1 /* vi: set sw=4 ts=4: */
3 * ash shell port for busybox
5 * This code is derived from software contributed to Berkeley by
8 * Original BSD copyright notice is retained at the end of this file.
10 * Copyright (c) 1989, 1991, 1993, 1994
11 * The Regents of the University of California. All rights reserved.
13 * Copyright (c) 1997-2005 Herbert Xu <herbert@gondor.apana.org.au>
14 * was re-ported from NetBSD and debianized.
16 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
20 * The following should be set to reflect the type of system you have:
21 * JOBS -> 1 if you have Berkeley job control, 0 otherwise.
22 * define SYSV if you are running under System V.
23 * define DEBUG=1 to compile in debugging ('set -o debug' to turn on)
24 * define DEBUG=2 to compile in and turn on debugging.
26 * When debugging is on (DEBUG is 1 and "set -o debug" was executed),
27 * debugging info will be written to ./trace and a quit signal
28 * will generate a core dump.
31 /* Tweak debug output verbosity here */
38 #define JOBS ENABLE_ASH_JOB_CONTROL
42 #include <sys/times.h>
43 #include <sys/utsname.h> /* for setting $HOSTNAME */
45 #include "busybox.h" /* for applet_names */
47 #if defined(__ANDROID_API__) && __ANDROID_API__ <= 24
48 /* Bionic at least up to version 24 has no glob() */
49 # undef ENABLE_ASH_INTERNAL_GLOB
50 # define ENABLE_ASH_INTERNAL_GLOB 1
53 #if !ENABLE_ASH_INTERNAL_GLOB
58 #include "shell_common.h"
59 #if ENABLE_SH_MATH_SUPPORT
62 #if ENABLE_ASH_RANDOM_SUPPORT
65 # define CLEAR_RANDOM_T(rnd) ((void)0)
68 #include "NUM_APPLETS.h"
70 /* STANDALONE does not make sense, and won't compile */
71 # undef CONFIG_FEATURE_SH_STANDALONE
72 # undef ENABLE_FEATURE_SH_STANDALONE
73 # undef IF_FEATURE_SH_STANDALONE
74 # undef IF_NOT_FEATURE_SH_STANDALONE
75 # define ENABLE_FEATURE_SH_STANDALONE 0
76 # define IF_FEATURE_SH_STANDALONE(...)
77 # define IF_NOT_FEATURE_SH_STANDALONE(...) __VA_ARGS__
81 # define PIPE_BUF 4096 /* amount of buffering in a pipe */
85 # error "Do not even bother, ash will not run on NOMMU machine"
91 //config: depends on !NOMMU
93 //config: Tha 'ash' shell adds about 60k in the default configuration and is
94 //config: the most complete and most pedantically correct shell included with
95 //config: busybox. This shell is actually a derivative of the Debian 'dash'
96 //config: shell (by Herbert Xu), which was created by porting the 'ash' shell
97 //config: (written by Kenneth Almquist) from NetBSD.
99 //config:config ASH_OPTIMIZE_FOR_SIZE
100 //config: bool "Optimize for size instead of speed"
102 //config: depends on ASH
104 //config: Compile ash for reduced size at the price of speed.
106 //config:config ASH_INTERNAL_GLOB
107 //config: bool "Use internal glob() implementation"
109 //config: depends on ASH
111 //config: Do not use glob() function from libc, use internal implementation.
112 //config: Use this if you are getting "glob.h: No such file or directory"
113 //config: or similar build errors.
115 //config:config ASH_RANDOM_SUPPORT
116 //config: bool "Pseudorandom generator and $RANDOM variable"
118 //config: depends on ASH
120 //config: Enable pseudorandom generator and dynamic variable "$RANDOM".
121 //config: Each read of "$RANDOM" will generate a new pseudorandom value.
122 //config: You can reset the generator by using a specified start value.
123 //config: After "unset RANDOM" the generator will switch off and this
124 //config: variable will no longer have special treatment.
126 //config:config ASH_EXPAND_PRMT
127 //config: bool "Expand prompt string"
129 //config: depends on ASH
131 //config: "PS#" may contain volatile content, such as backquote commands.
132 //config: This option recreates the prompt string from the environment
133 //config: variable each time it is displayed.
135 //config:config ASH_BASH_COMPAT
136 //config: bool "bash-compatible extensions"
138 //config: depends on ASH
140 //config: Enable bash-compatible extensions.
142 //config:config ASH_IDLE_TIMEOUT
143 //config: bool "Idle timeout variable"
145 //config: depends on ASH
147 //config: Enables bash-like auto-logout after $TMOUT seconds of idle time.
149 //config:config ASH_JOB_CONTROL
150 //config: bool "Job control"
152 //config: depends on ASH
154 //config: Enable job control in the ash shell.
156 //config:config ASH_ALIAS
157 //config: bool "Alias support"
159 //config: depends on ASH
161 //config: Enable alias support in the ash shell.
163 //config:config ASH_GETOPTS
164 //config: bool "Builtin getopt to parse positional parameters"
166 //config: depends on ASH
168 //config: Enable support for getopts builtin in ash.
170 //config:config ASH_BUILTIN_ECHO
171 //config: bool "Builtin version of 'echo'"
173 //config: depends on ASH
175 //config: Enable support for echo builtin in ash.
177 //config:config ASH_BUILTIN_PRINTF
178 //config: bool "Builtin version of 'printf'"
180 //config: depends on ASH
182 //config: Enable support for printf builtin in ash.
184 //config:config ASH_BUILTIN_TEST
185 //config: bool "Builtin version of 'test'"
187 //config: depends on ASH
189 //config: Enable support for test builtin in ash.
191 //config:config ASH_HELP
192 //config: bool "help builtin"
194 //config: depends on ASH
196 //config: Enable help builtin in ash.
198 //config:config ASH_CMDCMD
199 //config: bool "'command' command to override shell builtins"
201 //config: depends on ASH
203 //config: Enable support for the ash 'command' builtin, which allows
204 //config: you to run the specified command with the specified arguments,
205 //config: even when there is an ash builtin command with the same name.
207 //config:config ASH_MAIL
208 //config: bool "Check for new mail on interactive shells"
210 //config: depends on ASH
212 //config: Enable "check for new mail" function in the ash shell.
215 //applet:IF_ASH(APPLET(ash, BB_DIR_BIN, BB_SUID_DROP))
216 //applet:IF_FEATURE_SH_IS_ASH(APPLET_ODDNAME(sh, ash, BB_DIR_BIN, BB_SUID_DROP, sh))
217 //applet:IF_FEATURE_BASH_IS_ASH(APPLET_ODDNAME(bash, ash, BB_DIR_BIN, BB_SUID_DROP, bash))
219 //kbuild:lib-$(CONFIG_ASH) += ash.o ash_ptr_hack.o shell_common.o
220 //kbuild:lib-$(CONFIG_ASH_RANDOM_SUPPORT) += random.o
223 /* ============ Hash table sizes. Configurable. */
227 #define CMDTABLESIZE 31 /* should be prime */
230 /* ============ Shell options */
232 static const char *const optletters_optnames[] = {
247 #if ENABLE_ASH_BASH_COMPAT
256 #define optletters(n) optletters_optnames[n][0]
257 #define optnames(n) (optletters_optnames[n] + 1)
259 enum { NOPTS = ARRAY_SIZE(optletters_optnames) };
262 /* ============ Misc data */
264 #define msg_illnum "Illegal number: %s"
267 * We enclose jmp_buf in a structure so that we can declare pointers to
268 * jump locations. The global variable handler contains the location to
269 * jump to when an exception occurs, and the global variable exception_type
270 * contains a code identifying the exception. To implement nested
271 * exception handlers, the user should save the value of handler on entry
272 * to an inner scope, set handler to point to a jmploc structure for the
273 * inner scope, and restore handler on exit from the scope.
279 struct globals_misc {
280 uint8_t exitstatus; /* exit status of last command */
281 uint8_t back_exitstatus;/* exit status of backquoted command */
282 smallint job_warning; /* user was warned about stopped jobs (can be 2, 1 or 0). */
283 int rootpid; /* pid of main shell */
284 /* shell level: 0 for the main shell, 1 for its children, and so on */
286 #define rootshell (!shlvl)
287 char *minusc; /* argument to -c option */
289 char *curdir; // = nullstr; /* current working directory */
290 char *physdir; // = nullstr; /* physical working directory */
292 char *arg0; /* value of $0 */
294 struct jmploc *exception_handler;
296 volatile int suppress_int; /* counter */
297 volatile /*sig_atomic_t*/ smallint pending_int; /* 1 = got SIGINT */
298 /* last pending signal */
299 volatile /*sig_atomic_t*/ smallint pending_sig;
300 smallint exception_type; /* kind of exception (0..5) */
302 #define EXINT 0 /* SIGINT received */
303 #define EXERROR 1 /* a generic error */
304 #define EXEXIT 4 /* exit the shell */
305 #define EXSIG 5 /* trapped signal in wait(1) */
308 char nullstr[1]; /* zero length string */
311 #define eflag optlist[0]
312 #define fflag optlist[1]
313 #define Iflag optlist[2]
314 #define iflag optlist[3]
315 #define mflag optlist[4]
316 #define nflag optlist[5]
317 #define sflag optlist[6]
318 #define xflag optlist[7]
319 #define vflag optlist[8]
320 #define Cflag optlist[9]
321 #define aflag optlist[10]
322 #define bflag optlist[11]
323 #define uflag optlist[12]
324 #define viflag optlist[13]
325 #if ENABLE_ASH_BASH_COMPAT
326 # define pipefail optlist[14]
331 # define nolog optlist[14 + ENABLE_ASH_BASH_COMPAT]
332 # define debug optlist[15 + ENABLE_ASH_BASH_COMPAT]
335 /* trap handler commands */
337 * Sigmode records the current value of the signal handlers for the various
338 * modes. A value of zero means that the current handler is not known.
339 * S_HARD_IGN indicates that the signal was ignored on entry to the shell.
341 char sigmode[NSIG - 1];
342 #define S_DFL 1 /* default signal handling (SIG_DFL) */
343 #define S_CATCH 2 /* signal is caught */
344 #define S_IGN 3 /* signal is ignored (SIG_IGN) */
345 #define S_HARD_IGN 4 /* signal is ignored permanently */
347 /* indicates specified signal received */
348 uint8_t gotsig[NSIG - 1]; /* offset by 1: "signal" 0 is meaningless */
349 uint8_t may_have_traps; /* 0: definitely no traps are set, 1: some traps may be set */
351 char **trap_ptr; /* used only by "trap hack" */
353 /* Rarely referenced stuff */
354 #if ENABLE_ASH_RANDOM_SUPPORT
357 pid_t backgndpid; /* pid of last background process */
359 extern struct globals_misc *const ash_ptr_to_globals_misc;
360 #define G_misc (*ash_ptr_to_globals_misc)
361 #define exitstatus (G_misc.exitstatus )
362 #define back_exitstatus (G_misc.back_exitstatus )
363 #define job_warning (G_misc.job_warning)
364 #define rootpid (G_misc.rootpid )
365 #define shlvl (G_misc.shlvl )
366 #define minusc (G_misc.minusc )
367 #define curdir (G_misc.curdir )
368 #define physdir (G_misc.physdir )
369 #define arg0 (G_misc.arg0 )
370 #define exception_handler (G_misc.exception_handler)
371 #define exception_type (G_misc.exception_type )
372 #define suppress_int (G_misc.suppress_int )
373 #define pending_int (G_misc.pending_int )
374 #define pending_sig (G_misc.pending_sig )
375 #define isloginsh (G_misc.isloginsh )
376 #define nullstr (G_misc.nullstr )
377 #define optlist (G_misc.optlist )
378 #define sigmode (G_misc.sigmode )
379 #define gotsig (G_misc.gotsig )
380 #define may_have_traps (G_misc.may_have_traps )
381 #define trap (G_misc.trap )
382 #define trap_ptr (G_misc.trap_ptr )
383 #define random_gen (G_misc.random_gen )
384 #define backgndpid (G_misc.backgndpid )
385 #define INIT_G_misc() do { \
386 (*(struct globals_misc**)&ash_ptr_to_globals_misc) = xzalloc(sizeof(G_misc)); \
394 /* ============ DEBUG */
396 static void trace_printf(const char *fmt, ...);
397 static void trace_vprintf(const char *fmt, va_list va);
398 # define TRACE(param) trace_printf param
399 # define TRACEV(param) trace_vprintf param
400 # define close(fd) do { \
402 if (close(dfd) < 0) \
403 bb_error_msg("bug on %d: closing %d(0x%x)", \
404 __LINE__, dfd, dfd); \
407 # define TRACE(param)
408 # define TRACEV(param)
412 /* ============ Utility functions */
413 #define is_name(c) ((c) == '_' || isalpha((unsigned char)(c)))
414 #define is_in_name(c) ((c) == '_' || isalnum((unsigned char)(c)))
417 isdigit_str9(const char *str)
419 int maxlen = 9 + 1; /* max 9 digits: 999999999 */
420 while (--maxlen && isdigit(*str))
422 return (*str == '\0');
426 var_end(const char *var)
435 /* ============ Interrupts / exceptions */
437 static void exitshell(void) NORETURN;
440 * These macros allow the user to suspend the handling of interrupt signals
441 * over a period of time. This is similar to SIGHOLD or to sigblock, but
442 * much more efficient and portable. (But hacking the kernel is so much
443 * more fun than worrying about efficiency and portability. :-))
445 #define INT_OFF do { \
451 * Called to raise an exception. Since C doesn't include exceptions, we
452 * just do a longjmp to the exception handler. The type of exception is
453 * stored in the global variable "exception_type".
455 static void raise_exception(int) NORETURN;
457 raise_exception(int e)
460 if (exception_handler == NULL)
465 longjmp(exception_handler->loc, 1);
468 #define raise_exception(e) do { \
469 TRACE(("raising exception %d on line %d\n", (e), __LINE__)); \
470 raise_exception(e); \
475 * Called when a SIGINT is received. (If the user specifies
476 * that SIGINT is to be trapped or ignored using the trap builtin, then
477 * this routine is not called.) Suppressint is nonzero when interrupts
478 * are held using the INT_OFF macro. (The test for iflag is just
479 * defensive programming.)
481 static void raise_interrupt(void) NORETURN;
483 raise_interrupt(void)
488 /* Signal is not automatically unmasked after it is raised,
489 * do it ourself - unmask all signals */
490 sigprocmask_allsigs(SIG_UNBLOCK);
491 /* pending_sig = 0; - now done in signal_handler() */
494 if (gotsig[SIGINT - 1] && !trap[SIGINT]) {
495 if (!(rootshell && iflag)) {
496 /* Kill ourself with SIGINT */
497 signal(SIGINT, SIG_DFL);
502 /* bash: ^C even on empty command line sets $? */
503 exitstatus = SIGINT + 128;
504 raise_exception(ex_type);
508 #define raise_interrupt() do { \
509 TRACE(("raising interrupt on line %d\n", __LINE__)); \
514 static IF_ASH_OPTIMIZE_FOR_SIZE(inline) void
518 if (--suppress_int == 0 && pending_int) {
522 #define INT_ON int_on()
523 static IF_ASH_OPTIMIZE_FOR_SIZE(inline) void
531 #define FORCE_INT_ON force_int_on()
533 #define SAVE_INT(v) ((v) = suppress_int)
535 #define RESTORE_INT(v) do { \
537 suppress_int = (v); \
538 if (suppress_int == 0 && pending_int) \
543 /* ============ Stdout/stderr output */
546 outstr(const char *p, FILE *file)
554 flush_stdout_stderr(void)
561 /* Was called outcslow(c,FILE*), but c was always '\n' */
563 newline_and_flush(FILE *dest)
571 static int out1fmt(const char *, ...) __attribute__((__format__(__printf__,1,2)));
573 out1fmt(const char *fmt, ...)
580 r = vprintf(fmt, ap);
586 static int fmtstr(char *, size_t, const char *, ...) __attribute__((__format__(__printf__,3,4)));
588 fmtstr(char *outbuf, size_t length, const char *fmt, ...)
595 ret = vsnprintf(outbuf, length, fmt, ap);
602 out1str(const char *p)
608 out2str(const char *p)
611 flush_stdout_stderr();
615 /* ============ Parser structures */
617 /* control characters in argument strings */
618 #define CTL_FIRST CTLESC
619 #define CTLESC ((unsigned char)'\201') /* escape next character */
620 #define CTLVAR ((unsigned char)'\202') /* variable defn */
621 #define CTLENDVAR ((unsigned char)'\203')
622 #define CTLBACKQ ((unsigned char)'\204')
623 #define CTLARI ((unsigned char)'\206') /* arithmetic expression */
624 #define CTLENDARI ((unsigned char)'\207')
625 #define CTLQUOTEMARK ((unsigned char)'\210')
626 #define CTL_LAST CTLQUOTEMARK
628 /* variable substitution byte (follows CTLVAR) */
629 #define VSTYPE 0x0f /* type of variable substitution */
630 #define VSNUL 0x10 /* colon--treat the empty string as unset */
632 /* values of VSTYPE field */
633 #define VSNORMAL 0x1 /* normal variable: $var or ${var} */
634 #define VSMINUS 0x2 /* ${var-text} */
635 #define VSPLUS 0x3 /* ${var+text} */
636 #define VSQUESTION 0x4 /* ${var?message} */
637 #define VSASSIGN 0x5 /* ${var=text} */
638 #define VSTRIMRIGHT 0x6 /* ${var%pattern} */
639 #define VSTRIMRIGHTMAX 0x7 /* ${var%%pattern} */
640 #define VSTRIMLEFT 0x8 /* ${var#pattern} */
641 #define VSTRIMLEFTMAX 0x9 /* ${var##pattern} */
642 #define VSLENGTH 0xa /* ${#var} */
643 #if ENABLE_ASH_BASH_COMPAT
644 #define VSSUBSTR 0xc /* ${var:position:length} */
645 #define VSREPLACE 0xd /* ${var/pattern/replacement} */
646 #define VSREPLACEALL 0xe /* ${var//pattern/replacement} */
649 static const char dolatstr[] ALIGN1 = {
650 CTLQUOTEMARK, CTLVAR, VSNORMAL, '@', '=', CTLQUOTEMARK, '\0'
652 #define DOLATSTRLEN 6
671 #if ENABLE_ASH_BASH_COMPAT
688 smallint type; /* Nxxxx */
691 union node *redirect;
696 smallint pipe_backgnd;
697 struct nodelist *cmdlist;
703 union node *redirect;
716 union node *elsepart;
743 struct nodelist *backquote;
746 /* nfile and ndup layout must match!
747 * NTOFD (>&fdnum) uses ndup structure, but we may discover mid-flight
748 * that it is actually NTO2 (>&file), and change its type.
765 char *_unused_expfname;
784 struct nredir nredir;
785 struct nbinary nbinary;
789 struct nclist nclist;
798 * NODE_EOF is returned by parsecmd when it encounters an end of file.
799 * It must be distinct from NULL.
801 #define NODE_EOF ((union node *) -1L)
804 struct nodelist *next;
817 freefunc(struct funcnode *f)
819 if (f && --f->count < 0)
824 /* ============ Debugging output */
828 static FILE *tracefile;
831 trace_printf(const char *fmt, ...)
838 fprintf(tracefile, "%u ", (int) time(NULL));
840 fprintf(tracefile, "[%u] ", (int) getpid());
842 fprintf(tracefile, "pending s:%d i:%d(supp:%d) ", pending_sig, pending_int, suppress_int);
844 vfprintf(tracefile, fmt, va);
849 trace_vprintf(const char *fmt, va_list va)
854 fprintf(tracefile, "%u ", (int) time(NULL));
856 fprintf(tracefile, "[%u] ", (int) getpid());
858 fprintf(tracefile, "pending s:%d i:%d(supp:%d) ", pending_sig, pending_int, suppress_int);
859 vfprintf(tracefile, fmt, va);
863 trace_puts(const char *s)
871 trace_puts_quoted(char *s)
878 putc('"', tracefile);
879 for (p = s; *p; p++) {
880 switch ((unsigned char)*p) {
881 case '\n': c = 'n'; goto backslash;
882 case '\t': c = 't'; goto backslash;
883 case '\r': c = 'r'; goto backslash;
884 case '\"': c = '\"'; goto backslash;
885 case '\\': c = '\\'; goto backslash;
886 case CTLESC: c = 'e'; goto backslash;
887 case CTLVAR: c = 'v'; goto backslash;
888 case CTLBACKQ: c = 'q'; goto backslash;
890 putc('\\', tracefile);
894 if (*p >= ' ' && *p <= '~')
897 putc('\\', tracefile);
898 putc((*p >> 6) & 03, tracefile);
899 putc((*p >> 3) & 07, tracefile);
900 putc(*p & 07, tracefile);
905 putc('"', tracefile);
909 trace_puts_args(char **ap)
916 trace_puts_quoted(*ap);
918 putc('\n', tracefile);
921 putc(' ', tracefile);
936 /* leave open because libedit might be using it */
939 strcpy(s, "./trace");
941 if (!freopen(s, "a", tracefile)) {
942 fprintf(stderr, "Can't re-open %s\n", s);
947 tracefile = fopen(s, "a");
948 if (tracefile == NULL) {
949 fprintf(stderr, "Can't open %s\n", s);
955 flags = fcntl(fileno(tracefile), F_GETFL);
957 fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND);
959 setlinebuf(tracefile);
960 fputs("\nTracing started.\n", tracefile);
964 indent(int amount, char *pfx, FILE *fp)
968 for (i = 0; i < amount; i++) {
969 if (pfx && i == amount - 1)
975 /* little circular references here... */
976 static void shtree(union node *n, int ind, char *pfx, FILE *fp);
979 sharg(union node *arg, FILE *fp)
982 struct nodelist *bqlist;
983 unsigned char subtype;
985 if (arg->type != NARG) {
986 out1fmt("<node type %d>\n", arg->type);
989 bqlist = arg->narg.backquote;
990 for (p = arg->narg.text; *p; p++) {
991 switch ((unsigned char)*p) {
1000 if (subtype == VSLENGTH)
1008 if (subtype & VSNUL)
1011 switch (subtype & VSTYPE) {
1037 case VSTRIMRIGHTMAX:
1044 out1fmt("<subtype %d>", subtype);
1053 shtree(bqlist->n, -1, NULL, fp);
1064 shcmd(union node *cmd, FILE *fp)
1072 for (np = cmd->ncmd.args; np; np = np->narg.next) {
1078 for (np = cmd->ncmd.redirect; np; np = np->nfile.next) {
1082 switch (np->nfile.type) {
1083 case NTO: s = ">>"+1; dftfd = 1; break;
1084 case NCLOBBER: s = ">|"; dftfd = 1; break;
1085 case NAPPEND: s = ">>"; dftfd = 1; break;
1086 #if ENABLE_ASH_BASH_COMPAT
1089 case NTOFD: s = ">&"; dftfd = 1; break;
1090 case NFROM: s = "<"; break;
1091 case NFROMFD: s = "<&"; break;
1092 case NFROMTO: s = "<>"; break;
1093 default: s = "*error*"; break;
1095 if (np->nfile.fd != dftfd)
1096 fprintf(fp, "%d", np->nfile.fd);
1098 if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) {
1099 fprintf(fp, "%d", np->ndup.dupfd);
1101 sharg(np->nfile.fname, fp);
1108 shtree(union node *n, int ind, char *pfx, FILE *fp)
1110 struct nodelist *lp;
1116 indent(ind, pfx, fp);
1118 if (n == NODE_EOF) {
1133 shtree(n->nbinary.ch1, ind, NULL, fp);
1136 shtree(n->nbinary.ch2, ind, NULL, fp);
1144 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
1145 shtree(lp->n, 0, NULL, fp);
1149 if (n->npipe.pipe_backgnd)
1155 fprintf(fp, "<node type %d>", n->type);
1163 showtree(union node *n)
1165 trace_puts("showtree called\n");
1166 shtree(n, 1, NULL, stderr);
1172 /* ============ Parser data */
1175 * ash_vmsg() needs parsefile->fd, hence parsefile definition is moved up.
1178 struct strlist *next;
1185 struct strpush *prev; /* preceding string on stack */
1187 int prev_left_in_line;
1188 #if ENABLE_ASH_ALIAS
1189 struct alias *ap; /* if push was associated with an alias */
1191 char *string; /* remember the string since it may change */
1193 /* Remember last two characters for pungetc. */
1196 /* Number of outstanding calls to pungetc. */
1201 struct parsefile *prev; /* preceding file on stack */
1202 int linno; /* current line */
1203 int pf_fd; /* file descriptor (or -1 if string) */
1204 int left_in_line; /* number of chars left in this line */
1205 int left_in_buffer; /* number of chars left in this buffer past the line */
1206 char *next_to_pgetc; /* next char in buffer */
1207 char *buf; /* input buffer */
1208 struct strpush *strpush; /* for pushing strings at this level */
1209 struct strpush basestrpush; /* so pushing one is fast */
1211 /* Remember last two characters for pungetc. */
1214 /* Number of outstanding calls to pungetc. */
1218 static struct parsefile basepf; /* top level input file */
1219 static struct parsefile *g_parsefile = &basepf; /* current input file */
1220 static int startlinno; /* line # where last token started */
1221 static char *commandname; /* currently executing command */
1222 static struct strlist *cmdenviron; /* environment for builtin command */
1225 /* ============ Message printing */
1228 ash_vmsg(const char *msg, va_list ap)
1230 fprintf(stderr, "%s: ", arg0);
1232 if (strcmp(arg0, commandname))
1233 fprintf(stderr, "%s: ", commandname);
1234 if (!iflag || g_parsefile->pf_fd > 0)
1235 fprintf(stderr, "line %d: ", startlinno);
1237 vfprintf(stderr, msg, ap);
1238 newline_and_flush(stderr);
1242 * Exverror is called to raise the error exception. If the second argument
1243 * is not NULL then error prints an error message using printf style
1244 * formatting. It then raises the error exception.
1246 static void ash_vmsg_and_raise(int, const char *, va_list) NORETURN;
1248 ash_vmsg_and_raise(int cond, const char *msg, va_list ap)
1252 TRACE(("ash_vmsg_and_raise(%d, \"", cond));
1254 TRACE(("\") pid=%d\n", getpid()));
1256 TRACE(("ash_vmsg_and_raise(%d, NULL) pid=%d\n", cond, getpid()));
1261 flush_stdout_stderr();
1262 raise_exception(cond);
1266 static void ash_msg_and_raise_error(const char *, ...) NORETURN;
1268 ash_msg_and_raise_error(const char *msg, ...)
1273 ash_vmsg_and_raise(EXERROR, msg, ap);
1278 static void raise_error_syntax(const char *) NORETURN;
1280 raise_error_syntax(const char *msg)
1282 ash_msg_and_raise_error("syntax error: %s", msg);
1286 static void ash_msg_and_raise(int, const char *, ...) NORETURN;
1288 ash_msg_and_raise(int cond, const char *msg, ...)
1293 ash_vmsg_and_raise(cond, msg, ap);
1299 * error/warning routines for external builtins
1302 ash_msg(const char *fmt, ...)
1312 * Return a string describing an error. The returned string may be a
1313 * pointer to a static buffer that will be overwritten on the next call.
1314 * Action describes the operation that got the error.
1317 errmsg(int e, const char *em)
1319 if (e == ENOENT || e == ENOTDIR) {
1326 /* ============ Memory allocation */
1329 /* I consider these wrappers nearly useless:
1330 * ok, they return you to nearest exception handler, but
1331 * how much memory do you leak in the process, making
1332 * memory starvation worse?
1335 ckrealloc(void * p, size_t nbytes)
1337 p = realloc(p, nbytes);
1339 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1344 ckmalloc(size_t nbytes)
1346 return ckrealloc(NULL, nbytes);
1350 ckzalloc(size_t nbytes)
1352 return memset(ckmalloc(nbytes), 0, nbytes);
1356 ckstrdup(const char *s)
1358 char *p = strdup(s);
1360 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1364 /* Using bbox equivalents. They exit if out of memory */
1365 # define ckrealloc xrealloc
1366 # define ckmalloc xmalloc
1367 # define ckzalloc xzalloc
1368 # define ckstrdup xstrdup
1372 * It appears that grabstackstr() will barf with such alignments
1373 * because stalloc() will return a string allocated in a new stackblock.
1375 #define SHELL_ALIGN(nbytes) (((nbytes) + SHELL_SIZE) & ~SHELL_SIZE)
1377 /* Most machines require the value returned from malloc to be aligned
1378 * in some way. The following macro will get this right
1379 * on many machines. */
1380 SHELL_SIZE = sizeof(union { int i; char *cp; double d; }) - 1,
1381 /* Minimum size of a block */
1382 MINSIZE = SHELL_ALIGN(504),
1385 struct stack_block {
1386 struct stack_block *prev;
1387 char space[MINSIZE];
1391 struct stack_block *stackp;
1397 struct globals_memstack {
1398 struct stack_block *g_stackp; // = &stackbase;
1399 char *g_stacknxt; // = stackbase.space;
1400 char *sstrend; // = stackbase.space + MINSIZE;
1401 size_t g_stacknleft; // = MINSIZE;
1402 struct stack_block stackbase;
1404 extern struct globals_memstack *const ash_ptr_to_globals_memstack;
1405 #define G_memstack (*ash_ptr_to_globals_memstack)
1406 #define g_stackp (G_memstack.g_stackp )
1407 #define g_stacknxt (G_memstack.g_stacknxt )
1408 #define sstrend (G_memstack.sstrend )
1409 #define g_stacknleft (G_memstack.g_stacknleft)
1410 #define stackbase (G_memstack.stackbase )
1411 #define INIT_G_memstack() do { \
1412 (*(struct globals_memstack**)&ash_ptr_to_globals_memstack) = xzalloc(sizeof(G_memstack)); \
1414 g_stackp = &stackbase; \
1415 g_stacknxt = stackbase.space; \
1416 g_stacknleft = MINSIZE; \
1417 sstrend = stackbase.space + MINSIZE; \
1421 #define stackblock() ((void *)g_stacknxt)
1422 #define stackblocksize() g_stacknleft
1425 * Parse trees for commands are allocated in lifo order, so we use a stack
1426 * to make this more efficient, and also to avoid all sorts of exception
1427 * handling code to handle interrupts in the middle of a parse.
1429 * The size 504 was chosen because the Ultrix malloc handles that size
1433 stalloc(size_t nbytes)
1438 aligned = SHELL_ALIGN(nbytes);
1439 if (aligned > g_stacknleft) {
1442 struct stack_block *sp;
1444 blocksize = aligned;
1445 if (blocksize < MINSIZE)
1446 blocksize = MINSIZE;
1447 len = sizeof(struct stack_block) - MINSIZE + blocksize;
1448 if (len < blocksize)
1449 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1452 sp->prev = g_stackp;
1453 g_stacknxt = sp->space;
1454 g_stacknleft = blocksize;
1455 sstrend = g_stacknxt + blocksize;
1460 g_stacknxt += aligned;
1461 g_stacknleft -= aligned;
1466 stzalloc(size_t nbytes)
1468 return memset(stalloc(nbytes), 0, nbytes);
1475 if (!p || (g_stacknxt < (char *)p) || ((char *)p < g_stackp->space)) {
1476 write(STDERR_FILENO, "stunalloc\n", 10);
1480 g_stacknleft += g_stacknxt - (char *)p;
1485 * Like strdup but works with the ash stack.
1488 sstrdup(const char *p)
1490 size_t len = strlen(p) + 1;
1491 return memcpy(stalloc(len), p, len);
1495 grabstackblock(size_t len)
1501 pushstackmark(struct stackmark *mark, size_t len)
1503 mark->stackp = g_stackp;
1504 mark->stacknxt = g_stacknxt;
1505 mark->stacknleft = g_stacknleft;
1506 grabstackblock(len);
1510 setstackmark(struct stackmark *mark)
1512 pushstackmark(mark, g_stacknxt == g_stackp->space && g_stackp != &stackbase);
1516 popstackmark(struct stackmark *mark)
1518 struct stack_block *sp;
1524 while (g_stackp != mark->stackp) {
1526 g_stackp = sp->prev;
1529 g_stacknxt = mark->stacknxt;
1530 g_stacknleft = mark->stacknleft;
1531 sstrend = mark->stacknxt + mark->stacknleft;
1536 * When the parser reads in a string, it wants to stick the string on the
1537 * stack and only adjust the stack pointer when it knows how big the
1538 * string is. Stackblock (defined in stack.h) returns a pointer to a block
1539 * of space on top of the stack and stackblocklen returns the length of
1540 * this block. Growstackblock will grow this space by at least one byte,
1541 * possibly moving it (like realloc). Grabstackblock actually allocates the
1542 * part of the block that has been used.
1545 growstackblock(void)
1549 newlen = g_stacknleft * 2;
1550 if (newlen < g_stacknleft)
1551 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1555 if (g_stacknxt == g_stackp->space && g_stackp != &stackbase) {
1556 struct stack_block *sp;
1557 struct stack_block *prevstackp;
1562 prevstackp = sp->prev;
1563 grosslen = newlen + sizeof(struct stack_block) - MINSIZE;
1564 sp = ckrealloc(sp, grosslen);
1565 sp->prev = prevstackp;
1567 g_stacknxt = sp->space;
1568 g_stacknleft = newlen;
1569 sstrend = sp->space + newlen;
1572 char *oldspace = g_stacknxt;
1573 size_t oldlen = g_stacknleft;
1574 char *p = stalloc(newlen);
1576 /* free the space we just allocated */
1577 g_stacknxt = memcpy(p, oldspace, oldlen);
1578 g_stacknleft += newlen;
1583 * The following routines are somewhat easier to use than the above.
1584 * The user declares a variable of type STACKSTR, which may be declared
1585 * to be a register. The macro STARTSTACKSTR initializes things. Then
1586 * the user uses the macro STPUTC to add characters to the string. In
1587 * effect, STPUTC(c, p) is the same as *p++ = c except that the stack is
1588 * grown as necessary. When the user is done, she can just leave the
1589 * string there and refer to it using stackblock(). Or she can allocate
1590 * the space for it using grabstackstr(). If it is necessary to allow
1591 * someone else to use the stack temporarily and then continue to grow
1592 * the string, the user should use grabstack to allocate the space, and
1593 * then call ungrabstr(p) to return to the previous mode of operation.
1595 * USTPUTC is like STPUTC except that it doesn't check for overflow.
1596 * CHECKSTACKSPACE can be called before USTPUTC to ensure that there
1597 * is space for at least one character.
1602 size_t len = stackblocksize();
1604 return (char *)stackblock() + len;
1608 * Called from CHECKSTRSPACE.
1611 makestrspace(size_t newlen, char *p)
1613 size_t len = p - g_stacknxt;
1619 size = stackblocksize();
1621 if (nleft >= newlen)
1625 return (char *)stackblock() + len;
1629 stack_nputstr(const char *s, size_t n, char *p)
1631 p = makestrspace(n, p);
1632 p = (char *)memcpy(p, s, n) + n;
1637 stack_putstr(const char *s, char *p)
1639 return stack_nputstr(s, strlen(s), p);
1643 _STPUTC(int c, char *p)
1651 #define STARTSTACKSTR(p) ((p) = stackblock())
1652 #define STPUTC(c, p) ((p) = _STPUTC((c), (p)))
1653 #define CHECKSTRSPACE(n, p) do { \
1656 size_t m = sstrend - q; \
1658 (p) = makestrspace(l, q); \
1660 #define USTPUTC(c, p) (*(p)++ = (c))
1661 #define STACKSTRNUL(p) do { \
1662 if ((p) == sstrend) \
1663 (p) = growstackstr(); \
1666 #define STUNPUTC(p) (--(p))
1667 #define STTOPC(p) ((p)[-1])
1668 #define STADJUST(amount, p) ((p) += (amount))
1670 #define grabstackstr(p) stalloc((char *)(p) - (char *)stackblock())
1671 #define ungrabstackstr(s, p) stunalloc(s)
1672 #define stackstrend() ((void *)sstrend)
1675 /* ============ String helpers */
1678 * prefix -- see if pfx is a prefix of string.
1681 prefix(const char *string, const char *pfx)
1684 if (*pfx++ != *string++)
1687 return (char *) string;
1691 * Check for a valid number. This should be elsewhere.
1694 is_number(const char *p)
1699 } while (*++p != '\0');
1704 * Convert a string of digits to an integer, printing an error message on
1708 number(const char *s)
1711 ash_msg_and_raise_error(msg_illnum, s);
1716 * Produce a possibly single quoted string suitable as input to the shell.
1717 * The return string is allocated on the stack.
1720 single_quote(const char *s)
1730 len = strchrnul(s, '\'') - s;
1732 q = p = makestrspace(len + 3, p);
1735 q = (char *)memcpy(q, s, len) + len;
1744 do len++; while (*++s == '\'');
1746 q = p = makestrspace(len + 3, p);
1749 q = (char *)memcpy(q, s - len, len) + len;
1757 return stackblock();
1761 /* ============ nextopt */
1763 static char **argptr; /* argument list for builtin commands */
1764 static char *optionarg; /* set by nextopt (like getopt) */
1765 static char *optptr; /* used by nextopt */
1768 * XXX - should get rid of. Have all builtins use getopt(3).
1769 * The library getopt must have the BSD extension static variable
1770 * "optreset", otherwise it can't be used within the shell safely.
1772 * Standard option processing (a la getopt) for builtin routines.
1773 * The only argument that is passed to nextopt is the option string;
1774 * the other arguments are unnecessary. It returns the character,
1775 * or '\0' on end of input.
1778 nextopt(const char *optstring)
1785 if (p == NULL || *p == '\0') {
1786 /* We ate entire "-param", take next one */
1792 if (*++p == '\0') /* just "-" ? */
1795 if (LONE_DASH(p)) /* "--" ? */
1797 /* p => next "-param" */
1799 /* p => some option char in the middle of a "-param" */
1801 for (q = optstring; *q != c;) {
1803 ash_msg_and_raise_error("illegal option -%c", c);
1811 ash_msg_and_raise_error("no arg for -%c option", c);
1821 /* ============ Shell variables */
1824 * The parsefile structure pointed to by the global variable parsefile
1825 * contains information about the current file being read.
1828 int nparam; /* # of positional parameters (without $0) */
1829 #if ENABLE_ASH_GETOPTS
1830 int optind; /* next parameter to be processed by getopts */
1831 int optoff; /* used by getopts */
1833 unsigned char malloced; /* if parameter list dynamically allocated */
1834 char **p; /* parameter list */
1838 * Free the list of positional parameters.
1841 freeparam(volatile struct shparam *param)
1843 if (param->malloced) {
1845 ap = ap1 = param->p;
1852 #if ENABLE_ASH_GETOPTS
1853 static void FAST_FUNC getoptsreset(const char *value);
1857 struct var *next; /* next entry in hash list */
1858 int flags; /* flags are defined above */
1859 const char *var_text; /* name=value */
1860 void (*var_func)(const char *) FAST_FUNC; /* function to be called when */
1861 /* the variable gets set/unset */
1865 struct localvar *next; /* next local variable in list */
1866 struct var *vp; /* the variable that was made local */
1867 int flags; /* saved flags */
1868 const char *text; /* saved text */
1872 #define VEXPORT 0x01 /* variable is exported */
1873 #define VREADONLY 0x02 /* variable cannot be modified */
1874 #define VSTRFIXED 0x04 /* variable struct is statically allocated */
1875 #define VTEXTFIXED 0x08 /* text is statically allocated */
1876 #define VSTACK 0x10 /* text is allocated on the stack */
1877 #define VUNSET 0x20 /* the variable is not set */
1878 #define VNOFUNC 0x40 /* don't call the callback function */
1879 #define VNOSET 0x80 /* do not set variable - just readonly test */
1880 #define VNOSAVE 0x100 /* when text is on the heap before setvareq */
1881 #if ENABLE_ASH_RANDOM_SUPPORT
1882 # define VDYNAMIC 0x200 /* dynamic variable */
1888 /* Need to be before varinit_data[] */
1889 #if ENABLE_LOCALE_SUPPORT
1890 static void FAST_FUNC
1891 change_lc_all(const char *value)
1893 if (value && *value != '\0')
1894 setlocale(LC_ALL, value);
1896 static void FAST_FUNC
1897 change_lc_ctype(const char *value)
1899 if (value && *value != '\0')
1900 setlocale(LC_CTYPE, value);
1904 static void chkmail(void);
1905 static void changemail(const char *var_value) FAST_FUNC;
1907 # define chkmail() ((void)0)
1909 static void changepath(const char *) FAST_FUNC;
1910 #if ENABLE_ASH_RANDOM_SUPPORT
1911 static void change_random(const char *) FAST_FUNC;
1914 static const struct {
1916 const char *var_text;
1917 void (*var_func)(const char *) FAST_FUNC;
1918 } varinit_data[] = {
1920 * Note: VEXPORT would not work correctly here for NOFORK applets:
1921 * some environment strings may be constant.
1923 { VSTRFIXED|VTEXTFIXED , defifsvar , NULL },
1925 { VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL" , changemail },
1926 { VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH" , changemail },
1928 { VSTRFIXED|VTEXTFIXED , bb_PATH_root_path, changepath },
1929 { VSTRFIXED|VTEXTFIXED , "PS1=$ " , NULL },
1930 { VSTRFIXED|VTEXTFIXED , "PS2=> " , NULL },
1931 { VSTRFIXED|VTEXTFIXED , "PS4=+ " , NULL },
1932 #if ENABLE_ASH_GETOPTS
1933 { VSTRFIXED|VTEXTFIXED , defoptindvar, getoptsreset },
1935 #if ENABLE_ASH_RANDOM_SUPPORT
1936 { VSTRFIXED|VTEXTFIXED|VUNSET|VDYNAMIC, "RANDOM", change_random },
1938 #if ENABLE_LOCALE_SUPPORT
1939 { VSTRFIXED|VTEXTFIXED|VUNSET, "LC_ALL" , change_lc_all },
1940 { VSTRFIXED|VTEXTFIXED|VUNSET, "LC_CTYPE" , change_lc_ctype },
1942 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
1943 { VSTRFIXED|VTEXTFIXED|VUNSET, "HISTFILE" , NULL },
1949 struct globals_var {
1950 struct shparam shellparam; /* $@ current positional parameters */
1951 struct redirtab *redirlist;
1952 int preverrout_fd; /* save fd2 before print debug if xflag is set. */
1953 struct var *vartab[VTABSIZE];
1954 struct var varinit[ARRAY_SIZE(varinit_data)];
1956 extern struct globals_var *const ash_ptr_to_globals_var;
1957 #define G_var (*ash_ptr_to_globals_var)
1958 #define shellparam (G_var.shellparam )
1959 //#define redirlist (G_var.redirlist )
1960 #define preverrout_fd (G_var.preverrout_fd)
1961 #define vartab (G_var.vartab )
1962 #define varinit (G_var.varinit )
1963 #define INIT_G_var() do { \
1965 (*(struct globals_var**)&ash_ptr_to_globals_var) = xzalloc(sizeof(G_var)); \
1967 for (i = 0; i < ARRAY_SIZE(varinit_data); i++) { \
1968 varinit[i].flags = varinit_data[i].flags; \
1969 varinit[i].var_text = varinit_data[i].var_text; \
1970 varinit[i].var_func = varinit_data[i].var_func; \
1974 #define vifs varinit[0]
1976 # define vmail (&vifs)[1]
1977 # define vmpath (&vmail)[1]
1978 # define vpath (&vmpath)[1]
1980 # define vpath (&vifs)[1]
1982 #define vps1 (&vpath)[1]
1983 #define vps2 (&vps1)[1]
1984 #define vps4 (&vps2)[1]
1985 #if ENABLE_ASH_GETOPTS
1986 # define voptind (&vps4)[1]
1987 # if ENABLE_ASH_RANDOM_SUPPORT
1988 # define vrandom (&voptind)[1]
1991 # if ENABLE_ASH_RANDOM_SUPPORT
1992 # define vrandom (&vps4)[1]
1997 * The following macros access the values of the above variables.
1998 * They have to skip over the name. They return the null string
1999 * for unset variables.
2001 #define ifsval() (vifs.var_text + 4)
2002 #define ifsset() ((vifs.flags & VUNSET) == 0)
2004 # define mailval() (vmail.var_text + 5)
2005 # define mpathval() (vmpath.var_text + 9)
2006 # define mpathset() ((vmpath.flags & VUNSET) == 0)
2008 #define pathval() (vpath.var_text + 5)
2009 #define ps1val() (vps1.var_text + 4)
2010 #define ps2val() (vps2.var_text + 4)
2011 #define ps4val() (vps4.var_text + 4)
2012 #if ENABLE_ASH_GETOPTS
2013 # define optindval() (voptind.var_text + 7)
2016 #if ENABLE_ASH_GETOPTS
2017 static void FAST_FUNC
2018 getoptsreset(const char *value)
2020 shellparam.optind = number(value) ?: 1;
2021 shellparam.optoff = -1;
2026 * Compares two strings up to the first = or '\0'. The first
2027 * string must be terminated by '='; the second may be terminated by
2028 * either '=' or '\0'.
2031 varcmp(const char *p, const char *q)
2035 while ((c = *p) == (d = *q)) {
2036 if (c == '\0' || c == '=')
2050 * Find the appropriate entry in the hash table from the name.
2052 static struct var **
2053 hashvar(const char *p)
2057 hashval = ((unsigned char) *p) << 4;
2058 while (*p && *p != '=')
2059 hashval += (unsigned char) *p++;
2060 return &vartab[hashval % VTABSIZE];
2064 vpcmp(const void *a, const void *b)
2066 return varcmp(*(const char **)a, *(const char **)b);
2070 * This routine initializes the builtin variables.
2080 * PS1 depends on uid
2082 #if ENABLE_FEATURE_EDITING && ENABLE_FEATURE_EDITING_FANCY_PROMPT
2083 vps1.var_text = "PS1=\\w \\$ ";
2086 vps1.var_text = "PS1=# ";
2089 end = vp + ARRAY_SIZE(varinit);
2091 vpp = hashvar(vp->var_text);
2094 } while (++vp < end);
2097 static struct var **
2098 findvar(struct var **vpp, const char *name)
2100 for (; *vpp; vpp = &(*vpp)->next) {
2101 if (varcmp((*vpp)->var_text, name) == 0) {
2109 * Find the value of a variable. Returns NULL if not set.
2111 static const char* FAST_FUNC
2112 lookupvar(const char *name)
2116 v = *findvar(hashvar(name), name);
2118 #if ENABLE_ASH_RANDOM_SUPPORT
2120 * Dynamic variables are implemented roughly the same way they are
2121 * in bash. Namely, they're "special" so long as they aren't unset.
2122 * As soon as they're unset, they're no longer dynamic, and dynamic
2123 * lookup will no longer happen at that point. -- PFM.
2125 if (v->flags & VDYNAMIC)
2128 if (!(v->flags & VUNSET))
2129 return var_end(v->var_text);
2135 reinit_unicode_for_ash(void)
2137 /* Unicode support should be activated even if LANG is set
2138 * _during_ shell execution, not only if it was set when
2139 * shell was started. Therefore, re-check LANG every time:
2141 if (ENABLE_FEATURE_CHECK_UNICODE_IN_ENV
2142 || ENABLE_UNICODE_USING_LOCALE
2144 const char *s = lookupvar("LC_ALL");
2145 if (!s) s = lookupvar("LC_CTYPE");
2146 if (!s) s = lookupvar("LANG");
2152 * Search the environment of a builtin command.
2155 bltinlookup(const char *name)
2159 for (sp = cmdenviron; sp; sp = sp->next) {
2160 if (varcmp(sp->text, name) == 0)
2161 return var_end(sp->text);
2163 return lookupvar(name);
2167 * Same as setvar except that the variable and value are passed in
2168 * the first argument as name=value. Since the first argument will
2169 * be actually stored in the table, it should not be a string that
2171 * Called with interrupts off.
2174 setvareq(char *s, int flags)
2176 struct var *vp, **vpp;
2179 flags |= (VEXPORT & (((unsigned) (1 - aflag)) - 1));
2180 vp = *findvar(vpp, s);
2182 if ((vp->flags & (VREADONLY|VDYNAMIC)) == VREADONLY) {
2185 if (flags & VNOSAVE)
2188 ash_msg_and_raise_error("%.*s: is read only", strchrnul(n, '=') - n, n);
2194 if (vp->var_func && !(flags & VNOFUNC))
2195 vp->var_func(var_end(s));
2197 if (!(vp->flags & (VTEXTFIXED|VSTACK)))
2198 free((char*)vp->var_text);
2200 flags |= vp->flags & ~(VTEXTFIXED|VSTACK|VNOSAVE|VUNSET);
2202 /* variable s is not found */
2205 vp = ckzalloc(sizeof(*vp));
2207 /*vp->func = NULL; - ckzalloc did it */
2210 if (!(flags & (VTEXTFIXED|VSTACK|VNOSAVE)))
2217 * Set the value of a variable. The flags argument is ored with the
2218 * flags of the variable. If val is NULL, the variable is unset.
2221 setvar(const char *name, const char *val, int flags)
2229 q = endofname(name);
2230 p = strchrnul(q, '=');
2232 if (!namelen || p != q)
2233 ash_msg_and_raise_error("%.*s: bad variable name", namelen, name);
2238 vallen = strlen(val);
2242 nameeq = ckmalloc(namelen + vallen + 2);
2243 p = memcpy(nameeq, name, namelen) + namelen;
2246 p = memcpy(p, val, vallen) + vallen;
2249 setvareq(nameeq, flags | VNOSAVE);
2253 static void FAST_FUNC
2254 setvar0(const char *name, const char *val)
2256 setvar(name, val, 0);
2260 * Unset the specified variable.
2263 unsetvar(const char *s)
2269 vpp = findvar(hashvar(s), s);
2273 int flags = vp->flags;
2276 if (flags & VREADONLY)
2278 #if ENABLE_ASH_RANDOM_SUPPORT
2279 vp->flags &= ~VDYNAMIC;
2283 if ((flags & VSTRFIXED) == 0) {
2285 if ((flags & (VTEXTFIXED|VSTACK)) == 0)
2286 free((char*)vp->var_text);
2292 vp->flags &= ~VEXPORT;
2302 * Process a linked list of variable assignments.
2305 listsetvar(struct strlist *list_set_var, int flags)
2307 struct strlist *lp = list_set_var;
2313 setvareq(lp->text, flags);
2320 * Generate a list of variables satisfying the given conditions.
2323 listvars(int on, int off, char ***end)
2334 for (vp = *vpp; vp; vp = vp->next) {
2335 if ((vp->flags & mask) == on) {
2336 if (ep == stackstrend())
2337 ep = growstackstr();
2338 *ep++ = (char*)vp->var_text;
2341 } while (++vpp < vartab + VTABSIZE);
2342 if (ep == stackstrend())
2343 ep = growstackstr();
2347 return grabstackstr(ep);
2351 /* ============ Path search helper
2353 * The variable path (passed by reference) should be set to the start
2354 * of the path before the first call; path_advance will update
2355 * this value as it proceeds. Successive calls to path_advance will return
2356 * the possible path expansions in sequence. If an option (indicated by
2357 * a percent sign) appears in the path entry then the global variable
2358 * pathopt will be set to point to it; otherwise pathopt will be set to
2361 static const char *pathopt; /* set by path_advance */
2364 path_advance(const char **path, const char *name)
2374 for (p = start; *p && *p != ':' && *p != '%'; p++)
2376 len = p - start + strlen(name) + 2; /* "2" is for '/' and '\0' */
2377 while (stackblocksize() < len)
2381 memcpy(q, start, p - start);
2389 while (*p && *p != ':')
2396 return stalloc(len);
2400 /* ============ Prompt */
2402 static smallint doprompt; /* if set, prompt the user */
2403 static smallint needprompt; /* true if interactive and at start of line */
2405 #if ENABLE_FEATURE_EDITING
2406 static line_input_t *line_input_state;
2407 static const char *cmdedit_prompt;
2409 putprompt(const char *s)
2411 if (ENABLE_ASH_EXPAND_PRMT) {
2412 free((char*)cmdedit_prompt);
2413 cmdedit_prompt = ckstrdup(s);
2420 putprompt(const char *s)
2426 #if ENABLE_ASH_EXPAND_PRMT
2427 /* expandstr() needs parsing machinery, so it is far away ahead... */
2428 static const char *expandstr(const char *ps);
2430 #define expandstr(s) s
2434 setprompt_if(smallint do_set, int whichprompt)
2437 IF_ASH_EXPAND_PRMT(struct stackmark smark;)
2444 switch (whichprompt) {
2454 #if ENABLE_ASH_EXPAND_PRMT
2455 pushstackmark(&smark, stackblocksize());
2457 putprompt(expandstr(prompt));
2458 #if ENABLE_ASH_EXPAND_PRMT
2459 popstackmark(&smark);
2464 /* ============ The cd and pwd commands */
2466 #define CD_PHYSICAL 1
2476 while ((i = nextopt("LP")) != '\0') {
2478 flags ^= CD_PHYSICAL;
2487 * Update curdir (the name of the current directory) in response to a
2491 updatepwd(const char *dir)
2498 cdcomppath = sstrdup(dir);
2501 if (curdir == nullstr)
2503 new = stack_putstr(curdir, new);
2505 new = makestrspace(strlen(dir) + 2, new);
2506 lim = (char *)stackblock() + 1;
2510 if (new > lim && *lim == '/')
2515 if (dir[1] == '/' && dir[2] != '/') {
2521 p = strtok(cdcomppath, "/");
2525 if (p[1] == '.' && p[2] == '\0') {
2537 new = stack_putstr(p, new);
2540 p = strtok(NULL, "/");
2545 return stackblock();
2549 * Find out what the current directory is. If we already know the current
2550 * directory, this routine returns immediately.
2555 char *dir = getcwd(NULL, 0); /* huh, using glibc extension? */
2556 return dir ? dir : nullstr;
2560 setpwd(const char *val, int setold)
2564 oldcur = dir = curdir;
2567 setvar("OLDPWD", oldcur, VEXPORT);
2570 if (physdir != nullstr) {
2571 if (physdir != oldcur)
2575 if (oldcur == val || !val) {
2581 dir = ckstrdup(val);
2582 if (oldcur != dir && oldcur != nullstr) {
2587 setvar("PWD", dir, VEXPORT);
2590 static void hashcd(void);
2593 * Actually do the chdir. We also call hashcd to let the routines in exec.c
2594 * know that the current directory has changed.
2597 docd(const char *dest, int flags)
2599 const char *dir = NULL;
2602 TRACE(("docd(\"%s\", %d) called\n", dest, flags));
2605 if (!(flags & CD_PHYSICAL)) {
2606 dir = updatepwd(dest);
2620 static int FAST_FUNC
2621 cdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
2633 dest = bltinlookup("HOME");
2634 else if (LONE_DASH(dest)) {
2635 dest = bltinlookup("OLDPWD");
2657 path = bltinlookup("CDPATH");
2660 p = path_advance(&path, dest);
2661 if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
2665 if (!docd(p, flags))
2676 ash_msg_and_raise_error("can't cd to %s", dest);
2679 if (flags & CD_PRINT)
2680 out1fmt("%s\n", curdir);
2684 static int FAST_FUNC
2685 pwdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
2688 const char *dir = curdir;
2692 if (physdir == nullstr)
2696 out1fmt("%s\n", dir);
2701 /* ============ ... */
2704 #define IBUFSIZ (ENABLE_FEATURE_EDITING ? CONFIG_FEATURE_EDITING_MAX_LEN : 1024)
2706 /* Syntax classes */
2707 #define CWORD 0 /* character is nothing special */
2708 #define CNL 1 /* newline character */
2709 #define CBACK 2 /* a backslash character */
2710 #define CSQUOTE 3 /* single quote */
2711 #define CDQUOTE 4 /* double quote */
2712 #define CENDQUOTE 5 /* a terminating quote */
2713 #define CBQUOTE 6 /* backwards single quote */
2714 #define CVAR 7 /* a dollar sign */
2715 #define CENDVAR 8 /* a '}' character */
2716 #define CLP 9 /* a left paren in arithmetic */
2717 #define CRP 10 /* a right paren in arithmetic */
2718 #define CENDFILE 11 /* end of file */
2719 #define CCTL 12 /* like CWORD, except it must be escaped */
2720 #define CSPCL 13 /* these terminate a word */
2721 #define CIGN 14 /* character should be ignored */
2724 #if ENABLE_ASH_ALIAS
2728 #define USE_SIT_FUNCTION ENABLE_ASH_OPTIMIZE_FOR_SIZE
2730 #if ENABLE_SH_MATH_SUPPORT
2731 # define SIT_ITEM(a,b,c,d) (a | (b << 4) | (c << 8) | (d << 12))
2733 # define SIT_ITEM(a,b,c,d) (a | (b << 4) | (c << 8))
2735 static const uint16_t S_I_T[] ALIGN2 = {
2736 #if ENABLE_ASH_ALIAS
2737 SIT_ITEM(CSPCL , CIGN , CIGN , CIGN ), /* 0, PEOA */
2739 SIT_ITEM(CSPCL , CWORD , CWORD, CWORD ), /* 1, ' ' */
2740 SIT_ITEM(CNL , CNL , CNL , CNL ), /* 2, \n */
2741 SIT_ITEM(CWORD , CCTL , CCTL , CWORD ), /* 3, !*-/:=?[]~ */
2742 SIT_ITEM(CDQUOTE , CENDQUOTE, CWORD, CWORD ), /* 4, '"' */
2743 SIT_ITEM(CVAR , CVAR , CWORD, CVAR ), /* 5, $ */
2744 SIT_ITEM(CSQUOTE , CWORD , CENDQUOTE, CWORD), /* 6, "'" */
2745 SIT_ITEM(CSPCL , CWORD , CWORD, CLP ), /* 7, ( */
2746 SIT_ITEM(CSPCL , CWORD , CWORD, CRP ), /* 8, ) */
2747 SIT_ITEM(CBACK , CBACK , CCTL , CBACK ), /* 9, \ */
2748 SIT_ITEM(CBQUOTE , CBQUOTE , CWORD, CBQUOTE), /* 10, ` */
2749 SIT_ITEM(CENDVAR , CENDVAR , CWORD, CENDVAR), /* 11, } */
2750 #if !USE_SIT_FUNCTION
2751 SIT_ITEM(CENDFILE, CENDFILE , CENDFILE, CENDFILE),/* 12, PEOF */
2752 SIT_ITEM(CWORD , CWORD , CWORD, CWORD ), /* 13, 0-9A-Za-z */
2753 SIT_ITEM(CCTL , CCTL , CCTL , CCTL ) /* 14, CTLESC ... */
2757 /* Constants below must match table above */
2759 #if ENABLE_ASH_ALIAS
2760 CSPCL_CIGN_CIGN_CIGN , /* 0 */
2762 CSPCL_CWORD_CWORD_CWORD , /* 1 */
2763 CNL_CNL_CNL_CNL , /* 2 */
2764 CWORD_CCTL_CCTL_CWORD , /* 3 */
2765 CDQUOTE_CENDQUOTE_CWORD_CWORD , /* 4 */
2766 CVAR_CVAR_CWORD_CVAR , /* 5 */
2767 CSQUOTE_CWORD_CENDQUOTE_CWORD , /* 6 */
2768 CSPCL_CWORD_CWORD_CLP , /* 7 */
2769 CSPCL_CWORD_CWORD_CRP , /* 8 */
2770 CBACK_CBACK_CCTL_CBACK , /* 9 */
2771 CBQUOTE_CBQUOTE_CWORD_CBQUOTE , /* 10 */
2772 CENDVAR_CENDVAR_CWORD_CENDVAR , /* 11 */
2773 CENDFILE_CENDFILE_CENDFILE_CENDFILE, /* 12 */
2774 CWORD_CWORD_CWORD_CWORD , /* 13 */
2775 CCTL_CCTL_CCTL_CCTL , /* 14 */
2778 /* c in SIT(c, syntax) must be an *unsigned char* or PEOA or PEOF,
2779 * caller must ensure proper cast on it if c is *char_ptr!
2781 /* Values for syntax param */
2782 #define BASESYNTAX 0 /* not in quotes */
2783 #define DQSYNTAX 1 /* in double quotes */
2784 #define SQSYNTAX 2 /* in single quotes */
2785 #define ARISYNTAX 3 /* in arithmetic */
2786 #define PSSYNTAX 4 /* prompt. never passed to SIT() */
2788 #if USE_SIT_FUNCTION
2791 SIT(int c, int syntax)
2793 /* Used to also have '/' in this string: "\t\n !\"$&'()*-/:;<=>?[\\]`|}~" */
2794 static const char spec_symbls[] ALIGN1 = "\t\n !\"$&'()*-:;<=>?[\\]`|}~";
2796 * This causes '/' to be prepended with CTLESC in dquoted string,
2797 * making "./file"* treated incorrectly because we feed
2798 * ".\/file*" string to glob(), confusing it (see expandmeta func).
2799 * The "homegrown" glob implementation is okay with that,
2800 * but glibc one isn't. With '/' always treated as CWORD,
2803 # if ENABLE_ASH_ALIAS
2804 static const uint8_t syntax_index_table[] ALIGN1 = {
2805 1, 2, 1, 3, 4, 5, 1, 6, /* "\t\n !\"$&'" */
2806 7, 8, 3, 3,/*3,*/3, 1, 1, /* "()*-/:;<" */
2807 3, 1, 3, 3, 9, 3, 10, 1, /* "=>?[\\]`|" */
2811 static const uint8_t syntax_index_table[] ALIGN1 = {
2812 0, 1, 0, 2, 3, 4, 0, 5, /* "\t\n !\"$&'" */
2813 6, 7, 2, 2,/*2,*/2, 0, 0, /* "()*-/:;<" */
2814 2, 0, 2, 2, 8, 2, 9, 0, /* "=>?[\\]`|" */
2823 # if ENABLE_ASH_ALIAS
2829 /* Cast is purely for paranoia here,
2830 * just in case someone passed signed char to us */
2831 if ((unsigned char)c >= CTL_FIRST
2832 && (unsigned char)c <= CTL_LAST
2836 s = strchrnul(spec_symbls, c);
2839 indx = syntax_index_table[s - spec_symbls];
2841 return (S_I_T[indx] >> (syntax*4)) & 0xf;
2844 #else /* !USE_SIT_FUNCTION */
2846 static const uint8_t syntax_index_table[] ALIGN1 = {
2847 /* BASESYNTAX_DQSYNTAX_SQSYNTAX_ARISYNTAX */
2848 /* 0 */ CWORD_CWORD_CWORD_CWORD,
2849 /* 1 */ CWORD_CWORD_CWORD_CWORD,
2850 /* 2 */ CWORD_CWORD_CWORD_CWORD,
2851 /* 3 */ CWORD_CWORD_CWORD_CWORD,
2852 /* 4 */ CWORD_CWORD_CWORD_CWORD,
2853 /* 5 */ CWORD_CWORD_CWORD_CWORD,
2854 /* 6 */ CWORD_CWORD_CWORD_CWORD,
2855 /* 7 */ CWORD_CWORD_CWORD_CWORD,
2856 /* 8 */ CWORD_CWORD_CWORD_CWORD,
2857 /* 9 "\t" */ CSPCL_CWORD_CWORD_CWORD,
2858 /* 10 "\n" */ CNL_CNL_CNL_CNL,
2859 /* 11 */ CWORD_CWORD_CWORD_CWORD,
2860 /* 12 */ CWORD_CWORD_CWORD_CWORD,
2861 /* 13 */ CWORD_CWORD_CWORD_CWORD,
2862 /* 14 */ CWORD_CWORD_CWORD_CWORD,
2863 /* 15 */ CWORD_CWORD_CWORD_CWORD,
2864 /* 16 */ CWORD_CWORD_CWORD_CWORD,
2865 /* 17 */ CWORD_CWORD_CWORD_CWORD,
2866 /* 18 */ CWORD_CWORD_CWORD_CWORD,
2867 /* 19 */ CWORD_CWORD_CWORD_CWORD,
2868 /* 20 */ CWORD_CWORD_CWORD_CWORD,
2869 /* 21 */ CWORD_CWORD_CWORD_CWORD,
2870 /* 22 */ CWORD_CWORD_CWORD_CWORD,
2871 /* 23 */ CWORD_CWORD_CWORD_CWORD,
2872 /* 24 */ CWORD_CWORD_CWORD_CWORD,
2873 /* 25 */ CWORD_CWORD_CWORD_CWORD,
2874 /* 26 */ CWORD_CWORD_CWORD_CWORD,
2875 /* 27 */ CWORD_CWORD_CWORD_CWORD,
2876 /* 28 */ CWORD_CWORD_CWORD_CWORD,
2877 /* 29 */ CWORD_CWORD_CWORD_CWORD,
2878 /* 30 */ CWORD_CWORD_CWORD_CWORD,
2879 /* 31 */ CWORD_CWORD_CWORD_CWORD,
2880 /* 32 " " */ CSPCL_CWORD_CWORD_CWORD,
2881 /* 33 "!" */ CWORD_CCTL_CCTL_CWORD,
2882 /* 34 """ */ CDQUOTE_CENDQUOTE_CWORD_CWORD,
2883 /* 35 "#" */ CWORD_CWORD_CWORD_CWORD,
2884 /* 36 "$" */ CVAR_CVAR_CWORD_CVAR,
2885 /* 37 "%" */ CWORD_CWORD_CWORD_CWORD,
2886 /* 38 "&" */ CSPCL_CWORD_CWORD_CWORD,
2887 /* 39 "'" */ CSQUOTE_CWORD_CENDQUOTE_CWORD,
2888 /* 40 "(" */ CSPCL_CWORD_CWORD_CLP,
2889 /* 41 ")" */ CSPCL_CWORD_CWORD_CRP,
2890 /* 42 "*" */ CWORD_CCTL_CCTL_CWORD,
2891 /* 43 "+" */ CWORD_CWORD_CWORD_CWORD,
2892 /* 44 "," */ CWORD_CWORD_CWORD_CWORD,
2893 /* 45 "-" */ CWORD_CCTL_CCTL_CWORD,
2894 /* 46 "." */ CWORD_CWORD_CWORD_CWORD,
2895 /* "/" was CWORD_CCTL_CCTL_CWORD, see comment in SIT() function why this is changed: */
2896 /* 47 "/" */ CWORD_CWORD_CWORD_CWORD,
2897 /* 48 "0" */ CWORD_CWORD_CWORD_CWORD,
2898 /* 49 "1" */ CWORD_CWORD_CWORD_CWORD,
2899 /* 50 "2" */ CWORD_CWORD_CWORD_CWORD,
2900 /* 51 "3" */ CWORD_CWORD_CWORD_CWORD,
2901 /* 52 "4" */ CWORD_CWORD_CWORD_CWORD,
2902 /* 53 "5" */ CWORD_CWORD_CWORD_CWORD,
2903 /* 54 "6" */ CWORD_CWORD_CWORD_CWORD,
2904 /* 55 "7" */ CWORD_CWORD_CWORD_CWORD,
2905 /* 56 "8" */ CWORD_CWORD_CWORD_CWORD,
2906 /* 57 "9" */ CWORD_CWORD_CWORD_CWORD,
2907 /* 58 ":" */ CWORD_CCTL_CCTL_CWORD,
2908 /* 59 ";" */ CSPCL_CWORD_CWORD_CWORD,
2909 /* 60 "<" */ CSPCL_CWORD_CWORD_CWORD,
2910 /* 61 "=" */ CWORD_CCTL_CCTL_CWORD,
2911 /* 62 ">" */ CSPCL_CWORD_CWORD_CWORD,
2912 /* 63 "?" */ CWORD_CCTL_CCTL_CWORD,
2913 /* 64 "@" */ CWORD_CWORD_CWORD_CWORD,
2914 /* 65 "A" */ CWORD_CWORD_CWORD_CWORD,
2915 /* 66 "B" */ CWORD_CWORD_CWORD_CWORD,
2916 /* 67 "C" */ CWORD_CWORD_CWORD_CWORD,
2917 /* 68 "D" */ CWORD_CWORD_CWORD_CWORD,
2918 /* 69 "E" */ CWORD_CWORD_CWORD_CWORD,
2919 /* 70 "F" */ CWORD_CWORD_CWORD_CWORD,
2920 /* 71 "G" */ CWORD_CWORD_CWORD_CWORD,
2921 /* 72 "H" */ CWORD_CWORD_CWORD_CWORD,
2922 /* 73 "I" */ CWORD_CWORD_CWORD_CWORD,
2923 /* 74 "J" */ CWORD_CWORD_CWORD_CWORD,
2924 /* 75 "K" */ CWORD_CWORD_CWORD_CWORD,
2925 /* 76 "L" */ CWORD_CWORD_CWORD_CWORD,
2926 /* 77 "M" */ CWORD_CWORD_CWORD_CWORD,
2927 /* 78 "N" */ CWORD_CWORD_CWORD_CWORD,
2928 /* 79 "O" */ CWORD_CWORD_CWORD_CWORD,
2929 /* 80 "P" */ CWORD_CWORD_CWORD_CWORD,
2930 /* 81 "Q" */ CWORD_CWORD_CWORD_CWORD,
2931 /* 82 "R" */ CWORD_CWORD_CWORD_CWORD,
2932 /* 83 "S" */ CWORD_CWORD_CWORD_CWORD,
2933 /* 84 "T" */ CWORD_CWORD_CWORD_CWORD,
2934 /* 85 "U" */ CWORD_CWORD_CWORD_CWORD,
2935 /* 86 "V" */ CWORD_CWORD_CWORD_CWORD,
2936 /* 87 "W" */ CWORD_CWORD_CWORD_CWORD,
2937 /* 88 "X" */ CWORD_CWORD_CWORD_CWORD,
2938 /* 89 "Y" */ CWORD_CWORD_CWORD_CWORD,
2939 /* 90 "Z" */ CWORD_CWORD_CWORD_CWORD,
2940 /* 91 "[" */ CWORD_CCTL_CCTL_CWORD,
2941 /* 92 "\" */ CBACK_CBACK_CCTL_CBACK,
2942 /* 93 "]" */ CWORD_CCTL_CCTL_CWORD,
2943 /* 94 "^" */ CWORD_CWORD_CWORD_CWORD,
2944 /* 95 "_" */ CWORD_CWORD_CWORD_CWORD,
2945 /* 96 "`" */ CBQUOTE_CBQUOTE_CWORD_CBQUOTE,
2946 /* 97 "a" */ CWORD_CWORD_CWORD_CWORD,
2947 /* 98 "b" */ CWORD_CWORD_CWORD_CWORD,
2948 /* 99 "c" */ CWORD_CWORD_CWORD_CWORD,
2949 /* 100 "d" */ CWORD_CWORD_CWORD_CWORD,
2950 /* 101 "e" */ CWORD_CWORD_CWORD_CWORD,
2951 /* 102 "f" */ CWORD_CWORD_CWORD_CWORD,
2952 /* 103 "g" */ CWORD_CWORD_CWORD_CWORD,
2953 /* 104 "h" */ CWORD_CWORD_CWORD_CWORD,
2954 /* 105 "i" */ CWORD_CWORD_CWORD_CWORD,
2955 /* 106 "j" */ CWORD_CWORD_CWORD_CWORD,
2956 /* 107 "k" */ CWORD_CWORD_CWORD_CWORD,
2957 /* 108 "l" */ CWORD_CWORD_CWORD_CWORD,
2958 /* 109 "m" */ CWORD_CWORD_CWORD_CWORD,
2959 /* 110 "n" */ CWORD_CWORD_CWORD_CWORD,
2960 /* 111 "o" */ CWORD_CWORD_CWORD_CWORD,
2961 /* 112 "p" */ CWORD_CWORD_CWORD_CWORD,
2962 /* 113 "q" */ CWORD_CWORD_CWORD_CWORD,
2963 /* 114 "r" */ CWORD_CWORD_CWORD_CWORD,
2964 /* 115 "s" */ CWORD_CWORD_CWORD_CWORD,
2965 /* 116 "t" */ CWORD_CWORD_CWORD_CWORD,
2966 /* 117 "u" */ CWORD_CWORD_CWORD_CWORD,
2967 /* 118 "v" */ CWORD_CWORD_CWORD_CWORD,
2968 /* 119 "w" */ CWORD_CWORD_CWORD_CWORD,
2969 /* 120 "x" */ CWORD_CWORD_CWORD_CWORD,
2970 /* 121 "y" */ CWORD_CWORD_CWORD_CWORD,
2971 /* 122 "z" */ CWORD_CWORD_CWORD_CWORD,
2972 /* 123 "{" */ CWORD_CWORD_CWORD_CWORD,
2973 /* 124 "|" */ CSPCL_CWORD_CWORD_CWORD,
2974 /* 125 "}" */ CENDVAR_CENDVAR_CWORD_CENDVAR,
2975 /* 126 "~" */ CWORD_CCTL_CCTL_CWORD,
2976 /* 127 del */ CWORD_CWORD_CWORD_CWORD,
2977 /* 128 0x80 */ CWORD_CWORD_CWORD_CWORD,
2978 /* 129 CTLESC */ CCTL_CCTL_CCTL_CCTL,
2979 /* 130 CTLVAR */ CCTL_CCTL_CCTL_CCTL,
2980 /* 131 CTLENDVAR */ CCTL_CCTL_CCTL_CCTL,
2981 /* 132 CTLBACKQ */ CCTL_CCTL_CCTL_CCTL,
2982 /* 133 CTLQUOTE */ CCTL_CCTL_CCTL_CCTL,
2983 /* 134 CTLARI */ CCTL_CCTL_CCTL_CCTL,
2984 /* 135 CTLENDARI */ CCTL_CCTL_CCTL_CCTL,
2985 /* 136 CTLQUOTEMARK */ CCTL_CCTL_CCTL_CCTL,
2986 /* 137 */ CWORD_CWORD_CWORD_CWORD,
2987 /* 138 */ CWORD_CWORD_CWORD_CWORD,
2988 /* 139 */ CWORD_CWORD_CWORD_CWORD,
2989 /* 140 */ CWORD_CWORD_CWORD_CWORD,
2990 /* 141 */ CWORD_CWORD_CWORD_CWORD,
2991 /* 142 */ CWORD_CWORD_CWORD_CWORD,
2992 /* 143 */ CWORD_CWORD_CWORD_CWORD,
2993 /* 144 */ CWORD_CWORD_CWORD_CWORD,
2994 /* 145 */ CWORD_CWORD_CWORD_CWORD,
2995 /* 146 */ CWORD_CWORD_CWORD_CWORD,
2996 /* 147 */ CWORD_CWORD_CWORD_CWORD,
2997 /* 148 */ CWORD_CWORD_CWORD_CWORD,
2998 /* 149 */ CWORD_CWORD_CWORD_CWORD,
2999 /* 150 */ CWORD_CWORD_CWORD_CWORD,
3000 /* 151 */ CWORD_CWORD_CWORD_CWORD,
3001 /* 152 */ CWORD_CWORD_CWORD_CWORD,
3002 /* 153 */ CWORD_CWORD_CWORD_CWORD,
3003 /* 154 */ CWORD_CWORD_CWORD_CWORD,
3004 /* 155 */ CWORD_CWORD_CWORD_CWORD,
3005 /* 156 */ CWORD_CWORD_CWORD_CWORD,
3006 /* 157 */ CWORD_CWORD_CWORD_CWORD,
3007 /* 158 */ CWORD_CWORD_CWORD_CWORD,
3008 /* 159 */ CWORD_CWORD_CWORD_CWORD,
3009 /* 160 */ CWORD_CWORD_CWORD_CWORD,
3010 /* 161 */ CWORD_CWORD_CWORD_CWORD,
3011 /* 162 */ CWORD_CWORD_CWORD_CWORD,
3012 /* 163 */ CWORD_CWORD_CWORD_CWORD,
3013 /* 164 */ CWORD_CWORD_CWORD_CWORD,
3014 /* 165 */ CWORD_CWORD_CWORD_CWORD,
3015 /* 166 */ CWORD_CWORD_CWORD_CWORD,
3016 /* 167 */ CWORD_CWORD_CWORD_CWORD,
3017 /* 168 */ CWORD_CWORD_CWORD_CWORD,
3018 /* 169 */ CWORD_CWORD_CWORD_CWORD,
3019 /* 170 */ CWORD_CWORD_CWORD_CWORD,
3020 /* 171 */ CWORD_CWORD_CWORD_CWORD,
3021 /* 172 */ CWORD_CWORD_CWORD_CWORD,
3022 /* 173 */ CWORD_CWORD_CWORD_CWORD,
3023 /* 174 */ CWORD_CWORD_CWORD_CWORD,
3024 /* 175 */ CWORD_CWORD_CWORD_CWORD,
3025 /* 176 */ CWORD_CWORD_CWORD_CWORD,
3026 /* 177 */ CWORD_CWORD_CWORD_CWORD,
3027 /* 178 */ CWORD_CWORD_CWORD_CWORD,
3028 /* 179 */ CWORD_CWORD_CWORD_CWORD,
3029 /* 180 */ CWORD_CWORD_CWORD_CWORD,
3030 /* 181 */ CWORD_CWORD_CWORD_CWORD,
3031 /* 182 */ CWORD_CWORD_CWORD_CWORD,
3032 /* 183 */ CWORD_CWORD_CWORD_CWORD,
3033 /* 184 */ CWORD_CWORD_CWORD_CWORD,
3034 /* 185 */ CWORD_CWORD_CWORD_CWORD,
3035 /* 186 */ CWORD_CWORD_CWORD_CWORD,
3036 /* 187 */ CWORD_CWORD_CWORD_CWORD,
3037 /* 188 */ CWORD_CWORD_CWORD_CWORD,
3038 /* 189 */ CWORD_CWORD_CWORD_CWORD,
3039 /* 190 */ CWORD_CWORD_CWORD_CWORD,
3040 /* 191 */ CWORD_CWORD_CWORD_CWORD,
3041 /* 192 */ CWORD_CWORD_CWORD_CWORD,
3042 /* 193 */ CWORD_CWORD_CWORD_CWORD,
3043 /* 194 */ CWORD_CWORD_CWORD_CWORD,
3044 /* 195 */ CWORD_CWORD_CWORD_CWORD,
3045 /* 196 */ CWORD_CWORD_CWORD_CWORD,
3046 /* 197 */ CWORD_CWORD_CWORD_CWORD,
3047 /* 198 */ CWORD_CWORD_CWORD_CWORD,
3048 /* 199 */ CWORD_CWORD_CWORD_CWORD,
3049 /* 200 */ CWORD_CWORD_CWORD_CWORD,
3050 /* 201 */ CWORD_CWORD_CWORD_CWORD,
3051 /* 202 */ CWORD_CWORD_CWORD_CWORD,
3052 /* 203 */ CWORD_CWORD_CWORD_CWORD,
3053 /* 204 */ CWORD_CWORD_CWORD_CWORD,
3054 /* 205 */ CWORD_CWORD_CWORD_CWORD,
3055 /* 206 */ CWORD_CWORD_CWORD_CWORD,
3056 /* 207 */ CWORD_CWORD_CWORD_CWORD,
3057 /* 208 */ CWORD_CWORD_CWORD_CWORD,
3058 /* 209 */ CWORD_CWORD_CWORD_CWORD,
3059 /* 210 */ CWORD_CWORD_CWORD_CWORD,
3060 /* 211 */ CWORD_CWORD_CWORD_CWORD,
3061 /* 212 */ CWORD_CWORD_CWORD_CWORD,
3062 /* 213 */ CWORD_CWORD_CWORD_CWORD,
3063 /* 214 */ CWORD_CWORD_CWORD_CWORD,
3064 /* 215 */ CWORD_CWORD_CWORD_CWORD,
3065 /* 216 */ CWORD_CWORD_CWORD_CWORD,
3066 /* 217 */ CWORD_CWORD_CWORD_CWORD,
3067 /* 218 */ CWORD_CWORD_CWORD_CWORD,
3068 /* 219 */ CWORD_CWORD_CWORD_CWORD,
3069 /* 220 */ CWORD_CWORD_CWORD_CWORD,
3070 /* 221 */ CWORD_CWORD_CWORD_CWORD,
3071 /* 222 */ CWORD_CWORD_CWORD_CWORD,
3072 /* 223 */ CWORD_CWORD_CWORD_CWORD,
3073 /* 224 */ CWORD_CWORD_CWORD_CWORD,
3074 /* 225 */ CWORD_CWORD_CWORD_CWORD,
3075 /* 226 */ CWORD_CWORD_CWORD_CWORD,
3076 /* 227 */ CWORD_CWORD_CWORD_CWORD,
3077 /* 228 */ CWORD_CWORD_CWORD_CWORD,
3078 /* 229 */ CWORD_CWORD_CWORD_CWORD,
3079 /* 230 */ CWORD_CWORD_CWORD_CWORD,
3080 /* 231 */ CWORD_CWORD_CWORD_CWORD,
3081 /* 232 */ CWORD_CWORD_CWORD_CWORD,
3082 /* 233 */ CWORD_CWORD_CWORD_CWORD,
3083 /* 234 */ CWORD_CWORD_CWORD_CWORD,
3084 /* 235 */ CWORD_CWORD_CWORD_CWORD,
3085 /* 236 */ CWORD_CWORD_CWORD_CWORD,
3086 /* 237 */ CWORD_CWORD_CWORD_CWORD,
3087 /* 238 */ CWORD_CWORD_CWORD_CWORD,
3088 /* 239 */ CWORD_CWORD_CWORD_CWORD,
3089 /* 230 */ CWORD_CWORD_CWORD_CWORD,
3090 /* 241 */ CWORD_CWORD_CWORD_CWORD,
3091 /* 242 */ CWORD_CWORD_CWORD_CWORD,
3092 /* 243 */ CWORD_CWORD_CWORD_CWORD,
3093 /* 244 */ CWORD_CWORD_CWORD_CWORD,
3094 /* 245 */ CWORD_CWORD_CWORD_CWORD,
3095 /* 246 */ CWORD_CWORD_CWORD_CWORD,
3096 /* 247 */ CWORD_CWORD_CWORD_CWORD,
3097 /* 248 */ CWORD_CWORD_CWORD_CWORD,
3098 /* 249 */ CWORD_CWORD_CWORD_CWORD,
3099 /* 250 */ CWORD_CWORD_CWORD_CWORD,
3100 /* 251 */ CWORD_CWORD_CWORD_CWORD,
3101 /* 252 */ CWORD_CWORD_CWORD_CWORD,
3102 /* 253 */ CWORD_CWORD_CWORD_CWORD,
3103 /* 254 */ CWORD_CWORD_CWORD_CWORD,
3104 /* 255 */ CWORD_CWORD_CWORD_CWORD,
3105 /* PEOF */ CENDFILE_CENDFILE_CENDFILE_CENDFILE,
3106 # if ENABLE_ASH_ALIAS
3107 /* PEOA */ CSPCL_CIGN_CIGN_CIGN,
3111 # define SIT(c, syntax) ((S_I_T[syntax_index_table[c]] >> ((syntax)*4)) & 0xf)
3113 #endif /* !USE_SIT_FUNCTION */
3116 /* ============ Alias handling */
3118 #if ENABLE_ASH_ALIAS
3120 #define ALIASINUSE 1
3131 static struct alias **atab; // [ATABSIZE];
3132 #define INIT_G_alias() do { \
3133 atab = xzalloc(ATABSIZE * sizeof(atab[0])); \
3137 static struct alias **
3138 __lookupalias(const char *name)
3140 unsigned int hashval;
3147 ch = (unsigned char)*p;
3151 ch = (unsigned char)*++p;
3153 app = &atab[hashval % ATABSIZE];
3155 for (; *app; app = &(*app)->next) {
3156 if (strcmp(name, (*app)->name) == 0) {
3164 static struct alias *
3165 lookupalias(const char *name, int check)
3167 struct alias *ap = *__lookupalias(name);
3169 if (check && ap && (ap->flag & ALIASINUSE))
3174 static struct alias *
3175 freealias(struct alias *ap)
3179 if (ap->flag & ALIASINUSE) {
3180 ap->flag |= ALIASDEAD;
3192 setalias(const char *name, const char *val)
3194 struct alias *ap, **app;
3196 app = __lookupalias(name);
3200 if (!(ap->flag & ALIASINUSE)) {
3203 ap->val = ckstrdup(val);
3204 ap->flag &= ~ALIASDEAD;
3207 ap = ckzalloc(sizeof(struct alias));
3208 ap->name = ckstrdup(name);
3209 ap->val = ckstrdup(val);
3210 /*ap->flag = 0; - ckzalloc did it */
3211 /*ap->next = NULL;*/
3218 unalias(const char *name)
3222 app = __lookupalias(name);
3226 *app = freealias(*app);
3237 struct alias *ap, **app;
3241 for (i = 0; i < ATABSIZE; i++) {
3243 for (ap = *app; ap; ap = *app) {
3244 *app = freealias(*app);
3254 printalias(const struct alias *ap)
3256 out1fmt("%s=%s\n", ap->name, single_quote(ap->val));
3260 * TODO - sort output
3262 static int FAST_FUNC
3263 aliascmd(int argc UNUSED_PARAM, char **argv)
3272 for (i = 0; i < ATABSIZE; i++) {
3273 for (ap = atab[i]; ap; ap = ap->next) {
3279 while ((n = *++argv) != NULL) {
3280 v = strchr(n+1, '=');
3281 if (v == NULL) { /* n+1: funny ksh stuff */
3282 ap = *__lookupalias(n);
3284 fprintf(stderr, "%s: %s not found\n", "alias", n);
3297 static int FAST_FUNC
3298 unaliascmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
3302 while ((i = nextopt("a")) != '\0') {
3308 for (i = 0; *argptr; argptr++) {
3309 if (unalias(*argptr)) {
3310 fprintf(stderr, "%s: %s not found\n", "unalias", *argptr);
3318 #endif /* ASH_ALIAS */
3321 /* Mode argument to forkshell. Don't change FORK_FG or FORK_BG. */
3324 #define FORK_NOJOB 2
3326 /* mode flags for showjob(s) */
3327 #define SHOW_ONLY_PGID 0x01 /* show only pgid (jobs -p) */
3328 #define SHOW_PIDS 0x02 /* show individual pids, not just one line per job */
3329 #define SHOW_CHANGED 0x04 /* only jobs whose state has changed */
3330 #define SHOW_STDERR 0x08 /* print to stderr (else stdout) */
3333 * A job structure contains information about a job. A job is either a
3334 * single process or a set of processes contained in a pipeline. In the
3335 * latter case, pidlist will be non-NULL, and will point to a -1 terminated
3339 pid_t ps_pid; /* process id */
3340 int ps_status; /* last process status from wait() */
3341 char *ps_cmd; /* text of command being run */
3345 struct procstat ps0; /* status of process */
3346 struct procstat *ps; /* status or processes when more than one */
3348 int stopstatus; /* status of a stopped job */
3351 nprocs: 16, /* number of processes */
3353 #define JOBRUNNING 0 /* at least one proc running */
3354 #define JOBSTOPPED 1 /* all procs are stopped */
3355 #define JOBDONE 2 /* all procs are completed */
3357 sigint: 1, /* job was killed by SIGINT */
3358 jobctl: 1, /* job running under job control */
3360 waited: 1, /* true if this entry has been waited for */
3361 used: 1, /* true if this entry is in used */
3362 changed: 1; /* true if status has changed */
3363 struct job *prev_job; /* previous job */
3366 static struct job *makejob(/*union node *,*/ int);
3367 static int forkshell(struct job *, union node *, int);
3368 static int waitforjob(struct job *);
3371 enum { doing_jobctl = 0 };
3372 #define setjobctl(on) do {} while (0)
3374 static smallint doing_jobctl; //references:8
3375 static void setjobctl(int);
3382 ignoresig(int signo)
3384 /* Avoid unnecessary system calls. Is it already SIG_IGNed? */
3385 if (sigmode[signo - 1] != S_IGN && sigmode[signo - 1] != S_HARD_IGN) {
3386 /* No, need to do it */
3387 signal(signo, SIG_IGN);
3389 sigmode[signo - 1] = S_HARD_IGN;
3393 * Only one usage site - in setsignal()
3396 signal_handler(int signo)
3398 gotsig[signo - 1] = 1;
3400 if (signo == SIGINT && !trap[SIGINT]) {
3401 if (!suppress_int) {
3403 raise_interrupt(); /* does not return */
3407 pending_sig = signo;
3412 * Set the signal handler for the specified signal. The routine figures
3413 * out what it should be set to.
3416 setsignal(int signo)
3419 char cur_act, new_act;
3420 struct sigaction act;
3424 if (t != NULL) { /* trap for this sig is set */
3426 if (t[0] == '\0') /* trap is "": ignore this sig */
3430 if (rootshell && new_act == S_DFL) {
3433 if (iflag || minusc || sflag == 0)
3442 * "In all cases, bash ignores SIGQUIT. Non-builtin
3443 * commands run by bash have signal handlers
3444 * set to the values inherited by the shell
3445 * from its parent". */
3461 //TODO: if !rootshell, we reset SIGQUIT to DFL,
3462 //whereas we have to restore it to what shell got on entry
3463 //from the parent. See comment above
3465 t = &sigmode[signo - 1];
3468 /* current setting is not yet known */
3469 if (sigaction(signo, NULL, &act)) {
3470 /* pretend it worked; maybe we should give a warning,
3471 * but other shells don't. We don't alter sigmode,
3472 * so we retry every time.
3473 * btw, in Linux it never fails. --vda */
3476 if (act.sa_handler == SIG_IGN) {
3477 cur_act = S_HARD_IGN;
3479 && (signo == SIGTSTP || signo == SIGTTIN || signo == SIGTTOU)
3481 cur_act = S_IGN; /* don't hard ignore these */
3485 if (cur_act == S_HARD_IGN || cur_act == new_act)
3488 act.sa_handler = SIG_DFL;
3491 act.sa_handler = signal_handler;
3494 act.sa_handler = SIG_IGN;
3498 /* flags and mask matter only if !DFL and !IGN, but we do it
3499 * for all cases for more deterministic behavior:
3502 sigfillset(&act.sa_mask);
3504 sigaction_set(signo, &act);
3509 /* mode flags for set_curjob */
3510 #define CUR_DELETE 2
3511 #define CUR_RUNNING 1
3512 #define CUR_STOPPED 0
3514 /* mode flags for dowait */
3515 #define DOWAIT_NONBLOCK WNOHANG
3516 #define DOWAIT_BLOCK 0
3519 /* pgrp of shell on invocation */
3520 static int initialpgrp; //references:2
3521 static int ttyfd = -1; //5
3524 static struct job *jobtab; //5
3526 static unsigned njobs; //4
3528 static struct job *curjob; //lots
3529 /* number of presumed living untracked jobs */
3530 static int jobless; //4
3533 set_curjob(struct job *jp, unsigned mode)
3536 struct job **jpp, **curp;
3538 /* first remove from list */
3539 jpp = curp = &curjob;
3544 jpp = &jp1->prev_job;
3546 *jpp = jp1->prev_job;
3548 /* Then re-insert in correct position */
3556 /* job being deleted */
3559 /* newly created job or backgrounded job,
3560 * put after all stopped jobs.
3565 if (!jp1 || jp1->state != JOBSTOPPED)
3568 jpp = &jp1->prev_job;
3574 /* newly stopped job - becomes curjob */
3575 jp->prev_job = *jpp;
3583 jobno(const struct job *jp)
3585 return jp - jobtab + 1;
3590 * Convert a job name to a job structure.
3593 #define getjob(name, getctl) getjob(name)
3596 getjob(const char *name, int getctl)
3600 const char *err_msg = "%s: no such job";
3604 char *(*match)(const char *, const char *);
3619 if (c == '+' || c == '%') {
3621 err_msg = "No current job";
3627 err_msg = "No previous job";
3637 if (num > 0 && num <= njobs) {
3638 jp = jobtab + num - 1;
3653 if (match(jp->ps[0].ps_cmd, p)) {
3657 err_msg = "%s: ambiguous";
3667 err_msg = "job %s not created under job control";
3668 if (getctl && jp->jobctl == 0)
3673 ash_msg_and_raise_error(err_msg, name);
3677 * Mark a job structure as unused.
3680 freejob(struct job *jp)
3682 struct procstat *ps;
3686 for (i = jp->nprocs, ps = jp->ps; --i >= 0; ps++) {
3687 if (ps->ps_cmd != nullstr)
3690 if (jp->ps != &jp->ps0)
3693 set_curjob(jp, CUR_DELETE);
3699 xtcsetpgrp(int fd, pid_t pgrp)
3701 if (tcsetpgrp(fd, pgrp))
3702 ash_msg_and_raise_error("can't set tty process group (%m)");
3706 * Turn job control on and off.
3708 * Note: This code assumes that the third arg to ioctl is a character
3709 * pointer, which is true on Berkeley systems but not System V. Since
3710 * System V doesn't have job control yet, this isn't a problem now.
3712 * Called with interrupts off.
3720 if (on == doing_jobctl || rootshell == 0)
3724 ofd = fd = open(_PATH_TTY, O_RDWR);
3726 /* BTW, bash will try to open(ttyname(0)) if open("/dev/tty") fails.
3727 * That sometimes helps to acquire controlling tty.
3728 * Obviously, a workaround for bugs when someone
3729 * failed to provide a controlling tty to bash! :) */
3735 /* fd is a tty at this point */
3736 fd = fcntl(fd, F_DUPFD, 10);
3737 if (ofd >= 0) /* if it is "/dev/tty", close. If 0/1/2, dont */
3740 goto out; /* F_DUPFD failed */
3741 close_on_exec_on(fd);
3742 while (1) { /* while we are in the background */
3743 pgrp = tcgetpgrp(fd);
3746 ash_msg("can't access tty; job control turned off");
3750 if (pgrp == getpgrp())
3761 xtcsetpgrp(fd, pgrp);
3763 /* turning job control off */
3766 /* was xtcsetpgrp, but this can make exiting ash
3767 * loop forever if pty is already deleted */
3768 tcsetpgrp(fd, pgrp);
3782 static int FAST_FUNC
3783 killcmd(int argc, char **argv)
3785 if (argv[1] && strcmp(argv[1], "-l") != 0) {
3788 if (argv[i][0] == '%') {
3790 * "kill %N" - job kill
3791 * Converting to pgrp / pid kill
3797 jp = getjob(argv[i], 0);
3799 * In jobs started under job control, we signal
3800 * entire process group by kill -PGRP_ID.
3801 * This happens, f.e., in interactive shell.
3803 * Otherwise, we signal each child via
3804 * kill PID1 PID2 PID3.
3806 * sh -c 'sleep 1|sleep 1 & kill %1'
3807 * sh -c 'true|sleep 2 & sleep 1; kill %1'
3808 * sh -c 'true|sleep 1 & sleep 2; kill %1'
3810 n = jp->nprocs; /* can't be 0 (I hope) */
3813 dst = alloca(n * sizeof(int)*4);
3815 for (j = 0; j < n; j++) {
3816 struct procstat *ps = &jp->ps[j];
3817 /* Skip non-running and not-stopped members
3818 * (i.e. dead members) of the job
3820 if (ps->ps_status != -1 && !WIFSTOPPED(ps->ps_status))
3823 * kill_main has matching code to expect
3824 * leading space. Needed to not confuse
3825 * negative pids with "kill -SIGNAL_NO" syntax
3827 dst += sprintf(dst, jp->jobctl ? " -%u" : " %u", (int)ps->ps_pid);
3831 } while (argv[++i]);
3833 return kill_main(argc, argv);
3837 showpipe(struct job *jp /*, FILE *out*/)
3839 struct procstat *ps;
3840 struct procstat *psend;
3842 psend = jp->ps + jp->nprocs;
3843 for (ps = jp->ps + 1; ps < psend; ps++)
3844 printf(" | %s", ps->ps_cmd);
3845 newline_and_flush(stdout);
3846 flush_stdout_stderr();
3851 restartjob(struct job *jp, int mode)
3853 struct procstat *ps;
3859 if (jp->state == JOBDONE)
3861 jp->state = JOBRUNNING;
3862 pgid = jp->ps[0].ps_pid;
3863 if (mode == FORK_FG)
3864 xtcsetpgrp(ttyfd, pgid);
3865 killpg(pgid, SIGCONT);
3869 if (WIFSTOPPED(ps->ps_status)) {
3875 status = (mode == FORK_FG) ? waitforjob(jp) : 0;
3880 static int FAST_FUNC
3881 fg_bgcmd(int argc UNUSED_PARAM, char **argv)
3887 mode = (**argv == 'f') ? FORK_FG : FORK_BG;
3891 jp = getjob(*argv, 1);
3892 if (mode == FORK_BG) {
3893 set_curjob(jp, CUR_RUNNING);
3894 printf("[%d] ", jobno(jp));
3896 out1str(jp->ps[0].ps_cmd);
3897 showpipe(jp /*, stdout*/);
3898 retval = restartjob(jp, mode);
3899 } while (*argv && *++argv);
3905 sprint_status48(char *s, int status, int sigonly)
3911 if (!WIFEXITED(status)) {
3912 if (JOBS && WIFSTOPPED(status))
3913 st = WSTOPSIG(status);
3915 st = WTERMSIG(status);
3917 if (st == SIGINT || st == SIGPIPE)
3919 if (JOBS && WIFSTOPPED(status))
3923 //TODO: use bbox's get_signame? strsignal adds ~600 bytes to text+rodata
3924 col = fmtstr(s, 32, strsignal(st));
3925 if (WCOREDUMP(status)) {
3926 strcpy(s + col, " (core dumped)");
3927 col += sizeof(" (core dumped)")-1;
3929 } else if (!sigonly) {
3930 st = WEXITSTATUS(status);
3931 col = fmtstr(s, 16, (st ? "Done(%d)" : "Done"), st);
3938 dowait(int wait_flags, struct job *job)
3943 struct job *thisjob;
3945 TRACE(("dowait(0x%x) called\n", wait_flags));
3947 /* Do a wait system call. If job control is compiled in, we accept
3948 * stopped processes. wait_flags may have WNOHANG, preventing blocking.
3949 * NB: _not_ safe_waitpid, we need to detect EINTR */
3951 wait_flags |= WUNTRACED;
3952 pid = waitpid(-1, &status, wait_flags);
3953 TRACE(("wait returns pid=%d, status=0x%x, errno=%d(%s)\n",
3954 pid, status, errno, strerror(errno)));
3960 for (jp = curjob; jp; jp = jp->prev_job) {
3962 struct procstat *ps;
3963 struct procstat *psend;
3964 if (jp->state == JOBDONE)
3968 psend = ps + jp->nprocs;
3970 if (ps->ps_pid == pid) {
3971 TRACE(("Job %d: changing status of proc %d "
3972 "from 0x%x to 0x%x\n",
3973 jobno(jp), pid, ps->ps_status, status));
3974 ps->ps_status = status;
3977 if (ps->ps_status == -1)
3978 jobstate = JOBRUNNING;
3980 if (jobstate == JOBRUNNING)
3982 if (WIFSTOPPED(ps->ps_status)) {
3983 jp->stopstatus = ps->ps_status;
3984 jobstate = JOBSTOPPED;
3987 } while (++ps < psend);
3991 /* Found the job where one of its processes changed its state.
3992 * Is there at least one live and running process in this job? */
3993 if (jobstate != JOBRUNNING) {
3994 /* No. All live processes in the job are stopped
3995 * (JOBSTOPPED) or there are no live processes (JOBDONE)
3997 thisjob->changed = 1;
3998 if (thisjob->state != jobstate) {
3999 TRACE(("Job %d: changing state from %d to %d\n",
4000 jobno(thisjob), thisjob->state, jobstate));
4001 thisjob->state = jobstate;
4003 if (jobstate == JOBSTOPPED)
4004 set_curjob(thisjob, CUR_STOPPED);
4010 /* The process wasn't found in job list */
4011 if (JOBS && !WIFSTOPPED(status))
4016 if (thisjob && thisjob == job) {
4020 len = sprint_status48(s, status, 1);
4031 blocking_wait_with_raise_on_sig(void)
4033 pid_t pid = dowait(DOWAIT_BLOCK, NULL);
4034 if (pid <= 0 && pending_sig)
4035 raise_exception(EXSIG);
4041 showjob(struct job *jp, int mode)
4043 struct procstat *ps;
4044 struct procstat *psend;
4047 char s[16 + 16 + 48];
4048 FILE *out = (mode & SHOW_STDERR ? stderr : stdout);
4052 if (mode & SHOW_ONLY_PGID) { /* jobs -p */
4053 /* just output process (group) id of pipeline */
4054 fprintf(out, "%d\n", ps->ps_pid);
4058 col = fmtstr(s, 16, "[%d] ", jobno(jp));
4063 else if (curjob && jp == curjob->prev_job)
4066 if (mode & SHOW_PIDS)
4067 col += fmtstr(s + col, 16, "%d ", ps->ps_pid);
4069 psend = ps + jp->nprocs;
4071 if (jp->state == JOBRUNNING) {
4072 strcpy(s + col, "Running");
4073 col += sizeof("Running") - 1;
4075 int status = psend[-1].ps_status;
4076 if (jp->state == JOBSTOPPED)
4077 status = jp->stopstatus;
4078 col += sprint_status48(s + col, status, 0);
4080 /* By now, "[JOBID]* [maybe PID] STATUS" is printed */
4082 /* This loop either prints "<cmd1> | <cmd2> | <cmd3>" line
4083 * or prints several "PID | <cmdN>" lines,
4084 * depending on SHOW_PIDS bit.
4085 * We do not print status of individual processes
4086 * between PID and <cmdN>. bash does it, but not very well:
4087 * first line shows overall job status, not process status,
4088 * making it impossible to know 1st process status.
4092 /* for each process */
4095 if (mode & SHOW_PIDS)
4096 col = fmtstr(s, 48, "\n%*c%d ", indent_col, ' ', ps->ps_pid) - 1;
4098 fprintf(out, "%s%*c%s%s",
4100 33 - col >= 0 ? 33 - col : 0, ' ',
4101 ps == jp->ps ? "" : "| ",
4104 } while (++ps != psend);
4105 newline_and_flush(out);
4109 if (jp->state == JOBDONE) {
4110 TRACE(("showjob: freeing job %d\n", jobno(jp)));
4116 * Print a list of jobs. If "change" is nonzero, only print jobs whose
4117 * statuses have changed since the last call to showjobs.
4124 TRACE(("showjobs(0x%x) called\n", mode));
4126 /* Handle all finished jobs */
4127 while (dowait(DOWAIT_NONBLOCK, NULL) > 0)
4130 for (jp = curjob; jp; jp = jp->prev_job) {
4131 if (!(mode & SHOW_CHANGED) || jp->changed) {
4137 static int FAST_FUNC
4138 jobscmd(int argc UNUSED_PARAM, char **argv)
4143 while ((m = nextopt("lp")) != '\0') {
4147 mode |= SHOW_ONLY_PGID;
4153 showjob(getjob(*argv, 0), mode);
4163 /* Called only on finished or stopped jobs (no members are running) */
4165 getstatus(struct job *job)
4169 struct procstat *ps;
4171 /* Fetch last member's status */
4172 ps = job->ps + job->nprocs - 1;
4173 status = ps->ps_status;
4175 /* "set -o pipefail" mode: use last _nonzero_ status */
4176 while (status == 0 && --ps >= job->ps)
4177 status = ps->ps_status;
4180 retval = WEXITSTATUS(status);
4181 if (!WIFEXITED(status)) {
4183 retval = WSTOPSIG(status);
4184 if (!WIFSTOPPED(status))
4187 /* XXX: limits number of signals */
4188 retval = WTERMSIG(status);
4190 if (retval == SIGINT)
4196 TRACE(("getstatus: job %d, nproc %d, status 0x%x, retval 0x%x\n",
4197 jobno(job), job->nprocs, status, retval));
4201 static int FAST_FUNC
4202 waitcmd(int argc UNUSED_PARAM, char **argv)
4209 raise_exception(EXSIG);
4216 /* wait for all jobs */
4220 if (!jp) /* no running procs */
4222 if (jp->state == JOBRUNNING)
4227 blocking_wait_with_raise_on_sig();
4229 * "When bash is waiting for an asynchronous command via
4230 * the wait builtin, the reception of a signal for which a trap
4231 * has been set will cause the wait builtin to return immediately
4232 * with an exit status greater than 128, immediately after which
4233 * the trap is executed."
4235 * blocking_wait_with_raise_on_sig raises signal handlers
4236 * if it gets no pid (pid < 0). However,
4237 * if child sends us a signal *and immediately exits*,
4238 * blocking_wait_with_raise_on_sig gets pid > 0
4239 * and does not handle pending_sig. Check this case: */
4241 raise_exception(EXSIG);
4247 if (**argv != '%') {
4248 pid_t pid = number(*argv);
4253 if (job->ps[job->nprocs - 1].ps_pid == pid)
4255 job = job->prev_job;
4258 job = getjob(*argv, 0);
4260 /* loop until process terminated or stopped */
4261 while (job->state == JOBRUNNING)
4262 blocking_wait_with_raise_on_sig();
4264 retval = getstatus(job);
4277 struct job *jp, *jq;
4279 len = njobs * sizeof(*jp);
4281 jp = ckrealloc(jq, len + 4 * sizeof(*jp));
4283 offset = (char *)jp - (char *)jq;
4285 /* Relocate pointers */
4288 jq = (struct job *)((char *)jq + l);
4292 #define joff(p) ((struct job *)((char *)(p) + l))
4293 #define jmove(p) (p) = (void *)((char *)(p) + offset)
4294 if (joff(jp)->ps == &jq->ps0)
4295 jmove(joff(jp)->ps);
4296 if (joff(jp)->prev_job)
4297 jmove(joff(jp)->prev_job);
4307 jp = (struct job *)((char *)jp + len);
4311 } while (--jq >= jp);
4316 * Return a new job structure.
4317 * Called with interrupts off.
4320 makejob(/*union node *node,*/ int nprocs)
4325 for (i = njobs, jp = jobtab; ; jp++) {
4332 if (jp->state != JOBDONE || !jp->waited)
4341 memset(jp, 0, sizeof(*jp));
4343 /* jp->jobctl is a bitfield.
4344 * "jp->jobctl |= jobctl" likely to give awful code */
4348 jp->prev_job = curjob;
4353 jp->ps = ckmalloc(nprocs * sizeof(struct procstat));
4355 TRACE(("makejob(%d) returns %%%d\n", nprocs,
4362 * Return a string identifying a command (to be printed by the
4365 static char *cmdnextc;
4368 cmdputs(const char *s)
4370 static const char vstype[VSTYPE + 1][3] = {
4371 "", "}", "-", "+", "?", "=",
4372 "%", "%%", "#", "##"
4373 IF_ASH_BASH_COMPAT(, ":", "/", "//")
4376 const char *p, *str;
4380 unsigned char subtype = 0;
4384 nextc = makestrspace((strlen(s) + 1) * 8, cmdnextc);
4386 while ((c = *p++) != '\0') {
4394 if ((subtype & VSTYPE) == VSLENGTH)
4400 str = "\"}" + !(quoted & 1);
4407 #if ENABLE_SH_MATH_SUPPORT
4422 if ((subtype & VSTYPE) != VSNORMAL)
4424 str = vstype[subtype & VSTYPE];
4425 if (subtype & VSNUL)
4434 /* These can only happen inside quotes */
4447 while ((c = *str++) != '\0') {
4450 } /* while *p++ not NUL */
4453 USTPUTC('"', nextc);
4459 /* cmdtxt() and cmdlist() call each other */
4460 static void cmdtxt(union node *n);
4463 cmdlist(union node *np, int sep)
4465 for (; np; np = np->narg.next) {
4469 if (sep && np->narg.next)
4475 cmdtxt(union node *n)
4478 struct nodelist *lp;
4489 lp = n->npipe.cmdlist;
4507 cmdtxt(n->nbinary.ch1);
4523 cmdtxt(n->nif.test);
4525 if (n->nif.elsepart) {
4526 cmdtxt(n->nif.ifpart);
4528 n = n->nif.elsepart;
4546 cmdtxt(n->nbinary.ch1);
4556 cmdputs(n->nfor.var);
4558 cmdlist(n->nfor.args, 1);
4563 cmdputs(n->narg.text);
4567 cmdlist(n->ncmd.args, 1);
4568 cmdlist(n->ncmd.redirect, 0);
4581 cmdputs(n->ncase.expr->narg.text);
4583 for (np = n->ncase.cases; np; np = np->nclist.next) {
4584 cmdtxt(np->nclist.pattern);
4586 cmdtxt(np->nclist.body);
4600 #if ENABLE_ASH_BASH_COMPAT
4615 cmdputs(utoa(n->nfile.fd));
4617 if (n->type == NTOFD || n->type == NFROMFD) {
4618 cmdputs(utoa(n->ndup.dupfd));
4627 commandtext(union node *n)
4631 STARTSTACKSTR(cmdnextc);
4633 name = stackblock();
4634 TRACE(("commandtext: name %p, end %p\n", name, cmdnextc));
4635 return ckstrdup(name);
4640 * Fork off a subshell. If we are doing job control, give the subshell its
4641 * own process group. Jp is a job structure that the job is to be added to.
4642 * N is the command that will be evaluated by the child. Both jp and n may
4643 * be NULL. The mode parameter can be one of the following:
4644 * FORK_FG - Fork off a foreground process.
4645 * FORK_BG - Fork off a background process.
4646 * FORK_NOJOB - Like FORK_FG, but don't give the process its own
4647 * process group even if job control is on.
4649 * When job control is turned off, background processes have their standard
4650 * input redirected to /dev/null (except for the second and later processes
4653 * Called with interrupts off.
4656 * Clear traps on a fork.
4663 for (tp = trap; tp < &trap[NSIG]; tp++) {
4664 if (*tp && **tp) { /* trap not NULL or "" (SIG_IGN) */
4666 if (trap_ptr == trap)
4668 /* else: it "belongs" to trap_ptr vector, don't free */
4670 if ((tp - trap) != 0)
4671 setsignal(tp - trap);
4678 /* Lives far away from here, needed for forkchild */
4679 static void closescript(void);
4681 /* Called after fork(), in child */
4682 static NOINLINE void
4683 forkchild(struct job *jp, union node *n, int mode)
4687 TRACE(("Child shell %d\n", getpid()));
4691 /* man bash: "Non-builtin commands run by bash have signal handlers
4692 * set to the values inherited by the shell from its parent".
4693 * Do we do it correctly? */
4697 if (mode == FORK_NOJOB /* is it `xxx` ? */
4698 && n && n->type == NCMD /* is it single cmd? */
4699 /* && n->ncmd.args->type == NARG - always true? */
4700 && n->ncmd.args && strcmp(n->ncmd.args->narg.text, "trap") == 0
4701 && n->ncmd.args->narg.next == NULL /* "trap" with no arguments */
4702 /* && n->ncmd.args->narg.backquote == NULL - do we need to check this? */
4704 TRACE(("Trap hack\n"));
4705 /* Awful hack for `trap` or $(trap).
4707 * http://www.opengroup.org/onlinepubs/009695399/utilities/trap.html
4708 * contains an example where "trap" is executed in a subshell:
4710 * save_traps=$(trap)
4712 * eval "$save_traps"
4714 * Standard does not say that "trap" in subshell shall print
4715 * parent shell's traps. It only says that its output
4716 * must have suitable form, but then, in the above example
4717 * (which is not supposed to be normative), it implies that.
4719 * bash (and probably other shell) does implement it
4720 * (traps are reset to defaults, but "trap" still shows them),
4721 * but as a result, "trap" logic is hopelessly messed up:
4724 * trap -- 'echo Ho' SIGWINCH <--- we have a handler
4725 * # (trap) <--- trap is in subshell - no output (correct, traps are reset)
4726 * # true | trap <--- trap is in subshell - no output (ditto)
4727 * # echo `true | trap` <--- in subshell - output (but traps are reset!)
4728 * trap -- 'echo Ho' SIGWINCH
4729 * # echo `(trap)` <--- in subshell in subshell - output
4730 * trap -- 'echo Ho' SIGWINCH
4731 * # echo `true | (trap)` <--- in subshell in subshell in subshell - output!
4732 * trap -- 'echo Ho' SIGWINCH
4734 * The rules when to forget and when to not forget traps
4735 * get really complex and nonsensical.
4737 * Our solution: ONLY bare $(trap) or `trap` is special.
4739 /* Save trap handler strings for trap builtin to print */
4740 trap_ptr = xmemdup(trap, sizeof(trap));
4741 /* Fall through into clearing traps */
4745 /* do job control only in root shell */
4747 if (mode != FORK_NOJOB && jp->jobctl && oldlvl == 0) {
4750 if (jp->nprocs == 0)
4753 pgrp = jp->ps[0].ps_pid;
4754 /* this can fail because we are doing it in the parent also */
4756 if (mode == FORK_FG)
4757 xtcsetpgrp(ttyfd, pgrp);
4762 if (mode == FORK_BG) {
4763 /* man bash: "When job control is not in effect,
4764 * asynchronous commands ignore SIGINT and SIGQUIT" */
4767 if (jp->nprocs == 0) {
4769 if (open(bb_dev_null, O_RDONLY) != 0)
4770 ash_msg_and_raise_error("can't open '%s'", bb_dev_null);
4774 if (iflag) { /* why if iflag only? */
4779 * "In all cases, bash ignores SIGQUIT. Non-builtin
4780 * commands run by bash have signal handlers
4781 * set to the values inherited by the shell
4783 * Take care of the second rule: */
4787 if (n && n->type == NCMD
4788 && n->ncmd.args && strcmp(n->ncmd.args->narg.text, "jobs") == 0
4790 TRACE(("Job hack\n"));
4791 /* "jobs": we do not want to clear job list for it,
4792 * instead we remove only _its_ own_ job from job list.
4793 * This makes "jobs .... | cat" more useful.
4799 for (jp = curjob; jp; jp = jp->prev_job)
4804 /* Called after fork(), in parent */
4806 #define forkparent(jp, n, mode, pid) forkparent(jp, mode, pid)
4809 forkparent(struct job *jp, union node *n, int mode, pid_t pid)
4811 TRACE(("In parent shell: child = %d\n", pid));
4813 while (jobless && dowait(DOWAIT_NONBLOCK, NULL) > 0)
4819 if (mode != FORK_NOJOB && jp->jobctl) {
4822 if (jp->nprocs == 0)
4825 pgrp = jp->ps[0].ps_pid;
4826 /* This can fail because we are doing it in the child also */
4830 if (mode == FORK_BG) {
4831 backgndpid = pid; /* set $! */
4832 set_curjob(jp, CUR_RUNNING);
4835 struct procstat *ps = &jp->ps[jp->nprocs++];
4838 ps->ps_cmd = nullstr;
4840 if (doing_jobctl && n)
4841 ps->ps_cmd = commandtext(n);
4847 forkshell(struct job *jp, union node *n, int mode)
4851 TRACE(("forkshell(%%%d, %p, %d) called\n", jobno(jp), n, mode));
4854 TRACE(("Fork failed, errno=%d", errno));
4857 ash_msg_and_raise_error("can't fork");
4860 CLEAR_RANDOM_T(&random_gen); /* or else $RANDOM repeats in child */
4861 forkchild(jp, n, mode);
4863 forkparent(jp, n, mode, pid);
4869 * Wait for job to finish.
4871 * Under job control we have the problem that while a child process
4872 * is running interrupts generated by the user are sent to the child
4873 * but not to the shell. This means that an infinite loop started by
4874 * an interactive user may be hard to kill. With job control turned off,
4875 * an interactive user may place an interactive program inside a loop.
4876 * If the interactive program catches interrupts, the user doesn't want
4877 * these interrupts to also abort the loop. The approach we take here
4878 * is to have the shell ignore interrupt signals while waiting for a
4879 * foreground process to terminate, and then send itself an interrupt
4880 * signal if the child process was terminated by an interrupt signal.
4881 * Unfortunately, some programs want to do a bit of cleanup and then
4882 * exit on interrupt; unless these processes terminate themselves by
4883 * sending a signal to themselves (instead of calling exit) they will
4884 * confuse this approach.
4886 * Called with interrupts off.
4889 waitforjob(struct job *jp)
4893 TRACE(("waitforjob(%%%d) called\n", jobno(jp)));
4896 while (jp->state == JOBRUNNING) {
4897 /* In non-interactive shells, we _can_ get
4898 * a keyboard signal here and be EINTRed,
4899 * but we just loop back, waiting for command to complete.
4902 * "If bash is waiting for a command to complete and receives
4903 * a signal for which a trap has been set, the trap
4904 * will not be executed until the command completes."
4906 * Reality is that even if trap is not set, bash
4907 * will not act on the signal until command completes.
4908 * Try this. sleep5intoff.c:
4909 * #include <signal.h>
4910 * #include <unistd.h>
4913 * sigemptyset(&set);
4914 * sigaddset(&set, SIGINT);
4915 * sigaddset(&set, SIGQUIT);
4916 * sigprocmask(SIG_BLOCK, &set, NULL);
4920 * $ bash -c './sleep5intoff; echo hi'
4921 * ^C^C^C^C <--- pressing ^C once a second
4923 * $ bash -c './sleep5intoff; echo hi'
4924 * ^\^\^\^\hi <--- pressing ^\ (SIGQUIT)
4927 dowait(DOWAIT_BLOCK, jp);
4934 xtcsetpgrp(ttyfd, rootpid);
4936 * This is truly gross.
4937 * If we're doing job control, then we did a TIOCSPGRP which
4938 * caused us (the shell) to no longer be in the controlling
4939 * session -- so we wouldn't have seen any ^C/SIGINT. So, we
4940 * intuit from the subprocess exit status whether a SIGINT
4941 * occurred, and if so interrupt ourselves. Yuck. - mycroft
4943 if (jp->sigint) /* TODO: do the same with all signals */
4944 raise(SIGINT); /* ... by raise(jp->sig) instead? */
4946 if (jp->state == JOBDONE)
4953 * return 1 if there are stopped jobs, otherwise 0
4965 if (jp && jp->state == JOBSTOPPED) {
4966 out2str("You have stopped jobs.\n");
4975 /* ============ redir.c
4977 * Code for dealing with input/output redirection.
4982 #define EMPTY -2 /* marks an unused slot in redirtab */
4983 #define CLOSED -3 /* marks a slot of previously-closed fd */
4986 * Open a file in noclobber mode.
4987 * The code was copied from bash.
4990 noclobberopen(const char *fname)
4993 struct stat finfo, finfo2;
4996 * If the file exists and is a regular file, return an error
4999 r = stat(fname, &finfo);
5000 if (r == 0 && S_ISREG(finfo.st_mode)) {
5006 * If the file was not present (r != 0), make sure we open it
5007 * exclusively so that if it is created before we open it, our open
5008 * will fail. Make sure that we do not truncate an existing file.
5009 * Note that we don't turn on O_EXCL unless the stat failed -- if the
5010 * file was not a regular file, we leave O_EXCL off.
5013 return open(fname, O_WRONLY|O_CREAT|O_EXCL, 0666);
5014 fd = open(fname, O_WRONLY|O_CREAT, 0666);
5016 /* If the open failed, return the file descriptor right away. */
5021 * OK, the open succeeded, but the file may have been changed from a
5022 * non-regular file to a regular file between the stat and the open.
5023 * We are assuming that the O_EXCL open handles the case where FILENAME
5024 * did not exist and is symlinked to an existing file between the stat
5029 * If we can open it and fstat the file descriptor, and neither check
5030 * revealed that it was a regular file, and the file has not been
5031 * replaced, return the file descriptor.
5033 if (fstat(fd, &finfo2) == 0
5034 && !S_ISREG(finfo2.st_mode)
5035 && finfo.st_dev == finfo2.st_dev
5036 && finfo.st_ino == finfo2.st_ino
5041 /* The file has been replaced. badness. */
5048 * Handle here documents. Normally we fork off a process to write the
5049 * data to a pipe. If the document is short, we can stuff the data in
5050 * the pipe without forking.
5052 /* openhere needs this forward reference */
5053 static void expandhere(union node *arg, int fd);
5055 openhere(union node *redir)
5061 ash_msg_and_raise_error("pipe call failed");
5062 if (redir->type == NHERE) {
5063 len = strlen(redir->nhere.doc->narg.text);
5064 if (len <= PIPE_BUF) {
5065 full_write(pip[1], redir->nhere.doc->narg.text, len);
5069 if (forkshell((struct job *)NULL, (union node *)NULL, FORK_NOJOB) == 0) {
5072 ignoresig(SIGINT); //signal(SIGINT, SIG_IGN);
5073 ignoresig(SIGQUIT); //signal(SIGQUIT, SIG_IGN);
5074 ignoresig(SIGHUP); //signal(SIGHUP, SIG_IGN);
5075 ignoresig(SIGTSTP); //signal(SIGTSTP, SIG_IGN);
5076 signal(SIGPIPE, SIG_DFL);
5077 if (redir->type == NHERE)
5078 full_write(pip[1], redir->nhere.doc->narg.text, len);
5080 expandhere(redir->nhere.doc, pip[1]);
5081 _exit(EXIT_SUCCESS);
5089 openredirect(union node *redir)
5094 switch (redir->nfile.type) {
5095 /* Can't happen, our single caller does this itself */
5101 return openhere(redir);
5104 /* For N[X]HERE, reading redir->nfile.expfname would touch beyond
5105 * allocated space. Do it only when we know it is safe.
5107 fname = redir->nfile.expfname;
5109 switch (redir->nfile.type) {
5115 f = open(fname, O_RDONLY);
5120 f = open(fname, O_RDWR|O_CREAT, 0666);
5125 #if ENABLE_ASH_BASH_COMPAT
5128 /* Take care of noclobber mode. */
5130 f = noclobberopen(fname);
5137 f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666);
5142 f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666);
5150 ash_msg_and_raise_error("can't create %s: %s", fname, errmsg(errno, "nonexistent directory"));
5152 ash_msg_and_raise_error("can't open %s: %s", fname, errmsg(errno, "no such file"));
5156 * Copy a file descriptor to be >= 10. Throws exception on error.
5164 newfd = fcntl(from, F_DUPFD, 10);
5165 err = newfd < 0 ? errno : 0;
5168 ash_msg_and_raise_error("%d: %m", from);
5170 fcntl(newfd, F_SETFD, FD_CLOEXEC);
5176 dup2_or_raise(int from, int to)
5180 newfd = (from != to) ? dup2(from, to) : to;
5182 /* Happens when source fd is not open: try "echo >&99" */
5183 ash_msg_and_raise_error("%d: %m", from);
5188 /* Struct def and variable are moved down to the first usage site */
5193 struct redirtab *next;
5195 struct two_fd_t two_fd[];
5197 #define redirlist (G_var.redirlist)
5199 COPYFD_RESTORE = (int)~(INT_MAX),
5203 need_to_remember(struct redirtab *rp, int fd)
5207 if (!rp) /* remembering was not requested */
5210 for (i = 0; i < rp->pair_count; i++) {
5211 if (rp->two_fd[i].orig == fd) {
5212 /* already remembered */
5219 /* "hidden" fd is a fd used to read scripts, or a copy of such */
5221 is_hidden_fd(struct redirtab *rp, int fd)
5224 struct parsefile *pf;
5228 /* Check open scripts' fds */
5231 /* We skip pf_fd == 0 case because of the following case:
5232 * $ ash # running ash interactively
5234 * and in script.sh: "exec 9>&0".
5235 * Even though top-level pf_fd _is_ 0,
5236 * it's still ok to use it: "read" builtin uses it,
5237 * why should we cripple "exec" builtin?
5239 if (pf->pf_fd > 0 && fd == pf->pf_fd) {
5247 /* Check saved fds of redirects */
5248 fd |= COPYFD_RESTORE;
5249 for (i = 0; i < rp->pair_count; i++) {
5250 if (rp->two_fd[i].copy == fd) {
5258 * Process a list of redirection commands. If the REDIR_PUSH flag is set,
5259 * old file descriptors are stashed away so that the redirection can be
5260 * undone by calling popredir.
5262 /* flags passed to redirect */
5263 #define REDIR_PUSH 01 /* save previous values of file descriptors */
5264 #define REDIR_SAVEFD2 03 /* set preverrout */
5266 redirect(union node *redir, int flags)
5268 struct redirtab *sv;
5273 int copied_fd2 = -1;
5282 if (flags & REDIR_PUSH) {
5283 union node *tmp = redir;
5286 #if ENABLE_ASH_BASH_COMPAT
5287 if (tmp->nfile.type == NTO2)
5290 tmp = tmp->nfile.next;
5292 sv = ckmalloc(sizeof(*sv) + sv_pos * sizeof(sv->two_fd[0]));
5293 sv->next = redirlist;
5294 sv->pair_count = sv_pos;
5296 while (sv_pos > 0) {
5298 sv->two_fd[sv_pos].orig = sv->two_fd[sv_pos].copy = EMPTY;
5304 fd = redir->nfile.fd;
5305 if (redir->nfile.type == NTOFD || redir->nfile.type == NFROMFD) {
5306 right_fd = redir->ndup.dupfd;
5307 //bb_error_msg("doing %d > %d", fd, right_fd);
5308 /* redirect from/to same file descriptor? */
5311 /* "echo >&10" and 10 is a fd opened to a sh script? */
5312 if (is_hidden_fd(sv, right_fd)) {
5313 errno = EBADF; /* as if it is closed */
5314 ash_msg_and_raise_error("%d: %m", right_fd);
5318 newfd = openredirect(redir); /* always >= 0 */
5320 /* Descriptor wasn't open before redirect.
5321 * Mark it for close in the future */
5322 if (need_to_remember(sv, fd)) {
5323 goto remember_to_close;
5328 #if ENABLE_ASH_BASH_COMPAT
5331 if (need_to_remember(sv, fd)) {
5332 /* Copy old descriptor */
5333 /* Careful to not accidentally "save"
5334 * to the same fd as right side fd in N>&M */
5335 int minfd = right_fd < 10 ? 10 : right_fd + 1;
5336 i = fcntl(fd, F_DUPFD, minfd);
5337 /* You'd expect copy to be CLOEXECed. Currently these extra "saved" fds
5338 * are closed in popredir() in the child, preventing them from leaking
5339 * into child. (popredir() also cleans up the mess in case of failures)
5344 /* Strange error (e.g. "too many files" EMFILE?) */
5348 ash_msg_and_raise_error("%d: %m", fd);
5351 /* EBADF: it is not open - good, remember to close it */
5354 } else { /* fd is open, save its copy */
5355 /* "exec fd>&-" should not close fds
5356 * which point to script file(s).
5357 * Force them to be restored afterwards */
5358 if (is_hidden_fd(sv, fd))
5359 i |= COPYFD_RESTORE;
5363 sv->two_fd[sv_pos].orig = fd;
5364 sv->two_fd[sv_pos].copy = i;
5368 /* NTOFD/NFROMFD: copy redir->ndup.dupfd to fd */
5369 if (redir->ndup.dupfd < 0) { /* "fd>&-" */
5370 /* Don't want to trigger debugging */
5374 dup2_or_raise(redir->ndup.dupfd, fd);
5376 } else if (fd != newfd) { /* move newfd to fd */
5377 dup2_or_raise(newfd, fd);
5378 #if ENABLE_ASH_BASH_COMPAT
5379 if (!(redir->nfile.type == NTO2 && fd == 2))
5383 #if ENABLE_ASH_BASH_COMPAT
5384 if (redir->nfile.type == NTO2 && fd == 1) {
5385 /* We already redirected it to fd 1, now copy it to 2 */
5391 } while ((redir = redir->nfile.next) != NULL);
5394 if ((flags & REDIR_SAVEFD2) && copied_fd2 >= 0)
5395 preverrout_fd = copied_fd2;
5399 * Undo the effects of the last redirection.
5402 popredir(int drop, int restore)
5404 struct redirtab *rp;
5407 if (redirlist == NULL)
5411 for (i = 0; i < rp->pair_count; i++) {
5412 int fd = rp->two_fd[i].orig;
5413 int copy = rp->two_fd[i].copy;
5414 if (copy == CLOSED) {
5419 if (copy != EMPTY) {
5420 if (!drop || (restore && (copy & COPYFD_RESTORE))) {
5421 copy &= ~COPYFD_RESTORE;
5423 dup2_or_raise(copy, fd);
5425 close(copy & ~COPYFD_RESTORE);
5428 redirlist = rp->next;
5434 * Undo all redirections. Called on error or interrupt.
5438 redirectsafe(union node *redir, int flags)
5441 volatile int saveint;
5442 struct jmploc *volatile savehandler = exception_handler;
5443 struct jmploc jmploc;
5446 /* "echo 9>/dev/null; echo >&9; echo result: $?" - result should be 1, not 2! */
5447 err = setjmp(jmploc.loc); // huh?? was = setjmp(jmploc.loc) * 2;
5449 exception_handler = &jmploc;
5450 redirect(redir, flags);
5452 exception_handler = savehandler;
5453 if (err && exception_type != EXERROR)
5454 longjmp(exception_handler->loc, 1);
5455 RESTORE_INT(saveint);
5460 /* ============ Routines to expand arguments to commands
5462 * We have to deal with backquotes, shell variables, and file metacharacters.
5465 #if ENABLE_SH_MATH_SUPPORT
5467 ash_arith(const char *s)
5469 arith_state_t math_state;
5472 math_state.lookupvar = lookupvar;
5473 math_state.setvar = setvar0;
5474 //math_state.endofname = endofname;
5477 result = arith(&math_state, s);
5478 if (math_state.errmsg)
5479 ash_msg_and_raise_error(math_state.errmsg);
5489 #define EXP_FULL 0x1 /* perform word splitting & file globbing */
5490 #define EXP_TILDE 0x2 /* do normal tilde expansion */
5491 #define EXP_VARTILDE 0x4 /* expand tildes in an assignment */
5492 #define EXP_REDIR 0x8 /* file glob for a redirection (1 match only) */
5493 /* ^^^^^^^^^^^^^^ this is meant to support constructs such as "cmd >file*.txt"
5494 * POSIX says for this case:
5495 * Pathname expansion shall not be performed on the word by a
5496 * non-interactive shell; an interactive shell may perform it, but shall
5497 * do so only when the expansion would result in one word.
5498 * Currently, our code complies to the above rule by never globbing
5499 * redirection filenames.
5500 * Bash performs globbing, unless it is non-interactive and in POSIX mode.
5501 * (this means that on a typical Linux distro, bash almost always
5502 * performs globbing, and thus diverges from what we do).
5504 #define EXP_CASE 0x10 /* keeps quotes around for CASE pattern */
5505 #define EXP_QPAT 0x20 /* pattern in quoted parameter expansion */
5506 #define EXP_VARTILDE2 0x40 /* expand tildes after colons only */
5507 #define EXP_WORD 0x80 /* expand word in parameter expansion */
5508 #define EXP_QUOTED 0x100 /* expand word in double quotes */
5512 #define RMESCAPE_ALLOC 0x1 /* Allocate a new string */
5513 #define RMESCAPE_GLOB 0x2 /* Add backslashes for glob */
5514 #define RMESCAPE_GROW 0x8 /* Grow strings instead of stalloc */
5515 #define RMESCAPE_HEAP 0x10 /* Malloc strings instead of stalloc */
5516 #define RMESCAPE_SLASH 0x20 /* Stop globbing after slash */
5518 /* Add CTLESC when necessary. */
5519 #define QUOTES_ESC (EXP_FULL | EXP_CASE | EXP_QPAT | EXP_REDIR)
5520 /* Do not skip NUL characters. */
5521 #define QUOTES_KEEPNUL EXP_TILDE
5524 * Structure specifying which parts of the string should be searched
5525 * for IFS characters.
5528 struct ifsregion *next; /* next region in list */
5529 int begoff; /* offset of start of region */
5530 int endoff; /* offset of end of region */
5531 int nulonly; /* search for nul bytes only */
5535 struct strlist *list;
5536 struct strlist **lastp;
5539 /* output of current string */
5540 static char *expdest;
5541 /* list of back quote expressions */
5542 static struct nodelist *argbackq;
5543 /* first struct in list of ifs regions */
5544 static struct ifsregion ifsfirst;
5545 /* last struct in list */
5546 static struct ifsregion *ifslastp;
5547 /* holds expanded arg list */
5548 static struct arglist exparg;
5553 #if !ENABLE_SH_MATH_SUPPORT
5554 /* cvtnum() is used even if math support is off (to prepare $? values and such) */
5555 typedef long arith_t;
5556 # define ARITH_FMT "%ld"
5563 expdest = makestrspace(sizeof(arith_t)*3 + 2, expdest);
5564 len = fmtstr(expdest, sizeof(arith_t)*3 + 2, ARITH_FMT, num);
5565 STADJUST(len, expdest);
5570 esclen(const char *start, const char *p)
5574 while (p > start && (unsigned char)*--p == CTLESC) {
5581 * Remove any CTLESC characters from a string.
5584 rmescapes(char *str, int flag)
5586 static const char qchars[] ALIGN1 = {
5587 IF_ASH_BASH_COMPAT('/',) CTLESC, CTLQUOTEMARK, '\0' };
5591 unsigned protect_against_glob;
5593 IF_ASH_BASH_COMPAT(unsigned slash = flag & RMESCAPE_SLASH;)
5595 p = strpbrk(str, qchars IF_ASH_BASH_COMPAT(+ !slash));
5601 if (flag & RMESCAPE_ALLOC) {
5602 size_t len = p - str;
5603 size_t fulllen = len + strlen(p) + 1;
5605 if (flag & RMESCAPE_GROW) {
5606 int strloc = str - (char *)stackblock();
5607 r = makestrspace(fulllen, expdest);
5608 /* p and str may be invalidated by makestrspace */
5609 str = (char *)stackblock() + strloc;
5611 } else if (flag & RMESCAPE_HEAP) {
5612 r = ckmalloc(fulllen);
5614 r = stalloc(fulllen);
5618 q = (char *)memcpy(q, str, len) + len;
5623 globbing = flag & RMESCAPE_GLOB;
5624 protect_against_glob = globbing;
5626 if ((unsigned char)*p == CTLQUOTEMARK) {
5627 // Note: both inquotes and protect_against_glob only affect whether
5628 inquotes = ~inquotes;
5630 protect_against_glob = globbing;
5633 if ((unsigned char)*p == CTLESC) {
5637 ash_msg_and_raise_error("CTLESC at EOL (shouldn't happen)");
5639 if (protect_against_glob) {
5642 } else if (*p == '\\' && !inquotes) {
5643 /* naked back slash */
5644 protect_against_glob = 0;
5647 #if ENABLE_ASH_BASH_COMPAT
5648 else if (*p == '/' && slash) {
5649 /* stop handling globbing and mark location of slash */
5650 globbing = slash = 0;
5654 protect_against_glob = globbing;
5659 if (flag & RMESCAPE_GROW) {
5661 STADJUST(q - r + 1, expdest);
5665 #define pmatch(a, b) !fnmatch((a), (b), 0)
5668 * Prepare a pattern for a expmeta (internal glob(3)) call.
5670 * Returns an stalloced string.
5673 preglob(const char *pattern, int flag)
5675 return rmescapes((char *)pattern, flag | RMESCAPE_GLOB);
5679 * Put a string on the stack.
5682 memtodest(const char *p, size_t len, int syntax, int quotes)
5689 q = makestrspace((quotes & QUOTES_ESC) ? len * 2 : len, expdest);
5692 unsigned char c = *p++;
5694 int n = SIT(c, syntax);
5695 if ((quotes & QUOTES_ESC)
5697 || (((quotes & EXP_FULL) || syntax != BASESYNTAX)
5703 } else if (!(quotes & QUOTES_KEEPNUL))
5712 strtodest(const char *p, int syntax, int quotes)
5714 size_t len = strlen(p);
5715 memtodest(p, len, syntax, quotes);
5720 * Record the fact that we have to scan this region of the
5721 * string for IFS characters.
5724 recordregion(int start, int end, int nulonly)
5726 struct ifsregion *ifsp;
5728 if (ifslastp == NULL) {
5732 ifsp = ckzalloc(sizeof(*ifsp));
5733 /*ifsp->next = NULL; - ckzalloc did it */
5734 ifslastp->next = ifsp;
5738 ifslastp->begoff = start;
5739 ifslastp->endoff = end;
5740 ifslastp->nulonly = nulonly;
5744 removerecordregions(int endoff)
5746 if (ifslastp == NULL)
5749 if (ifsfirst.endoff > endoff) {
5750 while (ifsfirst.next) {
5751 struct ifsregion *ifsp;
5753 ifsp = ifsfirst.next->next;
5754 free(ifsfirst.next);
5755 ifsfirst.next = ifsp;
5758 if (ifsfirst.begoff > endoff) {
5761 ifslastp = &ifsfirst;
5762 ifsfirst.endoff = endoff;
5767 ifslastp = &ifsfirst;
5768 while (ifslastp->next && ifslastp->next->begoff < endoff)
5769 ifslastp = ifslastp->next;
5770 while (ifslastp->next) {
5771 struct ifsregion *ifsp;
5773 ifsp = ifslastp->next->next;
5774 free(ifslastp->next);
5775 ifslastp->next = ifsp;
5778 if (ifslastp->endoff > endoff)
5779 ifslastp->endoff = endoff;
5783 exptilde(char *startp, char *p, int flags)
5789 int quotes = flags & QUOTES_ESC;
5793 while ((c = *++p) != '\0') {
5800 if (flags & EXP_VARTILDE)
5810 if (*name == '\0') {
5811 home = lookupvar("HOME");
5813 pw = getpwnam(name);
5818 if (!home || !*home)
5821 strtodest(home, SQSYNTAX, quotes);
5829 * Execute a command inside back quotes. If it's a builtin command, we
5830 * want to save its output in a block obtained from malloc. Otherwise
5831 * we fork off a subprocess and get the output of the command via a pipe.
5832 * Should be called with interrupts off.
5834 struct backcmd { /* result of evalbackcmd */
5835 int fd; /* file descriptor to read from */
5836 int nleft; /* number of chars in buffer */
5837 char *buf; /* buffer */
5838 struct job *jp; /* job structure for command */
5841 /* These forward decls are needed to use "eval" code for backticks handling: */
5842 #define EV_EXIT 01 /* exit after evaluating tree */
5843 static int evaltree(union node *, int);
5845 static void FAST_FUNC
5846 evalbackcmd(union node *n, struct backcmd *result)
5860 ash_msg_and_raise_error("pipe call failed");
5861 jp = makejob(/*n,*/ 1);
5862 if (forkshell(jp, n, FORK_NOJOB) == 0) {
5867 dup2_or_raise(pip[1], 1);
5870 /* TODO: eflag clearing makes the following not abort:
5871 * ash -c 'set -e; z=$(false;echo foo); echo $z'
5872 * which is what bash does (unless it is in POSIX mode).
5873 * dash deleted "eflag = 0" line in the commit
5874 * Date: Mon, 28 Jun 2010 17:11:58 +1000
5875 * [EVAL] Don't clear eflag in evalbackcmd
5876 * For now, preserve bash-like behavior, it seems to be somewhat more useful:
5879 evaltree(n, EV_EXIT); /* actually evaltreenr... */
5883 result->fd = pip[0];
5887 TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n",
5888 result->fd, result->buf, result->nleft, result->jp));
5892 * Expand stuff in backwards quotes.
5895 expbackq(union node *cmd, int flag)
5903 int syntax = flag & EXP_QUOTED ? DQSYNTAX : BASESYNTAX;
5904 struct stackmark smark;
5907 startloc = expdest - (char *)stackblock();
5908 pushstackmark(&smark, startloc);
5909 evalbackcmd(cmd, &in);
5910 popstackmark(&smark);
5917 memtodest(p, i, syntax, flag & QUOTES_ESC);
5921 i = nonblock_immune_read(in.fd, buf, sizeof(buf));
5922 TRACE(("expbackq: read returns %d\n", i));
5931 back_exitstatus = waitforjob(in.jp);
5935 /* Eat all trailing newlines */
5937 for (; dest > (char *)stackblock() && dest[-1] == '\n';)
5941 if (!(flag & EXP_QUOTED))
5942 recordregion(startloc, dest - (char *)stackblock(), 0);
5943 TRACE(("evalbackq: size:%d:'%.*s'\n",
5944 (int)((dest - (char *)stackblock()) - startloc),
5945 (int)((dest - (char *)stackblock()) - startloc),
5946 stackblock() + startloc));
5949 #if ENABLE_SH_MATH_SUPPORT
5951 * Expand arithmetic expression. Backup to start of expression,
5952 * evaluate, place result in (backed up) result, adjust string position.
5964 * This routine is slightly over-complicated for
5965 * efficiency. Next we scan backwards looking for the
5966 * start of arithmetic.
5968 start = stackblock();
5975 while ((unsigned char)*p != CTLARI) {
5979 ash_msg_and_raise_error("missing CTLARI (shouldn't happen)");
5984 esc = esclen(start, p);
5994 removerecordregions(begoff);
5998 if (flag & QUOTES_ESC)
5999 rmescapes(p + 1, 0);
6001 len = cvtnum(ash_arith(p + 1));
6003 if (!(flag & EXP_QUOTED))
6004 recordregion(begoff, begoff + len, 0);
6008 /* argstr needs it */
6009 static char *evalvar(char *p, int flags, struct strlist *var_str_list);
6012 * Perform variable and command substitution. If EXP_FULL is set, output CTLESC
6013 * characters to allow for further processing. Otherwise treat
6014 * $@ like $* since no splitting will be performed.
6016 * var_str_list (can be NULL) is a list of "VAR=val" strings which take precedence
6017 * over shell varables. Needed for "A=a B=$A; echo $B" case - we use it
6018 * for correct expansion of "B=$A" word.
6021 argstr(char *p, int flags, struct strlist *var_str_list)
6023 static const char spclchars[] ALIGN1 = {
6031 #if ENABLE_SH_MATH_SUPPORT
6036 const char *reject = spclchars;
6037 int breakall = (flags & (EXP_WORD | EXP_QUOTED)) == EXP_WORD;
6042 if (!(flags & EXP_VARTILDE)) {
6044 } else if (flags & EXP_VARTILDE2) {
6049 if (flags & EXP_TILDE) {
6052 flags &= ~EXP_TILDE;
6056 p = exptilde(p, q, flags);
6059 startloc = expdest - (char *)stackblock();
6063 length += strcspn(p + length, reject);
6067 IF_SH_MATH_SUPPORT(|| c == CTLENDARI)
6069 /* c == '=' || c == ':' || c == CTLENDARI */
6075 expdest = stack_nputstr(p, length, expdest);
6076 newloc = expdest - (char *)stackblock();
6077 if (breakall && !inquotes && newloc > startloc) {
6078 recordregion(startloc, newloc, 0);
6089 if (flags & EXP_VARTILDE2) {
6093 flags |= EXP_VARTILDE2;
6098 * sort of a hack - expand tildes in variable
6099 * assignments (after the first '=' and after ':'s).
6108 case CTLENDVAR: /* ??? */
6111 inquotes ^= EXP_QUOTED;
6112 /* "$@" syntax adherence hack */
6113 if (inquotes && !memcmp(p, dolatstr + 1, DOLATSTRLEN - 1)) {
6114 p = evalvar(p + 1, flags | inquotes, /* var_str_list: */ NULL) + 1;
6118 if (flags & QUOTES_ESC) {
6129 * Quoted parameter expansion pattern: remove quote
6130 * unless inside inner quotes or we have a literal
6133 if (((flags | inquotes) & (EXP_QPAT | EXP_QUOTED)) ==
6134 EXP_QPAT && *p != '\\')
6139 TRACE(("argstr: evalvar('%s')\n", p));
6140 p = evalvar(p, flags | inquotes, var_str_list);
6141 TRACE(("argstr: evalvar:'%s'\n", (char *)stackblock()));
6144 expbackq(argbackq->n, flags | inquotes);
6145 argbackq = argbackq->next;
6147 #if ENABLE_SH_MATH_SUPPORT
6150 expari(flags | inquotes);
6159 scanleft(char *startp, char *rmesc, char *rmescend UNUSED_PARAM,
6160 char *pattern, int quotes, int zero)
6169 const char *s = loc2;
6176 match = pmatch(pattern, s);
6181 if (quotes && (unsigned char)*loc == CTLESC)
6190 scanright(char *startp, char *rmesc, char *rmescend,
6191 char *pattern, int quotes, int match_at_start)
6193 #if !ENABLE_ASH_OPTIMIZE_FOR_SIZE
6194 int try2optimize = match_at_start;
6200 /* If we called by "${v/pattern/repl}" or "${v//pattern/repl}":
6201 * startp="escaped_value_of_v" rmesc="raw_value_of_v"
6202 * rmescend=""(ptr to NUL in rmesc) pattern="pattern" quotes=match_at_start=1
6204 * loc starts at NUL at the end of startp, loc2 starts at the end of rmesc,
6205 * and on each iteration they go back two/one char until they reach the beginning.
6206 * We try to find a match in "raw_value_of_v", "raw_value_of_", "raw_value_of" etc.
6208 /* TODO: document in what other circumstances we are called. */
6210 for (loc = pattern - 1, loc2 = rmescend; loc >= startp; loc2--) {
6213 const char *s = loc2;
6214 if (match_at_start) {
6218 match = pmatch(pattern, s);
6219 //bb_error_msg("pmatch(pattern:'%s',s:'%s'):%d", pattern, s, match);
6223 #if !ENABLE_ASH_OPTIMIZE_FOR_SIZE
6225 /* Maybe we can optimize this:
6226 * if pattern ends with unescaped *, we can avoid checking
6227 * shorter strings: if "foo*" doesnt match "raw_value_of_v",
6228 * it wont match truncated "raw_value_of_" strings too.
6230 unsigned plen = strlen(pattern);
6231 /* Does it end with "*"? */
6232 if (plen != 0 && pattern[--plen] == '*') {
6233 /* "xxxx*" is not escaped */
6234 /* "xxx\*" is escaped */
6235 /* "xx\\*" is not escaped */
6236 /* "x\\\*" is escaped */
6238 while (plen != 0 && pattern[--plen] == '\\')
6241 break; /* ends with unescaped "*" */
6249 esc = esclen(startp, loc);
6260 static void varunset(const char *, const char *, const char *, int) NORETURN;
6262 varunset(const char *end, const char *var, const char *umsg, int varflags)
6268 msg = "parameter not set";
6270 if ((unsigned char)*end == CTLENDVAR) {
6271 if (varflags & VSNUL)
6277 ash_msg_and_raise_error("%.*s: %s%s", (int)(end - var - 1), var, msg, tail);
6281 subevalvar(char *p, char *varname, int strloc, int subtype,
6282 int startloc, int varflags, int flag, struct strlist *var_str_list)
6284 struct nodelist *saveargbackq = argbackq;
6285 int quotes = flag & QUOTES_ESC;
6288 char *rmesc, *rmescend;
6290 IF_ASH_BASH_COMPAT(char *repl = NULL;)
6291 IF_ASH_BASH_COMPAT(int pos, len, orig_len;)
6292 int amount, resetloc;
6293 IF_ASH_BASH_COMPAT(int workloc;)
6295 char *(*scan)(char*, char*, char*, char*, int, int);
6297 //bb_error_msg("subevalvar(p:'%s',varname:'%s',strloc:%d,subtype:%d,startloc:%d,varflags:%x,quotes:%d)",
6298 // p, varname, strloc, subtype, startloc, varflags, quotes);
6300 argstr(p, EXP_TILDE | (subtype != VSASSIGN && subtype != VSQUESTION ?
6301 (flag & (EXP_QUOTED | EXP_QPAT) ? EXP_QPAT : EXP_CASE) : 0),
6303 STPUTC('\0', expdest);
6304 argbackq = saveargbackq;
6305 startp = (char *)stackblock() + startloc;
6309 setvar0(varname, startp);
6310 amount = startp - expdest;
6311 STADJUST(amount, expdest);
6315 varunset(p, varname, startp, varflags);
6318 #if ENABLE_ASH_BASH_COMPAT
6320 //TODO: support more general format ${v:EXPR:EXPR},
6321 // where EXPR follows $(()) rules
6322 loc = str = stackblock() + strloc;
6323 /* Read POS in ${var:POS:LEN} */
6324 pos = atoi(loc); /* number(loc) errors out on "1:4" */
6325 len = str - startp - 1;
6327 /* *loc != '\0', guaranteed by parser */
6331 /* Adjust the length by the number of escapes */
6332 for (ptr = startp; ptr < (str - 1); ptr++) {
6333 if ((unsigned char)*ptr == CTLESC) {
6341 if (*loc++ == ':') {
6345 /* Skip POS in ${var:POS:LEN} */
6347 while (*loc && *loc != ':') {
6349 * bash complains on: var=qwe; echo ${var:1a:123}
6351 ash_msg_and_raise_error(msg_illnum, str);
6355 if (*loc++ == ':') {
6360 /* ${VAR:$((-n)):l} starts n chars from the end */
6361 pos = orig_len + pos;
6363 if ((unsigned)pos >= orig_len) {
6364 /* apart from obvious ${VAR:999999:l},
6365 * covers ${VAR:$((-9999999)):l} - result is ""
6371 if (len > (orig_len - pos))
6372 len = orig_len - pos;
6374 for (str = startp; pos; str++, pos--) {
6375 if (quotes && (unsigned char)*str == CTLESC)
6378 for (loc = startp; len; len--) {
6379 if (quotes && (unsigned char)*str == CTLESC)
6384 amount = loc - expdest;
6385 STADJUST(amount, expdest);
6390 resetloc = expdest - (char *)stackblock();
6392 /* We'll comeback here if we grow the stack while handling
6393 * a VSREPLACE or VSREPLACEALL, since our pointers into the
6394 * stack will need rebasing, and we'll need to remove our work
6397 IF_ASH_BASH_COMPAT(restart:)
6399 amount = expdest - ((char *)stackblock() + resetloc);
6400 STADJUST(-amount, expdest);
6401 startp = (char *)stackblock() + startloc;
6404 rmescend = (char *)stackblock() + strloc;
6406 rmesc = rmescapes(startp, RMESCAPE_ALLOC | RMESCAPE_GROW);
6407 if (rmesc != startp) {
6409 startp = (char *)stackblock() + startloc;
6413 str = (char *)stackblock() + strloc;
6415 * Example: v='a\bc'; echo ${v/\\b/_\\_\z_}
6416 * The result is a_\_z_c (not a\_\_z_c)!
6418 * The search pattern and replace string treat backslashes differently!
6419 * RMESCAPE_SLASH causes preglob to work differently on the pattern
6420 * and string. It's only used on the first call.
6422 preglob(str, IF_ASH_BASH_COMPAT(
6423 (subtype == VSREPLACE || subtype == VSREPLACEALL) && !repl ?
6424 RMESCAPE_SLASH :) 0);
6426 #if ENABLE_ASH_BASH_COMPAT
6427 workloc = expdest - (char *)stackblock();
6428 if (subtype == VSREPLACE || subtype == VSREPLACEALL) {
6432 repl = strchr(str, CTLESC);
6438 //bb_error_msg("str:'%s' repl:'%s'", str, repl);
6440 /* If there's no pattern to match, return the expansion unmolested */
6449 loc = scanright(idx, rmesc, rmescend, str, quotes, 1);
6450 //bb_error_msg("scanright('%s'):'%s'", str, loc);
6452 /* No match, advance */
6453 char *restart_detect = stackblock();
6455 STPUTC(*idx, expdest);
6456 if (quotes && (unsigned char)*idx == CTLESC) {
6459 STPUTC(*idx, expdest);
6461 if (stackblock() != restart_detect)
6466 /* continue; - prone to quadratic behavior, smarter code: */
6469 if (str[0] == '*') {
6470 /* Pattern is "*foo". If "*foo" does not match "long_string",
6471 * it would never match "ong_string" etc, no point in trying.
6478 if (subtype == VSREPLACEALL) {
6480 if (quotes && (unsigned char)*idx == CTLESC)
6489 //bb_error_msg("repl:'%s'", repl);
6490 for (loc = (char*)repl; *loc; loc++) {
6491 char *restart_detect = stackblock();
6492 if (quotes && *loc == '\\') {
6493 STPUTC(CTLESC, expdest);
6496 STPUTC(*loc, expdest);
6497 if (stackblock() != restart_detect)
6502 if (subtype == VSREPLACE) {
6503 //bb_error_msg("tail:'%s', quotes:%x", idx, quotes);
6505 char *restart_detect = stackblock();
6506 STPUTC(*idx, expdest);
6507 if (stackblock() != restart_detect)
6516 /* We've put the replaced text into a buffer at workloc, now
6517 * move it to the right place and adjust the stack.
6519 STPUTC('\0', expdest);
6520 startp = (char *)stackblock() + startloc;
6521 memmove(startp, (char *)stackblock() + workloc, len + 1);
6522 //bb_error_msg("startp:'%s'", startp);
6523 amount = expdest - (startp + len);
6524 STADJUST(-amount, expdest);
6527 #endif /* ENABLE_ASH_BASH_COMPAT */
6529 subtype -= VSTRIMRIGHT;
6531 if (subtype < 0 || subtype > 7)
6534 /* zero = (subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX) */
6535 zero = subtype >> 1;
6536 /* VSTRIMLEFT/VSTRIMRIGHTMAX -> scanleft */
6537 scan = (subtype & 1) ^ zero ? scanleft : scanright;
6539 loc = scan(startp, rmesc, rmescend, str, quotes, zero);
6542 memmove(startp, loc, str - loc);
6543 loc = startp + (str - loc) - 1;
6546 amount = loc - expdest;
6547 STADJUST(amount, expdest);
6553 * Add the value of a specialized variable to the stack string.
6554 * name parameter (examples):
6555 * ash -c 'echo $1' name:'1='
6556 * ash -c 'echo $qwe' name:'qwe='
6557 * ash -c 'echo $$' name:'$='
6558 * ash -c 'echo ${$}' name:'$='
6559 * ash -c 'echo ${$##q}' name:'$=q'
6560 * ash -c 'echo ${#$}' name:'$='
6561 * note: examples with bad shell syntax:
6562 * ash -c 'echo ${#$1}' name:'$=1'
6563 * ash -c 'echo ${#1#}' name:'1=#'
6565 static NOINLINE ssize_t
6566 varvalue(char *name, int varflags, int flags, struct strlist *var_str_list, int *quotedp)
6573 int quoted = *quotedp;
6574 int subtype = varflags & VSTYPE;
6575 int discard = subtype == VSPLUS || subtype == VSLENGTH;
6576 int quotes = (discard ? 0 : (flags & QUOTES_ESC)) | QUOTES_KEEPNUL;
6579 sep = (flags & EXP_FULL) << CHAR_BIT;
6580 syntax = quoted ? DQSYNTAX : BASESYNTAX;
6590 num = shellparam.nparam;
6598 goto check_1char_name;
6600 expdest = makestrspace(NOPTS, expdest);
6601 for (i = NOPTS - 1; i >= 0; i--) {
6603 USTPUTC(optletters(i), expdest);
6609 /* handles cases similar to ${#$1} */
6610 if (name[2] != '\0')
6611 raise_error_syntax("bad substitution");
6624 sep |= ifsset() ? ifsval()[0] : ' ';
6631 while ((p = *ap++) != NULL) {
6632 len += strtodest(p, syntax, quotes);
6636 memtodest(&sepc, 1, syntax, quotes);
6651 num = atoi(name); /* number(name) fails on ${N#str} etc */
6652 if (num < 0 || num > shellparam.nparam)
6654 p = num ? shellparam.p[num - 1] : arg0;
6657 /* NB: name has form "VAR=..." */
6659 /* "A=a B=$A" case: var_str_list is a list of "A=a" strings
6660 * which should be considered before we check variables. */
6662 unsigned name_len = (strchrnul(name, '=') - name) + 1;
6666 str = var_str_list->text;
6667 eq = strchr(str, '=');
6668 if (!eq) /* stop at first non-assignment */
6671 if (name_len == (unsigned)(eq - str)
6672 && strncmp(str, name, name_len) == 0
6675 /* goto value; - WRONG! */
6676 /* think "A=1 A=2 B=$A" */
6678 var_str_list = var_str_list->next;
6679 } while (var_str_list);
6683 p = lookupvar(name);
6688 len = strtodest(p, syntax, quotes);
6689 #if ENABLE_UNICODE_SUPPORT
6690 if (subtype == VSLENGTH && len > 0) {
6691 reinit_unicode_for_ash();
6692 if (unicode_status == UNICODE_ON) {
6693 STADJUST(-len, expdest);
6695 len = unicode_strlen(p);
6703 STADJUST(-len, expdest);
6708 * Expand a variable, and return a pointer to the next character in the
6712 evalvar(char *p, int flag, struct strlist *var_str_list)
6723 varflags = (unsigned char) *p++;
6724 subtype = varflags & VSTYPE;
6727 raise_error_syntax("bad substitution");
6729 quoted = flag & EXP_QUOTED;
6731 easy = (!quoted || (*var == '@' && shellparam.nparam));
6732 startloc = expdest - (char *)stackblock();
6733 p = strchr(p, '=') + 1; //TODO: use var_end(p)?
6736 varlen = varvalue(var, varflags, flag, var_str_list, "ed);
6737 if (varflags & VSNUL)
6740 if (subtype == VSPLUS) {
6741 varlen = -1 - varlen;
6745 if (subtype == VSMINUS) {
6750 flag | EXP_TILDE | EXP_WORD,
6758 if (subtype == VSASSIGN || subtype == VSQUESTION) {
6762 subevalvar(p, var, 0, subtype, startloc, varflags,
6763 flag & ~QUOTES_ESC, var_str_list);
6766 * Remove any recorded regions beyond
6769 removerecordregions(startloc);
6773 if (varlen < 0 && uflag)
6774 varunset(p, var, 0, 0);
6776 if (subtype == VSLENGTH) {
6777 cvtnum(varlen > 0 ? varlen : 0);
6781 if (subtype == VSNORMAL) {
6785 recordregion(startloc, expdest - (char *)stackblock(), quoted);
6794 case VSTRIMRIGHTMAX:
6795 #if ENABLE_ASH_BASH_COMPAT
6808 * Terminate the string and start recording the pattern
6811 STPUTC('\0', expdest);
6812 patloc = expdest - (char *)stackblock();
6813 if (NULL == subevalvar(p, /* varname: */ NULL, patloc, subtype,
6814 startloc, varflags, flag, var_str_list)) {
6815 int amount = expdest - (
6816 (char *)stackblock() + patloc - 1
6818 STADJUST(-amount, expdest);
6820 /* Remove any recorded regions beyond start of variable */
6821 removerecordregions(startloc);
6826 if (subtype != VSNORMAL) { /* skip to end of alternative */
6829 unsigned char c = *p++;
6832 else if (c == CTLBACKQ) {
6834 argbackq = argbackq->next;
6835 } else if (c == CTLVAR) {
6836 if ((*p++ & VSTYPE) != VSNORMAL)
6838 } else if (c == CTLENDVAR) {
6848 * Break the argument string into pieces based upon IFS and add the
6849 * strings to the argument list. The regions of the string to be
6850 * searched for IFS characters have been stored by recordregion.
6853 ifsbreakup(char *string, struct arglist *arglist)
6855 struct ifsregion *ifsp;
6860 const char *ifs, *realifs;
6865 if (ifslastp != NULL) {
6868 realifs = ifsset() ? ifsval() : defifs;
6871 p = string + ifsp->begoff;
6872 nulonly = ifsp->nulonly;
6873 ifs = nulonly ? nullstr : realifs;
6875 while (p < string + ifsp->endoff) {
6877 if ((unsigned char)*p == CTLESC)
6879 if (!strchr(ifs, *p)) {
6884 ifsspc = (strchr(defifs, *p) != NULL);
6885 /* Ignore IFS whitespace at start */
6886 if (q == start && ifsspc) {
6892 sp = stzalloc(sizeof(*sp));
6894 *arglist->lastp = sp;
6895 arglist->lastp = &sp->next;
6899 if (p >= string + ifsp->endoff) {
6903 if ((unsigned char)*p == CTLESC)
6905 if (strchr(ifs, *p) == NULL) {
6909 if (strchr(defifs, *p) == NULL) {
6924 } while (ifsp != NULL);
6933 sp = stzalloc(sizeof(*sp));
6935 *arglist->lastp = sp;
6936 arglist->lastp = &sp->next;
6942 struct ifsregion *p;
6947 struct ifsregion *ifsp;
6953 ifsfirst.next = NULL;
6958 * Add a file name to the list.
6961 addfname(const char *name)
6965 sp = stzalloc(sizeof(*sp));
6966 sp->text = sstrdup(name);
6968 exparg.lastp = &sp->next;
6971 /* If we want to use glob() from libc... */
6972 #if !ENABLE_ASH_INTERNAL_GLOB
6974 /* Add the result of glob() to the list */
6976 addglob(const glob_t *pglob)
6978 char **p = pglob->gl_pathv;
6985 expandmeta(struct strlist *str /*, int flag*/)
6987 /* TODO - EXP_REDIR */
6997 p = preglob(str->text, RMESCAPE_ALLOC | RMESCAPE_HEAP);
6998 // GLOB_NOMAGIC (GNU): if no *?[ chars in pattern, return it even if no match
6999 // GLOB_NOCHECK: if no match, return unchanged pattern (sans \* escapes?)
7001 // glibc 2.24.90 glob(GLOB_NOMAGIC) does not remove backslashes used for escaping:
7002 // if you pass it "file\?", it returns "file\?", not "file?", if no match.
7003 // Which means you need to unescape the string, right? Not so fast:
7004 // if there _is_ a file named "file\?" (with backslash), it is returned
7005 // as "file\?" too (whichever pattern you used to find it, say, "file*").
7006 // You DONT KNOW by looking at the result whether you need to unescape it.
7008 // Worse, globbing of "file\?" in a directory with two files, "file?" and "file\?",
7009 // returns "file\?" - which is WRONG: "file\?" pattern matches "file?" file.
7010 // Without GLOB_NOMAGIC, this works correctly ("file?" is returned as a match).
7011 // With GLOB_NOMAGIC | GLOB_NOCHECK, this also works correctly.
7012 // i = glob(p, GLOB_NOMAGIC | GLOB_NOCHECK, NULL, &pglob);
7013 // i = glob(p, GLOB_NOMAGIC, NULL, &pglob);
7014 i = glob(p, 0, NULL, &pglob);
7015 //bb_error_msg("glob('%s'):%d '%s'...", p, i, pglob.gl_pathv ? pglob.gl_pathv[0] : "-");
7020 #if 0 // glibc 2.24.90 bug? Patterns like "*/file", when match, don't set GLOB_MAGCHAR
7021 /* GLOB_MAGCHAR is set if *?[ chars were seen (GNU) */
7022 if (!(pglob.gl_flags & GLOB_MAGCHAR))
7034 *exparg.lastp = str;
7035 rmescapes(str->text, 0);
7036 exparg.lastp = &str->next;
7038 default: /* GLOB_NOSPACE */
7041 ash_msg_and_raise_error(bb_msg_memory_exhausted);
7048 /* ENABLE_ASH_INTERNAL_GLOB: Homegrown globbing code. (dash also has both, uses homegrown one.) */
7051 * Do metacharacter (i.e. *, ?, [...]) expansion.
7054 expmeta(char *expdir, char *enddir, char *name)
7070 for (p = name; esc = 0, *p; p += esc + 1) {
7071 if (*p == '*' || *p == '?')
7073 else if (*p == '[') {
7080 if (*q == '/' || *q == '\0')
7090 if (p[esc] == '/') {
7093 start = p + esc + 1;
7097 if (metaflag == 0) { /* we've reached the end of the file name */
7098 if (enddir != expdir)
7106 if (metaflag == 0 || lstat(expdir, &statb) >= 0)
7117 } while (p < start);
7119 if (enddir == expdir) {
7121 } else if (enddir == expdir + 1 && *expdir == '/') {
7130 if (enddir != expdir)
7132 if (*endname == 0) {
7145 while (!pending_int && (dp = readdir(dirp)) != NULL) {
7146 if (dp->d_name[0] == '.' && !matchdot)
7148 if (pmatch(start, dp->d_name)) {
7150 strcpy(enddir, dp->d_name);
7153 for (p = enddir, cp = dp->d_name; (*p++ = *cp++) != '\0';)
7156 expmeta(expdir, p, endname);
7162 endname[-esc - 1] = esc ? '\\' : '/';
7165 static struct strlist *
7166 msort(struct strlist *list, int len)
7168 struct strlist *p, *q = NULL;
7169 struct strlist **lpp;
7177 for (n = half; --n >= 0;) {
7181 q->next = NULL; /* terminate first half of list */
7182 q = msort(list, half); /* sort first half of list */
7183 p = msort(p, len - half); /* sort second half */
7186 #if ENABLE_LOCALE_SUPPORT
7187 if (strcoll(p->text, q->text) < 0)
7189 if (strcmp(p->text, q->text) < 0)
7213 * Sort the results of file name expansion. It calculates the number of
7214 * strings to sort and then calls msort (short for merge sort) to do the
7217 static struct strlist *
7218 expsort(struct strlist *str)
7224 for (sp = str; sp; sp = sp->next)
7226 return msort(str, len);
7230 expandmeta(struct strlist *str /*, int flag*/)
7232 static const char metachars[] ALIGN1 = {
7235 /* TODO - EXP_REDIR */
7239 struct strlist **savelastp;
7245 if (!strpbrk(str->text, metachars))
7247 savelastp = exparg.lastp;
7250 p = preglob(str->text, RMESCAPE_ALLOC | RMESCAPE_HEAP);
7252 int i = strlen(str->text);
7253 //BUGGY estimation of how long expanded name can be
7254 expdir = ckmalloc(i < 2048 ? 2048 : i+1);
7256 expmeta(expdir, expdir, p);
7261 if (exparg.lastp == savelastp) {
7266 *exparg.lastp = str;
7267 rmescapes(str->text, 0);
7268 exparg.lastp = &str->next;
7270 *exparg.lastp = NULL;
7271 *savelastp = sp = expsort(*savelastp);
7272 while (sp->next != NULL)
7274 exparg.lastp = &sp->next;
7279 #endif /* ENABLE_ASH_INTERNAL_GLOB */
7282 * Perform variable substitution and command substitution on an argument,
7283 * placing the resulting list of arguments in arglist. If EXP_FULL is true,
7284 * perform splitting and file name expansion. When arglist is NULL, perform
7285 * here document expansion.
7288 expandarg(union node *arg, struct arglist *arglist, int flag)
7293 argbackq = arg->narg.backquote;
7294 STARTSTACKSTR(expdest);
7295 ifsfirst.next = NULL;
7297 TRACE(("expandarg: argstr('%s',flags:%x)\n", arg->narg.text, flag));
7298 argstr(arg->narg.text, flag,
7299 /* var_str_list: */ arglist ? arglist->list : NULL);
7300 p = _STPUTC('\0', expdest);
7302 if (arglist == NULL) {
7303 return; /* here document expanded */
7305 p = grabstackstr(p);
7306 TRACE(("expandarg: p:'%s'\n", p));
7307 exparg.lastp = &exparg.list;
7311 if (flag & EXP_FULL) {
7312 ifsbreakup(p, &exparg);
7313 *exparg.lastp = NULL;
7314 exparg.lastp = &exparg.list;
7315 expandmeta(exparg.list /*, flag*/);
7317 if (flag & EXP_REDIR) { /*XXX - for now, just remove escapes */
7319 TRACE(("expandarg: rmescapes:'%s'\n", p));
7321 sp = stzalloc(sizeof(*sp));
7324 exparg.lastp = &sp->next;
7328 *exparg.lastp = NULL;
7330 *arglist->lastp = exparg.list;
7331 arglist->lastp = exparg.lastp;
7336 * Expand shell variables and backquotes inside a here document.
7339 expandhere(union node *arg, int fd)
7341 expandarg(arg, (struct arglist *)NULL, EXP_QUOTED);
7342 full_write(fd, stackblock(), expdest - (char *)stackblock());
7346 * Returns true if the pattern matches the string.
7349 patmatch(char *pattern, const char *string)
7351 return pmatch(preglob(pattern, 0), string);
7355 * See if a pattern matches in a case statement.
7358 casematch(union node *pattern, char *val)
7360 struct stackmark smark;
7363 setstackmark(&smark);
7364 argbackq = pattern->narg.backquote;
7365 STARTSTACKSTR(expdest);
7367 argstr(pattern->narg.text, EXP_TILDE | EXP_CASE,
7368 /* var_str_list: */ NULL);
7369 STACKSTRNUL(expdest);
7370 result = patmatch(stackblock(), val);
7371 popstackmark(&smark);
7376 /* ============ find_command */
7380 int (*builtin)(int, char **) FAST_FUNC;
7381 /* unsigned flags; */
7383 #define IS_BUILTIN_SPECIAL(b) ((b)->name[0] & 1)
7384 /* "regular" builtins always take precedence over commands,
7385 * regardless of PATH=....%builtin... position */
7386 #define IS_BUILTIN_REGULAR(b) ((b)->name[0] & 2)
7387 #define IS_BUILTIN_ASSIGN(b) ((b)->name[0] & 4)
7390 smallint cmdtype; /* CMDxxx */
7393 /* index >= 0 for commands without path (slashes) */
7394 /* (TODO: what exactly does the value mean? PATH position?) */
7395 /* index == -1 for commands with slashes */
7396 /* index == (-2 - applet_no) for NOFORK applets */
7397 const struct builtincmd *cmd;
7398 struct funcnode *func;
7401 /* values of cmdtype */
7402 #define CMDUNKNOWN -1 /* no entry in table for command */
7403 #define CMDNORMAL 0 /* command is an executable program */
7404 #define CMDFUNCTION 1 /* command is a shell function */
7405 #define CMDBUILTIN 2 /* command is a shell builtin */
7407 /* action to find_command() */
7408 #define DO_ERR 0x01 /* prints errors */
7409 #define DO_ABS 0x02 /* checks absolute paths */
7410 #define DO_NOFUNC 0x04 /* don't return shell functions, for command */
7411 #define DO_ALTPATH 0x08 /* using alternate path */
7412 #define DO_ALTBLTIN 0x20 /* %builtin in alt. path */
7414 static void find_command(char *, struct cmdentry *, int, const char *);
7417 /* ============ Hashing commands */
7420 * When commands are first encountered, they are entered in a hash table.
7421 * This ensures that a full path search will not have to be done for them
7422 * on each invocation.
7424 * We should investigate converting to a linear search, even though that
7425 * would make the command name "hash" a misnomer.
7429 struct tblentry *next; /* next entry in hash chain */
7430 union param param; /* definition of builtin function */
7431 smallint cmdtype; /* CMDxxx */
7432 char rehash; /* if set, cd done since entry created */
7433 char cmdname[1]; /* name of command */
7436 static struct tblentry **cmdtable;
7437 #define INIT_G_cmdtable() do { \
7438 cmdtable = xzalloc(CMDTABLESIZE * sizeof(cmdtable[0])); \
7441 static int builtinloc = -1; /* index in path of %builtin, or -1 */
7445 tryexec(IF_FEATURE_SH_STANDALONE(int applet_no,) char *cmd, char **argv, char **envp)
7447 #if ENABLE_FEATURE_SH_STANDALONE
7448 if (applet_no >= 0) {
7449 if (APPLET_IS_NOEXEC(applet_no)) {
7453 run_applet_no_and_exit(applet_no, argv);
7455 /* re-exec ourselves with the new arguments */
7456 execve(bb_busybox_exec_path, argv, envp);
7457 /* If they called chroot or otherwise made the binary no longer
7458 * executable, fall through */
7465 execve(cmd, argv, envp);
7466 } while (errno == EINTR);
7468 execve(cmd, argv, envp);
7470 if (cmd == (char*) bb_busybox_exec_path) {
7471 /* We already visited ENOEXEC branch below, don't do it again */
7472 //TODO: try execve(initial_argv0_of_shell, argv, envp) before giving up?
7476 if (errno == ENOEXEC) {
7477 /* Run "cmd" as a shell script:
7478 * http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html
7479 * "If the execve() function fails with ENOEXEC, the shell
7480 * shall execute a command equivalent to having a shell invoked
7481 * with the command name as its first operand,
7482 * with any remaining arguments passed to the new shell"
7484 * That is, do not use $SHELL, user's shell, or /bin/sh;
7485 * just call ourselves.
7487 * Note that bash reads ~80 chars of the file, and if it sees
7488 * a zero byte before it sees newline, it doesn't try to
7489 * interpret it, but fails with "cannot execute binary file"
7490 * message and exit code 126. For one, this prevents attempts
7491 * to interpret foreign ELF binaries as shell scripts.
7496 for (ap = argv; *ap; ap++)
7498 new = ckmalloc((ap - argv + 2) * sizeof(new[0]));
7499 new[0] = (char*) "ash";
7502 while ((*ap++ = *++argv) != NULL)
7504 cmd = (char*) bb_busybox_exec_path;
7511 * Exec a program. Never returns. If you change this routine, you may
7512 * have to change the find_command routine as well.
7514 static void shellexec(char **, const char *, int) NORETURN;
7516 shellexec(char **argv, const char *path, int idx)
7522 int applet_no = -1; /* used only by FEATURE_SH_STANDALONE */
7524 envp = listvars(VEXPORT, VUNSET, /*end:*/ NULL);
7525 if (strchr(argv[0], '/') != NULL
7526 #if ENABLE_FEATURE_SH_STANDALONE
7527 || (applet_no = find_applet_by_name(argv[0])) >= 0
7530 tryexec(IF_FEATURE_SH_STANDALONE(applet_no,) argv[0], argv, envp);
7531 if (applet_no >= 0) {
7532 /* We tried execing ourself, but it didn't work.
7533 * Maybe /proc/self/exe doesn't exist?
7542 while ((cmdname = path_advance(&path, argv[0])) != NULL) {
7543 if (--idx < 0 && pathopt == NULL) {
7544 tryexec(IF_FEATURE_SH_STANDALONE(-1,) cmdname, argv, envp);
7545 if (errno != ENOENT && errno != ENOTDIR)
7552 /* Map to POSIX errors */
7564 exitstatus = exerrno;
7565 TRACE(("shellexec failed for %s, errno %d, suppress_int %d\n",
7566 argv[0], e, suppress_int));
7567 ash_msg_and_raise(EXEXIT, "%s: %s", argv[0], errmsg(e, "not found"));
7572 printentry(struct tblentry *cmdp)
7578 idx = cmdp->param.index;
7581 name = path_advance(&path, cmdp->cmdname);
7583 } while (--idx >= 0);
7584 out1fmt("%s%s\n", name, (cmdp->rehash ? "*" : nullstr));
7588 * Clear out command entries. The argument specifies the first entry in
7589 * PATH which has changed.
7592 clearcmdentry(int firstchange)
7594 struct tblentry **tblp;
7595 struct tblentry **pp;
7596 struct tblentry *cmdp;
7599 for (tblp = cmdtable; tblp < &cmdtable[CMDTABLESIZE]; tblp++) {
7601 while ((cmdp = *pp) != NULL) {
7602 if ((cmdp->cmdtype == CMDNORMAL &&
7603 cmdp->param.index >= firstchange)
7604 || (cmdp->cmdtype == CMDBUILTIN &&
7605 builtinloc >= firstchange)
7618 * Locate a command in the command hash table. If "add" is nonzero,
7619 * add the command to the table if it is not already present. The
7620 * variable "lastcmdentry" is set to point to the address of the link
7621 * pointing to the entry, so that delete_cmd_entry can delete the
7624 * Interrupts must be off if called with add != 0.
7626 static struct tblentry **lastcmdentry;
7628 static struct tblentry *
7629 cmdlookup(const char *name, int add)
7631 unsigned int hashval;
7633 struct tblentry *cmdp;
7634 struct tblentry **pp;
7637 hashval = (unsigned char)*p << 4;
7639 hashval += (unsigned char)*p++;
7641 pp = &cmdtable[hashval % CMDTABLESIZE];
7642 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7643 if (strcmp(cmdp->cmdname, name) == 0)
7647 if (add && cmdp == NULL) {
7648 cmdp = *pp = ckzalloc(sizeof(struct tblentry)
7650 /* + 1 - already done because
7651 * tblentry::cmdname is char[1] */);
7652 /*cmdp->next = NULL; - ckzalloc did it */
7653 cmdp->cmdtype = CMDUNKNOWN;
7654 strcpy(cmdp->cmdname, name);
7661 * Delete the command entry returned on the last lookup.
7664 delete_cmd_entry(void)
7666 struct tblentry *cmdp;
7669 cmdp = *lastcmdentry;
7670 *lastcmdentry = cmdp->next;
7671 if (cmdp->cmdtype == CMDFUNCTION)
7672 freefunc(cmdp->param.func);
7678 * Add a new command entry, replacing any existing command entry for
7679 * the same name - except special builtins.
7682 addcmdentry(char *name, struct cmdentry *entry)
7684 struct tblentry *cmdp;
7686 cmdp = cmdlookup(name, 1);
7687 if (cmdp->cmdtype == CMDFUNCTION) {
7688 freefunc(cmdp->param.func);
7690 cmdp->cmdtype = entry->cmdtype;
7691 cmdp->param = entry->u;
7695 static int FAST_FUNC
7696 hashcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
7698 struct tblentry **pp;
7699 struct tblentry *cmdp;
7701 struct cmdentry entry;
7704 if (nextopt("r") != '\0') {
7709 if (*argptr == NULL) {
7710 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
7711 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7712 if (cmdp->cmdtype == CMDNORMAL)
7720 while ((name = *argptr) != NULL) {
7721 cmdp = cmdlookup(name, 0);
7723 && (cmdp->cmdtype == CMDNORMAL
7724 || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))
7728 find_command(name, &entry, DO_ERR, pathval());
7729 if (entry.cmdtype == CMDUNKNOWN)
7737 * Called when a cd is done. Marks all commands so the next time they
7738 * are executed they will be rehashed.
7743 struct tblentry **pp;
7744 struct tblentry *cmdp;
7746 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
7747 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7748 if (cmdp->cmdtype == CMDNORMAL
7749 || (cmdp->cmdtype == CMDBUILTIN
7750 && !IS_BUILTIN_REGULAR(cmdp->param.cmd)
7760 * Fix command hash table when PATH changed.
7761 * Called before PATH is changed. The argument is the new value of PATH;
7762 * pathval() still returns the old value at this point.
7763 * Called with interrupts off.
7765 static void FAST_FUNC
7766 changepath(const char *new)
7774 firstchange = 9999; /* assume no change */
7780 if ((*old == '\0' && *new == ':')
7781 || (*old == ':' && *new == '\0')
7785 old = new; /* ignore subsequent differences */
7789 if (*new == '%' && idx_bltin < 0 && prefix(new + 1, "builtin"))
7796 if (builtinloc < 0 && idx_bltin >= 0)
7797 builtinloc = idx_bltin; /* zap builtins */
7798 if (builtinloc >= 0 && idx_bltin < 0)
7800 clearcmdentry(firstchange);
7801 builtinloc = idx_bltin;
7826 #if ENABLE_ASH_BASH_COMPAT
7837 typedef smallint token_id_t;
7839 /* Nth bit indicates if token marks the end of a list */
7842 /* 0 */ | (1u << TEOF)
7843 /* 1 */ | (0u << TNL)
7844 /* 2 */ | (0u << TREDIR)
7845 /* 3 */ | (0u << TWORD)
7846 /* 4 */ | (0u << TSEMI)
7847 /* 5 */ | (0u << TBACKGND)
7848 /* 6 */ | (0u << TAND)
7849 /* 7 */ | (0u << TOR)
7850 /* 8 */ | (0u << TPIPE)
7851 /* 9 */ | (0u << TLP)
7852 /* 10 */ | (1u << TRP)
7853 /* 11 */ | (1u << TENDCASE)
7854 /* 12 */ | (1u << TENDBQUOTE)
7855 /* 13 */ | (0u << TNOT)
7856 /* 14 */ | (0u << TCASE)
7857 /* 15 */ | (1u << TDO)
7858 /* 16 */ | (1u << TDONE)
7859 /* 17 */ | (1u << TELIF)
7860 /* 18 */ | (1u << TELSE)
7861 /* 19 */ | (1u << TESAC)
7862 /* 20 */ | (1u << TFI)
7863 /* 21 */ | (0u << TFOR)
7864 #if ENABLE_ASH_BASH_COMPAT
7865 /* 22 */ | (0u << TFUNCTION)
7867 /* 23 */ | (0u << TIF)
7868 /* 24 */ | (0u << TIN)
7869 /* 25 */ | (1u << TTHEN)
7870 /* 26 */ | (0u << TUNTIL)
7871 /* 27 */ | (0u << TWHILE)
7872 /* 28 */ | (0u << TBEGIN)
7873 /* 29 */ | (1u << TEND)
7874 , /* thus far 29 bits used */
7877 static const char *const tokname_array[] = {
7891 #define KWDOFFSET 13
7892 /* the following are keywords */
7902 #if ENABLE_ASH_BASH_COMPAT
7914 /* Wrapper around strcmp for qsort/bsearch/... */
7916 pstrcmp(const void *a, const void *b)
7918 return strcmp((char*)a, *(char**)b);
7921 static const char *const *
7922 findkwd(const char *s)
7924 return bsearch(s, tokname_array + KWDOFFSET,
7925 ARRAY_SIZE(tokname_array) - KWDOFFSET,
7926 sizeof(tokname_array[0]), pstrcmp);
7930 * Locate and print what a word is...
7933 describe_command(char *command, const char *path, int describe_command_verbose)
7935 struct cmdentry entry;
7936 struct tblentry *cmdp;
7937 #if ENABLE_ASH_ALIAS
7938 const struct alias *ap;
7941 path = path ? path : pathval();
7943 if (describe_command_verbose) {
7947 /* First look at the keywords */
7948 if (findkwd(command)) {
7949 out1str(describe_command_verbose ? " is a shell keyword" : command);
7953 #if ENABLE_ASH_ALIAS
7954 /* Then look at the aliases */
7955 ap = lookupalias(command, 0);
7957 if (!describe_command_verbose) {
7962 out1fmt(" is an alias for %s", ap->val);
7966 /* Then check if it is a tracked alias */
7967 cmdp = cmdlookup(command, 0);
7969 entry.cmdtype = cmdp->cmdtype;
7970 entry.u = cmdp->param;
7972 /* Finally use brute force */
7973 find_command(command, &entry, DO_ABS, path);
7976 switch (entry.cmdtype) {
7978 int j = entry.u.index;
7984 p = path_advance(&path, command);
7988 if (describe_command_verbose) {
7990 (cmdp ? " a tracked alias for" : nullstr), p
7999 if (describe_command_verbose) {
8000 out1str(" is a shell function");
8007 if (describe_command_verbose) {
8008 out1fmt(" is a %sshell builtin",
8009 IS_BUILTIN_SPECIAL(entry.u.cmd) ?
8010 "special " : nullstr
8018 if (describe_command_verbose) {
8019 out1str(": not found\n");
8028 static int FAST_FUNC
8029 typecmd(int argc UNUSED_PARAM, char **argv)
8035 /* type -p ... ? (we don't bother checking for 'p') */
8036 if (argv[1] && argv[1][0] == '-') {
8041 err |= describe_command(argv[i++], NULL, verbose);
8046 #if ENABLE_ASH_CMDCMD
8047 /* Is it "command [-p] PROG ARGS" bltin, no other opts? Return ptr to "PROG" if yes */
8049 parse_command_args(char **argv, const char **path)
8062 if (c == '-' && !*cp) {
8070 *path = bb_default_path;
8073 /* run 'typecmd' for other options */
8082 static int FAST_FUNC
8083 commandcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
8091 const char *path = NULL;
8093 /* "command [-p] PROG ARGS" (that is, without -V or -v)
8094 * never reaches this function.
8097 while ((c = nextopt("pvV")) != '\0')
8099 verify |= VERIFY_VERBOSE;
8101 /*verify |= VERIFY_BRIEF*/;
8107 path = bb_default_path;
8109 /* Mimic bash: just "command -v" doesn't complain, it's a nop */
8111 if (/*verify && */ cmd)
8112 return describe_command(cmd, path, verify /* - VERIFY_BRIEF*/);
8119 /*static int funcblocksize; // size of structures in function */
8120 /*static int funcstringsize; // size of strings in node */
8121 static void *funcblock; /* block to allocate function from */
8122 static char *funcstring_end; /* end of block to allocate strings from */
8124 /* flags in argument to evaltree */
8125 #define EV_EXIT 01 /* exit after evaluating tree */
8126 #define EV_TESTED 02 /* exit status is checked; ignore -e flag */
8128 static const uint8_t nodesize[N_NUMBER] ALIGN1 = {
8129 [NCMD ] = SHELL_ALIGN(sizeof(struct ncmd)),
8130 [NPIPE ] = SHELL_ALIGN(sizeof(struct npipe)),
8131 [NREDIR ] = SHELL_ALIGN(sizeof(struct nredir)),
8132 [NBACKGND ] = SHELL_ALIGN(sizeof(struct nredir)),
8133 [NSUBSHELL] = SHELL_ALIGN(sizeof(struct nredir)),
8134 [NAND ] = SHELL_ALIGN(sizeof(struct nbinary)),
8135 [NOR ] = SHELL_ALIGN(sizeof(struct nbinary)),
8136 [NSEMI ] = SHELL_ALIGN(sizeof(struct nbinary)),
8137 [NIF ] = SHELL_ALIGN(sizeof(struct nif)),
8138 [NWHILE ] = SHELL_ALIGN(sizeof(struct nbinary)),
8139 [NUNTIL ] = SHELL_ALIGN(sizeof(struct nbinary)),
8140 [NFOR ] = SHELL_ALIGN(sizeof(struct nfor)),
8141 [NCASE ] = SHELL_ALIGN(sizeof(struct ncase)),
8142 [NCLIST ] = SHELL_ALIGN(sizeof(struct nclist)),
8143 [NDEFUN ] = SHELL_ALIGN(sizeof(struct narg)),
8144 [NARG ] = SHELL_ALIGN(sizeof(struct narg)),
8145 [NTO ] = SHELL_ALIGN(sizeof(struct nfile)),
8146 #if ENABLE_ASH_BASH_COMPAT
8147 [NTO2 ] = SHELL_ALIGN(sizeof(struct nfile)),
8149 [NCLOBBER ] = SHELL_ALIGN(sizeof(struct nfile)),
8150 [NFROM ] = SHELL_ALIGN(sizeof(struct nfile)),
8151 [NFROMTO ] = SHELL_ALIGN(sizeof(struct nfile)),
8152 [NAPPEND ] = SHELL_ALIGN(sizeof(struct nfile)),
8153 [NTOFD ] = SHELL_ALIGN(sizeof(struct ndup)),
8154 [NFROMFD ] = SHELL_ALIGN(sizeof(struct ndup)),
8155 [NHERE ] = SHELL_ALIGN(sizeof(struct nhere)),
8156 [NXHERE ] = SHELL_ALIGN(sizeof(struct nhere)),
8157 [NNOT ] = SHELL_ALIGN(sizeof(struct nnot)),
8160 static int calcsize(int funcblocksize, union node *n);
8163 sizenodelist(int funcblocksize, struct nodelist *lp)
8166 funcblocksize += SHELL_ALIGN(sizeof(struct nodelist));
8167 funcblocksize = calcsize(funcblocksize, lp->n);
8170 return funcblocksize;
8174 calcsize(int funcblocksize, union node *n)
8177 return funcblocksize;
8178 funcblocksize += nodesize[n->type];
8181 funcblocksize = calcsize(funcblocksize, n->ncmd.redirect);
8182 funcblocksize = calcsize(funcblocksize, n->ncmd.args);
8183 funcblocksize = calcsize(funcblocksize, n->ncmd.assign);
8186 funcblocksize = sizenodelist(funcblocksize, n->npipe.cmdlist);
8191 funcblocksize = calcsize(funcblocksize, n->nredir.redirect);
8192 funcblocksize = calcsize(funcblocksize, n->nredir.n);
8199 funcblocksize = calcsize(funcblocksize, n->nbinary.ch2);
8200 funcblocksize = calcsize(funcblocksize, n->nbinary.ch1);
8203 funcblocksize = calcsize(funcblocksize, n->nif.elsepart);
8204 funcblocksize = calcsize(funcblocksize, n->nif.ifpart);
8205 funcblocksize = calcsize(funcblocksize, n->nif.test);
8208 funcblocksize += SHELL_ALIGN(strlen(n->nfor.var) + 1); /* was funcstringsize += ... */
8209 funcblocksize = calcsize(funcblocksize, n->nfor.body);
8210 funcblocksize = calcsize(funcblocksize, n->nfor.args);
8213 funcblocksize = calcsize(funcblocksize, n->ncase.cases);
8214 funcblocksize = calcsize(funcblocksize, n->ncase.expr);
8217 funcblocksize = calcsize(funcblocksize, n->nclist.body);
8218 funcblocksize = calcsize(funcblocksize, n->nclist.pattern);
8219 funcblocksize = calcsize(funcblocksize, n->nclist.next);
8223 funcblocksize = sizenodelist(funcblocksize, n->narg.backquote);
8224 funcblocksize += SHELL_ALIGN(strlen(n->narg.text) + 1); /* was funcstringsize += ... */
8225 funcblocksize = calcsize(funcblocksize, n->narg.next);
8228 #if ENABLE_ASH_BASH_COMPAT
8235 funcblocksize = calcsize(funcblocksize, n->nfile.fname);
8236 funcblocksize = calcsize(funcblocksize, n->nfile.next);
8240 funcblocksize = calcsize(funcblocksize, n->ndup.vname);
8241 funcblocksize = calcsize(funcblocksize, n->ndup.next);
8245 funcblocksize = calcsize(funcblocksize, n->nhere.doc);
8246 funcblocksize = calcsize(funcblocksize, n->nhere.next);
8249 funcblocksize = calcsize(funcblocksize, n->nnot.com);
8252 return funcblocksize;
8256 nodeckstrdup(char *s)
8258 funcstring_end -= SHELL_ALIGN(strlen(s) + 1);
8259 return strcpy(funcstring_end, s);
8262 static union node *copynode(union node *);
8264 static struct nodelist *
8265 copynodelist(struct nodelist *lp)
8267 struct nodelist *start;
8268 struct nodelist **lpp;
8273 funcblock = (char *) funcblock + SHELL_ALIGN(sizeof(struct nodelist));
8274 (*lpp)->n = copynode(lp->n);
8276 lpp = &(*lpp)->next;
8283 copynode(union node *n)
8290 funcblock = (char *) funcblock + nodesize[n->type];
8294 new->ncmd.redirect = copynode(n->ncmd.redirect);
8295 new->ncmd.args = copynode(n->ncmd.args);
8296 new->ncmd.assign = copynode(n->ncmd.assign);
8299 new->npipe.cmdlist = copynodelist(n->npipe.cmdlist);
8300 new->npipe.pipe_backgnd = n->npipe.pipe_backgnd;
8305 new->nredir.redirect = copynode(n->nredir.redirect);
8306 new->nredir.n = copynode(n->nredir.n);
8313 new->nbinary.ch2 = copynode(n->nbinary.ch2);
8314 new->nbinary.ch1 = copynode(n->nbinary.ch1);
8317 new->nif.elsepart = copynode(n->nif.elsepart);
8318 new->nif.ifpart = copynode(n->nif.ifpart);
8319 new->nif.test = copynode(n->nif.test);
8322 new->nfor.var = nodeckstrdup(n->nfor.var);
8323 new->nfor.body = copynode(n->nfor.body);
8324 new->nfor.args = copynode(n->nfor.args);
8327 new->ncase.cases = copynode(n->ncase.cases);
8328 new->ncase.expr = copynode(n->ncase.expr);
8331 new->nclist.body = copynode(n->nclist.body);
8332 new->nclist.pattern = copynode(n->nclist.pattern);
8333 new->nclist.next = copynode(n->nclist.next);
8337 new->narg.backquote = copynodelist(n->narg.backquote);
8338 new->narg.text = nodeckstrdup(n->narg.text);
8339 new->narg.next = copynode(n->narg.next);
8342 #if ENABLE_ASH_BASH_COMPAT
8349 new->nfile.fname = copynode(n->nfile.fname);
8350 new->nfile.fd = n->nfile.fd;
8351 new->nfile.next = copynode(n->nfile.next);
8355 new->ndup.vname = copynode(n->ndup.vname);
8356 new->ndup.dupfd = n->ndup.dupfd;
8357 new->ndup.fd = n->ndup.fd;
8358 new->ndup.next = copynode(n->ndup.next);
8362 new->nhere.doc = copynode(n->nhere.doc);
8363 new->nhere.fd = n->nhere.fd;
8364 new->nhere.next = copynode(n->nhere.next);
8367 new->nnot.com = copynode(n->nnot.com);
8370 new->type = n->type;
8375 * Make a copy of a parse tree.
8377 static struct funcnode *
8378 copyfunc(union node *n)
8383 /*funcstringsize = 0;*/
8384 blocksize = offsetof(struct funcnode, n) + calcsize(0, n);
8385 f = ckzalloc(blocksize /* + funcstringsize */);
8386 funcblock = (char *) f + offsetof(struct funcnode, n);
8387 funcstring_end = (char *) f + blocksize;
8389 /* f->count = 0; - ckzalloc did it */
8394 * Define a shell function.
8397 defun(union node *func)
8399 struct cmdentry entry;
8402 entry.cmdtype = CMDFUNCTION;
8403 entry.u.func = copyfunc(func);
8404 addcmdentry(func->narg.text, &entry);
8408 /* Reasons for skipping commands (see comment on breakcmd routine) */
8409 #define SKIPBREAK (1 << 0)
8410 #define SKIPCONT (1 << 1)
8411 #define SKIPFUNC (1 << 2)
8412 static smallint evalskip; /* set to SKIPxxx if we are skipping commands */
8413 static int skipcount; /* number of levels to skip */
8414 static int funcnest; /* depth of function calls */
8415 static int loopnest; /* current loop nesting level */
8417 /* Forward decl way out to parsing code - dotrap needs it */
8418 static int evalstring(char *s, int flags);
8420 /* Called to execute a trap.
8421 * Single callsite - at the end of evaltree().
8422 * If we return non-zero, evaltree raises EXEXIT exception.
8424 * Perhaps we should avoid entering new trap handlers
8425 * while we are executing a trap handler. [is it a TODO?]
8432 uint8_t last_status;
8437 last_status = exitstatus;
8441 TRACE(("dotrap entered\n"));
8442 for (sig = 1, g = gotsig; sig < NSIG; sig++, g++) {
8454 /* non-trapped SIGINT is handled separately by raise_interrupt,
8455 * don't upset it by resetting gotsig[SIGINT-1] */
8456 if (sig == SIGINT && !p)
8459 TRACE(("sig %d is active, will run handler '%s'\n", sig, p));
8465 exitstatus = last_status;
8466 TRACE(("dotrap returns\n"));
8469 /* forward declarations - evaluation is fairly recursive business... */
8470 static int evalloop(union node *, int);
8471 static int evalfor(union node *, int);
8472 static int evalcase(union node *, int);
8473 static int evalsubshell(union node *, int);
8474 static void expredir(union node *);
8475 static int evalpipe(union node *, int);
8476 static int evalcommand(union node *, int);
8477 static int evalbltin(const struct builtincmd *, int, char **, int);
8478 static void prehash(union node *);
8481 * Evaluate a parse tree. The value is left in the global variable
8485 evaltree(union node *n, int flags)
8487 struct jmploc *volatile savehandler = exception_handler;
8488 struct jmploc jmploc;
8490 int (*evalfn)(union node *, int);
8494 SAVE_INT(int_level);
8497 TRACE(("evaltree(NULL) called\n"));
8500 TRACE(("evaltree(%p: %d, %d) called\n", n, n->type, flags));
8504 exception_handler = &jmploc;
8506 int err = setjmp(jmploc.loc);
8508 /* if it was a signal, check for trap handlers */
8509 if (exception_type == EXSIG) {
8510 TRACE(("exception %d (EXSIG) in evaltree, err=%d\n",
8511 exception_type, err));
8514 /* continue on the way out */
8515 TRACE(("exception %d in evaltree, propagating err=%d\n",
8516 exception_type, err));
8517 exception_handler = savehandler;
8518 longjmp(exception_handler->loc, err);
8525 out1fmt("Node type = %d\n", n->type);
8530 status = !evaltree(n->nnot.com, EV_TESTED);
8533 expredir(n->nredir.redirect);
8534 status = redirectsafe(n->nredir.redirect, REDIR_PUSH);
8536 status = evaltree(n->nredir.n, flags & EV_TESTED);
8538 if (n->nredir.redirect)
8539 popredir(/*drop:*/ 0, /*restore:*/ 0 /* not sure */);
8542 evalfn = evalcommand;
8544 if (eflag && !(flags & EV_TESTED))
8556 evalfn = evalsubshell;
8569 #error NAND + 1 != NOR
8571 #if NOR + 1 != NSEMI
8572 #error NOR + 1 != NSEMI
8574 unsigned is_or = n->type - NAND;
8577 (flags | ((is_or >> 1) - 1)) & EV_TESTED
8579 if ((!status) == is_or || evalskip)
8585 status = evalfn(n, flags);
8589 status = evaltree(n->nif.test, EV_TESTED);
8596 if (n->nif.elsepart) {
8597 n = n->nif.elsepart;
8604 /* Not necessary. To test it:
8605 * "false; f() { qwerty; }; echo $?" should print 0.
8609 exitstatus = status;
8614 exception_handler = savehandler;
8617 /* Order of checks below is important:
8618 * signal handlers trigger before exit caused by "set -e".
8622 if (checkexit & status)
8623 raise_exception(EXEXIT);
8624 if (flags & EV_EXIT)
8625 raise_exception(EXEXIT);
8627 RESTORE_INT(int_level);
8628 TRACE(("leaving evaltree (no interrupts)\n"));
8633 #if !defined(__alpha__) || (defined(__GNUC__) && __GNUC__ >= 3)
8636 int evaltreenr(union node *, int) __attribute__ ((alias("evaltree"),__noreturn__));
8641 int skip = evalskip;
8648 if (--skipcount <= 0) {
8659 evalloop(union node *n, int flags)
8670 i = evaltree(n->nbinary.ch1, EV_TESTED);
8672 if (skip == SKIPFUNC)
8676 if (n->type != NWHILE)
8680 status = evaltree(n->nbinary.ch2, flags);
8682 } while (!(skip & ~SKIPCONT));
8689 evalfor(union node *n, int flags)
8691 struct arglist arglist;
8694 struct stackmark smark;
8697 setstackmark(&smark);
8698 arglist.list = NULL;
8699 arglist.lastp = &arglist.list;
8700 for (argp = n->nfor.args; argp; argp = argp->narg.next) {
8701 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
8703 *arglist.lastp = NULL;
8707 for (sp = arglist.list; sp; sp = sp->next) {
8708 setvar0(n->nfor.var, sp->text);
8709 status = evaltree(n->nfor.body, flags);
8710 if (skiploop() & ~SKIPCONT)
8714 popstackmark(&smark);
8720 evalcase(union node *n, int flags)
8724 struct arglist arglist;
8725 struct stackmark smark;
8728 setstackmark(&smark);
8729 arglist.list = NULL;
8730 arglist.lastp = &arglist.list;
8731 expandarg(n->ncase.expr, &arglist, EXP_TILDE);
8732 for (cp = n->ncase.cases; cp && evalskip == 0; cp = cp->nclist.next) {
8733 for (patp = cp->nclist.pattern; patp; patp = patp->narg.next) {
8734 if (casematch(patp, arglist.list->text)) {
8735 /* Ensure body is non-empty as otherwise
8736 * EV_EXIT may prevent us from setting the
8739 if (evalskip == 0 && cp->nclist.body) {
8740 status = evaltree(cp->nclist.body, flags);
8747 popstackmark(&smark);
8753 * Kick off a subshell to evaluate a tree.
8756 evalsubshell(union node *n, int flags)
8759 int backgnd = (n->type == NBACKGND);
8762 expredir(n->nredir.redirect);
8763 if (!backgnd && (flags & EV_EXIT) && !may_have_traps)
8766 jp = makejob(/*n,*/ 1);
8767 if (forkshell(jp, n, backgnd) == 0) {
8772 flags &= ~EV_TESTED;
8774 redirect(n->nredir.redirect, 0);
8775 evaltreenr(n->nredir.n, flags);
8780 status = waitforjob(jp);
8786 * Compute the names of the files in a redirection list.
8788 static void fixredir(union node *, const char *, int);
8790 expredir(union node *n)
8794 for (redir = n; redir; redir = redir->nfile.next) {
8798 fn.lastp = &fn.list;
8799 switch (redir->type) {
8803 #if ENABLE_ASH_BASH_COMPAT
8808 expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR);
8809 TRACE(("expredir expanded to '%s'\n", fn.list->text));
8810 #if ENABLE_ASH_BASH_COMPAT
8814 // By the design of stack allocator, the loop of this kind:
8815 // while true; do while true; do break; done </dev/null; done
8816 // will look like a memory leak: ash plans to free expfname's
8817 // of "/dev/null" as soon as it finishes running the loop
8818 // (in this case, never).
8819 // This "fix" is wrong:
8820 if (redir->nfile.expfname)
8821 stunalloc(redir->nfile.expfname);
8822 // It results in corrupted state of stacked allocations.
8824 redir->nfile.expfname = fn.list->text;
8827 case NTOFD: /* >& */
8828 if (redir->ndup.vname) {
8829 expandarg(redir->ndup.vname, &fn, EXP_FULL | EXP_TILDE);
8830 if (fn.list == NULL)
8831 ash_msg_and_raise_error("redir error");
8832 #if ENABLE_ASH_BASH_COMPAT
8833 //FIXME: we used expandarg with different args!
8834 if (!isdigit_str9(fn.list->text)) {
8835 /* >&file, not >&fd */
8836 if (redir->nfile.fd != 1) /* 123>&file - BAD */
8837 ash_msg_and_raise_error("redir error");
8839 goto store_expfname;
8842 fixredir(redir, fn.list->text, 1);
8850 * Evaluate a pipeline. All the processes in the pipeline are children
8851 * of the process creating the pipeline. (This differs from some versions
8852 * of the shell, which make the last process in a pipeline the parent
8856 evalpipe(union node *n, int flags)
8859 struct nodelist *lp;
8865 TRACE(("evalpipe(0x%lx) called\n", (long)n));
8867 for (lp = n->npipe.cmdlist; lp; lp = lp->next)
8871 jp = makejob(/*n,*/ pipelen);
8873 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
8877 if (pipe(pip) < 0) {
8879 ash_msg_and_raise_error("pipe call failed");
8882 if (forkshell(jp, lp->n, n->npipe.pipe_backgnd) == 0) {
8895 evaltreenr(lp->n, flags);
8901 /* Don't want to trigger debugging */
8905 if (n->npipe.pipe_backgnd == 0) {
8906 status = waitforjob(jp);
8907 TRACE(("evalpipe: job done exit status %d\n", status));
8915 * Controls whether the shell is interactive or not.
8918 setinteractive(int on)
8920 static smallint is_interactive;
8922 if (++on == is_interactive)
8924 is_interactive = on;
8928 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
8929 if (is_interactive > 1) {
8930 /* Looks like they want an interactive shell */
8931 static smallint did_banner;
8934 /* note: ash and hush share this string */
8935 out1fmt("\n\n%s %s\n"
8936 IF_ASH_HELP("Enter 'help' for a list of built-in commands.\n")
8939 "built-in shell (ash)"
8953 setinteractive(iflag);
8955 #if ENABLE_FEATURE_EDITING_VI
8957 line_input_state->flags |= VI_MODE;
8959 line_input_state->flags &= ~VI_MODE;
8961 viflag = 0; /* forcibly keep the option off */
8965 static struct localvar *localvars;
8968 * Called after a function returns.
8969 * Interrupts must be off.
8974 struct localvar *lvp;
8977 while ((lvp = localvars) != NULL) {
8978 localvars = lvp->next;
8980 TRACE(("poplocalvar %s\n", vp ? vp->var_text : "-"));
8981 if (vp == NULL) { /* $- saved */
8982 memcpy(optlist, lvp->text, sizeof(optlist));
8983 free((char*)lvp->text);
8985 } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) {
8986 unsetvar(vp->var_text);
8989 vp->var_func(var_end(lvp->text));
8990 if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
8991 free((char*)vp->var_text);
8992 vp->flags = lvp->flags;
8993 vp->var_text = lvp->text;
9000 evalfun(struct funcnode *func, int argc, char **argv, int flags)
9002 volatile struct shparam saveparam;
9003 struct localvar *volatile savelocalvars;
9004 struct jmploc *volatile savehandler;
9005 struct jmploc jmploc;
9008 saveparam = shellparam;
9009 savelocalvars = localvars;
9010 savehandler = exception_handler;
9011 e = setjmp(jmploc.loc);
9016 exception_handler = &jmploc;
9018 shellparam.malloced = 0;
9022 shellparam.nparam = argc - 1;
9023 shellparam.p = argv + 1;
9024 #if ENABLE_ASH_GETOPTS
9025 shellparam.optind = 1;
9026 shellparam.optoff = -1;
9028 evaltree(func->n.narg.next, flags & EV_TESTED);
9034 localvars = savelocalvars;
9035 freeparam(&shellparam);
9036 shellparam = saveparam;
9037 exception_handler = savehandler;
9039 evalskip &= ~SKIPFUNC;
9044 * Make a variable a local variable. When a variable is made local, it's
9045 * value and flags are saved in a localvar structure. The saved values
9046 * will be restored when the shell function returns. We handle the name
9047 * "-" as a special case: it makes changes to "set +-options" local
9048 * (options will be restored on return from the function).
9053 struct localvar *lvp;
9056 char *eq = strchr(name, '=');
9059 /* Cater for duplicate "local". Examples:
9060 * x=0; f() { local x=1; echo $x; local x; echo $x; }; f; echo $x
9061 * x=0; f() { local x=1; echo $x; local x=2; echo $x; }; f; echo $x
9065 if (lvp->vp && varcmp(lvp->vp->var_text, name) == 0) {
9069 * it's a duplicate "local VAR" declaration, do nothing
9076 lvp = ckzalloc(sizeof(*lvp));
9077 if (LONE_DASH(name)) {
9079 p = ckmalloc(sizeof(optlist));
9080 lvp->text = memcpy(p, optlist, sizeof(optlist));
9083 vpp = hashvar(name);
9084 vp = *findvar(vpp, name);
9086 /* variable did not exist yet */
9088 setvareq(name, VSTRFIXED);
9090 setvar(name, NULL, VSTRFIXED);
9091 vp = *vpp; /* the new variable */
9092 lvp->flags = VUNSET;
9094 lvp->text = vp->var_text;
9095 lvp->flags = vp->flags;
9096 /* make sure neither "struct var" nor string gets freed
9097 * during (un)setting:
9099 vp->flags |= VSTRFIXED|VTEXTFIXED;
9103 /* "local VAR" unsets VAR: */
9104 setvar0(name, NULL);
9108 lvp->next = localvars;
9114 * The "local" command.
9116 static int FAST_FUNC
9117 localcmd(int argc UNUSED_PARAM, char **argv)
9122 ash_msg_and_raise_error("not in a function");
9125 while ((name = *argv++) != NULL) {
9131 static int FAST_FUNC
9132 falsecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
9137 static int FAST_FUNC
9138 truecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
9143 static int FAST_FUNC
9144 execcmd(int argc UNUSED_PARAM, char **argv)
9147 iflag = 0; /* exit on error */
9150 /* We should set up signals for "exec CMD"
9151 * the same way as for "CMD" without "exec".
9152 * But optschanged->setinteractive->setsignal
9153 * still thought we are a root shell. Therefore, for example,
9154 * SIGQUIT is still set to IGN. Fix it:
9158 /*setsignal(SIGTERM); - unnecessary because of iflag=0 */
9159 /*setsignal(SIGTSTP); - unnecessary because of mflag=0 */
9160 /*setsignal(SIGTTOU); - unnecessary because of mflag=0 */
9162 shellexec(argv + 1, pathval(), 0);
9169 * The return command.
9171 static int FAST_FUNC
9172 returncmd(int argc UNUSED_PARAM, char **argv)
9175 * If called outside a function, do what ksh does;
9176 * skip the rest of the file.
9178 evalskip = SKIPFUNC;
9179 return argv[1] ? number(argv[1]) : exitstatus;
9182 /* Forward declarations for builtintab[] */
9183 static int breakcmd(int, char **) FAST_FUNC;
9184 static int dotcmd(int, char **) FAST_FUNC;
9185 static int evalcmd(int, char **, int) FAST_FUNC;
9186 static int exitcmd(int, char **) FAST_FUNC;
9187 static int exportcmd(int, char **) FAST_FUNC;
9188 #if ENABLE_ASH_GETOPTS
9189 static int getoptscmd(int, char **) FAST_FUNC;
9192 static int helpcmd(int, char **) FAST_FUNC;
9195 static int historycmd(int, char **) FAST_FUNC;
9197 #if ENABLE_SH_MATH_SUPPORT
9198 static int letcmd(int, char **) FAST_FUNC;
9200 static int readcmd(int, char **) FAST_FUNC;
9201 static int setcmd(int, char **) FAST_FUNC;
9202 static int shiftcmd(int, char **) FAST_FUNC;
9203 static int timescmd(int, char **) FAST_FUNC;
9204 static int trapcmd(int, char **) FAST_FUNC;
9205 static int umaskcmd(int, char **) FAST_FUNC;
9206 static int unsetcmd(int, char **) FAST_FUNC;
9207 static int ulimitcmd(int, char **) FAST_FUNC;
9209 #define BUILTIN_NOSPEC "0"
9210 #define BUILTIN_SPECIAL "1"
9211 #define BUILTIN_REGULAR "2"
9212 #define BUILTIN_SPEC_REG "3"
9213 #define BUILTIN_ASSIGN "4"
9214 #define BUILTIN_SPEC_ASSG "5"
9215 #define BUILTIN_REG_ASSG "6"
9216 #define BUILTIN_SPEC_REG_ASSG "7"
9218 /* Stubs for calling non-FAST_FUNC's */
9219 #if ENABLE_ASH_BUILTIN_ECHO
9220 static int FAST_FUNC echocmd(int argc, char **argv) { return echo_main(argc, argv); }
9222 #if ENABLE_ASH_BUILTIN_PRINTF
9223 static int FAST_FUNC printfcmd(int argc, char **argv) { return printf_main(argc, argv); }
9225 #if ENABLE_ASH_BUILTIN_TEST
9226 static int FAST_FUNC testcmd(int argc, char **argv) { return test_main(argc, argv); }
9229 /* Keep these in proper order since it is searched via bsearch() */
9230 static const struct builtincmd builtintab[] = {
9231 { BUILTIN_SPEC_REG "." , dotcmd },
9232 { BUILTIN_SPEC_REG ":" , truecmd },
9233 #if ENABLE_ASH_BUILTIN_TEST
9234 { BUILTIN_REGULAR "[" , testcmd },
9235 #if ENABLE_ASH_BASH_COMPAT
9236 { BUILTIN_REGULAR "[[" , testcmd },
9239 #if ENABLE_ASH_ALIAS
9240 { BUILTIN_REG_ASSG "alias" , aliascmd },
9243 { BUILTIN_REGULAR "bg" , fg_bgcmd },
9245 { BUILTIN_SPEC_REG "break" , breakcmd },
9246 { BUILTIN_REGULAR "cd" , cdcmd },
9247 { BUILTIN_NOSPEC "chdir" , cdcmd },
9248 #if ENABLE_ASH_CMDCMD
9249 { BUILTIN_REGULAR "command" , commandcmd },
9251 { BUILTIN_SPEC_REG "continue", breakcmd },
9252 #if ENABLE_ASH_BUILTIN_ECHO
9253 { BUILTIN_REGULAR "echo" , echocmd },
9255 { BUILTIN_SPEC_REG "eval" , NULL }, /*evalcmd() has a differing prototype*/
9256 { BUILTIN_SPEC_REG "exec" , execcmd },
9257 { BUILTIN_SPEC_REG "exit" , exitcmd },
9258 { BUILTIN_SPEC_REG_ASSG "export" , exportcmd },
9259 { BUILTIN_REGULAR "false" , falsecmd },
9261 { BUILTIN_REGULAR "fg" , fg_bgcmd },
9263 #if ENABLE_ASH_GETOPTS
9264 { BUILTIN_REGULAR "getopts" , getoptscmd },
9266 { BUILTIN_NOSPEC "hash" , hashcmd },
9268 { BUILTIN_NOSPEC "help" , helpcmd },
9271 { BUILTIN_NOSPEC "history" , historycmd },
9274 { BUILTIN_REGULAR "jobs" , jobscmd },
9275 { BUILTIN_REGULAR "kill" , killcmd },
9277 #if ENABLE_SH_MATH_SUPPORT
9278 { BUILTIN_NOSPEC "let" , letcmd },
9280 { BUILTIN_ASSIGN "local" , localcmd },
9281 #if ENABLE_ASH_BUILTIN_PRINTF
9282 { BUILTIN_REGULAR "printf" , printfcmd },
9284 { BUILTIN_NOSPEC "pwd" , pwdcmd },
9285 { BUILTIN_REGULAR "read" , readcmd },
9286 { BUILTIN_SPEC_REG_ASSG "readonly", exportcmd },
9287 { BUILTIN_SPEC_REG "return" , returncmd },
9288 { BUILTIN_SPEC_REG "set" , setcmd },
9289 { BUILTIN_SPEC_REG "shift" , shiftcmd },
9290 #if ENABLE_ASH_BASH_COMPAT
9291 { BUILTIN_SPEC_REG "source" , dotcmd },
9293 #if ENABLE_ASH_BUILTIN_TEST
9294 { BUILTIN_REGULAR "test" , testcmd },
9296 { BUILTIN_SPEC_REG "times" , timescmd },
9297 { BUILTIN_SPEC_REG "trap" , trapcmd },
9298 { BUILTIN_REGULAR "true" , truecmd },
9299 { BUILTIN_NOSPEC "type" , typecmd },
9300 { BUILTIN_NOSPEC "ulimit" , ulimitcmd },
9301 { BUILTIN_REGULAR "umask" , umaskcmd },
9302 #if ENABLE_ASH_ALIAS
9303 { BUILTIN_REGULAR "unalias" , unaliascmd },
9305 { BUILTIN_SPEC_REG "unset" , unsetcmd },
9306 { BUILTIN_REGULAR "wait" , waitcmd },
9309 /* Should match the above table! */
9310 #define COMMANDCMD (builtintab + \
9312 /* [ */ 1 * ENABLE_ASH_BUILTIN_TEST + \
9313 /* [[ */ 1 * ENABLE_ASH_BUILTIN_TEST * ENABLE_ASH_BASH_COMPAT + \
9314 /* alias */ 1 * ENABLE_ASH_ALIAS + \
9315 /* bg */ 1 * ENABLE_ASH_JOB_CONTROL + \
9316 /* break cd cddir */ 3)
9317 #define EVALCMD (COMMANDCMD + \
9318 /* command */ 1 * ENABLE_ASH_CMDCMD + \
9319 /* continue */ 1 + \
9320 /* echo */ 1 * ENABLE_ASH_BUILTIN_ECHO + \
9322 #define EXECCMD (EVALCMD + \
9326 * Search the table of builtin commands.
9329 pstrcmp1(const void *a, const void *b)
9331 return strcmp((char*)a, *(char**)b + 1);
9333 static struct builtincmd *
9334 find_builtin(const char *name)
9336 struct builtincmd *bp;
9339 name, builtintab, ARRAY_SIZE(builtintab), sizeof(builtintab[0]),
9346 * Execute a simple command.
9349 isassignment(const char *p)
9351 const char *q = endofname(p);
9356 static int FAST_FUNC
9357 bltincmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
9359 /* Preserve exitstatus of a previous possible redirection
9360 * as POSIX mandates */
9361 return back_exitstatus;
9364 evalcommand(union node *cmd, int flags)
9366 static const struct builtincmd null_bltin = {
9367 "\0\0", bltincmd /* why three NULs? */
9369 struct stackmark smark;
9371 struct arglist arglist;
9372 struct arglist varlist;
9375 const struct strlist *sp;
9376 struct cmdentry cmdentry;
9383 struct builtincmd *bcmd;
9384 smallint cmd_is_exec;
9385 smallint pseudovarflag = 0;
9387 /* First expand the arguments. */
9388 TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags));
9389 setstackmark(&smark);
9390 back_exitstatus = 0;
9392 cmdentry.cmdtype = CMDBUILTIN;
9393 cmdentry.u.cmd = &null_bltin;
9394 varlist.lastp = &varlist.list;
9395 *varlist.lastp = NULL;
9396 arglist.lastp = &arglist.list;
9397 *arglist.lastp = NULL;
9400 if (cmd->ncmd.args) {
9401 bcmd = find_builtin(cmd->ncmd.args->narg.text);
9402 pseudovarflag = bcmd && IS_BUILTIN_ASSIGN(bcmd);
9405 for (argp = cmd->ncmd.args; argp; argp = argp->narg.next) {
9406 struct strlist **spp;
9408 spp = arglist.lastp;
9409 if (pseudovarflag && isassignment(argp->narg.text))
9410 expandarg(argp, &arglist, EXP_VARTILDE);
9412 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
9414 for (sp = *spp; sp; sp = sp->next)
9418 argv = nargv = stalloc(sizeof(char *) * (argc + 1));
9419 for (sp = arglist.list; sp; sp = sp->next) {
9420 TRACE(("evalcommand arg: %s\n", sp->text));
9421 *nargv++ = sp->text;
9426 if (iflag && funcnest == 0 && argc > 0)
9427 lastarg = nargv[-1];
9430 expredir(cmd->ncmd.redirect);
9431 status = redirectsafe(cmd->ncmd.redirect, REDIR_PUSH | REDIR_SAVEFD2);
9433 path = vpath.var_text;
9434 for (argp = cmd->ncmd.assign; argp; argp = argp->narg.next) {
9435 struct strlist **spp;
9438 spp = varlist.lastp;
9439 expandarg(argp, &varlist, EXP_VARTILDE);
9442 * Modify the command lookup path, if a PATH= assignment
9446 if (varcmp(p, path) == 0)
9450 /* Print the command if xflag is set. */
9453 const char *p = " %s" + 1;
9455 fdprintf(preverrout_fd, p, expandstr(ps4val()));
9457 for (n = 0; n < 2; n++) {
9459 fdprintf(preverrout_fd, p, sp->text);
9465 safe_write(preverrout_fd, "\n", 1);
9471 /* Now locate the command. */
9473 int cmd_flag = DO_ERR;
9474 #if ENABLE_ASH_CMDCMD
9475 const char *oldpath = path + 5;
9479 find_command(argv[0], &cmdentry, cmd_flag, path);
9480 if (cmdentry.cmdtype == CMDUNKNOWN) {
9481 flush_stdout_stderr();
9486 /* implement bltin and command here */
9487 if (cmdentry.cmdtype != CMDBUILTIN)
9490 spclbltin = IS_BUILTIN_SPECIAL(cmdentry.u.cmd);
9491 if (cmdentry.u.cmd == EXECCMD)
9493 #if ENABLE_ASH_CMDCMD
9494 if (cmdentry.u.cmd == COMMANDCMD) {
9496 nargv = parse_command_args(argv, &path);
9499 /* It's "command [-p] PROG ARGS" (that is, no -Vv).
9500 * nargv => "PROG". path is updated if -p.
9502 argc -= nargv - argv;
9504 cmd_flag |= DO_NOFUNC;
9512 /* We have a redirection error. */
9514 raise_exception(EXERROR);
9516 exitstatus = status;
9520 /* Execute the command. */
9521 switch (cmdentry.cmdtype) {
9524 #if ENABLE_FEATURE_SH_NOFORK
9525 /* (1) BUG: if variables are set, we need to fork, or save/restore them
9526 * around run_nofork_applet() call.
9527 * (2) Should this check also be done in forkshell()?
9528 * (perhaps it should, so that "VAR=VAL nofork" at least avoids exec...)
9530 /* find_command() encodes applet_no as (-2 - applet_no) */
9531 int applet_no = (- cmdentry.u.index - 2);
9532 if (applet_no >= 0 && APPLET_IS_NOFORK(applet_no)) {
9533 listsetvar(varlist.list, VEXPORT|VSTACK);
9534 /* run <applet>_main() */
9535 status = run_nofork_applet(applet_no, argv);
9539 /* Can we avoid forking off? For example, very last command
9540 * in a script or a subshell does not need forking,
9541 * we can just exec it.
9543 if (!(flags & EV_EXIT) || may_have_traps) {
9544 /* No, forking off a child is necessary */
9546 jp = makejob(/*cmd,*/ 1);
9547 if (forkshell(jp, cmd, FORK_FG) != 0) {
9549 status = waitforjob(jp);
9551 TRACE(("forked child exited with %d\n", status));
9556 /* fall through to exec'ing external program */
9558 listsetvar(varlist.list, VEXPORT|VSTACK);
9559 shellexec(argv, path, cmdentry.u.index);
9563 cmdenviron = varlist.list;
9565 struct strlist *list = cmdenviron;
9567 if (spclbltin > 0 || argc == 0) {
9569 if (cmd_is_exec && argc > 1)
9572 listsetvar(list, i);
9574 /* Tight loop with builtins only:
9575 * "while kill -0 $child; do true; done"
9576 * will never exit even if $child died, unless we do this
9577 * to reap the zombie and make kill detect that it's gone: */
9578 dowait(DOWAIT_NONBLOCK, NULL);
9580 if (evalbltin(cmdentry.u.cmd, argc, argv, flags)) {
9582 int i = exception_type;
9587 exit_status = 128 + SIGINT;
9589 exit_status = 128 + pending_sig;
9590 exitstatus = exit_status;
9591 if (i == EXINT || spclbltin > 0) {
9593 longjmp(exception_handler->loc, 1);
9600 listsetvar(varlist.list, 0);
9601 /* See above for the rationale */
9602 dowait(DOWAIT_NONBLOCK, NULL);
9603 if (evalfun(cmdentry.u.func, argc, argv, flags))
9606 status = exitstatus;
9611 if (cmd->ncmd.redirect)
9612 popredir(/*drop:*/ cmd_is_exec, /*restore:*/ cmd_is_exec);
9614 /* dsl: I think this is intended to be used to support
9615 * '_' in 'vi' command mode during line editing...
9616 * However I implemented that within libedit itself.
9618 setvar0("_", lastarg);
9620 popstackmark(&smark);
9626 evalbltin(const struct builtincmd *cmd, int argc, char **argv, int flags)
9628 char *volatile savecmdname;
9629 struct jmploc *volatile savehandler;
9630 struct jmploc jmploc;
9634 savecmdname = commandname;
9635 savehandler = exception_handler;
9636 i = setjmp(jmploc.loc);
9639 exception_handler = &jmploc;
9640 commandname = argv[0];
9642 optptr = NULL; /* initialize nextopt */
9644 status = evalcmd(argc, argv, flags);
9646 status = (*cmd->builtin)(argc, argv);
9647 flush_stdout_stderr();
9648 status |= ferror(stdout);
9649 exitstatus = status;
9652 commandname = savecmdname;
9653 exception_handler = savehandler;
9659 goodname(const char *p)
9661 return endofname(p)[0] == '\0';
9666 * Search for a command. This is called before we fork so that the
9667 * location of the command will be available in the parent as well as
9668 * the child. The check for "goodname" is an overly conservative
9669 * check that the name will not be subject to expansion.
9672 prehash(union node *n)
9674 struct cmdentry entry;
9676 if (n->type == NCMD && n->ncmd.args && goodname(n->ncmd.args->narg.text))
9677 find_command(n->ncmd.args->narg.text, &entry, 0, pathval());
9681 /* ============ Builtin commands
9683 * Builtin commands whose functions are closely tied to evaluation
9684 * are implemented here.
9688 * Handle break and continue commands. Break, continue, and return are
9689 * all handled by setting the evalskip flag. The evaluation routines
9690 * above all check this flag, and if it is set they start skipping
9691 * commands rather than executing them. The variable skipcount is
9692 * the number of loops to break/continue, or the number of function
9693 * levels to return. (The latter is always 1.) It should probably
9694 * be an error to break out of more loops than exist, but it isn't
9695 * in the standard shell so we don't make it one here.
9697 static int FAST_FUNC
9698 breakcmd(int argc UNUSED_PARAM, char **argv)
9700 int n = argv[1] ? number(argv[1]) : 1;
9703 ash_msg_and_raise_error(msg_illnum, argv[1]);
9707 evalskip = (**argv == 'c') ? SKIPCONT : SKIPBREAK;
9714 /* ============ input.c
9716 * This implements the input routines used by the parser.
9720 INPUT_PUSH_FILE = 1,
9721 INPUT_NOFILE_OK = 2,
9724 static smallint checkkwd;
9725 /* values of checkkwd variable */
9726 #define CHKALIAS 0x1
9731 * Push a string back onto the input at this current parsefile level.
9732 * We handle aliases this way.
9734 #if !ENABLE_ASH_ALIAS
9735 #define pushstring(s, ap) pushstring(s)
9738 pushstring(char *s, struct alias *ap)
9745 if (g_parsefile->strpush) {
9746 sp = ckzalloc(sizeof(*sp));
9747 sp->prev = g_parsefile->strpush;
9749 sp = &(g_parsefile->basestrpush);
9751 g_parsefile->strpush = sp;
9752 sp->prev_string = g_parsefile->next_to_pgetc;
9753 sp->prev_left_in_line = g_parsefile->left_in_line;
9754 sp->unget = g_parsefile->unget;
9755 memcpy(sp->lastc, g_parsefile->lastc, sizeof(sp->lastc));
9756 #if ENABLE_ASH_ALIAS
9759 ap->flag |= ALIASINUSE;
9763 g_parsefile->next_to_pgetc = s;
9764 g_parsefile->left_in_line = len;
9765 g_parsefile->unget = 0;
9772 struct strpush *sp = g_parsefile->strpush;
9775 #if ENABLE_ASH_ALIAS
9777 if (g_parsefile->next_to_pgetc[-1] == ' '
9778 || g_parsefile->next_to_pgetc[-1] == '\t'
9780 checkkwd |= CHKALIAS;
9782 if (sp->string != sp->ap->val) {
9785 sp->ap->flag &= ~ALIASINUSE;
9786 if (sp->ap->flag & ALIASDEAD) {
9787 unalias(sp->ap->name);
9791 g_parsefile->next_to_pgetc = sp->prev_string;
9792 g_parsefile->left_in_line = sp->prev_left_in_line;
9793 g_parsefile->unget = sp->unget;
9794 memcpy(g_parsefile->lastc, sp->lastc, sizeof(sp->lastc));
9795 g_parsefile->strpush = sp->prev;
9796 if (sp != &(g_parsefile->basestrpush))
9805 char *buf = g_parsefile->buf;
9807 g_parsefile->next_to_pgetc = buf;
9808 #if ENABLE_FEATURE_EDITING
9810 if (!iflag || g_parsefile->pf_fd != STDIN_FILENO)
9811 nr = nonblock_immune_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1);
9814 # if ENABLE_ASH_IDLE_TIMEOUT
9816 const char *tmout_var = lookupvar("TMOUT");
9818 timeout = atoi(tmout_var) * 1000;
9824 # if ENABLE_FEATURE_TAB_COMPLETION
9825 line_input_state->path_lookup = pathval();
9827 reinit_unicode_for_ash();
9828 nr = read_line_input(line_input_state, cmdedit_prompt, buf, IBUFSIZ, timeout);
9830 /* Ctrl+C pressed */
9841 /* Ctrl+D pressed */
9844 # if ENABLE_ASH_IDLE_TIMEOUT
9845 else if (errno == EAGAIN && timeout > 0) {
9846 puts("\007timed out waiting for input: auto-logout");
9853 nr = nonblock_immune_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1);
9856 #if 0 /* disabled: nonblock_immune_read() handles this problem */
9858 if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
9859 int flags = fcntl(0, F_GETFL);
9860 if (flags >= 0 && (flags & O_NONBLOCK)) {
9861 flags &= ~O_NONBLOCK;
9862 if (fcntl(0, F_SETFL, flags) >= 0) {
9863 out2str("sh: turning off NDELAY mode\n");
9874 * Refill the input buffer and return the next input character:
9876 * 1) If a string was pushed back on the input, pop it;
9877 * 2) If an EOF was pushed back (g_parsefile->left_in_line < -BIGNUM)
9878 * or we are reading from a string so we can't refill the buffer,
9880 * 3) If there is more stuff in this buffer, use it else call read to fill it.
9881 * 4) Process input up to the next newline, deleting nul characters.
9883 //#define pgetc_debug(...) bb_error_msg(__VA_ARGS__)
9884 #define pgetc_debug(...) ((void)0)
9885 static int pgetc(void);
9892 if (g_parsefile->strpush) {
9893 #if ENABLE_ASH_ALIAS
9894 if (g_parsefile->left_in_line == -1
9895 && g_parsefile->strpush->ap
9896 && g_parsefile->next_to_pgetc[-1] != ' '
9897 && g_parsefile->next_to_pgetc[-1] != '\t'
9899 pgetc_debug("preadbuffer PEOA");
9906 /* on both branches above g_parsefile->left_in_line < 0.
9907 * "pgetc" needs refilling.
9910 /* -90 is our -BIGNUM. Below we use -99 to mark "EOF on read",
9911 * pungetc() may increment it a few times.
9912 * Assuming it won't increment it to less than -90.
9914 if (g_parsefile->left_in_line < -90 || g_parsefile->buf == NULL) {
9915 pgetc_debug("preadbuffer PEOF1");
9916 /* even in failure keep left_in_line and next_to_pgetc
9917 * in lock step, for correct multi-layer pungetc.
9918 * left_in_line was decremented before preadbuffer(),
9919 * must inc next_to_pgetc: */
9920 g_parsefile->next_to_pgetc++;
9924 more = g_parsefile->left_in_buffer;
9926 flush_stdout_stderr();
9930 /* don't try reading again */
9931 g_parsefile->left_in_line = -99;
9932 pgetc_debug("preadbuffer PEOF2");
9933 g_parsefile->next_to_pgetc++;
9938 /* Find out where's the end of line.
9939 * Set g_parsefile->left_in_line
9940 * and g_parsefile->left_in_buffer acordingly.
9941 * NUL chars are deleted.
9943 q = g_parsefile->next_to_pgetc;
9951 memmove(q, q + 1, more);
9955 g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1;
9961 g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1;
9962 if (g_parsefile->left_in_line < 0)
9967 g_parsefile->left_in_buffer = more;
9972 out2str(g_parsefile->next_to_pgetc);
9976 pgetc_debug("preadbuffer at %d:%p'%s'",
9977 g_parsefile->left_in_line,
9978 g_parsefile->next_to_pgetc,
9979 g_parsefile->next_to_pgetc);
9980 return (unsigned char)*g_parsefile->next_to_pgetc++;
9986 g_parsefile->linno++;
9987 setprompt_if(doprompt, 2);
9992 g_parsefile->linno++;
9993 needprompt = doprompt;
10001 pgetc_debug("pgetc at %d:%p'%s'",
10002 g_parsefile->left_in_line,
10003 g_parsefile->next_to_pgetc,
10004 g_parsefile->next_to_pgetc);
10005 if (g_parsefile->unget)
10006 return g_parsefile->lastc[--g_parsefile->unget];
10008 if (--g_parsefile->left_in_line >= 0)
10009 c = (signed char)*g_parsefile->next_to_pgetc++;
10013 g_parsefile->lastc[1] = g_parsefile->lastc[0];
10014 g_parsefile->lastc[0] = c;
10019 #if ENABLE_ASH_ALIAS
10021 pgetc_without_PEOA(void)
10025 pgetc_debug("pgetc at %d:%p'%s'",
10026 g_parsefile->left_in_line,
10027 g_parsefile->next_to_pgetc,
10028 g_parsefile->next_to_pgetc);
10030 } while (c == PEOA);
10034 # define pgetc_without_PEOA() pgetc()
10038 * Read a line from the script.
10041 pfgets(char *line, int len)
10047 while (--nleft > 0) {
10048 c = pgetc_without_PEOA();
10063 * Undo a call to pgetc. Only two characters may be pushed back.
10064 * PEOF may be pushed back.
10069 g_parsefile->unget++;
10072 /* This one eats backslash+newline */
10078 while ((c = pgetc()) == '\\') {
10079 if (pgetc() != '\n') {
10091 * To handle the "." command, a stack of input files is used. Pushfile
10092 * adds a new entry to the stack and popfile restores the previous level.
10097 struct parsefile *pf;
10099 pf = ckzalloc(sizeof(*pf));
10100 pf->prev = g_parsefile;
10102 /*pf->strpush = NULL; - ckzalloc did it */
10103 /*pf->basestrpush.prev = NULL;*/
10111 struct parsefile *pf = g_parsefile;
10114 if (pf->pf_fd >= 0)
10117 while (pf->strpush)
10119 g_parsefile = pf->prev;
10125 * Return to top level.
10130 while (g_parsefile != &basepf)
10135 * Close the file(s) that the shell is reading commands from. Called
10136 * after a fork is done.
10142 if (g_parsefile->pf_fd > 0) {
10143 close(g_parsefile->pf_fd);
10144 g_parsefile->pf_fd = 0;
10149 * Like setinputfile, but takes an open file descriptor. Call this with
10153 setinputfd(int fd, int push)
10157 g_parsefile->buf = NULL;
10159 g_parsefile->pf_fd = fd;
10160 if (g_parsefile->buf == NULL)
10161 g_parsefile->buf = ckmalloc(IBUFSIZ);
10162 g_parsefile->left_in_buffer = 0;
10163 g_parsefile->left_in_line = 0;
10164 g_parsefile->linno = 1;
10168 * Set the input to take input from a file. If push is set, push the
10169 * old input onto the stack first.
10172 setinputfile(const char *fname, int flags)
10177 fd = open(fname, O_RDONLY);
10179 if (flags & INPUT_NOFILE_OK)
10182 ash_msg_and_raise_error("can't open '%s'", fname);
10187 close_on_exec_on(fd);
10188 setinputfd(fd, flags & INPUT_PUSH_FILE);
10195 * Like setinputfile, but takes input from a string.
10198 setinputstring(char *string)
10202 g_parsefile->next_to_pgetc = string;
10203 g_parsefile->left_in_line = strlen(string);
10204 g_parsefile->buf = NULL;
10205 g_parsefile->linno = 1;
10210 /* ============ mail.c
10212 * Routines to check for mail.
10215 #if ENABLE_ASH_MAIL
10217 /* Hash of mtimes of mailboxes */
10218 static unsigned mailtime_hash;
10219 /* Set if MAIL or MAILPATH is changed. */
10220 static smallint mail_var_path_changed;
10223 * Print appropriate message(s) if mail has arrived.
10224 * If mail_var_path_changed is set,
10225 * then the value of MAIL has mail_var_path_changed,
10226 * so we just update the values.
10235 struct stackmark smark;
10238 setstackmark(&smark);
10239 mpath = mpathset() ? mpathval() : mailval();
10242 p = path_advance(&mpath, nullstr);
10247 for (q = p; *q; q++)
10253 q[-1] = '\0'; /* delete trailing '/' */
10254 if (stat(p, &statb) < 0) {
10257 /* Very simplistic "hash": just a sum of all mtimes */
10258 new_hash += (unsigned)statb.st_mtime;
10260 if (!mail_var_path_changed && mailtime_hash != new_hash) {
10261 if (mailtime_hash != 0)
10262 out2str("you have mail\n");
10263 mailtime_hash = new_hash;
10265 mail_var_path_changed = 0;
10266 popstackmark(&smark);
10269 static void FAST_FUNC
10270 changemail(const char *val UNUSED_PARAM)
10272 mail_var_path_changed = 1;
10275 #endif /* ASH_MAIL */
10278 /* ============ ??? */
10281 * Set the shell parameters.
10284 setparam(char **argv)
10290 for (nparam = 0; argv[nparam]; nparam++)
10292 ap = newparam = ckmalloc((nparam + 1) * sizeof(*ap));
10294 *ap++ = ckstrdup(*argv++);
10297 freeparam(&shellparam);
10298 shellparam.malloced = 1;
10299 shellparam.nparam = nparam;
10300 shellparam.p = newparam;
10301 #if ENABLE_ASH_GETOPTS
10302 shellparam.optind = 1;
10303 shellparam.optoff = -1;
10308 * Process shell options. The global variable argptr contains a pointer
10309 * to the argument list; we advance it past the options.
10311 * SUSv3 section 2.8.1 "Consequences of Shell Errors" says:
10312 * For a non-interactive shell, an error condition encountered
10313 * by a special built-in ... shall cause the shell to write a diagnostic message
10314 * to standard error and exit as shown in the following table:
10315 * Error Special Built-In
10317 * Utility syntax error (option or operand error) Shall exit
10319 * However, in bug 1142 (http://busybox.net/bugs/view.php?id=1142)
10320 * we see that bash does not do that (set "finishes" with error code 1 instead,
10321 * and shell continues), and people rely on this behavior!
10323 * set -o barfoo 2>/dev/null
10326 * Oh well. Let's mimic that.
10329 plus_minus_o(char *name, int val)
10334 for (i = 0; i < NOPTS; i++) {
10335 if (strcmp(name, optnames(i)) == 0) {
10340 ash_msg("illegal option %co %s", val ? '-' : '+', name);
10343 for (i = 0; i < NOPTS; i++) {
10345 out1fmt("%-16s%s\n", optnames(i), optlist[i] ? "on" : "off");
10347 out1fmt("set %co %s\n", optlist[i] ? '-' : '+', optnames(i));
10353 setoption(int flag, int val)
10357 for (i = 0; i < NOPTS; i++) {
10358 if (optletters(i) == flag) {
10363 ash_msg_and_raise_error("illegal option %c%c", val ? '-' : '+', flag);
10367 options(int cmdline)
10375 while ((p = *argptr) != NULL) {
10377 if (c != '-' && c != '+')
10380 val = 0; /* val = 0 if c == '+' */
10383 if (p[0] == '\0' || LONE_DASH(p)) {
10385 /* "-" means turn off -x and -v */
10388 /* "--" means reset params */
10389 else if (*argptr == NULL)
10392 break; /* "-" or "--" terminates options */
10395 /* first char was + or - */
10396 while ((c = *p++) != '\0') {
10397 /* bash 3.2 indeed handles -c CMD and +c CMD the same */
10398 if (c == 'c' && cmdline) {
10399 minusc = p; /* command is after shell args */
10400 } else if (c == 'o') {
10401 if (plus_minus_o(*argptr, val)) {
10402 /* it already printed err message */
10403 return 1; /* error */
10407 } else if (cmdline && (c == 'l')) { /* -l or +l == --login */
10409 /* bash does not accept +-login, we also won't */
10410 } else if (cmdline && val && (c == '-')) { /* long options */
10411 if (strcmp(p, "login") == 0)
10423 * The shift builtin command.
10425 static int FAST_FUNC
10426 shiftcmd(int argc UNUSED_PARAM, char **argv)
10433 n = number(argv[1]);
10434 if (n > shellparam.nparam)
10435 n = 0; /* bash compat, was = shellparam.nparam; */
10437 shellparam.nparam -= n;
10438 for (ap1 = shellparam.p; --n >= 0; ap1++) {
10439 if (shellparam.malloced)
10442 ap2 = shellparam.p;
10443 while ((*ap2++ = *ap1++) != NULL)
10445 #if ENABLE_ASH_GETOPTS
10446 shellparam.optind = 1;
10447 shellparam.optoff = -1;
10454 * POSIX requires that 'set' (but not export or readonly) output the
10455 * variables in lexicographic order - by the locale's collating order (sigh).
10456 * Maybe we could keep them in an ordered balanced binary tree
10457 * instead of hashed lists.
10458 * For now just roll 'em through qsort for printing...
10461 showvars(const char *sep_prefix, int on, int off)
10464 char **ep, **epend;
10466 ep = listvars(on, off, &epend);
10467 qsort(ep, epend - ep, sizeof(char *), vpcmp);
10469 sep = *sep_prefix ? " " : sep_prefix;
10471 for (; ep < epend; ep++) {
10475 p = strchrnul(*ep, '=');
10478 q = single_quote(++p);
10479 out1fmt("%s%s%.*s%s\n", sep_prefix, sep, (int)(p - *ep), *ep, q);
10485 * The set command builtin.
10487 static int FAST_FUNC
10488 setcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
10493 return showvars(nullstr, 0, VUNSET);
10496 retval = options(/*cmdline:*/ 0);
10497 if (retval == 0) { /* if no parse error... */
10499 if (*argptr != NULL) {
10507 #if ENABLE_ASH_RANDOM_SUPPORT
10508 static void FAST_FUNC
10509 change_random(const char *value)
10513 if (value == NULL) {
10514 /* "get", generate */
10515 t = next_random(&random_gen);
10516 /* set without recursion */
10517 setvar(vrandom.var_text, utoa(t), VNOFUNC);
10518 vrandom.flags &= ~VNOFUNC;
10521 t = strtoul(value, NULL, 10);
10522 INIT_RANDOM_T(&random_gen, (t ? t : 1), t);
10527 #if ENABLE_ASH_GETOPTS
10529 getopts(char *optstr, char *optvar, char **optfirst)
10536 int ind = shellparam.optind;
10537 int off = shellparam.optoff;
10541 shellparam.optind = -1;
10542 optnext = optfirst + ind - 1;
10544 if (ind <= 1 || off < 0 || (int)strlen(optnext[-1]) < off)
10547 p = optnext[-1] + off;
10548 if (p == NULL || *p == '\0') {
10549 /* Current word is done, advance */
10551 if (p == NULL || *p != '-' || *++p == '\0') {
10558 if (LONE_DASH(p)) /* check for "--" */
10563 for (q = optstr; *q != c;) {
10565 if (optstr[0] == ':') {
10567 /*sbuf[1] = '\0'; - already is */
10568 setvar0("OPTARG", sbuf);
10570 fprintf(stderr, "Illegal option -%c\n", c);
10571 unsetvar("OPTARG");
10581 if (*p == '\0' && (p = *optnext) == NULL) {
10582 if (optstr[0] == ':') {
10584 /*sbuf[1] = '\0'; - already is */
10585 setvar0("OPTARG", sbuf);
10588 fprintf(stderr, "No arg for -%c option\n", c);
10589 unsetvar("OPTARG");
10597 setvar0("OPTARG", p);
10600 setvar0("OPTARG", nullstr);
10602 ind = optnext - optfirst + 1;
10603 setvar("OPTIND", itoa(ind), VNOFUNC);
10605 /*sbuf[1] = '\0'; - already is */
10606 setvar0(optvar, sbuf);
10608 shellparam.optoff = p ? p - *(optnext - 1) : -1;
10609 shellparam.optind = ind;
10615 * The getopts builtin. Shellparam.optnext points to the next argument
10616 * to be processed. Shellparam.optptr points to the next character to
10617 * be processed in the current argument. If shellparam.optnext is NULL,
10618 * then it's the first time getopts has been called.
10620 static int FAST_FUNC
10621 getoptscmd(int argc, char **argv)
10626 ash_msg_and_raise_error("usage: getopts optstring var [arg]");
10628 optbase = shellparam.p;
10629 if ((unsigned)shellparam.optind > shellparam.nparam + 1) {
10630 shellparam.optind = 1;
10631 shellparam.optoff = -1;
10634 optbase = &argv[3];
10635 if ((unsigned)shellparam.optind > argc - 2) {
10636 shellparam.optind = 1;
10637 shellparam.optoff = -1;
10641 return getopts(argv[1], argv[2], optbase);
10643 #endif /* ASH_GETOPTS */
10646 /* ============ Shell parser */
10649 struct heredoc *next; /* next here document in list */
10650 union node *here; /* redirection node */
10651 char *eofmark; /* string indicating end of input */
10652 smallint striptabs; /* if set, strip leading tabs */
10655 static smallint tokpushback; /* last token pushed back */
10656 static smallint quoteflag; /* set if (part of) last token was quoted */
10657 static token_id_t lasttoken; /* last token read (integer id Txxx) */
10658 static struct heredoc *heredoclist; /* list of here documents to read */
10659 static char *wordtext; /* text of last word returned by readtoken */
10660 static struct nodelist *backquotelist;
10661 static union node *redirnode;
10662 static struct heredoc *heredoc;
10664 static const char *
10665 tokname(char *buf, int tok)
10668 return tokname_array[tok];
10669 sprintf(buf, "\"%s\"", tokname_array[tok]);
10673 /* raise_error_unexpected_syntax:
10674 * Called when an unexpected token is read during the parse. The argument
10675 * is the token that is expected, or -1 if more than one type of token can
10676 * occur at this point.
10678 static void raise_error_unexpected_syntax(int) NORETURN;
10680 raise_error_unexpected_syntax(int token)
10686 l = sprintf(msg, "unexpected %s", tokname(buf, lasttoken));
10688 sprintf(msg + l, " (expecting %s)", tokname(buf, token));
10689 raise_error_syntax(msg);
10693 #define EOFMARKLEN 79
10695 /* parsing is heavily cross-recursive, need these forward decls */
10696 static union node *andor(void);
10697 static union node *pipeline(void);
10698 static union node *parse_command(void);
10699 static void parseheredoc(void);
10700 static int peektoken(void);
10701 static int readtoken(void);
10703 static union node *
10706 union node *n1, *n2, *n3;
10711 switch (peektoken()) {
10719 if (!n1 && (nlflag & 1))
10725 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10726 if (nlflag == 2 && ((1 << peektoken()) & tokendlist))
10732 if (tok == TBACKGND) {
10733 if (n2->type == NPIPE) {
10734 n2->npipe.pipe_backgnd = 1;
10736 if (n2->type != NREDIR) {
10737 n3 = stzalloc(sizeof(struct nredir));
10739 /*n3->nredir.redirect = NULL; - stzalloc did it */
10742 n2->type = NBACKGND;
10748 n3 = stzalloc(sizeof(struct nbinary));
10750 n3->nbinary.ch1 = n1;
10751 n3->nbinary.ch2 = n2;
10764 raise_error_unexpected_syntax(-1);
10771 static union node *
10774 union node *n1, *n2, *n3;
10782 } else if (t == TOR) {
10788 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10790 n3 = stzalloc(sizeof(struct nbinary));
10792 n3->nbinary.ch1 = n1;
10793 n3->nbinary.ch2 = n2;
10798 static union node *
10801 union node *n1, *n2, *pipenode;
10802 struct nodelist *lp, *prev;
10806 TRACE(("pipeline: entered\n"));
10807 if (readtoken() == TNOT) {
10809 checkkwd = CHKKWD | CHKALIAS;
10812 n1 = parse_command();
10813 if (readtoken() == TPIPE) {
10814 pipenode = stzalloc(sizeof(struct npipe));
10815 pipenode->type = NPIPE;
10816 /*pipenode->npipe.pipe_backgnd = 0; - stzalloc did it */
10817 lp = stzalloc(sizeof(struct nodelist));
10818 pipenode->npipe.cmdlist = lp;
10822 lp = stzalloc(sizeof(struct nodelist));
10823 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10824 lp->n = parse_command();
10826 } while (readtoken() == TPIPE);
10832 n2 = stzalloc(sizeof(struct nnot));
10840 static union node *
10845 n = stzalloc(sizeof(struct narg));
10847 /*n->narg.next = NULL; - stzalloc did it */
10848 n->narg.text = wordtext;
10849 n->narg.backquote = backquotelist;
10854 fixredir(union node *n, const char *text, int err)
10858 TRACE(("Fix redir %s %d\n", text, err));
10860 n->ndup.vname = NULL;
10862 fd = bb_strtou(text, NULL, 10);
10863 if (!errno && fd >= 0)
10864 n->ndup.dupfd = fd;
10865 else if (LONE_DASH(text))
10866 n->ndup.dupfd = -1;
10869 raise_error_syntax("bad fd number");
10870 n->ndup.vname = makename();
10875 * Returns true if the text contains nothing to expand (no dollar signs
10879 noexpand(const char *text)
10883 while ((c = *text++) != '\0') {
10884 if (c == CTLQUOTEMARK)
10888 else if (SIT(c, BASESYNTAX) == CCTL)
10897 union node *n = redirnode;
10899 if (readtoken() != TWORD)
10900 raise_error_unexpected_syntax(-1);
10901 if (n->type == NHERE) {
10902 struct heredoc *here = heredoc;
10906 if (quoteflag == 0)
10908 TRACE(("Here document %d\n", n->type));
10909 if (!noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN)
10910 raise_error_syntax("illegal eof marker for << redirection");
10911 rmescapes(wordtext, 0);
10912 here->eofmark = wordtext;
10914 if (heredoclist == NULL)
10915 heredoclist = here;
10917 for (p = heredoclist; p->next; p = p->next)
10921 } else if (n->type == NTOFD || n->type == NFROMFD) {
10922 fixredir(n, wordtext, 0);
10924 n->nfile.fname = makename();
10928 static union node *
10931 union node *args, **app;
10932 union node *n = NULL;
10933 union node *vars, **vpp;
10934 union node **rpp, *redir;
10936 #if ENABLE_ASH_BASH_COMPAT
10937 smallint double_brackets_flag = 0;
10938 smallint function_flag = 0;
10948 savecheckkwd = CHKALIAS;
10951 checkkwd = savecheckkwd;
10954 #if ENABLE_ASH_BASH_COMPAT
10956 if (peektoken() != TWORD)
10957 raise_error_unexpected_syntax(TWORD);
10960 case TAND: /* "&&" */
10961 case TOR: /* "||" */
10962 if (!double_brackets_flag) {
10966 wordtext = (char *) (t == TAND ? "-a" : "-o");
10969 n = stzalloc(sizeof(struct narg));
10971 /*n->narg.next = NULL; - stzalloc did it */
10972 n->narg.text = wordtext;
10973 #if ENABLE_ASH_BASH_COMPAT
10974 if (strcmp("[[", wordtext) == 0)
10975 double_brackets_flag = 1;
10976 else if (strcmp("]]", wordtext) == 0)
10977 double_brackets_flag = 0;
10979 n->narg.backquote = backquotelist;
10980 if (savecheckkwd && isassignment(wordtext)) {
10982 vpp = &n->narg.next;
10985 app = &n->narg.next;
10988 #if ENABLE_ASH_BASH_COMPAT
10989 if (function_flag) {
10990 checkkwd = CHKNL | CHKKWD;
10991 switch (peektoken()) {
11003 if (strcmp("[[", wordtext) == 0)
11007 raise_error_unexpected_syntax(-1);
11013 *rpp = n = redirnode;
11014 rpp = &n->nfile.next;
11015 parsefname(); /* read name of redirection file */
11018 IF_ASH_BASH_COMPAT(do_func:)
11019 if (args && app == &args->narg.next
11022 struct builtincmd *bcmd;
11025 /* We have a function */
11026 if (IF_ASH_BASH_COMPAT(!function_flag &&) readtoken() != TRP)
11027 raise_error_unexpected_syntax(TRP);
11028 name = n->narg.text;
11029 if (!goodname(name)
11030 || ((bcmd = find_builtin(name)) && IS_BUILTIN_SPECIAL(bcmd))
11032 raise_error_syntax("bad function name");
11035 checkkwd = CHKNL | CHKKWD | CHKALIAS;
11036 n->narg.next = parse_command();
11039 IF_ASH_BASH_COMPAT(function_flag = 0;)
11050 n = stzalloc(sizeof(struct ncmd));
11052 n->ncmd.args = args;
11053 n->ncmd.assign = vars;
11054 n->ncmd.redirect = redir;
11058 static union node *
11059 parse_command(void)
11061 union node *n1, *n2;
11062 union node *ap, **app;
11063 union node *cp, **cpp;
11064 union node *redir, **rpp;
11071 switch (readtoken()) {
11073 raise_error_unexpected_syntax(-1);
11076 n1 = stzalloc(sizeof(struct nif));
11078 n1->nif.test = list(0);
11079 if (readtoken() != TTHEN)
11080 raise_error_unexpected_syntax(TTHEN);
11081 n1->nif.ifpart = list(0);
11083 while (readtoken() == TELIF) {
11084 n2->nif.elsepart = stzalloc(sizeof(struct nif));
11085 n2 = n2->nif.elsepart;
11087 n2->nif.test = list(0);
11088 if (readtoken() != TTHEN)
11089 raise_error_unexpected_syntax(TTHEN);
11090 n2->nif.ifpart = list(0);
11092 if (lasttoken == TELSE)
11093 n2->nif.elsepart = list(0);
11095 n2->nif.elsepart = NULL;
11103 n1 = stzalloc(sizeof(struct nbinary));
11104 n1->type = (lasttoken == TWHILE) ? NWHILE : NUNTIL;
11105 n1->nbinary.ch1 = list(0);
11108 TRACE(("expecting DO got '%s' %s\n", tokname_array[got],
11109 got == TWORD ? wordtext : ""));
11110 raise_error_unexpected_syntax(TDO);
11112 n1->nbinary.ch2 = list(0);
11117 if (readtoken() != TWORD || quoteflag || !goodname(wordtext))
11118 raise_error_syntax("bad for loop variable");
11119 n1 = stzalloc(sizeof(struct nfor));
11121 n1->nfor.var = wordtext;
11122 checkkwd = CHKNL | CHKKWD | CHKALIAS;
11123 if (readtoken() == TIN) {
11125 while (readtoken() == TWORD) {
11126 n2 = stzalloc(sizeof(struct narg));
11128 /*n2->narg.next = NULL; - stzalloc did it */
11129 n2->narg.text = wordtext;
11130 n2->narg.backquote = backquotelist;
11132 app = &n2->narg.next;
11135 n1->nfor.args = ap;
11136 if (lasttoken != TNL && lasttoken != TSEMI)
11137 raise_error_unexpected_syntax(-1);
11139 n2 = stzalloc(sizeof(struct narg));
11141 /*n2->narg.next = NULL; - stzalloc did it */
11142 n2->narg.text = (char *)dolatstr;
11143 /*n2->narg.backquote = NULL;*/
11144 n1->nfor.args = n2;
11146 * Newline or semicolon here is optional (but note
11147 * that the original Bourne shell only allowed NL).
11149 if (lasttoken != TSEMI)
11152 checkkwd = CHKNL | CHKKWD | CHKALIAS;
11153 if (readtoken() != TDO)
11154 raise_error_unexpected_syntax(TDO);
11155 n1->nfor.body = list(0);
11159 n1 = stzalloc(sizeof(struct ncase));
11161 if (readtoken() != TWORD)
11162 raise_error_unexpected_syntax(TWORD);
11163 n1->ncase.expr = n2 = stzalloc(sizeof(struct narg));
11165 /*n2->narg.next = NULL; - stzalloc did it */
11166 n2->narg.text = wordtext;
11167 n2->narg.backquote = backquotelist;
11168 checkkwd = CHKNL | CHKKWD | CHKALIAS;
11169 if (readtoken() != TIN)
11170 raise_error_unexpected_syntax(TIN);
11171 cpp = &n1->ncase.cases;
11173 checkkwd = CHKNL | CHKKWD;
11175 while (t != TESAC) {
11176 if (lasttoken == TLP)
11178 *cpp = cp = stzalloc(sizeof(struct nclist));
11180 app = &cp->nclist.pattern;
11182 *app = ap = stzalloc(sizeof(struct narg));
11184 /*ap->narg.next = NULL; - stzalloc did it */
11185 ap->narg.text = wordtext;
11186 ap->narg.backquote = backquotelist;
11187 if (readtoken() != TPIPE)
11189 app = &ap->narg.next;
11192 //ap->narg.next = NULL;
11193 if (lasttoken != TRP)
11194 raise_error_unexpected_syntax(TRP);
11195 cp->nclist.body = list(2);
11197 cpp = &cp->nclist.next;
11199 checkkwd = CHKNL | CHKKWD;
11203 raise_error_unexpected_syntax(TENDCASE);
11210 n1 = stzalloc(sizeof(struct nredir));
11211 n1->type = NSUBSHELL;
11212 n1->nredir.n = list(0);
11213 /*n1->nredir.redirect = NULL; - stzalloc did it */
11220 IF_ASH_BASH_COMPAT(case TFUNCTION:)
11224 return simplecmd();
11227 if (readtoken() != t)
11228 raise_error_unexpected_syntax(t);
11231 /* Now check for redirection which may follow command */
11232 checkkwd = CHKKWD | CHKALIAS;
11234 while (readtoken() == TREDIR) {
11235 *rpp = n2 = redirnode;
11236 rpp = &n2->nfile.next;
11242 if (n1->type != NSUBSHELL) {
11243 n2 = stzalloc(sizeof(struct nredir));
11248 n1->nredir.redirect = redir;
11253 #if ENABLE_ASH_BASH_COMPAT
11255 decode_dollar_squote(void)
11257 static const char C_escapes[] ALIGN1 = "nrbtfav""x\\01234567";
11263 p = strchr(C_escapes, c);
11268 if ((unsigned char)(c - '0') <= 7) { /* \ooo */
11272 } while ((unsigned char)(c - '0') <= 7 && --cnt);
11274 } else if (c == 'x') { /* \xHH */
11278 } while (isxdigit(c) && --cnt);
11280 if (cnt == 3) { /* \x but next char is "bad" */
11284 } else { /* simple seq like \\ or \t */
11289 c = bb_process_escape_sequence((void*)&p);
11290 } else { /* unrecognized "\z": print both chars unless ' or " */
11291 if (c != '\'' && c != '"') {
11293 c |= 0x100; /* "please encode \, then me" */
11301 * If eofmark is NULL, read a word or a redirection symbol. If eofmark
11302 * is not NULL, read a here document. In the latter case, eofmark is the
11303 * word which marks the end of the document and striptabs is true if
11304 * leading tabs should be stripped from the document. The argument c
11305 * is the first character of the input token or document.
11307 * Because C does not have internal subroutines, I have simulated them
11308 * using goto's to implement the subroutine linkage. The following macros
11309 * will run code that appears at the end of readtoken1.
11311 #define CHECKEND() {goto checkend; checkend_return:;}
11312 #define PARSEREDIR() {goto parseredir; parseredir_return:;}
11313 #define PARSESUB() {goto parsesub; parsesub_return:;}
11314 #define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;}
11315 #define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;}
11316 #define PARSEARITH() {goto parsearith; parsearith_return:;}
11318 readtoken1(int c, int syntax, char *eofmark, int striptabs)
11320 /* NB: syntax parameter fits into smallint */
11321 /* c parameter is an unsigned char or PEOF or PEOA */
11324 char line[EOFMARKLEN + 1];
11325 struct nodelist *bqlist;
11329 smallint prevsyntax; /* syntax before arithmetic */
11330 #if ENABLE_ASH_EXPAND_PRMT
11331 smallint pssyntax; /* we are expanding a prompt string */
11333 int varnest; /* levels of variables expansion */
11334 int arinest; /* levels of arithmetic expansion */
11335 int parenlevel; /* levels of parens in arithmetic */
11336 int dqvarnest; /* levels of variables expansion within double quotes */
11338 IF_ASH_BASH_COMPAT(smallint bash_dollar_squote = 0;)
11340 startlinno = g_parsefile->linno;
11344 #if ENABLE_ASH_EXPAND_PRMT
11345 pssyntax = (syntax == PSSYNTAX);
11349 dblquote = (syntax == DQSYNTAX);
11355 STARTSTACKSTR(out);
11357 /* For each line, until end of word */
11358 CHECKEND(); /* set c to PEOF if at end of here document */
11359 for (;;) { /* until end of line or end of word */
11360 CHECKSTRSPACE(4, out); /* permit 4 calls to USTPUTC */
11361 switch (SIT(c, syntax)) {
11362 case CNL: /* '\n' */
11363 if (syntax == BASESYNTAX)
11364 goto endword; /* exit outer loop */
11368 goto loop; /* continue outer loop */
11373 #if ENABLE_ASH_BASH_COMPAT
11374 if (c == '\\' && bash_dollar_squote) {
11375 c = decode_dollar_squote();
11377 /* skip $'\000', $'\x00' (like bash) */
11381 /* Unknown escape. Encode as '\z' */
11382 c = (unsigned char)c;
11383 if (eofmark == NULL || dblquote)
11384 USTPUTC(CTLESC, out);
11385 USTPUTC('\\', out);
11389 if (eofmark == NULL || dblquote)
11390 USTPUTC(CTLESC, out);
11393 case CBACK: /* backslash */
11394 c = pgetc_without_PEOA();
11396 USTPUTC(CTLESC, out);
11397 USTPUTC('\\', out);
11399 } else if (c == '\n') {
11402 #if ENABLE_ASH_EXPAND_PRMT
11403 if (c == '$' && pssyntax) {
11404 USTPUTC(CTLESC, out);
11405 USTPUTC('\\', out);
11408 /* Backslash is retained if we are in "str" and next char isn't special */
11413 && (c != '"' || eofmark != NULL)
11415 USTPUTC('\\', out);
11417 USTPUTC(CTLESC, out);
11425 if (eofmark == NULL) {
11426 USTPUTC(CTLQUOTEMARK, out);
11434 IF_ASH_BASH_COMPAT(bash_dollar_squote = 0;)
11435 if (eofmark != NULL && varnest == 0) {
11438 if (dqvarnest == 0) {
11439 syntax = BASESYNTAX;
11446 case CVAR: /* '$' */
11447 PARSESUB(); /* parse substitution */
11449 case CENDVAR: /* '}' */
11452 if (dqvarnest > 0) {
11459 #if ENABLE_SH_MATH_SUPPORT
11460 case CLP: /* '(' in arithmetic */
11464 case CRP: /* ')' in arithmetic */
11465 if (parenlevel > 0) {
11468 if (pgetc_eatbnl() == ')') {
11470 if (--arinest == 0) {
11471 syntax = prevsyntax;
11475 * unbalanced parens
11476 * (don't 2nd guess - no error)
11484 case CBQUOTE: /* '`' */
11488 goto endword; /* exit outer loop */
11492 if (varnest == 0) {
11493 #if ENABLE_ASH_BASH_COMPAT
11495 //Can't call pgetc_eatbnl() here, this requires three-deep pungetc()
11496 if (pgetc() == '>')
11497 c = 0x100 + '>'; /* flag &> */
11501 goto endword; /* exit outer loop */
11503 IF_ASH_ALIAS(if (c != PEOA))
11510 #if ENABLE_SH_MATH_SUPPORT
11511 if (syntax == ARISYNTAX)
11512 raise_error_syntax("missing '))'");
11514 if (syntax != BASESYNTAX && eofmark == NULL)
11515 raise_error_syntax("unterminated quoted string");
11516 if (varnest != 0) {
11517 startlinno = g_parsefile->linno;
11519 raise_error_syntax("missing '}'");
11521 USTPUTC('\0', out);
11522 len = out - (char *)stackblock();
11523 out = stackblock();
11524 if (eofmark == NULL) {
11525 if ((c == '>' || c == '<' IF_ASH_BASH_COMPAT( || c == 0x100 + '>'))
11528 if (isdigit_str9(out)) {
11529 PARSEREDIR(); /* passed as params: out, c */
11530 lasttoken = TREDIR;
11533 /* else: non-number X seen, interpret it
11534 * as "NNNX>file" = "NNNX >file" */
11538 quoteflag = quotef;
11539 backquotelist = bqlist;
11540 grabstackblock(len);
11544 /* end of readtoken routine */
11547 * Check to see whether we are at the end of the here document. When this
11548 * is called, c is set to the first character of the next input line. If
11549 * we are at the end of the here document, this routine sets the c to PEOF.
11553 #if ENABLE_ASH_ALIAS
11555 c = pgetc_without_PEOA();
11558 while (c == '\t') {
11559 c = pgetc_without_PEOA();
11562 if (c == *eofmark) {
11563 if (pfgets(line, sizeof(line)) != NULL) {
11568 for (q = eofmark + 1;; p++, q++) {
11572 if (!*q || cc != *q)
11579 pushstring(line, NULL);
11584 goto checkend_return;
11588 * Parse a redirection operator. The variable "out" points to a string
11589 * specifying the fd to be redirected. The variable "c" contains the
11590 * first character of the redirection operator.
11593 /* out is already checked to be a valid number or "" */
11594 int fd = (*out == '\0' ? -1 : atoi(out));
11597 np = stzalloc(sizeof(struct nfile));
11602 np->type = NAPPEND;
11604 np->type = NCLOBBER;
11607 /* it also can be NTO2 (>&file), but we can't figure it out yet */
11613 #if ENABLE_ASH_BASH_COMPAT
11614 else if (c == 0x100 + '>') { /* this flags &> redirection */
11616 pgetc(); /* this is '>', no need to check */
11620 else { /* c == '<' */
11621 /*np->nfile.fd = 0; - stzalloc did it */
11625 if (sizeof(struct nfile) != sizeof(struct nhere)) {
11626 np = stzalloc(sizeof(struct nhere));
11627 /*np->nfile.fd = 0; - stzalloc did it */
11630 heredoc = stzalloc(sizeof(struct heredoc));
11631 heredoc->here = np;
11634 heredoc->striptabs = 1;
11636 /*heredoc->striptabs = 0; - stzalloc did it */
11642 np->type = NFROMFD;
11646 np->type = NFROMTO;
11658 goto parseredir_return;
11662 * Parse a substitution. At this point, we have read the dollar sign
11663 * and nothing else.
11666 /* is_special(c) evaluates to 1 for c in "!#$*-0123456789?@"; 0 otherwise
11667 * (assuming ascii char codes, as the original implementation did) */
11668 #define is_special(c) \
11669 (((unsigned)(c) - 33 < 32) \
11670 && ((0xc1ff920dU >> ((unsigned)(c) - 33)) & 1))
11672 unsigned char subtype;
11675 c = pgetc_eatbnl();
11676 if (c > 255 /* PEOA or PEOF */
11677 || (c != '(' && c != '{' && !is_name(c) && !is_special(c))
11679 #if ENABLE_ASH_BASH_COMPAT
11680 if (syntax != DQSYNTAX && c == '\'')
11681 bash_dollar_squote = 1;
11686 } else if (c == '(') {
11687 /* $(command) or $((arith)) */
11688 if (pgetc_eatbnl() == '(') {
11689 #if ENABLE_SH_MATH_SUPPORT
11692 raise_error_syntax("you disabled math support for $((arith)) syntax");
11699 /* $VAR, $<specialchar>, ${...}, or PEOA/PEOF */
11700 USTPUTC(CTLVAR, out);
11701 typeloc = out - (char *)stackblock();
11703 subtype = VSNORMAL;
11705 c = pgetc_eatbnl();
11710 /* $[{[#]]NAME[}] */
11713 c = pgetc_eatbnl();
11714 } while (is_in_name(c));
11715 } else if (isdigit(c)) {
11716 /* $[{[#]]NUM[}] */
11719 c = pgetc_eatbnl();
11720 } while (isdigit(c));
11721 } else if (is_special(c)) {
11722 /* $[{[#]]<specialchar>[}] */
11725 c = pgetc_eatbnl();
11726 if (!subtype && cc == '#') {
11727 subtype = VSLENGTH;
11728 if (c == '_' || isalnum(c))
11731 c = pgetc_eatbnl();
11732 if (cc == '}' || c != '}') {
11743 if (c != '}' && subtype == VSLENGTH) {
11744 /* ${#VAR didn't end with } */
11748 if (subtype == 0) {
11749 static const char types[] ALIGN1 = "}-+?=";
11750 /* ${VAR...} but not $VAR or ${#VAR} */
11751 /* c == first char after VAR */
11754 c = pgetc_eatbnl();
11755 #if ENABLE_ASH_BASH_COMPAT
11756 /* This check is only needed to not misinterpret
11757 * ${VAR:-WORD}, ${VAR:+WORD}, ${VAR:=WORD}, ${VAR:?WORD}
11760 if (!strchr(types, c)) {
11761 subtype = VSSUBSTR;
11763 break; /* "goto badsub" is bigger (!) */
11769 const char *p = strchr(types, c);
11772 subtype |= p - types + VSNORMAL;
11778 subtype = (c == '#' ? VSTRIMLEFT : VSTRIMRIGHT);
11779 c = pgetc_eatbnl();
11785 #if ENABLE_ASH_BASH_COMPAT
11787 /* ${v/[/]pattern/repl} */
11788 //TODO: encode pattern and repl separately.
11789 // Currently ${v/$var_with_slash/repl} is horribly broken
11790 subtype = VSREPLACE;
11791 c = pgetc_eatbnl();
11794 subtype++; /* VSREPLACEALL */
11802 ((unsigned char *)stackblock())[typeloc] = subtype;
11803 if (subtype != VSNORMAL) {
11810 goto parsesub_return;
11814 * Called to parse command substitutions. Newstyle is set if the command
11815 * is enclosed inside $(...); nlpp is a pointer to the head of the linked
11816 * list of commands (passed by reference), and savelen is the number of
11817 * characters on the top of the stack which must be preserved.
11820 struct nodelist **nlpp;
11824 smallint saveprompt = 0;
11827 savelen = out - (char *)stackblock();
11830 * FIXME: this can allocate very large block on stack and SEGV.
11832 * echo "..<100kbytes>..`true` $(true) `true` ..."
11833 * allocates 100kb for every command subst. With about
11834 * a hundred command substitutions stack overflows.
11835 * With larger prepended string, SEGV happens sooner.
11837 str = alloca(savelen);
11838 memcpy(str, stackblock(), savelen);
11842 /* We must read until the closing backquote, giving special
11843 * treatment to some slashes, and then push the string and
11844 * reread it as input, interpreting it normally.
11850 STARTSTACKSTR(pout);
11854 setprompt_if(needprompt, 2);
11865 * If eating a newline, avoid putting
11866 * the newline into the new character
11867 * stream (via the STPUTC after the
11872 if (pc != '\\' && pc != '`' && pc != '$'
11873 && (!dblquote || pc != '"')
11875 STPUTC('\\', pout);
11877 if (pc <= 255 /* not PEOA or PEOF */) {
11883 IF_ASH_ALIAS(case PEOA:)
11884 startlinno = g_parsefile->linno;
11885 raise_error_syntax("EOF in backquote substitution");
11897 STPUTC('\0', pout);
11898 psavelen = pout - (char *)stackblock();
11899 if (psavelen > 0) {
11900 pstr = grabstackstr(pout);
11901 setinputstring(pstr);
11906 nlpp = &(*nlpp)->next;
11907 *nlpp = stzalloc(sizeof(**nlpp));
11908 /* (*nlpp)->next = NULL; - stzalloc did it */
11911 saveprompt = doprompt;
11918 doprompt = saveprompt;
11919 else if (readtoken() != TRP)
11920 raise_error_unexpected_syntax(TRP);
11925 * Start reading from old file again, ignoring any pushed back
11926 * tokens left from the backquote parsing
11931 while (stackblocksize() <= savelen)
11933 STARTSTACKSTR(out);
11935 memcpy(out, str, savelen);
11936 STADJUST(savelen, out);
11938 USTPUTC(CTLBACKQ, out);
11940 goto parsebackq_oldreturn;
11941 goto parsebackq_newreturn;
11944 #if ENABLE_SH_MATH_SUPPORT
11946 * Parse an arithmetic expansion (indicate start of one and set state)
11949 if (++arinest == 1) {
11950 prevsyntax = syntax;
11951 syntax = ARISYNTAX;
11953 USTPUTC(CTLARI, out);
11954 goto parsearith_return;
11957 } /* end of readtoken */
11960 * Read the next input token.
11961 * If the token is a word, we set backquotelist to the list of cmds in
11962 * backquotes. We set quoteflag to true if any part of the word was
11964 * If the token is TREDIR, then we set redirnode to a structure containing
11966 * In all cases, the variable startlinno is set to the number of the line
11967 * on which the token starts.
11969 * [Change comment: here documents and internal procedures]
11970 * [Readtoken shouldn't have any arguments. Perhaps we should make the
11971 * word parsing code into a separate routine. In this case, readtoken
11972 * doesn't need to have any internal procedures, but parseword does.
11973 * We could also make parseoperator in essence the main routine, and
11974 * have parseword (readtoken1?) handle both words and redirection.]
11976 #define NEW_xxreadtoken
11977 #ifdef NEW_xxreadtoken
11978 /* singles must be first! */
11979 static const char xxreadtoken_chars[7] ALIGN1 = {
11980 '\n', '(', ')', /* singles */
11981 '&', '|', ';', /* doubles */
11985 #define xxreadtoken_singles 3
11986 #define xxreadtoken_doubles 3
11988 static const char xxreadtoken_tokens[] ALIGN1 = {
11989 TNL, TLP, TRP, /* only single occurrence allowed */
11990 TBACKGND, TPIPE, TSEMI, /* if single occurrence */
11991 TEOF, /* corresponds to trailing nul */
11992 TAND, TOR, TENDCASE /* if double occurrence */
12004 setprompt_if(needprompt, 2);
12005 startlinno = g_parsefile->linno;
12006 for (;;) { /* until token or start of word found */
12008 if (c == ' ' || c == '\t' IF_ASH_ALIAS( || c == PEOA))
12012 while ((c = pgetc()) != '\n' && c != PEOF)
12015 } else if (c == '\\') {
12016 if (pgetc() != '\n') {
12018 break; /* return readtoken1(...) */
12024 p = xxreadtoken_chars + sizeof(xxreadtoken_chars) - 1;
12030 p = strchr(xxreadtoken_chars, c);
12032 break; /* return readtoken1(...) */
12034 if ((int)(p - xxreadtoken_chars) >= xxreadtoken_singles) {
12036 if (cc == c) { /* double occurrence? */
12037 p += xxreadtoken_doubles + 1;
12040 #if ENABLE_ASH_BASH_COMPAT
12041 if (c == '&' && cc == '>') /* &> */
12042 break; /* return readtoken1(...) */
12047 lasttoken = xxreadtoken_tokens[p - xxreadtoken_chars];
12052 return readtoken1(c, BASESYNTAX, (char *) NULL, 0);
12054 #else /* old xxreadtoken */
12055 #define RETURN(token) return lasttoken = token
12065 setprompt_if(needprompt, 2);
12066 startlinno = g_parsefile->linno;
12067 for (;;) { /* until token or start of word found */
12070 case ' ': case '\t':
12071 IF_ASH_ALIAS(case PEOA:)
12074 while ((c = pgetc()) != '\n' && c != PEOF)
12079 if (pgetc() == '\n') {
12091 if (pgetc() == '&')
12096 if (pgetc() == '|')
12101 if (pgetc() == ';')
12114 return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
12117 #endif /* old xxreadtoken */
12123 int kwd = checkkwd;
12125 smallint alreadyseen = tokpushback;
12128 #if ENABLE_ASH_ALIAS
12144 if (t != TWORD || quoteflag) {
12149 * check for keywords
12151 if (kwd & CHKKWD) {
12152 const char *const *pp;
12154 pp = findkwd(wordtext);
12156 lasttoken = t = pp - tokname_array;
12157 TRACE(("keyword '%s' recognized\n", tokname_array[t]));
12162 if (checkkwd & CHKALIAS) {
12163 #if ENABLE_ASH_ALIAS
12165 ap = lookupalias(wordtext, 1);
12168 pushstring(ap->val, ap);
12178 TRACE(("token '%s' %s\n", tokname_array[t], t == TWORD ? wordtext : ""));
12180 TRACE(("reread token '%s' %s\n", tokname_array[t], t == TWORD ? wordtext : ""));
12196 * Read and parse a command. Returns NODE_EOF on end of file.
12197 * (NULL is a valid parse tree indicating a blank line.)
12199 static union node *
12200 parsecmd(int interact)
12205 doprompt = interact;
12206 setprompt_if(doprompt, doprompt);
12212 * Input any here documents.
12217 struct heredoc *here;
12220 here = heredoclist;
12221 heredoclist = NULL;
12224 setprompt_if(needprompt, 2);
12225 readtoken1(pgetc(), here->here->type == NHERE ? SQSYNTAX : DQSYNTAX,
12226 here->eofmark, here->striptabs);
12227 n = stzalloc(sizeof(struct narg));
12228 n->narg.type = NARG;
12229 /*n->narg.next = NULL; - stzalloc did it */
12230 n->narg.text = wordtext;
12231 n->narg.backquote = backquotelist;
12232 here->here->nhere.doc = n;
12239 * called by editline -- any expansions to the prompt should be added here.
12241 #if ENABLE_ASH_EXPAND_PRMT
12242 static const char *
12243 expandstr(const char *ps)
12248 /* XXX Fix (char *) cast. It _is_ a bug. ps is variable's value,
12249 * and token processing _can_ alter it (delete NULs etc). */
12250 setinputstring((char *)ps);
12252 saveprompt = doprompt;
12254 readtoken1(pgetc(), PSSYNTAX, nullstr, 0);
12255 doprompt = saveprompt;
12259 n.narg.type = NARG;
12260 n.narg.next = NULL;
12261 n.narg.text = wordtext;
12262 n.narg.backquote = backquotelist;
12264 expandarg(&n, NULL, EXP_QUOTED);
12265 return stackblock();
12270 * Execute a command or commands contained in a string.
12273 evalstring(char *s, int flags)
12276 struct stackmark smark;
12281 setstackmark(&smark);
12284 while ((n = parsecmd(0)) != NODE_EOF) {
12287 i = evaltree(n, flags);
12290 popstackmark(&smark);
12294 popstackmark(&smark);
12302 * The eval command.
12304 static int FAST_FUNC
12305 evalcmd(int argc UNUSED_PARAM, char **argv, int flags)
12314 STARTSTACKSTR(concat);
12316 concat = stack_putstr(p, concat);
12320 STPUTC(' ', concat);
12322 STPUTC('\0', concat);
12323 p = grabstackstr(concat);
12325 return evalstring(p, flags & EV_TESTED);
12331 * Read and execute commands.
12332 * "Top" is nonzero for the top level command loop;
12333 * it turns on prompting if the shell is interactive.
12339 struct stackmark smark;
12344 TRACE(("cmdloop(%d) called\n", top));
12348 setstackmark(&smark);
12351 showjobs(SHOW_CHANGED|SHOW_STDERR);
12354 if (iflag && top) {
12358 n = parsecmd(inter);
12360 if (DEBUG > 2 && debug && (n != NODE_EOF))
12363 if (n == NODE_EOF) {
12364 if (!top || numeof >= 50)
12366 if (!stoppedjobs()) {
12369 out2str("\nUse \"exit\" to leave shell.\n");
12372 } else if (nflag == 0) {
12375 /* job_warning can only be 2,1,0. Here 2->1, 1/0->0 */
12378 i = evaltree(n, 0);
12382 popstackmark(&smark);
12386 evalskip &= ~SKIPFUNC;
12394 * Take commands from a file. To be compatible we should do a path
12395 * search for the file, which is necessary to find sub-commands.
12398 find_dot_file(char *name)
12401 const char *path = pathval();
12404 /* don't try this for absolute or relative paths */
12405 if (strchr(name, '/'))
12408 /* IIRC standards do not say whether . is to be searched.
12409 * And it is even smaller this way, making it unconditional for now:
12411 if (1) { /* ENABLE_ASH_BASH_COMPAT */
12416 while ((fullname = path_advance(&path, name)) != NULL) {
12418 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
12420 * Don't bother freeing here, since it will
12421 * be freed by the caller.
12425 if (fullname != name)
12426 stunalloc(fullname);
12429 /* not found in the PATH */
12430 ash_msg_and_raise_error("%s: not found", name);
12434 static int FAST_FUNC
12435 dotcmd(int argc_ UNUSED_PARAM, char **argv_ UNUSED_PARAM)
12437 /* "false; . empty_file; echo $?" should print 0, not 1: */
12441 struct strlist *sp;
12442 volatile struct shparam saveparam;
12444 for (sp = cmdenviron; sp; sp = sp->next)
12445 setvareq(ckstrdup(sp->text), VSTRFIXED | VTEXTFIXED);
12447 nextopt(nullstr); /* handle possible "--" */
12451 /* bash says: "bash: .: filename argument required" */
12452 return 2; /* bash compat */
12455 /* This aborts if file isn't found, which is POSIXly correct.
12456 * bash returns exitcode 1 instead.
12458 fullname = find_dot_file(argv[0]);
12460 if (argv[0]) { /* . FILE ARGS, ARGS exist */
12462 saveparam = shellparam;
12463 shellparam.malloced = 0;
12467 shellparam.nparam = argc;
12468 shellparam.p = argv;
12471 /* This aborts if file can't be opened, which is POSIXly correct.
12472 * bash returns exitcode 1 instead.
12474 setinputfile(fullname, INPUT_PUSH_FILE);
12475 commandname = fullname;
12476 status = cmdloop(0);
12480 freeparam(&shellparam);
12481 shellparam = saveparam;
12487 static int FAST_FUNC
12488 exitcmd(int argc UNUSED_PARAM, char **argv)
12493 exitstatus = number(argv[1]);
12494 raise_exception(EXEXIT);
12499 * Read a file containing shell functions.
12502 readcmdfile(char *name)
12504 setinputfile(name, INPUT_PUSH_FILE);
12510 /* ============ find_command inplementation */
12513 * Resolve a command name. If you change this routine, you may have to
12514 * change the shellexec routine as well.
12517 find_command(char *name, struct cmdentry *entry, int act, const char *path)
12519 struct tblentry *cmdp;
12526 struct builtincmd *bcmd;
12528 /* If name contains a slash, don't use PATH or hash table */
12529 if (strchr(name, '/') != NULL) {
12530 entry->u.index = -1;
12531 if (act & DO_ABS) {
12532 while (stat(name, &statb) < 0) {
12534 if (errno == EINTR)
12537 entry->cmdtype = CMDUNKNOWN;
12541 entry->cmdtype = CMDNORMAL;
12545 /* #if ENABLE_FEATURE_SH_STANDALONE... moved after builtin check */
12547 updatetbl = (path == pathval());
12550 if (strstr(path, "%builtin") != NULL)
12551 act |= DO_ALTBLTIN;
12554 /* If name is in the table, check answer will be ok */
12555 cmdp = cmdlookup(name, 0);
12556 if (cmdp != NULL) {
12559 switch (cmdp->cmdtype) {
12577 } else if (cmdp->rehash == 0)
12578 /* if not invalidated by cd, we're done */
12582 /* If %builtin not in path, check for builtin next */
12583 bcmd = find_builtin(name);
12585 if (IS_BUILTIN_REGULAR(bcmd))
12586 goto builtin_success;
12587 if (act & DO_ALTPATH) {
12588 if (!(act & DO_ALTBLTIN))
12589 goto builtin_success;
12590 } else if (builtinloc <= 0) {
12591 goto builtin_success;
12595 #if ENABLE_FEATURE_SH_STANDALONE
12597 int applet_no = find_applet_by_name(name);
12598 if (applet_no >= 0) {
12599 entry->cmdtype = CMDNORMAL;
12600 entry->u.index = -2 - applet_no;
12606 /* We have to search path. */
12607 prev = -1; /* where to start */
12608 if (cmdp && cmdp->rehash) { /* doing a rehash */
12609 if (cmdp->cmdtype == CMDBUILTIN)
12612 prev = cmdp->param.index;
12618 while ((fullname = path_advance(&path, name)) != NULL) {
12619 stunalloc(fullname);
12620 /* NB: code below will still use fullname
12621 * despite it being "unallocated" */
12624 if (prefix(pathopt, "builtin")) {
12626 goto builtin_success;
12629 if ((act & DO_NOFUNC)
12630 || !prefix(pathopt, "func")
12631 ) { /* ignore unimplemented options */
12635 /* if rehash, don't redo absolute path names */
12636 if (fullname[0] == '/' && idx <= prev) {
12639 TRACE(("searchexec \"%s\": no change\n", name));
12642 while (stat(fullname, &statb) < 0) {
12644 if (errno == EINTR)
12647 if (errno != ENOENT && errno != ENOTDIR)
12651 e = EACCES; /* if we fail, this will be the error */
12652 if (!S_ISREG(statb.st_mode))
12654 if (pathopt) { /* this is a %func directory */
12655 stalloc(strlen(fullname) + 1);
12656 /* NB: stalloc will return space pointed by fullname
12657 * (because we don't have any intervening allocations
12658 * between stunalloc above and this stalloc) */
12659 readcmdfile(fullname);
12660 cmdp = cmdlookup(name, 0);
12661 if (cmdp == NULL || cmdp->cmdtype != CMDFUNCTION)
12662 ash_msg_and_raise_error("%s not defined in %s", name, fullname);
12663 stunalloc(fullname);
12666 TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
12668 entry->cmdtype = CMDNORMAL;
12669 entry->u.index = idx;
12673 cmdp = cmdlookup(name, 1);
12674 cmdp->cmdtype = CMDNORMAL;
12675 cmdp->param.index = idx;
12680 /* We failed. If there was an entry for this command, delete it */
12681 if (cmdp && updatetbl)
12682 delete_cmd_entry();
12684 ash_msg("%s: %s", name, errmsg(e, "not found"));
12685 entry->cmdtype = CMDUNKNOWN;
12690 entry->cmdtype = CMDBUILTIN;
12691 entry->u.cmd = bcmd;
12695 cmdp = cmdlookup(name, 1);
12696 cmdp->cmdtype = CMDBUILTIN;
12697 cmdp->param.cmd = bcmd;
12701 entry->cmdtype = cmdp->cmdtype;
12702 entry->u = cmdp->param;
12707 * The trap builtin.
12709 static int FAST_FUNC
12710 trapcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12714 int signo, exitcode;
12719 for (signo = 0; signo < NSIG; signo++) {
12720 char *tr = trap_ptr[signo];
12722 /* note: bash adds "SIG", but only if invoked
12723 * as "bash". If called as "sh", or if set -o posix,
12724 * then it prints short signal names.
12725 * We are printing short names: */
12726 out1fmt("trap -- %s %s\n",
12728 get_signame(signo));
12729 /* trap_ptr != trap only if we are in special-cased `trap` code.
12730 * In this case, we will exit very soon, no need to free(). */
12731 /* if (trap_ptr != trap && tp[0]) */
12736 if (trap_ptr != trap) {
12749 signo = get_signum(*ap);
12751 /* Mimic bash message exactly */
12752 ash_msg("%s: invalid signal specification", *ap);
12758 if (LONE_DASH(action))
12761 action = ckstrdup(action);
12765 may_have_traps = 1;
12766 trap[signo] = action;
12777 /* ============ Builtins */
12779 #if ENABLE_ASH_HELP
12780 static int FAST_FUNC
12781 helpcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12787 "Built-in commands:\n"
12788 "------------------\n");
12789 for (col = 0, i = 0; i < ARRAY_SIZE(builtintab); i++) {
12790 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '),
12791 builtintab[i].name + 1);
12797 # if ENABLE_FEATURE_SH_STANDALONE
12799 const char *a = applet_names;
12801 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '), a);
12806 while (*a++ != '\0')
12811 newline_and_flush(stdout);
12812 return EXIT_SUCCESS;
12817 static int FAST_FUNC
12818 historycmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12820 show_history(line_input_state);
12821 return EXIT_SUCCESS;
12826 * The export and readonly commands.
12828 static int FAST_FUNC
12829 exportcmd(int argc UNUSED_PARAM, char **argv)
12839 /* "readonly" in bash accepts, but ignores -n.
12840 * We do the same: it saves a conditional in nextopt's param.
12843 while ((opt = nextopt("np")) != '\0') {
12845 flag_off = VEXPORT;
12848 if (argv[0][0] == 'r') {
12850 flag_off = 0; /* readonly ignores -n */
12852 flag_off = ~flag_off;
12854 /*if (opt_p_not_specified) - bash doesnt check this. Try "export -p NAME" */
12860 p = strchr(name, '=');
12864 vp = *findvar(hashvar(name), name);
12866 vp->flags = ((vp->flags | flag) & flag_off);
12870 setvar(name, p, (flag & flag_off));
12871 } while ((name = *++aptr) != NULL);
12876 /* No arguments. Show the list of exported or readonly vars.
12879 showvars(argv[0], flag, 0);
12884 * Delete a function if it exists.
12887 unsetfunc(const char *name)
12889 struct tblentry *cmdp;
12891 cmdp = cmdlookup(name, 0);
12892 if (cmdp != NULL && cmdp->cmdtype == CMDFUNCTION)
12893 delete_cmd_entry();
12897 * The unset builtin command. We unset the function before we unset the
12898 * variable to allow a function to be unset when there is a readonly variable
12899 * with the same name.
12901 static int FAST_FUNC
12902 unsetcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12909 while ((i = nextopt("vf")) != 0) {
12913 for (ap = argptr; *ap; ap++) {
12926 static const unsigned char timescmd_str[] ALIGN1 = {
12927 ' ', offsetof(struct tms, tms_utime),
12928 '\n', offsetof(struct tms, tms_stime),
12929 ' ', offsetof(struct tms, tms_cutime),
12930 '\n', offsetof(struct tms, tms_cstime),
12933 static int FAST_FUNC
12934 timescmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12936 unsigned long clk_tck, s, t;
12937 const unsigned char *p;
12940 clk_tck = bb_clk_tck();
12945 t = *(clock_t *)(((char *) &buf) + p[1]);
12948 out1fmt("%lum%lu.%03lus%c",
12950 (t * 1000) / clk_tck,
12958 #if ENABLE_SH_MATH_SUPPORT
12960 * The let builtin. Partially stolen from GNU Bash, the Bourne Again SHell.
12961 * Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
12963 * Copyright (C) 2003 Vladimir Oleynik <dzo@simtreas.ru>
12965 static int FAST_FUNC
12966 letcmd(int argc UNUSED_PARAM, char **argv)
12972 ash_msg_and_raise_error("expression expected");
12974 i = ash_arith(*argv);
12982 * The read builtin. Options:
12983 * -r Do not interpret '\' specially
12984 * -s Turn off echo (tty only)
12985 * -n NCHARS Read NCHARS max
12986 * -p PROMPT Display PROMPT on stderr (if input is from tty)
12987 * -t SECONDS Timeout after SECONDS (tty or pipe only)
12988 * -u FD Read from given FD instead of fd 0
12989 * This uses unbuffered input, which may be avoidable in some cases.
12990 * TODO: bash also has:
12991 * -a ARRAY Read into array[0],[1],etc
12992 * -d DELIM End on DELIM char, not newline
12993 * -e Use line editing (tty only)
12995 static int FAST_FUNC
12996 readcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12998 char *opt_n = NULL;
12999 char *opt_p = NULL;
13000 char *opt_t = NULL;
13001 char *opt_u = NULL;
13002 int read_flags = 0;
13006 while ((i = nextopt("p:u:rt:n:s")) != '\0') {
13015 read_flags |= BUILTIN_READ_SILENT;
13021 read_flags |= BUILTIN_READ_RAW;
13031 /* "read -s" needs to save/restore termios, can't allow ^C
13032 * to jump out of it.
13035 r = shell_builtin_read(setvar0,
13037 bltinlookup("IFS"), /* can be NULL */
13046 if ((uintptr_t)r > 1)
13047 ash_msg_and_raise_error(r);
13049 return (uintptr_t)r;
13052 static int FAST_FUNC
13053 umaskcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
13055 static const char permuser[3] ALIGN1 = "ogu";
13058 int symbolic_mode = 0;
13060 while (nextopt("S") != '\0') {
13069 if (*argptr == NULL) {
13070 if (symbolic_mode) {
13071 char buf[sizeof(",u=rwx,g=rwx,o=rwx")];
13078 *p++ = permuser[i];
13080 /* mask is 0..0uuugggooo. i=2 selects uuu bits */
13081 if (!(mask & 0400)) *p++ = 'r';
13082 if (!(mask & 0200)) *p++ = 'w';
13083 if (!(mask & 0100)) *p++ = 'x';
13091 out1fmt("%04o\n", mask);
13094 char *modestr = *argptr;
13095 /* numeric umasks are taken as-is */
13096 /* symbolic umasks are inverted: "umask a=rx" calls umask(222) */
13097 if (!isdigit(modestr[0]))
13099 mask = bb_parse_mode(modestr, mask);
13100 if ((unsigned)mask > 0777) {
13101 ash_msg_and_raise_error("illegal mode: %s", modestr);
13103 if (!isdigit(modestr[0]))
13110 static int FAST_FUNC
13111 ulimitcmd(int argc UNUSED_PARAM, char **argv)
13113 return shell_builtin_ulimit(argv);
13116 /* ============ main() and helpers */
13119 * Called to exit the shell.
13128 #if ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
13129 save_history(line_input_state);
13131 status = exitstatus;
13132 TRACE(("pid %d, exitshell(%d)\n", getpid(), status));
13133 if (setjmp(loc.loc)) {
13134 if (exception_type == EXEXIT)
13135 status = exitstatus;
13138 exception_handler = &loc;
13144 /*free(p); - we'll exit soon */
13147 /* dash wraps setjobctl(0) in "if (setjmp(loc.loc) == 0) {...}".
13148 * our setjobctl(0) does not panic if tcsetpgrp fails inside it.
13151 flush_stdout_stderr();
13159 /* we will never free this */
13160 basepf.next_to_pgetc = basepf.buf = ckmalloc(IBUFSIZ);
13162 signal(SIGCHLD, SIG_DFL);
13163 /* bash re-enables SIGHUP which is SIG_IGNed on entry.
13164 * Try: "trap '' HUP; bash; echo RET" and type "kill -HUP $$"
13166 signal(SIGHUP, SIG_DFL);
13171 struct stat st1, st2;
13174 for (envp = environ; envp && *envp; envp++) {
13175 p = endofname(*envp);
13176 if (p != *envp && *p == '=') {
13177 setvareq(*envp, VEXPORT|VTEXTFIXED);
13181 setvareq((char*)defoptindvar, VTEXTFIXED);
13183 setvar0("PPID", utoa(getppid()));
13184 #if ENABLE_ASH_BASH_COMPAT
13185 p = lookupvar("SHLVL");
13186 setvar("SHLVL", utoa((p ? atoi(p) : 0) + 1), VEXPORT);
13187 if (!lookupvar("HOSTNAME")) {
13188 struct utsname uts;
13190 setvar0("HOSTNAME", uts.nodename);
13193 p = lookupvar("PWD");
13195 if (p[0] != '/' || stat(p, &st1) || stat(".", &st2)
13196 || st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino
13206 //usage:#define ash_trivial_usage
13207 //usage: "[-/+OPTIONS] [-/+o OPT]... [-c 'SCRIPT' [ARG0 [ARGS]] / FILE [ARGS]]"
13208 //usage:#define ash_full_usage "\n\n"
13209 //usage: "Unix shell interpreter"
13211 //usage:#if ENABLE_FEATURE_SH_IS_ASH
13212 //usage:# define sh_trivial_usage ash_trivial_usage
13213 //usage:# define sh_full_usage ash_full_usage
13215 //usage:#if ENABLE_FEATURE_BASH_IS_ASH
13216 //usage:# define bash_trivial_usage ash_trivial_usage
13217 //usage:# define bash_full_usage ash_full_usage
13221 * Process the shell command line arguments.
13224 procargs(char **argv)
13227 const char *xminusc;
13232 /* if (xargv[0]) - mmm, this is always true! */
13234 for (i = 0; i < NOPTS; i++)
13237 if (options(/*cmdline:*/ 1)) {
13238 /* it already printed err message */
13239 raise_exception(EXERROR);
13243 if (*xargv == NULL) {
13245 ash_msg_and_raise_error(bb_msg_requires_arg, "-c");
13248 if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
13252 for (i = 0; i < NOPTS; i++)
13253 if (optlist[i] == 2)
13258 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
13263 } else if (!sflag) {
13264 setinputfile(*xargv, 0);
13267 commandname = arg0;
13270 shellparam.p = xargv;
13271 #if ENABLE_ASH_GETOPTS
13272 shellparam.optind = 1;
13273 shellparam.optoff = -1;
13275 /* assert(shellparam.malloced == 0 && shellparam.nparam == 0); */
13277 shellparam.nparam++;
13284 * Read /etc/profile or .profile.
13287 read_profile(const char *name)
13289 if (setinputfile(name, INPUT_PUSH_FILE | INPUT_NOFILE_OK) < 0)
13296 * This routine is called when an error or an interrupt occurs in an
13297 * interactive shell and control is returned to the main command loop.
13305 /* from input.c: */
13306 g_parsefile->left_in_buffer = 0;
13307 g_parsefile->left_in_line = 0; /* clear input buffer */
13309 /* from parser.c: */
13312 /* from redir.c: */
13314 popredir(/*drop:*/ 0, /*restore:*/ 0);
13318 static short profile_buf[16384];
13319 extern int etext();
13323 * Main routine. We initialize things, parse the arguments, execute
13324 * profiles if we're a login shell, and then call cmdloop to execute
13325 * commands. The setjmp call sets up the location to jump to when an
13326 * exception occurs. When an exception occurs the variable "state"
13327 * is used to figure out how far we had gotten.
13329 int ash_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
13330 int ash_main(int argc UNUSED_PARAM, char **argv)
13332 const char *shinit;
13333 volatile smallint state;
13334 struct jmploc jmploc;
13335 struct stackmark smark;
13337 /* Initialize global data */
13341 #if ENABLE_ASH_ALIAS
13347 monitor(4, etext, profile_buf, sizeof(profile_buf), 50);
13350 #if ENABLE_FEATURE_EDITING
13351 line_input_state = new_line_input_t(FOR_SHELL | WITH_PATH_LOOKUP);
13354 if (setjmp(jmploc.loc)) {
13360 e = exception_type;
13362 if (e == EXEXIT || s == 0 || iflag == 0 || shlvl) {
13366 newline_and_flush(stderr);
13369 popstackmark(&smark);
13370 FORCE_INT_ON; /* enable interrupts */
13379 exception_handler = &jmploc;
13382 TRACE(("Shell args: "));
13383 trace_puts_args(argv);
13385 rootpid = getpid();
13388 setstackmark(&smark);
13391 if (argv[0] && argv[0][0] == '-')
13397 read_profile("/etc/profile");
13400 hp = lookupvar("HOME");
13402 hp = concat_path_file(hp, ".profile");
13411 getuid() == geteuid() && getgid() == getegid() &&
13415 shinit = lookupvar("ENV");
13416 if (shinit != NULL && *shinit != '\0') {
13417 read_profile(shinit);
13423 /* evalstring pushes parsefile stack.
13424 * Ensure we don't falsely claim that 0 (stdin)
13425 * is one of stacked source fds.
13426 * Testcase: ash -c 'exec 1>&0' must not complain. */
13427 // if (!sflag) g_parsefile->pf_fd = -1;
13428 // ^^ not necessary since now we special-case fd 0
13429 // in is_hidden_fd() to not be considered "hidden fd"
13430 evalstring(minusc, 0);
13433 if (sflag || minusc == NULL) {
13434 #if MAX_HISTORY > 0 && ENABLE_FEATURE_EDITING_SAVEHISTORY
13436 const char *hp = lookupvar("HISTFILE");
13438 hp = lookupvar("HOME");
13440 hp = concat_path_file(hp, ".ash_history");
13441 setvar0("HISTFILE", hp);
13443 hp = lookupvar("HISTFILE");
13447 line_input_state->hist_file = hp;
13448 # if ENABLE_FEATURE_SH_HISTFILESIZE
13449 hp = lookupvar("HISTFILESIZE");
13450 line_input_state->max_history = size_from_HISTFILESIZE(hp);
13454 state4: /* XXX ??? - why isn't this before the "if" statement */
13462 extern void _mcleanup(void);
13466 TRACE(("End of main reached\n"));
13473 * Copyright (c) 1989, 1991, 1993, 1994
13474 * The Regents of the University of California. All rights reserved.
13476 * This code is derived from software contributed to Berkeley by
13477 * Kenneth Almquist.
13479 * Redistribution and use in source and binary forms, with or without
13480 * modification, are permitted provided that the following conditions
13482 * 1. Redistributions of source code must retain the above copyright
13483 * notice, this list of conditions and the following disclaimer.
13484 * 2. Redistributions in binary form must reproduce the above copyright
13485 * notice, this list of conditions and the following disclaimer in the
13486 * documentation and/or other materials provided with the distribution.
13487 * 3. Neither the name of the University nor the names of its contributors
13488 * may be used to endorse or promote products derived from this software
13489 * without specific prior written permission.
13491 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
13492 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
13493 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
13494 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
13495 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
13496 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
13497 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
13498 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
13499 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
13500 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF