, SIG_IGN);
5035 signal(SIGPIPE, SIG_DFL);
5036 if (redir->type == NHERE)
5037 full_write(pip[1], redir->nhere.doc->narg.text, len);
5039 expandhere(redir->nhere.doc, pip[1]);
5040 _exit(EXIT_SUCCESS);
5048 openredirect(union node *redir)
5053 switch (redir->nfile.type) {
5055 fname = redir->nfile.expfname;
5056 f = open(fname, O_RDONLY);
5061 fname = redir->nfile.expfname;
5062 f = open(fname, O_RDWR|O_CREAT, 0666);
5067 #if ENABLE_ASH_BASH_COMPAT
5070 /* Take care of noclobber mode. */
5072 fname = redir->nfile.expfname;
5073 f = noclobberopen(fname);
5080 fname = redir->nfile.expfname;
5081 f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666);
5086 fname = redir->nfile.expfname;
5087 f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666);
5095 /* Fall through to eliminate warning. */
5096 /* Our single caller does this itself */
5103 f = openhere(redir);
5109 ash_msg_and_raise_error("can't create %s: %s", fname, errmsg(errno, "nonexistent directory"));
5111 ash_msg_and_raise_error("can't open %s: %s", fname, errmsg(errno, "no such file"));
5115 * Copy a file descriptor to be >= to. Returns -1
5116 * if the source file descriptor is closed, EMPTY if there are no unused
5117 * file descriptors left.
5119 /* 0x800..00: bit to set in "to" to request dup2 instead of fcntl(F_DUPFD).
5120 * old code was doing close(to) prior to copyfd() to achieve the same */
5122 COPYFD_EXACT = (int)~(INT_MAX),
5123 COPYFD_RESTORE = (int)((unsigned)COPYFD_EXACT >> 1),
5126 copyfd(int from, int to)
5130 if (to & COPYFD_EXACT) {
5131 to &= ~COPYFD_EXACT;
5133 newfd = dup2(from, to);
5135 newfd = fcntl(from, F_DUPFD, to);
5138 if (errno == EMFILE)
5140 /* Happens when source fd is not open: try "echo >&99" */
5141 ash_msg_and_raise_error("%d: %m", from);
5146 /* Struct def and variable are moved down to the first usage site */
5151 struct redirtab *next;
5154 struct two_fd_t two_fd[];
5156 #define redirlist (G_var.redirlist)
5158 static int need_to_remember(struct redirtab *rp, int fd)
5162 if (!rp) /* remembering was not requested */
5165 for (i = 0; i < rp->pair_count; i++) {
5166 if (rp->two_fd[i].orig == fd) {
5167 /* already remembered */
5174 /* "hidden" fd is a fd used to read scripts, or a copy of such */
5175 static int is_hidden_fd(struct redirtab *rp, int fd)
5178 struct parsefile *pf;
5182 /* Check open scripts' fds */
5185 /* We skip pf_fd == 0 case because of the following case:
5186 * $ ash # running ash interactively
5188 * and in script.sh: "exec 9>&0".
5189 * Even though top-level pf_fd _is_ 0,
5190 * it's still ok to use it: "read" builtin uses it,
5191 * why should we cripple "exec" builtin?
5193 if (pf->pf_fd > 0 && fd == pf->pf_fd) {
5201 /* Check saved fds of redirects */
5202 fd |= COPYFD_RESTORE;
5203 for (i = 0; i < rp->pair_count; i++) {
5204 if (rp->two_fd[i].copy == fd) {
5212 * Process a list of redirection commands. If the REDIR_PUSH flag is set,
5213 * old file descriptors are stashed away so that the redirection can be
5214 * undone by calling popredir.
5216 /* flags passed to redirect */
5217 #define REDIR_PUSH 01 /* save previous values of file descriptors */
5218 #define REDIR_SAVEFD2 03 /* set preverrout */
5220 redirect(union node *redir, int flags)
5222 struct redirtab *sv;
5227 int copied_fd2 = -1;
5237 if (flags & REDIR_PUSH) {
5238 union node *tmp = redir;
5241 #if ENABLE_ASH_BASH_COMPAT
5242 if (tmp->nfile.type == NTO2)
5245 tmp = tmp->nfile.next;
5247 sv = ckmalloc(sizeof(*sv) + sv_pos * sizeof(sv->two_fd[0]));
5248 sv->next = redirlist;
5249 sv->pair_count = sv_pos;
5251 sv->nullredirs = g_nullredirs - 1;
5253 while (sv_pos > 0) {
5255 sv->two_fd[sv_pos].orig = sv->two_fd[sv_pos].copy = EMPTY;
5261 fd = redir->nfile.fd;
5262 if (redir->nfile.type == NTOFD || redir->nfile.type == NFROMFD) {
5263 right_fd = redir->ndup.dupfd;
5264 //bb_error_msg("doing %d > %d", fd, right_fd);
5265 /* redirect from/to same file descriptor? */
5268 /* "echo >&10" and 10 is a fd opened to a sh script? */
5269 if (is_hidden_fd(sv, right_fd)) {
5270 errno = EBADF; /* as if it is closed */
5271 ash_msg_and_raise_error("%d: %m", right_fd);
5275 newfd = openredirect(redir); /* always >= 0 */
5277 /* Descriptor wasn't open before redirect.
5278 * Mark it for close in the future */
5279 if (need_to_remember(sv, fd)) {
5280 goto remember_to_close;
5285 #if ENABLE_ASH_BASH_COMPAT
5288 if (need_to_remember(sv, fd)) {
5289 /* Copy old descriptor */
5290 /* Careful to not accidentally "save"
5291 * to the same fd as right side fd in N>&M */
5292 int minfd = right_fd < 10 ? 10 : right_fd + 1;
5293 i = fcntl(fd, F_DUPFD, minfd);
5294 /* You'd expect copy to be CLOEXECed. Currently these extra "saved" fds
5295 * are closed in popredir() in the child, preventing them from leaking
5296 * into child. (popredir() also cleans up the mess in case of failures)
5301 /* Strange error (e.g. "too many files" EMFILE?) */
5305 ash_msg_and_raise_error("%d: %m", fd);
5308 /* EBADF: it is not open - good, remember to close it */
5311 } else { /* fd is open, save its copy */
5312 /* "exec fd>&-" should not close fds
5313 * which point to script file(s).
5314 * Force them to be restored afterwards */
5315 if (is_hidden_fd(sv, fd))
5316 i |= COPYFD_RESTORE;
5320 sv->two_fd[sv_pos].orig = fd;
5321 sv->two_fd[sv_pos].copy = i;
5325 /* NTOFD/NFROMFD: copy redir->ndup.dupfd to fd */
5326 if (redir->ndup.dupfd < 0) { /* "fd>&-" */
5327 /* Don't want to trigger debugging */
5331 copyfd(redir->ndup.dupfd, fd | COPYFD_EXACT);
5333 } else if (fd != newfd) { /* move newfd to fd */
5334 copyfd(newfd, fd | COPYFD_EXACT);
5335 #if ENABLE_ASH_BASH_COMPAT
5336 if (!(redir->nfile.type == NTO2 && fd == 2))
5340 #if ENABLE_ASH_BASH_COMPAT
5341 if (redir->nfile.type == NTO2 && fd == 1) {
5342 /* We already redirected it to fd 1, now copy it to 2 */
5348 } while ((redir = redir->nfile.next) != NULL);
5351 if ((flags & REDIR_SAVEFD2) && copied_fd2 >= 0)
5352 preverrout_fd = copied_fd2;
5356 * Undo the effects of the last redirection.
5359 popredir(int drop, int restore)
5361 struct redirtab *rp;
5364 if (--g_nullredirs >= 0)
5368 for (i = 0; i < rp->pair_count; i++) {
5369 int fd = rp->two_fd[i].orig;
5370 int copy = rp->two_fd[i].copy;
5371 if (copy == CLOSED) {
5376 if (copy != EMPTY) {
5377 if (!drop || (restore && (copy & COPYFD_RESTORE))) {
5378 copy &= ~COPYFD_RESTORE;
5380 copyfd(copy, fd | COPYFD_EXACT);
5382 close(copy & ~COPYFD_RESTORE);
5385 redirlist = rp->next;
5386 g_nullredirs = rp->nullredirs;
5392 * Undo all redirections. Called on error or interrupt.
5396 * Discard all saved file descriptors.
5399 clearredir(int drop)
5405 popredir(drop, /*restore:*/ 0);
5410 redirectsafe(union node *redir, int flags)
5413 volatile int saveint;
5414 struct jmploc *volatile savehandler = exception_handler;
5415 struct jmploc jmploc;
5418 /* "echo 9>/dev/null; echo >&9; echo result: $?" - result should be 1, not 2! */
5419 err = setjmp(jmploc.loc); // huh?? was = setjmp(jmploc.loc) * 2;
5421 exception_handler = &jmploc;
5422 redirect(redir, flags);
5424 exception_handler = savehandler;
5425 if (err && exception_type != EXERROR)
5426 longjmp(exception_handler->loc, 1);
5427 RESTORE_INT(saveint);
5432 /* ============ Routines to expand arguments to commands
5434 * We have to deal with backquotes, shell variables, and file metacharacters.
5437 #if ENABLE_SH_MATH_SUPPORT
5439 ash_arith(const char *s)
5441 arith_eval_hooks_t math_hooks;
5445 math_hooks.lookupvar = lookupvar;
5446 math_hooks.setvar = setvar2;
5447 math_hooks.endofname = endofname;
5450 result = arith(s, &errcode, &math_hooks);
5453 ash_msg_and_raise_error("exponent less than 0");
5455 ash_msg_and_raise_error("divide by zero");
5457 ash_msg_and_raise_error("expression recursion loop detected");
5458 raise_error_syntax(s);
5469 #define EXP_FULL 0x1 /* perform word splitting & file globbing */
5470 #define EXP_TILDE 0x2 /* do normal tilde expansion */
5471 #define EXP_VARTILDE 0x4 /* expand tildes in an assignment */
5472 #define EXP_REDIR 0x8 /* file glob for a redirection (1 match only) */
5473 #define EXP_CASE 0x10 /* keeps quotes around for CASE pattern */
5474 #define EXP_RECORD 0x20 /* need to record arguments for ifs breakup */
5475 #define EXP_VARTILDE2 0x40 /* expand tildes after colons only */
5476 #define EXP_WORD 0x80 /* expand word in parameter expansion */
5477 #define EXP_QWORD 0x100 /* expand word in quoted parameter expansion */
5481 #define RMESCAPE_ALLOC 0x1 /* Allocate a new string */
5482 #define RMESCAPE_GLOB 0x2 /* Add backslashes for glob */
5483 #define RMESCAPE_QUOTED 0x4 /* Remove CTLESC unless in quotes */
5484 #define RMESCAPE_GROW 0x8 /* Grow strings instead of stalloc */
5485 #define RMESCAPE_HEAP 0x10 /* Malloc strings instead of stalloc */
5488 * Structure specifying which parts of the string should be searched
5489 * for IFS characters.
5492 struct ifsregion *next; /* next region in list */
5493 int begoff; /* offset of start of region */
5494 int endoff; /* offset of end of region */
5495 int nulonly; /* search for nul bytes only */
5499 struct strlist *list;
5500 struct strlist **lastp;
5503 /* output of current string */
5504 static char *expdest;
5505 /* list of back quote expressions */
5506 static struct nodelist *argbackq;
5507 /* first struct in list of ifs regions */
5508 static struct ifsregion ifsfirst;
5509 /* last struct in list */
5510 static struct ifsregion *ifslastp;
5511 /* holds expanded arg list */
5512 static struct arglist exparg;
5522 expdest = makestrspace(32, expdest);
5523 len = fmtstr(expdest, 32, arith_t_fmt, num);
5524 STADJUST(len, expdest);
5529 esclen(const char *start, const char *p)
5533 while (p > start && (unsigned char)*--p == CTLESC) {
5540 * Remove any CTLESC characters from a string.
5543 rmescapes(char *str, int flag)
5545 static const char qchars[] ALIGN1 = { CTLESC, CTLQUOTEMARK, '\0' };
5549 unsigned protect_against_glob;
5552 p = strpbrk(str, qchars);
5558 if (flag & RMESCAPE_ALLOC) {
5559 size_t len = p - str;
5560 size_t fulllen = len + strlen(p) + 1;
5562 if (flag & RMESCAPE_GROW) {
5563 int strloc = str - (char *)stackblock();
5564 r = makestrspace(fulllen, expdest);
5565 /* p and str may be invalidated by makestrspace */
5566 str = (char *)stackblock() + strloc;
5568 } else if (flag & RMESCAPE_HEAP) {
5569 r = ckmalloc(fulllen);
5571 r = stalloc(fulllen);
5575 q = (char *)memcpy(q, str, len) + len;
5579 inquotes = (flag & RMESCAPE_QUOTED) ^ RMESCAPE_QUOTED;
5580 globbing = flag & RMESCAPE_GLOB;
5581 protect_against_glob = globbing;
5583 if ((unsigned char)*p == CTLQUOTEMARK) {
5584 // TODO: if no RMESCAPE_QUOTED in flags, inquotes never becomes 0
5585 // (alternates between RMESCAPE_QUOTED and ~RMESCAPE_QUOTED). Is it ok?
5586 // Note: both inquotes and protect_against_glob only affect whether
5587 // CTLESC,<ch> gets converted to <ch> or to \<ch>
5588 inquotes = ~inquotes;
5590 protect_against_glob = globbing;
5594 /* naked back slash */
5595 protect_against_glob = 0;
5598 if ((unsigned char)*p == CTLESC) {
5600 if (protect_against_glob && inquotes && *p != '/') {
5604 protect_against_glob = globbing;
5609 if (flag & RMESCAPE_GROW) {
5611 STADJUST(q - r + 1, expdest);
5615 #define pmatch(a, b) !fnmatch((a), (b), 0)
5618 * Prepare a pattern for a expmeta (internal glob(3)) call.
5620 * Returns an stalloced string.
5623 preglob(const char *pattern, int quoted, int flag)
5625 flag |= RMESCAPE_GLOB;
5627 flag |= RMESCAPE_QUOTED;
5629 return rmescapes((char *)pattern, flag);
5633 * Put a string on the stack.
5636 memtodest(const char *p, size_t len, int syntax, int quotes)
5640 q = makestrspace(quotes ? len * 2 : len, q);
5643 unsigned char c = *p++;
5647 int n = SIT(c, syntax);
5648 if (n == CCTL || n == CBACK)
5658 strtodest(const char *p, int syntax, int quotes)
5660 memtodest(p, strlen(p), syntax, quotes);
5664 * Record the fact that we have to scan this region of the
5665 * string for IFS characters.
5668 recordregion(int start, int end, int nulonly)
5670 struct ifsregion *ifsp;
5672 if (ifslastp == NULL) {
5676 ifsp = ckzalloc(sizeof(*ifsp));
5677 /*ifsp->next = NULL; - ckzalloc did it */
5678 ifslastp->next = ifsp;
5682 ifslastp->begoff = start;
5683 ifslastp->endoff = end;
5684 ifslastp->nulonly = nulonly;
5688 removerecordregions(int endoff)
5690 if (ifslastp == NULL)
5693 if (ifsfirst.endoff > endoff) {
5694 while (ifsfirst.next) {
5695 struct ifsregion *ifsp;
5697 ifsp = ifsfirst.next->next;
5698 free(ifsfirst.next);
5699 ifsfirst.next = ifsp;
5702 if (ifsfirst.begoff > endoff) {
5705 ifslastp = &ifsfirst;
5706 ifsfirst.endoff = endoff;
5711 ifslastp = &ifsfirst;
5712 while (ifslastp->next && ifslastp->next->begoff < endoff)
5713 ifslastp = ifslastp->next;
5714 while (ifslastp->next) {
5715 struct ifsregion *ifsp;
5717 ifsp = ifslastp->next->next;
5718 free(ifslastp->next);
5719 ifslastp->next = ifsp;
5722 if (ifslastp->endoff > endoff)
5723 ifslastp->endoff = endoff;
5727 exptilde(char *startp, char *p, int flags)
5733 int quotes = flags & (EXP_FULL | EXP_CASE | EXP_REDIR);
5738 while ((c = *++p) != '\0') {
5745 if (flags & EXP_VARTILDE)
5755 if (*name == '\0') {
5756 home = lookupvar("HOME");
5758 pw = getpwnam(name);
5763 if (!home || !*home)
5766 startloc = expdest - (char *)stackblock();
5767 strtodest(home, SQSYNTAX, quotes);
5768 recordregion(startloc, expdest - (char *)stackblock(), 0);
5776 * Execute a command inside back quotes. If it's a builtin command, we
5777 * want to save its output in a block obtained from malloc. Otherwise
5778 * we fork off a subprocess and get the output of the command via a pipe.
5779 * Should be called with interrupts off.
5781 struct backcmd { /* result of evalbackcmd */
5782 int fd; /* file descriptor to read from */
5783 int nleft; /* number of chars in buffer */
5784 char *buf; /* buffer */
5785 struct job *jp; /* job structure for command */
5788 /* These forward decls are needed to use "eval" code for backticks handling: */
5789 static uint8_t back_exitstatus; /* exit status of backquoted command */
5790 #define EV_EXIT 01 /* exit after evaluating tree */
5791 static void evaltree(union node *, int);
5793 static void FAST_FUNC
5794 evalbackcmd(union node *n, struct backcmd *result)
5805 saveherefd = herefd;
5813 ash_msg_and_raise_error("pipe call failed");
5814 jp = makejob(/*n,*/ 1);
5815 if (forkshell(jp, n, FORK_NOJOB) == 0) {
5820 copyfd(pip[1], 1 | COPYFD_EXACT);
5824 evaltree(n, EV_EXIT); /* actually evaltreenr... */
5828 result->fd = pip[0];
5831 herefd = saveherefd;
5833 TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n",
5834 result->fd, result->buf, result->nleft, result->jp));
5838 * Expand stuff in backwards quotes.
5841 expbackq(union node *cmd, int quoted, int quotes)
5849 int syntax = quoted ? DQSYNTAX : BASESYNTAX;
5850 struct stackmark smark;
5853 setstackmark(&smark);
5855 startloc = dest - (char *)stackblock();
5857 evalbackcmd(cmd, &in);
5858 popstackmark(&smark);
5865 memtodest(p, i, syntax, quotes);
5869 i = nonblock_safe_read(in.fd, buf, sizeof(buf));
5870 TRACE(("expbackq: read returns %d\n", i));
5879 back_exitstatus = waitforjob(in.jp);
5883 /* Eat all trailing newlines */
5885 for (; dest > (char *)stackblock() && dest[-1] == '\n';)
5890 recordregion(startloc, dest - (char *)stackblock(), 0);
5891 TRACE(("evalbackq: size:%d:'%.*s'\n",
5892 (int)((dest - (char *)stackblock()) - startloc),
5893 (int)((dest - (char *)stackblock()) - startloc),
5894 stackblock() + startloc));
5897 #if ENABLE_SH_MATH_SUPPORT
5899 * Expand arithmetic expression. Backup to start of expression,
5900 * evaluate, place result in (backed up) result, adjust string position.
5913 * This routine is slightly over-complicated for
5914 * efficiency. Next we scan backwards looking for the
5915 * start of arithmetic.
5917 start = stackblock();
5924 while ((unsigned char)*p != CTLARI) {
5928 ash_msg_and_raise_error("missing CTLARI (shouldn't happen)");
5933 esc = esclen(start, p);
5943 removerecordregions(begoff);
5950 rmescapes(p + 2, 0);
5952 len = cvtnum(ash_arith(p + 2));
5955 recordregion(begoff, begoff + len, 0);
5959 /* argstr needs it */
5960 static char *evalvar(char *p, int flags, struct strlist *var_str_list);
5963 * Perform variable and command substitution. If EXP_FULL is set, output CTLESC
5964 * characters to allow for further processing. Otherwise treat
5965 * $@ like $* since no splitting will be performed.
5967 * var_str_list (can be NULL) is a list of "VAR=val" strings which take precedence
5968 * over shell varables. Needed for "A=a B=$A; echo $B" case - we use it
5969 * for correct expansion of "B=$A" word.
5972 argstr(char *p, int flags, struct strlist *var_str_list)
5974 static const char spclchars[] ALIGN1 = {
5982 CTLBACKQ | CTLQUOTE,
5983 #if ENABLE_SH_MATH_SUPPORT
5988 const char *reject = spclchars;
5989 int quotes = flags & (EXP_FULL | EXP_CASE | EXP_REDIR); /* do CTLESC */
5990 int breakall = flags & EXP_WORD;
5995 if (!(flags & EXP_VARTILDE)) {
5997 } else if (flags & EXP_VARTILDE2) {
6002 if (flags & EXP_TILDE) {
6005 flags &= ~EXP_TILDE;
6008 if (*q == CTLESC && (flags & EXP_QWORD))
6011 p = exptilde(p, q, flags);
6014 startloc = expdest - (char *)stackblock();
6018 length += strcspn(p + length, reject);
6022 #if ENABLE_SH_MATH_SUPPORT
6026 /* c == '=' || c == ':' || c == CTLENDARI */
6032 expdest = stack_nputstr(p, length, expdest);
6033 newloc = expdest - (char *)stackblock();
6034 if (breakall && !inquotes && newloc > startloc) {
6035 recordregion(startloc, newloc, 0);
6046 if (flags & EXP_VARTILDE2) {
6050 flags |= EXP_VARTILDE2;
6055 * sort of a hack - expand tildes in variable
6056 * assignments (after the first '=' and after ':'s).
6065 case CTLENDVAR: /* ??? */
6068 /* "$@" syntax adherence hack */
6070 && memcmp(p, dolatstr, 4) == 0
6071 && ( p[4] == CTLQUOTEMARK
6072 || (p[4] == CTLENDVAR && p[5] == CTLQUOTEMARK)
6075 p = evalvar(p + 1, flags, /* var_str_list: */ NULL) + 1;
6078 inquotes = !inquotes;
6091 p = evalvar(p, flags, var_str_list);
6095 case CTLBACKQ|CTLQUOTE:
6096 expbackq(argbackq->n, c, quotes);
6097 argbackq = argbackq->next;
6099 #if ENABLE_SH_MATH_SUPPORT
6112 scanleft(char *startp, char *rmesc, char *rmescend UNUSED_PARAM,
6113 char *pattern, int quotes, int zero)
6122 const char *s = loc2;
6129 match = pmatch(pattern, s);
6134 if (quotes && (unsigned char)*loc == CTLESC)
6143 scanright(char *startp, char *rmesc, char *rmescend,
6144 char *pattern, int quotes, int match_at_start)
6146 #if !ENABLE_ASH_OPTIMIZE_FOR_SIZE
6147 int try2optimize = match_at_start;
6153 /* If we called by "${v/pattern/repl}" or "${v//pattern/repl}":
6154 * startp="escaped_value_of_v" rmesc="raw_value_of_v"
6155 * rmescend=""(ptr to NUL in rmesc) pattern="pattern" quotes=match_at_start=1
6157 * loc starts at NUL at the end of startp, loc2 starts at the end of rmesc,
6158 * and on each iteration they go back two/one char until they reach the beginning.
6159 * We try to find a match in "raw_value_of_v", "raw_value_of_", "raw_value_of" etc.
6161 /* TODO: document in what other circumstances we are called. */
6163 for (loc = pattern - 1, loc2 = rmescend; loc >= startp; loc2--) {
6166 const char *s = loc2;
6167 if (match_at_start) {
6171 match = pmatch(pattern, s);
6172 //bb_error_msg("pmatch(pattern:'%s',s:'%s'):%d", pattern, s, match);
6176 #if !ENABLE_ASH_OPTIMIZE_FOR_SIZE
6178 /* Maybe we can optimize this:
6179 * if pattern ends with unescaped *, we can avoid checking
6180 * shorter strings: if "foo*" doesnt match "raw_value_of_v",
6181 * it wont match truncated "raw_value_of_" strings too.
6183 unsigned plen = strlen(pattern);
6184 /* Does it end with "*"? */
6185 if (plen != 0 && pattern[--plen] == '*') {
6186 /* "xxxx*" is not escaped */
6187 /* "xxx\*" is escaped */
6188 /* "xx\\*" is not escaped */
6189 /* "x\\\*" is escaped */
6191 while (plen != 0 && pattern[--plen] == '\\')
6194 break; /* ends with unescaped "*" */
6202 esc = esclen(startp, loc);
6213 static void varunset(const char *, const char *, const char *, int) NORETURN;
6215 varunset(const char *end, const char *var, const char *umsg, int varflags)
6221 msg = "parameter not set";
6223 if ((unsigned char)*end == CTLENDVAR) {
6224 if (varflags & VSNUL)
6230 ash_msg_and_raise_error("%.*s: %s%s", (int)(end - var - 1), var, msg, tail);
6233 #if ENABLE_ASH_BASH_COMPAT
6235 parse_sub_pattern(char *arg, int varflags)
6237 char *idx, *repl = NULL;
6240 //char *org_arg = arg;
6241 //bb_error_msg("arg:'%s' varflags:%x", arg, varflags);
6248 /* Only the first '/' seen is our separator */
6257 * Example: v='ab\c'; echo ${v/\\b/_\\_\z_}
6258 * The result is a_\_z_c (not a\_\_z_c)!
6260 * Enable debug prints in this function and you'll see:
6261 * ash: arg:'\\b/_\\_z_' varflags:d
6262 * ash: pattern:'\\b' repl:'_\_z_'
6263 * That is, \\b is interpreted as \\b, but \\_ as \_!
6264 * IOW: search pattern and replace string treat backslashes
6265 * differently! That is the reason why we check repl below:
6267 if (c == '\\' && *arg == '\\' && repl && !(varflags & VSQUOTE))
6268 arg++; /* skip both '\', not just first one */
6271 //bb_error_msg("pattern:'%s' repl:'%s'", org_arg, repl);
6275 #endif /* ENABLE_ASH_BASH_COMPAT */
6278 subevalvar(char *p, char *varname, int strloc, int subtype,
6279 int startloc, int varflags, int quotes, struct strlist *var_str_list)
6281 struct nodelist *saveargbackq = argbackq;
6284 char *rmesc, *rmescend;
6286 IF_ASH_BASH_COMPAT(const char *repl = NULL;)
6287 IF_ASH_BASH_COMPAT(int pos, len, orig_len;)
6288 int saveherefd = herefd;
6289 int amount, workloc, resetloc;
6291 char *(*scan)(char*, char*, char*, char*, int, int);
6293 //bb_error_msg("subevalvar(p:'%s',varname:'%s',strloc:%d,subtype:%d,startloc:%d,varflags:%x,quotes:%d",
6294 // p, varname, strloc, subtype, startloc, varflags, quotes);
6297 argstr(p, (subtype != VSASSIGN && subtype != VSQUESTION) ? EXP_CASE : 0,
6299 STPUTC('\0', expdest);
6300 herefd = saveherefd;
6301 argbackq = saveargbackq;
6302 startp = (char *)stackblock() + startloc;
6306 setvar(varname, startp, 0);
6307 amount = startp - expdest;
6308 STADJUST(amount, expdest);
6312 varunset(p, varname, startp, varflags);
6315 #if ENABLE_ASH_BASH_COMPAT
6317 loc = str = stackblock() + strloc;
6318 /* Read POS in ${var:POS:LEN} */
6319 pos = atoi(loc); /* number(loc) errors out on "1:4" */
6320 len = str - startp - 1;
6322 /* *loc != '\0', guaranteed by parser */
6326 /* Adjust the length by the number of escapes */
6327 for (ptr = startp; ptr < (str - 1); ptr++) {
6328 if ((unsigned char)*ptr == CTLESC) {
6336 if (*loc++ == ':') {
6340 /* Skip POS in ${var:POS:LEN} */
6342 while (*loc && *loc != ':') {
6344 * bash complains on: var=qwe; echo ${var:1a:123}
6346 ash_msg_and_raise_error(msg_illnum, str);
6350 if (*loc++ == ':') {
6354 if (pos >= orig_len) {
6358 if (len > (orig_len - pos))
6359 len = orig_len - pos;
6361 for (str = startp; pos; str++, pos--) {
6362 if (quotes && (unsigned char)*str == CTLESC)
6365 for (loc = startp; len; len--) {
6366 if (quotes && (unsigned char)*str == CTLESC)
6371 amount = loc - expdest;
6372 STADJUST(amount, expdest);
6377 resetloc = expdest - (char *)stackblock();
6379 /* We'll comeback here if we grow the stack while handling
6380 * a VSREPLACE or VSREPLACEALL, since our pointers into the
6381 * stack will need rebasing, and we'll need to remove our work
6384 IF_ASH_BASH_COMPAT(restart:)
6386 amount = expdest - ((char *)stackblock() + resetloc);
6387 STADJUST(-amount, expdest);
6388 startp = (char *)stackblock() + startloc;
6391 rmescend = (char *)stackblock() + strloc;
6393 rmesc = rmescapes(startp, RMESCAPE_ALLOC | RMESCAPE_GROW);
6394 if (rmesc != startp) {
6396 startp = (char *)stackblock() + startloc;
6400 str = (char *)stackblock() + strloc;
6401 preglob(str, varflags & VSQUOTE, 0);
6402 workloc = expdest - (char *)stackblock();
6404 #if ENABLE_ASH_BASH_COMPAT
6405 if (subtype == VSREPLACE || subtype == VSREPLACEALL) {
6409 repl = parse_sub_pattern(str, varflags);
6410 //bb_error_msg("repl:'%s'", repl);
6415 /* If there's no pattern to match, return the expansion unmolested */
6424 loc = scanright(idx, rmesc, rmescend, str, quotes, 1);
6425 //bb_error_msg("scanright('%s'):'%s'", str, loc);
6427 /* No match, advance */
6428 char *restart_detect = stackblock();
6430 STPUTC(*idx, expdest);
6431 if (quotes && (unsigned char)*idx == CTLESC) {
6434 STPUTC(*idx, expdest);
6436 if (stackblock() != restart_detect)
6441 /* continue; - prone to quadratic behavior, smarter code: */
6444 if (str[0] == '*') {
6445 /* Pattern is "*foo". If "*foo" does not match "long_string",
6446 * it would never match "ong_string" etc, no point in trying.
6453 if (subtype == VSREPLACEALL) {
6455 if (quotes && (unsigned char)*idx == CTLESC)
6464 //bb_error_msg("repl:'%s'", repl);
6465 for (loc = (char*)repl; *loc; loc++) {
6466 char *restart_detect = stackblock();
6467 if (quotes && *loc == '\\') {
6468 STPUTC(CTLESC, expdest);
6471 STPUTC(*loc, expdest);
6472 if (stackblock() != restart_detect)
6477 if (subtype == VSREPLACE) {
6478 //bb_error_msg("tail:'%s', quotes:%x", idx, quotes);
6480 char *restart_detect = stackblock();
6481 STPUTC(*idx, expdest);
6482 if (stackblock() != restart_detect)
6491 /* We've put the replaced text into a buffer at workloc, now
6492 * move it to the right place and adjust the stack.
6494 STPUTC('\0', expdest);
6495 startp = (char *)stackblock() + startloc;
6496 memmove(startp, (char *)stackblock() + workloc, len + 1);
6497 //bb_error_msg("startp:'%s'", startp);
6498 amount = expdest - (startp + len);
6499 STADJUST(-amount, expdest);
6502 #endif /* ENABLE_ASH_BASH_COMPAT */
6504 subtype -= VSTRIMRIGHT;
6506 if (subtype < 0 || subtype > 7)
6509 /* zero = (subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX) */
6510 zero = subtype >> 1;
6511 /* VSTRIMLEFT/VSTRIMRIGHTMAX -> scanleft */
6512 scan = (subtype & 1) ^ zero ? scanleft : scanright;
6514 loc = scan(startp, rmesc, rmescend, str, quotes, zero);
6517 memmove(startp, loc, str - loc);
6518 loc = startp + (str - loc) - 1;
6521 amount = loc - expdest;
6522 STADJUST(amount, expdest);
6528 * Add the value of a specialized variable to the stack string.
6529 * name parameter (examples):
6530 * ash -c 'echo $1' name:'1='
6531 * ash -c 'echo $qwe' name:'qwe='
6532 * ash -c 'echo $$' name:'$='
6533 * ash -c 'echo ${$}' name:'$='
6534 * ash -c 'echo ${$##q}' name:'$=q'
6535 * ash -c 'echo ${#$}' name:'$='
6536 * note: examples with bad shell syntax:
6537 * ash -c 'echo ${#$1}' name:'$=1'
6538 * ash -c 'echo ${#1#}' name:'1=#'
6540 static NOINLINE ssize_t
6541 varvalue(char *name, int varflags, int flags, struct strlist *var_str_list)
6548 int subtype = varflags & VSTYPE;
6549 int quotes = flags & (EXP_FULL | EXP_CASE | EXP_REDIR);
6550 int quoted = varflags & VSQUOTE;
6551 int syntax = quoted ? DQSYNTAX : BASESYNTAX;
6561 num = shellparam.nparam;
6569 goto check_1char_name;
6571 expdest = makestrspace(NOPTS, expdest);
6572 for (i = NOPTS - 1; i >= 0; i--) {
6574 USTPUTC(optletters(i), expdest);
6580 /* handles cases similar to ${#$1} */
6581 if (name[2] != '\0')
6582 raise_error_syntax("bad substitution");
6589 if (quoted && (flags & EXP_FULL)) {
6590 /* note: this is not meant as PEOF value */
6591 sep = 1 << CHAR_BIT;
6596 sep = ifsset() ? (unsigned char)(ifsval()[0]) : ' ';
6597 i = SIT(sep, syntax);
6598 if (quotes && (i == CCTL || i == CBACK))
6604 while ((p = *ap++) != NULL) {
6607 partlen = strlen(p);
6610 if (!(subtype == VSPLUS || subtype == VSLENGTH))
6611 memtodest(p, partlen, syntax, quotes);
6617 if (subtype == VSPLUS || subtype == VSLENGTH) {
6623 /* note: may put NUL despite sep != 0
6624 * (see sep = 1 << CHAR_BIT above) */
6630 } /* case '@' and '*' */
6641 num = atoi(name); /* number(name) fails on ${N#str} etc */
6642 if (num < 0 || num > shellparam.nparam)
6644 p = num ? shellparam.p[num - 1] : arg0;
6647 /* NB: name has form "VAR=..." */
6649 /* "A=a B=$A" case: var_str_list is a list of "A=a" strings
6650 * which should be considered before we check variables. */
6652 unsigned name_len = (strchrnul(name, '=') - name) + 1;
6656 str = var_str_list->text;
6657 eq = strchr(str, '=');
6658 if (!eq) /* stop at first non-assignment */
6661 if (name_len == (unsigned)(eq - str)
6662 && strncmp(str, name, name_len) == 0
6665 /* goto value; - WRONG! */
6666 /* think "A=1 A=2 B=$A" */
6668 var_str_list = var_str_list->next;
6669 } while (var_str_list);
6673 p = lookupvar(name);
6679 if (!(subtype == VSPLUS || subtype == VSLENGTH))
6680 memtodest(p, len, syntax, quotes);
6684 if (subtype == VSPLUS || subtype == VSLENGTH)
6685 STADJUST(-len, expdest);
6690 * Expand a variable, and return a pointer to the next character in the
6694 evalvar(char *p, int flags, struct strlist *var_str_list)
6705 varflags = (unsigned char) *p++;
6706 subtype = varflags & VSTYPE;
6707 quoted = varflags & VSQUOTE;
6709 easy = (!quoted || (*var == '@' && shellparam.nparam));
6710 startloc = expdest - (char *)stackblock();
6711 p = strchr(p, '=') + 1; //TODO: use var_end(p)?
6714 varlen = varvalue(var, varflags, flags, var_str_list);
6715 if (varflags & VSNUL)
6718 if (subtype == VSPLUS) {
6719 varlen = -1 - varlen;
6723 if (subtype == VSMINUS) {
6727 p, flags | EXP_TILDE |
6728 (quoted ? EXP_QWORD : EXP_WORD),
6738 if (subtype == VSASSIGN || subtype == VSQUESTION) {
6740 if (subevalvar(p, var, /* strloc: */ 0,
6741 subtype, startloc, varflags,
6747 * Remove any recorded regions beyond
6750 removerecordregions(startloc);
6760 if (varlen < 0 && uflag)
6761 varunset(p, var, 0, 0);
6763 if (subtype == VSLENGTH) {
6764 cvtnum(varlen > 0 ? varlen : 0);
6768 if (subtype == VSNORMAL) {
6779 case VSTRIMRIGHTMAX:
6780 #if ENABLE_ASH_BASH_COMPAT
6793 * Terminate the string and start recording the pattern
6796 STPUTC('\0', expdest);
6797 patloc = expdest - (char *)stackblock();
6798 if (NULL == subevalvar(p, /* varname: */ NULL, patloc, subtype,
6800 //TODO: | EXP_REDIR too? All other such places do it too
6801 /* quotes: */ flags & (EXP_FULL | EXP_CASE),
6804 int amount = expdest - (
6805 (char *)stackblock() + patloc - 1
6807 STADJUST(-amount, expdest);
6809 /* Remove any recorded regions beyond start of variable */
6810 removerecordregions(startloc);
6812 recordregion(startloc, expdest - (char *)stackblock(), quoted);
6816 if (subtype != VSNORMAL) { /* skip to end of alternative */
6819 unsigned char c = *p++;
6822 else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) {
6824 argbackq = argbackq->next;
6825 } else if (c == CTLVAR) {
6826 if ((*p++ & VSTYPE) != VSNORMAL)
6828 } else if (c == CTLENDVAR) {
6838 * Break the argument string into pieces based upon IFS and add the
6839 * strings to the argument list. The regions of the string to be
6840 * searched for IFS characters have been stored by recordregion.
6843 ifsbreakup(char *string, struct arglist *arglist)
6845 struct ifsregion *ifsp;
6850 const char *ifs, *realifs;
6855 if (ifslastp != NULL) {
6858 realifs = ifsset() ? ifsval() : defifs;
6861 p = string + ifsp->begoff;
6862 nulonly = ifsp->nulonly;
6863 ifs = nulonly ? nullstr : realifs;
6865 while (p < string + ifsp->endoff) {
6867 if ((unsigned char)*p == CTLESC)
6869 if (!strchr(ifs, *p)) {
6874 ifsspc = (strchr(defifs, *p) != NULL);
6875 /* Ignore IFS whitespace at start */
6876 if (q == start && ifsspc) {
6882 sp = stzalloc(sizeof(*sp));
6884 *arglist->lastp = sp;
6885 arglist->lastp = &sp->next;
6889 if (p >= string + ifsp->endoff) {
6893 if ((unsigned char)*p == CTLESC)
6895 if (strchr(ifs, *p) == NULL) {
6899 if (strchr(defifs, *p) == NULL) {
6914 } while (ifsp != NULL);
6923 sp = stzalloc(sizeof(*sp));
6925 *arglist->lastp = sp;
6926 arglist->lastp = &sp->next;
6932 struct ifsregion *p;
6937 struct ifsregion *ifsp;
6943 ifsfirst.next = NULL;
6948 * Add a file name to the list.
6951 addfname(const char *name)
6955 sp = stzalloc(sizeof(*sp));
6956 sp->text = ststrdup(name);
6958 exparg.lastp = &sp->next;
6962 * Do metacharacter (i.e. *, ?, [...]) expansion.
6965 expmeta(char *expdir, char *enddir, char *name)
6980 for (p = name; *p; p++) {
6981 if (*p == '*' || *p == '?')
6983 else if (*p == '[') {
6990 if (*q == '/' || *q == '\0')
6997 } else if (*p == '\\')
6999 else if (*p == '/') {
7006 if (metaflag == 0) { /* we've reached the end of the file name */
7007 if (enddir != expdir)
7015 if (metaflag == 0 || lstat(expdir, &statb) >= 0)
7026 } while (p < start);
7028 if (enddir == expdir) {
7030 } else if (enddir == expdir + 1 && *expdir == '/') {
7039 if (enddir != expdir)
7041 if (*endname == 0) {
7053 while (!pending_int && (dp = readdir(dirp)) != NULL) {
7054 if (dp->d_name[0] == '.' && !matchdot)
7056 if (pmatch(start, dp->d_name)) {
7058 strcpy(enddir, dp->d_name);
7061 for (p = enddir, cp = dp->d_name; (*p++ = *cp++) != '\0';)
7064 expmeta(expdir, p, endname);
7073 static struct strlist *
7074 msort(struct strlist *list, int len)
7076 struct strlist *p, *q = NULL;
7077 struct strlist **lpp;
7085 for (n = half; --n >= 0;) {
7089 q->next = NULL; /* terminate first half of list */
7090 q = msort(list, half); /* sort first half of list */
7091 p = msort(p, len - half); /* sort second half */
7094 #if ENABLE_LOCALE_SUPPORT
7095 if (strcoll(p->text, q->text) < 0)
7097 if (strcmp(p->text, q->text) < 0)
7121 * Sort the results of file name expansion. It calculates the number of
7122 * strings to sort and then calls msort (short for merge sort) to do the
7125 static struct strlist *
7126 expsort(struct strlist *str)
7132 for (sp = str; sp; sp = sp->next)
7134 return msort(str, len);
7138 expandmeta(struct strlist *str /*, int flag*/)
7140 static const char metachars[] ALIGN1 = {
7143 /* TODO - EXP_REDIR */
7147 struct strlist **savelastp;
7153 if (!strpbrk(str->text, metachars))
7155 savelastp = exparg.lastp;
7158 p = preglob(str->text, 0, RMESCAPE_ALLOC | RMESCAPE_HEAP);
7160 int i = strlen(str->text);
7161 expdir = ckmalloc(i < 2048 ? 2048 : i); /* XXX */
7163 expmeta(expdir, expdir, p);
7168 if (exparg.lastp == savelastp) {
7173 *exparg.lastp = str;
7174 rmescapes(str->text, 0);
7175 exparg.lastp = &str->next;
7177 *exparg.lastp = NULL;
7178 *savelastp = sp = expsort(*savelastp);
7179 while (sp->next != NULL)
7181 exparg.lastp = &sp->next;
7188 * Perform variable substitution and command substitution on an argument,
7189 * placing the resulting list of arguments in arglist. If EXP_FULL is true,
7190 * perform splitting and file name expansion. When arglist is NULL, perform
7191 * here document expansion.
7194 expandarg(union node *arg, struct arglist *arglist, int flag)
7199 argbackq = arg->narg.backquote;
7200 STARTSTACKSTR(expdest);
7201 ifsfirst.next = NULL;
7203 argstr(arg->narg.text, flag,
7204 /* var_str_list: */ arglist ? arglist->list : NULL);
7205 p = _STPUTC('\0', expdest);
7207 if (arglist == NULL) {
7208 return; /* here document expanded */
7210 p = grabstackstr(p);
7211 exparg.lastp = &exparg.list;
7215 if (flag & EXP_FULL) {
7216 ifsbreakup(p, &exparg);
7217 *exparg.lastp = NULL;
7218 exparg.lastp = &exparg.list;
7219 expandmeta(exparg.list /*, flag*/);
7221 if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */
7223 sp = stzalloc(sizeof(*sp));
7226 exparg.lastp = &sp->next;
7230 *exparg.lastp = NULL;
7232 *arglist->lastp = exparg.list;
7233 arglist->lastp = exparg.lastp;
7238 * Expand shell variables and backquotes inside a here document.
7241 expandhere(union node *arg, int fd)
7244 expandarg(arg, (struct arglist *)NULL, 0);
7245 full_write(fd, stackblock(), expdest - (char *)stackblock());
7249 * Returns true if the pattern matches the string.
7252 patmatch(char *pattern, const char *string)
7254 return pmatch(preglob(pattern, 0, 0), string);
7258 * See if a pattern matches in a case statement.
7261 casematch(union node *pattern, char *val)
7263 struct stackmark smark;
7266 setstackmark(&smark);
7267 argbackq = pattern->narg.backquote;
7268 STARTSTACKSTR(expdest);
7270 argstr(pattern->narg.text, EXP_TILDE | EXP_CASE,
7271 /* var_str_list: */ NULL);
7272 STACKSTRNUL(expdest);
7273 result = patmatch(stackblock(), val);
7274 popstackmark(&smark);
7279 /* ============ find_command */
7283 int (*builtin)(int, char **) FAST_FUNC;
7284 /* unsigned flags; */
7286 #define IS_BUILTIN_SPECIAL(b) ((b)->name[0] & 1)
7287 /* "regular" builtins always take precedence over commands,
7288 * regardless of PATH=....%builtin... position */
7289 #define IS_BUILTIN_REGULAR(b) ((b)->name[0] & 2)
7290 #define IS_BUILTIN_ASSIGN(b) ((b)->name[0] & 4)
7293 smallint cmdtype; /* CMDxxx */
7296 /* index >= 0 for commands without path (slashes) */
7297 /* (TODO: what exactly does the value mean? PATH position?) */
7298 /* index == -1 for commands with slashes */
7299 /* index == (-2 - applet_no) for NOFORK applets */
7300 const struct builtincmd *cmd;
7301 struct funcnode *func;
7304 /* values of cmdtype */
7305 #define CMDUNKNOWN -1 /* no entry in table for command */
7306 #define CMDNORMAL 0 /* command is an executable program */
7307 #define CMDFUNCTION 1 /* command is a shell function */
7308 #define CMDBUILTIN 2 /* command is a shell builtin */
7310 /* action to find_command() */
7311 #define DO_ERR 0x01 /* prints errors */
7312 #define DO_ABS 0x02 /* checks absolute paths */
7313 #define DO_NOFUNC 0x04 /* don't return shell functions, for command */
7314 #define DO_ALTPATH 0x08 /* using alternate path */
7315 #define DO_ALTBLTIN 0x20 /* %builtin in alt. path */
7317 static void find_command(char *, struct cmdentry *, int, const char *);
7320 /* ============ Hashing commands */
7323 * When commands are first encountered, they are entered in a hash table.
7324 * This ensures that a full path search will not have to be done for them
7325 * on each invocation.
7327 * We should investigate converting to a linear search, even though that
7328 * would make the command name "hash" a misnomer.
7332 struct tblentry *next; /* next entry in hash chain */
7333 union param param; /* definition of builtin function */
7334 smallint cmdtype; /* CMDxxx */
7335 char rehash; /* if set, cd done since entry created */
7336 char cmdname[1]; /* name of command */
7339 static struct tblentry **cmdtable;
7340 #define INIT_G_cmdtable() do { \
7341 cmdtable = xzalloc(CMDTABLESIZE * sizeof(cmdtable[0])); \
7344 static int builtinloc = -1; /* index in path of %builtin, or -1 */
7348 tryexec(IF_FEATURE_SH_STANDALONE(int applet_no,) char *cmd, char **argv, char **envp)
7352 #if ENABLE_FEATURE_SH_STANDALONE
7353 if (applet_no >= 0) {
7354 if (APPLET_IS_NOEXEC(applet_no)) {
7358 run_applet_no_and_exit(applet_no, argv);
7360 /* re-exec ourselves with the new arguments */
7361 execve(bb_busybox_exec_path, argv, envp);
7362 /* If they called chroot or otherwise made the binary no longer
7363 * executable, fall through */
7370 execve(cmd, argv, envp);
7371 } while (errno == EINTR);
7373 execve(cmd, argv, envp);
7379 if (errno == ENOEXEC) {
7383 for (ap = argv; *ap; ap++)
7385 ap = new = ckmalloc((ap - argv + 2) * sizeof(ap[0]));
7387 ap[0] = cmd = (char *)DEFAULT_SHELL;
7390 while ((*ap++ = *argv++) != NULL)
7399 * Exec a program. Never returns. If you change this routine, you may
7400 * have to change the find_command routine as well.
7402 static void shellexec(char **, const char *, int) NORETURN;
7404 shellexec(char **argv, const char *path, int idx)
7410 #if ENABLE_FEATURE_SH_STANDALONE
7414 clearredir(/*drop:*/ 1);
7415 envp = listvars(VEXPORT, VUNSET, /*end:*/ NULL);
7416 if (strchr(argv[0], '/') != NULL
7417 #if ENABLE_FEATURE_SH_STANDALONE
7418 || (applet_no = find_applet_by_name(argv[0])) >= 0
7421 tryexec(IF_FEATURE_SH_STANDALONE(applet_no,) argv[0], argv, envp);
7425 while ((cmdname = path_advance(&path, argv[0])) != NULL) {
7426 if (--idx < 0 && pathopt == NULL) {
7427 tryexec(IF_FEATURE_SH_STANDALONE(-1,) cmdname, argv, envp);
7428 if (errno != ENOENT && errno != ENOTDIR)
7435 /* Map to POSIX errors */
7447 exitstatus = exerrno;
7448 TRACE(("shellexec failed for %s, errno %d, suppress_int %d\n",
7449 argv[0], e, suppress_int));
7450 ash_msg_and_raise(EXEXEC, "%s: %s", argv[0], errmsg(e, "not found"));
7455 printentry(struct tblentry *cmdp)
7461 idx = cmdp->param.index;
7464 name = path_advance(&path, cmdp->cmdname);
7466 } while (--idx >= 0);
7467 out1fmt("%s%s\n", name, (cmdp->rehash ? "*" : nullstr));
7471 * Clear out command entries. The argument specifies the first entry in
7472 * PATH which has changed.
7475 clearcmdentry(int firstchange)
7477 struct tblentry **tblp;
7478 struct tblentry **pp;
7479 struct tblentry *cmdp;
7482 for (tblp = cmdtable; tblp < &cmdtable[CMDTABLESIZE]; tblp++) {
7484 while ((cmdp = *pp) != NULL) {
7485 if ((cmdp->cmdtype == CMDNORMAL &&
7486 cmdp->param.index >= firstchange)
7487 || (cmdp->cmdtype == CMDBUILTIN &&
7488 builtinloc >= firstchange)
7501 * Locate a command in the command hash table. If "add" is nonzero,
7502 * add the command to the table if it is not already present. The
7503 * variable "lastcmdentry" is set to point to the address of the link
7504 * pointing to the entry, so that delete_cmd_entry can delete the
7507 * Interrupts must be off if called with add != 0.
7509 static struct tblentry **lastcmdentry;
7511 static struct tblentry *
7512 cmdlookup(const char *name, int add)
7514 unsigned int hashval;
7516 struct tblentry *cmdp;
7517 struct tblentry **pp;
7520 hashval = (unsigned char)*p << 4;
7522 hashval += (unsigned char)*p++;
7524 pp = &cmdtable[hashval % CMDTABLESIZE];
7525 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7526 if (strcmp(cmdp->cmdname, name) == 0)
7530 if (add && cmdp == NULL) {
7531 cmdp = *pp = ckzalloc(sizeof(struct tblentry)
7533 /* + 1 - already done because
7534 * tblentry::cmdname is char[1] */);
7535 /*cmdp->next = NULL; - ckzalloc did it */
7536 cmdp->cmdtype = CMDUNKNOWN;
7537 strcpy(cmdp->cmdname, name);
7544 * Delete the command entry returned on the last lookup.
7547 delete_cmd_entry(void)
7549 struct tblentry *cmdp;
7552 cmdp = *lastcmdentry;
7553 *lastcmdentry = cmdp->next;
7554 if (cmdp->cmdtype == CMDFUNCTION)
7555 freefunc(cmdp->param.func);
7561 * Add a new command entry, replacing any existing command entry for
7562 * the same name - except special builtins.
7565 addcmdentry(char *name, struct cmdentry *entry)
7567 struct tblentry *cmdp;
7569 cmdp = cmdlookup(name, 1);
7570 if (cmdp->cmdtype == CMDFUNCTION) {
7571 freefunc(cmdp->param.func);
7573 cmdp->cmdtype = entry->cmdtype;
7574 cmdp->param = entry->u;
7578 static int FAST_FUNC
7579 hashcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
7581 struct tblentry **pp;
7582 struct tblentry *cmdp;
7584 struct cmdentry entry;
7587 if (nextopt("r") != '\0') {
7592 if (*argptr == NULL) {
7593 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
7594 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7595 if (cmdp->cmdtype == CMDNORMAL)
7603 while ((name = *argptr) != NULL) {
7604 cmdp = cmdlookup(name, 0);
7606 && (cmdp->cmdtype == CMDNORMAL
7607 || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))
7611 find_command(name, &entry, DO_ERR, pathval());
7612 if (entry.cmdtype == CMDUNKNOWN)
7620 * Called when a cd is done. Marks all commands so the next time they
7621 * are executed they will be rehashed.
7626 struct tblentry **pp;
7627 struct tblentry *cmdp;
7629 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
7630 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7631 if (cmdp->cmdtype == CMDNORMAL
7632 || (cmdp->cmdtype == CMDBUILTIN
7633 && !IS_BUILTIN_REGULAR(cmdp->param.cmd)
7643 * Fix command hash table when PATH changed.
7644 * Called before PATH is changed. The argument is the new value of PATH;
7645 * pathval() still returns the old value at this point.
7646 * Called with interrupts off.
7648 static void FAST_FUNC
7649 changepath(const char *new)
7657 firstchange = 9999; /* assume no change */
7663 if ((*old == '\0' && *new == ':')
7664 || (*old == ':' && *new == '\0')
7668 old = new; /* ignore subsequent differences */
7672 if (*new == '%' && idx_bltin < 0 && prefix(new + 1, "builtin"))
7679 if (builtinloc < 0 && idx_bltin >= 0)
7680 builtinloc = idx_bltin; /* zap builtins */
7681 if (builtinloc >= 0 && idx_bltin < 0)
7683 clearcmdentry(firstchange);
7684 builtinloc = idx_bltin;
7699 #define TENDBQUOTE 12
7716 typedef smallint token_id_t;
7718 /* first char is indicating which tokens mark the end of a list */
7719 static const char *const tokname_array[] = {
7733 #define KWDOFFSET 13
7734 /* the following are keywords */
7753 /* Wrapper around strcmp for qsort/bsearch/... */
7755 pstrcmp(const void *a, const void *b)
7757 return strcmp((char*) a, (*(char**) b) + 1);
7760 static const char *const *
7761 findkwd(const char *s)
7763 return bsearch(s, tokname_array + KWDOFFSET,
7764 ARRAY_SIZE(tokname_array) - KWDOFFSET,
7765 sizeof(tokname_array[0]), pstrcmp);
7769 * Locate and print what a word is...
7772 describe_command(char *command, int describe_command_verbose)
7774 struct cmdentry entry;
7775 struct tblentry *cmdp;
7776 #if ENABLE_ASH_ALIAS
7777 const struct alias *ap;
7779 const char *path = pathval();
7781 if (describe_command_verbose) {
7785 /* First look at the keywords */
7786 if (findkwd(command)) {
7787 out1str(describe_command_verbose ? " is a shell keyword" : command);
7791 #if ENABLE_ASH_ALIAS
7792 /* Then look at the aliases */
7793 ap = lookupalias(command, 0);
7795 if (!describe_command_verbose) {
7800 out1fmt(" is an alias for %s", ap->val);
7804 /* Then check if it is a tracked alias */
7805 cmdp = cmdlookup(command, 0);
7807 entry.cmdtype = cmdp->cmdtype;
7808 entry.u = cmdp->param;
7810 /* Finally use brute force */
7811 find_command(command, &entry, DO_ABS, path);
7814 switch (entry.cmdtype) {
7816 int j = entry.u.index;
7822 p = path_advance(&path, command);
7826 if (describe_command_verbose) {
7828 (cmdp ? " a tracked alias for" : nullstr), p
7837 if (describe_command_verbose) {
7838 out1str(" is a shell function");
7845 if (describe_command_verbose) {
7846 out1fmt(" is a %sshell builtin",
7847 IS_BUILTIN_SPECIAL(entry.u.cmd) ?
7848 "special " : nullstr
7856 if (describe_command_verbose) {
7857 out1str(": not found\n");
7866 static int FAST_FUNC
7867 typecmd(int argc UNUSED_PARAM, char **argv)
7873 /* type -p ... ? (we don't bother checking for 'p') */
7874 if (argv[1] && argv[1][0] == '-') {
7879 err |= describe_command(argv[i++], verbose);
7884 #if ENABLE_ASH_CMDCMD
7885 static int FAST_FUNC
7886 commandcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
7894 while ((c = nextopt("pvV")) != '\0')
7896 verify |= VERIFY_VERBOSE;
7898 verify |= VERIFY_BRIEF;
7903 /* Mimic bash: just "command -v" doesn't complain, it's a nop */
7904 if (verify && (*argptr != NULL)) {
7905 return describe_command(*argptr, verify - VERIFY_BRIEF);
7913 /* ============ eval.c */
7915 static int funcblocksize; /* size of structures in function */
7916 static int funcstringsize; /* size of strings in node */
7917 static void *funcblock; /* block to allocate function from */
7918 static char *funcstring; /* block to allocate strings from */
7920 /* flags in argument to evaltree */
7921 #define EV_EXIT 01 /* exit after evaluating tree */
7922 #define EV_TESTED 02 /* exit status is checked; ignore -e flag */
7923 #define EV_BACKCMD 04 /* command executing within back quotes */
7925 static const uint8_t nodesize[N_NUMBER] = {
7926 [NCMD ] = SHELL_ALIGN(sizeof(struct ncmd)),
7927 [NPIPE ] = SHELL_ALIGN(sizeof(struct npipe)),
7928 [NREDIR ] = SHELL_ALIGN(sizeof(struct nredir)),
7929 [NBACKGND ] = SHELL_ALIGN(sizeof(struct nredir)),
7930 [NSUBSHELL] = SHELL_ALIGN(sizeof(struct nredir)),
7931 [NAND ] = SHELL_ALIGN(sizeof(struct nbinary)),
7932 [NOR ] = SHELL_ALIGN(sizeof(struct nbinary)),
7933 [NSEMI ] = SHELL_ALIGN(sizeof(struct nbinary)),
7934 [NIF ] = SHELL_ALIGN(sizeof(struct nif)),
7935 [NWHILE ] = SHELL_ALIGN(sizeof(struct nbinary)),
7936 [NUNTIL ] = SHELL_ALIGN(sizeof(struct nbinary)),
7937 [NFOR ] = SHELL_ALIGN(sizeof(struct nfor)),
7938 [NCASE ] = SHELL_ALIGN(sizeof(struct ncase)),
7939 [NCLIST ] = SHELL_ALIGN(sizeof(struct nclist)),
7940 [NDEFUN ] = SHELL_ALIGN(sizeof(struct narg)),
7941 [NARG ] = SHELL_ALIGN(sizeof(struct narg)),
7942 [NTO ] = SHELL_ALIGN(sizeof(struct nfile)),
7943 #if ENABLE_ASH_BASH_COMPAT
7944 [NTO2 ] = SHELL_ALIGN(sizeof(struct nfile)),
7946 [NCLOBBER ] = SHELL_ALIGN(sizeof(struct nfile)),
7947 [NFROM ] = SHELL_ALIGN(sizeof(struct nfile)),
7948 [NFROMTO ] = SHELL_ALIGN(sizeof(struct nfile)),
7949 [NAPPEND ] = SHELL_ALIGN(sizeof(struct nfile)),
7950 [NTOFD ] = SHELL_ALIGN(sizeof(struct ndup)),
7951 [NFROMFD ] = SHELL_ALIGN(sizeof(struct ndup)),
7952 [NHERE ] = SHELL_ALIGN(sizeof(struct nhere)),
7953 [NXHERE ] = SHELL_ALIGN(sizeof(struct nhere)),
7954 [NNOT ] = SHELL_ALIGN(sizeof(struct nnot)),
7957 static void calcsize(union node *n);
7960 sizenodelist(struct nodelist *lp)
7963 funcblocksize += SHELL_ALIGN(sizeof(struct nodelist));
7970 calcsize(union node *n)
7974 funcblocksize += nodesize[n->type];
7977 calcsize(n->ncmd.redirect);
7978 calcsize(n->ncmd.args);
7979 calcsize(n->ncmd.assign);
7982 sizenodelist(n->npipe.cmdlist);
7987 calcsize(n->nredir.redirect);
7988 calcsize(n->nredir.n);
7995 calcsize(n->nbinary.ch2);
7996 calcsize(n->nbinary.ch1);
7999 calcsize(n->nif.elsepart);
8000 calcsize(n->nif.ifpart);
8001 calcsize(n->nif.test);
8004 funcstringsize += strlen(n->nfor.var) + 1;
8005 calcsize(n->nfor.body);
8006 calcsize(n->nfor.args);
8009 calcsize(n->ncase.cases);
8010 calcsize(n->ncase.expr);
8013 calcsize(n->nclist.body);
8014 calcsize(n->nclist.pattern);
8015 calcsize(n->nclist.next);
8019 sizenodelist(n->narg.backquote);
8020 funcstringsize += strlen(n->narg.text) + 1;
8021 calcsize(n->narg.next);
8024 #if ENABLE_ASH_BASH_COMPAT
8031 calcsize(n->nfile.fname);
8032 calcsize(n->nfile.next);
8036 calcsize(n->ndup.vname);
8037 calcsize(n->ndup.next);
8041 calcsize(n->nhere.doc);
8042 calcsize(n->nhere.next);
8045 calcsize(n->nnot.com);
8051 nodeckstrdup(char *s)
8053 char *rtn = funcstring;
8055 strcpy(funcstring, s);
8056 funcstring += strlen(s) + 1;
8060 static union node *copynode(union node *);
8062 static struct nodelist *
8063 copynodelist(struct nodelist *lp)
8065 struct nodelist *start;
8066 struct nodelist **lpp;
8071 funcblock = (char *) funcblock + SHELL_ALIGN(sizeof(struct nodelist));
8072 (*lpp)->n = copynode(lp->n);
8074 lpp = &(*lpp)->next;
8081 copynode(union node *n)
8088 funcblock = (char *) funcblock + nodesize[n->type];
8092 new->ncmd.redirect = copynode(n->ncmd.redirect);
8093 new->ncmd.args = copynode(n->ncmd.args);
8094 new->ncmd.assign = copynode(n->ncmd.assign);
8097 new->npipe.cmdlist = copynodelist(n->npipe.cmdlist);
8098 new->npipe.pipe_backgnd = n->npipe.pipe_backgnd;
8103 new->nredir.redirect = copynode(n->nredir.redirect);
8104 new->nredir.n = copynode(n->nredir.n);
8111 new->nbinary.ch2 = copynode(n->nbinary.ch2);
8112 new->nbinary.ch1 = copynode(n->nbinary.ch1);
8115 new->nif.elsepart = copynode(n->nif.elsepart);
8116 new->nif.ifpart = copynode(n->nif.ifpart);
8117 new->nif.test = copynode(n->nif.test);
8120 new->nfor.var = nodeckstrdup(n->nfor.var);
8121 new->nfor.body = copynode(n->nfor.body);
8122 new->nfor.args = copynode(n->nfor.args);
8125 new->ncase.cases = copynode(n->ncase.cases);
8126 new->ncase.expr = copynode(n->ncase.expr);
8129 new->nclist.body = copynode(n->nclist.body);
8130 new->nclist.pattern = copynode(n->nclist.pattern);
8131 new->nclist.next = copynode(n->nclist.next);
8135 new->narg.backquote = copynodelist(n->narg.backquote);
8136 new->narg.text = nodeckstrdup(n->narg.text);
8137 new->narg.next = copynode(n->narg.next);
8140 #if ENABLE_ASH_BASH_COMPAT
8147 new->nfile.fname = copynode(n->nfile.fname);
8148 new->nfile.fd = n->nfile.fd;
8149 new->nfile.next = copynode(n->nfile.next);
8153 new->ndup.vname = copynode(n->ndup.vname);
8154 new->ndup.dupfd = n->ndup.dupfd;
8155 new->ndup.fd = n->ndup.fd;
8156 new->ndup.next = copynode(n->ndup.next);
8160 new->nhere.doc = copynode(n->nhere.doc);
8161 new->nhere.fd = n->nhere.fd;
8162 new->nhere.next = copynode(n->nhere.next);
8165 new->nnot.com = copynode(n->nnot.com);
8168 new->type = n->type;
8173 * Make a copy of a parse tree.
8175 static struct funcnode *
8176 copyfunc(union node *n)
8181 funcblocksize = offsetof(struct funcnode, n);
8184 blocksize = funcblocksize;
8185 f = ckmalloc(blocksize + funcstringsize);
8186 funcblock = (char *) f + offsetof(struct funcnode, n);
8187 funcstring = (char *) f + blocksize;
8194 * Define a shell function.
8197 defun(char *name, union node *func)
8199 struct cmdentry entry;
8202 entry.cmdtype = CMDFUNCTION;
8203 entry.u.func = copyfunc(func);
8204 addcmdentry(name, &entry);
8208 /* Reasons for skipping commands (see comment on breakcmd routine) */
8209 #define SKIPBREAK (1 << 0)
8210 #define SKIPCONT (1 << 1)
8211 #define SKIPFUNC (1 << 2)
8212 #define SKIPFILE (1 << 3)
8213 #define SKIPEVAL (1 << 4)
8214 static smallint evalskip; /* set to SKIPxxx if we are skipping commands */
8215 static int skipcount; /* number of levels to skip */
8216 static int funcnest; /* depth of function calls */
8217 static int loopnest; /* current loop nesting level */
8219 /* Forward decl way out to parsing code - dotrap needs it */
8220 static int evalstring(char *s, int mask);
8222 /* Called to execute a trap.
8223 * Single callsite - at the end of evaltree().
8224 * If we return non-zero, exaltree raises EXEXIT exception.
8226 * Perhaps we should avoid entering new trap handlers
8227 * while we are executing a trap handler. [is it a TODO?]
8236 savestatus = exitstatus;
8240 TRACE(("dotrap entered\n"));
8241 for (sig = 1, g = gotsig; sig < NSIG; sig++, g++) {
8248 /* non-trapped SIGINT is handled separately by raise_interrupt,
8249 * don't upset it by resetting gotsig[SIGINT-1] */
8250 if (sig == SIGINT && !t)
8253 TRACE(("sig %d is active, will run handler '%s'\n", sig, t));
8257 want_exexit = evalstring(t, SKIPEVAL);
8258 exitstatus = savestatus;
8260 TRACE(("dotrap returns %d\n", want_exexit));
8265 TRACE(("dotrap returns 0\n"));
8269 /* forward declarations - evaluation is fairly recursive business... */
8270 static void evalloop(union node *, int);
8271 static void evalfor(union node *, int);
8272 static void evalcase(union node *, int);
8273 static void evalsubshell(union node *, int);
8274 static void expredir(union node *);
8275 static void evalpipe(union node *, int);
8276 static void evalcommand(union node *, int);
8277 static int evalbltin(const struct builtincmd *, int, char **);
8278 static void prehash(union node *);
8281 * Evaluate a parse tree. The value is left in the global variable
8285 evaltree(union node *n, int flags)
8287 struct jmploc *volatile savehandler = exception_handler;
8288 struct jmploc jmploc;
8290 void (*evalfn)(union node *, int);
8294 SAVE_INT(int_level);
8297 TRACE(("evaltree(NULL) called\n"));
8300 TRACE(("evaltree(%p: %d, %d) called\n", n, n->type, flags));
8302 exception_handler = &jmploc;
8304 int err = setjmp(jmploc.loc);
8306 /* if it was a signal, check for trap handlers */
8307 if (exception_type == EXSIG) {
8308 TRACE(("exception %d (EXSIG) in evaltree, err=%d\n",
8309 exception_type, err));
8312 /* continue on the way out */
8313 TRACE(("exception %d in evaltree, propagating err=%d\n",
8314 exception_type, err));
8315 exception_handler = savehandler;
8316 longjmp(exception_handler->loc, err);
8323 out1fmt("Node type = %d\n", n->type);
8328 evaltree(n->nnot.com, EV_TESTED);
8329 status = !exitstatus;
8332 expredir(n->nredir.redirect);
8333 status = redirectsafe(n->nredir.redirect, REDIR_PUSH);
8335 evaltree(n->nredir.n, flags & EV_TESTED);
8336 status = exitstatus;
8338 popredir(/*drop:*/ 0, /*restore:*/ 0 /* not sure */);
8341 evalfn = evalcommand;
8343 if (eflag && !(flags & EV_TESTED))
8355 evalfn = evalsubshell;
8368 #error NAND + 1 != NOR
8370 #if NOR + 1 != NSEMI
8371 #error NOR + 1 != NSEMI
8373 unsigned is_or = n->type - NAND;
8376 (flags | ((is_or >> 1) - 1)) & EV_TESTED
8378 if (!exitstatus == is_or)
8391 evaltree(n->nif.test, EV_TESTED);
8394 if (exitstatus == 0) {
8398 if (n->nif.elsepart) {
8399 n = n->nif.elsepart;
8404 defun(n->narg.text, n->narg.next);
8408 exitstatus = status;
8413 exception_handler = savehandler;
8415 if (checkexit & exitstatus)
8416 evalskip |= SKIPEVAL;
8417 else if (pending_sig && dotrap())
8420 if (flags & EV_EXIT) {
8422 raise_exception(EXEXIT);
8425 RESTORE_INT(int_level);
8426 TRACE(("leaving evaltree (no interrupts)\n"));
8429 #if !defined(__alpha__) || (defined(__GNUC__) && __GNUC__ >= 3)
8432 void evaltreenr(union node *, int) __attribute__ ((alias("evaltree"),__noreturn__));
8435 evalloop(union node *n, int flags)
8445 evaltree(n->nbinary.ch1, EV_TESTED);
8448 if (evalskip == SKIPCONT && --skipcount <= 0) {
8452 if (evalskip == SKIPBREAK && --skipcount <= 0)
8457 if (n->type != NWHILE)
8461 evaltree(n->nbinary.ch2, flags);
8462 status = exitstatus;
8467 exitstatus = status;
8471 evalfor(union node *n, int flags)
8473 struct arglist arglist;
8476 struct stackmark smark;
8478 setstackmark(&smark);
8479 arglist.list = NULL;
8480 arglist.lastp = &arglist.list;
8481 for (argp = n->nfor.args; argp; argp = argp->narg.next) {
8482 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE | EXP_RECORD);
8487 *arglist.lastp = NULL;
8492 for (sp = arglist.list; sp; sp = sp->next) {
8493 setvar(n->nfor.var, sp->text, 0);
8494 evaltree(n->nfor.body, flags);
8496 if (evalskip == SKIPCONT && --skipcount <= 0) {
8500 if (evalskip == SKIPBREAK && --skipcount <= 0)
8507 popstackmark(&smark);
8511 evalcase(union node *n, int flags)
8515 struct arglist arglist;
8516 struct stackmark smark;
8518 setstackmark(&smark);
8519 arglist.list = NULL;
8520 arglist.lastp = &arglist.list;
8521 expandarg(n->ncase.expr, &arglist, EXP_TILDE);
8523 for (cp = n->ncase.cases; cp && evalskip == 0; cp = cp->nclist.next) {
8524 for (patp = cp->nclist.pattern; patp; patp = patp->narg.next) {
8525 if (casematch(patp, arglist.list->text)) {
8526 if (evalskip == 0) {
8527 evaltree(cp->nclist.body, flags);
8534 popstackmark(&smark);
8538 * Kick off a subshell to evaluate a tree.
8541 evalsubshell(union node *n, int flags)
8544 int backgnd = (n->type == NBACKGND);
8547 expredir(n->nredir.redirect);
8548 if (!backgnd && (flags & EV_EXIT) && !may_have_traps)
8551 jp = makejob(/*n,*/ 1);
8552 if (forkshell(jp, n, backgnd) == 0) {
8557 flags &= ~EV_TESTED;
8559 redirect(n->nredir.redirect, 0);
8560 evaltreenr(n->nredir.n, flags);
8565 status = waitforjob(jp);
8566 exitstatus = status;
8571 * Compute the names of the files in a redirection list.
8573 static void fixredir(union node *, const char *, int);
8575 expredir(union node *n)
8579 for (redir = n; redir; redir = redir->nfile.next) {
8583 fn.lastp = &fn.list;
8584 switch (redir->type) {
8588 #if ENABLE_ASH_BASH_COMPAT
8593 expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR);
8594 #if ENABLE_ASH_BASH_COMPAT
8597 redir->nfile.expfname = fn.list->text;
8600 case NTOFD: /* >& */
8601 if (redir->ndup.vname) {
8602 expandarg(redir->ndup.vname, &fn, EXP_FULL | EXP_TILDE);
8603 if (fn.list == NULL)
8604 ash_msg_and_raise_error("redir error");
8605 #if ENABLE_ASH_BASH_COMPAT
8606 //FIXME: we used expandarg with different args!
8607 if (!isdigit_str9(fn.list->text)) {
8608 /* >&file, not >&fd */
8609 if (redir->nfile.fd != 1) /* 123>&file - BAD */
8610 ash_msg_and_raise_error("redir error");
8612 goto store_expfname;
8615 fixredir(redir, fn.list->text, 1);
8623 * Evaluate a pipeline. All the processes in the pipeline are children
8624 * of the process creating the pipeline. (This differs from some versions
8625 * of the shell, which make the last process in a pipeline the parent
8629 evalpipe(union node *n, int flags)
8632 struct nodelist *lp;
8637 TRACE(("evalpipe(0x%lx) called\n", (long)n));
8639 for (lp = n->npipe.cmdlist; lp; lp = lp->next)
8643 jp = makejob(/*n,*/ pipelen);
8645 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
8649 if (pipe(pip) < 0) {
8651 ash_msg_and_raise_error("pipe call failed");
8654 if (forkshell(jp, lp->n, n->npipe.pipe_backgnd) == 0) {
8667 evaltreenr(lp->n, flags);
8673 /* Don't want to trigger debugging */
8677 if (n->npipe.pipe_backgnd == 0) {
8678 exitstatus = waitforjob(jp);
8679 TRACE(("evalpipe: job done exit status %d\n", exitstatus));
8685 * Controls whether the shell is interactive or not.
8688 setinteractive(int on)
8690 static smallint is_interactive;
8692 if (++on == is_interactive)
8694 is_interactive = on;
8698 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
8699 if (is_interactive > 1) {
8700 /* Looks like they want an interactive shell */
8701 static smallint did_banner;
8704 /* note: ash and hush share this string */
8705 out1fmt("\n\n%s %s\n"
8706 "Enter 'help' for a list of built-in commands."
8709 "built-in shell (ash)"
8723 setinteractive(iflag);
8725 #if ENABLE_FEATURE_EDITING_VI
8727 line_input_state->flags |= VI_MODE;
8729 line_input_state->flags &= ~VI_MODE;
8731 viflag = 0; /* forcibly keep the option off */
8735 static struct localvar *localvars;
8738 * Called after a function returns.
8739 * Interrupts must be off.
8744 struct localvar *lvp;
8747 while ((lvp = localvars) != NULL) {
8748 localvars = lvp->next;
8750 TRACE(("poplocalvar %s\n", vp ? vp->text : "-"));
8751 if (vp == NULL) { /* $- saved */
8752 memcpy(optlist, lvp->text, sizeof(optlist));
8753 free((char*)lvp->text);
8755 } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) {
8756 unsetvar(vp->var_text);
8759 vp->var_func(var_end(lvp->text));
8760 if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
8761 free((char*)vp->var_text);
8762 vp->flags = lvp->flags;
8763 vp->var_text = lvp->text;
8770 evalfun(struct funcnode *func, int argc, char **argv, int flags)
8772 volatile struct shparam saveparam;
8773 struct localvar *volatile savelocalvars;
8774 struct jmploc *volatile savehandler;
8775 struct jmploc jmploc;
8778 saveparam = shellparam;
8779 savelocalvars = localvars;
8780 e = setjmp(jmploc.loc);
8785 savehandler = exception_handler;
8786 exception_handler = &jmploc;
8788 shellparam.malloced = 0;
8792 shellparam.nparam = argc - 1;
8793 shellparam.p = argv + 1;
8794 #if ENABLE_ASH_GETOPTS
8795 shellparam.optind = 1;
8796 shellparam.optoff = -1;
8798 evaltree(&func->n, flags & EV_TESTED);
8804 localvars = savelocalvars;
8805 freeparam(&shellparam);
8806 shellparam = saveparam;
8807 exception_handler = savehandler;
8809 evalskip &= ~SKIPFUNC;
8813 #if ENABLE_ASH_CMDCMD
8815 parse_command_args(char **argv, const char **path)
8828 if (c == '-' && !*cp) {
8835 *path = bb_default_path;
8838 /* run 'typecmd' for other options */
8849 * Make a variable a local variable. When a variable is made local, it's
8850 * value and flags are saved in a localvar structure. The saved values
8851 * will be restored when the shell function returns. We handle the name
8852 * "-" as a special case.
8857 struct localvar *lvp;
8862 lvp = ckzalloc(sizeof(struct localvar));
8863 if (LONE_DASH(name)) {
8865 p = ckmalloc(sizeof(optlist));
8866 lvp->text = memcpy(p, optlist, sizeof(optlist));
8871 vpp = hashvar(name);
8872 vp = *findvar(vpp, name);
8873 eq = strchr(name, '=');
8876 setvareq(name, VSTRFIXED);
8878 setvar(name, NULL, VSTRFIXED);
8879 vp = *vpp; /* the new variable */
8880 lvp->flags = VUNSET;
8882 lvp->text = vp->var_text;
8883 lvp->flags = vp->flags;
8884 vp->flags |= VSTRFIXED|VTEXTFIXED;
8890 lvp->next = localvars;
8896 * The "local" command.
8898 static int FAST_FUNC
8899 localcmd(int argc UNUSED_PARAM, char **argv)
8904 while ((name = *argv++) != NULL) {
8910 static int FAST_FUNC
8911 falsecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
8916 static int FAST_FUNC
8917 truecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
8922 static int FAST_FUNC
8923 execcmd(int argc UNUSED_PARAM, char **argv)
8926 iflag = 0; /* exit on error */
8929 shellexec(argv + 1, pathval(), 0);
8935 * The return command.
8937 static int FAST_FUNC
8938 returncmd(int argc UNUSED_PARAM, char **argv)
8941 * If called outside a function, do what ksh does;
8942 * skip the rest of the file.
8944 evalskip = funcnest ? SKIPFUNC : SKIPFILE;
8945 return argv[1] ? number(argv[1]) : exitstatus;
8948 /* Forward declarations for builtintab[] */
8949 static int breakcmd(int, char **) FAST_FUNC;
8950 static int dotcmd(int, char **) FAST_FUNC;
8951 static int evalcmd(int, char **) FAST_FUNC;
8952 static int exitcmd(int, char **) FAST_FUNC;
8953 static int exportcmd(int, char **) FAST_FUNC;
8954 #if ENABLE_ASH_GETOPTS
8955 static int getoptscmd(int, char **) FAST_FUNC;
8957 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
8958 static int helpcmd(int, char **) FAST_FUNC;
8960 #if ENABLE_SH_MATH_SUPPORT
8961 static int letcmd(int, char **) FAST_FUNC;
8963 static int readcmd(int, char **) FAST_FUNC;
8964 static int setcmd(int, char **) FAST_FUNC;
8965 static int shiftcmd(int, char **) FAST_FUNC;
8966 static int timescmd(int, char **) FAST_FUNC;
8967 static int trapcmd(int, char **) FAST_FUNC;
8968 static int umaskcmd(int, char **) FAST_FUNC;
8969 static int unsetcmd(int, char **) FAST_FUNC;
8970 static int ulimitcmd(int, char **) FAST_FUNC;
8972 #define BUILTIN_NOSPEC "0"
8973 #define BUILTIN_SPECIAL "1"
8974 #define BUILTIN_REGULAR "2"
8975 #define BUILTIN_SPEC_REG "3"
8976 #define BUILTIN_ASSIGN "4"
8977 #define BUILTIN_SPEC_ASSG "5"
8978 #define BUILTIN_REG_ASSG "6"
8979 #define BUILTIN_SPEC_REG_ASSG "7"
8981 /* Stubs for calling non-FAST_FUNC's */
8982 #if ENABLE_ASH_BUILTIN_ECHO
8983 static int FAST_FUNC echocmd(int argc, char **argv) { return echo_main(argc, argv); }
8985 #if ENABLE_ASH_BUILTIN_PRINTF
8986 static int FAST_FUNC printfcmd(int argc, char **argv) { return printf_main(argc, argv); }
8988 #if ENABLE_ASH_BUILTIN_TEST
8989 static int FAST_FUNC testcmd(int argc, char **argv) { return test_main(argc, argv); }
8992 /* Keep these in proper order since it is searched via bsearch() */
8993 static const struct builtincmd builtintab[] = {
8994 { BUILTIN_SPEC_REG "." , dotcmd },
8995 { BUILTIN_SPEC_REG ":" , truecmd },
8996 #if ENABLE_ASH_BUILTIN_TEST
8997 { BUILTIN_REGULAR "[" , testcmd },
8998 #if ENABLE_ASH_BASH_COMPAT
8999 { BUILTIN_REGULAR "[[" , testcmd },
9002 #if ENABLE_ASH_ALIAS
9003 { BUILTIN_REG_ASSG "alias" , aliascmd },
9006 { BUILTIN_REGULAR "bg" , fg_bgcmd },
9008 { BUILTIN_SPEC_REG "break" , breakcmd },
9009 { BUILTIN_REGULAR "cd" , cdcmd },
9010 { BUILTIN_NOSPEC "chdir" , cdcmd },
9011 #if ENABLE_ASH_CMDCMD
9012 { BUILTIN_REGULAR "command" , commandcmd },
9014 { BUILTIN_SPEC_REG "continue", breakcmd },
9015 #if ENABLE_ASH_BUILTIN_ECHO
9016 { BUILTIN_REGULAR "echo" , echocmd },
9018 { BUILTIN_SPEC_REG "eval" , evalcmd },
9019 { BUILTIN_SPEC_REG "exec" , execcmd },
9020 { BUILTIN_SPEC_REG "exit" , exitcmd },
9021 { BUILTIN_SPEC_REG_ASSG "export" , exportcmd },
9022 { BUILTIN_REGULAR "false" , falsecmd },
9024 { BUILTIN_REGULAR "fg" , fg_bgcmd },
9026 #if ENABLE_ASH_GETOPTS
9027 { BUILTIN_REGULAR "getopts" , getoptscmd },
9029 { BUILTIN_NOSPEC "hash" , hashcmd },
9030 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
9031 { BUILTIN_NOSPEC "help" , helpcmd },
9034 { BUILTIN_REGULAR "jobs" , jobscmd },
9035 { BUILTIN_REGULAR "kill" , killcmd },
9037 #if ENABLE_SH_MATH_SUPPORT
9038 { BUILTIN_NOSPEC "let" , letcmd },
9040 { BUILTIN_ASSIGN "local" , localcmd },
9041 #if ENABLE_ASH_BUILTIN_PRINTF
9042 { BUILTIN_REGULAR "printf" , printfcmd },
9044 { BUILTIN_NOSPEC "pwd" , pwdcmd },
9045 { BUILTIN_REGULAR "read" , readcmd },
9046 { BUILTIN_SPEC_REG_ASSG "readonly", exportcmd },
9047 { BUILTIN_SPEC_REG "return" , returncmd },
9048 { BUILTIN_SPEC_REG "set" , setcmd },
9049 { BUILTIN_SPEC_REG "shift" , shiftcmd },
9050 #if ENABLE_ASH_BASH_COMPAT
9051 { BUILTIN_SPEC_REG "source" , dotcmd },
9053 #if ENABLE_ASH_BUILTIN_TEST
9054 { BUILTIN_REGULAR "test" , testcmd },
9056 { BUILTIN_SPEC_REG "times" , timescmd },
9057 { BUILTIN_SPEC_REG "trap" , trapcmd },
9058 { BUILTIN_REGULAR "true" , truecmd },
9059 { BUILTIN_NOSPEC "type" , typecmd },
9060 { BUILTIN_NOSPEC "ulimit" , ulimitcmd },
9061 { BUILTIN_REGULAR "umask" , umaskcmd },
9062 #if ENABLE_ASH_ALIAS
9063 { BUILTIN_REGULAR "unalias" , unaliascmd },
9065 { BUILTIN_SPEC_REG "unset" , unsetcmd },
9066 { BUILTIN_REGULAR "wait" , waitcmd },
9069 /* Should match the above table! */
9070 #define COMMANDCMD (builtintab + \
9072 1 * ENABLE_ASH_BUILTIN_TEST + \
9073 1 * ENABLE_ASH_BUILTIN_TEST * ENABLE_ASH_BASH_COMPAT + \
9074 1 * ENABLE_ASH_ALIAS + \
9075 1 * ENABLE_ASH_JOB_CONTROL + \
9077 #define EXECCMD (builtintab + \
9079 1 * ENABLE_ASH_BUILTIN_TEST + \
9080 1 * ENABLE_ASH_BUILTIN_TEST * ENABLE_ASH_BASH_COMPAT + \
9081 1 * ENABLE_ASH_ALIAS + \
9082 1 * ENABLE_ASH_JOB_CONTROL + \
9084 1 * ENABLE_ASH_CMDCMD + \
9086 ENABLE_ASH_BUILTIN_ECHO + \
9090 * Search the table of builtin commands.
9092 static struct builtincmd *
9093 find_builtin(const char *name)
9095 struct builtincmd *bp;
9098 name, builtintab, ARRAY_SIZE(builtintab), sizeof(builtintab[0]),
9105 * Execute a simple command.
9108 isassignment(const char *p)
9110 const char *q = endofname(p);
9115 static int FAST_FUNC
9116 bltincmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
9118 /* Preserve exitstatus of a previous possible redirection
9119 * as POSIX mandates */
9120 return back_exitstatus;
9123 evalcommand(union node *cmd, int flags)
9125 static const struct builtincmd null_bltin = {
9126 "\0\0", bltincmd /* why three NULs? */
9128 struct stackmark smark;
9130 struct arglist arglist;
9131 struct arglist varlist;
9134 const struct strlist *sp;
9135 struct cmdentry cmdentry;
9142 struct builtincmd *bcmd;
9143 smallint cmd_is_exec;
9144 smallint pseudovarflag = 0;
9146 /* First expand the arguments. */
9147 TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags));
9148 setstackmark(&smark);
9149 back_exitstatus = 0;
9151 cmdentry.cmdtype = CMDBUILTIN;
9152 cmdentry.u.cmd = &null_bltin;
9153 varlist.lastp = &varlist.list;
9154 *varlist.lastp = NULL;
9155 arglist.lastp = &arglist.list;
9156 *arglist.lastp = NULL;
9159 if (cmd->ncmd.args) {
9160 bcmd = find_builtin(cmd->ncmd.args->narg.text);
9161 pseudovarflag = bcmd && IS_BUILTIN_ASSIGN(bcmd);
9164 for (argp = cmd->ncmd.args; argp; argp = argp->narg.next) {
9165 struct strlist **spp;
9167 spp = arglist.lastp;
9168 if (pseudovarflag && isassignment(argp->narg.text))
9169 expandarg(argp, &arglist, EXP_VARTILDE);
9171 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
9173 for (sp = *spp; sp; sp = sp->next)
9177 argv = nargv = stalloc(sizeof(char *) * (argc + 1));
9178 for (sp = arglist.list; sp; sp = sp->next) {
9179 TRACE(("evalcommand arg: %s\n", sp->text));
9180 *nargv++ = sp->text;
9185 if (iflag && funcnest == 0 && argc > 0)
9186 lastarg = nargv[-1];
9189 expredir(cmd->ncmd.redirect);
9190 status = redirectsafe(cmd->ncmd.redirect, REDIR_PUSH | REDIR_SAVEFD2);
9192 path = vpath.var_text;
9193 for (argp = cmd->ncmd.assign; argp; argp = argp->narg.next) {
9194 struct strlist **spp;
9197 spp = varlist.lastp;
9198 expandarg(argp, &varlist, EXP_VARTILDE);
9201 * Modify the command lookup path, if a PATH= assignment
9205 if (varcmp(p, path) == 0)
9209 /* Print the command if xflag is set. */
9212 const char *p = " %s" + 1;
9214 fdprintf(preverrout_fd, p, expandstr(ps4val()));
9216 for (n = 0; n < 2; n++) {
9218 fdprintf(preverrout_fd, p, sp->text);
9224 safe_write(preverrout_fd, "\n", 1);
9230 /* Now locate the command. */
9232 const char *oldpath;
9233 int cmd_flag = DO_ERR;
9238 find_command(argv[0], &cmdentry, cmd_flag, path);
9239 if (cmdentry.cmdtype == CMDUNKNOWN) {
9240 flush_stdout_stderr();
9245 /* implement bltin and command here */
9246 if (cmdentry.cmdtype != CMDBUILTIN)
9249 spclbltin = IS_BUILTIN_SPECIAL(cmdentry.u.cmd);
9250 if (cmdentry.u.cmd == EXECCMD)
9252 #if ENABLE_ASH_CMDCMD
9253 if (cmdentry.u.cmd == COMMANDCMD) {
9255 nargv = parse_command_args(argv, &path);
9258 argc -= nargv - argv;
9260 cmd_flag |= DO_NOFUNC;
9268 /* We have a redirection error. */
9270 raise_exception(EXERROR);
9272 exitstatus = status;
9276 /* Execute the command. */
9277 switch (cmdentry.cmdtype) {
9280 #if ENABLE_FEATURE_SH_NOFORK
9281 /* (1) BUG: if variables are set, we need to fork, or save/restore them
9282 * around run_nofork_applet() call.
9283 * (2) Should this check also be done in forkshell()?
9284 * (perhaps it should, so that "VAR=VAL nofork" at least avoids exec...)
9286 /* find_command() encodes applet_no as (-2 - applet_no) */
9287 int applet_no = (- cmdentry.u.index - 2);
9288 if (applet_no >= 0 && APPLET_IS_NOFORK(applet_no)) {
9289 listsetvar(varlist.list, VEXPORT|VSTACK);
9290 /* run <applet>_main() */
9291 exitstatus = run_nofork_applet(applet_no, argv);
9295 /* Can we avoid forking off? For example, very last command
9296 * in a script or a subshell does not need forking,
9297 * we can just exec it.
9299 if (!(flags & EV_EXIT) || may_have_traps) {
9300 /* No, forking off a child is necessary */
9302 jp = makejob(/*cmd,*/ 1);
9303 if (forkshell(jp, cmd, FORK_FG) != 0) {
9305 exitstatus = waitforjob(jp);
9307 TRACE(("forked child exited with %d\n", exitstatus));
9312 /* fall through to exec'ing external program */
9314 listsetvar(varlist.list, VEXPORT|VSTACK);
9315 shellexec(argv, path, cmdentry.u.index);
9319 cmdenviron = varlist.list;
9321 struct strlist *list = cmdenviron;
9323 if (spclbltin > 0 || argc == 0) {
9325 if (cmd_is_exec && argc > 1)
9328 listsetvar(list, i);
9330 /* Tight loop with builtins only:
9331 * "while kill -0 $child; do true; done"
9332 * will never exit even if $child died, unless we do this
9333 * to reap the zombie and make kill detect that it's gone: */
9334 dowait(DOWAIT_NONBLOCK, NULL);
9336 if (evalbltin(cmdentry.u.cmd, argc, argv)) {
9338 int i = exception_type;
9343 exit_status = 128 + SIGINT;
9345 exit_status = 128 + pending_sig;
9346 exitstatus = exit_status;
9347 if (i == EXINT || spclbltin > 0) {
9349 longjmp(exception_handler->loc, 1);
9356 listsetvar(varlist.list, 0);
9357 /* See above for the rationale */
9358 dowait(DOWAIT_NONBLOCK, NULL);
9359 if (evalfun(cmdentry.u.func, argc, argv, flags))
9366 popredir(/*drop:*/ cmd_is_exec, /*restore:*/ cmd_is_exec);
9368 /* dsl: I think this is intended to be used to support
9369 * '_' in 'vi' command mode during line editing...
9370 * However I implemented that within libedit itself.
9372 setvar("_", lastarg, 0);
9374 popstackmark(&smark);
9378 evalbltin(const struct builtincmd *cmd, int argc, char **argv)
9380 char *volatile savecmdname;
9381 struct jmploc *volatile savehandler;
9382 struct jmploc jmploc;
9385 savecmdname = commandname;
9386 i = setjmp(jmploc.loc);
9389 savehandler = exception_handler;
9390 exception_handler = &jmploc;
9391 commandname = argv[0];
9393 optptr = NULL; /* initialize nextopt */
9394 exitstatus = (*cmd->builtin)(argc, argv);
9395 flush_stdout_stderr();
9397 exitstatus |= ferror(stdout);
9399 commandname = savecmdname;
9400 exception_handler = savehandler;
9406 goodname(const char *p)
9408 return !*endofname(p);
9413 * Search for a command. This is called before we fork so that the
9414 * location of the command will be available in the parent as well as
9415 * the child. The check for "goodname" is an overly conservative
9416 * check that the name will not be subject to expansion.
9419 prehash(union node *n)
9421 struct cmdentry entry;
9423 if (n->type == NCMD && n->ncmd.args && goodname(n->ncmd.args->narg.text))
9424 find_command(n->ncmd.args->narg.text, &entry, 0, pathval());
9428 /* ============ Builtin commands
9430 * Builtin commands whose functions are closely tied to evaluation
9431 * are implemented here.
9435 * Handle break and continue commands. Break, continue, and return are
9436 * all handled by setting the evalskip flag. The evaluation routines
9437 * above all check this flag, and if it is set they start skipping
9438 * commands rather than executing them. The variable skipcount is
9439 * the number of loops to break/continue, or the number of function
9440 * levels to return. (The latter is always 1.) It should probably
9441 * be an error to break out of more loops than exist, but it isn't
9442 * in the standard shell so we don't make it one here.
9444 static int FAST_FUNC
9445 breakcmd(int argc UNUSED_PARAM, char **argv)
9447 int n = argv[1] ? number(argv[1]) : 1;
9450 ash_msg_and_raise_error(msg_illnum, argv[1]);
9454 evalskip = (**argv == 'c') ? SKIPCONT : SKIPBREAK;
9461 /* ============ input.c
9463 * This implements the input routines used by the parser.
9467 INPUT_PUSH_FILE = 1,
9468 INPUT_NOFILE_OK = 2,
9471 static smallint checkkwd;
9472 /* values of checkkwd variable */
9473 #define CHKALIAS 0x1
9478 * Push a string back onto the input at this current parsefile level.
9479 * We handle aliases this way.
9481 #if !ENABLE_ASH_ALIAS
9482 #define pushstring(s, ap) pushstring(s)
9485 pushstring(char *s, struct alias *ap)
9492 if (g_parsefile->strpush) {
9493 sp = ckzalloc(sizeof(*sp));
9494 sp->prev = g_parsefile->strpush;
9496 sp = &(g_parsefile->basestrpush);
9498 g_parsefile->strpush = sp;
9499 sp->prev_string = g_parsefile->next_to_pgetc;
9500 sp->prev_left_in_line = g_parsefile->left_in_line;
9501 #if ENABLE_ASH_ALIAS
9504 ap->flag |= ALIASINUSE;
9508 g_parsefile->next_to_pgetc = s;
9509 g_parsefile->left_in_line = len;
9516 struct strpush *sp = g_parsefile->strpush;
9519 #if ENABLE_ASH_ALIAS
9521 if (g_parsefile->next_to_pgetc[-1] == ' '
9522 || g_parsefile->next_to_pgetc[-1] == '\t'
9524 checkkwd |= CHKALIAS;
9526 if (sp->string != sp->ap->val) {
9529 sp->ap->flag &= ~ALIASINUSE;
9530 if (sp->ap->flag & ALIASDEAD) {
9531 unalias(sp->ap->name);
9535 g_parsefile->next_to_pgetc = sp->prev_string;
9536 g_parsefile->left_in_line = sp->prev_left_in_line;
9537 g_parsefile->strpush = sp->prev;
9538 if (sp != &(g_parsefile->basestrpush))
9543 //FIXME: BASH_COMPAT with "...&" does TWO pungetc():
9544 //it peeks whether it is &>, and then pushes back both chars.
9545 //This function needs to save last *next_to_pgetc to buf[0]
9546 //to make two pungetc() reliable. Currently,
9547 // pgetc (out of buf: does preadfd), pgetc, pungetc, pungetc won't work...
9552 char *buf = g_parsefile->buf;
9554 g_parsefile->next_to_pgetc = buf;
9555 #if ENABLE_FEATURE_EDITING
9557 if (!iflag || g_parsefile->pf_fd != STDIN_FILENO)
9558 nr = nonblock_safe_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1);
9560 #if ENABLE_FEATURE_TAB_COMPLETION
9561 line_input_state->path_lookup = pathval();
9563 nr = read_line_input(cmdedit_prompt, buf, IBUFSIZ, line_input_state);
9565 /* Ctrl+C pressed */
9574 if (nr < 0 && errno == 0) {
9575 /* Ctrl+D pressed */
9580 nr = nonblock_safe_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1);
9584 /* nonblock_safe_read() handles this problem */
9586 if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
9587 int flags = fcntl(0, F_GETFL);
9588 if (flags >= 0 && (flags & O_NONBLOCK)) {
9589 flags &= ~O_NONBLOCK;
9590 if (fcntl(0, F_SETFL, flags) >= 0) {
9591 out2str("sh: turning off NDELAY mode\n");
9602 * Refill the input buffer and return the next input character:
9604 * 1) If a string was pushed back on the input, pop it;
9605 * 2) If an EOF was pushed back (g_parsefile->left_in_line < -BIGNUM)
9606 * or we are reading from a string so we can't refill the buffer,
9608 * 3) If there is more stuff in this buffer, use it else call read to fill it.
9609 * 4) Process input up to the next newline, deleting nul characters.
9611 //#define pgetc_debug(...) bb_error_msg(__VA_ARGS__)
9612 #define pgetc_debug(...) ((void)0)
9619 while (g_parsefile->strpush) {
9620 #if ENABLE_ASH_ALIAS
9621 if (g_parsefile->left_in_line == -1
9622 && g_parsefile->strpush->ap
9623 && g_parsefile->next_to_pgetc[-1] != ' '
9624 && g_parsefile->next_to_pgetc[-1] != '\t'
9626 pgetc_debug("preadbuffer PEOA");
9631 /* try "pgetc" now: */
9632 pgetc_debug("preadbuffer internal pgetc at %d:%p'%s'",
9633 g_parsefile->left_in_line,
9634 g_parsefile->next_to_pgetc,
9635 g_parsefile->next_to_pgetc);
9636 if (--g_parsefile->left_in_line >= 0)
9637 return (unsigned char)(*g_parsefile->next_to_pgetc++);
9639 /* on both branches above g_parsefile->left_in_line < 0.
9640 * "pgetc" needs refilling.
9643 /* -90 is our -BIGNUM. Below we use -99 to mark "EOF on read",
9644 * pungetc() may increment it a few times.
9645 * Assuming it won't increment it to less than -90.
9647 if (g_parsefile->left_in_line < -90 || g_parsefile->buf == NULL) {
9648 pgetc_debug("preadbuffer PEOF1");
9649 /* even in failure keep left_in_line and next_to_pgetc
9650 * in lock step, for correct multi-layer pungetc.
9651 * left_in_line was decremented before preadbuffer(),
9652 * must inc next_to_pgetc: */
9653 g_parsefile->next_to_pgetc++;
9657 more = g_parsefile->left_in_buffer;
9659 flush_stdout_stderr();
9663 /* don't try reading again */
9664 g_parsefile->left_in_line = -99;
9665 pgetc_debug("preadbuffer PEOF2");
9666 g_parsefile->next_to_pgetc++;
9671 /* Find out where's the end of line.
9672 * Set g_parsefile->left_in_line
9673 * and g_parsefile->left_in_buffer acordingly.
9674 * NUL chars are deleted.
9676 q = g_parsefile->next_to_pgetc;
9684 memmove(q, q + 1, more);
9688 g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1;
9694 g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1;
9695 if (g_parsefile->left_in_line < 0)
9700 g_parsefile->left_in_buffer = more;
9705 out2str(g_parsefile->next_to_pgetc);
9709 pgetc_debug("preadbuffer at %d:%p'%s'",
9710 g_parsefile->left_in_line,
9711 g_parsefile->next_to_pgetc,
9712 g_parsefile->next_to_pgetc);
9713 return (unsigned char)*g_parsefile->next_to_pgetc++;
9716 #define pgetc_as_macro() \
9717 (--g_parsefile->left_in_line >= 0 \
9718 ? (unsigned char)*g_parsefile->next_to_pgetc++ \
9725 pgetc_debug("pgetc_fast at %d:%p'%s'",
9726 g_parsefile->left_in_line,
9727 g_parsefile->next_to_pgetc,
9728 g_parsefile->next_to_pgetc);
9729 return pgetc_as_macro();
9732 #if ENABLE_ASH_OPTIMIZE_FOR_SIZE
9733 # define pgetc_fast() pgetc()
9735 # define pgetc_fast() pgetc_as_macro()
9738 #if ENABLE_ASH_ALIAS
9740 pgetc_without_PEOA(void)
9744 pgetc_debug("pgetc_fast at %d:%p'%s'",
9745 g_parsefile->left_in_line,
9746 g_parsefile->next_to_pgetc,
9747 g_parsefile->next_to_pgetc);
9749 } while (c == PEOA);
9753 # define pgetc_without_PEOA() pgetc()
9757 * Read a line from the script.
9760 pfgets(char *line, int len)
9766 while (--nleft > 0) {
9767 c = pgetc_without_PEOA();
9782 * Undo the last call to pgetc. Only one character may be pushed back.
9783 * PEOF may be pushed back.
9788 g_parsefile->left_in_line++;
9789 g_parsefile->next_to_pgetc--;
9790 pgetc_debug("pushed back to %d:%p'%s'",
9791 g_parsefile->left_in_line,
9792 g_parsefile->next_to_pgetc,
9793 g_parsefile->next_to_pgetc);
9797 * To handle the "." command, a stack of input files is used. Pushfile
9798 * adds a new entry to the stack and popfile restores the previous level.
9803 struct parsefile *pf;
9805 pf = ckzalloc(sizeof(*pf));
9806 pf->prev = g_parsefile;
9808 /*pf->strpush = NULL; - ckzalloc did it */
9809 /*pf->basestrpush.prev = NULL;*/
9816 struct parsefile *pf = g_parsefile;
9824 g_parsefile = pf->prev;
9830 * Return to top level.
9835 while (g_parsefile != &basepf)
9840 * Close the file(s) that the shell is reading commands from. Called
9841 * after a fork is done.
9847 if (g_parsefile->pf_fd > 0) {
9848 close(g_parsefile->pf_fd);
9849 g_parsefile->pf_fd = 0;
9854 * Like setinputfile, but takes an open file descriptor. Call this with
9858 setinputfd(int fd, int push)
9860 close_on_exec_on(fd);
9863 g_parsefile->buf = NULL;
9865 g_parsefile->pf_fd = fd;
9866 if (g_parsefile->buf == NULL)
9867 g_parsefile->buf = ckmalloc(IBUFSIZ);
9868 g_parsefile->left_in_buffer = 0;
9869 g_parsefile->left_in_line = 0;
9870 g_parsefile->linno = 1;
9874 * Set the input to take input from a file. If push is set, push the
9875 * old input onto the stack first.
9878 setinputfile(const char *fname, int flags)
9884 fd = open(fname, O_RDONLY);
9886 if (flags & INPUT_NOFILE_OK)
9888 ash_msg_and_raise_error("can't open '%s'", fname);
9891 fd2 = copyfd(fd, 10);
9894 ash_msg_and_raise_error("out of file descriptors");
9897 setinputfd(fd, flags & INPUT_PUSH_FILE);
9904 * Like setinputfile, but takes input from a string.
9907 setinputstring(char *string)
9911 g_parsefile->next_to_pgetc = string;
9912 g_parsefile->left_in_line = strlen(string);
9913 g_parsefile->buf = NULL;
9914 g_parsefile->linno = 1;
9919 /* ============ mail.c
9921 * Routines to check for mail.
9926 #define MAXMBOXES 10
9928 /* times of mailboxes */
9929 static time_t mailtime[MAXMBOXES];
9930 /* Set if MAIL or MAILPATH is changed. */
9931 static smallint mail_var_path_changed;
9934 * Print appropriate message(s) if mail has arrived.
9935 * If mail_var_path_changed is set,
9936 * then the value of MAIL has mail_var_path_changed,
9937 * so we just update the values.
9946 struct stackmark smark;
9949 setstackmark(&smark);
9950 mpath = mpathset() ? mpathval() : mailval();
9951 for (mtp = mailtime; mtp < mailtime + MAXMBOXES; mtp++) {
9952 p = path_advance(&mpath, nullstr);
9957 for (q = p; *q; q++)
9963 q[-1] = '\0'; /* delete trailing '/' */
9964 if (stat(p, &statb) < 0) {
9968 if (!mail_var_path_changed && statb.st_mtime != *mtp) {
9971 pathopt ? pathopt : "you have mail"
9974 *mtp = statb.st_mtime;
9976 mail_var_path_changed = 0;
9977 popstackmark(&smark);
9980 static void FAST_FUNC
9981 changemail(const char *val UNUSED_PARAM)
9983 mail_var_path_changed = 1;
9986 #endif /* ASH_MAIL */
9989 /* ============ ??? */
9992 * Set the shell parameters.
9995 setparam(char **argv)
10001 for (nparam = 0; argv[nparam]; nparam++)
10003 ap = newparam = ckmalloc((nparam + 1) * sizeof(*ap));
10005 *ap++ = ckstrdup(*argv++);
10008 freeparam(&shellparam);
10009 shellparam.malloced = 1;
10010 shellparam.nparam = nparam;
10011 shellparam.p = newparam;
10012 #if ENABLE_ASH_GETOPTS
10013 shellparam.optind = 1;
10014 shellparam.optoff = -1;
10019 * Process shell options. The global variable argptr contains a pointer
10020 * to the argument list; we advance it past the options.
10022 * SUSv3 section 2.8.1 "Consequences of Shell Errors" says:
10023 * For a non-interactive shell, an error condition encountered
10024 * by a special built-in ... shall cause the shell to write a diagnostic message
10025 * to standard error and exit as shown in the following table:
10026 * Error Special Built-In
10028 * Utility syntax error (option or operand error) Shall exit
10030 * However, in bug 1142 (http://busybox.net/bugs/view.php?id=1142)
10031 * we see that bash does not do that (set "finishes" with error code 1 instead,
10032 * and shell continues), and people rely on this behavior!
10034 * set -o barfoo 2>/dev/null
10037 * Oh well. Let's mimic that.
10040 plus_minus_o(char *name, int val)
10045 for (i = 0; i < NOPTS; i++) {
10046 if (strcmp(name, optnames(i)) == 0) {
10051 ash_msg("illegal option %co %s", val ? '-' : '+', name);
10054 for (i = 0; i < NOPTS; i++) {
10056 out1fmt("%-16s%s\n", optnames(i), optlist[i] ? "on" : "off");
10058 out1fmt("set %co %s\n", optlist[i] ? '-' : '+', optnames(i));
10064 setoption(int flag, int val)
10068 for (i = 0; i < NOPTS; i++) {
10069 if (optletters(i) == flag) {
10074 ash_msg_and_raise_error("illegal option %c%c", val ? '-' : '+', flag);
10078 options(int cmdline)
10086 while ((p = *argptr) != NULL) {
10088 if (c != '-' && c != '+')
10091 val = 0; /* val = 0 if c == '+' */
10094 if (p[0] == '\0' || LONE_DASH(p)) {
10096 /* "-" means turn off -x and -v */
10099 /* "--" means reset params */
10100 else if (*argptr == NULL)
10103 break; /* "-" or "--" terminates options */
10106 /* first char was + or - */
10107 while ((c = *p++) != '\0') {
10108 /* bash 3.2 indeed handles -c CMD and +c CMD the same */
10109 if (c == 'c' && cmdline) {
10110 minusc = p; /* command is after shell args */
10111 } else if (c == 'o') {
10112 if (plus_minus_o(*argptr, val)) {
10113 /* it already printed err message */
10114 return 1; /* error */
10118 } else if (cmdline && (c == 'l')) { /* -l or +l == --login */
10120 /* bash does not accept +-login, we also won't */
10121 } else if (cmdline && val && (c == '-')) { /* long options */
10122 if (strcmp(p, "login") == 0)
10134 * The shift builtin command.
10136 static int FAST_FUNC
10137 shiftcmd(int argc UNUSED_PARAM, char **argv)
10144 n = number(argv[1]);
10145 if (n > shellparam.nparam)
10146 n = 0; /* bash compat, was = shellparam.nparam; */
10148 shellparam.nparam -= n;
10149 for (ap1 = shellparam.p; --n >= 0; ap1++) {
10150 if (shellparam.malloced)
10153 ap2 = shellparam.p;
10154 while ((*ap2++ = *ap1++) != NULL)
10156 #if ENABLE_ASH_GETOPTS
10157 shellparam.optind = 1;
10158 shellparam.optoff = -1;
10165 * POSIX requires that 'set' (but not export or readonly) output the
10166 * variables in lexicographic order - by the locale's collating order (sigh).
10167 * Maybe we could keep them in an ordered balanced binary tree
10168 * instead of hashed lists.
10169 * For now just roll 'em through qsort for printing...
10172 showvars(const char *sep_prefix, int on, int off)
10175 char **ep, **epend;
10177 ep = listvars(on, off, &epend);
10178 qsort(ep, epend - ep, sizeof(char *), vpcmp);
10180 sep = *sep_prefix ? " " : sep_prefix;
10182 for (; ep < epend; ep++) {
10186 p = strchrnul(*ep, '=');
10189 q = single_quote(++p);
10190 out1fmt("%s%s%.*s%s\n", sep_prefix, sep, (int)(p - *ep), *ep, q);
10196 * The set command builtin.
10198 static int FAST_FUNC
10199 setcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
10204 return showvars(nullstr, 0, VUNSET);
10207 if (!options(0)) { /* if no parse error... */
10210 if (*argptr != NULL) {
10218 #if ENABLE_ASH_RANDOM_SUPPORT
10219 static void FAST_FUNC
10220 change_random(const char *value)
10224 if (value == NULL) {
10225 /* "get", generate */
10226 t = next_random(&random_gen);
10227 /* set without recursion */
10228 setvar(vrandom.var_text, utoa(t), VNOFUNC);
10229 vrandom.flags &= ~VNOFUNC;
10232 t = strtoul(value, NULL, 10);
10233 INIT_RANDOM_T(&random_gen, (t ? t : 1), t);
10238 #if ENABLE_ASH_GETOPTS
10240 getopts(char *optstr, char *optvar, char **optfirst, int *param_optind, int *optoff)
10249 if (*param_optind < 1)
10251 optnext = optfirst + *param_optind - 1;
10253 if (*param_optind <= 1 || *optoff < 0 || (int)strlen(optnext[-1]) < *optoff)
10256 p = optnext[-1] + *optoff;
10257 if (p == NULL || *p == '\0') {
10258 /* Current word is done, advance */
10260 if (p == NULL || *p != '-' || *++p == '\0') {
10267 if (LONE_DASH(p)) /* check for "--" */
10272 for (q = optstr; *q != c;) {
10274 if (optstr[0] == ':') {
10277 err |= setvarsafe("OPTARG", s, 0);
10279 fprintf(stderr, "Illegal option -%c\n", c);
10280 unsetvar("OPTARG");
10290 if (*p == '\0' && (p = *optnext) == NULL) {
10291 if (optstr[0] == ':') {
10294 err |= setvarsafe("OPTARG", s, 0);
10297 fprintf(stderr, "No arg for -%c option\n", c);
10298 unsetvar("OPTARG");
10306 err |= setvarsafe("OPTARG", p, 0);
10309 err |= setvarsafe("OPTARG", nullstr, 0);
10311 *optoff = p ? p - *(optnext - 1) : -1;
10312 *param_optind = optnext - optfirst + 1;
10313 fmtstr(s, sizeof(s), "%d", *param_optind);
10314 err |= setvarsafe("OPTIND", s, VNOFUNC);
10317 err |= setvarsafe(optvar, s, 0);
10321 flush_stdout_stderr();
10322 raise_exception(EXERROR);
10328 * The getopts builtin. Shellparam.optnext points to the next argument
10329 * to be processed. Shellparam.optptr points to the next character to
10330 * be processed in the current argument. If shellparam.optnext is NULL,
10331 * then it's the first time getopts has been called.
10333 static int FAST_FUNC
10334 getoptscmd(int argc, char **argv)
10339 ash_msg_and_raise_error("usage: getopts optstring var [arg]");
10341 optbase = shellparam.p;
10342 if (shellparam.optind > shellparam.nparam + 1) {
10343 shellparam.optind = 1;
10344 shellparam.optoff = -1;
10347 optbase = &argv[3];
10348 if (shellparam.optind > argc - 2) {
10349 shellparam.optind = 1;
10350 shellparam.optoff = -1;
10354 return getopts(argv[1], argv[2], optbase, &shellparam.optind,
10355 &shellparam.optoff);
10357 #endif /* ASH_GETOPTS */
10360 /* ============ Shell parser */
10363 struct heredoc *next; /* next here document in list */
10364 union node *here; /* redirection node */
10365 char *eofmark; /* string indicating end of input */
10366 smallint striptabs; /* if set, strip leading tabs */
10369 static smallint tokpushback; /* last token pushed back */
10370 static smallint parsebackquote; /* nonzero if we are inside backquotes */
10371 static smallint quoteflag; /* set if (part of) last token was quoted */
10372 static token_id_t lasttoken; /* last token read (integer id Txxx) */
10373 static struct heredoc *heredoclist; /* list of here documents to read */
10374 static char *wordtext; /* text of last word returned by readtoken */
10375 static struct nodelist *backquotelist;
10376 static union node *redirnode;
10377 static struct heredoc *heredoc;
10379 static const char *
10380 tokname(char *buf, int tok)
10383 return tokname_array[tok] + 1;
10384 sprintf(buf, "\"%s\"", tokname_array[tok] + 1);
10388 /* raise_error_unexpected_syntax:
10389 * Called when an unexpected token is read during the parse. The argument
10390 * is the token that is expected, or -1 if more than one type of token can
10391 * occur at this point.
10393 static void raise_error_unexpected_syntax(int) NORETURN;
10395 raise_error_unexpected_syntax(int token)
10401 l = sprintf(msg, "unexpected %s", tokname(buf, lasttoken));
10403 sprintf(msg + l, " (expecting %s)", tokname(buf, token));
10404 raise_error_syntax(msg);
10408 #define EOFMARKLEN 79
10410 /* parsing is heavily cross-recursive, need these forward decls */
10411 static union node *andor(void);
10412 static union node *pipeline(void);
10413 static union node *parse_command(void);
10414 static void parseheredoc(void);
10415 static char peektoken(void);
10416 static int readtoken(void);
10418 static union node *
10421 union node *n1, *n2, *n3;
10424 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10425 if (nlflag == 2 && peektoken())
10431 if (tok == TBACKGND) {
10432 if (n2->type == NPIPE) {
10433 n2->npipe.pipe_backgnd = 1;
10435 if (n2->type != NREDIR) {
10436 n3 = stzalloc(sizeof(struct nredir));
10438 /*n3->nredir.redirect = NULL; - stzalloc did it */
10441 n2->type = NBACKGND;
10447 n3 = stzalloc(sizeof(struct nbinary));
10449 n3->nbinary.ch1 = n1;
10450 n3->nbinary.ch2 = n2;
10466 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10474 pungetc(); /* push back EOF on input */
10478 raise_error_unexpected_syntax(-1);
10485 static union node *
10488 union node *n1, *n2, *n3;
10496 } else if (t == TOR) {
10502 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10504 n3 = stzalloc(sizeof(struct nbinary));
10506 n3->nbinary.ch1 = n1;
10507 n3->nbinary.ch2 = n2;
10512 static union node *
10515 union node *n1, *n2, *pipenode;
10516 struct nodelist *lp, *prev;
10520 TRACE(("pipeline: entered\n"));
10521 if (readtoken() == TNOT) {
10523 checkkwd = CHKKWD | CHKALIAS;
10526 n1 = parse_command();
10527 if (readtoken() == TPIPE) {
10528 pipenode = stzalloc(sizeof(struct npipe));
10529 pipenode->type = NPIPE;
10530 /*pipenode->npipe.pipe_backgnd = 0; - stzalloc did it */
10531 lp = stzalloc(sizeof(struct nodelist));
10532 pipenode->npipe.cmdlist = lp;
10536 lp = stzalloc(sizeof(struct nodelist));
10537 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10538 lp->n = parse_command();
10540 } while (readtoken() == TPIPE);
10546 n2 = stzalloc(sizeof(struct nnot));
10554 static union node *
10559 n = stzalloc(sizeof(struct narg));
10561 /*n->narg.next = NULL; - stzalloc did it */
10562 n->narg.text = wordtext;
10563 n->narg.backquote = backquotelist;
10568 fixredir(union node *n, const char *text, int err)
10572 TRACE(("Fix redir %s %d\n", text, err));
10574 n->ndup.vname = NULL;
10576 fd = bb_strtou(text, NULL, 10);
10577 if (!errno && fd >= 0)
10578 n->ndup.dupfd = fd;
10579 else if (LONE_DASH(text))
10580 n->ndup.dupfd = -1;
10583 raise_error_syntax("bad fd number");
10584 n->ndup.vname = makename();
10589 * Returns true if the text contains nothing to expand (no dollar signs
10593 noexpand(const char *text)
10597 while ((c = *text++) != '\0') {
10598 if (c == CTLQUOTEMARK)
10602 else if (SIT(c, BASESYNTAX) == CCTL)
10611 union node *n = redirnode;
10613 if (readtoken() != TWORD)
10614 raise_error_unexpected_syntax(-1);
10615 if (n->type == NHERE) {
10616 struct heredoc *here = heredoc;
10620 if (quoteflag == 0)
10622 TRACE(("Here document %d\n", n->type));
10623 if (!noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN)
10624 raise_error_syntax("illegal eof marker for << redirection");
10625 rmescapes(wordtext, 0);
10626 here->eofmark = wordtext;
10628 if (heredoclist == NULL)
10629 heredoclist = here;
10631 for (p = heredoclist; p->next; p = p->next)
10635 } else if (n->type == NTOFD || n->type == NFROMFD) {
10636 fixredir(n, wordtext, 0);
10638 n->nfile.fname = makename();
10642 static union node *
10645 union node *args, **app;
10646 union node *n = NULL;
10647 union node *vars, **vpp;
10648 union node **rpp, *redir;
10650 #if ENABLE_ASH_BASH_COMPAT
10651 smallint double_brackets_flag = 0;
10661 savecheckkwd = CHKALIAS;
10664 checkkwd = savecheckkwd;
10667 #if ENABLE_ASH_BASH_COMPAT
10668 case TAND: /* "&&" */
10669 case TOR: /* "||" */
10670 if (!double_brackets_flag) {
10674 wordtext = (char *) (t == TAND ? "-a" : "-o");
10677 n = stzalloc(sizeof(struct narg));
10679 /*n->narg.next = NULL; - stzalloc did it */
10680 n->narg.text = wordtext;
10681 #if ENABLE_ASH_BASH_COMPAT
10682 if (strcmp("[[", wordtext) == 0)
10683 double_brackets_flag = 1;
10684 else if (strcmp("]]", wordtext) == 0)
10685 double_brackets_flag = 0;
10687 n->narg.backquote = backquotelist;
10688 if (savecheckkwd && isassignment(wordtext)) {
10690 vpp = &n->narg.next;
10693 app = &n->narg.next;
10698 *rpp = n = redirnode;
10699 rpp = &n->nfile.next;
10700 parsefname(); /* read name of redirection file */
10703 if (args && app == &args->narg.next
10706 struct builtincmd *bcmd;
10709 /* We have a function */
10710 if (readtoken() != TRP)
10711 raise_error_unexpected_syntax(TRP);
10712 name = n->narg.text;
10713 if (!goodname(name)
10714 || ((bcmd = find_builtin(name)) && IS_BUILTIN_SPECIAL(bcmd))
10716 raise_error_syntax("bad function name");
10719 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10720 n->narg.next = parse_command();
10733 n = stzalloc(sizeof(struct ncmd));
10735 n->ncmd.args = args;
10736 n->ncmd.assign = vars;
10737 n->ncmd.redirect = redir;
10741 static union node *
10742 parse_command(void)
10744 union node *n1, *n2;
10745 union node *ap, **app;
10746 union node *cp, **cpp;
10747 union node *redir, **rpp;
10754 switch (readtoken()) {
10756 raise_error_unexpected_syntax(-1);
10759 n1 = stzalloc(sizeof(struct nif));
10761 n1->nif.test = list(0);
10762 if (readtoken() != TTHEN)
10763 raise_error_unexpected_syntax(TTHEN);
10764 n1->nif.ifpart = list(0);
10766 while (readtoken() == TELIF) {
10767 n2->nif.elsepart = stzalloc(sizeof(struct nif));
10768 n2 = n2->nif.elsepart;
10770 n2->nif.test = list(0);
10771 if (readtoken() != TTHEN)
10772 raise_error_unexpected_syntax(TTHEN);
10773 n2->nif.ifpart = list(0);
10775 if (lasttoken == TELSE)
10776 n2->nif.elsepart = list(0);
10778 n2->nif.elsepart = NULL;
10786 n1 = stzalloc(sizeof(struct nbinary));
10787 n1->type = (lasttoken == TWHILE) ? NWHILE : NUNTIL;
10788 n1->nbinary.ch1 = list(0);
10791 TRACE(("expecting DO got '%s' %s\n", tokname_array[got] + 1,
10792 got == TWORD ? wordtext : ""));
10793 raise_error_unexpected_syntax(TDO);
10795 n1->nbinary.ch2 = list(0);
10800 if (readtoken() != TWORD || quoteflag || !goodname(wordtext))
10801 raise_error_syntax("bad for loop variable");
10802 n1 = stzalloc(sizeof(struct nfor));
10804 n1->nfor.var = wordtext;
10805 checkkwd = CHKKWD | CHKALIAS;
10806 if (readtoken() == TIN) {
10808 while (readtoken() == TWORD) {
10809 n2 = stzalloc(sizeof(struct narg));
10811 /*n2->narg.next = NULL; - stzalloc did it */
10812 n2->narg.text = wordtext;
10813 n2->narg.backquote = backquotelist;
10815 app = &n2->narg.next;
10818 n1->nfor.args = ap;
10819 if (lasttoken != TNL && lasttoken != TSEMI)
10820 raise_error_unexpected_syntax(-1);
10822 n2 = stzalloc(sizeof(struct narg));
10824 /*n2->narg.next = NULL; - stzalloc did it */
10825 n2->narg.text = (char *)dolatstr;
10826 /*n2->narg.backquote = NULL;*/
10827 n1->nfor.args = n2;
10829 * Newline or semicolon here is optional (but note
10830 * that the original Bourne shell only allowed NL).
10832 if (lasttoken != TNL && lasttoken != TSEMI)
10835 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10836 if (readtoken() != TDO)
10837 raise_error_unexpected_syntax(TDO);
10838 n1->nfor.body = list(0);
10842 n1 = stzalloc(sizeof(struct ncase));
10844 if (readtoken() != TWORD)
10845 raise_error_unexpected_syntax(TWORD);
10846 n1->ncase.expr = n2 = stzalloc(sizeof(struct narg));
10848 /*n2->narg.next = NULL; - stzalloc did it */
10849 n2->narg.text = wordtext;
10850 n2->narg.backquote = backquotelist;
10852 checkkwd = CHKKWD | CHKALIAS;
10853 } while (readtoken() == TNL);
10854 if (lasttoken != TIN)
10855 raise_error_unexpected_syntax(TIN);
10856 cpp = &n1->ncase.cases;
10858 checkkwd = CHKNL | CHKKWD;
10860 while (t != TESAC) {
10861 if (lasttoken == TLP)
10863 *cpp = cp = stzalloc(sizeof(struct nclist));
10865 app = &cp->nclist.pattern;
10867 *app = ap = stzalloc(sizeof(struct narg));
10869 /*ap->narg.next = NULL; - stzalloc did it */
10870 ap->narg.text = wordtext;
10871 ap->narg.backquote = backquotelist;
10872 if (readtoken() != TPIPE)
10874 app = &ap->narg.next;
10877 //ap->narg.next = NULL;
10878 if (lasttoken != TRP)
10879 raise_error_unexpected_syntax(TRP);
10880 cp->nclist.body = list(2);
10882 cpp = &cp->nclist.next;
10884 checkkwd = CHKNL | CHKKWD;
10888 raise_error_unexpected_syntax(TENDCASE);
10895 n1 = stzalloc(sizeof(struct nredir));
10896 n1->type = NSUBSHELL;
10897 n1->nredir.n = list(0);
10898 /*n1->nredir.redirect = NULL; - stzalloc did it */
10908 return simplecmd();
10911 if (readtoken() != t)
10912 raise_error_unexpected_syntax(t);
10915 /* Now check for redirection which may follow command */
10916 checkkwd = CHKKWD | CHKALIAS;
10918 while (readtoken() == TREDIR) {
10919 *rpp = n2 = redirnode;
10920 rpp = &n2->nfile.next;
10926 if (n1->type != NSUBSHELL) {
10927 n2 = stzalloc(sizeof(struct nredir));
10932 n1->nredir.redirect = redir;
10937 #if ENABLE_ASH_BASH_COMPAT
10938 static int decode_dollar_squote(void)
10940 static const char C_escapes[] ALIGN1 = "nrbtfav""x\\01234567";
10946 p = strchr(C_escapes, c);
10951 if ((unsigned char)(c - '0') <= 7) { /* \ooo */
10955 } while ((unsigned char)(c - '0') <= 7 && --cnt);
10957 } else if (c == 'x') { /* \xHH */
10961 } while (isxdigit(c) && --cnt);
10963 if (cnt == 3) { /* \x but next char is "bad" */
10967 } else { /* simple seq like \\ or \t */
10972 c = bb_process_escape_sequence((void*)&p);
10973 } else { /* unrecognized "\z": print both chars unless ' or " */
10974 if (c != '\'' && c != '"') {
10976 c |= 0x100; /* "please encode \, then me" */
10984 * If eofmark is NULL, read a word or a redirection symbol. If eofmark
10985 * is not NULL, read a here document. In the latter case, eofmark is the
10986 * word which marks the end of the document and striptabs is true if
10987 * leading tabs should be stripped from the document. The argument c
10988 * is the first character of the input token or document.
10990 * Because C does not have internal subroutines, I have simulated them
10991 * using goto's to implement the subroutine linkage. The following macros
10992 * will run code that appears at the end of readtoken1.
10994 #define CHECKEND() {goto checkend; checkend_return:;}
10995 #define PARSEREDIR() {goto parseredir; parseredir_return:;}
10996 #define PARSESUB() {goto parsesub; parsesub_return:;}
10997 #define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;}
10998 #define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;}
10999 #define PARSEARITH() {goto parsearith; parsearith_return:;}
11001 readtoken1(int c, int syntax, char *eofmark, int striptabs)
11003 /* NB: syntax parameter fits into smallint */
11004 /* c parameter is an unsigned char or PEOF or PEOA */
11007 char line[EOFMARKLEN + 1];
11008 struct nodelist *bqlist;
11012 smallint prevsyntax; /* syntax before arithmetic */
11013 #if ENABLE_ASH_EXPAND_PRMT
11014 smallint pssyntax; /* we are expanding a prompt string */
11016 int varnest; /* levels of variables expansion */
11017 int arinest; /* levels of arithmetic expansion */
11018 int parenlevel; /* levels of parens in arithmetic */
11019 int dqvarnest; /* levels of variables expansion within double quotes */
11021 IF_ASH_BASH_COMPAT(smallint bash_dollar_squote = 0;)
11024 /* Avoid longjmp clobbering */
11030 (void) &parenlevel;
11033 (void) &prevsyntax;
11036 startlinno = g_parsefile->linno;
11041 #if ENABLE_ASH_EXPAND_PRMT
11042 pssyntax = (syntax == PSSYNTAX);
11046 dblquote = (syntax == DQSYNTAX);
11052 STARTSTACKSTR(out);
11054 /* For each line, until end of word */
11056 CHECKEND(); /* set c to PEOF if at end of here document */
11057 for (;;) { /* until end of line or end of word */
11058 CHECKSTRSPACE(4, out); /* permit 4 calls to USTPUTC */
11059 switch (SIT(c, syntax)) {
11060 case CNL: /* '\n' */
11061 if (syntax == BASESYNTAX)
11062 goto endword; /* exit outer loop */
11064 g_parsefile->linno++;
11068 goto loop; /* continue outer loop */
11073 if (eofmark == NULL || dblquote)
11074 USTPUTC(CTLESC, out);
11075 #if ENABLE_ASH_BASH_COMPAT
11076 if (c == '\\' && bash_dollar_squote) {
11077 c = decode_dollar_squote();
11079 USTPUTC('\\', out);
11080 c = (unsigned char)c;
11086 case CBACK: /* backslash */
11087 c = pgetc_without_PEOA();
11089 USTPUTC(CTLESC, out);
11090 USTPUTC('\\', out);
11092 } else if (c == '\n') {
11096 #if ENABLE_ASH_EXPAND_PRMT
11097 if (c == '$' && pssyntax) {
11098 USTPUTC(CTLESC, out);
11099 USTPUTC('\\', out);
11102 /* Backslash is retained if we are in "str" and next char isn't special */
11107 && (c != '"' || eofmark != NULL)
11109 USTPUTC(CTLESC, out);
11110 USTPUTC('\\', out);
11112 if (SIT(c, SQSYNTAX) == CCTL)
11113 USTPUTC(CTLESC, out);
11121 if (eofmark == NULL) {
11122 USTPUTC(CTLQUOTEMARK, out);
11130 IF_ASH_BASH_COMPAT(bash_dollar_squote = 0;)
11131 if (eofmark != NULL && arinest == 0
11136 if (dqvarnest == 0) {
11137 syntax = BASESYNTAX;
11144 case CVAR: /* '$' */
11145 PARSESUB(); /* parse substitution */
11147 case CENDVAR: /* '}' */
11150 if (dqvarnest > 0) {
11157 #if ENABLE_SH_MATH_SUPPORT
11158 case CLP: /* '(' in arithmetic */
11162 case CRP: /* ')' in arithmetic */
11163 if (parenlevel > 0) {
11166 if (pgetc() == ')') {
11167 if (--arinest == 0) {
11168 syntax = prevsyntax;
11169 dblquote = (syntax == DQSYNTAX);
11174 * unbalanced parens
11175 * (don't 2nd guess - no error)
11183 case CBQUOTE: /* '`' */
11187 goto endword; /* exit outer loop */
11191 if (varnest == 0) {
11192 #if ENABLE_ASH_BASH_COMPAT
11194 if (pgetc() == '>')
11195 c = 0x100 + '>'; /* flag &> */
11199 goto endword; /* exit outer loop */
11201 IF_ASH_ALIAS(if (c != PEOA))
11208 #if ENABLE_SH_MATH_SUPPORT
11209 if (syntax == ARISYNTAX)
11210 raise_error_syntax("missing '))'");
11212 if (syntax != BASESYNTAX && !parsebackquote && eofmark == NULL)
11213 raise_error_syntax("unterminated quoted string");
11214 if (varnest != 0) {
11215 startlinno = g_parsefile->linno;
11217 raise_error_syntax("missing '}'");
11219 USTPUTC('\0', out);
11220 len = out - (char *)stackblock();
11221 out = stackblock();
11222 if (eofmark == NULL) {
11223 if ((c == '>' || c == '<' IF_ASH_BASH_COMPAT( || c == 0x100 + '>'))
11226 if (isdigit_str9(out)) {
11227 PARSEREDIR(); /* passed as params: out, c */
11228 lasttoken = TREDIR;
11231 /* else: non-number X seen, interpret it
11232 * as "NNNX>file" = "NNNX >file" */
11236 quoteflag = quotef;
11237 backquotelist = bqlist;
11238 grabstackblock(len);
11242 /* end of readtoken routine */
11245 * Check to see whether we are at the end of the here document. When this
11246 * is called, c is set to the first character of the next input line. If
11247 * we are at the end of the here document, this routine sets the c to PEOF.
11251 #if ENABLE_ASH_ALIAS
11253 c = pgetc_without_PEOA();
11256 while (c == '\t') {
11257 c = pgetc_without_PEOA();
11260 if (c == *eofmark) {
11261 if (pfgets(line, sizeof(line)) != NULL) {
11265 for (q = eofmark + 1; *q && *p == *q; p++, q++)
11267 if (*p == '\n' && *q == '\0') {
11269 g_parsefile->linno++;
11270 needprompt = doprompt;
11272 pushstring(line, NULL);
11277 goto checkend_return;
11281 * Parse a redirection operator. The variable "out" points to a string
11282 * specifying the fd to be redirected. The variable "c" contains the
11283 * first character of the redirection operator.
11286 /* out is already checked to be a valid number or "" */
11287 int fd = (*out == '\0' ? -1 : atoi(out));
11290 np = stzalloc(sizeof(struct nfile));
11295 np->type = NAPPEND;
11297 np->type = NCLOBBER;
11300 /* it also can be NTO2 (>&file), but we can't figure it out yet */
11306 #if ENABLE_ASH_BASH_COMPAT
11307 else if (c == 0x100 + '>') { /* this flags &> redirection */
11309 pgetc(); /* this is '>', no need to check */
11313 else { /* c == '<' */
11314 /*np->nfile.fd = 0; - stzalloc did it */
11318 if (sizeof(struct nfile) != sizeof(struct nhere)) {
11319 np = stzalloc(sizeof(struct nhere));
11320 /*np->nfile.fd = 0; - stzalloc did it */
11323 heredoc = stzalloc(sizeof(struct heredoc));
11324 heredoc->here = np;
11327 heredoc->striptabs = 1;
11329 /*heredoc->striptabs = 0; - stzalloc did it */
11335 np->type = NFROMFD;
11339 np->type = NFROMTO;
11351 goto parseredir_return;
11355 * Parse a substitution. At this point, we have read the dollar sign
11356 * and nothing else.
11359 /* is_special(c) evaluates to 1 for c in "!#$*-0123456789?@"; 0 otherwise
11360 * (assuming ascii char codes, as the original implementation did) */
11361 #define is_special(c) \
11362 (((unsigned)(c) - 33 < 32) \
11363 && ((0xc1ff920dU >> ((unsigned)(c) - 33)) & 1))
11365 unsigned char subtype;
11370 if (c > 255 /* PEOA or PEOF */
11371 || (c != '(' && c != '{' && !is_name(c) && !is_special(c))
11373 #if ENABLE_ASH_BASH_COMPAT
11375 bash_dollar_squote = 1;
11380 } else if (c == '(') {
11381 /* $(command) or $((arith)) */
11382 if (pgetc() == '(') {
11383 #if ENABLE_SH_MATH_SUPPORT
11386 raise_error_syntax("you disabled math support for $((arith)) syntax");
11393 /* $VAR, $<specialchar>, ${...}, or PEOA/PEOF */
11394 USTPUTC(CTLVAR, out);
11395 typeloc = out - (char *)stackblock();
11396 USTPUTC(VSNORMAL, out);
11397 subtype = VSNORMAL;
11403 c = '#'; /* ${#} - same as $# */
11405 subtype = VSLENGTH; /* ${#VAR} */
11410 if (c <= 255 /* not PEOA or PEOF */ && is_name(c)) {
11411 /* $[{[#]]NAME[}] */
11415 } while (c <= 255 /* not PEOA or PEOF */ && is_in_name(c));
11416 } else if (isdigit(c)) {
11417 /* $[{[#]]NUM[}] */
11421 } while (isdigit(c));
11422 } else if (is_special(c)) {
11423 /* $[{[#]]<specialchar>[}] */
11428 raise_error_syntax("bad substitution");
11430 if (c != '}' && subtype == VSLENGTH) {
11431 /* ${#VAR didn't end with } */
11437 if (subtype == 0) {
11438 /* ${VAR...} but not $VAR or ${#VAR} */
11439 /* c == first char after VAR */
11443 #if ENABLE_ASH_BASH_COMPAT
11444 if (c == ':' || c == '$' || isdigit(c)) {
11445 subtype = VSSUBSTR;
11447 break; /* "goto do_pungetc" is bigger (!) */
11453 static const char types[] ALIGN1 = "}-+?=";
11454 const char *p = strchr(types, c);
11457 subtype = p - types + VSNORMAL;
11463 subtype = (c == '#' ? VSTRIMLEFT : VSTRIMRIGHT);
11470 #if ENABLE_ASH_BASH_COMPAT
11472 subtype = VSREPLACE;
11476 subtype++; /* VSREPLACEALL */
11484 if (dblquote || arinest)
11486 ((unsigned char *)stackblock())[typeloc] = subtype | flags;
11487 if (subtype != VSNORMAL) {
11489 if (dblquote || arinest) {
11494 goto parsesub_return;
11498 * Called to parse command substitutions. Newstyle is set if the command
11499 * is enclosed inside $(...); nlpp is a pointer to the head of the linked
11500 * list of commands (passed by reference), and savelen is the number of
11501 * characters on the top of the stack which must be preserved.
11504 struct nodelist **nlpp;
11507 char *volatile str;
11508 struct jmploc jmploc;
11509 struct jmploc *volatile savehandler;
11511 smallint saveprompt = 0;
11514 (void) &saveprompt;
11516 savepbq = parsebackquote;
11517 if (setjmp(jmploc.loc)) {
11519 parsebackquote = 0;
11520 exception_handler = savehandler;
11521 longjmp(exception_handler->loc, 1);
11525 savelen = out - (char *)stackblock();
11527 str = ckmalloc(savelen);
11528 memcpy(str, stackblock(), savelen);
11530 savehandler = exception_handler;
11531 exception_handler = &jmploc;
11534 /* We must read until the closing backquote, giving special
11535 treatment to some slashes, and then push the string and
11536 reread it as input, interpreting it normally. */
11543 STARTSTACKSTR(pout);
11556 g_parsefile->linno++;
11560 * If eating a newline, avoid putting
11561 * the newline into the new character
11562 * stream (via the STPUTC after the
11567 if (pc != '\\' && pc != '`' && pc != '$'
11568 && (!dblquote || pc != '"')
11570 STPUTC('\\', pout);
11572 if (pc <= 255 /* not PEOA or PEOF */) {
11578 IF_ASH_ALIAS(case PEOA:)
11579 startlinno = g_parsefile->linno;
11580 raise_error_syntax("EOF in backquote substitution");
11583 g_parsefile->linno++;
11584 needprompt = doprompt;
11593 STPUTC('\0', pout);
11594 psavelen = pout - (char *)stackblock();
11595 if (psavelen > 0) {
11596 pstr = grabstackstr(pout);
11597 setinputstring(pstr);
11602 nlpp = &(*nlpp)->next;
11603 *nlpp = stzalloc(sizeof(**nlpp));
11604 /* (*nlpp)->next = NULL; - stzalloc did it */
11605 parsebackquote = oldstyle;
11608 saveprompt = doprompt;
11615 doprompt = saveprompt;
11616 else if (readtoken() != TRP)
11617 raise_error_unexpected_syntax(TRP);
11622 * Start reading from old file again, ignoring any pushed back
11623 * tokens left from the backquote parsing
11628 while (stackblocksize() <= savelen)
11630 STARTSTACKSTR(out);
11632 memcpy(out, str, savelen);
11633 STADJUST(savelen, out);
11639 parsebackquote = savepbq;
11640 exception_handler = savehandler;
11641 if (arinest || dblquote)
11642 USTPUTC(CTLBACKQ | CTLQUOTE, out);
11644 USTPUTC(CTLBACKQ, out);
11646 goto parsebackq_oldreturn;
11647 goto parsebackq_newreturn;
11650 #if ENABLE_SH_MATH_SUPPORT
11652 * Parse an arithmetic expansion (indicate start of one and set state)
11655 if (++arinest == 1) {
11656 prevsyntax = syntax;
11657 syntax = ARISYNTAX;
11658 USTPUTC(CTLARI, out);
11665 * we collapse embedded arithmetic expansion to
11666 * parenthesis, which should be equivalent
11670 goto parsearith_return;
11674 } /* end of readtoken */
11677 * Read the next input token.
11678 * If the token is a word, we set backquotelist to the list of cmds in
11679 * backquotes. We set quoteflag to true if any part of the word was
11681 * If the token is TREDIR, then we set redirnode to a structure containing
11683 * In all cases, the variable startlinno is set to the number of the line
11684 * on which the token starts.
11686 * [Change comment: here documents and internal procedures]
11687 * [Readtoken shouldn't have any arguments. Perhaps we should make the
11688 * word parsing code into a separate routine. In this case, readtoken
11689 * doesn't need to have any internal procedures, but parseword does.
11690 * We could also make parseoperator in essence the main routine, and
11691 * have parseword (readtoken1?) handle both words and redirection.]
11693 #define NEW_xxreadtoken
11694 #ifdef NEW_xxreadtoken
11695 /* singles must be first! */
11696 static const char xxreadtoken_chars[7] ALIGN1 = {
11697 '\n', '(', ')', /* singles */
11698 '&', '|', ';', /* doubles */
11702 #define xxreadtoken_singles 3
11703 #define xxreadtoken_doubles 3
11705 static const char xxreadtoken_tokens[] ALIGN1 = {
11706 TNL, TLP, TRP, /* only single occurrence allowed */
11707 TBACKGND, TPIPE, TSEMI, /* if single occurrence */
11708 TEOF, /* corresponds to trailing nul */
11709 TAND, TOR, TENDCASE /* if double occurrence */
11724 startlinno = g_parsefile->linno;
11725 for (;;) { /* until token or start of word found */
11727 if (c == ' ' || c == '\t' IF_ASH_ALIAS( || c == PEOA))
11731 while ((c = pgetc()) != '\n' && c != PEOF)
11734 } else if (c == '\\') {
11735 if (pgetc() != '\n') {
11737 break; /* return readtoken1(...) */
11739 startlinno = ++g_parsefile->linno;
11745 p = xxreadtoken_chars + sizeof(xxreadtoken_chars) - 1;
11748 g_parsefile->linno++;
11749 needprompt = doprompt;
11752 p = strchr(xxreadtoken_chars, c);
11754 break; /* return readtoken1(...) */
11756 if ((int)(p - xxreadtoken_chars) >= xxreadtoken_singles) {
11758 if (cc == c) { /* double occurrence? */
11759 p += xxreadtoken_doubles + 1;
11762 #if ENABLE_ASH_BASH_COMPAT
11763 if (c == '&' && cc == '>') /* &> */
11764 break; /* return readtoken1(...) */
11769 lasttoken = xxreadtoken_tokens[p - xxreadtoken_chars];
11774 return readtoken1(c, BASESYNTAX, (char *) NULL, 0);
11776 #else /* old xxreadtoken */
11777 #define RETURN(token) return lasttoken = token
11790 startlinno = g_parsefile->linno;
11791 for (;;) { /* until token or start of word found */
11794 case ' ': case '\t':
11795 IF_ASH_ALIAS(case PEOA:)
11798 while ((c = pgetc()) != '\n' && c != PEOF)
11803 if (pgetc() == '\n') {
11804 startlinno = ++g_parsefile->linno;
11812 g_parsefile->linno++;
11813 needprompt = doprompt;
11818 if (pgetc() == '&')
11823 if (pgetc() == '|')
11828 if (pgetc() == ';')
11841 return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
11844 #endif /* old xxreadtoken */
11851 smallint alreadyseen = tokpushback;
11854 #if ENABLE_ASH_ALIAS
11863 if (checkkwd & CHKNL) {
11870 if (t != TWORD || quoteflag) {
11875 * check for keywords
11877 if (checkkwd & CHKKWD) {
11878 const char *const *pp;
11880 pp = findkwd(wordtext);
11882 lasttoken = t = pp - tokname_array;
11883 TRACE(("keyword '%s' recognized\n", tokname_array[t] + 1));
11888 if (checkkwd & CHKALIAS) {
11889 #if ENABLE_ASH_ALIAS
11891 ap = lookupalias(wordtext, 1);
11894 pushstring(ap->val, ap);
11904 TRACE(("token '%s' %s\n", tokname_array[t] + 1, t == TWORD ? wordtext : ""));
11906 TRACE(("reread token '%s' %s\n", tokname_array[t] + 1, t == TWORD ? wordtext : ""));
11918 return tokname_array[t][0];
11922 * Read and parse a command. Returns NODE_EOF on end of file.
11923 * (NULL is a valid parse tree indicating a blank line.)
11925 static union node *
11926 parsecmd(int interact)
11931 doprompt = interact;
11933 setprompt(doprompt);
11945 * Input any here documents.
11950 struct heredoc *here;
11953 here = heredoclist;
11954 heredoclist = NULL;
11960 readtoken1(pgetc(), here->here->type == NHERE? SQSYNTAX : DQSYNTAX,
11961 here->eofmark, here->striptabs);
11962 n = stzalloc(sizeof(struct narg));
11963 n->narg.type = NARG;
11964 /*n->narg.next = NULL; - stzalloc did it */
11965 n->narg.text = wordtext;
11966 n->narg.backquote = backquotelist;
11967 here->here->nhere.doc = n;
11974 * called by editline -- any expansions to the prompt should be added here.
11976 #if ENABLE_ASH_EXPAND_PRMT
11977 static const char *
11978 expandstr(const char *ps)
11982 /* XXX Fix (char *) cast. It _is_ a bug. ps is variable's value,
11983 * and token processing _can_ alter it (delete NULs etc). */
11984 setinputstring((char *)ps);
11985 readtoken1(pgetc(), PSSYNTAX, nullstr, 0);
11988 n.narg.type = NARG;
11989 n.narg.next = NULL;
11990 n.narg.text = wordtext;
11991 n.narg.backquote = backquotelist;
11993 expandarg(&n, NULL, 0);
11994 return stackblock();
11999 * Execute a command or commands contained in a string.
12002 evalstring(char *s, int mask)
12005 struct stackmark smark;
12009 setstackmark(&smark);
12012 while ((n = parsecmd(0)) != NODE_EOF) {
12014 popstackmark(&smark);
12027 * The eval command.
12029 static int FAST_FUNC
12030 evalcmd(int argc UNUSED_PARAM, char **argv)
12039 STARTSTACKSTR(concat);
12041 concat = stack_putstr(p, concat);
12045 STPUTC(' ', concat);
12047 STPUTC('\0', concat);
12048 p = grabstackstr(concat);
12050 evalstring(p, ~SKIPEVAL);
12056 * Read and execute commands.
12057 * "Top" is nonzero for the top level command loop;
12058 * it turns on prompting if the shell is interactive.
12064 struct stackmark smark;
12068 TRACE(("cmdloop(%d) called\n", top));
12072 setstackmark(&smark);
12075 showjobs(stderr, SHOW_CHANGED);
12078 if (iflag && top) {
12080 #if ENABLE_ASH_MAIL
12084 n = parsecmd(inter);
12086 if (DEBUG > 2 && debug && (n != NODE_EOF))
12089 if (n == NODE_EOF) {
12090 if (!top || numeof >= 50)
12092 if (!stoppedjobs()) {
12095 out2str("\nUse \"exit\" to leave shell.\n");
12098 } else if (nflag == 0) {
12099 /* job_warning can only be 2,1,0. Here 2->1, 1/0->0 */
12104 popstackmark(&smark);
12109 return skip & SKIPEVAL;
12116 * Take commands from a file. To be compatible we should do a path
12117 * search for the file, which is necessary to find sub-commands.
12120 find_dot_file(char *name)
12123 const char *path = pathval();
12126 /* don't try this for absolute or relative paths */
12127 if (strchr(name, '/'))
12130 /* IIRC standards do not say whether . is to be searched.
12131 * And it is even smaller this way, making it unconditional for now:
12133 if (1) { /* ENABLE_ASH_BASH_COMPAT */
12138 while ((fullname = path_advance(&path, name)) != NULL) {
12140 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
12142 * Don't bother freeing here, since it will
12143 * be freed by the caller.
12147 if (fullname != name)
12148 stunalloc(fullname);
12151 /* not found in the PATH */
12152 ash_msg_and_raise_error("%s: not found", name);
12156 static int FAST_FUNC
12157 dotcmd(int argc, char **argv)
12160 struct strlist *sp;
12161 volatile struct shparam saveparam;
12163 for (sp = cmdenviron; sp; sp = sp->next)
12164 setvareq(ckstrdup(sp->text), VSTRFIXED | VTEXTFIXED);
12167 /* bash says: "bash: .: filename argument required" */
12168 return 2; /* bash compat */
12171 /* "false; . empty_file; echo $?" should print 0, not 1: */
12174 fullname = find_dot_file(argv[1]);
12178 if (argc) { /* argc > 0, argv[0] != NULL */
12179 saveparam = shellparam;
12180 shellparam.malloced = 0;
12181 shellparam.nparam = argc;
12182 shellparam.p = argv;
12185 setinputfile(fullname, INPUT_PUSH_FILE);
12186 commandname = fullname;
12191 freeparam(&shellparam);
12192 shellparam = saveparam;
12198 static int FAST_FUNC
12199 exitcmd(int argc UNUSED_PARAM, char **argv)
12204 exitstatus = number(argv[1]);
12205 raise_exception(EXEXIT);
12210 * Read a file containing shell functions.
12213 readcmdfile(char *name)
12215 setinputfile(name, INPUT_PUSH_FILE);
12221 /* ============ find_command inplementation */
12224 * Resolve a command name. If you change this routine, you may have to
12225 * change the shellexec routine as well.
12228 find_command(char *name, struct cmdentry *entry, int act, const char *path)
12230 struct tblentry *cmdp;
12237 struct builtincmd *bcmd;
12239 /* If name contains a slash, don't use PATH or hash table */
12240 if (strchr(name, '/') != NULL) {
12241 entry->u.index = -1;
12242 if (act & DO_ABS) {
12243 while (stat(name, &statb) < 0) {
12245 if (errno == EINTR)
12248 entry->cmdtype = CMDUNKNOWN;
12252 entry->cmdtype = CMDNORMAL;
12256 /* #if ENABLE_FEATURE_SH_STANDALONE... moved after builtin check */
12258 updatetbl = (path == pathval());
12261 if (strstr(path, "%builtin") != NULL)
12262 act |= DO_ALTBLTIN;
12265 /* If name is in the table, check answer will be ok */
12266 cmdp = cmdlookup(name, 0);
12267 if (cmdp != NULL) {
12270 switch (cmdp->cmdtype) {
12288 } else if (cmdp->rehash == 0)
12289 /* if not invalidated by cd, we're done */
12293 /* If %builtin not in path, check for builtin next */
12294 bcmd = find_builtin(name);
12296 if (IS_BUILTIN_REGULAR(bcmd))
12297 goto builtin_success;
12298 if (act & DO_ALTPATH) {
12299 if (!(act & DO_ALTBLTIN))
12300 goto builtin_success;
12301 } else if (builtinloc <= 0) {
12302 goto builtin_success;
12306 #if ENABLE_FEATURE_SH_STANDALONE
12308 int applet_no = find_applet_by_name(name);
12309 if (applet_no >= 0) {
12310 entry->cmdtype = CMDNORMAL;
12311 entry->u.index = -2 - applet_no;
12317 /* We have to search path. */
12318 prev = -1; /* where to start */
12319 if (cmdp && cmdp->rehash) { /* doing a rehash */
12320 if (cmdp->cmdtype == CMDBUILTIN)
12323 prev = cmdp->param.index;
12329 while ((fullname = path_advance(&path, name)) != NULL) {
12330 stunalloc(fullname);
12331 /* NB: code below will still use fullname
12332 * despite it being "unallocated" */
12335 if (prefix(pathopt, "builtin")) {
12337 goto builtin_success;
12340 if ((act & DO_NOFUNC)
12341 || !prefix(pathopt, "func")
12342 ) { /* ignore unimplemented options */
12346 /* if rehash, don't redo absolute path names */
12347 if (fullname[0] == '/' && idx <= prev) {
12350 TRACE(("searchexec \"%s\": no change\n", name));
12353 while (stat(fullname, &statb) < 0) {
12355 if (errno == EINTR)
12358 if (errno != ENOENT && errno != ENOTDIR)
12362 e = EACCES; /* if we fail, this will be the error */
12363 if (!S_ISREG(statb.st_mode))
12365 if (pathopt) { /* this is a %func directory */
12366 stalloc(strlen(fullname) + 1);
12367 /* NB: stalloc will return space pointed by fullname
12368 * (because we don't have any intervening allocations
12369 * between stunalloc above and this stalloc) */
12370 readcmdfile(fullname);
12371 cmdp = cmdlookup(name, 0);
12372 if (cmdp == NULL || cmdp->cmdtype != CMDFUNCTION)
12373 ash_msg_and_raise_error("%s not defined in %s", name, fullname);
12374 stunalloc(fullname);
12377 TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
12379 entry->cmdtype = CMDNORMAL;
12380 entry->u.index = idx;
12384 cmdp = cmdlookup(name, 1);
12385 cmdp->cmdtype = CMDNORMAL;
12386 cmdp->param.index = idx;
12391 /* We failed. If there was an entry for this command, delete it */
12392 if (cmdp && updatetbl)
12393 delete_cmd_entry();
12395 ash_msg("%s: %s", name, errmsg(e, "not found"));
12396 entry->cmdtype = CMDUNKNOWN;
12401 entry->cmdtype = CMDBUILTIN;
12402 entry->u.cmd = bcmd;
12406 cmdp = cmdlookup(name, 1);
12407 cmdp->cmdtype = CMDBUILTIN;
12408 cmdp->param.cmd = bcmd;
12412 entry->cmdtype = cmdp->cmdtype;
12413 entry->u = cmdp->param;
12417 /* ============ trap.c */
12420 * The trap builtin.
12422 static int FAST_FUNC
12423 trapcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12427 int signo, exitcode;
12432 for (signo = 0; signo < NSIG; signo++) {
12433 char *tr = trap_ptr[signo];
12435 /* note: bash adds "SIG", but only if invoked
12436 * as "bash". If called as "sh", or if set -o posix,
12437 * then it prints short signal names.
12438 * We are printing short names: */
12439 out1fmt("trap -- %s %s\n",
12441 get_signame(signo));
12442 /* trap_ptr != trap only if we are in special-cased `trap` code.
12443 * In this case, we will exit very soon, no need to free(). */
12444 /* if (trap_ptr != trap && tp[0]) */
12449 if (trap_ptr != trap) {
12462 signo = get_signum(*ap);
12464 /* Mimic bash message exactly */
12465 ash_msg("%s: invalid signal specification", *ap);
12471 if (LONE_DASH(action))
12474 action = ckstrdup(action);
12478 may_have_traps = 1;
12479 trap[signo] = action;
12490 /* ============ Builtins */
12492 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
12494 * Lists available builtins
12496 static int FAST_FUNC
12497 helpcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12503 "Built-in commands:\n"
12504 "------------------\n");
12505 for (col = 0, i = 0; i < ARRAY_SIZE(builtintab); i++) {
12506 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '),
12507 builtintab[i].name + 1);
12513 #if ENABLE_FEATURE_SH_STANDALONE
12515 const char *a = applet_names;
12517 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '), a);
12522 a += strlen(a) + 1;
12527 return EXIT_SUCCESS;
12529 #endif /* FEATURE_SH_EXTRA_QUIET */
12532 * The export and readonly commands.
12534 static int FAST_FUNC
12535 exportcmd(int argc UNUSED_PARAM, char **argv)
12541 int flag = argv[0][0] == 'r' ? VREADONLY : VEXPORT;
12543 if (nextopt("p") != 'p') {
12548 p = strchr(name, '=');
12552 vp = *findvar(hashvar(name), name);
12558 setvar(name, p, flag);
12559 } while ((name = *++aptr) != NULL);
12563 showvars(argv[0], flag, 0);
12568 * Delete a function if it exists.
12571 unsetfunc(const char *name)
12573 struct tblentry *cmdp;
12575 cmdp = cmdlookup(name, 0);
12576 if (cmdp != NULL && cmdp->cmdtype == CMDFUNCTION)
12577 delete_cmd_entry();
12581 * The unset builtin command. We unset the function before we unset the
12582 * variable to allow a function to be unset when there is a readonly variable
12583 * with the same name.
12585 static int FAST_FUNC
12586 unsetcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12593 while ((i = nextopt("vf")) != 0) {
12597 for (ap = argptr; *ap; ap++) {
12610 static const unsigned char timescmd_str[] ALIGN1 = {
12611 ' ', offsetof(struct tms, tms_utime),
12612 '\n', offsetof(struct tms, tms_stime),
12613 ' ', offsetof(struct tms, tms_cutime),
12614 '\n', offsetof(struct tms, tms_cstime),
12617 static int FAST_FUNC
12618 timescmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12620 unsigned long clk_tck, s, t;
12621 const unsigned char *p;
12624 clk_tck = sysconf(_SC_CLK_TCK);
12629 t = *(clock_t *)(((char *) &buf) + p[1]);
12632 out1fmt("%lum%lu.%03lus%c",
12634 (t * 1000) / clk_tck,
12642 #if ENABLE_SH_MATH_SUPPORT
12644 * The let builtin. Partially stolen from GNU Bash, the Bourne Again SHell.
12645 * Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
12647 * Copyright (C) 2003 Vladimir Oleynik <dzo@simtreas.ru>
12649 static int FAST_FUNC
12650 letcmd(int argc UNUSED_PARAM, char **argv)
12656 ash_msg_and_raise_error("expression expected");
12658 i = ash_arith(*argv);
12666 * The read builtin. Options:
12667 * -r Do not interpret '\' specially
12668 * -s Turn off echo (tty only)
12669 * -n NCHARS Read NCHARS max
12670 * -p PROMPT Display PROMPT on stderr (if input is from tty)
12671 * -t SECONDS Timeout after SECONDS (tty or pipe only)
12672 * -u FD Read from given FD instead of fd 0
12673 * This uses unbuffered input, which may be avoidable in some cases.
12674 * TODO: bash also has:
12675 * -a ARRAY Read into array[0],[1],etc
12676 * -d DELIM End on DELIM char, not newline
12677 * -e Use line editing (tty only)
12679 static int FAST_FUNC
12680 readcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12682 char *opt_n = NULL;
12683 char *opt_p = NULL;
12684 char *opt_t = NULL;
12685 char *opt_u = NULL;
12686 int read_flags = 0;
12690 while ((i = nextopt("p:u:rt:n:s")) != '\0') {
12699 read_flags |= BUILTIN_READ_SILENT;
12705 read_flags |= BUILTIN_READ_RAW;
12715 r = shell_builtin_read(setvar2,
12717 bltinlookup("IFS"), /* can be NULL */
12725 if ((uintptr_t)r > 1)
12726 ash_msg_and_raise_error(r);
12728 return (uintptr_t)r;
12731 static int FAST_FUNC
12732 umaskcmd(int argc UNUSED_PARAM, char **argv)
12734 static const char permuser[3] ALIGN1 = "ugo";
12735 static const char permmode[3] ALIGN1 = "rwx";
12736 static const short permmask[] ALIGN2 = {
12737 S_IRUSR, S_IWUSR, S_IXUSR,
12738 S_IRGRP, S_IWGRP, S_IXGRP,
12739 S_IROTH, S_IWOTH, S_IXOTH
12742 /* TODO: use bb_parse_mode() instead */
12747 int symbolic_mode = 0;
12749 while (nextopt("S") != '\0') {
12760 if (symbolic_mode) {
12764 for (i = 0; i < 3; i++) {
12767 *p++ = permuser[i];
12769 for (j = 0; j < 3; j++) {
12770 if ((mask & permmask[3 * i + j]) == 0) {
12771 *p++ = permmode[j];
12779 out1fmt("%.4o\n", mask);
12782 if (isdigit((unsigned char) *ap)) {
12785 if (*ap >= '8' || *ap < '0')
12786 ash_msg_and_raise_error(msg_illnum, argv[1]);
12787 mask = (mask << 3) + (*ap - '0');
12788 } while (*++ap != '\0');
12791 mask = ~mask & 0777;
12792 if (!bb_parse_mode(ap, &mask)) {
12793 ash_msg_and_raise_error("illegal mode: %s", ap);
12795 umask(~mask & 0777);
12801 static int FAST_FUNC
12802 ulimitcmd(int argc UNUSED_PARAM, char **argv)
12804 return shell_builtin_ulimit(argv);
12807 /* ============ main() and helpers */
12810 * Called to exit the shell.
12812 static void exitshell(void) NORETURN;
12820 status = exitstatus;
12821 TRACE(("pid %d, exitshell(%d)\n", getpid(), status));
12822 if (setjmp(loc.loc)) {
12823 if (exception_type == EXEXIT)
12824 /* dash bug: it just does _exit(exitstatus) here
12825 * but we have to do setjobctl(0) first!
12826 * (bug is still not fixed in dash-0.5.3 - if you run dash
12827 * under Midnight Commander, on exit from dash MC is backgrounded) */
12828 status = exitstatus;
12831 exception_handler = &loc;
12838 flush_stdout_stderr();
12848 /* from input.c: */
12849 /* we will never free this */
12850 basepf.next_to_pgetc = basepf.buf = ckmalloc(IBUFSIZ);
12853 signal(SIGCHLD, SIG_DFL);
12854 /* bash re-enables SIGHUP which is SIG_IGNed on entry.
12855 * Try: "trap '' HUP; bash; echo RET" and type "kill -HUP $$"
12857 signal(SIGHUP, SIG_DFL);
12863 struct stat st1, st2;
12866 for (envp = environ; envp && *envp; envp++) {
12867 if (strchr(*envp, '=')) {
12868 setvareq(*envp, VEXPORT|VTEXTFIXED);
12872 setvar("PPID", utoa(getppid()), 0);
12874 p = lookupvar("PWD");
12876 if (*p != '/' || stat(p, &st1) || stat(".", &st2)
12877 || st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino)
12884 * Process the shell command line arguments.
12887 procargs(char **argv)
12890 const char *xminusc;
12895 /* if (xargv[0]) - mmm, this is always true! */
12897 for (i = 0; i < NOPTS; i++)
12901 /* it already printed err message */
12902 raise_exception(EXERROR);
12906 if (*xargv == NULL) {
12908 ash_msg_and_raise_error(bb_msg_requires_arg, "-c");
12911 if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
12915 for (i = 0; i < NOPTS; i++)
12916 if (optlist[i] == 2)
12921 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
12926 } else if (!sflag) {
12927 setinputfile(*xargv, 0);
12930 commandname = arg0;
12933 shellparam.p = xargv;
12934 #if ENABLE_ASH_GETOPTS
12935 shellparam.optind = 1;
12936 shellparam.optoff = -1;
12938 /* assert(shellparam.malloced == 0 && shellparam.nparam == 0); */
12940 shellparam.nparam++;
12947 * Read /etc/profile or .profile.
12950 read_profile(const char *name)
12954 if (setinputfile(name, INPUT_PUSH_FILE | INPUT_NOFILE_OK) < 0)
12963 * This routine is called when an error or an interrupt occurs in an
12964 * interactive shell and control is returned to the main command loop.
12972 /* from input.c: */
12973 g_parsefile->left_in_buffer = 0;
12974 g_parsefile->left_in_line = 0; /* clear input buffer */
12976 /* from parser.c: */
12979 /* from redir.c: */
12980 clearredir(/*drop:*/ 0);
12984 static short profile_buf[16384];
12985 extern int etext();
12989 * Main routine. We initialize things, parse the arguments, execute
12990 * profiles if we're a login shell, and then call cmdloop to execute
12991 * commands. The setjmp call sets up the location to jump to when an
12992 * exception occurs. When an exception occurs the variable "state"
12993 * is used to figure out how far we had gotten.
12995 int ash_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
12996 int ash_main(int argc UNUSED_PARAM, char **argv)
12998 const char *shinit;
12999 volatile smallint state;
13000 struct jmploc jmploc;
13001 struct stackmark smark;
13003 /* Initialize global data */
13007 #if ENABLE_ASH_ALIAS
13013 monitor(4, etext, profile_buf, sizeof(profile_buf), 50);
13016 #if ENABLE_FEATURE_EDITING
13017 line_input_state = new_line_input_t(FOR_SHELL | WITH_PATH_LOOKUP);
13020 if (setjmp(jmploc.loc)) {
13026 e = exception_type;
13030 if (e == EXEXIT || s == 0 || iflag == 0 || shlvl)
13033 outcslow('\n', stderr);
13035 popstackmark(&smark);
13036 FORCE_INT_ON; /* enable interrupts */
13045 exception_handler = &jmploc;
13048 TRACE(("Shell args: "));
13049 trace_puts_args(argv);
13051 rootpid = getpid();
13054 setstackmark(&smark);
13057 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
13059 const char *hp = lookupvar("HISTFILE");
13062 hp = lookupvar("HOME");
13064 char *defhp = concat_path_file(hp, ".ash_history");
13065 setvar("HISTFILE", defhp, 0);
13071 if (/* argv[0] && */ argv[0][0] == '-')
13075 read_profile("/etc/profile");
13078 read_profile(".profile");
13084 getuid() == geteuid() && getgid() == getegid() &&
13088 shinit = lookupvar("ENV");
13089 if (shinit != NULL && *shinit != '\0') {
13090 read_profile(shinit);
13096 /* evalstring pushes parsefile stack.
13097 * Ensure we don't falsely claim that 0 (stdin)
13098 * is one of stacked source fds.
13099 * Testcase: ash -c 'exec 1>&0' must not complain. */
13100 // if (!sflag) g_parsefile->pf_fd = -1;
13101 // ^^ not necessary since now we special-case fd 0
13102 // in is_hidden_fd() to not be considered "hidden fd"
13103 evalstring(minusc, 0);
13106 if (sflag || minusc == NULL) {
13107 #if defined MAX_HISTORY && MAX_HISTORY > 0 && ENABLE_FEATURE_EDITING_SAVEHISTORY
13109 const char *hp = lookupvar("HISTFILE");
13111 line_input_state->hist_file = hp;
13114 state4: /* XXX ??? - why isn't this before the "if" statement */
13122 extern void _mcleanup(void);
13132 * Copyright (c) 1989, 1991, 1993, 1994
13133 * The Regents of the University of California. All rights reserved.
13135 * This code is derived from software contributed to Berkeley by
13136 * Kenneth Almquist.
13138 * Redistribution and use in source and binary forms, with or without
13139 * modification, are permitted provided that the following conditions
13141 * 1. Redistributions of source code must retain the above copyright
13142 * notice, this list of conditions and the following disclaimer.
13143 * 2. Redistributions in binary form must reproduce the above copyright
13144 * notice, this list of conditions and the following disclaimer in the
13145 * documentation and/or other materials provided with the distribution.
13146 * 3. Neither the name of the University nor the names of its contributors
13147 * may be used to endorse or promote products derived from this software
13148 * without specific prior written permission.
13150 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
13151 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
13152 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
13153 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
13154 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
13155 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
13156 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
13157 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
13158 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
13159 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF