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 other routines
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.
4664 for (tp = trap; tp < &trap[NSIG]; tp++) {
4665 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 /* jp and n are NULL when called by openhere() for heredoc support */
4683 static NOINLINE void
4684 forkchild(struct job *jp, union node *n, int mode)
4688 TRACE(("Child shell %d\n", getpid()));
4692 /* man bash: "Non-builtin commands run by bash have signal handlers
4693 * set to the values inherited by the shell from its parent".
4694 * Do we do it correctly? */
4698 if (mode == FORK_NOJOB /* is it `xxx` ? */
4699 && n && n->type == NCMD /* is it single cmd? */
4700 /* && n->ncmd.args->type == NARG - always true? */
4701 && n->ncmd.args && strcmp(n->ncmd.args->narg.text, "trap") == 0
4702 && n->ncmd.args->narg.next == NULL /* "trap" with no arguments */
4703 /* && n->ncmd.args->narg.backquote == NULL - do we need to check this? */
4705 TRACE(("Trap hack\n"));
4706 /* Awful hack for `trap` or $(trap).
4708 * http://www.opengroup.org/onlinepubs/009695399/utilities/trap.html
4709 * contains an example where "trap" is executed in a subshell:
4711 * save_traps=$(trap)
4713 * eval "$save_traps"
4715 * Standard does not say that "trap" in subshell shall print
4716 * parent shell's traps. It only says that its output
4717 * must have suitable form, but then, in the above example
4718 * (which is not supposed to be normative), it implies that.
4720 * bash (and probably other shell) does implement it
4721 * (traps are reset to defaults, but "trap" still shows them),
4722 * but as a result, "trap" logic is hopelessly messed up:
4725 * trap -- 'echo Ho' SIGWINCH <--- we have a handler
4726 * # (trap) <--- trap is in subshell - no output (correct, traps are reset)
4727 * # true | trap <--- trap is in subshell - no output (ditto)
4728 * # echo `true | trap` <--- in subshell - output (but traps are reset!)
4729 * trap -- 'echo Ho' SIGWINCH
4730 * # echo `(trap)` <--- in subshell in subshell - output
4731 * trap -- 'echo Ho' SIGWINCH
4732 * # echo `true | (trap)` <--- in subshell in subshell in subshell - output!
4733 * trap -- 'echo Ho' SIGWINCH
4735 * The rules when to forget and when to not forget traps
4736 * get really complex and nonsensical.
4738 * Our solution: ONLY bare $(trap) or `trap` is special.
4740 /* Save trap handler strings for trap builtin to print */
4741 trap_ptr = xmemdup(trap, sizeof(trap));
4742 /* Fall through into clearing traps */
4746 /* do job control only in root shell */
4748 if (mode != FORK_NOJOB && jp->jobctl && oldlvl == 0) {
4751 if (jp->nprocs == 0)
4754 pgrp = jp->ps[0].ps_pid;
4755 /* this can fail because we are doing it in the parent also */
4757 if (mode == FORK_FG)
4758 xtcsetpgrp(ttyfd, pgrp);
4763 if (mode == FORK_BG) {
4764 /* man bash: "When job control is not in effect,
4765 * asynchronous commands ignore SIGINT and SIGQUIT" */
4768 if (jp->nprocs == 0) {
4770 if (open(bb_dev_null, O_RDONLY) != 0)
4771 ash_msg_and_raise_error("can't open '%s'", bb_dev_null);
4775 if (iflag) { /* why if iflag only? */
4780 * "In all cases, bash ignores SIGQUIT. Non-builtin
4781 * commands run by bash have signal handlers
4782 * set to the values inherited by the shell
4784 * Take care of the second rule: */
4788 if (n && n->type == NCMD
4789 && n->ncmd.args && strcmp(n->ncmd.args->narg.text, "jobs") == 0
4791 TRACE(("Job hack\n"));
4792 /* "jobs": we do not want to clear job list for it,
4793 * instead we remove only _its_ own_ job from job list.
4794 * This makes "jobs .... | cat" more useful.
4800 for (jp = curjob; jp; jp = jp->prev_job)
4805 /* Called after fork(), in parent */
4807 #define forkparent(jp, n, mode, pid) forkparent(jp, mode, pid)
4810 forkparent(struct job *jp, union node *n, int mode, pid_t pid)
4812 TRACE(("In parent shell: child = %d\n", pid));
4814 /* jp is NULL when called by openhere() for heredoc support */
4815 while (jobless && dowait(DOWAIT_NONBLOCK, NULL) > 0)
4821 if (mode != FORK_NOJOB && jp->jobctl) {
4824 if (jp->nprocs == 0)
4827 pgrp = jp->ps[0].ps_pid;
4828 /* This can fail because we are doing it in the child also */
4832 if (mode == FORK_BG) {
4833 backgndpid = pid; /* set $! */
4834 set_curjob(jp, CUR_RUNNING);
4837 struct procstat *ps = &jp->ps[jp->nprocs++];
4840 ps->ps_cmd = nullstr;
4842 if (doing_jobctl && n)
4843 ps->ps_cmd = commandtext(n);
4848 /* jp and n are NULL when called by openhere() for heredoc support */
4850 forkshell(struct job *jp, union node *n, int mode)
4854 TRACE(("forkshell(%%%d, %p, %d) called\n", jobno(jp), n, mode));
4857 TRACE(("Fork failed, errno=%d", errno));
4860 ash_msg_and_raise_error("can't fork");
4863 CLEAR_RANDOM_T(&random_gen); /* or else $RANDOM repeats in child */
4864 forkchild(jp, n, mode);
4866 forkparent(jp, n, mode, pid);
4872 * Wait for job to finish.
4874 * Under job control we have the problem that while a child process
4875 * is running interrupts generated by the user are sent to the child
4876 * but not to the shell. This means that an infinite loop started by
4877 * an interactive user may be hard to kill. With job control turned off,
4878 * an interactive user may place an interactive program inside a loop.
4879 * If the interactive program catches interrupts, the user doesn't want
4880 * these interrupts to also abort the loop. The approach we take here
4881 * is to have the shell ignore interrupt signals while waiting for a
4882 * foreground process to terminate, and then send itself an interrupt
4883 * signal if the child process was terminated by an interrupt signal.
4884 * Unfortunately, some programs want to do a bit of cleanup and then
4885 * exit on interrupt; unless these processes terminate themselves by
4886 * sending a signal to themselves (instead of calling exit) they will
4887 * confuse this approach.
4889 * Called with interrupts off.
4892 waitforjob(struct job *jp)
4896 TRACE(("waitforjob(%%%d) called\n", jobno(jp)));
4899 while (jp->state == JOBRUNNING) {
4900 /* In non-interactive shells, we _can_ get
4901 * a keyboard signal here and be EINTRed,
4902 * but we just loop back, waiting for command to complete.
4905 * "If bash is waiting for a command to complete and receives
4906 * a signal for which a trap has been set, the trap
4907 * will not be executed until the command completes."
4909 * Reality is that even if trap is not set, bash
4910 * will not act on the signal until command completes.
4911 * Try this. sleep5intoff.c:
4912 * #include <signal.h>
4913 * #include <unistd.h>
4916 * sigemptyset(&set);
4917 * sigaddset(&set, SIGINT);
4918 * sigaddset(&set, SIGQUIT);
4919 * sigprocmask(SIG_BLOCK, &set, NULL);
4923 * $ bash -c './sleep5intoff; echo hi'
4924 * ^C^C^C^C <--- pressing ^C once a second
4926 * $ bash -c './sleep5intoff; echo hi'
4927 * ^\^\^\^\hi <--- pressing ^\ (SIGQUIT)
4930 dowait(DOWAIT_BLOCK, jp);
4937 xtcsetpgrp(ttyfd, rootpid);
4939 * This is truly gross.
4940 * If we're doing job control, then we did a TIOCSPGRP which
4941 * caused us (the shell) to no longer be in the controlling
4942 * session -- so we wouldn't have seen any ^C/SIGINT. So, we
4943 * intuit from the subprocess exit status whether a SIGINT
4944 * occurred, and if so interrupt ourselves. Yuck. - mycroft
4946 if (jp->sigint) /* TODO: do the same with all signals */
4947 raise(SIGINT); /* ... by raise(jp->sig) instead? */
4949 if (jp->state == JOBDONE)
4956 * return 1 if there are stopped jobs, otherwise 0
4968 if (jp && jp->state == JOBSTOPPED) {
4969 out2str("You have stopped jobs.\n");
4979 * Code for dealing with input/output redirection.
4984 #define EMPTY -2 /* marks an unused slot in redirtab */
4985 #define CLOSED -3 /* marks a slot of previously-closed fd */
4988 * Open a file in noclobber mode.
4989 * The code was copied from bash.
4992 noclobberopen(const char *fname)
4995 struct stat finfo, finfo2;
4998 * If the file exists and is a regular file, return an error
5001 r = stat(fname, &finfo);
5002 if (r == 0 && S_ISREG(finfo.st_mode)) {
5008 * If the file was not present (r != 0), make sure we open it
5009 * exclusively so that if it is created before we open it, our open
5010 * will fail. Make sure that we do not truncate an existing file.
5011 * Note that we don't turn on O_EXCL unless the stat failed -- if the
5012 * file was not a regular file, we leave O_EXCL off.
5015 return open(fname, O_WRONLY|O_CREAT|O_EXCL, 0666);
5016 fd = open(fname, O_WRONLY|O_CREAT, 0666);
5018 /* If the open failed, return the file descriptor right away. */
5023 * OK, the open succeeded, but the file may have been changed from a
5024 * non-regular file to a regular file between the stat and the open.
5025 * We are assuming that the O_EXCL open handles the case where FILENAME
5026 * did not exist and is symlinked to an existing file between the stat
5031 * If we can open it and fstat the file descriptor, and neither check
5032 * revealed that it was a regular file, and the file has not been
5033 * replaced, return the file descriptor.
5035 if (fstat(fd, &finfo2) == 0
5036 && !S_ISREG(finfo2.st_mode)
5037 && finfo.st_dev == finfo2.st_dev
5038 && finfo.st_ino == finfo2.st_ino
5043 /* The file has been replaced. badness. */
5050 * Handle here documents. Normally we fork off a process to write the
5051 * data to a pipe. If the document is short, we can stuff the data in
5052 * the pipe without forking.
5054 /* openhere needs this forward reference */
5055 static void expandhere(union node *arg, int fd);
5057 openhere(union node *redir)
5063 ash_msg_and_raise_error("pipe call failed");
5064 if (redir->type == NHERE) {
5065 len = strlen(redir->nhere.doc->narg.text);
5066 if (len <= PIPE_BUF) {
5067 full_write(pip[1], redir->nhere.doc->narg.text, len);
5071 if (forkshell((struct job *)NULL, (union node *)NULL, FORK_NOJOB) == 0) {
5074 ignoresig(SIGINT); //signal(SIGINT, SIG_IGN);
5075 ignoresig(SIGQUIT); //signal(SIGQUIT, SIG_IGN);
5076 ignoresig(SIGHUP); //signal(SIGHUP, SIG_IGN);
5077 ignoresig(SIGTSTP); //signal(SIGTSTP, SIG_IGN);
5078 signal(SIGPIPE, SIG_DFL);
5079 if (redir->type == NHERE)
5080 full_write(pip[1], redir->nhere.doc->narg.text, len);
5082 expandhere(redir->nhere.doc, pip[1]);
5083 _exit(EXIT_SUCCESS);
5091 openredirect(union node *redir)
5096 switch (redir->nfile.type) {
5097 /* Can't happen, our single caller does this itself */
5103 return openhere(redir);
5106 /* For N[X]HERE, reading redir->nfile.expfname would touch beyond
5107 * allocated space. Do it only when we know it is safe.
5109 fname = redir->nfile.expfname;
5111 switch (redir->nfile.type) {
5117 f = open(fname, O_RDONLY);
5122 f = open(fname, O_RDWR|O_CREAT, 0666);
5127 #if ENABLE_ASH_BASH_COMPAT
5130 /* Take care of noclobber mode. */
5132 f = noclobberopen(fname);
5139 f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666);
5144 f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666);
5152 ash_msg_and_raise_error("can't create %s: %s", fname, errmsg(errno, "nonexistent directory"));
5154 ash_msg_and_raise_error("can't open %s: %s", fname, errmsg(errno, "no such file"));
5158 * Copy a file descriptor to be >= 10. Throws exception on error.
5166 newfd = fcntl(from, F_DUPFD, 10);
5167 err = newfd < 0 ? errno : 0;
5170 ash_msg_and_raise_error("%d: %m", from);
5172 fcntl(newfd, F_SETFD, FD_CLOEXEC);
5178 dup2_or_raise(int from, int to)
5182 newfd = (from != to) ? dup2(from, to) : to;
5184 /* Happens when source fd is not open: try "echo >&99" */
5185 ash_msg_and_raise_error("%d: %m", from);
5190 /* Struct def and variable are moved down to the first usage site */
5195 struct redirtab *next;
5197 struct two_fd_t two_fd[];
5199 #define redirlist (G_var.redirlist)
5201 COPYFD_RESTORE = (int)~(INT_MAX),
5205 need_to_remember(struct redirtab *rp, int fd)
5209 if (!rp) /* remembering was not requested */
5212 for (i = 0; i < rp->pair_count; i++) {
5213 if (rp->two_fd[i].orig == fd) {
5214 /* already remembered */
5221 /* "hidden" fd is a fd used to read scripts, or a copy of such */
5223 is_hidden_fd(struct redirtab *rp, int fd)
5226 struct parsefile *pf;
5230 /* Check open scripts' fds */
5233 /* We skip pf_fd == 0 case because of the following case:
5234 * $ ash # running ash interactively
5236 * and in script.sh: "exec 9>&0".
5237 * Even though top-level pf_fd _is_ 0,
5238 * it's still ok to use it: "read" builtin uses it,
5239 * why should we cripple "exec" builtin?
5241 if (pf->pf_fd > 0 && fd == pf->pf_fd) {
5249 /* Check saved fds of redirects */
5250 fd |= COPYFD_RESTORE;
5251 for (i = 0; i < rp->pair_count; i++) {
5252 if (rp->two_fd[i].copy == fd) {
5260 * Process a list of redirection commands. If the REDIR_PUSH flag is set,
5261 * old file descriptors are stashed away so that the redirection can be
5262 * undone by calling popredir.
5264 /* flags passed to redirect */
5265 #define REDIR_PUSH 01 /* save previous values of file descriptors */
5266 #define REDIR_SAVEFD2 03 /* set preverrout */
5268 redirect(union node *redir, int flags)
5270 struct redirtab *sv;
5275 int copied_fd2 = -1;
5284 if (flags & REDIR_PUSH) {
5285 union node *tmp = redir;
5288 #if ENABLE_ASH_BASH_COMPAT
5289 if (tmp->nfile.type == NTO2)
5292 tmp = tmp->nfile.next;
5294 sv = ckmalloc(sizeof(*sv) + sv_pos * sizeof(sv->two_fd[0]));
5295 sv->next = redirlist;
5296 sv->pair_count = sv_pos;
5298 while (sv_pos > 0) {
5300 sv->two_fd[sv_pos].orig = sv->two_fd[sv_pos].copy = EMPTY;
5306 fd = redir->nfile.fd;
5307 if (redir->nfile.type == NTOFD || redir->nfile.type == NFROMFD) {
5308 right_fd = redir->ndup.dupfd;
5309 //bb_error_msg("doing %d > %d", fd, right_fd);
5310 /* redirect from/to same file descriptor? */
5313 /* "echo >&10" and 10 is a fd opened to a sh script? */
5314 if (is_hidden_fd(sv, right_fd)) {
5315 errno = EBADF; /* as if it is closed */
5316 ash_msg_and_raise_error("%d: %m", right_fd);
5320 newfd = openredirect(redir); /* always >= 0 */
5322 /* Descriptor wasn't open before redirect.
5323 * Mark it for close in the future */
5324 if (need_to_remember(sv, fd)) {
5325 goto remember_to_close;
5330 #if ENABLE_ASH_BASH_COMPAT
5333 if (need_to_remember(sv, fd)) {
5334 /* Copy old descriptor */
5335 /* Careful to not accidentally "save"
5336 * to the same fd as right side fd in N>&M */
5337 int minfd = right_fd < 10 ? 10 : right_fd + 1;
5338 i = fcntl(fd, F_DUPFD, minfd);
5339 /* You'd expect copy to be CLOEXECed. Currently these extra "saved" fds
5340 * are closed in popredir() in the child, preventing them from leaking
5341 * into child. (popredir() also cleans up the mess in case of failures)
5346 /* Strange error (e.g. "too many files" EMFILE?) */
5350 ash_msg_and_raise_error("%d: %m", fd);
5353 /* EBADF: it is not open - good, remember to close it */
5356 } else { /* fd is open, save its copy */
5357 /* "exec fd>&-" should not close fds
5358 * which point to script file(s).
5359 * Force them to be restored afterwards */
5360 if (is_hidden_fd(sv, fd))
5361 i |= COPYFD_RESTORE;
5365 sv->two_fd[sv_pos].orig = fd;
5366 sv->two_fd[sv_pos].copy = i;
5370 /* NTOFD/NFROMFD: copy redir->ndup.dupfd to fd */
5371 if (redir->ndup.dupfd < 0) { /* "fd>&-" */
5372 /* Don't want to trigger debugging */
5376 dup2_or_raise(redir->ndup.dupfd, fd);
5378 } else if (fd != newfd) { /* move newfd to fd */
5379 dup2_or_raise(newfd, fd);
5380 #if ENABLE_ASH_BASH_COMPAT
5381 if (!(redir->nfile.type == NTO2 && fd == 2))
5385 #if ENABLE_ASH_BASH_COMPAT
5386 if (redir->nfile.type == NTO2 && fd == 1) {
5387 /* We already redirected it to fd 1, now copy it to 2 */
5393 } while ((redir = redir->nfile.next) != NULL);
5396 if ((flags & REDIR_SAVEFD2) && copied_fd2 >= 0)
5397 preverrout_fd = copied_fd2;
5401 * Undo the effects of the last redirection.
5404 popredir(int drop, int restore)
5406 struct redirtab *rp;
5409 if (redirlist == NULL)
5413 for (i = 0; i < rp->pair_count; i++) {
5414 int fd = rp->two_fd[i].orig;
5415 int copy = rp->two_fd[i].copy;
5416 if (copy == CLOSED) {
5421 if (copy != EMPTY) {
5422 if (!drop || (restore && (copy & COPYFD_RESTORE))) {
5423 copy &= ~COPYFD_RESTORE;
5425 dup2_or_raise(copy, fd);
5427 close(copy & ~COPYFD_RESTORE);
5430 redirlist = rp->next;
5436 * Undo all redirections. Called on error or interrupt.
5440 redirectsafe(union node *redir, int flags)
5443 volatile int saveint;
5444 struct jmploc *volatile savehandler = exception_handler;
5445 struct jmploc jmploc;
5448 /* "echo 9>/dev/null; echo >&9; echo result: $?" - result should be 1, not 2! */
5449 err = setjmp(jmploc.loc); // huh?? was = setjmp(jmploc.loc) * 2;
5451 exception_handler = &jmploc;
5452 redirect(redir, flags);
5454 exception_handler = savehandler;
5455 if (err && exception_type != EXERROR)
5456 longjmp(exception_handler->loc, 1);
5457 RESTORE_INT(saveint);
5462 /* ============ Routines to expand arguments to commands
5464 * We have to deal with backquotes, shell variables, and file metacharacters.
5467 #if ENABLE_SH_MATH_SUPPORT
5469 ash_arith(const char *s)
5471 arith_state_t math_state;
5474 math_state.lookupvar = lookupvar;
5475 math_state.setvar = setvar0;
5476 //math_state.endofname = endofname;
5479 result = arith(&math_state, s);
5480 if (math_state.errmsg)
5481 ash_msg_and_raise_error(math_state.errmsg);
5491 #define EXP_FULL 0x1 /* perform word splitting & file globbing */
5492 #define EXP_TILDE 0x2 /* do normal tilde expansion */
5493 #define EXP_VARTILDE 0x4 /* expand tildes in an assignment */
5494 #define EXP_REDIR 0x8 /* file glob for a redirection (1 match only) */
5495 /* ^^^^^^^^^^^^^^ this is meant to support constructs such as "cmd >file*.txt"
5496 * POSIX says for this case:
5497 * Pathname expansion shall not be performed on the word by a
5498 * non-interactive shell; an interactive shell may perform it, but shall
5499 * do so only when the expansion would result in one word.
5500 * Currently, our code complies to the above rule by never globbing
5501 * redirection filenames.
5502 * Bash performs globbing, unless it is non-interactive and in POSIX mode.
5503 * (this means that on a typical Linux distro, bash almost always
5504 * performs globbing, and thus diverges from what we do).
5506 #define EXP_CASE 0x10 /* keeps quotes around for CASE pattern */
5507 #define EXP_QPAT 0x20 /* pattern in quoted parameter expansion */
5508 #define EXP_VARTILDE2 0x40 /* expand tildes after colons only */
5509 #define EXP_WORD 0x80 /* expand word in parameter expansion */
5510 #define EXP_QUOTED 0x100 /* expand word in double quotes */
5514 #define RMESCAPE_ALLOC 0x1 /* Allocate a new string */
5515 #define RMESCAPE_GLOB 0x2 /* Add backslashes for glob */
5516 #define RMESCAPE_GROW 0x8 /* Grow strings instead of stalloc */
5517 #define RMESCAPE_HEAP 0x10 /* Malloc strings instead of stalloc */
5518 #define RMESCAPE_SLASH 0x20 /* Stop globbing after slash */
5520 /* Add CTLESC when necessary. */
5521 #define QUOTES_ESC (EXP_FULL | EXP_CASE | EXP_QPAT | EXP_REDIR)
5522 /* Do not skip NUL characters. */
5523 #define QUOTES_KEEPNUL EXP_TILDE
5526 * Structure specifying which parts of the string should be searched
5527 * for IFS characters.
5530 struct ifsregion *next; /* next region in list */
5531 int begoff; /* offset of start of region */
5532 int endoff; /* offset of end of region */
5533 int nulonly; /* search for nul bytes only */
5537 struct strlist *list;
5538 struct strlist **lastp;
5541 /* output of current string */
5542 static char *expdest;
5543 /* list of back quote expressions */
5544 static struct nodelist *argbackq;
5545 /* first struct in list of ifs regions */
5546 static struct ifsregion ifsfirst;
5547 /* last struct in list */
5548 static struct ifsregion *ifslastp;
5549 /* holds expanded arg list */
5550 static struct arglist exparg;
5555 #if !ENABLE_SH_MATH_SUPPORT
5556 /* cvtnum() is used even if math support is off (to prepare $? values and such) */
5557 typedef long arith_t;
5558 # define ARITH_FMT "%ld"
5565 expdest = makestrspace(sizeof(arith_t)*3 + 2, expdest);
5566 len = fmtstr(expdest, sizeof(arith_t)*3 + 2, ARITH_FMT, num);
5567 STADJUST(len, expdest);
5572 esclen(const char *start, const char *p)
5576 while (p > start && (unsigned char)*--p == CTLESC) {
5583 * Remove any CTLESC characters from a string.
5586 rmescapes(char *str, int flag)
5588 static const char qchars[] ALIGN1 = {
5589 IF_ASH_BASH_COMPAT('/',) CTLESC, CTLQUOTEMARK, '\0' };
5593 unsigned protect_against_glob;
5595 IF_ASH_BASH_COMPAT(unsigned slash = flag & RMESCAPE_SLASH;)
5597 p = strpbrk(str, qchars IF_ASH_BASH_COMPAT(+ !slash));
5603 if (flag & RMESCAPE_ALLOC) {
5604 size_t len = p - str;
5605 size_t fulllen = len + strlen(p) + 1;
5607 if (flag & RMESCAPE_GROW) {
5608 int strloc = str - (char *)stackblock();
5609 r = makestrspace(fulllen, expdest);
5610 /* p and str may be invalidated by makestrspace */
5611 str = (char *)stackblock() + strloc;
5613 } else if (flag & RMESCAPE_HEAP) {
5614 r = ckmalloc(fulllen);
5616 r = stalloc(fulllen);
5620 q = (char *)memcpy(q, str, len) + len;
5625 globbing = flag & RMESCAPE_GLOB;
5626 protect_against_glob = globbing;
5628 if ((unsigned char)*p == CTLQUOTEMARK) {
5629 // Note: both inquotes and protect_against_glob only affect whether
5630 inquotes = ~inquotes;
5632 protect_against_glob = globbing;
5635 if ((unsigned char)*p == CTLESC) {
5639 ash_msg_and_raise_error("CTLESC at EOL (shouldn't happen)");
5641 if (protect_against_glob) {
5644 } else if (*p == '\\' && !inquotes) {
5645 /* naked back slash */
5646 protect_against_glob = 0;
5649 #if ENABLE_ASH_BASH_COMPAT
5650 else if (*p == '/' && slash) {
5651 /* stop handling globbing and mark location of slash */
5652 globbing = slash = 0;
5656 protect_against_glob = globbing;
5661 if (flag & RMESCAPE_GROW) {
5663 STADJUST(q - r + 1, expdest);
5667 #define pmatch(a, b) !fnmatch((a), (b), 0)
5670 * Prepare a pattern for a expmeta (internal glob(3)) call.
5672 * Returns an stalloced string.
5675 preglob(const char *pattern, int flag)
5677 return rmescapes((char *)pattern, flag | RMESCAPE_GLOB);
5681 * Put a string on the stack.
5684 memtodest(const char *p, size_t len, int syntax, int quotes)
5691 q = makestrspace((quotes & QUOTES_ESC) ? len * 2 : len, expdest);
5694 unsigned char c = *p++;
5696 int n = SIT(c, syntax);
5697 if ((quotes & QUOTES_ESC)
5699 || (((quotes & EXP_FULL) || syntax != BASESYNTAX)
5705 } else if (!(quotes & QUOTES_KEEPNUL))
5714 strtodest(const char *p, int syntax, int quotes)
5716 size_t len = strlen(p);
5717 memtodest(p, len, syntax, quotes);
5722 * Record the fact that we have to scan this region of the
5723 * string for IFS characters.
5726 recordregion(int start, int end, int nulonly)
5728 struct ifsregion *ifsp;
5730 if (ifslastp == NULL) {
5734 ifsp = ckzalloc(sizeof(*ifsp));
5735 /*ifsp->next = NULL; - ckzalloc did it */
5736 ifslastp->next = ifsp;
5740 ifslastp->begoff = start;
5741 ifslastp->endoff = end;
5742 ifslastp->nulonly = nulonly;
5746 removerecordregions(int endoff)
5748 if (ifslastp == NULL)
5751 if (ifsfirst.endoff > endoff) {
5752 while (ifsfirst.next) {
5753 struct ifsregion *ifsp;
5755 ifsp = ifsfirst.next->next;
5756 free(ifsfirst.next);
5757 ifsfirst.next = ifsp;
5760 if (ifsfirst.begoff > endoff) {
5763 ifslastp = &ifsfirst;
5764 ifsfirst.endoff = endoff;
5769 ifslastp = &ifsfirst;
5770 while (ifslastp->next && ifslastp->next->begoff < endoff)
5771 ifslastp = ifslastp->next;
5772 while (ifslastp->next) {
5773 struct ifsregion *ifsp;
5775 ifsp = ifslastp->next->next;
5776 free(ifslastp->next);
5777 ifslastp->next = ifsp;
5780 if (ifslastp->endoff > endoff)
5781 ifslastp->endoff = endoff;
5785 exptilde(char *startp, char *p, int flags)
5791 int quotes = flags & QUOTES_ESC;
5795 while ((c = *++p) != '\0') {
5802 if (flags & EXP_VARTILDE)
5812 if (*name == '\0') {
5813 home = lookupvar("HOME");
5815 pw = getpwnam(name);
5820 if (!home || !*home)
5823 strtodest(home, SQSYNTAX, quotes);
5831 * Execute a command inside back quotes. If it's a builtin command, we
5832 * want to save its output in a block obtained from malloc. Otherwise
5833 * we fork off a subprocess and get the output of the command via a pipe.
5834 * Should be called with interrupts off.
5836 struct backcmd { /* result of evalbackcmd */
5837 int fd; /* file descriptor to read from */
5838 int nleft; /* number of chars in buffer */
5839 char *buf; /* buffer */
5840 struct job *jp; /* job structure for command */
5843 /* These forward decls are needed to use "eval" code for backticks handling: */
5844 #define EV_EXIT 01 /* exit after evaluating tree */
5845 static int evaltree(union node *, int);
5847 static void FAST_FUNC
5848 evalbackcmd(union node *n, struct backcmd *result)
5862 ash_msg_and_raise_error("pipe call failed");
5863 jp = makejob(/*n,*/ 1);
5864 if (forkshell(jp, n, FORK_NOJOB) == 0) {
5870 dup2_or_raise(pip[1], 1);
5873 /* TODO: eflag clearing makes the following not abort:
5874 * ash -c 'set -e; z=$(false;echo foo); echo $z'
5875 * which is what bash does (unless it is in POSIX mode).
5876 * dash deleted "eflag = 0" line in the commit
5877 * Date: Mon, 28 Jun 2010 17:11:58 +1000
5878 * [EVAL] Don't clear eflag in evalbackcmd
5879 * For now, preserve bash-like behavior, it seems to be somewhat more useful:
5882 evaltree(n, EV_EXIT); /* actually evaltreenr... */
5887 result->fd = pip[0];
5891 TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n",
5892 result->fd, result->buf, result->nleft, result->jp));
5896 * Expand stuff in backwards quotes.
5899 expbackq(union node *cmd, int flag)
5907 int syntax = flag & EXP_QUOTED ? DQSYNTAX : BASESYNTAX;
5908 struct stackmark smark;
5911 startloc = expdest - (char *)stackblock();
5912 pushstackmark(&smark, startloc);
5913 evalbackcmd(cmd, &in);
5914 popstackmark(&smark);
5921 memtodest(p, i, syntax, flag & QUOTES_ESC);
5925 i = nonblock_immune_read(in.fd, buf, sizeof(buf));
5926 TRACE(("expbackq: read returns %d\n", i));
5935 back_exitstatus = waitforjob(in.jp);
5939 /* Eat all trailing newlines */
5941 for (; dest > (char *)stackblock() && dest[-1] == '\n';)
5945 if (!(flag & EXP_QUOTED))
5946 recordregion(startloc, dest - (char *)stackblock(), 0);
5947 TRACE(("evalbackq: size:%d:'%.*s'\n",
5948 (int)((dest - (char *)stackblock()) - startloc),
5949 (int)((dest - (char *)stackblock()) - startloc),
5950 stackblock() + startloc));
5953 #if ENABLE_SH_MATH_SUPPORT
5955 * Expand arithmetic expression. Backup to start of expression,
5956 * evaluate, place result in (backed up) result, adjust string position.
5968 * This routine is slightly over-complicated for
5969 * efficiency. Next we scan backwards looking for the
5970 * start of arithmetic.
5972 start = stackblock();
5979 while ((unsigned char)*p != CTLARI) {
5983 ash_msg_and_raise_error("missing CTLARI (shouldn't happen)");
5988 esc = esclen(start, p);
5998 removerecordregions(begoff);
6002 if (flag & QUOTES_ESC)
6003 rmescapes(p + 1, 0);
6005 len = cvtnum(ash_arith(p + 1));
6007 if (!(flag & EXP_QUOTED))
6008 recordregion(begoff, begoff + len, 0);
6012 /* argstr needs it */
6013 static char *evalvar(char *p, int flags, struct strlist *var_str_list);
6016 * Perform variable and command substitution. If EXP_FULL is set, output CTLESC
6017 * characters to allow for further processing. Otherwise treat
6018 * $@ like $* since no splitting will be performed.
6020 * var_str_list (can be NULL) is a list of "VAR=val" strings which take precedence
6021 * over shell varables. Needed for "A=a B=$A; echo $B" case - we use it
6022 * for correct expansion of "B=$A" word.
6025 argstr(char *p, int flags, struct strlist *var_str_list)
6027 static const char spclchars[] ALIGN1 = {
6035 #if ENABLE_SH_MATH_SUPPORT
6040 const char *reject = spclchars;
6041 int breakall = (flags & (EXP_WORD | EXP_QUOTED)) == EXP_WORD;
6046 if (!(flags & EXP_VARTILDE)) {
6048 } else if (flags & EXP_VARTILDE2) {
6053 if (flags & EXP_TILDE) {
6056 flags &= ~EXP_TILDE;
6060 p = exptilde(p, q, flags);
6063 startloc = expdest - (char *)stackblock();
6067 length += strcspn(p + length, reject);
6071 IF_SH_MATH_SUPPORT(|| c == CTLENDARI)
6073 /* c == '=' || c == ':' || c == CTLENDARI */
6079 expdest = stack_nputstr(p, length, expdest);
6080 newloc = expdest - (char *)stackblock();
6081 if (breakall && !inquotes && newloc > startloc) {
6082 recordregion(startloc, newloc, 0);
6093 if (flags & EXP_VARTILDE2) {
6097 flags |= EXP_VARTILDE2;
6102 * sort of a hack - expand tildes in variable
6103 * assignments (after the first '=' and after ':'s).
6112 case CTLENDVAR: /* ??? */
6115 inquotes ^= EXP_QUOTED;
6116 /* "$@" syntax adherence hack */
6117 if (inquotes && !memcmp(p, dolatstr + 1, DOLATSTRLEN - 1)) {
6118 p = evalvar(p + 1, flags | inquotes, /* var_str_list: */ NULL) + 1;
6122 if (flags & QUOTES_ESC) {
6133 * Quoted parameter expansion pattern: remove quote
6134 * unless inside inner quotes or we have a literal
6137 if (((flags | inquotes) & (EXP_QPAT | EXP_QUOTED)) ==
6138 EXP_QPAT && *p != '\\')
6143 TRACE(("argstr: evalvar('%s')\n", p));
6144 p = evalvar(p, flags | inquotes, var_str_list);
6145 TRACE(("argstr: evalvar:'%s'\n", (char *)stackblock()));
6148 expbackq(argbackq->n, flags | inquotes);
6149 argbackq = argbackq->next;
6151 #if ENABLE_SH_MATH_SUPPORT
6154 expari(flags | inquotes);
6163 scanleft(char *startp, char *rmesc, char *rmescend UNUSED_PARAM,
6164 char *pattern, int quotes, int zero)
6173 const char *s = loc2;
6180 match = pmatch(pattern, s);
6185 if (quotes && (unsigned char)*loc == CTLESC)
6194 scanright(char *startp, char *rmesc, char *rmescend,
6195 char *pattern, int quotes, int match_at_start)
6197 #if !ENABLE_ASH_OPTIMIZE_FOR_SIZE
6198 int try2optimize = match_at_start;
6204 /* If we called by "${v/pattern/repl}" or "${v//pattern/repl}":
6205 * startp="escaped_value_of_v" rmesc="raw_value_of_v"
6206 * rmescend=""(ptr to NUL in rmesc) pattern="pattern" quotes=match_at_start=1
6208 * loc starts at NUL at the end of startp, loc2 starts at the end of rmesc,
6209 * and on each iteration they go back two/one char until they reach the beginning.
6210 * We try to find a match in "raw_value_of_v", "raw_value_of_", "raw_value_of" etc.
6212 /* TODO: document in what other circumstances we are called. */
6214 for (loc = pattern - 1, loc2 = rmescend; loc >= startp; loc2--) {
6217 const char *s = loc2;
6218 if (match_at_start) {
6222 match = pmatch(pattern, s);
6223 //bb_error_msg("pmatch(pattern:'%s',s:'%s'):%d", pattern, s, match);
6227 #if !ENABLE_ASH_OPTIMIZE_FOR_SIZE
6229 /* Maybe we can optimize this:
6230 * if pattern ends with unescaped *, we can avoid checking
6231 * shorter strings: if "foo*" doesnt match "raw_value_of_v",
6232 * it wont match truncated "raw_value_of_" strings too.
6234 unsigned plen = strlen(pattern);
6235 /* Does it end with "*"? */
6236 if (plen != 0 && pattern[--plen] == '*') {
6237 /* "xxxx*" is not escaped */
6238 /* "xxx\*" is escaped */
6239 /* "xx\\*" is not escaped */
6240 /* "x\\\*" is escaped */
6242 while (plen != 0 && pattern[--plen] == '\\')
6245 break; /* ends with unescaped "*" */
6253 esc = esclen(startp, loc);
6264 static void varunset(const char *, const char *, const char *, int) NORETURN;
6266 varunset(const char *end, const char *var, const char *umsg, int varflags)
6272 msg = "parameter not set";
6274 if ((unsigned char)*end == CTLENDVAR) {
6275 if (varflags & VSNUL)
6281 ash_msg_and_raise_error("%.*s: %s%s", (int)(end - var - 1), var, msg, tail);
6285 subevalvar(char *p, char *varname, int strloc, int subtype,
6286 int startloc, int varflags, int flag, struct strlist *var_str_list)
6288 struct nodelist *saveargbackq = argbackq;
6289 int quotes = flag & QUOTES_ESC;
6292 char *rmesc, *rmescend;
6294 IF_ASH_BASH_COMPAT(char *repl = NULL;)
6295 IF_ASH_BASH_COMPAT(int pos, len, orig_len;)
6296 int amount, resetloc;
6297 IF_ASH_BASH_COMPAT(int workloc;)
6299 char *(*scan)(char*, char*, char*, char*, int, int);
6301 //bb_error_msg("subevalvar(p:'%s',varname:'%s',strloc:%d,subtype:%d,startloc:%d,varflags:%x,quotes:%d)",
6302 // p, varname, strloc, subtype, startloc, varflags, quotes);
6304 argstr(p, EXP_TILDE | (subtype != VSASSIGN && subtype != VSQUESTION ?
6305 (flag & (EXP_QUOTED | EXP_QPAT) ? EXP_QPAT : EXP_CASE) : 0),
6307 STPUTC('\0', expdest);
6308 argbackq = saveargbackq;
6309 startp = (char *)stackblock() + startloc;
6313 setvar0(varname, startp);
6314 amount = startp - expdest;
6315 STADJUST(amount, expdest);
6319 varunset(p, varname, startp, varflags);
6322 #if ENABLE_ASH_BASH_COMPAT
6324 //TODO: support more general format ${v:EXPR:EXPR},
6325 // where EXPR follows $(()) rules
6326 loc = str = stackblock() + strloc;
6327 /* Read POS in ${var:POS:LEN} */
6328 pos = atoi(loc); /* number(loc) errors out on "1:4" */
6329 len = str - startp - 1;
6331 /* *loc != '\0', guaranteed by parser */
6335 /* Adjust the length by the number of escapes */
6336 for (ptr = startp; ptr < (str - 1); ptr++) {
6337 if ((unsigned char)*ptr == CTLESC) {
6345 if (*loc++ == ':') {
6349 /* Skip POS in ${var:POS:LEN} */
6351 while (*loc && *loc != ':') {
6353 * bash complains on: var=qwe; echo ${var:1a:123}
6355 ash_msg_and_raise_error(msg_illnum, str);
6359 if (*loc++ == ':') {
6364 /* ${VAR:$((-n)):l} starts n chars from the end */
6365 pos = orig_len + pos;
6367 if ((unsigned)pos >= orig_len) {
6368 /* apart from obvious ${VAR:999999:l},
6369 * covers ${VAR:$((-9999999)):l} - result is ""
6375 if (len > (orig_len - pos))
6376 len = orig_len - pos;
6378 for (str = startp; pos; str++, pos--) {
6379 if (quotes && (unsigned char)*str == CTLESC)
6382 for (loc = startp; len; len--) {
6383 if (quotes && (unsigned char)*str == CTLESC)
6388 amount = loc - expdest;
6389 STADJUST(amount, expdest);
6394 resetloc = expdest - (char *)stackblock();
6396 /* We'll comeback here if we grow the stack while handling
6397 * a VSREPLACE or VSREPLACEALL, since our pointers into the
6398 * stack will need rebasing, and we'll need to remove our work
6401 IF_ASH_BASH_COMPAT(restart:)
6403 amount = expdest - ((char *)stackblock() + resetloc);
6404 STADJUST(-amount, expdest);
6405 startp = (char *)stackblock() + startloc;
6408 rmescend = (char *)stackblock() + strloc;
6410 rmesc = rmescapes(startp, RMESCAPE_ALLOC | RMESCAPE_GROW);
6411 if (rmesc != startp) {
6413 startp = (char *)stackblock() + startloc;
6417 str = (char *)stackblock() + strloc;
6419 * Example: v='a\bc'; echo ${v/\\b/_\\_\z_}
6420 * The result is a_\_z_c (not a\_\_z_c)!
6422 * The search pattern and replace string treat backslashes differently!
6423 * RMESCAPE_SLASH causes preglob to work differently on the pattern
6424 * and string. It's only used on the first call.
6426 preglob(str, IF_ASH_BASH_COMPAT(
6427 (subtype == VSREPLACE || subtype == VSREPLACEALL) && !repl ?
6428 RMESCAPE_SLASH :) 0);
6430 #if ENABLE_ASH_BASH_COMPAT
6431 workloc = expdest - (char *)stackblock();
6432 if (subtype == VSREPLACE || subtype == VSREPLACEALL) {
6436 repl = strchr(str, CTLESC);
6442 //bb_error_msg("str:'%s' repl:'%s'", str, repl);
6444 /* If there's no pattern to match, return the expansion unmolested */
6453 loc = scanright(idx, rmesc, rmescend, str, quotes, 1);
6454 //bb_error_msg("scanright('%s'):'%s'", str, loc);
6456 /* No match, advance */
6457 char *restart_detect = stackblock();
6459 STPUTC(*idx, expdest);
6460 if (quotes && (unsigned char)*idx == CTLESC) {
6463 STPUTC(*idx, expdest);
6465 if (stackblock() != restart_detect)
6470 /* continue; - prone to quadratic behavior, smarter code: */
6473 if (str[0] == '*') {
6474 /* Pattern is "*foo". If "*foo" does not match "long_string",
6475 * it would never match "ong_string" etc, no point in trying.
6482 if (subtype == VSREPLACEALL) {
6484 if (quotes && (unsigned char)*idx == CTLESC)
6493 //bb_error_msg("repl:'%s'", repl);
6494 for (loc = (char*)repl; *loc; loc++) {
6495 char *restart_detect = stackblock();
6496 if (quotes && *loc == '\\') {
6497 STPUTC(CTLESC, expdest);
6500 STPUTC(*loc, expdest);
6501 if (stackblock() != restart_detect)
6506 if (subtype == VSREPLACE) {
6507 //bb_error_msg("tail:'%s', quotes:%x", idx, quotes);
6509 char *restart_detect = stackblock();
6510 STPUTC(*idx, expdest);
6511 if (stackblock() != restart_detect)
6520 /* We've put the replaced text into a buffer at workloc, now
6521 * move it to the right place and adjust the stack.
6523 STPUTC('\0', expdest);
6524 startp = (char *)stackblock() + startloc;
6525 memmove(startp, (char *)stackblock() + workloc, len + 1);
6526 //bb_error_msg("startp:'%s'", startp);
6527 amount = expdest - (startp + len);
6528 STADJUST(-amount, expdest);
6531 #endif /* ENABLE_ASH_BASH_COMPAT */
6533 subtype -= VSTRIMRIGHT;
6535 if (subtype < 0 || subtype > 7)
6538 /* zero = (subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX) */
6539 zero = subtype >> 1;
6540 /* VSTRIMLEFT/VSTRIMRIGHTMAX -> scanleft */
6541 scan = (subtype & 1) ^ zero ? scanleft : scanright;
6543 loc = scan(startp, rmesc, rmescend, str, quotes, zero);
6546 memmove(startp, loc, str - loc);
6547 loc = startp + (str - loc) - 1;
6550 amount = loc - expdest;
6551 STADJUST(amount, expdest);
6557 * Add the value of a specialized variable to the stack string.
6558 * name parameter (examples):
6559 * ash -c 'echo $1' name:'1='
6560 * ash -c 'echo $qwe' name:'qwe='
6561 * ash -c 'echo $$' name:'$='
6562 * ash -c 'echo ${$}' name:'$='
6563 * ash -c 'echo ${$##q}' name:'$=q'
6564 * ash -c 'echo ${#$}' name:'$='
6565 * note: examples with bad shell syntax:
6566 * ash -c 'echo ${#$1}' name:'$=1'
6567 * ash -c 'echo ${#1#}' name:'1=#'
6569 static NOINLINE ssize_t
6570 varvalue(char *name, int varflags, int flags, struct strlist *var_str_list, int *quotedp)
6577 int quoted = *quotedp;
6578 int subtype = varflags & VSTYPE;
6579 int discard = subtype == VSPLUS || subtype == VSLENGTH;
6580 int quotes = (discard ? 0 : (flags & QUOTES_ESC)) | QUOTES_KEEPNUL;
6583 sep = (flags & EXP_FULL) << CHAR_BIT;
6584 syntax = quoted ? DQSYNTAX : BASESYNTAX;
6594 num = shellparam.nparam;
6602 goto check_1char_name;
6604 expdest = makestrspace(NOPTS, expdest);
6605 for (i = NOPTS - 1; i >= 0; i--) {
6607 USTPUTC(optletters(i), expdest);
6613 /* handles cases similar to ${#$1} */
6614 if (name[2] != '\0')
6615 raise_error_syntax("bad substitution");
6628 sep |= ifsset() ? ifsval()[0] : ' ';
6635 while ((p = *ap++) != NULL) {
6636 len += strtodest(p, syntax, quotes);
6640 memtodest(&sepc, 1, syntax, quotes);
6655 num = atoi(name); /* number(name) fails on ${N#str} etc */
6656 if (num < 0 || num > shellparam.nparam)
6658 p = num ? shellparam.p[num - 1] : arg0;
6661 /* NB: name has form "VAR=..." */
6663 /* "A=a B=$A" case: var_str_list is a list of "A=a" strings
6664 * which should be considered before we check variables. */
6666 unsigned name_len = (strchrnul(name, '=') - name) + 1;
6670 str = var_str_list->text;
6671 eq = strchr(str, '=');
6672 if (!eq) /* stop at first non-assignment */
6675 if (name_len == (unsigned)(eq - str)
6676 && strncmp(str, name, name_len) == 0
6679 /* goto value; - WRONG! */
6680 /* think "A=1 A=2 B=$A" */
6682 var_str_list = var_str_list->next;
6683 } while (var_str_list);
6687 p = lookupvar(name);
6692 len = strtodest(p, syntax, quotes);
6693 #if ENABLE_UNICODE_SUPPORT
6694 if (subtype == VSLENGTH && len > 0) {
6695 reinit_unicode_for_ash();
6696 if (unicode_status == UNICODE_ON) {
6697 STADJUST(-len, expdest);
6699 len = unicode_strlen(p);
6707 STADJUST(-len, expdest);
6712 * Expand a variable, and return a pointer to the next character in the
6716 evalvar(char *p, int flag, struct strlist *var_str_list)
6727 varflags = (unsigned char) *p++;
6728 subtype = varflags & VSTYPE;
6731 raise_error_syntax("bad substitution");
6733 quoted = flag & EXP_QUOTED;
6735 easy = (!quoted || (*var == '@' && shellparam.nparam));
6736 startloc = expdest - (char *)stackblock();
6737 p = strchr(p, '=') + 1; //TODO: use var_end(p)?
6740 varlen = varvalue(var, varflags, flag, var_str_list, "ed);
6741 if (varflags & VSNUL)
6744 if (subtype == VSPLUS) {
6745 varlen = -1 - varlen;
6749 if (subtype == VSMINUS) {
6754 flag | EXP_TILDE | EXP_WORD,
6762 if (subtype == VSASSIGN || subtype == VSQUESTION) {
6766 subevalvar(p, var, 0, subtype, startloc, varflags,
6767 flag & ~QUOTES_ESC, var_str_list);
6770 * Remove any recorded regions beyond
6773 removerecordregions(startloc);
6777 if (varlen < 0 && uflag)
6778 varunset(p, var, 0, 0);
6780 if (subtype == VSLENGTH) {
6781 cvtnum(varlen > 0 ? varlen : 0);
6785 if (subtype == VSNORMAL) {
6789 recordregion(startloc, expdest - (char *)stackblock(), quoted);
6798 case VSTRIMRIGHTMAX:
6799 #if ENABLE_ASH_BASH_COMPAT
6812 * Terminate the string and start recording the pattern
6815 STPUTC('\0', expdest);
6816 patloc = expdest - (char *)stackblock();
6817 if (NULL == subevalvar(p, /* varname: */ NULL, patloc, subtype,
6818 startloc, varflags, flag, var_str_list)) {
6819 int amount = expdest - (
6820 (char *)stackblock() + patloc - 1
6822 STADJUST(-amount, expdest);
6824 /* Remove any recorded regions beyond start of variable */
6825 removerecordregions(startloc);
6830 if (subtype != VSNORMAL) { /* skip to end of alternative */
6833 unsigned char c = *p++;
6836 else if (c == CTLBACKQ) {
6838 argbackq = argbackq->next;
6839 } else if (c == CTLVAR) {
6840 if ((*p++ & VSTYPE) != VSNORMAL)
6842 } else if (c == CTLENDVAR) {
6852 * Break the argument string into pieces based upon IFS and add the
6853 * strings to the argument list. The regions of the string to be
6854 * searched for IFS characters have been stored by recordregion.
6857 ifsbreakup(char *string, struct arglist *arglist)
6859 struct ifsregion *ifsp;
6864 const char *ifs, *realifs;
6869 if (ifslastp != NULL) {
6872 realifs = ifsset() ? ifsval() : defifs;
6875 p = string + ifsp->begoff;
6876 nulonly = ifsp->nulonly;
6877 ifs = nulonly ? nullstr : realifs;
6879 while (p < string + ifsp->endoff) {
6881 if ((unsigned char)*p == CTLESC)
6883 if (!strchr(ifs, *p)) {
6888 ifsspc = (strchr(defifs, *p) != NULL);
6889 /* Ignore IFS whitespace at start */
6890 if (q == start && ifsspc) {
6896 sp = stzalloc(sizeof(*sp));
6898 *arglist->lastp = sp;
6899 arglist->lastp = &sp->next;
6903 if (p >= string + ifsp->endoff) {
6907 if ((unsigned char)*p == CTLESC)
6909 if (strchr(ifs, *p) == NULL) {
6913 if (strchr(defifs, *p) == NULL) {
6928 } while (ifsp != NULL);
6937 sp = stzalloc(sizeof(*sp));
6939 *arglist->lastp = sp;
6940 arglist->lastp = &sp->next;
6946 struct ifsregion *p;
6951 struct ifsregion *ifsp;
6957 ifsfirst.next = NULL;
6962 * Add a file name to the list.
6965 addfname(const char *name)
6969 sp = stzalloc(sizeof(*sp));
6970 sp->text = sstrdup(name);
6972 exparg.lastp = &sp->next;
6975 /* If we want to use glob() from libc... */
6976 #if !ENABLE_ASH_INTERNAL_GLOB
6978 /* Add the result of glob() to the list */
6980 addglob(const glob_t *pglob)
6982 char **p = pglob->gl_pathv;
6989 expandmeta(struct strlist *str /*, int flag*/)
6991 /* TODO - EXP_REDIR */
7001 p = preglob(str->text, RMESCAPE_ALLOC | RMESCAPE_HEAP);
7002 // GLOB_NOMAGIC (GNU): if no *?[ chars in pattern, return it even if no match
7003 // GLOB_NOCHECK: if no match, return unchanged pattern (sans \* escapes?)
7005 // glibc 2.24.90 glob(GLOB_NOMAGIC) does not remove backslashes used for escaping:
7006 // if you pass it "file\?", it returns "file\?", not "file?", if no match.
7007 // Which means you need to unescape the string, right? Not so fast:
7008 // if there _is_ a file named "file\?" (with backslash), it is returned
7009 // as "file\?" too (whichever pattern you used to find it, say, "file*").
7010 // You DONT KNOW by looking at the result whether you need to unescape it.
7012 // Worse, globbing of "file\?" in a directory with two files, "file?" and "file\?",
7013 // returns "file\?" - which is WRONG: "file\?" pattern matches "file?" file.
7014 // Without GLOB_NOMAGIC, this works correctly ("file?" is returned as a match).
7015 // With GLOB_NOMAGIC | GLOB_NOCHECK, this also works correctly.
7016 // i = glob(p, GLOB_NOMAGIC | GLOB_NOCHECK, NULL, &pglob);
7017 // i = glob(p, GLOB_NOMAGIC, NULL, &pglob);
7018 i = glob(p, 0, NULL, &pglob);
7019 //bb_error_msg("glob('%s'):%d '%s'...", p, i, pglob.gl_pathv ? pglob.gl_pathv[0] : "-");
7024 #if 0 // glibc 2.24.90 bug? Patterns like "*/file", when match, don't set GLOB_MAGCHAR
7025 /* GLOB_MAGCHAR is set if *?[ chars were seen (GNU) */
7026 if (!(pglob.gl_flags & GLOB_MAGCHAR))
7038 *exparg.lastp = str;
7039 rmescapes(str->text, 0);
7040 exparg.lastp = &str->next;
7042 default: /* GLOB_NOSPACE */
7045 ash_msg_and_raise_error(bb_msg_memory_exhausted);
7052 /* ENABLE_ASH_INTERNAL_GLOB: Homegrown globbing code. (dash also has both, uses homegrown one.) */
7055 * Do metacharacter (i.e. *, ?, [...]) expansion.
7058 expmeta(char *expdir, char *enddir, char *name)
7074 for (p = name; esc = 0, *p; p += esc + 1) {
7075 if (*p == '*' || *p == '?')
7077 else if (*p == '[') {
7084 if (*q == '/' || *q == '\0')
7094 if (p[esc] == '/') {
7097 start = p + esc + 1;
7101 if (metaflag == 0) { /* we've reached the end of the file name */
7102 if (enddir != expdir)
7110 if (metaflag == 0 || lstat(expdir, &statb) >= 0)
7121 } while (p < start);
7123 if (enddir == expdir) {
7125 } else if (enddir == expdir + 1 && *expdir == '/') {
7134 if (enddir != expdir)
7136 if (*endname == 0) {
7149 while (!pending_int && (dp = readdir(dirp)) != NULL) {
7150 if (dp->d_name[0] == '.' && !matchdot)
7152 if (pmatch(start, dp->d_name)) {
7154 strcpy(enddir, dp->d_name);
7157 for (p = enddir, cp = dp->d_name; (*p++ = *cp++) != '\0';)
7160 expmeta(expdir, p, endname);
7166 endname[-esc - 1] = esc ? '\\' : '/';
7169 static struct strlist *
7170 msort(struct strlist *list, int len)
7172 struct strlist *p, *q = NULL;
7173 struct strlist **lpp;
7181 for (n = half; --n >= 0;) {
7185 q->next = NULL; /* terminate first half of list */
7186 q = msort(list, half); /* sort first half of list */
7187 p = msort(p, len - half); /* sort second half */
7190 #if ENABLE_LOCALE_SUPPORT
7191 if (strcoll(p->text, q->text) < 0)
7193 if (strcmp(p->text, q->text) < 0)
7217 * Sort the results of file name expansion. It calculates the number of
7218 * strings to sort and then calls msort (short for merge sort) to do the
7221 static struct strlist *
7222 expsort(struct strlist *str)
7228 for (sp = str; sp; sp = sp->next)
7230 return msort(str, len);
7234 expandmeta(struct strlist *str /*, int flag*/)
7236 static const char metachars[] ALIGN1 = {
7239 /* TODO - EXP_REDIR */
7243 struct strlist **savelastp;
7249 if (!strpbrk(str->text, metachars))
7251 savelastp = exparg.lastp;
7254 p = preglob(str->text, RMESCAPE_ALLOC | RMESCAPE_HEAP);
7256 int i = strlen(str->text);
7257 //BUGGY estimation of how long expanded name can be
7258 expdir = ckmalloc(i < 2048 ? 2048 : i+1);
7260 expmeta(expdir, expdir, p);
7265 if (exparg.lastp == savelastp) {
7270 *exparg.lastp = str;
7271 rmescapes(str->text, 0);
7272 exparg.lastp = &str->next;
7274 *exparg.lastp = NULL;
7275 *savelastp = sp = expsort(*savelastp);
7276 while (sp->next != NULL)
7278 exparg.lastp = &sp->next;
7283 #endif /* ENABLE_ASH_INTERNAL_GLOB */
7286 * Perform variable substitution and command substitution on an argument,
7287 * placing the resulting list of arguments in arglist. If EXP_FULL is true,
7288 * perform splitting and file name expansion. When arglist is NULL, perform
7289 * here document expansion.
7292 expandarg(union node *arg, struct arglist *arglist, int flag)
7297 argbackq = arg->narg.backquote;
7298 STARTSTACKSTR(expdest);
7299 ifsfirst.next = NULL;
7301 TRACE(("expandarg: argstr('%s',flags:%x)\n", arg->narg.text, flag));
7302 argstr(arg->narg.text, flag,
7303 /* var_str_list: */ arglist ? arglist->list : NULL);
7304 p = _STPUTC('\0', expdest);
7306 if (arglist == NULL) {
7307 return; /* here document expanded */
7309 p = grabstackstr(p);
7310 TRACE(("expandarg: p:'%s'\n", p));
7311 exparg.lastp = &exparg.list;
7315 if (flag & EXP_FULL) {
7316 ifsbreakup(p, &exparg);
7317 *exparg.lastp = NULL;
7318 exparg.lastp = &exparg.list;
7319 expandmeta(exparg.list /*, flag*/);
7321 if (flag & EXP_REDIR) { /*XXX - for now, just remove escapes */
7323 TRACE(("expandarg: rmescapes:'%s'\n", p));
7325 sp = stzalloc(sizeof(*sp));
7328 exparg.lastp = &sp->next;
7332 *exparg.lastp = NULL;
7334 *arglist->lastp = exparg.list;
7335 arglist->lastp = exparg.lastp;
7340 * Expand shell variables and backquotes inside a here document.
7343 expandhere(union node *arg, int fd)
7345 expandarg(arg, (struct arglist *)NULL, EXP_QUOTED);
7346 full_write(fd, stackblock(), expdest - (char *)stackblock());
7350 * Returns true if the pattern matches the string.
7353 patmatch(char *pattern, const char *string)
7355 return pmatch(preglob(pattern, 0), string);
7359 * See if a pattern matches in a case statement.
7362 casematch(union node *pattern, char *val)
7364 struct stackmark smark;
7367 setstackmark(&smark);
7368 argbackq = pattern->narg.backquote;
7369 STARTSTACKSTR(expdest);
7371 argstr(pattern->narg.text, EXP_TILDE | EXP_CASE,
7372 /* var_str_list: */ NULL);
7373 STACKSTRNUL(expdest);
7374 result = patmatch(stackblock(), val);
7375 popstackmark(&smark);
7380 /* ============ find_command */
7384 int (*builtin)(int, char **) FAST_FUNC;
7385 /* unsigned flags; */
7387 #define IS_BUILTIN_SPECIAL(b) ((b)->name[0] & 1)
7388 /* "regular" builtins always take precedence over commands,
7389 * regardless of PATH=....%builtin... position */
7390 #define IS_BUILTIN_REGULAR(b) ((b)->name[0] & 2)
7391 #define IS_BUILTIN_ASSIGN(b) ((b)->name[0] & 4)
7394 smallint cmdtype; /* CMDxxx */
7397 /* index >= 0 for commands without path (slashes) */
7398 /* (TODO: what exactly does the value mean? PATH position?) */
7399 /* index == -1 for commands with slashes */
7400 /* index == (-2 - applet_no) for NOFORK applets */
7401 const struct builtincmd *cmd;
7402 struct funcnode *func;
7405 /* values of cmdtype */
7406 #define CMDUNKNOWN -1 /* no entry in table for command */
7407 #define CMDNORMAL 0 /* command is an executable program */
7408 #define CMDFUNCTION 1 /* command is a shell function */
7409 #define CMDBUILTIN 2 /* command is a shell builtin */
7411 /* action to find_command() */
7412 #define DO_ERR 0x01 /* prints errors */
7413 #define DO_ABS 0x02 /* checks absolute paths */
7414 #define DO_NOFUNC 0x04 /* don't return shell functions, for command */
7415 #define DO_ALTPATH 0x08 /* using alternate path */
7416 #define DO_ALTBLTIN 0x20 /* %builtin in alt. path */
7418 static void find_command(char *, struct cmdentry *, int, const char *);
7421 /* ============ Hashing commands */
7424 * When commands are first encountered, they are entered in a hash table.
7425 * This ensures that a full path search will not have to be done for them
7426 * on each invocation.
7428 * We should investigate converting to a linear search, even though that
7429 * would make the command name "hash" a misnomer.
7433 struct tblentry *next; /* next entry in hash chain */
7434 union param param; /* definition of builtin function */
7435 smallint cmdtype; /* CMDxxx */
7436 char rehash; /* if set, cd done since entry created */
7437 char cmdname[1]; /* name of command */
7440 static struct tblentry **cmdtable;
7441 #define INIT_G_cmdtable() do { \
7442 cmdtable = xzalloc(CMDTABLESIZE * sizeof(cmdtable[0])); \
7445 static int builtinloc = -1; /* index in path of %builtin, or -1 */
7449 tryexec(IF_FEATURE_SH_STANDALONE(int applet_no,) char *cmd, char **argv, char **envp)
7451 #if ENABLE_FEATURE_SH_STANDALONE
7452 if (applet_no >= 0) {
7453 if (APPLET_IS_NOEXEC(applet_no)) {
7457 run_applet_no_and_exit(applet_no, argv);
7459 /* re-exec ourselves with the new arguments */
7460 execve(bb_busybox_exec_path, argv, envp);
7461 /* If they called chroot or otherwise made the binary no longer
7462 * executable, fall through */
7469 execve(cmd, argv, envp);
7470 } while (errno == EINTR);
7472 execve(cmd, argv, envp);
7474 if (cmd != (char*) bb_busybox_exec_path && errno == ENOEXEC) {
7475 /* Run "cmd" as a shell script:
7476 * http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html
7477 * "If the execve() function fails with ENOEXEC, the shell
7478 * shall execute a command equivalent to having a shell invoked
7479 * with the command name as its first operand,
7480 * with any remaining arguments passed to the new shell"
7482 * That is, do not use $SHELL, user's shell, or /bin/sh;
7483 * just call ourselves.
7485 * Note that bash reads ~80 chars of the file, and if it sees
7486 * a zero byte before it sees newline, it doesn't try to
7487 * interpret it, but fails with "cannot execute binary file"
7488 * message and exit code 126. For one, this prevents attempts
7489 * to interpret foreign ELF binaries as shell scripts.
7492 cmd = (char*) bb_busybox_exec_path;
7493 /* NB: this is only possible because all callers of shellexec()
7494 * ensure that the argv[-1] slot exists!
7497 argv[0] = (char*) "ash";
7503 * Exec a program. Never returns. If you change this routine, you may
7504 * have to change the find_command routine as well.
7505 * argv[-1] must exist and be writable! See tryexec() for why.
7507 static void shellexec(char **, const char *, int) NORETURN;
7509 shellexec(char **argv, const char *path, int idx)
7515 int applet_no = -1; /* used only by FEATURE_SH_STANDALONE */
7517 envp = listvars(VEXPORT, VUNSET, /*end:*/ NULL);
7518 if (strchr(argv[0], '/') != NULL
7519 #if ENABLE_FEATURE_SH_STANDALONE
7520 || (applet_no = find_applet_by_name(argv[0])) >= 0
7523 tryexec(IF_FEATURE_SH_STANDALONE(applet_no,) argv[0], argv, envp);
7524 if (applet_no >= 0) {
7525 /* We tried execing ourself, but it didn't work.
7526 * Maybe /proc/self/exe doesn't exist?
7535 while ((cmdname = path_advance(&path, argv[0])) != NULL) {
7536 if (--idx < 0 && pathopt == NULL) {
7537 tryexec(IF_FEATURE_SH_STANDALONE(-1,) cmdname, argv, envp);
7538 if (errno != ENOENT && errno != ENOTDIR)
7545 /* Map to POSIX errors */
7557 exitstatus = exerrno;
7558 TRACE(("shellexec failed for %s, errno %d, suppress_int %d\n",
7559 argv[0], e, suppress_int));
7560 ash_msg_and_raise(EXEXIT, "%s: %s", argv[0], errmsg(e, "not found"));
7565 printentry(struct tblentry *cmdp)
7571 idx = cmdp->param.index;
7574 name = path_advance(&path, cmdp->cmdname);
7576 } while (--idx >= 0);
7577 out1fmt("%s%s\n", name, (cmdp->rehash ? "*" : nullstr));
7581 * Clear out command entries. The argument specifies the first entry in
7582 * PATH which has changed.
7585 clearcmdentry(int firstchange)
7587 struct tblentry **tblp;
7588 struct tblentry **pp;
7589 struct tblentry *cmdp;
7592 for (tblp = cmdtable; tblp < &cmdtable[CMDTABLESIZE]; tblp++) {
7594 while ((cmdp = *pp) != NULL) {
7595 if ((cmdp->cmdtype == CMDNORMAL &&
7596 cmdp->param.index >= firstchange)
7597 || (cmdp->cmdtype == CMDBUILTIN &&
7598 builtinloc >= firstchange)
7611 * Locate a command in the command hash table. If "add" is nonzero,
7612 * add the command to the table if it is not already present. The
7613 * variable "lastcmdentry" is set to point to the address of the link
7614 * pointing to the entry, so that delete_cmd_entry can delete the
7617 * Interrupts must be off if called with add != 0.
7619 static struct tblentry **lastcmdentry;
7621 static struct tblentry *
7622 cmdlookup(const char *name, int add)
7624 unsigned int hashval;
7626 struct tblentry *cmdp;
7627 struct tblentry **pp;
7630 hashval = (unsigned char)*p << 4;
7632 hashval += (unsigned char)*p++;
7634 pp = &cmdtable[hashval % CMDTABLESIZE];
7635 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7636 if (strcmp(cmdp->cmdname, name) == 0)
7640 if (add && cmdp == NULL) {
7641 cmdp = *pp = ckzalloc(sizeof(struct tblentry)
7643 /* + 1 - already done because
7644 * tblentry::cmdname is char[1] */);
7645 /*cmdp->next = NULL; - ckzalloc did it */
7646 cmdp->cmdtype = CMDUNKNOWN;
7647 strcpy(cmdp->cmdname, name);
7654 * Delete the command entry returned on the last lookup.
7657 delete_cmd_entry(void)
7659 struct tblentry *cmdp;
7662 cmdp = *lastcmdentry;
7663 *lastcmdentry = cmdp->next;
7664 if (cmdp->cmdtype == CMDFUNCTION)
7665 freefunc(cmdp->param.func);
7671 * Add a new command entry, replacing any existing command entry for
7672 * the same name - except special builtins.
7675 addcmdentry(char *name, struct cmdentry *entry)
7677 struct tblentry *cmdp;
7679 cmdp = cmdlookup(name, 1);
7680 if (cmdp->cmdtype == CMDFUNCTION) {
7681 freefunc(cmdp->param.func);
7683 cmdp->cmdtype = entry->cmdtype;
7684 cmdp->param = entry->u;
7688 static int FAST_FUNC
7689 hashcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
7691 struct tblentry **pp;
7692 struct tblentry *cmdp;
7694 struct cmdentry entry;
7697 if (nextopt("r") != '\0') {
7702 if (*argptr == NULL) {
7703 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
7704 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7705 if (cmdp->cmdtype == CMDNORMAL)
7713 while ((name = *argptr) != NULL) {
7714 cmdp = cmdlookup(name, 0);
7716 && (cmdp->cmdtype == CMDNORMAL
7717 || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))
7721 find_command(name, &entry, DO_ERR, pathval());
7722 if (entry.cmdtype == CMDUNKNOWN)
7730 * Called when a cd is done. Marks all commands so the next time they
7731 * are executed they will be rehashed.
7736 struct tblentry **pp;
7737 struct tblentry *cmdp;
7739 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
7740 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7741 if (cmdp->cmdtype == CMDNORMAL
7742 || (cmdp->cmdtype == CMDBUILTIN
7743 && !IS_BUILTIN_REGULAR(cmdp->param.cmd)
7753 * Fix command hash table when PATH changed.
7754 * Called before PATH is changed. The argument is the new value of PATH;
7755 * pathval() still returns the old value at this point.
7756 * Called with interrupts off.
7758 static void FAST_FUNC
7759 changepath(const char *new)
7767 firstchange = 9999; /* assume no change */
7773 if ((*old == '\0' && *new == ':')
7774 || (*old == ':' && *new == '\0')
7778 old = new; /* ignore subsequent differences */
7782 if (*new == '%' && idx_bltin < 0 && prefix(new + 1, "builtin"))
7789 if (builtinloc < 0 && idx_bltin >= 0)
7790 builtinloc = idx_bltin; /* zap builtins */
7791 if (builtinloc >= 0 && idx_bltin < 0)
7793 clearcmdentry(firstchange);
7794 builtinloc = idx_bltin;
7819 #if ENABLE_ASH_BASH_COMPAT
7830 typedef smallint token_id_t;
7832 /* Nth bit indicates if token marks the end of a list */
7835 /* 0 */ | (1u << TEOF)
7836 /* 1 */ | (0u << TNL)
7837 /* 2 */ | (0u << TREDIR)
7838 /* 3 */ | (0u << TWORD)
7839 /* 4 */ | (0u << TSEMI)
7840 /* 5 */ | (0u << TBACKGND)
7841 /* 6 */ | (0u << TAND)
7842 /* 7 */ | (0u << TOR)
7843 /* 8 */ | (0u << TPIPE)
7844 /* 9 */ | (0u << TLP)
7845 /* 10 */ | (1u << TRP)
7846 /* 11 */ | (1u << TENDCASE)
7847 /* 12 */ | (1u << TENDBQUOTE)
7848 /* 13 */ | (0u << TNOT)
7849 /* 14 */ | (0u << TCASE)
7850 /* 15 */ | (1u << TDO)
7851 /* 16 */ | (1u << TDONE)
7852 /* 17 */ | (1u << TELIF)
7853 /* 18 */ | (1u << TELSE)
7854 /* 19 */ | (1u << TESAC)
7855 /* 20 */ | (1u << TFI)
7856 /* 21 */ | (0u << TFOR)
7857 #if ENABLE_ASH_BASH_COMPAT
7858 /* 22 */ | (0u << TFUNCTION)
7860 /* 23 */ | (0u << TIF)
7861 /* 24 */ | (0u << TIN)
7862 /* 25 */ | (1u << TTHEN)
7863 /* 26 */ | (0u << TUNTIL)
7864 /* 27 */ | (0u << TWHILE)
7865 /* 28 */ | (0u << TBEGIN)
7866 /* 29 */ | (1u << TEND)
7867 , /* thus far 29 bits used */
7870 static const char *const tokname_array[] = {
7884 #define KWDOFFSET 13
7885 /* the following are keywords */
7895 #if ENABLE_ASH_BASH_COMPAT
7907 /* Wrapper around strcmp for qsort/bsearch/... */
7909 pstrcmp(const void *a, const void *b)
7911 return strcmp((char*)a, *(char**)b);
7914 static const char *const *
7915 findkwd(const char *s)
7917 return bsearch(s, tokname_array + KWDOFFSET,
7918 ARRAY_SIZE(tokname_array) - KWDOFFSET,
7919 sizeof(tokname_array[0]), pstrcmp);
7923 * Locate and print what a word is...
7926 describe_command(char *command, const char *path, int describe_command_verbose)
7928 struct cmdentry entry;
7929 struct tblentry *cmdp;
7930 #if ENABLE_ASH_ALIAS
7931 const struct alias *ap;
7934 path = path ? path : pathval();
7936 if (describe_command_verbose) {
7940 /* First look at the keywords */
7941 if (findkwd(command)) {
7942 out1str(describe_command_verbose ? " is a shell keyword" : command);
7946 #if ENABLE_ASH_ALIAS
7947 /* Then look at the aliases */
7948 ap = lookupalias(command, 0);
7950 if (!describe_command_verbose) {
7955 out1fmt(" is an alias for %s", ap->val);
7959 /* Then check if it is a tracked alias */
7960 cmdp = cmdlookup(command, 0);
7962 entry.cmdtype = cmdp->cmdtype;
7963 entry.u = cmdp->param;
7965 /* Finally use brute force */
7966 find_command(command, &entry, DO_ABS, path);
7969 switch (entry.cmdtype) {
7971 int j = entry.u.index;
7977 p = path_advance(&path, command);
7981 if (describe_command_verbose) {
7983 (cmdp ? " a tracked alias for" : nullstr), p
7992 if (describe_command_verbose) {
7993 out1str(" is a shell function");
8000 if (describe_command_verbose) {
8001 out1fmt(" is a %sshell builtin",
8002 IS_BUILTIN_SPECIAL(entry.u.cmd) ?
8003 "special " : nullstr
8011 if (describe_command_verbose) {
8012 out1str(": not found\n");
8021 static int FAST_FUNC
8022 typecmd(int argc UNUSED_PARAM, char **argv)
8028 /* type -p ... ? (we don't bother checking for 'p') */
8029 if (argv[1] && argv[1][0] == '-') {
8034 err |= describe_command(argv[i++], NULL, verbose);
8039 #if ENABLE_ASH_CMDCMD
8040 /* Is it "command [-p] PROG ARGS" bltin, no other opts? Return ptr to "PROG" if yes */
8042 parse_command_args(char **argv, const char **path)
8055 if (c == '-' && !*cp) {
8063 *path = bb_default_path;
8066 /* run 'typecmd' for other options */
8075 static int FAST_FUNC
8076 commandcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
8084 const char *path = NULL;
8086 /* "command [-p] PROG ARGS" (that is, without -V or -v)
8087 * never reaches this function.
8090 while ((c = nextopt("pvV")) != '\0')
8092 verify |= VERIFY_VERBOSE;
8094 /*verify |= VERIFY_BRIEF*/;
8100 path = bb_default_path;
8102 /* Mimic bash: just "command -v" doesn't complain, it's a nop */
8104 if (/*verify && */ cmd)
8105 return describe_command(cmd, path, verify /* - VERIFY_BRIEF*/);
8112 /*static int funcblocksize; // size of structures in function */
8113 /*static int funcstringsize; // size of strings in node */
8114 static void *funcblock; /* block to allocate function from */
8115 static char *funcstring_end; /* end of block to allocate strings from */
8117 /* flags in argument to evaltree */
8118 #define EV_EXIT 01 /* exit after evaluating tree */
8119 #define EV_TESTED 02 /* exit status is checked; ignore -e flag */
8121 static const uint8_t nodesize[N_NUMBER] ALIGN1 = {
8122 [NCMD ] = SHELL_ALIGN(sizeof(struct ncmd)),
8123 [NPIPE ] = SHELL_ALIGN(sizeof(struct npipe)),
8124 [NREDIR ] = SHELL_ALIGN(sizeof(struct nredir)),
8125 [NBACKGND ] = SHELL_ALIGN(sizeof(struct nredir)),
8126 [NSUBSHELL] = SHELL_ALIGN(sizeof(struct nredir)),
8127 [NAND ] = SHELL_ALIGN(sizeof(struct nbinary)),
8128 [NOR ] = SHELL_ALIGN(sizeof(struct nbinary)),
8129 [NSEMI ] = SHELL_ALIGN(sizeof(struct nbinary)),
8130 [NIF ] = SHELL_ALIGN(sizeof(struct nif)),
8131 [NWHILE ] = SHELL_ALIGN(sizeof(struct nbinary)),
8132 [NUNTIL ] = SHELL_ALIGN(sizeof(struct nbinary)),
8133 [NFOR ] = SHELL_ALIGN(sizeof(struct nfor)),
8134 [NCASE ] = SHELL_ALIGN(sizeof(struct ncase)),
8135 [NCLIST ] = SHELL_ALIGN(sizeof(struct nclist)),
8136 [NDEFUN ] = SHELL_ALIGN(sizeof(struct narg)),
8137 [NARG ] = SHELL_ALIGN(sizeof(struct narg)),
8138 [NTO ] = SHELL_ALIGN(sizeof(struct nfile)),
8139 #if ENABLE_ASH_BASH_COMPAT
8140 [NTO2 ] = SHELL_ALIGN(sizeof(struct nfile)),
8142 [NCLOBBER ] = SHELL_ALIGN(sizeof(struct nfile)),
8143 [NFROM ] = SHELL_ALIGN(sizeof(struct nfile)),
8144 [NFROMTO ] = SHELL_ALIGN(sizeof(struct nfile)),
8145 [NAPPEND ] = SHELL_ALIGN(sizeof(struct nfile)),
8146 [NTOFD ] = SHELL_ALIGN(sizeof(struct ndup)),
8147 [NFROMFD ] = SHELL_ALIGN(sizeof(struct ndup)),
8148 [NHERE ] = SHELL_ALIGN(sizeof(struct nhere)),
8149 [NXHERE ] = SHELL_ALIGN(sizeof(struct nhere)),
8150 [NNOT ] = SHELL_ALIGN(sizeof(struct nnot)),
8153 static int calcsize(int funcblocksize, union node *n);
8156 sizenodelist(int funcblocksize, struct nodelist *lp)
8159 funcblocksize += SHELL_ALIGN(sizeof(struct nodelist));
8160 funcblocksize = calcsize(funcblocksize, lp->n);
8163 return funcblocksize;
8167 calcsize(int funcblocksize, union node *n)
8170 return funcblocksize;
8171 funcblocksize += nodesize[n->type];
8174 funcblocksize = calcsize(funcblocksize, n->ncmd.redirect);
8175 funcblocksize = calcsize(funcblocksize, n->ncmd.args);
8176 funcblocksize = calcsize(funcblocksize, n->ncmd.assign);
8179 funcblocksize = sizenodelist(funcblocksize, n->npipe.cmdlist);
8184 funcblocksize = calcsize(funcblocksize, n->nredir.redirect);
8185 funcblocksize = calcsize(funcblocksize, n->nredir.n);
8192 funcblocksize = calcsize(funcblocksize, n->nbinary.ch2);
8193 funcblocksize = calcsize(funcblocksize, n->nbinary.ch1);
8196 funcblocksize = calcsize(funcblocksize, n->nif.elsepart);
8197 funcblocksize = calcsize(funcblocksize, n->nif.ifpart);
8198 funcblocksize = calcsize(funcblocksize, n->nif.test);
8201 funcblocksize += SHELL_ALIGN(strlen(n->nfor.var) + 1); /* was funcstringsize += ... */
8202 funcblocksize = calcsize(funcblocksize, n->nfor.body);
8203 funcblocksize = calcsize(funcblocksize, n->nfor.args);
8206 funcblocksize = calcsize(funcblocksize, n->ncase.cases);
8207 funcblocksize = calcsize(funcblocksize, n->ncase.expr);
8210 funcblocksize = calcsize(funcblocksize, n->nclist.body);
8211 funcblocksize = calcsize(funcblocksize, n->nclist.pattern);
8212 funcblocksize = calcsize(funcblocksize, n->nclist.next);
8216 funcblocksize = sizenodelist(funcblocksize, n->narg.backquote);
8217 funcblocksize += SHELL_ALIGN(strlen(n->narg.text) + 1); /* was funcstringsize += ... */
8218 funcblocksize = calcsize(funcblocksize, n->narg.next);
8221 #if ENABLE_ASH_BASH_COMPAT
8228 funcblocksize = calcsize(funcblocksize, n->nfile.fname);
8229 funcblocksize = calcsize(funcblocksize, n->nfile.next);
8233 funcblocksize = calcsize(funcblocksize, n->ndup.vname);
8234 funcblocksize = calcsize(funcblocksize, n->ndup.next);
8238 funcblocksize = calcsize(funcblocksize, n->nhere.doc);
8239 funcblocksize = calcsize(funcblocksize, n->nhere.next);
8242 funcblocksize = calcsize(funcblocksize, n->nnot.com);
8245 return funcblocksize;
8249 nodeckstrdup(char *s)
8251 funcstring_end -= SHELL_ALIGN(strlen(s) + 1);
8252 return strcpy(funcstring_end, s);
8255 static union node *copynode(union node *);
8257 static struct nodelist *
8258 copynodelist(struct nodelist *lp)
8260 struct nodelist *start;
8261 struct nodelist **lpp;
8266 funcblock = (char *) funcblock + SHELL_ALIGN(sizeof(struct nodelist));
8267 (*lpp)->n = copynode(lp->n);
8269 lpp = &(*lpp)->next;
8276 copynode(union node *n)
8283 funcblock = (char *) funcblock + nodesize[n->type];
8287 new->ncmd.redirect = copynode(n->ncmd.redirect);
8288 new->ncmd.args = copynode(n->ncmd.args);
8289 new->ncmd.assign = copynode(n->ncmd.assign);
8292 new->npipe.cmdlist = copynodelist(n->npipe.cmdlist);
8293 new->npipe.pipe_backgnd = n->npipe.pipe_backgnd;
8298 new->nredir.redirect = copynode(n->nredir.redirect);
8299 new->nredir.n = copynode(n->nredir.n);
8306 new->nbinary.ch2 = copynode(n->nbinary.ch2);
8307 new->nbinary.ch1 = copynode(n->nbinary.ch1);
8310 new->nif.elsepart = copynode(n->nif.elsepart);
8311 new->nif.ifpart = copynode(n->nif.ifpart);
8312 new->nif.test = copynode(n->nif.test);
8315 new->nfor.var = nodeckstrdup(n->nfor.var);
8316 new->nfor.body = copynode(n->nfor.body);
8317 new->nfor.args = copynode(n->nfor.args);
8320 new->ncase.cases = copynode(n->ncase.cases);
8321 new->ncase.expr = copynode(n->ncase.expr);
8324 new->nclist.body = copynode(n->nclist.body);
8325 new->nclist.pattern = copynode(n->nclist.pattern);
8326 new->nclist.next = copynode(n->nclist.next);
8330 new->narg.backquote = copynodelist(n->narg.backquote);
8331 new->narg.text = nodeckstrdup(n->narg.text);
8332 new->narg.next = copynode(n->narg.next);
8335 #if ENABLE_ASH_BASH_COMPAT
8342 new->nfile.fname = copynode(n->nfile.fname);
8343 new->nfile.fd = n->nfile.fd;
8344 new->nfile.next = copynode(n->nfile.next);
8348 new->ndup.vname = copynode(n->ndup.vname);
8349 new->ndup.dupfd = n->ndup.dupfd;
8350 new->ndup.fd = n->ndup.fd;
8351 new->ndup.next = copynode(n->ndup.next);
8355 new->nhere.doc = copynode(n->nhere.doc);
8356 new->nhere.fd = n->nhere.fd;
8357 new->nhere.next = copynode(n->nhere.next);
8360 new->nnot.com = copynode(n->nnot.com);
8363 new->type = n->type;
8368 * Make a copy of a parse tree.
8370 static struct funcnode *
8371 copyfunc(union node *n)
8376 /*funcstringsize = 0;*/
8377 blocksize = offsetof(struct funcnode, n) + calcsize(0, n);
8378 f = ckzalloc(blocksize /* + funcstringsize */);
8379 funcblock = (char *) f + offsetof(struct funcnode, n);
8380 funcstring_end = (char *) f + blocksize;
8382 /* f->count = 0; - ckzalloc did it */
8387 * Define a shell function.
8390 defun(union node *func)
8392 struct cmdentry entry;
8395 entry.cmdtype = CMDFUNCTION;
8396 entry.u.func = copyfunc(func);
8397 addcmdentry(func->narg.text, &entry);
8401 /* Reasons for skipping commands (see comment on breakcmd routine) */
8402 #define SKIPBREAK (1 << 0)
8403 #define SKIPCONT (1 << 1)
8404 #define SKIPFUNC (1 << 2)
8405 static smallint evalskip; /* set to SKIPxxx if we are skipping commands */
8406 static int skipcount; /* number of levels to skip */
8407 static int funcnest; /* depth of function calls */
8408 static int loopnest; /* current loop nesting level */
8410 /* Forward decl way out to parsing code - dotrap needs it */
8411 static int evalstring(char *s, int flags);
8413 /* Called to execute a trap.
8414 * Single callsite - at the end of evaltree().
8415 * If we return non-zero, evaltree raises EXEXIT exception.
8417 * Perhaps we should avoid entering new trap handlers
8418 * while we are executing a trap handler. [is it a TODO?]
8425 uint8_t last_status;
8430 last_status = exitstatus;
8434 TRACE(("dotrap entered\n"));
8435 for (sig = 1, g = gotsig; sig < NSIG; sig++, g++) {
8447 /* non-trapped SIGINT is handled separately by raise_interrupt,
8448 * don't upset it by resetting gotsig[SIGINT-1] */
8449 if (sig == SIGINT && !p)
8452 TRACE(("sig %d is active, will run handler '%s'\n", sig, p));
8458 exitstatus = last_status;
8459 TRACE(("dotrap returns\n"));
8462 /* forward declarations - evaluation is fairly recursive business... */
8463 static int evalloop(union node *, int);
8464 static int evalfor(union node *, int);
8465 static int evalcase(union node *, int);
8466 static int evalsubshell(union node *, int);
8467 static void expredir(union node *);
8468 static int evalpipe(union node *, int);
8469 static int evalcommand(union node *, int);
8470 static int evalbltin(const struct builtincmd *, int, char **, int);
8471 static void prehash(union node *);
8474 * Evaluate a parse tree. The value is left in the global variable
8478 evaltree(union node *n, int flags)
8480 struct jmploc *volatile savehandler = exception_handler;
8481 struct jmploc jmploc;
8483 int (*evalfn)(union node *, int);
8487 SAVE_INT(int_level);
8490 TRACE(("evaltree(NULL) called\n"));
8493 TRACE(("evaltree(%p: %d, %d) called\n", n, n->type, flags));
8497 exception_handler = &jmploc;
8499 int err = setjmp(jmploc.loc);
8501 /* if it was a signal, check for trap handlers */
8502 if (exception_type == EXSIG) {
8503 TRACE(("exception %d (EXSIG) in evaltree, err=%d\n",
8504 exception_type, err));
8507 /* continue on the way out */
8508 TRACE(("exception %d in evaltree, propagating err=%d\n",
8509 exception_type, err));
8510 exception_handler = savehandler;
8511 longjmp(exception_handler->loc, err);
8518 out1fmt("Node type = %d\n", n->type);
8523 status = !evaltree(n->nnot.com, EV_TESTED);
8526 expredir(n->nredir.redirect);
8527 status = redirectsafe(n->nredir.redirect, REDIR_PUSH);
8529 status = evaltree(n->nredir.n, flags & EV_TESTED);
8531 if (n->nredir.redirect)
8532 popredir(/*drop:*/ 0, /*restore:*/ 0 /* not sure */);
8535 evalfn = evalcommand;
8537 if (eflag && !(flags & EV_TESTED))
8549 evalfn = evalsubshell;
8562 #error NAND + 1 != NOR
8564 #if NOR + 1 != NSEMI
8565 #error NOR + 1 != NSEMI
8567 unsigned is_or = n->type - NAND;
8570 (flags | ((is_or >> 1) - 1)) & EV_TESTED
8572 if ((!status) == is_or || evalskip)
8578 status = evalfn(n, flags);
8582 status = evaltree(n->nif.test, EV_TESTED);
8589 if (n->nif.elsepart) {
8590 n = n->nif.elsepart;
8597 /* Not necessary. To test it:
8598 * "false; f() { qwerty; }; echo $?" should print 0.
8602 exitstatus = status;
8607 exception_handler = savehandler;
8610 /* Order of checks below is important:
8611 * signal handlers trigger before exit caused by "set -e".
8615 if (checkexit & status)
8616 raise_exception(EXEXIT);
8617 if (flags & EV_EXIT)
8618 raise_exception(EXEXIT);
8620 RESTORE_INT(int_level);
8621 TRACE(("leaving evaltree (no interrupts)\n"));
8626 #if !defined(__alpha__) || (defined(__GNUC__) && __GNUC__ >= 3)
8629 int evaltreenr(union node *, int) __attribute__ ((alias("evaltree"),__noreturn__));
8634 int skip = evalskip;
8641 if (--skipcount <= 0) {
8652 evalloop(union node *n, int flags)
8663 i = evaltree(n->nbinary.ch1, EV_TESTED);
8665 if (skip == SKIPFUNC)
8669 if (n->type != NWHILE)
8673 status = evaltree(n->nbinary.ch2, flags);
8675 } while (!(skip & ~SKIPCONT));
8682 evalfor(union node *n, int flags)
8684 struct arglist arglist;
8687 struct stackmark smark;
8690 setstackmark(&smark);
8691 arglist.list = NULL;
8692 arglist.lastp = &arglist.list;
8693 for (argp = n->nfor.args; argp; argp = argp->narg.next) {
8694 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
8696 *arglist.lastp = NULL;
8700 for (sp = arglist.list; sp; sp = sp->next) {
8701 setvar0(n->nfor.var, sp->text);
8702 status = evaltree(n->nfor.body, flags);
8703 if (skiploop() & ~SKIPCONT)
8707 popstackmark(&smark);
8713 evalcase(union node *n, int flags)
8717 struct arglist arglist;
8718 struct stackmark smark;
8721 setstackmark(&smark);
8722 arglist.list = NULL;
8723 arglist.lastp = &arglist.list;
8724 expandarg(n->ncase.expr, &arglist, EXP_TILDE);
8725 for (cp = n->ncase.cases; cp && evalskip == 0; cp = cp->nclist.next) {
8726 for (patp = cp->nclist.pattern; patp; patp = patp->narg.next) {
8727 if (casematch(patp, arglist.list->text)) {
8728 /* Ensure body is non-empty as otherwise
8729 * EV_EXIT may prevent us from setting the
8732 if (evalskip == 0 && cp->nclist.body) {
8733 status = evaltree(cp->nclist.body, flags);
8740 popstackmark(&smark);
8746 * Kick off a subshell to evaluate a tree.
8749 evalsubshell(union node *n, int flags)
8752 int backgnd = (n->type == NBACKGND);
8755 expredir(n->nredir.redirect);
8756 if (!backgnd && (flags & EV_EXIT) && !may_have_traps)
8759 jp = makejob(/*n,*/ 1);
8760 if (forkshell(jp, n, backgnd) == 0) {
8765 flags &= ~EV_TESTED;
8767 redirect(n->nredir.redirect, 0);
8768 evaltreenr(n->nredir.n, flags);
8774 status = waitforjob(jp);
8780 * Compute the names of the files in a redirection list.
8782 static void fixredir(union node *, const char *, int);
8784 expredir(union node *n)
8788 for (redir = n; redir; redir = redir->nfile.next) {
8792 fn.lastp = &fn.list;
8793 switch (redir->type) {
8797 #if ENABLE_ASH_BASH_COMPAT
8802 expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR);
8803 TRACE(("expredir expanded to '%s'\n", fn.list->text));
8804 #if ENABLE_ASH_BASH_COMPAT
8808 // By the design of stack allocator, the loop of this kind:
8809 // while true; do while true; do break; done </dev/null; done
8810 // will look like a memory leak: ash plans to free expfname's
8811 // of "/dev/null" as soon as it finishes running the loop
8812 // (in this case, never).
8813 // This "fix" is wrong:
8814 if (redir->nfile.expfname)
8815 stunalloc(redir->nfile.expfname);
8816 // It results in corrupted state of stacked allocations.
8818 redir->nfile.expfname = fn.list->text;
8821 case NTOFD: /* >& */
8822 if (redir->ndup.vname) {
8823 expandarg(redir->ndup.vname, &fn, EXP_FULL | EXP_TILDE);
8824 if (fn.list == NULL)
8825 ash_msg_and_raise_error("redir error");
8826 #if ENABLE_ASH_BASH_COMPAT
8827 //FIXME: we used expandarg with different args!
8828 if (!isdigit_str9(fn.list->text)) {
8829 /* >&file, not >&fd */
8830 if (redir->nfile.fd != 1) /* 123>&file - BAD */
8831 ash_msg_and_raise_error("redir error");
8833 goto store_expfname;
8836 fixredir(redir, fn.list->text, 1);
8844 * Evaluate a pipeline. All the processes in the pipeline are children
8845 * of the process creating the pipeline. (This differs from some versions
8846 * of the shell, which make the last process in a pipeline the parent
8850 evalpipe(union node *n, int flags)
8853 struct nodelist *lp;
8859 TRACE(("evalpipe(0x%lx) called\n", (long)n));
8861 for (lp = n->npipe.cmdlist; lp; lp = lp->next)
8865 jp = makejob(/*n,*/ pipelen);
8867 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
8871 if (pipe(pip) < 0) {
8873 ash_msg_and_raise_error("pipe call failed");
8876 if (forkshell(jp, lp->n, n->npipe.pipe_backgnd) == 0) {
8890 evaltreenr(lp->n, flags);
8897 /* Don't want to trigger debugging */
8901 if (n->npipe.pipe_backgnd == 0) {
8902 status = waitforjob(jp);
8903 TRACE(("evalpipe: job done exit status %d\n", status));
8911 * Controls whether the shell is interactive or not.
8914 setinteractive(int on)
8916 static smallint is_interactive;
8918 if (++on == is_interactive)
8920 is_interactive = on;
8924 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
8925 if (is_interactive > 1) {
8926 /* Looks like they want an interactive shell */
8927 static smallint did_banner;
8930 /* note: ash and hush share this string */
8931 out1fmt("\n\n%s %s\n"
8932 IF_ASH_HELP("Enter 'help' for a list of built-in commands.\n")
8935 "built-in shell (ash)"
8949 setinteractive(iflag);
8951 #if ENABLE_FEATURE_EDITING_VI
8953 line_input_state->flags |= VI_MODE;
8955 line_input_state->flags &= ~VI_MODE;
8957 viflag = 0; /* forcibly keep the option off */
8961 static struct localvar *localvars;
8964 * Called after a function returns.
8965 * Interrupts must be off.
8970 struct localvar *lvp;
8973 while ((lvp = localvars) != NULL) {
8974 localvars = lvp->next;
8976 TRACE(("poplocalvar %s\n", vp ? vp->var_text : "-"));
8977 if (vp == NULL) { /* $- saved */
8978 memcpy(optlist, lvp->text, sizeof(optlist));
8979 free((char*)lvp->text);
8981 } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) {
8982 unsetvar(vp->var_text);
8985 vp->var_func(var_end(lvp->text));
8986 if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
8987 free((char*)vp->var_text);
8988 vp->flags = lvp->flags;
8989 vp->var_text = lvp->text;
8996 evalfun(struct funcnode *func, int argc, char **argv, int flags)
8998 volatile struct shparam saveparam;
8999 struct localvar *volatile savelocalvars;
9000 struct jmploc *volatile savehandler;
9001 struct jmploc jmploc;
9004 saveparam = shellparam;
9005 savelocalvars = localvars;
9006 savehandler = exception_handler;
9007 e = setjmp(jmploc.loc);
9012 exception_handler = &jmploc;
9014 shellparam.malloced = 0;
9018 shellparam.nparam = argc - 1;
9019 shellparam.p = argv + 1;
9020 #if ENABLE_ASH_GETOPTS
9021 shellparam.optind = 1;
9022 shellparam.optoff = -1;
9024 evaltree(func->n.narg.next, flags & EV_TESTED);
9030 localvars = savelocalvars;
9031 freeparam(&shellparam);
9032 shellparam = saveparam;
9033 exception_handler = savehandler;
9035 evalskip &= ~SKIPFUNC;
9040 * Make a variable a local variable. When a variable is made local, it's
9041 * value and flags are saved in a localvar structure. The saved values
9042 * will be restored when the shell function returns. We handle the name
9043 * "-" as a special case: it makes changes to "set +-options" local
9044 * (options will be restored on return from the function).
9049 struct localvar *lvp;
9052 char *eq = strchr(name, '=');
9055 /* Cater for duplicate "local". Examples:
9056 * x=0; f() { local x=1; echo $x; local x; echo $x; }; f; echo $x
9057 * x=0; f() { local x=1; echo $x; local x=2; echo $x; }; f; echo $x
9061 if (lvp->vp && varcmp(lvp->vp->var_text, name) == 0) {
9065 * it's a duplicate "local VAR" declaration, do nothing
9072 lvp = ckzalloc(sizeof(*lvp));
9073 if (LONE_DASH(name)) {
9075 p = ckmalloc(sizeof(optlist));
9076 lvp->text = memcpy(p, optlist, sizeof(optlist));
9079 vpp = hashvar(name);
9080 vp = *findvar(vpp, name);
9082 /* variable did not exist yet */
9084 setvareq(name, VSTRFIXED);
9086 setvar(name, NULL, VSTRFIXED);
9087 vp = *vpp; /* the new variable */
9088 lvp->flags = VUNSET;
9090 lvp->text = vp->var_text;
9091 lvp->flags = vp->flags;
9092 /* make sure neither "struct var" nor string gets freed
9093 * during (un)setting:
9095 vp->flags |= VSTRFIXED|VTEXTFIXED;
9099 /* "local VAR" unsets VAR: */
9100 setvar0(name, NULL);
9104 lvp->next = localvars;
9110 * The "local" command.
9112 static int FAST_FUNC
9113 localcmd(int argc UNUSED_PARAM, char **argv)
9118 ash_msg_and_raise_error("not in a function");
9121 while ((name = *argv++) != NULL) {
9127 static int FAST_FUNC
9128 falsecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
9133 static int FAST_FUNC
9134 truecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
9139 static int FAST_FUNC
9140 execcmd(int argc UNUSED_PARAM, char **argv)
9143 iflag = 0; /* exit on error */
9146 /* We should set up signals for "exec CMD"
9147 * the same way as for "CMD" without "exec".
9148 * But optschanged->setinteractive->setsignal
9149 * still thought we are a root shell. Therefore, for example,
9150 * SIGQUIT is still set to IGN. Fix it:
9154 /*setsignal(SIGTERM); - unnecessary because of iflag=0 */
9155 /*setsignal(SIGTSTP); - unnecessary because of mflag=0 */
9156 /*setsignal(SIGTTOU); - unnecessary because of mflag=0 */
9158 shellexec(argv + 1, pathval(), 0);
9165 * The return command.
9167 static int FAST_FUNC
9168 returncmd(int argc UNUSED_PARAM, char **argv)
9171 * If called outside a function, do what ksh does;
9172 * skip the rest of the file.
9174 evalskip = SKIPFUNC;
9175 return argv[1] ? number(argv[1]) : exitstatus;
9178 /* Forward declarations for builtintab[] */
9179 static int breakcmd(int, char **) FAST_FUNC;
9180 static int dotcmd(int, char **) FAST_FUNC;
9181 static int evalcmd(int, char **, int) FAST_FUNC;
9182 static int exitcmd(int, char **) FAST_FUNC;
9183 static int exportcmd(int, char **) FAST_FUNC;
9184 #if ENABLE_ASH_GETOPTS
9185 static int getoptscmd(int, char **) FAST_FUNC;
9188 static int helpcmd(int, char **) FAST_FUNC;
9191 static int historycmd(int, char **) FAST_FUNC;
9193 #if ENABLE_SH_MATH_SUPPORT
9194 static int letcmd(int, char **) FAST_FUNC;
9196 static int readcmd(int, char **) FAST_FUNC;
9197 static int setcmd(int, char **) FAST_FUNC;
9198 static int shiftcmd(int, char **) FAST_FUNC;
9199 static int timescmd(int, char **) FAST_FUNC;
9200 static int trapcmd(int, char **) FAST_FUNC;
9201 static int umaskcmd(int, char **) FAST_FUNC;
9202 static int unsetcmd(int, char **) FAST_FUNC;
9203 static int ulimitcmd(int, char **) FAST_FUNC;
9205 #define BUILTIN_NOSPEC "0"
9206 #define BUILTIN_SPECIAL "1"
9207 #define BUILTIN_REGULAR "2"
9208 #define BUILTIN_SPEC_REG "3"
9209 #define BUILTIN_ASSIGN "4"
9210 #define BUILTIN_SPEC_ASSG "5"
9211 #define BUILTIN_REG_ASSG "6"
9212 #define BUILTIN_SPEC_REG_ASSG "7"
9214 /* Stubs for calling non-FAST_FUNC's */
9215 #if ENABLE_ASH_BUILTIN_ECHO
9216 static int FAST_FUNC echocmd(int argc, char **argv) { return echo_main(argc, argv); }
9218 #if ENABLE_ASH_BUILTIN_PRINTF
9219 static int FAST_FUNC printfcmd(int argc, char **argv) { return printf_main(argc, argv); }
9221 #if ENABLE_ASH_BUILTIN_TEST
9222 static int FAST_FUNC testcmd(int argc, char **argv) { return test_main(argc, argv); }
9225 /* Keep these in proper order since it is searched via bsearch() */
9226 static const struct builtincmd builtintab[] = {
9227 { BUILTIN_SPEC_REG "." , dotcmd },
9228 { BUILTIN_SPEC_REG ":" , truecmd },
9229 #if ENABLE_ASH_BUILTIN_TEST
9230 { BUILTIN_REGULAR "[" , testcmd },
9231 #if ENABLE_ASH_BASH_COMPAT
9232 { BUILTIN_REGULAR "[[" , testcmd },
9235 #if ENABLE_ASH_ALIAS
9236 { BUILTIN_REG_ASSG "alias" , aliascmd },
9239 { BUILTIN_REGULAR "bg" , fg_bgcmd },
9241 { BUILTIN_SPEC_REG "break" , breakcmd },
9242 { BUILTIN_REGULAR "cd" , cdcmd },
9243 { BUILTIN_NOSPEC "chdir" , cdcmd },
9244 #if ENABLE_ASH_CMDCMD
9245 { BUILTIN_REGULAR "command" , commandcmd },
9247 { BUILTIN_SPEC_REG "continue", breakcmd },
9248 #if ENABLE_ASH_BUILTIN_ECHO
9249 { BUILTIN_REGULAR "echo" , echocmd },
9251 { BUILTIN_SPEC_REG "eval" , NULL }, /*evalcmd() has a differing prototype*/
9252 { BUILTIN_SPEC_REG "exec" , execcmd },
9253 { BUILTIN_SPEC_REG "exit" , exitcmd },
9254 { BUILTIN_SPEC_REG_ASSG "export" , exportcmd },
9255 { BUILTIN_REGULAR "false" , falsecmd },
9257 { BUILTIN_REGULAR "fg" , fg_bgcmd },
9259 #if ENABLE_ASH_GETOPTS
9260 { BUILTIN_REGULAR "getopts" , getoptscmd },
9262 { BUILTIN_NOSPEC "hash" , hashcmd },
9264 { BUILTIN_NOSPEC "help" , helpcmd },
9267 { BUILTIN_NOSPEC "history" , historycmd },
9270 { BUILTIN_REGULAR "jobs" , jobscmd },
9271 { BUILTIN_REGULAR "kill" , killcmd },
9273 #if ENABLE_SH_MATH_SUPPORT
9274 { BUILTIN_NOSPEC "let" , letcmd },
9276 { BUILTIN_ASSIGN "local" , localcmd },
9277 #if ENABLE_ASH_BUILTIN_PRINTF
9278 { BUILTIN_REGULAR "printf" , printfcmd },
9280 { BUILTIN_NOSPEC "pwd" , pwdcmd },
9281 { BUILTIN_REGULAR "read" , readcmd },
9282 { BUILTIN_SPEC_REG_ASSG "readonly", exportcmd },
9283 { BUILTIN_SPEC_REG "return" , returncmd },
9284 { BUILTIN_SPEC_REG "set" , setcmd },
9285 { BUILTIN_SPEC_REG "shift" , shiftcmd },
9286 #if ENABLE_ASH_BASH_COMPAT
9287 { BUILTIN_SPEC_REG "source" , dotcmd },
9289 #if ENABLE_ASH_BUILTIN_TEST
9290 { BUILTIN_REGULAR "test" , testcmd },
9292 { BUILTIN_SPEC_REG "times" , timescmd },
9293 { BUILTIN_SPEC_REG "trap" , trapcmd },
9294 { BUILTIN_REGULAR "true" , truecmd },
9295 { BUILTIN_NOSPEC "type" , typecmd },
9296 { BUILTIN_NOSPEC "ulimit" , ulimitcmd },
9297 { BUILTIN_REGULAR "umask" , umaskcmd },
9298 #if ENABLE_ASH_ALIAS
9299 { BUILTIN_REGULAR "unalias" , unaliascmd },
9301 { BUILTIN_SPEC_REG "unset" , unsetcmd },
9302 { BUILTIN_REGULAR "wait" , waitcmd },
9305 /* Should match the above table! */
9306 #define COMMANDCMD (builtintab + \
9308 /* [ */ 1 * ENABLE_ASH_BUILTIN_TEST + \
9309 /* [[ */ 1 * ENABLE_ASH_BUILTIN_TEST * ENABLE_ASH_BASH_COMPAT + \
9310 /* alias */ 1 * ENABLE_ASH_ALIAS + \
9311 /* bg */ 1 * ENABLE_ASH_JOB_CONTROL + \
9312 /* break cd cddir */ 3)
9313 #define EVALCMD (COMMANDCMD + \
9314 /* command */ 1 * ENABLE_ASH_CMDCMD + \
9315 /* continue */ 1 + \
9316 /* echo */ 1 * ENABLE_ASH_BUILTIN_ECHO + \
9318 #define EXECCMD (EVALCMD + \
9322 * Search the table of builtin commands.
9325 pstrcmp1(const void *a, const void *b)
9327 return strcmp((char*)a, *(char**)b + 1);
9329 static struct builtincmd *
9330 find_builtin(const char *name)
9332 struct builtincmd *bp;
9335 name, builtintab, ARRAY_SIZE(builtintab), sizeof(builtintab[0]),
9342 * Execute a simple command.
9345 isassignment(const char *p)
9347 const char *q = endofname(p);
9352 static int FAST_FUNC
9353 bltincmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
9355 /* Preserve exitstatus of a previous possible redirection
9356 * as POSIX mandates */
9357 return back_exitstatus;
9360 evalcommand(union node *cmd, int flags)
9362 static const struct builtincmd null_bltin = {
9363 "\0\0", bltincmd /* why three NULs? */
9365 struct stackmark smark;
9367 struct arglist arglist;
9368 struct arglist varlist;
9371 const struct strlist *sp;
9372 struct cmdentry cmdentry;
9379 struct builtincmd *bcmd;
9380 smallint cmd_is_exec;
9381 smallint pseudovarflag = 0;
9383 /* First expand the arguments. */
9384 TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags));
9385 setstackmark(&smark);
9386 back_exitstatus = 0;
9388 cmdentry.cmdtype = CMDBUILTIN;
9389 cmdentry.u.cmd = &null_bltin;
9390 varlist.lastp = &varlist.list;
9391 *varlist.lastp = NULL;
9392 arglist.lastp = &arglist.list;
9393 *arglist.lastp = NULL;
9396 if (cmd->ncmd.args) {
9397 bcmd = find_builtin(cmd->ncmd.args->narg.text);
9398 pseudovarflag = bcmd && IS_BUILTIN_ASSIGN(bcmd);
9401 for (argp = cmd->ncmd.args; argp; argp = argp->narg.next) {
9402 struct strlist **spp;
9404 spp = arglist.lastp;
9405 if (pseudovarflag && isassignment(argp->narg.text))
9406 expandarg(argp, &arglist, EXP_VARTILDE);
9408 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
9410 for (sp = *spp; sp; sp = sp->next)
9414 /* Reserve one extra spot at the front for shellexec. */
9415 nargv = stalloc(sizeof(char *) * (argc + 2));
9417 for (sp = arglist.list; sp; sp = sp->next) {
9418 TRACE(("evalcommand arg: %s\n", sp->text));
9419 *nargv++ = sp->text;
9424 if (iflag && funcnest == 0 && argc > 0)
9425 lastarg = nargv[-1];
9428 expredir(cmd->ncmd.redirect);
9429 status = redirectsafe(cmd->ncmd.redirect, REDIR_PUSH | REDIR_SAVEFD2);
9431 path = vpath.var_text;
9432 for (argp = cmd->ncmd.assign; argp; argp = argp->narg.next) {
9433 struct strlist **spp;
9436 spp = varlist.lastp;
9437 expandarg(argp, &varlist, EXP_VARTILDE);
9440 * Modify the command lookup path, if a PATH= assignment
9444 if (varcmp(p, path) == 0)
9448 /* Print the command if xflag is set. */
9451 const char *p = " %s" + 1;
9453 fdprintf(preverrout_fd, p, expandstr(ps4val()));
9455 for (n = 0; n < 2; n++) {
9457 fdprintf(preverrout_fd, p, sp->text);
9463 safe_write(preverrout_fd, "\n", 1);
9469 /* Now locate the command. */
9471 int cmd_flag = DO_ERR;
9472 #if ENABLE_ASH_CMDCMD
9473 const char *oldpath = path + 5;
9477 find_command(argv[0], &cmdentry, cmd_flag, path);
9478 if (cmdentry.cmdtype == CMDUNKNOWN) {
9479 flush_stdout_stderr();
9484 /* implement bltin and command here */
9485 if (cmdentry.cmdtype != CMDBUILTIN)
9488 spclbltin = IS_BUILTIN_SPECIAL(cmdentry.u.cmd);
9489 if (cmdentry.u.cmd == EXECCMD)
9491 #if ENABLE_ASH_CMDCMD
9492 if (cmdentry.u.cmd == COMMANDCMD) {
9494 nargv = parse_command_args(argv, &path);
9497 /* It's "command [-p] PROG ARGS" (that is, no -Vv).
9498 * nargv => "PROG". path is updated if -p.
9500 argc -= nargv - argv;
9502 cmd_flag |= DO_NOFUNC;
9510 /* We have a redirection error. */
9512 raise_exception(EXERROR);
9514 exitstatus = status;
9518 /* Execute the command. */
9519 switch (cmdentry.cmdtype) {
9522 #if ENABLE_FEATURE_SH_NOFORK
9523 /* (1) BUG: if variables are set, we need to fork, or save/restore them
9524 * around run_nofork_applet() call.
9525 * (2) Should this check also be done in forkshell()?
9526 * (perhaps it should, so that "VAR=VAL nofork" at least avoids exec...)
9528 /* find_command() encodes applet_no as (-2 - applet_no) */
9529 int applet_no = (- cmdentry.u.index - 2);
9530 if (applet_no >= 0 && APPLET_IS_NOFORK(applet_no)) {
9531 listsetvar(varlist.list, VEXPORT|VSTACK);
9532 /* run <applet>_main() */
9533 status = run_nofork_applet(applet_no, argv);
9537 /* Can we avoid forking off? For example, very last command
9538 * in a script or a subshell does not need forking,
9539 * we can just exec it.
9541 if (!(flags & EV_EXIT) || may_have_traps) {
9542 /* No, forking off a child is necessary */
9544 jp = makejob(/*cmd,*/ 1);
9545 if (forkshell(jp, cmd, FORK_FG) != 0) {
9547 status = waitforjob(jp);
9549 TRACE(("forked child exited with %d\n", status));
9554 /* fall through to exec'ing external program */
9556 listsetvar(varlist.list, VEXPORT|VSTACK);
9557 shellexec(argv, path, cmdentry.u.index);
9561 cmdenviron = varlist.list;
9563 struct strlist *list = cmdenviron;
9565 if (spclbltin > 0 || argc == 0) {
9567 if (cmd_is_exec && argc > 1)
9570 listsetvar(list, i);
9572 /* Tight loop with builtins only:
9573 * "while kill -0 $child; do true; done"
9574 * will never exit even if $child died, unless we do this
9575 * to reap the zombie and make kill detect that it's gone: */
9576 dowait(DOWAIT_NONBLOCK, NULL);
9578 if (evalbltin(cmdentry.u.cmd, argc, argv, flags)) {
9580 int i = exception_type;
9585 exit_status = 128 + SIGINT;
9587 exit_status = 128 + pending_sig;
9588 exitstatus = exit_status;
9589 if (i == EXINT || spclbltin > 0) {
9591 longjmp(exception_handler->loc, 1);
9598 listsetvar(varlist.list, 0);
9599 /* See above for the rationale */
9600 dowait(DOWAIT_NONBLOCK, NULL);
9601 if (evalfun(cmdentry.u.func, argc, argv, flags))
9604 status = exitstatus;
9609 if (cmd->ncmd.redirect)
9610 popredir(/*drop:*/ cmd_is_exec, /*restore:*/ cmd_is_exec);
9612 /* dsl: I think this is intended to be used to support
9613 * '_' in 'vi' command mode during line editing...
9614 * However I implemented that within libedit itself.
9616 setvar0("_", lastarg);
9618 popstackmark(&smark);
9624 evalbltin(const struct builtincmd *cmd, int argc, char **argv, int flags)
9626 char *volatile savecmdname;
9627 struct jmploc *volatile savehandler;
9628 struct jmploc jmploc;
9632 savecmdname = commandname;
9633 savehandler = exception_handler;
9634 i = setjmp(jmploc.loc);
9637 exception_handler = &jmploc;
9638 commandname = argv[0];
9640 optptr = NULL; /* initialize nextopt */
9642 status = evalcmd(argc, argv, flags);
9644 status = (*cmd->builtin)(argc, argv);
9645 flush_stdout_stderr();
9646 status |= ferror(stdout);
9647 exitstatus = status;
9650 commandname = savecmdname;
9651 exception_handler = savehandler;
9657 goodname(const char *p)
9659 return endofname(p)[0] == '\0';
9664 * Search for a command. This is called before we fork so that the
9665 * location of the command will be available in the parent as well as
9666 * the child. The check for "goodname" is an overly conservative
9667 * check that the name will not be subject to expansion.
9670 prehash(union node *n)
9672 struct cmdentry entry;
9674 if (n->type == NCMD && n->ncmd.args && goodname(n->ncmd.args->narg.text))
9675 find_command(n->ncmd.args->narg.text, &entry, 0, pathval());
9679 /* ============ Builtin commands
9681 * Builtin commands whose functions are closely tied to evaluation
9682 * are implemented here.
9686 * Handle break and continue commands. Break, continue, and return are
9687 * all handled by setting the evalskip flag. The evaluation routines
9688 * above all check this flag, and if it is set they start skipping
9689 * commands rather than executing them. The variable skipcount is
9690 * the number of loops to break/continue, or the number of function
9691 * levels to return. (The latter is always 1.) It should probably
9692 * be an error to break out of more loops than exist, but it isn't
9693 * in the standard shell so we don't make it one here.
9695 static int FAST_FUNC
9696 breakcmd(int argc UNUSED_PARAM, char **argv)
9698 int n = argv[1] ? number(argv[1]) : 1;
9701 ash_msg_and_raise_error(msg_illnum, argv[1]);
9705 evalskip = (**argv == 'c') ? SKIPCONT : SKIPBREAK;
9713 * This implements the input routines used by the parser.
9717 INPUT_PUSH_FILE = 1,
9718 INPUT_NOFILE_OK = 2,
9721 static smallint checkkwd;
9722 /* values of checkkwd variable */
9723 #define CHKALIAS 0x1
9728 * Push a string back onto the input at this current parsefile level.
9729 * We handle aliases this way.
9731 #if !ENABLE_ASH_ALIAS
9732 #define pushstring(s, ap) pushstring(s)
9735 pushstring(char *s, struct alias *ap)
9742 if (g_parsefile->strpush) {
9743 sp = ckzalloc(sizeof(*sp));
9744 sp->prev = g_parsefile->strpush;
9746 sp = &(g_parsefile->basestrpush);
9748 g_parsefile->strpush = sp;
9749 sp->prev_string = g_parsefile->next_to_pgetc;
9750 sp->prev_left_in_line = g_parsefile->left_in_line;
9751 sp->unget = g_parsefile->unget;
9752 memcpy(sp->lastc, g_parsefile->lastc, sizeof(sp->lastc));
9753 #if ENABLE_ASH_ALIAS
9756 ap->flag |= ALIASINUSE;
9760 g_parsefile->next_to_pgetc = s;
9761 g_parsefile->left_in_line = len;
9762 g_parsefile->unget = 0;
9769 struct strpush *sp = g_parsefile->strpush;
9772 #if ENABLE_ASH_ALIAS
9774 if (g_parsefile->next_to_pgetc[-1] == ' '
9775 || g_parsefile->next_to_pgetc[-1] == '\t'
9777 checkkwd |= CHKALIAS;
9779 if (sp->string != sp->ap->val) {
9782 sp->ap->flag &= ~ALIASINUSE;
9783 if (sp->ap->flag & ALIASDEAD) {
9784 unalias(sp->ap->name);
9788 g_parsefile->next_to_pgetc = sp->prev_string;
9789 g_parsefile->left_in_line = sp->prev_left_in_line;
9790 g_parsefile->unget = sp->unget;
9791 memcpy(g_parsefile->lastc, sp->lastc, sizeof(sp->lastc));
9792 g_parsefile->strpush = sp->prev;
9793 if (sp != &(g_parsefile->basestrpush))
9802 char *buf = g_parsefile->buf;
9804 g_parsefile->next_to_pgetc = buf;
9805 #if ENABLE_FEATURE_EDITING
9807 if (!iflag || g_parsefile->pf_fd != STDIN_FILENO)
9808 nr = nonblock_immune_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1);
9811 # if ENABLE_ASH_IDLE_TIMEOUT
9813 const char *tmout_var = lookupvar("TMOUT");
9815 timeout = atoi(tmout_var) * 1000;
9821 # if ENABLE_FEATURE_TAB_COMPLETION
9822 line_input_state->path_lookup = pathval();
9824 reinit_unicode_for_ash();
9825 nr = read_line_input(line_input_state, cmdedit_prompt, buf, IBUFSIZ, timeout);
9827 /* Ctrl+C pressed */
9838 /* Ctrl+D pressed */
9841 # if ENABLE_ASH_IDLE_TIMEOUT
9842 else if (errno == EAGAIN && timeout > 0) {
9843 puts("\007timed out waiting for input: auto-logout");
9850 nr = nonblock_immune_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1);
9853 #if 0 /* disabled: nonblock_immune_read() handles this problem */
9855 if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
9856 int flags = fcntl(0, F_GETFL);
9857 if (flags >= 0 && (flags & O_NONBLOCK)) {
9858 flags &= ~O_NONBLOCK;
9859 if (fcntl(0, F_SETFL, flags) >= 0) {
9860 out2str("sh: turning off NDELAY mode\n");
9871 * Refill the input buffer and return the next input character:
9873 * 1) If a string was pushed back on the input, pop it;
9874 * 2) If an EOF was pushed back (g_parsefile->left_in_line < -BIGNUM)
9875 * or we are reading from a string so we can't refill the buffer,
9877 * 3) If there is more stuff in this buffer, use it else call read to fill it.
9878 * 4) Process input up to the next newline, deleting nul characters.
9880 //#define pgetc_debug(...) bb_error_msg(__VA_ARGS__)
9881 #define pgetc_debug(...) ((void)0)
9882 static int pgetc(void);
9889 if (g_parsefile->strpush) {
9890 #if ENABLE_ASH_ALIAS
9891 if (g_parsefile->left_in_line == -1
9892 && g_parsefile->strpush->ap
9893 && g_parsefile->next_to_pgetc[-1] != ' '
9894 && g_parsefile->next_to_pgetc[-1] != '\t'
9896 pgetc_debug("preadbuffer PEOA");
9903 /* on both branches above g_parsefile->left_in_line < 0.
9904 * "pgetc" needs refilling.
9907 /* -90 is our -BIGNUM. Below we use -99 to mark "EOF on read",
9908 * pungetc() may increment it a few times.
9909 * Assuming it won't increment it to less than -90.
9911 if (g_parsefile->left_in_line < -90 || g_parsefile->buf == NULL) {
9912 pgetc_debug("preadbuffer PEOF1");
9913 /* even in failure keep left_in_line and next_to_pgetc
9914 * in lock step, for correct multi-layer pungetc.
9915 * left_in_line was decremented before preadbuffer(),
9916 * must inc next_to_pgetc: */
9917 g_parsefile->next_to_pgetc++;
9921 more = g_parsefile->left_in_buffer;
9923 flush_stdout_stderr();
9927 /* don't try reading again */
9928 g_parsefile->left_in_line = -99;
9929 pgetc_debug("preadbuffer PEOF2");
9930 g_parsefile->next_to_pgetc++;
9935 /* Find out where's the end of line.
9936 * Set g_parsefile->left_in_line
9937 * and g_parsefile->left_in_buffer acordingly.
9938 * NUL chars are deleted.
9940 q = g_parsefile->next_to_pgetc;
9948 memmove(q, q + 1, more);
9952 g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1;
9958 g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1;
9959 if (g_parsefile->left_in_line < 0)
9964 g_parsefile->left_in_buffer = more;
9969 out2str(g_parsefile->next_to_pgetc);
9973 pgetc_debug("preadbuffer at %d:%p'%s'",
9974 g_parsefile->left_in_line,
9975 g_parsefile->next_to_pgetc,
9976 g_parsefile->next_to_pgetc);
9977 return (unsigned char)*g_parsefile->next_to_pgetc++;
9983 g_parsefile->linno++;
9984 setprompt_if(doprompt, 2);
9989 g_parsefile->linno++;
9990 needprompt = doprompt;
9998 pgetc_debug("pgetc at %d:%p'%s'",
9999 g_parsefile->left_in_line,
10000 g_parsefile->next_to_pgetc,
10001 g_parsefile->next_to_pgetc);
10002 if (g_parsefile->unget)
10003 return g_parsefile->lastc[--g_parsefile->unget];
10005 if (--g_parsefile->left_in_line >= 0)
10006 c = (signed char)*g_parsefile->next_to_pgetc++;
10010 g_parsefile->lastc[1] = g_parsefile->lastc[0];
10011 g_parsefile->lastc[0] = c;
10016 #if ENABLE_ASH_ALIAS
10018 pgetc_without_PEOA(void)
10022 pgetc_debug("pgetc at %d:%p'%s'",
10023 g_parsefile->left_in_line,
10024 g_parsefile->next_to_pgetc,
10025 g_parsefile->next_to_pgetc);
10027 } while (c == PEOA);
10031 # define pgetc_without_PEOA() pgetc()
10035 * Read a line from the script.
10038 pfgets(char *line, int len)
10044 while (--nleft > 0) {
10045 c = pgetc_without_PEOA();
10060 * Undo a call to pgetc. Only two characters may be pushed back.
10061 * PEOF may be pushed back.
10066 g_parsefile->unget++;
10069 /* This one eats backslash+newline */
10075 while ((c = pgetc()) == '\\') {
10076 if (pgetc() != '\n') {
10088 * To handle the "." command, a stack of input files is used. Pushfile
10089 * adds a new entry to the stack and popfile restores the previous level.
10094 struct parsefile *pf;
10096 pf = ckzalloc(sizeof(*pf));
10097 pf->prev = g_parsefile;
10099 /*pf->strpush = NULL; - ckzalloc did it */
10100 /*pf->basestrpush.prev = NULL;*/
10108 struct parsefile *pf = g_parsefile;
10111 if (pf->pf_fd >= 0)
10114 while (pf->strpush)
10116 g_parsefile = pf->prev;
10122 * Return to top level.
10127 while (g_parsefile != &basepf)
10132 * Close the file(s) that the shell is reading commands from. Called
10133 * after a fork is done.
10139 if (g_parsefile->pf_fd > 0) {
10140 close(g_parsefile->pf_fd);
10141 g_parsefile->pf_fd = 0;
10146 * Like setinputfile, but takes an open file descriptor. Call this with
10150 setinputfd(int fd, int push)
10154 g_parsefile->buf = NULL;
10156 g_parsefile->pf_fd = fd;
10157 if (g_parsefile->buf == NULL)
10158 g_parsefile->buf = ckmalloc(IBUFSIZ);
10159 g_parsefile->left_in_buffer = 0;
10160 g_parsefile->left_in_line = 0;
10161 g_parsefile->linno = 1;
10165 * Set the input to take input from a file. If push is set, push the
10166 * old input onto the stack first.
10169 setinputfile(const char *fname, int flags)
10174 fd = open(fname, O_RDONLY);
10176 if (flags & INPUT_NOFILE_OK)
10179 ash_msg_and_raise_error("can't open '%s'", fname);
10184 close_on_exec_on(fd);
10185 setinputfd(fd, flags & INPUT_PUSH_FILE);
10192 * Like setinputfile, but takes input from a string.
10195 setinputstring(char *string)
10199 g_parsefile->next_to_pgetc = string;
10200 g_parsefile->left_in_line = strlen(string);
10201 g_parsefile->buf = NULL;
10202 g_parsefile->linno = 1;
10208 * Routines to check for mail.
10211 #if ENABLE_ASH_MAIL
10213 /* Hash of mtimes of mailboxes */
10214 static unsigned mailtime_hash;
10215 /* Set if MAIL or MAILPATH is changed. */
10216 static smallint mail_var_path_changed;
10219 * Print appropriate message(s) if mail has arrived.
10220 * If mail_var_path_changed is set,
10221 * then the value of MAIL has mail_var_path_changed,
10222 * so we just update the values.
10231 struct stackmark smark;
10234 setstackmark(&smark);
10235 mpath = mpathset() ? mpathval() : mailval();
10238 p = path_advance(&mpath, nullstr);
10243 for (q = p; *q; q++)
10249 q[-1] = '\0'; /* delete trailing '/' */
10250 if (stat(p, &statb) < 0) {
10253 /* Very simplistic "hash": just a sum of all mtimes */
10254 new_hash += (unsigned)statb.st_mtime;
10256 if (!mail_var_path_changed && mailtime_hash != new_hash) {
10257 if (mailtime_hash != 0)
10258 out2str("you have mail\n");
10259 mailtime_hash = new_hash;
10261 mail_var_path_changed = 0;
10262 popstackmark(&smark);
10265 static void FAST_FUNC
10266 changemail(const char *val UNUSED_PARAM)
10268 mail_var_path_changed = 1;
10271 #endif /* ASH_MAIL */
10274 /* ============ ??? */
10277 * Set the shell parameters.
10280 setparam(char **argv)
10286 for (nparam = 0; argv[nparam]; nparam++)
10288 ap = newparam = ckmalloc((nparam + 1) * sizeof(*ap));
10290 *ap++ = ckstrdup(*argv++);
10293 freeparam(&shellparam);
10294 shellparam.malloced = 1;
10295 shellparam.nparam = nparam;
10296 shellparam.p = newparam;
10297 #if ENABLE_ASH_GETOPTS
10298 shellparam.optind = 1;
10299 shellparam.optoff = -1;
10304 * Process shell options. The global variable argptr contains a pointer
10305 * to the argument list; we advance it past the options.
10307 * SUSv3 section 2.8.1 "Consequences of Shell Errors" says:
10308 * For a non-interactive shell, an error condition encountered
10309 * by a special built-in ... shall cause the shell to write a diagnostic message
10310 * to standard error and exit as shown in the following table:
10311 * Error Special Built-In
10313 * Utility syntax error (option or operand error) Shall exit
10315 * However, in bug 1142 (http://busybox.net/bugs/view.php?id=1142)
10316 * we see that bash does not do that (set "finishes" with error code 1 instead,
10317 * and shell continues), and people rely on this behavior!
10319 * set -o barfoo 2>/dev/null
10322 * Oh well. Let's mimic that.
10325 plus_minus_o(char *name, int val)
10330 for (i = 0; i < NOPTS; i++) {
10331 if (strcmp(name, optnames(i)) == 0) {
10336 ash_msg("illegal option %co %s", val ? '-' : '+', name);
10339 for (i = 0; i < NOPTS; i++) {
10341 out1fmt("%-16s%s\n", optnames(i), optlist[i] ? "on" : "off");
10343 out1fmt("set %co %s\n", optlist[i] ? '-' : '+', optnames(i));
10349 setoption(int flag, int val)
10353 for (i = 0; i < NOPTS; i++) {
10354 if (optletters(i) == flag) {
10359 ash_msg_and_raise_error("illegal option %c%c", val ? '-' : '+', flag);
10363 options(int cmdline)
10371 while ((p = *argptr) != NULL) {
10373 if (c != '-' && c != '+')
10376 val = 0; /* val = 0 if c == '+' */
10379 if (p[0] == '\0' || LONE_DASH(p)) {
10381 /* "-" means turn off -x and -v */
10384 /* "--" means reset params */
10385 else if (*argptr == NULL)
10388 break; /* "-" or "--" terminates options */
10391 /* first char was + or - */
10392 while ((c = *p++) != '\0') {
10393 /* bash 3.2 indeed handles -c CMD and +c CMD the same */
10394 if (c == 'c' && cmdline) {
10395 minusc = p; /* command is after shell args */
10396 } else if (c == 'o') {
10397 if (plus_minus_o(*argptr, val)) {
10398 /* it already printed err message */
10399 return 1; /* error */
10403 } else if (cmdline && (c == 'l')) { /* -l or +l == --login */
10405 /* bash does not accept +-login, we also won't */
10406 } else if (cmdline && val && (c == '-')) { /* long options */
10407 if (strcmp(p, "login") == 0)
10419 * The shift builtin command.
10421 static int FAST_FUNC
10422 shiftcmd(int argc UNUSED_PARAM, char **argv)
10429 n = number(argv[1]);
10430 if (n > shellparam.nparam)
10431 n = 0; /* bash compat, was = shellparam.nparam; */
10433 shellparam.nparam -= n;
10434 for (ap1 = shellparam.p; --n >= 0; ap1++) {
10435 if (shellparam.malloced)
10438 ap2 = shellparam.p;
10439 while ((*ap2++ = *ap1++) != NULL)
10441 #if ENABLE_ASH_GETOPTS
10442 shellparam.optind = 1;
10443 shellparam.optoff = -1;
10450 * POSIX requires that 'set' (but not export or readonly) output the
10451 * variables in lexicographic order - by the locale's collating order (sigh).
10452 * Maybe we could keep them in an ordered balanced binary tree
10453 * instead of hashed lists.
10454 * For now just roll 'em through qsort for printing...
10457 showvars(const char *sep_prefix, int on, int off)
10460 char **ep, **epend;
10462 ep = listvars(on, off, &epend);
10463 qsort(ep, epend - ep, sizeof(char *), vpcmp);
10465 sep = *sep_prefix ? " " : sep_prefix;
10467 for (; ep < epend; ep++) {
10471 p = strchrnul(*ep, '=');
10474 q = single_quote(++p);
10475 out1fmt("%s%s%.*s%s\n", sep_prefix, sep, (int)(p - *ep), *ep, q);
10481 * The set command builtin.
10483 static int FAST_FUNC
10484 setcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
10489 return showvars(nullstr, 0, VUNSET);
10492 retval = options(/*cmdline:*/ 0);
10493 if (retval == 0) { /* if no parse error... */
10495 if (*argptr != NULL) {
10503 #if ENABLE_ASH_RANDOM_SUPPORT
10504 static void FAST_FUNC
10505 change_random(const char *value)
10509 if (value == NULL) {
10510 /* "get", generate */
10511 t = next_random(&random_gen);
10512 /* set without recursion */
10513 setvar(vrandom.var_text, utoa(t), VNOFUNC);
10514 vrandom.flags &= ~VNOFUNC;
10517 t = strtoul(value, NULL, 10);
10518 INIT_RANDOM_T(&random_gen, (t ? t : 1), t);
10523 #if ENABLE_ASH_GETOPTS
10525 getopts(char *optstr, char *optvar, char **optfirst)
10532 int ind = shellparam.optind;
10533 int off = shellparam.optoff;
10537 shellparam.optind = -1;
10538 optnext = optfirst + ind - 1;
10540 if (ind <= 1 || off < 0 || (int)strlen(optnext[-1]) < off)
10543 p = optnext[-1] + off;
10544 if (p == NULL || *p == '\0') {
10545 /* Current word is done, advance */
10547 if (p == NULL || *p != '-' || *++p == '\0') {
10554 if (LONE_DASH(p)) /* check for "--" */
10559 for (q = optstr; *q != c;) {
10561 if (optstr[0] == ':') {
10563 /*sbuf[1] = '\0'; - already is */
10564 setvar0("OPTARG", sbuf);
10566 fprintf(stderr, "Illegal option -%c\n", c);
10567 unsetvar("OPTARG");
10577 if (*p == '\0' && (p = *optnext) == NULL) {
10578 if (optstr[0] == ':') {
10580 /*sbuf[1] = '\0'; - already is */
10581 setvar0("OPTARG", sbuf);
10584 fprintf(stderr, "No arg for -%c option\n", c);
10585 unsetvar("OPTARG");
10593 setvar0("OPTARG", p);
10596 setvar0("OPTARG", nullstr);
10598 ind = optnext - optfirst + 1;
10599 setvar("OPTIND", itoa(ind), VNOFUNC);
10601 /*sbuf[1] = '\0'; - already is */
10602 setvar0(optvar, sbuf);
10604 shellparam.optoff = p ? p - *(optnext - 1) : -1;
10605 shellparam.optind = ind;
10611 * The getopts builtin. Shellparam.optnext points to the next argument
10612 * to be processed. Shellparam.optptr points to the next character to
10613 * be processed in the current argument. If shellparam.optnext is NULL,
10614 * then it's the first time getopts has been called.
10616 static int FAST_FUNC
10617 getoptscmd(int argc, char **argv)
10622 ash_msg_and_raise_error("usage: getopts optstring var [arg]");
10624 optbase = shellparam.p;
10625 if ((unsigned)shellparam.optind > shellparam.nparam + 1) {
10626 shellparam.optind = 1;
10627 shellparam.optoff = -1;
10630 optbase = &argv[3];
10631 if ((unsigned)shellparam.optind > argc - 2) {
10632 shellparam.optind = 1;
10633 shellparam.optoff = -1;
10637 return getopts(argv[1], argv[2], optbase);
10639 #endif /* ASH_GETOPTS */
10642 /* ============ Shell parser */
10645 struct heredoc *next; /* next here document in list */
10646 union node *here; /* redirection node */
10647 char *eofmark; /* string indicating end of input */
10648 smallint striptabs; /* if set, strip leading tabs */
10651 static smallint tokpushback; /* last token pushed back */
10652 static smallint quoteflag; /* set if (part of) last token was quoted */
10653 static token_id_t lasttoken; /* last token read (integer id Txxx) */
10654 static struct heredoc *heredoclist; /* list of here documents to read */
10655 static char *wordtext; /* text of last word returned by readtoken */
10656 static struct nodelist *backquotelist;
10657 static union node *redirnode;
10658 static struct heredoc *heredoc;
10660 static const char *
10661 tokname(char *buf, int tok)
10664 return tokname_array[tok];
10665 sprintf(buf, "\"%s\"", tokname_array[tok]);
10669 /* raise_error_unexpected_syntax:
10670 * Called when an unexpected token is read during the parse. The argument
10671 * is the token that is expected, or -1 if more than one type of token can
10672 * occur at this point.
10674 static void raise_error_unexpected_syntax(int) NORETURN;
10676 raise_error_unexpected_syntax(int token)
10682 l = sprintf(msg, "unexpected %s", tokname(buf, lasttoken));
10684 sprintf(msg + l, " (expecting %s)", tokname(buf, token));
10685 raise_error_syntax(msg);
10689 #define EOFMARKLEN 79
10691 /* parsing is heavily cross-recursive, need these forward decls */
10692 static union node *andor(void);
10693 static union node *pipeline(void);
10694 static union node *parse_command(void);
10695 static void parseheredoc(void);
10696 static int peektoken(void);
10697 static int readtoken(void);
10699 static union node *
10702 union node *n1, *n2, *n3;
10707 switch (peektoken()) {
10715 if (!n1 && (nlflag & 1))
10721 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10722 if (nlflag == 2 && ((1 << peektoken()) & tokendlist))
10728 if (tok == TBACKGND) {
10729 if (n2->type == NPIPE) {
10730 n2->npipe.pipe_backgnd = 1;
10732 if (n2->type != NREDIR) {
10733 n3 = stzalloc(sizeof(struct nredir));
10735 /*n3->nredir.redirect = NULL; - stzalloc did it */
10738 n2->type = NBACKGND;
10744 n3 = stzalloc(sizeof(struct nbinary));
10746 n3->nbinary.ch1 = n1;
10747 n3->nbinary.ch2 = n2;
10760 raise_error_unexpected_syntax(-1);
10767 static union node *
10770 union node *n1, *n2, *n3;
10778 } else if (t == TOR) {
10784 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10786 n3 = stzalloc(sizeof(struct nbinary));
10788 n3->nbinary.ch1 = n1;
10789 n3->nbinary.ch2 = n2;
10794 static union node *
10797 union node *n1, *n2, *pipenode;
10798 struct nodelist *lp, *prev;
10802 TRACE(("pipeline: entered\n"));
10803 if (readtoken() == TNOT) {
10805 checkkwd = CHKKWD | CHKALIAS;
10808 n1 = parse_command();
10809 if (readtoken() == TPIPE) {
10810 pipenode = stzalloc(sizeof(struct npipe));
10811 pipenode->type = NPIPE;
10812 /*pipenode->npipe.pipe_backgnd = 0; - stzalloc did it */
10813 lp = stzalloc(sizeof(struct nodelist));
10814 pipenode->npipe.cmdlist = lp;
10818 lp = stzalloc(sizeof(struct nodelist));
10819 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10820 lp->n = parse_command();
10822 } while (readtoken() == TPIPE);
10828 n2 = stzalloc(sizeof(struct nnot));
10836 static union node *
10841 n = stzalloc(sizeof(struct narg));
10843 /*n->narg.next = NULL; - stzalloc did it */
10844 n->narg.text = wordtext;
10845 n->narg.backquote = backquotelist;
10850 fixredir(union node *n, const char *text, int err)
10854 TRACE(("Fix redir %s %d\n", text, err));
10856 n->ndup.vname = NULL;
10858 fd = bb_strtou(text, NULL, 10);
10859 if (!errno && fd >= 0)
10860 n->ndup.dupfd = fd;
10861 else if (LONE_DASH(text))
10862 n->ndup.dupfd = -1;
10865 raise_error_syntax("bad fd number");
10866 n->ndup.vname = makename();
10871 * Returns true if the text contains nothing to expand (no dollar signs
10875 noexpand(const char *text)
10879 while ((c = *text++) != '\0') {
10880 if (c == CTLQUOTEMARK)
10884 else if (SIT(c, BASESYNTAX) == CCTL)
10893 union node *n = redirnode;
10895 if (readtoken() != TWORD)
10896 raise_error_unexpected_syntax(-1);
10897 if (n->type == NHERE) {
10898 struct heredoc *here = heredoc;
10902 if (quoteflag == 0)
10904 TRACE(("Here document %d\n", n->type));
10905 if (!noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN)
10906 raise_error_syntax("illegal eof marker for << redirection");
10907 rmescapes(wordtext, 0);
10908 here->eofmark = wordtext;
10910 if (heredoclist == NULL)
10911 heredoclist = here;
10913 for (p = heredoclist; p->next; p = p->next)
10917 } else if (n->type == NTOFD || n->type == NFROMFD) {
10918 fixredir(n, wordtext, 0);
10920 n->nfile.fname = makename();
10924 static union node *
10927 union node *args, **app;
10928 union node *n = NULL;
10929 union node *vars, **vpp;
10930 union node **rpp, *redir;
10932 #if ENABLE_ASH_BASH_COMPAT
10933 smallint double_brackets_flag = 0;
10934 smallint function_flag = 0;
10944 savecheckkwd = CHKALIAS;
10947 checkkwd = savecheckkwd;
10950 #if ENABLE_ASH_BASH_COMPAT
10952 if (peektoken() != TWORD)
10953 raise_error_unexpected_syntax(TWORD);
10956 case TAND: /* "&&" */
10957 case TOR: /* "||" */
10958 if (!double_brackets_flag) {
10962 wordtext = (char *) (t == TAND ? "-a" : "-o");
10965 n = stzalloc(sizeof(struct narg));
10967 /*n->narg.next = NULL; - stzalloc did it */
10968 n->narg.text = wordtext;
10969 #if ENABLE_ASH_BASH_COMPAT
10970 if (strcmp("[[", wordtext) == 0)
10971 double_brackets_flag = 1;
10972 else if (strcmp("]]", wordtext) == 0)
10973 double_brackets_flag = 0;
10975 n->narg.backquote = backquotelist;
10976 if (savecheckkwd && isassignment(wordtext)) {
10978 vpp = &n->narg.next;
10981 app = &n->narg.next;
10984 #if ENABLE_ASH_BASH_COMPAT
10985 if (function_flag) {
10986 checkkwd = CHKNL | CHKKWD;
10987 switch (peektoken()) {
10999 if (strcmp("[[", wordtext) == 0)
11003 raise_error_unexpected_syntax(-1);
11009 *rpp = n = redirnode;
11010 rpp = &n->nfile.next;
11011 parsefname(); /* read name of redirection file */
11014 IF_ASH_BASH_COMPAT(do_func:)
11015 if (args && app == &args->narg.next
11018 struct builtincmd *bcmd;
11021 /* We have a function */
11022 if (IF_ASH_BASH_COMPAT(!function_flag &&) readtoken() != TRP)
11023 raise_error_unexpected_syntax(TRP);
11024 name = n->narg.text;
11025 if (!goodname(name)
11026 || ((bcmd = find_builtin(name)) && IS_BUILTIN_SPECIAL(bcmd))
11028 raise_error_syntax("bad function name");
11031 checkkwd = CHKNL | CHKKWD | CHKALIAS;
11032 n->narg.next = parse_command();
11035 IF_ASH_BASH_COMPAT(function_flag = 0;)
11046 n = stzalloc(sizeof(struct ncmd));
11048 n->ncmd.args = args;
11049 n->ncmd.assign = vars;
11050 n->ncmd.redirect = redir;
11054 static union node *
11055 parse_command(void)
11057 union node *n1, *n2;
11058 union node *ap, **app;
11059 union node *cp, **cpp;
11060 union node *redir, **rpp;
11067 switch (readtoken()) {
11069 raise_error_unexpected_syntax(-1);
11072 n1 = stzalloc(sizeof(struct nif));
11074 n1->nif.test = list(0);
11075 if (readtoken() != TTHEN)
11076 raise_error_unexpected_syntax(TTHEN);
11077 n1->nif.ifpart = list(0);
11079 while (readtoken() == TELIF) {
11080 n2->nif.elsepart = stzalloc(sizeof(struct nif));
11081 n2 = n2->nif.elsepart;
11083 n2->nif.test = list(0);
11084 if (readtoken() != TTHEN)
11085 raise_error_unexpected_syntax(TTHEN);
11086 n2->nif.ifpart = list(0);
11088 if (lasttoken == TELSE)
11089 n2->nif.elsepart = list(0);
11091 n2->nif.elsepart = NULL;
11099 n1 = stzalloc(sizeof(struct nbinary));
11100 n1->type = (lasttoken == TWHILE) ? NWHILE : NUNTIL;
11101 n1->nbinary.ch1 = list(0);
11104 TRACE(("expecting DO got '%s' %s\n", tokname_array[got],
11105 got == TWORD ? wordtext : ""));
11106 raise_error_unexpected_syntax(TDO);
11108 n1->nbinary.ch2 = list(0);
11113 if (readtoken() != TWORD || quoteflag || !goodname(wordtext))
11114 raise_error_syntax("bad for loop variable");
11115 n1 = stzalloc(sizeof(struct nfor));
11117 n1->nfor.var = wordtext;
11118 checkkwd = CHKNL | CHKKWD | CHKALIAS;
11119 if (readtoken() == TIN) {
11121 while (readtoken() == TWORD) {
11122 n2 = stzalloc(sizeof(struct narg));
11124 /*n2->narg.next = NULL; - stzalloc did it */
11125 n2->narg.text = wordtext;
11126 n2->narg.backquote = backquotelist;
11128 app = &n2->narg.next;
11131 n1->nfor.args = ap;
11132 if (lasttoken != TNL && lasttoken != TSEMI)
11133 raise_error_unexpected_syntax(-1);
11135 n2 = stzalloc(sizeof(struct narg));
11137 /*n2->narg.next = NULL; - stzalloc did it */
11138 n2->narg.text = (char *)dolatstr;
11139 /*n2->narg.backquote = NULL;*/
11140 n1->nfor.args = n2;
11142 * Newline or semicolon here is optional (but note
11143 * that the original Bourne shell only allowed NL).
11145 if (lasttoken != TSEMI)
11148 checkkwd = CHKNL | CHKKWD | CHKALIAS;
11149 if (readtoken() != TDO)
11150 raise_error_unexpected_syntax(TDO);
11151 n1->nfor.body = list(0);
11155 n1 = stzalloc(sizeof(struct ncase));
11157 if (readtoken() != TWORD)
11158 raise_error_unexpected_syntax(TWORD);
11159 n1->ncase.expr = n2 = stzalloc(sizeof(struct narg));
11161 /*n2->narg.next = NULL; - stzalloc did it */
11162 n2->narg.text = wordtext;
11163 n2->narg.backquote = backquotelist;
11164 checkkwd = CHKNL | CHKKWD | CHKALIAS;
11165 if (readtoken() != TIN)
11166 raise_error_unexpected_syntax(TIN);
11167 cpp = &n1->ncase.cases;
11169 checkkwd = CHKNL | CHKKWD;
11171 while (t != TESAC) {
11172 if (lasttoken == TLP)
11174 *cpp = cp = stzalloc(sizeof(struct nclist));
11176 app = &cp->nclist.pattern;
11178 *app = ap = stzalloc(sizeof(struct narg));
11180 /*ap->narg.next = NULL; - stzalloc did it */
11181 ap->narg.text = wordtext;
11182 ap->narg.backquote = backquotelist;
11183 if (readtoken() != TPIPE)
11185 app = &ap->narg.next;
11188 //ap->narg.next = NULL;
11189 if (lasttoken != TRP)
11190 raise_error_unexpected_syntax(TRP);
11191 cp->nclist.body = list(2);
11193 cpp = &cp->nclist.next;
11195 checkkwd = CHKNL | CHKKWD;
11199 raise_error_unexpected_syntax(TENDCASE);
11206 n1 = stzalloc(sizeof(struct nredir));
11207 n1->type = NSUBSHELL;
11208 n1->nredir.n = list(0);
11209 /*n1->nredir.redirect = NULL; - stzalloc did it */
11216 IF_ASH_BASH_COMPAT(case TFUNCTION:)
11220 return simplecmd();
11223 if (readtoken() != t)
11224 raise_error_unexpected_syntax(t);
11227 /* Now check for redirection which may follow command */
11228 checkkwd = CHKKWD | CHKALIAS;
11230 while (readtoken() == TREDIR) {
11231 *rpp = n2 = redirnode;
11232 rpp = &n2->nfile.next;
11238 if (n1->type != NSUBSHELL) {
11239 n2 = stzalloc(sizeof(struct nredir));
11244 n1->nredir.redirect = redir;
11249 #if ENABLE_ASH_BASH_COMPAT
11251 decode_dollar_squote(void)
11253 static const char C_escapes[] ALIGN1 = "nrbtfav""x\\01234567";
11259 p = strchr(C_escapes, c);
11264 if ((unsigned char)(c - '0') <= 7) { /* \ooo */
11268 } while ((unsigned char)(c - '0') <= 7 && --cnt);
11270 } else if (c == 'x') { /* \xHH */
11274 } while (isxdigit(c) && --cnt);
11276 if (cnt == 3) { /* \x but next char is "bad" */
11280 } else { /* simple seq like \\ or \t */
11285 c = bb_process_escape_sequence((void*)&p);
11286 } else { /* unrecognized "\z": print both chars unless ' or " */
11287 if (c != '\'' && c != '"') {
11289 c |= 0x100; /* "please encode \, then me" */
11297 * If eofmark is NULL, read a word or a redirection symbol. If eofmark
11298 * is not NULL, read a here document. In the latter case, eofmark is the
11299 * word which marks the end of the document and striptabs is true if
11300 * leading tabs should be stripped from the document. The argument c
11301 * is the first character of the input token or document.
11303 * Because C does not have internal subroutines, I have simulated them
11304 * using goto's to implement the subroutine linkage. The following macros
11305 * will run code that appears at the end of readtoken1.
11307 #define CHECKEND() {goto checkend; checkend_return:;}
11308 #define PARSEREDIR() {goto parseredir; parseredir_return:;}
11309 #define PARSESUB() {goto parsesub; parsesub_return:;}
11310 #define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;}
11311 #define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;}
11312 #define PARSEARITH() {goto parsearith; parsearith_return:;}
11314 readtoken1(int c, int syntax, char *eofmark, int striptabs)
11316 /* NB: syntax parameter fits into smallint */
11317 /* c parameter is an unsigned char or PEOF or PEOA */
11320 char line[EOFMARKLEN + 1];
11321 struct nodelist *bqlist;
11325 smallint prevsyntax; /* syntax before arithmetic */
11326 #if ENABLE_ASH_EXPAND_PRMT
11327 smallint pssyntax; /* we are expanding a prompt string */
11329 int varnest; /* levels of variables expansion */
11330 int arinest; /* levels of arithmetic expansion */
11331 int parenlevel; /* levels of parens in arithmetic */
11332 int dqvarnest; /* levels of variables expansion within double quotes */
11334 IF_ASH_BASH_COMPAT(smallint bash_dollar_squote = 0;)
11336 startlinno = g_parsefile->linno;
11340 #if ENABLE_ASH_EXPAND_PRMT
11341 pssyntax = (syntax == PSSYNTAX);
11345 dblquote = (syntax == DQSYNTAX);
11351 STARTSTACKSTR(out);
11353 /* For each line, until end of word */
11354 CHECKEND(); /* set c to PEOF if at end of here document */
11355 for (;;) { /* until end of line or end of word */
11356 CHECKSTRSPACE(4, out); /* permit 4 calls to USTPUTC */
11357 switch (SIT(c, syntax)) {
11358 case CNL: /* '\n' */
11359 if (syntax == BASESYNTAX)
11360 goto endword; /* exit outer loop */
11364 goto loop; /* continue outer loop */
11369 #if ENABLE_ASH_BASH_COMPAT
11370 if (c == '\\' && bash_dollar_squote) {
11371 c = decode_dollar_squote();
11373 /* skip $'\000', $'\x00' (like bash) */
11377 /* Unknown escape. Encode as '\z' */
11378 c = (unsigned char)c;
11379 if (eofmark == NULL || dblquote)
11380 USTPUTC(CTLESC, out);
11381 USTPUTC('\\', out);
11385 if (eofmark == NULL || dblquote)
11386 USTPUTC(CTLESC, out);
11389 case CBACK: /* backslash */
11390 c = pgetc_without_PEOA();
11392 USTPUTC(CTLESC, out);
11393 USTPUTC('\\', out);
11395 } else if (c == '\n') {
11398 #if ENABLE_ASH_EXPAND_PRMT
11399 if (c == '$' && pssyntax) {
11400 USTPUTC(CTLESC, out);
11401 USTPUTC('\\', out);
11404 /* Backslash is retained if we are in "str" and next char isn't special */
11409 && (c != '"' || eofmark != NULL)
11411 USTPUTC('\\', out);
11413 USTPUTC(CTLESC, out);
11421 if (eofmark == NULL) {
11422 USTPUTC(CTLQUOTEMARK, out);
11430 IF_ASH_BASH_COMPAT(bash_dollar_squote = 0;)
11431 if (eofmark != NULL && varnest == 0) {
11434 if (dqvarnest == 0) {
11435 syntax = BASESYNTAX;
11442 case CVAR: /* '$' */
11443 PARSESUB(); /* parse substitution */
11445 case CENDVAR: /* '}' */
11448 if (dqvarnest > 0) {
11455 #if ENABLE_SH_MATH_SUPPORT
11456 case CLP: /* '(' in arithmetic */
11460 case CRP: /* ')' in arithmetic */
11461 if (parenlevel > 0) {
11464 if (pgetc_eatbnl() == ')') {
11466 if (--arinest == 0) {
11467 syntax = prevsyntax;
11471 * unbalanced parens
11472 * (don't 2nd guess - no error)
11480 case CBQUOTE: /* '`' */
11484 goto endword; /* exit outer loop */
11488 if (varnest == 0) {
11489 #if ENABLE_ASH_BASH_COMPAT
11491 //Can't call pgetc_eatbnl() here, this requires three-deep pungetc()
11492 if (pgetc() == '>')
11493 c = 0x100 + '>'; /* flag &> */
11497 goto endword; /* exit outer loop */
11499 IF_ASH_ALIAS(if (c != PEOA))
11506 #if ENABLE_SH_MATH_SUPPORT
11507 if (syntax == ARISYNTAX)
11508 raise_error_syntax("missing '))'");
11510 if (syntax != BASESYNTAX && eofmark == NULL)
11511 raise_error_syntax("unterminated quoted string");
11512 if (varnest != 0) {
11513 startlinno = g_parsefile->linno;
11515 raise_error_syntax("missing '}'");
11517 USTPUTC('\0', out);
11518 len = out - (char *)stackblock();
11519 out = stackblock();
11520 if (eofmark == NULL) {
11521 if ((c == '>' || c == '<' IF_ASH_BASH_COMPAT( || c == 0x100 + '>'))
11524 if (isdigit_str9(out)) {
11525 PARSEREDIR(); /* passed as params: out, c */
11526 lasttoken = TREDIR;
11529 /* else: non-number X seen, interpret it
11530 * as "NNNX>file" = "NNNX >file" */
11534 quoteflag = quotef;
11535 backquotelist = bqlist;
11536 grabstackblock(len);
11540 /* end of readtoken routine */
11543 * Check to see whether we are at the end of the here document. When this
11544 * is called, c is set to the first character of the next input line. If
11545 * we are at the end of the here document, this routine sets the c to PEOF.
11549 #if ENABLE_ASH_ALIAS
11551 c = pgetc_without_PEOA();
11554 while (c == '\t') {
11555 c = pgetc_without_PEOA();
11558 if (c == *eofmark) {
11559 if (pfgets(line, sizeof(line)) != NULL) {
11564 for (q = eofmark + 1;; p++, q++) {
11568 if (!*q || cc != *q)
11575 pushstring(line, NULL);
11580 goto checkend_return;
11584 * Parse a redirection operator. The variable "out" points to a string
11585 * specifying the fd to be redirected. The variable "c" contains the
11586 * first character of the redirection operator.
11589 /* out is already checked to be a valid number or "" */
11590 int fd = (*out == '\0' ? -1 : atoi(out));
11593 np = stzalloc(sizeof(struct nfile));
11598 np->type = NAPPEND;
11600 np->type = NCLOBBER;
11603 /* it also can be NTO2 (>&file), but we can't figure it out yet */
11609 #if ENABLE_ASH_BASH_COMPAT
11610 else if (c == 0x100 + '>') { /* this flags &> redirection */
11612 pgetc(); /* this is '>', no need to check */
11616 else { /* c == '<' */
11617 /*np->nfile.fd = 0; - stzalloc did it */
11621 if (sizeof(struct nfile) != sizeof(struct nhere)) {
11622 np = stzalloc(sizeof(struct nhere));
11623 /*np->nfile.fd = 0; - stzalloc did it */
11626 heredoc = stzalloc(sizeof(struct heredoc));
11627 heredoc->here = np;
11630 heredoc->striptabs = 1;
11632 /*heredoc->striptabs = 0; - stzalloc did it */
11638 np->type = NFROMFD;
11642 np->type = NFROMTO;
11654 goto parseredir_return;
11658 * Parse a substitution. At this point, we have read the dollar sign
11659 * and nothing else.
11662 /* is_special(c) evaluates to 1 for c in "!#$*-0123456789?@"; 0 otherwise
11663 * (assuming ascii char codes, as the original implementation did) */
11664 #define is_special(c) \
11665 (((unsigned)(c) - 33 < 32) \
11666 && ((0xc1ff920dU >> ((unsigned)(c) - 33)) & 1))
11668 unsigned char subtype;
11671 c = pgetc_eatbnl();
11672 if (c > 255 /* PEOA or PEOF */
11673 || (c != '(' && c != '{' && !is_name(c) && !is_special(c))
11675 #if ENABLE_ASH_BASH_COMPAT
11676 if (syntax != DQSYNTAX && c == '\'')
11677 bash_dollar_squote = 1;
11682 } else if (c == '(') {
11683 /* $(command) or $((arith)) */
11684 if (pgetc_eatbnl() == '(') {
11685 #if ENABLE_SH_MATH_SUPPORT
11688 raise_error_syntax("you disabled math support for $((arith)) syntax");
11695 /* $VAR, $<specialchar>, ${...}, or PEOA/PEOF */
11696 USTPUTC(CTLVAR, out);
11697 typeloc = out - (char *)stackblock();
11699 subtype = VSNORMAL;
11701 c = pgetc_eatbnl();
11706 /* $[{[#]]NAME[}] */
11709 c = pgetc_eatbnl();
11710 } while (is_in_name(c));
11711 } else if (isdigit(c)) {
11712 /* $[{[#]]NUM[}] */
11715 c = pgetc_eatbnl();
11716 } while (isdigit(c));
11717 } else if (is_special(c)) {
11718 /* $[{[#]]<specialchar>[}] */
11721 c = pgetc_eatbnl();
11722 if (!subtype && cc == '#') {
11723 subtype = VSLENGTH;
11724 if (c == '_' || isalnum(c))
11727 c = pgetc_eatbnl();
11728 if (cc == '}' || c != '}') {
11739 if (c != '}' && subtype == VSLENGTH) {
11740 /* ${#VAR didn't end with } */
11744 if (subtype == 0) {
11745 static const char types[] ALIGN1 = "}-+?=";
11746 /* ${VAR...} but not $VAR or ${#VAR} */
11747 /* c == first char after VAR */
11750 c = pgetc_eatbnl();
11751 #if ENABLE_ASH_BASH_COMPAT
11752 /* This check is only needed to not misinterpret
11753 * ${VAR:-WORD}, ${VAR:+WORD}, ${VAR:=WORD}, ${VAR:?WORD}
11756 if (!strchr(types, c)) {
11757 subtype = VSSUBSTR;
11759 break; /* "goto badsub" is bigger (!) */
11765 const char *p = strchr(types, c);
11768 subtype |= p - types + VSNORMAL;
11774 subtype = (c == '#' ? VSTRIMLEFT : VSTRIMRIGHT);
11775 c = pgetc_eatbnl();
11781 #if ENABLE_ASH_BASH_COMPAT
11783 /* ${v/[/]pattern/repl} */
11784 //TODO: encode pattern and repl separately.
11785 // Currently ${v/$var_with_slash/repl} is horribly broken
11786 subtype = VSREPLACE;
11787 c = pgetc_eatbnl();
11790 subtype++; /* VSREPLACEALL */
11798 ((unsigned char *)stackblock())[typeloc] = subtype;
11799 if (subtype != VSNORMAL) {
11806 goto parsesub_return;
11810 * Called to parse command substitutions. Newstyle is set if the command
11811 * is enclosed inside $(...); nlpp is a pointer to the head of the linked
11812 * list of commands (passed by reference), and savelen is the number of
11813 * characters on the top of the stack which must be preserved.
11816 struct nodelist **nlpp;
11820 smallint saveprompt = 0;
11823 savelen = out - (char *)stackblock();
11826 * FIXME: this can allocate very large block on stack and SEGV.
11828 * echo "..<100kbytes>..`true` $(true) `true` ..."
11829 * allocates 100kb for every command subst. With about
11830 * a hundred command substitutions stack overflows.
11831 * With larger prepended string, SEGV happens sooner.
11833 str = alloca(savelen);
11834 memcpy(str, stackblock(), savelen);
11838 /* We must read until the closing backquote, giving special
11839 * treatment to some slashes, and then push the string and
11840 * reread it as input, interpreting it normally.
11846 STARTSTACKSTR(pout);
11850 setprompt_if(needprompt, 2);
11861 * If eating a newline, avoid putting
11862 * the newline into the new character
11863 * stream (via the STPUTC after the
11868 if (pc != '\\' && pc != '`' && pc != '$'
11869 && (!dblquote || pc != '"')
11871 STPUTC('\\', pout);
11873 if (pc <= 255 /* not PEOA or PEOF */) {
11879 IF_ASH_ALIAS(case PEOA:)
11880 startlinno = g_parsefile->linno;
11881 raise_error_syntax("EOF in backquote substitution");
11893 STPUTC('\0', pout);
11894 psavelen = pout - (char *)stackblock();
11895 if (psavelen > 0) {
11896 pstr = grabstackstr(pout);
11897 setinputstring(pstr);
11902 nlpp = &(*nlpp)->next;
11903 *nlpp = stzalloc(sizeof(**nlpp));
11904 /* (*nlpp)->next = NULL; - stzalloc did it */
11907 saveprompt = doprompt;
11914 doprompt = saveprompt;
11915 else if (readtoken() != TRP)
11916 raise_error_unexpected_syntax(TRP);
11921 * Start reading from old file again, ignoring any pushed back
11922 * tokens left from the backquote parsing
11927 while (stackblocksize() <= savelen)
11929 STARTSTACKSTR(out);
11931 memcpy(out, str, savelen);
11932 STADJUST(savelen, out);
11934 USTPUTC(CTLBACKQ, out);
11936 goto parsebackq_oldreturn;
11937 goto parsebackq_newreturn;
11940 #if ENABLE_SH_MATH_SUPPORT
11942 * Parse an arithmetic expansion (indicate start of one and set state)
11945 if (++arinest == 1) {
11946 prevsyntax = syntax;
11947 syntax = ARISYNTAX;
11949 USTPUTC(CTLARI, out);
11950 goto parsearith_return;
11953 } /* end of readtoken */
11956 * Read the next input token.
11957 * If the token is a word, we set backquotelist to the list of cmds in
11958 * backquotes. We set quoteflag to true if any part of the word was
11960 * If the token is TREDIR, then we set redirnode to a structure containing
11962 * In all cases, the variable startlinno is set to the number of the line
11963 * on which the token starts.
11965 * [Change comment: here documents and internal procedures]
11966 * [Readtoken shouldn't have any arguments. Perhaps we should make the
11967 * word parsing code into a separate routine. In this case, readtoken
11968 * doesn't need to have any internal procedures, but parseword does.
11969 * We could also make parseoperator in essence the main routine, and
11970 * have parseword (readtoken1?) handle both words and redirection.]
11972 #define NEW_xxreadtoken
11973 #ifdef NEW_xxreadtoken
11974 /* singles must be first! */
11975 static const char xxreadtoken_chars[7] ALIGN1 = {
11976 '\n', '(', ')', /* singles */
11977 '&', '|', ';', /* doubles */
11981 #define xxreadtoken_singles 3
11982 #define xxreadtoken_doubles 3
11984 static const char xxreadtoken_tokens[] ALIGN1 = {
11985 TNL, TLP, TRP, /* only single occurrence allowed */
11986 TBACKGND, TPIPE, TSEMI, /* if single occurrence */
11987 TEOF, /* corresponds to trailing nul */
11988 TAND, TOR, TENDCASE /* if double occurrence */
12000 setprompt_if(needprompt, 2);
12001 startlinno = g_parsefile->linno;
12002 for (;;) { /* until token or start of word found */
12004 if (c == ' ' || c == '\t' IF_ASH_ALIAS( || c == PEOA))
12008 while ((c = pgetc()) != '\n' && c != PEOF)
12011 } else if (c == '\\') {
12012 if (pgetc() != '\n') {
12014 break; /* return readtoken1(...) */
12020 p = xxreadtoken_chars + sizeof(xxreadtoken_chars) - 1;
12026 p = strchr(xxreadtoken_chars, c);
12028 break; /* return readtoken1(...) */
12030 if ((int)(p - xxreadtoken_chars) >= xxreadtoken_singles) {
12032 if (cc == c) { /* double occurrence? */
12033 p += xxreadtoken_doubles + 1;
12036 #if ENABLE_ASH_BASH_COMPAT
12037 if (c == '&' && cc == '>') /* &> */
12038 break; /* return readtoken1(...) */
12043 lasttoken = xxreadtoken_tokens[p - xxreadtoken_chars];
12048 return readtoken1(c, BASESYNTAX, (char *) NULL, 0);
12050 #else /* old xxreadtoken */
12051 #define RETURN(token) return lasttoken = token
12061 setprompt_if(needprompt, 2);
12062 startlinno = g_parsefile->linno;
12063 for (;;) { /* until token or start of word found */
12066 case ' ': case '\t':
12067 IF_ASH_ALIAS(case PEOA:)
12070 while ((c = pgetc()) != '\n' && c != PEOF)
12075 if (pgetc() == '\n') {
12087 if (pgetc() == '&')
12092 if (pgetc() == '|')
12097 if (pgetc() == ';')
12110 return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
12113 #endif /* old xxreadtoken */
12119 int kwd = checkkwd;
12121 smallint alreadyseen = tokpushback;
12124 #if ENABLE_ASH_ALIAS
12140 if (t != TWORD || quoteflag) {
12145 * check for keywords
12147 if (kwd & CHKKWD) {
12148 const char *const *pp;
12150 pp = findkwd(wordtext);
12152 lasttoken = t = pp - tokname_array;
12153 TRACE(("keyword '%s' recognized\n", tokname_array[t]));
12158 if (checkkwd & CHKALIAS) {
12159 #if ENABLE_ASH_ALIAS
12161 ap = lookupalias(wordtext, 1);
12164 pushstring(ap->val, ap);
12174 TRACE(("token '%s' %s\n", tokname_array[t], t == TWORD ? wordtext : ""));
12176 TRACE(("reread token '%s' %s\n", tokname_array[t], t == TWORD ? wordtext : ""));
12192 * Read and parse a command. Returns NODE_EOF on end of file.
12193 * (NULL is a valid parse tree indicating a blank line.)
12195 static union node *
12196 parsecmd(int interact)
12201 doprompt = interact;
12202 setprompt_if(doprompt, doprompt);
12208 * Input any here documents.
12213 struct heredoc *here;
12216 here = heredoclist;
12217 heredoclist = NULL;
12220 setprompt_if(needprompt, 2);
12221 readtoken1(pgetc(), here->here->type == NHERE ? SQSYNTAX : DQSYNTAX,
12222 here->eofmark, here->striptabs);
12223 n = stzalloc(sizeof(struct narg));
12224 n->narg.type = NARG;
12225 /*n->narg.next = NULL; - stzalloc did it */
12226 n->narg.text = wordtext;
12227 n->narg.backquote = backquotelist;
12228 here->here->nhere.doc = n;
12235 * called by editline -- any expansions to the prompt should be added here.
12237 #if ENABLE_ASH_EXPAND_PRMT
12238 static const char *
12239 expandstr(const char *ps)
12244 /* XXX Fix (char *) cast. It _is_ a bug. ps is variable's value,
12245 * and token processing _can_ alter it (delete NULs etc). */
12246 setinputstring((char *)ps);
12248 saveprompt = doprompt;
12250 readtoken1(pgetc(), PSSYNTAX, nullstr, 0);
12251 doprompt = saveprompt;
12255 n.narg.type = NARG;
12256 n.narg.next = NULL;
12257 n.narg.text = wordtext;
12258 n.narg.backquote = backquotelist;
12260 expandarg(&n, NULL, EXP_QUOTED);
12261 return stackblock();
12266 * Execute a command or commands contained in a string.
12269 evalstring(char *s, int flags)
12272 struct stackmark smark;
12277 setstackmark(&smark);
12280 while ((n = parsecmd(0)) != NODE_EOF) {
12283 i = evaltree(n, flags);
12286 popstackmark(&smark);
12290 popstackmark(&smark);
12298 * The eval command.
12300 static int FAST_FUNC
12301 evalcmd(int argc UNUSED_PARAM, char **argv, int flags)
12310 STARTSTACKSTR(concat);
12312 concat = stack_putstr(p, concat);
12316 STPUTC(' ', concat);
12318 STPUTC('\0', concat);
12319 p = grabstackstr(concat);
12321 return evalstring(p, flags & EV_TESTED);
12327 * Read and execute commands.
12328 * "Top" is nonzero for the top level command loop;
12329 * it turns on prompting if the shell is interactive.
12335 struct stackmark smark;
12340 TRACE(("cmdloop(%d) called\n", top));
12344 setstackmark(&smark);
12347 showjobs(SHOW_CHANGED|SHOW_STDERR);
12350 if (iflag && top) {
12354 n = parsecmd(inter);
12356 if (DEBUG > 2 && debug && (n != NODE_EOF))
12359 if (n == NODE_EOF) {
12360 if (!top || numeof >= 50)
12362 if (!stoppedjobs()) {
12365 out2str("\nUse \"exit\" to leave shell.\n");
12368 } else if (nflag == 0) {
12371 /* job_warning can only be 2,1,0. Here 2->1, 1/0->0 */
12374 i = evaltree(n, 0);
12378 popstackmark(&smark);
12382 evalskip &= ~SKIPFUNC;
12390 * Take commands from a file. To be compatible we should do a path
12391 * search for the file, which is necessary to find sub-commands.
12394 find_dot_file(char *name)
12397 const char *path = pathval();
12400 /* don't try this for absolute or relative paths */
12401 if (strchr(name, '/'))
12404 /* IIRC standards do not say whether . is to be searched.
12405 * And it is even smaller this way, making it unconditional for now:
12407 if (1) { /* ENABLE_ASH_BASH_COMPAT */
12412 while ((fullname = path_advance(&path, name)) != NULL) {
12414 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
12416 * Don't bother freeing here, since it will
12417 * be freed by the caller.
12421 if (fullname != name)
12422 stunalloc(fullname);
12425 /* not found in the PATH */
12426 ash_msg_and_raise_error("%s: not found", name);
12430 static int FAST_FUNC
12431 dotcmd(int argc_ UNUSED_PARAM, char **argv_ UNUSED_PARAM)
12433 /* "false; . empty_file; echo $?" should print 0, not 1: */
12437 struct strlist *sp;
12438 volatile struct shparam saveparam;
12440 for (sp = cmdenviron; sp; sp = sp->next)
12441 setvareq(ckstrdup(sp->text), VSTRFIXED | VTEXTFIXED);
12443 nextopt(nullstr); /* handle possible "--" */
12447 /* bash says: "bash: .: filename argument required" */
12448 return 2; /* bash compat */
12451 /* This aborts if file isn't found, which is POSIXly correct.
12452 * bash returns exitcode 1 instead.
12454 fullname = find_dot_file(argv[0]);
12456 if (argv[0]) { /* . FILE ARGS, ARGS exist */
12458 saveparam = shellparam;
12459 shellparam.malloced = 0;
12463 shellparam.nparam = argc;
12464 shellparam.p = argv;
12467 /* This aborts if file can't be opened, which is POSIXly correct.
12468 * bash returns exitcode 1 instead.
12470 setinputfile(fullname, INPUT_PUSH_FILE);
12471 commandname = fullname;
12472 status = cmdloop(0);
12476 freeparam(&shellparam);
12477 shellparam = saveparam;
12483 static int FAST_FUNC
12484 exitcmd(int argc UNUSED_PARAM, char **argv)
12489 exitstatus = number(argv[1]);
12490 raise_exception(EXEXIT);
12495 * Read a file containing shell functions.
12498 readcmdfile(char *name)
12500 setinputfile(name, INPUT_PUSH_FILE);
12506 /* ============ find_command inplementation */
12509 * Resolve a command name. If you change this routine, you may have to
12510 * change the shellexec routine as well.
12513 find_command(char *name, struct cmdentry *entry, int act, const char *path)
12515 struct tblentry *cmdp;
12522 struct builtincmd *bcmd;
12524 /* If name contains a slash, don't use PATH or hash table */
12525 if (strchr(name, '/') != NULL) {
12526 entry->u.index = -1;
12527 if (act & DO_ABS) {
12528 while (stat(name, &statb) < 0) {
12530 if (errno == EINTR)
12533 entry->cmdtype = CMDUNKNOWN;
12537 entry->cmdtype = CMDNORMAL;
12541 /* #if ENABLE_FEATURE_SH_STANDALONE... moved after builtin check */
12543 updatetbl = (path == pathval());
12546 if (strstr(path, "%builtin") != NULL)
12547 act |= DO_ALTBLTIN;
12550 /* If name is in the table, check answer will be ok */
12551 cmdp = cmdlookup(name, 0);
12552 if (cmdp != NULL) {
12555 switch (cmdp->cmdtype) {
12573 } else if (cmdp->rehash == 0)
12574 /* if not invalidated by cd, we're done */
12578 /* If %builtin not in path, check for builtin next */
12579 bcmd = find_builtin(name);
12581 if (IS_BUILTIN_REGULAR(bcmd))
12582 goto builtin_success;
12583 if (act & DO_ALTPATH) {
12584 if (!(act & DO_ALTBLTIN))
12585 goto builtin_success;
12586 } else if (builtinloc <= 0) {
12587 goto builtin_success;
12591 #if ENABLE_FEATURE_SH_STANDALONE
12593 int applet_no = find_applet_by_name(name);
12594 if (applet_no >= 0) {
12595 entry->cmdtype = CMDNORMAL;
12596 entry->u.index = -2 - applet_no;
12602 /* We have to search path. */
12603 prev = -1; /* where to start */
12604 if (cmdp && cmdp->rehash) { /* doing a rehash */
12605 if (cmdp->cmdtype == CMDBUILTIN)
12608 prev = cmdp->param.index;
12614 while ((fullname = path_advance(&path, name)) != NULL) {
12615 stunalloc(fullname);
12616 /* NB: code below will still use fullname
12617 * despite it being "unallocated" */
12620 if (prefix(pathopt, "builtin")) {
12622 goto builtin_success;
12625 if ((act & DO_NOFUNC)
12626 || !prefix(pathopt, "func")
12627 ) { /* ignore unimplemented options */
12631 /* if rehash, don't redo absolute path names */
12632 if (fullname[0] == '/' && idx <= prev) {
12635 TRACE(("searchexec \"%s\": no change\n", name));
12638 while (stat(fullname, &statb) < 0) {
12640 if (errno == EINTR)
12643 if (errno != ENOENT && errno != ENOTDIR)
12647 e = EACCES; /* if we fail, this will be the error */
12648 if (!S_ISREG(statb.st_mode))
12650 if (pathopt) { /* this is a %func directory */
12651 stalloc(strlen(fullname) + 1);
12652 /* NB: stalloc will return space pointed by fullname
12653 * (because we don't have any intervening allocations
12654 * between stunalloc above and this stalloc) */
12655 readcmdfile(fullname);
12656 cmdp = cmdlookup(name, 0);
12657 if (cmdp == NULL || cmdp->cmdtype != CMDFUNCTION)
12658 ash_msg_and_raise_error("%s not defined in %s", name, fullname);
12659 stunalloc(fullname);
12662 TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
12664 entry->cmdtype = CMDNORMAL;
12665 entry->u.index = idx;
12669 cmdp = cmdlookup(name, 1);
12670 cmdp->cmdtype = CMDNORMAL;
12671 cmdp->param.index = idx;
12676 /* We failed. If there was an entry for this command, delete it */
12677 if (cmdp && updatetbl)
12678 delete_cmd_entry();
12680 ash_msg("%s: %s", name, errmsg(e, "not found"));
12681 entry->cmdtype = CMDUNKNOWN;
12686 entry->cmdtype = CMDBUILTIN;
12687 entry->u.cmd = bcmd;
12691 cmdp = cmdlookup(name, 1);
12692 cmdp->cmdtype = CMDBUILTIN;
12693 cmdp->param.cmd = bcmd;
12697 entry->cmdtype = cmdp->cmdtype;
12698 entry->u = cmdp->param;
12703 * The trap builtin.
12705 static int FAST_FUNC
12706 trapcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12710 int signo, exitcode;
12715 for (signo = 0; signo < NSIG; signo++) {
12716 char *tr = trap_ptr[signo];
12718 /* note: bash adds "SIG", but only if invoked
12719 * as "bash". If called as "sh", or if set -o posix,
12720 * then it prints short signal names.
12721 * We are printing short names: */
12722 out1fmt("trap -- %s %s\n",
12724 get_signame(signo));
12725 /* trap_ptr != trap only if we are in special-cased `trap` code.
12726 * In this case, we will exit very soon, no need to free(). */
12727 /* if (trap_ptr != trap && tp[0]) */
12732 if (trap_ptr != trap) {
12745 signo = get_signum(*ap);
12747 /* Mimic bash message exactly */
12748 ash_msg("%s: invalid signal specification", *ap);
12754 if (LONE_DASH(action))
12757 if (action[0]) /* not NULL and not "" and not "-" */
12758 may_have_traps = 1;
12759 action = ckstrdup(action);
12763 trap[signo] = action;
12774 /* ============ Builtins */
12776 #if ENABLE_ASH_HELP
12777 static int FAST_FUNC
12778 helpcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12784 "Built-in commands:\n"
12785 "------------------\n");
12786 for (col = 0, i = 0; i < ARRAY_SIZE(builtintab); i++) {
12787 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '),
12788 builtintab[i].name + 1);
12794 # if ENABLE_FEATURE_SH_STANDALONE
12796 const char *a = applet_names;
12798 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '), a);
12803 while (*a++ != '\0')
12808 newline_and_flush(stdout);
12809 return EXIT_SUCCESS;
12814 static int FAST_FUNC
12815 historycmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12817 show_history(line_input_state);
12818 return EXIT_SUCCESS;
12823 * The export and readonly commands.
12825 static int FAST_FUNC
12826 exportcmd(int argc UNUSED_PARAM, char **argv)
12836 /* "readonly" in bash accepts, but ignores -n.
12837 * We do the same: it saves a conditional in nextopt's param.
12840 while ((opt = nextopt("np")) != '\0') {
12842 flag_off = VEXPORT;
12845 if (argv[0][0] == 'r') {
12847 flag_off = 0; /* readonly ignores -n */
12849 flag_off = ~flag_off;
12851 /*if (opt_p_not_specified) - bash doesnt check this. Try "export -p NAME" */
12857 p = strchr(name, '=');
12861 vp = *findvar(hashvar(name), name);
12863 vp->flags = ((vp->flags | flag) & flag_off);
12867 setvar(name, p, (flag & flag_off));
12868 } while ((name = *++aptr) != NULL);
12873 /* No arguments. Show the list of exported or readonly vars.
12876 showvars(argv[0], flag, 0);
12881 * Delete a function if it exists.
12884 unsetfunc(const char *name)
12886 struct tblentry *cmdp;
12888 cmdp = cmdlookup(name, 0);
12889 if (cmdp != NULL && cmdp->cmdtype == CMDFUNCTION)
12890 delete_cmd_entry();
12894 * The unset builtin command. We unset the function before we unset the
12895 * variable to allow a function to be unset when there is a readonly variable
12896 * with the same name.
12898 static int FAST_FUNC
12899 unsetcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12906 while ((i = nextopt("vf")) != 0) {
12910 for (ap = argptr; *ap; ap++) {
12923 static const unsigned char timescmd_str[] ALIGN1 = {
12924 ' ', offsetof(struct tms, tms_utime),
12925 '\n', offsetof(struct tms, tms_stime),
12926 ' ', offsetof(struct tms, tms_cutime),
12927 '\n', offsetof(struct tms, tms_cstime),
12930 static int FAST_FUNC
12931 timescmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12933 unsigned long clk_tck, s, t;
12934 const unsigned char *p;
12937 clk_tck = bb_clk_tck();
12942 t = *(clock_t *)(((char *) &buf) + p[1]);
12945 out1fmt("%lum%lu.%03lus%c",
12947 (t * 1000) / clk_tck,
12955 #if ENABLE_SH_MATH_SUPPORT
12957 * The let builtin. Partially stolen from GNU Bash, the Bourne Again SHell.
12958 * Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
12960 * Copyright (C) 2003 Vladimir Oleynik <dzo@simtreas.ru>
12962 static int FAST_FUNC
12963 letcmd(int argc UNUSED_PARAM, char **argv)
12969 ash_msg_and_raise_error("expression expected");
12971 i = ash_arith(*argv);
12979 * The read builtin. Options:
12980 * -r Do not interpret '\' specially
12981 * -s Turn off echo (tty only)
12982 * -n NCHARS Read NCHARS max
12983 * -p PROMPT Display PROMPT on stderr (if input is from tty)
12984 * -t SECONDS Timeout after SECONDS (tty or pipe only)
12985 * -u FD Read from given FD instead of fd 0
12986 * This uses unbuffered input, which may be avoidable in some cases.
12987 * TODO: bash also has:
12988 * -a ARRAY Read into array[0],[1],etc
12989 * -d DELIM End on DELIM char, not newline
12990 * -e Use line editing (tty only)
12992 static int FAST_FUNC
12993 readcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12995 char *opt_n = NULL;
12996 char *opt_p = NULL;
12997 char *opt_t = NULL;
12998 char *opt_u = NULL;
12999 int read_flags = 0;
13003 while ((i = nextopt("p:u:rt:n:s")) != '\0') {
13012 read_flags |= BUILTIN_READ_SILENT;
13018 read_flags |= BUILTIN_READ_RAW;
13028 /* "read -s" needs to save/restore termios, can't allow ^C
13029 * to jump out of it.
13032 r = shell_builtin_read(setvar0,
13034 bltinlookup("IFS"), /* can be NULL */
13043 if ((uintptr_t)r > 1)
13044 ash_msg_and_raise_error(r);
13046 return (uintptr_t)r;
13049 static int FAST_FUNC
13050 umaskcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
13052 static const char permuser[3] ALIGN1 = "ogu";
13055 int symbolic_mode = 0;
13057 while (nextopt("S") != '\0') {
13066 if (*argptr == NULL) {
13067 if (symbolic_mode) {
13068 char buf[sizeof(",u=rwx,g=rwx,o=rwx")];
13075 *p++ = permuser[i];
13077 /* mask is 0..0uuugggooo. i=2 selects uuu bits */
13078 if (!(mask & 0400)) *p++ = 'r';
13079 if (!(mask & 0200)) *p++ = 'w';
13080 if (!(mask & 0100)) *p++ = 'x';
13088 out1fmt("%04o\n", mask);
13091 char *modestr = *argptr;
13092 /* numeric umasks are taken as-is */
13093 /* symbolic umasks are inverted: "umask a=rx" calls umask(222) */
13094 if (!isdigit(modestr[0]))
13096 mask = bb_parse_mode(modestr, mask);
13097 if ((unsigned)mask > 0777) {
13098 ash_msg_and_raise_error("illegal mode: %s", modestr);
13100 if (!isdigit(modestr[0]))
13107 static int FAST_FUNC
13108 ulimitcmd(int argc UNUSED_PARAM, char **argv)
13110 return shell_builtin_ulimit(argv);
13113 /* ============ main() and helpers */
13116 * Called to exit the shell.
13125 #if ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
13126 save_history(line_input_state);
13128 status = exitstatus;
13129 TRACE(("pid %d, exitshell(%d)\n", getpid(), status));
13130 if (setjmp(loc.loc)) {
13131 if (exception_type == EXEXIT)
13132 status = exitstatus;
13135 exception_handler = &loc;
13141 /*free(p); - we'll exit soon */
13144 /* dash wraps setjobctl(0) in "if (setjmp(loc.loc) == 0) {...}".
13145 * our setjobctl(0) does not panic if tcsetpgrp fails inside it.
13148 flush_stdout_stderr();
13156 /* we will never free this */
13157 basepf.next_to_pgetc = basepf.buf = ckmalloc(IBUFSIZ);
13159 signal(SIGCHLD, SIG_DFL);
13160 /* bash re-enables SIGHUP which is SIG_IGNed on entry.
13161 * Try: "trap '' HUP; bash; echo RET" and type "kill -HUP $$"
13163 signal(SIGHUP, SIG_DFL);
13168 struct stat st1, st2;
13171 for (envp = environ; envp && *envp; envp++) {
13172 p = endofname(*envp);
13173 if (p != *envp && *p == '=') {
13174 setvareq(*envp, VEXPORT|VTEXTFIXED);
13178 setvareq((char*)defoptindvar, VTEXTFIXED);
13180 setvar0("PPID", utoa(getppid()));
13181 #if ENABLE_ASH_BASH_COMPAT
13182 p = lookupvar("SHLVL");
13183 setvar("SHLVL", utoa((p ? atoi(p) : 0) + 1), VEXPORT);
13184 if (!lookupvar("HOSTNAME")) {
13185 struct utsname uts;
13187 setvar0("HOSTNAME", uts.nodename);
13190 p = lookupvar("PWD");
13192 if (p[0] != '/' || stat(p, &st1) || stat(".", &st2)
13193 || st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino
13203 //usage:#define ash_trivial_usage
13204 //usage: "[-/+OPTIONS] [-/+o OPT]... [-c 'SCRIPT' [ARG0 [ARGS]] / FILE [ARGS]]"
13205 //usage:#define ash_full_usage "\n\n"
13206 //usage: "Unix shell interpreter"
13208 //usage:#if ENABLE_FEATURE_SH_IS_ASH
13209 //usage:# define sh_trivial_usage ash_trivial_usage
13210 //usage:# define sh_full_usage ash_full_usage
13212 //usage:#if ENABLE_FEATURE_BASH_IS_ASH
13213 //usage:# define bash_trivial_usage ash_trivial_usage
13214 //usage:# define bash_full_usage ash_full_usage
13218 * Process the shell command line arguments.
13221 procargs(char **argv)
13224 const char *xminusc;
13229 /* if (xargv[0]) - mmm, this is always true! */
13231 for (i = 0; i < NOPTS; i++)
13234 if (options(/*cmdline:*/ 1)) {
13235 /* it already printed err message */
13236 raise_exception(EXERROR);
13240 if (*xargv == NULL) {
13242 ash_msg_and_raise_error(bb_msg_requires_arg, "-c");
13245 if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
13249 for (i = 0; i < NOPTS; i++)
13250 if (optlist[i] == 2)
13255 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
13260 } else if (!sflag) {
13261 setinputfile(*xargv, 0);
13264 commandname = arg0;
13267 shellparam.p = xargv;
13268 #if ENABLE_ASH_GETOPTS
13269 shellparam.optind = 1;
13270 shellparam.optoff = -1;
13272 /* assert(shellparam.malloced == 0 && shellparam.nparam == 0); */
13274 shellparam.nparam++;
13281 * Read /etc/profile, ~/.profile, $ENV.
13284 read_profile(const char *name)
13286 name = expandstr(name);
13287 if (setinputfile(name, INPUT_PUSH_FILE | INPUT_NOFILE_OK) < 0)
13294 * This routine is called when an error or an interrupt occurs in an
13295 * interactive shell and control is returned to the main command loop.
13303 /* from input.c: */
13304 g_parsefile->left_in_buffer = 0;
13305 g_parsefile->left_in_line = 0; /* clear input buffer */
13307 /* from parser.c: */
13310 /* from redir.c: */
13312 popredir(/*drop:*/ 0, /*restore:*/ 0);
13316 static short profile_buf[16384];
13317 extern int etext();
13321 * Main routine. We initialize things, parse the arguments, execute
13322 * profiles if we're a login shell, and then call cmdloop to execute
13323 * commands. The setjmp call sets up the location to jump to when an
13324 * exception occurs. When an exception occurs the variable "state"
13325 * is used to figure out how far we had gotten.
13327 int ash_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
13328 int ash_main(int argc UNUSED_PARAM, char **argv)
13330 volatile smallint state;
13331 struct jmploc jmploc;
13332 struct stackmark smark;
13334 /* Initialize global data */
13338 #if ENABLE_ASH_ALIAS
13344 monitor(4, etext, profile_buf, sizeof(profile_buf), 50);
13347 #if ENABLE_FEATURE_EDITING
13348 line_input_state = new_line_input_t(FOR_SHELL | WITH_PATH_LOOKUP);
13351 if (setjmp(jmploc.loc)) {
13357 e = exception_type;
13359 if (e == EXEXIT || s == 0 || iflag == 0 || shlvl) {
13363 newline_and_flush(stderr);
13366 popstackmark(&smark);
13367 FORCE_INT_ON; /* enable interrupts */
13376 exception_handler = &jmploc;
13379 TRACE(("Shell args: "));
13380 trace_puts_args(argv);
13382 rootpid = getpid();
13385 setstackmark(&smark);
13388 if (argv[0] && argv[0][0] == '-')
13394 read_profile("/etc/profile");
13397 hp = lookupvar("HOME");
13399 read_profile("$HOME/.profile");
13405 getuid() == geteuid() && getgid() == getegid() &&
13409 const char *shinit = lookupvar("ENV");
13410 if (shinit != NULL && *shinit != '\0')
13411 read_profile(shinit);
13413 popstackmark(&smark);
13417 /* evalstring pushes parsefile stack.
13418 * Ensure we don't falsely claim that 0 (stdin)
13419 * is one of stacked source fds.
13420 * Testcase: ash -c 'exec 1>&0' must not complain. */
13421 // if (!sflag) g_parsefile->pf_fd = -1;
13422 // ^^ not necessary since now we special-case fd 0
13423 // in is_hidden_fd() to not be considered "hidden fd"
13424 evalstring(minusc, 0);
13427 if (sflag || minusc == NULL) {
13428 #if MAX_HISTORY > 0 && ENABLE_FEATURE_EDITING_SAVEHISTORY
13430 const char *hp = lookupvar("HISTFILE");
13432 hp = lookupvar("HOME");
13434 hp = concat_path_file(hp, ".ash_history");
13435 setvar0("HISTFILE", hp);
13437 hp = lookupvar("HISTFILE");
13441 line_input_state->hist_file = hp;
13442 # if ENABLE_FEATURE_SH_HISTFILESIZE
13443 hp = lookupvar("HISTFILESIZE");
13444 line_input_state->max_history = size_from_HISTFILESIZE(hp);
13448 state4: /* XXX ??? - why isn't this before the "if" statement */
13456 extern void _mcleanup(void);
13460 TRACE(("End of main reached\n"));
13467 * Copyright (c) 1989, 1991, 1993, 1994
13468 * The Regents of the University of California. All rights reserved.
13470 * This code is derived from software contributed to Berkeley by
13471 * Kenneth Almquist.
13473 * Redistribution and use in source and binary forms, with or without
13474 * modification, are permitted provided that the following conditions
13476 * 1. Redistributions of source code must retain the above copyright
13477 * notice, this list of conditions and the following disclaimer.
13478 * 2. Redistributions in binary form must reproduce the above copyright
13479 * notice, this list of conditions and the following disclaimer in the
13480 * documentation and/or other materials provided with the distribution.
13481 * 3. Neither the name of the University nor the names of its contributors
13482 * may be used to endorse or promote products derived from this software
13483 * without specific prior written permission.
13485 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
13486 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
13487 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
13488 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
13489 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
13490 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
13491 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
13492 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
13493 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
13494 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF