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"
46 #if ENABLE_SH_MATH_SUPPORT
49 #if ENABLE_ASH_RANDOM_SUPPORT
52 # define CLEAR_RANDOM_T(rnd) ((void)0)
55 #include "NUM_APPLETS.h"
57 /* STANDALONE does not make sense, and won't compile */
58 # undef CONFIG_FEATURE_SH_STANDALONE
59 # undef ENABLE_FEATURE_SH_STANDALONE
60 # undef IF_FEATURE_SH_STANDALONE
61 # undef IF_NOT_FEATURE_SH_STANDALONE
62 # define ENABLE_FEATURE_SH_STANDALONE 0
63 # define IF_FEATURE_SH_STANDALONE(...)
64 # define IF_NOT_FEATURE_SH_STANDALONE(...) __VA_ARGS__
68 # define PIPE_BUF 4096 /* amount of buffering in a pipe */
72 # error "Do not even bother, ash will not run on NOMMU machine"
75 //applet:IF_ASH(APPLET(ash, BB_DIR_BIN, BB_SUID_DROP))
76 //applet:IF_FEATURE_SH_IS_ASH(APPLET_ODDNAME(sh, ash, BB_DIR_BIN, BB_SUID_DROP, sh))
77 //applet:IF_FEATURE_BASH_IS_ASH(APPLET_ODDNAME(bash, ash, BB_DIR_BIN, BB_SUID_DROP, bash))
79 //kbuild:lib-$(CONFIG_ASH) += ash.o ash_ptr_hack.o shell_common.o
80 //kbuild:lib-$(CONFIG_ASH_RANDOM_SUPPORT) += random.o
85 //config: depends on !NOMMU
87 //config: Tha 'ash' shell adds about 60k in the default configuration and is
88 //config: the most complete and most pedantically correct shell included with
89 //config: busybox. This shell is actually a derivative of the Debian 'dash'
90 //config: shell (by Herbert Xu), which was created by porting the 'ash' shell
91 //config: (written by Kenneth Almquist) from NetBSD.
93 //config:config ASH_BASH_COMPAT
94 //config: bool "bash-compatible extensions"
96 //config: depends on ASH
98 //config: Enable bash-compatible extensions.
100 //config:config ASH_IDLE_TIMEOUT
101 //config: bool "Idle timeout variable"
103 //config: depends on ASH
105 //config: Enables bash-like auto-logout after $TMOUT seconds of idle time.
107 //config:config ASH_JOB_CONTROL
108 //config: bool "Job control"
110 //config: depends on ASH
112 //config: Enable job control in the ash shell.
114 //config:config ASH_ALIAS
115 //config: bool "Alias support"
117 //config: depends on ASH
119 //config: Enable alias support in the ash shell.
121 //config:config ASH_GETOPTS
122 //config: bool "Builtin getopt to parse positional parameters"
124 //config: depends on ASH
126 //config: Enable support for getopts builtin in ash.
128 //config:config ASH_BUILTIN_ECHO
129 //config: bool "Builtin version of 'echo'"
131 //config: depends on ASH
133 //config: Enable support for echo builtin in ash.
135 //config:config ASH_BUILTIN_PRINTF
136 //config: bool "Builtin version of 'printf'"
138 //config: depends on ASH
140 //config: Enable support for printf builtin in ash.
142 //config:config ASH_BUILTIN_TEST
143 //config: bool "Builtin version of 'test'"
145 //config: depends on ASH
147 //config: Enable support for test builtin in ash.
149 //config:config ASH_CMDCMD
150 //config: bool "'command' command to override shell builtins"
152 //config: depends on ASH
154 //config: Enable support for the ash 'command' builtin, which allows
155 //config: you to run the specified command with the specified arguments,
156 //config: even when there is an ash builtin command with the same name.
158 //config:config ASH_MAIL
159 //config: bool "Check for new mail on interactive shells"
161 //config: depends on ASH
163 //config: Enable "check for new mail" function in the ash shell.
165 //config:config ASH_OPTIMIZE_FOR_SIZE
166 //config: bool "Optimize for size instead of speed"
168 //config: depends on ASH
170 //config: Compile ash for reduced size at the price of speed.
172 //config:config ASH_RANDOM_SUPPORT
173 //config: bool "Pseudorandom generator and $RANDOM variable"
175 //config: depends on ASH
177 //config: Enable pseudorandom generator and dynamic variable "$RANDOM".
178 //config: Each read of "$RANDOM" will generate a new pseudorandom value.
179 //config: You can reset the generator by using a specified start value.
180 //config: After "unset RANDOM" the generator will switch off and this
181 //config: variable will no longer have special treatment.
183 //config:config ASH_EXPAND_PRMT
184 //config: bool "Expand prompt string"
186 //config: depends on ASH
188 //config: "PS#" may contain volatile content, such as backquote commands.
189 //config: This option recreates the prompt string from the environment
190 //config: variable each time it is displayed.
193 //usage:#define ash_trivial_usage NOUSAGE_STR
194 //usage:#define ash_full_usage ""
195 //usage:#define sh_trivial_usage NOUSAGE_STR
196 //usage:#define sh_full_usage ""
197 //usage:#define bash_trivial_usage NOUSAGE_STR
198 //usage:#define bash_full_usage ""
201 /* ============ Hash table sizes. Configurable. */
205 #define CMDTABLESIZE 31 /* should be prime */
208 /* ============ Shell options */
210 static const char *const optletters_optnames[] = {
225 #if ENABLE_ASH_BASH_COMPAT
234 #define optletters(n) optletters_optnames[n][0]
235 #define optnames(n) (optletters_optnames[n] + 1)
237 enum { NOPTS = ARRAY_SIZE(optletters_optnames) };
240 /* ============ Misc data */
242 #define msg_illnum "Illegal number: %s"
245 * We enclose jmp_buf in a structure so that we can declare pointers to
246 * jump locations. The global variable handler contains the location to
247 * jump to when an exception occurs, and the global variable exception_type
248 * contains a code identifying the exception. To implement nested
249 * exception handlers, the user should save the value of handler on entry
250 * to an inner scope, set handler to point to a jmploc structure for the
251 * inner scope, and restore handler on exit from the scope.
257 struct globals_misc {
258 /* pid of main shell */
260 /* shell level: 0 for the main shell, 1 for its children, and so on */
262 #define rootshell (!shlvl)
263 char *minusc; /* argument to -c option */
265 char *curdir; // = nullstr; /* current working directory */
266 char *physdir; // = nullstr; /* physical working directory */
268 char *arg0; /* value of $0 */
270 struct jmploc *exception_handler;
272 volatile int suppress_int; /* counter */
273 volatile /*sig_atomic_t*/ smallint pending_int; /* 1 = got SIGINT */
274 /* last pending signal */
275 volatile /*sig_atomic_t*/ smallint pending_sig;
276 smallint exception_type; /* kind of exception (0..5) */
278 #define EXINT 0 /* SIGINT received */
279 #define EXERROR 1 /* a generic error */
280 #define EXSHELLPROC 2 /* execute a shell procedure */
281 #define EXEXEC 3 /* command execution failed */
282 #define EXEXIT 4 /* exit the shell */
283 #define EXSIG 5 /* trapped signal in wait(1) */
286 char nullstr[1]; /* zero length string */
289 #define eflag optlist[0]
290 #define fflag optlist[1]
291 #define Iflag optlist[2]
292 #define iflag optlist[3]
293 #define mflag optlist[4]
294 #define nflag optlist[5]
295 #define sflag optlist[6]
296 #define xflag optlist[7]
297 #define vflag optlist[8]
298 #define Cflag optlist[9]
299 #define aflag optlist[10]
300 #define bflag optlist[11]
301 #define uflag optlist[12]
302 #define viflag optlist[13]
303 #if ENABLE_ASH_BASH_COMPAT
304 # define pipefail optlist[14]
309 # define nolog optlist[14 + ENABLE_ASH_BASH_COMPAT]
310 # define debug optlist[15 + ENABLE_ASH_BASH_COMPAT]
313 /* trap handler commands */
315 * Sigmode records the current value of the signal handlers for the various
316 * modes. A value of zero means that the current handler is not known.
317 * S_HARD_IGN indicates that the signal was ignored on entry to the shell.
319 char sigmode[NSIG - 1];
320 #define S_DFL 1 /* default signal handling (SIG_DFL) */
321 #define S_CATCH 2 /* signal is caught */
322 #define S_IGN 3 /* signal is ignored (SIG_IGN) */
323 #define S_HARD_IGN 4 /* signal is ignored permenantly */
325 /* indicates specified signal received */
326 uint8_t gotsig[NSIG - 1]; /* offset by 1: "signal" 0 is meaningless */
327 uint8_t may_have_traps; /* 0: definitely no traps are set, 1: some traps may be set */
329 char **trap_ptr; /* used only by "trap hack" */
331 /* Rarely referenced stuff */
332 #if ENABLE_ASH_RANDOM_SUPPORT
335 pid_t backgndpid; /* pid of last background process */
336 smallint job_warning; /* user was warned about stopped jobs (can be 2, 1 or 0). */
338 extern struct globals_misc *const ash_ptr_to_globals_misc;
339 #define G_misc (*ash_ptr_to_globals_misc)
340 #define rootpid (G_misc.rootpid )
341 #define shlvl (G_misc.shlvl )
342 #define minusc (G_misc.minusc )
343 #define curdir (G_misc.curdir )
344 #define physdir (G_misc.physdir )
345 #define arg0 (G_misc.arg0 )
346 #define exception_handler (G_misc.exception_handler)
347 #define exception_type (G_misc.exception_type )
348 #define suppress_int (G_misc.suppress_int )
349 #define pending_int (G_misc.pending_int )
350 #define pending_sig (G_misc.pending_sig )
351 #define isloginsh (G_misc.isloginsh )
352 #define nullstr (G_misc.nullstr )
353 #define optlist (G_misc.optlist )
354 #define sigmode (G_misc.sigmode )
355 #define gotsig (G_misc.gotsig )
356 #define may_have_traps (G_misc.may_have_traps )
357 #define trap (G_misc.trap )
358 #define trap_ptr (G_misc.trap_ptr )
359 #define random_gen (G_misc.random_gen )
360 #define backgndpid (G_misc.backgndpid )
361 #define job_warning (G_misc.job_warning)
362 #define INIT_G_misc() do { \
363 (*(struct globals_misc**)&ash_ptr_to_globals_misc) = xzalloc(sizeof(G_misc)); \
371 /* ============ DEBUG */
373 static void trace_printf(const char *fmt, ...);
374 static void trace_vprintf(const char *fmt, va_list va);
375 # define TRACE(param) trace_printf param
376 # define TRACEV(param) trace_vprintf param
377 # define close(fd) do { \
379 if (close(dfd) < 0) \
380 bb_error_msg("bug on %d: closing %d(0x%x)", \
381 __LINE__, dfd, dfd); \
384 # define TRACE(param)
385 # define TRACEV(param)
389 /* ============ Utility functions */
390 #define xbarrier() do { __asm__ __volatile__ ("": : :"memory"); } while (0)
392 static int isdigit_str9(const char *str)
394 int maxlen = 9 + 1; /* max 9 digits: 999999999 */
395 while (--maxlen && isdigit(*str))
397 return (*str == '\0');
400 static const char *var_end(const char *var)
409 /* ============ Interrupts / exceptions */
411 static void exitshell(void) NORETURN;
414 * These macros allow the user to suspend the handling of interrupt signals
415 * over a period of time. This is similar to SIGHOLD or to sigblock, but
416 * much more efficient and portable. (But hacking the kernel is so much
417 * more fun than worrying about efficiency and portability. :-))
419 #define INT_OFF do { \
425 * Called to raise an exception. Since C doesn't include exceptions, we
426 * just do a longjmp to the exception handler. The type of exception is
427 * stored in the global variable "exception_type".
429 static void raise_exception(int) NORETURN;
431 raise_exception(int e)
434 if (exception_handler == NULL)
439 longjmp(exception_handler->loc, 1);
442 #define raise_exception(e) do { \
443 TRACE(("raising exception %d on line %d\n", (e), __LINE__)); \
444 raise_exception(e); \
449 * Called from trap.c when a SIGINT is received. (If the user specifies
450 * that SIGINT is to be trapped or ignored using the trap builtin, then
451 * this routine is not called.) Suppressint is nonzero when interrupts
452 * are held using the INT_OFF macro. (The test for iflag is just
453 * defensive programming.)
455 static void raise_interrupt(void) NORETURN;
457 raise_interrupt(void)
462 /* Signal is not automatically unmasked after it is raised,
463 * do it ourself - unmask all signals */
464 sigprocmask_allsigs(SIG_UNBLOCK);
465 /* pending_sig = 0; - now done in signal_handler() */
468 if (gotsig[SIGINT - 1] && !trap[SIGINT]) {
469 if (!(rootshell && iflag)) {
470 /* Kill ourself with SIGINT */
471 signal(SIGINT, SIG_DFL);
476 raise_exception(ex_type);
480 #define raise_interrupt() do { \
481 TRACE(("raising interrupt on line %d\n", __LINE__)); \
486 static IF_ASH_OPTIMIZE_FOR_SIZE(inline) void
490 if (--suppress_int == 0 && pending_int) {
494 #define INT_ON int_on()
495 static IF_ASH_OPTIMIZE_FOR_SIZE(inline) void
503 #define FORCE_INT_ON force_int_on()
505 #define SAVE_INT(v) ((v) = suppress_int)
507 #define RESTORE_INT(v) do { \
509 suppress_int = (v); \
510 if (suppress_int == 0 && pending_int) \
515 /* ============ Stdout/stderr output */
518 outstr(const char *p, FILE *file)
526 flush_stdout_stderr(void)
534 outcslow(int c, FILE *dest)
542 static int out1fmt(const char *, ...) __attribute__((__format__(__printf__,1,2)));
544 out1fmt(const char *fmt, ...)
551 r = vprintf(fmt, ap);
557 static int fmtstr(char *, size_t, const char *, ...) __attribute__((__format__(__printf__,3,4)));
559 fmtstr(char *outbuf, size_t length, const char *fmt, ...)
566 ret = vsnprintf(outbuf, length, fmt, ap);
573 out1str(const char *p)
579 out2str(const char *p)
582 flush_stdout_stderr();
586 /* ============ Parser structures */
588 /* control characters in argument strings */
589 #define CTL_FIRST CTLESC
590 #define CTLESC ((unsigned char)'\201') /* escape next character */
591 #define CTLVAR ((unsigned char)'\202') /* variable defn */
592 #define CTLENDVAR ((unsigned char)'\203')
593 #define CTLBACKQ ((unsigned char)'\204')
594 #define CTLQUOTE 01 /* ored with CTLBACKQ code if in quotes */
595 /* CTLBACKQ | CTLQUOTE == '\205' */
596 #define CTLARI ((unsigned char)'\206') /* arithmetic expression */
597 #define CTLENDARI ((unsigned char)'\207')
598 #define CTLQUOTEMARK ((unsigned char)'\210')
599 #define CTL_LAST CTLQUOTEMARK
601 /* variable substitution byte (follows CTLVAR) */
602 #define VSTYPE 0x0f /* type of variable substitution */
603 #define VSNUL 0x10 /* colon--treat the empty string as unset */
604 #define VSQUOTE 0x80 /* inside double quotes--suppress splitting */
606 /* values of VSTYPE field */
607 #define VSNORMAL 0x1 /* normal variable: $var or ${var} */
608 #define VSMINUS 0x2 /* ${var-text} */
609 #define VSPLUS 0x3 /* ${var+text} */
610 #define VSQUESTION 0x4 /* ${var?message} */
611 #define VSASSIGN 0x5 /* ${var=text} */
612 #define VSTRIMRIGHT 0x6 /* ${var%pattern} */
613 #define VSTRIMRIGHTMAX 0x7 /* ${var%%pattern} */
614 #define VSTRIMLEFT 0x8 /* ${var#pattern} */
615 #define VSTRIMLEFTMAX 0x9 /* ${var##pattern} */
616 #define VSLENGTH 0xa /* ${#var} */
617 #if ENABLE_ASH_BASH_COMPAT
618 #define VSSUBSTR 0xc /* ${var:position:length} */
619 #define VSREPLACE 0xd /* ${var/pattern/replacement} */
620 #define VSREPLACEALL 0xe /* ${var//pattern/replacement} */
623 static const char dolatstr[] ALIGN1 = {
624 CTLVAR, VSNORMAL|VSQUOTE, '@', '=', '\0'
644 #if ENABLE_ASH_BASH_COMPAT
661 smallint type; /* Nxxxx */
664 union node *redirect;
669 smallint pipe_backgnd;
670 struct nodelist *cmdlist;
676 union node *redirect;
689 union node *elsepart;
716 struct nodelist *backquote;
719 /* nfile and ndup layout must match!
720 * NTOFD (>&fdnum) uses ndup structure, but we may discover mid-flight
721 * that it is actually NTO2 (>&file), and change its type.
738 char *_unused_expfname;
757 struct nredir nredir;
758 struct nbinary nbinary;
762 struct nclist nclist;
771 * NODE_EOF is returned by parsecmd when it encounters an end of file.
772 * It must be distinct from NULL.
774 #define NODE_EOF ((union node *) -1L)
777 struct nodelist *next;
790 freefunc(struct funcnode *f)
792 if (f && --f->count < 0)
797 /* ============ Debugging output */
801 static FILE *tracefile;
804 trace_printf(const char *fmt, ...)
811 fprintf(tracefile, "%u ", (int) time(NULL));
813 fprintf(tracefile, "[%u] ", (int) getpid());
815 fprintf(tracefile, "pending s:%d i:%d(supp:%d) ", pending_sig, pending_int, suppress_int);
817 vfprintf(tracefile, fmt, va);
822 trace_vprintf(const char *fmt, va_list va)
827 fprintf(tracefile, "%u ", (int) time(NULL));
829 fprintf(tracefile, "[%u] ", (int) getpid());
831 fprintf(tracefile, "pending s:%d i:%d(supp:%d) ", pending_sig, pending_int, suppress_int);
832 vfprintf(tracefile, fmt, va);
836 trace_puts(const char *s)
844 trace_puts_quoted(char *s)
851 putc('"', tracefile);
852 for (p = s; *p; p++) {
853 switch ((unsigned char)*p) {
854 case '\n': c = 'n'; goto backslash;
855 case '\t': c = 't'; goto backslash;
856 case '\r': c = 'r'; goto backslash;
857 case '\"': c = '\"'; goto backslash;
858 case '\\': c = '\\'; goto backslash;
859 case CTLESC: c = 'e'; goto backslash;
860 case CTLVAR: c = 'v'; goto backslash;
861 case CTLVAR+CTLQUOTE: c = 'V'; goto backslash;
862 case CTLBACKQ: c = 'q'; goto backslash;
863 case CTLBACKQ+CTLQUOTE: c = 'Q'; goto backslash;
865 putc('\\', tracefile);
869 if (*p >= ' ' && *p <= '~')
872 putc('\\', tracefile);
873 putc((*p >> 6) & 03, tracefile);
874 putc((*p >> 3) & 07, tracefile);
875 putc(*p & 07, tracefile);
880 putc('"', tracefile);
884 trace_puts_args(char **ap)
891 trace_puts_quoted(*ap);
893 putc('\n', tracefile);
896 putc(' ', tracefile);
911 /* leave open because libedit might be using it */
914 strcpy(s, "./trace");
916 if (!freopen(s, "a", tracefile)) {
917 fprintf(stderr, "Can't re-open %s\n", s);
922 tracefile = fopen(s, "a");
923 if (tracefile == NULL) {
924 fprintf(stderr, "Can't open %s\n", s);
930 flags = fcntl(fileno(tracefile), F_GETFL);
932 fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND);
934 setlinebuf(tracefile);
935 fputs("\nTracing started.\n", tracefile);
939 indent(int amount, char *pfx, FILE *fp)
943 for (i = 0; i < amount; i++) {
944 if (pfx && i == amount - 1)
950 /* little circular references here... */
951 static void shtree(union node *n, int ind, char *pfx, FILE *fp);
954 sharg(union node *arg, FILE *fp)
957 struct nodelist *bqlist;
958 unsigned char subtype;
960 if (arg->type != NARG) {
961 out1fmt("<node type %d>\n", arg->type);
964 bqlist = arg->narg.backquote;
965 for (p = arg->narg.text; *p; p++) {
966 switch ((unsigned char)*p) {
975 if (subtype == VSLENGTH)
986 switch (subtype & VSTYPE) {
1012 case VSTRIMRIGHTMAX:
1019 out1fmt("<subtype %d>", subtype);
1026 case CTLBACKQ|CTLQUOTE:
1029 shtree(bqlist->n, -1, NULL, fp);
1040 shcmd(union node *cmd, FILE *fp)
1048 for (np = cmd->ncmd.args; np; np = np->narg.next) {
1054 for (np = cmd->ncmd.redirect; np; np = np->nfile.next) {
1058 switch (np->nfile.type) {
1059 case NTO: s = ">>"+1; dftfd = 1; break;
1060 case NCLOBBER: s = ">|"; dftfd = 1; break;
1061 case NAPPEND: s = ">>"; dftfd = 1; break;
1062 #if ENABLE_ASH_BASH_COMPAT
1065 case NTOFD: s = ">&"; dftfd = 1; break;
1066 case NFROM: s = "<"; break;
1067 case NFROMFD: s = "<&"; break;
1068 case NFROMTO: s = "<>"; break;
1069 default: s = "*error*"; break;
1071 if (np->nfile.fd != dftfd)
1072 fprintf(fp, "%d", np->nfile.fd);
1074 if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) {
1075 fprintf(fp, "%d", np->ndup.dupfd);
1077 sharg(np->nfile.fname, fp);
1084 shtree(union node *n, int ind, char *pfx, FILE *fp)
1086 struct nodelist *lp;
1092 indent(ind, pfx, fp);
1094 if (n == NODE_EOF) {
1109 shtree(n->nbinary.ch1, ind, NULL, fp);
1112 shtree(n->nbinary.ch2, ind, NULL, fp);
1120 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
1121 shtree(lp->n, 0, NULL, fp);
1125 if (n->npipe.pipe_backgnd)
1131 fprintf(fp, "<node type %d>", n->type);
1139 showtree(union node *n)
1141 trace_puts("showtree called\n");
1142 shtree(n, 1, NULL, stderr);
1148 /* ============ Parser data */
1151 * ash_vmsg() needs parsefile->fd, hence parsefile definition is moved up.
1154 struct strlist *next;
1161 struct strpush *prev; /* preceding string on stack */
1163 int prev_left_in_line;
1164 #if ENABLE_ASH_ALIAS
1165 struct alias *ap; /* if push was associated with an alias */
1167 char *string; /* remember the string since it may change */
1171 struct parsefile *prev; /* preceding file on stack */
1172 int linno; /* current line */
1173 int pf_fd; /* file descriptor (or -1 if string) */
1174 int left_in_line; /* number of chars left in this line */
1175 int left_in_buffer; /* number of chars left in this buffer past the line */
1176 char *next_to_pgetc; /* next char in buffer */
1177 char *buf; /* input buffer */
1178 struct strpush *strpush; /* for pushing strings at this level */
1179 struct strpush basestrpush; /* so pushing one is fast */
1182 static struct parsefile basepf; /* top level input file */
1183 static struct parsefile *g_parsefile = &basepf; /* current input file */
1184 static int startlinno; /* line # where last token started */
1185 static char *commandname; /* currently executing command */
1186 static struct strlist *cmdenviron; /* environment for builtin command */
1187 static uint8_t exitstatus; /* exit status of last command */
1190 /* ============ Message printing */
1193 ash_vmsg(const char *msg, va_list ap)
1195 fprintf(stderr, "%s: ", arg0);
1197 if (strcmp(arg0, commandname))
1198 fprintf(stderr, "%s: ", commandname);
1199 if (!iflag || g_parsefile->pf_fd > 0)
1200 fprintf(stderr, "line %d: ", startlinno);
1202 vfprintf(stderr, msg, ap);
1203 outcslow('\n', stderr);
1207 * Exverror is called to raise the error exception. If the second argument
1208 * is not NULL then error prints an error message using printf style
1209 * formatting. It then raises the error exception.
1211 static void ash_vmsg_and_raise(int, const char *, va_list) NORETURN;
1213 ash_vmsg_and_raise(int cond, const char *msg, va_list ap)
1217 TRACE(("ash_vmsg_and_raise(%d, \"", cond));
1219 TRACE(("\") pid=%d\n", getpid()));
1221 TRACE(("ash_vmsg_and_raise(%d, NULL) pid=%d\n", cond, getpid()));
1226 flush_stdout_stderr();
1227 raise_exception(cond);
1231 static void ash_msg_and_raise_error(const char *, ...) NORETURN;
1233 ash_msg_and_raise_error(const char *msg, ...)
1238 ash_vmsg_and_raise(EXERROR, msg, ap);
1243 static void raise_error_syntax(const char *) NORETURN;
1245 raise_error_syntax(const char *msg)
1247 ash_msg_and_raise_error("syntax error: %s", msg);
1251 static void ash_msg_and_raise(int, const char *, ...) NORETURN;
1253 ash_msg_and_raise(int cond, const char *msg, ...)
1258 ash_vmsg_and_raise(cond, msg, ap);
1264 * error/warning routines for external builtins
1267 ash_msg(const char *fmt, ...)
1277 * Return a string describing an error. The returned string may be a
1278 * pointer to a static buffer that will be overwritten on the next call.
1279 * Action describes the operation that got the error.
1282 errmsg(int e, const char *em)
1284 if (e == ENOENT || e == ENOTDIR) {
1291 /* ============ Memory allocation */
1294 /* I consider these wrappers nearly useless:
1295 * ok, they return you to nearest exception handler, but
1296 * how much memory do you leak in the process, making
1297 * memory starvation worse?
1300 ckrealloc(void * p, size_t nbytes)
1302 p = realloc(p, nbytes);
1304 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1309 ckmalloc(size_t nbytes)
1311 return ckrealloc(NULL, nbytes);
1315 ckzalloc(size_t nbytes)
1317 return memset(ckmalloc(nbytes), 0, nbytes);
1321 ckstrdup(const char *s)
1323 char *p = strdup(s);
1325 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1329 /* Using bbox equivalents. They exit if out of memory */
1330 # define ckrealloc xrealloc
1331 # define ckmalloc xmalloc
1332 # define ckzalloc xzalloc
1333 # define ckstrdup xstrdup
1337 * It appears that grabstackstr() will barf with such alignments
1338 * because stalloc() will return a string allocated in a new stackblock.
1340 #define SHELL_ALIGN(nbytes) (((nbytes) + SHELL_SIZE) & ~SHELL_SIZE)
1342 /* Most machines require the value returned from malloc to be aligned
1343 * in some way. The following macro will get this right
1344 * on many machines. */
1345 SHELL_SIZE = sizeof(union { int i; char *cp; double d; }) - 1,
1346 /* Minimum size of a block */
1347 MINSIZE = SHELL_ALIGN(504),
1350 struct stack_block {
1351 struct stack_block *prev;
1352 char space[MINSIZE];
1356 struct stack_block *stackp;
1359 struct stackmark *marknext;
1363 struct globals_memstack {
1364 struct stack_block *g_stackp; // = &stackbase;
1365 struct stackmark *markp;
1366 char *g_stacknxt; // = stackbase.space;
1367 char *sstrend; // = stackbase.space + MINSIZE;
1368 size_t g_stacknleft; // = MINSIZE;
1369 int herefd; // = -1;
1370 struct stack_block stackbase;
1372 extern struct globals_memstack *const ash_ptr_to_globals_memstack;
1373 #define G_memstack (*ash_ptr_to_globals_memstack)
1374 #define g_stackp (G_memstack.g_stackp )
1375 #define markp (G_memstack.markp )
1376 #define g_stacknxt (G_memstack.g_stacknxt )
1377 #define sstrend (G_memstack.sstrend )
1378 #define g_stacknleft (G_memstack.g_stacknleft)
1379 #define herefd (G_memstack.herefd )
1380 #define stackbase (G_memstack.stackbase )
1381 #define INIT_G_memstack() do { \
1382 (*(struct globals_memstack**)&ash_ptr_to_globals_memstack) = xzalloc(sizeof(G_memstack)); \
1384 g_stackp = &stackbase; \
1385 g_stacknxt = stackbase.space; \
1386 g_stacknleft = MINSIZE; \
1387 sstrend = stackbase.space + MINSIZE; \
1392 #define stackblock() ((void *)g_stacknxt)
1393 #define stackblocksize() g_stacknleft
1396 * Parse trees for commands are allocated in lifo order, so we use a stack
1397 * to make this more efficient, and also to avoid all sorts of exception
1398 * handling code to handle interrupts in the middle of a parse.
1400 * The size 504 was chosen because the Ultrix malloc handles that size
1404 stalloc(size_t nbytes)
1409 aligned = SHELL_ALIGN(nbytes);
1410 if (aligned > g_stacknleft) {
1413 struct stack_block *sp;
1415 blocksize = aligned;
1416 if (blocksize < MINSIZE)
1417 blocksize = MINSIZE;
1418 len = sizeof(struct stack_block) - MINSIZE + blocksize;
1419 if (len < blocksize)
1420 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1423 sp->prev = g_stackp;
1424 g_stacknxt = sp->space;
1425 g_stacknleft = blocksize;
1426 sstrend = g_stacknxt + blocksize;
1431 g_stacknxt += aligned;
1432 g_stacknleft -= aligned;
1437 stzalloc(size_t nbytes)
1439 return memset(stalloc(nbytes), 0, nbytes);
1446 if (!p || (g_stacknxt < (char *)p) || ((char *)p < g_stackp->space)) {
1447 write(STDERR_FILENO, "stunalloc\n", 10);
1451 g_stacknleft += g_stacknxt - (char *)p;
1456 * Like strdup but works with the ash stack.
1459 ststrdup(const char *p)
1461 size_t len = strlen(p) + 1;
1462 return memcpy(stalloc(len), p, len);
1466 setstackmark(struct stackmark *mark)
1468 mark->stackp = g_stackp;
1469 mark->stacknxt = g_stacknxt;
1470 mark->stacknleft = g_stacknleft;
1471 mark->marknext = markp;
1476 popstackmark(struct stackmark *mark)
1478 struct stack_block *sp;
1484 markp = mark->marknext;
1485 while (g_stackp != mark->stackp) {
1487 g_stackp = sp->prev;
1490 g_stacknxt = mark->stacknxt;
1491 g_stacknleft = mark->stacknleft;
1492 sstrend = mark->stacknxt + mark->stacknleft;
1497 * When the parser reads in a string, it wants to stick the string on the
1498 * stack and only adjust the stack pointer when it knows how big the
1499 * string is. Stackblock (defined in stack.h) returns a pointer to a block
1500 * of space on top of the stack and stackblocklen returns the length of
1501 * this block. Growstackblock will grow this space by at least one byte,
1502 * possibly moving it (like realloc). Grabstackblock actually allocates the
1503 * part of the block that has been used.
1506 growstackblock(void)
1510 newlen = g_stacknleft * 2;
1511 if (newlen < g_stacknleft)
1512 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1516 if (g_stacknxt == g_stackp->space && g_stackp != &stackbase) {
1517 struct stack_block *oldstackp;
1518 struct stackmark *xmark;
1519 struct stack_block *sp;
1520 struct stack_block *prevstackp;
1524 oldstackp = g_stackp;
1526 prevstackp = sp->prev;
1527 grosslen = newlen + sizeof(struct stack_block) - MINSIZE;
1528 sp = ckrealloc(sp, grosslen);
1529 sp->prev = prevstackp;
1531 g_stacknxt = sp->space;
1532 g_stacknleft = newlen;
1533 sstrend = sp->space + newlen;
1536 * Stack marks pointing to the start of the old block
1537 * must be relocated to point to the new block
1540 while (xmark != NULL && xmark->stackp == oldstackp) {
1541 xmark->stackp = g_stackp;
1542 xmark->stacknxt = g_stacknxt;
1543 xmark->stacknleft = g_stacknleft;
1544 xmark = xmark->marknext;
1548 char *oldspace = g_stacknxt;
1549 size_t oldlen = g_stacknleft;
1550 char *p = stalloc(newlen);
1552 /* free the space we just allocated */
1553 g_stacknxt = memcpy(p, oldspace, oldlen);
1554 g_stacknleft += newlen;
1559 grabstackblock(size_t len)
1561 len = SHELL_ALIGN(len);
1563 g_stacknleft -= len;
1567 * The following routines are somewhat easier to use than the above.
1568 * The user declares a variable of type STACKSTR, which may be declared
1569 * to be a register. The macro STARTSTACKSTR initializes things. Then
1570 * the user uses the macro STPUTC to add characters to the string. In
1571 * effect, STPUTC(c, p) is the same as *p++ = c except that the stack is
1572 * grown as necessary. When the user is done, she can just leave the
1573 * string there and refer to it using stackblock(). Or she can allocate
1574 * the space for it using grabstackstr(). If it is necessary to allow
1575 * someone else to use the stack temporarily and then continue to grow
1576 * the string, the user should use grabstack to allocate the space, and
1577 * then call ungrabstr(p) to return to the previous mode of operation.
1579 * USTPUTC is like STPUTC except that it doesn't check for overflow.
1580 * CHECKSTACKSPACE can be called before USTPUTC to ensure that there
1581 * is space for at least one character.
1586 size_t len = stackblocksize();
1587 if (herefd >= 0 && len >= 1024) {
1588 full_write(herefd, stackblock(), len);
1589 return stackblock();
1592 return (char *)stackblock() + len;
1596 * Called from CHECKSTRSPACE.
1599 makestrspace(size_t newlen, char *p)
1601 size_t len = p - g_stacknxt;
1602 size_t size = stackblocksize();
1607 size = stackblocksize();
1609 if (nleft >= newlen)
1613 return (char *)stackblock() + len;
1617 stack_nputstr(const char *s, size_t n, char *p)
1619 p = makestrspace(n, p);
1620 p = (char *)memcpy(p, s, n) + n;
1625 stack_putstr(const char *s, char *p)
1627 return stack_nputstr(s, strlen(s), p);
1631 _STPUTC(int c, char *p)
1639 #define STARTSTACKSTR(p) ((p) = stackblock())
1640 #define STPUTC(c, p) ((p) = _STPUTC((c), (p)))
1641 #define CHECKSTRSPACE(n, p) do { \
1644 size_t m = sstrend - q; \
1646 (p) = makestrspace(l, q); \
1648 #define USTPUTC(c, p) (*(p)++ = (c))
1649 #define STACKSTRNUL(p) do { \
1650 if ((p) == sstrend) \
1651 (p) = growstackstr(); \
1654 #define STUNPUTC(p) (--(p))
1655 #define STTOPC(p) ((p)[-1])
1656 #define STADJUST(amount, p) ((p) += (amount))
1658 #define grabstackstr(p) stalloc((char *)(p) - (char *)stackblock())
1659 #define ungrabstackstr(s, p) stunalloc(s)
1660 #define stackstrend() ((void *)sstrend)
1663 /* ============ String helpers */
1666 * prefix -- see if pfx is a prefix of string.
1669 prefix(const char *string, const char *pfx)
1672 if (*pfx++ != *string++)
1675 return (char *) string;
1679 * Check for a valid number. This should be elsewhere.
1682 is_number(const char *p)
1687 } while (*++p != '\0');
1692 * Convert a string of digits to an integer, printing an error message on
1696 number(const char *s)
1699 ash_msg_and_raise_error(msg_illnum, s);
1704 * Produce a possibly single quoted string suitable as input to the shell.
1705 * The return string is allocated on the stack.
1708 single_quote(const char *s)
1718 len = strchrnul(s, '\'') - s;
1720 q = p = makestrspace(len + 3, p);
1723 q = (char *)memcpy(q, s, len) + len;
1732 do len++; while (*++s == '\'');
1734 q = p = makestrspace(len + 3, p);
1737 q = (char *)memcpy(q, s - len, len) + len;
1745 return stackblock();
1749 /* ============ nextopt */
1751 static char **argptr; /* argument list for builtin commands */
1752 static char *optionarg; /* set by nextopt (like getopt) */
1753 static char *optptr; /* used by nextopt */
1756 * XXX - should get rid of. Have all builtins use getopt(3).
1757 * The library getopt must have the BSD extension static variable
1758 * "optreset", otherwise it can't be used within the shell safely.
1760 * Standard option processing (a la getopt) for builtin routines.
1761 * The only argument that is passed to nextopt is the option string;
1762 * the other arguments are unnecessary. It returns the character,
1763 * or '\0' on end of input.
1766 nextopt(const char *optstring)
1773 if (p == NULL || *p == '\0') {
1774 /* We ate entire "-param", take next one */
1780 if (*++p == '\0') /* just "-" ? */
1783 if (LONE_DASH(p)) /* "--" ? */
1785 /* p => next "-param" */
1787 /* p => some option char in the middle of a "-param" */
1789 for (q = optstring; *q != c;) {
1791 ash_msg_and_raise_error("illegal option -%c", c);
1799 ash_msg_and_raise_error("no arg for -%c option", c);
1809 /* ============ Shell variables */
1812 * The parsefile structure pointed to by the global variable parsefile
1813 * contains information about the current file being read.
1816 int nparam; /* # of positional parameters (without $0) */
1817 #if ENABLE_ASH_GETOPTS
1818 int optind; /* next parameter to be processed by getopts */
1819 int optoff; /* used by getopts */
1821 unsigned char malloced; /* if parameter list dynamically allocated */
1822 char **p; /* parameter list */
1826 * Free the list of positional parameters.
1829 freeparam(volatile struct shparam *param)
1831 if (param->malloced) {
1833 ap = ap1 = param->p;
1840 #if ENABLE_ASH_GETOPTS
1841 static void FAST_FUNC getoptsreset(const char *value);
1845 struct var *next; /* next entry in hash list */
1846 int flags; /* flags are defined above */
1847 const char *var_text; /* name=value */
1848 void (*var_func)(const char *) FAST_FUNC; /* function to be called when */
1849 /* the variable gets set/unset */
1853 struct localvar *next; /* next local variable in list */
1854 struct var *vp; /* the variable that was made local */
1855 int flags; /* saved flags */
1856 const char *text; /* saved text */
1860 #define VEXPORT 0x01 /* variable is exported */
1861 #define VREADONLY 0x02 /* variable cannot be modified */
1862 #define VSTRFIXED 0x04 /* variable struct is statically allocated */
1863 #define VTEXTFIXED 0x08 /* text is statically allocated */
1864 #define VSTACK 0x10 /* text is allocated on the stack */
1865 #define VUNSET 0x20 /* the variable is not set */
1866 #define VNOFUNC 0x40 /* don't call the callback function */
1867 #define VNOSET 0x80 /* do not set variable - just readonly test */
1868 #define VNOSAVE 0x100 /* when text is on the heap before setvareq */
1869 #if ENABLE_ASH_RANDOM_SUPPORT
1870 # define VDYNAMIC 0x200 /* dynamic variable */
1876 /* Need to be before varinit_data[] */
1877 #if ENABLE_LOCALE_SUPPORT
1878 static void FAST_FUNC
1879 change_lc_all(const char *value)
1881 if (value && *value != '\0')
1882 setlocale(LC_ALL, value);
1884 static void FAST_FUNC
1885 change_lc_ctype(const char *value)
1887 if (value && *value != '\0')
1888 setlocale(LC_CTYPE, value);
1892 static void chkmail(void);
1893 static void changemail(const char *var_value) FAST_FUNC;
1895 # define chkmail() ((void)0)
1897 static void changepath(const char *) FAST_FUNC;
1898 #if ENABLE_ASH_RANDOM_SUPPORT
1899 static void change_random(const char *) FAST_FUNC;
1902 static const struct {
1904 const char *var_text;
1905 void (*var_func)(const char *) FAST_FUNC;
1906 } varinit_data[] = {
1907 { VSTRFIXED|VTEXTFIXED , defifsvar , NULL },
1909 { VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL" , changemail },
1910 { VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH" , changemail },
1912 { VSTRFIXED|VTEXTFIXED , bb_PATH_root_path, changepath },
1913 { VSTRFIXED|VTEXTFIXED , "PS1=$ " , NULL },
1914 { VSTRFIXED|VTEXTFIXED , "PS2=> " , NULL },
1915 { VSTRFIXED|VTEXTFIXED , "PS4=+ " , NULL },
1916 #if ENABLE_ASH_GETOPTS
1917 { VSTRFIXED|VTEXTFIXED , "OPTIND=1" , getoptsreset },
1919 #if ENABLE_ASH_RANDOM_SUPPORT
1920 { VSTRFIXED|VTEXTFIXED|VUNSET|VDYNAMIC, "RANDOM", change_random },
1922 #if ENABLE_LOCALE_SUPPORT
1923 { VSTRFIXED|VTEXTFIXED|VUNSET, "LC_ALL" , change_lc_all },
1924 { VSTRFIXED|VTEXTFIXED|VUNSET, "LC_CTYPE" , change_lc_ctype },
1926 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
1927 { VSTRFIXED|VTEXTFIXED|VUNSET, "HISTFILE" , NULL },
1933 struct globals_var {
1934 struct shparam shellparam; /* $@ current positional parameters */
1935 struct redirtab *redirlist;
1937 int preverrout_fd; /* save fd2 before print debug if xflag is set. */
1938 struct var *vartab[VTABSIZE];
1939 struct var varinit[ARRAY_SIZE(varinit_data)];
1941 extern struct globals_var *const ash_ptr_to_globals_var;
1942 #define G_var (*ash_ptr_to_globals_var)
1943 #define shellparam (G_var.shellparam )
1944 //#define redirlist (G_var.redirlist )
1945 #define g_nullredirs (G_var.g_nullredirs )
1946 #define preverrout_fd (G_var.preverrout_fd)
1947 #define vartab (G_var.vartab )
1948 #define varinit (G_var.varinit )
1949 #define INIT_G_var() do { \
1951 (*(struct globals_var**)&ash_ptr_to_globals_var) = xzalloc(sizeof(G_var)); \
1953 for (i = 0; i < ARRAY_SIZE(varinit_data); i++) { \
1954 varinit[i].flags = varinit_data[i].flags; \
1955 varinit[i].var_text = varinit_data[i].var_text; \
1956 varinit[i].var_func = varinit_data[i].var_func; \
1960 #define vifs varinit[0]
1962 # define vmail (&vifs)[1]
1963 # define vmpath (&vmail)[1]
1964 # define vpath (&vmpath)[1]
1966 # define vpath (&vifs)[1]
1968 #define vps1 (&vpath)[1]
1969 #define vps2 (&vps1)[1]
1970 #define vps4 (&vps2)[1]
1971 #if ENABLE_ASH_GETOPTS
1972 # define voptind (&vps4)[1]
1973 # if ENABLE_ASH_RANDOM_SUPPORT
1974 # define vrandom (&voptind)[1]
1977 # if ENABLE_ASH_RANDOM_SUPPORT
1978 # define vrandom (&vps4)[1]
1983 * The following macros access the values of the above variables.
1984 * They have to skip over the name. They return the null string
1985 * for unset variables.
1987 #define ifsval() (vifs.var_text + 4)
1988 #define ifsset() ((vifs.flags & VUNSET) == 0)
1990 # define mailval() (vmail.var_text + 5)
1991 # define mpathval() (vmpath.var_text + 9)
1992 # define mpathset() ((vmpath.flags & VUNSET) == 0)
1994 #define pathval() (vpath.var_text + 5)
1995 #define ps1val() (vps1.var_text + 4)
1996 #define ps2val() (vps2.var_text + 4)
1997 #define ps4val() (vps4.var_text + 4)
1998 #if ENABLE_ASH_GETOPTS
1999 # define optindval() (voptind.var_text + 7)
2002 #if ENABLE_ASH_GETOPTS
2003 static void FAST_FUNC
2004 getoptsreset(const char *value)
2006 shellparam.optind = number(value);
2007 shellparam.optoff = -1;
2011 /* math.h has these, otherwise define our private copies */
2012 #if !ENABLE_SH_MATH_SUPPORT
2013 #define is_name(c) ((c) == '_' || isalpha((unsigned char)(c)))
2014 #define is_in_name(c) ((c) == '_' || isalnum((unsigned char)(c)))
2016 * Return the pointer to the first char which is not part of a legal variable name
2017 * (a letter or underscore followed by letters, underscores, and digits).
2020 endofname(const char *name)
2022 if (!is_name(*name))
2025 if (!is_in_name(*name))
2033 * Compares two strings up to the first = or '\0'. The first
2034 * string must be terminated by '='; the second may be terminated by
2035 * either '=' or '\0'.
2038 varcmp(const char *p, const char *q)
2042 while ((c = *p) == (d = *q)) {
2057 * Find the appropriate entry in the hash table from the name.
2059 static struct var **
2060 hashvar(const char *p)
2064 hashval = ((unsigned char) *p) << 4;
2065 while (*p && *p != '=')
2066 hashval += (unsigned char) *p++;
2067 return &vartab[hashval % VTABSIZE];
2071 vpcmp(const void *a, const void *b)
2073 return varcmp(*(const char **)a, *(const char **)b);
2077 * This routine initializes the builtin variables.
2087 * PS1 depends on uid
2089 #if ENABLE_FEATURE_EDITING && ENABLE_FEATURE_EDITING_FANCY_PROMPT
2090 vps1.var_text = "PS1=\\w \\$ ";
2093 vps1.var_text = "PS1=# ";
2096 end = vp + ARRAY_SIZE(varinit);
2098 vpp = hashvar(vp->var_text);
2101 } while (++vp < end);
2104 static struct var **
2105 findvar(struct var **vpp, const char *name)
2107 for (; *vpp; vpp = &(*vpp)->next) {
2108 if (varcmp((*vpp)->var_text, name) == 0) {
2116 * Find the value of a variable. Returns NULL if not set.
2118 static const char* FAST_FUNC
2119 lookupvar(const char *name)
2123 v = *findvar(hashvar(name), name);
2125 #if ENABLE_ASH_RANDOM_SUPPORT
2127 * Dynamic variables are implemented roughly the same way they are
2128 * in bash. Namely, they're "special" so long as they aren't unset.
2129 * As soon as they're unset, they're no longer dynamic, and dynamic
2130 * lookup will no longer happen at that point. -- PFM.
2132 if (v->flags & VDYNAMIC)
2135 if (!(v->flags & VUNSET))
2136 return var_end(v->var_text);
2142 * Search the environment of a builtin command.
2145 bltinlookup(const char *name)
2149 for (sp = cmdenviron; sp; sp = sp->next) {
2150 if (varcmp(sp->text, name) == 0)
2151 return var_end(sp->text);
2153 return lookupvar(name);
2157 * Same as setvar except that the variable and value are passed in
2158 * the first argument as name=value. Since the first argument will
2159 * be actually stored in the table, it should not be a string that
2161 * Called with interrupts off.
2164 setvareq(char *s, int flags)
2166 struct var *vp, **vpp;
2169 flags |= (VEXPORT & (((unsigned) (1 - aflag)) - 1));
2170 vp = *findvar(vpp, s);
2172 if ((vp->flags & (VREADONLY|VDYNAMIC)) == VREADONLY) {
2175 if (flags & VNOSAVE)
2178 ash_msg_and_raise_error("%.*s: is read only", strchrnul(n, '=') - n, n);
2184 if (vp->var_func && !(flags & VNOFUNC))
2185 vp->var_func(var_end(s));
2187 if (!(vp->flags & (VTEXTFIXED|VSTACK)))
2188 free((char*)vp->var_text);
2190 flags |= vp->flags & ~(VTEXTFIXED|VSTACK|VNOSAVE|VUNSET);
2192 /* variable s is not found */
2195 vp = ckzalloc(sizeof(*vp));
2197 /*vp->func = NULL; - ckzalloc did it */
2200 if (!(flags & (VTEXTFIXED|VSTACK|VNOSAVE)))
2207 * Set the value of a variable. The flags argument is ored with the
2208 * flags of the variable. If val is NULL, the variable is unset.
2211 setvar(const char *name, const char *val, int flags)
2219 q = endofname(name);
2220 p = strchrnul(q, '=');
2222 if (!namelen || p != q)
2223 ash_msg_and_raise_error("%.*s: bad variable name", namelen, name);
2228 vallen = strlen(val);
2232 nameeq = ckmalloc(namelen + vallen + 2);
2233 p = memcpy(nameeq, name, namelen) + namelen;
2236 p = memcpy(p, val, vallen) + vallen;
2239 setvareq(nameeq, flags | VNOSAVE);
2243 static void FAST_FUNC
2244 setvar2(const char *name, const char *val)
2246 setvar(name, val, 0);
2249 #if ENABLE_ASH_GETOPTS
2251 * Safe version of setvar, returns 1 on success 0 on failure.
2254 setvarsafe(const char *name, const char *val, int flags)
2257 volatile int saveint;
2258 struct jmploc *volatile savehandler = exception_handler;
2259 struct jmploc jmploc;
2262 if (setjmp(jmploc.loc))
2265 exception_handler = &jmploc;
2266 setvar(name, val, flags);
2269 exception_handler = savehandler;
2270 RESTORE_INT(saveint);
2276 * Unset the specified variable.
2279 unsetvar(const char *s)
2285 vpp = findvar(hashvar(s), s);
2289 int flags = vp->flags;
2292 if (flags & VREADONLY)
2294 #if ENABLE_ASH_RANDOM_SUPPORT
2295 vp->flags &= ~VDYNAMIC;
2299 if ((flags & VSTRFIXED) == 0) {
2301 if ((flags & (VTEXTFIXED|VSTACK)) == 0)
2302 free((char*)vp->var_text);
2308 vp->flags &= ~VEXPORT;
2318 * Process a linked list of variable assignments.
2321 listsetvar(struct strlist *list_set_var, int flags)
2323 struct strlist *lp = list_set_var;
2329 setvareq(lp->text, flags);
2336 * Generate a list of variables satisfying the given conditions.
2339 listvars(int on, int off, char ***end)
2350 for (vp = *vpp; vp; vp = vp->next) {
2351 if ((vp->flags & mask) == on) {
2352 if (ep == stackstrend())
2353 ep = growstackstr();
2354 *ep++ = (char*)vp->var_text;
2357 } while (++vpp < vartab + VTABSIZE);
2358 if (ep == stackstrend())
2359 ep = growstackstr();
2363 return grabstackstr(ep);
2367 /* ============ Path search helper
2369 * The variable path (passed by reference) should be set to the start
2370 * of the path before the first call; path_advance will update
2371 * this value as it proceeds. Successive calls to path_advance will return
2372 * the possible path expansions in sequence. If an option (indicated by
2373 * a percent sign) appears in the path entry then the global variable
2374 * pathopt will be set to point to it; otherwise pathopt will be set to
2377 static const char *pathopt; /* set by path_advance */
2380 path_advance(const char **path, const char *name)
2390 for (p = start; *p && *p != ':' && *p != '%'; p++)
2392 len = p - start + strlen(name) + 2; /* "2" is for '/' and '\0' */
2393 while (stackblocksize() < len)
2397 memcpy(q, start, p - start);
2405 while (*p && *p != ':')
2412 return stalloc(len);
2416 /* ============ Prompt */
2418 static smallint doprompt; /* if set, prompt the user */
2419 static smallint needprompt; /* true if interactive and at start of line */
2421 #if ENABLE_FEATURE_EDITING
2422 static line_input_t *line_input_state;
2423 static const char *cmdedit_prompt;
2425 putprompt(const char *s)
2427 if (ENABLE_ASH_EXPAND_PRMT) {
2428 free((char*)cmdedit_prompt);
2429 cmdedit_prompt = ckstrdup(s);
2436 putprompt(const char *s)
2442 #if ENABLE_ASH_EXPAND_PRMT
2443 /* expandstr() needs parsing machinery, so it is far away ahead... */
2444 static const char *expandstr(const char *ps);
2446 #define expandstr(s) s
2450 setprompt_if(smallint do_set, int whichprompt)
2453 IF_ASH_EXPAND_PRMT(struct stackmark smark;)
2460 switch (whichprompt) {
2470 #if ENABLE_ASH_EXPAND_PRMT
2471 setstackmark(&smark);
2472 stalloc(stackblocksize());
2474 putprompt(expandstr(prompt));
2475 #if ENABLE_ASH_EXPAND_PRMT
2476 popstackmark(&smark);
2481 /* ============ The cd and pwd commands */
2483 #define CD_PHYSICAL 1
2493 while ((i = nextopt("LP")) != '\0') {
2495 flags ^= CD_PHYSICAL;
2504 * Update curdir (the name of the current directory) in response to a
2508 updatepwd(const char *dir)
2515 cdcomppath = ststrdup(dir);
2518 if (curdir == nullstr)
2520 new = stack_putstr(curdir, new);
2522 new = makestrspace(strlen(dir) + 2, new);
2523 lim = (char *)stackblock() + 1;
2527 if (new > lim && *lim == '/')
2532 if (dir[1] == '/' && dir[2] != '/') {
2538 p = strtok(cdcomppath, "/");
2542 if (p[1] == '.' && p[2] == '\0') {
2554 new = stack_putstr(p, new);
2562 return stackblock();
2566 * Find out what the current directory is. If we already know the current
2567 * directory, this routine returns immediately.
2572 char *dir = getcwd(NULL, 0); /* huh, using glibc extension? */
2573 return dir ? dir : nullstr;
2577 setpwd(const char *val, int setold)
2581 oldcur = dir = curdir;
2584 setvar("OLDPWD", oldcur, VEXPORT);
2587 if (physdir != nullstr) {
2588 if (physdir != oldcur)
2592 if (oldcur == val || !val) {
2598 dir = ckstrdup(val);
2599 if (oldcur != dir && oldcur != nullstr) {
2604 setvar("PWD", dir, VEXPORT);
2607 static void hashcd(void);
2610 * Actually do the chdir. We also call hashcd to let the routines in exec.c
2611 * know that the current directory has changed.
2614 docd(const char *dest, int flags)
2616 const char *dir = NULL;
2619 TRACE(("docd(\"%s\", %d) called\n", dest, flags));
2622 if (!(flags & CD_PHYSICAL)) {
2623 dir = updatepwd(dest);
2637 static int FAST_FUNC
2638 cdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
2650 dest = bltinlookup("HOME");
2651 else if (LONE_DASH(dest)) {
2652 dest = bltinlookup("OLDPWD");
2674 path = bltinlookup("CDPATH");
2683 p = path_advance(&path, dest);
2684 if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
2688 if (!docd(p, flags))
2693 ash_msg_and_raise_error("can't cd to %s", dest);
2696 if (flags & CD_PRINT)
2697 out1fmt("%s\n", curdir);
2701 static int FAST_FUNC
2702 pwdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
2705 const char *dir = curdir;
2709 if (physdir == nullstr)
2713 out1fmt("%s\n", dir);
2718 /* ============ ... */
2721 #define IBUFSIZ (ENABLE_FEATURE_EDITING ? CONFIG_FEATURE_EDITING_MAX_LEN : 1024)
2723 /* Syntax classes */
2724 #define CWORD 0 /* character is nothing special */
2725 #define CNL 1 /* newline character */
2726 #define CBACK 2 /* a backslash character */
2727 #define CSQUOTE 3 /* single quote */
2728 #define CDQUOTE 4 /* double quote */
2729 #define CENDQUOTE 5 /* a terminating quote */
2730 #define CBQUOTE 6 /* backwards single quote */
2731 #define CVAR 7 /* a dollar sign */
2732 #define CENDVAR 8 /* a '}' character */
2733 #define CLP 9 /* a left paren in arithmetic */
2734 #define CRP 10 /* a right paren in arithmetic */
2735 #define CENDFILE 11 /* end of file */
2736 #define CCTL 12 /* like CWORD, except it must be escaped */
2737 #define CSPCL 13 /* these terminate a word */
2738 #define CIGN 14 /* character should be ignored */
2741 #if ENABLE_ASH_ALIAS
2745 #define USE_SIT_FUNCTION ENABLE_ASH_OPTIMIZE_FOR_SIZE
2747 #if ENABLE_SH_MATH_SUPPORT
2748 # define SIT_ITEM(a,b,c,d) (a | (b << 4) | (c << 8) | (d << 12))
2750 # define SIT_ITEM(a,b,c,d) (a | (b << 4) | (c << 8))
2752 static const uint16_t S_I_T[] = {
2753 #if ENABLE_ASH_ALIAS
2754 SIT_ITEM(CSPCL , CIGN , CIGN , CIGN ), /* 0, PEOA */
2756 SIT_ITEM(CSPCL , CWORD , CWORD, CWORD ), /* 1, ' ' */
2757 SIT_ITEM(CNL , CNL , CNL , CNL ), /* 2, \n */
2758 SIT_ITEM(CWORD , CCTL , CCTL , CWORD ), /* 3, !*-/:=?[]~ */
2759 SIT_ITEM(CDQUOTE , CENDQUOTE, CWORD, CWORD ), /* 4, '"' */
2760 SIT_ITEM(CVAR , CVAR , CWORD, CVAR ), /* 5, $ */
2761 SIT_ITEM(CSQUOTE , CWORD , CENDQUOTE, CWORD), /* 6, "'" */
2762 SIT_ITEM(CSPCL , CWORD , CWORD, CLP ), /* 7, ( */
2763 SIT_ITEM(CSPCL , CWORD , CWORD, CRP ), /* 8, ) */
2764 SIT_ITEM(CBACK , CBACK , CCTL , CBACK ), /* 9, \ */
2765 SIT_ITEM(CBQUOTE , CBQUOTE , CWORD, CBQUOTE), /* 10, ` */
2766 SIT_ITEM(CENDVAR , CENDVAR , CWORD, CENDVAR), /* 11, } */
2767 #if !USE_SIT_FUNCTION
2768 SIT_ITEM(CENDFILE, CENDFILE , CENDFILE, CENDFILE),/* 12, PEOF */
2769 SIT_ITEM(CWORD , CWORD , CWORD, CWORD ), /* 13, 0-9A-Za-z */
2770 SIT_ITEM(CCTL , CCTL , CCTL , CCTL ) /* 14, CTLESC ... */
2774 /* Constants below must match table above */
2776 #if ENABLE_ASH_ALIAS
2777 CSPCL_CIGN_CIGN_CIGN , /* 0 */
2779 CSPCL_CWORD_CWORD_CWORD , /* 1 */
2780 CNL_CNL_CNL_CNL , /* 2 */
2781 CWORD_CCTL_CCTL_CWORD , /* 3 */
2782 CDQUOTE_CENDQUOTE_CWORD_CWORD , /* 4 */
2783 CVAR_CVAR_CWORD_CVAR , /* 5 */
2784 CSQUOTE_CWORD_CENDQUOTE_CWORD , /* 6 */
2785 CSPCL_CWORD_CWORD_CLP , /* 7 */
2786 CSPCL_CWORD_CWORD_CRP , /* 8 */
2787 CBACK_CBACK_CCTL_CBACK , /* 9 */
2788 CBQUOTE_CBQUOTE_CWORD_CBQUOTE , /* 10 */
2789 CENDVAR_CENDVAR_CWORD_CENDVAR , /* 11 */
2790 CENDFILE_CENDFILE_CENDFILE_CENDFILE, /* 12 */
2791 CWORD_CWORD_CWORD_CWORD , /* 13 */
2792 CCTL_CCTL_CCTL_CCTL , /* 14 */
2795 /* c in SIT(c, syntax) must be an *unsigned char* or PEOA or PEOF,
2796 * caller must ensure proper cast on it if c is *char_ptr!
2798 /* Values for syntax param */
2799 #define BASESYNTAX 0 /* not in quotes */
2800 #define DQSYNTAX 1 /* in double quotes */
2801 #define SQSYNTAX 2 /* in single quotes */
2802 #define ARISYNTAX 3 /* in arithmetic */
2803 #define PSSYNTAX 4 /* prompt. never passed to SIT() */
2805 #if USE_SIT_FUNCTION
2808 SIT(int c, int syntax)
2810 static const char spec_symbls[] ALIGN1 = "\t\n !\"$&'()*-/:;<=>?[\\]`|}~";
2811 # if ENABLE_ASH_ALIAS
2812 static const uint8_t syntax_index_table[] ALIGN1 = {
2813 1, 2, 1, 3, 4, 5, 1, 6, /* "\t\n !\"$&'" */
2814 7, 8, 3, 3, 3, 3, 1, 1, /* "()*-/:;<" */
2815 3, 1, 3, 3, 9, 3, 10, 1, /* "=>?[\\]`|" */
2819 static const uint8_t syntax_index_table[] ALIGN1 = {
2820 0, 1, 0, 2, 3, 4, 0, 5, /* "\t\n !\"$&'" */
2821 6, 7, 2, 2, 2, 2, 0, 0, /* "()*-/:;<" */
2822 2, 0, 2, 2, 8, 2, 9, 0, /* "=>?[\\]`|" */
2831 # if ENABLE_ASH_ALIAS
2837 /* Cast is purely for paranoia here,
2838 * just in case someone passed signed char to us */
2839 if ((unsigned char)c >= CTL_FIRST
2840 && (unsigned char)c <= CTL_LAST
2844 s = strchrnul(spec_symbls, c);
2847 indx = syntax_index_table[s - spec_symbls];
2849 return (S_I_T[indx] >> (syntax*4)) & 0xf;
2852 #else /* !USE_SIT_FUNCTION */
2854 static const uint8_t syntax_index_table[] = {
2855 /* BASESYNTAX_DQSYNTAX_SQSYNTAX_ARISYNTAX */
2856 /* 0 */ CWORD_CWORD_CWORD_CWORD,
2857 /* 1 */ CWORD_CWORD_CWORD_CWORD,
2858 /* 2 */ CWORD_CWORD_CWORD_CWORD,
2859 /* 3 */ CWORD_CWORD_CWORD_CWORD,
2860 /* 4 */ CWORD_CWORD_CWORD_CWORD,
2861 /* 5 */ CWORD_CWORD_CWORD_CWORD,
2862 /* 6 */ CWORD_CWORD_CWORD_CWORD,
2863 /* 7 */ CWORD_CWORD_CWORD_CWORD,
2864 /* 8 */ CWORD_CWORD_CWORD_CWORD,
2865 /* 9 "\t" */ CSPCL_CWORD_CWORD_CWORD,
2866 /* 10 "\n" */ CNL_CNL_CNL_CNL,
2867 /* 11 */ CWORD_CWORD_CWORD_CWORD,
2868 /* 12 */ CWORD_CWORD_CWORD_CWORD,
2869 /* 13 */ CWORD_CWORD_CWORD_CWORD,
2870 /* 14 */ CWORD_CWORD_CWORD_CWORD,
2871 /* 15 */ CWORD_CWORD_CWORD_CWORD,
2872 /* 16 */ CWORD_CWORD_CWORD_CWORD,
2873 /* 17 */ CWORD_CWORD_CWORD_CWORD,
2874 /* 18 */ CWORD_CWORD_CWORD_CWORD,
2875 /* 19 */ CWORD_CWORD_CWORD_CWORD,
2876 /* 20 */ CWORD_CWORD_CWORD_CWORD,
2877 /* 21 */ CWORD_CWORD_CWORD_CWORD,
2878 /* 22 */ CWORD_CWORD_CWORD_CWORD,
2879 /* 23 */ CWORD_CWORD_CWORD_CWORD,
2880 /* 24 */ CWORD_CWORD_CWORD_CWORD,
2881 /* 25 */ CWORD_CWORD_CWORD_CWORD,
2882 /* 26 */ CWORD_CWORD_CWORD_CWORD,
2883 /* 27 */ CWORD_CWORD_CWORD_CWORD,
2884 /* 28 */ CWORD_CWORD_CWORD_CWORD,
2885 /* 29 */ CWORD_CWORD_CWORD_CWORD,
2886 /* 30 */ CWORD_CWORD_CWORD_CWORD,
2887 /* 31 */ CWORD_CWORD_CWORD_CWORD,
2888 /* 32 " " */ CSPCL_CWORD_CWORD_CWORD,
2889 /* 33 "!" */ CWORD_CCTL_CCTL_CWORD,
2890 /* 34 """ */ CDQUOTE_CENDQUOTE_CWORD_CWORD,
2891 /* 35 "#" */ CWORD_CWORD_CWORD_CWORD,
2892 /* 36 "$" */ CVAR_CVAR_CWORD_CVAR,
2893 /* 37 "%" */ CWORD_CWORD_CWORD_CWORD,
2894 /* 38 "&" */ CSPCL_CWORD_CWORD_CWORD,
2895 /* 39 "'" */ CSQUOTE_CWORD_CENDQUOTE_CWORD,
2896 /* 40 "(" */ CSPCL_CWORD_CWORD_CLP,
2897 /* 41 ")" */ CSPCL_CWORD_CWORD_CRP,
2898 /* 42 "*" */ CWORD_CCTL_CCTL_CWORD,
2899 /* 43 "+" */ CWORD_CWORD_CWORD_CWORD,
2900 /* 44 "," */ CWORD_CWORD_CWORD_CWORD,
2901 /* 45 "-" */ CWORD_CCTL_CCTL_CWORD,
2902 /* 46 "." */ CWORD_CWORD_CWORD_CWORD,
2903 /* 47 "/" */ CWORD_CCTL_CCTL_CWORD,
2904 /* 48 "0" */ CWORD_CWORD_CWORD_CWORD,
2905 /* 49 "1" */ CWORD_CWORD_CWORD_CWORD,
2906 /* 50 "2" */ CWORD_CWORD_CWORD_CWORD,
2907 /* 51 "3" */ CWORD_CWORD_CWORD_CWORD,
2908 /* 52 "4" */ CWORD_CWORD_CWORD_CWORD,
2909 /* 53 "5" */ CWORD_CWORD_CWORD_CWORD,
2910 /* 54 "6" */ CWORD_CWORD_CWORD_CWORD,
2911 /* 55 "7" */ CWORD_CWORD_CWORD_CWORD,
2912 /* 56 "8" */ CWORD_CWORD_CWORD_CWORD,
2913 /* 57 "9" */ CWORD_CWORD_CWORD_CWORD,
2914 /* 58 ":" */ CWORD_CCTL_CCTL_CWORD,
2915 /* 59 ";" */ CSPCL_CWORD_CWORD_CWORD,
2916 /* 60 "<" */ CSPCL_CWORD_CWORD_CWORD,
2917 /* 61 "=" */ CWORD_CCTL_CCTL_CWORD,
2918 /* 62 ">" */ CSPCL_CWORD_CWORD_CWORD,
2919 /* 63 "?" */ CWORD_CCTL_CCTL_CWORD,
2920 /* 64 "@" */ CWORD_CWORD_CWORD_CWORD,
2921 /* 65 "A" */ CWORD_CWORD_CWORD_CWORD,
2922 /* 66 "B" */ CWORD_CWORD_CWORD_CWORD,
2923 /* 67 "C" */ CWORD_CWORD_CWORD_CWORD,
2924 /* 68 "D" */ CWORD_CWORD_CWORD_CWORD,
2925 /* 69 "E" */ CWORD_CWORD_CWORD_CWORD,
2926 /* 70 "F" */ CWORD_CWORD_CWORD_CWORD,
2927 /* 71 "G" */ CWORD_CWORD_CWORD_CWORD,
2928 /* 72 "H" */ CWORD_CWORD_CWORD_CWORD,
2929 /* 73 "I" */ CWORD_CWORD_CWORD_CWORD,
2930 /* 74 "J" */ CWORD_CWORD_CWORD_CWORD,
2931 /* 75 "K" */ CWORD_CWORD_CWORD_CWORD,
2932 /* 76 "L" */ CWORD_CWORD_CWORD_CWORD,
2933 /* 77 "M" */ CWORD_CWORD_CWORD_CWORD,
2934 /* 78 "N" */ CWORD_CWORD_CWORD_CWORD,
2935 /* 79 "O" */ CWORD_CWORD_CWORD_CWORD,
2936 /* 80 "P" */ CWORD_CWORD_CWORD_CWORD,
2937 /* 81 "Q" */ CWORD_CWORD_CWORD_CWORD,
2938 /* 82 "R" */ CWORD_CWORD_CWORD_CWORD,
2939 /* 83 "S" */ CWORD_CWORD_CWORD_CWORD,
2940 /* 84 "T" */ CWORD_CWORD_CWORD_CWORD,
2941 /* 85 "U" */ CWORD_CWORD_CWORD_CWORD,
2942 /* 86 "V" */ CWORD_CWORD_CWORD_CWORD,
2943 /* 87 "W" */ CWORD_CWORD_CWORD_CWORD,
2944 /* 88 "X" */ CWORD_CWORD_CWORD_CWORD,
2945 /* 89 "Y" */ CWORD_CWORD_CWORD_CWORD,
2946 /* 90 "Z" */ CWORD_CWORD_CWORD_CWORD,
2947 /* 91 "[" */ CWORD_CCTL_CCTL_CWORD,
2948 /* 92 "\" */ CBACK_CBACK_CCTL_CBACK,
2949 /* 93 "]" */ CWORD_CCTL_CCTL_CWORD,
2950 /* 94 "^" */ CWORD_CWORD_CWORD_CWORD,
2951 /* 95 "_" */ CWORD_CWORD_CWORD_CWORD,
2952 /* 96 "`" */ CBQUOTE_CBQUOTE_CWORD_CBQUOTE,
2953 /* 97 "a" */ CWORD_CWORD_CWORD_CWORD,
2954 /* 98 "b" */ CWORD_CWORD_CWORD_CWORD,
2955 /* 99 "c" */ CWORD_CWORD_CWORD_CWORD,
2956 /* 100 "d" */ CWORD_CWORD_CWORD_CWORD,
2957 /* 101 "e" */ CWORD_CWORD_CWORD_CWORD,
2958 /* 102 "f" */ CWORD_CWORD_CWORD_CWORD,
2959 /* 103 "g" */ CWORD_CWORD_CWORD_CWORD,
2960 /* 104 "h" */ CWORD_CWORD_CWORD_CWORD,
2961 /* 105 "i" */ CWORD_CWORD_CWORD_CWORD,
2962 /* 106 "j" */ CWORD_CWORD_CWORD_CWORD,
2963 /* 107 "k" */ CWORD_CWORD_CWORD_CWORD,
2964 /* 108 "l" */ CWORD_CWORD_CWORD_CWORD,
2965 /* 109 "m" */ CWORD_CWORD_CWORD_CWORD,
2966 /* 110 "n" */ CWORD_CWORD_CWORD_CWORD,
2967 /* 111 "o" */ CWORD_CWORD_CWORD_CWORD,
2968 /* 112 "p" */ CWORD_CWORD_CWORD_CWORD,
2969 /* 113 "q" */ CWORD_CWORD_CWORD_CWORD,
2970 /* 114 "r" */ CWORD_CWORD_CWORD_CWORD,
2971 /* 115 "s" */ CWORD_CWORD_CWORD_CWORD,
2972 /* 116 "t" */ CWORD_CWORD_CWORD_CWORD,
2973 /* 117 "u" */ CWORD_CWORD_CWORD_CWORD,
2974 /* 118 "v" */ CWORD_CWORD_CWORD_CWORD,
2975 /* 119 "w" */ CWORD_CWORD_CWORD_CWORD,
2976 /* 120 "x" */ CWORD_CWORD_CWORD_CWORD,
2977 /* 121 "y" */ CWORD_CWORD_CWORD_CWORD,
2978 /* 122 "z" */ CWORD_CWORD_CWORD_CWORD,
2979 /* 123 "{" */ CWORD_CWORD_CWORD_CWORD,
2980 /* 124 "|" */ CSPCL_CWORD_CWORD_CWORD,
2981 /* 125 "}" */ CENDVAR_CENDVAR_CWORD_CENDVAR,
2982 /* 126 "~" */ CWORD_CCTL_CCTL_CWORD,
2983 /* 127 del */ CWORD_CWORD_CWORD_CWORD,
2984 /* 128 0x80 */ CWORD_CWORD_CWORD_CWORD,
2985 /* 129 CTLESC */ CCTL_CCTL_CCTL_CCTL,
2986 /* 130 CTLVAR */ CCTL_CCTL_CCTL_CCTL,
2987 /* 131 CTLENDVAR */ CCTL_CCTL_CCTL_CCTL,
2988 /* 132 CTLBACKQ */ CCTL_CCTL_CCTL_CCTL,
2989 /* 133 CTLQUOTE */ CCTL_CCTL_CCTL_CCTL,
2990 /* 134 CTLARI */ CCTL_CCTL_CCTL_CCTL,
2991 /* 135 CTLENDARI */ CCTL_CCTL_CCTL_CCTL,
2992 /* 136 CTLQUOTEMARK */ CCTL_CCTL_CCTL_CCTL,
2993 /* 137 */ CWORD_CWORD_CWORD_CWORD,
2994 /* 138 */ CWORD_CWORD_CWORD_CWORD,
2995 /* 139 */ CWORD_CWORD_CWORD_CWORD,
2996 /* 140 */ CWORD_CWORD_CWORD_CWORD,
2997 /* 141 */ CWORD_CWORD_CWORD_CWORD,
2998 /* 142 */ CWORD_CWORD_CWORD_CWORD,
2999 /* 143 */ CWORD_CWORD_CWORD_CWORD,
3000 /* 144 */ CWORD_CWORD_CWORD_CWORD,
3001 /* 145 */ CWORD_CWORD_CWORD_CWORD,
3002 /* 146 */ CWORD_CWORD_CWORD_CWORD,
3003 /* 147 */ CWORD_CWORD_CWORD_CWORD,
3004 /* 148 */ CWORD_CWORD_CWORD_CWORD,
3005 /* 149 */ CWORD_CWORD_CWORD_CWORD,
3006 /* 150 */ CWORD_CWORD_CWORD_CWORD,
3007 /* 151 */ CWORD_CWORD_CWORD_CWORD,
3008 /* 152 */ CWORD_CWORD_CWORD_CWORD,
3009 /* 153 */ CWORD_CWORD_CWORD_CWORD,
3010 /* 154 */ CWORD_CWORD_CWORD_CWORD,
3011 /* 155 */ CWORD_CWORD_CWORD_CWORD,
3012 /* 156 */ CWORD_CWORD_CWORD_CWORD,
3013 /* 157 */ CWORD_CWORD_CWORD_CWORD,
3014 /* 158 */ CWORD_CWORD_CWORD_CWORD,
3015 /* 159 */ CWORD_CWORD_CWORD_CWORD,
3016 /* 160 */ CWORD_CWORD_CWORD_CWORD,
3017 /* 161 */ CWORD_CWORD_CWORD_CWORD,
3018 /* 162 */ CWORD_CWORD_CWORD_CWORD,
3019 /* 163 */ CWORD_CWORD_CWORD_CWORD,
3020 /* 164 */ CWORD_CWORD_CWORD_CWORD,
3021 /* 165 */ CWORD_CWORD_CWORD_CWORD,
3022 /* 166 */ CWORD_CWORD_CWORD_CWORD,
3023 /* 167 */ CWORD_CWORD_CWORD_CWORD,
3024 /* 168 */ CWORD_CWORD_CWORD_CWORD,
3025 /* 169 */ CWORD_CWORD_CWORD_CWORD,
3026 /* 170 */ CWORD_CWORD_CWORD_CWORD,
3027 /* 171 */ CWORD_CWORD_CWORD_CWORD,
3028 /* 172 */ CWORD_CWORD_CWORD_CWORD,
3029 /* 173 */ CWORD_CWORD_CWORD_CWORD,
3030 /* 174 */ CWORD_CWORD_CWORD_CWORD,
3031 /* 175 */ CWORD_CWORD_CWORD_CWORD,
3032 /* 176 */ CWORD_CWORD_CWORD_CWORD,
3033 /* 177 */ CWORD_CWORD_CWORD_CWORD,
3034 /* 178 */ CWORD_CWORD_CWORD_CWORD,
3035 /* 179 */ CWORD_CWORD_CWORD_CWORD,
3036 /* 180 */ CWORD_CWORD_CWORD_CWORD,
3037 /* 181 */ CWORD_CWORD_CWORD_CWORD,
3038 /* 182 */ CWORD_CWORD_CWORD_CWORD,
3039 /* 183 */ CWORD_CWORD_CWORD_CWORD,
3040 /* 184 */ CWORD_CWORD_CWORD_CWORD,
3041 /* 185 */ CWORD_CWORD_CWORD_CWORD,
3042 /* 186 */ CWORD_CWORD_CWORD_CWORD,
3043 /* 187 */ CWORD_CWORD_CWORD_CWORD,
3044 /* 188 */ CWORD_CWORD_CWORD_CWORD,
3045 /* 189 */ CWORD_CWORD_CWORD_CWORD,
3046 /* 190 */ CWORD_CWORD_CWORD_CWORD,
3047 /* 191 */ CWORD_CWORD_CWORD_CWORD,
3048 /* 192 */ CWORD_CWORD_CWORD_CWORD,
3049 /* 193 */ CWORD_CWORD_CWORD_CWORD,
3050 /* 194 */ CWORD_CWORD_CWORD_CWORD,
3051 /* 195 */ CWORD_CWORD_CWORD_CWORD,
3052 /* 196 */ CWORD_CWORD_CWORD_CWORD,
3053 /* 197 */ CWORD_CWORD_CWORD_CWORD,
3054 /* 198 */ CWORD_CWORD_CWORD_CWORD,
3055 /* 199 */ CWORD_CWORD_CWORD_CWORD,
3056 /* 200 */ CWORD_CWORD_CWORD_CWORD,
3057 /* 201 */ CWORD_CWORD_CWORD_CWORD,
3058 /* 202 */ CWORD_CWORD_CWORD_CWORD,
3059 /* 203 */ CWORD_CWORD_CWORD_CWORD,
3060 /* 204 */ CWORD_CWORD_CWORD_CWORD,
3061 /* 205 */ CWORD_CWORD_CWORD_CWORD,
3062 /* 206 */ CWORD_CWORD_CWORD_CWORD,
3063 /* 207 */ CWORD_CWORD_CWORD_CWORD,
3064 /* 208 */ CWORD_CWORD_CWORD_CWORD,
3065 /* 209 */ CWORD_CWORD_CWORD_CWORD,
3066 /* 210 */ CWORD_CWORD_CWORD_CWORD,
3067 /* 211 */ CWORD_CWORD_CWORD_CWORD,
3068 /* 212 */ CWORD_CWORD_CWORD_CWORD,
3069 /* 213 */ CWORD_CWORD_CWORD_CWORD,
3070 /* 214 */ CWORD_CWORD_CWORD_CWORD,
3071 /* 215 */ CWORD_CWORD_CWORD_CWORD,
3072 /* 216 */ CWORD_CWORD_CWORD_CWORD,
3073 /* 217 */ CWORD_CWORD_CWORD_CWORD,
3074 /* 218 */ CWORD_CWORD_CWORD_CWORD,
3075 /* 219 */ CWORD_CWORD_CWORD_CWORD,
3076 /* 220 */ CWORD_CWORD_CWORD_CWORD,
3077 /* 221 */ CWORD_CWORD_CWORD_CWORD,
3078 /* 222 */ CWORD_CWORD_CWORD_CWORD,
3079 /* 223 */ CWORD_CWORD_CWORD_CWORD,
3080 /* 224 */ CWORD_CWORD_CWORD_CWORD,
3081 /* 225 */ CWORD_CWORD_CWORD_CWORD,
3082 /* 226 */ CWORD_CWORD_CWORD_CWORD,
3083 /* 227 */ CWORD_CWORD_CWORD_CWORD,
3084 /* 228 */ CWORD_CWORD_CWORD_CWORD,
3085 /* 229 */ CWORD_CWORD_CWORD_CWORD,
3086 /* 230 */ CWORD_CWORD_CWORD_CWORD,
3087 /* 231 */ CWORD_CWORD_CWORD_CWORD,
3088 /* 232 */ CWORD_CWORD_CWORD_CWORD,
3089 /* 233 */ CWORD_CWORD_CWORD_CWORD,
3090 /* 234 */ CWORD_CWORD_CWORD_CWORD,
3091 /* 235 */ CWORD_CWORD_CWORD_CWORD,
3092 /* 236 */ CWORD_CWORD_CWORD_CWORD,
3093 /* 237 */ CWORD_CWORD_CWORD_CWORD,
3094 /* 238 */ CWORD_CWORD_CWORD_CWORD,
3095 /* 239 */ CWORD_CWORD_CWORD_CWORD,
3096 /* 230 */ CWORD_CWORD_CWORD_CWORD,
3097 /* 241 */ CWORD_CWORD_CWORD_CWORD,
3098 /* 242 */ CWORD_CWORD_CWORD_CWORD,
3099 /* 243 */ CWORD_CWORD_CWORD_CWORD,
3100 /* 244 */ CWORD_CWORD_CWORD_CWORD,
3101 /* 245 */ CWORD_CWORD_CWORD_CWORD,
3102 /* 246 */ CWORD_CWORD_CWORD_CWORD,
3103 /* 247 */ CWORD_CWORD_CWORD_CWORD,
3104 /* 248 */ CWORD_CWORD_CWORD_CWORD,
3105 /* 249 */ CWORD_CWORD_CWORD_CWORD,
3106 /* 250 */ CWORD_CWORD_CWORD_CWORD,
3107 /* 251 */ CWORD_CWORD_CWORD_CWORD,
3108 /* 252 */ CWORD_CWORD_CWORD_CWORD,
3109 /* 253 */ CWORD_CWORD_CWORD_CWORD,
3110 /* 254 */ CWORD_CWORD_CWORD_CWORD,
3111 /* 255 */ CWORD_CWORD_CWORD_CWORD,
3112 /* PEOF */ CENDFILE_CENDFILE_CENDFILE_CENDFILE,
3113 # if ENABLE_ASH_ALIAS
3114 /* PEOA */ CSPCL_CIGN_CIGN_CIGN,
3118 # define SIT(c, syntax) ((S_I_T[syntax_index_table[c]] >> ((syntax)*4)) & 0xf)
3120 #endif /* !USE_SIT_FUNCTION */
3123 /* ============ Alias handling */
3125 #if ENABLE_ASH_ALIAS
3127 #define ALIASINUSE 1
3138 static struct alias **atab; // [ATABSIZE];
3139 #define INIT_G_alias() do { \
3140 atab = xzalloc(ATABSIZE * sizeof(atab[0])); \
3144 static struct alias **
3145 __lookupalias(const char *name) {
3146 unsigned int hashval;
3153 ch = (unsigned char)*p;
3157 ch = (unsigned char)*++p;
3159 app = &atab[hashval % ATABSIZE];
3161 for (; *app; app = &(*app)->next) {
3162 if (strcmp(name, (*app)->name) == 0) {
3170 static struct alias *
3171 lookupalias(const char *name, int check)
3173 struct alias *ap = *__lookupalias(name);
3175 if (check && ap && (ap->flag & ALIASINUSE))
3180 static struct alias *
3181 freealias(struct alias *ap)
3185 if (ap->flag & ALIASINUSE) {
3186 ap->flag |= ALIASDEAD;
3198 setalias(const char *name, const char *val)
3200 struct alias *ap, **app;
3202 app = __lookupalias(name);
3206 if (!(ap->flag & ALIASINUSE)) {
3209 ap->val = ckstrdup(val);
3210 ap->flag &= ~ALIASDEAD;
3213 ap = ckzalloc(sizeof(struct alias));
3214 ap->name = ckstrdup(name);
3215 ap->val = ckstrdup(val);
3216 /*ap->flag = 0; - ckzalloc did it */
3217 /*ap->next = NULL;*/
3224 unalias(const char *name)
3228 app = __lookupalias(name);
3232 *app = freealias(*app);
3243 struct alias *ap, **app;
3247 for (i = 0; i < ATABSIZE; i++) {
3249 for (ap = *app; ap; ap = *app) {
3250 *app = freealias(*app);
3260 printalias(const struct alias *ap)
3262 out1fmt("%s=%s\n", ap->name, single_quote(ap->val));
3266 * TODO - sort output
3268 static int FAST_FUNC
3269 aliascmd(int argc UNUSED_PARAM, char **argv)
3278 for (i = 0; i < ATABSIZE; i++) {
3279 for (ap = atab[i]; ap; ap = ap->next) {
3285 while ((n = *++argv) != NULL) {
3286 v = strchr(n+1, '=');
3287 if (v == NULL) { /* n+1: funny ksh stuff */
3288 ap = *__lookupalias(n);
3290 fprintf(stderr, "%s: %s not found\n", "alias", n);
3303 static int FAST_FUNC
3304 unaliascmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
3308 while ((i = nextopt("a")) != '\0') {
3314 for (i = 0; *argptr; argptr++) {
3315 if (unalias(*argptr)) {
3316 fprintf(stderr, "%s: %s not found\n", "unalias", *argptr);
3324 #endif /* ASH_ALIAS */
3327 /* ============ jobs.c */
3329 /* Mode argument to forkshell. Don't change FORK_FG or FORK_BG. */
3332 #define FORK_NOJOB 2
3334 /* mode flags for showjob(s) */
3335 #define SHOW_ONLY_PGID 0x01 /* show only pgid (jobs -p) */
3336 #define SHOW_PIDS 0x02 /* show individual pids, not just one line per job */
3337 #define SHOW_CHANGED 0x04 /* only jobs whose state has changed */
3340 * A job structure contains information about a job. A job is either a
3341 * single process or a set of processes contained in a pipeline. In the
3342 * latter case, pidlist will be non-NULL, and will point to a -1 terminated
3346 pid_t ps_pid; /* process id */
3347 int ps_status; /* last process status from wait() */
3348 char *ps_cmd; /* text of command being run */
3352 struct procstat ps0; /* status of process */
3353 struct procstat *ps; /* status or processes when more than one */
3355 int stopstatus; /* status of a stopped job */
3358 nprocs: 16, /* number of processes */
3360 #define JOBRUNNING 0 /* at least one proc running */
3361 #define JOBSTOPPED 1 /* all procs are stopped */
3362 #define JOBDONE 2 /* all procs are completed */
3364 sigint: 1, /* job was killed by SIGINT */
3365 jobctl: 1, /* job running under job control */
3367 waited: 1, /* true if this entry has been waited for */
3368 used: 1, /* true if this entry is in used */
3369 changed: 1; /* true if status has changed */
3370 struct job *prev_job; /* previous job */
3373 static struct job *makejob(/*union node *,*/ int);
3374 static int forkshell(struct job *, union node *, int);
3375 static int waitforjob(struct job *);
3378 enum { doing_jobctl = 0 };
3379 #define setjobctl(on) do {} while (0)
3381 static smallint doing_jobctl; //references:8
3382 static void setjobctl(int);
3389 ignoresig(int signo)
3391 /* Avoid unnecessary system calls. Is it already SIG_IGNed? */
3392 if (sigmode[signo - 1] != S_IGN && sigmode[signo - 1] != S_HARD_IGN) {
3393 /* No, need to do it */
3394 signal(signo, SIG_IGN);
3396 sigmode[signo - 1] = S_HARD_IGN;
3400 * Only one usage site - in setsignal()
3403 signal_handler(int signo)
3405 gotsig[signo - 1] = 1;
3407 if (signo == SIGINT && !trap[SIGINT]) {
3408 if (!suppress_int) {
3410 raise_interrupt(); /* does not return */
3414 pending_sig = signo;
3419 * Set the signal handler for the specified signal. The routine figures
3420 * out what it should be set to.
3423 setsignal(int signo)
3426 char cur_act, new_act;
3427 struct sigaction act;
3431 if (t != NULL) { /* trap for this sig is set */
3433 if (t[0] == '\0') /* trap is "": ignore this sig */
3437 if (rootshell && new_act == S_DFL) {
3440 if (iflag || minusc || sflag == 0)
3449 * "In all cases, bash ignores SIGQUIT. Non-builtin
3450 * commands run by bash have signal handlers
3451 * set to the values inherited by the shell
3452 * from its parent". */
3468 //TODO: if !rootshell, we reset SIGQUIT to DFL,
3469 //whereas we have to restore it to what shell got on entry
3470 //from the parent. See comment above
3472 t = &sigmode[signo - 1];
3475 /* current setting is not yet known */
3476 if (sigaction(signo, NULL, &act)) {
3477 /* pretend it worked; maybe we should give a warning,
3478 * but other shells don't. We don't alter sigmode,
3479 * so we retry every time.
3480 * btw, in Linux it never fails. --vda */
3483 if (act.sa_handler == SIG_IGN) {
3484 cur_act = S_HARD_IGN;
3486 && (signo == SIGTSTP || signo == SIGTTIN || signo == SIGTTOU)
3488 cur_act = S_IGN; /* don't hard ignore these */
3492 if (cur_act == S_HARD_IGN || cur_act == new_act)
3495 act.sa_handler = SIG_DFL;
3498 act.sa_handler = signal_handler;
3499 act.sa_flags = 0; /* matters only if !DFL and !IGN */
3500 sigfillset(&act.sa_mask); /* ditto */
3503 act.sa_handler = SIG_IGN;
3506 sigaction_set(signo, &act);
3511 /* mode flags for set_curjob */
3512 #define CUR_DELETE 2
3513 #define CUR_RUNNING 1
3514 #define CUR_STOPPED 0
3516 /* mode flags for dowait */
3517 #define DOWAIT_NONBLOCK WNOHANG
3518 #define DOWAIT_BLOCK 0
3521 /* pgrp of shell on invocation */
3522 static int initialpgrp; //references:2
3523 static int ttyfd = -1; //5
3526 static struct job *jobtab; //5
3528 static unsigned njobs; //4
3530 static struct job *curjob; //lots
3531 /* number of presumed living untracked jobs */
3532 static int jobless; //4
3535 set_curjob(struct job *jp, unsigned mode)
3538 struct job **jpp, **curp;
3540 /* first remove from list */
3541 jpp = curp = &curjob;
3546 jpp = &jp1->prev_job;
3548 *jpp = jp1->prev_job;
3550 /* Then re-insert in correct position */
3558 /* job being deleted */
3561 /* newly created job or backgrounded job,
3562 put after all stopped jobs. */
3566 if (!jp1 || jp1->state != JOBSTOPPED)
3569 jpp = &jp1->prev_job;
3575 /* newly stopped job - becomes curjob */
3576 jp->prev_job = *jpp;
3584 jobno(const struct job *jp)
3586 return jp - jobtab + 1;
3591 * Convert a job name to a job structure.
3594 #define getjob(name, getctl) getjob(name)
3597 getjob(const char *name, int getctl)
3601 const char *err_msg = "%s: no such job";
3605 char *(*match)(const char *, const char *);
3620 if (c == '+' || c == '%') {
3622 err_msg = "No current job";
3628 err_msg = "No previous job";
3639 jp = jobtab + num - 1;
3654 if (match(jp->ps[0].ps_cmd, p)) {
3658 err_msg = "%s: ambiguous";
3668 err_msg = "job %s not created under job control";
3669 if (getctl && jp->jobctl == 0)
3674 ash_msg_and_raise_error(err_msg, name);
3678 * Mark a job structure as unused.
3681 freejob(struct job *jp)
3683 struct procstat *ps;
3687 for (i = jp->nprocs, ps = jp->ps; --i >= 0; ps++) {
3688 if (ps->ps_cmd != nullstr)
3691 if (jp->ps != &jp->ps0)
3694 set_curjob(jp, CUR_DELETE);
3700 xtcsetpgrp(int fd, pid_t pgrp)
3702 if (tcsetpgrp(fd, pgrp))
3703 ash_msg_and_raise_error("can't set tty process group (%m)");
3707 * Turn job control on and off.
3709 * Note: This code assumes that the third arg to ioctl is a character
3710 * pointer, which is true on Berkeley systems but not System V. Since
3711 * System V doesn't have job control yet, this isn't a problem now.
3713 * Called with interrupts off.
3721 if (on == doing_jobctl || rootshell == 0)
3725 ofd = fd = open(_PATH_TTY, O_RDWR);
3727 /* BTW, bash will try to open(ttyname(0)) if open("/dev/tty") fails.
3728 * That sometimes helps to acquire controlling tty.
3729 * Obviously, a workaround for bugs when someone
3730 * failed to provide a controlling tty to bash! :) */
3736 fd = fcntl(fd, F_DUPFD, 10);
3741 /* fd is a tty at this point */
3742 close_on_exec_on(fd);
3743 while (1) { /* while we are in the background */
3744 pgrp = tcgetpgrp(fd);
3747 ash_msg("can't access tty; job control turned off");
3751 if (pgrp == getpgrp())
3762 xtcsetpgrp(fd, pgrp);
3764 /* turning job control off */
3767 /* was xtcsetpgrp, but this can make exiting ash
3768 * loop forever if pty is already deleted */
3769 tcsetpgrp(fd, pgrp);
3783 static int FAST_FUNC
3784 killcmd(int argc, char **argv)
3786 if (argv[1] && strcmp(argv[1], "-l") != 0) {
3789 if (argv[i][0] == '%') {
3791 * "kill %N" - job kill
3792 * Converting to pgrp / pid kill
3798 jp = getjob(argv[i], 0);
3800 * In jobs started under job control, we signal
3801 * entire process group by kill -PGRP_ID.
3802 * This happens, f.e., in interactive shell.
3804 * Otherwise, we signal each child via
3805 * kill PID1 PID2 PID3.
3807 * sh -c 'sleep 1|sleep 1 & kill %1'
3808 * sh -c 'true|sleep 2 & sleep 1; kill %1'
3809 * sh -c 'true|sleep 1 & sleep 2; kill %1'
3811 n = jp->nprocs; /* can't be 0 (I hope) */
3814 dst = alloca(n * sizeof(int)*4);
3816 for (j = 0; j < n; j++) {
3817 struct procstat *ps = &jp->ps[j];
3818 /* Skip non-running and not-stopped members
3819 * (i.e. dead members) of the job
3821 if (ps->ps_status != -1 && !WIFSTOPPED(ps->ps_status))
3824 * kill_main has matching code to expect
3825 * leading space. Needed to not confuse
3826 * negative pids with "kill -SIGNAL_NO" syntax
3828 dst += sprintf(dst, jp->jobctl ? " -%u" : " %u", (int)ps->ps_pid);
3832 } while (argv[++i]);
3834 return kill_main(argc, argv);
3838 showpipe(struct job *jp /*, FILE *out*/)
3840 struct procstat *ps;
3841 struct procstat *psend;
3843 psend = jp->ps + jp->nprocs;
3844 for (ps = jp->ps + 1; ps < psend; ps++)
3845 printf(" | %s", ps->ps_cmd);
3846 outcslow('\n', stdout);
3847 flush_stdout_stderr();
3852 restartjob(struct job *jp, int mode)
3854 struct procstat *ps;
3860 if (jp->state == JOBDONE)
3862 jp->state = JOBRUNNING;
3863 pgid = jp->ps[0].ps_pid;
3864 if (mode == FORK_FG)
3865 xtcsetpgrp(ttyfd, pgid);
3866 killpg(pgid, SIGCONT);
3870 if (WIFSTOPPED(ps->ps_status)) {
3876 status = (mode == FORK_FG) ? waitforjob(jp) : 0;
3881 static int FAST_FUNC
3882 fg_bgcmd(int argc UNUSED_PARAM, char **argv)
3888 mode = (**argv == 'f') ? FORK_FG : FORK_BG;
3892 jp = getjob(*argv, 1);
3893 if (mode == FORK_BG) {
3894 set_curjob(jp, CUR_RUNNING);
3895 printf("[%d] ", jobno(jp));
3897 out1str(jp->ps[0].ps_cmd);
3898 showpipe(jp /*, stdout*/);
3899 retval = restartjob(jp, mode);
3900 } while (*argv && *++argv);
3906 sprint_status(char *s, int status, int sigonly)
3912 if (!WIFEXITED(status)) {
3914 if (WIFSTOPPED(status))
3915 st = WSTOPSIG(status);
3918 st = WTERMSIG(status);
3920 if (st == SIGINT || st == SIGPIPE)
3923 if (WIFSTOPPED(status))
3928 //TODO: use bbox's get_signame? strsignal adds ~600 bytes to text+rodata
3929 col = fmtstr(s, 32, strsignal(st));
3930 if (WCOREDUMP(status)) {
3931 col += fmtstr(s + col, 16, " (core dumped)");
3933 } else if (!sigonly) {
3934 st = WEXITSTATUS(status);
3936 col = fmtstr(s, 16, "Done(%d)", st);
3938 col = fmtstr(s, 16, "Done");
3945 dowait(int wait_flags, struct job *job)
3950 struct job *thisjob;
3953 TRACE(("dowait(0x%x) called\n", wait_flags));
3955 /* Do a wait system call. If job control is compiled in, we accept
3956 * stopped processes. wait_flags may have WNOHANG, preventing blocking.
3957 * NB: _not_ safe_waitpid, we need to detect EINTR */
3959 wait_flags |= WUNTRACED;
3960 pid = waitpid(-1, &status, wait_flags);
3961 TRACE(("wait returns pid=%d, status=0x%x, errno=%d(%s)\n",
3962 pid, status, errno, strerror(errno)));
3968 for (jp = curjob; jp; jp = jp->prev_job) {
3969 struct procstat *ps;
3970 struct procstat *psend;
3971 if (jp->state == JOBDONE)
3975 psend = ps + jp->nprocs;
3977 if (ps->ps_pid == pid) {
3978 TRACE(("Job %d: changing status of proc %d "
3979 "from 0x%x to 0x%x\n",
3980 jobno(jp), pid, ps->ps_status, status));
3981 ps->ps_status = status;
3984 if (ps->ps_status == -1)
3987 if (state == JOBRUNNING)
3989 if (WIFSTOPPED(ps->ps_status)) {
3990 jp->stopstatus = ps->ps_status;
3994 } while (++ps < psend);
3999 if (!WIFSTOPPED(status))
4005 if (state != JOBRUNNING) {
4006 thisjob->changed = 1;
4008 if (thisjob->state != state) {
4009 TRACE(("Job %d: changing state from %d to %d\n",
4010 jobno(thisjob), thisjob->state, state));
4011 thisjob->state = state;
4013 if (state == JOBSTOPPED) {
4014 set_curjob(thisjob, CUR_STOPPED);
4023 if (thisjob && thisjob == job) {
4027 len = sprint_status(s, status, 1);
4038 blocking_wait_with_raise_on_sig(void)
4040 pid_t pid = dowait(DOWAIT_BLOCK, NULL);
4041 if (pid <= 0 && pending_sig)
4042 raise_exception(EXSIG);
4048 showjob(FILE *out, struct job *jp, int mode)
4050 struct procstat *ps;
4051 struct procstat *psend;
4058 if (mode & SHOW_ONLY_PGID) { /* jobs -p */
4059 /* just output process (group) id of pipeline */
4060 fprintf(out, "%d\n", ps->ps_pid);
4064 col = fmtstr(s, 16, "[%d] ", jobno(jp));
4069 else if (curjob && jp == curjob->prev_job)
4072 if (mode & SHOW_PIDS)
4073 col += fmtstr(s + col, 16, "%d ", ps->ps_pid);
4075 psend = ps + jp->nprocs;
4077 if (jp->state == JOBRUNNING) {
4078 strcpy(s + col, "Running");
4079 col += sizeof("Running") - 1;
4081 int status = psend[-1].ps_status;
4082 if (jp->state == JOBSTOPPED)
4083 status = jp->stopstatus;
4084 col += sprint_status(s + col, status, 0);
4086 /* By now, "[JOBID]* [maybe PID] STATUS" is printed */
4088 /* This loop either prints "<cmd1> | <cmd2> | <cmd3>" line
4089 * or prints several "PID | <cmdN>" lines,
4090 * depending on SHOW_PIDS bit.
4091 * We do not print status of individual processes
4092 * between PID and <cmdN>. bash does it, but not very well:
4093 * first line shows overall job status, not process status,
4094 * making it impossible to know 1st process status.
4098 /* for each process */
4101 if (mode & SHOW_PIDS)
4102 col = fmtstr(s, 48, "\n%*c%d ", indent_col, ' ', ps->ps_pid) - 1;
4104 fprintf(out, "%s%*c%s%s",
4106 33 - col >= 0 ? 33 - col : 0, ' ',
4107 ps == jp->ps ? "" : "| ",
4110 } while (++ps != psend);
4111 outcslow('\n', out);
4115 if (jp->state == JOBDONE) {
4116 TRACE(("showjob: freeing job %d\n", jobno(jp)));
4122 * Print a list of jobs. If "change" is nonzero, only print jobs whose
4123 * statuses have changed since the last call to showjobs.
4126 showjobs(FILE *out, int mode)
4130 TRACE(("showjobs(0x%x) called\n", mode));
4132 /* Handle all finished jobs */
4133 while (dowait(DOWAIT_NONBLOCK, NULL) > 0)
4136 for (jp = curjob; jp; jp = jp->prev_job) {
4137 if (!(mode & SHOW_CHANGED) || jp->changed) {
4138 showjob(out, jp, mode);
4143 static int FAST_FUNC
4144 jobscmd(int argc UNUSED_PARAM, char **argv)
4149 while ((m = nextopt("lp")) != '\0') {
4153 mode |= SHOW_ONLY_PGID;
4159 showjob(stdout, getjob(*argv, 0), mode);
4162 showjobs(stdout, mode);
4169 /* Called only on finished or stopped jobs (no members are running) */
4171 getstatus(struct job *job)
4175 struct procstat *ps;
4177 /* Fetch last member's status */
4178 ps = job->ps + job->nprocs - 1;
4179 status = ps->ps_status;
4181 /* "set -o pipefail" mode: use last _nonzero_ status */
4182 while (status == 0 && --ps >= job->ps)
4183 status = ps->ps_status;
4186 retval = WEXITSTATUS(status);
4187 if (!WIFEXITED(status)) {
4189 retval = WSTOPSIG(status);
4190 if (!WIFSTOPPED(status))
4193 /* XXX: limits number of signals */
4194 retval = WTERMSIG(status);
4196 if (retval == SIGINT)
4202 TRACE(("getstatus: job %d, nproc %d, status 0x%x, retval 0x%x\n",
4203 jobno(job), job->nprocs, status, retval));
4207 static int FAST_FUNC
4208 waitcmd(int argc UNUSED_PARAM, char **argv)
4215 raise_exception(EXSIG);
4222 /* wait for all jobs */
4226 if (!jp) /* no running procs */
4228 if (jp->state == JOBRUNNING)
4233 blocking_wait_with_raise_on_sig();
4235 * "When bash is waiting for an asynchronous command via
4236 * the wait builtin, the reception of a signal for which a trap
4237 * has been set will cause the wait builtin to return immediately
4238 * with an exit status greater than 128, immediately after which
4239 * the trap is executed."
4241 * blocking_wait_with_raise_on_sig raises signal handlers
4242 * if it gets no pid (pid < 0). However,
4243 * if child sends us a signal *and immediately exits*,
4244 * blocking_wait_with_raise_on_sig gets pid > 0
4245 * and does not handle pending_sig. Check this case: */
4247 raise_exception(EXSIG);
4253 if (**argv != '%') {
4254 pid_t pid = number(*argv);
4259 if (job->ps[job->nprocs - 1].ps_pid == pid)
4261 job = job->prev_job;
4264 job = getjob(*argv, 0);
4266 /* loop until process terminated or stopped */
4267 while (job->state == JOBRUNNING)
4268 blocking_wait_with_raise_on_sig();
4270 retval = getstatus(job);
4283 struct job *jp, *jq;
4285 len = njobs * sizeof(*jp);
4287 jp = ckrealloc(jq, len + 4 * sizeof(*jp));
4289 offset = (char *)jp - (char *)jq;
4291 /* Relocate pointers */
4294 jq = (struct job *)((char *)jq + l);
4298 #define joff(p) ((struct job *)((char *)(p) + l))
4299 #define jmove(p) (p) = (void *)((char *)(p) + offset)
4300 if (joff(jp)->ps == &jq->ps0)
4301 jmove(joff(jp)->ps);
4302 if (joff(jp)->prev_job)
4303 jmove(joff(jp)->prev_job);
4313 jp = (struct job *)((char *)jp + len);
4317 } while (--jq >= jp);
4322 * Return a new job structure.
4323 * Called with interrupts off.
4326 makejob(/*union node *node,*/ int nprocs)
4331 for (i = njobs, jp = jobtab; ; jp++) {
4338 if (jp->state != JOBDONE || !jp->waited)
4347 memset(jp, 0, sizeof(*jp));
4349 /* jp->jobctl is a bitfield.
4350 * "jp->jobctl |= jobctl" likely to give awful code */
4354 jp->prev_job = curjob;
4359 jp->ps = ckmalloc(nprocs * sizeof(struct procstat));
4361 TRACE(("makejob(%d) returns %%%d\n", nprocs,
4368 * Return a string identifying a command (to be printed by the
4371 static char *cmdnextc;
4374 cmdputs(const char *s)
4376 static const char vstype[VSTYPE + 1][3] = {
4377 "", "}", "-", "+", "?", "=",
4378 "%", "%%", "#", "##"
4379 IF_ASH_BASH_COMPAT(, ":", "/", "//")
4382 const char *p, *str;
4386 unsigned char subtype = 0;
4390 nextc = makestrspace((strlen(s) + 1) * 8, cmdnextc);
4392 while ((c = *p++) != '\0') {
4400 if ((subtype & VSTYPE) == VSLENGTH)
4404 if (!(subtype & VSQUOTE) == !(quoted & 1))
4410 str = "\"}" + !(quoted & 1);
4417 case CTLBACKQ+CTLQUOTE:
4420 #if ENABLE_SH_MATH_SUPPORT
4435 if ((subtype & VSTYPE) != VSNORMAL)
4437 str = vstype[subtype & VSTYPE];
4438 if (subtype & VSNUL)
4447 /* These can only happen inside quotes */
4460 while ((c = *str++) != '\0') {
4463 } /* while *p++ not NUL */
4466 USTPUTC('"', nextc);
4472 /* cmdtxt() and cmdlist() call each other */
4473 static void cmdtxt(union node *n);
4476 cmdlist(union node *np, int sep)
4478 for (; np; np = np->narg.next) {
4482 if (sep && np->narg.next)
4488 cmdtxt(union node *n)
4491 struct nodelist *lp;
4502 lp = n->npipe.cmdlist;
4520 cmdtxt(n->nbinary.ch1);
4536 cmdtxt(n->nif.test);
4538 if (n->nif.elsepart) {
4539 cmdtxt(n->nif.ifpart);
4541 n = n->nif.elsepart;
4559 cmdtxt(n->nbinary.ch1);
4569 cmdputs(n->nfor.var);
4571 cmdlist(n->nfor.args, 1);
4576 cmdputs(n->narg.text);
4580 cmdlist(n->ncmd.args, 1);
4581 cmdlist(n->ncmd.redirect, 0);
4594 cmdputs(n->ncase.expr->narg.text);
4596 for (np = n->ncase.cases; np; np = np->nclist.next) {
4597 cmdtxt(np->nclist.pattern);
4599 cmdtxt(np->nclist.body);
4613 #if ENABLE_ASH_BASH_COMPAT
4628 cmdputs(utoa(n->nfile.fd));
4630 if (n->type == NTOFD || n->type == NFROMFD) {
4631 cmdputs(utoa(n->ndup.dupfd));
4640 commandtext(union node *n)
4644 STARTSTACKSTR(cmdnextc);
4646 name = stackblock();
4647 TRACE(("commandtext: name %p, end %p\n\t\"%s\"\n",
4648 name, cmdnextc, cmdnextc));
4649 return ckstrdup(name);
4654 * Fork off a subshell. If we are doing job control, give the subshell its
4655 * own process group. Jp is a job structure that the job is to be added to.
4656 * N is the command that will be evaluated by the child. Both jp and n may
4657 * be NULL. The mode parameter can be one of the following:
4658 * FORK_FG - Fork off a foreground process.
4659 * FORK_BG - Fork off a background process.
4660 * FORK_NOJOB - Like FORK_FG, but don't give the process its own
4661 * process group even if job control is on.
4663 * When job control is turned off, background processes have their standard
4664 * input redirected to /dev/null (except for the second and later processes
4667 * Called with interrupts off.
4670 * Clear traps on a fork.
4677 for (tp = trap; tp < &trap[NSIG]; tp++) {
4678 if (*tp && **tp) { /* trap not NULL or "" (SIG_IGN) */
4680 if (trap_ptr == trap)
4682 /* else: it "belongs" to trap_ptr vector, don't free */
4684 if ((tp - trap) != 0)
4685 setsignal(tp - trap);
4692 /* Lives far away from here, needed for forkchild */
4693 static void closescript(void);
4695 /* Called after fork(), in child */
4696 static NOINLINE void
4697 forkchild(struct job *jp, union node *n, int mode)
4701 TRACE(("Child shell %d\n", getpid()));
4705 /* man bash: "Non-builtin commands run by bash have signal handlers
4706 * set to the values inherited by the shell from its parent".
4707 * Do we do it correctly? */
4711 if (mode == FORK_NOJOB /* is it `xxx` ? */
4712 && n && n->type == NCMD /* is it single cmd? */
4713 /* && n->ncmd.args->type == NARG - always true? */
4714 && n->ncmd.args && strcmp(n->ncmd.args->narg.text, "trap") == 0
4715 && n->ncmd.args->narg.next == NULL /* "trap" with no arguments */
4716 /* && n->ncmd.args->narg.backquote == NULL - do we need to check this? */
4718 TRACE(("Trap hack\n"));
4719 /* Awful hack for `trap` or $(trap).
4721 * http://www.opengroup.org/onlinepubs/009695399/utilities/trap.html
4722 * contains an example where "trap" is executed in a subshell:
4724 * save_traps=$(trap)
4726 * eval "$save_traps"
4728 * Standard does not say that "trap" in subshell shall print
4729 * parent shell's traps. It only says that its output
4730 * must have suitable form, but then, in the above example
4731 * (which is not supposed to be normative), it implies that.
4733 * bash (and probably other shell) does implement it
4734 * (traps are reset to defaults, but "trap" still shows them),
4735 * but as a result, "trap" logic is hopelessly messed up:
4738 * trap -- 'echo Ho' SIGWINCH <--- we have a handler
4739 * # (trap) <--- trap is in subshell - no output (correct, traps are reset)
4740 * # true | trap <--- trap is in subshell - no output (ditto)
4741 * # echo `true | trap` <--- in subshell - output (but traps are reset!)
4742 * trap -- 'echo Ho' SIGWINCH
4743 * # echo `(trap)` <--- in subshell in subshell - output
4744 * trap -- 'echo Ho' SIGWINCH
4745 * # echo `true | (trap)` <--- in subshell in subshell in subshell - output!
4746 * trap -- 'echo Ho' SIGWINCH
4748 * The rules when to forget and when to not forget traps
4749 * get really complex and nonsensical.
4751 * Our solution: ONLY bare $(trap) or `trap` is special.
4753 /* Save trap handler strings for trap builtin to print */
4754 trap_ptr = memcpy(xmalloc(sizeof(trap)), trap, sizeof(trap));
4755 /* Fall through into clearing traps */
4759 /* do job control only in root shell */
4761 if (mode != FORK_NOJOB && jp->jobctl && oldlvl == 0) {
4764 if (jp->nprocs == 0)
4767 pgrp = jp->ps[0].ps_pid;
4768 /* this can fail because we are doing it in the parent also */
4770 if (mode == FORK_FG)
4771 xtcsetpgrp(ttyfd, pgrp);
4776 if (mode == FORK_BG) {
4777 /* man bash: "When job control is not in effect,
4778 * asynchronous commands ignore SIGINT and SIGQUIT" */
4781 if (jp->nprocs == 0) {
4783 if (open(bb_dev_null, O_RDONLY) != 0)
4784 ash_msg_and_raise_error("can't open '%s'", bb_dev_null);
4788 if (iflag) { /* why if iflag only? */
4793 * "In all cases, bash ignores SIGQUIT. Non-builtin
4794 * commands run by bash have signal handlers
4795 * set to the values inherited by the shell
4797 * Take care of the second rule: */
4801 if (n && n->type == NCMD
4802 && n->ncmd.args && strcmp(n->ncmd.args->narg.text, "jobs") == 0
4804 TRACE(("Job hack\n"));
4805 /* "jobs": we do not want to clear job list for it,
4806 * instead we remove only _its_ own_ job from job list.
4807 * This makes "jobs .... | cat" more useful.
4813 for (jp = curjob; jp; jp = jp->prev_job)
4818 /* Called after fork(), in parent */
4820 #define forkparent(jp, n, mode, pid) forkparent(jp, mode, pid)
4823 forkparent(struct job *jp, union node *n, int mode, pid_t pid)
4825 TRACE(("In parent shell: child = %d\n", pid));
4827 while (jobless && dowait(DOWAIT_NONBLOCK, NULL) > 0)
4833 if (mode != FORK_NOJOB && jp->jobctl) {
4836 if (jp->nprocs == 0)
4839 pgrp = jp->ps[0].ps_pid;
4840 /* This can fail because we are doing it in the child also */
4844 if (mode == FORK_BG) {
4845 backgndpid = pid; /* set $! */
4846 set_curjob(jp, CUR_RUNNING);
4849 struct procstat *ps = &jp->ps[jp->nprocs++];
4852 ps->ps_cmd = nullstr;
4854 if (doing_jobctl && n)
4855 ps->ps_cmd = commandtext(n);
4861 forkshell(struct job *jp, union node *n, int mode)
4865 TRACE(("forkshell(%%%d, %p, %d) called\n", jobno(jp), n, mode));
4868 TRACE(("Fork failed, errno=%d", errno));
4871 ash_msg_and_raise_error("can't fork");
4874 CLEAR_RANDOM_T(&random_gen); /* or else $RANDOM repeats in child */
4875 forkchild(jp, n, mode);
4877 forkparent(jp, n, mode, pid);
4883 * Wait for job to finish.
4885 * Under job control we have the problem that while a child process
4886 * is running interrupts generated by the user are sent to the child
4887 * but not to the shell. This means that an infinite loop started by
4888 * an interactive user may be hard to kill. With job control turned off,
4889 * an interactive user may place an interactive program inside a loop.
4890 * If the interactive program catches interrupts, the user doesn't want
4891 * these interrupts to also abort the loop. The approach we take here
4892 * is to have the shell ignore interrupt signals while waiting for a
4893 * foreground process to terminate, and then send itself an interrupt
4894 * signal if the child process was terminated by an interrupt signal.
4895 * Unfortunately, some programs want to do a bit of cleanup and then
4896 * exit on interrupt; unless these processes terminate themselves by
4897 * sending a signal to themselves (instead of calling exit) they will
4898 * confuse this approach.
4900 * Called with interrupts off.
4903 waitforjob(struct job *jp)
4907 TRACE(("waitforjob(%%%d) called\n", jobno(jp)));
4910 while (jp->state == JOBRUNNING) {
4911 /* In non-interactive shells, we _can_ get
4912 * a keyboard signal here and be EINTRed,
4913 * but we just loop back, waiting for command to complete.
4916 * "If bash is waiting for a command to complete and receives
4917 * a signal for which a trap has been set, the trap
4918 * will not be executed until the command completes."
4920 * Reality is that even if trap is not set, bash
4921 * will not act on the signal until command completes.
4922 * Try this. sleep5intoff.c:
4923 * #include <signal.h>
4924 * #include <unistd.h>
4927 * sigemptyset(&set);
4928 * sigaddset(&set, SIGINT);
4929 * sigaddset(&set, SIGQUIT);
4930 * sigprocmask(SIG_BLOCK, &set, NULL);
4934 * $ bash -c './sleep5intoff; echo hi'
4935 * ^C^C^C^C <--- pressing ^C once a second
4937 * $ bash -c './sleep5intoff; echo hi'
4938 * ^\^\^\^\hi <--- pressing ^\ (SIGQUIT)
4941 dowait(DOWAIT_BLOCK, jp);
4948 xtcsetpgrp(ttyfd, rootpid);
4950 * This is truly gross.
4951 * If we're doing job control, then we did a TIOCSPGRP which
4952 * caused us (the shell) to no longer be in the controlling
4953 * session -- so we wouldn't have seen any ^C/SIGINT. So, we
4954 * intuit from the subprocess exit status whether a SIGINT
4955 * occurred, and if so interrupt ourselves. Yuck. - mycroft
4957 if (jp->sigint) /* TODO: do the same with all signals */
4958 raise(SIGINT); /* ... by raise(jp->sig) instead? */
4960 if (jp->state == JOBDONE)
4967 * return 1 if there are stopped jobs, otherwise 0
4979 if (jp && jp->state == JOBSTOPPED) {
4980 out2str("You have stopped jobs.\n");
4989 /* ============ redir.c
4991 * Code for dealing with input/output redirection.
4996 #define EMPTY -2 /* marks an unused slot in redirtab */
4997 #define CLOSED -3 /* marks a slot of previously-closed fd */
5000 * Open a file in noclobber mode.
5001 * The code was copied from bash.
5004 noclobberopen(const char *fname)
5007 struct stat finfo, finfo2;
5010 * If the file exists and is a regular file, return an error
5013 r = stat(fname, &finfo);
5014 if (r == 0 && S_ISREG(finfo.st_mode)) {
5020 * If the file was not present (r != 0), make sure we open it
5021 * exclusively so that if it is created before we open it, our open
5022 * will fail. Make sure that we do not truncate an existing file.
5023 * Note that we don't turn on O_EXCL unless the stat failed -- if the
5024 * file was not a regular file, we leave O_EXCL off.
5027 return open(fname, O_WRONLY|O_CREAT|O_EXCL, 0666);
5028 fd = open(fname, O_WRONLY|O_CREAT, 0666);
5030 /* If the open failed, return the file descriptor right away. */
5035 * OK, the open succeeded, but the file may have been changed from a
5036 * non-regular file to a regular file between the stat and the open.
5037 * We are assuming that the O_EXCL open handles the case where FILENAME
5038 * did not exist and is symlinked to an existing file between the stat
5043 * If we can open it and fstat the file descriptor, and neither check
5044 * revealed that it was a regular file, and the file has not been
5045 * replaced, return the file descriptor.
5047 if (fstat(fd, &finfo2) == 0
5048 && !S_ISREG(finfo2.st_mode)
5049 && finfo.st_dev == finfo2.st_dev
5050 && finfo.st_ino == finfo2.st_ino
5055 /* The file has been replaced. badness. */
5062 * Handle here documents. Normally we fork off a process to write the
5063 * data to a pipe. If the document is short, we can stuff the data in
5064 * the pipe without forking.
5066 /* openhere needs this forward reference */
5067 static void expandhere(union node *arg, int fd);
5069 openhere(union node *redir)
5075 ash_msg_and_raise_error("pipe call failed");
5076 if (redir->type == NHERE) {
5077 len = strlen(redir->nhere.doc->narg.text);
5078 if (len <= PIPE_BUF) {
5079 full_write(pip[1], redir->nhere.doc->narg.text, len);
5083 if (forkshell((struct job *)NULL, (union node *)NULL, FORK_NOJOB) == 0) {
5086 ignoresig(SIGINT); //signal(SIGINT, SIG_IGN);
5087 ignoresig(SIGQUIT); //signal(SIGQUIT, SIG_IGN);
5088 ignoresig(SIGHUP); //signal(SIGHUP, SIG_IGN);
5089 ignoresig(SIGTSTP); //signal(SIGTSTP, SIG_IGN);
5090 signal(SIGPIPE, SIG_DFL);
5091 if (redir->type == NHERE)
5092 full_write(pip[1], redir->nhere.doc->narg.text, len);
5094 expandhere(redir->nhere.doc, pip[1]);
5095 _exit(EXIT_SUCCESS);
5103 openredirect(union node *redir)
5108 switch (redir->nfile.type) {
5110 fname = redir->nfile.expfname;
5111 f = open(fname, O_RDONLY);
5116 fname = redir->nfile.expfname;
5117 f = open(fname, O_RDWR|O_CREAT, 0666);
5122 #if ENABLE_ASH_BASH_COMPAT
5125 /* Take care of noclobber mode. */
5127 fname = redir->nfile.expfname;
5128 f = noclobberopen(fname);
5135 fname = redir->nfile.expfname;
5136 f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666);
5141 fname = redir->nfile.expfname;
5142 f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666);
5150 /* Fall through to eliminate warning. */
5151 /* Our single caller does this itself */
5158 f = openhere(redir);
5164 ash_msg_and_raise_error("can't create %s: %s", fname, errmsg(errno, "nonexistent directory"));
5166 ash_msg_and_raise_error("can't open %s: %s", fname, errmsg(errno, "no such file"));
5170 * Copy a file descriptor to be >= to. Returns -1
5171 * if the source file descriptor is closed, EMPTY if there are no unused
5172 * file descriptors left.
5174 /* 0x800..00: bit to set in "to" to request dup2 instead of fcntl(F_DUPFD).
5175 * old code was doing close(to) prior to copyfd() to achieve the same */
5177 COPYFD_EXACT = (int)~(INT_MAX),
5178 COPYFD_RESTORE = (int)((unsigned)COPYFD_EXACT >> 1),
5181 copyfd(int from, int to)
5185 if (to & COPYFD_EXACT) {
5186 to &= ~COPYFD_EXACT;
5188 newfd = dup2(from, to);
5190 newfd = fcntl(from, F_DUPFD, to);
5193 if (errno == EMFILE)
5195 /* Happens when source fd is not open: try "echo >&99" */
5196 ash_msg_and_raise_error("%d: %m", from);
5201 /* Struct def and variable are moved down to the first usage site */
5206 struct redirtab *next;
5209 struct two_fd_t two_fd[];
5211 #define redirlist (G_var.redirlist)
5213 static int need_to_remember(struct redirtab *rp, int fd)
5217 if (!rp) /* remembering was not requested */
5220 for (i = 0; i < rp->pair_count; i++) {
5221 if (rp->two_fd[i].orig == fd) {
5222 /* already remembered */
5229 /* "hidden" fd is a fd used to read scripts, or a copy of such */
5230 static int is_hidden_fd(struct redirtab *rp, int fd)
5233 struct parsefile *pf;
5237 /* Check open scripts' fds */
5240 /* We skip pf_fd == 0 case because of the following case:
5241 * $ ash # running ash interactively
5243 * and in script.sh: "exec 9>&0".
5244 * Even though top-level pf_fd _is_ 0,
5245 * it's still ok to use it: "read" builtin uses it,
5246 * why should we cripple "exec" builtin?
5248 if (pf->pf_fd > 0 && fd == pf->pf_fd) {
5256 /* Check saved fds of redirects */
5257 fd |= COPYFD_RESTORE;
5258 for (i = 0; i < rp->pair_count; i++) {
5259 if (rp->two_fd[i].copy == fd) {
5267 * Process a list of redirection commands. If the REDIR_PUSH flag is set,
5268 * old file descriptors are stashed away so that the redirection can be
5269 * undone by calling popredir.
5271 /* flags passed to redirect */
5272 #define REDIR_PUSH 01 /* save previous values of file descriptors */
5273 #define REDIR_SAVEFD2 03 /* set preverrout */
5275 redirect(union node *redir, int flags)
5277 struct redirtab *sv;
5282 int copied_fd2 = -1;
5292 if (flags & REDIR_PUSH) {
5293 union node *tmp = redir;
5296 #if ENABLE_ASH_BASH_COMPAT
5297 if (tmp->nfile.type == NTO2)
5300 tmp = tmp->nfile.next;
5302 sv = ckmalloc(sizeof(*sv) + sv_pos * sizeof(sv->two_fd[0]));
5303 sv->next = redirlist;
5304 sv->pair_count = sv_pos;
5306 sv->nullredirs = g_nullredirs - 1;
5308 while (sv_pos > 0) {
5310 sv->two_fd[sv_pos].orig = sv->two_fd[sv_pos].copy = EMPTY;
5316 fd = redir->nfile.fd;
5317 if (redir->nfile.type == NTOFD || redir->nfile.type == NFROMFD) {
5318 right_fd = redir->ndup.dupfd;
5319 //bb_error_msg("doing %d > %d", fd, right_fd);
5320 /* redirect from/to same file descriptor? */
5323 /* "echo >&10" and 10 is a fd opened to a sh script? */
5324 if (is_hidden_fd(sv, right_fd)) {
5325 errno = EBADF; /* as if it is closed */
5326 ash_msg_and_raise_error("%d: %m", right_fd);
5330 newfd = openredirect(redir); /* always >= 0 */
5332 /* Descriptor wasn't open before redirect.
5333 * Mark it for close in the future */
5334 if (need_to_remember(sv, fd)) {
5335 goto remember_to_close;
5340 #if ENABLE_ASH_BASH_COMPAT
5343 if (need_to_remember(sv, fd)) {
5344 /* Copy old descriptor */
5345 /* Careful to not accidentally "save"
5346 * to the same fd as right side fd in N>&M */
5347 int minfd = right_fd < 10 ? 10 : right_fd + 1;
5348 i = fcntl(fd, F_DUPFD, minfd);
5349 /* You'd expect copy to be CLOEXECed. Currently these extra "saved" fds
5350 * are closed in popredir() in the child, preventing them from leaking
5351 * into child. (popredir() also cleans up the mess in case of failures)
5356 /* Strange error (e.g. "too many files" EMFILE?) */
5360 ash_msg_and_raise_error("%d: %m", fd);
5363 /* EBADF: it is not open - good, remember to close it */
5366 } else { /* fd is open, save its copy */
5367 /* "exec fd>&-" should not close fds
5368 * which point to script file(s).
5369 * Force them to be restored afterwards */
5370 if (is_hidden_fd(sv, fd))
5371 i |= COPYFD_RESTORE;
5375 sv->two_fd[sv_pos].orig = fd;
5376 sv->two_fd[sv_pos].copy = i;
5380 /* NTOFD/NFROMFD: copy redir->ndup.dupfd to fd */
5381 if (redir->ndup.dupfd < 0) { /* "fd>&-" */
5382 /* Don't want to trigger debugging */
5386 copyfd(redir->ndup.dupfd, fd | COPYFD_EXACT);
5388 } else if (fd != newfd) { /* move newfd to fd */
5389 copyfd(newfd, fd | COPYFD_EXACT);
5390 #if ENABLE_ASH_BASH_COMPAT
5391 if (!(redir->nfile.type == NTO2 && fd == 2))
5395 #if ENABLE_ASH_BASH_COMPAT
5396 if (redir->nfile.type == NTO2 && fd == 1) {
5397 /* We already redirected it to fd 1, now copy it to 2 */
5403 } while ((redir = redir->nfile.next) != NULL);
5406 if ((flags & REDIR_SAVEFD2) && copied_fd2 >= 0)
5407 preverrout_fd = copied_fd2;
5411 * Undo the effects of the last redirection.
5414 popredir(int drop, int restore)
5416 struct redirtab *rp;
5419 if (--g_nullredirs >= 0)
5423 for (i = 0; i < rp->pair_count; i++) {
5424 int fd = rp->two_fd[i].orig;
5425 int copy = rp->two_fd[i].copy;
5426 if (copy == CLOSED) {
5431 if (copy != EMPTY) {
5432 if (!drop || (restore && (copy & COPYFD_RESTORE))) {
5433 copy &= ~COPYFD_RESTORE;
5435 copyfd(copy, fd | COPYFD_EXACT);
5437 close(copy & ~COPYFD_RESTORE);
5440 redirlist = rp->next;
5441 g_nullredirs = rp->nullredirs;
5447 * Undo all redirections. Called on error or interrupt.
5451 * Discard all saved file descriptors.
5454 clearredir(int drop)
5460 popredir(drop, /*restore:*/ 0);
5465 redirectsafe(union node *redir, int flags)
5468 volatile int saveint;
5469 struct jmploc *volatile savehandler = exception_handler;
5470 struct jmploc jmploc;
5473 /* "echo 9>/dev/null; echo >&9; echo result: $?" - result should be 1, not 2! */
5474 err = setjmp(jmploc.loc); // huh?? was = setjmp(jmploc.loc) * 2;
5476 exception_handler = &jmploc;
5477 redirect(redir, flags);
5479 exception_handler = savehandler;
5480 if (err && exception_type != EXERROR)
5481 longjmp(exception_handler->loc, 1);
5482 RESTORE_INT(saveint);
5487 /* ============ Routines to expand arguments to commands
5489 * We have to deal with backquotes, shell variables, and file metacharacters.
5492 #if ENABLE_SH_MATH_SUPPORT
5494 ash_arith(const char *s)
5496 arith_state_t math_state;
5499 math_state.lookupvar = lookupvar;
5500 math_state.setvar = setvar2;
5501 //math_state.endofname = endofname;
5504 result = arith(&math_state, s);
5505 if (math_state.errmsg)
5506 ash_msg_and_raise_error(math_state.errmsg);
5516 #define EXP_FULL 0x1 /* perform word splitting & file globbing */
5517 #define EXP_TILDE 0x2 /* do normal tilde expansion */
5518 #define EXP_VARTILDE 0x4 /* expand tildes in an assignment */
5519 #define EXP_REDIR 0x8 /* file glob for a redirection (1 match only) */
5520 #define EXP_CASE 0x10 /* keeps quotes around for CASE pattern */
5521 #define EXP_RECORD 0x20 /* need to record arguments for ifs breakup */
5522 #define EXP_VARTILDE2 0x40 /* expand tildes after colons only */
5523 #define EXP_WORD 0x80 /* expand word in parameter expansion */
5524 #define EXP_QWORD 0x100 /* expand word in quoted parameter expansion */
5528 #define RMESCAPE_ALLOC 0x1 /* Allocate a new string */
5529 #define RMESCAPE_GLOB 0x2 /* Add backslashes for glob */
5530 #define RMESCAPE_QUOTED 0x4 /* Remove CTLESC unless in quotes */
5531 #define RMESCAPE_GROW 0x8 /* Grow strings instead of stalloc */
5532 #define RMESCAPE_HEAP 0x10 /* Malloc strings instead of stalloc */
5535 * Structure specifying which parts of the string should be searched
5536 * for IFS characters.
5539 struct ifsregion *next; /* next region in list */
5540 int begoff; /* offset of start of region */
5541 int endoff; /* offset of end of region */
5542 int nulonly; /* search for nul bytes only */
5546 struct strlist *list;
5547 struct strlist **lastp;
5550 /* output of current string */
5551 static char *expdest;
5552 /* list of back quote expressions */
5553 static struct nodelist *argbackq;
5554 /* first struct in list of ifs regions */
5555 static struct ifsregion ifsfirst;
5556 /* last struct in list */
5557 static struct ifsregion *ifslastp;
5558 /* holds expanded arg list */
5559 static struct arglist exparg;
5564 #if !ENABLE_SH_MATH_SUPPORT
5565 /* cvtnum() is used even if math support is off (to prepare $? values and such) */
5566 typedef long arith_t;
5567 # define ARITH_FMT "%ld"
5574 expdest = makestrspace(32, expdest);
5575 len = fmtstr(expdest, 32, ARITH_FMT, num);
5576 STADJUST(len, expdest);
5581 esclen(const char *start, const char *p)
5585 while (p > start && (unsigned char)*--p == CTLESC) {
5592 * Remove any CTLESC characters from a string.
5595 rmescapes(char *str, int flag)
5597 static const char qchars[] ALIGN1 = { CTLESC, CTLQUOTEMARK, '\0' };
5601 unsigned protect_against_glob;
5604 p = strpbrk(str, qchars);
5610 if (flag & RMESCAPE_ALLOC) {
5611 size_t len = p - str;
5612 size_t fulllen = len + strlen(p) + 1;
5614 if (flag & RMESCAPE_GROW) {
5615 int strloc = str - (char *)stackblock();
5616 r = makestrspace(fulllen, expdest);
5617 /* p and str may be invalidated by makestrspace */
5618 str = (char *)stackblock() + strloc;
5620 } else if (flag & RMESCAPE_HEAP) {
5621 r = ckmalloc(fulllen);
5623 r = stalloc(fulllen);
5627 q = (char *)memcpy(q, str, len) + len;
5631 inquotes = (flag & RMESCAPE_QUOTED) ^ RMESCAPE_QUOTED;
5632 globbing = flag & RMESCAPE_GLOB;
5633 protect_against_glob = globbing;
5635 if ((unsigned char)*p == CTLQUOTEMARK) {
5636 // TODO: if no RMESCAPE_QUOTED in flags, inquotes never becomes 0
5637 // (alternates between RMESCAPE_QUOTED and ~RMESCAPE_QUOTED). Is it ok?
5638 // Note: both inquotes and protect_against_glob only affect whether
5639 // CTLESC,<ch> gets converted to <ch> or to \<ch>
5640 inquotes = ~inquotes;
5642 protect_against_glob = globbing;
5646 /* naked back slash */
5647 protect_against_glob = 0;
5650 if ((unsigned char)*p == CTLESC) {
5652 if (protect_against_glob && inquotes && *p != '/') {
5656 protect_against_glob = globbing;
5661 if (flag & RMESCAPE_GROW) {
5663 STADJUST(q - r + 1, expdest);
5667 #define pmatch(a, b) !fnmatch((a), (b), 0)
5670 * Prepare a pattern for a expmeta (internal glob(3)) call.
5672 * Returns an stalloced string.
5675 preglob(const char *pattern, int quoted, int flag)
5677 flag |= RMESCAPE_GLOB;
5679 flag |= RMESCAPE_QUOTED;
5681 return rmescapes((char *)pattern, flag);
5685 * Put a string on the stack.
5688 memtodest(const char *p, size_t len, int syntax, int quotes)
5692 q = makestrspace(quotes ? len * 2 : len, q);
5695 unsigned char c = *p++;
5699 int n = SIT(c, syntax);
5700 if (n == CCTL || n == CBACK)
5710 strtodest(const char *p, int syntax, int quotes)
5712 memtodest(p, strlen(p), syntax, quotes);
5716 * Record the fact that we have to scan this region of the
5717 * string for IFS characters.
5720 recordregion(int start, int end, int nulonly)
5722 struct ifsregion *ifsp;
5724 if (ifslastp == NULL) {
5728 ifsp = ckzalloc(sizeof(*ifsp));
5729 /*ifsp->next = NULL; - ckzalloc did it */
5730 ifslastp->next = ifsp;
5734 ifslastp->begoff = start;
5735 ifslastp->endoff = end;
5736 ifslastp->nulonly = nulonly;
5740 removerecordregions(int endoff)
5742 if (ifslastp == NULL)
5745 if (ifsfirst.endoff > endoff) {
5746 while (ifsfirst.next) {
5747 struct ifsregion *ifsp;
5749 ifsp = ifsfirst.next->next;
5750 free(ifsfirst.next);
5751 ifsfirst.next = ifsp;
5754 if (ifsfirst.begoff > endoff) {
5757 ifslastp = &ifsfirst;
5758 ifsfirst.endoff = endoff;
5763 ifslastp = &ifsfirst;
5764 while (ifslastp->next && ifslastp->next->begoff < endoff)
5765 ifslastp = ifslastp->next;
5766 while (ifslastp->next) {
5767 struct ifsregion *ifsp;
5769 ifsp = ifslastp->next->next;
5770 free(ifslastp->next);
5771 ifslastp->next = ifsp;
5774 if (ifslastp->endoff > endoff)
5775 ifslastp->endoff = endoff;
5779 exptilde(char *startp, char *p, int flags)
5785 int quotes = flags & (EXP_FULL | EXP_CASE | EXP_REDIR);
5790 while ((c = *++p) != '\0') {
5797 if (flags & EXP_VARTILDE)
5807 if (*name == '\0') {
5808 home = lookupvar("HOME");
5810 pw = getpwnam(name);
5815 if (!home || !*home)
5818 startloc = expdest - (char *)stackblock();
5819 strtodest(home, SQSYNTAX, quotes);
5820 recordregion(startloc, expdest - (char *)stackblock(), 0);
5828 * Execute a command inside back quotes. If it's a builtin command, we
5829 * want to save its output in a block obtained from malloc. Otherwise
5830 * we fork off a subprocess and get the output of the command via a pipe.
5831 * Should be called with interrupts off.
5833 struct backcmd { /* result of evalbackcmd */
5834 int fd; /* file descriptor to read from */
5835 int nleft; /* number of chars in buffer */
5836 char *buf; /* buffer */
5837 struct job *jp; /* job structure for command */
5840 /* These forward decls are needed to use "eval" code for backticks handling: */
5841 static uint8_t back_exitstatus; /* exit status of backquoted command */
5842 #define EV_EXIT 01 /* exit after evaluating tree */
5843 static void evaltree(union node *, int);
5845 static void FAST_FUNC
5846 evalbackcmd(union node *n, struct backcmd *result)
5857 saveherefd = herefd;
5865 ash_msg_and_raise_error("pipe call failed");
5866 jp = makejob(/*n,*/ 1);
5867 if (forkshell(jp, n, FORK_NOJOB) == 0) {
5872 copyfd(pip[1], 1 | COPYFD_EXACT);
5876 evaltree(n, EV_EXIT); /* actually evaltreenr... */
5880 result->fd = pip[0];
5883 herefd = saveherefd;
5885 TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n",
5886 result->fd, result->buf, result->nleft, result->jp));
5890 * Expand stuff in backwards quotes.
5893 expbackq(union node *cmd, int quoted, int quotes)
5901 int syntax = quoted ? DQSYNTAX : BASESYNTAX;
5902 struct stackmark smark;
5905 setstackmark(&smark);
5907 startloc = dest - (char *)stackblock();
5909 evalbackcmd(cmd, &in);
5910 popstackmark(&smark);
5917 memtodest(p, i, syntax, quotes);
5921 i = nonblock_safe_read(in.fd, buf, sizeof(buf));
5922 TRACE(("expbackq: read returns %d\n", i));
5931 back_exitstatus = waitforjob(in.jp);
5935 /* Eat all trailing newlines */
5937 for (; dest > (char *)stackblock() && dest[-1] == '\n';)
5942 recordregion(startloc, dest - (char *)stackblock(), 0);
5943 TRACE(("evalbackq: size:%d:'%.*s'\n",
5944 (int)((dest - (char *)stackblock()) - startloc),
5945 (int)((dest - (char *)stackblock()) - startloc),
5946 stackblock() + startloc));
5949 #if ENABLE_SH_MATH_SUPPORT
5951 * Expand arithmetic expression. Backup to start of expression,
5952 * evaluate, place result in (backed up) result, adjust string position.
5965 * This routine is slightly over-complicated for
5966 * efficiency. Next we scan backwards looking for the
5967 * start of arithmetic.
5969 start = stackblock();
5976 while ((unsigned char)*p != CTLARI) {
5980 ash_msg_and_raise_error("missing CTLARI (shouldn't happen)");
5985 esc = esclen(start, p);
5995 removerecordregions(begoff);
6002 rmescapes(p + 2, 0);
6004 len = cvtnum(ash_arith(p + 2));
6007 recordregion(begoff, begoff + len, 0);
6011 /* argstr needs it */
6012 static char *evalvar(char *p, int flags, struct strlist *var_str_list);
6015 * Perform variable and command substitution. If EXP_FULL is set, output CTLESC
6016 * characters to allow for further processing. Otherwise treat
6017 * $@ like $* since no splitting will be performed.
6019 * var_str_list (can be NULL) is a list of "VAR=val" strings which take precedence
6020 * over shell varables. Needed for "A=a B=$A; echo $B" case - we use it
6021 * for correct expansion of "B=$A" word.
6024 argstr(char *p, int flags, struct strlist *var_str_list)
6026 static const char spclchars[] ALIGN1 = {
6034 CTLBACKQ | CTLQUOTE,
6035 #if ENABLE_SH_MATH_SUPPORT
6040 const char *reject = spclchars;
6041 int quotes = flags & (EXP_FULL | EXP_CASE | EXP_REDIR); /* do CTLESC */
6042 int breakall = flags & EXP_WORD;
6047 if (!(flags & EXP_VARTILDE)) {
6049 } else if (flags & EXP_VARTILDE2) {
6054 if (flags & EXP_TILDE) {
6057 flags &= ~EXP_TILDE;
6060 if ((unsigned char)*q == CTLESC && (flags & EXP_QWORD))
6063 p = exptilde(p, q, flags);
6066 startloc = expdest - (char *)stackblock();
6070 length += strcspn(p + length, reject);
6074 IF_SH_MATH_SUPPORT(|| c == CTLENDARI)
6076 /* c == '=' || c == ':' || c == CTLENDARI */
6082 expdest = stack_nputstr(p, length, expdest);
6083 newloc = expdest - (char *)stackblock();
6084 if (breakall && !inquotes && newloc > startloc) {
6085 recordregion(startloc, newloc, 0);
6096 if (flags & EXP_VARTILDE2) {
6100 flags |= EXP_VARTILDE2;
6105 * sort of a hack - expand tildes in variable
6106 * assignments (after the first '=' and after ':'s).
6115 case CTLENDVAR: /* ??? */
6118 /* "$@" syntax adherence hack */
6120 && memcmp(p, dolatstr, 4) == 0
6121 && ( p[4] == (char)CTLQUOTEMARK
6122 || (p[4] == (char)CTLENDVAR && p[5] == (char)CTLQUOTEMARK)
6125 p = evalvar(p + 1, flags, /* var_str_list: */ NULL) + 1;
6128 inquotes = !inquotes;
6141 p = evalvar(p, flags, var_str_list);
6145 case CTLBACKQ|CTLQUOTE:
6146 expbackq(argbackq->n, c, quotes);
6147 argbackq = argbackq->next;
6149 #if ENABLE_SH_MATH_SUPPORT
6161 scanleft(char *startp, char *rmesc, char *rmescend UNUSED_PARAM,
6162 char *pattern, int quotes, int zero)
6171 const char *s = loc2;
6178 match = pmatch(pattern, s);
6183 if (quotes && (unsigned char)*loc == CTLESC)
6192 scanright(char *startp, char *rmesc, char *rmescend,
6193 char *pattern, int quotes, int match_at_start)
6195 #if !ENABLE_ASH_OPTIMIZE_FOR_SIZE
6196 int try2optimize = match_at_start;
6202 /* If we called by "${v/pattern/repl}" or "${v//pattern/repl}":
6203 * startp="escaped_value_of_v" rmesc="raw_value_of_v"
6204 * rmescend=""(ptr to NUL in rmesc) pattern="pattern" quotes=match_at_start=1
6206 * loc starts at NUL at the end of startp, loc2 starts at the end of rmesc,
6207 * and on each iteration they go back two/one char until they reach the beginning.
6208 * We try to find a match in "raw_value_of_v", "raw_value_of_", "raw_value_of" etc.
6210 /* TODO: document in what other circumstances we are called. */
6212 for (loc = pattern - 1, loc2 = rmescend; loc >= startp; loc2--) {
6215 const char *s = loc2;
6216 if (match_at_start) {
6220 match = pmatch(pattern, s);
6221 //bb_error_msg("pmatch(pattern:'%s',s:'%s'):%d", pattern, s, match);
6225 #if !ENABLE_ASH_OPTIMIZE_FOR_SIZE
6227 /* Maybe we can optimize this:
6228 * if pattern ends with unescaped *, we can avoid checking
6229 * shorter strings: if "foo*" doesnt match "raw_value_of_v",
6230 * it wont match truncated "raw_value_of_" strings too.
6232 unsigned plen = strlen(pattern);
6233 /* Does it end with "*"? */
6234 if (plen != 0 && pattern[--plen] == '*') {
6235 /* "xxxx*" is not escaped */
6236 /* "xxx\*" is escaped */
6237 /* "xx\\*" is not escaped */
6238 /* "x\\\*" is escaped */
6240 while (plen != 0 && pattern[--plen] == '\\')
6243 break; /* ends with unescaped "*" */
6251 esc = esclen(startp, loc);
6262 static void varunset(const char *, const char *, const char *, int) NORETURN;
6264 varunset(const char *end, const char *var, const char *umsg, int varflags)
6270 msg = "parameter not set";
6272 if ((unsigned char)*end == CTLENDVAR) {
6273 if (varflags & VSNUL)
6279 ash_msg_and_raise_error("%.*s: %s%s", (int)(end - var - 1), var, msg, tail);
6282 #if ENABLE_ASH_BASH_COMPAT
6284 parse_sub_pattern(char *arg, int varflags)
6286 char *idx, *repl = NULL;
6289 //char *org_arg = arg;
6290 //bb_error_msg("arg:'%s' varflags:%x", arg, varflags);
6297 /* Only the first '/' seen is our separator */
6306 * Example: v='ab\c'; echo ${v/\\b/_\\_\z_}
6307 * The result is a_\_z_c (not a\_\_z_c)!
6309 * Enable debug prints in this function and you'll see:
6310 * ash: arg:'\\b/_\\_z_' varflags:d
6311 * ash: pattern:'\\b' repl:'_\_z_'
6312 * That is, \\b is interpreted as \\b, but \\_ as \_!
6313 * IOW: search pattern and replace string treat backslashes
6314 * differently! That is the reason why we check repl below:
6316 if (c == '\\' && *arg == '\\' && repl && !(varflags & VSQUOTE))
6317 arg++; /* skip both '\', not just first one */
6320 //bb_error_msg("pattern:'%s' repl:'%s'", org_arg, repl);
6324 #endif /* ENABLE_ASH_BASH_COMPAT */
6327 subevalvar(char *p, char *varname, int strloc, int subtype,
6328 int startloc, int varflags, int quotes, struct strlist *var_str_list)
6330 struct nodelist *saveargbackq = argbackq;
6333 char *rmesc, *rmescend;
6335 IF_ASH_BASH_COMPAT(const char *repl = NULL;)
6336 IF_ASH_BASH_COMPAT(int pos, len, orig_len;)
6337 int saveherefd = herefd;
6338 int amount, workloc, resetloc;
6340 char *(*scan)(char*, char*, char*, char*, int, int);
6342 //bb_error_msg("subevalvar(p:'%s',varname:'%s',strloc:%d,subtype:%d,startloc:%d,varflags:%x,quotes:%d)",
6343 // p, varname, strloc, subtype, startloc, varflags, quotes);
6346 argstr(p, (subtype != VSASSIGN && subtype != VSQUESTION) ? EXP_CASE : 0,
6348 STPUTC('\0', expdest);
6349 herefd = saveherefd;
6350 argbackq = saveargbackq;
6351 startp = (char *)stackblock() + startloc;
6355 setvar(varname, startp, 0);
6356 amount = startp - expdest;
6357 STADJUST(amount, expdest);
6361 varunset(p, varname, startp, varflags);
6364 #if ENABLE_ASH_BASH_COMPAT
6366 loc = str = stackblock() + strloc;
6367 /* Read POS in ${var:POS:LEN} */
6368 pos = atoi(loc); /* number(loc) errors out on "1:4" */
6369 len = str - startp - 1;
6371 /* *loc != '\0', guaranteed by parser */
6375 /* Adjust the length by the number of escapes */
6376 for (ptr = startp; ptr < (str - 1); ptr++) {
6377 if ((unsigned char)*ptr == CTLESC) {
6385 if (*loc++ == ':') {
6389 /* Skip POS in ${var:POS:LEN} */
6391 while (*loc && *loc != ':') {
6393 * bash complains on: var=qwe; echo ${var:1a:123}
6395 ash_msg_and_raise_error(msg_illnum, str);
6399 if (*loc++ == ':') {
6403 if (pos >= orig_len) {
6407 if (len > (orig_len - pos))
6408 len = orig_len - pos;
6410 for (str = startp; pos; str++, pos--) {
6411 if (quotes && (unsigned char)*str == CTLESC)
6414 for (loc = startp; len; len--) {
6415 if (quotes && (unsigned char)*str == CTLESC)
6420 amount = loc - expdest;
6421 STADJUST(amount, expdest);
6426 resetloc = expdest - (char *)stackblock();
6428 /* We'll comeback here if we grow the stack while handling
6429 * a VSREPLACE or VSREPLACEALL, since our pointers into the
6430 * stack will need rebasing, and we'll need to remove our work
6433 IF_ASH_BASH_COMPAT(restart:)
6435 amount = expdest - ((char *)stackblock() + resetloc);
6436 STADJUST(-amount, expdest);
6437 startp = (char *)stackblock() + startloc;
6440 rmescend = (char *)stackblock() + strloc;
6442 rmesc = rmescapes(startp, RMESCAPE_ALLOC | RMESCAPE_GROW);
6443 if (rmesc != startp) {
6445 startp = (char *)stackblock() + startloc;
6449 str = (char *)stackblock() + strloc;
6450 preglob(str, varflags & VSQUOTE, 0);
6451 workloc = expdest - (char *)stackblock();
6453 #if ENABLE_ASH_BASH_COMPAT
6454 if (subtype == VSREPLACE || subtype == VSREPLACEALL) {
6458 repl = parse_sub_pattern(str, varflags);
6459 //bb_error_msg("repl:'%s'", repl);
6464 /* If there's no pattern to match, return the expansion unmolested */
6473 loc = scanright(idx, rmesc, rmescend, str, quotes, 1);
6474 //bb_error_msg("scanright('%s'):'%s'", str, loc);
6476 /* No match, advance */
6477 char *restart_detect = stackblock();
6479 STPUTC(*idx, expdest);
6480 if (quotes && (unsigned char)*idx == CTLESC) {
6483 STPUTC(*idx, expdest);
6485 if (stackblock() != restart_detect)
6490 /* continue; - prone to quadratic behavior, smarter code: */
6493 if (str[0] == '*') {
6494 /* Pattern is "*foo". If "*foo" does not match "long_string",
6495 * it would never match "ong_string" etc, no point in trying.
6502 if (subtype == VSREPLACEALL) {
6504 if (quotes && (unsigned char)*idx == CTLESC)
6513 //bb_error_msg("repl:'%s'", repl);
6514 for (loc = (char*)repl; *loc; loc++) {
6515 char *restart_detect = stackblock();
6516 if (quotes && *loc == '\\') {
6517 STPUTC(CTLESC, expdest);
6520 STPUTC(*loc, expdest);
6521 if (stackblock() != restart_detect)
6526 if (subtype == VSREPLACE) {
6527 //bb_error_msg("tail:'%s', quotes:%x", idx, quotes);
6529 char *restart_detect = stackblock();
6530 STPUTC(*idx, expdest);
6531 if (stackblock() != restart_detect)
6540 /* We've put the replaced text into a buffer at workloc, now
6541 * move it to the right place and adjust the stack.
6543 STPUTC('\0', expdest);
6544 startp = (char *)stackblock() + startloc;
6545 memmove(startp, (char *)stackblock() + workloc, len + 1);
6546 //bb_error_msg("startp:'%s'", startp);
6547 amount = expdest - (startp + len);
6548 STADJUST(-amount, expdest);
6551 #endif /* ENABLE_ASH_BASH_COMPAT */
6553 subtype -= VSTRIMRIGHT;
6555 if (subtype < 0 || subtype > 7)
6558 /* zero = (subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX) */
6559 zero = subtype >> 1;
6560 /* VSTRIMLEFT/VSTRIMRIGHTMAX -> scanleft */
6561 scan = (subtype & 1) ^ zero ? scanleft : scanright;
6563 loc = scan(startp, rmesc, rmescend, str, quotes, zero);
6566 memmove(startp, loc, str - loc);
6567 loc = startp + (str - loc) - 1;
6570 amount = loc - expdest;
6571 STADJUST(amount, expdest);
6577 * Add the value of a specialized variable to the stack string.
6578 * name parameter (examples):
6579 * ash -c 'echo $1' name:'1='
6580 * ash -c 'echo $qwe' name:'qwe='
6581 * ash -c 'echo $$' name:'$='
6582 * ash -c 'echo ${$}' name:'$='
6583 * ash -c 'echo ${$##q}' name:'$=q'
6584 * ash -c 'echo ${#$}' name:'$='
6585 * note: examples with bad shell syntax:
6586 * ash -c 'echo ${#$1}' name:'$=1'
6587 * ash -c 'echo ${#1#}' name:'1=#'
6589 static NOINLINE ssize_t
6590 varvalue(char *name, int varflags, int flags, struct strlist *var_str_list)
6597 int subtype = varflags & VSTYPE;
6598 int quotes = flags & (EXP_FULL | EXP_CASE | EXP_REDIR);
6599 int quoted = varflags & VSQUOTE;
6600 int syntax = quoted ? DQSYNTAX : BASESYNTAX;
6610 num = shellparam.nparam;
6618 goto check_1char_name;
6620 expdest = makestrspace(NOPTS, expdest);
6621 for (i = NOPTS - 1; i >= 0; i--) {
6623 USTPUTC(optletters(i), expdest);
6629 /* handles cases similar to ${#$1} */
6630 if (name[2] != '\0')
6631 raise_error_syntax("bad substitution");
6638 if (quoted && (flags & EXP_FULL)) {
6639 /* note: this is not meant as PEOF value */
6640 sep = 1 << CHAR_BIT;
6645 sep = ifsset() ? (unsigned char)(ifsval()[0]) : ' ';
6646 i = SIT(sep, syntax);
6647 if (quotes && (i == CCTL || i == CBACK))
6653 while ((p = *ap++) != NULL) {
6656 partlen = strlen(p);
6659 if (!(subtype == VSPLUS || subtype == VSLENGTH))
6660 memtodest(p, partlen, syntax, quotes);
6666 if (subtype == VSPLUS || subtype == VSLENGTH) {
6672 /* note: may put NUL despite sep != 0
6673 * (see sep = 1 << CHAR_BIT above) */
6679 } /* case '@' and '*' */
6690 num = atoi(name); /* number(name) fails on ${N#str} etc */
6691 if (num < 0 || num > shellparam.nparam)
6693 p = num ? shellparam.p[num - 1] : arg0;
6696 /* NB: name has form "VAR=..." */
6698 /* "A=a B=$A" case: var_str_list is a list of "A=a" strings
6699 * which should be considered before we check variables. */
6701 unsigned name_len = (strchrnul(name, '=') - name) + 1;
6705 str = var_str_list->text;
6706 eq = strchr(str, '=');
6707 if (!eq) /* stop at first non-assignment */
6710 if (name_len == (unsigned)(eq - str)
6711 && strncmp(str, name, name_len) == 0
6714 /* goto value; - WRONG! */
6715 /* think "A=1 A=2 B=$A" */
6717 var_str_list = var_str_list->next;
6718 } while (var_str_list);
6722 p = lookupvar(name);
6728 if (!(subtype == VSPLUS || subtype == VSLENGTH))
6729 memtodest(p, len, syntax, quotes);
6733 if (subtype == VSPLUS || subtype == VSLENGTH)
6734 STADJUST(-len, expdest);
6739 * Expand a variable, and return a pointer to the next character in the
6743 evalvar(char *p, int flags, struct strlist *var_str_list)
6754 varflags = (unsigned char) *p++;
6755 subtype = varflags & VSTYPE;
6756 quoted = varflags & VSQUOTE;
6758 easy = (!quoted || (*var == '@' && shellparam.nparam));
6759 startloc = expdest - (char *)stackblock();
6760 p = strchr(p, '=') + 1; //TODO: use var_end(p)?
6763 varlen = varvalue(var, varflags, flags, var_str_list);
6764 if (varflags & VSNUL)
6767 if (subtype == VSPLUS) {
6768 varlen = -1 - varlen;
6772 if (subtype == VSMINUS) {
6777 flags | (quoted ? EXP_TILDE|EXP_QWORD : EXP_TILDE|EXP_WORD),
6787 if (subtype == VSASSIGN || subtype == VSQUESTION) {
6789 if (subevalvar(p, var, /* strloc: */ 0,
6790 subtype, startloc, varflags,
6796 * Remove any recorded regions beyond
6799 removerecordregions(startloc);
6809 if (varlen < 0 && uflag)
6810 varunset(p, var, 0, 0);
6812 if (subtype == VSLENGTH) {
6813 cvtnum(varlen > 0 ? varlen : 0);
6817 if (subtype == VSNORMAL) {
6828 case VSTRIMRIGHTMAX:
6829 #if ENABLE_ASH_BASH_COMPAT
6842 * Terminate the string and start recording the pattern
6845 STPUTC('\0', expdest);
6846 patloc = expdest - (char *)stackblock();
6847 if (NULL == subevalvar(p, /* varname: */ NULL, patloc, subtype,
6849 //TODO: | EXP_REDIR too? All other such places do it too
6850 /* quotes: */ flags & (EXP_FULL | EXP_CASE),
6853 int amount = expdest - (
6854 (char *)stackblock() + patloc - 1
6856 STADJUST(-amount, expdest);
6858 /* Remove any recorded regions beyond start of variable */
6859 removerecordregions(startloc);
6861 recordregion(startloc, expdest - (char *)stackblock(), quoted);
6865 if (subtype != VSNORMAL) { /* skip to end of alternative */
6868 unsigned char c = *p++;
6871 else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) {
6873 argbackq = argbackq->next;
6874 } else if (c == CTLVAR) {
6875 if ((*p++ & VSTYPE) != VSNORMAL)
6877 } else if (c == CTLENDVAR) {
6887 * Break the argument string into pieces based upon IFS and add the
6888 * strings to the argument list. The regions of the string to be
6889 * searched for IFS characters have been stored by recordregion.
6892 ifsbreakup(char *string, struct arglist *arglist)
6894 struct ifsregion *ifsp;
6899 const char *ifs, *realifs;
6904 if (ifslastp != NULL) {
6907 realifs = ifsset() ? ifsval() : defifs;
6910 p = string + ifsp->begoff;
6911 nulonly = ifsp->nulonly;
6912 ifs = nulonly ? nullstr : realifs;
6914 while (p < string + ifsp->endoff) {
6916 if ((unsigned char)*p == CTLESC)
6918 if (!strchr(ifs, *p)) {
6923 ifsspc = (strchr(defifs, *p) != NULL);
6924 /* Ignore IFS whitespace at start */
6925 if (q == start && ifsspc) {
6931 sp = stzalloc(sizeof(*sp));
6933 *arglist->lastp = sp;
6934 arglist->lastp = &sp->next;
6938 if (p >= string + ifsp->endoff) {
6942 if ((unsigned char)*p == CTLESC)
6944 if (strchr(ifs, *p) == NULL) {
6948 if (strchr(defifs, *p) == NULL) {
6963 } while (ifsp != NULL);
6972 sp = stzalloc(sizeof(*sp));
6974 *arglist->lastp = sp;
6975 arglist->lastp = &sp->next;
6981 struct ifsregion *p;
6986 struct ifsregion *ifsp;
6992 ifsfirst.next = NULL;
6997 * Add a file name to the list.
7000 addfname(const char *name)
7004 sp = stzalloc(sizeof(*sp));
7005 sp->text = ststrdup(name);
7007 exparg.lastp = &sp->next;
7011 * Do metacharacter (i.e. *, ?, [...]) expansion.
7014 expmeta(char *expdir, char *enddir, char *name)
7029 for (p = name; *p; p++) {
7030 if (*p == '*' || *p == '?')
7032 else if (*p == '[') {
7039 if (*q == '/' || *q == '\0')
7046 } else if (*p == '\\')
7048 else if (*p == '/') {
7055 if (metaflag == 0) { /* we've reached the end of the file name */
7056 if (enddir != expdir)
7064 if (metaflag == 0 || lstat(expdir, &statb) >= 0)
7075 } while (p < start);
7077 if (enddir == expdir) {
7079 } else if (enddir == expdir + 1 && *expdir == '/') {
7088 if (enddir != expdir)
7090 if (*endname == 0) {
7102 while (!pending_int && (dp = readdir(dirp)) != NULL) {
7103 if (dp->d_name[0] == '.' && !matchdot)
7105 if (pmatch(start, dp->d_name)) {
7107 strcpy(enddir, dp->d_name);
7110 for (p = enddir, cp = dp->d_name; (*p++ = *cp++) != '\0';)
7113 expmeta(expdir, p, endname);
7122 static struct strlist *
7123 msort(struct strlist *list, int len)
7125 struct strlist *p, *q = NULL;
7126 struct strlist **lpp;
7134 for (n = half; --n >= 0;) {
7138 q->next = NULL; /* terminate first half of list */
7139 q = msort(list, half); /* sort first half of list */
7140 p = msort(p, len - half); /* sort second half */
7143 #if ENABLE_LOCALE_SUPPORT
7144 if (strcoll(p->text, q->text) < 0)
7146 if (strcmp(p->text, q->text) < 0)
7170 * Sort the results of file name expansion. It calculates the number of
7171 * strings to sort and then calls msort (short for merge sort) to do the
7174 static struct strlist *
7175 expsort(struct strlist *str)
7181 for (sp = str; sp; sp = sp->next)
7183 return msort(str, len);
7187 expandmeta(struct strlist *str /*, int flag*/)
7189 static const char metachars[] ALIGN1 = {
7192 /* TODO - EXP_REDIR */
7196 struct strlist **savelastp;
7202 if (!strpbrk(str->text, metachars))
7204 savelastp = exparg.lastp;
7207 p = preglob(str->text, 0, RMESCAPE_ALLOC | RMESCAPE_HEAP);
7209 int i = strlen(str->text);
7210 expdir = ckmalloc(i < 2048 ? 2048 : i); /* XXX */
7212 expmeta(expdir, expdir, p);
7217 if (exparg.lastp == savelastp) {
7222 *exparg.lastp = str;
7223 rmescapes(str->text, 0);
7224 exparg.lastp = &str->next;
7226 *exparg.lastp = NULL;
7227 *savelastp = sp = expsort(*savelastp);
7228 while (sp->next != NULL)
7230 exparg.lastp = &sp->next;
7237 * Perform variable substitution and command substitution on an argument,
7238 * placing the resulting list of arguments in arglist. If EXP_FULL is true,
7239 * perform splitting and file name expansion. When arglist is NULL, perform
7240 * here document expansion.
7243 expandarg(union node *arg, struct arglist *arglist, int flag)
7248 argbackq = arg->narg.backquote;
7249 STARTSTACKSTR(expdest);
7250 ifsfirst.next = NULL;
7252 argstr(arg->narg.text, flag,
7253 /* var_str_list: */ arglist ? arglist->list : NULL);
7254 p = _STPUTC('\0', expdest);
7256 if (arglist == NULL) {
7257 return; /* here document expanded */
7259 p = grabstackstr(p);
7260 exparg.lastp = &exparg.list;
7264 if (flag & EXP_FULL) {
7265 ifsbreakup(p, &exparg);
7266 *exparg.lastp = NULL;
7267 exparg.lastp = &exparg.list;
7268 expandmeta(exparg.list /*, flag*/);
7270 if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */
7272 sp = stzalloc(sizeof(*sp));
7275 exparg.lastp = &sp->next;
7279 *exparg.lastp = NULL;
7281 *arglist->lastp = exparg.list;
7282 arglist->lastp = exparg.lastp;
7287 * Expand shell variables and backquotes inside a here document.
7290 expandhere(union node *arg, int fd)
7293 expandarg(arg, (struct arglist *)NULL, 0);
7294 full_write(fd, stackblock(), expdest - (char *)stackblock());
7298 * Returns true if the pattern matches the string.
7301 patmatch(char *pattern, const char *string)
7303 return pmatch(preglob(pattern, 0, 0), string);
7307 * See if a pattern matches in a case statement.
7310 casematch(union node *pattern, char *val)
7312 struct stackmark smark;
7315 setstackmark(&smark);
7316 argbackq = pattern->narg.backquote;
7317 STARTSTACKSTR(expdest);
7319 argstr(pattern->narg.text, EXP_TILDE | EXP_CASE,
7320 /* var_str_list: */ NULL);
7321 STACKSTRNUL(expdest);
7322 result = patmatch(stackblock(), val);
7323 popstackmark(&smark);
7328 /* ============ find_command */
7332 int (*builtin)(int, char **) FAST_FUNC;
7333 /* unsigned flags; */
7335 #define IS_BUILTIN_SPECIAL(b) ((b)->name[0] & 1)
7336 /* "regular" builtins always take precedence over commands,
7337 * regardless of PATH=....%builtin... position */
7338 #define IS_BUILTIN_REGULAR(b) ((b)->name[0] & 2)
7339 #define IS_BUILTIN_ASSIGN(b) ((b)->name[0] & 4)
7342 smallint cmdtype; /* CMDxxx */
7345 /* index >= 0 for commands without path (slashes) */
7346 /* (TODO: what exactly does the value mean? PATH position?) */
7347 /* index == -1 for commands with slashes */
7348 /* index == (-2 - applet_no) for NOFORK applets */
7349 const struct builtincmd *cmd;
7350 struct funcnode *func;
7353 /* values of cmdtype */
7354 #define CMDUNKNOWN -1 /* no entry in table for command */
7355 #define CMDNORMAL 0 /* command is an executable program */
7356 #define CMDFUNCTION 1 /* command is a shell function */
7357 #define CMDBUILTIN 2 /* command is a shell builtin */
7359 /* action to find_command() */
7360 #define DO_ERR 0x01 /* prints errors */
7361 #define DO_ABS 0x02 /* checks absolute paths */
7362 #define DO_NOFUNC 0x04 /* don't return shell functions, for command */
7363 #define DO_ALTPATH 0x08 /* using alternate path */
7364 #define DO_ALTBLTIN 0x20 /* %builtin in alt. path */
7366 static void find_command(char *, struct cmdentry *, int, const char *);
7369 /* ============ Hashing commands */
7372 * When commands are first encountered, they are entered in a hash table.
7373 * This ensures that a full path search will not have to be done for them
7374 * on each invocation.
7376 * We should investigate converting to a linear search, even though that
7377 * would make the command name "hash" a misnomer.
7381 struct tblentry *next; /* next entry in hash chain */
7382 union param param; /* definition of builtin function */
7383 smallint cmdtype; /* CMDxxx */
7384 char rehash; /* if set, cd done since entry created */
7385 char cmdname[1]; /* name of command */
7388 static struct tblentry **cmdtable;
7389 #define INIT_G_cmdtable() do { \
7390 cmdtable = xzalloc(CMDTABLESIZE * sizeof(cmdtable[0])); \
7393 static int builtinloc = -1; /* index in path of %builtin, or -1 */
7397 tryexec(IF_FEATURE_SH_STANDALONE(int applet_no,) char *cmd, char **argv, char **envp)
7399 #if ENABLE_FEATURE_SH_STANDALONE
7400 if (applet_no >= 0) {
7401 if (APPLET_IS_NOEXEC(applet_no)) {
7405 run_applet_no_and_exit(applet_no, argv);
7407 /* re-exec ourselves with the new arguments */
7408 execve(bb_busybox_exec_path, argv, envp);
7409 /* If they called chroot or otherwise made the binary no longer
7410 * executable, fall through */
7417 execve(cmd, argv, envp);
7418 } while (errno == EINTR);
7420 execve(cmd, argv, envp);
7422 if (cmd == (char*) bb_busybox_exec_path) {
7423 /* We already visited ENOEXEC branch below, don't do it again */
7424 //TODO: try execve(initial_argv0_of_shell, argv, envp) before giving up?
7428 if (errno == ENOEXEC) {
7429 /* Run "cmd" as a shell script:
7430 * http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html
7431 * "If the execve() function fails with ENOEXEC, the shell
7432 * shall execute a command equivalent to having a shell invoked
7433 * with the command name as its first operand,
7434 * with any remaining arguments passed to the new shell"
7436 * That is, do not use $SHELL, user's shell, or /bin/sh;
7437 * just call ourselves.
7442 for (ap = argv; *ap; ap++)
7444 new = ckmalloc((ap - argv + 2) * sizeof(new[0]));
7445 new[0] = (char*) "ash";
7448 while ((*ap++ = *++argv) != NULL)
7450 cmd = (char*) bb_busybox_exec_path;
7457 * Exec a program. Never returns. If you change this routine, you may
7458 * have to change the find_command routine as well.
7460 static void shellexec(char **, const char *, int) NORETURN;
7462 shellexec(char **argv, const char *path, int idx)
7468 #if ENABLE_FEATURE_SH_STANDALONE
7472 clearredir(/*drop:*/ 1);
7473 envp = listvars(VEXPORT, VUNSET, /*end:*/ NULL);
7474 if (strchr(argv[0], '/') != NULL
7475 #if ENABLE_FEATURE_SH_STANDALONE
7476 || (applet_no = find_applet_by_name(argv[0])) >= 0
7479 tryexec(IF_FEATURE_SH_STANDALONE(applet_no,) argv[0], argv, envp);
7483 while ((cmdname = path_advance(&path, argv[0])) != NULL) {
7484 if (--idx < 0 && pathopt == NULL) {
7485 tryexec(IF_FEATURE_SH_STANDALONE(-1,) cmdname, argv, envp);
7486 if (errno != ENOENT && errno != ENOTDIR)
7493 /* Map to POSIX errors */
7505 exitstatus = exerrno;
7506 TRACE(("shellexec failed for %s, errno %d, suppress_int %d\n",
7507 argv[0], e, suppress_int));
7508 ash_msg_and_raise(EXEXEC, "%s: %s", argv[0], errmsg(e, "not found"));
7513 printentry(struct tblentry *cmdp)
7519 idx = cmdp->param.index;
7522 name = path_advance(&path, cmdp->cmdname);
7524 } while (--idx >= 0);
7525 out1fmt("%s%s\n", name, (cmdp->rehash ? "*" : nullstr));
7529 * Clear out command entries. The argument specifies the first entry in
7530 * PATH which has changed.
7533 clearcmdentry(int firstchange)
7535 struct tblentry **tblp;
7536 struct tblentry **pp;
7537 struct tblentry *cmdp;
7540 for (tblp = cmdtable; tblp < &cmdtable[CMDTABLESIZE]; tblp++) {
7542 while ((cmdp = *pp) != NULL) {
7543 if ((cmdp->cmdtype == CMDNORMAL &&
7544 cmdp->param.index >= firstchange)
7545 || (cmdp->cmdtype == CMDBUILTIN &&
7546 builtinloc >= firstchange)
7559 * Locate a command in the command hash table. If "add" is nonzero,
7560 * add the command to the table if it is not already present. The
7561 * variable "lastcmdentry" is set to point to the address of the link
7562 * pointing to the entry, so that delete_cmd_entry can delete the
7565 * Interrupts must be off if called with add != 0.
7567 static struct tblentry **lastcmdentry;
7569 static struct tblentry *
7570 cmdlookup(const char *name, int add)
7572 unsigned int hashval;
7574 struct tblentry *cmdp;
7575 struct tblentry **pp;
7578 hashval = (unsigned char)*p << 4;
7580 hashval += (unsigned char)*p++;
7582 pp = &cmdtable[hashval % CMDTABLESIZE];
7583 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7584 if (strcmp(cmdp->cmdname, name) == 0)
7588 if (add && cmdp == NULL) {
7589 cmdp = *pp = ckzalloc(sizeof(struct tblentry)
7591 /* + 1 - already done because
7592 * tblentry::cmdname is char[1] */);
7593 /*cmdp->next = NULL; - ckzalloc did it */
7594 cmdp->cmdtype = CMDUNKNOWN;
7595 strcpy(cmdp->cmdname, name);
7602 * Delete the command entry returned on the last lookup.
7605 delete_cmd_entry(void)
7607 struct tblentry *cmdp;
7610 cmdp = *lastcmdentry;
7611 *lastcmdentry = cmdp->next;
7612 if (cmdp->cmdtype == CMDFUNCTION)
7613 freefunc(cmdp->param.func);
7619 * Add a new command entry, replacing any existing command entry for
7620 * the same name - except special builtins.
7623 addcmdentry(char *name, struct cmdentry *entry)
7625 struct tblentry *cmdp;
7627 cmdp = cmdlookup(name, 1);
7628 if (cmdp->cmdtype == CMDFUNCTION) {
7629 freefunc(cmdp->param.func);
7631 cmdp->cmdtype = entry->cmdtype;
7632 cmdp->param = entry->u;
7636 static int FAST_FUNC
7637 hashcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
7639 struct tblentry **pp;
7640 struct tblentry *cmdp;
7642 struct cmdentry entry;
7645 if (nextopt("r") != '\0') {
7650 if (*argptr == NULL) {
7651 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
7652 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7653 if (cmdp->cmdtype == CMDNORMAL)
7661 while ((name = *argptr) != NULL) {
7662 cmdp = cmdlookup(name, 0);
7664 && (cmdp->cmdtype == CMDNORMAL
7665 || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))
7669 find_command(name, &entry, DO_ERR, pathval());
7670 if (entry.cmdtype == CMDUNKNOWN)
7678 * Called when a cd is done. Marks all commands so the next time they
7679 * are executed they will be rehashed.
7684 struct tblentry **pp;
7685 struct tblentry *cmdp;
7687 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
7688 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7689 if (cmdp->cmdtype == CMDNORMAL
7690 || (cmdp->cmdtype == CMDBUILTIN
7691 && !IS_BUILTIN_REGULAR(cmdp->param.cmd)
7701 * Fix command hash table when PATH changed.
7702 * Called before PATH is changed. The argument is the new value of PATH;
7703 * pathval() still returns the old value at this point.
7704 * Called with interrupts off.
7706 static void FAST_FUNC
7707 changepath(const char *new)
7715 firstchange = 9999; /* assume no change */
7721 if ((*old == '\0' && *new == ':')
7722 || (*old == ':' && *new == '\0')
7726 old = new; /* ignore subsequent differences */
7730 if (*new == '%' && idx_bltin < 0 && prefix(new + 1, "builtin"))
7737 if (builtinloc < 0 && idx_bltin >= 0)
7738 builtinloc = idx_bltin; /* zap builtins */
7739 if (builtinloc >= 0 && idx_bltin < 0)
7741 clearcmdentry(firstchange);
7742 builtinloc = idx_bltin;
7757 #define TENDBQUOTE 12
7774 typedef smallint token_id_t;
7776 /* first char is indicating which tokens mark the end of a list */
7777 static const char *const tokname_array[] = {
7791 #define KWDOFFSET 13
7792 /* the following are keywords */
7811 /* Wrapper around strcmp for qsort/bsearch/... */
7813 pstrcmp(const void *a, const void *b)
7815 return strcmp((char*) a, (*(char**) b) + 1);
7818 static const char *const *
7819 findkwd(const char *s)
7821 return bsearch(s, tokname_array + KWDOFFSET,
7822 ARRAY_SIZE(tokname_array) - KWDOFFSET,
7823 sizeof(tokname_array[0]), pstrcmp);
7827 * Locate and print what a word is...
7830 describe_command(char *command, int describe_command_verbose)
7832 struct cmdentry entry;
7833 struct tblentry *cmdp;
7834 #if ENABLE_ASH_ALIAS
7835 const struct alias *ap;
7837 const char *path = pathval();
7839 if (describe_command_verbose) {
7843 /* First look at the keywords */
7844 if (findkwd(command)) {
7845 out1str(describe_command_verbose ? " is a shell keyword" : command);
7849 #if ENABLE_ASH_ALIAS
7850 /* Then look at the aliases */
7851 ap = lookupalias(command, 0);
7853 if (!describe_command_verbose) {
7858 out1fmt(" is an alias for %s", ap->val);
7862 /* Then check if it is a tracked alias */
7863 cmdp = cmdlookup(command, 0);
7865 entry.cmdtype = cmdp->cmdtype;
7866 entry.u = cmdp->param;
7868 /* Finally use brute force */
7869 find_command(command, &entry, DO_ABS, path);
7872 switch (entry.cmdtype) {
7874 int j = entry.u.index;
7880 p = path_advance(&path, command);
7884 if (describe_command_verbose) {
7886 (cmdp ? " a tracked alias for" : nullstr), p
7895 if (describe_command_verbose) {
7896 out1str(" is a shell function");
7903 if (describe_command_verbose) {
7904 out1fmt(" is a %sshell builtin",
7905 IS_BUILTIN_SPECIAL(entry.u.cmd) ?
7906 "special " : nullstr
7914 if (describe_command_verbose) {
7915 out1str(": not found\n");
7924 static int FAST_FUNC
7925 typecmd(int argc UNUSED_PARAM, char **argv)
7931 /* type -p ... ? (we don't bother checking for 'p') */
7932 if (argv[1] && argv[1][0] == '-') {
7937 err |= describe_command(argv[i++], verbose);
7942 #if ENABLE_ASH_CMDCMD
7943 static int FAST_FUNC
7944 commandcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
7952 while ((c = nextopt("pvV")) != '\0')
7954 verify |= VERIFY_VERBOSE;
7956 verify |= VERIFY_BRIEF;
7961 /* Mimic bash: just "command -v" doesn't complain, it's a nop */
7962 if (verify && (*argptr != NULL)) {
7963 return describe_command(*argptr, verify - VERIFY_BRIEF);
7971 /* ============ eval.c */
7973 static int funcblocksize; /* size of structures in function */
7974 static int funcstringsize; /* size of strings in node */
7975 static void *funcblock; /* block to allocate function from */
7976 static char *funcstring; /* block to allocate strings from */
7978 /* flags in argument to evaltree */
7979 #define EV_EXIT 01 /* exit after evaluating tree */
7980 #define EV_TESTED 02 /* exit status is checked; ignore -e flag */
7981 #define EV_BACKCMD 04 /* command executing within back quotes */
7983 static const uint8_t nodesize[N_NUMBER] = {
7984 [NCMD ] = SHELL_ALIGN(sizeof(struct ncmd)),
7985 [NPIPE ] = SHELL_ALIGN(sizeof(struct npipe)),
7986 [NREDIR ] = SHELL_ALIGN(sizeof(struct nredir)),
7987 [NBACKGND ] = SHELL_ALIGN(sizeof(struct nredir)),
7988 [NSUBSHELL] = SHELL_ALIGN(sizeof(struct nredir)),
7989 [NAND ] = SHELL_ALIGN(sizeof(struct nbinary)),
7990 [NOR ] = SHELL_ALIGN(sizeof(struct nbinary)),
7991 [NSEMI ] = SHELL_ALIGN(sizeof(struct nbinary)),
7992 [NIF ] = SHELL_ALIGN(sizeof(struct nif)),
7993 [NWHILE ] = SHELL_ALIGN(sizeof(struct nbinary)),
7994 [NUNTIL ] = SHELL_ALIGN(sizeof(struct nbinary)),
7995 [NFOR ] = SHELL_ALIGN(sizeof(struct nfor)),
7996 [NCASE ] = SHELL_ALIGN(sizeof(struct ncase)),
7997 [NCLIST ] = SHELL_ALIGN(sizeof(struct nclist)),
7998 [NDEFUN ] = SHELL_ALIGN(sizeof(struct narg)),
7999 [NARG ] = SHELL_ALIGN(sizeof(struct narg)),
8000 [NTO ] = SHELL_ALIGN(sizeof(struct nfile)),
8001 #if ENABLE_ASH_BASH_COMPAT
8002 [NTO2 ] = SHELL_ALIGN(sizeof(struct nfile)),
8004 [NCLOBBER ] = SHELL_ALIGN(sizeof(struct nfile)),
8005 [NFROM ] = SHELL_ALIGN(sizeof(struct nfile)),
8006 [NFROMTO ] = SHELL_ALIGN(sizeof(struct nfile)),
8007 [NAPPEND ] = SHELL_ALIGN(sizeof(struct nfile)),
8008 [NTOFD ] = SHELL_ALIGN(sizeof(struct ndup)),
8009 [NFROMFD ] = SHELL_ALIGN(sizeof(struct ndup)),
8010 [NHERE ] = SHELL_ALIGN(sizeof(struct nhere)),
8011 [NXHERE ] = SHELL_ALIGN(sizeof(struct nhere)),
8012 [NNOT ] = SHELL_ALIGN(sizeof(struct nnot)),
8015 static void calcsize(union node *n);
8018 sizenodelist(struct nodelist *lp)
8021 funcblocksize += SHELL_ALIGN(sizeof(struct nodelist));
8028 calcsize(union node *n)
8032 funcblocksize += nodesize[n->type];
8035 calcsize(n->ncmd.redirect);
8036 calcsize(n->ncmd.args);
8037 calcsize(n->ncmd.assign);
8040 sizenodelist(n->npipe.cmdlist);
8045 calcsize(n->nredir.redirect);
8046 calcsize(n->nredir.n);
8053 calcsize(n->nbinary.ch2);
8054 calcsize(n->nbinary.ch1);
8057 calcsize(n->nif.elsepart);
8058 calcsize(n->nif.ifpart);
8059 calcsize(n->nif.test);
8062 funcstringsize += strlen(n->nfor.var) + 1;
8063 calcsize(n->nfor.body);
8064 calcsize(n->nfor.args);
8067 calcsize(n->ncase.cases);
8068 calcsize(n->ncase.expr);
8071 calcsize(n->nclist.body);
8072 calcsize(n->nclist.pattern);
8073 calcsize(n->nclist.next);
8077 sizenodelist(n->narg.backquote);
8078 funcstringsize += strlen(n->narg.text) + 1;
8079 calcsize(n->narg.next);
8082 #if ENABLE_ASH_BASH_COMPAT
8089 calcsize(n->nfile.fname);
8090 calcsize(n->nfile.next);
8094 calcsize(n->ndup.vname);
8095 calcsize(n->ndup.next);
8099 calcsize(n->nhere.doc);
8100 calcsize(n->nhere.next);
8103 calcsize(n->nnot.com);
8109 nodeckstrdup(char *s)
8111 char *rtn = funcstring;
8113 strcpy(funcstring, s);
8114 funcstring += strlen(s) + 1;
8118 static union node *copynode(union node *);
8120 static struct nodelist *
8121 copynodelist(struct nodelist *lp)
8123 struct nodelist *start;
8124 struct nodelist **lpp;
8129 funcblock = (char *) funcblock + SHELL_ALIGN(sizeof(struct nodelist));
8130 (*lpp)->n = copynode(lp->n);
8132 lpp = &(*lpp)->next;
8139 copynode(union node *n)
8146 funcblock = (char *) funcblock + nodesize[n->type];
8150 new->ncmd.redirect = copynode(n->ncmd.redirect);
8151 new->ncmd.args = copynode(n->ncmd.args);
8152 new->ncmd.assign = copynode(n->ncmd.assign);
8155 new->npipe.cmdlist = copynodelist(n->npipe.cmdlist);
8156 new->npipe.pipe_backgnd = n->npipe.pipe_backgnd;
8161 new->nredir.redirect = copynode(n->nredir.redirect);
8162 new->nredir.n = copynode(n->nredir.n);
8169 new->nbinary.ch2 = copynode(n->nbinary.ch2);
8170 new->nbinary.ch1 = copynode(n->nbinary.ch1);
8173 new->nif.elsepart = copynode(n->nif.elsepart);
8174 new->nif.ifpart = copynode(n->nif.ifpart);
8175 new->nif.test = copynode(n->nif.test);
8178 new->nfor.var = nodeckstrdup(n->nfor.var);
8179 new->nfor.body = copynode(n->nfor.body);
8180 new->nfor.args = copynode(n->nfor.args);
8183 new->ncase.cases = copynode(n->ncase.cases);
8184 new->ncase.expr = copynode(n->ncase.expr);
8187 new->nclist.body = copynode(n->nclist.body);
8188 new->nclist.pattern = copynode(n->nclist.pattern);
8189 new->nclist.next = copynode(n->nclist.next);
8193 new->narg.backquote = copynodelist(n->narg.backquote);
8194 new->narg.text = nodeckstrdup(n->narg.text);
8195 new->narg.next = copynode(n->narg.next);
8198 #if ENABLE_ASH_BASH_COMPAT
8205 new->nfile.fname = copynode(n->nfile.fname);
8206 new->nfile.fd = n->nfile.fd;
8207 new->nfile.next = copynode(n->nfile.next);
8211 new->ndup.vname = copynode(n->ndup.vname);
8212 new->ndup.dupfd = n->ndup.dupfd;
8213 new->ndup.fd = n->ndup.fd;
8214 new->ndup.next = copynode(n->ndup.next);
8218 new->nhere.doc = copynode(n->nhere.doc);
8219 new->nhere.fd = n->nhere.fd;
8220 new->nhere.next = copynode(n->nhere.next);
8223 new->nnot.com = copynode(n->nnot.com);
8226 new->type = n->type;
8231 * Make a copy of a parse tree.
8233 static struct funcnode *
8234 copyfunc(union node *n)
8239 funcblocksize = offsetof(struct funcnode, n);
8242 blocksize = funcblocksize;
8243 f = ckmalloc(blocksize + funcstringsize);
8244 funcblock = (char *) f + offsetof(struct funcnode, n);
8245 funcstring = (char *) f + blocksize;
8252 * Define a shell function.
8255 defun(char *name, union node *func)
8257 struct cmdentry entry;
8260 entry.cmdtype = CMDFUNCTION;
8261 entry.u.func = copyfunc(func);
8262 addcmdentry(name, &entry);
8266 /* Reasons for skipping commands (see comment on breakcmd routine) */
8267 #define SKIPBREAK (1 << 0)
8268 #define SKIPCONT (1 << 1)
8269 #define SKIPFUNC (1 << 2)
8270 #define SKIPFILE (1 << 3)
8271 #define SKIPEVAL (1 << 4)
8272 static smallint evalskip; /* set to SKIPxxx if we are skipping commands */
8273 static int skipcount; /* number of levels to skip */
8274 static int funcnest; /* depth of function calls */
8275 static int loopnest; /* current loop nesting level */
8277 /* Forward decl way out to parsing code - dotrap needs it */
8278 static int evalstring(char *s, int mask);
8280 /* Called to execute a trap.
8281 * Single callsite - at the end of evaltree().
8282 * If we return non-zero, evaltree raises EXEXIT exception.
8284 * Perhaps we should avoid entering new trap handlers
8285 * while we are executing a trap handler. [is it a TODO?]
8294 savestatus = exitstatus;
8298 TRACE(("dotrap entered\n"));
8299 for (sig = 1, g = gotsig; sig < NSIG; sig++, g++) {
8306 /* non-trapped SIGINT is handled separately by raise_interrupt,
8307 * don't upset it by resetting gotsig[SIGINT-1] */
8308 if (sig == SIGINT && !t)
8311 TRACE(("sig %d is active, will run handler '%s'\n", sig, t));
8315 want_exexit = evalstring(t, SKIPEVAL);
8316 exitstatus = savestatus;
8318 TRACE(("dotrap returns %d\n", want_exexit));
8323 TRACE(("dotrap returns 0\n"));
8327 /* forward declarations - evaluation is fairly recursive business... */
8328 static void evalloop(union node *, int);
8329 static void evalfor(union node *, int);
8330 static void evalcase(union node *, int);
8331 static void evalsubshell(union node *, int);
8332 static void expredir(union node *);
8333 static void evalpipe(union node *, int);
8334 static void evalcommand(union node *, int);
8335 static int evalbltin(const struct builtincmd *, int, char **);
8336 static void prehash(union node *);
8339 * Evaluate a parse tree. The value is left in the global variable
8343 evaltree(union node *n, int flags)
8345 struct jmploc *volatile savehandler = exception_handler;
8346 struct jmploc jmploc;
8348 void (*evalfn)(union node *, int);
8352 SAVE_INT(int_level);
8355 TRACE(("evaltree(NULL) called\n"));
8358 TRACE(("evaltree(%p: %d, %d) called\n", n, n->type, flags));
8360 exception_handler = &jmploc;
8362 int err = setjmp(jmploc.loc);
8364 /* if it was a signal, check for trap handlers */
8365 if (exception_type == EXSIG) {
8366 TRACE(("exception %d (EXSIG) in evaltree, err=%d\n",
8367 exception_type, err));
8370 /* continue on the way out */
8371 TRACE(("exception %d in evaltree, propagating err=%d\n",
8372 exception_type, err));
8373 exception_handler = savehandler;
8374 longjmp(exception_handler->loc, err);
8381 out1fmt("Node type = %d\n", n->type);
8386 evaltree(n->nnot.com, EV_TESTED);
8387 status = !exitstatus;
8390 expredir(n->nredir.redirect);
8391 status = redirectsafe(n->nredir.redirect, REDIR_PUSH);
8393 evaltree(n->nredir.n, flags & EV_TESTED);
8394 status = exitstatus;
8396 popredir(/*drop:*/ 0, /*restore:*/ 0 /* not sure */);
8399 evalfn = evalcommand;
8401 if (eflag && !(flags & EV_TESTED))
8413 evalfn = evalsubshell;
8426 #error NAND + 1 != NOR
8428 #if NOR + 1 != NSEMI
8429 #error NOR + 1 != NSEMI
8431 unsigned is_or = n->type - NAND;
8434 (flags | ((is_or >> 1) - 1)) & EV_TESTED
8436 if (!exitstatus == is_or)
8449 evaltree(n->nif.test, EV_TESTED);
8452 if (exitstatus == 0) {
8456 if (n->nif.elsepart) {
8457 n = n->nif.elsepart;
8462 defun(n->narg.text, n->narg.next);
8466 exitstatus = status;
8471 exception_handler = savehandler;
8474 /* Order of checks below is important:
8475 * signal handlers trigger before exit caused by "set -e".
8477 if (pending_sig && dotrap())
8479 if (checkexit & exitstatus)
8480 evalskip |= SKIPEVAL;
8482 if (flags & EV_EXIT) {
8484 raise_exception(EXEXIT);
8487 RESTORE_INT(int_level);
8488 TRACE(("leaving evaltree (no interrupts)\n"));
8491 #if !defined(__alpha__) || (defined(__GNUC__) && __GNUC__ >= 3)
8494 void evaltreenr(union node *, int) __attribute__ ((alias("evaltree"),__noreturn__));
8497 evalloop(union node *n, int flags)
8507 evaltree(n->nbinary.ch1, EV_TESTED);
8510 if (evalskip == SKIPCONT && --skipcount <= 0) {
8514 if (evalskip == SKIPBREAK && --skipcount <= 0)
8519 if (n->type != NWHILE)
8523 evaltree(n->nbinary.ch2, flags);
8524 status = exitstatus;
8529 exitstatus = status;
8533 evalfor(union node *n, int flags)
8535 struct arglist arglist;
8538 struct stackmark smark;
8540 setstackmark(&smark);
8541 arglist.list = NULL;
8542 arglist.lastp = &arglist.list;
8543 for (argp = n->nfor.args; argp; argp = argp->narg.next) {
8544 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE | EXP_RECORD);
8549 *arglist.lastp = NULL;
8554 for (sp = arglist.list; sp; sp = sp->next) {
8555 setvar(n->nfor.var, sp->text, 0);
8556 evaltree(n->nfor.body, flags);
8558 if (evalskip == SKIPCONT && --skipcount <= 0) {
8562 if (evalskip == SKIPBREAK && --skipcount <= 0)
8569 popstackmark(&smark);
8573 evalcase(union node *n, int flags)
8577 struct arglist arglist;
8578 struct stackmark smark;
8580 setstackmark(&smark);
8581 arglist.list = NULL;
8582 arglist.lastp = &arglist.list;
8583 expandarg(n->ncase.expr, &arglist, EXP_TILDE);
8585 for (cp = n->ncase.cases; cp && evalskip == 0; cp = cp->nclist.next) {
8586 for (patp = cp->nclist.pattern; patp; patp = patp->narg.next) {
8587 if (casematch(patp, arglist.list->text)) {
8588 if (evalskip == 0) {
8589 evaltree(cp->nclist.body, flags);
8596 popstackmark(&smark);
8600 * Kick off a subshell to evaluate a tree.
8603 evalsubshell(union node *n, int flags)
8606 int backgnd = (n->type == NBACKGND);
8609 expredir(n->nredir.redirect);
8610 if (!backgnd && (flags & EV_EXIT) && !may_have_traps)
8613 jp = makejob(/*n,*/ 1);
8614 if (forkshell(jp, n, backgnd) == 0) {
8619 flags &= ~EV_TESTED;
8621 redirect(n->nredir.redirect, 0);
8622 evaltreenr(n->nredir.n, flags);
8627 status = waitforjob(jp);
8628 exitstatus = status;
8633 * Compute the names of the files in a redirection list.
8635 static void fixredir(union node *, const char *, int);
8637 expredir(union node *n)
8641 for (redir = n; redir; redir = redir->nfile.next) {
8645 fn.lastp = &fn.list;
8646 switch (redir->type) {
8650 #if ENABLE_ASH_BASH_COMPAT
8655 expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR);
8656 #if ENABLE_ASH_BASH_COMPAT
8659 redir->nfile.expfname = fn.list->text;
8662 case NTOFD: /* >& */
8663 if (redir->ndup.vname) {
8664 expandarg(redir->ndup.vname, &fn, EXP_FULL | EXP_TILDE);
8665 if (fn.list == NULL)
8666 ash_msg_and_raise_error("redir error");
8667 #if ENABLE_ASH_BASH_COMPAT
8668 //FIXME: we used expandarg with different args!
8669 if (!isdigit_str9(fn.list->text)) {
8670 /* >&file, not >&fd */
8671 if (redir->nfile.fd != 1) /* 123>&file - BAD */
8672 ash_msg_and_raise_error("redir error");
8674 goto store_expfname;
8677 fixredir(redir, fn.list->text, 1);
8685 * Evaluate a pipeline. All the processes in the pipeline are children
8686 * of the process creating the pipeline. (This differs from some versions
8687 * of the shell, which make the last process in a pipeline the parent
8691 evalpipe(union node *n, int flags)
8694 struct nodelist *lp;
8699 TRACE(("evalpipe(0x%lx) called\n", (long)n));
8701 for (lp = n->npipe.cmdlist; lp; lp = lp->next)
8705 jp = makejob(/*n,*/ pipelen);
8707 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
8711 if (pipe(pip) < 0) {
8713 ash_msg_and_raise_error("pipe call failed");
8716 if (forkshell(jp, lp->n, n->npipe.pipe_backgnd) == 0) {
8729 evaltreenr(lp->n, flags);
8735 /* Don't want to trigger debugging */
8739 if (n->npipe.pipe_backgnd == 0) {
8740 exitstatus = waitforjob(jp);
8741 TRACE(("evalpipe: job done exit status %d\n", exitstatus));
8747 * Controls whether the shell is interactive or not.
8750 setinteractive(int on)
8752 static smallint is_interactive;
8754 if (++on == is_interactive)
8756 is_interactive = on;
8760 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
8761 if (is_interactive > 1) {
8762 /* Looks like they want an interactive shell */
8763 static smallint did_banner;
8766 /* note: ash and hush share this string */
8767 out1fmt("\n\n%s %s\n"
8768 "Enter 'help' for a list of built-in commands."
8771 "built-in shell (ash)"
8785 setinteractive(iflag);
8787 #if ENABLE_FEATURE_EDITING_VI
8789 line_input_state->flags |= VI_MODE;
8791 line_input_state->flags &= ~VI_MODE;
8793 viflag = 0; /* forcibly keep the option off */
8797 static struct localvar *localvars;
8800 * Called after a function returns.
8801 * Interrupts must be off.
8806 struct localvar *lvp;
8809 while ((lvp = localvars) != NULL) {
8810 localvars = lvp->next;
8812 TRACE(("poplocalvar %s\n", vp ? vp->var_text : "-"));
8813 if (vp == NULL) { /* $- saved */
8814 memcpy(optlist, lvp->text, sizeof(optlist));
8815 free((char*)lvp->text);
8817 } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) {
8818 unsetvar(vp->var_text);
8821 vp->var_func(var_end(lvp->text));
8822 if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
8823 free((char*)vp->var_text);
8824 vp->flags = lvp->flags;
8825 vp->var_text = lvp->text;
8832 evalfun(struct funcnode *func, int argc, char **argv, int flags)
8834 volatile struct shparam saveparam;
8835 struct localvar *volatile savelocalvars;
8836 struct jmploc *volatile savehandler;
8837 struct jmploc jmploc;
8840 saveparam = shellparam;
8841 savelocalvars = localvars;
8842 e = setjmp(jmploc.loc);
8847 savehandler = exception_handler;
8848 exception_handler = &jmploc;
8850 shellparam.malloced = 0;
8854 shellparam.nparam = argc - 1;
8855 shellparam.p = argv + 1;
8856 #if ENABLE_ASH_GETOPTS
8857 shellparam.optind = 1;
8858 shellparam.optoff = -1;
8860 evaltree(&func->n, flags & EV_TESTED);
8866 localvars = savelocalvars;
8867 freeparam(&shellparam);
8868 shellparam = saveparam;
8869 exception_handler = savehandler;
8871 evalskip &= ~SKIPFUNC;
8875 #if ENABLE_ASH_CMDCMD
8877 parse_command_args(char **argv, const char **path)
8890 if (c == '-' && !*cp) {
8897 *path = bb_default_path;
8900 /* run 'typecmd' for other options */
8911 * Make a variable a local variable. When a variable is made local, it's
8912 * value and flags are saved in a localvar structure. The saved values
8913 * will be restored when the shell function returns. We handle the name
8914 * "-" as a special case.
8919 struct localvar *lvp;
8924 lvp = ckzalloc(sizeof(struct localvar));
8925 if (LONE_DASH(name)) {
8927 p = ckmalloc(sizeof(optlist));
8928 lvp->text = memcpy(p, optlist, sizeof(optlist));
8933 vpp = hashvar(name);
8934 vp = *findvar(vpp, name);
8935 eq = strchr(name, '=');
8938 setvareq(name, VSTRFIXED);
8940 setvar(name, NULL, VSTRFIXED);
8941 vp = *vpp; /* the new variable */
8942 lvp->flags = VUNSET;
8944 lvp->text = vp->var_text;
8945 lvp->flags = vp->flags;
8946 vp->flags |= VSTRFIXED|VTEXTFIXED;
8952 lvp->next = localvars;
8958 * The "local" command.
8960 static int FAST_FUNC
8961 localcmd(int argc UNUSED_PARAM, char **argv)
8966 while ((name = *argv++) != NULL) {
8972 static int FAST_FUNC
8973 falsecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
8978 static int FAST_FUNC
8979 truecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
8984 static int FAST_FUNC
8985 execcmd(int argc UNUSED_PARAM, char **argv)
8988 iflag = 0; /* exit on error */
8991 shellexec(argv + 1, pathval(), 0);
8997 * The return command.
8999 static int FAST_FUNC
9000 returncmd(int argc UNUSED_PARAM, char **argv)
9003 * If called outside a function, do what ksh does;
9004 * skip the rest of the file.
9006 evalskip = funcnest ? SKIPFUNC : SKIPFILE;
9007 return argv[1] ? number(argv[1]) : exitstatus;
9010 /* Forward declarations for builtintab[] */
9011 static int breakcmd(int, char **) FAST_FUNC;
9012 static int dotcmd(int, char **) FAST_FUNC;
9013 static int evalcmd(int, char **) FAST_FUNC;
9014 static int exitcmd(int, char **) FAST_FUNC;
9015 static int exportcmd(int, char **) FAST_FUNC;
9016 #if ENABLE_ASH_GETOPTS
9017 static int getoptscmd(int, char **) FAST_FUNC;
9019 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
9020 static int helpcmd(int, char **) FAST_FUNC;
9022 #if ENABLE_SH_MATH_SUPPORT
9023 static int letcmd(int, char **) FAST_FUNC;
9025 static int readcmd(int, char **) FAST_FUNC;
9026 static int setcmd(int, char **) FAST_FUNC;
9027 static int shiftcmd(int, char **) FAST_FUNC;
9028 static int timescmd(int, char **) FAST_FUNC;
9029 static int trapcmd(int, char **) FAST_FUNC;
9030 static int umaskcmd(int, char **) FAST_FUNC;
9031 static int unsetcmd(int, char **) FAST_FUNC;
9032 static int ulimitcmd(int, char **) FAST_FUNC;
9034 #define BUILTIN_NOSPEC "0"
9035 #define BUILTIN_SPECIAL "1"
9036 #define BUILTIN_REGULAR "2"
9037 #define BUILTIN_SPEC_REG "3"
9038 #define BUILTIN_ASSIGN "4"
9039 #define BUILTIN_SPEC_ASSG "5"
9040 #define BUILTIN_REG_ASSG "6"
9041 #define BUILTIN_SPEC_REG_ASSG "7"
9043 /* Stubs for calling non-FAST_FUNC's */
9044 #if ENABLE_ASH_BUILTIN_ECHO
9045 static int FAST_FUNC echocmd(int argc, char **argv) { return echo_main(argc, argv); }
9047 #if ENABLE_ASH_BUILTIN_PRINTF
9048 static int FAST_FUNC printfcmd(int argc, char **argv) { return printf_main(argc, argv); }
9050 #if ENABLE_ASH_BUILTIN_TEST
9051 static int FAST_FUNC testcmd(int argc, char **argv) { return test_main(argc, argv); }
9054 /* Keep these in proper order since it is searched via bsearch() */
9055 static const struct builtincmd builtintab[] = {
9056 { BUILTIN_SPEC_REG "." , dotcmd },
9057 { BUILTIN_SPEC_REG ":" , truecmd },
9058 #if ENABLE_ASH_BUILTIN_TEST
9059 { BUILTIN_REGULAR "[" , testcmd },
9060 #if ENABLE_ASH_BASH_COMPAT
9061 { BUILTIN_REGULAR "[[" , testcmd },
9064 #if ENABLE_ASH_ALIAS
9065 { BUILTIN_REG_ASSG "alias" , aliascmd },
9068 { BUILTIN_REGULAR "bg" , fg_bgcmd },
9070 { BUILTIN_SPEC_REG "break" , breakcmd },
9071 { BUILTIN_REGULAR "cd" , cdcmd },
9072 { BUILTIN_NOSPEC "chdir" , cdcmd },
9073 #if ENABLE_ASH_CMDCMD
9074 { BUILTIN_REGULAR "command" , commandcmd },
9076 { BUILTIN_SPEC_REG "continue", breakcmd },
9077 #if ENABLE_ASH_BUILTIN_ECHO
9078 { BUILTIN_REGULAR "echo" , echocmd },
9080 { BUILTIN_SPEC_REG "eval" , evalcmd },
9081 { BUILTIN_SPEC_REG "exec" , execcmd },
9082 { BUILTIN_SPEC_REG "exit" , exitcmd },
9083 { BUILTIN_SPEC_REG_ASSG "export" , exportcmd },
9084 { BUILTIN_REGULAR "false" , falsecmd },
9086 { BUILTIN_REGULAR "fg" , fg_bgcmd },
9088 #if ENABLE_ASH_GETOPTS
9089 { BUILTIN_REGULAR "getopts" , getoptscmd },
9091 { BUILTIN_NOSPEC "hash" , hashcmd },
9092 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
9093 { BUILTIN_NOSPEC "help" , helpcmd },
9096 { BUILTIN_REGULAR "jobs" , jobscmd },
9097 { BUILTIN_REGULAR "kill" , killcmd },
9099 #if ENABLE_SH_MATH_SUPPORT
9100 { BUILTIN_NOSPEC "let" , letcmd },
9102 { BUILTIN_ASSIGN "local" , localcmd },
9103 #if ENABLE_ASH_BUILTIN_PRINTF
9104 { BUILTIN_REGULAR "printf" , printfcmd },
9106 { BUILTIN_NOSPEC "pwd" , pwdcmd },
9107 { BUILTIN_REGULAR "read" , readcmd },
9108 { BUILTIN_SPEC_REG_ASSG "readonly", exportcmd },
9109 { BUILTIN_SPEC_REG "return" , returncmd },
9110 { BUILTIN_SPEC_REG "set" , setcmd },
9111 { BUILTIN_SPEC_REG "shift" , shiftcmd },
9112 #if ENABLE_ASH_BASH_COMPAT
9113 { BUILTIN_SPEC_REG "source" , dotcmd },
9115 #if ENABLE_ASH_BUILTIN_TEST
9116 { BUILTIN_REGULAR "test" , testcmd },
9118 { BUILTIN_SPEC_REG "times" , timescmd },
9119 { BUILTIN_SPEC_REG "trap" , trapcmd },
9120 { BUILTIN_REGULAR "true" , truecmd },
9121 { BUILTIN_NOSPEC "type" , typecmd },
9122 { BUILTIN_NOSPEC "ulimit" , ulimitcmd },
9123 { BUILTIN_REGULAR "umask" , umaskcmd },
9124 #if ENABLE_ASH_ALIAS
9125 { BUILTIN_REGULAR "unalias" , unaliascmd },
9127 { BUILTIN_SPEC_REG "unset" , unsetcmd },
9128 { BUILTIN_REGULAR "wait" , waitcmd },
9131 /* Should match the above table! */
9132 #define COMMANDCMD (builtintab + \
9134 1 * ENABLE_ASH_BUILTIN_TEST + \
9135 1 * ENABLE_ASH_BUILTIN_TEST * ENABLE_ASH_BASH_COMPAT + \
9136 1 * ENABLE_ASH_ALIAS + \
9137 1 * ENABLE_ASH_JOB_CONTROL + \
9139 #define EXECCMD (builtintab + \
9141 1 * ENABLE_ASH_BUILTIN_TEST + \
9142 1 * ENABLE_ASH_BUILTIN_TEST * ENABLE_ASH_BASH_COMPAT + \
9143 1 * ENABLE_ASH_ALIAS + \
9144 1 * ENABLE_ASH_JOB_CONTROL + \
9146 1 * ENABLE_ASH_CMDCMD + \
9148 ENABLE_ASH_BUILTIN_ECHO + \
9152 * Search the table of builtin commands.
9154 static struct builtincmd *
9155 find_builtin(const char *name)
9157 struct builtincmd *bp;
9160 name, builtintab, ARRAY_SIZE(builtintab), sizeof(builtintab[0]),
9167 * Execute a simple command.
9170 isassignment(const char *p)
9172 const char *q = endofname(p);
9177 static int FAST_FUNC
9178 bltincmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
9180 /* Preserve exitstatus of a previous possible redirection
9181 * as POSIX mandates */
9182 return back_exitstatus;
9185 evalcommand(union node *cmd, int flags)
9187 static const struct builtincmd null_bltin = {
9188 "\0\0", bltincmd /* why three NULs? */
9190 struct stackmark smark;
9192 struct arglist arglist;
9193 struct arglist varlist;
9196 const struct strlist *sp;
9197 struct cmdentry cmdentry;
9204 struct builtincmd *bcmd;
9205 smallint cmd_is_exec;
9206 smallint pseudovarflag = 0;
9208 /* First expand the arguments. */
9209 TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags));
9210 setstackmark(&smark);
9211 back_exitstatus = 0;
9213 cmdentry.cmdtype = CMDBUILTIN;
9214 cmdentry.u.cmd = &null_bltin;
9215 varlist.lastp = &varlist.list;
9216 *varlist.lastp = NULL;
9217 arglist.lastp = &arglist.list;
9218 *arglist.lastp = NULL;
9221 if (cmd->ncmd.args) {
9222 bcmd = find_builtin(cmd->ncmd.args->narg.text);
9223 pseudovarflag = bcmd && IS_BUILTIN_ASSIGN(bcmd);
9226 for (argp = cmd->ncmd.args; argp; argp = argp->narg.next) {
9227 struct strlist **spp;
9229 spp = arglist.lastp;
9230 if (pseudovarflag && isassignment(argp->narg.text))
9231 expandarg(argp, &arglist, EXP_VARTILDE);
9233 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
9235 for (sp = *spp; sp; sp = sp->next)
9239 argv = nargv = stalloc(sizeof(char *) * (argc + 1));
9240 for (sp = arglist.list; sp; sp = sp->next) {
9241 TRACE(("evalcommand arg: %s\n", sp->text));
9242 *nargv++ = sp->text;
9247 if (iflag && funcnest == 0 && argc > 0)
9248 lastarg = nargv[-1];
9251 expredir(cmd->ncmd.redirect);
9252 status = redirectsafe(cmd->ncmd.redirect, REDIR_PUSH | REDIR_SAVEFD2);
9254 path = vpath.var_text;
9255 for (argp = cmd->ncmd.assign; argp; argp = argp->narg.next) {
9256 struct strlist **spp;
9259 spp = varlist.lastp;
9260 expandarg(argp, &varlist, EXP_VARTILDE);
9263 * Modify the command lookup path, if a PATH= assignment
9267 if (varcmp(p, path) == 0)
9271 /* Print the command if xflag is set. */
9274 const char *p = " %s" + 1;
9276 fdprintf(preverrout_fd, p, expandstr(ps4val()));
9278 for (n = 0; n < 2; n++) {
9280 fdprintf(preverrout_fd, p, sp->text);
9286 safe_write(preverrout_fd, "\n", 1);
9292 /* Now locate the command. */
9294 const char *oldpath;
9295 int cmd_flag = DO_ERR;
9300 find_command(argv[0], &cmdentry, cmd_flag, path);
9301 if (cmdentry.cmdtype == CMDUNKNOWN) {
9302 flush_stdout_stderr();
9307 /* implement bltin and command here */
9308 if (cmdentry.cmdtype != CMDBUILTIN)
9311 spclbltin = IS_BUILTIN_SPECIAL(cmdentry.u.cmd);
9312 if (cmdentry.u.cmd == EXECCMD)
9314 #if ENABLE_ASH_CMDCMD
9315 if (cmdentry.u.cmd == COMMANDCMD) {
9317 nargv = parse_command_args(argv, &path);
9320 argc -= nargv - argv;
9322 cmd_flag |= DO_NOFUNC;
9330 /* We have a redirection error. */
9332 raise_exception(EXERROR);
9334 exitstatus = status;
9338 /* Execute the command. */
9339 switch (cmdentry.cmdtype) {
9342 #if ENABLE_FEATURE_SH_NOFORK
9343 /* (1) BUG: if variables are set, we need to fork, or save/restore them
9344 * around run_nofork_applet() call.
9345 * (2) Should this check also be done in forkshell()?
9346 * (perhaps it should, so that "VAR=VAL nofork" at least avoids exec...)
9348 /* find_command() encodes applet_no as (-2 - applet_no) */
9349 int applet_no = (- cmdentry.u.index - 2);
9350 if (applet_no >= 0 && APPLET_IS_NOFORK(applet_no)) {
9351 listsetvar(varlist.list, VEXPORT|VSTACK);
9352 /* run <applet>_main() */
9353 exitstatus = run_nofork_applet(applet_no, argv);
9357 /* Can we avoid forking off? For example, very last command
9358 * in a script or a subshell does not need forking,
9359 * we can just exec it.
9361 if (!(flags & EV_EXIT) || may_have_traps) {
9362 /* No, forking off a child is necessary */
9364 jp = makejob(/*cmd,*/ 1);
9365 if (forkshell(jp, cmd, FORK_FG) != 0) {
9367 exitstatus = waitforjob(jp);
9369 TRACE(("forked child exited with %d\n", exitstatus));
9374 /* fall through to exec'ing external program */
9376 listsetvar(varlist.list, VEXPORT|VSTACK);
9377 shellexec(argv, path, cmdentry.u.index);
9381 cmdenviron = varlist.list;
9383 struct strlist *list = cmdenviron;
9385 if (spclbltin > 0 || argc == 0) {
9387 if (cmd_is_exec && argc > 1)
9390 listsetvar(list, i);
9392 /* Tight loop with builtins only:
9393 * "while kill -0 $child; do true; done"
9394 * will never exit even if $child died, unless we do this
9395 * to reap the zombie and make kill detect that it's gone: */
9396 dowait(DOWAIT_NONBLOCK, NULL);
9398 if (evalbltin(cmdentry.u.cmd, argc, argv)) {
9400 int i = exception_type;
9405 exit_status = 128 + SIGINT;
9407 exit_status = 128 + pending_sig;
9408 exitstatus = exit_status;
9409 if (i == EXINT || spclbltin > 0) {
9411 longjmp(exception_handler->loc, 1);
9418 listsetvar(varlist.list, 0);
9419 /* See above for the rationale */
9420 dowait(DOWAIT_NONBLOCK, NULL);
9421 if (evalfun(cmdentry.u.func, argc, argv, flags))
9428 popredir(/*drop:*/ cmd_is_exec, /*restore:*/ cmd_is_exec);
9430 /* dsl: I think this is intended to be used to support
9431 * '_' in 'vi' command mode during line editing...
9432 * However I implemented that within libedit itself.
9434 setvar("_", lastarg, 0);
9436 popstackmark(&smark);
9440 evalbltin(const struct builtincmd *cmd, int argc, char **argv)
9442 char *volatile savecmdname;
9443 struct jmploc *volatile savehandler;
9444 struct jmploc jmploc;
9447 savecmdname = commandname;
9448 i = setjmp(jmploc.loc);
9451 savehandler = exception_handler;
9452 exception_handler = &jmploc;
9453 commandname = argv[0];
9455 optptr = NULL; /* initialize nextopt */
9456 exitstatus = (*cmd->builtin)(argc, argv);
9457 flush_stdout_stderr();
9459 exitstatus |= ferror(stdout);
9461 commandname = savecmdname;
9462 exception_handler = savehandler;
9468 goodname(const char *p)
9470 return endofname(p)[0] == '\0';
9475 * Search for a command. This is called before we fork so that the
9476 * location of the command will be available in the parent as well as
9477 * the child. The check for "goodname" is an overly conservative
9478 * check that the name will not be subject to expansion.
9481 prehash(union node *n)
9483 struct cmdentry entry;
9485 if (n->type == NCMD && n->ncmd.args && goodname(n->ncmd.args->narg.text))
9486 find_command(n->ncmd.args->narg.text, &entry, 0, pathval());
9490 /* ============ Builtin commands
9492 * Builtin commands whose functions are closely tied to evaluation
9493 * are implemented here.
9497 * Handle break and continue commands. Break, continue, and return are
9498 * all handled by setting the evalskip flag. The evaluation routines
9499 * above all check this flag, and if it is set they start skipping
9500 * commands rather than executing them. The variable skipcount is
9501 * the number of loops to break/continue, or the number of function
9502 * levels to return. (The latter is always 1.) It should probably
9503 * be an error to break out of more loops than exist, but it isn't
9504 * in the standard shell so we don't make it one here.
9506 static int FAST_FUNC
9507 breakcmd(int argc UNUSED_PARAM, char **argv)
9509 int n = argv[1] ? number(argv[1]) : 1;
9512 ash_msg_and_raise_error(msg_illnum, argv[1]);
9516 evalskip = (**argv == 'c') ? SKIPCONT : SKIPBREAK;
9523 /* ============ input.c
9525 * This implements the input routines used by the parser.
9529 INPUT_PUSH_FILE = 1,
9530 INPUT_NOFILE_OK = 2,
9533 static smallint checkkwd;
9534 /* values of checkkwd variable */
9535 #define CHKALIAS 0x1
9540 * Push a string back onto the input at this current parsefile level.
9541 * We handle aliases this way.
9543 #if !ENABLE_ASH_ALIAS
9544 #define pushstring(s, ap) pushstring(s)
9547 pushstring(char *s, struct alias *ap)
9554 if (g_parsefile->strpush) {
9555 sp = ckzalloc(sizeof(*sp));
9556 sp->prev = g_parsefile->strpush;
9558 sp = &(g_parsefile->basestrpush);
9560 g_parsefile->strpush = sp;
9561 sp->prev_string = g_parsefile->next_to_pgetc;
9562 sp->prev_left_in_line = g_parsefile->left_in_line;
9563 #if ENABLE_ASH_ALIAS
9566 ap->flag |= ALIASINUSE;
9570 g_parsefile->next_to_pgetc = s;
9571 g_parsefile->left_in_line = len;
9578 struct strpush *sp = g_parsefile->strpush;
9581 #if ENABLE_ASH_ALIAS
9583 if (g_parsefile->next_to_pgetc[-1] == ' '
9584 || g_parsefile->next_to_pgetc[-1] == '\t'
9586 checkkwd |= CHKALIAS;
9588 if (sp->string != sp->ap->val) {
9591 sp->ap->flag &= ~ALIASINUSE;
9592 if (sp->ap->flag & ALIASDEAD) {
9593 unalias(sp->ap->name);
9597 g_parsefile->next_to_pgetc = sp->prev_string;
9598 g_parsefile->left_in_line = sp->prev_left_in_line;
9599 g_parsefile->strpush = sp->prev;
9600 if (sp != &(g_parsefile->basestrpush))
9605 //FIXME: BASH_COMPAT with "...&" does TWO pungetc():
9606 //it peeks whether it is &>, and then pushes back both chars.
9607 //This function needs to save last *next_to_pgetc to buf[0]
9608 //to make two pungetc() reliable. Currently,
9609 // pgetc (out of buf: does preadfd), pgetc, pungetc, pungetc won't work...
9614 char *buf = g_parsefile->buf;
9616 g_parsefile->next_to_pgetc = buf;
9617 #if ENABLE_FEATURE_EDITING
9619 if (!iflag || g_parsefile->pf_fd != STDIN_FILENO)
9620 nr = nonblock_safe_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1);
9623 # if ENABLE_ASH_IDLE_TIMEOUT
9625 const char *tmout_var = lookupvar("TMOUT");
9627 timeout = atoi(tmout_var) * 1000;
9633 # if ENABLE_FEATURE_TAB_COMPLETION
9634 line_input_state->path_lookup = pathval();
9636 nr = read_line_input(line_input_state, cmdedit_prompt, buf, IBUFSIZ, timeout);
9638 /* Ctrl+C pressed */
9649 /* Ctrl+D pressed */
9652 # if ENABLE_ASH_IDLE_TIMEOUT
9653 else if (errno == EAGAIN && timeout > 0) {
9654 printf("\007timed out waiting for input: auto-logout\n");
9661 nr = nonblock_safe_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1);
9664 #if 0 /* disabled: nonblock_safe_read() handles this problem */
9666 if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
9667 int flags = fcntl(0, F_GETFL);
9668 if (flags >= 0 && (flags & O_NONBLOCK)) {
9669 flags &= ~O_NONBLOCK;
9670 if (fcntl(0, F_SETFL, flags) >= 0) {
9671 out2str("sh: turning off NDELAY mode\n");
9682 * Refill the input buffer and return the next input character:
9684 * 1) If a string was pushed back on the input, pop it;
9685 * 2) If an EOF was pushed back (g_parsefile->left_in_line < -BIGNUM)
9686 * or we are reading from a string so we can't refill the buffer,
9688 * 3) If there is more stuff in this buffer, use it else call read to fill it.
9689 * 4) Process input up to the next newline, deleting nul characters.
9691 //#define pgetc_debug(...) bb_error_msg(__VA_ARGS__)
9692 #define pgetc_debug(...) ((void)0)
9699 while (g_parsefile->strpush) {
9700 #if ENABLE_ASH_ALIAS
9701 if (g_parsefile->left_in_line == -1
9702 && g_parsefile->strpush->ap
9703 && g_parsefile->next_to_pgetc[-1] != ' '
9704 && g_parsefile->next_to_pgetc[-1] != '\t'
9706 pgetc_debug("preadbuffer PEOA");
9711 /* try "pgetc" now: */
9712 pgetc_debug("preadbuffer internal pgetc at %d:%p'%s'",
9713 g_parsefile->left_in_line,
9714 g_parsefile->next_to_pgetc,
9715 g_parsefile->next_to_pgetc);
9716 if (--g_parsefile->left_in_line >= 0)
9717 return (unsigned char)(*g_parsefile->next_to_pgetc++);
9719 /* on both branches above g_parsefile->left_in_line < 0.
9720 * "pgetc" needs refilling.
9723 /* -90 is our -BIGNUM. Below we use -99 to mark "EOF on read",
9724 * pungetc() may increment it a few times.
9725 * Assuming it won't increment it to less than -90.
9727 if (g_parsefile->left_in_line < -90 || g_parsefile->buf == NULL) {
9728 pgetc_debug("preadbuffer PEOF1");
9729 /* even in failure keep left_in_line and next_to_pgetc
9730 * in lock step, for correct multi-layer pungetc.
9731 * left_in_line was decremented before preadbuffer(),
9732 * must inc next_to_pgetc: */
9733 g_parsefile->next_to_pgetc++;
9737 more = g_parsefile->left_in_buffer;
9739 flush_stdout_stderr();
9743 /* don't try reading again */
9744 g_parsefile->left_in_line = -99;
9745 pgetc_debug("preadbuffer PEOF2");
9746 g_parsefile->next_to_pgetc++;
9751 /* Find out where's the end of line.
9752 * Set g_parsefile->left_in_line
9753 * and g_parsefile->left_in_buffer acordingly.
9754 * NUL chars are deleted.
9756 q = g_parsefile->next_to_pgetc;
9764 memmove(q, q + 1, more);
9768 g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1;
9774 g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1;
9775 if (g_parsefile->left_in_line < 0)
9780 g_parsefile->left_in_buffer = more;
9785 out2str(g_parsefile->next_to_pgetc);
9789 pgetc_debug("preadbuffer at %d:%p'%s'",
9790 g_parsefile->left_in_line,
9791 g_parsefile->next_to_pgetc,
9792 g_parsefile->next_to_pgetc);
9793 return (unsigned char)*g_parsefile->next_to_pgetc++;
9796 #define pgetc_as_macro() \
9797 (--g_parsefile->left_in_line >= 0 \
9798 ? (unsigned char)*g_parsefile->next_to_pgetc++ \
9805 pgetc_debug("pgetc_fast at %d:%p'%s'",
9806 g_parsefile->left_in_line,
9807 g_parsefile->next_to_pgetc,
9808 g_parsefile->next_to_pgetc);
9809 return pgetc_as_macro();
9812 #if ENABLE_ASH_OPTIMIZE_FOR_SIZE
9813 # define pgetc_fast() pgetc()
9815 # define pgetc_fast() pgetc_as_macro()
9818 #if ENABLE_ASH_ALIAS
9820 pgetc_without_PEOA(void)
9824 pgetc_debug("pgetc_fast at %d:%p'%s'",
9825 g_parsefile->left_in_line,
9826 g_parsefile->next_to_pgetc,
9827 g_parsefile->next_to_pgetc);
9829 } while (c == PEOA);
9833 # define pgetc_without_PEOA() pgetc()
9837 * Read a line from the script.
9840 pfgets(char *line, int len)
9846 while (--nleft > 0) {
9847 c = pgetc_without_PEOA();
9862 * Undo the last call to pgetc. Only one character may be pushed back.
9863 * PEOF may be pushed back.
9868 g_parsefile->left_in_line++;
9869 g_parsefile->next_to_pgetc--;
9870 pgetc_debug("pushed back to %d:%p'%s'",
9871 g_parsefile->left_in_line,
9872 g_parsefile->next_to_pgetc,
9873 g_parsefile->next_to_pgetc);
9877 * To handle the "." command, a stack of input files is used. Pushfile
9878 * adds a new entry to the stack and popfile restores the previous level.
9883 struct parsefile *pf;
9885 pf = ckzalloc(sizeof(*pf));
9886 pf->prev = g_parsefile;
9888 /*pf->strpush = NULL; - ckzalloc did it */
9889 /*pf->basestrpush.prev = NULL;*/
9896 struct parsefile *pf = g_parsefile;
9904 g_parsefile = pf->prev;
9910 * Return to top level.
9915 while (g_parsefile != &basepf)
9920 * Close the file(s) that the shell is reading commands from. Called
9921 * after a fork is done.
9927 if (g_parsefile->pf_fd > 0) {
9928 close(g_parsefile->pf_fd);
9929 g_parsefile->pf_fd = 0;
9934 * Like setinputfile, but takes an open file descriptor. Call this with
9938 setinputfd(int fd, int push)
9940 close_on_exec_on(fd);
9943 g_parsefile->buf = NULL;
9945 g_parsefile->pf_fd = fd;
9946 if (g_parsefile->buf == NULL)
9947 g_parsefile->buf = ckmalloc(IBUFSIZ);
9948 g_parsefile->left_in_buffer = 0;
9949 g_parsefile->left_in_line = 0;
9950 g_parsefile->linno = 1;
9954 * Set the input to take input from a file. If push is set, push the
9955 * old input onto the stack first.
9958 setinputfile(const char *fname, int flags)
9964 fd = open(fname, O_RDONLY);
9966 if (flags & INPUT_NOFILE_OK)
9968 ash_msg_and_raise_error("can't open '%s'", fname);
9971 fd2 = copyfd(fd, 10);
9974 ash_msg_and_raise_error("out of file descriptors");
9977 setinputfd(fd, flags & INPUT_PUSH_FILE);
9984 * Like setinputfile, but takes input from a string.
9987 setinputstring(char *string)
9991 g_parsefile->next_to_pgetc = string;
9992 g_parsefile->left_in_line = strlen(string);
9993 g_parsefile->buf = NULL;
9994 g_parsefile->linno = 1;
9999 /* ============ mail.c
10001 * Routines to check for mail.
10004 #if ENABLE_ASH_MAIL
10006 #define MAXMBOXES 10
10008 /* times of mailboxes */
10009 static time_t mailtime[MAXMBOXES];
10010 /* Set if MAIL or MAILPATH is changed. */
10011 static smallint mail_var_path_changed;
10014 * Print appropriate message(s) if mail has arrived.
10015 * If mail_var_path_changed is set,
10016 * then the value of MAIL has mail_var_path_changed,
10017 * so we just update the values.
10026 struct stackmark smark;
10029 setstackmark(&smark);
10030 mpath = mpathset() ? mpathval() : mailval();
10031 for (mtp = mailtime; mtp < mailtime + MAXMBOXES; mtp++) {
10032 p = path_advance(&mpath, nullstr);
10037 for (q = p; *q; q++)
10043 q[-1] = '\0'; /* delete trailing '/' */
10044 if (stat(p, &statb) < 0) {
10048 if (!mail_var_path_changed && statb.st_mtime != *mtp) {
10051 pathopt ? pathopt : "you have mail"
10054 *mtp = statb.st_mtime;
10056 mail_var_path_changed = 0;
10057 popstackmark(&smark);
10060 static void FAST_FUNC
10061 changemail(const char *val UNUSED_PARAM)
10063 mail_var_path_changed = 1;
10066 #endif /* ASH_MAIL */
10069 /* ============ ??? */
10072 * Set the shell parameters.
10075 setparam(char **argv)
10081 for (nparam = 0; argv[nparam]; nparam++)
10083 ap = newparam = ckmalloc((nparam + 1) * sizeof(*ap));
10085 *ap++ = ckstrdup(*argv++);
10088 freeparam(&shellparam);
10089 shellparam.malloced = 1;
10090 shellparam.nparam = nparam;
10091 shellparam.p = newparam;
10092 #if ENABLE_ASH_GETOPTS
10093 shellparam.optind = 1;
10094 shellparam.optoff = -1;
10099 * Process shell options. The global variable argptr contains a pointer
10100 * to the argument list; we advance it past the options.
10102 * SUSv3 section 2.8.1 "Consequences of Shell Errors" says:
10103 * For a non-interactive shell, an error condition encountered
10104 * by a special built-in ... shall cause the shell to write a diagnostic message
10105 * to standard error and exit as shown in the following table:
10106 * Error Special Built-In
10108 * Utility syntax error (option or operand error) Shall exit
10110 * However, in bug 1142 (http://busybox.net/bugs/view.php?id=1142)
10111 * we see that bash does not do that (set "finishes" with error code 1 instead,
10112 * and shell continues), and people rely on this behavior!
10114 * set -o barfoo 2>/dev/null
10117 * Oh well. Let's mimic that.
10120 plus_minus_o(char *name, int val)
10125 for (i = 0; i < NOPTS; i++) {
10126 if (strcmp(name, optnames(i)) == 0) {
10131 ash_msg("illegal option %co %s", val ? '-' : '+', name);
10134 for (i = 0; i < NOPTS; i++) {
10136 out1fmt("%-16s%s\n", optnames(i), optlist[i] ? "on" : "off");
10138 out1fmt("set %co %s\n", optlist[i] ? '-' : '+', optnames(i));
10144 setoption(int flag, int val)
10148 for (i = 0; i < NOPTS; i++) {
10149 if (optletters(i) == flag) {
10154 ash_msg_and_raise_error("illegal option %c%c", val ? '-' : '+', flag);
10158 options(int cmdline)
10166 while ((p = *argptr) != NULL) {
10168 if (c != '-' && c != '+')
10171 val = 0; /* val = 0 if c == '+' */
10174 if (p[0] == '\0' || LONE_DASH(p)) {
10176 /* "-" means turn off -x and -v */
10179 /* "--" means reset params */
10180 else if (*argptr == NULL)
10183 break; /* "-" or "--" terminates options */
10186 /* first char was + or - */
10187 while ((c = *p++) != '\0') {
10188 /* bash 3.2 indeed handles -c CMD and +c CMD the same */
10189 if (c == 'c' && cmdline) {
10190 minusc = p; /* command is after shell args */
10191 } else if (c == 'o') {
10192 if (plus_minus_o(*argptr, val)) {
10193 /* it already printed err message */
10194 return 1; /* error */
10198 } else if (cmdline && (c == 'l')) { /* -l or +l == --login */
10200 /* bash does not accept +-login, we also won't */
10201 } else if (cmdline && val && (c == '-')) { /* long options */
10202 if (strcmp(p, "login") == 0)
10214 * The shift builtin command.
10216 static int FAST_FUNC
10217 shiftcmd(int argc UNUSED_PARAM, char **argv)
10224 n = number(argv[1]);
10225 if (n > shellparam.nparam)
10226 n = 0; /* bash compat, was = shellparam.nparam; */
10228 shellparam.nparam -= n;
10229 for (ap1 = shellparam.p; --n >= 0; ap1++) {
10230 if (shellparam.malloced)
10233 ap2 = shellparam.p;
10234 while ((*ap2++ = *ap1++) != NULL)
10236 #if ENABLE_ASH_GETOPTS
10237 shellparam.optind = 1;
10238 shellparam.optoff = -1;
10245 * POSIX requires that 'set' (but not export or readonly) output the
10246 * variables in lexicographic order - by the locale's collating order (sigh).
10247 * Maybe we could keep them in an ordered balanced binary tree
10248 * instead of hashed lists.
10249 * For now just roll 'em through qsort for printing...
10252 showvars(const char *sep_prefix, int on, int off)
10255 char **ep, **epend;
10257 ep = listvars(on, off, &epend);
10258 qsort(ep, epend - ep, sizeof(char *), vpcmp);
10260 sep = *sep_prefix ? " " : sep_prefix;
10262 for (; ep < epend; ep++) {
10266 p = strchrnul(*ep, '=');
10269 q = single_quote(++p);
10270 out1fmt("%s%s%.*s%s\n", sep_prefix, sep, (int)(p - *ep), *ep, q);
10276 * The set command builtin.
10278 static int FAST_FUNC
10279 setcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
10284 return showvars(nullstr, 0, VUNSET);
10287 if (!options(0)) { /* if no parse error... */
10290 if (*argptr != NULL) {
10298 #if ENABLE_ASH_RANDOM_SUPPORT
10299 static void FAST_FUNC
10300 change_random(const char *value)
10304 if (value == NULL) {
10305 /* "get", generate */
10306 t = next_random(&random_gen);
10307 /* set without recursion */
10308 setvar(vrandom.var_text, utoa(t), VNOFUNC);
10309 vrandom.flags &= ~VNOFUNC;
10312 t = strtoul(value, NULL, 10);
10313 INIT_RANDOM_T(&random_gen, (t ? t : 1), t);
10318 #if ENABLE_ASH_GETOPTS
10320 getopts(char *optstr, char *optvar, char **optfirst, int *param_optind, int *optoff)
10329 if (*param_optind < 1)
10331 optnext = optfirst + *param_optind - 1;
10333 if (*param_optind <= 1 || *optoff < 0 || (int)strlen(optnext[-1]) < *optoff)
10336 p = optnext[-1] + *optoff;
10337 if (p == NULL || *p == '\0') {
10338 /* Current word is done, advance */
10340 if (p == NULL || *p != '-' || *++p == '\0') {
10347 if (LONE_DASH(p)) /* check for "--" */
10352 for (q = optstr; *q != c;) {
10354 if (optstr[0] == ':') {
10357 err |= setvarsafe("OPTARG", s, 0);
10359 fprintf(stderr, "Illegal option -%c\n", c);
10360 unsetvar("OPTARG");
10370 if (*p == '\0' && (p = *optnext) == NULL) {
10371 if (optstr[0] == ':') {
10374 err |= setvarsafe("OPTARG", s, 0);
10377 fprintf(stderr, "No arg for -%c option\n", c);
10378 unsetvar("OPTARG");
10386 err |= setvarsafe("OPTARG", p, 0);
10389 err |= setvarsafe("OPTARG", nullstr, 0);
10391 *optoff = p ? p - *(optnext - 1) : -1;
10392 *param_optind = optnext - optfirst + 1;
10393 fmtstr(s, sizeof(s), "%d", *param_optind);
10394 err |= setvarsafe("OPTIND", s, VNOFUNC);
10397 err |= setvarsafe(optvar, s, 0);
10401 flush_stdout_stderr();
10402 raise_exception(EXERROR);
10408 * The getopts builtin. Shellparam.optnext points to the next argument
10409 * to be processed. Shellparam.optptr points to the next character to
10410 * be processed in the current argument. If shellparam.optnext is NULL,
10411 * then it's the first time getopts has been called.
10413 static int FAST_FUNC
10414 getoptscmd(int argc, char **argv)
10419 ash_msg_and_raise_error("usage: getopts optstring var [arg]");
10421 optbase = shellparam.p;
10422 if (shellparam.optind > shellparam.nparam + 1) {
10423 shellparam.optind = 1;
10424 shellparam.optoff = -1;
10427 optbase = &argv[3];
10428 if (shellparam.optind > argc - 2) {
10429 shellparam.optind = 1;
10430 shellparam.optoff = -1;
10434 return getopts(argv[1], argv[2], optbase, &shellparam.optind,
10435 &shellparam.optoff);
10437 #endif /* ASH_GETOPTS */
10440 /* ============ Shell parser */
10443 struct heredoc *next; /* next here document in list */
10444 union node *here; /* redirection node */
10445 char *eofmark; /* string indicating end of input */
10446 smallint striptabs; /* if set, strip leading tabs */
10449 static smallint tokpushback; /* last token pushed back */
10450 static smallint parsebackquote; /* nonzero if we are inside backquotes */
10451 static smallint quoteflag; /* set if (part of) last token was quoted */
10452 static token_id_t lasttoken; /* last token read (integer id Txxx) */
10453 static struct heredoc *heredoclist; /* list of here documents to read */
10454 static char *wordtext; /* text of last word returned by readtoken */
10455 static struct nodelist *backquotelist;
10456 static union node *redirnode;
10457 static struct heredoc *heredoc;
10459 static const char *
10460 tokname(char *buf, int tok)
10463 return tokname_array[tok] + 1;
10464 sprintf(buf, "\"%s\"", tokname_array[tok] + 1);
10468 /* raise_error_unexpected_syntax:
10469 * Called when an unexpected token is read during the parse. The argument
10470 * is the token that is expected, or -1 if more than one type of token can
10471 * occur at this point.
10473 static void raise_error_unexpected_syntax(int) NORETURN;
10475 raise_error_unexpected_syntax(int token)
10481 l = sprintf(msg, "unexpected %s", tokname(buf, lasttoken));
10483 sprintf(msg + l, " (expecting %s)", tokname(buf, token));
10484 raise_error_syntax(msg);
10488 #define EOFMARKLEN 79
10490 /* parsing is heavily cross-recursive, need these forward decls */
10491 static union node *andor(void);
10492 static union node *pipeline(void);
10493 static union node *parse_command(void);
10494 static void parseheredoc(void);
10495 static char peektoken(void);
10496 static int readtoken(void);
10498 static union node *
10501 union node *n1, *n2, *n3;
10504 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10505 if (nlflag == 2 && peektoken())
10511 if (tok == TBACKGND) {
10512 if (n2->type == NPIPE) {
10513 n2->npipe.pipe_backgnd = 1;
10515 if (n2->type != NREDIR) {
10516 n3 = stzalloc(sizeof(struct nredir));
10518 /*n3->nredir.redirect = NULL; - stzalloc did it */
10521 n2->type = NBACKGND;
10527 n3 = stzalloc(sizeof(struct nbinary));
10529 n3->nbinary.ch1 = n1;
10530 n3->nbinary.ch2 = n2;
10546 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10554 pungetc(); /* push back EOF on input */
10558 raise_error_unexpected_syntax(-1);
10565 static union node *
10568 union node *n1, *n2, *n3;
10576 } else if (t == TOR) {
10582 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10584 n3 = stzalloc(sizeof(struct nbinary));
10586 n3->nbinary.ch1 = n1;
10587 n3->nbinary.ch2 = n2;
10592 static union node *
10595 union node *n1, *n2, *pipenode;
10596 struct nodelist *lp, *prev;
10600 TRACE(("pipeline: entered\n"));
10601 if (readtoken() == TNOT) {
10603 checkkwd = CHKKWD | CHKALIAS;
10606 n1 = parse_command();
10607 if (readtoken() == TPIPE) {
10608 pipenode = stzalloc(sizeof(struct npipe));
10609 pipenode->type = NPIPE;
10610 /*pipenode->npipe.pipe_backgnd = 0; - stzalloc did it */
10611 lp = stzalloc(sizeof(struct nodelist));
10612 pipenode->npipe.cmdlist = lp;
10616 lp = stzalloc(sizeof(struct nodelist));
10617 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10618 lp->n = parse_command();
10620 } while (readtoken() == TPIPE);
10626 n2 = stzalloc(sizeof(struct nnot));
10634 static union node *
10639 n = stzalloc(sizeof(struct narg));
10641 /*n->narg.next = NULL; - stzalloc did it */
10642 n->narg.text = wordtext;
10643 n->narg.backquote = backquotelist;
10648 fixredir(union node *n, const char *text, int err)
10652 TRACE(("Fix redir %s %d\n", text, err));
10654 n->ndup.vname = NULL;
10656 fd = bb_strtou(text, NULL, 10);
10657 if (!errno && fd >= 0)
10658 n->ndup.dupfd = fd;
10659 else if (LONE_DASH(text))
10660 n->ndup.dupfd = -1;
10663 raise_error_syntax("bad fd number");
10664 n->ndup.vname = makename();
10669 * Returns true if the text contains nothing to expand (no dollar signs
10673 noexpand(const char *text)
10677 while ((c = *text++) != '\0') {
10678 if (c == CTLQUOTEMARK)
10682 else if (SIT(c, BASESYNTAX) == CCTL)
10691 union node *n = redirnode;
10693 if (readtoken() != TWORD)
10694 raise_error_unexpected_syntax(-1);
10695 if (n->type == NHERE) {
10696 struct heredoc *here = heredoc;
10700 if (quoteflag == 0)
10702 TRACE(("Here document %d\n", n->type));
10703 if (!noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN)
10704 raise_error_syntax("illegal eof marker for << redirection");
10705 rmescapes(wordtext, 0);
10706 here->eofmark = wordtext;
10708 if (heredoclist == NULL)
10709 heredoclist = here;
10711 for (p = heredoclist; p->next; p = p->next)
10715 } else if (n->type == NTOFD || n->type == NFROMFD) {
10716 fixredir(n, wordtext, 0);
10718 n->nfile.fname = makename();
10722 static union node *
10725 union node *args, **app;
10726 union node *n = NULL;
10727 union node *vars, **vpp;
10728 union node **rpp, *redir;
10730 #if ENABLE_ASH_BASH_COMPAT
10731 smallint double_brackets_flag = 0;
10741 savecheckkwd = CHKALIAS;
10744 checkkwd = savecheckkwd;
10747 #if ENABLE_ASH_BASH_COMPAT
10748 case TAND: /* "&&" */
10749 case TOR: /* "||" */
10750 if (!double_brackets_flag) {
10754 wordtext = (char *) (t == TAND ? "-a" : "-o");
10757 n = stzalloc(sizeof(struct narg));
10759 /*n->narg.next = NULL; - stzalloc did it */
10760 n->narg.text = wordtext;
10761 #if ENABLE_ASH_BASH_COMPAT
10762 if (strcmp("[[", wordtext) == 0)
10763 double_brackets_flag = 1;
10764 else if (strcmp("]]", wordtext) == 0)
10765 double_brackets_flag = 0;
10767 n->narg.backquote = backquotelist;
10768 if (savecheckkwd && isassignment(wordtext)) {
10770 vpp = &n->narg.next;
10773 app = &n->narg.next;
10778 *rpp = n = redirnode;
10779 rpp = &n->nfile.next;
10780 parsefname(); /* read name of redirection file */
10783 if (args && app == &args->narg.next
10786 struct builtincmd *bcmd;
10789 /* We have a function */
10790 if (readtoken() != TRP)
10791 raise_error_unexpected_syntax(TRP);
10792 name = n->narg.text;
10793 if (!goodname(name)
10794 || ((bcmd = find_builtin(name)) && IS_BUILTIN_SPECIAL(bcmd))
10796 raise_error_syntax("bad function name");
10799 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10800 n->narg.next = parse_command();
10813 n = stzalloc(sizeof(struct ncmd));
10815 n->ncmd.args = args;
10816 n->ncmd.assign = vars;
10817 n->ncmd.redirect = redir;
10821 static union node *
10822 parse_command(void)
10824 union node *n1, *n2;
10825 union node *ap, **app;
10826 union node *cp, **cpp;
10827 union node *redir, **rpp;
10834 switch (readtoken()) {
10836 raise_error_unexpected_syntax(-1);
10839 n1 = stzalloc(sizeof(struct nif));
10841 n1->nif.test = list(0);
10842 if (readtoken() != TTHEN)
10843 raise_error_unexpected_syntax(TTHEN);
10844 n1->nif.ifpart = list(0);
10846 while (readtoken() == TELIF) {
10847 n2->nif.elsepart = stzalloc(sizeof(struct nif));
10848 n2 = n2->nif.elsepart;
10850 n2->nif.test = list(0);
10851 if (readtoken() != TTHEN)
10852 raise_error_unexpected_syntax(TTHEN);
10853 n2->nif.ifpart = list(0);
10855 if (lasttoken == TELSE)
10856 n2->nif.elsepart = list(0);
10858 n2->nif.elsepart = NULL;
10866 n1 = stzalloc(sizeof(struct nbinary));
10867 n1->type = (lasttoken == TWHILE) ? NWHILE : NUNTIL;
10868 n1->nbinary.ch1 = list(0);
10871 TRACE(("expecting DO got '%s' %s\n", tokname_array[got] + 1,
10872 got == TWORD ? wordtext : ""));
10873 raise_error_unexpected_syntax(TDO);
10875 n1->nbinary.ch2 = list(0);
10880 if (readtoken() != TWORD || quoteflag || !goodname(wordtext))
10881 raise_error_syntax("bad for loop variable");
10882 n1 = stzalloc(sizeof(struct nfor));
10884 n1->nfor.var = wordtext;
10885 checkkwd = CHKKWD | CHKALIAS;
10886 if (readtoken() == TIN) {
10888 while (readtoken() == TWORD) {
10889 n2 = stzalloc(sizeof(struct narg));
10891 /*n2->narg.next = NULL; - stzalloc did it */
10892 n2->narg.text = wordtext;
10893 n2->narg.backquote = backquotelist;
10895 app = &n2->narg.next;
10898 n1->nfor.args = ap;
10899 if (lasttoken != TNL && lasttoken != TSEMI)
10900 raise_error_unexpected_syntax(-1);
10902 n2 = stzalloc(sizeof(struct narg));
10904 /*n2->narg.next = NULL; - stzalloc did it */
10905 n2->narg.text = (char *)dolatstr;
10906 /*n2->narg.backquote = NULL;*/
10907 n1->nfor.args = n2;
10909 * Newline or semicolon here is optional (but note
10910 * that the original Bourne shell only allowed NL).
10912 if (lasttoken != TNL && lasttoken != TSEMI)
10915 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10916 if (readtoken() != TDO)
10917 raise_error_unexpected_syntax(TDO);
10918 n1->nfor.body = list(0);
10922 n1 = stzalloc(sizeof(struct ncase));
10924 if (readtoken() != TWORD)
10925 raise_error_unexpected_syntax(TWORD);
10926 n1->ncase.expr = n2 = stzalloc(sizeof(struct narg));
10928 /*n2->narg.next = NULL; - stzalloc did it */
10929 n2->narg.text = wordtext;
10930 n2->narg.backquote = backquotelist;
10932 checkkwd = CHKKWD | CHKALIAS;
10933 } while (readtoken() == TNL);
10934 if (lasttoken != TIN)
10935 raise_error_unexpected_syntax(TIN);
10936 cpp = &n1->ncase.cases;
10938 checkkwd = CHKNL | CHKKWD;
10940 while (t != TESAC) {
10941 if (lasttoken == TLP)
10943 *cpp = cp = stzalloc(sizeof(struct nclist));
10945 app = &cp->nclist.pattern;
10947 *app = ap = stzalloc(sizeof(struct narg));
10949 /*ap->narg.next = NULL; - stzalloc did it */
10950 ap->narg.text = wordtext;
10951 ap->narg.backquote = backquotelist;
10952 if (readtoken() != TPIPE)
10954 app = &ap->narg.next;
10957 //ap->narg.next = NULL;
10958 if (lasttoken != TRP)
10959 raise_error_unexpected_syntax(TRP);
10960 cp->nclist.body = list(2);
10962 cpp = &cp->nclist.next;
10964 checkkwd = CHKNL | CHKKWD;
10968 raise_error_unexpected_syntax(TENDCASE);
10975 n1 = stzalloc(sizeof(struct nredir));
10976 n1->type = NSUBSHELL;
10977 n1->nredir.n = list(0);
10978 /*n1->nredir.redirect = NULL; - stzalloc did it */
10988 return simplecmd();
10991 if (readtoken() != t)
10992 raise_error_unexpected_syntax(t);
10995 /* Now check for redirection which may follow command */
10996 checkkwd = CHKKWD | CHKALIAS;
10998 while (readtoken() == TREDIR) {
10999 *rpp = n2 = redirnode;
11000 rpp = &n2->nfile.next;
11006 if (n1->type != NSUBSHELL) {
11007 n2 = stzalloc(sizeof(struct nredir));
11012 n1->nredir.redirect = redir;
11017 #if ENABLE_ASH_BASH_COMPAT
11018 static int decode_dollar_squote(void)
11020 static const char C_escapes[] ALIGN1 = "nrbtfav""x\\01234567";
11026 p = strchr(C_escapes, c);
11031 if ((unsigned char)(c - '0') <= 7) { /* \ooo */
11035 } while ((unsigned char)(c - '0') <= 7 && --cnt);
11037 } else if (c == 'x') { /* \xHH */
11041 } while (isxdigit(c) && --cnt);
11043 if (cnt == 3) { /* \x but next char is "bad" */
11047 } else { /* simple seq like \\ or \t */
11052 c = bb_process_escape_sequence((void*)&p);
11053 } else { /* unrecognized "\z": print both chars unless ' or " */
11054 if (c != '\'' && c != '"') {
11056 c |= 0x100; /* "please encode \, then me" */
11064 * If eofmark is NULL, read a word or a redirection symbol. If eofmark
11065 * is not NULL, read a here document. In the latter case, eofmark is the
11066 * word which marks the end of the document and striptabs is true if
11067 * leading tabs should be stripped from the document. The argument c
11068 * is the first character of the input token or document.
11070 * Because C does not have internal subroutines, I have simulated them
11071 * using goto's to implement the subroutine linkage. The following macros
11072 * will run code that appears at the end of readtoken1.
11074 #define CHECKEND() {goto checkend; checkend_return:;}
11075 #define PARSEREDIR() {goto parseredir; parseredir_return:;}
11076 #define PARSESUB() {goto parsesub; parsesub_return:;}
11077 #define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;}
11078 #define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;}
11079 #define PARSEARITH() {goto parsearith; parsearith_return:;}
11081 readtoken1(int c, int syntax, char *eofmark, int striptabs)
11083 /* NB: syntax parameter fits into smallint */
11084 /* c parameter is an unsigned char or PEOF or PEOA */
11087 char line[EOFMARKLEN + 1];
11088 struct nodelist *bqlist;
11092 smallint prevsyntax; /* syntax before arithmetic */
11093 #if ENABLE_ASH_EXPAND_PRMT
11094 smallint pssyntax; /* we are expanding a prompt string */
11096 int varnest; /* levels of variables expansion */
11097 int arinest; /* levels of arithmetic expansion */
11098 int parenlevel; /* levels of parens in arithmetic */
11099 int dqvarnest; /* levels of variables expansion within double quotes */
11101 IF_ASH_BASH_COMPAT(smallint bash_dollar_squote = 0;)
11104 /* Avoid longjmp clobbering */
11110 (void) &parenlevel;
11113 (void) &prevsyntax;
11116 startlinno = g_parsefile->linno;
11120 #if ENABLE_ASH_EXPAND_PRMT
11121 pssyntax = (syntax == PSSYNTAX);
11125 dblquote = (syntax == DQSYNTAX);
11131 STARTSTACKSTR(out);
11133 /* For each line, until end of word */
11134 CHECKEND(); /* set c to PEOF if at end of here document */
11135 for (;;) { /* until end of line or end of word */
11136 CHECKSTRSPACE(4, out); /* permit 4 calls to USTPUTC */
11137 switch (SIT(c, syntax)) {
11138 case CNL: /* '\n' */
11139 if (syntax == BASESYNTAX)
11140 goto endword; /* exit outer loop */
11142 g_parsefile->linno++;
11143 setprompt_if(doprompt, 2);
11145 goto loop; /* continue outer loop */
11150 if (eofmark == NULL || dblquote)
11151 USTPUTC(CTLESC, out);
11152 #if ENABLE_ASH_BASH_COMPAT
11153 if (c == '\\' && bash_dollar_squote) {
11154 c = decode_dollar_squote();
11156 USTPUTC('\\', out);
11157 c = (unsigned char)c;
11163 case CBACK: /* backslash */
11164 c = pgetc_without_PEOA();
11166 USTPUTC(CTLESC, out);
11167 USTPUTC('\\', out);
11169 } else if (c == '\n') {
11170 setprompt_if(doprompt, 2);
11172 #if ENABLE_ASH_EXPAND_PRMT
11173 if (c == '$' && pssyntax) {
11174 USTPUTC(CTLESC, out);
11175 USTPUTC('\\', out);
11178 /* Backslash is retained if we are in "str" and next char isn't special */
11183 && (c != '"' || eofmark != NULL)
11185 USTPUTC(CTLESC, out);
11186 USTPUTC('\\', out);
11188 if (SIT(c, SQSYNTAX) == CCTL)
11189 USTPUTC(CTLESC, out);
11197 if (eofmark == NULL) {
11198 USTPUTC(CTLQUOTEMARK, out);
11206 IF_ASH_BASH_COMPAT(bash_dollar_squote = 0;)
11207 if (eofmark != NULL && arinest == 0
11212 if (dqvarnest == 0) {
11213 syntax = BASESYNTAX;
11220 case CVAR: /* '$' */
11221 PARSESUB(); /* parse substitution */
11223 case CENDVAR: /* '}' */
11226 if (dqvarnest > 0) {
11233 #if ENABLE_SH_MATH_SUPPORT
11234 case CLP: /* '(' in arithmetic */
11238 case CRP: /* ')' in arithmetic */
11239 if (parenlevel > 0) {
11242 if (pgetc() == ')') {
11243 if (--arinest == 0) {
11244 syntax = prevsyntax;
11245 dblquote = (syntax == DQSYNTAX);
11250 * unbalanced parens
11251 * (don't 2nd guess - no error)
11259 case CBQUOTE: /* '`' */
11263 goto endword; /* exit outer loop */
11267 if (varnest == 0) {
11268 #if ENABLE_ASH_BASH_COMPAT
11270 if (pgetc() == '>')
11271 c = 0x100 + '>'; /* flag &> */
11275 goto endword; /* exit outer loop */
11277 IF_ASH_ALIAS(if (c != PEOA))
11284 #if ENABLE_SH_MATH_SUPPORT
11285 if (syntax == ARISYNTAX)
11286 raise_error_syntax("missing '))'");
11288 if (syntax != BASESYNTAX && !parsebackquote && eofmark == NULL)
11289 raise_error_syntax("unterminated quoted string");
11290 if (varnest != 0) {
11291 startlinno = g_parsefile->linno;
11293 raise_error_syntax("missing '}'");
11295 USTPUTC('\0', out);
11296 len = out - (char *)stackblock();
11297 out = stackblock();
11298 if (eofmark == NULL) {
11299 if ((c == '>' || c == '<' IF_ASH_BASH_COMPAT( || c == 0x100 + '>'))
11302 if (isdigit_str9(out)) {
11303 PARSEREDIR(); /* passed as params: out, c */
11304 lasttoken = TREDIR;
11307 /* else: non-number X seen, interpret it
11308 * as "NNNX>file" = "NNNX >file" */
11312 quoteflag = quotef;
11313 backquotelist = bqlist;
11314 grabstackblock(len);
11318 /* end of readtoken routine */
11321 * Check to see whether we are at the end of the here document. When this
11322 * is called, c is set to the first character of the next input line. If
11323 * we are at the end of the here document, this routine sets the c to PEOF.
11327 #if ENABLE_ASH_ALIAS
11329 c = pgetc_without_PEOA();
11332 while (c == '\t') {
11333 c = pgetc_without_PEOA();
11336 if (c == *eofmark) {
11337 if (pfgets(line, sizeof(line)) != NULL) {
11341 for (q = eofmark + 1; *q && *p == *q; p++, q++)
11343 if (*p == '\n' && *q == '\0') {
11345 g_parsefile->linno++;
11346 needprompt = doprompt;
11348 pushstring(line, NULL);
11353 goto checkend_return;
11357 * Parse a redirection operator. The variable "out" points to a string
11358 * specifying the fd to be redirected. The variable "c" contains the
11359 * first character of the redirection operator.
11362 /* out is already checked to be a valid number or "" */
11363 int fd = (*out == '\0' ? -1 : atoi(out));
11366 np = stzalloc(sizeof(struct nfile));
11371 np->type = NAPPEND;
11373 np->type = NCLOBBER;
11376 /* it also can be NTO2 (>&file), but we can't figure it out yet */
11382 #if ENABLE_ASH_BASH_COMPAT
11383 else if (c == 0x100 + '>') { /* this flags &> redirection */
11385 pgetc(); /* this is '>', no need to check */
11389 else { /* c == '<' */
11390 /*np->nfile.fd = 0; - stzalloc did it */
11394 if (sizeof(struct nfile) != sizeof(struct nhere)) {
11395 np = stzalloc(sizeof(struct nhere));
11396 /*np->nfile.fd = 0; - stzalloc did it */
11399 heredoc = stzalloc(sizeof(struct heredoc));
11400 heredoc->here = np;
11403 heredoc->striptabs = 1;
11405 /*heredoc->striptabs = 0; - stzalloc did it */
11411 np->type = NFROMFD;
11415 np->type = NFROMTO;
11427 goto parseredir_return;
11431 * Parse a substitution. At this point, we have read the dollar sign
11432 * and nothing else.
11435 /* is_special(c) evaluates to 1 for c in "!#$*-0123456789?@"; 0 otherwise
11436 * (assuming ascii char codes, as the original implementation did) */
11437 #define is_special(c) \
11438 (((unsigned)(c) - 33 < 32) \
11439 && ((0xc1ff920dU >> ((unsigned)(c) - 33)) & 1))
11441 unsigned char subtype;
11446 if (c > 255 /* PEOA or PEOF */
11447 || (c != '(' && c != '{' && !is_name(c) && !is_special(c))
11449 #if ENABLE_ASH_BASH_COMPAT
11451 bash_dollar_squote = 1;
11456 } else if (c == '(') {
11457 /* $(command) or $((arith)) */
11458 if (pgetc() == '(') {
11459 #if ENABLE_SH_MATH_SUPPORT
11462 raise_error_syntax("you disabled math support for $((arith)) syntax");
11469 /* $VAR, $<specialchar>, ${...}, or PEOA/PEOF */
11470 USTPUTC(CTLVAR, out);
11471 typeloc = out - (char *)stackblock();
11472 USTPUTC(VSNORMAL, out);
11473 subtype = VSNORMAL;
11479 c = '#'; /* ${#} - same as $# */
11481 subtype = VSLENGTH; /* ${#VAR} */
11486 if (c <= 255 /* not PEOA or PEOF */ && is_name(c)) {
11487 /* $[{[#]]NAME[}] */
11491 } while (c <= 255 /* not PEOA or PEOF */ && is_in_name(c));
11492 } else if (isdigit(c)) {
11493 /* $[{[#]]NUM[}] */
11497 } while (isdigit(c));
11498 } else if (is_special(c)) {
11499 /* $[{[#]]<specialchar>[}] */
11504 raise_error_syntax("bad substitution");
11506 if (c != '}' && subtype == VSLENGTH) {
11507 /* ${#VAR didn't end with } */
11513 if (subtype == 0) {
11514 /* ${VAR...} but not $VAR or ${#VAR} */
11515 /* c == first char after VAR */
11519 #if ENABLE_ASH_BASH_COMPAT
11520 if (c == ':' || c == '$' || isdigit(c)) {
11521 //TODO: support more general format ${v:EXPR:EXPR},
11522 // where EXPR follows $(()) rules
11523 subtype = VSSUBSTR;
11525 break; /* "goto do_pungetc" is bigger (!) */
11531 static const char types[] ALIGN1 = "}-+?=";
11532 const char *p = strchr(types, c);
11535 subtype = p - types + VSNORMAL;
11541 subtype = (c == '#' ? VSTRIMLEFT : VSTRIMRIGHT);
11548 #if ENABLE_ASH_BASH_COMPAT
11550 /* ${v/[/]pattern/repl} */
11551 //TODO: encode pattern and repl separately.
11552 // Currently ${v/$var_with_slash/repl} is horribly broken
11553 subtype = VSREPLACE;
11557 subtype++; /* VSREPLACEALL */
11565 if (dblquote || arinest)
11567 ((unsigned char *)stackblock())[typeloc] = subtype | flags;
11568 if (subtype != VSNORMAL) {
11570 if (dblquote || arinest) {
11575 goto parsesub_return;
11579 * Called to parse command substitutions. Newstyle is set if the command
11580 * is enclosed inside $(...); nlpp is a pointer to the head of the linked
11581 * list of commands (passed by reference), and savelen is the number of
11582 * characters on the top of the stack which must be preserved.
11585 struct nodelist **nlpp;
11588 char *volatile str;
11589 struct jmploc jmploc;
11590 struct jmploc *volatile savehandler;
11592 smallint saveprompt = 0;
11595 (void) &saveprompt;
11597 savepbq = parsebackquote;
11598 if (setjmp(jmploc.loc)) {
11600 parsebackquote = 0;
11601 exception_handler = savehandler;
11602 longjmp(exception_handler->loc, 1);
11606 savelen = out - (char *)stackblock();
11608 str = ckmalloc(savelen);
11609 memcpy(str, stackblock(), savelen);
11611 savehandler = exception_handler;
11612 exception_handler = &jmploc;
11615 /* We must read until the closing backquote, giving special
11616 treatment to some slashes, and then push the string and
11617 reread it as input, interpreting it normally. */
11622 STARTSTACKSTR(pout);
11626 setprompt_if(needprompt, 2);
11635 g_parsefile->linno++;
11636 setprompt_if(doprompt, 2);
11638 * If eating a newline, avoid putting
11639 * the newline into the new character
11640 * stream (via the STPUTC after the
11645 if (pc != '\\' && pc != '`' && pc != '$'
11646 && (!dblquote || pc != '"')
11648 STPUTC('\\', pout);
11650 if (pc <= 255 /* not PEOA or PEOF */) {
11656 IF_ASH_ALIAS(case PEOA:)
11657 startlinno = g_parsefile->linno;
11658 raise_error_syntax("EOF in backquote substitution");
11661 g_parsefile->linno++;
11662 needprompt = doprompt;
11671 STPUTC('\0', pout);
11672 psavelen = pout - (char *)stackblock();
11673 if (psavelen > 0) {
11674 pstr = grabstackstr(pout);
11675 setinputstring(pstr);
11680 nlpp = &(*nlpp)->next;
11681 *nlpp = stzalloc(sizeof(**nlpp));
11682 /* (*nlpp)->next = NULL; - stzalloc did it */
11683 parsebackquote = oldstyle;
11686 saveprompt = doprompt;
11693 doprompt = saveprompt;
11694 else if (readtoken() != TRP)
11695 raise_error_unexpected_syntax(TRP);
11700 * Start reading from old file again, ignoring any pushed back
11701 * tokens left from the backquote parsing
11706 while (stackblocksize() <= savelen)
11708 STARTSTACKSTR(out);
11710 memcpy(out, str, savelen);
11711 STADJUST(savelen, out);
11717 parsebackquote = savepbq;
11718 exception_handler = savehandler;
11719 if (arinest || dblquote)
11720 USTPUTC(CTLBACKQ | CTLQUOTE, out);
11722 USTPUTC(CTLBACKQ, out);
11724 goto parsebackq_oldreturn;
11725 goto parsebackq_newreturn;
11728 #if ENABLE_SH_MATH_SUPPORT
11730 * Parse an arithmetic expansion (indicate start of one and set state)
11733 if (++arinest == 1) {
11734 prevsyntax = syntax;
11735 syntax = ARISYNTAX;
11736 USTPUTC(CTLARI, out);
11743 * we collapse embedded arithmetic expansion to
11744 * parenthesis, which should be equivalent
11748 goto parsearith_return;
11752 } /* end of readtoken */
11755 * Read the next input token.
11756 * If the token is a word, we set backquotelist to the list of cmds in
11757 * backquotes. We set quoteflag to true if any part of the word was
11759 * If the token is TREDIR, then we set redirnode to a structure containing
11761 * In all cases, the variable startlinno is set to the number of the line
11762 * on which the token starts.
11764 * [Change comment: here documents and internal procedures]
11765 * [Readtoken shouldn't have any arguments. Perhaps we should make the
11766 * word parsing code into a separate routine. In this case, readtoken
11767 * doesn't need to have any internal procedures, but parseword does.
11768 * We could also make parseoperator in essence the main routine, and
11769 * have parseword (readtoken1?) handle both words and redirection.]
11771 #define NEW_xxreadtoken
11772 #ifdef NEW_xxreadtoken
11773 /* singles must be first! */
11774 static const char xxreadtoken_chars[7] ALIGN1 = {
11775 '\n', '(', ')', /* singles */
11776 '&', '|', ';', /* doubles */
11780 #define xxreadtoken_singles 3
11781 #define xxreadtoken_doubles 3
11783 static const char xxreadtoken_tokens[] ALIGN1 = {
11784 TNL, TLP, TRP, /* only single occurrence allowed */
11785 TBACKGND, TPIPE, TSEMI, /* if single occurrence */
11786 TEOF, /* corresponds to trailing nul */
11787 TAND, TOR, TENDCASE /* if double occurrence */
11799 setprompt_if(needprompt, 2);
11800 startlinno = g_parsefile->linno;
11801 for (;;) { /* until token or start of word found */
11803 if (c == ' ' || c == '\t' IF_ASH_ALIAS( || c == PEOA))
11807 while ((c = pgetc()) != '\n' && c != PEOF)
11810 } else if (c == '\\') {
11811 if (pgetc() != '\n') {
11813 break; /* return readtoken1(...) */
11815 startlinno = ++g_parsefile->linno;
11816 setprompt_if(doprompt, 2);
11820 p = xxreadtoken_chars + sizeof(xxreadtoken_chars) - 1;
11823 g_parsefile->linno++;
11824 needprompt = doprompt;
11827 p = strchr(xxreadtoken_chars, c);
11829 break; /* return readtoken1(...) */
11831 if ((int)(p - xxreadtoken_chars) >= xxreadtoken_singles) {
11833 if (cc == c) { /* double occurrence? */
11834 p += xxreadtoken_doubles + 1;
11837 #if ENABLE_ASH_BASH_COMPAT
11838 if (c == '&' && cc == '>') /* &> */
11839 break; /* return readtoken1(...) */
11844 lasttoken = xxreadtoken_tokens[p - xxreadtoken_chars];
11849 return readtoken1(c, BASESYNTAX, (char *) NULL, 0);
11851 #else /* old xxreadtoken */
11852 #define RETURN(token) return lasttoken = token
11862 setprompt_if(needprompt, 2);
11863 startlinno = g_parsefile->linno;
11864 for (;;) { /* until token or start of word found */
11867 case ' ': case '\t':
11868 IF_ASH_ALIAS(case PEOA:)
11871 while ((c = pgetc()) != '\n' && c != PEOF)
11876 if (pgetc() == '\n') {
11877 startlinno = ++g_parsefile->linno;
11878 setprompt_if(doprompt, 2);
11884 g_parsefile->linno++;
11885 needprompt = doprompt;
11890 if (pgetc() == '&')
11895 if (pgetc() == '|')
11900 if (pgetc() == ';')
11913 return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
11916 #endif /* old xxreadtoken */
11923 smallint alreadyseen = tokpushback;
11926 #if ENABLE_ASH_ALIAS
11935 if (checkkwd & CHKNL) {
11942 if (t != TWORD || quoteflag) {
11947 * check for keywords
11949 if (checkkwd & CHKKWD) {
11950 const char *const *pp;
11952 pp = findkwd(wordtext);
11954 lasttoken = t = pp - tokname_array;
11955 TRACE(("keyword '%s' recognized\n", tokname_array[t] + 1));
11960 if (checkkwd & CHKALIAS) {
11961 #if ENABLE_ASH_ALIAS
11963 ap = lookupalias(wordtext, 1);
11966 pushstring(ap->val, ap);
11976 TRACE(("token '%s' %s\n", tokname_array[t] + 1, t == TWORD ? wordtext : ""));
11978 TRACE(("reread token '%s' %s\n", tokname_array[t] + 1, t == TWORD ? wordtext : ""));
11990 return tokname_array[t][0];
11994 * Read and parse a command. Returns NODE_EOF on end of file.
11995 * (NULL is a valid parse tree indicating a blank line.)
11997 static union node *
11998 parsecmd(int interact)
12003 doprompt = interact;
12004 setprompt_if(doprompt, doprompt);
12016 * Input any here documents.
12021 struct heredoc *here;
12024 here = heredoclist;
12025 heredoclist = NULL;
12028 setprompt_if(needprompt, 2);
12029 readtoken1(pgetc(), here->here->type == NHERE ? SQSYNTAX : DQSYNTAX,
12030 here->eofmark, here->striptabs);
12031 n = stzalloc(sizeof(struct narg));
12032 n->narg.type = NARG;
12033 /*n->narg.next = NULL; - stzalloc did it */
12034 n->narg.text = wordtext;
12035 n->narg.backquote = backquotelist;
12036 here->here->nhere.doc = n;
12043 * called by editline -- any expansions to the prompt should be added here.
12045 #if ENABLE_ASH_EXPAND_PRMT
12046 static const char *
12047 expandstr(const char *ps)
12051 /* XXX Fix (char *) cast. It _is_ a bug. ps is variable's value,
12052 * and token processing _can_ alter it (delete NULs etc). */
12053 setinputstring((char *)ps);
12054 readtoken1(pgetc(), PSSYNTAX, nullstr, 0);
12057 n.narg.type = NARG;
12058 n.narg.next = NULL;
12059 n.narg.text = wordtext;
12060 n.narg.backquote = backquotelist;
12062 expandarg(&n, NULL, 0);
12063 return stackblock();
12068 * Execute a command or commands contained in a string.
12071 evalstring(char *s, int mask)
12074 struct stackmark smark;
12078 setstackmark(&smark);
12081 while ((n = parsecmd(0)) != NODE_EOF) {
12083 popstackmark(&smark);
12096 * The eval command.
12098 static int FAST_FUNC
12099 evalcmd(int argc UNUSED_PARAM, char **argv)
12108 STARTSTACKSTR(concat);
12110 concat = stack_putstr(p, concat);
12114 STPUTC(' ', concat);
12116 STPUTC('\0', concat);
12117 p = grabstackstr(concat);
12119 evalstring(p, ~SKIPEVAL);
12125 * Read and execute commands.
12126 * "Top" is nonzero for the top level command loop;
12127 * it turns on prompting if the shell is interactive.
12133 struct stackmark smark;
12137 TRACE(("cmdloop(%d) called\n", top));
12141 setstackmark(&smark);
12144 showjobs(stderr, SHOW_CHANGED);
12147 if (iflag && top) {
12151 n = parsecmd(inter);
12153 if (DEBUG > 2 && debug && (n != NODE_EOF))
12156 if (n == NODE_EOF) {
12157 if (!top || numeof >= 50)
12159 if (!stoppedjobs()) {
12162 out2str("\nUse \"exit\" to leave shell.\n");
12165 } else if (nflag == 0) {
12166 /* job_warning can only be 2,1,0. Here 2->1, 1/0->0 */
12171 popstackmark(&smark);
12176 return skip & SKIPEVAL;
12183 * Take commands from a file. To be compatible we should do a path
12184 * search for the file, which is necessary to find sub-commands.
12187 find_dot_file(char *name)
12190 const char *path = pathval();
12193 /* don't try this for absolute or relative paths */
12194 if (strchr(name, '/'))
12197 /* IIRC standards do not say whether . is to be searched.
12198 * And it is even smaller this way, making it unconditional for now:
12200 if (1) { /* ENABLE_ASH_BASH_COMPAT */
12205 while ((fullname = path_advance(&path, name)) != NULL) {
12207 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
12209 * Don't bother freeing here, since it will
12210 * be freed by the caller.
12214 if (fullname != name)
12215 stunalloc(fullname);
12218 /* not found in the PATH */
12219 ash_msg_and_raise_error("%s: not found", name);
12223 static int FAST_FUNC
12224 dotcmd(int argc, char **argv)
12227 struct strlist *sp;
12228 volatile struct shparam saveparam;
12230 for (sp = cmdenviron; sp; sp = sp->next)
12231 setvareq(ckstrdup(sp->text), VSTRFIXED | VTEXTFIXED);
12234 /* bash says: "bash: .: filename argument required" */
12235 return 2; /* bash compat */
12238 /* "false; . empty_file; echo $?" should print 0, not 1: */
12241 fullname = find_dot_file(argv[1]);
12245 if (argc) { /* argc > 0, argv[0] != NULL */
12246 saveparam = shellparam;
12247 shellparam.malloced = 0;
12248 shellparam.nparam = argc;
12249 shellparam.p = argv;
12252 setinputfile(fullname, INPUT_PUSH_FILE);
12253 commandname = fullname;
12258 freeparam(&shellparam);
12259 shellparam = saveparam;
12265 static int FAST_FUNC
12266 exitcmd(int argc UNUSED_PARAM, char **argv)
12271 exitstatus = number(argv[1]);
12272 raise_exception(EXEXIT);
12277 * Read a file containing shell functions.
12280 readcmdfile(char *name)
12282 setinputfile(name, INPUT_PUSH_FILE);
12288 /* ============ find_command inplementation */
12291 * Resolve a command name. If you change this routine, you may have to
12292 * change the shellexec routine as well.
12295 find_command(char *name, struct cmdentry *entry, int act, const char *path)
12297 struct tblentry *cmdp;
12304 struct builtincmd *bcmd;
12306 /* If name contains a slash, don't use PATH or hash table */
12307 if (strchr(name, '/') != NULL) {
12308 entry->u.index = -1;
12309 if (act & DO_ABS) {
12310 while (stat(name, &statb) < 0) {
12312 if (errno == EINTR)
12315 entry->cmdtype = CMDUNKNOWN;
12319 entry->cmdtype = CMDNORMAL;
12323 /* #if ENABLE_FEATURE_SH_STANDALONE... moved after builtin check */
12325 updatetbl = (path == pathval());
12328 if (strstr(path, "%builtin") != NULL)
12329 act |= DO_ALTBLTIN;
12332 /* If name is in the table, check answer will be ok */
12333 cmdp = cmdlookup(name, 0);
12334 if (cmdp != NULL) {
12337 switch (cmdp->cmdtype) {
12355 } else if (cmdp->rehash == 0)
12356 /* if not invalidated by cd, we're done */
12360 /* If %builtin not in path, check for builtin next */
12361 bcmd = find_builtin(name);
12363 if (IS_BUILTIN_REGULAR(bcmd))
12364 goto builtin_success;
12365 if (act & DO_ALTPATH) {
12366 if (!(act & DO_ALTBLTIN))
12367 goto builtin_success;
12368 } else if (builtinloc <= 0) {
12369 goto builtin_success;
12373 #if ENABLE_FEATURE_SH_STANDALONE
12375 int applet_no = find_applet_by_name(name);
12376 if (applet_no >= 0) {
12377 entry->cmdtype = CMDNORMAL;
12378 entry->u.index = -2 - applet_no;
12384 /* We have to search path. */
12385 prev = -1; /* where to start */
12386 if (cmdp && cmdp->rehash) { /* doing a rehash */
12387 if (cmdp->cmdtype == CMDBUILTIN)
12390 prev = cmdp->param.index;
12396 while ((fullname = path_advance(&path, name)) != NULL) {
12397 stunalloc(fullname);
12398 /* NB: code below will still use fullname
12399 * despite it being "unallocated" */
12402 if (prefix(pathopt, "builtin")) {
12404 goto builtin_success;
12407 if ((act & DO_NOFUNC)
12408 || !prefix(pathopt, "func")
12409 ) { /* ignore unimplemented options */
12413 /* if rehash, don't redo absolute path names */
12414 if (fullname[0] == '/' && idx <= prev) {
12417 TRACE(("searchexec \"%s\": no change\n", name));
12420 while (stat(fullname, &statb) < 0) {
12422 if (errno == EINTR)
12425 if (errno != ENOENT && errno != ENOTDIR)
12429 e = EACCES; /* if we fail, this will be the error */
12430 if (!S_ISREG(statb.st_mode))
12432 if (pathopt) { /* this is a %func directory */
12433 stalloc(strlen(fullname) + 1);
12434 /* NB: stalloc will return space pointed by fullname
12435 * (because we don't have any intervening allocations
12436 * between stunalloc above and this stalloc) */
12437 readcmdfile(fullname);
12438 cmdp = cmdlookup(name, 0);
12439 if (cmdp == NULL || cmdp->cmdtype != CMDFUNCTION)
12440 ash_msg_and_raise_error("%s not defined in %s", name, fullname);
12441 stunalloc(fullname);
12444 TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
12446 entry->cmdtype = CMDNORMAL;
12447 entry->u.index = idx;
12451 cmdp = cmdlookup(name, 1);
12452 cmdp->cmdtype = CMDNORMAL;
12453 cmdp->param.index = idx;
12458 /* We failed. If there was an entry for this command, delete it */
12459 if (cmdp && updatetbl)
12460 delete_cmd_entry();
12462 ash_msg("%s: %s", name, errmsg(e, "not found"));
12463 entry->cmdtype = CMDUNKNOWN;
12468 entry->cmdtype = CMDBUILTIN;
12469 entry->u.cmd = bcmd;
12473 cmdp = cmdlookup(name, 1);
12474 cmdp->cmdtype = CMDBUILTIN;
12475 cmdp->param.cmd = bcmd;
12479 entry->cmdtype = cmdp->cmdtype;
12480 entry->u = cmdp->param;
12484 /* ============ trap.c */
12487 * The trap builtin.
12489 static int FAST_FUNC
12490 trapcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12494 int signo, exitcode;
12499 for (signo = 0; signo < NSIG; signo++) {
12500 char *tr = trap_ptr[signo];
12502 /* note: bash adds "SIG", but only if invoked
12503 * as "bash". If called as "sh", or if set -o posix,
12504 * then it prints short signal names.
12505 * We are printing short names: */
12506 out1fmt("trap -- %s %s\n",
12508 get_signame(signo));
12509 /* trap_ptr != trap only if we are in special-cased `trap` code.
12510 * In this case, we will exit very soon, no need to free(). */
12511 /* if (trap_ptr != trap && tp[0]) */
12516 if (trap_ptr != trap) {
12529 signo = get_signum(*ap);
12531 /* Mimic bash message exactly */
12532 ash_msg("%s: invalid signal specification", *ap);
12538 if (LONE_DASH(action))
12541 action = ckstrdup(action);
12545 may_have_traps = 1;
12546 trap[signo] = action;
12557 /* ============ Builtins */
12559 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
12561 * Lists available builtins
12563 static int FAST_FUNC
12564 helpcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12570 "Built-in commands:\n"
12571 "------------------\n");
12572 for (col = 0, i = 0; i < ARRAY_SIZE(builtintab); i++) {
12573 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '),
12574 builtintab[i].name + 1);
12580 #if ENABLE_FEATURE_SH_STANDALONE
12582 const char *a = applet_names;
12584 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '), a);
12589 a += strlen(a) + 1;
12594 return EXIT_SUCCESS;
12596 #endif /* FEATURE_SH_EXTRA_QUIET */
12599 * The export and readonly commands.
12601 static int FAST_FUNC
12602 exportcmd(int argc UNUSED_PARAM, char **argv)
12608 int flag = argv[0][0] == 'r' ? VREADONLY : VEXPORT;
12610 if (nextopt("p") != 'p') {
12615 p = strchr(name, '=');
12619 vp = *findvar(hashvar(name), name);
12625 setvar(name, p, flag);
12626 } while ((name = *++aptr) != NULL);
12630 showvars(argv[0], flag, 0);
12635 * Delete a function if it exists.
12638 unsetfunc(const char *name)
12640 struct tblentry *cmdp;
12642 cmdp = cmdlookup(name, 0);
12643 if (cmdp != NULL && cmdp->cmdtype == CMDFUNCTION)
12644 delete_cmd_entry();
12648 * The unset builtin command. We unset the function before we unset the
12649 * variable to allow a function to be unset when there is a readonly variable
12650 * with the same name.
12652 static int FAST_FUNC
12653 unsetcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12660 while ((i = nextopt("vf")) != 0) {
12664 for (ap = argptr; *ap; ap++) {
12677 static const unsigned char timescmd_str[] ALIGN1 = {
12678 ' ', offsetof(struct tms, tms_utime),
12679 '\n', offsetof(struct tms, tms_stime),
12680 ' ', offsetof(struct tms, tms_cutime),
12681 '\n', offsetof(struct tms, tms_cstime),
12684 static int FAST_FUNC
12685 timescmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12687 unsigned long clk_tck, s, t;
12688 const unsigned char *p;
12691 clk_tck = sysconf(_SC_CLK_TCK);
12696 t = *(clock_t *)(((char *) &buf) + p[1]);
12699 out1fmt("%lum%lu.%03lus%c",
12701 (t * 1000) / clk_tck,
12709 #if ENABLE_SH_MATH_SUPPORT
12711 * The let builtin. Partially stolen from GNU Bash, the Bourne Again SHell.
12712 * Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
12714 * Copyright (C) 2003 Vladimir Oleynik <dzo@simtreas.ru>
12716 static int FAST_FUNC
12717 letcmd(int argc UNUSED_PARAM, char **argv)
12723 ash_msg_and_raise_error("expression expected");
12725 i = ash_arith(*argv);
12733 * The read builtin. Options:
12734 * -r Do not interpret '\' specially
12735 * -s Turn off echo (tty only)
12736 * -n NCHARS Read NCHARS max
12737 * -p PROMPT Display PROMPT on stderr (if input is from tty)
12738 * -t SECONDS Timeout after SECONDS (tty or pipe only)
12739 * -u FD Read from given FD instead of fd 0
12740 * This uses unbuffered input, which may be avoidable in some cases.
12741 * TODO: bash also has:
12742 * -a ARRAY Read into array[0],[1],etc
12743 * -d DELIM End on DELIM char, not newline
12744 * -e Use line editing (tty only)
12746 static int FAST_FUNC
12747 readcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12749 char *opt_n = NULL;
12750 char *opt_p = NULL;
12751 char *opt_t = NULL;
12752 char *opt_u = NULL;
12753 int read_flags = 0;
12757 while ((i = nextopt("p:u:rt:n:s")) != '\0') {
12766 read_flags |= BUILTIN_READ_SILENT;
12772 read_flags |= BUILTIN_READ_RAW;
12782 r = shell_builtin_read(setvar2,
12784 bltinlookup("IFS"), /* can be NULL */
12792 if ((uintptr_t)r > 1)
12793 ash_msg_and_raise_error(r);
12795 return (uintptr_t)r;
12798 static int FAST_FUNC
12799 umaskcmd(int argc UNUSED_PARAM, char **argv)
12801 static const char permuser[3] ALIGN1 = "ugo";
12802 static const char permmode[3] ALIGN1 = "rwx";
12803 static const short permmask[] ALIGN2 = {
12804 S_IRUSR, S_IWUSR, S_IXUSR,
12805 S_IRGRP, S_IWGRP, S_IXGRP,
12806 S_IROTH, S_IWOTH, S_IXOTH
12809 /* TODO: use bb_parse_mode() instead */
12814 int symbolic_mode = 0;
12816 while (nextopt("S") != '\0') {
12827 if (symbolic_mode) {
12831 for (i = 0; i < 3; i++) {
12834 *p++ = permuser[i];
12836 for (j = 0; j < 3; j++) {
12837 if ((mask & permmask[3 * i + j]) == 0) {
12838 *p++ = permmode[j];
12846 out1fmt("%.4o\n", mask);
12849 if (isdigit((unsigned char) *ap)) {
12852 if (*ap >= '8' || *ap < '0')
12853 ash_msg_and_raise_error(msg_illnum, argv[1]);
12854 mask = (mask << 3) + (*ap - '0');
12855 } while (*++ap != '\0');
12858 mask = ~mask & 0777;
12859 if (!bb_parse_mode(ap, &mask)) {
12860 ash_msg_and_raise_error("illegal mode: %s", ap);
12862 umask(~mask & 0777);
12868 static int FAST_FUNC
12869 ulimitcmd(int argc UNUSED_PARAM, char **argv)
12871 return shell_builtin_ulimit(argv);
12874 /* ============ main() and helpers */
12877 * Called to exit the shell.
12886 status = exitstatus;
12887 TRACE(("pid %d, exitshell(%d)\n", getpid(), status));
12888 if (setjmp(loc.loc)) {
12889 if (exception_type == EXEXIT)
12890 /* dash bug: it just does _exit(exitstatus) here
12891 * but we have to do setjobctl(0) first!
12892 * (bug is still not fixed in dash-0.5.3 - if you run dash
12893 * under Midnight Commander, on exit from dash MC is backgrounded) */
12894 status = exitstatus;
12897 exception_handler = &loc;
12904 flush_stdout_stderr();
12914 /* from input.c: */
12915 /* we will never free this */
12916 basepf.next_to_pgetc = basepf.buf = ckmalloc(IBUFSIZ);
12919 signal(SIGCHLD, SIG_DFL);
12920 /* bash re-enables SIGHUP which is SIG_IGNed on entry.
12921 * Try: "trap '' HUP; bash; echo RET" and type "kill -HUP $$"
12923 signal(SIGHUP, SIG_DFL);
12929 struct stat st1, st2;
12932 for (envp = environ; envp && *envp; envp++) {
12933 if (strchr(*envp, '=')) {
12934 setvareq(*envp, VEXPORT|VTEXTFIXED);
12938 setvar("PPID", utoa(getppid()), 0);
12940 p = lookupvar("PWD");
12942 if (*p != '/' || stat(p, &st1) || stat(".", &st2)
12943 || st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino)
12950 * Process the shell command line arguments.
12953 procargs(char **argv)
12956 const char *xminusc;
12961 /* if (xargv[0]) - mmm, this is always true! */
12963 for (i = 0; i < NOPTS; i++)
12967 /* it already printed err message */
12968 raise_exception(EXERROR);
12972 if (*xargv == NULL) {
12974 ash_msg_and_raise_error(bb_msg_requires_arg, "-c");
12977 if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
12981 for (i = 0; i < NOPTS; i++)
12982 if (optlist[i] == 2)
12987 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
12992 } else if (!sflag) {
12993 setinputfile(*xargv, 0);
12996 commandname = arg0;
12999 shellparam.p = xargv;
13000 #if ENABLE_ASH_GETOPTS
13001 shellparam.optind = 1;
13002 shellparam.optoff = -1;
13004 /* assert(shellparam.malloced == 0 && shellparam.nparam == 0); */
13006 shellparam.nparam++;
13013 * Read /etc/profile or .profile.
13016 read_profile(const char *name)
13020 if (setinputfile(name, INPUT_PUSH_FILE | INPUT_NOFILE_OK) < 0)
13029 * This routine is called when an error or an interrupt occurs in an
13030 * interactive shell and control is returned to the main command loop.
13038 /* from input.c: */
13039 g_parsefile->left_in_buffer = 0;
13040 g_parsefile->left_in_line = 0; /* clear input buffer */
13042 /* from parser.c: */
13045 /* from redir.c: */
13046 clearredir(/*drop:*/ 0);
13050 static short profile_buf[16384];
13051 extern int etext();
13055 * Main routine. We initialize things, parse the arguments, execute
13056 * profiles if we're a login shell, and then call cmdloop to execute
13057 * commands. The setjmp call sets up the location to jump to when an
13058 * exception occurs. When an exception occurs the variable "state"
13059 * is used to figure out how far we had gotten.
13061 int ash_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
13062 int ash_main(int argc UNUSED_PARAM, char **argv)
13064 const char *shinit;
13065 volatile smallint state;
13066 struct jmploc jmploc;
13067 struct stackmark smark;
13069 /* Initialize global data */
13073 #if ENABLE_ASH_ALIAS
13079 monitor(4, etext, profile_buf, sizeof(profile_buf), 50);
13082 #if ENABLE_FEATURE_EDITING
13083 line_input_state = new_line_input_t(FOR_SHELL | WITH_PATH_LOOKUP);
13086 if (setjmp(jmploc.loc)) {
13092 e = exception_type;
13096 if (e == EXEXIT || s == 0 || iflag == 0 || shlvl) {
13100 outcslow('\n', stderr);
13103 popstackmark(&smark);
13104 FORCE_INT_ON; /* enable interrupts */
13113 exception_handler = &jmploc;
13116 TRACE(("Shell args: "));
13117 trace_puts_args(argv);
13119 rootpid = getpid();
13122 setstackmark(&smark);
13125 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
13127 const char *hp = lookupvar("HISTFILE");
13130 hp = lookupvar("HOME");
13132 char *defhp = concat_path_file(hp, ".ash_history");
13133 setvar("HISTFILE", defhp, 0);
13139 if (argv[0] && argv[0][0] == '-')
13143 read_profile("/etc/profile");
13146 read_profile(".profile");
13152 getuid() == geteuid() && getgid() == getegid() &&
13156 shinit = lookupvar("ENV");
13157 if (shinit != NULL && *shinit != '\0') {
13158 read_profile(shinit);
13164 /* evalstring pushes parsefile stack.
13165 * Ensure we don't falsely claim that 0 (stdin)
13166 * is one of stacked source fds.
13167 * Testcase: ash -c 'exec 1>&0' must not complain. */
13168 // if (!sflag) g_parsefile->pf_fd = -1;
13169 // ^^ not necessary since now we special-case fd 0
13170 // in is_hidden_fd() to not be considered "hidden fd"
13171 evalstring(minusc, 0);
13174 if (sflag || minusc == NULL) {
13175 #if defined MAX_HISTORY && MAX_HISTORY > 0 && ENABLE_FEATURE_EDITING_SAVEHISTORY
13177 const char *hp = lookupvar("HISTFILE");
13179 line_input_state->hist_file = hp;
13182 state4: /* XXX ??? - why isn't this before the "if" statement */
13190 extern void _mcleanup(void);
13194 TRACE(("End of main reached\n"));
13201 * Copyright (c) 1989, 1991, 1993, 1994
13202 * The Regents of the University of California. All rights reserved.
13204 * This code is derived from software contributed to Berkeley by
13205 * Kenneth Almquist.
13207 * Redistribution and use in source and binary forms, with or without
13208 * modification, are permitted provided that the following conditions
13210 * 1. Redistributions of source code must retain the above copyright
13211 * notice, this list of conditions and the following disclaimer.
13212 * 2. Redistributions in binary form must reproduce the above copyright
13213 * notice, this list of conditions and the following disclaimer in the
13214 * documentation and/or other materials provided with the distribution.
13215 * 3. Neither the name of the University nor the names of its contributors
13216 * may be used to endorse or promote products derived from this software
13217 * without specific prior written permission.
13219 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
13220 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
13221 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
13222 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
13223 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
13224 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
13225 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
13226 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
13227 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
13228 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF