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)
1497 len = SHELL_ALIGN(len);
1499 g_stacknleft -= len;
1503 pushstackmark(struct stackmark *mark, size_t len)
1505 mark->stackp = g_stackp;
1506 mark->stacknxt = g_stacknxt;
1507 mark->stacknleft = g_stacknleft;
1508 grabstackblock(len);
1512 setstackmark(struct stackmark *mark)
1514 pushstackmark(mark, g_stacknxt == g_stackp->space && g_stackp != &stackbase);
1518 popstackmark(struct stackmark *mark)
1520 struct stack_block *sp;
1526 while (g_stackp != mark->stackp) {
1528 g_stackp = sp->prev;
1531 g_stacknxt = mark->stacknxt;
1532 g_stacknleft = mark->stacknleft;
1533 sstrend = mark->stacknxt + mark->stacknleft;
1538 * When the parser reads in a string, it wants to stick the string on the
1539 * stack and only adjust the stack pointer when it knows how big the
1540 * string is. Stackblock (defined in stack.h) returns a pointer to a block
1541 * of space on top of the stack and stackblocklen returns the length of
1542 * this block. Growstackblock will grow this space by at least one byte,
1543 * possibly moving it (like realloc). Grabstackblock actually allocates the
1544 * part of the block that has been used.
1547 growstackblock(void)
1551 newlen = g_stacknleft * 2;
1552 if (newlen < g_stacknleft)
1553 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1557 if (g_stacknxt == g_stackp->space && g_stackp != &stackbase) {
1558 struct stack_block *sp;
1559 struct stack_block *prevstackp;
1564 prevstackp = sp->prev;
1565 grosslen = newlen + sizeof(struct stack_block) - MINSIZE;
1566 sp = ckrealloc(sp, grosslen);
1567 sp->prev = prevstackp;
1569 g_stacknxt = sp->space;
1570 g_stacknleft = newlen;
1571 sstrend = sp->space + newlen;
1574 char *oldspace = g_stacknxt;
1575 size_t oldlen = g_stacknleft;
1576 char *p = stalloc(newlen);
1578 /* free the space we just allocated */
1579 g_stacknxt = memcpy(p, oldspace, oldlen);
1580 g_stacknleft += newlen;
1585 * The following routines are somewhat easier to use than the above.
1586 * The user declares a variable of type STACKSTR, which may be declared
1587 * to be a register. The macro STARTSTACKSTR initializes things. Then
1588 * the user uses the macro STPUTC to add characters to the string. In
1589 * effect, STPUTC(c, p) is the same as *p++ = c except that the stack is
1590 * grown as necessary. When the user is done, she can just leave the
1591 * string there and refer to it using stackblock(). Or she can allocate
1592 * the space for it using grabstackstr(). If it is necessary to allow
1593 * someone else to use the stack temporarily and then continue to grow
1594 * the string, the user should use grabstack to allocate the space, and
1595 * then call ungrabstr(p) to return to the previous mode of operation.
1597 * USTPUTC is like STPUTC except that it doesn't check for overflow.
1598 * CHECKSTACKSPACE can be called before USTPUTC to ensure that there
1599 * is space for at least one character.
1604 size_t len = stackblocksize();
1606 return (char *)stackblock() + len;
1610 * Called from CHECKSTRSPACE.
1613 makestrspace(size_t newlen, char *p)
1615 size_t len = p - g_stacknxt;
1621 size = stackblocksize();
1623 if (nleft >= newlen)
1627 return (char *)stackblock() + len;
1631 stack_nputstr(const char *s, size_t n, char *p)
1633 p = makestrspace(n, p);
1634 p = (char *)memcpy(p, s, n) + n;
1639 stack_putstr(const char *s, char *p)
1641 return stack_nputstr(s, strlen(s), p);
1645 _STPUTC(int c, char *p)
1653 #define STARTSTACKSTR(p) ((p) = stackblock())
1654 #define STPUTC(c, p) ((p) = _STPUTC((c), (p)))
1655 #define CHECKSTRSPACE(n, p) do { \
1658 size_t m = sstrend - q; \
1660 (p) = makestrspace(l, q); \
1662 #define USTPUTC(c, p) (*(p)++ = (c))
1663 #define STACKSTRNUL(p) do { \
1664 if ((p) == sstrend) \
1665 (p) = growstackstr(); \
1668 #define STUNPUTC(p) (--(p))
1669 #define STTOPC(p) ((p)[-1])
1670 #define STADJUST(amount, p) ((p) += (amount))
1672 #define grabstackstr(p) stalloc((char *)(p) - (char *)stackblock())
1673 #define ungrabstackstr(s, p) stunalloc(s)
1674 #define stackstrend() ((void *)sstrend)
1677 /* ============ String helpers */
1680 * prefix -- see if pfx is a prefix of string.
1683 prefix(const char *string, const char *pfx)
1686 if (*pfx++ != *string++)
1689 return (char *) string;
1693 * Check for a valid number. This should be elsewhere.
1696 is_number(const char *p)
1701 } while (*++p != '\0');
1706 * Convert a string of digits to an integer, printing an error message on
1710 number(const char *s)
1713 ash_msg_and_raise_error(msg_illnum, s);
1718 * Produce a possibly single quoted string suitable as input to the shell.
1719 * The return string is allocated on the stack.
1722 single_quote(const char *s)
1732 len = strchrnul(s, '\'') - s;
1734 q = p = makestrspace(len + 3, p);
1737 q = (char *)memcpy(q, s, len) + len;
1746 do len++; while (*++s == '\'');
1748 q = p = makestrspace(len + 3, p);
1751 q = (char *)memcpy(q, s - len, len) + len;
1759 return stackblock();
1763 /* ============ nextopt */
1765 static char **argptr; /* argument list for builtin commands */
1766 static char *optionarg; /* set by nextopt (like getopt) */
1767 static char *optptr; /* used by nextopt */
1770 * XXX - should get rid of. Have all builtins use getopt(3).
1771 * The library getopt must have the BSD extension static variable
1772 * "optreset", otherwise it can't be used within the shell safely.
1774 * Standard option processing (a la getopt) for builtin routines.
1775 * The only argument that is passed to nextopt is the option string;
1776 * the other arguments are unnecessary. It returns the character,
1777 * or '\0' on end of input.
1780 nextopt(const char *optstring)
1787 if (p == NULL || *p == '\0') {
1788 /* We ate entire "-param", take next one */
1794 if (*++p == '\0') /* just "-" ? */
1797 if (LONE_DASH(p)) /* "--" ? */
1799 /* p => next "-param" */
1801 /* p => some option char in the middle of a "-param" */
1803 for (q = optstring; *q != c;) {
1805 ash_msg_and_raise_error("illegal option -%c", c);
1813 ash_msg_and_raise_error("no arg for -%c option", c);
1823 /* ============ Shell variables */
1826 * The parsefile structure pointed to by the global variable parsefile
1827 * contains information about the current file being read.
1830 int nparam; /* # of positional parameters (without $0) */
1831 #if ENABLE_ASH_GETOPTS
1832 int optind; /* next parameter to be processed by getopts */
1833 int optoff; /* used by getopts */
1835 unsigned char malloced; /* if parameter list dynamically allocated */
1836 char **p; /* parameter list */
1840 * Free the list of positional parameters.
1843 freeparam(volatile struct shparam *param)
1845 if (param->malloced) {
1847 ap = ap1 = param->p;
1854 #if ENABLE_ASH_GETOPTS
1855 static void FAST_FUNC getoptsreset(const char *value);
1859 struct var *next; /* next entry in hash list */
1860 int flags; /* flags are defined above */
1861 const char *var_text; /* name=value */
1862 void (*var_func)(const char *) FAST_FUNC; /* function to be called when */
1863 /* the variable gets set/unset */
1867 struct localvar *next; /* next local variable in list */
1868 struct var *vp; /* the variable that was made local */
1869 int flags; /* saved flags */
1870 const char *text; /* saved text */
1874 #define VEXPORT 0x01 /* variable is exported */
1875 #define VREADONLY 0x02 /* variable cannot be modified */
1876 #define VSTRFIXED 0x04 /* variable struct is statically allocated */
1877 #define VTEXTFIXED 0x08 /* text is statically allocated */
1878 #define VSTACK 0x10 /* text is allocated on the stack */
1879 #define VUNSET 0x20 /* the variable is not set */
1880 #define VNOFUNC 0x40 /* don't call the callback function */
1881 #define VNOSET 0x80 /* do not set variable - just readonly test */
1882 #define VNOSAVE 0x100 /* when text is on the heap before setvareq */
1883 #if ENABLE_ASH_RANDOM_SUPPORT
1884 # define VDYNAMIC 0x200 /* dynamic variable */
1890 /* Need to be before varinit_data[] */
1891 #if ENABLE_LOCALE_SUPPORT
1892 static void FAST_FUNC
1893 change_lc_all(const char *value)
1895 if (value && *value != '\0')
1896 setlocale(LC_ALL, value);
1898 static void FAST_FUNC
1899 change_lc_ctype(const char *value)
1901 if (value && *value != '\0')
1902 setlocale(LC_CTYPE, value);
1906 static void chkmail(void);
1907 static void changemail(const char *var_value) FAST_FUNC;
1909 # define chkmail() ((void)0)
1911 static void changepath(const char *) FAST_FUNC;
1912 #if ENABLE_ASH_RANDOM_SUPPORT
1913 static void change_random(const char *) FAST_FUNC;
1916 static const struct {
1918 const char *var_text;
1919 void (*var_func)(const char *) FAST_FUNC;
1920 } varinit_data[] = {
1922 * Note: VEXPORT would not work correctly here for NOFORK applets:
1923 * some environment strings may be constant.
1925 { VSTRFIXED|VTEXTFIXED , defifsvar , NULL },
1927 { VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL" , changemail },
1928 { VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH" , changemail },
1930 { VSTRFIXED|VTEXTFIXED , bb_PATH_root_path, changepath },
1931 { VSTRFIXED|VTEXTFIXED , "PS1=$ " , NULL },
1932 { VSTRFIXED|VTEXTFIXED , "PS2=> " , NULL },
1933 { VSTRFIXED|VTEXTFIXED , "PS4=+ " , NULL },
1934 #if ENABLE_ASH_GETOPTS
1935 { VSTRFIXED|VTEXTFIXED , defoptindvar, getoptsreset },
1937 #if ENABLE_ASH_RANDOM_SUPPORT
1938 { VSTRFIXED|VTEXTFIXED|VUNSET|VDYNAMIC, "RANDOM", change_random },
1940 #if ENABLE_LOCALE_SUPPORT
1941 { VSTRFIXED|VTEXTFIXED|VUNSET, "LC_ALL" , change_lc_all },
1942 { VSTRFIXED|VTEXTFIXED|VUNSET, "LC_CTYPE" , change_lc_ctype },
1944 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
1945 { VSTRFIXED|VTEXTFIXED|VUNSET, "HISTFILE" , NULL },
1951 struct globals_var {
1952 struct shparam shellparam; /* $@ current positional parameters */
1953 struct redirtab *redirlist;
1954 int preverrout_fd; /* save fd2 before print debug if xflag is set. */
1955 struct var *vartab[VTABSIZE];
1956 struct var varinit[ARRAY_SIZE(varinit_data)];
1958 extern struct globals_var *const ash_ptr_to_globals_var;
1959 #define G_var (*ash_ptr_to_globals_var)
1960 #define shellparam (G_var.shellparam )
1961 //#define redirlist (G_var.redirlist )
1962 #define preverrout_fd (G_var.preverrout_fd)
1963 #define vartab (G_var.vartab )
1964 #define varinit (G_var.varinit )
1965 #define INIT_G_var() do { \
1967 (*(struct globals_var**)&ash_ptr_to_globals_var) = xzalloc(sizeof(G_var)); \
1969 for (i = 0; i < ARRAY_SIZE(varinit_data); i++) { \
1970 varinit[i].flags = varinit_data[i].flags; \
1971 varinit[i].var_text = varinit_data[i].var_text; \
1972 varinit[i].var_func = varinit_data[i].var_func; \
1976 #define vifs varinit[0]
1978 # define vmail (&vifs)[1]
1979 # define vmpath (&vmail)[1]
1980 # define vpath (&vmpath)[1]
1982 # define vpath (&vifs)[1]
1984 #define vps1 (&vpath)[1]
1985 #define vps2 (&vps1)[1]
1986 #define vps4 (&vps2)[1]
1987 #if ENABLE_ASH_GETOPTS
1988 # define voptind (&vps4)[1]
1989 # if ENABLE_ASH_RANDOM_SUPPORT
1990 # define vrandom (&voptind)[1]
1993 # if ENABLE_ASH_RANDOM_SUPPORT
1994 # define vrandom (&vps4)[1]
1999 * The following macros access the values of the above variables.
2000 * They have to skip over the name. They return the null string
2001 * for unset variables.
2003 #define ifsval() (vifs.var_text + 4)
2004 #define ifsset() ((vifs.flags & VUNSET) == 0)
2006 # define mailval() (vmail.var_text + 5)
2007 # define mpathval() (vmpath.var_text + 9)
2008 # define mpathset() ((vmpath.flags & VUNSET) == 0)
2010 #define pathval() (vpath.var_text + 5)
2011 #define ps1val() (vps1.var_text + 4)
2012 #define ps2val() (vps2.var_text + 4)
2013 #define ps4val() (vps4.var_text + 4)
2014 #if ENABLE_ASH_GETOPTS
2015 # define optindval() (voptind.var_text + 7)
2018 #if ENABLE_ASH_GETOPTS
2019 static void FAST_FUNC
2020 getoptsreset(const char *value)
2022 shellparam.optind = number(value) ?: 1;
2023 shellparam.optoff = -1;
2028 * Compares two strings up to the first = or '\0'. The first
2029 * string must be terminated by '='; the second may be terminated by
2030 * either '=' or '\0'.
2033 varcmp(const char *p, const char *q)
2037 while ((c = *p) == (d = *q)) {
2038 if (c == '\0' || c == '=')
2052 * Find the appropriate entry in the hash table from the name.
2054 static struct var **
2055 hashvar(const char *p)
2059 hashval = ((unsigned char) *p) << 4;
2060 while (*p && *p != '=')
2061 hashval += (unsigned char) *p++;
2062 return &vartab[hashval % VTABSIZE];
2066 vpcmp(const void *a, const void *b)
2068 return varcmp(*(const char **)a, *(const char **)b);
2072 * This routine initializes the builtin variables.
2082 * PS1 depends on uid
2084 #if ENABLE_FEATURE_EDITING && ENABLE_FEATURE_EDITING_FANCY_PROMPT
2085 vps1.var_text = "PS1=\\w \\$ ";
2088 vps1.var_text = "PS1=# ";
2091 end = vp + ARRAY_SIZE(varinit);
2093 vpp = hashvar(vp->var_text);
2096 } while (++vp < end);
2099 static struct var **
2100 findvar(struct var **vpp, const char *name)
2102 for (; *vpp; vpp = &(*vpp)->next) {
2103 if (varcmp((*vpp)->var_text, name) == 0) {
2111 * Find the value of a variable. Returns NULL if not set.
2113 static const char* FAST_FUNC
2114 lookupvar(const char *name)
2118 v = *findvar(hashvar(name), name);
2120 #if ENABLE_ASH_RANDOM_SUPPORT
2122 * Dynamic variables are implemented roughly the same way they are
2123 * in bash. Namely, they're "special" so long as they aren't unset.
2124 * As soon as they're unset, they're no longer dynamic, and dynamic
2125 * lookup will no longer happen at that point. -- PFM.
2127 if (v->flags & VDYNAMIC)
2130 if (!(v->flags & VUNSET))
2131 return var_end(v->var_text);
2137 reinit_unicode_for_ash(void)
2139 /* Unicode support should be activated even if LANG is set
2140 * _during_ shell execution, not only if it was set when
2141 * shell was started. Therefore, re-check LANG every time:
2143 if (ENABLE_FEATURE_CHECK_UNICODE_IN_ENV
2144 || ENABLE_UNICODE_USING_LOCALE
2146 const char *s = lookupvar("LC_ALL");
2147 if (!s) s = lookupvar("LC_CTYPE");
2148 if (!s) s = lookupvar("LANG");
2154 * Search the environment of a builtin command.
2157 bltinlookup(const char *name)
2161 for (sp = cmdenviron; sp; sp = sp->next) {
2162 if (varcmp(sp->text, name) == 0)
2163 return var_end(sp->text);
2165 return lookupvar(name);
2169 * Same as setvar except that the variable and value are passed in
2170 * the first argument as name=value. Since the first argument will
2171 * be actually stored in the table, it should not be a string that
2173 * Called with interrupts off.
2176 setvareq(char *s, int flags)
2178 struct var *vp, **vpp;
2181 flags |= (VEXPORT & (((unsigned) (1 - aflag)) - 1));
2182 vp = *findvar(vpp, s);
2184 if ((vp->flags & (VREADONLY|VDYNAMIC)) == VREADONLY) {
2187 if (flags & VNOSAVE)
2190 ash_msg_and_raise_error("%.*s: is read only", strchrnul(n, '=') - n, n);
2196 if (vp->var_func && !(flags & VNOFUNC))
2197 vp->var_func(var_end(s));
2199 if (!(vp->flags & (VTEXTFIXED|VSTACK)))
2200 free((char*)vp->var_text);
2202 flags |= vp->flags & ~(VTEXTFIXED|VSTACK|VNOSAVE|VUNSET);
2204 /* variable s is not found */
2207 vp = ckzalloc(sizeof(*vp));
2209 /*vp->func = NULL; - ckzalloc did it */
2212 if (!(flags & (VTEXTFIXED|VSTACK|VNOSAVE)))
2219 * Set the value of a variable. The flags argument is ored with the
2220 * flags of the variable. If val is NULL, the variable is unset.
2223 setvar(const char *name, const char *val, int flags)
2231 q = endofname(name);
2232 p = strchrnul(q, '=');
2234 if (!namelen || p != q)
2235 ash_msg_and_raise_error("%.*s: bad variable name", namelen, name);
2240 vallen = strlen(val);
2244 nameeq = ckmalloc(namelen + vallen + 2);
2245 p = memcpy(nameeq, name, namelen) + namelen;
2248 p = memcpy(p, val, vallen) + vallen;
2251 setvareq(nameeq, flags | VNOSAVE);
2255 static void FAST_FUNC
2256 setvar0(const char *name, const char *val)
2258 setvar(name, val, 0);
2261 #if ENABLE_ASH_GETOPTS
2263 * Safe version of setvar, returns 1 on success 0 on failure.
2266 setvarsafe(const char *name, const char *val, int flags)
2269 volatile int saveint;
2270 struct jmploc *volatile savehandler = exception_handler;
2271 struct jmploc jmploc;
2274 if (setjmp(jmploc.loc))
2277 exception_handler = &jmploc;
2278 setvar(name, val, flags);
2281 exception_handler = savehandler;
2282 RESTORE_INT(saveint);
2288 * Unset the specified variable.
2291 unsetvar(const char *s)
2297 vpp = findvar(hashvar(s), s);
2301 int flags = vp->flags;
2304 if (flags & VREADONLY)
2306 #if ENABLE_ASH_RANDOM_SUPPORT
2307 vp->flags &= ~VDYNAMIC;
2311 if ((flags & VSTRFIXED) == 0) {
2313 if ((flags & (VTEXTFIXED|VSTACK)) == 0)
2314 free((char*)vp->var_text);
2320 vp->flags &= ~VEXPORT;
2330 * Process a linked list of variable assignments.
2333 listsetvar(struct strlist *list_set_var, int flags)
2335 struct strlist *lp = list_set_var;
2341 setvareq(lp->text, flags);
2348 * Generate a list of variables satisfying the given conditions.
2351 listvars(int on, int off, char ***end)
2362 for (vp = *vpp; vp; vp = vp->next) {
2363 if ((vp->flags & mask) == on) {
2364 if (ep == stackstrend())
2365 ep = growstackstr();
2366 *ep++ = (char*)vp->var_text;
2369 } while (++vpp < vartab + VTABSIZE);
2370 if (ep == stackstrend())
2371 ep = growstackstr();
2375 return grabstackstr(ep);
2379 /* ============ Path search helper
2381 * The variable path (passed by reference) should be set to the start
2382 * of the path before the first call; path_advance will update
2383 * this value as it proceeds. Successive calls to path_advance will return
2384 * the possible path expansions in sequence. If an option (indicated by
2385 * a percent sign) appears in the path entry then the global variable
2386 * pathopt will be set to point to it; otherwise pathopt will be set to
2389 static const char *pathopt; /* set by path_advance */
2392 path_advance(const char **path, const char *name)
2402 for (p = start; *p && *p != ':' && *p != '%'; p++)
2404 len = p - start + strlen(name) + 2; /* "2" is for '/' and '\0' */
2405 while (stackblocksize() < len)
2409 memcpy(q, start, p - start);
2417 while (*p && *p != ':')
2424 return stalloc(len);
2428 /* ============ Prompt */
2430 static smallint doprompt; /* if set, prompt the user */
2431 static smallint needprompt; /* true if interactive and at start of line */
2433 #if ENABLE_FEATURE_EDITING
2434 static line_input_t *line_input_state;
2435 static const char *cmdedit_prompt;
2437 putprompt(const char *s)
2439 if (ENABLE_ASH_EXPAND_PRMT) {
2440 free((char*)cmdedit_prompt);
2441 cmdedit_prompt = ckstrdup(s);
2448 putprompt(const char *s)
2454 #if ENABLE_ASH_EXPAND_PRMT
2455 /* expandstr() needs parsing machinery, so it is far away ahead... */
2456 static const char *expandstr(const char *ps);
2458 #define expandstr(s) s
2462 setprompt_if(smallint do_set, int whichprompt)
2465 IF_ASH_EXPAND_PRMT(struct stackmark smark;)
2472 switch (whichprompt) {
2482 #if ENABLE_ASH_EXPAND_PRMT
2483 pushstackmark(&smark, stackblocksize());
2485 putprompt(expandstr(prompt));
2486 #if ENABLE_ASH_EXPAND_PRMT
2487 popstackmark(&smark);
2492 /* ============ The cd and pwd commands */
2494 #define CD_PHYSICAL 1
2504 while ((i = nextopt("LP")) != '\0') {
2506 flags ^= CD_PHYSICAL;
2515 * Update curdir (the name of the current directory) in response to a
2519 updatepwd(const char *dir)
2526 cdcomppath = sstrdup(dir);
2529 if (curdir == nullstr)
2531 new = stack_putstr(curdir, new);
2533 new = makestrspace(strlen(dir) + 2, new);
2534 lim = (char *)stackblock() + 1;
2538 if (new > lim && *lim == '/')
2543 if (dir[1] == '/' && dir[2] != '/') {
2549 p = strtok(cdcomppath, "/");
2553 if (p[1] == '.' && p[2] == '\0') {
2565 new = stack_putstr(p, new);
2568 p = strtok(NULL, "/");
2573 return stackblock();
2577 * Find out what the current directory is. If we already know the current
2578 * directory, this routine returns immediately.
2583 char *dir = getcwd(NULL, 0); /* huh, using glibc extension? */
2584 return dir ? dir : nullstr;
2588 setpwd(const char *val, int setold)
2592 oldcur = dir = curdir;
2595 setvar("OLDPWD", oldcur, VEXPORT);
2598 if (physdir != nullstr) {
2599 if (physdir != oldcur)
2603 if (oldcur == val || !val) {
2609 dir = ckstrdup(val);
2610 if (oldcur != dir && oldcur != nullstr) {
2615 setvar("PWD", dir, VEXPORT);
2618 static void hashcd(void);
2621 * Actually do the chdir. We also call hashcd to let the routines in exec.c
2622 * know that the current directory has changed.
2625 docd(const char *dest, int flags)
2627 const char *dir = NULL;
2630 TRACE(("docd(\"%s\", %d) called\n", dest, flags));
2633 if (!(flags & CD_PHYSICAL)) {
2634 dir = updatepwd(dest);
2648 static int FAST_FUNC
2649 cdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
2661 dest = bltinlookup("HOME");
2662 else if (LONE_DASH(dest)) {
2663 dest = bltinlookup("OLDPWD");
2685 path = bltinlookup("CDPATH");
2694 p = path_advance(&path, dest);
2695 if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
2699 if (!docd(p, flags))
2704 ash_msg_and_raise_error("can't cd to %s", dest);
2707 if (flags & CD_PRINT)
2708 out1fmt("%s\n", curdir);
2712 static int FAST_FUNC
2713 pwdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
2716 const char *dir = curdir;
2720 if (physdir == nullstr)
2724 out1fmt("%s\n", dir);
2729 /* ============ ... */
2732 #define IBUFSIZ (ENABLE_FEATURE_EDITING ? CONFIG_FEATURE_EDITING_MAX_LEN : 1024)
2734 /* Syntax classes */
2735 #define CWORD 0 /* character is nothing special */
2736 #define CNL 1 /* newline character */
2737 #define CBACK 2 /* a backslash character */
2738 #define CSQUOTE 3 /* single quote */
2739 #define CDQUOTE 4 /* double quote */
2740 #define CENDQUOTE 5 /* a terminating quote */
2741 #define CBQUOTE 6 /* backwards single quote */
2742 #define CVAR 7 /* a dollar sign */
2743 #define CENDVAR 8 /* a '}' character */
2744 #define CLP 9 /* a left paren in arithmetic */
2745 #define CRP 10 /* a right paren in arithmetic */
2746 #define CENDFILE 11 /* end of file */
2747 #define CCTL 12 /* like CWORD, except it must be escaped */
2748 #define CSPCL 13 /* these terminate a word */
2749 #define CIGN 14 /* character should be ignored */
2752 #if ENABLE_ASH_ALIAS
2756 #define USE_SIT_FUNCTION ENABLE_ASH_OPTIMIZE_FOR_SIZE
2758 #if ENABLE_SH_MATH_SUPPORT
2759 # define SIT_ITEM(a,b,c,d) (a | (b << 4) | (c << 8) | (d << 12))
2761 # define SIT_ITEM(a,b,c,d) (a | (b << 4) | (c << 8))
2763 static const uint16_t S_I_T[] ALIGN2 = {
2764 #if ENABLE_ASH_ALIAS
2765 SIT_ITEM(CSPCL , CIGN , CIGN , CIGN ), /* 0, PEOA */
2767 SIT_ITEM(CSPCL , CWORD , CWORD, CWORD ), /* 1, ' ' */
2768 SIT_ITEM(CNL , CNL , CNL , CNL ), /* 2, \n */
2769 SIT_ITEM(CWORD , CCTL , CCTL , CWORD ), /* 3, !*-/:=?[]~ */
2770 SIT_ITEM(CDQUOTE , CENDQUOTE, CWORD, CWORD ), /* 4, '"' */
2771 SIT_ITEM(CVAR , CVAR , CWORD, CVAR ), /* 5, $ */
2772 SIT_ITEM(CSQUOTE , CWORD , CENDQUOTE, CWORD), /* 6, "'" */
2773 SIT_ITEM(CSPCL , CWORD , CWORD, CLP ), /* 7, ( */
2774 SIT_ITEM(CSPCL , CWORD , CWORD, CRP ), /* 8, ) */
2775 SIT_ITEM(CBACK , CBACK , CCTL , CBACK ), /* 9, \ */
2776 SIT_ITEM(CBQUOTE , CBQUOTE , CWORD, CBQUOTE), /* 10, ` */
2777 SIT_ITEM(CENDVAR , CENDVAR , CWORD, CENDVAR), /* 11, } */
2778 #if !USE_SIT_FUNCTION
2779 SIT_ITEM(CENDFILE, CENDFILE , CENDFILE, CENDFILE),/* 12, PEOF */
2780 SIT_ITEM(CWORD , CWORD , CWORD, CWORD ), /* 13, 0-9A-Za-z */
2781 SIT_ITEM(CCTL , CCTL , CCTL , CCTL ) /* 14, CTLESC ... */
2785 /* Constants below must match table above */
2787 #if ENABLE_ASH_ALIAS
2788 CSPCL_CIGN_CIGN_CIGN , /* 0 */
2790 CSPCL_CWORD_CWORD_CWORD , /* 1 */
2791 CNL_CNL_CNL_CNL , /* 2 */
2792 CWORD_CCTL_CCTL_CWORD , /* 3 */
2793 CDQUOTE_CENDQUOTE_CWORD_CWORD , /* 4 */
2794 CVAR_CVAR_CWORD_CVAR , /* 5 */
2795 CSQUOTE_CWORD_CENDQUOTE_CWORD , /* 6 */
2796 CSPCL_CWORD_CWORD_CLP , /* 7 */
2797 CSPCL_CWORD_CWORD_CRP , /* 8 */
2798 CBACK_CBACK_CCTL_CBACK , /* 9 */
2799 CBQUOTE_CBQUOTE_CWORD_CBQUOTE , /* 10 */
2800 CENDVAR_CENDVAR_CWORD_CENDVAR , /* 11 */
2801 CENDFILE_CENDFILE_CENDFILE_CENDFILE, /* 12 */
2802 CWORD_CWORD_CWORD_CWORD , /* 13 */
2803 CCTL_CCTL_CCTL_CCTL , /* 14 */
2806 /* c in SIT(c, syntax) must be an *unsigned char* or PEOA or PEOF,
2807 * caller must ensure proper cast on it if c is *char_ptr!
2809 /* Values for syntax param */
2810 #define BASESYNTAX 0 /* not in quotes */
2811 #define DQSYNTAX 1 /* in double quotes */
2812 #define SQSYNTAX 2 /* in single quotes */
2813 #define ARISYNTAX 3 /* in arithmetic */
2814 #define PSSYNTAX 4 /* prompt. never passed to SIT() */
2816 #if USE_SIT_FUNCTION
2819 SIT(int c, int syntax)
2821 /* Used to also have '/' in this string: "\t\n !\"$&'()*-/:;<=>?[\\]`|}~" */
2822 static const char spec_symbls[] ALIGN1 = "\t\n !\"$&'()*-:;<=>?[\\]`|}~";
2824 * This causes '/' to be prepended with CTLESC in dquoted string,
2825 * making "./file"* treated incorrectly because we feed
2826 * ".\/file*" string to glob(), confusing it (see expandmeta func).
2827 * The "homegrown" glob implementation is okay with that,
2828 * but glibc one isn't. With '/' always treated as CWORD,
2831 # if ENABLE_ASH_ALIAS
2832 static const uint8_t syntax_index_table[] ALIGN1 = {
2833 1, 2, 1, 3, 4, 5, 1, 6, /* "\t\n !\"$&'" */
2834 7, 8, 3, 3,/*3,*/3, 1, 1, /* "()*-/:;<" */
2835 3, 1, 3, 3, 9, 3, 10, 1, /* "=>?[\\]`|" */
2839 static const uint8_t syntax_index_table[] ALIGN1 = {
2840 0, 1, 0, 2, 3, 4, 0, 5, /* "\t\n !\"$&'" */
2841 6, 7, 2, 2,/*2,*/2, 0, 0, /* "()*-/:;<" */
2842 2, 0, 2, 2, 8, 2, 9, 0, /* "=>?[\\]`|" */
2851 # if ENABLE_ASH_ALIAS
2857 /* Cast is purely for paranoia here,
2858 * just in case someone passed signed char to us */
2859 if ((unsigned char)c >= CTL_FIRST
2860 && (unsigned char)c <= CTL_LAST
2864 s = strchrnul(spec_symbls, c);
2867 indx = syntax_index_table[s - spec_symbls];
2869 return (S_I_T[indx] >> (syntax*4)) & 0xf;
2872 #else /* !USE_SIT_FUNCTION */
2874 static const uint8_t syntax_index_table[] ALIGN1 = {
2875 /* BASESYNTAX_DQSYNTAX_SQSYNTAX_ARISYNTAX */
2876 /* 0 */ CWORD_CWORD_CWORD_CWORD,
2877 /* 1 */ CWORD_CWORD_CWORD_CWORD,
2878 /* 2 */ CWORD_CWORD_CWORD_CWORD,
2879 /* 3 */ CWORD_CWORD_CWORD_CWORD,
2880 /* 4 */ CWORD_CWORD_CWORD_CWORD,
2881 /* 5 */ CWORD_CWORD_CWORD_CWORD,
2882 /* 6 */ CWORD_CWORD_CWORD_CWORD,
2883 /* 7 */ CWORD_CWORD_CWORD_CWORD,
2884 /* 8 */ CWORD_CWORD_CWORD_CWORD,
2885 /* 9 "\t" */ CSPCL_CWORD_CWORD_CWORD,
2886 /* 10 "\n" */ CNL_CNL_CNL_CNL,
2887 /* 11 */ CWORD_CWORD_CWORD_CWORD,
2888 /* 12 */ CWORD_CWORD_CWORD_CWORD,
2889 /* 13 */ CWORD_CWORD_CWORD_CWORD,
2890 /* 14 */ CWORD_CWORD_CWORD_CWORD,
2891 /* 15 */ CWORD_CWORD_CWORD_CWORD,
2892 /* 16 */ CWORD_CWORD_CWORD_CWORD,
2893 /* 17 */ CWORD_CWORD_CWORD_CWORD,
2894 /* 18 */ CWORD_CWORD_CWORD_CWORD,
2895 /* 19 */ CWORD_CWORD_CWORD_CWORD,
2896 /* 20 */ CWORD_CWORD_CWORD_CWORD,
2897 /* 21 */ CWORD_CWORD_CWORD_CWORD,
2898 /* 22 */ CWORD_CWORD_CWORD_CWORD,
2899 /* 23 */ CWORD_CWORD_CWORD_CWORD,
2900 /* 24 */ CWORD_CWORD_CWORD_CWORD,
2901 /* 25 */ CWORD_CWORD_CWORD_CWORD,
2902 /* 26 */ CWORD_CWORD_CWORD_CWORD,
2903 /* 27 */ CWORD_CWORD_CWORD_CWORD,
2904 /* 28 */ CWORD_CWORD_CWORD_CWORD,
2905 /* 29 */ CWORD_CWORD_CWORD_CWORD,
2906 /* 30 */ CWORD_CWORD_CWORD_CWORD,
2907 /* 31 */ CWORD_CWORD_CWORD_CWORD,
2908 /* 32 " " */ CSPCL_CWORD_CWORD_CWORD,
2909 /* 33 "!" */ CWORD_CCTL_CCTL_CWORD,
2910 /* 34 """ */ CDQUOTE_CENDQUOTE_CWORD_CWORD,
2911 /* 35 "#" */ CWORD_CWORD_CWORD_CWORD,
2912 /* 36 "$" */ CVAR_CVAR_CWORD_CVAR,
2913 /* 37 "%" */ CWORD_CWORD_CWORD_CWORD,
2914 /* 38 "&" */ CSPCL_CWORD_CWORD_CWORD,
2915 /* 39 "'" */ CSQUOTE_CWORD_CENDQUOTE_CWORD,
2916 /* 40 "(" */ CSPCL_CWORD_CWORD_CLP,
2917 /* 41 ")" */ CSPCL_CWORD_CWORD_CRP,
2918 /* 42 "*" */ CWORD_CCTL_CCTL_CWORD,
2919 /* 43 "+" */ CWORD_CWORD_CWORD_CWORD,
2920 /* 44 "," */ CWORD_CWORD_CWORD_CWORD,
2921 /* 45 "-" */ CWORD_CCTL_CCTL_CWORD,
2922 /* 46 "." */ CWORD_CWORD_CWORD_CWORD,
2923 /* "/" was CWORD_CCTL_CCTL_CWORD, see comment in SIT() function why this is changed: */
2924 /* 47 "/" */ CWORD_CWORD_CWORD_CWORD,
2925 /* 48 "0" */ CWORD_CWORD_CWORD_CWORD,
2926 /* 49 "1" */ CWORD_CWORD_CWORD_CWORD,
2927 /* 50 "2" */ CWORD_CWORD_CWORD_CWORD,
2928 /* 51 "3" */ CWORD_CWORD_CWORD_CWORD,
2929 /* 52 "4" */ CWORD_CWORD_CWORD_CWORD,
2930 /* 53 "5" */ CWORD_CWORD_CWORD_CWORD,
2931 /* 54 "6" */ CWORD_CWORD_CWORD_CWORD,
2932 /* 55 "7" */ CWORD_CWORD_CWORD_CWORD,
2933 /* 56 "8" */ CWORD_CWORD_CWORD_CWORD,
2934 /* 57 "9" */ CWORD_CWORD_CWORD_CWORD,
2935 /* 58 ":" */ CWORD_CCTL_CCTL_CWORD,
2936 /* 59 ";" */ CSPCL_CWORD_CWORD_CWORD,
2937 /* 60 "<" */ CSPCL_CWORD_CWORD_CWORD,
2938 /* 61 "=" */ CWORD_CCTL_CCTL_CWORD,
2939 /* 62 ">" */ CSPCL_CWORD_CWORD_CWORD,
2940 /* 63 "?" */ CWORD_CCTL_CCTL_CWORD,
2941 /* 64 "@" */ CWORD_CWORD_CWORD_CWORD,
2942 /* 65 "A" */ CWORD_CWORD_CWORD_CWORD,
2943 /* 66 "B" */ CWORD_CWORD_CWORD_CWORD,
2944 /* 67 "C" */ CWORD_CWORD_CWORD_CWORD,
2945 /* 68 "D" */ CWORD_CWORD_CWORD_CWORD,
2946 /* 69 "E" */ CWORD_CWORD_CWORD_CWORD,
2947 /* 70 "F" */ CWORD_CWORD_CWORD_CWORD,
2948 /* 71 "G" */ CWORD_CWORD_CWORD_CWORD,
2949 /* 72 "H" */ CWORD_CWORD_CWORD_CWORD,
2950 /* 73 "I" */ CWORD_CWORD_CWORD_CWORD,
2951 /* 74 "J" */ CWORD_CWORD_CWORD_CWORD,
2952 /* 75 "K" */ CWORD_CWORD_CWORD_CWORD,
2953 /* 76 "L" */ CWORD_CWORD_CWORD_CWORD,
2954 /* 77 "M" */ CWORD_CWORD_CWORD_CWORD,
2955 /* 78 "N" */ CWORD_CWORD_CWORD_CWORD,
2956 /* 79 "O" */ CWORD_CWORD_CWORD_CWORD,
2957 /* 80 "P" */ CWORD_CWORD_CWORD_CWORD,
2958 /* 81 "Q" */ CWORD_CWORD_CWORD_CWORD,
2959 /* 82 "R" */ CWORD_CWORD_CWORD_CWORD,
2960 /* 83 "S" */ CWORD_CWORD_CWORD_CWORD,
2961 /* 84 "T" */ CWORD_CWORD_CWORD_CWORD,
2962 /* 85 "U" */ CWORD_CWORD_CWORD_CWORD,
2963 /* 86 "V" */ CWORD_CWORD_CWORD_CWORD,
2964 /* 87 "W" */ CWORD_CWORD_CWORD_CWORD,
2965 /* 88 "X" */ CWORD_CWORD_CWORD_CWORD,
2966 /* 89 "Y" */ CWORD_CWORD_CWORD_CWORD,
2967 /* 90 "Z" */ CWORD_CWORD_CWORD_CWORD,
2968 /* 91 "[" */ CWORD_CCTL_CCTL_CWORD,
2969 /* 92 "\" */ CBACK_CBACK_CCTL_CBACK,
2970 /* 93 "]" */ CWORD_CCTL_CCTL_CWORD,
2971 /* 94 "^" */ CWORD_CWORD_CWORD_CWORD,
2972 /* 95 "_" */ CWORD_CWORD_CWORD_CWORD,
2973 /* 96 "`" */ CBQUOTE_CBQUOTE_CWORD_CBQUOTE,
2974 /* 97 "a" */ CWORD_CWORD_CWORD_CWORD,
2975 /* 98 "b" */ CWORD_CWORD_CWORD_CWORD,
2976 /* 99 "c" */ CWORD_CWORD_CWORD_CWORD,
2977 /* 100 "d" */ CWORD_CWORD_CWORD_CWORD,
2978 /* 101 "e" */ CWORD_CWORD_CWORD_CWORD,
2979 /* 102 "f" */ CWORD_CWORD_CWORD_CWORD,
2980 /* 103 "g" */ CWORD_CWORD_CWORD_CWORD,
2981 /* 104 "h" */ CWORD_CWORD_CWORD_CWORD,
2982 /* 105 "i" */ CWORD_CWORD_CWORD_CWORD,
2983 /* 106 "j" */ CWORD_CWORD_CWORD_CWORD,
2984 /* 107 "k" */ CWORD_CWORD_CWORD_CWORD,
2985 /* 108 "l" */ CWORD_CWORD_CWORD_CWORD,
2986 /* 109 "m" */ CWORD_CWORD_CWORD_CWORD,
2987 /* 110 "n" */ CWORD_CWORD_CWORD_CWORD,
2988 /* 111 "o" */ CWORD_CWORD_CWORD_CWORD,
2989 /* 112 "p" */ CWORD_CWORD_CWORD_CWORD,
2990 /* 113 "q" */ CWORD_CWORD_CWORD_CWORD,
2991 /* 114 "r" */ CWORD_CWORD_CWORD_CWORD,
2992 /* 115 "s" */ CWORD_CWORD_CWORD_CWORD,
2993 /* 116 "t" */ CWORD_CWORD_CWORD_CWORD,
2994 /* 117 "u" */ CWORD_CWORD_CWORD_CWORD,
2995 /* 118 "v" */ CWORD_CWORD_CWORD_CWORD,
2996 /* 119 "w" */ CWORD_CWORD_CWORD_CWORD,
2997 /* 120 "x" */ CWORD_CWORD_CWORD_CWORD,
2998 /* 121 "y" */ CWORD_CWORD_CWORD_CWORD,
2999 /* 122 "z" */ CWORD_CWORD_CWORD_CWORD,
3000 /* 123 "{" */ CWORD_CWORD_CWORD_CWORD,
3001 /* 124 "|" */ CSPCL_CWORD_CWORD_CWORD,
3002 /* 125 "}" */ CENDVAR_CENDVAR_CWORD_CENDVAR,
3003 /* 126 "~" */ CWORD_CCTL_CCTL_CWORD,
3004 /* 127 del */ CWORD_CWORD_CWORD_CWORD,
3005 /* 128 0x80 */ CWORD_CWORD_CWORD_CWORD,
3006 /* 129 CTLESC */ CCTL_CCTL_CCTL_CCTL,
3007 /* 130 CTLVAR */ CCTL_CCTL_CCTL_CCTL,
3008 /* 131 CTLENDVAR */ CCTL_CCTL_CCTL_CCTL,
3009 /* 132 CTLBACKQ */ CCTL_CCTL_CCTL_CCTL,
3010 /* 133 CTLQUOTE */ CCTL_CCTL_CCTL_CCTL,
3011 /* 134 CTLARI */ CCTL_CCTL_CCTL_CCTL,
3012 /* 135 CTLENDARI */ CCTL_CCTL_CCTL_CCTL,
3013 /* 136 CTLQUOTEMARK */ CCTL_CCTL_CCTL_CCTL,
3014 /* 137 */ CWORD_CWORD_CWORD_CWORD,
3015 /* 138 */ CWORD_CWORD_CWORD_CWORD,
3016 /* 139 */ CWORD_CWORD_CWORD_CWORD,
3017 /* 140 */ CWORD_CWORD_CWORD_CWORD,
3018 /* 141 */ CWORD_CWORD_CWORD_CWORD,
3019 /* 142 */ CWORD_CWORD_CWORD_CWORD,
3020 /* 143 */ CWORD_CWORD_CWORD_CWORD,
3021 /* 144 */ CWORD_CWORD_CWORD_CWORD,
3022 /* 145 */ CWORD_CWORD_CWORD_CWORD,
3023 /* 146 */ CWORD_CWORD_CWORD_CWORD,
3024 /* 147 */ CWORD_CWORD_CWORD_CWORD,
3025 /* 148 */ CWORD_CWORD_CWORD_CWORD,
3026 /* 149 */ CWORD_CWORD_CWORD_CWORD,
3027 /* 150 */ CWORD_CWORD_CWORD_CWORD,
3028 /* 151 */ CWORD_CWORD_CWORD_CWORD,
3029 /* 152 */ CWORD_CWORD_CWORD_CWORD,
3030 /* 153 */ CWORD_CWORD_CWORD_CWORD,
3031 /* 154 */ CWORD_CWORD_CWORD_CWORD,
3032 /* 155 */ CWORD_CWORD_CWORD_CWORD,
3033 /* 156 */ CWORD_CWORD_CWORD_CWORD,
3034 /* 157 */ CWORD_CWORD_CWORD_CWORD,
3035 /* 158 */ CWORD_CWORD_CWORD_CWORD,
3036 /* 159 */ CWORD_CWORD_CWORD_CWORD,
3037 /* 160 */ CWORD_CWORD_CWORD_CWORD,
3038 /* 161 */ CWORD_CWORD_CWORD_CWORD,
3039 /* 162 */ CWORD_CWORD_CWORD_CWORD,
3040 /* 163 */ CWORD_CWORD_CWORD_CWORD,
3041 /* 164 */ CWORD_CWORD_CWORD_CWORD,
3042 /* 165 */ CWORD_CWORD_CWORD_CWORD,
3043 /* 166 */ CWORD_CWORD_CWORD_CWORD,
3044 /* 167 */ CWORD_CWORD_CWORD_CWORD,
3045 /* 168 */ CWORD_CWORD_CWORD_CWORD,
3046 /* 169 */ CWORD_CWORD_CWORD_CWORD,
3047 /* 170 */ CWORD_CWORD_CWORD_CWORD,
3048 /* 171 */ CWORD_CWORD_CWORD_CWORD,
3049 /* 172 */ CWORD_CWORD_CWORD_CWORD,
3050 /* 173 */ CWORD_CWORD_CWORD_CWORD,
3051 /* 174 */ CWORD_CWORD_CWORD_CWORD,
3052 /* 175 */ CWORD_CWORD_CWORD_CWORD,
3053 /* 176 */ CWORD_CWORD_CWORD_CWORD,
3054 /* 177 */ CWORD_CWORD_CWORD_CWORD,
3055 /* 178 */ CWORD_CWORD_CWORD_CWORD,
3056 /* 179 */ CWORD_CWORD_CWORD_CWORD,
3057 /* 180 */ CWORD_CWORD_CWORD_CWORD,
3058 /* 181 */ CWORD_CWORD_CWORD_CWORD,
3059 /* 182 */ CWORD_CWORD_CWORD_CWORD,
3060 /* 183 */ CWORD_CWORD_CWORD_CWORD,
3061 /* 184 */ CWORD_CWORD_CWORD_CWORD,
3062 /* 185 */ CWORD_CWORD_CWORD_CWORD,
3063 /* 186 */ CWORD_CWORD_CWORD_CWORD,
3064 /* 187 */ CWORD_CWORD_CWORD_CWORD,
3065 /* 188 */ CWORD_CWORD_CWORD_CWORD,
3066 /* 189 */ CWORD_CWORD_CWORD_CWORD,
3067 /* 190 */ CWORD_CWORD_CWORD_CWORD,
3068 /* 191 */ CWORD_CWORD_CWORD_CWORD,
3069 /* 192 */ CWORD_CWORD_CWORD_CWORD,
3070 /* 193 */ CWORD_CWORD_CWORD_CWORD,
3071 /* 194 */ CWORD_CWORD_CWORD_CWORD,
3072 /* 195 */ CWORD_CWORD_CWORD_CWORD,
3073 /* 196 */ CWORD_CWORD_CWORD_CWORD,
3074 /* 197 */ CWORD_CWORD_CWORD_CWORD,
3075 /* 198 */ CWORD_CWORD_CWORD_CWORD,
3076 /* 199 */ CWORD_CWORD_CWORD_CWORD,
3077 /* 200 */ CWORD_CWORD_CWORD_CWORD,
3078 /* 201 */ CWORD_CWORD_CWORD_CWORD,
3079 /* 202 */ CWORD_CWORD_CWORD_CWORD,
3080 /* 203 */ CWORD_CWORD_CWORD_CWORD,
3081 /* 204 */ CWORD_CWORD_CWORD_CWORD,
3082 /* 205 */ CWORD_CWORD_CWORD_CWORD,
3083 /* 206 */ CWORD_CWORD_CWORD_CWORD,
3084 /* 207 */ CWORD_CWORD_CWORD_CWORD,
3085 /* 208 */ CWORD_CWORD_CWORD_CWORD,
3086 /* 209 */ CWORD_CWORD_CWORD_CWORD,
3087 /* 210 */ CWORD_CWORD_CWORD_CWORD,
3088 /* 211 */ CWORD_CWORD_CWORD_CWORD,
3089 /* 212 */ CWORD_CWORD_CWORD_CWORD,
3090 /* 213 */ CWORD_CWORD_CWORD_CWORD,
3091 /* 214 */ CWORD_CWORD_CWORD_CWORD,
3092 /* 215 */ CWORD_CWORD_CWORD_CWORD,
3093 /* 216 */ CWORD_CWORD_CWORD_CWORD,
3094 /* 217 */ CWORD_CWORD_CWORD_CWORD,
3095 /* 218 */ CWORD_CWORD_CWORD_CWORD,
3096 /* 219 */ CWORD_CWORD_CWORD_CWORD,
3097 /* 220 */ CWORD_CWORD_CWORD_CWORD,
3098 /* 221 */ CWORD_CWORD_CWORD_CWORD,
3099 /* 222 */ CWORD_CWORD_CWORD_CWORD,
3100 /* 223 */ CWORD_CWORD_CWORD_CWORD,
3101 /* 224 */ CWORD_CWORD_CWORD_CWORD,
3102 /* 225 */ CWORD_CWORD_CWORD_CWORD,
3103 /* 226 */ CWORD_CWORD_CWORD_CWORD,
3104 /* 227 */ CWORD_CWORD_CWORD_CWORD,
3105 /* 228 */ CWORD_CWORD_CWORD_CWORD,
3106 /* 229 */ CWORD_CWORD_CWORD_CWORD,
3107 /* 230 */ CWORD_CWORD_CWORD_CWORD,
3108 /* 231 */ CWORD_CWORD_CWORD_CWORD,
3109 /* 232 */ CWORD_CWORD_CWORD_CWORD,
3110 /* 233 */ CWORD_CWORD_CWORD_CWORD,
3111 /* 234 */ CWORD_CWORD_CWORD_CWORD,
3112 /* 235 */ CWORD_CWORD_CWORD_CWORD,
3113 /* 236 */ CWORD_CWORD_CWORD_CWORD,
3114 /* 237 */ CWORD_CWORD_CWORD_CWORD,
3115 /* 238 */ CWORD_CWORD_CWORD_CWORD,
3116 /* 239 */ CWORD_CWORD_CWORD_CWORD,
3117 /* 230 */ CWORD_CWORD_CWORD_CWORD,
3118 /* 241 */ CWORD_CWORD_CWORD_CWORD,
3119 /* 242 */ CWORD_CWORD_CWORD_CWORD,
3120 /* 243 */ CWORD_CWORD_CWORD_CWORD,
3121 /* 244 */ CWORD_CWORD_CWORD_CWORD,
3122 /* 245 */ CWORD_CWORD_CWORD_CWORD,
3123 /* 246 */ CWORD_CWORD_CWORD_CWORD,
3124 /* 247 */ CWORD_CWORD_CWORD_CWORD,
3125 /* 248 */ CWORD_CWORD_CWORD_CWORD,
3126 /* 249 */ CWORD_CWORD_CWORD_CWORD,
3127 /* 250 */ CWORD_CWORD_CWORD_CWORD,
3128 /* 251 */ CWORD_CWORD_CWORD_CWORD,
3129 /* 252 */ CWORD_CWORD_CWORD_CWORD,
3130 /* 253 */ CWORD_CWORD_CWORD_CWORD,
3131 /* 254 */ CWORD_CWORD_CWORD_CWORD,
3132 /* 255 */ CWORD_CWORD_CWORD_CWORD,
3133 /* PEOF */ CENDFILE_CENDFILE_CENDFILE_CENDFILE,
3134 # if ENABLE_ASH_ALIAS
3135 /* PEOA */ CSPCL_CIGN_CIGN_CIGN,
3139 # define SIT(c, syntax) ((S_I_T[syntax_index_table[c]] >> ((syntax)*4)) & 0xf)
3141 #endif /* !USE_SIT_FUNCTION */
3144 /* ============ Alias handling */
3146 #if ENABLE_ASH_ALIAS
3148 #define ALIASINUSE 1
3159 static struct alias **atab; // [ATABSIZE];
3160 #define INIT_G_alias() do { \
3161 atab = xzalloc(ATABSIZE * sizeof(atab[0])); \
3165 static struct alias **
3166 __lookupalias(const char *name)
3168 unsigned int hashval;
3175 ch = (unsigned char)*p;
3179 ch = (unsigned char)*++p;
3181 app = &atab[hashval % ATABSIZE];
3183 for (; *app; app = &(*app)->next) {
3184 if (strcmp(name, (*app)->name) == 0) {
3192 static struct alias *
3193 lookupalias(const char *name, int check)
3195 struct alias *ap = *__lookupalias(name);
3197 if (check && ap && (ap->flag & ALIASINUSE))
3202 static struct alias *
3203 freealias(struct alias *ap)
3207 if (ap->flag & ALIASINUSE) {
3208 ap->flag |= ALIASDEAD;
3220 setalias(const char *name, const char *val)
3222 struct alias *ap, **app;
3224 app = __lookupalias(name);
3228 if (!(ap->flag & ALIASINUSE)) {
3231 ap->val = ckstrdup(val);
3232 ap->flag &= ~ALIASDEAD;
3235 ap = ckzalloc(sizeof(struct alias));
3236 ap->name = ckstrdup(name);
3237 ap->val = ckstrdup(val);
3238 /*ap->flag = 0; - ckzalloc did it */
3239 /*ap->next = NULL;*/
3246 unalias(const char *name)
3250 app = __lookupalias(name);
3254 *app = freealias(*app);
3265 struct alias *ap, **app;
3269 for (i = 0; i < ATABSIZE; i++) {
3271 for (ap = *app; ap; ap = *app) {
3272 *app = freealias(*app);
3282 printalias(const struct alias *ap)
3284 out1fmt("%s=%s\n", ap->name, single_quote(ap->val));
3288 * TODO - sort output
3290 static int FAST_FUNC
3291 aliascmd(int argc UNUSED_PARAM, char **argv)
3300 for (i = 0; i < ATABSIZE; i++) {
3301 for (ap = atab[i]; ap; ap = ap->next) {
3307 while ((n = *++argv) != NULL) {
3308 v = strchr(n+1, '=');
3309 if (v == NULL) { /* n+1: funny ksh stuff */
3310 ap = *__lookupalias(n);
3312 fprintf(stderr, "%s: %s not found\n", "alias", n);
3325 static int FAST_FUNC
3326 unaliascmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
3330 while ((i = nextopt("a")) != '\0') {
3336 for (i = 0; *argptr; argptr++) {
3337 if (unalias(*argptr)) {
3338 fprintf(stderr, "%s: %s not found\n", "unalias", *argptr);
3346 #endif /* ASH_ALIAS */
3349 /* Mode argument to forkshell. Don't change FORK_FG or FORK_BG. */
3352 #define FORK_NOJOB 2
3354 /* mode flags for showjob(s) */
3355 #define SHOW_ONLY_PGID 0x01 /* show only pgid (jobs -p) */
3356 #define SHOW_PIDS 0x02 /* show individual pids, not just one line per job */
3357 #define SHOW_CHANGED 0x04 /* only jobs whose state has changed */
3358 #define SHOW_STDERR 0x08 /* print to stderr (else stdout) */
3361 * A job structure contains information about a job. A job is either a
3362 * single process or a set of processes contained in a pipeline. In the
3363 * latter case, pidlist will be non-NULL, and will point to a -1 terminated
3367 pid_t ps_pid; /* process id */
3368 int ps_status; /* last process status from wait() */
3369 char *ps_cmd; /* text of command being run */
3373 struct procstat ps0; /* status of process */
3374 struct procstat *ps; /* status or processes when more than one */
3376 int stopstatus; /* status of a stopped job */
3379 nprocs: 16, /* number of processes */
3381 #define JOBRUNNING 0 /* at least one proc running */
3382 #define JOBSTOPPED 1 /* all procs are stopped */
3383 #define JOBDONE 2 /* all procs are completed */
3385 sigint: 1, /* job was killed by SIGINT */
3386 jobctl: 1, /* job running under job control */
3388 waited: 1, /* true if this entry has been waited for */
3389 used: 1, /* true if this entry is in used */
3390 changed: 1; /* true if status has changed */
3391 struct job *prev_job; /* previous job */
3394 static struct job *makejob(/*union node *,*/ int);
3395 static int forkshell(struct job *, union node *, int);
3396 static int waitforjob(struct job *);
3399 enum { doing_jobctl = 0 };
3400 #define setjobctl(on) do {} while (0)
3402 static smallint doing_jobctl; //references:8
3403 static void setjobctl(int);
3410 ignoresig(int signo)
3412 /* Avoid unnecessary system calls. Is it already SIG_IGNed? */
3413 if (sigmode[signo - 1] != S_IGN && sigmode[signo - 1] != S_HARD_IGN) {
3414 /* No, need to do it */
3415 signal(signo, SIG_IGN);
3417 sigmode[signo - 1] = S_HARD_IGN;
3421 * Only one usage site - in setsignal()
3424 signal_handler(int signo)
3426 gotsig[signo - 1] = 1;
3428 if (signo == SIGINT && !trap[SIGINT]) {
3429 if (!suppress_int) {
3431 raise_interrupt(); /* does not return */
3435 pending_sig = signo;
3440 * Set the signal handler for the specified signal. The routine figures
3441 * out what it should be set to.
3444 setsignal(int signo)
3447 char cur_act, new_act;
3448 struct sigaction act;
3452 if (t != NULL) { /* trap for this sig is set */
3454 if (t[0] == '\0') /* trap is "": ignore this sig */
3458 if (rootshell && new_act == S_DFL) {
3461 if (iflag || minusc || sflag == 0)
3470 * "In all cases, bash ignores SIGQUIT. Non-builtin
3471 * commands run by bash have signal handlers
3472 * set to the values inherited by the shell
3473 * from its parent". */
3489 //TODO: if !rootshell, we reset SIGQUIT to DFL,
3490 //whereas we have to restore it to what shell got on entry
3491 //from the parent. See comment above
3493 t = &sigmode[signo - 1];
3496 /* current setting is not yet known */
3497 if (sigaction(signo, NULL, &act)) {
3498 /* pretend it worked; maybe we should give a warning,
3499 * but other shells don't. We don't alter sigmode,
3500 * so we retry every time.
3501 * btw, in Linux it never fails. --vda */
3504 if (act.sa_handler == SIG_IGN) {
3505 cur_act = S_HARD_IGN;
3507 && (signo == SIGTSTP || signo == SIGTTIN || signo == SIGTTOU)
3509 cur_act = S_IGN; /* don't hard ignore these */
3513 if (cur_act == S_HARD_IGN || cur_act == new_act)
3516 act.sa_handler = SIG_DFL;
3519 act.sa_handler = signal_handler;
3522 act.sa_handler = SIG_IGN;
3526 /* flags and mask matter only if !DFL and !IGN, but we do it
3527 * for all cases for more deterministic behavior:
3530 sigfillset(&act.sa_mask);
3532 sigaction_set(signo, &act);
3537 /* mode flags for set_curjob */
3538 #define CUR_DELETE 2
3539 #define CUR_RUNNING 1
3540 #define CUR_STOPPED 0
3542 /* mode flags for dowait */
3543 #define DOWAIT_NONBLOCK WNOHANG
3544 #define DOWAIT_BLOCK 0
3547 /* pgrp of shell on invocation */
3548 static int initialpgrp; //references:2
3549 static int ttyfd = -1; //5
3552 static struct job *jobtab; //5
3554 static unsigned njobs; //4
3556 static struct job *curjob; //lots
3557 /* number of presumed living untracked jobs */
3558 static int jobless; //4
3561 set_curjob(struct job *jp, unsigned mode)
3564 struct job **jpp, **curp;
3566 /* first remove from list */
3567 jpp = curp = &curjob;
3572 jpp = &jp1->prev_job;
3574 *jpp = jp1->prev_job;
3576 /* Then re-insert in correct position */
3584 /* job being deleted */
3587 /* newly created job or backgrounded job,
3588 * put after all stopped jobs.
3593 if (!jp1 || jp1->state != JOBSTOPPED)
3596 jpp = &jp1->prev_job;
3602 /* newly stopped job - becomes curjob */
3603 jp->prev_job = *jpp;
3611 jobno(const struct job *jp)
3613 return jp - jobtab + 1;
3618 * Convert a job name to a job structure.
3621 #define getjob(name, getctl) getjob(name)
3624 getjob(const char *name, int getctl)
3628 const char *err_msg = "%s: no such job";
3632 char *(*match)(const char *, const char *);
3647 if (c == '+' || c == '%') {
3649 err_msg = "No current job";
3655 err_msg = "No previous job";
3665 if (num > 0 && num <= njobs) {
3666 jp = jobtab + num - 1;
3681 if (match(jp->ps[0].ps_cmd, p)) {
3685 err_msg = "%s: ambiguous";
3695 err_msg = "job %s not created under job control";
3696 if (getctl && jp->jobctl == 0)
3701 ash_msg_and_raise_error(err_msg, name);
3705 * Mark a job structure as unused.
3708 freejob(struct job *jp)
3710 struct procstat *ps;
3714 for (i = jp->nprocs, ps = jp->ps; --i >= 0; ps++) {
3715 if (ps->ps_cmd != nullstr)
3718 if (jp->ps != &jp->ps0)
3721 set_curjob(jp, CUR_DELETE);
3727 xtcsetpgrp(int fd, pid_t pgrp)
3729 if (tcsetpgrp(fd, pgrp))
3730 ash_msg_and_raise_error("can't set tty process group (%m)");
3734 * Turn job control on and off.
3736 * Note: This code assumes that the third arg to ioctl is a character
3737 * pointer, which is true on Berkeley systems but not System V. Since
3738 * System V doesn't have job control yet, this isn't a problem now.
3740 * Called with interrupts off.
3748 if (on == doing_jobctl || rootshell == 0)
3752 ofd = fd = open(_PATH_TTY, O_RDWR);
3754 /* BTW, bash will try to open(ttyname(0)) if open("/dev/tty") fails.
3755 * That sometimes helps to acquire controlling tty.
3756 * Obviously, a workaround for bugs when someone
3757 * failed to provide a controlling tty to bash! :) */
3763 /* fd is a tty at this point */
3764 fd = fcntl(fd, F_DUPFD, 10);
3765 if (ofd >= 0) /* if it is "/dev/tty", close. If 0/1/2, dont */
3768 goto out; /* F_DUPFD failed */
3769 close_on_exec_on(fd);
3770 while (1) { /* while we are in the background */
3771 pgrp = tcgetpgrp(fd);
3774 ash_msg("can't access tty; job control turned off");
3778 if (pgrp == getpgrp())
3789 xtcsetpgrp(fd, pgrp);
3791 /* turning job control off */
3794 /* was xtcsetpgrp, but this can make exiting ash
3795 * loop forever if pty is already deleted */
3796 tcsetpgrp(fd, pgrp);
3810 static int FAST_FUNC
3811 killcmd(int argc, char **argv)
3813 if (argv[1] && strcmp(argv[1], "-l") != 0) {
3816 if (argv[i][0] == '%') {
3818 * "kill %N" - job kill
3819 * Converting to pgrp / pid kill
3825 jp = getjob(argv[i], 0);
3827 * In jobs started under job control, we signal
3828 * entire process group by kill -PGRP_ID.
3829 * This happens, f.e., in interactive shell.
3831 * Otherwise, we signal each child via
3832 * kill PID1 PID2 PID3.
3834 * sh -c 'sleep 1|sleep 1 & kill %1'
3835 * sh -c 'true|sleep 2 & sleep 1; kill %1'
3836 * sh -c 'true|sleep 1 & sleep 2; kill %1'
3838 n = jp->nprocs; /* can't be 0 (I hope) */
3841 dst = alloca(n * sizeof(int)*4);
3843 for (j = 0; j < n; j++) {
3844 struct procstat *ps = &jp->ps[j];
3845 /* Skip non-running and not-stopped members
3846 * (i.e. dead members) of the job
3848 if (ps->ps_status != -1 && !WIFSTOPPED(ps->ps_status))
3851 * kill_main has matching code to expect
3852 * leading space. Needed to not confuse
3853 * negative pids with "kill -SIGNAL_NO" syntax
3855 dst += sprintf(dst, jp->jobctl ? " -%u" : " %u", (int)ps->ps_pid);
3859 } while (argv[++i]);
3861 return kill_main(argc, argv);
3865 showpipe(struct job *jp /*, FILE *out*/)
3867 struct procstat *ps;
3868 struct procstat *psend;
3870 psend = jp->ps + jp->nprocs;
3871 for (ps = jp->ps + 1; ps < psend; ps++)
3872 printf(" | %s", ps->ps_cmd);
3873 newline_and_flush(stdout);
3874 flush_stdout_stderr();
3879 restartjob(struct job *jp, int mode)
3881 struct procstat *ps;
3887 if (jp->state == JOBDONE)
3889 jp->state = JOBRUNNING;
3890 pgid = jp->ps[0].ps_pid;
3891 if (mode == FORK_FG)
3892 xtcsetpgrp(ttyfd, pgid);
3893 killpg(pgid, SIGCONT);
3897 if (WIFSTOPPED(ps->ps_status)) {
3903 status = (mode == FORK_FG) ? waitforjob(jp) : 0;
3908 static int FAST_FUNC
3909 fg_bgcmd(int argc UNUSED_PARAM, char **argv)
3915 mode = (**argv == 'f') ? FORK_FG : FORK_BG;
3919 jp = getjob(*argv, 1);
3920 if (mode == FORK_BG) {
3921 set_curjob(jp, CUR_RUNNING);
3922 printf("[%d] ", jobno(jp));
3924 out1str(jp->ps[0].ps_cmd);
3925 showpipe(jp /*, stdout*/);
3926 retval = restartjob(jp, mode);
3927 } while (*argv && *++argv);
3933 sprint_status48(char *s, int status, int sigonly)
3939 if (!WIFEXITED(status)) {
3940 if (JOBS && WIFSTOPPED(status))
3941 st = WSTOPSIG(status);
3943 st = WTERMSIG(status);
3945 if (st == SIGINT || st == SIGPIPE)
3947 if (JOBS && WIFSTOPPED(status))
3951 //TODO: use bbox's get_signame? strsignal adds ~600 bytes to text+rodata
3952 col = fmtstr(s, 32, strsignal(st));
3953 if (WCOREDUMP(status)) {
3954 strcpy(s + col, " (core dumped)");
3955 col += sizeof(" (core dumped)")-1;
3957 } else if (!sigonly) {
3958 st = WEXITSTATUS(status);
3959 col = fmtstr(s, 16, (st ? "Done(%d)" : "Done"), st);
3966 dowait(int wait_flags, struct job *job)
3971 struct job *thisjob;
3973 TRACE(("dowait(0x%x) called\n", wait_flags));
3975 /* Do a wait system call. If job control is compiled in, we accept
3976 * stopped processes. wait_flags may have WNOHANG, preventing blocking.
3977 * NB: _not_ safe_waitpid, we need to detect EINTR */
3979 wait_flags |= WUNTRACED;
3980 pid = waitpid(-1, &status, wait_flags);
3981 TRACE(("wait returns pid=%d, status=0x%x, errno=%d(%s)\n",
3982 pid, status, errno, strerror(errno)));
3988 for (jp = curjob; jp; jp = jp->prev_job) {
3990 struct procstat *ps;
3991 struct procstat *psend;
3992 if (jp->state == JOBDONE)
3996 psend = ps + jp->nprocs;
3998 if (ps->ps_pid == pid) {
3999 TRACE(("Job %d: changing status of proc %d "
4000 "from 0x%x to 0x%x\n",
4001 jobno(jp), pid, ps->ps_status, status));
4002 ps->ps_status = status;
4005 if (ps->ps_status == -1)
4006 jobstate = JOBRUNNING;
4008 if (jobstate == JOBRUNNING)
4010 if (WIFSTOPPED(ps->ps_status)) {
4011 jp->stopstatus = ps->ps_status;
4012 jobstate = JOBSTOPPED;
4015 } while (++ps < psend);
4019 /* Found the job where one of its processes changed its state.
4020 * Is there at least one live and running process in this job? */
4021 if (jobstate != JOBRUNNING) {
4022 /* No. All live processes in the job are stopped
4023 * (JOBSTOPPED) or there are no live processes (JOBDONE)
4025 thisjob->changed = 1;
4026 if (thisjob->state != jobstate) {
4027 TRACE(("Job %d: changing state from %d to %d\n",
4028 jobno(thisjob), thisjob->state, jobstate));
4029 thisjob->state = jobstate;
4031 if (jobstate == JOBSTOPPED)
4032 set_curjob(thisjob, CUR_STOPPED);
4038 /* The process wasn't found in job list */
4039 if (JOBS && !WIFSTOPPED(status))
4044 if (thisjob && thisjob == job) {
4048 len = sprint_status48(s, status, 1);
4059 blocking_wait_with_raise_on_sig(void)
4061 pid_t pid = dowait(DOWAIT_BLOCK, NULL);
4062 if (pid <= 0 && pending_sig)
4063 raise_exception(EXSIG);
4069 showjob(struct job *jp, int mode)
4071 struct procstat *ps;
4072 struct procstat *psend;
4075 char s[16 + 16 + 48];
4076 FILE *out = (mode & SHOW_STDERR ? stderr : stdout);
4080 if (mode & SHOW_ONLY_PGID) { /* jobs -p */
4081 /* just output process (group) id of pipeline */
4082 fprintf(out, "%d\n", ps->ps_pid);
4086 col = fmtstr(s, 16, "[%d] ", jobno(jp));
4091 else if (curjob && jp == curjob->prev_job)
4094 if (mode & SHOW_PIDS)
4095 col += fmtstr(s + col, 16, "%d ", ps->ps_pid);
4097 psend = ps + jp->nprocs;
4099 if (jp->state == JOBRUNNING) {
4100 strcpy(s + col, "Running");
4101 col += sizeof("Running") - 1;
4103 int status = psend[-1].ps_status;
4104 if (jp->state == JOBSTOPPED)
4105 status = jp->stopstatus;
4106 col += sprint_status48(s + col, status, 0);
4108 /* By now, "[JOBID]* [maybe PID] STATUS" is printed */
4110 /* This loop either prints "<cmd1> | <cmd2> | <cmd3>" line
4111 * or prints several "PID | <cmdN>" lines,
4112 * depending on SHOW_PIDS bit.
4113 * We do not print status of individual processes
4114 * between PID and <cmdN>. bash does it, but not very well:
4115 * first line shows overall job status, not process status,
4116 * making it impossible to know 1st process status.
4120 /* for each process */
4123 if (mode & SHOW_PIDS)
4124 col = fmtstr(s, 48, "\n%*c%d ", indent_col, ' ', ps->ps_pid) - 1;
4126 fprintf(out, "%s%*c%s%s",
4128 33 - col >= 0 ? 33 - col : 0, ' ',
4129 ps == jp->ps ? "" : "| ",
4132 } while (++ps != psend);
4133 newline_and_flush(out);
4137 if (jp->state == JOBDONE) {
4138 TRACE(("showjob: freeing job %d\n", jobno(jp)));
4144 * Print a list of jobs. If "change" is nonzero, only print jobs whose
4145 * statuses have changed since the last call to showjobs.
4152 TRACE(("showjobs(0x%x) called\n", mode));
4154 /* Handle all finished jobs */
4155 while (dowait(DOWAIT_NONBLOCK, NULL) > 0)
4158 for (jp = curjob; jp; jp = jp->prev_job) {
4159 if (!(mode & SHOW_CHANGED) || jp->changed) {
4165 static int FAST_FUNC
4166 jobscmd(int argc UNUSED_PARAM, char **argv)
4171 while ((m = nextopt("lp")) != '\0') {
4175 mode |= SHOW_ONLY_PGID;
4181 showjob(getjob(*argv, 0), mode);
4191 /* Called only on finished or stopped jobs (no members are running) */
4193 getstatus(struct job *job)
4197 struct procstat *ps;
4199 /* Fetch last member's status */
4200 ps = job->ps + job->nprocs - 1;
4201 status = ps->ps_status;
4203 /* "set -o pipefail" mode: use last _nonzero_ status */
4204 while (status == 0 && --ps >= job->ps)
4205 status = ps->ps_status;
4208 retval = WEXITSTATUS(status);
4209 if (!WIFEXITED(status)) {
4211 retval = WSTOPSIG(status);
4212 if (!WIFSTOPPED(status))
4215 /* XXX: limits number of signals */
4216 retval = WTERMSIG(status);
4218 if (retval == SIGINT)
4224 TRACE(("getstatus: job %d, nproc %d, status 0x%x, retval 0x%x\n",
4225 jobno(job), job->nprocs, status, retval));
4229 static int FAST_FUNC
4230 waitcmd(int argc UNUSED_PARAM, char **argv)
4237 raise_exception(EXSIG);
4244 /* wait for all jobs */
4248 if (!jp) /* no running procs */
4250 if (jp->state == JOBRUNNING)
4255 blocking_wait_with_raise_on_sig();
4257 * "When bash is waiting for an asynchronous command via
4258 * the wait builtin, the reception of a signal for which a trap
4259 * has been set will cause the wait builtin to return immediately
4260 * with an exit status greater than 128, immediately after which
4261 * the trap is executed."
4263 * blocking_wait_with_raise_on_sig raises signal handlers
4264 * if it gets no pid (pid < 0). However,
4265 * if child sends us a signal *and immediately exits*,
4266 * blocking_wait_with_raise_on_sig gets pid > 0
4267 * and does not handle pending_sig. Check this case: */
4269 raise_exception(EXSIG);
4275 if (**argv != '%') {
4276 pid_t pid = number(*argv);
4281 if (job->ps[job->nprocs - 1].ps_pid == pid)
4283 job = job->prev_job;
4286 job = getjob(*argv, 0);
4288 /* loop until process terminated or stopped */
4289 while (job->state == JOBRUNNING)
4290 blocking_wait_with_raise_on_sig();
4292 retval = getstatus(job);
4305 struct job *jp, *jq;
4307 len = njobs * sizeof(*jp);
4309 jp = ckrealloc(jq, len + 4 * sizeof(*jp));
4311 offset = (char *)jp - (char *)jq;
4313 /* Relocate pointers */
4316 jq = (struct job *)((char *)jq + l);
4320 #define joff(p) ((struct job *)((char *)(p) + l))
4321 #define jmove(p) (p) = (void *)((char *)(p) + offset)
4322 if (joff(jp)->ps == &jq->ps0)
4323 jmove(joff(jp)->ps);
4324 if (joff(jp)->prev_job)
4325 jmove(joff(jp)->prev_job);
4335 jp = (struct job *)((char *)jp + len);
4339 } while (--jq >= jp);
4344 * Return a new job structure.
4345 * Called with interrupts off.
4348 makejob(/*union node *node,*/ int nprocs)
4353 for (i = njobs, jp = jobtab; ; jp++) {
4360 if (jp->state != JOBDONE || !jp->waited)
4369 memset(jp, 0, sizeof(*jp));
4371 /* jp->jobctl is a bitfield.
4372 * "jp->jobctl |= jobctl" likely to give awful code */
4376 jp->prev_job = curjob;
4381 jp->ps = ckmalloc(nprocs * sizeof(struct procstat));
4383 TRACE(("makejob(%d) returns %%%d\n", nprocs,
4390 * Return a string identifying a command (to be printed by the
4393 static char *cmdnextc;
4396 cmdputs(const char *s)
4398 static const char vstype[VSTYPE + 1][3] = {
4399 "", "}", "-", "+", "?", "=",
4400 "%", "%%", "#", "##"
4401 IF_ASH_BASH_COMPAT(, ":", "/", "//")
4404 const char *p, *str;
4408 unsigned char subtype = 0;
4412 nextc = makestrspace((strlen(s) + 1) * 8, cmdnextc);
4414 while ((c = *p++) != '\0') {
4422 if ((subtype & VSTYPE) == VSLENGTH)
4428 str = "\"}" + !(quoted & 1);
4435 #if ENABLE_SH_MATH_SUPPORT
4450 if ((subtype & VSTYPE) != VSNORMAL)
4452 str = vstype[subtype & VSTYPE];
4453 if (subtype & VSNUL)
4462 /* These can only happen inside quotes */
4475 while ((c = *str++) != '\0') {
4478 } /* while *p++ not NUL */
4481 USTPUTC('"', nextc);
4487 /* cmdtxt() and cmdlist() call each other */
4488 static void cmdtxt(union node *n);
4491 cmdlist(union node *np, int sep)
4493 for (; np; np = np->narg.next) {
4497 if (sep && np->narg.next)
4503 cmdtxt(union node *n)
4506 struct nodelist *lp;
4517 lp = n->npipe.cmdlist;
4535 cmdtxt(n->nbinary.ch1);
4551 cmdtxt(n->nif.test);
4553 if (n->nif.elsepart) {
4554 cmdtxt(n->nif.ifpart);
4556 n = n->nif.elsepart;
4574 cmdtxt(n->nbinary.ch1);
4584 cmdputs(n->nfor.var);
4586 cmdlist(n->nfor.args, 1);
4591 cmdputs(n->narg.text);
4595 cmdlist(n->ncmd.args, 1);
4596 cmdlist(n->ncmd.redirect, 0);
4609 cmdputs(n->ncase.expr->narg.text);
4611 for (np = n->ncase.cases; np; np = np->nclist.next) {
4612 cmdtxt(np->nclist.pattern);
4614 cmdtxt(np->nclist.body);
4628 #if ENABLE_ASH_BASH_COMPAT
4643 cmdputs(utoa(n->nfile.fd));
4645 if (n->type == NTOFD || n->type == NFROMFD) {
4646 cmdputs(utoa(n->ndup.dupfd));
4655 commandtext(union node *n)
4659 STARTSTACKSTR(cmdnextc);
4661 name = stackblock();
4662 TRACE(("commandtext: name %p, end %p\n", name, cmdnextc));
4663 return ckstrdup(name);
4668 * Fork off a subshell. If we are doing job control, give the subshell its
4669 * own process group. Jp is a job structure that the job is to be added to.
4670 * N is the command that will be evaluated by the child. Both jp and n may
4671 * be NULL. The mode parameter can be one of the following:
4672 * FORK_FG - Fork off a foreground process.
4673 * FORK_BG - Fork off a background process.
4674 * FORK_NOJOB - Like FORK_FG, but don't give the process its own
4675 * process group even if job control is on.
4677 * When job control is turned off, background processes have their standard
4678 * input redirected to /dev/null (except for the second and later processes
4681 * Called with interrupts off.
4684 * Clear traps on a fork.
4691 for (tp = trap; tp < &trap[NSIG]; tp++) {
4692 if (*tp && **tp) { /* trap not NULL or "" (SIG_IGN) */
4694 if (trap_ptr == trap)
4696 /* else: it "belongs" to trap_ptr vector, don't free */
4698 if ((tp - trap) != 0)
4699 setsignal(tp - trap);
4706 /* Lives far away from here, needed for forkchild */
4707 static void closescript(void);
4709 /* Called after fork(), in child */
4710 static NOINLINE void
4711 forkchild(struct job *jp, union node *n, int mode)
4715 TRACE(("Child shell %d\n", getpid()));
4719 /* man bash: "Non-builtin commands run by bash have signal handlers
4720 * set to the values inherited by the shell from its parent".
4721 * Do we do it correctly? */
4725 if (mode == FORK_NOJOB /* is it `xxx` ? */
4726 && n && n->type == NCMD /* is it single cmd? */
4727 /* && n->ncmd.args->type == NARG - always true? */
4728 && n->ncmd.args && strcmp(n->ncmd.args->narg.text, "trap") == 0
4729 && n->ncmd.args->narg.next == NULL /* "trap" with no arguments */
4730 /* && n->ncmd.args->narg.backquote == NULL - do we need to check this? */
4732 TRACE(("Trap hack\n"));
4733 /* Awful hack for `trap` or $(trap).
4735 * http://www.opengroup.org/onlinepubs/009695399/utilities/trap.html
4736 * contains an example where "trap" is executed in a subshell:
4738 * save_traps=$(trap)
4740 * eval "$save_traps"
4742 * Standard does not say that "trap" in subshell shall print
4743 * parent shell's traps. It only says that its output
4744 * must have suitable form, but then, in the above example
4745 * (which is not supposed to be normative), it implies that.
4747 * bash (and probably other shell) does implement it
4748 * (traps are reset to defaults, but "trap" still shows them),
4749 * but as a result, "trap" logic is hopelessly messed up:
4752 * trap -- 'echo Ho' SIGWINCH <--- we have a handler
4753 * # (trap) <--- trap is in subshell - no output (correct, traps are reset)
4754 * # true | trap <--- trap is in subshell - no output (ditto)
4755 * # echo `true | trap` <--- in subshell - output (but traps are reset!)
4756 * trap -- 'echo Ho' SIGWINCH
4757 * # echo `(trap)` <--- in subshell in subshell - output
4758 * trap -- 'echo Ho' SIGWINCH
4759 * # echo `true | (trap)` <--- in subshell in subshell in subshell - output!
4760 * trap -- 'echo Ho' SIGWINCH
4762 * The rules when to forget and when to not forget traps
4763 * get really complex and nonsensical.
4765 * Our solution: ONLY bare $(trap) or `trap` is special.
4767 /* Save trap handler strings for trap builtin to print */
4768 trap_ptr = xmemdup(trap, sizeof(trap));
4769 /* Fall through into clearing traps */
4773 /* do job control only in root shell */
4775 if (mode != FORK_NOJOB && jp->jobctl && oldlvl == 0) {
4778 if (jp->nprocs == 0)
4781 pgrp = jp->ps[0].ps_pid;
4782 /* this can fail because we are doing it in the parent also */
4784 if (mode == FORK_FG)
4785 xtcsetpgrp(ttyfd, pgrp);
4790 if (mode == FORK_BG) {
4791 /* man bash: "When job control is not in effect,
4792 * asynchronous commands ignore SIGINT and SIGQUIT" */
4795 if (jp->nprocs == 0) {
4797 if (open(bb_dev_null, O_RDONLY) != 0)
4798 ash_msg_and_raise_error("can't open '%s'", bb_dev_null);
4802 if (iflag) { /* why if iflag only? */
4807 * "In all cases, bash ignores SIGQUIT. Non-builtin
4808 * commands run by bash have signal handlers
4809 * set to the values inherited by the shell
4811 * Take care of the second rule: */
4815 if (n && n->type == NCMD
4816 && n->ncmd.args && strcmp(n->ncmd.args->narg.text, "jobs") == 0
4818 TRACE(("Job hack\n"));
4819 /* "jobs": we do not want to clear job list for it,
4820 * instead we remove only _its_ own_ job from job list.
4821 * This makes "jobs .... | cat" more useful.
4827 for (jp = curjob; jp; jp = jp->prev_job)
4832 /* Called after fork(), in parent */
4834 #define forkparent(jp, n, mode, pid) forkparent(jp, mode, pid)
4837 forkparent(struct job *jp, union node *n, int mode, pid_t pid)
4839 TRACE(("In parent shell: child = %d\n", pid));
4841 while (jobless && dowait(DOWAIT_NONBLOCK, NULL) > 0)
4847 if (mode != FORK_NOJOB && jp->jobctl) {
4850 if (jp->nprocs == 0)
4853 pgrp = jp->ps[0].ps_pid;
4854 /* This can fail because we are doing it in the child also */
4858 if (mode == FORK_BG) {
4859 backgndpid = pid; /* set $! */
4860 set_curjob(jp, CUR_RUNNING);
4863 struct procstat *ps = &jp->ps[jp->nprocs++];
4866 ps->ps_cmd = nullstr;
4868 if (doing_jobctl && n)
4869 ps->ps_cmd = commandtext(n);
4875 forkshell(struct job *jp, union node *n, int mode)
4879 TRACE(("forkshell(%%%d, %p, %d) called\n", jobno(jp), n, mode));
4882 TRACE(("Fork failed, errno=%d", errno));
4885 ash_msg_and_raise_error("can't fork");
4888 CLEAR_RANDOM_T(&random_gen); /* or else $RANDOM repeats in child */
4889 forkchild(jp, n, mode);
4891 forkparent(jp, n, mode, pid);
4897 * Wait for job to finish.
4899 * Under job control we have the problem that while a child process
4900 * is running interrupts generated by the user are sent to the child
4901 * but not to the shell. This means that an infinite loop started by
4902 * an interactive user may be hard to kill. With job control turned off,
4903 * an interactive user may place an interactive program inside a loop.
4904 * If the interactive program catches interrupts, the user doesn't want
4905 * these interrupts to also abort the loop. The approach we take here
4906 * is to have the shell ignore interrupt signals while waiting for a
4907 * foreground process to terminate, and then send itself an interrupt
4908 * signal if the child process was terminated by an interrupt signal.
4909 * Unfortunately, some programs want to do a bit of cleanup and then
4910 * exit on interrupt; unless these processes terminate themselves by
4911 * sending a signal to themselves (instead of calling exit) they will
4912 * confuse this approach.
4914 * Called with interrupts off.
4917 waitforjob(struct job *jp)
4921 TRACE(("waitforjob(%%%d) called\n", jobno(jp)));
4924 while (jp->state == JOBRUNNING) {
4925 /* In non-interactive shells, we _can_ get
4926 * a keyboard signal here and be EINTRed,
4927 * but we just loop back, waiting for command to complete.
4930 * "If bash is waiting for a command to complete and receives
4931 * a signal for which a trap has been set, the trap
4932 * will not be executed until the command completes."
4934 * Reality is that even if trap is not set, bash
4935 * will not act on the signal until command completes.
4936 * Try this. sleep5intoff.c:
4937 * #include <signal.h>
4938 * #include <unistd.h>
4941 * sigemptyset(&set);
4942 * sigaddset(&set, SIGINT);
4943 * sigaddset(&set, SIGQUIT);
4944 * sigprocmask(SIG_BLOCK, &set, NULL);
4948 * $ bash -c './sleep5intoff; echo hi'
4949 * ^C^C^C^C <--- pressing ^C once a second
4951 * $ bash -c './sleep5intoff; echo hi'
4952 * ^\^\^\^\hi <--- pressing ^\ (SIGQUIT)
4955 dowait(DOWAIT_BLOCK, jp);
4962 xtcsetpgrp(ttyfd, rootpid);
4964 * This is truly gross.
4965 * If we're doing job control, then we did a TIOCSPGRP which
4966 * caused us (the shell) to no longer be in the controlling
4967 * session -- so we wouldn't have seen any ^C/SIGINT. So, we
4968 * intuit from the subprocess exit status whether a SIGINT
4969 * occurred, and if so interrupt ourselves. Yuck. - mycroft
4971 if (jp->sigint) /* TODO: do the same with all signals */
4972 raise(SIGINT); /* ... by raise(jp->sig) instead? */
4974 if (jp->state == JOBDONE)
4981 * return 1 if there are stopped jobs, otherwise 0
4993 if (jp && jp->state == JOBSTOPPED) {
4994 out2str("You have stopped jobs.\n");
5003 /* ============ redir.c
5005 * Code for dealing with input/output redirection.
5010 #define EMPTY -2 /* marks an unused slot in redirtab */
5011 #define CLOSED -3 /* marks a slot of previously-closed fd */
5014 * Open a file in noclobber mode.
5015 * The code was copied from bash.
5018 noclobberopen(const char *fname)
5021 struct stat finfo, finfo2;
5024 * If the file exists and is a regular file, return an error
5027 r = stat(fname, &finfo);
5028 if (r == 0 && S_ISREG(finfo.st_mode)) {
5034 * If the file was not present (r != 0), make sure we open it
5035 * exclusively so that if it is created before we open it, our open
5036 * will fail. Make sure that we do not truncate an existing file.
5037 * Note that we don't turn on O_EXCL unless the stat failed -- if the
5038 * file was not a regular file, we leave O_EXCL off.
5041 return open(fname, O_WRONLY|O_CREAT|O_EXCL, 0666);
5042 fd = open(fname, O_WRONLY|O_CREAT, 0666);
5044 /* If the open failed, return the file descriptor right away. */
5049 * OK, the open succeeded, but the file may have been changed from a
5050 * non-regular file to a regular file between the stat and the open.
5051 * We are assuming that the O_EXCL open handles the case where FILENAME
5052 * did not exist and is symlinked to an existing file between the stat
5057 * If we can open it and fstat the file descriptor, and neither check
5058 * revealed that it was a regular file, and the file has not been
5059 * replaced, return the file descriptor.
5061 if (fstat(fd, &finfo2) == 0
5062 && !S_ISREG(finfo2.st_mode)
5063 && finfo.st_dev == finfo2.st_dev
5064 && finfo.st_ino == finfo2.st_ino
5069 /* The file has been replaced. badness. */
5076 * Handle here documents. Normally we fork off a process to write the
5077 * data to a pipe. If the document is short, we can stuff the data in
5078 * the pipe without forking.
5080 /* openhere needs this forward reference */
5081 static void expandhere(union node *arg, int fd);
5083 openhere(union node *redir)
5089 ash_msg_and_raise_error("pipe call failed");
5090 if (redir->type == NHERE) {
5091 len = strlen(redir->nhere.doc->narg.text);
5092 if (len <= PIPE_BUF) {
5093 full_write(pip[1], redir->nhere.doc->narg.text, len);
5097 if (forkshell((struct job *)NULL, (union node *)NULL, FORK_NOJOB) == 0) {
5100 ignoresig(SIGINT); //signal(SIGINT, SIG_IGN);
5101 ignoresig(SIGQUIT); //signal(SIGQUIT, SIG_IGN);
5102 ignoresig(SIGHUP); //signal(SIGHUP, SIG_IGN);
5103 ignoresig(SIGTSTP); //signal(SIGTSTP, SIG_IGN);
5104 signal(SIGPIPE, SIG_DFL);
5105 if (redir->type == NHERE)
5106 full_write(pip[1], redir->nhere.doc->narg.text, len);
5108 expandhere(redir->nhere.doc, pip[1]);
5109 _exit(EXIT_SUCCESS);
5117 openredirect(union node *redir)
5122 switch (redir->nfile.type) {
5123 /* Can't happen, our single caller does this itself */
5129 return openhere(redir);
5132 /* For N[X]HERE, reading redir->nfile.expfname would touch beyond
5133 * allocated space. Do it only when we know it is safe.
5135 fname = redir->nfile.expfname;
5137 switch (redir->nfile.type) {
5143 f = open(fname, O_RDONLY);
5148 f = open(fname, O_RDWR|O_CREAT, 0666);
5153 #if ENABLE_ASH_BASH_COMPAT
5156 /* Take care of noclobber mode. */
5158 f = noclobberopen(fname);
5165 f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666);
5170 f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666);
5178 ash_msg_and_raise_error("can't create %s: %s", fname, errmsg(errno, "nonexistent directory"));
5180 ash_msg_and_raise_error("can't open %s: %s", fname, errmsg(errno, "no such file"));
5184 * Copy a file descriptor to be >= 10. Throws exception on error.
5192 newfd = fcntl(from, F_DUPFD, 10);
5193 err = newfd < 0 ? errno : 0;
5196 ash_msg_and_raise_error("%d: %m", from);
5198 fcntl(newfd, F_SETFD, FD_CLOEXEC);
5204 dup2_or_raise(int from, int to)
5208 newfd = (from != to) ? dup2(from, to) : to;
5210 /* Happens when source fd is not open: try "echo >&99" */
5211 ash_msg_and_raise_error("%d: %m", from);
5216 /* Struct def and variable are moved down to the first usage site */
5221 struct redirtab *next;
5223 struct two_fd_t two_fd[];
5225 #define redirlist (G_var.redirlist)
5227 COPYFD_RESTORE = (int)~(INT_MAX),
5231 need_to_remember(struct redirtab *rp, int fd)
5235 if (!rp) /* remembering was not requested */
5238 for (i = 0; i < rp->pair_count; i++) {
5239 if (rp->two_fd[i].orig == fd) {
5240 /* already remembered */
5247 /* "hidden" fd is a fd used to read scripts, or a copy of such */
5249 is_hidden_fd(struct redirtab *rp, int fd)
5252 struct parsefile *pf;
5256 /* Check open scripts' fds */
5259 /* We skip pf_fd == 0 case because of the following case:
5260 * $ ash # running ash interactively
5262 * and in script.sh: "exec 9>&0".
5263 * Even though top-level pf_fd _is_ 0,
5264 * it's still ok to use it: "read" builtin uses it,
5265 * why should we cripple "exec" builtin?
5267 if (pf->pf_fd > 0 && fd == pf->pf_fd) {
5275 /* Check saved fds of redirects */
5276 fd |= COPYFD_RESTORE;
5277 for (i = 0; i < rp->pair_count; i++) {
5278 if (rp->two_fd[i].copy == fd) {
5286 * Process a list of redirection commands. If the REDIR_PUSH flag is set,
5287 * old file descriptors are stashed away so that the redirection can be
5288 * undone by calling popredir.
5290 /* flags passed to redirect */
5291 #define REDIR_PUSH 01 /* save previous values of file descriptors */
5292 #define REDIR_SAVEFD2 03 /* set preverrout */
5294 redirect(union node *redir, int flags)
5296 struct redirtab *sv;
5301 int copied_fd2 = -1;
5310 if (flags & REDIR_PUSH) {
5311 union node *tmp = redir;
5314 #if ENABLE_ASH_BASH_COMPAT
5315 if (tmp->nfile.type == NTO2)
5318 tmp = tmp->nfile.next;
5320 sv = ckmalloc(sizeof(*sv) + sv_pos * sizeof(sv->two_fd[0]));
5321 sv->next = redirlist;
5322 sv->pair_count = sv_pos;
5324 while (sv_pos > 0) {
5326 sv->two_fd[sv_pos].orig = sv->two_fd[sv_pos].copy = EMPTY;
5332 fd = redir->nfile.fd;
5333 if (redir->nfile.type == NTOFD || redir->nfile.type == NFROMFD) {
5334 right_fd = redir->ndup.dupfd;
5335 //bb_error_msg("doing %d > %d", fd, right_fd);
5336 /* redirect from/to same file descriptor? */
5339 /* "echo >&10" and 10 is a fd opened to a sh script? */
5340 if (is_hidden_fd(sv, right_fd)) {
5341 errno = EBADF; /* as if it is closed */
5342 ash_msg_and_raise_error("%d: %m", right_fd);
5346 newfd = openredirect(redir); /* always >= 0 */
5348 /* Descriptor wasn't open before redirect.
5349 * Mark it for close in the future */
5350 if (need_to_remember(sv, fd)) {
5351 goto remember_to_close;
5356 #if ENABLE_ASH_BASH_COMPAT
5359 if (need_to_remember(sv, fd)) {
5360 /* Copy old descriptor */
5361 /* Careful to not accidentally "save"
5362 * to the same fd as right side fd in N>&M */
5363 int minfd = right_fd < 10 ? 10 : right_fd + 1;
5364 i = fcntl(fd, F_DUPFD, minfd);
5365 /* You'd expect copy to be CLOEXECed. Currently these extra "saved" fds
5366 * are closed in popredir() in the child, preventing them from leaking
5367 * into child. (popredir() also cleans up the mess in case of failures)
5372 /* Strange error (e.g. "too many files" EMFILE?) */
5376 ash_msg_and_raise_error("%d: %m", fd);
5379 /* EBADF: it is not open - good, remember to close it */
5382 } else { /* fd is open, save its copy */
5383 /* "exec fd>&-" should not close fds
5384 * which point to script file(s).
5385 * Force them to be restored afterwards */
5386 if (is_hidden_fd(sv, fd))
5387 i |= COPYFD_RESTORE;
5391 sv->two_fd[sv_pos].orig = fd;
5392 sv->two_fd[sv_pos].copy = i;
5396 /* NTOFD/NFROMFD: copy redir->ndup.dupfd to fd */
5397 if (redir->ndup.dupfd < 0) { /* "fd>&-" */
5398 /* Don't want to trigger debugging */
5402 dup2_or_raise(redir->ndup.dupfd, fd);
5404 } else if (fd != newfd) { /* move newfd to fd */
5405 dup2_or_raise(newfd, fd);
5406 #if ENABLE_ASH_BASH_COMPAT
5407 if (!(redir->nfile.type == NTO2 && fd == 2))
5411 #if ENABLE_ASH_BASH_COMPAT
5412 if (redir->nfile.type == NTO2 && fd == 1) {
5413 /* We already redirected it to fd 1, now copy it to 2 */
5419 } while ((redir = redir->nfile.next) != NULL);
5422 if ((flags & REDIR_SAVEFD2) && copied_fd2 >= 0)
5423 preverrout_fd = copied_fd2;
5427 * Undo the effects of the last redirection.
5430 popredir(int drop, int restore)
5432 struct redirtab *rp;
5435 if (redirlist == NULL)
5439 for (i = 0; i < rp->pair_count; i++) {
5440 int fd = rp->two_fd[i].orig;
5441 int copy = rp->two_fd[i].copy;
5442 if (copy == CLOSED) {
5447 if (copy != EMPTY) {
5448 if (!drop || (restore && (copy & COPYFD_RESTORE))) {
5449 copy &= ~COPYFD_RESTORE;
5451 dup2_or_raise(copy, fd);
5453 close(copy & ~COPYFD_RESTORE);
5456 redirlist = rp->next;
5462 * Undo all redirections. Called on error or interrupt.
5466 redirectsafe(union node *redir, int flags)
5469 volatile int saveint;
5470 struct jmploc *volatile savehandler = exception_handler;
5471 struct jmploc jmploc;
5474 /* "echo 9>/dev/null; echo >&9; echo result: $?" - result should be 1, not 2! */
5475 err = setjmp(jmploc.loc); // huh?? was = setjmp(jmploc.loc) * 2;
5477 exception_handler = &jmploc;
5478 redirect(redir, flags);
5480 exception_handler = savehandler;
5481 if (err && exception_type != EXERROR)
5482 longjmp(exception_handler->loc, 1);
5483 RESTORE_INT(saveint);
5488 /* ============ Routines to expand arguments to commands
5490 * We have to deal with backquotes, shell variables, and file metacharacters.
5493 #if ENABLE_SH_MATH_SUPPORT
5495 ash_arith(const char *s)
5497 arith_state_t math_state;
5500 math_state.lookupvar = lookupvar;
5501 math_state.setvar = setvar0;
5502 //math_state.endofname = endofname;
5505 result = arith(&math_state, s);
5506 if (math_state.errmsg)
5507 ash_msg_and_raise_error(math_state.errmsg);
5517 #define EXP_FULL 0x1 /* perform word splitting & file globbing */
5518 #define EXP_TILDE 0x2 /* do normal tilde expansion */
5519 #define EXP_VARTILDE 0x4 /* expand tildes in an assignment */
5520 #define EXP_REDIR 0x8 /* file glob for a redirection (1 match only) */
5521 /* ^^^^^^^^^^^^^^ this is meant to support constructs such as "cmd >file*.txt"
5522 * POSIX says for this case:
5523 * Pathname expansion shall not be performed on the word by a
5524 * non-interactive shell; an interactive shell may perform it, but shall
5525 * do so only when the expansion would result in one word.
5526 * Currently, our code complies to the above rule by never globbing
5527 * redirection filenames.
5528 * Bash performs globbing, unless it is non-interactive and in POSIX mode.
5529 * (this means that on a typical Linux distro, bash almost always
5530 * performs globbing, and thus diverges from what we do).
5532 #define EXP_CASE 0x10 /* keeps quotes around for CASE pattern */
5533 #define EXP_QPAT 0x20 /* pattern in quoted parameter expansion */
5534 #define EXP_VARTILDE2 0x40 /* expand tildes after colons only */
5535 #define EXP_WORD 0x80 /* expand word in parameter expansion */
5536 #define EXP_QUOTED 0x100 /* expand word in double quotes */
5540 #define RMESCAPE_ALLOC 0x1 /* Allocate a new string */
5541 #define RMESCAPE_GLOB 0x2 /* Add backslashes for glob */
5542 #define RMESCAPE_GROW 0x8 /* Grow strings instead of stalloc */
5543 #define RMESCAPE_HEAP 0x10 /* Malloc strings instead of stalloc */
5544 #define RMESCAPE_SLASH 0x20 /* Stop globbing after slash */
5546 /* Add CTLESC when necessary. */
5547 #define QUOTES_ESC (EXP_FULL | EXP_CASE | EXP_QPAT | EXP_REDIR)
5548 /* Do not skip NUL characters. */
5549 #define QUOTES_KEEPNUL EXP_TILDE
5552 * Structure specifying which parts of the string should be searched
5553 * for IFS characters.
5556 struct ifsregion *next; /* next region in list */
5557 int begoff; /* offset of start of region */
5558 int endoff; /* offset of end of region */
5559 int nulonly; /* search for nul bytes only */
5563 struct strlist *list;
5564 struct strlist **lastp;
5567 /* output of current string */
5568 static char *expdest;
5569 /* list of back quote expressions */
5570 static struct nodelist *argbackq;
5571 /* first struct in list of ifs regions */
5572 static struct ifsregion ifsfirst;
5573 /* last struct in list */
5574 static struct ifsregion *ifslastp;
5575 /* holds expanded arg list */
5576 static struct arglist exparg;
5581 #if !ENABLE_SH_MATH_SUPPORT
5582 /* cvtnum() is used even if math support is off (to prepare $? values and such) */
5583 typedef long arith_t;
5584 # define ARITH_FMT "%ld"
5591 expdest = makestrspace(sizeof(arith_t)*3 + 2, expdest);
5592 len = fmtstr(expdest, sizeof(arith_t)*3 + 2, ARITH_FMT, num);
5593 STADJUST(len, expdest);
5598 esclen(const char *start, const char *p)
5602 while (p > start && (unsigned char)*--p == CTLESC) {
5609 * Remove any CTLESC characters from a string.
5612 rmescapes(char *str, int flag)
5614 static const char qchars[] ALIGN1 = {
5615 IF_ASH_BASH_COMPAT('/',) CTLESC, CTLQUOTEMARK, '\0' };
5619 unsigned protect_against_glob;
5621 IF_ASH_BASH_COMPAT(unsigned slash = flag & RMESCAPE_SLASH;)
5623 p = strpbrk(str, qchars IF_ASH_BASH_COMPAT(+ !slash));
5629 if (flag & RMESCAPE_ALLOC) {
5630 size_t len = p - str;
5631 size_t fulllen = len + strlen(p) + 1;
5633 if (flag & RMESCAPE_GROW) {
5634 int strloc = str - (char *)stackblock();
5635 r = makestrspace(fulllen, expdest);
5636 /* p and str may be invalidated by makestrspace */
5637 str = (char *)stackblock() + strloc;
5639 } else if (flag & RMESCAPE_HEAP) {
5640 r = ckmalloc(fulllen);
5642 r = stalloc(fulllen);
5646 q = (char *)memcpy(q, str, len) + len;
5651 globbing = flag & RMESCAPE_GLOB;
5652 protect_against_glob = globbing;
5654 if ((unsigned char)*p == CTLQUOTEMARK) {
5655 // Note: both inquotes and protect_against_glob only affect whether
5656 inquotes = ~inquotes;
5658 protect_against_glob = globbing;
5661 if ((unsigned char)*p == CTLESC) {
5665 ash_msg_and_raise_error("CTLESC at EOL (shouldn't happen)");
5667 if (protect_against_glob) {
5670 } else if (*p == '\\' && !inquotes) {
5671 /* naked back slash */
5672 protect_against_glob = 0;
5675 #if ENABLE_ASH_BASH_COMPAT
5676 else if (*p == '/' && slash) {
5677 /* stop handling globbing and mark location of slash */
5678 globbing = slash = 0;
5682 protect_against_glob = globbing;
5687 if (flag & RMESCAPE_GROW) {
5689 STADJUST(q - r + 1, expdest);
5693 #define pmatch(a, b) !fnmatch((a), (b), 0)
5696 * Prepare a pattern for a expmeta (internal glob(3)) call.
5698 * Returns an stalloced string.
5701 preglob(const char *pattern, int flag)
5703 return rmescapes((char *)pattern, flag | RMESCAPE_GLOB);
5707 * Put a string on the stack.
5710 memtodest(const char *p, size_t len, int syntax, int quotes)
5717 q = makestrspace((quotes & QUOTES_ESC) ? len * 2 : len, expdest);
5720 unsigned char c = *p++;
5722 int n = SIT(c, syntax);
5723 if ((quotes & QUOTES_ESC)
5725 || (((quotes & EXP_FULL) || syntax != BASESYNTAX)
5731 } else if (!(quotes & QUOTES_KEEPNUL))
5740 strtodest(const char *p, int syntax, int quotes)
5742 size_t len = strlen(p);
5743 memtodest(p, len, syntax, quotes);
5748 * Record the fact that we have to scan this region of the
5749 * string for IFS characters.
5752 recordregion(int start, int end, int nulonly)
5754 struct ifsregion *ifsp;
5756 if (ifslastp == NULL) {
5760 ifsp = ckzalloc(sizeof(*ifsp));
5761 /*ifsp->next = NULL; - ckzalloc did it */
5762 ifslastp->next = ifsp;
5766 ifslastp->begoff = start;
5767 ifslastp->endoff = end;
5768 ifslastp->nulonly = nulonly;
5772 removerecordregions(int endoff)
5774 if (ifslastp == NULL)
5777 if (ifsfirst.endoff > endoff) {
5778 while (ifsfirst.next) {
5779 struct ifsregion *ifsp;
5781 ifsp = ifsfirst.next->next;
5782 free(ifsfirst.next);
5783 ifsfirst.next = ifsp;
5786 if (ifsfirst.begoff > endoff) {
5789 ifslastp = &ifsfirst;
5790 ifsfirst.endoff = endoff;
5795 ifslastp = &ifsfirst;
5796 while (ifslastp->next && ifslastp->next->begoff < endoff)
5797 ifslastp = ifslastp->next;
5798 while (ifslastp->next) {
5799 struct ifsregion *ifsp;
5801 ifsp = ifslastp->next->next;
5802 free(ifslastp->next);
5803 ifslastp->next = ifsp;
5806 if (ifslastp->endoff > endoff)
5807 ifslastp->endoff = endoff;
5811 exptilde(char *startp, char *p, int flags)
5817 int quotes = flags & QUOTES_ESC;
5821 while ((c = *++p) != '\0') {
5828 if (flags & EXP_VARTILDE)
5838 if (*name == '\0') {
5839 home = lookupvar("HOME");
5841 pw = getpwnam(name);
5846 if (!home || !*home)
5849 strtodest(home, SQSYNTAX, quotes);
5857 * Execute a command inside back quotes. If it's a builtin command, we
5858 * want to save its output in a block obtained from malloc. Otherwise
5859 * we fork off a subprocess and get the output of the command via a pipe.
5860 * Should be called with interrupts off.
5862 struct backcmd { /* result of evalbackcmd */
5863 int fd; /* file descriptor to read from */
5864 int nleft; /* number of chars in buffer */
5865 char *buf; /* buffer */
5866 struct job *jp; /* job structure for command */
5869 /* These forward decls are needed to use "eval" code for backticks handling: */
5870 #define EV_EXIT 01 /* exit after evaluating tree */
5871 static int evaltree(union node *, int);
5873 static void FAST_FUNC
5874 evalbackcmd(union node *n, struct backcmd *result)
5888 ash_msg_and_raise_error("pipe call failed");
5889 jp = makejob(/*n,*/ 1);
5890 if (forkshell(jp, n, FORK_NOJOB) == 0) {
5895 dup2_or_raise(pip[1], 1);
5898 /* TODO: eflag clearing makes the following not abort:
5899 * ash -c 'set -e; z=$(false;echo foo); echo $z'
5900 * which is what bash does (unless it is in POSIX mode).
5901 * dash deleted "eflag = 0" line in the commit
5902 * Date: Mon, 28 Jun 2010 17:11:58 +1000
5903 * [EVAL] Don't clear eflag in evalbackcmd
5904 * For now, preserve bash-like behavior, it seems to be somewhat more useful:
5907 evaltree(n, EV_EXIT); /* actually evaltreenr... */
5911 result->fd = pip[0];
5915 TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n",
5916 result->fd, result->buf, result->nleft, result->jp));
5920 * Expand stuff in backwards quotes.
5923 expbackq(union node *cmd, int flag)
5931 int syntax = flag & EXP_QUOTED ? DQSYNTAX : BASESYNTAX;
5932 struct stackmark smark;
5935 startloc = expdest - (char *)stackblock();
5936 pushstackmark(&smark, startloc);
5937 evalbackcmd(cmd, &in);
5938 popstackmark(&smark);
5945 memtodest(p, i, syntax, flag & QUOTES_ESC);
5949 i = nonblock_immune_read(in.fd, buf, sizeof(buf));
5950 TRACE(("expbackq: read returns %d\n", i));
5959 back_exitstatus = waitforjob(in.jp);
5963 /* Eat all trailing newlines */
5965 for (; dest > (char *)stackblock() && dest[-1] == '\n';)
5969 if (!(flag & EXP_QUOTED))
5970 recordregion(startloc, dest - (char *)stackblock(), 0);
5971 TRACE(("evalbackq: size:%d:'%.*s'\n",
5972 (int)((dest - (char *)stackblock()) - startloc),
5973 (int)((dest - (char *)stackblock()) - startloc),
5974 stackblock() + startloc));
5977 #if ENABLE_SH_MATH_SUPPORT
5979 * Expand arithmetic expression. Backup to start of expression,
5980 * evaluate, place result in (backed up) result, adjust string position.
5992 * This routine is slightly over-complicated for
5993 * efficiency. Next we scan backwards looking for the
5994 * start of arithmetic.
5996 start = stackblock();
6003 while ((unsigned char)*p != CTLARI) {
6007 ash_msg_and_raise_error("missing CTLARI (shouldn't happen)");
6012 esc = esclen(start, p);
6022 removerecordregions(begoff);
6026 if (flag & QUOTES_ESC)
6027 rmescapes(p + 1, 0);
6029 len = cvtnum(ash_arith(p + 1));
6031 if (!(flag & EXP_QUOTED))
6032 recordregion(begoff, begoff + len, 0);
6036 /* argstr needs it */
6037 static char *evalvar(char *p, int flags, struct strlist *var_str_list);
6040 * Perform variable and command substitution. If EXP_FULL is set, output CTLESC
6041 * characters to allow for further processing. Otherwise treat
6042 * $@ like $* since no splitting will be performed.
6044 * var_str_list (can be NULL) is a list of "VAR=val" strings which take precedence
6045 * over shell varables. Needed for "A=a B=$A; echo $B" case - we use it
6046 * for correct expansion of "B=$A" word.
6049 argstr(char *p, int flags, struct strlist *var_str_list)
6051 static const char spclchars[] ALIGN1 = {
6059 #if ENABLE_SH_MATH_SUPPORT
6064 const char *reject = spclchars;
6065 int breakall = (flags & (EXP_WORD | EXP_QUOTED)) == EXP_WORD;
6070 if (!(flags & EXP_VARTILDE)) {
6072 } else if (flags & EXP_VARTILDE2) {
6077 if (flags & EXP_TILDE) {
6080 flags &= ~EXP_TILDE;
6084 p = exptilde(p, q, flags);
6087 startloc = expdest - (char *)stackblock();
6091 length += strcspn(p + length, reject);
6095 IF_SH_MATH_SUPPORT(|| c == CTLENDARI)
6097 /* c == '=' || c == ':' || c == CTLENDARI */
6103 expdest = stack_nputstr(p, length, expdest);
6104 newloc = expdest - (char *)stackblock();
6105 if (breakall && !inquotes && newloc > startloc) {
6106 recordregion(startloc, newloc, 0);
6117 if (flags & EXP_VARTILDE2) {
6121 flags |= EXP_VARTILDE2;
6126 * sort of a hack - expand tildes in variable
6127 * assignments (after the first '=' and after ':'s).
6136 case CTLENDVAR: /* ??? */
6139 inquotes ^= EXP_QUOTED;
6140 /* "$@" syntax adherence hack */
6141 if (inquotes && !memcmp(p, dolatstr + 1, DOLATSTRLEN - 1)) {
6142 p = evalvar(p + 1, flags | inquotes, /* var_str_list: */ NULL) + 1;
6146 if (flags & QUOTES_ESC) {
6157 * Quoted parameter expansion pattern: remove quote
6158 * unless inside inner quotes or we have a literal
6161 if (((flags | inquotes) & (EXP_QPAT | EXP_QUOTED)) ==
6162 EXP_QPAT && *p != '\\')
6167 TRACE(("argstr: evalvar('%s')\n", p));
6168 p = evalvar(p, flags | inquotes, var_str_list);
6169 TRACE(("argstr: evalvar:'%s'\n", (char *)stackblock()));
6172 expbackq(argbackq->n, flags | inquotes);
6173 argbackq = argbackq->next;
6175 #if ENABLE_SH_MATH_SUPPORT
6178 expari(flags | inquotes);
6187 scanleft(char *startp, char *rmesc, char *rmescend UNUSED_PARAM,
6188 char *pattern, int quotes, int zero)
6197 const char *s = loc2;
6204 match = pmatch(pattern, s);
6209 if (quotes && (unsigned char)*loc == CTLESC)
6218 scanright(char *startp, char *rmesc, char *rmescend,
6219 char *pattern, int quotes, int match_at_start)
6221 #if !ENABLE_ASH_OPTIMIZE_FOR_SIZE
6222 int try2optimize = match_at_start;
6228 /* If we called by "${v/pattern/repl}" or "${v//pattern/repl}":
6229 * startp="escaped_value_of_v" rmesc="raw_value_of_v"
6230 * rmescend=""(ptr to NUL in rmesc) pattern="pattern" quotes=match_at_start=1
6232 * loc starts at NUL at the end of startp, loc2 starts at the end of rmesc,
6233 * and on each iteration they go back two/one char until they reach the beginning.
6234 * We try to find a match in "raw_value_of_v", "raw_value_of_", "raw_value_of" etc.
6236 /* TODO: document in what other circumstances we are called. */
6238 for (loc = pattern - 1, loc2 = rmescend; loc >= startp; loc2--) {
6241 const char *s = loc2;
6242 if (match_at_start) {
6246 match = pmatch(pattern, s);
6247 //bb_error_msg("pmatch(pattern:'%s',s:'%s'):%d", pattern, s, match);
6251 #if !ENABLE_ASH_OPTIMIZE_FOR_SIZE
6253 /* Maybe we can optimize this:
6254 * if pattern ends with unescaped *, we can avoid checking
6255 * shorter strings: if "foo*" doesnt match "raw_value_of_v",
6256 * it wont match truncated "raw_value_of_" strings too.
6258 unsigned plen = strlen(pattern);
6259 /* Does it end with "*"? */
6260 if (plen != 0 && pattern[--plen] == '*') {
6261 /* "xxxx*" is not escaped */
6262 /* "xxx\*" is escaped */
6263 /* "xx\\*" is not escaped */
6264 /* "x\\\*" is escaped */
6266 while (plen != 0 && pattern[--plen] == '\\')
6269 break; /* ends with unescaped "*" */
6277 esc = esclen(startp, loc);
6288 static void varunset(const char *, const char *, const char *, int) NORETURN;
6290 varunset(const char *end, const char *var, const char *umsg, int varflags)
6296 msg = "parameter not set";
6298 if ((unsigned char)*end == CTLENDVAR) {
6299 if (varflags & VSNUL)
6305 ash_msg_and_raise_error("%.*s: %s%s", (int)(end - var - 1), var, msg, tail);
6309 subevalvar(char *p, char *varname, int strloc, int subtype,
6310 int startloc, int varflags, int flag, struct strlist *var_str_list)
6312 struct nodelist *saveargbackq = argbackq;
6313 int quotes = flag & QUOTES_ESC;
6316 char *rmesc, *rmescend;
6318 IF_ASH_BASH_COMPAT(char *repl = NULL;)
6319 IF_ASH_BASH_COMPAT(int pos, len, orig_len;)
6320 int amount, resetloc;
6321 IF_ASH_BASH_COMPAT(int workloc;)
6323 char *(*scan)(char*, char*, char*, char*, int, int);
6325 //bb_error_msg("subevalvar(p:'%s',varname:'%s',strloc:%d,subtype:%d,startloc:%d,varflags:%x,quotes:%d)",
6326 // p, varname, strloc, subtype, startloc, varflags, quotes);
6328 argstr(p, EXP_TILDE | (subtype != VSASSIGN && subtype != VSQUESTION ?
6329 (flag & (EXP_QUOTED | EXP_QPAT) ? EXP_QPAT : EXP_CASE) : 0),
6331 STPUTC('\0', expdest);
6332 argbackq = saveargbackq;
6333 startp = (char *)stackblock() + startloc;
6337 setvar0(varname, startp);
6338 amount = startp - expdest;
6339 STADJUST(amount, expdest);
6343 varunset(p, varname, startp, varflags);
6346 #if ENABLE_ASH_BASH_COMPAT
6348 //TODO: support more general format ${v:EXPR:EXPR},
6349 // where EXPR follows $(()) rules
6350 loc = str = stackblock() + strloc;
6351 /* Read POS in ${var:POS:LEN} */
6352 pos = atoi(loc); /* number(loc) errors out on "1:4" */
6353 len = str - startp - 1;
6355 /* *loc != '\0', guaranteed by parser */
6359 /* Adjust the length by the number of escapes */
6360 for (ptr = startp; ptr < (str - 1); ptr++) {
6361 if ((unsigned char)*ptr == CTLESC) {
6369 if (*loc++ == ':') {
6373 /* Skip POS in ${var:POS:LEN} */
6375 while (*loc && *loc != ':') {
6377 * bash complains on: var=qwe; echo ${var:1a:123}
6379 ash_msg_and_raise_error(msg_illnum, str);
6383 if (*loc++ == ':') {
6388 /* ${VAR:$((-n)):l} starts n chars from the end */
6389 pos = orig_len + pos;
6391 if ((unsigned)pos >= orig_len) {
6392 /* apart from obvious ${VAR:999999:l},
6393 * covers ${VAR:$((-9999999)):l} - result is ""
6399 if (len > (orig_len - pos))
6400 len = orig_len - pos;
6402 for (str = startp; pos; str++, pos--) {
6403 if (quotes && (unsigned char)*str == CTLESC)
6406 for (loc = startp; len; len--) {
6407 if (quotes && (unsigned char)*str == CTLESC)
6412 amount = loc - expdest;
6413 STADJUST(amount, expdest);
6418 resetloc = expdest - (char *)stackblock();
6420 /* We'll comeback here if we grow the stack while handling
6421 * a VSREPLACE or VSREPLACEALL, since our pointers into the
6422 * stack will need rebasing, and we'll need to remove our work
6425 IF_ASH_BASH_COMPAT(restart:)
6427 amount = expdest - ((char *)stackblock() + resetloc);
6428 STADJUST(-amount, expdest);
6429 startp = (char *)stackblock() + startloc;
6432 rmescend = (char *)stackblock() + strloc;
6434 rmesc = rmescapes(startp, RMESCAPE_ALLOC | RMESCAPE_GROW);
6435 if (rmesc != startp) {
6437 startp = (char *)stackblock() + startloc;
6441 str = (char *)stackblock() + strloc;
6443 * Example: v='a\bc'; echo ${v/\\b/_\\_\z_}
6444 * The result is a_\_z_c (not a\_\_z_c)!
6446 * The search pattern and replace string treat backslashes differently!
6447 * RMESCAPE_SLASH causes preglob to work differently on the pattern
6448 * and string. It's only used on the first call.
6450 preglob(str, IF_ASH_BASH_COMPAT(
6451 (subtype == VSREPLACE || subtype == VSREPLACEALL) && !repl ?
6452 RMESCAPE_SLASH :) 0);
6454 #if ENABLE_ASH_BASH_COMPAT
6455 workloc = expdest - (char *)stackblock();
6456 if (subtype == VSREPLACE || subtype == VSREPLACEALL) {
6460 repl = strchr(str, CTLESC);
6466 //bb_error_msg("str:'%s' repl:'%s'", str, repl);
6468 /* If there's no pattern to match, return the expansion unmolested */
6477 loc = scanright(idx, rmesc, rmescend, str, quotes, 1);
6478 //bb_error_msg("scanright('%s'):'%s'", str, loc);
6480 /* No match, advance */
6481 char *restart_detect = stackblock();
6483 STPUTC(*idx, expdest);
6484 if (quotes && (unsigned char)*idx == CTLESC) {
6487 STPUTC(*idx, expdest);
6489 if (stackblock() != restart_detect)
6494 /* continue; - prone to quadratic behavior, smarter code: */
6497 if (str[0] == '*') {
6498 /* Pattern is "*foo". If "*foo" does not match "long_string",
6499 * it would never match "ong_string" etc, no point in trying.
6506 if (subtype == VSREPLACEALL) {
6508 if (quotes && (unsigned char)*idx == CTLESC)
6517 //bb_error_msg("repl:'%s'", repl);
6518 for (loc = (char*)repl; *loc; loc++) {
6519 char *restart_detect = stackblock();
6520 if (quotes && *loc == '\\') {
6521 STPUTC(CTLESC, expdest);
6524 STPUTC(*loc, expdest);
6525 if (stackblock() != restart_detect)
6530 if (subtype == VSREPLACE) {
6531 //bb_error_msg("tail:'%s', quotes:%x", idx, quotes);
6533 char *restart_detect = stackblock();
6534 STPUTC(*idx, expdest);
6535 if (stackblock() != restart_detect)
6544 /* We've put the replaced text into a buffer at workloc, now
6545 * move it to the right place and adjust the stack.
6547 STPUTC('\0', expdest);
6548 startp = (char *)stackblock() + startloc;
6549 memmove(startp, (char *)stackblock() + workloc, len + 1);
6550 //bb_error_msg("startp:'%s'", startp);
6551 amount = expdest - (startp + len);
6552 STADJUST(-amount, expdest);
6555 #endif /* ENABLE_ASH_BASH_COMPAT */
6557 subtype -= VSTRIMRIGHT;
6559 if (subtype < 0 || subtype > 7)
6562 /* zero = (subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX) */
6563 zero = subtype >> 1;
6564 /* VSTRIMLEFT/VSTRIMRIGHTMAX -> scanleft */
6565 scan = (subtype & 1) ^ zero ? scanleft : scanright;
6567 loc = scan(startp, rmesc, rmescend, str, quotes, zero);
6570 memmove(startp, loc, str - loc);
6571 loc = startp + (str - loc) - 1;
6574 amount = loc - expdest;
6575 STADJUST(amount, expdest);
6581 * Add the value of a specialized variable to the stack string.
6582 * name parameter (examples):
6583 * ash -c 'echo $1' name:'1='
6584 * ash -c 'echo $qwe' name:'qwe='
6585 * ash -c 'echo $$' name:'$='
6586 * ash -c 'echo ${$}' name:'$='
6587 * ash -c 'echo ${$##q}' name:'$=q'
6588 * ash -c 'echo ${#$}' name:'$='
6589 * note: examples with bad shell syntax:
6590 * ash -c 'echo ${#$1}' name:'$=1'
6591 * ash -c 'echo ${#1#}' name:'1=#'
6593 static NOINLINE ssize_t
6594 varvalue(char *name, int varflags, int flags, struct strlist *var_str_list, int *quotedp)
6601 int quoted = *quotedp;
6602 int subtype = varflags & VSTYPE;
6603 int discard = subtype == VSPLUS || subtype == VSLENGTH;
6604 int quotes = (discard ? 0 : (flags & QUOTES_ESC)) | QUOTES_KEEPNUL;
6607 sep = (flags & EXP_FULL) << CHAR_BIT;
6608 syntax = quoted ? DQSYNTAX : BASESYNTAX;
6618 num = shellparam.nparam;
6626 goto check_1char_name;
6628 expdest = makestrspace(NOPTS, expdest);
6629 for (i = NOPTS - 1; i >= 0; i--) {
6631 USTPUTC(optletters(i), expdest);
6637 /* handles cases similar to ${#$1} */
6638 if (name[2] != '\0')
6639 raise_error_syntax("bad substitution");
6652 sep |= ifsset() ? ifsval()[0] : ' ';
6659 while ((p = *ap++) != NULL) {
6660 len += strtodest(p, syntax, quotes);
6664 memtodest(&sepc, 1, syntax, quotes);
6679 num = atoi(name); /* number(name) fails on ${N#str} etc */
6680 if (num < 0 || num > shellparam.nparam)
6682 p = num ? shellparam.p[num - 1] : arg0;
6685 /* NB: name has form "VAR=..." */
6687 /* "A=a B=$A" case: var_str_list is a list of "A=a" strings
6688 * which should be considered before we check variables. */
6690 unsigned name_len = (strchrnul(name, '=') - name) + 1;
6694 str = var_str_list->text;
6695 eq = strchr(str, '=');
6696 if (!eq) /* stop at first non-assignment */
6699 if (name_len == (unsigned)(eq - str)
6700 && strncmp(str, name, name_len) == 0
6703 /* goto value; - WRONG! */
6704 /* think "A=1 A=2 B=$A" */
6706 var_str_list = var_str_list->next;
6707 } while (var_str_list);
6711 p = lookupvar(name);
6716 len = strtodest(p, syntax, quotes);
6717 #if ENABLE_UNICODE_SUPPORT
6718 if (subtype == VSLENGTH && len > 0) {
6719 reinit_unicode_for_ash();
6720 if (unicode_status == UNICODE_ON) {
6721 STADJUST(-len, expdest);
6723 len = unicode_strlen(p);
6731 STADJUST(-len, expdest);
6736 * Expand a variable, and return a pointer to the next character in the
6740 evalvar(char *p, int flag, struct strlist *var_str_list)
6751 varflags = (unsigned char) *p++;
6752 subtype = varflags & VSTYPE;
6755 raise_error_syntax("bad substitution");
6757 quoted = flag & EXP_QUOTED;
6759 easy = (!quoted || (*var == '@' && shellparam.nparam));
6760 startloc = expdest - (char *)stackblock();
6761 p = strchr(p, '=') + 1; //TODO: use var_end(p)?
6764 varlen = varvalue(var, varflags, flag, var_str_list, "ed);
6765 if (varflags & VSNUL)
6768 if (subtype == VSPLUS) {
6769 varlen = -1 - varlen;
6773 if (subtype == VSMINUS) {
6778 flag | EXP_TILDE | EXP_WORD,
6786 if (subtype == VSASSIGN || subtype == VSQUESTION) {
6790 subevalvar(p, var, 0, subtype, startloc, varflags,
6791 flag & ~QUOTES_ESC, var_str_list);
6794 * Remove any recorded regions beyond
6797 removerecordregions(startloc);
6801 if (varlen < 0 && uflag)
6802 varunset(p, var, 0, 0);
6804 if (subtype == VSLENGTH) {
6805 cvtnum(varlen > 0 ? varlen : 0);
6809 if (subtype == VSNORMAL) {
6813 recordregion(startloc, expdest - (char *)stackblock(), quoted);
6822 case VSTRIMRIGHTMAX:
6823 #if ENABLE_ASH_BASH_COMPAT
6836 * Terminate the string and start recording the pattern
6839 STPUTC('\0', expdest);
6840 patloc = expdest - (char *)stackblock();
6841 if (NULL == subevalvar(p, /* varname: */ NULL, patloc, subtype,
6842 startloc, varflags, flag, var_str_list)) {
6843 int amount = expdest - (
6844 (char *)stackblock() + patloc - 1
6846 STADJUST(-amount, expdest);
6848 /* Remove any recorded regions beyond start of variable */
6849 removerecordregions(startloc);
6854 if (subtype != VSNORMAL) { /* skip to end of alternative */
6857 unsigned char c = *p++;
6860 else if (c == CTLBACKQ) {
6862 argbackq = argbackq->next;
6863 } else if (c == CTLVAR) {
6864 if ((*p++ & VSTYPE) != VSNORMAL)
6866 } else if (c == CTLENDVAR) {
6876 * Break the argument string into pieces based upon IFS and add the
6877 * strings to the argument list. The regions of the string to be
6878 * searched for IFS characters have been stored by recordregion.
6881 ifsbreakup(char *string, struct arglist *arglist)
6883 struct ifsregion *ifsp;
6888 const char *ifs, *realifs;
6893 if (ifslastp != NULL) {
6896 realifs = ifsset() ? ifsval() : defifs;
6899 p = string + ifsp->begoff;
6900 nulonly = ifsp->nulonly;
6901 ifs = nulonly ? nullstr : realifs;
6903 while (p < string + ifsp->endoff) {
6905 if ((unsigned char)*p == CTLESC)
6907 if (!strchr(ifs, *p)) {
6912 ifsspc = (strchr(defifs, *p) != NULL);
6913 /* Ignore IFS whitespace at start */
6914 if (q == start && ifsspc) {
6920 sp = stzalloc(sizeof(*sp));
6922 *arglist->lastp = sp;
6923 arglist->lastp = &sp->next;
6927 if (p >= string + ifsp->endoff) {
6931 if ((unsigned char)*p == CTLESC)
6933 if (strchr(ifs, *p) == NULL) {
6937 if (strchr(defifs, *p) == NULL) {
6952 } while (ifsp != NULL);
6961 sp = stzalloc(sizeof(*sp));
6963 *arglist->lastp = sp;
6964 arglist->lastp = &sp->next;
6970 struct ifsregion *p;
6975 struct ifsregion *ifsp;
6981 ifsfirst.next = NULL;
6986 * Add a file name to the list.
6989 addfname(const char *name)
6993 sp = stzalloc(sizeof(*sp));
6994 sp->text = sstrdup(name);
6996 exparg.lastp = &sp->next;
6999 /* If we want to use glob() from libc... */
7000 #if !ENABLE_ASH_INTERNAL_GLOB
7002 /* Add the result of glob() to the list */
7004 addglob(const glob_t *pglob)
7006 char **p = pglob->gl_pathv;
7013 expandmeta(struct strlist *str /*, int flag*/)
7015 /* TODO - EXP_REDIR */
7025 p = preglob(str->text, RMESCAPE_ALLOC | RMESCAPE_HEAP);
7026 // GLOB_NOMAGIC (GNU): if no *?[ chars in pattern, return it even if no match
7027 // GLOB_NOCHECK: if no match, return unchanged pattern (sans \* escapes?)
7029 // glibc 2.24.90 glob(GLOB_NOMAGIC) does not remove backslashes used for escaping:
7030 // if you pass it "file\?", it returns "file\?", not "file?", if no match.
7031 // Which means you need to unescape the string, right? Not so fast:
7032 // if there _is_ a file named "file\?" (with backslash), it is returned
7033 // as "file\?" too (whichever pattern you used to find it, say, "file*").
7034 // You DONT KNOW by looking at the result whether you need to unescape it.
7036 // Worse, globbing of "file\?" in a directory with two files, "file?" and "file\?",
7037 // returns "file\?" - which is WRONG: "file\?" pattern matches "file?" file.
7038 // Without GLOB_NOMAGIC, this works correctly ("file?" is returned as a match).
7039 // With GLOB_NOMAGIC | GLOB_NOCHECK, this also works correctly.
7040 // i = glob(p, GLOB_NOMAGIC | GLOB_NOCHECK, NULL, &pglob);
7041 // i = glob(p, GLOB_NOMAGIC, NULL, &pglob);
7042 i = glob(p, 0, NULL, &pglob);
7043 //bb_error_msg("glob('%s'):%d '%s'...", p, i, pglob.gl_pathv ? pglob.gl_pathv[0] : "-");
7048 #if 0 // glibc 2.24.90 bug? Patterns like "*/file", when match, don't set GLOB_MAGCHAR
7049 /* GLOB_MAGCHAR is set if *?[ chars were seen (GNU) */
7050 if (!(pglob.gl_flags & GLOB_MAGCHAR))
7062 *exparg.lastp = str;
7063 rmescapes(str->text, 0);
7064 exparg.lastp = &str->next;
7066 default: /* GLOB_NOSPACE */
7069 ash_msg_and_raise_error(bb_msg_memory_exhausted);
7076 /* ENABLE_ASH_INTERNAL_GLOB: Homegrown globbing code. (dash also has both, uses homegrown one.) */
7079 * Do metacharacter (i.e. *, ?, [...]) expansion.
7082 expmeta(char *expdir, char *enddir, char *name)
7098 for (p = name; esc = 0, *p; p += esc + 1) {
7099 if (*p == '*' || *p == '?')
7101 else if (*p == '[') {
7108 if (*q == '/' || *q == '\0')
7118 if (p[esc] == '/') {
7121 start = p + esc + 1;
7125 if (metaflag == 0) { /* we've reached the end of the file name */
7126 if (enddir != expdir)
7134 if (metaflag == 0 || lstat(expdir, &statb) >= 0)
7145 } while (p < start);
7147 if (enddir == expdir) {
7149 } else if (enddir == expdir + 1 && *expdir == '/') {
7158 if (enddir != expdir)
7160 if (*endname == 0) {
7173 while (!pending_int && (dp = readdir(dirp)) != NULL) {
7174 if (dp->d_name[0] == '.' && !matchdot)
7176 if (pmatch(start, dp->d_name)) {
7178 strcpy(enddir, dp->d_name);
7181 for (p = enddir, cp = dp->d_name; (*p++ = *cp++) != '\0';)
7184 expmeta(expdir, p, endname);
7190 endname[-esc - 1] = esc ? '\\' : '/';
7193 static struct strlist *
7194 msort(struct strlist *list, int len)
7196 struct strlist *p, *q = NULL;
7197 struct strlist **lpp;
7205 for (n = half; --n >= 0;) {
7209 q->next = NULL; /* terminate first half of list */
7210 q = msort(list, half); /* sort first half of list */
7211 p = msort(p, len - half); /* sort second half */
7214 #if ENABLE_LOCALE_SUPPORT
7215 if (strcoll(p->text, q->text) < 0)
7217 if (strcmp(p->text, q->text) < 0)
7241 * Sort the results of file name expansion. It calculates the number of
7242 * strings to sort and then calls msort (short for merge sort) to do the
7245 static struct strlist *
7246 expsort(struct strlist *str)
7252 for (sp = str; sp; sp = sp->next)
7254 return msort(str, len);
7258 expandmeta(struct strlist *str /*, int flag*/)
7260 static const char metachars[] ALIGN1 = {
7263 /* TODO - EXP_REDIR */
7267 struct strlist **savelastp;
7273 if (!strpbrk(str->text, metachars))
7275 savelastp = exparg.lastp;
7278 p = preglob(str->text, RMESCAPE_ALLOC | RMESCAPE_HEAP);
7280 int i = strlen(str->text);
7281 //BUGGY estimation of how long expanded name can be
7282 expdir = ckmalloc(i < 2048 ? 2048 : i+1);
7284 expmeta(expdir, expdir, p);
7289 if (exparg.lastp == savelastp) {
7294 *exparg.lastp = str;
7295 rmescapes(str->text, 0);
7296 exparg.lastp = &str->next;
7298 *exparg.lastp = NULL;
7299 *savelastp = sp = expsort(*savelastp);
7300 while (sp->next != NULL)
7302 exparg.lastp = &sp->next;
7307 #endif /* ENABLE_ASH_INTERNAL_GLOB */
7310 * Perform variable substitution and command substitution on an argument,
7311 * placing the resulting list of arguments in arglist. If EXP_FULL is true,
7312 * perform splitting and file name expansion. When arglist is NULL, perform
7313 * here document expansion.
7316 expandarg(union node *arg, struct arglist *arglist, int flag)
7321 argbackq = arg->narg.backquote;
7322 STARTSTACKSTR(expdest);
7323 ifsfirst.next = NULL;
7325 TRACE(("expandarg: argstr('%s',flags:%x)\n", arg->narg.text, flag));
7326 argstr(arg->narg.text, flag,
7327 /* var_str_list: */ arglist ? arglist->list : NULL);
7328 p = _STPUTC('\0', expdest);
7330 if (arglist == NULL) {
7331 return; /* here document expanded */
7333 p = grabstackstr(p);
7334 TRACE(("expandarg: p:'%s'\n", p));
7335 exparg.lastp = &exparg.list;
7339 if (flag & EXP_FULL) {
7340 ifsbreakup(p, &exparg);
7341 *exparg.lastp = NULL;
7342 exparg.lastp = &exparg.list;
7343 expandmeta(exparg.list /*, flag*/);
7345 if (flag & EXP_REDIR) { /*XXX - for now, just remove escapes */
7347 TRACE(("expandarg: rmescapes:'%s'\n", p));
7349 sp = stzalloc(sizeof(*sp));
7352 exparg.lastp = &sp->next;
7356 *exparg.lastp = NULL;
7358 *arglist->lastp = exparg.list;
7359 arglist->lastp = exparg.lastp;
7364 * Expand shell variables and backquotes inside a here document.
7367 expandhere(union node *arg, int fd)
7369 expandarg(arg, (struct arglist *)NULL, EXP_QUOTED);
7370 full_write(fd, stackblock(), expdest - (char *)stackblock());
7374 * Returns true if the pattern matches the string.
7377 patmatch(char *pattern, const char *string)
7379 return pmatch(preglob(pattern, 0), string);
7383 * See if a pattern matches in a case statement.
7386 casematch(union node *pattern, char *val)
7388 struct stackmark smark;
7391 setstackmark(&smark);
7392 argbackq = pattern->narg.backquote;
7393 STARTSTACKSTR(expdest);
7395 argstr(pattern->narg.text, EXP_TILDE | EXP_CASE,
7396 /* var_str_list: */ NULL);
7397 STACKSTRNUL(expdest);
7398 result = patmatch(stackblock(), val);
7399 popstackmark(&smark);
7404 /* ============ find_command */
7408 int (*builtin)(int, char **) FAST_FUNC;
7409 /* unsigned flags; */
7411 #define IS_BUILTIN_SPECIAL(b) ((b)->name[0] & 1)
7412 /* "regular" builtins always take precedence over commands,
7413 * regardless of PATH=....%builtin... position */
7414 #define IS_BUILTIN_REGULAR(b) ((b)->name[0] & 2)
7415 #define IS_BUILTIN_ASSIGN(b) ((b)->name[0] & 4)
7418 smallint cmdtype; /* CMDxxx */
7421 /* index >= 0 for commands without path (slashes) */
7422 /* (TODO: what exactly does the value mean? PATH position?) */
7423 /* index == -1 for commands with slashes */
7424 /* index == (-2 - applet_no) for NOFORK applets */
7425 const struct builtincmd *cmd;
7426 struct funcnode *func;
7429 /* values of cmdtype */
7430 #define CMDUNKNOWN -1 /* no entry in table for command */
7431 #define CMDNORMAL 0 /* command is an executable program */
7432 #define CMDFUNCTION 1 /* command is a shell function */
7433 #define CMDBUILTIN 2 /* command is a shell builtin */
7435 /* action to find_command() */
7436 #define DO_ERR 0x01 /* prints errors */
7437 #define DO_ABS 0x02 /* checks absolute paths */
7438 #define DO_NOFUNC 0x04 /* don't return shell functions, for command */
7439 #define DO_ALTPATH 0x08 /* using alternate path */
7440 #define DO_ALTBLTIN 0x20 /* %builtin in alt. path */
7442 static void find_command(char *, struct cmdentry *, int, const char *);
7445 /* ============ Hashing commands */
7448 * When commands are first encountered, they are entered in a hash table.
7449 * This ensures that a full path search will not have to be done for them
7450 * on each invocation.
7452 * We should investigate converting to a linear search, even though that
7453 * would make the command name "hash" a misnomer.
7457 struct tblentry *next; /* next entry in hash chain */
7458 union param param; /* definition of builtin function */
7459 smallint cmdtype; /* CMDxxx */
7460 char rehash; /* if set, cd done since entry created */
7461 char cmdname[1]; /* name of command */
7464 static struct tblentry **cmdtable;
7465 #define INIT_G_cmdtable() do { \
7466 cmdtable = xzalloc(CMDTABLESIZE * sizeof(cmdtable[0])); \
7469 static int builtinloc = -1; /* index in path of %builtin, or -1 */
7473 tryexec(IF_FEATURE_SH_STANDALONE(int applet_no,) char *cmd, char **argv, char **envp)
7475 #if ENABLE_FEATURE_SH_STANDALONE
7476 if (applet_no >= 0) {
7477 if (APPLET_IS_NOEXEC(applet_no)) {
7481 run_applet_no_and_exit(applet_no, argv);
7483 /* re-exec ourselves with the new arguments */
7484 execve(bb_busybox_exec_path, argv, envp);
7485 /* If they called chroot or otherwise made the binary no longer
7486 * executable, fall through */
7493 execve(cmd, argv, envp);
7494 } while (errno == EINTR);
7496 execve(cmd, argv, envp);
7498 if (cmd == (char*) bb_busybox_exec_path) {
7499 /* We already visited ENOEXEC branch below, don't do it again */
7500 //TODO: try execve(initial_argv0_of_shell, argv, envp) before giving up?
7504 if (errno == ENOEXEC) {
7505 /* Run "cmd" as a shell script:
7506 * http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html
7507 * "If the execve() function fails with ENOEXEC, the shell
7508 * shall execute a command equivalent to having a shell invoked
7509 * with the command name as its first operand,
7510 * with any remaining arguments passed to the new shell"
7512 * That is, do not use $SHELL, user's shell, or /bin/sh;
7513 * just call ourselves.
7515 * Note that bash reads ~80 chars of the file, and if it sees
7516 * a zero byte before it sees newline, it doesn't try to
7517 * interpret it, but fails with "cannot execute binary file"
7518 * message and exit code 126. For one, this prevents attempts
7519 * to interpret foreign ELF binaries as shell scripts.
7524 for (ap = argv; *ap; ap++)
7526 new = ckmalloc((ap - argv + 2) * sizeof(new[0]));
7527 new[0] = (char*) "ash";
7530 while ((*ap++ = *++argv) != NULL)
7532 cmd = (char*) bb_busybox_exec_path;
7539 * Exec a program. Never returns. If you change this routine, you may
7540 * have to change the find_command routine as well.
7542 static void shellexec(char **, const char *, int) NORETURN;
7544 shellexec(char **argv, const char *path, int idx)
7550 int applet_no = -1; /* used only by FEATURE_SH_STANDALONE */
7552 envp = listvars(VEXPORT, VUNSET, /*end:*/ NULL);
7553 if (strchr(argv[0], '/') != NULL
7554 #if ENABLE_FEATURE_SH_STANDALONE
7555 || (applet_no = find_applet_by_name(argv[0])) >= 0
7558 tryexec(IF_FEATURE_SH_STANDALONE(applet_no,) argv[0], argv, envp);
7559 if (applet_no >= 0) {
7560 /* We tried execing ourself, but it didn't work.
7561 * Maybe /proc/self/exe doesn't exist?
7570 while ((cmdname = path_advance(&path, argv[0])) != NULL) {
7571 if (--idx < 0 && pathopt == NULL) {
7572 tryexec(IF_FEATURE_SH_STANDALONE(-1,) cmdname, argv, envp);
7573 if (errno != ENOENT && errno != ENOTDIR)
7580 /* Map to POSIX errors */
7592 exitstatus = exerrno;
7593 TRACE(("shellexec failed for %s, errno %d, suppress_int %d\n",
7594 argv[0], e, suppress_int));
7595 ash_msg_and_raise(EXEXIT, "%s: %s", argv[0], errmsg(e, "not found"));
7600 printentry(struct tblentry *cmdp)
7606 idx = cmdp->param.index;
7609 name = path_advance(&path, cmdp->cmdname);
7611 } while (--idx >= 0);
7612 out1fmt("%s%s\n", name, (cmdp->rehash ? "*" : nullstr));
7616 * Clear out command entries. The argument specifies the first entry in
7617 * PATH which has changed.
7620 clearcmdentry(int firstchange)
7622 struct tblentry **tblp;
7623 struct tblentry **pp;
7624 struct tblentry *cmdp;
7627 for (tblp = cmdtable; tblp < &cmdtable[CMDTABLESIZE]; tblp++) {
7629 while ((cmdp = *pp) != NULL) {
7630 if ((cmdp->cmdtype == CMDNORMAL &&
7631 cmdp->param.index >= firstchange)
7632 || (cmdp->cmdtype == CMDBUILTIN &&
7633 builtinloc >= firstchange)
7646 * Locate a command in the command hash table. If "add" is nonzero,
7647 * add the command to the table if it is not already present. The
7648 * variable "lastcmdentry" is set to point to the address of the link
7649 * pointing to the entry, so that delete_cmd_entry can delete the
7652 * Interrupts must be off if called with add != 0.
7654 static struct tblentry **lastcmdentry;
7656 static struct tblentry *
7657 cmdlookup(const char *name, int add)
7659 unsigned int hashval;
7661 struct tblentry *cmdp;
7662 struct tblentry **pp;
7665 hashval = (unsigned char)*p << 4;
7667 hashval += (unsigned char)*p++;
7669 pp = &cmdtable[hashval % CMDTABLESIZE];
7670 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7671 if (strcmp(cmdp->cmdname, name) == 0)
7675 if (add && cmdp == NULL) {
7676 cmdp = *pp = ckzalloc(sizeof(struct tblentry)
7678 /* + 1 - already done because
7679 * tblentry::cmdname is char[1] */);
7680 /*cmdp->next = NULL; - ckzalloc did it */
7681 cmdp->cmdtype = CMDUNKNOWN;
7682 strcpy(cmdp->cmdname, name);
7689 * Delete the command entry returned on the last lookup.
7692 delete_cmd_entry(void)
7694 struct tblentry *cmdp;
7697 cmdp = *lastcmdentry;
7698 *lastcmdentry = cmdp->next;
7699 if (cmdp->cmdtype == CMDFUNCTION)
7700 freefunc(cmdp->param.func);
7706 * Add a new command entry, replacing any existing command entry for
7707 * the same name - except special builtins.
7710 addcmdentry(char *name, struct cmdentry *entry)
7712 struct tblentry *cmdp;
7714 cmdp = cmdlookup(name, 1);
7715 if (cmdp->cmdtype == CMDFUNCTION) {
7716 freefunc(cmdp->param.func);
7718 cmdp->cmdtype = entry->cmdtype;
7719 cmdp->param = entry->u;
7723 static int FAST_FUNC
7724 hashcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
7726 struct tblentry **pp;
7727 struct tblentry *cmdp;
7729 struct cmdentry entry;
7732 if (nextopt("r") != '\0') {
7737 if (*argptr == NULL) {
7738 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
7739 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7740 if (cmdp->cmdtype == CMDNORMAL)
7748 while ((name = *argptr) != NULL) {
7749 cmdp = cmdlookup(name, 0);
7751 && (cmdp->cmdtype == CMDNORMAL
7752 || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))
7756 find_command(name, &entry, DO_ERR, pathval());
7757 if (entry.cmdtype == CMDUNKNOWN)
7765 * Called when a cd is done. Marks all commands so the next time they
7766 * are executed they will be rehashed.
7771 struct tblentry **pp;
7772 struct tblentry *cmdp;
7774 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
7775 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7776 if (cmdp->cmdtype == CMDNORMAL
7777 || (cmdp->cmdtype == CMDBUILTIN
7778 && !IS_BUILTIN_REGULAR(cmdp->param.cmd)
7788 * Fix command hash table when PATH changed.
7789 * Called before PATH is changed. The argument is the new value of PATH;
7790 * pathval() still returns the old value at this point.
7791 * Called with interrupts off.
7793 static void FAST_FUNC
7794 changepath(const char *new)
7802 firstchange = 9999; /* assume no change */
7808 if ((*old == '\0' && *new == ':')
7809 || (*old == ':' && *new == '\0')
7813 old = new; /* ignore subsequent differences */
7817 if (*new == '%' && idx_bltin < 0 && prefix(new + 1, "builtin"))
7824 if (builtinloc < 0 && idx_bltin >= 0)
7825 builtinloc = idx_bltin; /* zap builtins */
7826 if (builtinloc >= 0 && idx_bltin < 0)
7828 clearcmdentry(firstchange);
7829 builtinloc = idx_bltin;
7854 #if ENABLE_ASH_BASH_COMPAT
7865 typedef smallint token_id_t;
7867 /* Nth bit indicates if token marks the end of a list */
7870 /* 0 */ | (1u << TEOF)
7871 /* 1 */ | (0u << TNL)
7872 /* 2 */ | (0u << TREDIR)
7873 /* 3 */ | (0u << TWORD)
7874 /* 4 */ | (0u << TSEMI)
7875 /* 5 */ | (0u << TBACKGND)
7876 /* 6 */ | (0u << TAND)
7877 /* 7 */ | (0u << TOR)
7878 /* 8 */ | (0u << TPIPE)
7879 /* 9 */ | (0u << TLP)
7880 /* 10 */ | (1u << TRP)
7881 /* 11 */ | (1u << TENDCASE)
7882 /* 12 */ | (1u << TENDBQUOTE)
7883 /* 13 */ | (0u << TNOT)
7884 /* 14 */ | (0u << TCASE)
7885 /* 15 */ | (1u << TDO)
7886 /* 16 */ | (1u << TDONE)
7887 /* 17 */ | (1u << TELIF)
7888 /* 18 */ | (1u << TELSE)
7889 /* 19 */ | (1u << TESAC)
7890 /* 20 */ | (1u << TFI)
7891 /* 21 */ | (0u << TFOR)
7892 #if ENABLE_ASH_BASH_COMPAT
7893 /* 22 */ | (0u << TFUNCTION)
7895 /* 23 */ | (0u << TIF)
7896 /* 24 */ | (0u << TIN)
7897 /* 25 */ | (1u << TTHEN)
7898 /* 26 */ | (0u << TUNTIL)
7899 /* 27 */ | (0u << TWHILE)
7900 /* 28 */ | (0u << TBEGIN)
7901 /* 29 */ | (1u << TEND)
7902 , /* thus far 29 bits used */
7905 static const char *const tokname_array[] = {
7919 #define KWDOFFSET 13
7920 /* the following are keywords */
7930 #if ENABLE_ASH_BASH_COMPAT
7942 /* Wrapper around strcmp for qsort/bsearch/... */
7944 pstrcmp(const void *a, const void *b)
7946 return strcmp((char*)a, *(char**)b);
7949 static const char *const *
7950 findkwd(const char *s)
7952 return bsearch(s, tokname_array + KWDOFFSET,
7953 ARRAY_SIZE(tokname_array) - KWDOFFSET,
7954 sizeof(tokname_array[0]), pstrcmp);
7958 * Locate and print what a word is...
7961 describe_command(char *command, const char *path, int describe_command_verbose)
7963 struct cmdentry entry;
7964 struct tblentry *cmdp;
7965 #if ENABLE_ASH_ALIAS
7966 const struct alias *ap;
7969 path = path ? path : pathval();
7971 if (describe_command_verbose) {
7975 /* First look at the keywords */
7976 if (findkwd(command)) {
7977 out1str(describe_command_verbose ? " is a shell keyword" : command);
7981 #if ENABLE_ASH_ALIAS
7982 /* Then look at the aliases */
7983 ap = lookupalias(command, 0);
7985 if (!describe_command_verbose) {
7990 out1fmt(" is an alias for %s", ap->val);
7994 /* Then check if it is a tracked alias */
7995 cmdp = cmdlookup(command, 0);
7997 entry.cmdtype = cmdp->cmdtype;
7998 entry.u = cmdp->param;
8000 /* Finally use brute force */
8001 find_command(command, &entry, DO_ABS, path);
8004 switch (entry.cmdtype) {
8006 int j = entry.u.index;
8012 p = path_advance(&path, command);
8016 if (describe_command_verbose) {
8018 (cmdp ? " a tracked alias for" : nullstr), p
8027 if (describe_command_verbose) {
8028 out1str(" is a shell function");
8035 if (describe_command_verbose) {
8036 out1fmt(" is a %sshell builtin",
8037 IS_BUILTIN_SPECIAL(entry.u.cmd) ?
8038 "special " : nullstr
8046 if (describe_command_verbose) {
8047 out1str(": not found\n");
8056 static int FAST_FUNC
8057 typecmd(int argc UNUSED_PARAM, char **argv)
8063 /* type -p ... ? (we don't bother checking for 'p') */
8064 if (argv[1] && argv[1][0] == '-') {
8069 err |= describe_command(argv[i++], NULL, verbose);
8074 #if ENABLE_ASH_CMDCMD
8075 /* Is it "command [-p] PROG ARGS" bltin, no other opts? Return ptr to "PROG" if yes */
8077 parse_command_args(char **argv, const char **path)
8090 if (c == '-' && !*cp) {
8098 *path = bb_default_path;
8101 /* run 'typecmd' for other options */
8110 static int FAST_FUNC
8111 commandcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
8119 const char *path = NULL;
8121 /* "command [-p] PROG ARGS" (that is, without -V or -v)
8122 * never reaches this function.
8125 while ((c = nextopt("pvV")) != '\0')
8127 verify |= VERIFY_VERBOSE;
8129 /*verify |= VERIFY_BRIEF*/;
8135 path = bb_default_path;
8137 /* Mimic bash: just "command -v" doesn't complain, it's a nop */
8139 if (/*verify && */ cmd)
8140 return describe_command(cmd, path, verify /* - VERIFY_BRIEF*/);
8147 /*static int funcblocksize; // size of structures in function */
8148 /*static int funcstringsize; // size of strings in node */
8149 static void *funcblock; /* block to allocate function from */
8150 static char *funcstring_end; /* end of block to allocate strings from */
8152 /* flags in argument to evaltree */
8153 #define EV_EXIT 01 /* exit after evaluating tree */
8154 #define EV_TESTED 02 /* exit status is checked; ignore -e flag */
8156 static const uint8_t nodesize[N_NUMBER] ALIGN1 = {
8157 [NCMD ] = SHELL_ALIGN(sizeof(struct ncmd)),
8158 [NPIPE ] = SHELL_ALIGN(sizeof(struct npipe)),
8159 [NREDIR ] = SHELL_ALIGN(sizeof(struct nredir)),
8160 [NBACKGND ] = SHELL_ALIGN(sizeof(struct nredir)),
8161 [NSUBSHELL] = SHELL_ALIGN(sizeof(struct nredir)),
8162 [NAND ] = SHELL_ALIGN(sizeof(struct nbinary)),
8163 [NOR ] = SHELL_ALIGN(sizeof(struct nbinary)),
8164 [NSEMI ] = SHELL_ALIGN(sizeof(struct nbinary)),
8165 [NIF ] = SHELL_ALIGN(sizeof(struct nif)),
8166 [NWHILE ] = SHELL_ALIGN(sizeof(struct nbinary)),
8167 [NUNTIL ] = SHELL_ALIGN(sizeof(struct nbinary)),
8168 [NFOR ] = SHELL_ALIGN(sizeof(struct nfor)),
8169 [NCASE ] = SHELL_ALIGN(sizeof(struct ncase)),
8170 [NCLIST ] = SHELL_ALIGN(sizeof(struct nclist)),
8171 [NDEFUN ] = SHELL_ALIGN(sizeof(struct narg)),
8172 [NARG ] = SHELL_ALIGN(sizeof(struct narg)),
8173 [NTO ] = SHELL_ALIGN(sizeof(struct nfile)),
8174 #if ENABLE_ASH_BASH_COMPAT
8175 [NTO2 ] = SHELL_ALIGN(sizeof(struct nfile)),
8177 [NCLOBBER ] = SHELL_ALIGN(sizeof(struct nfile)),
8178 [NFROM ] = SHELL_ALIGN(sizeof(struct nfile)),
8179 [NFROMTO ] = SHELL_ALIGN(sizeof(struct nfile)),
8180 [NAPPEND ] = SHELL_ALIGN(sizeof(struct nfile)),
8181 [NTOFD ] = SHELL_ALIGN(sizeof(struct ndup)),
8182 [NFROMFD ] = SHELL_ALIGN(sizeof(struct ndup)),
8183 [NHERE ] = SHELL_ALIGN(sizeof(struct nhere)),
8184 [NXHERE ] = SHELL_ALIGN(sizeof(struct nhere)),
8185 [NNOT ] = SHELL_ALIGN(sizeof(struct nnot)),
8188 static int calcsize(int funcblocksize, union node *n);
8191 sizenodelist(int funcblocksize, struct nodelist *lp)
8194 funcblocksize += SHELL_ALIGN(sizeof(struct nodelist));
8195 funcblocksize = calcsize(funcblocksize, lp->n);
8198 return funcblocksize;
8202 calcsize(int funcblocksize, union node *n)
8205 return funcblocksize;
8206 funcblocksize += nodesize[n->type];
8209 funcblocksize = calcsize(funcblocksize, n->ncmd.redirect);
8210 funcblocksize = calcsize(funcblocksize, n->ncmd.args);
8211 funcblocksize = calcsize(funcblocksize, n->ncmd.assign);
8214 funcblocksize = sizenodelist(funcblocksize, n->npipe.cmdlist);
8219 funcblocksize = calcsize(funcblocksize, n->nredir.redirect);
8220 funcblocksize = calcsize(funcblocksize, n->nredir.n);
8227 funcblocksize = calcsize(funcblocksize, n->nbinary.ch2);
8228 funcblocksize = calcsize(funcblocksize, n->nbinary.ch1);
8231 funcblocksize = calcsize(funcblocksize, n->nif.elsepart);
8232 funcblocksize = calcsize(funcblocksize, n->nif.ifpart);
8233 funcblocksize = calcsize(funcblocksize, n->nif.test);
8236 funcblocksize += SHELL_ALIGN(strlen(n->nfor.var) + 1); /* was funcstringsize += ... */
8237 funcblocksize = calcsize(funcblocksize, n->nfor.body);
8238 funcblocksize = calcsize(funcblocksize, n->nfor.args);
8241 funcblocksize = calcsize(funcblocksize, n->ncase.cases);
8242 funcblocksize = calcsize(funcblocksize, n->ncase.expr);
8245 funcblocksize = calcsize(funcblocksize, n->nclist.body);
8246 funcblocksize = calcsize(funcblocksize, n->nclist.pattern);
8247 funcblocksize = calcsize(funcblocksize, n->nclist.next);
8251 funcblocksize = sizenodelist(funcblocksize, n->narg.backquote);
8252 funcblocksize += SHELL_ALIGN(strlen(n->narg.text) + 1); /* was funcstringsize += ... */
8253 funcblocksize = calcsize(funcblocksize, n->narg.next);
8256 #if ENABLE_ASH_BASH_COMPAT
8263 funcblocksize = calcsize(funcblocksize, n->nfile.fname);
8264 funcblocksize = calcsize(funcblocksize, n->nfile.next);
8268 funcblocksize = calcsize(funcblocksize, n->ndup.vname);
8269 funcblocksize = calcsize(funcblocksize, n->ndup.next);
8273 funcblocksize = calcsize(funcblocksize, n->nhere.doc);
8274 funcblocksize = calcsize(funcblocksize, n->nhere.next);
8277 funcblocksize = calcsize(funcblocksize, n->nnot.com);
8280 return funcblocksize;
8284 nodeckstrdup(char *s)
8286 funcstring_end -= SHELL_ALIGN(strlen(s) + 1);
8287 return strcpy(funcstring_end, s);
8290 static union node *copynode(union node *);
8292 static struct nodelist *
8293 copynodelist(struct nodelist *lp)
8295 struct nodelist *start;
8296 struct nodelist **lpp;
8301 funcblock = (char *) funcblock + SHELL_ALIGN(sizeof(struct nodelist));
8302 (*lpp)->n = copynode(lp->n);
8304 lpp = &(*lpp)->next;
8311 copynode(union node *n)
8318 funcblock = (char *) funcblock + nodesize[n->type];
8322 new->ncmd.redirect = copynode(n->ncmd.redirect);
8323 new->ncmd.args = copynode(n->ncmd.args);
8324 new->ncmd.assign = copynode(n->ncmd.assign);
8327 new->npipe.cmdlist = copynodelist(n->npipe.cmdlist);
8328 new->npipe.pipe_backgnd = n->npipe.pipe_backgnd;
8333 new->nredir.redirect = copynode(n->nredir.redirect);
8334 new->nredir.n = copynode(n->nredir.n);
8341 new->nbinary.ch2 = copynode(n->nbinary.ch2);
8342 new->nbinary.ch1 = copynode(n->nbinary.ch1);
8345 new->nif.elsepart = copynode(n->nif.elsepart);
8346 new->nif.ifpart = copynode(n->nif.ifpart);
8347 new->nif.test = copynode(n->nif.test);
8350 new->nfor.var = nodeckstrdup(n->nfor.var);
8351 new->nfor.body = copynode(n->nfor.body);
8352 new->nfor.args = copynode(n->nfor.args);
8355 new->ncase.cases = copynode(n->ncase.cases);
8356 new->ncase.expr = copynode(n->ncase.expr);
8359 new->nclist.body = copynode(n->nclist.body);
8360 new->nclist.pattern = copynode(n->nclist.pattern);
8361 new->nclist.next = copynode(n->nclist.next);
8365 new->narg.backquote = copynodelist(n->narg.backquote);
8366 new->narg.text = nodeckstrdup(n->narg.text);
8367 new->narg.next = copynode(n->narg.next);
8370 #if ENABLE_ASH_BASH_COMPAT
8377 new->nfile.fname = copynode(n->nfile.fname);
8378 new->nfile.fd = n->nfile.fd;
8379 new->nfile.next = copynode(n->nfile.next);
8383 new->ndup.vname = copynode(n->ndup.vname);
8384 new->ndup.dupfd = n->ndup.dupfd;
8385 new->ndup.fd = n->ndup.fd;
8386 new->ndup.next = copynode(n->ndup.next);
8390 new->nhere.doc = copynode(n->nhere.doc);
8391 new->nhere.fd = n->nhere.fd;
8392 new->nhere.next = copynode(n->nhere.next);
8395 new->nnot.com = copynode(n->nnot.com);
8398 new->type = n->type;
8403 * Make a copy of a parse tree.
8405 static struct funcnode *
8406 copyfunc(union node *n)
8411 /*funcstringsize = 0;*/
8412 blocksize = offsetof(struct funcnode, n) + calcsize(0, n);
8413 f = ckzalloc(blocksize /* + funcstringsize */);
8414 funcblock = (char *) f + offsetof(struct funcnode, n);
8415 funcstring_end = (char *) f + blocksize;
8417 /* f->count = 0; - ckzalloc did it */
8422 * Define a shell function.
8425 defun(union node *func)
8427 struct cmdentry entry;
8430 entry.cmdtype = CMDFUNCTION;
8431 entry.u.func = copyfunc(func);
8432 addcmdentry(func->narg.text, &entry);
8436 /* Reasons for skipping commands (see comment on breakcmd routine) */
8437 #define SKIPBREAK (1 << 0)
8438 #define SKIPCONT (1 << 1)
8439 #define SKIPFUNC (1 << 2)
8440 static smallint evalskip; /* set to SKIPxxx if we are skipping commands */
8441 static int skipcount; /* number of levels to skip */
8442 static int funcnest; /* depth of function calls */
8443 static int loopnest; /* current loop nesting level */
8445 /* Forward decl way out to parsing code - dotrap needs it */
8446 static int evalstring(char *s, int flags);
8448 /* Called to execute a trap.
8449 * Single callsite - at the end of evaltree().
8450 * If we return non-zero, evaltree raises EXEXIT exception.
8452 * Perhaps we should avoid entering new trap handlers
8453 * while we are executing a trap handler. [is it a TODO?]
8460 uint8_t last_status;
8465 last_status = exitstatus;
8469 TRACE(("dotrap entered\n"));
8470 for (sig = 1, g = gotsig; sig < NSIG; sig++, g++) {
8482 /* non-trapped SIGINT is handled separately by raise_interrupt,
8483 * don't upset it by resetting gotsig[SIGINT-1] */
8484 if (sig == SIGINT && !p)
8487 TRACE(("sig %d is active, will run handler '%s'\n", sig, p));
8493 exitstatus = last_status;
8494 TRACE(("dotrap returns\n"));
8497 /* forward declarations - evaluation is fairly recursive business... */
8498 static int evalloop(union node *, int);
8499 static int evalfor(union node *, int);
8500 static int evalcase(union node *, int);
8501 static int evalsubshell(union node *, int);
8502 static void expredir(union node *);
8503 static int evalpipe(union node *, int);
8504 static int evalcommand(union node *, int);
8505 static int evalbltin(const struct builtincmd *, int, char **, int);
8506 static void prehash(union node *);
8509 * Evaluate a parse tree. The value is left in the global variable
8513 evaltree(union node *n, int flags)
8515 struct jmploc *volatile savehandler = exception_handler;
8516 struct jmploc jmploc;
8518 int (*evalfn)(union node *, int);
8522 SAVE_INT(int_level);
8525 TRACE(("evaltree(NULL) called\n"));
8528 TRACE(("evaltree(%p: %d, %d) called\n", n, n->type, flags));
8532 exception_handler = &jmploc;
8534 int err = setjmp(jmploc.loc);
8536 /* if it was a signal, check for trap handlers */
8537 if (exception_type == EXSIG) {
8538 TRACE(("exception %d (EXSIG) in evaltree, err=%d\n",
8539 exception_type, err));
8542 /* continue on the way out */
8543 TRACE(("exception %d in evaltree, propagating err=%d\n",
8544 exception_type, err));
8545 exception_handler = savehandler;
8546 longjmp(exception_handler->loc, err);
8553 out1fmt("Node type = %d\n", n->type);
8558 status = !evaltree(n->nnot.com, EV_TESTED);
8561 expredir(n->nredir.redirect);
8562 status = redirectsafe(n->nredir.redirect, REDIR_PUSH);
8564 status = evaltree(n->nredir.n, flags & EV_TESTED);
8566 if (n->nredir.redirect)
8567 popredir(/*drop:*/ 0, /*restore:*/ 0 /* not sure */);
8570 evalfn = evalcommand;
8572 if (eflag && !(flags & EV_TESTED))
8584 evalfn = evalsubshell;
8597 #error NAND + 1 != NOR
8599 #if NOR + 1 != NSEMI
8600 #error NOR + 1 != NSEMI
8602 unsigned is_or = n->type - NAND;
8605 (flags | ((is_or >> 1) - 1)) & EV_TESTED
8607 if ((!status) == is_or || evalskip)
8613 status = evalfn(n, flags);
8617 status = evaltree(n->nif.test, EV_TESTED);
8624 if (n->nif.elsepart) {
8625 n = n->nif.elsepart;
8632 /* Not necessary. To test it:
8633 * "false; f() { qwerty; }; echo $?" should print 0.
8637 exitstatus = status;
8642 exception_handler = savehandler;
8645 /* Order of checks below is important:
8646 * signal handlers trigger before exit caused by "set -e".
8650 if (checkexit & status)
8651 raise_exception(EXEXIT);
8652 if (flags & EV_EXIT)
8653 raise_exception(EXEXIT);
8655 RESTORE_INT(int_level);
8656 TRACE(("leaving evaltree (no interrupts)\n"));
8661 #if !defined(__alpha__) || (defined(__GNUC__) && __GNUC__ >= 3)
8664 int evaltreenr(union node *, int) __attribute__ ((alias("evaltree"),__noreturn__));
8669 int skip = evalskip;
8676 if (--skipcount <= 0) {
8687 evalloop(union node *n, int flags)
8698 i = evaltree(n->nbinary.ch1, EV_TESTED);
8700 if (skip == SKIPFUNC)
8704 if (n->type != NWHILE)
8708 status = evaltree(n->nbinary.ch2, flags);
8710 } while (!(skip & ~SKIPCONT));
8717 evalfor(union node *n, int flags)
8719 struct arglist arglist;
8722 struct stackmark smark;
8725 setstackmark(&smark);
8726 arglist.list = NULL;
8727 arglist.lastp = &arglist.list;
8728 for (argp = n->nfor.args; argp; argp = argp->narg.next) {
8729 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
8731 *arglist.lastp = NULL;
8735 for (sp = arglist.list; sp; sp = sp->next) {
8736 setvar0(n->nfor.var, sp->text);
8737 status = evaltree(n->nfor.body, flags);
8738 if (skiploop() & ~SKIPCONT)
8742 popstackmark(&smark);
8748 evalcase(union node *n, int flags)
8752 struct arglist arglist;
8753 struct stackmark smark;
8756 setstackmark(&smark);
8757 arglist.list = NULL;
8758 arglist.lastp = &arglist.list;
8759 expandarg(n->ncase.expr, &arglist, EXP_TILDE);
8760 for (cp = n->ncase.cases; cp && evalskip == 0; cp = cp->nclist.next) {
8761 for (patp = cp->nclist.pattern; patp; patp = patp->narg.next) {
8762 if (casematch(patp, arglist.list->text)) {
8763 /* Ensure body is non-empty as otherwise
8764 * EV_EXIT may prevent us from setting the
8767 if (evalskip == 0 && cp->nclist.body) {
8768 status = evaltree(cp->nclist.body, flags);
8775 popstackmark(&smark);
8781 * Kick off a subshell to evaluate a tree.
8784 evalsubshell(union node *n, int flags)
8787 int backgnd = (n->type == NBACKGND);
8790 expredir(n->nredir.redirect);
8791 if (!backgnd && (flags & EV_EXIT) && !may_have_traps)
8794 jp = makejob(/*n,*/ 1);
8795 if (forkshell(jp, n, backgnd) == 0) {
8800 flags &= ~EV_TESTED;
8802 redirect(n->nredir.redirect, 0);
8803 evaltreenr(n->nredir.n, flags);
8808 status = waitforjob(jp);
8814 * Compute the names of the files in a redirection list.
8816 static void fixredir(union node *, const char *, int);
8818 expredir(union node *n)
8822 for (redir = n; redir; redir = redir->nfile.next) {
8826 fn.lastp = &fn.list;
8827 switch (redir->type) {
8831 #if ENABLE_ASH_BASH_COMPAT
8836 expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR);
8837 TRACE(("expredir expanded to '%s'\n", fn.list->text));
8838 #if ENABLE_ASH_BASH_COMPAT
8842 // By the design of stack allocator, the loop of this kind:
8843 // while true; do while true; do break; done </dev/null; done
8844 // will look like a memory leak: ash plans to free expfname's
8845 // of "/dev/null" as soon as it finishes running the loop
8846 // (in this case, never).
8847 // This "fix" is wrong:
8848 if (redir->nfile.expfname)
8849 stunalloc(redir->nfile.expfname);
8850 // It results in corrupted state of stacked allocations.
8852 redir->nfile.expfname = fn.list->text;
8855 case NTOFD: /* >& */
8856 if (redir->ndup.vname) {
8857 expandarg(redir->ndup.vname, &fn, EXP_FULL | EXP_TILDE);
8858 if (fn.list == NULL)
8859 ash_msg_and_raise_error("redir error");
8860 #if ENABLE_ASH_BASH_COMPAT
8861 //FIXME: we used expandarg with different args!
8862 if (!isdigit_str9(fn.list->text)) {
8863 /* >&file, not >&fd */
8864 if (redir->nfile.fd != 1) /* 123>&file - BAD */
8865 ash_msg_and_raise_error("redir error");
8867 goto store_expfname;
8870 fixredir(redir, fn.list->text, 1);
8878 * Evaluate a pipeline. All the processes in the pipeline are children
8879 * of the process creating the pipeline. (This differs from some versions
8880 * of the shell, which make the last process in a pipeline the parent
8884 evalpipe(union node *n, int flags)
8887 struct nodelist *lp;
8893 TRACE(("evalpipe(0x%lx) called\n", (long)n));
8895 for (lp = n->npipe.cmdlist; lp; lp = lp->next)
8899 jp = makejob(/*n,*/ pipelen);
8901 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
8905 if (pipe(pip) < 0) {
8907 ash_msg_and_raise_error("pipe call failed");
8910 if (forkshell(jp, lp->n, n->npipe.pipe_backgnd) == 0) {
8923 evaltreenr(lp->n, flags);
8929 /* Don't want to trigger debugging */
8933 if (n->npipe.pipe_backgnd == 0) {
8934 status = waitforjob(jp);
8935 TRACE(("evalpipe: job done exit status %d\n", status));
8943 * Controls whether the shell is interactive or not.
8946 setinteractive(int on)
8948 static smallint is_interactive;
8950 if (++on == is_interactive)
8952 is_interactive = on;
8956 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
8957 if (is_interactive > 1) {
8958 /* Looks like they want an interactive shell */
8959 static smallint did_banner;
8962 /* note: ash and hush share this string */
8963 out1fmt("\n\n%s %s\n"
8964 IF_ASH_HELP("Enter 'help' for a list of built-in commands.\n")
8967 "built-in shell (ash)"
8981 setinteractive(iflag);
8983 #if ENABLE_FEATURE_EDITING_VI
8985 line_input_state->flags |= VI_MODE;
8987 line_input_state->flags &= ~VI_MODE;
8989 viflag = 0; /* forcibly keep the option off */
8993 static struct localvar *localvars;
8996 * Called after a function returns.
8997 * Interrupts must be off.
9002 struct localvar *lvp;
9005 while ((lvp = localvars) != NULL) {
9006 localvars = lvp->next;
9008 TRACE(("poplocalvar %s\n", vp ? vp->var_text : "-"));
9009 if (vp == NULL) { /* $- saved */
9010 memcpy(optlist, lvp->text, sizeof(optlist));
9011 free((char*)lvp->text);
9013 } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) {
9014 unsetvar(vp->var_text);
9017 vp->var_func(var_end(lvp->text));
9018 if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
9019 free((char*)vp->var_text);
9020 vp->flags = lvp->flags;
9021 vp->var_text = lvp->text;
9028 evalfun(struct funcnode *func, int argc, char **argv, int flags)
9030 volatile struct shparam saveparam;
9031 struct localvar *volatile savelocalvars;
9032 struct jmploc *volatile savehandler;
9033 struct jmploc jmploc;
9036 saveparam = shellparam;
9037 savelocalvars = localvars;
9038 savehandler = exception_handler;
9039 e = setjmp(jmploc.loc);
9044 exception_handler = &jmploc;
9046 shellparam.malloced = 0;
9050 shellparam.nparam = argc - 1;
9051 shellparam.p = argv + 1;
9052 #if ENABLE_ASH_GETOPTS
9053 shellparam.optind = 1;
9054 shellparam.optoff = -1;
9056 evaltree(func->n.narg.next, flags & EV_TESTED);
9062 localvars = savelocalvars;
9063 freeparam(&shellparam);
9064 shellparam = saveparam;
9065 exception_handler = savehandler;
9067 evalskip &= ~SKIPFUNC;
9072 * Make a variable a local variable. When a variable is made local, it's
9073 * value and flags are saved in a localvar structure. The saved values
9074 * will be restored when the shell function returns. We handle the name
9075 * "-" as a special case: it makes changes to "set +-options" local
9076 * (options will be restored on return from the function).
9081 struct localvar *lvp;
9084 char *eq = strchr(name, '=');
9087 /* Cater for duplicate "local". Examples:
9088 * x=0; f() { local x=1; echo $x; local x; echo $x; }; f; echo $x
9089 * x=0; f() { local x=1; echo $x; local x=2; echo $x; }; f; echo $x
9093 if (lvp->vp && varcmp(lvp->vp->var_text, name) == 0) {
9097 * it's a duplicate "local VAR" declaration, do nothing
9104 lvp = ckzalloc(sizeof(*lvp));
9105 if (LONE_DASH(name)) {
9107 p = ckmalloc(sizeof(optlist));
9108 lvp->text = memcpy(p, optlist, sizeof(optlist));
9111 vpp = hashvar(name);
9112 vp = *findvar(vpp, name);
9114 /* variable did not exist yet */
9116 setvareq(name, VSTRFIXED);
9118 setvar(name, NULL, VSTRFIXED);
9119 vp = *vpp; /* the new variable */
9120 lvp->flags = VUNSET;
9122 lvp->text = vp->var_text;
9123 lvp->flags = vp->flags;
9124 /* make sure neither "struct var" nor string gets freed
9125 * during (un)setting:
9127 vp->flags |= VSTRFIXED|VTEXTFIXED;
9131 /* "local VAR" unsets VAR: */
9132 setvar0(name, NULL);
9136 lvp->next = localvars;
9142 * The "local" command.
9144 static int FAST_FUNC
9145 localcmd(int argc UNUSED_PARAM, char **argv)
9150 ash_msg_and_raise_error("not in a function");
9153 while ((name = *argv++) != NULL) {
9159 static int FAST_FUNC
9160 falsecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
9165 static int FAST_FUNC
9166 truecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
9171 static int FAST_FUNC
9172 execcmd(int argc UNUSED_PARAM, char **argv)
9175 iflag = 0; /* exit on error */
9178 /* We should set up signals for "exec CMD"
9179 * the same way as for "CMD" without "exec".
9180 * But optschanged->setinteractive->setsignal
9181 * still thought we are a root shell. Therefore, for example,
9182 * SIGQUIT is still set to IGN. Fix it:
9186 /*setsignal(SIGTERM); - unnecessary because of iflag=0 */
9187 /*setsignal(SIGTSTP); - unnecessary because of mflag=0 */
9188 /*setsignal(SIGTTOU); - unnecessary because of mflag=0 */
9190 shellexec(argv + 1, pathval(), 0);
9197 * The return command.
9199 static int FAST_FUNC
9200 returncmd(int argc UNUSED_PARAM, char **argv)
9203 * If called outside a function, do what ksh does;
9204 * skip the rest of the file.
9206 evalskip = SKIPFUNC;
9207 return argv[1] ? number(argv[1]) : exitstatus;
9210 /* Forward declarations for builtintab[] */
9211 static int breakcmd(int, char **) FAST_FUNC;
9212 static int dotcmd(int, char **) FAST_FUNC;
9213 static int evalcmd(int, char **, int) FAST_FUNC;
9214 static int exitcmd(int, char **) FAST_FUNC;
9215 static int exportcmd(int, char **) FAST_FUNC;
9216 #if ENABLE_ASH_GETOPTS
9217 static int getoptscmd(int, char **) FAST_FUNC;
9220 static int helpcmd(int, char **) FAST_FUNC;
9223 static int historycmd(int, char **) FAST_FUNC;
9225 #if ENABLE_SH_MATH_SUPPORT
9226 static int letcmd(int, char **) FAST_FUNC;
9228 static int readcmd(int, char **) FAST_FUNC;
9229 static int setcmd(int, char **) FAST_FUNC;
9230 static int shiftcmd(int, char **) FAST_FUNC;
9231 static int timescmd(int, char **) FAST_FUNC;
9232 static int trapcmd(int, char **) FAST_FUNC;
9233 static int umaskcmd(int, char **) FAST_FUNC;
9234 static int unsetcmd(int, char **) FAST_FUNC;
9235 static int ulimitcmd(int, char **) FAST_FUNC;
9237 #define BUILTIN_NOSPEC "0"
9238 #define BUILTIN_SPECIAL "1"
9239 #define BUILTIN_REGULAR "2"
9240 #define BUILTIN_SPEC_REG "3"
9241 #define BUILTIN_ASSIGN "4"
9242 #define BUILTIN_SPEC_ASSG "5"
9243 #define BUILTIN_REG_ASSG "6"
9244 #define BUILTIN_SPEC_REG_ASSG "7"
9246 /* Stubs for calling non-FAST_FUNC's */
9247 #if ENABLE_ASH_BUILTIN_ECHO
9248 static int FAST_FUNC echocmd(int argc, char **argv) { return echo_main(argc, argv); }
9250 #if ENABLE_ASH_BUILTIN_PRINTF
9251 static int FAST_FUNC printfcmd(int argc, char **argv) { return printf_main(argc, argv); }
9253 #if ENABLE_ASH_BUILTIN_TEST
9254 static int FAST_FUNC testcmd(int argc, char **argv) { return test_main(argc, argv); }
9257 /* Keep these in proper order since it is searched via bsearch() */
9258 static const struct builtincmd builtintab[] = {
9259 { BUILTIN_SPEC_REG "." , dotcmd },
9260 { BUILTIN_SPEC_REG ":" , truecmd },
9261 #if ENABLE_ASH_BUILTIN_TEST
9262 { BUILTIN_REGULAR "[" , testcmd },
9263 #if ENABLE_ASH_BASH_COMPAT
9264 { BUILTIN_REGULAR "[[" , testcmd },
9267 #if ENABLE_ASH_ALIAS
9268 { BUILTIN_REG_ASSG "alias" , aliascmd },
9271 { BUILTIN_REGULAR "bg" , fg_bgcmd },
9273 { BUILTIN_SPEC_REG "break" , breakcmd },
9274 { BUILTIN_REGULAR "cd" , cdcmd },
9275 { BUILTIN_NOSPEC "chdir" , cdcmd },
9276 #if ENABLE_ASH_CMDCMD
9277 { BUILTIN_REGULAR "command" , commandcmd },
9279 { BUILTIN_SPEC_REG "continue", breakcmd },
9280 #if ENABLE_ASH_BUILTIN_ECHO
9281 { BUILTIN_REGULAR "echo" , echocmd },
9283 { BUILTIN_SPEC_REG "eval" , NULL }, /*evalcmd() has a differing prototype*/
9284 { BUILTIN_SPEC_REG "exec" , execcmd },
9285 { BUILTIN_SPEC_REG "exit" , exitcmd },
9286 { BUILTIN_SPEC_REG_ASSG "export" , exportcmd },
9287 { BUILTIN_REGULAR "false" , falsecmd },
9289 { BUILTIN_REGULAR "fg" , fg_bgcmd },
9291 #if ENABLE_ASH_GETOPTS
9292 { BUILTIN_REGULAR "getopts" , getoptscmd },
9294 { BUILTIN_NOSPEC "hash" , hashcmd },
9296 { BUILTIN_NOSPEC "help" , helpcmd },
9299 { BUILTIN_NOSPEC "history" , historycmd },
9302 { BUILTIN_REGULAR "jobs" , jobscmd },
9303 { BUILTIN_REGULAR "kill" , killcmd },
9305 #if ENABLE_SH_MATH_SUPPORT
9306 { BUILTIN_NOSPEC "let" , letcmd },
9308 { BUILTIN_ASSIGN "local" , localcmd },
9309 #if ENABLE_ASH_BUILTIN_PRINTF
9310 { BUILTIN_REGULAR "printf" , printfcmd },
9312 { BUILTIN_NOSPEC "pwd" , pwdcmd },
9313 { BUILTIN_REGULAR "read" , readcmd },
9314 { BUILTIN_SPEC_REG_ASSG "readonly", exportcmd },
9315 { BUILTIN_SPEC_REG "return" , returncmd },
9316 { BUILTIN_SPEC_REG "set" , setcmd },
9317 { BUILTIN_SPEC_REG "shift" , shiftcmd },
9318 #if ENABLE_ASH_BASH_COMPAT
9319 { BUILTIN_SPEC_REG "source" , dotcmd },
9321 #if ENABLE_ASH_BUILTIN_TEST
9322 { BUILTIN_REGULAR "test" , testcmd },
9324 { BUILTIN_SPEC_REG "times" , timescmd },
9325 { BUILTIN_SPEC_REG "trap" , trapcmd },
9326 { BUILTIN_REGULAR "true" , truecmd },
9327 { BUILTIN_NOSPEC "type" , typecmd },
9328 { BUILTIN_NOSPEC "ulimit" , ulimitcmd },
9329 { BUILTIN_REGULAR "umask" , umaskcmd },
9330 #if ENABLE_ASH_ALIAS
9331 { BUILTIN_REGULAR "unalias" , unaliascmd },
9333 { BUILTIN_SPEC_REG "unset" , unsetcmd },
9334 { BUILTIN_REGULAR "wait" , waitcmd },
9337 /* Should match the above table! */
9338 #define COMMANDCMD (builtintab + \
9340 /* [ */ 1 * ENABLE_ASH_BUILTIN_TEST + \
9341 /* [[ */ 1 * ENABLE_ASH_BUILTIN_TEST * ENABLE_ASH_BASH_COMPAT + \
9342 /* alias */ 1 * ENABLE_ASH_ALIAS + \
9343 /* bg */ 1 * ENABLE_ASH_JOB_CONTROL + \
9344 /* break cd cddir */ 3)
9345 #define EVALCMD (COMMANDCMD + \
9346 /* command */ 1 * ENABLE_ASH_CMDCMD + \
9347 /* continue */ 1 + \
9348 /* echo */ 1 * ENABLE_ASH_BUILTIN_ECHO + \
9350 #define EXECCMD (EVALCMD + \
9354 * Search the table of builtin commands.
9357 pstrcmp1(const void *a, const void *b)
9359 return strcmp((char*)a, *(char**)b + 1);
9361 static struct builtincmd *
9362 find_builtin(const char *name)
9364 struct builtincmd *bp;
9367 name, builtintab, ARRAY_SIZE(builtintab), sizeof(builtintab[0]),
9374 * Execute a simple command.
9377 isassignment(const char *p)
9379 const char *q = endofname(p);
9384 static int FAST_FUNC
9385 bltincmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
9387 /* Preserve exitstatus of a previous possible redirection
9388 * as POSIX mandates */
9389 return back_exitstatus;
9392 evalcommand(union node *cmd, int flags)
9394 static const struct builtincmd null_bltin = {
9395 "\0\0", bltincmd /* why three NULs? */
9397 struct stackmark smark;
9399 struct arglist arglist;
9400 struct arglist varlist;
9403 const struct strlist *sp;
9404 struct cmdentry cmdentry;
9411 struct builtincmd *bcmd;
9412 smallint cmd_is_exec;
9413 smallint pseudovarflag = 0;
9415 /* First expand the arguments. */
9416 TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags));
9417 setstackmark(&smark);
9418 back_exitstatus = 0;
9420 cmdentry.cmdtype = CMDBUILTIN;
9421 cmdentry.u.cmd = &null_bltin;
9422 varlist.lastp = &varlist.list;
9423 *varlist.lastp = NULL;
9424 arglist.lastp = &arglist.list;
9425 *arglist.lastp = NULL;
9428 if (cmd->ncmd.args) {
9429 bcmd = find_builtin(cmd->ncmd.args->narg.text);
9430 pseudovarflag = bcmd && IS_BUILTIN_ASSIGN(bcmd);
9433 for (argp = cmd->ncmd.args; argp; argp = argp->narg.next) {
9434 struct strlist **spp;
9436 spp = arglist.lastp;
9437 if (pseudovarflag && isassignment(argp->narg.text))
9438 expandarg(argp, &arglist, EXP_VARTILDE);
9440 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
9442 for (sp = *spp; sp; sp = sp->next)
9446 argv = nargv = stalloc(sizeof(char *) * (argc + 1));
9447 for (sp = arglist.list; sp; sp = sp->next) {
9448 TRACE(("evalcommand arg: %s\n", sp->text));
9449 *nargv++ = sp->text;
9454 if (iflag && funcnest == 0 && argc > 0)
9455 lastarg = nargv[-1];
9458 expredir(cmd->ncmd.redirect);
9459 status = redirectsafe(cmd->ncmd.redirect, REDIR_PUSH | REDIR_SAVEFD2);
9461 path = vpath.var_text;
9462 for (argp = cmd->ncmd.assign; argp; argp = argp->narg.next) {
9463 struct strlist **spp;
9466 spp = varlist.lastp;
9467 expandarg(argp, &varlist, EXP_VARTILDE);
9470 * Modify the command lookup path, if a PATH= assignment
9474 if (varcmp(p, path) == 0)
9478 /* Print the command if xflag is set. */
9481 const char *p = " %s" + 1;
9483 fdprintf(preverrout_fd, p, expandstr(ps4val()));
9485 for (n = 0; n < 2; n++) {
9487 fdprintf(preverrout_fd, p, sp->text);
9493 safe_write(preverrout_fd, "\n", 1);
9499 /* Now locate the command. */
9501 int cmd_flag = DO_ERR;
9502 #if ENABLE_ASH_CMDCMD
9503 const char *oldpath = path + 5;
9507 find_command(argv[0], &cmdentry, cmd_flag, path);
9508 if (cmdentry.cmdtype == CMDUNKNOWN) {
9509 flush_stdout_stderr();
9514 /* implement bltin and command here */
9515 if (cmdentry.cmdtype != CMDBUILTIN)
9518 spclbltin = IS_BUILTIN_SPECIAL(cmdentry.u.cmd);
9519 if (cmdentry.u.cmd == EXECCMD)
9521 #if ENABLE_ASH_CMDCMD
9522 if (cmdentry.u.cmd == COMMANDCMD) {
9524 nargv = parse_command_args(argv, &path);
9527 /* It's "command [-p] PROG ARGS" (that is, no -Vv).
9528 * nargv => "PROG". path is updated if -p.
9530 argc -= nargv - argv;
9532 cmd_flag |= DO_NOFUNC;
9540 /* We have a redirection error. */
9542 raise_exception(EXERROR);
9544 exitstatus = status;
9548 /* Execute the command. */
9549 switch (cmdentry.cmdtype) {
9552 #if ENABLE_FEATURE_SH_NOFORK
9553 /* (1) BUG: if variables are set, we need to fork, or save/restore them
9554 * around run_nofork_applet() call.
9555 * (2) Should this check also be done in forkshell()?
9556 * (perhaps it should, so that "VAR=VAL nofork" at least avoids exec...)
9558 /* find_command() encodes applet_no as (-2 - applet_no) */
9559 int applet_no = (- cmdentry.u.index - 2);
9560 if (applet_no >= 0 && APPLET_IS_NOFORK(applet_no)) {
9561 listsetvar(varlist.list, VEXPORT|VSTACK);
9562 /* run <applet>_main() */
9563 status = run_nofork_applet(applet_no, argv);
9567 /* Can we avoid forking off? For example, very last command
9568 * in a script or a subshell does not need forking,
9569 * we can just exec it.
9571 if (!(flags & EV_EXIT) || may_have_traps) {
9572 /* No, forking off a child is necessary */
9574 jp = makejob(/*cmd,*/ 1);
9575 if (forkshell(jp, cmd, FORK_FG) != 0) {
9577 status = waitforjob(jp);
9579 TRACE(("forked child exited with %d\n", status));
9584 /* fall through to exec'ing external program */
9586 listsetvar(varlist.list, VEXPORT|VSTACK);
9587 shellexec(argv, path, cmdentry.u.index);
9591 cmdenviron = varlist.list;
9593 struct strlist *list = cmdenviron;
9595 if (spclbltin > 0 || argc == 0) {
9597 if (cmd_is_exec && argc > 1)
9600 listsetvar(list, i);
9602 /* Tight loop with builtins only:
9603 * "while kill -0 $child; do true; done"
9604 * will never exit even if $child died, unless we do this
9605 * to reap the zombie and make kill detect that it's gone: */
9606 dowait(DOWAIT_NONBLOCK, NULL);
9608 if (evalbltin(cmdentry.u.cmd, argc, argv, flags)) {
9610 int i = exception_type;
9615 exit_status = 128 + SIGINT;
9617 exit_status = 128 + pending_sig;
9618 exitstatus = exit_status;
9619 if (i == EXINT || spclbltin > 0) {
9621 longjmp(exception_handler->loc, 1);
9628 listsetvar(varlist.list, 0);
9629 /* See above for the rationale */
9630 dowait(DOWAIT_NONBLOCK, NULL);
9631 if (evalfun(cmdentry.u.func, argc, argv, flags))
9634 status = exitstatus;
9639 if (cmd->ncmd.redirect)
9640 popredir(/*drop:*/ cmd_is_exec, /*restore:*/ cmd_is_exec);
9642 /* dsl: I think this is intended to be used to support
9643 * '_' in 'vi' command mode during line editing...
9644 * However I implemented that within libedit itself.
9646 setvar0("_", lastarg);
9648 popstackmark(&smark);
9654 evalbltin(const struct builtincmd *cmd, int argc, char **argv, int flags)
9656 char *volatile savecmdname;
9657 struct jmploc *volatile savehandler;
9658 struct jmploc jmploc;
9662 savecmdname = commandname;
9663 savehandler = exception_handler;
9664 i = setjmp(jmploc.loc);
9667 exception_handler = &jmploc;
9668 commandname = argv[0];
9670 optptr = NULL; /* initialize nextopt */
9672 status = evalcmd(argc, argv, flags);
9674 status = (*cmd->builtin)(argc, argv);
9675 flush_stdout_stderr();
9676 status |= ferror(stdout);
9677 exitstatus = status;
9680 commandname = savecmdname;
9681 exception_handler = savehandler;
9687 goodname(const char *p)
9689 return endofname(p)[0] == '\0';
9694 * Search for a command. This is called before we fork so that the
9695 * location of the command will be available in the parent as well as
9696 * the child. The check for "goodname" is an overly conservative
9697 * check that the name will not be subject to expansion.
9700 prehash(union node *n)
9702 struct cmdentry entry;
9704 if (n->type == NCMD && n->ncmd.args && goodname(n->ncmd.args->narg.text))
9705 find_command(n->ncmd.args->narg.text, &entry, 0, pathval());
9709 /* ============ Builtin commands
9711 * Builtin commands whose functions are closely tied to evaluation
9712 * are implemented here.
9716 * Handle break and continue commands. Break, continue, and return are
9717 * all handled by setting the evalskip flag. The evaluation routines
9718 * above all check this flag, and if it is set they start skipping
9719 * commands rather than executing them. The variable skipcount is
9720 * the number of loops to break/continue, or the number of function
9721 * levels to return. (The latter is always 1.) It should probably
9722 * be an error to break out of more loops than exist, but it isn't
9723 * in the standard shell so we don't make it one here.
9725 static int FAST_FUNC
9726 breakcmd(int argc UNUSED_PARAM, char **argv)
9728 int n = argv[1] ? number(argv[1]) : 1;
9731 ash_msg_and_raise_error(msg_illnum, argv[1]);
9735 evalskip = (**argv == 'c') ? SKIPCONT : SKIPBREAK;
9742 /* ============ input.c
9744 * This implements the input routines used by the parser.
9748 INPUT_PUSH_FILE = 1,
9749 INPUT_NOFILE_OK = 2,
9752 static smallint checkkwd;
9753 /* values of checkkwd variable */
9754 #define CHKALIAS 0x1
9759 * Push a string back onto the input at this current parsefile level.
9760 * We handle aliases this way.
9762 #if !ENABLE_ASH_ALIAS
9763 #define pushstring(s, ap) pushstring(s)
9766 pushstring(char *s, struct alias *ap)
9773 if (g_parsefile->strpush) {
9774 sp = ckzalloc(sizeof(*sp));
9775 sp->prev = g_parsefile->strpush;
9777 sp = &(g_parsefile->basestrpush);
9779 g_parsefile->strpush = sp;
9780 sp->prev_string = g_parsefile->next_to_pgetc;
9781 sp->prev_left_in_line = g_parsefile->left_in_line;
9782 sp->unget = g_parsefile->unget;
9783 memcpy(sp->lastc, g_parsefile->lastc, sizeof(sp->lastc));
9784 #if ENABLE_ASH_ALIAS
9787 ap->flag |= ALIASINUSE;
9791 g_parsefile->next_to_pgetc = s;
9792 g_parsefile->left_in_line = len;
9793 g_parsefile->unget = 0;
9800 struct strpush *sp = g_parsefile->strpush;
9803 #if ENABLE_ASH_ALIAS
9805 if (g_parsefile->next_to_pgetc[-1] == ' '
9806 || g_parsefile->next_to_pgetc[-1] == '\t'
9808 checkkwd |= CHKALIAS;
9810 if (sp->string != sp->ap->val) {
9813 sp->ap->flag &= ~ALIASINUSE;
9814 if (sp->ap->flag & ALIASDEAD) {
9815 unalias(sp->ap->name);
9819 g_parsefile->next_to_pgetc = sp->prev_string;
9820 g_parsefile->left_in_line = sp->prev_left_in_line;
9821 g_parsefile->unget = sp->unget;
9822 memcpy(g_parsefile->lastc, sp->lastc, sizeof(sp->lastc));
9823 g_parsefile->strpush = sp->prev;
9824 if (sp != &(g_parsefile->basestrpush))
9833 char *buf = g_parsefile->buf;
9835 g_parsefile->next_to_pgetc = buf;
9836 #if ENABLE_FEATURE_EDITING
9838 if (!iflag || g_parsefile->pf_fd != STDIN_FILENO)
9839 nr = nonblock_immune_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1);
9842 # if ENABLE_ASH_IDLE_TIMEOUT
9844 const char *tmout_var = lookupvar("TMOUT");
9846 timeout = atoi(tmout_var) * 1000;
9852 # if ENABLE_FEATURE_TAB_COMPLETION
9853 line_input_state->path_lookup = pathval();
9855 reinit_unicode_for_ash();
9856 nr = read_line_input(line_input_state, cmdedit_prompt, buf, IBUFSIZ, timeout);
9858 /* Ctrl+C pressed */
9869 /* Ctrl+D pressed */
9872 # if ENABLE_ASH_IDLE_TIMEOUT
9873 else if (errno == EAGAIN && timeout > 0) {
9874 puts("\007timed out waiting for input: auto-logout");
9881 nr = nonblock_immune_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1);
9884 #if 0 /* disabled: nonblock_immune_read() handles this problem */
9886 if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
9887 int flags = fcntl(0, F_GETFL);
9888 if (flags >= 0 && (flags & O_NONBLOCK)) {
9889 flags &= ~O_NONBLOCK;
9890 if (fcntl(0, F_SETFL, flags) >= 0) {
9891 out2str("sh: turning off NDELAY mode\n");
9902 * Refill the input buffer and return the next input character:
9904 * 1) If a string was pushed back on the input, pop it;
9905 * 2) If an EOF was pushed back (g_parsefile->left_in_line < -BIGNUM)
9906 * or we are reading from a string so we can't refill the buffer,
9908 * 3) If there is more stuff in this buffer, use it else call read to fill it.
9909 * 4) Process input up to the next newline, deleting nul characters.
9911 //#define pgetc_debug(...) bb_error_msg(__VA_ARGS__)
9912 #define pgetc_debug(...) ((void)0)
9913 static int pgetc(void);
9920 if (g_parsefile->strpush) {
9921 #if ENABLE_ASH_ALIAS
9922 if (g_parsefile->left_in_line == -1
9923 && g_parsefile->strpush->ap
9924 && g_parsefile->next_to_pgetc[-1] != ' '
9925 && g_parsefile->next_to_pgetc[-1] != '\t'
9927 pgetc_debug("preadbuffer PEOA");
9934 /* on both branches above g_parsefile->left_in_line < 0.
9935 * "pgetc" needs refilling.
9938 /* -90 is our -BIGNUM. Below we use -99 to mark "EOF on read",
9939 * pungetc() may increment it a few times.
9940 * Assuming it won't increment it to less than -90.
9942 if (g_parsefile->left_in_line < -90 || g_parsefile->buf == NULL) {
9943 pgetc_debug("preadbuffer PEOF1");
9944 /* even in failure keep left_in_line and next_to_pgetc
9945 * in lock step, for correct multi-layer pungetc.
9946 * left_in_line was decremented before preadbuffer(),
9947 * must inc next_to_pgetc: */
9948 g_parsefile->next_to_pgetc++;
9952 more = g_parsefile->left_in_buffer;
9954 flush_stdout_stderr();
9958 /* don't try reading again */
9959 g_parsefile->left_in_line = -99;
9960 pgetc_debug("preadbuffer PEOF2");
9961 g_parsefile->next_to_pgetc++;
9966 /* Find out where's the end of line.
9967 * Set g_parsefile->left_in_line
9968 * and g_parsefile->left_in_buffer acordingly.
9969 * NUL chars are deleted.
9971 q = g_parsefile->next_to_pgetc;
9979 memmove(q, q + 1, more);
9983 g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1;
9989 g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1;
9990 if (g_parsefile->left_in_line < 0)
9995 g_parsefile->left_in_buffer = more;
10000 out2str(g_parsefile->next_to_pgetc);
10004 pgetc_debug("preadbuffer at %d:%p'%s'",
10005 g_parsefile->left_in_line,
10006 g_parsefile->next_to_pgetc,
10007 g_parsefile->next_to_pgetc);
10008 return (unsigned char)*g_parsefile->next_to_pgetc++;
10014 g_parsefile->linno++;
10015 setprompt_if(doprompt, 2);
10020 g_parsefile->linno++;
10021 needprompt = doprompt;
10029 pgetc_debug("pgetc at %d:%p'%s'",
10030 g_parsefile->left_in_line,
10031 g_parsefile->next_to_pgetc,
10032 g_parsefile->next_to_pgetc);
10033 if (g_parsefile->unget)
10034 return g_parsefile->lastc[--g_parsefile->unget];
10036 if (--g_parsefile->left_in_line >= 0)
10037 c = (signed char)*g_parsefile->next_to_pgetc++;
10041 g_parsefile->lastc[1] = g_parsefile->lastc[0];
10042 g_parsefile->lastc[0] = c;
10047 #if ENABLE_ASH_ALIAS
10049 pgetc_without_PEOA(void)
10053 pgetc_debug("pgetc at %d:%p'%s'",
10054 g_parsefile->left_in_line,
10055 g_parsefile->next_to_pgetc,
10056 g_parsefile->next_to_pgetc);
10058 } while (c == PEOA);
10062 # define pgetc_without_PEOA() pgetc()
10066 * Read a line from the script.
10069 pfgets(char *line, int len)
10075 while (--nleft > 0) {
10076 c = pgetc_without_PEOA();
10091 * Undo a call to pgetc. Only two characters may be pushed back.
10092 * PEOF may be pushed back.
10097 g_parsefile->unget++;
10100 /* This one eats backslash+newline */
10106 while ((c = pgetc()) == '\\') {
10107 if (pgetc() != '\n') {
10119 * To handle the "." command, a stack of input files is used. Pushfile
10120 * adds a new entry to the stack and popfile restores the previous level.
10125 struct parsefile *pf;
10127 pf = ckzalloc(sizeof(*pf));
10128 pf->prev = g_parsefile;
10130 /*pf->strpush = NULL; - ckzalloc did it */
10131 /*pf->basestrpush.prev = NULL;*/
10139 struct parsefile *pf = g_parsefile;
10142 if (pf->pf_fd >= 0)
10145 while (pf->strpush)
10147 g_parsefile = pf->prev;
10153 * Return to top level.
10158 while (g_parsefile != &basepf)
10163 * Close the file(s) that the shell is reading commands from. Called
10164 * after a fork is done.
10170 if (g_parsefile->pf_fd > 0) {
10171 close(g_parsefile->pf_fd);
10172 g_parsefile->pf_fd = 0;
10177 * Like setinputfile, but takes an open file descriptor. Call this with
10181 setinputfd(int fd, int push)
10185 g_parsefile->buf = NULL;
10187 g_parsefile->pf_fd = fd;
10188 if (g_parsefile->buf == NULL)
10189 g_parsefile->buf = ckmalloc(IBUFSIZ);
10190 g_parsefile->left_in_buffer = 0;
10191 g_parsefile->left_in_line = 0;
10192 g_parsefile->linno = 1;
10196 * Set the input to take input from a file. If push is set, push the
10197 * old input onto the stack first.
10200 setinputfile(const char *fname, int flags)
10205 fd = open(fname, O_RDONLY);
10207 if (flags & INPUT_NOFILE_OK)
10210 ash_msg_and_raise_error("can't open '%s'", fname);
10215 close_on_exec_on(fd);
10216 setinputfd(fd, flags & INPUT_PUSH_FILE);
10223 * Like setinputfile, but takes input from a string.
10226 setinputstring(char *string)
10230 g_parsefile->next_to_pgetc = string;
10231 g_parsefile->left_in_line = strlen(string);
10232 g_parsefile->buf = NULL;
10233 g_parsefile->linno = 1;
10238 /* ============ mail.c
10240 * Routines to check for mail.
10243 #if ENABLE_ASH_MAIL
10245 /* Hash of mtimes of mailboxes */
10246 static unsigned mailtime_hash;
10247 /* Set if MAIL or MAILPATH is changed. */
10248 static smallint mail_var_path_changed;
10251 * Print appropriate message(s) if mail has arrived.
10252 * If mail_var_path_changed is set,
10253 * then the value of MAIL has mail_var_path_changed,
10254 * so we just update the values.
10263 struct stackmark smark;
10266 setstackmark(&smark);
10267 mpath = mpathset() ? mpathval() : mailval();
10270 p = path_advance(&mpath, nullstr);
10275 for (q = p; *q; q++)
10281 q[-1] = '\0'; /* delete trailing '/' */
10282 if (stat(p, &statb) < 0) {
10285 /* Very simplistic "hash": just a sum of all mtimes */
10286 new_hash += (unsigned)statb.st_mtime;
10288 if (!mail_var_path_changed && mailtime_hash != new_hash) {
10289 if (mailtime_hash != 0)
10290 out2str("you have mail\n");
10291 mailtime_hash = new_hash;
10293 mail_var_path_changed = 0;
10294 popstackmark(&smark);
10297 static void FAST_FUNC
10298 changemail(const char *val UNUSED_PARAM)
10300 mail_var_path_changed = 1;
10303 #endif /* ASH_MAIL */
10306 /* ============ ??? */
10309 * Set the shell parameters.
10312 setparam(char **argv)
10318 for (nparam = 0; argv[nparam]; nparam++)
10320 ap = newparam = ckmalloc((nparam + 1) * sizeof(*ap));
10322 *ap++ = ckstrdup(*argv++);
10325 freeparam(&shellparam);
10326 shellparam.malloced = 1;
10327 shellparam.nparam = nparam;
10328 shellparam.p = newparam;
10329 #if ENABLE_ASH_GETOPTS
10330 shellparam.optind = 1;
10331 shellparam.optoff = -1;
10336 * Process shell options. The global variable argptr contains a pointer
10337 * to the argument list; we advance it past the options.
10339 * SUSv3 section 2.8.1 "Consequences of Shell Errors" says:
10340 * For a non-interactive shell, an error condition encountered
10341 * by a special built-in ... shall cause the shell to write a diagnostic message
10342 * to standard error and exit as shown in the following table:
10343 * Error Special Built-In
10345 * Utility syntax error (option or operand error) Shall exit
10347 * However, in bug 1142 (http://busybox.net/bugs/view.php?id=1142)
10348 * we see that bash does not do that (set "finishes" with error code 1 instead,
10349 * and shell continues), and people rely on this behavior!
10351 * set -o barfoo 2>/dev/null
10354 * Oh well. Let's mimic that.
10357 plus_minus_o(char *name, int val)
10362 for (i = 0; i < NOPTS; i++) {
10363 if (strcmp(name, optnames(i)) == 0) {
10368 ash_msg("illegal option %co %s", val ? '-' : '+', name);
10371 for (i = 0; i < NOPTS; i++) {
10373 out1fmt("%-16s%s\n", optnames(i), optlist[i] ? "on" : "off");
10375 out1fmt("set %co %s\n", optlist[i] ? '-' : '+', optnames(i));
10381 setoption(int flag, int val)
10385 for (i = 0; i < NOPTS; i++) {
10386 if (optletters(i) == flag) {
10391 ash_msg_and_raise_error("illegal option %c%c", val ? '-' : '+', flag);
10395 options(int cmdline)
10403 while ((p = *argptr) != NULL) {
10405 if (c != '-' && c != '+')
10408 val = 0; /* val = 0 if c == '+' */
10411 if (p[0] == '\0' || LONE_DASH(p)) {
10413 /* "-" means turn off -x and -v */
10416 /* "--" means reset params */
10417 else if (*argptr == NULL)
10420 break; /* "-" or "--" terminates options */
10423 /* first char was + or - */
10424 while ((c = *p++) != '\0') {
10425 /* bash 3.2 indeed handles -c CMD and +c CMD the same */
10426 if (c == 'c' && cmdline) {
10427 minusc = p; /* command is after shell args */
10428 } else if (c == 'o') {
10429 if (plus_minus_o(*argptr, val)) {
10430 /* it already printed err message */
10431 return 1; /* error */
10435 } else if (cmdline && (c == 'l')) { /* -l or +l == --login */
10437 /* bash does not accept +-login, we also won't */
10438 } else if (cmdline && val && (c == '-')) { /* long options */
10439 if (strcmp(p, "login") == 0)
10451 * The shift builtin command.
10453 static int FAST_FUNC
10454 shiftcmd(int argc UNUSED_PARAM, char **argv)
10461 n = number(argv[1]);
10462 if (n > shellparam.nparam)
10463 n = 0; /* bash compat, was = shellparam.nparam; */
10465 shellparam.nparam -= n;
10466 for (ap1 = shellparam.p; --n >= 0; ap1++) {
10467 if (shellparam.malloced)
10470 ap2 = shellparam.p;
10471 while ((*ap2++ = *ap1++) != NULL)
10473 #if ENABLE_ASH_GETOPTS
10474 shellparam.optind = 1;
10475 shellparam.optoff = -1;
10482 * POSIX requires that 'set' (but not export or readonly) output the
10483 * variables in lexicographic order - by the locale's collating order (sigh).
10484 * Maybe we could keep them in an ordered balanced binary tree
10485 * instead of hashed lists.
10486 * For now just roll 'em through qsort for printing...
10489 showvars(const char *sep_prefix, int on, int off)
10492 char **ep, **epend;
10494 ep = listvars(on, off, &epend);
10495 qsort(ep, epend - ep, sizeof(char *), vpcmp);
10497 sep = *sep_prefix ? " " : sep_prefix;
10499 for (; ep < epend; ep++) {
10503 p = strchrnul(*ep, '=');
10506 q = single_quote(++p);
10507 out1fmt("%s%s%.*s%s\n", sep_prefix, sep, (int)(p - *ep), *ep, q);
10513 * The set command builtin.
10515 static int FAST_FUNC
10516 setcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
10521 return showvars(nullstr, 0, VUNSET);
10524 retval = options(/*cmdline:*/ 0);
10525 if (retval == 0) { /* if no parse error... */
10527 if (*argptr != NULL) {
10535 #if ENABLE_ASH_RANDOM_SUPPORT
10536 static void FAST_FUNC
10537 change_random(const char *value)
10541 if (value == NULL) {
10542 /* "get", generate */
10543 t = next_random(&random_gen);
10544 /* set without recursion */
10545 setvar(vrandom.var_text, utoa(t), VNOFUNC);
10546 vrandom.flags &= ~VNOFUNC;
10549 t = strtoul(value, NULL, 10);
10550 INIT_RANDOM_T(&random_gen, (t ? t : 1), t);
10555 #if ENABLE_ASH_GETOPTS
10557 getopts(char *optstr, char *optvar, char **optfirst, int *param_optind, int *optoff)
10568 optnext = optfirst + *param_optind - 1;
10570 if (*param_optind <= 1 || *optoff < 0 || (int)strlen(optnext[-1]) < *optoff)
10573 p = optnext[-1] + *optoff;
10574 if (p == NULL || *p == '\0') {
10575 /* Current word is done, advance */
10577 if (p == NULL || *p != '-' || *++p == '\0') {
10584 if (LONE_DASH(p)) /* check for "--" */
10589 for (q = optstr; *q != c;) {
10591 if (optstr[0] == ':') {
10593 /*sbuf[1] = '\0'; - already is */
10594 err |= setvarsafe("OPTARG", sbuf, 0);
10596 fprintf(stderr, "Illegal option -%c\n", c);
10597 unsetvar("OPTARG");
10607 if (*p == '\0' && (p = *optnext) == NULL) {
10608 if (optstr[0] == ':') {
10610 /*sbuf[1] = '\0'; - already is */
10611 err |= setvarsafe("OPTARG", sbuf, 0);
10614 fprintf(stderr, "No arg for -%c option\n", c);
10615 unsetvar("OPTARG");
10623 err |= setvarsafe("OPTARG", p, 0);
10626 err |= setvarsafe("OPTARG", nullstr, 0);
10628 *optoff = p ? p - *(optnext - 1) : -1;
10629 *param_optind = optnext - optfirst + 1;
10630 err |= setvarsafe("OPTIND", itoa(*param_optind), VNOFUNC);
10632 /*sbuf[1] = '\0'; - already is */
10633 err |= setvarsafe(optvar, sbuf, 0);
10637 flush_stdout_stderr();
10638 raise_exception(EXERROR);
10644 * The getopts builtin. Shellparam.optnext points to the next argument
10645 * to be processed. Shellparam.optptr points to the next character to
10646 * be processed in the current argument. If shellparam.optnext is NULL,
10647 * then it's the first time getopts has been called.
10649 static int FAST_FUNC
10650 getoptscmd(int argc, char **argv)
10655 ash_msg_and_raise_error("usage: getopts optstring var [arg]");
10657 optbase = shellparam.p;
10658 if (shellparam.optind > shellparam.nparam + 1) {
10659 shellparam.optind = 1;
10660 shellparam.optoff = -1;
10663 optbase = &argv[3];
10664 if (shellparam.optind > argc - 2) {
10665 shellparam.optind = 1;
10666 shellparam.optoff = -1;
10670 return getopts(argv[1], argv[2], optbase, &shellparam.optind,
10671 &shellparam.optoff);
10673 #endif /* ASH_GETOPTS */
10676 /* ============ Shell parser */
10679 struct heredoc *next; /* next here document in list */
10680 union node *here; /* redirection node */
10681 char *eofmark; /* string indicating end of input */
10682 smallint striptabs; /* if set, strip leading tabs */
10685 static smallint tokpushback; /* last token pushed back */
10686 static smallint quoteflag; /* set if (part of) last token was quoted */
10687 static token_id_t lasttoken; /* last token read (integer id Txxx) */
10688 static struct heredoc *heredoclist; /* list of here documents to read */
10689 static char *wordtext; /* text of last word returned by readtoken */
10690 static struct nodelist *backquotelist;
10691 static union node *redirnode;
10692 static struct heredoc *heredoc;
10694 static const char *
10695 tokname(char *buf, int tok)
10698 return tokname_array[tok];
10699 sprintf(buf, "\"%s\"", tokname_array[tok]);
10703 /* raise_error_unexpected_syntax:
10704 * Called when an unexpected token is read during the parse. The argument
10705 * is the token that is expected, or -1 if more than one type of token can
10706 * occur at this point.
10708 static void raise_error_unexpected_syntax(int) NORETURN;
10710 raise_error_unexpected_syntax(int token)
10716 l = sprintf(msg, "unexpected %s", tokname(buf, lasttoken));
10718 sprintf(msg + l, " (expecting %s)", tokname(buf, token));
10719 raise_error_syntax(msg);
10723 #define EOFMARKLEN 79
10725 /* parsing is heavily cross-recursive, need these forward decls */
10726 static union node *andor(void);
10727 static union node *pipeline(void);
10728 static union node *parse_command(void);
10729 static void parseheredoc(void);
10730 static int peektoken(void);
10731 static int readtoken(void);
10733 static union node *
10736 union node *n1, *n2, *n3;
10741 switch (peektoken()) {
10749 if (!n1 && (nlflag & 1))
10755 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10756 if (nlflag == 2 && ((1 << peektoken()) & tokendlist))
10762 if (tok == TBACKGND) {
10763 if (n2->type == NPIPE) {
10764 n2->npipe.pipe_backgnd = 1;
10766 if (n2->type != NREDIR) {
10767 n3 = stzalloc(sizeof(struct nredir));
10769 /*n3->nredir.redirect = NULL; - stzalloc did it */
10772 n2->type = NBACKGND;
10778 n3 = stzalloc(sizeof(struct nbinary));
10780 n3->nbinary.ch1 = n1;
10781 n3->nbinary.ch2 = n2;
10794 raise_error_unexpected_syntax(-1);
10801 static union node *
10804 union node *n1, *n2, *n3;
10812 } else if (t == TOR) {
10818 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10820 n3 = stzalloc(sizeof(struct nbinary));
10822 n3->nbinary.ch1 = n1;
10823 n3->nbinary.ch2 = n2;
10828 static union node *
10831 union node *n1, *n2, *pipenode;
10832 struct nodelist *lp, *prev;
10836 TRACE(("pipeline: entered\n"));
10837 if (readtoken() == TNOT) {
10839 checkkwd = CHKKWD | CHKALIAS;
10842 n1 = parse_command();
10843 if (readtoken() == TPIPE) {
10844 pipenode = stzalloc(sizeof(struct npipe));
10845 pipenode->type = NPIPE;
10846 /*pipenode->npipe.pipe_backgnd = 0; - stzalloc did it */
10847 lp = stzalloc(sizeof(struct nodelist));
10848 pipenode->npipe.cmdlist = lp;
10852 lp = stzalloc(sizeof(struct nodelist));
10853 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10854 lp->n = parse_command();
10856 } while (readtoken() == TPIPE);
10862 n2 = stzalloc(sizeof(struct nnot));
10870 static union node *
10875 n = stzalloc(sizeof(struct narg));
10877 /*n->narg.next = NULL; - stzalloc did it */
10878 n->narg.text = wordtext;
10879 n->narg.backquote = backquotelist;
10884 fixredir(union node *n, const char *text, int err)
10888 TRACE(("Fix redir %s %d\n", text, err));
10890 n->ndup.vname = NULL;
10892 fd = bb_strtou(text, NULL, 10);
10893 if (!errno && fd >= 0)
10894 n->ndup.dupfd = fd;
10895 else if (LONE_DASH(text))
10896 n->ndup.dupfd = -1;
10899 raise_error_syntax("bad fd number");
10900 n->ndup.vname = makename();
10905 * Returns true if the text contains nothing to expand (no dollar signs
10909 noexpand(const char *text)
10913 while ((c = *text++) != '\0') {
10914 if (c == CTLQUOTEMARK)
10918 else if (SIT(c, BASESYNTAX) == CCTL)
10927 union node *n = redirnode;
10929 if (readtoken() != TWORD)
10930 raise_error_unexpected_syntax(-1);
10931 if (n->type == NHERE) {
10932 struct heredoc *here = heredoc;
10936 if (quoteflag == 0)
10938 TRACE(("Here document %d\n", n->type));
10939 if (!noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN)
10940 raise_error_syntax("illegal eof marker for << redirection");
10941 rmescapes(wordtext, 0);
10942 here->eofmark = wordtext;
10944 if (heredoclist == NULL)
10945 heredoclist = here;
10947 for (p = heredoclist; p->next; p = p->next)
10951 } else if (n->type == NTOFD || n->type == NFROMFD) {
10952 fixredir(n, wordtext, 0);
10954 n->nfile.fname = makename();
10958 static union node *
10961 union node *args, **app;
10962 union node *n = NULL;
10963 union node *vars, **vpp;
10964 union node **rpp, *redir;
10966 #if ENABLE_ASH_BASH_COMPAT
10967 smallint double_brackets_flag = 0;
10968 smallint function_flag = 0;
10978 savecheckkwd = CHKALIAS;
10981 checkkwd = savecheckkwd;
10984 #if ENABLE_ASH_BASH_COMPAT
10986 if (peektoken() != TWORD)
10987 raise_error_unexpected_syntax(TWORD);
10990 case TAND: /* "&&" */
10991 case TOR: /* "||" */
10992 if (!double_brackets_flag) {
10996 wordtext = (char *) (t == TAND ? "-a" : "-o");
10999 n = stzalloc(sizeof(struct narg));
11001 /*n->narg.next = NULL; - stzalloc did it */
11002 n->narg.text = wordtext;
11003 #if ENABLE_ASH_BASH_COMPAT
11004 if (strcmp("[[", wordtext) == 0)
11005 double_brackets_flag = 1;
11006 else if (strcmp("]]", wordtext) == 0)
11007 double_brackets_flag = 0;
11009 n->narg.backquote = backquotelist;
11010 if (savecheckkwd && isassignment(wordtext)) {
11012 vpp = &n->narg.next;
11015 app = &n->narg.next;
11018 #if ENABLE_ASH_BASH_COMPAT
11019 if (function_flag) {
11020 checkkwd = CHKNL | CHKKWD;
11021 switch (peektoken()) {
11033 if (strcmp("[[", wordtext) == 0)
11037 raise_error_unexpected_syntax(-1);
11043 *rpp = n = redirnode;
11044 rpp = &n->nfile.next;
11045 parsefname(); /* read name of redirection file */
11048 IF_ASH_BASH_COMPAT(do_func:)
11049 if (args && app == &args->narg.next
11052 struct builtincmd *bcmd;
11055 /* We have a function */
11056 if (IF_ASH_BASH_COMPAT(!function_flag &&) readtoken() != TRP)
11057 raise_error_unexpected_syntax(TRP);
11058 name = n->narg.text;
11059 if (!goodname(name)
11060 || ((bcmd = find_builtin(name)) && IS_BUILTIN_SPECIAL(bcmd))
11062 raise_error_syntax("bad function name");
11065 checkkwd = CHKNL | CHKKWD | CHKALIAS;
11066 n->narg.next = parse_command();
11069 IF_ASH_BASH_COMPAT(function_flag = 0;)
11080 n = stzalloc(sizeof(struct ncmd));
11082 n->ncmd.args = args;
11083 n->ncmd.assign = vars;
11084 n->ncmd.redirect = redir;
11088 static union node *
11089 parse_command(void)
11091 union node *n1, *n2;
11092 union node *ap, **app;
11093 union node *cp, **cpp;
11094 union node *redir, **rpp;
11101 switch (readtoken()) {
11103 raise_error_unexpected_syntax(-1);
11106 n1 = stzalloc(sizeof(struct nif));
11108 n1->nif.test = list(0);
11109 if (readtoken() != TTHEN)
11110 raise_error_unexpected_syntax(TTHEN);
11111 n1->nif.ifpart = list(0);
11113 while (readtoken() == TELIF) {
11114 n2->nif.elsepart = stzalloc(sizeof(struct nif));
11115 n2 = n2->nif.elsepart;
11117 n2->nif.test = list(0);
11118 if (readtoken() != TTHEN)
11119 raise_error_unexpected_syntax(TTHEN);
11120 n2->nif.ifpart = list(0);
11122 if (lasttoken == TELSE)
11123 n2->nif.elsepart = list(0);
11125 n2->nif.elsepart = NULL;
11133 n1 = stzalloc(sizeof(struct nbinary));
11134 n1->type = (lasttoken == TWHILE) ? NWHILE : NUNTIL;
11135 n1->nbinary.ch1 = list(0);
11138 TRACE(("expecting DO got '%s' %s\n", tokname_array[got],
11139 got == TWORD ? wordtext : ""));
11140 raise_error_unexpected_syntax(TDO);
11142 n1->nbinary.ch2 = list(0);
11147 if (readtoken() != TWORD || quoteflag || !goodname(wordtext))
11148 raise_error_syntax("bad for loop variable");
11149 n1 = stzalloc(sizeof(struct nfor));
11151 n1->nfor.var = wordtext;
11152 checkkwd = CHKNL | CHKKWD | CHKALIAS;
11153 if (readtoken() == TIN) {
11155 while (readtoken() == TWORD) {
11156 n2 = stzalloc(sizeof(struct narg));
11158 /*n2->narg.next = NULL; - stzalloc did it */
11159 n2->narg.text = wordtext;
11160 n2->narg.backquote = backquotelist;
11162 app = &n2->narg.next;
11165 n1->nfor.args = ap;
11166 if (lasttoken != TNL && lasttoken != TSEMI)
11167 raise_error_unexpected_syntax(-1);
11169 n2 = stzalloc(sizeof(struct narg));
11171 /*n2->narg.next = NULL; - stzalloc did it */
11172 n2->narg.text = (char *)dolatstr;
11173 /*n2->narg.backquote = NULL;*/
11174 n1->nfor.args = n2;
11176 * Newline or semicolon here is optional (but note
11177 * that the original Bourne shell only allowed NL).
11179 if (lasttoken != TSEMI)
11182 checkkwd = CHKNL | CHKKWD | CHKALIAS;
11183 if (readtoken() != TDO)
11184 raise_error_unexpected_syntax(TDO);
11185 n1->nfor.body = list(0);
11189 n1 = stzalloc(sizeof(struct ncase));
11191 if (readtoken() != TWORD)
11192 raise_error_unexpected_syntax(TWORD);
11193 n1->ncase.expr = n2 = stzalloc(sizeof(struct narg));
11195 /*n2->narg.next = NULL; - stzalloc did it */
11196 n2->narg.text = wordtext;
11197 n2->narg.backquote = backquotelist;
11198 checkkwd = CHKNL | CHKKWD | CHKALIAS;
11199 if (readtoken() != TIN)
11200 raise_error_unexpected_syntax(TIN);
11201 cpp = &n1->ncase.cases;
11203 checkkwd = CHKNL | CHKKWD;
11205 while (t != TESAC) {
11206 if (lasttoken == TLP)
11208 *cpp = cp = stzalloc(sizeof(struct nclist));
11210 app = &cp->nclist.pattern;
11212 *app = ap = stzalloc(sizeof(struct narg));
11214 /*ap->narg.next = NULL; - stzalloc did it */
11215 ap->narg.text = wordtext;
11216 ap->narg.backquote = backquotelist;
11217 if (readtoken() != TPIPE)
11219 app = &ap->narg.next;
11222 //ap->narg.next = NULL;
11223 if (lasttoken != TRP)
11224 raise_error_unexpected_syntax(TRP);
11225 cp->nclist.body = list(2);
11227 cpp = &cp->nclist.next;
11229 checkkwd = CHKNL | CHKKWD;
11233 raise_error_unexpected_syntax(TENDCASE);
11240 n1 = stzalloc(sizeof(struct nredir));
11241 n1->type = NSUBSHELL;
11242 n1->nredir.n = list(0);
11243 /*n1->nredir.redirect = NULL; - stzalloc did it */
11250 IF_ASH_BASH_COMPAT(case TFUNCTION:)
11254 return simplecmd();
11257 if (readtoken() != t)
11258 raise_error_unexpected_syntax(t);
11261 /* Now check for redirection which may follow command */
11262 checkkwd = CHKKWD | CHKALIAS;
11264 while (readtoken() == TREDIR) {
11265 *rpp = n2 = redirnode;
11266 rpp = &n2->nfile.next;
11272 if (n1->type != NSUBSHELL) {
11273 n2 = stzalloc(sizeof(struct nredir));
11278 n1->nredir.redirect = redir;
11283 #if ENABLE_ASH_BASH_COMPAT
11285 decode_dollar_squote(void)
11287 static const char C_escapes[] ALIGN1 = "nrbtfav""x\\01234567";
11293 p = strchr(C_escapes, c);
11298 if ((unsigned char)(c - '0') <= 7) { /* \ooo */
11302 } while ((unsigned char)(c - '0') <= 7 && --cnt);
11304 } else if (c == 'x') { /* \xHH */
11308 } while (isxdigit(c) && --cnt);
11310 if (cnt == 3) { /* \x but next char is "bad" */
11314 } else { /* simple seq like \\ or \t */
11319 c = bb_process_escape_sequence((void*)&p);
11320 } else { /* unrecognized "\z": print both chars unless ' or " */
11321 if (c != '\'' && c != '"') {
11323 c |= 0x100; /* "please encode \, then me" */
11331 * If eofmark is NULL, read a word or a redirection symbol. If eofmark
11332 * is not NULL, read a here document. In the latter case, eofmark is the
11333 * word which marks the end of the document and striptabs is true if
11334 * leading tabs should be stripped from the document. The argument c
11335 * is the first character of the input token or document.
11337 * Because C does not have internal subroutines, I have simulated them
11338 * using goto's to implement the subroutine linkage. The following macros
11339 * will run code that appears at the end of readtoken1.
11341 #define CHECKEND() {goto checkend; checkend_return:;}
11342 #define PARSEREDIR() {goto parseredir; parseredir_return:;}
11343 #define PARSESUB() {goto parsesub; parsesub_return:;}
11344 #define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;}
11345 #define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;}
11346 #define PARSEARITH() {goto parsearith; parsearith_return:;}
11348 readtoken1(int c, int syntax, char *eofmark, int striptabs)
11350 /* NB: syntax parameter fits into smallint */
11351 /* c parameter is an unsigned char or PEOF or PEOA */
11354 char line[EOFMARKLEN + 1];
11355 struct nodelist *bqlist;
11359 smallint prevsyntax; /* syntax before arithmetic */
11360 #if ENABLE_ASH_EXPAND_PRMT
11361 smallint pssyntax; /* we are expanding a prompt string */
11363 int varnest; /* levels of variables expansion */
11364 int arinest; /* levels of arithmetic expansion */
11365 int parenlevel; /* levels of parens in arithmetic */
11366 int dqvarnest; /* levels of variables expansion within double quotes */
11368 IF_ASH_BASH_COMPAT(smallint bash_dollar_squote = 0;)
11370 startlinno = g_parsefile->linno;
11374 #if ENABLE_ASH_EXPAND_PRMT
11375 pssyntax = (syntax == PSSYNTAX);
11379 dblquote = (syntax == DQSYNTAX);
11385 STARTSTACKSTR(out);
11387 /* For each line, until end of word */
11388 CHECKEND(); /* set c to PEOF if at end of here document */
11389 for (;;) { /* until end of line or end of word */
11390 CHECKSTRSPACE(4, out); /* permit 4 calls to USTPUTC */
11391 switch (SIT(c, syntax)) {
11392 case CNL: /* '\n' */
11393 if (syntax == BASESYNTAX)
11394 goto endword; /* exit outer loop */
11398 goto loop; /* continue outer loop */
11403 #if ENABLE_ASH_BASH_COMPAT
11404 if (c == '\\' && bash_dollar_squote) {
11405 c = decode_dollar_squote();
11407 /* skip $'\000', $'\x00' (like bash) */
11411 /* Unknown escape. Encode as '\z' */
11412 c = (unsigned char)c;
11413 if (eofmark == NULL || dblquote)
11414 USTPUTC(CTLESC, out);
11415 USTPUTC('\\', out);
11419 if (eofmark == NULL || dblquote)
11420 USTPUTC(CTLESC, out);
11423 case CBACK: /* backslash */
11424 c = pgetc_without_PEOA();
11426 USTPUTC(CTLESC, out);
11427 USTPUTC('\\', out);
11429 } else if (c == '\n') {
11432 #if ENABLE_ASH_EXPAND_PRMT
11433 if (c == '$' && pssyntax) {
11434 USTPUTC(CTLESC, out);
11435 USTPUTC('\\', out);
11438 /* Backslash is retained if we are in "str" and next char isn't special */
11443 && (c != '"' || eofmark != NULL)
11445 USTPUTC('\\', out);
11447 USTPUTC(CTLESC, out);
11455 if (eofmark == NULL) {
11456 USTPUTC(CTLQUOTEMARK, out);
11464 IF_ASH_BASH_COMPAT(bash_dollar_squote = 0;)
11465 if (eofmark != NULL && varnest == 0) {
11468 if (dqvarnest == 0) {
11469 syntax = BASESYNTAX;
11476 case CVAR: /* '$' */
11477 PARSESUB(); /* parse substitution */
11479 case CENDVAR: /* '}' */
11482 if (dqvarnest > 0) {
11489 #if ENABLE_SH_MATH_SUPPORT
11490 case CLP: /* '(' in arithmetic */
11494 case CRP: /* ')' in arithmetic */
11495 if (parenlevel > 0) {
11498 if (pgetc_eatbnl() == ')') {
11500 if (--arinest == 0) {
11501 syntax = prevsyntax;
11505 * unbalanced parens
11506 * (don't 2nd guess - no error)
11514 case CBQUOTE: /* '`' */
11518 goto endword; /* exit outer loop */
11522 if (varnest == 0) {
11523 #if ENABLE_ASH_BASH_COMPAT
11525 //Can't call pgetc_eatbnl() here, this requires three-deep pungetc()
11526 if (pgetc() == '>')
11527 c = 0x100 + '>'; /* flag &> */
11531 goto endword; /* exit outer loop */
11533 IF_ASH_ALIAS(if (c != PEOA))
11540 #if ENABLE_SH_MATH_SUPPORT
11541 if (syntax == ARISYNTAX)
11542 raise_error_syntax("missing '))'");
11544 if (syntax != BASESYNTAX && eofmark == NULL)
11545 raise_error_syntax("unterminated quoted string");
11546 if (varnest != 0) {
11547 startlinno = g_parsefile->linno;
11549 raise_error_syntax("missing '}'");
11551 USTPUTC('\0', out);
11552 len = out - (char *)stackblock();
11553 out = stackblock();
11554 if (eofmark == NULL) {
11555 if ((c == '>' || c == '<' IF_ASH_BASH_COMPAT( || c == 0x100 + '>'))
11558 if (isdigit_str9(out)) {
11559 PARSEREDIR(); /* passed as params: out, c */
11560 lasttoken = TREDIR;
11563 /* else: non-number X seen, interpret it
11564 * as "NNNX>file" = "NNNX >file" */
11568 quoteflag = quotef;
11569 backquotelist = bqlist;
11570 grabstackblock(len);
11574 /* end of readtoken routine */
11577 * Check to see whether we are at the end of the here document. When this
11578 * is called, c is set to the first character of the next input line. If
11579 * we are at the end of the here document, this routine sets the c to PEOF.
11583 #if ENABLE_ASH_ALIAS
11585 c = pgetc_without_PEOA();
11588 while (c == '\t') {
11589 c = pgetc_without_PEOA();
11592 if (c == *eofmark) {
11593 if (pfgets(line, sizeof(line)) != NULL) {
11598 for (q = eofmark + 1;; p++, q++) {
11602 if (!*q || cc != *q)
11609 pushstring(line, NULL);
11614 goto checkend_return;
11618 * Parse a redirection operator. The variable "out" points to a string
11619 * specifying the fd to be redirected. The variable "c" contains the
11620 * first character of the redirection operator.
11623 /* out is already checked to be a valid number or "" */
11624 int fd = (*out == '\0' ? -1 : atoi(out));
11627 np = stzalloc(sizeof(struct nfile));
11632 np->type = NAPPEND;
11634 np->type = NCLOBBER;
11637 /* it also can be NTO2 (>&file), but we can't figure it out yet */
11643 #if ENABLE_ASH_BASH_COMPAT
11644 else if (c == 0x100 + '>') { /* this flags &> redirection */
11646 pgetc(); /* this is '>', no need to check */
11650 else { /* c == '<' */
11651 /*np->nfile.fd = 0; - stzalloc did it */
11655 if (sizeof(struct nfile) != sizeof(struct nhere)) {
11656 np = stzalloc(sizeof(struct nhere));
11657 /*np->nfile.fd = 0; - stzalloc did it */
11660 heredoc = stzalloc(sizeof(struct heredoc));
11661 heredoc->here = np;
11664 heredoc->striptabs = 1;
11666 /*heredoc->striptabs = 0; - stzalloc did it */
11672 np->type = NFROMFD;
11676 np->type = NFROMTO;
11688 goto parseredir_return;
11692 * Parse a substitution. At this point, we have read the dollar sign
11693 * and nothing else.
11696 /* is_special(c) evaluates to 1 for c in "!#$*-0123456789?@"; 0 otherwise
11697 * (assuming ascii char codes, as the original implementation did) */
11698 #define is_special(c) \
11699 (((unsigned)(c) - 33 < 32) \
11700 && ((0xc1ff920dU >> ((unsigned)(c) - 33)) & 1))
11702 unsigned char subtype;
11705 c = pgetc_eatbnl();
11706 if (c > 255 /* PEOA or PEOF */
11707 || (c != '(' && c != '{' && !is_name(c) && !is_special(c))
11709 #if ENABLE_ASH_BASH_COMPAT
11710 if (syntax != DQSYNTAX && c == '\'')
11711 bash_dollar_squote = 1;
11716 } else if (c == '(') {
11717 /* $(command) or $((arith)) */
11718 if (pgetc_eatbnl() == '(') {
11719 #if ENABLE_SH_MATH_SUPPORT
11722 raise_error_syntax("you disabled math support for $((arith)) syntax");
11729 /* $VAR, $<specialchar>, ${...}, or PEOA/PEOF */
11730 USTPUTC(CTLVAR, out);
11731 typeloc = out - (char *)stackblock();
11733 subtype = VSNORMAL;
11735 c = pgetc_eatbnl();
11740 /* $[{[#]]NAME[}] */
11743 c = pgetc_eatbnl();
11744 } while (is_in_name(c));
11745 } else if (isdigit(c)) {
11746 /* $[{[#]]NUM[}] */
11749 c = pgetc_eatbnl();
11750 } while (isdigit(c));
11751 } else if (is_special(c)) {
11752 /* $[{[#]]<specialchar>[}] */
11755 c = pgetc_eatbnl();
11756 if (!subtype && cc == '#') {
11757 subtype = VSLENGTH;
11758 if (c == '_' || isalnum(c))
11761 c = pgetc_eatbnl();
11762 if (cc == '}' || c != '}') {
11773 if (c != '}' && subtype == VSLENGTH) {
11774 /* ${#VAR didn't end with } */
11778 if (subtype == 0) {
11779 static const char types[] ALIGN1 = "}-+?=";
11780 /* ${VAR...} but not $VAR or ${#VAR} */
11781 /* c == first char after VAR */
11784 c = pgetc_eatbnl();
11785 #if ENABLE_ASH_BASH_COMPAT
11786 /* This check is only needed to not misinterpret
11787 * ${VAR:-WORD}, ${VAR:+WORD}, ${VAR:=WORD}, ${VAR:?WORD}
11790 if (!strchr(types, c)) {
11791 subtype = VSSUBSTR;
11793 break; /* "goto badsub" is bigger (!) */
11799 const char *p = strchr(types, c);
11802 subtype |= p - types + VSNORMAL;
11808 subtype = (c == '#' ? VSTRIMLEFT : VSTRIMRIGHT);
11809 c = pgetc_eatbnl();
11815 #if ENABLE_ASH_BASH_COMPAT
11817 /* ${v/[/]pattern/repl} */
11818 //TODO: encode pattern and repl separately.
11819 // Currently ${v/$var_with_slash/repl} is horribly broken
11820 subtype = VSREPLACE;
11821 c = pgetc_eatbnl();
11824 subtype++; /* VSREPLACEALL */
11832 ((unsigned char *)stackblock())[typeloc] = subtype;
11833 if (subtype != VSNORMAL) {
11840 goto parsesub_return;
11844 * Called to parse command substitutions. Newstyle is set if the command
11845 * is enclosed inside $(...); nlpp is a pointer to the head of the linked
11846 * list of commands (passed by reference), and savelen is the number of
11847 * characters on the top of the stack which must be preserved.
11850 struct nodelist **nlpp;
11854 smallint saveprompt = 0;
11857 savelen = out - (char *)stackblock();
11860 * FIXME: this can allocate very large block on stack and SEGV.
11862 * echo "..<100kbytes>..`true` $(true) `true` ..."
11863 * allocates 100kb for every command subst. With about
11864 * a hundred command substitutions stack overflows.
11865 * With larger prepended string, SEGV happens sooner.
11867 str = alloca(savelen);
11868 memcpy(str, stackblock(), savelen);
11872 /* We must read until the closing backquote, giving special
11873 * treatment to some slashes, and then push the string and
11874 * reread it as input, interpreting it normally.
11880 STARTSTACKSTR(pout);
11884 setprompt_if(needprompt, 2);
11895 * If eating a newline, avoid putting
11896 * the newline into the new character
11897 * stream (via the STPUTC after the
11902 if (pc != '\\' && pc != '`' && pc != '$'
11903 && (!dblquote || pc != '"')
11905 STPUTC('\\', pout);
11907 if (pc <= 255 /* not PEOA or PEOF */) {
11913 IF_ASH_ALIAS(case PEOA:)
11914 startlinno = g_parsefile->linno;
11915 raise_error_syntax("EOF in backquote substitution");
11927 STPUTC('\0', pout);
11928 psavelen = pout - (char *)stackblock();
11929 if (psavelen > 0) {
11930 pstr = grabstackstr(pout);
11931 setinputstring(pstr);
11936 nlpp = &(*nlpp)->next;
11937 *nlpp = stzalloc(sizeof(**nlpp));
11938 /* (*nlpp)->next = NULL; - stzalloc did it */
11941 saveprompt = doprompt;
11948 doprompt = saveprompt;
11949 else if (readtoken() != TRP)
11950 raise_error_unexpected_syntax(TRP);
11955 * Start reading from old file again, ignoring any pushed back
11956 * tokens left from the backquote parsing
11961 while (stackblocksize() <= savelen)
11963 STARTSTACKSTR(out);
11965 memcpy(out, str, savelen);
11966 STADJUST(savelen, out);
11968 USTPUTC(CTLBACKQ, out);
11970 goto parsebackq_oldreturn;
11971 goto parsebackq_newreturn;
11974 #if ENABLE_SH_MATH_SUPPORT
11976 * Parse an arithmetic expansion (indicate start of one and set state)
11979 if (++arinest == 1) {
11980 prevsyntax = syntax;
11981 syntax = ARISYNTAX;
11983 USTPUTC(CTLARI, out);
11984 goto parsearith_return;
11987 } /* end of readtoken */
11990 * Read the next input token.
11991 * If the token is a word, we set backquotelist to the list of cmds in
11992 * backquotes. We set quoteflag to true if any part of the word was
11994 * If the token is TREDIR, then we set redirnode to a structure containing
11996 * In all cases, the variable startlinno is set to the number of the line
11997 * on which the token starts.
11999 * [Change comment: here documents and internal procedures]
12000 * [Readtoken shouldn't have any arguments. Perhaps we should make the
12001 * word parsing code into a separate routine. In this case, readtoken
12002 * doesn't need to have any internal procedures, but parseword does.
12003 * We could also make parseoperator in essence the main routine, and
12004 * have parseword (readtoken1?) handle both words and redirection.]
12006 #define NEW_xxreadtoken
12007 #ifdef NEW_xxreadtoken
12008 /* singles must be first! */
12009 static const char xxreadtoken_chars[7] ALIGN1 = {
12010 '\n', '(', ')', /* singles */
12011 '&', '|', ';', /* doubles */
12015 #define xxreadtoken_singles 3
12016 #define xxreadtoken_doubles 3
12018 static const char xxreadtoken_tokens[] ALIGN1 = {
12019 TNL, TLP, TRP, /* only single occurrence allowed */
12020 TBACKGND, TPIPE, TSEMI, /* if single occurrence */
12021 TEOF, /* corresponds to trailing nul */
12022 TAND, TOR, TENDCASE /* if double occurrence */
12034 setprompt_if(needprompt, 2);
12035 startlinno = g_parsefile->linno;
12036 for (;;) { /* until token or start of word found */
12038 if (c == ' ' || c == '\t' IF_ASH_ALIAS( || c == PEOA))
12042 while ((c = pgetc()) != '\n' && c != PEOF)
12045 } else if (c == '\\') {
12046 if (pgetc() != '\n') {
12048 break; /* return readtoken1(...) */
12054 p = xxreadtoken_chars + sizeof(xxreadtoken_chars) - 1;
12060 p = strchr(xxreadtoken_chars, c);
12062 break; /* return readtoken1(...) */
12064 if ((int)(p - xxreadtoken_chars) >= xxreadtoken_singles) {
12066 if (cc == c) { /* double occurrence? */
12067 p += xxreadtoken_doubles + 1;
12070 #if ENABLE_ASH_BASH_COMPAT
12071 if (c == '&' && cc == '>') /* &> */
12072 break; /* return readtoken1(...) */
12077 lasttoken = xxreadtoken_tokens[p - xxreadtoken_chars];
12082 return readtoken1(c, BASESYNTAX, (char *) NULL, 0);
12084 #else /* old xxreadtoken */
12085 #define RETURN(token) return lasttoken = token
12095 setprompt_if(needprompt, 2);
12096 startlinno = g_parsefile->linno;
12097 for (;;) { /* until token or start of word found */
12100 case ' ': case '\t':
12101 IF_ASH_ALIAS(case PEOA:)
12104 while ((c = pgetc()) != '\n' && c != PEOF)
12109 if (pgetc() == '\n') {
12121 if (pgetc() == '&')
12126 if (pgetc() == '|')
12131 if (pgetc() == ';')
12144 return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
12147 #endif /* old xxreadtoken */
12153 int kwd = checkkwd;
12155 smallint alreadyseen = tokpushback;
12158 #if ENABLE_ASH_ALIAS
12174 if (t != TWORD || quoteflag) {
12179 * check for keywords
12181 if (kwd & CHKKWD) {
12182 const char *const *pp;
12184 pp = findkwd(wordtext);
12186 lasttoken = t = pp - tokname_array;
12187 TRACE(("keyword '%s' recognized\n", tokname_array[t]));
12192 if (checkkwd & CHKALIAS) {
12193 #if ENABLE_ASH_ALIAS
12195 ap = lookupalias(wordtext, 1);
12198 pushstring(ap->val, ap);
12208 TRACE(("token '%s' %s\n", tokname_array[t], t == TWORD ? wordtext : ""));
12210 TRACE(("reread token '%s' %s\n", tokname_array[t], t == TWORD ? wordtext : ""));
12226 * Read and parse a command. Returns NODE_EOF on end of file.
12227 * (NULL is a valid parse tree indicating a blank line.)
12229 static union node *
12230 parsecmd(int interact)
12235 doprompt = interact;
12236 setprompt_if(doprompt, doprompt);
12242 * Input any here documents.
12247 struct heredoc *here;
12250 here = heredoclist;
12251 heredoclist = NULL;
12254 setprompt_if(needprompt, 2);
12255 readtoken1(pgetc(), here->here->type == NHERE ? SQSYNTAX : DQSYNTAX,
12256 here->eofmark, here->striptabs);
12257 n = stzalloc(sizeof(struct narg));
12258 n->narg.type = NARG;
12259 /*n->narg.next = NULL; - stzalloc did it */
12260 n->narg.text = wordtext;
12261 n->narg.backquote = backquotelist;
12262 here->here->nhere.doc = n;
12269 * called by editline -- any expansions to the prompt should be added here.
12271 #if ENABLE_ASH_EXPAND_PRMT
12272 static const char *
12273 expandstr(const char *ps)
12278 /* XXX Fix (char *) cast. It _is_ a bug. ps is variable's value,
12279 * and token processing _can_ alter it (delete NULs etc). */
12280 setinputstring((char *)ps);
12282 saveprompt = doprompt;
12284 readtoken1(pgetc(), PSSYNTAX, nullstr, 0);
12285 doprompt = saveprompt;
12289 n.narg.type = NARG;
12290 n.narg.next = NULL;
12291 n.narg.text = wordtext;
12292 n.narg.backquote = backquotelist;
12294 expandarg(&n, NULL, EXP_QUOTED);
12295 return stackblock();
12300 * Execute a command or commands contained in a string.
12303 evalstring(char *s, int flags)
12306 struct stackmark smark;
12311 setstackmark(&smark);
12314 while ((n = parsecmd(0)) != NODE_EOF) {
12317 i = evaltree(n, flags);
12320 popstackmark(&smark);
12324 popstackmark(&smark);
12332 * The eval command.
12334 static int FAST_FUNC
12335 evalcmd(int argc UNUSED_PARAM, char **argv, int flags)
12344 STARTSTACKSTR(concat);
12346 concat = stack_putstr(p, concat);
12350 STPUTC(' ', concat);
12352 STPUTC('\0', concat);
12353 p = grabstackstr(concat);
12355 return evalstring(p, flags & EV_TESTED);
12361 * Read and execute commands.
12362 * "Top" is nonzero for the top level command loop;
12363 * it turns on prompting if the shell is interactive.
12369 struct stackmark smark;
12374 TRACE(("cmdloop(%d) called\n", top));
12378 setstackmark(&smark);
12381 showjobs(SHOW_CHANGED|SHOW_STDERR);
12384 if (iflag && top) {
12388 n = parsecmd(inter);
12390 if (DEBUG > 2 && debug && (n != NODE_EOF))
12393 if (n == NODE_EOF) {
12394 if (!top || numeof >= 50)
12396 if (!stoppedjobs()) {
12399 out2str("\nUse \"exit\" to leave shell.\n");
12402 } else if (nflag == 0) {
12405 /* job_warning can only be 2,1,0. Here 2->1, 1/0->0 */
12408 i = evaltree(n, 0);
12412 popstackmark(&smark);
12416 evalskip &= ~SKIPFUNC;
12424 * Take commands from a file. To be compatible we should do a path
12425 * search for the file, which is necessary to find sub-commands.
12428 find_dot_file(char *name)
12431 const char *path = pathval();
12434 /* don't try this for absolute or relative paths */
12435 if (strchr(name, '/'))
12438 /* IIRC standards do not say whether . is to be searched.
12439 * And it is even smaller this way, making it unconditional for now:
12441 if (1) { /* ENABLE_ASH_BASH_COMPAT */
12446 while ((fullname = path_advance(&path, name)) != NULL) {
12448 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
12450 * Don't bother freeing here, since it will
12451 * be freed by the caller.
12455 if (fullname != name)
12456 stunalloc(fullname);
12459 /* not found in the PATH */
12460 ash_msg_and_raise_error("%s: not found", name);
12464 static int FAST_FUNC
12465 dotcmd(int argc_ UNUSED_PARAM, char **argv_ UNUSED_PARAM)
12467 /* "false; . empty_file; echo $?" should print 0, not 1: */
12471 struct strlist *sp;
12472 volatile struct shparam saveparam;
12474 for (sp = cmdenviron; sp; sp = sp->next)
12475 setvareq(ckstrdup(sp->text), VSTRFIXED | VTEXTFIXED);
12477 nextopt(nullstr); /* handle possible "--" */
12481 /* bash says: "bash: .: filename argument required" */
12482 return 2; /* bash compat */
12485 /* This aborts if file isn't found, which is POSIXly correct.
12486 * bash returns exitcode 1 instead.
12488 fullname = find_dot_file(argv[0]);
12490 if (argv[0]) { /* . FILE ARGS, ARGS exist */
12492 saveparam = shellparam;
12493 shellparam.malloced = 0;
12497 shellparam.nparam = argc;
12498 shellparam.p = argv;
12501 /* This aborts if file can't be opened, which is POSIXly correct.
12502 * bash returns exitcode 1 instead.
12504 setinputfile(fullname, INPUT_PUSH_FILE);
12505 commandname = fullname;
12506 status = cmdloop(0);
12510 freeparam(&shellparam);
12511 shellparam = saveparam;
12517 static int FAST_FUNC
12518 exitcmd(int argc UNUSED_PARAM, char **argv)
12523 exitstatus = number(argv[1]);
12524 raise_exception(EXEXIT);
12529 * Read a file containing shell functions.
12532 readcmdfile(char *name)
12534 setinputfile(name, INPUT_PUSH_FILE);
12540 /* ============ find_command inplementation */
12543 * Resolve a command name. If you change this routine, you may have to
12544 * change the shellexec routine as well.
12547 find_command(char *name, struct cmdentry *entry, int act, const char *path)
12549 struct tblentry *cmdp;
12556 struct builtincmd *bcmd;
12558 /* If name contains a slash, don't use PATH or hash table */
12559 if (strchr(name, '/') != NULL) {
12560 entry->u.index = -1;
12561 if (act & DO_ABS) {
12562 while (stat(name, &statb) < 0) {
12564 if (errno == EINTR)
12567 entry->cmdtype = CMDUNKNOWN;
12571 entry->cmdtype = CMDNORMAL;
12575 /* #if ENABLE_FEATURE_SH_STANDALONE... moved after builtin check */
12577 updatetbl = (path == pathval());
12580 if (strstr(path, "%builtin") != NULL)
12581 act |= DO_ALTBLTIN;
12584 /* If name is in the table, check answer will be ok */
12585 cmdp = cmdlookup(name, 0);
12586 if (cmdp != NULL) {
12589 switch (cmdp->cmdtype) {
12607 } else if (cmdp->rehash == 0)
12608 /* if not invalidated by cd, we're done */
12612 /* If %builtin not in path, check for builtin next */
12613 bcmd = find_builtin(name);
12615 if (IS_BUILTIN_REGULAR(bcmd))
12616 goto builtin_success;
12617 if (act & DO_ALTPATH) {
12618 if (!(act & DO_ALTBLTIN))
12619 goto builtin_success;
12620 } else if (builtinloc <= 0) {
12621 goto builtin_success;
12625 #if ENABLE_FEATURE_SH_STANDALONE
12627 int applet_no = find_applet_by_name(name);
12628 if (applet_no >= 0) {
12629 entry->cmdtype = CMDNORMAL;
12630 entry->u.index = -2 - applet_no;
12636 /* We have to search path. */
12637 prev = -1; /* where to start */
12638 if (cmdp && cmdp->rehash) { /* doing a rehash */
12639 if (cmdp->cmdtype == CMDBUILTIN)
12642 prev = cmdp->param.index;
12648 while ((fullname = path_advance(&path, name)) != NULL) {
12649 stunalloc(fullname);
12650 /* NB: code below will still use fullname
12651 * despite it being "unallocated" */
12654 if (prefix(pathopt, "builtin")) {
12656 goto builtin_success;
12659 if ((act & DO_NOFUNC)
12660 || !prefix(pathopt, "func")
12661 ) { /* ignore unimplemented options */
12665 /* if rehash, don't redo absolute path names */
12666 if (fullname[0] == '/' && idx <= prev) {
12669 TRACE(("searchexec \"%s\": no change\n", name));
12672 while (stat(fullname, &statb) < 0) {
12674 if (errno == EINTR)
12677 if (errno != ENOENT && errno != ENOTDIR)
12681 e = EACCES; /* if we fail, this will be the error */
12682 if (!S_ISREG(statb.st_mode))
12684 if (pathopt) { /* this is a %func directory */
12685 stalloc(strlen(fullname) + 1);
12686 /* NB: stalloc will return space pointed by fullname
12687 * (because we don't have any intervening allocations
12688 * between stunalloc above and this stalloc) */
12689 readcmdfile(fullname);
12690 cmdp = cmdlookup(name, 0);
12691 if (cmdp == NULL || cmdp->cmdtype != CMDFUNCTION)
12692 ash_msg_and_raise_error("%s not defined in %s", name, fullname);
12693 stunalloc(fullname);
12696 TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
12698 entry->cmdtype = CMDNORMAL;
12699 entry->u.index = idx;
12703 cmdp = cmdlookup(name, 1);
12704 cmdp->cmdtype = CMDNORMAL;
12705 cmdp->param.index = idx;
12710 /* We failed. If there was an entry for this command, delete it */
12711 if (cmdp && updatetbl)
12712 delete_cmd_entry();
12714 ash_msg("%s: %s", name, errmsg(e, "not found"));
12715 entry->cmdtype = CMDUNKNOWN;
12720 entry->cmdtype = CMDBUILTIN;
12721 entry->u.cmd = bcmd;
12725 cmdp = cmdlookup(name, 1);
12726 cmdp->cmdtype = CMDBUILTIN;
12727 cmdp->param.cmd = bcmd;
12731 entry->cmdtype = cmdp->cmdtype;
12732 entry->u = cmdp->param;
12737 * The trap builtin.
12739 static int FAST_FUNC
12740 trapcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12744 int signo, exitcode;
12749 for (signo = 0; signo < NSIG; signo++) {
12750 char *tr = trap_ptr[signo];
12752 /* note: bash adds "SIG", but only if invoked
12753 * as "bash". If called as "sh", or if set -o posix,
12754 * then it prints short signal names.
12755 * We are printing short names: */
12756 out1fmt("trap -- %s %s\n",
12758 get_signame(signo));
12759 /* trap_ptr != trap only if we are in special-cased `trap` code.
12760 * In this case, we will exit very soon, no need to free(). */
12761 /* if (trap_ptr != trap && tp[0]) */
12766 if (trap_ptr != trap) {
12779 signo = get_signum(*ap);
12781 /* Mimic bash message exactly */
12782 ash_msg("%s: invalid signal specification", *ap);
12788 if (LONE_DASH(action))
12791 action = ckstrdup(action);
12795 may_have_traps = 1;
12796 trap[signo] = action;
12807 /* ============ Builtins */
12809 #if ENABLE_ASH_HELP
12810 static int FAST_FUNC
12811 helpcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12817 "Built-in commands:\n"
12818 "------------------\n");
12819 for (col = 0, i = 0; i < ARRAY_SIZE(builtintab); i++) {
12820 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '),
12821 builtintab[i].name + 1);
12827 # if ENABLE_FEATURE_SH_STANDALONE
12829 const char *a = applet_names;
12831 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '), a);
12836 while (*a++ != '\0')
12841 newline_and_flush(stdout);
12842 return EXIT_SUCCESS;
12847 static int FAST_FUNC
12848 historycmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12850 show_history(line_input_state);
12851 return EXIT_SUCCESS;
12856 * The export and readonly commands.
12858 static int FAST_FUNC
12859 exportcmd(int argc UNUSED_PARAM, char **argv)
12869 /* "readonly" in bash accepts, but ignores -n.
12870 * We do the same: it saves a conditional in nextopt's param.
12873 while ((opt = nextopt("np")) != '\0') {
12875 flag_off = VEXPORT;
12878 if (argv[0][0] == 'r') {
12880 flag_off = 0; /* readonly ignores -n */
12882 flag_off = ~flag_off;
12884 /*if (opt_p_not_specified) - bash doesnt check this. Try "export -p NAME" */
12890 p = strchr(name, '=');
12894 vp = *findvar(hashvar(name), name);
12896 vp->flags = ((vp->flags | flag) & flag_off);
12900 setvar(name, p, (flag & flag_off));
12901 } while ((name = *++aptr) != NULL);
12906 /* No arguments. Show the list of exported or readonly vars.
12909 showvars(argv[0], flag, 0);
12914 * Delete a function if it exists.
12917 unsetfunc(const char *name)
12919 struct tblentry *cmdp;
12921 cmdp = cmdlookup(name, 0);
12922 if (cmdp != NULL && cmdp->cmdtype == CMDFUNCTION)
12923 delete_cmd_entry();
12927 * The unset builtin command. We unset the function before we unset the
12928 * variable to allow a function to be unset when there is a readonly variable
12929 * with the same name.
12931 static int FAST_FUNC
12932 unsetcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12939 while ((i = nextopt("vf")) != 0) {
12943 for (ap = argptr; *ap; ap++) {
12956 static const unsigned char timescmd_str[] ALIGN1 = {
12957 ' ', offsetof(struct tms, tms_utime),
12958 '\n', offsetof(struct tms, tms_stime),
12959 ' ', offsetof(struct tms, tms_cutime),
12960 '\n', offsetof(struct tms, tms_cstime),
12963 static int FAST_FUNC
12964 timescmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12966 unsigned long clk_tck, s, t;
12967 const unsigned char *p;
12970 clk_tck = bb_clk_tck();
12975 t = *(clock_t *)(((char *) &buf) + p[1]);
12978 out1fmt("%lum%lu.%03lus%c",
12980 (t * 1000) / clk_tck,
12988 #if ENABLE_SH_MATH_SUPPORT
12990 * The let builtin. Partially stolen from GNU Bash, the Bourne Again SHell.
12991 * Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
12993 * Copyright (C) 2003 Vladimir Oleynik <dzo@simtreas.ru>
12995 static int FAST_FUNC
12996 letcmd(int argc UNUSED_PARAM, char **argv)
13002 ash_msg_and_raise_error("expression expected");
13004 i = ash_arith(*argv);
13012 * The read builtin. Options:
13013 * -r Do not interpret '\' specially
13014 * -s Turn off echo (tty only)
13015 * -n NCHARS Read NCHARS max
13016 * -p PROMPT Display PROMPT on stderr (if input is from tty)
13017 * -t SECONDS Timeout after SECONDS (tty or pipe only)
13018 * -u FD Read from given FD instead of fd 0
13019 * This uses unbuffered input, which may be avoidable in some cases.
13020 * TODO: bash also has:
13021 * -a ARRAY Read into array[0],[1],etc
13022 * -d DELIM End on DELIM char, not newline
13023 * -e Use line editing (tty only)
13025 static int FAST_FUNC
13026 readcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
13028 char *opt_n = NULL;
13029 char *opt_p = NULL;
13030 char *opt_t = NULL;
13031 char *opt_u = NULL;
13032 int read_flags = 0;
13036 while ((i = nextopt("p:u:rt:n:s")) != '\0') {
13045 read_flags |= BUILTIN_READ_SILENT;
13051 read_flags |= BUILTIN_READ_RAW;
13061 /* "read -s" needs to save/restore termios, can't allow ^C
13062 * to jump out of it.
13065 r = shell_builtin_read(setvar0,
13067 bltinlookup("IFS"), /* can be NULL */
13076 if ((uintptr_t)r > 1)
13077 ash_msg_and_raise_error(r);
13079 return (uintptr_t)r;
13082 static int FAST_FUNC
13083 umaskcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
13085 static const char permuser[3] ALIGN1 = "ogu";
13088 int symbolic_mode = 0;
13090 while (nextopt("S") != '\0') {
13099 if (*argptr == NULL) {
13100 if (symbolic_mode) {
13101 char buf[sizeof(",u=rwx,g=rwx,o=rwx")];
13108 *p++ = permuser[i];
13110 /* mask is 0..0uuugggooo. i=2 selects uuu bits */
13111 if (!(mask & 0400)) *p++ = 'r';
13112 if (!(mask & 0200)) *p++ = 'w';
13113 if (!(mask & 0100)) *p++ = 'x';
13121 out1fmt("%04o\n", mask);
13124 char *modestr = *argptr;
13125 /* numeric umasks are taken as-is */
13126 /* symbolic umasks are inverted: "umask a=rx" calls umask(222) */
13127 if (!isdigit(modestr[0]))
13129 mask = bb_parse_mode(modestr, mask);
13130 if ((unsigned)mask > 0777) {
13131 ash_msg_and_raise_error("illegal mode: %s", modestr);
13133 if (!isdigit(modestr[0]))
13140 static int FAST_FUNC
13141 ulimitcmd(int argc UNUSED_PARAM, char **argv)
13143 return shell_builtin_ulimit(argv);
13146 /* ============ main() and helpers */
13149 * Called to exit the shell.
13158 #if ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
13159 save_history(line_input_state);
13161 status = exitstatus;
13162 TRACE(("pid %d, exitshell(%d)\n", getpid(), status));
13163 if (setjmp(loc.loc)) {
13164 if (exception_type == EXEXIT)
13165 status = exitstatus;
13168 exception_handler = &loc;
13174 /*free(p); - we'll exit soon */
13177 /* dash wraps setjobctl(0) in "if (setjmp(loc.loc) == 0) {...}".
13178 * our setjobctl(0) does not panic if tcsetpgrp fails inside it.
13181 flush_stdout_stderr();
13189 /* we will never free this */
13190 basepf.next_to_pgetc = basepf.buf = ckmalloc(IBUFSIZ);
13192 signal(SIGCHLD, SIG_DFL);
13193 /* bash re-enables SIGHUP which is SIG_IGNed on entry.
13194 * Try: "trap '' HUP; bash; echo RET" and type "kill -HUP $$"
13196 signal(SIGHUP, SIG_DFL);
13201 struct stat st1, st2;
13204 for (envp = environ; envp && *envp; envp++) {
13205 p = endofname(*envp);
13206 if (p != *envp && *p == '=') {
13207 setvareq(*envp, VEXPORT|VTEXTFIXED);
13211 setvareq((char*)defoptindvar, VTEXTFIXED);
13213 setvar0("PPID", utoa(getppid()));
13214 #if ENABLE_ASH_BASH_COMPAT
13215 p = lookupvar("SHLVL");
13216 setvar("SHLVL", utoa((p ? atoi(p) : 0) + 1), VEXPORT);
13217 if (!lookupvar("HOSTNAME")) {
13218 struct utsname uts;
13220 setvar0("HOSTNAME", uts.nodename);
13223 p = lookupvar("PWD");
13225 if (p[0] != '/' || stat(p, &st1) || stat(".", &st2)
13226 || st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino
13236 //usage:#define ash_trivial_usage
13237 //usage: "[-/+OPTIONS] [-/+o OPT]... [-c 'SCRIPT' [ARG0 [ARGS]] / FILE [ARGS]]"
13238 //usage:#define ash_full_usage "\n\n"
13239 //usage: "Unix shell interpreter"
13241 //usage:#if ENABLE_FEATURE_SH_IS_ASH
13242 //usage:# define sh_trivial_usage ash_trivial_usage
13243 //usage:# define sh_full_usage ash_full_usage
13245 //usage:#if ENABLE_FEATURE_BASH_IS_ASH
13246 //usage:# define bash_trivial_usage ash_trivial_usage
13247 //usage:# define bash_full_usage ash_full_usage
13251 * Process the shell command line arguments.
13254 procargs(char **argv)
13257 const char *xminusc;
13262 /* if (xargv[0]) - mmm, this is always true! */
13264 for (i = 0; i < NOPTS; i++)
13267 if (options(/*cmdline:*/ 1)) {
13268 /* it already printed err message */
13269 raise_exception(EXERROR);
13273 if (*xargv == NULL) {
13275 ash_msg_and_raise_error(bb_msg_requires_arg, "-c");
13278 if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
13282 for (i = 0; i < NOPTS; i++)
13283 if (optlist[i] == 2)
13288 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
13293 } else if (!sflag) {
13294 setinputfile(*xargv, 0);
13297 commandname = arg0;
13300 shellparam.p = xargv;
13301 #if ENABLE_ASH_GETOPTS
13302 shellparam.optind = 1;
13303 shellparam.optoff = -1;
13305 /* assert(shellparam.malloced == 0 && shellparam.nparam == 0); */
13307 shellparam.nparam++;
13314 * Read /etc/profile or .profile.
13317 read_profile(const char *name)
13319 if (setinputfile(name, INPUT_PUSH_FILE | INPUT_NOFILE_OK) < 0)
13326 * This routine is called when an error or an interrupt occurs in an
13327 * interactive shell and control is returned to the main command loop.
13335 /* from input.c: */
13336 g_parsefile->left_in_buffer = 0;
13337 g_parsefile->left_in_line = 0; /* clear input buffer */
13339 /* from parser.c: */
13342 /* from redir.c: */
13344 popredir(/*drop:*/ 0, /*restore:*/ 0);
13348 static short profile_buf[16384];
13349 extern int etext();
13353 * Main routine. We initialize things, parse the arguments, execute
13354 * profiles if we're a login shell, and then call cmdloop to execute
13355 * commands. The setjmp call sets up the location to jump to when an
13356 * exception occurs. When an exception occurs the variable "state"
13357 * is used to figure out how far we had gotten.
13359 int ash_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
13360 int ash_main(int argc UNUSED_PARAM, char **argv)
13362 const char *shinit;
13363 volatile smallint state;
13364 struct jmploc jmploc;
13365 struct stackmark smark;
13367 /* Initialize global data */
13371 #if ENABLE_ASH_ALIAS
13377 monitor(4, etext, profile_buf, sizeof(profile_buf), 50);
13380 #if ENABLE_FEATURE_EDITING
13381 line_input_state = new_line_input_t(FOR_SHELL | WITH_PATH_LOOKUP);
13384 if (setjmp(jmploc.loc)) {
13390 e = exception_type;
13392 if (e == EXEXIT || s == 0 || iflag == 0 || shlvl) {
13396 newline_and_flush(stderr);
13399 popstackmark(&smark);
13400 FORCE_INT_ON; /* enable interrupts */
13409 exception_handler = &jmploc;
13412 TRACE(("Shell args: "));
13413 trace_puts_args(argv);
13415 rootpid = getpid();
13418 setstackmark(&smark);
13421 if (argv[0] && argv[0][0] == '-')
13427 read_profile("/etc/profile");
13430 hp = lookupvar("HOME");
13432 hp = concat_path_file(hp, ".profile");
13441 getuid() == geteuid() && getgid() == getegid() &&
13445 shinit = lookupvar("ENV");
13446 if (shinit != NULL && *shinit != '\0') {
13447 read_profile(shinit);
13453 /* evalstring pushes parsefile stack.
13454 * Ensure we don't falsely claim that 0 (stdin)
13455 * is one of stacked source fds.
13456 * Testcase: ash -c 'exec 1>&0' must not complain. */
13457 // if (!sflag) g_parsefile->pf_fd = -1;
13458 // ^^ not necessary since now we special-case fd 0
13459 // in is_hidden_fd() to not be considered "hidden fd"
13460 evalstring(minusc, 0);
13463 if (sflag || minusc == NULL) {
13464 #if MAX_HISTORY > 0 && ENABLE_FEATURE_EDITING_SAVEHISTORY
13466 const char *hp = lookupvar("HISTFILE");
13468 hp = lookupvar("HOME");
13470 hp = concat_path_file(hp, ".ash_history");
13471 setvar0("HISTFILE", hp);
13473 hp = lookupvar("HISTFILE");
13477 line_input_state->hist_file = hp;
13478 # if ENABLE_FEATURE_SH_HISTFILESIZE
13479 hp = lookupvar("HISTFILESIZE");
13480 line_input_state->max_history = size_from_HISTFILESIZE(hp);
13484 state4: /* XXX ??? - why isn't this before the "if" statement */
13492 extern void _mcleanup(void);
13496 TRACE(("End of main reached\n"));
13503 * Copyright (c) 1989, 1991, 1993, 1994
13504 * The Regents of the University of California. All rights reserved.
13506 * This code is derived from software contributed to Berkeley by
13507 * Kenneth Almquist.
13509 * Redistribution and use in source and binary forms, with or without
13510 * modification, are permitted provided that the following conditions
13512 * 1. Redistributions of source code must retain the above copyright
13513 * notice, this list of conditions and the following disclaimer.
13514 * 2. Redistributions in binary form must reproduce the above copyright
13515 * notice, this list of conditions and the following disclaimer in the
13516 * documentation and/or other materials provided with the distribution.
13517 * 3. Neither the name of the University nor the names of its contributors
13518 * may be used to endorse or promote products derived from this software
13519 * without specific prior written permission.
13521 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
13522 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
13523 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
13524 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
13525 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
13526 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
13527 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
13528 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
13529 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
13530 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF