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 EXSHELLPROC 2 /* execute a shell procedure */
305 #define EXEXIT 4 /* exit the shell */
306 #define EXSIG 5 /* trapped signal in wait(1) */
309 char nullstr[1]; /* zero length string */
312 #define eflag optlist[0]
313 #define fflag optlist[1]
314 #define Iflag optlist[2]
315 #define iflag optlist[3]
316 #define mflag optlist[4]
317 #define nflag optlist[5]
318 #define sflag optlist[6]
319 #define xflag optlist[7]
320 #define vflag optlist[8]
321 #define Cflag optlist[9]
322 #define aflag optlist[10]
323 #define bflag optlist[11]
324 #define uflag optlist[12]
325 #define viflag optlist[13]
326 #if ENABLE_ASH_BASH_COMPAT
327 # define pipefail optlist[14]
332 # define nolog optlist[14 + ENABLE_ASH_BASH_COMPAT]
333 # define debug optlist[15 + ENABLE_ASH_BASH_COMPAT]
336 /* trap handler commands */
338 * Sigmode records the current value of the signal handlers for the various
339 * modes. A value of zero means that the current handler is not known.
340 * S_HARD_IGN indicates that the signal was ignored on entry to the shell.
342 char sigmode[NSIG - 1];
343 #define S_DFL 1 /* default signal handling (SIG_DFL) */
344 #define S_CATCH 2 /* signal is caught */
345 #define S_IGN 3 /* signal is ignored (SIG_IGN) */
346 #define S_HARD_IGN 4 /* signal is ignored permanently */
348 /* indicates specified signal received */
349 uint8_t gotsig[NSIG - 1]; /* offset by 1: "signal" 0 is meaningless */
350 uint8_t may_have_traps; /* 0: definitely no traps are set, 1: some traps may be set */
352 char **trap_ptr; /* used only by "trap hack" */
354 /* Rarely referenced stuff */
355 #if ENABLE_ASH_RANDOM_SUPPORT
358 pid_t backgndpid; /* pid of last background process */
360 extern struct globals_misc *const ash_ptr_to_globals_misc;
361 #define G_misc (*ash_ptr_to_globals_misc)
362 #define exitstatus (G_misc.exitstatus )
363 #define back_exitstatus (G_misc.back_exitstatus )
364 #define job_warning (G_misc.job_warning)
365 #define rootpid (G_misc.rootpid )
366 #define shlvl (G_misc.shlvl )
367 #define minusc (G_misc.minusc )
368 #define curdir (G_misc.curdir )
369 #define physdir (G_misc.physdir )
370 #define arg0 (G_misc.arg0 )
371 #define exception_handler (G_misc.exception_handler)
372 #define exception_type (G_misc.exception_type )
373 #define suppress_int (G_misc.suppress_int )
374 #define pending_int (G_misc.pending_int )
375 #define pending_sig (G_misc.pending_sig )
376 #define isloginsh (G_misc.isloginsh )
377 #define nullstr (G_misc.nullstr )
378 #define optlist (G_misc.optlist )
379 #define sigmode (G_misc.sigmode )
380 #define gotsig (G_misc.gotsig )
381 #define may_have_traps (G_misc.may_have_traps )
382 #define trap (G_misc.trap )
383 #define trap_ptr (G_misc.trap_ptr )
384 #define random_gen (G_misc.random_gen )
385 #define backgndpid (G_misc.backgndpid )
386 #define INIT_G_misc() do { \
387 (*(struct globals_misc**)&ash_ptr_to_globals_misc) = xzalloc(sizeof(G_misc)); \
395 /* ============ DEBUG */
397 static void trace_printf(const char *fmt, ...);
398 static void trace_vprintf(const char *fmt, va_list va);
399 # define TRACE(param) trace_printf param
400 # define TRACEV(param) trace_vprintf param
401 # define close(fd) do { \
403 if (close(dfd) < 0) \
404 bb_error_msg("bug on %d: closing %d(0x%x)", \
405 __LINE__, dfd, dfd); \
408 # define TRACE(param)
409 # define TRACEV(param)
413 /* ============ Utility functions */
414 #define is_name(c) ((c) == '_' || isalpha((unsigned char)(c)))
415 #define is_in_name(c) ((c) == '_' || isalnum((unsigned char)(c)))
418 isdigit_str9(const char *str)
420 int maxlen = 9 + 1; /* max 9 digits: 999999999 */
421 while (--maxlen && isdigit(*str))
423 return (*str == '\0');
427 var_end(const char *var)
436 /* ============ Interrupts / exceptions */
438 static void exitshell(void) NORETURN;
441 * These macros allow the user to suspend the handling of interrupt signals
442 * over a period of time. This is similar to SIGHOLD or to sigblock, but
443 * much more efficient and portable. (But hacking the kernel is so much
444 * more fun than worrying about efficiency and portability. :-))
446 #define INT_OFF do { \
452 * Called to raise an exception. Since C doesn't include exceptions, we
453 * just do a longjmp to the exception handler. The type of exception is
454 * stored in the global variable "exception_type".
456 static void raise_exception(int) NORETURN;
458 raise_exception(int e)
461 if (exception_handler == NULL)
466 longjmp(exception_handler->loc, 1);
469 #define raise_exception(e) do { \
470 TRACE(("raising exception %d on line %d\n", (e), __LINE__)); \
471 raise_exception(e); \
476 * Called when a SIGINT is received. (If the user specifies
477 * that SIGINT is to be trapped or ignored using the trap builtin, then
478 * this routine is not called.) Suppressint is nonzero when interrupts
479 * are held using the INT_OFF macro. (The test for iflag is just
480 * defensive programming.)
482 static void raise_interrupt(void) NORETURN;
484 raise_interrupt(void)
489 /* Signal is not automatically unmasked after it is raised,
490 * do it ourself - unmask all signals */
491 sigprocmask_allsigs(SIG_UNBLOCK);
492 /* pending_sig = 0; - now done in signal_handler() */
495 if (gotsig[SIGINT - 1] && !trap[SIGINT]) {
496 if (!(rootshell && iflag)) {
497 /* Kill ourself with SIGINT */
498 signal(SIGINT, SIG_DFL);
503 /* bash: ^C even on empty command line sets $? */
504 exitstatus = SIGINT + 128;
505 raise_exception(ex_type);
509 #define raise_interrupt() do { \
510 TRACE(("raising interrupt on line %d\n", __LINE__)); \
515 static IF_ASH_OPTIMIZE_FOR_SIZE(inline) void
519 if (--suppress_int == 0 && pending_int) {
523 #define INT_ON int_on()
524 static IF_ASH_OPTIMIZE_FOR_SIZE(inline) void
532 #define FORCE_INT_ON force_int_on()
534 #define SAVE_INT(v) ((v) = suppress_int)
536 #define RESTORE_INT(v) do { \
538 suppress_int = (v); \
539 if (suppress_int == 0 && pending_int) \
544 /* ============ Stdout/stderr output */
547 outstr(const char *p, FILE *file)
555 flush_stdout_stderr(void)
562 /* Was called outcslow(c,FILE*), but c was always '\n' */
564 newline_and_flush(FILE *dest)
572 static int out1fmt(const char *, ...) __attribute__((__format__(__printf__,1,2)));
574 out1fmt(const char *fmt, ...)
581 r = vprintf(fmt, ap);
587 static int fmtstr(char *, size_t, const char *, ...) __attribute__((__format__(__printf__,3,4)));
589 fmtstr(char *outbuf, size_t length, const char *fmt, ...)
596 ret = vsnprintf(outbuf, length, fmt, ap);
603 out1str(const char *p)
609 out2str(const char *p)
612 flush_stdout_stderr();
616 /* ============ Parser structures */
618 /* control characters in argument strings */
619 #define CTL_FIRST CTLESC
620 #define CTLESC ((unsigned char)'\201') /* escape next character */
621 #define CTLVAR ((unsigned char)'\202') /* variable defn */
622 #define CTLENDVAR ((unsigned char)'\203')
623 #define CTLBACKQ ((unsigned char)'\204')
624 #define CTLARI ((unsigned char)'\206') /* arithmetic expression */
625 #define CTLENDARI ((unsigned char)'\207')
626 #define CTLQUOTEMARK ((unsigned char)'\210')
627 #define CTL_LAST CTLQUOTEMARK
629 /* variable substitution byte (follows CTLVAR) */
630 #define VSTYPE 0x0f /* type of variable substitution */
631 #define VSNUL 0x10 /* colon--treat the empty string as unset */
633 /* values of VSTYPE field */
634 #define VSNORMAL 0x1 /* normal variable: $var or ${var} */
635 #define VSMINUS 0x2 /* ${var-text} */
636 #define VSPLUS 0x3 /* ${var+text} */
637 #define VSQUESTION 0x4 /* ${var?message} */
638 #define VSASSIGN 0x5 /* ${var=text} */
639 #define VSTRIMRIGHT 0x6 /* ${var%pattern} */
640 #define VSTRIMRIGHTMAX 0x7 /* ${var%%pattern} */
641 #define VSTRIMLEFT 0x8 /* ${var#pattern} */
642 #define VSTRIMLEFTMAX 0x9 /* ${var##pattern} */
643 #define VSLENGTH 0xa /* ${#var} */
644 #if ENABLE_ASH_BASH_COMPAT
645 #define VSSUBSTR 0xc /* ${var:position:length} */
646 #define VSREPLACE 0xd /* ${var/pattern/replacement} */
647 #define VSREPLACEALL 0xe /* ${var//pattern/replacement} */
650 static const char dolatstr[] ALIGN1 = {
651 CTLQUOTEMARK, CTLVAR, VSNORMAL, '@', '=', CTLQUOTEMARK, '\0'
653 #define DOLATSTRLEN 6
672 #if ENABLE_ASH_BASH_COMPAT
689 smallint type; /* Nxxxx */
692 union node *redirect;
697 smallint pipe_backgnd;
698 struct nodelist *cmdlist;
704 union node *redirect;
717 union node *elsepart;
744 struct nodelist *backquote;
747 /* nfile and ndup layout must match!
748 * NTOFD (>&fdnum) uses ndup structure, but we may discover mid-flight
749 * that it is actually NTO2 (>&file), and change its type.
766 char *_unused_expfname;
785 struct nredir nredir;
786 struct nbinary nbinary;
790 struct nclist nclist;
799 * NODE_EOF is returned by parsecmd when it encounters an end of file.
800 * It must be distinct from NULL.
802 #define NODE_EOF ((union node *) -1L)
805 struct nodelist *next;
818 freefunc(struct funcnode *f)
820 if (f && --f->count < 0)
825 /* ============ Debugging output */
829 static FILE *tracefile;
832 trace_printf(const char *fmt, ...)
839 fprintf(tracefile, "%u ", (int) time(NULL));
841 fprintf(tracefile, "[%u] ", (int) getpid());
843 fprintf(tracefile, "pending s:%d i:%d(supp:%d) ", pending_sig, pending_int, suppress_int);
845 vfprintf(tracefile, fmt, va);
850 trace_vprintf(const char *fmt, va_list va)
855 fprintf(tracefile, "%u ", (int) time(NULL));
857 fprintf(tracefile, "[%u] ", (int) getpid());
859 fprintf(tracefile, "pending s:%d i:%d(supp:%d) ", pending_sig, pending_int, suppress_int);
860 vfprintf(tracefile, fmt, va);
864 trace_puts(const char *s)
872 trace_puts_quoted(char *s)
879 putc('"', tracefile);
880 for (p = s; *p; p++) {
881 switch ((unsigned char)*p) {
882 case '\n': c = 'n'; goto backslash;
883 case '\t': c = 't'; goto backslash;
884 case '\r': c = 'r'; goto backslash;
885 case '\"': c = '\"'; goto backslash;
886 case '\\': c = '\\'; goto backslash;
887 case CTLESC: c = 'e'; goto backslash;
888 case CTLVAR: c = 'v'; goto backslash;
889 case CTLBACKQ: c = 'q'; goto backslash;
891 putc('\\', tracefile);
895 if (*p >= ' ' && *p <= '~')
898 putc('\\', tracefile);
899 putc((*p >> 6) & 03, tracefile);
900 putc((*p >> 3) & 07, tracefile);
901 putc(*p & 07, tracefile);
906 putc('"', tracefile);
910 trace_puts_args(char **ap)
917 trace_puts_quoted(*ap);
919 putc('\n', tracefile);
922 putc(' ', tracefile);
937 /* leave open because libedit might be using it */
940 strcpy(s, "./trace");
942 if (!freopen(s, "a", tracefile)) {
943 fprintf(stderr, "Can't re-open %s\n", s);
948 tracefile = fopen(s, "a");
949 if (tracefile == NULL) {
950 fprintf(stderr, "Can't open %s\n", s);
956 flags = fcntl(fileno(tracefile), F_GETFL);
958 fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND);
960 setlinebuf(tracefile);
961 fputs("\nTracing started.\n", tracefile);
965 indent(int amount, char *pfx, FILE *fp)
969 for (i = 0; i < amount; i++) {
970 if (pfx && i == amount - 1)
976 /* little circular references here... */
977 static void shtree(union node *n, int ind, char *pfx, FILE *fp);
980 sharg(union node *arg, FILE *fp)
983 struct nodelist *bqlist;
984 unsigned char subtype;
986 if (arg->type != NARG) {
987 out1fmt("<node type %d>\n", arg->type);
990 bqlist = arg->narg.backquote;
991 for (p = arg->narg.text; *p; p++) {
992 switch ((unsigned char)*p) {
1001 if (subtype == VSLENGTH)
1009 if (subtype & VSNUL)
1012 switch (subtype & VSTYPE) {
1038 case VSTRIMRIGHTMAX:
1045 out1fmt("<subtype %d>", subtype);
1054 shtree(bqlist->n, -1, NULL, fp);
1065 shcmd(union node *cmd, FILE *fp)
1073 for (np = cmd->ncmd.args; np; np = np->narg.next) {
1079 for (np = cmd->ncmd.redirect; np; np = np->nfile.next) {
1083 switch (np->nfile.type) {
1084 case NTO: s = ">>"+1; dftfd = 1; break;
1085 case NCLOBBER: s = ">|"; dftfd = 1; break;
1086 case NAPPEND: s = ">>"; dftfd = 1; break;
1087 #if ENABLE_ASH_BASH_COMPAT
1090 case NTOFD: s = ">&"; dftfd = 1; break;
1091 case NFROM: s = "<"; break;
1092 case NFROMFD: s = "<&"; break;
1093 case NFROMTO: s = "<>"; break;
1094 default: s = "*error*"; break;
1096 if (np->nfile.fd != dftfd)
1097 fprintf(fp, "%d", np->nfile.fd);
1099 if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) {
1100 fprintf(fp, "%d", np->ndup.dupfd);
1102 sharg(np->nfile.fname, fp);
1109 shtree(union node *n, int ind, char *pfx, FILE *fp)
1111 struct nodelist *lp;
1117 indent(ind, pfx, fp);
1119 if (n == NODE_EOF) {
1134 shtree(n->nbinary.ch1, ind, NULL, fp);
1137 shtree(n->nbinary.ch2, ind, NULL, fp);
1145 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
1146 shtree(lp->n, 0, NULL, fp);
1150 if (n->npipe.pipe_backgnd)
1156 fprintf(fp, "<node type %d>", n->type);
1164 showtree(union node *n)
1166 trace_puts("showtree called\n");
1167 shtree(n, 1, NULL, stderr);
1173 /* ============ Parser data */
1176 * ash_vmsg() needs parsefile->fd, hence parsefile definition is moved up.
1179 struct strlist *next;
1186 struct strpush *prev; /* preceding string on stack */
1188 int prev_left_in_line;
1189 #if ENABLE_ASH_ALIAS
1190 struct alias *ap; /* if push was associated with an alias */
1192 char *string; /* remember the string since it may change */
1194 /* Remember last two characters for pungetc. */
1197 /* Number of outstanding calls to pungetc. */
1202 struct parsefile *prev; /* preceding file on stack */
1203 int linno; /* current line */
1204 int pf_fd; /* file descriptor (or -1 if string) */
1205 int left_in_line; /* number of chars left in this line */
1206 int left_in_buffer; /* number of chars left in this buffer past the line */
1207 char *next_to_pgetc; /* next char in buffer */
1208 char *buf; /* input buffer */
1209 struct strpush *strpush; /* for pushing strings at this level */
1210 struct strpush basestrpush; /* so pushing one is fast */
1212 /* Remember last two characters for pungetc. */
1215 /* Number of outstanding calls to pungetc. */
1219 static struct parsefile basepf; /* top level input file */
1220 static struct parsefile *g_parsefile = &basepf; /* current input file */
1221 static int startlinno; /* line # where last token started */
1222 static char *commandname; /* currently executing command */
1223 static struct strlist *cmdenviron; /* environment for builtin command */
1226 /* ============ Message printing */
1229 ash_vmsg(const char *msg, va_list ap)
1231 fprintf(stderr, "%s: ", arg0);
1233 if (strcmp(arg0, commandname))
1234 fprintf(stderr, "%s: ", commandname);
1235 if (!iflag || g_parsefile->pf_fd > 0)
1236 fprintf(stderr, "line %d: ", startlinno);
1238 vfprintf(stderr, msg, ap);
1239 newline_and_flush(stderr);
1243 * Exverror is called to raise the error exception. If the second argument
1244 * is not NULL then error prints an error message using printf style
1245 * formatting. It then raises the error exception.
1247 static void ash_vmsg_and_raise(int, const char *, va_list) NORETURN;
1249 ash_vmsg_and_raise(int cond, const char *msg, va_list ap)
1253 TRACE(("ash_vmsg_and_raise(%d, \"", cond));
1255 TRACE(("\") pid=%d\n", getpid()));
1257 TRACE(("ash_vmsg_and_raise(%d, NULL) pid=%d\n", cond, getpid()));
1262 flush_stdout_stderr();
1263 raise_exception(cond);
1267 static void ash_msg_and_raise_error(const char *, ...) NORETURN;
1269 ash_msg_and_raise_error(const char *msg, ...)
1274 ash_vmsg_and_raise(EXERROR, msg, ap);
1279 static void raise_error_syntax(const char *) NORETURN;
1281 raise_error_syntax(const char *msg)
1283 ash_msg_and_raise_error("syntax error: %s", msg);
1287 static void ash_msg_and_raise(int, const char *, ...) NORETURN;
1289 ash_msg_and_raise(int cond, const char *msg, ...)
1294 ash_vmsg_and_raise(cond, msg, ap);
1300 * error/warning routines for external builtins
1303 ash_msg(const char *fmt, ...)
1313 * Return a string describing an error. The returned string may be a
1314 * pointer to a static buffer that will be overwritten on the next call.
1315 * Action describes the operation that got the error.
1318 errmsg(int e, const char *em)
1320 if (e == ENOENT || e == ENOTDIR) {
1327 /* ============ Memory allocation */
1330 /* I consider these wrappers nearly useless:
1331 * ok, they return you to nearest exception handler, but
1332 * how much memory do you leak in the process, making
1333 * memory starvation worse?
1336 ckrealloc(void * p, size_t nbytes)
1338 p = realloc(p, nbytes);
1340 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1345 ckmalloc(size_t nbytes)
1347 return ckrealloc(NULL, nbytes);
1351 ckzalloc(size_t nbytes)
1353 return memset(ckmalloc(nbytes), 0, nbytes);
1357 ckstrdup(const char *s)
1359 char *p = strdup(s);
1361 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1365 /* Using bbox equivalents. They exit if out of memory */
1366 # define ckrealloc xrealloc
1367 # define ckmalloc xmalloc
1368 # define ckzalloc xzalloc
1369 # define ckstrdup xstrdup
1373 * It appears that grabstackstr() will barf with such alignments
1374 * because stalloc() will return a string allocated in a new stackblock.
1376 #define SHELL_ALIGN(nbytes) (((nbytes) + SHELL_SIZE) & ~SHELL_SIZE)
1378 /* Most machines require the value returned from malloc to be aligned
1379 * in some way. The following macro will get this right
1380 * on many machines. */
1381 SHELL_SIZE = sizeof(union { int i; char *cp; double d; }) - 1,
1382 /* Minimum size of a block */
1383 MINSIZE = SHELL_ALIGN(504),
1386 struct stack_block {
1387 struct stack_block *prev;
1388 char space[MINSIZE];
1392 struct stack_block *stackp;
1398 struct globals_memstack {
1399 struct stack_block *g_stackp; // = &stackbase;
1400 char *g_stacknxt; // = stackbase.space;
1401 char *sstrend; // = stackbase.space + MINSIZE;
1402 size_t g_stacknleft; // = MINSIZE;
1403 int herefd; // = -1;
1404 struct stack_block stackbase;
1406 extern struct globals_memstack *const ash_ptr_to_globals_memstack;
1407 #define G_memstack (*ash_ptr_to_globals_memstack)
1408 #define g_stackp (G_memstack.g_stackp )
1409 #define g_stacknxt (G_memstack.g_stacknxt )
1410 #define sstrend (G_memstack.sstrend )
1411 #define g_stacknleft (G_memstack.g_stacknleft)
1412 #define herefd (G_memstack.herefd )
1413 #define stackbase (G_memstack.stackbase )
1414 #define INIT_G_memstack() do { \
1415 (*(struct globals_memstack**)&ash_ptr_to_globals_memstack) = xzalloc(sizeof(G_memstack)); \
1417 g_stackp = &stackbase; \
1418 g_stacknxt = stackbase.space; \
1419 g_stacknleft = MINSIZE; \
1420 sstrend = stackbase.space + MINSIZE; \
1425 #define stackblock() ((void *)g_stacknxt)
1426 #define stackblocksize() g_stacknleft
1429 * Parse trees for commands are allocated in lifo order, so we use a stack
1430 * to make this more efficient, and also to avoid all sorts of exception
1431 * handling code to handle interrupts in the middle of a parse.
1433 * The size 504 was chosen because the Ultrix malloc handles that size
1437 stalloc(size_t nbytes)
1442 aligned = SHELL_ALIGN(nbytes);
1443 if (aligned > g_stacknleft) {
1446 struct stack_block *sp;
1448 blocksize = aligned;
1449 if (blocksize < MINSIZE)
1450 blocksize = MINSIZE;
1451 len = sizeof(struct stack_block) - MINSIZE + blocksize;
1452 if (len < blocksize)
1453 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1456 sp->prev = g_stackp;
1457 g_stacknxt = sp->space;
1458 g_stacknleft = blocksize;
1459 sstrend = g_stacknxt + blocksize;
1464 g_stacknxt += aligned;
1465 g_stacknleft -= aligned;
1470 stzalloc(size_t nbytes)
1472 return memset(stalloc(nbytes), 0, nbytes);
1479 if (!p || (g_stacknxt < (char *)p) || ((char *)p < g_stackp->space)) {
1480 write(STDERR_FILENO, "stunalloc\n", 10);
1484 g_stacknleft += g_stacknxt - (char *)p;
1489 * Like strdup but works with the ash stack.
1492 sstrdup(const char *p)
1494 size_t len = strlen(p) + 1;
1495 return memcpy(stalloc(len), p, len);
1499 grabstackblock(size_t len)
1501 len = SHELL_ALIGN(len);
1503 g_stacknleft -= len;
1507 pushstackmark(struct stackmark *mark, size_t len)
1509 mark->stackp = g_stackp;
1510 mark->stacknxt = g_stacknxt;
1511 mark->stacknleft = g_stacknleft;
1512 grabstackblock(len);
1516 setstackmark(struct stackmark *mark)
1518 pushstackmark(mark, g_stacknxt == g_stackp->space && g_stackp != &stackbase);
1522 popstackmark(struct stackmark *mark)
1524 struct stack_block *sp;
1530 while (g_stackp != mark->stackp) {
1532 g_stackp = sp->prev;
1535 g_stacknxt = mark->stacknxt;
1536 g_stacknleft = mark->stacknleft;
1537 sstrend = mark->stacknxt + mark->stacknleft;
1542 * When the parser reads in a string, it wants to stick the string on the
1543 * stack and only adjust the stack pointer when it knows how big the
1544 * string is. Stackblock (defined in stack.h) returns a pointer to a block
1545 * of space on top of the stack and stackblocklen returns the length of
1546 * this block. Growstackblock will grow this space by at least one byte,
1547 * possibly moving it (like realloc). Grabstackblock actually allocates the
1548 * part of the block that has been used.
1551 growstackblock(void)
1555 newlen = g_stacknleft * 2;
1556 if (newlen < g_stacknleft)
1557 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1561 if (g_stacknxt == g_stackp->space && g_stackp != &stackbase) {
1562 struct stack_block *sp;
1563 struct stack_block *prevstackp;
1568 prevstackp = sp->prev;
1569 grosslen = newlen + sizeof(struct stack_block) - MINSIZE;
1570 sp = ckrealloc(sp, grosslen);
1571 sp->prev = prevstackp;
1573 g_stacknxt = sp->space;
1574 g_stacknleft = newlen;
1575 sstrend = sp->space + newlen;
1578 char *oldspace = g_stacknxt;
1579 size_t oldlen = g_stacknleft;
1580 char *p = stalloc(newlen);
1582 /* free the space we just allocated */
1583 g_stacknxt = memcpy(p, oldspace, oldlen);
1584 g_stacknleft += newlen;
1589 * The following routines are somewhat easier to use than the above.
1590 * The user declares a variable of type STACKSTR, which may be declared
1591 * to be a register. The macro STARTSTACKSTR initializes things. Then
1592 * the user uses the macro STPUTC to add characters to the string. In
1593 * effect, STPUTC(c, p) is the same as *p++ = c except that the stack is
1594 * grown as necessary. When the user is done, she can just leave the
1595 * string there and refer to it using stackblock(). Or she can allocate
1596 * the space for it using grabstackstr(). If it is necessary to allow
1597 * someone else to use the stack temporarily and then continue to grow
1598 * the string, the user should use grabstack to allocate the space, and
1599 * then call ungrabstr(p) to return to the previous mode of operation.
1601 * USTPUTC is like STPUTC except that it doesn't check for overflow.
1602 * CHECKSTACKSPACE can be called before USTPUTC to ensure that there
1603 * is space for at least one character.
1608 size_t len = stackblocksize();
1609 if (herefd >= 0 && len >= 1024) {
1610 full_write(herefd, stackblock(), len);
1611 return stackblock();
1614 return (char *)stackblock() + len;
1618 * Called from CHECKSTRSPACE.
1621 makestrspace(size_t newlen, char *p)
1623 size_t len = p - g_stacknxt;
1629 size = stackblocksize();
1631 if (nleft >= newlen)
1635 return (char *)stackblock() + len;
1639 stack_nputstr(const char *s, size_t n, char *p)
1641 p = makestrspace(n, p);
1642 p = (char *)memcpy(p, s, n) + n;
1647 stack_putstr(const char *s, char *p)
1649 return stack_nputstr(s, strlen(s), p);
1653 _STPUTC(int c, char *p)
1661 #define STARTSTACKSTR(p) ((p) = stackblock())
1662 #define STPUTC(c, p) ((p) = _STPUTC((c), (p)))
1663 #define CHECKSTRSPACE(n, p) do { \
1666 size_t m = sstrend - q; \
1668 (p) = makestrspace(l, q); \
1670 #define USTPUTC(c, p) (*(p)++ = (c))
1671 #define STACKSTRNUL(p) do { \
1672 if ((p) == sstrend) \
1673 (p) = growstackstr(); \
1676 #define STUNPUTC(p) (--(p))
1677 #define STTOPC(p) ((p)[-1])
1678 #define STADJUST(amount, p) ((p) += (amount))
1680 #define grabstackstr(p) stalloc((char *)(p) - (char *)stackblock())
1681 #define ungrabstackstr(s, p) stunalloc(s)
1682 #define stackstrend() ((void *)sstrend)
1685 /* ============ String helpers */
1688 * prefix -- see if pfx is a prefix of string.
1691 prefix(const char *string, const char *pfx)
1694 if (*pfx++ != *string++)
1697 return (char *) string;
1701 * Check for a valid number. This should be elsewhere.
1704 is_number(const char *p)
1709 } while (*++p != '\0');
1714 * Convert a string of digits to an integer, printing an error message on
1718 number(const char *s)
1721 ash_msg_and_raise_error(msg_illnum, s);
1726 * Produce a possibly single quoted string suitable as input to the shell.
1727 * The return string is allocated on the stack.
1730 single_quote(const char *s)
1740 len = strchrnul(s, '\'') - s;
1742 q = p = makestrspace(len + 3, p);
1745 q = (char *)memcpy(q, s, len) + len;
1754 do len++; while (*++s == '\'');
1756 q = p = makestrspace(len + 3, p);
1759 q = (char *)memcpy(q, s - len, len) + len;
1767 return stackblock();
1771 /* ============ nextopt */
1773 static char **argptr; /* argument list for builtin commands */
1774 static char *optionarg; /* set by nextopt (like getopt) */
1775 static char *optptr; /* used by nextopt */
1778 * XXX - should get rid of. Have all builtins use getopt(3).
1779 * The library getopt must have the BSD extension static variable
1780 * "optreset", otherwise it can't be used within the shell safely.
1782 * Standard option processing (a la getopt) for builtin routines.
1783 * The only argument that is passed to nextopt is the option string;
1784 * the other arguments are unnecessary. It returns the character,
1785 * or '\0' on end of input.
1788 nextopt(const char *optstring)
1795 if (p == NULL || *p == '\0') {
1796 /* We ate entire "-param", take next one */
1802 if (*++p == '\0') /* just "-" ? */
1805 if (LONE_DASH(p)) /* "--" ? */
1807 /* p => next "-param" */
1809 /* p => some option char in the middle of a "-param" */
1811 for (q = optstring; *q != c;) {
1813 ash_msg_and_raise_error("illegal option -%c", c);
1821 ash_msg_and_raise_error("no arg for -%c option", c);
1831 /* ============ Shell variables */
1834 * The parsefile structure pointed to by the global variable parsefile
1835 * contains information about the current file being read.
1838 int nparam; /* # of positional parameters (without $0) */
1839 #if ENABLE_ASH_GETOPTS
1840 int optind; /* next parameter to be processed by getopts */
1841 int optoff; /* used by getopts */
1843 unsigned char malloced; /* if parameter list dynamically allocated */
1844 char **p; /* parameter list */
1848 * Free the list of positional parameters.
1851 freeparam(volatile struct shparam *param)
1853 if (param->malloced) {
1855 ap = ap1 = param->p;
1862 #if ENABLE_ASH_GETOPTS
1863 static void FAST_FUNC getoptsreset(const char *value);
1867 struct var *next; /* next entry in hash list */
1868 int flags; /* flags are defined above */
1869 const char *var_text; /* name=value */
1870 void (*var_func)(const char *) FAST_FUNC; /* function to be called when */
1871 /* the variable gets set/unset */
1875 struct localvar *next; /* next local variable in list */
1876 struct var *vp; /* the variable that was made local */
1877 int flags; /* saved flags */
1878 const char *text; /* saved text */
1882 #define VEXPORT 0x01 /* variable is exported */
1883 #define VREADONLY 0x02 /* variable cannot be modified */
1884 #define VSTRFIXED 0x04 /* variable struct is statically allocated */
1885 #define VTEXTFIXED 0x08 /* text is statically allocated */
1886 #define VSTACK 0x10 /* text is allocated on the stack */
1887 #define VUNSET 0x20 /* the variable is not set */
1888 #define VNOFUNC 0x40 /* don't call the callback function */
1889 #define VNOSET 0x80 /* do not set variable - just readonly test */
1890 #define VNOSAVE 0x100 /* when text is on the heap before setvareq */
1891 #if ENABLE_ASH_RANDOM_SUPPORT
1892 # define VDYNAMIC 0x200 /* dynamic variable */
1898 /* Need to be before varinit_data[] */
1899 #if ENABLE_LOCALE_SUPPORT
1900 static void FAST_FUNC
1901 change_lc_all(const char *value)
1903 if (value && *value != '\0')
1904 setlocale(LC_ALL, value);
1906 static void FAST_FUNC
1907 change_lc_ctype(const char *value)
1909 if (value && *value != '\0')
1910 setlocale(LC_CTYPE, value);
1914 static void chkmail(void);
1915 static void changemail(const char *var_value) FAST_FUNC;
1917 # define chkmail() ((void)0)
1919 static void changepath(const char *) FAST_FUNC;
1920 #if ENABLE_ASH_RANDOM_SUPPORT
1921 static void change_random(const char *) FAST_FUNC;
1924 static const struct {
1926 const char *var_text;
1927 void (*var_func)(const char *) FAST_FUNC;
1928 } varinit_data[] = {
1930 * Note: VEXPORT would not work correctly here for NOFORK applets:
1931 * some environment strings may be constant.
1933 { VSTRFIXED|VTEXTFIXED , defifsvar , NULL },
1935 { VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL" , changemail },
1936 { VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH" , changemail },
1938 { VSTRFIXED|VTEXTFIXED , bb_PATH_root_path, changepath },
1939 { VSTRFIXED|VTEXTFIXED , "PS1=$ " , NULL },
1940 { VSTRFIXED|VTEXTFIXED , "PS2=> " , NULL },
1941 { VSTRFIXED|VTEXTFIXED , "PS4=+ " , NULL },
1942 #if ENABLE_ASH_GETOPTS
1943 { VSTRFIXED|VTEXTFIXED , defoptindvar, getoptsreset },
1945 #if ENABLE_ASH_RANDOM_SUPPORT
1946 { VSTRFIXED|VTEXTFIXED|VUNSET|VDYNAMIC, "RANDOM", change_random },
1948 #if ENABLE_LOCALE_SUPPORT
1949 { VSTRFIXED|VTEXTFIXED|VUNSET, "LC_ALL" , change_lc_all },
1950 { VSTRFIXED|VTEXTFIXED|VUNSET, "LC_CTYPE" , change_lc_ctype },
1952 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
1953 { VSTRFIXED|VTEXTFIXED|VUNSET, "HISTFILE" , NULL },
1959 struct globals_var {
1960 struct shparam shellparam; /* $@ current positional parameters */
1961 struct redirtab *redirlist;
1963 int preverrout_fd; /* save fd2 before print debug if xflag is set. */
1964 struct var *vartab[VTABSIZE];
1965 struct var varinit[ARRAY_SIZE(varinit_data)];
1967 extern struct globals_var *const ash_ptr_to_globals_var;
1968 #define G_var (*ash_ptr_to_globals_var)
1969 #define shellparam (G_var.shellparam )
1970 //#define redirlist (G_var.redirlist )
1971 #define g_nullredirs (G_var.g_nullredirs )
1972 #define preverrout_fd (G_var.preverrout_fd)
1973 #define vartab (G_var.vartab )
1974 #define varinit (G_var.varinit )
1975 #define INIT_G_var() do { \
1977 (*(struct globals_var**)&ash_ptr_to_globals_var) = xzalloc(sizeof(G_var)); \
1979 for (i = 0; i < ARRAY_SIZE(varinit_data); i++) { \
1980 varinit[i].flags = varinit_data[i].flags; \
1981 varinit[i].var_text = varinit_data[i].var_text; \
1982 varinit[i].var_func = varinit_data[i].var_func; \
1986 #define vifs varinit[0]
1988 # define vmail (&vifs)[1]
1989 # define vmpath (&vmail)[1]
1990 # define vpath (&vmpath)[1]
1992 # define vpath (&vifs)[1]
1994 #define vps1 (&vpath)[1]
1995 #define vps2 (&vps1)[1]
1996 #define vps4 (&vps2)[1]
1997 #if ENABLE_ASH_GETOPTS
1998 # define voptind (&vps4)[1]
1999 # if ENABLE_ASH_RANDOM_SUPPORT
2000 # define vrandom (&voptind)[1]
2003 # if ENABLE_ASH_RANDOM_SUPPORT
2004 # define vrandom (&vps4)[1]
2009 * The following macros access the values of the above variables.
2010 * They have to skip over the name. They return the null string
2011 * for unset variables.
2013 #define ifsval() (vifs.var_text + 4)
2014 #define ifsset() ((vifs.flags & VUNSET) == 0)
2016 # define mailval() (vmail.var_text + 5)
2017 # define mpathval() (vmpath.var_text + 9)
2018 # define mpathset() ((vmpath.flags & VUNSET) == 0)
2020 #define pathval() (vpath.var_text + 5)
2021 #define ps1val() (vps1.var_text + 4)
2022 #define ps2val() (vps2.var_text + 4)
2023 #define ps4val() (vps4.var_text + 4)
2024 #if ENABLE_ASH_GETOPTS
2025 # define optindval() (voptind.var_text + 7)
2028 #if ENABLE_ASH_GETOPTS
2029 static void FAST_FUNC
2030 getoptsreset(const char *value)
2032 shellparam.optind = number(value);
2033 shellparam.optoff = -1;
2038 * Compares two strings up to the first = or '\0'. The first
2039 * string must be terminated by '='; the second may be terminated by
2040 * either '=' or '\0'.
2043 varcmp(const char *p, const char *q)
2047 while ((c = *p) == (d = *q)) {
2048 if (c == '\0' || c == '=')
2062 * Find the appropriate entry in the hash table from the name.
2064 static struct var **
2065 hashvar(const char *p)
2069 hashval = ((unsigned char) *p) << 4;
2070 while (*p && *p != '=')
2071 hashval += (unsigned char) *p++;
2072 return &vartab[hashval % VTABSIZE];
2076 vpcmp(const void *a, const void *b)
2078 return varcmp(*(const char **)a, *(const char **)b);
2082 * This routine initializes the builtin variables.
2092 * PS1 depends on uid
2094 #if ENABLE_FEATURE_EDITING && ENABLE_FEATURE_EDITING_FANCY_PROMPT
2095 vps1.var_text = "PS1=\\w \\$ ";
2098 vps1.var_text = "PS1=# ";
2101 end = vp + ARRAY_SIZE(varinit);
2103 vpp = hashvar(vp->var_text);
2106 } while (++vp < end);
2109 static struct var **
2110 findvar(struct var **vpp, const char *name)
2112 for (; *vpp; vpp = &(*vpp)->next) {
2113 if (varcmp((*vpp)->var_text, name) == 0) {
2121 * Find the value of a variable. Returns NULL if not set.
2123 static const char* FAST_FUNC
2124 lookupvar(const char *name)
2128 v = *findvar(hashvar(name), name);
2130 #if ENABLE_ASH_RANDOM_SUPPORT
2132 * Dynamic variables are implemented roughly the same way they are
2133 * in bash. Namely, they're "special" so long as they aren't unset.
2134 * As soon as they're unset, they're no longer dynamic, and dynamic
2135 * lookup will no longer happen at that point. -- PFM.
2137 if (v->flags & VDYNAMIC)
2140 if (!(v->flags & VUNSET))
2141 return var_end(v->var_text);
2147 reinit_unicode_for_ash(void)
2149 /* Unicode support should be activated even if LANG is set
2150 * _during_ shell execution, not only if it was set when
2151 * shell was started. Therefore, re-check LANG every time:
2153 if (ENABLE_FEATURE_CHECK_UNICODE_IN_ENV
2154 || ENABLE_UNICODE_USING_LOCALE
2156 const char *s = lookupvar("LC_ALL");
2157 if (!s) s = lookupvar("LC_CTYPE");
2158 if (!s) s = lookupvar("LANG");
2164 * Search the environment of a builtin command.
2167 bltinlookup(const char *name)
2171 for (sp = cmdenviron; sp; sp = sp->next) {
2172 if (varcmp(sp->text, name) == 0)
2173 return var_end(sp->text);
2175 return lookupvar(name);
2179 * Same as setvar except that the variable and value are passed in
2180 * the first argument as name=value. Since the first argument will
2181 * be actually stored in the table, it should not be a string that
2183 * Called with interrupts off.
2186 setvareq(char *s, int flags)
2188 struct var *vp, **vpp;
2191 flags |= (VEXPORT & (((unsigned) (1 - aflag)) - 1));
2192 vp = *findvar(vpp, s);
2194 if ((vp->flags & (VREADONLY|VDYNAMIC)) == VREADONLY) {
2197 if (flags & VNOSAVE)
2200 ash_msg_and_raise_error("%.*s: is read only", strchrnul(n, '=') - n, n);
2206 if (vp->var_func && !(flags & VNOFUNC))
2207 vp->var_func(var_end(s));
2209 if (!(vp->flags & (VTEXTFIXED|VSTACK)))
2210 free((char*)vp->var_text);
2212 flags |= vp->flags & ~(VTEXTFIXED|VSTACK|VNOSAVE|VUNSET);
2214 /* variable s is not found */
2217 vp = ckzalloc(sizeof(*vp));
2219 /*vp->func = NULL; - ckzalloc did it */
2222 if (!(flags & (VTEXTFIXED|VSTACK|VNOSAVE)))
2229 * Set the value of a variable. The flags argument is ored with the
2230 * flags of the variable. If val is NULL, the variable is unset.
2233 setvar(const char *name, const char *val, int flags)
2241 q = endofname(name);
2242 p = strchrnul(q, '=');
2244 if (!namelen || p != q)
2245 ash_msg_and_raise_error("%.*s: bad variable name", namelen, name);
2250 vallen = strlen(val);
2254 nameeq = ckmalloc(namelen + vallen + 2);
2255 p = memcpy(nameeq, name, namelen) + namelen;
2258 p = memcpy(p, val, vallen) + vallen;
2261 setvareq(nameeq, flags | VNOSAVE);
2265 static void FAST_FUNC
2266 setvar0(const char *name, const char *val)
2268 setvar(name, val, 0);
2271 #if ENABLE_ASH_GETOPTS
2273 * Safe version of setvar, returns 1 on success 0 on failure.
2276 setvarsafe(const char *name, const char *val, int flags)
2279 volatile int saveint;
2280 struct jmploc *volatile savehandler = exception_handler;
2281 struct jmploc jmploc;
2284 if (setjmp(jmploc.loc))
2287 exception_handler = &jmploc;
2288 setvar(name, val, flags);
2291 exception_handler = savehandler;
2292 RESTORE_INT(saveint);
2298 * Unset the specified variable.
2301 unsetvar(const char *s)
2307 vpp = findvar(hashvar(s), s);
2311 int flags = vp->flags;
2314 if (flags & VREADONLY)
2316 #if ENABLE_ASH_RANDOM_SUPPORT
2317 vp->flags &= ~VDYNAMIC;
2321 if ((flags & VSTRFIXED) == 0) {
2323 if ((flags & (VTEXTFIXED|VSTACK)) == 0)
2324 free((char*)vp->var_text);
2330 vp->flags &= ~VEXPORT;
2340 * Process a linked list of variable assignments.
2343 listsetvar(struct strlist *list_set_var, int flags)
2345 struct strlist *lp = list_set_var;
2351 setvareq(lp->text, flags);
2358 * Generate a list of variables satisfying the given conditions.
2361 listvars(int on, int off, char ***end)
2372 for (vp = *vpp; vp; vp = vp->next) {
2373 if ((vp->flags & mask) == on) {
2374 if (ep == stackstrend())
2375 ep = growstackstr();
2376 *ep++ = (char*)vp->var_text;
2379 } while (++vpp < vartab + VTABSIZE);
2380 if (ep == stackstrend())
2381 ep = growstackstr();
2385 return grabstackstr(ep);
2389 /* ============ Path search helper
2391 * The variable path (passed by reference) should be set to the start
2392 * of the path before the first call; path_advance will update
2393 * this value as it proceeds. Successive calls to path_advance will return
2394 * the possible path expansions in sequence. If an option (indicated by
2395 * a percent sign) appears in the path entry then the global variable
2396 * pathopt will be set to point to it; otherwise pathopt will be set to
2399 static const char *pathopt; /* set by path_advance */
2402 path_advance(const char **path, const char *name)
2412 for (p = start; *p && *p != ':' && *p != '%'; p++)
2414 len = p - start + strlen(name) + 2; /* "2" is for '/' and '\0' */
2415 while (stackblocksize() < len)
2419 memcpy(q, start, p - start);
2427 while (*p && *p != ':')
2434 return stalloc(len);
2438 /* ============ Prompt */
2440 static smallint doprompt; /* if set, prompt the user */
2441 static smallint needprompt; /* true if interactive and at start of line */
2443 #if ENABLE_FEATURE_EDITING
2444 static line_input_t *line_input_state;
2445 static const char *cmdedit_prompt;
2447 putprompt(const char *s)
2449 if (ENABLE_ASH_EXPAND_PRMT) {
2450 free((char*)cmdedit_prompt);
2451 cmdedit_prompt = ckstrdup(s);
2458 putprompt(const char *s)
2464 #if ENABLE_ASH_EXPAND_PRMT
2465 /* expandstr() needs parsing machinery, so it is far away ahead... */
2466 static const char *expandstr(const char *ps);
2468 #define expandstr(s) s
2472 setprompt_if(smallint do_set, int whichprompt)
2475 IF_ASH_EXPAND_PRMT(struct stackmark smark;)
2482 switch (whichprompt) {
2492 #if ENABLE_ASH_EXPAND_PRMT
2493 pushstackmark(&smark, stackblocksize());
2495 putprompt(expandstr(prompt));
2496 #if ENABLE_ASH_EXPAND_PRMT
2497 popstackmark(&smark);
2502 /* ============ The cd and pwd commands */
2504 #define CD_PHYSICAL 1
2514 while ((i = nextopt("LP")) != '\0') {
2516 flags ^= CD_PHYSICAL;
2525 * Update curdir (the name of the current directory) in response to a
2529 updatepwd(const char *dir)
2536 cdcomppath = sstrdup(dir);
2539 if (curdir == nullstr)
2541 new = stack_putstr(curdir, new);
2543 new = makestrspace(strlen(dir) + 2, new);
2544 lim = (char *)stackblock() + 1;
2548 if (new > lim && *lim == '/')
2553 if (dir[1] == '/' && dir[2] != '/') {
2559 p = strtok(cdcomppath, "/");
2563 if (p[1] == '.' && p[2] == '\0') {
2575 new = stack_putstr(p, new);
2578 p = strtok(NULL, "/");
2583 return stackblock();
2587 * Find out what the current directory is. If we already know the current
2588 * directory, this routine returns immediately.
2593 char *dir = getcwd(NULL, 0); /* huh, using glibc extension? */
2594 return dir ? dir : nullstr;
2598 setpwd(const char *val, int setold)
2602 oldcur = dir = curdir;
2605 setvar("OLDPWD", oldcur, VEXPORT);
2608 if (physdir != nullstr) {
2609 if (physdir != oldcur)
2613 if (oldcur == val || !val) {
2619 dir = ckstrdup(val);
2620 if (oldcur != dir && oldcur != nullstr) {
2625 setvar("PWD", dir, VEXPORT);
2628 static void hashcd(void);
2631 * Actually do the chdir. We also call hashcd to let the routines in exec.c
2632 * know that the current directory has changed.
2635 docd(const char *dest, int flags)
2637 const char *dir = NULL;
2640 TRACE(("docd(\"%s\", %d) called\n", dest, flags));
2643 if (!(flags & CD_PHYSICAL)) {
2644 dir = updatepwd(dest);
2658 static int FAST_FUNC
2659 cdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
2671 dest = bltinlookup("HOME");
2672 else if (LONE_DASH(dest)) {
2673 dest = bltinlookup("OLDPWD");
2695 path = bltinlookup("CDPATH");
2704 p = path_advance(&path, dest);
2705 if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
2709 if (!docd(p, flags))
2714 ash_msg_and_raise_error("can't cd to %s", dest);
2717 if (flags & CD_PRINT)
2718 out1fmt("%s\n", curdir);
2722 static int FAST_FUNC
2723 pwdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
2726 const char *dir = curdir;
2730 if (physdir == nullstr)
2734 out1fmt("%s\n", dir);
2739 /* ============ ... */
2742 #define IBUFSIZ (ENABLE_FEATURE_EDITING ? CONFIG_FEATURE_EDITING_MAX_LEN : 1024)
2744 /* Syntax classes */
2745 #define CWORD 0 /* character is nothing special */
2746 #define CNL 1 /* newline character */
2747 #define CBACK 2 /* a backslash character */
2748 #define CSQUOTE 3 /* single quote */
2749 #define CDQUOTE 4 /* double quote */
2750 #define CENDQUOTE 5 /* a terminating quote */
2751 #define CBQUOTE 6 /* backwards single quote */
2752 #define CVAR 7 /* a dollar sign */
2753 #define CENDVAR 8 /* a '}' character */
2754 #define CLP 9 /* a left paren in arithmetic */
2755 #define CRP 10 /* a right paren in arithmetic */
2756 #define CENDFILE 11 /* end of file */
2757 #define CCTL 12 /* like CWORD, except it must be escaped */
2758 #define CSPCL 13 /* these terminate a word */
2759 #define CIGN 14 /* character should be ignored */
2762 #if ENABLE_ASH_ALIAS
2766 #define USE_SIT_FUNCTION ENABLE_ASH_OPTIMIZE_FOR_SIZE
2768 #if ENABLE_SH_MATH_SUPPORT
2769 # define SIT_ITEM(a,b,c,d) (a | (b << 4) | (c << 8) | (d << 12))
2771 # define SIT_ITEM(a,b,c,d) (a | (b << 4) | (c << 8))
2773 static const uint16_t S_I_T[] ALIGN2 = {
2774 #if ENABLE_ASH_ALIAS
2775 SIT_ITEM(CSPCL , CIGN , CIGN , CIGN ), /* 0, PEOA */
2777 SIT_ITEM(CSPCL , CWORD , CWORD, CWORD ), /* 1, ' ' */
2778 SIT_ITEM(CNL , CNL , CNL , CNL ), /* 2, \n */
2779 SIT_ITEM(CWORD , CCTL , CCTL , CWORD ), /* 3, !*-/:=?[]~ */
2780 SIT_ITEM(CDQUOTE , CENDQUOTE, CWORD, CWORD ), /* 4, '"' */
2781 SIT_ITEM(CVAR , CVAR , CWORD, CVAR ), /* 5, $ */
2782 SIT_ITEM(CSQUOTE , CWORD , CENDQUOTE, CWORD), /* 6, "'" */
2783 SIT_ITEM(CSPCL , CWORD , CWORD, CLP ), /* 7, ( */
2784 SIT_ITEM(CSPCL , CWORD , CWORD, CRP ), /* 8, ) */
2785 SIT_ITEM(CBACK , CBACK , CCTL , CBACK ), /* 9, \ */
2786 SIT_ITEM(CBQUOTE , CBQUOTE , CWORD, CBQUOTE), /* 10, ` */
2787 SIT_ITEM(CENDVAR , CENDVAR , CWORD, CENDVAR), /* 11, } */
2788 #if !USE_SIT_FUNCTION
2789 SIT_ITEM(CENDFILE, CENDFILE , CENDFILE, CENDFILE),/* 12, PEOF */
2790 SIT_ITEM(CWORD , CWORD , CWORD, CWORD ), /* 13, 0-9A-Za-z */
2791 SIT_ITEM(CCTL , CCTL , CCTL , CCTL ) /* 14, CTLESC ... */
2795 /* Constants below must match table above */
2797 #if ENABLE_ASH_ALIAS
2798 CSPCL_CIGN_CIGN_CIGN , /* 0 */
2800 CSPCL_CWORD_CWORD_CWORD , /* 1 */
2801 CNL_CNL_CNL_CNL , /* 2 */
2802 CWORD_CCTL_CCTL_CWORD , /* 3 */
2803 CDQUOTE_CENDQUOTE_CWORD_CWORD , /* 4 */
2804 CVAR_CVAR_CWORD_CVAR , /* 5 */
2805 CSQUOTE_CWORD_CENDQUOTE_CWORD , /* 6 */
2806 CSPCL_CWORD_CWORD_CLP , /* 7 */
2807 CSPCL_CWORD_CWORD_CRP , /* 8 */
2808 CBACK_CBACK_CCTL_CBACK , /* 9 */
2809 CBQUOTE_CBQUOTE_CWORD_CBQUOTE , /* 10 */
2810 CENDVAR_CENDVAR_CWORD_CENDVAR , /* 11 */
2811 CENDFILE_CENDFILE_CENDFILE_CENDFILE, /* 12 */
2812 CWORD_CWORD_CWORD_CWORD , /* 13 */
2813 CCTL_CCTL_CCTL_CCTL , /* 14 */
2816 /* c in SIT(c, syntax) must be an *unsigned char* or PEOA or PEOF,
2817 * caller must ensure proper cast on it if c is *char_ptr!
2819 /* Values for syntax param */
2820 #define BASESYNTAX 0 /* not in quotes */
2821 #define DQSYNTAX 1 /* in double quotes */
2822 #define SQSYNTAX 2 /* in single quotes */
2823 #define ARISYNTAX 3 /* in arithmetic */
2824 #define PSSYNTAX 4 /* prompt. never passed to SIT() */
2826 #if USE_SIT_FUNCTION
2829 SIT(int c, int syntax)
2831 /* Used to also have '/' in this string: "\t\n !\"$&'()*-/:;<=>?[\\]`|}~" */
2832 static const char spec_symbls[] ALIGN1 = "\t\n !\"$&'()*-:;<=>?[\\]`|}~";
2834 * This causes '/' to be prepended with CTLESC in dquoted string,
2835 * making "./file"* treated incorrectly because we feed
2836 * ".\/file*" string to glob(), confusing it (see expandmeta func).
2837 * The "homegrown" glob implementation is okay with that,
2838 * but glibc one isn't. With '/' always treated as CWORD,
2841 # if ENABLE_ASH_ALIAS
2842 static const uint8_t syntax_index_table[] ALIGN1 = {
2843 1, 2, 1, 3, 4, 5, 1, 6, /* "\t\n !\"$&'" */
2844 7, 8, 3, 3,/*3,*/3, 1, 1, /* "()*-/:;<" */
2845 3, 1, 3, 3, 9, 3, 10, 1, /* "=>?[\\]`|" */
2849 static const uint8_t syntax_index_table[] ALIGN1 = {
2850 0, 1, 0, 2, 3, 4, 0, 5, /* "\t\n !\"$&'" */
2851 6, 7, 2, 2,/*2,*/2, 0, 0, /* "()*-/:;<" */
2852 2, 0, 2, 2, 8, 2, 9, 0, /* "=>?[\\]`|" */
2861 # if ENABLE_ASH_ALIAS
2867 /* Cast is purely for paranoia here,
2868 * just in case someone passed signed char to us */
2869 if ((unsigned char)c >= CTL_FIRST
2870 && (unsigned char)c <= CTL_LAST
2874 s = strchrnul(spec_symbls, c);
2877 indx = syntax_index_table[s - spec_symbls];
2879 return (S_I_T[indx] >> (syntax*4)) & 0xf;
2882 #else /* !USE_SIT_FUNCTION */
2884 static const uint8_t syntax_index_table[] ALIGN1 = {
2885 /* BASESYNTAX_DQSYNTAX_SQSYNTAX_ARISYNTAX */
2886 /* 0 */ CWORD_CWORD_CWORD_CWORD,
2887 /* 1 */ CWORD_CWORD_CWORD_CWORD,
2888 /* 2 */ CWORD_CWORD_CWORD_CWORD,
2889 /* 3 */ CWORD_CWORD_CWORD_CWORD,
2890 /* 4 */ CWORD_CWORD_CWORD_CWORD,
2891 /* 5 */ CWORD_CWORD_CWORD_CWORD,
2892 /* 6 */ CWORD_CWORD_CWORD_CWORD,
2893 /* 7 */ CWORD_CWORD_CWORD_CWORD,
2894 /* 8 */ CWORD_CWORD_CWORD_CWORD,
2895 /* 9 "\t" */ CSPCL_CWORD_CWORD_CWORD,
2896 /* 10 "\n" */ CNL_CNL_CNL_CNL,
2897 /* 11 */ CWORD_CWORD_CWORD_CWORD,
2898 /* 12 */ CWORD_CWORD_CWORD_CWORD,
2899 /* 13 */ CWORD_CWORD_CWORD_CWORD,
2900 /* 14 */ CWORD_CWORD_CWORD_CWORD,
2901 /* 15 */ CWORD_CWORD_CWORD_CWORD,
2902 /* 16 */ CWORD_CWORD_CWORD_CWORD,
2903 /* 17 */ CWORD_CWORD_CWORD_CWORD,
2904 /* 18 */ CWORD_CWORD_CWORD_CWORD,
2905 /* 19 */ CWORD_CWORD_CWORD_CWORD,
2906 /* 20 */ CWORD_CWORD_CWORD_CWORD,
2907 /* 21 */ CWORD_CWORD_CWORD_CWORD,
2908 /* 22 */ CWORD_CWORD_CWORD_CWORD,
2909 /* 23 */ CWORD_CWORD_CWORD_CWORD,
2910 /* 24 */ CWORD_CWORD_CWORD_CWORD,
2911 /* 25 */ CWORD_CWORD_CWORD_CWORD,
2912 /* 26 */ CWORD_CWORD_CWORD_CWORD,
2913 /* 27 */ CWORD_CWORD_CWORD_CWORD,
2914 /* 28 */ CWORD_CWORD_CWORD_CWORD,
2915 /* 29 */ CWORD_CWORD_CWORD_CWORD,
2916 /* 30 */ CWORD_CWORD_CWORD_CWORD,
2917 /* 31 */ CWORD_CWORD_CWORD_CWORD,
2918 /* 32 " " */ CSPCL_CWORD_CWORD_CWORD,
2919 /* 33 "!" */ CWORD_CCTL_CCTL_CWORD,
2920 /* 34 """ */ CDQUOTE_CENDQUOTE_CWORD_CWORD,
2921 /* 35 "#" */ CWORD_CWORD_CWORD_CWORD,
2922 /* 36 "$" */ CVAR_CVAR_CWORD_CVAR,
2923 /* 37 "%" */ CWORD_CWORD_CWORD_CWORD,
2924 /* 38 "&" */ CSPCL_CWORD_CWORD_CWORD,
2925 /* 39 "'" */ CSQUOTE_CWORD_CENDQUOTE_CWORD,
2926 /* 40 "(" */ CSPCL_CWORD_CWORD_CLP,
2927 /* 41 ")" */ CSPCL_CWORD_CWORD_CRP,
2928 /* 42 "*" */ CWORD_CCTL_CCTL_CWORD,
2929 /* 43 "+" */ CWORD_CWORD_CWORD_CWORD,
2930 /* 44 "," */ CWORD_CWORD_CWORD_CWORD,
2931 /* 45 "-" */ CWORD_CCTL_CCTL_CWORD,
2932 /* 46 "." */ CWORD_CWORD_CWORD_CWORD,
2933 /* "/" was CWORD_CCTL_CCTL_CWORD, see comment in SIT() function why this is changed: */
2934 /* 47 "/" */ CWORD_CWORD_CWORD_CWORD,
2935 /* 48 "0" */ CWORD_CWORD_CWORD_CWORD,
2936 /* 49 "1" */ CWORD_CWORD_CWORD_CWORD,
2937 /* 50 "2" */ CWORD_CWORD_CWORD_CWORD,
2938 /* 51 "3" */ CWORD_CWORD_CWORD_CWORD,
2939 /* 52 "4" */ CWORD_CWORD_CWORD_CWORD,
2940 /* 53 "5" */ CWORD_CWORD_CWORD_CWORD,
2941 /* 54 "6" */ CWORD_CWORD_CWORD_CWORD,
2942 /* 55 "7" */ CWORD_CWORD_CWORD_CWORD,
2943 /* 56 "8" */ CWORD_CWORD_CWORD_CWORD,
2944 /* 57 "9" */ CWORD_CWORD_CWORD_CWORD,
2945 /* 58 ":" */ CWORD_CCTL_CCTL_CWORD,
2946 /* 59 ";" */ CSPCL_CWORD_CWORD_CWORD,
2947 /* 60 "<" */ CSPCL_CWORD_CWORD_CWORD,
2948 /* 61 "=" */ CWORD_CCTL_CCTL_CWORD,
2949 /* 62 ">" */ CSPCL_CWORD_CWORD_CWORD,
2950 /* 63 "?" */ CWORD_CCTL_CCTL_CWORD,
2951 /* 64 "@" */ CWORD_CWORD_CWORD_CWORD,
2952 /* 65 "A" */ CWORD_CWORD_CWORD_CWORD,
2953 /* 66 "B" */ CWORD_CWORD_CWORD_CWORD,
2954 /* 67 "C" */ CWORD_CWORD_CWORD_CWORD,
2955 /* 68 "D" */ CWORD_CWORD_CWORD_CWORD,
2956 /* 69 "E" */ CWORD_CWORD_CWORD_CWORD,
2957 /* 70 "F" */ CWORD_CWORD_CWORD_CWORD,
2958 /* 71 "G" */ CWORD_CWORD_CWORD_CWORD,
2959 /* 72 "H" */ CWORD_CWORD_CWORD_CWORD,
2960 /* 73 "I" */ CWORD_CWORD_CWORD_CWORD,
2961 /* 74 "J" */ CWORD_CWORD_CWORD_CWORD,
2962 /* 75 "K" */ CWORD_CWORD_CWORD_CWORD,
2963 /* 76 "L" */ CWORD_CWORD_CWORD_CWORD,
2964 /* 77 "M" */ CWORD_CWORD_CWORD_CWORD,
2965 /* 78 "N" */ CWORD_CWORD_CWORD_CWORD,
2966 /* 79 "O" */ CWORD_CWORD_CWORD_CWORD,
2967 /* 80 "P" */ CWORD_CWORD_CWORD_CWORD,
2968 /* 81 "Q" */ CWORD_CWORD_CWORD_CWORD,
2969 /* 82 "R" */ CWORD_CWORD_CWORD_CWORD,
2970 /* 83 "S" */ CWORD_CWORD_CWORD_CWORD,
2971 /* 84 "T" */ CWORD_CWORD_CWORD_CWORD,
2972 /* 85 "U" */ CWORD_CWORD_CWORD_CWORD,
2973 /* 86 "V" */ CWORD_CWORD_CWORD_CWORD,
2974 /* 87 "W" */ CWORD_CWORD_CWORD_CWORD,
2975 /* 88 "X" */ CWORD_CWORD_CWORD_CWORD,
2976 /* 89 "Y" */ CWORD_CWORD_CWORD_CWORD,
2977 /* 90 "Z" */ CWORD_CWORD_CWORD_CWORD,
2978 /* 91 "[" */ CWORD_CCTL_CCTL_CWORD,
2979 /* 92 "\" */ CBACK_CBACK_CCTL_CBACK,
2980 /* 93 "]" */ CWORD_CCTL_CCTL_CWORD,
2981 /* 94 "^" */ CWORD_CWORD_CWORD_CWORD,
2982 /* 95 "_" */ CWORD_CWORD_CWORD_CWORD,
2983 /* 96 "`" */ CBQUOTE_CBQUOTE_CWORD_CBQUOTE,
2984 /* 97 "a" */ CWORD_CWORD_CWORD_CWORD,
2985 /* 98 "b" */ CWORD_CWORD_CWORD_CWORD,
2986 /* 99 "c" */ CWORD_CWORD_CWORD_CWORD,
2987 /* 100 "d" */ CWORD_CWORD_CWORD_CWORD,
2988 /* 101 "e" */ CWORD_CWORD_CWORD_CWORD,
2989 /* 102 "f" */ CWORD_CWORD_CWORD_CWORD,
2990 /* 103 "g" */ CWORD_CWORD_CWORD_CWORD,
2991 /* 104 "h" */ CWORD_CWORD_CWORD_CWORD,
2992 /* 105 "i" */ CWORD_CWORD_CWORD_CWORD,
2993 /* 106 "j" */ CWORD_CWORD_CWORD_CWORD,
2994 /* 107 "k" */ CWORD_CWORD_CWORD_CWORD,
2995 /* 108 "l" */ CWORD_CWORD_CWORD_CWORD,
2996 /* 109 "m" */ CWORD_CWORD_CWORD_CWORD,
2997 /* 110 "n" */ CWORD_CWORD_CWORD_CWORD,
2998 /* 111 "o" */ CWORD_CWORD_CWORD_CWORD,
2999 /* 112 "p" */ CWORD_CWORD_CWORD_CWORD,
3000 /* 113 "q" */ CWORD_CWORD_CWORD_CWORD,
3001 /* 114 "r" */ CWORD_CWORD_CWORD_CWORD,
3002 /* 115 "s" */ CWORD_CWORD_CWORD_CWORD,
3003 /* 116 "t" */ CWORD_CWORD_CWORD_CWORD,
3004 /* 117 "u" */ CWORD_CWORD_CWORD_CWORD,
3005 /* 118 "v" */ CWORD_CWORD_CWORD_CWORD,
3006 /* 119 "w" */ CWORD_CWORD_CWORD_CWORD,
3007 /* 120 "x" */ CWORD_CWORD_CWORD_CWORD,
3008 /* 121 "y" */ CWORD_CWORD_CWORD_CWORD,
3009 /* 122 "z" */ CWORD_CWORD_CWORD_CWORD,
3010 /* 123 "{" */ CWORD_CWORD_CWORD_CWORD,
3011 /* 124 "|" */ CSPCL_CWORD_CWORD_CWORD,
3012 /* 125 "}" */ CENDVAR_CENDVAR_CWORD_CENDVAR,
3013 /* 126 "~" */ CWORD_CCTL_CCTL_CWORD,
3014 /* 127 del */ CWORD_CWORD_CWORD_CWORD,
3015 /* 128 0x80 */ CWORD_CWORD_CWORD_CWORD,
3016 /* 129 CTLESC */ CCTL_CCTL_CCTL_CCTL,
3017 /* 130 CTLVAR */ CCTL_CCTL_CCTL_CCTL,
3018 /* 131 CTLENDVAR */ CCTL_CCTL_CCTL_CCTL,
3019 /* 132 CTLBACKQ */ CCTL_CCTL_CCTL_CCTL,
3020 /* 133 CTLQUOTE */ CCTL_CCTL_CCTL_CCTL,
3021 /* 134 CTLARI */ CCTL_CCTL_CCTL_CCTL,
3022 /* 135 CTLENDARI */ CCTL_CCTL_CCTL_CCTL,
3023 /* 136 CTLQUOTEMARK */ CCTL_CCTL_CCTL_CCTL,
3024 /* 137 */ CWORD_CWORD_CWORD_CWORD,
3025 /* 138 */ CWORD_CWORD_CWORD_CWORD,
3026 /* 139 */ CWORD_CWORD_CWORD_CWORD,
3027 /* 140 */ CWORD_CWORD_CWORD_CWORD,
3028 /* 141 */ CWORD_CWORD_CWORD_CWORD,
3029 /* 142 */ CWORD_CWORD_CWORD_CWORD,
3030 /* 143 */ CWORD_CWORD_CWORD_CWORD,
3031 /* 144 */ CWORD_CWORD_CWORD_CWORD,
3032 /* 145 */ CWORD_CWORD_CWORD_CWORD,
3033 /* 146 */ CWORD_CWORD_CWORD_CWORD,
3034 /* 147 */ CWORD_CWORD_CWORD_CWORD,
3035 /* 148 */ CWORD_CWORD_CWORD_CWORD,
3036 /* 149 */ CWORD_CWORD_CWORD_CWORD,
3037 /* 150 */ CWORD_CWORD_CWORD_CWORD,
3038 /* 151 */ CWORD_CWORD_CWORD_CWORD,
3039 /* 152 */ CWORD_CWORD_CWORD_CWORD,
3040 /* 153 */ CWORD_CWORD_CWORD_CWORD,
3041 /* 154 */ CWORD_CWORD_CWORD_CWORD,
3042 /* 155 */ CWORD_CWORD_CWORD_CWORD,
3043 /* 156 */ CWORD_CWORD_CWORD_CWORD,
3044 /* 157 */ CWORD_CWORD_CWORD_CWORD,
3045 /* 158 */ CWORD_CWORD_CWORD_CWORD,
3046 /* 159 */ CWORD_CWORD_CWORD_CWORD,
3047 /* 160 */ CWORD_CWORD_CWORD_CWORD,
3048 /* 161 */ CWORD_CWORD_CWORD_CWORD,
3049 /* 162 */ CWORD_CWORD_CWORD_CWORD,
3050 /* 163 */ CWORD_CWORD_CWORD_CWORD,
3051 /* 164 */ CWORD_CWORD_CWORD_CWORD,
3052 /* 165 */ CWORD_CWORD_CWORD_CWORD,
3053 /* 166 */ CWORD_CWORD_CWORD_CWORD,
3054 /* 167 */ CWORD_CWORD_CWORD_CWORD,
3055 /* 168 */ CWORD_CWORD_CWORD_CWORD,
3056 /* 169 */ CWORD_CWORD_CWORD_CWORD,
3057 /* 170 */ CWORD_CWORD_CWORD_CWORD,
3058 /* 171 */ CWORD_CWORD_CWORD_CWORD,
3059 /* 172 */ CWORD_CWORD_CWORD_CWORD,
3060 /* 173 */ CWORD_CWORD_CWORD_CWORD,
3061 /* 174 */ CWORD_CWORD_CWORD_CWORD,
3062 /* 175 */ CWORD_CWORD_CWORD_CWORD,
3063 /* 176 */ CWORD_CWORD_CWORD_CWORD,
3064 /* 177 */ CWORD_CWORD_CWORD_CWORD,
3065 /* 178 */ CWORD_CWORD_CWORD_CWORD,
3066 /* 179 */ CWORD_CWORD_CWORD_CWORD,
3067 /* 180 */ CWORD_CWORD_CWORD_CWORD,
3068 /* 181 */ CWORD_CWORD_CWORD_CWORD,
3069 /* 182 */ CWORD_CWORD_CWORD_CWORD,
3070 /* 183 */ CWORD_CWORD_CWORD_CWORD,
3071 /* 184 */ CWORD_CWORD_CWORD_CWORD,
3072 /* 185 */ CWORD_CWORD_CWORD_CWORD,
3073 /* 186 */ CWORD_CWORD_CWORD_CWORD,
3074 /* 187 */ CWORD_CWORD_CWORD_CWORD,
3075 /* 188 */ CWORD_CWORD_CWORD_CWORD,
3076 /* 189 */ CWORD_CWORD_CWORD_CWORD,
3077 /* 190 */ CWORD_CWORD_CWORD_CWORD,
3078 /* 191 */ CWORD_CWORD_CWORD_CWORD,
3079 /* 192 */ CWORD_CWORD_CWORD_CWORD,
3080 /* 193 */ CWORD_CWORD_CWORD_CWORD,
3081 /* 194 */ CWORD_CWORD_CWORD_CWORD,
3082 /* 195 */ CWORD_CWORD_CWORD_CWORD,
3083 /* 196 */ CWORD_CWORD_CWORD_CWORD,
3084 /* 197 */ CWORD_CWORD_CWORD_CWORD,
3085 /* 198 */ CWORD_CWORD_CWORD_CWORD,
3086 /* 199 */ CWORD_CWORD_CWORD_CWORD,
3087 /* 200 */ CWORD_CWORD_CWORD_CWORD,
3088 /* 201 */ CWORD_CWORD_CWORD_CWORD,
3089 /* 202 */ CWORD_CWORD_CWORD_CWORD,
3090 /* 203 */ CWORD_CWORD_CWORD_CWORD,
3091 /* 204 */ CWORD_CWORD_CWORD_CWORD,
3092 /* 205 */ CWORD_CWORD_CWORD_CWORD,
3093 /* 206 */ CWORD_CWORD_CWORD_CWORD,
3094 /* 207 */ CWORD_CWORD_CWORD_CWORD,
3095 /* 208 */ CWORD_CWORD_CWORD_CWORD,
3096 /* 209 */ CWORD_CWORD_CWORD_CWORD,
3097 /* 210 */ CWORD_CWORD_CWORD_CWORD,
3098 /* 211 */ CWORD_CWORD_CWORD_CWORD,
3099 /* 212 */ CWORD_CWORD_CWORD_CWORD,
3100 /* 213 */ CWORD_CWORD_CWORD_CWORD,
3101 /* 214 */ CWORD_CWORD_CWORD_CWORD,
3102 /* 215 */ CWORD_CWORD_CWORD_CWORD,
3103 /* 216 */ CWORD_CWORD_CWORD_CWORD,
3104 /* 217 */ CWORD_CWORD_CWORD_CWORD,
3105 /* 218 */ CWORD_CWORD_CWORD_CWORD,
3106 /* 219 */ CWORD_CWORD_CWORD_CWORD,
3107 /* 220 */ CWORD_CWORD_CWORD_CWORD,
3108 /* 221 */ CWORD_CWORD_CWORD_CWORD,
3109 /* 222 */ CWORD_CWORD_CWORD_CWORD,
3110 /* 223 */ CWORD_CWORD_CWORD_CWORD,
3111 /* 224 */ CWORD_CWORD_CWORD_CWORD,
3112 /* 225 */ CWORD_CWORD_CWORD_CWORD,
3113 /* 226 */ CWORD_CWORD_CWORD_CWORD,
3114 /* 227 */ CWORD_CWORD_CWORD_CWORD,
3115 /* 228 */ CWORD_CWORD_CWORD_CWORD,
3116 /* 229 */ CWORD_CWORD_CWORD_CWORD,
3117 /* 230 */ CWORD_CWORD_CWORD_CWORD,
3118 /* 231 */ CWORD_CWORD_CWORD_CWORD,
3119 /* 232 */ CWORD_CWORD_CWORD_CWORD,
3120 /* 233 */ CWORD_CWORD_CWORD_CWORD,
3121 /* 234 */ CWORD_CWORD_CWORD_CWORD,
3122 /* 235 */ CWORD_CWORD_CWORD_CWORD,
3123 /* 236 */ CWORD_CWORD_CWORD_CWORD,
3124 /* 237 */ CWORD_CWORD_CWORD_CWORD,
3125 /* 238 */ CWORD_CWORD_CWORD_CWORD,
3126 /* 239 */ CWORD_CWORD_CWORD_CWORD,
3127 /* 230 */ CWORD_CWORD_CWORD_CWORD,
3128 /* 241 */ CWORD_CWORD_CWORD_CWORD,
3129 /* 242 */ CWORD_CWORD_CWORD_CWORD,
3130 /* 243 */ CWORD_CWORD_CWORD_CWORD,
3131 /* 244 */ CWORD_CWORD_CWORD_CWORD,
3132 /* 245 */ CWORD_CWORD_CWORD_CWORD,
3133 /* 246 */ CWORD_CWORD_CWORD_CWORD,
3134 /* 247 */ CWORD_CWORD_CWORD_CWORD,
3135 /* 248 */ CWORD_CWORD_CWORD_CWORD,
3136 /* 249 */ CWORD_CWORD_CWORD_CWORD,
3137 /* 250 */ CWORD_CWORD_CWORD_CWORD,
3138 /* 251 */ CWORD_CWORD_CWORD_CWORD,
3139 /* 252 */ CWORD_CWORD_CWORD_CWORD,
3140 /* 253 */ CWORD_CWORD_CWORD_CWORD,
3141 /* 254 */ CWORD_CWORD_CWORD_CWORD,
3142 /* 255 */ CWORD_CWORD_CWORD_CWORD,
3143 /* PEOF */ CENDFILE_CENDFILE_CENDFILE_CENDFILE,
3144 # if ENABLE_ASH_ALIAS
3145 /* PEOA */ CSPCL_CIGN_CIGN_CIGN,
3149 # define SIT(c, syntax) ((S_I_T[syntax_index_table[c]] >> ((syntax)*4)) & 0xf)
3151 #endif /* !USE_SIT_FUNCTION */
3154 /* ============ Alias handling */
3156 #if ENABLE_ASH_ALIAS
3158 #define ALIASINUSE 1
3169 static struct alias **atab; // [ATABSIZE];
3170 #define INIT_G_alias() do { \
3171 atab = xzalloc(ATABSIZE * sizeof(atab[0])); \
3175 static struct alias **
3176 __lookupalias(const char *name)
3178 unsigned int hashval;
3185 ch = (unsigned char)*p;
3189 ch = (unsigned char)*++p;
3191 app = &atab[hashval % ATABSIZE];
3193 for (; *app; app = &(*app)->next) {
3194 if (strcmp(name, (*app)->name) == 0) {
3202 static struct alias *
3203 lookupalias(const char *name, int check)
3205 struct alias *ap = *__lookupalias(name);
3207 if (check && ap && (ap->flag & ALIASINUSE))
3212 static struct alias *
3213 freealias(struct alias *ap)
3217 if (ap->flag & ALIASINUSE) {
3218 ap->flag |= ALIASDEAD;
3230 setalias(const char *name, const char *val)
3232 struct alias *ap, **app;
3234 app = __lookupalias(name);
3238 if (!(ap->flag & ALIASINUSE)) {
3241 ap->val = ckstrdup(val);
3242 ap->flag &= ~ALIASDEAD;
3245 ap = ckzalloc(sizeof(struct alias));
3246 ap->name = ckstrdup(name);
3247 ap->val = ckstrdup(val);
3248 /*ap->flag = 0; - ckzalloc did it */
3249 /*ap->next = NULL;*/
3256 unalias(const char *name)
3260 app = __lookupalias(name);
3264 *app = freealias(*app);
3275 struct alias *ap, **app;
3279 for (i = 0; i < ATABSIZE; i++) {
3281 for (ap = *app; ap; ap = *app) {
3282 *app = freealias(*app);
3292 printalias(const struct alias *ap)
3294 out1fmt("%s=%s\n", ap->name, single_quote(ap->val));
3298 * TODO - sort output
3300 static int FAST_FUNC
3301 aliascmd(int argc UNUSED_PARAM, char **argv)
3310 for (i = 0; i < ATABSIZE; i++) {
3311 for (ap = atab[i]; ap; ap = ap->next) {
3317 while ((n = *++argv) != NULL) {
3318 v = strchr(n+1, '=');
3319 if (v == NULL) { /* n+1: funny ksh stuff */
3320 ap = *__lookupalias(n);
3322 fprintf(stderr, "%s: %s not found\n", "alias", n);
3335 static int FAST_FUNC
3336 unaliascmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
3340 while ((i = nextopt("a")) != '\0') {
3346 for (i = 0; *argptr; argptr++) {
3347 if (unalias(*argptr)) {
3348 fprintf(stderr, "%s: %s not found\n", "unalias", *argptr);
3356 #endif /* ASH_ALIAS */
3359 /* Mode argument to forkshell. Don't change FORK_FG or FORK_BG. */
3362 #define FORK_NOJOB 2
3364 /* mode flags for showjob(s) */
3365 #define SHOW_ONLY_PGID 0x01 /* show only pgid (jobs -p) */
3366 #define SHOW_PIDS 0x02 /* show individual pids, not just one line per job */
3367 #define SHOW_CHANGED 0x04 /* only jobs whose state has changed */
3368 #define SHOW_STDERR 0x08 /* print to stderr (else stdout) */
3371 * A job structure contains information about a job. A job is either a
3372 * single process or a set of processes contained in a pipeline. In the
3373 * latter case, pidlist will be non-NULL, and will point to a -1 terminated
3377 pid_t ps_pid; /* process id */
3378 int ps_status; /* last process status from wait() */
3379 char *ps_cmd; /* text of command being run */
3383 struct procstat ps0; /* status of process */
3384 struct procstat *ps; /* status or processes when more than one */
3386 int stopstatus; /* status of a stopped job */
3389 nprocs: 16, /* number of processes */
3391 #define JOBRUNNING 0 /* at least one proc running */
3392 #define JOBSTOPPED 1 /* all procs are stopped */
3393 #define JOBDONE 2 /* all procs are completed */
3395 sigint: 1, /* job was killed by SIGINT */
3396 jobctl: 1, /* job running under job control */
3398 waited: 1, /* true if this entry has been waited for */
3399 used: 1, /* true if this entry is in used */
3400 changed: 1; /* true if status has changed */
3401 struct job *prev_job; /* previous job */
3404 static struct job *makejob(/*union node *,*/ int);
3405 static int forkshell(struct job *, union node *, int);
3406 static int waitforjob(struct job *);
3409 enum { doing_jobctl = 0 };
3410 #define setjobctl(on) do {} while (0)
3412 static smallint doing_jobctl; //references:8
3413 static void setjobctl(int);
3420 ignoresig(int signo)
3422 /* Avoid unnecessary system calls. Is it already SIG_IGNed? */
3423 if (sigmode[signo - 1] != S_IGN && sigmode[signo - 1] != S_HARD_IGN) {
3424 /* No, need to do it */
3425 signal(signo, SIG_IGN);
3427 sigmode[signo - 1] = S_HARD_IGN;
3431 * Only one usage site - in setsignal()
3434 signal_handler(int signo)
3436 gotsig[signo - 1] = 1;
3438 if (signo == SIGINT && !trap[SIGINT]) {
3439 if (!suppress_int) {
3441 raise_interrupt(); /* does not return */
3445 pending_sig = signo;
3450 * Set the signal handler for the specified signal. The routine figures
3451 * out what it should be set to.
3454 setsignal(int signo)
3457 char cur_act, new_act;
3458 struct sigaction act;
3462 if (t != NULL) { /* trap for this sig is set */
3464 if (t[0] == '\0') /* trap is "": ignore this sig */
3468 if (rootshell && new_act == S_DFL) {
3471 if (iflag || minusc || sflag == 0)
3480 * "In all cases, bash ignores SIGQUIT. Non-builtin
3481 * commands run by bash have signal handlers
3482 * set to the values inherited by the shell
3483 * from its parent". */
3499 //TODO: if !rootshell, we reset SIGQUIT to DFL,
3500 //whereas we have to restore it to what shell got on entry
3501 //from the parent. See comment above
3503 t = &sigmode[signo - 1];
3506 /* current setting is not yet known */
3507 if (sigaction(signo, NULL, &act)) {
3508 /* pretend it worked; maybe we should give a warning,
3509 * but other shells don't. We don't alter sigmode,
3510 * so we retry every time.
3511 * btw, in Linux it never fails. --vda */
3514 if (act.sa_handler == SIG_IGN) {
3515 cur_act = S_HARD_IGN;
3517 && (signo == SIGTSTP || signo == SIGTTIN || signo == SIGTTOU)
3519 cur_act = S_IGN; /* don't hard ignore these */
3523 if (cur_act == S_HARD_IGN || cur_act == new_act)
3526 act.sa_handler = SIG_DFL;
3529 act.sa_handler = signal_handler;
3532 act.sa_handler = SIG_IGN;
3536 /* flags and mask matter only if !DFL and !IGN, but we do it
3537 * for all cases for more deterministic behavior:
3540 sigfillset(&act.sa_mask);
3542 sigaction_set(signo, &act);
3547 /* mode flags for set_curjob */
3548 #define CUR_DELETE 2
3549 #define CUR_RUNNING 1
3550 #define CUR_STOPPED 0
3552 /* mode flags for dowait */
3553 #define DOWAIT_NONBLOCK WNOHANG
3554 #define DOWAIT_BLOCK 0
3557 /* pgrp of shell on invocation */
3558 static int initialpgrp; //references:2
3559 static int ttyfd = -1; //5
3562 static struct job *jobtab; //5
3564 static unsigned njobs; //4
3566 static struct job *curjob; //lots
3567 /* number of presumed living untracked jobs */
3568 static int jobless; //4
3571 set_curjob(struct job *jp, unsigned mode)
3574 struct job **jpp, **curp;
3576 /* first remove from list */
3577 jpp = curp = &curjob;
3582 jpp = &jp1->prev_job;
3584 *jpp = jp1->prev_job;
3586 /* Then re-insert in correct position */
3594 /* job being deleted */
3597 /* newly created job or backgrounded job,
3598 * put after all stopped jobs.
3603 if (!jp1 || jp1->state != JOBSTOPPED)
3606 jpp = &jp1->prev_job;
3612 /* newly stopped job - becomes curjob */
3613 jp->prev_job = *jpp;
3621 jobno(const struct job *jp)
3623 return jp - jobtab + 1;
3628 * Convert a job name to a job structure.
3631 #define getjob(name, getctl) getjob(name)
3634 getjob(const char *name, int getctl)
3638 const char *err_msg = "%s: no such job";
3642 char *(*match)(const char *, const char *);
3657 if (c == '+' || c == '%') {
3659 err_msg = "No current job";
3665 err_msg = "No previous job";
3675 if (num > 0 && num <= njobs) {
3676 jp = jobtab + num - 1;
3691 if (match(jp->ps[0].ps_cmd, p)) {
3695 err_msg = "%s: ambiguous";
3705 err_msg = "job %s not created under job control";
3706 if (getctl && jp->jobctl == 0)
3711 ash_msg_and_raise_error(err_msg, name);
3715 * Mark a job structure as unused.
3718 freejob(struct job *jp)
3720 struct procstat *ps;
3724 for (i = jp->nprocs, ps = jp->ps; --i >= 0; ps++) {
3725 if (ps->ps_cmd != nullstr)
3728 if (jp->ps != &jp->ps0)
3731 set_curjob(jp, CUR_DELETE);
3737 xtcsetpgrp(int fd, pid_t pgrp)
3739 if (tcsetpgrp(fd, pgrp))
3740 ash_msg_and_raise_error("can't set tty process group (%m)");
3744 * Turn job control on and off.
3746 * Note: This code assumes that the third arg to ioctl is a character
3747 * pointer, which is true on Berkeley systems but not System V. Since
3748 * System V doesn't have job control yet, this isn't a problem now.
3750 * Called with interrupts off.
3758 if (on == doing_jobctl || rootshell == 0)
3762 ofd = fd = open(_PATH_TTY, O_RDWR);
3764 /* BTW, bash will try to open(ttyname(0)) if open("/dev/tty") fails.
3765 * That sometimes helps to acquire controlling tty.
3766 * Obviously, a workaround for bugs when someone
3767 * failed to provide a controlling tty to bash! :) */
3773 fd = fcntl(fd, F_DUPFD, 10);
3778 /* fd is a tty at this point */
3779 close_on_exec_on(fd);
3780 while (1) { /* while we are in the background */
3781 pgrp = tcgetpgrp(fd);
3784 ash_msg("can't access tty; job control turned off");
3788 if (pgrp == getpgrp())
3799 xtcsetpgrp(fd, pgrp);
3801 /* turning job control off */
3804 /* was xtcsetpgrp, but this can make exiting ash
3805 * loop forever if pty is already deleted */
3806 tcsetpgrp(fd, pgrp);
3820 static int FAST_FUNC
3821 killcmd(int argc, char **argv)
3823 if (argv[1] && strcmp(argv[1], "-l") != 0) {
3826 if (argv[i][0] == '%') {
3828 * "kill %N" - job kill
3829 * Converting to pgrp / pid kill
3835 jp = getjob(argv[i], 0);
3837 * In jobs started under job control, we signal
3838 * entire process group by kill -PGRP_ID.
3839 * This happens, f.e., in interactive shell.
3841 * Otherwise, we signal each child via
3842 * kill PID1 PID2 PID3.
3844 * sh -c 'sleep 1|sleep 1 & kill %1'
3845 * sh -c 'true|sleep 2 & sleep 1; kill %1'
3846 * sh -c 'true|sleep 1 & sleep 2; kill %1'
3848 n = jp->nprocs; /* can't be 0 (I hope) */
3851 dst = alloca(n * sizeof(int)*4);
3853 for (j = 0; j < n; j++) {
3854 struct procstat *ps = &jp->ps[j];
3855 /* Skip non-running and not-stopped members
3856 * (i.e. dead members) of the job
3858 if (ps->ps_status != -1 && !WIFSTOPPED(ps->ps_status))
3861 * kill_main has matching code to expect
3862 * leading space. Needed to not confuse
3863 * negative pids with "kill -SIGNAL_NO" syntax
3865 dst += sprintf(dst, jp->jobctl ? " -%u" : " %u", (int)ps->ps_pid);
3869 } while (argv[++i]);
3871 return kill_main(argc, argv);
3875 showpipe(struct job *jp /*, FILE *out*/)
3877 struct procstat *ps;
3878 struct procstat *psend;
3880 psend = jp->ps + jp->nprocs;
3881 for (ps = jp->ps + 1; ps < psend; ps++)
3882 printf(" | %s", ps->ps_cmd);
3883 newline_and_flush(stdout);
3884 flush_stdout_stderr();
3889 restartjob(struct job *jp, int mode)
3891 struct procstat *ps;
3897 if (jp->state == JOBDONE)
3899 jp->state = JOBRUNNING;
3900 pgid = jp->ps[0].ps_pid;
3901 if (mode == FORK_FG)
3902 xtcsetpgrp(ttyfd, pgid);
3903 killpg(pgid, SIGCONT);
3907 if (WIFSTOPPED(ps->ps_status)) {
3913 status = (mode == FORK_FG) ? waitforjob(jp) : 0;
3918 static int FAST_FUNC
3919 fg_bgcmd(int argc UNUSED_PARAM, char **argv)
3925 mode = (**argv == 'f') ? FORK_FG : FORK_BG;
3929 jp = getjob(*argv, 1);
3930 if (mode == FORK_BG) {
3931 set_curjob(jp, CUR_RUNNING);
3932 printf("[%d] ", jobno(jp));
3934 out1str(jp->ps[0].ps_cmd);
3935 showpipe(jp /*, stdout*/);
3936 retval = restartjob(jp, mode);
3937 } while (*argv && *++argv);
3943 sprint_status48(char *s, int status, int sigonly)
3949 if (!WIFEXITED(status)) {
3950 if (JOBS && WIFSTOPPED(status))
3951 st = WSTOPSIG(status);
3953 st = WTERMSIG(status);
3955 if (st == SIGINT || st == SIGPIPE)
3957 if (JOBS && WIFSTOPPED(status))
3961 //TODO: use bbox's get_signame? strsignal adds ~600 bytes to text+rodata
3962 col = fmtstr(s, 32, strsignal(st));
3963 if (WCOREDUMP(status)) {
3964 strcpy(s + col, " (core dumped)");
3965 col += sizeof(" (core dumped)")-1;
3967 } else if (!sigonly) {
3968 st = WEXITSTATUS(status);
3969 col = fmtstr(s, 16, (st ? "Done(%d)" : "Done"), st);
3976 dowait(int wait_flags, struct job *job)
3981 struct job *thisjob;
3983 TRACE(("dowait(0x%x) called\n", wait_flags));
3985 /* Do a wait system call. If job control is compiled in, we accept
3986 * stopped processes. wait_flags may have WNOHANG, preventing blocking.
3987 * NB: _not_ safe_waitpid, we need to detect EINTR */
3989 wait_flags |= WUNTRACED;
3990 pid = waitpid(-1, &status, wait_flags);
3991 TRACE(("wait returns pid=%d, status=0x%x, errno=%d(%s)\n",
3992 pid, status, errno, strerror(errno)));
3998 for (jp = curjob; jp; jp = jp->prev_job) {
4000 struct procstat *ps;
4001 struct procstat *psend;
4002 if (jp->state == JOBDONE)
4006 psend = ps + jp->nprocs;
4008 if (ps->ps_pid == pid) {
4009 TRACE(("Job %d: changing status of proc %d "
4010 "from 0x%x to 0x%x\n",
4011 jobno(jp), pid, ps->ps_status, status));
4012 ps->ps_status = status;
4015 if (ps->ps_status == -1)
4016 jobstate = JOBRUNNING;
4018 if (jobstate == JOBRUNNING)
4020 if (WIFSTOPPED(ps->ps_status)) {
4021 jp->stopstatus = ps->ps_status;
4022 jobstate = JOBSTOPPED;
4025 } while (++ps < psend);
4029 /* Found the job where one of its processes changed its state.
4030 * Is there at least one live and running process in this job? */
4031 if (jobstate != JOBRUNNING) {
4032 /* No. All live processes in the job are stopped
4033 * (JOBSTOPPED) or there are no live processes (JOBDONE)
4035 thisjob->changed = 1;
4036 if (thisjob->state != jobstate) {
4037 TRACE(("Job %d: changing state from %d to %d\n",
4038 jobno(thisjob), thisjob->state, jobstate));
4039 thisjob->state = jobstate;
4041 if (jobstate == JOBSTOPPED)
4042 set_curjob(thisjob, CUR_STOPPED);
4048 /* The process wasn't found in job list */
4049 if (JOBS && !WIFSTOPPED(status))
4054 if (thisjob && thisjob == job) {
4058 len = sprint_status48(s, status, 1);
4069 blocking_wait_with_raise_on_sig(void)
4071 pid_t pid = dowait(DOWAIT_BLOCK, NULL);
4072 if (pid <= 0 && pending_sig)
4073 raise_exception(EXSIG);
4079 showjob(struct job *jp, int mode)
4081 struct procstat *ps;
4082 struct procstat *psend;
4085 char s[16 + 16 + 48];
4086 FILE *out = (mode & SHOW_STDERR ? stderr : stdout);
4090 if (mode & SHOW_ONLY_PGID) { /* jobs -p */
4091 /* just output process (group) id of pipeline */
4092 fprintf(out, "%d\n", ps->ps_pid);
4096 col = fmtstr(s, 16, "[%d] ", jobno(jp));
4101 else if (curjob && jp == curjob->prev_job)
4104 if (mode & SHOW_PIDS)
4105 col += fmtstr(s + col, 16, "%d ", ps->ps_pid);
4107 psend = ps + jp->nprocs;
4109 if (jp->state == JOBRUNNING) {
4110 strcpy(s + col, "Running");
4111 col += sizeof("Running") - 1;
4113 int status = psend[-1].ps_status;
4114 if (jp->state == JOBSTOPPED)
4115 status = jp->stopstatus;
4116 col += sprint_status48(s + col, status, 0);
4118 /* By now, "[JOBID]* [maybe PID] STATUS" is printed */
4120 /* This loop either prints "<cmd1> | <cmd2> | <cmd3>" line
4121 * or prints several "PID | <cmdN>" lines,
4122 * depending on SHOW_PIDS bit.
4123 * We do not print status of individual processes
4124 * between PID and <cmdN>. bash does it, but not very well:
4125 * first line shows overall job status, not process status,
4126 * making it impossible to know 1st process status.
4130 /* for each process */
4133 if (mode & SHOW_PIDS)
4134 col = fmtstr(s, 48, "\n%*c%d ", indent_col, ' ', ps->ps_pid) - 1;
4136 fprintf(out, "%s%*c%s%s",
4138 33 - col >= 0 ? 33 - col : 0, ' ',
4139 ps == jp->ps ? "" : "| ",
4142 } while (++ps != psend);
4143 newline_and_flush(out);
4147 if (jp->state == JOBDONE) {
4148 TRACE(("showjob: freeing job %d\n", jobno(jp)));
4154 * Print a list of jobs. If "change" is nonzero, only print jobs whose
4155 * statuses have changed since the last call to showjobs.
4162 TRACE(("showjobs(0x%x) called\n", mode));
4164 /* Handle all finished jobs */
4165 while (dowait(DOWAIT_NONBLOCK, NULL) > 0)
4168 for (jp = curjob; jp; jp = jp->prev_job) {
4169 if (!(mode & SHOW_CHANGED) || jp->changed) {
4175 static int FAST_FUNC
4176 jobscmd(int argc UNUSED_PARAM, char **argv)
4181 while ((m = nextopt("lp")) != '\0') {
4185 mode |= SHOW_ONLY_PGID;
4191 showjob(getjob(*argv, 0), mode);
4201 /* Called only on finished or stopped jobs (no members are running) */
4203 getstatus(struct job *job)
4207 struct procstat *ps;
4209 /* Fetch last member's status */
4210 ps = job->ps + job->nprocs - 1;
4211 status = ps->ps_status;
4213 /* "set -o pipefail" mode: use last _nonzero_ status */
4214 while (status == 0 && --ps >= job->ps)
4215 status = ps->ps_status;
4218 retval = WEXITSTATUS(status);
4219 if (!WIFEXITED(status)) {
4221 retval = WSTOPSIG(status);
4222 if (!WIFSTOPPED(status))
4225 /* XXX: limits number of signals */
4226 retval = WTERMSIG(status);
4228 if (retval == SIGINT)
4234 TRACE(("getstatus: job %d, nproc %d, status 0x%x, retval 0x%x\n",
4235 jobno(job), job->nprocs, status, retval));
4239 static int FAST_FUNC
4240 waitcmd(int argc UNUSED_PARAM, char **argv)
4247 raise_exception(EXSIG);
4254 /* wait for all jobs */
4258 if (!jp) /* no running procs */
4260 if (jp->state == JOBRUNNING)
4265 blocking_wait_with_raise_on_sig();
4267 * "When bash is waiting for an asynchronous command via
4268 * the wait builtin, the reception of a signal for which a trap
4269 * has been set will cause the wait builtin to return immediately
4270 * with an exit status greater than 128, immediately after which
4271 * the trap is executed."
4273 * blocking_wait_with_raise_on_sig raises signal handlers
4274 * if it gets no pid (pid < 0). However,
4275 * if child sends us a signal *and immediately exits*,
4276 * blocking_wait_with_raise_on_sig gets pid > 0
4277 * and does not handle pending_sig. Check this case: */
4279 raise_exception(EXSIG);
4285 if (**argv != '%') {
4286 pid_t pid = number(*argv);
4291 if (job->ps[job->nprocs - 1].ps_pid == pid)
4293 job = job->prev_job;
4296 job = getjob(*argv, 0);
4298 /* loop until process terminated or stopped */
4299 while (job->state == JOBRUNNING)
4300 blocking_wait_with_raise_on_sig();
4302 retval = getstatus(job);
4315 struct job *jp, *jq;
4317 len = njobs * sizeof(*jp);
4319 jp = ckrealloc(jq, len + 4 * sizeof(*jp));
4321 offset = (char *)jp - (char *)jq;
4323 /* Relocate pointers */
4326 jq = (struct job *)((char *)jq + l);
4330 #define joff(p) ((struct job *)((char *)(p) + l))
4331 #define jmove(p) (p) = (void *)((char *)(p) + offset)
4332 if (joff(jp)->ps == &jq->ps0)
4333 jmove(joff(jp)->ps);
4334 if (joff(jp)->prev_job)
4335 jmove(joff(jp)->prev_job);
4345 jp = (struct job *)((char *)jp + len);
4349 } while (--jq >= jp);
4354 * Return a new job structure.
4355 * Called with interrupts off.
4358 makejob(/*union node *node,*/ int nprocs)
4363 for (i = njobs, jp = jobtab; ; jp++) {
4370 if (jp->state != JOBDONE || !jp->waited)
4379 memset(jp, 0, sizeof(*jp));
4381 /* jp->jobctl is a bitfield.
4382 * "jp->jobctl |= jobctl" likely to give awful code */
4386 jp->prev_job = curjob;
4391 jp->ps = ckmalloc(nprocs * sizeof(struct procstat));
4393 TRACE(("makejob(%d) returns %%%d\n", nprocs,
4400 * Return a string identifying a command (to be printed by the
4403 static char *cmdnextc;
4406 cmdputs(const char *s)
4408 static const char vstype[VSTYPE + 1][3] = {
4409 "", "}", "-", "+", "?", "=",
4410 "%", "%%", "#", "##"
4411 IF_ASH_BASH_COMPAT(, ":", "/", "//")
4414 const char *p, *str;
4418 unsigned char subtype = 0;
4422 nextc = makestrspace((strlen(s) + 1) * 8, cmdnextc);
4424 while ((c = *p++) != '\0') {
4432 if ((subtype & VSTYPE) == VSLENGTH)
4438 str = "\"}" + !(quoted & 1);
4445 #if ENABLE_SH_MATH_SUPPORT
4460 if ((subtype & VSTYPE) != VSNORMAL)
4462 str = vstype[subtype & VSTYPE];
4463 if (subtype & VSNUL)
4472 /* These can only happen inside quotes */
4485 while ((c = *str++) != '\0') {
4488 } /* while *p++ not NUL */
4491 USTPUTC('"', nextc);
4497 /* cmdtxt() and cmdlist() call each other */
4498 static void cmdtxt(union node *n);
4501 cmdlist(union node *np, int sep)
4503 for (; np; np = np->narg.next) {
4507 if (sep && np->narg.next)
4513 cmdtxt(union node *n)
4516 struct nodelist *lp;
4527 lp = n->npipe.cmdlist;
4545 cmdtxt(n->nbinary.ch1);
4561 cmdtxt(n->nif.test);
4563 if (n->nif.elsepart) {
4564 cmdtxt(n->nif.ifpart);
4566 n = n->nif.elsepart;
4584 cmdtxt(n->nbinary.ch1);
4594 cmdputs(n->nfor.var);
4596 cmdlist(n->nfor.args, 1);
4601 cmdputs(n->narg.text);
4605 cmdlist(n->ncmd.args, 1);
4606 cmdlist(n->ncmd.redirect, 0);
4619 cmdputs(n->ncase.expr->narg.text);
4621 for (np = n->ncase.cases; np; np = np->nclist.next) {
4622 cmdtxt(np->nclist.pattern);
4624 cmdtxt(np->nclist.body);
4638 #if ENABLE_ASH_BASH_COMPAT
4653 cmdputs(utoa(n->nfile.fd));
4655 if (n->type == NTOFD || n->type == NFROMFD) {
4656 cmdputs(utoa(n->ndup.dupfd));
4665 commandtext(union node *n)
4669 STARTSTACKSTR(cmdnextc);
4671 name = stackblock();
4672 TRACE(("commandtext: name %p, end %p\n\t\"%s\"\n",
4673 name, cmdnextc, cmdnextc));
4674 return ckstrdup(name);
4679 * Fork off a subshell. If we are doing job control, give the subshell its
4680 * own process group. Jp is a job structure that the job is to be added to.
4681 * N is the command that will be evaluated by the child. Both jp and n may
4682 * be NULL. The mode parameter can be one of the following:
4683 * FORK_FG - Fork off a foreground process.
4684 * FORK_BG - Fork off a background process.
4685 * FORK_NOJOB - Like FORK_FG, but don't give the process its own
4686 * process group even if job control is on.
4688 * When job control is turned off, background processes have their standard
4689 * input redirected to /dev/null (except for the second and later processes
4692 * Called with interrupts off.
4695 * Clear traps on a fork.
4702 for (tp = trap; tp < &trap[NSIG]; tp++) {
4703 if (*tp && **tp) { /* trap not NULL or "" (SIG_IGN) */
4705 if (trap_ptr == trap)
4707 /* else: it "belongs" to trap_ptr vector, don't free */
4709 if ((tp - trap) != 0)
4710 setsignal(tp - trap);
4717 /* Lives far away from here, needed for forkchild */
4718 static void closescript(void);
4720 /* Called after fork(), in child */
4721 static NOINLINE void
4722 forkchild(struct job *jp, union node *n, int mode)
4726 TRACE(("Child shell %d\n", getpid()));
4730 /* man bash: "Non-builtin commands run by bash have signal handlers
4731 * set to the values inherited by the shell from its parent".
4732 * Do we do it correctly? */
4736 if (mode == FORK_NOJOB /* is it `xxx` ? */
4737 && n && n->type == NCMD /* is it single cmd? */
4738 /* && n->ncmd.args->type == NARG - always true? */
4739 && n->ncmd.args && strcmp(n->ncmd.args->narg.text, "trap") == 0
4740 && n->ncmd.args->narg.next == NULL /* "trap" with no arguments */
4741 /* && n->ncmd.args->narg.backquote == NULL - do we need to check this? */
4743 TRACE(("Trap hack\n"));
4744 /* Awful hack for `trap` or $(trap).
4746 * http://www.opengroup.org/onlinepubs/009695399/utilities/trap.html
4747 * contains an example where "trap" is executed in a subshell:
4749 * save_traps=$(trap)
4751 * eval "$save_traps"
4753 * Standard does not say that "trap" in subshell shall print
4754 * parent shell's traps. It only says that its output
4755 * must have suitable form, but then, in the above example
4756 * (which is not supposed to be normative), it implies that.
4758 * bash (and probably other shell) does implement it
4759 * (traps are reset to defaults, but "trap" still shows them),
4760 * but as a result, "trap" logic is hopelessly messed up:
4763 * trap -- 'echo Ho' SIGWINCH <--- we have a handler
4764 * # (trap) <--- trap is in subshell - no output (correct, traps are reset)
4765 * # true | trap <--- trap is in subshell - no output (ditto)
4766 * # echo `true | trap` <--- in subshell - output (but traps are reset!)
4767 * trap -- 'echo Ho' SIGWINCH
4768 * # echo `(trap)` <--- in subshell in subshell - output
4769 * trap -- 'echo Ho' SIGWINCH
4770 * # echo `true | (trap)` <--- in subshell in subshell in subshell - output!
4771 * trap -- 'echo Ho' SIGWINCH
4773 * The rules when to forget and when to not forget traps
4774 * get really complex and nonsensical.
4776 * Our solution: ONLY bare $(trap) or `trap` is special.
4778 /* Save trap handler strings for trap builtin to print */
4779 trap_ptr = xmemdup(trap, sizeof(trap));
4780 /* Fall through into clearing traps */
4784 /* do job control only in root shell */
4786 if (mode != FORK_NOJOB && jp->jobctl && oldlvl == 0) {
4789 if (jp->nprocs == 0)
4792 pgrp = jp->ps[0].ps_pid;
4793 /* this can fail because we are doing it in the parent also */
4795 if (mode == FORK_FG)
4796 xtcsetpgrp(ttyfd, pgrp);
4801 if (mode == FORK_BG) {
4802 /* man bash: "When job control is not in effect,
4803 * asynchronous commands ignore SIGINT and SIGQUIT" */
4806 if (jp->nprocs == 0) {
4808 if (open(bb_dev_null, O_RDONLY) != 0)
4809 ash_msg_and_raise_error("can't open '%s'", bb_dev_null);
4813 if (iflag) { /* why if iflag only? */
4818 * "In all cases, bash ignores SIGQUIT. Non-builtin
4819 * commands run by bash have signal handlers
4820 * set to the values inherited by the shell
4822 * Take care of the second rule: */
4826 if (n && n->type == NCMD
4827 && n->ncmd.args && strcmp(n->ncmd.args->narg.text, "jobs") == 0
4829 TRACE(("Job hack\n"));
4830 /* "jobs": we do not want to clear job list for it,
4831 * instead we remove only _its_ own_ job from job list.
4832 * This makes "jobs .... | cat" more useful.
4838 for (jp = curjob; jp; jp = jp->prev_job)
4843 /* Called after fork(), in parent */
4845 #define forkparent(jp, n, mode, pid) forkparent(jp, mode, pid)
4848 forkparent(struct job *jp, union node *n, int mode, pid_t pid)
4850 TRACE(("In parent shell: child = %d\n", pid));
4852 while (jobless && dowait(DOWAIT_NONBLOCK, NULL) > 0)
4858 if (mode != FORK_NOJOB && jp->jobctl) {
4861 if (jp->nprocs == 0)
4864 pgrp = jp->ps[0].ps_pid;
4865 /* This can fail because we are doing it in the child also */
4869 if (mode == FORK_BG) {
4870 backgndpid = pid; /* set $! */
4871 set_curjob(jp, CUR_RUNNING);
4874 struct procstat *ps = &jp->ps[jp->nprocs++];
4877 ps->ps_cmd = nullstr;
4879 if (doing_jobctl && n)
4880 ps->ps_cmd = commandtext(n);
4886 forkshell(struct job *jp, union node *n, int mode)
4890 TRACE(("forkshell(%%%d, %p, %d) called\n", jobno(jp), n, mode));
4893 TRACE(("Fork failed, errno=%d", errno));
4896 ash_msg_and_raise_error("can't fork");
4899 CLEAR_RANDOM_T(&random_gen); /* or else $RANDOM repeats in child */
4900 forkchild(jp, n, mode);
4902 forkparent(jp, n, mode, pid);
4908 * Wait for job to finish.
4910 * Under job control we have the problem that while a child process
4911 * is running interrupts generated by the user are sent to the child
4912 * but not to the shell. This means that an infinite loop started by
4913 * an interactive user may be hard to kill. With job control turned off,
4914 * an interactive user may place an interactive program inside a loop.
4915 * If the interactive program catches interrupts, the user doesn't want
4916 * these interrupts to also abort the loop. The approach we take here
4917 * is to have the shell ignore interrupt signals while waiting for a
4918 * foreground process to terminate, and then send itself an interrupt
4919 * signal if the child process was terminated by an interrupt signal.
4920 * Unfortunately, some programs want to do a bit of cleanup and then
4921 * exit on interrupt; unless these processes terminate themselves by
4922 * sending a signal to themselves (instead of calling exit) they will
4923 * confuse this approach.
4925 * Called with interrupts off.
4928 waitforjob(struct job *jp)
4932 TRACE(("waitforjob(%%%d) called\n", jobno(jp)));
4935 while (jp->state == JOBRUNNING) {
4936 /* In non-interactive shells, we _can_ get
4937 * a keyboard signal here and be EINTRed,
4938 * but we just loop back, waiting for command to complete.
4941 * "If bash is waiting for a command to complete and receives
4942 * a signal for which a trap has been set, the trap
4943 * will not be executed until the command completes."
4945 * Reality is that even if trap is not set, bash
4946 * will not act on the signal until command completes.
4947 * Try this. sleep5intoff.c:
4948 * #include <signal.h>
4949 * #include <unistd.h>
4952 * sigemptyset(&set);
4953 * sigaddset(&set, SIGINT);
4954 * sigaddset(&set, SIGQUIT);
4955 * sigprocmask(SIG_BLOCK, &set, NULL);
4959 * $ bash -c './sleep5intoff; echo hi'
4960 * ^C^C^C^C <--- pressing ^C once a second
4962 * $ bash -c './sleep5intoff; echo hi'
4963 * ^\^\^\^\hi <--- pressing ^\ (SIGQUIT)
4966 dowait(DOWAIT_BLOCK, jp);
4973 xtcsetpgrp(ttyfd, rootpid);
4975 * This is truly gross.
4976 * If we're doing job control, then we did a TIOCSPGRP which
4977 * caused us (the shell) to no longer be in the controlling
4978 * session -- so we wouldn't have seen any ^C/SIGINT. So, we
4979 * intuit from the subprocess exit status whether a SIGINT
4980 * occurred, and if so interrupt ourselves. Yuck. - mycroft
4982 if (jp->sigint) /* TODO: do the same with all signals */
4983 raise(SIGINT); /* ... by raise(jp->sig) instead? */
4985 if (jp->state == JOBDONE)
4992 * return 1 if there are stopped jobs, otherwise 0
5004 if (jp && jp->state == JOBSTOPPED) {
5005 out2str("You have stopped jobs.\n");
5014 /* ============ redir.c
5016 * Code for dealing with input/output redirection.
5021 #define EMPTY -2 /* marks an unused slot in redirtab */
5022 #define CLOSED -3 /* marks a slot of previously-closed fd */
5025 * Open a file in noclobber mode.
5026 * The code was copied from bash.
5029 noclobberopen(const char *fname)
5032 struct stat finfo, finfo2;
5035 * If the file exists and is a regular file, return an error
5038 r = stat(fname, &finfo);
5039 if (r == 0 && S_ISREG(finfo.st_mode)) {
5045 * If the file was not present (r != 0), make sure we open it
5046 * exclusively so that if it is created before we open it, our open
5047 * will fail. Make sure that we do not truncate an existing file.
5048 * Note that we don't turn on O_EXCL unless the stat failed -- if the
5049 * file was not a regular file, we leave O_EXCL off.
5052 return open(fname, O_WRONLY|O_CREAT|O_EXCL, 0666);
5053 fd = open(fname, O_WRONLY|O_CREAT, 0666);
5055 /* If the open failed, return the file descriptor right away. */
5060 * OK, the open succeeded, but the file may have been changed from a
5061 * non-regular file to a regular file between the stat and the open.
5062 * We are assuming that the O_EXCL open handles the case where FILENAME
5063 * did not exist and is symlinked to an existing file between the stat
5068 * If we can open it and fstat the file descriptor, and neither check
5069 * revealed that it was a regular file, and the file has not been
5070 * replaced, return the file descriptor.
5072 if (fstat(fd, &finfo2) == 0
5073 && !S_ISREG(finfo2.st_mode)
5074 && finfo.st_dev == finfo2.st_dev
5075 && finfo.st_ino == finfo2.st_ino
5080 /* The file has been replaced. badness. */
5087 * Handle here documents. Normally we fork off a process to write the
5088 * data to a pipe. If the document is short, we can stuff the data in
5089 * the pipe without forking.
5091 /* openhere needs this forward reference */
5092 static void expandhere(union node *arg, int fd);
5094 openhere(union node *redir)
5100 ash_msg_and_raise_error("pipe call failed");
5101 if (redir->type == NHERE) {
5102 len = strlen(redir->nhere.doc->narg.text);
5103 if (len <= PIPE_BUF) {
5104 full_write(pip[1], redir->nhere.doc->narg.text, len);
5108 if (forkshell((struct job *)NULL, (union node *)NULL, FORK_NOJOB) == 0) {
5111 ignoresig(SIGINT); //signal(SIGINT, SIG_IGN);
5112 ignoresig(SIGQUIT); //signal(SIGQUIT, SIG_IGN);
5113 ignoresig(SIGHUP); //signal(SIGHUP, SIG_IGN);
5114 ignoresig(SIGTSTP); //signal(SIGTSTP, SIG_IGN);
5115 signal(SIGPIPE, SIG_DFL);
5116 if (redir->type == NHERE)
5117 full_write(pip[1], redir->nhere.doc->narg.text, len);
5119 expandhere(redir->nhere.doc, pip[1]);
5120 _exit(EXIT_SUCCESS);
5128 openredirect(union node *redir)
5133 switch (redir->nfile.type) {
5134 /* Can't happen, our single caller does this itself */
5140 return openhere(redir);
5143 /* For N[X]HERE, reading redir->nfile.expfname would touch beyond
5144 * allocated space. Do it only when we know it is safe.
5146 fname = redir->nfile.expfname;
5148 switch (redir->nfile.type) {
5154 f = open(fname, O_RDONLY);
5159 f = open(fname, O_RDWR|O_CREAT, 0666);
5164 #if ENABLE_ASH_BASH_COMPAT
5167 /* Take care of noclobber mode. */
5169 f = noclobberopen(fname);
5176 f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666);
5181 f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666);
5189 ash_msg_and_raise_error("can't create %s: %s", fname, errmsg(errno, "nonexistent directory"));
5191 ash_msg_and_raise_error("can't open %s: %s", fname, errmsg(errno, "no such file"));
5195 * Copy a file descriptor to be >= to. Returns -1
5196 * if the source file descriptor is closed, EMPTY if there are no unused
5197 * file descriptors left.
5199 /* 0x800..00: bit to set in "to" to request dup2 instead of fcntl(F_DUPFD).
5200 * old code was doing close(to) prior to copyfd() to achieve the same */
5202 COPYFD_EXACT = (int)~(INT_MAX),
5203 COPYFD_RESTORE = (int)((unsigned)COPYFD_EXACT >> 1),
5206 copyfd(int from, int to)
5210 if (to & COPYFD_EXACT) {
5211 to &= ~COPYFD_EXACT;
5213 newfd = dup2(from, to);
5215 newfd = fcntl(from, F_DUPFD, to);
5218 if (errno == EMFILE)
5220 /* Happens when source fd is not open: try "echo >&99" */
5221 ash_msg_and_raise_error("%d: %m", from);
5226 /* Struct def and variable are moved down to the first usage site */
5231 struct redirtab *next;
5234 struct two_fd_t two_fd[];
5236 #define redirlist (G_var.redirlist)
5239 need_to_remember(struct redirtab *rp, int fd)
5243 if (!rp) /* remembering was not requested */
5246 for (i = 0; i < rp->pair_count; i++) {
5247 if (rp->two_fd[i].orig == fd) {
5248 /* already remembered */
5255 /* "hidden" fd is a fd used to read scripts, or a copy of such */
5257 is_hidden_fd(struct redirtab *rp, int fd)
5260 struct parsefile *pf;
5264 /* Check open scripts' fds */
5267 /* We skip pf_fd == 0 case because of the following case:
5268 * $ ash # running ash interactively
5270 * and in script.sh: "exec 9>&0".
5271 * Even though top-level pf_fd _is_ 0,
5272 * it's still ok to use it: "read" builtin uses it,
5273 * why should we cripple "exec" builtin?
5275 if (pf->pf_fd > 0 && fd == pf->pf_fd) {
5283 /* Check saved fds of redirects */
5284 fd |= COPYFD_RESTORE;
5285 for (i = 0; i < rp->pair_count; i++) {
5286 if (rp->two_fd[i].copy == fd) {
5294 * Process a list of redirection commands. If the REDIR_PUSH flag is set,
5295 * old file descriptors are stashed away so that the redirection can be
5296 * undone by calling popredir.
5298 /* flags passed to redirect */
5299 #define REDIR_PUSH 01 /* save previous values of file descriptors */
5300 #define REDIR_SAVEFD2 03 /* set preverrout */
5302 redirect(union node *redir, int flags)
5304 struct redirtab *sv;
5309 int copied_fd2 = -1;
5319 if (flags & REDIR_PUSH) {
5320 union node *tmp = redir;
5323 #if ENABLE_ASH_BASH_COMPAT
5324 if (tmp->nfile.type == NTO2)
5327 tmp = tmp->nfile.next;
5329 sv = ckmalloc(sizeof(*sv) + sv_pos * sizeof(sv->two_fd[0]));
5330 sv->next = redirlist;
5331 sv->pair_count = sv_pos;
5333 sv->nullredirs = g_nullredirs - 1;
5335 while (sv_pos > 0) {
5337 sv->two_fd[sv_pos].orig = sv->two_fd[sv_pos].copy = EMPTY;
5343 fd = redir->nfile.fd;
5344 if (redir->nfile.type == NTOFD || redir->nfile.type == NFROMFD) {
5345 right_fd = redir->ndup.dupfd;
5346 //bb_error_msg("doing %d > %d", fd, right_fd);
5347 /* redirect from/to same file descriptor? */
5350 /* "echo >&10" and 10 is a fd opened to a sh script? */
5351 if (is_hidden_fd(sv, right_fd)) {
5352 errno = EBADF; /* as if it is closed */
5353 ash_msg_and_raise_error("%d: %m", right_fd);
5357 newfd = openredirect(redir); /* always >= 0 */
5359 /* Descriptor wasn't open before redirect.
5360 * Mark it for close in the future */
5361 if (need_to_remember(sv, fd)) {
5362 goto remember_to_close;
5367 #if ENABLE_ASH_BASH_COMPAT
5370 if (need_to_remember(sv, fd)) {
5371 /* Copy old descriptor */
5372 /* Careful to not accidentally "save"
5373 * to the same fd as right side fd in N>&M */
5374 int minfd = right_fd < 10 ? 10 : right_fd + 1;
5375 i = fcntl(fd, F_DUPFD, minfd);
5376 /* You'd expect copy to be CLOEXECed. Currently these extra "saved" fds
5377 * are closed in popredir() in the child, preventing them from leaking
5378 * into child. (popredir() also cleans up the mess in case of failures)
5383 /* Strange error (e.g. "too many files" EMFILE?) */
5387 ash_msg_and_raise_error("%d: %m", fd);
5390 /* EBADF: it is not open - good, remember to close it */
5393 } else { /* fd is open, save its copy */
5394 /* "exec fd>&-" should not close fds
5395 * which point to script file(s).
5396 * Force them to be restored afterwards */
5397 if (is_hidden_fd(sv, fd))
5398 i |= COPYFD_RESTORE;
5402 sv->two_fd[sv_pos].orig = fd;
5403 sv->two_fd[sv_pos].copy = i;
5407 /* NTOFD/NFROMFD: copy redir->ndup.dupfd to fd */
5408 if (redir->ndup.dupfd < 0) { /* "fd>&-" */
5409 /* Don't want to trigger debugging */
5413 copyfd(redir->ndup.dupfd, fd | COPYFD_EXACT);
5415 } else if (fd != newfd) { /* move newfd to fd */
5416 copyfd(newfd, fd | COPYFD_EXACT);
5417 #if ENABLE_ASH_BASH_COMPAT
5418 if (!(redir->nfile.type == NTO2 && fd == 2))
5422 #if ENABLE_ASH_BASH_COMPAT
5423 if (redir->nfile.type == NTO2 && fd == 1) {
5424 /* We already redirected it to fd 1, now copy it to 2 */
5430 } while ((redir = redir->nfile.next) != NULL);
5433 if ((flags & REDIR_SAVEFD2) && copied_fd2 >= 0)
5434 preverrout_fd = copied_fd2;
5438 * Undo the effects of the last redirection.
5441 popredir(int drop, int restore)
5443 struct redirtab *rp;
5446 if (--g_nullredirs >= 0 || redirlist == NULL)
5450 for (i = 0; i < rp->pair_count; i++) {
5451 int fd = rp->two_fd[i].orig;
5452 int copy = rp->two_fd[i].copy;
5453 if (copy == CLOSED) {
5458 if (copy != EMPTY) {
5459 if (!drop || (restore && (copy & COPYFD_RESTORE))) {
5460 copy &= ~COPYFD_RESTORE;
5462 copyfd(copy, fd | COPYFD_EXACT);
5464 close(copy & ~COPYFD_RESTORE);
5467 redirlist = rp->next;
5468 g_nullredirs = rp->nullredirs;
5474 * Undo all redirections. Called on error or interrupt.
5478 * Discard all saved file descriptors.
5481 clearredir(int drop)
5487 popredir(drop, /*restore:*/ 0);
5492 redirectsafe(union node *redir, int flags)
5495 volatile int saveint;
5496 struct jmploc *volatile savehandler = exception_handler;
5497 struct jmploc jmploc;
5500 /* "echo 9>/dev/null; echo >&9; echo result: $?" - result should be 1, not 2! */
5501 err = setjmp(jmploc.loc); // huh?? was = setjmp(jmploc.loc) * 2;
5503 exception_handler = &jmploc;
5504 redirect(redir, flags);
5506 exception_handler = savehandler;
5507 if (err && exception_type != EXERROR)
5508 longjmp(exception_handler->loc, 1);
5509 RESTORE_INT(saveint);
5514 /* ============ Routines to expand arguments to commands
5516 * We have to deal with backquotes, shell variables, and file metacharacters.
5519 #if ENABLE_SH_MATH_SUPPORT
5521 ash_arith(const char *s)
5523 arith_state_t math_state;
5526 math_state.lookupvar = lookupvar;
5527 math_state.setvar = setvar0;
5528 //math_state.endofname = endofname;
5531 result = arith(&math_state, s);
5532 if (math_state.errmsg)
5533 ash_msg_and_raise_error(math_state.errmsg);
5543 #define EXP_FULL 0x1 /* perform word splitting & file globbing */
5544 #define EXP_TILDE 0x2 /* do normal tilde expansion */
5545 #define EXP_VARTILDE 0x4 /* expand tildes in an assignment */
5546 #define EXP_REDIR 0x8 /* file glob for a redirection (1 match only) */
5547 /* ^^^^^^^^^^^^^^ this is meant to support constructs such as "cmd >file*.txt"
5548 * POSIX says for this case:
5549 * Pathname expansion shall not be performed on the word by a
5550 * non-interactive shell; an interactive shell may perform it, but shall
5551 * do so only when the expansion would result in one word.
5552 * Currently, our code complies to the above rule by never globbing
5553 * redirection filenames.
5554 * Bash performs globbing, unless it is non-interactive and in POSIX mode.
5555 * (this means that on a typical Linux distro, bash almost always
5556 * performs globbing, and thus diverges from what we do).
5558 #define EXP_CASE 0x10 /* keeps quotes around for CASE pattern */
5559 #define EXP_QPAT 0x20 /* pattern in quoted parameter expansion */
5560 #define EXP_VARTILDE2 0x40 /* expand tildes after colons only */
5561 #define EXP_WORD 0x80 /* expand word in parameter expansion */
5562 #define EXP_QUOTED 0x100 /* expand word in double quotes */
5566 #define RMESCAPE_ALLOC 0x1 /* Allocate a new string */
5567 #define RMESCAPE_GLOB 0x2 /* Add backslashes for glob */
5568 #define RMESCAPE_GROW 0x8 /* Grow strings instead of stalloc */
5569 #define RMESCAPE_HEAP 0x10 /* Malloc strings instead of stalloc */
5570 #define RMESCAPE_SLASH 0x20 /* Stop globbing after slash */
5572 /* Add CTLESC when necessary. */
5573 #define QUOTES_ESC (EXP_FULL | EXP_CASE | EXP_QPAT | EXP_REDIR)
5574 /* Do not skip NUL characters. */
5575 #define QUOTES_KEEPNUL EXP_TILDE
5578 * Structure specifying which parts of the string should be searched
5579 * for IFS characters.
5582 struct ifsregion *next; /* next region in list */
5583 int begoff; /* offset of start of region */
5584 int endoff; /* offset of end of region */
5585 int nulonly; /* search for nul bytes only */
5589 struct strlist *list;
5590 struct strlist **lastp;
5593 /* output of current string */
5594 static char *expdest;
5595 /* list of back quote expressions */
5596 static struct nodelist *argbackq;
5597 /* first struct in list of ifs regions */
5598 static struct ifsregion ifsfirst;
5599 /* last struct in list */
5600 static struct ifsregion *ifslastp;
5601 /* holds expanded arg list */
5602 static struct arglist exparg;
5607 #if !ENABLE_SH_MATH_SUPPORT
5608 /* cvtnum() is used even if math support is off (to prepare $? values and such) */
5609 typedef long arith_t;
5610 # define ARITH_FMT "%ld"
5617 expdest = makestrspace(sizeof(arith_t)*3 + 2, expdest);
5618 len = fmtstr(expdest, sizeof(arith_t)*3 + 2, ARITH_FMT, num);
5619 STADJUST(len, expdest);
5624 esclen(const char *start, const char *p)
5628 while (p > start && (unsigned char)*--p == CTLESC) {
5635 * Remove any CTLESC characters from a string.
5638 rmescapes(char *str, int flag)
5640 static const char qchars[] ALIGN1 = {
5641 IF_ASH_BASH_COMPAT('/',) CTLESC, CTLQUOTEMARK, '\0' };
5645 unsigned protect_against_glob;
5647 IF_ASH_BASH_COMPAT(unsigned slash = flag & RMESCAPE_SLASH;)
5649 p = strpbrk(str, qchars IF_ASH_BASH_COMPAT(+ !slash));
5655 if (flag & RMESCAPE_ALLOC) {
5656 size_t len = p - str;
5657 size_t fulllen = len + strlen(p) + 1;
5659 if (flag & RMESCAPE_GROW) {
5660 int strloc = str - (char *)stackblock();
5661 r = makestrspace(fulllen, expdest);
5662 /* p and str may be invalidated by makestrspace */
5663 str = (char *)stackblock() + strloc;
5665 } else if (flag & RMESCAPE_HEAP) {
5666 r = ckmalloc(fulllen);
5668 r = stalloc(fulllen);
5672 q = (char *)memcpy(q, str, len) + len;
5677 globbing = flag & RMESCAPE_GLOB;
5678 protect_against_glob = globbing;
5680 if ((unsigned char)*p == CTLQUOTEMARK) {
5681 // Note: both inquotes and protect_against_glob only affect whether
5682 inquotes = ~inquotes;
5684 protect_against_glob = globbing;
5687 if ((unsigned char)*p == CTLESC) {
5691 ash_msg_and_raise_error("CTLESC at EOL (shouldn't happen)");
5693 if (protect_against_glob) {
5696 } else if (*p == '\\' && !inquotes) {
5697 /* naked back slash */
5698 protect_against_glob = 0;
5701 #if ENABLE_ASH_BASH_COMPAT
5702 else if (*p == '/' && slash) {
5703 /* stop handling globbing and mark location of slash */
5704 globbing = slash = 0;
5708 protect_against_glob = globbing;
5713 if (flag & RMESCAPE_GROW) {
5715 STADJUST(q - r + 1, expdest);
5719 #define pmatch(a, b) !fnmatch((a), (b), 0)
5722 * Prepare a pattern for a expmeta (internal glob(3)) call.
5724 * Returns an stalloced string.
5727 preglob(const char *pattern, int flag)
5729 return rmescapes((char *)pattern, flag | RMESCAPE_GLOB);
5733 * Put a string on the stack.
5736 memtodest(const char *p, size_t len, int syntax, int quotes)
5743 q = makestrspace((quotes & QUOTES_ESC) ? len * 2 : len, expdest);
5746 unsigned char c = *p++;
5748 int n = SIT(c, syntax);
5749 if ((quotes & QUOTES_ESC)
5751 || (((quotes & EXP_FULL) || syntax != BASESYNTAX)
5757 } else if (!(quotes & QUOTES_KEEPNUL))
5766 strtodest(const char *p, int syntax, int quotes)
5768 size_t len = strlen(p);
5769 memtodest(p, len, syntax, quotes);
5774 * Record the fact that we have to scan this region of the
5775 * string for IFS characters.
5778 recordregion(int start, int end, int nulonly)
5780 struct ifsregion *ifsp;
5782 if (ifslastp == NULL) {
5786 ifsp = ckzalloc(sizeof(*ifsp));
5787 /*ifsp->next = NULL; - ckzalloc did it */
5788 ifslastp->next = ifsp;
5792 ifslastp->begoff = start;
5793 ifslastp->endoff = end;
5794 ifslastp->nulonly = nulonly;
5798 removerecordregions(int endoff)
5800 if (ifslastp == NULL)
5803 if (ifsfirst.endoff > endoff) {
5804 while (ifsfirst.next) {
5805 struct ifsregion *ifsp;
5807 ifsp = ifsfirst.next->next;
5808 free(ifsfirst.next);
5809 ifsfirst.next = ifsp;
5812 if (ifsfirst.begoff > endoff) {
5815 ifslastp = &ifsfirst;
5816 ifsfirst.endoff = endoff;
5821 ifslastp = &ifsfirst;
5822 while (ifslastp->next && ifslastp->next->begoff < endoff)
5823 ifslastp = ifslastp->next;
5824 while (ifslastp->next) {
5825 struct ifsregion *ifsp;
5827 ifsp = ifslastp->next->next;
5828 free(ifslastp->next);
5829 ifslastp->next = ifsp;
5832 if (ifslastp->endoff > endoff)
5833 ifslastp->endoff = endoff;
5837 exptilde(char *startp, char *p, int flags)
5843 int quotes = flags & QUOTES_ESC;
5847 while ((c = *++p) != '\0') {
5854 if (flags & EXP_VARTILDE)
5864 if (*name == '\0') {
5865 home = lookupvar("HOME");
5867 pw = getpwnam(name);
5872 if (!home || !*home)
5875 strtodest(home, SQSYNTAX, quotes);
5883 * Execute a command inside back quotes. If it's a builtin command, we
5884 * want to save its output in a block obtained from malloc. Otherwise
5885 * we fork off a subprocess and get the output of the command via a pipe.
5886 * Should be called with interrupts off.
5888 struct backcmd { /* result of evalbackcmd */
5889 int fd; /* file descriptor to read from */
5890 int nleft; /* number of chars in buffer */
5891 char *buf; /* buffer */
5892 struct job *jp; /* job structure for command */
5895 /* These forward decls are needed to use "eval" code for backticks handling: */
5896 #define EV_EXIT 01 /* exit after evaluating tree */
5897 static int evaltree(union node *, int);
5899 static void FAST_FUNC
5900 evalbackcmd(union node *n, struct backcmd *result)
5911 saveherefd = herefd;
5919 ash_msg_and_raise_error("pipe call failed");
5920 jp = makejob(/*n,*/ 1);
5921 if (forkshell(jp, n, FORK_NOJOB) == 0) {
5926 copyfd(pip[1], 1 | COPYFD_EXACT);
5930 evaltree(n, EV_EXIT); /* actually evaltreenr... */
5934 result->fd = pip[0];
5937 herefd = saveherefd;
5939 TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n",
5940 result->fd, result->buf, result->nleft, result->jp));
5944 * Expand stuff in backwards quotes.
5947 expbackq(union node *cmd, int flag)
5955 int syntax = flag & EXP_QUOTED ? DQSYNTAX : BASESYNTAX;
5956 struct stackmark smark;
5959 startloc = expdest - (char *)stackblock();
5960 pushstackmark(&smark, startloc);
5961 evalbackcmd(cmd, &in);
5962 popstackmark(&smark);
5969 memtodest(p, i, syntax, flag & QUOTES_ESC);
5973 i = nonblock_immune_read(in.fd, buf, sizeof(buf));
5974 TRACE(("expbackq: read returns %d\n", i));
5983 back_exitstatus = waitforjob(in.jp);
5987 /* Eat all trailing newlines */
5989 for (; dest > (char *)stackblock() && dest[-1] == '\n';)
5993 if (!(flag & EXP_QUOTED))
5994 recordregion(startloc, dest - (char *)stackblock(), 0);
5995 TRACE(("evalbackq: size:%d:'%.*s'\n",
5996 (int)((dest - (char *)stackblock()) - startloc),
5997 (int)((dest - (char *)stackblock()) - startloc),
5998 stackblock() + startloc));
6001 #if ENABLE_SH_MATH_SUPPORT
6003 * Expand arithmetic expression. Backup to start of expression,
6004 * evaluate, place result in (backed up) result, adjust string position.
6016 * This routine is slightly over-complicated for
6017 * efficiency. Next we scan backwards looking for the
6018 * start of arithmetic.
6020 start = stackblock();
6027 while ((unsigned char)*p != CTLARI) {
6031 ash_msg_and_raise_error("missing CTLARI (shouldn't happen)");
6036 esc = esclen(start, p);
6046 removerecordregions(begoff);
6050 if (flag & QUOTES_ESC)
6051 rmescapes(p + 1, 0);
6053 len = cvtnum(ash_arith(p + 1));
6055 if (!(flag & EXP_QUOTED))
6056 recordregion(begoff, begoff + len, 0);
6060 /* argstr needs it */
6061 static char *evalvar(char *p, int flags, struct strlist *var_str_list);
6064 * Perform variable and command substitution. If EXP_FULL is set, output CTLESC
6065 * characters to allow for further processing. Otherwise treat
6066 * $@ like $* since no splitting will be performed.
6068 * var_str_list (can be NULL) is a list of "VAR=val" strings which take precedence
6069 * over shell varables. Needed for "A=a B=$A; echo $B" case - we use it
6070 * for correct expansion of "B=$A" word.
6073 argstr(char *p, int flags, struct strlist *var_str_list)
6075 static const char spclchars[] ALIGN1 = {
6083 #if ENABLE_SH_MATH_SUPPORT
6088 const char *reject = spclchars;
6089 int breakall = (flags & (EXP_WORD | EXP_QUOTED)) == EXP_WORD;
6094 if (!(flags & EXP_VARTILDE)) {
6096 } else if (flags & EXP_VARTILDE2) {
6101 if (flags & EXP_TILDE) {
6104 flags &= ~EXP_TILDE;
6108 p = exptilde(p, q, flags);
6111 startloc = expdest - (char *)stackblock();
6115 length += strcspn(p + length, reject);
6119 IF_SH_MATH_SUPPORT(|| c == CTLENDARI)
6121 /* c == '=' || c == ':' || c == CTLENDARI */
6127 expdest = stack_nputstr(p, length, expdest);
6128 newloc = expdest - (char *)stackblock();
6129 if (breakall && !inquotes && newloc > startloc) {
6130 recordregion(startloc, newloc, 0);
6141 if (flags & EXP_VARTILDE2) {
6145 flags |= EXP_VARTILDE2;
6150 * sort of a hack - expand tildes in variable
6151 * assignments (after the first '=' and after ':'s).
6160 case CTLENDVAR: /* ??? */
6163 inquotes ^= EXP_QUOTED;
6164 /* "$@" syntax adherence hack */
6165 if (inquotes && !memcmp(p, dolatstr + 1, DOLATSTRLEN - 1)) {
6166 p = evalvar(p + 1, flags | inquotes, /* var_str_list: */ NULL) + 1;
6170 if (flags & QUOTES_ESC) {
6181 * Quoted parameter expansion pattern: remove quote
6182 * unless inside inner quotes or we have a literal
6185 if (((flags | inquotes) & (EXP_QPAT | EXP_QUOTED)) ==
6186 EXP_QPAT && *p != '\\')
6191 TRACE(("argstr: evalvar('%s')\n", p));
6192 p = evalvar(p, flags | inquotes, var_str_list);
6193 TRACE(("argstr: evalvar:'%s'\n", (char *)stackblock()));
6196 expbackq(argbackq->n, flags | inquotes);
6197 argbackq = argbackq->next;
6199 #if ENABLE_SH_MATH_SUPPORT
6202 expari(flags | inquotes);
6211 scanleft(char *startp, char *rmesc, char *rmescend UNUSED_PARAM,
6212 char *pattern, int quotes, int zero)
6221 const char *s = loc2;
6228 match = pmatch(pattern, s);
6233 if (quotes && (unsigned char)*loc == CTLESC)
6242 scanright(char *startp, char *rmesc, char *rmescend,
6243 char *pattern, int quotes, int match_at_start)
6245 #if !ENABLE_ASH_OPTIMIZE_FOR_SIZE
6246 int try2optimize = match_at_start;
6252 /* If we called by "${v/pattern/repl}" or "${v//pattern/repl}":
6253 * startp="escaped_value_of_v" rmesc="raw_value_of_v"
6254 * rmescend=""(ptr to NUL in rmesc) pattern="pattern" quotes=match_at_start=1
6256 * loc starts at NUL at the end of startp, loc2 starts at the end of rmesc,
6257 * and on each iteration they go back two/one char until they reach the beginning.
6258 * We try to find a match in "raw_value_of_v", "raw_value_of_", "raw_value_of" etc.
6260 /* TODO: document in what other circumstances we are called. */
6262 for (loc = pattern - 1, loc2 = rmescend; loc >= startp; loc2--) {
6265 const char *s = loc2;
6266 if (match_at_start) {
6270 match = pmatch(pattern, s);
6271 //bb_error_msg("pmatch(pattern:'%s',s:'%s'):%d", pattern, s, match);
6275 #if !ENABLE_ASH_OPTIMIZE_FOR_SIZE
6277 /* Maybe we can optimize this:
6278 * if pattern ends with unescaped *, we can avoid checking
6279 * shorter strings: if "foo*" doesnt match "raw_value_of_v",
6280 * it wont match truncated "raw_value_of_" strings too.
6282 unsigned plen = strlen(pattern);
6283 /* Does it end with "*"? */
6284 if (plen != 0 && pattern[--plen] == '*') {
6285 /* "xxxx*" is not escaped */
6286 /* "xxx\*" is escaped */
6287 /* "xx\\*" is not escaped */
6288 /* "x\\\*" is escaped */
6290 while (plen != 0 && pattern[--plen] == '\\')
6293 break; /* ends with unescaped "*" */
6301 esc = esclen(startp, loc);
6312 static void varunset(const char *, const char *, const char *, int) NORETURN;
6314 varunset(const char *end, const char *var, const char *umsg, int varflags)
6320 msg = "parameter not set";
6322 if ((unsigned char)*end == CTLENDVAR) {
6323 if (varflags & VSNUL)
6329 ash_msg_and_raise_error("%.*s: %s%s", (int)(end - var - 1), var, msg, tail);
6333 subevalvar(char *p, char *varname, int strloc, int subtype,
6334 int startloc, int varflags, int flag, struct strlist *var_str_list)
6336 struct nodelist *saveargbackq = argbackq;
6337 int quotes = flag & QUOTES_ESC;
6340 char *rmesc, *rmescend;
6342 IF_ASH_BASH_COMPAT(char *repl = NULL;)
6343 IF_ASH_BASH_COMPAT(int pos, len, orig_len;)
6344 int saveherefd = herefd;
6345 int amount, resetloc;
6346 IF_ASH_BASH_COMPAT(int workloc;)
6348 char *(*scan)(char*, char*, char*, char*, int, int);
6350 //bb_error_msg("subevalvar(p:'%s',varname:'%s',strloc:%d,subtype:%d,startloc:%d,varflags:%x,quotes:%d)",
6351 // p, varname, strloc, subtype, startloc, varflags, quotes);
6354 argstr(p, EXP_TILDE | (subtype != VSASSIGN && subtype != VSQUESTION ?
6355 (flag & (EXP_QUOTED | EXP_QPAT) ? EXP_QPAT : EXP_CASE) : 0),
6357 STPUTC('\0', expdest);
6358 herefd = saveherefd;
6359 argbackq = saveargbackq;
6360 startp = (char *)stackblock() + startloc;
6364 setvar0(varname, startp);
6365 amount = startp - expdest;
6366 STADJUST(amount, expdest);
6370 varunset(p, varname, startp, varflags);
6373 #if ENABLE_ASH_BASH_COMPAT
6375 //TODO: support more general format ${v:EXPR:EXPR},
6376 // where EXPR follows $(()) rules
6377 loc = str = stackblock() + strloc;
6378 /* Read POS in ${var:POS:LEN} */
6379 pos = atoi(loc); /* number(loc) errors out on "1:4" */
6380 len = str - startp - 1;
6382 /* *loc != '\0', guaranteed by parser */
6386 /* Adjust the length by the number of escapes */
6387 for (ptr = startp; ptr < (str - 1); ptr++) {
6388 if ((unsigned char)*ptr == CTLESC) {
6396 if (*loc++ == ':') {
6400 /* Skip POS in ${var:POS:LEN} */
6402 while (*loc && *loc != ':') {
6404 * bash complains on: var=qwe; echo ${var:1a:123}
6406 ash_msg_and_raise_error(msg_illnum, str);
6410 if (*loc++ == ':') {
6415 /* ${VAR:$((-n)):l} starts n chars from the end */
6416 pos = orig_len + pos;
6418 if ((unsigned)pos >= orig_len) {
6419 /* apart from obvious ${VAR:999999:l},
6420 * covers ${VAR:$((-9999999)):l} - result is ""
6426 if (len > (orig_len - pos))
6427 len = orig_len - pos;
6429 for (str = startp; pos; str++, pos--) {
6430 if (quotes && (unsigned char)*str == CTLESC)
6433 for (loc = startp; len; len--) {
6434 if (quotes && (unsigned char)*str == CTLESC)
6439 amount = loc - expdest;
6440 STADJUST(amount, expdest);
6445 resetloc = expdest - (char *)stackblock();
6447 /* We'll comeback here if we grow the stack while handling
6448 * a VSREPLACE or VSREPLACEALL, since our pointers into the
6449 * stack will need rebasing, and we'll need to remove our work
6452 IF_ASH_BASH_COMPAT(restart:)
6454 amount = expdest - ((char *)stackblock() + resetloc);
6455 STADJUST(-amount, expdest);
6456 startp = (char *)stackblock() + startloc;
6459 rmescend = (char *)stackblock() + strloc;
6461 rmesc = rmescapes(startp, RMESCAPE_ALLOC | RMESCAPE_GROW);
6462 if (rmesc != startp) {
6464 startp = (char *)stackblock() + startloc;
6468 str = (char *)stackblock() + strloc;
6470 * Example: v='a\bc'; echo ${v/\\b/_\\_\z_}
6471 * The result is a_\_z_c (not a\_\_z_c)!
6473 * The search pattern and replace string treat backslashes differently!
6474 * RMESCAPE_SLASH causes preglob to work differently on the pattern
6475 * and string. It's only used on the first call.
6477 preglob(str, IF_ASH_BASH_COMPAT(
6478 (subtype == VSREPLACE || subtype == VSREPLACEALL) && !repl ?
6479 RMESCAPE_SLASH :) 0);
6481 #if ENABLE_ASH_BASH_COMPAT
6482 workloc = expdest - (char *)stackblock();
6483 if (subtype == VSREPLACE || subtype == VSREPLACEALL) {
6487 repl = strchr(str, CTLESC);
6493 //bb_error_msg("str:'%s' repl:'%s'", str, repl);
6495 /* If there's no pattern to match, return the expansion unmolested */
6504 loc = scanright(idx, rmesc, rmescend, str, quotes, 1);
6505 //bb_error_msg("scanright('%s'):'%s'", str, loc);
6507 /* No match, advance */
6508 char *restart_detect = stackblock();
6510 STPUTC(*idx, expdest);
6511 if (quotes && (unsigned char)*idx == CTLESC) {
6514 STPUTC(*idx, expdest);
6516 if (stackblock() != restart_detect)
6521 /* continue; - prone to quadratic behavior, smarter code: */
6524 if (str[0] == '*') {
6525 /* Pattern is "*foo". If "*foo" does not match "long_string",
6526 * it would never match "ong_string" etc, no point in trying.
6533 if (subtype == VSREPLACEALL) {
6535 if (quotes && (unsigned char)*idx == CTLESC)
6544 //bb_error_msg("repl:'%s'", repl);
6545 for (loc = (char*)repl; *loc; loc++) {
6546 char *restart_detect = stackblock();
6547 if (quotes && *loc == '\\') {
6548 STPUTC(CTLESC, expdest);
6551 STPUTC(*loc, expdest);
6552 if (stackblock() != restart_detect)
6557 if (subtype == VSREPLACE) {
6558 //bb_error_msg("tail:'%s', quotes:%x", idx, quotes);
6560 char *restart_detect = stackblock();
6561 STPUTC(*idx, expdest);
6562 if (stackblock() != restart_detect)
6571 /* We've put the replaced text into a buffer at workloc, now
6572 * move it to the right place and adjust the stack.
6574 STPUTC('\0', expdest);
6575 startp = (char *)stackblock() + startloc;
6576 memmove(startp, (char *)stackblock() + workloc, len + 1);
6577 //bb_error_msg("startp:'%s'", startp);
6578 amount = expdest - (startp + len);
6579 STADJUST(-amount, expdest);
6582 #endif /* ENABLE_ASH_BASH_COMPAT */
6584 subtype -= VSTRIMRIGHT;
6586 if (subtype < 0 || subtype > 7)
6589 /* zero = (subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX) */
6590 zero = subtype >> 1;
6591 /* VSTRIMLEFT/VSTRIMRIGHTMAX -> scanleft */
6592 scan = (subtype & 1) ^ zero ? scanleft : scanright;
6594 loc = scan(startp, rmesc, rmescend, str, quotes, zero);
6597 memmove(startp, loc, str - loc);
6598 loc = startp + (str - loc) - 1;
6601 amount = loc - expdest;
6602 STADJUST(amount, expdest);
6608 * Add the value of a specialized variable to the stack string.
6609 * name parameter (examples):
6610 * ash -c 'echo $1' name:'1='
6611 * ash -c 'echo $qwe' name:'qwe='
6612 * ash -c 'echo $$' name:'$='
6613 * ash -c 'echo ${$}' name:'$='
6614 * ash -c 'echo ${$##q}' name:'$=q'
6615 * ash -c 'echo ${#$}' name:'$='
6616 * note: examples with bad shell syntax:
6617 * ash -c 'echo ${#$1}' name:'$=1'
6618 * ash -c 'echo ${#1#}' name:'1=#'
6620 static NOINLINE ssize_t
6621 varvalue(char *name, int varflags, int flags, struct strlist *var_str_list, int *quotedp)
6628 int quoted = *quotedp;
6629 int subtype = varflags & VSTYPE;
6630 int discard = subtype == VSPLUS || subtype == VSLENGTH;
6631 int quotes = (discard ? 0 : (flags & QUOTES_ESC)) | QUOTES_KEEPNUL;
6634 sep = (flags & EXP_FULL) << CHAR_BIT;
6635 syntax = quoted ? DQSYNTAX : BASESYNTAX;
6645 num = shellparam.nparam;
6653 goto check_1char_name;
6655 expdest = makestrspace(NOPTS, expdest);
6656 for (i = NOPTS - 1; i >= 0; i--) {
6658 USTPUTC(optletters(i), expdest);
6664 /* handles cases similar to ${#$1} */
6665 if (name[2] != '\0')
6666 raise_error_syntax("bad substitution");
6679 sep |= ifsset() ? ifsval()[0] : ' ';
6686 while ((p = *ap++) != NULL) {
6687 len += strtodest(p, syntax, quotes);
6691 memtodest(&sepc, 1, syntax, quotes);
6706 num = atoi(name); /* number(name) fails on ${N#str} etc */
6707 if (num < 0 || num > shellparam.nparam)
6709 p = num ? shellparam.p[num - 1] : arg0;
6712 /* NB: name has form "VAR=..." */
6714 /* "A=a B=$A" case: var_str_list is a list of "A=a" strings
6715 * which should be considered before we check variables. */
6717 unsigned name_len = (strchrnul(name, '=') - name) + 1;
6721 str = var_str_list->text;
6722 eq = strchr(str, '=');
6723 if (!eq) /* stop at first non-assignment */
6726 if (name_len == (unsigned)(eq - str)
6727 && strncmp(str, name, name_len) == 0
6730 /* goto value; - WRONG! */
6731 /* think "A=1 A=2 B=$A" */
6733 var_str_list = var_str_list->next;
6734 } while (var_str_list);
6738 p = lookupvar(name);
6743 len = strtodest(p, syntax, quotes);
6744 #if ENABLE_UNICODE_SUPPORT
6745 if (subtype == VSLENGTH && len > 0) {
6746 reinit_unicode_for_ash();
6747 if (unicode_status == UNICODE_ON) {
6748 STADJUST(-len, expdest);
6750 len = unicode_strlen(p);
6758 STADJUST(-len, expdest);
6763 * Expand a variable, and return a pointer to the next character in the
6767 evalvar(char *p, int flag, struct strlist *var_str_list)
6778 varflags = (unsigned char) *p++;
6779 subtype = varflags & VSTYPE;
6780 quoted = flag & EXP_QUOTED;
6782 easy = (!quoted || (*var == '@' && shellparam.nparam));
6783 startloc = expdest - (char *)stackblock();
6784 p = strchr(p, '=') + 1; //TODO: use var_end(p)?
6787 varlen = varvalue(var, varflags, flag, var_str_list, "ed);
6788 if (varflags & VSNUL)
6791 if (subtype == VSPLUS) {
6792 varlen = -1 - varlen;
6796 if (subtype == VSMINUS) {
6801 flag | EXP_TILDE | EXP_WORD,
6809 if (subtype == VSASSIGN || subtype == VSQUESTION) {
6813 subevalvar(p, var, 0, subtype, startloc, varflags,
6814 flag & ~QUOTES_ESC, var_str_list);
6817 * Remove any recorded regions beyond
6820 removerecordregions(startloc);
6824 if (varlen < 0 && uflag)
6825 varunset(p, var, 0, 0);
6827 if (subtype == VSLENGTH) {
6828 cvtnum(varlen > 0 ? varlen : 0);
6832 if (subtype == VSNORMAL) {
6836 recordregion(startloc, expdest - (char *)stackblock(), quoted);
6845 case VSTRIMRIGHTMAX:
6846 #if ENABLE_ASH_BASH_COMPAT
6859 * Terminate the string and start recording the pattern
6862 STPUTC('\0', expdest);
6863 patloc = expdest - (char *)stackblock();
6864 if (NULL == subevalvar(p, /* varname: */ NULL, patloc, subtype,
6865 startloc, varflags, flag, var_str_list)) {
6866 int amount = expdest - (
6867 (char *)stackblock() + patloc - 1
6869 STADJUST(-amount, expdest);
6871 /* Remove any recorded regions beyond start of variable */
6872 removerecordregions(startloc);
6877 if (subtype != VSNORMAL) { /* skip to end of alternative */
6880 unsigned char c = *p++;
6883 else if (c == CTLBACKQ) {
6885 argbackq = argbackq->next;
6886 } else if (c == CTLVAR) {
6887 if ((*p++ & VSTYPE) != VSNORMAL)
6889 } else if (c == CTLENDVAR) {
6899 * Break the argument string into pieces based upon IFS and add the
6900 * strings to the argument list. The regions of the string to be
6901 * searched for IFS characters have been stored by recordregion.
6904 ifsbreakup(char *string, struct arglist *arglist)
6906 struct ifsregion *ifsp;
6911 const char *ifs, *realifs;
6916 if (ifslastp != NULL) {
6919 realifs = ifsset() ? ifsval() : defifs;
6922 p = string + ifsp->begoff;
6923 nulonly = ifsp->nulonly;
6924 ifs = nulonly ? nullstr : realifs;
6926 while (p < string + ifsp->endoff) {
6928 if ((unsigned char)*p == CTLESC)
6930 if (!strchr(ifs, *p)) {
6935 ifsspc = (strchr(defifs, *p) != NULL);
6936 /* Ignore IFS whitespace at start */
6937 if (q == start && ifsspc) {
6943 sp = stzalloc(sizeof(*sp));
6945 *arglist->lastp = sp;
6946 arglist->lastp = &sp->next;
6950 if (p >= string + ifsp->endoff) {
6954 if ((unsigned char)*p == CTLESC)
6956 if (strchr(ifs, *p) == NULL) {
6960 if (strchr(defifs, *p) == NULL) {
6975 } while (ifsp != NULL);
6984 sp = stzalloc(sizeof(*sp));
6986 *arglist->lastp = sp;
6987 arglist->lastp = &sp->next;
6993 struct ifsregion *p;
6998 struct ifsregion *ifsp;
7004 ifsfirst.next = NULL;
7009 * Add a file name to the list.
7012 addfname(const char *name)
7016 sp = stzalloc(sizeof(*sp));
7017 sp->text = sstrdup(name);
7019 exparg.lastp = &sp->next;
7022 /* If we want to use glob() from libc... */
7023 #if !ENABLE_ASH_INTERNAL_GLOB
7025 /* Add the result of glob() to the list */
7027 addglob(const glob_t *pglob)
7029 char **p = pglob->gl_pathv;
7036 expandmeta(struct strlist *str /*, int flag*/)
7038 /* TODO - EXP_REDIR */
7048 p = preglob(str->text, RMESCAPE_ALLOC | RMESCAPE_HEAP);
7049 // GLOB_NOMAGIC (GNU): if no *?[ chars in pattern, return it even if no match
7050 // GLOB_NOCHECK: if no match, return unchanged pattern (sans \* escapes?)
7052 // glibc 2.24.90 glob(GLOB_NOMAGIC) does not remove backslashes used for escaping:
7053 // if you pass it "file\?", it returns "file\?", not "file?", if no match.
7054 // Which means you need to unescape the string, right? Not so fast:
7055 // if there _is_ a file named "file\?" (with backslash), it is returned
7056 // as "file\?" too (whichever pattern you used to find it, say, "file*").
7057 // You DONT KNOW by looking at the result whether you need to unescape it.
7059 // Worse, globbing of "file\?" in a directory with two files, "file?" and "file\?",
7060 // returns "file\?" - which is WRONG: "file\?" pattern matches "file?" file.
7061 // Without GLOB_NOMAGIC, this works correctly ("file?" is returned as a match).
7062 // With GLOB_NOMAGIC | GLOB_NOCHECK, this also works correctly.
7063 // i = glob(p, GLOB_NOMAGIC | GLOB_NOCHECK, NULL, &pglob);
7064 // i = glob(p, GLOB_NOMAGIC, NULL, &pglob);
7065 i = glob(p, 0, NULL, &pglob);
7066 //bb_error_msg("glob('%s'):%d '%s'...", p, i, pglob.gl_pathv ? pglob.gl_pathv[0] : "-");
7071 #if 0 // glibc 2.24.90 bug? Patterns like "*/file", when match, don't set GLOB_MAGCHAR
7072 /* GLOB_MAGCHAR is set if *?[ chars were seen (GNU) */
7073 if (!(pglob.gl_flags & GLOB_MAGCHAR))
7085 *exparg.lastp = str;
7086 rmescapes(str->text, 0);
7087 exparg.lastp = &str->next;
7089 default: /* GLOB_NOSPACE */
7092 ash_msg_and_raise_error(bb_msg_memory_exhausted);
7099 /* ENABLE_ASH_INTERNAL_GLOB: Homegrown globbing code. (dash also has both, uses homegrown one.) */
7102 * Do metacharacter (i.e. *, ?, [...]) expansion.
7105 expmeta(char *expdir, char *enddir, char *name)
7121 for (p = name; esc = 0, *p; p += esc + 1) {
7122 if (*p == '*' || *p == '?')
7124 else if (*p == '[') {
7131 if (*q == '/' || *q == '\0')
7141 if (p[esc] == '/') {
7144 start = p + esc + 1;
7148 if (metaflag == 0) { /* we've reached the end of the file name */
7149 if (enddir != expdir)
7157 if (metaflag == 0 || lstat(expdir, &statb) >= 0)
7168 } while (p < start);
7170 if (enddir == expdir) {
7172 } else if (enddir == expdir + 1 && *expdir == '/') {
7181 if (enddir != expdir)
7183 if (*endname == 0) {
7196 while (!pending_int && (dp = readdir(dirp)) != NULL) {
7197 if (dp->d_name[0] == '.' && !matchdot)
7199 if (pmatch(start, dp->d_name)) {
7201 strcpy(enddir, dp->d_name);
7204 for (p = enddir, cp = dp->d_name; (*p++ = *cp++) != '\0';)
7207 expmeta(expdir, p, endname);
7213 endname[-esc - 1] = esc ? '\\' : '/';
7216 static struct strlist *
7217 msort(struct strlist *list, int len)
7219 struct strlist *p, *q = NULL;
7220 struct strlist **lpp;
7228 for (n = half; --n >= 0;) {
7232 q->next = NULL; /* terminate first half of list */
7233 q = msort(list, half); /* sort first half of list */
7234 p = msort(p, len - half); /* sort second half */
7237 #if ENABLE_LOCALE_SUPPORT
7238 if (strcoll(p->text, q->text) < 0)
7240 if (strcmp(p->text, q->text) < 0)
7264 * Sort the results of file name expansion. It calculates the number of
7265 * strings to sort and then calls msort (short for merge sort) to do the
7268 static struct strlist *
7269 expsort(struct strlist *str)
7275 for (sp = str; sp; sp = sp->next)
7277 return msort(str, len);
7281 expandmeta(struct strlist *str /*, int flag*/)
7283 static const char metachars[] ALIGN1 = {
7286 /* TODO - EXP_REDIR */
7290 struct strlist **savelastp;
7296 if (!strpbrk(str->text, metachars))
7298 savelastp = exparg.lastp;
7301 p = preglob(str->text, RMESCAPE_ALLOC | RMESCAPE_HEAP);
7303 int i = strlen(str->text);
7304 //BUGGY estimation of how long expanded name can be
7305 expdir = ckmalloc(i < 2048 ? 2048 : i+1);
7307 expmeta(expdir, expdir, p);
7312 if (exparg.lastp == savelastp) {
7317 *exparg.lastp = str;
7318 rmescapes(str->text, 0);
7319 exparg.lastp = &str->next;
7321 *exparg.lastp = NULL;
7322 *savelastp = sp = expsort(*savelastp);
7323 while (sp->next != NULL)
7325 exparg.lastp = &sp->next;
7330 #endif /* ENABLE_ASH_INTERNAL_GLOB */
7333 * Perform variable substitution and command substitution on an argument,
7334 * placing the resulting list of arguments in arglist. If EXP_FULL is true,
7335 * perform splitting and file name expansion. When arglist is NULL, perform
7336 * here document expansion.
7339 expandarg(union node *arg, struct arglist *arglist, int flag)
7344 argbackq = arg->narg.backquote;
7345 STARTSTACKSTR(expdest);
7346 ifsfirst.next = NULL;
7348 TRACE(("expandarg: argstr('%s',flags:%x)\n", arg->narg.text, flag));
7349 argstr(arg->narg.text, flag,
7350 /* var_str_list: */ arglist ? arglist->list : NULL);
7351 p = _STPUTC('\0', expdest);
7353 if (arglist == NULL) {
7354 return; /* here document expanded */
7356 p = grabstackstr(p);
7357 TRACE(("expandarg: p:'%s'\n", p));
7358 exparg.lastp = &exparg.list;
7362 if (flag & EXP_FULL) {
7363 ifsbreakup(p, &exparg);
7364 *exparg.lastp = NULL;
7365 exparg.lastp = &exparg.list;
7366 expandmeta(exparg.list /*, flag*/);
7368 if (flag & EXP_REDIR) { /*XXX - for now, just remove escapes */
7370 TRACE(("expandarg: rmescapes:'%s'\n", p));
7372 sp = stzalloc(sizeof(*sp));
7375 exparg.lastp = &sp->next;
7379 *exparg.lastp = NULL;
7381 *arglist->lastp = exparg.list;
7382 arglist->lastp = exparg.lastp;
7387 * Expand shell variables and backquotes inside a here document.
7390 expandhere(union node *arg, int fd)
7393 expandarg(arg, (struct arglist *)NULL, EXP_QUOTED);
7394 full_write(fd, stackblock(), expdest - (char *)stackblock());
7398 * Returns true if the pattern matches the string.
7401 patmatch(char *pattern, const char *string)
7403 return pmatch(preglob(pattern, 0), string);
7407 * See if a pattern matches in a case statement.
7410 casematch(union node *pattern, char *val)
7412 struct stackmark smark;
7415 setstackmark(&smark);
7416 argbackq = pattern->narg.backquote;
7417 STARTSTACKSTR(expdest);
7419 argstr(pattern->narg.text, EXP_TILDE | EXP_CASE,
7420 /* var_str_list: */ NULL);
7421 STACKSTRNUL(expdest);
7422 result = patmatch(stackblock(), val);
7423 popstackmark(&smark);
7428 /* ============ find_command */
7432 int (*builtin)(int, char **) FAST_FUNC;
7433 /* unsigned flags; */
7435 #define IS_BUILTIN_SPECIAL(b) ((b)->name[0] & 1)
7436 /* "regular" builtins always take precedence over commands,
7437 * regardless of PATH=....%builtin... position */
7438 #define IS_BUILTIN_REGULAR(b) ((b)->name[0] & 2)
7439 #define IS_BUILTIN_ASSIGN(b) ((b)->name[0] & 4)
7442 smallint cmdtype; /* CMDxxx */
7445 /* index >= 0 for commands without path (slashes) */
7446 /* (TODO: what exactly does the value mean? PATH position?) */
7447 /* index == -1 for commands with slashes */
7448 /* index == (-2 - applet_no) for NOFORK applets */
7449 const struct builtincmd *cmd;
7450 struct funcnode *func;
7453 /* values of cmdtype */
7454 #define CMDUNKNOWN -1 /* no entry in table for command */
7455 #define CMDNORMAL 0 /* command is an executable program */
7456 #define CMDFUNCTION 1 /* command is a shell function */
7457 #define CMDBUILTIN 2 /* command is a shell builtin */
7459 /* action to find_command() */
7460 #define DO_ERR 0x01 /* prints errors */
7461 #define DO_ABS 0x02 /* checks absolute paths */
7462 #define DO_NOFUNC 0x04 /* don't return shell functions, for command */
7463 #define DO_ALTPATH 0x08 /* using alternate path */
7464 #define DO_ALTBLTIN 0x20 /* %builtin in alt. path */
7466 static void find_command(char *, struct cmdentry *, int, const char *);
7469 /* ============ Hashing commands */
7472 * When commands are first encountered, they are entered in a hash table.
7473 * This ensures that a full path search will not have to be done for them
7474 * on each invocation.
7476 * We should investigate converting to a linear search, even though that
7477 * would make the command name "hash" a misnomer.
7481 struct tblentry *next; /* next entry in hash chain */
7482 union param param; /* definition of builtin function */
7483 smallint cmdtype; /* CMDxxx */
7484 char rehash; /* if set, cd done since entry created */
7485 char cmdname[1]; /* name of command */
7488 static struct tblentry **cmdtable;
7489 #define INIT_G_cmdtable() do { \
7490 cmdtable = xzalloc(CMDTABLESIZE * sizeof(cmdtable[0])); \
7493 static int builtinloc = -1; /* index in path of %builtin, or -1 */
7497 tryexec(IF_FEATURE_SH_STANDALONE(int applet_no,) char *cmd, char **argv, char **envp)
7499 #if ENABLE_FEATURE_SH_STANDALONE
7500 if (applet_no >= 0) {
7501 if (APPLET_IS_NOEXEC(applet_no)) {
7505 run_applet_no_and_exit(applet_no, argv);
7507 /* re-exec ourselves with the new arguments */
7508 execve(bb_busybox_exec_path, argv, envp);
7509 /* If they called chroot or otherwise made the binary no longer
7510 * executable, fall through */
7517 execve(cmd, argv, envp);
7518 } while (errno == EINTR);
7520 execve(cmd, argv, envp);
7522 if (cmd == (char*) bb_busybox_exec_path) {
7523 /* We already visited ENOEXEC branch below, don't do it again */
7524 //TODO: try execve(initial_argv0_of_shell, argv, envp) before giving up?
7528 if (errno == ENOEXEC) {
7529 /* Run "cmd" as a shell script:
7530 * http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html
7531 * "If the execve() function fails with ENOEXEC, the shell
7532 * shall execute a command equivalent to having a shell invoked
7533 * with the command name as its first operand,
7534 * with any remaining arguments passed to the new shell"
7536 * That is, do not use $SHELL, user's shell, or /bin/sh;
7537 * just call ourselves.
7539 * Note that bash reads ~80 chars of the file, and if it sees
7540 * a zero byte before it sees newline, it doesn't try to
7541 * interpret it, but fails with "cannot execute binary file"
7542 * message and exit code 126. For one, this prevents attempts
7543 * to interpret foreign ELF binaries as shell scripts.
7548 for (ap = argv; *ap; ap++)
7550 new = ckmalloc((ap - argv + 2) * sizeof(new[0]));
7551 new[0] = (char*) "ash";
7554 while ((*ap++ = *++argv) != NULL)
7556 cmd = (char*) bb_busybox_exec_path;
7563 * Exec a program. Never returns. If you change this routine, you may
7564 * have to change the find_command routine as well.
7566 static void shellexec(char **, const char *, int) NORETURN;
7568 shellexec(char **argv, const char *path, int idx)
7574 int applet_no = -1; /* used only by FEATURE_SH_STANDALONE */
7576 clearredir(/*drop:*/ 1);
7577 envp = listvars(VEXPORT, VUNSET, /*end:*/ NULL);
7578 if (strchr(argv[0], '/') != NULL
7579 #if ENABLE_FEATURE_SH_STANDALONE
7580 || (applet_no = find_applet_by_name(argv[0])) >= 0
7583 tryexec(IF_FEATURE_SH_STANDALONE(applet_no,) argv[0], argv, envp);
7584 if (applet_no >= 0) {
7585 /* We tried execing ourself, but it didn't work.
7586 * Maybe /proc/self/exe doesn't exist?
7595 while ((cmdname = path_advance(&path, argv[0])) != NULL) {
7596 if (--idx < 0 && pathopt == NULL) {
7597 tryexec(IF_FEATURE_SH_STANDALONE(-1,) cmdname, argv, envp);
7598 if (errno != ENOENT && errno != ENOTDIR)
7605 /* Map to POSIX errors */
7617 exitstatus = exerrno;
7618 TRACE(("shellexec failed for %s, errno %d, suppress_int %d\n",
7619 argv[0], e, suppress_int));
7620 ash_msg_and_raise(EXEXIT, "%s: %s", argv[0], errmsg(e, "not found"));
7625 printentry(struct tblentry *cmdp)
7631 idx = cmdp->param.index;
7634 name = path_advance(&path, cmdp->cmdname);
7636 } while (--idx >= 0);
7637 out1fmt("%s%s\n", name, (cmdp->rehash ? "*" : nullstr));
7641 * Clear out command entries. The argument specifies the first entry in
7642 * PATH which has changed.
7645 clearcmdentry(int firstchange)
7647 struct tblentry **tblp;
7648 struct tblentry **pp;
7649 struct tblentry *cmdp;
7652 for (tblp = cmdtable; tblp < &cmdtable[CMDTABLESIZE]; tblp++) {
7654 while ((cmdp = *pp) != NULL) {
7655 if ((cmdp->cmdtype == CMDNORMAL &&
7656 cmdp->param.index >= firstchange)
7657 || (cmdp->cmdtype == CMDBUILTIN &&
7658 builtinloc >= firstchange)
7671 * Locate a command in the command hash table. If "add" is nonzero,
7672 * add the command to the table if it is not already present. The
7673 * variable "lastcmdentry" is set to point to the address of the link
7674 * pointing to the entry, so that delete_cmd_entry can delete the
7677 * Interrupts must be off if called with add != 0.
7679 static struct tblentry **lastcmdentry;
7681 static struct tblentry *
7682 cmdlookup(const char *name, int add)
7684 unsigned int hashval;
7686 struct tblentry *cmdp;
7687 struct tblentry **pp;
7690 hashval = (unsigned char)*p << 4;
7692 hashval += (unsigned char)*p++;
7694 pp = &cmdtable[hashval % CMDTABLESIZE];
7695 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7696 if (strcmp(cmdp->cmdname, name) == 0)
7700 if (add && cmdp == NULL) {
7701 cmdp = *pp = ckzalloc(sizeof(struct tblentry)
7703 /* + 1 - already done because
7704 * tblentry::cmdname is char[1] */);
7705 /*cmdp->next = NULL; - ckzalloc did it */
7706 cmdp->cmdtype = CMDUNKNOWN;
7707 strcpy(cmdp->cmdname, name);
7714 * Delete the command entry returned on the last lookup.
7717 delete_cmd_entry(void)
7719 struct tblentry *cmdp;
7722 cmdp = *lastcmdentry;
7723 *lastcmdentry = cmdp->next;
7724 if (cmdp->cmdtype == CMDFUNCTION)
7725 freefunc(cmdp->param.func);
7731 * Add a new command entry, replacing any existing command entry for
7732 * the same name - except special builtins.
7735 addcmdentry(char *name, struct cmdentry *entry)
7737 struct tblentry *cmdp;
7739 cmdp = cmdlookup(name, 1);
7740 if (cmdp->cmdtype == CMDFUNCTION) {
7741 freefunc(cmdp->param.func);
7743 cmdp->cmdtype = entry->cmdtype;
7744 cmdp->param = entry->u;
7748 static int FAST_FUNC
7749 hashcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
7751 struct tblentry **pp;
7752 struct tblentry *cmdp;
7754 struct cmdentry entry;
7757 if (nextopt("r") != '\0') {
7762 if (*argptr == NULL) {
7763 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
7764 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7765 if (cmdp->cmdtype == CMDNORMAL)
7773 while ((name = *argptr) != NULL) {
7774 cmdp = cmdlookup(name, 0);
7776 && (cmdp->cmdtype == CMDNORMAL
7777 || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))
7781 find_command(name, &entry, DO_ERR, pathval());
7782 if (entry.cmdtype == CMDUNKNOWN)
7790 * Called when a cd is done. Marks all commands so the next time they
7791 * are executed they will be rehashed.
7796 struct tblentry **pp;
7797 struct tblentry *cmdp;
7799 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
7800 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7801 if (cmdp->cmdtype == CMDNORMAL
7802 || (cmdp->cmdtype == CMDBUILTIN
7803 && !IS_BUILTIN_REGULAR(cmdp->param.cmd)
7813 * Fix command hash table when PATH changed.
7814 * Called before PATH is changed. The argument is the new value of PATH;
7815 * pathval() still returns the old value at this point.
7816 * Called with interrupts off.
7818 static void FAST_FUNC
7819 changepath(const char *new)
7827 firstchange = 9999; /* assume no change */
7833 if ((*old == '\0' && *new == ':')
7834 || (*old == ':' && *new == '\0')
7838 old = new; /* ignore subsequent differences */
7842 if (*new == '%' && idx_bltin < 0 && prefix(new + 1, "builtin"))
7849 if (builtinloc < 0 && idx_bltin >= 0)
7850 builtinloc = idx_bltin; /* zap builtins */
7851 if (builtinloc >= 0 && idx_bltin < 0)
7853 clearcmdentry(firstchange);
7854 builtinloc = idx_bltin;
7879 #if ENABLE_ASH_BASH_COMPAT
7890 typedef smallint token_id_t;
7892 /* Nth bit indicates if token marks the end of a list */
7895 /* 0 */ | (1u << TEOF)
7896 /* 1 */ | (0u << TNL)
7897 /* 2 */ | (0u << TREDIR)
7898 /* 3 */ | (0u << TWORD)
7899 /* 4 */ | (0u << TSEMI)
7900 /* 5 */ | (0u << TBACKGND)
7901 /* 6 */ | (0u << TAND)
7902 /* 7 */ | (0u << TOR)
7903 /* 8 */ | (0u << TPIPE)
7904 /* 9 */ | (0u << TLP)
7905 /* 10 */ | (1u << TRP)
7906 /* 11 */ | (1u << TENDCASE)
7907 /* 12 */ | (1u << TENDBQUOTE)
7908 /* 13 */ | (0u << TNOT)
7909 /* 14 */ | (0u << TCASE)
7910 /* 15 */ | (1u << TDO)
7911 /* 16 */ | (1u << TDONE)
7912 /* 17 */ | (1u << TELIF)
7913 /* 18 */ | (1u << TELSE)
7914 /* 19 */ | (1u << TESAC)
7915 /* 20 */ | (1u << TFI)
7916 /* 21 */ | (0u << TFOR)
7917 #if ENABLE_ASH_BASH_COMPAT
7918 /* 22 */ | (0u << TFUNCTION)
7920 /* 23 */ | (0u << TIF)
7921 /* 24 */ | (0u << TIN)
7922 /* 25 */ | (1u << TTHEN)
7923 /* 26 */ | (0u << TUNTIL)
7924 /* 27 */ | (0u << TWHILE)
7925 /* 28 */ | (0u << TBEGIN)
7926 /* 29 */ | (1u << TEND)
7927 , /* thus far 29 bits used */
7930 static const char *const tokname_array[] = {
7944 #define KWDOFFSET 13
7945 /* the following are keywords */
7955 #if ENABLE_ASH_BASH_COMPAT
7967 /* Wrapper around strcmp for qsort/bsearch/... */
7969 pstrcmp(const void *a, const void *b)
7971 return strcmp((char*)a, *(char**)b);
7974 static const char *const *
7975 findkwd(const char *s)
7977 return bsearch(s, tokname_array + KWDOFFSET,
7978 ARRAY_SIZE(tokname_array) - KWDOFFSET,
7979 sizeof(tokname_array[0]), pstrcmp);
7983 * Locate and print what a word is...
7986 describe_command(char *command, const char *path, int describe_command_verbose)
7988 struct cmdentry entry;
7989 struct tblentry *cmdp;
7990 #if ENABLE_ASH_ALIAS
7991 const struct alias *ap;
7994 path = path ? path : pathval();
7996 if (describe_command_verbose) {
8000 /* First look at the keywords */
8001 if (findkwd(command)) {
8002 out1str(describe_command_verbose ? " is a shell keyword" : command);
8006 #if ENABLE_ASH_ALIAS
8007 /* Then look at the aliases */
8008 ap = lookupalias(command, 0);
8010 if (!describe_command_verbose) {
8015 out1fmt(" is an alias for %s", ap->val);
8019 /* Then check if it is a tracked alias */
8020 cmdp = cmdlookup(command, 0);
8022 entry.cmdtype = cmdp->cmdtype;
8023 entry.u = cmdp->param;
8025 /* Finally use brute force */
8026 find_command(command, &entry, DO_ABS, path);
8029 switch (entry.cmdtype) {
8031 int j = entry.u.index;
8037 p = path_advance(&path, command);
8041 if (describe_command_verbose) {
8043 (cmdp ? " a tracked alias for" : nullstr), p
8052 if (describe_command_verbose) {
8053 out1str(" is a shell function");
8060 if (describe_command_verbose) {
8061 out1fmt(" is a %sshell builtin",
8062 IS_BUILTIN_SPECIAL(entry.u.cmd) ?
8063 "special " : nullstr
8071 if (describe_command_verbose) {
8072 out1str(": not found\n");
8081 static int FAST_FUNC
8082 typecmd(int argc UNUSED_PARAM, char **argv)
8088 /* type -p ... ? (we don't bother checking for 'p') */
8089 if (argv[1] && argv[1][0] == '-') {
8094 err |= describe_command(argv[i++], NULL, verbose);
8099 #if ENABLE_ASH_CMDCMD
8100 /* Is it "command [-p] PROG ARGS" bltin, no other opts? Return ptr to "PROG" if yes */
8102 parse_command_args(char **argv, const char **path)
8115 if (c == '-' && !*cp) {
8123 *path = bb_default_path;
8126 /* run 'typecmd' for other options */
8135 static int FAST_FUNC
8136 commandcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
8144 const char *path = NULL;
8146 /* "command [-p] PROG ARGS" (that is, without -V or -v)
8147 * never reaches this function.
8150 while ((c = nextopt("pvV")) != '\0')
8152 verify |= VERIFY_VERBOSE;
8154 /*verify |= VERIFY_BRIEF*/;
8160 path = bb_default_path;
8162 /* Mimic bash: just "command -v" doesn't complain, it's a nop */
8164 if (/*verify && */ cmd)
8165 return describe_command(cmd, path, verify /* - VERIFY_BRIEF*/);
8172 /*static int funcblocksize; // size of structures in function */
8173 /*static int funcstringsize; // size of strings in node */
8174 static void *funcblock; /* block to allocate function from */
8175 static char *funcstring_end; /* end of block to allocate strings from */
8177 /* flags in argument to evaltree */
8178 #define EV_EXIT 01 /* exit after evaluating tree */
8179 #define EV_TESTED 02 /* exit status is checked; ignore -e flag */
8181 static const uint8_t nodesize[N_NUMBER] ALIGN1 = {
8182 [NCMD ] = SHELL_ALIGN(sizeof(struct ncmd)),
8183 [NPIPE ] = SHELL_ALIGN(sizeof(struct npipe)),
8184 [NREDIR ] = SHELL_ALIGN(sizeof(struct nredir)),
8185 [NBACKGND ] = SHELL_ALIGN(sizeof(struct nredir)),
8186 [NSUBSHELL] = SHELL_ALIGN(sizeof(struct nredir)),
8187 [NAND ] = SHELL_ALIGN(sizeof(struct nbinary)),
8188 [NOR ] = SHELL_ALIGN(sizeof(struct nbinary)),
8189 [NSEMI ] = SHELL_ALIGN(sizeof(struct nbinary)),
8190 [NIF ] = SHELL_ALIGN(sizeof(struct nif)),
8191 [NWHILE ] = SHELL_ALIGN(sizeof(struct nbinary)),
8192 [NUNTIL ] = SHELL_ALIGN(sizeof(struct nbinary)),
8193 [NFOR ] = SHELL_ALIGN(sizeof(struct nfor)),
8194 [NCASE ] = SHELL_ALIGN(sizeof(struct ncase)),
8195 [NCLIST ] = SHELL_ALIGN(sizeof(struct nclist)),
8196 [NDEFUN ] = SHELL_ALIGN(sizeof(struct narg)),
8197 [NARG ] = SHELL_ALIGN(sizeof(struct narg)),
8198 [NTO ] = SHELL_ALIGN(sizeof(struct nfile)),
8199 #if ENABLE_ASH_BASH_COMPAT
8200 [NTO2 ] = SHELL_ALIGN(sizeof(struct nfile)),
8202 [NCLOBBER ] = SHELL_ALIGN(sizeof(struct nfile)),
8203 [NFROM ] = SHELL_ALIGN(sizeof(struct nfile)),
8204 [NFROMTO ] = SHELL_ALIGN(sizeof(struct nfile)),
8205 [NAPPEND ] = SHELL_ALIGN(sizeof(struct nfile)),
8206 [NTOFD ] = SHELL_ALIGN(sizeof(struct ndup)),
8207 [NFROMFD ] = SHELL_ALIGN(sizeof(struct ndup)),
8208 [NHERE ] = SHELL_ALIGN(sizeof(struct nhere)),
8209 [NXHERE ] = SHELL_ALIGN(sizeof(struct nhere)),
8210 [NNOT ] = SHELL_ALIGN(sizeof(struct nnot)),
8213 static int calcsize(int funcblocksize, union node *n);
8216 sizenodelist(int funcblocksize, struct nodelist *lp)
8219 funcblocksize += SHELL_ALIGN(sizeof(struct nodelist));
8220 funcblocksize = calcsize(funcblocksize, lp->n);
8223 return funcblocksize;
8227 calcsize(int funcblocksize, union node *n)
8230 return funcblocksize;
8231 funcblocksize += nodesize[n->type];
8234 funcblocksize = calcsize(funcblocksize, n->ncmd.redirect);
8235 funcblocksize = calcsize(funcblocksize, n->ncmd.args);
8236 funcblocksize = calcsize(funcblocksize, n->ncmd.assign);
8239 funcblocksize = sizenodelist(funcblocksize, n->npipe.cmdlist);
8244 funcblocksize = calcsize(funcblocksize, n->nredir.redirect);
8245 funcblocksize = calcsize(funcblocksize, n->nredir.n);
8252 funcblocksize = calcsize(funcblocksize, n->nbinary.ch2);
8253 funcblocksize = calcsize(funcblocksize, n->nbinary.ch1);
8256 funcblocksize = calcsize(funcblocksize, n->nif.elsepart);
8257 funcblocksize = calcsize(funcblocksize, n->nif.ifpart);
8258 funcblocksize = calcsize(funcblocksize, n->nif.test);
8261 funcblocksize += SHELL_ALIGN(strlen(n->nfor.var) + 1); /* was funcstringsize += ... */
8262 funcblocksize = calcsize(funcblocksize, n->nfor.body);
8263 funcblocksize = calcsize(funcblocksize, n->nfor.args);
8266 funcblocksize = calcsize(funcblocksize, n->ncase.cases);
8267 funcblocksize = calcsize(funcblocksize, n->ncase.expr);
8270 funcblocksize = calcsize(funcblocksize, n->nclist.body);
8271 funcblocksize = calcsize(funcblocksize, n->nclist.pattern);
8272 funcblocksize = calcsize(funcblocksize, n->nclist.next);
8276 funcblocksize = sizenodelist(funcblocksize, n->narg.backquote);
8277 funcblocksize += SHELL_ALIGN(strlen(n->narg.text) + 1); /* was funcstringsize += ... */
8278 funcblocksize = calcsize(funcblocksize, n->narg.next);
8281 #if ENABLE_ASH_BASH_COMPAT
8288 funcblocksize = calcsize(funcblocksize, n->nfile.fname);
8289 funcblocksize = calcsize(funcblocksize, n->nfile.next);
8293 funcblocksize = calcsize(funcblocksize, n->ndup.vname);
8294 funcblocksize = calcsize(funcblocksize, n->ndup.next);
8298 funcblocksize = calcsize(funcblocksize, n->nhere.doc);
8299 funcblocksize = calcsize(funcblocksize, n->nhere.next);
8302 funcblocksize = calcsize(funcblocksize, n->nnot.com);
8305 return funcblocksize;
8309 nodeckstrdup(char *s)
8311 funcstring_end -= SHELL_ALIGN(strlen(s) + 1);
8312 return strcpy(funcstring_end, s);
8315 static union node *copynode(union node *);
8317 static struct nodelist *
8318 copynodelist(struct nodelist *lp)
8320 struct nodelist *start;
8321 struct nodelist **lpp;
8326 funcblock = (char *) funcblock + SHELL_ALIGN(sizeof(struct nodelist));
8327 (*lpp)->n = copynode(lp->n);
8329 lpp = &(*lpp)->next;
8336 copynode(union node *n)
8343 funcblock = (char *) funcblock + nodesize[n->type];
8347 new->ncmd.redirect = copynode(n->ncmd.redirect);
8348 new->ncmd.args = copynode(n->ncmd.args);
8349 new->ncmd.assign = copynode(n->ncmd.assign);
8352 new->npipe.cmdlist = copynodelist(n->npipe.cmdlist);
8353 new->npipe.pipe_backgnd = n->npipe.pipe_backgnd;
8358 new->nredir.redirect = copynode(n->nredir.redirect);
8359 new->nredir.n = copynode(n->nredir.n);
8366 new->nbinary.ch2 = copynode(n->nbinary.ch2);
8367 new->nbinary.ch1 = copynode(n->nbinary.ch1);
8370 new->nif.elsepart = copynode(n->nif.elsepart);
8371 new->nif.ifpart = copynode(n->nif.ifpart);
8372 new->nif.test = copynode(n->nif.test);
8375 new->nfor.var = nodeckstrdup(n->nfor.var);
8376 new->nfor.body = copynode(n->nfor.body);
8377 new->nfor.args = copynode(n->nfor.args);
8380 new->ncase.cases = copynode(n->ncase.cases);
8381 new->ncase.expr = copynode(n->ncase.expr);
8384 new->nclist.body = copynode(n->nclist.body);
8385 new->nclist.pattern = copynode(n->nclist.pattern);
8386 new->nclist.next = copynode(n->nclist.next);
8390 new->narg.backquote = copynodelist(n->narg.backquote);
8391 new->narg.text = nodeckstrdup(n->narg.text);
8392 new->narg.next = copynode(n->narg.next);
8395 #if ENABLE_ASH_BASH_COMPAT
8402 new->nfile.fname = copynode(n->nfile.fname);
8403 new->nfile.fd = n->nfile.fd;
8404 new->nfile.next = copynode(n->nfile.next);
8408 new->ndup.vname = copynode(n->ndup.vname);
8409 new->ndup.dupfd = n->ndup.dupfd;
8410 new->ndup.fd = n->ndup.fd;
8411 new->ndup.next = copynode(n->ndup.next);
8415 new->nhere.doc = copynode(n->nhere.doc);
8416 new->nhere.fd = n->nhere.fd;
8417 new->nhere.next = copynode(n->nhere.next);
8420 new->nnot.com = copynode(n->nnot.com);
8423 new->type = n->type;
8428 * Make a copy of a parse tree.
8430 static struct funcnode *
8431 copyfunc(union node *n)
8436 /*funcstringsize = 0;*/
8437 blocksize = offsetof(struct funcnode, n) + calcsize(0, n);
8438 f = ckzalloc(blocksize /* + funcstringsize */);
8439 funcblock = (char *) f + offsetof(struct funcnode, n);
8440 funcstring_end = (char *) f + blocksize;
8442 /* f->count = 0; - ckzalloc did it */
8447 * Define a shell function.
8450 defun(char *name, union node *func)
8452 struct cmdentry entry;
8455 entry.cmdtype = CMDFUNCTION;
8456 entry.u.func = copyfunc(func);
8457 addcmdentry(name, &entry);
8461 /* Reasons for skipping commands (see comment on breakcmd routine) */
8462 #define SKIPBREAK (1 << 0)
8463 #define SKIPCONT (1 << 1)
8464 #define SKIPFUNC (1 << 2)
8465 static smallint evalskip; /* set to SKIPxxx if we are skipping commands */
8466 static int skipcount; /* number of levels to skip */
8467 static int funcnest; /* depth of function calls */
8468 static int loopnest; /* current loop nesting level */
8470 /* Forward decl way out to parsing code - dotrap needs it */
8471 static int evalstring(char *s, int flags);
8473 /* Called to execute a trap.
8474 * Single callsite - at the end of evaltree().
8475 * If we return non-zero, evaltree raises EXEXIT exception.
8477 * Perhaps we should avoid entering new trap handlers
8478 * while we are executing a trap handler. [is it a TODO?]
8485 uint8_t last_status;
8490 last_status = exitstatus;
8494 TRACE(("dotrap entered\n"));
8495 for (sig = 1, g = gotsig; sig < NSIG; sig++, g++) {
8507 /* non-trapped SIGINT is handled separately by raise_interrupt,
8508 * don't upset it by resetting gotsig[SIGINT-1] */
8509 if (sig == SIGINT && !p)
8512 TRACE(("sig %d is active, will run handler '%s'\n", sig, p));
8518 exitstatus = last_status;
8519 TRACE(("dotrap returns\n"));
8522 /* forward declarations - evaluation is fairly recursive business... */
8523 static int evalloop(union node *, int);
8524 static int evalfor(union node *, int);
8525 static int evalcase(union node *, int);
8526 static int evalsubshell(union node *, int);
8527 static void expredir(union node *);
8528 static int evalpipe(union node *, int);
8529 static int evalcommand(union node *, int);
8530 static int evalbltin(const struct builtincmd *, int, char **, int);
8531 static void prehash(union node *);
8534 * Evaluate a parse tree. The value is left in the global variable
8538 evaltree(union node *n, int flags)
8540 struct jmploc *volatile savehandler = exception_handler;
8541 struct jmploc jmploc;
8543 int (*evalfn)(union node *, int);
8547 SAVE_INT(int_level);
8550 TRACE(("evaltree(NULL) called\n"));
8553 TRACE(("evaltree(%p: %d, %d) called\n", n, n->type, flags));
8557 exception_handler = &jmploc;
8559 int err = setjmp(jmploc.loc);
8561 /* if it was a signal, check for trap handlers */
8562 if (exception_type == EXSIG) {
8563 TRACE(("exception %d (EXSIG) in evaltree, err=%d\n",
8564 exception_type, err));
8567 /* continue on the way out */
8568 TRACE(("exception %d in evaltree, propagating err=%d\n",
8569 exception_type, err));
8570 exception_handler = savehandler;
8571 longjmp(exception_handler->loc, err);
8578 out1fmt("Node type = %d\n", n->type);
8583 status = !evaltree(n->nnot.com, EV_TESTED);
8586 expredir(n->nredir.redirect);
8587 status = redirectsafe(n->nredir.redirect, REDIR_PUSH);
8589 status = evaltree(n->nredir.n, flags & EV_TESTED);
8591 popredir(/*drop:*/ 0, /*restore:*/ 0 /* not sure */);
8594 evalfn = evalcommand;
8596 if (eflag && !(flags & EV_TESTED))
8607 evalfn = evalsubshell;
8610 evalfn = evalsubshell;
8623 #error NAND + 1 != NOR
8625 #if NOR + 1 != NSEMI
8626 #error NOR + 1 != NSEMI
8628 unsigned is_or = n->type - NAND;
8631 (flags | ((is_or >> 1) - 1)) & EV_TESTED
8633 if ((!status) == is_or || evalskip)
8639 status = evalfn(n, flags);
8643 status = evaltree(n->nif.test, EV_TESTED);
8650 if (n->nif.elsepart) {
8651 n = n->nif.elsepart;
8657 defun(n->narg.text, n->narg.next);
8658 /* Not necessary. To test it:
8659 * "false; f() { qwerty; }; echo $?" should print 0.
8663 exitstatus = status;
8668 exception_handler = savehandler;
8671 /* Order of checks below is important:
8672 * signal handlers trigger before exit caused by "set -e".
8676 if (checkexit & status)
8677 raise_exception(EXEXIT);
8678 if (flags & EV_EXIT)
8679 raise_exception(EXEXIT);
8681 RESTORE_INT(int_level);
8682 TRACE(("leaving evaltree (no interrupts)\n"));
8687 #if !defined(__alpha__) || (defined(__GNUC__) && __GNUC__ >= 3)
8690 int evaltreenr(union node *, int) __attribute__ ((alias("evaltree"),__noreturn__));
8695 int skip = evalskip;
8702 if (--skipcount <= 0) {
8713 evalloop(union node *n, int flags)
8724 i = evaltree(n->nbinary.ch1, EV_TESTED);
8726 if (skip == SKIPFUNC)
8730 if (n->type != NWHILE)
8734 status = evaltree(n->nbinary.ch2, flags);
8736 } while (!(skip & ~SKIPCONT));
8743 evalfor(union node *n, int flags)
8745 struct arglist arglist;
8748 struct stackmark smark;
8751 setstackmark(&smark);
8752 arglist.list = NULL;
8753 arglist.lastp = &arglist.list;
8754 for (argp = n->nfor.args; argp; argp = argp->narg.next) {
8755 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
8757 *arglist.lastp = NULL;
8761 for (sp = arglist.list; sp; sp = sp->next) {
8762 setvar0(n->nfor.var, sp->text);
8763 status = evaltree(n->nfor.body, flags);
8764 if (skiploop() & ~SKIPCONT)
8768 popstackmark(&smark);
8774 evalcase(union node *n, int flags)
8778 struct arglist arglist;
8779 struct stackmark smark;
8782 setstackmark(&smark);
8783 arglist.list = NULL;
8784 arglist.lastp = &arglist.list;
8785 expandarg(n->ncase.expr, &arglist, EXP_TILDE);
8786 for (cp = n->ncase.cases; cp && evalskip == 0; cp = cp->nclist.next) {
8787 for (patp = cp->nclist.pattern; patp; patp = patp->narg.next) {
8788 if (casematch(patp, arglist.list->text)) {
8789 /* Ensure body is non-empty as otherwise
8790 * EV_EXIT may prevent us from setting the
8793 if (evalskip == 0 && cp->nclist.body) {
8794 status = evaltree(cp->nclist.body, flags);
8801 popstackmark(&smark);
8807 * Kick off a subshell to evaluate a tree.
8810 evalsubshell(union node *n, int flags)
8813 int backgnd = (n->type == NBACKGND);
8816 expredir(n->nredir.redirect);
8817 if (!backgnd && (flags & EV_EXIT) && !may_have_traps)
8820 jp = makejob(/*n,*/ 1);
8821 if (forkshell(jp, n, backgnd) == 0) {
8826 flags &= ~EV_TESTED;
8828 redirect(n->nredir.redirect, 0);
8829 evaltreenr(n->nredir.n, flags);
8834 status = waitforjob(jp);
8840 * Compute the names of the files in a redirection list.
8842 static void fixredir(union node *, const char *, int);
8844 expredir(union node *n)
8848 for (redir = n; redir; redir = redir->nfile.next) {
8852 fn.lastp = &fn.list;
8853 switch (redir->type) {
8857 #if ENABLE_ASH_BASH_COMPAT
8862 expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR);
8863 TRACE(("expredir expanded to '%s'\n", fn.list->text));
8864 #if ENABLE_ASH_BASH_COMPAT
8868 // By the design of stack allocator, the loop of this kind:
8869 // while true; do while true; do break; done </dev/null; done
8870 // will look like a memory leak: ash plans to free expfname's
8871 // of "/dev/null" as soon as it finishes running the loop
8872 // (in this case, never).
8873 // This "fix" is wrong:
8874 if (redir->nfile.expfname)
8875 stunalloc(redir->nfile.expfname);
8876 // It results in corrupted state of stacked allocations.
8878 redir->nfile.expfname = fn.list->text;
8881 case NTOFD: /* >& */
8882 if (redir->ndup.vname) {
8883 expandarg(redir->ndup.vname, &fn, EXP_FULL | EXP_TILDE);
8884 if (fn.list == NULL)
8885 ash_msg_and_raise_error("redir error");
8886 #if ENABLE_ASH_BASH_COMPAT
8887 //FIXME: we used expandarg with different args!
8888 if (!isdigit_str9(fn.list->text)) {
8889 /* >&file, not >&fd */
8890 if (redir->nfile.fd != 1) /* 123>&file - BAD */
8891 ash_msg_and_raise_error("redir error");
8893 goto store_expfname;
8896 fixredir(redir, fn.list->text, 1);
8904 * Evaluate a pipeline. All the processes in the pipeline are children
8905 * of the process creating the pipeline. (This differs from some versions
8906 * of the shell, which make the last process in a pipeline the parent
8910 evalpipe(union node *n, int flags)
8913 struct nodelist *lp;
8919 TRACE(("evalpipe(0x%lx) called\n", (long)n));
8921 for (lp = n->npipe.cmdlist; lp; lp = lp->next)
8925 jp = makejob(/*n,*/ pipelen);
8927 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
8931 if (pipe(pip) < 0) {
8933 ash_msg_and_raise_error("pipe call failed");
8936 if (forkshell(jp, lp->n, n->npipe.pipe_backgnd) == 0) {
8949 evaltreenr(lp->n, flags);
8955 /* Don't want to trigger debugging */
8959 if (n->npipe.pipe_backgnd == 0) {
8960 status = waitforjob(jp);
8961 TRACE(("evalpipe: job done exit status %d\n", status));
8969 * Controls whether the shell is interactive or not.
8972 setinteractive(int on)
8974 static smallint is_interactive;
8976 if (++on == is_interactive)
8978 is_interactive = on;
8982 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
8983 if (is_interactive > 1) {
8984 /* Looks like they want an interactive shell */
8985 static smallint did_banner;
8988 /* note: ash and hush share this string */
8989 out1fmt("\n\n%s %s\n"
8990 IF_ASH_HELP("Enter 'help' for a list of built-in commands.\n")
8993 "built-in shell (ash)"
9007 setinteractive(iflag);
9009 #if ENABLE_FEATURE_EDITING_VI
9011 line_input_state->flags |= VI_MODE;
9013 line_input_state->flags &= ~VI_MODE;
9015 viflag = 0; /* forcibly keep the option off */
9019 static struct localvar *localvars;
9022 * Called after a function returns.
9023 * Interrupts must be off.
9028 struct localvar *lvp;
9031 while ((lvp = localvars) != NULL) {
9032 localvars = lvp->next;
9034 TRACE(("poplocalvar %s\n", vp ? vp->var_text : "-"));
9035 if (vp == NULL) { /* $- saved */
9036 memcpy(optlist, lvp->text, sizeof(optlist));
9037 free((char*)lvp->text);
9039 } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) {
9040 unsetvar(vp->var_text);
9043 vp->var_func(var_end(lvp->text));
9044 if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
9045 free((char*)vp->var_text);
9046 vp->flags = lvp->flags;
9047 vp->var_text = lvp->text;
9054 evalfun(struct funcnode *func, int argc, char **argv, int flags)
9056 volatile struct shparam saveparam;
9057 struct localvar *volatile savelocalvars;
9058 struct jmploc *volatile savehandler;
9059 struct jmploc jmploc;
9062 saveparam = shellparam;
9063 savelocalvars = localvars;
9064 savehandler = exception_handler;
9065 e = setjmp(jmploc.loc);
9070 exception_handler = &jmploc;
9072 shellparam.malloced = 0;
9076 shellparam.nparam = argc - 1;
9077 shellparam.p = argv + 1;
9078 #if ENABLE_ASH_GETOPTS
9079 shellparam.optind = 1;
9080 shellparam.optoff = -1;
9082 evaltree(&func->n, flags & EV_TESTED);
9088 localvars = savelocalvars;
9089 freeparam(&shellparam);
9090 shellparam = saveparam;
9091 exception_handler = savehandler;
9093 evalskip &= ~SKIPFUNC;
9098 * Make a variable a local variable. When a variable is made local, it's
9099 * value and flags are saved in a localvar structure. The saved values
9100 * will be restored when the shell function returns. We handle the name
9101 * "-" as a special case: it makes changes to "set +-options" local
9102 * (options will be restored on return from the function).
9107 struct localvar *lvp;
9110 char *eq = strchr(name, '=');
9113 /* Cater for duplicate "local". Examples:
9114 * x=0; f() { local x=1; echo $x; local x; echo $x; }; f; echo $x
9115 * x=0; f() { local x=1; echo $x; local x=2; echo $x; }; f; echo $x
9119 if (lvp->vp && varcmp(lvp->vp->var_text, name) == 0) {
9123 * it's a duplicate "local VAR" declaration, do nothing
9130 lvp = ckzalloc(sizeof(*lvp));
9131 if (LONE_DASH(name)) {
9133 p = ckmalloc(sizeof(optlist));
9134 lvp->text = memcpy(p, optlist, sizeof(optlist));
9137 vpp = hashvar(name);
9138 vp = *findvar(vpp, name);
9140 /* variable did not exist yet */
9142 setvareq(name, VSTRFIXED);
9144 setvar(name, NULL, VSTRFIXED);
9145 vp = *vpp; /* the new variable */
9146 lvp->flags = VUNSET;
9148 lvp->text = vp->var_text;
9149 lvp->flags = vp->flags;
9150 /* make sure neither "struct var" nor string gets freed
9151 * during (un)setting:
9153 vp->flags |= VSTRFIXED|VTEXTFIXED;
9157 /* "local VAR" unsets VAR: */
9158 setvar0(name, NULL);
9162 lvp->next = localvars;
9168 * The "local" command.
9170 static int FAST_FUNC
9171 localcmd(int argc UNUSED_PARAM, char **argv)
9176 ash_msg_and_raise_error("not in a function");
9179 while ((name = *argv++) != NULL) {
9185 static int FAST_FUNC
9186 falsecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
9191 static int FAST_FUNC
9192 truecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
9197 static int FAST_FUNC
9198 execcmd(int argc UNUSED_PARAM, char **argv)
9201 iflag = 0; /* exit on error */
9204 /* We should set up signals for "exec CMD"
9205 * the same way as for "CMD" without "exec".
9206 * But optschanged->setinteractive->setsignal
9207 * still thought we are a root shell. Therefore, for example,
9208 * SIGQUIT is still set to IGN. Fix it:
9212 /*setsignal(SIGTERM); - unnecessary because of iflag=0 */
9213 /*setsignal(SIGTSTP); - unnecessary because of mflag=0 */
9214 /*setsignal(SIGTTOU); - unnecessary because of mflag=0 */
9216 shellexec(argv + 1, pathval(), 0);
9223 * The return command.
9225 static int FAST_FUNC
9226 returncmd(int argc UNUSED_PARAM, char **argv)
9229 * If called outside a function, do what ksh does;
9230 * skip the rest of the file.
9232 evalskip = SKIPFUNC;
9233 return argv[1] ? number(argv[1]) : exitstatus;
9236 /* Forward declarations for builtintab[] */
9237 static int breakcmd(int, char **) FAST_FUNC;
9238 static int dotcmd(int, char **) FAST_FUNC;
9239 static int evalcmd(int, char **, int) FAST_FUNC;
9240 static int exitcmd(int, char **) FAST_FUNC;
9241 static int exportcmd(int, char **) FAST_FUNC;
9242 #if ENABLE_ASH_GETOPTS
9243 static int getoptscmd(int, char **) FAST_FUNC;
9246 static int helpcmd(int, char **) FAST_FUNC;
9249 static int historycmd(int, char **) FAST_FUNC;
9251 #if ENABLE_SH_MATH_SUPPORT
9252 static int letcmd(int, char **) FAST_FUNC;
9254 static int readcmd(int, char **) FAST_FUNC;
9255 static int setcmd(int, char **) FAST_FUNC;
9256 static int shiftcmd(int, char **) FAST_FUNC;
9257 static int timescmd(int, char **) FAST_FUNC;
9258 static int trapcmd(int, char **) FAST_FUNC;
9259 static int umaskcmd(int, char **) FAST_FUNC;
9260 static int unsetcmd(int, char **) FAST_FUNC;
9261 static int ulimitcmd(int, char **) FAST_FUNC;
9263 #define BUILTIN_NOSPEC "0"
9264 #define BUILTIN_SPECIAL "1"
9265 #define BUILTIN_REGULAR "2"
9266 #define BUILTIN_SPEC_REG "3"
9267 #define BUILTIN_ASSIGN "4"
9268 #define BUILTIN_SPEC_ASSG "5"
9269 #define BUILTIN_REG_ASSG "6"
9270 #define BUILTIN_SPEC_REG_ASSG "7"
9272 /* Stubs for calling non-FAST_FUNC's */
9273 #if ENABLE_ASH_BUILTIN_ECHO
9274 static int FAST_FUNC echocmd(int argc, char **argv) { return echo_main(argc, argv); }
9276 #if ENABLE_ASH_BUILTIN_PRINTF
9277 static int FAST_FUNC printfcmd(int argc, char **argv) { return printf_main(argc, argv); }
9279 #if ENABLE_ASH_BUILTIN_TEST
9280 static int FAST_FUNC testcmd(int argc, char **argv) { return test_main(argc, argv); }
9283 /* Keep these in proper order since it is searched via bsearch() */
9284 static const struct builtincmd builtintab[] = {
9285 { BUILTIN_SPEC_REG "." , dotcmd },
9286 { BUILTIN_SPEC_REG ":" , truecmd },
9287 #if ENABLE_ASH_BUILTIN_TEST
9288 { BUILTIN_REGULAR "[" , testcmd },
9289 #if ENABLE_ASH_BASH_COMPAT
9290 { BUILTIN_REGULAR "[[" , testcmd },
9293 #if ENABLE_ASH_ALIAS
9294 { BUILTIN_REG_ASSG "alias" , aliascmd },
9297 { BUILTIN_REGULAR "bg" , fg_bgcmd },
9299 { BUILTIN_SPEC_REG "break" , breakcmd },
9300 { BUILTIN_REGULAR "cd" , cdcmd },
9301 { BUILTIN_NOSPEC "chdir" , cdcmd },
9302 #if ENABLE_ASH_CMDCMD
9303 { BUILTIN_REGULAR "command" , commandcmd },
9305 { BUILTIN_SPEC_REG "continue", breakcmd },
9306 #if ENABLE_ASH_BUILTIN_ECHO
9307 { BUILTIN_REGULAR "echo" , echocmd },
9309 { BUILTIN_SPEC_REG "eval" , NULL }, /*evalcmd() has a differing prototype*/
9310 { BUILTIN_SPEC_REG "exec" , execcmd },
9311 { BUILTIN_SPEC_REG "exit" , exitcmd },
9312 { BUILTIN_SPEC_REG_ASSG "export" , exportcmd },
9313 { BUILTIN_REGULAR "false" , falsecmd },
9315 { BUILTIN_REGULAR "fg" , fg_bgcmd },
9317 #if ENABLE_ASH_GETOPTS
9318 { BUILTIN_REGULAR "getopts" , getoptscmd },
9320 { BUILTIN_NOSPEC "hash" , hashcmd },
9322 { BUILTIN_NOSPEC "help" , helpcmd },
9325 { BUILTIN_NOSPEC "history" , historycmd },
9328 { BUILTIN_REGULAR "jobs" , jobscmd },
9329 { BUILTIN_REGULAR "kill" , killcmd },
9331 #if ENABLE_SH_MATH_SUPPORT
9332 { BUILTIN_NOSPEC "let" , letcmd },
9334 { BUILTIN_ASSIGN "local" , localcmd },
9335 #if ENABLE_ASH_BUILTIN_PRINTF
9336 { BUILTIN_REGULAR "printf" , printfcmd },
9338 { BUILTIN_NOSPEC "pwd" , pwdcmd },
9339 { BUILTIN_REGULAR "read" , readcmd },
9340 { BUILTIN_SPEC_REG_ASSG "readonly", exportcmd },
9341 { BUILTIN_SPEC_REG "return" , returncmd },
9342 { BUILTIN_SPEC_REG "set" , setcmd },
9343 { BUILTIN_SPEC_REG "shift" , shiftcmd },
9344 #if ENABLE_ASH_BASH_COMPAT
9345 { BUILTIN_SPEC_REG "source" , dotcmd },
9347 #if ENABLE_ASH_BUILTIN_TEST
9348 { BUILTIN_REGULAR "test" , testcmd },
9350 { BUILTIN_SPEC_REG "times" , timescmd },
9351 { BUILTIN_SPEC_REG "trap" , trapcmd },
9352 { BUILTIN_REGULAR "true" , truecmd },
9353 { BUILTIN_NOSPEC "type" , typecmd },
9354 { BUILTIN_NOSPEC "ulimit" , ulimitcmd },
9355 { BUILTIN_REGULAR "umask" , umaskcmd },
9356 #if ENABLE_ASH_ALIAS
9357 { BUILTIN_REGULAR "unalias" , unaliascmd },
9359 { BUILTIN_SPEC_REG "unset" , unsetcmd },
9360 { BUILTIN_REGULAR "wait" , waitcmd },
9363 /* Should match the above table! */
9364 #define COMMANDCMD (builtintab + \
9366 /* [ */ 1 * ENABLE_ASH_BUILTIN_TEST + \
9367 /* [[ */ 1 * ENABLE_ASH_BUILTIN_TEST * ENABLE_ASH_BASH_COMPAT + \
9368 /* alias */ 1 * ENABLE_ASH_ALIAS + \
9369 /* bg */ 1 * ENABLE_ASH_JOB_CONTROL + \
9370 /* break cd cddir */ 3)
9371 #define EVALCMD (COMMANDCMD + \
9372 /* command */ 1 * ENABLE_ASH_CMDCMD + \
9373 /* continue */ 1 + \
9374 /* echo */ 1 * ENABLE_ASH_BUILTIN_ECHO + \
9376 #define EXECCMD (EVALCMD + \
9380 * Search the table of builtin commands.
9383 pstrcmp1(const void *a, const void *b)
9385 return strcmp((char*)a, *(char**)b + 1);
9387 static struct builtincmd *
9388 find_builtin(const char *name)
9390 struct builtincmd *bp;
9393 name, builtintab, ARRAY_SIZE(builtintab), sizeof(builtintab[0]),
9400 * Execute a simple command.
9403 isassignment(const char *p)
9405 const char *q = endofname(p);
9410 static int FAST_FUNC
9411 bltincmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
9413 /* Preserve exitstatus of a previous possible redirection
9414 * as POSIX mandates */
9415 return back_exitstatus;
9418 evalcommand(union node *cmd, int flags)
9420 static const struct builtincmd null_bltin = {
9421 "\0\0", bltincmd /* why three NULs? */
9423 struct stackmark smark;
9425 struct arglist arglist;
9426 struct arglist varlist;
9429 const struct strlist *sp;
9430 struct cmdentry cmdentry;
9437 struct builtincmd *bcmd;
9438 smallint cmd_is_exec;
9439 smallint pseudovarflag = 0;
9441 /* First expand the arguments. */
9442 TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags));
9443 setstackmark(&smark);
9444 back_exitstatus = 0;
9446 cmdentry.cmdtype = CMDBUILTIN;
9447 cmdentry.u.cmd = &null_bltin;
9448 varlist.lastp = &varlist.list;
9449 *varlist.lastp = NULL;
9450 arglist.lastp = &arglist.list;
9451 *arglist.lastp = NULL;
9454 if (cmd->ncmd.args) {
9455 bcmd = find_builtin(cmd->ncmd.args->narg.text);
9456 pseudovarflag = bcmd && IS_BUILTIN_ASSIGN(bcmd);
9459 for (argp = cmd->ncmd.args; argp; argp = argp->narg.next) {
9460 struct strlist **spp;
9462 spp = arglist.lastp;
9463 if (pseudovarflag && isassignment(argp->narg.text))
9464 expandarg(argp, &arglist, EXP_VARTILDE);
9466 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
9468 for (sp = *spp; sp; sp = sp->next)
9472 argv = nargv = stalloc(sizeof(char *) * (argc + 1));
9473 for (sp = arglist.list; sp; sp = sp->next) {
9474 TRACE(("evalcommand arg: %s\n", sp->text));
9475 *nargv++ = sp->text;
9480 if (iflag && funcnest == 0 && argc > 0)
9481 lastarg = nargv[-1];
9484 expredir(cmd->ncmd.redirect);
9485 status = redirectsafe(cmd->ncmd.redirect, REDIR_PUSH | REDIR_SAVEFD2);
9487 path = vpath.var_text;
9488 for (argp = cmd->ncmd.assign; argp; argp = argp->narg.next) {
9489 struct strlist **spp;
9492 spp = varlist.lastp;
9493 expandarg(argp, &varlist, EXP_VARTILDE);
9496 * Modify the command lookup path, if a PATH= assignment
9500 if (varcmp(p, path) == 0)
9504 /* Print the command if xflag is set. */
9507 const char *p = " %s" + 1;
9509 fdprintf(preverrout_fd, p, expandstr(ps4val()));
9511 for (n = 0; n < 2; n++) {
9513 fdprintf(preverrout_fd, p, sp->text);
9519 safe_write(preverrout_fd, "\n", 1);
9525 /* Now locate the command. */
9527 int cmd_flag = DO_ERR;
9528 #if ENABLE_ASH_CMDCMD
9529 const char *oldpath = path + 5;
9533 find_command(argv[0], &cmdentry, cmd_flag, path);
9534 if (cmdentry.cmdtype == CMDUNKNOWN) {
9535 flush_stdout_stderr();
9540 /* implement bltin and command here */
9541 if (cmdentry.cmdtype != CMDBUILTIN)
9544 spclbltin = IS_BUILTIN_SPECIAL(cmdentry.u.cmd);
9545 if (cmdentry.u.cmd == EXECCMD)
9547 #if ENABLE_ASH_CMDCMD
9548 if (cmdentry.u.cmd == COMMANDCMD) {
9550 nargv = parse_command_args(argv, &path);
9553 /* It's "command [-p] PROG ARGS" (that is, no -Vv).
9554 * nargv => "PROG". path is updated if -p.
9556 argc -= nargv - argv;
9558 cmd_flag |= DO_NOFUNC;
9566 /* We have a redirection error. */
9568 raise_exception(EXERROR);
9570 exitstatus = status;
9574 /* Execute the command. */
9575 switch (cmdentry.cmdtype) {
9578 #if ENABLE_FEATURE_SH_NOFORK
9579 /* (1) BUG: if variables are set, we need to fork, or save/restore them
9580 * around run_nofork_applet() call.
9581 * (2) Should this check also be done in forkshell()?
9582 * (perhaps it should, so that "VAR=VAL nofork" at least avoids exec...)
9584 /* find_command() encodes applet_no as (-2 - applet_no) */
9585 int applet_no = (- cmdentry.u.index - 2);
9586 if (applet_no >= 0 && APPLET_IS_NOFORK(applet_no)) {
9587 listsetvar(varlist.list, VEXPORT|VSTACK);
9588 /* run <applet>_main() */
9589 status = run_nofork_applet(applet_no, argv);
9593 /* Can we avoid forking off? For example, very last command
9594 * in a script or a subshell does not need forking,
9595 * we can just exec it.
9597 if (!(flags & EV_EXIT) || may_have_traps) {
9598 /* No, forking off a child is necessary */
9600 jp = makejob(/*cmd,*/ 1);
9601 if (forkshell(jp, cmd, FORK_FG) != 0) {
9603 status = waitforjob(jp);
9605 TRACE(("forked child exited with %d\n", status));
9610 /* fall through to exec'ing external program */
9612 listsetvar(varlist.list, VEXPORT|VSTACK);
9613 shellexec(argv, path, cmdentry.u.index);
9617 cmdenviron = varlist.list;
9619 struct strlist *list = cmdenviron;
9621 if (spclbltin > 0 || argc == 0) {
9623 if (cmd_is_exec && argc > 1)
9626 listsetvar(list, i);
9628 /* Tight loop with builtins only:
9629 * "while kill -0 $child; do true; done"
9630 * will never exit even if $child died, unless we do this
9631 * to reap the zombie and make kill detect that it's gone: */
9632 dowait(DOWAIT_NONBLOCK, NULL);
9634 if (evalbltin(cmdentry.u.cmd, argc, argv, flags)) {
9636 int i = exception_type;
9641 exit_status = 128 + SIGINT;
9643 exit_status = 128 + pending_sig;
9644 exitstatus = exit_status;
9645 if (i == EXINT || spclbltin > 0) {
9647 longjmp(exception_handler->loc, 1);
9654 listsetvar(varlist.list, 0);
9655 /* See above for the rationale */
9656 dowait(DOWAIT_NONBLOCK, NULL);
9657 if (evalfun(cmdentry.u.func, argc, argv, flags))
9660 status = exitstatus;
9665 popredir(/*drop:*/ cmd_is_exec, /*restore:*/ cmd_is_exec);
9667 /* dsl: I think this is intended to be used to support
9668 * '_' in 'vi' command mode during line editing...
9669 * However I implemented that within libedit itself.
9671 setvar0("_", lastarg);
9673 popstackmark(&smark);
9679 evalbltin(const struct builtincmd *cmd, int argc, char **argv, int flags)
9681 char *volatile savecmdname;
9682 struct jmploc *volatile savehandler;
9683 struct jmploc jmploc;
9687 savecmdname = commandname;
9688 savehandler = exception_handler;
9689 i = setjmp(jmploc.loc);
9692 exception_handler = &jmploc;
9693 commandname = argv[0];
9695 optptr = NULL; /* initialize nextopt */
9697 status = evalcmd(argc, argv, flags);
9699 status = (*cmd->builtin)(argc, argv);
9700 flush_stdout_stderr();
9701 status |= ferror(stdout);
9702 exitstatus = status;
9705 commandname = savecmdname;
9706 exception_handler = savehandler;
9712 goodname(const char *p)
9714 return endofname(p)[0] == '\0';
9719 * Search for a command. This is called before we fork so that the
9720 * location of the command will be available in the parent as well as
9721 * the child. The check for "goodname" is an overly conservative
9722 * check that the name will not be subject to expansion.
9725 prehash(union node *n)
9727 struct cmdentry entry;
9729 if (n->type == NCMD && n->ncmd.args && goodname(n->ncmd.args->narg.text))
9730 find_command(n->ncmd.args->narg.text, &entry, 0, pathval());
9734 /* ============ Builtin commands
9736 * Builtin commands whose functions are closely tied to evaluation
9737 * are implemented here.
9741 * Handle break and continue commands. Break, continue, and return are
9742 * all handled by setting the evalskip flag. The evaluation routines
9743 * above all check this flag, and if it is set they start skipping
9744 * commands rather than executing them. The variable skipcount is
9745 * the number of loops to break/continue, or the number of function
9746 * levels to return. (The latter is always 1.) It should probably
9747 * be an error to break out of more loops than exist, but it isn't
9748 * in the standard shell so we don't make it one here.
9750 static int FAST_FUNC
9751 breakcmd(int argc UNUSED_PARAM, char **argv)
9753 int n = argv[1] ? number(argv[1]) : 1;
9756 ash_msg_and_raise_error(msg_illnum, argv[1]);
9760 evalskip = (**argv == 'c') ? SKIPCONT : SKIPBREAK;
9767 /* ============ input.c
9769 * This implements the input routines used by the parser.
9773 INPUT_PUSH_FILE = 1,
9774 INPUT_NOFILE_OK = 2,
9777 static smallint checkkwd;
9778 /* values of checkkwd variable */
9779 #define CHKALIAS 0x1
9784 * Push a string back onto the input at this current parsefile level.
9785 * We handle aliases this way.
9787 #if !ENABLE_ASH_ALIAS
9788 #define pushstring(s, ap) pushstring(s)
9791 pushstring(char *s, struct alias *ap)
9798 if (g_parsefile->strpush) {
9799 sp = ckzalloc(sizeof(*sp));
9800 sp->prev = g_parsefile->strpush;
9802 sp = &(g_parsefile->basestrpush);
9804 g_parsefile->strpush = sp;
9805 sp->prev_string = g_parsefile->next_to_pgetc;
9806 sp->prev_left_in_line = g_parsefile->left_in_line;
9807 sp->unget = g_parsefile->unget;
9808 memcpy(sp->lastc, g_parsefile->lastc, sizeof(sp->lastc));
9809 #if ENABLE_ASH_ALIAS
9812 ap->flag |= ALIASINUSE;
9816 g_parsefile->next_to_pgetc = s;
9817 g_parsefile->left_in_line = len;
9818 g_parsefile->unget = 0;
9825 struct strpush *sp = g_parsefile->strpush;
9828 #if ENABLE_ASH_ALIAS
9830 if (g_parsefile->next_to_pgetc[-1] == ' '
9831 || g_parsefile->next_to_pgetc[-1] == '\t'
9833 checkkwd |= CHKALIAS;
9835 if (sp->string != sp->ap->val) {
9838 sp->ap->flag &= ~ALIASINUSE;
9839 if (sp->ap->flag & ALIASDEAD) {
9840 unalias(sp->ap->name);
9844 g_parsefile->next_to_pgetc = sp->prev_string;
9845 g_parsefile->left_in_line = sp->prev_left_in_line;
9846 g_parsefile->unget = sp->unget;
9847 memcpy(g_parsefile->lastc, sp->lastc, sizeof(sp->lastc));
9848 g_parsefile->strpush = sp->prev;
9849 if (sp != &(g_parsefile->basestrpush))
9858 char *buf = g_parsefile->buf;
9860 g_parsefile->next_to_pgetc = buf;
9861 #if ENABLE_FEATURE_EDITING
9863 if (!iflag || g_parsefile->pf_fd != STDIN_FILENO)
9864 nr = nonblock_immune_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1);
9867 # if ENABLE_ASH_IDLE_TIMEOUT
9869 const char *tmout_var = lookupvar("TMOUT");
9871 timeout = atoi(tmout_var) * 1000;
9877 # if ENABLE_FEATURE_TAB_COMPLETION
9878 line_input_state->path_lookup = pathval();
9880 reinit_unicode_for_ash();
9881 nr = read_line_input(line_input_state, cmdedit_prompt, buf, IBUFSIZ, timeout);
9883 /* Ctrl+C pressed */
9894 /* Ctrl+D pressed */
9897 # if ENABLE_ASH_IDLE_TIMEOUT
9898 else if (errno == EAGAIN && timeout > 0) {
9899 puts("\007timed out waiting for input: auto-logout");
9906 nr = nonblock_immune_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1);
9909 #if 0 /* disabled: nonblock_immune_read() handles this problem */
9911 if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
9912 int flags = fcntl(0, F_GETFL);
9913 if (flags >= 0 && (flags & O_NONBLOCK)) {
9914 flags &= ~O_NONBLOCK;
9915 if (fcntl(0, F_SETFL, flags) >= 0) {
9916 out2str("sh: turning off NDELAY mode\n");
9927 * Refill the input buffer and return the next input character:
9929 * 1) If a string was pushed back on the input, pop it;
9930 * 2) If an EOF was pushed back (g_parsefile->left_in_line < -BIGNUM)
9931 * or we are reading from a string so we can't refill the buffer,
9933 * 3) If there is more stuff in this buffer, use it else call read to fill it.
9934 * 4) Process input up to the next newline, deleting nul characters.
9936 //#define pgetc_debug(...) bb_error_msg(__VA_ARGS__)
9937 #define pgetc_debug(...) ((void)0)
9938 static int pgetc(void);
9945 if (g_parsefile->strpush) {
9946 #if ENABLE_ASH_ALIAS
9947 if (g_parsefile->left_in_line == -1
9948 && g_parsefile->strpush->ap
9949 && g_parsefile->next_to_pgetc[-1] != ' '
9950 && g_parsefile->next_to_pgetc[-1] != '\t'
9952 pgetc_debug("preadbuffer PEOA");
9959 /* on both branches above g_parsefile->left_in_line < 0.
9960 * "pgetc" needs refilling.
9963 /* -90 is our -BIGNUM. Below we use -99 to mark "EOF on read",
9964 * pungetc() may increment it a few times.
9965 * Assuming it won't increment it to less than -90.
9967 if (g_parsefile->left_in_line < -90 || g_parsefile->buf == NULL) {
9968 pgetc_debug("preadbuffer PEOF1");
9969 /* even in failure keep left_in_line and next_to_pgetc
9970 * in lock step, for correct multi-layer pungetc.
9971 * left_in_line was decremented before preadbuffer(),
9972 * must inc next_to_pgetc: */
9973 g_parsefile->next_to_pgetc++;
9977 more = g_parsefile->left_in_buffer;
9979 flush_stdout_stderr();
9983 /* don't try reading again */
9984 g_parsefile->left_in_line = -99;
9985 pgetc_debug("preadbuffer PEOF2");
9986 g_parsefile->next_to_pgetc++;
9991 /* Find out where's the end of line.
9992 * Set g_parsefile->left_in_line
9993 * and g_parsefile->left_in_buffer acordingly.
9994 * NUL chars are deleted.
9996 q = g_parsefile->next_to_pgetc;
10004 memmove(q, q + 1, more);
10008 g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1;
10014 g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1;
10015 if (g_parsefile->left_in_line < 0)
10020 g_parsefile->left_in_buffer = more;
10025 out2str(g_parsefile->next_to_pgetc);
10029 pgetc_debug("preadbuffer at %d:%p'%s'",
10030 g_parsefile->left_in_line,
10031 g_parsefile->next_to_pgetc,
10032 g_parsefile->next_to_pgetc);
10033 return (unsigned char)*g_parsefile->next_to_pgetc++;
10039 g_parsefile->linno++;
10040 setprompt_if(doprompt, 2);
10045 g_parsefile->linno++;
10046 needprompt = doprompt;
10054 pgetc_debug("pgetc at %d:%p'%s'",
10055 g_parsefile->left_in_line,
10056 g_parsefile->next_to_pgetc,
10057 g_parsefile->next_to_pgetc);
10058 if (g_parsefile->unget)
10059 return g_parsefile->lastc[--g_parsefile->unget];
10061 if (--g_parsefile->left_in_line >= 0)
10062 c = (signed char)*g_parsefile->next_to_pgetc++;
10066 g_parsefile->lastc[1] = g_parsefile->lastc[0];
10067 g_parsefile->lastc[0] = c;
10072 #if ENABLE_ASH_ALIAS
10074 pgetc_without_PEOA(void)
10078 pgetc_debug("pgetc at %d:%p'%s'",
10079 g_parsefile->left_in_line,
10080 g_parsefile->next_to_pgetc,
10081 g_parsefile->next_to_pgetc);
10083 } while (c == PEOA);
10087 # define pgetc_without_PEOA() pgetc()
10091 * Read a line from the script.
10094 pfgets(char *line, int len)
10100 while (--nleft > 0) {
10101 c = pgetc_without_PEOA();
10116 * Undo a call to pgetc. Only two characters may be pushed back.
10117 * PEOF may be pushed back.
10122 g_parsefile->unget++;
10125 /* This one eats backslash+newline */
10131 while ((c = pgetc()) == '\\') {
10132 if (pgetc() != '\n') {
10144 * To handle the "." command, a stack of input files is used. Pushfile
10145 * adds a new entry to the stack and popfile restores the previous level.
10150 struct parsefile *pf;
10152 pf = ckzalloc(sizeof(*pf));
10153 pf->prev = g_parsefile;
10155 /*pf->strpush = NULL; - ckzalloc did it */
10156 /*pf->basestrpush.prev = NULL;*/
10164 struct parsefile *pf = g_parsefile;
10167 if (pf->pf_fd >= 0)
10170 while (pf->strpush)
10172 g_parsefile = pf->prev;
10178 * Return to top level.
10183 while (g_parsefile != &basepf)
10188 * Close the file(s) that the shell is reading commands from. Called
10189 * after a fork is done.
10195 if (g_parsefile->pf_fd > 0) {
10196 close(g_parsefile->pf_fd);
10197 g_parsefile->pf_fd = 0;
10202 * Like setinputfile, but takes an open file descriptor. Call this with
10206 setinputfd(int fd, int push)
10208 close_on_exec_on(fd);
10211 g_parsefile->buf = NULL;
10213 g_parsefile->pf_fd = fd;
10214 if (g_parsefile->buf == NULL)
10215 g_parsefile->buf = ckmalloc(IBUFSIZ);
10216 g_parsefile->left_in_buffer = 0;
10217 g_parsefile->left_in_line = 0;
10218 g_parsefile->linno = 1;
10222 * Set the input to take input from a file. If push is set, push the
10223 * old input onto the stack first.
10226 setinputfile(const char *fname, int flags)
10232 fd = open(fname, O_RDONLY);
10234 if (flags & INPUT_NOFILE_OK)
10237 ash_msg_and_raise_error("can't open '%s'", fname);
10240 fd2 = copyfd(fd, 10);
10243 ash_msg_and_raise_error("out of file descriptors");
10246 setinputfd(fd, flags & INPUT_PUSH_FILE);
10253 * Like setinputfile, but takes input from a string.
10256 setinputstring(char *string)
10260 g_parsefile->next_to_pgetc = string;
10261 g_parsefile->left_in_line = strlen(string);
10262 g_parsefile->buf = NULL;
10263 g_parsefile->linno = 1;
10268 /* ============ mail.c
10270 * Routines to check for mail.
10273 #if ENABLE_ASH_MAIL
10275 /* Hash of mtimes of mailboxes */
10276 static unsigned mailtime_hash;
10277 /* Set if MAIL or MAILPATH is changed. */
10278 static smallint mail_var_path_changed;
10281 * Print appropriate message(s) if mail has arrived.
10282 * If mail_var_path_changed is set,
10283 * then the value of MAIL has mail_var_path_changed,
10284 * so we just update the values.
10293 struct stackmark smark;
10296 setstackmark(&smark);
10297 mpath = mpathset() ? mpathval() : mailval();
10300 p = path_advance(&mpath, nullstr);
10305 for (q = p; *q; q++)
10311 q[-1] = '\0'; /* delete trailing '/' */
10312 if (stat(p, &statb) < 0) {
10315 /* Very simplistic "hash": just a sum of all mtimes */
10316 new_hash += (unsigned)statb.st_mtime;
10318 if (!mail_var_path_changed && mailtime_hash != new_hash) {
10319 if (mailtime_hash != 0)
10320 out2str("you have mail\n");
10321 mailtime_hash = new_hash;
10323 mail_var_path_changed = 0;
10324 popstackmark(&smark);
10327 static void FAST_FUNC
10328 changemail(const char *val UNUSED_PARAM)
10330 mail_var_path_changed = 1;
10333 #endif /* ASH_MAIL */
10336 /* ============ ??? */
10339 * Set the shell parameters.
10342 setparam(char **argv)
10348 for (nparam = 0; argv[nparam]; nparam++)
10350 ap = newparam = ckmalloc((nparam + 1) * sizeof(*ap));
10352 *ap++ = ckstrdup(*argv++);
10355 freeparam(&shellparam);
10356 shellparam.malloced = 1;
10357 shellparam.nparam = nparam;
10358 shellparam.p = newparam;
10359 #if ENABLE_ASH_GETOPTS
10360 shellparam.optind = 1;
10361 shellparam.optoff = -1;
10366 * Process shell options. The global variable argptr contains a pointer
10367 * to the argument list; we advance it past the options.
10369 * SUSv3 section 2.8.1 "Consequences of Shell Errors" says:
10370 * For a non-interactive shell, an error condition encountered
10371 * by a special built-in ... shall cause the shell to write a diagnostic message
10372 * to standard error and exit as shown in the following table:
10373 * Error Special Built-In
10375 * Utility syntax error (option or operand error) Shall exit
10377 * However, in bug 1142 (http://busybox.net/bugs/view.php?id=1142)
10378 * we see that bash does not do that (set "finishes" with error code 1 instead,
10379 * and shell continues), and people rely on this behavior!
10381 * set -o barfoo 2>/dev/null
10384 * Oh well. Let's mimic that.
10387 plus_minus_o(char *name, int val)
10392 for (i = 0; i < NOPTS; i++) {
10393 if (strcmp(name, optnames(i)) == 0) {
10398 ash_msg("illegal option %co %s", val ? '-' : '+', name);
10401 for (i = 0; i < NOPTS; i++) {
10403 out1fmt("%-16s%s\n", optnames(i), optlist[i] ? "on" : "off");
10405 out1fmt("set %co %s\n", optlist[i] ? '-' : '+', optnames(i));
10411 setoption(int flag, int val)
10415 for (i = 0; i < NOPTS; i++) {
10416 if (optletters(i) == flag) {
10421 ash_msg_and_raise_error("illegal option %c%c", val ? '-' : '+', flag);
10425 options(int cmdline)
10433 while ((p = *argptr) != NULL) {
10435 if (c != '-' && c != '+')
10438 val = 0; /* val = 0 if c == '+' */
10441 if (p[0] == '\0' || LONE_DASH(p)) {
10443 /* "-" means turn off -x and -v */
10446 /* "--" means reset params */
10447 else if (*argptr == NULL)
10450 break; /* "-" or "--" terminates options */
10453 /* first char was + or - */
10454 while ((c = *p++) != '\0') {
10455 /* bash 3.2 indeed handles -c CMD and +c CMD the same */
10456 if (c == 'c' && cmdline) {
10457 minusc = p; /* command is after shell args */
10458 } else if (c == 'o') {
10459 if (plus_minus_o(*argptr, val)) {
10460 /* it already printed err message */
10461 return 1; /* error */
10465 } else if (cmdline && (c == 'l')) { /* -l or +l == --login */
10467 /* bash does not accept +-login, we also won't */
10468 } else if (cmdline && val && (c == '-')) { /* long options */
10469 if (strcmp(p, "login") == 0)
10481 * The shift builtin command.
10483 static int FAST_FUNC
10484 shiftcmd(int argc UNUSED_PARAM, char **argv)
10491 n = number(argv[1]);
10492 if (n > shellparam.nparam)
10493 n = 0; /* bash compat, was = shellparam.nparam; */
10495 shellparam.nparam -= n;
10496 for (ap1 = shellparam.p; --n >= 0; ap1++) {
10497 if (shellparam.malloced)
10500 ap2 = shellparam.p;
10501 while ((*ap2++ = *ap1++) != NULL)
10503 #if ENABLE_ASH_GETOPTS
10504 shellparam.optind = 1;
10505 shellparam.optoff = -1;
10512 * POSIX requires that 'set' (but not export or readonly) output the
10513 * variables in lexicographic order - by the locale's collating order (sigh).
10514 * Maybe we could keep them in an ordered balanced binary tree
10515 * instead of hashed lists.
10516 * For now just roll 'em through qsort for printing...
10519 showvars(const char *sep_prefix, int on, int off)
10522 char **ep, **epend;
10524 ep = listvars(on, off, &epend);
10525 qsort(ep, epend - ep, sizeof(char *), vpcmp);
10527 sep = *sep_prefix ? " " : sep_prefix;
10529 for (; ep < epend; ep++) {
10533 p = strchrnul(*ep, '=');
10536 q = single_quote(++p);
10537 out1fmt("%s%s%.*s%s\n", sep_prefix, sep, (int)(p - *ep), *ep, q);
10543 * The set command builtin.
10545 static int FAST_FUNC
10546 setcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
10551 return showvars(nullstr, 0, VUNSET);
10554 retval = options(/*cmdline:*/ 0);
10555 if (retval == 0) { /* if no parse error... */
10557 if (*argptr != NULL) {
10565 #if ENABLE_ASH_RANDOM_SUPPORT
10566 static void FAST_FUNC
10567 change_random(const char *value)
10571 if (value == NULL) {
10572 /* "get", generate */
10573 t = next_random(&random_gen);
10574 /* set without recursion */
10575 setvar(vrandom.var_text, utoa(t), VNOFUNC);
10576 vrandom.flags &= ~VNOFUNC;
10579 t = strtoul(value, NULL, 10);
10580 INIT_RANDOM_T(&random_gen, (t ? t : 1), t);
10585 #if ENABLE_ASH_GETOPTS
10587 getopts(char *optstr, char *optvar, char **optfirst, int *param_optind, int *optoff)
10598 if (*param_optind < 1)
10600 optnext = optfirst + *param_optind - 1;
10602 if (*param_optind <= 1 || *optoff < 0 || (int)strlen(optnext[-1]) < *optoff)
10605 p = optnext[-1] + *optoff;
10606 if (p == NULL || *p == '\0') {
10607 /* Current word is done, advance */
10609 if (p == NULL || *p != '-' || *++p == '\0') {
10616 if (LONE_DASH(p)) /* check for "--" */
10621 for (q = optstr; *q != c;) {
10623 if (optstr[0] == ':') {
10625 /*sbuf[1] = '\0'; - already is */
10626 err |= setvarsafe("OPTARG", sbuf, 0);
10628 fprintf(stderr, "Illegal option -%c\n", c);
10629 unsetvar("OPTARG");
10639 if (*p == '\0' && (p = *optnext) == NULL) {
10640 if (optstr[0] == ':') {
10642 /*sbuf[1] = '\0'; - already is */
10643 err |= setvarsafe("OPTARG", sbuf, 0);
10646 fprintf(stderr, "No arg for -%c option\n", c);
10647 unsetvar("OPTARG");
10655 err |= setvarsafe("OPTARG", p, 0);
10658 err |= setvarsafe("OPTARG", nullstr, 0);
10660 *optoff = p ? p - *(optnext - 1) : -1;
10661 *param_optind = optnext - optfirst + 1;
10662 err |= setvarsafe("OPTIND", itoa(*param_optind), VNOFUNC);
10664 /*sbuf[1] = '\0'; - already is */
10665 err |= setvarsafe(optvar, sbuf, 0);
10669 flush_stdout_stderr();
10670 raise_exception(EXERROR);
10676 * The getopts builtin. Shellparam.optnext points to the next argument
10677 * to be processed. Shellparam.optptr points to the next character to
10678 * be processed in the current argument. If shellparam.optnext is NULL,
10679 * then it's the first time getopts has been called.
10681 static int FAST_FUNC
10682 getoptscmd(int argc, char **argv)
10687 ash_msg_and_raise_error("usage: getopts optstring var [arg]");
10689 optbase = shellparam.p;
10690 if (shellparam.optind > shellparam.nparam + 1) {
10691 shellparam.optind = 1;
10692 shellparam.optoff = -1;
10695 optbase = &argv[3];
10696 if (shellparam.optind > argc - 2) {
10697 shellparam.optind = 1;
10698 shellparam.optoff = -1;
10702 return getopts(argv[1], argv[2], optbase, &shellparam.optind,
10703 &shellparam.optoff);
10705 #endif /* ASH_GETOPTS */
10708 /* ============ Shell parser */
10711 struct heredoc *next; /* next here document in list */
10712 union node *here; /* redirection node */
10713 char *eofmark; /* string indicating end of input */
10714 smallint striptabs; /* if set, strip leading tabs */
10717 static smallint tokpushback; /* last token pushed back */
10718 static smallint quoteflag; /* set if (part of) last token was quoted */
10719 static token_id_t lasttoken; /* last token read (integer id Txxx) */
10720 static struct heredoc *heredoclist; /* list of here documents to read */
10721 static char *wordtext; /* text of last word returned by readtoken */
10722 static struct nodelist *backquotelist;
10723 static union node *redirnode;
10724 static struct heredoc *heredoc;
10726 static const char *
10727 tokname(char *buf, int tok)
10730 return tokname_array[tok];
10731 sprintf(buf, "\"%s\"", tokname_array[tok]);
10735 /* raise_error_unexpected_syntax:
10736 * Called when an unexpected token is read during the parse. The argument
10737 * is the token that is expected, or -1 if more than one type of token can
10738 * occur at this point.
10740 static void raise_error_unexpected_syntax(int) NORETURN;
10742 raise_error_unexpected_syntax(int token)
10748 l = sprintf(msg, "unexpected %s", tokname(buf, lasttoken));
10750 sprintf(msg + l, " (expecting %s)", tokname(buf, token));
10751 raise_error_syntax(msg);
10755 #define EOFMARKLEN 79
10757 /* parsing is heavily cross-recursive, need these forward decls */
10758 static union node *andor(void);
10759 static union node *pipeline(void);
10760 static union node *parse_command(void);
10761 static void parseheredoc(void);
10762 static int peektoken(void);
10763 static int readtoken(void);
10765 static union node *
10768 union node *n1, *n2, *n3;
10773 switch (peektoken()) {
10781 if (!n1 && (nlflag & 1))
10787 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10788 if (nlflag == 2 && ((1 << peektoken()) & tokendlist))
10794 if (tok == TBACKGND) {
10795 if (n2->type == NPIPE) {
10796 n2->npipe.pipe_backgnd = 1;
10798 if (n2->type != NREDIR) {
10799 n3 = stzalloc(sizeof(struct nredir));
10801 /*n3->nredir.redirect = NULL; - stzalloc did it */
10804 n2->type = NBACKGND;
10810 n3 = stzalloc(sizeof(struct nbinary));
10812 n3->nbinary.ch1 = n1;
10813 n3->nbinary.ch2 = n2;
10826 raise_error_unexpected_syntax(-1);
10833 static union node *
10836 union node *n1, *n2, *n3;
10844 } else if (t == TOR) {
10850 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10852 n3 = stzalloc(sizeof(struct nbinary));
10854 n3->nbinary.ch1 = n1;
10855 n3->nbinary.ch2 = n2;
10860 static union node *
10863 union node *n1, *n2, *pipenode;
10864 struct nodelist *lp, *prev;
10868 TRACE(("pipeline: entered\n"));
10869 if (readtoken() == TNOT) {
10871 checkkwd = CHKKWD | CHKALIAS;
10874 n1 = parse_command();
10875 if (readtoken() == TPIPE) {
10876 pipenode = stzalloc(sizeof(struct npipe));
10877 pipenode->type = NPIPE;
10878 /*pipenode->npipe.pipe_backgnd = 0; - stzalloc did it */
10879 lp = stzalloc(sizeof(struct nodelist));
10880 pipenode->npipe.cmdlist = lp;
10884 lp = stzalloc(sizeof(struct nodelist));
10885 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10886 lp->n = parse_command();
10888 } while (readtoken() == TPIPE);
10894 n2 = stzalloc(sizeof(struct nnot));
10902 static union node *
10907 n = stzalloc(sizeof(struct narg));
10909 /*n->narg.next = NULL; - stzalloc did it */
10910 n->narg.text = wordtext;
10911 n->narg.backquote = backquotelist;
10916 fixredir(union node *n, const char *text, int err)
10920 TRACE(("Fix redir %s %d\n", text, err));
10922 n->ndup.vname = NULL;
10924 fd = bb_strtou(text, NULL, 10);
10925 if (!errno && fd >= 0)
10926 n->ndup.dupfd = fd;
10927 else if (LONE_DASH(text))
10928 n->ndup.dupfd = -1;
10931 raise_error_syntax("bad fd number");
10932 n->ndup.vname = makename();
10937 * Returns true if the text contains nothing to expand (no dollar signs
10941 noexpand(const char *text)
10945 while ((c = *text++) != '\0') {
10946 if (c == CTLQUOTEMARK)
10950 else if (SIT(c, BASESYNTAX) == CCTL)
10959 union node *n = redirnode;
10961 if (readtoken() != TWORD)
10962 raise_error_unexpected_syntax(-1);
10963 if (n->type == NHERE) {
10964 struct heredoc *here = heredoc;
10968 if (quoteflag == 0)
10970 TRACE(("Here document %d\n", n->type));
10971 if (!noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN)
10972 raise_error_syntax("illegal eof marker for << redirection");
10973 rmescapes(wordtext, 0);
10974 here->eofmark = wordtext;
10976 if (heredoclist == NULL)
10977 heredoclist = here;
10979 for (p = heredoclist; p->next; p = p->next)
10983 } else if (n->type == NTOFD || n->type == NFROMFD) {
10984 fixredir(n, wordtext, 0);
10986 n->nfile.fname = makename();
10990 static union node *
10993 union node *args, **app;
10994 union node *n = NULL;
10995 union node *vars, **vpp;
10996 union node **rpp, *redir;
10998 #if ENABLE_ASH_BASH_COMPAT
10999 smallint double_brackets_flag = 0;
11000 smallint function_flag = 0;
11010 savecheckkwd = CHKALIAS;
11013 checkkwd = savecheckkwd;
11016 #if ENABLE_ASH_BASH_COMPAT
11018 if (peektoken() != TWORD)
11019 raise_error_unexpected_syntax(TWORD);
11022 case TAND: /* "&&" */
11023 case TOR: /* "||" */
11024 if (!double_brackets_flag) {
11028 wordtext = (char *) (t == TAND ? "-a" : "-o");
11031 n = stzalloc(sizeof(struct narg));
11033 /*n->narg.next = NULL; - stzalloc did it */
11034 n->narg.text = wordtext;
11035 #if ENABLE_ASH_BASH_COMPAT
11036 if (strcmp("[[", wordtext) == 0)
11037 double_brackets_flag = 1;
11038 else if (strcmp("]]", wordtext) == 0)
11039 double_brackets_flag = 0;
11041 n->narg.backquote = backquotelist;
11042 if (savecheckkwd && isassignment(wordtext)) {
11044 vpp = &n->narg.next;
11047 app = &n->narg.next;
11050 #if ENABLE_ASH_BASH_COMPAT
11051 if (function_flag) {
11052 checkkwd = CHKNL | CHKKWD;
11053 switch (peektoken()) {
11065 if (strcmp("[[", wordtext) == 0)
11069 raise_error_unexpected_syntax(-1);
11075 *rpp = n = redirnode;
11076 rpp = &n->nfile.next;
11077 parsefname(); /* read name of redirection file */
11080 IF_ASH_BASH_COMPAT(do_func:)
11081 if (args && app == &args->narg.next
11084 struct builtincmd *bcmd;
11087 /* We have a function */
11088 if (IF_ASH_BASH_COMPAT(!function_flag &&) readtoken() != TRP)
11089 raise_error_unexpected_syntax(TRP);
11090 name = n->narg.text;
11091 if (!goodname(name)
11092 || ((bcmd = find_builtin(name)) && IS_BUILTIN_SPECIAL(bcmd))
11094 raise_error_syntax("bad function name");
11097 checkkwd = CHKNL | CHKKWD | CHKALIAS;
11098 n->narg.next = parse_command();
11101 IF_ASH_BASH_COMPAT(function_flag = 0;)
11112 n = stzalloc(sizeof(struct ncmd));
11114 n->ncmd.args = args;
11115 n->ncmd.assign = vars;
11116 n->ncmd.redirect = redir;
11120 static union node *
11121 parse_command(void)
11123 union node *n1, *n2;
11124 union node *ap, **app;
11125 union node *cp, **cpp;
11126 union node *redir, **rpp;
11133 switch (readtoken()) {
11135 raise_error_unexpected_syntax(-1);
11138 n1 = stzalloc(sizeof(struct nif));
11140 n1->nif.test = list(0);
11141 if (readtoken() != TTHEN)
11142 raise_error_unexpected_syntax(TTHEN);
11143 n1->nif.ifpart = list(0);
11145 while (readtoken() == TELIF) {
11146 n2->nif.elsepart = stzalloc(sizeof(struct nif));
11147 n2 = n2->nif.elsepart;
11149 n2->nif.test = list(0);
11150 if (readtoken() != TTHEN)
11151 raise_error_unexpected_syntax(TTHEN);
11152 n2->nif.ifpart = list(0);
11154 if (lasttoken == TELSE)
11155 n2->nif.elsepart = list(0);
11157 n2->nif.elsepart = NULL;
11165 n1 = stzalloc(sizeof(struct nbinary));
11166 n1->type = (lasttoken == TWHILE) ? NWHILE : NUNTIL;
11167 n1->nbinary.ch1 = list(0);
11170 TRACE(("expecting DO got '%s' %s\n", tokname_array[got],
11171 got == TWORD ? wordtext : ""));
11172 raise_error_unexpected_syntax(TDO);
11174 n1->nbinary.ch2 = list(0);
11179 if (readtoken() != TWORD || quoteflag || !goodname(wordtext))
11180 raise_error_syntax("bad for loop variable");
11181 n1 = stzalloc(sizeof(struct nfor));
11183 n1->nfor.var = wordtext;
11184 checkkwd = CHKNL | CHKKWD | CHKALIAS;
11185 if (readtoken() == TIN) {
11187 while (readtoken() == TWORD) {
11188 n2 = stzalloc(sizeof(struct narg));
11190 /*n2->narg.next = NULL; - stzalloc did it */
11191 n2->narg.text = wordtext;
11192 n2->narg.backquote = backquotelist;
11194 app = &n2->narg.next;
11197 n1->nfor.args = ap;
11198 if (lasttoken != TNL && lasttoken != TSEMI)
11199 raise_error_unexpected_syntax(-1);
11201 n2 = stzalloc(sizeof(struct narg));
11203 /*n2->narg.next = NULL; - stzalloc did it */
11204 n2->narg.text = (char *)dolatstr;
11205 /*n2->narg.backquote = NULL;*/
11206 n1->nfor.args = n2;
11208 * Newline or semicolon here is optional (but note
11209 * that the original Bourne shell only allowed NL).
11211 if (lasttoken != TSEMI)
11214 checkkwd = CHKNL | CHKKWD | CHKALIAS;
11215 if (readtoken() != TDO)
11216 raise_error_unexpected_syntax(TDO);
11217 n1->nfor.body = list(0);
11221 n1 = stzalloc(sizeof(struct ncase));
11223 if (readtoken() != TWORD)
11224 raise_error_unexpected_syntax(TWORD);
11225 n1->ncase.expr = n2 = stzalloc(sizeof(struct narg));
11227 /*n2->narg.next = NULL; - stzalloc did it */
11228 n2->narg.text = wordtext;
11229 n2->narg.backquote = backquotelist;
11230 checkkwd = CHKNL | CHKKWD | CHKALIAS;
11231 if (readtoken() != TIN)
11232 raise_error_unexpected_syntax(TIN);
11233 cpp = &n1->ncase.cases;
11235 checkkwd = CHKNL | CHKKWD;
11237 while (t != TESAC) {
11238 if (lasttoken == TLP)
11240 *cpp = cp = stzalloc(sizeof(struct nclist));
11242 app = &cp->nclist.pattern;
11244 *app = ap = stzalloc(sizeof(struct narg));
11246 /*ap->narg.next = NULL; - stzalloc did it */
11247 ap->narg.text = wordtext;
11248 ap->narg.backquote = backquotelist;
11249 if (readtoken() != TPIPE)
11251 app = &ap->narg.next;
11254 //ap->narg.next = NULL;
11255 if (lasttoken != TRP)
11256 raise_error_unexpected_syntax(TRP);
11257 cp->nclist.body = list(2);
11259 cpp = &cp->nclist.next;
11261 checkkwd = CHKNL | CHKKWD;
11265 raise_error_unexpected_syntax(TENDCASE);
11272 n1 = stzalloc(sizeof(struct nredir));
11273 n1->type = NSUBSHELL;
11274 n1->nredir.n = list(0);
11275 /*n1->nredir.redirect = NULL; - stzalloc did it */
11282 IF_ASH_BASH_COMPAT(case TFUNCTION:)
11286 return simplecmd();
11289 if (readtoken() != t)
11290 raise_error_unexpected_syntax(t);
11293 /* Now check for redirection which may follow command */
11294 checkkwd = CHKKWD | CHKALIAS;
11296 while (readtoken() == TREDIR) {
11297 *rpp = n2 = redirnode;
11298 rpp = &n2->nfile.next;
11304 if (n1->type != NSUBSHELL) {
11305 n2 = stzalloc(sizeof(struct nredir));
11310 n1->nredir.redirect = redir;
11315 #if ENABLE_ASH_BASH_COMPAT
11317 decode_dollar_squote(void)
11319 static const char C_escapes[] ALIGN1 = "nrbtfav""x\\01234567";
11325 p = strchr(C_escapes, c);
11330 if ((unsigned char)(c - '0') <= 7) { /* \ooo */
11334 } while ((unsigned char)(c - '0') <= 7 && --cnt);
11336 } else if (c == 'x') { /* \xHH */
11340 } while (isxdigit(c) && --cnt);
11342 if (cnt == 3) { /* \x but next char is "bad" */
11346 } else { /* simple seq like \\ or \t */
11351 c = bb_process_escape_sequence((void*)&p);
11352 } else { /* unrecognized "\z": print both chars unless ' or " */
11353 if (c != '\'' && c != '"') {
11355 c |= 0x100; /* "please encode \, then me" */
11363 * If eofmark is NULL, read a word or a redirection symbol. If eofmark
11364 * is not NULL, read a here document. In the latter case, eofmark is the
11365 * word which marks the end of the document and striptabs is true if
11366 * leading tabs should be stripped from the document. The argument c
11367 * is the first character of the input token or document.
11369 * Because C does not have internal subroutines, I have simulated them
11370 * using goto's to implement the subroutine linkage. The following macros
11371 * will run code that appears at the end of readtoken1.
11373 #define CHECKEND() {goto checkend; checkend_return:;}
11374 #define PARSEREDIR() {goto parseredir; parseredir_return:;}
11375 #define PARSESUB() {goto parsesub; parsesub_return:;}
11376 #define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;}
11377 #define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;}
11378 #define PARSEARITH() {goto parsearith; parsearith_return:;}
11380 readtoken1(int c, int syntax, char *eofmark, int striptabs)
11382 /* NB: syntax parameter fits into smallint */
11383 /* c parameter is an unsigned char or PEOF or PEOA */
11386 char line[EOFMARKLEN + 1];
11387 struct nodelist *bqlist;
11391 smallint prevsyntax; /* syntax before arithmetic */
11392 #if ENABLE_ASH_EXPAND_PRMT
11393 smallint pssyntax; /* we are expanding a prompt string */
11395 int varnest; /* levels of variables expansion */
11396 int arinest; /* levels of arithmetic expansion */
11397 int parenlevel; /* levels of parens in arithmetic */
11398 int dqvarnest; /* levels of variables expansion within double quotes */
11400 IF_ASH_BASH_COMPAT(smallint bash_dollar_squote = 0;)
11402 startlinno = g_parsefile->linno;
11406 #if ENABLE_ASH_EXPAND_PRMT
11407 pssyntax = (syntax == PSSYNTAX);
11411 dblquote = (syntax == DQSYNTAX);
11417 STARTSTACKSTR(out);
11419 /* For each line, until end of word */
11420 CHECKEND(); /* set c to PEOF if at end of here document */
11421 for (;;) { /* until end of line or end of word */
11422 CHECKSTRSPACE(4, out); /* permit 4 calls to USTPUTC */
11423 switch (SIT(c, syntax)) {
11424 case CNL: /* '\n' */
11425 if (syntax == BASESYNTAX)
11426 goto endword; /* exit outer loop */
11430 goto loop; /* continue outer loop */
11435 #if ENABLE_ASH_BASH_COMPAT
11436 if (c == '\\' && bash_dollar_squote) {
11437 c = decode_dollar_squote();
11439 /* skip $'\000', $'\x00' (like bash) */
11443 /* Unknown escape. Encode as '\z' */
11444 c = (unsigned char)c;
11445 if (eofmark == NULL || dblquote)
11446 USTPUTC(CTLESC, out);
11447 USTPUTC('\\', out);
11451 if (eofmark == NULL || dblquote)
11452 USTPUTC(CTLESC, out);
11455 case CBACK: /* backslash */
11456 c = pgetc_without_PEOA();
11458 USTPUTC(CTLESC, out);
11459 USTPUTC('\\', out);
11461 } else if (c == '\n') {
11464 #if ENABLE_ASH_EXPAND_PRMT
11465 if (c == '$' && pssyntax) {
11466 USTPUTC(CTLESC, out);
11467 USTPUTC('\\', out);
11470 /* Backslash is retained if we are in "str" and next char isn't special */
11475 && (c != '"' || eofmark != NULL)
11477 USTPUTC('\\', out);
11479 USTPUTC(CTLESC, out);
11487 if (eofmark == NULL) {
11488 USTPUTC(CTLQUOTEMARK, out);
11496 IF_ASH_BASH_COMPAT(bash_dollar_squote = 0;)
11497 if (eofmark != NULL && varnest == 0) {
11500 if (dqvarnest == 0) {
11501 syntax = BASESYNTAX;
11508 case CVAR: /* '$' */
11509 PARSESUB(); /* parse substitution */
11511 case CENDVAR: /* '}' */
11514 if (dqvarnest > 0) {
11521 #if ENABLE_SH_MATH_SUPPORT
11522 case CLP: /* '(' in arithmetic */
11526 case CRP: /* ')' in arithmetic */
11527 if (parenlevel > 0) {
11530 if (pgetc_eatbnl() == ')') {
11532 if (--arinest == 0) {
11533 syntax = prevsyntax;
11537 * unbalanced parens
11538 * (don't 2nd guess - no error)
11546 case CBQUOTE: /* '`' */
11550 goto endword; /* exit outer loop */
11554 if (varnest == 0) {
11555 #if ENABLE_ASH_BASH_COMPAT
11557 //Can't call pgetc_eatbnl() here, this requires three-deep pungetc()
11558 if (pgetc() == '>')
11559 c = 0x100 + '>'; /* flag &> */
11563 goto endword; /* exit outer loop */
11565 IF_ASH_ALIAS(if (c != PEOA))
11572 #if ENABLE_SH_MATH_SUPPORT
11573 if (syntax == ARISYNTAX)
11574 raise_error_syntax("missing '))'");
11576 if (syntax != BASESYNTAX && eofmark == NULL)
11577 raise_error_syntax("unterminated quoted string");
11578 if (varnest != 0) {
11579 startlinno = g_parsefile->linno;
11581 raise_error_syntax("missing '}'");
11583 USTPUTC('\0', out);
11584 len = out - (char *)stackblock();
11585 out = stackblock();
11586 if (eofmark == NULL) {
11587 if ((c == '>' || c == '<' IF_ASH_BASH_COMPAT( || c == 0x100 + '>'))
11590 if (isdigit_str9(out)) {
11591 PARSEREDIR(); /* passed as params: out, c */
11592 lasttoken = TREDIR;
11595 /* else: non-number X seen, interpret it
11596 * as "NNNX>file" = "NNNX >file" */
11600 quoteflag = quotef;
11601 backquotelist = bqlist;
11602 grabstackblock(len);
11606 /* end of readtoken routine */
11609 * Check to see whether we are at the end of the here document. When this
11610 * is called, c is set to the first character of the next input line. If
11611 * we are at the end of the here document, this routine sets the c to PEOF.
11615 #if ENABLE_ASH_ALIAS
11617 c = pgetc_without_PEOA();
11620 while (c == '\t') {
11621 c = pgetc_without_PEOA();
11624 if (c == *eofmark) {
11625 if (pfgets(line, sizeof(line)) != NULL) {
11629 for (q = eofmark + 1; *q && *p == *q; p++, q++)
11631 if (*p == '\n' && *q == '\0') {
11635 pushstring(line, NULL);
11640 goto checkend_return;
11644 * Parse a redirection operator. The variable "out" points to a string
11645 * specifying the fd to be redirected. The variable "c" contains the
11646 * first character of the redirection operator.
11649 /* out is already checked to be a valid number or "" */
11650 int fd = (*out == '\0' ? -1 : atoi(out));
11653 np = stzalloc(sizeof(struct nfile));
11658 np->type = NAPPEND;
11660 np->type = NCLOBBER;
11663 /* it also can be NTO2 (>&file), but we can't figure it out yet */
11669 #if ENABLE_ASH_BASH_COMPAT
11670 else if (c == 0x100 + '>') { /* this flags &> redirection */
11672 pgetc(); /* this is '>', no need to check */
11676 else { /* c == '<' */
11677 /*np->nfile.fd = 0; - stzalloc did it */
11681 if (sizeof(struct nfile) != sizeof(struct nhere)) {
11682 np = stzalloc(sizeof(struct nhere));
11683 /*np->nfile.fd = 0; - stzalloc did it */
11686 heredoc = stzalloc(sizeof(struct heredoc));
11687 heredoc->here = np;
11690 heredoc->striptabs = 1;
11692 /*heredoc->striptabs = 0; - stzalloc did it */
11698 np->type = NFROMFD;
11702 np->type = NFROMTO;
11714 goto parseredir_return;
11718 * Parse a substitution. At this point, we have read the dollar sign
11719 * and nothing else.
11722 /* is_special(c) evaluates to 1 for c in "!#$*-0123456789?@"; 0 otherwise
11723 * (assuming ascii char codes, as the original implementation did) */
11724 #define is_special(c) \
11725 (((unsigned)(c) - 33 < 32) \
11726 && ((0xc1ff920dU >> ((unsigned)(c) - 33)) & 1))
11728 unsigned char subtype;
11732 c = pgetc_eatbnl();
11733 if (c > 255 /* PEOA or PEOF */
11734 || (c != '(' && c != '{' && !is_name(c) && !is_special(c))
11736 #if ENABLE_ASH_BASH_COMPAT
11737 if (syntax != DQSYNTAX && c == '\'')
11738 bash_dollar_squote = 1;
11743 } else if (c == '(') {
11744 /* $(command) or $((arith)) */
11745 if (pgetc_eatbnl() == '(') {
11746 #if ENABLE_SH_MATH_SUPPORT
11749 raise_error_syntax("you disabled math support for $((arith)) syntax");
11756 /* $VAR, $<specialchar>, ${...}, or PEOA/PEOF */
11757 USTPUTC(CTLVAR, out);
11758 typeloc = out - (char *)stackblock();
11759 USTPUTC(VSNORMAL, out);
11760 subtype = VSNORMAL;
11762 c = pgetc_eatbnl();
11764 c = pgetc_eatbnl();
11766 c = '#'; /* ${#} - same as $# */
11768 subtype = VSLENGTH; /* ${#VAR} */
11773 if (c <= 255 /* not PEOA or PEOF */ && is_name(c)) {
11774 /* $[{[#]]NAME[}] */
11777 c = pgetc_eatbnl();
11778 } while (c <= 255 /* not PEOA or PEOF */ && is_in_name(c));
11779 } else if (isdigit(c)) {
11780 /* $[{[#]]NUM[}] */
11783 c = pgetc_eatbnl();
11784 } while (isdigit(c));
11785 } else if (is_special(c)) {
11786 /* $[{[#]]<specialchar>[}] */
11788 c = pgetc_eatbnl();
11791 raise_error_syntax("bad substitution");
11793 if (c != '}' && subtype == VSLENGTH) {
11794 /* ${#VAR didn't end with } */
11800 if (subtype == 0) {
11801 static const char types[] ALIGN1 = "}-+?=";
11802 /* ${VAR...} but not $VAR or ${#VAR} */
11803 /* c == first char after VAR */
11806 c = pgetc_eatbnl();
11807 #if ENABLE_ASH_BASH_COMPAT
11808 /* This check is only needed to not misinterpret
11809 * ${VAR:-WORD}, ${VAR:+WORD}, ${VAR:=WORD}, ${VAR:?WORD}
11812 if (!strchr(types, c)) {
11813 subtype = VSSUBSTR;
11815 break; /* "goto do_pungetc" is bigger (!) */
11821 const char *p = strchr(types, c);
11824 subtype = p - types + VSNORMAL;
11830 subtype = (c == '#' ? VSTRIMLEFT : VSTRIMRIGHT);
11831 c = pgetc_eatbnl();
11837 #if ENABLE_ASH_BASH_COMPAT
11839 /* ${v/[/]pattern/repl} */
11840 //TODO: encode pattern and repl separately.
11841 // Currently ${v/$var_with_slash/repl} is horribly broken
11842 subtype = VSREPLACE;
11843 c = pgetc_eatbnl();
11846 subtype++; /* VSREPLACEALL */
11854 ((unsigned char *)stackblock())[typeloc] = subtype | flags;
11855 if (subtype != VSNORMAL) {
11862 goto parsesub_return;
11866 * Called to parse command substitutions. Newstyle is set if the command
11867 * is enclosed inside $(...); nlpp is a pointer to the head of the linked
11868 * list of commands (passed by reference), and savelen is the number of
11869 * characters on the top of the stack which must be preserved.
11872 struct nodelist **nlpp;
11876 smallint saveprompt = 0;
11879 savelen = out - (char *)stackblock();
11882 * FIXME: this can allocate very large block on stack and SEGV.
11884 * echo "..<100kbytes>..`true` $(true) `true` ..."
11885 * allocates 100kb for every command subst. With about
11886 * a hundred command substitutions stack overflows.
11887 * With larger prepended string, SEGV happens sooner.
11889 str = alloca(savelen);
11890 memcpy(str, stackblock(), savelen);
11894 /* We must read until the closing backquote, giving special
11895 * treatment to some slashes, and then push the string and
11896 * reread it as input, interpreting it normally.
11902 STARTSTACKSTR(pout);
11906 setprompt_if(needprompt, 2);
11917 * If eating a newline, avoid putting
11918 * the newline into the new character
11919 * stream (via the STPUTC after the
11924 if (pc != '\\' && pc != '`' && pc != '$'
11925 && (!dblquote || pc != '"')
11927 STPUTC('\\', pout);
11929 if (pc <= 255 /* not PEOA or PEOF */) {
11935 IF_ASH_ALIAS(case PEOA:)
11936 startlinno = g_parsefile->linno;
11937 raise_error_syntax("EOF in backquote substitution");
11949 STPUTC('\0', pout);
11950 psavelen = pout - (char *)stackblock();
11951 if (psavelen > 0) {
11952 pstr = grabstackstr(pout);
11953 setinputstring(pstr);
11958 nlpp = &(*nlpp)->next;
11959 *nlpp = stzalloc(sizeof(**nlpp));
11960 /* (*nlpp)->next = NULL; - stzalloc did it */
11963 saveprompt = doprompt;
11970 doprompt = saveprompt;
11971 else if (readtoken() != TRP)
11972 raise_error_unexpected_syntax(TRP);
11977 * Start reading from old file again, ignoring any pushed back
11978 * tokens left from the backquote parsing
11983 while (stackblocksize() <= savelen)
11985 STARTSTACKSTR(out);
11987 memcpy(out, str, savelen);
11988 STADJUST(savelen, out);
11990 USTPUTC(CTLBACKQ, out);
11992 goto parsebackq_oldreturn;
11993 goto parsebackq_newreturn;
11996 #if ENABLE_SH_MATH_SUPPORT
11998 * Parse an arithmetic expansion (indicate start of one and set state)
12001 if (++arinest == 1) {
12002 prevsyntax = syntax;
12003 syntax = ARISYNTAX;
12005 USTPUTC(CTLARI, out);
12006 goto parsearith_return;
12009 } /* end of readtoken */
12012 * Read the next input token.
12013 * If the token is a word, we set backquotelist to the list of cmds in
12014 * backquotes. We set quoteflag to true if any part of the word was
12016 * If the token is TREDIR, then we set redirnode to a structure containing
12018 * In all cases, the variable startlinno is set to the number of the line
12019 * on which the token starts.
12021 * [Change comment: here documents and internal procedures]
12022 * [Readtoken shouldn't have any arguments. Perhaps we should make the
12023 * word parsing code into a separate routine. In this case, readtoken
12024 * doesn't need to have any internal procedures, but parseword does.
12025 * We could also make parseoperator in essence the main routine, and
12026 * have parseword (readtoken1?) handle both words and redirection.]
12028 #define NEW_xxreadtoken
12029 #ifdef NEW_xxreadtoken
12030 /* singles must be first! */
12031 static const char xxreadtoken_chars[7] ALIGN1 = {
12032 '\n', '(', ')', /* singles */
12033 '&', '|', ';', /* doubles */
12037 #define xxreadtoken_singles 3
12038 #define xxreadtoken_doubles 3
12040 static const char xxreadtoken_tokens[] ALIGN1 = {
12041 TNL, TLP, TRP, /* only single occurrence allowed */
12042 TBACKGND, TPIPE, TSEMI, /* if single occurrence */
12043 TEOF, /* corresponds to trailing nul */
12044 TAND, TOR, TENDCASE /* if double occurrence */
12056 setprompt_if(needprompt, 2);
12057 startlinno = g_parsefile->linno;
12058 for (;;) { /* until token or start of word found */
12060 if (c == ' ' || c == '\t' IF_ASH_ALIAS( || c == PEOA))
12064 while ((c = pgetc()) != '\n' && c != PEOF)
12067 } else if (c == '\\') {
12068 if (pgetc() != '\n') {
12070 break; /* return readtoken1(...) */
12076 p = xxreadtoken_chars + sizeof(xxreadtoken_chars) - 1;
12082 p = strchr(xxreadtoken_chars, c);
12084 break; /* return readtoken1(...) */
12086 if ((int)(p - xxreadtoken_chars) >= xxreadtoken_singles) {
12088 if (cc == c) { /* double occurrence? */
12089 p += xxreadtoken_doubles + 1;
12092 #if ENABLE_ASH_BASH_COMPAT
12093 if (c == '&' && cc == '>') /* &> */
12094 break; /* return readtoken1(...) */
12099 lasttoken = xxreadtoken_tokens[p - xxreadtoken_chars];
12104 return readtoken1(c, BASESYNTAX, (char *) NULL, 0);
12106 #else /* old xxreadtoken */
12107 #define RETURN(token) return lasttoken = token
12117 setprompt_if(needprompt, 2);
12118 startlinno = g_parsefile->linno;
12119 for (;;) { /* until token or start of word found */
12122 case ' ': case '\t':
12123 IF_ASH_ALIAS(case PEOA:)
12126 while ((c = pgetc()) != '\n' && c != PEOF)
12131 if (pgetc() == '\n') {
12143 if (pgetc() == '&')
12148 if (pgetc() == '|')
12153 if (pgetc() == ';')
12166 return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
12169 #endif /* old xxreadtoken */
12175 int kwd = checkkwd;
12177 smallint alreadyseen = tokpushback;
12180 #if ENABLE_ASH_ALIAS
12196 if (t != TWORD || quoteflag) {
12201 * check for keywords
12203 if (kwd & CHKKWD) {
12204 const char *const *pp;
12206 pp = findkwd(wordtext);
12208 lasttoken = t = pp - tokname_array;
12209 TRACE(("keyword '%s' recognized\n", tokname_array[t]));
12214 if (checkkwd & CHKALIAS) {
12215 #if ENABLE_ASH_ALIAS
12217 ap = lookupalias(wordtext, 1);
12220 pushstring(ap->val, ap);
12230 TRACE(("token '%s' %s\n", tokname_array[t], t == TWORD ? wordtext : ""));
12232 TRACE(("reread token '%s' %s\n", tokname_array[t], t == TWORD ? wordtext : ""));
12248 * Read and parse a command. Returns NODE_EOF on end of file.
12249 * (NULL is a valid parse tree indicating a blank line.)
12251 static union node *
12252 parsecmd(int interact)
12257 doprompt = interact;
12258 setprompt_if(doprompt, doprompt);
12264 * Input any here documents.
12269 struct heredoc *here;
12272 here = heredoclist;
12273 heredoclist = NULL;
12276 setprompt_if(needprompt, 2);
12277 readtoken1(pgetc(), here->here->type == NHERE ? SQSYNTAX : DQSYNTAX,
12278 here->eofmark, here->striptabs);
12279 n = stzalloc(sizeof(struct narg));
12280 n->narg.type = NARG;
12281 /*n->narg.next = NULL; - stzalloc did it */
12282 n->narg.text = wordtext;
12283 n->narg.backquote = backquotelist;
12284 here->here->nhere.doc = n;
12291 * called by editline -- any expansions to the prompt should be added here.
12293 #if ENABLE_ASH_EXPAND_PRMT
12294 static const char *
12295 expandstr(const char *ps)
12299 /* XXX Fix (char *) cast. It _is_ a bug. ps is variable's value,
12300 * and token processing _can_ alter it (delete NULs etc). */
12301 setinputstring((char *)ps);
12302 readtoken1(pgetc(), PSSYNTAX, nullstr, 0);
12305 n.narg.type = NARG;
12306 n.narg.next = NULL;
12307 n.narg.text = wordtext;
12308 n.narg.backquote = backquotelist;
12310 expandarg(&n, NULL, EXP_QUOTED);
12311 return stackblock();
12316 * Execute a command or commands contained in a string.
12319 evalstring(char *s, int flags)
12322 struct stackmark smark;
12327 setstackmark(&smark);
12330 while ((n = parsecmd(0)) != NODE_EOF) {
12333 i = evaltree(n, flags);
12336 popstackmark(&smark);
12340 popstackmark(&smark);
12348 * The eval command.
12350 static int FAST_FUNC
12351 evalcmd(int argc UNUSED_PARAM, char **argv, int flags)
12360 STARTSTACKSTR(concat);
12362 concat = stack_putstr(p, concat);
12366 STPUTC(' ', concat);
12368 STPUTC('\0', concat);
12369 p = grabstackstr(concat);
12371 return evalstring(p, flags & EV_TESTED);
12377 * Read and execute commands.
12378 * "Top" is nonzero for the top level command loop;
12379 * it turns on prompting if the shell is interactive.
12385 struct stackmark smark;
12390 TRACE(("cmdloop(%d) called\n", top));
12394 setstackmark(&smark);
12397 showjobs(SHOW_CHANGED|SHOW_STDERR);
12400 if (iflag && top) {
12404 n = parsecmd(inter);
12406 if (DEBUG > 2 && debug && (n != NODE_EOF))
12409 if (n == NODE_EOF) {
12410 if (!top || numeof >= 50)
12412 if (!stoppedjobs()) {
12415 out2str("\nUse \"exit\" to leave shell.\n");
12418 } else if (nflag == 0) {
12421 /* job_warning can only be 2,1,0. Here 2->1, 1/0->0 */
12424 i = evaltree(n, 0);
12428 popstackmark(&smark);
12432 evalskip &= ~SKIPFUNC;
12440 * Take commands from a file. To be compatible we should do a path
12441 * search for the file, which is necessary to find sub-commands.
12444 find_dot_file(char *name)
12447 const char *path = pathval();
12450 /* don't try this for absolute or relative paths */
12451 if (strchr(name, '/'))
12454 /* IIRC standards do not say whether . is to be searched.
12455 * And it is even smaller this way, making it unconditional for now:
12457 if (1) { /* ENABLE_ASH_BASH_COMPAT */
12462 while ((fullname = path_advance(&path, name)) != NULL) {
12464 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
12466 * Don't bother freeing here, since it will
12467 * be freed by the caller.
12471 if (fullname != name)
12472 stunalloc(fullname);
12475 /* not found in the PATH */
12476 ash_msg_and_raise_error("%s: not found", name);
12480 static int FAST_FUNC
12481 dotcmd(int argc_ UNUSED_PARAM, char **argv_ UNUSED_PARAM)
12483 /* "false; . empty_file; echo $?" should print 0, not 1: */
12487 struct strlist *sp;
12488 volatile struct shparam saveparam;
12490 for (sp = cmdenviron; sp; sp = sp->next)
12491 setvareq(ckstrdup(sp->text), VSTRFIXED | VTEXTFIXED);
12493 nextopt(nullstr); /* handle possible "--" */
12497 /* bash says: "bash: .: filename argument required" */
12498 return 2; /* bash compat */
12501 /* This aborts if file isn't found, which is POSIXly correct.
12502 * bash returns exitcode 1 instead.
12504 fullname = find_dot_file(argv[0]);
12506 if (argv[0]) { /* . FILE ARGS, ARGS exist */
12508 saveparam = shellparam;
12509 shellparam.malloced = 0;
12513 shellparam.nparam = argc;
12514 shellparam.p = argv;
12517 /* This aborts if file can't be opened, which is POSIXly correct.
12518 * bash returns exitcode 1 instead.
12520 setinputfile(fullname, INPUT_PUSH_FILE);
12521 commandname = fullname;
12522 status = cmdloop(0);
12526 freeparam(&shellparam);
12527 shellparam = saveparam;
12533 static int FAST_FUNC
12534 exitcmd(int argc UNUSED_PARAM, char **argv)
12539 exitstatus = number(argv[1]);
12540 raise_exception(EXEXIT);
12545 * Read a file containing shell functions.
12548 readcmdfile(char *name)
12550 setinputfile(name, INPUT_PUSH_FILE);
12556 /* ============ find_command inplementation */
12559 * Resolve a command name. If you change this routine, you may have to
12560 * change the shellexec routine as well.
12563 find_command(char *name, struct cmdentry *entry, int act, const char *path)
12565 struct tblentry *cmdp;
12572 struct builtincmd *bcmd;
12574 /* If name contains a slash, don't use PATH or hash table */
12575 if (strchr(name, '/') != NULL) {
12576 entry->u.index = -1;
12577 if (act & DO_ABS) {
12578 while (stat(name, &statb) < 0) {
12580 if (errno == EINTR)
12583 entry->cmdtype = CMDUNKNOWN;
12587 entry->cmdtype = CMDNORMAL;
12591 /* #if ENABLE_FEATURE_SH_STANDALONE... moved after builtin check */
12593 updatetbl = (path == pathval());
12596 if (strstr(path, "%builtin") != NULL)
12597 act |= DO_ALTBLTIN;
12600 /* If name is in the table, check answer will be ok */
12601 cmdp = cmdlookup(name, 0);
12602 if (cmdp != NULL) {
12605 switch (cmdp->cmdtype) {
12623 } else if (cmdp->rehash == 0)
12624 /* if not invalidated by cd, we're done */
12628 /* If %builtin not in path, check for builtin next */
12629 bcmd = find_builtin(name);
12631 if (IS_BUILTIN_REGULAR(bcmd))
12632 goto builtin_success;
12633 if (act & DO_ALTPATH) {
12634 if (!(act & DO_ALTBLTIN))
12635 goto builtin_success;
12636 } else if (builtinloc <= 0) {
12637 goto builtin_success;
12641 #if ENABLE_FEATURE_SH_STANDALONE
12643 int applet_no = find_applet_by_name(name);
12644 if (applet_no >= 0) {
12645 entry->cmdtype = CMDNORMAL;
12646 entry->u.index = -2 - applet_no;
12652 /* We have to search path. */
12653 prev = -1; /* where to start */
12654 if (cmdp && cmdp->rehash) { /* doing a rehash */
12655 if (cmdp->cmdtype == CMDBUILTIN)
12658 prev = cmdp->param.index;
12664 while ((fullname = path_advance(&path, name)) != NULL) {
12665 stunalloc(fullname);
12666 /* NB: code below will still use fullname
12667 * despite it being "unallocated" */
12670 if (prefix(pathopt, "builtin")) {
12672 goto builtin_success;
12675 if ((act & DO_NOFUNC)
12676 || !prefix(pathopt, "func")
12677 ) { /* ignore unimplemented options */
12681 /* if rehash, don't redo absolute path names */
12682 if (fullname[0] == '/' && idx <= prev) {
12685 TRACE(("searchexec \"%s\": no change\n", name));
12688 while (stat(fullname, &statb) < 0) {
12690 if (errno == EINTR)
12693 if (errno != ENOENT && errno != ENOTDIR)
12697 e = EACCES; /* if we fail, this will be the error */
12698 if (!S_ISREG(statb.st_mode))
12700 if (pathopt) { /* this is a %func directory */
12701 stalloc(strlen(fullname) + 1);
12702 /* NB: stalloc will return space pointed by fullname
12703 * (because we don't have any intervening allocations
12704 * between stunalloc above and this stalloc) */
12705 readcmdfile(fullname);
12706 cmdp = cmdlookup(name, 0);
12707 if (cmdp == NULL || cmdp->cmdtype != CMDFUNCTION)
12708 ash_msg_and_raise_error("%s not defined in %s", name, fullname);
12709 stunalloc(fullname);
12712 TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
12714 entry->cmdtype = CMDNORMAL;
12715 entry->u.index = idx;
12719 cmdp = cmdlookup(name, 1);
12720 cmdp->cmdtype = CMDNORMAL;
12721 cmdp->param.index = idx;
12726 /* We failed. If there was an entry for this command, delete it */
12727 if (cmdp && updatetbl)
12728 delete_cmd_entry();
12730 ash_msg("%s: %s", name, errmsg(e, "not found"));
12731 entry->cmdtype = CMDUNKNOWN;
12736 entry->cmdtype = CMDBUILTIN;
12737 entry->u.cmd = bcmd;
12741 cmdp = cmdlookup(name, 1);
12742 cmdp->cmdtype = CMDBUILTIN;
12743 cmdp->param.cmd = bcmd;
12747 entry->cmdtype = cmdp->cmdtype;
12748 entry->u = cmdp->param;
12753 * The trap builtin.
12755 static int FAST_FUNC
12756 trapcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12760 int signo, exitcode;
12765 for (signo = 0; signo < NSIG; signo++) {
12766 char *tr = trap_ptr[signo];
12768 /* note: bash adds "SIG", but only if invoked
12769 * as "bash". If called as "sh", or if set -o posix,
12770 * then it prints short signal names.
12771 * We are printing short names: */
12772 out1fmt("trap -- %s %s\n",
12774 get_signame(signo));
12775 /* trap_ptr != trap only if we are in special-cased `trap` code.
12776 * In this case, we will exit very soon, no need to free(). */
12777 /* if (trap_ptr != trap && tp[0]) */
12782 if (trap_ptr != trap) {
12795 signo = get_signum(*ap);
12797 /* Mimic bash message exactly */
12798 ash_msg("%s: invalid signal specification", *ap);
12804 if (LONE_DASH(action))
12807 action = ckstrdup(action);
12811 may_have_traps = 1;
12812 trap[signo] = action;
12823 /* ============ Builtins */
12825 #if ENABLE_ASH_HELP
12826 static int FAST_FUNC
12827 helpcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12833 "Built-in commands:\n"
12834 "------------------\n");
12835 for (col = 0, i = 0; i < ARRAY_SIZE(builtintab); i++) {
12836 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '),
12837 builtintab[i].name + 1);
12843 # if ENABLE_FEATURE_SH_STANDALONE
12845 const char *a = applet_names;
12847 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '), a);
12852 while (*a++ != '\0')
12857 newline_and_flush(stdout);
12858 return EXIT_SUCCESS;
12863 static int FAST_FUNC
12864 historycmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12866 show_history(line_input_state);
12867 return EXIT_SUCCESS;
12872 * The export and readonly commands.
12874 static int FAST_FUNC
12875 exportcmd(int argc UNUSED_PARAM, char **argv)
12885 /* "readonly" in bash accepts, but ignores -n.
12886 * We do the same: it saves a conditional in nextopt's param.
12889 while ((opt = nextopt("np")) != '\0') {
12891 flag_off = VEXPORT;
12894 if (argv[0][0] == 'r') {
12896 flag_off = 0; /* readonly ignores -n */
12898 flag_off = ~flag_off;
12900 /*if (opt_p_not_specified) - bash doesnt check this. Try "export -p NAME" */
12906 p = strchr(name, '=');
12910 vp = *findvar(hashvar(name), name);
12912 vp->flags = ((vp->flags | flag) & flag_off);
12916 setvar(name, p, (flag & flag_off));
12917 } while ((name = *++aptr) != NULL);
12922 /* No arguments. Show the list of exported or readonly vars.
12925 showvars(argv[0], flag, 0);
12930 * Delete a function if it exists.
12933 unsetfunc(const char *name)
12935 struct tblentry *cmdp;
12937 cmdp = cmdlookup(name, 0);
12938 if (cmdp != NULL && cmdp->cmdtype == CMDFUNCTION)
12939 delete_cmd_entry();
12943 * The unset builtin command. We unset the function before we unset the
12944 * variable to allow a function to be unset when there is a readonly variable
12945 * with the same name.
12947 static int FAST_FUNC
12948 unsetcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12955 while ((i = nextopt("vf")) != 0) {
12959 for (ap = argptr; *ap; ap++) {
12972 static const unsigned char timescmd_str[] ALIGN1 = {
12973 ' ', offsetof(struct tms, tms_utime),
12974 '\n', offsetof(struct tms, tms_stime),
12975 ' ', offsetof(struct tms, tms_cutime),
12976 '\n', offsetof(struct tms, tms_cstime),
12979 static int FAST_FUNC
12980 timescmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12982 unsigned long clk_tck, s, t;
12983 const unsigned char *p;
12986 clk_tck = bb_clk_tck();
12991 t = *(clock_t *)(((char *) &buf) + p[1]);
12994 out1fmt("%lum%lu.%03lus%c",
12996 (t * 1000) / clk_tck,
13004 #if ENABLE_SH_MATH_SUPPORT
13006 * The let builtin. Partially stolen from GNU Bash, the Bourne Again SHell.
13007 * Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
13009 * Copyright (C) 2003 Vladimir Oleynik <dzo@simtreas.ru>
13011 static int FAST_FUNC
13012 letcmd(int argc UNUSED_PARAM, char **argv)
13018 ash_msg_and_raise_error("expression expected");
13020 i = ash_arith(*argv);
13028 * The read builtin. Options:
13029 * -r Do not interpret '\' specially
13030 * -s Turn off echo (tty only)
13031 * -n NCHARS Read NCHARS max
13032 * -p PROMPT Display PROMPT on stderr (if input is from tty)
13033 * -t SECONDS Timeout after SECONDS (tty or pipe only)
13034 * -u FD Read from given FD instead of fd 0
13035 * This uses unbuffered input, which may be avoidable in some cases.
13036 * TODO: bash also has:
13037 * -a ARRAY Read into array[0],[1],etc
13038 * -d DELIM End on DELIM char, not newline
13039 * -e Use line editing (tty only)
13041 static int FAST_FUNC
13042 readcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
13044 char *opt_n = NULL;
13045 char *opt_p = NULL;
13046 char *opt_t = NULL;
13047 char *opt_u = NULL;
13048 int read_flags = 0;
13052 while ((i = nextopt("p:u:rt:n:s")) != '\0') {
13061 read_flags |= BUILTIN_READ_SILENT;
13067 read_flags |= BUILTIN_READ_RAW;
13077 /* "read -s" needs to save/restore termios, can't allow ^C
13078 * to jump out of it.
13081 r = shell_builtin_read(setvar0,
13083 bltinlookup("IFS"), /* can be NULL */
13092 if ((uintptr_t)r > 1)
13093 ash_msg_and_raise_error(r);
13095 return (uintptr_t)r;
13098 static int FAST_FUNC
13099 umaskcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
13101 static const char permuser[3] ALIGN1 = "ogu";
13104 int symbolic_mode = 0;
13106 while (nextopt("S") != '\0') {
13115 if (*argptr == NULL) {
13116 if (symbolic_mode) {
13117 char buf[sizeof(",u=rwx,g=rwx,o=rwx")];
13124 *p++ = permuser[i];
13126 /* mask is 0..0uuugggooo. i=2 selects uuu bits */
13127 if (!(mask & 0400)) *p++ = 'r';
13128 if (!(mask & 0200)) *p++ = 'w';
13129 if (!(mask & 0100)) *p++ = 'x';
13137 out1fmt("%04o\n", mask);
13140 char *modestr = *argptr;
13141 /* numeric umasks are taken as-is */
13142 /* symbolic umasks are inverted: "umask a=rx" calls umask(222) */
13143 if (!isdigit(modestr[0]))
13145 mask = bb_parse_mode(modestr, mask);
13146 if ((unsigned)mask > 0777) {
13147 ash_msg_and_raise_error("illegal mode: %s", modestr);
13149 if (!isdigit(modestr[0]))
13156 static int FAST_FUNC
13157 ulimitcmd(int argc UNUSED_PARAM, char **argv)
13159 return shell_builtin_ulimit(argv);
13162 /* ============ main() and helpers */
13165 * Called to exit the shell.
13174 #if ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
13175 save_history(line_input_state);
13177 status = exitstatus;
13178 TRACE(("pid %d, exitshell(%d)\n", getpid(), status));
13179 if (setjmp(loc.loc)) {
13180 if (exception_type == EXEXIT)
13181 status = exitstatus;
13184 exception_handler = &loc;
13190 /*free(p); - we'll exit soon */
13192 flush_stdout_stderr();
13194 /* dash wraps setjobctl(0) in "if (setjmp(loc.loc) == 0) {...}".
13195 * our setjobctl(0) does not panic if tcsetpgrp fails inside it.
13205 /* we will never free this */
13206 basepf.next_to_pgetc = basepf.buf = ckmalloc(IBUFSIZ);
13208 signal(SIGCHLD, SIG_DFL);
13209 /* bash re-enables SIGHUP which is SIG_IGNed on entry.
13210 * Try: "trap '' HUP; bash; echo RET" and type "kill -HUP $$"
13212 signal(SIGHUP, SIG_DFL);
13217 struct stat st1, st2;
13220 for (envp = environ; envp && *envp; envp++) {
13221 p = endofname(*envp);
13222 if (p != *envp && *p == '=') {
13223 setvareq(*envp, VEXPORT|VTEXTFIXED);
13227 setvareq((char*)defoptindvar, VTEXTFIXED);
13229 setvar0("PPID", utoa(getppid()));
13230 #if ENABLE_ASH_BASH_COMPAT
13231 p = lookupvar("SHLVL");
13232 setvar("SHLVL", utoa((p ? atoi(p) : 0) + 1), VEXPORT);
13233 if (!lookupvar("HOSTNAME")) {
13234 struct utsname uts;
13236 setvar0("HOSTNAME", uts.nodename);
13239 p = lookupvar("PWD");
13241 if (p[0] != '/' || stat(p, &st1) || stat(".", &st2)
13242 || st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino
13252 //usage:#define ash_trivial_usage
13253 //usage: "[-/+OPTIONS] [-/+o OPT]... [-c 'SCRIPT' [ARG0 [ARGS]] / FILE [ARGS]]"
13254 //usage:#define ash_full_usage "\n\n"
13255 //usage: "Unix shell interpreter"
13257 //usage:#if ENABLE_FEATURE_SH_IS_ASH
13258 //usage:# define sh_trivial_usage ash_trivial_usage
13259 //usage:# define sh_full_usage ash_full_usage
13261 //usage:#if ENABLE_FEATURE_BASH_IS_ASH
13262 //usage:# define bash_trivial_usage ash_trivial_usage
13263 //usage:# define bash_full_usage ash_full_usage
13267 * Process the shell command line arguments.
13270 procargs(char **argv)
13273 const char *xminusc;
13278 /* if (xargv[0]) - mmm, this is always true! */
13280 for (i = 0; i < NOPTS; i++)
13283 if (options(/*cmdline:*/ 1)) {
13284 /* it already printed err message */
13285 raise_exception(EXERROR);
13289 if (*xargv == NULL) {
13291 ash_msg_and_raise_error(bb_msg_requires_arg, "-c");
13294 if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
13298 for (i = 0; i < NOPTS; i++)
13299 if (optlist[i] == 2)
13304 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
13309 } else if (!sflag) {
13310 setinputfile(*xargv, 0);
13313 commandname = arg0;
13316 shellparam.p = xargv;
13317 #if ENABLE_ASH_GETOPTS
13318 shellparam.optind = 1;
13319 shellparam.optoff = -1;
13321 /* assert(shellparam.malloced == 0 && shellparam.nparam == 0); */
13323 shellparam.nparam++;
13330 * Read /etc/profile or .profile.
13333 read_profile(const char *name)
13335 if (setinputfile(name, INPUT_PUSH_FILE | INPUT_NOFILE_OK) < 0)
13342 * This routine is called when an error or an interrupt occurs in an
13343 * interactive shell and control is returned to the main command loop.
13351 /* from input.c: */
13352 g_parsefile->left_in_buffer = 0;
13353 g_parsefile->left_in_line = 0; /* clear input buffer */
13355 /* from parser.c: */
13358 /* from redir.c: */
13359 clearredir(/*drop:*/ 0);
13363 static short profile_buf[16384];
13364 extern int etext();
13368 * Main routine. We initialize things, parse the arguments, execute
13369 * profiles if we're a login shell, and then call cmdloop to execute
13370 * commands. The setjmp call sets up the location to jump to when an
13371 * exception occurs. When an exception occurs the variable "state"
13372 * is used to figure out how far we had gotten.
13374 int ash_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
13375 int ash_main(int argc UNUSED_PARAM, char **argv)
13377 const char *shinit;
13378 volatile smallint state;
13379 struct jmploc jmploc;
13380 struct stackmark smark;
13382 /* Initialize global data */
13386 #if ENABLE_ASH_ALIAS
13392 monitor(4, etext, profile_buf, sizeof(profile_buf), 50);
13395 #if ENABLE_FEATURE_EDITING
13396 line_input_state = new_line_input_t(FOR_SHELL | WITH_PATH_LOOKUP);
13399 if (setjmp(jmploc.loc)) {
13405 e = exception_type;
13407 if (e == EXEXIT || s == 0 || iflag == 0 || shlvl) {
13411 newline_and_flush(stderr);
13414 popstackmark(&smark);
13415 FORCE_INT_ON; /* enable interrupts */
13424 exception_handler = &jmploc;
13427 TRACE(("Shell args: "));
13428 trace_puts_args(argv);
13430 rootpid = getpid();
13433 setstackmark(&smark);
13436 if (argv[0] && argv[0][0] == '-')
13442 read_profile("/etc/profile");
13445 hp = lookupvar("HOME");
13447 hp = concat_path_file(hp, ".profile");
13456 getuid() == geteuid() && getgid() == getegid() &&
13460 shinit = lookupvar("ENV");
13461 if (shinit != NULL && *shinit != '\0') {
13462 read_profile(shinit);
13468 /* evalstring pushes parsefile stack.
13469 * Ensure we don't falsely claim that 0 (stdin)
13470 * is one of stacked source fds.
13471 * Testcase: ash -c 'exec 1>&0' must not complain. */
13472 // if (!sflag) g_parsefile->pf_fd = -1;
13473 // ^^ not necessary since now we special-case fd 0
13474 // in is_hidden_fd() to not be considered "hidden fd"
13475 evalstring(minusc, 0);
13478 if (sflag || minusc == NULL) {
13479 #if MAX_HISTORY > 0 && ENABLE_FEATURE_EDITING_SAVEHISTORY
13481 const char *hp = lookupvar("HISTFILE");
13483 hp = lookupvar("HOME");
13485 hp = concat_path_file(hp, ".ash_history");
13486 setvar0("HISTFILE", hp);
13488 hp = lookupvar("HISTFILE");
13492 line_input_state->hist_file = hp;
13493 # if ENABLE_FEATURE_SH_HISTFILESIZE
13494 hp = lookupvar("HISTFILESIZE");
13495 line_input_state->max_history = size_from_HISTFILESIZE(hp);
13499 state4: /* XXX ??? - why isn't this before the "if" statement */
13507 extern void _mcleanup(void);
13511 TRACE(("End of main reached\n"));
13518 * Copyright (c) 1989, 1991, 1993, 1994
13519 * The Regents of the University of California. All rights reserved.
13521 * This code is derived from software contributed to Berkeley by
13522 * Kenneth Almquist.
13524 * Redistribution and use in source and binary forms, with or without
13525 * modification, are permitted provided that the following conditions
13527 * 1. Redistributions of source code must retain the above copyright
13528 * notice, this list of conditions and the following disclaimer.
13529 * 2. Redistributions in binary form must reproduce the above copyright
13530 * notice, this list of conditions and the following disclaimer in the
13531 * documentation and/or other materials provided with the distribution.
13532 * 3. Neither the name of the University nor the names of its contributors
13533 * may be used to endorse or promote products derived from this software
13534 * without specific prior written permission.
13536 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
13537 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
13538 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
13539 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
13540 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
13541 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
13542 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
13543 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
13544 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
13545 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF