1 /* vi: set sw=4 ts=4: */
3 * ash shell port for busybox
5 * This code is derived from software contributed to Berkeley by
8 * Original BSD copyright notice is retained at the end of this file.
10 * Copyright (c) 1989, 1991, 1993, 1994
11 * The Regents of the University of California. All rights reserved.
13 * Copyright (c) 1997-2005 Herbert Xu <herbert@gondor.apana.org.au>
14 * was re-ported from NetBSD and debianized.
16 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
20 * The following should be set to reflect the type of system you have:
21 * JOBS -> 1 if you have Berkeley job control, 0 otherwise.
22 * define SYSV if you are running under System V.
23 * define DEBUG=1 to compile in debugging ('set -o debug' to turn on)
24 * define DEBUG=2 to compile in and turn on debugging.
26 * When debugging is on (DEBUG is 1 and "set -o debug" was executed),
27 * debugging info will be written to ./trace and a quit signal
28 * will generate a core dump.
31 /* Tweak debug output verbosity here */
38 #define JOBS ENABLE_ASH_JOB_CONTROL
42 #include <sys/times.h>
43 #include <sys/utsname.h> /* for setting $HOSTNAME */
45 #include "busybox.h" /* for applet_names */
47 #if defined(__ANDROID_API__) && __ANDROID_API__ <= 24
48 /* Bionic at least up to version 24 has no glob() */
49 # undef ENABLE_ASH_INTERNAL_GLOB
50 # define ENABLE_ASH_INTERNAL_GLOB 1
53 #if !ENABLE_ASH_INTERNAL_GLOB
58 #include "shell_common.h"
59 #if ENABLE_SH_MATH_SUPPORT
62 #if ENABLE_ASH_RANDOM_SUPPORT
65 # define CLEAR_RANDOM_T(rnd) ((void)0)
68 #include "NUM_APPLETS.h"
70 /* STANDALONE does not make sense, and won't compile */
71 # undef CONFIG_FEATURE_SH_STANDALONE
72 # undef ENABLE_FEATURE_SH_STANDALONE
73 # undef IF_FEATURE_SH_STANDALONE
74 # undef IF_NOT_FEATURE_SH_STANDALONE
75 # define ENABLE_FEATURE_SH_STANDALONE 0
76 # define IF_FEATURE_SH_STANDALONE(...)
77 # define IF_NOT_FEATURE_SH_STANDALONE(...) __VA_ARGS__
81 # define PIPE_BUF 4096 /* amount of buffering in a pipe */
85 # error "Do not even bother, ash will not run on NOMMU machine"
91 //config: depends on !NOMMU
93 //config: Tha 'ash' shell adds about 60k in the default configuration and is
94 //config: the most complete and most pedantically correct shell included with
95 //config: busybox. This shell is actually a derivative of the Debian 'dash'
96 //config: shell (by Herbert Xu), which was created by porting the 'ash' shell
97 //config: (written by Kenneth Almquist) from NetBSD.
99 //config:config ASH_OPTIMIZE_FOR_SIZE
100 //config: bool "Optimize for size instead of speed"
102 //config: depends on ASH
104 //config: Compile ash for reduced size at the price of speed.
106 //config:config ASH_INTERNAL_GLOB
107 //config: bool "Use internal glob() implementation"
109 //config: depends on ASH
111 //config: Do not use glob() function from libc, use internal implementation.
112 //config: Use this if you are getting "glob.h: No such file or directory"
113 //config: or similar build errors.
115 //config:config ASH_RANDOM_SUPPORT
116 //config: bool "Pseudorandom generator and $RANDOM variable"
118 //config: depends on ASH
120 //config: Enable pseudorandom generator and dynamic variable "$RANDOM".
121 //config: Each read of "$RANDOM" will generate a new pseudorandom value.
122 //config: You can reset the generator by using a specified start value.
123 //config: After "unset RANDOM" the generator will switch off and this
124 //config: variable will no longer have special treatment.
126 //config:config ASH_EXPAND_PRMT
127 //config: bool "Expand prompt string"
129 //config: depends on ASH
131 //config: "PS#" may contain volatile content, such as backquote commands.
132 //config: This option recreates the prompt string from the environment
133 //config: variable each time it is displayed.
135 //config:config ASH_BASH_COMPAT
136 //config: bool "bash-compatible extensions"
138 //config: depends on ASH
140 //config: Enable bash-compatible extensions.
142 //config:config ASH_IDLE_TIMEOUT
143 //config: bool "Idle timeout variable"
145 //config: depends on ASH
147 //config: Enables bash-like auto-logout after $TMOUT seconds of idle time.
149 //config:config ASH_JOB_CONTROL
150 //config: bool "Job control"
152 //config: depends on ASH
154 //config: Enable job control in the ash shell.
156 //config:config ASH_ALIAS
157 //config: bool "Alias support"
159 //config: depends on ASH
161 //config: Enable alias support in the ash shell.
163 //config:config ASH_GETOPTS
164 //config: bool "Builtin getopt to parse positional parameters"
166 //config: depends on ASH
168 //config: Enable support for getopts builtin in ash.
170 //config:config ASH_BUILTIN_ECHO
171 //config: bool "Builtin version of 'echo'"
173 //config: depends on ASH
175 //config: Enable support for echo builtin in ash.
177 //config:config ASH_BUILTIN_PRINTF
178 //config: bool "Builtin version of 'printf'"
180 //config: depends on ASH
182 //config: Enable support for printf builtin in ash.
184 //config:config ASH_BUILTIN_TEST
185 //config: bool "Builtin version of 'test'"
187 //config: depends on ASH
189 //config: Enable support for test builtin in ash.
191 //config:config ASH_HELP
192 //config: bool "help builtin"
194 //config: depends on ASH
196 //config: Enable help builtin in ash.
198 //config:config ASH_CMDCMD
199 //config: bool "'command' command to override shell builtins"
201 //config: depends on ASH
203 //config: Enable support for the ash 'command' builtin, which allows
204 //config: you to run the specified command with the specified arguments,
205 //config: even when there is an ash builtin command with the same name.
207 //config:config ASH_MAIL
208 //config: bool "Check for new mail on interactive shells"
210 //config: depends on ASH
212 //config: Enable "check for new mail" function in the ash shell.
215 //applet:IF_ASH(APPLET(ash, BB_DIR_BIN, BB_SUID_DROP))
216 //applet:IF_FEATURE_SH_IS_ASH(APPLET_ODDNAME(sh, ash, BB_DIR_BIN, BB_SUID_DROP, sh))
217 //applet:IF_FEATURE_BASH_IS_ASH(APPLET_ODDNAME(bash, ash, BB_DIR_BIN, BB_SUID_DROP, bash))
219 //kbuild:lib-$(CONFIG_ASH) += ash.o ash_ptr_hack.o shell_common.o
220 //kbuild:lib-$(CONFIG_ASH_RANDOM_SUPPORT) += random.o
223 /* ============ Hash table sizes. Configurable. */
227 #define CMDTABLESIZE 31 /* should be prime */
230 /* ============ Shell options */
232 static const char *const optletters_optnames[] = {
247 #if ENABLE_ASH_BASH_COMPAT
256 #define optletters(n) optletters_optnames[n][0]
257 #define optnames(n) (optletters_optnames[n] + 1)
259 enum { NOPTS = ARRAY_SIZE(optletters_optnames) };
262 /* ============ Misc data */
264 #define msg_illnum "Illegal number: %s"
267 * We enclose jmp_buf in a structure so that we can declare pointers to
268 * jump locations. The global variable handler contains the location to
269 * jump to when an exception occurs, and the global variable exception_type
270 * contains a code identifying the exception. To implement nested
271 * exception handlers, the user should save the value of handler on entry
272 * to an inner scope, set handler to point to a jmploc structure for the
273 * inner scope, and restore handler on exit from the scope.
279 struct globals_misc {
280 uint8_t exitstatus; /* exit status of last command */
281 uint8_t back_exitstatus;/* exit status of backquoted command */
282 smallint job_warning; /* user was warned about stopped jobs (can be 2, 1 or 0). */
283 int rootpid; /* pid of main shell */
284 /* shell level: 0 for the main shell, 1 for its children, and so on */
286 #define rootshell (!shlvl)
287 char *minusc; /* argument to -c option */
289 char *curdir; // = nullstr; /* current working directory */
290 char *physdir; // = nullstr; /* physical working directory */
292 char *arg0; /* value of $0 */
294 struct jmploc *exception_handler;
296 volatile int suppress_int; /* counter */
297 volatile /*sig_atomic_t*/ smallint pending_int; /* 1 = got SIGINT */
298 /* last pending signal */
299 volatile /*sig_atomic_t*/ smallint pending_sig;
300 smallint exception_type; /* kind of exception (0..5) */
302 #define EXINT 0 /* SIGINT received */
303 #define EXERROR 1 /* a generic error */
304 #define EXEXIT 4 /* exit the shell */
305 #define EXSIG 5 /* trapped signal in wait(1) */
308 char nullstr[1]; /* zero length string */
311 #define eflag optlist[0]
312 #define fflag optlist[1]
313 #define Iflag optlist[2]
314 #define iflag optlist[3]
315 #define mflag optlist[4]
316 #define nflag optlist[5]
317 #define sflag optlist[6]
318 #define xflag optlist[7]
319 #define vflag optlist[8]
320 #define Cflag optlist[9]
321 #define aflag optlist[10]
322 #define bflag optlist[11]
323 #define uflag optlist[12]
324 #define viflag optlist[13]
325 #if ENABLE_ASH_BASH_COMPAT
326 # define pipefail optlist[14]
331 # define nolog optlist[14 + ENABLE_ASH_BASH_COMPAT]
332 # define debug optlist[15 + ENABLE_ASH_BASH_COMPAT]
335 /* trap handler commands */
337 * Sigmode records the current value of the signal handlers for the various
338 * modes. A value of zero means that the current handler is not known.
339 * S_HARD_IGN indicates that the signal was ignored on entry to the shell.
341 char sigmode[NSIG - 1];
342 #define S_DFL 1 /* default signal handling (SIG_DFL) */
343 #define S_CATCH 2 /* signal is caught */
344 #define S_IGN 3 /* signal is ignored (SIG_IGN) */
345 #define S_HARD_IGN 4 /* signal is ignored permanently */
347 /* indicates specified signal received */
348 uint8_t gotsig[NSIG - 1]; /* offset by 1: "signal" 0 is meaningless */
349 uint8_t may_have_traps; /* 0: definitely no traps are set, 1: some traps may be set */
351 char **trap_ptr; /* used only by "trap hack" */
353 /* Rarely referenced stuff */
354 #if ENABLE_ASH_RANDOM_SUPPORT
357 pid_t backgndpid; /* pid of last background process */
359 extern struct globals_misc *const ash_ptr_to_globals_misc;
360 #define G_misc (*ash_ptr_to_globals_misc)
361 #define exitstatus (G_misc.exitstatus )
362 #define back_exitstatus (G_misc.back_exitstatus )
363 #define job_warning (G_misc.job_warning)
364 #define rootpid (G_misc.rootpid )
365 #define shlvl (G_misc.shlvl )
366 #define minusc (G_misc.minusc )
367 #define curdir (G_misc.curdir )
368 #define physdir (G_misc.physdir )
369 #define arg0 (G_misc.arg0 )
370 #define exception_handler (G_misc.exception_handler)
371 #define exception_type (G_misc.exception_type )
372 #define suppress_int (G_misc.suppress_int )
373 #define pending_int (G_misc.pending_int )
374 #define pending_sig (G_misc.pending_sig )
375 #define isloginsh (G_misc.isloginsh )
376 #define nullstr (G_misc.nullstr )
377 #define optlist (G_misc.optlist )
378 #define sigmode (G_misc.sigmode )
379 #define gotsig (G_misc.gotsig )
380 #define may_have_traps (G_misc.may_have_traps )
381 #define trap (G_misc.trap )
382 #define trap_ptr (G_misc.trap_ptr )
383 #define random_gen (G_misc.random_gen )
384 #define backgndpid (G_misc.backgndpid )
385 #define INIT_G_misc() do { \
386 (*(struct globals_misc**)&ash_ptr_to_globals_misc) = xzalloc(sizeof(G_misc)); \
394 /* ============ DEBUG */
396 static void trace_printf(const char *fmt, ...);
397 static void trace_vprintf(const char *fmt, va_list va);
398 # define TRACE(param) trace_printf param
399 # define TRACEV(param) trace_vprintf param
400 # define close(fd) do { \
402 if (close(dfd) < 0) \
403 bb_error_msg("bug on %d: closing %d(0x%x)", \
404 __LINE__, dfd, dfd); \
407 # define TRACE(param)
408 # define TRACEV(param)
412 /* ============ Utility functions */
413 #define is_name(c) ((c) == '_' || isalpha((unsigned char)(c)))
414 #define is_in_name(c) ((c) == '_' || isalnum((unsigned char)(c)))
417 isdigit_str9(const char *str)
419 int maxlen = 9 + 1; /* max 9 digits: 999999999 */
420 while (--maxlen && isdigit(*str))
422 return (*str == '\0');
426 var_end(const char *var)
435 /* ============ Interrupts / exceptions */
437 static void exitshell(void) NORETURN;
440 * These macros allow the user to suspend the handling of interrupt signals
441 * over a period of time. This is similar to SIGHOLD or to sigblock, but
442 * much more efficient and portable. (But hacking the kernel is so much
443 * more fun than worrying about efficiency and portability. :-))
445 #define INT_OFF do { \
451 * Called to raise an exception. Since C doesn't include exceptions, we
452 * just do a longjmp to the exception handler. The type of exception is
453 * stored in the global variable "exception_type".
455 static void raise_exception(int) NORETURN;
457 raise_exception(int e)
460 if (exception_handler == NULL)
465 longjmp(exception_handler->loc, 1);
468 #define raise_exception(e) do { \
469 TRACE(("raising exception %d on line %d\n", (e), __LINE__)); \
470 raise_exception(e); \
475 * Called when a SIGINT is received. (If the user specifies
476 * that SIGINT is to be trapped or ignored using the trap builtin, then
477 * this routine is not called.) Suppressint is nonzero when interrupts
478 * are held using the INT_OFF macro. (The test for iflag is just
479 * defensive programming.)
481 static void raise_interrupt(void) NORETURN;
483 raise_interrupt(void)
488 /* Signal is not automatically unmasked after it is raised,
489 * do it ourself - unmask all signals */
490 sigprocmask_allsigs(SIG_UNBLOCK);
491 /* pending_sig = 0; - now done in signal_handler() */
494 if (gotsig[SIGINT - 1] && !trap[SIGINT]) {
495 if (!(rootshell && iflag)) {
496 /* Kill ourself with SIGINT */
497 signal(SIGINT, SIG_DFL);
502 /* bash: ^C even on empty command line sets $? */
503 exitstatus = SIGINT + 128;
504 raise_exception(ex_type);
508 #define raise_interrupt() do { \
509 TRACE(("raising interrupt on line %d\n", __LINE__)); \
514 static IF_ASH_OPTIMIZE_FOR_SIZE(inline) void
518 if (--suppress_int == 0 && pending_int) {
522 #define INT_ON int_on()
523 static IF_ASH_OPTIMIZE_FOR_SIZE(inline) void
531 #define FORCE_INT_ON force_int_on()
533 #define SAVE_INT(v) ((v) = suppress_int)
535 #define RESTORE_INT(v) do { \
537 suppress_int = (v); \
538 if (suppress_int == 0 && pending_int) \
543 /* ============ Stdout/stderr output */
546 outstr(const char *p, FILE *file)
554 flush_stdout_stderr(void)
561 /* Was called outcslow(c,FILE*), but c was always '\n' */
563 newline_and_flush(FILE *dest)
571 static int out1fmt(const char *, ...) __attribute__((__format__(__printf__,1,2)));
573 out1fmt(const char *fmt, ...)
580 r = vprintf(fmt, ap);
586 static int fmtstr(char *, size_t, const char *, ...) __attribute__((__format__(__printf__,3,4)));
588 fmtstr(char *outbuf, size_t length, const char *fmt, ...)
595 ret = vsnprintf(outbuf, length, fmt, ap);
602 out1str(const char *p)
608 out2str(const char *p)
611 flush_stdout_stderr();
615 /* ============ Parser structures */
617 /* control characters in argument strings */
618 #define CTL_FIRST CTLESC
619 #define CTLESC ((unsigned char)'\201') /* escape next character */
620 #define CTLVAR ((unsigned char)'\202') /* variable defn */
621 #define CTLENDVAR ((unsigned char)'\203')
622 #define CTLBACKQ ((unsigned char)'\204')
623 #define CTLARI ((unsigned char)'\206') /* arithmetic expression */
624 #define CTLENDARI ((unsigned char)'\207')
625 #define CTLQUOTEMARK ((unsigned char)'\210')
626 #define CTL_LAST CTLQUOTEMARK
628 /* variable substitution byte (follows CTLVAR) */
629 #define VSTYPE 0x0f /* type of variable substitution */
630 #define VSNUL 0x10 /* colon--treat the empty string as unset */
632 /* values of VSTYPE field */
633 #define VSNORMAL 0x1 /* normal variable: $var or ${var} */
634 #define VSMINUS 0x2 /* ${var-text} */
635 #define VSPLUS 0x3 /* ${var+text} */
636 #define VSQUESTION 0x4 /* ${var?message} */
637 #define VSASSIGN 0x5 /* ${var=text} */
638 #define VSTRIMRIGHT 0x6 /* ${var%pattern} */
639 #define VSTRIMRIGHTMAX 0x7 /* ${var%%pattern} */
640 #define VSTRIMLEFT 0x8 /* ${var#pattern} */
641 #define VSTRIMLEFTMAX 0x9 /* ${var##pattern} */
642 #define VSLENGTH 0xa /* ${#var} */
643 #if ENABLE_ASH_BASH_COMPAT
644 #define VSSUBSTR 0xc /* ${var:position:length} */
645 #define VSREPLACE 0xd /* ${var/pattern/replacement} */
646 #define VSREPLACEALL 0xe /* ${var//pattern/replacement} */
649 static const char dolatstr[] ALIGN1 = {
650 CTLQUOTEMARK, CTLVAR, VSNORMAL, '@', '=', CTLQUOTEMARK, '\0'
652 #define DOLATSTRLEN 6
671 #if ENABLE_ASH_BASH_COMPAT
688 smallint type; /* Nxxxx */
691 union node *redirect;
696 smallint pipe_backgnd;
697 struct nodelist *cmdlist;
703 union node *redirect;
716 union node *elsepart;
743 struct nodelist *backquote;
746 /* nfile and ndup layout must match!
747 * NTOFD (>&fdnum) uses ndup structure, but we may discover mid-flight
748 * that it is actually NTO2 (>&file), and change its type.
765 char *_unused_expfname;
784 struct nredir nredir;
785 struct nbinary nbinary;
789 struct nclist nclist;
798 * NODE_EOF is returned by parsecmd when it encounters an end of file.
799 * It must be distinct from NULL.
801 #define NODE_EOF ((union node *) -1L)
804 struct nodelist *next;
817 freefunc(struct funcnode *f)
819 if (f && --f->count < 0)
824 /* ============ Debugging output */
828 static FILE *tracefile;
831 trace_printf(const char *fmt, ...)
838 fprintf(tracefile, "%u ", (int) time(NULL));
840 fprintf(tracefile, "[%u] ", (int) getpid());
842 fprintf(tracefile, "pending s:%d i:%d(supp:%d) ", pending_sig, pending_int, suppress_int);
844 vfprintf(tracefile, fmt, va);
849 trace_vprintf(const char *fmt, va_list va)
854 fprintf(tracefile, "%u ", (int) time(NULL));
856 fprintf(tracefile, "[%u] ", (int) getpid());
858 fprintf(tracefile, "pending s:%d i:%d(supp:%d) ", pending_sig, pending_int, suppress_int);
859 vfprintf(tracefile, fmt, va);
863 trace_puts(const char *s)
871 trace_puts_quoted(char *s)
878 putc('"', tracefile);
879 for (p = s; *p; p++) {
880 switch ((unsigned char)*p) {
881 case '\n': c = 'n'; goto backslash;
882 case '\t': c = 't'; goto backslash;
883 case '\r': c = 'r'; goto backslash;
884 case '\"': c = '\"'; goto backslash;
885 case '\\': c = '\\'; goto backslash;
886 case CTLESC: c = 'e'; goto backslash;
887 case CTLVAR: c = 'v'; goto backslash;
888 case CTLBACKQ: c = 'q'; goto backslash;
890 putc('\\', tracefile);
894 if (*p >= ' ' && *p <= '~')
897 putc('\\', tracefile);
898 putc((*p >> 6) & 03, tracefile);
899 putc((*p >> 3) & 07, tracefile);
900 putc(*p & 07, tracefile);
905 putc('"', tracefile);
909 trace_puts_args(char **ap)
916 trace_puts_quoted(*ap);
918 putc('\n', tracefile);
921 putc(' ', tracefile);
936 /* leave open because libedit might be using it */
939 strcpy(s, "./trace");
941 if (!freopen(s, "a", tracefile)) {
942 fprintf(stderr, "Can't re-open %s\n", s);
947 tracefile = fopen(s, "a");
948 if (tracefile == NULL) {
949 fprintf(stderr, "Can't open %s\n", s);
955 flags = fcntl(fileno(tracefile), F_GETFL);
957 fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND);
959 setlinebuf(tracefile);
960 fputs("\nTracing started.\n", tracefile);
964 indent(int amount, char *pfx, FILE *fp)
968 for (i = 0; i < amount; i++) {
969 if (pfx && i == amount - 1)
975 /* little circular references here... */
976 static void shtree(union node *n, int ind, char *pfx, FILE *fp);
979 sharg(union node *arg, FILE *fp)
982 struct nodelist *bqlist;
983 unsigned char subtype;
985 if (arg->type != NARG) {
986 out1fmt("<node type %d>\n", arg->type);
989 bqlist = arg->narg.backquote;
990 for (p = arg->narg.text; *p; p++) {
991 switch ((unsigned char)*p) {
1000 if (subtype == VSLENGTH)
1008 if (subtype & VSNUL)
1011 switch (subtype & VSTYPE) {
1037 case VSTRIMRIGHTMAX:
1044 out1fmt("<subtype %d>", subtype);
1053 shtree(bqlist->n, -1, NULL, fp);
1064 shcmd(union node *cmd, FILE *fp)
1072 for (np = cmd->ncmd.args; np; np = np->narg.next) {
1078 for (np = cmd->ncmd.redirect; np; np = np->nfile.next) {
1082 switch (np->nfile.type) {
1083 case NTO: s = ">>"+1; dftfd = 1; break;
1084 case NCLOBBER: s = ">|"; dftfd = 1; break;
1085 case NAPPEND: s = ">>"; dftfd = 1; break;
1086 #if ENABLE_ASH_BASH_COMPAT
1089 case NTOFD: s = ">&"; dftfd = 1; break;
1090 case NFROM: s = "<"; break;
1091 case NFROMFD: s = "<&"; break;
1092 case NFROMTO: s = "<>"; break;
1093 default: s = "*error*"; break;
1095 if (np->nfile.fd != dftfd)
1096 fprintf(fp, "%d", np->nfile.fd);
1098 if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) {
1099 fprintf(fp, "%d", np->ndup.dupfd);
1101 sharg(np->nfile.fname, fp);
1108 shtree(union node *n, int ind, char *pfx, FILE *fp)
1110 struct nodelist *lp;
1116 indent(ind, pfx, fp);
1118 if (n == NODE_EOF) {
1133 shtree(n->nbinary.ch1, ind, NULL, fp);
1136 shtree(n->nbinary.ch2, ind, NULL, fp);
1144 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
1145 shtree(lp->n, 0, NULL, fp);
1149 if (n->npipe.pipe_backgnd)
1155 fprintf(fp, "<node type %d>", n->type);
1163 showtree(union node *n)
1165 trace_puts("showtree called\n");
1166 shtree(n, 1, NULL, stderr);
1172 /* ============ Parser data */
1175 * ash_vmsg() needs parsefile->fd, hence parsefile definition is moved up.
1178 struct strlist *next;
1185 struct strpush *prev; /* preceding string on stack */
1187 int prev_left_in_line;
1188 #if ENABLE_ASH_ALIAS
1189 struct alias *ap; /* if push was associated with an alias */
1191 char *string; /* remember the string since it may change */
1193 /* Remember last two characters for pungetc. */
1196 /* Number of outstanding calls to pungetc. */
1201 struct parsefile *prev; /* preceding file on stack */
1202 int linno; /* current line */
1203 int pf_fd; /* file descriptor (or -1 if string) */
1204 int left_in_line; /* number of chars left in this line */
1205 int left_in_buffer; /* number of chars left in this buffer past the line */
1206 char *next_to_pgetc; /* next char in buffer */
1207 char *buf; /* input buffer */
1208 struct strpush *strpush; /* for pushing strings at this level */
1209 struct strpush basestrpush; /* so pushing one is fast */
1211 /* Remember last two characters for pungetc. */
1214 /* Number of outstanding calls to pungetc. */
1218 static struct parsefile basepf; /* top level input file */
1219 static struct parsefile *g_parsefile = &basepf; /* current input file */
1220 static int startlinno; /* line # where last token started */
1221 static char *commandname; /* currently executing command */
1222 static struct strlist *cmdenviron; /* environment for builtin command */
1225 /* ============ Message printing */
1228 ash_vmsg(const char *msg, va_list ap)
1230 fprintf(stderr, "%s: ", arg0);
1232 if (strcmp(arg0, commandname))
1233 fprintf(stderr, "%s: ", commandname);
1234 if (!iflag || g_parsefile->pf_fd > 0)
1235 fprintf(stderr, "line %d: ", startlinno);
1237 vfprintf(stderr, msg, ap);
1238 newline_and_flush(stderr);
1242 * Exverror is called to raise the error exception. If the second argument
1243 * is not NULL then error prints an error message using printf style
1244 * formatting. It then raises the error exception.
1246 static void ash_vmsg_and_raise(int, const char *, va_list) NORETURN;
1248 ash_vmsg_and_raise(int cond, const char *msg, va_list ap)
1252 TRACE(("ash_vmsg_and_raise(%d, \"", cond));
1254 TRACE(("\") pid=%d\n", getpid()));
1256 TRACE(("ash_vmsg_and_raise(%d, NULL) pid=%d\n", cond, getpid()));
1261 flush_stdout_stderr();
1262 raise_exception(cond);
1266 static void ash_msg_and_raise_error(const char *, ...) NORETURN;
1268 ash_msg_and_raise_error(const char *msg, ...)
1273 ash_vmsg_and_raise(EXERROR, msg, ap);
1278 static void raise_error_syntax(const char *) NORETURN;
1280 raise_error_syntax(const char *msg)
1282 ash_msg_and_raise_error("syntax error: %s", msg);
1286 static void ash_msg_and_raise(int, const char *, ...) NORETURN;
1288 ash_msg_and_raise(int cond, const char *msg, ...)
1293 ash_vmsg_and_raise(cond, msg, ap);
1299 * error/warning routines for external builtins
1302 ash_msg(const char *fmt, ...)
1312 * Return a string describing an error. The returned string may be a
1313 * pointer to a static buffer that will be overwritten on the next call.
1314 * Action describes the operation that got the error.
1317 errmsg(int e, const char *em)
1319 if (e == ENOENT || e == ENOTDIR) {
1326 /* ============ Memory allocation */
1329 /* I consider these wrappers nearly useless:
1330 * ok, they return you to nearest exception handler, but
1331 * how much memory do you leak in the process, making
1332 * memory starvation worse?
1335 ckrealloc(void * p, size_t nbytes)
1337 p = realloc(p, nbytes);
1339 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1344 ckmalloc(size_t nbytes)
1346 return ckrealloc(NULL, nbytes);
1350 ckzalloc(size_t nbytes)
1352 return memset(ckmalloc(nbytes), 0, nbytes);
1356 ckstrdup(const char *s)
1358 char *p = strdup(s);
1360 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1364 /* Using bbox equivalents. They exit if out of memory */
1365 # define ckrealloc xrealloc
1366 # define ckmalloc xmalloc
1367 # define ckzalloc xzalloc
1368 # define ckstrdup xstrdup
1372 * It appears that grabstackstr() will barf with such alignments
1373 * because stalloc() will return a string allocated in a new stackblock.
1375 #define SHELL_ALIGN(nbytes) (((nbytes) + SHELL_SIZE) & ~SHELL_SIZE)
1377 /* Most machines require the value returned from malloc to be aligned
1378 * in some way. The following macro will get this right
1379 * on many machines. */
1380 SHELL_SIZE = sizeof(union { int i; char *cp; double d; }) - 1,
1381 /* Minimum size of a block */
1382 MINSIZE = SHELL_ALIGN(504),
1385 struct stack_block {
1386 struct stack_block *prev;
1387 char space[MINSIZE];
1391 struct stack_block *stackp;
1397 struct globals_memstack {
1398 struct stack_block *g_stackp; // = &stackbase;
1399 char *g_stacknxt; // = stackbase.space;
1400 char *sstrend; // = stackbase.space + MINSIZE;
1401 size_t g_stacknleft; // = MINSIZE;
1402 struct stack_block stackbase;
1404 extern struct globals_memstack *const ash_ptr_to_globals_memstack;
1405 #define G_memstack (*ash_ptr_to_globals_memstack)
1406 #define g_stackp (G_memstack.g_stackp )
1407 #define g_stacknxt (G_memstack.g_stacknxt )
1408 #define sstrend (G_memstack.sstrend )
1409 #define g_stacknleft (G_memstack.g_stacknleft)
1410 #define stackbase (G_memstack.stackbase )
1411 #define INIT_G_memstack() do { \
1412 (*(struct globals_memstack**)&ash_ptr_to_globals_memstack) = xzalloc(sizeof(G_memstack)); \
1414 g_stackp = &stackbase; \
1415 g_stacknxt = stackbase.space; \
1416 g_stacknleft = MINSIZE; \
1417 sstrend = stackbase.space + MINSIZE; \
1421 #define stackblock() ((void *)g_stacknxt)
1422 #define stackblocksize() g_stacknleft
1425 * Parse trees for commands are allocated in lifo order, so we use a stack
1426 * to make this more efficient, and also to avoid all sorts of exception
1427 * handling code to handle interrupts in the middle of a parse.
1429 * The size 504 was chosen because the Ultrix malloc handles that size
1433 stalloc(size_t nbytes)
1438 aligned = SHELL_ALIGN(nbytes);
1439 if (aligned > g_stacknleft) {
1442 struct stack_block *sp;
1444 blocksize = aligned;
1445 if (blocksize < MINSIZE)
1446 blocksize = MINSIZE;
1447 len = sizeof(struct stack_block) - MINSIZE + blocksize;
1448 if (len < blocksize)
1449 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1452 sp->prev = g_stackp;
1453 g_stacknxt = sp->space;
1454 g_stacknleft = blocksize;
1455 sstrend = g_stacknxt + blocksize;
1460 g_stacknxt += aligned;
1461 g_stacknleft -= aligned;
1466 stzalloc(size_t nbytes)
1468 return memset(stalloc(nbytes), 0, nbytes);
1475 if (!p || (g_stacknxt < (char *)p) || ((char *)p < g_stackp->space)) {
1476 write(STDERR_FILENO, "stunalloc\n", 10);
1480 g_stacknleft += g_stacknxt - (char *)p;
1485 * Like strdup but works with the ash stack.
1488 sstrdup(const char *p)
1490 size_t len = strlen(p) + 1;
1491 return memcpy(stalloc(len), p, len);
1495 grabstackblock(size_t len)
1497 len = SHELL_ALIGN(len);
1499 g_stacknleft -= len;
1503 pushstackmark(struct stackmark *mark, size_t len)
1505 mark->stackp = g_stackp;
1506 mark->stacknxt = g_stacknxt;
1507 mark->stacknleft = g_stacknleft;
1508 grabstackblock(len);
1512 setstackmark(struct stackmark *mark)
1514 pushstackmark(mark, g_stacknxt == g_stackp->space && g_stackp != &stackbase);
1518 popstackmark(struct stackmark *mark)
1520 struct stack_block *sp;
1526 while (g_stackp != mark->stackp) {
1528 g_stackp = sp->prev;
1531 g_stacknxt = mark->stacknxt;
1532 g_stacknleft = mark->stacknleft;
1533 sstrend = mark->stacknxt + mark->stacknleft;
1538 * When the parser reads in a string, it wants to stick the string on the
1539 * stack and only adjust the stack pointer when it knows how big the
1540 * string is. Stackblock (defined in stack.h) returns a pointer to a block
1541 * of space on top of the stack and stackblocklen returns the length of
1542 * this block. Growstackblock will grow this space by at least one byte,
1543 * possibly moving it (like realloc). Grabstackblock actually allocates the
1544 * part of the block that has been used.
1547 growstackblock(void)
1551 newlen = g_stacknleft * 2;
1552 if (newlen < g_stacknleft)
1553 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1557 if (g_stacknxt == g_stackp->space && g_stackp != &stackbase) {
1558 struct stack_block *sp;
1559 struct stack_block *prevstackp;
1564 prevstackp = sp->prev;
1565 grosslen = newlen + sizeof(struct stack_block) - MINSIZE;
1566 sp = ckrealloc(sp, grosslen);
1567 sp->prev = prevstackp;
1569 g_stacknxt = sp->space;
1570 g_stacknleft = newlen;
1571 sstrend = sp->space + newlen;
1574 char *oldspace = g_stacknxt;
1575 size_t oldlen = g_stacknleft;
1576 char *p = stalloc(newlen);
1578 /* free the space we just allocated */
1579 g_stacknxt = memcpy(p, oldspace, oldlen);
1580 g_stacknleft += newlen;
1585 * The following routines are somewhat easier to use than the above.
1586 * The user declares a variable of type STACKSTR, which may be declared
1587 * to be a register. The macro STARTSTACKSTR initializes things. Then
1588 * the user uses the macro STPUTC to add characters to the string. In
1589 * effect, STPUTC(c, p) is the same as *p++ = c except that the stack is
1590 * grown as necessary. When the user is done, she can just leave the
1591 * string there and refer to it using stackblock(). Or she can allocate
1592 * the space for it using grabstackstr(). If it is necessary to allow
1593 * someone else to use the stack temporarily and then continue to grow
1594 * the string, the user should use grabstack to allocate the space, and
1595 * then call ungrabstr(p) to return to the previous mode of operation.
1597 * USTPUTC is like STPUTC except that it doesn't check for overflow.
1598 * CHECKSTACKSPACE can be called before USTPUTC to ensure that there
1599 * is space for at least one character.
1604 size_t len = stackblocksize();
1606 return (char *)stackblock() + len;
1610 * Called from CHECKSTRSPACE.
1613 makestrspace(size_t newlen, char *p)
1615 size_t len = p - g_stacknxt;
1621 size = stackblocksize();
1623 if (nleft >= newlen)
1627 return (char *)stackblock() + len;
1631 stack_nputstr(const char *s, size_t n, char *p)
1633 p = makestrspace(n, p);
1634 p = (char *)memcpy(p, s, n) + n;
1639 stack_putstr(const char *s, char *p)
1641 return stack_nputstr(s, strlen(s), p);
1645 _STPUTC(int c, char *p)
1653 #define STARTSTACKSTR(p) ((p) = stackblock())
1654 #define STPUTC(c, p) ((p) = _STPUTC((c), (p)))
1655 #define CHECKSTRSPACE(n, p) do { \
1658 size_t m = sstrend - q; \
1660 (p) = makestrspace(l, q); \
1662 #define USTPUTC(c, p) (*(p)++ = (c))
1663 #define STACKSTRNUL(p) do { \
1664 if ((p) == sstrend) \
1665 (p) = growstackstr(); \
1668 #define STUNPUTC(p) (--(p))
1669 #define STTOPC(p) ((p)[-1])
1670 #define STADJUST(amount, p) ((p) += (amount))
1672 #define grabstackstr(p) stalloc((char *)(p) - (char *)stackblock())
1673 #define ungrabstackstr(s, p) stunalloc(s)
1674 #define stackstrend() ((void *)sstrend)
1677 /* ============ String helpers */
1680 * prefix -- see if pfx is a prefix of string.
1683 prefix(const char *string, const char *pfx)
1686 if (*pfx++ != *string++)
1689 return (char *) string;
1693 * Check for a valid number. This should be elsewhere.
1696 is_number(const char *p)
1701 } while (*++p != '\0');
1706 * Convert a string of digits to an integer, printing an error message on
1710 number(const char *s)
1713 ash_msg_and_raise_error(msg_illnum, s);
1718 * Produce a possibly single quoted string suitable as input to the shell.
1719 * The return string is allocated on the stack.
1722 single_quote(const char *s)
1732 len = strchrnul(s, '\'') - s;
1734 q = p = makestrspace(len + 3, p);
1737 q = (char *)memcpy(q, s, len) + len;
1746 do len++; while (*++s == '\'');
1748 q = p = makestrspace(len + 3, p);
1751 q = (char *)memcpy(q, s - len, len) + len;
1759 return stackblock();
1763 /* ============ nextopt */
1765 static char **argptr; /* argument list for builtin commands */
1766 static char *optionarg; /* set by nextopt (like getopt) */
1767 static char *optptr; /* used by nextopt */
1770 * XXX - should get rid of. Have all builtins use getopt(3).
1771 * The library getopt must have the BSD extension static variable
1772 * "optreset", otherwise it can't be used within the shell safely.
1774 * Standard option processing (a la getopt) for builtin routines.
1775 * The only argument that is passed to nextopt is the option string;
1776 * the other arguments are unnecessary. It returns the character,
1777 * or '\0' on end of input.
1780 nextopt(const char *optstring)
1787 if (p == NULL || *p == '\0') {
1788 /* We ate entire "-param", take next one */
1794 if (*++p == '\0') /* just "-" ? */
1797 if (LONE_DASH(p)) /* "--" ? */
1799 /* p => next "-param" */
1801 /* p => some option char in the middle of a "-param" */
1803 for (q = optstring; *q != c;) {
1805 ash_msg_and_raise_error("illegal option -%c", c);
1813 ash_msg_and_raise_error("no arg for -%c option", c);
1823 /* ============ Shell variables */
1826 * The parsefile structure pointed to by the global variable parsefile
1827 * contains information about the current file being read.
1830 int nparam; /* # of positional parameters (without $0) */
1831 #if ENABLE_ASH_GETOPTS
1832 int optind; /* next parameter to be processed by getopts */
1833 int optoff; /* used by getopts */
1835 unsigned char malloced; /* if parameter list dynamically allocated */
1836 char **p; /* parameter list */
1840 * Free the list of positional parameters.
1843 freeparam(volatile struct shparam *param)
1845 if (param->malloced) {
1847 ap = ap1 = param->p;
1854 #if ENABLE_ASH_GETOPTS
1855 static void FAST_FUNC getoptsreset(const char *value);
1859 struct var *next; /* next entry in hash list */
1860 int flags; /* flags are defined above */
1861 const char *var_text; /* name=value */
1862 void (*var_func)(const char *) FAST_FUNC; /* function to be called when */
1863 /* the variable gets set/unset */
1867 struct localvar *next; /* next local variable in list */
1868 struct var *vp; /* the variable that was made local */
1869 int flags; /* saved flags */
1870 const char *text; /* saved text */
1874 #define VEXPORT 0x01 /* variable is exported */
1875 #define VREADONLY 0x02 /* variable cannot be modified */
1876 #define VSTRFIXED 0x04 /* variable struct is statically allocated */
1877 #define VTEXTFIXED 0x08 /* text is statically allocated */
1878 #define VSTACK 0x10 /* text is allocated on the stack */
1879 #define VUNSET 0x20 /* the variable is not set */
1880 #define VNOFUNC 0x40 /* don't call the callback function */
1881 #define VNOSET 0x80 /* do not set variable - just readonly test */
1882 #define VNOSAVE 0x100 /* when text is on the heap before setvareq */
1883 #if ENABLE_ASH_RANDOM_SUPPORT
1884 # define VDYNAMIC 0x200 /* dynamic variable */
1890 /* Need to be before varinit_data[] */
1891 #if ENABLE_LOCALE_SUPPORT
1892 static void FAST_FUNC
1893 change_lc_all(const char *value)
1895 if (value && *value != '\0')
1896 setlocale(LC_ALL, value);
1898 static void FAST_FUNC
1899 change_lc_ctype(const char *value)
1901 if (value && *value != '\0')
1902 setlocale(LC_CTYPE, value);
1906 static void chkmail(void);
1907 static void changemail(const char *var_value) FAST_FUNC;
1909 # define chkmail() ((void)0)
1911 static void changepath(const char *) FAST_FUNC;
1912 #if ENABLE_ASH_RANDOM_SUPPORT
1913 static void change_random(const char *) FAST_FUNC;
1916 static const struct {
1918 const char *var_text;
1919 void (*var_func)(const char *) FAST_FUNC;
1920 } varinit_data[] = {
1922 * Note: VEXPORT would not work correctly here for NOFORK applets:
1923 * some environment strings may be constant.
1925 { VSTRFIXED|VTEXTFIXED , defifsvar , NULL },
1927 { VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL" , changemail },
1928 { VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH" , changemail },
1930 { VSTRFIXED|VTEXTFIXED , bb_PATH_root_path, changepath },
1931 { VSTRFIXED|VTEXTFIXED , "PS1=$ " , NULL },
1932 { VSTRFIXED|VTEXTFIXED , "PS2=> " , NULL },
1933 { VSTRFIXED|VTEXTFIXED , "PS4=+ " , NULL },
1934 #if ENABLE_ASH_GETOPTS
1935 { VSTRFIXED|VTEXTFIXED , defoptindvar, getoptsreset },
1937 #if ENABLE_ASH_RANDOM_SUPPORT
1938 { VSTRFIXED|VTEXTFIXED|VUNSET|VDYNAMIC, "RANDOM", change_random },
1940 #if ENABLE_LOCALE_SUPPORT
1941 { VSTRFIXED|VTEXTFIXED|VUNSET, "LC_ALL" , change_lc_all },
1942 { VSTRFIXED|VTEXTFIXED|VUNSET, "LC_CTYPE" , change_lc_ctype },
1944 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
1945 { VSTRFIXED|VTEXTFIXED|VUNSET, "HISTFILE" , NULL },
1951 struct globals_var {
1952 struct shparam shellparam; /* $@ current positional parameters */
1953 struct redirtab *redirlist;
1954 int preverrout_fd; /* save fd2 before print debug if xflag is set. */
1955 struct var *vartab[VTABSIZE];
1956 struct var varinit[ARRAY_SIZE(varinit_data)];
1958 extern struct globals_var *const ash_ptr_to_globals_var;
1959 #define G_var (*ash_ptr_to_globals_var)
1960 #define shellparam (G_var.shellparam )
1961 //#define redirlist (G_var.redirlist )
1962 #define preverrout_fd (G_var.preverrout_fd)
1963 #define vartab (G_var.vartab )
1964 #define varinit (G_var.varinit )
1965 #define INIT_G_var() do { \
1967 (*(struct globals_var**)&ash_ptr_to_globals_var) = xzalloc(sizeof(G_var)); \
1969 for (i = 0; i < ARRAY_SIZE(varinit_data); i++) { \
1970 varinit[i].flags = varinit_data[i].flags; \
1971 varinit[i].var_text = varinit_data[i].var_text; \
1972 varinit[i].var_func = varinit_data[i].var_func; \
1976 #define vifs varinit[0]
1978 # define vmail (&vifs)[1]
1979 # define vmpath (&vmail)[1]
1980 # define vpath (&vmpath)[1]
1982 # define vpath (&vifs)[1]
1984 #define vps1 (&vpath)[1]
1985 #define vps2 (&vps1)[1]
1986 #define vps4 (&vps2)[1]
1987 #if ENABLE_ASH_GETOPTS
1988 # define voptind (&vps4)[1]
1989 # if ENABLE_ASH_RANDOM_SUPPORT
1990 # define vrandom (&voptind)[1]
1993 # if ENABLE_ASH_RANDOM_SUPPORT
1994 # define vrandom (&vps4)[1]
1999 * The following macros access the values of the above variables.
2000 * They have to skip over the name. They return the null string
2001 * for unset variables.
2003 #define ifsval() (vifs.var_text + 4)
2004 #define ifsset() ((vifs.flags & VUNSET) == 0)
2006 # define mailval() (vmail.var_text + 5)
2007 # define mpathval() (vmpath.var_text + 9)
2008 # define mpathset() ((vmpath.flags & VUNSET) == 0)
2010 #define pathval() (vpath.var_text + 5)
2011 #define ps1val() (vps1.var_text + 4)
2012 #define ps2val() (vps2.var_text + 4)
2013 #define ps4val() (vps4.var_text + 4)
2014 #if ENABLE_ASH_GETOPTS
2015 # define optindval() (voptind.var_text + 7)
2018 #if ENABLE_ASH_GETOPTS
2019 static void FAST_FUNC
2020 getoptsreset(const char *value)
2022 shellparam.optind = number(value) ?: 1;
2023 shellparam.optoff = -1;
2028 * Compares two strings up to the first = or '\0'. The first
2029 * string must be terminated by '='; the second may be terminated by
2030 * either '=' or '\0'.
2033 varcmp(const char *p, const char *q)
2037 while ((c = *p) == (d = *q)) {
2038 if (c == '\0' || c == '=')
2052 * Find the appropriate entry in the hash table from the name.
2054 static struct var **
2055 hashvar(const char *p)
2059 hashval = ((unsigned char) *p) << 4;
2060 while (*p && *p != '=')
2061 hashval += (unsigned char) *p++;
2062 return &vartab[hashval % VTABSIZE];
2066 vpcmp(const void *a, const void *b)
2068 return varcmp(*(const char **)a, *(const char **)b);
2072 * This routine initializes the builtin variables.
2082 * PS1 depends on uid
2084 #if ENABLE_FEATURE_EDITING && ENABLE_FEATURE_EDITING_FANCY_PROMPT
2085 vps1.var_text = "PS1=\\w \\$ ";
2088 vps1.var_text = "PS1=# ";
2091 end = vp + ARRAY_SIZE(varinit);
2093 vpp = hashvar(vp->var_text);
2096 } while (++vp < end);
2099 static struct var **
2100 findvar(struct var **vpp, const char *name)
2102 for (; *vpp; vpp = &(*vpp)->next) {
2103 if (varcmp((*vpp)->var_text, name) == 0) {
2111 * Find the value of a variable. Returns NULL if not set.
2113 static const char* FAST_FUNC
2114 lookupvar(const char *name)
2118 v = *findvar(hashvar(name), name);
2120 #if ENABLE_ASH_RANDOM_SUPPORT
2122 * Dynamic variables are implemented roughly the same way they are
2123 * in bash. Namely, they're "special" so long as they aren't unset.
2124 * As soon as they're unset, they're no longer dynamic, and dynamic
2125 * lookup will no longer happen at that point. -- PFM.
2127 if (v->flags & VDYNAMIC)
2130 if (!(v->flags & VUNSET))
2131 return var_end(v->var_text);
2137 reinit_unicode_for_ash(void)
2139 /* Unicode support should be activated even if LANG is set
2140 * _during_ shell execution, not only if it was set when
2141 * shell was started. Therefore, re-check LANG every time:
2143 if (ENABLE_FEATURE_CHECK_UNICODE_IN_ENV
2144 || ENABLE_UNICODE_USING_LOCALE
2146 const char *s = lookupvar("LC_ALL");
2147 if (!s) s = lookupvar("LC_CTYPE");
2148 if (!s) s = lookupvar("LANG");
2154 * Search the environment of a builtin command.
2157 bltinlookup(const char *name)
2161 for (sp = cmdenviron; sp; sp = sp->next) {
2162 if (varcmp(sp->text, name) == 0)
2163 return var_end(sp->text);
2165 return lookupvar(name);
2169 * Same as setvar except that the variable and value are passed in
2170 * the first argument as name=value. Since the first argument will
2171 * be actually stored in the table, it should not be a string that
2173 * Called with interrupts off.
2176 setvareq(char *s, int flags)
2178 struct var *vp, **vpp;
2181 flags |= (VEXPORT & (((unsigned) (1 - aflag)) - 1));
2182 vp = *findvar(vpp, s);
2184 if ((vp->flags & (VREADONLY|VDYNAMIC)) == VREADONLY) {
2187 if (flags & VNOSAVE)
2190 ash_msg_and_raise_error("%.*s: is read only", strchrnul(n, '=') - n, n);
2196 if (vp->var_func && !(flags & VNOFUNC))
2197 vp->var_func(var_end(s));
2199 if (!(vp->flags & (VTEXTFIXED|VSTACK)))
2200 free((char*)vp->var_text);
2202 flags |= vp->flags & ~(VTEXTFIXED|VSTACK|VNOSAVE|VUNSET);
2204 /* variable s is not found */
2207 vp = ckzalloc(sizeof(*vp));
2209 /*vp->func = NULL; - ckzalloc did it */
2212 if (!(flags & (VTEXTFIXED|VSTACK|VNOSAVE)))
2219 * Set the value of a variable. The flags argument is ored with the
2220 * flags of the variable. If val is NULL, the variable is unset.
2223 setvar(const char *name, const char *val, int flags)
2231 q = endofname(name);
2232 p = strchrnul(q, '=');
2234 if (!namelen || p != q)
2235 ash_msg_and_raise_error("%.*s: bad variable name", namelen, name);
2240 vallen = strlen(val);
2244 nameeq = ckmalloc(namelen + vallen + 2);
2245 p = memcpy(nameeq, name, namelen) + namelen;
2248 p = memcpy(p, val, vallen) + vallen;
2251 setvareq(nameeq, flags | VNOSAVE);
2255 static void FAST_FUNC
2256 setvar0(const char *name, const char *val)
2258 setvar(name, val, 0);
2262 * Unset the specified variable.
2265 unsetvar(const char *s)
2271 vpp = findvar(hashvar(s), s);
2275 int flags = vp->flags;
2278 if (flags & VREADONLY)
2280 #if ENABLE_ASH_RANDOM_SUPPORT
2281 vp->flags &= ~VDYNAMIC;
2285 if ((flags & VSTRFIXED) == 0) {
2287 if ((flags & (VTEXTFIXED|VSTACK)) == 0)
2288 free((char*)vp->var_text);
2294 vp->flags &= ~VEXPORT;
2304 * Process a linked list of variable assignments.
2307 listsetvar(struct strlist *list_set_var, int flags)
2309 struct strlist *lp = list_set_var;
2315 setvareq(lp->text, flags);
2322 * Generate a list of variables satisfying the given conditions.
2325 listvars(int on, int off, char ***end)
2336 for (vp = *vpp; vp; vp = vp->next) {
2337 if ((vp->flags & mask) == on) {
2338 if (ep == stackstrend())
2339 ep = growstackstr();
2340 *ep++ = (char*)vp->var_text;
2343 } while (++vpp < vartab + VTABSIZE);
2344 if (ep == stackstrend())
2345 ep = growstackstr();
2349 return grabstackstr(ep);
2353 /* ============ Path search helper
2355 * The variable path (passed by reference) should be set to the start
2356 * of the path before the first call; path_advance will update
2357 * this value as it proceeds. Successive calls to path_advance will return
2358 * the possible path expansions in sequence. If an option (indicated by
2359 * a percent sign) appears in the path entry then the global variable
2360 * pathopt will be set to point to it; otherwise pathopt will be set to
2363 static const char *pathopt; /* set by path_advance */
2366 path_advance(const char **path, const char *name)
2376 for (p = start; *p && *p != ':' && *p != '%'; p++)
2378 len = p - start + strlen(name) + 2; /* "2" is for '/' and '\0' */
2379 while (stackblocksize() < len)
2383 memcpy(q, start, p - start);
2391 while (*p && *p != ':')
2398 return stalloc(len);
2402 /* ============ Prompt */
2404 static smallint doprompt; /* if set, prompt the user */
2405 static smallint needprompt; /* true if interactive and at start of line */
2407 #if ENABLE_FEATURE_EDITING
2408 static line_input_t *line_input_state;
2409 static const char *cmdedit_prompt;
2411 putprompt(const char *s)
2413 if (ENABLE_ASH_EXPAND_PRMT) {
2414 free((char*)cmdedit_prompt);
2415 cmdedit_prompt = ckstrdup(s);
2422 putprompt(const char *s)
2428 #if ENABLE_ASH_EXPAND_PRMT
2429 /* expandstr() needs parsing machinery, so it is far away ahead... */
2430 static const char *expandstr(const char *ps);
2432 #define expandstr(s) s
2436 setprompt_if(smallint do_set, int whichprompt)
2439 IF_ASH_EXPAND_PRMT(struct stackmark smark;)
2446 switch (whichprompt) {
2456 #if ENABLE_ASH_EXPAND_PRMT
2457 pushstackmark(&smark, stackblocksize());
2459 putprompt(expandstr(prompt));
2460 #if ENABLE_ASH_EXPAND_PRMT
2461 popstackmark(&smark);
2466 /* ============ The cd and pwd commands */
2468 #define CD_PHYSICAL 1
2478 while ((i = nextopt("LP")) != '\0') {
2480 flags ^= CD_PHYSICAL;
2489 * Update curdir (the name of the current directory) in response to a
2493 updatepwd(const char *dir)
2500 cdcomppath = sstrdup(dir);
2503 if (curdir == nullstr)
2505 new = stack_putstr(curdir, new);
2507 new = makestrspace(strlen(dir) + 2, new);
2508 lim = (char *)stackblock() + 1;
2512 if (new > lim && *lim == '/')
2517 if (dir[1] == '/' && dir[2] != '/') {
2523 p = strtok(cdcomppath, "/");
2527 if (p[1] == '.' && p[2] == '\0') {
2539 new = stack_putstr(p, new);
2542 p = strtok(NULL, "/");
2547 return stackblock();
2551 * Find out what the current directory is. If we already know the current
2552 * directory, this routine returns immediately.
2557 char *dir = getcwd(NULL, 0); /* huh, using glibc extension? */
2558 return dir ? dir : nullstr;
2562 setpwd(const char *val, int setold)
2566 oldcur = dir = curdir;
2569 setvar("OLDPWD", oldcur, VEXPORT);
2572 if (physdir != nullstr) {
2573 if (physdir != oldcur)
2577 if (oldcur == val || !val) {
2583 dir = ckstrdup(val);
2584 if (oldcur != dir && oldcur != nullstr) {
2589 setvar("PWD", dir, VEXPORT);
2592 static void hashcd(void);
2595 * Actually do the chdir. We also call hashcd to let the routines in exec.c
2596 * know that the current directory has changed.
2599 docd(const char *dest, int flags)
2601 const char *dir = NULL;
2604 TRACE(("docd(\"%s\", %d) called\n", dest, flags));
2607 if (!(flags & CD_PHYSICAL)) {
2608 dir = updatepwd(dest);
2622 static int FAST_FUNC
2623 cdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
2635 dest = bltinlookup("HOME");
2636 else if (LONE_DASH(dest)) {
2637 dest = bltinlookup("OLDPWD");
2659 path = bltinlookup("CDPATH");
2668 p = path_advance(&path, dest);
2669 if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
2673 if (!docd(p, flags))
2678 ash_msg_and_raise_error("can't cd to %s", dest);
2681 if (flags & CD_PRINT)
2682 out1fmt("%s\n", curdir);
2686 static int FAST_FUNC
2687 pwdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
2690 const char *dir = curdir;
2694 if (physdir == nullstr)
2698 out1fmt("%s\n", dir);
2703 /* ============ ... */
2706 #define IBUFSIZ (ENABLE_FEATURE_EDITING ? CONFIG_FEATURE_EDITING_MAX_LEN : 1024)
2708 /* Syntax classes */
2709 #define CWORD 0 /* character is nothing special */
2710 #define CNL 1 /* newline character */
2711 #define CBACK 2 /* a backslash character */
2712 #define CSQUOTE 3 /* single quote */
2713 #define CDQUOTE 4 /* double quote */
2714 #define CENDQUOTE 5 /* a terminating quote */
2715 #define CBQUOTE 6 /* backwards single quote */
2716 #define CVAR 7 /* a dollar sign */
2717 #define CENDVAR 8 /* a '}' character */
2718 #define CLP 9 /* a left paren in arithmetic */
2719 #define CRP 10 /* a right paren in arithmetic */
2720 #define CENDFILE 11 /* end of file */
2721 #define CCTL 12 /* like CWORD, except it must be escaped */
2722 #define CSPCL 13 /* these terminate a word */
2723 #define CIGN 14 /* character should be ignored */
2726 #if ENABLE_ASH_ALIAS
2730 #define USE_SIT_FUNCTION ENABLE_ASH_OPTIMIZE_FOR_SIZE
2732 #if ENABLE_SH_MATH_SUPPORT
2733 # define SIT_ITEM(a,b,c,d) (a | (b << 4) | (c << 8) | (d << 12))
2735 # define SIT_ITEM(a,b,c,d) (a | (b << 4) | (c << 8))
2737 static const uint16_t S_I_T[] ALIGN2 = {
2738 #if ENABLE_ASH_ALIAS
2739 SIT_ITEM(CSPCL , CIGN , CIGN , CIGN ), /* 0, PEOA */
2741 SIT_ITEM(CSPCL , CWORD , CWORD, CWORD ), /* 1, ' ' */
2742 SIT_ITEM(CNL , CNL , CNL , CNL ), /* 2, \n */
2743 SIT_ITEM(CWORD , CCTL , CCTL , CWORD ), /* 3, !*-/:=?[]~ */
2744 SIT_ITEM(CDQUOTE , CENDQUOTE, CWORD, CWORD ), /* 4, '"' */
2745 SIT_ITEM(CVAR , CVAR , CWORD, CVAR ), /* 5, $ */
2746 SIT_ITEM(CSQUOTE , CWORD , CENDQUOTE, CWORD), /* 6, "'" */
2747 SIT_ITEM(CSPCL , CWORD , CWORD, CLP ), /* 7, ( */
2748 SIT_ITEM(CSPCL , CWORD , CWORD, CRP ), /* 8, ) */
2749 SIT_ITEM(CBACK , CBACK , CCTL , CBACK ), /* 9, \ */
2750 SIT_ITEM(CBQUOTE , CBQUOTE , CWORD, CBQUOTE), /* 10, ` */
2751 SIT_ITEM(CENDVAR , CENDVAR , CWORD, CENDVAR), /* 11, } */
2752 #if !USE_SIT_FUNCTION
2753 SIT_ITEM(CENDFILE, CENDFILE , CENDFILE, CENDFILE),/* 12, PEOF */
2754 SIT_ITEM(CWORD , CWORD , CWORD, CWORD ), /* 13, 0-9A-Za-z */
2755 SIT_ITEM(CCTL , CCTL , CCTL , CCTL ) /* 14, CTLESC ... */
2759 /* Constants below must match table above */
2761 #if ENABLE_ASH_ALIAS
2762 CSPCL_CIGN_CIGN_CIGN , /* 0 */
2764 CSPCL_CWORD_CWORD_CWORD , /* 1 */
2765 CNL_CNL_CNL_CNL , /* 2 */
2766 CWORD_CCTL_CCTL_CWORD , /* 3 */
2767 CDQUOTE_CENDQUOTE_CWORD_CWORD , /* 4 */
2768 CVAR_CVAR_CWORD_CVAR , /* 5 */
2769 CSQUOTE_CWORD_CENDQUOTE_CWORD , /* 6 */
2770 CSPCL_CWORD_CWORD_CLP , /* 7 */
2771 CSPCL_CWORD_CWORD_CRP , /* 8 */
2772 CBACK_CBACK_CCTL_CBACK , /* 9 */
2773 CBQUOTE_CBQUOTE_CWORD_CBQUOTE , /* 10 */
2774 CENDVAR_CENDVAR_CWORD_CENDVAR , /* 11 */
2775 CENDFILE_CENDFILE_CENDFILE_CENDFILE, /* 12 */
2776 CWORD_CWORD_CWORD_CWORD , /* 13 */
2777 CCTL_CCTL_CCTL_CCTL , /* 14 */
2780 /* c in SIT(c, syntax) must be an *unsigned char* or PEOA or PEOF,
2781 * caller must ensure proper cast on it if c is *char_ptr!
2783 /* Values for syntax param */
2784 #define BASESYNTAX 0 /* not in quotes */
2785 #define DQSYNTAX 1 /* in double quotes */
2786 #define SQSYNTAX 2 /* in single quotes */
2787 #define ARISYNTAX 3 /* in arithmetic */
2788 #define PSSYNTAX 4 /* prompt. never passed to SIT() */
2790 #if USE_SIT_FUNCTION
2793 SIT(int c, int syntax)
2795 /* Used to also have '/' in this string: "\t\n !\"$&'()*-/:;<=>?[\\]`|}~" */
2796 static const char spec_symbls[] ALIGN1 = "\t\n !\"$&'()*-:;<=>?[\\]`|}~";
2798 * This causes '/' to be prepended with CTLESC in dquoted string,
2799 * making "./file"* treated incorrectly because we feed
2800 * ".\/file*" string to glob(), confusing it (see expandmeta func).
2801 * The "homegrown" glob implementation is okay with that,
2802 * but glibc one isn't. With '/' always treated as CWORD,
2805 # if ENABLE_ASH_ALIAS
2806 static const uint8_t syntax_index_table[] ALIGN1 = {
2807 1, 2, 1, 3, 4, 5, 1, 6, /* "\t\n !\"$&'" */
2808 7, 8, 3, 3,/*3,*/3, 1, 1, /* "()*-/:;<" */
2809 3, 1, 3, 3, 9, 3, 10, 1, /* "=>?[\\]`|" */
2813 static const uint8_t syntax_index_table[] ALIGN1 = {
2814 0, 1, 0, 2, 3, 4, 0, 5, /* "\t\n !\"$&'" */
2815 6, 7, 2, 2,/*2,*/2, 0, 0, /* "()*-/:;<" */
2816 2, 0, 2, 2, 8, 2, 9, 0, /* "=>?[\\]`|" */
2825 # if ENABLE_ASH_ALIAS
2831 /* Cast is purely for paranoia here,
2832 * just in case someone passed signed char to us */
2833 if ((unsigned char)c >= CTL_FIRST
2834 && (unsigned char)c <= CTL_LAST
2838 s = strchrnul(spec_symbls, c);
2841 indx = syntax_index_table[s - spec_symbls];
2843 return (S_I_T[indx] >> (syntax*4)) & 0xf;
2846 #else /* !USE_SIT_FUNCTION */
2848 static const uint8_t syntax_index_table[] ALIGN1 = {
2849 /* BASESYNTAX_DQSYNTAX_SQSYNTAX_ARISYNTAX */
2850 /* 0 */ CWORD_CWORD_CWORD_CWORD,
2851 /* 1 */ CWORD_CWORD_CWORD_CWORD,
2852 /* 2 */ CWORD_CWORD_CWORD_CWORD,
2853 /* 3 */ CWORD_CWORD_CWORD_CWORD,
2854 /* 4 */ CWORD_CWORD_CWORD_CWORD,
2855 /* 5 */ CWORD_CWORD_CWORD_CWORD,
2856 /* 6 */ CWORD_CWORD_CWORD_CWORD,
2857 /* 7 */ CWORD_CWORD_CWORD_CWORD,
2858 /* 8 */ CWORD_CWORD_CWORD_CWORD,
2859 /* 9 "\t" */ CSPCL_CWORD_CWORD_CWORD,
2860 /* 10 "\n" */ CNL_CNL_CNL_CNL,
2861 /* 11 */ CWORD_CWORD_CWORD_CWORD,
2862 /* 12 */ CWORD_CWORD_CWORD_CWORD,
2863 /* 13 */ CWORD_CWORD_CWORD_CWORD,
2864 /* 14 */ CWORD_CWORD_CWORD_CWORD,
2865 /* 15 */ CWORD_CWORD_CWORD_CWORD,
2866 /* 16 */ CWORD_CWORD_CWORD_CWORD,
2867 /* 17 */ CWORD_CWORD_CWORD_CWORD,
2868 /* 18 */ CWORD_CWORD_CWORD_CWORD,
2869 /* 19 */ CWORD_CWORD_CWORD_CWORD,
2870 /* 20 */ CWORD_CWORD_CWORD_CWORD,
2871 /* 21 */ CWORD_CWORD_CWORD_CWORD,
2872 /* 22 */ CWORD_CWORD_CWORD_CWORD,
2873 /* 23 */ CWORD_CWORD_CWORD_CWORD,
2874 /* 24 */ CWORD_CWORD_CWORD_CWORD,
2875 /* 25 */ CWORD_CWORD_CWORD_CWORD,
2876 /* 26 */ CWORD_CWORD_CWORD_CWORD,
2877 /* 27 */ CWORD_CWORD_CWORD_CWORD,
2878 /* 28 */ CWORD_CWORD_CWORD_CWORD,
2879 /* 29 */ CWORD_CWORD_CWORD_CWORD,
2880 /* 30 */ CWORD_CWORD_CWORD_CWORD,
2881 /* 31 */ CWORD_CWORD_CWORD_CWORD,
2882 /* 32 " " */ CSPCL_CWORD_CWORD_CWORD,
2883 /* 33 "!" */ CWORD_CCTL_CCTL_CWORD,
2884 /* 34 """ */ CDQUOTE_CENDQUOTE_CWORD_CWORD,
2885 /* 35 "#" */ CWORD_CWORD_CWORD_CWORD,
2886 /* 36 "$" */ CVAR_CVAR_CWORD_CVAR,
2887 /* 37 "%" */ CWORD_CWORD_CWORD_CWORD,
2888 /* 38 "&" */ CSPCL_CWORD_CWORD_CWORD,
2889 /* 39 "'" */ CSQUOTE_CWORD_CENDQUOTE_CWORD,
2890 /* 40 "(" */ CSPCL_CWORD_CWORD_CLP,
2891 /* 41 ")" */ CSPCL_CWORD_CWORD_CRP,
2892 /* 42 "*" */ CWORD_CCTL_CCTL_CWORD,
2893 /* 43 "+" */ CWORD_CWORD_CWORD_CWORD,
2894 /* 44 "," */ CWORD_CWORD_CWORD_CWORD,
2895 /* 45 "-" */ CWORD_CCTL_CCTL_CWORD,
2896 /* 46 "." */ CWORD_CWORD_CWORD_CWORD,
2897 /* "/" was CWORD_CCTL_CCTL_CWORD, see comment in SIT() function why this is changed: */
2898 /* 47 "/" */ CWORD_CWORD_CWORD_CWORD,
2899 /* 48 "0" */ CWORD_CWORD_CWORD_CWORD,
2900 /* 49 "1" */ CWORD_CWORD_CWORD_CWORD,
2901 /* 50 "2" */ CWORD_CWORD_CWORD_CWORD,
2902 /* 51 "3" */ CWORD_CWORD_CWORD_CWORD,
2903 /* 52 "4" */ CWORD_CWORD_CWORD_CWORD,
2904 /* 53 "5" */ CWORD_CWORD_CWORD_CWORD,
2905 /* 54 "6" */ CWORD_CWORD_CWORD_CWORD,
2906 /* 55 "7" */ CWORD_CWORD_CWORD_CWORD,
2907 /* 56 "8" */ CWORD_CWORD_CWORD_CWORD,
2908 /* 57 "9" */ CWORD_CWORD_CWORD_CWORD,
2909 /* 58 ":" */ CWORD_CCTL_CCTL_CWORD,
2910 /* 59 ";" */ CSPCL_CWORD_CWORD_CWORD,
2911 /* 60 "<" */ CSPCL_CWORD_CWORD_CWORD,
2912 /* 61 "=" */ CWORD_CCTL_CCTL_CWORD,
2913 /* 62 ">" */ CSPCL_CWORD_CWORD_CWORD,
2914 /* 63 "?" */ CWORD_CCTL_CCTL_CWORD,
2915 /* 64 "@" */ CWORD_CWORD_CWORD_CWORD,
2916 /* 65 "A" */ CWORD_CWORD_CWORD_CWORD,
2917 /* 66 "B" */ CWORD_CWORD_CWORD_CWORD,
2918 /* 67 "C" */ CWORD_CWORD_CWORD_CWORD,
2919 /* 68 "D" */ CWORD_CWORD_CWORD_CWORD,
2920 /* 69 "E" */ CWORD_CWORD_CWORD_CWORD,
2921 /* 70 "F" */ CWORD_CWORD_CWORD_CWORD,
2922 /* 71 "G" */ CWORD_CWORD_CWORD_CWORD,
2923 /* 72 "H" */ CWORD_CWORD_CWORD_CWORD,
2924 /* 73 "I" */ CWORD_CWORD_CWORD_CWORD,
2925 /* 74 "J" */ CWORD_CWORD_CWORD_CWORD,
2926 /* 75 "K" */ CWORD_CWORD_CWORD_CWORD,
2927 /* 76 "L" */ CWORD_CWORD_CWORD_CWORD,
2928 /* 77 "M" */ CWORD_CWORD_CWORD_CWORD,
2929 /* 78 "N" */ CWORD_CWORD_CWORD_CWORD,
2930 /* 79 "O" */ CWORD_CWORD_CWORD_CWORD,
2931 /* 80 "P" */ CWORD_CWORD_CWORD_CWORD,
2932 /* 81 "Q" */ CWORD_CWORD_CWORD_CWORD,
2933 /* 82 "R" */ CWORD_CWORD_CWORD_CWORD,
2934 /* 83 "S" */ CWORD_CWORD_CWORD_CWORD,
2935 /* 84 "T" */ CWORD_CWORD_CWORD_CWORD,
2936 /* 85 "U" */ CWORD_CWORD_CWORD_CWORD,
2937 /* 86 "V" */ CWORD_CWORD_CWORD_CWORD,
2938 /* 87 "W" */ CWORD_CWORD_CWORD_CWORD,
2939 /* 88 "X" */ CWORD_CWORD_CWORD_CWORD,
2940 /* 89 "Y" */ CWORD_CWORD_CWORD_CWORD,
2941 /* 90 "Z" */ CWORD_CWORD_CWORD_CWORD,
2942 /* 91 "[" */ CWORD_CCTL_CCTL_CWORD,
2943 /* 92 "\" */ CBACK_CBACK_CCTL_CBACK,
2944 /* 93 "]" */ CWORD_CCTL_CCTL_CWORD,
2945 /* 94 "^" */ CWORD_CWORD_CWORD_CWORD,
2946 /* 95 "_" */ CWORD_CWORD_CWORD_CWORD,
2947 /* 96 "`" */ CBQUOTE_CBQUOTE_CWORD_CBQUOTE,
2948 /* 97 "a" */ CWORD_CWORD_CWORD_CWORD,
2949 /* 98 "b" */ CWORD_CWORD_CWORD_CWORD,
2950 /* 99 "c" */ CWORD_CWORD_CWORD_CWORD,
2951 /* 100 "d" */ CWORD_CWORD_CWORD_CWORD,
2952 /* 101 "e" */ CWORD_CWORD_CWORD_CWORD,
2953 /* 102 "f" */ CWORD_CWORD_CWORD_CWORD,
2954 /* 103 "g" */ CWORD_CWORD_CWORD_CWORD,
2955 /* 104 "h" */ CWORD_CWORD_CWORD_CWORD,
2956 /* 105 "i" */ CWORD_CWORD_CWORD_CWORD,
2957 /* 106 "j" */ CWORD_CWORD_CWORD_CWORD,
2958 /* 107 "k" */ CWORD_CWORD_CWORD_CWORD,
2959 /* 108 "l" */ CWORD_CWORD_CWORD_CWORD,
2960 /* 109 "m" */ CWORD_CWORD_CWORD_CWORD,
2961 /* 110 "n" */ CWORD_CWORD_CWORD_CWORD,
2962 /* 111 "o" */ CWORD_CWORD_CWORD_CWORD,
2963 /* 112 "p" */ CWORD_CWORD_CWORD_CWORD,
2964 /* 113 "q" */ CWORD_CWORD_CWORD_CWORD,
2965 /* 114 "r" */ CWORD_CWORD_CWORD_CWORD,
2966 /* 115 "s" */ CWORD_CWORD_CWORD_CWORD,
2967 /* 116 "t" */ CWORD_CWORD_CWORD_CWORD,
2968 /* 117 "u" */ CWORD_CWORD_CWORD_CWORD,
2969 /* 118 "v" */ CWORD_CWORD_CWORD_CWORD,
2970 /* 119 "w" */ CWORD_CWORD_CWORD_CWORD,
2971 /* 120 "x" */ CWORD_CWORD_CWORD_CWORD,
2972 /* 121 "y" */ CWORD_CWORD_CWORD_CWORD,
2973 /* 122 "z" */ CWORD_CWORD_CWORD_CWORD,
2974 /* 123 "{" */ CWORD_CWORD_CWORD_CWORD,
2975 /* 124 "|" */ CSPCL_CWORD_CWORD_CWORD,
2976 /* 125 "}" */ CENDVAR_CENDVAR_CWORD_CENDVAR,
2977 /* 126 "~" */ CWORD_CCTL_CCTL_CWORD,
2978 /* 127 del */ CWORD_CWORD_CWORD_CWORD,
2979 /* 128 0x80 */ CWORD_CWORD_CWORD_CWORD,
2980 /* 129 CTLESC */ CCTL_CCTL_CCTL_CCTL,
2981 /* 130 CTLVAR */ CCTL_CCTL_CCTL_CCTL,
2982 /* 131 CTLENDVAR */ CCTL_CCTL_CCTL_CCTL,
2983 /* 132 CTLBACKQ */ CCTL_CCTL_CCTL_CCTL,
2984 /* 133 CTLQUOTE */ CCTL_CCTL_CCTL_CCTL,
2985 /* 134 CTLARI */ CCTL_CCTL_CCTL_CCTL,
2986 /* 135 CTLENDARI */ CCTL_CCTL_CCTL_CCTL,
2987 /* 136 CTLQUOTEMARK */ CCTL_CCTL_CCTL_CCTL,
2988 /* 137 */ CWORD_CWORD_CWORD_CWORD,
2989 /* 138 */ CWORD_CWORD_CWORD_CWORD,
2990 /* 139 */ CWORD_CWORD_CWORD_CWORD,
2991 /* 140 */ CWORD_CWORD_CWORD_CWORD,
2992 /* 141 */ CWORD_CWORD_CWORD_CWORD,
2993 /* 142 */ CWORD_CWORD_CWORD_CWORD,
2994 /* 143 */ CWORD_CWORD_CWORD_CWORD,
2995 /* 144 */ CWORD_CWORD_CWORD_CWORD,
2996 /* 145 */ CWORD_CWORD_CWORD_CWORD,
2997 /* 146 */ CWORD_CWORD_CWORD_CWORD,
2998 /* 147 */ CWORD_CWORD_CWORD_CWORD,
2999 /* 148 */ CWORD_CWORD_CWORD_CWORD,
3000 /* 149 */ CWORD_CWORD_CWORD_CWORD,
3001 /* 150 */ CWORD_CWORD_CWORD_CWORD,
3002 /* 151 */ CWORD_CWORD_CWORD_CWORD,
3003 /* 152 */ CWORD_CWORD_CWORD_CWORD,
3004 /* 153 */ CWORD_CWORD_CWORD_CWORD,
3005 /* 154 */ CWORD_CWORD_CWORD_CWORD,
3006 /* 155 */ CWORD_CWORD_CWORD_CWORD,
3007 /* 156 */ CWORD_CWORD_CWORD_CWORD,
3008 /* 157 */ CWORD_CWORD_CWORD_CWORD,
3009 /* 158 */ CWORD_CWORD_CWORD_CWORD,
3010 /* 159 */ CWORD_CWORD_CWORD_CWORD,
3011 /* 160 */ CWORD_CWORD_CWORD_CWORD,
3012 /* 161 */ CWORD_CWORD_CWORD_CWORD,
3013 /* 162 */ CWORD_CWORD_CWORD_CWORD,
3014 /* 163 */ CWORD_CWORD_CWORD_CWORD,
3015 /* 164 */ CWORD_CWORD_CWORD_CWORD,
3016 /* 165 */ CWORD_CWORD_CWORD_CWORD,
3017 /* 166 */ CWORD_CWORD_CWORD_CWORD,
3018 /* 167 */ CWORD_CWORD_CWORD_CWORD,
3019 /* 168 */ CWORD_CWORD_CWORD_CWORD,
3020 /* 169 */ CWORD_CWORD_CWORD_CWORD,
3021 /* 170 */ CWORD_CWORD_CWORD_CWORD,
3022 /* 171 */ CWORD_CWORD_CWORD_CWORD,
3023 /* 172 */ CWORD_CWORD_CWORD_CWORD,
3024 /* 173 */ CWORD_CWORD_CWORD_CWORD,
3025 /* 174 */ CWORD_CWORD_CWORD_CWORD,
3026 /* 175 */ CWORD_CWORD_CWORD_CWORD,
3027 /* 176 */ CWORD_CWORD_CWORD_CWORD,
3028 /* 177 */ CWORD_CWORD_CWORD_CWORD,
3029 /* 178 */ CWORD_CWORD_CWORD_CWORD,
3030 /* 179 */ CWORD_CWORD_CWORD_CWORD,
3031 /* 180 */ CWORD_CWORD_CWORD_CWORD,
3032 /* 181 */ CWORD_CWORD_CWORD_CWORD,
3033 /* 182 */ CWORD_CWORD_CWORD_CWORD,
3034 /* 183 */ CWORD_CWORD_CWORD_CWORD,
3035 /* 184 */ CWORD_CWORD_CWORD_CWORD,
3036 /* 185 */ CWORD_CWORD_CWORD_CWORD,
3037 /* 186 */ CWORD_CWORD_CWORD_CWORD,
3038 /* 187 */ CWORD_CWORD_CWORD_CWORD,
3039 /* 188 */ CWORD_CWORD_CWORD_CWORD,
3040 /* 189 */ CWORD_CWORD_CWORD_CWORD,
3041 /* 190 */ CWORD_CWORD_CWORD_CWORD,
3042 /* 191 */ CWORD_CWORD_CWORD_CWORD,
3043 /* 192 */ CWORD_CWORD_CWORD_CWORD,
3044 /* 193 */ CWORD_CWORD_CWORD_CWORD,
3045 /* 194 */ CWORD_CWORD_CWORD_CWORD,
3046 /* 195 */ CWORD_CWORD_CWORD_CWORD,
3047 /* 196 */ CWORD_CWORD_CWORD_CWORD,
3048 /* 197 */ CWORD_CWORD_CWORD_CWORD,
3049 /* 198 */ CWORD_CWORD_CWORD_CWORD,
3050 /* 199 */ CWORD_CWORD_CWORD_CWORD,
3051 /* 200 */ CWORD_CWORD_CWORD_CWORD,
3052 /* 201 */ CWORD_CWORD_CWORD_CWORD,
3053 /* 202 */ CWORD_CWORD_CWORD_CWORD,
3054 /* 203 */ CWORD_CWORD_CWORD_CWORD,
3055 /* 204 */ CWORD_CWORD_CWORD_CWORD,
3056 /* 205 */ CWORD_CWORD_CWORD_CWORD,
3057 /* 206 */ CWORD_CWORD_CWORD_CWORD,
3058 /* 207 */ CWORD_CWORD_CWORD_CWORD,
3059 /* 208 */ CWORD_CWORD_CWORD_CWORD,
3060 /* 209 */ CWORD_CWORD_CWORD_CWORD,
3061 /* 210 */ CWORD_CWORD_CWORD_CWORD,
3062 /* 211 */ CWORD_CWORD_CWORD_CWORD,
3063 /* 212 */ CWORD_CWORD_CWORD_CWORD,
3064 /* 213 */ CWORD_CWORD_CWORD_CWORD,
3065 /* 214 */ CWORD_CWORD_CWORD_CWORD,
3066 /* 215 */ CWORD_CWORD_CWORD_CWORD,
3067 /* 216 */ CWORD_CWORD_CWORD_CWORD,
3068 /* 217 */ CWORD_CWORD_CWORD_CWORD,
3069 /* 218 */ CWORD_CWORD_CWORD_CWORD,
3070 /* 219 */ CWORD_CWORD_CWORD_CWORD,
3071 /* 220 */ CWORD_CWORD_CWORD_CWORD,
3072 /* 221 */ CWORD_CWORD_CWORD_CWORD,
3073 /* 222 */ CWORD_CWORD_CWORD_CWORD,
3074 /* 223 */ CWORD_CWORD_CWORD_CWORD,
3075 /* 224 */ CWORD_CWORD_CWORD_CWORD,
3076 /* 225 */ CWORD_CWORD_CWORD_CWORD,
3077 /* 226 */ CWORD_CWORD_CWORD_CWORD,
3078 /* 227 */ CWORD_CWORD_CWORD_CWORD,
3079 /* 228 */ CWORD_CWORD_CWORD_CWORD,
3080 /* 229 */ CWORD_CWORD_CWORD_CWORD,
3081 /* 230 */ CWORD_CWORD_CWORD_CWORD,
3082 /* 231 */ CWORD_CWORD_CWORD_CWORD,
3083 /* 232 */ CWORD_CWORD_CWORD_CWORD,
3084 /* 233 */ CWORD_CWORD_CWORD_CWORD,
3085 /* 234 */ CWORD_CWORD_CWORD_CWORD,
3086 /* 235 */ CWORD_CWORD_CWORD_CWORD,
3087 /* 236 */ CWORD_CWORD_CWORD_CWORD,
3088 /* 237 */ CWORD_CWORD_CWORD_CWORD,
3089 /* 238 */ CWORD_CWORD_CWORD_CWORD,
3090 /* 239 */ CWORD_CWORD_CWORD_CWORD,
3091 /* 230 */ CWORD_CWORD_CWORD_CWORD,
3092 /* 241 */ CWORD_CWORD_CWORD_CWORD,
3093 /* 242 */ CWORD_CWORD_CWORD_CWORD,
3094 /* 243 */ CWORD_CWORD_CWORD_CWORD,
3095 /* 244 */ CWORD_CWORD_CWORD_CWORD,
3096 /* 245 */ CWORD_CWORD_CWORD_CWORD,
3097 /* 246 */ CWORD_CWORD_CWORD_CWORD,
3098 /* 247 */ CWORD_CWORD_CWORD_CWORD,
3099 /* 248 */ CWORD_CWORD_CWORD_CWORD,
3100 /* 249 */ CWORD_CWORD_CWORD_CWORD,
3101 /* 250 */ CWORD_CWORD_CWORD_CWORD,
3102 /* 251 */ CWORD_CWORD_CWORD_CWORD,
3103 /* 252 */ CWORD_CWORD_CWORD_CWORD,
3104 /* 253 */ CWORD_CWORD_CWORD_CWORD,
3105 /* 254 */ CWORD_CWORD_CWORD_CWORD,
3106 /* 255 */ CWORD_CWORD_CWORD_CWORD,
3107 /* PEOF */ CENDFILE_CENDFILE_CENDFILE_CENDFILE,
3108 # if ENABLE_ASH_ALIAS
3109 /* PEOA */ CSPCL_CIGN_CIGN_CIGN,
3113 # define SIT(c, syntax) ((S_I_T[syntax_index_table[c]] >> ((syntax)*4)) & 0xf)
3115 #endif /* !USE_SIT_FUNCTION */
3118 /* ============ Alias handling */
3120 #if ENABLE_ASH_ALIAS
3122 #define ALIASINUSE 1
3133 static struct alias **atab; // [ATABSIZE];
3134 #define INIT_G_alias() do { \
3135 atab = xzalloc(ATABSIZE * sizeof(atab[0])); \
3139 static struct alias **
3140 __lookupalias(const char *name)
3142 unsigned int hashval;
3149 ch = (unsigned char)*p;
3153 ch = (unsigned char)*++p;
3155 app = &atab[hashval % ATABSIZE];
3157 for (; *app; app = &(*app)->next) {
3158 if (strcmp(name, (*app)->name) == 0) {
3166 static struct alias *
3167 lookupalias(const char *name, int check)
3169 struct alias *ap = *__lookupalias(name);
3171 if (check && ap && (ap->flag & ALIASINUSE))
3176 static struct alias *
3177 freealias(struct alias *ap)
3181 if (ap->flag & ALIASINUSE) {
3182 ap->flag |= ALIASDEAD;
3194 setalias(const char *name, const char *val)
3196 struct alias *ap, **app;
3198 app = __lookupalias(name);
3202 if (!(ap->flag & ALIASINUSE)) {
3205 ap->val = ckstrdup(val);
3206 ap->flag &= ~ALIASDEAD;
3209 ap = ckzalloc(sizeof(struct alias));
3210 ap->name = ckstrdup(name);
3211 ap->val = ckstrdup(val);
3212 /*ap->flag = 0; - ckzalloc did it */
3213 /*ap->next = NULL;*/
3220 unalias(const char *name)
3224 app = __lookupalias(name);
3228 *app = freealias(*app);
3239 struct alias *ap, **app;
3243 for (i = 0; i < ATABSIZE; i++) {
3245 for (ap = *app; ap; ap = *app) {
3246 *app = freealias(*app);
3256 printalias(const struct alias *ap)
3258 out1fmt("%s=%s\n", ap->name, single_quote(ap->val));
3262 * TODO - sort output
3264 static int FAST_FUNC
3265 aliascmd(int argc UNUSED_PARAM, char **argv)
3274 for (i = 0; i < ATABSIZE; i++) {
3275 for (ap = atab[i]; ap; ap = ap->next) {
3281 while ((n = *++argv) != NULL) {
3282 v = strchr(n+1, '=');
3283 if (v == NULL) { /* n+1: funny ksh stuff */
3284 ap = *__lookupalias(n);
3286 fprintf(stderr, "%s: %s not found\n", "alias", n);
3299 static int FAST_FUNC
3300 unaliascmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
3304 while ((i = nextopt("a")) != '\0') {
3310 for (i = 0; *argptr; argptr++) {
3311 if (unalias(*argptr)) {
3312 fprintf(stderr, "%s: %s not found\n", "unalias", *argptr);
3320 #endif /* ASH_ALIAS */
3323 /* Mode argument to forkshell. Don't change FORK_FG or FORK_BG. */
3326 #define FORK_NOJOB 2
3328 /* mode flags for showjob(s) */
3329 #define SHOW_ONLY_PGID 0x01 /* show only pgid (jobs -p) */
3330 #define SHOW_PIDS 0x02 /* show individual pids, not just one line per job */
3331 #define SHOW_CHANGED 0x04 /* only jobs whose state has changed */
3332 #define SHOW_STDERR 0x08 /* print to stderr (else stdout) */
3335 * A job structure contains information about a job. A job is either a
3336 * single process or a set of processes contained in a pipeline. In the
3337 * latter case, pidlist will be non-NULL, and will point to a -1 terminated
3341 pid_t ps_pid; /* process id */
3342 int ps_status; /* last process status from wait() */
3343 char *ps_cmd; /* text of command being run */
3347 struct procstat ps0; /* status of process */
3348 struct procstat *ps; /* status or processes when more than one */
3350 int stopstatus; /* status of a stopped job */
3353 nprocs: 16, /* number of processes */
3355 #define JOBRUNNING 0 /* at least one proc running */
3356 #define JOBSTOPPED 1 /* all procs are stopped */
3357 #define JOBDONE 2 /* all procs are completed */
3359 sigint: 1, /* job was killed by SIGINT */
3360 jobctl: 1, /* job running under job control */
3362 waited: 1, /* true if this entry has been waited for */
3363 used: 1, /* true if this entry is in used */
3364 changed: 1; /* true if status has changed */
3365 struct job *prev_job; /* previous job */
3368 static struct job *makejob(/*union node *,*/ int);
3369 static int forkshell(struct job *, union node *, int);
3370 static int waitforjob(struct job *);
3373 enum { doing_jobctl = 0 };
3374 #define setjobctl(on) do {} while (0)
3376 static smallint doing_jobctl; //references:8
3377 static void setjobctl(int);
3384 ignoresig(int signo)
3386 /* Avoid unnecessary system calls. Is it already SIG_IGNed? */
3387 if (sigmode[signo - 1] != S_IGN && sigmode[signo - 1] != S_HARD_IGN) {
3388 /* No, need to do it */
3389 signal(signo, SIG_IGN);
3391 sigmode[signo - 1] = S_HARD_IGN;
3395 * Only one usage site - in setsignal()
3398 signal_handler(int signo)
3400 gotsig[signo - 1] = 1;
3402 if (signo == SIGINT && !trap[SIGINT]) {
3403 if (!suppress_int) {
3405 raise_interrupt(); /* does not return */
3409 pending_sig = signo;
3414 * Set the signal handler for the specified signal. The routine figures
3415 * out what it should be set to.
3418 setsignal(int signo)
3421 char cur_act, new_act;
3422 struct sigaction act;
3426 if (t != NULL) { /* trap for this sig is set */
3428 if (t[0] == '\0') /* trap is "": ignore this sig */
3432 if (rootshell && new_act == S_DFL) {
3435 if (iflag || minusc || sflag == 0)
3444 * "In all cases, bash ignores SIGQUIT. Non-builtin
3445 * commands run by bash have signal handlers
3446 * set to the values inherited by the shell
3447 * from its parent". */
3463 //TODO: if !rootshell, we reset SIGQUIT to DFL,
3464 //whereas we have to restore it to what shell got on entry
3465 //from the parent. See comment above
3467 t = &sigmode[signo - 1];
3470 /* current setting is not yet known */
3471 if (sigaction(signo, NULL, &act)) {
3472 /* pretend it worked; maybe we should give a warning,
3473 * but other shells don't. We don't alter sigmode,
3474 * so we retry every time.
3475 * btw, in Linux it never fails. --vda */
3478 if (act.sa_handler == SIG_IGN) {
3479 cur_act = S_HARD_IGN;
3481 && (signo == SIGTSTP || signo == SIGTTIN || signo == SIGTTOU)
3483 cur_act = S_IGN; /* don't hard ignore these */
3487 if (cur_act == S_HARD_IGN || cur_act == new_act)
3490 act.sa_handler = SIG_DFL;
3493 act.sa_handler = signal_handler;
3496 act.sa_handler = SIG_IGN;
3500 /* flags and mask matter only if !DFL and !IGN, but we do it
3501 * for all cases for more deterministic behavior:
3504 sigfillset(&act.sa_mask);
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.
3567 if (!jp1 || jp1->state != JOBSTOPPED)
3570 jpp = &jp1->prev_job;
3576 /* newly stopped job - becomes curjob */
3577 jp->prev_job = *jpp;
3585 jobno(const struct job *jp)
3587 return jp - jobtab + 1;
3592 * Convert a job name to a job structure.
3595 #define getjob(name, getctl) getjob(name)
3598 getjob(const char *name, int getctl)
3602 const char *err_msg = "%s: no such job";
3606 char *(*match)(const char *, const char *);
3621 if (c == '+' || c == '%') {
3623 err_msg = "No current job";
3629 err_msg = "No previous job";
3639 if (num > 0 && num <= njobs) {
3640 jp = jobtab + num - 1;
3655 if (match(jp->ps[0].ps_cmd, p)) {
3659 err_msg = "%s: ambiguous";
3669 err_msg = "job %s not created under job control";
3670 if (getctl && jp->jobctl == 0)
3675 ash_msg_and_raise_error(err_msg, name);
3679 * Mark a job structure as unused.
3682 freejob(struct job *jp)
3684 struct procstat *ps;
3688 for (i = jp->nprocs, ps = jp->ps; --i >= 0; ps++) {
3689 if (ps->ps_cmd != nullstr)
3692 if (jp->ps != &jp->ps0)
3695 set_curjob(jp, CUR_DELETE);
3701 xtcsetpgrp(int fd, pid_t pgrp)
3703 if (tcsetpgrp(fd, pgrp))
3704 ash_msg_and_raise_error("can't set tty process group (%m)");
3708 * Turn job control on and off.
3710 * Note: This code assumes that the third arg to ioctl is a character
3711 * pointer, which is true on Berkeley systems but not System V. Since
3712 * System V doesn't have job control yet, this isn't a problem now.
3714 * Called with interrupts off.
3722 if (on == doing_jobctl || rootshell == 0)
3726 ofd = fd = open(_PATH_TTY, O_RDWR);
3728 /* BTW, bash will try to open(ttyname(0)) if open("/dev/tty") fails.
3729 * That sometimes helps to acquire controlling tty.
3730 * Obviously, a workaround for bugs when someone
3731 * failed to provide a controlling tty to bash! :) */
3737 /* fd is a tty at this point */
3738 fd = fcntl(fd, F_DUPFD, 10);
3739 if (ofd >= 0) /* if it is "/dev/tty", close. If 0/1/2, dont */
3742 goto out; /* F_DUPFD failed */
3743 close_on_exec_on(fd);
3744 while (1) { /* while we are in the background */
3745 pgrp = tcgetpgrp(fd);
3748 ash_msg("can't access tty; job control turned off");
3752 if (pgrp == getpgrp())
3763 xtcsetpgrp(fd, pgrp);
3765 /* turning job control off */
3768 /* was xtcsetpgrp, but this can make exiting ash
3769 * loop forever if pty is already deleted */
3770 tcsetpgrp(fd, pgrp);
3784 static int FAST_FUNC
3785 killcmd(int argc, char **argv)
3787 if (argv[1] && strcmp(argv[1], "-l") != 0) {
3790 if (argv[i][0] == '%') {
3792 * "kill %N" - job kill
3793 * Converting to pgrp / pid kill
3799 jp = getjob(argv[i], 0);
3801 * In jobs started under job control, we signal
3802 * entire process group by kill -PGRP_ID.
3803 * This happens, f.e., in interactive shell.
3805 * Otherwise, we signal each child via
3806 * kill PID1 PID2 PID3.
3808 * sh -c 'sleep 1|sleep 1 & kill %1'
3809 * sh -c 'true|sleep 2 & sleep 1; kill %1'
3810 * sh -c 'true|sleep 1 & sleep 2; kill %1'
3812 n = jp->nprocs; /* can't be 0 (I hope) */
3815 dst = alloca(n * sizeof(int)*4);
3817 for (j = 0; j < n; j++) {
3818 struct procstat *ps = &jp->ps[j];
3819 /* Skip non-running and not-stopped members
3820 * (i.e. dead members) of the job
3822 if (ps->ps_status != -1 && !WIFSTOPPED(ps->ps_status))
3825 * kill_main has matching code to expect
3826 * leading space. Needed to not confuse
3827 * negative pids with "kill -SIGNAL_NO" syntax
3829 dst += sprintf(dst, jp->jobctl ? " -%u" : " %u", (int)ps->ps_pid);
3833 } while (argv[++i]);
3835 return kill_main(argc, argv);
3839 showpipe(struct job *jp /*, FILE *out*/)
3841 struct procstat *ps;
3842 struct procstat *psend;
3844 psend = jp->ps + jp->nprocs;
3845 for (ps = jp->ps + 1; ps < psend; ps++)
3846 printf(" | %s", ps->ps_cmd);
3847 newline_and_flush(stdout);
3848 flush_stdout_stderr();
3853 restartjob(struct job *jp, int mode)
3855 struct procstat *ps;
3861 if (jp->state == JOBDONE)
3863 jp->state = JOBRUNNING;
3864 pgid = jp->ps[0].ps_pid;
3865 if (mode == FORK_FG)
3866 xtcsetpgrp(ttyfd, pgid);
3867 killpg(pgid, SIGCONT);
3871 if (WIFSTOPPED(ps->ps_status)) {
3877 status = (mode == FORK_FG) ? waitforjob(jp) : 0;
3882 static int FAST_FUNC
3883 fg_bgcmd(int argc UNUSED_PARAM, char **argv)
3889 mode = (**argv == 'f') ? FORK_FG : FORK_BG;
3893 jp = getjob(*argv, 1);
3894 if (mode == FORK_BG) {
3895 set_curjob(jp, CUR_RUNNING);
3896 printf("[%d] ", jobno(jp));
3898 out1str(jp->ps[0].ps_cmd);
3899 showpipe(jp /*, stdout*/);
3900 retval = restartjob(jp, mode);
3901 } while (*argv && *++argv);
3907 sprint_status48(char *s, int status, int sigonly)
3913 if (!WIFEXITED(status)) {
3914 if (JOBS && WIFSTOPPED(status))
3915 st = WSTOPSIG(status);
3917 st = WTERMSIG(status);
3919 if (st == SIGINT || st == SIGPIPE)
3921 if (JOBS && WIFSTOPPED(status))
3925 //TODO: use bbox's get_signame? strsignal adds ~600 bytes to text+rodata
3926 col = fmtstr(s, 32, strsignal(st));
3927 if (WCOREDUMP(status)) {
3928 strcpy(s + col, " (core dumped)");
3929 col += sizeof(" (core dumped)")-1;
3931 } else if (!sigonly) {
3932 st = WEXITSTATUS(status);
3933 col = fmtstr(s, 16, (st ? "Done(%d)" : "Done"), st);
3940 dowait(int wait_flags, struct job *job)
3945 struct job *thisjob;
3947 TRACE(("dowait(0x%x) called\n", wait_flags));
3949 /* Do a wait system call. If job control is compiled in, we accept
3950 * stopped processes. wait_flags may have WNOHANG, preventing blocking.
3951 * NB: _not_ safe_waitpid, we need to detect EINTR */
3953 wait_flags |= WUNTRACED;
3954 pid = waitpid(-1, &status, wait_flags);
3955 TRACE(("wait returns pid=%d, status=0x%x, errno=%d(%s)\n",
3956 pid, status, errno, strerror(errno)));
3962 for (jp = curjob; jp; jp = jp->prev_job) {
3964 struct procstat *ps;
3965 struct procstat *psend;
3966 if (jp->state == JOBDONE)
3970 psend = ps + jp->nprocs;
3972 if (ps->ps_pid == pid) {
3973 TRACE(("Job %d: changing status of proc %d "
3974 "from 0x%x to 0x%x\n",
3975 jobno(jp), pid, ps->ps_status, status));
3976 ps->ps_status = status;
3979 if (ps->ps_status == -1)
3980 jobstate = JOBRUNNING;
3982 if (jobstate == JOBRUNNING)
3984 if (WIFSTOPPED(ps->ps_status)) {
3985 jp->stopstatus = ps->ps_status;
3986 jobstate = JOBSTOPPED;
3989 } while (++ps < psend);
3993 /* Found the job where one of its processes changed its state.
3994 * Is there at least one live and running process in this job? */
3995 if (jobstate != JOBRUNNING) {
3996 /* No. All live processes in the job are stopped
3997 * (JOBSTOPPED) or there are no live processes (JOBDONE)
3999 thisjob->changed = 1;
4000 if (thisjob->state != jobstate) {
4001 TRACE(("Job %d: changing state from %d to %d\n",
4002 jobno(thisjob), thisjob->state, jobstate));
4003 thisjob->state = jobstate;
4005 if (jobstate == JOBSTOPPED)
4006 set_curjob(thisjob, CUR_STOPPED);
4012 /* The process wasn't found in job list */
4013 if (JOBS && !WIFSTOPPED(status))
4018 if (thisjob && thisjob == job) {
4022 len = sprint_status48(s, status, 1);
4033 blocking_wait_with_raise_on_sig(void)
4035 pid_t pid = dowait(DOWAIT_BLOCK, NULL);
4036 if (pid <= 0 && pending_sig)
4037 raise_exception(EXSIG);
4043 showjob(struct job *jp, int mode)
4045 struct procstat *ps;
4046 struct procstat *psend;
4049 char s[16 + 16 + 48];
4050 FILE *out = (mode & SHOW_STDERR ? stderr : stdout);
4054 if (mode & SHOW_ONLY_PGID) { /* jobs -p */
4055 /* just output process (group) id of pipeline */
4056 fprintf(out, "%d\n", ps->ps_pid);
4060 col = fmtstr(s, 16, "[%d] ", jobno(jp));
4065 else if (curjob && jp == curjob->prev_job)
4068 if (mode & SHOW_PIDS)
4069 col += fmtstr(s + col, 16, "%d ", ps->ps_pid);
4071 psend = ps + jp->nprocs;
4073 if (jp->state == JOBRUNNING) {
4074 strcpy(s + col, "Running");
4075 col += sizeof("Running") - 1;
4077 int status = psend[-1].ps_status;
4078 if (jp->state == JOBSTOPPED)
4079 status = jp->stopstatus;
4080 col += sprint_status48(s + col, status, 0);
4082 /* By now, "[JOBID]* [maybe PID] STATUS" is printed */
4084 /* This loop either prints "<cmd1> | <cmd2> | <cmd3>" line
4085 * or prints several "PID | <cmdN>" lines,
4086 * depending on SHOW_PIDS bit.
4087 * We do not print status of individual processes
4088 * between PID and <cmdN>. bash does it, but not very well:
4089 * first line shows overall job status, not process status,
4090 * making it impossible to know 1st process status.
4094 /* for each process */
4097 if (mode & SHOW_PIDS)
4098 col = fmtstr(s, 48, "\n%*c%d ", indent_col, ' ', ps->ps_pid) - 1;
4100 fprintf(out, "%s%*c%s%s",
4102 33 - col >= 0 ? 33 - col : 0, ' ',
4103 ps == jp->ps ? "" : "| ",
4106 } while (++ps != psend);
4107 newline_and_flush(out);
4111 if (jp->state == JOBDONE) {
4112 TRACE(("showjob: freeing job %d\n", jobno(jp)));
4118 * Print a list of jobs. If "change" is nonzero, only print jobs whose
4119 * statuses have changed since the last call to showjobs.
4126 TRACE(("showjobs(0x%x) called\n", mode));
4128 /* Handle all finished jobs */
4129 while (dowait(DOWAIT_NONBLOCK, NULL) > 0)
4132 for (jp = curjob; jp; jp = jp->prev_job) {
4133 if (!(mode & SHOW_CHANGED) || jp->changed) {
4139 static int FAST_FUNC
4140 jobscmd(int argc UNUSED_PARAM, char **argv)
4145 while ((m = nextopt("lp")) != '\0') {
4149 mode |= SHOW_ONLY_PGID;
4155 showjob(getjob(*argv, 0), mode);
4165 /* Called only on finished or stopped jobs (no members are running) */
4167 getstatus(struct job *job)
4171 struct procstat *ps;
4173 /* Fetch last member's status */
4174 ps = job->ps + job->nprocs - 1;
4175 status = ps->ps_status;
4177 /* "set -o pipefail" mode: use last _nonzero_ status */
4178 while (status == 0 && --ps >= job->ps)
4179 status = ps->ps_status;
4182 retval = WEXITSTATUS(status);
4183 if (!WIFEXITED(status)) {
4185 retval = WSTOPSIG(status);
4186 if (!WIFSTOPPED(status))
4189 /* XXX: limits number of signals */
4190 retval = WTERMSIG(status);
4192 if (retval == SIGINT)
4198 TRACE(("getstatus: job %d, nproc %d, status 0x%x, retval 0x%x\n",
4199 jobno(job), job->nprocs, status, retval));
4203 static int FAST_FUNC
4204 waitcmd(int argc UNUSED_PARAM, char **argv)
4211 raise_exception(EXSIG);
4218 /* wait for all jobs */
4222 if (!jp) /* no running procs */
4224 if (jp->state == JOBRUNNING)
4229 blocking_wait_with_raise_on_sig();
4231 * "When bash is waiting for an asynchronous command via
4232 * the wait builtin, the reception of a signal for which a trap
4233 * has been set will cause the wait builtin to return immediately
4234 * with an exit status greater than 128, immediately after which
4235 * the trap is executed."
4237 * blocking_wait_with_raise_on_sig raises signal handlers
4238 * if it gets no pid (pid < 0). However,
4239 * if child sends us a signal *and immediately exits*,
4240 * blocking_wait_with_raise_on_sig gets pid > 0
4241 * and does not handle pending_sig. Check this case: */
4243 raise_exception(EXSIG);
4249 if (**argv != '%') {
4250 pid_t pid = number(*argv);
4255 if (job->ps[job->nprocs - 1].ps_pid == pid)
4257 job = job->prev_job;
4260 job = getjob(*argv, 0);
4262 /* loop until process terminated or stopped */
4263 while (job->state == JOBRUNNING)
4264 blocking_wait_with_raise_on_sig();
4266 retval = getstatus(job);
4279 struct job *jp, *jq;
4281 len = njobs * sizeof(*jp);
4283 jp = ckrealloc(jq, len + 4 * sizeof(*jp));
4285 offset = (char *)jp - (char *)jq;
4287 /* Relocate pointers */
4290 jq = (struct job *)((char *)jq + l);
4294 #define joff(p) ((struct job *)((char *)(p) + l))
4295 #define jmove(p) (p) = (void *)((char *)(p) + offset)
4296 if (joff(jp)->ps == &jq->ps0)
4297 jmove(joff(jp)->ps);
4298 if (joff(jp)->prev_job)
4299 jmove(joff(jp)->prev_job);
4309 jp = (struct job *)((char *)jp + len);
4313 } while (--jq >= jp);
4318 * Return a new job structure.
4319 * Called with interrupts off.
4322 makejob(/*union node *node,*/ int nprocs)
4327 for (i = njobs, jp = jobtab; ; jp++) {
4334 if (jp->state != JOBDONE || !jp->waited)
4343 memset(jp, 0, sizeof(*jp));
4345 /* jp->jobctl is a bitfield.
4346 * "jp->jobctl |= jobctl" likely to give awful code */
4350 jp->prev_job = curjob;
4355 jp->ps = ckmalloc(nprocs * sizeof(struct procstat));
4357 TRACE(("makejob(%d) returns %%%d\n", nprocs,
4364 * Return a string identifying a command (to be printed by the
4367 static char *cmdnextc;
4370 cmdputs(const char *s)
4372 static const char vstype[VSTYPE + 1][3] = {
4373 "", "}", "-", "+", "?", "=",
4374 "%", "%%", "#", "##"
4375 IF_ASH_BASH_COMPAT(, ":", "/", "//")
4378 const char *p, *str;
4382 unsigned char subtype = 0;
4386 nextc = makestrspace((strlen(s) + 1) * 8, cmdnextc);
4388 while ((c = *p++) != '\0') {
4396 if ((subtype & VSTYPE) == VSLENGTH)
4402 str = "\"}" + !(quoted & 1);
4409 #if ENABLE_SH_MATH_SUPPORT
4424 if ((subtype & VSTYPE) != VSNORMAL)
4426 str = vstype[subtype & VSTYPE];
4427 if (subtype & VSNUL)
4436 /* These can only happen inside quotes */
4449 while ((c = *str++) != '\0') {
4452 } /* while *p++ not NUL */
4455 USTPUTC('"', nextc);
4461 /* cmdtxt() and cmdlist() call each other */
4462 static void cmdtxt(union node *n);
4465 cmdlist(union node *np, int sep)
4467 for (; np; np = np->narg.next) {
4471 if (sep && np->narg.next)
4477 cmdtxt(union node *n)
4480 struct nodelist *lp;
4491 lp = n->npipe.cmdlist;
4509 cmdtxt(n->nbinary.ch1);
4525 cmdtxt(n->nif.test);
4527 if (n->nif.elsepart) {
4528 cmdtxt(n->nif.ifpart);
4530 n = n->nif.elsepart;
4548 cmdtxt(n->nbinary.ch1);
4558 cmdputs(n->nfor.var);
4560 cmdlist(n->nfor.args, 1);
4565 cmdputs(n->narg.text);
4569 cmdlist(n->ncmd.args, 1);
4570 cmdlist(n->ncmd.redirect, 0);
4583 cmdputs(n->ncase.expr->narg.text);
4585 for (np = n->ncase.cases; np; np = np->nclist.next) {
4586 cmdtxt(np->nclist.pattern);
4588 cmdtxt(np->nclist.body);
4602 #if ENABLE_ASH_BASH_COMPAT
4617 cmdputs(utoa(n->nfile.fd));
4619 if (n->type == NTOFD || n->type == NFROMFD) {
4620 cmdputs(utoa(n->ndup.dupfd));
4629 commandtext(union node *n)
4633 STARTSTACKSTR(cmdnextc);
4635 name = stackblock();
4636 TRACE(("commandtext: name %p, end %p\n", name, cmdnextc));
4637 return ckstrdup(name);
4642 * Fork off a subshell. If we are doing job control, give the subshell its
4643 * own process group. Jp is a job structure that the job is to be added to.
4644 * N is the command that will be evaluated by the child. Both jp and n may
4645 * be NULL. The mode parameter can be one of the following:
4646 * FORK_FG - Fork off a foreground process.
4647 * FORK_BG - Fork off a background process.
4648 * FORK_NOJOB - Like FORK_FG, but don't give the process its own
4649 * process group even if job control is on.
4651 * When job control is turned off, background processes have their standard
4652 * input redirected to /dev/null (except for the second and later processes
4655 * Called with interrupts off.
4658 * Clear traps on a fork.
4665 for (tp = trap; tp < &trap[NSIG]; tp++) {
4666 if (*tp && **tp) { /* trap not NULL or "" (SIG_IGN) */
4668 if (trap_ptr == trap)
4670 /* else: it "belongs" to trap_ptr vector, don't free */
4672 if ((tp - trap) != 0)
4673 setsignal(tp - trap);
4680 /* Lives far away from here, needed for forkchild */
4681 static void closescript(void);
4683 /* Called after fork(), in child */
4684 static NOINLINE void
4685 forkchild(struct job *jp, union node *n, int mode)
4689 TRACE(("Child shell %d\n", getpid()));
4693 /* man bash: "Non-builtin commands run by bash have signal handlers
4694 * set to the values inherited by the shell from its parent".
4695 * Do we do it correctly? */
4699 if (mode == FORK_NOJOB /* is it `xxx` ? */
4700 && n && n->type == NCMD /* is it single cmd? */
4701 /* && n->ncmd.args->type == NARG - always true? */
4702 && n->ncmd.args && strcmp(n->ncmd.args->narg.text, "trap") == 0
4703 && n->ncmd.args->narg.next == NULL /* "trap" with no arguments */
4704 /* && n->ncmd.args->narg.backquote == NULL - do we need to check this? */
4706 TRACE(("Trap hack\n"));
4707 /* Awful hack for `trap` or $(trap).
4709 * http://www.opengroup.org/onlinepubs/009695399/utilities/trap.html
4710 * contains an example where "trap" is executed in a subshell:
4712 * save_traps=$(trap)
4714 * eval "$save_traps"
4716 * Standard does not say that "trap" in subshell shall print
4717 * parent shell's traps. It only says that its output
4718 * must have suitable form, but then, in the above example
4719 * (which is not supposed to be normative), it implies that.
4721 * bash (and probably other shell) does implement it
4722 * (traps are reset to defaults, but "trap" still shows them),
4723 * but as a result, "trap" logic is hopelessly messed up:
4726 * trap -- 'echo Ho' SIGWINCH <--- we have a handler
4727 * # (trap) <--- trap is in subshell - no output (correct, traps are reset)
4728 * # true | trap <--- trap is in subshell - no output (ditto)
4729 * # echo `true | trap` <--- in subshell - output (but traps are reset!)
4730 * trap -- 'echo Ho' SIGWINCH
4731 * # echo `(trap)` <--- in subshell in subshell - output
4732 * trap -- 'echo Ho' SIGWINCH
4733 * # echo `true | (trap)` <--- in subshell in subshell in subshell - output!
4734 * trap -- 'echo Ho' SIGWINCH
4736 * The rules when to forget and when to not forget traps
4737 * get really complex and nonsensical.
4739 * Our solution: ONLY bare $(trap) or `trap` is special.
4741 /* Save trap handler strings for trap builtin to print */
4742 trap_ptr = xmemdup(trap, sizeof(trap));
4743 /* Fall through into clearing traps */
4747 /* do job control only in root shell */
4749 if (mode != FORK_NOJOB && jp->jobctl && oldlvl == 0) {
4752 if (jp->nprocs == 0)
4755 pgrp = jp->ps[0].ps_pid;
4756 /* this can fail because we are doing it in the parent also */
4758 if (mode == FORK_FG)
4759 xtcsetpgrp(ttyfd, pgrp);
4764 if (mode == FORK_BG) {
4765 /* man bash: "When job control is not in effect,
4766 * asynchronous commands ignore SIGINT and SIGQUIT" */
4769 if (jp->nprocs == 0) {
4771 if (open(bb_dev_null, O_RDONLY) != 0)
4772 ash_msg_and_raise_error("can't open '%s'", bb_dev_null);
4776 if (iflag) { /* why if iflag only? */
4781 * "In all cases, bash ignores SIGQUIT. Non-builtin
4782 * commands run by bash have signal handlers
4783 * set to the values inherited by the shell
4785 * Take care of the second rule: */
4789 if (n && n->type == NCMD
4790 && n->ncmd.args && strcmp(n->ncmd.args->narg.text, "jobs") == 0
4792 TRACE(("Job hack\n"));
4793 /* "jobs": we do not want to clear job list for it,
4794 * instead we remove only _its_ own_ job from job list.
4795 * This makes "jobs .... | cat" more useful.
4801 for (jp = curjob; jp; jp = jp->prev_job)
4806 /* Called after fork(), in parent */
4808 #define forkparent(jp, n, mode, pid) forkparent(jp, mode, pid)
4811 forkparent(struct job *jp, union node *n, int mode, pid_t pid)
4813 TRACE(("In parent shell: child = %d\n", pid));
4815 while (jobless && dowait(DOWAIT_NONBLOCK, NULL) > 0)
4821 if (mode != FORK_NOJOB && jp->jobctl) {
4824 if (jp->nprocs == 0)
4827 pgrp = jp->ps[0].ps_pid;
4828 /* This can fail because we are doing it in the child also */
4832 if (mode == FORK_BG) {
4833 backgndpid = pid; /* set $! */
4834 set_curjob(jp, CUR_RUNNING);
4837 struct procstat *ps = &jp->ps[jp->nprocs++];
4840 ps->ps_cmd = nullstr;
4842 if (doing_jobctl && n)
4843 ps->ps_cmd = commandtext(n);
4849 forkshell(struct job *jp, union node *n, int mode)
4853 TRACE(("forkshell(%%%d, %p, %d) called\n", jobno(jp), n, mode));
4856 TRACE(("Fork failed, errno=%d", errno));
4859 ash_msg_and_raise_error("can't fork");
4862 CLEAR_RANDOM_T(&random_gen); /* or else $RANDOM repeats in child */
4863 forkchild(jp, n, mode);
4865 forkparent(jp, n, mode, pid);
4871 * Wait for job to finish.
4873 * Under job control we have the problem that while a child process
4874 * is running interrupts generated by the user are sent to the child
4875 * but not to the shell. This means that an infinite loop started by
4876 * an interactive user may be hard to kill. With job control turned off,
4877 * an interactive user may place an interactive program inside a loop.
4878 * If the interactive program catches interrupts, the user doesn't want
4879 * these interrupts to also abort the loop. The approach we take here
4880 * is to have the shell ignore interrupt signals while waiting for a
4881 * foreground process to terminate, and then send itself an interrupt
4882 * signal if the child process was terminated by an interrupt signal.
4883 * Unfortunately, some programs want to do a bit of cleanup and then
4884 * exit on interrupt; unless these processes terminate themselves by
4885 * sending a signal to themselves (instead of calling exit) they will
4886 * confuse this approach.
4888 * Called with interrupts off.
4891 waitforjob(struct job *jp)
4895 TRACE(("waitforjob(%%%d) called\n", jobno(jp)));
4898 while (jp->state == JOBRUNNING) {
4899 /* In non-interactive shells, we _can_ get
4900 * a keyboard signal here and be EINTRed,
4901 * but we just loop back, waiting for command to complete.
4904 * "If bash is waiting for a command to complete and receives
4905 * a signal for which a trap has been set, the trap
4906 * will not be executed until the command completes."
4908 * Reality is that even if trap is not set, bash
4909 * will not act on the signal until command completes.
4910 * Try this. sleep5intoff.c:
4911 * #include <signal.h>
4912 * #include <unistd.h>
4915 * sigemptyset(&set);
4916 * sigaddset(&set, SIGINT);
4917 * sigaddset(&set, SIGQUIT);
4918 * sigprocmask(SIG_BLOCK, &set, NULL);
4922 * $ bash -c './sleep5intoff; echo hi'
4923 * ^C^C^C^C <--- pressing ^C once a second
4925 * $ bash -c './sleep5intoff; echo hi'
4926 * ^\^\^\^\hi <--- pressing ^\ (SIGQUIT)
4929 dowait(DOWAIT_BLOCK, jp);
4936 xtcsetpgrp(ttyfd, rootpid);
4938 * This is truly gross.
4939 * If we're doing job control, then we did a TIOCSPGRP which
4940 * caused us (the shell) to no longer be in the controlling
4941 * session -- so we wouldn't have seen any ^C/SIGINT. So, we
4942 * intuit from the subprocess exit status whether a SIGINT
4943 * occurred, and if so interrupt ourselves. Yuck. - mycroft
4945 if (jp->sigint) /* TODO: do the same with all signals */
4946 raise(SIGINT); /* ... by raise(jp->sig) instead? */
4948 if (jp->state == JOBDONE)
4955 * return 1 if there are stopped jobs, otherwise 0
4967 if (jp && jp->state == JOBSTOPPED) {
4968 out2str("You have stopped jobs.\n");
4977 /* ============ redir.c
4979 * Code for dealing with input/output redirection.
4984 #define EMPTY -2 /* marks an unused slot in redirtab */
4985 #define CLOSED -3 /* marks a slot of previously-closed fd */
4988 * Open a file in noclobber mode.
4989 * The code was copied from bash.
4992 noclobberopen(const char *fname)
4995 struct stat finfo, finfo2;
4998 * If the file exists and is a regular file, return an error
5001 r = stat(fname, &finfo);
5002 if (r == 0 && S_ISREG(finfo.st_mode)) {
5008 * If the file was not present (r != 0), make sure we open it
5009 * exclusively so that if it is created before we open it, our open
5010 * will fail. Make sure that we do not truncate an existing file.
5011 * Note that we don't turn on O_EXCL unless the stat failed -- if the
5012 * file was not a regular file, we leave O_EXCL off.
5015 return open(fname, O_WRONLY|O_CREAT|O_EXCL, 0666);
5016 fd = open(fname, O_WRONLY|O_CREAT, 0666);
5018 /* If the open failed, return the file descriptor right away. */
5023 * OK, the open succeeded, but the file may have been changed from a
5024 * non-regular file to a regular file between the stat and the open.
5025 * We are assuming that the O_EXCL open handles the case where FILENAME
5026 * did not exist and is symlinked to an existing file between the stat
5031 * If we can open it and fstat the file descriptor, and neither check
5032 * revealed that it was a regular file, and the file has not been
5033 * replaced, return the file descriptor.
5035 if (fstat(fd, &finfo2) == 0
5036 && !S_ISREG(finfo2.st_mode)
5037 && finfo.st_dev == finfo2.st_dev
5038 && finfo.st_ino == finfo2.st_ino
5043 /* The file has been replaced. badness. */
5050 * Handle here documents. Normally we fork off a process to write the
5051 * data to a pipe. If the document is short, we can stuff the data in
5052 * the pipe without forking.
5054 /* openhere needs this forward reference */
5055 static void expandhere(union node *arg, int fd);
5057 openhere(union node *redir)
5063 ash_msg_and_raise_error("pipe call failed");
5064 if (redir->type == NHERE) {
5065 len = strlen(redir->nhere.doc->narg.text);
5066 if (len <= PIPE_BUF) {
5067 full_write(pip[1], redir->nhere.doc->narg.text, len);
5071 if (forkshell((struct job *)NULL, (union node *)NULL, FORK_NOJOB) == 0) {
5074 ignoresig(SIGINT); //signal(SIGINT, SIG_IGN);
5075 ignoresig(SIGQUIT); //signal(SIGQUIT, SIG_IGN);
5076 ignoresig(SIGHUP); //signal(SIGHUP, SIG_IGN);
5077 ignoresig(SIGTSTP); //signal(SIGTSTP, SIG_IGN);
5078 signal(SIGPIPE, SIG_DFL);
5079 if (redir->type == NHERE)
5080 full_write(pip[1], redir->nhere.doc->narg.text, len);
5082 expandhere(redir->nhere.doc, pip[1]);
5083 _exit(EXIT_SUCCESS);
5091 openredirect(union node *redir)
5096 switch (redir->nfile.type) {
5097 /* Can't happen, our single caller does this itself */
5103 return openhere(redir);
5106 /* For N[X]HERE, reading redir->nfile.expfname would touch beyond
5107 * allocated space. Do it only when we know it is safe.
5109 fname = redir->nfile.expfname;
5111 switch (redir->nfile.type) {
5117 f = open(fname, O_RDONLY);
5122 f = open(fname, O_RDWR|O_CREAT, 0666);
5127 #if ENABLE_ASH_BASH_COMPAT
5130 /* Take care of noclobber mode. */
5132 f = noclobberopen(fname);
5139 f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666);
5144 f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666);
5152 ash_msg_and_raise_error("can't create %s: %s", fname, errmsg(errno, "nonexistent directory"));
5154 ash_msg_and_raise_error("can't open %s: %s", fname, errmsg(errno, "no such file"));
5158 * Copy a file descriptor to be >= 10. Throws exception on error.
5166 newfd = fcntl(from, F_DUPFD, 10);
5167 err = newfd < 0 ? errno : 0;
5170 ash_msg_and_raise_error("%d: %m", from);
5172 fcntl(newfd, F_SETFD, FD_CLOEXEC);
5178 dup2_or_raise(int from, int to)
5182 newfd = (from != to) ? dup2(from, to) : to;
5184 /* Happens when source fd is not open: try "echo >&99" */
5185 ash_msg_and_raise_error("%d: %m", from);
5190 /* Struct def and variable are moved down to the first usage site */
5195 struct redirtab *next;
5197 struct two_fd_t two_fd[];
5199 #define redirlist (G_var.redirlist)
5201 COPYFD_RESTORE = (int)~(INT_MAX),
5205 need_to_remember(struct redirtab *rp, int fd)
5209 if (!rp) /* remembering was not requested */
5212 for (i = 0; i < rp->pair_count; i++) {
5213 if (rp->two_fd[i].orig == fd) {
5214 /* already remembered */
5221 /* "hidden" fd is a fd used to read scripts, or a copy of such */
5223 is_hidden_fd(struct redirtab *rp, int fd)
5226 struct parsefile *pf;
5230 /* Check open scripts' fds */
5233 /* We skip pf_fd == 0 case because of the following case:
5234 * $ ash # running ash interactively
5236 * and in script.sh: "exec 9>&0".
5237 * Even though top-level pf_fd _is_ 0,
5238 * it's still ok to use it: "read" builtin uses it,
5239 * why should we cripple "exec" builtin?
5241 if (pf->pf_fd > 0 && fd == pf->pf_fd) {
5249 /* Check saved fds of redirects */
5250 fd |= COPYFD_RESTORE;
5251 for (i = 0; i < rp->pair_count; i++) {
5252 if (rp->two_fd[i].copy == fd) {
5260 * Process a list of redirection commands. If the REDIR_PUSH flag is set,
5261 * old file descriptors are stashed away so that the redirection can be
5262 * undone by calling popredir.
5264 /* flags passed to redirect */
5265 #define REDIR_PUSH 01 /* save previous values of file descriptors */
5266 #define REDIR_SAVEFD2 03 /* set preverrout */
5268 redirect(union node *redir, int flags)
5270 struct redirtab *sv;
5275 int copied_fd2 = -1;
5284 if (flags & REDIR_PUSH) {
5285 union node *tmp = redir;
5288 #if ENABLE_ASH_BASH_COMPAT
5289 if (tmp->nfile.type == NTO2)
5292 tmp = tmp->nfile.next;
5294 sv = ckmalloc(sizeof(*sv) + sv_pos * sizeof(sv->two_fd[0]));
5295 sv->next = redirlist;
5296 sv->pair_count = sv_pos;
5298 while (sv_pos > 0) {
5300 sv->two_fd[sv_pos].orig = sv->two_fd[sv_pos].copy = EMPTY;
5306 fd = redir->nfile.fd;
5307 if (redir->nfile.type == NTOFD || redir->nfile.type == NFROMFD) {
5308 right_fd = redir->ndup.dupfd;
5309 //bb_error_msg("doing %d > %d", fd, right_fd);
5310 /* redirect from/to same file descriptor? */
5313 /* "echo >&10" and 10 is a fd opened to a sh script? */
5314 if (is_hidden_fd(sv, right_fd)) {
5315 errno = EBADF; /* as if it is closed */
5316 ash_msg_and_raise_error("%d: %m", right_fd);
5320 newfd = openredirect(redir); /* always >= 0 */
5322 /* Descriptor wasn't open before redirect.
5323 * Mark it for close in the future */
5324 if (need_to_remember(sv, fd)) {
5325 goto remember_to_close;
5330 #if ENABLE_ASH_BASH_COMPAT
5333 if (need_to_remember(sv, fd)) {
5334 /* Copy old descriptor */
5335 /* Careful to not accidentally "save"
5336 * to the same fd as right side fd in N>&M */
5337 int minfd = right_fd < 10 ? 10 : right_fd + 1;
5338 i = fcntl(fd, F_DUPFD, minfd);
5339 /* You'd expect copy to be CLOEXECed. Currently these extra "saved" fds
5340 * are closed in popredir() in the child, preventing them from leaking
5341 * into child. (popredir() also cleans up the mess in case of failures)
5346 /* Strange error (e.g. "too many files" EMFILE?) */
5350 ash_msg_and_raise_error("%d: %m", fd);
5353 /* EBADF: it is not open - good, remember to close it */
5356 } else { /* fd is open, save its copy */
5357 /* "exec fd>&-" should not close fds
5358 * which point to script file(s).
5359 * Force them to be restored afterwards */
5360 if (is_hidden_fd(sv, fd))
5361 i |= COPYFD_RESTORE;
5365 sv->two_fd[sv_pos].orig = fd;
5366 sv->two_fd[sv_pos].copy = i;
5370 /* NTOFD/NFROMFD: copy redir->ndup.dupfd to fd */
5371 if (redir->ndup.dupfd < 0) { /* "fd>&-" */
5372 /* Don't want to trigger debugging */
5376 dup2_or_raise(redir->ndup.dupfd, fd);
5378 } else if (fd != newfd) { /* move newfd to fd */
5379 dup2_or_raise(newfd, fd);
5380 #if ENABLE_ASH_BASH_COMPAT
5381 if (!(redir->nfile.type == NTO2 && fd == 2))
5385 #if ENABLE_ASH_BASH_COMPAT
5386 if (redir->nfile.type == NTO2 && fd == 1) {
5387 /* We already redirected it to fd 1, now copy it to 2 */
5393 } while ((redir = redir->nfile.next) != NULL);
5396 if ((flags & REDIR_SAVEFD2) && copied_fd2 >= 0)
5397 preverrout_fd = copied_fd2;
5401 * Undo the effects of the last redirection.
5404 popredir(int drop, int restore)
5406 struct redirtab *rp;
5409 if (redirlist == NULL)
5413 for (i = 0; i < rp->pair_count; i++) {
5414 int fd = rp->two_fd[i].orig;
5415 int copy = rp->two_fd[i].copy;
5416 if (copy == CLOSED) {
5421 if (copy != EMPTY) {
5422 if (!drop || (restore && (copy & COPYFD_RESTORE))) {
5423 copy &= ~COPYFD_RESTORE;
5425 dup2_or_raise(copy, fd);
5427 close(copy & ~COPYFD_RESTORE);
5430 redirlist = rp->next;
5436 * Undo all redirections. Called on error or interrupt.
5440 redirectsafe(union node *redir, int flags)
5443 volatile int saveint;
5444 struct jmploc *volatile savehandler = exception_handler;
5445 struct jmploc jmploc;
5448 /* "echo 9>/dev/null; echo >&9; echo result: $?" - result should be 1, not 2! */
5449 err = setjmp(jmploc.loc); // huh?? was = setjmp(jmploc.loc) * 2;
5451 exception_handler = &jmploc;
5452 redirect(redir, flags);
5454 exception_handler = savehandler;
5455 if (err && exception_type != EXERROR)
5456 longjmp(exception_handler->loc, 1);
5457 RESTORE_INT(saveint);
5462 /* ============ Routines to expand arguments to commands
5464 * We have to deal with backquotes, shell variables, and file metacharacters.
5467 #if ENABLE_SH_MATH_SUPPORT
5469 ash_arith(const char *s)
5471 arith_state_t math_state;
5474 math_state.lookupvar = lookupvar;
5475 math_state.setvar = setvar0;
5476 //math_state.endofname = endofname;
5479 result = arith(&math_state, s);
5480 if (math_state.errmsg)
5481 ash_msg_and_raise_error(math_state.errmsg);
5491 #define EXP_FULL 0x1 /* perform word splitting & file globbing */
5492 #define EXP_TILDE 0x2 /* do normal tilde expansion */
5493 #define EXP_VARTILDE 0x4 /* expand tildes in an assignment */
5494 #define EXP_REDIR 0x8 /* file glob for a redirection (1 match only) */
5495 /* ^^^^^^^^^^^^^^ this is meant to support constructs such as "cmd >file*.txt"
5496 * POSIX says for this case:
5497 * Pathname expansion shall not be performed on the word by a
5498 * non-interactive shell; an interactive shell may perform it, but shall
5499 * do so only when the expansion would result in one word.
5500 * Currently, our code complies to the above rule by never globbing
5501 * redirection filenames.
5502 * Bash performs globbing, unless it is non-interactive and in POSIX mode.
5503 * (this means that on a typical Linux distro, bash almost always
5504 * performs globbing, and thus diverges from what we do).
5506 #define EXP_CASE 0x10 /* keeps quotes around for CASE pattern */
5507 #define EXP_QPAT 0x20 /* pattern in quoted parameter expansion */
5508 #define EXP_VARTILDE2 0x40 /* expand tildes after colons only */
5509 #define EXP_WORD 0x80 /* expand word in parameter expansion */
5510 #define EXP_QUOTED 0x100 /* expand word in double quotes */
5514 #define RMESCAPE_ALLOC 0x1 /* Allocate a new string */
5515 #define RMESCAPE_GLOB 0x2 /* Add backslashes for glob */
5516 #define RMESCAPE_GROW 0x8 /* Grow strings instead of stalloc */
5517 #define RMESCAPE_HEAP 0x10 /* Malloc strings instead of stalloc */
5518 #define RMESCAPE_SLASH 0x20 /* Stop globbing after slash */
5520 /* Add CTLESC when necessary. */
5521 #define QUOTES_ESC (EXP_FULL | EXP_CASE | EXP_QPAT | EXP_REDIR)
5522 /* Do not skip NUL characters. */
5523 #define QUOTES_KEEPNUL EXP_TILDE
5526 * Structure specifying which parts of the string should be searched
5527 * for IFS characters.
5530 struct ifsregion *next; /* next region in list */
5531 int begoff; /* offset of start of region */
5532 int endoff; /* offset of end of region */
5533 int nulonly; /* search for nul bytes only */
5537 struct strlist *list;
5538 struct strlist **lastp;
5541 /* output of current string */
5542 static char *expdest;
5543 /* list of back quote expressions */
5544 static struct nodelist *argbackq;
5545 /* first struct in list of ifs regions */
5546 static struct ifsregion ifsfirst;
5547 /* last struct in list */
5548 static struct ifsregion *ifslastp;
5549 /* holds expanded arg list */
5550 static struct arglist exparg;
5555 #if !ENABLE_SH_MATH_SUPPORT
5556 /* cvtnum() is used even if math support is off (to prepare $? values and such) */
5557 typedef long arith_t;
5558 # define ARITH_FMT "%ld"
5565 expdest = makestrspace(sizeof(arith_t)*3 + 2, expdest);
5566 len = fmtstr(expdest, sizeof(arith_t)*3 + 2, ARITH_FMT, num);
5567 STADJUST(len, expdest);
5572 esclen(const char *start, const char *p)
5576 while (p > start && (unsigned char)*--p == CTLESC) {
5583 * Remove any CTLESC characters from a string.
5586 rmescapes(char *str, int flag)
5588 static const char qchars[] ALIGN1 = {
5589 IF_ASH_BASH_COMPAT('/',) CTLESC, CTLQUOTEMARK, '\0' };
5593 unsigned protect_against_glob;
5595 IF_ASH_BASH_COMPAT(unsigned slash = flag & RMESCAPE_SLASH;)
5597 p = strpbrk(str, qchars IF_ASH_BASH_COMPAT(+ !slash));
5603 if (flag & RMESCAPE_ALLOC) {
5604 size_t len = p - str;
5605 size_t fulllen = len + strlen(p) + 1;
5607 if (flag & RMESCAPE_GROW) {
5608 int strloc = str - (char *)stackblock();
5609 r = makestrspace(fulllen, expdest);
5610 /* p and str may be invalidated by makestrspace */
5611 str = (char *)stackblock() + strloc;
5613 } else if (flag & RMESCAPE_HEAP) {
5614 r = ckmalloc(fulllen);
5616 r = stalloc(fulllen);
5620 q = (char *)memcpy(q, str, len) + len;
5625 globbing = flag & RMESCAPE_GLOB;
5626 protect_against_glob = globbing;
5628 if ((unsigned char)*p == CTLQUOTEMARK) {
5629 // Note: both inquotes and protect_against_glob only affect whether
5630 inquotes = ~inquotes;
5632 protect_against_glob = globbing;
5635 if ((unsigned char)*p == CTLESC) {
5639 ash_msg_and_raise_error("CTLESC at EOL (shouldn't happen)");
5641 if (protect_against_glob) {
5644 } else if (*p == '\\' && !inquotes) {
5645 /* naked back slash */
5646 protect_against_glob = 0;
5649 #if ENABLE_ASH_BASH_COMPAT
5650 else if (*p == '/' && slash) {
5651 /* stop handling globbing and mark location of slash */
5652 globbing = slash = 0;
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 flag)
5677 return rmescapes((char *)pattern, flag | RMESCAPE_GLOB);
5681 * Put a string on the stack.
5684 memtodest(const char *p, size_t len, int syntax, int quotes)
5691 q = makestrspace((quotes & QUOTES_ESC) ? len * 2 : len, expdest);
5694 unsigned char c = *p++;
5696 int n = SIT(c, syntax);
5697 if ((quotes & QUOTES_ESC)
5699 || (((quotes & EXP_FULL) || syntax != BASESYNTAX)
5705 } else if (!(quotes & QUOTES_KEEPNUL))
5714 strtodest(const char *p, int syntax, int quotes)
5716 size_t len = strlen(p);
5717 memtodest(p, len, syntax, quotes);
5722 * Record the fact that we have to scan this region of the
5723 * string for IFS characters.
5726 recordregion(int start, int end, int nulonly)
5728 struct ifsregion *ifsp;
5730 if (ifslastp == NULL) {
5734 ifsp = ckzalloc(sizeof(*ifsp));
5735 /*ifsp->next = NULL; - ckzalloc did it */
5736 ifslastp->next = ifsp;
5740 ifslastp->begoff = start;
5741 ifslastp->endoff = end;
5742 ifslastp->nulonly = nulonly;
5746 removerecordregions(int endoff)
5748 if (ifslastp == NULL)
5751 if (ifsfirst.endoff > endoff) {
5752 while (ifsfirst.next) {
5753 struct ifsregion *ifsp;
5755 ifsp = ifsfirst.next->next;
5756 free(ifsfirst.next);
5757 ifsfirst.next = ifsp;
5760 if (ifsfirst.begoff > endoff) {
5763 ifslastp = &ifsfirst;
5764 ifsfirst.endoff = endoff;
5769 ifslastp = &ifsfirst;
5770 while (ifslastp->next && ifslastp->next->begoff < endoff)
5771 ifslastp = ifslastp->next;
5772 while (ifslastp->next) {
5773 struct ifsregion *ifsp;
5775 ifsp = ifslastp->next->next;
5776 free(ifslastp->next);
5777 ifslastp->next = ifsp;
5780 if (ifslastp->endoff > endoff)
5781 ifslastp->endoff = endoff;
5785 exptilde(char *startp, char *p, int flags)
5791 int quotes = flags & QUOTES_ESC;
5795 while ((c = *++p) != '\0') {
5802 if (flags & EXP_VARTILDE)
5812 if (*name == '\0') {
5813 home = lookupvar("HOME");
5815 pw = getpwnam(name);
5820 if (!home || !*home)
5823 strtodest(home, SQSYNTAX, quotes);
5831 * Execute a command inside back quotes. If it's a builtin command, we
5832 * want to save its output in a block obtained from malloc. Otherwise
5833 * we fork off a subprocess and get the output of the command via a pipe.
5834 * Should be called with interrupts off.
5836 struct backcmd { /* result of evalbackcmd */
5837 int fd; /* file descriptor to read from */
5838 int nleft; /* number of chars in buffer */
5839 char *buf; /* buffer */
5840 struct job *jp; /* job structure for command */
5843 /* These forward decls are needed to use "eval" code for backticks handling: */
5844 #define EV_EXIT 01 /* exit after evaluating tree */
5845 static int evaltree(union node *, int);
5847 static void FAST_FUNC
5848 evalbackcmd(union node *n, struct backcmd *result)
5862 ash_msg_and_raise_error("pipe call failed");
5863 jp = makejob(/*n,*/ 1);
5864 if (forkshell(jp, n, FORK_NOJOB) == 0) {
5869 dup2_or_raise(pip[1], 1);
5872 /* TODO: eflag clearing makes the following not abort:
5873 * ash -c 'set -e; z=$(false;echo foo); echo $z'
5874 * which is what bash does (unless it is in POSIX mode).
5875 * dash deleted "eflag = 0" line in the commit
5876 * Date: Mon, 28 Jun 2010 17:11:58 +1000
5877 * [EVAL] Don't clear eflag in evalbackcmd
5878 * For now, preserve bash-like behavior, it seems to be somewhat more useful:
5881 evaltree(n, EV_EXIT); /* actually evaltreenr... */
5885 result->fd = pip[0];
5889 TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n",
5890 result->fd, result->buf, result->nleft, result->jp));
5894 * Expand stuff in backwards quotes.
5897 expbackq(union node *cmd, int flag)
5905 int syntax = flag & EXP_QUOTED ? DQSYNTAX : BASESYNTAX;
5906 struct stackmark smark;
5909 startloc = expdest - (char *)stackblock();
5910 pushstackmark(&smark, startloc);
5911 evalbackcmd(cmd, &in);
5912 popstackmark(&smark);
5919 memtodest(p, i, syntax, flag & QUOTES_ESC);
5923 i = nonblock_immune_read(in.fd, buf, sizeof(buf));
5924 TRACE(("expbackq: read returns %d\n", i));
5933 back_exitstatus = waitforjob(in.jp);
5937 /* Eat all trailing newlines */
5939 for (; dest > (char *)stackblock() && dest[-1] == '\n';)
5943 if (!(flag & EXP_QUOTED))
5944 recordregion(startloc, dest - (char *)stackblock(), 0);
5945 TRACE(("evalbackq: size:%d:'%.*s'\n",
5946 (int)((dest - (char *)stackblock()) - startloc),
5947 (int)((dest - (char *)stackblock()) - startloc),
5948 stackblock() + startloc));
5951 #if ENABLE_SH_MATH_SUPPORT
5953 * Expand arithmetic expression. Backup to start of expression,
5954 * evaluate, place result in (backed up) result, adjust string position.
5966 * This routine is slightly over-complicated for
5967 * efficiency. Next we scan backwards looking for the
5968 * start of arithmetic.
5970 start = stackblock();
5977 while ((unsigned char)*p != CTLARI) {
5981 ash_msg_and_raise_error("missing CTLARI (shouldn't happen)");
5986 esc = esclen(start, p);
5996 removerecordregions(begoff);
6000 if (flag & QUOTES_ESC)
6001 rmescapes(p + 1, 0);
6003 len = cvtnum(ash_arith(p + 1));
6005 if (!(flag & EXP_QUOTED))
6006 recordregion(begoff, begoff + len, 0);
6010 /* argstr needs it */
6011 static char *evalvar(char *p, int flags, struct strlist *var_str_list);
6014 * Perform variable and command substitution. If EXP_FULL is set, output CTLESC
6015 * characters to allow for further processing. Otherwise treat
6016 * $@ like $* since no splitting will be performed.
6018 * var_str_list (can be NULL) is a list of "VAR=val" strings which take precedence
6019 * over shell varables. Needed for "A=a B=$A; echo $B" case - we use it
6020 * for correct expansion of "B=$A" word.
6023 argstr(char *p, int flags, struct strlist *var_str_list)
6025 static const char spclchars[] ALIGN1 = {
6033 #if ENABLE_SH_MATH_SUPPORT
6038 const char *reject = spclchars;
6039 int breakall = (flags & (EXP_WORD | EXP_QUOTED)) == EXP_WORD;
6044 if (!(flags & EXP_VARTILDE)) {
6046 } else if (flags & EXP_VARTILDE2) {
6051 if (flags & EXP_TILDE) {
6054 flags &= ~EXP_TILDE;
6058 p = exptilde(p, q, flags);
6061 startloc = expdest - (char *)stackblock();
6065 length += strcspn(p + length, reject);
6069 IF_SH_MATH_SUPPORT(|| c == CTLENDARI)
6071 /* c == '=' || c == ':' || c == CTLENDARI */
6077 expdest = stack_nputstr(p, length, expdest);
6078 newloc = expdest - (char *)stackblock();
6079 if (breakall && !inquotes && newloc > startloc) {
6080 recordregion(startloc, newloc, 0);
6091 if (flags & EXP_VARTILDE2) {
6095 flags |= EXP_VARTILDE2;
6100 * sort of a hack - expand tildes in variable
6101 * assignments (after the first '=' and after ':'s).
6110 case CTLENDVAR: /* ??? */
6113 inquotes ^= EXP_QUOTED;
6114 /* "$@" syntax adherence hack */
6115 if (inquotes && !memcmp(p, dolatstr + 1, DOLATSTRLEN - 1)) {
6116 p = evalvar(p + 1, flags | inquotes, /* var_str_list: */ NULL) + 1;
6120 if (flags & QUOTES_ESC) {
6131 * Quoted parameter expansion pattern: remove quote
6132 * unless inside inner quotes or we have a literal
6135 if (((flags | inquotes) & (EXP_QPAT | EXP_QUOTED)) ==
6136 EXP_QPAT && *p != '\\')
6141 TRACE(("argstr: evalvar('%s')\n", p));
6142 p = evalvar(p, flags | inquotes, var_str_list);
6143 TRACE(("argstr: evalvar:'%s'\n", (char *)stackblock()));
6146 expbackq(argbackq->n, flags | inquotes);
6147 argbackq = argbackq->next;
6149 #if ENABLE_SH_MATH_SUPPORT
6152 expari(flags | inquotes);
6161 scanleft(char *startp, char *rmesc, char *rmescend UNUSED_PARAM,
6162 char *pattern, int quotes, int zero)
6171 const char *s = loc2;
6178 match = pmatch(pattern, s);
6183 if (quotes && (unsigned char)*loc == CTLESC)
6192 scanright(char *startp, char *rmesc, char *rmescend,
6193 char *pattern, int quotes, int match_at_start)
6195 #if !ENABLE_ASH_OPTIMIZE_FOR_SIZE
6196 int try2optimize = match_at_start;
6202 /* If we called by "${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);
6283 subevalvar(char *p, char *varname, int strloc, int subtype,
6284 int startloc, int varflags, int flag, struct strlist *var_str_list)
6286 struct nodelist *saveargbackq = argbackq;
6287 int quotes = flag & QUOTES_ESC;
6290 char *rmesc, *rmescend;
6292 IF_ASH_BASH_COMPAT(char *repl = NULL;)
6293 IF_ASH_BASH_COMPAT(int pos, len, orig_len;)
6294 int amount, resetloc;
6295 IF_ASH_BASH_COMPAT(int workloc;)
6297 char *(*scan)(char*, char*, char*, char*, int, int);
6299 //bb_error_msg("subevalvar(p:'%s',varname:'%s',strloc:%d,subtype:%d,startloc:%d,varflags:%x,quotes:%d)",
6300 // p, varname, strloc, subtype, startloc, varflags, quotes);
6302 argstr(p, EXP_TILDE | (subtype != VSASSIGN && subtype != VSQUESTION ?
6303 (flag & (EXP_QUOTED | EXP_QPAT) ? EXP_QPAT : EXP_CASE) : 0),
6305 STPUTC('\0', expdest);
6306 argbackq = saveargbackq;
6307 startp = (char *)stackblock() + startloc;
6311 setvar0(varname, startp);
6312 amount = startp - expdest;
6313 STADJUST(amount, expdest);
6317 varunset(p, varname, startp, varflags);
6320 #if ENABLE_ASH_BASH_COMPAT
6322 //TODO: support more general format ${v:EXPR:EXPR},
6323 // where EXPR follows $(()) rules
6324 loc = str = stackblock() + strloc;
6325 /* Read POS in ${var:POS:LEN} */
6326 pos = atoi(loc); /* number(loc) errors out on "1:4" */
6327 len = str - startp - 1;
6329 /* *loc != '\0', guaranteed by parser */
6333 /* Adjust the length by the number of escapes */
6334 for (ptr = startp; ptr < (str - 1); ptr++) {
6335 if ((unsigned char)*ptr == CTLESC) {
6343 if (*loc++ == ':') {
6347 /* Skip POS in ${var:POS:LEN} */
6349 while (*loc && *loc != ':') {
6351 * bash complains on: var=qwe; echo ${var:1a:123}
6353 ash_msg_and_raise_error(msg_illnum, str);
6357 if (*loc++ == ':') {
6362 /* ${VAR:$((-n)):l} starts n chars from the end */
6363 pos = orig_len + pos;
6365 if ((unsigned)pos >= orig_len) {
6366 /* apart from obvious ${VAR:999999:l},
6367 * covers ${VAR:$((-9999999)):l} - result is ""
6373 if (len > (orig_len - pos))
6374 len = orig_len - pos;
6376 for (str = startp; pos; str++, pos--) {
6377 if (quotes && (unsigned char)*str == CTLESC)
6380 for (loc = startp; len; len--) {
6381 if (quotes && (unsigned char)*str == CTLESC)
6386 amount = loc - expdest;
6387 STADJUST(amount, expdest);
6392 resetloc = expdest - (char *)stackblock();
6394 /* We'll comeback here if we grow the stack while handling
6395 * a VSREPLACE or VSREPLACEALL, since our pointers into the
6396 * stack will need rebasing, and we'll need to remove our work
6399 IF_ASH_BASH_COMPAT(restart:)
6401 amount = expdest - ((char *)stackblock() + resetloc);
6402 STADJUST(-amount, expdest);
6403 startp = (char *)stackblock() + startloc;
6406 rmescend = (char *)stackblock() + strloc;
6408 rmesc = rmescapes(startp, RMESCAPE_ALLOC | RMESCAPE_GROW);
6409 if (rmesc != startp) {
6411 startp = (char *)stackblock() + startloc;
6415 str = (char *)stackblock() + strloc;
6417 * Example: v='a\bc'; echo ${v/\\b/_\\_\z_}
6418 * The result is a_\_z_c (not a\_\_z_c)!
6420 * The search pattern and replace string treat backslashes differently!
6421 * RMESCAPE_SLASH causes preglob to work differently on the pattern
6422 * and string. It's only used on the first call.
6424 preglob(str, IF_ASH_BASH_COMPAT(
6425 (subtype == VSREPLACE || subtype == VSREPLACEALL) && !repl ?
6426 RMESCAPE_SLASH :) 0);
6428 #if ENABLE_ASH_BASH_COMPAT
6429 workloc = expdest - (char *)stackblock();
6430 if (subtype == VSREPLACE || subtype == VSREPLACEALL) {
6434 repl = strchr(str, CTLESC);
6440 //bb_error_msg("str:'%s' repl:'%s'", str, repl);
6442 /* If there's no pattern to match, return the expansion unmolested */
6451 loc = scanright(idx, rmesc, rmescend, str, quotes, 1);
6452 //bb_error_msg("scanright('%s'):'%s'", str, loc);
6454 /* No match, advance */
6455 char *restart_detect = stackblock();
6457 STPUTC(*idx, expdest);
6458 if (quotes && (unsigned char)*idx == CTLESC) {
6461 STPUTC(*idx, expdest);
6463 if (stackblock() != restart_detect)
6468 /* continue; - prone to quadratic behavior, smarter code: */
6471 if (str[0] == '*') {
6472 /* Pattern is "*foo". If "*foo" does not match "long_string",
6473 * it would never match "ong_string" etc, no point in trying.
6480 if (subtype == VSREPLACEALL) {
6482 if (quotes && (unsigned char)*idx == CTLESC)
6491 //bb_error_msg("repl:'%s'", repl);
6492 for (loc = (char*)repl; *loc; loc++) {
6493 char *restart_detect = stackblock();
6494 if (quotes && *loc == '\\') {
6495 STPUTC(CTLESC, expdest);
6498 STPUTC(*loc, expdest);
6499 if (stackblock() != restart_detect)
6504 if (subtype == VSREPLACE) {
6505 //bb_error_msg("tail:'%s', quotes:%x", idx, quotes);
6507 char *restart_detect = stackblock();
6508 STPUTC(*idx, expdest);
6509 if (stackblock() != restart_detect)
6518 /* We've put the replaced text into a buffer at workloc, now
6519 * move it to the right place and adjust the stack.
6521 STPUTC('\0', expdest);
6522 startp = (char *)stackblock() + startloc;
6523 memmove(startp, (char *)stackblock() + workloc, len + 1);
6524 //bb_error_msg("startp:'%s'", startp);
6525 amount = expdest - (startp + len);
6526 STADJUST(-amount, expdest);
6529 #endif /* ENABLE_ASH_BASH_COMPAT */
6531 subtype -= VSTRIMRIGHT;
6533 if (subtype < 0 || subtype > 7)
6536 /* zero = (subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX) */
6537 zero = subtype >> 1;
6538 /* VSTRIMLEFT/VSTRIMRIGHTMAX -> scanleft */
6539 scan = (subtype & 1) ^ zero ? scanleft : scanright;
6541 loc = scan(startp, rmesc, rmescend, str, quotes, zero);
6544 memmove(startp, loc, str - loc);
6545 loc = startp + (str - loc) - 1;
6548 amount = loc - expdest;
6549 STADJUST(amount, expdest);
6555 * Add the value of a specialized variable to the stack string.
6556 * name parameter (examples):
6557 * ash -c 'echo $1' name:'1='
6558 * ash -c 'echo $qwe' name:'qwe='
6559 * ash -c 'echo $$' name:'$='
6560 * ash -c 'echo ${$}' name:'$='
6561 * ash -c 'echo ${$##q}' name:'$=q'
6562 * ash -c 'echo ${#$}' name:'$='
6563 * note: examples with bad shell syntax:
6564 * ash -c 'echo ${#$1}' name:'$=1'
6565 * ash -c 'echo ${#1#}' name:'1=#'
6567 static NOINLINE ssize_t
6568 varvalue(char *name, int varflags, int flags, struct strlist *var_str_list, int *quotedp)
6575 int quoted = *quotedp;
6576 int subtype = varflags & VSTYPE;
6577 int discard = subtype == VSPLUS || subtype == VSLENGTH;
6578 int quotes = (discard ? 0 : (flags & QUOTES_ESC)) | QUOTES_KEEPNUL;
6581 sep = (flags & EXP_FULL) << CHAR_BIT;
6582 syntax = quoted ? DQSYNTAX : BASESYNTAX;
6592 num = shellparam.nparam;
6600 goto check_1char_name;
6602 expdest = makestrspace(NOPTS, expdest);
6603 for (i = NOPTS - 1; i >= 0; i--) {
6605 USTPUTC(optletters(i), expdest);
6611 /* handles cases similar to ${#$1} */
6612 if (name[2] != '\0')
6613 raise_error_syntax("bad substitution");
6626 sep |= ifsset() ? ifsval()[0] : ' ';
6633 while ((p = *ap++) != NULL) {
6634 len += strtodest(p, syntax, quotes);
6638 memtodest(&sepc, 1, syntax, quotes);
6653 num = atoi(name); /* number(name) fails on ${N#str} etc */
6654 if (num < 0 || num > shellparam.nparam)
6656 p = num ? shellparam.p[num - 1] : arg0;
6659 /* NB: name has form "VAR=..." */
6661 /* "A=a B=$A" case: var_str_list is a list of "A=a" strings
6662 * which should be considered before we check variables. */
6664 unsigned name_len = (strchrnul(name, '=') - name) + 1;
6668 str = var_str_list->text;
6669 eq = strchr(str, '=');
6670 if (!eq) /* stop at first non-assignment */
6673 if (name_len == (unsigned)(eq - str)
6674 && strncmp(str, name, name_len) == 0
6677 /* goto value; - WRONG! */
6678 /* think "A=1 A=2 B=$A" */
6680 var_str_list = var_str_list->next;
6681 } while (var_str_list);
6685 p = lookupvar(name);
6690 len = strtodest(p, syntax, quotes);
6691 #if ENABLE_UNICODE_SUPPORT
6692 if (subtype == VSLENGTH && len > 0) {
6693 reinit_unicode_for_ash();
6694 if (unicode_status == UNICODE_ON) {
6695 STADJUST(-len, expdest);
6697 len = unicode_strlen(p);
6705 STADJUST(-len, expdest);
6710 * Expand a variable, and return a pointer to the next character in the
6714 evalvar(char *p, int flag, struct strlist *var_str_list)
6725 varflags = (unsigned char) *p++;
6726 subtype = varflags & VSTYPE;
6729 raise_error_syntax("bad substitution");
6731 quoted = flag & EXP_QUOTED;
6733 easy = (!quoted || (*var == '@' && shellparam.nparam));
6734 startloc = expdest - (char *)stackblock();
6735 p = strchr(p, '=') + 1; //TODO: use var_end(p)?
6738 varlen = varvalue(var, varflags, flag, var_str_list, "ed);
6739 if (varflags & VSNUL)
6742 if (subtype == VSPLUS) {
6743 varlen = -1 - varlen;
6747 if (subtype == VSMINUS) {
6752 flag | EXP_TILDE | EXP_WORD,
6760 if (subtype == VSASSIGN || subtype == VSQUESTION) {
6764 subevalvar(p, var, 0, subtype, startloc, varflags,
6765 flag & ~QUOTES_ESC, var_str_list);
6768 * Remove any recorded regions beyond
6771 removerecordregions(startloc);
6775 if (varlen < 0 && uflag)
6776 varunset(p, var, 0, 0);
6778 if (subtype == VSLENGTH) {
6779 cvtnum(varlen > 0 ? varlen : 0);
6783 if (subtype == VSNORMAL) {
6787 recordregion(startloc, expdest - (char *)stackblock(), quoted);
6796 case VSTRIMRIGHTMAX:
6797 #if ENABLE_ASH_BASH_COMPAT
6810 * Terminate the string and start recording the pattern
6813 STPUTC('\0', expdest);
6814 patloc = expdest - (char *)stackblock();
6815 if (NULL == subevalvar(p, /* varname: */ NULL, patloc, subtype,
6816 startloc, varflags, flag, var_str_list)) {
6817 int amount = expdest - (
6818 (char *)stackblock() + patloc - 1
6820 STADJUST(-amount, expdest);
6822 /* Remove any recorded regions beyond start of variable */
6823 removerecordregions(startloc);
6828 if (subtype != VSNORMAL) { /* skip to end of alternative */
6831 unsigned char c = *p++;
6834 else if (c == CTLBACKQ) {
6836 argbackq = argbackq->next;
6837 } else if (c == CTLVAR) {
6838 if ((*p++ & VSTYPE) != VSNORMAL)
6840 } else if (c == CTLENDVAR) {
6850 * Break the argument string into pieces based upon IFS and add the
6851 * strings to the argument list. The regions of the string to be
6852 * searched for IFS characters have been stored by recordregion.
6855 ifsbreakup(char *string, struct arglist *arglist)
6857 struct ifsregion *ifsp;
6862 const char *ifs, *realifs;
6867 if (ifslastp != NULL) {
6870 realifs = ifsset() ? ifsval() : defifs;
6873 p = string + ifsp->begoff;
6874 nulonly = ifsp->nulonly;
6875 ifs = nulonly ? nullstr : realifs;
6877 while (p < string + ifsp->endoff) {
6879 if ((unsigned char)*p == CTLESC)
6881 if (!strchr(ifs, *p)) {
6886 ifsspc = (strchr(defifs, *p) != NULL);
6887 /* Ignore IFS whitespace at start */
6888 if (q == start && ifsspc) {
6894 sp = stzalloc(sizeof(*sp));
6896 *arglist->lastp = sp;
6897 arglist->lastp = &sp->next;
6901 if (p >= string + ifsp->endoff) {
6905 if ((unsigned char)*p == CTLESC)
6907 if (strchr(ifs, *p) == NULL) {
6911 if (strchr(defifs, *p) == NULL) {
6926 } while (ifsp != NULL);
6935 sp = stzalloc(sizeof(*sp));
6937 *arglist->lastp = sp;
6938 arglist->lastp = &sp->next;
6944 struct ifsregion *p;
6949 struct ifsregion *ifsp;
6955 ifsfirst.next = NULL;
6960 * Add a file name to the list.
6963 addfname(const char *name)
6967 sp = stzalloc(sizeof(*sp));
6968 sp->text = sstrdup(name);
6970 exparg.lastp = &sp->next;
6973 /* If we want to use glob() from libc... */
6974 #if !ENABLE_ASH_INTERNAL_GLOB
6976 /* Add the result of glob() to the list */
6978 addglob(const glob_t *pglob)
6980 char **p = pglob->gl_pathv;
6987 expandmeta(struct strlist *str /*, int flag*/)
6989 /* TODO - EXP_REDIR */
6999 p = preglob(str->text, RMESCAPE_ALLOC | RMESCAPE_HEAP);
7000 // GLOB_NOMAGIC (GNU): if no *?[ chars in pattern, return it even if no match
7001 // GLOB_NOCHECK: if no match, return unchanged pattern (sans \* escapes?)
7003 // glibc 2.24.90 glob(GLOB_NOMAGIC) does not remove backslashes used for escaping:
7004 // if you pass it "file\?", it returns "file\?", not "file?", if no match.
7005 // Which means you need to unescape the string, right? Not so fast:
7006 // if there _is_ a file named "file\?" (with backslash), it is returned
7007 // as "file\?" too (whichever pattern you used to find it, say, "file*").
7008 // You DONT KNOW by looking at the result whether you need to unescape it.
7010 // Worse, globbing of "file\?" in a directory with two files, "file?" and "file\?",
7011 // returns "file\?" - which is WRONG: "file\?" pattern matches "file?" file.
7012 // Without GLOB_NOMAGIC, this works correctly ("file?" is returned as a match).
7013 // With GLOB_NOMAGIC | GLOB_NOCHECK, this also works correctly.
7014 // i = glob(p, GLOB_NOMAGIC | GLOB_NOCHECK, NULL, &pglob);
7015 // i = glob(p, GLOB_NOMAGIC, NULL, &pglob);
7016 i = glob(p, 0, NULL, &pglob);
7017 //bb_error_msg("glob('%s'):%d '%s'...", p, i, pglob.gl_pathv ? pglob.gl_pathv[0] : "-");
7022 #if 0 // glibc 2.24.90 bug? Patterns like "*/file", when match, don't set GLOB_MAGCHAR
7023 /* GLOB_MAGCHAR is set if *?[ chars were seen (GNU) */
7024 if (!(pglob.gl_flags & GLOB_MAGCHAR))
7036 *exparg.lastp = str;
7037 rmescapes(str->text, 0);
7038 exparg.lastp = &str->next;
7040 default: /* GLOB_NOSPACE */
7043 ash_msg_and_raise_error(bb_msg_memory_exhausted);
7050 /* ENABLE_ASH_INTERNAL_GLOB: Homegrown globbing code. (dash also has both, uses homegrown one.) */
7053 * Do metacharacter (i.e. *, ?, [...]) expansion.
7056 expmeta(char *expdir, char *enddir, char *name)
7072 for (p = name; esc = 0, *p; p += esc + 1) {
7073 if (*p == '*' || *p == '?')
7075 else if (*p == '[') {
7082 if (*q == '/' || *q == '\0')
7092 if (p[esc] == '/') {
7095 start = p + esc + 1;
7099 if (metaflag == 0) { /* we've reached the end of the file name */
7100 if (enddir != expdir)
7108 if (metaflag == 0 || lstat(expdir, &statb) >= 0)
7119 } while (p < start);
7121 if (enddir == expdir) {
7123 } else if (enddir == expdir + 1 && *expdir == '/') {
7132 if (enddir != expdir)
7134 if (*endname == 0) {
7147 while (!pending_int && (dp = readdir(dirp)) != NULL) {
7148 if (dp->d_name[0] == '.' && !matchdot)
7150 if (pmatch(start, dp->d_name)) {
7152 strcpy(enddir, dp->d_name);
7155 for (p = enddir, cp = dp->d_name; (*p++ = *cp++) != '\0';)
7158 expmeta(expdir, p, endname);
7164 endname[-esc - 1] = esc ? '\\' : '/';
7167 static struct strlist *
7168 msort(struct strlist *list, int len)
7170 struct strlist *p, *q = NULL;
7171 struct strlist **lpp;
7179 for (n = half; --n >= 0;) {
7183 q->next = NULL; /* terminate first half of list */
7184 q = msort(list, half); /* sort first half of list */
7185 p = msort(p, len - half); /* sort second half */
7188 #if ENABLE_LOCALE_SUPPORT
7189 if (strcoll(p->text, q->text) < 0)
7191 if (strcmp(p->text, q->text) < 0)
7215 * Sort the results of file name expansion. It calculates the number of
7216 * strings to sort and then calls msort (short for merge sort) to do the
7219 static struct strlist *
7220 expsort(struct strlist *str)
7226 for (sp = str; sp; sp = sp->next)
7228 return msort(str, len);
7232 expandmeta(struct strlist *str /*, int flag*/)
7234 static const char metachars[] ALIGN1 = {
7237 /* TODO - EXP_REDIR */
7241 struct strlist **savelastp;
7247 if (!strpbrk(str->text, metachars))
7249 savelastp = exparg.lastp;
7252 p = preglob(str->text, RMESCAPE_ALLOC | RMESCAPE_HEAP);
7254 int i = strlen(str->text);
7255 //BUGGY estimation of how long expanded name can be
7256 expdir = ckmalloc(i < 2048 ? 2048 : i+1);
7258 expmeta(expdir, expdir, p);
7263 if (exparg.lastp == savelastp) {
7268 *exparg.lastp = str;
7269 rmescapes(str->text, 0);
7270 exparg.lastp = &str->next;
7272 *exparg.lastp = NULL;
7273 *savelastp = sp = expsort(*savelastp);
7274 while (sp->next != NULL)
7276 exparg.lastp = &sp->next;
7281 #endif /* ENABLE_ASH_INTERNAL_GLOB */
7284 * Perform variable substitution and command substitution on an argument,
7285 * placing the resulting list of arguments in arglist. If EXP_FULL is true,
7286 * perform splitting and file name expansion. When arglist is NULL, perform
7287 * here document expansion.
7290 expandarg(union node *arg, struct arglist *arglist, int flag)
7295 argbackq = arg->narg.backquote;
7296 STARTSTACKSTR(expdest);
7297 ifsfirst.next = NULL;
7299 TRACE(("expandarg: argstr('%s',flags:%x)\n", arg->narg.text, flag));
7300 argstr(arg->narg.text, flag,
7301 /* var_str_list: */ arglist ? arglist->list : NULL);
7302 p = _STPUTC('\0', expdest);
7304 if (arglist == NULL) {
7305 return; /* here document expanded */
7307 p = grabstackstr(p);
7308 TRACE(("expandarg: p:'%s'\n", p));
7309 exparg.lastp = &exparg.list;
7313 if (flag & EXP_FULL) {
7314 ifsbreakup(p, &exparg);
7315 *exparg.lastp = NULL;
7316 exparg.lastp = &exparg.list;
7317 expandmeta(exparg.list /*, flag*/);
7319 if (flag & EXP_REDIR) { /*XXX - for now, just remove escapes */
7321 TRACE(("expandarg: rmescapes:'%s'\n", p));
7323 sp = stzalloc(sizeof(*sp));
7326 exparg.lastp = &sp->next;
7330 *exparg.lastp = NULL;
7332 *arglist->lastp = exparg.list;
7333 arglist->lastp = exparg.lastp;
7338 * Expand shell variables and backquotes inside a here document.
7341 expandhere(union node *arg, int fd)
7343 expandarg(arg, (struct arglist *)NULL, EXP_QUOTED);
7344 full_write(fd, stackblock(), expdest - (char *)stackblock());
7348 * Returns true if the pattern matches the string.
7351 patmatch(char *pattern, const char *string)
7353 return pmatch(preglob(pattern, 0), string);
7357 * See if a pattern matches in a case statement.
7360 casematch(union node *pattern, char *val)
7362 struct stackmark smark;
7365 setstackmark(&smark);
7366 argbackq = pattern->narg.backquote;
7367 STARTSTACKSTR(expdest);
7369 argstr(pattern->narg.text, EXP_TILDE | EXP_CASE,
7370 /* var_str_list: */ NULL);
7371 STACKSTRNUL(expdest);
7372 result = patmatch(stackblock(), val);
7373 popstackmark(&smark);
7378 /* ============ find_command */
7382 int (*builtin)(int, char **) FAST_FUNC;
7383 /* unsigned flags; */
7385 #define IS_BUILTIN_SPECIAL(b) ((b)->name[0] & 1)
7386 /* "regular" builtins always take precedence over commands,
7387 * regardless of PATH=....%builtin... position */
7388 #define IS_BUILTIN_REGULAR(b) ((b)->name[0] & 2)
7389 #define IS_BUILTIN_ASSIGN(b) ((b)->name[0] & 4)
7392 smallint cmdtype; /* CMDxxx */
7395 /* index >= 0 for commands without path (slashes) */
7396 /* (TODO: what exactly does the value mean? PATH position?) */
7397 /* index == -1 for commands with slashes */
7398 /* index == (-2 - applet_no) for NOFORK applets */
7399 const struct builtincmd *cmd;
7400 struct funcnode *func;
7403 /* values of cmdtype */
7404 #define CMDUNKNOWN -1 /* no entry in table for command */
7405 #define CMDNORMAL 0 /* command is an executable program */
7406 #define CMDFUNCTION 1 /* command is a shell function */
7407 #define CMDBUILTIN 2 /* command is a shell builtin */
7409 /* action to find_command() */
7410 #define DO_ERR 0x01 /* prints errors */
7411 #define DO_ABS 0x02 /* checks absolute paths */
7412 #define DO_NOFUNC 0x04 /* don't return shell functions, for command */
7413 #define DO_ALTPATH 0x08 /* using alternate path */
7414 #define DO_ALTBLTIN 0x20 /* %builtin in alt. path */
7416 static void find_command(char *, struct cmdentry *, int, const char *);
7419 /* ============ Hashing commands */
7422 * When commands are first encountered, they are entered in a hash table.
7423 * This ensures that a full path search will not have to be done for them
7424 * on each invocation.
7426 * We should investigate converting to a linear search, even though that
7427 * would make the command name "hash" a misnomer.
7431 struct tblentry *next; /* next entry in hash chain */
7432 union param param; /* definition of builtin function */
7433 smallint cmdtype; /* CMDxxx */
7434 char rehash; /* if set, cd done since entry created */
7435 char cmdname[1]; /* name of command */
7438 static struct tblentry **cmdtable;
7439 #define INIT_G_cmdtable() do { \
7440 cmdtable = xzalloc(CMDTABLESIZE * sizeof(cmdtable[0])); \
7443 static int builtinloc = -1; /* index in path of %builtin, or -1 */
7447 tryexec(IF_FEATURE_SH_STANDALONE(int applet_no,) char *cmd, char **argv, char **envp)
7449 #if ENABLE_FEATURE_SH_STANDALONE
7450 if (applet_no >= 0) {
7451 if (APPLET_IS_NOEXEC(applet_no)) {
7455 run_applet_no_and_exit(applet_no, argv);
7457 /* re-exec ourselves with the new arguments */
7458 execve(bb_busybox_exec_path, argv, envp);
7459 /* If they called chroot or otherwise made the binary no longer
7460 * executable, fall through */
7467 execve(cmd, argv, envp);
7468 } while (errno == EINTR);
7470 execve(cmd, argv, envp);
7472 if (cmd == (char*) bb_busybox_exec_path) {
7473 /* We already visited ENOEXEC branch below, don't do it again */
7474 //TODO: try execve(initial_argv0_of_shell, argv, envp) before giving up?
7478 if (errno == ENOEXEC) {
7479 /* Run "cmd" as a shell script:
7480 * http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html
7481 * "If the execve() function fails with ENOEXEC, the shell
7482 * shall execute a command equivalent to having a shell invoked
7483 * with the command name as its first operand,
7484 * with any remaining arguments passed to the new shell"
7486 * That is, do not use $SHELL, user's shell, or /bin/sh;
7487 * just call ourselves.
7489 * Note that bash reads ~80 chars of the file, and if it sees
7490 * a zero byte before it sees newline, it doesn't try to
7491 * interpret it, but fails with "cannot execute binary file"
7492 * message and exit code 126. For one, this prevents attempts
7493 * to interpret foreign ELF binaries as shell scripts.
7498 for (ap = argv; *ap; ap++)
7500 new = ckmalloc((ap - argv + 2) * sizeof(new[0]));
7501 new[0] = (char*) "ash";
7504 while ((*ap++ = *++argv) != NULL)
7506 cmd = (char*) bb_busybox_exec_path;
7513 * Exec a program. Never returns. If you change this routine, you may
7514 * have to change the find_command routine as well.
7516 static void shellexec(char **, const char *, int) NORETURN;
7518 shellexec(char **argv, const char *path, int idx)
7524 int applet_no = -1; /* used only by FEATURE_SH_STANDALONE */
7526 envp = listvars(VEXPORT, VUNSET, /*end:*/ NULL);
7527 if (strchr(argv[0], '/') != NULL
7528 #if ENABLE_FEATURE_SH_STANDALONE
7529 || (applet_no = find_applet_by_name(argv[0])) >= 0
7532 tryexec(IF_FEATURE_SH_STANDALONE(applet_no,) argv[0], argv, envp);
7533 if (applet_no >= 0) {
7534 /* We tried execing ourself, but it didn't work.
7535 * Maybe /proc/self/exe doesn't exist?
7544 while ((cmdname = path_advance(&path, argv[0])) != NULL) {
7545 if (--idx < 0 && pathopt == NULL) {
7546 tryexec(IF_FEATURE_SH_STANDALONE(-1,) cmdname, argv, envp);
7547 if (errno != ENOENT && errno != ENOTDIR)
7554 /* Map to POSIX errors */
7566 exitstatus = exerrno;
7567 TRACE(("shellexec failed for %s, errno %d, suppress_int %d\n",
7568 argv[0], e, suppress_int));
7569 ash_msg_and_raise(EXEXIT, "%s: %s", argv[0], errmsg(e, "not found"));
7574 printentry(struct tblentry *cmdp)
7580 idx = cmdp->param.index;
7583 name = path_advance(&path, cmdp->cmdname);
7585 } while (--idx >= 0);
7586 out1fmt("%s%s\n", name, (cmdp->rehash ? "*" : nullstr));
7590 * Clear out command entries. The argument specifies the first entry in
7591 * PATH which has changed.
7594 clearcmdentry(int firstchange)
7596 struct tblentry **tblp;
7597 struct tblentry **pp;
7598 struct tblentry *cmdp;
7601 for (tblp = cmdtable; tblp < &cmdtable[CMDTABLESIZE]; tblp++) {
7603 while ((cmdp = *pp) != NULL) {
7604 if ((cmdp->cmdtype == CMDNORMAL &&
7605 cmdp->param.index >= firstchange)
7606 || (cmdp->cmdtype == CMDBUILTIN &&
7607 builtinloc >= firstchange)
7620 * Locate a command in the command hash table. If "add" is nonzero,
7621 * add the command to the table if it is not already present. The
7622 * variable "lastcmdentry" is set to point to the address of the link
7623 * pointing to the entry, so that delete_cmd_entry can delete the
7626 * Interrupts must be off if called with add != 0.
7628 static struct tblentry **lastcmdentry;
7630 static struct tblentry *
7631 cmdlookup(const char *name, int add)
7633 unsigned int hashval;
7635 struct tblentry *cmdp;
7636 struct tblentry **pp;
7639 hashval = (unsigned char)*p << 4;
7641 hashval += (unsigned char)*p++;
7643 pp = &cmdtable[hashval % CMDTABLESIZE];
7644 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7645 if (strcmp(cmdp->cmdname, name) == 0)
7649 if (add && cmdp == NULL) {
7650 cmdp = *pp = ckzalloc(sizeof(struct tblentry)
7652 /* + 1 - already done because
7653 * tblentry::cmdname is char[1] */);
7654 /*cmdp->next = NULL; - ckzalloc did it */
7655 cmdp->cmdtype = CMDUNKNOWN;
7656 strcpy(cmdp->cmdname, name);
7663 * Delete the command entry returned on the last lookup.
7666 delete_cmd_entry(void)
7668 struct tblentry *cmdp;
7671 cmdp = *lastcmdentry;
7672 *lastcmdentry = cmdp->next;
7673 if (cmdp->cmdtype == CMDFUNCTION)
7674 freefunc(cmdp->param.func);
7680 * Add a new command entry, replacing any existing command entry for
7681 * the same name - except special builtins.
7684 addcmdentry(char *name, struct cmdentry *entry)
7686 struct tblentry *cmdp;
7688 cmdp = cmdlookup(name, 1);
7689 if (cmdp->cmdtype == CMDFUNCTION) {
7690 freefunc(cmdp->param.func);
7692 cmdp->cmdtype = entry->cmdtype;
7693 cmdp->param = entry->u;
7697 static int FAST_FUNC
7698 hashcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
7700 struct tblentry **pp;
7701 struct tblentry *cmdp;
7703 struct cmdentry entry;
7706 if (nextopt("r") != '\0') {
7711 if (*argptr == NULL) {
7712 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
7713 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7714 if (cmdp->cmdtype == CMDNORMAL)
7722 while ((name = *argptr) != NULL) {
7723 cmdp = cmdlookup(name, 0);
7725 && (cmdp->cmdtype == CMDNORMAL
7726 || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))
7730 find_command(name, &entry, DO_ERR, pathval());
7731 if (entry.cmdtype == CMDUNKNOWN)
7739 * Called when a cd is done. Marks all commands so the next time they
7740 * are executed they will be rehashed.
7745 struct tblentry **pp;
7746 struct tblentry *cmdp;
7748 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
7749 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7750 if (cmdp->cmdtype == CMDNORMAL
7751 || (cmdp->cmdtype == CMDBUILTIN
7752 && !IS_BUILTIN_REGULAR(cmdp->param.cmd)
7762 * Fix command hash table when PATH changed.
7763 * Called before PATH is changed. The argument is the new value of PATH;
7764 * pathval() still returns the old value at this point.
7765 * Called with interrupts off.
7767 static void FAST_FUNC
7768 changepath(const char *new)
7776 firstchange = 9999; /* assume no change */
7782 if ((*old == '\0' && *new == ':')
7783 || (*old == ':' && *new == '\0')
7787 old = new; /* ignore subsequent differences */
7791 if (*new == '%' && idx_bltin < 0 && prefix(new + 1, "builtin"))
7798 if (builtinloc < 0 && idx_bltin >= 0)
7799 builtinloc = idx_bltin; /* zap builtins */
7800 if (builtinloc >= 0 && idx_bltin < 0)
7802 clearcmdentry(firstchange);
7803 builtinloc = idx_bltin;
7828 #if ENABLE_ASH_BASH_COMPAT
7839 typedef smallint token_id_t;
7841 /* Nth bit indicates if token marks the end of a list */
7844 /* 0 */ | (1u << TEOF)
7845 /* 1 */ | (0u << TNL)
7846 /* 2 */ | (0u << TREDIR)
7847 /* 3 */ | (0u << TWORD)
7848 /* 4 */ | (0u << TSEMI)
7849 /* 5 */ | (0u << TBACKGND)
7850 /* 6 */ | (0u << TAND)
7851 /* 7 */ | (0u << TOR)
7852 /* 8 */ | (0u << TPIPE)
7853 /* 9 */ | (0u << TLP)
7854 /* 10 */ | (1u << TRP)
7855 /* 11 */ | (1u << TENDCASE)
7856 /* 12 */ | (1u << TENDBQUOTE)
7857 /* 13 */ | (0u << TNOT)
7858 /* 14 */ | (0u << TCASE)
7859 /* 15 */ | (1u << TDO)
7860 /* 16 */ | (1u << TDONE)
7861 /* 17 */ | (1u << TELIF)
7862 /* 18 */ | (1u << TELSE)
7863 /* 19 */ | (1u << TESAC)
7864 /* 20 */ | (1u << TFI)
7865 /* 21 */ | (0u << TFOR)
7866 #if ENABLE_ASH_BASH_COMPAT
7867 /* 22 */ | (0u << TFUNCTION)
7869 /* 23 */ | (0u << TIF)
7870 /* 24 */ | (0u << TIN)
7871 /* 25 */ | (1u << TTHEN)
7872 /* 26 */ | (0u << TUNTIL)
7873 /* 27 */ | (0u << TWHILE)
7874 /* 28 */ | (0u << TBEGIN)
7875 /* 29 */ | (1u << TEND)
7876 , /* thus far 29 bits used */
7879 static const char *const tokname_array[] = {
7893 #define KWDOFFSET 13
7894 /* the following are keywords */
7904 #if ENABLE_ASH_BASH_COMPAT
7916 /* Wrapper around strcmp for qsort/bsearch/... */
7918 pstrcmp(const void *a, const void *b)
7920 return strcmp((char*)a, *(char**)b);
7923 static const char *const *
7924 findkwd(const char *s)
7926 return bsearch(s, tokname_array + KWDOFFSET,
7927 ARRAY_SIZE(tokname_array) - KWDOFFSET,
7928 sizeof(tokname_array[0]), pstrcmp);
7932 * Locate and print what a word is...
7935 describe_command(char *command, const char *path, int describe_command_verbose)
7937 struct cmdentry entry;
7938 struct tblentry *cmdp;
7939 #if ENABLE_ASH_ALIAS
7940 const struct alias *ap;
7943 path = path ? path : pathval();
7945 if (describe_command_verbose) {
7949 /* First look at the keywords */
7950 if (findkwd(command)) {
7951 out1str(describe_command_verbose ? " is a shell keyword" : command);
7955 #if ENABLE_ASH_ALIAS
7956 /* Then look at the aliases */
7957 ap = lookupalias(command, 0);
7959 if (!describe_command_verbose) {
7964 out1fmt(" is an alias for %s", ap->val);
7968 /* Then check if it is a tracked alias */
7969 cmdp = cmdlookup(command, 0);
7971 entry.cmdtype = cmdp->cmdtype;
7972 entry.u = cmdp->param;
7974 /* Finally use brute force */
7975 find_command(command, &entry, DO_ABS, path);
7978 switch (entry.cmdtype) {
7980 int j = entry.u.index;
7986 p = path_advance(&path, command);
7990 if (describe_command_verbose) {
7992 (cmdp ? " a tracked alias for" : nullstr), p
8001 if (describe_command_verbose) {
8002 out1str(" is a shell function");
8009 if (describe_command_verbose) {
8010 out1fmt(" is a %sshell builtin",
8011 IS_BUILTIN_SPECIAL(entry.u.cmd) ?
8012 "special " : nullstr
8020 if (describe_command_verbose) {
8021 out1str(": not found\n");
8030 static int FAST_FUNC
8031 typecmd(int argc UNUSED_PARAM, char **argv)
8037 /* type -p ... ? (we don't bother checking for 'p') */
8038 if (argv[1] && argv[1][0] == '-') {
8043 err |= describe_command(argv[i++], NULL, verbose);
8048 #if ENABLE_ASH_CMDCMD
8049 /* Is it "command [-p] PROG ARGS" bltin, no other opts? Return ptr to "PROG" if yes */
8051 parse_command_args(char **argv, const char **path)
8064 if (c == '-' && !*cp) {
8072 *path = bb_default_path;
8075 /* run 'typecmd' for other options */
8084 static int FAST_FUNC
8085 commandcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
8093 const char *path = NULL;
8095 /* "command [-p] PROG ARGS" (that is, without -V or -v)
8096 * never reaches this function.
8099 while ((c = nextopt("pvV")) != '\0')
8101 verify |= VERIFY_VERBOSE;
8103 /*verify |= VERIFY_BRIEF*/;
8109 path = bb_default_path;
8111 /* Mimic bash: just "command -v" doesn't complain, it's a nop */
8113 if (/*verify && */ cmd)
8114 return describe_command(cmd, path, verify /* - VERIFY_BRIEF*/);
8121 /*static int funcblocksize; // size of structures in function */
8122 /*static int funcstringsize; // size of strings in node */
8123 static void *funcblock; /* block to allocate function from */
8124 static char *funcstring_end; /* end of block to allocate strings from */
8126 /* flags in argument to evaltree */
8127 #define EV_EXIT 01 /* exit after evaluating tree */
8128 #define EV_TESTED 02 /* exit status is checked; ignore -e flag */
8130 static const uint8_t nodesize[N_NUMBER] ALIGN1 = {
8131 [NCMD ] = SHELL_ALIGN(sizeof(struct ncmd)),
8132 [NPIPE ] = SHELL_ALIGN(sizeof(struct npipe)),
8133 [NREDIR ] = SHELL_ALIGN(sizeof(struct nredir)),
8134 [NBACKGND ] = SHELL_ALIGN(sizeof(struct nredir)),
8135 [NSUBSHELL] = SHELL_ALIGN(sizeof(struct nredir)),
8136 [NAND ] = SHELL_ALIGN(sizeof(struct nbinary)),
8137 [NOR ] = SHELL_ALIGN(sizeof(struct nbinary)),
8138 [NSEMI ] = SHELL_ALIGN(sizeof(struct nbinary)),
8139 [NIF ] = SHELL_ALIGN(sizeof(struct nif)),
8140 [NWHILE ] = SHELL_ALIGN(sizeof(struct nbinary)),
8141 [NUNTIL ] = SHELL_ALIGN(sizeof(struct nbinary)),
8142 [NFOR ] = SHELL_ALIGN(sizeof(struct nfor)),
8143 [NCASE ] = SHELL_ALIGN(sizeof(struct ncase)),
8144 [NCLIST ] = SHELL_ALIGN(sizeof(struct nclist)),
8145 [NDEFUN ] = SHELL_ALIGN(sizeof(struct narg)),
8146 [NARG ] = SHELL_ALIGN(sizeof(struct narg)),
8147 [NTO ] = SHELL_ALIGN(sizeof(struct nfile)),
8148 #if ENABLE_ASH_BASH_COMPAT
8149 [NTO2 ] = SHELL_ALIGN(sizeof(struct nfile)),
8151 [NCLOBBER ] = SHELL_ALIGN(sizeof(struct nfile)),
8152 [NFROM ] = SHELL_ALIGN(sizeof(struct nfile)),
8153 [NFROMTO ] = SHELL_ALIGN(sizeof(struct nfile)),
8154 [NAPPEND ] = SHELL_ALIGN(sizeof(struct nfile)),
8155 [NTOFD ] = SHELL_ALIGN(sizeof(struct ndup)),
8156 [NFROMFD ] = SHELL_ALIGN(sizeof(struct ndup)),
8157 [NHERE ] = SHELL_ALIGN(sizeof(struct nhere)),
8158 [NXHERE ] = SHELL_ALIGN(sizeof(struct nhere)),
8159 [NNOT ] = SHELL_ALIGN(sizeof(struct nnot)),
8162 static int calcsize(int funcblocksize, union node *n);
8165 sizenodelist(int funcblocksize, struct nodelist *lp)
8168 funcblocksize += SHELL_ALIGN(sizeof(struct nodelist));
8169 funcblocksize = calcsize(funcblocksize, lp->n);
8172 return funcblocksize;
8176 calcsize(int funcblocksize, union node *n)
8179 return funcblocksize;
8180 funcblocksize += nodesize[n->type];
8183 funcblocksize = calcsize(funcblocksize, n->ncmd.redirect);
8184 funcblocksize = calcsize(funcblocksize, n->ncmd.args);
8185 funcblocksize = calcsize(funcblocksize, n->ncmd.assign);
8188 funcblocksize = sizenodelist(funcblocksize, n->npipe.cmdlist);
8193 funcblocksize = calcsize(funcblocksize, n->nredir.redirect);
8194 funcblocksize = calcsize(funcblocksize, n->nredir.n);
8201 funcblocksize = calcsize(funcblocksize, n->nbinary.ch2);
8202 funcblocksize = calcsize(funcblocksize, n->nbinary.ch1);
8205 funcblocksize = calcsize(funcblocksize, n->nif.elsepart);
8206 funcblocksize = calcsize(funcblocksize, n->nif.ifpart);
8207 funcblocksize = calcsize(funcblocksize, n->nif.test);
8210 funcblocksize += SHELL_ALIGN(strlen(n->nfor.var) + 1); /* was funcstringsize += ... */
8211 funcblocksize = calcsize(funcblocksize, n->nfor.body);
8212 funcblocksize = calcsize(funcblocksize, n->nfor.args);
8215 funcblocksize = calcsize(funcblocksize, n->ncase.cases);
8216 funcblocksize = calcsize(funcblocksize, n->ncase.expr);
8219 funcblocksize = calcsize(funcblocksize, n->nclist.body);
8220 funcblocksize = calcsize(funcblocksize, n->nclist.pattern);
8221 funcblocksize = calcsize(funcblocksize, n->nclist.next);
8225 funcblocksize = sizenodelist(funcblocksize, n->narg.backquote);
8226 funcblocksize += SHELL_ALIGN(strlen(n->narg.text) + 1); /* was funcstringsize += ... */
8227 funcblocksize = calcsize(funcblocksize, n->narg.next);
8230 #if ENABLE_ASH_BASH_COMPAT
8237 funcblocksize = calcsize(funcblocksize, n->nfile.fname);
8238 funcblocksize = calcsize(funcblocksize, n->nfile.next);
8242 funcblocksize = calcsize(funcblocksize, n->ndup.vname);
8243 funcblocksize = calcsize(funcblocksize, n->ndup.next);
8247 funcblocksize = calcsize(funcblocksize, n->nhere.doc);
8248 funcblocksize = calcsize(funcblocksize, n->nhere.next);
8251 funcblocksize = calcsize(funcblocksize, n->nnot.com);
8254 return funcblocksize;
8258 nodeckstrdup(char *s)
8260 funcstring_end -= SHELL_ALIGN(strlen(s) + 1);
8261 return strcpy(funcstring_end, s);
8264 static union node *copynode(union node *);
8266 static struct nodelist *
8267 copynodelist(struct nodelist *lp)
8269 struct nodelist *start;
8270 struct nodelist **lpp;
8275 funcblock = (char *) funcblock + SHELL_ALIGN(sizeof(struct nodelist));
8276 (*lpp)->n = copynode(lp->n);
8278 lpp = &(*lpp)->next;
8285 copynode(union node *n)
8292 funcblock = (char *) funcblock + nodesize[n->type];
8296 new->ncmd.redirect = copynode(n->ncmd.redirect);
8297 new->ncmd.args = copynode(n->ncmd.args);
8298 new->ncmd.assign = copynode(n->ncmd.assign);
8301 new->npipe.cmdlist = copynodelist(n->npipe.cmdlist);
8302 new->npipe.pipe_backgnd = n->npipe.pipe_backgnd;
8307 new->nredir.redirect = copynode(n->nredir.redirect);
8308 new->nredir.n = copynode(n->nredir.n);
8315 new->nbinary.ch2 = copynode(n->nbinary.ch2);
8316 new->nbinary.ch1 = copynode(n->nbinary.ch1);
8319 new->nif.elsepart = copynode(n->nif.elsepart);
8320 new->nif.ifpart = copynode(n->nif.ifpart);
8321 new->nif.test = copynode(n->nif.test);
8324 new->nfor.var = nodeckstrdup(n->nfor.var);
8325 new->nfor.body = copynode(n->nfor.body);
8326 new->nfor.args = copynode(n->nfor.args);
8329 new->ncase.cases = copynode(n->ncase.cases);
8330 new->ncase.expr = copynode(n->ncase.expr);
8333 new->nclist.body = copynode(n->nclist.body);
8334 new->nclist.pattern = copynode(n->nclist.pattern);
8335 new->nclist.next = copynode(n->nclist.next);
8339 new->narg.backquote = copynodelist(n->narg.backquote);
8340 new->narg.text = nodeckstrdup(n->narg.text);
8341 new->narg.next = copynode(n->narg.next);
8344 #if ENABLE_ASH_BASH_COMPAT
8351 new->nfile.fname = copynode(n->nfile.fname);
8352 new->nfile.fd = n->nfile.fd;
8353 new->nfile.next = copynode(n->nfile.next);
8357 new->ndup.vname = copynode(n->ndup.vname);
8358 new->ndup.dupfd = n->ndup.dupfd;
8359 new->ndup.fd = n->ndup.fd;
8360 new->ndup.next = copynode(n->ndup.next);
8364 new->nhere.doc = copynode(n->nhere.doc);
8365 new->nhere.fd = n->nhere.fd;
8366 new->nhere.next = copynode(n->nhere.next);
8369 new->nnot.com = copynode(n->nnot.com);
8372 new->type = n->type;
8377 * Make a copy of a parse tree.
8379 static struct funcnode *
8380 copyfunc(union node *n)
8385 /*funcstringsize = 0;*/
8386 blocksize = offsetof(struct funcnode, n) + calcsize(0, n);
8387 f = ckzalloc(blocksize /* + funcstringsize */);
8388 funcblock = (char *) f + offsetof(struct funcnode, n);
8389 funcstring_end = (char *) f + blocksize;
8391 /* f->count = 0; - ckzalloc did it */
8396 * Define a shell function.
8399 defun(union node *func)
8401 struct cmdentry entry;
8404 entry.cmdtype = CMDFUNCTION;
8405 entry.u.func = copyfunc(func);
8406 addcmdentry(func->narg.text, &entry);
8410 /* Reasons for skipping commands (see comment on breakcmd routine) */
8411 #define SKIPBREAK (1 << 0)
8412 #define SKIPCONT (1 << 1)
8413 #define SKIPFUNC (1 << 2)
8414 static smallint evalskip; /* set to SKIPxxx if we are skipping commands */
8415 static int skipcount; /* number of levels to skip */
8416 static int funcnest; /* depth of function calls */
8417 static int loopnest; /* current loop nesting level */
8419 /* Forward decl way out to parsing code - dotrap needs it */
8420 static int evalstring(char *s, int flags);
8422 /* Called to execute a trap.
8423 * Single callsite - at the end of evaltree().
8424 * If we return non-zero, evaltree raises EXEXIT exception.
8426 * Perhaps we should avoid entering new trap handlers
8427 * while we are executing a trap handler. [is it a TODO?]
8434 uint8_t last_status;
8439 last_status = exitstatus;
8443 TRACE(("dotrap entered\n"));
8444 for (sig = 1, g = gotsig; sig < NSIG; sig++, g++) {
8456 /* non-trapped SIGINT is handled separately by raise_interrupt,
8457 * don't upset it by resetting gotsig[SIGINT-1] */
8458 if (sig == SIGINT && !p)
8461 TRACE(("sig %d is active, will run handler '%s'\n", sig, p));
8467 exitstatus = last_status;
8468 TRACE(("dotrap returns\n"));
8471 /* forward declarations - evaluation is fairly recursive business... */
8472 static int evalloop(union node *, int);
8473 static int evalfor(union node *, int);
8474 static int evalcase(union node *, int);
8475 static int evalsubshell(union node *, int);
8476 static void expredir(union node *);
8477 static int evalpipe(union node *, int);
8478 static int evalcommand(union node *, int);
8479 static int evalbltin(const struct builtincmd *, int, char **, int);
8480 static void prehash(union node *);
8483 * Evaluate a parse tree. The value is left in the global variable
8487 evaltree(union node *n, int flags)
8489 struct jmploc *volatile savehandler = exception_handler;
8490 struct jmploc jmploc;
8492 int (*evalfn)(union node *, int);
8496 SAVE_INT(int_level);
8499 TRACE(("evaltree(NULL) called\n"));
8502 TRACE(("evaltree(%p: %d, %d) called\n", n, n->type, flags));
8506 exception_handler = &jmploc;
8508 int err = setjmp(jmploc.loc);
8510 /* if it was a signal, check for trap handlers */
8511 if (exception_type == EXSIG) {
8512 TRACE(("exception %d (EXSIG) in evaltree, err=%d\n",
8513 exception_type, err));
8516 /* continue on the way out */
8517 TRACE(("exception %d in evaltree, propagating err=%d\n",
8518 exception_type, err));
8519 exception_handler = savehandler;
8520 longjmp(exception_handler->loc, err);
8527 out1fmt("Node type = %d\n", n->type);
8532 status = !evaltree(n->nnot.com, EV_TESTED);
8535 expredir(n->nredir.redirect);
8536 status = redirectsafe(n->nredir.redirect, REDIR_PUSH);
8538 status = evaltree(n->nredir.n, flags & EV_TESTED);
8540 if (n->nredir.redirect)
8541 popredir(/*drop:*/ 0, /*restore:*/ 0 /* not sure */);
8544 evalfn = evalcommand;
8546 if (eflag && !(flags & EV_TESTED))
8558 evalfn = evalsubshell;
8571 #error NAND + 1 != NOR
8573 #if NOR + 1 != NSEMI
8574 #error NOR + 1 != NSEMI
8576 unsigned is_or = n->type - NAND;
8579 (flags | ((is_or >> 1) - 1)) & EV_TESTED
8581 if ((!status) == is_or || evalskip)
8587 status = evalfn(n, flags);
8591 status = evaltree(n->nif.test, EV_TESTED);
8598 if (n->nif.elsepart) {
8599 n = n->nif.elsepart;
8606 /* Not necessary. To test it:
8607 * "false; f() { qwerty; }; echo $?" should print 0.
8611 exitstatus = status;
8616 exception_handler = savehandler;
8619 /* Order of checks below is important:
8620 * signal handlers trigger before exit caused by "set -e".
8624 if (checkexit & status)
8625 raise_exception(EXEXIT);
8626 if (flags & EV_EXIT)
8627 raise_exception(EXEXIT);
8629 RESTORE_INT(int_level);
8630 TRACE(("leaving evaltree (no interrupts)\n"));
8635 #if !defined(__alpha__) || (defined(__GNUC__) && __GNUC__ >= 3)
8638 int evaltreenr(union node *, int) __attribute__ ((alias("evaltree"),__noreturn__));
8643 int skip = evalskip;
8650 if (--skipcount <= 0) {
8661 evalloop(union node *n, int flags)
8672 i = evaltree(n->nbinary.ch1, EV_TESTED);
8674 if (skip == SKIPFUNC)
8678 if (n->type != NWHILE)
8682 status = evaltree(n->nbinary.ch2, flags);
8684 } while (!(skip & ~SKIPCONT));
8691 evalfor(union node *n, int flags)
8693 struct arglist arglist;
8696 struct stackmark smark;
8699 setstackmark(&smark);
8700 arglist.list = NULL;
8701 arglist.lastp = &arglist.list;
8702 for (argp = n->nfor.args; argp; argp = argp->narg.next) {
8703 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
8705 *arglist.lastp = NULL;
8709 for (sp = arglist.list; sp; sp = sp->next) {
8710 setvar0(n->nfor.var, sp->text);
8711 status = evaltree(n->nfor.body, flags);
8712 if (skiploop() & ~SKIPCONT)
8716 popstackmark(&smark);
8722 evalcase(union node *n, int flags)
8726 struct arglist arglist;
8727 struct stackmark smark;
8730 setstackmark(&smark);
8731 arglist.list = NULL;
8732 arglist.lastp = &arglist.list;
8733 expandarg(n->ncase.expr, &arglist, EXP_TILDE);
8734 for (cp = n->ncase.cases; cp && evalskip == 0; cp = cp->nclist.next) {
8735 for (patp = cp->nclist.pattern; patp; patp = patp->narg.next) {
8736 if (casematch(patp, arglist.list->text)) {
8737 /* Ensure body is non-empty as otherwise
8738 * EV_EXIT may prevent us from setting the
8741 if (evalskip == 0 && cp->nclist.body) {
8742 status = evaltree(cp->nclist.body, flags);
8749 popstackmark(&smark);
8755 * Kick off a subshell to evaluate a tree.
8758 evalsubshell(union node *n, int flags)
8761 int backgnd = (n->type == NBACKGND);
8764 expredir(n->nredir.redirect);
8765 if (!backgnd && (flags & EV_EXIT) && !may_have_traps)
8768 jp = makejob(/*n,*/ 1);
8769 if (forkshell(jp, n, backgnd) == 0) {
8774 flags &= ~EV_TESTED;
8776 redirect(n->nredir.redirect, 0);
8777 evaltreenr(n->nredir.n, flags);
8782 status = waitforjob(jp);
8788 * Compute the names of the files in a redirection list.
8790 static void fixredir(union node *, const char *, int);
8792 expredir(union node *n)
8796 for (redir = n; redir; redir = redir->nfile.next) {
8800 fn.lastp = &fn.list;
8801 switch (redir->type) {
8805 #if ENABLE_ASH_BASH_COMPAT
8810 expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR);
8811 TRACE(("expredir expanded to '%s'\n", fn.list->text));
8812 #if ENABLE_ASH_BASH_COMPAT
8816 // By the design of stack allocator, the loop of this kind:
8817 // while true; do while true; do break; done </dev/null; done
8818 // will look like a memory leak: ash plans to free expfname's
8819 // of "/dev/null" as soon as it finishes running the loop
8820 // (in this case, never).
8821 // This "fix" is wrong:
8822 if (redir->nfile.expfname)
8823 stunalloc(redir->nfile.expfname);
8824 // It results in corrupted state of stacked allocations.
8826 redir->nfile.expfname = fn.list->text;
8829 case NTOFD: /* >& */
8830 if (redir->ndup.vname) {
8831 expandarg(redir->ndup.vname, &fn, EXP_FULL | EXP_TILDE);
8832 if (fn.list == NULL)
8833 ash_msg_and_raise_error("redir error");
8834 #if ENABLE_ASH_BASH_COMPAT
8835 //FIXME: we used expandarg with different args!
8836 if (!isdigit_str9(fn.list->text)) {
8837 /* >&file, not >&fd */
8838 if (redir->nfile.fd != 1) /* 123>&file - BAD */
8839 ash_msg_and_raise_error("redir error");
8841 goto store_expfname;
8844 fixredir(redir, fn.list->text, 1);
8852 * Evaluate a pipeline. All the processes in the pipeline are children
8853 * of the process creating the pipeline. (This differs from some versions
8854 * of the shell, which make the last process in a pipeline the parent
8858 evalpipe(union node *n, int flags)
8861 struct nodelist *lp;
8867 TRACE(("evalpipe(0x%lx) called\n", (long)n));
8869 for (lp = n->npipe.cmdlist; lp; lp = lp->next)
8873 jp = makejob(/*n,*/ pipelen);
8875 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
8879 if (pipe(pip) < 0) {
8881 ash_msg_and_raise_error("pipe call failed");
8884 if (forkshell(jp, lp->n, n->npipe.pipe_backgnd) == 0) {
8897 evaltreenr(lp->n, flags);
8903 /* Don't want to trigger debugging */
8907 if (n->npipe.pipe_backgnd == 0) {
8908 status = waitforjob(jp);
8909 TRACE(("evalpipe: job done exit status %d\n", status));
8917 * Controls whether the shell is interactive or not.
8920 setinteractive(int on)
8922 static smallint is_interactive;
8924 if (++on == is_interactive)
8926 is_interactive = on;
8930 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
8931 if (is_interactive > 1) {
8932 /* Looks like they want an interactive shell */
8933 static smallint did_banner;
8936 /* note: ash and hush share this string */
8937 out1fmt("\n\n%s %s\n"
8938 IF_ASH_HELP("Enter 'help' for a list of built-in commands.\n")
8941 "built-in shell (ash)"
8955 setinteractive(iflag);
8957 #if ENABLE_FEATURE_EDITING_VI
8959 line_input_state->flags |= VI_MODE;
8961 line_input_state->flags &= ~VI_MODE;
8963 viflag = 0; /* forcibly keep the option off */
8967 static struct localvar *localvars;
8970 * Called after a function returns.
8971 * Interrupts must be off.
8976 struct localvar *lvp;
8979 while ((lvp = localvars) != NULL) {
8980 localvars = lvp->next;
8982 TRACE(("poplocalvar %s\n", vp ? vp->var_text : "-"));
8983 if (vp == NULL) { /* $- saved */
8984 memcpy(optlist, lvp->text, sizeof(optlist));
8985 free((char*)lvp->text);
8987 } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) {
8988 unsetvar(vp->var_text);
8991 vp->var_func(var_end(lvp->text));
8992 if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
8993 free((char*)vp->var_text);
8994 vp->flags = lvp->flags;
8995 vp->var_text = lvp->text;
9002 evalfun(struct funcnode *func, int argc, char **argv, int flags)
9004 volatile struct shparam saveparam;
9005 struct localvar *volatile savelocalvars;
9006 struct jmploc *volatile savehandler;
9007 struct jmploc jmploc;
9010 saveparam = shellparam;
9011 savelocalvars = localvars;
9012 savehandler = exception_handler;
9013 e = setjmp(jmploc.loc);
9018 exception_handler = &jmploc;
9020 shellparam.malloced = 0;
9024 shellparam.nparam = argc - 1;
9025 shellparam.p = argv + 1;
9026 #if ENABLE_ASH_GETOPTS
9027 shellparam.optind = 1;
9028 shellparam.optoff = -1;
9030 evaltree(func->n.narg.next, flags & EV_TESTED);
9036 localvars = savelocalvars;
9037 freeparam(&shellparam);
9038 shellparam = saveparam;
9039 exception_handler = savehandler;
9041 evalskip &= ~SKIPFUNC;
9046 * Make a variable a local variable. When a variable is made local, it's
9047 * value and flags are saved in a localvar structure. The saved values
9048 * will be restored when the shell function returns. We handle the name
9049 * "-" as a special case: it makes changes to "set +-options" local
9050 * (options will be restored on return from the function).
9055 struct localvar *lvp;
9058 char *eq = strchr(name, '=');
9061 /* Cater for duplicate "local". Examples:
9062 * x=0; f() { local x=1; echo $x; local x; echo $x; }; f; echo $x
9063 * x=0; f() { local x=1; echo $x; local x=2; echo $x; }; f; echo $x
9067 if (lvp->vp && varcmp(lvp->vp->var_text, name) == 0) {
9071 * it's a duplicate "local VAR" declaration, do nothing
9078 lvp = ckzalloc(sizeof(*lvp));
9079 if (LONE_DASH(name)) {
9081 p = ckmalloc(sizeof(optlist));
9082 lvp->text = memcpy(p, optlist, sizeof(optlist));
9085 vpp = hashvar(name);
9086 vp = *findvar(vpp, name);
9088 /* variable did not exist yet */
9090 setvareq(name, VSTRFIXED);
9092 setvar(name, NULL, VSTRFIXED);
9093 vp = *vpp; /* the new variable */
9094 lvp->flags = VUNSET;
9096 lvp->text = vp->var_text;
9097 lvp->flags = vp->flags;
9098 /* make sure neither "struct var" nor string gets freed
9099 * during (un)setting:
9101 vp->flags |= VSTRFIXED|VTEXTFIXED;
9105 /* "local VAR" unsets VAR: */
9106 setvar0(name, NULL);
9110 lvp->next = localvars;
9116 * The "local" command.
9118 static int FAST_FUNC
9119 localcmd(int argc UNUSED_PARAM, char **argv)
9124 ash_msg_and_raise_error("not in a function");
9127 while ((name = *argv++) != NULL) {
9133 static int FAST_FUNC
9134 falsecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
9139 static int FAST_FUNC
9140 truecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
9145 static int FAST_FUNC
9146 execcmd(int argc UNUSED_PARAM, char **argv)
9149 iflag = 0; /* exit on error */
9152 /* We should set up signals for "exec CMD"
9153 * the same way as for "CMD" without "exec".
9154 * But optschanged->setinteractive->setsignal
9155 * still thought we are a root shell. Therefore, for example,
9156 * SIGQUIT is still set to IGN. Fix it:
9160 /*setsignal(SIGTERM); - unnecessary because of iflag=0 */
9161 /*setsignal(SIGTSTP); - unnecessary because of mflag=0 */
9162 /*setsignal(SIGTTOU); - unnecessary because of mflag=0 */
9164 shellexec(argv + 1, pathval(), 0);
9171 * The return command.
9173 static int FAST_FUNC
9174 returncmd(int argc UNUSED_PARAM, char **argv)
9177 * If called outside a function, do what ksh does;
9178 * skip the rest of the file.
9180 evalskip = SKIPFUNC;
9181 return argv[1] ? number(argv[1]) : exitstatus;
9184 /* Forward declarations for builtintab[] */
9185 static int breakcmd(int, char **) FAST_FUNC;
9186 static int dotcmd(int, char **) FAST_FUNC;
9187 static int evalcmd(int, char **, int) FAST_FUNC;
9188 static int exitcmd(int, char **) FAST_FUNC;
9189 static int exportcmd(int, char **) FAST_FUNC;
9190 #if ENABLE_ASH_GETOPTS
9191 static int getoptscmd(int, char **) FAST_FUNC;
9194 static int helpcmd(int, char **) FAST_FUNC;
9197 static int historycmd(int, char **) FAST_FUNC;
9199 #if ENABLE_SH_MATH_SUPPORT
9200 static int letcmd(int, char **) FAST_FUNC;
9202 static int readcmd(int, char **) FAST_FUNC;
9203 static int setcmd(int, char **) FAST_FUNC;
9204 static int shiftcmd(int, char **) FAST_FUNC;
9205 static int timescmd(int, char **) FAST_FUNC;
9206 static int trapcmd(int, char **) FAST_FUNC;
9207 static int umaskcmd(int, char **) FAST_FUNC;
9208 static int unsetcmd(int, char **) FAST_FUNC;
9209 static int ulimitcmd(int, char **) FAST_FUNC;
9211 #define BUILTIN_NOSPEC "0"
9212 #define BUILTIN_SPECIAL "1"
9213 #define BUILTIN_REGULAR "2"
9214 #define BUILTIN_SPEC_REG "3"
9215 #define BUILTIN_ASSIGN "4"
9216 #define BUILTIN_SPEC_ASSG "5"
9217 #define BUILTIN_REG_ASSG "6"
9218 #define BUILTIN_SPEC_REG_ASSG "7"
9220 /* Stubs for calling non-FAST_FUNC's */
9221 #if ENABLE_ASH_BUILTIN_ECHO
9222 static int FAST_FUNC echocmd(int argc, char **argv) { return echo_main(argc, argv); }
9224 #if ENABLE_ASH_BUILTIN_PRINTF
9225 static int FAST_FUNC printfcmd(int argc, char **argv) { return printf_main(argc, argv); }
9227 #if ENABLE_ASH_BUILTIN_TEST
9228 static int FAST_FUNC testcmd(int argc, char **argv) { return test_main(argc, argv); }
9231 /* Keep these in proper order since it is searched via bsearch() */
9232 static const struct builtincmd builtintab[] = {
9233 { BUILTIN_SPEC_REG "." , dotcmd },
9234 { BUILTIN_SPEC_REG ":" , truecmd },
9235 #if ENABLE_ASH_BUILTIN_TEST
9236 { BUILTIN_REGULAR "[" , testcmd },
9237 #if ENABLE_ASH_BASH_COMPAT
9238 { BUILTIN_REGULAR "[[" , testcmd },
9241 #if ENABLE_ASH_ALIAS
9242 { BUILTIN_REG_ASSG "alias" , aliascmd },
9245 { BUILTIN_REGULAR "bg" , fg_bgcmd },
9247 { BUILTIN_SPEC_REG "break" , breakcmd },
9248 { BUILTIN_REGULAR "cd" , cdcmd },
9249 { BUILTIN_NOSPEC "chdir" , cdcmd },
9250 #if ENABLE_ASH_CMDCMD
9251 { BUILTIN_REGULAR "command" , commandcmd },
9253 { BUILTIN_SPEC_REG "continue", breakcmd },
9254 #if ENABLE_ASH_BUILTIN_ECHO
9255 { BUILTIN_REGULAR "echo" , echocmd },
9257 { BUILTIN_SPEC_REG "eval" , NULL }, /*evalcmd() has a differing prototype*/
9258 { BUILTIN_SPEC_REG "exec" , execcmd },
9259 { BUILTIN_SPEC_REG "exit" , exitcmd },
9260 { BUILTIN_SPEC_REG_ASSG "export" , exportcmd },
9261 { BUILTIN_REGULAR "false" , falsecmd },
9263 { BUILTIN_REGULAR "fg" , fg_bgcmd },
9265 #if ENABLE_ASH_GETOPTS
9266 { BUILTIN_REGULAR "getopts" , getoptscmd },
9268 { BUILTIN_NOSPEC "hash" , hashcmd },
9270 { BUILTIN_NOSPEC "help" , helpcmd },
9273 { BUILTIN_NOSPEC "history" , historycmd },
9276 { BUILTIN_REGULAR "jobs" , jobscmd },
9277 { BUILTIN_REGULAR "kill" , killcmd },
9279 #if ENABLE_SH_MATH_SUPPORT
9280 { BUILTIN_NOSPEC "let" , letcmd },
9282 { BUILTIN_ASSIGN "local" , localcmd },
9283 #if ENABLE_ASH_BUILTIN_PRINTF
9284 { BUILTIN_REGULAR "printf" , printfcmd },
9286 { BUILTIN_NOSPEC "pwd" , pwdcmd },
9287 { BUILTIN_REGULAR "read" , readcmd },
9288 { BUILTIN_SPEC_REG_ASSG "readonly", exportcmd },
9289 { BUILTIN_SPEC_REG "return" , returncmd },
9290 { BUILTIN_SPEC_REG "set" , setcmd },
9291 { BUILTIN_SPEC_REG "shift" , shiftcmd },
9292 #if ENABLE_ASH_BASH_COMPAT
9293 { BUILTIN_SPEC_REG "source" , dotcmd },
9295 #if ENABLE_ASH_BUILTIN_TEST
9296 { BUILTIN_REGULAR "test" , testcmd },
9298 { BUILTIN_SPEC_REG "times" , timescmd },
9299 { BUILTIN_SPEC_REG "trap" , trapcmd },
9300 { BUILTIN_REGULAR "true" , truecmd },
9301 { BUILTIN_NOSPEC "type" , typecmd },
9302 { BUILTIN_NOSPEC "ulimit" , ulimitcmd },
9303 { BUILTIN_REGULAR "umask" , umaskcmd },
9304 #if ENABLE_ASH_ALIAS
9305 { BUILTIN_REGULAR "unalias" , unaliascmd },
9307 { BUILTIN_SPEC_REG "unset" , unsetcmd },
9308 { BUILTIN_REGULAR "wait" , waitcmd },
9311 /* Should match the above table! */
9312 #define COMMANDCMD (builtintab + \
9314 /* [ */ 1 * ENABLE_ASH_BUILTIN_TEST + \
9315 /* [[ */ 1 * ENABLE_ASH_BUILTIN_TEST * ENABLE_ASH_BASH_COMPAT + \
9316 /* alias */ 1 * ENABLE_ASH_ALIAS + \
9317 /* bg */ 1 * ENABLE_ASH_JOB_CONTROL + \
9318 /* break cd cddir */ 3)
9319 #define EVALCMD (COMMANDCMD + \
9320 /* command */ 1 * ENABLE_ASH_CMDCMD + \
9321 /* continue */ 1 + \
9322 /* echo */ 1 * ENABLE_ASH_BUILTIN_ECHO + \
9324 #define EXECCMD (EVALCMD + \
9328 * Search the table of builtin commands.
9331 pstrcmp1(const void *a, const void *b)
9333 return strcmp((char*)a, *(char**)b + 1);
9335 static struct builtincmd *
9336 find_builtin(const char *name)
9338 struct builtincmd *bp;
9341 name, builtintab, ARRAY_SIZE(builtintab), sizeof(builtintab[0]),
9348 * Execute a simple command.
9351 isassignment(const char *p)
9353 const char *q = endofname(p);
9358 static int FAST_FUNC
9359 bltincmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
9361 /* Preserve exitstatus of a previous possible redirection
9362 * as POSIX mandates */
9363 return back_exitstatus;
9366 evalcommand(union node *cmd, int flags)
9368 static const struct builtincmd null_bltin = {
9369 "\0\0", bltincmd /* why three NULs? */
9371 struct stackmark smark;
9373 struct arglist arglist;
9374 struct arglist varlist;
9377 const struct strlist *sp;
9378 struct cmdentry cmdentry;
9385 struct builtincmd *bcmd;
9386 smallint cmd_is_exec;
9387 smallint pseudovarflag = 0;
9389 /* First expand the arguments. */
9390 TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags));
9391 setstackmark(&smark);
9392 back_exitstatus = 0;
9394 cmdentry.cmdtype = CMDBUILTIN;
9395 cmdentry.u.cmd = &null_bltin;
9396 varlist.lastp = &varlist.list;
9397 *varlist.lastp = NULL;
9398 arglist.lastp = &arglist.list;
9399 *arglist.lastp = NULL;
9402 if (cmd->ncmd.args) {
9403 bcmd = find_builtin(cmd->ncmd.args->narg.text);
9404 pseudovarflag = bcmd && IS_BUILTIN_ASSIGN(bcmd);
9407 for (argp = cmd->ncmd.args; argp; argp = argp->narg.next) {
9408 struct strlist **spp;
9410 spp = arglist.lastp;
9411 if (pseudovarflag && isassignment(argp->narg.text))
9412 expandarg(argp, &arglist, EXP_VARTILDE);
9414 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
9416 for (sp = *spp; sp; sp = sp->next)
9420 argv = nargv = stalloc(sizeof(char *) * (argc + 1));
9421 for (sp = arglist.list; sp; sp = sp->next) {
9422 TRACE(("evalcommand arg: %s\n", sp->text));
9423 *nargv++ = sp->text;
9428 if (iflag && funcnest == 0 && argc > 0)
9429 lastarg = nargv[-1];
9432 expredir(cmd->ncmd.redirect);
9433 status = redirectsafe(cmd->ncmd.redirect, REDIR_PUSH | REDIR_SAVEFD2);
9435 path = vpath.var_text;
9436 for (argp = cmd->ncmd.assign; argp; argp = argp->narg.next) {
9437 struct strlist **spp;
9440 spp = varlist.lastp;
9441 expandarg(argp, &varlist, EXP_VARTILDE);
9444 * Modify the command lookup path, if a PATH= assignment
9448 if (varcmp(p, path) == 0)
9452 /* Print the command if xflag is set. */
9455 const char *p = " %s" + 1;
9457 fdprintf(preverrout_fd, p, expandstr(ps4val()));
9459 for (n = 0; n < 2; n++) {
9461 fdprintf(preverrout_fd, p, sp->text);
9467 safe_write(preverrout_fd, "\n", 1);
9473 /* Now locate the command. */
9475 int cmd_flag = DO_ERR;
9476 #if ENABLE_ASH_CMDCMD
9477 const char *oldpath = path + 5;
9481 find_command(argv[0], &cmdentry, cmd_flag, path);
9482 if (cmdentry.cmdtype == CMDUNKNOWN) {
9483 flush_stdout_stderr();
9488 /* implement bltin and command here */
9489 if (cmdentry.cmdtype != CMDBUILTIN)
9492 spclbltin = IS_BUILTIN_SPECIAL(cmdentry.u.cmd);
9493 if (cmdentry.u.cmd == EXECCMD)
9495 #if ENABLE_ASH_CMDCMD
9496 if (cmdentry.u.cmd == COMMANDCMD) {
9498 nargv = parse_command_args(argv, &path);
9501 /* It's "command [-p] PROG ARGS" (that is, no -Vv).
9502 * nargv => "PROG". path is updated if -p.
9504 argc -= nargv - argv;
9506 cmd_flag |= DO_NOFUNC;
9514 /* We have a redirection error. */
9516 raise_exception(EXERROR);
9518 exitstatus = status;
9522 /* Execute the command. */
9523 switch (cmdentry.cmdtype) {
9526 #if ENABLE_FEATURE_SH_NOFORK
9527 /* (1) BUG: if variables are set, we need to fork, or save/restore them
9528 * around run_nofork_applet() call.
9529 * (2) Should this check also be done in forkshell()?
9530 * (perhaps it should, so that "VAR=VAL nofork" at least avoids exec...)
9532 /* find_command() encodes applet_no as (-2 - applet_no) */
9533 int applet_no = (- cmdentry.u.index - 2);
9534 if (applet_no >= 0 && APPLET_IS_NOFORK(applet_no)) {
9535 listsetvar(varlist.list, VEXPORT|VSTACK);
9536 /* run <applet>_main() */
9537 status = run_nofork_applet(applet_no, argv);
9541 /* Can we avoid forking off? For example, very last command
9542 * in a script or a subshell does not need forking,
9543 * we can just exec it.
9545 if (!(flags & EV_EXIT) || may_have_traps) {
9546 /* No, forking off a child is necessary */
9548 jp = makejob(/*cmd,*/ 1);
9549 if (forkshell(jp, cmd, FORK_FG) != 0) {
9551 status = waitforjob(jp);
9553 TRACE(("forked child exited with %d\n", status));
9558 /* fall through to exec'ing external program */
9560 listsetvar(varlist.list, VEXPORT|VSTACK);
9561 shellexec(argv, path, cmdentry.u.index);
9565 cmdenviron = varlist.list;
9567 struct strlist *list = cmdenviron;
9569 if (spclbltin > 0 || argc == 0) {
9571 if (cmd_is_exec && argc > 1)
9574 listsetvar(list, i);
9576 /* Tight loop with builtins only:
9577 * "while kill -0 $child; do true; done"
9578 * will never exit even if $child died, unless we do this
9579 * to reap the zombie and make kill detect that it's gone: */
9580 dowait(DOWAIT_NONBLOCK, NULL);
9582 if (evalbltin(cmdentry.u.cmd, argc, argv, flags)) {
9584 int i = exception_type;
9589 exit_status = 128 + SIGINT;
9591 exit_status = 128 + pending_sig;
9592 exitstatus = exit_status;
9593 if (i == EXINT || spclbltin > 0) {
9595 longjmp(exception_handler->loc, 1);
9602 listsetvar(varlist.list, 0);
9603 /* See above for the rationale */
9604 dowait(DOWAIT_NONBLOCK, NULL);
9605 if (evalfun(cmdentry.u.func, argc, argv, flags))
9608 status = exitstatus;
9613 if (cmd->ncmd.redirect)
9614 popredir(/*drop:*/ cmd_is_exec, /*restore:*/ cmd_is_exec);
9616 /* dsl: I think this is intended to be used to support
9617 * '_' in 'vi' command mode during line editing...
9618 * However I implemented that within libedit itself.
9620 setvar0("_", lastarg);
9622 popstackmark(&smark);
9628 evalbltin(const struct builtincmd *cmd, int argc, char **argv, int flags)
9630 char *volatile savecmdname;
9631 struct jmploc *volatile savehandler;
9632 struct jmploc jmploc;
9636 savecmdname = commandname;
9637 savehandler = exception_handler;
9638 i = setjmp(jmploc.loc);
9641 exception_handler = &jmploc;
9642 commandname = argv[0];
9644 optptr = NULL; /* initialize nextopt */
9646 status = evalcmd(argc, argv, flags);
9648 status = (*cmd->builtin)(argc, argv);
9649 flush_stdout_stderr();
9650 status |= ferror(stdout);
9651 exitstatus = status;
9654 commandname = savecmdname;
9655 exception_handler = savehandler;
9661 goodname(const char *p)
9663 return endofname(p)[0] == '\0';
9668 * Search for a command. This is called before we fork so that the
9669 * location of the command will be available in the parent as well as
9670 * the child. The check for "goodname" is an overly conservative
9671 * check that the name will not be subject to expansion.
9674 prehash(union node *n)
9676 struct cmdentry entry;
9678 if (n->type == NCMD && n->ncmd.args && goodname(n->ncmd.args->narg.text))
9679 find_command(n->ncmd.args->narg.text, &entry, 0, pathval());
9683 /* ============ Builtin commands
9685 * Builtin commands whose functions are closely tied to evaluation
9686 * are implemented here.
9690 * Handle break and continue commands. Break, continue, and return are
9691 * all handled by setting the evalskip flag. The evaluation routines
9692 * above all check this flag, and if it is set they start skipping
9693 * commands rather than executing them. The variable skipcount is
9694 * the number of loops to break/continue, or the number of function
9695 * levels to return. (The latter is always 1.) It should probably
9696 * be an error to break out of more loops than exist, but it isn't
9697 * in the standard shell so we don't make it one here.
9699 static int FAST_FUNC
9700 breakcmd(int argc UNUSED_PARAM, char **argv)
9702 int n = argv[1] ? number(argv[1]) : 1;
9705 ash_msg_and_raise_error(msg_illnum, argv[1]);
9709 evalskip = (**argv == 'c') ? SKIPCONT : SKIPBREAK;
9716 /* ============ input.c
9718 * This implements the input routines used by the parser.
9722 INPUT_PUSH_FILE = 1,
9723 INPUT_NOFILE_OK = 2,
9726 static smallint checkkwd;
9727 /* values of checkkwd variable */
9728 #define CHKALIAS 0x1
9733 * Push a string back onto the input at this current parsefile level.
9734 * We handle aliases this way.
9736 #if !ENABLE_ASH_ALIAS
9737 #define pushstring(s, ap) pushstring(s)
9740 pushstring(char *s, struct alias *ap)
9747 if (g_parsefile->strpush) {
9748 sp = ckzalloc(sizeof(*sp));
9749 sp->prev = g_parsefile->strpush;
9751 sp = &(g_parsefile->basestrpush);
9753 g_parsefile->strpush = sp;
9754 sp->prev_string = g_parsefile->next_to_pgetc;
9755 sp->prev_left_in_line = g_parsefile->left_in_line;
9756 sp->unget = g_parsefile->unget;
9757 memcpy(sp->lastc, g_parsefile->lastc, sizeof(sp->lastc));
9758 #if ENABLE_ASH_ALIAS
9761 ap->flag |= ALIASINUSE;
9765 g_parsefile->next_to_pgetc = s;
9766 g_parsefile->left_in_line = len;
9767 g_parsefile->unget = 0;
9774 struct strpush *sp = g_parsefile->strpush;
9777 #if ENABLE_ASH_ALIAS
9779 if (g_parsefile->next_to_pgetc[-1] == ' '
9780 || g_parsefile->next_to_pgetc[-1] == '\t'
9782 checkkwd |= CHKALIAS;
9784 if (sp->string != sp->ap->val) {
9787 sp->ap->flag &= ~ALIASINUSE;
9788 if (sp->ap->flag & ALIASDEAD) {
9789 unalias(sp->ap->name);
9793 g_parsefile->next_to_pgetc = sp->prev_string;
9794 g_parsefile->left_in_line = sp->prev_left_in_line;
9795 g_parsefile->unget = sp->unget;
9796 memcpy(g_parsefile->lastc, sp->lastc, sizeof(sp->lastc));
9797 g_parsefile->strpush = sp->prev;
9798 if (sp != &(g_parsefile->basestrpush))
9807 char *buf = g_parsefile->buf;
9809 g_parsefile->next_to_pgetc = buf;
9810 #if ENABLE_FEATURE_EDITING
9812 if (!iflag || g_parsefile->pf_fd != STDIN_FILENO)
9813 nr = nonblock_immune_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1);
9816 # if ENABLE_ASH_IDLE_TIMEOUT
9818 const char *tmout_var = lookupvar("TMOUT");
9820 timeout = atoi(tmout_var) * 1000;
9826 # if ENABLE_FEATURE_TAB_COMPLETION
9827 line_input_state->path_lookup = pathval();
9829 reinit_unicode_for_ash();
9830 nr = read_line_input(line_input_state, cmdedit_prompt, buf, IBUFSIZ, timeout);
9832 /* Ctrl+C pressed */
9843 /* Ctrl+D pressed */
9846 # if ENABLE_ASH_IDLE_TIMEOUT
9847 else if (errno == EAGAIN && timeout > 0) {
9848 puts("\007timed out waiting for input: auto-logout");
9855 nr = nonblock_immune_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1);
9858 #if 0 /* disabled: nonblock_immune_read() handles this problem */
9860 if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
9861 int flags = fcntl(0, F_GETFL);
9862 if (flags >= 0 && (flags & O_NONBLOCK)) {
9863 flags &= ~O_NONBLOCK;
9864 if (fcntl(0, F_SETFL, flags) >= 0) {
9865 out2str("sh: turning off NDELAY mode\n");
9876 * Refill the input buffer and return the next input character:
9878 * 1) If a string was pushed back on the input, pop it;
9879 * 2) If an EOF was pushed back (g_parsefile->left_in_line < -BIGNUM)
9880 * or we are reading from a string so we can't refill the buffer,
9882 * 3) If there is more stuff in this buffer, use it else call read to fill it.
9883 * 4) Process input up to the next newline, deleting nul characters.
9885 //#define pgetc_debug(...) bb_error_msg(__VA_ARGS__)
9886 #define pgetc_debug(...) ((void)0)
9887 static int pgetc(void);
9894 if (g_parsefile->strpush) {
9895 #if ENABLE_ASH_ALIAS
9896 if (g_parsefile->left_in_line == -1
9897 && g_parsefile->strpush->ap
9898 && g_parsefile->next_to_pgetc[-1] != ' '
9899 && g_parsefile->next_to_pgetc[-1] != '\t'
9901 pgetc_debug("preadbuffer PEOA");
9908 /* on both branches above g_parsefile->left_in_line < 0.
9909 * "pgetc" needs refilling.
9912 /* -90 is our -BIGNUM. Below we use -99 to mark "EOF on read",
9913 * pungetc() may increment it a few times.
9914 * Assuming it won't increment it to less than -90.
9916 if (g_parsefile->left_in_line < -90 || g_parsefile->buf == NULL) {
9917 pgetc_debug("preadbuffer PEOF1");
9918 /* even in failure keep left_in_line and next_to_pgetc
9919 * in lock step, for correct multi-layer pungetc.
9920 * left_in_line was decremented before preadbuffer(),
9921 * must inc next_to_pgetc: */
9922 g_parsefile->next_to_pgetc++;
9926 more = g_parsefile->left_in_buffer;
9928 flush_stdout_stderr();
9932 /* don't try reading again */
9933 g_parsefile->left_in_line = -99;
9934 pgetc_debug("preadbuffer PEOF2");
9935 g_parsefile->next_to_pgetc++;
9940 /* Find out where's the end of line.
9941 * Set g_parsefile->left_in_line
9942 * and g_parsefile->left_in_buffer acordingly.
9943 * NUL chars are deleted.
9945 q = g_parsefile->next_to_pgetc;
9953 memmove(q, q + 1, more);
9957 g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1;
9963 g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1;
9964 if (g_parsefile->left_in_line < 0)
9969 g_parsefile->left_in_buffer = more;
9974 out2str(g_parsefile->next_to_pgetc);
9978 pgetc_debug("preadbuffer at %d:%p'%s'",
9979 g_parsefile->left_in_line,
9980 g_parsefile->next_to_pgetc,
9981 g_parsefile->next_to_pgetc);
9982 return (unsigned char)*g_parsefile->next_to_pgetc++;
9988 g_parsefile->linno++;
9989 setprompt_if(doprompt, 2);
9994 g_parsefile->linno++;
9995 needprompt = doprompt;
10003 pgetc_debug("pgetc at %d:%p'%s'",
10004 g_parsefile->left_in_line,
10005 g_parsefile->next_to_pgetc,
10006 g_parsefile->next_to_pgetc);
10007 if (g_parsefile->unget)
10008 return g_parsefile->lastc[--g_parsefile->unget];
10010 if (--g_parsefile->left_in_line >= 0)
10011 c = (signed char)*g_parsefile->next_to_pgetc++;
10015 g_parsefile->lastc[1] = g_parsefile->lastc[0];
10016 g_parsefile->lastc[0] = c;
10021 #if ENABLE_ASH_ALIAS
10023 pgetc_without_PEOA(void)
10027 pgetc_debug("pgetc at %d:%p'%s'",
10028 g_parsefile->left_in_line,
10029 g_parsefile->next_to_pgetc,
10030 g_parsefile->next_to_pgetc);
10032 } while (c == PEOA);
10036 # define pgetc_without_PEOA() pgetc()
10040 * Read a line from the script.
10043 pfgets(char *line, int len)
10049 while (--nleft > 0) {
10050 c = pgetc_without_PEOA();
10065 * Undo a call to pgetc. Only two characters may be pushed back.
10066 * PEOF may be pushed back.
10071 g_parsefile->unget++;
10074 /* This one eats backslash+newline */
10080 while ((c = pgetc()) == '\\') {
10081 if (pgetc() != '\n') {
10093 * To handle the "." command, a stack of input files is used. Pushfile
10094 * adds a new entry to the stack and popfile restores the previous level.
10099 struct parsefile *pf;
10101 pf = ckzalloc(sizeof(*pf));
10102 pf->prev = g_parsefile;
10104 /*pf->strpush = NULL; - ckzalloc did it */
10105 /*pf->basestrpush.prev = NULL;*/
10113 struct parsefile *pf = g_parsefile;
10116 if (pf->pf_fd >= 0)
10119 while (pf->strpush)
10121 g_parsefile = pf->prev;
10127 * Return to top level.
10132 while (g_parsefile != &basepf)
10137 * Close the file(s) that the shell is reading commands from. Called
10138 * after a fork is done.
10144 if (g_parsefile->pf_fd > 0) {
10145 close(g_parsefile->pf_fd);
10146 g_parsefile->pf_fd = 0;
10151 * Like setinputfile, but takes an open file descriptor. Call this with
10155 setinputfd(int fd, int push)
10159 g_parsefile->buf = NULL;
10161 g_parsefile->pf_fd = fd;
10162 if (g_parsefile->buf == NULL)
10163 g_parsefile->buf = ckmalloc(IBUFSIZ);
10164 g_parsefile->left_in_buffer = 0;
10165 g_parsefile->left_in_line = 0;
10166 g_parsefile->linno = 1;
10170 * Set the input to take input from a file. If push is set, push the
10171 * old input onto the stack first.
10174 setinputfile(const char *fname, int flags)
10179 fd = open(fname, O_RDONLY);
10181 if (flags & INPUT_NOFILE_OK)
10184 ash_msg_and_raise_error("can't open '%s'", fname);
10189 close_on_exec_on(fd);
10190 setinputfd(fd, flags & INPUT_PUSH_FILE);
10197 * Like setinputfile, but takes input from a string.
10200 setinputstring(char *string)
10204 g_parsefile->next_to_pgetc = string;
10205 g_parsefile->left_in_line = strlen(string);
10206 g_parsefile->buf = NULL;
10207 g_parsefile->linno = 1;
10212 /* ============ mail.c
10214 * Routines to check for mail.
10217 #if ENABLE_ASH_MAIL
10219 /* Hash of mtimes of mailboxes */
10220 static unsigned mailtime_hash;
10221 /* Set if MAIL or MAILPATH is changed. */
10222 static smallint mail_var_path_changed;
10225 * Print appropriate message(s) if mail has arrived.
10226 * If mail_var_path_changed is set,
10227 * then the value of MAIL has mail_var_path_changed,
10228 * so we just update the values.
10237 struct stackmark smark;
10240 setstackmark(&smark);
10241 mpath = mpathset() ? mpathval() : mailval();
10244 p = path_advance(&mpath, nullstr);
10249 for (q = p; *q; q++)
10255 q[-1] = '\0'; /* delete trailing '/' */
10256 if (stat(p, &statb) < 0) {
10259 /* Very simplistic "hash": just a sum of all mtimes */
10260 new_hash += (unsigned)statb.st_mtime;
10262 if (!mail_var_path_changed && mailtime_hash != new_hash) {
10263 if (mailtime_hash != 0)
10264 out2str("you have mail\n");
10265 mailtime_hash = new_hash;
10267 mail_var_path_changed = 0;
10268 popstackmark(&smark);
10271 static void FAST_FUNC
10272 changemail(const char *val UNUSED_PARAM)
10274 mail_var_path_changed = 1;
10277 #endif /* ASH_MAIL */
10280 /* ============ ??? */
10283 * Set the shell parameters.
10286 setparam(char **argv)
10292 for (nparam = 0; argv[nparam]; nparam++)
10294 ap = newparam = ckmalloc((nparam + 1) * sizeof(*ap));
10296 *ap++ = ckstrdup(*argv++);
10299 freeparam(&shellparam);
10300 shellparam.malloced = 1;
10301 shellparam.nparam = nparam;
10302 shellparam.p = newparam;
10303 #if ENABLE_ASH_GETOPTS
10304 shellparam.optind = 1;
10305 shellparam.optoff = -1;
10310 * Process shell options. The global variable argptr contains a pointer
10311 * to the argument list; we advance it past the options.
10313 * SUSv3 section 2.8.1 "Consequences of Shell Errors" says:
10314 * For a non-interactive shell, an error condition encountered
10315 * by a special built-in ... shall cause the shell to write a diagnostic message
10316 * to standard error and exit as shown in the following table:
10317 * Error Special Built-In
10319 * Utility syntax error (option or operand error) Shall exit
10321 * However, in bug 1142 (http://busybox.net/bugs/view.php?id=1142)
10322 * we see that bash does not do that (set "finishes" with error code 1 instead,
10323 * and shell continues), and people rely on this behavior!
10325 * set -o barfoo 2>/dev/null
10328 * Oh well. Let's mimic that.
10331 plus_minus_o(char *name, int val)
10336 for (i = 0; i < NOPTS; i++) {
10337 if (strcmp(name, optnames(i)) == 0) {
10342 ash_msg("illegal option %co %s", val ? '-' : '+', name);
10345 for (i = 0; i < NOPTS; i++) {
10347 out1fmt("%-16s%s\n", optnames(i), optlist[i] ? "on" : "off");
10349 out1fmt("set %co %s\n", optlist[i] ? '-' : '+', optnames(i));
10355 setoption(int flag, int val)
10359 for (i = 0; i < NOPTS; i++) {
10360 if (optletters(i) == flag) {
10365 ash_msg_and_raise_error("illegal option %c%c", val ? '-' : '+', flag);
10369 options(int cmdline)
10377 while ((p = *argptr) != NULL) {
10379 if (c != '-' && c != '+')
10382 val = 0; /* val = 0 if c == '+' */
10385 if (p[0] == '\0' || LONE_DASH(p)) {
10387 /* "-" means turn off -x and -v */
10390 /* "--" means reset params */
10391 else if (*argptr == NULL)
10394 break; /* "-" or "--" terminates options */
10397 /* first char was + or - */
10398 while ((c = *p++) != '\0') {
10399 /* bash 3.2 indeed handles -c CMD and +c CMD the same */
10400 if (c == 'c' && cmdline) {
10401 minusc = p; /* command is after shell args */
10402 } else if (c == 'o') {
10403 if (plus_minus_o(*argptr, val)) {
10404 /* it already printed err message */
10405 return 1; /* error */
10409 } else if (cmdline && (c == 'l')) { /* -l or +l == --login */
10411 /* bash does not accept +-login, we also won't */
10412 } else if (cmdline && val && (c == '-')) { /* long options */
10413 if (strcmp(p, "login") == 0)
10425 * The shift builtin command.
10427 static int FAST_FUNC
10428 shiftcmd(int argc UNUSED_PARAM, char **argv)
10435 n = number(argv[1]);
10436 if (n > shellparam.nparam)
10437 n = 0; /* bash compat, was = shellparam.nparam; */
10439 shellparam.nparam -= n;
10440 for (ap1 = shellparam.p; --n >= 0; ap1++) {
10441 if (shellparam.malloced)
10444 ap2 = shellparam.p;
10445 while ((*ap2++ = *ap1++) != NULL)
10447 #if ENABLE_ASH_GETOPTS
10448 shellparam.optind = 1;
10449 shellparam.optoff = -1;
10456 * POSIX requires that 'set' (but not export or readonly) output the
10457 * variables in lexicographic order - by the locale's collating order (sigh).
10458 * Maybe we could keep them in an ordered balanced binary tree
10459 * instead of hashed lists.
10460 * For now just roll 'em through qsort for printing...
10463 showvars(const char *sep_prefix, int on, int off)
10466 char **ep, **epend;
10468 ep = listvars(on, off, &epend);
10469 qsort(ep, epend - ep, sizeof(char *), vpcmp);
10471 sep = *sep_prefix ? " " : sep_prefix;
10473 for (; ep < epend; ep++) {
10477 p = strchrnul(*ep, '=');
10480 q = single_quote(++p);
10481 out1fmt("%s%s%.*s%s\n", sep_prefix, sep, (int)(p - *ep), *ep, q);
10487 * The set command builtin.
10489 static int FAST_FUNC
10490 setcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
10495 return showvars(nullstr, 0, VUNSET);
10498 retval = options(/*cmdline:*/ 0);
10499 if (retval == 0) { /* if no parse error... */
10501 if (*argptr != NULL) {
10509 #if ENABLE_ASH_RANDOM_SUPPORT
10510 static void FAST_FUNC
10511 change_random(const char *value)
10515 if (value == NULL) {
10516 /* "get", generate */
10517 t = next_random(&random_gen);
10518 /* set without recursion */
10519 setvar(vrandom.var_text, utoa(t), VNOFUNC);
10520 vrandom.flags &= ~VNOFUNC;
10523 t = strtoul(value, NULL, 10);
10524 INIT_RANDOM_T(&random_gen, (t ? t : 1), t);
10529 #if ENABLE_ASH_GETOPTS
10531 getopts(char *optstr, char *optvar, char **optfirst)
10538 int ind = shellparam.optind;
10539 int off = shellparam.optoff;
10543 shellparam.optind = -1;
10544 optnext = optfirst + ind - 1;
10546 if (ind <= 1 || off < 0 || (int)strlen(optnext[-1]) < off)
10549 p = optnext[-1] + off;
10550 if (p == NULL || *p == '\0') {
10551 /* Current word is done, advance */
10553 if (p == NULL || *p != '-' || *++p == '\0') {
10560 if (LONE_DASH(p)) /* check for "--" */
10565 for (q = optstr; *q != c;) {
10567 if (optstr[0] == ':') {
10569 /*sbuf[1] = '\0'; - already is */
10570 setvar0("OPTARG", sbuf);
10572 fprintf(stderr, "Illegal option -%c\n", c);
10573 unsetvar("OPTARG");
10583 if (*p == '\0' && (p = *optnext) == NULL) {
10584 if (optstr[0] == ':') {
10586 /*sbuf[1] = '\0'; - already is */
10587 setvar0("OPTARG", sbuf);
10590 fprintf(stderr, "No arg for -%c option\n", c);
10591 unsetvar("OPTARG");
10599 setvar0("OPTARG", p);
10602 setvar0("OPTARG", nullstr);
10604 ind = optnext - optfirst + 1;
10605 setvar("OPTIND", itoa(ind), VNOFUNC);
10607 /*sbuf[1] = '\0'; - already is */
10608 setvar0(optvar, sbuf);
10610 shellparam.optoff = p ? p - *(optnext - 1) : -1;
10611 shellparam.optind = ind;
10617 * The getopts builtin. Shellparam.optnext points to the next argument
10618 * to be processed. Shellparam.optptr points to the next character to
10619 * be processed in the current argument. If shellparam.optnext is NULL,
10620 * then it's the first time getopts has been called.
10622 static int FAST_FUNC
10623 getoptscmd(int argc, char **argv)
10628 ash_msg_and_raise_error("usage: getopts optstring var [arg]");
10630 optbase = shellparam.p;
10631 if ((unsigned)shellparam.optind > shellparam.nparam + 1) {
10632 shellparam.optind = 1;
10633 shellparam.optoff = -1;
10636 optbase = &argv[3];
10637 if ((unsigned)shellparam.optind > argc - 2) {
10638 shellparam.optind = 1;
10639 shellparam.optoff = -1;
10643 return getopts(argv[1], argv[2], optbase);
10645 #endif /* ASH_GETOPTS */
10648 /* ============ Shell parser */
10651 struct heredoc *next; /* next here document in list */
10652 union node *here; /* redirection node */
10653 char *eofmark; /* string indicating end of input */
10654 smallint striptabs; /* if set, strip leading tabs */
10657 static smallint tokpushback; /* last token pushed back */
10658 static smallint quoteflag; /* set if (part of) last token was quoted */
10659 static token_id_t lasttoken; /* last token read (integer id Txxx) */
10660 static struct heredoc *heredoclist; /* list of here documents to read */
10661 static char *wordtext; /* text of last word returned by readtoken */
10662 static struct nodelist *backquotelist;
10663 static union node *redirnode;
10664 static struct heredoc *heredoc;
10666 static const char *
10667 tokname(char *buf, int tok)
10670 return tokname_array[tok];
10671 sprintf(buf, "\"%s\"", tokname_array[tok]);
10675 /* raise_error_unexpected_syntax:
10676 * Called when an unexpected token is read during the parse. The argument
10677 * is the token that is expected, or -1 if more than one type of token can
10678 * occur at this point.
10680 static void raise_error_unexpected_syntax(int) NORETURN;
10682 raise_error_unexpected_syntax(int token)
10688 l = sprintf(msg, "unexpected %s", tokname(buf, lasttoken));
10690 sprintf(msg + l, " (expecting %s)", tokname(buf, token));
10691 raise_error_syntax(msg);
10695 #define EOFMARKLEN 79
10697 /* parsing is heavily cross-recursive, need these forward decls */
10698 static union node *andor(void);
10699 static union node *pipeline(void);
10700 static union node *parse_command(void);
10701 static void parseheredoc(void);
10702 static int peektoken(void);
10703 static int readtoken(void);
10705 static union node *
10708 union node *n1, *n2, *n3;
10713 switch (peektoken()) {
10721 if (!n1 && (nlflag & 1))
10727 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10728 if (nlflag == 2 && ((1 << peektoken()) & tokendlist))
10734 if (tok == TBACKGND) {
10735 if (n2->type == NPIPE) {
10736 n2->npipe.pipe_backgnd = 1;
10738 if (n2->type != NREDIR) {
10739 n3 = stzalloc(sizeof(struct nredir));
10741 /*n3->nredir.redirect = NULL; - stzalloc did it */
10744 n2->type = NBACKGND;
10750 n3 = stzalloc(sizeof(struct nbinary));
10752 n3->nbinary.ch1 = n1;
10753 n3->nbinary.ch2 = n2;
10766 raise_error_unexpected_syntax(-1);
10773 static union node *
10776 union node *n1, *n2, *n3;
10784 } else if (t == TOR) {
10790 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10792 n3 = stzalloc(sizeof(struct nbinary));
10794 n3->nbinary.ch1 = n1;
10795 n3->nbinary.ch2 = n2;
10800 static union node *
10803 union node *n1, *n2, *pipenode;
10804 struct nodelist *lp, *prev;
10808 TRACE(("pipeline: entered\n"));
10809 if (readtoken() == TNOT) {
10811 checkkwd = CHKKWD | CHKALIAS;
10814 n1 = parse_command();
10815 if (readtoken() == TPIPE) {
10816 pipenode = stzalloc(sizeof(struct npipe));
10817 pipenode->type = NPIPE;
10818 /*pipenode->npipe.pipe_backgnd = 0; - stzalloc did it */
10819 lp = stzalloc(sizeof(struct nodelist));
10820 pipenode->npipe.cmdlist = lp;
10824 lp = stzalloc(sizeof(struct nodelist));
10825 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10826 lp->n = parse_command();
10828 } while (readtoken() == TPIPE);
10834 n2 = stzalloc(sizeof(struct nnot));
10842 static union node *
10847 n = stzalloc(sizeof(struct narg));
10849 /*n->narg.next = NULL; - stzalloc did it */
10850 n->narg.text = wordtext;
10851 n->narg.backquote = backquotelist;
10856 fixredir(union node *n, const char *text, int err)
10860 TRACE(("Fix redir %s %d\n", text, err));
10862 n->ndup.vname = NULL;
10864 fd = bb_strtou(text, NULL, 10);
10865 if (!errno && fd >= 0)
10866 n->ndup.dupfd = fd;
10867 else if (LONE_DASH(text))
10868 n->ndup.dupfd = -1;
10871 raise_error_syntax("bad fd number");
10872 n->ndup.vname = makename();
10877 * Returns true if the text contains nothing to expand (no dollar signs
10881 noexpand(const char *text)
10885 while ((c = *text++) != '\0') {
10886 if (c == CTLQUOTEMARK)
10890 else if (SIT(c, BASESYNTAX) == CCTL)
10899 union node *n = redirnode;
10901 if (readtoken() != TWORD)
10902 raise_error_unexpected_syntax(-1);
10903 if (n->type == NHERE) {
10904 struct heredoc *here = heredoc;
10908 if (quoteflag == 0)
10910 TRACE(("Here document %d\n", n->type));
10911 if (!noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN)
10912 raise_error_syntax("illegal eof marker for << redirection");
10913 rmescapes(wordtext, 0);
10914 here->eofmark = wordtext;
10916 if (heredoclist == NULL)
10917 heredoclist = here;
10919 for (p = heredoclist; p->next; p = p->next)
10923 } else if (n->type == NTOFD || n->type == NFROMFD) {
10924 fixredir(n, wordtext, 0);
10926 n->nfile.fname = makename();
10930 static union node *
10933 union node *args, **app;
10934 union node *n = NULL;
10935 union node *vars, **vpp;
10936 union node **rpp, *redir;
10938 #if ENABLE_ASH_BASH_COMPAT
10939 smallint double_brackets_flag = 0;
10940 smallint function_flag = 0;
10950 savecheckkwd = CHKALIAS;
10953 checkkwd = savecheckkwd;
10956 #if ENABLE_ASH_BASH_COMPAT
10958 if (peektoken() != TWORD)
10959 raise_error_unexpected_syntax(TWORD);
10962 case TAND: /* "&&" */
10963 case TOR: /* "||" */
10964 if (!double_brackets_flag) {
10968 wordtext = (char *) (t == TAND ? "-a" : "-o");
10971 n = stzalloc(sizeof(struct narg));
10973 /*n->narg.next = NULL; - stzalloc did it */
10974 n->narg.text = wordtext;
10975 #if ENABLE_ASH_BASH_COMPAT
10976 if (strcmp("[[", wordtext) == 0)
10977 double_brackets_flag = 1;
10978 else if (strcmp("]]", wordtext) == 0)
10979 double_brackets_flag = 0;
10981 n->narg.backquote = backquotelist;
10982 if (savecheckkwd && isassignment(wordtext)) {
10984 vpp = &n->narg.next;
10987 app = &n->narg.next;
10990 #if ENABLE_ASH_BASH_COMPAT
10991 if (function_flag) {
10992 checkkwd = CHKNL | CHKKWD;
10993 switch (peektoken()) {
11005 if (strcmp("[[", wordtext) == 0)
11009 raise_error_unexpected_syntax(-1);
11015 *rpp = n = redirnode;
11016 rpp = &n->nfile.next;
11017 parsefname(); /* read name of redirection file */
11020 IF_ASH_BASH_COMPAT(do_func:)
11021 if (args && app == &args->narg.next
11024 struct builtincmd *bcmd;
11027 /* We have a function */
11028 if (IF_ASH_BASH_COMPAT(!function_flag &&) readtoken() != TRP)
11029 raise_error_unexpected_syntax(TRP);
11030 name = n->narg.text;
11031 if (!goodname(name)
11032 || ((bcmd = find_builtin(name)) && IS_BUILTIN_SPECIAL(bcmd))
11034 raise_error_syntax("bad function name");
11037 checkkwd = CHKNL | CHKKWD | CHKALIAS;
11038 n->narg.next = parse_command();
11041 IF_ASH_BASH_COMPAT(function_flag = 0;)
11052 n = stzalloc(sizeof(struct ncmd));
11054 n->ncmd.args = args;
11055 n->ncmd.assign = vars;
11056 n->ncmd.redirect = redir;
11060 static union node *
11061 parse_command(void)
11063 union node *n1, *n2;
11064 union node *ap, **app;
11065 union node *cp, **cpp;
11066 union node *redir, **rpp;
11073 switch (readtoken()) {
11075 raise_error_unexpected_syntax(-1);
11078 n1 = stzalloc(sizeof(struct nif));
11080 n1->nif.test = list(0);
11081 if (readtoken() != TTHEN)
11082 raise_error_unexpected_syntax(TTHEN);
11083 n1->nif.ifpart = list(0);
11085 while (readtoken() == TELIF) {
11086 n2->nif.elsepart = stzalloc(sizeof(struct nif));
11087 n2 = n2->nif.elsepart;
11089 n2->nif.test = list(0);
11090 if (readtoken() != TTHEN)
11091 raise_error_unexpected_syntax(TTHEN);
11092 n2->nif.ifpart = list(0);
11094 if (lasttoken == TELSE)
11095 n2->nif.elsepart = list(0);
11097 n2->nif.elsepart = NULL;
11105 n1 = stzalloc(sizeof(struct nbinary));
11106 n1->type = (lasttoken == TWHILE) ? NWHILE : NUNTIL;
11107 n1->nbinary.ch1 = list(0);
11110 TRACE(("expecting DO got '%s' %s\n", tokname_array[got],
11111 got == TWORD ? wordtext : ""));
11112 raise_error_unexpected_syntax(TDO);
11114 n1->nbinary.ch2 = list(0);
11119 if (readtoken() != TWORD || quoteflag || !goodname(wordtext))
11120 raise_error_syntax("bad for loop variable");
11121 n1 = stzalloc(sizeof(struct nfor));
11123 n1->nfor.var = wordtext;
11124 checkkwd = CHKNL | CHKKWD | CHKALIAS;
11125 if (readtoken() == TIN) {
11127 while (readtoken() == TWORD) {
11128 n2 = stzalloc(sizeof(struct narg));
11130 /*n2->narg.next = NULL; - stzalloc did it */
11131 n2->narg.text = wordtext;
11132 n2->narg.backquote = backquotelist;
11134 app = &n2->narg.next;
11137 n1->nfor.args = ap;
11138 if (lasttoken != TNL && lasttoken != TSEMI)
11139 raise_error_unexpected_syntax(-1);
11141 n2 = stzalloc(sizeof(struct narg));
11143 /*n2->narg.next = NULL; - stzalloc did it */
11144 n2->narg.text = (char *)dolatstr;
11145 /*n2->narg.backquote = NULL;*/
11146 n1->nfor.args = n2;
11148 * Newline or semicolon here is optional (but note
11149 * that the original Bourne shell only allowed NL).
11151 if (lasttoken != TSEMI)
11154 checkkwd = CHKNL | CHKKWD | CHKALIAS;
11155 if (readtoken() != TDO)
11156 raise_error_unexpected_syntax(TDO);
11157 n1->nfor.body = list(0);
11161 n1 = stzalloc(sizeof(struct ncase));
11163 if (readtoken() != TWORD)
11164 raise_error_unexpected_syntax(TWORD);
11165 n1->ncase.expr = n2 = stzalloc(sizeof(struct narg));
11167 /*n2->narg.next = NULL; - stzalloc did it */
11168 n2->narg.text = wordtext;
11169 n2->narg.backquote = backquotelist;
11170 checkkwd = CHKNL | CHKKWD | CHKALIAS;
11171 if (readtoken() != TIN)
11172 raise_error_unexpected_syntax(TIN);
11173 cpp = &n1->ncase.cases;
11175 checkkwd = CHKNL | CHKKWD;
11177 while (t != TESAC) {
11178 if (lasttoken == TLP)
11180 *cpp = cp = stzalloc(sizeof(struct nclist));
11182 app = &cp->nclist.pattern;
11184 *app = ap = stzalloc(sizeof(struct narg));
11186 /*ap->narg.next = NULL; - stzalloc did it */
11187 ap->narg.text = wordtext;
11188 ap->narg.backquote = backquotelist;
11189 if (readtoken() != TPIPE)
11191 app = &ap->narg.next;
11194 //ap->narg.next = NULL;
11195 if (lasttoken != TRP)
11196 raise_error_unexpected_syntax(TRP);
11197 cp->nclist.body = list(2);
11199 cpp = &cp->nclist.next;
11201 checkkwd = CHKNL | CHKKWD;
11205 raise_error_unexpected_syntax(TENDCASE);
11212 n1 = stzalloc(sizeof(struct nredir));
11213 n1->type = NSUBSHELL;
11214 n1->nredir.n = list(0);
11215 /*n1->nredir.redirect = NULL; - stzalloc did it */
11222 IF_ASH_BASH_COMPAT(case TFUNCTION:)
11226 return simplecmd();
11229 if (readtoken() != t)
11230 raise_error_unexpected_syntax(t);
11233 /* Now check for redirection which may follow command */
11234 checkkwd = CHKKWD | CHKALIAS;
11236 while (readtoken() == TREDIR) {
11237 *rpp = n2 = redirnode;
11238 rpp = &n2->nfile.next;
11244 if (n1->type != NSUBSHELL) {
11245 n2 = stzalloc(sizeof(struct nredir));
11250 n1->nredir.redirect = redir;
11255 #if ENABLE_ASH_BASH_COMPAT
11257 decode_dollar_squote(void)
11259 static const char C_escapes[] ALIGN1 = "nrbtfav""x\\01234567";
11265 p = strchr(C_escapes, c);
11270 if ((unsigned char)(c - '0') <= 7) { /* \ooo */
11274 } while ((unsigned char)(c - '0') <= 7 && --cnt);
11276 } else if (c == 'x') { /* \xHH */
11280 } while (isxdigit(c) && --cnt);
11282 if (cnt == 3) { /* \x but next char is "bad" */
11286 } else { /* simple seq like \\ or \t */
11291 c = bb_process_escape_sequence((void*)&p);
11292 } else { /* unrecognized "\z": print both chars unless ' or " */
11293 if (c != '\'' && c != '"') {
11295 c |= 0x100; /* "please encode \, then me" */
11303 * If eofmark is NULL, read a word or a redirection symbol. If eofmark
11304 * is not NULL, read a here document. In the latter case, eofmark is the
11305 * word which marks the end of the document and striptabs is true if
11306 * leading tabs should be stripped from the document. The argument c
11307 * is the first character of the input token or document.
11309 * Because C does not have internal subroutines, I have simulated them
11310 * using goto's to implement the subroutine linkage. The following macros
11311 * will run code that appears at the end of readtoken1.
11313 #define CHECKEND() {goto checkend; checkend_return:;}
11314 #define PARSEREDIR() {goto parseredir; parseredir_return:;}
11315 #define PARSESUB() {goto parsesub; parsesub_return:;}
11316 #define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;}
11317 #define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;}
11318 #define PARSEARITH() {goto parsearith; parsearith_return:;}
11320 readtoken1(int c, int syntax, char *eofmark, int striptabs)
11322 /* NB: syntax parameter fits into smallint */
11323 /* c parameter is an unsigned char or PEOF or PEOA */
11326 char line[EOFMARKLEN + 1];
11327 struct nodelist *bqlist;
11331 smallint prevsyntax; /* syntax before arithmetic */
11332 #if ENABLE_ASH_EXPAND_PRMT
11333 smallint pssyntax; /* we are expanding a prompt string */
11335 int varnest; /* levels of variables expansion */
11336 int arinest; /* levels of arithmetic expansion */
11337 int parenlevel; /* levels of parens in arithmetic */
11338 int dqvarnest; /* levels of variables expansion within double quotes */
11340 IF_ASH_BASH_COMPAT(smallint bash_dollar_squote = 0;)
11342 startlinno = g_parsefile->linno;
11346 #if ENABLE_ASH_EXPAND_PRMT
11347 pssyntax = (syntax == PSSYNTAX);
11351 dblquote = (syntax == DQSYNTAX);
11357 STARTSTACKSTR(out);
11359 /* For each line, until end of word */
11360 CHECKEND(); /* set c to PEOF if at end of here document */
11361 for (;;) { /* until end of line or end of word */
11362 CHECKSTRSPACE(4, out); /* permit 4 calls to USTPUTC */
11363 switch (SIT(c, syntax)) {
11364 case CNL: /* '\n' */
11365 if (syntax == BASESYNTAX)
11366 goto endword; /* exit outer loop */
11370 goto loop; /* continue outer loop */
11375 #if ENABLE_ASH_BASH_COMPAT
11376 if (c == '\\' && bash_dollar_squote) {
11377 c = decode_dollar_squote();
11379 /* skip $'\000', $'\x00' (like bash) */
11383 /* Unknown escape. Encode as '\z' */
11384 c = (unsigned char)c;
11385 if (eofmark == NULL || dblquote)
11386 USTPUTC(CTLESC, out);
11387 USTPUTC('\\', out);
11391 if (eofmark == NULL || dblquote)
11392 USTPUTC(CTLESC, out);
11395 case CBACK: /* backslash */
11396 c = pgetc_without_PEOA();
11398 USTPUTC(CTLESC, out);
11399 USTPUTC('\\', out);
11401 } else if (c == '\n') {
11404 #if ENABLE_ASH_EXPAND_PRMT
11405 if (c == '$' && pssyntax) {
11406 USTPUTC(CTLESC, out);
11407 USTPUTC('\\', out);
11410 /* Backslash is retained if we are in "str" and next char isn't special */
11415 && (c != '"' || eofmark != NULL)
11417 USTPUTC('\\', out);
11419 USTPUTC(CTLESC, out);
11427 if (eofmark == NULL) {
11428 USTPUTC(CTLQUOTEMARK, out);
11436 IF_ASH_BASH_COMPAT(bash_dollar_squote = 0;)
11437 if (eofmark != NULL && varnest == 0) {
11440 if (dqvarnest == 0) {
11441 syntax = BASESYNTAX;
11448 case CVAR: /* '$' */
11449 PARSESUB(); /* parse substitution */
11451 case CENDVAR: /* '}' */
11454 if (dqvarnest > 0) {
11461 #if ENABLE_SH_MATH_SUPPORT
11462 case CLP: /* '(' in arithmetic */
11466 case CRP: /* ')' in arithmetic */
11467 if (parenlevel > 0) {
11470 if (pgetc_eatbnl() == ')') {
11472 if (--arinest == 0) {
11473 syntax = prevsyntax;
11477 * unbalanced parens
11478 * (don't 2nd guess - no error)
11486 case CBQUOTE: /* '`' */
11490 goto endword; /* exit outer loop */
11494 if (varnest == 0) {
11495 #if ENABLE_ASH_BASH_COMPAT
11497 //Can't call pgetc_eatbnl() here, this requires three-deep pungetc()
11498 if (pgetc() == '>')
11499 c = 0x100 + '>'; /* flag &> */
11503 goto endword; /* exit outer loop */
11505 IF_ASH_ALIAS(if (c != PEOA))
11512 #if ENABLE_SH_MATH_SUPPORT
11513 if (syntax == ARISYNTAX)
11514 raise_error_syntax("missing '))'");
11516 if (syntax != BASESYNTAX && eofmark == NULL)
11517 raise_error_syntax("unterminated quoted string");
11518 if (varnest != 0) {
11519 startlinno = g_parsefile->linno;
11521 raise_error_syntax("missing '}'");
11523 USTPUTC('\0', out);
11524 len = out - (char *)stackblock();
11525 out = stackblock();
11526 if (eofmark == NULL) {
11527 if ((c == '>' || c == '<' IF_ASH_BASH_COMPAT( || c == 0x100 + '>'))
11530 if (isdigit_str9(out)) {
11531 PARSEREDIR(); /* passed as params: out, c */
11532 lasttoken = TREDIR;
11535 /* else: non-number X seen, interpret it
11536 * as "NNNX>file" = "NNNX >file" */
11540 quoteflag = quotef;
11541 backquotelist = bqlist;
11542 grabstackblock(len);
11546 /* end of readtoken routine */
11549 * Check to see whether we are at the end of the here document. When this
11550 * is called, c is set to the first character of the next input line. If
11551 * we are at the end of the here document, this routine sets the c to PEOF.
11555 #if ENABLE_ASH_ALIAS
11557 c = pgetc_without_PEOA();
11560 while (c == '\t') {
11561 c = pgetc_without_PEOA();
11564 if (c == *eofmark) {
11565 if (pfgets(line, sizeof(line)) != NULL) {
11570 for (q = eofmark + 1;; p++, q++) {
11574 if (!*q || cc != *q)
11581 pushstring(line, NULL);
11586 goto checkend_return;
11590 * Parse a redirection operator. The variable "out" points to a string
11591 * specifying the fd to be redirected. The variable "c" contains the
11592 * first character of the redirection operator.
11595 /* out is already checked to be a valid number or "" */
11596 int fd = (*out == '\0' ? -1 : atoi(out));
11599 np = stzalloc(sizeof(struct nfile));
11604 np->type = NAPPEND;
11606 np->type = NCLOBBER;
11609 /* it also can be NTO2 (>&file), but we can't figure it out yet */
11615 #if ENABLE_ASH_BASH_COMPAT
11616 else if (c == 0x100 + '>') { /* this flags &> redirection */
11618 pgetc(); /* this is '>', no need to check */
11622 else { /* c == '<' */
11623 /*np->nfile.fd = 0; - stzalloc did it */
11627 if (sizeof(struct nfile) != sizeof(struct nhere)) {
11628 np = stzalloc(sizeof(struct nhere));
11629 /*np->nfile.fd = 0; - stzalloc did it */
11632 heredoc = stzalloc(sizeof(struct heredoc));
11633 heredoc->here = np;
11636 heredoc->striptabs = 1;
11638 /*heredoc->striptabs = 0; - stzalloc did it */
11644 np->type = NFROMFD;
11648 np->type = NFROMTO;
11660 goto parseredir_return;
11664 * Parse a substitution. At this point, we have read the dollar sign
11665 * and nothing else.
11668 /* is_special(c) evaluates to 1 for c in "!#$*-0123456789?@"; 0 otherwise
11669 * (assuming ascii char codes, as the original implementation did) */
11670 #define is_special(c) \
11671 (((unsigned)(c) - 33 < 32) \
11672 && ((0xc1ff920dU >> ((unsigned)(c) - 33)) & 1))
11674 unsigned char subtype;
11677 c = pgetc_eatbnl();
11678 if (c > 255 /* PEOA or PEOF */
11679 || (c != '(' && c != '{' && !is_name(c) && !is_special(c))
11681 #if ENABLE_ASH_BASH_COMPAT
11682 if (syntax != DQSYNTAX && c == '\'')
11683 bash_dollar_squote = 1;
11688 } else if (c == '(') {
11689 /* $(command) or $((arith)) */
11690 if (pgetc_eatbnl() == '(') {
11691 #if ENABLE_SH_MATH_SUPPORT
11694 raise_error_syntax("you disabled math support for $((arith)) syntax");
11701 /* $VAR, $<specialchar>, ${...}, or PEOA/PEOF */
11702 USTPUTC(CTLVAR, out);
11703 typeloc = out - (char *)stackblock();
11705 subtype = VSNORMAL;
11707 c = pgetc_eatbnl();
11712 /* $[{[#]]NAME[}] */
11715 c = pgetc_eatbnl();
11716 } while (is_in_name(c));
11717 } else if (isdigit(c)) {
11718 /* $[{[#]]NUM[}] */
11721 c = pgetc_eatbnl();
11722 } while (isdigit(c));
11723 } else if (is_special(c)) {
11724 /* $[{[#]]<specialchar>[}] */
11727 c = pgetc_eatbnl();
11728 if (!subtype && cc == '#') {
11729 subtype = VSLENGTH;
11730 if (c == '_' || isalnum(c))
11733 c = pgetc_eatbnl();
11734 if (cc == '}' || c != '}') {
11745 if (c != '}' && subtype == VSLENGTH) {
11746 /* ${#VAR didn't end with } */
11750 if (subtype == 0) {
11751 static const char types[] ALIGN1 = "}-+?=";
11752 /* ${VAR...} but not $VAR or ${#VAR} */
11753 /* c == first char after VAR */
11756 c = pgetc_eatbnl();
11757 #if ENABLE_ASH_BASH_COMPAT
11758 /* This check is only needed to not misinterpret
11759 * ${VAR:-WORD}, ${VAR:+WORD}, ${VAR:=WORD}, ${VAR:?WORD}
11762 if (!strchr(types, c)) {
11763 subtype = VSSUBSTR;
11765 break; /* "goto badsub" is bigger (!) */
11771 const char *p = strchr(types, c);
11774 subtype |= p - types + VSNORMAL;
11780 subtype = (c == '#' ? VSTRIMLEFT : VSTRIMRIGHT);
11781 c = pgetc_eatbnl();
11787 #if ENABLE_ASH_BASH_COMPAT
11789 /* ${v/[/]pattern/repl} */
11790 //TODO: encode pattern and repl separately.
11791 // Currently ${v/$var_with_slash/repl} is horribly broken
11792 subtype = VSREPLACE;
11793 c = pgetc_eatbnl();
11796 subtype++; /* VSREPLACEALL */
11804 ((unsigned char *)stackblock())[typeloc] = subtype;
11805 if (subtype != VSNORMAL) {
11812 goto parsesub_return;
11816 * Called to parse command substitutions. Newstyle is set if the command
11817 * is enclosed inside $(...); nlpp is a pointer to the head of the linked
11818 * list of commands (passed by reference), and savelen is the number of
11819 * characters on the top of the stack which must be preserved.
11822 struct nodelist **nlpp;
11826 smallint saveprompt = 0;
11829 savelen = out - (char *)stackblock();
11832 * FIXME: this can allocate very large block on stack and SEGV.
11834 * echo "..<100kbytes>..`true` $(true) `true` ..."
11835 * allocates 100kb for every command subst. With about
11836 * a hundred command substitutions stack overflows.
11837 * With larger prepended string, SEGV happens sooner.
11839 str = alloca(savelen);
11840 memcpy(str, stackblock(), savelen);
11844 /* We must read until the closing backquote, giving special
11845 * treatment to some slashes, and then push the string and
11846 * reread it as input, interpreting it normally.
11852 STARTSTACKSTR(pout);
11856 setprompt_if(needprompt, 2);
11867 * If eating a newline, avoid putting
11868 * the newline into the new character
11869 * stream (via the STPUTC after the
11874 if (pc != '\\' && pc != '`' && pc != '$'
11875 && (!dblquote || pc != '"')
11877 STPUTC('\\', pout);
11879 if (pc <= 255 /* not PEOA or PEOF */) {
11885 IF_ASH_ALIAS(case PEOA:)
11886 startlinno = g_parsefile->linno;
11887 raise_error_syntax("EOF in backquote substitution");
11899 STPUTC('\0', pout);
11900 psavelen = pout - (char *)stackblock();
11901 if (psavelen > 0) {
11902 pstr = grabstackstr(pout);
11903 setinputstring(pstr);
11908 nlpp = &(*nlpp)->next;
11909 *nlpp = stzalloc(sizeof(**nlpp));
11910 /* (*nlpp)->next = NULL; - stzalloc did it */
11913 saveprompt = doprompt;
11920 doprompt = saveprompt;
11921 else if (readtoken() != TRP)
11922 raise_error_unexpected_syntax(TRP);
11927 * Start reading from old file again, ignoring any pushed back
11928 * tokens left from the backquote parsing
11933 while (stackblocksize() <= savelen)
11935 STARTSTACKSTR(out);
11937 memcpy(out, str, savelen);
11938 STADJUST(savelen, out);
11940 USTPUTC(CTLBACKQ, out);
11942 goto parsebackq_oldreturn;
11943 goto parsebackq_newreturn;
11946 #if ENABLE_SH_MATH_SUPPORT
11948 * Parse an arithmetic expansion (indicate start of one and set state)
11951 if (++arinest == 1) {
11952 prevsyntax = syntax;
11953 syntax = ARISYNTAX;
11955 USTPUTC(CTLARI, out);
11956 goto parsearith_return;
11959 } /* end of readtoken */
11962 * Read the next input token.
11963 * If the token is a word, we set backquotelist to the list of cmds in
11964 * backquotes. We set quoteflag to true if any part of the word was
11966 * If the token is TREDIR, then we set redirnode to a structure containing
11968 * In all cases, the variable startlinno is set to the number of the line
11969 * on which the token starts.
11971 * [Change comment: here documents and internal procedures]
11972 * [Readtoken shouldn't have any arguments. Perhaps we should make the
11973 * word parsing code into a separate routine. In this case, readtoken
11974 * doesn't need to have any internal procedures, but parseword does.
11975 * We could also make parseoperator in essence the main routine, and
11976 * have parseword (readtoken1?) handle both words and redirection.]
11978 #define NEW_xxreadtoken
11979 #ifdef NEW_xxreadtoken
11980 /* singles must be first! */
11981 static const char xxreadtoken_chars[7] ALIGN1 = {
11982 '\n', '(', ')', /* singles */
11983 '&', '|', ';', /* doubles */
11987 #define xxreadtoken_singles 3
11988 #define xxreadtoken_doubles 3
11990 static const char xxreadtoken_tokens[] ALIGN1 = {
11991 TNL, TLP, TRP, /* only single occurrence allowed */
11992 TBACKGND, TPIPE, TSEMI, /* if single occurrence */
11993 TEOF, /* corresponds to trailing nul */
11994 TAND, TOR, TENDCASE /* if double occurrence */
12006 setprompt_if(needprompt, 2);
12007 startlinno = g_parsefile->linno;
12008 for (;;) { /* until token or start of word found */
12010 if (c == ' ' || c == '\t' IF_ASH_ALIAS( || c == PEOA))
12014 while ((c = pgetc()) != '\n' && c != PEOF)
12017 } else if (c == '\\') {
12018 if (pgetc() != '\n') {
12020 break; /* return readtoken1(...) */
12026 p = xxreadtoken_chars + sizeof(xxreadtoken_chars) - 1;
12032 p = strchr(xxreadtoken_chars, c);
12034 break; /* return readtoken1(...) */
12036 if ((int)(p - xxreadtoken_chars) >= xxreadtoken_singles) {
12038 if (cc == c) { /* double occurrence? */
12039 p += xxreadtoken_doubles + 1;
12042 #if ENABLE_ASH_BASH_COMPAT
12043 if (c == '&' && cc == '>') /* &> */
12044 break; /* return readtoken1(...) */
12049 lasttoken = xxreadtoken_tokens[p - xxreadtoken_chars];
12054 return readtoken1(c, BASESYNTAX, (char *) NULL, 0);
12056 #else /* old xxreadtoken */
12057 #define RETURN(token) return lasttoken = token
12067 setprompt_if(needprompt, 2);
12068 startlinno = g_parsefile->linno;
12069 for (;;) { /* until token or start of word found */
12072 case ' ': case '\t':
12073 IF_ASH_ALIAS(case PEOA:)
12076 while ((c = pgetc()) != '\n' && c != PEOF)
12081 if (pgetc() == '\n') {
12093 if (pgetc() == '&')
12098 if (pgetc() == '|')
12103 if (pgetc() == ';')
12116 return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
12119 #endif /* old xxreadtoken */
12125 int kwd = checkkwd;
12127 smallint alreadyseen = tokpushback;
12130 #if ENABLE_ASH_ALIAS
12146 if (t != TWORD || quoteflag) {
12151 * check for keywords
12153 if (kwd & CHKKWD) {
12154 const char *const *pp;
12156 pp = findkwd(wordtext);
12158 lasttoken = t = pp - tokname_array;
12159 TRACE(("keyword '%s' recognized\n", tokname_array[t]));
12164 if (checkkwd & CHKALIAS) {
12165 #if ENABLE_ASH_ALIAS
12167 ap = lookupalias(wordtext, 1);
12170 pushstring(ap->val, ap);
12180 TRACE(("token '%s' %s\n", tokname_array[t], t == TWORD ? wordtext : ""));
12182 TRACE(("reread token '%s' %s\n", tokname_array[t], t == TWORD ? wordtext : ""));
12198 * Read and parse a command. Returns NODE_EOF on end of file.
12199 * (NULL is a valid parse tree indicating a blank line.)
12201 static union node *
12202 parsecmd(int interact)
12207 doprompt = interact;
12208 setprompt_if(doprompt, doprompt);
12214 * Input any here documents.
12219 struct heredoc *here;
12222 here = heredoclist;
12223 heredoclist = NULL;
12226 setprompt_if(needprompt, 2);
12227 readtoken1(pgetc(), here->here->type == NHERE ? SQSYNTAX : DQSYNTAX,
12228 here->eofmark, here->striptabs);
12229 n = stzalloc(sizeof(struct narg));
12230 n->narg.type = NARG;
12231 /*n->narg.next = NULL; - stzalloc did it */
12232 n->narg.text = wordtext;
12233 n->narg.backquote = backquotelist;
12234 here->here->nhere.doc = n;
12241 * called by editline -- any expansions to the prompt should be added here.
12243 #if ENABLE_ASH_EXPAND_PRMT
12244 static const char *
12245 expandstr(const char *ps)
12250 /* XXX Fix (char *) cast. It _is_ a bug. ps is variable's value,
12251 * and token processing _can_ alter it (delete NULs etc). */
12252 setinputstring((char *)ps);
12254 saveprompt = doprompt;
12256 readtoken1(pgetc(), PSSYNTAX, nullstr, 0);
12257 doprompt = saveprompt;
12261 n.narg.type = NARG;
12262 n.narg.next = NULL;
12263 n.narg.text = wordtext;
12264 n.narg.backquote = backquotelist;
12266 expandarg(&n, NULL, EXP_QUOTED);
12267 return stackblock();
12272 * Execute a command or commands contained in a string.
12275 evalstring(char *s, int flags)
12278 struct stackmark smark;
12283 setstackmark(&smark);
12286 while ((n = parsecmd(0)) != NODE_EOF) {
12289 i = evaltree(n, flags);
12292 popstackmark(&smark);
12296 popstackmark(&smark);
12304 * The eval command.
12306 static int FAST_FUNC
12307 evalcmd(int argc UNUSED_PARAM, char **argv, int flags)
12316 STARTSTACKSTR(concat);
12318 concat = stack_putstr(p, concat);
12322 STPUTC(' ', concat);
12324 STPUTC('\0', concat);
12325 p = grabstackstr(concat);
12327 return evalstring(p, flags & EV_TESTED);
12333 * Read and execute commands.
12334 * "Top" is nonzero for the top level command loop;
12335 * it turns on prompting if the shell is interactive.
12341 struct stackmark smark;
12346 TRACE(("cmdloop(%d) called\n", top));
12350 setstackmark(&smark);
12353 showjobs(SHOW_CHANGED|SHOW_STDERR);
12356 if (iflag && top) {
12360 n = parsecmd(inter);
12362 if (DEBUG > 2 && debug && (n != NODE_EOF))
12365 if (n == NODE_EOF) {
12366 if (!top || numeof >= 50)
12368 if (!stoppedjobs()) {
12371 out2str("\nUse \"exit\" to leave shell.\n");
12374 } else if (nflag == 0) {
12377 /* job_warning can only be 2,1,0. Here 2->1, 1/0->0 */
12380 i = evaltree(n, 0);
12384 popstackmark(&smark);
12388 evalskip &= ~SKIPFUNC;
12396 * Take commands from a file. To be compatible we should do a path
12397 * search for the file, which is necessary to find sub-commands.
12400 find_dot_file(char *name)
12403 const char *path = pathval();
12406 /* don't try this for absolute or relative paths */
12407 if (strchr(name, '/'))
12410 /* IIRC standards do not say whether . is to be searched.
12411 * And it is even smaller this way, making it unconditional for now:
12413 if (1) { /* ENABLE_ASH_BASH_COMPAT */
12418 while ((fullname = path_advance(&path, name)) != NULL) {
12420 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
12422 * Don't bother freeing here, since it will
12423 * be freed by the caller.
12427 if (fullname != name)
12428 stunalloc(fullname);
12431 /* not found in the PATH */
12432 ash_msg_and_raise_error("%s: not found", name);
12436 static int FAST_FUNC
12437 dotcmd(int argc_ UNUSED_PARAM, char **argv_ UNUSED_PARAM)
12439 /* "false; . empty_file; echo $?" should print 0, not 1: */
12443 struct strlist *sp;
12444 volatile struct shparam saveparam;
12446 for (sp = cmdenviron; sp; sp = sp->next)
12447 setvareq(ckstrdup(sp->text), VSTRFIXED | VTEXTFIXED);
12449 nextopt(nullstr); /* handle possible "--" */
12453 /* bash says: "bash: .: filename argument required" */
12454 return 2; /* bash compat */
12457 /* This aborts if file isn't found, which is POSIXly correct.
12458 * bash returns exitcode 1 instead.
12460 fullname = find_dot_file(argv[0]);
12462 if (argv[0]) { /* . FILE ARGS, ARGS exist */
12464 saveparam = shellparam;
12465 shellparam.malloced = 0;
12469 shellparam.nparam = argc;
12470 shellparam.p = argv;
12473 /* This aborts if file can't be opened, which is POSIXly correct.
12474 * bash returns exitcode 1 instead.
12476 setinputfile(fullname, INPUT_PUSH_FILE);
12477 commandname = fullname;
12478 status = cmdloop(0);
12482 freeparam(&shellparam);
12483 shellparam = saveparam;
12489 static int FAST_FUNC
12490 exitcmd(int argc UNUSED_PARAM, char **argv)
12495 exitstatus = number(argv[1]);
12496 raise_exception(EXEXIT);
12501 * Read a file containing shell functions.
12504 readcmdfile(char *name)
12506 setinputfile(name, INPUT_PUSH_FILE);
12512 /* ============ find_command inplementation */
12515 * Resolve a command name. If you change this routine, you may have to
12516 * change the shellexec routine as well.
12519 find_command(char *name, struct cmdentry *entry, int act, const char *path)
12521 struct tblentry *cmdp;
12528 struct builtincmd *bcmd;
12530 /* If name contains a slash, don't use PATH or hash table */
12531 if (strchr(name, '/') != NULL) {
12532 entry->u.index = -1;
12533 if (act & DO_ABS) {
12534 while (stat(name, &statb) < 0) {
12536 if (errno == EINTR)
12539 entry->cmdtype = CMDUNKNOWN;
12543 entry->cmdtype = CMDNORMAL;
12547 /* #if ENABLE_FEATURE_SH_STANDALONE... moved after builtin check */
12549 updatetbl = (path == pathval());
12552 if (strstr(path, "%builtin") != NULL)
12553 act |= DO_ALTBLTIN;
12556 /* If name is in the table, check answer will be ok */
12557 cmdp = cmdlookup(name, 0);
12558 if (cmdp != NULL) {
12561 switch (cmdp->cmdtype) {
12579 } else if (cmdp->rehash == 0)
12580 /* if not invalidated by cd, we're done */
12584 /* If %builtin not in path, check for builtin next */
12585 bcmd = find_builtin(name);
12587 if (IS_BUILTIN_REGULAR(bcmd))
12588 goto builtin_success;
12589 if (act & DO_ALTPATH) {
12590 if (!(act & DO_ALTBLTIN))
12591 goto builtin_success;
12592 } else if (builtinloc <= 0) {
12593 goto builtin_success;
12597 #if ENABLE_FEATURE_SH_STANDALONE
12599 int applet_no = find_applet_by_name(name);
12600 if (applet_no >= 0) {
12601 entry->cmdtype = CMDNORMAL;
12602 entry->u.index = -2 - applet_no;
12608 /* We have to search path. */
12609 prev = -1; /* where to start */
12610 if (cmdp && cmdp->rehash) { /* doing a rehash */
12611 if (cmdp->cmdtype == CMDBUILTIN)
12614 prev = cmdp->param.index;
12620 while ((fullname = path_advance(&path, name)) != NULL) {
12621 stunalloc(fullname);
12622 /* NB: code below will still use fullname
12623 * despite it being "unallocated" */
12626 if (prefix(pathopt, "builtin")) {
12628 goto builtin_success;
12631 if ((act & DO_NOFUNC)
12632 || !prefix(pathopt, "func")
12633 ) { /* ignore unimplemented options */
12637 /* if rehash, don't redo absolute path names */
12638 if (fullname[0] == '/' && idx <= prev) {
12641 TRACE(("searchexec \"%s\": no change\n", name));
12644 while (stat(fullname, &statb) < 0) {
12646 if (errno == EINTR)
12649 if (errno != ENOENT && errno != ENOTDIR)
12653 e = EACCES; /* if we fail, this will be the error */
12654 if (!S_ISREG(statb.st_mode))
12656 if (pathopt) { /* this is a %func directory */
12657 stalloc(strlen(fullname) + 1);
12658 /* NB: stalloc will return space pointed by fullname
12659 * (because we don't have any intervening allocations
12660 * between stunalloc above and this stalloc) */
12661 readcmdfile(fullname);
12662 cmdp = cmdlookup(name, 0);
12663 if (cmdp == NULL || cmdp->cmdtype != CMDFUNCTION)
12664 ash_msg_and_raise_error("%s not defined in %s", name, fullname);
12665 stunalloc(fullname);
12668 TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
12670 entry->cmdtype = CMDNORMAL;
12671 entry->u.index = idx;
12675 cmdp = cmdlookup(name, 1);
12676 cmdp->cmdtype = CMDNORMAL;
12677 cmdp->param.index = idx;
12682 /* We failed. If there was an entry for this command, delete it */
12683 if (cmdp && updatetbl)
12684 delete_cmd_entry();
12686 ash_msg("%s: %s", name, errmsg(e, "not found"));
12687 entry->cmdtype = CMDUNKNOWN;
12692 entry->cmdtype = CMDBUILTIN;
12693 entry->u.cmd = bcmd;
12697 cmdp = cmdlookup(name, 1);
12698 cmdp->cmdtype = CMDBUILTIN;
12699 cmdp->param.cmd = bcmd;
12703 entry->cmdtype = cmdp->cmdtype;
12704 entry->u = cmdp->param;
12709 * The trap builtin.
12711 static int FAST_FUNC
12712 trapcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12716 int signo, exitcode;
12721 for (signo = 0; signo < NSIG; signo++) {
12722 char *tr = trap_ptr[signo];
12724 /* note: bash adds "SIG", but only if invoked
12725 * as "bash". If called as "sh", or if set -o posix,
12726 * then it prints short signal names.
12727 * We are printing short names: */
12728 out1fmt("trap -- %s %s\n",
12730 get_signame(signo));
12731 /* trap_ptr != trap only if we are in special-cased `trap` code.
12732 * In this case, we will exit very soon, no need to free(). */
12733 /* if (trap_ptr != trap && tp[0]) */
12738 if (trap_ptr != trap) {
12751 signo = get_signum(*ap);
12753 /* Mimic bash message exactly */
12754 ash_msg("%s: invalid signal specification", *ap);
12760 if (LONE_DASH(action))
12763 action = ckstrdup(action);
12767 may_have_traps = 1;
12768 trap[signo] = action;
12779 /* ============ Builtins */
12781 #if ENABLE_ASH_HELP
12782 static int FAST_FUNC
12783 helpcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12789 "Built-in commands:\n"
12790 "------------------\n");
12791 for (col = 0, i = 0; i < ARRAY_SIZE(builtintab); i++) {
12792 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '),
12793 builtintab[i].name + 1);
12799 # if ENABLE_FEATURE_SH_STANDALONE
12801 const char *a = applet_names;
12803 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '), a);
12808 while (*a++ != '\0')
12813 newline_and_flush(stdout);
12814 return EXIT_SUCCESS;
12819 static int FAST_FUNC
12820 historycmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12822 show_history(line_input_state);
12823 return EXIT_SUCCESS;
12828 * The export and readonly commands.
12830 static int FAST_FUNC
12831 exportcmd(int argc UNUSED_PARAM, char **argv)
12841 /* "readonly" in bash accepts, but ignores -n.
12842 * We do the same: it saves a conditional in nextopt's param.
12845 while ((opt = nextopt("np")) != '\0') {
12847 flag_off = VEXPORT;
12850 if (argv[0][0] == 'r') {
12852 flag_off = 0; /* readonly ignores -n */
12854 flag_off = ~flag_off;
12856 /*if (opt_p_not_specified) - bash doesnt check this. Try "export -p NAME" */
12862 p = strchr(name, '=');
12866 vp = *findvar(hashvar(name), name);
12868 vp->flags = ((vp->flags | flag) & flag_off);
12872 setvar(name, p, (flag & flag_off));
12873 } while ((name = *++aptr) != NULL);
12878 /* No arguments. Show the list of exported or readonly vars.
12881 showvars(argv[0], flag, 0);
12886 * Delete a function if it exists.
12889 unsetfunc(const char *name)
12891 struct tblentry *cmdp;
12893 cmdp = cmdlookup(name, 0);
12894 if (cmdp != NULL && cmdp->cmdtype == CMDFUNCTION)
12895 delete_cmd_entry();
12899 * The unset builtin command. We unset the function before we unset the
12900 * variable to allow a function to be unset when there is a readonly variable
12901 * with the same name.
12903 static int FAST_FUNC
12904 unsetcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12911 while ((i = nextopt("vf")) != 0) {
12915 for (ap = argptr; *ap; ap++) {
12928 static const unsigned char timescmd_str[] ALIGN1 = {
12929 ' ', offsetof(struct tms, tms_utime),
12930 '\n', offsetof(struct tms, tms_stime),
12931 ' ', offsetof(struct tms, tms_cutime),
12932 '\n', offsetof(struct tms, tms_cstime),
12935 static int FAST_FUNC
12936 timescmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12938 unsigned long clk_tck, s, t;
12939 const unsigned char *p;
12942 clk_tck = bb_clk_tck();
12947 t = *(clock_t *)(((char *) &buf) + p[1]);
12950 out1fmt("%lum%lu.%03lus%c",
12952 (t * 1000) / clk_tck,
12960 #if ENABLE_SH_MATH_SUPPORT
12962 * The let builtin. Partially stolen from GNU Bash, the Bourne Again SHell.
12963 * Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
12965 * Copyright (C) 2003 Vladimir Oleynik <dzo@simtreas.ru>
12967 static int FAST_FUNC
12968 letcmd(int argc UNUSED_PARAM, char **argv)
12974 ash_msg_and_raise_error("expression expected");
12976 i = ash_arith(*argv);
12984 * The read builtin. Options:
12985 * -r Do not interpret '\' specially
12986 * -s Turn off echo (tty only)
12987 * -n NCHARS Read NCHARS max
12988 * -p PROMPT Display PROMPT on stderr (if input is from tty)
12989 * -t SECONDS Timeout after SECONDS (tty or pipe only)
12990 * -u FD Read from given FD instead of fd 0
12991 * This uses unbuffered input, which may be avoidable in some cases.
12992 * TODO: bash also has:
12993 * -a ARRAY Read into array[0],[1],etc
12994 * -d DELIM End on DELIM char, not newline
12995 * -e Use line editing (tty only)
12997 static int FAST_FUNC
12998 readcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
13000 char *opt_n = NULL;
13001 char *opt_p = NULL;
13002 char *opt_t = NULL;
13003 char *opt_u = NULL;
13004 int read_flags = 0;
13008 while ((i = nextopt("p:u:rt:n:s")) != '\0') {
13017 read_flags |= BUILTIN_READ_SILENT;
13023 read_flags |= BUILTIN_READ_RAW;
13033 /* "read -s" needs to save/restore termios, can't allow ^C
13034 * to jump out of it.
13037 r = shell_builtin_read(setvar0,
13039 bltinlookup("IFS"), /* can be NULL */
13048 if ((uintptr_t)r > 1)
13049 ash_msg_and_raise_error(r);
13051 return (uintptr_t)r;
13054 static int FAST_FUNC
13055 umaskcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
13057 static const char permuser[3] ALIGN1 = "ogu";
13060 int symbolic_mode = 0;
13062 while (nextopt("S") != '\0') {
13071 if (*argptr == NULL) {
13072 if (symbolic_mode) {
13073 char buf[sizeof(",u=rwx,g=rwx,o=rwx")];
13080 *p++ = permuser[i];
13082 /* mask is 0..0uuugggooo. i=2 selects uuu bits */
13083 if (!(mask & 0400)) *p++ = 'r';
13084 if (!(mask & 0200)) *p++ = 'w';
13085 if (!(mask & 0100)) *p++ = 'x';
13093 out1fmt("%04o\n", mask);
13096 char *modestr = *argptr;
13097 /* numeric umasks are taken as-is */
13098 /* symbolic umasks are inverted: "umask a=rx" calls umask(222) */
13099 if (!isdigit(modestr[0]))
13101 mask = bb_parse_mode(modestr, mask);
13102 if ((unsigned)mask > 0777) {
13103 ash_msg_and_raise_error("illegal mode: %s", modestr);
13105 if (!isdigit(modestr[0]))
13112 static int FAST_FUNC
13113 ulimitcmd(int argc UNUSED_PARAM, char **argv)
13115 return shell_builtin_ulimit(argv);
13118 /* ============ main() and helpers */
13121 * Called to exit the shell.
13130 #if ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
13131 save_history(line_input_state);
13133 status = exitstatus;
13134 TRACE(("pid %d, exitshell(%d)\n", getpid(), status));
13135 if (setjmp(loc.loc)) {
13136 if (exception_type == EXEXIT)
13137 status = exitstatus;
13140 exception_handler = &loc;
13146 /*free(p); - we'll exit soon */
13149 /* dash wraps setjobctl(0) in "if (setjmp(loc.loc) == 0) {...}".
13150 * our setjobctl(0) does not panic if tcsetpgrp fails inside it.
13153 flush_stdout_stderr();
13161 /* we will never free this */
13162 basepf.next_to_pgetc = basepf.buf = ckmalloc(IBUFSIZ);
13164 signal(SIGCHLD, SIG_DFL);
13165 /* bash re-enables SIGHUP which is SIG_IGNed on entry.
13166 * Try: "trap '' HUP; bash; echo RET" and type "kill -HUP $$"
13168 signal(SIGHUP, SIG_DFL);
13173 struct stat st1, st2;
13176 for (envp = environ; envp && *envp; envp++) {
13177 p = endofname(*envp);
13178 if (p != *envp && *p == '=') {
13179 setvareq(*envp, VEXPORT|VTEXTFIXED);
13183 setvareq((char*)defoptindvar, VTEXTFIXED);
13185 setvar0("PPID", utoa(getppid()));
13186 #if ENABLE_ASH_BASH_COMPAT
13187 p = lookupvar("SHLVL");
13188 setvar("SHLVL", utoa((p ? atoi(p) : 0) + 1), VEXPORT);
13189 if (!lookupvar("HOSTNAME")) {
13190 struct utsname uts;
13192 setvar0("HOSTNAME", uts.nodename);
13195 p = lookupvar("PWD");
13197 if (p[0] != '/' || stat(p, &st1) || stat(".", &st2)
13198 || st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino
13208 //usage:#define ash_trivial_usage
13209 //usage: "[-/+OPTIONS] [-/+o OPT]... [-c 'SCRIPT' [ARG0 [ARGS]] / FILE [ARGS]]"
13210 //usage:#define ash_full_usage "\n\n"
13211 //usage: "Unix shell interpreter"
13213 //usage:#if ENABLE_FEATURE_SH_IS_ASH
13214 //usage:# define sh_trivial_usage ash_trivial_usage
13215 //usage:# define sh_full_usage ash_full_usage
13217 //usage:#if ENABLE_FEATURE_BASH_IS_ASH
13218 //usage:# define bash_trivial_usage ash_trivial_usage
13219 //usage:# define bash_full_usage ash_full_usage
13223 * Process the shell command line arguments.
13226 procargs(char **argv)
13229 const char *xminusc;
13234 /* if (xargv[0]) - mmm, this is always true! */
13236 for (i = 0; i < NOPTS; i++)
13239 if (options(/*cmdline:*/ 1)) {
13240 /* it already printed err message */
13241 raise_exception(EXERROR);
13245 if (*xargv == NULL) {
13247 ash_msg_and_raise_error(bb_msg_requires_arg, "-c");
13250 if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
13254 for (i = 0; i < NOPTS; i++)
13255 if (optlist[i] == 2)
13260 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
13265 } else if (!sflag) {
13266 setinputfile(*xargv, 0);
13269 commandname = arg0;
13272 shellparam.p = xargv;
13273 #if ENABLE_ASH_GETOPTS
13274 shellparam.optind = 1;
13275 shellparam.optoff = -1;
13277 /* assert(shellparam.malloced == 0 && shellparam.nparam == 0); */
13279 shellparam.nparam++;
13286 * Read /etc/profile or .profile.
13289 read_profile(const char *name)
13291 if (setinputfile(name, INPUT_PUSH_FILE | INPUT_NOFILE_OK) < 0)
13298 * This routine is called when an error or an interrupt occurs in an
13299 * interactive shell and control is returned to the main command loop.
13307 /* from input.c: */
13308 g_parsefile->left_in_buffer = 0;
13309 g_parsefile->left_in_line = 0; /* clear input buffer */
13311 /* from parser.c: */
13314 /* from redir.c: */
13316 popredir(/*drop:*/ 0, /*restore:*/ 0);
13320 static short profile_buf[16384];
13321 extern int etext();
13325 * Main routine. We initialize things, parse the arguments, execute
13326 * profiles if we're a login shell, and then call cmdloop to execute
13327 * commands. The setjmp call sets up the location to jump to when an
13328 * exception occurs. When an exception occurs the variable "state"
13329 * is used to figure out how far we had gotten.
13331 int ash_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
13332 int ash_main(int argc UNUSED_PARAM, char **argv)
13334 const char *shinit;
13335 volatile smallint state;
13336 struct jmploc jmploc;
13337 struct stackmark smark;
13339 /* Initialize global data */
13343 #if ENABLE_ASH_ALIAS
13349 monitor(4, etext, profile_buf, sizeof(profile_buf), 50);
13352 #if ENABLE_FEATURE_EDITING
13353 line_input_state = new_line_input_t(FOR_SHELL | WITH_PATH_LOOKUP);
13356 if (setjmp(jmploc.loc)) {
13362 e = exception_type;
13364 if (e == EXEXIT || s == 0 || iflag == 0 || shlvl) {
13368 newline_and_flush(stderr);
13371 popstackmark(&smark);
13372 FORCE_INT_ON; /* enable interrupts */
13381 exception_handler = &jmploc;
13384 TRACE(("Shell args: "));
13385 trace_puts_args(argv);
13387 rootpid = getpid();
13390 setstackmark(&smark);
13393 if (argv[0] && argv[0][0] == '-')
13399 read_profile("/etc/profile");
13402 hp = lookupvar("HOME");
13404 hp = concat_path_file(hp, ".profile");
13413 getuid() == geteuid() && getgid() == getegid() &&
13417 shinit = lookupvar("ENV");
13418 if (shinit != NULL && *shinit != '\0') {
13419 read_profile(shinit);
13425 /* evalstring pushes parsefile stack.
13426 * Ensure we don't falsely claim that 0 (stdin)
13427 * is one of stacked source fds.
13428 * Testcase: ash -c 'exec 1>&0' must not complain. */
13429 // if (!sflag) g_parsefile->pf_fd = -1;
13430 // ^^ not necessary since now we special-case fd 0
13431 // in is_hidden_fd() to not be considered "hidden fd"
13432 evalstring(minusc, 0);
13435 if (sflag || minusc == NULL) {
13436 #if MAX_HISTORY > 0 && ENABLE_FEATURE_EDITING_SAVEHISTORY
13438 const char *hp = lookupvar("HISTFILE");
13440 hp = lookupvar("HOME");
13442 hp = concat_path_file(hp, ".ash_history");
13443 setvar0("HISTFILE", hp);
13445 hp = lookupvar("HISTFILE");
13449 line_input_state->hist_file = hp;
13450 # if ENABLE_FEATURE_SH_HISTFILESIZE
13451 hp = lookupvar("HISTFILESIZE");
13452 line_input_state->max_history = size_from_HISTFILESIZE(hp);
13456 state4: /* XXX ??? - why isn't this before the "if" statement */
13464 extern void _mcleanup(void);
13468 TRACE(("End of main reached\n"));
13475 * Copyright (c) 1989, 1991, 1993, 1994
13476 * The Regents of the University of California. All rights reserved.
13478 * This code is derived from software contributed to Berkeley by
13479 * Kenneth Almquist.
13481 * Redistribution and use in source and binary forms, with or without
13482 * modification, are permitted provided that the following conditions
13484 * 1. Redistributions of source code must retain the above copyright
13485 * notice, this list of conditions and the following disclaimer.
13486 * 2. Redistributions in binary form must reproduce the above copyright
13487 * notice, this list of conditions and the following disclaimer in the
13488 * documentation and/or other materials provided with the distribution.
13489 * 3. Neither the name of the University nor the names of its contributors
13490 * may be used to endorse or promote products derived from this software
13491 * without specific prior written permission.
13493 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
13494 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
13495 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
13496 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
13497 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
13498 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
13499 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
13500 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
13501 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
13502 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF