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.
19 //config: bool "ash (77 kb)"
21 //config: depends on !NOMMU
23 //config: The most complete and most pedantically correct shell included with
24 //config: busybox. This shell is actually a derivative of the Debian 'dash'
25 //config: shell (by Herbert Xu), which was created by porting the 'ash' shell
26 //config: (written by Kenneth Almquist) from NetBSD.
28 //config:# ash options
29 //config:# note: Don't remove !NOMMU part in the next line; it would break
30 //config:# menuconfig's indenting.
31 //config:if !NOMMU && (ASH || SH_IS_ASH || BASH_IS_ASH)
33 //config:config ASH_OPTIMIZE_FOR_SIZE
34 //config: bool "Optimize for size instead of speed"
36 //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
38 //config:config ASH_INTERNAL_GLOB
39 //config: bool "Use internal glob() implementation"
40 //config: default y # Y is bigger, but because of uclibc glob() bug, let Y be default for now
41 //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
43 //config: Do not use glob() function from libc, use internal implementation.
44 //config: Use this if you are getting "glob.h: No such file or directory"
45 //config: or similar build errors.
46 //config: Note that as of now (2017-01), uclibc and musl glob() both have bugs
47 //config: which would break ash if you select N here.
49 //config:config ASH_BASH_COMPAT
50 //config: bool "bash-compatible extensions"
52 //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
54 //config:config ASH_JOB_CONTROL
55 //config: bool "Job control"
57 //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
59 //config:config ASH_ALIAS
60 //config: bool "Alias support"
62 //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
64 //config:config ASH_RANDOM_SUPPORT
65 //config: bool "Pseudorandom generator and $RANDOM variable"
67 //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
69 //config: Enable pseudorandom generator and dynamic variable "$RANDOM".
70 //config: Each read of "$RANDOM" will generate a new pseudorandom value.
71 //config: You can reset the generator by using a specified start value.
72 //config: After "unset RANDOM" the generator will switch off and this
73 //config: variable will no longer have special treatment.
75 //config:config ASH_EXPAND_PRMT
76 //config: bool "Expand prompt string"
78 //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
80 //config: $PS# may contain volatile content, such as backquote commands.
81 //config: This option recreates the prompt string from the environment
82 //config: variable each time it is displayed.
84 //config:config ASH_IDLE_TIMEOUT
85 //config: bool "Idle timeout variable $TMOUT"
87 //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
89 //config: Enable bash-like auto-logout after $TMOUT seconds of idle time.
91 //config:config ASH_MAIL
92 //config: bool "Check for new mail in interactive shell"
94 //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
96 //config: Enable "check for new mail" function:
97 //config: if set, $MAIL file and $MAILPATH list of files
98 //config: are checked for mtime changes, and "you have mail"
99 //config: message is printed if change is detected.
101 //config:config ASH_ECHO
102 //config: bool "echo builtin"
104 //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
106 //config:config ASH_PRINTF
107 //config: bool "printf builtin"
109 //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
111 //config:config ASH_TEST
112 //config: bool "test builtin"
114 //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
116 //config:config ASH_HELP
117 //config: bool "help builtin"
119 //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
121 //config:config ASH_GETOPTS
122 //config: bool "getopts builtin"
124 //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
126 //config:config ASH_CMDCMD
127 //config: bool "command builtin"
129 //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
131 //config: Enable support for the 'command' builtin, which allows
132 //config: you to run the specified command or builtin,
133 //config: even when there is a function with the same name.
135 //config:endif # ash options
137 //applet:IF_ASH(APPLET(ash, BB_DIR_BIN, BB_SUID_DROP))
138 // APPLET_ODDNAME:name main location suid_type help
139 //applet:IF_SH_IS_ASH( APPLET_ODDNAME(sh, ash, BB_DIR_BIN, BB_SUID_DROP, ash))
140 //applet:IF_BASH_IS_ASH(APPLET_ODDNAME(bash, ash, BB_DIR_BIN, BB_SUID_DROP, ash))
142 //kbuild:lib-$(CONFIG_ASH) += ash.o ash_ptr_hack.o shell_common.o
143 //kbuild:lib-$(CONFIG_SH_IS_ASH) += ash.o ash_ptr_hack.o shell_common.o
144 //kbuild:lib-$(CONFIG_BASH_IS_ASH) += ash.o ash_ptr_hack.o shell_common.o
145 //kbuild:lib-$(CONFIG_ASH_RANDOM_SUPPORT) += random.o
148 * DEBUG=1 to compile in debugging ('set -o debug' turns on)
149 * DEBUG=2 to compile in and turn on debugging.
150 * When debugging is on ("set -o debug" was executed, or DEBUG=2),
151 * debugging info is written to ./trace, quit signal generates core dump.
154 /* Tweak debug output verbosity here */
158 #define DEBUG_INTONOFF 0
162 #define JOBS ENABLE_ASH_JOB_CONTROL
166 #include <sys/times.h>
167 #include <sys/utsname.h> /* for setting $HOSTNAME */
168 #include "busybox.h" /* for applet_names */
170 /* So far, all bash compat is controlled by one config option */
171 /* Separate defines document which part of code implements what */
172 /* function keyword */
173 #define BASH_FUNCTION ENABLE_ASH_BASH_COMPAT
174 #define IF_BASH_FUNCTION IF_ASH_BASH_COMPAT
176 #define BASH_REDIR_OUTPUT ENABLE_ASH_BASH_COMPAT
177 #define IF_BASH_REDIR_OUTPUT IF_ASH_BASH_COMPAT
179 #define BASH_DOLLAR_SQUOTE ENABLE_ASH_BASH_COMPAT
180 #define IF_BASH_DOLLAR_SQUOTE IF_ASH_BASH_COMPAT
181 #define BASH_PATTERN_SUBST ENABLE_ASH_BASH_COMPAT
182 #define IF_BASH_PATTERN_SUBST IF_ASH_BASH_COMPAT
183 #define BASH_SUBSTR ENABLE_ASH_BASH_COMPAT
184 #define IF_BASH_SUBSTR IF_ASH_BASH_COMPAT
186 #define BASH_TEST2 (ENABLE_ASH_BASH_COMPAT * ENABLE_ASH_TEST)
187 #define BASH_SOURCE ENABLE_ASH_BASH_COMPAT
188 #define BASH_PIPEFAIL ENABLE_ASH_BASH_COMPAT
189 #define BASH_HOSTNAME_VAR ENABLE_ASH_BASH_COMPAT
190 #define BASH_SHLVL_VAR ENABLE_ASH_BASH_COMPAT
191 #define BASH_XTRACEFD ENABLE_ASH_BASH_COMPAT
192 #define BASH_READ_D ENABLE_ASH_BASH_COMPAT
193 #define IF_BASH_READ_D IF_ASH_BASH_COMPAT
195 #if defined(__ANDROID_API__) && __ANDROID_API__ <= 24
196 /* Bionic at least up to version 24 has no glob() */
197 # undef ENABLE_ASH_INTERNAL_GLOB
198 # define ENABLE_ASH_INTERNAL_GLOB 1
201 #if !ENABLE_ASH_INTERNAL_GLOB && defined(__UCLIBC__)
202 # error uClibc glob() is buggy, use ASH_INTERNAL_GLOB.
203 # error The bug is: for "$PWD"/<pattern> ash will escape e.g. dashes in "$PWD"
204 # error with backslash, even ones which do not need to be: "/a-b" -> "/a\-b"
205 # error glob() should unbackslash them and match. uClibc does not unbackslash,
206 # error fails to match dirname, subsequently not expanding <pattern> in it.
208 // if (glob("/etc/polkit\\-1", 0, NULL, &pglob)) - this returns 0 on uclibc, no bug
209 // if (glob("/etc/polkit\\-1/*", 0, NULL, &pglob)) printf("uclibc bug!\n");
212 #if !ENABLE_ASH_INTERNAL_GLOB
217 #include "shell_common.h"
218 #if ENABLE_FEATURE_SH_MATH
221 typedef long arith_t;
222 # define ARITH_FMT "%ld"
224 #if ENABLE_ASH_RANDOM_SUPPORT
227 # define CLEAR_RANDOM_T(rnd) ((void)0)
230 #include "NUM_APPLETS.h"
232 /* STANDALONE does not make sense, and won't compile */
233 # undef CONFIG_FEATURE_SH_STANDALONE
234 # undef ENABLE_FEATURE_SH_STANDALONE
235 # undef IF_FEATURE_SH_STANDALONE
236 # undef IF_NOT_FEATURE_SH_STANDALONE
237 # define ENABLE_FEATURE_SH_STANDALONE 0
238 # define IF_FEATURE_SH_STANDALONE(...)
239 # define IF_NOT_FEATURE_SH_STANDALONE(...) __VA_ARGS__
243 # define PIPE_BUF 4096 /* amount of buffering in a pipe */
247 # error "Do not even bother, ash will not run on NOMMU machine"
251 /* ============ Hash table sizes. Configurable. */
255 #define CMDTABLESIZE 31 /* should be prime */
258 /* ============ Shell options */
260 static const char *const optletters_optnames[] = {
284 #define optletters(n) optletters_optnames[n][0]
285 #define optnames(n) (optletters_optnames[n] + 1)
287 enum { NOPTS = ARRAY_SIZE(optletters_optnames) };
290 /* ============ Misc data */
292 #define msg_illnum "Illegal number: %s"
295 * We enclose jmp_buf in a structure so that we can declare pointers to
296 * jump locations. The global variable handler contains the location to
297 * jump to when an exception occurs, and the global variable exception_type
298 * contains a code identifying the exception. To implement nested
299 * exception handlers, the user should save the value of handler on entry
300 * to an inner scope, set handler to point to a jmploc structure for the
301 * inner scope, and restore handler on exit from the scope.
307 struct globals_misc {
308 uint8_t exitstatus; /* exit status of last command */
309 uint8_t back_exitstatus;/* exit status of backquoted command */
310 smallint job_warning; /* user was warned about stopped jobs (can be 2, 1 or 0). */
311 int rootpid; /* pid of main shell */
312 /* shell level: 0 for the main shell, 1 for its children, and so on */
314 #define rootshell (!shlvl)
315 char *minusc; /* argument to -c option */
317 char *curdir; // = nullstr; /* current working directory */
318 char *physdir; // = nullstr; /* physical working directory */
320 char *arg0; /* value of $0 */
322 struct jmploc *exception_handler;
324 volatile int suppress_int; /* counter */
325 volatile /*sig_atomic_t*/ smallint pending_int; /* 1 = got SIGINT */
326 volatile /*sig_atomic_t*/ smallint got_sigchld; /* 1 = got SIGCHLD */
327 volatile /*sig_atomic_t*/ smallint pending_sig; /* last pending signal */
328 smallint exception_type; /* kind of exception (0..5) */
330 #define EXINT 0 /* SIGINT received */
331 #define EXERROR 1 /* a generic error */
332 #define EXEXIT 4 /* exit the shell */
334 char nullstr[1]; /* zero length string */
337 #define eflag optlist[0]
338 #define fflag optlist[1]
339 #define Iflag optlist[2]
340 #define iflag optlist[3]
341 #define mflag optlist[4]
342 #define nflag optlist[5]
343 #define sflag optlist[6]
344 #define xflag optlist[7]
345 #define vflag optlist[8]
346 #define Cflag optlist[9]
347 #define aflag optlist[10]
348 #define bflag optlist[11]
349 #define uflag optlist[12]
350 #define viflag optlist[13]
352 # define pipefail optlist[14]
357 # define nolog optlist[14 + BASH_PIPEFAIL]
358 # define debug optlist[15 + BASH_PIPEFAIL]
361 /* trap handler commands */
363 * Sigmode records the current value of the signal handlers for the various
364 * modes. A value of zero means that the current handler is not known.
365 * S_HARD_IGN indicates that the signal was ignored on entry to the shell.
367 char sigmode[NSIG - 1];
368 #define S_DFL 1 /* default signal handling (SIG_DFL) */
369 #define S_CATCH 2 /* signal is caught */
370 #define S_IGN 3 /* signal is ignored (SIG_IGN) */
371 #define S_HARD_IGN 4 /* signal is ignored permanently (it was SIG_IGN on entry to shell) */
373 /* indicates specified signal received */
374 uint8_t gotsig[NSIG - 1]; /* offset by 1: "signal" 0 is meaningless */
375 uint8_t may_have_traps; /* 0: definitely no traps are set, 1: some traps may be set */
377 char **trap_ptr; /* used only by "trap hack" */
379 /* Rarely referenced stuff */
380 #if ENABLE_ASH_RANDOM_SUPPORT
383 pid_t backgndpid; /* pid of last background process */
385 extern struct globals_misc *const ash_ptr_to_globals_misc;
386 #define G_misc (*ash_ptr_to_globals_misc)
387 #define exitstatus (G_misc.exitstatus )
388 #define back_exitstatus (G_misc.back_exitstatus )
389 #define job_warning (G_misc.job_warning)
390 #define rootpid (G_misc.rootpid )
391 #define shlvl (G_misc.shlvl )
392 #define minusc (G_misc.minusc )
393 #define curdir (G_misc.curdir )
394 #define physdir (G_misc.physdir )
395 #define arg0 (G_misc.arg0 )
396 #define exception_handler (G_misc.exception_handler)
397 #define exception_type (G_misc.exception_type )
398 #define suppress_int (G_misc.suppress_int )
399 #define pending_int (G_misc.pending_int )
400 #define got_sigchld (G_misc.got_sigchld )
401 #define pending_sig (G_misc.pending_sig )
402 #define nullstr (G_misc.nullstr )
403 #define optlist (G_misc.optlist )
404 #define sigmode (G_misc.sigmode )
405 #define gotsig (G_misc.gotsig )
406 #define may_have_traps (G_misc.may_have_traps )
407 #define trap (G_misc.trap )
408 #define trap_ptr (G_misc.trap_ptr )
409 #define random_gen (G_misc.random_gen )
410 #define backgndpid (G_misc.backgndpid )
411 #define INIT_G_misc() do { \
412 (*(struct globals_misc**)&ash_ptr_to_globals_misc) = xzalloc(sizeof(G_misc)); \
420 /* ============ DEBUG */
422 static void trace_printf(const char *fmt, ...);
423 static void trace_vprintf(const char *fmt, va_list va);
424 # define TRACE(param) trace_printf param
425 # define TRACEV(param) trace_vprintf param
426 # define close(fd) do { \
428 if (close(dfd) < 0) \
429 bb_error_msg("bug on %d: closing %d(0x%x)", \
430 __LINE__, dfd, dfd); \
433 # define TRACE(param)
434 # define TRACEV(param)
438 /* ============ Utility functions */
439 #define is_name(c) ((c) == '_' || isalpha((unsigned char)(c)))
440 #define is_in_name(c) ((c) == '_' || isalnum((unsigned char)(c)))
443 isdigit_str9(const char *str)
445 int maxlen = 9 + 1; /* max 9 digits: 999999999 */
446 while (--maxlen && isdigit(*str))
448 return (*str == '\0');
452 var_end(const char *var)
461 /* ============ Interrupts / exceptions */
463 static void exitshell(void) NORETURN;
466 * These macros allow the user to suspend the handling of interrupt signals
467 * over a period of time. This is similar to SIGHOLD or to sigblock, but
468 * much more efficient and portable. (But hacking the kernel is so much
469 * more fun than worrying about efficiency and portability. :-))
472 # define INT_OFF do { \
473 TRACE(("%s:%d INT_OFF(%d)\n", __func__, __LINE__, suppress_int)); \
478 # define INT_OFF do { \
485 * Called to raise an exception. Since C doesn't include exceptions, we
486 * just do a longjmp to the exception handler. The type of exception is
487 * stored in the global variable "exception_type".
489 static void raise_exception(int) NORETURN;
491 raise_exception(int e)
494 if (exception_handler == NULL)
499 longjmp(exception_handler->loc, 1);
502 #define raise_exception(e) do { \
503 TRACE(("raising exception %d on line %d\n", (e), __LINE__)); \
504 raise_exception(e); \
509 * Called when a SIGINT is received. (If the user specifies
510 * that SIGINT is to be trapped or ignored using the trap builtin, then
511 * this routine is not called.) Suppressint is nonzero when interrupts
512 * are held using the INT_OFF macro. (The test for iflag is just
513 * defensive programming.)
515 static void raise_interrupt(void) NORETURN;
517 raise_interrupt(void)
520 /* Signal is not automatically unmasked after it is raised,
521 * do it ourself - unmask all signals */
522 sigprocmask_allsigs(SIG_UNBLOCK);
523 /* pending_sig = 0; - now done in signal_handler() */
525 if (!(rootshell && iflag)) {
526 /* Kill ourself with SIGINT */
527 signal(SIGINT, SIG_DFL);
530 /* bash: ^C even on empty command line sets $? */
531 exitstatus = SIGINT + 128;
532 raise_exception(EXINT);
536 #define raise_interrupt() do { \
537 TRACE(("raising interrupt on line %d\n", __LINE__)); \
542 static IF_ASH_OPTIMIZE_FOR_SIZE(inline) void
546 if (--suppress_int == 0 && pending_int) {
551 # define INT_ON do { \
552 TRACE(("%s:%d INT_ON(%d)\n", __func__, __LINE__, suppress_int-1)); \
556 # define INT_ON int_on()
558 static IF_ASH_OPTIMIZE_FOR_SIZE(inline) void
566 #define FORCE_INT_ON force_int_on()
568 #define SAVE_INT(v) ((v) = suppress_int)
570 #define RESTORE_INT(v) do { \
572 suppress_int = (v); \
573 if (suppress_int == 0 && pending_int) \
578 /* ============ Stdout/stderr output */
581 outstr(const char *p, FILE *file)
589 flush_stdout_stderr(void)
596 /* Was called outcslow(c,FILE*), but c was always '\n' */
598 newline_and_flush(FILE *dest)
606 static int out1fmt(const char *, ...) __attribute__((__format__(__printf__,1,2)));
608 out1fmt(const char *fmt, ...)
615 r = vprintf(fmt, ap);
621 static int fmtstr(char *, size_t, const char *, ...) __attribute__((__format__(__printf__,3,4)));
623 fmtstr(char *outbuf, size_t length, const char *fmt, ...)
630 ret = vsnprintf(outbuf, length, fmt, ap);
637 out1str(const char *p)
643 out2str(const char *p)
646 flush_stdout_stderr();
650 /* ============ Parser structures */
652 /* control characters in argument strings */
653 #define CTL_FIRST CTLESC
654 #define CTLESC ((unsigned char)'\201') /* escape next character */
655 #define CTLVAR ((unsigned char)'\202') /* variable defn */
656 #define CTLENDVAR ((unsigned char)'\203')
657 #define CTLBACKQ ((unsigned char)'\204')
658 #define CTLARI ((unsigned char)'\206') /* arithmetic expression */
659 #define CTLENDARI ((unsigned char)'\207')
660 #define CTLQUOTEMARK ((unsigned char)'\210')
661 #define CTL_LAST CTLQUOTEMARK
663 /* variable substitution byte (follows CTLVAR) */
664 #define VSTYPE 0x0f /* type of variable substitution */
665 #define VSNUL 0x10 /* colon--treat the empty string as unset */
667 /* values of VSTYPE field */
668 #define VSNORMAL 0x1 /* normal variable: $var or ${var} */
669 #define VSMINUS 0x2 /* ${var-text} */
670 #define VSPLUS 0x3 /* ${var+text} */
671 #define VSQUESTION 0x4 /* ${var?message} */
672 #define VSASSIGN 0x5 /* ${var=text} */
673 #define VSTRIMRIGHT 0x6 /* ${var%pattern} */
674 #define VSTRIMRIGHTMAX 0x7 /* ${var%%pattern} */
675 #define VSTRIMLEFT 0x8 /* ${var#pattern} */
676 #define VSTRIMLEFTMAX 0x9 /* ${var##pattern} */
677 #define VSLENGTH 0xa /* ${#var} */
679 #define VSSUBSTR 0xc /* ${var:position:length} */
681 #if BASH_PATTERN_SUBST
682 #define VSREPLACE 0xd /* ${var/pattern/replacement} */
683 #define VSREPLACEALL 0xe /* ${var//pattern/replacement} */
686 static const char dolatstr[] ALIGN1 = {
687 CTLQUOTEMARK, CTLVAR, VSNORMAL, '@', '=', CTLQUOTEMARK, '\0'
689 #define DOLATSTRLEN 6
708 #if BASH_REDIR_OUTPUT
725 smallint type; /* Nxxxx */
728 union node *redirect;
733 smallint pipe_backgnd;
734 struct nodelist *cmdlist;
740 union node *redirect;
753 union node *elsepart;
780 struct nodelist *backquote;
783 /* nfile and ndup layout must match!
784 * NTOFD (>&fdnum) uses ndup structure, but we may discover mid-flight
785 * that it is actually NTO2 (>&file), and change its type.
802 char *_unused_expfname;
821 struct nredir nredir;
822 struct nbinary nbinary;
826 struct nclist nclist;
835 * NODE_EOF is returned by parsecmd when it encounters an end of file.
836 * It must be distinct from NULL.
838 #define NODE_EOF ((union node *) -1L)
841 struct nodelist *next;
854 freefunc(struct funcnode *f)
856 if (f && --f->count < 0)
861 /* ============ Debugging output */
865 static FILE *tracefile;
868 trace_printf(const char *fmt, ...)
875 fprintf(tracefile, "%u ", (int) time(NULL));
877 fprintf(tracefile, "[%u] ", (int) getpid());
879 fprintf(tracefile, "pending s:%d i:%d(supp:%d) ", pending_sig, pending_int, suppress_int);
881 vfprintf(tracefile, fmt, va);
886 trace_vprintf(const char *fmt, va_list va)
890 vfprintf(tracefile, fmt, va);
891 fprintf(tracefile, "\n");
895 trace_puts(const char *s)
903 trace_puts_quoted(char *s)
910 putc('"', tracefile);
911 for (p = s; *p; p++) {
912 switch ((unsigned char)*p) {
913 case '\n': c = 'n'; goto backslash;
914 case '\t': c = 't'; goto backslash;
915 case '\r': c = 'r'; goto backslash;
916 case '\"': c = '\"'; goto backslash;
917 case '\\': c = '\\'; goto backslash;
918 case CTLESC: c = 'e'; goto backslash;
919 case CTLVAR: c = 'v'; goto backslash;
920 case CTLBACKQ: c = 'q'; goto backslash;
922 putc('\\', tracefile);
926 if (*p >= ' ' && *p <= '~')
929 putc('\\', tracefile);
930 putc((*p >> 6) & 03, tracefile);
931 putc((*p >> 3) & 07, tracefile);
932 putc(*p & 07, tracefile);
937 putc('"', tracefile);
941 trace_puts_args(char **ap)
948 trace_puts_quoted(*ap);
950 putc('\n', tracefile);
953 putc(' ', tracefile);
968 /* leave open because libedit might be using it */
971 strcpy(s, "./trace");
973 if (!freopen(s, "a", tracefile)) {
974 fprintf(stderr, "Can't re-open %s\n", s);
979 tracefile = fopen(s, "a");
980 if (tracefile == NULL) {
981 fprintf(stderr, "Can't open %s\n", s);
987 flags = fcntl(fileno(tracefile), F_GETFL);
989 fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND);
991 setlinebuf(tracefile);
992 fputs("\nTracing started.\n", tracefile);
996 indent(int amount, char *pfx, FILE *fp)
1000 for (i = 0; i < amount; i++) {
1001 if (pfx && i == amount - 1)
1007 /* little circular references here... */
1008 static void shtree(union node *n, int ind, char *pfx, FILE *fp);
1011 sharg(union node *arg, FILE *fp)
1014 struct nodelist *bqlist;
1015 unsigned char subtype;
1017 if (arg->type != NARG) {
1018 out1fmt("<node type %d>\n", arg->type);
1021 bqlist = arg->narg.backquote;
1022 for (p = arg->narg.text; *p; p++) {
1023 switch ((unsigned char)*p) {
1032 if (subtype == VSLENGTH)
1040 if (subtype & VSNUL)
1043 switch (subtype & VSTYPE) {
1069 case VSTRIMRIGHTMAX:
1076 out1fmt("<subtype %d>", subtype);
1085 shtree(bqlist->n, -1, NULL, fp);
1096 shcmd(union node *cmd, FILE *fp)
1104 for (np = cmd->ncmd.args; np; np = np->narg.next) {
1110 for (np = cmd->ncmd.redirect; np; np = np->nfile.next) {
1114 switch (np->nfile.type) {
1115 case NTO: s = ">>"+1; dftfd = 1; break;
1116 case NCLOBBER: s = ">|"; dftfd = 1; break;
1117 case NAPPEND: s = ">>"; dftfd = 1; break;
1118 #if BASH_REDIR_OUTPUT
1121 case NTOFD: s = ">&"; dftfd = 1; break;
1122 case NFROM: s = "<"; break;
1123 case NFROMFD: s = "<&"; break;
1124 case NFROMTO: s = "<>"; break;
1125 default: s = "*error*"; break;
1127 if (np->nfile.fd != dftfd)
1128 fprintf(fp, "%d", np->nfile.fd);
1130 if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) {
1131 fprintf(fp, "%d", np->ndup.dupfd);
1133 sharg(np->nfile.fname, fp);
1140 shtree(union node *n, int ind, char *pfx, FILE *fp)
1142 struct nodelist *lp;
1148 indent(ind, pfx, fp);
1150 if (n == NODE_EOF) {
1165 shtree(n->nbinary.ch1, ind, NULL, fp);
1168 shtree(n->nbinary.ch2, ind, NULL, fp);
1176 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
1177 shtree(lp->n, 0, NULL, fp);
1181 if (n->npipe.pipe_backgnd)
1187 fprintf(fp, "<node type %d>", n->type);
1195 showtree(union node *n)
1197 trace_puts("showtree called\n");
1198 shtree(n, 1, NULL, stderr);
1204 /* ============ Parser data */
1207 * ash_vmsg() needs parsefile->fd, hence parsefile definition is moved up.
1210 struct strlist *next;
1217 struct strpush *prev; /* preceding string on stack */
1219 int prev_left_in_line;
1220 #if ENABLE_ASH_ALIAS
1221 struct alias *ap; /* if push was associated with an alias */
1223 char *string; /* remember the string since it may change */
1225 /* Remember last two characters for pungetc. */
1228 /* Number of outstanding calls to pungetc. */
1233 * The parsefile structure pointed to by the global variable parsefile
1234 * contains information about the current file being read.
1237 struct parsefile *prev; /* preceding file on stack */
1238 int linno; /* current line */
1239 int pf_fd; /* file descriptor (or -1 if string) */
1240 int left_in_line; /* number of chars left in this line */
1241 int left_in_buffer; /* number of chars left in this buffer past the line */
1242 char *next_to_pgetc; /* next char in buffer */
1243 char *buf; /* input buffer */
1244 struct strpush *strpush; /* for pushing strings at this level */
1245 struct strpush basestrpush; /* so pushing one is fast */
1247 /* Remember last two characters for pungetc. */
1250 /* Number of outstanding calls to pungetc. */
1254 static struct parsefile basepf; /* top level input file */
1255 static struct parsefile *g_parsefile = &basepf; /* current input file */
1256 static int startlinno; /* line # where last token started */
1257 static char *commandname; /* currently executing command */
1260 /* ============ Message printing */
1263 ash_vmsg(const char *msg, va_list ap)
1265 fprintf(stderr, "%s: ", arg0);
1267 if (strcmp(arg0, commandname))
1268 fprintf(stderr, "%s: ", commandname);
1269 if (!iflag || g_parsefile->pf_fd > 0)
1270 fprintf(stderr, "line %d: ", startlinno);
1272 vfprintf(stderr, msg, ap);
1273 newline_and_flush(stderr);
1277 * Exverror is called to raise the error exception. If the second argument
1278 * is not NULL then error prints an error message using printf style
1279 * formatting. It then raises the error exception.
1281 static void ash_vmsg_and_raise(int, const char *, va_list) NORETURN;
1283 ash_vmsg_and_raise(int cond, const char *msg, va_list ap)
1287 TRACE(("ash_vmsg_and_raise(%d):", cond));
1290 TRACE(("ash_vmsg_and_raise(%d):NULL\n", cond));
1295 flush_stdout_stderr();
1296 raise_exception(cond);
1300 static void ash_msg_and_raise_error(const char *, ...) NORETURN;
1302 ash_msg_and_raise_error(const char *msg, ...)
1309 ash_vmsg_and_raise(EXERROR, msg, ap);
1315 * 'fmt' must be a string literal.
1317 #define ash_msg_and_raise_perror(fmt, ...) ash_msg_and_raise_error(fmt ": "STRERROR_FMT, ##__VA_ARGS__ STRERROR_ERRNO)
1319 static void raise_error_syntax(const char *) NORETURN;
1321 raise_error_syntax(const char *msg)
1323 ash_msg_and_raise_error("syntax error: %s", msg);
1327 static void ash_msg_and_raise(int, const char *, ...) NORETURN;
1329 ash_msg_and_raise(int cond, const char *msg, ...)
1334 ash_vmsg_and_raise(cond, msg, ap);
1340 * error/warning routines for external builtins
1343 ash_msg(const char *fmt, ...)
1353 * Return a string describing an error. The returned string may be a
1354 * pointer to a static buffer that will be overwritten on the next call.
1355 * Action describes the operation that got the error.
1358 errmsg(int e, const char *em)
1360 if (e == ENOENT || e == ENOTDIR) {
1367 /* ============ Memory allocation */
1370 /* I consider these wrappers nearly useless:
1371 * ok, they return you to nearest exception handler, but
1372 * how much memory do you leak in the process, making
1373 * memory starvation worse?
1376 ckrealloc(void * p, size_t nbytes)
1378 p = realloc(p, nbytes);
1380 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1385 ckmalloc(size_t nbytes)
1387 return ckrealloc(NULL, nbytes);
1391 ckzalloc(size_t nbytes)
1393 return memset(ckmalloc(nbytes), 0, nbytes);
1397 ckstrdup(const char *s)
1399 char *p = strdup(s);
1401 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1405 /* Using bbox equivalents. They exit if out of memory */
1406 # define ckrealloc xrealloc
1407 # define ckmalloc xmalloc
1408 # define ckzalloc xzalloc
1409 # define ckstrdup xstrdup
1413 * It appears that grabstackstr() will barf with such alignments
1414 * because stalloc() will return a string allocated in a new stackblock.
1416 #define SHELL_ALIGN(nbytes) (((nbytes) + SHELL_SIZE) & ~SHELL_SIZE)
1418 /* Most machines require the value returned from malloc to be aligned
1419 * in some way. The following macro will get this right
1420 * on many machines. */
1421 SHELL_SIZE = sizeof(union { int i; char *cp; double d; }) - 1,
1422 /* Minimum size of a block */
1423 MINSIZE = SHELL_ALIGN(504),
1426 struct stack_block {
1427 struct stack_block *prev;
1428 char space[MINSIZE];
1432 struct stack_block *stackp;
1438 struct globals_memstack {
1439 struct stack_block *g_stackp; // = &stackbase;
1440 char *g_stacknxt; // = stackbase.space;
1441 char *sstrend; // = stackbase.space + MINSIZE;
1442 size_t g_stacknleft; // = MINSIZE;
1443 struct stack_block stackbase;
1445 extern struct globals_memstack *const ash_ptr_to_globals_memstack;
1446 #define G_memstack (*ash_ptr_to_globals_memstack)
1447 #define g_stackp (G_memstack.g_stackp )
1448 #define g_stacknxt (G_memstack.g_stacknxt )
1449 #define sstrend (G_memstack.sstrend )
1450 #define g_stacknleft (G_memstack.g_stacknleft)
1451 #define stackbase (G_memstack.stackbase )
1452 #define INIT_G_memstack() do { \
1453 (*(struct globals_memstack**)&ash_ptr_to_globals_memstack) = xzalloc(sizeof(G_memstack)); \
1455 g_stackp = &stackbase; \
1456 g_stacknxt = stackbase.space; \
1457 g_stacknleft = MINSIZE; \
1458 sstrend = stackbase.space + MINSIZE; \
1462 #define stackblock() ((void *)g_stacknxt)
1463 #define stackblocksize() g_stacknleft
1466 * Parse trees for commands are allocated in lifo order, so we use a stack
1467 * to make this more efficient, and also to avoid all sorts of exception
1468 * handling code to handle interrupts in the middle of a parse.
1470 * The size 504 was chosen because the Ultrix malloc handles that size
1474 stalloc(size_t nbytes)
1479 aligned = SHELL_ALIGN(nbytes);
1480 if (aligned > g_stacknleft) {
1483 struct stack_block *sp;
1485 blocksize = aligned;
1486 if (blocksize < MINSIZE)
1487 blocksize = MINSIZE;
1488 len = sizeof(struct stack_block) - MINSIZE + blocksize;
1489 if (len < blocksize)
1490 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1493 sp->prev = g_stackp;
1494 g_stacknxt = sp->space;
1495 g_stacknleft = blocksize;
1496 sstrend = g_stacknxt + blocksize;
1501 g_stacknxt += aligned;
1502 g_stacknleft -= aligned;
1507 stzalloc(size_t nbytes)
1509 return memset(stalloc(nbytes), 0, nbytes);
1516 if (!p || (g_stacknxt < (char *)p) || ((char *)p < g_stackp->space)) {
1517 write(STDERR_FILENO, "stunalloc\n", 10);
1521 g_stacknleft += g_stacknxt - (char *)p;
1526 * Like strdup but works with the ash stack.
1529 sstrdup(const char *p)
1531 size_t len = strlen(p) + 1;
1532 return memcpy(stalloc(len), p, len);
1536 grabstackblock(size_t len)
1542 pushstackmark(struct stackmark *mark, size_t len)
1544 mark->stackp = g_stackp;
1545 mark->stacknxt = g_stacknxt;
1546 mark->stacknleft = g_stacknleft;
1547 grabstackblock(len);
1551 setstackmark(struct stackmark *mark)
1553 pushstackmark(mark, g_stacknxt == g_stackp->space && g_stackp != &stackbase);
1557 popstackmark(struct stackmark *mark)
1559 struct stack_block *sp;
1565 while (g_stackp != mark->stackp) {
1567 g_stackp = sp->prev;
1570 g_stacknxt = mark->stacknxt;
1571 g_stacknleft = mark->stacknleft;
1572 sstrend = mark->stacknxt + mark->stacknleft;
1577 * When the parser reads in a string, it wants to stick the string on the
1578 * stack and only adjust the stack pointer when it knows how big the
1579 * string is. Stackblock (defined in stack.h) returns a pointer to a block
1580 * of space on top of the stack and stackblocklen returns the length of
1581 * this block. Growstackblock will grow this space by at least one byte,
1582 * possibly moving it (like realloc). Grabstackblock actually allocates the
1583 * part of the block that has been used.
1586 growstackblock(void)
1590 newlen = g_stacknleft * 2;
1591 if (newlen < g_stacknleft)
1592 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1596 if (g_stacknxt == g_stackp->space && g_stackp != &stackbase) {
1597 struct stack_block *sp;
1598 struct stack_block *prevstackp;
1603 prevstackp = sp->prev;
1604 grosslen = newlen + sizeof(struct stack_block) - MINSIZE;
1605 sp = ckrealloc(sp, grosslen);
1606 sp->prev = prevstackp;
1608 g_stacknxt = sp->space;
1609 g_stacknleft = newlen;
1610 sstrend = sp->space + newlen;
1613 char *oldspace = g_stacknxt;
1614 size_t oldlen = g_stacknleft;
1615 char *p = stalloc(newlen);
1617 /* free the space we just allocated */
1618 g_stacknxt = memcpy(p, oldspace, oldlen);
1619 g_stacknleft += newlen;
1624 * The following routines are somewhat easier to use than the above.
1625 * The user declares a variable of type STACKSTR, which may be declared
1626 * to be a register. The macro STARTSTACKSTR initializes things. Then
1627 * the user uses the macro STPUTC to add characters to the string. In
1628 * effect, STPUTC(c, p) is the same as *p++ = c except that the stack is
1629 * grown as necessary. When the user is done, she can just leave the
1630 * string there and refer to it using stackblock(). Or she can allocate
1631 * the space for it using grabstackstr(). If it is necessary to allow
1632 * someone else to use the stack temporarily and then continue to grow
1633 * the string, the user should use grabstack to allocate the space, and
1634 * then call ungrabstr(p) to return to the previous mode of operation.
1636 * USTPUTC is like STPUTC except that it doesn't check for overflow.
1637 * CHECKSTACKSPACE can be called before USTPUTC to ensure that there
1638 * is space for at least one character.
1643 size_t len = stackblocksize();
1645 return (char *)stackblock() + len;
1649 * Called from CHECKSTRSPACE.
1652 makestrspace(size_t newlen, char *p)
1654 size_t len = p - g_stacknxt;
1660 size = stackblocksize();
1662 if (nleft >= newlen)
1666 return (char *)stackblock() + len;
1670 stack_nputstr(const char *s, size_t n, char *p)
1672 p = makestrspace(n, p);
1673 p = (char *)mempcpy(p, s, n);
1678 stack_putstr(const char *s, char *p)
1680 return stack_nputstr(s, strlen(s), p);
1684 _STPUTC(int c, char *p)
1692 #define STARTSTACKSTR(p) ((p) = stackblock())
1693 #define STPUTC(c, p) ((p) = _STPUTC((c), (p)))
1694 #define CHECKSTRSPACE(n, p) do { \
1697 size_t m = sstrend - q; \
1699 (p) = makestrspace(l, q); \
1701 #define USTPUTC(c, p) (*(p)++ = (c))
1702 #define STACKSTRNUL(p) do { \
1703 if ((p) == sstrend) \
1704 (p) = growstackstr(); \
1707 #define STUNPUTC(p) (--(p))
1708 #define STTOPC(p) ((p)[-1])
1709 #define STADJUST(amount, p) ((p) += (amount))
1711 #define grabstackstr(p) stalloc((char *)(p) - (char *)stackblock())
1712 #define ungrabstackstr(s, p) stunalloc(s)
1713 #define stackstrend() ((void *)sstrend)
1716 /* ============ String helpers */
1719 * prefix -- see if pfx is a prefix of string.
1722 prefix(const char *string, const char *pfx)
1725 if (*pfx++ != *string++)
1728 return (char *) string;
1732 * Check for a valid number. This should be elsewhere.
1735 is_number(const char *p)
1740 } while (*++p != '\0');
1745 * Convert a string of digits to an integer, printing an error message on
1749 number(const char *s)
1752 ash_msg_and_raise_error(msg_illnum, s);
1757 * Produce a single quoted string suitable as input to the shell.
1758 * The return string is allocated on the stack.
1761 single_quote(const char *s)
1771 len = strchrnul(s, '\'') - s;
1773 q = p = makestrspace(len + 3, p);
1776 q = (char *)mempcpy(q, s, len);
1785 do len++; while (*++s == '\'');
1787 q = p = makestrspace(len + 3, p);
1790 q = (char *)mempcpy(q, s - len, len);
1798 return stackblock();
1802 * Produce a possibly single quoted string suitable as input to the shell.
1803 * If quoting was done, the return string is allocated on the stack,
1804 * otherwise a pointer to the original string is returned.
1807 maybe_single_quote(const char *s)
1812 /* Assuming ACSII */
1813 /* quote ctrl_chars space !"#$%&'()* */
1817 if (*p >= ';' && *p <= '?')
1826 /* quote {|}~ DEL and high bytes */
1829 /* Not quoting these: +,-./ 0-9 :@ A-Z ]^_ a-z */
1830 /* TODO: maybe avoid quoting % */
1836 return single_quote(s);
1840 /* ============ nextopt */
1842 static char **argptr; /* argument list for builtin commands */
1843 static char *optionarg; /* set by nextopt (like getopt) */
1844 static char *optptr; /* used by nextopt */
1847 * XXX - should get rid of. Have all builtins use getopt(3).
1848 * The library getopt must have the BSD extension static variable
1849 * "optreset", otherwise it can't be used within the shell safely.
1851 * Standard option processing (a la getopt) for builtin routines.
1852 * The only argument that is passed to nextopt is the option string;
1853 * the other arguments are unnecessary. It returns the character,
1854 * or '\0' on end of input.
1857 nextopt(const char *optstring)
1864 if (p == NULL || *p == '\0') {
1865 /* We ate entire "-param", take next one */
1871 if (*++p == '\0') /* just "-" ? */
1874 if (LONE_DASH(p)) /* "--" ? */
1876 /* p => next "-param" */
1878 /* p => some option char in the middle of a "-param" */
1880 for (q = optstring; *q != c;) {
1882 ash_msg_and_raise_error("illegal option -%c", c);
1890 ash_msg_and_raise_error("no arg for -%c option", c);
1900 /* ============ Shell variables */
1903 int nparam; /* # of positional parameters (without $0) */
1904 #if ENABLE_ASH_GETOPTS
1905 int optind; /* next parameter to be processed by getopts */
1906 int optoff; /* used by getopts */
1908 unsigned char malloced; /* if parameter list dynamically allocated */
1909 char **p; /* parameter list */
1913 * Free the list of positional parameters.
1916 freeparam(volatile struct shparam *param)
1918 if (param->malloced) {
1920 ap = ap1 = param->p;
1927 #if ENABLE_ASH_GETOPTS
1928 static void FAST_FUNC getoptsreset(const char *value);
1932 struct var *next; /* next entry in hash list */
1933 int flags; /* flags are defined above */
1934 const char *var_text; /* name=value */
1935 void (*var_func)(const char *) FAST_FUNC; /* function to be called when */
1936 /* the variable gets set/unset */
1940 struct localvar *next; /* next local variable in list */
1941 struct var *vp; /* the variable that was made local */
1942 int flags; /* saved flags */
1943 const char *text; /* saved text */
1947 #define VEXPORT 0x01 /* variable is exported */
1948 #define VREADONLY 0x02 /* variable cannot be modified */
1949 #define VSTRFIXED 0x04 /* variable struct is statically allocated */
1950 #define VTEXTFIXED 0x08 /* text is statically allocated */
1951 #define VSTACK 0x10 /* text is allocated on the stack */
1952 #define VUNSET 0x20 /* the variable is not set */
1953 #define VNOFUNC 0x40 /* don't call the callback function */
1954 #define VNOSET 0x80 /* do not set variable - just readonly test */
1955 #define VNOSAVE 0x100 /* when text is on the heap before setvareq */
1956 #if ENABLE_ASH_RANDOM_SUPPORT
1957 # define VDYNAMIC 0x200 /* dynamic variable */
1963 /* Need to be before varinit_data[] */
1964 #if ENABLE_LOCALE_SUPPORT
1965 static void FAST_FUNC
1966 change_lc_all(const char *value)
1968 if (value && *value != '\0')
1969 setlocale(LC_ALL, value);
1971 static void FAST_FUNC
1972 change_lc_ctype(const char *value)
1974 if (value && *value != '\0')
1975 setlocale(LC_CTYPE, value);
1979 static void chkmail(void);
1980 static void changemail(const char *var_value) FAST_FUNC;
1982 # define chkmail() ((void)0)
1984 static void changepath(const char *) FAST_FUNC;
1985 #if ENABLE_ASH_RANDOM_SUPPORT
1986 static void change_random(const char *) FAST_FUNC;
1989 static const struct {
1991 const char *var_text;
1992 void (*var_func)(const char *) FAST_FUNC;
1993 } varinit_data[] = {
1995 * Note: VEXPORT would not work correctly here for NOFORK applets:
1996 * some environment strings may be constant.
1998 { VSTRFIXED|VTEXTFIXED , defifsvar , NULL },
2000 { VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL" , changemail },
2001 { VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH" , changemail },
2003 { VSTRFIXED|VTEXTFIXED , bb_PATH_root_path, changepath },
2004 { VSTRFIXED|VTEXTFIXED , "PS1=$ " , NULL },
2005 { VSTRFIXED|VTEXTFIXED , "PS2=> " , NULL },
2006 { VSTRFIXED|VTEXTFIXED , "PS4=+ " , NULL },
2007 #if ENABLE_ASH_GETOPTS
2008 { VSTRFIXED|VTEXTFIXED , defoptindvar, getoptsreset },
2010 #if ENABLE_ASH_RANDOM_SUPPORT
2011 { VSTRFIXED|VTEXTFIXED|VUNSET|VDYNAMIC, "RANDOM", change_random },
2013 #if ENABLE_LOCALE_SUPPORT
2014 { VSTRFIXED|VTEXTFIXED|VUNSET, "LC_ALL" , change_lc_all },
2015 { VSTRFIXED|VTEXTFIXED|VUNSET, "LC_CTYPE" , change_lc_ctype },
2017 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
2018 { VSTRFIXED|VTEXTFIXED|VUNSET, "HISTFILE" , NULL },
2024 struct globals_var {
2025 struct shparam shellparam; /* $@ current positional parameters */
2026 struct redirtab *redirlist;
2027 int preverrout_fd; /* stderr fd: usually 2, unless redirect moved it */
2028 struct var *vartab[VTABSIZE];
2029 struct var varinit[ARRAY_SIZE(varinit_data)];
2031 extern struct globals_var *const ash_ptr_to_globals_var;
2032 #define G_var (*ash_ptr_to_globals_var)
2033 #define shellparam (G_var.shellparam )
2034 //#define redirlist (G_var.redirlist )
2035 #define preverrout_fd (G_var.preverrout_fd)
2036 #define vartab (G_var.vartab )
2037 #define varinit (G_var.varinit )
2038 #define INIT_G_var() do { \
2040 (*(struct globals_var**)&ash_ptr_to_globals_var) = xzalloc(sizeof(G_var)); \
2042 for (i = 0; i < ARRAY_SIZE(varinit_data); i++) { \
2043 varinit[i].flags = varinit_data[i].flags; \
2044 varinit[i].var_text = varinit_data[i].var_text; \
2045 varinit[i].var_func = varinit_data[i].var_func; \
2049 #define vifs varinit[0]
2051 # define vmail (&vifs)[1]
2052 # define vmpath (&vmail)[1]
2053 # define vpath (&vmpath)[1]
2055 # define vpath (&vifs)[1]
2057 #define vps1 (&vpath)[1]
2058 #define vps2 (&vps1)[1]
2059 #define vps4 (&vps2)[1]
2060 #if ENABLE_ASH_GETOPTS
2061 # define voptind (&vps4)[1]
2062 # if ENABLE_ASH_RANDOM_SUPPORT
2063 # define vrandom (&voptind)[1]
2066 # if ENABLE_ASH_RANDOM_SUPPORT
2067 # define vrandom (&vps4)[1]
2072 * The following macros access the values of the above variables.
2073 * They have to skip over the name. They return the null string
2074 * for unset variables.
2076 #define ifsval() (vifs.var_text + 4)
2077 #define ifsset() ((vifs.flags & VUNSET) == 0)
2079 # define mailval() (vmail.var_text + 5)
2080 # define mpathval() (vmpath.var_text + 9)
2081 # define mpathset() ((vmpath.flags & VUNSET) == 0)
2083 #define pathval() (vpath.var_text + 5)
2084 #define ps1val() (vps1.var_text + 4)
2085 #define ps2val() (vps2.var_text + 4)
2086 #define ps4val() (vps4.var_text + 4)
2087 #if ENABLE_ASH_GETOPTS
2088 # define optindval() (voptind.var_text + 7)
2091 #if ENABLE_ASH_GETOPTS
2092 static void FAST_FUNC
2093 getoptsreset(const char *value)
2095 shellparam.optind = 1;
2096 if (is_number(value))
2097 shellparam.optind = number(value) ?: 1;
2098 shellparam.optoff = -1;
2103 * Compares two strings up to the first = or '\0'. The first
2104 * string must be terminated by '='; the second may be terminated by
2105 * either '=' or '\0'.
2108 varcmp(const char *p, const char *q)
2112 while ((c = *p) == (d = *q)) {
2113 if (c == '\0' || c == '=')
2127 * Find the appropriate entry in the hash table from the name.
2129 static struct var **
2130 hashvar(const char *p)
2134 hashval = ((unsigned char) *p) << 4;
2135 while (*p && *p != '=')
2136 hashval += (unsigned char) *p++;
2137 return &vartab[hashval % VTABSIZE];
2141 vpcmp(const void *a, const void *b)
2143 return varcmp(*(const char **)a, *(const char **)b);
2147 * This routine initializes the builtin variables.
2157 * PS1 depends on uid
2159 #if ENABLE_FEATURE_EDITING && ENABLE_FEATURE_EDITING_FANCY_PROMPT
2160 vps1.var_text = "PS1=\\w \\$ ";
2163 vps1.var_text = "PS1=# ";
2166 end = vp + ARRAY_SIZE(varinit);
2168 vpp = hashvar(vp->var_text);
2171 } while (++vp < end);
2174 static struct var **
2175 findvar(struct var **vpp, const char *name)
2177 for (; *vpp; vpp = &(*vpp)->next) {
2178 if (varcmp((*vpp)->var_text, name) == 0) {
2186 * Find the value of a variable. Returns NULL if not set.
2188 static const char* FAST_FUNC
2189 lookupvar(const char *name)
2193 v = *findvar(hashvar(name), name);
2195 #if ENABLE_ASH_RANDOM_SUPPORT
2197 * Dynamic variables are implemented roughly the same way they are
2198 * in bash. Namely, they're "special" so long as they aren't unset.
2199 * As soon as they're unset, they're no longer dynamic, and dynamic
2200 * lookup will no longer happen at that point. -- PFM.
2202 if (v->flags & VDYNAMIC)
2205 if (!(v->flags & VUNSET))
2206 return var_end(v->var_text);
2211 #if ENABLE_UNICODE_SUPPORT
2213 reinit_unicode_for_ash(void)
2215 /* Unicode support should be activated even if LANG is set
2216 * _during_ shell execution, not only if it was set when
2217 * shell was started. Therefore, re-check LANG every time:
2219 if (ENABLE_FEATURE_CHECK_UNICODE_IN_ENV
2220 || ENABLE_UNICODE_USING_LOCALE
2222 const char *s = lookupvar("LC_ALL");
2223 if (!s) s = lookupvar("LC_CTYPE");
2224 if (!s) s = lookupvar("LANG");
2229 # define reinit_unicode_for_ash() ((void)0)
2233 * Search the environment of a builtin command.
2235 static ALWAYS_INLINE const char *
2236 bltinlookup(const char *name)
2238 return lookupvar(name);
2242 * Same as setvar except that the variable and value are passed in
2243 * the first argument as name=value. Since the first argument will
2244 * be actually stored in the table, it should not be a string that
2246 * Called with interrupts off.
2249 setvareq(char *s, int flags)
2251 struct var *vp, **vpp;
2254 flags |= (VEXPORT & (((unsigned) (1 - aflag)) - 1));
2255 vpp = findvar(vpp, s);
2258 if ((vp->flags & (VREADONLY|VDYNAMIC)) == VREADONLY) {
2261 if (flags & VNOSAVE)
2265 ash_msg_and_raise_error("%.*s: is read only", strchrnul(n, '=') - n, n);
2271 if (vp->var_func && !(flags & VNOFUNC))
2272 vp->var_func(var_end(s));
2274 if (!(vp->flags & (VTEXTFIXED|VSTACK)))
2275 free((char*)vp->var_text);
2277 if (((flags & (VEXPORT|VREADONLY|VSTRFIXED|VUNSET)) | (vp->flags & VSTRFIXED)) == VUNSET) {
2281 if ((flags & (VTEXTFIXED|VSTACK|VNOSAVE)) == VNOSAVE)
2286 flags |= vp->flags & ~(VTEXTFIXED|VSTACK|VNOSAVE|VUNSET);
2288 /* variable s is not found */
2291 if ((flags & (VEXPORT|VREADONLY|VSTRFIXED|VUNSET)) == VUNSET)
2293 vp = ckzalloc(sizeof(*vp));
2295 /*vp->func = NULL; - ckzalloc did it */
2298 if (!(flags & (VTEXTFIXED|VSTACK|VNOSAVE)))
2308 * Set the value of a variable. The flags argument is ored with the
2309 * flags of the variable. If val is NULL, the variable is unset.
2312 setvar(const char *name, const char *val, int flags)
2321 q = endofname(name);
2322 p = strchrnul(q, '=');
2324 if (!namelen || p != q)
2325 ash_msg_and_raise_error("%.*s: bad variable name", namelen, name);
2330 vallen = strlen(val);
2334 nameeq = ckmalloc(namelen + vallen + 2);
2335 p = mempcpy(nameeq, name, namelen);
2338 p = mempcpy(p, val, vallen);
2341 vp = setvareq(nameeq, flags | VNOSAVE);
2347 static void FAST_FUNC
2348 setvar0(const char *name, const char *val)
2350 setvar(name, val, 0);
2354 * Unset the specified variable.
2357 unsetvar(const char *s)
2363 * Process a linked list of variable assignments.
2366 listsetvar(struct strlist *list_set_var, int flags)
2368 struct strlist *lp = list_set_var;
2374 setvareq(lp->text, flags);
2381 * Generate a list of variables satisfying the given conditions.
2384 listvars(int on, int off, char ***end)
2395 for (vp = *vpp; vp; vp = vp->next) {
2396 if ((vp->flags & mask) == on) {
2397 if (ep == stackstrend())
2398 ep = growstackstr();
2399 *ep++ = (char*)vp->var_text;
2402 } while (++vpp < vartab + VTABSIZE);
2403 if (ep == stackstrend())
2404 ep = growstackstr();
2408 return grabstackstr(ep);
2412 /* ============ Path search helper
2414 * The variable path (passed by reference) should be set to the start
2415 * of the path before the first call; path_advance will update
2416 * this value as it proceeds. Successive calls to path_advance will return
2417 * the possible path expansions in sequence. If an option (indicated by
2418 * a percent sign) appears in the path entry then the global variable
2419 * pathopt will be set to point to it; otherwise pathopt will be set to
2422 static const char *pathopt; /* set by path_advance */
2425 path_advance(const char **path, const char *name)
2435 for (p = start; *p && *p != ':' && *p != '%'; p++)
2437 len = p - start + strlen(name) + 2; /* "2" is for '/' and '\0' */
2438 while (stackblocksize() < len)
2442 q = mempcpy(q, start, p - start);
2449 while (*p && *p != ':')
2456 return stalloc(len);
2460 /* ============ Prompt */
2462 static smallint doprompt; /* if set, prompt the user */
2463 static smallint needprompt; /* true if interactive and at start of line */
2465 #if ENABLE_FEATURE_EDITING
2466 static line_input_t *line_input_state;
2467 static const char *cmdedit_prompt;
2469 putprompt(const char *s)
2471 if (ENABLE_ASH_EXPAND_PRMT) {
2472 free((char*)cmdedit_prompt);
2473 cmdedit_prompt = ckstrdup(s);
2480 putprompt(const char *s)
2486 /* expandstr() needs parsing machinery, so it is far away ahead... */
2487 static const char *expandstr(const char *ps, int syntax_type);
2488 /* Values for syntax param */
2489 #define BASESYNTAX 0 /* not in quotes */
2490 #define DQSYNTAX 1 /* in double quotes */
2491 #define SQSYNTAX 2 /* in single quotes */
2492 #define ARISYNTAX 3 /* in arithmetic */
2493 #if ENABLE_ASH_EXPAND_PRMT
2494 # define PSSYNTAX 4 /* prompt. never passed to SIT() */
2496 /* PSSYNTAX expansion is identical to DQSYNTAX, except keeping '\$' as '\$' */
2499 * called by editline -- any expansions to the prompt should be added here.
2502 setprompt_if(smallint do_set, int whichprompt)
2505 IF_ASH_EXPAND_PRMT(struct stackmark smark;)
2512 switch (whichprompt) {
2522 #if ENABLE_ASH_EXPAND_PRMT
2523 pushstackmark(&smark, stackblocksize());
2524 putprompt(expandstr(prompt, PSSYNTAX));
2525 popstackmark(&smark);
2532 /* ============ The cd and pwd commands */
2534 #define CD_PHYSICAL 1
2544 while ((i = nextopt("LP")) != '\0') {
2546 flags ^= CD_PHYSICAL;
2555 * Update curdir (the name of the current directory) in response to a
2559 updatepwd(const char *dir)
2566 cdcomppath = sstrdup(dir);
2569 if (curdir == nullstr)
2571 new = stack_putstr(curdir, new);
2573 new = makestrspace(strlen(dir) + 2, new);
2574 lim = (char *)stackblock() + 1;
2578 if (new > lim && *lim == '/')
2583 if (dir[1] == '/' && dir[2] != '/') {
2589 p = strtok(cdcomppath, "/");
2593 if (p[1] == '.' && p[2] == '\0') {
2605 new = stack_putstr(p, new);
2608 p = strtok(NULL, "/");
2613 return stackblock();
2617 * Find out what the current directory is. If we already know the current
2618 * directory, this routine returns immediately.
2623 char *dir = getcwd(NULL, 0); /* huh, using glibc extension? */
2624 return dir ? dir : nullstr;
2628 setpwd(const char *val, int setold)
2632 oldcur = dir = curdir;
2635 setvar("OLDPWD", oldcur, VEXPORT);
2638 if (physdir != nullstr) {
2639 if (physdir != oldcur)
2643 if (oldcur == val || !val) {
2649 dir = ckstrdup(val);
2650 if (oldcur != dir && oldcur != nullstr) {
2655 setvar("PWD", dir, VEXPORT);
2658 static void hashcd(void);
2661 * Actually do the chdir. We also call hashcd to let other routines
2662 * know that the current directory has changed.
2665 docd(const char *dest, int flags)
2667 const char *dir = NULL;
2670 TRACE(("docd(\"%s\", %d) called\n", dest, flags));
2673 if (!(flags & CD_PHYSICAL)) {
2674 dir = updatepwd(dest);
2688 static int FAST_FUNC
2689 cdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
2701 dest = bltinlookup("HOME");
2702 else if (LONE_DASH(dest)) {
2703 dest = bltinlookup("OLDPWD");
2725 path = bltinlookup("CDPATH");
2728 p = path_advance(&path, dest);
2729 if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
2733 if (!docd(p, flags))
2744 ash_msg_and_raise_perror("can't cd to %s", dest);
2747 if (flags & CD_PRINT)
2748 out1fmt("%s\n", curdir);
2752 static int FAST_FUNC
2753 pwdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
2756 const char *dir = curdir;
2760 if (physdir == nullstr)
2764 out1fmt("%s\n", dir);
2769 /* ============ ... */
2772 #define IBUFSIZ (ENABLE_FEATURE_EDITING ? CONFIG_FEATURE_EDITING_MAX_LEN : 1024)
2774 /* Syntax classes */
2775 #define CWORD 0 /* character is nothing special */
2776 #define CNL 1 /* newline character */
2777 #define CBACK 2 /* a backslash character */
2778 #define CSQUOTE 3 /* single quote */
2779 #define CDQUOTE 4 /* double quote */
2780 #define CENDQUOTE 5 /* a terminating quote */
2781 #define CBQUOTE 6 /* backwards single quote */
2782 #define CVAR 7 /* a dollar sign */
2783 #define CENDVAR 8 /* a '}' character */
2784 #define CLP 9 /* a left paren in arithmetic */
2785 #define CRP 10 /* a right paren in arithmetic */
2786 #define CENDFILE 11 /* end of file */
2787 #define CCTL 12 /* like CWORD, except it must be escaped */
2788 #define CSPCL 13 /* these terminate a word */
2789 #define CIGN 14 /* character should be ignored */
2792 #if ENABLE_ASH_ALIAS
2796 #define USE_SIT_FUNCTION ENABLE_ASH_OPTIMIZE_FOR_SIZE
2798 #if ENABLE_FEATURE_SH_MATH
2799 # define SIT_ITEM(a,b,c,d) (a | (b << 4) | (c << 8) | (d << 12))
2801 # define SIT_ITEM(a,b,c,d) (a | (b << 4) | (c << 8))
2803 static const uint16_t S_I_T[] ALIGN2 = {
2804 #if ENABLE_ASH_ALIAS
2805 SIT_ITEM(CSPCL , CIGN , CIGN , CIGN ), /* 0, PEOA */
2807 SIT_ITEM(CSPCL , CWORD , CWORD, CWORD ), /* 1, ' ' */
2808 SIT_ITEM(CNL , CNL , CNL , CNL ), /* 2, \n */
2809 SIT_ITEM(CWORD , CCTL , CCTL , CWORD ), /* 3, !*-/:=?[]~ */
2810 SIT_ITEM(CDQUOTE , CENDQUOTE, CWORD, CWORD ), /* 4, '"' */
2811 SIT_ITEM(CVAR , CVAR , CWORD, CVAR ), /* 5, $ */
2812 SIT_ITEM(CSQUOTE , CWORD , CENDQUOTE, CWORD), /* 6, "'" */
2813 SIT_ITEM(CSPCL , CWORD , CWORD, CLP ), /* 7, ( */
2814 SIT_ITEM(CSPCL , CWORD , CWORD, CRP ), /* 8, ) */
2815 SIT_ITEM(CBACK , CBACK , CCTL , CBACK ), /* 9, \ */
2816 SIT_ITEM(CBQUOTE , CBQUOTE , CWORD, CBQUOTE), /* 10, ` */
2817 SIT_ITEM(CENDVAR , CENDVAR , CWORD, CENDVAR), /* 11, } */
2818 #if !USE_SIT_FUNCTION
2819 SIT_ITEM(CENDFILE, CENDFILE , CENDFILE, CENDFILE),/* 12, PEOF */
2820 SIT_ITEM(CWORD , CWORD , CWORD, CWORD ), /* 13, 0-9A-Za-z */
2821 SIT_ITEM(CCTL , CCTL , CCTL , CCTL ) /* 14, CTLESC ... */
2825 /* Constants below must match table above */
2827 #if ENABLE_ASH_ALIAS
2828 CSPCL_CIGN_CIGN_CIGN , /* 0 */
2830 CSPCL_CWORD_CWORD_CWORD , /* 1 */
2831 CNL_CNL_CNL_CNL , /* 2 */
2832 CWORD_CCTL_CCTL_CWORD , /* 3 */
2833 CDQUOTE_CENDQUOTE_CWORD_CWORD , /* 4 */
2834 CVAR_CVAR_CWORD_CVAR , /* 5 */
2835 CSQUOTE_CWORD_CENDQUOTE_CWORD , /* 6 */
2836 CSPCL_CWORD_CWORD_CLP , /* 7 */
2837 CSPCL_CWORD_CWORD_CRP , /* 8 */
2838 CBACK_CBACK_CCTL_CBACK , /* 9 */
2839 CBQUOTE_CBQUOTE_CWORD_CBQUOTE , /* 10 */
2840 CENDVAR_CENDVAR_CWORD_CENDVAR , /* 11 */
2841 CENDFILE_CENDFILE_CENDFILE_CENDFILE, /* 12 */
2842 CWORD_CWORD_CWORD_CWORD , /* 13 */
2843 CCTL_CCTL_CCTL_CCTL , /* 14 */
2846 /* c in SIT(c, syntax) must be an *unsigned char* or PEOA or PEOF,
2847 * caller must ensure proper cast on it if c is *char_ptr!
2849 #if USE_SIT_FUNCTION
2852 SIT(int c, int syntax)
2854 /* Used to also have '/' in this string: "\t\n !\"$&'()*-/:;<=>?[\\]`|}~" */
2855 static const char spec_symbls[] ALIGN1 = "\t\n !\"$&'()*-:;<=>?[\\]`|}~";
2857 * This causes '/' to be prepended with CTLESC in dquoted string,
2858 * making "./file"* treated incorrectly because we feed
2859 * ".\/file*" string to glob(), confusing it (see expandmeta func).
2860 * The "homegrown" glob implementation is okay with that,
2861 * but glibc one isn't. With '/' always treated as CWORD,
2864 # if ENABLE_ASH_ALIAS
2865 static const uint8_t syntax_index_table[] ALIGN1 = {
2866 1, 2, 1, 3, 4, 5, 1, 6, /* "\t\n !\"$&'" */
2867 7, 8, 3, 3,/*3,*/3, 1, 1, /* "()*-/:;<" */
2868 3, 1, 3, 3, 9, 3, 10, 1, /* "=>?[\\]`|" */
2872 static const uint8_t syntax_index_table[] ALIGN1 = {
2873 0, 1, 0, 2, 3, 4, 0, 5, /* "\t\n !\"$&'" */
2874 6, 7, 2, 2,/*2,*/2, 0, 0, /* "()*-/:;<" */
2875 2, 0, 2, 2, 8, 2, 9, 0, /* "=>?[\\]`|" */
2884 # if ENABLE_ASH_ALIAS
2890 /* Cast is purely for paranoia here,
2891 * just in case someone passed signed char to us */
2892 if ((unsigned char)c >= CTL_FIRST
2893 && (unsigned char)c <= CTL_LAST
2897 s = strchrnul(spec_symbls, c);
2900 indx = syntax_index_table[s - spec_symbls];
2902 return (S_I_T[indx] >> (syntax*4)) & 0xf;
2905 #else /* !USE_SIT_FUNCTION */
2907 static const uint8_t syntax_index_table[] ALIGN1 = {
2908 /* BASESYNTAX_DQSYNTAX_SQSYNTAX_ARISYNTAX */
2909 /* 0 */ CWORD_CWORD_CWORD_CWORD,
2910 /* 1 */ CWORD_CWORD_CWORD_CWORD,
2911 /* 2 */ CWORD_CWORD_CWORD_CWORD,
2912 /* 3 */ CWORD_CWORD_CWORD_CWORD,
2913 /* 4 */ CWORD_CWORD_CWORD_CWORD,
2914 /* 5 */ CWORD_CWORD_CWORD_CWORD,
2915 /* 6 */ CWORD_CWORD_CWORD_CWORD,
2916 /* 7 */ CWORD_CWORD_CWORD_CWORD,
2917 /* 8 */ CWORD_CWORD_CWORD_CWORD,
2918 /* 9 "\t" */ CSPCL_CWORD_CWORD_CWORD,
2919 /* 10 "\n" */ CNL_CNL_CNL_CNL,
2920 /* 11 */ CWORD_CWORD_CWORD_CWORD,
2921 /* 12 */ CWORD_CWORD_CWORD_CWORD,
2922 /* 13 */ CWORD_CWORD_CWORD_CWORD,
2923 /* 14 */ CWORD_CWORD_CWORD_CWORD,
2924 /* 15 */ CWORD_CWORD_CWORD_CWORD,
2925 /* 16 */ CWORD_CWORD_CWORD_CWORD,
2926 /* 17 */ CWORD_CWORD_CWORD_CWORD,
2927 /* 18 */ CWORD_CWORD_CWORD_CWORD,
2928 /* 19 */ CWORD_CWORD_CWORD_CWORD,
2929 /* 20 */ CWORD_CWORD_CWORD_CWORD,
2930 /* 21 */ CWORD_CWORD_CWORD_CWORD,
2931 /* 22 */ CWORD_CWORD_CWORD_CWORD,
2932 /* 23 */ CWORD_CWORD_CWORD_CWORD,
2933 /* 24 */ CWORD_CWORD_CWORD_CWORD,
2934 /* 25 */ CWORD_CWORD_CWORD_CWORD,
2935 /* 26 */ CWORD_CWORD_CWORD_CWORD,
2936 /* 27 */ CWORD_CWORD_CWORD_CWORD,
2937 /* 28 */ CWORD_CWORD_CWORD_CWORD,
2938 /* 29 */ CWORD_CWORD_CWORD_CWORD,
2939 /* 30 */ CWORD_CWORD_CWORD_CWORD,
2940 /* 31 */ CWORD_CWORD_CWORD_CWORD,
2941 /* 32 " " */ CSPCL_CWORD_CWORD_CWORD,
2942 /* 33 "!" */ CWORD_CCTL_CCTL_CWORD,
2943 /* 34 """ */ CDQUOTE_CENDQUOTE_CWORD_CWORD,
2944 /* 35 "#" */ CWORD_CWORD_CWORD_CWORD,
2945 /* 36 "$" */ CVAR_CVAR_CWORD_CVAR,
2946 /* 37 "%" */ CWORD_CWORD_CWORD_CWORD,
2947 /* 38 "&" */ CSPCL_CWORD_CWORD_CWORD,
2948 /* 39 "'" */ CSQUOTE_CWORD_CENDQUOTE_CWORD,
2949 /* 40 "(" */ CSPCL_CWORD_CWORD_CLP,
2950 /* 41 ")" */ CSPCL_CWORD_CWORD_CRP,
2951 /* 42 "*" */ CWORD_CCTL_CCTL_CWORD,
2952 /* 43 "+" */ CWORD_CWORD_CWORD_CWORD,
2953 /* 44 "," */ CWORD_CWORD_CWORD_CWORD,
2954 /* 45 "-" */ CWORD_CCTL_CCTL_CWORD,
2955 /* 46 "." */ CWORD_CWORD_CWORD_CWORD,
2956 /* "/" was CWORD_CCTL_CCTL_CWORD, see comment in SIT() function why this is changed: */
2957 /* 47 "/" */ CWORD_CWORD_CWORD_CWORD,
2958 /* 48 "0" */ CWORD_CWORD_CWORD_CWORD,
2959 /* 49 "1" */ CWORD_CWORD_CWORD_CWORD,
2960 /* 50 "2" */ CWORD_CWORD_CWORD_CWORD,
2961 /* 51 "3" */ CWORD_CWORD_CWORD_CWORD,
2962 /* 52 "4" */ CWORD_CWORD_CWORD_CWORD,
2963 /* 53 "5" */ CWORD_CWORD_CWORD_CWORD,
2964 /* 54 "6" */ CWORD_CWORD_CWORD_CWORD,
2965 /* 55 "7" */ CWORD_CWORD_CWORD_CWORD,
2966 /* 56 "8" */ CWORD_CWORD_CWORD_CWORD,
2967 /* 57 "9" */ CWORD_CWORD_CWORD_CWORD,
2968 /* 58 ":" */ CWORD_CCTL_CCTL_CWORD,
2969 /* 59 ";" */ CSPCL_CWORD_CWORD_CWORD,
2970 /* 60 "<" */ CSPCL_CWORD_CWORD_CWORD,
2971 /* 61 "=" */ CWORD_CCTL_CCTL_CWORD,
2972 /* 62 ">" */ CSPCL_CWORD_CWORD_CWORD,
2973 /* 63 "?" */ CWORD_CCTL_CCTL_CWORD,
2974 /* 64 "@" */ CWORD_CWORD_CWORD_CWORD,
2975 /* 65 "A" */ CWORD_CWORD_CWORD_CWORD,
2976 /* 66 "B" */ CWORD_CWORD_CWORD_CWORD,
2977 /* 67 "C" */ CWORD_CWORD_CWORD_CWORD,
2978 /* 68 "D" */ CWORD_CWORD_CWORD_CWORD,
2979 /* 69 "E" */ CWORD_CWORD_CWORD_CWORD,
2980 /* 70 "F" */ CWORD_CWORD_CWORD_CWORD,
2981 /* 71 "G" */ CWORD_CWORD_CWORD_CWORD,
2982 /* 72 "H" */ CWORD_CWORD_CWORD_CWORD,
2983 /* 73 "I" */ CWORD_CWORD_CWORD_CWORD,
2984 /* 74 "J" */ CWORD_CWORD_CWORD_CWORD,
2985 /* 75 "K" */ CWORD_CWORD_CWORD_CWORD,
2986 /* 76 "L" */ CWORD_CWORD_CWORD_CWORD,
2987 /* 77 "M" */ CWORD_CWORD_CWORD_CWORD,
2988 /* 78 "N" */ CWORD_CWORD_CWORD_CWORD,
2989 /* 79 "O" */ CWORD_CWORD_CWORD_CWORD,
2990 /* 80 "P" */ CWORD_CWORD_CWORD_CWORD,
2991 /* 81 "Q" */ CWORD_CWORD_CWORD_CWORD,
2992 /* 82 "R" */ CWORD_CWORD_CWORD_CWORD,
2993 /* 83 "S" */ CWORD_CWORD_CWORD_CWORD,
2994 /* 84 "T" */ CWORD_CWORD_CWORD_CWORD,
2995 /* 85 "U" */ CWORD_CWORD_CWORD_CWORD,
2996 /* 86 "V" */ CWORD_CWORD_CWORD_CWORD,
2997 /* 87 "W" */ CWORD_CWORD_CWORD_CWORD,
2998 /* 88 "X" */ CWORD_CWORD_CWORD_CWORD,
2999 /* 89 "Y" */ CWORD_CWORD_CWORD_CWORD,
3000 /* 90 "Z" */ CWORD_CWORD_CWORD_CWORD,
3001 /* 91 "[" */ CWORD_CCTL_CCTL_CWORD,
3002 /* 92 "\" */ CBACK_CBACK_CCTL_CBACK,
3003 /* 93 "]" */ CWORD_CCTL_CCTL_CWORD,
3004 /* 94 "^" */ CWORD_CWORD_CWORD_CWORD,
3005 /* 95 "_" */ CWORD_CWORD_CWORD_CWORD,
3006 /* 96 "`" */ CBQUOTE_CBQUOTE_CWORD_CBQUOTE,
3007 /* 97 "a" */ CWORD_CWORD_CWORD_CWORD,
3008 /* 98 "b" */ CWORD_CWORD_CWORD_CWORD,
3009 /* 99 "c" */ CWORD_CWORD_CWORD_CWORD,
3010 /* 100 "d" */ CWORD_CWORD_CWORD_CWORD,
3011 /* 101 "e" */ CWORD_CWORD_CWORD_CWORD,
3012 /* 102 "f" */ CWORD_CWORD_CWORD_CWORD,
3013 /* 103 "g" */ CWORD_CWORD_CWORD_CWORD,
3014 /* 104 "h" */ CWORD_CWORD_CWORD_CWORD,
3015 /* 105 "i" */ CWORD_CWORD_CWORD_CWORD,
3016 /* 106 "j" */ CWORD_CWORD_CWORD_CWORD,
3017 /* 107 "k" */ CWORD_CWORD_CWORD_CWORD,
3018 /* 108 "l" */ CWORD_CWORD_CWORD_CWORD,
3019 /* 109 "m" */ CWORD_CWORD_CWORD_CWORD,
3020 /* 110 "n" */ CWORD_CWORD_CWORD_CWORD,
3021 /* 111 "o" */ CWORD_CWORD_CWORD_CWORD,
3022 /* 112 "p" */ CWORD_CWORD_CWORD_CWORD,
3023 /* 113 "q" */ CWORD_CWORD_CWORD_CWORD,
3024 /* 114 "r" */ CWORD_CWORD_CWORD_CWORD,
3025 /* 115 "s" */ CWORD_CWORD_CWORD_CWORD,
3026 /* 116 "t" */ CWORD_CWORD_CWORD_CWORD,
3027 /* 117 "u" */ CWORD_CWORD_CWORD_CWORD,
3028 /* 118 "v" */ CWORD_CWORD_CWORD_CWORD,
3029 /* 119 "w" */ CWORD_CWORD_CWORD_CWORD,
3030 /* 120 "x" */ CWORD_CWORD_CWORD_CWORD,
3031 /* 121 "y" */ CWORD_CWORD_CWORD_CWORD,
3032 /* 122 "z" */ CWORD_CWORD_CWORD_CWORD,
3033 /* 123 "{" */ CWORD_CWORD_CWORD_CWORD,
3034 /* 124 "|" */ CSPCL_CWORD_CWORD_CWORD,
3035 /* 125 "}" */ CENDVAR_CENDVAR_CWORD_CENDVAR,
3036 /* 126 "~" */ CWORD_CCTL_CCTL_CWORD,
3037 /* 127 del */ CWORD_CWORD_CWORD_CWORD,
3038 /* 128 0x80 */ CWORD_CWORD_CWORD_CWORD,
3039 /* 129 CTLESC */ CCTL_CCTL_CCTL_CCTL,
3040 /* 130 CTLVAR */ CCTL_CCTL_CCTL_CCTL,
3041 /* 131 CTLENDVAR */ CCTL_CCTL_CCTL_CCTL,
3042 /* 132 CTLBACKQ */ CCTL_CCTL_CCTL_CCTL,
3043 /* 133 CTLQUOTE */ CCTL_CCTL_CCTL_CCTL,
3044 /* 134 CTLARI */ CCTL_CCTL_CCTL_CCTL,
3045 /* 135 CTLENDARI */ CCTL_CCTL_CCTL_CCTL,
3046 /* 136 CTLQUOTEMARK */ CCTL_CCTL_CCTL_CCTL,
3047 /* 137 */ CWORD_CWORD_CWORD_CWORD,
3048 /* 138 */ CWORD_CWORD_CWORD_CWORD,
3049 /* 139 */ CWORD_CWORD_CWORD_CWORD,
3050 /* 140 */ CWORD_CWORD_CWORD_CWORD,
3051 /* 141 */ CWORD_CWORD_CWORD_CWORD,
3052 /* 142 */ CWORD_CWORD_CWORD_CWORD,
3053 /* 143 */ CWORD_CWORD_CWORD_CWORD,
3054 /* 144 */ CWORD_CWORD_CWORD_CWORD,
3055 /* 145 */ CWORD_CWORD_CWORD_CWORD,
3056 /* 146 */ CWORD_CWORD_CWORD_CWORD,
3057 /* 147 */ CWORD_CWORD_CWORD_CWORD,
3058 /* 148 */ CWORD_CWORD_CWORD_CWORD,
3059 /* 149 */ CWORD_CWORD_CWORD_CWORD,
3060 /* 150 */ CWORD_CWORD_CWORD_CWORD,
3061 /* 151 */ CWORD_CWORD_CWORD_CWORD,
3062 /* 152 */ CWORD_CWORD_CWORD_CWORD,
3063 /* 153 */ CWORD_CWORD_CWORD_CWORD,
3064 /* 154 */ CWORD_CWORD_CWORD_CWORD,
3065 /* 155 */ CWORD_CWORD_CWORD_CWORD,
3066 /* 156 */ CWORD_CWORD_CWORD_CWORD,
3067 /* 157 */ CWORD_CWORD_CWORD_CWORD,
3068 /* 158 */ CWORD_CWORD_CWORD_CWORD,
3069 /* 159 */ CWORD_CWORD_CWORD_CWORD,
3070 /* 160 */ CWORD_CWORD_CWORD_CWORD,
3071 /* 161 */ CWORD_CWORD_CWORD_CWORD,
3072 /* 162 */ CWORD_CWORD_CWORD_CWORD,
3073 /* 163 */ CWORD_CWORD_CWORD_CWORD,
3074 /* 164 */ CWORD_CWORD_CWORD_CWORD,
3075 /* 165 */ CWORD_CWORD_CWORD_CWORD,
3076 /* 166 */ CWORD_CWORD_CWORD_CWORD,
3077 /* 167 */ CWORD_CWORD_CWORD_CWORD,
3078 /* 168 */ CWORD_CWORD_CWORD_CWORD,
3079 /* 169 */ CWORD_CWORD_CWORD_CWORD,
3080 /* 170 */ CWORD_CWORD_CWORD_CWORD,
3081 /* 171 */ CWORD_CWORD_CWORD_CWORD,
3082 /* 172 */ CWORD_CWORD_CWORD_CWORD,
3083 /* 173 */ CWORD_CWORD_CWORD_CWORD,
3084 /* 174 */ CWORD_CWORD_CWORD_CWORD,
3085 /* 175 */ CWORD_CWORD_CWORD_CWORD,
3086 /* 176 */ CWORD_CWORD_CWORD_CWORD,
3087 /* 177 */ CWORD_CWORD_CWORD_CWORD,
3088 /* 178 */ CWORD_CWORD_CWORD_CWORD,
3089 /* 179 */ CWORD_CWORD_CWORD_CWORD,
3090 /* 180 */ CWORD_CWORD_CWORD_CWORD,
3091 /* 181 */ CWORD_CWORD_CWORD_CWORD,
3092 /* 182 */ CWORD_CWORD_CWORD_CWORD,
3093 /* 183 */ CWORD_CWORD_CWORD_CWORD,
3094 /* 184 */ CWORD_CWORD_CWORD_CWORD,
3095 /* 185 */ CWORD_CWORD_CWORD_CWORD,
3096 /* 186 */ CWORD_CWORD_CWORD_CWORD,
3097 /* 187 */ CWORD_CWORD_CWORD_CWORD,
3098 /* 188 */ CWORD_CWORD_CWORD_CWORD,
3099 /* 189 */ CWORD_CWORD_CWORD_CWORD,
3100 /* 190 */ CWORD_CWORD_CWORD_CWORD,
3101 /* 191 */ CWORD_CWORD_CWORD_CWORD,
3102 /* 192 */ CWORD_CWORD_CWORD_CWORD,
3103 /* 193 */ CWORD_CWORD_CWORD_CWORD,
3104 /* 194 */ CWORD_CWORD_CWORD_CWORD,
3105 /* 195 */ CWORD_CWORD_CWORD_CWORD,
3106 /* 196 */ CWORD_CWORD_CWORD_CWORD,
3107 /* 197 */ CWORD_CWORD_CWORD_CWORD,
3108 /* 198 */ CWORD_CWORD_CWORD_CWORD,
3109 /* 199 */ CWORD_CWORD_CWORD_CWORD,
3110 /* 200 */ CWORD_CWORD_CWORD_CWORD,
3111 /* 201 */ CWORD_CWORD_CWORD_CWORD,
3112 /* 202 */ CWORD_CWORD_CWORD_CWORD,
3113 /* 203 */ CWORD_CWORD_CWORD_CWORD,
3114 /* 204 */ CWORD_CWORD_CWORD_CWORD,
3115 /* 205 */ CWORD_CWORD_CWORD_CWORD,
3116 /* 206 */ CWORD_CWORD_CWORD_CWORD,
3117 /* 207 */ CWORD_CWORD_CWORD_CWORD,
3118 /* 208 */ CWORD_CWORD_CWORD_CWORD,
3119 /* 209 */ CWORD_CWORD_CWORD_CWORD,
3120 /* 210 */ CWORD_CWORD_CWORD_CWORD,
3121 /* 211 */ CWORD_CWORD_CWORD_CWORD,
3122 /* 212 */ CWORD_CWORD_CWORD_CWORD,
3123 /* 213 */ CWORD_CWORD_CWORD_CWORD,
3124 /* 214 */ CWORD_CWORD_CWORD_CWORD,
3125 /* 215 */ CWORD_CWORD_CWORD_CWORD,
3126 /* 216 */ CWORD_CWORD_CWORD_CWORD,
3127 /* 217 */ CWORD_CWORD_CWORD_CWORD,
3128 /* 218 */ CWORD_CWORD_CWORD_CWORD,
3129 /* 219 */ CWORD_CWORD_CWORD_CWORD,
3130 /* 220 */ CWORD_CWORD_CWORD_CWORD,
3131 /* 221 */ CWORD_CWORD_CWORD_CWORD,
3132 /* 222 */ CWORD_CWORD_CWORD_CWORD,
3133 /* 223 */ CWORD_CWORD_CWORD_CWORD,
3134 /* 224 */ CWORD_CWORD_CWORD_CWORD,
3135 /* 225 */ CWORD_CWORD_CWORD_CWORD,
3136 /* 226 */ CWORD_CWORD_CWORD_CWORD,
3137 /* 227 */ CWORD_CWORD_CWORD_CWORD,
3138 /* 228 */ CWORD_CWORD_CWORD_CWORD,
3139 /* 229 */ CWORD_CWORD_CWORD_CWORD,
3140 /* 230 */ CWORD_CWORD_CWORD_CWORD,
3141 /* 231 */ CWORD_CWORD_CWORD_CWORD,
3142 /* 232 */ CWORD_CWORD_CWORD_CWORD,
3143 /* 233 */ CWORD_CWORD_CWORD_CWORD,
3144 /* 234 */ CWORD_CWORD_CWORD_CWORD,
3145 /* 235 */ CWORD_CWORD_CWORD_CWORD,
3146 /* 236 */ CWORD_CWORD_CWORD_CWORD,
3147 /* 237 */ CWORD_CWORD_CWORD_CWORD,
3148 /* 238 */ CWORD_CWORD_CWORD_CWORD,
3149 /* 239 */ CWORD_CWORD_CWORD_CWORD,
3150 /* 230 */ CWORD_CWORD_CWORD_CWORD,
3151 /* 241 */ CWORD_CWORD_CWORD_CWORD,
3152 /* 242 */ CWORD_CWORD_CWORD_CWORD,
3153 /* 243 */ CWORD_CWORD_CWORD_CWORD,
3154 /* 244 */ CWORD_CWORD_CWORD_CWORD,
3155 /* 245 */ CWORD_CWORD_CWORD_CWORD,
3156 /* 246 */ CWORD_CWORD_CWORD_CWORD,
3157 /* 247 */ CWORD_CWORD_CWORD_CWORD,
3158 /* 248 */ CWORD_CWORD_CWORD_CWORD,
3159 /* 249 */ CWORD_CWORD_CWORD_CWORD,
3160 /* 250 */ CWORD_CWORD_CWORD_CWORD,
3161 /* 251 */ CWORD_CWORD_CWORD_CWORD,
3162 /* 252 */ CWORD_CWORD_CWORD_CWORD,
3163 /* 253 */ CWORD_CWORD_CWORD_CWORD,
3164 /* 254 */ CWORD_CWORD_CWORD_CWORD,
3165 /* 255 */ CWORD_CWORD_CWORD_CWORD,
3166 /* PEOF */ CENDFILE_CENDFILE_CENDFILE_CENDFILE,
3167 # if ENABLE_ASH_ALIAS
3168 /* PEOA */ CSPCL_CIGN_CIGN_CIGN,
3173 # define SIT(c, syntax) ((S_I_T[syntax_index_table[c]] >> ((syntax)*4)) & 0xf)
3174 #else /* debug version, caught one signed char bug */
3175 # define SIT(c, syntax) \
3177 if ((c) < 0 || (c) > (PEOF + ENABLE_ASH_ALIAS)) \
3178 bb_error_msg_and_die("line:%d c:%d", __LINE__, (c)); \
3179 if ((syntax) < 0 || (syntax) > (2 + ENABLE_FEATURE_SH_MATH)) \
3180 bb_error_msg_and_die("line:%d c:%d", __LINE__, (c)); \
3181 ((S_I_T[syntax_index_table[c]] >> ((syntax)*4)) & 0xf); \
3185 #endif /* !USE_SIT_FUNCTION */
3188 /* ============ Alias handling */
3190 #if ENABLE_ASH_ALIAS
3192 #define ALIASINUSE 1
3203 static struct alias **atab; // [ATABSIZE];
3204 #define INIT_G_alias() do { \
3205 atab = xzalloc(ATABSIZE * sizeof(atab[0])); \
3209 static struct alias **
3210 __lookupalias(const char *name)
3212 unsigned int hashval;
3219 ch = (unsigned char)*p;
3223 ch = (unsigned char)*++p;
3225 app = &atab[hashval % ATABSIZE];
3227 for (; *app; app = &(*app)->next) {
3228 if (strcmp(name, (*app)->name) == 0) {
3236 static struct alias *
3237 lookupalias(const char *name, int check)
3239 struct alias *ap = *__lookupalias(name);
3241 if (check && ap && (ap->flag & ALIASINUSE))
3246 static struct alias *
3247 freealias(struct alias *ap)
3251 if (ap->flag & ALIASINUSE) {
3252 ap->flag |= ALIASDEAD;
3264 setalias(const char *name, const char *val)
3266 struct alias *ap, **app;
3268 app = __lookupalias(name);
3272 if (!(ap->flag & ALIASINUSE)) {
3275 ap->val = ckstrdup(val);
3276 ap->flag &= ~ALIASDEAD;
3279 ap = ckzalloc(sizeof(struct alias));
3280 ap->name = ckstrdup(name);
3281 ap->val = ckstrdup(val);
3282 /*ap->flag = 0; - ckzalloc did it */
3283 /*ap->next = NULL;*/
3290 unalias(const char *name)
3294 app = __lookupalias(name);
3298 *app = freealias(*app);
3309 struct alias *ap, **app;
3313 for (i = 0; i < ATABSIZE; i++) {
3315 for (ap = *app; ap; ap = *app) {
3316 *app = freealias(*app);
3326 printalias(const struct alias *ap)
3328 out1fmt("%s=%s\n", ap->name, single_quote(ap->val));
3332 * TODO - sort output
3334 static int FAST_FUNC
3335 aliascmd(int argc UNUSED_PARAM, char **argv)
3344 for (i = 0; i < ATABSIZE; i++) {
3345 for (ap = atab[i]; ap; ap = ap->next) {
3351 while ((n = *++argv) != NULL) {
3352 v = strchr(n+1, '=');
3353 if (v == NULL) { /* n+1: funny ksh stuff */
3354 ap = *__lookupalias(n);
3356 fprintf(stderr, "%s: %s not found\n", "alias", n);
3369 static int FAST_FUNC
3370 unaliascmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
3374 while (nextopt("a") != '\0') {
3378 for (i = 0; *argptr; argptr++) {
3379 if (unalias(*argptr)) {
3380 fprintf(stderr, "%s: %s not found\n", "unalias", *argptr);
3388 #endif /* ASH_ALIAS */
3391 /* Mode argument to forkshell. Don't change FORK_FG or FORK_BG. */
3394 #define FORK_NOJOB 2
3396 /* mode flags for showjob(s) */
3397 #define SHOW_ONLY_PGID 0x01 /* show only pgid (jobs -p) */
3398 #define SHOW_PIDS 0x02 /* show individual pids, not just one line per job */
3399 #define SHOW_CHANGED 0x04 /* only jobs whose state has changed */
3400 #define SHOW_STDERR 0x08 /* print to stderr (else stdout) */
3403 * A job structure contains information about a job. A job is either a
3404 * single process or a set of processes contained in a pipeline. In the
3405 * latter case, pidlist will be non-NULL, and will point to a -1 terminated
3409 pid_t ps_pid; /* process id */
3410 int ps_status; /* last process status from wait() */
3411 char *ps_cmd; /* text of command being run */
3415 struct procstat ps0; /* status of process */
3416 struct procstat *ps; /* status or processes when more than one */
3418 int stopstatus; /* status of a stopped job */
3420 unsigned nprocs; /* number of processes */
3422 #define JOBRUNNING 0 /* at least one proc running */
3423 #define JOBSTOPPED 1 /* all procs are stopped */
3424 #define JOBDONE 2 /* all procs are completed */
3428 sigint: 1, /* job was killed by SIGINT */
3429 jobctl: 1, /* job running under job control */
3431 waited: 1, /* true if this entry has been waited for */
3432 used: 1, /* true if this entry is in used */
3433 changed: 1; /* true if status has changed */
3434 struct job *prev_job; /* previous job */
3437 static struct job *makejob(/*union node *,*/ int);
3438 static int forkshell(struct job *, union node *, int);
3439 static int waitforjob(struct job *);
3442 enum { doing_jobctl = 0 };
3443 #define setjobctl(on) do {} while (0)
3445 static smallint doing_jobctl; //references:8
3446 static void setjobctl(int);
3453 ignoresig(int signo)
3455 /* Avoid unnecessary system calls. Is it already SIG_IGNed? */
3456 if (sigmode[signo - 1] != S_IGN && sigmode[signo - 1] != S_HARD_IGN) {
3457 /* No, need to do it */
3458 signal(signo, SIG_IGN);
3460 sigmode[signo - 1] = S_HARD_IGN;
3464 * Only one usage site - in setsignal()
3467 signal_handler(int signo)
3469 if (signo == SIGCHLD) {
3475 gotsig[signo - 1] = 1;
3476 pending_sig = signo;
3478 if (signo == SIGINT && !trap[SIGINT]) {
3479 if (!suppress_int) {
3481 raise_interrupt(); /* does not return */
3488 * Set the signal handler for the specified signal. The routine figures
3489 * out what it should be set to.
3492 setsignal(int signo)
3495 char cur_act, new_act;
3496 struct sigaction act;
3500 if (t != NULL) { /* trap for this sig is set */
3502 if (t[0] == '\0') /* trap is "": ignore this sig */
3506 if (rootshell && new_act == S_DFL) {
3509 if (iflag || minusc || sflag == 0)
3518 * "In all cases, bash ignores SIGQUIT. Non-builtin
3519 * commands run by bash have signal handlers
3520 * set to the values inherited by the shell
3521 * from its parent". */
3537 /* if !rootshell, we reset SIGQUIT to DFL,
3538 * whereas we have to restore it to what shell got on entry.
3539 * This is handled by the fact that if signal was IGNored on entry,
3540 * then cur_act is S_HARD_IGN and we never change its sigaction
3544 if (signo == SIGCHLD)
3547 t = &sigmode[signo - 1];
3550 /* current setting is not yet known */
3551 if (sigaction(signo, NULL, &act)) {
3552 /* pretend it worked; maybe we should give a warning,
3553 * but other shells don't. We don't alter sigmode,
3554 * so we retry every time.
3555 * btw, in Linux it never fails. --vda */
3558 if (act.sa_handler == SIG_IGN) {
3559 cur_act = S_HARD_IGN;
3561 && (signo == SIGTSTP || signo == SIGTTIN || signo == SIGTTOU)
3563 cur_act = S_IGN; /* don't hard ignore these */
3566 if (act.sa_handler == SIG_DFL && new_act == S_DFL) {
3567 /* installing SIG_DFL over SIG_DFL is a no-op */
3568 /* saves one sigaction call in each "sh -c SCRIPT" invocation */
3573 if (cur_act == S_HARD_IGN || cur_act == new_act)
3578 act.sa_handler = SIG_DFL;
3581 act.sa_handler = signal_handler;
3584 act.sa_handler = SIG_IGN;
3587 /* flags and mask matter only if !DFL and !IGN, but we do it
3588 * for all cases for more deterministic behavior:
3590 act.sa_flags = 0; //TODO: why not SA_RESTART?
3591 sigfillset(&act.sa_mask);
3593 sigaction_set(signo, &act);
3596 /* mode flags for set_curjob */
3597 #define CUR_DELETE 2
3598 #define CUR_RUNNING 1
3599 #define CUR_STOPPED 0
3602 /* pgrp of shell on invocation */
3603 static int initialpgrp; //references:2
3604 static int ttyfd = -1; //5
3607 static struct job *jobtab; //5
3609 static unsigned njobs; //4
3611 static struct job *curjob; //lots
3612 /* number of presumed living untracked jobs */
3613 static int jobless; //4
3616 /* Bash has a feature: it restores termios after a successful wait for
3617 * a foreground job which had at least one stopped or sigkilled member.
3618 * The probable rationale is that SIGSTOP and SIGKILL can preclude task from
3619 * properly restoring tty state. Should we do this too?
3620 * A reproducer: ^Z an interactive python:
3623 * Python 2.7.12 (...)
3625 * { python leaves tty in -icanon -echo state. We do survive that... }
3626 * [1]+ Stopped python
3627 * { ...however, next program (python #2) does not survive it well: }
3629 * Python 2.7.12 (...)
3630 * >>> Traceback (most recent call last):
3631 * { above, I typed "qwerty<CR>", but -echo state is still in effect }
3632 * File "<stdin>", line 1, in <module>
3633 * NameError: name 'qwerty' is not defined
3635 * The implementation below is modeled on bash code and seems to work.
3636 * However, I'm not sure we should do this. For one: what if I'd fg
3637 * the stopped python instead? It'll be confused by "restored" tty state.
3639 static struct termios shell_tty_info;
3643 if (rootshell && ttyfd >= 0)
3644 tcgetattr(ttyfd, &shell_tty_info);
3649 /* if (rootshell) - caller ensures this */
3651 tcsetattr(ttyfd, TCSADRAIN, &shell_tty_info);
3654 job_signal_status(struct job *jp)
3658 struct procstat *ps = jp->ps;
3659 for (i = 0; i < jp->nprocs; i++) {
3660 status = ps[i].ps_status;
3661 if (WIFSIGNALED(status) || WIFSTOPPED(status))
3667 restore_tty_if_stopped_or_signaled(struct job *jp)
3669 //TODO: check what happens if we come from waitforjob() in expbackq()
3671 int s = job_signal_status(jp);
3672 if (s) /* WIFSIGNALED(s) || WIFSTOPPED(s) */
3677 # define get_tty_state() ((void)0)
3678 # define restore_tty_if_stopped_or_signaled(jp) ((void)0)
3682 set_curjob(struct job *jp, unsigned mode)
3685 struct job **jpp, **curp;
3687 /* first remove from list */
3688 jpp = curp = &curjob;
3693 jpp = &jp1->prev_job;
3695 *jpp = jp1->prev_job;
3697 /* Then re-insert in correct position */
3705 /* job being deleted */
3708 /* newly created job or backgrounded job,
3709 * put after all stopped jobs.
3714 if (!jp1 || jp1->state != JOBSTOPPED)
3717 jpp = &jp1->prev_job;
3723 /* newly stopped job - becomes curjob */
3724 jp->prev_job = *jpp;
3732 jobno(const struct job *jp)
3734 return jp - jobtab + 1;
3739 * Convert a job name to a job structure.
3742 #define getjob(name, getctl) getjob(name)
3745 getjob(const char *name, int getctl)
3749 const char *err_msg = "%s: no such job";
3753 char *(*match)(const char *, const char *);
3768 if (c == '+' || c == '%') {
3770 err_msg = "No current job";
3776 err_msg = "No previous job";
3786 if (num > 0 && num <= njobs) {
3787 jp = jobtab + num - 1;
3802 if (match(jp->ps[0].ps_cmd, p)) {
3806 err_msg = "%s: ambiguous";
3816 err_msg = "job %s not created under job control";
3817 if (getctl && jp->jobctl == 0)
3822 ash_msg_and_raise_error(err_msg, name);
3826 * Mark a job structure as unused.
3829 freejob(struct job *jp)
3831 struct procstat *ps;
3835 for (i = jp->nprocs, ps = jp->ps; --i >= 0; ps++) {
3836 if (ps->ps_cmd != nullstr)
3839 if (jp->ps != &jp->ps0)
3842 set_curjob(jp, CUR_DELETE);
3848 xtcsetpgrp(int fd, pid_t pgrp)
3850 if (tcsetpgrp(fd, pgrp))
3851 ash_msg_and_raise_perror("can't set tty process group");
3855 * Turn job control on and off.
3857 * Note: This code assumes that the third arg to ioctl is a character
3858 * pointer, which is true on Berkeley systems but not System V. Since
3859 * System V doesn't have job control yet, this isn't a problem now.
3861 * Called with interrupts off.
3869 if (on == doing_jobctl || rootshell == 0)
3873 ofd = fd = open(_PATH_TTY, O_RDWR);
3875 /* BTW, bash will try to open(ttyname(0)) if open("/dev/tty") fails.
3876 * That sometimes helps to acquire controlling tty.
3877 * Obviously, a workaround for bugs when someone
3878 * failed to provide a controlling tty to bash! :) */
3884 /* fd is a tty at this point */
3885 fd = fcntl(fd, F_DUPFD, 10);
3886 if (ofd >= 0) /* if it is "/dev/tty", close. If 0/1/2, don't */
3889 goto out; /* F_DUPFD failed */
3890 close_on_exec_on(fd);
3891 while (1) { /* while we are in the background */
3892 pgrp = tcgetpgrp(fd);
3895 ash_msg("can't access tty; job control turned off");
3899 if (pgrp == getpgrp())
3910 xtcsetpgrp(fd, pgrp);
3912 /* turning job control off */
3915 /* was xtcsetpgrp, but this can make exiting ash
3916 * loop forever if pty is already deleted */
3917 tcsetpgrp(fd, pgrp);
3931 static int FAST_FUNC
3932 killcmd(int argc, char **argv)
3934 if (argv[1] && strcmp(argv[1], "-l") != 0) {
3937 if (argv[i][0] == '%') {
3939 * "kill %N" - job kill
3940 * Converting to pgrp / pid kill
3946 jp = getjob(argv[i], 0);
3948 * In jobs started under job control, we signal
3949 * entire process group by kill -PGRP_ID.
3950 * This happens, f.e., in interactive shell.
3952 * Otherwise, we signal each child via
3953 * kill PID1 PID2 PID3.
3955 * sh -c 'sleep 1|sleep 1 & kill %1'
3956 * sh -c 'true|sleep 2 & sleep 1; kill %1'
3957 * sh -c 'true|sleep 1 & sleep 2; kill %1'
3959 n = jp->nprocs; /* can't be 0 (I hope) */
3962 dst = alloca(n * sizeof(int)*4);
3964 for (j = 0; j < n; j++) {
3965 struct procstat *ps = &jp->ps[j];
3966 /* Skip non-running and not-stopped members
3967 * (i.e. dead members) of the job
3969 if (ps->ps_status != -1 && !WIFSTOPPED(ps->ps_status))
3972 * kill_main has matching code to expect
3973 * leading space. Needed to not confuse
3974 * negative pids with "kill -SIGNAL_NO" syntax
3976 dst += sprintf(dst, jp->jobctl ? " -%u" : " %u", (int)ps->ps_pid);
3980 } while (argv[++i]);
3982 return kill_main(argc, argv);
3986 showpipe(struct job *jp /*, FILE *out*/)
3988 struct procstat *ps;
3989 struct procstat *psend;
3991 psend = jp->ps + jp->nprocs;
3992 for (ps = jp->ps + 1; ps < psend; ps++)
3993 printf(" | %s", ps->ps_cmd);
3994 newline_and_flush(stdout);
3995 flush_stdout_stderr();
4000 restartjob(struct job *jp, int mode)
4002 struct procstat *ps;
4008 if (jp->state == JOBDONE)
4010 jp->state = JOBRUNNING;
4011 pgid = jp->ps[0].ps_pid;
4012 if (mode == FORK_FG) {
4014 xtcsetpgrp(ttyfd, pgid);
4016 killpg(pgid, SIGCONT);
4020 if (WIFSTOPPED(ps->ps_status)) {
4026 status = (mode == FORK_FG) ? waitforjob(jp) : 0;
4031 static int FAST_FUNC
4032 fg_bgcmd(int argc UNUSED_PARAM, char **argv)
4038 mode = (**argv == 'f') ? FORK_FG : FORK_BG;
4042 jp = getjob(*argv, 1);
4043 if (mode == FORK_BG) {
4044 set_curjob(jp, CUR_RUNNING);
4045 printf("[%d] ", jobno(jp));
4047 out1str(jp->ps[0].ps_cmd);
4048 showpipe(jp /*, stdout*/);
4049 retval = restartjob(jp, mode);
4050 } while (*argv && *++argv);
4056 sprint_status48(char *s, int status, int sigonly)
4062 if (!WIFEXITED(status)) {
4064 if (WIFSTOPPED(status))
4065 st = WSTOPSIG(status);
4068 st = WTERMSIG(status);
4070 if (st == SIGINT || st == SIGPIPE)
4073 if (WIFSTOPPED(status))
4078 //TODO: use bbox's get_signame? strsignal adds ~600 bytes to text+rodata
4079 col = fmtstr(s, 32, strsignal(st));
4080 if (WCOREDUMP(status)) {
4081 strcpy(s + col, " (core dumped)");
4082 col += sizeof(" (core dumped)")-1;
4084 } else if (!sigonly) {
4085 st = WEXITSTATUS(status);
4086 col = fmtstr(s, 16, (st ? "Done(%d)" : "Done"), st);
4093 wait_block_or_sig(int *status)
4100 /* Poll all children for changes in their state */
4102 /* if job control is active, accept stopped processes too */
4103 pid = waitpid(-1, status, doing_jobctl ? (WNOHANG|WUNTRACED) : WNOHANG);
4105 break; /* Error (e.g. EINTR, ECHILD) or pid */
4107 /* Children exist, but none are ready. Sleep until interesting signal */
4110 sigprocmask(SIG_SETMASK, &mask, &mask);
4111 while (!got_sigchld && !pending_sig)
4113 sigprocmask(SIG_SETMASK, &mask, NULL);
4114 #else /* unsafe: a signal can set pending_sig after check, but before pause() */
4115 while (!got_sigchld && !pending_sig)
4119 /* If it was SIGCHLD, poll children again */
4120 } while (got_sigchld);
4125 #define DOWAIT_NONBLOCK 0
4126 #define DOWAIT_BLOCK 1
4127 #define DOWAIT_BLOCK_OR_SIG 2
4130 dowait(int block, struct job *job)
4135 struct job *thisjob = NULL;
4137 TRACE(("dowait(0x%x) called\n", block));
4139 /* It's wrong to call waitpid() outside of INT_OFF region:
4140 * signal can arrive just after syscall return and handler can
4141 * longjmp away, losing stop/exit notification processing.
4142 * Thus, for "jobs" builtin, and for waiting for a fg job,
4143 * we call waitpid() (blocking or non-blocking) inside INT_OFF.
4145 * However, for "wait" builtin it is wrong to simply call waitpid()
4146 * in INT_OFF region: "wait" needs to wait for any running job
4147 * to change state, but should exit on any trap too.
4148 * In INT_OFF region, a signal just before syscall entry can set
4149 * pending_sig variables, but we can't check them, and we would
4150 * either enter a sleeping waitpid() (BUG), or need to busy-loop.
4152 * Because of this, we run inside INT_OFF, but use a special routine
4153 * which combines waitpid() and sigsuspend().
4154 * This is the reason why we need to have a handler for SIGCHLD:
4155 * SIG_DFL handler does not wake sigsuspend().
4158 if (block == DOWAIT_BLOCK_OR_SIG) {
4159 pid = wait_block_or_sig(&status);
4162 if (block == DOWAIT_NONBLOCK)
4163 wait_flags = WNOHANG;
4164 /* if job control is active, accept stopped processes too */
4166 wait_flags |= WUNTRACED;
4167 /* NB: _not_ safe_waitpid, we need to detect EINTR */
4168 pid = waitpid(-1, &status, wait_flags);
4170 TRACE(("wait returns pid=%d, status=0x%x, errno=%d(%s)\n",
4171 pid, status, errno, strerror(errno)));
4176 for (jp = curjob; jp; jp = jp->prev_job) {
4178 struct procstat *ps;
4179 struct procstat *psend;
4180 if (jp->state == JOBDONE)
4184 psend = ps + jp->nprocs;
4186 if (ps->ps_pid == pid) {
4187 TRACE(("Job %d: changing status of proc %d "
4188 "from 0x%x to 0x%x\n",
4189 jobno(jp), pid, ps->ps_status, status));
4190 ps->ps_status = status;
4193 if (ps->ps_status == -1)
4194 jobstate = JOBRUNNING;
4196 if (jobstate == JOBRUNNING)
4198 if (WIFSTOPPED(ps->ps_status)) {
4199 jp->stopstatus = ps->ps_status;
4200 jobstate = JOBSTOPPED;
4203 } while (++ps < psend);
4207 /* Found the job where one of its processes changed its state.
4208 * Is there at least one live and running process in this job? */
4209 if (jobstate != JOBRUNNING) {
4210 /* No. All live processes in the job are stopped
4211 * (JOBSTOPPED) or there are no live processes (JOBDONE)
4213 thisjob->changed = 1;
4214 if (thisjob->state != jobstate) {
4215 TRACE(("Job %d: changing state from %d to %d\n",
4216 jobno(thisjob), thisjob->state, jobstate));
4217 thisjob->state = jobstate;
4219 if (jobstate == JOBSTOPPED)
4220 set_curjob(thisjob, CUR_STOPPED);
4226 /* The process wasn't found in job list */
4228 if (!WIFSTOPPED(status))
4234 if (thisjob && thisjob == job) {
4238 len = sprint_status48(s, status, 1);
4250 showjob(struct job *jp, int mode)
4252 struct procstat *ps;
4253 struct procstat *psend;
4256 char s[16 + 16 + 48];
4257 FILE *out = (mode & SHOW_STDERR ? stderr : stdout);
4261 if (mode & SHOW_ONLY_PGID) { /* jobs -p */
4262 /* just output process (group) id of pipeline */
4263 fprintf(out, "%d\n", ps->ps_pid);
4267 col = fmtstr(s, 16, "[%d] ", jobno(jp));
4272 else if (curjob && jp == curjob->prev_job)
4275 if (mode & SHOW_PIDS)
4276 col += fmtstr(s + col, 16, "%d ", ps->ps_pid);
4278 psend = ps + jp->nprocs;
4280 if (jp->state == JOBRUNNING) {
4281 strcpy(s + col, "Running");
4282 col += sizeof("Running") - 1;
4284 int status = psend[-1].ps_status;
4285 if (jp->state == JOBSTOPPED)
4286 status = jp->stopstatus;
4287 col += sprint_status48(s + col, status, 0);
4289 /* By now, "[JOBID]* [maybe PID] STATUS" is printed */
4291 /* This loop either prints "<cmd1> | <cmd2> | <cmd3>" line
4292 * or prints several "PID | <cmdN>" lines,
4293 * depending on SHOW_PIDS bit.
4294 * We do not print status of individual processes
4295 * between PID and <cmdN>. bash does it, but not very well:
4296 * first line shows overall job status, not process status,
4297 * making it impossible to know 1st process status.
4301 /* for each process */
4304 if (mode & SHOW_PIDS)
4305 col = fmtstr(s, 48, "\n%*c%d ", indent_col, ' ', ps->ps_pid) - 1;
4307 fprintf(out, "%s%*c%s%s",
4309 33 - col >= 0 ? 33 - col : 0, ' ',
4310 ps == jp->ps ? "" : "| ",
4313 } while (++ps != psend);
4314 newline_and_flush(out);
4318 if (jp->state == JOBDONE) {
4319 TRACE(("showjob: freeing job %d\n", jobno(jp)));
4325 * Print a list of jobs. If "change" is nonzero, only print jobs whose
4326 * statuses have changed since the last call to showjobs.
4333 TRACE(("showjobs(0x%x) called\n", mode));
4335 /* Handle all finished jobs */
4336 while (dowait(DOWAIT_NONBLOCK, NULL) > 0)
4339 for (jp = curjob; jp; jp = jp->prev_job) {
4340 if (!(mode & SHOW_CHANGED) || jp->changed) {
4346 static int FAST_FUNC
4347 jobscmd(int argc UNUSED_PARAM, char **argv)
4352 while ((m = nextopt("lp")) != '\0') {
4356 mode |= SHOW_ONLY_PGID;
4362 showjob(getjob(*argv, 0), mode);
4372 /* Called only on finished or stopped jobs (no members are running) */
4374 getstatus(struct job *job)
4378 struct procstat *ps;
4380 /* Fetch last member's status */
4381 ps = job->ps + job->nprocs - 1;
4382 status = ps->ps_status;
4384 /* "set -o pipefail" mode: use last _nonzero_ status */
4385 while (status == 0 && --ps >= job->ps)
4386 status = ps->ps_status;
4389 retval = WEXITSTATUS(status);
4390 if (!WIFEXITED(status)) {
4392 retval = WSTOPSIG(status);
4393 if (!WIFSTOPPED(status))
4396 /* XXX: limits number of signals */
4397 retval = WTERMSIG(status);
4399 if (retval == SIGINT)
4405 TRACE(("getstatus: job %d, nproc %d, status 0x%x, retval 0x%x\n",
4406 jobno(job), job->nprocs, status, retval));
4410 static int FAST_FUNC
4411 waitcmd(int argc UNUSED_PARAM, char **argv)
4422 /* wait for all jobs */
4426 if (!jp) /* no running procs */
4428 if (jp->state == JOBRUNNING)
4434 * "When bash is waiting for an asynchronous command via
4435 * the wait builtin, the reception of a signal for which a trap
4436 * has been set will cause the wait builtin to return immediately
4437 * with an exit status greater than 128, immediately after which
4438 * the trap is executed."
4440 dowait(DOWAIT_BLOCK_OR_SIG, NULL);
4441 /* if child sends us a signal *and immediately exits*,
4442 * dowait() returns pid > 0. Check this case,
4443 * not "if (dowait() < 0)"!
4452 if (**argv != '%') {
4453 pid_t pid = number(*argv);
4458 if (job->ps[job->nprocs - 1].ps_pid == pid)
4460 job = job->prev_job;
4463 job = getjob(*argv, 0);
4465 /* loop until process terminated or stopped */
4466 while (job->state == JOBRUNNING) {
4467 dowait(DOWAIT_BLOCK_OR_SIG, NULL);
4472 retval = getstatus(job);
4479 retval = 128 + pending_sig;
4488 struct job *jp, *jq;
4490 len = njobs * sizeof(*jp);
4492 jp = ckrealloc(jq, len + 4 * sizeof(*jp));
4494 offset = (char *)jp - (char *)jq;
4496 /* Relocate pointers */
4499 jq = (struct job *)((char *)jq + l);
4503 #define joff(p) ((struct job *)((char *)(p) + l))
4504 #define jmove(p) (p) = (void *)((char *)(p) + offset)
4505 if (joff(jp)->ps == &jq->ps0)
4506 jmove(joff(jp)->ps);
4507 if (joff(jp)->prev_job)
4508 jmove(joff(jp)->prev_job);
4518 jp = (struct job *)((char *)jp + len);
4522 } while (--jq >= jp);
4527 * Return a new job structure.
4528 * Called with interrupts off.
4531 makejob(/*union node *node,*/ int nprocs)
4536 for (i = njobs, jp = jobtab; ; jp++) {
4543 if (jp->state != JOBDONE || !jp->waited)
4552 memset(jp, 0, sizeof(*jp));
4554 /* jp->jobctl is a bitfield.
4555 * "jp->jobctl |= doing_jobctl" likely to give awful code */
4559 jp->prev_job = curjob;
4564 jp->ps = ckmalloc(nprocs * sizeof(struct procstat));
4566 TRACE(("makejob(%d) returns %%%d\n", nprocs,
4573 * Return a string identifying a command (to be printed by the
4576 static char *cmdnextc;
4579 cmdputs(const char *s)
4581 static const char vstype[VSTYPE + 1][3] = {
4582 "", "}", "-", "+", "?", "=",
4583 "%", "%%", "#", "##"
4584 IF_BASH_SUBSTR(, ":")
4585 IF_BASH_PATTERN_SUBST(, "/", "//")
4588 const char *p, *str;
4592 unsigned char subtype = 0;
4596 nextc = makestrspace((strlen(s) + 1) * 8, cmdnextc);
4598 while ((c = *p++) != '\0') {
4606 if ((subtype & VSTYPE) == VSLENGTH)
4612 str = "\"}" + !(quoted & 1);
4619 #if ENABLE_FEATURE_SH_MATH
4634 if ((subtype & VSTYPE) != VSNORMAL)
4636 str = vstype[subtype & VSTYPE];
4637 if (subtype & VSNUL)
4646 /* These can only happen inside quotes */
4652 // [1]+ Done true ${\$} <<=== BUG: ${\$} is not a valid way to write $$ (${$} would be ok)
4663 while ((c = *str++) != '\0') {
4666 } /* while *p++ not NUL */
4669 USTPUTC('"', nextc);
4675 /* cmdtxt() and cmdlist() call each other */
4676 static void cmdtxt(union node *n);
4679 cmdlist(union node *np, int sep)
4681 for (; np; np = np->narg.next) {
4685 if (sep && np->narg.next)
4691 cmdtxt(union node *n)
4694 struct nodelist *lp;
4705 lp = n->npipe.cmdlist;
4723 cmdtxt(n->nbinary.ch1);
4739 cmdtxt(n->nif.test);
4741 if (n->nif.elsepart) {
4742 cmdtxt(n->nif.ifpart);
4744 n = n->nif.elsepart;
4762 cmdtxt(n->nbinary.ch1);
4772 cmdputs(n->nfor.var);
4774 cmdlist(n->nfor.args, 1);
4779 cmdputs(n->narg.text);
4783 cmdlist(n->ncmd.args, 1);
4784 cmdlist(n->ncmd.redirect, 0);
4797 cmdputs(n->ncase.expr->narg.text);
4799 for (np = n->ncase.cases; np; np = np->nclist.next) {
4800 cmdtxt(np->nclist.pattern);
4802 cmdtxt(np->nclist.body);
4816 #if BASH_REDIR_OUTPUT
4831 cmdputs(utoa(n->nfile.fd));
4833 if (n->type == NTOFD || n->type == NFROMFD) {
4834 if (n->ndup.dupfd >= 0)
4835 cmdputs(utoa(n->ndup.dupfd));
4846 commandtext(union node *n)
4850 STARTSTACKSTR(cmdnextc);
4852 name = stackblock();
4853 TRACE(("commandtext: name %p, end %p\n", name, cmdnextc));
4854 return ckstrdup(name);
4859 * Fork off a subshell. If we are doing job control, give the subshell its
4860 * own process group. Jp is a job structure that the job is to be added to.
4861 * N is the command that will be evaluated by the child. Both jp and n may
4862 * be NULL. The mode parameter can be one of the following:
4863 * FORK_FG - Fork off a foreground process.
4864 * FORK_BG - Fork off a background process.
4865 * FORK_NOJOB - Like FORK_FG, but don't give the process its own
4866 * process group even if job control is on.
4868 * When job control is turned off, background processes have their standard
4869 * input redirected to /dev/null (except for the second and later processes
4872 * Called with interrupts off.
4875 * Clear traps on a fork.
4883 for (tp = trap; tp < &trap[NSIG]; tp++) {
4884 if (*tp && **tp) { /* trap not NULL or "" (SIG_IGN) */
4885 if (trap_ptr == trap)
4887 /* else: it "belongs" to trap_ptr vector, don't free */
4889 if ((tp - trap) != 0)
4890 setsignal(tp - trap);
4897 /* Lives far away from here, needed for forkchild */
4898 static void closescript(void);
4900 /* Called after fork(), in child */
4901 /* jp and n are NULL when called by openhere() for heredoc support */
4902 static NOINLINE void
4903 forkchild(struct job *jp, union node *n, int mode)
4907 TRACE(("Child shell %d\n", getpid()));
4911 /* man bash: "Non-builtin commands run by bash have signal handlers
4912 * set to the values inherited by the shell from its parent".
4913 * Do we do it correctly? */
4917 if (mode == FORK_NOJOB /* is it `xxx` ? */
4918 && n && n->type == NCMD /* is it single cmd? */
4919 /* && n->ncmd.args->type == NARG - always true? */
4920 && n->ncmd.args && strcmp(n->ncmd.args->narg.text, "trap") == 0
4921 && n->ncmd.args->narg.next == NULL /* "trap" with no arguments */
4922 /* && n->ncmd.args->narg.backquote == NULL - do we need to check this? */
4924 TRACE(("Trap hack\n"));
4925 /* Awful hack for `trap` or $(trap).
4927 * http://www.opengroup.org/onlinepubs/009695399/utilities/trap.html
4928 * contains an example where "trap" is executed in a subshell:
4930 * save_traps=$(trap)
4932 * eval "$save_traps"
4934 * Standard does not say that "trap" in subshell shall print
4935 * parent shell's traps. It only says that its output
4936 * must have suitable form, but then, in the above example
4937 * (which is not supposed to be normative), it implies that.
4939 * bash (and probably other shell) does implement it
4940 * (traps are reset to defaults, but "trap" still shows them),
4941 * but as a result, "trap" logic is hopelessly messed up:
4944 * trap -- 'echo Ho' SIGWINCH <--- we have a handler
4945 * # (trap) <--- trap is in subshell - no output (correct, traps are reset)
4946 * # true | trap <--- trap is in subshell - no output (ditto)
4947 * # echo `true | trap` <--- in subshell - output (but traps are reset!)
4948 * trap -- 'echo Ho' SIGWINCH
4949 * # echo `(trap)` <--- in subshell in subshell - output
4950 * trap -- 'echo Ho' SIGWINCH
4951 * # echo `true | (trap)` <--- in subshell in subshell in subshell - output!
4952 * trap -- 'echo Ho' SIGWINCH
4954 * The rules when to forget and when to not forget traps
4955 * get really complex and nonsensical.
4957 * Our solution: ONLY bare $(trap) or `trap` is special.
4959 /* Save trap handler strings for trap builtin to print */
4960 trap_ptr = xmemdup(trap, sizeof(trap));
4961 /* Fall through into clearing traps */
4965 /* do job control only in root shell */
4967 if (mode != FORK_NOJOB && jp->jobctl && oldlvl == 0) {
4970 if (jp->nprocs == 0)
4973 pgrp = jp->ps[0].ps_pid;
4974 /* this can fail because we are doing it in the parent also */
4976 if (mode == FORK_FG)
4977 xtcsetpgrp(ttyfd, pgrp);
4982 if (mode == FORK_BG) {
4983 /* man bash: "When job control is not in effect,
4984 * asynchronous commands ignore SIGINT and SIGQUIT" */
4987 if (jp->nprocs == 0) {
4989 if (open(bb_dev_null, O_RDONLY) != 0)
4990 ash_msg_and_raise_perror("can't open '%s'", bb_dev_null);
4994 if (iflag) { /* why if iflag only? */
4999 * "In all cases, bash ignores SIGQUIT. Non-builtin
5000 * commands run by bash have signal handlers
5001 * set to the values inherited by the shell
5003 * Take care of the second rule: */
5007 if (n && n->type == NCMD
5008 && n->ncmd.args && strcmp(n->ncmd.args->narg.text, "jobs") == 0
5010 TRACE(("Job hack\n"));
5011 /* "jobs": we do not want to clear job list for it,
5012 * instead we remove only _its_ own_ job from job list.
5013 * This makes "jobs .... | cat" more useful.
5019 for (jp = curjob; jp; jp = jp->prev_job)
5024 /* Called after fork(), in parent */
5026 #define forkparent(jp, n, mode, pid) forkparent(jp, mode, pid)
5029 forkparent(struct job *jp, union node *n, int mode, pid_t pid)
5031 TRACE(("In parent shell: child = %d\n", pid));
5033 /* jp is NULL when called by openhere() for heredoc support */
5034 while (jobless && dowait(DOWAIT_NONBLOCK, NULL) > 0)
5040 if (mode != FORK_NOJOB && jp->jobctl) {
5043 if (jp->nprocs == 0)
5046 pgrp = jp->ps[0].ps_pid;
5047 /* This can fail because we are doing it in the child also */
5051 if (mode == FORK_BG) {
5052 backgndpid = pid; /* set $! */
5053 set_curjob(jp, CUR_RUNNING);
5056 struct procstat *ps = &jp->ps[jp->nprocs++];
5059 ps->ps_cmd = nullstr;
5061 if (doing_jobctl && n)
5062 ps->ps_cmd = commandtext(n);
5067 /* jp and n are NULL when called by openhere() for heredoc support */
5069 forkshell(struct job *jp, union node *n, int mode)
5073 TRACE(("forkshell(%%%d, %p, %d) called\n", jobno(jp), n, mode));
5076 TRACE(("Fork failed, errno=%d", errno));
5079 ash_msg_and_raise_perror("can't fork");
5082 CLEAR_RANDOM_T(&random_gen); /* or else $RANDOM repeats in child */
5083 forkchild(jp, n, mode);
5085 forkparent(jp, n, mode, pid);
5091 * Wait for job to finish.
5093 * Under job control we have the problem that while a child process
5094 * is running interrupts generated by the user are sent to the child
5095 * but not to the shell. This means that an infinite loop started by
5096 * an interactive user may be hard to kill. With job control turned off,
5097 * an interactive user may place an interactive program inside a loop.
5098 * If the interactive program catches interrupts, the user doesn't want
5099 * these interrupts to also abort the loop. The approach we take here
5100 * is to have the shell ignore interrupt signals while waiting for a
5101 * foreground process to terminate, and then send itself an interrupt
5102 * signal if the child process was terminated by an interrupt signal.
5103 * Unfortunately, some programs want to do a bit of cleanup and then
5104 * exit on interrupt; unless these processes terminate themselves by
5105 * sending a signal to themselves (instead of calling exit) they will
5106 * confuse this approach.
5108 * Called with interrupts off.
5111 waitforjob(struct job *jp)
5115 TRACE(("waitforjob(%%%d) called\n", jobno(jp)));
5118 while (jp->state == JOBRUNNING) {
5119 /* In non-interactive shells, we _can_ get
5120 * a keyboard signal here and be EINTRed,
5121 * but we just loop back, waiting for command to complete.
5124 * "If bash is waiting for a command to complete and receives
5125 * a signal for which a trap has been set, the trap
5126 * will not be executed until the command completes."
5128 * Reality is that even if trap is not set, bash
5129 * will not act on the signal until command completes.
5130 * Try this. sleep5intoff.c:
5131 * #include <signal.h>
5132 * #include <unistd.h>
5135 * sigemptyset(&set);
5136 * sigaddset(&set, SIGINT);
5137 * sigaddset(&set, SIGQUIT);
5138 * sigprocmask(SIG_BLOCK, &set, NULL);
5142 * $ bash -c './sleep5intoff; echo hi'
5143 * ^C^C^C^C <--- pressing ^C once a second
5145 * $ bash -c './sleep5intoff; echo hi'
5146 * ^\^\^\^\hi <--- pressing ^\ (SIGQUIT)
5149 dowait(DOWAIT_BLOCK, jp);
5156 xtcsetpgrp(ttyfd, rootpid);
5157 restore_tty_if_stopped_or_signaled(jp);
5160 * This is truly gross.
5161 * If we're doing job control, then we did a TIOCSPGRP which
5162 * caused us (the shell) to no longer be in the controlling
5163 * session -- so we wouldn't have seen any ^C/SIGINT. So, we
5164 * intuit from the subprocess exit status whether a SIGINT
5165 * occurred, and if so interrupt ourselves. Yuck. - mycroft
5167 if (jp->sigint) /* TODO: do the same with all signals */
5168 raise(SIGINT); /* ... by raise(jp->sig) instead? */
5170 if (jp->state == JOBDONE)
5177 * return 1 if there are stopped jobs, otherwise 0
5189 if (jp && jp->state == JOBSTOPPED) {
5190 out2str("You have stopped jobs.\n");
5200 * Code for dealing with input/output redirection.
5205 #define EMPTY -2 /* marks an unused slot in redirtab */
5206 #define CLOSED -1 /* marks a slot of previously-closed fd */
5209 * Handle here documents. Normally we fork off a process to write the
5210 * data to a pipe. If the document is short, we can stuff the data in
5211 * the pipe without forking.
5213 /* openhere needs this forward reference */
5214 static void expandhere(union node *arg, int fd);
5216 openhere(union node *redir)
5222 ash_msg_and_raise_perror("can't create pipe");
5223 if (redir->type == NHERE) {
5224 len = strlen(redir->nhere.doc->narg.text);
5225 if (len <= PIPE_BUF) {
5226 full_write(pip[1], redir->nhere.doc->narg.text, len);
5230 if (forkshell((struct job *)NULL, (union node *)NULL, FORK_NOJOB) == 0) {
5233 ignoresig(SIGINT); //signal(SIGINT, SIG_IGN);
5234 ignoresig(SIGQUIT); //signal(SIGQUIT, SIG_IGN);
5235 ignoresig(SIGHUP); //signal(SIGHUP, SIG_IGN);
5236 ignoresig(SIGTSTP); //signal(SIGTSTP, SIG_IGN);
5237 signal(SIGPIPE, SIG_DFL);
5238 if (redir->type == NHERE)
5239 full_write(pip[1], redir->nhere.doc->narg.text, len);
5241 expandhere(redir->nhere.doc, pip[1]);
5242 _exit(EXIT_SUCCESS);
5250 openredirect(union node *redir)
5256 switch (redir->nfile.type) {
5257 /* Can't happen, our single caller does this itself */
5263 return openhere(redir);
5266 /* For N[X]HERE, reading redir->nfile.expfname would touch beyond
5267 * allocated space. Do it only when we know it is safe.
5269 fname = redir->nfile.expfname;
5271 switch (redir->nfile.type) {
5277 f = open(fname, O_RDONLY);
5282 f = open(fname, O_RDWR|O_CREAT, 0666);
5287 #if BASH_REDIR_OUTPUT
5290 /* Take care of noclobber mode. */
5292 if (stat(fname, &sb) < 0) {
5293 f = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0666);
5296 } else if (!S_ISREG(sb.st_mode)) {
5297 f = open(fname, O_WRONLY, 0666);
5300 if (fstat(f, &sb) < 0 && S_ISREG(sb.st_mode)) {
5313 f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666);
5318 f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666);
5326 ash_msg_and_raise_error("can't create %s: %s", fname, errmsg(errno, "nonexistent directory"));
5328 ash_msg_and_raise_error("can't open %s: %s", fname, errmsg(errno, "no such file"));
5332 * Copy a file descriptor to be >= 10. Throws exception on error.
5340 newfd = fcntl(from, F_DUPFD, 10);
5341 err = newfd < 0 ? errno : 0;
5344 ash_msg_and_raise_perror("%d", from);
5346 fcntl(newfd, F_SETFD, FD_CLOEXEC);
5352 dup2_or_raise(int from, int to)
5356 newfd = (from != to) ? dup2(from, to) : to;
5358 /* Happens when source fd is not open: try "echo >&99" */
5359 ash_msg_and_raise_perror("%d", from);
5364 fcntl_F_DUPFD(int fd, int avoid_fd)
5368 newfd = fcntl(fd, F_DUPFD, avoid_fd + 1);
5378 xdup_CLOEXEC_and_close(int fd, int avoid_fd)
5382 newfd = fcntl(fd, F_DUPFD, avoid_fd + 1);
5388 /* fd was not open? */
5391 ash_msg_and_raise_perror("%d", newfd);
5393 fcntl(newfd, F_SETFD, FD_CLOEXEC);
5398 /* Struct def and variable are moved down to the first usage site */
5404 struct redirtab *next;
5406 struct squirrel two_fd[];
5408 #define redirlist (G_var.redirlist)
5411 add_squirrel_closed(struct redirtab *sq, int fd)
5418 for (i = 0; sq->two_fd[i].orig_fd != EMPTY; i++) {
5419 /* If we collide with an already moved fd... */
5420 if (fd == sq->two_fd[i].orig_fd) {
5422 * "echo 3>FILE 3>&- 3>FILE"
5423 * "echo 3>&- 3>FILE"
5424 * No need for last redirect to insert
5425 * another "need to close 3" indicator.
5427 TRACE(("redirect_fd %d: already moved or closed\n", fd));
5431 TRACE(("redirect_fd %d: previous fd was closed\n", fd));
5432 sq->two_fd[i].orig_fd = fd;
5433 sq->two_fd[i].moved_to = CLOSED;
5437 save_fd_on_redirect(int fd, int avoid_fd, struct redirtab *sq)
5441 if (avoid_fd < 9) /* the important case here is that it can be -1 */
5446 /* Testcase: "ls -l /proc/$$/fd 10>&-" should work */
5447 ttyfd = xdup_CLOEXEC_and_close(ttyfd, avoid_fd);
5448 TRACE(("redirect_fd %d: matches ttyfd, moving it to %d\n", fd, ttyfd));
5449 return 1; /* "we closed fd" */
5452 /* Are we called from redirect(0)? E.g. redirect
5453 * in a forked child. No need to save fds,
5454 * we aren't going to use them anymore, ok to trash.
5459 /* If this one of script's fds? */
5461 struct parsefile *pf = g_parsefile;
5463 /* We skip fd == 0 case because of the following:
5464 * $ ash # running ash interactively
5466 * and in script.sh: "exec 9>&0".
5467 * Even though top-level pf_fd _is_ 0,
5468 * it's still ok to use it: "read" builtin uses it,
5469 * why should we cripple "exec" builtin?
5471 if (fd == pf->pf_fd) {
5472 pf->pf_fd = xdup_CLOEXEC_and_close(fd, avoid_fd);
5473 return 1; /* "we closed fd" */
5479 /* Check whether it collides with any open fds (e.g. stdio), save fds as needed */
5481 /* First: do we collide with some already moved fds? */
5482 for (i = 0; sq->two_fd[i].orig_fd != EMPTY; i++) {
5483 /* If we collide with an already moved fd... */
5484 if (fd == sq->two_fd[i].moved_to) {
5485 new_fd = fcntl_F_DUPFD(fd, avoid_fd);
5486 sq->two_fd[i].moved_to = new_fd;
5487 TRACE(("redirect_fd %d: already busy, moving to %d\n", fd, new_fd));
5488 if (new_fd < 0) /* what? */
5490 return 0; /* "we did not close fd" */
5492 if (fd == sq->two_fd[i].orig_fd) {
5493 /* Example: echo Hello >/dev/null 1>&2 */
5494 TRACE(("redirect_fd %d: already moved\n", fd));
5495 return 0; /* "we did not close fd" */
5499 /* If this fd is open, we move and remember it; if it's closed, new_fd = CLOSED (-1) */
5500 new_fd = fcntl_F_DUPFD(fd, avoid_fd);
5501 TRACE(("redirect_fd %d: previous fd is moved to %d (-1 if it was closed)\n", fd, new_fd));
5505 /* new_fd = CLOSED; - already is -1 */
5507 sq->two_fd[i].moved_to = new_fd;
5508 sq->two_fd[i].orig_fd = fd;
5510 /* if we move stderr, let "set -x" code know */
5511 if (fd == preverrout_fd)
5512 preverrout_fd = new_fd;
5514 return 0; /* "we did not close fd" */
5518 internally_opened_fd(int fd, struct redirtab *sq)
5525 /* If this one of script's fds? */
5527 struct parsefile *pf = g_parsefile;
5529 if (fd == pf->pf_fd)
5535 if (sq) for (i = 0; i < sq->pair_count && sq->two_fd[i].orig_fd != EMPTY; i++) {
5536 if (fd == sq->two_fd[i].moved_to)
5543 * Process a list of redirection commands. If the REDIR_PUSH flag is set,
5544 * old file descriptors are stashed away so that the redirection can be
5545 * undone by calling popredir.
5547 /* flags passed to redirect */
5548 #define REDIR_PUSH 01 /* save previous values of file descriptors */
5550 redirect(union node *redir, int flags)
5552 struct redirtab *sv;
5559 if (flags & REDIR_PUSH)
5567 fd = redir->nfile.fd;
5568 if (redir->nfile.type == NTOFD || redir->nfile.type == NFROMFD) {
5569 //bb_error_msg("doing %d > %d", fd, newfd);
5570 newfd = redir->ndup.dupfd;
5573 newfd = openredirect(redir); /* always >= 0 */
5575 /* open() gave us precisely the fd we wanted.
5576 * This means that this fd was not busy
5577 * (not opened to anywhere).
5578 * Remember to close it on restore:
5580 add_squirrel_closed(sv, fd);
5589 /* if "N>FILE": move newfd to fd */
5590 /* if "N>&M": dup newfd to fd */
5591 /* if "N>&-": close fd (newfd is -1) */
5593 IF_BASH_REDIR_OUTPUT(redirect_more:)
5595 closed = save_fd_on_redirect(fd, /*avoid:*/ newfd, sv);
5597 /* "N>&-" means "close me" */
5599 /* ^^^ optimization: saving may already
5600 * have closed it. If not... */
5604 /* if newfd is a script fd or saved fd, simulate EBADF */
5605 if (internally_opened_fd(newfd, sv)) {
5607 ash_msg_and_raise_perror("%d", newfd);
5609 dup2_or_raise(newfd, fd);
5610 if (close_fd >= 0) /* "N>FILE" or ">&FILE" or heredoc? */
5612 #if BASH_REDIR_OUTPUT
5613 if (redir->nfile.type == NTO2 && fd == 1) {
5614 /* ">&FILE". we already redirected to 1, now copy 1 to 2 */
5622 } while ((redir = redir->nfile.next) != NULL);
5625 //dash:#define REDIR_SAVEFD2 03 /* set preverrout */
5626 #define REDIR_SAVEFD2 0
5627 // dash has a bug: since REDIR_SAVEFD2=3 and REDIR_PUSH=1, this test
5628 // triggers for pure REDIR_PUSH too. Thus, this is done almost always,
5629 // not only for calls with flags containing REDIR_SAVEFD2.
5630 // We do this unconditionally (see save_fd_on_redirect()).
5631 //if ((flags & REDIR_SAVEFD2) && copied_fd2 >= 0)
5632 // preverrout_fd = copied_fd2;
5636 redirectsafe(union node *redir, int flags)
5639 volatile int saveint;
5640 struct jmploc *volatile savehandler = exception_handler;
5641 struct jmploc jmploc;
5644 /* "echo 9>/dev/null; echo >&9; echo result: $?" - result should be 1, not 2! */
5645 err = setjmp(jmploc.loc); /* was = setjmp(jmploc.loc) * 2; */
5647 exception_handler = &jmploc;
5648 redirect(redir, flags);
5650 exception_handler = savehandler;
5651 if (err && exception_type != EXERROR)
5652 longjmp(exception_handler->loc, 1);
5653 RESTORE_INT(saveint);
5657 static struct redirtab*
5658 pushredir(union node *redir)
5660 struct redirtab *sv;
5669 #if BASH_REDIR_OUTPUT
5670 if (redir->nfile.type == NTO2)
5673 redir = redir->nfile.next;
5676 sv = ckzalloc(sizeof(*sv) + i * sizeof(sv->two_fd[0]));
5679 sv->two_fd[i].orig_fd = sv->two_fd[i].moved_to = EMPTY;
5680 sv->next = redirlist;
5686 * Undo the effects of the last redirection.
5691 struct redirtab *rp;
5694 if (redirlist == NULL)
5698 for (i = 0; i < rp->pair_count; i++) {
5699 int fd = rp->two_fd[i].orig_fd;
5700 int copy = rp->two_fd[i].moved_to;
5701 if (copy == CLOSED) {
5706 if (copy != EMPTY) {
5709 dup2_or_raise(copy, fd);
5714 redirlist = rp->next;
5720 unwindredir(struct redirtab *stop)
5722 while (redirlist != stop)
5723 popredir(/*drop:*/ 0);
5727 /* ============ Routines to expand arguments to commands
5729 * We have to deal with backquotes, shell variables, and file metacharacters.
5732 #if ENABLE_FEATURE_SH_MATH
5734 ash_arith(const char *s)
5736 arith_state_t math_state;
5739 math_state.lookupvar = lookupvar;
5740 math_state.setvar = setvar0;
5741 //math_state.endofname = endofname;
5744 result = arith(&math_state, s);
5745 if (math_state.errmsg)
5746 ash_msg_and_raise_error(math_state.errmsg);
5756 #define EXP_FULL 0x1 /* perform word splitting & file globbing */
5757 #define EXP_TILDE 0x2 /* do normal tilde expansion */
5758 #define EXP_VARTILDE 0x4 /* expand tildes in an assignment */
5759 #define EXP_REDIR 0x8 /* file glob for a redirection (1 match only) */
5760 /* ^^^^^^^^^^^^^^ this is meant to support constructs such as "cmd >file*.txt"
5761 * POSIX says for this case:
5762 * Pathname expansion shall not be performed on the word by a
5763 * non-interactive shell; an interactive shell may perform it, but shall
5764 * do so only when the expansion would result in one word.
5765 * Currently, our code complies to the above rule by never globbing
5766 * redirection filenames.
5767 * Bash performs globbing, unless it is non-interactive and in POSIX mode.
5768 * (this means that on a typical Linux distro, bash almost always
5769 * performs globbing, and thus diverges from what we do).
5771 #define EXP_CASE 0x10 /* keeps quotes around for CASE pattern */
5772 #define EXP_QPAT 0x20 /* pattern in quoted parameter expansion */
5773 #define EXP_VARTILDE2 0x40 /* expand tildes after colons only */
5774 #define EXP_WORD 0x80 /* expand word in parameter expansion */
5775 #define EXP_QUOTED 0x100 /* expand word in double quotes */
5779 #define RMESCAPE_ALLOC 0x1 /* Allocate a new string */
5780 #define RMESCAPE_GLOB 0x2 /* Add backslashes for glob */
5781 #define RMESCAPE_GROW 0x8 /* Grow strings instead of stalloc */
5782 #define RMESCAPE_HEAP 0x10 /* Malloc strings instead of stalloc */
5783 #define RMESCAPE_SLASH 0x20 /* Stop globbing after slash */
5785 /* Add CTLESC when necessary. */
5786 #define QUOTES_ESC (EXP_FULL | EXP_CASE | EXP_QPAT)
5787 /* Do not skip NUL characters. */
5788 #define QUOTES_KEEPNUL EXP_TILDE
5791 * Structure specifying which parts of the string should be searched
5792 * for IFS characters.
5795 struct ifsregion *next; /* next region in list */
5796 int begoff; /* offset of start of region */
5797 int endoff; /* offset of end of region */
5798 int nulonly; /* search for nul bytes only */
5802 struct strlist *list;
5803 struct strlist **lastp;
5806 /* output of current string */
5807 static char *expdest;
5808 /* list of back quote expressions */
5809 static struct nodelist *argbackq;
5810 /* first struct in list of ifs regions */
5811 static struct ifsregion ifsfirst;
5812 /* last struct in list */
5813 static struct ifsregion *ifslastp;
5814 /* holds expanded arg list */
5815 static struct arglist exparg;
5819 * cvtnum() is used even if math support is off (to prepare $? values and such).
5826 /* 32-bit and wider ints require buffer size of bytes*3 (or less) */
5827 len = sizeof(arith_t) * 3;
5828 /* If narrower: worst case, 1-byte ints: need 5 bytes: "-127<NUL>" */
5829 if (sizeof(arith_t) < 4) len += 2;
5831 expdest = makestrspace(len, expdest);
5832 len = fmtstr(expdest, len, ARITH_FMT, num);
5833 STADJUST(len, expdest);
5838 * Break the argument string into pieces based upon IFS and add the
5839 * strings to the argument list. The regions of the string to be
5840 * searched for IFS characters have been stored by recordregion.
5843 ifsbreakup(char *string, struct arglist *arglist)
5845 struct ifsregion *ifsp;
5850 const char *ifs, *realifs;
5855 if (ifslastp != NULL) {
5858 realifs = ifsset() ? ifsval() : defifs;
5861 p = string + ifsp->begoff;
5862 nulonly = ifsp->nulonly;
5863 ifs = nulonly ? nullstr : realifs;
5865 while (p < string + ifsp->endoff) {
5867 if ((unsigned char)*p == CTLESC)
5869 if (!strchr(ifs, *p)) {
5874 ifsspc = (strchr(defifs, *p) != NULL);
5875 /* Ignore IFS whitespace at start */
5876 if (q == start && ifsspc) {
5882 sp = stzalloc(sizeof(*sp));
5884 *arglist->lastp = sp;
5885 arglist->lastp = &sp->next;
5889 if (p >= string + ifsp->endoff) {
5893 if ((unsigned char)*p == CTLESC)
5895 if (strchr(ifs, *p) == NULL) {
5899 if (strchr(defifs, *p) == NULL) {
5914 } while (ifsp != NULL);
5923 sp = stzalloc(sizeof(*sp));
5925 *arglist->lastp = sp;
5926 arglist->lastp = &sp->next;
5932 struct ifsregion *p = ifsfirst.next;
5939 struct ifsregion *ifsp;
5944 ifsfirst.next = NULL;
5951 esclen(const char *start, const char *p)
5955 while (p > start && (unsigned char)*--p == CTLESC) {
5962 * Remove any CTLESC characters from a string.
5965 rmescapes(char *str, int flag)
5967 static const char qchars[] ALIGN1 = {
5968 IF_BASH_PATTERN_SUBST('/',) CTLESC, CTLQUOTEMARK, '\0' };
5972 unsigned protect_against_glob;
5974 IF_BASH_PATTERN_SUBST(unsigned slash = flag & RMESCAPE_SLASH;)
5976 p = strpbrk(str, qchars IF_BASH_PATTERN_SUBST(+ !slash));
5982 if (flag & RMESCAPE_ALLOC) {
5983 size_t len = p - str;
5984 size_t fulllen = len + strlen(p) + 1;
5986 if (flag & RMESCAPE_GROW) {
5987 int strloc = str - (char *)stackblock();
5988 r = makestrspace(fulllen, expdest);
5989 /* p and str may be invalidated by makestrspace */
5990 str = (char *)stackblock() + strloc;
5992 } else if (flag & RMESCAPE_HEAP) {
5993 r = ckmalloc(fulllen);
5995 r = stalloc(fulllen);
5999 q = (char *)mempcpy(q, str, len);
6004 globbing = flag & RMESCAPE_GLOB;
6005 protect_against_glob = globbing;
6007 if ((unsigned char)*p == CTLQUOTEMARK) {
6008 // Note: both inquotes and protect_against_glob only affect whether
6009 // CTLESC,<ch> gets converted to <ch> or to \<ch>
6010 inquotes = ~inquotes;
6012 protect_against_glob = globbing;
6015 if ((unsigned char)*p == CTLESC) {
6019 ash_msg_and_raise_error("CTLESC at EOL (shouldn't happen)");
6021 if (protect_against_glob) {
6023 * We used to trust glob() and fnmatch() to eat
6024 * superfluous escapes (\z where z has no
6025 * special meaning anyway). But this causes
6026 * bugs such as string of one greek letter rho
6027 * (unicode-encoded as two bytes "cf,81")
6028 * getting encoded as "cf,CTLESC,81"
6029 * and here, converted to "cf,\,81" -
6030 * which does not go well with some flavors
6031 * of fnmatch() in unicode locales
6032 * (for example, glibc <= 2.22).
6034 * Lets add "\" only on the chars which need it.
6035 * Testcases for less obvious chars are shown.
6040 || *p == '\\' /* case '\' in \\ ) echo ok;; *) echo WRONG;; esac */
6041 || *p == ']' /* case ']' in [a\]] ) echo ok;; *) echo WRONG;; esac */
6042 || *p == '-' /* case '-' in [a\-c]) echo ok;; *) echo WRONG;; esac */
6043 || *p == '!' /* case '!' in [\!] ) echo ok;; *) echo WRONG;; esac */
6044 /* Some libc support [^negate], that's why "^" also needs love */
6045 || *p == '^' /* case '^' in [\^] ) echo ok;; *) echo WRONG;; esac */
6050 } else if (*p == '\\' && !inquotes) {
6051 /* naked back slash */
6052 protect_against_glob = 0;
6055 #if BASH_PATTERN_SUBST
6056 else if (*p == '/' && slash) {
6057 /* stop handling globbing and mark location of slash */
6058 globbing = slash = 0;
6062 protect_against_glob = globbing;
6067 if (flag & RMESCAPE_GROW) {
6069 STADJUST(q - r + 1, expdest);
6073 #define pmatch(a, b) !fnmatch((a), (b), 0)
6076 * Prepare a pattern for a expmeta (internal glob(3)) call.
6078 * Returns an stalloced string.
6081 preglob(const char *pattern, int flag)
6083 return rmescapes((char *)pattern, flag | RMESCAPE_GLOB);
6087 * Put a string on the stack.
6090 memtodest(const char *p, size_t len, int syntax, int quotes)
6097 q = makestrspace((quotes & QUOTES_ESC) ? len * 2 : len, expdest);
6100 unsigned char c = *p++;
6102 if (quotes & QUOTES_ESC) {
6103 int n = SIT(c, syntax);
6105 || (((quotes & EXP_FULL) || syntax != BASESYNTAX)
6112 } else if (!(quotes & QUOTES_KEEPNUL))
6121 strtodest(const char *p, int syntax, int quotes)
6123 size_t len = strlen(p);
6124 memtodest(p, len, syntax, quotes);
6129 * Record the fact that we have to scan this region of the
6130 * string for IFS characters.
6133 recordregion(int start, int end, int nulonly)
6135 struct ifsregion *ifsp;
6137 if (ifslastp == NULL) {
6141 ifsp = ckzalloc(sizeof(*ifsp));
6142 /*ifsp->next = NULL; - ckzalloc did it */
6143 ifslastp->next = ifsp;
6147 ifslastp->begoff = start;
6148 ifslastp->endoff = end;
6149 ifslastp->nulonly = nulonly;
6153 removerecordregions(int endoff)
6155 if (ifslastp == NULL)
6158 if (ifsfirst.endoff > endoff) {
6159 while (ifsfirst.next) {
6160 struct ifsregion *ifsp;
6162 ifsp = ifsfirst.next->next;
6163 free(ifsfirst.next);
6164 ifsfirst.next = ifsp;
6167 if (ifsfirst.begoff > endoff) {
6170 ifslastp = &ifsfirst;
6171 ifsfirst.endoff = endoff;
6176 ifslastp = &ifsfirst;
6177 while (ifslastp->next && ifslastp->next->begoff < endoff)
6178 ifslastp = ifslastp->next;
6179 while (ifslastp->next) {
6180 struct ifsregion *ifsp;
6182 ifsp = ifslastp->next->next;
6183 free(ifslastp->next);
6184 ifslastp->next = ifsp;
6187 if (ifslastp->endoff > endoff)
6188 ifslastp->endoff = endoff;
6192 exptilde(char *startp, char *p, int flags)
6198 int quotes = flags & QUOTES_ESC;
6202 while ((c = *++p) != '\0') {
6209 if (flags & EXP_VARTILDE)
6219 if (*name == '\0') {
6220 home = lookupvar("HOME");
6222 pw = getpwnam(name);
6227 if (!home || !*home)
6230 strtodest(home, SQSYNTAX, quotes);
6238 * Execute a command inside back quotes. If it's a builtin command, we
6239 * want to save its output in a block obtained from malloc. Otherwise
6240 * we fork off a subprocess and get the output of the command via a pipe.
6241 * Should be called with interrupts off.
6243 struct backcmd { /* result of evalbackcmd */
6244 int fd; /* file descriptor to read from */
6245 int nleft; /* number of chars in buffer */
6246 char *buf; /* buffer */
6247 struct job *jp; /* job structure for command */
6250 /* These forward decls are needed to use "eval" code for backticks handling: */
6251 /* flags in argument to evaltree */
6252 #define EV_EXIT 01 /* exit after evaluating tree */
6253 #define EV_TESTED 02 /* exit status is checked; ignore -e flag */
6254 static int evaltree(union node *, int);
6256 /* An evaltree() which is known to never return.
6257 * Used to use an alias:
6258 * static int evaltreenr(union node *, int) __attribute__((alias("evaltree"),__noreturn__));
6259 * but clang was reported to "transfer" noreturn-ness to evaltree() as well.
6261 static ALWAYS_INLINE NORETURN void
6262 evaltreenr(union node *n, int flags)
6265 bb_unreachable(abort());
6269 static void FAST_FUNC
6270 evalbackcmd(union node *n, struct backcmd *result)
6284 ash_msg_and_raise_perror("can't create pipe");
6285 jp = makejob(/*n,*/ 1);
6286 if (forkshell(jp, n, FORK_NOJOB) == 0) {
6292 dup2_or_raise(pip[1], 1);
6295 /* TODO: eflag clearing makes the following not abort:
6296 * ash -c 'set -e; z=$(false;echo foo); echo $z'
6297 * which is what bash does (unless it is in POSIX mode).
6298 * dash deleted "eflag = 0" line in the commit
6299 * Date: Mon, 28 Jun 2010 17:11:58 +1000
6300 * [EVAL] Don't clear eflag in evalbackcmd
6301 * For now, preserve bash-like behavior, it seems to be somewhat more useful:
6305 evaltreenr(n, EV_EXIT);
6310 result->fd = pip[0];
6314 TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n",
6315 result->fd, result->buf, result->nleft, result->jp));
6319 * Expand stuff in backwards quotes.
6322 expbackq(union node *cmd, int flag)
6330 int syntax = flag & EXP_QUOTED ? DQSYNTAX : BASESYNTAX;
6331 struct stackmark smark;
6334 startloc = expdest - (char *)stackblock();
6335 pushstackmark(&smark, startloc);
6336 evalbackcmd(cmd, &in);
6337 popstackmark(&smark);
6344 memtodest(p, i, syntax, flag & QUOTES_ESC);
6348 i = nonblock_immune_read(in.fd, buf, sizeof(buf));
6349 TRACE(("expbackq: read returns %d\n", i));
6358 back_exitstatus = waitforjob(in.jp);
6362 /* Eat all trailing newlines */
6364 for (; dest > (char *)stackblock() && dest[-1] == '\n';)
6368 if (!(flag & EXP_QUOTED))
6369 recordregion(startloc, dest - (char *)stackblock(), 0);
6370 TRACE(("evalbackq: size:%d:'%.*s'\n",
6371 (int)((dest - (char *)stackblock()) - startloc),
6372 (int)((dest - (char *)stackblock()) - startloc),
6373 stackblock() + startloc));
6376 #if ENABLE_FEATURE_SH_MATH
6378 * Expand arithmetic expression. Backup to start of expression,
6379 * evaluate, place result in (backed up) result, adjust string position.
6391 * This routine is slightly over-complicated for
6392 * efficiency. Next we scan backwards looking for the
6393 * start of arithmetic.
6395 start = stackblock();
6402 while ((unsigned char)*p != CTLARI) {
6406 ash_msg_and_raise_error("missing CTLARI (shouldn't happen)");
6411 esc = esclen(start, p);
6421 removerecordregions(begoff);
6425 if (flag & QUOTES_ESC)
6426 rmescapes(p + 1, 0);
6428 len = cvtnum(ash_arith(p + 1));
6430 if (!(flag & EXP_QUOTED))
6431 recordregion(begoff, begoff + len, 0);
6435 /* argstr needs it */
6436 static char *evalvar(char *p, int flags);
6439 * Perform variable and command substitution. If EXP_FULL is set, output CTLESC
6440 * characters to allow for further processing. Otherwise treat
6441 * $@ like $* since no splitting will be performed.
6444 argstr(char *p, int flags)
6446 static const char spclchars[] ALIGN1 = {
6454 #if ENABLE_FEATURE_SH_MATH
6459 const char *reject = spclchars;
6460 int breakall = (flags & (EXP_WORD | EXP_QUOTED)) == EXP_WORD;
6465 if (!(flags & EXP_VARTILDE)) {
6467 } else if (flags & EXP_VARTILDE2) {
6472 if (flags & EXP_TILDE) {
6475 flags &= ~EXP_TILDE;
6479 p = exptilde(p, q, flags);
6482 startloc = expdest - (char *)stackblock();
6486 length += strcspn(p + length, reject);
6490 IF_FEATURE_SH_MATH(|| c == CTLENDARI)
6492 /* c == '=' || c == ':' || c == CTLENDARI */
6498 expdest = stack_nputstr(p, length, expdest);
6499 newloc = expdest - (char *)stackblock();
6500 if (breakall && !inquotes && newloc > startloc) {
6501 recordregion(startloc, newloc, 0);
6512 if (flags & EXP_VARTILDE2) {
6516 flags |= EXP_VARTILDE2;
6521 * sort of a hack - expand tildes in variable
6522 * assignments (after the first '=' and after ':'s).
6531 case CTLENDVAR: /* ??? */
6534 inquotes ^= EXP_QUOTED;
6535 /* "$@" syntax adherence hack */
6536 if (inquotes && !memcmp(p, dolatstr + 1, DOLATSTRLEN - 1)) {
6537 p = evalvar(p + 1, flags | inquotes) + 1;
6541 if (flags & QUOTES_ESC) {
6552 * Quoted parameter expansion pattern: remove quote
6553 * unless inside inner quotes or we have a literal
6556 if (((flags | inquotes) & (EXP_QPAT | EXP_QUOTED)) ==
6557 EXP_QPAT && *p != '\\')
6562 TRACE(("argstr: evalvar('%s')\n", p));
6563 p = evalvar(p, flags | inquotes);
6564 TRACE(("argstr: evalvar:'%s'\n", (char *)stackblock()));
6567 expbackq(argbackq->n, flags | inquotes);
6568 argbackq = argbackq->next;
6570 #if ENABLE_FEATURE_SH_MATH
6573 expari(flags | inquotes);
6582 scanleft(char *startp, char *rmesc, char *rmescend UNUSED_PARAM,
6583 char *pattern, int quotes, int zero)
6592 const char *s = loc2;
6599 match = pmatch(pattern, s);
6604 if (quotes && (unsigned char)*loc == CTLESC)
6613 scanright(char *startp, char *rmesc, char *rmescend,
6614 char *pattern, int quotes, int match_at_start)
6616 #if !ENABLE_ASH_OPTIMIZE_FOR_SIZE
6617 int try2optimize = match_at_start;
6623 /* If we called by "${v/pattern/repl}" or "${v//pattern/repl}":
6624 * startp="escaped_value_of_v" rmesc="raw_value_of_v"
6625 * rmescend=""(ptr to NUL in rmesc) pattern="pattern" quotes=match_at_start=1
6627 * loc starts at NUL at the end of startp, loc2 starts at the end of rmesc,
6628 * and on each iteration they go back two/one char until they reach the beginning.
6629 * We try to find a match in "raw_value_of_v", "raw_value_of_", "raw_value_of" etc.
6631 /* TODO: document in what other circumstances we are called. */
6633 for (loc = pattern - 1, loc2 = rmescend; loc >= startp; loc2--) {
6636 const char *s = loc2;
6637 if (match_at_start) {
6641 match = pmatch(pattern, s);
6642 //bb_error_msg("pmatch(pattern:'%s',s:'%s'):%d", pattern, s, match);
6646 #if !ENABLE_ASH_OPTIMIZE_FOR_SIZE
6648 /* Maybe we can optimize this:
6649 * if pattern ends with unescaped *, we can avoid checking
6650 * shorter strings: if "foo*" doesn't match "raw_value_of_v",
6651 * it won't match truncated "raw_value_of_" strings too.
6653 unsigned plen = strlen(pattern);
6654 /* Does it end with "*"? */
6655 if (plen != 0 && pattern[--plen] == '*') {
6656 /* "xxxx*" is not escaped */
6657 /* "xxx\*" is escaped */
6658 /* "xx\\*" is not escaped */
6659 /* "x\\\*" is escaped */
6661 while (plen != 0 && pattern[--plen] == '\\')
6664 break; /* ends with unescaped "*" */
6672 esc = esclen(startp, loc);
6683 static void varunset(const char *, const char *, const char *, int) NORETURN;
6685 varunset(const char *end, const char *var, const char *umsg, int varflags)
6691 msg = "parameter not set";
6693 if ((unsigned char)*end == CTLENDVAR) {
6694 if (varflags & VSNUL)
6700 ash_msg_and_raise_error("%.*s: %s%s", (int)(end - var - 1), var, msg, tail);
6704 subevalvar(char *p, char *varname, int strloc, int subtype,
6705 int startloc, int varflags, int flag)
6707 struct nodelist *saveargbackq = argbackq;
6708 int quotes = flag & QUOTES_ESC;
6711 char *rmesc, *rmescend;
6713 int amount, resetloc;
6714 IF_BASH_PATTERN_SUBST(int workloc;)
6715 IF_BASH_PATTERN_SUBST(char *repl = NULL;)
6717 char *(*scan)(char*, char*, char*, char*, int, int);
6719 //bb_error_msg("subevalvar(p:'%s',varname:'%s',strloc:%d,subtype:%d,startloc:%d,varflags:%x,quotes:%d)",
6720 // p, varname, strloc, subtype, startloc, varflags, quotes);
6722 argstr(p, EXP_TILDE | (subtype != VSASSIGN && subtype != VSQUESTION ?
6723 (flag & (EXP_QUOTED | EXP_QPAT) ? EXP_QPAT : EXP_CASE) : 0)
6725 STPUTC('\0', expdest);
6726 argbackq = saveargbackq;
6727 startp = (char *)stackblock() + startloc;
6731 setvar0(varname, startp);
6732 amount = startp - expdest;
6733 STADJUST(amount, expdest);
6737 varunset(p, varname, startp, varflags);
6742 int pos, len, orig_len;
6745 loc = str = stackblock() + strloc;
6747 # if !ENABLE_FEATURE_SH_MATH
6748 # define ash_arith number
6750 /* Read POS in ${var:POS:LEN} */
6751 colon = strchr(loc, ':');
6752 if (colon) *colon = '\0';
6753 pos = ash_arith(loc);
6754 if (colon) *colon = ':';
6756 /* Read LEN in ${var:POS:LEN} */
6757 len = str - startp - 1;
6758 /* *loc != '\0', guaranteed by parser */
6762 /* Adjust the length by the number of escapes */
6763 for (ptr = startp; ptr < (str - 1); ptr++) {
6764 if ((unsigned char)*ptr == CTLESC) {
6771 if (*loc++ == ':') {
6773 len = ash_arith(loc);
6775 /* Skip POS in ${var:POS:LEN} */
6777 while (*loc && *loc != ':') {
6780 if (*loc++ == ':') {
6781 len = ash_arith(loc);
6787 /* ${VAR:$((-n)):l} starts n chars from the end */
6788 pos = orig_len + pos;
6790 if ((unsigned)pos >= orig_len) {
6791 /* apart from obvious ${VAR:999999:l},
6792 * covers ${VAR:$((-9999999)):l} - result is ""
6799 /* ${VAR:N:-M} sets LEN to strlen()-M */
6800 len = (orig_len - pos) + len;
6802 if ((unsigned)len > (orig_len - pos))
6803 len = orig_len - pos;
6805 for (str = startp; pos; str++, pos--) {
6806 if (quotes && (unsigned char)*str == CTLESC)
6809 for (loc = startp; len; len--) {
6810 if (quotes && (unsigned char)*str == CTLESC)
6815 amount = loc - expdest;
6816 STADJUST(amount, expdest);
6819 #endif /* BASH_SUBSTR */
6822 resetloc = expdest - (char *)stackblock();
6824 #if BASH_PATTERN_SUBST
6825 /* We'll comeback here if we grow the stack while handling
6826 * a VSREPLACE or VSREPLACEALL, since our pointers into the
6827 * stack will need rebasing, and we'll need to remove our work
6833 amount = expdest - ((char *)stackblock() + resetloc);
6834 STADJUST(-amount, expdest);
6835 startp = (char *)stackblock() + startloc;
6838 rmescend = (char *)stackblock() + strloc;
6840 rmesc = rmescapes(startp, RMESCAPE_ALLOC | RMESCAPE_GROW);
6841 if (rmesc != startp) {
6843 startp = (char *)stackblock() + startloc;
6847 str = (char *)stackblock() + strloc;
6849 * Example: v='a\bc'; echo ${v/\\b/_\\_\z_}
6850 * The result is a_\_z_c (not a\_\_z_c)!
6852 * The search pattern and replace string treat backslashes differently!
6853 * RMESCAPE_SLASH causes preglob to work differently on the pattern
6854 * and string. It's only used on the first call.
6856 preglob(str, IF_BASH_PATTERN_SUBST(
6857 (subtype == VSREPLACE || subtype == VSREPLACEALL) && !repl ?
6858 RMESCAPE_SLASH : ) 0);
6860 #if BASH_PATTERN_SUBST
6861 workloc = expdest - (char *)stackblock();
6862 if (subtype == VSREPLACE || subtype == VSREPLACEALL) {
6867 repl = strchr(str, CTLESC);
6873 //bb_error_msg("str:'%s' repl:'%s'", str, repl);
6875 /* If there's no pattern to match, return the expansion unmolested */
6884 loc = scanright(idx, rmesc, rmescend, str, quotes, 1);
6885 //bb_error_msg("scanright('%s'):'%s'", str, loc);
6887 /* No match, advance */
6888 char *restart_detect = stackblock();
6890 STPUTC(*idx, expdest);
6891 if (quotes && (unsigned char)*idx == CTLESC) {
6894 STPUTC(*idx, expdest);
6896 if (stackblock() != restart_detect)
6901 /* continue; - prone to quadratic behavior, smarter code: */
6904 if (str[0] == '*') {
6905 /* Pattern is "*foo". If "*foo" does not match "long_string",
6906 * it would never match "ong_string" etc, no point in trying.
6913 if (subtype == VSREPLACEALL) {
6915 if (quotes && (unsigned char)*idx == CTLESC)
6924 //bb_error_msg("repl:'%s'", repl);
6925 for (loc = (char*)repl; *loc; loc++) {
6926 char *restart_detect = stackblock();
6927 if (quotes && *loc == '\\') {
6928 STPUTC(CTLESC, expdest);
6931 STPUTC(*loc, expdest);
6932 if (stackblock() != restart_detect)
6937 if (subtype == VSREPLACE) {
6938 //bb_error_msg("tail:'%s', quotes:%x", idx, quotes);
6940 char *restart_detect = stackblock();
6941 STPUTC(*idx, expdest);
6942 if (stackblock() != restart_detect)
6951 /* We've put the replaced text into a buffer at workloc, now
6952 * move it to the right place and adjust the stack.
6954 STPUTC('\0', expdest);
6955 startp = (char *)stackblock() + startloc;
6956 memmove(startp, (char *)stackblock() + workloc, len + 1);
6957 //bb_error_msg("startp:'%s'", startp);
6958 amount = expdest - (startp + len);
6959 STADJUST(-amount, expdest);
6962 #endif /* BASH_PATTERN_SUBST */
6964 subtype -= VSTRIMRIGHT;
6966 if (subtype < 0 || subtype > 7)
6969 /* zero = (subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX) */
6970 zero = subtype >> 1;
6971 /* VSTRIMLEFT/VSTRIMRIGHTMAX -> scanleft */
6972 scan = (subtype & 1) ^ zero ? scanleft : scanright;
6974 loc = scan(startp, rmesc, rmescend, str, quotes, zero);
6977 memmove(startp, loc, str - loc);
6978 loc = startp + (str - loc) - 1;
6981 amount = loc - expdest;
6982 STADJUST(amount, expdest);
6988 * Add the value of a specialized variable to the stack string.
6989 * name parameter (examples):
6990 * ash -c 'echo $1' name:'1='
6991 * ash -c 'echo $qwe' name:'qwe='
6992 * ash -c 'echo $$' name:'$='
6993 * ash -c 'echo ${$}' name:'$='
6994 * ash -c 'echo ${$##q}' name:'$=q'
6995 * ash -c 'echo ${#$}' name:'$='
6996 * note: examples with bad shell syntax:
6997 * ash -c 'echo ${#$1}' name:'$=1'
6998 * ash -c 'echo ${#1#}' name:'1=#'
7000 static NOINLINE ssize_t
7001 varvalue(char *name, int varflags, int flags, int *quotedp)
7008 int quoted = *quotedp;
7009 int subtype = varflags & VSTYPE;
7010 int discard = subtype == VSPLUS || subtype == VSLENGTH;
7011 int quotes = (discard ? 0 : (flags & QUOTES_ESC)) | QUOTES_KEEPNUL;
7014 sep = (flags & EXP_FULL) << CHAR_BIT;
7015 syntax = quoted ? DQSYNTAX : BASESYNTAX;
7025 num = shellparam.nparam;
7033 goto check_1char_name;
7035 expdest = makestrspace(NOPTS, expdest);
7036 for (i = NOPTS - 1; i >= 0; i--) {
7038 USTPUTC(optletters(i), expdest);
7044 /* handles cases similar to ${#$1} */
7045 if (name[2] != '\0')
7046 raise_error_syntax("bad substitution");
7059 sep |= ifsset() ? ifsval()[0] : ' ';
7066 while ((p = *ap++) != NULL) {
7067 len += strtodest(p, syntax, quotes);
7071 memtodest(&sepc, 1, syntax, quotes);
7086 num = atoi(name); /* number(name) fails on ${N#str} etc */
7087 if (num < 0 || num > shellparam.nparam)
7089 p = num ? shellparam.p[num - 1] : arg0;
7092 /* NB: name has form "VAR=..." */
7093 p = lookupvar(name);
7098 len = strtodest(p, syntax, quotes);
7099 #if ENABLE_UNICODE_SUPPORT
7100 if (subtype == VSLENGTH && len > 0) {
7101 reinit_unicode_for_ash();
7102 if (unicode_status == UNICODE_ON) {
7103 STADJUST(-len, expdest);
7105 len = unicode_strlen(p);
7113 STADJUST(-len, expdest);
7118 * Expand a variable, and return a pointer to the next character in the
7122 evalvar(char *p, int flag)
7133 varflags = (unsigned char) *p++;
7134 subtype = varflags & VSTYPE;
7137 raise_error_syntax("bad substitution");
7139 quoted = flag & EXP_QUOTED;
7141 easy = (!quoted || (*var == '@' && shellparam.nparam));
7142 startloc = expdest - (char *)stackblock();
7143 p = strchr(p, '=') + 1; //TODO: use var_end(p)?
7146 varlen = varvalue(var, varflags, flag, "ed);
7147 if (varflags & VSNUL)
7150 if (subtype == VSPLUS) {
7151 varlen = -1 - varlen;
7155 if (subtype == VSMINUS) {
7160 flag | EXP_TILDE | EXP_WORD
7167 if (subtype == VSASSIGN || subtype == VSQUESTION) {
7171 subevalvar(p, var, 0, subtype, startloc, varflags,
7172 flag & ~QUOTES_ESC);
7175 * Remove any recorded regions beyond
7178 removerecordregions(startloc);
7182 if (varlen < 0 && uflag)
7183 varunset(p, var, 0, 0);
7185 if (subtype == VSLENGTH) {
7186 cvtnum(varlen > 0 ? varlen : 0);
7190 if (subtype == VSNORMAL) {
7194 recordregion(startloc, expdest - (char *)stackblock(), quoted);
7203 case VSTRIMRIGHTMAX:
7207 #if BASH_PATTERN_SUBST
7219 * Terminate the string and start recording the pattern
7222 STPUTC('\0', expdest);
7223 patloc = expdest - (char *)stackblock();
7224 if (NULL == subevalvar(p, /* varname: */ NULL, patloc, subtype,
7225 startloc, varflags, flag)) {
7226 int amount = expdest - (
7227 (char *)stackblock() + patloc - 1
7229 STADJUST(-amount, expdest);
7231 /* Remove any recorded regions beyond start of variable */
7232 removerecordregions(startloc);
7237 if (subtype != VSNORMAL) { /* skip to end of alternative */
7240 unsigned char c = *p++;
7243 else if (c == CTLBACKQ) {
7245 argbackq = argbackq->next;
7246 } else if (c == CTLVAR) {
7247 if ((*p++ & VSTYPE) != VSNORMAL)
7249 } else if (c == CTLENDVAR) {
7259 * Add a file name to the list.
7262 addfname(const char *name)
7266 sp = stzalloc(sizeof(*sp));
7267 sp->text = sstrdup(name);
7269 exparg.lastp = &sp->next;
7272 /* Avoid glob() (and thus, stat() et al) for words like "echo" */
7274 hasmeta(const char *p)
7276 static const char chars[] ALIGN1 = {
7277 '*', '?', '[', '\\', CTLQUOTEMARK, CTLESC, 0
7281 p = strpbrk(p, chars);
7284 switch ((unsigned char) *p) {
7288 if (*p == CTLQUOTEMARK)
7292 if (*p == '\0') /* huh? */
7303 if (!strchr(p + 1, ']')) {
7304 /* It's not a properly closed [] pattern,
7305 * but other metas may follow. Continue checking.
7306 * my[file* _is_ globbed by bash
7307 * and matches filenames like "my[file1".
7323 /* If we want to use glob() from libc... */
7324 #if !ENABLE_ASH_INTERNAL_GLOB
7326 /* Add the result of glob() to the list */
7328 addglob(const glob_t *pglob)
7330 char **p = pglob->gl_pathv;
7337 expandmeta(struct strlist *str /*, int flag*/)
7339 /* TODO - EXP_REDIR */
7349 if (!hasmeta(str->text))
7353 p = preglob(str->text, RMESCAPE_ALLOC | RMESCAPE_HEAP);
7354 // GLOB_NOMAGIC (GNU): if no *?[ chars in pattern, return it even if no match
7355 // GLOB_NOCHECK: if no match, return unchanged pattern (sans \* escapes?)
7357 // glibc 2.24.90 glob(GLOB_NOMAGIC) does not remove backslashes used for escaping:
7358 // if you pass it "file\?", it returns "file\?", not "file?", if no match.
7359 // Which means you need to unescape the string, right? Not so fast:
7360 // if there _is_ a file named "file\?" (with backslash), it is returned
7361 // as "file\?" too (whichever pattern you used to find it, say, "file*").
7362 // You DON'T KNOW by looking at the result whether you need to unescape it.
7364 // Worse, globbing of "file\?" in a directory with two files, "file?" and "file\?",
7365 // returns "file\?" - which is WRONG: "file\?" pattern matches "file?" file.
7366 // Without GLOB_NOMAGIC, this works correctly ("file?" is returned as a match).
7367 // With GLOB_NOMAGIC | GLOB_NOCHECK, this also works correctly.
7368 // i = glob(p, GLOB_NOMAGIC | GLOB_NOCHECK, NULL, &pglob);
7369 // i = glob(p, GLOB_NOMAGIC, NULL, &pglob);
7370 i = glob(p, 0, NULL, &pglob);
7371 //bb_error_msg("glob('%s'):%d '%s'...", p, i, pglob.gl_pathv ? pglob.gl_pathv[0] : "-");
7376 #if 0 // glibc 2.24.90 bug? Patterns like "*/file", when match, don't set GLOB_MAGCHAR
7377 /* GLOB_MAGCHAR is set if *?[ chars were seen (GNU) */
7378 if (!(pglob.gl_flags & GLOB_MAGCHAR))
7390 *exparg.lastp = str;
7391 rmescapes(str->text, 0);
7392 exparg.lastp = &str->next;
7394 default: /* GLOB_NOSPACE */
7397 ash_msg_and_raise_error(bb_msg_memory_exhausted);
7404 /* ENABLE_ASH_INTERNAL_GLOB: Homegrown globbing code. (dash also has both, uses homegrown one.) */
7407 * Do metacharacter (i.e. *, ?, [...]) expansion.
7410 expmeta(char *expdir, char *enddir, char *name)
7426 for (p = name; esc = 0, *p; p += esc + 1) {
7427 if (*p == '*' || *p == '?')
7429 else if (*p == '[') {
7436 if (*q == '/' || *q == '\0')
7446 if (p[esc] == '/') {
7449 start = p + esc + 1;
7453 if (metaflag == 0) { /* we've reached the end of the file name */
7454 if (enddir != expdir)
7462 if (metaflag == 0 || lstat(expdir, &statb) >= 0)
7473 } while (p < start);
7475 if (enddir == expdir) {
7477 } else if (enddir == expdir + 1 && *expdir == '/') {
7486 if (enddir != expdir)
7488 if (*endname == 0) {
7501 while (!pending_int && (dp = readdir(dirp)) != NULL) {
7502 if (dp->d_name[0] == '.' && !matchdot)
7504 if (pmatch(start, dp->d_name)) {
7506 strcpy(enddir, dp->d_name);
7509 for (p = enddir, cp = dp->d_name; (*p++ = *cp++) != '\0';)
7512 expmeta(expdir, p, endname);
7518 endname[-esc - 1] = esc ? '\\' : '/';
7521 static struct strlist *
7522 msort(struct strlist *list, int len)
7524 struct strlist *p, *q = NULL;
7525 struct strlist **lpp;
7533 for (n = half; --n >= 0;) {
7537 q->next = NULL; /* terminate first half of list */
7538 q = msort(list, half); /* sort first half of list */
7539 p = msort(p, len - half); /* sort second half */
7542 #if ENABLE_LOCALE_SUPPORT
7543 if (strcoll(p->text, q->text) < 0)
7545 if (strcmp(p->text, q->text) < 0)
7569 * Sort the results of file name expansion. It calculates the number of
7570 * strings to sort and then calls msort (short for merge sort) to do the
7573 static struct strlist *
7574 expsort(struct strlist *str)
7580 for (sp = str; sp; sp = sp->next)
7582 return msort(str, len);
7586 expandmeta(struct strlist *str /*, int flag*/)
7588 /* TODO - EXP_REDIR */
7592 struct strlist **savelastp;
7598 if (!hasmeta(str->text))
7600 savelastp = exparg.lastp;
7603 p = preglob(str->text, RMESCAPE_ALLOC | RMESCAPE_HEAP);
7605 int i = strlen(str->text);
7606 //BUGGY estimation of how long expanded name can be
7607 expdir = ckmalloc(i < 2048 ? 2048 : i+1);
7609 expmeta(expdir, expdir, p);
7614 if (exparg.lastp == savelastp) {
7619 *exparg.lastp = str;
7620 rmescapes(str->text, 0);
7621 exparg.lastp = &str->next;
7623 *exparg.lastp = NULL;
7624 *savelastp = sp = expsort(*savelastp);
7625 while (sp->next != NULL)
7627 exparg.lastp = &sp->next;
7632 #endif /* ENABLE_ASH_INTERNAL_GLOB */
7635 * Perform variable substitution and command substitution on an argument,
7636 * placing the resulting list of arguments in arglist. If EXP_FULL is true,
7637 * perform splitting and file name expansion. When arglist is NULL, perform
7638 * here document expansion.
7641 expandarg(union node *arg, struct arglist *arglist, int flag)
7646 argbackq = arg->narg.backquote;
7647 STARTSTACKSTR(expdest);
7648 TRACE(("expandarg: argstr('%s',flags:%x)\n", arg->narg.text, flag));
7649 argstr(arg->narg.text, flag);
7650 p = _STPUTC('\0', expdest);
7652 if (arglist == NULL) {
7653 /* here document expanded */
7656 p = grabstackstr(p);
7657 TRACE(("expandarg: p:'%s'\n", p));
7658 exparg.lastp = &exparg.list;
7662 if (flag & EXP_FULL) {
7663 ifsbreakup(p, &exparg);
7664 *exparg.lastp = NULL;
7665 exparg.lastp = &exparg.list;
7666 expandmeta(exparg.list /*, flag*/);
7668 sp = stzalloc(sizeof(*sp));
7671 exparg.lastp = &sp->next;
7673 *exparg.lastp = NULL;
7675 *arglist->lastp = exparg.list;
7676 arglist->lastp = exparg.lastp;
7684 * Expand shell variables and backquotes inside a here document.
7687 expandhere(union node *arg, int fd)
7689 expandarg(arg, (struct arglist *)NULL, EXP_QUOTED);
7690 full_write(fd, stackblock(), expdest - (char *)stackblock());
7694 * Returns true if the pattern matches the string.
7697 patmatch(char *pattern, const char *string)
7699 char *p = preglob(pattern, 0);
7700 int r = pmatch(p, string);
7701 //bb_error_msg("!fnmatch(pattern:'%s',str:'%s',0):%d", p, string, r);
7706 * See if a pattern matches in a case statement.
7709 casematch(union node *pattern, char *val)
7711 struct stackmark smark;
7714 setstackmark(&smark);
7715 argbackq = pattern->narg.backquote;
7716 STARTSTACKSTR(expdest);
7717 argstr(pattern->narg.text, EXP_TILDE | EXP_CASE);
7718 STACKSTRNUL(expdest);
7720 result = patmatch(stackblock(), val);
7721 popstackmark(&smark);
7726 /* ============ find_command */
7730 int (*builtin)(int, char **) FAST_FUNC;
7731 /* unsigned flags; */
7733 #define IS_BUILTIN_SPECIAL(b) ((b)->name[0] & 1)
7734 /* "regular" builtins always take precedence over commands,
7735 * regardless of PATH=....%builtin... position */
7736 #define IS_BUILTIN_REGULAR(b) ((b)->name[0] & 2)
7737 #define IS_BUILTIN_ASSIGN(b) ((b)->name[0] & 4)
7740 smallint cmdtype; /* CMDxxx */
7743 /* index >= 0 for commands without path (slashes) */
7744 /* (TODO: what exactly does the value mean? PATH position?) */
7745 /* index == -1 for commands with slashes */
7746 /* index == (-2 - applet_no) for NOFORK applets */
7747 const struct builtincmd *cmd;
7748 struct funcnode *func;
7751 /* values of cmdtype */
7752 #define CMDUNKNOWN -1 /* no entry in table for command */
7753 #define CMDNORMAL 0 /* command is an executable program */
7754 #define CMDFUNCTION 1 /* command is a shell function */
7755 #define CMDBUILTIN 2 /* command is a shell builtin */
7757 /* action to find_command() */
7758 #define DO_ERR 0x01 /* prints errors */
7759 #define DO_ABS 0x02 /* checks absolute paths */
7760 #define DO_NOFUNC 0x04 /* don't return shell functions, for command */
7761 #define DO_ALTPATH 0x08 /* using alternate path */
7762 #define DO_ALTBLTIN 0x20 /* %builtin in alt. path */
7764 static void find_command(char *, struct cmdentry *, int, const char *);
7767 /* ============ Hashing commands */
7770 * When commands are first encountered, they are entered in a hash table.
7771 * This ensures that a full path search will not have to be done for them
7772 * on each invocation.
7774 * We should investigate converting to a linear search, even though that
7775 * would make the command name "hash" a misnomer.
7779 struct tblentry *next; /* next entry in hash chain */
7780 union param param; /* definition of builtin function */
7781 smallint cmdtype; /* CMDxxx */
7782 char rehash; /* if set, cd done since entry created */
7783 char cmdname[1]; /* name of command */
7786 static struct tblentry **cmdtable;
7787 #define INIT_G_cmdtable() do { \
7788 cmdtable = xzalloc(CMDTABLESIZE * sizeof(cmdtable[0])); \
7791 static int builtinloc = -1; /* index in path of %builtin, or -1 */
7795 tryexec(IF_FEATURE_SH_STANDALONE(int applet_no,) const char *cmd, char **argv, char **envp)
7797 #if ENABLE_FEATURE_SH_STANDALONE
7798 if (applet_no >= 0) {
7799 if (APPLET_IS_NOEXEC(applet_no)) {
7803 popredir(/*drop:*/ 1);
7804 run_noexec_applet_and_exit(applet_no, cmd, argv);
7806 /* re-exec ourselves with the new arguments */
7807 execve(bb_busybox_exec_path, argv, envp);
7808 /* If they called chroot or otherwise made the binary no longer
7809 * executable, fall through */
7816 execve(cmd, argv, envp);
7817 } while (errno == EINTR);
7819 execve(cmd, argv, envp);
7821 if (cmd != bb_busybox_exec_path && errno == ENOEXEC) {
7822 /* Run "cmd" as a shell script:
7823 * http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html
7824 * "If the execve() function fails with ENOEXEC, the shell
7825 * shall execute a command equivalent to having a shell invoked
7826 * with the command name as its first operand,
7827 * with any remaining arguments passed to the new shell"
7829 * That is, do not use $SHELL, user's shell, or /bin/sh;
7830 * just call ourselves.
7832 * Note that bash reads ~80 chars of the file, and if it sees
7833 * a zero byte before it sees newline, it doesn't try to
7834 * interpret it, but fails with "cannot execute binary file"
7835 * message and exit code 126. For one, this prevents attempts
7836 * to interpret foreign ELF binaries as shell scripts.
7838 argv[0] = (char*) cmd;
7839 cmd = bb_busybox_exec_path;
7840 /* NB: this is only possible because all callers of shellexec()
7841 * ensure that the argv[-1] slot exists!
7844 argv[0] = (char*) "ash";
7850 * Exec a program. Never returns. If you change this routine, you may
7851 * have to change the find_command routine as well.
7852 * argv[-1] must exist and be writable! See tryexec() for why.
7854 static void shellexec(char *prog, char **argv, const char *path, int idx) NORETURN;
7855 static void shellexec(char *prog, char **argv, const char *path, int idx)
7861 int applet_no = -1; /* used only by FEATURE_SH_STANDALONE */
7863 envp = listvars(VEXPORT, VUNSET, /*end:*/ NULL);
7864 if (strchr(prog, '/') != NULL
7865 #if ENABLE_FEATURE_SH_STANDALONE
7866 || (applet_no = find_applet_by_name(prog)) >= 0
7869 tryexec(IF_FEATURE_SH_STANDALONE(applet_no,) prog, argv, envp);
7870 if (applet_no >= 0) {
7871 /* We tried execing ourself, but it didn't work.
7872 * Maybe /proc/self/exe doesn't exist?
7881 while ((cmdname = path_advance(&path, prog)) != NULL) {
7882 if (--idx < 0 && pathopt == NULL) {
7883 tryexec(IF_FEATURE_SH_STANDALONE(-1,) cmdname, argv, envp);
7884 if (errno != ENOENT && errno != ENOTDIR)
7891 /* Map to POSIX errors */
7903 exitstatus = exerrno;
7904 TRACE(("shellexec failed for %s, errno %d, suppress_int %d\n",
7905 prog, e, suppress_int));
7906 ash_msg_and_raise(EXEXIT, "%s: %s", prog, errmsg(e, "not found"));
7911 printentry(struct tblentry *cmdp)
7917 idx = cmdp->param.index;
7920 name = path_advance(&path, cmdp->cmdname);
7922 } while (--idx >= 0);
7923 out1fmt("%s%s\n", name, (cmdp->rehash ? "*" : nullstr));
7927 * Clear out command entries. The argument specifies the first entry in
7928 * PATH which has changed.
7931 clearcmdentry(int firstchange)
7933 struct tblentry **tblp;
7934 struct tblentry **pp;
7935 struct tblentry *cmdp;
7938 for (tblp = cmdtable; tblp < &cmdtable[CMDTABLESIZE]; tblp++) {
7940 while ((cmdp = *pp) != NULL) {
7941 if ((cmdp->cmdtype == CMDNORMAL &&
7942 cmdp->param.index >= firstchange)
7943 || (cmdp->cmdtype == CMDBUILTIN &&
7944 builtinloc >= firstchange)
7957 * Locate a command in the command hash table. If "add" is nonzero,
7958 * add the command to the table if it is not already present. The
7959 * variable "lastcmdentry" is set to point to the address of the link
7960 * pointing to the entry, so that delete_cmd_entry can delete the
7963 * Interrupts must be off if called with add != 0.
7965 static struct tblentry **lastcmdentry;
7967 static struct tblentry *
7968 cmdlookup(const char *name, int add)
7970 unsigned int hashval;
7972 struct tblentry *cmdp;
7973 struct tblentry **pp;
7976 hashval = (unsigned char)*p << 4;
7978 hashval += (unsigned char)*p++;
7980 pp = &cmdtable[hashval % CMDTABLESIZE];
7981 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7982 if (strcmp(cmdp->cmdname, name) == 0)
7986 if (add && cmdp == NULL) {
7987 cmdp = *pp = ckzalloc(sizeof(struct tblentry)
7989 /* + 1 - already done because
7990 * tblentry::cmdname is char[1] */);
7991 /*cmdp->next = NULL; - ckzalloc did it */
7992 cmdp->cmdtype = CMDUNKNOWN;
7993 strcpy(cmdp->cmdname, name);
8000 * Delete the command entry returned on the last lookup.
8003 delete_cmd_entry(void)
8005 struct tblentry *cmdp;
8008 cmdp = *lastcmdentry;
8009 *lastcmdentry = cmdp->next;
8010 if (cmdp->cmdtype == CMDFUNCTION)
8011 freefunc(cmdp->param.func);
8017 * Add a new command entry, replacing any existing command entry for
8018 * the same name - except special builtins.
8021 addcmdentry(char *name, struct cmdentry *entry)
8023 struct tblentry *cmdp;
8025 cmdp = cmdlookup(name, 1);
8026 if (cmdp->cmdtype == CMDFUNCTION) {
8027 freefunc(cmdp->param.func);
8029 cmdp->cmdtype = entry->cmdtype;
8030 cmdp->param = entry->u;
8034 static int FAST_FUNC
8035 hashcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
8037 struct tblentry **pp;
8038 struct tblentry *cmdp;
8040 struct cmdentry entry;
8043 if (nextopt("r") != '\0') {
8048 if (*argptr == NULL) {
8049 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
8050 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
8051 if (cmdp->cmdtype == CMDNORMAL)
8059 while ((name = *argptr) != NULL) {
8060 cmdp = cmdlookup(name, 0);
8062 && (cmdp->cmdtype == CMDNORMAL
8063 || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))
8067 find_command(name, &entry, DO_ERR, pathval());
8068 if (entry.cmdtype == CMDUNKNOWN)
8076 * Called when a cd is done. Marks all commands so the next time they
8077 * are executed they will be rehashed.
8082 struct tblentry **pp;
8083 struct tblentry *cmdp;
8085 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
8086 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
8087 if (cmdp->cmdtype == CMDNORMAL
8088 || (cmdp->cmdtype == CMDBUILTIN
8089 && !IS_BUILTIN_REGULAR(cmdp->param.cmd)
8099 * Fix command hash table when PATH changed.
8100 * Called before PATH is changed. The argument is the new value of PATH;
8101 * pathval() still returns the old value at this point.
8102 * Called with interrupts off.
8104 static void FAST_FUNC
8105 changepath(const char *new)
8113 firstchange = 9999; /* assume no change */
8119 if ((*old == '\0' && *new == ':')
8120 || (*old == ':' && *new == '\0')
8124 old = new; /* ignore subsequent differences */
8128 if (*new == '%' && idx_bltin < 0 && prefix(new + 1, "builtin"))
8135 if (builtinloc < 0 && idx_bltin >= 0)
8136 builtinloc = idx_bltin; /* zap builtins */
8137 if (builtinloc >= 0 && idx_bltin < 0)
8139 clearcmdentry(firstchange);
8140 builtinloc = idx_bltin;
8176 typedef smallint token_id_t;
8178 /* Nth bit indicates if token marks the end of a list */
8181 /* 0 */ | (1u << TEOF)
8182 /* 1 */ | (0u << TNL)
8183 /* 2 */ | (0u << TREDIR)
8184 /* 3 */ | (0u << TWORD)
8185 /* 4 */ | (0u << TSEMI)
8186 /* 5 */ | (0u << TBACKGND)
8187 /* 6 */ | (0u << TAND)
8188 /* 7 */ | (0u << TOR)
8189 /* 8 */ | (0u << TPIPE)
8190 /* 9 */ | (0u << TLP)
8191 /* 10 */ | (1u << TRP)
8192 /* 11 */ | (1u << TENDCASE)
8193 /* 12 */ | (1u << TENDBQUOTE)
8194 /* 13 */ | (0u << TNOT)
8195 /* 14 */ | (0u << TCASE)
8196 /* 15 */ | (1u << TDO)
8197 /* 16 */ | (1u << TDONE)
8198 /* 17 */ | (1u << TELIF)
8199 /* 18 */ | (1u << TELSE)
8200 /* 19 */ | (1u << TESAC)
8201 /* 20 */ | (1u << TFI)
8202 /* 21 */ | (0u << TFOR)
8204 /* 22 */ | (0u << TFUNCTION)
8206 /* 23 */ | (0u << TIF)
8207 /* 24 */ | (0u << TIN)
8208 /* 25 */ | (1u << TTHEN)
8209 /* 26 */ | (0u << TUNTIL)
8210 /* 27 */ | (0u << TWHILE)
8211 /* 28 */ | (0u << TBEGIN)
8212 /* 29 */ | (1u << TEND)
8213 , /* thus far 29 bits used */
8216 static const char *const tokname_array[] = {
8230 #define KWDOFFSET 13
8231 /* the following are keywords */
8253 /* Wrapper around strcmp for qsort/bsearch/... */
8255 pstrcmp(const void *a, const void *b)
8257 return strcmp((char*)a, *(char**)b);
8260 static const char *const *
8261 findkwd(const char *s)
8263 return bsearch(s, tokname_array + KWDOFFSET,
8264 ARRAY_SIZE(tokname_array) - KWDOFFSET,
8265 sizeof(tokname_array[0]), pstrcmp);
8269 * Locate and print what a word is...
8272 describe_command(char *command, const char *path, int describe_command_verbose)
8274 struct cmdentry entry;
8275 #if ENABLE_ASH_ALIAS
8276 const struct alias *ap;
8279 path = path ? path : pathval();
8281 if (describe_command_verbose) {
8285 /* First look at the keywords */
8286 if (findkwd(command)) {
8287 out1str(describe_command_verbose ? " is a shell keyword" : command);
8291 #if ENABLE_ASH_ALIAS
8292 /* Then look at the aliases */
8293 ap = lookupalias(command, 0);
8295 if (!describe_command_verbose) {
8300 out1fmt(" is an alias for %s", ap->val);
8305 find_command(command, &entry, DO_ABS, path);
8307 switch (entry.cmdtype) {
8309 int j = entry.u.index;
8315 p = path_advance(&path, command);
8319 if (describe_command_verbose) {
8320 out1fmt(" is %s", p);
8328 if (describe_command_verbose) {
8329 out1str(" is a shell function");
8336 if (describe_command_verbose) {
8337 out1fmt(" is a %sshell builtin",
8338 IS_BUILTIN_SPECIAL(entry.u.cmd) ?
8339 "special " : nullstr
8347 if (describe_command_verbose) {
8348 out1str(": not found\n");
8357 static int FAST_FUNC
8358 typecmd(int argc UNUSED_PARAM, char **argv)
8364 /* type -p ... ? (we don't bother checking for 'p') */
8365 if (argv[1] && argv[1][0] == '-') {
8370 err |= describe_command(argv[i++], NULL, verbose);
8375 #if ENABLE_ASH_CMDCMD
8376 /* Is it "command [-p] PROG ARGS" bltin, no other opts? Return ptr to "PROG" if yes */
8378 parse_command_args(char **argv, const char **path)
8391 if (c == '-' && !*cp) {
8399 *path = bb_default_path;
8402 /* run 'typecmd' for other options */
8411 static int FAST_FUNC
8412 commandcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
8420 const char *path = NULL;
8422 /* "command [-p] PROG ARGS" (that is, without -V or -v)
8423 * never reaches this function.
8426 while ((c = nextopt("pvV")) != '\0')
8428 verify |= VERIFY_VERBOSE;
8430 /*verify |= VERIFY_BRIEF*/;
8436 path = bb_default_path;
8438 /* Mimic bash: just "command -v" doesn't complain, it's a nop */
8440 if (/*verify && */ cmd)
8441 return describe_command(cmd, path, verify /* - VERIFY_BRIEF*/);
8448 /*static int funcblocksize; // size of structures in function */
8449 /*static int funcstringsize; // size of strings in node */
8450 static void *funcblock; /* block to allocate function from */
8451 static char *funcstring_end; /* end of block to allocate strings from */
8453 static const uint8_t nodesize[N_NUMBER] ALIGN1 = {
8454 [NCMD ] = SHELL_ALIGN(sizeof(struct ncmd)),
8455 [NPIPE ] = SHELL_ALIGN(sizeof(struct npipe)),
8456 [NREDIR ] = SHELL_ALIGN(sizeof(struct nredir)),
8457 [NBACKGND ] = SHELL_ALIGN(sizeof(struct nredir)),
8458 [NSUBSHELL] = SHELL_ALIGN(sizeof(struct nredir)),
8459 [NAND ] = SHELL_ALIGN(sizeof(struct nbinary)),
8460 [NOR ] = SHELL_ALIGN(sizeof(struct nbinary)),
8461 [NSEMI ] = SHELL_ALIGN(sizeof(struct nbinary)),
8462 [NIF ] = SHELL_ALIGN(sizeof(struct nif)),
8463 [NWHILE ] = SHELL_ALIGN(sizeof(struct nbinary)),
8464 [NUNTIL ] = SHELL_ALIGN(sizeof(struct nbinary)),
8465 [NFOR ] = SHELL_ALIGN(sizeof(struct nfor)),
8466 [NCASE ] = SHELL_ALIGN(sizeof(struct ncase)),
8467 [NCLIST ] = SHELL_ALIGN(sizeof(struct nclist)),
8468 [NDEFUN ] = SHELL_ALIGN(sizeof(struct narg)),
8469 [NARG ] = SHELL_ALIGN(sizeof(struct narg)),
8470 [NTO ] = SHELL_ALIGN(sizeof(struct nfile)),
8471 #if BASH_REDIR_OUTPUT
8472 [NTO2 ] = SHELL_ALIGN(sizeof(struct nfile)),
8474 [NCLOBBER ] = SHELL_ALIGN(sizeof(struct nfile)),
8475 [NFROM ] = SHELL_ALIGN(sizeof(struct nfile)),
8476 [NFROMTO ] = SHELL_ALIGN(sizeof(struct nfile)),
8477 [NAPPEND ] = SHELL_ALIGN(sizeof(struct nfile)),
8478 [NTOFD ] = SHELL_ALIGN(sizeof(struct ndup)),
8479 [NFROMFD ] = SHELL_ALIGN(sizeof(struct ndup)),
8480 [NHERE ] = SHELL_ALIGN(sizeof(struct nhere)),
8481 [NXHERE ] = SHELL_ALIGN(sizeof(struct nhere)),
8482 [NNOT ] = SHELL_ALIGN(sizeof(struct nnot)),
8485 static int calcsize(int funcblocksize, union node *n);
8488 sizenodelist(int funcblocksize, struct nodelist *lp)
8491 funcblocksize += SHELL_ALIGN(sizeof(struct nodelist));
8492 funcblocksize = calcsize(funcblocksize, lp->n);
8495 return funcblocksize;
8499 calcsize(int funcblocksize, union node *n)
8502 return funcblocksize;
8503 funcblocksize += nodesize[n->type];
8506 funcblocksize = calcsize(funcblocksize, n->ncmd.redirect);
8507 funcblocksize = calcsize(funcblocksize, n->ncmd.args);
8508 funcblocksize = calcsize(funcblocksize, n->ncmd.assign);
8511 funcblocksize = sizenodelist(funcblocksize, n->npipe.cmdlist);
8516 funcblocksize = calcsize(funcblocksize, n->nredir.redirect);
8517 funcblocksize = calcsize(funcblocksize, n->nredir.n);
8524 funcblocksize = calcsize(funcblocksize, n->nbinary.ch2);
8525 funcblocksize = calcsize(funcblocksize, n->nbinary.ch1);
8528 funcblocksize = calcsize(funcblocksize, n->nif.elsepart);
8529 funcblocksize = calcsize(funcblocksize, n->nif.ifpart);
8530 funcblocksize = calcsize(funcblocksize, n->nif.test);
8533 funcblocksize += SHELL_ALIGN(strlen(n->nfor.var) + 1); /* was funcstringsize += ... */
8534 funcblocksize = calcsize(funcblocksize, n->nfor.body);
8535 funcblocksize = calcsize(funcblocksize, n->nfor.args);
8538 funcblocksize = calcsize(funcblocksize, n->ncase.cases);
8539 funcblocksize = calcsize(funcblocksize, n->ncase.expr);
8542 funcblocksize = calcsize(funcblocksize, n->nclist.body);
8543 funcblocksize = calcsize(funcblocksize, n->nclist.pattern);
8544 funcblocksize = calcsize(funcblocksize, n->nclist.next);
8548 funcblocksize = sizenodelist(funcblocksize, n->narg.backquote);
8549 funcblocksize += SHELL_ALIGN(strlen(n->narg.text) + 1); /* was funcstringsize += ... */
8550 funcblocksize = calcsize(funcblocksize, n->narg.next);
8553 #if BASH_REDIR_OUTPUT
8560 funcblocksize = calcsize(funcblocksize, n->nfile.fname);
8561 funcblocksize = calcsize(funcblocksize, n->nfile.next);
8565 funcblocksize = calcsize(funcblocksize, n->ndup.vname);
8566 funcblocksize = calcsize(funcblocksize, n->ndup.next);
8570 funcblocksize = calcsize(funcblocksize, n->nhere.doc);
8571 funcblocksize = calcsize(funcblocksize, n->nhere.next);
8574 funcblocksize = calcsize(funcblocksize, n->nnot.com);
8577 return funcblocksize;
8581 nodeckstrdup(char *s)
8583 funcstring_end -= SHELL_ALIGN(strlen(s) + 1);
8584 return strcpy(funcstring_end, s);
8587 static union node *copynode(union node *);
8589 static struct nodelist *
8590 copynodelist(struct nodelist *lp)
8592 struct nodelist *start;
8593 struct nodelist **lpp;
8598 funcblock = (char *) funcblock + SHELL_ALIGN(sizeof(struct nodelist));
8599 (*lpp)->n = copynode(lp->n);
8601 lpp = &(*lpp)->next;
8608 copynode(union node *n)
8615 funcblock = (char *) funcblock + nodesize[n->type];
8619 new->ncmd.redirect = copynode(n->ncmd.redirect);
8620 new->ncmd.args = copynode(n->ncmd.args);
8621 new->ncmd.assign = copynode(n->ncmd.assign);
8624 new->npipe.cmdlist = copynodelist(n->npipe.cmdlist);
8625 new->npipe.pipe_backgnd = n->npipe.pipe_backgnd;
8630 new->nredir.redirect = copynode(n->nredir.redirect);
8631 new->nredir.n = copynode(n->nredir.n);
8638 new->nbinary.ch2 = copynode(n->nbinary.ch2);
8639 new->nbinary.ch1 = copynode(n->nbinary.ch1);
8642 new->nif.elsepart = copynode(n->nif.elsepart);
8643 new->nif.ifpart = copynode(n->nif.ifpart);
8644 new->nif.test = copynode(n->nif.test);
8647 new->nfor.var = nodeckstrdup(n->nfor.var);
8648 new->nfor.body = copynode(n->nfor.body);
8649 new->nfor.args = copynode(n->nfor.args);
8652 new->ncase.cases = copynode(n->ncase.cases);
8653 new->ncase.expr = copynode(n->ncase.expr);
8656 new->nclist.body = copynode(n->nclist.body);
8657 new->nclist.pattern = copynode(n->nclist.pattern);
8658 new->nclist.next = copynode(n->nclist.next);
8662 new->narg.backquote = copynodelist(n->narg.backquote);
8663 new->narg.text = nodeckstrdup(n->narg.text);
8664 new->narg.next = copynode(n->narg.next);
8667 #if BASH_REDIR_OUTPUT
8674 new->nfile.fname = copynode(n->nfile.fname);
8675 new->nfile.fd = n->nfile.fd;
8676 new->nfile.next = copynode(n->nfile.next);
8680 new->ndup.vname = copynode(n->ndup.vname);
8681 new->ndup.dupfd = n->ndup.dupfd;
8682 new->ndup.fd = n->ndup.fd;
8683 new->ndup.next = copynode(n->ndup.next);
8687 new->nhere.doc = copynode(n->nhere.doc);
8688 new->nhere.fd = n->nhere.fd;
8689 new->nhere.next = copynode(n->nhere.next);
8692 new->nnot.com = copynode(n->nnot.com);
8695 new->type = n->type;
8700 * Make a copy of a parse tree.
8702 static struct funcnode *
8703 copyfunc(union node *n)
8708 /*funcstringsize = 0;*/
8709 blocksize = offsetof(struct funcnode, n) + calcsize(0, n);
8710 f = ckzalloc(blocksize /* + funcstringsize */);
8711 funcblock = (char *) f + offsetof(struct funcnode, n);
8712 funcstring_end = (char *) f + blocksize;
8714 /* f->count = 0; - ckzalloc did it */
8719 * Define a shell function.
8722 defun(union node *func)
8724 struct cmdentry entry;
8727 entry.cmdtype = CMDFUNCTION;
8728 entry.u.func = copyfunc(func);
8729 addcmdentry(func->narg.text, &entry);
8733 /* Reasons for skipping commands (see comment on breakcmd routine) */
8734 #define SKIPBREAK (1 << 0)
8735 #define SKIPCONT (1 << 1)
8736 #define SKIPFUNC (1 << 2)
8737 static smallint evalskip; /* set to SKIPxxx if we are skipping commands */
8738 static int skipcount; /* number of levels to skip */
8739 static int funcnest; /* depth of function calls */
8740 static int loopnest; /* current loop nesting level */
8742 /* Forward decl way out to parsing code - dotrap needs it */
8743 static int evalstring(char *s, int flags);
8745 /* Called to execute a trap.
8746 * Single callsite - at the end of evaltree().
8747 * If we return non-zero, evaltree raises EXEXIT exception.
8749 * Perhaps we should avoid entering new trap handlers
8750 * while we are executing a trap handler. [is it a TODO?]
8757 uint8_t last_status;
8762 last_status = exitstatus;
8766 TRACE(("dotrap entered\n"));
8767 for (sig = 1, g = gotsig; sig < NSIG; sig++, g++) {
8779 /* non-trapped SIGINT is handled separately by raise_interrupt,
8780 * don't upset it by resetting gotsig[SIGINT-1] */
8781 if (sig == SIGINT && !p)
8784 TRACE(("sig %d is active, will run handler '%s'\n", sig, p));
8790 exitstatus = last_status;
8791 TRACE(("dotrap returns\n"));
8794 /* forward declarations - evaluation is fairly recursive business... */
8795 static int evalloop(union node *, int);
8796 static int evalfor(union node *, int);
8797 static int evalcase(union node *, int);
8798 static int evalsubshell(union node *, int);
8799 static void expredir(union node *);
8800 static int evalpipe(union node *, int);
8801 static int evalcommand(union node *, int);
8802 static int evalbltin(const struct builtincmd *, int, char **, int);
8803 static void prehash(union node *);
8806 * Evaluate a parse tree. The value is left in the global variable
8810 evaltree(union node *n, int flags)
8813 int (*evalfn)(union node *, int);
8817 TRACE(("evaltree(NULL) called\n"));
8820 TRACE(("evaltree(%p: %d, %d) called\n", n, n->type, flags));
8827 out1fmt("Node type = %d\n", n->type);
8832 status = !evaltree(n->nnot.com, EV_TESTED);
8835 expredir(n->nredir.redirect);
8836 pushredir(n->nredir.redirect);
8837 status = redirectsafe(n->nredir.redirect, REDIR_PUSH);
8839 status = evaltree(n->nredir.n, flags & EV_TESTED);
8841 if (n->nredir.redirect)
8842 popredir(/*drop:*/ 0);
8845 evalfn = evalcommand;
8847 if (eflag && !(flags & EV_TESTED))
8859 evalfn = evalsubshell;
8872 #error NAND + 1 != NOR
8874 #if NOR + 1 != NSEMI
8875 #error NOR + 1 != NSEMI
8877 unsigned is_or = n->type - NAND;
8880 (flags | ((is_or >> 1) - 1)) & EV_TESTED
8882 if ((!status) == is_or || evalskip)
8888 status = evalfn(n, flags);
8892 status = evaltree(n->nif.test, EV_TESTED);
8899 if (n->nif.elsepart) {
8900 n = n->nif.elsepart;
8907 /* Not necessary. To test it:
8908 * "false; f() { qwerty; }; echo $?" should print 0.
8912 exitstatus = status;
8916 /* Order of checks below is important:
8917 * signal handlers trigger before exit caused by "set -e".
8921 if (checkexit & status)
8922 raise_exception(EXEXIT);
8923 if (flags & EV_EXIT)
8924 raise_exception(EXEXIT);
8926 TRACE(("leaving evaltree (no interrupts)\n"));
8933 int skip = evalskip;
8940 if (--skipcount <= 0) {
8951 evalloop(union node *n, int flags)
8962 i = evaltree(n->nbinary.ch1, EV_TESTED);
8964 if (skip == SKIPFUNC)
8968 if (n->type != NWHILE)
8972 status = evaltree(n->nbinary.ch2, flags);
8974 } while (!(skip & ~SKIPCONT));
8981 evalfor(union node *n, int flags)
8983 struct arglist arglist;
8986 struct stackmark smark;
8989 setstackmark(&smark);
8990 arglist.list = NULL;
8991 arglist.lastp = &arglist.list;
8992 for (argp = n->nfor.args; argp; argp = argp->narg.next) {
8993 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
8995 *arglist.lastp = NULL;
8999 for (sp = arglist.list; sp; sp = sp->next) {
9000 setvar0(n->nfor.var, sp->text);
9001 status = evaltree(n->nfor.body, flags);
9002 if (skiploop() & ~SKIPCONT)
9006 popstackmark(&smark);
9012 evalcase(union node *n, int flags)
9016 struct arglist arglist;
9017 struct stackmark smark;
9020 setstackmark(&smark);
9021 arglist.list = NULL;
9022 arglist.lastp = &arglist.list;
9023 expandarg(n->ncase.expr, &arglist, EXP_TILDE);
9024 for (cp = n->ncase.cases; cp && evalskip == 0; cp = cp->nclist.next) {
9025 for (patp = cp->nclist.pattern; patp; patp = patp->narg.next) {
9026 if (casematch(patp, arglist.list->text)) {
9027 /* Ensure body is non-empty as otherwise
9028 * EV_EXIT may prevent us from setting the
9031 if (evalskip == 0 && cp->nclist.body) {
9032 status = evaltree(cp->nclist.body, flags);
9039 popstackmark(&smark);
9045 * Kick off a subshell to evaluate a tree.
9048 evalsubshell(union node *n, int flags)
9051 int backgnd = (n->type == NBACKGND); /* FORK_BG(1) if yes, else FORK_FG(0) */
9054 expredir(n->nredir.redirect);
9055 if (!backgnd && (flags & EV_EXIT) && !may_have_traps)
9058 if (backgnd == FORK_FG)
9060 jp = makejob(/*n,*/ 1);
9061 if (forkshell(jp, n, backgnd) == 0) {
9066 flags &= ~EV_TESTED;
9068 redirect(n->nredir.redirect, 0);
9069 evaltreenr(n->nredir.n, flags);
9074 if (backgnd == FORK_FG)
9075 status = waitforjob(jp);
9081 * Compute the names of the files in a redirection list.
9083 static void fixredir(union node *, const char *, int);
9085 expredir(union node *n)
9089 for (redir = n; redir; redir = redir->nfile.next) {
9093 fn.lastp = &fn.list;
9094 switch (redir->type) {
9098 #if BASH_REDIR_OUTPUT
9103 expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR);
9104 TRACE(("expredir expanded to '%s'\n", fn.list->text));
9105 #if BASH_REDIR_OUTPUT
9109 // By the design of stack allocator, the loop of this kind:
9110 // while true; do while true; do break; done </dev/null; done
9111 // will look like a memory leak: ash plans to free expfname's
9112 // of "/dev/null" as soon as it finishes running the loop
9113 // (in this case, never).
9114 // This "fix" is wrong:
9115 if (redir->nfile.expfname)
9116 stunalloc(redir->nfile.expfname);
9117 // It results in corrupted state of stacked allocations.
9119 redir->nfile.expfname = fn.list->text;
9122 case NTOFD: /* >& */
9123 if (redir->ndup.vname) {
9124 expandarg(redir->ndup.vname, &fn, EXP_FULL | EXP_TILDE);
9125 if (fn.list == NULL)
9126 ash_msg_and_raise_error("redir error");
9127 #if BASH_REDIR_OUTPUT
9128 //FIXME: we used expandarg with different args!
9129 if (!isdigit_str9(fn.list->text)) {
9130 /* >&file, not >&fd */
9131 if (redir->nfile.fd != 1) /* 123>&file - BAD */
9132 ash_msg_and_raise_error("redir error");
9134 goto store_expfname;
9137 fixredir(redir, fn.list->text, 1);
9145 * Evaluate a pipeline. All the processes in the pipeline are children
9146 * of the process creating the pipeline. (This differs from some versions
9147 * of the shell, which make the last process in a pipeline the parent
9151 evalpipe(union node *n, int flags)
9154 struct nodelist *lp;
9160 TRACE(("evalpipe(0x%lx) called\n", (long)n));
9162 for (lp = n->npipe.cmdlist; lp; lp = lp->next)
9166 if (n->npipe.pipe_backgnd == 0)
9168 jp = makejob(/*n,*/ pipelen);
9170 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
9174 if (pipe(pip) < 0) {
9176 ash_msg_and_raise_perror("can't create pipe");
9179 if (forkshell(jp, lp->n, n->npipe.pipe_backgnd) == 0) {
9193 evaltreenr(lp->n, flags);
9200 /* Don't want to trigger debugging */
9204 if (n->npipe.pipe_backgnd == 0) {
9205 status = waitforjob(jp);
9206 TRACE(("evalpipe: job done exit status %d\n", status));
9214 * Controls whether the shell is interactive or not.
9217 setinteractive(int on)
9219 static smallint is_interactive;
9221 if (++on == is_interactive)
9223 is_interactive = on;
9227 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
9228 if (is_interactive > 1) {
9229 /* Looks like they want an interactive shell */
9230 static smallint did_banner;
9233 /* note: ash and hush share this string */
9234 out1fmt("\n\n%s %s\n"
9235 IF_ASH_HELP("Enter 'help' for a list of built-in commands.\n")
9238 "built-in shell (ash)"
9252 setinteractive(iflag);
9254 #if ENABLE_FEATURE_EDITING_VI
9256 line_input_state->flags |= VI_MODE;
9258 line_input_state->flags &= ~VI_MODE;
9260 viflag = 0; /* forcibly keep the option off */
9264 struct localvar_list {
9265 struct localvar_list *next;
9266 struct localvar *lv;
9269 static struct localvar_list *localvar_stack;
9272 * Called after a function returns.
9273 * Interrupts must be off.
9276 poplocalvars(int keep)
9278 struct localvar_list *ll;
9279 struct localvar *lvp, *next;
9283 ll = localvar_stack;
9284 localvar_stack = ll->next;
9289 while ((lvp = next) != NULL) {
9292 TRACE(("poplocalvar %s\n", vp ? vp->var_text : "-"));
9294 int bits = VSTRFIXED;
9296 if (lvp->flags != VUNSET) {
9297 if (vp->var_text == lvp->text)
9299 else if (!(lvp->flags & (VTEXTFIXED|VSTACK)))
9300 free((char*)lvp->text);
9304 vp->flags |= (lvp->flags & bits);
9307 (VEXPORT|VREADONLY|VSTRFIXED|VUNSET)) == VUNSET)
9308 unsetvar(vp->var_text);
9309 } else if (vp == NULL) { /* $- saved */
9310 memcpy(optlist, lvp->text, sizeof(optlist));
9311 free((char*)lvp->text);
9313 } else if (lvp->flags == VUNSET) {
9314 vp->flags &= ~(VSTRFIXED|VREADONLY);
9315 unsetvar(vp->var_text);
9318 vp->var_func(var_end(lvp->text));
9319 if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
9320 free((char*)vp->var_text);
9321 vp->flags = lvp->flags;
9322 vp->var_text = lvp->text;
9330 * Create a new localvar environment.
9332 static struct localvar_list *
9335 struct localvar_list *ll;
9338 ll = ckzalloc(sizeof(*ll));
9339 /*ll->lv = NULL; - zalloc did it */
9340 ll->next = localvar_stack;
9341 localvar_stack = ll;
9348 unwindlocalvars(struct localvar_list *stop)
9350 while (localvar_stack != stop)
9355 evalfun(struct funcnode *func, int argc, char **argv, int flags)
9357 volatile struct shparam saveparam;
9358 struct jmploc *volatile savehandler;
9359 struct jmploc jmploc;
9362 saveparam = shellparam;
9363 savehandler = exception_handler;
9364 e = setjmp(jmploc.loc);
9369 exception_handler = &jmploc;
9370 shellparam.malloced = 0;
9374 shellparam.nparam = argc - 1;
9375 shellparam.p = argv + 1;
9376 #if ENABLE_ASH_GETOPTS
9377 shellparam.optind = 1;
9378 shellparam.optoff = -1;
9381 evaltree(func->n.narg.next, flags & EV_TESTED);
9387 freeparam(&shellparam);
9388 shellparam = saveparam;
9389 exception_handler = savehandler;
9391 evalskip &= ~SKIPFUNC;
9396 * Make a variable a local variable. When a variable is made local, it's
9397 * value and flags are saved in a localvar structure. The saved values
9398 * will be restored when the shell function returns. We handle the name
9399 * "-" as a special case: it makes changes to "set +-options" local
9400 * (options will be restored on return from the function).
9405 struct localvar *lvp;
9408 char *eq = strchr(name, '=');
9411 /* Cater for duplicate "local". Examples:
9412 * x=0; f() { local x=1; echo $x; local x; echo $x; }; f; echo $x
9413 * x=0; f() { local x=1; echo $x; local x=2; echo $x; }; f; echo $x
9415 lvp = localvar_stack->lv;
9417 if (lvp->vp && varcmp(lvp->vp->var_text, name) == 0) {
9421 * it's a duplicate "local VAR" declaration, do nothing
9428 lvp = ckzalloc(sizeof(*lvp));
9429 if (LONE_DASH(name)) {
9431 p = ckmalloc(sizeof(optlist));
9432 lvp->text = memcpy(p, optlist, sizeof(optlist));
9435 vpp = hashvar(name);
9436 vp = *findvar(vpp, name);
9438 /* variable did not exist yet */
9440 vp = setvareq(name, VSTRFIXED);
9442 vp = setvar(name, NULL, VSTRFIXED);
9443 lvp->flags = VUNSET;
9445 lvp->text = vp->var_text;
9446 lvp->flags = vp->flags;
9447 /* make sure neither "struct var" nor string gets freed
9448 * during (un)setting:
9450 vp->flags |= VSTRFIXED|VTEXTFIXED;
9454 /* "local VAR" unsets VAR: */
9455 setvar0(name, NULL);
9459 lvp->next = localvar_stack->lv;
9460 localvar_stack->lv = lvp;
9466 * The "local" command.
9468 static int FAST_FUNC
9469 localcmd(int argc UNUSED_PARAM, char **argv)
9473 if (!localvar_stack)
9474 ash_msg_and_raise_error("not in a function");
9477 while ((name = *argv++) != NULL) {
9483 static int FAST_FUNC
9484 falsecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
9489 static int FAST_FUNC
9490 truecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
9495 static int FAST_FUNC
9496 execcmd(int argc UNUSED_PARAM, char **argv)
9499 while (nextopt("a:") != '\0')
9500 /* nextopt() sets optionarg to "-a ARGV0" */;
9506 iflag = 0; /* exit on error */
9509 /* We should set up signals for "exec CMD"
9510 * the same way as for "CMD" without "exec".
9511 * But optschanged->setinteractive->setsignal
9512 * still thought we are a root shell. Therefore, for example,
9513 * SIGQUIT is still set to IGN. Fix it:
9517 /*setsignal(SIGTERM); - unnecessary because of iflag=0 */
9518 /*setsignal(SIGTSTP); - unnecessary because of mflag=0 */
9519 /*setsignal(SIGTTOU); - unnecessary because of mflag=0 */
9523 argv[0] = optionarg;
9524 shellexec(prog, argv, pathval(), 0);
9531 * The return command.
9533 static int FAST_FUNC
9534 returncmd(int argc UNUSED_PARAM, char **argv)
9537 * If called outside a function, do what ksh does;
9538 * skip the rest of the file.
9540 evalskip = SKIPFUNC;
9541 return argv[1] ? number(argv[1]) : exitstatus;
9544 /* Forward declarations for builtintab[] */
9545 static int breakcmd(int, char **) FAST_FUNC;
9546 static int dotcmd(int, char **) FAST_FUNC;
9547 static int evalcmd(int, char **, int) FAST_FUNC;
9548 static int exitcmd(int, char **) FAST_FUNC;
9549 static int exportcmd(int, char **) FAST_FUNC;
9550 #if ENABLE_ASH_GETOPTS
9551 static int getoptscmd(int, char **) FAST_FUNC;
9554 static int helpcmd(int, char **) FAST_FUNC;
9557 static int historycmd(int, char **) FAST_FUNC;
9559 #if ENABLE_FEATURE_SH_MATH
9560 static int letcmd(int, char **) FAST_FUNC;
9562 static int readcmd(int, char **) FAST_FUNC;
9563 static int setcmd(int, char **) FAST_FUNC;
9564 static int shiftcmd(int, char **) FAST_FUNC;
9565 static int timescmd(int, char **) FAST_FUNC;
9566 static int trapcmd(int, char **) FAST_FUNC;
9567 static int umaskcmd(int, char **) FAST_FUNC;
9568 static int unsetcmd(int, char **) FAST_FUNC;
9569 static int ulimitcmd(int, char **) FAST_FUNC;
9571 #define BUILTIN_NOSPEC "0"
9572 #define BUILTIN_SPECIAL "1"
9573 #define BUILTIN_REGULAR "2"
9574 #define BUILTIN_SPEC_REG "3"
9575 #define BUILTIN_ASSIGN "4"
9576 #define BUILTIN_SPEC_ASSG "5"
9577 #define BUILTIN_REG_ASSG "6"
9578 #define BUILTIN_SPEC_REG_ASSG "7"
9580 /* Stubs for calling non-FAST_FUNC's */
9582 static int FAST_FUNC echocmd(int argc, char **argv) { return echo_main(argc, argv); }
9584 #if ENABLE_ASH_PRINTF
9585 static int FAST_FUNC printfcmd(int argc, char **argv) { return printf_main(argc, argv); }
9587 #if ENABLE_ASH_TEST || BASH_TEST2
9588 static int FAST_FUNC testcmd(int argc, char **argv) { return test_main(argc, argv); }
9591 /* Keep these in proper order since it is searched via bsearch() */
9592 static const struct builtincmd builtintab[] = {
9593 { BUILTIN_SPEC_REG "." , dotcmd },
9594 { BUILTIN_SPEC_REG ":" , truecmd },
9596 { BUILTIN_REGULAR "[" , testcmd },
9599 { BUILTIN_REGULAR "[[" , testcmd },
9601 #if ENABLE_ASH_ALIAS
9602 { BUILTIN_REG_ASSG "alias" , aliascmd },
9605 { BUILTIN_REGULAR "bg" , fg_bgcmd },
9607 { BUILTIN_SPEC_REG "break" , breakcmd },
9608 { BUILTIN_REGULAR "cd" , cdcmd },
9609 { BUILTIN_NOSPEC "chdir" , cdcmd },
9610 #if ENABLE_ASH_CMDCMD
9611 { BUILTIN_REGULAR "command" , commandcmd },
9613 { BUILTIN_SPEC_REG "continue", breakcmd },
9615 { BUILTIN_REGULAR "echo" , echocmd },
9617 { BUILTIN_SPEC_REG "eval" , NULL }, /*evalcmd() has a differing prototype*/
9618 { BUILTIN_SPEC_REG "exec" , execcmd },
9619 { BUILTIN_SPEC_REG "exit" , exitcmd },
9620 { BUILTIN_SPEC_REG_ASSG "export" , exportcmd },
9621 { BUILTIN_REGULAR "false" , falsecmd },
9623 { BUILTIN_REGULAR "fg" , fg_bgcmd },
9625 #if ENABLE_ASH_GETOPTS
9626 { BUILTIN_REGULAR "getopts" , getoptscmd },
9628 { BUILTIN_NOSPEC "hash" , hashcmd },
9630 { BUILTIN_NOSPEC "help" , helpcmd },
9633 { BUILTIN_NOSPEC "history" , historycmd },
9636 { BUILTIN_REGULAR "jobs" , jobscmd },
9637 { BUILTIN_REGULAR "kill" , killcmd },
9639 #if ENABLE_FEATURE_SH_MATH
9640 { BUILTIN_NOSPEC "let" , letcmd },
9642 { BUILTIN_SPEC_REG_ASSG "local" , localcmd },
9643 #if ENABLE_ASH_PRINTF
9644 { BUILTIN_REGULAR "printf" , printfcmd },
9646 { BUILTIN_NOSPEC "pwd" , pwdcmd },
9647 { BUILTIN_REGULAR "read" , readcmd },
9648 { BUILTIN_SPEC_REG_ASSG "readonly", exportcmd },
9649 { BUILTIN_SPEC_REG "return" , returncmd },
9650 { BUILTIN_SPEC_REG "set" , setcmd },
9651 { BUILTIN_SPEC_REG "shift" , shiftcmd },
9653 { BUILTIN_SPEC_REG "source" , dotcmd },
9656 { BUILTIN_REGULAR "test" , testcmd },
9658 { BUILTIN_SPEC_REG "times" , timescmd },
9659 { BUILTIN_SPEC_REG "trap" , trapcmd },
9660 { BUILTIN_REGULAR "true" , truecmd },
9661 { BUILTIN_NOSPEC "type" , typecmd },
9662 { BUILTIN_NOSPEC "ulimit" , ulimitcmd },
9663 { BUILTIN_REGULAR "umask" , umaskcmd },
9664 #if ENABLE_ASH_ALIAS
9665 { BUILTIN_REGULAR "unalias" , unaliascmd },
9667 { BUILTIN_SPEC_REG "unset" , unsetcmd },
9668 { BUILTIN_REGULAR "wait" , waitcmd },
9671 /* Should match the above table! */
9672 #define COMMANDCMD (builtintab + \
9674 /* [ */ 1 * ENABLE_ASH_TEST + \
9675 /* [[ */ 1 * BASH_TEST2 + \
9676 /* alias */ 1 * ENABLE_ASH_ALIAS + \
9677 /* bg */ 1 * ENABLE_ASH_JOB_CONTROL + \
9678 /* break cd cddir */ 3)
9679 #define EVALCMD (COMMANDCMD + \
9680 /* command */ 1 * ENABLE_ASH_CMDCMD + \
9681 /* continue */ 1 + \
9682 /* echo */ 1 * ENABLE_ASH_ECHO + \
9684 #define EXECCMD (EVALCMD + \
9688 * Search the table of builtin commands.
9691 pstrcmp1(const void *a, const void *b)
9693 return strcmp((char*)a, *(char**)b + 1);
9695 static struct builtincmd *
9696 find_builtin(const char *name)
9698 struct builtincmd *bp;
9701 name, builtintab, ARRAY_SIZE(builtintab), sizeof(builtintab[0]),
9708 * Execute a simple command.
9711 isassignment(const char *p)
9713 const char *q = endofname(p);
9718 static int FAST_FUNC
9719 bltincmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
9721 /* Preserve exitstatus of a previous possible redirection
9722 * as POSIX mandates */
9723 return back_exitstatus;
9726 evalcommand(union node *cmd, int flags)
9728 static const struct builtincmd null_bltin = {
9729 "\0\0", bltincmd /* why three NULs? */
9731 struct localvar_list *localvar_stop;
9732 struct redirtab *redir_stop;
9733 struct stackmark smark;
9735 struct arglist arglist;
9736 struct arglist varlist;
9739 const struct strlist *sp;
9740 struct cmdentry cmdentry;
9747 smallint cmd_is_exec;
9749 /* First expand the arguments. */
9750 TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags));
9751 setstackmark(&smark);
9752 localvar_stop = pushlocalvars();
9753 back_exitstatus = 0;
9755 cmdentry.cmdtype = CMDBUILTIN;
9756 cmdentry.u.cmd = &null_bltin;
9757 varlist.lastp = &varlist.list;
9758 *varlist.lastp = NULL;
9759 arglist.lastp = &arglist.list;
9760 *arglist.lastp = NULL;
9763 if (cmd->ncmd.args) {
9764 struct builtincmd *bcmd;
9765 smallint pseudovarflag;
9767 bcmd = find_builtin(cmd->ncmd.args->narg.text);
9768 pseudovarflag = bcmd && IS_BUILTIN_ASSIGN(bcmd);
9770 for (argp = cmd->ncmd.args; argp; argp = argp->narg.next) {
9771 struct strlist **spp;
9773 spp = arglist.lastp;
9774 if (pseudovarflag && isassignment(argp->narg.text))
9775 expandarg(argp, &arglist, EXP_VARTILDE);
9777 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
9779 for (sp = *spp; sp; sp = sp->next)
9784 /* Reserve one extra spot at the front for shellexec. */
9785 nargv = stalloc(sizeof(char *) * (argc + 2));
9787 for (sp = arglist.list; sp; sp = sp->next) {
9788 TRACE(("evalcommand arg: %s\n", sp->text));
9789 *nargv++ = sp->text;
9794 if (iflag && funcnest == 0 && argc > 0)
9795 lastarg = nargv[-1];
9797 expredir(cmd->ncmd.redirect);
9798 redir_stop = pushredir(cmd->ncmd.redirect);
9800 if (BASH_XTRACEFD && xflag) {
9801 /* NB: bash closes fd == $BASH_XTRACEFD when it is changed.
9802 * we do not emulate this. We only use its value.
9804 const char *xtracefd = lookupvar("BASH_XTRACEFD");
9805 if (xtracefd && is_number(xtracefd))
9806 preverrout_fd = atoi(xtracefd);
9809 status = redirectsafe(cmd->ncmd.redirect, REDIR_PUSH | REDIR_SAVEFD2);
9811 path = vpath.var_text;
9812 for (argp = cmd->ncmd.assign; argp; argp = argp->narg.next) {
9813 struct strlist **spp;
9816 spp = varlist.lastp;
9817 expandarg(argp, &varlist, EXP_VARTILDE);
9819 mklocal((*spp)->text);
9822 * Modify the command lookup path, if a PATH= assignment
9826 if (varcmp(p, path) == 0)
9830 /* Print the command if xflag is set. */
9832 const char *pfx = "";
9834 fdprintf(preverrout_fd, "%s", expandstr(ps4val(), DQSYNTAX));
9838 char *varval = sp->text;
9839 char *eq = strchrnul(varval, '=');
9842 fdprintf(preverrout_fd, "%s%.*s%s",
9844 (int)(eq - varval), varval,
9845 maybe_single_quote(eq)
9853 fdprintf(preverrout_fd, "%s%s",
9855 /* always quote if matches reserved word: */
9857 ? single_quote(sp->text)
9858 : maybe_single_quote(sp->text)
9863 safe_write(preverrout_fd, "\n", 1);
9869 /* Now locate the command. */
9871 int cmd_flag = DO_ERR;
9872 #if ENABLE_ASH_CMDCMD
9873 const char *oldpath = path + 5;
9877 find_command(argv[0], &cmdentry, cmd_flag, path);
9878 if (cmdentry.cmdtype == CMDUNKNOWN) {
9879 flush_stdout_stderr();
9884 /* implement bltin and command here */
9885 if (cmdentry.cmdtype != CMDBUILTIN)
9888 spclbltin = IS_BUILTIN_SPECIAL(cmdentry.u.cmd);
9889 if (cmdentry.u.cmd == EXECCMD)
9891 #if ENABLE_ASH_CMDCMD
9892 if (cmdentry.u.cmd == COMMANDCMD) {
9894 nargv = parse_command_args(argv, &path);
9897 /* It's "command [-p] PROG ARGS" (that is, no -Vv).
9898 * nargv => "PROG". path is updated if -p.
9900 argc -= nargv - argv;
9902 cmd_flag |= DO_NOFUNC;
9911 exitstatus = status;
9913 /* We have a redirection error. */
9915 raise_exception(EXERROR);
9920 /* Execute the command. */
9921 switch (cmdentry.cmdtype) {
9924 #if ENABLE_FEATURE_SH_NOFORK
9925 /* (1) BUG: if variables are set, we need to fork, or save/restore them
9926 * around run_nofork_applet() call.
9927 * (2) Should this check also be done in forkshell()?
9928 * (perhaps it should, so that "VAR=VAL nofork" at least avoids exec...)
9930 /* find_command() encodes applet_no as (-2 - applet_no) */
9931 int applet_no = (- cmdentry.u.index - 2);
9932 if (applet_no >= 0 && APPLET_IS_NOFORK(applet_no)) {
9933 listsetvar(varlist.list, VEXPORT|VSTACK);
9935 * Run <applet>_main().
9936 * Signals (^C) can't interrupt here.
9937 * Otherwise we can mangle stdio or malloc internal state.
9938 * This makes applets which can run for a long time
9939 * and/or wait for user input ineligible for NOFORK:
9940 * for example, "yes" or "rm" (rm -i waits for input).
9943 status = run_nofork_applet(applet_no, argv);
9945 * Try enabling NOFORK for "yes" applet.
9946 * ^C _will_ stop it (write returns EINTR),
9947 * but this causes stdout FILE to be stuck
9948 * and needing clearerr(). What if other applets
9949 * also can get EINTRs? Do we need to switch
9950 * our signals to SA_RESTART?
9952 /*clearerr(stdout);*/
9957 /* Can we avoid forking? For example, very last command
9958 * in a script or a subshell does not need forking,
9959 * we can just exec it.
9961 if (!(flags & EV_EXIT) || may_have_traps) {
9962 /* No, forking off a child is necessary */
9965 jp = makejob(/*cmd,*/ 1);
9966 if (forkshell(jp, cmd, FORK_FG) != 0) {
9968 status = waitforjob(jp);
9970 TRACE(("forked child exited with %d\n", status));
9975 /* fall through to exec'ing external program */
9977 listsetvar(varlist.list, VEXPORT|VSTACK);
9978 shellexec(argv[0], argv, path, cmdentry.u.index);
9982 if (spclbltin > 0 || argc == 0) {
9984 if (cmd_is_exec && argc > 1)
9985 listsetvar(varlist.list, VEXPORT);
9988 /* Tight loop with builtins only:
9989 * "while kill -0 $child; do true; done"
9990 * will never exit even if $child died, unless we do this
9991 * to reap the zombie and make kill detect that it's gone: */
9992 dowait(DOWAIT_NONBLOCK, NULL);
9994 if (evalbltin(cmdentry.u.cmd, argc, argv, flags)) {
9995 if (exception_type == EXERROR && spclbltin <= 0) {
10000 longjmp(exception_handler->loc, 1);
10006 /* See above for the rationale */
10007 dowait(DOWAIT_NONBLOCK, NULL);
10008 if (evalfun(cmdentry.u.func, argc, argv, flags))
10011 status = exitstatus;
10016 if (cmd->ncmd.redirect)
10017 popredir(/*drop:*/ cmd_is_exec);
10018 unwindredir(redir_stop);
10019 unwindlocalvars(localvar_stop);
10021 /* dsl: I think this is intended to be used to support
10022 * '_' in 'vi' command mode during line editing...
10023 * However I implemented that within libedit itself.
10025 setvar0("_", lastarg);
10027 popstackmark(&smark);
10033 evalbltin(const struct builtincmd *cmd, int argc, char **argv, int flags)
10035 char *volatile savecmdname;
10036 struct jmploc *volatile savehandler;
10037 struct jmploc jmploc;
10041 savecmdname = commandname;
10042 savehandler = exception_handler;
10043 i = setjmp(jmploc.loc);
10046 exception_handler = &jmploc;
10047 commandname = argv[0];
10049 optptr = NULL; /* initialize nextopt */
10050 if (cmd == EVALCMD)
10051 status = evalcmd(argc, argv, flags);
10053 status = (*cmd->builtin)(argc, argv);
10054 flush_stdout_stderr();
10055 status |= ferror(stdout);
10056 exitstatus = status;
10059 commandname = savecmdname;
10060 exception_handler = savehandler;
10066 goodname(const char *p)
10068 return endofname(p)[0] == '\0';
10073 * Search for a command. This is called before we fork so that the
10074 * location of the command will be available in the parent as well as
10075 * the child. The check for "goodname" is an overly conservative
10076 * check that the name will not be subject to expansion.
10079 prehash(union node *n)
10081 struct cmdentry entry;
10083 if (n->type == NCMD && n->ncmd.args && goodname(n->ncmd.args->narg.text))
10084 find_command(n->ncmd.args->narg.text, &entry, 0, pathval());
10088 /* ============ Builtin commands
10090 * Builtin commands whose functions are closely tied to evaluation
10091 * are implemented here.
10095 * Handle break and continue commands. Break, continue, and return are
10096 * all handled by setting the evalskip flag. The evaluation routines
10097 * above all check this flag, and if it is set they start skipping
10098 * commands rather than executing them. The variable skipcount is
10099 * the number of loops to break/continue, or the number of function
10100 * levels to return. (The latter is always 1.) It should probably
10101 * be an error to break out of more loops than exist, but it isn't
10102 * in the standard shell so we don't make it one here.
10104 static int FAST_FUNC
10105 breakcmd(int argc UNUSED_PARAM, char **argv)
10107 int n = argv[1] ? number(argv[1]) : 1;
10110 ash_msg_and_raise_error(msg_illnum, argv[1]);
10114 evalskip = (**argv == 'c') ? SKIPCONT : SKIPBREAK;
10122 * This implements the input routines used by the parser.
10126 INPUT_PUSH_FILE = 1,
10127 INPUT_NOFILE_OK = 2,
10130 static smallint checkkwd;
10131 /* values of checkkwd variable */
10132 #define CHKALIAS 0x1
10135 #define CHKEOFMARK 0x8
10138 * Push a string back onto the input at this current parsefile level.
10139 * We handle aliases this way.
10141 #if !ENABLE_ASH_ALIAS
10142 #define pushstring(s, ap) pushstring(s)
10145 pushstring(char *s, struct alias *ap)
10147 struct strpush *sp;
10152 if (g_parsefile->strpush) {
10153 sp = ckzalloc(sizeof(*sp));
10154 sp->prev = g_parsefile->strpush;
10156 sp = &(g_parsefile->basestrpush);
10158 g_parsefile->strpush = sp;
10159 sp->prev_string = g_parsefile->next_to_pgetc;
10160 sp->prev_left_in_line = g_parsefile->left_in_line;
10161 sp->unget = g_parsefile->unget;
10162 memcpy(sp->lastc, g_parsefile->lastc, sizeof(sp->lastc));
10163 #if ENABLE_ASH_ALIAS
10166 ap->flag |= ALIASINUSE;
10170 g_parsefile->next_to_pgetc = s;
10171 g_parsefile->left_in_line = len;
10172 g_parsefile->unget = 0;
10179 struct strpush *sp = g_parsefile->strpush;
10182 #if ENABLE_ASH_ALIAS
10184 if (g_parsefile->next_to_pgetc[-1] == ' '
10185 || g_parsefile->next_to_pgetc[-1] == '\t'
10187 checkkwd |= CHKALIAS;
10189 if (sp->string != sp->ap->val) {
10192 sp->ap->flag &= ~ALIASINUSE;
10193 if (sp->ap->flag & ALIASDEAD) {
10194 unalias(sp->ap->name);
10198 g_parsefile->next_to_pgetc = sp->prev_string;
10199 g_parsefile->left_in_line = sp->prev_left_in_line;
10200 g_parsefile->unget = sp->unget;
10201 memcpy(g_parsefile->lastc, sp->lastc, sizeof(sp->lastc));
10202 g_parsefile->strpush = sp->prev;
10203 if (sp != &(g_parsefile->basestrpush))
10212 char *buf = g_parsefile->buf;
10214 g_parsefile->next_to_pgetc = buf;
10215 #if ENABLE_FEATURE_EDITING
10217 if (!iflag || g_parsefile->pf_fd != STDIN_FILENO)
10218 nr = nonblock_immune_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1);
10220 # if ENABLE_ASH_IDLE_TIMEOUT
10223 const char *tmout_var = lookupvar("TMOUT");
10225 timeout = atoi(tmout_var) * 1000;
10230 line_input_state->timeout = timeout;
10232 # if ENABLE_FEATURE_TAB_COMPLETION
10233 line_input_state->path_lookup = pathval();
10235 reinit_unicode_for_ash();
10236 nr = read_line_input(line_input_state, cmdedit_prompt, buf, IBUFSIZ);
10238 /* ^C pressed, "convert" to SIGINT */
10239 write(STDOUT_FILENO, "^C", 2);
10240 if (trap[SIGINT]) {
10246 exitstatus = 128 + SIGINT;
10252 /* Ctrl+D pressed */
10255 # if ENABLE_ASH_IDLE_TIMEOUT
10256 else if (errno == EAGAIN && timeout > 0) {
10257 puts("\007timed out waiting for input: auto-logout");
10264 nr = nonblock_immune_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1);
10267 #if 0 /* disabled: nonblock_immune_read() handles this problem */
10269 if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
10270 int flags = fcntl(0, F_GETFL);
10271 if (flags >= 0 && (flags & O_NONBLOCK)) {
10272 flags &= ~O_NONBLOCK;
10273 if (fcntl(0, F_SETFL, flags) >= 0) {
10274 out2str("sh: turning off NDELAY mode\n");
10285 * Refill the input buffer and return the next input character:
10287 * 1) If a string was pushed back on the input, pop it;
10288 * 2) If an EOF was pushed back (g_parsefile->left_in_line < -BIGNUM)
10289 * or we are reading from a string so we can't refill the buffer,
10291 * 3) If there is more stuff in this buffer, use it else call read to fill it.
10292 * 4) Process input up to the next newline, deleting nul characters.
10294 //#define pgetc_debug(...) bb_error_msg(__VA_ARGS__)
10295 #define pgetc_debug(...) ((void)0)
10296 static int pgetc(void);
10303 if (g_parsefile->strpush) {
10304 #if ENABLE_ASH_ALIAS
10305 if (g_parsefile->left_in_line == -1
10306 && g_parsefile->strpush->ap
10307 && g_parsefile->next_to_pgetc[-1] != ' '
10308 && g_parsefile->next_to_pgetc[-1] != '\t'
10310 pgetc_debug("preadbuffer PEOA");
10317 /* on both branches above g_parsefile->left_in_line < 0.
10318 * "pgetc" needs refilling.
10321 /* -90 is our -BIGNUM. Below we use -99 to mark "EOF on read",
10322 * pungetc() may increment it a few times.
10323 * Assuming it won't increment it to less than -90.
10325 if (g_parsefile->left_in_line < -90 || g_parsefile->buf == NULL) {
10326 pgetc_debug("preadbuffer PEOF1");
10327 /* even in failure keep left_in_line and next_to_pgetc
10328 * in lock step, for correct multi-layer pungetc.
10329 * left_in_line was decremented before preadbuffer(),
10330 * must inc next_to_pgetc: */
10331 g_parsefile->next_to_pgetc++;
10335 more = g_parsefile->left_in_buffer;
10337 flush_stdout_stderr();
10341 /* don't try reading again */
10342 g_parsefile->left_in_line = -99;
10343 pgetc_debug("preadbuffer PEOF2");
10344 g_parsefile->next_to_pgetc++;
10349 /* Find out where's the end of line.
10350 * Set g_parsefile->left_in_line
10351 * and g_parsefile->left_in_buffer acordingly.
10352 * NUL chars are deleted.
10354 q = g_parsefile->next_to_pgetc;
10362 memmove(q, q + 1, more);
10366 g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1;
10372 g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1;
10373 if (g_parsefile->left_in_line < 0)
10378 g_parsefile->left_in_buffer = more;
10383 out2str(g_parsefile->next_to_pgetc);
10387 pgetc_debug("preadbuffer at %d:%p'%s'",
10388 g_parsefile->left_in_line,
10389 g_parsefile->next_to_pgetc,
10390 g_parsefile->next_to_pgetc);
10391 return (unsigned char)*g_parsefile->next_to_pgetc++;
10397 g_parsefile->linno++;
10398 setprompt_if(doprompt, 2);
10403 g_parsefile->linno++;
10404 needprompt = doprompt;
10412 pgetc_debug("pgetc at %d:%p'%s'",
10413 g_parsefile->left_in_line,
10414 g_parsefile->next_to_pgetc,
10415 g_parsefile->next_to_pgetc);
10416 if (g_parsefile->unget)
10417 return g_parsefile->lastc[--g_parsefile->unget];
10419 if (--g_parsefile->left_in_line >= 0)
10420 c = (unsigned char)*g_parsefile->next_to_pgetc++;
10424 g_parsefile->lastc[1] = g_parsefile->lastc[0];
10425 g_parsefile->lastc[0] = c;
10430 #if ENABLE_ASH_ALIAS
10432 pgetc_without_PEOA(void)
10436 pgetc_debug("pgetc at %d:%p'%s'",
10437 g_parsefile->left_in_line,
10438 g_parsefile->next_to_pgetc,
10439 g_parsefile->next_to_pgetc);
10441 } while (c == PEOA);
10445 # define pgetc_without_PEOA() pgetc()
10449 * Undo a call to pgetc. Only two characters may be pushed back.
10450 * PEOF may be pushed back.
10455 g_parsefile->unget++;
10458 /* This one eats backslash+newline */
10464 while ((c = pgetc()) == '\\') {
10465 if (pgetc() != '\n') {
10477 * To handle the "." command, a stack of input files is used. Pushfile
10478 * adds a new entry to the stack and popfile restores the previous level.
10483 struct parsefile *pf;
10485 pf = ckzalloc(sizeof(*pf));
10486 pf->prev = g_parsefile;
10488 /*pf->strpush = NULL; - ckzalloc did it */
10489 /*pf->basestrpush.prev = NULL;*/
10497 struct parsefile *pf = g_parsefile;
10503 if (pf->pf_fd >= 0)
10506 while (pf->strpush)
10508 g_parsefile = pf->prev;
10514 * Return to top level.
10519 while (g_parsefile != &basepf)
10524 * Close the file(s) that the shell is reading commands from. Called
10525 * after a fork is done.
10531 if (g_parsefile->pf_fd > 0) {
10532 close(g_parsefile->pf_fd);
10533 g_parsefile->pf_fd = 0;
10538 * Like setinputfile, but takes an open file descriptor. Call this with
10542 setinputfd(int fd, int push)
10546 g_parsefile->buf = NULL;
10548 g_parsefile->pf_fd = fd;
10549 if (g_parsefile->buf == NULL)
10550 g_parsefile->buf = ckmalloc(IBUFSIZ);
10551 g_parsefile->left_in_buffer = 0;
10552 g_parsefile->left_in_line = 0;
10553 g_parsefile->linno = 1;
10557 * Set the input to take input from a file. If push is set, push the
10558 * old input onto the stack first.
10561 setinputfile(const char *fname, int flags)
10566 fd = open(fname, O_RDONLY);
10568 if (flags & INPUT_NOFILE_OK)
10571 ash_msg_and_raise_perror("can't open '%s'", fname);
10576 close_on_exec_on(fd);
10577 setinputfd(fd, flags & INPUT_PUSH_FILE);
10584 * Like setinputfile, but takes input from a string.
10587 setinputstring(char *string)
10591 g_parsefile->next_to_pgetc = string;
10592 g_parsefile->left_in_line = strlen(string);
10593 g_parsefile->buf = NULL;
10594 g_parsefile->linno = 1;
10600 * Routines to check for mail.
10603 #if ENABLE_ASH_MAIL
10605 /* Hash of mtimes of mailboxes */
10606 static unsigned mailtime_hash;
10607 /* Set if MAIL or MAILPATH is changed. */
10608 static smallint mail_var_path_changed;
10611 * Print appropriate message(s) if mail has arrived.
10612 * If mail_var_path_changed is set,
10613 * then the value of MAIL has mail_var_path_changed,
10614 * so we just update the values.
10623 struct stackmark smark;
10626 setstackmark(&smark);
10627 mpath = mpathset() ? mpathval() : mailval();
10630 p = path_advance(&mpath, nullstr);
10635 for (q = p; *q; q++)
10641 q[-1] = '\0'; /* delete trailing '/' */
10642 if (stat(p, &statb) < 0) {
10645 /* Very simplistic "hash": just a sum of all mtimes */
10646 new_hash += (unsigned)statb.st_mtime;
10648 if (!mail_var_path_changed && mailtime_hash != new_hash) {
10649 if (mailtime_hash != 0)
10650 out2str("you have mail\n");
10651 mailtime_hash = new_hash;
10653 mail_var_path_changed = 0;
10654 popstackmark(&smark);
10657 static void FAST_FUNC
10658 changemail(const char *val UNUSED_PARAM)
10660 mail_var_path_changed = 1;
10663 #endif /* ASH_MAIL */
10666 /* ============ ??? */
10669 * Set the shell parameters.
10672 setparam(char **argv)
10678 for (nparam = 0; argv[nparam]; nparam++)
10680 ap = newparam = ckmalloc((nparam + 1) * sizeof(*ap));
10682 *ap++ = ckstrdup(*argv++);
10685 freeparam(&shellparam);
10686 shellparam.malloced = 1;
10687 shellparam.nparam = nparam;
10688 shellparam.p = newparam;
10689 #if ENABLE_ASH_GETOPTS
10690 shellparam.optind = 1;
10691 shellparam.optoff = -1;
10696 * Process shell options. The global variable argptr contains a pointer
10697 * to the argument list; we advance it past the options.
10699 * SUSv3 section 2.8.1 "Consequences of Shell Errors" says:
10700 * For a non-interactive shell, an error condition encountered
10701 * by a special built-in ... shall cause the shell to write a diagnostic message
10702 * to standard error and exit as shown in the following table:
10703 * Error Special Built-In
10705 * Utility syntax error (option or operand error) Shall exit
10707 * However, in bug 1142 (http://busybox.net/bugs/view.php?id=1142)
10708 * we see that bash does not do that (set "finishes" with error code 1 instead,
10709 * and shell continues), and people rely on this behavior!
10711 * set -o barfoo 2>/dev/null
10714 * Oh well. Let's mimic that.
10717 plus_minus_o(char *name, int val)
10722 for (i = 0; i < NOPTS; i++) {
10723 if (strcmp(name, optnames(i)) == 0) {
10728 ash_msg("illegal option %co %s", val ? '-' : '+', name);
10731 for (i = 0; i < NOPTS; i++) {
10733 out1fmt("%-16s%s\n", optnames(i), optlist[i] ? "on" : "off");
10735 out1fmt("set %co %s\n", optlist[i] ? '-' : '+', optnames(i));
10741 setoption(int flag, int val)
10745 for (i = 0; i < NOPTS; i++) {
10746 if (optletters(i) == flag) {
10751 ash_msg_and_raise_error("illegal option %c%c", val ? '-' : '+', flag);
10755 options(int cmdline, int *login_sh)
10763 while ((p = *argptr) != NULL) {
10765 if (c != '-' && c != '+')
10768 val = 0; /* val = 0 if c == '+' */
10771 if (p[0] == '\0' || LONE_DASH(p)) {
10773 /* "-" means turn off -x and -v */
10776 /* "--" means reset params */
10777 else if (*argptr == NULL)
10780 break; /* "-" or "--" terminates options */
10783 /* first char was + or - */
10784 while ((c = *p++) != '\0') {
10785 /* bash 3.2 indeed handles -c CMD and +c CMD the same */
10786 if (c == 'c' && cmdline) {
10787 minusc = p; /* command is after shell args */
10788 } else if (c == 'o') {
10789 if (plus_minus_o(*argptr, val)) {
10790 /* it already printed err message */
10791 return 1; /* error */
10795 } else if (cmdline && (c == 'l')) { /* -l or +l == --login */
10798 /* bash does not accept +-login, we also won't */
10799 } else if (cmdline && val && (c == '-')) { /* long options */
10800 if (strcmp(p, "login") == 0) {
10814 * The shift builtin command.
10816 static int FAST_FUNC
10817 shiftcmd(int argc UNUSED_PARAM, char **argv)
10824 n = number(argv[1]);
10825 if (n > shellparam.nparam)
10826 n = 0; /* bash compat, was = shellparam.nparam; */
10828 shellparam.nparam -= n;
10829 for (ap1 = shellparam.p; --n >= 0; ap1++) {
10830 if (shellparam.malloced)
10833 ap2 = shellparam.p;
10834 while ((*ap2++ = *ap1++) != NULL)
10836 #if ENABLE_ASH_GETOPTS
10837 shellparam.optind = 1;
10838 shellparam.optoff = -1;
10845 * POSIX requires that 'set' (but not export or readonly) output the
10846 * variables in lexicographic order - by the locale's collating order (sigh).
10847 * Maybe we could keep them in an ordered balanced binary tree
10848 * instead of hashed lists.
10849 * For now just roll 'em through qsort for printing...
10852 showvars(const char *sep_prefix, int on, int off)
10855 char **ep, **epend;
10857 ep = listvars(on, off, &epend);
10858 qsort(ep, epend - ep, sizeof(char *), vpcmp);
10860 sep = *sep_prefix ? " " : sep_prefix;
10862 for (; ep < epend; ep++) {
10866 p = strchrnul(*ep, '=');
10869 q = single_quote(++p);
10870 out1fmt("%s%s%.*s%s\n", sep_prefix, sep, (int)(p - *ep), *ep, q);
10876 * The set command builtin.
10878 static int FAST_FUNC
10879 setcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
10884 return showvars(nullstr, 0, VUNSET);
10887 retval = options(/*cmdline:*/ 0, NULL);
10888 if (retval == 0) { /* if no parse error... */
10890 if (*argptr != NULL) {
10898 #if ENABLE_ASH_RANDOM_SUPPORT
10899 static void FAST_FUNC
10900 change_random(const char *value)
10904 if (value == NULL) {
10905 /* "get", generate */
10906 t = next_random(&random_gen);
10907 /* set without recursion */
10908 setvar(vrandom.var_text, utoa(t), VNOFUNC);
10909 vrandom.flags &= ~VNOFUNC;
10912 t = strtoul(value, NULL, 10);
10913 INIT_RANDOM_T(&random_gen, (t ? t : 1), t);
10918 #if ENABLE_ASH_GETOPTS
10920 getopts(char *optstr, char *optvar, char **optfirst)
10927 int ind = shellparam.optind;
10928 int off = shellparam.optoff;
10932 shellparam.optind = -1;
10933 optnext = optfirst + ind - 1;
10935 if (ind <= 1 || off < 0 || (int)strlen(optnext[-1]) < off)
10938 p = optnext[-1] + off;
10939 if (p == NULL || *p == '\0') {
10940 /* Current word is done, advance */
10942 if (p == NULL || *p != '-' || *++p == '\0') {
10944 unsetvar("OPTARG");
10950 if (LONE_DASH(p)) /* check for "--" */
10955 for (q = optstr; *q != c;) {
10957 /* OPTERR is a bashism */
10958 const char *cp = lookupvar("OPTERR");
10959 if ((cp && LONE_CHAR(cp, '0'))
10960 || (optstr[0] == ':')
10963 /*sbuf[1] = '\0'; - already is */
10964 setvar0("OPTARG", sbuf);
10966 fprintf(stderr, "Illegal option -%c\n", c);
10967 unsetvar("OPTARG");
10977 if (*p == '\0' && (p = *optnext) == NULL) {
10978 /* OPTERR is a bashism */
10979 const char *cp = lookupvar("OPTERR");
10980 if ((cp && LONE_CHAR(cp, '0'))
10981 || (optstr[0] == ':')
10984 /*sbuf[1] = '\0'; - already is */
10985 setvar0("OPTARG", sbuf);
10988 fprintf(stderr, "No arg for -%c option\n", c);
10989 unsetvar("OPTARG");
10997 setvar0("OPTARG", p);
11000 setvar0("OPTARG", nullstr);
11002 ind = optnext - optfirst + 1;
11003 setvar("OPTIND", itoa(ind), VNOFUNC);
11005 /*sbuf[1] = '\0'; - already is */
11006 setvar0(optvar, sbuf);
11008 shellparam.optoff = p ? p - *(optnext - 1) : -1;
11009 shellparam.optind = ind;
11015 * The getopts builtin. Shellparam.optnext points to the next argument
11016 * to be processed. Shellparam.optptr points to the next character to
11017 * be processed in the current argument. If shellparam.optnext is NULL,
11018 * then it's the first time getopts has been called.
11020 static int FAST_FUNC
11021 getoptscmd(int argc, char **argv)
11026 ash_msg_and_raise_error("usage: getopts optstring var [arg]");
11028 optbase = shellparam.p;
11029 if ((unsigned)shellparam.optind > shellparam.nparam + 1) {
11030 shellparam.optind = 1;
11031 shellparam.optoff = -1;
11034 optbase = &argv[3];
11035 if ((unsigned)shellparam.optind > argc - 2) {
11036 shellparam.optind = 1;
11037 shellparam.optoff = -1;
11041 return getopts(argv[1], argv[2], optbase);
11043 #endif /* ASH_GETOPTS */
11046 /* ============ Shell parser */
11049 struct heredoc *next; /* next here document in list */
11050 union node *here; /* redirection node */
11051 char *eofmark; /* string indicating end of input */
11052 smallint striptabs; /* if set, strip leading tabs */
11055 static smallint tokpushback; /* last token pushed back */
11056 static smallint quoteflag; /* set if (part of) last token was quoted */
11057 static token_id_t lasttoken; /* last token read (integer id Txxx) */
11058 static struct heredoc *heredoclist; /* list of here documents to read */
11059 static char *wordtext; /* text of last word returned by readtoken */
11060 static struct nodelist *backquotelist;
11061 static union node *redirnode;
11062 static struct heredoc *heredoc;
11064 static const char *
11065 tokname(char *buf, int tok)
11068 return tokname_array[tok];
11069 sprintf(buf, "\"%s\"", tokname_array[tok]);
11073 /* raise_error_unexpected_syntax:
11074 * Called when an unexpected token is read during the parse. The argument
11075 * is the token that is expected, or -1 if more than one type of token can
11076 * occur at this point.
11078 static void raise_error_unexpected_syntax(int) NORETURN;
11080 raise_error_unexpected_syntax(int token)
11086 l = sprintf(msg, "unexpected %s", tokname(buf, lasttoken));
11088 sprintf(msg + l, " (expecting %s)", tokname(buf, token));
11089 raise_error_syntax(msg);
11093 /* parsing is heavily cross-recursive, need these forward decls */
11094 static union node *andor(void);
11095 static union node *pipeline(void);
11096 static union node *parse_command(void);
11097 static void parseheredoc(void);
11098 static int peektoken(void);
11099 static int readtoken(void);
11101 static union node *
11104 union node *n1, *n2, *n3;
11109 switch (peektoken()) {
11117 if (!n1 && (nlflag & 1))
11123 checkkwd = CHKNL | CHKKWD | CHKALIAS;
11124 if (nlflag == 2 && ((1 << peektoken()) & tokendlist))
11130 if (tok == TBACKGND) {
11131 if (n2->type == NPIPE) {
11132 n2->npipe.pipe_backgnd = 1;
11134 if (n2->type != NREDIR) {
11135 n3 = stzalloc(sizeof(struct nredir));
11137 /*n3->nredir.redirect = NULL; - stzalloc did it */
11140 n2->type = NBACKGND;
11146 n3 = stzalloc(sizeof(struct nbinary));
11148 n3->nbinary.ch1 = n1;
11149 n3->nbinary.ch2 = n2;
11162 raise_error_unexpected_syntax(-1);
11169 static union node *
11172 union node *n1, *n2, *n3;
11180 } else if (t == TOR) {
11186 checkkwd = CHKNL | CHKKWD | CHKALIAS;
11188 n3 = stzalloc(sizeof(struct nbinary));
11190 n3->nbinary.ch1 = n1;
11191 n3->nbinary.ch2 = n2;
11196 static union node *
11199 union node *n1, *n2, *pipenode;
11200 struct nodelist *lp, *prev;
11204 TRACE(("pipeline: entered\n"));
11205 if (readtoken() == TNOT) {
11207 checkkwd = CHKKWD | CHKALIAS;
11210 n1 = parse_command();
11211 if (readtoken() == TPIPE) {
11212 pipenode = stzalloc(sizeof(struct npipe));
11213 pipenode->type = NPIPE;
11214 /*pipenode->npipe.pipe_backgnd = 0; - stzalloc did it */
11215 lp = stzalloc(sizeof(struct nodelist));
11216 pipenode->npipe.cmdlist = lp;
11220 lp = stzalloc(sizeof(struct nodelist));
11221 checkkwd = CHKNL | CHKKWD | CHKALIAS;
11222 lp->n = parse_command();
11224 } while (readtoken() == TPIPE);
11230 n2 = stzalloc(sizeof(struct nnot));
11238 static union node *
11243 n = stzalloc(sizeof(struct narg));
11245 /*n->narg.next = NULL; - stzalloc did it */
11246 n->narg.text = wordtext;
11247 n->narg.backquote = backquotelist;
11252 fixredir(union node *n, const char *text, int err)
11256 TRACE(("Fix redir %s %d\n", text, err));
11258 n->ndup.vname = NULL;
11260 fd = bb_strtou(text, NULL, 10);
11261 if (!errno && fd >= 0)
11262 n->ndup.dupfd = fd;
11263 else if (LONE_DASH(text))
11264 n->ndup.dupfd = -1;
11267 raise_error_syntax("bad fd number");
11268 n->ndup.vname = makename();
11275 union node *n = redirnode;
11277 if (n->type == NHERE)
11278 checkkwd = CHKEOFMARK;
11279 if (readtoken() != TWORD)
11280 raise_error_unexpected_syntax(-1);
11281 if (n->type == NHERE) {
11282 struct heredoc *here = heredoc;
11285 if (quoteflag == 0)
11287 TRACE(("Here document %d\n", n->type));
11288 rmescapes(wordtext, 0);
11289 here->eofmark = wordtext;
11291 if (heredoclist == NULL)
11292 heredoclist = here;
11294 for (p = heredoclist; p->next; p = p->next)
11298 } else if (n->type == NTOFD || n->type == NFROMFD) {
11299 fixredir(n, wordtext, 0);
11301 n->nfile.fname = makename();
11305 static union node *
11308 union node *args, **app;
11309 union node *n = NULL;
11310 union node *vars, **vpp;
11311 union node **rpp, *redir;
11314 smallint double_brackets_flag = 0;
11316 IF_BASH_FUNCTION(smallint function_flag = 0;)
11325 savecheckkwd = CHKALIAS;
11328 checkkwd = savecheckkwd;
11333 if (peektoken() != TWORD)
11334 raise_error_unexpected_syntax(TWORD);
11339 case TAND: /* "&&" */
11340 case TOR: /* "||" */
11341 if (!double_brackets_flag) {
11345 wordtext = (char *) (t == TAND ? "-a" : "-o");
11348 n = stzalloc(sizeof(struct narg));
11350 /*n->narg.next = NULL; - stzalloc did it */
11351 n->narg.text = wordtext;
11353 if (strcmp("[[", wordtext) == 0)
11354 double_brackets_flag = 1;
11355 else if (strcmp("]]", wordtext) == 0)
11356 double_brackets_flag = 0;
11358 n->narg.backquote = backquotelist;
11359 if (savecheckkwd && isassignment(wordtext)) {
11361 vpp = &n->narg.next;
11364 app = &n->narg.next;
11368 if (function_flag) {
11369 checkkwd = CHKNL | CHKKWD;
11370 switch (peektoken()) {
11382 if (strcmp("[[", wordtext) == 0)
11386 raise_error_unexpected_syntax(-1);
11392 *rpp = n = redirnode;
11393 rpp = &n->nfile.next;
11394 parsefname(); /* read name of redirection file */
11397 IF_BASH_FUNCTION(do_func:)
11398 if (args && app == &args->narg.next
11401 struct builtincmd *bcmd;
11404 /* We have a function */
11405 if (IF_BASH_FUNCTION(!function_flag &&) readtoken() != TRP)
11406 raise_error_unexpected_syntax(TRP);
11407 name = n->narg.text;
11408 if (!goodname(name)
11409 || ((bcmd = find_builtin(name)) && IS_BUILTIN_SPECIAL(bcmd))
11411 raise_error_syntax("bad function name");
11414 checkkwd = CHKNL | CHKKWD | CHKALIAS;
11415 n->narg.next = parse_command();
11418 IF_BASH_FUNCTION(function_flag = 0;)
11429 n = stzalloc(sizeof(struct ncmd));
11431 n->ncmd.args = args;
11432 n->ncmd.assign = vars;
11433 n->ncmd.redirect = redir;
11437 static union node *
11438 parse_command(void)
11440 union node *n1, *n2;
11441 union node *ap, **app;
11442 union node *cp, **cpp;
11443 union node *redir, **rpp;
11450 switch (readtoken()) {
11452 raise_error_unexpected_syntax(-1);
11455 n1 = stzalloc(sizeof(struct nif));
11457 n1->nif.test = list(0);
11458 if (readtoken() != TTHEN)
11459 raise_error_unexpected_syntax(TTHEN);
11460 n1->nif.ifpart = list(0);
11462 while (readtoken() == TELIF) {
11463 n2->nif.elsepart = stzalloc(sizeof(struct nif));
11464 n2 = n2->nif.elsepart;
11466 n2->nif.test = list(0);
11467 if (readtoken() != TTHEN)
11468 raise_error_unexpected_syntax(TTHEN);
11469 n2->nif.ifpart = list(0);
11471 if (lasttoken == TELSE)
11472 n2->nif.elsepart = list(0);
11474 n2->nif.elsepart = NULL;
11482 n1 = stzalloc(sizeof(struct nbinary));
11483 n1->type = (lasttoken == TWHILE) ? NWHILE : NUNTIL;
11484 n1->nbinary.ch1 = list(0);
11487 TRACE(("expecting DO got '%s' %s\n", tokname_array[got],
11488 got == TWORD ? wordtext : ""));
11489 raise_error_unexpected_syntax(TDO);
11491 n1->nbinary.ch2 = list(0);
11496 if (readtoken() != TWORD || quoteflag || !goodname(wordtext))
11497 raise_error_syntax("bad for loop variable");
11498 n1 = stzalloc(sizeof(struct nfor));
11500 n1->nfor.var = wordtext;
11501 checkkwd = CHKNL | CHKKWD | CHKALIAS;
11502 if (readtoken() == TIN) {
11504 while (readtoken() == TWORD) {
11505 n2 = stzalloc(sizeof(struct narg));
11507 /*n2->narg.next = NULL; - stzalloc did it */
11508 n2->narg.text = wordtext;
11509 n2->narg.backquote = backquotelist;
11511 app = &n2->narg.next;
11514 n1->nfor.args = ap;
11515 if (lasttoken != TNL && lasttoken != TSEMI)
11516 raise_error_unexpected_syntax(-1);
11518 n2 = stzalloc(sizeof(struct narg));
11520 /*n2->narg.next = NULL; - stzalloc did it */
11521 n2->narg.text = (char *)dolatstr;
11522 /*n2->narg.backquote = NULL;*/
11523 n1->nfor.args = n2;
11525 * Newline or semicolon here is optional (but note
11526 * that the original Bourne shell only allowed NL).
11528 if (lasttoken != TSEMI)
11531 checkkwd = CHKNL | CHKKWD | CHKALIAS;
11532 if (readtoken() != TDO)
11533 raise_error_unexpected_syntax(TDO);
11534 n1->nfor.body = list(0);
11538 n1 = stzalloc(sizeof(struct ncase));
11540 if (readtoken() != TWORD)
11541 raise_error_unexpected_syntax(TWORD);
11542 n1->ncase.expr = n2 = stzalloc(sizeof(struct narg));
11544 /*n2->narg.next = NULL; - stzalloc did it */
11545 n2->narg.text = wordtext;
11546 n2->narg.backquote = backquotelist;
11547 checkkwd = CHKNL | CHKKWD | CHKALIAS;
11548 if (readtoken() != TIN)
11549 raise_error_unexpected_syntax(TIN);
11550 cpp = &n1->ncase.cases;
11552 checkkwd = CHKNL | CHKKWD;
11554 while (t != TESAC) {
11555 if (lasttoken == TLP)
11557 *cpp = cp = stzalloc(sizeof(struct nclist));
11559 app = &cp->nclist.pattern;
11561 *app = ap = stzalloc(sizeof(struct narg));
11563 /*ap->narg.next = NULL; - stzalloc did it */
11564 ap->narg.text = wordtext;
11565 ap->narg.backquote = backquotelist;
11566 if (readtoken() != TPIPE)
11568 app = &ap->narg.next;
11571 //ap->narg.next = NULL;
11572 if (lasttoken != TRP)
11573 raise_error_unexpected_syntax(TRP);
11574 cp->nclist.body = list(2);
11576 cpp = &cp->nclist.next;
11578 checkkwd = CHKNL | CHKKWD;
11582 raise_error_unexpected_syntax(TENDCASE);
11589 n1 = stzalloc(sizeof(struct nredir));
11590 n1->type = NSUBSHELL;
11591 n1->nredir.n = list(0);
11592 /*n1->nredir.redirect = NULL; - stzalloc did it */
11599 IF_BASH_FUNCTION(case TFUNCTION:)
11603 return simplecmd();
11606 if (readtoken() != t)
11607 raise_error_unexpected_syntax(t);
11610 /* Now check for redirection which may follow command */
11611 checkkwd = CHKKWD | CHKALIAS;
11613 while (readtoken() == TREDIR) {
11614 *rpp = n2 = redirnode;
11615 rpp = &n2->nfile.next;
11621 if (n1->type != NSUBSHELL) {
11622 n2 = stzalloc(sizeof(struct nredir));
11627 n1->nredir.redirect = redir;
11632 #if BASH_DOLLAR_SQUOTE
11634 decode_dollar_squote(void)
11636 static const char C_escapes[] ALIGN1 = "nrbtfav""x\\01234567";
11642 p = strchr(C_escapes, c);
11647 if ((unsigned char)(c - '0') <= 7) { /* \ooo */
11651 } while ((unsigned char)(c - '0') <= 7 && --cnt);
11653 } else if (c == 'x') { /* \xHH */
11657 } while (isxdigit(c) && --cnt);
11659 if (cnt == 3) { /* \x but next char is "bad" */
11663 } else { /* simple seq like \\ or \t */
11668 c = bb_process_escape_sequence((void*)&p);
11669 } else { /* unrecognized "\z": print both chars unless ' or " */
11670 if (c != '\'' && c != '"') {
11672 c |= 0x100; /* "please encode \, then me" */
11679 /* Used by expandstr to get here-doc like behaviour. */
11680 #define FAKEEOFMARK ((char*)(uintptr_t)1)
11682 static ALWAYS_INLINE int
11683 realeofmark(const char *eofmark)
11685 return eofmark && eofmark != FAKEEOFMARK;
11689 * If eofmark is NULL, read a word or a redirection symbol. If eofmark
11690 * is not NULL, read a here document. In the latter case, eofmark is the
11691 * word which marks the end of the document and striptabs is true if
11692 * leading tabs should be stripped from the document. The argument c
11693 * is the first character of the input token or document.
11695 * Because C does not have internal subroutines, I have simulated them
11696 * using goto's to implement the subroutine linkage. The following macros
11697 * will run code that appears at the end of readtoken1.
11699 #define CHECKEND() {goto checkend; checkend_return:;}
11700 #define PARSEREDIR() {goto parseredir; parseredir_return:;}
11701 #define PARSESUB() {goto parsesub; parsesub_return:;}
11702 #define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;}
11703 #define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;}
11704 #define PARSEARITH() {goto parsearith; parsearith_return:;}
11706 readtoken1(int c, int syntax, char *eofmark, int striptabs)
11708 /* NB: syntax parameter fits into smallint */
11709 /* c parameter is an unsigned char or PEOF or PEOA */
11712 struct nodelist *bqlist;
11716 IF_FEATURE_SH_MATH(smallint prevsyntax;) /* syntax before arithmetic */
11717 smallint pssyntax; /* we are expanding a prompt string */
11718 int varnest; /* levels of variables expansion */
11719 IF_FEATURE_SH_MATH(int arinest;) /* levels of arithmetic expansion */
11720 IF_FEATURE_SH_MATH(int parenlevel;) /* levels of parens in arithmetic */
11721 int dqvarnest; /* levels of variables expansion within double quotes */
11723 IF_BASH_DOLLAR_SQUOTE(smallint bash_dollar_squote = 0;)
11725 startlinno = g_parsefile->linno;
11728 IF_FEATURE_SH_MATH(prevsyntax = 0;)
11729 #if ENABLE_ASH_EXPAND_PRMT
11730 pssyntax = (syntax == PSSYNTAX);
11734 pssyntax = 0; /* constant */
11736 dblquote = (syntax == DQSYNTAX);
11738 IF_FEATURE_SH_MATH(arinest = 0;)
11739 IF_FEATURE_SH_MATH(parenlevel = 0;)
11742 STARTSTACKSTR(out);
11744 /* For each line, until end of word */
11745 CHECKEND(); /* set c to PEOF if at end of here document */
11746 for (;;) { /* until end of line or end of word */
11747 CHECKSTRSPACE(4, out); /* permit 4 calls to USTPUTC */
11748 switch (SIT(c, syntax)) {
11749 case CNL: /* '\n' */
11750 if (syntax == BASESYNTAX)
11751 goto endword; /* exit outer loop */
11755 goto loop; /* continue outer loop */
11760 #if BASH_DOLLAR_SQUOTE
11761 if (c == '\\' && bash_dollar_squote) {
11762 c = decode_dollar_squote();
11764 /* skip $'\000', $'\x00' (like bash) */
11768 /* Unknown escape. Encode as '\z' */
11769 c = (unsigned char)c;
11770 if (eofmark == NULL || dblquote)
11771 USTPUTC(CTLESC, out);
11772 USTPUTC('\\', out);
11776 if (eofmark == NULL || dblquote)
11777 USTPUTC(CTLESC, out);
11780 case CBACK: /* backslash */
11781 c = pgetc_without_PEOA();
11783 USTPUTC(CTLESC, out);
11784 USTPUTC('\\', out);
11786 } else if (c == '\n') {
11789 if (pssyntax && c == '$') {
11790 USTPUTC(CTLESC, out);
11791 USTPUTC('\\', out);
11793 /* Backslash is retained if we are in "str" and next char isn't special */
11798 && (c != '"' || eofmark != NULL)
11800 USTPUTC('\\', out);
11802 USTPUTC(CTLESC, out);
11810 if (eofmark == NULL) {
11811 USTPUTC(CTLQUOTEMARK, out);
11819 IF_BASH_DOLLAR_SQUOTE(bash_dollar_squote = 0;)
11820 if (eofmark != NULL && varnest == 0) {
11823 if (dqvarnest == 0) {
11824 syntax = BASESYNTAX;
11831 case CVAR: /* '$' */
11832 PARSESUB(); /* parse substitution */
11834 case CENDVAR: /* '}' */
11837 if (dqvarnest > 0) {
11844 #if ENABLE_FEATURE_SH_MATH
11845 case CLP: /* '(' in arithmetic */
11849 case CRP: /* ')' in arithmetic */
11850 if (parenlevel > 0) {
11853 if (pgetc_eatbnl() == ')') {
11855 if (--arinest == 0) {
11856 syntax = prevsyntax;
11860 * unbalanced parens
11861 * (don't 2nd guess - no error)
11869 case CBQUOTE: /* '`' */
11873 goto endword; /* exit outer loop */
11877 if (varnest == 0) {
11878 #if BASH_REDIR_OUTPUT
11880 //Can't call pgetc_eatbnl() here, this requires three-deep pungetc()
11881 if (pgetc() == '>')
11882 c = 0x100 + '>'; /* flag &> */
11886 goto endword; /* exit outer loop */
11888 IF_ASH_ALIAS(if (c != PEOA))
11895 #if ENABLE_FEATURE_SH_MATH
11896 if (syntax == ARISYNTAX)
11897 raise_error_syntax("missing '))'");
11899 if (syntax != BASESYNTAX && eofmark == NULL)
11900 raise_error_syntax("unterminated quoted string");
11901 if (varnest != 0) {
11902 startlinno = g_parsefile->linno;
11904 raise_error_syntax("missing '}'");
11906 USTPUTC('\0', out);
11907 len = out - (char *)stackblock();
11908 out = stackblock();
11909 if (eofmark == NULL) {
11910 if ((c == '>' || c == '<' IF_BASH_REDIR_OUTPUT( || c == 0x100 + '>'))
11913 if (isdigit_str9(out)) {
11914 PARSEREDIR(); /* passed as params: out, c */
11915 lasttoken = TREDIR;
11918 /* else: non-number X seen, interpret it
11919 * as "NNNX>file" = "NNNX >file" */
11923 quoteflag = quotef;
11924 backquotelist = bqlist;
11925 grabstackblock(len);
11929 /* end of readtoken routine */
11932 * Check to see whether we are at the end of the here document. When this
11933 * is called, c is set to the first character of the next input line. If
11934 * we are at the end of the here document, this routine sets the c to PEOF.
11937 if (realeofmark(eofmark)) {
11941 #if ENABLE_ASH_ALIAS
11943 c = pgetc_without_PEOA();
11946 while (c == '\t') {
11947 c = pgetc_without_PEOA();
11951 markloc = out - (char *)stackblock();
11952 for (p = eofmark; STPUTC(c, out), *p; p++) {
11956 c = pgetc_without_PEOA();
11959 if (c == '\n' || c == PEOF) {
11961 g_parsefile->linno++;
11962 needprompt = doprompt;
11967 p = (char *)stackblock() + markloc + 1;
11968 len_here = out - p;
11971 len_here -= (c >= PEOF);
11977 str = alloca(len_here + 1);
11978 *(char *)mempcpy(str, p, len_here) = '\0';
11980 pushstring(str, NULL);
11985 STADJUST((char *)stackblock() + markloc - out, out);
11987 goto checkend_return;
11991 * Parse a redirection operator. The variable "out" points to a string
11992 * specifying the fd to be redirected. The variable "c" contains the
11993 * first character of the redirection operator.
11996 /* out is already checked to be a valid number or "" */
11997 int fd = (*out == '\0' ? -1 : atoi(out));
12000 np = stzalloc(sizeof(struct nfile));
12005 np->type = NAPPEND;
12007 np->type = NCLOBBER;
12010 /* it also can be NTO2 (>&file), but we can't figure it out yet */
12016 #if BASH_REDIR_OUTPUT
12017 else if (c == 0x100 + '>') { /* this flags &> redirection */
12019 pgetc(); /* this is '>', no need to check */
12023 else { /* c == '<' */
12024 /*np->nfile.fd = 0; - stzalloc did it */
12028 if (sizeof(struct nfile) != sizeof(struct nhere)) {
12029 np = stzalloc(sizeof(struct nhere));
12030 /*np->nfile.fd = 0; - stzalloc did it */
12033 heredoc = stzalloc(sizeof(struct heredoc));
12034 heredoc->here = np;
12037 heredoc->striptabs = 1;
12039 /*heredoc->striptabs = 0; - stzalloc did it */
12045 np->type = NFROMFD;
12049 np->type = NFROMTO;
12061 goto parseredir_return;
12065 * Parse a substitution. At this point, we have read the dollar sign
12066 * and nothing else.
12069 /* is_special(c) evaluates to 1 for c in "!#$*-0123456789?@"; 0 otherwise
12070 * (assuming ascii char codes, as the original implementation did) */
12071 #define is_special(c) \
12072 (((unsigned)(c) - 33 < 32) \
12073 && ((0xc1ff920dU >> ((unsigned)(c) - 33)) & 1))
12075 unsigned char subtype;
12078 c = pgetc_eatbnl();
12079 if ((checkkwd & CHKEOFMARK)
12080 || c > 255 /* PEOA or PEOF */
12081 || (c != '(' && c != '{' && !is_name(c) && !is_special(c))
12083 #if BASH_DOLLAR_SQUOTE
12084 if (syntax != DQSYNTAX && c == '\'')
12085 bash_dollar_squote = 1;
12090 } else if (c == '(') {
12091 /* $(command) or $((arith)) */
12092 if (pgetc_eatbnl() == '(') {
12093 #if ENABLE_FEATURE_SH_MATH
12096 raise_error_syntax("support for $((arith)) is disabled");
12103 /* $VAR, $<specialchar>, ${...}, or PEOA/PEOF */
12104 USTPUTC(CTLVAR, out);
12105 typeloc = out - (char *)stackblock();
12107 subtype = VSNORMAL;
12109 c = pgetc_eatbnl();
12114 /* $[{[#]]NAME[}] */
12117 c = pgetc_eatbnl();
12118 } while (is_in_name(c));
12119 } else if (isdigit(c)) {
12120 /* $[{[#]]NUM[}] */
12123 c = pgetc_eatbnl();
12124 } while (isdigit(c));
12126 /* $[{[#]]<specialchar>[}] */
12129 c = pgetc_eatbnl();
12130 if (!subtype && cc == '#') {
12131 subtype = VSLENGTH;
12132 if (c == '_' || isalnum(c))
12135 c = pgetc_eatbnl();
12136 if (cc == '}' || c != '}') {
12144 if (!is_special(cc)) {
12145 if (subtype == VSLENGTH)
12153 if (c != '}' && subtype == VSLENGTH) {
12154 /* ${#VAR didn't end with } */
12158 if (subtype == 0) {
12159 static const char types[] ALIGN1 = "}-+?=";
12160 /* ${VAR...} but not $VAR or ${#VAR} */
12161 /* c == first char after VAR */
12164 c = pgetc_eatbnl();
12166 /* This check is only needed to not misinterpret
12167 * ${VAR:-WORD}, ${VAR:+WORD}, ${VAR:=WORD}, ${VAR:?WORD}
12170 if (!strchr(types, c)) {
12171 subtype = VSSUBSTR;
12173 break; /* "goto badsub" is bigger (!) */
12179 const char *p = strchr(types, c);
12182 subtype |= p - types + VSNORMAL;
12188 subtype = (c == '#' ? VSTRIMLEFT : VSTRIMRIGHT);
12189 c = pgetc_eatbnl();
12195 #if BASH_PATTERN_SUBST
12197 /* ${v/[/]pattern/repl} */
12198 //TODO: encode pattern and repl separately.
12199 // Currently ${v/$var_with_slash/repl} is horribly broken
12200 subtype = VSREPLACE;
12201 c = pgetc_eatbnl();
12204 subtype++; /* VSREPLACEALL */
12212 ((unsigned char *)stackblock())[typeloc] = subtype;
12213 if (subtype != VSNORMAL) {
12220 goto parsesub_return;
12224 * Called to parse command substitutions. Newstyle is set if the command
12225 * is enclosed inside $(...); nlpp is a pointer to the head of the linked
12226 * list of commands (passed by reference), and savelen is the number of
12227 * characters on the top of the stack which must be preserved.
12230 struct nodelist **nlpp;
12234 smallint saveprompt = 0;
12237 savelen = out - (char *)stackblock();
12240 * FIXME: this can allocate very large block on stack and SEGV.
12242 * echo "..<100kbytes>..`true` $(true) `true` ..."
12243 * allocates 100kb for every command subst. With about
12244 * a hundred command substitutions stack overflows.
12245 * With larger prepended string, SEGV happens sooner.
12247 str = alloca(savelen);
12248 memcpy(str, stackblock(), savelen);
12252 /* We must read until the closing backquote, giving special
12253 * treatment to some slashes, and then push the string and
12254 * reread it as input, interpreting it normally.
12260 STARTSTACKSTR(pout);
12264 setprompt_if(needprompt, 2);
12275 * If eating a newline, avoid putting
12276 * the newline into the new character
12277 * stream (via the STPUTC after the
12282 if (pc != '\\' && pc != '`' && pc != '$'
12283 && (!dblquote || pc != '"')
12285 STPUTC('\\', pout);
12287 if (pc <= 255 /* not PEOA or PEOF */) {
12293 IF_ASH_ALIAS(case PEOA:)
12294 startlinno = g_parsefile->linno;
12295 raise_error_syntax("EOF in backquote substitution");
12307 STPUTC('\0', pout);
12308 psavelen = pout - (char *)stackblock();
12309 if (psavelen > 0) {
12310 pstr = grabstackstr(pout);
12311 setinputstring(pstr);
12316 nlpp = &(*nlpp)->next;
12317 *nlpp = stzalloc(sizeof(**nlpp));
12318 /* (*nlpp)->next = NULL; - stzalloc did it */
12321 saveprompt = doprompt;
12328 doprompt = saveprompt;
12329 else if (readtoken() != TRP)
12330 raise_error_unexpected_syntax(TRP);
12335 * Start reading from old file again, ignoring any pushed back
12336 * tokens left from the backquote parsing
12341 while (stackblocksize() <= savelen)
12343 STARTSTACKSTR(out);
12345 memcpy(out, str, savelen);
12346 STADJUST(savelen, out);
12348 USTPUTC(CTLBACKQ, out);
12350 goto parsebackq_oldreturn;
12351 goto parsebackq_newreturn;
12354 #if ENABLE_FEATURE_SH_MATH
12356 * Parse an arithmetic expansion (indicate start of one and set state)
12359 if (++arinest == 1) {
12360 prevsyntax = syntax;
12361 syntax = ARISYNTAX;
12363 USTPUTC(CTLARI, out);
12364 goto parsearith_return;
12367 } /* end of readtoken */
12370 * Read the next input token.
12371 * If the token is a word, we set backquotelist to the list of cmds in
12372 * backquotes. We set quoteflag to true if any part of the word was
12374 * If the token is TREDIR, then we set redirnode to a structure containing
12376 * In all cases, the variable startlinno is set to the number of the line
12377 * on which the token starts.
12379 * [Change comment: here documents and internal procedures]
12380 * [Readtoken shouldn't have any arguments. Perhaps we should make the
12381 * word parsing code into a separate routine. In this case, readtoken
12382 * doesn't need to have any internal procedures, but parseword does.
12383 * We could also make parseoperator in essence the main routine, and
12384 * have parseword (readtoken1?) handle both words and redirection.]
12386 #define NEW_xxreadtoken
12387 #ifdef NEW_xxreadtoken
12388 /* singles must be first! */
12389 static const char xxreadtoken_chars[7] ALIGN1 = {
12390 '\n', '(', ')', /* singles */
12391 '&', '|', ';', /* doubles */
12395 #define xxreadtoken_singles 3
12396 #define xxreadtoken_doubles 3
12398 static const char xxreadtoken_tokens[] ALIGN1 = {
12399 TNL, TLP, TRP, /* only single occurrence allowed */
12400 TBACKGND, TPIPE, TSEMI, /* if single occurrence */
12401 TEOF, /* corresponds to trailing nul */
12402 TAND, TOR, TENDCASE /* if double occurrence */
12414 setprompt_if(needprompt, 2);
12415 startlinno = g_parsefile->linno;
12416 for (;;) { /* until token or start of word found */
12418 if (c == ' ' || c == '\t' IF_ASH_ALIAS( || c == PEOA))
12422 while ((c = pgetc()) != '\n' && c != PEOF)
12425 } else if (c == '\\') {
12426 if (pgetc() != '\n') {
12428 break; /* return readtoken1(...) */
12434 p = xxreadtoken_chars + sizeof(xxreadtoken_chars) - 1;
12440 p = strchr(xxreadtoken_chars, c);
12442 break; /* return readtoken1(...) */
12444 if ((int)(p - xxreadtoken_chars) >= xxreadtoken_singles) {
12446 if (cc == c) { /* double occurrence? */
12447 p += xxreadtoken_doubles + 1;
12450 #if BASH_REDIR_OUTPUT
12451 if (c == '&' && cc == '>') /* &> */
12452 break; /* return readtoken1(...) */
12457 lasttoken = xxreadtoken_tokens[p - xxreadtoken_chars];
12462 return readtoken1(c, BASESYNTAX, (char *) NULL, 0);
12464 #else /* old xxreadtoken */
12465 #define RETURN(token) return lasttoken = token
12475 setprompt_if(needprompt, 2);
12476 startlinno = g_parsefile->linno;
12477 for (;;) { /* until token or start of word found */
12480 case ' ': case '\t':
12481 IF_ASH_ALIAS(case PEOA:)
12484 while ((c = pgetc()) != '\n' && c != PEOF)
12489 if (pgetc() == '\n') {
12501 if (pgetc() == '&')
12506 if (pgetc() == '|')
12511 if (pgetc() == ';')
12524 return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
12527 #endif /* old xxreadtoken */
12533 int kwd = checkkwd;
12535 smallint alreadyseen = tokpushback;
12538 #if ENABLE_ASH_ALIAS
12554 if (t != TWORD || quoteflag) {
12559 * check for keywords
12561 if (kwd & CHKKWD) {
12562 const char *const *pp;
12564 pp = findkwd(wordtext);
12566 lasttoken = t = pp - tokname_array;
12567 TRACE(("keyword '%s' recognized\n", tokname_array[t]));
12572 if (checkkwd & CHKALIAS) {
12573 #if ENABLE_ASH_ALIAS
12575 ap = lookupalias(wordtext, 1);
12578 pushstring(ap->val, ap);
12588 TRACE(("token '%s' %s\n", tokname_array[t], t == TWORD ? wordtext : ""));
12590 TRACE(("reread token '%s' %s\n", tokname_array[t], t == TWORD ? wordtext : ""));
12606 * Read and parse a command. Returns NODE_EOF on end of file.
12607 * (NULL is a valid parse tree indicating a blank line.)
12609 static union node *
12610 parsecmd(int interact)
12615 doprompt = interact;
12616 setprompt_if(doprompt, doprompt);
12622 * Input any here documents.
12627 struct heredoc *here;
12630 here = heredoclist;
12631 heredoclist = NULL;
12634 setprompt_if(needprompt, 2);
12635 readtoken1(pgetc(), here->here->type == NHERE ? SQSYNTAX : DQSYNTAX,
12636 here->eofmark, here->striptabs);
12637 n = stzalloc(sizeof(struct narg));
12638 n->narg.type = NARG;
12639 /*n->narg.next = NULL; - stzalloc did it */
12640 n->narg.text = wordtext;
12641 n->narg.backquote = backquotelist;
12642 here->here->nhere.doc = n;
12648 static const char *
12649 expandstr(const char *ps, int syntax_type)
12654 /* XXX Fix (char *) cast. */
12655 setinputstring((char *)ps);
12657 saveprompt = doprompt;
12659 readtoken1(pgetc(), syntax_type, FAKEEOFMARK, 0);
12660 doprompt = saveprompt;
12664 n.narg.type = NARG;
12665 n.narg.next = NULL;
12666 n.narg.text = wordtext;
12667 n.narg.backquote = backquotelist;
12669 expandarg(&n, NULL, EXP_QUOTED);
12670 return stackblock();
12676 return tokpushback && lasttoken == TEOF;
12680 * Execute a command or commands contained in a string.
12683 evalstring(char *s, int flags)
12685 struct jmploc *volatile savehandler;
12686 struct jmploc jmploc;
12690 struct stackmark smark;
12695 setstackmark(&smark);
12698 /* On exception inside execution loop, we must popfile().
12699 * Try interactively:
12701 * command eval "a=b" # throws "is read only" error
12702 * "command BLTIN" is not supposed to abort (even in non-interactive use).
12703 * But if we skip popfile(), we hit EOF in eval's string, and exit.
12705 savehandler = exception_handler;
12706 ex = setjmp(jmploc.loc);
12709 exception_handler = &jmploc;
12711 while ((n = parsecmd(0)) != NODE_EOF) {
12714 i = evaltree(n, flags & ~(parser_eof() ? 0 : EV_EXIT));
12717 popstackmark(&smark);
12722 popstackmark(&smark);
12726 exception_handler = savehandler;
12728 longjmp(exception_handler->loc, ex);
12734 * The eval command.
12736 static int FAST_FUNC
12737 evalcmd(int argc UNUSED_PARAM, char **argv, int flags)
12746 STARTSTACKSTR(concat);
12748 concat = stack_putstr(p, concat);
12752 STPUTC(' ', concat);
12754 STPUTC('\0', concat);
12755 p = grabstackstr(concat);
12757 return evalstring(p, flags & EV_TESTED);
12763 * Read and execute commands.
12764 * "Top" is nonzero for the top level command loop;
12765 * it turns on prompting if the shell is interactive.
12771 struct stackmark smark;
12776 TRACE(("cmdloop(%d) called\n", top));
12780 setstackmark(&smark);
12783 showjobs(SHOW_CHANGED|SHOW_STDERR);
12786 if (iflag && top) {
12790 n = parsecmd(inter);
12792 if (DEBUG > 2 && debug && (n != NODE_EOF))
12795 if (n == NODE_EOF) {
12796 if (!top || numeof >= 50)
12798 if (!stoppedjobs()) {
12801 out2str("\nUse \"exit\" to leave shell.\n");
12804 } else if (nflag == 0) {
12807 /* job_warning can only be 2,1,0. Here 2->1, 1/0->0 */
12810 i = evaltree(n, 0);
12814 popstackmark(&smark);
12818 evalskip &= ~SKIPFUNC;
12826 * Take commands from a file. To be compatible we should do a path
12827 * search for the file, which is necessary to find sub-commands.
12830 find_dot_file(char *name)
12833 const char *path = pathval();
12836 /* don't try this for absolute or relative paths */
12837 if (strchr(name, '/'))
12840 while ((fullname = path_advance(&path, name)) != NULL) {
12841 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
12843 * Don't bother freeing here, since it will
12844 * be freed by the caller.
12848 if (fullname != name)
12849 stunalloc(fullname);
12852 /* not found in the PATH */
12853 ash_msg_and_raise_error("%s: not found", name);
12857 static int FAST_FUNC
12858 dotcmd(int argc_ UNUSED_PARAM, char **argv_ UNUSED_PARAM)
12860 /* "false; . empty_file; echo $?" should print 0, not 1: */
12864 char *args_need_save;
12865 volatile struct shparam saveparam;
12868 // struct strlist *sp;
12869 // for (sp = cmdenviron; sp; sp = sp->next)
12870 // setvareq(ckstrdup(sp->text), VSTRFIXED | VTEXTFIXED);
12872 nextopt(nullstr); /* handle possible "--" */
12876 /* bash says: "bash: .: filename argument required" */
12877 return 2; /* bash compat */
12880 /* This aborts if file isn't found, which is POSIXly correct.
12881 * bash returns exitcode 1 instead.
12883 fullname = find_dot_file(argv[0]);
12885 args_need_save = argv[0];
12886 if (args_need_save) { /* ". FILE ARGS", and ARGS are not empty */
12888 saveparam = shellparam;
12889 shellparam.malloced = 0;
12893 shellparam.nparam = argc;
12894 shellparam.p = argv;
12897 /* This aborts if file can't be opened, which is POSIXly correct.
12898 * bash returns exitcode 1 instead.
12900 setinputfile(fullname, INPUT_PUSH_FILE);
12901 commandname = fullname;
12902 status = cmdloop(0);
12905 if (args_need_save) {
12906 freeparam(&shellparam);
12907 shellparam = saveparam;
12913 static int FAST_FUNC
12914 exitcmd(int argc UNUSED_PARAM, char **argv)
12919 exitstatus = number(argv[1]);
12920 raise_exception(EXEXIT);
12925 * Read a file containing shell functions.
12928 readcmdfile(char *name)
12930 setinputfile(name, INPUT_PUSH_FILE);
12936 /* ============ find_command inplementation */
12939 * Resolve a command name. If you change this routine, you may have to
12940 * change the shellexec routine as well.
12943 find_command(char *name, struct cmdentry *entry, int act, const char *path)
12945 struct tblentry *cmdp;
12952 struct builtincmd *bcmd;
12954 /* If name contains a slash, don't use PATH or hash table */
12955 if (strchr(name, '/') != NULL) {
12956 entry->u.index = -1;
12957 if (act & DO_ABS) {
12958 while (stat(name, &statb) < 0) {
12960 if (errno == EINTR)
12963 entry->cmdtype = CMDUNKNOWN;
12967 entry->cmdtype = CMDNORMAL;
12971 /* #if ENABLE_FEATURE_SH_STANDALONE... moved after builtin check */
12973 updatetbl = (path == pathval());
12976 if (strstr(path, "%builtin") != NULL)
12977 act |= DO_ALTBLTIN;
12980 /* If name is in the table, check answer will be ok */
12981 cmdp = cmdlookup(name, 0);
12982 if (cmdp != NULL) {
12985 switch (cmdp->cmdtype) {
13003 } else if (cmdp->rehash == 0)
13004 /* if not invalidated by cd, we're done */
13008 /* If %builtin not in path, check for builtin next */
13009 bcmd = find_builtin(name);
13011 if (IS_BUILTIN_REGULAR(bcmd))
13012 goto builtin_success;
13013 if (act & DO_ALTPATH) {
13014 if (!(act & DO_ALTBLTIN))
13015 goto builtin_success;
13016 } else if (builtinloc <= 0) {
13017 goto builtin_success;
13021 #if ENABLE_FEATURE_SH_STANDALONE
13023 int applet_no = find_applet_by_name(name);
13024 if (applet_no >= 0) {
13025 entry->cmdtype = CMDNORMAL;
13026 entry->u.index = -2 - applet_no;
13032 /* We have to search path. */
13033 prev = -1; /* where to start */
13034 if (cmdp && cmdp->rehash) { /* doing a rehash */
13035 if (cmdp->cmdtype == CMDBUILTIN)
13038 prev = cmdp->param.index;
13044 while ((fullname = path_advance(&path, name)) != NULL) {
13045 stunalloc(fullname);
13046 /* NB: code below will still use fullname
13047 * despite it being "unallocated" */
13050 if (prefix(pathopt, "builtin")) {
13052 goto builtin_success;
13055 if ((act & DO_NOFUNC)
13056 || !prefix(pathopt, "func")
13057 ) { /* ignore unimplemented options */
13061 /* if rehash, don't redo absolute path names */
13062 if (fullname[0] == '/' && idx <= prev) {
13065 TRACE(("searchexec \"%s\": no change\n", name));
13068 while (stat(fullname, &statb) < 0) {
13070 if (errno == EINTR)
13073 if (errno != ENOENT && errno != ENOTDIR)
13077 e = EACCES; /* if we fail, this will be the error */
13078 if (!S_ISREG(statb.st_mode))
13080 if (pathopt) { /* this is a %func directory */
13081 stalloc(strlen(fullname) + 1);
13082 /* NB: stalloc will return space pointed by fullname
13083 * (because we don't have any intervening allocations
13084 * between stunalloc above and this stalloc) */
13085 readcmdfile(fullname);
13086 cmdp = cmdlookup(name, 0);
13087 if (cmdp == NULL || cmdp->cmdtype != CMDFUNCTION)
13088 ash_msg_and_raise_error("%s not defined in %s", name, fullname);
13089 stunalloc(fullname);
13092 TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
13094 entry->cmdtype = CMDNORMAL;
13095 entry->u.index = idx;
13099 cmdp = cmdlookup(name, 1);
13100 cmdp->cmdtype = CMDNORMAL;
13101 cmdp->param.index = idx;
13106 /* We failed. If there was an entry for this command, delete it */
13107 if (cmdp && updatetbl)
13108 delete_cmd_entry();
13110 ash_msg("%s: %s", name, errmsg(e, "not found"));
13111 entry->cmdtype = CMDUNKNOWN;
13116 entry->cmdtype = CMDBUILTIN;
13117 entry->u.cmd = bcmd;
13121 cmdp = cmdlookup(name, 1);
13122 cmdp->cmdtype = CMDBUILTIN;
13123 cmdp->param.cmd = bcmd;
13127 entry->cmdtype = cmdp->cmdtype;
13128 entry->u = cmdp->param;
13133 * The trap builtin.
13135 static int FAST_FUNC
13136 trapcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
13140 int signo, exitcode;
13145 for (signo = 0; signo < NSIG; signo++) {
13146 char *tr = trap_ptr[signo];
13148 /* note: bash adds "SIG", but only if invoked
13149 * as "bash". If called as "sh", or if set -o posix,
13150 * then it prints short signal names.
13151 * We are printing short names: */
13152 out1fmt("trap -- %s %s\n",
13154 get_signame(signo));
13155 /* trap_ptr != trap only if we are in special-cased `trap` code.
13156 * In this case, we will exit very soon, no need to free(). */
13157 /* if (trap_ptr != trap && tp[0]) */
13162 if (trap_ptr != trap) {
13170 /* Why the second check?
13171 * "trap NUM [sig2]..." is the same as "trap - NUM [sig2]..."
13172 * In this case, NUM is signal no, not an action.
13175 if (ap[1] && !is_number(ap[0]))
13180 signo = get_signum(*ap);
13182 /* Mimic bash message exactly */
13183 ash_msg("%s: invalid signal specification", *ap);
13189 if (LONE_DASH(action))
13192 if (action[0]) /* not NULL and not "" and not "-" */
13193 may_have_traps = 1;
13194 action = ckstrdup(action);
13198 trap[signo] = action;
13209 /* ============ Builtins */
13211 #if ENABLE_ASH_HELP
13212 static int FAST_FUNC
13213 helpcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
13219 "Built-in commands:\n"
13220 "------------------\n");
13221 for (col = 0, i = 0; i < ARRAY_SIZE(builtintab); i++) {
13222 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '),
13223 builtintab[i].name + 1);
13229 # if ENABLE_FEATURE_SH_STANDALONE
13231 const char *a = applet_names;
13233 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '), a);
13238 while (*a++ != '\0')
13243 newline_and_flush(stdout);
13244 return EXIT_SUCCESS;
13249 static int FAST_FUNC
13250 historycmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
13252 show_history(line_input_state);
13253 return EXIT_SUCCESS;
13258 * The export and readonly commands.
13260 static int FAST_FUNC
13261 exportcmd(int argc UNUSED_PARAM, char **argv)
13271 /* "readonly" in bash accepts, but ignores -n.
13272 * We do the same: it saves a conditional in nextopt's param.
13275 while ((opt = nextopt("np")) != '\0') {
13277 flag_off = VEXPORT;
13280 if (argv[0][0] == 'r') {
13282 flag_off = 0; /* readonly ignores -n */
13284 flag_off = ~flag_off;
13286 /*if (opt_p_not_specified) - bash doesn't check this. Try "export -p NAME" */
13292 p = strchr(name, '=');
13296 vp = *findvar(hashvar(name), name);
13298 vp->flags = ((vp->flags | flag) & flag_off);
13302 setvar(name, p, (flag & flag_off));
13303 } while ((name = *++aptr) != NULL);
13308 /* No arguments. Show the list of exported or readonly vars.
13311 showvars(argv[0], flag, 0);
13316 * Delete a function if it exists.
13319 unsetfunc(const char *name)
13321 struct tblentry *cmdp;
13323 cmdp = cmdlookup(name, 0);
13324 if (cmdp != NULL && cmdp->cmdtype == CMDFUNCTION)
13325 delete_cmd_entry();
13329 * The unset builtin command. We unset the function before we unset the
13330 * variable to allow a function to be unset when there is a readonly variable
13331 * with the same name.
13333 static int FAST_FUNC
13334 unsetcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
13340 while ((i = nextopt("vf")) != 0) {
13344 for (ap = argptr; *ap; ap++) {
13355 static const unsigned char timescmd_str[] ALIGN1 = {
13356 ' ', offsetof(struct tms, tms_utime),
13357 '\n', offsetof(struct tms, tms_stime),
13358 ' ', offsetof(struct tms, tms_cutime),
13359 '\n', offsetof(struct tms, tms_cstime),
13362 static int FAST_FUNC
13363 timescmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
13366 const unsigned char *p;
13369 clk_tck = bb_clk_tck();
13374 unsigned sec, frac;
13376 t = *(clock_t *)(((char *) &buf) + p[1]);
13378 frac = t % clk_tck;
13379 out1fmt("%um%u.%03us%c",
13380 sec / 60, sec % 60,
13381 (frac * 1000) / clk_tck,
13389 #if ENABLE_FEATURE_SH_MATH
13391 * The let builtin. Partially stolen from GNU Bash, the Bourne Again SHell.
13392 * Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
13394 * Copyright (C) 2003 Vladimir Oleynik <dzo@simtreas.ru>
13396 static int FAST_FUNC
13397 letcmd(int argc UNUSED_PARAM, char **argv)
13403 ash_msg_and_raise_error("expression expected");
13405 i = ash_arith(*argv);
13413 * The read builtin. Options:
13414 * -r Do not interpret '\' specially
13415 * -s Turn off echo (tty only)
13416 * -n NCHARS Read NCHARS max
13417 * -p PROMPT Display PROMPT on stderr (if input is from tty)
13418 * -t SECONDS Timeout after SECONDS (tty or pipe only)
13419 * -u FD Read from given FD instead of fd 0
13420 * -d DELIM End on DELIM char, not newline
13421 * This uses unbuffered input, which may be avoidable in some cases.
13422 * TODO: bash also has:
13423 * -a ARRAY Read into array[0],[1],etc
13424 * -e Use line editing (tty only)
13426 static int FAST_FUNC
13427 readcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
13429 char *opt_n = NULL;
13430 char *opt_p = NULL;
13431 char *opt_t = NULL;
13432 char *opt_u = NULL;
13433 char *opt_d = NULL; /* optimized out if !BASH */
13434 int read_flags = 0;
13438 while ((i = nextopt("p:u:rt:n:sd:")) != '\0') {
13447 read_flags |= BUILTIN_READ_SILENT;
13453 read_flags |= BUILTIN_READ_RAW;
13468 /* "read -s" needs to save/restore termios, can't allow ^C
13469 * to jump out of it.
13473 r = shell_builtin_read(setvar0,
13475 bltinlookup("IFS"), /* can be NULL */
13485 if ((uintptr_t)r == 1 && errno == EINTR) {
13486 /* To get SIGCHLD: sleep 1 & read x; echo $x
13487 * Correct behavior is to not exit "read"
13489 if (pending_sig == 0)
13493 if ((uintptr_t)r > 1)
13494 ash_msg_and_raise_error(r);
13496 return (uintptr_t)r;
13499 static int FAST_FUNC
13500 umaskcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
13502 static const char permuser[3] ALIGN1 = "ogu";
13505 int symbolic_mode = 0;
13507 while (nextopt("S") != '\0') {
13516 if (*argptr == NULL) {
13517 if (symbolic_mode) {
13518 char buf[sizeof(",u=rwx,g=rwx,o=rwx")];
13525 *p++ = permuser[i];
13527 /* mask is 0..0uuugggooo. i=2 selects uuu bits */
13528 if (!(mask & 0400)) *p++ = 'r';
13529 if (!(mask & 0200)) *p++ = 'w';
13530 if (!(mask & 0100)) *p++ = 'x';
13538 out1fmt("%04o\n", mask);
13541 char *modestr = *argptr;
13542 /* numeric umasks are taken as-is */
13543 /* symbolic umasks are inverted: "umask a=rx" calls umask(222) */
13544 if (!isdigit(modestr[0]))
13546 mask = bb_parse_mode(modestr, mask);
13547 if ((unsigned)mask > 0777) {
13548 ash_msg_and_raise_error("illegal mode: %s", modestr);
13550 if (!isdigit(modestr[0]))
13557 static int FAST_FUNC
13558 ulimitcmd(int argc UNUSED_PARAM, char **argv)
13560 return shell_builtin_ulimit(argv);
13563 /* ============ main() and helpers */
13566 * Called to exit the shell.
13575 #if ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
13576 save_history(line_input_state);
13578 status = exitstatus;
13579 TRACE(("pid %d, exitshell(%d)\n", getpid(), status));
13580 if (setjmp(loc.loc)) {
13581 if (exception_type == EXEXIT)
13582 status = exitstatus;
13585 exception_handler = &loc;
13591 /*free(p); - we'll exit soon */
13594 /* dash wraps setjobctl(0) in "if (setjmp(loc.loc) == 0) {...}".
13595 * our setjobctl(0) does not panic if tcsetpgrp fails inside it.
13598 flush_stdout_stderr();
13603 /* Don't inline: conserve stack of caller from having our locals too */
13604 static NOINLINE void
13607 /* we will never free this */
13608 basepf.next_to_pgetc = basepf.buf = ckmalloc(IBUFSIZ);
13611 sigmode[SIGCHLD - 1] = S_DFL; /* ensure we install handler even if it is SIG_IGNed */
13612 setsignal(SIGCHLD);
13614 /* bash re-enables SIGHUP which is SIG_IGNed on entry.
13615 * Try: "trap '' HUP; bash; echo RET" and type "kill -HUP $$"
13617 signal(SIGHUP, SIG_DFL);
13624 for (envp = environ; envp && *envp; envp++) {
13625 p = endofname(*envp);
13626 if (p != *envp && *p == '=') {
13627 setvareq(*envp, VEXPORT|VTEXTFIXED);
13631 setvareq((char*)defoptindvar, VTEXTFIXED);
13633 setvar0("PPID", utoa(getppid()));
13635 p = lookupvar("SHLVL");
13636 setvar("SHLVL", utoa((p ? atoi(p) : 0) + 1), VEXPORT);
13638 #if BASH_HOSTNAME_VAR
13639 if (!lookupvar("HOSTNAME")) {
13640 struct utsname uts;
13642 setvar0("HOSTNAME", uts.nodename);
13645 p = lookupvar("PWD");
13647 struct stat st1, st2;
13648 if (p[0] != '/' || stat(p, &st1) || stat(".", &st2)
13649 || st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino
13659 //usage:#define ash_trivial_usage
13660 //usage: "[-/+OPTIONS] [-/+o OPT]... [-c 'SCRIPT' [ARG0 [ARGS]] / FILE [ARGS]]"
13661 //usage:#define ash_full_usage "\n\n"
13662 //usage: "Unix shell interpreter"
13665 * Process the shell command line arguments.
13668 procargs(char **argv)
13671 const char *xminusc;
13676 login_sh = xargv[0] && xargv[0][0] == '-';
13678 /* if (xargv[0]) - mmm, this is always true! */
13680 for (i = 0; i < NOPTS; i++)
13683 if (options(/*cmdline:*/ 1, &login_sh)) {
13684 /* it already printed err message */
13685 raise_exception(EXERROR);
13689 if (*xargv == NULL) {
13691 ash_msg_and_raise_error(bb_msg_requires_arg, "-c");
13694 if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
13698 for (i = 0; i < NOPTS; i++)
13699 if (optlist[i] == 2)
13704 /* POSIX 1003.2: first arg after "-c CMD" is $0, remainder $1... */
13709 } else if (!sflag) {
13710 setinputfile(*xargv, 0);
13713 commandname = arg0;
13716 shellparam.p = xargv;
13717 #if ENABLE_ASH_GETOPTS
13718 shellparam.optind = 1;
13719 shellparam.optoff = -1;
13721 /* assert(shellparam.malloced == 0 && shellparam.nparam == 0); */
13723 shellparam.nparam++;
13732 * Read /etc/profile, ~/.profile, $ENV.
13735 read_profile(const char *name)
13737 name = expandstr(name, DQSYNTAX);
13738 if (setinputfile(name, INPUT_PUSH_FILE | INPUT_NOFILE_OK) < 0)
13745 * This routine is called when an error or an interrupt occurs in an
13746 * interactive shell and control is returned to the main command loop.
13747 * (In dash, this function is auto-generated by build machinery).
13756 /* from expand.c: */
13759 /* from input.c: */
13760 g_parsefile->left_in_buffer = 0;
13761 g_parsefile->left_in_line = 0; /* clear input buffer */
13764 /* from redir.c: */
13768 unwindlocalvars(NULL);
13772 static short profile_buf[16384];
13773 extern int etext();
13777 * Main routine. We initialize things, parse the arguments, execute
13778 * profiles if we're a login shell, and then call cmdloop to execute
13779 * commands. The setjmp call sets up the location to jump to when an
13780 * exception occurs. When an exception occurs the variable "state"
13781 * is used to figure out how far we had gotten.
13783 int ash_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
13784 int ash_main(int argc UNUSED_PARAM, char **argv)
13786 volatile smallint state;
13787 struct jmploc jmploc;
13788 struct stackmark smark;
13791 /* Initialize global data */
13795 #if ENABLE_ASH_ALIAS
13801 monitor(4, etext, profile_buf, sizeof(profile_buf), 50);
13804 #if ENABLE_FEATURE_EDITING
13805 line_input_state = new_line_input_t(FOR_SHELL | WITH_PATH_LOOKUP);
13808 if (setjmp(jmploc.loc)) {
13814 e = exception_type;
13816 if (e == EXEXIT || s == 0 || iflag == 0 || shlvl) {
13820 newline_and_flush(stderr);
13823 popstackmark(&smark);
13824 FORCE_INT_ON; /* enable interrupts */
13833 exception_handler = &jmploc;
13834 rootpid = getpid();
13837 setstackmark(&smark);
13838 login_sh = procargs(argv);
13840 TRACE(("Shell args: "));
13841 trace_puts_args(argv);
13848 read_profile("/etc/profile");
13851 hp = lookupvar("HOME");
13853 read_profile("$HOME/.profile");
13859 getuid() == geteuid() && getgid() == getegid() &&
13863 const char *shinit = lookupvar("ENV");
13864 if (shinit != NULL && *shinit != '\0')
13865 read_profile(shinit);
13867 popstackmark(&smark);
13871 /* evalstring pushes parsefile stack.
13872 * Ensure we don't falsely claim that 0 (stdin)
13873 * is one of stacked source fds.
13874 * Testcase: ash -c 'exec 1>&0' must not complain. */
13875 // if (!sflag) g_parsefile->pf_fd = -1;
13876 // ^^ not necessary since now we special-case fd 0
13877 // in save_fd_on_redirect()
13878 evalstring(minusc, sflag ? 0 : EV_EXIT);
13881 if (sflag || minusc == NULL) {
13882 #if MAX_HISTORY > 0 && ENABLE_FEATURE_EDITING_SAVEHISTORY
13884 const char *hp = lookupvar("HISTFILE");
13886 hp = lookupvar("HOME");
13889 hp = concat_path_file(hp, ".ash_history");
13890 setvar0("HISTFILE", hp);
13893 hp = lookupvar("HISTFILE");
13897 line_input_state->hist_file = hp;
13898 # if ENABLE_FEATURE_SH_HISTFILESIZE
13899 hp = lookupvar("HISTFILESIZE");
13900 line_input_state->max_history = size_from_HISTFILESIZE(hp);
13904 state4: /* XXX ??? - why isn't this before the "if" statement */
13912 extern void _mcleanup(void);
13916 TRACE(("End of main reached\n"));
13923 * Copyright (c) 1989, 1991, 1993, 1994
13924 * The Regents of the University of California. All rights reserved.
13926 * This code is derived from software contributed to Berkeley by
13927 * Kenneth Almquist.
13929 * Redistribution and use in source and binary forms, with or without
13930 * modification, are permitted provided that the following conditions
13932 * 1. Redistributions of source code must retain the above copyright
13933 * notice, this list of conditions and the following disclaimer.
13934 * 2. Redistributions in binary form must reproduce the above copyright
13935 * notice, this list of conditions and the following disclaimer in the
13936 * documentation and/or other materials provided with the distribution.
13937 * 3. Neither the name of the University nor the names of its contributors
13938 * may be used to endorse or promote products derived from this software
13939 * without specific prior written permission.
13941 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND
13942 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
13943 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
13944 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
13945 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
13946 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
13947 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
13948 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
13949 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
13950 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF