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) {
963 if (subtype == VSLENGTH)
974 switch (subtype & VSTYPE) {
1000 case VSTRIMRIGHTMAX:
1007 out1fmt("<subtype %d>", subtype);
1014 case CTLBACKQ|CTLQUOTE:
1017 shtree(bqlist->n, -1, NULL, fp);
1028 shcmd(union node *cmd, FILE *fp)
1036 for (np = cmd->ncmd.args; np; np = np->narg.next) {
1042 for (np = cmd->ncmd.redirect; np; np = np->nfile.next) {
1046 switch (np->nfile.type) {
1047 case NTO: s = ">>"+1; dftfd = 1; break;
1048 case NCLOBBER: s = ">|"; dftfd = 1; break;
1049 case NAPPEND: s = ">>"; dftfd = 1; break;
1050 #if ENABLE_ASH_BASH_COMPAT
1053 case NTOFD: s = ">&"; dftfd = 1; break;
1054 case NFROM: s = "<"; break;
1055 case NFROMFD: s = "<&"; break;
1056 case NFROMTO: s = "<>"; break;
1057 default: s = "*error*"; break;
1059 if (np->nfile.fd != dftfd)
1060 fprintf(fp, "%d", np->nfile.fd);
1062 if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) {
1063 fprintf(fp, "%d", np->ndup.dupfd);
1065 sharg(np->nfile.fname, fp);
1072 shtree(union node *n, int ind, char *pfx, FILE *fp)
1074 struct nodelist *lp;
1080 indent(ind, pfx, fp);
1082 if (n == NODE_EOF) {
1097 shtree(n->nbinary.ch1, ind, NULL, fp);
1100 shtree(n->nbinary.ch2, ind, NULL, fp);
1108 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
1109 shtree(lp->n, 0, NULL, fp);
1113 if (n->npipe.pipe_backgnd)
1119 fprintf(fp, "<node type %d>", n->type);
1127 showtree(union node *n)
1129 trace_puts("showtree called\n");
1130 shtree(n, 1, NULL, stderr);
1136 /* ============ Parser data */
1139 * ash_vmsg() needs parsefile->fd, hence parsefile definition is moved up.
1142 struct strlist *next;
1149 struct strpush *prev; /* preceding string on stack */
1151 int prev_left_in_line;
1152 #if ENABLE_ASH_ALIAS
1153 struct alias *ap; /* if push was associated with an alias */
1155 char *string; /* remember the string since it may change */
1159 struct parsefile *prev; /* preceding file on stack */
1160 int linno; /* current line */
1161 int pf_fd; /* file descriptor (or -1 if string) */
1162 int left_in_line; /* number of chars left in this line */
1163 int left_in_buffer; /* number of chars left in this buffer past the line */
1164 char *next_to_pgetc; /* next char in buffer */
1165 char *buf; /* input buffer */
1166 struct strpush *strpush; /* for pushing strings at this level */
1167 struct strpush basestrpush; /* so pushing one is fast */
1170 static struct parsefile basepf; /* top level input file */
1171 static struct parsefile *g_parsefile = &basepf; /* current input file */
1172 static int startlinno; /* line # where last token started */
1173 static char *commandname; /* currently executing command */
1174 static struct strlist *cmdenviron; /* environment for builtin command */
1175 static uint8_t exitstatus; /* exit status of last command */
1178 /* ============ Message printing */
1181 ash_vmsg(const char *msg, va_list ap)
1183 fprintf(stderr, "%s: ", arg0);
1185 if (strcmp(arg0, commandname))
1186 fprintf(stderr, "%s: ", commandname);
1187 if (!iflag || g_parsefile->pf_fd > 0)
1188 fprintf(stderr, "line %d: ", startlinno);
1190 vfprintf(stderr, msg, ap);
1191 outcslow('\n', stderr);
1195 * Exverror is called to raise the error exception. If the second argument
1196 * is not NULL then error prints an error message using printf style
1197 * formatting. It then raises the error exception.
1199 static void ash_vmsg_and_raise(int, const char *, va_list) NORETURN;
1201 ash_vmsg_and_raise(int cond, const char *msg, va_list ap)
1205 TRACE(("ash_vmsg_and_raise(%d, \"", cond));
1207 TRACE(("\") pid=%d\n", getpid()));
1209 TRACE(("ash_vmsg_and_raise(%d, NULL) pid=%d\n", cond, getpid()));
1214 flush_stdout_stderr();
1215 raise_exception(cond);
1219 static void ash_msg_and_raise_error(const char *, ...) NORETURN;
1221 ash_msg_and_raise_error(const char *msg, ...)
1226 ash_vmsg_and_raise(EXERROR, msg, ap);
1231 static void raise_error_syntax(const char *) NORETURN;
1233 raise_error_syntax(const char *msg)
1235 ash_msg_and_raise_error("syntax error: %s", msg);
1239 static void ash_msg_and_raise(int, const char *, ...) NORETURN;
1241 ash_msg_and_raise(int cond, const char *msg, ...)
1246 ash_vmsg_and_raise(cond, msg, ap);
1252 * error/warning routines for external builtins
1255 ash_msg(const char *fmt, ...)
1265 * Return a string describing an error. The returned string may be a
1266 * pointer to a static buffer that will be overwritten on the next call.
1267 * Action describes the operation that got the error.
1270 errmsg(int e, const char *em)
1272 if (e == ENOENT || e == ENOTDIR) {
1279 /* ============ Memory allocation */
1282 /* I consider these wrappers nearly useless:
1283 * ok, they return you to nearest exception handler, but
1284 * how much memory do you leak in the process, making
1285 * memory starvation worse?
1288 ckrealloc(void * p, size_t nbytes)
1290 p = realloc(p, nbytes);
1292 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1297 ckmalloc(size_t nbytes)
1299 return ckrealloc(NULL, nbytes);
1303 ckzalloc(size_t nbytes)
1305 return memset(ckmalloc(nbytes), 0, nbytes);
1309 ckstrdup(const char *s)
1311 char *p = strdup(s);
1313 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1317 /* Using bbox equivalents. They exit if out of memory */
1318 # define ckrealloc xrealloc
1319 # define ckmalloc xmalloc
1320 # define ckzalloc xzalloc
1321 # define ckstrdup xstrdup
1325 * It appears that grabstackstr() will barf with such alignments
1326 * because stalloc() will return a string allocated in a new stackblock.
1328 #define SHELL_ALIGN(nbytes) (((nbytes) + SHELL_SIZE) & ~SHELL_SIZE)
1330 /* Most machines require the value returned from malloc to be aligned
1331 * in some way. The following macro will get this right
1332 * on many machines. */
1333 SHELL_SIZE = sizeof(union { int i; char *cp; double d; }) - 1,
1334 /* Minimum size of a block */
1335 MINSIZE = SHELL_ALIGN(504),
1338 struct stack_block {
1339 struct stack_block *prev;
1340 char space[MINSIZE];
1344 struct stack_block *stackp;
1347 struct stackmark *marknext;
1351 struct globals_memstack {
1352 struct stack_block *g_stackp; // = &stackbase;
1353 struct stackmark *markp;
1354 char *g_stacknxt; // = stackbase.space;
1355 char *sstrend; // = stackbase.space + MINSIZE;
1356 size_t g_stacknleft; // = MINSIZE;
1357 int herefd; // = -1;
1358 struct stack_block stackbase;
1360 extern struct globals_memstack *const ash_ptr_to_globals_memstack;
1361 #define G_memstack (*ash_ptr_to_globals_memstack)
1362 #define g_stackp (G_memstack.g_stackp )
1363 #define markp (G_memstack.markp )
1364 #define g_stacknxt (G_memstack.g_stacknxt )
1365 #define sstrend (G_memstack.sstrend )
1366 #define g_stacknleft (G_memstack.g_stacknleft)
1367 #define herefd (G_memstack.herefd )
1368 #define stackbase (G_memstack.stackbase )
1369 #define INIT_G_memstack() do { \
1370 (*(struct globals_memstack**)&ash_ptr_to_globals_memstack) = xzalloc(sizeof(G_memstack)); \
1372 g_stackp = &stackbase; \
1373 g_stacknxt = stackbase.space; \
1374 g_stacknleft = MINSIZE; \
1375 sstrend = stackbase.space + MINSIZE; \
1380 #define stackblock() ((void *)g_stacknxt)
1381 #define stackblocksize() g_stacknleft
1384 * Parse trees for commands are allocated in lifo order, so we use a stack
1385 * to make this more efficient, and also to avoid all sorts of exception
1386 * handling code to handle interrupts in the middle of a parse.
1388 * The size 504 was chosen because the Ultrix malloc handles that size
1392 stalloc(size_t nbytes)
1397 aligned = SHELL_ALIGN(nbytes);
1398 if (aligned > g_stacknleft) {
1401 struct stack_block *sp;
1403 blocksize = aligned;
1404 if (blocksize < MINSIZE)
1405 blocksize = MINSIZE;
1406 len = sizeof(struct stack_block) - MINSIZE + blocksize;
1407 if (len < blocksize)
1408 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1411 sp->prev = g_stackp;
1412 g_stacknxt = sp->space;
1413 g_stacknleft = blocksize;
1414 sstrend = g_stacknxt + blocksize;
1419 g_stacknxt += aligned;
1420 g_stacknleft -= aligned;
1425 stzalloc(size_t nbytes)
1427 return memset(stalloc(nbytes), 0, nbytes);
1434 if (!p || (g_stacknxt < (char *)p) || ((char *)p < g_stackp->space)) {
1435 write(STDERR_FILENO, "stunalloc\n", 10);
1439 g_stacknleft += g_stacknxt - (char *)p;
1444 * Like strdup but works with the ash stack.
1447 ststrdup(const char *p)
1449 size_t len = strlen(p) + 1;
1450 return memcpy(stalloc(len), p, len);
1454 setstackmark(struct stackmark *mark)
1456 mark->stackp = g_stackp;
1457 mark->stacknxt = g_stacknxt;
1458 mark->stacknleft = g_stacknleft;
1459 mark->marknext = markp;
1464 popstackmark(struct stackmark *mark)
1466 struct stack_block *sp;
1472 markp = mark->marknext;
1473 while (g_stackp != mark->stackp) {
1475 g_stackp = sp->prev;
1478 g_stacknxt = mark->stacknxt;
1479 g_stacknleft = mark->stacknleft;
1480 sstrend = mark->stacknxt + mark->stacknleft;
1485 * When the parser reads in a string, it wants to stick the string on the
1486 * stack and only adjust the stack pointer when it knows how big the
1487 * string is. Stackblock (defined in stack.h) returns a pointer to a block
1488 * of space on top of the stack and stackblocklen returns the length of
1489 * this block. Growstackblock will grow this space by at least one byte,
1490 * possibly moving it (like realloc). Grabstackblock actually allocates the
1491 * part of the block that has been used.
1494 growstackblock(void)
1498 newlen = g_stacknleft * 2;
1499 if (newlen < g_stacknleft)
1500 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1504 if (g_stacknxt == g_stackp->space && g_stackp != &stackbase) {
1505 struct stack_block *oldstackp;
1506 struct stackmark *xmark;
1507 struct stack_block *sp;
1508 struct stack_block *prevstackp;
1512 oldstackp = g_stackp;
1514 prevstackp = sp->prev;
1515 grosslen = newlen + sizeof(struct stack_block) - MINSIZE;
1516 sp = ckrealloc(sp, grosslen);
1517 sp->prev = prevstackp;
1519 g_stacknxt = sp->space;
1520 g_stacknleft = newlen;
1521 sstrend = sp->space + newlen;
1524 * Stack marks pointing to the start of the old block
1525 * must be relocated to point to the new block
1528 while (xmark != NULL && xmark->stackp == oldstackp) {
1529 xmark->stackp = g_stackp;
1530 xmark->stacknxt = g_stacknxt;
1531 xmark->stacknleft = g_stacknleft;
1532 xmark = xmark->marknext;
1536 char *oldspace = g_stacknxt;
1537 size_t oldlen = g_stacknleft;
1538 char *p = stalloc(newlen);
1540 /* free the space we just allocated */
1541 g_stacknxt = memcpy(p, oldspace, oldlen);
1542 g_stacknleft += newlen;
1547 grabstackblock(size_t len)
1549 len = SHELL_ALIGN(len);
1551 g_stacknleft -= len;
1555 * The following routines are somewhat easier to use than the above.
1556 * The user declares a variable of type STACKSTR, which may be declared
1557 * to be a register. The macro STARTSTACKSTR initializes things. Then
1558 * the user uses the macro STPUTC to add characters to the string. In
1559 * effect, STPUTC(c, p) is the same as *p++ = c except that the stack is
1560 * grown as necessary. When the user is done, she can just leave the
1561 * string there and refer to it using stackblock(). Or she can allocate
1562 * the space for it using grabstackstr(). If it is necessary to allow
1563 * someone else to use the stack temporarily and then continue to grow
1564 * the string, the user should use grabstack to allocate the space, and
1565 * then call ungrabstr(p) to return to the previous mode of operation.
1567 * USTPUTC is like STPUTC except that it doesn't check for overflow.
1568 * CHECKSTACKSPACE can be called before USTPUTC to ensure that there
1569 * is space for at least one character.
1574 size_t len = stackblocksize();
1575 if (herefd >= 0 && len >= 1024) {
1576 full_write(herefd, stackblock(), len);
1577 return stackblock();
1580 return (char *)stackblock() + len;
1584 * Called from CHECKSTRSPACE.
1587 makestrspace(size_t newlen, char *p)
1589 size_t len = p - g_stacknxt;
1590 size_t size = stackblocksize();
1595 size = stackblocksize();
1597 if (nleft >= newlen)
1601 return (char *)stackblock() + len;
1605 stack_nputstr(const char *s, size_t n, char *p)
1607 p = makestrspace(n, p);
1608 p = (char *)memcpy(p, s, n) + n;
1613 stack_putstr(const char *s, char *p)
1615 return stack_nputstr(s, strlen(s), p);
1619 _STPUTC(int c, char *p)
1627 #define STARTSTACKSTR(p) ((p) = stackblock())
1628 #define STPUTC(c, p) ((p) = _STPUTC((c), (p)))
1629 #define CHECKSTRSPACE(n, p) do { \
1632 size_t m = sstrend - q; \
1634 (p) = makestrspace(l, q); \
1636 #define USTPUTC(c, p) (*(p)++ = (c))
1637 #define STACKSTRNUL(p) do { \
1638 if ((p) == sstrend) \
1639 (p) = growstackstr(); \
1642 #define STUNPUTC(p) (--(p))
1643 #define STTOPC(p) ((p)[-1])
1644 #define STADJUST(amount, p) ((p) += (amount))
1646 #define grabstackstr(p) stalloc((char *)(p) - (char *)stackblock())
1647 #define ungrabstackstr(s, p) stunalloc(s)
1648 #define stackstrend() ((void *)sstrend)
1651 /* ============ String helpers */
1654 * prefix -- see if pfx is a prefix of string.
1657 prefix(const char *string, const char *pfx)
1660 if (*pfx++ != *string++)
1663 return (char *) string;
1667 * Check for a valid number. This should be elsewhere.
1670 is_number(const char *p)
1675 } while (*++p != '\0');
1680 * Convert a string of digits to an integer, printing an error message on
1684 number(const char *s)
1687 ash_msg_and_raise_error(msg_illnum, s);
1692 * Produce a possibly single quoted string suitable as input to the shell.
1693 * The return string is allocated on the stack.
1696 single_quote(const char *s)
1706 len = strchrnul(s, '\'') - s;
1708 q = p = makestrspace(len + 3, p);
1711 q = (char *)memcpy(q, s, len) + len;
1720 do len++; while (*++s == '\'');
1722 q = p = makestrspace(len + 3, p);
1725 q = (char *)memcpy(q, s - len, len) + len;
1733 return stackblock();
1737 /* ============ nextopt */
1739 static char **argptr; /* argument list for builtin commands */
1740 static char *optionarg; /* set by nextopt (like getopt) */
1741 static char *optptr; /* used by nextopt */
1744 * XXX - should get rid of. Have all builtins use getopt(3).
1745 * The library getopt must have the BSD extension static variable
1746 * "optreset", otherwise it can't be used within the shell safely.
1748 * Standard option processing (a la getopt) for builtin routines.
1749 * The only argument that is passed to nextopt is the option string;
1750 * the other arguments are unnecessary. It returns the character,
1751 * or '\0' on end of input.
1754 nextopt(const char *optstring)
1761 if (p == NULL || *p == '\0') {
1762 /* We ate entire "-param", take next one */
1768 if (*++p == '\0') /* just "-" ? */
1771 if (LONE_DASH(p)) /* "--" ? */
1773 /* p => next "-param" */
1775 /* p => some option char in the middle of a "-param" */
1777 for (q = optstring; *q != c;) {
1779 ash_msg_and_raise_error("illegal option -%c", c);
1787 ash_msg_and_raise_error("no arg for -%c option", c);
1797 /* ============ Shell variables */
1800 * The parsefile structure pointed to by the global variable parsefile
1801 * contains information about the current file being read.
1804 int nparam; /* # of positional parameters (without $0) */
1805 #if ENABLE_ASH_GETOPTS
1806 int optind; /* next parameter to be processed by getopts */
1807 int optoff; /* used by getopts */
1809 unsigned char malloced; /* if parameter list dynamically allocated */
1810 char **p; /* parameter list */
1814 * Free the list of positional parameters.
1817 freeparam(volatile struct shparam *param)
1819 if (param->malloced) {
1821 ap = ap1 = param->p;
1828 #if ENABLE_ASH_GETOPTS
1829 static void FAST_FUNC getoptsreset(const char *value);
1833 struct var *next; /* next entry in hash list */
1834 int flags; /* flags are defined above */
1835 const char *var_text; /* name=value */
1836 void (*var_func)(const char *) FAST_FUNC; /* function to be called when */
1837 /* the variable gets set/unset */
1841 struct localvar *next; /* next local variable in list */
1842 struct var *vp; /* the variable that was made local */
1843 int flags; /* saved flags */
1844 const char *text; /* saved text */
1848 #define VEXPORT 0x01 /* variable is exported */
1849 #define VREADONLY 0x02 /* variable cannot be modified */
1850 #define VSTRFIXED 0x04 /* variable struct is statically allocated */
1851 #define VTEXTFIXED 0x08 /* text is statically allocated */
1852 #define VSTACK 0x10 /* text is allocated on the stack */
1853 #define VUNSET 0x20 /* the variable is not set */
1854 #define VNOFUNC 0x40 /* don't call the callback function */
1855 #define VNOSET 0x80 /* do not set variable - just readonly test */
1856 #define VNOSAVE 0x100 /* when text is on the heap before setvareq */
1857 #if ENABLE_ASH_RANDOM_SUPPORT
1858 # define VDYNAMIC 0x200 /* dynamic variable */
1864 /* Need to be before varinit_data[] */
1865 #if ENABLE_LOCALE_SUPPORT
1866 static void FAST_FUNC
1867 change_lc_all(const char *value)
1869 if (value && *value != '\0')
1870 setlocale(LC_ALL, value);
1872 static void FAST_FUNC
1873 change_lc_ctype(const char *value)
1875 if (value && *value != '\0')
1876 setlocale(LC_CTYPE, value);
1880 static void chkmail(void);
1881 static void changemail(const char *) FAST_FUNC;
1883 static void changepath(const char *) FAST_FUNC;
1884 #if ENABLE_ASH_RANDOM_SUPPORT
1885 static void change_random(const char *) FAST_FUNC;
1888 static const struct {
1890 const char *var_text;
1891 void (*var_func)(const char *) FAST_FUNC;
1892 } varinit_data[] = {
1893 { VSTRFIXED|VTEXTFIXED , defifsvar , NULL },
1895 { VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL" , changemail },
1896 { VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH" , changemail },
1898 { VSTRFIXED|VTEXTFIXED , bb_PATH_root_path, changepath },
1899 { VSTRFIXED|VTEXTFIXED , "PS1=$ " , NULL },
1900 { VSTRFIXED|VTEXTFIXED , "PS2=> " , NULL },
1901 { VSTRFIXED|VTEXTFIXED , "PS4=+ " , NULL },
1902 #if ENABLE_ASH_GETOPTS
1903 { VSTRFIXED|VTEXTFIXED , "OPTIND=1" , getoptsreset },
1905 #if ENABLE_ASH_RANDOM_SUPPORT
1906 { VSTRFIXED|VTEXTFIXED|VUNSET|VDYNAMIC, "RANDOM", change_random },
1908 #if ENABLE_LOCALE_SUPPORT
1909 { VSTRFIXED|VTEXTFIXED|VUNSET, "LC_ALL" , change_lc_all },
1910 { VSTRFIXED|VTEXTFIXED|VUNSET, "LC_CTYPE" , change_lc_ctype },
1912 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
1913 { VSTRFIXED|VTEXTFIXED|VUNSET, "HISTFILE" , NULL },
1919 struct globals_var {
1920 struct shparam shellparam; /* $@ current positional parameters */
1921 struct redirtab *redirlist;
1923 int preverrout_fd; /* save fd2 before print debug if xflag is set. */
1924 struct var *vartab[VTABSIZE];
1925 struct var varinit[ARRAY_SIZE(varinit_data)];
1927 extern struct globals_var *const ash_ptr_to_globals_var;
1928 #define G_var (*ash_ptr_to_globals_var)
1929 #define shellparam (G_var.shellparam )
1930 //#define redirlist (G_var.redirlist )
1931 #define g_nullredirs (G_var.g_nullredirs )
1932 #define preverrout_fd (G_var.preverrout_fd)
1933 #define vartab (G_var.vartab )
1934 #define varinit (G_var.varinit )
1935 #define INIT_G_var() do { \
1937 (*(struct globals_var**)&ash_ptr_to_globals_var) = xzalloc(sizeof(G_var)); \
1939 for (i = 0; i < ARRAY_SIZE(varinit_data); i++) { \
1940 varinit[i].flags = varinit_data[i].flags; \
1941 varinit[i].var_text = varinit_data[i].var_text; \
1942 varinit[i].var_func = varinit_data[i].var_func; \
1946 #define vifs varinit[0]
1948 # define vmail (&vifs)[1]
1949 # define vmpath (&vmail)[1]
1950 # define vpath (&vmpath)[1]
1952 # define vpath (&vifs)[1]
1954 #define vps1 (&vpath)[1]
1955 #define vps2 (&vps1)[1]
1956 #define vps4 (&vps2)[1]
1957 #if ENABLE_ASH_GETOPTS
1958 # define voptind (&vps4)[1]
1959 # if ENABLE_ASH_RANDOM_SUPPORT
1960 # define vrandom (&voptind)[1]
1963 # if ENABLE_ASH_RANDOM_SUPPORT
1964 # define vrandom (&vps4)[1]
1969 * The following macros access the values of the above variables.
1970 * They have to skip over the name. They return the null string
1971 * for unset variables.
1973 #define ifsval() (vifs.var_text + 4)
1974 #define ifsset() ((vifs.flags & VUNSET) == 0)
1976 # define mailval() (vmail.var_text + 5)
1977 # define mpathval() (vmpath.var_text + 9)
1978 # define mpathset() ((vmpath.flags & VUNSET) == 0)
1980 #define pathval() (vpath.var_text + 5)
1981 #define ps1val() (vps1.var_text + 4)
1982 #define ps2val() (vps2.var_text + 4)
1983 #define ps4val() (vps4.var_text + 4)
1984 #if ENABLE_ASH_GETOPTS
1985 # define optindval() (voptind.var_text + 7)
1988 #if ENABLE_ASH_GETOPTS
1989 static void FAST_FUNC
1990 getoptsreset(const char *value)
1992 shellparam.optind = number(value);
1993 shellparam.optoff = -1;
1997 /* math.h has these, otherwise define our private copies */
1998 #if !ENABLE_SH_MATH_SUPPORT
1999 #define is_name(c) ((c) == '_' || isalpha((unsigned char)(c)))
2000 #define is_in_name(c) ((c) == '_' || isalnum((unsigned char)(c)))
2002 * Return the pointer to the first char which is not part of a legal variable name
2003 * (a letter or underscore followed by letters, underscores, and digits).
2006 endofname(const char *name)
2008 if (!is_name(*name))
2011 if (!is_in_name(*name))
2019 * Compares two strings up to the first = or '\0'. The first
2020 * string must be terminated by '='; the second may be terminated by
2021 * either '=' or '\0'.
2024 varcmp(const char *p, const char *q)
2028 while ((c = *p) == (d = *q)) {
2043 * Find the appropriate entry in the hash table from the name.
2045 static struct var **
2046 hashvar(const char *p)
2050 hashval = ((unsigned char) *p) << 4;
2051 while (*p && *p != '=')
2052 hashval += (unsigned char) *p++;
2053 return &vartab[hashval % VTABSIZE];
2057 vpcmp(const void *a, const void *b)
2059 return varcmp(*(const char **)a, *(const char **)b);
2063 * This routine initializes the builtin variables.
2073 * PS1 depends on uid
2075 #if ENABLE_FEATURE_EDITING && ENABLE_FEATURE_EDITING_FANCY_PROMPT
2076 vps1.var_text = "PS1=\\w \\$ ";
2079 vps1.var_text = "PS1=# ";
2082 end = vp + ARRAY_SIZE(varinit);
2084 vpp = hashvar(vp->var_text);
2087 } while (++vp < end);
2090 static struct var **
2091 findvar(struct var **vpp, const char *name)
2093 for (; *vpp; vpp = &(*vpp)->next) {
2094 if (varcmp((*vpp)->var_text, name) == 0) {
2102 * Find the value of a variable. Returns NULL if not set.
2104 static const char* FAST_FUNC
2105 lookupvar(const char *name)
2109 v = *findvar(hashvar(name), name);
2111 #if ENABLE_ASH_RANDOM_SUPPORT
2113 * Dynamic variables are implemented roughly the same way they are
2114 * in bash. Namely, they're "special" so long as they aren't unset.
2115 * As soon as they're unset, they're no longer dynamic, and dynamic
2116 * lookup will no longer happen at that point. -- PFM.
2118 if (v->flags & VDYNAMIC)
2121 if (!(v->flags & VUNSET))
2122 return var_end(v->var_text);
2128 * Search the environment of a builtin command.
2131 bltinlookup(const char *name)
2135 for (sp = cmdenviron; sp; sp = sp->next) {
2136 if (varcmp(sp->text, name) == 0)
2137 return var_end(sp->text);
2139 return lookupvar(name);
2143 * Same as setvar except that the variable and value are passed in
2144 * the first argument as name=value. Since the first argument will
2145 * be actually stored in the table, it should not be a string that
2147 * Called with interrupts off.
2150 setvareq(char *s, int flags)
2152 struct var *vp, **vpp;
2155 flags |= (VEXPORT & (((unsigned) (1 - aflag)) - 1));
2156 vp = *findvar(vpp, s);
2158 if ((vp->flags & (VREADONLY|VDYNAMIC)) == VREADONLY) {
2161 if (flags & VNOSAVE)
2164 ash_msg_and_raise_error("%.*s: is read only", strchrnul(n, '=') - n, n);
2170 if (vp->var_func && !(flags & VNOFUNC))
2171 vp->var_func(var_end(s));
2173 if (!(vp->flags & (VTEXTFIXED|VSTACK)))
2174 free((char*)vp->var_text);
2176 flags |= vp->flags & ~(VTEXTFIXED|VSTACK|VNOSAVE|VUNSET);
2178 /* variable s is not found */
2181 vp = ckzalloc(sizeof(*vp));
2183 /*vp->func = NULL; - ckzalloc did it */
2186 if (!(flags & (VTEXTFIXED|VSTACK|VNOSAVE)))
2193 * Set the value of a variable. The flags argument is ored with the
2194 * flags of the variable. If val is NULL, the variable is unset.
2197 setvar(const char *name, const char *val, int flags)
2205 q = endofname(name);
2206 p = strchrnul(q, '=');
2208 if (!namelen || p != q)
2209 ash_msg_and_raise_error("%.*s: bad variable name", namelen, name);
2214 vallen = strlen(val);
2218 nameeq = ckmalloc(namelen + vallen + 2);
2219 p = memcpy(nameeq, name, namelen) + namelen;
2222 p = memcpy(p, val, vallen) + vallen;
2225 setvareq(nameeq, flags | VNOSAVE);
2229 static void FAST_FUNC
2230 setvar2(const char *name, const char *val)
2232 setvar(name, val, 0);
2235 #if ENABLE_ASH_GETOPTS
2237 * Safe version of setvar, returns 1 on success 0 on failure.
2240 setvarsafe(const char *name, const char *val, int flags)
2243 volatile int saveint;
2244 struct jmploc *volatile savehandler = exception_handler;
2245 struct jmploc jmploc;
2248 if (setjmp(jmploc.loc))
2251 exception_handler = &jmploc;
2252 setvar(name, val, flags);
2255 exception_handler = savehandler;
2256 RESTORE_INT(saveint);
2262 * Unset the specified variable.
2265 unsetvar(const char *s)
2271 vpp = findvar(hashvar(s), s);
2275 int flags = vp->flags;
2278 if (flags & VREADONLY)
2280 #if ENABLE_ASH_RANDOM_SUPPORT
2281 vp->flags &= ~VDYNAMIC;
2285 if ((flags & VSTRFIXED) == 0) {
2287 if ((flags & (VTEXTFIXED|VSTACK)) == 0)
2288 free((char*)vp->var_text);
2294 vp->flags &= ~VEXPORT;
2304 * Process a linked list of variable assignments.
2307 listsetvar(struct strlist *list_set_var, int flags)
2309 struct strlist *lp = list_set_var;
2315 setvareq(lp->text, flags);
2322 * Generate a list of variables satisfying the given conditions.
2325 listvars(int on, int off, char ***end)
2336 for (vp = *vpp; vp; vp = vp->next) {
2337 if ((vp->flags & mask) == on) {
2338 if (ep == stackstrend())
2339 ep = growstackstr();
2340 *ep++ = (char*)vp->var_text;
2343 } while (++vpp < vartab + VTABSIZE);
2344 if (ep == stackstrend())
2345 ep = growstackstr();
2349 return grabstackstr(ep);
2353 /* ============ Path search helper
2355 * The variable path (passed by reference) should be set to the start
2356 * of the path before the first call; path_advance will update
2357 * this value as it proceeds. Successive calls to path_advance will return
2358 * the possible path expansions in sequence. If an option (indicated by
2359 * a percent sign) appears in the path entry then the global variable
2360 * pathopt will be set to point to it; otherwise pathopt will be set to
2363 static const char *pathopt; /* set by path_advance */
2366 path_advance(const char **path, const char *name)
2376 for (p = start; *p && *p != ':' && *p != '%'; p++)
2378 len = p - start + strlen(name) + 2; /* "2" is for '/' and '\0' */
2379 while (stackblocksize() < len)
2383 memcpy(q, start, p - start);
2391 while (*p && *p != ':')
2398 return stalloc(len);
2402 /* ============ Prompt */
2404 static smallint doprompt; /* if set, prompt the user */
2405 static smallint needprompt; /* true if interactive and at start of line */
2407 #if ENABLE_FEATURE_EDITING
2408 static line_input_t *line_input_state;
2409 static const char *cmdedit_prompt;
2411 putprompt(const char *s)
2413 if (ENABLE_ASH_EXPAND_PRMT) {
2414 free((char*)cmdedit_prompt);
2415 cmdedit_prompt = ckstrdup(s);
2422 putprompt(const char *s)
2428 #if ENABLE_ASH_EXPAND_PRMT
2429 /* expandstr() needs parsing machinery, so it is far away ahead... */
2430 static const char *expandstr(const char *ps);
2432 #define expandstr(s) s
2436 setprompt(int whichprompt)
2439 #if ENABLE_ASH_EXPAND_PRMT
2440 struct stackmark smark;
2445 switch (whichprompt) {
2455 #if ENABLE_ASH_EXPAND_PRMT
2456 setstackmark(&smark);
2457 stalloc(stackblocksize());
2459 putprompt(expandstr(prompt));
2460 #if ENABLE_ASH_EXPAND_PRMT
2461 popstackmark(&smark);
2466 /* ============ The cd and pwd commands */
2468 #define CD_PHYSICAL 1
2478 while ((i = nextopt("LP")) != '\0') {
2480 flags ^= CD_PHYSICAL;
2489 * Update curdir (the name of the current directory) in response to a
2493 updatepwd(const char *dir)
2500 cdcomppath = ststrdup(dir);
2503 if (curdir == nullstr)
2505 new = stack_putstr(curdir, new);
2507 new = makestrspace(strlen(dir) + 2, new);
2508 lim = (char *)stackblock() + 1;
2512 if (new > lim && *lim == '/')
2517 if (dir[1] == '/' && dir[2] != '/') {
2523 p = strtok(cdcomppath, "/");
2527 if (p[1] == '.' && p[2] == '\0') {
2539 new = stack_putstr(p, new);
2547 return stackblock();
2551 * Find out what the current directory is. If we already know the current
2552 * directory, this routine returns immediately.
2557 char *dir = getcwd(NULL, 0); /* huh, using glibc extension? */
2558 return dir ? dir : nullstr;
2562 setpwd(const char *val, int setold)
2566 oldcur = dir = curdir;
2569 setvar("OLDPWD", oldcur, VEXPORT);
2572 if (physdir != nullstr) {
2573 if (physdir != oldcur)
2577 if (oldcur == val || !val) {
2583 dir = ckstrdup(val);
2584 if (oldcur != dir && oldcur != nullstr) {
2589 setvar("PWD", dir, VEXPORT);
2592 static void hashcd(void);
2595 * Actually do the chdir. We also call hashcd to let the routines in exec.c
2596 * know that the current directory has changed.
2599 docd(const char *dest, int flags)
2601 const char *dir = NULL;
2604 TRACE(("docd(\"%s\", %d) called\n", dest, flags));
2607 if (!(flags & CD_PHYSICAL)) {
2608 dir = updatepwd(dest);
2622 static int FAST_FUNC
2623 cdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
2635 dest = bltinlookup("HOME");
2636 else if (LONE_DASH(dest)) {
2637 dest = bltinlookup("OLDPWD");
2659 path = bltinlookup("CDPATH");
2668 p = path_advance(&path, dest);
2669 if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
2673 if (!docd(p, flags))
2678 ash_msg_and_raise_error("can't cd to %s", dest);
2681 if (flags & CD_PRINT)
2682 out1fmt("%s\n", curdir);
2686 static int FAST_FUNC
2687 pwdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
2690 const char *dir = curdir;
2694 if (physdir == nullstr)
2698 out1fmt("%s\n", dir);
2703 /* ============ ... */
2706 #define IBUFSIZ (ENABLE_FEATURE_EDITING ? CONFIG_FEATURE_EDITING_MAX_LEN : 1024)
2708 /* Syntax classes */
2709 #define CWORD 0 /* character is nothing special */
2710 #define CNL 1 /* newline character */
2711 #define CBACK 2 /* a backslash character */
2712 #define CSQUOTE 3 /* single quote */
2713 #define CDQUOTE 4 /* double quote */
2714 #define CENDQUOTE 5 /* a terminating quote */
2715 #define CBQUOTE 6 /* backwards single quote */
2716 #define CVAR 7 /* a dollar sign */
2717 #define CENDVAR 8 /* a '}' character */
2718 #define CLP 9 /* a left paren in arithmetic */
2719 #define CRP 10 /* a right paren in arithmetic */
2720 #define CENDFILE 11 /* end of file */
2721 #define CCTL 12 /* like CWORD, except it must be escaped */
2722 #define CSPCL 13 /* these terminate a word */
2723 #define CIGN 14 /* character should be ignored */
2726 #if ENABLE_ASH_ALIAS
2730 #define USE_SIT_FUNCTION ENABLE_ASH_OPTIMIZE_FOR_SIZE
2732 #if ENABLE_SH_MATH_SUPPORT
2733 # define SIT_ITEM(a,b,c,d) (a | (b << 4) | (c << 8) | (d << 12))
2735 # define SIT_ITEM(a,b,c,d) (a | (b << 4) | (c << 8))
2737 static const uint16_t S_I_T[] = {
2738 #if ENABLE_ASH_ALIAS
2739 SIT_ITEM(CSPCL , CIGN , CIGN , CIGN ), /* 0, PEOA */
2741 SIT_ITEM(CSPCL , CWORD , CWORD, CWORD ), /* 1, ' ' */
2742 SIT_ITEM(CNL , CNL , CNL , CNL ), /* 2, \n */
2743 SIT_ITEM(CWORD , CCTL , CCTL , CWORD ), /* 3, !*-/:=?[]~ */
2744 SIT_ITEM(CDQUOTE , CENDQUOTE, CWORD, CWORD ), /* 4, '"' */
2745 SIT_ITEM(CVAR , CVAR , CWORD, CVAR ), /* 5, $ */
2746 SIT_ITEM(CSQUOTE , CWORD , CENDQUOTE, CWORD), /* 6, "'" */
2747 SIT_ITEM(CSPCL , CWORD , CWORD, CLP ), /* 7, ( */
2748 SIT_ITEM(CSPCL , CWORD , CWORD, CRP ), /* 8, ) */
2749 SIT_ITEM(CBACK , CBACK , CCTL , CBACK ), /* 9, \ */
2750 SIT_ITEM(CBQUOTE , CBQUOTE , CWORD, CBQUOTE), /* 10, ` */
2751 SIT_ITEM(CENDVAR , CENDVAR , CWORD, CENDVAR), /* 11, } */
2752 #if !USE_SIT_FUNCTION
2753 SIT_ITEM(CENDFILE, CENDFILE , CENDFILE, CENDFILE),/* 12, PEOF */
2754 SIT_ITEM(CWORD , CWORD , CWORD, CWORD ), /* 13, 0-9A-Za-z */
2755 SIT_ITEM(CCTL , CCTL , CCTL , CCTL ) /* 14, CTLESC ... */
2759 /* Constants below must match table above */
2761 #if ENABLE_ASH_ALIAS
2762 CSPCL_CIGN_CIGN_CIGN , /* 0 */
2764 CSPCL_CWORD_CWORD_CWORD , /* 1 */
2765 CNL_CNL_CNL_CNL , /* 2 */
2766 CWORD_CCTL_CCTL_CWORD , /* 3 */
2767 CDQUOTE_CENDQUOTE_CWORD_CWORD , /* 4 */
2768 CVAR_CVAR_CWORD_CVAR , /* 5 */
2769 CSQUOTE_CWORD_CENDQUOTE_CWORD , /* 6 */
2770 CSPCL_CWORD_CWORD_CLP , /* 7 */
2771 CSPCL_CWORD_CWORD_CRP , /* 8 */
2772 CBACK_CBACK_CCTL_CBACK , /* 9 */
2773 CBQUOTE_CBQUOTE_CWORD_CBQUOTE , /* 10 */
2774 CENDVAR_CENDVAR_CWORD_CENDVAR , /* 11 */
2775 CENDFILE_CENDFILE_CENDFILE_CENDFILE, /* 12 */
2776 CWORD_CWORD_CWORD_CWORD , /* 13 */
2777 CCTL_CCTL_CCTL_CCTL , /* 14 */
2780 /* c in SIT(c, syntax) must be an *unsigned char* or PEOA or PEOF,
2781 * caller must ensure proper cast on it if c is *char_ptr!
2783 /* Values for syntax param */
2784 #define BASESYNTAX 0 /* not in quotes */
2785 #define DQSYNTAX 1 /* in double quotes */
2786 #define SQSYNTAX 2 /* in single quotes */
2787 #define ARISYNTAX 3 /* in arithmetic */
2788 #define PSSYNTAX 4 /* prompt. never passed to SIT() */
2790 #if USE_SIT_FUNCTION
2793 SIT(int c, int syntax)
2795 static const char spec_symbls[] ALIGN1 = "\t\n !\"$&'()*-/:;<=>?[\\]`|}~";
2796 # if ENABLE_ASH_ALIAS
2797 static const uint8_t syntax_index_table[] ALIGN1 = {
2798 1, 2, 1, 3, 4, 5, 1, 6, /* "\t\n !\"$&'" */
2799 7, 8, 3, 3, 3, 3, 1, 1, /* "()*-/:;<" */
2800 3, 1, 3, 3, 9, 3, 10, 1, /* "=>?[\\]`|" */
2804 static const uint8_t syntax_index_table[] ALIGN1 = {
2805 0, 1, 0, 2, 3, 4, 0, 5, /* "\t\n !\"$&'" */
2806 6, 7, 2, 2, 2, 2, 0, 0, /* "()*-/:;<" */
2807 2, 0, 2, 2, 8, 2, 9, 0, /* "=>?[\\]`|" */
2816 # if ENABLE_ASH_ALIAS
2822 /* Cast is purely for paranoia here,
2823 * just in case someone passed signed char to us */
2824 if ((unsigned char)c >= CTL_FIRST
2825 && (unsigned char)c <= CTL_LAST
2829 s = strchrnul(spec_symbls, c);
2832 indx = syntax_index_table[s - spec_symbls];
2834 return (S_I_T[indx] >> (syntax*4)) & 0xf;
2837 #else /* !USE_SIT_FUNCTION */
2839 static const uint8_t syntax_index_table[] = {
2840 /* BASESYNTAX_DQSYNTAX_SQSYNTAX_ARISYNTAX */
2841 /* 0 */ CWORD_CWORD_CWORD_CWORD,
2842 /* 1 */ CWORD_CWORD_CWORD_CWORD,
2843 /* 2 */ CWORD_CWORD_CWORD_CWORD,
2844 /* 3 */ CWORD_CWORD_CWORD_CWORD,
2845 /* 4 */ CWORD_CWORD_CWORD_CWORD,
2846 /* 5 */ CWORD_CWORD_CWORD_CWORD,
2847 /* 6 */ CWORD_CWORD_CWORD_CWORD,
2848 /* 7 */ CWORD_CWORD_CWORD_CWORD,
2849 /* 8 */ CWORD_CWORD_CWORD_CWORD,
2850 /* 9 "\t" */ CSPCL_CWORD_CWORD_CWORD,
2851 /* 10 "\n" */ CNL_CNL_CNL_CNL,
2852 /* 11 */ CWORD_CWORD_CWORD_CWORD,
2853 /* 12 */ CWORD_CWORD_CWORD_CWORD,
2854 /* 13 */ CWORD_CWORD_CWORD_CWORD,
2855 /* 14 */ CWORD_CWORD_CWORD_CWORD,
2856 /* 15 */ CWORD_CWORD_CWORD_CWORD,
2857 /* 16 */ CWORD_CWORD_CWORD_CWORD,
2858 /* 17 */ CWORD_CWORD_CWORD_CWORD,
2859 /* 18 */ CWORD_CWORD_CWORD_CWORD,
2860 /* 19 */ CWORD_CWORD_CWORD_CWORD,
2861 /* 20 */ CWORD_CWORD_CWORD_CWORD,
2862 /* 21 */ CWORD_CWORD_CWORD_CWORD,
2863 /* 22 */ CWORD_CWORD_CWORD_CWORD,
2864 /* 23 */ CWORD_CWORD_CWORD_CWORD,
2865 /* 24 */ CWORD_CWORD_CWORD_CWORD,
2866 /* 25 */ CWORD_CWORD_CWORD_CWORD,
2867 /* 26 */ CWORD_CWORD_CWORD_CWORD,
2868 /* 27 */ CWORD_CWORD_CWORD_CWORD,
2869 /* 28 */ CWORD_CWORD_CWORD_CWORD,
2870 /* 29 */ CWORD_CWORD_CWORD_CWORD,
2871 /* 30 */ CWORD_CWORD_CWORD_CWORD,
2872 /* 31 */ CWORD_CWORD_CWORD_CWORD,
2873 /* 32 " " */ CSPCL_CWORD_CWORD_CWORD,
2874 /* 33 "!" */ CWORD_CCTL_CCTL_CWORD,
2875 /* 34 """ */ CDQUOTE_CENDQUOTE_CWORD_CWORD,
2876 /* 35 "#" */ CWORD_CWORD_CWORD_CWORD,
2877 /* 36 "$" */ CVAR_CVAR_CWORD_CVAR,
2878 /* 37 "%" */ CWORD_CWORD_CWORD_CWORD,
2879 /* 38 "&" */ CSPCL_CWORD_CWORD_CWORD,
2880 /* 39 "'" */ CSQUOTE_CWORD_CENDQUOTE_CWORD,
2881 /* 40 "(" */ CSPCL_CWORD_CWORD_CLP,
2882 /* 41 ")" */ CSPCL_CWORD_CWORD_CRP,
2883 /* 42 "*" */ CWORD_CCTL_CCTL_CWORD,
2884 /* 43 "+" */ CWORD_CWORD_CWORD_CWORD,
2885 /* 44 "," */ CWORD_CWORD_CWORD_CWORD,
2886 /* 45 "-" */ CWORD_CCTL_CCTL_CWORD,
2887 /* 46 "." */ CWORD_CWORD_CWORD_CWORD,
2888 /* 47 "/" */ CWORD_CCTL_CCTL_CWORD,
2889 /* 48 "0" */ CWORD_CWORD_CWORD_CWORD,
2890 /* 49 "1" */ CWORD_CWORD_CWORD_CWORD,
2891 /* 50 "2" */ CWORD_CWORD_CWORD_CWORD,
2892 /* 51 "3" */ CWORD_CWORD_CWORD_CWORD,
2893 /* 52 "4" */ CWORD_CWORD_CWORD_CWORD,
2894 /* 53 "5" */ CWORD_CWORD_CWORD_CWORD,
2895 /* 54 "6" */ CWORD_CWORD_CWORD_CWORD,
2896 /* 55 "7" */ CWORD_CWORD_CWORD_CWORD,
2897 /* 56 "8" */ CWORD_CWORD_CWORD_CWORD,
2898 /* 57 "9" */ CWORD_CWORD_CWORD_CWORD,
2899 /* 58 ":" */ CWORD_CCTL_CCTL_CWORD,
2900 /* 59 ";" */ CSPCL_CWORD_CWORD_CWORD,
2901 /* 60 "<" */ CSPCL_CWORD_CWORD_CWORD,
2902 /* 61 "=" */ CWORD_CCTL_CCTL_CWORD,
2903 /* 62 ">" */ CSPCL_CWORD_CWORD_CWORD,
2904 /* 63 "?" */ CWORD_CCTL_CCTL_CWORD,
2905 /* 64 "@" */ CWORD_CWORD_CWORD_CWORD,
2906 /* 65 "A" */ CWORD_CWORD_CWORD_CWORD,
2907 /* 66 "B" */ CWORD_CWORD_CWORD_CWORD,
2908 /* 67 "C" */ CWORD_CWORD_CWORD_CWORD,
2909 /* 68 "D" */ CWORD_CWORD_CWORD_CWORD,
2910 /* 69 "E" */ CWORD_CWORD_CWORD_CWORD,
2911 /* 70 "F" */ CWORD_CWORD_CWORD_CWORD,
2912 /* 71 "G" */ CWORD_CWORD_CWORD_CWORD,
2913 /* 72 "H" */ CWORD_CWORD_CWORD_CWORD,
2914 /* 73 "I" */ CWORD_CWORD_CWORD_CWORD,
2915 /* 74 "J" */ CWORD_CWORD_CWORD_CWORD,
2916 /* 75 "K" */ CWORD_CWORD_CWORD_CWORD,
2917 /* 76 "L" */ CWORD_CWORD_CWORD_CWORD,
2918 /* 77 "M" */ CWORD_CWORD_CWORD_CWORD,
2919 /* 78 "N" */ CWORD_CWORD_CWORD_CWORD,
2920 /* 79 "O" */ CWORD_CWORD_CWORD_CWORD,
2921 /* 80 "P" */ CWORD_CWORD_CWORD_CWORD,
2922 /* 81 "Q" */ CWORD_CWORD_CWORD_CWORD,
2923 /* 82 "R" */ CWORD_CWORD_CWORD_CWORD,
2924 /* 83 "S" */ CWORD_CWORD_CWORD_CWORD,
2925 /* 84 "T" */ CWORD_CWORD_CWORD_CWORD,
2926 /* 85 "U" */ CWORD_CWORD_CWORD_CWORD,
2927 /* 86 "V" */ CWORD_CWORD_CWORD_CWORD,
2928 /* 87 "W" */ CWORD_CWORD_CWORD_CWORD,
2929 /* 88 "X" */ CWORD_CWORD_CWORD_CWORD,
2930 /* 89 "Y" */ CWORD_CWORD_CWORD_CWORD,
2931 /* 90 "Z" */ CWORD_CWORD_CWORD_CWORD,
2932 /* 91 "[" */ CWORD_CCTL_CCTL_CWORD,
2933 /* 92 "\" */ CBACK_CBACK_CCTL_CBACK,
2934 /* 93 "]" */ CWORD_CCTL_CCTL_CWORD,
2935 /* 94 "^" */ CWORD_CWORD_CWORD_CWORD,
2936 /* 95 "_" */ CWORD_CWORD_CWORD_CWORD,
2937 /* 96 "`" */ CBQUOTE_CBQUOTE_CWORD_CBQUOTE,
2938 /* 97 "a" */ CWORD_CWORD_CWORD_CWORD,
2939 /* 98 "b" */ CWORD_CWORD_CWORD_CWORD,
2940 /* 99 "c" */ CWORD_CWORD_CWORD_CWORD,
2941 /* 100 "d" */ CWORD_CWORD_CWORD_CWORD,
2942 /* 101 "e" */ CWORD_CWORD_CWORD_CWORD,
2943 /* 102 "f" */ CWORD_CWORD_CWORD_CWORD,
2944 /* 103 "g" */ CWORD_CWORD_CWORD_CWORD,
2945 /* 104 "h" */ CWORD_CWORD_CWORD_CWORD,
2946 /* 105 "i" */ CWORD_CWORD_CWORD_CWORD,
2947 /* 106 "j" */ CWORD_CWORD_CWORD_CWORD,
2948 /* 107 "k" */ CWORD_CWORD_CWORD_CWORD,
2949 /* 108 "l" */ CWORD_CWORD_CWORD_CWORD,
2950 /* 109 "m" */ CWORD_CWORD_CWORD_CWORD,
2951 /* 110 "n" */ CWORD_CWORD_CWORD_CWORD,
2952 /* 111 "o" */ CWORD_CWORD_CWORD_CWORD,
2953 /* 112 "p" */ CWORD_CWORD_CWORD_CWORD,
2954 /* 113 "q" */ CWORD_CWORD_CWORD_CWORD,
2955 /* 114 "r" */ CWORD_CWORD_CWORD_CWORD,
2956 /* 115 "s" */ CWORD_CWORD_CWORD_CWORD,
2957 /* 116 "t" */ CWORD_CWORD_CWORD_CWORD,
2958 /* 117 "u" */ CWORD_CWORD_CWORD_CWORD,
2959 /* 118 "v" */ CWORD_CWORD_CWORD_CWORD,
2960 /* 119 "w" */ CWORD_CWORD_CWORD_CWORD,
2961 /* 120 "x" */ CWORD_CWORD_CWORD_CWORD,
2962 /* 121 "y" */ CWORD_CWORD_CWORD_CWORD,
2963 /* 122 "z" */ CWORD_CWORD_CWORD_CWORD,
2964 /* 123 "{" */ CWORD_CWORD_CWORD_CWORD,
2965 /* 124 "|" */ CSPCL_CWORD_CWORD_CWORD,
2966 /* 125 "}" */ CENDVAR_CENDVAR_CWORD_CENDVAR,
2967 /* 126 "~" */ CWORD_CCTL_CCTL_CWORD,
2968 /* 127 del */ CWORD_CWORD_CWORD_CWORD,
2969 /* 128 0x80 */ CWORD_CWORD_CWORD_CWORD,
2970 /* 129 CTLESC */ CCTL_CCTL_CCTL_CCTL,
2971 /* 130 CTLVAR */ CCTL_CCTL_CCTL_CCTL,
2972 /* 131 CTLENDVAR */ CCTL_CCTL_CCTL_CCTL,
2973 /* 132 CTLBACKQ */ CCTL_CCTL_CCTL_CCTL,
2974 /* 133 CTLQUOTE */ CCTL_CCTL_CCTL_CCTL,
2975 /* 134 CTLARI */ CCTL_CCTL_CCTL_CCTL,
2976 /* 135 CTLENDARI */ CCTL_CCTL_CCTL_CCTL,
2977 /* 136 CTLQUOTEMARK */ CCTL_CCTL_CCTL_CCTL,
2978 /* 137 */ CWORD_CWORD_CWORD_CWORD,
2979 /* 138 */ CWORD_CWORD_CWORD_CWORD,
2980 /* 139 */ CWORD_CWORD_CWORD_CWORD,
2981 /* 140 */ CWORD_CWORD_CWORD_CWORD,
2982 /* 141 */ CWORD_CWORD_CWORD_CWORD,
2983 /* 142 */ CWORD_CWORD_CWORD_CWORD,
2984 /* 143 */ CWORD_CWORD_CWORD_CWORD,
2985 /* 144 */ CWORD_CWORD_CWORD_CWORD,
2986 /* 145 */ CWORD_CWORD_CWORD_CWORD,
2987 /* 146 */ CWORD_CWORD_CWORD_CWORD,
2988 /* 147 */ CWORD_CWORD_CWORD_CWORD,
2989 /* 148 */ CWORD_CWORD_CWORD_CWORD,
2990 /* 149 */ CWORD_CWORD_CWORD_CWORD,
2991 /* 150 */ CWORD_CWORD_CWORD_CWORD,
2992 /* 151 */ CWORD_CWORD_CWORD_CWORD,
2993 /* 152 */ CWORD_CWORD_CWORD_CWORD,
2994 /* 153 */ CWORD_CWORD_CWORD_CWORD,
2995 /* 154 */ CWORD_CWORD_CWORD_CWORD,
2996 /* 155 */ CWORD_CWORD_CWORD_CWORD,
2997 /* 156 */ CWORD_CWORD_CWORD_CWORD,
2998 /* 157 */ CWORD_CWORD_CWORD_CWORD,
2999 /* 158 */ CWORD_CWORD_CWORD_CWORD,
3000 /* 159 */ CWORD_CWORD_CWORD_CWORD,
3001 /* 160 */ CWORD_CWORD_CWORD_CWORD,
3002 /* 161 */ CWORD_CWORD_CWORD_CWORD,
3003 /* 162 */ CWORD_CWORD_CWORD_CWORD,
3004 /* 163 */ CWORD_CWORD_CWORD_CWORD,
3005 /* 164 */ CWORD_CWORD_CWORD_CWORD,
3006 /* 165 */ CWORD_CWORD_CWORD_CWORD,
3007 /* 166 */ CWORD_CWORD_CWORD_CWORD,
3008 /* 167 */ CWORD_CWORD_CWORD_CWORD,
3009 /* 168 */ CWORD_CWORD_CWORD_CWORD,
3010 /* 169 */ CWORD_CWORD_CWORD_CWORD,
3011 /* 170 */ CWORD_CWORD_CWORD_CWORD,
3012 /* 171 */ CWORD_CWORD_CWORD_CWORD,
3013 /* 172 */ CWORD_CWORD_CWORD_CWORD,
3014 /* 173 */ CWORD_CWORD_CWORD_CWORD,
3015 /* 174 */ CWORD_CWORD_CWORD_CWORD,
3016 /* 175 */ CWORD_CWORD_CWORD_CWORD,
3017 /* 176 */ CWORD_CWORD_CWORD_CWORD,
3018 /* 177 */ CWORD_CWORD_CWORD_CWORD,
3019 /* 178 */ CWORD_CWORD_CWORD_CWORD,
3020 /* 179 */ CWORD_CWORD_CWORD_CWORD,
3021 /* 180 */ CWORD_CWORD_CWORD_CWORD,
3022 /* 181 */ CWORD_CWORD_CWORD_CWORD,
3023 /* 182 */ CWORD_CWORD_CWORD_CWORD,
3024 /* 183 */ CWORD_CWORD_CWORD_CWORD,
3025 /* 184 */ CWORD_CWORD_CWORD_CWORD,
3026 /* 185 */ CWORD_CWORD_CWORD_CWORD,
3027 /* 186 */ CWORD_CWORD_CWORD_CWORD,
3028 /* 187 */ CWORD_CWORD_CWORD_CWORD,
3029 /* 188 */ CWORD_CWORD_CWORD_CWORD,
3030 /* 189 */ CWORD_CWORD_CWORD_CWORD,
3031 /* 190 */ CWORD_CWORD_CWORD_CWORD,
3032 /* 191 */ CWORD_CWORD_CWORD_CWORD,
3033 /* 192 */ CWORD_CWORD_CWORD_CWORD,
3034 /* 193 */ CWORD_CWORD_CWORD_CWORD,
3035 /* 194 */ CWORD_CWORD_CWORD_CWORD,
3036 /* 195 */ CWORD_CWORD_CWORD_CWORD,
3037 /* 196 */ CWORD_CWORD_CWORD_CWORD,
3038 /* 197 */ CWORD_CWORD_CWORD_CWORD,
3039 /* 198 */ CWORD_CWORD_CWORD_CWORD,
3040 /* 199 */ CWORD_CWORD_CWORD_CWORD,
3041 /* 200 */ CWORD_CWORD_CWORD_CWORD,
3042 /* 201 */ CWORD_CWORD_CWORD_CWORD,
3043 /* 202 */ CWORD_CWORD_CWORD_CWORD,
3044 /* 203 */ CWORD_CWORD_CWORD_CWORD,
3045 /* 204 */ CWORD_CWORD_CWORD_CWORD,
3046 /* 205 */ CWORD_CWORD_CWORD_CWORD,
3047 /* 206 */ CWORD_CWORD_CWORD_CWORD,
3048 /* 207 */ CWORD_CWORD_CWORD_CWORD,
3049 /* 208 */ CWORD_CWORD_CWORD_CWORD,
3050 /* 209 */ CWORD_CWORD_CWORD_CWORD,
3051 /* 210 */ CWORD_CWORD_CWORD_CWORD,
3052 /* 211 */ CWORD_CWORD_CWORD_CWORD,
3053 /* 212 */ CWORD_CWORD_CWORD_CWORD,
3054 /* 213 */ CWORD_CWORD_CWORD_CWORD,
3055 /* 214 */ CWORD_CWORD_CWORD_CWORD,
3056 /* 215 */ CWORD_CWORD_CWORD_CWORD,
3057 /* 216 */ CWORD_CWORD_CWORD_CWORD,
3058 /* 217 */ CWORD_CWORD_CWORD_CWORD,
3059 /* 218 */ CWORD_CWORD_CWORD_CWORD,
3060 /* 219 */ CWORD_CWORD_CWORD_CWORD,
3061 /* 220 */ CWORD_CWORD_CWORD_CWORD,
3062 /* 221 */ CWORD_CWORD_CWORD_CWORD,
3063 /* 222 */ CWORD_CWORD_CWORD_CWORD,
3064 /* 223 */ CWORD_CWORD_CWORD_CWORD,
3065 /* 224 */ CWORD_CWORD_CWORD_CWORD,
3066 /* 225 */ CWORD_CWORD_CWORD_CWORD,
3067 /* 226 */ CWORD_CWORD_CWORD_CWORD,
3068 /* 227 */ CWORD_CWORD_CWORD_CWORD,
3069 /* 228 */ CWORD_CWORD_CWORD_CWORD,
3070 /* 229 */ CWORD_CWORD_CWORD_CWORD,
3071 /* 230 */ CWORD_CWORD_CWORD_CWORD,
3072 /* 231 */ CWORD_CWORD_CWORD_CWORD,
3073 /* 232 */ CWORD_CWORD_CWORD_CWORD,
3074 /* 233 */ CWORD_CWORD_CWORD_CWORD,
3075 /* 234 */ CWORD_CWORD_CWORD_CWORD,
3076 /* 235 */ CWORD_CWORD_CWORD_CWORD,
3077 /* 236 */ CWORD_CWORD_CWORD_CWORD,
3078 /* 237 */ CWORD_CWORD_CWORD_CWORD,
3079 /* 238 */ CWORD_CWORD_CWORD_CWORD,
3080 /* 239 */ CWORD_CWORD_CWORD_CWORD,
3081 /* 230 */ CWORD_CWORD_CWORD_CWORD,
3082 /* 241 */ CWORD_CWORD_CWORD_CWORD,
3083 /* 242 */ CWORD_CWORD_CWORD_CWORD,
3084 /* 243 */ CWORD_CWORD_CWORD_CWORD,
3085 /* 244 */ CWORD_CWORD_CWORD_CWORD,
3086 /* 245 */ CWORD_CWORD_CWORD_CWORD,
3087 /* 246 */ CWORD_CWORD_CWORD_CWORD,
3088 /* 247 */ CWORD_CWORD_CWORD_CWORD,
3089 /* 248 */ CWORD_CWORD_CWORD_CWORD,
3090 /* 249 */ CWORD_CWORD_CWORD_CWORD,
3091 /* 250 */ CWORD_CWORD_CWORD_CWORD,
3092 /* 251 */ CWORD_CWORD_CWORD_CWORD,
3093 /* 252 */ CWORD_CWORD_CWORD_CWORD,
3094 /* 253 */ CWORD_CWORD_CWORD_CWORD,
3095 /* 254 */ CWORD_CWORD_CWORD_CWORD,
3096 /* 255 */ CWORD_CWORD_CWORD_CWORD,
3097 /* PEOF */ CENDFILE_CENDFILE_CENDFILE_CENDFILE,
3098 # if ENABLE_ASH_ALIAS
3099 /* PEOA */ CSPCL_CIGN_CIGN_CIGN,
3103 # define SIT(c, syntax) ((S_I_T[syntax_index_table[c]] >> ((syntax)*4)) & 0xf)
3105 #endif /* !USE_SIT_FUNCTION */
3108 /* ============ Alias handling */
3110 #if ENABLE_ASH_ALIAS
3112 #define ALIASINUSE 1
3123 static struct alias **atab; // [ATABSIZE];
3124 #define INIT_G_alias() do { \
3125 atab = xzalloc(ATABSIZE * sizeof(atab[0])); \
3129 static struct alias **
3130 __lookupalias(const char *name) {
3131 unsigned int hashval;
3138 ch = (unsigned char)*p;
3142 ch = (unsigned char)*++p;
3144 app = &atab[hashval % ATABSIZE];
3146 for (; *app; app = &(*app)->next) {
3147 if (strcmp(name, (*app)->name) == 0) {
3155 static struct alias *
3156 lookupalias(const char *name, int check)
3158 struct alias *ap = *__lookupalias(name);
3160 if (check && ap && (ap->flag & ALIASINUSE))
3165 static struct alias *
3166 freealias(struct alias *ap)
3170 if (ap->flag & ALIASINUSE) {
3171 ap->flag |= ALIASDEAD;
3183 setalias(const char *name, const char *val)
3185 struct alias *ap, **app;
3187 app = __lookupalias(name);
3191 if (!(ap->flag & ALIASINUSE)) {
3194 ap->val = ckstrdup(val);
3195 ap->flag &= ~ALIASDEAD;
3198 ap = ckzalloc(sizeof(struct alias));
3199 ap->name = ckstrdup(name);
3200 ap->val = ckstrdup(val);
3201 /*ap->flag = 0; - ckzalloc did it */
3202 /*ap->next = NULL;*/
3209 unalias(const char *name)
3213 app = __lookupalias(name);
3217 *app = freealias(*app);
3228 struct alias *ap, **app;
3232 for (i = 0; i < ATABSIZE; i++) {
3234 for (ap = *app; ap; ap = *app) {
3235 *app = freealias(*app);
3245 printalias(const struct alias *ap)
3247 out1fmt("%s=%s\n", ap->name, single_quote(ap->val));
3251 * TODO - sort output
3253 static int FAST_FUNC
3254 aliascmd(int argc UNUSED_PARAM, char **argv)
3263 for (i = 0; i < ATABSIZE; i++) {
3264 for (ap = atab[i]; ap; ap = ap->next) {
3270 while ((n = *++argv) != NULL) {
3271 v = strchr(n+1, '=');
3272 if (v == NULL) { /* n+1: funny ksh stuff */
3273 ap = *__lookupalias(n);
3275 fprintf(stderr, "%s: %s not found\n", "alias", n);
3288 static int FAST_FUNC
3289 unaliascmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
3293 while ((i = nextopt("a")) != '\0') {
3299 for (i = 0; *argptr; argptr++) {
3300 if (unalias(*argptr)) {
3301 fprintf(stderr, "%s: %s not found\n", "unalias", *argptr);
3309 #endif /* ASH_ALIAS */
3312 /* ============ jobs.c */
3314 /* Mode argument to forkshell. Don't change FORK_FG or FORK_BG. */
3317 #define FORK_NOJOB 2
3319 /* mode flags for showjob(s) */
3320 #define SHOW_ONLY_PGID 0x01 /* show only pgid (jobs -p) */
3321 #define SHOW_PIDS 0x02 /* show individual pids, not just one line per job */
3322 #define SHOW_CHANGED 0x04 /* only jobs whose state has changed */
3325 * A job structure contains information about a job. A job is either a
3326 * single process or a set of processes contained in a pipeline. In the
3327 * latter case, pidlist will be non-NULL, and will point to a -1 terminated
3331 pid_t ps_pid; /* process id */
3332 int ps_status; /* last process status from wait() */
3333 char *ps_cmd; /* text of command being run */
3337 struct procstat ps0; /* status of process */
3338 struct procstat *ps; /* status or processes when more than one */
3340 int stopstatus; /* status of a stopped job */
3343 nprocs: 16, /* number of processes */
3345 #define JOBRUNNING 0 /* at least one proc running */
3346 #define JOBSTOPPED 1 /* all procs are stopped */
3347 #define JOBDONE 2 /* all procs are completed */
3349 sigint: 1, /* job was killed by SIGINT */
3350 jobctl: 1, /* job running under job control */
3352 waited: 1, /* true if this entry has been waited for */
3353 used: 1, /* true if this entry is in used */
3354 changed: 1; /* true if status has changed */
3355 struct job *prev_job; /* previous job */
3358 static struct job *makejob(/*union node *,*/ int);
3359 static int forkshell(struct job *, union node *, int);
3360 static int waitforjob(struct job *);
3363 enum { doing_jobctl = 0 };
3364 #define setjobctl(on) do {} while (0)
3366 static smallint doing_jobctl; //references:8
3367 static void setjobctl(int);
3374 ignoresig(int signo)
3376 /* Avoid unnecessary system calls. Is it already SIG_IGNed? */
3377 if (sigmode[signo - 1] != S_IGN && sigmode[signo - 1] != S_HARD_IGN) {
3378 /* No, need to do it */
3379 signal(signo, SIG_IGN);
3381 sigmode[signo - 1] = S_HARD_IGN;
3385 * Only one usage site - in setsignal()
3388 signal_handler(int signo)
3390 gotsig[signo - 1] = 1;
3392 if (signo == SIGINT && !trap[SIGINT]) {
3393 if (!suppress_int) {
3395 raise_interrupt(); /* does not return */
3399 pending_sig = signo;
3404 * Set the signal handler for the specified signal. The routine figures
3405 * out what it should be set to.
3408 setsignal(int signo)
3411 char cur_act, new_act;
3412 struct sigaction act;
3416 if (t != NULL) { /* trap for this sig is set */
3418 if (t[0] == '\0') /* trap is "": ignore this sig */
3422 if (rootshell && new_act == S_DFL) {
3425 if (iflag || minusc || sflag == 0)
3434 * "In all cases, bash ignores SIGQUIT. Non-builtin
3435 * commands run by bash have signal handlers
3436 * set to the values inherited by the shell
3437 * from its parent". */
3453 //TODO: if !rootshell, we reset SIGQUIT to DFL,
3454 //whereas we have to restore it to what shell got on entry
3455 //from the parent. See comment above
3457 t = &sigmode[signo - 1];
3460 /* current setting is not yet known */
3461 if (sigaction(signo, NULL, &act)) {
3462 /* pretend it worked; maybe we should give a warning,
3463 * but other shells don't. We don't alter sigmode,
3464 * so we retry every time.
3465 * btw, in Linux it never fails. --vda */
3468 if (act.sa_handler == SIG_IGN) {
3469 cur_act = S_HARD_IGN;
3471 && (signo == SIGTSTP || signo == SIGTTIN || signo == SIGTTOU)
3473 cur_act = S_IGN; /* don't hard ignore these */
3477 if (cur_act == S_HARD_IGN || cur_act == new_act)
3480 act.sa_handler = SIG_DFL;
3483 act.sa_handler = signal_handler;
3484 act.sa_flags = 0; /* matters only if !DFL and !IGN */
3485 sigfillset(&act.sa_mask); /* ditto */
3488 act.sa_handler = SIG_IGN;
3491 sigaction_set(signo, &act);
3496 /* mode flags for set_curjob */
3497 #define CUR_DELETE 2
3498 #define CUR_RUNNING 1
3499 #define CUR_STOPPED 0
3501 /* mode flags for dowait */
3502 #define DOWAIT_NONBLOCK WNOHANG
3503 #define DOWAIT_BLOCK 0
3506 /* pgrp of shell on invocation */
3507 static int initialpgrp; //references:2
3508 static int ttyfd = -1; //5
3511 static struct job *jobtab; //5
3513 static unsigned njobs; //4
3515 static struct job *curjob; //lots
3516 /* number of presumed living untracked jobs */
3517 static int jobless; //4
3520 set_curjob(struct job *jp, unsigned mode)
3523 struct job **jpp, **curp;
3525 /* first remove from list */
3526 jpp = curp = &curjob;
3531 jpp = &jp1->prev_job;
3533 *jpp = jp1->prev_job;
3535 /* Then re-insert in correct position */
3543 /* job being deleted */
3546 /* newly created job or backgrounded job,
3547 put after all stopped jobs. */
3551 if (!jp1 || jp1->state != JOBSTOPPED)
3554 jpp = &jp1->prev_job;
3560 /* newly stopped job - becomes curjob */
3561 jp->prev_job = *jpp;
3569 jobno(const struct job *jp)
3571 return jp - jobtab + 1;
3576 * Convert a job name to a job structure.
3579 #define getjob(name, getctl) getjob(name)
3582 getjob(const char *name, int getctl)
3586 const char *err_msg = "%s: no such job";
3590 char *(*match)(const char *, const char *);
3605 if (c == '+' || c == '%') {
3607 err_msg = "No current job";
3613 err_msg = "No previous job";
3624 jp = jobtab + num - 1;
3639 if (match(jp->ps[0].ps_cmd, p)) {
3643 err_msg = "%s: ambiguous";
3653 err_msg = "job %s not created under job control";
3654 if (getctl && jp->jobctl == 0)
3659 ash_msg_and_raise_error(err_msg, name);
3663 * Mark a job structure as unused.
3666 freejob(struct job *jp)
3668 struct procstat *ps;
3672 for (i = jp->nprocs, ps = jp->ps; --i >= 0; ps++) {
3673 if (ps->ps_cmd != nullstr)
3676 if (jp->ps != &jp->ps0)
3679 set_curjob(jp, CUR_DELETE);
3685 xtcsetpgrp(int fd, pid_t pgrp)
3687 if (tcsetpgrp(fd, pgrp))
3688 ash_msg_and_raise_error("can't set tty process group (%m)");
3692 * Turn job control on and off.
3694 * Note: This code assumes that the third arg to ioctl is a character
3695 * pointer, which is true on Berkeley systems but not System V. Since
3696 * System V doesn't have job control yet, this isn't a problem now.
3698 * Called with interrupts off.
3706 if (on == doing_jobctl || rootshell == 0)
3710 ofd = fd = open(_PATH_TTY, O_RDWR);
3712 /* BTW, bash will try to open(ttyname(0)) if open("/dev/tty") fails.
3713 * That sometimes helps to acquire controlling tty.
3714 * Obviously, a workaround for bugs when someone
3715 * failed to provide a controlling tty to bash! :) */
3721 fd = fcntl(fd, F_DUPFD, 10);
3726 /* fd is a tty at this point */
3727 close_on_exec_on(fd);
3728 do { /* while we are in the background */
3729 pgrp = tcgetpgrp(fd);
3732 ash_msg("can't access tty; job control turned off");
3736 if (pgrp == getpgrp())
3747 xtcsetpgrp(fd, pgrp);
3749 /* turning job control off */
3752 /* was xtcsetpgrp, but this can make exiting ash
3753 * loop forever if pty is already deleted */
3754 tcsetpgrp(fd, pgrp);
3768 static int FAST_FUNC
3769 killcmd(int argc, char **argv)
3772 if (argv[1] && strcmp(argv[1], "-l") != 0) {
3774 if (argv[i][0] == '%') {
3775 struct job *jp = getjob(argv[i], 0);
3776 unsigned pid = jp->ps[0].ps_pid;
3777 /* Enough space for ' -NNN<nul>' */
3778 argv[i] = alloca(sizeof(int)*3 + 3);
3779 /* kill_main has matching code to expect
3780 * leading space. Needed to not confuse
3781 * negative pids with "kill -SIGNAL_NO" syntax */
3782 sprintf(argv[i], " -%u", pid);
3784 } while (argv[++i]);
3786 return kill_main(argc, argv);
3790 showpipe(struct job *jp /*, FILE *out*/)
3792 struct procstat *ps;
3793 struct procstat *psend;
3795 psend = jp->ps + jp->nprocs;
3796 for (ps = jp->ps + 1; ps < psend; ps++)
3797 printf(" | %s", ps->ps_cmd);
3798 outcslow('\n', stdout);
3799 flush_stdout_stderr();
3804 restartjob(struct job *jp, int mode)
3806 struct procstat *ps;
3812 if (jp->state == JOBDONE)
3814 jp->state = JOBRUNNING;
3815 pgid = jp->ps[0].ps_pid;
3816 if (mode == FORK_FG)
3817 xtcsetpgrp(ttyfd, pgid);
3818 killpg(pgid, SIGCONT);
3822 if (WIFSTOPPED(ps->ps_status)) {
3828 status = (mode == FORK_FG) ? waitforjob(jp) : 0;
3833 static int FAST_FUNC
3834 fg_bgcmd(int argc UNUSED_PARAM, char **argv)
3840 mode = (**argv == 'f') ? FORK_FG : FORK_BG;
3844 jp = getjob(*argv, 1);
3845 if (mode == FORK_BG) {
3846 set_curjob(jp, CUR_RUNNING);
3847 printf("[%d] ", jobno(jp));
3849 out1str(jp->ps[0].ps_cmd);
3850 showpipe(jp /*, stdout*/);
3851 retval = restartjob(jp, mode);
3852 } while (*argv && *++argv);
3858 sprint_status(char *s, int status, int sigonly)
3864 if (!WIFEXITED(status)) {
3866 if (WIFSTOPPED(status))
3867 st = WSTOPSIG(status);
3870 st = WTERMSIG(status);
3872 if (st == SIGINT || st == SIGPIPE)
3875 if (WIFSTOPPED(status))
3880 col = fmtstr(s, 32, strsignal(st));
3881 if (WCOREDUMP(status)) {
3882 col += fmtstr(s + col, 16, " (core dumped)");
3884 } else if (!sigonly) {
3885 st = WEXITSTATUS(status);
3887 col = fmtstr(s, 16, "Done(%d)", st);
3889 col = fmtstr(s, 16, "Done");
3896 dowait(int wait_flags, struct job *job)
3901 struct job *thisjob;
3904 TRACE(("dowait(0x%x) called\n", wait_flags));
3906 /* Do a wait system call. If job control is compiled in, we accept
3907 * stopped processes. wait_flags may have WNOHANG, preventing blocking.
3908 * NB: _not_ safe_waitpid, we need to detect EINTR */
3910 wait_flags |= WUNTRACED;
3911 pid = waitpid(-1, &status, wait_flags);
3912 TRACE(("wait returns pid=%d, status=0x%x, errno=%d(%s)\n",
3913 pid, status, errno, strerror(errno)));
3919 for (jp = curjob; jp; jp = jp->prev_job) {
3920 struct procstat *ps;
3921 struct procstat *psend;
3922 if (jp->state == JOBDONE)
3926 psend = ps + jp->nprocs;
3928 if (ps->ps_pid == pid) {
3929 TRACE(("Job %d: changing status of proc %d "
3930 "from 0x%x to 0x%x\n",
3931 jobno(jp), pid, ps->ps_status, status));
3932 ps->ps_status = status;
3935 if (ps->ps_status == -1)
3938 if (state == JOBRUNNING)
3940 if (WIFSTOPPED(ps->ps_status)) {
3941 jp->stopstatus = ps->ps_status;
3945 } while (++ps < psend);
3950 if (!WIFSTOPPED(status))
3956 if (state != JOBRUNNING) {
3957 thisjob->changed = 1;
3959 if (thisjob->state != state) {
3960 TRACE(("Job %d: changing state from %d to %d\n",
3961 jobno(thisjob), thisjob->state, state));
3962 thisjob->state = state;
3964 if (state == JOBSTOPPED) {
3965 set_curjob(thisjob, CUR_STOPPED);
3974 if (thisjob && thisjob == job) {
3978 len = sprint_status(s, status, 1);
3989 blocking_wait_with_raise_on_sig(void)
3991 pid_t pid = dowait(DOWAIT_BLOCK, NULL);
3992 if (pid <= 0 && pending_sig)
3993 raise_exception(EXSIG);
3999 showjob(FILE *out, struct job *jp, int mode)
4001 struct procstat *ps;
4002 struct procstat *psend;
4009 if (mode & SHOW_ONLY_PGID) { /* jobs -p */
4010 /* just output process (group) id of pipeline */
4011 fprintf(out, "%d\n", ps->ps_pid);
4015 col = fmtstr(s, 16, "[%d] ", jobno(jp));
4020 else if (curjob && jp == curjob->prev_job)
4023 if (mode & SHOW_PIDS)
4024 col += fmtstr(s + col, 16, "%d ", ps->ps_pid);
4026 psend = ps + jp->nprocs;
4028 if (jp->state == JOBRUNNING) {
4029 strcpy(s + col, "Running");
4030 col += sizeof("Running") - 1;
4032 int status = psend[-1].ps_status;
4033 if (jp->state == JOBSTOPPED)
4034 status = jp->stopstatus;
4035 col += sprint_status(s + col, status, 0);
4037 /* By now, "[JOBID]* [maybe PID] STATUS" is printed */
4039 /* This loop either prints "<cmd1> | <cmd2> | <cmd3>" line
4040 * or prints several "PID | <cmdN>" lines,
4041 * depending on SHOW_PIDS bit.
4042 * We do not print status of individual processes
4043 * between PID and <cmdN>. bash does it, but not very well:
4044 * first line shows overall job status, not process status,
4045 * making it impossible to know 1st process status.
4049 /* for each process */
4052 if (mode & SHOW_PIDS)
4053 col = fmtstr(s, 48, "\n%*c%d ", indent_col, ' ', ps->ps_pid) - 1;
4055 fprintf(out, "%s%*c%s%s",
4057 33 - col >= 0 ? 33 - col : 0, ' ',
4058 ps == jp->ps ? "" : "| ",
4061 } while (++ps != psend);
4062 outcslow('\n', out);
4066 if (jp->state == JOBDONE) {
4067 TRACE(("showjob: freeing job %d\n", jobno(jp)));
4073 * Print a list of jobs. If "change" is nonzero, only print jobs whose
4074 * statuses have changed since the last call to showjobs.
4077 showjobs(FILE *out, int mode)
4081 TRACE(("showjobs(0x%x) called\n", mode));
4083 /* Handle all finished jobs */
4084 while (dowait(DOWAIT_NONBLOCK, NULL) > 0)
4087 for (jp = curjob; jp; jp = jp->prev_job) {
4088 if (!(mode & SHOW_CHANGED) || jp->changed) {
4089 showjob(out, jp, mode);
4094 static int FAST_FUNC
4095 jobscmd(int argc UNUSED_PARAM, char **argv)
4100 while ((m = nextopt("lp")) != '\0') {
4104 mode |= SHOW_ONLY_PGID;
4110 showjob(stdout, getjob(*argv, 0), mode);
4113 showjobs(stdout, mode);
4120 /* Called only on finished or stopped jobs (no members are running) */
4122 getstatus(struct job *job)
4126 struct procstat *ps;
4128 /* Fetch last member's status */
4129 ps = job->ps + job->nprocs - 1;
4130 status = ps->ps_status;
4132 /* "set -o pipefail" mode: use last _nonzero_ status */
4133 while (status == 0 && --ps >= job->ps)
4134 status = ps->ps_status;
4137 retval = WEXITSTATUS(status);
4138 if (!WIFEXITED(status)) {
4140 retval = WSTOPSIG(status);
4141 if (!WIFSTOPPED(status))
4144 /* XXX: limits number of signals */
4145 retval = WTERMSIG(status);
4147 if (retval == SIGINT)
4153 TRACE(("getstatus: job %d, nproc %d, status 0x%x, retval 0x%x\n",
4154 jobno(job), job->nprocs, status, retval));
4158 static int FAST_FUNC
4159 waitcmd(int argc UNUSED_PARAM, char **argv)
4166 raise_exception(EXSIG);
4173 /* wait for all jobs */
4177 if (!jp) /* no running procs */
4179 if (jp->state == JOBRUNNING)
4184 blocking_wait_with_raise_on_sig();
4186 * "When bash is waiting for an asynchronous command via
4187 * the wait builtin, the reception of a signal for which a trap
4188 * has been set will cause the wait builtin to return immediately
4189 * with an exit status greater than 128, immediately after which
4190 * the trap is executed."
4192 * blocking_wait_with_raise_on_sig raises signal handlers
4193 * if it gets no pid (pid < 0). However,
4194 * if child sends us a signal *and immediately exits*,
4195 * blocking_wait_with_raise_on_sig gets pid > 0
4196 * and does not handle pending_sig. Check this case: */
4198 raise_exception(EXSIG);
4204 if (**argv != '%') {
4205 pid_t pid = number(*argv);
4210 if (job->ps[job->nprocs - 1].ps_pid == pid)
4212 job = job->prev_job;
4215 job = getjob(*argv, 0);
4216 /* loop until process terminated or stopped */
4217 while (job->state == JOBRUNNING)
4218 blocking_wait_with_raise_on_sig();
4220 retval = getstatus(job);
4233 struct job *jp, *jq;
4235 len = njobs * sizeof(*jp);
4237 jp = ckrealloc(jq, len + 4 * sizeof(*jp));
4239 offset = (char *)jp - (char *)jq;
4241 /* Relocate pointers */
4244 jq = (struct job *)((char *)jq + l);
4248 #define joff(p) ((struct job *)((char *)(p) + l))
4249 #define jmove(p) (p) = (void *)((char *)(p) + offset)
4250 if (joff(jp)->ps == &jq->ps0)
4251 jmove(joff(jp)->ps);
4252 if (joff(jp)->prev_job)
4253 jmove(joff(jp)->prev_job);
4263 jp = (struct job *)((char *)jp + len);
4267 } while (--jq >= jp);
4272 * Return a new job structure.
4273 * Called with interrupts off.
4276 makejob(/*union node *node,*/ int nprocs)
4281 for (i = njobs, jp = jobtab; ; jp++) {
4288 if (jp->state != JOBDONE || !jp->waited)
4297 memset(jp, 0, sizeof(*jp));
4299 /* jp->jobctl is a bitfield.
4300 * "jp->jobctl |= jobctl" likely to give awful code */
4304 jp->prev_job = curjob;
4309 jp->ps = ckmalloc(nprocs * sizeof(struct procstat));
4311 TRACE(("makejob(%d) returns %%%d\n", nprocs,
4318 * Return a string identifying a command (to be printed by the
4321 static char *cmdnextc;
4324 cmdputs(const char *s)
4326 static const char vstype[VSTYPE + 1][3] = {
4327 "", "}", "-", "+", "?", "=",
4328 "%", "%%", "#", "##"
4329 IF_ASH_BASH_COMPAT(, ":", "/", "//")
4332 const char *p, *str;
4336 unsigned char subtype = 0;
4340 nextc = makestrspace((strlen(s) + 1) * 8, cmdnextc);
4342 while ((c = *p++) != '\0') {
4350 if ((subtype & VSTYPE) == VSLENGTH)
4354 if (!(subtype & VSQUOTE) == !(quoted & 1))
4360 str = "\"}" + !(quoted & 1);
4367 case CTLBACKQ+CTLQUOTE:
4370 #if ENABLE_SH_MATH_SUPPORT
4385 if ((subtype & VSTYPE) != VSNORMAL)
4387 str = vstype[subtype & VSTYPE];
4388 if (subtype & VSNUL)
4397 /* These can only happen inside quotes */
4410 while ((c = *str++) != '\0') {
4413 } /* while *p++ not NUL */
4416 USTPUTC('"', nextc);
4422 /* cmdtxt() and cmdlist() call each other */
4423 static void cmdtxt(union node *n);
4426 cmdlist(union node *np, int sep)
4428 for (; np; np = np->narg.next) {
4432 if (sep && np->narg.next)
4438 cmdtxt(union node *n)
4441 struct nodelist *lp;
4452 lp = n->npipe.cmdlist;
4470 cmdtxt(n->nbinary.ch1);
4486 cmdtxt(n->nif.test);
4488 if (n->nif.elsepart) {
4489 cmdtxt(n->nif.ifpart);
4491 n = n->nif.elsepart;
4509 cmdtxt(n->nbinary.ch1);
4519 cmdputs(n->nfor.var);
4521 cmdlist(n->nfor.args, 1);
4526 cmdputs(n->narg.text);
4530 cmdlist(n->ncmd.args, 1);
4531 cmdlist(n->ncmd.redirect, 0);
4544 cmdputs(n->ncase.expr->narg.text);
4546 for (np = n->ncase.cases; np; np = np->nclist.next) {
4547 cmdtxt(np->nclist.pattern);
4549 cmdtxt(np->nclist.body);
4563 #if ENABLE_ASH_BASH_COMPAT
4578 cmdputs(utoa(n->nfile.fd));
4580 if (n->type == NTOFD || n->type == NFROMFD) {
4581 cmdputs(utoa(n->ndup.dupfd));
4590 commandtext(union node *n)
4594 STARTSTACKSTR(cmdnextc);
4596 name = stackblock();
4597 TRACE(("commandtext: name %p, end %p\n\t\"%s\"\n",
4598 name, cmdnextc, cmdnextc));
4599 return ckstrdup(name);
4604 * Fork off a subshell. If we are doing job control, give the subshell its
4605 * own process group. Jp is a job structure that the job is to be added to.
4606 * N is the command that will be evaluated by the child. Both jp and n may
4607 * be NULL. The mode parameter can be one of the following:
4608 * FORK_FG - Fork off a foreground process.
4609 * FORK_BG - Fork off a background process.
4610 * FORK_NOJOB - Like FORK_FG, but don't give the process its own
4611 * process group even if job control is on.
4613 * When job control is turned off, background processes have their standard
4614 * input redirected to /dev/null (except for the second and later processes
4617 * Called with interrupts off.
4620 * Clear traps on a fork.
4627 for (tp = trap; tp < &trap[NSIG]; tp++) {
4628 if (*tp && **tp) { /* trap not NULL or "" (SIG_IGN) */
4630 if (trap_ptr == trap)
4632 /* else: it "belongs" to trap_ptr vector, don't free */
4634 if ((tp - trap) != 0)
4635 setsignal(tp - trap);
4642 /* Lives far away from here, needed for forkchild */
4643 static void closescript(void);
4645 /* Called after fork(), in child */
4646 static NOINLINE void
4647 forkchild(struct job *jp, union node *n, int mode)
4651 TRACE(("Child shell %d\n", getpid()));
4655 /* man bash: "Non-builtin commands run by bash have signal handlers
4656 * set to the values inherited by the shell from its parent".
4657 * Do we do it correctly? */
4661 if (mode == FORK_NOJOB /* is it `xxx` ? */
4662 && n && n->type == NCMD /* is it single cmd? */
4663 /* && n->ncmd.args->type == NARG - always true? */
4664 && n->ncmd.args && strcmp(n->ncmd.args->narg.text, "trap") == 0
4665 && n->ncmd.args->narg.next == NULL /* "trap" with no arguments */
4666 /* && n->ncmd.args->narg.backquote == NULL - do we need to check this? */
4668 TRACE(("Trap hack\n"));
4669 /* Awful hack for `trap` or $(trap).
4671 * http://www.opengroup.org/onlinepubs/009695399/utilities/trap.html
4672 * contains an example where "trap" is executed in a subshell:
4674 * save_traps=$(trap)
4676 * eval "$save_traps"
4678 * Standard does not say that "trap" in subshell shall print
4679 * parent shell's traps. It only says that its output
4680 * must have suitable form, but then, in the above example
4681 * (which is not supposed to be normative), it implies that.
4683 * bash (and probably other shell) does implement it
4684 * (traps are reset to defaults, but "trap" still shows them),
4685 * but as a result, "trap" logic is hopelessly messed up:
4688 * trap -- 'echo Ho' SIGWINCH <--- we have a handler
4689 * # (trap) <--- trap is in subshell - no output (correct, traps are reset)
4690 * # true | trap <--- trap is in subshell - no output (ditto)
4691 * # echo `true | trap` <--- in subshell - output (but traps are reset!)
4692 * trap -- 'echo Ho' SIGWINCH
4693 * # echo `(trap)` <--- in subshell in subshell - output
4694 * trap -- 'echo Ho' SIGWINCH
4695 * # echo `true | (trap)` <--- in subshell in subshell in subshell - output!
4696 * trap -- 'echo Ho' SIGWINCH
4698 * The rules when to forget and when to not forget traps
4699 * get really complex and nonsensical.
4701 * Our solution: ONLY bare $(trap) or `trap` is special.
4703 /* Save trap handler strings for trap builtin to print */
4704 trap_ptr = memcpy(xmalloc(sizeof(trap)), trap, sizeof(trap));
4705 /* Fall through into clearing traps */
4709 /* do job control only in root shell */
4711 if (mode != FORK_NOJOB && jp->jobctl && !oldlvl) {
4714 if (jp->nprocs == 0)
4717 pgrp = jp->ps[0].ps_pid;
4718 /* this can fail because we are doing it in the parent also */
4720 if (mode == FORK_FG)
4721 xtcsetpgrp(ttyfd, pgrp);
4726 if (mode == FORK_BG) {
4727 /* man bash: "When job control is not in effect,
4728 * asynchronous commands ignore SIGINT and SIGQUIT" */
4731 if (jp->nprocs == 0) {
4733 if (open(bb_dev_null, O_RDONLY) != 0)
4734 ash_msg_and_raise_error("can't open '%s'", bb_dev_null);
4738 if (iflag) { /* why if iflag only? */
4743 * "In all cases, bash ignores SIGQUIT. Non-builtin
4744 * commands run by bash have signal handlers
4745 * set to the values inherited by the shell
4747 * Take care of the second rule: */
4751 if (n && n->type == NCMD
4752 && n->ncmd.args && strcmp(n->ncmd.args->narg.text, "jobs") == 0
4754 TRACE(("Job hack\n"));
4755 /* "jobs": we do not want to clear job list for it,
4756 * instead we remove only _its_ own_ job from job list.
4757 * This makes "jobs .... | cat" more useful.
4763 for (jp = curjob; jp; jp = jp->prev_job)
4768 /* Called after fork(), in parent */
4770 #define forkparent(jp, n, mode, pid) forkparent(jp, mode, pid)
4773 forkparent(struct job *jp, union node *n, int mode, pid_t pid)
4775 TRACE(("In parent shell: child = %d\n", pid));
4777 while (jobless && dowait(DOWAIT_NONBLOCK, NULL) > 0)
4783 if (mode != FORK_NOJOB && jp->jobctl) {
4786 if (jp->nprocs == 0)
4789 pgrp = jp->ps[0].ps_pid;
4790 /* This can fail because we are doing it in the child also */
4794 if (mode == FORK_BG) {
4795 backgndpid = pid; /* set $! */
4796 set_curjob(jp, CUR_RUNNING);
4799 struct procstat *ps = &jp->ps[jp->nprocs++];
4802 ps->ps_cmd = nullstr;
4804 if (doing_jobctl && n)
4805 ps->ps_cmd = commandtext(n);
4811 forkshell(struct job *jp, union node *n, int mode)
4815 TRACE(("forkshell(%%%d, %p, %d) called\n", jobno(jp), n, mode));
4818 TRACE(("Fork failed, errno=%d", errno));
4821 ash_msg_and_raise_error("can't fork");
4824 CLEAR_RANDOM_T(&random_gen); /* or else $RANDOM repeats in child */
4825 forkchild(jp, n, mode);
4827 forkparent(jp, n, mode, pid);
4833 * Wait for job to finish.
4835 * Under job control we have the problem that while a child process
4836 * is running interrupts generated by the user are sent to the child
4837 * but not to the shell. This means that an infinite loop started by
4838 * an interactive user may be hard to kill. With job control turned off,
4839 * an interactive user may place an interactive program inside a loop.
4840 * If the interactive program catches interrupts, the user doesn't want
4841 * these interrupts to also abort the loop. The approach we take here
4842 * is to have the shell ignore interrupt signals while waiting for a
4843 * foreground process to terminate, and then send itself an interrupt
4844 * signal if the child process was terminated by an interrupt signal.
4845 * Unfortunately, some programs want to do a bit of cleanup and then
4846 * exit on interrupt; unless these processes terminate themselves by
4847 * sending a signal to themselves (instead of calling exit) they will
4848 * confuse this approach.
4850 * Called with interrupts off.
4853 waitforjob(struct job *jp)
4857 TRACE(("waitforjob(%%%d) called\n", jobno(jp)));
4860 while (jp->state == JOBRUNNING) {
4861 /* In non-interactive shells, we _can_ get
4862 * a keyboard signal here and be EINTRed,
4863 * but we just loop back, waiting for command to complete.
4866 * "If bash is waiting for a command to complete and receives
4867 * a signal for which a trap has been set, the trap
4868 * will not be executed until the command completes."
4870 * Reality is that even if trap is not set, bash
4871 * will not act on the signal until command completes.
4872 * Try this. sleep5intoff.c:
4873 * #include <signal.h>
4874 * #include <unistd.h>
4877 * sigemptyset(&set);
4878 * sigaddset(&set, SIGINT);
4879 * sigaddset(&set, SIGQUIT);
4880 * sigprocmask(SIG_BLOCK, &set, NULL);
4884 * $ bash -c './sleep5intoff; echo hi'
4885 * ^C^C^C^C <--- pressing ^C once a second
4887 * $ bash -c './sleep5intoff; echo hi'
4888 * ^\^\^\^\hi <--- pressing ^\ (SIGQUIT)
4891 dowait(DOWAIT_BLOCK, jp);
4898 xtcsetpgrp(ttyfd, rootpid);
4900 * This is truly gross.
4901 * If we're doing job control, then we did a TIOCSPGRP which
4902 * caused us (the shell) to no longer be in the controlling
4903 * session -- so we wouldn't have seen any ^C/SIGINT. So, we
4904 * intuit from the subprocess exit status whether a SIGINT
4905 * occurred, and if so interrupt ourselves. Yuck. - mycroft
4907 if (jp->sigint) /* TODO: do the same with all signals */
4908 raise(SIGINT); /* ... by raise(jp->sig) instead? */
4910 if (jp->state == JOBDONE)
4917 * return 1 if there are stopped jobs, otherwise 0
4929 if (jp && jp->state == JOBSTOPPED) {
4930 out2str("You have stopped jobs.\n");
4939 /* ============ redir.c
4941 * Code for dealing with input/output redirection.
4944 #define EMPTY -2 /* marks an unused slot in redirtab */
4945 #define CLOSED -3 /* marks a slot of previously-closed fd */
4948 * Open a file in noclobber mode.
4949 * The code was copied from bash.
4952 noclobberopen(const char *fname)
4955 struct stat finfo, finfo2;
4958 * If the file exists and is a regular file, return an error
4961 r = stat(fname, &finfo);
4962 if (r == 0 && S_ISREG(finfo.st_mode)) {
4968 * If the file was not present (r != 0), make sure we open it
4969 * exclusively so that if it is created before we open it, our open
4970 * will fail. Make sure that we do not truncate an existing file.
4971 * Note that we don't turn on O_EXCL unless the stat failed -- if the
4972 * file was not a regular file, we leave O_EXCL off.
4975 return open(fname, O_WRONLY|O_CREAT|O_EXCL, 0666);
4976 fd = open(fname, O_WRONLY|O_CREAT, 0666);
4978 /* If the open failed, return the file descriptor right away. */
4983 * OK, the open succeeded, but the file may have been changed from a
4984 * non-regular file to a regular file between the stat and the open.
4985 * We are assuming that the O_EXCL open handles the case where FILENAME
4986 * did not exist and is symlinked to an existing file between the stat
4991 * If we can open it and fstat the file descriptor, and neither check
4992 * revealed that it was a regular file, and the file has not been
4993 * replaced, return the file descriptor.
4995 if (fstat(fd, &finfo2) == 0
4996 && !S_ISREG(finfo2.st_mode)
4997 && finfo.st_dev == finfo2.st_dev
4998 && finfo.st_ino == finfo2.st_ino
5003 /* The file has been replaced. badness. */
5010 * Handle here documents. Normally we fork off a process to write the
5011 * data to a pipe. If the document is short, we can stuff the data in
5012 * the pipe without forking.
5014 /* openhere needs this forward reference */
5015 static void expandhere(union node *arg, int fd);
5017 openhere(union node *redir)
5023 ash_msg_and_raise_error("pipe call failed");
5024 if (redir->type == NHERE) {
5025 len = strlen(redir->nhere.doc->narg.text);
5026 if (len <= PIPE_BUF) {
5027 full_write(pip[1], redir->nhere.doc->narg.text, len);
5031 if (forkshell((struct job *)NULL, (union node *)NULL, FORK_NOJOB) == 0) {
5034 ignoresig(SIGINT); //signal(SIGINT, SIG_IGN);
5035 ignoresig(SIGQUIT); //signal(SIGQUIT, SIG_IGN);
5036 ignoresig(SIGHUP); //signal(SIGHUP, SIG_IGN);
5037 ignoresig(SIGTSTP); //signal(SIGTSTP, SIG_IGN);
5038 signal(SIGPIPE, SIG_DFL);
5039 if (redir->type == NHERE)
5040 full_write(pip[1], redir->nhere.doc->narg.text, len);
5042 expandhere(redir->nhere.doc, pip[1]);
5043 _exit(EXIT_SUCCESS);
5051 openredirect(union node *redir)
5056 switch (redir->nfile.type) {
5058 fname = redir->nfile.expfname;
5059 f = open(fname, O_RDONLY);
5064 fname = redir->nfile.expfname;
5065 f = open(fname, O_RDWR|O_CREAT, 0666);
5070 #if ENABLE_ASH_BASH_COMPAT
5073 /* Take care of noclobber mode. */
5075 fname = redir->nfile.expfname;
5076 f = noclobberopen(fname);
5083 fname = redir->nfile.expfname;
5084 f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666);
5089 fname = redir->nfile.expfname;
5090 f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666);
5098 /* Fall through to eliminate warning. */
5099 /* Our single caller does this itself */
5106 f = openhere(redir);
5112 ash_msg_and_raise_error("can't create %s: %s", fname, errmsg(errno, "nonexistent directory"));
5114 ash_msg_and_raise_error("can't open %s: %s", fname, errmsg(errno, "no such file"));
5118 * Copy a file descriptor to be >= to. Returns -1
5119 * if the source file descriptor is closed, EMPTY if there are no unused
5120 * file descriptors left.
5122 /* 0x800..00: bit to set in "to" to request dup2 instead of fcntl(F_DUPFD).
5123 * old code was doing close(to) prior to copyfd() to achieve the same */
5125 COPYFD_EXACT = (int)~(INT_MAX),
5126 COPYFD_RESTORE = (int)((unsigned)COPYFD_EXACT >> 1),
5129 copyfd(int from, int to)
5133 if (to & COPYFD_EXACT) {
5134 to &= ~COPYFD_EXACT;
5136 newfd = dup2(from, to);
5138 newfd = fcntl(from, F_DUPFD, to);
5141 if (errno == EMFILE)
5143 /* Happens when source fd is not open: try "echo >&99" */
5144 ash_msg_and_raise_error("%d: %m", from);
5149 /* Struct def and variable are moved down to the first usage site */
5154 struct redirtab *next;
5157 struct two_fd_t two_fd[];
5159 #define redirlist (G_var.redirlist)
5161 static int need_to_remember(struct redirtab *rp, int fd)
5165 if (!rp) /* remembering was not requested */
5168 for (i = 0; i < rp->pair_count; i++) {
5169 if (rp->two_fd[i].orig == fd) {
5170 /* already remembered */
5177 /* "hidden" fd is a fd used to read scripts, or a copy of such */
5178 static int is_hidden_fd(struct redirtab *rp, int fd)
5181 struct parsefile *pf;
5185 /* Check open scripts' fds */
5188 /* We skip pf_fd == 0 case because of the following case:
5189 * $ ash # running ash interactively
5191 * and in script.sh: "exec 9>&0".
5192 * Even though top-level pf_fd _is_ 0,
5193 * it's still ok to use it: "read" builtin uses it,
5194 * why should we cripple "exec" builtin?
5196 if (pf->pf_fd > 0 && fd == pf->pf_fd) {
5204 /* Check saved fds of redirects */
5205 fd |= COPYFD_RESTORE;
5206 for (i = 0; i < rp->pair_count; i++) {
5207 if (rp->two_fd[i].copy == fd) {
5215 * Process a list of redirection commands. If the REDIR_PUSH flag is set,
5216 * old file descriptors are stashed away so that the redirection can be
5217 * undone by calling popredir.
5219 /* flags passed to redirect */
5220 #define REDIR_PUSH 01 /* save previous values of file descriptors */
5221 #define REDIR_SAVEFD2 03 /* set preverrout */
5223 redirect(union node *redir, int flags)
5225 struct redirtab *sv;
5230 int copied_fd2 = -1;
5240 if (flags & REDIR_PUSH) {
5241 union node *tmp = redir;
5244 #if ENABLE_ASH_BASH_COMPAT
5245 if (tmp->nfile.type == NTO2)
5248 tmp = tmp->nfile.next;
5250 sv = ckmalloc(sizeof(*sv) + sv_pos * sizeof(sv->two_fd[0]));
5251 sv->next = redirlist;
5252 sv->pair_count = sv_pos;
5254 sv->nullredirs = g_nullredirs - 1;
5256 while (sv_pos > 0) {
5258 sv->two_fd[sv_pos].orig = sv->two_fd[sv_pos].copy = EMPTY;
5264 fd = redir->nfile.fd;
5265 if (redir->nfile.type == NTOFD || redir->nfile.type == NFROMFD) {
5266 right_fd = redir->ndup.dupfd;
5267 //bb_error_msg("doing %d > %d", fd, right_fd);
5268 /* redirect from/to same file descriptor? */
5271 /* "echo >&10" and 10 is a fd opened to a sh script? */
5272 if (is_hidden_fd(sv, right_fd)) {
5273 errno = EBADF; /* as if it is closed */
5274 ash_msg_and_raise_error("%d: %m", right_fd);
5278 newfd = openredirect(redir); /* always >= 0 */
5280 /* Descriptor wasn't open before redirect.
5281 * Mark it for close in the future */
5282 if (need_to_remember(sv, fd)) {
5283 goto remember_to_close;
5288 #if ENABLE_ASH_BASH_COMPAT
5291 if (need_to_remember(sv, fd)) {
5292 /* Copy old descriptor */
5293 /* Careful to not accidentally "save"
5294 * to the same fd as right side fd in N>&M */
5295 int minfd = right_fd < 10 ? 10 : right_fd + 1;
5296 i = fcntl(fd, F_DUPFD, minfd);
5297 /* You'd expect copy to be CLOEXECed. Currently these extra "saved" fds
5298 * are closed in popredir() in the child, preventing them from leaking
5299 * into child. (popredir() also cleans up the mess in case of failures)
5304 /* Strange error (e.g. "too many files" EMFILE?) */
5308 ash_msg_and_raise_error("%d: %m", fd);
5311 /* EBADF: it is not open - good, remember to close it */
5314 } else { /* fd is open, save its copy */
5315 /* "exec fd>&-" should not close fds
5316 * which point to script file(s).
5317 * Force them to be restored afterwards */
5318 if (is_hidden_fd(sv, fd))
5319 i |= COPYFD_RESTORE;
5323 sv->two_fd[sv_pos].orig = fd;
5324 sv->two_fd[sv_pos].copy = i;
5328 /* NTOFD/NFROMFD: copy redir->ndup.dupfd to fd */
5329 if (redir->ndup.dupfd < 0) { /* "fd>&-" */
5330 /* Don't want to trigger debugging */
5334 copyfd(redir->ndup.dupfd, fd | COPYFD_EXACT);
5336 } else if (fd != newfd) { /* move newfd to fd */
5337 copyfd(newfd, fd | COPYFD_EXACT);
5338 #if ENABLE_ASH_BASH_COMPAT
5339 if (!(redir->nfile.type == NTO2 && fd == 2))
5343 #if ENABLE_ASH_BASH_COMPAT
5344 if (redir->nfile.type == NTO2 && fd == 1) {
5345 /* We already redirected it to fd 1, now copy it to 2 */
5351 } while ((redir = redir->nfile.next) != NULL);
5354 if ((flags & REDIR_SAVEFD2) && copied_fd2 >= 0)
5355 preverrout_fd = copied_fd2;
5359 * Undo the effects of the last redirection.
5362 popredir(int drop, int restore)
5364 struct redirtab *rp;
5367 if (--g_nullredirs >= 0)
5371 for (i = 0; i < rp->pair_count; i++) {
5372 int fd = rp->two_fd[i].orig;
5373 int copy = rp->two_fd[i].copy;
5374 if (copy == CLOSED) {
5379 if (copy != EMPTY) {
5380 if (!drop || (restore && (copy & COPYFD_RESTORE))) {
5381 copy &= ~COPYFD_RESTORE;
5383 copyfd(copy, fd | COPYFD_EXACT);
5385 close(copy & ~COPYFD_RESTORE);
5388 redirlist = rp->next;
5389 g_nullredirs = rp->nullredirs;
5395 * Undo all redirections. Called on error or interrupt.
5399 * Discard all saved file descriptors.
5402 clearredir(int drop)
5408 popredir(drop, /*restore:*/ 0);
5413 redirectsafe(union node *redir, int flags)
5416 volatile int saveint;
5417 struct jmploc *volatile savehandler = exception_handler;
5418 struct jmploc jmploc;
5421 /* "echo 9>/dev/null; echo >&9; echo result: $?" - result should be 1, not 2! */
5422 err = setjmp(jmploc.loc); // huh?? was = setjmp(jmploc.loc) * 2;
5424 exception_handler = &jmploc;
5425 redirect(redir, flags);
5427 exception_handler = savehandler;
5428 if (err && exception_type != EXERROR)
5429 longjmp(exception_handler->loc, 1);
5430 RESTORE_INT(saveint);
5435 /* ============ Routines to expand arguments to commands
5437 * We have to deal with backquotes, shell variables, and file metacharacters.
5440 #if ENABLE_SH_MATH_SUPPORT
5442 ash_arith(const char *s)
5444 arith_eval_hooks_t math_hooks;
5448 math_hooks.lookupvar = lookupvar;
5449 math_hooks.setvar = setvar2;
5450 //math_hooks.endofname = endofname;
5453 result = arith(s, &errcode, &math_hooks);
5456 ash_msg_and_raise_error("exponent less than 0");
5458 ash_msg_and_raise_error("divide by zero");
5460 ash_msg_and_raise_error("expression recursion loop detected");
5461 raise_error_syntax(s);
5472 #define EXP_FULL 0x1 /* perform word splitting & file globbing */
5473 #define EXP_TILDE 0x2 /* do normal tilde expansion */
5474 #define EXP_VARTILDE 0x4 /* expand tildes in an assignment */
5475 #define EXP_REDIR 0x8 /* file glob for a redirection (1 match only) */
5476 #define EXP_CASE 0x10 /* keeps quotes around for CASE pattern */
5477 #define EXP_RECORD 0x20 /* need to record arguments for ifs breakup */
5478 #define EXP_VARTILDE2 0x40 /* expand tildes after colons only */
5479 #define EXP_WORD 0x80 /* expand word in parameter expansion */
5480 #define EXP_QWORD 0x100 /* expand word in quoted parameter expansion */
5484 #define RMESCAPE_ALLOC 0x1 /* Allocate a new string */
5485 #define RMESCAPE_GLOB 0x2 /* Add backslashes for glob */
5486 #define RMESCAPE_QUOTED 0x4 /* Remove CTLESC unless in quotes */
5487 #define RMESCAPE_GROW 0x8 /* Grow strings instead of stalloc */
5488 #define RMESCAPE_HEAP 0x10 /* Malloc strings instead of stalloc */
5491 * Structure specifying which parts of the string should be searched
5492 * for IFS characters.
5495 struct ifsregion *next; /* next region in list */
5496 int begoff; /* offset of start of region */
5497 int endoff; /* offset of end of region */
5498 int nulonly; /* search for nul bytes only */
5502 struct strlist *list;
5503 struct strlist **lastp;
5506 /* output of current string */
5507 static char *expdest;
5508 /* list of back quote expressions */
5509 static struct nodelist *argbackq;
5510 /* first struct in list of ifs regions */
5511 static struct ifsregion ifsfirst;
5512 /* last struct in list */
5513 static struct ifsregion *ifslastp;
5514 /* holds expanded arg list */
5515 static struct arglist exparg;
5525 expdest = makestrspace(32, expdest);
5526 len = fmtstr(expdest, 32, arith_t_fmt, num);
5527 STADJUST(len, expdest);
5532 esclen(const char *start, const char *p)
5536 while (p > start && (unsigned char)*--p == CTLESC) {
5543 * Remove any CTLESC characters from a string.
5546 rmescapes(char *str, int flag)
5548 static const char qchars[] ALIGN1 = { CTLESC, CTLQUOTEMARK, '\0' };
5552 unsigned protect_against_glob;
5555 p = strpbrk(str, qchars);
5561 if (flag & RMESCAPE_ALLOC) {
5562 size_t len = p - str;
5563 size_t fulllen = len + strlen(p) + 1;
5565 if (flag & RMESCAPE_GROW) {
5566 int strloc = str - (char *)stackblock();
5567 r = makestrspace(fulllen, expdest);
5568 /* p and str may be invalidated by makestrspace */
5569 str = (char *)stackblock() + strloc;
5571 } else if (flag & RMESCAPE_HEAP) {
5572 r = ckmalloc(fulllen);
5574 r = stalloc(fulllen);
5578 q = (char *)memcpy(q, str, len) + len;
5582 inquotes = (flag & RMESCAPE_QUOTED) ^ RMESCAPE_QUOTED;
5583 globbing = flag & RMESCAPE_GLOB;
5584 protect_against_glob = globbing;
5586 if ((unsigned char)*p == CTLQUOTEMARK) {
5587 // TODO: if no RMESCAPE_QUOTED in flags, inquotes never becomes 0
5588 // (alternates between RMESCAPE_QUOTED and ~RMESCAPE_QUOTED). Is it ok?
5589 // Note: both inquotes and protect_against_glob only affect whether
5590 // CTLESC,<ch> gets converted to <ch> or to \<ch>
5591 inquotes = ~inquotes;
5593 protect_against_glob = globbing;
5597 /* naked back slash */
5598 protect_against_glob = 0;
5601 if ((unsigned char)*p == CTLESC) {
5603 if (protect_against_glob && inquotes && *p != '/') {
5607 protect_against_glob = globbing;
5612 if (flag & RMESCAPE_GROW) {
5614 STADJUST(q - r + 1, expdest);
5618 #define pmatch(a, b) !fnmatch((a), (b), 0)
5621 * Prepare a pattern for a expmeta (internal glob(3)) call.
5623 * Returns an stalloced string.
5626 preglob(const char *pattern, int quoted, int flag)
5628 flag |= RMESCAPE_GLOB;
5630 flag |= RMESCAPE_QUOTED;
5632 return rmescapes((char *)pattern, flag);
5636 * Put a string on the stack.
5639 memtodest(const char *p, size_t len, int syntax, int quotes)
5643 q = makestrspace(quotes ? len * 2 : len, q);
5646 unsigned char c = *p++;
5650 int n = SIT(c, syntax);
5651 if (n == CCTL || n == CBACK)
5661 strtodest(const char *p, int syntax, int quotes)
5663 memtodest(p, strlen(p), syntax, quotes);
5667 * Record the fact that we have to scan this region of the
5668 * string for IFS characters.
5671 recordregion(int start, int end, int nulonly)
5673 struct ifsregion *ifsp;
5675 if (ifslastp == NULL) {
5679 ifsp = ckzalloc(sizeof(*ifsp));
5680 /*ifsp->next = NULL; - ckzalloc did it */
5681 ifslastp->next = ifsp;
5685 ifslastp->begoff = start;
5686 ifslastp->endoff = end;
5687 ifslastp->nulonly = nulonly;
5691 removerecordregions(int endoff)
5693 if (ifslastp == NULL)
5696 if (ifsfirst.endoff > endoff) {
5697 while (ifsfirst.next) {
5698 struct ifsregion *ifsp;
5700 ifsp = ifsfirst.next->next;
5701 free(ifsfirst.next);
5702 ifsfirst.next = ifsp;
5705 if (ifsfirst.begoff > endoff) {
5708 ifslastp = &ifsfirst;
5709 ifsfirst.endoff = endoff;
5714 ifslastp = &ifsfirst;
5715 while (ifslastp->next && ifslastp->next->begoff < endoff)
5716 ifslastp = ifslastp->next;
5717 while (ifslastp->next) {
5718 struct ifsregion *ifsp;
5720 ifsp = ifslastp->next->next;
5721 free(ifslastp->next);
5722 ifslastp->next = ifsp;
5725 if (ifslastp->endoff > endoff)
5726 ifslastp->endoff = endoff;
5730 exptilde(char *startp, char *p, int flags)
5736 int quotes = flags & (EXP_FULL | EXP_CASE | EXP_REDIR);
5741 while ((c = *++p) != '\0') {
5748 if (flags & EXP_VARTILDE)
5758 if (*name == '\0') {
5759 home = lookupvar("HOME");
5761 pw = getpwnam(name);
5766 if (!home || !*home)
5769 startloc = expdest - (char *)stackblock();
5770 strtodest(home, SQSYNTAX, quotes);
5771 recordregion(startloc, expdest - (char *)stackblock(), 0);
5779 * Execute a command inside back quotes. If it's a builtin command, we
5780 * want to save its output in a block obtained from malloc. Otherwise
5781 * we fork off a subprocess and get the output of the command via a pipe.
5782 * Should be called with interrupts off.
5784 struct backcmd { /* result of evalbackcmd */
5785 int fd; /* file descriptor to read from */
5786 int nleft; /* number of chars in buffer */
5787 char *buf; /* buffer */
5788 struct job *jp; /* job structure for command */
5791 /* These forward decls are needed to use "eval" code for backticks handling: */
5792 static uint8_t back_exitstatus; /* exit status of backquoted command */
5793 #define EV_EXIT 01 /* exit after evaluating tree */
5794 static void evaltree(union node *, int);
5796 static void FAST_FUNC
5797 evalbackcmd(union node *n, struct backcmd *result)
5808 saveherefd = herefd;
5816 ash_msg_and_raise_error("pipe call failed");
5817 jp = makejob(/*n,*/ 1);
5818 if (forkshell(jp, n, FORK_NOJOB) == 0) {
5823 copyfd(pip[1], 1 | COPYFD_EXACT);
5827 evaltree(n, EV_EXIT); /* actually evaltreenr... */
5831 result->fd = pip[0];
5834 herefd = saveherefd;
5836 TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n",
5837 result->fd, result->buf, result->nleft, result->jp));
5841 * Expand stuff in backwards quotes.
5844 expbackq(union node *cmd, int quoted, int quotes)
5852 int syntax = quoted ? DQSYNTAX : BASESYNTAX;
5853 struct stackmark smark;
5856 setstackmark(&smark);
5858 startloc = dest - (char *)stackblock();
5860 evalbackcmd(cmd, &in);
5861 popstackmark(&smark);
5868 memtodest(p, i, syntax, quotes);
5872 i = nonblock_safe_read(in.fd, buf, sizeof(buf));
5873 TRACE(("expbackq: read returns %d\n", i));
5882 back_exitstatus = waitforjob(in.jp);
5886 /* Eat all trailing newlines */
5888 for (; dest > (char *)stackblock() && dest[-1] == '\n';)
5893 recordregion(startloc, dest - (char *)stackblock(), 0);
5894 TRACE(("evalbackq: size:%d:'%.*s'\n",
5895 (int)((dest - (char *)stackblock()) - startloc),
5896 (int)((dest - (char *)stackblock()) - startloc),
5897 stackblock() + startloc));
5900 #if ENABLE_SH_MATH_SUPPORT
5902 * Expand arithmetic expression. Backup to start of expression,
5903 * evaluate, place result in (backed up) result, adjust string position.
5916 * This routine is slightly over-complicated for
5917 * efficiency. Next we scan backwards looking for the
5918 * start of arithmetic.
5920 start = stackblock();
5927 while ((unsigned char)*p != CTLARI) {
5931 ash_msg_and_raise_error("missing CTLARI (shouldn't happen)");
5936 esc = esclen(start, p);
5946 removerecordregions(begoff);
5953 rmescapes(p + 2, 0);
5955 len = cvtnum(ash_arith(p + 2));
5958 recordregion(begoff, begoff + len, 0);
5962 /* argstr needs it */
5963 static char *evalvar(char *p, int flags, struct strlist *var_str_list);
5966 * Perform variable and command substitution. If EXP_FULL is set, output CTLESC
5967 * characters to allow for further processing. Otherwise treat
5968 * $@ like $* since no splitting will be performed.
5970 * var_str_list (can be NULL) is a list of "VAR=val" strings which take precedence
5971 * over shell varables. Needed for "A=a B=$A; echo $B" case - we use it
5972 * for correct expansion of "B=$A" word.
5975 argstr(char *p, int flags, struct strlist *var_str_list)
5977 static const char spclchars[] ALIGN1 = {
5985 CTLBACKQ | CTLQUOTE,
5986 #if ENABLE_SH_MATH_SUPPORT
5991 const char *reject = spclchars;
5992 int quotes = flags & (EXP_FULL | EXP_CASE | EXP_REDIR); /* do CTLESC */
5993 int breakall = flags & EXP_WORD;
5998 if (!(flags & EXP_VARTILDE)) {
6000 } else if (flags & EXP_VARTILDE2) {
6005 if (flags & EXP_TILDE) {
6008 flags &= ~EXP_TILDE;
6011 if ((unsigned char)*q == CTLESC && (flags & EXP_QWORD))
6014 p = exptilde(p, q, flags);
6017 startloc = expdest - (char *)stackblock();
6021 length += strcspn(p + length, reject);
6025 #if ENABLE_SH_MATH_SUPPORT
6029 /* c == '=' || c == ':' || c == CTLENDARI */
6035 expdest = stack_nputstr(p, length, expdest);
6036 newloc = expdest - (char *)stackblock();
6037 if (breakall && !inquotes && newloc > startloc) {
6038 recordregion(startloc, newloc, 0);
6049 if (flags & EXP_VARTILDE2) {
6053 flags |= EXP_VARTILDE2;
6058 * sort of a hack - expand tildes in variable
6059 * assignments (after the first '=' and after ':'s).
6068 case CTLENDVAR: /* ??? */
6071 /* "$@" syntax adherence hack */
6073 && memcmp(p, dolatstr, 4) == 0
6074 && ( p[4] == (char)CTLQUOTEMARK
6075 || (p[4] == (char)CTLENDVAR && p[5] == (char)CTLQUOTEMARK)
6078 p = evalvar(p + 1, flags, /* var_str_list: */ NULL) + 1;
6081 inquotes = !inquotes;
6094 p = evalvar(p, flags, var_str_list);
6098 case CTLBACKQ|CTLQUOTE:
6099 expbackq(argbackq->n, c, quotes);
6100 argbackq = argbackq->next;
6102 #if ENABLE_SH_MATH_SUPPORT
6115 scanleft(char *startp, char *rmesc, char *rmescend UNUSED_PARAM,
6116 char *pattern, int quotes, int zero)
6125 const char *s = loc2;
6132 match = pmatch(pattern, s);
6137 if (quotes && (unsigned char)*loc == CTLESC)
6146 scanright(char *startp, char *rmesc, char *rmescend,
6147 char *pattern, int quotes, int match_at_start)
6149 #if !ENABLE_ASH_OPTIMIZE_FOR_SIZE
6150 int try2optimize = match_at_start;
6156 /* If we called by "${v/pattern/repl}" or "${v//pattern/repl}":
6157 * startp="escaped_value_of_v" rmesc="raw_value_of_v"
6158 * rmescend=""(ptr to NUL in rmesc) pattern="pattern" quotes=match_at_start=1
6160 * loc starts at NUL at the end of startp, loc2 starts at the end of rmesc,
6161 * and on each iteration they go back two/one char until they reach the beginning.
6162 * We try to find a match in "raw_value_of_v", "raw_value_of_", "raw_value_of" etc.
6164 /* TODO: document in what other circumstances we are called. */
6166 for (loc = pattern - 1, loc2 = rmescend; loc >= startp; loc2--) {
6169 const char *s = loc2;
6170 if (match_at_start) {
6174 match = pmatch(pattern, s);
6175 //bb_error_msg("pmatch(pattern:'%s',s:'%s'):%d", pattern, s, match);
6179 #if !ENABLE_ASH_OPTIMIZE_FOR_SIZE
6181 /* Maybe we can optimize this:
6182 * if pattern ends with unescaped *, we can avoid checking
6183 * shorter strings: if "foo*" doesnt match "raw_value_of_v",
6184 * it wont match truncated "raw_value_of_" strings too.
6186 unsigned plen = strlen(pattern);
6187 /* Does it end with "*"? */
6188 if (plen != 0 && pattern[--plen] == '*') {
6189 /* "xxxx*" is not escaped */
6190 /* "xxx\*" is escaped */
6191 /* "xx\\*" is not escaped */
6192 /* "x\\\*" is escaped */
6194 while (plen != 0 && pattern[--plen] == '\\')
6197 break; /* ends with unescaped "*" */
6205 esc = esclen(startp, loc);
6216 static void varunset(const char *, const char *, const char *, int) NORETURN;
6218 varunset(const char *end, const char *var, const char *umsg, int varflags)
6224 msg = "parameter not set";
6226 if ((unsigned char)*end == CTLENDVAR) {
6227 if (varflags & VSNUL)
6233 ash_msg_and_raise_error("%.*s: %s%s", (int)(end - var - 1), var, msg, tail);
6236 #if ENABLE_ASH_BASH_COMPAT
6238 parse_sub_pattern(char *arg, int varflags)
6240 char *idx, *repl = NULL;
6243 //char *org_arg = arg;
6244 //bb_error_msg("arg:'%s' varflags:%x", arg, varflags);
6251 /* Only the first '/' seen is our separator */
6260 * Example: v='ab\c'; echo ${v/\\b/_\\_\z_}
6261 * The result is a_\_z_c (not a\_\_z_c)!
6263 * Enable debug prints in this function and you'll see:
6264 * ash: arg:'\\b/_\\_z_' varflags:d
6265 * ash: pattern:'\\b' repl:'_\_z_'
6266 * That is, \\b is interpreted as \\b, but \\_ as \_!
6267 * IOW: search pattern and replace string treat backslashes
6268 * differently! That is the reason why we check repl below:
6270 if (c == '\\' && *arg == '\\' && repl && !(varflags & VSQUOTE))
6271 arg++; /* skip both '\', not just first one */
6274 //bb_error_msg("pattern:'%s' repl:'%s'", org_arg, repl);
6278 #endif /* ENABLE_ASH_BASH_COMPAT */
6281 subevalvar(char *p, char *varname, int strloc, int subtype,
6282 int startloc, int varflags, int quotes, struct strlist *var_str_list)
6284 struct nodelist *saveargbackq = argbackq;
6287 char *rmesc, *rmescend;
6289 IF_ASH_BASH_COMPAT(const char *repl = NULL;)
6290 IF_ASH_BASH_COMPAT(int pos, len, orig_len;)
6291 int saveherefd = herefd;
6292 int amount, workloc, resetloc;
6294 char *(*scan)(char*, char*, char*, char*, int, int);
6296 //bb_error_msg("subevalvar(p:'%s',varname:'%s',strloc:%d,subtype:%d,startloc:%d,varflags:%x,quotes:%d)",
6297 // p, varname, strloc, subtype, startloc, varflags, quotes);
6300 argstr(p, (subtype != VSASSIGN && subtype != VSQUESTION) ? EXP_CASE : 0,
6302 STPUTC('\0', expdest);
6303 herefd = saveherefd;
6304 argbackq = saveargbackq;
6305 startp = (char *)stackblock() + startloc;
6309 setvar(varname, startp, 0);
6310 amount = startp - expdest;
6311 STADJUST(amount, expdest);
6315 varunset(p, varname, startp, varflags);
6318 #if ENABLE_ASH_BASH_COMPAT
6320 loc = str = stackblock() + strloc;
6321 /* Read POS in ${var:POS:LEN} */
6322 pos = atoi(loc); /* number(loc) errors out on "1:4" */
6323 len = str - startp - 1;
6325 /* *loc != '\0', guaranteed by parser */
6329 /* Adjust the length by the number of escapes */
6330 for (ptr = startp; ptr < (str - 1); ptr++) {
6331 if ((unsigned char)*ptr == CTLESC) {
6339 if (*loc++ == ':') {
6343 /* Skip POS in ${var:POS:LEN} */
6345 while (*loc && *loc != ':') {
6347 * bash complains on: var=qwe; echo ${var:1a:123}
6349 ash_msg_and_raise_error(msg_illnum, str);
6353 if (*loc++ == ':') {
6357 if (pos >= orig_len) {
6361 if (len > (orig_len - pos))
6362 len = orig_len - pos;
6364 for (str = startp; pos; str++, pos--) {
6365 if (quotes && (unsigned char)*str == CTLESC)
6368 for (loc = startp; len; len--) {
6369 if (quotes && (unsigned char)*str == CTLESC)
6374 amount = loc - expdest;
6375 STADJUST(amount, expdest);
6380 resetloc = expdest - (char *)stackblock();
6382 /* We'll comeback here if we grow the stack while handling
6383 * a VSREPLACE or VSREPLACEALL, since our pointers into the
6384 * stack will need rebasing, and we'll need to remove our work
6387 IF_ASH_BASH_COMPAT(restart:)
6389 amount = expdest - ((char *)stackblock() + resetloc);
6390 STADJUST(-amount, expdest);
6391 startp = (char *)stackblock() + startloc;
6394 rmescend = (char *)stackblock() + strloc;
6396 rmesc = rmescapes(startp, RMESCAPE_ALLOC | RMESCAPE_GROW);
6397 if (rmesc != startp) {
6399 startp = (char *)stackblock() + startloc;
6403 str = (char *)stackblock() + strloc;
6404 preglob(str, varflags & VSQUOTE, 0);
6405 workloc = expdest - (char *)stackblock();
6407 #if ENABLE_ASH_BASH_COMPAT
6408 if (subtype == VSREPLACE || subtype == VSREPLACEALL) {
6412 repl = parse_sub_pattern(str, varflags);
6413 //bb_error_msg("repl:'%s'", repl);
6418 /* If there's no pattern to match, return the expansion unmolested */
6427 loc = scanright(idx, rmesc, rmescend, str, quotes, 1);
6428 //bb_error_msg("scanright('%s'):'%s'", str, loc);
6430 /* No match, advance */
6431 char *restart_detect = stackblock();
6433 STPUTC(*idx, expdest);
6434 if (quotes && (unsigned char)*idx == CTLESC) {
6437 STPUTC(*idx, expdest);
6439 if (stackblock() != restart_detect)
6444 /* continue; - prone to quadratic behavior, smarter code: */
6447 if (str[0] == '*') {
6448 /* Pattern is "*foo". If "*foo" does not match "long_string",
6449 * it would never match "ong_string" etc, no point in trying.
6456 if (subtype == VSREPLACEALL) {
6458 if (quotes && (unsigned char)*idx == CTLESC)
6467 //bb_error_msg("repl:'%s'", repl);
6468 for (loc = (char*)repl; *loc; loc++) {
6469 char *restart_detect = stackblock();
6470 if (quotes && *loc == '\\') {
6471 STPUTC(CTLESC, expdest);
6474 STPUTC(*loc, expdest);
6475 if (stackblock() != restart_detect)
6480 if (subtype == VSREPLACE) {
6481 //bb_error_msg("tail:'%s', quotes:%x", idx, quotes);
6483 char *restart_detect = stackblock();
6484 STPUTC(*idx, expdest);
6485 if (stackblock() != restart_detect)
6494 /* We've put the replaced text into a buffer at workloc, now
6495 * move it to the right place and adjust the stack.
6497 STPUTC('\0', expdest);
6498 startp = (char *)stackblock() + startloc;
6499 memmove(startp, (char *)stackblock() + workloc, len + 1);
6500 //bb_error_msg("startp:'%s'", startp);
6501 amount = expdest - (startp + len);
6502 STADJUST(-amount, expdest);
6505 #endif /* ENABLE_ASH_BASH_COMPAT */
6507 subtype -= VSTRIMRIGHT;
6509 if (subtype < 0 || subtype > 7)
6512 /* zero = (subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX) */
6513 zero = subtype >> 1;
6514 /* VSTRIMLEFT/VSTRIMRIGHTMAX -> scanleft */
6515 scan = (subtype & 1) ^ zero ? scanleft : scanright;
6517 loc = scan(startp, rmesc, rmescend, str, quotes, zero);
6520 memmove(startp, loc, str - loc);
6521 loc = startp + (str - loc) - 1;
6524 amount = loc - expdest;
6525 STADJUST(amount, expdest);
6531 * Add the value of a specialized variable to the stack string.
6532 * name parameter (examples):
6533 * ash -c 'echo $1' name:'1='
6534 * ash -c 'echo $qwe' name:'qwe='
6535 * ash -c 'echo $$' name:'$='
6536 * ash -c 'echo ${$}' name:'$='
6537 * ash -c 'echo ${$##q}' name:'$=q'
6538 * ash -c 'echo ${#$}' name:'$='
6539 * note: examples with bad shell syntax:
6540 * ash -c 'echo ${#$1}' name:'$=1'
6541 * ash -c 'echo ${#1#}' name:'1=#'
6543 static NOINLINE ssize_t
6544 varvalue(char *name, int varflags, int flags, struct strlist *var_str_list)
6551 int subtype = varflags & VSTYPE;
6552 int quotes = flags & (EXP_FULL | EXP_CASE | EXP_REDIR);
6553 int quoted = varflags & VSQUOTE;
6554 int syntax = quoted ? DQSYNTAX : BASESYNTAX;
6564 num = shellparam.nparam;
6572 goto check_1char_name;
6574 expdest = makestrspace(NOPTS, expdest);
6575 for (i = NOPTS - 1; i >= 0; i--) {
6577 USTPUTC(optletters(i), expdest);
6583 /* handles cases similar to ${#$1} */
6584 if (name[2] != '\0')
6585 raise_error_syntax("bad substitution");
6592 if (quoted && (flags & EXP_FULL)) {
6593 /* note: this is not meant as PEOF value */
6594 sep = 1 << CHAR_BIT;
6599 sep = ifsset() ? (unsigned char)(ifsval()[0]) : ' ';
6600 i = SIT(sep, syntax);
6601 if (quotes && (i == CCTL || i == CBACK))
6607 while ((p = *ap++) != NULL) {
6610 partlen = strlen(p);
6613 if (!(subtype == VSPLUS || subtype == VSLENGTH))
6614 memtodest(p, partlen, syntax, quotes);
6620 if (subtype == VSPLUS || subtype == VSLENGTH) {
6626 /* note: may put NUL despite sep != 0
6627 * (see sep = 1 << CHAR_BIT above) */
6633 } /* case '@' and '*' */
6644 num = atoi(name); /* number(name) fails on ${N#str} etc */
6645 if (num < 0 || num > shellparam.nparam)
6647 p = num ? shellparam.p[num - 1] : arg0;
6650 /* NB: name has form "VAR=..." */
6652 /* "A=a B=$A" case: var_str_list is a list of "A=a" strings
6653 * which should be considered before we check variables. */
6655 unsigned name_len = (strchrnul(name, '=') - name) + 1;
6659 str = var_str_list->text;
6660 eq = strchr(str, '=');
6661 if (!eq) /* stop at first non-assignment */
6664 if (name_len == (unsigned)(eq - str)
6665 && strncmp(str, name, name_len) == 0
6668 /* goto value; - WRONG! */
6669 /* think "A=1 A=2 B=$A" */
6671 var_str_list = var_str_list->next;
6672 } while (var_str_list);
6676 p = lookupvar(name);
6682 if (!(subtype == VSPLUS || subtype == VSLENGTH))
6683 memtodest(p, len, syntax, quotes);
6687 if (subtype == VSPLUS || subtype == VSLENGTH)
6688 STADJUST(-len, expdest);
6693 * Expand a variable, and return a pointer to the next character in the
6697 evalvar(char *p, int flags, struct strlist *var_str_list)
6708 varflags = (unsigned char) *p++;
6709 subtype = varflags & VSTYPE;
6710 quoted = varflags & VSQUOTE;
6712 easy = (!quoted || (*var == '@' && shellparam.nparam));
6713 startloc = expdest - (char *)stackblock();
6714 p = strchr(p, '=') + 1; //TODO: use var_end(p)?
6717 varlen = varvalue(var, varflags, flags, var_str_list);
6718 if (varflags & VSNUL)
6721 if (subtype == VSPLUS) {
6722 varlen = -1 - varlen;
6726 if (subtype == VSMINUS) {
6731 flags | (quoted ? EXP_TILDE|EXP_QWORD : EXP_TILDE|EXP_WORD),
6741 if (subtype == VSASSIGN || subtype == VSQUESTION) {
6743 if (subevalvar(p, var, /* strloc: */ 0,
6744 subtype, startloc, varflags,
6750 * Remove any recorded regions beyond
6753 removerecordregions(startloc);
6763 if (varlen < 0 && uflag)
6764 varunset(p, var, 0, 0);
6766 if (subtype == VSLENGTH) {
6767 cvtnum(varlen > 0 ? varlen : 0);
6771 if (subtype == VSNORMAL) {
6782 case VSTRIMRIGHTMAX:
6783 #if ENABLE_ASH_BASH_COMPAT
6796 * Terminate the string and start recording the pattern
6799 STPUTC('\0', expdest);
6800 patloc = expdest - (char *)stackblock();
6801 if (NULL == subevalvar(p, /* varname: */ NULL, patloc, subtype,
6803 //TODO: | EXP_REDIR too? All other such places do it too
6804 /* quotes: */ flags & (EXP_FULL | EXP_CASE),
6807 int amount = expdest - (
6808 (char *)stackblock() + patloc - 1
6810 STADJUST(-amount, expdest);
6812 /* Remove any recorded regions beyond start of variable */
6813 removerecordregions(startloc);
6815 recordregion(startloc, expdest - (char *)stackblock(), quoted);
6819 if (subtype != VSNORMAL) { /* skip to end of alternative */
6822 unsigned char c = *p++;
6825 else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) {
6827 argbackq = argbackq->next;
6828 } else if (c == CTLVAR) {
6829 if ((*p++ & VSTYPE) != VSNORMAL)
6831 } else if (c == CTLENDVAR) {
6841 * Break the argument string into pieces based upon IFS and add the
6842 * strings to the argument list. The regions of the string to be
6843 * searched for IFS characters have been stored by recordregion.
6846 ifsbreakup(char *string, struct arglist *arglist)
6848 struct ifsregion *ifsp;
6853 const char *ifs, *realifs;
6858 if (ifslastp != NULL) {
6861 realifs = ifsset() ? ifsval() : defifs;
6864 p = string + ifsp->begoff;
6865 nulonly = ifsp->nulonly;
6866 ifs = nulonly ? nullstr : realifs;
6868 while (p < string + ifsp->endoff) {
6870 if ((unsigned char)*p == CTLESC)
6872 if (!strchr(ifs, *p)) {
6877 ifsspc = (strchr(defifs, *p) != NULL);
6878 /* Ignore IFS whitespace at start */
6879 if (q == start && ifsspc) {
6885 sp = stzalloc(sizeof(*sp));
6887 *arglist->lastp = sp;
6888 arglist->lastp = &sp->next;
6892 if (p >= string + ifsp->endoff) {
6896 if ((unsigned char)*p == CTLESC)
6898 if (strchr(ifs, *p) == NULL) {
6902 if (strchr(defifs, *p) == NULL) {
6917 } while (ifsp != NULL);
6926 sp = stzalloc(sizeof(*sp));
6928 *arglist->lastp = sp;
6929 arglist->lastp = &sp->next;
6935 struct ifsregion *p;
6940 struct ifsregion *ifsp;
6946 ifsfirst.next = NULL;
6951 * Add a file name to the list.
6954 addfname(const char *name)
6958 sp = stzalloc(sizeof(*sp));
6959 sp->text = ststrdup(name);
6961 exparg.lastp = &sp->next;
6965 * Do metacharacter (i.e. *, ?, [...]) expansion.
6968 expmeta(char *expdir, char *enddir, char *name)
6983 for (p = name; *p; p++) {
6984 if (*p == '*' || *p == '?')
6986 else if (*p == '[') {
6993 if (*q == '/' || *q == '\0')
7000 } else if (*p == '\\')
7002 else if (*p == '/') {
7009 if (metaflag == 0) { /* we've reached the end of the file name */
7010 if (enddir != expdir)
7018 if (metaflag == 0 || lstat(expdir, &statb) >= 0)
7029 } while (p < start);
7031 if (enddir == expdir) {
7033 } else if (enddir == expdir + 1 && *expdir == '/') {
7042 if (enddir != expdir)
7044 if (*endname == 0) {
7056 while (!pending_int && (dp = readdir(dirp)) != NULL) {
7057 if (dp->d_name[0] == '.' && !matchdot)
7059 if (pmatch(start, dp->d_name)) {
7061 strcpy(enddir, dp->d_name);
7064 for (p = enddir, cp = dp->d_name; (*p++ = *cp++) != '\0';)
7067 expmeta(expdir, p, endname);
7076 static struct strlist *
7077 msort(struct strlist *list, int len)
7079 struct strlist *p, *q = NULL;
7080 struct strlist **lpp;
7088 for (n = half; --n >= 0;) {
7092 q->next = NULL; /* terminate first half of list */
7093 q = msort(list, half); /* sort first half of list */
7094 p = msort(p, len - half); /* sort second half */
7097 #if ENABLE_LOCALE_SUPPORT
7098 if (strcoll(p->text, q->text) < 0)
7100 if (strcmp(p->text, q->text) < 0)
7124 * Sort the results of file name expansion. It calculates the number of
7125 * strings to sort and then calls msort (short for merge sort) to do the
7128 static struct strlist *
7129 expsort(struct strlist *str)
7135 for (sp = str; sp; sp = sp->next)
7137 return msort(str, len);
7141 expandmeta(struct strlist *str /*, int flag*/)
7143 static const char metachars[] ALIGN1 = {
7146 /* TODO - EXP_REDIR */
7150 struct strlist **savelastp;
7156 if (!strpbrk(str->text, metachars))
7158 savelastp = exparg.lastp;
7161 p = preglob(str->text, 0, RMESCAPE_ALLOC | RMESCAPE_HEAP);
7163 int i = strlen(str->text);
7164 expdir = ckmalloc(i < 2048 ? 2048 : i); /* XXX */
7166 expmeta(expdir, expdir, p);
7171 if (exparg.lastp == savelastp) {
7176 *exparg.lastp = str;
7177 rmescapes(str->text, 0);
7178 exparg.lastp = &str->next;
7180 *exparg.lastp = NULL;
7181 *savelastp = sp = expsort(*savelastp);
7182 while (sp->next != NULL)
7184 exparg.lastp = &sp->next;
7191 * Perform variable substitution and command substitution on an argument,
7192 * placing the resulting list of arguments in arglist. If EXP_FULL is true,
7193 * perform splitting and file name expansion. When arglist is NULL, perform
7194 * here document expansion.
7197 expandarg(union node *arg, struct arglist *arglist, int flag)
7202 argbackq = arg->narg.backquote;
7203 STARTSTACKSTR(expdest);
7204 ifsfirst.next = NULL;
7206 argstr(arg->narg.text, flag,
7207 /* var_str_list: */ arglist ? arglist->list : NULL);
7208 p = _STPUTC('\0', expdest);
7210 if (arglist == NULL) {
7211 return; /* here document expanded */
7213 p = grabstackstr(p);
7214 exparg.lastp = &exparg.list;
7218 if (flag & EXP_FULL) {
7219 ifsbreakup(p, &exparg);
7220 *exparg.lastp = NULL;
7221 exparg.lastp = &exparg.list;
7222 expandmeta(exparg.list /*, flag*/);
7224 if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */
7226 sp = stzalloc(sizeof(*sp));
7229 exparg.lastp = &sp->next;
7233 *exparg.lastp = NULL;
7235 *arglist->lastp = exparg.list;
7236 arglist->lastp = exparg.lastp;
7241 * Expand shell variables and backquotes inside a here document.
7244 expandhere(union node *arg, int fd)
7247 expandarg(arg, (struct arglist *)NULL, 0);
7248 full_write(fd, stackblock(), expdest - (char *)stackblock());
7252 * Returns true if the pattern matches the string.
7255 patmatch(char *pattern, const char *string)
7257 return pmatch(preglob(pattern, 0, 0), string);
7261 * See if a pattern matches in a case statement.
7264 casematch(union node *pattern, char *val)
7266 struct stackmark smark;
7269 setstackmark(&smark);
7270 argbackq = pattern->narg.backquote;
7271 STARTSTACKSTR(expdest);
7273 argstr(pattern->narg.text, EXP_TILDE | EXP_CASE,
7274 /* var_str_list: */ NULL);
7275 STACKSTRNUL(expdest);
7276 result = patmatch(stackblock(), val);
7277 popstackmark(&smark);
7282 /* ============ find_command */
7286 int (*builtin)(int, char **) FAST_FUNC;
7287 /* unsigned flags; */
7289 #define IS_BUILTIN_SPECIAL(b) ((b)->name[0] & 1)
7290 /* "regular" builtins always take precedence over commands,
7291 * regardless of PATH=....%builtin... position */
7292 #define IS_BUILTIN_REGULAR(b) ((b)->name[0] & 2)
7293 #define IS_BUILTIN_ASSIGN(b) ((b)->name[0] & 4)
7296 smallint cmdtype; /* CMDxxx */
7299 /* index >= 0 for commands without path (slashes) */
7300 /* (TODO: what exactly does the value mean? PATH position?) */
7301 /* index == -1 for commands with slashes */
7302 /* index == (-2 - applet_no) for NOFORK applets */
7303 const struct builtincmd *cmd;
7304 struct funcnode *func;
7307 /* values of cmdtype */
7308 #define CMDUNKNOWN -1 /* no entry in table for command */
7309 #define CMDNORMAL 0 /* command is an executable program */
7310 #define CMDFUNCTION 1 /* command is a shell function */
7311 #define CMDBUILTIN 2 /* command is a shell builtin */
7313 /* action to find_command() */
7314 #define DO_ERR 0x01 /* prints errors */
7315 #define DO_ABS 0x02 /* checks absolute paths */
7316 #define DO_NOFUNC 0x04 /* don't return shell functions, for command */
7317 #define DO_ALTPATH 0x08 /* using alternate path */
7318 #define DO_ALTBLTIN 0x20 /* %builtin in alt. path */
7320 static void find_command(char *, struct cmdentry *, int, const char *);
7323 /* ============ Hashing commands */
7326 * When commands are first encountered, they are entered in a hash table.
7327 * This ensures that a full path search will not have to be done for them
7328 * on each invocation.
7330 * We should investigate converting to a linear search, even though that
7331 * would make the command name "hash" a misnomer.
7335 struct tblentry *next; /* next entry in hash chain */
7336 union param param; /* definition of builtin function */
7337 smallint cmdtype; /* CMDxxx */
7338 char rehash; /* if set, cd done since entry created */
7339 char cmdname[1]; /* name of command */
7342 static struct tblentry **cmdtable;
7343 #define INIT_G_cmdtable() do { \
7344 cmdtable = xzalloc(CMDTABLESIZE * sizeof(cmdtable[0])); \
7347 static int builtinloc = -1; /* index in path of %builtin, or -1 */
7351 tryexec(IF_FEATURE_SH_STANDALONE(int applet_no,) char *cmd, char **argv, char **envp)
7355 #if ENABLE_FEATURE_SH_STANDALONE
7356 if (applet_no >= 0) {
7357 if (APPLET_IS_NOEXEC(applet_no)) {
7361 run_applet_no_and_exit(applet_no, argv);
7363 /* re-exec ourselves with the new arguments */
7364 execve(bb_busybox_exec_path, argv, envp);
7365 /* If they called chroot or otherwise made the binary no longer
7366 * executable, fall through */
7373 execve(cmd, argv, envp);
7374 } while (errno == EINTR);
7376 execve(cmd, argv, envp);
7382 if (errno == ENOEXEC) {
7386 for (ap = argv; *ap; ap++)
7388 ap = new = ckmalloc((ap - argv + 2) * sizeof(ap[0]));
7390 ap[0] = cmd = (char *)DEFAULT_SHELL;
7393 while ((*ap++ = *argv++) != NULL)
7402 * Exec a program. Never returns. If you change this routine, you may
7403 * have to change the find_command routine as well.
7405 static void shellexec(char **, const char *, int) NORETURN;
7407 shellexec(char **argv, const char *path, int idx)
7413 #if ENABLE_FEATURE_SH_STANDALONE
7417 clearredir(/*drop:*/ 1);
7418 envp = listvars(VEXPORT, VUNSET, /*end:*/ NULL);
7419 if (strchr(argv[0], '/') != NULL
7420 #if ENABLE_FEATURE_SH_STANDALONE
7421 || (applet_no = find_applet_by_name(argv[0])) >= 0
7424 tryexec(IF_FEATURE_SH_STANDALONE(applet_no,) argv[0], argv, envp);
7428 while ((cmdname = path_advance(&path, argv[0])) != NULL) {
7429 if (--idx < 0 && pathopt == NULL) {
7430 tryexec(IF_FEATURE_SH_STANDALONE(-1,) cmdname, argv, envp);
7431 if (errno != ENOENT && errno != ENOTDIR)
7438 /* Map to POSIX errors */
7450 exitstatus = exerrno;
7451 TRACE(("shellexec failed for %s, errno %d, suppress_int %d\n",
7452 argv[0], e, suppress_int));
7453 ash_msg_and_raise(EXEXEC, "%s: %s", argv[0], errmsg(e, "not found"));
7458 printentry(struct tblentry *cmdp)
7464 idx = cmdp->param.index;
7467 name = path_advance(&path, cmdp->cmdname);
7469 } while (--idx >= 0);
7470 out1fmt("%s%s\n", name, (cmdp->rehash ? "*" : nullstr));
7474 * Clear out command entries. The argument specifies the first entry in
7475 * PATH which has changed.
7478 clearcmdentry(int firstchange)
7480 struct tblentry **tblp;
7481 struct tblentry **pp;
7482 struct tblentry *cmdp;
7485 for (tblp = cmdtable; tblp < &cmdtable[CMDTABLESIZE]; tblp++) {
7487 while ((cmdp = *pp) != NULL) {
7488 if ((cmdp->cmdtype == CMDNORMAL &&
7489 cmdp->param.index >= firstchange)
7490 || (cmdp->cmdtype == CMDBUILTIN &&
7491 builtinloc >= firstchange)
7504 * Locate a command in the command hash table. If "add" is nonzero,
7505 * add the command to the table if it is not already present. The
7506 * variable "lastcmdentry" is set to point to the address of the link
7507 * pointing to the entry, so that delete_cmd_entry can delete the
7510 * Interrupts must be off if called with add != 0.
7512 static struct tblentry **lastcmdentry;
7514 static struct tblentry *
7515 cmdlookup(const char *name, int add)
7517 unsigned int hashval;
7519 struct tblentry *cmdp;
7520 struct tblentry **pp;
7523 hashval = (unsigned char)*p << 4;
7525 hashval += (unsigned char)*p++;
7527 pp = &cmdtable[hashval % CMDTABLESIZE];
7528 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7529 if (strcmp(cmdp->cmdname, name) == 0)
7533 if (add && cmdp == NULL) {
7534 cmdp = *pp = ckzalloc(sizeof(struct tblentry)
7536 /* + 1 - already done because
7537 * tblentry::cmdname is char[1] */);
7538 /*cmdp->next = NULL; - ckzalloc did it */
7539 cmdp->cmdtype = CMDUNKNOWN;
7540 strcpy(cmdp->cmdname, name);
7547 * Delete the command entry returned on the last lookup.
7550 delete_cmd_entry(void)
7552 struct tblentry *cmdp;
7555 cmdp = *lastcmdentry;
7556 *lastcmdentry = cmdp->next;
7557 if (cmdp->cmdtype == CMDFUNCTION)
7558 freefunc(cmdp->param.func);
7564 * Add a new command entry, replacing any existing command entry for
7565 * the same name - except special builtins.
7568 addcmdentry(char *name, struct cmdentry *entry)
7570 struct tblentry *cmdp;
7572 cmdp = cmdlookup(name, 1);
7573 if (cmdp->cmdtype == CMDFUNCTION) {
7574 freefunc(cmdp->param.func);
7576 cmdp->cmdtype = entry->cmdtype;
7577 cmdp->param = entry->u;
7581 static int FAST_FUNC
7582 hashcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
7584 struct tblentry **pp;
7585 struct tblentry *cmdp;
7587 struct cmdentry entry;
7590 if (nextopt("r") != '\0') {
7595 if (*argptr == NULL) {
7596 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
7597 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7598 if (cmdp->cmdtype == CMDNORMAL)
7606 while ((name = *argptr) != NULL) {
7607 cmdp = cmdlookup(name, 0);
7609 && (cmdp->cmdtype == CMDNORMAL
7610 || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))
7614 find_command(name, &entry, DO_ERR, pathval());
7615 if (entry.cmdtype == CMDUNKNOWN)
7623 * Called when a cd is done. Marks all commands so the next time they
7624 * are executed they will be rehashed.
7629 struct tblentry **pp;
7630 struct tblentry *cmdp;
7632 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
7633 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7634 if (cmdp->cmdtype == CMDNORMAL
7635 || (cmdp->cmdtype == CMDBUILTIN
7636 && !IS_BUILTIN_REGULAR(cmdp->param.cmd)
7646 * Fix command hash table when PATH changed.
7647 * Called before PATH is changed. The argument is the new value of PATH;
7648 * pathval() still returns the old value at this point.
7649 * Called with interrupts off.
7651 static void FAST_FUNC
7652 changepath(const char *new)
7660 firstchange = 9999; /* assume no change */
7666 if ((*old == '\0' && *new == ':')
7667 || (*old == ':' && *new == '\0')
7671 old = new; /* ignore subsequent differences */
7675 if (*new == '%' && idx_bltin < 0 && prefix(new + 1, "builtin"))
7682 if (builtinloc < 0 && idx_bltin >= 0)
7683 builtinloc = idx_bltin; /* zap builtins */
7684 if (builtinloc >= 0 && idx_bltin < 0)
7686 clearcmdentry(firstchange);
7687 builtinloc = idx_bltin;
7702 #define TENDBQUOTE 12
7719 typedef smallint token_id_t;
7721 /* first char is indicating which tokens mark the end of a list */
7722 static const char *const tokname_array[] = {
7736 #define KWDOFFSET 13
7737 /* the following are keywords */
7756 /* Wrapper around strcmp for qsort/bsearch/... */
7758 pstrcmp(const void *a, const void *b)
7760 return strcmp((char*) a, (*(char**) b) + 1);
7763 static const char *const *
7764 findkwd(const char *s)
7766 return bsearch(s, tokname_array + KWDOFFSET,
7767 ARRAY_SIZE(tokname_array) - KWDOFFSET,
7768 sizeof(tokname_array[0]), pstrcmp);
7772 * Locate and print what a word is...
7775 describe_command(char *command, int describe_command_verbose)
7777 struct cmdentry entry;
7778 struct tblentry *cmdp;
7779 #if ENABLE_ASH_ALIAS
7780 const struct alias *ap;
7782 const char *path = pathval();
7784 if (describe_command_verbose) {
7788 /* First look at the keywords */
7789 if (findkwd(command)) {
7790 out1str(describe_command_verbose ? " is a shell keyword" : command);
7794 #if ENABLE_ASH_ALIAS
7795 /* Then look at the aliases */
7796 ap = lookupalias(command, 0);
7798 if (!describe_command_verbose) {
7803 out1fmt(" is an alias for %s", ap->val);
7807 /* Then check if it is a tracked alias */
7808 cmdp = cmdlookup(command, 0);
7810 entry.cmdtype = cmdp->cmdtype;
7811 entry.u = cmdp->param;
7813 /* Finally use brute force */
7814 find_command(command, &entry, DO_ABS, path);
7817 switch (entry.cmdtype) {
7819 int j = entry.u.index;
7825 p = path_advance(&path, command);
7829 if (describe_command_verbose) {
7831 (cmdp ? " a tracked alias for" : nullstr), p
7840 if (describe_command_verbose) {
7841 out1str(" is a shell function");
7848 if (describe_command_verbose) {
7849 out1fmt(" is a %sshell builtin",
7850 IS_BUILTIN_SPECIAL(entry.u.cmd) ?
7851 "special " : nullstr
7859 if (describe_command_verbose) {
7860 out1str(": not found\n");
7869 static int FAST_FUNC
7870 typecmd(int argc UNUSED_PARAM, char **argv)
7876 /* type -p ... ? (we don't bother checking for 'p') */
7877 if (argv[1] && argv[1][0] == '-') {
7882 err |= describe_command(argv[i++], verbose);
7887 #if ENABLE_ASH_CMDCMD
7888 static int FAST_FUNC
7889 commandcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
7897 while ((c = nextopt("pvV")) != '\0')
7899 verify |= VERIFY_VERBOSE;
7901 verify |= VERIFY_BRIEF;
7906 /* Mimic bash: just "command -v" doesn't complain, it's a nop */
7907 if (verify && (*argptr != NULL)) {
7908 return describe_command(*argptr, verify - VERIFY_BRIEF);
7916 /* ============ eval.c */
7918 static int funcblocksize; /* size of structures in function */
7919 static int funcstringsize; /* size of strings in node */
7920 static void *funcblock; /* block to allocate function from */
7921 static char *funcstring; /* block to allocate strings from */
7923 /* flags in argument to evaltree */
7924 #define EV_EXIT 01 /* exit after evaluating tree */
7925 #define EV_TESTED 02 /* exit status is checked; ignore -e flag */
7926 #define EV_BACKCMD 04 /* command executing within back quotes */
7928 static const uint8_t nodesize[N_NUMBER] = {
7929 [NCMD ] = SHELL_ALIGN(sizeof(struct ncmd)),
7930 [NPIPE ] = SHELL_ALIGN(sizeof(struct npipe)),
7931 [NREDIR ] = SHELL_ALIGN(sizeof(struct nredir)),
7932 [NBACKGND ] = SHELL_ALIGN(sizeof(struct nredir)),
7933 [NSUBSHELL] = SHELL_ALIGN(sizeof(struct nredir)),
7934 [NAND ] = SHELL_ALIGN(sizeof(struct nbinary)),
7935 [NOR ] = SHELL_ALIGN(sizeof(struct nbinary)),
7936 [NSEMI ] = SHELL_ALIGN(sizeof(struct nbinary)),
7937 [NIF ] = SHELL_ALIGN(sizeof(struct nif)),
7938 [NWHILE ] = SHELL_ALIGN(sizeof(struct nbinary)),
7939 [NUNTIL ] = SHELL_ALIGN(sizeof(struct nbinary)),
7940 [NFOR ] = SHELL_ALIGN(sizeof(struct nfor)),
7941 [NCASE ] = SHELL_ALIGN(sizeof(struct ncase)),
7942 [NCLIST ] = SHELL_ALIGN(sizeof(struct nclist)),
7943 [NDEFUN ] = SHELL_ALIGN(sizeof(struct narg)),
7944 [NARG ] = SHELL_ALIGN(sizeof(struct narg)),
7945 [NTO ] = SHELL_ALIGN(sizeof(struct nfile)),
7946 #if ENABLE_ASH_BASH_COMPAT
7947 [NTO2 ] = SHELL_ALIGN(sizeof(struct nfile)),
7949 [NCLOBBER ] = SHELL_ALIGN(sizeof(struct nfile)),
7950 [NFROM ] = SHELL_ALIGN(sizeof(struct nfile)),
7951 [NFROMTO ] = SHELL_ALIGN(sizeof(struct nfile)),
7952 [NAPPEND ] = SHELL_ALIGN(sizeof(struct nfile)),
7953 [NTOFD ] = SHELL_ALIGN(sizeof(struct ndup)),
7954 [NFROMFD ] = SHELL_ALIGN(sizeof(struct ndup)),
7955 [NHERE ] = SHELL_ALIGN(sizeof(struct nhere)),
7956 [NXHERE ] = SHELL_ALIGN(sizeof(struct nhere)),
7957 [NNOT ] = SHELL_ALIGN(sizeof(struct nnot)),
7960 static void calcsize(union node *n);
7963 sizenodelist(struct nodelist *lp)
7966 funcblocksize += SHELL_ALIGN(sizeof(struct nodelist));
7973 calcsize(union node *n)
7977 funcblocksize += nodesize[n->type];
7980 calcsize(n->ncmd.redirect);
7981 calcsize(n->ncmd.args);
7982 calcsize(n->ncmd.assign);
7985 sizenodelist(n->npipe.cmdlist);
7990 calcsize(n->nredir.redirect);
7991 calcsize(n->nredir.n);
7998 calcsize(n->nbinary.ch2);
7999 calcsize(n->nbinary.ch1);
8002 calcsize(n->nif.elsepart);
8003 calcsize(n->nif.ifpart);
8004 calcsize(n->nif.test);
8007 funcstringsize += strlen(n->nfor.var) + 1;
8008 calcsize(n->nfor.body);
8009 calcsize(n->nfor.args);
8012 calcsize(n->ncase.cases);
8013 calcsize(n->ncase.expr);
8016 calcsize(n->nclist.body);
8017 calcsize(n->nclist.pattern);
8018 calcsize(n->nclist.next);
8022 sizenodelist(n->narg.backquote);
8023 funcstringsize += strlen(n->narg.text) + 1;
8024 calcsize(n->narg.next);
8027 #if ENABLE_ASH_BASH_COMPAT
8034 calcsize(n->nfile.fname);
8035 calcsize(n->nfile.next);
8039 calcsize(n->ndup.vname);
8040 calcsize(n->ndup.next);
8044 calcsize(n->nhere.doc);
8045 calcsize(n->nhere.next);
8048 calcsize(n->nnot.com);
8054 nodeckstrdup(char *s)
8056 char *rtn = funcstring;
8058 strcpy(funcstring, s);
8059 funcstring += strlen(s) + 1;
8063 static union node *copynode(union node *);
8065 static struct nodelist *
8066 copynodelist(struct nodelist *lp)
8068 struct nodelist *start;
8069 struct nodelist **lpp;
8074 funcblock = (char *) funcblock + SHELL_ALIGN(sizeof(struct nodelist));
8075 (*lpp)->n = copynode(lp->n);
8077 lpp = &(*lpp)->next;
8084 copynode(union node *n)
8091 funcblock = (char *) funcblock + nodesize[n->type];
8095 new->ncmd.redirect = copynode(n->ncmd.redirect);
8096 new->ncmd.args = copynode(n->ncmd.args);
8097 new->ncmd.assign = copynode(n->ncmd.assign);
8100 new->npipe.cmdlist = copynodelist(n->npipe.cmdlist);
8101 new->npipe.pipe_backgnd = n->npipe.pipe_backgnd;
8106 new->nredir.redirect = copynode(n->nredir.redirect);
8107 new->nredir.n = copynode(n->nredir.n);
8114 new->nbinary.ch2 = copynode(n->nbinary.ch2);
8115 new->nbinary.ch1 = copynode(n->nbinary.ch1);
8118 new->nif.elsepart = copynode(n->nif.elsepart);
8119 new->nif.ifpart = copynode(n->nif.ifpart);
8120 new->nif.test = copynode(n->nif.test);
8123 new->nfor.var = nodeckstrdup(n->nfor.var);
8124 new->nfor.body = copynode(n->nfor.body);
8125 new->nfor.args = copynode(n->nfor.args);
8128 new->ncase.cases = copynode(n->ncase.cases);
8129 new->ncase.expr = copynode(n->ncase.expr);
8132 new->nclist.body = copynode(n->nclist.body);
8133 new->nclist.pattern = copynode(n->nclist.pattern);
8134 new->nclist.next = copynode(n->nclist.next);
8138 new->narg.backquote = copynodelist(n->narg.backquote);
8139 new->narg.text = nodeckstrdup(n->narg.text);
8140 new->narg.next = copynode(n->narg.next);
8143 #if ENABLE_ASH_BASH_COMPAT
8150 new->nfile.fname = copynode(n->nfile.fname);
8151 new->nfile.fd = n->nfile.fd;
8152 new->nfile.next = copynode(n->nfile.next);
8156 new->ndup.vname = copynode(n->ndup.vname);
8157 new->ndup.dupfd = n->ndup.dupfd;
8158 new->ndup.fd = n->ndup.fd;
8159 new->ndup.next = copynode(n->ndup.next);
8163 new->nhere.doc = copynode(n->nhere.doc);
8164 new->nhere.fd = n->nhere.fd;
8165 new->nhere.next = copynode(n->nhere.next);
8168 new->nnot.com = copynode(n->nnot.com);
8171 new->type = n->type;
8176 * Make a copy of a parse tree.
8178 static struct funcnode *
8179 copyfunc(union node *n)
8184 funcblocksize = offsetof(struct funcnode, n);
8187 blocksize = funcblocksize;
8188 f = ckmalloc(blocksize + funcstringsize);
8189 funcblock = (char *) f + offsetof(struct funcnode, n);
8190 funcstring = (char *) f + blocksize;
8197 * Define a shell function.
8200 defun(char *name, union node *func)
8202 struct cmdentry entry;
8205 entry.cmdtype = CMDFUNCTION;
8206 entry.u.func = copyfunc(func);
8207 addcmdentry(name, &entry);
8211 /* Reasons for skipping commands (see comment on breakcmd routine) */
8212 #define SKIPBREAK (1 << 0)
8213 #define SKIPCONT (1 << 1)
8214 #define SKIPFUNC (1 << 2)
8215 #define SKIPFILE (1 << 3)
8216 #define SKIPEVAL (1 << 4)
8217 static smallint evalskip; /* set to SKIPxxx if we are skipping commands */
8218 static int skipcount; /* number of levels to skip */
8219 static int funcnest; /* depth of function calls */
8220 static int loopnest; /* current loop nesting level */
8222 /* Forward decl way out to parsing code - dotrap needs it */
8223 static int evalstring(char *s, int mask);
8225 /* Called to execute a trap.
8226 * Single callsite - at the end of evaltree().
8227 * If we return non-zero, exaltree raises EXEXIT exception.
8229 * Perhaps we should avoid entering new trap handlers
8230 * while we are executing a trap handler. [is it a TODO?]
8239 savestatus = exitstatus;
8243 TRACE(("dotrap entered\n"));
8244 for (sig = 1, g = gotsig; sig < NSIG; sig++, g++) {
8251 /* non-trapped SIGINT is handled separately by raise_interrupt,
8252 * don't upset it by resetting gotsig[SIGINT-1] */
8253 if (sig == SIGINT && !t)
8256 TRACE(("sig %d is active, will run handler '%s'\n", sig, t));
8260 want_exexit = evalstring(t, SKIPEVAL);
8261 exitstatus = savestatus;
8263 TRACE(("dotrap returns %d\n", want_exexit));
8268 TRACE(("dotrap returns 0\n"));
8272 /* forward declarations - evaluation is fairly recursive business... */
8273 static void evalloop(union node *, int);
8274 static void evalfor(union node *, int);
8275 static void evalcase(union node *, int);
8276 static void evalsubshell(union node *, int);
8277 static void expredir(union node *);
8278 static void evalpipe(union node *, int);
8279 static void evalcommand(union node *, int);
8280 static int evalbltin(const struct builtincmd *, int, char **);
8281 static void prehash(union node *);
8284 * Evaluate a parse tree. The value is left in the global variable
8288 evaltree(union node *n, int flags)
8290 struct jmploc *volatile savehandler = exception_handler;
8291 struct jmploc jmploc;
8293 void (*evalfn)(union node *, int);
8297 SAVE_INT(int_level);
8300 TRACE(("evaltree(NULL) called\n"));
8303 TRACE(("evaltree(%p: %d, %d) called\n", n, n->type, flags));
8305 exception_handler = &jmploc;
8307 int err = setjmp(jmploc.loc);
8309 /* if it was a signal, check for trap handlers */
8310 if (exception_type == EXSIG) {
8311 TRACE(("exception %d (EXSIG) in evaltree, err=%d\n",
8312 exception_type, err));
8315 /* continue on the way out */
8316 TRACE(("exception %d in evaltree, propagating err=%d\n",
8317 exception_type, err));
8318 exception_handler = savehandler;
8319 longjmp(exception_handler->loc, err);
8326 out1fmt("Node type = %d\n", n->type);
8331 evaltree(n->nnot.com, EV_TESTED);
8332 status = !exitstatus;
8335 expredir(n->nredir.redirect);
8336 status = redirectsafe(n->nredir.redirect, REDIR_PUSH);
8338 evaltree(n->nredir.n, flags & EV_TESTED);
8339 status = exitstatus;
8341 popredir(/*drop:*/ 0, /*restore:*/ 0 /* not sure */);
8344 evalfn = evalcommand;
8346 if (eflag && !(flags & EV_TESTED))
8358 evalfn = evalsubshell;
8371 #error NAND + 1 != NOR
8373 #if NOR + 1 != NSEMI
8374 #error NOR + 1 != NSEMI
8376 unsigned is_or = n->type - NAND;
8379 (flags | ((is_or >> 1) - 1)) & EV_TESTED
8381 if (!exitstatus == is_or)
8394 evaltree(n->nif.test, EV_TESTED);
8397 if (exitstatus == 0) {
8401 if (n->nif.elsepart) {
8402 n = n->nif.elsepart;
8407 defun(n->narg.text, n->narg.next);
8411 exitstatus = status;
8416 exception_handler = savehandler;
8418 if (checkexit & exitstatus)
8419 evalskip |= SKIPEVAL;
8420 else if (pending_sig && dotrap())
8423 if (flags & EV_EXIT) {
8425 raise_exception(EXEXIT);
8428 RESTORE_INT(int_level);
8429 TRACE(("leaving evaltree (no interrupts)\n"));
8432 #if !defined(__alpha__) || (defined(__GNUC__) && __GNUC__ >= 3)
8435 void evaltreenr(union node *, int) __attribute__ ((alias("evaltree"),__noreturn__));
8438 evalloop(union node *n, int flags)
8448 evaltree(n->nbinary.ch1, EV_TESTED);
8451 if (evalskip == SKIPCONT && --skipcount <= 0) {
8455 if (evalskip == SKIPBREAK && --skipcount <= 0)
8460 if (n->type != NWHILE)
8464 evaltree(n->nbinary.ch2, flags);
8465 status = exitstatus;
8470 exitstatus = status;
8474 evalfor(union node *n, int flags)
8476 struct arglist arglist;
8479 struct stackmark smark;
8481 setstackmark(&smark);
8482 arglist.list = NULL;
8483 arglist.lastp = &arglist.list;
8484 for (argp = n->nfor.args; argp; argp = argp->narg.next) {
8485 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE | EXP_RECORD);
8490 *arglist.lastp = NULL;
8495 for (sp = arglist.list; sp; sp = sp->next) {
8496 setvar(n->nfor.var, sp->text, 0);
8497 evaltree(n->nfor.body, flags);
8499 if (evalskip == SKIPCONT && --skipcount <= 0) {
8503 if (evalskip == SKIPBREAK && --skipcount <= 0)
8510 popstackmark(&smark);
8514 evalcase(union node *n, int flags)
8518 struct arglist arglist;
8519 struct stackmark smark;
8521 setstackmark(&smark);
8522 arglist.list = NULL;
8523 arglist.lastp = &arglist.list;
8524 expandarg(n->ncase.expr, &arglist, EXP_TILDE);
8526 for (cp = n->ncase.cases; cp && evalskip == 0; cp = cp->nclist.next) {
8527 for (patp = cp->nclist.pattern; patp; patp = patp->narg.next) {
8528 if (casematch(patp, arglist.list->text)) {
8529 if (evalskip == 0) {
8530 evaltree(cp->nclist.body, flags);
8537 popstackmark(&smark);
8541 * Kick off a subshell to evaluate a tree.
8544 evalsubshell(union node *n, int flags)
8547 int backgnd = (n->type == NBACKGND);
8550 expredir(n->nredir.redirect);
8551 if (!backgnd && (flags & EV_EXIT) && !may_have_traps)
8554 jp = makejob(/*n,*/ 1);
8555 if (forkshell(jp, n, backgnd) == 0) {
8560 flags &= ~EV_TESTED;
8562 redirect(n->nredir.redirect, 0);
8563 evaltreenr(n->nredir.n, flags);
8568 status = waitforjob(jp);
8569 exitstatus = status;
8574 * Compute the names of the files in a redirection list.
8576 static void fixredir(union node *, const char *, int);
8578 expredir(union node *n)
8582 for (redir = n; redir; redir = redir->nfile.next) {
8586 fn.lastp = &fn.list;
8587 switch (redir->type) {
8591 #if ENABLE_ASH_BASH_COMPAT
8596 expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR);
8597 #if ENABLE_ASH_BASH_COMPAT
8600 redir->nfile.expfname = fn.list->text;
8603 case NTOFD: /* >& */
8604 if (redir->ndup.vname) {
8605 expandarg(redir->ndup.vname, &fn, EXP_FULL | EXP_TILDE);
8606 if (fn.list == NULL)
8607 ash_msg_and_raise_error("redir error");
8608 #if ENABLE_ASH_BASH_COMPAT
8609 //FIXME: we used expandarg with different args!
8610 if (!isdigit_str9(fn.list->text)) {
8611 /* >&file, not >&fd */
8612 if (redir->nfile.fd != 1) /* 123>&file - BAD */
8613 ash_msg_and_raise_error("redir error");
8615 goto store_expfname;
8618 fixredir(redir, fn.list->text, 1);
8626 * Evaluate a pipeline. All the processes in the pipeline are children
8627 * of the process creating the pipeline. (This differs from some versions
8628 * of the shell, which make the last process in a pipeline the parent
8632 evalpipe(union node *n, int flags)
8635 struct nodelist *lp;
8640 TRACE(("evalpipe(0x%lx) called\n", (long)n));
8642 for (lp = n->npipe.cmdlist; lp; lp = lp->next)
8646 jp = makejob(/*n,*/ pipelen);
8648 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
8652 if (pipe(pip) < 0) {
8654 ash_msg_and_raise_error("pipe call failed");
8657 if (forkshell(jp, lp->n, n->npipe.pipe_backgnd) == 0) {
8670 evaltreenr(lp->n, flags);
8676 /* Don't want to trigger debugging */
8680 if (n->npipe.pipe_backgnd == 0) {
8681 exitstatus = waitforjob(jp);
8682 TRACE(("evalpipe: job done exit status %d\n", exitstatus));
8688 * Controls whether the shell is interactive or not.
8691 setinteractive(int on)
8693 static smallint is_interactive;
8695 if (++on == is_interactive)
8697 is_interactive = on;
8701 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
8702 if (is_interactive > 1) {
8703 /* Looks like they want an interactive shell */
8704 static smallint did_banner;
8707 /* note: ash and hush share this string */
8708 out1fmt("\n\n%s %s\n"
8709 "Enter 'help' for a list of built-in commands."
8712 "built-in shell (ash)"
8726 setinteractive(iflag);
8728 #if ENABLE_FEATURE_EDITING_VI
8730 line_input_state->flags |= VI_MODE;
8732 line_input_state->flags &= ~VI_MODE;
8734 viflag = 0; /* forcibly keep the option off */
8738 static struct localvar *localvars;
8741 * Called after a function returns.
8742 * Interrupts must be off.
8747 struct localvar *lvp;
8750 while ((lvp = localvars) != NULL) {
8751 localvars = lvp->next;
8753 TRACE(("poplocalvar %s\n", vp ? vp->text : "-"));
8754 if (vp == NULL) { /* $- saved */
8755 memcpy(optlist, lvp->text, sizeof(optlist));
8756 free((char*)lvp->text);
8758 } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) {
8759 unsetvar(vp->var_text);
8762 vp->var_func(var_end(lvp->text));
8763 if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
8764 free((char*)vp->var_text);
8765 vp->flags = lvp->flags;
8766 vp->var_text = lvp->text;
8773 evalfun(struct funcnode *func, int argc, char **argv, int flags)
8775 volatile struct shparam saveparam;
8776 struct localvar *volatile savelocalvars;
8777 struct jmploc *volatile savehandler;
8778 struct jmploc jmploc;
8781 saveparam = shellparam;
8782 savelocalvars = localvars;
8783 e = setjmp(jmploc.loc);
8788 savehandler = exception_handler;
8789 exception_handler = &jmploc;
8791 shellparam.malloced = 0;
8795 shellparam.nparam = argc - 1;
8796 shellparam.p = argv + 1;
8797 #if ENABLE_ASH_GETOPTS
8798 shellparam.optind = 1;
8799 shellparam.optoff = -1;
8801 evaltree(&func->n, flags & EV_TESTED);
8807 localvars = savelocalvars;
8808 freeparam(&shellparam);
8809 shellparam = saveparam;
8810 exception_handler = savehandler;
8812 evalskip &= ~SKIPFUNC;
8816 #if ENABLE_ASH_CMDCMD
8818 parse_command_args(char **argv, const char **path)
8831 if (c == '-' && !*cp) {
8838 *path = bb_default_path;
8841 /* run 'typecmd' for other options */
8852 * Make a variable a local variable. When a variable is made local, it's
8853 * value and flags are saved in a localvar structure. The saved values
8854 * will be restored when the shell function returns. We handle the name
8855 * "-" as a special case.
8860 struct localvar *lvp;
8865 lvp = ckzalloc(sizeof(struct localvar));
8866 if (LONE_DASH(name)) {
8868 p = ckmalloc(sizeof(optlist));
8869 lvp->text = memcpy(p, optlist, sizeof(optlist));
8874 vpp = hashvar(name);
8875 vp = *findvar(vpp, name);
8876 eq = strchr(name, '=');
8879 setvareq(name, VSTRFIXED);
8881 setvar(name, NULL, VSTRFIXED);
8882 vp = *vpp; /* the new variable */
8883 lvp->flags = VUNSET;
8885 lvp->text = vp->var_text;
8886 lvp->flags = vp->flags;
8887 vp->flags |= VSTRFIXED|VTEXTFIXED;
8893 lvp->next = localvars;
8899 * The "local" command.
8901 static int FAST_FUNC
8902 localcmd(int argc UNUSED_PARAM, char **argv)
8907 while ((name = *argv++) != NULL) {
8913 static int FAST_FUNC
8914 falsecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
8919 static int FAST_FUNC
8920 truecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
8925 static int FAST_FUNC
8926 execcmd(int argc UNUSED_PARAM, char **argv)
8929 iflag = 0; /* exit on error */
8932 shellexec(argv + 1, pathval(), 0);
8938 * The return command.
8940 static int FAST_FUNC
8941 returncmd(int argc UNUSED_PARAM, char **argv)
8944 * If called outside a function, do what ksh does;
8945 * skip the rest of the file.
8947 evalskip = funcnest ? SKIPFUNC : SKIPFILE;
8948 return argv[1] ? number(argv[1]) : exitstatus;
8951 /* Forward declarations for builtintab[] */
8952 static int breakcmd(int, char **) FAST_FUNC;
8953 static int dotcmd(int, char **) FAST_FUNC;
8954 static int evalcmd(int, char **) FAST_FUNC;
8955 static int exitcmd(int, char **) FAST_FUNC;
8956 static int exportcmd(int, char **) FAST_FUNC;
8957 #if ENABLE_ASH_GETOPTS
8958 static int getoptscmd(int, char **) FAST_FUNC;
8960 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
8961 static int helpcmd(int, char **) FAST_FUNC;
8963 #if ENABLE_SH_MATH_SUPPORT
8964 static int letcmd(int, char **) FAST_FUNC;
8966 static int readcmd(int, char **) FAST_FUNC;
8967 static int setcmd(int, char **) FAST_FUNC;
8968 static int shiftcmd(int, char **) FAST_FUNC;
8969 static int timescmd(int, char **) FAST_FUNC;
8970 static int trapcmd(int, char **) FAST_FUNC;
8971 static int umaskcmd(int, char **) FAST_FUNC;
8972 static int unsetcmd(int, char **) FAST_FUNC;
8973 static int ulimitcmd(int, char **) FAST_FUNC;
8975 #define BUILTIN_NOSPEC "0"
8976 #define BUILTIN_SPECIAL "1"
8977 #define BUILTIN_REGULAR "2"
8978 #define BUILTIN_SPEC_REG "3"
8979 #define BUILTIN_ASSIGN "4"
8980 #define BUILTIN_SPEC_ASSG "5"
8981 #define BUILTIN_REG_ASSG "6"
8982 #define BUILTIN_SPEC_REG_ASSG "7"
8984 /* Stubs for calling non-FAST_FUNC's */
8985 #if ENABLE_ASH_BUILTIN_ECHO
8986 static int FAST_FUNC echocmd(int argc, char **argv) { return echo_main(argc, argv); }
8988 #if ENABLE_ASH_BUILTIN_PRINTF
8989 static int FAST_FUNC printfcmd(int argc, char **argv) { return printf_main(argc, argv); }
8991 #if ENABLE_ASH_BUILTIN_TEST
8992 static int FAST_FUNC testcmd(int argc, char **argv) { return test_main(argc, argv); }
8995 /* Keep these in proper order since it is searched via bsearch() */
8996 static const struct builtincmd builtintab[] = {
8997 { BUILTIN_SPEC_REG "." , dotcmd },
8998 { BUILTIN_SPEC_REG ":" , truecmd },
8999 #if ENABLE_ASH_BUILTIN_TEST
9000 { BUILTIN_REGULAR "[" , testcmd },
9001 #if ENABLE_ASH_BASH_COMPAT
9002 { BUILTIN_REGULAR "[[" , testcmd },
9005 #if ENABLE_ASH_ALIAS
9006 { BUILTIN_REG_ASSG "alias" , aliascmd },
9009 { BUILTIN_REGULAR "bg" , fg_bgcmd },
9011 { BUILTIN_SPEC_REG "break" , breakcmd },
9012 { BUILTIN_REGULAR "cd" , cdcmd },
9013 { BUILTIN_NOSPEC "chdir" , cdcmd },
9014 #if ENABLE_ASH_CMDCMD
9015 { BUILTIN_REGULAR "command" , commandcmd },
9017 { BUILTIN_SPEC_REG "continue", breakcmd },
9018 #if ENABLE_ASH_BUILTIN_ECHO
9019 { BUILTIN_REGULAR "echo" , echocmd },
9021 { BUILTIN_SPEC_REG "eval" , evalcmd },
9022 { BUILTIN_SPEC_REG "exec" , execcmd },
9023 { BUILTIN_SPEC_REG "exit" , exitcmd },
9024 { BUILTIN_SPEC_REG_ASSG "export" , exportcmd },
9025 { BUILTIN_REGULAR "false" , falsecmd },
9027 { BUILTIN_REGULAR "fg" , fg_bgcmd },
9029 #if ENABLE_ASH_GETOPTS
9030 { BUILTIN_REGULAR "getopts" , getoptscmd },
9032 { BUILTIN_NOSPEC "hash" , hashcmd },
9033 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
9034 { BUILTIN_NOSPEC "help" , helpcmd },
9037 { BUILTIN_REGULAR "jobs" , jobscmd },
9038 { BUILTIN_REGULAR "kill" , killcmd },
9040 #if ENABLE_SH_MATH_SUPPORT
9041 { BUILTIN_NOSPEC "let" , letcmd },
9043 { BUILTIN_ASSIGN "local" , localcmd },
9044 #if ENABLE_ASH_BUILTIN_PRINTF
9045 { BUILTIN_REGULAR "printf" , printfcmd },
9047 { BUILTIN_NOSPEC "pwd" , pwdcmd },
9048 { BUILTIN_REGULAR "read" , readcmd },
9049 { BUILTIN_SPEC_REG_ASSG "readonly", exportcmd },
9050 { BUILTIN_SPEC_REG "return" , returncmd },
9051 { BUILTIN_SPEC_REG "set" , setcmd },
9052 { BUILTIN_SPEC_REG "shift" , shiftcmd },
9053 #if ENABLE_ASH_BASH_COMPAT
9054 { BUILTIN_SPEC_REG "source" , dotcmd },
9056 #if ENABLE_ASH_BUILTIN_TEST
9057 { BUILTIN_REGULAR "test" , testcmd },
9059 { BUILTIN_SPEC_REG "times" , timescmd },
9060 { BUILTIN_SPEC_REG "trap" , trapcmd },
9061 { BUILTIN_REGULAR "true" , truecmd },
9062 { BUILTIN_NOSPEC "type" , typecmd },
9063 { BUILTIN_NOSPEC "ulimit" , ulimitcmd },
9064 { BUILTIN_REGULAR "umask" , umaskcmd },
9065 #if ENABLE_ASH_ALIAS
9066 { BUILTIN_REGULAR "unalias" , unaliascmd },
9068 { BUILTIN_SPEC_REG "unset" , unsetcmd },
9069 { BUILTIN_REGULAR "wait" , waitcmd },
9072 /* Should match the above table! */
9073 #define COMMANDCMD (builtintab + \
9075 1 * ENABLE_ASH_BUILTIN_TEST + \
9076 1 * ENABLE_ASH_BUILTIN_TEST * ENABLE_ASH_BASH_COMPAT + \
9077 1 * ENABLE_ASH_ALIAS + \
9078 1 * ENABLE_ASH_JOB_CONTROL + \
9080 #define EXECCMD (builtintab + \
9082 1 * ENABLE_ASH_BUILTIN_TEST + \
9083 1 * ENABLE_ASH_BUILTIN_TEST * ENABLE_ASH_BASH_COMPAT + \
9084 1 * ENABLE_ASH_ALIAS + \
9085 1 * ENABLE_ASH_JOB_CONTROL + \
9087 1 * ENABLE_ASH_CMDCMD + \
9089 ENABLE_ASH_BUILTIN_ECHO + \
9093 * Search the table of builtin commands.
9095 static struct builtincmd *
9096 find_builtin(const char *name)
9098 struct builtincmd *bp;
9101 name, builtintab, ARRAY_SIZE(builtintab), sizeof(builtintab[0]),
9108 * Execute a simple command.
9111 isassignment(const char *p)
9113 const char *q = endofname(p);
9118 static int FAST_FUNC
9119 bltincmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
9121 /* Preserve exitstatus of a previous possible redirection
9122 * as POSIX mandates */
9123 return back_exitstatus;
9126 evalcommand(union node *cmd, int flags)
9128 static const struct builtincmd null_bltin = {
9129 "\0\0", bltincmd /* why three NULs? */
9131 struct stackmark smark;
9133 struct arglist arglist;
9134 struct arglist varlist;
9137 const struct strlist *sp;
9138 struct cmdentry cmdentry;
9145 struct builtincmd *bcmd;
9146 smallint cmd_is_exec;
9147 smallint pseudovarflag = 0;
9149 /* First expand the arguments. */
9150 TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags));
9151 setstackmark(&smark);
9152 back_exitstatus = 0;
9154 cmdentry.cmdtype = CMDBUILTIN;
9155 cmdentry.u.cmd = &null_bltin;
9156 varlist.lastp = &varlist.list;
9157 *varlist.lastp = NULL;
9158 arglist.lastp = &arglist.list;
9159 *arglist.lastp = NULL;
9162 if (cmd->ncmd.args) {
9163 bcmd = find_builtin(cmd->ncmd.args->narg.text);
9164 pseudovarflag = bcmd && IS_BUILTIN_ASSIGN(bcmd);
9167 for (argp = cmd->ncmd.args; argp; argp = argp->narg.next) {
9168 struct strlist **spp;
9170 spp = arglist.lastp;
9171 if (pseudovarflag && isassignment(argp->narg.text))
9172 expandarg(argp, &arglist, EXP_VARTILDE);
9174 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
9176 for (sp = *spp; sp; sp = sp->next)
9180 argv = nargv = stalloc(sizeof(char *) * (argc + 1));
9181 for (sp = arglist.list; sp; sp = sp->next) {
9182 TRACE(("evalcommand arg: %s\n", sp->text));
9183 *nargv++ = sp->text;
9188 if (iflag && funcnest == 0 && argc > 0)
9189 lastarg = nargv[-1];
9192 expredir(cmd->ncmd.redirect);
9193 status = redirectsafe(cmd->ncmd.redirect, REDIR_PUSH | REDIR_SAVEFD2);
9195 path = vpath.var_text;
9196 for (argp = cmd->ncmd.assign; argp; argp = argp->narg.next) {
9197 struct strlist **spp;
9200 spp = varlist.lastp;
9201 expandarg(argp, &varlist, EXP_VARTILDE);
9204 * Modify the command lookup path, if a PATH= assignment
9208 if (varcmp(p, path) == 0)
9212 /* Print the command if xflag is set. */
9215 const char *p = " %s" + 1;
9217 fdprintf(preverrout_fd, p, expandstr(ps4val()));
9219 for (n = 0; n < 2; n++) {
9221 fdprintf(preverrout_fd, p, sp->text);
9227 safe_write(preverrout_fd, "\n", 1);
9233 /* Now locate the command. */
9235 const char *oldpath;
9236 int cmd_flag = DO_ERR;
9241 find_command(argv[0], &cmdentry, cmd_flag, path);
9242 if (cmdentry.cmdtype == CMDUNKNOWN) {
9243 flush_stdout_stderr();
9248 /* implement bltin and command here */
9249 if (cmdentry.cmdtype != CMDBUILTIN)
9252 spclbltin = IS_BUILTIN_SPECIAL(cmdentry.u.cmd);
9253 if (cmdentry.u.cmd == EXECCMD)
9255 #if ENABLE_ASH_CMDCMD
9256 if (cmdentry.u.cmd == COMMANDCMD) {
9258 nargv = parse_command_args(argv, &path);
9261 argc -= nargv - argv;
9263 cmd_flag |= DO_NOFUNC;
9271 /* We have a redirection error. */
9273 raise_exception(EXERROR);
9275 exitstatus = status;
9279 /* Execute the command. */
9280 switch (cmdentry.cmdtype) {
9283 #if ENABLE_FEATURE_SH_NOFORK
9284 /* (1) BUG: if variables are set, we need to fork, or save/restore them
9285 * around run_nofork_applet() call.
9286 * (2) Should this check also be done in forkshell()?
9287 * (perhaps it should, so that "VAR=VAL nofork" at least avoids exec...)
9289 /* find_command() encodes applet_no as (-2 - applet_no) */
9290 int applet_no = (- cmdentry.u.index - 2);
9291 if (applet_no >= 0 && APPLET_IS_NOFORK(applet_no)) {
9292 listsetvar(varlist.list, VEXPORT|VSTACK);
9293 /* run <applet>_main() */
9294 exitstatus = run_nofork_applet(applet_no, argv);
9298 /* Can we avoid forking off? For example, very last command
9299 * in a script or a subshell does not need forking,
9300 * we can just exec it.
9302 if (!(flags & EV_EXIT) || may_have_traps) {
9303 /* No, forking off a child is necessary */
9305 jp = makejob(/*cmd,*/ 1);
9306 if (forkshell(jp, cmd, FORK_FG) != 0) {
9308 exitstatus = waitforjob(jp);
9310 TRACE(("forked child exited with %d\n", exitstatus));
9315 /* fall through to exec'ing external program */
9317 listsetvar(varlist.list, VEXPORT|VSTACK);
9318 shellexec(argv, path, cmdentry.u.index);
9322 cmdenviron = varlist.list;
9324 struct strlist *list = cmdenviron;
9326 if (spclbltin > 0 || argc == 0) {
9328 if (cmd_is_exec && argc > 1)
9331 listsetvar(list, i);
9333 /* Tight loop with builtins only:
9334 * "while kill -0 $child; do true; done"
9335 * will never exit even if $child died, unless we do this
9336 * to reap the zombie and make kill detect that it's gone: */
9337 dowait(DOWAIT_NONBLOCK, NULL);
9339 if (evalbltin(cmdentry.u.cmd, argc, argv)) {
9341 int i = exception_type;
9346 exit_status = 128 + SIGINT;
9348 exit_status = 128 + pending_sig;
9349 exitstatus = exit_status;
9350 if (i == EXINT || spclbltin > 0) {
9352 longjmp(exception_handler->loc, 1);
9359 listsetvar(varlist.list, 0);
9360 /* See above for the rationale */
9361 dowait(DOWAIT_NONBLOCK, NULL);
9362 if (evalfun(cmdentry.u.func, argc, argv, flags))
9369 popredir(/*drop:*/ cmd_is_exec, /*restore:*/ cmd_is_exec);
9371 /* dsl: I think this is intended to be used to support
9372 * '_' in 'vi' command mode during line editing...
9373 * However I implemented that within libedit itself.
9375 setvar("_", lastarg, 0);
9377 popstackmark(&smark);
9381 evalbltin(const struct builtincmd *cmd, int argc, char **argv)
9383 char *volatile savecmdname;
9384 struct jmploc *volatile savehandler;
9385 struct jmploc jmploc;
9388 savecmdname = commandname;
9389 i = setjmp(jmploc.loc);
9392 savehandler = exception_handler;
9393 exception_handler = &jmploc;
9394 commandname = argv[0];
9396 optptr = NULL; /* initialize nextopt */
9397 exitstatus = (*cmd->builtin)(argc, argv);
9398 flush_stdout_stderr();
9400 exitstatus |= ferror(stdout);
9402 commandname = savecmdname;
9403 exception_handler = savehandler;
9409 goodname(const char *p)
9411 return endofname(p)[0] == '\0';
9416 * Search for a command. This is called before we fork so that the
9417 * location of the command will be available in the parent as well as
9418 * the child. The check for "goodname" is an overly conservative
9419 * check that the name will not be subject to expansion.
9422 prehash(union node *n)
9424 struct cmdentry entry;
9426 if (n->type == NCMD && n->ncmd.args && goodname(n->ncmd.args->narg.text))
9427 find_command(n->ncmd.args->narg.text, &entry, 0, pathval());
9431 /* ============ Builtin commands
9433 * Builtin commands whose functions are closely tied to evaluation
9434 * are implemented here.
9438 * Handle break and continue commands. Break, continue, and return are
9439 * all handled by setting the evalskip flag. The evaluation routines
9440 * above all check this flag, and if it is set they start skipping
9441 * commands rather than executing them. The variable skipcount is
9442 * the number of loops to break/continue, or the number of function
9443 * levels to return. (The latter is always 1.) It should probably
9444 * be an error to break out of more loops than exist, but it isn't
9445 * in the standard shell so we don't make it one here.
9447 static int FAST_FUNC
9448 breakcmd(int argc UNUSED_PARAM, char **argv)
9450 int n = argv[1] ? number(argv[1]) : 1;
9453 ash_msg_and_raise_error(msg_illnum, argv[1]);
9457 evalskip = (**argv == 'c') ? SKIPCONT : SKIPBREAK;
9464 /* ============ input.c
9466 * This implements the input routines used by the parser.
9470 INPUT_PUSH_FILE = 1,
9471 INPUT_NOFILE_OK = 2,
9474 static smallint checkkwd;
9475 /* values of checkkwd variable */
9476 #define CHKALIAS 0x1
9481 * Push a string back onto the input at this current parsefile level.
9482 * We handle aliases this way.
9484 #if !ENABLE_ASH_ALIAS
9485 #define pushstring(s, ap) pushstring(s)
9488 pushstring(char *s, struct alias *ap)
9495 if (g_parsefile->strpush) {
9496 sp = ckzalloc(sizeof(*sp));
9497 sp->prev = g_parsefile->strpush;
9499 sp = &(g_parsefile->basestrpush);
9501 g_parsefile->strpush = sp;
9502 sp->prev_string = g_parsefile->next_to_pgetc;
9503 sp->prev_left_in_line = g_parsefile->left_in_line;
9504 #if ENABLE_ASH_ALIAS
9507 ap->flag |= ALIASINUSE;
9511 g_parsefile->next_to_pgetc = s;
9512 g_parsefile->left_in_line = len;
9519 struct strpush *sp = g_parsefile->strpush;
9522 #if ENABLE_ASH_ALIAS
9524 if (g_parsefile->next_to_pgetc[-1] == ' '
9525 || g_parsefile->next_to_pgetc[-1] == '\t'
9527 checkkwd |= CHKALIAS;
9529 if (sp->string != sp->ap->val) {
9532 sp->ap->flag &= ~ALIASINUSE;
9533 if (sp->ap->flag & ALIASDEAD) {
9534 unalias(sp->ap->name);
9538 g_parsefile->next_to_pgetc = sp->prev_string;
9539 g_parsefile->left_in_line = sp->prev_left_in_line;
9540 g_parsefile->strpush = sp->prev;
9541 if (sp != &(g_parsefile->basestrpush))
9546 //FIXME: BASH_COMPAT with "...&" does TWO pungetc():
9547 //it peeks whether it is &>, and then pushes back both chars.
9548 //This function needs to save last *next_to_pgetc to buf[0]
9549 //to make two pungetc() reliable. Currently,
9550 // pgetc (out of buf: does preadfd), pgetc, pungetc, pungetc won't work...
9555 char *buf = g_parsefile->buf;
9557 g_parsefile->next_to_pgetc = buf;
9558 #if ENABLE_FEATURE_EDITING
9560 if (!iflag || g_parsefile->pf_fd != STDIN_FILENO)
9561 nr = nonblock_safe_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1);
9563 #if ENABLE_FEATURE_TAB_COMPLETION
9564 line_input_state->path_lookup = pathval();
9566 nr = read_line_input(cmdedit_prompt, buf, IBUFSIZ, line_input_state);
9568 /* Ctrl+C pressed */
9577 if (nr < 0 && errno == 0) {
9578 /* Ctrl+D pressed */
9583 nr = nonblock_safe_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1);
9587 /* nonblock_safe_read() handles this problem */
9589 if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
9590 int flags = fcntl(0, F_GETFL);
9591 if (flags >= 0 && (flags & O_NONBLOCK)) {
9592 flags &= ~O_NONBLOCK;
9593 if (fcntl(0, F_SETFL, flags) >= 0) {
9594 out2str("sh: turning off NDELAY mode\n");
9605 * Refill the input buffer and return the next input character:
9607 * 1) If a string was pushed back on the input, pop it;
9608 * 2) If an EOF was pushed back (g_parsefile->left_in_line < -BIGNUM)
9609 * or we are reading from a string so we can't refill the buffer,
9611 * 3) If there is more stuff in this buffer, use it else call read to fill it.
9612 * 4) Process input up to the next newline, deleting nul characters.
9614 //#define pgetc_debug(...) bb_error_msg(__VA_ARGS__)
9615 #define pgetc_debug(...) ((void)0)
9622 while (g_parsefile->strpush) {
9623 #if ENABLE_ASH_ALIAS
9624 if (g_parsefile->left_in_line == -1
9625 && g_parsefile->strpush->ap
9626 && g_parsefile->next_to_pgetc[-1] != ' '
9627 && g_parsefile->next_to_pgetc[-1] != '\t'
9629 pgetc_debug("preadbuffer PEOA");
9634 /* try "pgetc" now: */
9635 pgetc_debug("preadbuffer internal pgetc at %d:%p'%s'",
9636 g_parsefile->left_in_line,
9637 g_parsefile->next_to_pgetc,
9638 g_parsefile->next_to_pgetc);
9639 if (--g_parsefile->left_in_line >= 0)
9640 return (unsigned char)(*g_parsefile->next_to_pgetc++);
9642 /* on both branches above g_parsefile->left_in_line < 0.
9643 * "pgetc" needs refilling.
9646 /* -90 is our -BIGNUM. Below we use -99 to mark "EOF on read",
9647 * pungetc() may increment it a few times.
9648 * Assuming it won't increment it to less than -90.
9650 if (g_parsefile->left_in_line < -90 || g_parsefile->buf == NULL) {
9651 pgetc_debug("preadbuffer PEOF1");
9652 /* even in failure keep left_in_line and next_to_pgetc
9653 * in lock step, for correct multi-layer pungetc.
9654 * left_in_line was decremented before preadbuffer(),
9655 * must inc next_to_pgetc: */
9656 g_parsefile->next_to_pgetc++;
9660 more = g_parsefile->left_in_buffer;
9662 flush_stdout_stderr();
9666 /* don't try reading again */
9667 g_parsefile->left_in_line = -99;
9668 pgetc_debug("preadbuffer PEOF2");
9669 g_parsefile->next_to_pgetc++;
9674 /* Find out where's the end of line.
9675 * Set g_parsefile->left_in_line
9676 * and g_parsefile->left_in_buffer acordingly.
9677 * NUL chars are deleted.
9679 q = g_parsefile->next_to_pgetc;
9687 memmove(q, q + 1, more);
9691 g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1;
9697 g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1;
9698 if (g_parsefile->left_in_line < 0)
9703 g_parsefile->left_in_buffer = more;
9708 out2str(g_parsefile->next_to_pgetc);
9712 pgetc_debug("preadbuffer at %d:%p'%s'",
9713 g_parsefile->left_in_line,
9714 g_parsefile->next_to_pgetc,
9715 g_parsefile->next_to_pgetc);
9716 return (unsigned char)*g_parsefile->next_to_pgetc++;
9719 #define pgetc_as_macro() \
9720 (--g_parsefile->left_in_line >= 0 \
9721 ? (unsigned char)*g_parsefile->next_to_pgetc++ \
9728 pgetc_debug("pgetc_fast at %d:%p'%s'",
9729 g_parsefile->left_in_line,
9730 g_parsefile->next_to_pgetc,
9731 g_parsefile->next_to_pgetc);
9732 return pgetc_as_macro();
9735 #if ENABLE_ASH_OPTIMIZE_FOR_SIZE
9736 # define pgetc_fast() pgetc()
9738 # define pgetc_fast() pgetc_as_macro()
9741 #if ENABLE_ASH_ALIAS
9743 pgetc_without_PEOA(void)
9747 pgetc_debug("pgetc_fast at %d:%p'%s'",
9748 g_parsefile->left_in_line,
9749 g_parsefile->next_to_pgetc,
9750 g_parsefile->next_to_pgetc);
9752 } while (c == PEOA);
9756 # define pgetc_without_PEOA() pgetc()
9760 * Read a line from the script.
9763 pfgets(char *line, int len)
9769 while (--nleft > 0) {
9770 c = pgetc_without_PEOA();
9785 * Undo the last call to pgetc. Only one character may be pushed back.
9786 * PEOF may be pushed back.
9791 g_parsefile->left_in_line++;
9792 g_parsefile->next_to_pgetc--;
9793 pgetc_debug("pushed back to %d:%p'%s'",
9794 g_parsefile->left_in_line,
9795 g_parsefile->next_to_pgetc,
9796 g_parsefile->next_to_pgetc);
9800 * To handle the "." command, a stack of input files is used. Pushfile
9801 * adds a new entry to the stack and popfile restores the previous level.
9806 struct parsefile *pf;
9808 pf = ckzalloc(sizeof(*pf));
9809 pf->prev = g_parsefile;
9811 /*pf->strpush = NULL; - ckzalloc did it */
9812 /*pf->basestrpush.prev = NULL;*/
9819 struct parsefile *pf = g_parsefile;
9827 g_parsefile = pf->prev;
9833 * Return to top level.
9838 while (g_parsefile != &basepf)
9843 * Close the file(s) that the shell is reading commands from. Called
9844 * after a fork is done.
9850 if (g_parsefile->pf_fd > 0) {
9851 close(g_parsefile->pf_fd);
9852 g_parsefile->pf_fd = 0;
9857 * Like setinputfile, but takes an open file descriptor. Call this with
9861 setinputfd(int fd, int push)
9863 close_on_exec_on(fd);
9866 g_parsefile->buf = NULL;
9868 g_parsefile->pf_fd = fd;
9869 if (g_parsefile->buf == NULL)
9870 g_parsefile->buf = ckmalloc(IBUFSIZ);
9871 g_parsefile->left_in_buffer = 0;
9872 g_parsefile->left_in_line = 0;
9873 g_parsefile->linno = 1;
9877 * Set the input to take input from a file. If push is set, push the
9878 * old input onto the stack first.
9881 setinputfile(const char *fname, int flags)
9887 fd = open(fname, O_RDONLY);
9889 if (flags & INPUT_NOFILE_OK)
9891 ash_msg_and_raise_error("can't open '%s'", fname);
9894 fd2 = copyfd(fd, 10);
9897 ash_msg_and_raise_error("out of file descriptors");
9900 setinputfd(fd, flags & INPUT_PUSH_FILE);
9907 * Like setinputfile, but takes input from a string.
9910 setinputstring(char *string)
9914 g_parsefile->next_to_pgetc = string;
9915 g_parsefile->left_in_line = strlen(string);
9916 g_parsefile->buf = NULL;
9917 g_parsefile->linno = 1;
9922 /* ============ mail.c
9924 * Routines to check for mail.
9929 #define MAXMBOXES 10
9931 /* times of mailboxes */
9932 static time_t mailtime[MAXMBOXES];
9933 /* Set if MAIL or MAILPATH is changed. */
9934 static smallint mail_var_path_changed;
9937 * Print appropriate message(s) if mail has arrived.
9938 * If mail_var_path_changed is set,
9939 * then the value of MAIL has mail_var_path_changed,
9940 * so we just update the values.
9949 struct stackmark smark;
9952 setstackmark(&smark);
9953 mpath = mpathset() ? mpathval() : mailval();
9954 for (mtp = mailtime; mtp < mailtime + MAXMBOXES; mtp++) {
9955 p = path_advance(&mpath, nullstr);
9960 for (q = p; *q; q++)
9966 q[-1] = '\0'; /* delete trailing '/' */
9967 if (stat(p, &statb) < 0) {
9971 if (!mail_var_path_changed && statb.st_mtime != *mtp) {
9974 pathopt ? pathopt : "you have mail"
9977 *mtp = statb.st_mtime;
9979 mail_var_path_changed = 0;
9980 popstackmark(&smark);
9983 static void FAST_FUNC
9984 changemail(const char *val UNUSED_PARAM)
9986 mail_var_path_changed = 1;
9989 #endif /* ASH_MAIL */
9992 /* ============ ??? */
9995 * Set the shell parameters.
9998 setparam(char **argv)
10004 for (nparam = 0; argv[nparam]; nparam++)
10006 ap = newparam = ckmalloc((nparam + 1) * sizeof(*ap));
10008 *ap++ = ckstrdup(*argv++);
10011 freeparam(&shellparam);
10012 shellparam.malloced = 1;
10013 shellparam.nparam = nparam;
10014 shellparam.p = newparam;
10015 #if ENABLE_ASH_GETOPTS
10016 shellparam.optind = 1;
10017 shellparam.optoff = -1;
10022 * Process shell options. The global variable argptr contains a pointer
10023 * to the argument list; we advance it past the options.
10025 * SUSv3 section 2.8.1 "Consequences of Shell Errors" says:
10026 * For a non-interactive shell, an error condition encountered
10027 * by a special built-in ... shall cause the shell to write a diagnostic message
10028 * to standard error and exit as shown in the following table:
10029 * Error Special Built-In
10031 * Utility syntax error (option or operand error) Shall exit
10033 * However, in bug 1142 (http://busybox.net/bugs/view.php?id=1142)
10034 * we see that bash does not do that (set "finishes" with error code 1 instead,
10035 * and shell continues), and people rely on this behavior!
10037 * set -o barfoo 2>/dev/null
10040 * Oh well. Let's mimic that.
10043 plus_minus_o(char *name, int val)
10048 for (i = 0; i < NOPTS; i++) {
10049 if (strcmp(name, optnames(i)) == 0) {
10054 ash_msg("illegal option %co %s", val ? '-' : '+', name);
10057 for (i = 0; i < NOPTS; i++) {
10059 out1fmt("%-16s%s\n", optnames(i), optlist[i] ? "on" : "off");
10061 out1fmt("set %co %s\n", optlist[i] ? '-' : '+', optnames(i));
10067 setoption(int flag, int val)
10071 for (i = 0; i < NOPTS; i++) {
10072 if (optletters(i) == flag) {
10077 ash_msg_and_raise_error("illegal option %c%c", val ? '-' : '+', flag);
10081 options(int cmdline)
10089 while ((p = *argptr) != NULL) {
10091 if (c != '-' && c != '+')
10094 val = 0; /* val = 0 if c == '+' */
10097 if (p[0] == '\0' || LONE_DASH(p)) {
10099 /* "-" means turn off -x and -v */
10102 /* "--" means reset params */
10103 else if (*argptr == NULL)
10106 break; /* "-" or "--" terminates options */
10109 /* first char was + or - */
10110 while ((c = *p++) != '\0') {
10111 /* bash 3.2 indeed handles -c CMD and +c CMD the same */
10112 if (c == 'c' && cmdline) {
10113 minusc = p; /* command is after shell args */
10114 } else if (c == 'o') {
10115 if (plus_minus_o(*argptr, val)) {
10116 /* it already printed err message */
10117 return 1; /* error */
10121 } else if (cmdline && (c == 'l')) { /* -l or +l == --login */
10123 /* bash does not accept +-login, we also won't */
10124 } else if (cmdline && val && (c == '-')) { /* long options */
10125 if (strcmp(p, "login") == 0)
10137 * The shift builtin command.
10139 static int FAST_FUNC
10140 shiftcmd(int argc UNUSED_PARAM, char **argv)
10147 n = number(argv[1]);
10148 if (n > shellparam.nparam)
10149 n = 0; /* bash compat, was = shellparam.nparam; */
10151 shellparam.nparam -= n;
10152 for (ap1 = shellparam.p; --n >= 0; ap1++) {
10153 if (shellparam.malloced)
10156 ap2 = shellparam.p;
10157 while ((*ap2++ = *ap1++) != NULL)
10159 #if ENABLE_ASH_GETOPTS
10160 shellparam.optind = 1;
10161 shellparam.optoff = -1;
10168 * POSIX requires that 'set' (but not export or readonly) output the
10169 * variables in lexicographic order - by the locale's collating order (sigh).
10170 * Maybe we could keep them in an ordered balanced binary tree
10171 * instead of hashed lists.
10172 * For now just roll 'em through qsort for printing...
10175 showvars(const char *sep_prefix, int on, int off)
10178 char **ep, **epend;
10180 ep = listvars(on, off, &epend);
10181 qsort(ep, epend - ep, sizeof(char *), vpcmp);
10183 sep = *sep_prefix ? " " : sep_prefix;
10185 for (; ep < epend; ep++) {
10189 p = strchrnul(*ep, '=');
10192 q = single_quote(++p);
10193 out1fmt("%s%s%.*s%s\n", sep_prefix, sep, (int)(p - *ep), *ep, q);
10199 * The set command builtin.
10201 static int FAST_FUNC
10202 setcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
10207 return showvars(nullstr, 0, VUNSET);
10210 if (!options(0)) { /* if no parse error... */
10213 if (*argptr != NULL) {
10221 #if ENABLE_ASH_RANDOM_SUPPORT
10222 static void FAST_FUNC
10223 change_random(const char *value)
10227 if (value == NULL) {
10228 /* "get", generate */
10229 t = next_random(&random_gen);
10230 /* set without recursion */
10231 setvar(vrandom.var_text, utoa(t), VNOFUNC);
10232 vrandom.flags &= ~VNOFUNC;
10235 t = strtoul(value, NULL, 10);
10236 INIT_RANDOM_T(&random_gen, (t ? t : 1), t);
10241 #if ENABLE_ASH_GETOPTS
10243 getopts(char *optstr, char *optvar, char **optfirst, int *param_optind, int *optoff)
10252 if (*param_optind < 1)
10254 optnext = optfirst + *param_optind - 1;
10256 if (*param_optind <= 1 || *optoff < 0 || (int)strlen(optnext[-1]) < *optoff)
10259 p = optnext[-1] + *optoff;
10260 if (p == NULL || *p == '\0') {
10261 /* Current word is done, advance */
10263 if (p == NULL || *p != '-' || *++p == '\0') {
10270 if (LONE_DASH(p)) /* check for "--" */
10275 for (q = optstr; *q != c;) {
10277 if (optstr[0] == ':') {
10280 err |= setvarsafe("OPTARG", s, 0);
10282 fprintf(stderr, "Illegal option -%c\n", c);
10283 unsetvar("OPTARG");
10293 if (*p == '\0' && (p = *optnext) == NULL) {
10294 if (optstr[0] == ':') {
10297 err |= setvarsafe("OPTARG", s, 0);
10300 fprintf(stderr, "No arg for -%c option\n", c);
10301 unsetvar("OPTARG");
10309 err |= setvarsafe("OPTARG", p, 0);
10312 err |= setvarsafe("OPTARG", nullstr, 0);
10314 *optoff = p ? p - *(optnext - 1) : -1;
10315 *param_optind = optnext - optfirst + 1;
10316 fmtstr(s, sizeof(s), "%d", *param_optind);
10317 err |= setvarsafe("OPTIND", s, VNOFUNC);
10320 err |= setvarsafe(optvar, s, 0);
10324 flush_stdout_stderr();
10325 raise_exception(EXERROR);
10331 * The getopts builtin. Shellparam.optnext points to the next argument
10332 * to be processed. Shellparam.optptr points to the next character to
10333 * be processed in the current argument. If shellparam.optnext is NULL,
10334 * then it's the first time getopts has been called.
10336 static int FAST_FUNC
10337 getoptscmd(int argc, char **argv)
10342 ash_msg_and_raise_error("usage: getopts optstring var [arg]");
10344 optbase = shellparam.p;
10345 if (shellparam.optind > shellparam.nparam + 1) {
10346 shellparam.optind = 1;
10347 shellparam.optoff = -1;
10350 optbase = &argv[3];
10351 if (shellparam.optind > argc - 2) {
10352 shellparam.optind = 1;
10353 shellparam.optoff = -1;
10357 return getopts(argv[1], argv[2], optbase, &shellparam.optind,
10358 &shellparam.optoff);
10360 #endif /* ASH_GETOPTS */
10363 /* ============ Shell parser */
10366 struct heredoc *next; /* next here document in list */
10367 union node *here; /* redirection node */
10368 char *eofmark; /* string indicating end of input */
10369 smallint striptabs; /* if set, strip leading tabs */
10372 static smallint tokpushback; /* last token pushed back */
10373 static smallint parsebackquote; /* nonzero if we are inside backquotes */
10374 static smallint quoteflag; /* set if (part of) last token was quoted */
10375 static token_id_t lasttoken; /* last token read (integer id Txxx) */
10376 static struct heredoc *heredoclist; /* list of here documents to read */
10377 static char *wordtext; /* text of last word returned by readtoken */
10378 static struct nodelist *backquotelist;
10379 static union node *redirnode;
10380 static struct heredoc *heredoc;
10382 static const char *
10383 tokname(char *buf, int tok)
10386 return tokname_array[tok] + 1;
10387 sprintf(buf, "\"%s\"", tokname_array[tok] + 1);
10391 /* raise_error_unexpected_syntax:
10392 * Called when an unexpected token is read during the parse. The argument
10393 * is the token that is expected, or -1 if more than one type of token can
10394 * occur at this point.
10396 static void raise_error_unexpected_syntax(int) NORETURN;
10398 raise_error_unexpected_syntax(int token)
10404 l = sprintf(msg, "unexpected %s", tokname(buf, lasttoken));
10406 sprintf(msg + l, " (expecting %s)", tokname(buf, token));
10407 raise_error_syntax(msg);
10411 #define EOFMARKLEN 79
10413 /* parsing is heavily cross-recursive, need these forward decls */
10414 static union node *andor(void);
10415 static union node *pipeline(void);
10416 static union node *parse_command(void);
10417 static void parseheredoc(void);
10418 static char peektoken(void);
10419 static int readtoken(void);
10421 static union node *
10424 union node *n1, *n2, *n3;
10427 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10428 if (nlflag == 2 && peektoken())
10434 if (tok == TBACKGND) {
10435 if (n2->type == NPIPE) {
10436 n2->npipe.pipe_backgnd = 1;
10438 if (n2->type != NREDIR) {
10439 n3 = stzalloc(sizeof(struct nredir));
10441 /*n3->nredir.redirect = NULL; - stzalloc did it */
10444 n2->type = NBACKGND;
10450 n3 = stzalloc(sizeof(struct nbinary));
10452 n3->nbinary.ch1 = n1;
10453 n3->nbinary.ch2 = n2;
10469 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10477 pungetc(); /* push back EOF on input */
10481 raise_error_unexpected_syntax(-1);
10488 static union node *
10491 union node *n1, *n2, *n3;
10499 } else if (t == TOR) {
10505 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10507 n3 = stzalloc(sizeof(struct nbinary));
10509 n3->nbinary.ch1 = n1;
10510 n3->nbinary.ch2 = n2;
10515 static union node *
10518 union node *n1, *n2, *pipenode;
10519 struct nodelist *lp, *prev;
10523 TRACE(("pipeline: entered\n"));
10524 if (readtoken() == TNOT) {
10526 checkkwd = CHKKWD | CHKALIAS;
10529 n1 = parse_command();
10530 if (readtoken() == TPIPE) {
10531 pipenode = stzalloc(sizeof(struct npipe));
10532 pipenode->type = NPIPE;
10533 /*pipenode->npipe.pipe_backgnd = 0; - stzalloc did it */
10534 lp = stzalloc(sizeof(struct nodelist));
10535 pipenode->npipe.cmdlist = lp;
10539 lp = stzalloc(sizeof(struct nodelist));
10540 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10541 lp->n = parse_command();
10543 } while (readtoken() == TPIPE);
10549 n2 = stzalloc(sizeof(struct nnot));
10557 static union node *
10562 n = stzalloc(sizeof(struct narg));
10564 /*n->narg.next = NULL; - stzalloc did it */
10565 n->narg.text = wordtext;
10566 n->narg.backquote = backquotelist;
10571 fixredir(union node *n, const char *text, int err)
10575 TRACE(("Fix redir %s %d\n", text, err));
10577 n->ndup.vname = NULL;
10579 fd = bb_strtou(text, NULL, 10);
10580 if (!errno && fd >= 0)
10581 n->ndup.dupfd = fd;
10582 else if (LONE_DASH(text))
10583 n->ndup.dupfd = -1;
10586 raise_error_syntax("bad fd number");
10587 n->ndup.vname = makename();
10592 * Returns true if the text contains nothing to expand (no dollar signs
10596 noexpand(const char *text)
10600 while ((c = *text++) != '\0') {
10601 if (c == CTLQUOTEMARK)
10605 else if (SIT(c, BASESYNTAX) == CCTL)
10614 union node *n = redirnode;
10616 if (readtoken() != TWORD)
10617 raise_error_unexpected_syntax(-1);
10618 if (n->type == NHERE) {
10619 struct heredoc *here = heredoc;
10623 if (quoteflag == 0)
10625 TRACE(("Here document %d\n", n->type));
10626 if (!noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN)
10627 raise_error_syntax("illegal eof marker for << redirection");
10628 rmescapes(wordtext, 0);
10629 here->eofmark = wordtext;
10631 if (heredoclist == NULL)
10632 heredoclist = here;
10634 for (p = heredoclist; p->next; p = p->next)
10638 } else if (n->type == NTOFD || n->type == NFROMFD) {
10639 fixredir(n, wordtext, 0);
10641 n->nfile.fname = makename();
10645 static union node *
10648 union node *args, **app;
10649 union node *n = NULL;
10650 union node *vars, **vpp;
10651 union node **rpp, *redir;
10653 #if ENABLE_ASH_BASH_COMPAT
10654 smallint double_brackets_flag = 0;
10664 savecheckkwd = CHKALIAS;
10667 checkkwd = savecheckkwd;
10670 #if ENABLE_ASH_BASH_COMPAT
10671 case TAND: /* "&&" */
10672 case TOR: /* "||" */
10673 if (!double_brackets_flag) {
10677 wordtext = (char *) (t == TAND ? "-a" : "-o");
10680 n = stzalloc(sizeof(struct narg));
10682 /*n->narg.next = NULL; - stzalloc did it */
10683 n->narg.text = wordtext;
10684 #if ENABLE_ASH_BASH_COMPAT
10685 if (strcmp("[[", wordtext) == 0)
10686 double_brackets_flag = 1;
10687 else if (strcmp("]]", wordtext) == 0)
10688 double_brackets_flag = 0;
10690 n->narg.backquote = backquotelist;
10691 if (savecheckkwd && isassignment(wordtext)) {
10693 vpp = &n->narg.next;
10696 app = &n->narg.next;
10701 *rpp = n = redirnode;
10702 rpp = &n->nfile.next;
10703 parsefname(); /* read name of redirection file */
10706 if (args && app == &args->narg.next
10709 struct builtincmd *bcmd;
10712 /* We have a function */
10713 if (readtoken() != TRP)
10714 raise_error_unexpected_syntax(TRP);
10715 name = n->narg.text;
10716 if (!goodname(name)
10717 || ((bcmd = find_builtin(name)) && IS_BUILTIN_SPECIAL(bcmd))
10719 raise_error_syntax("bad function name");
10722 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10723 n->narg.next = parse_command();
10736 n = stzalloc(sizeof(struct ncmd));
10738 n->ncmd.args = args;
10739 n->ncmd.assign = vars;
10740 n->ncmd.redirect = redir;
10744 static union node *
10745 parse_command(void)
10747 union node *n1, *n2;
10748 union node *ap, **app;
10749 union node *cp, **cpp;
10750 union node *redir, **rpp;
10757 switch (readtoken()) {
10759 raise_error_unexpected_syntax(-1);
10762 n1 = stzalloc(sizeof(struct nif));
10764 n1->nif.test = list(0);
10765 if (readtoken() != TTHEN)
10766 raise_error_unexpected_syntax(TTHEN);
10767 n1->nif.ifpart = list(0);
10769 while (readtoken() == TELIF) {
10770 n2->nif.elsepart = stzalloc(sizeof(struct nif));
10771 n2 = n2->nif.elsepart;
10773 n2->nif.test = list(0);
10774 if (readtoken() != TTHEN)
10775 raise_error_unexpected_syntax(TTHEN);
10776 n2->nif.ifpart = list(0);
10778 if (lasttoken == TELSE)
10779 n2->nif.elsepart = list(0);
10781 n2->nif.elsepart = NULL;
10789 n1 = stzalloc(sizeof(struct nbinary));
10790 n1->type = (lasttoken == TWHILE) ? NWHILE : NUNTIL;
10791 n1->nbinary.ch1 = list(0);
10794 TRACE(("expecting DO got '%s' %s\n", tokname_array[got] + 1,
10795 got == TWORD ? wordtext : ""));
10796 raise_error_unexpected_syntax(TDO);
10798 n1->nbinary.ch2 = list(0);
10803 if (readtoken() != TWORD || quoteflag || !goodname(wordtext))
10804 raise_error_syntax("bad for loop variable");
10805 n1 = stzalloc(sizeof(struct nfor));
10807 n1->nfor.var = wordtext;
10808 checkkwd = CHKKWD | CHKALIAS;
10809 if (readtoken() == TIN) {
10811 while (readtoken() == TWORD) {
10812 n2 = stzalloc(sizeof(struct narg));
10814 /*n2->narg.next = NULL; - stzalloc did it */
10815 n2->narg.text = wordtext;
10816 n2->narg.backquote = backquotelist;
10818 app = &n2->narg.next;
10821 n1->nfor.args = ap;
10822 if (lasttoken != TNL && lasttoken != TSEMI)
10823 raise_error_unexpected_syntax(-1);
10825 n2 = stzalloc(sizeof(struct narg));
10827 /*n2->narg.next = NULL; - stzalloc did it */
10828 n2->narg.text = (char *)dolatstr;
10829 /*n2->narg.backquote = NULL;*/
10830 n1->nfor.args = n2;
10832 * Newline or semicolon here is optional (but note
10833 * that the original Bourne shell only allowed NL).
10835 if (lasttoken != TNL && lasttoken != TSEMI)
10838 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10839 if (readtoken() != TDO)
10840 raise_error_unexpected_syntax(TDO);
10841 n1->nfor.body = list(0);
10845 n1 = stzalloc(sizeof(struct ncase));
10847 if (readtoken() != TWORD)
10848 raise_error_unexpected_syntax(TWORD);
10849 n1->ncase.expr = n2 = stzalloc(sizeof(struct narg));
10851 /*n2->narg.next = NULL; - stzalloc did it */
10852 n2->narg.text = wordtext;
10853 n2->narg.backquote = backquotelist;
10855 checkkwd = CHKKWD | CHKALIAS;
10856 } while (readtoken() == TNL);
10857 if (lasttoken != TIN)
10858 raise_error_unexpected_syntax(TIN);
10859 cpp = &n1->ncase.cases;
10861 checkkwd = CHKNL | CHKKWD;
10863 while (t != TESAC) {
10864 if (lasttoken == TLP)
10866 *cpp = cp = stzalloc(sizeof(struct nclist));
10868 app = &cp->nclist.pattern;
10870 *app = ap = stzalloc(sizeof(struct narg));
10872 /*ap->narg.next = NULL; - stzalloc did it */
10873 ap->narg.text = wordtext;
10874 ap->narg.backquote = backquotelist;
10875 if (readtoken() != TPIPE)
10877 app = &ap->narg.next;
10880 //ap->narg.next = NULL;
10881 if (lasttoken != TRP)
10882 raise_error_unexpected_syntax(TRP);
10883 cp->nclist.body = list(2);
10885 cpp = &cp->nclist.next;
10887 checkkwd = CHKNL | CHKKWD;
10891 raise_error_unexpected_syntax(TENDCASE);
10898 n1 = stzalloc(sizeof(struct nredir));
10899 n1->type = NSUBSHELL;
10900 n1->nredir.n = list(0);
10901 /*n1->nredir.redirect = NULL; - stzalloc did it */
10911 return simplecmd();
10914 if (readtoken() != t)
10915 raise_error_unexpected_syntax(t);
10918 /* Now check for redirection which may follow command */
10919 checkkwd = CHKKWD | CHKALIAS;
10921 while (readtoken() == TREDIR) {
10922 *rpp = n2 = redirnode;
10923 rpp = &n2->nfile.next;
10929 if (n1->type != NSUBSHELL) {
10930 n2 = stzalloc(sizeof(struct nredir));
10935 n1->nredir.redirect = redir;
10940 #if ENABLE_ASH_BASH_COMPAT
10941 static int decode_dollar_squote(void)
10943 static const char C_escapes[] ALIGN1 = "nrbtfav""x\\01234567";
10949 p = strchr(C_escapes, c);
10954 if ((unsigned char)(c - '0') <= 7) { /* \ooo */
10958 } while ((unsigned char)(c - '0') <= 7 && --cnt);
10960 } else if (c == 'x') { /* \xHH */
10964 } while (isxdigit(c) && --cnt);
10966 if (cnt == 3) { /* \x but next char is "bad" */
10970 } else { /* simple seq like \\ or \t */
10975 c = bb_process_escape_sequence((void*)&p);
10976 } else { /* unrecognized "\z": print both chars unless ' or " */
10977 if (c != '\'' && c != '"') {
10979 c |= 0x100; /* "please encode \, then me" */
10987 * If eofmark is NULL, read a word or a redirection symbol. If eofmark
10988 * is not NULL, read a here document. In the latter case, eofmark is the
10989 * word which marks the end of the document and striptabs is true if
10990 * leading tabs should be stripped from the document. The argument c
10991 * is the first character of the input token or document.
10993 * Because C does not have internal subroutines, I have simulated them
10994 * using goto's to implement the subroutine linkage. The following macros
10995 * will run code that appears at the end of readtoken1.
10997 #define CHECKEND() {goto checkend; checkend_return:;}
10998 #define PARSEREDIR() {goto parseredir; parseredir_return:;}
10999 #define PARSESUB() {goto parsesub; parsesub_return:;}
11000 #define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;}
11001 #define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;}
11002 #define PARSEARITH() {goto parsearith; parsearith_return:;}
11004 readtoken1(int c, int syntax, char *eofmark, int striptabs)
11006 /* NB: syntax parameter fits into smallint */
11007 /* c parameter is an unsigned char or PEOF or PEOA */
11010 char line[EOFMARKLEN + 1];
11011 struct nodelist *bqlist;
11015 smallint prevsyntax; /* syntax before arithmetic */
11016 #if ENABLE_ASH_EXPAND_PRMT
11017 smallint pssyntax; /* we are expanding a prompt string */
11019 int varnest; /* levels of variables expansion */
11020 int arinest; /* levels of arithmetic expansion */
11021 int parenlevel; /* levels of parens in arithmetic */
11022 int dqvarnest; /* levels of variables expansion within double quotes */
11024 IF_ASH_BASH_COMPAT(smallint bash_dollar_squote = 0;)
11027 /* Avoid longjmp clobbering */
11033 (void) &parenlevel;
11036 (void) &prevsyntax;
11039 startlinno = g_parsefile->linno;
11043 #if ENABLE_ASH_EXPAND_PRMT
11044 pssyntax = (syntax == PSSYNTAX);
11048 dblquote = (syntax == DQSYNTAX);
11054 STARTSTACKSTR(out);
11056 /* For each line, until end of word */
11058 CHECKEND(); /* set c to PEOF if at end of here document */
11059 for (;;) { /* until end of line or end of word */
11060 CHECKSTRSPACE(4, out); /* permit 4 calls to USTPUTC */
11061 switch (SIT(c, syntax)) {
11062 case CNL: /* '\n' */
11063 if (syntax == BASESYNTAX)
11064 goto endword; /* exit outer loop */
11066 g_parsefile->linno++;
11070 goto loop; /* continue outer loop */
11075 if (eofmark == NULL || dblquote)
11076 USTPUTC(CTLESC, out);
11077 #if ENABLE_ASH_BASH_COMPAT
11078 if (c == '\\' && bash_dollar_squote) {
11079 c = decode_dollar_squote();
11081 USTPUTC('\\', out);
11082 c = (unsigned char)c;
11088 case CBACK: /* backslash */
11089 c = pgetc_without_PEOA();
11091 USTPUTC(CTLESC, out);
11092 USTPUTC('\\', out);
11094 } else if (c == '\n') {
11098 #if ENABLE_ASH_EXPAND_PRMT
11099 if (c == '$' && pssyntax) {
11100 USTPUTC(CTLESC, out);
11101 USTPUTC('\\', out);
11104 /* Backslash is retained if we are in "str" and next char isn't special */
11109 && (c != '"' || eofmark != NULL)
11111 USTPUTC(CTLESC, out);
11112 USTPUTC('\\', out);
11114 if (SIT(c, SQSYNTAX) == CCTL)
11115 USTPUTC(CTLESC, out);
11123 if (eofmark == NULL) {
11124 USTPUTC(CTLQUOTEMARK, out);
11132 IF_ASH_BASH_COMPAT(bash_dollar_squote = 0;)
11133 if (eofmark != NULL && arinest == 0
11138 if (dqvarnest == 0) {
11139 syntax = BASESYNTAX;
11146 case CVAR: /* '$' */
11147 PARSESUB(); /* parse substitution */
11149 case CENDVAR: /* '}' */
11152 if (dqvarnest > 0) {
11159 #if ENABLE_SH_MATH_SUPPORT
11160 case CLP: /* '(' in arithmetic */
11164 case CRP: /* ')' in arithmetic */
11165 if (parenlevel > 0) {
11168 if (pgetc() == ')') {
11169 if (--arinest == 0) {
11170 syntax = prevsyntax;
11171 dblquote = (syntax == DQSYNTAX);
11176 * unbalanced parens
11177 * (don't 2nd guess - no error)
11185 case CBQUOTE: /* '`' */
11189 goto endword; /* exit outer loop */
11193 if (varnest == 0) {
11194 #if ENABLE_ASH_BASH_COMPAT
11196 if (pgetc() == '>')
11197 c = 0x100 + '>'; /* flag &> */
11201 goto endword; /* exit outer loop */
11203 IF_ASH_ALIAS(if (c != PEOA))
11210 #if ENABLE_SH_MATH_SUPPORT
11211 if (syntax == ARISYNTAX)
11212 raise_error_syntax("missing '))'");
11214 if (syntax != BASESYNTAX && !parsebackquote && eofmark == NULL)
11215 raise_error_syntax("unterminated quoted string");
11216 if (varnest != 0) {
11217 startlinno = g_parsefile->linno;
11219 raise_error_syntax("missing '}'");
11221 USTPUTC('\0', out);
11222 len = out - (char *)stackblock();
11223 out = stackblock();
11224 if (eofmark == NULL) {
11225 if ((c == '>' || c == '<' IF_ASH_BASH_COMPAT( || c == 0x100 + '>'))
11228 if (isdigit_str9(out)) {
11229 PARSEREDIR(); /* passed as params: out, c */
11230 lasttoken = TREDIR;
11233 /* else: non-number X seen, interpret it
11234 * as "NNNX>file" = "NNNX >file" */
11238 quoteflag = quotef;
11239 backquotelist = bqlist;
11240 grabstackblock(len);
11244 /* end of readtoken routine */
11247 * Check to see whether we are at the end of the here document. When this
11248 * is called, c is set to the first character of the next input line. If
11249 * we are at the end of the here document, this routine sets the c to PEOF.
11253 #if ENABLE_ASH_ALIAS
11255 c = pgetc_without_PEOA();
11258 while (c == '\t') {
11259 c = pgetc_without_PEOA();
11262 if (c == *eofmark) {
11263 if (pfgets(line, sizeof(line)) != NULL) {
11267 for (q = eofmark + 1; *q && *p == *q; p++, q++)
11269 if (*p == '\n' && *q == '\0') {
11271 g_parsefile->linno++;
11272 needprompt = doprompt;
11274 pushstring(line, NULL);
11279 goto checkend_return;
11283 * Parse a redirection operator. The variable "out" points to a string
11284 * specifying the fd to be redirected. The variable "c" contains the
11285 * first character of the redirection operator.
11288 /* out is already checked to be a valid number or "" */
11289 int fd = (*out == '\0' ? -1 : atoi(out));
11292 np = stzalloc(sizeof(struct nfile));
11297 np->type = NAPPEND;
11299 np->type = NCLOBBER;
11302 /* it also can be NTO2 (>&file), but we can't figure it out yet */
11308 #if ENABLE_ASH_BASH_COMPAT
11309 else if (c == 0x100 + '>') { /* this flags &> redirection */
11311 pgetc(); /* this is '>', no need to check */
11315 else { /* c == '<' */
11316 /*np->nfile.fd = 0; - stzalloc did it */
11320 if (sizeof(struct nfile) != sizeof(struct nhere)) {
11321 np = stzalloc(sizeof(struct nhere));
11322 /*np->nfile.fd = 0; - stzalloc did it */
11325 heredoc = stzalloc(sizeof(struct heredoc));
11326 heredoc->here = np;
11329 heredoc->striptabs = 1;
11331 /*heredoc->striptabs = 0; - stzalloc did it */
11337 np->type = NFROMFD;
11341 np->type = NFROMTO;
11353 goto parseredir_return;
11357 * Parse a substitution. At this point, we have read the dollar sign
11358 * and nothing else.
11361 /* is_special(c) evaluates to 1 for c in "!#$*-0123456789?@"; 0 otherwise
11362 * (assuming ascii char codes, as the original implementation did) */
11363 #define is_special(c) \
11364 (((unsigned)(c) - 33 < 32) \
11365 && ((0xc1ff920dU >> ((unsigned)(c) - 33)) & 1))
11367 unsigned char subtype;
11372 if (c > 255 /* PEOA or PEOF */
11373 || (c != '(' && c != '{' && !is_name(c) && !is_special(c))
11375 #if ENABLE_ASH_BASH_COMPAT
11377 bash_dollar_squote = 1;
11382 } else if (c == '(') {
11383 /* $(command) or $((arith)) */
11384 if (pgetc() == '(') {
11385 #if ENABLE_SH_MATH_SUPPORT
11388 raise_error_syntax("you disabled math support for $((arith)) syntax");
11395 /* $VAR, $<specialchar>, ${...}, or PEOA/PEOF */
11396 USTPUTC(CTLVAR, out);
11397 typeloc = out - (char *)stackblock();
11398 USTPUTC(VSNORMAL, out);
11399 subtype = VSNORMAL;
11405 c = '#'; /* ${#} - same as $# */
11407 subtype = VSLENGTH; /* ${#VAR} */
11412 if (c <= 255 /* not PEOA or PEOF */ && is_name(c)) {
11413 /* $[{[#]]NAME[}] */
11417 } while (c <= 255 /* not PEOA or PEOF */ && is_in_name(c));
11418 } else if (isdigit(c)) {
11419 /* $[{[#]]NUM[}] */
11423 } while (isdigit(c));
11424 } else if (is_special(c)) {
11425 /* $[{[#]]<specialchar>[}] */
11430 raise_error_syntax("bad substitution");
11432 if (c != '}' && subtype == VSLENGTH) {
11433 /* ${#VAR didn't end with } */
11439 if (subtype == 0) {
11440 /* ${VAR...} but not $VAR or ${#VAR} */
11441 /* c == first char after VAR */
11445 #if ENABLE_ASH_BASH_COMPAT
11446 if (c == ':' || c == '$' || isdigit(c)) {
11447 //TODO: support more general format ${v:EXPR:EXPR},
11448 // where EXPR follows $(()) rules
11449 subtype = VSSUBSTR;
11451 break; /* "goto do_pungetc" is bigger (!) */
11457 static const char types[] ALIGN1 = "}-+?=";
11458 const char *p = strchr(types, c);
11461 subtype = p - types + VSNORMAL;
11467 subtype = (c == '#' ? VSTRIMLEFT : VSTRIMRIGHT);
11474 #if ENABLE_ASH_BASH_COMPAT
11476 /* ${v/[/]pattern/repl} */
11477 //TODO: encode pattern and repl separately.
11478 // Currently ${v/$var_with_slash/repl} is horribly broken
11479 subtype = VSREPLACE;
11483 subtype++; /* VSREPLACEALL */
11491 if (dblquote || arinest)
11493 ((unsigned char *)stackblock())[typeloc] = subtype | flags;
11494 if (subtype != VSNORMAL) {
11496 if (dblquote || arinest) {
11501 goto parsesub_return;
11505 * Called to parse command substitutions. Newstyle is set if the command
11506 * is enclosed inside $(...); nlpp is a pointer to the head of the linked
11507 * list of commands (passed by reference), and savelen is the number of
11508 * characters on the top of the stack which must be preserved.
11511 struct nodelist **nlpp;
11514 char *volatile str;
11515 struct jmploc jmploc;
11516 struct jmploc *volatile savehandler;
11518 smallint saveprompt = 0;
11521 (void) &saveprompt;
11523 savepbq = parsebackquote;
11524 if (setjmp(jmploc.loc)) {
11526 parsebackquote = 0;
11527 exception_handler = savehandler;
11528 longjmp(exception_handler->loc, 1);
11532 savelen = out - (char *)stackblock();
11534 str = ckmalloc(savelen);
11535 memcpy(str, stackblock(), savelen);
11537 savehandler = exception_handler;
11538 exception_handler = &jmploc;
11541 /* We must read until the closing backquote, giving special
11542 treatment to some slashes, and then push the string and
11543 reread it as input, interpreting it normally. */
11550 STARTSTACKSTR(pout);
11563 g_parsefile->linno++;
11567 * If eating a newline, avoid putting
11568 * the newline into the new character
11569 * stream (via the STPUTC after the
11574 if (pc != '\\' && pc != '`' && pc != '$'
11575 && (!dblquote || pc != '"')
11577 STPUTC('\\', pout);
11579 if (pc <= 255 /* not PEOA or PEOF */) {
11585 IF_ASH_ALIAS(case PEOA:)
11586 startlinno = g_parsefile->linno;
11587 raise_error_syntax("EOF in backquote substitution");
11590 g_parsefile->linno++;
11591 needprompt = doprompt;
11600 STPUTC('\0', pout);
11601 psavelen = pout - (char *)stackblock();
11602 if (psavelen > 0) {
11603 pstr = grabstackstr(pout);
11604 setinputstring(pstr);
11609 nlpp = &(*nlpp)->next;
11610 *nlpp = stzalloc(sizeof(**nlpp));
11611 /* (*nlpp)->next = NULL; - stzalloc did it */
11612 parsebackquote = oldstyle;
11615 saveprompt = doprompt;
11622 doprompt = saveprompt;
11623 else if (readtoken() != TRP)
11624 raise_error_unexpected_syntax(TRP);
11629 * Start reading from old file again, ignoring any pushed back
11630 * tokens left from the backquote parsing
11635 while (stackblocksize() <= savelen)
11637 STARTSTACKSTR(out);
11639 memcpy(out, str, savelen);
11640 STADJUST(savelen, out);
11646 parsebackquote = savepbq;
11647 exception_handler = savehandler;
11648 if (arinest || dblquote)
11649 USTPUTC(CTLBACKQ | CTLQUOTE, out);
11651 USTPUTC(CTLBACKQ, out);
11653 goto parsebackq_oldreturn;
11654 goto parsebackq_newreturn;
11657 #if ENABLE_SH_MATH_SUPPORT
11659 * Parse an arithmetic expansion (indicate start of one and set state)
11662 if (++arinest == 1) {
11663 prevsyntax = syntax;
11664 syntax = ARISYNTAX;
11665 USTPUTC(CTLARI, out);
11672 * we collapse embedded arithmetic expansion to
11673 * parenthesis, which should be equivalent
11677 goto parsearith_return;
11681 } /* end of readtoken */
11684 * Read the next input token.
11685 * If the token is a word, we set backquotelist to the list of cmds in
11686 * backquotes. We set quoteflag to true if any part of the word was
11688 * If the token is TREDIR, then we set redirnode to a structure containing
11690 * In all cases, the variable startlinno is set to the number of the line
11691 * on which the token starts.
11693 * [Change comment: here documents and internal procedures]
11694 * [Readtoken shouldn't have any arguments. Perhaps we should make the
11695 * word parsing code into a separate routine. In this case, readtoken
11696 * doesn't need to have any internal procedures, but parseword does.
11697 * We could also make parseoperator in essence the main routine, and
11698 * have parseword (readtoken1?) handle both words and redirection.]
11700 #define NEW_xxreadtoken
11701 #ifdef NEW_xxreadtoken
11702 /* singles must be first! */
11703 static const char xxreadtoken_chars[7] ALIGN1 = {
11704 '\n', '(', ')', /* singles */
11705 '&', '|', ';', /* doubles */
11709 #define xxreadtoken_singles 3
11710 #define xxreadtoken_doubles 3
11712 static const char xxreadtoken_tokens[] ALIGN1 = {
11713 TNL, TLP, TRP, /* only single occurrence allowed */
11714 TBACKGND, TPIPE, TSEMI, /* if single occurrence */
11715 TEOF, /* corresponds to trailing nul */
11716 TAND, TOR, TENDCASE /* if double occurrence */
11731 startlinno = g_parsefile->linno;
11732 for (;;) { /* until token or start of word found */
11734 if (c == ' ' || c == '\t' IF_ASH_ALIAS( || c == PEOA))
11738 while ((c = pgetc()) != '\n' && c != PEOF)
11741 } else if (c == '\\') {
11742 if (pgetc() != '\n') {
11744 break; /* return readtoken1(...) */
11746 startlinno = ++g_parsefile->linno;
11752 p = xxreadtoken_chars + sizeof(xxreadtoken_chars) - 1;
11755 g_parsefile->linno++;
11756 needprompt = doprompt;
11759 p = strchr(xxreadtoken_chars, c);
11761 break; /* return readtoken1(...) */
11763 if ((int)(p - xxreadtoken_chars) >= xxreadtoken_singles) {
11765 if (cc == c) { /* double occurrence? */
11766 p += xxreadtoken_doubles + 1;
11769 #if ENABLE_ASH_BASH_COMPAT
11770 if (c == '&' && cc == '>') /* &> */
11771 break; /* return readtoken1(...) */
11776 lasttoken = xxreadtoken_tokens[p - xxreadtoken_chars];
11781 return readtoken1(c, BASESYNTAX, (char *) NULL, 0);
11783 #else /* old xxreadtoken */
11784 #define RETURN(token) return lasttoken = token
11797 startlinno = g_parsefile->linno;
11798 for (;;) { /* until token or start of word found */
11801 case ' ': case '\t':
11802 IF_ASH_ALIAS(case PEOA:)
11805 while ((c = pgetc()) != '\n' && c != PEOF)
11810 if (pgetc() == '\n') {
11811 startlinno = ++g_parsefile->linno;
11819 g_parsefile->linno++;
11820 needprompt = doprompt;
11825 if (pgetc() == '&')
11830 if (pgetc() == '|')
11835 if (pgetc() == ';')
11848 return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
11851 #endif /* old xxreadtoken */
11858 smallint alreadyseen = tokpushback;
11861 #if ENABLE_ASH_ALIAS
11870 if (checkkwd & CHKNL) {
11877 if (t != TWORD || quoteflag) {
11882 * check for keywords
11884 if (checkkwd & CHKKWD) {
11885 const char *const *pp;
11887 pp = findkwd(wordtext);
11889 lasttoken = t = pp - tokname_array;
11890 TRACE(("keyword '%s' recognized\n", tokname_array[t] + 1));
11895 if (checkkwd & CHKALIAS) {
11896 #if ENABLE_ASH_ALIAS
11898 ap = lookupalias(wordtext, 1);
11901 pushstring(ap->val, ap);
11911 TRACE(("token '%s' %s\n", tokname_array[t] + 1, t == TWORD ? wordtext : ""));
11913 TRACE(("reread token '%s' %s\n", tokname_array[t] + 1, t == TWORD ? wordtext : ""));
11925 return tokname_array[t][0];
11929 * Read and parse a command. Returns NODE_EOF on end of file.
11930 * (NULL is a valid parse tree indicating a blank line.)
11932 static union node *
11933 parsecmd(int interact)
11938 doprompt = interact;
11940 setprompt(doprompt);
11952 * Input any here documents.
11957 struct heredoc *here;
11960 here = heredoclist;
11961 heredoclist = NULL;
11967 readtoken1(pgetc(), here->here->type == NHERE? SQSYNTAX : DQSYNTAX,
11968 here->eofmark, here->striptabs);
11969 n = stzalloc(sizeof(struct narg));
11970 n->narg.type = NARG;
11971 /*n->narg.next = NULL; - stzalloc did it */
11972 n->narg.text = wordtext;
11973 n->narg.backquote = backquotelist;
11974 here->here->nhere.doc = n;
11981 * called by editline -- any expansions to the prompt should be added here.
11983 #if ENABLE_ASH_EXPAND_PRMT
11984 static const char *
11985 expandstr(const char *ps)
11989 /* XXX Fix (char *) cast. It _is_ a bug. ps is variable's value,
11990 * and token processing _can_ alter it (delete NULs etc). */
11991 setinputstring((char *)ps);
11992 readtoken1(pgetc(), PSSYNTAX, nullstr, 0);
11995 n.narg.type = NARG;
11996 n.narg.next = NULL;
11997 n.narg.text = wordtext;
11998 n.narg.backquote = backquotelist;
12000 expandarg(&n, NULL, 0);
12001 return stackblock();
12006 * Execute a command or commands contained in a string.
12009 evalstring(char *s, int mask)
12012 struct stackmark smark;
12016 setstackmark(&smark);
12019 while ((n = parsecmd(0)) != NODE_EOF) {
12021 popstackmark(&smark);
12034 * The eval command.
12036 static int FAST_FUNC
12037 evalcmd(int argc UNUSED_PARAM, char **argv)
12046 STARTSTACKSTR(concat);
12048 concat = stack_putstr(p, concat);
12052 STPUTC(' ', concat);
12054 STPUTC('\0', concat);
12055 p = grabstackstr(concat);
12057 evalstring(p, ~SKIPEVAL);
12063 * Read and execute commands.
12064 * "Top" is nonzero for the top level command loop;
12065 * it turns on prompting if the shell is interactive.
12071 struct stackmark smark;
12075 TRACE(("cmdloop(%d) called\n", top));
12079 setstackmark(&smark);
12082 showjobs(stderr, SHOW_CHANGED);
12085 if (iflag && top) {
12087 #if ENABLE_ASH_MAIL
12091 n = parsecmd(inter);
12093 if (DEBUG > 2 && debug && (n != NODE_EOF))
12096 if (n == NODE_EOF) {
12097 if (!top || numeof >= 50)
12099 if (!stoppedjobs()) {
12102 out2str("\nUse \"exit\" to leave shell.\n");
12105 } else if (nflag == 0) {
12106 /* job_warning can only be 2,1,0. Here 2->1, 1/0->0 */
12111 popstackmark(&smark);
12116 return skip & SKIPEVAL;
12123 * Take commands from a file. To be compatible we should do a path
12124 * search for the file, which is necessary to find sub-commands.
12127 find_dot_file(char *name)
12130 const char *path = pathval();
12133 /* don't try this for absolute or relative paths */
12134 if (strchr(name, '/'))
12137 /* IIRC standards do not say whether . is to be searched.
12138 * And it is even smaller this way, making it unconditional for now:
12140 if (1) { /* ENABLE_ASH_BASH_COMPAT */
12145 while ((fullname = path_advance(&path, name)) != NULL) {
12147 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
12149 * Don't bother freeing here, since it will
12150 * be freed by the caller.
12154 if (fullname != name)
12155 stunalloc(fullname);
12158 /* not found in the PATH */
12159 ash_msg_and_raise_error("%s: not found", name);
12163 static int FAST_FUNC
12164 dotcmd(int argc, char **argv)
12167 struct strlist *sp;
12168 volatile struct shparam saveparam;
12170 for (sp = cmdenviron; sp; sp = sp->next)
12171 setvareq(ckstrdup(sp->text), VSTRFIXED | VTEXTFIXED);
12174 /* bash says: "bash: .: filename argument required" */
12175 return 2; /* bash compat */
12178 /* "false; . empty_file; echo $?" should print 0, not 1: */
12181 fullname = find_dot_file(argv[1]);
12185 if (argc) { /* argc > 0, argv[0] != NULL */
12186 saveparam = shellparam;
12187 shellparam.malloced = 0;
12188 shellparam.nparam = argc;
12189 shellparam.p = argv;
12192 setinputfile(fullname, INPUT_PUSH_FILE);
12193 commandname = fullname;
12198 freeparam(&shellparam);
12199 shellparam = saveparam;
12205 static int FAST_FUNC
12206 exitcmd(int argc UNUSED_PARAM, char **argv)
12211 exitstatus = number(argv[1]);
12212 raise_exception(EXEXIT);
12217 * Read a file containing shell functions.
12220 readcmdfile(char *name)
12222 setinputfile(name, INPUT_PUSH_FILE);
12228 /* ============ find_command inplementation */
12231 * Resolve a command name. If you change this routine, you may have to
12232 * change the shellexec routine as well.
12235 find_command(char *name, struct cmdentry *entry, int act, const char *path)
12237 struct tblentry *cmdp;
12244 struct builtincmd *bcmd;
12246 /* If name contains a slash, don't use PATH or hash table */
12247 if (strchr(name, '/') != NULL) {
12248 entry->u.index = -1;
12249 if (act & DO_ABS) {
12250 while (stat(name, &statb) < 0) {
12252 if (errno == EINTR)
12255 entry->cmdtype = CMDUNKNOWN;
12259 entry->cmdtype = CMDNORMAL;
12263 /* #if ENABLE_FEATURE_SH_STANDALONE... moved after builtin check */
12265 updatetbl = (path == pathval());
12268 if (strstr(path, "%builtin") != NULL)
12269 act |= DO_ALTBLTIN;
12272 /* If name is in the table, check answer will be ok */
12273 cmdp = cmdlookup(name, 0);
12274 if (cmdp != NULL) {
12277 switch (cmdp->cmdtype) {
12295 } else if (cmdp->rehash == 0)
12296 /* if not invalidated by cd, we're done */
12300 /* If %builtin not in path, check for builtin next */
12301 bcmd = find_builtin(name);
12303 if (IS_BUILTIN_REGULAR(bcmd))
12304 goto builtin_success;
12305 if (act & DO_ALTPATH) {
12306 if (!(act & DO_ALTBLTIN))
12307 goto builtin_success;
12308 } else if (builtinloc <= 0) {
12309 goto builtin_success;
12313 #if ENABLE_FEATURE_SH_STANDALONE
12315 int applet_no = find_applet_by_name(name);
12316 if (applet_no >= 0) {
12317 entry->cmdtype = CMDNORMAL;
12318 entry->u.index = -2 - applet_no;
12324 /* We have to search path. */
12325 prev = -1; /* where to start */
12326 if (cmdp && cmdp->rehash) { /* doing a rehash */
12327 if (cmdp->cmdtype == CMDBUILTIN)
12330 prev = cmdp->param.index;
12336 while ((fullname = path_advance(&path, name)) != NULL) {
12337 stunalloc(fullname);
12338 /* NB: code below will still use fullname
12339 * despite it being "unallocated" */
12342 if (prefix(pathopt, "builtin")) {
12344 goto builtin_success;
12347 if ((act & DO_NOFUNC)
12348 || !prefix(pathopt, "func")
12349 ) { /* ignore unimplemented options */
12353 /* if rehash, don't redo absolute path names */
12354 if (fullname[0] == '/' && idx <= prev) {
12357 TRACE(("searchexec \"%s\": no change\n", name));
12360 while (stat(fullname, &statb) < 0) {
12362 if (errno == EINTR)
12365 if (errno != ENOENT && errno != ENOTDIR)
12369 e = EACCES; /* if we fail, this will be the error */
12370 if (!S_ISREG(statb.st_mode))
12372 if (pathopt) { /* this is a %func directory */
12373 stalloc(strlen(fullname) + 1);
12374 /* NB: stalloc will return space pointed by fullname
12375 * (because we don't have any intervening allocations
12376 * between stunalloc above and this stalloc) */
12377 readcmdfile(fullname);
12378 cmdp = cmdlookup(name, 0);
12379 if (cmdp == NULL || cmdp->cmdtype != CMDFUNCTION)
12380 ash_msg_and_raise_error("%s not defined in %s", name, fullname);
12381 stunalloc(fullname);
12384 TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
12386 entry->cmdtype = CMDNORMAL;
12387 entry->u.index = idx;
12391 cmdp = cmdlookup(name, 1);
12392 cmdp->cmdtype = CMDNORMAL;
12393 cmdp->param.index = idx;
12398 /* We failed. If there was an entry for this command, delete it */
12399 if (cmdp && updatetbl)
12400 delete_cmd_entry();
12402 ash_msg("%s: %s", name, errmsg(e, "not found"));
12403 entry->cmdtype = CMDUNKNOWN;
12408 entry->cmdtype = CMDBUILTIN;
12409 entry->u.cmd = bcmd;
12413 cmdp = cmdlookup(name, 1);
12414 cmdp->cmdtype = CMDBUILTIN;
12415 cmdp->param.cmd = bcmd;
12419 entry->cmdtype = cmdp->cmdtype;
12420 entry->u = cmdp->param;
12424 /* ============ trap.c */
12427 * The trap builtin.
12429 static int FAST_FUNC
12430 trapcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12434 int signo, exitcode;
12439 for (signo = 0; signo < NSIG; signo++) {
12440 char *tr = trap_ptr[signo];
12442 /* note: bash adds "SIG", but only if invoked
12443 * as "bash". If called as "sh", or if set -o posix,
12444 * then it prints short signal names.
12445 * We are printing short names: */
12446 out1fmt("trap -- %s %s\n",
12448 get_signame(signo));
12449 /* trap_ptr != trap only if we are in special-cased `trap` code.
12450 * In this case, we will exit very soon, no need to free(). */
12451 /* if (trap_ptr != trap && tp[0]) */
12456 if (trap_ptr != trap) {
12469 signo = get_signum(*ap);
12471 /* Mimic bash message exactly */
12472 ash_msg("%s: invalid signal specification", *ap);
12478 if (LONE_DASH(action))
12481 action = ckstrdup(action);
12485 may_have_traps = 1;
12486 trap[signo] = action;
12497 /* ============ Builtins */
12499 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
12501 * Lists available builtins
12503 static int FAST_FUNC
12504 helpcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12510 "Built-in commands:\n"
12511 "------------------\n");
12512 for (col = 0, i = 0; i < ARRAY_SIZE(builtintab); i++) {
12513 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '),
12514 builtintab[i].name + 1);
12520 #if ENABLE_FEATURE_SH_STANDALONE
12522 const char *a = applet_names;
12524 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '), a);
12529 a += strlen(a) + 1;
12534 return EXIT_SUCCESS;
12536 #endif /* FEATURE_SH_EXTRA_QUIET */
12539 * The export and readonly commands.
12541 static int FAST_FUNC
12542 exportcmd(int argc UNUSED_PARAM, char **argv)
12548 int flag = argv[0][0] == 'r' ? VREADONLY : VEXPORT;
12550 if (nextopt("p") != 'p') {
12555 p = strchr(name, '=');
12559 vp = *findvar(hashvar(name), name);
12565 setvar(name, p, flag);
12566 } while ((name = *++aptr) != NULL);
12570 showvars(argv[0], flag, 0);
12575 * Delete a function if it exists.
12578 unsetfunc(const char *name)
12580 struct tblentry *cmdp;
12582 cmdp = cmdlookup(name, 0);
12583 if (cmdp != NULL && cmdp->cmdtype == CMDFUNCTION)
12584 delete_cmd_entry();
12588 * The unset builtin command. We unset the function before we unset the
12589 * variable to allow a function to be unset when there is a readonly variable
12590 * with the same name.
12592 static int FAST_FUNC
12593 unsetcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12600 while ((i = nextopt("vf")) != 0) {
12604 for (ap = argptr; *ap; ap++) {
12617 static const unsigned char timescmd_str[] ALIGN1 = {
12618 ' ', offsetof(struct tms, tms_utime),
12619 '\n', offsetof(struct tms, tms_stime),
12620 ' ', offsetof(struct tms, tms_cutime),
12621 '\n', offsetof(struct tms, tms_cstime),
12624 static int FAST_FUNC
12625 timescmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12627 unsigned long clk_tck, s, t;
12628 const unsigned char *p;
12631 clk_tck = sysconf(_SC_CLK_TCK);
12636 t = *(clock_t *)(((char *) &buf) + p[1]);
12639 out1fmt("%lum%lu.%03lus%c",
12641 (t * 1000) / clk_tck,
12649 #if ENABLE_SH_MATH_SUPPORT
12651 * The let builtin. Partially stolen from GNU Bash, the Bourne Again SHell.
12652 * Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
12654 * Copyright (C) 2003 Vladimir Oleynik <dzo@simtreas.ru>
12656 static int FAST_FUNC
12657 letcmd(int argc UNUSED_PARAM, char **argv)
12663 ash_msg_and_raise_error("expression expected");
12665 i = ash_arith(*argv);
12673 * The read builtin. Options:
12674 * -r Do not interpret '\' specially
12675 * -s Turn off echo (tty only)
12676 * -n NCHARS Read NCHARS max
12677 * -p PROMPT Display PROMPT on stderr (if input is from tty)
12678 * -t SECONDS Timeout after SECONDS (tty or pipe only)
12679 * -u FD Read from given FD instead of fd 0
12680 * This uses unbuffered input, which may be avoidable in some cases.
12681 * TODO: bash also has:
12682 * -a ARRAY Read into array[0],[1],etc
12683 * -d DELIM End on DELIM char, not newline
12684 * -e Use line editing (tty only)
12686 static int FAST_FUNC
12687 readcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12689 char *opt_n = NULL;
12690 char *opt_p = NULL;
12691 char *opt_t = NULL;
12692 char *opt_u = NULL;
12693 int read_flags = 0;
12697 while ((i = nextopt("p:u:rt:n:s")) != '\0') {
12706 read_flags |= BUILTIN_READ_SILENT;
12712 read_flags |= BUILTIN_READ_RAW;
12722 r = shell_builtin_read(setvar2,
12724 bltinlookup("IFS"), /* can be NULL */
12732 if ((uintptr_t)r > 1)
12733 ash_msg_and_raise_error(r);
12735 return (uintptr_t)r;
12738 static int FAST_FUNC
12739 umaskcmd(int argc UNUSED_PARAM, char **argv)
12741 static const char permuser[3] ALIGN1 = "ugo";
12742 static const char permmode[3] ALIGN1 = "rwx";
12743 static const short permmask[] ALIGN2 = {
12744 S_IRUSR, S_IWUSR, S_IXUSR,
12745 S_IRGRP, S_IWGRP, S_IXGRP,
12746 S_IROTH, S_IWOTH, S_IXOTH
12749 /* TODO: use bb_parse_mode() instead */
12754 int symbolic_mode = 0;
12756 while (nextopt("S") != '\0') {
12767 if (symbolic_mode) {
12771 for (i = 0; i < 3; i++) {
12774 *p++ = permuser[i];
12776 for (j = 0; j < 3; j++) {
12777 if ((mask & permmask[3 * i + j]) == 0) {
12778 *p++ = permmode[j];
12786 out1fmt("%.4o\n", mask);
12789 if (isdigit((unsigned char) *ap)) {
12792 if (*ap >= '8' || *ap < '0')
12793 ash_msg_and_raise_error(msg_illnum, argv[1]);
12794 mask = (mask << 3) + (*ap - '0');
12795 } while (*++ap != '\0');
12798 mask = ~mask & 0777;
12799 if (!bb_parse_mode(ap, &mask)) {
12800 ash_msg_and_raise_error("illegal mode: %s", ap);
12802 umask(~mask & 0777);
12808 static int FAST_FUNC
12809 ulimitcmd(int argc UNUSED_PARAM, char **argv)
12811 return shell_builtin_ulimit(argv);
12814 /* ============ main() and helpers */
12817 * Called to exit the shell.
12819 static void exitshell(void) NORETURN;
12827 status = exitstatus;
12828 TRACE(("pid %d, exitshell(%d)\n", getpid(), status));
12829 if (setjmp(loc.loc)) {
12830 if (exception_type == EXEXIT)
12831 /* dash bug: it just does _exit(exitstatus) here
12832 * but we have to do setjobctl(0) first!
12833 * (bug is still not fixed in dash-0.5.3 - if you run dash
12834 * under Midnight Commander, on exit from dash MC is backgrounded) */
12835 status = exitstatus;
12838 exception_handler = &loc;
12845 flush_stdout_stderr();
12855 /* from input.c: */
12856 /* we will never free this */
12857 basepf.next_to_pgetc = basepf.buf = ckmalloc(IBUFSIZ);
12860 signal(SIGCHLD, SIG_DFL);
12861 /* bash re-enables SIGHUP which is SIG_IGNed on entry.
12862 * Try: "trap '' HUP; bash; echo RET" and type "kill -HUP $$"
12864 signal(SIGHUP, SIG_DFL);
12870 struct stat st1, st2;
12873 for (envp = environ; envp && *envp; envp++) {
12874 if (strchr(*envp, '=')) {
12875 setvareq(*envp, VEXPORT|VTEXTFIXED);
12879 setvar("PPID", utoa(getppid()), 0);
12881 p = lookupvar("PWD");
12883 if (*p != '/' || stat(p, &st1) || stat(".", &st2)
12884 || st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino)
12891 * Process the shell command line arguments.
12894 procargs(char **argv)
12897 const char *xminusc;
12902 /* if (xargv[0]) - mmm, this is always true! */
12904 for (i = 0; i < NOPTS; i++)
12908 /* it already printed err message */
12909 raise_exception(EXERROR);
12913 if (*xargv == NULL) {
12915 ash_msg_and_raise_error(bb_msg_requires_arg, "-c");
12918 if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
12922 for (i = 0; i < NOPTS; i++)
12923 if (optlist[i] == 2)
12928 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
12933 } else if (!sflag) {
12934 setinputfile(*xargv, 0);
12937 commandname = arg0;
12940 shellparam.p = xargv;
12941 #if ENABLE_ASH_GETOPTS
12942 shellparam.optind = 1;
12943 shellparam.optoff = -1;
12945 /* assert(shellparam.malloced == 0 && shellparam.nparam == 0); */
12947 shellparam.nparam++;
12954 * Read /etc/profile or .profile.
12957 read_profile(const char *name)
12961 if (setinputfile(name, INPUT_PUSH_FILE | INPUT_NOFILE_OK) < 0)
12970 * This routine is called when an error or an interrupt occurs in an
12971 * interactive shell and control is returned to the main command loop.
12979 /* from input.c: */
12980 g_parsefile->left_in_buffer = 0;
12981 g_parsefile->left_in_line = 0; /* clear input buffer */
12983 /* from parser.c: */
12986 /* from redir.c: */
12987 clearredir(/*drop:*/ 0);
12991 static short profile_buf[16384];
12992 extern int etext();
12996 * Main routine. We initialize things, parse the arguments, execute
12997 * profiles if we're a login shell, and then call cmdloop to execute
12998 * commands. The setjmp call sets up the location to jump to when an
12999 * exception occurs. When an exception occurs the variable "state"
13000 * is used to figure out how far we had gotten.
13002 int ash_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
13003 int ash_main(int argc UNUSED_PARAM, char **argv)
13005 const char *shinit;
13006 volatile smallint state;
13007 struct jmploc jmploc;
13008 struct stackmark smark;
13010 /* Initialize global data */
13014 #if ENABLE_ASH_ALIAS
13020 monitor(4, etext, profile_buf, sizeof(profile_buf), 50);
13023 #if ENABLE_FEATURE_EDITING
13024 line_input_state = new_line_input_t(FOR_SHELL | WITH_PATH_LOOKUP);
13027 if (setjmp(jmploc.loc)) {
13033 e = exception_type;
13037 if (e == EXEXIT || s == 0 || iflag == 0 || shlvl)
13040 outcslow('\n', stderr);
13042 popstackmark(&smark);
13043 FORCE_INT_ON; /* enable interrupts */
13052 exception_handler = &jmploc;
13055 TRACE(("Shell args: "));
13056 trace_puts_args(argv);
13058 rootpid = getpid();
13061 setstackmark(&smark);
13064 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
13066 const char *hp = lookupvar("HISTFILE");
13069 hp = lookupvar("HOME");
13071 char *defhp = concat_path_file(hp, ".ash_history");
13072 setvar("HISTFILE", defhp, 0);
13078 if (/* argv[0] && */ argv[0][0] == '-')
13082 read_profile("/etc/profile");
13085 read_profile(".profile");
13091 getuid() == geteuid() && getgid() == getegid() &&
13095 shinit = lookupvar("ENV");
13096 if (shinit != NULL && *shinit != '\0') {
13097 read_profile(shinit);
13103 /* evalstring pushes parsefile stack.
13104 * Ensure we don't falsely claim that 0 (stdin)
13105 * is one of stacked source fds.
13106 * Testcase: ash -c 'exec 1>&0' must not complain. */
13107 // if (!sflag) g_parsefile->pf_fd = -1;
13108 // ^^ not necessary since now we special-case fd 0
13109 // in is_hidden_fd() to not be considered "hidden fd"
13110 evalstring(minusc, 0);
13113 if (sflag || minusc == NULL) {
13114 #if defined MAX_HISTORY && MAX_HISTORY > 0 && ENABLE_FEATURE_EDITING_SAVEHISTORY
13116 const char *hp = lookupvar("HISTFILE");
13118 line_input_state->hist_file = hp;
13121 state4: /* XXX ??? - why isn't this before the "if" statement */
13129 extern void _mcleanup(void);
13139 * Copyright (c) 1989, 1991, 1993, 1994
13140 * The Regents of the University of California. All rights reserved.
13142 * This code is derived from software contributed to Berkeley by
13143 * Kenneth Almquist.
13145 * Redistribution and use in source and binary forms, with or without
13146 * modification, are permitted provided that the following conditions
13148 * 1. Redistributions of source code must retain the above copyright
13149 * notice, this list of conditions and the following disclaimer.
13150 * 2. Redistributions in binary form must reproduce the above copyright
13151 * notice, this list of conditions and the following disclaimer in the
13152 * documentation and/or other materials provided with the distribution.
13153 * 3. Neither the name of the University nor the names of its contributors
13154 * may be used to endorse or promote products derived from this software
13155 * without specific prior written permission.
13157 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
13158 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
13159 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
13160 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
13161 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
13162 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
13163 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
13164 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
13165 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
13166 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF