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.
21 //config: depends on !NOMMU
23 //config: Tha 'ash' shell adds about 60k in the default configuration and is
24 //config: the most complete and most pedantically correct shell included with
25 //config: busybox. This shell is actually a derivative of the Debian 'dash'
26 //config: shell (by Herbert Xu), which was created by porting the 'ash' shell
27 //config: (written by Kenneth Almquist) from NetBSD.
29 //config:# ash options
30 //config:# note: Don't remove !NOMMU part in the next line; it would break
31 //config:# menuconfig's indenting.
32 //config:if !NOMMU && (ASH || SH_IS_ASH || BASH_IS_ASH)
34 //config:config ASH_OPTIMIZE_FOR_SIZE
35 //config: bool "Optimize for size instead of speed"
37 //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
39 //config:config ASH_INTERNAL_GLOB
40 //config: bool "Use internal glob() implementation"
41 //config: default y # Y is bigger, but because of uclibc glob() bug, let Y be default for now
42 //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
44 //config: Do not use glob() function from libc, use internal implementation.
45 //config: Use this if you are getting "glob.h: No such file or directory"
46 //config: or similar build errors.
47 //config: Note that as of now (2017-01), uclibc and musl glob() both have bugs
48 //config: which would break ash if you select N here.
50 //config:config ASH_BASH_COMPAT
51 //config: bool "bash-compatible extensions"
53 //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
55 //config:config ASH_JOB_CONTROL
56 //config: bool "Job control"
58 //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
60 //config:config ASH_ALIAS
61 //config: bool "Alias support"
63 //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
65 //config:config ASH_RANDOM_SUPPORT
66 //config: bool "Pseudorandom generator and $RANDOM variable"
68 //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
70 //config: Enable pseudorandom generator and dynamic variable "$RANDOM".
71 //config: Each read of "$RANDOM" will generate a new pseudorandom value.
72 //config: You can reset the generator by using a specified start value.
73 //config: After "unset RANDOM" the generator will switch off and this
74 //config: variable will no longer have special treatment.
76 //config:config ASH_EXPAND_PRMT
77 //config: bool "Expand prompt string"
79 //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
81 //config: $PS# may contain volatile content, such as backquote commands.
82 //config: This option recreates the prompt string from the environment
83 //config: variable each time it is displayed.
85 //config:config ASH_IDLE_TIMEOUT
86 //config: bool "Idle timeout variable $TMOUT"
88 //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
90 //config: Enable bash-like auto-logout after $TMOUT seconds of idle time.
92 //config:config ASH_MAIL
93 //config: bool "Check for new mail in interactive shell"
95 //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
97 //config: Enable "check for new mail" function:
98 //config: if set, $MAIL file and $MAILPATH list of files
99 //config: are checked for mtime changes, and "you have mail"
100 //config: message is printed if change is detected.
102 //config:config ASH_ECHO
103 //config: bool "echo builtin"
105 //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
107 //config:config ASH_PRINTF
108 //config: bool "printf builtin"
110 //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
112 //config:config ASH_TEST
113 //config: bool "test builtin"
115 //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
117 //config:config ASH_HELP
118 //config: bool "help builtin"
120 //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
122 //config:config ASH_GETOPTS
123 //config: bool "getopts builtin"
125 //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
127 //config:config ASH_CMDCMD
128 //config: bool "command builtin"
130 //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
132 //config: Enable support for the 'command' builtin, which allows
133 //config: you to run the specified command or builtin,
134 //config: even when there is a function with the same name.
136 //config:endif # ash options
138 //applet:IF_ASH(APPLET(ash, BB_DIR_BIN, BB_SUID_DROP))
139 // APPLET_ODDNAME:name main location suid_type help
140 //applet:IF_SH_IS_ASH( APPLET_ODDNAME(sh, ash, BB_DIR_BIN, BB_SUID_DROP, ash))
141 //applet:IF_BASH_IS_ASH(APPLET_ODDNAME(bash, ash, BB_DIR_BIN, BB_SUID_DROP, ash))
143 //kbuild:lib-$(CONFIG_ASH) += ash.o ash_ptr_hack.o shell_common.o
144 //kbuild:lib-$(CONFIG_SH_IS_ASH) += ash.o ash_ptr_hack.o shell_common.o
145 //kbuild:lib-$(CONFIG_BASH_IS_ASH) += ash.o ash_ptr_hack.o shell_common.o
146 //kbuild:lib-$(CONFIG_ASH_RANDOM_SUPPORT) += random.o
149 * DEBUG=1 to compile in debugging ('set -o debug' turns on)
150 * DEBUG=2 to compile in and turn on debugging.
151 * When debugging is on ("set -o debug" was executed, or DEBUG=2),
152 * debugging info is written to ./trace, quit signal generates core dump.
155 /* Tweak debug output verbosity here */
159 #define DEBUG_INTONOFF 0
163 #define JOBS ENABLE_ASH_JOB_CONTROL
167 #include <sys/times.h>
168 #include <sys/utsname.h> /* for setting $HOSTNAME */
169 #include "busybox.h" /* for applet_names */
171 /* So far, all bash compat is controlled by one config option */
172 /* Separate defines document which part of code implements what */
173 /* function keyword */
174 #define BASH_FUNCTION ENABLE_ASH_BASH_COMPAT
175 #define IF_BASH_FUNCTION IF_ASH_BASH_COMPAT
177 #define BASH_REDIR_OUTPUT ENABLE_ASH_BASH_COMPAT
178 #define IF_BASH_REDIR_OUTPUT IF_ASH_BASH_COMPAT
180 #define BASH_DOLLAR_SQUOTE ENABLE_ASH_BASH_COMPAT
181 #define IF_BASH_DOLLAR_SQUOTE IF_ASH_BASH_COMPAT
182 #define BASH_PATTERN_SUBST ENABLE_ASH_BASH_COMPAT
183 #define IF_BASH_PATTERN_SUBST IF_ASH_BASH_COMPAT
184 #define BASH_SUBSTR ENABLE_ASH_BASH_COMPAT
185 #define IF_BASH_SUBSTR IF_ASH_BASH_COMPAT
187 #define BASH_TEST2 (ENABLE_ASH_BASH_COMPAT * ENABLE_ASH_TEST)
188 #define BASH_SOURCE ENABLE_ASH_BASH_COMPAT
189 #define BASH_PIPEFAIL ENABLE_ASH_BASH_COMPAT
190 #define BASH_HOSTNAME_VAR ENABLE_ASH_BASH_COMPAT
191 #define BASH_SHLVL_VAR ENABLE_ASH_BASH_COMPAT
193 #if defined(__ANDROID_API__) && __ANDROID_API__ <= 24
194 /* Bionic at least up to version 24 has no glob() */
195 # undef ENABLE_ASH_INTERNAL_GLOB
196 # define ENABLE_ASH_INTERNAL_GLOB 1
199 #if !ENABLE_ASH_INTERNAL_GLOB && defined(__UCLIBC__)
200 # error uClibc glob() is buggy, use ASH_INTERNAL_GLOB.
201 # error The bug is: for "$PWD"/<pattern> ash will escape e.g. dashes in "$PWD"
202 # error with backslash, even ones which do not need to be: "/a-b" -> "/a\-b"
203 # error glob() should unbackslash them and match. uClibc does not unbackslash,
204 # error fails to match dirname, subsequently not expanding <pattern> in it.
206 // if (glob("/etc/polkit\\-1", 0, NULL, &pglob)) - this returns 0 on uclibc, no bug
207 // if (glob("/etc/polkit\\-1/*", 0, NULL, &pglob)) printf("uclibc bug!\n");
210 #if !ENABLE_ASH_INTERNAL_GLOB
215 #include "shell_common.h"
216 #if ENABLE_FEATURE_SH_MATH
219 #if ENABLE_ASH_RANDOM_SUPPORT
222 # define CLEAR_RANDOM_T(rnd) ((void)0)
225 #include "NUM_APPLETS.h"
227 /* STANDALONE does not make sense, and won't compile */
228 # undef CONFIG_FEATURE_SH_STANDALONE
229 # undef ENABLE_FEATURE_SH_STANDALONE
230 # undef IF_FEATURE_SH_STANDALONE
231 # undef IF_NOT_FEATURE_SH_STANDALONE
232 # define ENABLE_FEATURE_SH_STANDALONE 0
233 # define IF_FEATURE_SH_STANDALONE(...)
234 # define IF_NOT_FEATURE_SH_STANDALONE(...) __VA_ARGS__
238 # define PIPE_BUF 4096 /* amount of buffering in a pipe */
242 # error "Do not even bother, ash will not run on NOMMU machine"
246 /* ============ Hash table sizes. Configurable. */
250 #define CMDTABLESIZE 31 /* should be prime */
253 /* ============ Shell options */
255 static const char *const optletters_optnames[] = {
279 #define optletters(n) optletters_optnames[n][0]
280 #define optnames(n) (optletters_optnames[n] + 1)
282 enum { NOPTS = ARRAY_SIZE(optletters_optnames) };
285 /* ============ Misc data */
287 #define msg_illnum "Illegal number: %s"
290 * We enclose jmp_buf in a structure so that we can declare pointers to
291 * jump locations. The global variable handler contains the location to
292 * jump to when an exception occurs, and the global variable exception_type
293 * contains a code identifying the exception. To implement nested
294 * exception handlers, the user should save the value of handler on entry
295 * to an inner scope, set handler to point to a jmploc structure for the
296 * inner scope, and restore handler on exit from the scope.
302 struct globals_misc {
303 uint8_t exitstatus; /* exit status of last command */
304 uint8_t back_exitstatus;/* exit status of backquoted command */
305 smallint job_warning; /* user was warned about stopped jobs (can be 2, 1 or 0). */
306 int rootpid; /* pid of main shell */
307 /* shell level: 0 for the main shell, 1 for its children, and so on */
309 #define rootshell (!shlvl)
310 char *minusc; /* argument to -c option */
312 char *curdir; // = nullstr; /* current working directory */
313 char *physdir; // = nullstr; /* physical working directory */
315 char *arg0; /* value of $0 */
317 struct jmploc *exception_handler;
319 volatile int suppress_int; /* counter */
320 volatile /*sig_atomic_t*/ smallint pending_int; /* 1 = got SIGINT */
321 volatile /*sig_atomic_t*/ smallint got_sigchld; /* 1 = got SIGCHLD */
322 volatile /*sig_atomic_t*/ smallint pending_sig; /* last pending signal */
323 smallint exception_type; /* kind of exception (0..5) */
325 #define EXINT 0 /* SIGINT received */
326 #define EXERROR 1 /* a generic error */
327 #define EXEXIT 4 /* exit the shell */
330 char nullstr[1]; /* zero length string */
333 #define eflag optlist[0]
334 #define fflag optlist[1]
335 #define Iflag optlist[2]
336 #define iflag optlist[3]
337 #define mflag optlist[4]
338 #define nflag optlist[5]
339 #define sflag optlist[6]
340 #define xflag optlist[7]
341 #define vflag optlist[8]
342 #define Cflag optlist[9]
343 #define aflag optlist[10]
344 #define bflag optlist[11]
345 #define uflag optlist[12]
346 #define viflag optlist[13]
348 # define pipefail optlist[14]
353 # define nolog optlist[14 + BASH_PIPEFAIL]
354 # define debug optlist[15 + BASH_PIPEFAIL]
357 /* trap handler commands */
359 * Sigmode records the current value of the signal handlers for the various
360 * modes. A value of zero means that the current handler is not known.
361 * S_HARD_IGN indicates that the signal was ignored on entry to the shell.
363 char sigmode[NSIG - 1];
364 #define S_DFL 1 /* default signal handling (SIG_DFL) */
365 #define S_CATCH 2 /* signal is caught */
366 #define S_IGN 3 /* signal is ignored (SIG_IGN) */
367 #define S_HARD_IGN 4 /* signal is ignored permanently */
369 /* indicates specified signal received */
370 uint8_t gotsig[NSIG - 1]; /* offset by 1: "signal" 0 is meaningless */
371 uint8_t may_have_traps; /* 0: definitely no traps are set, 1: some traps may be set */
373 char **trap_ptr; /* used only by "trap hack" */
375 /* Rarely referenced stuff */
376 #if ENABLE_ASH_RANDOM_SUPPORT
379 pid_t backgndpid; /* pid of last background process */
381 extern struct globals_misc *const ash_ptr_to_globals_misc;
382 #define G_misc (*ash_ptr_to_globals_misc)
383 #define exitstatus (G_misc.exitstatus )
384 #define back_exitstatus (G_misc.back_exitstatus )
385 #define job_warning (G_misc.job_warning)
386 #define rootpid (G_misc.rootpid )
387 #define shlvl (G_misc.shlvl )
388 #define minusc (G_misc.minusc )
389 #define curdir (G_misc.curdir )
390 #define physdir (G_misc.physdir )
391 #define arg0 (G_misc.arg0 )
392 #define exception_handler (G_misc.exception_handler)
393 #define exception_type (G_misc.exception_type )
394 #define suppress_int (G_misc.suppress_int )
395 #define pending_int (G_misc.pending_int )
396 #define got_sigchld (G_misc.got_sigchld )
397 #define pending_sig (G_misc.pending_sig )
398 #define isloginsh (G_misc.isloginsh )
399 #define nullstr (G_misc.nullstr )
400 #define optlist (G_misc.optlist )
401 #define sigmode (G_misc.sigmode )
402 #define gotsig (G_misc.gotsig )
403 #define may_have_traps (G_misc.may_have_traps )
404 #define trap (G_misc.trap )
405 #define trap_ptr (G_misc.trap_ptr )
406 #define random_gen (G_misc.random_gen )
407 #define backgndpid (G_misc.backgndpid )
408 #define INIT_G_misc() do { \
409 (*(struct globals_misc**)&ash_ptr_to_globals_misc) = xzalloc(sizeof(G_misc)); \
417 /* ============ DEBUG */
419 static void trace_printf(const char *fmt, ...);
420 static void trace_vprintf(const char *fmt, va_list va);
421 # define TRACE(param) trace_printf param
422 # define TRACEV(param) trace_vprintf param
423 # define close(fd) do { \
425 if (close(dfd) < 0) \
426 bb_error_msg("bug on %d: closing %d(0x%x)", \
427 __LINE__, dfd, dfd); \
430 # define TRACE(param)
431 # define TRACEV(param)
435 /* ============ Utility functions */
436 #define is_name(c) ((c) == '_' || isalpha((unsigned char)(c)))
437 #define is_in_name(c) ((c) == '_' || isalnum((unsigned char)(c)))
440 isdigit_str9(const char *str)
442 int maxlen = 9 + 1; /* max 9 digits: 999999999 */
443 while (--maxlen && isdigit(*str))
445 return (*str == '\0');
449 var_end(const char *var)
458 /* ============ Interrupts / exceptions */
460 static void exitshell(void) NORETURN;
463 * These macros allow the user to suspend the handling of interrupt signals
464 * over a period of time. This is similar to SIGHOLD or to sigblock, but
465 * much more efficient and portable. (But hacking the kernel is so much
466 * more fun than worrying about efficiency and portability. :-))
469 # define INT_OFF do { \
470 TRACE(("%s:%d INT_OFF(%d)\n", __func__, __LINE__, suppress_int)); \
475 # define INT_OFF do { \
482 * Called to raise an exception. Since C doesn't include exceptions, we
483 * just do a longjmp to the exception handler. The type of exception is
484 * stored in the global variable "exception_type".
486 static void raise_exception(int) NORETURN;
488 raise_exception(int e)
491 if (exception_handler == NULL)
496 longjmp(exception_handler->loc, 1);
499 #define raise_exception(e) do { \
500 TRACE(("raising exception %d on line %d\n", (e), __LINE__)); \
501 raise_exception(e); \
506 * Called when a SIGINT is received. (If the user specifies
507 * that SIGINT is to be trapped or ignored using the trap builtin, then
508 * this routine is not called.) Suppressint is nonzero when interrupts
509 * are held using the INT_OFF macro. (The test for iflag is just
510 * defensive programming.)
512 static void raise_interrupt(void) NORETURN;
514 raise_interrupt(void)
517 /* Signal is not automatically unmasked after it is raised,
518 * do it ourself - unmask all signals */
519 sigprocmask_allsigs(SIG_UNBLOCK);
520 /* pending_sig = 0; - now done in signal_handler() */
522 if (!(rootshell && iflag)) {
523 /* Kill ourself with SIGINT */
524 signal(SIGINT, SIG_DFL);
527 /* bash: ^C even on empty command line sets $? */
528 exitstatus = SIGINT + 128;
529 raise_exception(EXINT);
533 #define raise_interrupt() do { \
534 TRACE(("raising interrupt on line %d\n", __LINE__)); \
539 static IF_ASH_OPTIMIZE_FOR_SIZE(inline) void
543 if (--suppress_int == 0 && pending_int) {
548 # define INT_ON do { \
549 TRACE(("%s:%d INT_ON(%d)\n", __func__, __LINE__, suppress_int-1)); \
553 # define INT_ON int_on()
555 static IF_ASH_OPTIMIZE_FOR_SIZE(inline) void
563 #define FORCE_INT_ON force_int_on()
565 #define SAVE_INT(v) ((v) = suppress_int)
567 #define RESTORE_INT(v) do { \
569 suppress_int = (v); \
570 if (suppress_int == 0 && pending_int) \
575 /* ============ Stdout/stderr output */
578 outstr(const char *p, FILE *file)
586 flush_stdout_stderr(void)
593 /* Was called outcslow(c,FILE*), but c was always '\n' */
595 newline_and_flush(FILE *dest)
603 static int out1fmt(const char *, ...) __attribute__((__format__(__printf__,1,2)));
605 out1fmt(const char *fmt, ...)
612 r = vprintf(fmt, ap);
618 static int fmtstr(char *, size_t, const char *, ...) __attribute__((__format__(__printf__,3,4)));
620 fmtstr(char *outbuf, size_t length, const char *fmt, ...)
627 ret = vsnprintf(outbuf, length, fmt, ap);
634 out1str(const char *p)
640 out2str(const char *p)
643 flush_stdout_stderr();
647 /* ============ Parser structures */
649 /* control characters in argument strings */
650 #define CTL_FIRST CTLESC
651 #define CTLESC ((unsigned char)'\201') /* escape next character */
652 #define CTLVAR ((unsigned char)'\202') /* variable defn */
653 #define CTLENDVAR ((unsigned char)'\203')
654 #define CTLBACKQ ((unsigned char)'\204')
655 #define CTLARI ((unsigned char)'\206') /* arithmetic expression */
656 #define CTLENDARI ((unsigned char)'\207')
657 #define CTLQUOTEMARK ((unsigned char)'\210')
658 #define CTL_LAST CTLQUOTEMARK
660 /* variable substitution byte (follows CTLVAR) */
661 #define VSTYPE 0x0f /* type of variable substitution */
662 #define VSNUL 0x10 /* colon--treat the empty string as unset */
664 /* values of VSTYPE field */
665 #define VSNORMAL 0x1 /* normal variable: $var or ${var} */
666 #define VSMINUS 0x2 /* ${var-text} */
667 #define VSPLUS 0x3 /* ${var+text} */
668 #define VSQUESTION 0x4 /* ${var?message} */
669 #define VSASSIGN 0x5 /* ${var=text} */
670 #define VSTRIMRIGHT 0x6 /* ${var%pattern} */
671 #define VSTRIMRIGHTMAX 0x7 /* ${var%%pattern} */
672 #define VSTRIMLEFT 0x8 /* ${var#pattern} */
673 #define VSTRIMLEFTMAX 0x9 /* ${var##pattern} */
674 #define VSLENGTH 0xa /* ${#var} */
676 #define VSSUBSTR 0xc /* ${var:position:length} */
678 #if BASH_PATTERN_SUBST
679 #define VSREPLACE 0xd /* ${var/pattern/replacement} */
680 #define VSREPLACEALL 0xe /* ${var//pattern/replacement} */
683 static const char dolatstr[] ALIGN1 = {
684 CTLQUOTEMARK, CTLVAR, VSNORMAL, '@', '=', CTLQUOTEMARK, '\0'
686 #define DOLATSTRLEN 6
705 #if BASH_REDIR_OUTPUT
722 smallint type; /* Nxxxx */
725 union node *redirect;
730 smallint pipe_backgnd;
731 struct nodelist *cmdlist;
737 union node *redirect;
750 union node *elsepart;
777 struct nodelist *backquote;
780 /* nfile and ndup layout must match!
781 * NTOFD (>&fdnum) uses ndup structure, but we may discover mid-flight
782 * that it is actually NTO2 (>&file), and change its type.
799 char *_unused_expfname;
818 struct nredir nredir;
819 struct nbinary nbinary;
823 struct nclist nclist;
832 * NODE_EOF is returned by parsecmd when it encounters an end of file.
833 * It must be distinct from NULL.
835 #define NODE_EOF ((union node *) -1L)
838 struct nodelist *next;
851 freefunc(struct funcnode *f)
853 if (f && --f->count < 0)
858 /* ============ Debugging output */
862 static FILE *tracefile;
865 trace_printf(const char *fmt, ...)
872 fprintf(tracefile, "%u ", (int) time(NULL));
874 fprintf(tracefile, "[%u] ", (int) getpid());
876 fprintf(tracefile, "pending s:%d i:%d(supp:%d) ", pending_sig, pending_int, suppress_int);
878 vfprintf(tracefile, fmt, va);
883 trace_vprintf(const char *fmt, va_list va)
887 vfprintf(tracefile, fmt, va);
888 fprintf(tracefile, "\n");
892 trace_puts(const char *s)
900 trace_puts_quoted(char *s)
907 putc('"', tracefile);
908 for (p = s; *p; p++) {
909 switch ((unsigned char)*p) {
910 case '\n': c = 'n'; goto backslash;
911 case '\t': c = 't'; goto backslash;
912 case '\r': c = 'r'; goto backslash;
913 case '\"': c = '\"'; goto backslash;
914 case '\\': c = '\\'; goto backslash;
915 case CTLESC: c = 'e'; goto backslash;
916 case CTLVAR: c = 'v'; goto backslash;
917 case CTLBACKQ: c = 'q'; goto backslash;
919 putc('\\', tracefile);
923 if (*p >= ' ' && *p <= '~')
926 putc('\\', tracefile);
927 putc((*p >> 6) & 03, tracefile);
928 putc((*p >> 3) & 07, tracefile);
929 putc(*p & 07, tracefile);
934 putc('"', tracefile);
938 trace_puts_args(char **ap)
945 trace_puts_quoted(*ap);
947 putc('\n', tracefile);
950 putc(' ', tracefile);
965 /* leave open because libedit might be using it */
968 strcpy(s, "./trace");
970 if (!freopen(s, "a", tracefile)) {
971 fprintf(stderr, "Can't re-open %s\n", s);
976 tracefile = fopen(s, "a");
977 if (tracefile == NULL) {
978 fprintf(stderr, "Can't open %s\n", s);
984 flags = fcntl(fileno(tracefile), F_GETFL);
986 fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND);
988 setlinebuf(tracefile);
989 fputs("\nTracing started.\n", tracefile);
993 indent(int amount, char *pfx, FILE *fp)
997 for (i = 0; i < amount; i++) {
998 if (pfx && i == amount - 1)
1004 /* little circular references here... */
1005 static void shtree(union node *n, int ind, char *pfx, FILE *fp);
1008 sharg(union node *arg, FILE *fp)
1011 struct nodelist *bqlist;
1012 unsigned char subtype;
1014 if (arg->type != NARG) {
1015 out1fmt("<node type %d>\n", arg->type);
1018 bqlist = arg->narg.backquote;
1019 for (p = arg->narg.text; *p; p++) {
1020 switch ((unsigned char)*p) {
1029 if (subtype == VSLENGTH)
1037 if (subtype & VSNUL)
1040 switch (subtype & VSTYPE) {
1066 case VSTRIMRIGHTMAX:
1073 out1fmt("<subtype %d>", subtype);
1082 shtree(bqlist->n, -1, NULL, fp);
1093 shcmd(union node *cmd, FILE *fp)
1101 for (np = cmd->ncmd.args; np; np = np->narg.next) {
1107 for (np = cmd->ncmd.redirect; np; np = np->nfile.next) {
1111 switch (np->nfile.type) {
1112 case NTO: s = ">>"+1; dftfd = 1; break;
1113 case NCLOBBER: s = ">|"; dftfd = 1; break;
1114 case NAPPEND: s = ">>"; dftfd = 1; break;
1115 #if BASH_REDIR_OUTPUT
1118 case NTOFD: s = ">&"; dftfd = 1; break;
1119 case NFROM: s = "<"; break;
1120 case NFROMFD: s = "<&"; break;
1121 case NFROMTO: s = "<>"; break;
1122 default: s = "*error*"; break;
1124 if (np->nfile.fd != dftfd)
1125 fprintf(fp, "%d", np->nfile.fd);
1127 if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) {
1128 fprintf(fp, "%d", np->ndup.dupfd);
1130 sharg(np->nfile.fname, fp);
1137 shtree(union node *n, int ind, char *pfx, FILE *fp)
1139 struct nodelist *lp;
1145 indent(ind, pfx, fp);
1147 if (n == NODE_EOF) {
1162 shtree(n->nbinary.ch1, ind, NULL, fp);
1165 shtree(n->nbinary.ch2, ind, NULL, fp);
1173 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
1174 shtree(lp->n, 0, NULL, fp);
1178 if (n->npipe.pipe_backgnd)
1184 fprintf(fp, "<node type %d>", n->type);
1192 showtree(union node *n)
1194 trace_puts("showtree called\n");
1195 shtree(n, 1, NULL, stderr);
1201 /* ============ Parser data */
1204 * ash_vmsg() needs parsefile->fd, hence parsefile definition is moved up.
1207 struct strlist *next;
1214 struct strpush *prev; /* preceding string on stack */
1216 int prev_left_in_line;
1217 #if ENABLE_ASH_ALIAS
1218 struct alias *ap; /* if push was associated with an alias */
1220 char *string; /* remember the string since it may change */
1222 /* Remember last two characters for pungetc. */
1225 /* Number of outstanding calls to pungetc. */
1230 struct parsefile *prev; /* preceding file on stack */
1231 int linno; /* current line */
1232 int pf_fd; /* file descriptor (or -1 if string) */
1233 int left_in_line; /* number of chars left in this line */
1234 int left_in_buffer; /* number of chars left in this buffer past the line */
1235 char *next_to_pgetc; /* next char in buffer */
1236 char *buf; /* input buffer */
1237 struct strpush *strpush; /* for pushing strings at this level */
1238 struct strpush basestrpush; /* so pushing one is fast */
1240 /* Remember last two characters for pungetc. */
1243 /* Number of outstanding calls to pungetc. */
1247 static struct parsefile basepf; /* top level input file */
1248 static struct parsefile *g_parsefile = &basepf; /* current input file */
1249 static int startlinno; /* line # where last token started */
1250 static char *commandname; /* currently executing command */
1251 static struct strlist *cmdenviron; /* environment for builtin command */
1254 /* ============ Message printing */
1257 ash_vmsg(const char *msg, va_list ap)
1259 fprintf(stderr, "%s: ", arg0);
1261 if (strcmp(arg0, commandname))
1262 fprintf(stderr, "%s: ", commandname);
1263 if (!iflag || g_parsefile->pf_fd > 0)
1264 fprintf(stderr, "line %d: ", startlinno);
1266 vfprintf(stderr, msg, ap);
1267 newline_and_flush(stderr);
1271 * Exverror is called to raise the error exception. If the second argument
1272 * is not NULL then error prints an error message using printf style
1273 * formatting. It then raises the error exception.
1275 static void ash_vmsg_and_raise(int, const char *, va_list) NORETURN;
1277 ash_vmsg_and_raise(int cond, const char *msg, va_list ap)
1281 TRACE(("ash_vmsg_and_raise(%d):", cond));
1284 TRACE(("ash_vmsg_and_raise(%d):NULL\n", cond));
1289 flush_stdout_stderr();
1290 raise_exception(cond);
1294 static void ash_msg_and_raise_error(const char *, ...) NORETURN;
1296 ash_msg_and_raise_error(const char *msg, ...)
1303 ash_vmsg_and_raise(EXERROR, msg, ap);
1308 static void raise_error_syntax(const char *) NORETURN;
1310 raise_error_syntax(const char *msg)
1312 ash_msg_and_raise_error("syntax error: %s", msg);
1316 static void ash_msg_and_raise(int, const char *, ...) NORETURN;
1318 ash_msg_and_raise(int cond, const char *msg, ...)
1323 ash_vmsg_and_raise(cond, msg, ap);
1329 * error/warning routines for external builtins
1332 ash_msg(const char *fmt, ...)
1342 * Return a string describing an error. The returned string may be a
1343 * pointer to a static buffer that will be overwritten on the next call.
1344 * Action describes the operation that got the error.
1347 errmsg(int e, const char *em)
1349 if (e == ENOENT || e == ENOTDIR) {
1356 /* ============ Memory allocation */
1359 /* I consider these wrappers nearly useless:
1360 * ok, they return you to nearest exception handler, but
1361 * how much memory do you leak in the process, making
1362 * memory starvation worse?
1365 ckrealloc(void * p, size_t nbytes)
1367 p = realloc(p, nbytes);
1369 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1374 ckmalloc(size_t nbytes)
1376 return ckrealloc(NULL, nbytes);
1380 ckzalloc(size_t nbytes)
1382 return memset(ckmalloc(nbytes), 0, nbytes);
1386 ckstrdup(const char *s)
1388 char *p = strdup(s);
1390 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1394 /* Using bbox equivalents. They exit if out of memory */
1395 # define ckrealloc xrealloc
1396 # define ckmalloc xmalloc
1397 # define ckzalloc xzalloc
1398 # define ckstrdup xstrdup
1402 * It appears that grabstackstr() will barf with such alignments
1403 * because stalloc() will return a string allocated in a new stackblock.
1405 #define SHELL_ALIGN(nbytes) (((nbytes) + SHELL_SIZE) & ~SHELL_SIZE)
1407 /* Most machines require the value returned from malloc to be aligned
1408 * in some way. The following macro will get this right
1409 * on many machines. */
1410 SHELL_SIZE = sizeof(union { int i; char *cp; double d; }) - 1,
1411 /* Minimum size of a block */
1412 MINSIZE = SHELL_ALIGN(504),
1415 struct stack_block {
1416 struct stack_block *prev;
1417 char space[MINSIZE];
1421 struct stack_block *stackp;
1427 struct globals_memstack {
1428 struct stack_block *g_stackp; // = &stackbase;
1429 char *g_stacknxt; // = stackbase.space;
1430 char *sstrend; // = stackbase.space + MINSIZE;
1431 size_t g_stacknleft; // = MINSIZE;
1432 struct stack_block stackbase;
1434 extern struct globals_memstack *const ash_ptr_to_globals_memstack;
1435 #define G_memstack (*ash_ptr_to_globals_memstack)
1436 #define g_stackp (G_memstack.g_stackp )
1437 #define g_stacknxt (G_memstack.g_stacknxt )
1438 #define sstrend (G_memstack.sstrend )
1439 #define g_stacknleft (G_memstack.g_stacknleft)
1440 #define stackbase (G_memstack.stackbase )
1441 #define INIT_G_memstack() do { \
1442 (*(struct globals_memstack**)&ash_ptr_to_globals_memstack) = xzalloc(sizeof(G_memstack)); \
1444 g_stackp = &stackbase; \
1445 g_stacknxt = stackbase.space; \
1446 g_stacknleft = MINSIZE; \
1447 sstrend = stackbase.space + MINSIZE; \
1451 #define stackblock() ((void *)g_stacknxt)
1452 #define stackblocksize() g_stacknleft
1455 * Parse trees for commands are allocated in lifo order, so we use a stack
1456 * to make this more efficient, and also to avoid all sorts of exception
1457 * handling code to handle interrupts in the middle of a parse.
1459 * The size 504 was chosen because the Ultrix malloc handles that size
1463 stalloc(size_t nbytes)
1468 aligned = SHELL_ALIGN(nbytes);
1469 if (aligned > g_stacknleft) {
1472 struct stack_block *sp;
1474 blocksize = aligned;
1475 if (blocksize < MINSIZE)
1476 blocksize = MINSIZE;
1477 len = sizeof(struct stack_block) - MINSIZE + blocksize;
1478 if (len < blocksize)
1479 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1482 sp->prev = g_stackp;
1483 g_stacknxt = sp->space;
1484 g_stacknleft = blocksize;
1485 sstrend = g_stacknxt + blocksize;
1490 g_stacknxt += aligned;
1491 g_stacknleft -= aligned;
1496 stzalloc(size_t nbytes)
1498 return memset(stalloc(nbytes), 0, nbytes);
1505 if (!p || (g_stacknxt < (char *)p) || ((char *)p < g_stackp->space)) {
1506 write(STDERR_FILENO, "stunalloc\n", 10);
1510 g_stacknleft += g_stacknxt - (char *)p;
1515 * Like strdup but works with the ash stack.
1518 sstrdup(const char *p)
1520 size_t len = strlen(p) + 1;
1521 return memcpy(stalloc(len), p, len);
1525 grabstackblock(size_t len)
1531 pushstackmark(struct stackmark *mark, size_t len)
1533 mark->stackp = g_stackp;
1534 mark->stacknxt = g_stacknxt;
1535 mark->stacknleft = g_stacknleft;
1536 grabstackblock(len);
1540 setstackmark(struct stackmark *mark)
1542 pushstackmark(mark, g_stacknxt == g_stackp->space && g_stackp != &stackbase);
1546 popstackmark(struct stackmark *mark)
1548 struct stack_block *sp;
1554 while (g_stackp != mark->stackp) {
1556 g_stackp = sp->prev;
1559 g_stacknxt = mark->stacknxt;
1560 g_stacknleft = mark->stacknleft;
1561 sstrend = mark->stacknxt + mark->stacknleft;
1566 * When the parser reads in a string, it wants to stick the string on the
1567 * stack and only adjust the stack pointer when it knows how big the
1568 * string is. Stackblock (defined in stack.h) returns a pointer to a block
1569 * of space on top of the stack and stackblocklen returns the length of
1570 * this block. Growstackblock will grow this space by at least one byte,
1571 * possibly moving it (like realloc). Grabstackblock actually allocates the
1572 * part of the block that has been used.
1575 growstackblock(void)
1579 newlen = g_stacknleft * 2;
1580 if (newlen < g_stacknleft)
1581 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1585 if (g_stacknxt == g_stackp->space && g_stackp != &stackbase) {
1586 struct stack_block *sp;
1587 struct stack_block *prevstackp;
1592 prevstackp = sp->prev;
1593 grosslen = newlen + sizeof(struct stack_block) - MINSIZE;
1594 sp = ckrealloc(sp, grosslen);
1595 sp->prev = prevstackp;
1597 g_stacknxt = sp->space;
1598 g_stacknleft = newlen;
1599 sstrend = sp->space + newlen;
1602 char *oldspace = g_stacknxt;
1603 size_t oldlen = g_stacknleft;
1604 char *p = stalloc(newlen);
1606 /* free the space we just allocated */
1607 g_stacknxt = memcpy(p, oldspace, oldlen);
1608 g_stacknleft += newlen;
1613 * The following routines are somewhat easier to use than the above.
1614 * The user declares a variable of type STACKSTR, which may be declared
1615 * to be a register. The macro STARTSTACKSTR initializes things. Then
1616 * the user uses the macro STPUTC to add characters to the string. In
1617 * effect, STPUTC(c, p) is the same as *p++ = c except that the stack is
1618 * grown as necessary. When the user is done, she can just leave the
1619 * string there and refer to it using stackblock(). Or she can allocate
1620 * the space for it using grabstackstr(). If it is necessary to allow
1621 * someone else to use the stack temporarily and then continue to grow
1622 * the string, the user should use grabstack to allocate the space, and
1623 * then call ungrabstr(p) to return to the previous mode of operation.
1625 * USTPUTC is like STPUTC except that it doesn't check for overflow.
1626 * CHECKSTACKSPACE can be called before USTPUTC to ensure that there
1627 * is space for at least one character.
1632 size_t len = stackblocksize();
1634 return (char *)stackblock() + len;
1638 * Called from CHECKSTRSPACE.
1641 makestrspace(size_t newlen, char *p)
1643 size_t len = p - g_stacknxt;
1649 size = stackblocksize();
1651 if (nleft >= newlen)
1655 return (char *)stackblock() + len;
1659 stack_nputstr(const char *s, size_t n, char *p)
1661 p = makestrspace(n, p);
1662 p = (char *)memcpy(p, s, n) + n;
1667 stack_putstr(const char *s, char *p)
1669 return stack_nputstr(s, strlen(s), p);
1673 _STPUTC(int c, char *p)
1681 #define STARTSTACKSTR(p) ((p) = stackblock())
1682 #define STPUTC(c, p) ((p) = _STPUTC((c), (p)))
1683 #define CHECKSTRSPACE(n, p) do { \
1686 size_t m = sstrend - q; \
1688 (p) = makestrspace(l, q); \
1690 #define USTPUTC(c, p) (*(p)++ = (c))
1691 #define STACKSTRNUL(p) do { \
1692 if ((p) == sstrend) \
1693 (p) = growstackstr(); \
1696 #define STUNPUTC(p) (--(p))
1697 #define STTOPC(p) ((p)[-1])
1698 #define STADJUST(amount, p) ((p) += (amount))
1700 #define grabstackstr(p) stalloc((char *)(p) - (char *)stackblock())
1701 #define ungrabstackstr(s, p) stunalloc(s)
1702 #define stackstrend() ((void *)sstrend)
1705 /* ============ String helpers */
1708 * prefix -- see if pfx is a prefix of string.
1711 prefix(const char *string, const char *pfx)
1714 if (*pfx++ != *string++)
1717 return (char *) string;
1721 * Check for a valid number. This should be elsewhere.
1724 is_number(const char *p)
1729 } while (*++p != '\0');
1734 * Convert a string of digits to an integer, printing an error message on
1738 number(const char *s)
1741 ash_msg_and_raise_error(msg_illnum, s);
1746 * Produce a possibly single quoted string suitable as input to the shell.
1747 * The return string is allocated on the stack.
1750 single_quote(const char *s)
1760 len = strchrnul(s, '\'') - s;
1762 q = p = makestrspace(len + 3, p);
1765 q = (char *)memcpy(q, s, len) + len;
1774 do len++; while (*++s == '\'');
1776 q = p = makestrspace(len + 3, p);
1779 q = (char *)memcpy(q, s - len, len) + len;
1787 return stackblock();
1791 /* ============ nextopt */
1793 static char **argptr; /* argument list for builtin commands */
1794 static char *optionarg; /* set by nextopt (like getopt) */
1795 static char *optptr; /* used by nextopt */
1798 * XXX - should get rid of. Have all builtins use getopt(3).
1799 * The library getopt must have the BSD extension static variable
1800 * "optreset", otherwise it can't be used within the shell safely.
1802 * Standard option processing (a la getopt) for builtin routines.
1803 * The only argument that is passed to nextopt is the option string;
1804 * the other arguments are unnecessary. It returns the character,
1805 * or '\0' on end of input.
1808 nextopt(const char *optstring)
1815 if (p == NULL || *p == '\0') {
1816 /* We ate entire "-param", take next one */
1822 if (*++p == '\0') /* just "-" ? */
1825 if (LONE_DASH(p)) /* "--" ? */
1827 /* p => next "-param" */
1829 /* p => some option char in the middle of a "-param" */
1831 for (q = optstring; *q != c;) {
1833 ash_msg_and_raise_error("illegal option -%c", c);
1841 ash_msg_and_raise_error("no arg for -%c option", c);
1851 /* ============ Shell variables */
1854 * The parsefile structure pointed to by the global variable parsefile
1855 * contains information about the current file being read.
1858 int nparam; /* # of positional parameters (without $0) */
1859 #if ENABLE_ASH_GETOPTS
1860 int optind; /* next parameter to be processed by getopts */
1861 int optoff; /* used by getopts */
1863 unsigned char malloced; /* if parameter list dynamically allocated */
1864 char **p; /* parameter list */
1868 * Free the list of positional parameters.
1871 freeparam(volatile struct shparam *param)
1873 if (param->malloced) {
1875 ap = ap1 = param->p;
1882 #if ENABLE_ASH_GETOPTS
1883 static void FAST_FUNC getoptsreset(const char *value);
1887 struct var *next; /* next entry in hash list */
1888 int flags; /* flags are defined above */
1889 const char *var_text; /* name=value */
1890 void (*var_func)(const char *) FAST_FUNC; /* function to be called when */
1891 /* the variable gets set/unset */
1895 struct localvar *next; /* next local variable in list */
1896 struct var *vp; /* the variable that was made local */
1897 int flags; /* saved flags */
1898 const char *text; /* saved text */
1902 #define VEXPORT 0x01 /* variable is exported */
1903 #define VREADONLY 0x02 /* variable cannot be modified */
1904 #define VSTRFIXED 0x04 /* variable struct is statically allocated */
1905 #define VTEXTFIXED 0x08 /* text is statically allocated */
1906 #define VSTACK 0x10 /* text is allocated on the stack */
1907 #define VUNSET 0x20 /* the variable is not set */
1908 #define VNOFUNC 0x40 /* don't call the callback function */
1909 #define VNOSET 0x80 /* do not set variable - just readonly test */
1910 #define VNOSAVE 0x100 /* when text is on the heap before setvareq */
1911 #if ENABLE_ASH_RANDOM_SUPPORT
1912 # define VDYNAMIC 0x200 /* dynamic variable */
1918 /* Need to be before varinit_data[] */
1919 #if ENABLE_LOCALE_SUPPORT
1920 static void FAST_FUNC
1921 change_lc_all(const char *value)
1923 if (value && *value != '\0')
1924 setlocale(LC_ALL, value);
1926 static void FAST_FUNC
1927 change_lc_ctype(const char *value)
1929 if (value && *value != '\0')
1930 setlocale(LC_CTYPE, value);
1934 static void chkmail(void);
1935 static void changemail(const char *var_value) FAST_FUNC;
1937 # define chkmail() ((void)0)
1939 static void changepath(const char *) FAST_FUNC;
1940 #if ENABLE_ASH_RANDOM_SUPPORT
1941 static void change_random(const char *) FAST_FUNC;
1944 static const struct {
1946 const char *var_text;
1947 void (*var_func)(const char *) FAST_FUNC;
1948 } varinit_data[] = {
1950 * Note: VEXPORT would not work correctly here for NOFORK applets:
1951 * some environment strings may be constant.
1953 { VSTRFIXED|VTEXTFIXED , defifsvar , NULL },
1955 { VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL" , changemail },
1956 { VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH" , changemail },
1958 { VSTRFIXED|VTEXTFIXED , bb_PATH_root_path, changepath },
1959 { VSTRFIXED|VTEXTFIXED , "PS1=$ " , NULL },
1960 { VSTRFIXED|VTEXTFIXED , "PS2=> " , NULL },
1961 { VSTRFIXED|VTEXTFIXED , "PS4=+ " , NULL },
1962 #if ENABLE_ASH_GETOPTS
1963 { VSTRFIXED|VTEXTFIXED , defoptindvar, getoptsreset },
1965 #if ENABLE_ASH_RANDOM_SUPPORT
1966 { VSTRFIXED|VTEXTFIXED|VUNSET|VDYNAMIC, "RANDOM", change_random },
1968 #if ENABLE_LOCALE_SUPPORT
1969 { VSTRFIXED|VTEXTFIXED|VUNSET, "LC_ALL" , change_lc_all },
1970 { VSTRFIXED|VTEXTFIXED|VUNSET, "LC_CTYPE" , change_lc_ctype },
1972 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
1973 { VSTRFIXED|VTEXTFIXED|VUNSET, "HISTFILE" , NULL },
1979 struct globals_var {
1980 struct shparam shellparam; /* $@ current positional parameters */
1981 struct redirtab *redirlist;
1982 int preverrout_fd; /* save fd2 before print debug if xflag is set. */
1983 struct var *vartab[VTABSIZE];
1984 struct var varinit[ARRAY_SIZE(varinit_data)];
1986 extern struct globals_var *const ash_ptr_to_globals_var;
1987 #define G_var (*ash_ptr_to_globals_var)
1988 #define shellparam (G_var.shellparam )
1989 //#define redirlist (G_var.redirlist )
1990 #define preverrout_fd (G_var.preverrout_fd)
1991 #define vartab (G_var.vartab )
1992 #define varinit (G_var.varinit )
1993 #define INIT_G_var() do { \
1995 (*(struct globals_var**)&ash_ptr_to_globals_var) = xzalloc(sizeof(G_var)); \
1997 for (i = 0; i < ARRAY_SIZE(varinit_data); i++) { \
1998 varinit[i].flags = varinit_data[i].flags; \
1999 varinit[i].var_text = varinit_data[i].var_text; \
2000 varinit[i].var_func = varinit_data[i].var_func; \
2004 #define vifs varinit[0]
2006 # define vmail (&vifs)[1]
2007 # define vmpath (&vmail)[1]
2008 # define vpath (&vmpath)[1]
2010 # define vpath (&vifs)[1]
2012 #define vps1 (&vpath)[1]
2013 #define vps2 (&vps1)[1]
2014 #define vps4 (&vps2)[1]
2015 #if ENABLE_ASH_GETOPTS
2016 # define voptind (&vps4)[1]
2017 # if ENABLE_ASH_RANDOM_SUPPORT
2018 # define vrandom (&voptind)[1]
2021 # if ENABLE_ASH_RANDOM_SUPPORT
2022 # define vrandom (&vps4)[1]
2027 * The following macros access the values of the above variables.
2028 * They have to skip over the name. They return the null string
2029 * for unset variables.
2031 #define ifsval() (vifs.var_text + 4)
2032 #define ifsset() ((vifs.flags & VUNSET) == 0)
2034 # define mailval() (vmail.var_text + 5)
2035 # define mpathval() (vmpath.var_text + 9)
2036 # define mpathset() ((vmpath.flags & VUNSET) == 0)
2038 #define pathval() (vpath.var_text + 5)
2039 #define ps1val() (vps1.var_text + 4)
2040 #define ps2val() (vps2.var_text + 4)
2041 #define ps4val() (vps4.var_text + 4)
2042 #if ENABLE_ASH_GETOPTS
2043 # define optindval() (voptind.var_text + 7)
2046 #if ENABLE_ASH_GETOPTS
2047 static void FAST_FUNC
2048 getoptsreset(const char *value)
2050 shellparam.optind = number(value) ?: 1;
2051 shellparam.optoff = -1;
2056 * Compares two strings up to the first = or '\0'. The first
2057 * string must be terminated by '='; the second may be terminated by
2058 * either '=' or '\0'.
2061 varcmp(const char *p, const char *q)
2065 while ((c = *p) == (d = *q)) {
2066 if (c == '\0' || c == '=')
2080 * Find the appropriate entry in the hash table from the name.
2082 static struct var **
2083 hashvar(const char *p)
2087 hashval = ((unsigned char) *p) << 4;
2088 while (*p && *p != '=')
2089 hashval += (unsigned char) *p++;
2090 return &vartab[hashval % VTABSIZE];
2094 vpcmp(const void *a, const void *b)
2096 return varcmp(*(const char **)a, *(const char **)b);
2100 * This routine initializes the builtin variables.
2110 * PS1 depends on uid
2112 #if ENABLE_FEATURE_EDITING && ENABLE_FEATURE_EDITING_FANCY_PROMPT
2113 vps1.var_text = "PS1=\\w \\$ ";
2116 vps1.var_text = "PS1=# ";
2119 end = vp + ARRAY_SIZE(varinit);
2121 vpp = hashvar(vp->var_text);
2124 } while (++vp < end);
2127 static struct var **
2128 findvar(struct var **vpp, const char *name)
2130 for (; *vpp; vpp = &(*vpp)->next) {
2131 if (varcmp((*vpp)->var_text, name) == 0) {
2139 * Find the value of a variable. Returns NULL if not set.
2141 static const char* FAST_FUNC
2142 lookupvar(const char *name)
2146 v = *findvar(hashvar(name), name);
2148 #if ENABLE_ASH_RANDOM_SUPPORT
2150 * Dynamic variables are implemented roughly the same way they are
2151 * in bash. Namely, they're "special" so long as they aren't unset.
2152 * As soon as they're unset, they're no longer dynamic, and dynamic
2153 * lookup will no longer happen at that point. -- PFM.
2155 if (v->flags & VDYNAMIC)
2158 if (!(v->flags & VUNSET))
2159 return var_end(v->var_text);
2164 #if ENABLE_UNICODE_SUPPORT
2166 reinit_unicode_for_ash(void)
2168 /* Unicode support should be activated even if LANG is set
2169 * _during_ shell execution, not only if it was set when
2170 * shell was started. Therefore, re-check LANG every time:
2172 if (ENABLE_FEATURE_CHECK_UNICODE_IN_ENV
2173 || ENABLE_UNICODE_USING_LOCALE
2175 const char *s = lookupvar("LC_ALL");
2176 if (!s) s = lookupvar("LC_CTYPE");
2177 if (!s) s = lookupvar("LANG");
2182 # define reinit_unicode_for_ash() ((void)0)
2186 * Search the environment of a builtin command.
2189 bltinlookup(const char *name)
2193 for (sp = cmdenviron; sp; sp = sp->next) {
2194 if (varcmp(sp->text, name) == 0)
2195 return var_end(sp->text);
2197 return lookupvar(name);
2201 * Same as setvar except that the variable and value are passed in
2202 * the first argument as name=value. Since the first argument will
2203 * be actually stored in the table, it should not be a string that
2205 * Called with interrupts off.
2208 setvareq(char *s, int flags)
2210 struct var *vp, **vpp;
2213 flags |= (VEXPORT & (((unsigned) (1 - aflag)) - 1));
2214 vp = *findvar(vpp, s);
2216 if ((vp->flags & (VREADONLY|VDYNAMIC)) == VREADONLY) {
2219 if (flags & VNOSAVE)
2223 ash_msg_and_raise_error("%.*s: is read only", strchrnul(n, '=') - n, n);
2229 if (vp->var_func && !(flags & VNOFUNC))
2230 vp->var_func(var_end(s));
2232 if (!(vp->flags & (VTEXTFIXED|VSTACK)))
2233 free((char*)vp->var_text);
2235 flags |= vp->flags & ~(VTEXTFIXED|VSTACK|VNOSAVE|VUNSET);
2237 /* variable s is not found */
2240 vp = ckzalloc(sizeof(*vp));
2242 /*vp->func = NULL; - ckzalloc did it */
2245 if (!(flags & (VTEXTFIXED|VSTACK|VNOSAVE)))
2252 * Set the value of a variable. The flags argument is ored with the
2253 * flags of the variable. If val is NULL, the variable is unset.
2256 setvar(const char *name, const char *val, int flags)
2264 q = endofname(name);
2265 p = strchrnul(q, '=');
2267 if (!namelen || p != q)
2268 ash_msg_and_raise_error("%.*s: bad variable name", namelen, name);
2273 vallen = strlen(val);
2277 nameeq = ckmalloc(namelen + vallen + 2);
2278 p = memcpy(nameeq, name, namelen) + namelen;
2281 p = memcpy(p, val, vallen) + vallen;
2284 setvareq(nameeq, flags | VNOSAVE);
2288 static void FAST_FUNC
2289 setvar0(const char *name, const char *val)
2291 setvar(name, val, 0);
2295 * Unset the specified variable.
2298 unsetvar(const char *s)
2304 vpp = findvar(hashvar(s), s);
2308 int flags = vp->flags;
2311 if (flags & VREADONLY)
2313 #if ENABLE_ASH_RANDOM_SUPPORT
2314 vp->flags &= ~VDYNAMIC;
2318 if ((flags & VSTRFIXED) == 0) {
2320 if ((flags & (VTEXTFIXED|VSTACK)) == 0)
2321 free((char*)vp->var_text);
2327 vp->flags &= ~VEXPORT;
2337 * Process a linked list of variable assignments.
2340 listsetvar(struct strlist *list_set_var, int flags)
2342 struct strlist *lp = list_set_var;
2348 setvareq(lp->text, flags);
2355 * Generate a list of variables satisfying the given conditions.
2358 listvars(int on, int off, char ***end)
2369 for (vp = *vpp; vp; vp = vp->next) {
2370 if ((vp->flags & mask) == on) {
2371 if (ep == stackstrend())
2372 ep = growstackstr();
2373 *ep++ = (char*)vp->var_text;
2376 } while (++vpp < vartab + VTABSIZE);
2377 if (ep == stackstrend())
2378 ep = growstackstr();
2382 return grabstackstr(ep);
2386 /* ============ Path search helper
2388 * The variable path (passed by reference) should be set to the start
2389 * of the path before the first call; path_advance will update
2390 * this value as it proceeds. Successive calls to path_advance will return
2391 * the possible path expansions in sequence. If an option (indicated by
2392 * a percent sign) appears in the path entry then the global variable
2393 * pathopt will be set to point to it; otherwise pathopt will be set to
2396 static const char *pathopt; /* set by path_advance */
2399 path_advance(const char **path, const char *name)
2409 for (p = start; *p && *p != ':' && *p != '%'; p++)
2411 len = p - start + strlen(name) + 2; /* "2" is for '/' and '\0' */
2412 while (stackblocksize() < len)
2416 memcpy(q, start, p - start);
2424 while (*p && *p != ':')
2431 return stalloc(len);
2435 /* ============ Prompt */
2437 static smallint doprompt; /* if set, prompt the user */
2438 static smallint needprompt; /* true if interactive and at start of line */
2440 #if ENABLE_FEATURE_EDITING
2441 static line_input_t *line_input_state;
2442 static const char *cmdedit_prompt;
2444 putprompt(const char *s)
2446 if (ENABLE_ASH_EXPAND_PRMT) {
2447 free((char*)cmdedit_prompt);
2448 cmdedit_prompt = ckstrdup(s);
2455 putprompt(const char *s)
2461 #if ENABLE_ASH_EXPAND_PRMT
2462 /* expandstr() needs parsing machinery, so it is far away ahead... */
2463 static const char *expandstr(const char *ps);
2465 #define expandstr(s) s
2469 setprompt_if(smallint do_set, int whichprompt)
2472 IF_ASH_EXPAND_PRMT(struct stackmark smark;)
2479 switch (whichprompt) {
2489 #if ENABLE_ASH_EXPAND_PRMT
2490 pushstackmark(&smark, stackblocksize());
2492 putprompt(expandstr(prompt));
2493 #if ENABLE_ASH_EXPAND_PRMT
2494 popstackmark(&smark);
2499 /* ============ The cd and pwd commands */
2501 #define CD_PHYSICAL 1
2511 while ((i = nextopt("LP")) != '\0') {
2513 flags ^= CD_PHYSICAL;
2522 * Update curdir (the name of the current directory) in response to a
2526 updatepwd(const char *dir)
2533 cdcomppath = sstrdup(dir);
2536 if (curdir == nullstr)
2538 new = stack_putstr(curdir, new);
2540 new = makestrspace(strlen(dir) + 2, new);
2541 lim = (char *)stackblock() + 1;
2545 if (new > lim && *lim == '/')
2550 if (dir[1] == '/' && dir[2] != '/') {
2556 p = strtok(cdcomppath, "/");
2560 if (p[1] == '.' && p[2] == '\0') {
2572 new = stack_putstr(p, new);
2575 p = strtok(NULL, "/");
2580 return stackblock();
2584 * Find out what the current directory is. If we already know the current
2585 * directory, this routine returns immediately.
2590 char *dir = getcwd(NULL, 0); /* huh, using glibc extension? */
2591 return dir ? dir : nullstr;
2595 setpwd(const char *val, int setold)
2599 oldcur = dir = curdir;
2602 setvar("OLDPWD", oldcur, VEXPORT);
2605 if (physdir != nullstr) {
2606 if (physdir != oldcur)
2610 if (oldcur == val || !val) {
2616 dir = ckstrdup(val);
2617 if (oldcur != dir && oldcur != nullstr) {
2622 setvar("PWD", dir, VEXPORT);
2625 static void hashcd(void);
2628 * Actually do the chdir. We also call hashcd to let other routines
2629 * know that the current directory has changed.
2632 docd(const char *dest, int flags)
2634 const char *dir = NULL;
2637 TRACE(("docd(\"%s\", %d) called\n", dest, flags));
2640 if (!(flags & CD_PHYSICAL)) {
2641 dir = updatepwd(dest);
2655 static int FAST_FUNC
2656 cdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
2668 dest = bltinlookup("HOME");
2669 else if (LONE_DASH(dest)) {
2670 dest = bltinlookup("OLDPWD");
2692 path = bltinlookup("CDPATH");
2695 p = path_advance(&path, dest);
2696 if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
2700 if (!docd(p, flags))
2711 ash_msg_and_raise_error("can't cd to %s", dest);
2714 if (flags & CD_PRINT)
2715 out1fmt("%s\n", curdir);
2719 static int FAST_FUNC
2720 pwdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
2723 const char *dir = curdir;
2727 if (physdir == nullstr)
2731 out1fmt("%s\n", dir);
2736 /* ============ ... */
2739 #define IBUFSIZ (ENABLE_FEATURE_EDITING ? CONFIG_FEATURE_EDITING_MAX_LEN : 1024)
2741 /* Syntax classes */
2742 #define CWORD 0 /* character is nothing special */
2743 #define CNL 1 /* newline character */
2744 #define CBACK 2 /* a backslash character */
2745 #define CSQUOTE 3 /* single quote */
2746 #define CDQUOTE 4 /* double quote */
2747 #define CENDQUOTE 5 /* a terminating quote */
2748 #define CBQUOTE 6 /* backwards single quote */
2749 #define CVAR 7 /* a dollar sign */
2750 #define CENDVAR 8 /* a '}' character */
2751 #define CLP 9 /* a left paren in arithmetic */
2752 #define CRP 10 /* a right paren in arithmetic */
2753 #define CENDFILE 11 /* end of file */
2754 #define CCTL 12 /* like CWORD, except it must be escaped */
2755 #define CSPCL 13 /* these terminate a word */
2756 #define CIGN 14 /* character should be ignored */
2759 #if ENABLE_ASH_ALIAS
2763 #define USE_SIT_FUNCTION ENABLE_ASH_OPTIMIZE_FOR_SIZE
2765 #if ENABLE_FEATURE_SH_MATH
2766 # define SIT_ITEM(a,b,c,d) (a | (b << 4) | (c << 8) | (d << 12))
2768 # define SIT_ITEM(a,b,c,d) (a | (b << 4) | (c << 8))
2770 static const uint16_t S_I_T[] ALIGN2 = {
2771 #if ENABLE_ASH_ALIAS
2772 SIT_ITEM(CSPCL , CIGN , CIGN , CIGN ), /* 0, PEOA */
2774 SIT_ITEM(CSPCL , CWORD , CWORD, CWORD ), /* 1, ' ' */
2775 SIT_ITEM(CNL , CNL , CNL , CNL ), /* 2, \n */
2776 SIT_ITEM(CWORD , CCTL , CCTL , CWORD ), /* 3, !*-/:=?[]~ */
2777 SIT_ITEM(CDQUOTE , CENDQUOTE, CWORD, CWORD ), /* 4, '"' */
2778 SIT_ITEM(CVAR , CVAR , CWORD, CVAR ), /* 5, $ */
2779 SIT_ITEM(CSQUOTE , CWORD , CENDQUOTE, CWORD), /* 6, "'" */
2780 SIT_ITEM(CSPCL , CWORD , CWORD, CLP ), /* 7, ( */
2781 SIT_ITEM(CSPCL , CWORD , CWORD, CRP ), /* 8, ) */
2782 SIT_ITEM(CBACK , CBACK , CCTL , CBACK ), /* 9, \ */
2783 SIT_ITEM(CBQUOTE , CBQUOTE , CWORD, CBQUOTE), /* 10, ` */
2784 SIT_ITEM(CENDVAR , CENDVAR , CWORD, CENDVAR), /* 11, } */
2785 #if !USE_SIT_FUNCTION
2786 SIT_ITEM(CENDFILE, CENDFILE , CENDFILE, CENDFILE),/* 12, PEOF */
2787 SIT_ITEM(CWORD , CWORD , CWORD, CWORD ), /* 13, 0-9A-Za-z */
2788 SIT_ITEM(CCTL , CCTL , CCTL , CCTL ) /* 14, CTLESC ... */
2792 /* Constants below must match table above */
2794 #if ENABLE_ASH_ALIAS
2795 CSPCL_CIGN_CIGN_CIGN , /* 0 */
2797 CSPCL_CWORD_CWORD_CWORD , /* 1 */
2798 CNL_CNL_CNL_CNL , /* 2 */
2799 CWORD_CCTL_CCTL_CWORD , /* 3 */
2800 CDQUOTE_CENDQUOTE_CWORD_CWORD , /* 4 */
2801 CVAR_CVAR_CWORD_CVAR , /* 5 */
2802 CSQUOTE_CWORD_CENDQUOTE_CWORD , /* 6 */
2803 CSPCL_CWORD_CWORD_CLP , /* 7 */
2804 CSPCL_CWORD_CWORD_CRP , /* 8 */
2805 CBACK_CBACK_CCTL_CBACK , /* 9 */
2806 CBQUOTE_CBQUOTE_CWORD_CBQUOTE , /* 10 */
2807 CENDVAR_CENDVAR_CWORD_CENDVAR , /* 11 */
2808 CENDFILE_CENDFILE_CENDFILE_CENDFILE, /* 12 */
2809 CWORD_CWORD_CWORD_CWORD , /* 13 */
2810 CCTL_CCTL_CCTL_CCTL , /* 14 */
2813 /* c in SIT(c, syntax) must be an *unsigned char* or PEOA or PEOF,
2814 * caller must ensure proper cast on it if c is *char_ptr!
2816 /* Values for syntax param */
2817 #define BASESYNTAX 0 /* not in quotes */
2818 #define DQSYNTAX 1 /* in double quotes */
2819 #define SQSYNTAX 2 /* in single quotes */
2820 #define ARISYNTAX 3 /* in arithmetic */
2821 #define PSSYNTAX 4 /* prompt. never passed to SIT() */
2823 #if USE_SIT_FUNCTION
2826 SIT(int c, int syntax)
2828 /* Used to also have '/' in this string: "\t\n !\"$&'()*-/:;<=>?[\\]`|}~" */
2829 static const char spec_symbls[] ALIGN1 = "\t\n !\"$&'()*-:;<=>?[\\]`|}~";
2831 * This causes '/' to be prepended with CTLESC in dquoted string,
2832 * making "./file"* treated incorrectly because we feed
2833 * ".\/file*" string to glob(), confusing it (see expandmeta func).
2834 * The "homegrown" glob implementation is okay with that,
2835 * but glibc one isn't. With '/' always treated as CWORD,
2838 # if ENABLE_ASH_ALIAS
2839 static const uint8_t syntax_index_table[] ALIGN1 = {
2840 1, 2, 1, 3, 4, 5, 1, 6, /* "\t\n !\"$&'" */
2841 7, 8, 3, 3,/*3,*/3, 1, 1, /* "()*-/:;<" */
2842 3, 1, 3, 3, 9, 3, 10, 1, /* "=>?[\\]`|" */
2846 static const uint8_t syntax_index_table[] ALIGN1 = {
2847 0, 1, 0, 2, 3, 4, 0, 5, /* "\t\n !\"$&'" */
2848 6, 7, 2, 2,/*2,*/2, 0, 0, /* "()*-/:;<" */
2849 2, 0, 2, 2, 8, 2, 9, 0, /* "=>?[\\]`|" */
2858 # if ENABLE_ASH_ALIAS
2864 /* Cast is purely for paranoia here,
2865 * just in case someone passed signed char to us */
2866 if ((unsigned char)c >= CTL_FIRST
2867 && (unsigned char)c <= CTL_LAST
2871 s = strchrnul(spec_symbls, c);
2874 indx = syntax_index_table[s - spec_symbls];
2876 return (S_I_T[indx] >> (syntax*4)) & 0xf;
2879 #else /* !USE_SIT_FUNCTION */
2881 static const uint8_t syntax_index_table[] ALIGN1 = {
2882 /* BASESYNTAX_DQSYNTAX_SQSYNTAX_ARISYNTAX */
2883 /* 0 */ CWORD_CWORD_CWORD_CWORD,
2884 /* 1 */ CWORD_CWORD_CWORD_CWORD,
2885 /* 2 */ CWORD_CWORD_CWORD_CWORD,
2886 /* 3 */ CWORD_CWORD_CWORD_CWORD,
2887 /* 4 */ CWORD_CWORD_CWORD_CWORD,
2888 /* 5 */ CWORD_CWORD_CWORD_CWORD,
2889 /* 6 */ CWORD_CWORD_CWORD_CWORD,
2890 /* 7 */ CWORD_CWORD_CWORD_CWORD,
2891 /* 8 */ CWORD_CWORD_CWORD_CWORD,
2892 /* 9 "\t" */ CSPCL_CWORD_CWORD_CWORD,
2893 /* 10 "\n" */ CNL_CNL_CNL_CNL,
2894 /* 11 */ CWORD_CWORD_CWORD_CWORD,
2895 /* 12 */ CWORD_CWORD_CWORD_CWORD,
2896 /* 13 */ CWORD_CWORD_CWORD_CWORD,
2897 /* 14 */ CWORD_CWORD_CWORD_CWORD,
2898 /* 15 */ CWORD_CWORD_CWORD_CWORD,
2899 /* 16 */ CWORD_CWORD_CWORD_CWORD,
2900 /* 17 */ CWORD_CWORD_CWORD_CWORD,
2901 /* 18 */ CWORD_CWORD_CWORD_CWORD,
2902 /* 19 */ CWORD_CWORD_CWORD_CWORD,
2903 /* 20 */ CWORD_CWORD_CWORD_CWORD,
2904 /* 21 */ CWORD_CWORD_CWORD_CWORD,
2905 /* 22 */ CWORD_CWORD_CWORD_CWORD,
2906 /* 23 */ CWORD_CWORD_CWORD_CWORD,
2907 /* 24 */ CWORD_CWORD_CWORD_CWORD,
2908 /* 25 */ CWORD_CWORD_CWORD_CWORD,
2909 /* 26 */ CWORD_CWORD_CWORD_CWORD,
2910 /* 27 */ CWORD_CWORD_CWORD_CWORD,
2911 /* 28 */ CWORD_CWORD_CWORD_CWORD,
2912 /* 29 */ CWORD_CWORD_CWORD_CWORD,
2913 /* 30 */ CWORD_CWORD_CWORD_CWORD,
2914 /* 31 */ CWORD_CWORD_CWORD_CWORD,
2915 /* 32 " " */ CSPCL_CWORD_CWORD_CWORD,
2916 /* 33 "!" */ CWORD_CCTL_CCTL_CWORD,
2917 /* 34 """ */ CDQUOTE_CENDQUOTE_CWORD_CWORD,
2918 /* 35 "#" */ CWORD_CWORD_CWORD_CWORD,
2919 /* 36 "$" */ CVAR_CVAR_CWORD_CVAR,
2920 /* 37 "%" */ CWORD_CWORD_CWORD_CWORD,
2921 /* 38 "&" */ CSPCL_CWORD_CWORD_CWORD,
2922 /* 39 "'" */ CSQUOTE_CWORD_CENDQUOTE_CWORD,
2923 /* 40 "(" */ CSPCL_CWORD_CWORD_CLP,
2924 /* 41 ")" */ CSPCL_CWORD_CWORD_CRP,
2925 /* 42 "*" */ CWORD_CCTL_CCTL_CWORD,
2926 /* 43 "+" */ CWORD_CWORD_CWORD_CWORD,
2927 /* 44 "," */ CWORD_CWORD_CWORD_CWORD,
2928 /* 45 "-" */ CWORD_CCTL_CCTL_CWORD,
2929 /* 46 "." */ CWORD_CWORD_CWORD_CWORD,
2930 /* "/" was CWORD_CCTL_CCTL_CWORD, see comment in SIT() function why this is changed: */
2931 /* 47 "/" */ CWORD_CWORD_CWORD_CWORD,
2932 /* 48 "0" */ CWORD_CWORD_CWORD_CWORD,
2933 /* 49 "1" */ CWORD_CWORD_CWORD_CWORD,
2934 /* 50 "2" */ CWORD_CWORD_CWORD_CWORD,
2935 /* 51 "3" */ CWORD_CWORD_CWORD_CWORD,
2936 /* 52 "4" */ CWORD_CWORD_CWORD_CWORD,
2937 /* 53 "5" */ CWORD_CWORD_CWORD_CWORD,
2938 /* 54 "6" */ CWORD_CWORD_CWORD_CWORD,
2939 /* 55 "7" */ CWORD_CWORD_CWORD_CWORD,
2940 /* 56 "8" */ CWORD_CWORD_CWORD_CWORD,
2941 /* 57 "9" */ CWORD_CWORD_CWORD_CWORD,
2942 /* 58 ":" */ CWORD_CCTL_CCTL_CWORD,
2943 /* 59 ";" */ CSPCL_CWORD_CWORD_CWORD,
2944 /* 60 "<" */ CSPCL_CWORD_CWORD_CWORD,
2945 /* 61 "=" */ CWORD_CCTL_CCTL_CWORD,
2946 /* 62 ">" */ CSPCL_CWORD_CWORD_CWORD,
2947 /* 63 "?" */ CWORD_CCTL_CCTL_CWORD,
2948 /* 64 "@" */ CWORD_CWORD_CWORD_CWORD,
2949 /* 65 "A" */ CWORD_CWORD_CWORD_CWORD,
2950 /* 66 "B" */ CWORD_CWORD_CWORD_CWORD,
2951 /* 67 "C" */ CWORD_CWORD_CWORD_CWORD,
2952 /* 68 "D" */ CWORD_CWORD_CWORD_CWORD,
2953 /* 69 "E" */ CWORD_CWORD_CWORD_CWORD,
2954 /* 70 "F" */ CWORD_CWORD_CWORD_CWORD,
2955 /* 71 "G" */ CWORD_CWORD_CWORD_CWORD,
2956 /* 72 "H" */ CWORD_CWORD_CWORD_CWORD,
2957 /* 73 "I" */ CWORD_CWORD_CWORD_CWORD,
2958 /* 74 "J" */ CWORD_CWORD_CWORD_CWORD,
2959 /* 75 "K" */ CWORD_CWORD_CWORD_CWORD,
2960 /* 76 "L" */ CWORD_CWORD_CWORD_CWORD,
2961 /* 77 "M" */ CWORD_CWORD_CWORD_CWORD,
2962 /* 78 "N" */ CWORD_CWORD_CWORD_CWORD,
2963 /* 79 "O" */ CWORD_CWORD_CWORD_CWORD,
2964 /* 80 "P" */ CWORD_CWORD_CWORD_CWORD,
2965 /* 81 "Q" */ CWORD_CWORD_CWORD_CWORD,
2966 /* 82 "R" */ CWORD_CWORD_CWORD_CWORD,
2967 /* 83 "S" */ CWORD_CWORD_CWORD_CWORD,
2968 /* 84 "T" */ CWORD_CWORD_CWORD_CWORD,
2969 /* 85 "U" */ CWORD_CWORD_CWORD_CWORD,
2970 /* 86 "V" */ CWORD_CWORD_CWORD_CWORD,
2971 /* 87 "W" */ CWORD_CWORD_CWORD_CWORD,
2972 /* 88 "X" */ CWORD_CWORD_CWORD_CWORD,
2973 /* 89 "Y" */ CWORD_CWORD_CWORD_CWORD,
2974 /* 90 "Z" */ CWORD_CWORD_CWORD_CWORD,
2975 /* 91 "[" */ CWORD_CCTL_CCTL_CWORD,
2976 /* 92 "\" */ CBACK_CBACK_CCTL_CBACK,
2977 /* 93 "]" */ CWORD_CCTL_CCTL_CWORD,
2978 /* 94 "^" */ CWORD_CWORD_CWORD_CWORD,
2979 /* 95 "_" */ CWORD_CWORD_CWORD_CWORD,
2980 /* 96 "`" */ CBQUOTE_CBQUOTE_CWORD_CBQUOTE,
2981 /* 97 "a" */ CWORD_CWORD_CWORD_CWORD,
2982 /* 98 "b" */ CWORD_CWORD_CWORD_CWORD,
2983 /* 99 "c" */ CWORD_CWORD_CWORD_CWORD,
2984 /* 100 "d" */ CWORD_CWORD_CWORD_CWORD,
2985 /* 101 "e" */ CWORD_CWORD_CWORD_CWORD,
2986 /* 102 "f" */ CWORD_CWORD_CWORD_CWORD,
2987 /* 103 "g" */ CWORD_CWORD_CWORD_CWORD,
2988 /* 104 "h" */ CWORD_CWORD_CWORD_CWORD,
2989 /* 105 "i" */ CWORD_CWORD_CWORD_CWORD,
2990 /* 106 "j" */ CWORD_CWORD_CWORD_CWORD,
2991 /* 107 "k" */ CWORD_CWORD_CWORD_CWORD,
2992 /* 108 "l" */ CWORD_CWORD_CWORD_CWORD,
2993 /* 109 "m" */ CWORD_CWORD_CWORD_CWORD,
2994 /* 110 "n" */ CWORD_CWORD_CWORD_CWORD,
2995 /* 111 "o" */ CWORD_CWORD_CWORD_CWORD,
2996 /* 112 "p" */ CWORD_CWORD_CWORD_CWORD,
2997 /* 113 "q" */ CWORD_CWORD_CWORD_CWORD,
2998 /* 114 "r" */ CWORD_CWORD_CWORD_CWORD,
2999 /* 115 "s" */ CWORD_CWORD_CWORD_CWORD,
3000 /* 116 "t" */ CWORD_CWORD_CWORD_CWORD,
3001 /* 117 "u" */ CWORD_CWORD_CWORD_CWORD,
3002 /* 118 "v" */ CWORD_CWORD_CWORD_CWORD,
3003 /* 119 "w" */ CWORD_CWORD_CWORD_CWORD,
3004 /* 120 "x" */ CWORD_CWORD_CWORD_CWORD,
3005 /* 121 "y" */ CWORD_CWORD_CWORD_CWORD,
3006 /* 122 "z" */ CWORD_CWORD_CWORD_CWORD,
3007 /* 123 "{" */ CWORD_CWORD_CWORD_CWORD,
3008 /* 124 "|" */ CSPCL_CWORD_CWORD_CWORD,
3009 /* 125 "}" */ CENDVAR_CENDVAR_CWORD_CENDVAR,
3010 /* 126 "~" */ CWORD_CCTL_CCTL_CWORD,
3011 /* 127 del */ CWORD_CWORD_CWORD_CWORD,
3012 /* 128 0x80 */ CWORD_CWORD_CWORD_CWORD,
3013 /* 129 CTLESC */ CCTL_CCTL_CCTL_CCTL,
3014 /* 130 CTLVAR */ CCTL_CCTL_CCTL_CCTL,
3015 /* 131 CTLENDVAR */ CCTL_CCTL_CCTL_CCTL,
3016 /* 132 CTLBACKQ */ CCTL_CCTL_CCTL_CCTL,
3017 /* 133 CTLQUOTE */ CCTL_CCTL_CCTL_CCTL,
3018 /* 134 CTLARI */ CCTL_CCTL_CCTL_CCTL,
3019 /* 135 CTLENDARI */ CCTL_CCTL_CCTL_CCTL,
3020 /* 136 CTLQUOTEMARK */ CCTL_CCTL_CCTL_CCTL,
3021 /* 137 */ CWORD_CWORD_CWORD_CWORD,
3022 /* 138 */ CWORD_CWORD_CWORD_CWORD,
3023 /* 139 */ CWORD_CWORD_CWORD_CWORD,
3024 /* 140 */ CWORD_CWORD_CWORD_CWORD,
3025 /* 141 */ CWORD_CWORD_CWORD_CWORD,
3026 /* 142 */ CWORD_CWORD_CWORD_CWORD,
3027 /* 143 */ CWORD_CWORD_CWORD_CWORD,
3028 /* 144 */ CWORD_CWORD_CWORD_CWORD,
3029 /* 145 */ CWORD_CWORD_CWORD_CWORD,
3030 /* 146 */ CWORD_CWORD_CWORD_CWORD,
3031 /* 147 */ CWORD_CWORD_CWORD_CWORD,
3032 /* 148 */ CWORD_CWORD_CWORD_CWORD,
3033 /* 149 */ CWORD_CWORD_CWORD_CWORD,
3034 /* 150 */ CWORD_CWORD_CWORD_CWORD,
3035 /* 151 */ CWORD_CWORD_CWORD_CWORD,
3036 /* 152 */ CWORD_CWORD_CWORD_CWORD,
3037 /* 153 */ CWORD_CWORD_CWORD_CWORD,
3038 /* 154 */ CWORD_CWORD_CWORD_CWORD,
3039 /* 155 */ CWORD_CWORD_CWORD_CWORD,
3040 /* 156 */ CWORD_CWORD_CWORD_CWORD,
3041 /* 157 */ CWORD_CWORD_CWORD_CWORD,
3042 /* 158 */ CWORD_CWORD_CWORD_CWORD,
3043 /* 159 */ CWORD_CWORD_CWORD_CWORD,
3044 /* 160 */ CWORD_CWORD_CWORD_CWORD,
3045 /* 161 */ CWORD_CWORD_CWORD_CWORD,
3046 /* 162 */ CWORD_CWORD_CWORD_CWORD,
3047 /* 163 */ CWORD_CWORD_CWORD_CWORD,
3048 /* 164 */ CWORD_CWORD_CWORD_CWORD,
3049 /* 165 */ CWORD_CWORD_CWORD_CWORD,
3050 /* 166 */ CWORD_CWORD_CWORD_CWORD,
3051 /* 167 */ CWORD_CWORD_CWORD_CWORD,
3052 /* 168 */ CWORD_CWORD_CWORD_CWORD,
3053 /* 169 */ CWORD_CWORD_CWORD_CWORD,
3054 /* 170 */ CWORD_CWORD_CWORD_CWORD,
3055 /* 171 */ CWORD_CWORD_CWORD_CWORD,
3056 /* 172 */ CWORD_CWORD_CWORD_CWORD,
3057 /* 173 */ CWORD_CWORD_CWORD_CWORD,
3058 /* 174 */ CWORD_CWORD_CWORD_CWORD,
3059 /* 175 */ CWORD_CWORD_CWORD_CWORD,
3060 /* 176 */ CWORD_CWORD_CWORD_CWORD,
3061 /* 177 */ CWORD_CWORD_CWORD_CWORD,
3062 /* 178 */ CWORD_CWORD_CWORD_CWORD,
3063 /* 179 */ CWORD_CWORD_CWORD_CWORD,
3064 /* 180 */ CWORD_CWORD_CWORD_CWORD,
3065 /* 181 */ CWORD_CWORD_CWORD_CWORD,
3066 /* 182 */ CWORD_CWORD_CWORD_CWORD,
3067 /* 183 */ CWORD_CWORD_CWORD_CWORD,
3068 /* 184 */ CWORD_CWORD_CWORD_CWORD,
3069 /* 185 */ CWORD_CWORD_CWORD_CWORD,
3070 /* 186 */ CWORD_CWORD_CWORD_CWORD,
3071 /* 187 */ CWORD_CWORD_CWORD_CWORD,
3072 /* 188 */ CWORD_CWORD_CWORD_CWORD,
3073 /* 189 */ CWORD_CWORD_CWORD_CWORD,
3074 /* 190 */ CWORD_CWORD_CWORD_CWORD,
3075 /* 191 */ CWORD_CWORD_CWORD_CWORD,
3076 /* 192 */ CWORD_CWORD_CWORD_CWORD,
3077 /* 193 */ CWORD_CWORD_CWORD_CWORD,
3078 /* 194 */ CWORD_CWORD_CWORD_CWORD,
3079 /* 195 */ CWORD_CWORD_CWORD_CWORD,
3080 /* 196 */ CWORD_CWORD_CWORD_CWORD,
3081 /* 197 */ CWORD_CWORD_CWORD_CWORD,
3082 /* 198 */ CWORD_CWORD_CWORD_CWORD,
3083 /* 199 */ CWORD_CWORD_CWORD_CWORD,
3084 /* 200 */ CWORD_CWORD_CWORD_CWORD,
3085 /* 201 */ CWORD_CWORD_CWORD_CWORD,
3086 /* 202 */ CWORD_CWORD_CWORD_CWORD,
3087 /* 203 */ CWORD_CWORD_CWORD_CWORD,
3088 /* 204 */ CWORD_CWORD_CWORD_CWORD,
3089 /* 205 */ CWORD_CWORD_CWORD_CWORD,
3090 /* 206 */ CWORD_CWORD_CWORD_CWORD,
3091 /* 207 */ CWORD_CWORD_CWORD_CWORD,
3092 /* 208 */ CWORD_CWORD_CWORD_CWORD,
3093 /* 209 */ CWORD_CWORD_CWORD_CWORD,
3094 /* 210 */ CWORD_CWORD_CWORD_CWORD,
3095 /* 211 */ CWORD_CWORD_CWORD_CWORD,
3096 /* 212 */ CWORD_CWORD_CWORD_CWORD,
3097 /* 213 */ CWORD_CWORD_CWORD_CWORD,
3098 /* 214 */ CWORD_CWORD_CWORD_CWORD,
3099 /* 215 */ CWORD_CWORD_CWORD_CWORD,
3100 /* 216 */ CWORD_CWORD_CWORD_CWORD,
3101 /* 217 */ CWORD_CWORD_CWORD_CWORD,
3102 /* 218 */ CWORD_CWORD_CWORD_CWORD,
3103 /* 219 */ CWORD_CWORD_CWORD_CWORD,
3104 /* 220 */ CWORD_CWORD_CWORD_CWORD,
3105 /* 221 */ CWORD_CWORD_CWORD_CWORD,
3106 /* 222 */ CWORD_CWORD_CWORD_CWORD,
3107 /* 223 */ CWORD_CWORD_CWORD_CWORD,
3108 /* 224 */ CWORD_CWORD_CWORD_CWORD,
3109 /* 225 */ CWORD_CWORD_CWORD_CWORD,
3110 /* 226 */ CWORD_CWORD_CWORD_CWORD,
3111 /* 227 */ CWORD_CWORD_CWORD_CWORD,
3112 /* 228 */ CWORD_CWORD_CWORD_CWORD,
3113 /* 229 */ CWORD_CWORD_CWORD_CWORD,
3114 /* 230 */ CWORD_CWORD_CWORD_CWORD,
3115 /* 231 */ CWORD_CWORD_CWORD_CWORD,
3116 /* 232 */ CWORD_CWORD_CWORD_CWORD,
3117 /* 233 */ CWORD_CWORD_CWORD_CWORD,
3118 /* 234 */ CWORD_CWORD_CWORD_CWORD,
3119 /* 235 */ CWORD_CWORD_CWORD_CWORD,
3120 /* 236 */ CWORD_CWORD_CWORD_CWORD,
3121 /* 237 */ CWORD_CWORD_CWORD_CWORD,
3122 /* 238 */ CWORD_CWORD_CWORD_CWORD,
3123 /* 239 */ CWORD_CWORD_CWORD_CWORD,
3124 /* 230 */ CWORD_CWORD_CWORD_CWORD,
3125 /* 241 */ CWORD_CWORD_CWORD_CWORD,
3126 /* 242 */ CWORD_CWORD_CWORD_CWORD,
3127 /* 243 */ CWORD_CWORD_CWORD_CWORD,
3128 /* 244 */ CWORD_CWORD_CWORD_CWORD,
3129 /* 245 */ CWORD_CWORD_CWORD_CWORD,
3130 /* 246 */ CWORD_CWORD_CWORD_CWORD,
3131 /* 247 */ CWORD_CWORD_CWORD_CWORD,
3132 /* 248 */ CWORD_CWORD_CWORD_CWORD,
3133 /* 249 */ CWORD_CWORD_CWORD_CWORD,
3134 /* 250 */ CWORD_CWORD_CWORD_CWORD,
3135 /* 251 */ CWORD_CWORD_CWORD_CWORD,
3136 /* 252 */ CWORD_CWORD_CWORD_CWORD,
3137 /* 253 */ CWORD_CWORD_CWORD_CWORD,
3138 /* 254 */ CWORD_CWORD_CWORD_CWORD,
3139 /* 255 */ CWORD_CWORD_CWORD_CWORD,
3140 /* PEOF */ CENDFILE_CENDFILE_CENDFILE_CENDFILE,
3141 # if ENABLE_ASH_ALIAS
3142 /* PEOA */ CSPCL_CIGN_CIGN_CIGN,
3147 # define SIT(c, syntax) ((S_I_T[syntax_index_table[c]] >> ((syntax)*4)) & 0xf)
3148 #else /* debug version, caught one signed char bug */
3149 # define SIT(c, syntax) \
3151 if ((c) < 0 || (c) > (PEOF + ENABLE_ASH_ALIAS)) \
3152 bb_error_msg_and_die("line:%d c:%d", __LINE__, (c)); \
3153 if ((syntax) < 0 || (syntax) > (2 + ENABLE_FEATURE_SH_MATH)) \
3154 bb_error_msg_and_die("line:%d c:%d", __LINE__, (c)); \
3155 ((S_I_T[syntax_index_table[c]] >> ((syntax)*4)) & 0xf); \
3159 #endif /* !USE_SIT_FUNCTION */
3162 /* ============ Alias handling */
3164 #if ENABLE_ASH_ALIAS
3166 #define ALIASINUSE 1
3177 static struct alias **atab; // [ATABSIZE];
3178 #define INIT_G_alias() do { \
3179 atab = xzalloc(ATABSIZE * sizeof(atab[0])); \
3183 static struct alias **
3184 __lookupalias(const char *name)
3186 unsigned int hashval;
3193 ch = (unsigned char)*p;
3197 ch = (unsigned char)*++p;
3199 app = &atab[hashval % ATABSIZE];
3201 for (; *app; app = &(*app)->next) {
3202 if (strcmp(name, (*app)->name) == 0) {
3210 static struct alias *
3211 lookupalias(const char *name, int check)
3213 struct alias *ap = *__lookupalias(name);
3215 if (check && ap && (ap->flag & ALIASINUSE))
3220 static struct alias *
3221 freealias(struct alias *ap)
3225 if (ap->flag & ALIASINUSE) {
3226 ap->flag |= ALIASDEAD;
3238 setalias(const char *name, const char *val)
3240 struct alias *ap, **app;
3242 app = __lookupalias(name);
3246 if (!(ap->flag & ALIASINUSE)) {
3249 ap->val = ckstrdup(val);
3250 ap->flag &= ~ALIASDEAD;
3253 ap = ckzalloc(sizeof(struct alias));
3254 ap->name = ckstrdup(name);
3255 ap->val = ckstrdup(val);
3256 /*ap->flag = 0; - ckzalloc did it */
3257 /*ap->next = NULL;*/
3264 unalias(const char *name)
3268 app = __lookupalias(name);
3272 *app = freealias(*app);
3283 struct alias *ap, **app;
3287 for (i = 0; i < ATABSIZE; i++) {
3289 for (ap = *app; ap; ap = *app) {
3290 *app = freealias(*app);
3300 printalias(const struct alias *ap)
3302 out1fmt("%s=%s\n", ap->name, single_quote(ap->val));
3306 * TODO - sort output
3308 static int FAST_FUNC
3309 aliascmd(int argc UNUSED_PARAM, char **argv)
3318 for (i = 0; i < ATABSIZE; i++) {
3319 for (ap = atab[i]; ap; ap = ap->next) {
3325 while ((n = *++argv) != NULL) {
3326 v = strchr(n+1, '=');
3327 if (v == NULL) { /* n+1: funny ksh stuff */
3328 ap = *__lookupalias(n);
3330 fprintf(stderr, "%s: %s not found\n", "alias", n);
3343 static int FAST_FUNC
3344 unaliascmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
3348 while ((i = nextopt("a")) != '\0') {
3354 for (i = 0; *argptr; argptr++) {
3355 if (unalias(*argptr)) {
3356 fprintf(stderr, "%s: %s not found\n", "unalias", *argptr);
3364 #endif /* ASH_ALIAS */
3367 /* Mode argument to forkshell. Don't change FORK_FG or FORK_BG. */
3370 #define FORK_NOJOB 2
3372 /* mode flags for showjob(s) */
3373 #define SHOW_ONLY_PGID 0x01 /* show only pgid (jobs -p) */
3374 #define SHOW_PIDS 0x02 /* show individual pids, not just one line per job */
3375 #define SHOW_CHANGED 0x04 /* only jobs whose state has changed */
3376 #define SHOW_STDERR 0x08 /* print to stderr (else stdout) */
3379 * A job structure contains information about a job. A job is either a
3380 * single process or a set of processes contained in a pipeline. In the
3381 * latter case, pidlist will be non-NULL, and will point to a -1 terminated
3385 pid_t ps_pid; /* process id */
3386 int ps_status; /* last process status from wait() */
3387 char *ps_cmd; /* text of command being run */
3391 struct procstat ps0; /* status of process */
3392 struct procstat *ps; /* status or processes when more than one */
3394 int stopstatus; /* status of a stopped job */
3396 unsigned nprocs; /* number of processes */
3398 #define JOBRUNNING 0 /* at least one proc running */
3399 #define JOBSTOPPED 1 /* all procs are stopped */
3400 #define JOBDONE 2 /* all procs are completed */
3404 sigint: 1, /* job was killed by SIGINT */
3405 jobctl: 1, /* job running under job control */
3407 waited: 1, /* true if this entry has been waited for */
3408 used: 1, /* true if this entry is in used */
3409 changed: 1; /* true if status has changed */
3410 struct job *prev_job; /* previous job */
3413 static struct job *makejob(/*union node *,*/ int);
3414 static int forkshell(struct job *, union node *, int);
3415 static int waitforjob(struct job *);
3418 enum { doing_jobctl = 0 };
3419 #define setjobctl(on) do {} while (0)
3421 static smallint doing_jobctl; //references:8
3422 static void setjobctl(int);
3429 ignoresig(int signo)
3431 /* Avoid unnecessary system calls. Is it already SIG_IGNed? */
3432 if (sigmode[signo - 1] != S_IGN && sigmode[signo - 1] != S_HARD_IGN) {
3433 /* No, need to do it */
3434 signal(signo, SIG_IGN);
3436 sigmode[signo - 1] = S_HARD_IGN;
3440 * Only one usage site - in setsignal()
3443 signal_handler(int signo)
3445 if (signo == SIGCHLD) {
3451 gotsig[signo - 1] = 1;
3452 pending_sig = signo;
3454 if (signo == SIGINT && !trap[SIGINT]) {
3455 if (!suppress_int) {
3457 raise_interrupt(); /* does not return */
3464 * Set the signal handler for the specified signal. The routine figures
3465 * out what it should be set to.
3468 setsignal(int signo)
3471 char cur_act, new_act;
3472 struct sigaction act;
3476 if (t != NULL) { /* trap for this sig is set */
3478 if (t[0] == '\0') /* trap is "": ignore this sig */
3482 if (rootshell && new_act == S_DFL) {
3485 if (iflag || minusc || sflag == 0)
3494 * "In all cases, bash ignores SIGQUIT. Non-builtin
3495 * commands run by bash have signal handlers
3496 * set to the values inherited by the shell
3497 * from its parent". */
3513 //TODO: if !rootshell, we reset SIGQUIT to DFL,
3514 //whereas we have to restore it to what shell got on entry
3515 //from the parent. See comment above
3517 if (signo == SIGCHLD)
3520 t = &sigmode[signo - 1];
3523 /* current setting is not yet known */
3524 if (sigaction(signo, NULL, &act)) {
3525 /* pretend it worked; maybe we should give a warning,
3526 * but other shells don't. We don't alter sigmode,
3527 * so we retry every time.
3528 * btw, in Linux it never fails. --vda */
3531 if (act.sa_handler == SIG_IGN) {
3532 cur_act = S_HARD_IGN;
3534 && (signo == SIGTSTP || signo == SIGTTIN || signo == SIGTTOU)
3536 cur_act = S_IGN; /* don't hard ignore these */
3540 if (cur_act == S_HARD_IGN || cur_act == new_act)
3543 act.sa_handler = SIG_DFL;
3546 act.sa_handler = signal_handler;
3549 act.sa_handler = SIG_IGN;
3553 /* flags and mask matter only if !DFL and !IGN, but we do it
3554 * for all cases for more deterministic behavior:
3557 sigfillset(&act.sa_mask);
3559 sigaction_set(signo, &act);
3564 /* mode flags for set_curjob */
3565 #define CUR_DELETE 2
3566 #define CUR_RUNNING 1
3567 #define CUR_STOPPED 0
3570 /* pgrp of shell on invocation */
3571 static int initialpgrp; //references:2
3572 static int ttyfd = -1; //5
3575 static struct job *jobtab; //5
3577 static unsigned njobs; //4
3579 static struct job *curjob; //lots
3580 /* number of presumed living untracked jobs */
3581 static int jobless; //4
3584 /* Bash has a feature: it restores termios after a successful wait for
3585 * a foreground job which had at least one stopped or sigkilled member.
3586 * The probable rationale is that SIGSTOP and SIGKILL can preclude task from
3587 * properly restoring tty state. Should we do this too?
3588 * A reproducer: ^Z an interactive python:
3591 * Python 2.7.12 (...)
3593 * { python leaves tty in -icanon -echo state. We do survive that... }
3594 * [1]+ Stopped python
3595 * { ...however, next program (python #2) does not survive it well: }
3597 * Python 2.7.12 (...)
3598 * >>> Traceback (most recent call last):
3599 * { above, I typed "qwerty<CR>", but -echo state is still in effect }
3600 * File "<stdin>", line 1, in <module>
3601 * NameError: name 'qwerty' is not defined
3603 * The implementation below is modeled on bash code and seems to work.
3604 * However, I'm not sure we should do this. For one: what if I'd fg
3605 * the stopped python instead? It'll be confused by "restored" tty state.
3607 static struct termios shell_tty_info;
3611 if (rootshell && ttyfd >= 0)
3612 tcgetattr(ttyfd, &shell_tty_info);
3617 /* if (rootshell) - caller ensures this */
3619 tcsetattr(ttyfd, TCSADRAIN, &shell_tty_info);
3622 job_signal_status(struct job *jp)
3626 struct procstat *ps = jp->ps;
3627 for (i = 0; i < jp->nprocs; i++) {
3628 status = ps[i].ps_status;
3629 if (WIFSIGNALED(status) || WIFSTOPPED(status))
3635 restore_tty_if_stopped_or_signaled(struct job *jp)
3637 //TODO: check what happens if we come from waitforjob() in expbackq()
3639 int s = job_signal_status(jp);
3640 if (s) /* WIFSIGNALED(s) || WIFSTOPPED(s) */
3645 # define get_tty_state() ((void)0)
3646 # define restore_tty_if_stopped_or_signaled(jp) ((void)0)
3650 set_curjob(struct job *jp, unsigned mode)
3653 struct job **jpp, **curp;
3655 /* first remove from list */
3656 jpp = curp = &curjob;
3661 jpp = &jp1->prev_job;
3663 *jpp = jp1->prev_job;
3665 /* Then re-insert in correct position */
3673 /* job being deleted */
3676 /* newly created job or backgrounded job,
3677 * put after all stopped jobs.
3682 if (!jp1 || jp1->state != JOBSTOPPED)
3685 jpp = &jp1->prev_job;
3691 /* newly stopped job - becomes curjob */
3692 jp->prev_job = *jpp;
3700 jobno(const struct job *jp)
3702 return jp - jobtab + 1;
3707 * Convert a job name to a job structure.
3710 #define getjob(name, getctl) getjob(name)
3713 getjob(const char *name, int getctl)
3717 const char *err_msg = "%s: no such job";
3721 char *(*match)(const char *, const char *);
3736 if (c == '+' || c == '%') {
3738 err_msg = "No current job";
3744 err_msg = "No previous job";
3754 if (num > 0 && num <= njobs) {
3755 jp = jobtab + num - 1;
3770 if (match(jp->ps[0].ps_cmd, p)) {
3774 err_msg = "%s: ambiguous";
3784 err_msg = "job %s not created under job control";
3785 if (getctl && jp->jobctl == 0)
3790 ash_msg_and_raise_error(err_msg, name);
3794 * Mark a job structure as unused.
3797 freejob(struct job *jp)
3799 struct procstat *ps;
3803 for (i = jp->nprocs, ps = jp->ps; --i >= 0; ps++) {
3804 if (ps->ps_cmd != nullstr)
3807 if (jp->ps != &jp->ps0)
3810 set_curjob(jp, CUR_DELETE);
3816 xtcsetpgrp(int fd, pid_t pgrp)
3818 if (tcsetpgrp(fd, pgrp))
3819 ash_msg_and_raise_error("can't set tty process group (%m)");
3823 * Turn job control on and off.
3825 * Note: This code assumes that the third arg to ioctl is a character
3826 * pointer, which is true on Berkeley systems but not System V. Since
3827 * System V doesn't have job control yet, this isn't a problem now.
3829 * Called with interrupts off.
3837 if (on == doing_jobctl || rootshell == 0)
3841 ofd = fd = open(_PATH_TTY, O_RDWR);
3843 /* BTW, bash will try to open(ttyname(0)) if open("/dev/tty") fails.
3844 * That sometimes helps to acquire controlling tty.
3845 * Obviously, a workaround for bugs when someone
3846 * failed to provide a controlling tty to bash! :) */
3852 /* fd is a tty at this point */
3853 fd = fcntl(fd, F_DUPFD, 10);
3854 if (ofd >= 0) /* if it is "/dev/tty", close. If 0/1/2, dont */
3857 goto out; /* F_DUPFD failed */
3858 close_on_exec_on(fd);
3859 while (1) { /* while we are in the background */
3860 pgrp = tcgetpgrp(fd);
3863 ash_msg("can't access tty; job control turned off");
3867 if (pgrp == getpgrp())
3878 xtcsetpgrp(fd, pgrp);
3880 /* turning job control off */
3883 /* was xtcsetpgrp, but this can make exiting ash
3884 * loop forever if pty is already deleted */
3885 tcsetpgrp(fd, pgrp);
3899 static int FAST_FUNC
3900 killcmd(int argc, char **argv)
3902 if (argv[1] && strcmp(argv[1], "-l") != 0) {
3905 if (argv[i][0] == '%') {
3907 * "kill %N" - job kill
3908 * Converting to pgrp / pid kill
3914 jp = getjob(argv[i], 0);
3916 * In jobs started under job control, we signal
3917 * entire process group by kill -PGRP_ID.
3918 * This happens, f.e., in interactive shell.
3920 * Otherwise, we signal each child via
3921 * kill PID1 PID2 PID3.
3923 * sh -c 'sleep 1|sleep 1 & kill %1'
3924 * sh -c 'true|sleep 2 & sleep 1; kill %1'
3925 * sh -c 'true|sleep 1 & sleep 2; kill %1'
3927 n = jp->nprocs; /* can't be 0 (I hope) */
3930 dst = alloca(n * sizeof(int)*4);
3932 for (j = 0; j < n; j++) {
3933 struct procstat *ps = &jp->ps[j];
3934 /* Skip non-running and not-stopped members
3935 * (i.e. dead members) of the job
3937 if (ps->ps_status != -1 && !WIFSTOPPED(ps->ps_status))
3940 * kill_main has matching code to expect
3941 * leading space. Needed to not confuse
3942 * negative pids with "kill -SIGNAL_NO" syntax
3944 dst += sprintf(dst, jp->jobctl ? " -%u" : " %u", (int)ps->ps_pid);
3948 } while (argv[++i]);
3950 return kill_main(argc, argv);
3954 showpipe(struct job *jp /*, FILE *out*/)
3956 struct procstat *ps;
3957 struct procstat *psend;
3959 psend = jp->ps + jp->nprocs;
3960 for (ps = jp->ps + 1; ps < psend; ps++)
3961 printf(" | %s", ps->ps_cmd);
3962 newline_and_flush(stdout);
3963 flush_stdout_stderr();
3968 restartjob(struct job *jp, int mode)
3970 struct procstat *ps;
3976 if (jp->state == JOBDONE)
3978 jp->state = JOBRUNNING;
3979 pgid = jp->ps[0].ps_pid;
3980 if (mode == FORK_FG) {
3982 xtcsetpgrp(ttyfd, pgid);
3984 killpg(pgid, SIGCONT);
3988 if (WIFSTOPPED(ps->ps_status)) {
3994 status = (mode == FORK_FG) ? waitforjob(jp) : 0;
3999 static int FAST_FUNC
4000 fg_bgcmd(int argc UNUSED_PARAM, char **argv)
4006 mode = (**argv == 'f') ? FORK_FG : FORK_BG;
4010 jp = getjob(*argv, 1);
4011 if (mode == FORK_BG) {
4012 set_curjob(jp, CUR_RUNNING);
4013 printf("[%d] ", jobno(jp));
4015 out1str(jp->ps[0].ps_cmd);
4016 showpipe(jp /*, stdout*/);
4017 retval = restartjob(jp, mode);
4018 } while (*argv && *++argv);
4024 sprint_status48(char *s, int status, int sigonly)
4030 if (!WIFEXITED(status)) {
4031 if (JOBS && WIFSTOPPED(status))
4032 st = WSTOPSIG(status);
4034 st = WTERMSIG(status);
4036 if (st == SIGINT || st == SIGPIPE)
4038 if (JOBS && WIFSTOPPED(status))
4042 //TODO: use bbox's get_signame? strsignal adds ~600 bytes to text+rodata
4043 col = fmtstr(s, 32, strsignal(st));
4044 if (WCOREDUMP(status)) {
4045 strcpy(s + col, " (core dumped)");
4046 col += sizeof(" (core dumped)")-1;
4048 } else if (!sigonly) {
4049 st = WEXITSTATUS(status);
4050 col = fmtstr(s, 16, (st ? "Done(%d)" : "Done"), st);
4057 wait_block_or_sig(int *status)
4064 /* Poll all children for changes in their state */
4066 /* if job control is active, accept stopped processes too */
4067 pid = waitpid(-1, status, doing_jobctl ? (WNOHANG|WUNTRACED) : WNOHANG);
4069 break; /* Error (e.g. EINTR, ECHILD) or pid */
4071 /* Children exist, but none are ready. Sleep until interesting signal */
4074 sigprocmask(SIG_SETMASK, &mask, &mask);
4075 while (!got_sigchld && !pending_sig)
4077 sigprocmask(SIG_SETMASK, &mask, NULL);
4078 #else /* unsafe: a signal can set pending_sig after check, but before pause() */
4079 while (!got_sigchld && !pending_sig)
4083 /* If it was SIGCHLD, poll children again */
4084 } while (got_sigchld);
4089 #define DOWAIT_NONBLOCK 0
4090 #define DOWAIT_BLOCK 1
4091 #define DOWAIT_BLOCK_OR_SIG 2
4094 dowait(int block, struct job *job)
4099 struct job *thisjob = NULL;
4101 TRACE(("dowait(0x%x) called\n", block));
4103 /* It's wrong to call waitpid() outside of INT_OFF region:
4104 * signal can arrive just after syscall return and handler can
4105 * longjmp away, losing stop/exit notification processing.
4106 * Thus, for "jobs" builtin, and for waiting for a fg job,
4107 * we call waitpid() (blocking or non-blocking) inside INT_OFF.
4109 * However, for "wait" builtin it is wrong to simply call waitpid()
4110 * in INT_OFF region: "wait" needs to wait for any running job
4111 * to change state, but should exit on any trap too.
4112 * In INT_OFF region, a signal just before syscall entry can set
4113 * pending_sig variables, but we can't check them, and we would
4114 * either enter a sleeping waitpid() (BUG), or need to busy-loop.
4116 * Because of this, we run inside INT_OFF, but use a special routine
4117 * which combines waitpid() and sigsuspend().
4118 * This is the reason why we need to have a handler for SIGCHLD:
4119 * SIG_DFL handler does not wake sigsuspend().
4122 if (block == DOWAIT_BLOCK_OR_SIG) {
4123 pid = wait_block_or_sig(&status);
4126 if (block == DOWAIT_NONBLOCK)
4127 wait_flags = WNOHANG;
4128 /* if job control is active, accept stopped processes too */
4130 wait_flags |= WUNTRACED;
4131 /* NB: _not_ safe_waitpid, we need to detect EINTR */
4132 pid = waitpid(-1, &status, wait_flags);
4134 TRACE(("wait returns pid=%d, status=0x%x, errno=%d(%s)\n",
4135 pid, status, errno, strerror(errno)));
4140 for (jp = curjob; jp; jp = jp->prev_job) {
4142 struct procstat *ps;
4143 struct procstat *psend;
4144 if (jp->state == JOBDONE)
4148 psend = ps + jp->nprocs;
4150 if (ps->ps_pid == pid) {
4151 TRACE(("Job %d: changing status of proc %d "
4152 "from 0x%x to 0x%x\n",
4153 jobno(jp), pid, ps->ps_status, status));
4154 ps->ps_status = status;
4157 if (ps->ps_status == -1)
4158 jobstate = JOBRUNNING;
4160 if (jobstate == JOBRUNNING)
4162 if (WIFSTOPPED(ps->ps_status)) {
4163 jp->stopstatus = ps->ps_status;
4164 jobstate = JOBSTOPPED;
4167 } while (++ps < psend);
4171 /* Found the job where one of its processes changed its state.
4172 * Is there at least one live and running process in this job? */
4173 if (jobstate != JOBRUNNING) {
4174 /* No. All live processes in the job are stopped
4175 * (JOBSTOPPED) or there are no live processes (JOBDONE)
4177 thisjob->changed = 1;
4178 if (thisjob->state != jobstate) {
4179 TRACE(("Job %d: changing state from %d to %d\n",
4180 jobno(thisjob), thisjob->state, jobstate));
4181 thisjob->state = jobstate;
4183 if (jobstate == JOBSTOPPED)
4184 set_curjob(thisjob, CUR_STOPPED);
4190 /* The process wasn't found in job list */
4191 if (JOBS && !WIFSTOPPED(status))
4196 if (thisjob && thisjob == job) {
4200 len = sprint_status48(s, status, 1);
4212 showjob(struct job *jp, int mode)
4214 struct procstat *ps;
4215 struct procstat *psend;
4218 char s[16 + 16 + 48];
4219 FILE *out = (mode & SHOW_STDERR ? stderr : stdout);
4223 if (mode & SHOW_ONLY_PGID) { /* jobs -p */
4224 /* just output process (group) id of pipeline */
4225 fprintf(out, "%d\n", ps->ps_pid);
4229 col = fmtstr(s, 16, "[%d] ", jobno(jp));
4234 else if (curjob && jp == curjob->prev_job)
4237 if (mode & SHOW_PIDS)
4238 col += fmtstr(s + col, 16, "%d ", ps->ps_pid);
4240 psend = ps + jp->nprocs;
4242 if (jp->state == JOBRUNNING) {
4243 strcpy(s + col, "Running");
4244 col += sizeof("Running") - 1;
4246 int status = psend[-1].ps_status;
4247 if (jp->state == JOBSTOPPED)
4248 status = jp->stopstatus;
4249 col += sprint_status48(s + col, status, 0);
4251 /* By now, "[JOBID]* [maybe PID] STATUS" is printed */
4253 /* This loop either prints "<cmd1> | <cmd2> | <cmd3>" line
4254 * or prints several "PID | <cmdN>" lines,
4255 * depending on SHOW_PIDS bit.
4256 * We do not print status of individual processes
4257 * between PID and <cmdN>. bash does it, but not very well:
4258 * first line shows overall job status, not process status,
4259 * making it impossible to know 1st process status.
4263 /* for each process */
4266 if (mode & SHOW_PIDS)
4267 col = fmtstr(s, 48, "\n%*c%d ", indent_col, ' ', ps->ps_pid) - 1;
4269 fprintf(out, "%s%*c%s%s",
4271 33 - col >= 0 ? 33 - col : 0, ' ',
4272 ps == jp->ps ? "" : "| ",
4275 } while (++ps != psend);
4276 newline_and_flush(out);
4280 if (jp->state == JOBDONE) {
4281 TRACE(("showjob: freeing job %d\n", jobno(jp)));
4287 * Print a list of jobs. If "change" is nonzero, only print jobs whose
4288 * statuses have changed since the last call to showjobs.
4295 TRACE(("showjobs(0x%x) called\n", mode));
4297 /* Handle all finished jobs */
4298 while (dowait(DOWAIT_NONBLOCK, NULL) > 0)
4301 for (jp = curjob; jp; jp = jp->prev_job) {
4302 if (!(mode & SHOW_CHANGED) || jp->changed) {
4308 static int FAST_FUNC
4309 jobscmd(int argc UNUSED_PARAM, char **argv)
4314 while ((m = nextopt("lp")) != '\0') {
4318 mode |= SHOW_ONLY_PGID;
4324 showjob(getjob(*argv, 0), mode);
4334 /* Called only on finished or stopped jobs (no members are running) */
4336 getstatus(struct job *job)
4340 struct procstat *ps;
4342 /* Fetch last member's status */
4343 ps = job->ps + job->nprocs - 1;
4344 status = ps->ps_status;
4346 /* "set -o pipefail" mode: use last _nonzero_ status */
4347 while (status == 0 && --ps >= job->ps)
4348 status = ps->ps_status;
4351 retval = WEXITSTATUS(status);
4352 if (!WIFEXITED(status)) {
4354 retval = WSTOPSIG(status);
4355 if (!WIFSTOPPED(status))
4358 /* XXX: limits number of signals */
4359 retval = WTERMSIG(status);
4361 if (retval == SIGINT)
4367 TRACE(("getstatus: job %d, nproc %d, status 0x%x, retval 0x%x\n",
4368 jobno(job), job->nprocs, status, retval));
4372 static int FAST_FUNC
4373 waitcmd(int argc UNUSED_PARAM, char **argv)
4384 /* wait for all jobs */
4388 if (!jp) /* no running procs */
4390 if (jp->state == JOBRUNNING)
4396 * "When bash is waiting for an asynchronous command via
4397 * the wait builtin, the reception of a signal for which a trap
4398 * has been set will cause the wait builtin to return immediately
4399 * with an exit status greater than 128, immediately after which
4400 * the trap is executed."
4402 dowait(DOWAIT_BLOCK_OR_SIG, NULL);
4403 /* if child sends us a signal *and immediately exits*,
4404 * dowait() returns pid > 0. Check this case,
4405 * not "if (dowait() < 0)"!
4414 if (**argv != '%') {
4415 pid_t pid = number(*argv);
4420 if (job->ps[job->nprocs - 1].ps_pid == pid)
4422 job = job->prev_job;
4425 job = getjob(*argv, 0);
4427 /* loop until process terminated or stopped */
4428 while (job->state == JOBRUNNING) {
4429 dowait(DOWAIT_BLOCK_OR_SIG, NULL);
4434 retval = getstatus(job);
4441 retval = 128 + pending_sig;
4450 struct job *jp, *jq;
4452 len = njobs * sizeof(*jp);
4454 jp = ckrealloc(jq, len + 4 * sizeof(*jp));
4456 offset = (char *)jp - (char *)jq;
4458 /* Relocate pointers */
4461 jq = (struct job *)((char *)jq + l);
4465 #define joff(p) ((struct job *)((char *)(p) + l))
4466 #define jmove(p) (p) = (void *)((char *)(p) + offset)
4467 if (joff(jp)->ps == &jq->ps0)
4468 jmove(joff(jp)->ps);
4469 if (joff(jp)->prev_job)
4470 jmove(joff(jp)->prev_job);
4480 jp = (struct job *)((char *)jp + len);
4484 } while (--jq >= jp);
4489 * Return a new job structure.
4490 * Called with interrupts off.
4493 makejob(/*union node *node,*/ int nprocs)
4498 for (i = njobs, jp = jobtab; ; jp++) {
4505 if (jp->state != JOBDONE || !jp->waited)
4514 memset(jp, 0, sizeof(*jp));
4516 /* jp->jobctl is a bitfield.
4517 * "jp->jobctl |= doing_jobctl" likely to give awful code */
4521 jp->prev_job = curjob;
4526 jp->ps = ckmalloc(nprocs * sizeof(struct procstat));
4528 TRACE(("makejob(%d) returns %%%d\n", nprocs,
4535 * Return a string identifying a command (to be printed by the
4538 static char *cmdnextc;
4541 cmdputs(const char *s)
4543 static const char vstype[VSTYPE + 1][3] = {
4544 "", "}", "-", "+", "?", "=",
4545 "%", "%%", "#", "##"
4546 IF_BASH_SUBSTR(, ":")
4547 IF_BASH_PATTERN_SUBST(, "/", "//")
4550 const char *p, *str;
4554 unsigned char subtype = 0;
4558 nextc = makestrspace((strlen(s) + 1) * 8, cmdnextc);
4560 while ((c = *p++) != '\0') {
4568 if ((subtype & VSTYPE) == VSLENGTH)
4574 str = "\"}" + !(quoted & 1);
4581 #if ENABLE_FEATURE_SH_MATH
4596 if ((subtype & VSTYPE) != VSNORMAL)
4598 str = vstype[subtype & VSTYPE];
4599 if (subtype & VSNUL)
4608 /* These can only happen inside quotes */
4621 while ((c = *str++) != '\0') {
4624 } /* while *p++ not NUL */
4627 USTPUTC('"', nextc);
4633 /* cmdtxt() and cmdlist() call each other */
4634 static void cmdtxt(union node *n);
4637 cmdlist(union node *np, int sep)
4639 for (; np; np = np->narg.next) {
4643 if (sep && np->narg.next)
4649 cmdtxt(union node *n)
4652 struct nodelist *lp;
4663 lp = n->npipe.cmdlist;
4681 cmdtxt(n->nbinary.ch1);
4697 cmdtxt(n->nif.test);
4699 if (n->nif.elsepart) {
4700 cmdtxt(n->nif.ifpart);
4702 n = n->nif.elsepart;
4720 cmdtxt(n->nbinary.ch1);
4730 cmdputs(n->nfor.var);
4732 cmdlist(n->nfor.args, 1);
4737 cmdputs(n->narg.text);
4741 cmdlist(n->ncmd.args, 1);
4742 cmdlist(n->ncmd.redirect, 0);
4755 cmdputs(n->ncase.expr->narg.text);
4757 for (np = n->ncase.cases; np; np = np->nclist.next) {
4758 cmdtxt(np->nclist.pattern);
4760 cmdtxt(np->nclist.body);
4774 #if BASH_REDIR_OUTPUT
4789 cmdputs(utoa(n->nfile.fd));
4791 if (n->type == NTOFD || n->type == NFROMFD) {
4792 cmdputs(utoa(n->ndup.dupfd));
4801 commandtext(union node *n)
4805 STARTSTACKSTR(cmdnextc);
4807 name = stackblock();
4808 TRACE(("commandtext: name %p, end %p\n", name, cmdnextc));
4809 return ckstrdup(name);
4814 * Fork off a subshell. If we are doing job control, give the subshell its
4815 * own process group. Jp is a job structure that the job is to be added to.
4816 * N is the command that will be evaluated by the child. Both jp and n may
4817 * be NULL. The mode parameter can be one of the following:
4818 * FORK_FG - Fork off a foreground process.
4819 * FORK_BG - Fork off a background process.
4820 * FORK_NOJOB - Like FORK_FG, but don't give the process its own
4821 * process group even if job control is on.
4823 * When job control is turned off, background processes have their standard
4824 * input redirected to /dev/null (except for the second and later processes
4827 * Called with interrupts off.
4830 * Clear traps on a fork.
4838 for (tp = trap; tp < &trap[NSIG]; tp++) {
4839 if (*tp && **tp) { /* trap not NULL or "" (SIG_IGN) */
4840 if (trap_ptr == trap)
4842 /* else: it "belongs" to trap_ptr vector, don't free */
4844 if ((tp - trap) != 0)
4845 setsignal(tp - trap);
4852 /* Lives far away from here, needed for forkchild */
4853 static void closescript(void);
4855 /* Called after fork(), in child */
4856 /* jp and n are NULL when called by openhere() for heredoc support */
4857 static NOINLINE void
4858 forkchild(struct job *jp, union node *n, int mode)
4862 TRACE(("Child shell %d\n", getpid()));
4866 /* man bash: "Non-builtin commands run by bash have signal handlers
4867 * set to the values inherited by the shell from its parent".
4868 * Do we do it correctly? */
4872 if (mode == FORK_NOJOB /* is it `xxx` ? */
4873 && n && n->type == NCMD /* is it single cmd? */
4874 /* && n->ncmd.args->type == NARG - always true? */
4875 && n->ncmd.args && strcmp(n->ncmd.args->narg.text, "trap") == 0
4876 && n->ncmd.args->narg.next == NULL /* "trap" with no arguments */
4877 /* && n->ncmd.args->narg.backquote == NULL - do we need to check this? */
4879 TRACE(("Trap hack\n"));
4880 /* Awful hack for `trap` or $(trap).
4882 * http://www.opengroup.org/onlinepubs/009695399/utilities/trap.html
4883 * contains an example where "trap" is executed in a subshell:
4885 * save_traps=$(trap)
4887 * eval "$save_traps"
4889 * Standard does not say that "trap" in subshell shall print
4890 * parent shell's traps. It only says that its output
4891 * must have suitable form, but then, in the above example
4892 * (which is not supposed to be normative), it implies that.
4894 * bash (and probably other shell) does implement it
4895 * (traps are reset to defaults, but "trap" still shows them),
4896 * but as a result, "trap" logic is hopelessly messed up:
4899 * trap -- 'echo Ho' SIGWINCH <--- we have a handler
4900 * # (trap) <--- trap is in subshell - no output (correct, traps are reset)
4901 * # true | trap <--- trap is in subshell - no output (ditto)
4902 * # echo `true | trap` <--- in subshell - output (but traps are reset!)
4903 * trap -- 'echo Ho' SIGWINCH
4904 * # echo `(trap)` <--- in subshell in subshell - output
4905 * trap -- 'echo Ho' SIGWINCH
4906 * # echo `true | (trap)` <--- in subshell in subshell in subshell - output!
4907 * trap -- 'echo Ho' SIGWINCH
4909 * The rules when to forget and when to not forget traps
4910 * get really complex and nonsensical.
4912 * Our solution: ONLY bare $(trap) or `trap` is special.
4914 /* Save trap handler strings for trap builtin to print */
4915 trap_ptr = xmemdup(trap, sizeof(trap));
4916 /* Fall through into clearing traps */
4920 /* do job control only in root shell */
4922 if (mode != FORK_NOJOB && jp->jobctl && oldlvl == 0) {
4925 if (jp->nprocs == 0)
4928 pgrp = jp->ps[0].ps_pid;
4929 /* this can fail because we are doing it in the parent also */
4931 if (mode == FORK_FG)
4932 xtcsetpgrp(ttyfd, pgrp);
4937 if (mode == FORK_BG) {
4938 /* man bash: "When job control is not in effect,
4939 * asynchronous commands ignore SIGINT and SIGQUIT" */
4942 if (jp->nprocs == 0) {
4944 if (open(bb_dev_null, O_RDONLY) != 0)
4945 ash_msg_and_raise_error("can't open '%s'", bb_dev_null);
4949 if (iflag) { /* why if iflag only? */
4954 * "In all cases, bash ignores SIGQUIT. Non-builtin
4955 * commands run by bash have signal handlers
4956 * set to the values inherited by the shell
4958 * Take care of the second rule: */
4962 if (n && n->type == NCMD
4963 && n->ncmd.args && strcmp(n->ncmd.args->narg.text, "jobs") == 0
4965 TRACE(("Job hack\n"));
4966 /* "jobs": we do not want to clear job list for it,
4967 * instead we remove only _its_ own_ job from job list.
4968 * This makes "jobs .... | cat" more useful.
4974 for (jp = curjob; jp; jp = jp->prev_job)
4979 /* Called after fork(), in parent */
4981 #define forkparent(jp, n, mode, pid) forkparent(jp, mode, pid)
4984 forkparent(struct job *jp, union node *n, int mode, pid_t pid)
4986 TRACE(("In parent shell: child = %d\n", pid));
4988 /* jp is NULL when called by openhere() for heredoc support */
4989 while (jobless && dowait(DOWAIT_NONBLOCK, NULL) > 0)
4995 if (mode != FORK_NOJOB && jp->jobctl) {
4998 if (jp->nprocs == 0)
5001 pgrp = jp->ps[0].ps_pid;
5002 /* This can fail because we are doing it in the child also */
5006 if (mode == FORK_BG) {
5007 backgndpid = pid; /* set $! */
5008 set_curjob(jp, CUR_RUNNING);
5011 struct procstat *ps = &jp->ps[jp->nprocs++];
5014 ps->ps_cmd = nullstr;
5016 if (doing_jobctl && n)
5017 ps->ps_cmd = commandtext(n);
5022 /* jp and n are NULL when called by openhere() for heredoc support */
5024 forkshell(struct job *jp, union node *n, int mode)
5028 TRACE(("forkshell(%%%d, %p, %d) called\n", jobno(jp), n, mode));
5031 TRACE(("Fork failed, errno=%d", errno));
5034 ash_msg_and_raise_error("can't fork");
5037 CLEAR_RANDOM_T(&random_gen); /* or else $RANDOM repeats in child */
5038 forkchild(jp, n, mode);
5040 forkparent(jp, n, mode, pid);
5046 * Wait for job to finish.
5048 * Under job control we have the problem that while a child process
5049 * is running interrupts generated by the user are sent to the child
5050 * but not to the shell. This means that an infinite loop started by
5051 * an interactive user may be hard to kill. With job control turned off,
5052 * an interactive user may place an interactive program inside a loop.
5053 * If the interactive program catches interrupts, the user doesn't want
5054 * these interrupts to also abort the loop. The approach we take here
5055 * is to have the shell ignore interrupt signals while waiting for a
5056 * foreground process to terminate, and then send itself an interrupt
5057 * signal if the child process was terminated by an interrupt signal.
5058 * Unfortunately, some programs want to do a bit of cleanup and then
5059 * exit on interrupt; unless these processes terminate themselves by
5060 * sending a signal to themselves (instead of calling exit) they will
5061 * confuse this approach.
5063 * Called with interrupts off.
5066 waitforjob(struct job *jp)
5070 TRACE(("waitforjob(%%%d) called\n", jobno(jp)));
5073 while (jp->state == JOBRUNNING) {
5074 /* In non-interactive shells, we _can_ get
5075 * a keyboard signal here and be EINTRed,
5076 * but we just loop back, waiting for command to complete.
5079 * "If bash is waiting for a command to complete and receives
5080 * a signal for which a trap has been set, the trap
5081 * will not be executed until the command completes."
5083 * Reality is that even if trap is not set, bash
5084 * will not act on the signal until command completes.
5085 * Try this. sleep5intoff.c:
5086 * #include <signal.h>
5087 * #include <unistd.h>
5090 * sigemptyset(&set);
5091 * sigaddset(&set, SIGINT);
5092 * sigaddset(&set, SIGQUIT);
5093 * sigprocmask(SIG_BLOCK, &set, NULL);
5097 * $ bash -c './sleep5intoff; echo hi'
5098 * ^C^C^C^C <--- pressing ^C once a second
5100 * $ bash -c './sleep5intoff; echo hi'
5101 * ^\^\^\^\hi <--- pressing ^\ (SIGQUIT)
5104 dowait(DOWAIT_BLOCK, jp);
5111 xtcsetpgrp(ttyfd, rootpid);
5112 restore_tty_if_stopped_or_signaled(jp);
5115 * This is truly gross.
5116 * If we're doing job control, then we did a TIOCSPGRP which
5117 * caused us (the shell) to no longer be in the controlling
5118 * session -- so we wouldn't have seen any ^C/SIGINT. So, we
5119 * intuit from the subprocess exit status whether a SIGINT
5120 * occurred, and if so interrupt ourselves. Yuck. - mycroft
5122 if (jp->sigint) /* TODO: do the same with all signals */
5123 raise(SIGINT); /* ... by raise(jp->sig) instead? */
5125 if (jp->state == JOBDONE)
5132 * return 1 if there are stopped jobs, otherwise 0
5144 if (jp && jp->state == JOBSTOPPED) {
5145 out2str("You have stopped jobs.\n");
5155 * Code for dealing with input/output redirection.
5160 #define EMPTY -2 /* marks an unused slot in redirtab */
5161 #define CLOSED -3 /* marks a slot of previously-closed fd */
5164 * Open a file in noclobber mode.
5165 * The code was copied from bash.
5168 noclobberopen(const char *fname)
5171 struct stat finfo, finfo2;
5174 * If the file exists and is a regular file, return an error
5177 r = stat(fname, &finfo);
5178 if (r == 0 && S_ISREG(finfo.st_mode)) {
5184 * If the file was not present (r != 0), make sure we open it
5185 * exclusively so that if it is created before we open it, our open
5186 * will fail. Make sure that we do not truncate an existing file.
5187 * Note that we don't turn on O_EXCL unless the stat failed -- if the
5188 * file was not a regular file, we leave O_EXCL off.
5191 return open(fname, O_WRONLY|O_CREAT|O_EXCL, 0666);
5192 fd = open(fname, O_WRONLY|O_CREAT, 0666);
5194 /* If the open failed, return the file descriptor right away. */
5199 * OK, the open succeeded, but the file may have been changed from a
5200 * non-regular file to a regular file between the stat and the open.
5201 * We are assuming that the O_EXCL open handles the case where FILENAME
5202 * did not exist and is symlinked to an existing file between the stat
5207 * If we can open it and fstat the file descriptor, and neither check
5208 * revealed that it was a regular file, and the file has not been
5209 * replaced, return the file descriptor.
5211 if (fstat(fd, &finfo2) == 0
5212 && !S_ISREG(finfo2.st_mode)
5213 && finfo.st_dev == finfo2.st_dev
5214 && finfo.st_ino == finfo2.st_ino
5219 /* The file has been replaced. badness. */
5226 * Handle here documents. Normally we fork off a process to write the
5227 * data to a pipe. If the document is short, we can stuff the data in
5228 * the pipe without forking.
5230 /* openhere needs this forward reference */
5231 static void expandhere(union node *arg, int fd);
5233 openhere(union node *redir)
5239 ash_msg_and_raise_error("pipe call failed");
5240 if (redir->type == NHERE) {
5241 len = strlen(redir->nhere.doc->narg.text);
5242 if (len <= PIPE_BUF) {
5243 full_write(pip[1], redir->nhere.doc->narg.text, len);
5247 if (forkshell((struct job *)NULL, (union node *)NULL, FORK_NOJOB) == 0) {
5250 ignoresig(SIGINT); //signal(SIGINT, SIG_IGN);
5251 ignoresig(SIGQUIT); //signal(SIGQUIT, SIG_IGN);
5252 ignoresig(SIGHUP); //signal(SIGHUP, SIG_IGN);
5253 ignoresig(SIGTSTP); //signal(SIGTSTP, SIG_IGN);
5254 signal(SIGPIPE, SIG_DFL);
5255 if (redir->type == NHERE)
5256 full_write(pip[1], redir->nhere.doc->narg.text, len);
5258 expandhere(redir->nhere.doc, pip[1]);
5259 _exit(EXIT_SUCCESS);
5267 openredirect(union node *redir)
5272 switch (redir->nfile.type) {
5273 /* Can't happen, our single caller does this itself */
5279 return openhere(redir);
5282 /* For N[X]HERE, reading redir->nfile.expfname would touch beyond
5283 * allocated space. Do it only when we know it is safe.
5285 fname = redir->nfile.expfname;
5287 switch (redir->nfile.type) {
5293 f = open(fname, O_RDONLY);
5298 f = open(fname, O_RDWR|O_CREAT, 0666);
5303 #if BASH_REDIR_OUTPUT
5306 /* Take care of noclobber mode. */
5308 f = noclobberopen(fname);
5315 f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666);
5320 f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666);
5328 ash_msg_and_raise_error("can't create %s: %s", fname, errmsg(errno, "nonexistent directory"));
5330 ash_msg_and_raise_error("can't open %s: %s", fname, errmsg(errno, "no such file"));
5334 * Copy a file descriptor to be >= 10. Throws exception on error.
5342 newfd = fcntl(from, F_DUPFD, 10);
5343 err = newfd < 0 ? errno : 0;
5346 ash_msg_and_raise_error("%d: %m", from);
5348 fcntl(newfd, F_SETFD, FD_CLOEXEC);
5354 dup2_or_raise(int from, int to)
5358 newfd = (from != to) ? dup2(from, to) : to;
5360 /* Happens when source fd is not open: try "echo >&99" */
5361 ash_msg_and_raise_error("%d: %m", from);
5366 /* Struct def and variable are moved down to the first usage site */
5371 struct redirtab *next;
5373 struct two_fd_t two_fd[];
5375 #define redirlist (G_var.redirlist)
5377 COPYFD_RESTORE = (int)~(INT_MAX),
5381 need_to_remember(struct redirtab *rp, int fd)
5385 if (!rp) /* remembering was not requested */
5388 for (i = 0; i < rp->pair_count; i++) {
5389 if (rp->two_fd[i].orig == fd) {
5390 /* already remembered */
5397 /* "hidden" fd is a fd used to read scripts, or a copy of such */
5399 is_hidden_fd(struct redirtab *rp, int fd)
5402 struct parsefile *pf;
5406 /* Check open scripts' fds */
5409 /* We skip pf_fd == 0 case because of the following case:
5410 * $ ash # running ash interactively
5412 * and in script.sh: "exec 9>&0".
5413 * Even though top-level pf_fd _is_ 0,
5414 * it's still ok to use it: "read" builtin uses it,
5415 * why should we cripple "exec" builtin?
5417 if (pf->pf_fd > 0 && fd == pf->pf_fd) {
5425 /* Check saved fds of redirects */
5426 fd |= COPYFD_RESTORE;
5427 for (i = 0; i < rp->pair_count; i++) {
5428 if (rp->two_fd[i].copy == fd) {
5436 * Process a list of redirection commands. If the REDIR_PUSH flag is set,
5437 * old file descriptors are stashed away so that the redirection can be
5438 * undone by calling popredir.
5440 /* flags passed to redirect */
5441 #define REDIR_PUSH 01 /* save previous values of file descriptors */
5442 #define REDIR_SAVEFD2 03 /* set preverrout */
5444 redirect(union node *redir, int flags)
5446 struct redirtab *sv;
5451 int copied_fd2 = -1;
5460 if (flags & REDIR_PUSH) {
5461 union node *tmp = redir;
5464 #if BASH_REDIR_OUTPUT
5465 if (tmp->nfile.type == NTO2)
5468 tmp = tmp->nfile.next;
5470 sv = ckmalloc(sizeof(*sv) + sv_pos * sizeof(sv->two_fd[0]));
5471 sv->next = redirlist;
5472 sv->pair_count = sv_pos;
5474 while (sv_pos > 0) {
5476 sv->two_fd[sv_pos].orig = sv->two_fd[sv_pos].copy = EMPTY;
5482 fd = redir->nfile.fd;
5483 if (redir->nfile.type == NTOFD || redir->nfile.type == NFROMFD) {
5484 right_fd = redir->ndup.dupfd;
5485 //bb_error_msg("doing %d > %d", fd, right_fd);
5486 /* redirect from/to same file descriptor? */
5489 /* "echo >&10" and 10 is a fd opened to a sh script? */
5490 if (is_hidden_fd(sv, right_fd)) {
5491 errno = EBADF; /* as if it is closed */
5492 ash_msg_and_raise_error("%d: %m", right_fd);
5496 newfd = openredirect(redir); /* always >= 0 */
5498 /* Descriptor wasn't open before redirect.
5499 * Mark it for close in the future */
5500 if (need_to_remember(sv, fd)) {
5501 goto remember_to_close;
5506 #if BASH_REDIR_OUTPUT
5509 if (need_to_remember(sv, fd)) {
5510 /* Copy old descriptor */
5511 /* Careful to not accidentally "save"
5512 * to the same fd as right side fd in N>&M */
5513 int minfd = right_fd < 10 ? 10 : right_fd + 1;
5514 #if defined(F_DUPFD_CLOEXEC)
5515 i = fcntl(fd, F_DUPFD_CLOEXEC, minfd);
5517 i = fcntl(fd, F_DUPFD, minfd);
5522 /* Strange error (e.g. "too many files" EMFILE?) */
5526 ash_msg_and_raise_error("%d: %m", fd);
5529 /* EBADF: it is not open - good, remember to close it */
5532 } else { /* fd is open, save its copy */
5533 #if !defined(F_DUPFD_CLOEXEC)
5534 fcntl(i, F_SETFD, FD_CLOEXEC);
5536 /* "exec fd>&-" should not close fds
5537 * which point to script file(s).
5538 * Force them to be restored afterwards */
5539 if (is_hidden_fd(sv, fd))
5540 i |= COPYFD_RESTORE;
5544 sv->two_fd[sv_pos].orig = fd;
5545 sv->two_fd[sv_pos].copy = i;
5549 /* NTOFD/NFROMFD: copy redir->ndup.dupfd to fd */
5550 if (redir->ndup.dupfd < 0) { /* "fd>&-" */
5551 /* Don't want to trigger debugging */
5555 dup2_or_raise(redir->ndup.dupfd, fd);
5557 } else if (fd != newfd) { /* move newfd to fd */
5558 dup2_or_raise(newfd, fd);
5559 #if BASH_REDIR_OUTPUT
5560 if (!(redir->nfile.type == NTO2 && fd == 2))
5564 #if BASH_REDIR_OUTPUT
5565 if (redir->nfile.type == NTO2 && fd == 1) {
5566 /* We already redirected it to fd 1, now copy it to 2 */
5572 } while ((redir = redir->nfile.next) != NULL);
5575 if ((flags & REDIR_SAVEFD2) && copied_fd2 >= 0)
5576 preverrout_fd = copied_fd2;
5580 * Undo the effects of the last redirection.
5583 popredir(int drop, int restore)
5585 struct redirtab *rp;
5588 if (redirlist == NULL)
5592 for (i = 0; i < rp->pair_count; i++) {
5593 int fd = rp->two_fd[i].orig;
5594 int copy = rp->two_fd[i].copy;
5595 if (copy == CLOSED) {
5600 if (copy != EMPTY) {
5601 if (!drop || (restore && (copy & COPYFD_RESTORE))) {
5602 copy &= ~COPYFD_RESTORE;
5604 dup2_or_raise(copy, fd);
5606 close(copy & ~COPYFD_RESTORE);
5609 redirlist = rp->next;
5615 * Undo all redirections. Called on error or interrupt.
5619 redirectsafe(union node *redir, int flags)
5622 volatile int saveint;
5623 struct jmploc *volatile savehandler = exception_handler;
5624 struct jmploc jmploc;
5627 /* "echo 9>/dev/null; echo >&9; echo result: $?" - result should be 1, not 2! */
5628 err = setjmp(jmploc.loc); // huh?? was = setjmp(jmploc.loc) * 2;
5630 exception_handler = &jmploc;
5631 redirect(redir, flags);
5633 exception_handler = savehandler;
5634 if (err && exception_type != EXERROR)
5635 longjmp(exception_handler->loc, 1);
5636 RESTORE_INT(saveint);
5641 /* ============ Routines to expand arguments to commands
5643 * We have to deal with backquotes, shell variables, and file metacharacters.
5646 #if ENABLE_FEATURE_SH_MATH
5648 ash_arith(const char *s)
5650 arith_state_t math_state;
5653 math_state.lookupvar = lookupvar;
5654 math_state.setvar = setvar0;
5655 //math_state.endofname = endofname;
5658 result = arith(&math_state, s);
5659 if (math_state.errmsg)
5660 ash_msg_and_raise_error(math_state.errmsg);
5670 #define EXP_FULL 0x1 /* perform word splitting & file globbing */
5671 #define EXP_TILDE 0x2 /* do normal tilde expansion */
5672 #define EXP_VARTILDE 0x4 /* expand tildes in an assignment */
5673 #define EXP_REDIR 0x8 /* file glob for a redirection (1 match only) */
5674 /* ^^^^^^^^^^^^^^ this is meant to support constructs such as "cmd >file*.txt"
5675 * POSIX says for this case:
5676 * Pathname expansion shall not be performed on the word by a
5677 * non-interactive shell; an interactive shell may perform it, but shall
5678 * do so only when the expansion would result in one word.
5679 * Currently, our code complies to the above rule by never globbing
5680 * redirection filenames.
5681 * Bash performs globbing, unless it is non-interactive and in POSIX mode.
5682 * (this means that on a typical Linux distro, bash almost always
5683 * performs globbing, and thus diverges from what we do).
5685 #define EXP_CASE 0x10 /* keeps quotes around for CASE pattern */
5686 #define EXP_QPAT 0x20 /* pattern in quoted parameter expansion */
5687 #define EXP_VARTILDE2 0x40 /* expand tildes after colons only */
5688 #define EXP_WORD 0x80 /* expand word in parameter expansion */
5689 #define EXP_QUOTED 0x100 /* expand word in double quotes */
5693 #define RMESCAPE_ALLOC 0x1 /* Allocate a new string */
5694 #define RMESCAPE_GLOB 0x2 /* Add backslashes for glob */
5695 #define RMESCAPE_GROW 0x8 /* Grow strings instead of stalloc */
5696 #define RMESCAPE_HEAP 0x10 /* Malloc strings instead of stalloc */
5697 #define RMESCAPE_SLASH 0x20 /* Stop globbing after slash */
5699 /* Add CTLESC when necessary. */
5700 #define QUOTES_ESC (EXP_FULL | EXP_CASE | EXP_QPAT | EXP_REDIR)
5701 /* Do not skip NUL characters. */
5702 #define QUOTES_KEEPNUL EXP_TILDE
5705 * Structure specifying which parts of the string should be searched
5706 * for IFS characters.
5709 struct ifsregion *next; /* next region in list */
5710 int begoff; /* offset of start of region */
5711 int endoff; /* offset of end of region */
5712 int nulonly; /* search for nul bytes only */
5716 struct strlist *list;
5717 struct strlist **lastp;
5720 /* output of current string */
5721 static char *expdest;
5722 /* list of back quote expressions */
5723 static struct nodelist *argbackq;
5724 /* first struct in list of ifs regions */
5725 static struct ifsregion ifsfirst;
5726 /* last struct in list */
5727 static struct ifsregion *ifslastp;
5728 /* holds expanded arg list */
5729 static struct arglist exparg;
5734 #if !ENABLE_FEATURE_SH_MATH
5735 /* cvtnum() is used even if math support is off (to prepare $? values and such) */
5736 typedef long arith_t;
5737 # define ARITH_FMT "%ld"
5744 expdest = makestrspace(sizeof(arith_t)*3 + 2, expdest);
5745 len = fmtstr(expdest, sizeof(arith_t)*3 + 2, ARITH_FMT, num);
5746 STADJUST(len, expdest);
5751 * Break the argument string into pieces based upon IFS and add the
5752 * strings to the argument list. The regions of the string to be
5753 * searched for IFS characters have been stored by recordregion.
5756 ifsbreakup(char *string, struct arglist *arglist)
5758 struct ifsregion *ifsp;
5763 const char *ifs, *realifs;
5768 if (ifslastp != NULL) {
5771 realifs = ifsset() ? ifsval() : defifs;
5774 p = string + ifsp->begoff;
5775 nulonly = ifsp->nulonly;
5776 ifs = nulonly ? nullstr : realifs;
5778 while (p < string + ifsp->endoff) {
5780 if ((unsigned char)*p == CTLESC)
5782 if (!strchr(ifs, *p)) {
5787 ifsspc = (strchr(defifs, *p) != NULL);
5788 /* Ignore IFS whitespace at start */
5789 if (q == start && ifsspc) {
5795 sp = stzalloc(sizeof(*sp));
5797 *arglist->lastp = sp;
5798 arglist->lastp = &sp->next;
5802 if (p >= string + ifsp->endoff) {
5806 if ((unsigned char)*p == CTLESC)
5808 if (strchr(ifs, *p) == NULL) {
5812 if (strchr(defifs, *p) == NULL) {
5827 } while (ifsp != NULL);
5836 sp = stzalloc(sizeof(*sp));
5838 *arglist->lastp = sp;
5839 arglist->lastp = &sp->next;
5845 struct ifsregion *p = ifsfirst.next;
5852 struct ifsregion *ifsp;
5857 ifsfirst.next = NULL;
5864 esclen(const char *start, const char *p)
5868 while (p > start && (unsigned char)*--p == CTLESC) {
5875 * Remove any CTLESC characters from a string.
5878 rmescapes(char *str, int flag)
5880 static const char qchars[] ALIGN1 = {
5881 IF_BASH_PATTERN_SUBST('/',) CTLESC, CTLQUOTEMARK, '\0' };
5885 unsigned protect_against_glob;
5887 IF_BASH_PATTERN_SUBST(unsigned slash = flag & RMESCAPE_SLASH;)
5889 p = strpbrk(str, qchars IF_BASH_PATTERN_SUBST(+ !slash));
5895 if (flag & RMESCAPE_ALLOC) {
5896 size_t len = p - str;
5897 size_t fulllen = len + strlen(p) + 1;
5899 if (flag & RMESCAPE_GROW) {
5900 int strloc = str - (char *)stackblock();
5901 r = makestrspace(fulllen, expdest);
5902 /* p and str may be invalidated by makestrspace */
5903 str = (char *)stackblock() + strloc;
5905 } else if (flag & RMESCAPE_HEAP) {
5906 r = ckmalloc(fulllen);
5908 r = stalloc(fulllen);
5912 q = (char *)memcpy(q, str, len) + len;
5917 globbing = flag & RMESCAPE_GLOB;
5918 protect_against_glob = globbing;
5920 if ((unsigned char)*p == CTLQUOTEMARK) {
5921 // Note: both inquotes and protect_against_glob only affect whether
5922 inquotes = ~inquotes;
5924 protect_against_glob = globbing;
5927 if ((unsigned char)*p == CTLESC) {
5931 ash_msg_and_raise_error("CTLESC at EOL (shouldn't happen)");
5933 if (protect_against_glob) {
5936 } else if (*p == '\\' && !inquotes) {
5937 /* naked back slash */
5938 protect_against_glob = 0;
5941 #if BASH_PATTERN_SUBST
5942 else if (*p == '/' && slash) {
5943 /* stop handling globbing and mark location of slash */
5944 globbing = slash = 0;
5948 protect_against_glob = globbing;
5953 if (flag & RMESCAPE_GROW) {
5955 STADJUST(q - r + 1, expdest);
5959 #define pmatch(a, b) !fnmatch((a), (b), 0)
5962 * Prepare a pattern for a expmeta (internal glob(3)) call.
5964 * Returns an stalloced string.
5967 preglob(const char *pattern, int flag)
5969 return rmescapes((char *)pattern, flag | RMESCAPE_GLOB);
5973 * Put a string on the stack.
5976 memtodest(const char *p, size_t len, int syntax, int quotes)
5983 q = makestrspace((quotes & QUOTES_ESC) ? len * 2 : len, expdest);
5986 unsigned char c = *p++;
5988 if (quotes & QUOTES_ESC) {
5989 int n = SIT(c, syntax);
5991 || (((quotes & EXP_FULL) || syntax != BASESYNTAX)
5998 } else if (!(quotes & QUOTES_KEEPNUL))
6007 strtodest(const char *p, int syntax, int quotes)
6009 size_t len = strlen(p);
6010 memtodest(p, len, syntax, quotes);
6015 * Record the fact that we have to scan this region of the
6016 * string for IFS characters.
6019 recordregion(int start, int end, int nulonly)
6021 struct ifsregion *ifsp;
6023 if (ifslastp == NULL) {
6027 ifsp = ckzalloc(sizeof(*ifsp));
6028 /*ifsp->next = NULL; - ckzalloc did it */
6029 ifslastp->next = ifsp;
6033 ifslastp->begoff = start;
6034 ifslastp->endoff = end;
6035 ifslastp->nulonly = nulonly;
6039 removerecordregions(int endoff)
6041 if (ifslastp == NULL)
6044 if (ifsfirst.endoff > endoff) {
6045 while (ifsfirst.next) {
6046 struct ifsregion *ifsp;
6048 ifsp = ifsfirst.next->next;
6049 free(ifsfirst.next);
6050 ifsfirst.next = ifsp;
6053 if (ifsfirst.begoff > endoff) {
6056 ifslastp = &ifsfirst;
6057 ifsfirst.endoff = endoff;
6062 ifslastp = &ifsfirst;
6063 while (ifslastp->next && ifslastp->next->begoff < endoff)
6064 ifslastp = ifslastp->next;
6065 while (ifslastp->next) {
6066 struct ifsregion *ifsp;
6068 ifsp = ifslastp->next->next;
6069 free(ifslastp->next);
6070 ifslastp->next = ifsp;
6073 if (ifslastp->endoff > endoff)
6074 ifslastp->endoff = endoff;
6078 exptilde(char *startp, char *p, int flags)
6084 int quotes = flags & QUOTES_ESC;
6088 while ((c = *++p) != '\0') {
6095 if (flags & EXP_VARTILDE)
6105 if (*name == '\0') {
6106 home = lookupvar("HOME");
6108 pw = getpwnam(name);
6113 if (!home || !*home)
6116 strtodest(home, SQSYNTAX, quotes);
6124 * Execute a command inside back quotes. If it's a builtin command, we
6125 * want to save its output in a block obtained from malloc. Otherwise
6126 * we fork off a subprocess and get the output of the command via a pipe.
6127 * Should be called with interrupts off.
6129 struct backcmd { /* result of evalbackcmd */
6130 int fd; /* file descriptor to read from */
6131 int nleft; /* number of chars in buffer */
6132 char *buf; /* buffer */
6133 struct job *jp; /* job structure for command */
6136 /* These forward decls are needed to use "eval" code for backticks handling: */
6137 #define EV_EXIT 01 /* exit after evaluating tree */
6138 static int evaltree(union node *, int);
6140 static void FAST_FUNC
6141 evalbackcmd(union node *n, struct backcmd *result)
6155 ash_msg_and_raise_error("pipe call failed");
6156 jp = makejob(/*n,*/ 1);
6157 if (forkshell(jp, n, FORK_NOJOB) == 0) {
6163 dup2_or_raise(pip[1], 1);
6166 /* TODO: eflag clearing makes the following not abort:
6167 * ash -c 'set -e; z=$(false;echo foo); echo $z'
6168 * which is what bash does (unless it is in POSIX mode).
6169 * dash deleted "eflag = 0" line in the commit
6170 * Date: Mon, 28 Jun 2010 17:11:58 +1000
6171 * [EVAL] Don't clear eflag in evalbackcmd
6172 * For now, preserve bash-like behavior, it seems to be somewhat more useful:
6176 evaltree(n, EV_EXIT); /* actually evaltreenr... */
6181 result->fd = pip[0];
6185 TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n",
6186 result->fd, result->buf, result->nleft, result->jp));
6190 * Expand stuff in backwards quotes.
6193 expbackq(union node *cmd, int flag)
6201 int syntax = flag & EXP_QUOTED ? DQSYNTAX : BASESYNTAX;
6202 struct stackmark smark;
6205 startloc = expdest - (char *)stackblock();
6206 pushstackmark(&smark, startloc);
6207 evalbackcmd(cmd, &in);
6208 popstackmark(&smark);
6215 memtodest(p, i, syntax, flag & QUOTES_ESC);
6219 i = nonblock_immune_read(in.fd, buf, sizeof(buf));
6220 TRACE(("expbackq: read returns %d\n", i));
6229 back_exitstatus = waitforjob(in.jp);
6233 /* Eat all trailing newlines */
6235 for (; dest > (char *)stackblock() && dest[-1] == '\n';)
6239 if (!(flag & EXP_QUOTED))
6240 recordregion(startloc, dest - (char *)stackblock(), 0);
6241 TRACE(("evalbackq: size:%d:'%.*s'\n",
6242 (int)((dest - (char *)stackblock()) - startloc),
6243 (int)((dest - (char *)stackblock()) - startloc),
6244 stackblock() + startloc));
6247 #if ENABLE_FEATURE_SH_MATH
6249 * Expand arithmetic expression. Backup to start of expression,
6250 * evaluate, place result in (backed up) result, adjust string position.
6262 * This routine is slightly over-complicated for
6263 * efficiency. Next we scan backwards looking for the
6264 * start of arithmetic.
6266 start = stackblock();
6273 while ((unsigned char)*p != CTLARI) {
6277 ash_msg_and_raise_error("missing CTLARI (shouldn't happen)");
6282 esc = esclen(start, p);
6292 removerecordregions(begoff);
6296 if (flag & QUOTES_ESC)
6297 rmescapes(p + 1, 0);
6299 len = cvtnum(ash_arith(p + 1));
6301 if (!(flag & EXP_QUOTED))
6302 recordregion(begoff, begoff + len, 0);
6306 /* argstr needs it */
6307 static char *evalvar(char *p, int flags, struct strlist *var_str_list);
6310 * Perform variable and command substitution. If EXP_FULL is set, output CTLESC
6311 * characters to allow for further processing. Otherwise treat
6312 * $@ like $* since no splitting will be performed.
6314 * var_str_list (can be NULL) is a list of "VAR=val" strings which take precedence
6315 * over shell varables. Needed for "A=a B=$A; echo $B" case - we use it
6316 * for correct expansion of "B=$A" word.
6319 argstr(char *p, int flags, struct strlist *var_str_list)
6321 static const char spclchars[] ALIGN1 = {
6329 #if ENABLE_FEATURE_SH_MATH
6334 const char *reject = spclchars;
6335 int breakall = (flags & (EXP_WORD | EXP_QUOTED)) == EXP_WORD;
6340 if (!(flags & EXP_VARTILDE)) {
6342 } else if (flags & EXP_VARTILDE2) {
6347 if (flags & EXP_TILDE) {
6350 flags &= ~EXP_TILDE;
6354 p = exptilde(p, q, flags);
6357 startloc = expdest - (char *)stackblock();
6361 length += strcspn(p + length, reject);
6365 IF_FEATURE_SH_MATH(|| c == CTLENDARI)
6367 /* c == '=' || c == ':' || c == CTLENDARI */
6373 expdest = stack_nputstr(p, length, expdest);
6374 newloc = expdest - (char *)stackblock();
6375 if (breakall && !inquotes && newloc > startloc) {
6376 recordregion(startloc, newloc, 0);
6387 if (flags & EXP_VARTILDE2) {
6391 flags |= EXP_VARTILDE2;
6396 * sort of a hack - expand tildes in variable
6397 * assignments (after the first '=' and after ':'s).
6406 case CTLENDVAR: /* ??? */
6409 inquotes ^= EXP_QUOTED;
6410 /* "$@" syntax adherence hack */
6411 if (inquotes && !memcmp(p, dolatstr + 1, DOLATSTRLEN - 1)) {
6412 p = evalvar(p + 1, flags | inquotes, /* var_str_list: */ NULL) + 1;
6416 if (flags & QUOTES_ESC) {
6427 * Quoted parameter expansion pattern: remove quote
6428 * unless inside inner quotes or we have a literal
6431 if (((flags | inquotes) & (EXP_QPAT | EXP_QUOTED)) ==
6432 EXP_QPAT && *p != '\\')
6437 TRACE(("argstr: evalvar('%s')\n", p));
6438 p = evalvar(p, flags | inquotes, var_str_list);
6439 TRACE(("argstr: evalvar:'%s'\n", (char *)stackblock()));
6442 expbackq(argbackq->n, flags | inquotes);
6443 argbackq = argbackq->next;
6445 #if ENABLE_FEATURE_SH_MATH
6448 expari(flags | inquotes);
6457 scanleft(char *startp, char *rmesc, char *rmescend UNUSED_PARAM,
6458 char *pattern, int quotes, int zero)
6467 const char *s = loc2;
6474 match = pmatch(pattern, s);
6479 if (quotes && (unsigned char)*loc == CTLESC)
6488 scanright(char *startp, char *rmesc, char *rmescend,
6489 char *pattern, int quotes, int match_at_start)
6491 #if !ENABLE_ASH_OPTIMIZE_FOR_SIZE
6492 int try2optimize = match_at_start;
6498 /* If we called by "${v/pattern/repl}" or "${v//pattern/repl}":
6499 * startp="escaped_value_of_v" rmesc="raw_value_of_v"
6500 * rmescend=""(ptr to NUL in rmesc) pattern="pattern" quotes=match_at_start=1
6502 * loc starts at NUL at the end of startp, loc2 starts at the end of rmesc,
6503 * and on each iteration they go back two/one char until they reach the beginning.
6504 * We try to find a match in "raw_value_of_v", "raw_value_of_", "raw_value_of" etc.
6506 /* TODO: document in what other circumstances we are called. */
6508 for (loc = pattern - 1, loc2 = rmescend; loc >= startp; loc2--) {
6511 const char *s = loc2;
6512 if (match_at_start) {
6516 match = pmatch(pattern, s);
6517 //bb_error_msg("pmatch(pattern:'%s',s:'%s'):%d", pattern, s, match);
6521 #if !ENABLE_ASH_OPTIMIZE_FOR_SIZE
6523 /* Maybe we can optimize this:
6524 * if pattern ends with unescaped *, we can avoid checking
6525 * shorter strings: if "foo*" doesnt match "raw_value_of_v",
6526 * it wont match truncated "raw_value_of_" strings too.
6528 unsigned plen = strlen(pattern);
6529 /* Does it end with "*"? */
6530 if (plen != 0 && pattern[--plen] == '*') {
6531 /* "xxxx*" is not escaped */
6532 /* "xxx\*" is escaped */
6533 /* "xx\\*" is not escaped */
6534 /* "x\\\*" is escaped */
6536 while (plen != 0 && pattern[--plen] == '\\')
6539 break; /* ends with unescaped "*" */
6547 esc = esclen(startp, loc);
6558 static void varunset(const char *, const char *, const char *, int) NORETURN;
6560 varunset(const char *end, const char *var, const char *umsg, int varflags)
6566 msg = "parameter not set";
6568 if ((unsigned char)*end == CTLENDVAR) {
6569 if (varflags & VSNUL)
6575 ash_msg_and_raise_error("%.*s: %s%s", (int)(end - var - 1), var, msg, tail);
6579 subevalvar(char *p, char *varname, int strloc, int subtype,
6580 int startloc, int varflags, int flag, struct strlist *var_str_list)
6582 struct nodelist *saveargbackq = argbackq;
6583 int quotes = flag & QUOTES_ESC;
6586 char *rmesc, *rmescend;
6588 IF_BASH_SUBSTR(int pos, len, orig_len;)
6589 int amount, resetloc;
6590 IF_BASH_PATTERN_SUBST(int workloc;)
6591 IF_BASH_PATTERN_SUBST(char *repl = NULL;)
6593 char *(*scan)(char*, char*, char*, char*, int, int);
6595 //bb_error_msg("subevalvar(p:'%s',varname:'%s',strloc:%d,subtype:%d,startloc:%d,varflags:%x,quotes:%d)",
6596 // p, varname, strloc, subtype, startloc, varflags, quotes);
6598 argstr(p, EXP_TILDE | (subtype != VSASSIGN && subtype != VSQUESTION ?
6599 (flag & (EXP_QUOTED | EXP_QPAT) ? EXP_QPAT : EXP_CASE) : 0),
6601 STPUTC('\0', expdest);
6602 argbackq = saveargbackq;
6603 startp = (char *)stackblock() + startloc;
6607 setvar0(varname, startp);
6608 amount = startp - expdest;
6609 STADJUST(amount, expdest);
6613 varunset(p, varname, startp, varflags);
6618 //TODO: support more general format ${v:EXPR:EXPR},
6619 // where EXPR follows $(()) rules
6620 loc = str = stackblock() + strloc;
6621 /* Read POS in ${var:POS:LEN} */
6622 pos = atoi(loc); /* number(loc) errors out on "1:4" */
6623 len = str - startp - 1;
6625 /* *loc != '\0', guaranteed by parser */
6629 /* Adjust the length by the number of escapes */
6630 for (ptr = startp; ptr < (str - 1); ptr++) {
6631 if ((unsigned char)*ptr == CTLESC) {
6639 if (*loc++ == ':') {
6643 /* Skip POS in ${var:POS:LEN} */
6645 while (*loc && *loc != ':') {
6647 * bash complains on: var=qwe; echo ${var:1a:123}
6649 ash_msg_and_raise_error(msg_illnum, str);
6653 if (*loc++ == ':') {
6658 /* ${VAR:$((-n)):l} starts n chars from the end */
6659 pos = orig_len + pos;
6661 if ((unsigned)pos >= orig_len) {
6662 /* apart from obvious ${VAR:999999:l},
6663 * covers ${VAR:$((-9999999)):l} - result is ""
6669 if (len > (orig_len - pos))
6670 len = orig_len - pos;
6672 for (str = startp; pos; str++, pos--) {
6673 if (quotes && (unsigned char)*str == CTLESC)
6676 for (loc = startp; len; len--) {
6677 if (quotes && (unsigned char)*str == CTLESC)
6682 amount = loc - expdest;
6683 STADJUST(amount, expdest);
6685 #endif /* BASH_SUBSTR */
6688 resetloc = expdest - (char *)stackblock();
6690 #if BASH_PATTERN_SUBST
6691 /* We'll comeback here if we grow the stack while handling
6692 * a VSREPLACE or VSREPLACEALL, since our pointers into the
6693 * stack will need rebasing, and we'll need to remove our work
6699 amount = expdest - ((char *)stackblock() + resetloc);
6700 STADJUST(-amount, expdest);
6701 startp = (char *)stackblock() + startloc;
6704 rmescend = (char *)stackblock() + strloc;
6706 rmesc = rmescapes(startp, RMESCAPE_ALLOC | RMESCAPE_GROW);
6707 if (rmesc != startp) {
6709 startp = (char *)stackblock() + startloc;
6713 str = (char *)stackblock() + strloc;
6715 * Example: v='a\bc'; echo ${v/\\b/_\\_\z_}
6716 * The result is a_\_z_c (not a\_\_z_c)!
6718 * The search pattern and replace string treat backslashes differently!
6719 * RMESCAPE_SLASH causes preglob to work differently on the pattern
6720 * and string. It's only used on the first call.
6722 preglob(str, IF_BASH_PATTERN_SUBST(
6723 (subtype == VSREPLACE || subtype == VSREPLACEALL) && !repl ?
6724 RMESCAPE_SLASH : ) 0);
6726 #if BASH_PATTERN_SUBST
6727 workloc = expdest - (char *)stackblock();
6728 if (subtype == VSREPLACE || subtype == VSREPLACEALL) {
6732 repl = strchr(str, CTLESC);
6738 //bb_error_msg("str:'%s' repl:'%s'", str, repl);
6740 /* If there's no pattern to match, return the expansion unmolested */
6749 loc = scanright(idx, rmesc, rmescend, str, quotes, 1);
6750 //bb_error_msg("scanright('%s'):'%s'", str, loc);
6752 /* No match, advance */
6753 char *restart_detect = stackblock();
6755 STPUTC(*idx, expdest);
6756 if (quotes && (unsigned char)*idx == CTLESC) {
6759 STPUTC(*idx, expdest);
6761 if (stackblock() != restart_detect)
6766 /* continue; - prone to quadratic behavior, smarter code: */
6769 if (str[0] == '*') {
6770 /* Pattern is "*foo". If "*foo" does not match "long_string",
6771 * it would never match "ong_string" etc, no point in trying.
6778 if (subtype == VSREPLACEALL) {
6780 if (quotes && (unsigned char)*idx == CTLESC)
6789 //bb_error_msg("repl:'%s'", repl);
6790 for (loc = (char*)repl; *loc; loc++) {
6791 char *restart_detect = stackblock();
6792 if (quotes && *loc == '\\') {
6793 STPUTC(CTLESC, expdest);
6796 STPUTC(*loc, expdest);
6797 if (stackblock() != restart_detect)
6802 if (subtype == VSREPLACE) {
6803 //bb_error_msg("tail:'%s', quotes:%x", idx, quotes);
6805 char *restart_detect = stackblock();
6806 STPUTC(*idx, expdest);
6807 if (stackblock() != restart_detect)
6816 /* We've put the replaced text into a buffer at workloc, now
6817 * move it to the right place and adjust the stack.
6819 STPUTC('\0', expdest);
6820 startp = (char *)stackblock() + startloc;
6821 memmove(startp, (char *)stackblock() + workloc, len + 1);
6822 //bb_error_msg("startp:'%s'", startp);
6823 amount = expdest - (startp + len);
6824 STADJUST(-amount, expdest);
6827 #endif /* BASH_PATTERN_SUBST */
6829 subtype -= VSTRIMRIGHT;
6831 if (subtype < 0 || subtype > 7)
6834 /* zero = (subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX) */
6835 zero = subtype >> 1;
6836 /* VSTRIMLEFT/VSTRIMRIGHTMAX -> scanleft */
6837 scan = (subtype & 1) ^ zero ? scanleft : scanright;
6839 loc = scan(startp, rmesc, rmescend, str, quotes, zero);
6842 memmove(startp, loc, str - loc);
6843 loc = startp + (str - loc) - 1;
6846 amount = loc - expdest;
6847 STADJUST(amount, expdest);
6853 * Add the value of a specialized variable to the stack string.
6854 * name parameter (examples):
6855 * ash -c 'echo $1' name:'1='
6856 * ash -c 'echo $qwe' name:'qwe='
6857 * ash -c 'echo $$' name:'$='
6858 * ash -c 'echo ${$}' name:'$='
6859 * ash -c 'echo ${$##q}' name:'$=q'
6860 * ash -c 'echo ${#$}' name:'$='
6861 * note: examples with bad shell syntax:
6862 * ash -c 'echo ${#$1}' name:'$=1'
6863 * ash -c 'echo ${#1#}' name:'1=#'
6865 static NOINLINE ssize_t
6866 varvalue(char *name, int varflags, int flags, struct strlist *var_str_list, int *quotedp)
6873 int quoted = *quotedp;
6874 int subtype = varflags & VSTYPE;
6875 int discard = subtype == VSPLUS || subtype == VSLENGTH;
6876 int quotes = (discard ? 0 : (flags & QUOTES_ESC)) | QUOTES_KEEPNUL;
6879 sep = (flags & EXP_FULL) << CHAR_BIT;
6880 syntax = quoted ? DQSYNTAX : BASESYNTAX;
6890 num = shellparam.nparam;
6898 goto check_1char_name;
6900 expdest = makestrspace(NOPTS, expdest);
6901 for (i = NOPTS - 1; i >= 0; i--) {
6903 USTPUTC(optletters(i), expdest);
6909 /* handles cases similar to ${#$1} */
6910 if (name[2] != '\0')
6911 raise_error_syntax("bad substitution");
6924 sep |= ifsset() ? ifsval()[0] : ' ';
6931 while ((p = *ap++) != NULL) {
6932 len += strtodest(p, syntax, quotes);
6936 memtodest(&sepc, 1, syntax, quotes);
6951 num = atoi(name); /* number(name) fails on ${N#str} etc */
6952 if (num < 0 || num > shellparam.nparam)
6954 p = num ? shellparam.p[num - 1] : arg0;
6957 /* NB: name has form "VAR=..." */
6959 /* "A=a B=$A" case: var_str_list is a list of "A=a" strings
6960 * which should be considered before we check variables. */
6962 unsigned name_len = (strchrnul(name, '=') - name) + 1;
6966 str = var_str_list->text;
6967 eq = strchr(str, '=');
6968 if (!eq) /* stop at first non-assignment */
6971 if (name_len == (unsigned)(eq - str)
6972 && strncmp(str, name, name_len) == 0
6975 /* goto value; - WRONG! */
6976 /* think "A=1 A=2 B=$A" */
6978 var_str_list = var_str_list->next;
6979 } while (var_str_list);
6983 p = lookupvar(name);
6988 len = strtodest(p, syntax, quotes);
6989 #if ENABLE_UNICODE_SUPPORT
6990 if (subtype == VSLENGTH && len > 0) {
6991 reinit_unicode_for_ash();
6992 if (unicode_status == UNICODE_ON) {
6993 STADJUST(-len, expdest);
6995 len = unicode_strlen(p);
7003 STADJUST(-len, expdest);
7008 * Expand a variable, and return a pointer to the next character in the
7012 evalvar(char *p, int flag, struct strlist *var_str_list)
7023 varflags = (unsigned char) *p++;
7024 subtype = varflags & VSTYPE;
7027 raise_error_syntax("bad substitution");
7029 quoted = flag & EXP_QUOTED;
7031 easy = (!quoted || (*var == '@' && shellparam.nparam));
7032 startloc = expdest - (char *)stackblock();
7033 p = strchr(p, '=') + 1; //TODO: use var_end(p)?
7036 varlen = varvalue(var, varflags, flag, var_str_list, "ed);
7037 if (varflags & VSNUL)
7040 if (subtype == VSPLUS) {
7041 varlen = -1 - varlen;
7045 if (subtype == VSMINUS) {
7050 flag | EXP_TILDE | EXP_WORD,
7058 if (subtype == VSASSIGN || subtype == VSQUESTION) {
7062 subevalvar(p, var, 0, subtype, startloc, varflags,
7063 flag & ~QUOTES_ESC, var_str_list);
7066 * Remove any recorded regions beyond
7069 removerecordregions(startloc);
7073 if (varlen < 0 && uflag)
7074 varunset(p, var, 0, 0);
7076 if (subtype == VSLENGTH) {
7077 cvtnum(varlen > 0 ? varlen : 0);
7081 if (subtype == VSNORMAL) {
7085 recordregion(startloc, expdest - (char *)stackblock(), quoted);
7094 case VSTRIMRIGHTMAX:
7098 #if BASH_PATTERN_SUBST
7110 * Terminate the string and start recording the pattern
7113 STPUTC('\0', expdest);
7114 patloc = expdest - (char *)stackblock();
7115 if (NULL == subevalvar(p, /* varname: */ NULL, patloc, subtype,
7116 startloc, varflags, flag, var_str_list)) {
7117 int amount = expdest - (
7118 (char *)stackblock() + patloc - 1
7120 STADJUST(-amount, expdest);
7122 /* Remove any recorded regions beyond start of variable */
7123 removerecordregions(startloc);
7128 if (subtype != VSNORMAL) { /* skip to end of alternative */
7131 unsigned char c = *p++;
7134 else if (c == CTLBACKQ) {
7136 argbackq = argbackq->next;
7137 } else if (c == CTLVAR) {
7138 if ((*p++ & VSTYPE) != VSNORMAL)
7140 } else if (c == CTLENDVAR) {
7150 * Add a file name to the list.
7153 addfname(const char *name)
7157 sp = stzalloc(sizeof(*sp));
7158 sp->text = sstrdup(name);
7160 exparg.lastp = &sp->next;
7163 /* Avoid glob() (and thus, stat() et al) for words like "echo" */
7165 hasmeta(const char *p)
7167 static const char chars[] ALIGN1 = {
7168 '*', '?', '[', '\\', CTLQUOTEMARK, CTLESC, 0
7172 p = strpbrk(p, chars);
7175 switch ((unsigned char) *p) {
7179 if (*p == CTLQUOTEMARK)
7183 if (*p == '\0') /* huh? */
7194 if (!strchr(p + 1, ']')) {
7195 /* It's not a properly closed [] pattern,
7196 * but other metas may follow. Continue checking.
7197 * my[file* _is_ globbed by bash
7198 * and matches filenames like "my[file1".
7214 /* If we want to use glob() from libc... */
7215 #if !ENABLE_ASH_INTERNAL_GLOB
7217 /* Add the result of glob() to the list */
7219 addglob(const glob_t *pglob)
7221 char **p = pglob->gl_pathv;
7228 expandmeta(struct strlist *str /*, int flag*/)
7230 /* TODO - EXP_REDIR */
7240 if (!hasmeta(str->text))
7244 p = preglob(str->text, RMESCAPE_ALLOC | RMESCAPE_HEAP);
7245 // GLOB_NOMAGIC (GNU): if no *?[ chars in pattern, return it even if no match
7246 // GLOB_NOCHECK: if no match, return unchanged pattern (sans \* escapes?)
7248 // glibc 2.24.90 glob(GLOB_NOMAGIC) does not remove backslashes used for escaping:
7249 // if you pass it "file\?", it returns "file\?", not "file?", if no match.
7250 // Which means you need to unescape the string, right? Not so fast:
7251 // if there _is_ a file named "file\?" (with backslash), it is returned
7252 // as "file\?" too (whichever pattern you used to find it, say, "file*").
7253 // You DONT KNOW by looking at the result whether you need to unescape it.
7255 // Worse, globbing of "file\?" in a directory with two files, "file?" and "file\?",
7256 // returns "file\?" - which is WRONG: "file\?" pattern matches "file?" file.
7257 // Without GLOB_NOMAGIC, this works correctly ("file?" is returned as a match).
7258 // With GLOB_NOMAGIC | GLOB_NOCHECK, this also works correctly.
7259 // i = glob(p, GLOB_NOMAGIC | GLOB_NOCHECK, NULL, &pglob);
7260 // i = glob(p, GLOB_NOMAGIC, NULL, &pglob);
7261 i = glob(p, 0, NULL, &pglob);
7262 //bb_error_msg("glob('%s'):%d '%s'...", p, i, pglob.gl_pathv ? pglob.gl_pathv[0] : "-");
7267 #if 0 // glibc 2.24.90 bug? Patterns like "*/file", when match, don't set GLOB_MAGCHAR
7268 /* GLOB_MAGCHAR is set if *?[ chars were seen (GNU) */
7269 if (!(pglob.gl_flags & GLOB_MAGCHAR))
7281 *exparg.lastp = str;
7282 rmescapes(str->text, 0);
7283 exparg.lastp = &str->next;
7285 default: /* GLOB_NOSPACE */
7288 ash_msg_and_raise_error(bb_msg_memory_exhausted);
7295 /* ENABLE_ASH_INTERNAL_GLOB: Homegrown globbing code. (dash also has both, uses homegrown one.) */
7298 * Do metacharacter (i.e. *, ?, [...]) expansion.
7301 expmeta(char *expdir, char *enddir, char *name)
7317 for (p = name; esc = 0, *p; p += esc + 1) {
7318 if (*p == '*' || *p == '?')
7320 else if (*p == '[') {
7327 if (*q == '/' || *q == '\0')
7337 if (p[esc] == '/') {
7340 start = p + esc + 1;
7344 if (metaflag == 0) { /* we've reached the end of the file name */
7345 if (enddir != expdir)
7353 if (metaflag == 0 || lstat(expdir, &statb) >= 0)
7364 } while (p < start);
7366 if (enddir == expdir) {
7368 } else if (enddir == expdir + 1 && *expdir == '/') {
7377 if (enddir != expdir)
7379 if (*endname == 0) {
7392 while (!pending_int && (dp = readdir(dirp)) != NULL) {
7393 if (dp->d_name[0] == '.' && !matchdot)
7395 if (pmatch(start, dp->d_name)) {
7397 strcpy(enddir, dp->d_name);
7400 for (p = enddir, cp = dp->d_name; (*p++ = *cp++) != '\0';)
7403 expmeta(expdir, p, endname);
7409 endname[-esc - 1] = esc ? '\\' : '/';
7412 static struct strlist *
7413 msort(struct strlist *list, int len)
7415 struct strlist *p, *q = NULL;
7416 struct strlist **lpp;
7424 for (n = half; --n >= 0;) {
7428 q->next = NULL; /* terminate first half of list */
7429 q = msort(list, half); /* sort first half of list */
7430 p = msort(p, len - half); /* sort second half */
7433 #if ENABLE_LOCALE_SUPPORT
7434 if (strcoll(p->text, q->text) < 0)
7436 if (strcmp(p->text, q->text) < 0)
7460 * Sort the results of file name expansion. It calculates the number of
7461 * strings to sort and then calls msort (short for merge sort) to do the
7464 static struct strlist *
7465 expsort(struct strlist *str)
7471 for (sp = str; sp; sp = sp->next)
7473 return msort(str, len);
7477 expandmeta(struct strlist *str /*, int flag*/)
7479 /* TODO - EXP_REDIR */
7483 struct strlist **savelastp;
7489 if (!hasmeta(str->text))
7491 savelastp = exparg.lastp;
7494 p = preglob(str->text, RMESCAPE_ALLOC | RMESCAPE_HEAP);
7496 int i = strlen(str->text);
7497 //BUGGY estimation of how long expanded name can be
7498 expdir = ckmalloc(i < 2048 ? 2048 : i+1);
7500 expmeta(expdir, expdir, p);
7505 if (exparg.lastp == savelastp) {
7510 *exparg.lastp = str;
7511 rmescapes(str->text, 0);
7512 exparg.lastp = &str->next;
7514 *exparg.lastp = NULL;
7515 *savelastp = sp = expsort(*savelastp);
7516 while (sp->next != NULL)
7518 exparg.lastp = &sp->next;
7523 #endif /* ENABLE_ASH_INTERNAL_GLOB */
7526 * Perform variable substitution and command substitution on an argument,
7527 * placing the resulting list of arguments in arglist. If EXP_FULL is true,
7528 * perform splitting and file name expansion. When arglist is NULL, perform
7529 * here document expansion.
7532 expandarg(union node *arg, struct arglist *arglist, int flag)
7537 argbackq = arg->narg.backquote;
7538 STARTSTACKSTR(expdest);
7539 TRACE(("expandarg: argstr('%s',flags:%x)\n", arg->narg.text, flag));
7540 argstr(arg->narg.text, flag,
7541 /* var_str_list: */ arglist ? arglist->list : NULL);
7542 p = _STPUTC('\0', expdest);
7544 if (arglist == NULL) {
7545 /* here document expanded */
7548 p = grabstackstr(p);
7549 TRACE(("expandarg: p:'%s'\n", p));
7550 exparg.lastp = &exparg.list;
7554 if (flag & EXP_FULL) {
7555 ifsbreakup(p, &exparg);
7556 *exparg.lastp = NULL;
7557 exparg.lastp = &exparg.list;
7558 expandmeta(exparg.list /*, flag*/);
7560 if (flag & EXP_REDIR) { /*XXX - for now, just remove escapes */
7562 TRACE(("expandarg: rmescapes:'%s'\n", p));
7564 sp = stzalloc(sizeof(*sp));
7567 exparg.lastp = &sp->next;
7569 *exparg.lastp = NULL;
7571 *arglist->lastp = exparg.list;
7572 arglist->lastp = exparg.lastp;
7580 * Expand shell variables and backquotes inside a here document.
7583 expandhere(union node *arg, int fd)
7585 expandarg(arg, (struct arglist *)NULL, EXP_QUOTED);
7586 full_write(fd, stackblock(), expdest - (char *)stackblock());
7590 * Returns true if the pattern matches the string.
7593 patmatch(char *pattern, const char *string)
7595 return pmatch(preglob(pattern, 0), string);
7599 * See if a pattern matches in a case statement.
7602 casematch(union node *pattern, char *val)
7604 struct stackmark smark;
7607 setstackmark(&smark);
7608 argbackq = pattern->narg.backquote;
7609 STARTSTACKSTR(expdest);
7610 argstr(pattern->narg.text, EXP_TILDE | EXP_CASE,
7611 /* var_str_list: */ NULL);
7612 STACKSTRNUL(expdest);
7614 result = patmatch(stackblock(), val);
7615 popstackmark(&smark);
7620 /* ============ find_command */
7624 int (*builtin)(int, char **) FAST_FUNC;
7625 /* unsigned flags; */
7627 #define IS_BUILTIN_SPECIAL(b) ((b)->name[0] & 1)
7628 /* "regular" builtins always take precedence over commands,
7629 * regardless of PATH=....%builtin... position */
7630 #define IS_BUILTIN_REGULAR(b) ((b)->name[0] & 2)
7631 #define IS_BUILTIN_ASSIGN(b) ((b)->name[0] & 4)
7634 smallint cmdtype; /* CMDxxx */
7637 /* index >= 0 for commands without path (slashes) */
7638 /* (TODO: what exactly does the value mean? PATH position?) */
7639 /* index == -1 for commands with slashes */
7640 /* index == (-2 - applet_no) for NOFORK applets */
7641 const struct builtincmd *cmd;
7642 struct funcnode *func;
7645 /* values of cmdtype */
7646 #define CMDUNKNOWN -1 /* no entry in table for command */
7647 #define CMDNORMAL 0 /* command is an executable program */
7648 #define CMDFUNCTION 1 /* command is a shell function */
7649 #define CMDBUILTIN 2 /* command is a shell builtin */
7651 /* action to find_command() */
7652 #define DO_ERR 0x01 /* prints errors */
7653 #define DO_ABS 0x02 /* checks absolute paths */
7654 #define DO_NOFUNC 0x04 /* don't return shell functions, for command */
7655 #define DO_ALTPATH 0x08 /* using alternate path */
7656 #define DO_ALTBLTIN 0x20 /* %builtin in alt. path */
7658 static void find_command(char *, struct cmdentry *, int, const char *);
7661 /* ============ Hashing commands */
7664 * When commands are first encountered, they are entered in a hash table.
7665 * This ensures that a full path search will not have to be done for them
7666 * on each invocation.
7668 * We should investigate converting to a linear search, even though that
7669 * would make the command name "hash" a misnomer.
7673 struct tblentry *next; /* next entry in hash chain */
7674 union param param; /* definition of builtin function */
7675 smallint cmdtype; /* CMDxxx */
7676 char rehash; /* if set, cd done since entry created */
7677 char cmdname[1]; /* name of command */
7680 static struct tblentry **cmdtable;
7681 #define INIT_G_cmdtable() do { \
7682 cmdtable = xzalloc(CMDTABLESIZE * sizeof(cmdtable[0])); \
7685 static int builtinloc = -1; /* index in path of %builtin, or -1 */
7689 tryexec(IF_FEATURE_SH_STANDALONE(int applet_no,) char *cmd, char **argv, char **envp)
7691 #if ENABLE_FEATURE_SH_STANDALONE
7692 if (applet_no >= 0) {
7693 if (APPLET_IS_NOEXEC(applet_no)) {
7697 run_applet_no_and_exit(applet_no, argv);
7699 /* re-exec ourselves with the new arguments */
7700 execve(bb_busybox_exec_path, argv, envp);
7701 /* If they called chroot or otherwise made the binary no longer
7702 * executable, fall through */
7709 execve(cmd, argv, envp);
7710 } while (errno == EINTR);
7712 execve(cmd, argv, envp);
7714 if (cmd != (char*) bb_busybox_exec_path && errno == ENOEXEC) {
7715 /* Run "cmd" as a shell script:
7716 * http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html
7717 * "If the execve() function fails with ENOEXEC, the shell
7718 * shall execute a command equivalent to having a shell invoked
7719 * with the command name as its first operand,
7720 * with any remaining arguments passed to the new shell"
7722 * That is, do not use $SHELL, user's shell, or /bin/sh;
7723 * just call ourselves.
7725 * Note that bash reads ~80 chars of the file, and if it sees
7726 * a zero byte before it sees newline, it doesn't try to
7727 * interpret it, but fails with "cannot execute binary file"
7728 * message and exit code 126. For one, this prevents attempts
7729 * to interpret foreign ELF binaries as shell scripts.
7732 cmd = (char*) bb_busybox_exec_path;
7733 /* NB: this is only possible because all callers of shellexec()
7734 * ensure that the argv[-1] slot exists!
7737 argv[0] = (char*) "ash";
7743 * Exec a program. Never returns. If you change this routine, you may
7744 * have to change the find_command routine as well.
7745 * argv[-1] must exist and be writable! See tryexec() for why.
7747 static void shellexec(char *prog, char **argv, const char *path, int idx) NORETURN;
7748 static void shellexec(char *prog, char **argv, const char *path, int idx)
7754 int applet_no = -1; /* used only by FEATURE_SH_STANDALONE */
7756 envp = listvars(VEXPORT, VUNSET, /*end:*/ NULL);
7757 if (strchr(prog, '/') != NULL
7758 #if ENABLE_FEATURE_SH_STANDALONE
7759 || (applet_no = find_applet_by_name(prog)) >= 0
7762 tryexec(IF_FEATURE_SH_STANDALONE(applet_no,) prog, argv, envp);
7763 if (applet_no >= 0) {
7764 /* We tried execing ourself, but it didn't work.
7765 * Maybe /proc/self/exe doesn't exist?
7774 while ((cmdname = path_advance(&path, prog)) != NULL) {
7775 if (--idx < 0 && pathopt == NULL) {
7776 tryexec(IF_FEATURE_SH_STANDALONE(-1,) cmdname, argv, envp);
7777 if (errno != ENOENT && errno != ENOTDIR)
7784 /* Map to POSIX errors */
7796 exitstatus = exerrno;
7797 TRACE(("shellexec failed for %s, errno %d, suppress_int %d\n",
7798 prog, e, suppress_int));
7799 ash_msg_and_raise(EXEXIT, "%s: %s", prog, errmsg(e, "not found"));
7804 printentry(struct tblentry *cmdp)
7810 idx = cmdp->param.index;
7813 name = path_advance(&path, cmdp->cmdname);
7815 } while (--idx >= 0);
7816 out1fmt("%s%s\n", name, (cmdp->rehash ? "*" : nullstr));
7820 * Clear out command entries. The argument specifies the first entry in
7821 * PATH which has changed.
7824 clearcmdentry(int firstchange)
7826 struct tblentry **tblp;
7827 struct tblentry **pp;
7828 struct tblentry *cmdp;
7831 for (tblp = cmdtable; tblp < &cmdtable[CMDTABLESIZE]; tblp++) {
7833 while ((cmdp = *pp) != NULL) {
7834 if ((cmdp->cmdtype == CMDNORMAL &&
7835 cmdp->param.index >= firstchange)
7836 || (cmdp->cmdtype == CMDBUILTIN &&
7837 builtinloc >= firstchange)
7850 * Locate a command in the command hash table. If "add" is nonzero,
7851 * add the command to the table if it is not already present. The
7852 * variable "lastcmdentry" is set to point to the address of the link
7853 * pointing to the entry, so that delete_cmd_entry can delete the
7856 * Interrupts must be off if called with add != 0.
7858 static struct tblentry **lastcmdentry;
7860 static struct tblentry *
7861 cmdlookup(const char *name, int add)
7863 unsigned int hashval;
7865 struct tblentry *cmdp;
7866 struct tblentry **pp;
7869 hashval = (unsigned char)*p << 4;
7871 hashval += (unsigned char)*p++;
7873 pp = &cmdtable[hashval % CMDTABLESIZE];
7874 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7875 if (strcmp(cmdp->cmdname, name) == 0)
7879 if (add && cmdp == NULL) {
7880 cmdp = *pp = ckzalloc(sizeof(struct tblentry)
7882 /* + 1 - already done because
7883 * tblentry::cmdname is char[1] */);
7884 /*cmdp->next = NULL; - ckzalloc did it */
7885 cmdp->cmdtype = CMDUNKNOWN;
7886 strcpy(cmdp->cmdname, name);
7893 * Delete the command entry returned on the last lookup.
7896 delete_cmd_entry(void)
7898 struct tblentry *cmdp;
7901 cmdp = *lastcmdentry;
7902 *lastcmdentry = cmdp->next;
7903 if (cmdp->cmdtype == CMDFUNCTION)
7904 freefunc(cmdp->param.func);
7910 * Add a new command entry, replacing any existing command entry for
7911 * the same name - except special builtins.
7914 addcmdentry(char *name, struct cmdentry *entry)
7916 struct tblentry *cmdp;
7918 cmdp = cmdlookup(name, 1);
7919 if (cmdp->cmdtype == CMDFUNCTION) {
7920 freefunc(cmdp->param.func);
7922 cmdp->cmdtype = entry->cmdtype;
7923 cmdp->param = entry->u;
7927 static int FAST_FUNC
7928 hashcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
7930 struct tblentry **pp;
7931 struct tblentry *cmdp;
7933 struct cmdentry entry;
7936 if (nextopt("r") != '\0') {
7941 if (*argptr == NULL) {
7942 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
7943 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7944 if (cmdp->cmdtype == CMDNORMAL)
7952 while ((name = *argptr) != NULL) {
7953 cmdp = cmdlookup(name, 0);
7955 && (cmdp->cmdtype == CMDNORMAL
7956 || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))
7960 find_command(name, &entry, DO_ERR, pathval());
7961 if (entry.cmdtype == CMDUNKNOWN)
7969 * Called when a cd is done. Marks all commands so the next time they
7970 * are executed they will be rehashed.
7975 struct tblentry **pp;
7976 struct tblentry *cmdp;
7978 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
7979 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7980 if (cmdp->cmdtype == CMDNORMAL
7981 || (cmdp->cmdtype == CMDBUILTIN
7982 && !IS_BUILTIN_REGULAR(cmdp->param.cmd)
7992 * Fix command hash table when PATH changed.
7993 * Called before PATH is changed. The argument is the new value of PATH;
7994 * pathval() still returns the old value at this point.
7995 * Called with interrupts off.
7997 static void FAST_FUNC
7998 changepath(const char *new)
8006 firstchange = 9999; /* assume no change */
8012 if ((*old == '\0' && *new == ':')
8013 || (*old == ':' && *new == '\0')
8017 old = new; /* ignore subsequent differences */
8021 if (*new == '%' && idx_bltin < 0 && prefix(new + 1, "builtin"))
8028 if (builtinloc < 0 && idx_bltin >= 0)
8029 builtinloc = idx_bltin; /* zap builtins */
8030 if (builtinloc >= 0 && idx_bltin < 0)
8032 clearcmdentry(firstchange);
8033 builtinloc = idx_bltin;
8069 typedef smallint token_id_t;
8071 /* Nth bit indicates if token marks the end of a list */
8074 /* 0 */ | (1u << TEOF)
8075 /* 1 */ | (0u << TNL)
8076 /* 2 */ | (0u << TREDIR)
8077 /* 3 */ | (0u << TWORD)
8078 /* 4 */ | (0u << TSEMI)
8079 /* 5 */ | (0u << TBACKGND)
8080 /* 6 */ | (0u << TAND)
8081 /* 7 */ | (0u << TOR)
8082 /* 8 */ | (0u << TPIPE)
8083 /* 9 */ | (0u << TLP)
8084 /* 10 */ | (1u << TRP)
8085 /* 11 */ | (1u << TENDCASE)
8086 /* 12 */ | (1u << TENDBQUOTE)
8087 /* 13 */ | (0u << TNOT)
8088 /* 14 */ | (0u << TCASE)
8089 /* 15 */ | (1u << TDO)
8090 /* 16 */ | (1u << TDONE)
8091 /* 17 */ | (1u << TELIF)
8092 /* 18 */ | (1u << TELSE)
8093 /* 19 */ | (1u << TESAC)
8094 /* 20 */ | (1u << TFI)
8095 /* 21 */ | (0u << TFOR)
8097 /* 22 */ | (0u << TFUNCTION)
8099 /* 23 */ | (0u << TIF)
8100 /* 24 */ | (0u << TIN)
8101 /* 25 */ | (1u << TTHEN)
8102 /* 26 */ | (0u << TUNTIL)
8103 /* 27 */ | (0u << TWHILE)
8104 /* 28 */ | (0u << TBEGIN)
8105 /* 29 */ | (1u << TEND)
8106 , /* thus far 29 bits used */
8109 static const char *const tokname_array[] = {
8123 #define KWDOFFSET 13
8124 /* the following are keywords */
8146 /* Wrapper around strcmp for qsort/bsearch/... */
8148 pstrcmp(const void *a, const void *b)
8150 return strcmp((char*)a, *(char**)b);
8153 static const char *const *
8154 findkwd(const char *s)
8156 return bsearch(s, tokname_array + KWDOFFSET,
8157 ARRAY_SIZE(tokname_array) - KWDOFFSET,
8158 sizeof(tokname_array[0]), pstrcmp);
8162 * Locate and print what a word is...
8165 describe_command(char *command, const char *path, int describe_command_verbose)
8167 struct cmdentry entry;
8168 struct tblentry *cmdp;
8169 #if ENABLE_ASH_ALIAS
8170 const struct alias *ap;
8173 path = path ? path : pathval();
8175 if (describe_command_verbose) {
8179 /* First look at the keywords */
8180 if (findkwd(command)) {
8181 out1str(describe_command_verbose ? " is a shell keyword" : command);
8185 #if ENABLE_ASH_ALIAS
8186 /* Then look at the aliases */
8187 ap = lookupalias(command, 0);
8189 if (!describe_command_verbose) {
8194 out1fmt(" is an alias for %s", ap->val);
8198 /* Then check if it is a tracked alias */
8199 cmdp = cmdlookup(command, 0);
8201 entry.cmdtype = cmdp->cmdtype;
8202 entry.u = cmdp->param;
8204 /* Finally use brute force */
8205 find_command(command, &entry, DO_ABS, path);
8208 switch (entry.cmdtype) {
8210 int j = entry.u.index;
8216 p = path_advance(&path, command);
8220 if (describe_command_verbose) {
8222 (cmdp ? " a tracked alias for" : nullstr), p
8231 if (describe_command_verbose) {
8232 out1str(" is a shell function");
8239 if (describe_command_verbose) {
8240 out1fmt(" is a %sshell builtin",
8241 IS_BUILTIN_SPECIAL(entry.u.cmd) ?
8242 "special " : nullstr
8250 if (describe_command_verbose) {
8251 out1str(": not found\n");
8260 static int FAST_FUNC
8261 typecmd(int argc UNUSED_PARAM, char **argv)
8267 /* type -p ... ? (we don't bother checking for 'p') */
8268 if (argv[1] && argv[1][0] == '-') {
8273 err |= describe_command(argv[i++], NULL, verbose);
8278 #if ENABLE_ASH_CMDCMD
8279 /* Is it "command [-p] PROG ARGS" bltin, no other opts? Return ptr to "PROG" if yes */
8281 parse_command_args(char **argv, const char **path)
8294 if (c == '-' && !*cp) {
8302 *path = bb_default_path;
8305 /* run 'typecmd' for other options */
8314 static int FAST_FUNC
8315 commandcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
8323 const char *path = NULL;
8325 /* "command [-p] PROG ARGS" (that is, without -V or -v)
8326 * never reaches this function.
8329 while ((c = nextopt("pvV")) != '\0')
8331 verify |= VERIFY_VERBOSE;
8333 /*verify |= VERIFY_BRIEF*/;
8339 path = bb_default_path;
8341 /* Mimic bash: just "command -v" doesn't complain, it's a nop */
8343 if (/*verify && */ cmd)
8344 return describe_command(cmd, path, verify /* - VERIFY_BRIEF*/);
8351 /*static int funcblocksize; // size of structures in function */
8352 /*static int funcstringsize; // size of strings in node */
8353 static void *funcblock; /* block to allocate function from */
8354 static char *funcstring_end; /* end of block to allocate strings from */
8356 /* flags in argument to evaltree */
8357 #define EV_EXIT 01 /* exit after evaluating tree */
8358 #define EV_TESTED 02 /* exit status is checked; ignore -e flag */
8360 static const uint8_t nodesize[N_NUMBER] ALIGN1 = {
8361 [NCMD ] = SHELL_ALIGN(sizeof(struct ncmd)),
8362 [NPIPE ] = SHELL_ALIGN(sizeof(struct npipe)),
8363 [NREDIR ] = SHELL_ALIGN(sizeof(struct nredir)),
8364 [NBACKGND ] = SHELL_ALIGN(sizeof(struct nredir)),
8365 [NSUBSHELL] = SHELL_ALIGN(sizeof(struct nredir)),
8366 [NAND ] = SHELL_ALIGN(sizeof(struct nbinary)),
8367 [NOR ] = SHELL_ALIGN(sizeof(struct nbinary)),
8368 [NSEMI ] = SHELL_ALIGN(sizeof(struct nbinary)),
8369 [NIF ] = SHELL_ALIGN(sizeof(struct nif)),
8370 [NWHILE ] = SHELL_ALIGN(sizeof(struct nbinary)),
8371 [NUNTIL ] = SHELL_ALIGN(sizeof(struct nbinary)),
8372 [NFOR ] = SHELL_ALIGN(sizeof(struct nfor)),
8373 [NCASE ] = SHELL_ALIGN(sizeof(struct ncase)),
8374 [NCLIST ] = SHELL_ALIGN(sizeof(struct nclist)),
8375 [NDEFUN ] = SHELL_ALIGN(sizeof(struct narg)),
8376 [NARG ] = SHELL_ALIGN(sizeof(struct narg)),
8377 [NTO ] = SHELL_ALIGN(sizeof(struct nfile)),
8378 #if BASH_REDIR_OUTPUT
8379 [NTO2 ] = SHELL_ALIGN(sizeof(struct nfile)),
8381 [NCLOBBER ] = SHELL_ALIGN(sizeof(struct nfile)),
8382 [NFROM ] = SHELL_ALIGN(sizeof(struct nfile)),
8383 [NFROMTO ] = SHELL_ALIGN(sizeof(struct nfile)),
8384 [NAPPEND ] = SHELL_ALIGN(sizeof(struct nfile)),
8385 [NTOFD ] = SHELL_ALIGN(sizeof(struct ndup)),
8386 [NFROMFD ] = SHELL_ALIGN(sizeof(struct ndup)),
8387 [NHERE ] = SHELL_ALIGN(sizeof(struct nhere)),
8388 [NXHERE ] = SHELL_ALIGN(sizeof(struct nhere)),
8389 [NNOT ] = SHELL_ALIGN(sizeof(struct nnot)),
8392 static int calcsize(int funcblocksize, union node *n);
8395 sizenodelist(int funcblocksize, struct nodelist *lp)
8398 funcblocksize += SHELL_ALIGN(sizeof(struct nodelist));
8399 funcblocksize = calcsize(funcblocksize, lp->n);
8402 return funcblocksize;
8406 calcsize(int funcblocksize, union node *n)
8409 return funcblocksize;
8410 funcblocksize += nodesize[n->type];
8413 funcblocksize = calcsize(funcblocksize, n->ncmd.redirect);
8414 funcblocksize = calcsize(funcblocksize, n->ncmd.args);
8415 funcblocksize = calcsize(funcblocksize, n->ncmd.assign);
8418 funcblocksize = sizenodelist(funcblocksize, n->npipe.cmdlist);
8423 funcblocksize = calcsize(funcblocksize, n->nredir.redirect);
8424 funcblocksize = calcsize(funcblocksize, n->nredir.n);
8431 funcblocksize = calcsize(funcblocksize, n->nbinary.ch2);
8432 funcblocksize = calcsize(funcblocksize, n->nbinary.ch1);
8435 funcblocksize = calcsize(funcblocksize, n->nif.elsepart);
8436 funcblocksize = calcsize(funcblocksize, n->nif.ifpart);
8437 funcblocksize = calcsize(funcblocksize, n->nif.test);
8440 funcblocksize += SHELL_ALIGN(strlen(n->nfor.var) + 1); /* was funcstringsize += ... */
8441 funcblocksize = calcsize(funcblocksize, n->nfor.body);
8442 funcblocksize = calcsize(funcblocksize, n->nfor.args);
8445 funcblocksize = calcsize(funcblocksize, n->ncase.cases);
8446 funcblocksize = calcsize(funcblocksize, n->ncase.expr);
8449 funcblocksize = calcsize(funcblocksize, n->nclist.body);
8450 funcblocksize = calcsize(funcblocksize, n->nclist.pattern);
8451 funcblocksize = calcsize(funcblocksize, n->nclist.next);
8455 funcblocksize = sizenodelist(funcblocksize, n->narg.backquote);
8456 funcblocksize += SHELL_ALIGN(strlen(n->narg.text) + 1); /* was funcstringsize += ... */
8457 funcblocksize = calcsize(funcblocksize, n->narg.next);
8460 #if BASH_REDIR_OUTPUT
8467 funcblocksize = calcsize(funcblocksize, n->nfile.fname);
8468 funcblocksize = calcsize(funcblocksize, n->nfile.next);
8472 funcblocksize = calcsize(funcblocksize, n->ndup.vname);
8473 funcblocksize = calcsize(funcblocksize, n->ndup.next);
8477 funcblocksize = calcsize(funcblocksize, n->nhere.doc);
8478 funcblocksize = calcsize(funcblocksize, n->nhere.next);
8481 funcblocksize = calcsize(funcblocksize, n->nnot.com);
8484 return funcblocksize;
8488 nodeckstrdup(char *s)
8490 funcstring_end -= SHELL_ALIGN(strlen(s) + 1);
8491 return strcpy(funcstring_end, s);
8494 static union node *copynode(union node *);
8496 static struct nodelist *
8497 copynodelist(struct nodelist *lp)
8499 struct nodelist *start;
8500 struct nodelist **lpp;
8505 funcblock = (char *) funcblock + SHELL_ALIGN(sizeof(struct nodelist));
8506 (*lpp)->n = copynode(lp->n);
8508 lpp = &(*lpp)->next;
8515 copynode(union node *n)
8522 funcblock = (char *) funcblock + nodesize[n->type];
8526 new->ncmd.redirect = copynode(n->ncmd.redirect);
8527 new->ncmd.args = copynode(n->ncmd.args);
8528 new->ncmd.assign = copynode(n->ncmd.assign);
8531 new->npipe.cmdlist = copynodelist(n->npipe.cmdlist);
8532 new->npipe.pipe_backgnd = n->npipe.pipe_backgnd;
8537 new->nredir.redirect = copynode(n->nredir.redirect);
8538 new->nredir.n = copynode(n->nredir.n);
8545 new->nbinary.ch2 = copynode(n->nbinary.ch2);
8546 new->nbinary.ch1 = copynode(n->nbinary.ch1);
8549 new->nif.elsepart = copynode(n->nif.elsepart);
8550 new->nif.ifpart = copynode(n->nif.ifpart);
8551 new->nif.test = copynode(n->nif.test);
8554 new->nfor.var = nodeckstrdup(n->nfor.var);
8555 new->nfor.body = copynode(n->nfor.body);
8556 new->nfor.args = copynode(n->nfor.args);
8559 new->ncase.cases = copynode(n->ncase.cases);
8560 new->ncase.expr = copynode(n->ncase.expr);
8563 new->nclist.body = copynode(n->nclist.body);
8564 new->nclist.pattern = copynode(n->nclist.pattern);
8565 new->nclist.next = copynode(n->nclist.next);
8569 new->narg.backquote = copynodelist(n->narg.backquote);
8570 new->narg.text = nodeckstrdup(n->narg.text);
8571 new->narg.next = copynode(n->narg.next);
8574 #if BASH_REDIR_OUTPUT
8581 new->nfile.fname = copynode(n->nfile.fname);
8582 new->nfile.fd = n->nfile.fd;
8583 new->nfile.next = copynode(n->nfile.next);
8587 new->ndup.vname = copynode(n->ndup.vname);
8588 new->ndup.dupfd = n->ndup.dupfd;
8589 new->ndup.fd = n->ndup.fd;
8590 new->ndup.next = copynode(n->ndup.next);
8594 new->nhere.doc = copynode(n->nhere.doc);
8595 new->nhere.fd = n->nhere.fd;
8596 new->nhere.next = copynode(n->nhere.next);
8599 new->nnot.com = copynode(n->nnot.com);
8602 new->type = n->type;
8607 * Make a copy of a parse tree.
8609 static struct funcnode *
8610 copyfunc(union node *n)
8615 /*funcstringsize = 0;*/
8616 blocksize = offsetof(struct funcnode, n) + calcsize(0, n);
8617 f = ckzalloc(blocksize /* + funcstringsize */);
8618 funcblock = (char *) f + offsetof(struct funcnode, n);
8619 funcstring_end = (char *) f + blocksize;
8621 /* f->count = 0; - ckzalloc did it */
8626 * Define a shell function.
8629 defun(union node *func)
8631 struct cmdentry entry;
8634 entry.cmdtype = CMDFUNCTION;
8635 entry.u.func = copyfunc(func);
8636 addcmdentry(func->narg.text, &entry);
8640 /* Reasons for skipping commands (see comment on breakcmd routine) */
8641 #define SKIPBREAK (1 << 0)
8642 #define SKIPCONT (1 << 1)
8643 #define SKIPFUNC (1 << 2)
8644 static smallint evalskip; /* set to SKIPxxx if we are skipping commands */
8645 static int skipcount; /* number of levels to skip */
8646 static int funcnest; /* depth of function calls */
8647 static int loopnest; /* current loop nesting level */
8649 /* Forward decl way out to parsing code - dotrap needs it */
8650 static int evalstring(char *s, int flags);
8652 /* Called to execute a trap.
8653 * Single callsite - at the end of evaltree().
8654 * If we return non-zero, evaltree raises EXEXIT exception.
8656 * Perhaps we should avoid entering new trap handlers
8657 * while we are executing a trap handler. [is it a TODO?]
8664 uint8_t last_status;
8669 last_status = exitstatus;
8673 TRACE(("dotrap entered\n"));
8674 for (sig = 1, g = gotsig; sig < NSIG; sig++, g++) {
8686 /* non-trapped SIGINT is handled separately by raise_interrupt,
8687 * don't upset it by resetting gotsig[SIGINT-1] */
8688 if (sig == SIGINT && !p)
8691 TRACE(("sig %d is active, will run handler '%s'\n", sig, p));
8697 exitstatus = last_status;
8698 TRACE(("dotrap returns\n"));
8701 /* forward declarations - evaluation is fairly recursive business... */
8702 static int evalloop(union node *, int);
8703 static int evalfor(union node *, int);
8704 static int evalcase(union node *, int);
8705 static int evalsubshell(union node *, int);
8706 static void expredir(union node *);
8707 static int evalpipe(union node *, int);
8708 static int evalcommand(union node *, int);
8709 static int evalbltin(const struct builtincmd *, int, char **, int);
8710 static void prehash(union node *);
8713 * Evaluate a parse tree. The value is left in the global variable
8717 evaltree(union node *n, int flags)
8720 int (*evalfn)(union node *, int);
8724 TRACE(("evaltree(NULL) called\n"));
8727 TRACE(("evaltree(%p: %d, %d) called\n", n, n->type, flags));
8734 out1fmt("Node type = %d\n", n->type);
8739 status = !evaltree(n->nnot.com, EV_TESTED);
8742 expredir(n->nredir.redirect);
8743 status = redirectsafe(n->nredir.redirect, REDIR_PUSH);
8745 status = evaltree(n->nredir.n, flags & EV_TESTED);
8747 if (n->nredir.redirect)
8748 popredir(/*drop:*/ 0, /*restore:*/ 0 /* not sure */);
8751 evalfn = evalcommand;
8753 if (eflag && !(flags & EV_TESTED))
8765 evalfn = evalsubshell;
8778 #error NAND + 1 != NOR
8780 #if NOR + 1 != NSEMI
8781 #error NOR + 1 != NSEMI
8783 unsigned is_or = n->type - NAND;
8786 (flags | ((is_or >> 1) - 1)) & EV_TESTED
8788 if ((!status) == is_or || evalskip)
8794 status = evalfn(n, flags);
8798 status = evaltree(n->nif.test, EV_TESTED);
8805 if (n->nif.elsepart) {
8806 n = n->nif.elsepart;
8813 /* Not necessary. To test it:
8814 * "false; f() { qwerty; }; echo $?" should print 0.
8818 exitstatus = status;
8822 /* Order of checks below is important:
8823 * signal handlers trigger before exit caused by "set -e".
8827 if (checkexit & status)
8828 raise_exception(EXEXIT);
8829 if (flags & EV_EXIT)
8830 raise_exception(EXEXIT);
8832 TRACE(("leaving evaltree (no interrupts)\n"));
8836 #if !defined(__alpha__) || (defined(__GNUC__) && __GNUC__ >= 3)
8839 int evaltreenr(union node *, int) __attribute__ ((alias("evaltree"),__noreturn__));
8844 int skip = evalskip;
8851 if (--skipcount <= 0) {
8862 evalloop(union node *n, int flags)
8873 i = evaltree(n->nbinary.ch1, EV_TESTED);
8875 if (skip == SKIPFUNC)
8879 if (n->type != NWHILE)
8883 status = evaltree(n->nbinary.ch2, flags);
8885 } while (!(skip & ~SKIPCONT));
8892 evalfor(union node *n, int flags)
8894 struct arglist arglist;
8897 struct stackmark smark;
8900 setstackmark(&smark);
8901 arglist.list = NULL;
8902 arglist.lastp = &arglist.list;
8903 for (argp = n->nfor.args; argp; argp = argp->narg.next) {
8904 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
8906 *arglist.lastp = NULL;
8910 for (sp = arglist.list; sp; sp = sp->next) {
8911 setvar0(n->nfor.var, sp->text);
8912 status = evaltree(n->nfor.body, flags);
8913 if (skiploop() & ~SKIPCONT)
8917 popstackmark(&smark);
8923 evalcase(union node *n, int flags)
8927 struct arglist arglist;
8928 struct stackmark smark;
8931 setstackmark(&smark);
8932 arglist.list = NULL;
8933 arglist.lastp = &arglist.list;
8934 expandarg(n->ncase.expr, &arglist, EXP_TILDE);
8935 for (cp = n->ncase.cases; cp && evalskip == 0; cp = cp->nclist.next) {
8936 for (patp = cp->nclist.pattern; patp; patp = patp->narg.next) {
8937 if (casematch(patp, arglist.list->text)) {
8938 /* Ensure body is non-empty as otherwise
8939 * EV_EXIT may prevent us from setting the
8942 if (evalskip == 0 && cp->nclist.body) {
8943 status = evaltree(cp->nclist.body, flags);
8950 popstackmark(&smark);
8956 * Kick off a subshell to evaluate a tree.
8959 evalsubshell(union node *n, int flags)
8962 int backgnd = (n->type == NBACKGND); /* FORK_BG(1) if yes, else FORK_FG(0) */
8965 expredir(n->nredir.redirect);
8966 if (!backgnd && (flags & EV_EXIT) && !may_have_traps)
8969 if (backgnd == FORK_FG)
8971 jp = makejob(/*n,*/ 1);
8972 if (forkshell(jp, n, backgnd) == 0) {
8977 flags &= ~EV_TESTED;
8979 redirect(n->nredir.redirect, 0);
8980 evaltreenr(n->nredir.n, flags);
8985 if (backgnd == FORK_FG)
8986 status = waitforjob(jp);
8992 * Compute the names of the files in a redirection list.
8994 static void fixredir(union node *, const char *, int);
8996 expredir(union node *n)
9000 for (redir = n; redir; redir = redir->nfile.next) {
9004 fn.lastp = &fn.list;
9005 switch (redir->type) {
9009 #if BASH_REDIR_OUTPUT
9014 expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR);
9015 TRACE(("expredir expanded to '%s'\n", fn.list->text));
9016 #if BASH_REDIR_OUTPUT
9020 // By the design of stack allocator, the loop of this kind:
9021 // while true; do while true; do break; done </dev/null; done
9022 // will look like a memory leak: ash plans to free expfname's
9023 // of "/dev/null" as soon as it finishes running the loop
9024 // (in this case, never).
9025 // This "fix" is wrong:
9026 if (redir->nfile.expfname)
9027 stunalloc(redir->nfile.expfname);
9028 // It results in corrupted state of stacked allocations.
9030 redir->nfile.expfname = fn.list->text;
9033 case NTOFD: /* >& */
9034 if (redir->ndup.vname) {
9035 expandarg(redir->ndup.vname, &fn, EXP_FULL | EXP_TILDE);
9036 if (fn.list == NULL)
9037 ash_msg_and_raise_error("redir error");
9038 #if BASH_REDIR_OUTPUT
9039 //FIXME: we used expandarg with different args!
9040 if (!isdigit_str9(fn.list->text)) {
9041 /* >&file, not >&fd */
9042 if (redir->nfile.fd != 1) /* 123>&file - BAD */
9043 ash_msg_and_raise_error("redir error");
9045 goto store_expfname;
9048 fixredir(redir, fn.list->text, 1);
9056 * Evaluate a pipeline. All the processes in the pipeline are children
9057 * of the process creating the pipeline. (This differs from some versions
9058 * of the shell, which make the last process in a pipeline the parent
9062 evalpipe(union node *n, int flags)
9065 struct nodelist *lp;
9071 TRACE(("evalpipe(0x%lx) called\n", (long)n));
9073 for (lp = n->npipe.cmdlist; lp; lp = lp->next)
9077 if (n->npipe.pipe_backgnd == 0)
9079 jp = makejob(/*n,*/ pipelen);
9081 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
9085 if (pipe(pip) < 0) {
9087 ash_msg_and_raise_error("pipe call failed");
9090 if (forkshell(jp, lp->n, n->npipe.pipe_backgnd) == 0) {
9104 evaltreenr(lp->n, flags);
9111 /* Don't want to trigger debugging */
9115 if (n->npipe.pipe_backgnd == 0) {
9116 status = waitforjob(jp);
9117 TRACE(("evalpipe: job done exit status %d\n", status));
9125 * Controls whether the shell is interactive or not.
9128 setinteractive(int on)
9130 static smallint is_interactive;
9132 if (++on == is_interactive)
9134 is_interactive = on;
9138 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
9139 if (is_interactive > 1) {
9140 /* Looks like they want an interactive shell */
9141 static smallint did_banner;
9144 /* note: ash and hush share this string */
9145 out1fmt("\n\n%s %s\n"
9146 IF_ASH_HELP("Enter 'help' for a list of built-in commands.\n")
9149 "built-in shell (ash)"
9163 setinteractive(iflag);
9165 #if ENABLE_FEATURE_EDITING_VI
9167 line_input_state->flags |= VI_MODE;
9169 line_input_state->flags &= ~VI_MODE;
9171 viflag = 0; /* forcibly keep the option off */
9175 static struct localvar *localvars;
9178 * Called after a function returns.
9179 * Interrupts must be off.
9184 struct localvar *lvp;
9187 while ((lvp = localvars) != NULL) {
9188 localvars = lvp->next;
9190 TRACE(("poplocalvar %s\n", vp ? vp->var_text : "-"));
9191 if (vp == NULL) { /* $- saved */
9192 memcpy(optlist, lvp->text, sizeof(optlist));
9193 free((char*)lvp->text);
9195 } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) {
9196 unsetvar(vp->var_text);
9199 vp->var_func(var_end(lvp->text));
9200 if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
9201 free((char*)vp->var_text);
9202 vp->flags = lvp->flags;
9203 vp->var_text = lvp->text;
9210 evalfun(struct funcnode *func, int argc, char **argv, int flags)
9212 volatile struct shparam saveparam;
9213 struct localvar *volatile savelocalvars;
9214 struct jmploc *volatile savehandler;
9215 struct jmploc jmploc;
9218 saveparam = shellparam;
9219 savelocalvars = localvars;
9220 savehandler = exception_handler;
9221 e = setjmp(jmploc.loc);
9226 exception_handler = &jmploc;
9228 shellparam.malloced = 0;
9232 shellparam.nparam = argc - 1;
9233 shellparam.p = argv + 1;
9234 #if ENABLE_ASH_GETOPTS
9235 shellparam.optind = 1;
9236 shellparam.optoff = -1;
9238 evaltree(func->n.narg.next, flags & EV_TESTED);
9244 localvars = savelocalvars;
9245 freeparam(&shellparam);
9246 shellparam = saveparam;
9247 exception_handler = savehandler;
9249 evalskip &= ~SKIPFUNC;
9254 * Make a variable a local variable. When a variable is made local, it's
9255 * value and flags are saved in a localvar structure. The saved values
9256 * will be restored when the shell function returns. We handle the name
9257 * "-" as a special case: it makes changes to "set +-options" local
9258 * (options will be restored on return from the function).
9263 struct localvar *lvp;
9266 char *eq = strchr(name, '=');
9269 /* Cater for duplicate "local". Examples:
9270 * x=0; f() { local x=1; echo $x; local x; echo $x; }; f; echo $x
9271 * x=0; f() { local x=1; echo $x; local x=2; echo $x; }; f; echo $x
9275 if (lvp->vp && varcmp(lvp->vp->var_text, name) == 0) {
9279 * it's a duplicate "local VAR" declaration, do nothing
9286 lvp = ckzalloc(sizeof(*lvp));
9287 if (LONE_DASH(name)) {
9289 p = ckmalloc(sizeof(optlist));
9290 lvp->text = memcpy(p, optlist, sizeof(optlist));
9293 vpp = hashvar(name);
9294 vp = *findvar(vpp, name);
9296 /* variable did not exist yet */
9298 setvareq(name, VSTRFIXED);
9300 setvar(name, NULL, VSTRFIXED);
9301 vp = *vpp; /* the new variable */
9302 lvp->flags = VUNSET;
9304 lvp->text = vp->var_text;
9305 lvp->flags = vp->flags;
9306 /* make sure neither "struct var" nor string gets freed
9307 * during (un)setting:
9309 vp->flags |= VSTRFIXED|VTEXTFIXED;
9313 /* "local VAR" unsets VAR: */
9314 setvar0(name, NULL);
9318 lvp->next = localvars;
9325 * The "local" command.
9327 static int FAST_FUNC
9328 localcmd(int argc UNUSED_PARAM, char **argv)
9333 ash_msg_and_raise_error("not in a function");
9336 while ((name = *argv++) != NULL) {
9342 static int FAST_FUNC
9343 falsecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
9348 static int FAST_FUNC
9349 truecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
9354 static int FAST_FUNC
9355 execcmd(int argc UNUSED_PARAM, char **argv)
9358 iflag = 0; /* exit on error */
9361 /* We should set up signals for "exec CMD"
9362 * the same way as for "CMD" without "exec".
9363 * But optschanged->setinteractive->setsignal
9364 * still thought we are a root shell. Therefore, for example,
9365 * SIGQUIT is still set to IGN. Fix it:
9369 /*setsignal(SIGTERM); - unnecessary because of iflag=0 */
9370 /*setsignal(SIGTSTP); - unnecessary because of mflag=0 */
9371 /*setsignal(SIGTTOU); - unnecessary because of mflag=0 */
9373 shellexec(argv[1], argv + 1, pathval(), 0);
9380 * The return command.
9382 static int FAST_FUNC
9383 returncmd(int argc UNUSED_PARAM, char **argv)
9386 * If called outside a function, do what ksh does;
9387 * skip the rest of the file.
9389 evalskip = SKIPFUNC;
9390 return argv[1] ? number(argv[1]) : exitstatus;
9393 /* Forward declarations for builtintab[] */
9394 static int breakcmd(int, char **) FAST_FUNC;
9395 static int dotcmd(int, char **) FAST_FUNC;
9396 static int evalcmd(int, char **, int) FAST_FUNC;
9397 static int exitcmd(int, char **) FAST_FUNC;
9398 static int exportcmd(int, char **) FAST_FUNC;
9399 #if ENABLE_ASH_GETOPTS
9400 static int getoptscmd(int, char **) FAST_FUNC;
9403 static int helpcmd(int, char **) FAST_FUNC;
9406 static int historycmd(int, char **) FAST_FUNC;
9408 #if ENABLE_FEATURE_SH_MATH
9409 static int letcmd(int, char **) FAST_FUNC;
9411 static int readcmd(int, char **) FAST_FUNC;
9412 static int setcmd(int, char **) FAST_FUNC;
9413 static int shiftcmd(int, char **) FAST_FUNC;
9414 static int timescmd(int, char **) FAST_FUNC;
9415 static int trapcmd(int, char **) FAST_FUNC;
9416 static int umaskcmd(int, char **) FAST_FUNC;
9417 static int unsetcmd(int, char **) FAST_FUNC;
9418 static int ulimitcmd(int, char **) FAST_FUNC;
9420 #define BUILTIN_NOSPEC "0"
9421 #define BUILTIN_SPECIAL "1"
9422 #define BUILTIN_REGULAR "2"
9423 #define BUILTIN_SPEC_REG "3"
9424 #define BUILTIN_ASSIGN "4"
9425 #define BUILTIN_SPEC_ASSG "5"
9426 #define BUILTIN_REG_ASSG "6"
9427 #define BUILTIN_SPEC_REG_ASSG "7"
9429 /* Stubs for calling non-FAST_FUNC's */
9431 static int FAST_FUNC echocmd(int argc, char **argv) { return echo_main(argc, argv); }
9433 #if ENABLE_ASH_PRINTF
9434 static int FAST_FUNC printfcmd(int argc, char **argv) { return printf_main(argc, argv); }
9436 #if ENABLE_ASH_TEST || BASH_TEST2
9437 static int FAST_FUNC testcmd(int argc, char **argv) { return test_main(argc, argv); }
9440 /* Keep these in proper order since it is searched via bsearch() */
9441 static const struct builtincmd builtintab[] = {
9442 { BUILTIN_SPEC_REG "." , dotcmd },
9443 { BUILTIN_SPEC_REG ":" , truecmd },
9445 { BUILTIN_REGULAR "[" , testcmd },
9448 { BUILTIN_REGULAR "[[" , testcmd },
9450 #if ENABLE_ASH_ALIAS
9451 { BUILTIN_REG_ASSG "alias" , aliascmd },
9454 { BUILTIN_REGULAR "bg" , fg_bgcmd },
9456 { BUILTIN_SPEC_REG "break" , breakcmd },
9457 { BUILTIN_REGULAR "cd" , cdcmd },
9458 { BUILTIN_NOSPEC "chdir" , cdcmd },
9459 #if ENABLE_ASH_CMDCMD
9460 { BUILTIN_REGULAR "command" , commandcmd },
9462 { BUILTIN_SPEC_REG "continue", breakcmd },
9464 { BUILTIN_REGULAR "echo" , echocmd },
9466 { BUILTIN_SPEC_REG "eval" , NULL }, /*evalcmd() has a differing prototype*/
9467 { BUILTIN_SPEC_REG "exec" , execcmd },
9468 { BUILTIN_SPEC_REG "exit" , exitcmd },
9469 { BUILTIN_SPEC_REG_ASSG "export" , exportcmd },
9470 { BUILTIN_REGULAR "false" , falsecmd },
9472 { BUILTIN_REGULAR "fg" , fg_bgcmd },
9474 #if ENABLE_ASH_GETOPTS
9475 { BUILTIN_REGULAR "getopts" , getoptscmd },
9477 { BUILTIN_NOSPEC "hash" , hashcmd },
9479 { BUILTIN_NOSPEC "help" , helpcmd },
9482 { BUILTIN_NOSPEC "history" , historycmd },
9485 { BUILTIN_REGULAR "jobs" , jobscmd },
9486 { BUILTIN_REGULAR "kill" , killcmd },
9488 #if ENABLE_FEATURE_SH_MATH
9489 { BUILTIN_NOSPEC "let" , letcmd },
9491 { BUILTIN_ASSIGN "local" , localcmd },
9492 #if ENABLE_ASH_PRINTF
9493 { BUILTIN_REGULAR "printf" , printfcmd },
9495 { BUILTIN_NOSPEC "pwd" , pwdcmd },
9496 { BUILTIN_REGULAR "read" , readcmd },
9497 { BUILTIN_SPEC_REG_ASSG "readonly", exportcmd },
9498 { BUILTIN_SPEC_REG "return" , returncmd },
9499 { BUILTIN_SPEC_REG "set" , setcmd },
9500 { BUILTIN_SPEC_REG "shift" , shiftcmd },
9502 { BUILTIN_SPEC_REG "source" , dotcmd },
9505 { BUILTIN_REGULAR "test" , testcmd },
9507 { BUILTIN_SPEC_REG "times" , timescmd },
9508 { BUILTIN_SPEC_REG "trap" , trapcmd },
9509 { BUILTIN_REGULAR "true" , truecmd },
9510 { BUILTIN_NOSPEC "type" , typecmd },
9511 { BUILTIN_NOSPEC "ulimit" , ulimitcmd },
9512 { BUILTIN_REGULAR "umask" , umaskcmd },
9513 #if ENABLE_ASH_ALIAS
9514 { BUILTIN_REGULAR "unalias" , unaliascmd },
9516 { BUILTIN_SPEC_REG "unset" , unsetcmd },
9517 { BUILTIN_REGULAR "wait" , waitcmd },
9520 /* Should match the above table! */
9521 #define COMMANDCMD (builtintab + \
9523 /* [ */ 1 * ENABLE_ASH_TEST + \
9524 /* [[ */ 1 * BASH_TEST2 + \
9525 /* alias */ 1 * ENABLE_ASH_ALIAS + \
9526 /* bg */ 1 * ENABLE_ASH_JOB_CONTROL + \
9527 /* break cd cddir */ 3)
9528 #define EVALCMD (COMMANDCMD + \
9529 /* command */ 1 * ENABLE_ASH_CMDCMD + \
9530 /* continue */ 1 + \
9531 /* echo */ 1 * ENABLE_ASH_ECHO + \
9533 #define EXECCMD (EVALCMD + \
9537 * Search the table of builtin commands.
9540 pstrcmp1(const void *a, const void *b)
9542 return strcmp((char*)a, *(char**)b + 1);
9544 static struct builtincmd *
9545 find_builtin(const char *name)
9547 struct builtincmd *bp;
9550 name, builtintab, ARRAY_SIZE(builtintab), sizeof(builtintab[0]),
9557 * Execute a simple command.
9560 isassignment(const char *p)
9562 const char *q = endofname(p);
9567 static int FAST_FUNC
9568 bltincmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
9570 /* Preserve exitstatus of a previous possible redirection
9571 * as POSIX mandates */
9572 return back_exitstatus;
9575 evalcommand(union node *cmd, int flags)
9577 static const struct builtincmd null_bltin = {
9578 "\0\0", bltincmd /* why three NULs? */
9580 struct stackmark smark;
9582 struct arglist arglist;
9583 struct arglist varlist;
9586 const struct strlist *sp;
9587 struct cmdentry cmdentry;
9594 struct builtincmd *bcmd;
9595 smallint cmd_is_exec;
9596 smallint pseudovarflag = 0;
9598 /* First expand the arguments. */
9599 TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags));
9600 setstackmark(&smark);
9601 back_exitstatus = 0;
9603 cmdentry.cmdtype = CMDBUILTIN;
9604 cmdentry.u.cmd = &null_bltin;
9605 varlist.lastp = &varlist.list;
9606 *varlist.lastp = NULL;
9607 arglist.lastp = &arglist.list;
9608 *arglist.lastp = NULL;
9611 if (cmd->ncmd.args) {
9612 bcmd = find_builtin(cmd->ncmd.args->narg.text);
9613 pseudovarflag = bcmd && IS_BUILTIN_ASSIGN(bcmd);
9616 for (argp = cmd->ncmd.args; argp; argp = argp->narg.next) {
9617 struct strlist **spp;
9619 spp = arglist.lastp;
9620 if (pseudovarflag && isassignment(argp->narg.text))
9621 expandarg(argp, &arglist, EXP_VARTILDE);
9623 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
9625 for (sp = *spp; sp; sp = sp->next)
9629 /* Reserve one extra spot at the front for shellexec. */
9630 nargv = stalloc(sizeof(char *) * (argc + 2));
9632 for (sp = arglist.list; sp; sp = sp->next) {
9633 TRACE(("evalcommand arg: %s\n", sp->text));
9634 *nargv++ = sp->text;
9639 if (iflag && funcnest == 0 && argc > 0)
9640 lastarg = nargv[-1];
9643 expredir(cmd->ncmd.redirect);
9644 status = redirectsafe(cmd->ncmd.redirect, REDIR_PUSH | REDIR_SAVEFD2);
9646 path = vpath.var_text;
9647 for (argp = cmd->ncmd.assign; argp; argp = argp->narg.next) {
9648 struct strlist **spp;
9651 spp = varlist.lastp;
9652 expandarg(argp, &varlist, EXP_VARTILDE);
9655 * Modify the command lookup path, if a PATH= assignment
9659 if (varcmp(p, path) == 0)
9663 /* Print the command if xflag is set. */
9666 const char *p = " %s" + 1;
9668 fdprintf(preverrout_fd, p, expandstr(ps4val()));
9670 for (n = 0; n < 2; n++) {
9672 fdprintf(preverrout_fd, p, sp->text);
9678 safe_write(preverrout_fd, "\n", 1);
9684 /* Now locate the command. */
9686 int cmd_flag = DO_ERR;
9687 #if ENABLE_ASH_CMDCMD
9688 const char *oldpath = path + 5;
9692 find_command(argv[0], &cmdentry, cmd_flag, path);
9693 if (cmdentry.cmdtype == CMDUNKNOWN) {
9694 flush_stdout_stderr();
9699 /* implement bltin and command here */
9700 if (cmdentry.cmdtype != CMDBUILTIN)
9703 spclbltin = IS_BUILTIN_SPECIAL(cmdentry.u.cmd);
9704 if (cmdentry.u.cmd == EXECCMD)
9706 #if ENABLE_ASH_CMDCMD
9707 if (cmdentry.u.cmd == COMMANDCMD) {
9709 nargv = parse_command_args(argv, &path);
9712 /* It's "command [-p] PROG ARGS" (that is, no -Vv).
9713 * nargv => "PROG". path is updated if -p.
9715 argc -= nargv - argv;
9717 cmd_flag |= DO_NOFUNC;
9726 exitstatus = status;
9728 /* We have a redirection error. */
9730 raise_exception(EXERROR);
9735 /* Execute the command. */
9736 switch (cmdentry.cmdtype) {
9739 #if ENABLE_FEATURE_SH_NOFORK
9740 /* (1) BUG: if variables are set, we need to fork, or save/restore them
9741 * around run_nofork_applet() call.
9742 * (2) Should this check also be done in forkshell()?
9743 * (perhaps it should, so that "VAR=VAL nofork" at least avoids exec...)
9745 /* find_command() encodes applet_no as (-2 - applet_no) */
9746 int applet_no = (- cmdentry.u.index - 2);
9747 if (applet_no >= 0 && APPLET_IS_NOFORK(applet_no)) {
9748 listsetvar(varlist.list, VEXPORT|VSTACK);
9749 /* run <applet>_main() */
9750 status = run_nofork_applet(applet_no, argv);
9754 /* Can we avoid forking off? For example, very last command
9755 * in a script or a subshell does not need forking,
9756 * we can just exec it.
9758 if (!(flags & EV_EXIT) || may_have_traps) {
9759 /* No, forking off a child is necessary */
9762 jp = makejob(/*cmd,*/ 1);
9763 if (forkshell(jp, cmd, FORK_FG) != 0) {
9765 status = waitforjob(jp);
9767 TRACE(("forked child exited with %d\n", status));
9772 /* fall through to exec'ing external program */
9774 listsetvar(varlist.list, VEXPORT|VSTACK);
9775 shellexec(argv[0], argv, path, cmdentry.u.index);
9779 cmdenviron = varlist.list;
9781 struct strlist *list = cmdenviron;
9783 if (spclbltin > 0 || argc == 0) {
9785 if (cmd_is_exec && argc > 1)
9788 listsetvar(list, i);
9790 /* Tight loop with builtins only:
9791 * "while kill -0 $child; do true; done"
9792 * will never exit even if $child died, unless we do this
9793 * to reap the zombie and make kill detect that it's gone: */
9794 dowait(DOWAIT_NONBLOCK, NULL);
9796 if (evalbltin(cmdentry.u.cmd, argc, argv, flags)) {
9797 if (exception_type == EXERROR && spclbltin <= 0) {
9802 longjmp(exception_handler->loc, 1);
9807 listsetvar(varlist.list, 0);
9808 /* See above for the rationale */
9809 dowait(DOWAIT_NONBLOCK, NULL);
9810 if (evalfun(cmdentry.u.func, argc, argv, flags))
9813 status = exitstatus;
9818 if (cmd->ncmd.redirect)
9819 popredir(/*drop:*/ cmd_is_exec, /*restore:*/ cmd_is_exec);
9821 /* dsl: I think this is intended to be used to support
9822 * '_' in 'vi' command mode during line editing...
9823 * However I implemented that within libedit itself.
9825 setvar0("_", lastarg);
9827 popstackmark(&smark);
9833 evalbltin(const struct builtincmd *cmd, int argc, char **argv, int flags)
9835 char *volatile savecmdname;
9836 struct jmploc *volatile savehandler;
9837 struct jmploc jmploc;
9841 savecmdname = commandname;
9842 savehandler = exception_handler;
9843 i = setjmp(jmploc.loc);
9846 exception_handler = &jmploc;
9847 commandname = argv[0];
9849 optptr = NULL; /* initialize nextopt */
9851 status = evalcmd(argc, argv, flags);
9853 status = (*cmd->builtin)(argc, argv);
9854 flush_stdout_stderr();
9855 status |= ferror(stdout);
9856 exitstatus = status;
9859 commandname = savecmdname;
9860 exception_handler = savehandler;
9866 goodname(const char *p)
9868 return endofname(p)[0] == '\0';
9873 * Search for a command. This is called before we fork so that the
9874 * location of the command will be available in the parent as well as
9875 * the child. The check for "goodname" is an overly conservative
9876 * check that the name will not be subject to expansion.
9879 prehash(union node *n)
9881 struct cmdentry entry;
9883 if (n->type == NCMD && n->ncmd.args && goodname(n->ncmd.args->narg.text))
9884 find_command(n->ncmd.args->narg.text, &entry, 0, pathval());
9888 /* ============ Builtin commands
9890 * Builtin commands whose functions are closely tied to evaluation
9891 * are implemented here.
9895 * Handle break and continue commands. Break, continue, and return are
9896 * all handled by setting the evalskip flag. The evaluation routines
9897 * above all check this flag, and if it is set they start skipping
9898 * commands rather than executing them. The variable skipcount is
9899 * the number of loops to break/continue, or the number of function
9900 * levels to return. (The latter is always 1.) It should probably
9901 * be an error to break out of more loops than exist, but it isn't
9902 * in the standard shell so we don't make it one here.
9904 static int FAST_FUNC
9905 breakcmd(int argc UNUSED_PARAM, char **argv)
9907 int n = argv[1] ? number(argv[1]) : 1;
9910 ash_msg_and_raise_error(msg_illnum, argv[1]);
9914 evalskip = (**argv == 'c') ? SKIPCONT : SKIPBREAK;
9922 * This implements the input routines used by the parser.
9926 INPUT_PUSH_FILE = 1,
9927 INPUT_NOFILE_OK = 2,
9930 static smallint checkkwd;
9931 /* values of checkkwd variable */
9932 #define CHKALIAS 0x1
9937 * Push a string back onto the input at this current parsefile level.
9938 * We handle aliases this way.
9940 #if !ENABLE_ASH_ALIAS
9941 #define pushstring(s, ap) pushstring(s)
9944 pushstring(char *s, struct alias *ap)
9951 if (g_parsefile->strpush) {
9952 sp = ckzalloc(sizeof(*sp));
9953 sp->prev = g_parsefile->strpush;
9955 sp = &(g_parsefile->basestrpush);
9957 g_parsefile->strpush = sp;
9958 sp->prev_string = g_parsefile->next_to_pgetc;
9959 sp->prev_left_in_line = g_parsefile->left_in_line;
9960 sp->unget = g_parsefile->unget;
9961 memcpy(sp->lastc, g_parsefile->lastc, sizeof(sp->lastc));
9962 #if ENABLE_ASH_ALIAS
9965 ap->flag |= ALIASINUSE;
9969 g_parsefile->next_to_pgetc = s;
9970 g_parsefile->left_in_line = len;
9971 g_parsefile->unget = 0;
9978 struct strpush *sp = g_parsefile->strpush;
9981 #if ENABLE_ASH_ALIAS
9983 if (g_parsefile->next_to_pgetc[-1] == ' '
9984 || g_parsefile->next_to_pgetc[-1] == '\t'
9986 checkkwd |= CHKALIAS;
9988 if (sp->string != sp->ap->val) {
9991 sp->ap->flag &= ~ALIASINUSE;
9992 if (sp->ap->flag & ALIASDEAD) {
9993 unalias(sp->ap->name);
9997 g_parsefile->next_to_pgetc = sp->prev_string;
9998 g_parsefile->left_in_line = sp->prev_left_in_line;
9999 g_parsefile->unget = sp->unget;
10000 memcpy(g_parsefile->lastc, sp->lastc, sizeof(sp->lastc));
10001 g_parsefile->strpush = sp->prev;
10002 if (sp != &(g_parsefile->basestrpush))
10011 char *buf = g_parsefile->buf;
10013 g_parsefile->next_to_pgetc = buf;
10014 #if ENABLE_FEATURE_EDITING
10016 if (!iflag || g_parsefile->pf_fd != STDIN_FILENO)
10017 nr = nonblock_immune_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1);
10020 # if ENABLE_ASH_IDLE_TIMEOUT
10022 const char *tmout_var = lookupvar("TMOUT");
10024 timeout = atoi(tmout_var) * 1000;
10030 # if ENABLE_FEATURE_TAB_COMPLETION
10031 line_input_state->path_lookup = pathval();
10033 reinit_unicode_for_ash();
10034 nr = read_line_input(line_input_state, cmdedit_prompt, buf, IBUFSIZ, timeout);
10036 /* ^C pressed, "convert" to SIGINT */
10037 write(STDOUT_FILENO, "^C", 2);
10038 if (trap[SIGINT]) {
10044 exitstatus = 128 + SIGINT;
10050 /* Ctrl+D pressed */
10053 # if ENABLE_ASH_IDLE_TIMEOUT
10054 else if (errno == EAGAIN && timeout > 0) {
10055 puts("\007timed out waiting for input: auto-logout");
10062 nr = nonblock_immune_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1);
10065 #if 0 /* disabled: nonblock_immune_read() handles this problem */
10067 if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
10068 int flags = fcntl(0, F_GETFL);
10069 if (flags >= 0 && (flags & O_NONBLOCK)) {
10070 flags &= ~O_NONBLOCK;
10071 if (fcntl(0, F_SETFL, flags) >= 0) {
10072 out2str("sh: turning off NDELAY mode\n");
10083 * Refill the input buffer and return the next input character:
10085 * 1) If a string was pushed back on the input, pop it;
10086 * 2) If an EOF was pushed back (g_parsefile->left_in_line < -BIGNUM)
10087 * or we are reading from a string so we can't refill the buffer,
10089 * 3) If there is more stuff in this buffer, use it else call read to fill it.
10090 * 4) Process input up to the next newline, deleting nul characters.
10092 //#define pgetc_debug(...) bb_error_msg(__VA_ARGS__)
10093 #define pgetc_debug(...) ((void)0)
10094 static int pgetc(void);
10101 if (g_parsefile->strpush) {
10102 #if ENABLE_ASH_ALIAS
10103 if (g_parsefile->left_in_line == -1
10104 && g_parsefile->strpush->ap
10105 && g_parsefile->next_to_pgetc[-1] != ' '
10106 && g_parsefile->next_to_pgetc[-1] != '\t'
10108 pgetc_debug("preadbuffer PEOA");
10115 /* on both branches above g_parsefile->left_in_line < 0.
10116 * "pgetc" needs refilling.
10119 /* -90 is our -BIGNUM. Below we use -99 to mark "EOF on read",
10120 * pungetc() may increment it a few times.
10121 * Assuming it won't increment it to less than -90.
10123 if (g_parsefile->left_in_line < -90 || g_parsefile->buf == NULL) {
10124 pgetc_debug("preadbuffer PEOF1");
10125 /* even in failure keep left_in_line and next_to_pgetc
10126 * in lock step, for correct multi-layer pungetc.
10127 * left_in_line was decremented before preadbuffer(),
10128 * must inc next_to_pgetc: */
10129 g_parsefile->next_to_pgetc++;
10133 more = g_parsefile->left_in_buffer;
10135 flush_stdout_stderr();
10139 /* don't try reading again */
10140 g_parsefile->left_in_line = -99;
10141 pgetc_debug("preadbuffer PEOF2");
10142 g_parsefile->next_to_pgetc++;
10147 /* Find out where's the end of line.
10148 * Set g_parsefile->left_in_line
10149 * and g_parsefile->left_in_buffer acordingly.
10150 * NUL chars are deleted.
10152 q = g_parsefile->next_to_pgetc;
10160 memmove(q, q + 1, more);
10164 g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1;
10170 g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1;
10171 if (g_parsefile->left_in_line < 0)
10176 g_parsefile->left_in_buffer = more;
10181 out2str(g_parsefile->next_to_pgetc);
10185 pgetc_debug("preadbuffer at %d:%p'%s'",
10186 g_parsefile->left_in_line,
10187 g_parsefile->next_to_pgetc,
10188 g_parsefile->next_to_pgetc);
10189 return (unsigned char)*g_parsefile->next_to_pgetc++;
10195 g_parsefile->linno++;
10196 setprompt_if(doprompt, 2);
10201 g_parsefile->linno++;
10202 needprompt = doprompt;
10210 pgetc_debug("pgetc at %d:%p'%s'",
10211 g_parsefile->left_in_line,
10212 g_parsefile->next_to_pgetc,
10213 g_parsefile->next_to_pgetc);
10214 if (g_parsefile->unget)
10215 return g_parsefile->lastc[--g_parsefile->unget];
10217 if (--g_parsefile->left_in_line >= 0)
10218 c = (unsigned char)*g_parsefile->next_to_pgetc++;
10222 g_parsefile->lastc[1] = g_parsefile->lastc[0];
10223 g_parsefile->lastc[0] = c;
10228 #if ENABLE_ASH_ALIAS
10230 pgetc_without_PEOA(void)
10234 pgetc_debug("pgetc at %d:%p'%s'",
10235 g_parsefile->left_in_line,
10236 g_parsefile->next_to_pgetc,
10237 g_parsefile->next_to_pgetc);
10239 } while (c == PEOA);
10243 # define pgetc_without_PEOA() pgetc()
10247 * Read a line from the script.
10250 pfgets(char *line, int len)
10256 while (--nleft > 0) {
10257 c = pgetc_without_PEOA();
10272 * Undo a call to pgetc. Only two characters may be pushed back.
10273 * PEOF may be pushed back.
10278 g_parsefile->unget++;
10281 /* This one eats backslash+newline */
10287 while ((c = pgetc()) == '\\') {
10288 if (pgetc() != '\n') {
10300 * To handle the "." command, a stack of input files is used. Pushfile
10301 * adds a new entry to the stack and popfile restores the previous level.
10306 struct parsefile *pf;
10308 pf = ckzalloc(sizeof(*pf));
10309 pf->prev = g_parsefile;
10311 /*pf->strpush = NULL; - ckzalloc did it */
10312 /*pf->basestrpush.prev = NULL;*/
10320 struct parsefile *pf = g_parsefile;
10326 if (pf->pf_fd >= 0)
10329 while (pf->strpush)
10331 g_parsefile = pf->prev;
10337 * Return to top level.
10342 while (g_parsefile != &basepf)
10347 * Close the file(s) that the shell is reading commands from. Called
10348 * after a fork is done.
10354 if (g_parsefile->pf_fd > 0) {
10355 close(g_parsefile->pf_fd);
10356 g_parsefile->pf_fd = 0;
10361 * Like setinputfile, but takes an open file descriptor. Call this with
10365 setinputfd(int fd, int push)
10369 g_parsefile->buf = NULL;
10371 g_parsefile->pf_fd = fd;
10372 if (g_parsefile->buf == NULL)
10373 g_parsefile->buf = ckmalloc(IBUFSIZ);
10374 g_parsefile->left_in_buffer = 0;
10375 g_parsefile->left_in_line = 0;
10376 g_parsefile->linno = 1;
10380 * Set the input to take input from a file. If push is set, push the
10381 * old input onto the stack first.
10384 setinputfile(const char *fname, int flags)
10389 fd = open(fname, O_RDONLY);
10391 if (flags & INPUT_NOFILE_OK)
10394 ash_msg_and_raise_error("can't open '%s'", fname);
10399 close_on_exec_on(fd);
10400 setinputfd(fd, flags & INPUT_PUSH_FILE);
10407 * Like setinputfile, but takes input from a string.
10410 setinputstring(char *string)
10414 g_parsefile->next_to_pgetc = string;
10415 g_parsefile->left_in_line = strlen(string);
10416 g_parsefile->buf = NULL;
10417 g_parsefile->linno = 1;
10423 * Routines to check for mail.
10426 #if ENABLE_ASH_MAIL
10428 /* Hash of mtimes of mailboxes */
10429 static unsigned mailtime_hash;
10430 /* Set if MAIL or MAILPATH is changed. */
10431 static smallint mail_var_path_changed;
10434 * Print appropriate message(s) if mail has arrived.
10435 * If mail_var_path_changed is set,
10436 * then the value of MAIL has mail_var_path_changed,
10437 * so we just update the values.
10446 struct stackmark smark;
10449 setstackmark(&smark);
10450 mpath = mpathset() ? mpathval() : mailval();
10453 p = path_advance(&mpath, nullstr);
10458 for (q = p; *q; q++)
10464 q[-1] = '\0'; /* delete trailing '/' */
10465 if (stat(p, &statb) < 0) {
10468 /* Very simplistic "hash": just a sum of all mtimes */
10469 new_hash += (unsigned)statb.st_mtime;
10471 if (!mail_var_path_changed && mailtime_hash != new_hash) {
10472 if (mailtime_hash != 0)
10473 out2str("you have mail\n");
10474 mailtime_hash = new_hash;
10476 mail_var_path_changed = 0;
10477 popstackmark(&smark);
10480 static void FAST_FUNC
10481 changemail(const char *val UNUSED_PARAM)
10483 mail_var_path_changed = 1;
10486 #endif /* ASH_MAIL */
10489 /* ============ ??? */
10492 * Set the shell parameters.
10495 setparam(char **argv)
10501 for (nparam = 0; argv[nparam]; nparam++)
10503 ap = newparam = ckmalloc((nparam + 1) * sizeof(*ap));
10505 *ap++ = ckstrdup(*argv++);
10508 freeparam(&shellparam);
10509 shellparam.malloced = 1;
10510 shellparam.nparam = nparam;
10511 shellparam.p = newparam;
10512 #if ENABLE_ASH_GETOPTS
10513 shellparam.optind = 1;
10514 shellparam.optoff = -1;
10519 * Process shell options. The global variable argptr contains a pointer
10520 * to the argument list; we advance it past the options.
10522 * SUSv3 section 2.8.1 "Consequences of Shell Errors" says:
10523 * For a non-interactive shell, an error condition encountered
10524 * by a special built-in ... shall cause the shell to write a diagnostic message
10525 * to standard error and exit as shown in the following table:
10526 * Error Special Built-In
10528 * Utility syntax error (option or operand error) Shall exit
10530 * However, in bug 1142 (http://busybox.net/bugs/view.php?id=1142)
10531 * we see that bash does not do that (set "finishes" with error code 1 instead,
10532 * and shell continues), and people rely on this behavior!
10534 * set -o barfoo 2>/dev/null
10537 * Oh well. Let's mimic that.
10540 plus_minus_o(char *name, int val)
10545 for (i = 0; i < NOPTS; i++) {
10546 if (strcmp(name, optnames(i)) == 0) {
10551 ash_msg("illegal option %co %s", val ? '-' : '+', name);
10554 for (i = 0; i < NOPTS; i++) {
10556 out1fmt("%-16s%s\n", optnames(i), optlist[i] ? "on" : "off");
10558 out1fmt("set %co %s\n", optlist[i] ? '-' : '+', optnames(i));
10564 setoption(int flag, int val)
10568 for (i = 0; i < NOPTS; i++) {
10569 if (optletters(i) == flag) {
10574 ash_msg_and_raise_error("illegal option %c%c", val ? '-' : '+', flag);
10578 options(int cmdline)
10586 while ((p = *argptr) != NULL) {
10588 if (c != '-' && c != '+')
10591 val = 0; /* val = 0 if c == '+' */
10594 if (p[0] == '\0' || LONE_DASH(p)) {
10596 /* "-" means turn off -x and -v */
10599 /* "--" means reset params */
10600 else if (*argptr == NULL)
10603 break; /* "-" or "--" terminates options */
10606 /* first char was + or - */
10607 while ((c = *p++) != '\0') {
10608 /* bash 3.2 indeed handles -c CMD and +c CMD the same */
10609 if (c == 'c' && cmdline) {
10610 minusc = p; /* command is after shell args */
10611 } else if (c == 'o') {
10612 if (plus_minus_o(*argptr, val)) {
10613 /* it already printed err message */
10614 return 1; /* error */
10618 } else if (cmdline && (c == 'l')) { /* -l or +l == --login */
10620 /* bash does not accept +-login, we also won't */
10621 } else if (cmdline && val && (c == '-')) { /* long options */
10622 if (strcmp(p, "login") == 0)
10634 * The shift builtin command.
10636 static int FAST_FUNC
10637 shiftcmd(int argc UNUSED_PARAM, char **argv)
10644 n = number(argv[1]);
10645 if (n > shellparam.nparam)
10646 n = 0; /* bash compat, was = shellparam.nparam; */
10648 shellparam.nparam -= n;
10649 for (ap1 = shellparam.p; --n >= 0; ap1++) {
10650 if (shellparam.malloced)
10653 ap2 = shellparam.p;
10654 while ((*ap2++ = *ap1++) != NULL)
10656 #if ENABLE_ASH_GETOPTS
10657 shellparam.optind = 1;
10658 shellparam.optoff = -1;
10665 * POSIX requires that 'set' (but not export or readonly) output the
10666 * variables in lexicographic order - by the locale's collating order (sigh).
10667 * Maybe we could keep them in an ordered balanced binary tree
10668 * instead of hashed lists.
10669 * For now just roll 'em through qsort for printing...
10672 showvars(const char *sep_prefix, int on, int off)
10675 char **ep, **epend;
10677 ep = listvars(on, off, &epend);
10678 qsort(ep, epend - ep, sizeof(char *), vpcmp);
10680 sep = *sep_prefix ? " " : sep_prefix;
10682 for (; ep < epend; ep++) {
10686 p = strchrnul(*ep, '=');
10689 q = single_quote(++p);
10690 out1fmt("%s%s%.*s%s\n", sep_prefix, sep, (int)(p - *ep), *ep, q);
10696 * The set command builtin.
10698 static int FAST_FUNC
10699 setcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
10704 return showvars(nullstr, 0, VUNSET);
10707 retval = options(/*cmdline:*/ 0);
10708 if (retval == 0) { /* if no parse error... */
10710 if (*argptr != NULL) {
10718 #if ENABLE_ASH_RANDOM_SUPPORT
10719 static void FAST_FUNC
10720 change_random(const char *value)
10724 if (value == NULL) {
10725 /* "get", generate */
10726 t = next_random(&random_gen);
10727 /* set without recursion */
10728 setvar(vrandom.var_text, utoa(t), VNOFUNC);
10729 vrandom.flags &= ~VNOFUNC;
10732 t = strtoul(value, NULL, 10);
10733 INIT_RANDOM_T(&random_gen, (t ? t : 1), t);
10738 #if ENABLE_ASH_GETOPTS
10740 getopts(char *optstr, char *optvar, char **optfirst)
10747 int ind = shellparam.optind;
10748 int off = shellparam.optoff;
10752 shellparam.optind = -1;
10753 optnext = optfirst + ind - 1;
10755 if (ind <= 1 || off < 0 || (int)strlen(optnext[-1]) < off)
10758 p = optnext[-1] + off;
10759 if (p == NULL || *p == '\0') {
10760 /* Current word is done, advance */
10762 if (p == NULL || *p != '-' || *++p == '\0') {
10769 if (LONE_DASH(p)) /* check for "--" */
10774 for (q = optstr; *q != c;) {
10776 if (optstr[0] == ':') {
10778 /*sbuf[1] = '\0'; - already is */
10779 setvar0("OPTARG", sbuf);
10781 fprintf(stderr, "Illegal option -%c\n", c);
10782 unsetvar("OPTARG");
10792 if (*p == '\0' && (p = *optnext) == NULL) {
10793 if (optstr[0] == ':') {
10795 /*sbuf[1] = '\0'; - already is */
10796 setvar0("OPTARG", sbuf);
10799 fprintf(stderr, "No arg for -%c option\n", c);
10800 unsetvar("OPTARG");
10808 setvar0("OPTARG", p);
10811 setvar0("OPTARG", nullstr);
10813 ind = optnext - optfirst + 1;
10814 setvar("OPTIND", itoa(ind), VNOFUNC);
10816 /*sbuf[1] = '\0'; - already is */
10817 setvar0(optvar, sbuf);
10819 shellparam.optoff = p ? p - *(optnext - 1) : -1;
10820 shellparam.optind = ind;
10826 * The getopts builtin. Shellparam.optnext points to the next argument
10827 * to be processed. Shellparam.optptr points to the next character to
10828 * be processed in the current argument. If shellparam.optnext is NULL,
10829 * then it's the first time getopts has been called.
10831 static int FAST_FUNC
10832 getoptscmd(int argc, char **argv)
10837 ash_msg_and_raise_error("usage: getopts optstring var [arg]");
10839 optbase = shellparam.p;
10840 if ((unsigned)shellparam.optind > shellparam.nparam + 1) {
10841 shellparam.optind = 1;
10842 shellparam.optoff = -1;
10845 optbase = &argv[3];
10846 if ((unsigned)shellparam.optind > argc - 2) {
10847 shellparam.optind = 1;
10848 shellparam.optoff = -1;
10852 return getopts(argv[1], argv[2], optbase);
10854 #endif /* ASH_GETOPTS */
10857 /* ============ Shell parser */
10860 struct heredoc *next; /* next here document in list */
10861 union node *here; /* redirection node */
10862 char *eofmark; /* string indicating end of input */
10863 smallint striptabs; /* if set, strip leading tabs */
10866 static smallint tokpushback; /* last token pushed back */
10867 static smallint quoteflag; /* set if (part of) last token was quoted */
10868 static token_id_t lasttoken; /* last token read (integer id Txxx) */
10869 static struct heredoc *heredoclist; /* list of here documents to read */
10870 static char *wordtext; /* text of last word returned by readtoken */
10871 static struct nodelist *backquotelist;
10872 static union node *redirnode;
10873 static struct heredoc *heredoc;
10875 static const char *
10876 tokname(char *buf, int tok)
10879 return tokname_array[tok];
10880 sprintf(buf, "\"%s\"", tokname_array[tok]);
10884 /* raise_error_unexpected_syntax:
10885 * Called when an unexpected token is read during the parse. The argument
10886 * is the token that is expected, or -1 if more than one type of token can
10887 * occur at this point.
10889 static void raise_error_unexpected_syntax(int) NORETURN;
10891 raise_error_unexpected_syntax(int token)
10897 l = sprintf(msg, "unexpected %s", tokname(buf, lasttoken));
10899 sprintf(msg + l, " (expecting %s)", tokname(buf, token));
10900 raise_error_syntax(msg);
10904 #define EOFMARKLEN 79
10906 /* parsing is heavily cross-recursive, need these forward decls */
10907 static union node *andor(void);
10908 static union node *pipeline(void);
10909 static union node *parse_command(void);
10910 static void parseheredoc(void);
10911 static int peektoken(void);
10912 static int readtoken(void);
10914 static union node *
10917 union node *n1, *n2, *n3;
10922 switch (peektoken()) {
10930 if (!n1 && (nlflag & 1))
10936 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10937 if (nlflag == 2 && ((1 << peektoken()) & tokendlist))
10943 if (tok == TBACKGND) {
10944 if (n2->type == NPIPE) {
10945 n2->npipe.pipe_backgnd = 1;
10947 if (n2->type != NREDIR) {
10948 n3 = stzalloc(sizeof(struct nredir));
10950 /*n3->nredir.redirect = NULL; - stzalloc did it */
10953 n2->type = NBACKGND;
10959 n3 = stzalloc(sizeof(struct nbinary));
10961 n3->nbinary.ch1 = n1;
10962 n3->nbinary.ch2 = n2;
10975 raise_error_unexpected_syntax(-1);
10982 static union node *
10985 union node *n1, *n2, *n3;
10993 } else if (t == TOR) {
10999 checkkwd = CHKNL | CHKKWD | CHKALIAS;
11001 n3 = stzalloc(sizeof(struct nbinary));
11003 n3->nbinary.ch1 = n1;
11004 n3->nbinary.ch2 = n2;
11009 static union node *
11012 union node *n1, *n2, *pipenode;
11013 struct nodelist *lp, *prev;
11017 TRACE(("pipeline: entered\n"));
11018 if (readtoken() == TNOT) {
11020 checkkwd = CHKKWD | CHKALIAS;
11023 n1 = parse_command();
11024 if (readtoken() == TPIPE) {
11025 pipenode = stzalloc(sizeof(struct npipe));
11026 pipenode->type = NPIPE;
11027 /*pipenode->npipe.pipe_backgnd = 0; - stzalloc did it */
11028 lp = stzalloc(sizeof(struct nodelist));
11029 pipenode->npipe.cmdlist = lp;
11033 lp = stzalloc(sizeof(struct nodelist));
11034 checkkwd = CHKNL | CHKKWD | CHKALIAS;
11035 lp->n = parse_command();
11037 } while (readtoken() == TPIPE);
11043 n2 = stzalloc(sizeof(struct nnot));
11051 static union node *
11056 n = stzalloc(sizeof(struct narg));
11058 /*n->narg.next = NULL; - stzalloc did it */
11059 n->narg.text = wordtext;
11060 n->narg.backquote = backquotelist;
11065 fixredir(union node *n, const char *text, int err)
11069 TRACE(("Fix redir %s %d\n", text, err));
11071 n->ndup.vname = NULL;
11073 fd = bb_strtou(text, NULL, 10);
11074 if (!errno && fd >= 0)
11075 n->ndup.dupfd = fd;
11076 else if (LONE_DASH(text))
11077 n->ndup.dupfd = -1;
11080 raise_error_syntax("bad fd number");
11081 n->ndup.vname = makename();
11086 * Returns true if the text contains nothing to expand (no dollar signs
11090 noexpand(const char *text)
11094 while ((c = *text++) != '\0') {
11095 if (c == CTLQUOTEMARK)
11099 else if (SIT(c, BASESYNTAX) == CCTL)
11108 union node *n = redirnode;
11110 if (readtoken() != TWORD)
11111 raise_error_unexpected_syntax(-1);
11112 if (n->type == NHERE) {
11113 struct heredoc *here = heredoc;
11117 if (quoteflag == 0)
11119 TRACE(("Here document %d\n", n->type));
11120 if (!noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN)
11121 raise_error_syntax("illegal eof marker for << redirection");
11122 rmescapes(wordtext, 0);
11123 here->eofmark = wordtext;
11125 if (heredoclist == NULL)
11126 heredoclist = here;
11128 for (p = heredoclist; p->next; p = p->next)
11132 } else if (n->type == NTOFD || n->type == NFROMFD) {
11133 fixredir(n, wordtext, 0);
11135 n->nfile.fname = makename();
11139 static union node *
11142 union node *args, **app;
11143 union node *n = NULL;
11144 union node *vars, **vpp;
11145 union node **rpp, *redir;
11148 smallint double_brackets_flag = 0;
11150 IF_BASH_FUNCTION(smallint function_flag = 0;)
11159 savecheckkwd = CHKALIAS;
11162 checkkwd = savecheckkwd;
11167 if (peektoken() != TWORD)
11168 raise_error_unexpected_syntax(TWORD);
11173 case TAND: /* "&&" */
11174 case TOR: /* "||" */
11175 if (!double_brackets_flag) {
11179 wordtext = (char *) (t == TAND ? "-a" : "-o");
11182 n = stzalloc(sizeof(struct narg));
11184 /*n->narg.next = NULL; - stzalloc did it */
11185 n->narg.text = wordtext;
11187 if (strcmp("[[", wordtext) == 0)
11188 double_brackets_flag = 1;
11189 else if (strcmp("]]", wordtext) == 0)
11190 double_brackets_flag = 0;
11192 n->narg.backquote = backquotelist;
11193 if (savecheckkwd && isassignment(wordtext)) {
11195 vpp = &n->narg.next;
11198 app = &n->narg.next;
11202 if (function_flag) {
11203 checkkwd = CHKNL | CHKKWD;
11204 switch (peektoken()) {
11216 if (strcmp("[[", wordtext) == 0)
11220 raise_error_unexpected_syntax(-1);
11226 *rpp = n = redirnode;
11227 rpp = &n->nfile.next;
11228 parsefname(); /* read name of redirection file */
11231 IF_BASH_FUNCTION(do_func:)
11232 if (args && app == &args->narg.next
11235 struct builtincmd *bcmd;
11238 /* We have a function */
11239 if (IF_BASH_FUNCTION(!function_flag &&) readtoken() != TRP)
11240 raise_error_unexpected_syntax(TRP);
11241 name = n->narg.text;
11242 if (!goodname(name)
11243 || ((bcmd = find_builtin(name)) && IS_BUILTIN_SPECIAL(bcmd))
11245 raise_error_syntax("bad function name");
11248 checkkwd = CHKNL | CHKKWD | CHKALIAS;
11249 n->narg.next = parse_command();
11252 IF_BASH_FUNCTION(function_flag = 0;)
11263 n = stzalloc(sizeof(struct ncmd));
11265 n->ncmd.args = args;
11266 n->ncmd.assign = vars;
11267 n->ncmd.redirect = redir;
11271 static union node *
11272 parse_command(void)
11274 union node *n1, *n2;
11275 union node *ap, **app;
11276 union node *cp, **cpp;
11277 union node *redir, **rpp;
11284 switch (readtoken()) {
11286 raise_error_unexpected_syntax(-1);
11289 n1 = stzalloc(sizeof(struct nif));
11291 n1->nif.test = list(0);
11292 if (readtoken() != TTHEN)
11293 raise_error_unexpected_syntax(TTHEN);
11294 n1->nif.ifpart = list(0);
11296 while (readtoken() == TELIF) {
11297 n2->nif.elsepart = stzalloc(sizeof(struct nif));
11298 n2 = n2->nif.elsepart;
11300 n2->nif.test = list(0);
11301 if (readtoken() != TTHEN)
11302 raise_error_unexpected_syntax(TTHEN);
11303 n2->nif.ifpart = list(0);
11305 if (lasttoken == TELSE)
11306 n2->nif.elsepart = list(0);
11308 n2->nif.elsepart = NULL;
11316 n1 = stzalloc(sizeof(struct nbinary));
11317 n1->type = (lasttoken == TWHILE) ? NWHILE : NUNTIL;
11318 n1->nbinary.ch1 = list(0);
11321 TRACE(("expecting DO got '%s' %s\n", tokname_array[got],
11322 got == TWORD ? wordtext : ""));
11323 raise_error_unexpected_syntax(TDO);
11325 n1->nbinary.ch2 = list(0);
11330 if (readtoken() != TWORD || quoteflag || !goodname(wordtext))
11331 raise_error_syntax("bad for loop variable");
11332 n1 = stzalloc(sizeof(struct nfor));
11334 n1->nfor.var = wordtext;
11335 checkkwd = CHKNL | CHKKWD | CHKALIAS;
11336 if (readtoken() == TIN) {
11338 while (readtoken() == TWORD) {
11339 n2 = stzalloc(sizeof(struct narg));
11341 /*n2->narg.next = NULL; - stzalloc did it */
11342 n2->narg.text = wordtext;
11343 n2->narg.backquote = backquotelist;
11345 app = &n2->narg.next;
11348 n1->nfor.args = ap;
11349 if (lasttoken != TNL && lasttoken != TSEMI)
11350 raise_error_unexpected_syntax(-1);
11352 n2 = stzalloc(sizeof(struct narg));
11354 /*n2->narg.next = NULL; - stzalloc did it */
11355 n2->narg.text = (char *)dolatstr;
11356 /*n2->narg.backquote = NULL;*/
11357 n1->nfor.args = n2;
11359 * Newline or semicolon here is optional (but note
11360 * that the original Bourne shell only allowed NL).
11362 if (lasttoken != TSEMI)
11365 checkkwd = CHKNL | CHKKWD | CHKALIAS;
11366 if (readtoken() != TDO)
11367 raise_error_unexpected_syntax(TDO);
11368 n1->nfor.body = list(0);
11372 n1 = stzalloc(sizeof(struct ncase));
11374 if (readtoken() != TWORD)
11375 raise_error_unexpected_syntax(TWORD);
11376 n1->ncase.expr = n2 = stzalloc(sizeof(struct narg));
11378 /*n2->narg.next = NULL; - stzalloc did it */
11379 n2->narg.text = wordtext;
11380 n2->narg.backquote = backquotelist;
11381 checkkwd = CHKNL | CHKKWD | CHKALIAS;
11382 if (readtoken() != TIN)
11383 raise_error_unexpected_syntax(TIN);
11384 cpp = &n1->ncase.cases;
11386 checkkwd = CHKNL | CHKKWD;
11388 while (t != TESAC) {
11389 if (lasttoken == TLP)
11391 *cpp = cp = stzalloc(sizeof(struct nclist));
11393 app = &cp->nclist.pattern;
11395 *app = ap = stzalloc(sizeof(struct narg));
11397 /*ap->narg.next = NULL; - stzalloc did it */
11398 ap->narg.text = wordtext;
11399 ap->narg.backquote = backquotelist;
11400 if (readtoken() != TPIPE)
11402 app = &ap->narg.next;
11405 //ap->narg.next = NULL;
11406 if (lasttoken != TRP)
11407 raise_error_unexpected_syntax(TRP);
11408 cp->nclist.body = list(2);
11410 cpp = &cp->nclist.next;
11412 checkkwd = CHKNL | CHKKWD;
11416 raise_error_unexpected_syntax(TENDCASE);
11423 n1 = stzalloc(sizeof(struct nredir));
11424 n1->type = NSUBSHELL;
11425 n1->nredir.n = list(0);
11426 /*n1->nredir.redirect = NULL; - stzalloc did it */
11433 IF_BASH_FUNCTION(case TFUNCTION:)
11437 return simplecmd();
11440 if (readtoken() != t)
11441 raise_error_unexpected_syntax(t);
11444 /* Now check for redirection which may follow command */
11445 checkkwd = CHKKWD | CHKALIAS;
11447 while (readtoken() == TREDIR) {
11448 *rpp = n2 = redirnode;
11449 rpp = &n2->nfile.next;
11455 if (n1->type != NSUBSHELL) {
11456 n2 = stzalloc(sizeof(struct nredir));
11461 n1->nredir.redirect = redir;
11466 #if BASH_DOLLAR_SQUOTE
11468 decode_dollar_squote(void)
11470 static const char C_escapes[] ALIGN1 = "nrbtfav""x\\01234567";
11476 p = strchr(C_escapes, c);
11481 if ((unsigned char)(c - '0') <= 7) { /* \ooo */
11485 } while ((unsigned char)(c - '0') <= 7 && --cnt);
11487 } else if (c == 'x') { /* \xHH */
11491 } while (isxdigit(c) && --cnt);
11493 if (cnt == 3) { /* \x but next char is "bad" */
11497 } else { /* simple seq like \\ or \t */
11502 c = bb_process_escape_sequence((void*)&p);
11503 } else { /* unrecognized "\z": print both chars unless ' or " */
11504 if (c != '\'' && c != '"') {
11506 c |= 0x100; /* "please encode \, then me" */
11514 * If eofmark is NULL, read a word or a redirection symbol. If eofmark
11515 * is not NULL, read a here document. In the latter case, eofmark is the
11516 * word which marks the end of the document and striptabs is true if
11517 * leading tabs should be stripped from the document. The argument c
11518 * is the first character of the input token or document.
11520 * Because C does not have internal subroutines, I have simulated them
11521 * using goto's to implement the subroutine linkage. The following macros
11522 * will run code that appears at the end of readtoken1.
11524 #define CHECKEND() {goto checkend; checkend_return:;}
11525 #define PARSEREDIR() {goto parseredir; parseredir_return:;}
11526 #define PARSESUB() {goto parsesub; parsesub_return:;}
11527 #define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;}
11528 #define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;}
11529 #define PARSEARITH() {goto parsearith; parsearith_return:;}
11531 readtoken1(int c, int syntax, char *eofmark, int striptabs)
11533 /* NB: syntax parameter fits into smallint */
11534 /* c parameter is an unsigned char or PEOF or PEOA */
11537 char line[EOFMARKLEN + 1];
11538 struct nodelist *bqlist;
11542 IF_FEATURE_SH_MATH(smallint prevsyntax;) /* syntax before arithmetic */
11543 #if ENABLE_ASH_EXPAND_PRMT
11544 smallint pssyntax; /* we are expanding a prompt string */
11546 int varnest; /* levels of variables expansion */
11547 IF_FEATURE_SH_MATH(int arinest;) /* levels of arithmetic expansion */
11548 IF_FEATURE_SH_MATH(int parenlevel;) /* levels of parens in arithmetic */
11549 int dqvarnest; /* levels of variables expansion within double quotes */
11551 IF_BASH_DOLLAR_SQUOTE(smallint bash_dollar_squote = 0;)
11553 startlinno = g_parsefile->linno;
11556 IF_FEATURE_SH_MATH(prevsyntax = 0;)
11557 #if ENABLE_ASH_EXPAND_PRMT
11558 pssyntax = (syntax == PSSYNTAX);
11562 dblquote = (syntax == DQSYNTAX);
11564 IF_FEATURE_SH_MATH(arinest = 0;)
11565 IF_FEATURE_SH_MATH(parenlevel = 0;)
11568 STARTSTACKSTR(out);
11570 /* For each line, until end of word */
11571 CHECKEND(); /* set c to PEOF if at end of here document */
11572 for (;;) { /* until end of line or end of word */
11573 CHECKSTRSPACE(4, out); /* permit 4 calls to USTPUTC */
11574 switch (SIT(c, syntax)) {
11575 case CNL: /* '\n' */
11576 if (syntax == BASESYNTAX)
11577 goto endword; /* exit outer loop */
11581 goto loop; /* continue outer loop */
11586 #if BASH_DOLLAR_SQUOTE
11587 if (c == '\\' && bash_dollar_squote) {
11588 c = decode_dollar_squote();
11590 /* skip $'\000', $'\x00' (like bash) */
11594 /* Unknown escape. Encode as '\z' */
11595 c = (unsigned char)c;
11596 if (eofmark == NULL || dblquote)
11597 USTPUTC(CTLESC, out);
11598 USTPUTC('\\', out);
11602 if (eofmark == NULL || dblquote)
11603 USTPUTC(CTLESC, out);
11606 case CBACK: /* backslash */
11607 c = pgetc_without_PEOA();
11609 USTPUTC(CTLESC, out);
11610 USTPUTC('\\', out);
11612 } else if (c == '\n') {
11615 #if ENABLE_ASH_EXPAND_PRMT
11616 if (c == '$' && pssyntax) {
11617 USTPUTC(CTLESC, out);
11618 USTPUTC('\\', out);
11621 /* Backslash is retained if we are in "str" and next char isn't special */
11626 && (c != '"' || eofmark != NULL)
11628 USTPUTC('\\', out);
11630 USTPUTC(CTLESC, out);
11638 if (eofmark == NULL) {
11639 USTPUTC(CTLQUOTEMARK, out);
11647 IF_BASH_DOLLAR_SQUOTE(bash_dollar_squote = 0;)
11648 if (eofmark != NULL && varnest == 0) {
11651 if (dqvarnest == 0) {
11652 syntax = BASESYNTAX;
11659 case CVAR: /* '$' */
11660 PARSESUB(); /* parse substitution */
11662 case CENDVAR: /* '}' */
11665 if (dqvarnest > 0) {
11672 #if ENABLE_FEATURE_SH_MATH
11673 case CLP: /* '(' in arithmetic */
11677 case CRP: /* ')' in arithmetic */
11678 if (parenlevel > 0) {
11681 if (pgetc_eatbnl() == ')') {
11683 if (--arinest == 0) {
11684 syntax = prevsyntax;
11688 * unbalanced parens
11689 * (don't 2nd guess - no error)
11697 case CBQUOTE: /* '`' */
11701 goto endword; /* exit outer loop */
11705 if (varnest == 0) {
11706 #if BASH_REDIR_OUTPUT
11708 //Can't call pgetc_eatbnl() here, this requires three-deep pungetc()
11709 if (pgetc() == '>')
11710 c = 0x100 + '>'; /* flag &> */
11714 goto endword; /* exit outer loop */
11716 IF_ASH_ALIAS(if (c != PEOA))
11723 #if ENABLE_FEATURE_SH_MATH
11724 if (syntax == ARISYNTAX)
11725 raise_error_syntax("missing '))'");
11727 if (syntax != BASESYNTAX && eofmark == NULL)
11728 raise_error_syntax("unterminated quoted string");
11729 if (varnest != 0) {
11730 startlinno = g_parsefile->linno;
11732 raise_error_syntax("missing '}'");
11734 USTPUTC('\0', out);
11735 len = out - (char *)stackblock();
11736 out = stackblock();
11737 if (eofmark == NULL) {
11738 if ((c == '>' || c == '<' IF_BASH_REDIR_OUTPUT( || c == 0x100 + '>'))
11741 if (isdigit_str9(out)) {
11742 PARSEREDIR(); /* passed as params: out, c */
11743 lasttoken = TREDIR;
11746 /* else: non-number X seen, interpret it
11747 * as "NNNX>file" = "NNNX >file" */
11751 quoteflag = quotef;
11752 backquotelist = bqlist;
11753 grabstackblock(len);
11757 /* end of readtoken routine */
11760 * Check to see whether we are at the end of the here document. When this
11761 * is called, c is set to the first character of the next input line. If
11762 * we are at the end of the here document, this routine sets the c to PEOF.
11766 #if ENABLE_ASH_ALIAS
11768 c = pgetc_without_PEOA();
11771 while (c == '\t') {
11772 c = pgetc_without_PEOA();
11775 if (c == *eofmark) {
11776 if (pfgets(line, sizeof(line)) != NULL) {
11781 for (q = eofmark + 1;; p++, q++) {
11785 if (!*q || cc != *q)
11792 pushstring(line, NULL);
11797 goto checkend_return;
11801 * Parse a redirection operator. The variable "out" points to a string
11802 * specifying the fd to be redirected. The variable "c" contains the
11803 * first character of the redirection operator.
11806 /* out is already checked to be a valid number or "" */
11807 int fd = (*out == '\0' ? -1 : atoi(out));
11810 np = stzalloc(sizeof(struct nfile));
11815 np->type = NAPPEND;
11817 np->type = NCLOBBER;
11820 /* it also can be NTO2 (>&file), but we can't figure it out yet */
11826 #if BASH_REDIR_OUTPUT
11827 else if (c == 0x100 + '>') { /* this flags &> redirection */
11829 pgetc(); /* this is '>', no need to check */
11833 else { /* c == '<' */
11834 /*np->nfile.fd = 0; - stzalloc did it */
11838 if (sizeof(struct nfile) != sizeof(struct nhere)) {
11839 np = stzalloc(sizeof(struct nhere));
11840 /*np->nfile.fd = 0; - stzalloc did it */
11843 heredoc = stzalloc(sizeof(struct heredoc));
11844 heredoc->here = np;
11847 heredoc->striptabs = 1;
11849 /*heredoc->striptabs = 0; - stzalloc did it */
11855 np->type = NFROMFD;
11859 np->type = NFROMTO;
11871 goto parseredir_return;
11875 * Parse a substitution. At this point, we have read the dollar sign
11876 * and nothing else.
11879 /* is_special(c) evaluates to 1 for c in "!#$*-0123456789?@"; 0 otherwise
11880 * (assuming ascii char codes, as the original implementation did) */
11881 #define is_special(c) \
11882 (((unsigned)(c) - 33 < 32) \
11883 && ((0xc1ff920dU >> ((unsigned)(c) - 33)) & 1))
11885 unsigned char subtype;
11888 c = pgetc_eatbnl();
11889 if (c > 255 /* PEOA or PEOF */
11890 || (c != '(' && c != '{' && !is_name(c) && !is_special(c))
11892 #if BASH_DOLLAR_SQUOTE
11893 if (syntax != DQSYNTAX && c == '\'')
11894 bash_dollar_squote = 1;
11899 } else if (c == '(') {
11900 /* $(command) or $((arith)) */
11901 if (pgetc_eatbnl() == '(') {
11902 #if ENABLE_FEATURE_SH_MATH
11905 raise_error_syntax("you disabled math support for $((arith)) syntax");
11912 /* $VAR, $<specialchar>, ${...}, or PEOA/PEOF */
11913 USTPUTC(CTLVAR, out);
11914 typeloc = out - (char *)stackblock();
11916 subtype = VSNORMAL;
11918 c = pgetc_eatbnl();
11923 /* $[{[#]]NAME[}] */
11926 c = pgetc_eatbnl();
11927 } while (is_in_name(c));
11928 } else if (isdigit(c)) {
11929 /* $[{[#]]NUM[}] */
11932 c = pgetc_eatbnl();
11933 } while (isdigit(c));
11934 } else if (is_special(c)) {
11935 /* $[{[#]]<specialchar>[}] */
11938 c = pgetc_eatbnl();
11939 if (!subtype && cc == '#') {
11940 subtype = VSLENGTH;
11941 if (c == '_' || isalnum(c))
11944 c = pgetc_eatbnl();
11945 if (cc == '}' || c != '}') {
11956 if (c != '}' && subtype == VSLENGTH) {
11957 /* ${#VAR didn't end with } */
11961 if (subtype == 0) {
11962 static const char types[] ALIGN1 = "}-+?=";
11963 /* ${VAR...} but not $VAR or ${#VAR} */
11964 /* c == first char after VAR */
11967 c = pgetc_eatbnl();
11969 /* This check is only needed to not misinterpret
11970 * ${VAR:-WORD}, ${VAR:+WORD}, ${VAR:=WORD}, ${VAR:?WORD}
11973 if (!strchr(types, c)) {
11974 subtype = VSSUBSTR;
11976 break; /* "goto badsub" is bigger (!) */
11982 const char *p = strchr(types, c);
11985 subtype |= p - types + VSNORMAL;
11991 subtype = (c == '#' ? VSTRIMLEFT : VSTRIMRIGHT);
11992 c = pgetc_eatbnl();
11998 #if BASH_PATTERN_SUBST
12000 /* ${v/[/]pattern/repl} */
12001 //TODO: encode pattern and repl separately.
12002 // Currently ${v/$var_with_slash/repl} is horribly broken
12003 subtype = VSREPLACE;
12004 c = pgetc_eatbnl();
12007 subtype++; /* VSREPLACEALL */
12015 ((unsigned char *)stackblock())[typeloc] = subtype;
12016 if (subtype != VSNORMAL) {
12023 goto parsesub_return;
12027 * Called to parse command substitutions. Newstyle is set if the command
12028 * is enclosed inside $(...); nlpp is a pointer to the head of the linked
12029 * list of commands (passed by reference), and savelen is the number of
12030 * characters on the top of the stack which must be preserved.
12033 struct nodelist **nlpp;
12037 smallint saveprompt = 0;
12040 savelen = out - (char *)stackblock();
12043 * FIXME: this can allocate very large block on stack and SEGV.
12045 * echo "..<100kbytes>..`true` $(true) `true` ..."
12046 * allocates 100kb for every command subst. With about
12047 * a hundred command substitutions stack overflows.
12048 * With larger prepended string, SEGV happens sooner.
12050 str = alloca(savelen);
12051 memcpy(str, stackblock(), savelen);
12055 /* We must read until the closing backquote, giving special
12056 * treatment to some slashes, and then push the string and
12057 * reread it as input, interpreting it normally.
12063 STARTSTACKSTR(pout);
12067 setprompt_if(needprompt, 2);
12078 * If eating a newline, avoid putting
12079 * the newline into the new character
12080 * stream (via the STPUTC after the
12085 if (pc != '\\' && pc != '`' && pc != '$'
12086 && (!dblquote || pc != '"')
12088 STPUTC('\\', pout);
12090 if (pc <= 255 /* not PEOA or PEOF */) {
12096 IF_ASH_ALIAS(case PEOA:)
12097 startlinno = g_parsefile->linno;
12098 raise_error_syntax("EOF in backquote substitution");
12110 STPUTC('\0', pout);
12111 psavelen = pout - (char *)stackblock();
12112 if (psavelen > 0) {
12113 pstr = grabstackstr(pout);
12114 setinputstring(pstr);
12119 nlpp = &(*nlpp)->next;
12120 *nlpp = stzalloc(sizeof(**nlpp));
12121 /* (*nlpp)->next = NULL; - stzalloc did it */
12124 saveprompt = doprompt;
12131 doprompt = saveprompt;
12132 else if (readtoken() != TRP)
12133 raise_error_unexpected_syntax(TRP);
12138 * Start reading from old file again, ignoring any pushed back
12139 * tokens left from the backquote parsing
12144 while (stackblocksize() <= savelen)
12146 STARTSTACKSTR(out);
12148 memcpy(out, str, savelen);
12149 STADJUST(savelen, out);
12151 USTPUTC(CTLBACKQ, out);
12153 goto parsebackq_oldreturn;
12154 goto parsebackq_newreturn;
12157 #if ENABLE_FEATURE_SH_MATH
12159 * Parse an arithmetic expansion (indicate start of one and set state)
12162 if (++arinest == 1) {
12163 prevsyntax = syntax;
12164 syntax = ARISYNTAX;
12166 USTPUTC(CTLARI, out);
12167 goto parsearith_return;
12170 } /* end of readtoken */
12173 * Read the next input token.
12174 * If the token is a word, we set backquotelist to the list of cmds in
12175 * backquotes. We set quoteflag to true if any part of the word was
12177 * If the token is TREDIR, then we set redirnode to a structure containing
12179 * In all cases, the variable startlinno is set to the number of the line
12180 * on which the token starts.
12182 * [Change comment: here documents and internal procedures]
12183 * [Readtoken shouldn't have any arguments. Perhaps we should make the
12184 * word parsing code into a separate routine. In this case, readtoken
12185 * doesn't need to have any internal procedures, but parseword does.
12186 * We could also make parseoperator in essence the main routine, and
12187 * have parseword (readtoken1?) handle both words and redirection.]
12189 #define NEW_xxreadtoken
12190 #ifdef NEW_xxreadtoken
12191 /* singles must be first! */
12192 static const char xxreadtoken_chars[7] ALIGN1 = {
12193 '\n', '(', ')', /* singles */
12194 '&', '|', ';', /* doubles */
12198 #define xxreadtoken_singles 3
12199 #define xxreadtoken_doubles 3
12201 static const char xxreadtoken_tokens[] ALIGN1 = {
12202 TNL, TLP, TRP, /* only single occurrence allowed */
12203 TBACKGND, TPIPE, TSEMI, /* if single occurrence */
12204 TEOF, /* corresponds to trailing nul */
12205 TAND, TOR, TENDCASE /* if double occurrence */
12217 setprompt_if(needprompt, 2);
12218 startlinno = g_parsefile->linno;
12219 for (;;) { /* until token or start of word found */
12221 if (c == ' ' || c == '\t' IF_ASH_ALIAS( || c == PEOA))
12225 while ((c = pgetc()) != '\n' && c != PEOF)
12228 } else if (c == '\\') {
12229 if (pgetc() != '\n') {
12231 break; /* return readtoken1(...) */
12237 p = xxreadtoken_chars + sizeof(xxreadtoken_chars) - 1;
12243 p = strchr(xxreadtoken_chars, c);
12245 break; /* return readtoken1(...) */
12247 if ((int)(p - xxreadtoken_chars) >= xxreadtoken_singles) {
12249 if (cc == c) { /* double occurrence? */
12250 p += xxreadtoken_doubles + 1;
12253 #if BASH_REDIR_OUTPUT
12254 if (c == '&' && cc == '>') /* &> */
12255 break; /* return readtoken1(...) */
12260 lasttoken = xxreadtoken_tokens[p - xxreadtoken_chars];
12265 return readtoken1(c, BASESYNTAX, (char *) NULL, 0);
12267 #else /* old xxreadtoken */
12268 #define RETURN(token) return lasttoken = token
12278 setprompt_if(needprompt, 2);
12279 startlinno = g_parsefile->linno;
12280 for (;;) { /* until token or start of word found */
12283 case ' ': case '\t':
12284 IF_ASH_ALIAS(case PEOA:)
12287 while ((c = pgetc()) != '\n' && c != PEOF)
12292 if (pgetc() == '\n') {
12304 if (pgetc() == '&')
12309 if (pgetc() == '|')
12314 if (pgetc() == ';')
12327 return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
12330 #endif /* old xxreadtoken */
12336 int kwd = checkkwd;
12338 smallint alreadyseen = tokpushback;
12341 #if ENABLE_ASH_ALIAS
12357 if (t != TWORD || quoteflag) {
12362 * check for keywords
12364 if (kwd & CHKKWD) {
12365 const char *const *pp;
12367 pp = findkwd(wordtext);
12369 lasttoken = t = pp - tokname_array;
12370 TRACE(("keyword '%s' recognized\n", tokname_array[t]));
12375 if (checkkwd & CHKALIAS) {
12376 #if ENABLE_ASH_ALIAS
12378 ap = lookupalias(wordtext, 1);
12381 pushstring(ap->val, ap);
12391 TRACE(("token '%s' %s\n", tokname_array[t], t == TWORD ? wordtext : ""));
12393 TRACE(("reread token '%s' %s\n", tokname_array[t], t == TWORD ? wordtext : ""));
12409 * Read and parse a command. Returns NODE_EOF on end of file.
12410 * (NULL is a valid parse tree indicating a blank line.)
12412 static union node *
12413 parsecmd(int interact)
12418 doprompt = interact;
12419 setprompt_if(doprompt, doprompt);
12425 * Input any here documents.
12430 struct heredoc *here;
12433 here = heredoclist;
12434 heredoclist = NULL;
12437 setprompt_if(needprompt, 2);
12438 readtoken1(pgetc(), here->here->type == NHERE ? SQSYNTAX : DQSYNTAX,
12439 here->eofmark, here->striptabs);
12440 n = stzalloc(sizeof(struct narg));
12441 n->narg.type = NARG;
12442 /*n->narg.next = NULL; - stzalloc did it */
12443 n->narg.text = wordtext;
12444 n->narg.backquote = backquotelist;
12445 here->here->nhere.doc = n;
12452 * called by editline -- any expansions to the prompt should be added here.
12454 #if ENABLE_ASH_EXPAND_PRMT
12455 static const char *
12456 expandstr(const char *ps)
12461 /* XXX Fix (char *) cast. It _is_ a bug. ps is variable's value,
12462 * and token processing _can_ alter it (delete NULs etc). */
12463 setinputstring((char *)ps);
12465 saveprompt = doprompt;
12467 readtoken1(pgetc(), PSSYNTAX, nullstr, 0);
12468 doprompt = saveprompt;
12472 n.narg.type = NARG;
12473 n.narg.next = NULL;
12474 n.narg.text = wordtext;
12475 n.narg.backquote = backquotelist;
12477 expandarg(&n, NULL, EXP_QUOTED);
12478 return stackblock();
12483 * Execute a command or commands contained in a string.
12486 evalstring(char *s, int flags)
12488 struct jmploc *volatile savehandler;
12489 struct jmploc jmploc;
12493 struct stackmark smark;
12498 setstackmark(&smark);
12501 /* On exception inside execution loop, we must popfile().
12502 * Try interactively:
12504 * command eval "a=b" # throws "is read only" error
12505 * "command BLTIN" is not supposed to abort (even in non-interactive use).
12506 * But if we skip popfile(), we hit EOF in eval's string, and exit.
12508 savehandler = exception_handler;
12509 ex = setjmp(jmploc.loc);
12512 exception_handler = &jmploc;
12514 while ((n = parsecmd(0)) != NODE_EOF) {
12517 i = evaltree(n, flags);
12520 popstackmark(&smark);
12525 popstackmark(&smark);
12529 exception_handler = savehandler;
12531 longjmp(exception_handler->loc, ex);
12537 * The eval command.
12539 static int FAST_FUNC
12540 evalcmd(int argc UNUSED_PARAM, char **argv, int flags)
12549 STARTSTACKSTR(concat);
12551 concat = stack_putstr(p, concat);
12555 STPUTC(' ', concat);
12557 STPUTC('\0', concat);
12558 p = grabstackstr(concat);
12560 return evalstring(p, flags & EV_TESTED);
12566 * Read and execute commands.
12567 * "Top" is nonzero for the top level command loop;
12568 * it turns on prompting if the shell is interactive.
12574 struct stackmark smark;
12579 TRACE(("cmdloop(%d) called\n", top));
12583 setstackmark(&smark);
12586 showjobs(SHOW_CHANGED|SHOW_STDERR);
12589 if (iflag && top) {
12593 n = parsecmd(inter);
12595 if (DEBUG > 2 && debug && (n != NODE_EOF))
12598 if (n == NODE_EOF) {
12599 if (!top || numeof >= 50)
12601 if (!stoppedjobs()) {
12604 out2str("\nUse \"exit\" to leave shell.\n");
12607 } else if (nflag == 0) {
12610 /* job_warning can only be 2,1,0. Here 2->1, 1/0->0 */
12613 i = evaltree(n, 0);
12617 popstackmark(&smark);
12621 evalskip &= ~SKIPFUNC;
12629 * Take commands from a file. To be compatible we should do a path
12630 * search for the file, which is necessary to find sub-commands.
12633 find_dot_file(char *name)
12636 const char *path = pathval();
12639 /* don't try this for absolute or relative paths */
12640 if (strchr(name, '/'))
12643 while ((fullname = path_advance(&path, name)) != NULL) {
12644 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
12646 * Don't bother freeing here, since it will
12647 * be freed by the caller.
12651 if (fullname != name)
12652 stunalloc(fullname);
12655 /* not found in the PATH */
12656 ash_msg_and_raise_error("%s: not found", name);
12660 static int FAST_FUNC
12661 dotcmd(int argc_ UNUSED_PARAM, char **argv_ UNUSED_PARAM)
12663 /* "false; . empty_file; echo $?" should print 0, not 1: */
12667 char *args_need_save;
12668 struct strlist *sp;
12669 volatile struct shparam saveparam;
12671 for (sp = cmdenviron; sp; sp = sp->next)
12672 setvareq(ckstrdup(sp->text), VSTRFIXED | VTEXTFIXED);
12674 nextopt(nullstr); /* handle possible "--" */
12678 /* bash says: "bash: .: filename argument required" */
12679 return 2; /* bash compat */
12682 /* This aborts if file isn't found, which is POSIXly correct.
12683 * bash returns exitcode 1 instead.
12685 fullname = find_dot_file(argv[0]);
12687 args_need_save = argv[0];
12688 if (args_need_save) { /* ". FILE ARGS", and ARGS are not empty */
12690 saveparam = shellparam;
12691 shellparam.malloced = 0;
12695 shellparam.nparam = argc;
12696 shellparam.p = argv;
12699 /* This aborts if file can't be opened, which is POSIXly correct.
12700 * bash returns exitcode 1 instead.
12702 setinputfile(fullname, INPUT_PUSH_FILE);
12703 commandname = fullname;
12704 status = cmdloop(0);
12707 if (args_need_save) {
12708 freeparam(&shellparam);
12709 shellparam = saveparam;
12715 static int FAST_FUNC
12716 exitcmd(int argc UNUSED_PARAM, char **argv)
12721 exitstatus = number(argv[1]);
12722 raise_exception(EXEXIT);
12727 * Read a file containing shell functions.
12730 readcmdfile(char *name)
12732 setinputfile(name, INPUT_PUSH_FILE);
12738 /* ============ find_command inplementation */
12741 * Resolve a command name. If you change this routine, you may have to
12742 * change the shellexec routine as well.
12745 find_command(char *name, struct cmdentry *entry, int act, const char *path)
12747 struct tblentry *cmdp;
12754 struct builtincmd *bcmd;
12756 /* If name contains a slash, don't use PATH or hash table */
12757 if (strchr(name, '/') != NULL) {
12758 entry->u.index = -1;
12759 if (act & DO_ABS) {
12760 while (stat(name, &statb) < 0) {
12762 if (errno == EINTR)
12765 entry->cmdtype = CMDUNKNOWN;
12769 entry->cmdtype = CMDNORMAL;
12773 /* #if ENABLE_FEATURE_SH_STANDALONE... moved after builtin check */
12775 updatetbl = (path == pathval());
12778 if (strstr(path, "%builtin") != NULL)
12779 act |= DO_ALTBLTIN;
12782 /* If name is in the table, check answer will be ok */
12783 cmdp = cmdlookup(name, 0);
12784 if (cmdp != NULL) {
12787 switch (cmdp->cmdtype) {
12805 } else if (cmdp->rehash == 0)
12806 /* if not invalidated by cd, we're done */
12810 /* If %builtin not in path, check for builtin next */
12811 bcmd = find_builtin(name);
12813 if (IS_BUILTIN_REGULAR(bcmd))
12814 goto builtin_success;
12815 if (act & DO_ALTPATH) {
12816 if (!(act & DO_ALTBLTIN))
12817 goto builtin_success;
12818 } else if (builtinloc <= 0) {
12819 goto builtin_success;
12823 #if ENABLE_FEATURE_SH_STANDALONE
12825 int applet_no = find_applet_by_name(name);
12826 if (applet_no >= 0) {
12827 entry->cmdtype = CMDNORMAL;
12828 entry->u.index = -2 - applet_no;
12834 /* We have to search path. */
12835 prev = -1; /* where to start */
12836 if (cmdp && cmdp->rehash) { /* doing a rehash */
12837 if (cmdp->cmdtype == CMDBUILTIN)
12840 prev = cmdp->param.index;
12846 while ((fullname = path_advance(&path, name)) != NULL) {
12847 stunalloc(fullname);
12848 /* NB: code below will still use fullname
12849 * despite it being "unallocated" */
12852 if (prefix(pathopt, "builtin")) {
12854 goto builtin_success;
12857 if ((act & DO_NOFUNC)
12858 || !prefix(pathopt, "func")
12859 ) { /* ignore unimplemented options */
12863 /* if rehash, don't redo absolute path names */
12864 if (fullname[0] == '/' && idx <= prev) {
12867 TRACE(("searchexec \"%s\": no change\n", name));
12870 while (stat(fullname, &statb) < 0) {
12872 if (errno == EINTR)
12875 if (errno != ENOENT && errno != ENOTDIR)
12879 e = EACCES; /* if we fail, this will be the error */
12880 if (!S_ISREG(statb.st_mode))
12882 if (pathopt) { /* this is a %func directory */
12883 stalloc(strlen(fullname) + 1);
12884 /* NB: stalloc will return space pointed by fullname
12885 * (because we don't have any intervening allocations
12886 * between stunalloc above and this stalloc) */
12887 readcmdfile(fullname);
12888 cmdp = cmdlookup(name, 0);
12889 if (cmdp == NULL || cmdp->cmdtype != CMDFUNCTION)
12890 ash_msg_and_raise_error("%s not defined in %s", name, fullname);
12891 stunalloc(fullname);
12894 TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
12896 entry->cmdtype = CMDNORMAL;
12897 entry->u.index = idx;
12901 cmdp = cmdlookup(name, 1);
12902 cmdp->cmdtype = CMDNORMAL;
12903 cmdp->param.index = idx;
12908 /* We failed. If there was an entry for this command, delete it */
12909 if (cmdp && updatetbl)
12910 delete_cmd_entry();
12912 ash_msg("%s: %s", name, errmsg(e, "not found"));
12913 entry->cmdtype = CMDUNKNOWN;
12918 entry->cmdtype = CMDBUILTIN;
12919 entry->u.cmd = bcmd;
12923 cmdp = cmdlookup(name, 1);
12924 cmdp->cmdtype = CMDBUILTIN;
12925 cmdp->param.cmd = bcmd;
12929 entry->cmdtype = cmdp->cmdtype;
12930 entry->u = cmdp->param;
12935 * The trap builtin.
12937 static int FAST_FUNC
12938 trapcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12942 int signo, exitcode;
12947 for (signo = 0; signo < NSIG; signo++) {
12948 char *tr = trap_ptr[signo];
12950 /* note: bash adds "SIG", but only if invoked
12951 * as "bash". If called as "sh", or if set -o posix,
12952 * then it prints short signal names.
12953 * We are printing short names: */
12954 out1fmt("trap -- %s %s\n",
12956 get_signame(signo));
12957 /* trap_ptr != trap only if we are in special-cased `trap` code.
12958 * In this case, we will exit very soon, no need to free(). */
12959 /* if (trap_ptr != trap && tp[0]) */
12964 if (trap_ptr != trap) {
12977 signo = get_signum(*ap);
12979 /* Mimic bash message exactly */
12980 ash_msg("%s: invalid signal specification", *ap);
12986 if (LONE_DASH(action))
12989 if (action[0]) /* not NULL and not "" and not "-" */
12990 may_have_traps = 1;
12991 action = ckstrdup(action);
12995 trap[signo] = action;
13006 /* ============ Builtins */
13008 #if ENABLE_ASH_HELP
13009 static int FAST_FUNC
13010 helpcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
13016 "Built-in commands:\n"
13017 "------------------\n");
13018 for (col = 0, i = 0; i < ARRAY_SIZE(builtintab); i++) {
13019 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '),
13020 builtintab[i].name + 1);
13026 # if ENABLE_FEATURE_SH_STANDALONE
13028 const char *a = applet_names;
13030 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '), a);
13035 while (*a++ != '\0')
13040 newline_and_flush(stdout);
13041 return EXIT_SUCCESS;
13046 static int FAST_FUNC
13047 historycmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
13049 show_history(line_input_state);
13050 return EXIT_SUCCESS;
13055 * The export and readonly commands.
13057 static int FAST_FUNC
13058 exportcmd(int argc UNUSED_PARAM, char **argv)
13068 /* "readonly" in bash accepts, but ignores -n.
13069 * We do the same: it saves a conditional in nextopt's param.
13072 while ((opt = nextopt("np")) != '\0') {
13074 flag_off = VEXPORT;
13077 if (argv[0][0] == 'r') {
13079 flag_off = 0; /* readonly ignores -n */
13081 flag_off = ~flag_off;
13083 /*if (opt_p_not_specified) - bash doesnt check this. Try "export -p NAME" */
13089 p = strchr(name, '=');
13093 vp = *findvar(hashvar(name), name);
13095 vp->flags = ((vp->flags | flag) & flag_off);
13099 setvar(name, p, (flag & flag_off));
13100 } while ((name = *++aptr) != NULL);
13105 /* No arguments. Show the list of exported or readonly vars.
13108 showvars(argv[0], flag, 0);
13113 * Delete a function if it exists.
13116 unsetfunc(const char *name)
13118 struct tblentry *cmdp;
13120 cmdp = cmdlookup(name, 0);
13121 if (cmdp != NULL && cmdp->cmdtype == CMDFUNCTION)
13122 delete_cmd_entry();
13126 * The unset builtin command. We unset the function before we unset the
13127 * variable to allow a function to be unset when there is a readonly variable
13128 * with the same name.
13130 static int FAST_FUNC
13131 unsetcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
13138 while ((i = nextopt("vf")) != 0) {
13142 for (ap = argptr; *ap; ap++) {
13155 static const unsigned char timescmd_str[] ALIGN1 = {
13156 ' ', offsetof(struct tms, tms_utime),
13157 '\n', offsetof(struct tms, tms_stime),
13158 ' ', offsetof(struct tms, tms_cutime),
13159 '\n', offsetof(struct tms, tms_cstime),
13162 static int FAST_FUNC
13163 timescmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
13165 unsigned long clk_tck, s, t;
13166 const unsigned char *p;
13169 clk_tck = bb_clk_tck();
13174 t = *(clock_t *)(((char *) &buf) + p[1]);
13177 out1fmt("%lum%lu.%03lus%c",
13179 (t * 1000) / clk_tck,
13187 #if ENABLE_FEATURE_SH_MATH
13189 * The let builtin. Partially stolen from GNU Bash, the Bourne Again SHell.
13190 * Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
13192 * Copyright (C) 2003 Vladimir Oleynik <dzo@simtreas.ru>
13194 static int FAST_FUNC
13195 letcmd(int argc UNUSED_PARAM, char **argv)
13201 ash_msg_and_raise_error("expression expected");
13203 i = ash_arith(*argv);
13211 * The read builtin. Options:
13212 * -r Do not interpret '\' specially
13213 * -s Turn off echo (tty only)
13214 * -n NCHARS Read NCHARS max
13215 * -p PROMPT Display PROMPT on stderr (if input is from tty)
13216 * -t SECONDS Timeout after SECONDS (tty or pipe only)
13217 * -u FD Read from given FD instead of fd 0
13218 * This uses unbuffered input, which may be avoidable in some cases.
13219 * TODO: bash also has:
13220 * -a ARRAY Read into array[0],[1],etc
13221 * -d DELIM End on DELIM char, not newline
13222 * -e Use line editing (tty only)
13224 static int FAST_FUNC
13225 readcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
13227 char *opt_n = NULL;
13228 char *opt_p = NULL;
13229 char *opt_t = NULL;
13230 char *opt_u = NULL;
13231 int read_flags = 0;
13235 while ((i = nextopt("p:u:rt:n:s")) != '\0') {
13244 read_flags |= BUILTIN_READ_SILENT;
13250 read_flags |= BUILTIN_READ_RAW;
13260 /* "read -s" needs to save/restore termios, can't allow ^C
13261 * to jump out of it.
13264 r = shell_builtin_read(setvar0,
13266 bltinlookup("IFS"), /* can be NULL */
13275 if ((uintptr_t)r > 1)
13276 ash_msg_and_raise_error(r);
13278 return (uintptr_t)r;
13281 static int FAST_FUNC
13282 umaskcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
13284 static const char permuser[3] ALIGN1 = "ogu";
13287 int symbolic_mode = 0;
13289 while (nextopt("S") != '\0') {
13298 if (*argptr == NULL) {
13299 if (symbolic_mode) {
13300 char buf[sizeof(",u=rwx,g=rwx,o=rwx")];
13307 *p++ = permuser[i];
13309 /* mask is 0..0uuugggooo. i=2 selects uuu bits */
13310 if (!(mask & 0400)) *p++ = 'r';
13311 if (!(mask & 0200)) *p++ = 'w';
13312 if (!(mask & 0100)) *p++ = 'x';
13320 out1fmt("%04o\n", mask);
13323 char *modestr = *argptr;
13324 /* numeric umasks are taken as-is */
13325 /* symbolic umasks are inverted: "umask a=rx" calls umask(222) */
13326 if (!isdigit(modestr[0]))
13328 mask = bb_parse_mode(modestr, mask);
13329 if ((unsigned)mask > 0777) {
13330 ash_msg_and_raise_error("illegal mode: %s", modestr);
13332 if (!isdigit(modestr[0]))
13339 static int FAST_FUNC
13340 ulimitcmd(int argc UNUSED_PARAM, char **argv)
13342 return shell_builtin_ulimit(argv);
13345 /* ============ main() and helpers */
13348 * Called to exit the shell.
13357 #if ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
13358 save_history(line_input_state);
13360 status = exitstatus;
13361 TRACE(("pid %d, exitshell(%d)\n", getpid(), status));
13362 if (setjmp(loc.loc)) {
13363 if (exception_type == EXEXIT)
13364 status = exitstatus;
13367 exception_handler = &loc;
13373 /*free(p); - we'll exit soon */
13376 /* dash wraps setjobctl(0) in "if (setjmp(loc.loc) == 0) {...}".
13377 * our setjobctl(0) does not panic if tcsetpgrp fails inside it.
13380 flush_stdout_stderr();
13388 /* we will never free this */
13389 basepf.next_to_pgetc = basepf.buf = ckmalloc(IBUFSIZ);
13391 sigmode[SIGCHLD - 1] = S_DFL;
13392 setsignal(SIGCHLD);
13394 /* bash re-enables SIGHUP which is SIG_IGNed on entry.
13395 * Try: "trap '' HUP; bash; echo RET" and type "kill -HUP $$"
13397 signal(SIGHUP, SIG_DFL);
13402 struct stat st1, st2;
13405 for (envp = environ; envp && *envp; envp++) {
13406 p = endofname(*envp);
13407 if (p != *envp && *p == '=') {
13408 setvareq(*envp, VEXPORT|VTEXTFIXED);
13412 setvareq((char*)defoptindvar, VTEXTFIXED);
13414 setvar0("PPID", utoa(getppid()));
13416 p = lookupvar("SHLVL");
13417 setvar("SHLVL", utoa((p ? atoi(p) : 0) + 1), VEXPORT);
13419 #if BASH_HOSTNAME_VAR
13420 if (!lookupvar("HOSTNAME")) {
13421 struct utsname uts;
13423 setvar0("HOSTNAME", uts.nodename);
13426 p = lookupvar("PWD");
13428 if (p[0] != '/' || stat(p, &st1) || stat(".", &st2)
13429 || st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino
13439 //usage:#define ash_trivial_usage
13440 //usage: "[-/+OPTIONS] [-/+o OPT]... [-c 'SCRIPT' [ARG0 [ARGS]] / FILE [ARGS]]"
13441 //usage:#define ash_full_usage "\n\n"
13442 //usage: "Unix shell interpreter"
13445 * Process the shell command line arguments.
13448 procargs(char **argv)
13451 const char *xminusc;
13456 /* if (xargv[0]) - mmm, this is always true! */
13458 for (i = 0; i < NOPTS; i++)
13461 if (options(/*cmdline:*/ 1)) {
13462 /* it already printed err message */
13463 raise_exception(EXERROR);
13467 if (*xargv == NULL) {
13469 ash_msg_and_raise_error(bb_msg_requires_arg, "-c");
13472 if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
13476 for (i = 0; i < NOPTS; i++)
13477 if (optlist[i] == 2)
13482 /* POSIX 1003.2: first arg after "-c CMD" is $0, remainder $1... */
13487 } else if (!sflag) {
13488 setinputfile(*xargv, 0);
13491 commandname = arg0;
13494 shellparam.p = xargv;
13495 #if ENABLE_ASH_GETOPTS
13496 shellparam.optind = 1;
13497 shellparam.optoff = -1;
13499 /* assert(shellparam.malloced == 0 && shellparam.nparam == 0); */
13501 shellparam.nparam++;
13508 * Read /etc/profile, ~/.profile, $ENV.
13511 read_profile(const char *name)
13513 name = expandstr(name);
13514 if (setinputfile(name, INPUT_PUSH_FILE | INPUT_NOFILE_OK) < 0)
13521 * This routine is called when an error or an interrupt occurs in an
13522 * interactive shell and control is returned to the main command loop.
13523 * (In dash, this function is auto-generated by build machinery).
13532 /* from expand.c: */
13535 /* from input.c: */
13536 g_parsefile->left_in_buffer = 0;
13537 g_parsefile->left_in_line = 0; /* clear input buffer */
13540 /* from redir.c: */
13542 popredir(/*drop:*/ 0, /*restore:*/ 0);
13546 static short profile_buf[16384];
13547 extern int etext();
13551 * Main routine. We initialize things, parse the arguments, execute
13552 * profiles if we're a login shell, and then call cmdloop to execute
13553 * commands. The setjmp call sets up the location to jump to when an
13554 * exception occurs. When an exception occurs the variable "state"
13555 * is used to figure out how far we had gotten.
13557 int ash_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
13558 int ash_main(int argc UNUSED_PARAM, char **argv)
13560 volatile smallint state;
13561 struct jmploc jmploc;
13562 struct stackmark smark;
13564 /* Initialize global data */
13568 #if ENABLE_ASH_ALIAS
13574 monitor(4, etext, profile_buf, sizeof(profile_buf), 50);
13577 #if ENABLE_FEATURE_EDITING
13578 line_input_state = new_line_input_t(FOR_SHELL | WITH_PATH_LOOKUP);
13581 if (setjmp(jmploc.loc)) {
13587 e = exception_type;
13589 if (e == EXEXIT || s == 0 || iflag == 0 || shlvl) {
13593 newline_and_flush(stderr);
13596 popstackmark(&smark);
13597 FORCE_INT_ON; /* enable interrupts */
13606 exception_handler = &jmploc;
13607 rootpid = getpid();
13610 setstackmark(&smark);
13613 TRACE(("Shell args: "));
13614 trace_puts_args(argv);
13617 if (argv[0] && argv[0][0] == '-')
13623 read_profile("/etc/profile");
13626 hp = lookupvar("HOME");
13628 read_profile("$HOME/.profile");
13634 getuid() == geteuid() && getgid() == getegid() &&
13638 const char *shinit = lookupvar("ENV");
13639 if (shinit != NULL && *shinit != '\0')
13640 read_profile(shinit);
13642 popstackmark(&smark);
13646 /* evalstring pushes parsefile stack.
13647 * Ensure we don't falsely claim that 0 (stdin)
13648 * is one of stacked source fds.
13649 * Testcase: ash -c 'exec 1>&0' must not complain. */
13650 // if (!sflag) g_parsefile->pf_fd = -1;
13651 // ^^ not necessary since now we special-case fd 0
13652 // in is_hidden_fd() to not be considered "hidden fd"
13653 evalstring(minusc, 0);
13656 if (sflag || minusc == NULL) {
13657 #if MAX_HISTORY > 0 && ENABLE_FEATURE_EDITING_SAVEHISTORY
13659 const char *hp = lookupvar("HISTFILE");
13661 hp = lookupvar("HOME");
13664 hp = concat_path_file(hp, ".ash_history");
13665 setvar0("HISTFILE", hp);
13668 hp = lookupvar("HISTFILE");
13672 line_input_state->hist_file = hp;
13673 # if ENABLE_FEATURE_SH_HISTFILESIZE
13674 hp = lookupvar("HISTFILESIZE");
13675 line_input_state->max_history = size_from_HISTFILESIZE(hp);
13679 state4: /* XXX ??? - why isn't this before the "if" statement */
13687 extern void _mcleanup(void);
13691 TRACE(("End of main reached\n"));
13698 * Copyright (c) 1989, 1991, 1993, 1994
13699 * The Regents of the University of California. All rights reserved.
13701 * This code is derived from software contributed to Berkeley by
13702 * Kenneth Almquist.
13704 * Redistribution and use in source and binary forms, with or without
13705 * modification, are permitted provided that the following conditions
13707 * 1. Redistributions of source code must retain the above copyright
13708 * notice, this list of conditions and the following disclaimer.
13709 * 2. Redistributions in binary form must reproduce the above copyright
13710 * notice, this list of conditions and the following disclaimer in the
13711 * documentation and/or other materials provided with the distribution.
13712 * 3. Neither the name of the University nor the names of its contributors
13713 * may be used to endorse or promote products derived from this software
13714 * without specific prior written permission.
13716 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
13717 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
13718 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
13719 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
13720 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
13721 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
13722 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
13723 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
13724 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
13725 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF