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 */
48 #include "shell_common.h"
49 #if ENABLE_SH_MATH_SUPPORT
52 #if ENABLE_ASH_RANDOM_SUPPORT
55 # define CLEAR_RANDOM_T(rnd) ((void)0)
58 #include "NUM_APPLETS.h"
60 /* STANDALONE does not make sense, and won't compile */
61 # undef CONFIG_FEATURE_SH_STANDALONE
62 # undef ENABLE_FEATURE_SH_STANDALONE
63 # undef IF_FEATURE_SH_STANDALONE
64 # undef IF_NOT_FEATURE_SH_STANDALONE
65 # define ENABLE_FEATURE_SH_STANDALONE 0
66 # define IF_FEATURE_SH_STANDALONE(...)
67 # define IF_NOT_FEATURE_SH_STANDALONE(...) __VA_ARGS__
71 # define PIPE_BUF 4096 /* amount of buffering in a pipe */
75 # error "Do not even bother, ash will not run on NOMMU machine"
81 //config: depends on !NOMMU
83 //config: Tha 'ash' shell adds about 60k in the default configuration and is
84 //config: the most complete and most pedantically correct shell included with
85 //config: busybox. This shell is actually a derivative of the Debian 'dash'
86 //config: shell (by Herbert Xu), which was created by porting the 'ash' shell
87 //config: (written by Kenneth Almquist) from NetBSD.
89 //config:config ASH_BASH_COMPAT
90 //config: bool "bash-compatible extensions"
92 //config: depends on ASH
94 //config: Enable bash-compatible extensions.
96 //config:config ASH_IDLE_TIMEOUT
97 //config: bool "Idle timeout variable"
99 //config: depends on ASH
101 //config: Enables bash-like auto-logout after $TMOUT seconds of idle time.
103 //config:config ASH_JOB_CONTROL
104 //config: bool "Job control"
106 //config: depends on ASH
108 //config: Enable job control in the ash shell.
110 //config:config ASH_ALIAS
111 //config: bool "Alias support"
113 //config: depends on ASH
115 //config: Enable alias support in the ash shell.
117 //config:config ASH_GETOPTS
118 //config: bool "Builtin getopt to parse positional parameters"
120 //config: depends on ASH
122 //config: Enable support for getopts builtin in ash.
124 //config:config ASH_BUILTIN_ECHO
125 //config: bool "Builtin version of 'echo'"
127 //config: depends on ASH
129 //config: Enable support for echo builtin in ash.
131 //config:config ASH_BUILTIN_PRINTF
132 //config: bool "Builtin version of 'printf'"
134 //config: depends on ASH
136 //config: Enable support for printf builtin in ash.
138 //config:config ASH_BUILTIN_TEST
139 //config: bool "Builtin version of 'test'"
141 //config: depends on ASH
143 //config: Enable support for test builtin in ash.
145 //config:config ASH_HELP
146 //config: bool "help builtin"
148 //config: depends on ASH
150 //config: Enable help builtin in ash.
152 //config:config ASH_CMDCMD
153 //config: bool "'command' command to override shell builtins"
155 //config: depends on ASH
157 //config: Enable support for the ash 'command' builtin, which allows
158 //config: you to run the specified command with the specified arguments,
159 //config: even when there is an ash builtin command with the same name.
161 //config:config ASH_MAIL
162 //config: bool "Check for new mail on interactive shells"
164 //config: depends on ASH
166 //config: Enable "check for new mail" function in the ash shell.
168 //config:config ASH_OPTIMIZE_FOR_SIZE
169 //config: bool "Optimize for size instead of speed"
171 //config: depends on ASH
173 //config: Compile ash for reduced size at the price of speed.
175 //config:config ASH_RANDOM_SUPPORT
176 //config: bool "Pseudorandom generator and $RANDOM variable"
178 //config: depends on ASH
180 //config: Enable pseudorandom generator and dynamic variable "$RANDOM".
181 //config: Each read of "$RANDOM" will generate a new pseudorandom value.
182 //config: You can reset the generator by using a specified start value.
183 //config: After "unset RANDOM" the generator will switch off and this
184 //config: variable will no longer have special treatment.
186 //config:config ASH_EXPAND_PRMT
187 //config: bool "Expand prompt string"
189 //config: depends on ASH
191 //config: "PS#" may contain volatile content, such as backquote commands.
192 //config: This option recreates the prompt string from the environment
193 //config: variable each time it is displayed.
196 //applet:IF_ASH(APPLET(ash, BB_DIR_BIN, BB_SUID_DROP))
197 //applet:IF_FEATURE_SH_IS_ASH(APPLET_ODDNAME(sh, ash, BB_DIR_BIN, BB_SUID_DROP, sh))
198 //applet:IF_FEATURE_BASH_IS_ASH(APPLET_ODDNAME(bash, ash, BB_DIR_BIN, BB_SUID_DROP, bash))
200 //kbuild:lib-$(CONFIG_ASH) += ash.o ash_ptr_hack.o shell_common.o
201 //kbuild:lib-$(CONFIG_ASH_RANDOM_SUPPORT) += random.o
204 /* ============ Hash table sizes. Configurable. */
208 #define CMDTABLESIZE 31 /* should be prime */
211 /* ============ Shell options */
213 static const char *const optletters_optnames[] = {
228 #if ENABLE_ASH_BASH_COMPAT
237 #define optletters(n) optletters_optnames[n][0]
238 #define optnames(n) (optletters_optnames[n] + 1)
240 enum { NOPTS = ARRAY_SIZE(optletters_optnames) };
243 /* ============ Misc data */
245 #define msg_illnum "Illegal number: %s"
248 * We enclose jmp_buf in a structure so that we can declare pointers to
249 * jump locations. The global variable handler contains the location to
250 * jump to when an exception occurs, and the global variable exception_type
251 * contains a code identifying the exception. To implement nested
252 * exception handlers, the user should save the value of handler on entry
253 * to an inner scope, set handler to point to a jmploc structure for the
254 * inner scope, and restore handler on exit from the scope.
260 struct globals_misc {
261 /* pid of main shell */
263 /* shell level: 0 for the main shell, 1 for its children, and so on */
265 #define rootshell (!shlvl)
266 char *minusc; /* argument to -c option */
268 char *curdir; // = nullstr; /* current working directory */
269 char *physdir; // = nullstr; /* physical working directory */
271 char *arg0; /* value of $0 */
273 struct jmploc *exception_handler;
275 volatile int suppress_int; /* counter */
276 volatile /*sig_atomic_t*/ smallint pending_int; /* 1 = got SIGINT */
277 /* last pending signal */
278 volatile /*sig_atomic_t*/ smallint pending_sig;
279 smallint exception_type; /* kind of exception (0..5) */
281 #define EXINT 0 /* SIGINT received */
282 #define EXERROR 1 /* a generic error */
283 #define EXSHELLPROC 2 /* execute a shell procedure */
284 #define EXEXEC 3 /* command execution failed */
285 #define EXEXIT 4 /* exit the shell */
286 #define EXSIG 5 /* trapped signal in wait(1) */
289 char nullstr[1]; /* zero length string */
292 #define eflag optlist[0]
293 #define fflag optlist[1]
294 #define Iflag optlist[2]
295 #define iflag optlist[3]
296 #define mflag optlist[4]
297 #define nflag optlist[5]
298 #define sflag optlist[6]
299 #define xflag optlist[7]
300 #define vflag optlist[8]
301 #define Cflag optlist[9]
302 #define aflag optlist[10]
303 #define bflag optlist[11]
304 #define uflag optlist[12]
305 #define viflag optlist[13]
306 #if ENABLE_ASH_BASH_COMPAT
307 # define pipefail optlist[14]
312 # define nolog optlist[14 + ENABLE_ASH_BASH_COMPAT]
313 # define debug optlist[15 + ENABLE_ASH_BASH_COMPAT]
316 /* trap handler commands */
318 * Sigmode records the current value of the signal handlers for the various
319 * modes. A value of zero means that the current handler is not known.
320 * S_HARD_IGN indicates that the signal was ignored on entry to the shell.
322 char sigmode[NSIG - 1];
323 #define S_DFL 1 /* default signal handling (SIG_DFL) */
324 #define S_CATCH 2 /* signal is caught */
325 #define S_IGN 3 /* signal is ignored (SIG_IGN) */
326 #define S_HARD_IGN 4 /* signal is ignored permanently */
328 /* indicates specified signal received */
329 uint8_t gotsig[NSIG - 1]; /* offset by 1: "signal" 0 is meaningless */
330 uint8_t may_have_traps; /* 0: definitely no traps are set, 1: some traps may be set */
332 char **trap_ptr; /* used only by "trap hack" */
334 /* Rarely referenced stuff */
335 #if ENABLE_ASH_RANDOM_SUPPORT
338 pid_t backgndpid; /* pid of last background process */
339 smallint job_warning; /* user was warned about stopped jobs (can be 2, 1 or 0). */
341 extern struct globals_misc *const ash_ptr_to_globals_misc;
342 #define G_misc (*ash_ptr_to_globals_misc)
343 #define rootpid (G_misc.rootpid )
344 #define shlvl (G_misc.shlvl )
345 #define minusc (G_misc.minusc )
346 #define curdir (G_misc.curdir )
347 #define physdir (G_misc.physdir )
348 #define arg0 (G_misc.arg0 )
349 #define exception_handler (G_misc.exception_handler)
350 #define exception_type (G_misc.exception_type )
351 #define suppress_int (G_misc.suppress_int )
352 #define pending_int (G_misc.pending_int )
353 #define pending_sig (G_misc.pending_sig )
354 #define isloginsh (G_misc.isloginsh )
355 #define nullstr (G_misc.nullstr )
356 #define optlist (G_misc.optlist )
357 #define sigmode (G_misc.sigmode )
358 #define gotsig (G_misc.gotsig )
359 #define may_have_traps (G_misc.may_have_traps )
360 #define trap (G_misc.trap )
361 #define trap_ptr (G_misc.trap_ptr )
362 #define random_gen (G_misc.random_gen )
363 #define backgndpid (G_misc.backgndpid )
364 #define job_warning (G_misc.job_warning)
365 #define INIT_G_misc() do { \
366 (*(struct globals_misc**)&ash_ptr_to_globals_misc) = xzalloc(sizeof(G_misc)); \
374 /* ============ DEBUG */
376 static void trace_printf(const char *fmt, ...);
377 static void trace_vprintf(const char *fmt, va_list va);
378 # define TRACE(param) trace_printf param
379 # define TRACEV(param) trace_vprintf param
380 # define close(fd) do { \
382 if (close(dfd) < 0) \
383 bb_error_msg("bug on %d: closing %d(0x%x)", \
384 __LINE__, dfd, dfd); \
387 # define TRACE(param)
388 # define TRACEV(param)
392 /* ============ Utility functions */
393 #define xbarrier() do { __asm__ __volatile__ ("": : :"memory"); } while (0)
395 #define is_name(c) ((c) == '_' || isalpha((unsigned char)(c)))
396 #define is_in_name(c) ((c) == '_' || isalnum((unsigned char)(c)))
398 static int isdigit_str9(const char *str)
400 int maxlen = 9 + 1; /* max 9 digits: 999999999 */
401 while (--maxlen && isdigit(*str))
403 return (*str == '\0');
406 static const char *var_end(const char *var)
415 /* ============ Interrupts / exceptions */
417 static void exitshell(void) NORETURN;
420 * These macros allow the user to suspend the handling of interrupt signals
421 * over a period of time. This is similar to SIGHOLD or to sigblock, but
422 * much more efficient and portable. (But hacking the kernel is so much
423 * more fun than worrying about efficiency and portability. :-))
425 #define INT_OFF do { \
431 * Called to raise an exception. Since C doesn't include exceptions, we
432 * just do a longjmp to the exception handler. The type of exception is
433 * stored in the global variable "exception_type".
435 static void raise_exception(int) NORETURN;
437 raise_exception(int e)
440 if (exception_handler == NULL)
445 longjmp(exception_handler->loc, 1);
448 #define raise_exception(e) do { \
449 TRACE(("raising exception %d on line %d\n", (e), __LINE__)); \
450 raise_exception(e); \
455 * Called from trap.c when a SIGINT is received. (If the user specifies
456 * that SIGINT is to be trapped or ignored using the trap builtin, then
457 * this routine is not called.) Suppressint is nonzero when interrupts
458 * are held using the INT_OFF macro. (The test for iflag is just
459 * defensive programming.)
461 static void raise_interrupt(void) NORETURN;
463 raise_interrupt(void)
468 /* Signal is not automatically unmasked after it is raised,
469 * do it ourself - unmask all signals */
470 sigprocmask_allsigs(SIG_UNBLOCK);
471 /* pending_sig = 0; - now done in signal_handler() */
474 if (gotsig[SIGINT - 1] && !trap[SIGINT]) {
475 if (!(rootshell && iflag)) {
476 /* Kill ourself with SIGINT */
477 signal(SIGINT, SIG_DFL);
482 raise_exception(ex_type);
486 #define raise_interrupt() do { \
487 TRACE(("raising interrupt on line %d\n", __LINE__)); \
492 static IF_ASH_OPTIMIZE_FOR_SIZE(inline) void
496 if (--suppress_int == 0 && pending_int) {
500 #define INT_ON int_on()
501 static IF_ASH_OPTIMIZE_FOR_SIZE(inline) void
509 #define FORCE_INT_ON force_int_on()
511 #define SAVE_INT(v) ((v) = suppress_int)
513 #define RESTORE_INT(v) do { \
515 suppress_int = (v); \
516 if (suppress_int == 0 && pending_int) \
521 /* ============ Stdout/stderr output */
524 outstr(const char *p, FILE *file)
532 flush_stdout_stderr(void)
539 /* Was called outcslow(c,FILE*), but c was always '\n' */
541 newline_and_flush(FILE *dest)
549 static int out1fmt(const char *, ...) __attribute__((__format__(__printf__,1,2)));
551 out1fmt(const char *fmt, ...)
558 r = vprintf(fmt, ap);
564 static int fmtstr(char *, size_t, const char *, ...) __attribute__((__format__(__printf__,3,4)));
566 fmtstr(char *outbuf, size_t length, const char *fmt, ...)
573 ret = vsnprintf(outbuf, length, fmt, ap);
580 out1str(const char *p)
586 out2str(const char *p)
589 flush_stdout_stderr();
593 /* ============ Parser structures */
595 /* control characters in argument strings */
596 #define CTL_FIRST CTLESC
597 #define CTLESC ((unsigned char)'\201') /* escape next character */
598 #define CTLVAR ((unsigned char)'\202') /* variable defn */
599 #define CTLENDVAR ((unsigned char)'\203')
600 #define CTLBACKQ ((unsigned char)'\204')
601 #define CTLARI ((unsigned char)'\206') /* arithmetic expression */
602 #define CTLENDARI ((unsigned char)'\207')
603 #define CTLQUOTEMARK ((unsigned char)'\210')
604 #define CTL_LAST CTLQUOTEMARK
606 /* variable substitution byte (follows CTLVAR) */
607 #define VSTYPE 0x0f /* type of variable substitution */
608 #define VSNUL 0x10 /* colon--treat the empty string as unset */
610 /* values of VSTYPE field */
611 #define VSNORMAL 0x1 /* normal variable: $var or ${var} */
612 #define VSMINUS 0x2 /* ${var-text} */
613 #define VSPLUS 0x3 /* ${var+text} */
614 #define VSQUESTION 0x4 /* ${var?message} */
615 #define VSASSIGN 0x5 /* ${var=text} */
616 #define VSTRIMRIGHT 0x6 /* ${var%pattern} */
617 #define VSTRIMRIGHTMAX 0x7 /* ${var%%pattern} */
618 #define VSTRIMLEFT 0x8 /* ${var#pattern} */
619 #define VSTRIMLEFTMAX 0x9 /* ${var##pattern} */
620 #define VSLENGTH 0xa /* ${#var} */
621 #if ENABLE_ASH_BASH_COMPAT
622 #define VSSUBSTR 0xc /* ${var:position:length} */
623 #define VSREPLACE 0xd /* ${var/pattern/replacement} */
624 #define VSREPLACEALL 0xe /* ${var//pattern/replacement} */
627 static const char dolatstr[] ALIGN1 = {
628 CTLQUOTEMARK, CTLVAR, VSNORMAL, '@', '=', CTLQUOTEMARK, '\0'
630 #define DOLATSTRLEN 6
649 #if ENABLE_ASH_BASH_COMPAT
666 smallint type; /* Nxxxx */
669 union node *redirect;
674 smallint pipe_backgnd;
675 struct nodelist *cmdlist;
681 union node *redirect;
694 union node *elsepart;
721 struct nodelist *backquote;
724 /* nfile and ndup layout must match!
725 * NTOFD (>&fdnum) uses ndup structure, but we may discover mid-flight
726 * that it is actually NTO2 (>&file), and change its type.
743 char *_unused_expfname;
762 struct nredir nredir;
763 struct nbinary nbinary;
767 struct nclist nclist;
776 * NODE_EOF is returned by parsecmd when it encounters an end of file.
777 * It must be distinct from NULL.
779 #define NODE_EOF ((union node *) -1L)
782 struct nodelist *next;
795 freefunc(struct funcnode *f)
797 if (f && --f->count < 0)
802 /* ============ Debugging output */
806 static FILE *tracefile;
809 trace_printf(const char *fmt, ...)
816 fprintf(tracefile, "%u ", (int) time(NULL));
818 fprintf(tracefile, "[%u] ", (int) getpid());
820 fprintf(tracefile, "pending s:%d i:%d(supp:%d) ", pending_sig, pending_int, suppress_int);
822 vfprintf(tracefile, fmt, va);
827 trace_vprintf(const char *fmt, va_list va)
832 fprintf(tracefile, "%u ", (int) time(NULL));
834 fprintf(tracefile, "[%u] ", (int) getpid());
836 fprintf(tracefile, "pending s:%d i:%d(supp:%d) ", pending_sig, pending_int, suppress_int);
837 vfprintf(tracefile, fmt, va);
841 trace_puts(const char *s)
849 trace_puts_quoted(char *s)
856 putc('"', tracefile);
857 for (p = s; *p; p++) {
858 switch ((unsigned char)*p) {
859 case '\n': c = 'n'; goto backslash;
860 case '\t': c = 't'; goto backslash;
861 case '\r': c = 'r'; goto backslash;
862 case '\"': c = '\"'; goto backslash;
863 case '\\': c = '\\'; goto backslash;
864 case CTLESC: c = 'e'; goto backslash;
865 case CTLVAR: c = 'v'; goto backslash;
866 case CTLBACKQ: c = 'q'; goto backslash;
868 putc('\\', tracefile);
872 if (*p >= ' ' && *p <= '~')
875 putc('\\', tracefile);
876 putc((*p >> 6) & 03, tracefile);
877 putc((*p >> 3) & 07, tracefile);
878 putc(*p & 07, tracefile);
883 putc('"', tracefile);
887 trace_puts_args(char **ap)
894 trace_puts_quoted(*ap);
896 putc('\n', tracefile);
899 putc(' ', tracefile);
914 /* leave open because libedit might be using it */
917 strcpy(s, "./trace");
919 if (!freopen(s, "a", tracefile)) {
920 fprintf(stderr, "Can't re-open %s\n", s);
925 tracefile = fopen(s, "a");
926 if (tracefile == NULL) {
927 fprintf(stderr, "Can't open %s\n", s);
933 flags = fcntl(fileno(tracefile), F_GETFL);
935 fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND);
937 setlinebuf(tracefile);
938 fputs("\nTracing started.\n", tracefile);
942 indent(int amount, char *pfx, FILE *fp)
946 for (i = 0; i < amount; i++) {
947 if (pfx && i == amount - 1)
953 /* little circular references here... */
954 static void shtree(union node *n, int ind, char *pfx, FILE *fp);
957 sharg(union node *arg, FILE *fp)
960 struct nodelist *bqlist;
961 unsigned char subtype;
963 if (arg->type != NARG) {
964 out1fmt("<node type %d>\n", arg->type);
967 bqlist = arg->narg.backquote;
968 for (p = arg->narg.text; *p; p++) {
969 switch ((unsigned char)*p) {
978 if (subtype == VSLENGTH)
989 switch (subtype & VSTYPE) {
1015 case VSTRIMRIGHTMAX:
1022 out1fmt("<subtype %d>", subtype);
1031 shtree(bqlist->n, -1, NULL, fp);
1042 shcmd(union node *cmd, FILE *fp)
1050 for (np = cmd->ncmd.args; np; np = np->narg.next) {
1056 for (np = cmd->ncmd.redirect; np; np = np->nfile.next) {
1060 switch (np->nfile.type) {
1061 case NTO: s = ">>"+1; dftfd = 1; break;
1062 case NCLOBBER: s = ">|"; dftfd = 1; break;
1063 case NAPPEND: s = ">>"; dftfd = 1; break;
1064 #if ENABLE_ASH_BASH_COMPAT
1067 case NTOFD: s = ">&"; dftfd = 1; break;
1068 case NFROM: s = "<"; break;
1069 case NFROMFD: s = "<&"; break;
1070 case NFROMTO: s = "<>"; break;
1071 default: s = "*error*"; break;
1073 if (np->nfile.fd != dftfd)
1074 fprintf(fp, "%d", np->nfile.fd);
1076 if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) {
1077 fprintf(fp, "%d", np->ndup.dupfd);
1079 sharg(np->nfile.fname, fp);
1086 shtree(union node *n, int ind, char *pfx, FILE *fp)
1088 struct nodelist *lp;
1094 indent(ind, pfx, fp);
1096 if (n == NODE_EOF) {
1111 shtree(n->nbinary.ch1, ind, NULL, fp);
1114 shtree(n->nbinary.ch2, ind, NULL, fp);
1122 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
1123 shtree(lp->n, 0, NULL, fp);
1127 if (n->npipe.pipe_backgnd)
1133 fprintf(fp, "<node type %d>", n->type);
1141 showtree(union node *n)
1143 trace_puts("showtree called\n");
1144 shtree(n, 1, NULL, stderr);
1150 /* ============ Parser data */
1153 * ash_vmsg() needs parsefile->fd, hence parsefile definition is moved up.
1156 struct strlist *next;
1163 struct strpush *prev; /* preceding string on stack */
1165 int prev_left_in_line;
1166 #if ENABLE_ASH_ALIAS
1167 struct alias *ap; /* if push was associated with an alias */
1169 char *string; /* remember the string since it may change */
1173 struct parsefile *prev; /* preceding file on stack */
1174 int linno; /* current line */
1175 int pf_fd; /* file descriptor (or -1 if string) */
1176 int left_in_line; /* number of chars left in this line */
1177 int left_in_buffer; /* number of chars left in this buffer past the line */
1178 char *next_to_pgetc; /* next char in buffer */
1179 char *buf; /* input buffer */
1180 struct strpush *strpush; /* for pushing strings at this level */
1181 struct strpush basestrpush; /* so pushing one is fast */
1184 static struct parsefile basepf; /* top level input file */
1185 static struct parsefile *g_parsefile = &basepf; /* current input file */
1186 static int startlinno; /* line # where last token started */
1187 static char *commandname; /* currently executing command */
1188 static struct strlist *cmdenviron; /* environment for builtin command */
1189 static uint8_t exitstatus; /* exit status of last command */
1192 /* ============ Message printing */
1195 ash_vmsg(const char *msg, va_list ap)
1197 fprintf(stderr, "%s: ", arg0);
1199 if (strcmp(arg0, commandname))
1200 fprintf(stderr, "%s: ", commandname);
1201 if (!iflag || g_parsefile->pf_fd > 0)
1202 fprintf(stderr, "line %d: ", startlinno);
1204 vfprintf(stderr, msg, ap);
1205 newline_and_flush(stderr);
1209 * Exverror is called to raise the error exception. If the second argument
1210 * is not NULL then error prints an error message using printf style
1211 * formatting. It then raises the error exception.
1213 static void ash_vmsg_and_raise(int, const char *, va_list) NORETURN;
1215 ash_vmsg_and_raise(int cond, const char *msg, va_list ap)
1219 TRACE(("ash_vmsg_and_raise(%d, \"", cond));
1221 TRACE(("\") pid=%d\n", getpid()));
1223 TRACE(("ash_vmsg_and_raise(%d, NULL) pid=%d\n", cond, getpid()));
1228 flush_stdout_stderr();
1229 raise_exception(cond);
1233 static void ash_msg_and_raise_error(const char *, ...) NORETURN;
1235 ash_msg_and_raise_error(const char *msg, ...)
1240 ash_vmsg_and_raise(EXERROR, msg, ap);
1245 static void raise_error_syntax(const char *) NORETURN;
1247 raise_error_syntax(const char *msg)
1249 ash_msg_and_raise_error("syntax error: %s", msg);
1253 static void ash_msg_and_raise(int, const char *, ...) NORETURN;
1255 ash_msg_and_raise(int cond, const char *msg, ...)
1260 ash_vmsg_and_raise(cond, msg, ap);
1266 * error/warning routines for external builtins
1269 ash_msg(const char *fmt, ...)
1279 * Return a string describing an error. The returned string may be a
1280 * pointer to a static buffer that will be overwritten on the next call.
1281 * Action describes the operation that got the error.
1284 errmsg(int e, const char *em)
1286 if (e == ENOENT || e == ENOTDIR) {
1293 /* ============ Memory allocation */
1296 /* I consider these wrappers nearly useless:
1297 * ok, they return you to nearest exception handler, but
1298 * how much memory do you leak in the process, making
1299 * memory starvation worse?
1302 ckrealloc(void * p, size_t nbytes)
1304 p = realloc(p, nbytes);
1306 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1311 ckmalloc(size_t nbytes)
1313 return ckrealloc(NULL, nbytes);
1317 ckzalloc(size_t nbytes)
1319 return memset(ckmalloc(nbytes), 0, nbytes);
1323 ckstrdup(const char *s)
1325 char *p = strdup(s);
1327 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1331 /* Using bbox equivalents. They exit if out of memory */
1332 # define ckrealloc xrealloc
1333 # define ckmalloc xmalloc
1334 # define ckzalloc xzalloc
1335 # define ckstrdup xstrdup
1339 * It appears that grabstackstr() will barf with such alignments
1340 * because stalloc() will return a string allocated in a new stackblock.
1342 #define SHELL_ALIGN(nbytes) (((nbytes) + SHELL_SIZE) & ~SHELL_SIZE)
1344 /* Most machines require the value returned from malloc to be aligned
1345 * in some way. The following macro will get this right
1346 * on many machines. */
1347 SHELL_SIZE = sizeof(union { int i; char *cp; double d; }) - 1,
1348 /* Minimum size of a block */
1349 MINSIZE = SHELL_ALIGN(504),
1352 struct stack_block {
1353 struct stack_block *prev;
1354 char space[MINSIZE];
1358 struct stack_block *stackp;
1361 struct stackmark *marknext;
1365 struct globals_memstack {
1366 struct stack_block *g_stackp; // = &stackbase;
1367 struct stackmark *markp;
1368 char *g_stacknxt; // = stackbase.space;
1369 char *sstrend; // = stackbase.space + MINSIZE;
1370 size_t g_stacknleft; // = MINSIZE;
1371 int herefd; // = -1;
1372 struct stack_block stackbase;
1374 extern struct globals_memstack *const ash_ptr_to_globals_memstack;
1375 #define G_memstack (*ash_ptr_to_globals_memstack)
1376 #define g_stackp (G_memstack.g_stackp )
1377 #define markp (G_memstack.markp )
1378 #define g_stacknxt (G_memstack.g_stacknxt )
1379 #define sstrend (G_memstack.sstrend )
1380 #define g_stacknleft (G_memstack.g_stacknleft)
1381 #define herefd (G_memstack.herefd )
1382 #define stackbase (G_memstack.stackbase )
1383 #define INIT_G_memstack() do { \
1384 (*(struct globals_memstack**)&ash_ptr_to_globals_memstack) = xzalloc(sizeof(G_memstack)); \
1386 g_stackp = &stackbase; \
1387 g_stacknxt = stackbase.space; \
1388 g_stacknleft = MINSIZE; \
1389 sstrend = stackbase.space + MINSIZE; \
1394 #define stackblock() ((void *)g_stacknxt)
1395 #define stackblocksize() g_stacknleft
1398 * Parse trees for commands are allocated in lifo order, so we use a stack
1399 * to make this more efficient, and also to avoid all sorts of exception
1400 * handling code to handle interrupts in the middle of a parse.
1402 * The size 504 was chosen because the Ultrix malloc handles that size
1406 stalloc(size_t nbytes)
1411 aligned = SHELL_ALIGN(nbytes);
1412 if (aligned > g_stacknleft) {
1415 struct stack_block *sp;
1417 blocksize = aligned;
1418 if (blocksize < MINSIZE)
1419 blocksize = MINSIZE;
1420 len = sizeof(struct stack_block) - MINSIZE + blocksize;
1421 if (len < blocksize)
1422 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1425 sp->prev = g_stackp;
1426 g_stacknxt = sp->space;
1427 g_stacknleft = blocksize;
1428 sstrend = g_stacknxt + blocksize;
1433 g_stacknxt += aligned;
1434 g_stacknleft -= aligned;
1439 stzalloc(size_t nbytes)
1441 return memset(stalloc(nbytes), 0, nbytes);
1448 if (!p || (g_stacknxt < (char *)p) || ((char *)p < g_stackp->space)) {
1449 write(STDERR_FILENO, "stunalloc\n", 10);
1453 g_stacknleft += g_stacknxt - (char *)p;
1458 * Like strdup but works with the ash stack.
1461 ststrdup(const char *p)
1463 size_t len = strlen(p) + 1;
1464 return memcpy(stalloc(len), p, len);
1468 setstackmark(struct stackmark *mark)
1470 mark->stackp = g_stackp;
1471 mark->stacknxt = g_stacknxt;
1472 mark->stacknleft = g_stacknleft;
1473 mark->marknext = markp;
1478 popstackmark(struct stackmark *mark)
1480 struct stack_block *sp;
1486 markp = mark->marknext;
1487 while (g_stackp != mark->stackp) {
1489 g_stackp = sp->prev;
1492 g_stacknxt = mark->stacknxt;
1493 g_stacknleft = mark->stacknleft;
1494 sstrend = mark->stacknxt + mark->stacknleft;
1499 * When the parser reads in a string, it wants to stick the string on the
1500 * stack and only adjust the stack pointer when it knows how big the
1501 * string is. Stackblock (defined in stack.h) returns a pointer to a block
1502 * of space on top of the stack and stackblocklen returns the length of
1503 * this block. Growstackblock will grow this space by at least one byte,
1504 * possibly moving it (like realloc). Grabstackblock actually allocates the
1505 * part of the block that has been used.
1508 growstackblock(void)
1512 newlen = g_stacknleft * 2;
1513 if (newlen < g_stacknleft)
1514 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1518 if (g_stacknxt == g_stackp->space && g_stackp != &stackbase) {
1519 struct stack_block *oldstackp;
1520 struct stackmark *xmark;
1521 struct stack_block *sp;
1522 struct stack_block *prevstackp;
1526 oldstackp = g_stackp;
1528 prevstackp = sp->prev;
1529 grosslen = newlen + sizeof(struct stack_block) - MINSIZE;
1530 sp = ckrealloc(sp, grosslen);
1531 sp->prev = prevstackp;
1533 g_stacknxt = sp->space;
1534 g_stacknleft = newlen;
1535 sstrend = sp->space + newlen;
1538 * Stack marks pointing to the start of the old block
1539 * must be relocated to point to the new block
1542 while (xmark != NULL && xmark->stackp == oldstackp) {
1543 xmark->stackp = g_stackp;
1544 xmark->stacknxt = g_stacknxt;
1545 xmark->stacknleft = g_stacknleft;
1546 xmark = xmark->marknext;
1550 char *oldspace = g_stacknxt;
1551 size_t oldlen = g_stacknleft;
1552 char *p = stalloc(newlen);
1554 /* free the space we just allocated */
1555 g_stacknxt = memcpy(p, oldspace, oldlen);
1556 g_stacknleft += newlen;
1561 grabstackblock(size_t len)
1563 len = SHELL_ALIGN(len);
1565 g_stacknleft -= len;
1569 * The following routines are somewhat easier to use than the above.
1570 * The user declares a variable of type STACKSTR, which may be declared
1571 * to be a register. The macro STARTSTACKSTR initializes things. Then
1572 * the user uses the macro STPUTC to add characters to the string. In
1573 * effect, STPUTC(c, p) is the same as *p++ = c except that the stack is
1574 * grown as necessary. When the user is done, she can just leave the
1575 * string there and refer to it using stackblock(). Or she can allocate
1576 * the space for it using grabstackstr(). If it is necessary to allow
1577 * someone else to use the stack temporarily and then continue to grow
1578 * the string, the user should use grabstack to allocate the space, and
1579 * then call ungrabstr(p) to return to the previous mode of operation.
1581 * USTPUTC is like STPUTC except that it doesn't check for overflow.
1582 * CHECKSTACKSPACE can be called before USTPUTC to ensure that there
1583 * is space for at least one character.
1588 size_t len = stackblocksize();
1589 if (herefd >= 0 && len >= 1024) {
1590 full_write(herefd, stackblock(), len);
1591 return stackblock();
1594 return (char *)stackblock() + len;
1598 * Called from CHECKSTRSPACE.
1601 makestrspace(size_t newlen, char *p)
1603 size_t len = p - g_stacknxt;
1604 size_t size = stackblocksize();
1609 size = stackblocksize();
1611 if (nleft >= newlen)
1615 return (char *)stackblock() + len;
1619 stack_nputstr(const char *s, size_t n, char *p)
1621 p = makestrspace(n, p);
1622 p = (char *)memcpy(p, s, n) + n;
1627 stack_putstr(const char *s, char *p)
1629 return stack_nputstr(s, strlen(s), p);
1633 _STPUTC(int c, char *p)
1641 #define STARTSTACKSTR(p) ((p) = stackblock())
1642 #define STPUTC(c, p) ((p) = _STPUTC((c), (p)))
1643 #define CHECKSTRSPACE(n, p) do { \
1646 size_t m = sstrend - q; \
1648 (p) = makestrspace(l, q); \
1650 #define USTPUTC(c, p) (*(p)++ = (c))
1651 #define STACKSTRNUL(p) do { \
1652 if ((p) == sstrend) \
1653 (p) = growstackstr(); \
1656 #define STUNPUTC(p) (--(p))
1657 #define STTOPC(p) ((p)[-1])
1658 #define STADJUST(amount, p) ((p) += (amount))
1660 #define grabstackstr(p) stalloc((char *)(p) - (char *)stackblock())
1661 #define ungrabstackstr(s, p) stunalloc(s)
1662 #define stackstrend() ((void *)sstrend)
1665 /* ============ String helpers */
1668 * prefix -- see if pfx is a prefix of string.
1671 prefix(const char *string, const char *pfx)
1674 if (*pfx++ != *string++)
1677 return (char *) string;
1681 * Check for a valid number. This should be elsewhere.
1684 is_number(const char *p)
1689 } while (*++p != '\0');
1694 * Convert a string of digits to an integer, printing an error message on
1698 number(const char *s)
1701 ash_msg_and_raise_error(msg_illnum, s);
1706 * Produce a possibly single quoted string suitable as input to the shell.
1707 * The return string is allocated on the stack.
1710 single_quote(const char *s)
1720 len = strchrnul(s, '\'') - s;
1722 q = p = makestrspace(len + 3, p);
1725 q = (char *)memcpy(q, s, len) + len;
1734 do len++; while (*++s == '\'');
1736 q = p = makestrspace(len + 3, p);
1739 q = (char *)memcpy(q, s - len, len) + len;
1747 return stackblock();
1751 /* ============ nextopt */
1753 static char **argptr; /* argument list for builtin commands */
1754 static char *optionarg; /* set by nextopt (like getopt) */
1755 static char *optptr; /* used by nextopt */
1758 * XXX - should get rid of. Have all builtins use getopt(3).
1759 * The library getopt must have the BSD extension static variable
1760 * "optreset", otherwise it can't be used within the shell safely.
1762 * Standard option processing (a la getopt) for builtin routines.
1763 * The only argument that is passed to nextopt is the option string;
1764 * the other arguments are unnecessary. It returns the character,
1765 * or '\0' on end of input.
1768 nextopt(const char *optstring)
1775 if (p == NULL || *p == '\0') {
1776 /* We ate entire "-param", take next one */
1782 if (*++p == '\0') /* just "-" ? */
1785 if (LONE_DASH(p)) /* "--" ? */
1787 /* p => next "-param" */
1789 /* p => some option char in the middle of a "-param" */
1791 for (q = optstring; *q != c;) {
1793 ash_msg_and_raise_error("illegal option -%c", c);
1801 ash_msg_and_raise_error("no arg for -%c option", c);
1811 /* ============ Shell variables */
1814 * The parsefile structure pointed to by the global variable parsefile
1815 * contains information about the current file being read.
1818 int nparam; /* # of positional parameters (without $0) */
1819 #if ENABLE_ASH_GETOPTS
1820 int optind; /* next parameter to be processed by getopts */
1821 int optoff; /* used by getopts */
1823 unsigned char malloced; /* if parameter list dynamically allocated */
1824 char **p; /* parameter list */
1828 * Free the list of positional parameters.
1831 freeparam(volatile struct shparam *param)
1833 if (param->malloced) {
1835 ap = ap1 = param->p;
1842 #if ENABLE_ASH_GETOPTS
1843 static void FAST_FUNC getoptsreset(const char *value);
1847 struct var *next; /* next entry in hash list */
1848 int flags; /* flags are defined above */
1849 const char *var_text; /* name=value */
1850 void (*var_func)(const char *) FAST_FUNC; /* function to be called when */
1851 /* the variable gets set/unset */
1855 struct localvar *next; /* next local variable in list */
1856 struct var *vp; /* the variable that was made local */
1857 int flags; /* saved flags */
1858 const char *text; /* saved text */
1862 #define VEXPORT 0x01 /* variable is exported */
1863 #define VREADONLY 0x02 /* variable cannot be modified */
1864 #define VSTRFIXED 0x04 /* variable struct is statically allocated */
1865 #define VTEXTFIXED 0x08 /* text is statically allocated */
1866 #define VSTACK 0x10 /* text is allocated on the stack */
1867 #define VUNSET 0x20 /* the variable is not set */
1868 #define VNOFUNC 0x40 /* don't call the callback function */
1869 #define VNOSET 0x80 /* do not set variable - just readonly test */
1870 #define VNOSAVE 0x100 /* when text is on the heap before setvareq */
1871 #if ENABLE_ASH_RANDOM_SUPPORT
1872 # define VDYNAMIC 0x200 /* dynamic variable */
1878 /* Need to be before varinit_data[] */
1879 #if ENABLE_LOCALE_SUPPORT
1880 static void FAST_FUNC
1881 change_lc_all(const char *value)
1883 if (value && *value != '\0')
1884 setlocale(LC_ALL, value);
1886 static void FAST_FUNC
1887 change_lc_ctype(const char *value)
1889 if (value && *value != '\0')
1890 setlocale(LC_CTYPE, value);
1894 static void chkmail(void);
1895 static void changemail(const char *var_value) FAST_FUNC;
1897 # define chkmail() ((void)0)
1899 static void changepath(const char *) FAST_FUNC;
1900 #if ENABLE_ASH_RANDOM_SUPPORT
1901 static void change_random(const char *) FAST_FUNC;
1904 static const struct {
1906 const char *var_text;
1907 void (*var_func)(const char *) FAST_FUNC;
1908 } varinit_data[] = {
1910 * Note: VEXPORT would not work correctly here for NOFORK applets:
1911 * some environment strings may be constant.
1913 { VSTRFIXED|VTEXTFIXED , defifsvar , NULL },
1915 { VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL" , changemail },
1916 { VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH" , changemail },
1918 { VSTRFIXED|VTEXTFIXED , bb_PATH_root_path, changepath },
1919 { VSTRFIXED|VTEXTFIXED , "PS1=$ " , NULL },
1920 { VSTRFIXED|VTEXTFIXED , "PS2=> " , NULL },
1921 { VSTRFIXED|VTEXTFIXED , "PS4=+ " , NULL },
1922 #if ENABLE_ASH_GETOPTS
1923 { VSTRFIXED|VTEXTFIXED , "OPTIND=1" , getoptsreset },
1925 #if ENABLE_ASH_RANDOM_SUPPORT
1926 { VSTRFIXED|VTEXTFIXED|VUNSET|VDYNAMIC, "RANDOM", change_random },
1928 #if ENABLE_LOCALE_SUPPORT
1929 { VSTRFIXED|VTEXTFIXED|VUNSET, "LC_ALL" , change_lc_all },
1930 { VSTRFIXED|VTEXTFIXED|VUNSET, "LC_CTYPE" , change_lc_ctype },
1932 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
1933 { VSTRFIXED|VTEXTFIXED|VUNSET, "HISTFILE" , NULL },
1939 struct globals_var {
1940 struct shparam shellparam; /* $@ current positional parameters */
1941 struct redirtab *redirlist;
1943 int preverrout_fd; /* save fd2 before print debug if xflag is set. */
1944 struct var *vartab[VTABSIZE];
1945 struct var varinit[ARRAY_SIZE(varinit_data)];
1947 extern struct globals_var *const ash_ptr_to_globals_var;
1948 #define G_var (*ash_ptr_to_globals_var)
1949 #define shellparam (G_var.shellparam )
1950 //#define redirlist (G_var.redirlist )
1951 #define g_nullredirs (G_var.g_nullredirs )
1952 #define preverrout_fd (G_var.preverrout_fd)
1953 #define vartab (G_var.vartab )
1954 #define varinit (G_var.varinit )
1955 #define INIT_G_var() do { \
1957 (*(struct globals_var**)&ash_ptr_to_globals_var) = xzalloc(sizeof(G_var)); \
1959 for (i = 0; i < ARRAY_SIZE(varinit_data); i++) { \
1960 varinit[i].flags = varinit_data[i].flags; \
1961 varinit[i].var_text = varinit_data[i].var_text; \
1962 varinit[i].var_func = varinit_data[i].var_func; \
1966 #define vifs varinit[0]
1968 # define vmail (&vifs)[1]
1969 # define vmpath (&vmail)[1]
1970 # define vpath (&vmpath)[1]
1972 # define vpath (&vifs)[1]
1974 #define vps1 (&vpath)[1]
1975 #define vps2 (&vps1)[1]
1976 #define vps4 (&vps2)[1]
1977 #if ENABLE_ASH_GETOPTS
1978 # define voptind (&vps4)[1]
1979 # if ENABLE_ASH_RANDOM_SUPPORT
1980 # define vrandom (&voptind)[1]
1983 # if ENABLE_ASH_RANDOM_SUPPORT
1984 # define vrandom (&vps4)[1]
1989 * The following macros access the values of the above variables.
1990 * They have to skip over the name. They return the null string
1991 * for unset variables.
1993 #define ifsval() (vifs.var_text + 4)
1994 #define ifsset() ((vifs.flags & VUNSET) == 0)
1996 # define mailval() (vmail.var_text + 5)
1997 # define mpathval() (vmpath.var_text + 9)
1998 # define mpathset() ((vmpath.flags & VUNSET) == 0)
2000 #define pathval() (vpath.var_text + 5)
2001 #define ps1val() (vps1.var_text + 4)
2002 #define ps2val() (vps2.var_text + 4)
2003 #define ps4val() (vps4.var_text + 4)
2004 #if ENABLE_ASH_GETOPTS
2005 # define optindval() (voptind.var_text + 7)
2008 #if ENABLE_ASH_GETOPTS
2009 static void FAST_FUNC
2010 getoptsreset(const char *value)
2012 shellparam.optind = number(value);
2013 shellparam.optoff = -1;
2018 * Compares two strings up to the first = or '\0'. The first
2019 * string must be terminated by '='; the second may be terminated by
2020 * either '=' or '\0'.
2023 varcmp(const char *p, const char *q)
2027 while ((c = *p) == (d = *q)) {
2028 if (c == '\0' || c == '=')
2042 * Find the appropriate entry in the hash table from the name.
2044 static struct var **
2045 hashvar(const char *p)
2049 hashval = ((unsigned char) *p) << 4;
2050 while (*p && *p != '=')
2051 hashval += (unsigned char) *p++;
2052 return &vartab[hashval % VTABSIZE];
2056 vpcmp(const void *a, const void *b)
2058 return varcmp(*(const char **)a, *(const char **)b);
2062 * This routine initializes the builtin variables.
2072 * PS1 depends on uid
2074 #if ENABLE_FEATURE_EDITING && ENABLE_FEATURE_EDITING_FANCY_PROMPT
2075 vps1.var_text = "PS1=\\w \\$ ";
2078 vps1.var_text = "PS1=# ";
2081 end = vp + ARRAY_SIZE(varinit);
2083 vpp = hashvar(vp->var_text);
2086 } while (++vp < end);
2089 static struct var **
2090 findvar(struct var **vpp, const char *name)
2092 for (; *vpp; vpp = &(*vpp)->next) {
2093 if (varcmp((*vpp)->var_text, name) == 0) {
2101 * Find the value of a variable. Returns NULL if not set.
2103 static const char* FAST_FUNC
2104 lookupvar(const char *name)
2108 v = *findvar(hashvar(name), name);
2110 #if ENABLE_ASH_RANDOM_SUPPORT
2112 * Dynamic variables are implemented roughly the same way they are
2113 * in bash. Namely, they're "special" so long as they aren't unset.
2114 * As soon as they're unset, they're no longer dynamic, and dynamic
2115 * lookup will no longer happen at that point. -- PFM.
2117 if (v->flags & VDYNAMIC)
2120 if (!(v->flags & VUNSET))
2121 return var_end(v->var_text);
2126 static void reinit_unicode_for_ash(void)
2128 /* Unicode support should be activated even if LANG is set
2129 * _during_ shell execution, not only if it was set when
2130 * shell was started. Therefore, re-check LANG every time:
2132 if (ENABLE_FEATURE_CHECK_UNICODE_IN_ENV
2133 || ENABLE_UNICODE_USING_LOCALE
2135 const char *s = lookupvar("LC_ALL");
2136 if (!s) s = lookupvar("LC_CTYPE");
2137 if (!s) s = lookupvar("LANG");
2143 * Search the environment of a builtin command.
2146 bltinlookup(const char *name)
2150 for (sp = cmdenviron; sp; sp = sp->next) {
2151 if (varcmp(sp->text, name) == 0)
2152 return var_end(sp->text);
2154 return lookupvar(name);
2158 * Same as setvar except that the variable and value are passed in
2159 * the first argument as name=value. Since the first argument will
2160 * be actually stored in the table, it should not be a string that
2162 * Called with interrupts off.
2165 setvareq(char *s, int flags)
2167 struct var *vp, **vpp;
2170 flags |= (VEXPORT & (((unsigned) (1 - aflag)) - 1));
2171 vp = *findvar(vpp, s);
2173 if ((vp->flags & (VREADONLY|VDYNAMIC)) == VREADONLY) {
2176 if (flags & VNOSAVE)
2179 ash_msg_and_raise_error("%.*s: is read only", strchrnul(n, '=') - n, n);
2185 if (vp->var_func && !(flags & VNOFUNC))
2186 vp->var_func(var_end(s));
2188 if (!(vp->flags & (VTEXTFIXED|VSTACK)))
2189 free((char*)vp->var_text);
2191 flags |= vp->flags & ~(VTEXTFIXED|VSTACK|VNOSAVE|VUNSET);
2193 /* variable s is not found */
2196 vp = ckzalloc(sizeof(*vp));
2198 /*vp->func = NULL; - ckzalloc did it */
2201 if (!(flags & (VTEXTFIXED|VSTACK|VNOSAVE)))
2208 * Set the value of a variable. The flags argument is ored with the
2209 * flags of the variable. If val is NULL, the variable is unset.
2212 setvar(const char *name, const char *val, int flags)
2220 q = endofname(name);
2221 p = strchrnul(q, '=');
2223 if (!namelen || p != q)
2224 ash_msg_and_raise_error("%.*s: bad variable name", namelen, name);
2229 vallen = strlen(val);
2233 nameeq = ckmalloc(namelen + vallen + 2);
2234 p = memcpy(nameeq, name, namelen) + namelen;
2237 p = memcpy(p, val, vallen) + vallen;
2240 setvareq(nameeq, flags | VNOSAVE);
2244 static void FAST_FUNC
2245 setvar0(const char *name, const char *val)
2247 setvar(name, val, 0);
2250 #if ENABLE_ASH_GETOPTS
2252 * Safe version of setvar, returns 1 on success 0 on failure.
2255 setvarsafe(const char *name, const char *val, int flags)
2258 volatile int saveint;
2259 struct jmploc *volatile savehandler = exception_handler;
2260 struct jmploc jmploc;
2263 if (setjmp(jmploc.loc))
2266 exception_handler = &jmploc;
2267 setvar(name, val, flags);
2270 exception_handler = savehandler;
2271 RESTORE_INT(saveint);
2277 * Unset the specified variable.
2280 unsetvar(const char *s)
2286 vpp = findvar(hashvar(s), s);
2290 int flags = vp->flags;
2293 if (flags & VREADONLY)
2295 #if ENABLE_ASH_RANDOM_SUPPORT
2296 vp->flags &= ~VDYNAMIC;
2300 if ((flags & VSTRFIXED) == 0) {
2302 if ((flags & (VTEXTFIXED|VSTACK)) == 0)
2303 free((char*)vp->var_text);
2309 vp->flags &= ~VEXPORT;
2319 * Process a linked list of variable assignments.
2322 listsetvar(struct strlist *list_set_var, int flags)
2324 struct strlist *lp = list_set_var;
2330 setvareq(lp->text, flags);
2337 * Generate a list of variables satisfying the given conditions.
2340 listvars(int on, int off, char ***end)
2351 for (vp = *vpp; vp; vp = vp->next) {
2352 if ((vp->flags & mask) == on) {
2353 if (ep == stackstrend())
2354 ep = growstackstr();
2355 *ep++ = (char*)vp->var_text;
2358 } while (++vpp < vartab + VTABSIZE);
2359 if (ep == stackstrend())
2360 ep = growstackstr();
2364 return grabstackstr(ep);
2368 /* ============ Path search helper
2370 * The variable path (passed by reference) should be set to the start
2371 * of the path before the first call; path_advance will update
2372 * this value as it proceeds. Successive calls to path_advance will return
2373 * the possible path expansions in sequence. If an option (indicated by
2374 * a percent sign) appears in the path entry then the global variable
2375 * pathopt will be set to point to it; otherwise pathopt will be set to
2378 static const char *pathopt; /* set by path_advance */
2381 path_advance(const char **path, const char *name)
2391 for (p = start; *p && *p != ':' && *p != '%'; p++)
2393 len = p - start + strlen(name) + 2; /* "2" is for '/' and '\0' */
2394 while (stackblocksize() < len)
2398 memcpy(q, start, p - start);
2406 while (*p && *p != ':')
2413 return stalloc(len);
2417 /* ============ Prompt */
2419 static smallint doprompt; /* if set, prompt the user */
2420 static smallint needprompt; /* true if interactive and at start of line */
2422 #if ENABLE_FEATURE_EDITING
2423 static line_input_t *line_input_state;
2424 static const char *cmdedit_prompt;
2426 putprompt(const char *s)
2428 if (ENABLE_ASH_EXPAND_PRMT) {
2429 free((char*)cmdedit_prompt);
2430 cmdedit_prompt = ckstrdup(s);
2437 putprompt(const char *s)
2443 #if ENABLE_ASH_EXPAND_PRMT
2444 /* expandstr() needs parsing machinery, so it is far away ahead... */
2445 static const char *expandstr(const char *ps);
2447 #define expandstr(s) s
2451 setprompt_if(smallint do_set, int whichprompt)
2454 IF_ASH_EXPAND_PRMT(struct stackmark smark;)
2461 switch (whichprompt) {
2471 #if ENABLE_ASH_EXPAND_PRMT
2472 setstackmark(&smark);
2473 stalloc(stackblocksize());
2475 putprompt(expandstr(prompt));
2476 #if ENABLE_ASH_EXPAND_PRMT
2477 popstackmark(&smark);
2482 /* ============ The cd and pwd commands */
2484 #define CD_PHYSICAL 1
2494 while ((i = nextopt("LP")) != '\0') {
2496 flags ^= CD_PHYSICAL;
2505 * Update curdir (the name of the current directory) in response to a
2509 updatepwd(const char *dir)
2516 cdcomppath = ststrdup(dir);
2519 if (curdir == nullstr)
2521 new = stack_putstr(curdir, new);
2523 new = makestrspace(strlen(dir) + 2, new);
2524 lim = (char *)stackblock() + 1;
2528 if (new > lim && *lim == '/')
2533 if (dir[1] == '/' && dir[2] != '/') {
2539 p = strtok(cdcomppath, "/");
2543 if (p[1] == '.' && p[2] == '\0') {
2555 new = stack_putstr(p, new);
2558 p = strtok(NULL, "/");
2563 return stackblock();
2567 * Find out what the current directory is. If we already know the current
2568 * directory, this routine returns immediately.
2573 char *dir = getcwd(NULL, 0); /* huh, using glibc extension? */
2574 return dir ? dir : nullstr;
2578 setpwd(const char *val, int setold)
2582 oldcur = dir = curdir;
2585 setvar("OLDPWD", oldcur, VEXPORT);
2588 if (physdir != nullstr) {
2589 if (physdir != oldcur)
2593 if (oldcur == val || !val) {
2599 dir = ckstrdup(val);
2600 if (oldcur != dir && oldcur != nullstr) {
2605 setvar("PWD", dir, VEXPORT);
2608 static void hashcd(void);
2611 * Actually do the chdir. We also call hashcd to let the routines in exec.c
2612 * know that the current directory has changed.
2615 docd(const char *dest, int flags)
2617 const char *dir = NULL;
2620 TRACE(("docd(\"%s\", %d) called\n", dest, flags));
2623 if (!(flags & CD_PHYSICAL)) {
2624 dir = updatepwd(dest);
2638 static int FAST_FUNC
2639 cdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
2651 dest = bltinlookup("HOME");
2652 else if (LONE_DASH(dest)) {
2653 dest = bltinlookup("OLDPWD");
2675 path = bltinlookup("CDPATH");
2684 p = path_advance(&path, dest);
2685 if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
2689 if (!docd(p, flags))
2694 ash_msg_and_raise_error("can't cd to %s", dest);
2697 if (flags & CD_PRINT)
2698 out1fmt("%s\n", curdir);
2702 static int FAST_FUNC
2703 pwdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
2706 const char *dir = curdir;
2710 if (physdir == nullstr)
2714 out1fmt("%s\n", dir);
2719 /* ============ ... */
2722 #define IBUFSIZ (ENABLE_FEATURE_EDITING ? CONFIG_FEATURE_EDITING_MAX_LEN : 1024)
2724 /* Syntax classes */
2725 #define CWORD 0 /* character is nothing special */
2726 #define CNL 1 /* newline character */
2727 #define CBACK 2 /* a backslash character */
2728 #define CSQUOTE 3 /* single quote */
2729 #define CDQUOTE 4 /* double quote */
2730 #define CENDQUOTE 5 /* a terminating quote */
2731 #define CBQUOTE 6 /* backwards single quote */
2732 #define CVAR 7 /* a dollar sign */
2733 #define CENDVAR 8 /* a '}' character */
2734 #define CLP 9 /* a left paren in arithmetic */
2735 #define CRP 10 /* a right paren in arithmetic */
2736 #define CENDFILE 11 /* end of file */
2737 #define CCTL 12 /* like CWORD, except it must be escaped */
2738 #define CSPCL 13 /* these terminate a word */
2739 #define CIGN 14 /* character should be ignored */
2742 #if ENABLE_ASH_ALIAS
2746 #define USE_SIT_FUNCTION ENABLE_ASH_OPTIMIZE_FOR_SIZE
2748 #if ENABLE_SH_MATH_SUPPORT
2749 # define SIT_ITEM(a,b,c,d) (a | (b << 4) | (c << 8) | (d << 12))
2751 # define SIT_ITEM(a,b,c,d) (a | (b << 4) | (c << 8))
2753 static const uint16_t S_I_T[] ALIGN2 = {
2754 #if ENABLE_ASH_ALIAS
2755 SIT_ITEM(CSPCL , CIGN , CIGN , CIGN ), /* 0, PEOA */
2757 SIT_ITEM(CSPCL , CWORD , CWORD, CWORD ), /* 1, ' ' */
2758 SIT_ITEM(CNL , CNL , CNL , CNL ), /* 2, \n */
2759 SIT_ITEM(CWORD , CCTL , CCTL , CWORD ), /* 3, !*-/:=?[]~ */
2760 SIT_ITEM(CDQUOTE , CENDQUOTE, CWORD, CWORD ), /* 4, '"' */
2761 SIT_ITEM(CVAR , CVAR , CWORD, CVAR ), /* 5, $ */
2762 SIT_ITEM(CSQUOTE , CWORD , CENDQUOTE, CWORD), /* 6, "'" */
2763 SIT_ITEM(CSPCL , CWORD , CWORD, CLP ), /* 7, ( */
2764 SIT_ITEM(CSPCL , CWORD , CWORD, CRP ), /* 8, ) */
2765 SIT_ITEM(CBACK , CBACK , CCTL , CBACK ), /* 9, \ */
2766 SIT_ITEM(CBQUOTE , CBQUOTE , CWORD, CBQUOTE), /* 10, ` */
2767 SIT_ITEM(CENDVAR , CENDVAR , CWORD, CENDVAR), /* 11, } */
2768 #if !USE_SIT_FUNCTION
2769 SIT_ITEM(CENDFILE, CENDFILE , CENDFILE, CENDFILE),/* 12, PEOF */
2770 SIT_ITEM(CWORD , CWORD , CWORD, CWORD ), /* 13, 0-9A-Za-z */
2771 SIT_ITEM(CCTL , CCTL , CCTL , CCTL ) /* 14, CTLESC ... */
2775 /* Constants below must match table above */
2777 #if ENABLE_ASH_ALIAS
2778 CSPCL_CIGN_CIGN_CIGN , /* 0 */
2780 CSPCL_CWORD_CWORD_CWORD , /* 1 */
2781 CNL_CNL_CNL_CNL , /* 2 */
2782 CWORD_CCTL_CCTL_CWORD , /* 3 */
2783 CDQUOTE_CENDQUOTE_CWORD_CWORD , /* 4 */
2784 CVAR_CVAR_CWORD_CVAR , /* 5 */
2785 CSQUOTE_CWORD_CENDQUOTE_CWORD , /* 6 */
2786 CSPCL_CWORD_CWORD_CLP , /* 7 */
2787 CSPCL_CWORD_CWORD_CRP , /* 8 */
2788 CBACK_CBACK_CCTL_CBACK , /* 9 */
2789 CBQUOTE_CBQUOTE_CWORD_CBQUOTE , /* 10 */
2790 CENDVAR_CENDVAR_CWORD_CENDVAR , /* 11 */
2791 CENDFILE_CENDFILE_CENDFILE_CENDFILE, /* 12 */
2792 CWORD_CWORD_CWORD_CWORD , /* 13 */
2793 CCTL_CCTL_CCTL_CCTL , /* 14 */
2796 /* c in SIT(c, syntax) must be an *unsigned char* or PEOA or PEOF,
2797 * caller must ensure proper cast on it if c is *char_ptr!
2799 /* Values for syntax param */
2800 #define BASESYNTAX 0 /* not in quotes */
2801 #define DQSYNTAX 1 /* in double quotes */
2802 #define SQSYNTAX 2 /* in single quotes */
2803 #define ARISYNTAX 3 /* in arithmetic */
2804 #define PSSYNTAX 4 /* prompt. never passed to SIT() */
2806 #if USE_SIT_FUNCTION
2809 SIT(int c, int syntax)
2811 static const char spec_symbls[] ALIGN1 = "\t\n !\"$&'()*-/:;<=>?[\\]`|}~";
2812 # if ENABLE_ASH_ALIAS
2813 static const uint8_t syntax_index_table[] ALIGN1 = {
2814 1, 2, 1, 3, 4, 5, 1, 6, /* "\t\n !\"$&'" */
2815 7, 8, 3, 3, 3, 3, 1, 1, /* "()*-/:;<" */
2816 3, 1, 3, 3, 9, 3, 10, 1, /* "=>?[\\]`|" */
2820 static const uint8_t syntax_index_table[] ALIGN1 = {
2821 0, 1, 0, 2, 3, 4, 0, 5, /* "\t\n !\"$&'" */
2822 6, 7, 2, 2, 2, 2, 0, 0, /* "()*-/:;<" */
2823 2, 0, 2, 2, 8, 2, 9, 0, /* "=>?[\\]`|" */
2832 # if ENABLE_ASH_ALIAS
2838 /* Cast is purely for paranoia here,
2839 * just in case someone passed signed char to us */
2840 if ((unsigned char)c >= CTL_FIRST
2841 && (unsigned char)c <= CTL_LAST
2845 s = strchrnul(spec_symbls, c);
2848 indx = syntax_index_table[s - spec_symbls];
2850 return (S_I_T[indx] >> (syntax*4)) & 0xf;
2853 #else /* !USE_SIT_FUNCTION */
2855 static const uint8_t syntax_index_table[] ALIGN1 = {
2856 /* BASESYNTAX_DQSYNTAX_SQSYNTAX_ARISYNTAX */
2857 /* 0 */ CWORD_CWORD_CWORD_CWORD,
2858 /* 1 */ CWORD_CWORD_CWORD_CWORD,
2859 /* 2 */ CWORD_CWORD_CWORD_CWORD,
2860 /* 3 */ CWORD_CWORD_CWORD_CWORD,
2861 /* 4 */ CWORD_CWORD_CWORD_CWORD,
2862 /* 5 */ CWORD_CWORD_CWORD_CWORD,
2863 /* 6 */ CWORD_CWORD_CWORD_CWORD,
2864 /* 7 */ CWORD_CWORD_CWORD_CWORD,
2865 /* 8 */ CWORD_CWORD_CWORD_CWORD,
2866 /* 9 "\t" */ CSPCL_CWORD_CWORD_CWORD,
2867 /* 10 "\n" */ CNL_CNL_CNL_CNL,
2868 /* 11 */ CWORD_CWORD_CWORD_CWORD,
2869 /* 12 */ CWORD_CWORD_CWORD_CWORD,
2870 /* 13 */ CWORD_CWORD_CWORD_CWORD,
2871 /* 14 */ CWORD_CWORD_CWORD_CWORD,
2872 /* 15 */ CWORD_CWORD_CWORD_CWORD,
2873 /* 16 */ CWORD_CWORD_CWORD_CWORD,
2874 /* 17 */ CWORD_CWORD_CWORD_CWORD,
2875 /* 18 */ CWORD_CWORD_CWORD_CWORD,
2876 /* 19 */ CWORD_CWORD_CWORD_CWORD,
2877 /* 20 */ CWORD_CWORD_CWORD_CWORD,
2878 /* 21 */ CWORD_CWORD_CWORD_CWORD,
2879 /* 22 */ CWORD_CWORD_CWORD_CWORD,
2880 /* 23 */ CWORD_CWORD_CWORD_CWORD,
2881 /* 24 */ CWORD_CWORD_CWORD_CWORD,
2882 /* 25 */ CWORD_CWORD_CWORD_CWORD,
2883 /* 26 */ CWORD_CWORD_CWORD_CWORD,
2884 /* 27 */ CWORD_CWORD_CWORD_CWORD,
2885 /* 28 */ CWORD_CWORD_CWORD_CWORD,
2886 /* 29 */ CWORD_CWORD_CWORD_CWORD,
2887 /* 30 */ CWORD_CWORD_CWORD_CWORD,
2888 /* 31 */ CWORD_CWORD_CWORD_CWORD,
2889 /* 32 " " */ CSPCL_CWORD_CWORD_CWORD,
2890 /* 33 "!" */ CWORD_CCTL_CCTL_CWORD,
2891 /* 34 """ */ CDQUOTE_CENDQUOTE_CWORD_CWORD,
2892 /* 35 "#" */ CWORD_CWORD_CWORD_CWORD,
2893 /* 36 "$" */ CVAR_CVAR_CWORD_CVAR,
2894 /* 37 "%" */ CWORD_CWORD_CWORD_CWORD,
2895 /* 38 "&" */ CSPCL_CWORD_CWORD_CWORD,
2896 /* 39 "'" */ CSQUOTE_CWORD_CENDQUOTE_CWORD,
2897 /* 40 "(" */ CSPCL_CWORD_CWORD_CLP,
2898 /* 41 ")" */ CSPCL_CWORD_CWORD_CRP,
2899 /* 42 "*" */ CWORD_CCTL_CCTL_CWORD,
2900 /* 43 "+" */ CWORD_CWORD_CWORD_CWORD,
2901 /* 44 "," */ CWORD_CWORD_CWORD_CWORD,
2902 /* 45 "-" */ CWORD_CCTL_CCTL_CWORD,
2903 /* 46 "." */ CWORD_CWORD_CWORD_CWORD,
2904 /* 47 "/" */ CWORD_CCTL_CCTL_CWORD,
2905 /* 48 "0" */ CWORD_CWORD_CWORD_CWORD,
2906 /* 49 "1" */ CWORD_CWORD_CWORD_CWORD,
2907 /* 50 "2" */ CWORD_CWORD_CWORD_CWORD,
2908 /* 51 "3" */ CWORD_CWORD_CWORD_CWORD,
2909 /* 52 "4" */ CWORD_CWORD_CWORD_CWORD,
2910 /* 53 "5" */ CWORD_CWORD_CWORD_CWORD,
2911 /* 54 "6" */ CWORD_CWORD_CWORD_CWORD,
2912 /* 55 "7" */ CWORD_CWORD_CWORD_CWORD,
2913 /* 56 "8" */ CWORD_CWORD_CWORD_CWORD,
2914 /* 57 "9" */ CWORD_CWORD_CWORD_CWORD,
2915 /* 58 ":" */ CWORD_CCTL_CCTL_CWORD,
2916 /* 59 ";" */ CSPCL_CWORD_CWORD_CWORD,
2917 /* 60 "<" */ CSPCL_CWORD_CWORD_CWORD,
2918 /* 61 "=" */ CWORD_CCTL_CCTL_CWORD,
2919 /* 62 ">" */ CSPCL_CWORD_CWORD_CWORD,
2920 /* 63 "?" */ CWORD_CCTL_CCTL_CWORD,
2921 /* 64 "@" */ CWORD_CWORD_CWORD_CWORD,
2922 /* 65 "A" */ CWORD_CWORD_CWORD_CWORD,
2923 /* 66 "B" */ CWORD_CWORD_CWORD_CWORD,
2924 /* 67 "C" */ CWORD_CWORD_CWORD_CWORD,
2925 /* 68 "D" */ CWORD_CWORD_CWORD_CWORD,
2926 /* 69 "E" */ CWORD_CWORD_CWORD_CWORD,
2927 /* 70 "F" */ CWORD_CWORD_CWORD_CWORD,
2928 /* 71 "G" */ CWORD_CWORD_CWORD_CWORD,
2929 /* 72 "H" */ CWORD_CWORD_CWORD_CWORD,
2930 /* 73 "I" */ CWORD_CWORD_CWORD_CWORD,
2931 /* 74 "J" */ CWORD_CWORD_CWORD_CWORD,
2932 /* 75 "K" */ CWORD_CWORD_CWORD_CWORD,
2933 /* 76 "L" */ CWORD_CWORD_CWORD_CWORD,
2934 /* 77 "M" */ CWORD_CWORD_CWORD_CWORD,
2935 /* 78 "N" */ CWORD_CWORD_CWORD_CWORD,
2936 /* 79 "O" */ CWORD_CWORD_CWORD_CWORD,
2937 /* 80 "P" */ CWORD_CWORD_CWORD_CWORD,
2938 /* 81 "Q" */ CWORD_CWORD_CWORD_CWORD,
2939 /* 82 "R" */ CWORD_CWORD_CWORD_CWORD,
2940 /* 83 "S" */ CWORD_CWORD_CWORD_CWORD,
2941 /* 84 "T" */ CWORD_CWORD_CWORD_CWORD,
2942 /* 85 "U" */ CWORD_CWORD_CWORD_CWORD,
2943 /* 86 "V" */ CWORD_CWORD_CWORD_CWORD,
2944 /* 87 "W" */ CWORD_CWORD_CWORD_CWORD,
2945 /* 88 "X" */ CWORD_CWORD_CWORD_CWORD,
2946 /* 89 "Y" */ CWORD_CWORD_CWORD_CWORD,
2947 /* 90 "Z" */ CWORD_CWORD_CWORD_CWORD,
2948 /* 91 "[" */ CWORD_CCTL_CCTL_CWORD,
2949 /* 92 "\" */ CBACK_CBACK_CCTL_CBACK,
2950 /* 93 "]" */ CWORD_CCTL_CCTL_CWORD,
2951 /* 94 "^" */ CWORD_CWORD_CWORD_CWORD,
2952 /* 95 "_" */ CWORD_CWORD_CWORD_CWORD,
2953 /* 96 "`" */ CBQUOTE_CBQUOTE_CWORD_CBQUOTE,
2954 /* 97 "a" */ CWORD_CWORD_CWORD_CWORD,
2955 /* 98 "b" */ CWORD_CWORD_CWORD_CWORD,
2956 /* 99 "c" */ CWORD_CWORD_CWORD_CWORD,
2957 /* 100 "d" */ CWORD_CWORD_CWORD_CWORD,
2958 /* 101 "e" */ CWORD_CWORD_CWORD_CWORD,
2959 /* 102 "f" */ CWORD_CWORD_CWORD_CWORD,
2960 /* 103 "g" */ CWORD_CWORD_CWORD_CWORD,
2961 /* 104 "h" */ CWORD_CWORD_CWORD_CWORD,
2962 /* 105 "i" */ CWORD_CWORD_CWORD_CWORD,
2963 /* 106 "j" */ CWORD_CWORD_CWORD_CWORD,
2964 /* 107 "k" */ CWORD_CWORD_CWORD_CWORD,
2965 /* 108 "l" */ CWORD_CWORD_CWORD_CWORD,
2966 /* 109 "m" */ CWORD_CWORD_CWORD_CWORD,
2967 /* 110 "n" */ CWORD_CWORD_CWORD_CWORD,
2968 /* 111 "o" */ CWORD_CWORD_CWORD_CWORD,
2969 /* 112 "p" */ CWORD_CWORD_CWORD_CWORD,
2970 /* 113 "q" */ CWORD_CWORD_CWORD_CWORD,
2971 /* 114 "r" */ CWORD_CWORD_CWORD_CWORD,
2972 /* 115 "s" */ CWORD_CWORD_CWORD_CWORD,
2973 /* 116 "t" */ CWORD_CWORD_CWORD_CWORD,
2974 /* 117 "u" */ CWORD_CWORD_CWORD_CWORD,
2975 /* 118 "v" */ CWORD_CWORD_CWORD_CWORD,
2976 /* 119 "w" */ CWORD_CWORD_CWORD_CWORD,
2977 /* 120 "x" */ CWORD_CWORD_CWORD_CWORD,
2978 /* 121 "y" */ CWORD_CWORD_CWORD_CWORD,
2979 /* 122 "z" */ CWORD_CWORD_CWORD_CWORD,
2980 /* 123 "{" */ CWORD_CWORD_CWORD_CWORD,
2981 /* 124 "|" */ CSPCL_CWORD_CWORD_CWORD,
2982 /* 125 "}" */ CENDVAR_CENDVAR_CWORD_CENDVAR,
2983 /* 126 "~" */ CWORD_CCTL_CCTL_CWORD,
2984 /* 127 del */ CWORD_CWORD_CWORD_CWORD,
2985 /* 128 0x80 */ CWORD_CWORD_CWORD_CWORD,
2986 /* 129 CTLESC */ CCTL_CCTL_CCTL_CCTL,
2987 /* 130 CTLVAR */ CCTL_CCTL_CCTL_CCTL,
2988 /* 131 CTLENDVAR */ CCTL_CCTL_CCTL_CCTL,
2989 /* 132 CTLBACKQ */ CCTL_CCTL_CCTL_CCTL,
2990 /* 133 CTLQUOTE */ CCTL_CCTL_CCTL_CCTL,
2991 /* 134 CTLARI */ CCTL_CCTL_CCTL_CCTL,
2992 /* 135 CTLENDARI */ CCTL_CCTL_CCTL_CCTL,
2993 /* 136 CTLQUOTEMARK */ CCTL_CCTL_CCTL_CCTL,
2994 /* 137 */ CWORD_CWORD_CWORD_CWORD,
2995 /* 138 */ CWORD_CWORD_CWORD_CWORD,
2996 /* 139 */ CWORD_CWORD_CWORD_CWORD,
2997 /* 140 */ CWORD_CWORD_CWORD_CWORD,
2998 /* 141 */ CWORD_CWORD_CWORD_CWORD,
2999 /* 142 */ CWORD_CWORD_CWORD_CWORD,
3000 /* 143 */ CWORD_CWORD_CWORD_CWORD,
3001 /* 144 */ CWORD_CWORD_CWORD_CWORD,
3002 /* 145 */ CWORD_CWORD_CWORD_CWORD,
3003 /* 146 */ CWORD_CWORD_CWORD_CWORD,
3004 /* 147 */ CWORD_CWORD_CWORD_CWORD,
3005 /* 148 */ CWORD_CWORD_CWORD_CWORD,
3006 /* 149 */ CWORD_CWORD_CWORD_CWORD,
3007 /* 150 */ CWORD_CWORD_CWORD_CWORD,
3008 /* 151 */ CWORD_CWORD_CWORD_CWORD,
3009 /* 152 */ CWORD_CWORD_CWORD_CWORD,
3010 /* 153 */ CWORD_CWORD_CWORD_CWORD,
3011 /* 154 */ CWORD_CWORD_CWORD_CWORD,
3012 /* 155 */ CWORD_CWORD_CWORD_CWORD,
3013 /* 156 */ CWORD_CWORD_CWORD_CWORD,
3014 /* 157 */ CWORD_CWORD_CWORD_CWORD,
3015 /* 158 */ CWORD_CWORD_CWORD_CWORD,
3016 /* 159 */ CWORD_CWORD_CWORD_CWORD,
3017 /* 160 */ CWORD_CWORD_CWORD_CWORD,
3018 /* 161 */ CWORD_CWORD_CWORD_CWORD,
3019 /* 162 */ CWORD_CWORD_CWORD_CWORD,
3020 /* 163 */ CWORD_CWORD_CWORD_CWORD,
3021 /* 164 */ CWORD_CWORD_CWORD_CWORD,
3022 /* 165 */ CWORD_CWORD_CWORD_CWORD,
3023 /* 166 */ CWORD_CWORD_CWORD_CWORD,
3024 /* 167 */ CWORD_CWORD_CWORD_CWORD,
3025 /* 168 */ CWORD_CWORD_CWORD_CWORD,
3026 /* 169 */ CWORD_CWORD_CWORD_CWORD,
3027 /* 170 */ CWORD_CWORD_CWORD_CWORD,
3028 /* 171 */ CWORD_CWORD_CWORD_CWORD,
3029 /* 172 */ CWORD_CWORD_CWORD_CWORD,
3030 /* 173 */ CWORD_CWORD_CWORD_CWORD,
3031 /* 174 */ CWORD_CWORD_CWORD_CWORD,
3032 /* 175 */ CWORD_CWORD_CWORD_CWORD,
3033 /* 176 */ CWORD_CWORD_CWORD_CWORD,
3034 /* 177 */ CWORD_CWORD_CWORD_CWORD,
3035 /* 178 */ CWORD_CWORD_CWORD_CWORD,
3036 /* 179 */ CWORD_CWORD_CWORD_CWORD,
3037 /* 180 */ CWORD_CWORD_CWORD_CWORD,
3038 /* 181 */ CWORD_CWORD_CWORD_CWORD,
3039 /* 182 */ CWORD_CWORD_CWORD_CWORD,
3040 /* 183 */ CWORD_CWORD_CWORD_CWORD,
3041 /* 184 */ CWORD_CWORD_CWORD_CWORD,
3042 /* 185 */ CWORD_CWORD_CWORD_CWORD,
3043 /* 186 */ CWORD_CWORD_CWORD_CWORD,
3044 /* 187 */ CWORD_CWORD_CWORD_CWORD,
3045 /* 188 */ CWORD_CWORD_CWORD_CWORD,
3046 /* 189 */ CWORD_CWORD_CWORD_CWORD,
3047 /* 190 */ CWORD_CWORD_CWORD_CWORD,
3048 /* 191 */ CWORD_CWORD_CWORD_CWORD,
3049 /* 192 */ CWORD_CWORD_CWORD_CWORD,
3050 /* 193 */ CWORD_CWORD_CWORD_CWORD,
3051 /* 194 */ CWORD_CWORD_CWORD_CWORD,
3052 /* 195 */ CWORD_CWORD_CWORD_CWORD,
3053 /* 196 */ CWORD_CWORD_CWORD_CWORD,
3054 /* 197 */ CWORD_CWORD_CWORD_CWORD,
3055 /* 198 */ CWORD_CWORD_CWORD_CWORD,
3056 /* 199 */ CWORD_CWORD_CWORD_CWORD,
3057 /* 200 */ CWORD_CWORD_CWORD_CWORD,
3058 /* 201 */ CWORD_CWORD_CWORD_CWORD,
3059 /* 202 */ CWORD_CWORD_CWORD_CWORD,
3060 /* 203 */ CWORD_CWORD_CWORD_CWORD,
3061 /* 204 */ CWORD_CWORD_CWORD_CWORD,
3062 /* 205 */ CWORD_CWORD_CWORD_CWORD,
3063 /* 206 */ CWORD_CWORD_CWORD_CWORD,
3064 /* 207 */ CWORD_CWORD_CWORD_CWORD,
3065 /* 208 */ CWORD_CWORD_CWORD_CWORD,
3066 /* 209 */ CWORD_CWORD_CWORD_CWORD,
3067 /* 210 */ CWORD_CWORD_CWORD_CWORD,
3068 /* 211 */ CWORD_CWORD_CWORD_CWORD,
3069 /* 212 */ CWORD_CWORD_CWORD_CWORD,
3070 /* 213 */ CWORD_CWORD_CWORD_CWORD,
3071 /* 214 */ CWORD_CWORD_CWORD_CWORD,
3072 /* 215 */ CWORD_CWORD_CWORD_CWORD,
3073 /* 216 */ CWORD_CWORD_CWORD_CWORD,
3074 /* 217 */ CWORD_CWORD_CWORD_CWORD,
3075 /* 218 */ CWORD_CWORD_CWORD_CWORD,
3076 /* 219 */ CWORD_CWORD_CWORD_CWORD,
3077 /* 220 */ CWORD_CWORD_CWORD_CWORD,
3078 /* 221 */ CWORD_CWORD_CWORD_CWORD,
3079 /* 222 */ CWORD_CWORD_CWORD_CWORD,
3080 /* 223 */ CWORD_CWORD_CWORD_CWORD,
3081 /* 224 */ CWORD_CWORD_CWORD_CWORD,
3082 /* 225 */ CWORD_CWORD_CWORD_CWORD,
3083 /* 226 */ CWORD_CWORD_CWORD_CWORD,
3084 /* 227 */ CWORD_CWORD_CWORD_CWORD,
3085 /* 228 */ CWORD_CWORD_CWORD_CWORD,
3086 /* 229 */ CWORD_CWORD_CWORD_CWORD,
3087 /* 230 */ CWORD_CWORD_CWORD_CWORD,
3088 /* 231 */ CWORD_CWORD_CWORD_CWORD,
3089 /* 232 */ CWORD_CWORD_CWORD_CWORD,
3090 /* 233 */ CWORD_CWORD_CWORD_CWORD,
3091 /* 234 */ CWORD_CWORD_CWORD_CWORD,
3092 /* 235 */ CWORD_CWORD_CWORD_CWORD,
3093 /* 236 */ CWORD_CWORD_CWORD_CWORD,
3094 /* 237 */ CWORD_CWORD_CWORD_CWORD,
3095 /* 238 */ CWORD_CWORD_CWORD_CWORD,
3096 /* 239 */ CWORD_CWORD_CWORD_CWORD,
3097 /* 230 */ CWORD_CWORD_CWORD_CWORD,
3098 /* 241 */ CWORD_CWORD_CWORD_CWORD,
3099 /* 242 */ CWORD_CWORD_CWORD_CWORD,
3100 /* 243 */ CWORD_CWORD_CWORD_CWORD,
3101 /* 244 */ CWORD_CWORD_CWORD_CWORD,
3102 /* 245 */ CWORD_CWORD_CWORD_CWORD,
3103 /* 246 */ CWORD_CWORD_CWORD_CWORD,
3104 /* 247 */ CWORD_CWORD_CWORD_CWORD,
3105 /* 248 */ CWORD_CWORD_CWORD_CWORD,
3106 /* 249 */ CWORD_CWORD_CWORD_CWORD,
3107 /* 250 */ CWORD_CWORD_CWORD_CWORD,
3108 /* 251 */ CWORD_CWORD_CWORD_CWORD,
3109 /* 252 */ CWORD_CWORD_CWORD_CWORD,
3110 /* 253 */ CWORD_CWORD_CWORD_CWORD,
3111 /* 254 */ CWORD_CWORD_CWORD_CWORD,
3112 /* 255 */ CWORD_CWORD_CWORD_CWORD,
3113 /* PEOF */ CENDFILE_CENDFILE_CENDFILE_CENDFILE,
3114 # if ENABLE_ASH_ALIAS
3115 /* PEOA */ CSPCL_CIGN_CIGN_CIGN,
3119 # define SIT(c, syntax) ((S_I_T[syntax_index_table[c]] >> ((syntax)*4)) & 0xf)
3121 #endif /* !USE_SIT_FUNCTION */
3124 /* ============ Alias handling */
3126 #if ENABLE_ASH_ALIAS
3128 #define ALIASINUSE 1
3139 static struct alias **atab; // [ATABSIZE];
3140 #define INIT_G_alias() do { \
3141 atab = xzalloc(ATABSIZE * sizeof(atab[0])); \
3145 static struct alias **
3146 __lookupalias(const char *name) {
3147 unsigned int hashval;
3154 ch = (unsigned char)*p;
3158 ch = (unsigned char)*++p;
3160 app = &atab[hashval % ATABSIZE];
3162 for (; *app; app = &(*app)->next) {
3163 if (strcmp(name, (*app)->name) == 0) {
3171 static struct alias *
3172 lookupalias(const char *name, int check)
3174 struct alias *ap = *__lookupalias(name);
3176 if (check && ap && (ap->flag & ALIASINUSE))
3181 static struct alias *
3182 freealias(struct alias *ap)
3186 if (ap->flag & ALIASINUSE) {
3187 ap->flag |= ALIASDEAD;
3199 setalias(const char *name, const char *val)
3201 struct alias *ap, **app;
3203 app = __lookupalias(name);
3207 if (!(ap->flag & ALIASINUSE)) {
3210 ap->val = ckstrdup(val);
3211 ap->flag &= ~ALIASDEAD;
3214 ap = ckzalloc(sizeof(struct alias));
3215 ap->name = ckstrdup(name);
3216 ap->val = ckstrdup(val);
3217 /*ap->flag = 0; - ckzalloc did it */
3218 /*ap->next = NULL;*/
3225 unalias(const char *name)
3229 app = __lookupalias(name);
3233 *app = freealias(*app);
3244 struct alias *ap, **app;
3248 for (i = 0; i < ATABSIZE; i++) {
3250 for (ap = *app; ap; ap = *app) {
3251 *app = freealias(*app);
3261 printalias(const struct alias *ap)
3263 out1fmt("%s=%s\n", ap->name, single_quote(ap->val));
3267 * TODO - sort output
3269 static int FAST_FUNC
3270 aliascmd(int argc UNUSED_PARAM, char **argv)
3279 for (i = 0; i < ATABSIZE; i++) {
3280 for (ap = atab[i]; ap; ap = ap->next) {
3286 while ((n = *++argv) != NULL) {
3287 v = strchr(n+1, '=');
3288 if (v == NULL) { /* n+1: funny ksh stuff */
3289 ap = *__lookupalias(n);
3291 fprintf(stderr, "%s: %s not found\n", "alias", n);
3304 static int FAST_FUNC
3305 unaliascmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
3309 while ((i = nextopt("a")) != '\0') {
3315 for (i = 0; *argptr; argptr++) {
3316 if (unalias(*argptr)) {
3317 fprintf(stderr, "%s: %s not found\n", "unalias", *argptr);
3325 #endif /* ASH_ALIAS */
3328 /* ============ jobs.c */
3330 /* Mode argument to forkshell. Don't change FORK_FG or FORK_BG. */
3333 #define FORK_NOJOB 2
3335 /* mode flags for showjob(s) */
3336 #define SHOW_ONLY_PGID 0x01 /* show only pgid (jobs -p) */
3337 #define SHOW_PIDS 0x02 /* show individual pids, not just one line per job */
3338 #define SHOW_CHANGED 0x04 /* only jobs whose state has changed */
3339 #define SHOW_STDERR 0x08 /* print to stderr (else stdout) */
3342 * A job structure contains information about a job. A job is either a
3343 * single process or a set of processes contained in a pipeline. In the
3344 * latter case, pidlist will be non-NULL, and will point to a -1 terminated
3348 pid_t ps_pid; /* process id */
3349 int ps_status; /* last process status from wait() */
3350 char *ps_cmd; /* text of command being run */
3354 struct procstat ps0; /* status of process */
3355 struct procstat *ps; /* status or processes when more than one */
3357 int stopstatus; /* status of a stopped job */
3360 nprocs: 16, /* number of processes */
3362 #define JOBRUNNING 0 /* at least one proc running */
3363 #define JOBSTOPPED 1 /* all procs are stopped */
3364 #define JOBDONE 2 /* all procs are completed */
3366 sigint: 1, /* job was killed by SIGINT */
3367 jobctl: 1, /* job running under job control */
3369 waited: 1, /* true if this entry has been waited for */
3370 used: 1, /* true if this entry is in used */
3371 changed: 1; /* true if status has changed */
3372 struct job *prev_job; /* previous job */
3375 static struct job *makejob(/*union node *,*/ int);
3376 static int forkshell(struct job *, union node *, int);
3377 static int waitforjob(struct job *);
3380 enum { doing_jobctl = 0 };
3381 #define setjobctl(on) do {} while (0)
3383 static smallint doing_jobctl; //references:8
3384 static void setjobctl(int);
3391 ignoresig(int signo)
3393 /* Avoid unnecessary system calls. Is it already SIG_IGNed? */
3394 if (sigmode[signo - 1] != S_IGN && sigmode[signo - 1] != S_HARD_IGN) {
3395 /* No, need to do it */
3396 signal(signo, SIG_IGN);
3398 sigmode[signo - 1] = S_HARD_IGN;
3402 * Only one usage site - in setsignal()
3405 signal_handler(int signo)
3407 gotsig[signo - 1] = 1;
3409 if (signo == SIGINT && !trap[SIGINT]) {
3410 if (!suppress_int) {
3412 raise_interrupt(); /* does not return */
3416 pending_sig = signo;
3421 * Set the signal handler for the specified signal. The routine figures
3422 * out what it should be set to.
3425 setsignal(int signo)
3428 char cur_act, new_act;
3429 struct sigaction act;
3433 if (t != NULL) { /* trap for this sig is set */
3435 if (t[0] == '\0') /* trap is "": ignore this sig */
3439 if (rootshell && new_act == S_DFL) {
3442 if (iflag || minusc || sflag == 0)
3451 * "In all cases, bash ignores SIGQUIT. Non-builtin
3452 * commands run by bash have signal handlers
3453 * set to the values inherited by the shell
3454 * from its parent". */
3470 //TODO: if !rootshell, we reset SIGQUIT to DFL,
3471 //whereas we have to restore it to what shell got on entry
3472 //from the parent. See comment above
3474 t = &sigmode[signo - 1];
3477 /* current setting is not yet known */
3478 if (sigaction(signo, NULL, &act)) {
3479 /* pretend it worked; maybe we should give a warning,
3480 * but other shells don't. We don't alter sigmode,
3481 * so we retry every time.
3482 * btw, in Linux it never fails. --vda */
3485 if (act.sa_handler == SIG_IGN) {
3486 cur_act = S_HARD_IGN;
3488 && (signo == SIGTSTP || signo == SIGTTIN || signo == SIGTTOU)
3490 cur_act = S_IGN; /* don't hard ignore these */
3494 if (cur_act == S_HARD_IGN || cur_act == new_act)
3497 act.sa_handler = SIG_DFL;
3500 act.sa_handler = signal_handler;
3503 act.sa_handler = SIG_IGN;
3507 /* flags and mask matter only if !DFL and !IGN, but we do it
3508 * for all cases for more deterministic behavior:
3511 sigfillset(&act.sa_mask);
3513 sigaction_set(signo, &act);
3518 /* mode flags for set_curjob */
3519 #define CUR_DELETE 2
3520 #define CUR_RUNNING 1
3521 #define CUR_STOPPED 0
3523 /* mode flags for dowait */
3524 #define DOWAIT_NONBLOCK WNOHANG
3525 #define DOWAIT_BLOCK 0
3528 /* pgrp of shell on invocation */
3529 static int initialpgrp; //references:2
3530 static int ttyfd = -1; //5
3533 static struct job *jobtab; //5
3535 static unsigned njobs; //4
3537 static struct job *curjob; //lots
3538 /* number of presumed living untracked jobs */
3539 static int jobless; //4
3542 set_curjob(struct job *jp, unsigned mode)
3545 struct job **jpp, **curp;
3547 /* first remove from list */
3548 jpp = curp = &curjob;
3553 jpp = &jp1->prev_job;
3555 *jpp = jp1->prev_job;
3557 /* Then re-insert in correct position */
3565 /* job being deleted */
3568 /* newly created job or backgrounded job,
3569 * put after all stopped jobs.
3574 if (!jp1 || jp1->state != JOBSTOPPED)
3577 jpp = &jp1->prev_job;
3583 /* newly stopped job - becomes curjob */
3584 jp->prev_job = *jpp;
3592 jobno(const struct job *jp)
3594 return jp - jobtab + 1;
3599 * Convert a job name to a job structure.
3602 #define getjob(name, getctl) getjob(name)
3605 getjob(const char *name, int getctl)
3609 const char *err_msg = "%s: no such job";
3613 char *(*match)(const char *, const char *);
3628 if (c == '+' || c == '%') {
3630 err_msg = "No current job";
3636 err_msg = "No previous job";
3647 jp = jobtab + num - 1;
3662 if (match(jp->ps[0].ps_cmd, p)) {
3666 err_msg = "%s: ambiguous";
3676 err_msg = "job %s not created under job control";
3677 if (getctl && jp->jobctl == 0)
3682 ash_msg_and_raise_error(err_msg, name);
3686 * Mark a job structure as unused.
3689 freejob(struct job *jp)
3691 struct procstat *ps;
3695 for (i = jp->nprocs, ps = jp->ps; --i >= 0; ps++) {
3696 if (ps->ps_cmd != nullstr)
3699 if (jp->ps != &jp->ps0)
3702 set_curjob(jp, CUR_DELETE);
3708 xtcsetpgrp(int fd, pid_t pgrp)
3710 if (tcsetpgrp(fd, pgrp))
3711 ash_msg_and_raise_error("can't set tty process group (%m)");
3715 * Turn job control on and off.
3717 * Note: This code assumes that the third arg to ioctl is a character
3718 * pointer, which is true on Berkeley systems but not System V. Since
3719 * System V doesn't have job control yet, this isn't a problem now.
3721 * Called with interrupts off.
3729 if (on == doing_jobctl || rootshell == 0)
3733 ofd = fd = open(_PATH_TTY, O_RDWR);
3735 /* BTW, bash will try to open(ttyname(0)) if open("/dev/tty") fails.
3736 * That sometimes helps to acquire controlling tty.
3737 * Obviously, a workaround for bugs when someone
3738 * failed to provide a controlling tty to bash! :) */
3744 fd = fcntl(fd, F_DUPFD, 10);
3749 /* fd is a tty at this point */
3750 close_on_exec_on(fd);
3751 while (1) { /* while we are in the background */
3752 pgrp = tcgetpgrp(fd);
3755 ash_msg("can't access tty; job control turned off");
3759 if (pgrp == getpgrp())
3770 xtcsetpgrp(fd, pgrp);
3772 /* turning job control off */
3775 /* was xtcsetpgrp, but this can make exiting ash
3776 * loop forever if pty is already deleted */
3777 tcsetpgrp(fd, pgrp);
3791 static int FAST_FUNC
3792 killcmd(int argc, char **argv)
3794 if (argv[1] && strcmp(argv[1], "-l") != 0) {
3797 if (argv[i][0] == '%') {
3799 * "kill %N" - job kill
3800 * Converting to pgrp / pid kill
3806 jp = getjob(argv[i], 0);
3808 * In jobs started under job control, we signal
3809 * entire process group by kill -PGRP_ID.
3810 * This happens, f.e., in interactive shell.
3812 * Otherwise, we signal each child via
3813 * kill PID1 PID2 PID3.
3815 * sh -c 'sleep 1|sleep 1 & kill %1'
3816 * sh -c 'true|sleep 2 & sleep 1; kill %1'
3817 * sh -c 'true|sleep 1 & sleep 2; kill %1'
3819 n = jp->nprocs; /* can't be 0 (I hope) */
3822 dst = alloca(n * sizeof(int)*4);
3824 for (j = 0; j < n; j++) {
3825 struct procstat *ps = &jp->ps[j];
3826 /* Skip non-running and not-stopped members
3827 * (i.e. dead members) of the job
3829 if (ps->ps_status != -1 && !WIFSTOPPED(ps->ps_status))
3832 * kill_main has matching code to expect
3833 * leading space. Needed to not confuse
3834 * negative pids with "kill -SIGNAL_NO" syntax
3836 dst += sprintf(dst, jp->jobctl ? " -%u" : " %u", (int)ps->ps_pid);
3840 } while (argv[++i]);
3842 return kill_main(argc, argv);
3846 showpipe(struct job *jp /*, FILE *out*/)
3848 struct procstat *ps;
3849 struct procstat *psend;
3851 psend = jp->ps + jp->nprocs;
3852 for (ps = jp->ps + 1; ps < psend; ps++)
3853 printf(" | %s", ps->ps_cmd);
3854 newline_and_flush(stdout);
3855 flush_stdout_stderr();
3860 restartjob(struct job *jp, int mode)
3862 struct procstat *ps;
3868 if (jp->state == JOBDONE)
3870 jp->state = JOBRUNNING;
3871 pgid = jp->ps[0].ps_pid;
3872 if (mode == FORK_FG)
3873 xtcsetpgrp(ttyfd, pgid);
3874 killpg(pgid, SIGCONT);
3878 if (WIFSTOPPED(ps->ps_status)) {
3884 status = (mode == FORK_FG) ? waitforjob(jp) : 0;
3889 static int FAST_FUNC
3890 fg_bgcmd(int argc UNUSED_PARAM, char **argv)
3896 mode = (**argv == 'f') ? FORK_FG : FORK_BG;
3900 jp = getjob(*argv, 1);
3901 if (mode == FORK_BG) {
3902 set_curjob(jp, CUR_RUNNING);
3903 printf("[%d] ", jobno(jp));
3905 out1str(jp->ps[0].ps_cmd);
3906 showpipe(jp /*, stdout*/);
3907 retval = restartjob(jp, mode);
3908 } while (*argv && *++argv);
3914 sprint_status48(char *s, int status, int sigonly)
3920 if (!WIFEXITED(status)) {
3921 if (JOBS && WIFSTOPPED(status))
3922 st = WSTOPSIG(status);
3924 st = WTERMSIG(status);
3926 if (st == SIGINT || st == SIGPIPE)
3928 if (JOBS && WIFSTOPPED(status))
3932 //TODO: use bbox's get_signame? strsignal adds ~600 bytes to text+rodata
3933 col = fmtstr(s, 32, strsignal(st));
3934 if (WCOREDUMP(status)) {
3935 strcpy(s + col, " (core dumped)");
3936 col += sizeof(" (core dumped)")-1;
3938 } else if (!sigonly) {
3939 st = WEXITSTATUS(status);
3940 col = fmtstr(s, 16, (st ? "Done(%d)" : "Done"), st);
3947 dowait(int wait_flags, struct job *job)
3952 struct job *thisjob;
3954 TRACE(("dowait(0x%x) called\n", wait_flags));
3956 /* Do a wait system call. If job control is compiled in, we accept
3957 * stopped processes. wait_flags may have WNOHANG, preventing blocking.
3958 * NB: _not_ safe_waitpid, we need to detect EINTR */
3960 wait_flags |= WUNTRACED;
3961 pid = waitpid(-1, &status, wait_flags);
3962 TRACE(("wait returns pid=%d, status=0x%x, errno=%d(%s)\n",
3963 pid, status, errno, strerror(errno)));
3969 for (jp = curjob; jp; jp = jp->prev_job) {
3971 struct procstat *ps;
3972 struct procstat *psend;
3973 if (jp->state == JOBDONE)
3977 psend = ps + jp->nprocs;
3979 if (ps->ps_pid == pid) {
3980 TRACE(("Job %d: changing status of proc %d "
3981 "from 0x%x to 0x%x\n",
3982 jobno(jp), pid, ps->ps_status, status));
3983 ps->ps_status = status;
3986 if (ps->ps_status == -1)
3987 jobstate = JOBRUNNING;
3989 if (jobstate == JOBRUNNING)
3991 if (WIFSTOPPED(ps->ps_status)) {
3992 jp->stopstatus = ps->ps_status;
3993 jobstate = JOBSTOPPED;
3996 } while (++ps < psend);
4000 /* Found the job where one of its processes changed its state.
4001 * Is there at least one live and running process in this job? */
4002 if (jobstate != JOBRUNNING) {
4003 /* No. All live processes in the job are stopped
4004 * (JOBSTOPPED) or there are no live processes (JOBDONE)
4006 thisjob->changed = 1;
4007 if (thisjob->state != jobstate) {
4008 TRACE(("Job %d: changing state from %d to %d\n",
4009 jobno(thisjob), thisjob->state, jobstate));
4010 thisjob->state = jobstate;
4012 if (jobstate == JOBSTOPPED)
4013 set_curjob(thisjob, CUR_STOPPED);
4019 /* The process wasn't found in job list */
4020 if (JOBS && !WIFSTOPPED(status))
4025 if (thisjob && thisjob == job) {
4029 len = sprint_status48(s, status, 1);
4040 blocking_wait_with_raise_on_sig(void)
4042 pid_t pid = dowait(DOWAIT_BLOCK, NULL);
4043 if (pid <= 0 && pending_sig)
4044 raise_exception(EXSIG);
4050 showjob(struct job *jp, int mode)
4052 struct procstat *ps;
4053 struct procstat *psend;
4056 char s[16 + 16 + 48];
4057 FILE *out = (mode & SHOW_STDERR ? stderr : stdout);
4061 if (mode & SHOW_ONLY_PGID) { /* jobs -p */
4062 /* just output process (group) id of pipeline */
4063 fprintf(out, "%d\n", ps->ps_pid);
4067 col = fmtstr(s, 16, "[%d] ", jobno(jp));
4072 else if (curjob && jp == curjob->prev_job)
4075 if (mode & SHOW_PIDS)
4076 col += fmtstr(s + col, 16, "%d ", ps->ps_pid);
4078 psend = ps + jp->nprocs;
4080 if (jp->state == JOBRUNNING) {
4081 strcpy(s + col, "Running");
4082 col += sizeof("Running") - 1;
4084 int status = psend[-1].ps_status;
4085 if (jp->state == JOBSTOPPED)
4086 status = jp->stopstatus;
4087 col += sprint_status48(s + col, status, 0);
4089 /* By now, "[JOBID]* [maybe PID] STATUS" is printed */
4091 /* This loop either prints "<cmd1> | <cmd2> | <cmd3>" line
4092 * or prints several "PID | <cmdN>" lines,
4093 * depending on SHOW_PIDS bit.
4094 * We do not print status of individual processes
4095 * between PID and <cmdN>. bash does it, but not very well:
4096 * first line shows overall job status, not process status,
4097 * making it impossible to know 1st process status.
4101 /* for each process */
4104 if (mode & SHOW_PIDS)
4105 col = fmtstr(s, 48, "\n%*c%d ", indent_col, ' ', ps->ps_pid) - 1;
4107 fprintf(out, "%s%*c%s%s",
4109 33 - col >= 0 ? 33 - col : 0, ' ',
4110 ps == jp->ps ? "" : "| ",
4113 } while (++ps != psend);
4114 newline_and_flush(out);
4118 if (jp->state == JOBDONE) {
4119 TRACE(("showjob: freeing job %d\n", jobno(jp)));
4125 * Print a list of jobs. If "change" is nonzero, only print jobs whose
4126 * statuses have changed since the last call to showjobs.
4133 TRACE(("showjobs(0x%x) called\n", mode));
4135 /* Handle all finished jobs */
4136 while (dowait(DOWAIT_NONBLOCK, NULL) > 0)
4139 for (jp = curjob; jp; jp = jp->prev_job) {
4140 if (!(mode & SHOW_CHANGED) || jp->changed) {
4146 static int FAST_FUNC
4147 jobscmd(int argc UNUSED_PARAM, char **argv)
4152 while ((m = nextopt("lp")) != '\0') {
4156 mode |= SHOW_ONLY_PGID;
4162 showjob(getjob(*argv, 0), mode);
4172 /* Called only on finished or stopped jobs (no members are running) */
4174 getstatus(struct job *job)
4178 struct procstat *ps;
4180 /* Fetch last member's status */
4181 ps = job->ps + job->nprocs - 1;
4182 status = ps->ps_status;
4184 /* "set -o pipefail" mode: use last _nonzero_ status */
4185 while (status == 0 && --ps >= job->ps)
4186 status = ps->ps_status;
4189 retval = WEXITSTATUS(status);
4190 if (!WIFEXITED(status)) {
4192 retval = WSTOPSIG(status);
4193 if (!WIFSTOPPED(status))
4196 /* XXX: limits number of signals */
4197 retval = WTERMSIG(status);
4199 if (retval == SIGINT)
4205 TRACE(("getstatus: job %d, nproc %d, status 0x%x, retval 0x%x\n",
4206 jobno(job), job->nprocs, status, retval));
4210 static int FAST_FUNC
4211 waitcmd(int argc UNUSED_PARAM, char **argv)
4218 raise_exception(EXSIG);
4225 /* wait for all jobs */
4229 if (!jp) /* no running procs */
4231 if (jp->state == JOBRUNNING)
4236 blocking_wait_with_raise_on_sig();
4238 * "When bash is waiting for an asynchronous command via
4239 * the wait builtin, the reception of a signal for which a trap
4240 * has been set will cause the wait builtin to return immediately
4241 * with an exit status greater than 128, immediately after which
4242 * the trap is executed."
4244 * blocking_wait_with_raise_on_sig raises signal handlers
4245 * if it gets no pid (pid < 0). However,
4246 * if child sends us a signal *and immediately exits*,
4247 * blocking_wait_with_raise_on_sig gets pid > 0
4248 * and does not handle pending_sig. Check this case: */
4250 raise_exception(EXSIG);
4256 if (**argv != '%') {
4257 pid_t pid = number(*argv);
4262 if (job->ps[job->nprocs - 1].ps_pid == pid)
4264 job = job->prev_job;
4267 job = getjob(*argv, 0);
4269 /* loop until process terminated or stopped */
4270 while (job->state == JOBRUNNING)
4271 blocking_wait_with_raise_on_sig();
4273 retval = getstatus(job);
4286 struct job *jp, *jq;
4288 len = njobs * sizeof(*jp);
4290 jp = ckrealloc(jq, len + 4 * sizeof(*jp));
4292 offset = (char *)jp - (char *)jq;
4294 /* Relocate pointers */
4297 jq = (struct job *)((char *)jq + l);
4301 #define joff(p) ((struct job *)((char *)(p) + l))
4302 #define jmove(p) (p) = (void *)((char *)(p) + offset)
4303 if (joff(jp)->ps == &jq->ps0)
4304 jmove(joff(jp)->ps);
4305 if (joff(jp)->prev_job)
4306 jmove(joff(jp)->prev_job);
4316 jp = (struct job *)((char *)jp + len);
4320 } while (--jq >= jp);
4325 * Return a new job structure.
4326 * Called with interrupts off.
4329 makejob(/*union node *node,*/ int nprocs)
4334 for (i = njobs, jp = jobtab; ; jp++) {
4341 if (jp->state != JOBDONE || !jp->waited)
4350 memset(jp, 0, sizeof(*jp));
4352 /* jp->jobctl is a bitfield.
4353 * "jp->jobctl |= jobctl" likely to give awful code */
4357 jp->prev_job = curjob;
4362 jp->ps = ckmalloc(nprocs * sizeof(struct procstat));
4364 TRACE(("makejob(%d) returns %%%d\n", nprocs,
4371 * Return a string identifying a command (to be printed by the
4374 static char *cmdnextc;
4377 cmdputs(const char *s)
4379 static const char vstype[VSTYPE + 1][3] = {
4380 "", "}", "-", "+", "?", "=",
4381 "%", "%%", "#", "##"
4382 IF_ASH_BASH_COMPAT(, ":", "/", "//")
4385 const char *p, *str;
4389 unsigned char subtype = 0;
4393 nextc = makestrspace((strlen(s) + 1) * 8, cmdnextc);
4395 while ((c = *p++) != '\0') {
4403 if ((subtype & VSTYPE) == VSLENGTH)
4409 str = "\"}" + !(quoted & 1);
4416 #if ENABLE_SH_MATH_SUPPORT
4431 if ((subtype & VSTYPE) != VSNORMAL)
4433 str = vstype[subtype & VSTYPE];
4434 if (subtype & VSNUL)
4443 /* These can only happen inside quotes */
4456 while ((c = *str++) != '\0') {
4459 } /* while *p++ not NUL */
4462 USTPUTC('"', nextc);
4468 /* cmdtxt() and cmdlist() call each other */
4469 static void cmdtxt(union node *n);
4472 cmdlist(union node *np, int sep)
4474 for (; np; np = np->narg.next) {
4478 if (sep && np->narg.next)
4484 cmdtxt(union node *n)
4487 struct nodelist *lp;
4498 lp = n->npipe.cmdlist;
4516 cmdtxt(n->nbinary.ch1);
4532 cmdtxt(n->nif.test);
4534 if (n->nif.elsepart) {
4535 cmdtxt(n->nif.ifpart);
4537 n = n->nif.elsepart;
4555 cmdtxt(n->nbinary.ch1);
4565 cmdputs(n->nfor.var);
4567 cmdlist(n->nfor.args, 1);
4572 cmdputs(n->narg.text);
4576 cmdlist(n->ncmd.args, 1);
4577 cmdlist(n->ncmd.redirect, 0);
4590 cmdputs(n->ncase.expr->narg.text);
4592 for (np = n->ncase.cases; np; np = np->nclist.next) {
4593 cmdtxt(np->nclist.pattern);
4595 cmdtxt(np->nclist.body);
4609 #if ENABLE_ASH_BASH_COMPAT
4624 cmdputs(utoa(n->nfile.fd));
4626 if (n->type == NTOFD || n->type == NFROMFD) {
4627 cmdputs(utoa(n->ndup.dupfd));
4636 commandtext(union node *n)
4640 STARTSTACKSTR(cmdnextc);
4642 name = stackblock();
4643 TRACE(("commandtext: name %p, end %p\n\t\"%s\"\n",
4644 name, cmdnextc, cmdnextc));
4645 return ckstrdup(name);
4650 * Fork off a subshell. If we are doing job control, give the subshell its
4651 * own process group. Jp is a job structure that the job is to be added to.
4652 * N is the command that will be evaluated by the child. Both jp and n may
4653 * be NULL. The mode parameter can be one of the following:
4654 * FORK_FG - Fork off a foreground process.
4655 * FORK_BG - Fork off a background process.
4656 * FORK_NOJOB - Like FORK_FG, but don't give the process its own
4657 * process group even if job control is on.
4659 * When job control is turned off, background processes have their standard
4660 * input redirected to /dev/null (except for the second and later processes
4663 * Called with interrupts off.
4666 * Clear traps on a fork.
4673 for (tp = trap; tp < &trap[NSIG]; tp++) {
4674 if (*tp && **tp) { /* trap not NULL or "" (SIG_IGN) */
4676 if (trap_ptr == trap)
4678 /* else: it "belongs" to trap_ptr vector, don't free */
4680 if ((tp - trap) != 0)
4681 setsignal(tp - trap);
4688 /* Lives far away from here, needed for forkchild */
4689 static void closescript(void);
4691 /* Called after fork(), in child */
4692 static NOINLINE void
4693 forkchild(struct job *jp, union node *n, int mode)
4697 TRACE(("Child shell %d\n", getpid()));
4701 /* man bash: "Non-builtin commands run by bash have signal handlers
4702 * set to the values inherited by the shell from its parent".
4703 * Do we do it correctly? */
4707 if (mode == FORK_NOJOB /* is it `xxx` ? */
4708 && n && n->type == NCMD /* is it single cmd? */
4709 /* && n->ncmd.args->type == NARG - always true? */
4710 && n->ncmd.args && strcmp(n->ncmd.args->narg.text, "trap") == 0
4711 && n->ncmd.args->narg.next == NULL /* "trap" with no arguments */
4712 /* && n->ncmd.args->narg.backquote == NULL - do we need to check this? */
4714 TRACE(("Trap hack\n"));
4715 /* Awful hack for `trap` or $(trap).
4717 * http://www.opengroup.org/onlinepubs/009695399/utilities/trap.html
4718 * contains an example where "trap" is executed in a subshell:
4720 * save_traps=$(trap)
4722 * eval "$save_traps"
4724 * Standard does not say that "trap" in subshell shall print
4725 * parent shell's traps. It only says that its output
4726 * must have suitable form, but then, in the above example
4727 * (which is not supposed to be normative), it implies that.
4729 * bash (and probably other shell) does implement it
4730 * (traps are reset to defaults, but "trap" still shows them),
4731 * but as a result, "trap" logic is hopelessly messed up:
4734 * trap -- 'echo Ho' SIGWINCH <--- we have a handler
4735 * # (trap) <--- trap is in subshell - no output (correct, traps are reset)
4736 * # true | trap <--- trap is in subshell - no output (ditto)
4737 * # echo `true | trap` <--- in subshell - output (but traps are reset!)
4738 * trap -- 'echo Ho' SIGWINCH
4739 * # echo `(trap)` <--- in subshell in subshell - output
4740 * trap -- 'echo Ho' SIGWINCH
4741 * # echo `true | (trap)` <--- in subshell in subshell in subshell - output!
4742 * trap -- 'echo Ho' SIGWINCH
4744 * The rules when to forget and when to not forget traps
4745 * get really complex and nonsensical.
4747 * Our solution: ONLY bare $(trap) or `trap` is special.
4749 /* Save trap handler strings for trap builtin to print */
4750 trap_ptr = xmemdup(trap, sizeof(trap));
4751 /* Fall through into clearing traps */
4755 /* do job control only in root shell */
4757 if (mode != FORK_NOJOB && jp->jobctl && oldlvl == 0) {
4760 if (jp->nprocs == 0)
4763 pgrp = jp->ps[0].ps_pid;
4764 /* this can fail because we are doing it in the parent also */
4766 if (mode == FORK_FG)
4767 xtcsetpgrp(ttyfd, pgrp);
4772 if (mode == FORK_BG) {
4773 /* man bash: "When job control is not in effect,
4774 * asynchronous commands ignore SIGINT and SIGQUIT" */
4777 if (jp->nprocs == 0) {
4779 if (open(bb_dev_null, O_RDONLY) != 0)
4780 ash_msg_and_raise_error("can't open '%s'", bb_dev_null);
4784 if (iflag) { /* why if iflag only? */
4789 * "In all cases, bash ignores SIGQUIT. Non-builtin
4790 * commands run by bash have signal handlers
4791 * set to the values inherited by the shell
4793 * Take care of the second rule: */
4797 if (n && n->type == NCMD
4798 && n->ncmd.args && strcmp(n->ncmd.args->narg.text, "jobs") == 0
4800 TRACE(("Job hack\n"));
4801 /* "jobs": we do not want to clear job list for it,
4802 * instead we remove only _its_ own_ job from job list.
4803 * This makes "jobs .... | cat" more useful.
4809 for (jp = curjob; jp; jp = jp->prev_job)
4814 /* Called after fork(), in parent */
4816 #define forkparent(jp, n, mode, pid) forkparent(jp, mode, pid)
4819 forkparent(struct job *jp, union node *n, int mode, pid_t pid)
4821 TRACE(("In parent shell: child = %d\n", pid));
4823 while (jobless && dowait(DOWAIT_NONBLOCK, NULL) > 0)
4829 if (mode != FORK_NOJOB && jp->jobctl) {
4832 if (jp->nprocs == 0)
4835 pgrp = jp->ps[0].ps_pid;
4836 /* This can fail because we are doing it in the child also */
4840 if (mode == FORK_BG) {
4841 backgndpid = pid; /* set $! */
4842 set_curjob(jp, CUR_RUNNING);
4845 struct procstat *ps = &jp->ps[jp->nprocs++];
4848 ps->ps_cmd = nullstr;
4850 if (doing_jobctl && n)
4851 ps->ps_cmd = commandtext(n);
4857 forkshell(struct job *jp, union node *n, int mode)
4861 TRACE(("forkshell(%%%d, %p, %d) called\n", jobno(jp), n, mode));
4864 TRACE(("Fork failed, errno=%d", errno));
4867 ash_msg_and_raise_error("can't fork");
4870 CLEAR_RANDOM_T(&random_gen); /* or else $RANDOM repeats in child */
4871 forkchild(jp, n, mode);
4873 forkparent(jp, n, mode, pid);
4879 * Wait for job to finish.
4881 * Under job control we have the problem that while a child process
4882 * is running interrupts generated by the user are sent to the child
4883 * but not to the shell. This means that an infinite loop started by
4884 * an interactive user may be hard to kill. With job control turned off,
4885 * an interactive user may place an interactive program inside a loop.
4886 * If the interactive program catches interrupts, the user doesn't want
4887 * these interrupts to also abort the loop. The approach we take here
4888 * is to have the shell ignore interrupt signals while waiting for a
4889 * foreground process to terminate, and then send itself an interrupt
4890 * signal if the child process was terminated by an interrupt signal.
4891 * Unfortunately, some programs want to do a bit of cleanup and then
4892 * exit on interrupt; unless these processes terminate themselves by
4893 * sending a signal to themselves (instead of calling exit) they will
4894 * confuse this approach.
4896 * Called with interrupts off.
4899 waitforjob(struct job *jp)
4903 TRACE(("waitforjob(%%%d) called\n", jobno(jp)));
4906 while (jp->state == JOBRUNNING) {
4907 /* In non-interactive shells, we _can_ get
4908 * a keyboard signal here and be EINTRed,
4909 * but we just loop back, waiting for command to complete.
4912 * "If bash is waiting for a command to complete and receives
4913 * a signal for which a trap has been set, the trap
4914 * will not be executed until the command completes."
4916 * Reality is that even if trap is not set, bash
4917 * will not act on the signal until command completes.
4918 * Try this. sleep5intoff.c:
4919 * #include <signal.h>
4920 * #include <unistd.h>
4923 * sigemptyset(&set);
4924 * sigaddset(&set, SIGINT);
4925 * sigaddset(&set, SIGQUIT);
4926 * sigprocmask(SIG_BLOCK, &set, NULL);
4930 * $ bash -c './sleep5intoff; echo hi'
4931 * ^C^C^C^C <--- pressing ^C once a second
4933 * $ bash -c './sleep5intoff; echo hi'
4934 * ^\^\^\^\hi <--- pressing ^\ (SIGQUIT)
4937 dowait(DOWAIT_BLOCK, jp);
4944 xtcsetpgrp(ttyfd, rootpid);
4946 * This is truly gross.
4947 * If we're doing job control, then we did a TIOCSPGRP which
4948 * caused us (the shell) to no longer be in the controlling
4949 * session -- so we wouldn't have seen any ^C/SIGINT. So, we
4950 * intuit from the subprocess exit status whether a SIGINT
4951 * occurred, and if so interrupt ourselves. Yuck. - mycroft
4953 if (jp->sigint) /* TODO: do the same with all signals */
4954 raise(SIGINT); /* ... by raise(jp->sig) instead? */
4956 if (jp->state == JOBDONE)
4963 * return 1 if there are stopped jobs, otherwise 0
4975 if (jp && jp->state == JOBSTOPPED) {
4976 out2str("You have stopped jobs.\n");
4985 /* ============ redir.c
4987 * Code for dealing with input/output redirection.
4992 #define EMPTY -2 /* marks an unused slot in redirtab */
4993 #define CLOSED -3 /* marks a slot of previously-closed fd */
4996 * Open a file in noclobber mode.
4997 * The code was copied from bash.
5000 noclobberopen(const char *fname)
5003 struct stat finfo, finfo2;
5006 * If the file exists and is a regular file, return an error
5009 r = stat(fname, &finfo);
5010 if (r == 0 && S_ISREG(finfo.st_mode)) {
5016 * If the file was not present (r != 0), make sure we open it
5017 * exclusively so that if it is created before we open it, our open
5018 * will fail. Make sure that we do not truncate an existing file.
5019 * Note that we don't turn on O_EXCL unless the stat failed -- if the
5020 * file was not a regular file, we leave O_EXCL off.
5023 return open(fname, O_WRONLY|O_CREAT|O_EXCL, 0666);
5024 fd = open(fname, O_WRONLY|O_CREAT, 0666);
5026 /* If the open failed, return the file descriptor right away. */
5031 * OK, the open succeeded, but the file may have been changed from a
5032 * non-regular file to a regular file between the stat and the open.
5033 * We are assuming that the O_EXCL open handles the case where FILENAME
5034 * did not exist and is symlinked to an existing file between the stat
5039 * If we can open it and fstat the file descriptor, and neither check
5040 * revealed that it was a regular file, and the file has not been
5041 * replaced, return the file descriptor.
5043 if (fstat(fd, &finfo2) == 0
5044 && !S_ISREG(finfo2.st_mode)
5045 && finfo.st_dev == finfo2.st_dev
5046 && finfo.st_ino == finfo2.st_ino
5051 /* The file has been replaced. badness. */
5058 * Handle here documents. Normally we fork off a process to write the
5059 * data to a pipe. If the document is short, we can stuff the data in
5060 * the pipe without forking.
5062 /* openhere needs this forward reference */
5063 static void expandhere(union node *arg, int fd);
5065 openhere(union node *redir)
5071 ash_msg_and_raise_error("pipe call failed");
5072 if (redir->type == NHERE) {
5073 len = strlen(redir->nhere.doc->narg.text);
5074 if (len <= PIPE_BUF) {
5075 full_write(pip[1], redir->nhere.doc->narg.text, len);
5079 if (forkshell((struct job *)NULL, (union node *)NULL, FORK_NOJOB) == 0) {
5082 ignoresig(SIGINT); //signal(SIGINT, SIG_IGN);
5083 ignoresig(SIGQUIT); //signal(SIGQUIT, SIG_IGN);
5084 ignoresig(SIGHUP); //signal(SIGHUP, SIG_IGN);
5085 ignoresig(SIGTSTP); //signal(SIGTSTP, SIG_IGN);
5086 signal(SIGPIPE, SIG_DFL);
5087 if (redir->type == NHERE)
5088 full_write(pip[1], redir->nhere.doc->narg.text, len);
5090 expandhere(redir->nhere.doc, pip[1]);
5091 _exit(EXIT_SUCCESS);
5099 openredirect(union node *redir)
5104 fname = redir->nfile.expfname;
5105 switch (redir->nfile.type) {
5107 f = open(fname, O_RDONLY);
5112 f = open(fname, O_RDWR|O_CREAT, 0666);
5117 #if ENABLE_ASH_BASH_COMPAT
5120 /* Take care of noclobber mode. */
5122 f = noclobberopen(fname);
5129 f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666);
5134 f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666);
5142 /* Fall through to eliminate warning. */
5143 /* Our single caller does this itself */
5150 f = openhere(redir);
5156 ash_msg_and_raise_error("can't create %s: %s", fname, errmsg(errno, "nonexistent directory"));
5158 ash_msg_and_raise_error("can't open %s: %s", fname, errmsg(errno, "no such file"));
5162 * Copy a file descriptor to be >= to. Returns -1
5163 * if the source file descriptor is closed, EMPTY if there are no unused
5164 * file descriptors left.
5166 /* 0x800..00: bit to set in "to" to request dup2 instead of fcntl(F_DUPFD).
5167 * old code was doing close(to) prior to copyfd() to achieve the same */
5169 COPYFD_EXACT = (int)~(INT_MAX),
5170 COPYFD_RESTORE = (int)((unsigned)COPYFD_EXACT >> 1),
5173 copyfd(int from, int to)
5177 if (to & COPYFD_EXACT) {
5178 to &= ~COPYFD_EXACT;
5180 newfd = dup2(from, to);
5182 newfd = fcntl(from, F_DUPFD, to);
5185 if (errno == EMFILE)
5187 /* Happens when source fd is not open: try "echo >&99" */
5188 ash_msg_and_raise_error("%d: %m", from);
5193 /* Struct def and variable are moved down to the first usage site */
5198 struct redirtab *next;
5201 struct two_fd_t two_fd[];
5203 #define redirlist (G_var.redirlist)
5205 static int need_to_remember(struct redirtab *rp, int fd)
5209 if (!rp) /* remembering was not requested */
5212 for (i = 0; i < rp->pair_count; i++) {
5213 if (rp->two_fd[i].orig == fd) {
5214 /* already remembered */
5221 /* "hidden" fd is a fd used to read scripts, or a copy of such */
5222 static int is_hidden_fd(struct redirtab *rp, int fd)
5225 struct parsefile *pf;
5229 /* Check open scripts' fds */
5232 /* We skip pf_fd == 0 case because of the following case:
5233 * $ ash # running ash interactively
5235 * and in script.sh: "exec 9>&0".
5236 * Even though top-level pf_fd _is_ 0,
5237 * it's still ok to use it: "read" builtin uses it,
5238 * why should we cripple "exec" builtin?
5240 if (pf->pf_fd > 0 && fd == pf->pf_fd) {
5248 /* Check saved fds of redirects */
5249 fd |= COPYFD_RESTORE;
5250 for (i = 0; i < rp->pair_count; i++) {
5251 if (rp->two_fd[i].copy == fd) {
5259 * Process a list of redirection commands. If the REDIR_PUSH flag is set,
5260 * old file descriptors are stashed away so that the redirection can be
5261 * undone by calling popredir.
5263 /* flags passed to redirect */
5264 #define REDIR_PUSH 01 /* save previous values of file descriptors */
5265 #define REDIR_SAVEFD2 03 /* set preverrout */
5267 redirect(union node *redir, int flags)
5269 struct redirtab *sv;
5274 int copied_fd2 = -1;
5284 if (flags & REDIR_PUSH) {
5285 union node *tmp = redir;
5288 #if ENABLE_ASH_BASH_COMPAT
5289 if (tmp->nfile.type == NTO2)
5292 tmp = tmp->nfile.next;
5294 sv = ckmalloc(sizeof(*sv) + sv_pos * sizeof(sv->two_fd[0]));
5295 sv->next = redirlist;
5296 sv->pair_count = sv_pos;
5298 sv->nullredirs = g_nullredirs - 1;
5300 while (sv_pos > 0) {
5302 sv->two_fd[sv_pos].orig = sv->two_fd[sv_pos].copy = EMPTY;
5308 fd = redir->nfile.fd;
5309 if (redir->nfile.type == NTOFD || redir->nfile.type == NFROMFD) {
5310 right_fd = redir->ndup.dupfd;
5311 //bb_error_msg("doing %d > %d", fd, right_fd);
5312 /* redirect from/to same file descriptor? */
5315 /* "echo >&10" and 10 is a fd opened to a sh script? */
5316 if (is_hidden_fd(sv, right_fd)) {
5317 errno = EBADF; /* as if it is closed */
5318 ash_msg_and_raise_error("%d: %m", right_fd);
5322 newfd = openredirect(redir); /* always >= 0 */
5324 /* Descriptor wasn't open before redirect.
5325 * Mark it for close in the future */
5326 if (need_to_remember(sv, fd)) {
5327 goto remember_to_close;
5332 #if ENABLE_ASH_BASH_COMPAT
5335 if (need_to_remember(sv, fd)) {
5336 /* Copy old descriptor */
5337 /* Careful to not accidentally "save"
5338 * to the same fd as right side fd in N>&M */
5339 int minfd = right_fd < 10 ? 10 : right_fd + 1;
5340 i = fcntl(fd, F_DUPFD, minfd);
5341 /* You'd expect copy to be CLOEXECed. Currently these extra "saved" fds
5342 * are closed in popredir() in the child, preventing them from leaking
5343 * into child. (popredir() also cleans up the mess in case of failures)
5348 /* Strange error (e.g. "too many files" EMFILE?) */
5352 ash_msg_and_raise_error("%d: %m", fd);
5355 /* EBADF: it is not open - good, remember to close it */
5358 } else { /* fd is open, save its copy */
5359 /* "exec fd>&-" should not close fds
5360 * which point to script file(s).
5361 * Force them to be restored afterwards */
5362 if (is_hidden_fd(sv, fd))
5363 i |= COPYFD_RESTORE;
5367 sv->two_fd[sv_pos].orig = fd;
5368 sv->two_fd[sv_pos].copy = i;
5372 /* NTOFD/NFROMFD: copy redir->ndup.dupfd to fd */
5373 if (redir->ndup.dupfd < 0) { /* "fd>&-" */
5374 /* Don't want to trigger debugging */
5378 copyfd(redir->ndup.dupfd, fd | COPYFD_EXACT);
5380 } else if (fd != newfd) { /* move newfd to fd */
5381 copyfd(newfd, fd | COPYFD_EXACT);
5382 #if ENABLE_ASH_BASH_COMPAT
5383 if (!(redir->nfile.type == NTO2 && fd == 2))
5387 #if ENABLE_ASH_BASH_COMPAT
5388 if (redir->nfile.type == NTO2 && fd == 1) {
5389 /* We already redirected it to fd 1, now copy it to 2 */
5395 } while ((redir = redir->nfile.next) != NULL);
5398 if ((flags & REDIR_SAVEFD2) && copied_fd2 >= 0)
5399 preverrout_fd = copied_fd2;
5403 * Undo the effects of the last redirection.
5406 popredir(int drop, int restore)
5408 struct redirtab *rp;
5411 if (--g_nullredirs >= 0 || redirlist == NULL)
5415 for (i = 0; i < rp->pair_count; i++) {
5416 int fd = rp->two_fd[i].orig;
5417 int copy = rp->two_fd[i].copy;
5418 if (copy == CLOSED) {
5423 if (copy != EMPTY) {
5424 if (!drop || (restore && (copy & COPYFD_RESTORE))) {
5425 copy &= ~COPYFD_RESTORE;
5427 copyfd(copy, fd | COPYFD_EXACT);
5429 close(copy & ~COPYFD_RESTORE);
5432 redirlist = rp->next;
5433 g_nullredirs = rp->nullredirs;
5439 * Undo all redirections. Called on error or interrupt.
5443 * Discard all saved file descriptors.
5446 clearredir(int drop)
5452 popredir(drop, /*restore:*/ 0);
5457 redirectsafe(union node *redir, int flags)
5460 volatile int saveint;
5461 struct jmploc *volatile savehandler = exception_handler;
5462 struct jmploc jmploc;
5465 /* "echo 9>/dev/null; echo >&9; echo result: $?" - result should be 1, not 2! */
5466 err = setjmp(jmploc.loc); // huh?? was = setjmp(jmploc.loc) * 2;
5468 exception_handler = &jmploc;
5469 redirect(redir, flags);
5471 exception_handler = savehandler;
5472 if (err && exception_type != EXERROR)
5473 longjmp(exception_handler->loc, 1);
5474 RESTORE_INT(saveint);
5479 /* ============ Routines to expand arguments to commands
5481 * We have to deal with backquotes, shell variables, and file metacharacters.
5484 #if ENABLE_SH_MATH_SUPPORT
5486 ash_arith(const char *s)
5488 arith_state_t math_state;
5491 math_state.lookupvar = lookupvar;
5492 math_state.setvar = setvar0;
5493 //math_state.endofname = endofname;
5496 result = arith(&math_state, s);
5497 if (math_state.errmsg)
5498 ash_msg_and_raise_error(math_state.errmsg);
5508 #define EXP_FULL 0x1 /* perform word splitting & file globbing */
5509 #define EXP_TILDE 0x2 /* do normal tilde expansion */
5510 #define EXP_VARTILDE 0x4 /* expand tildes in an assignment */
5511 #define EXP_REDIR 0x8 /* file glob for a redirection (1 match only) */
5512 #define EXP_CASE 0x10 /* keeps quotes around for CASE pattern */
5513 #define EXP_QPAT 0x20 /* pattern in quoted parameter expansion */
5514 #define EXP_VARTILDE2 0x40 /* expand tildes after colons only */
5515 #define EXP_WORD 0x80 /* expand word in parameter expansion */
5516 #define EXP_QUOTED 0x100 /* expand word in double quotes */
5520 #define RMESCAPE_ALLOC 0x1 /* Allocate a new string */
5521 #define RMESCAPE_GLOB 0x2 /* Add backslashes for glob */
5522 #define RMESCAPE_GROW 0x8 /* Grow strings instead of stalloc */
5523 #define RMESCAPE_HEAP 0x10 /* Malloc strings instead of stalloc */
5524 #define RMESCAPE_SLASH 0x20 /* Stop globbing after slash */
5526 /* Add CTLESC when necessary. */
5527 #define QUOTES_ESC (EXP_FULL | EXP_CASE | EXP_QPAT | EXP_REDIR)
5528 /* Do not skip NUL characters. */
5529 #define QUOTES_KEEPNUL EXP_TILDE
5532 * Structure specifying which parts of the string should be searched
5533 * for IFS characters.
5536 struct ifsregion *next; /* next region in list */
5537 int begoff; /* offset of start of region */
5538 int endoff; /* offset of end of region */
5539 int nulonly; /* search for nul bytes only */
5543 struct strlist *list;
5544 struct strlist **lastp;
5547 /* output of current string */
5548 static char *expdest;
5549 /* list of back quote expressions */
5550 static struct nodelist *argbackq;
5551 /* first struct in list of ifs regions */
5552 static struct ifsregion ifsfirst;
5553 /* last struct in list */
5554 static struct ifsregion *ifslastp;
5555 /* holds expanded arg list */
5556 static struct arglist exparg;
5561 #if !ENABLE_SH_MATH_SUPPORT
5562 /* cvtnum() is used even if math support is off (to prepare $? values and such) */
5563 typedef long arith_t;
5564 # define ARITH_FMT "%ld"
5571 expdest = makestrspace(sizeof(arith_t)*3 + 2, expdest);
5572 len = fmtstr(expdest, sizeof(arith_t)*3 + 2, ARITH_FMT, num);
5573 STADJUST(len, expdest);
5578 esclen(const char *start, const char *p)
5582 while (p > start && (unsigned char)*--p == CTLESC) {
5589 * Remove any CTLESC characters from a string.
5592 rmescapes(char *str, int flag)
5594 static const char qchars[] ALIGN1 = {
5595 IF_ASH_BASH_COMPAT('/',) CTLESC, CTLQUOTEMARK, '\0' };
5599 unsigned protect_against_glob;
5601 IF_ASH_BASH_COMPAT(unsigned slash = flag & RMESCAPE_SLASH;)
5603 p = strpbrk(str, qchars IF_ASH_BASH_COMPAT(+ !slash));
5609 if (flag & RMESCAPE_ALLOC) {
5610 size_t len = p - str;
5611 size_t fulllen = len + strlen(p) + 1;
5613 if (flag & RMESCAPE_GROW) {
5614 int strloc = str - (char *)stackblock();
5615 r = makestrspace(fulllen, expdest);
5616 /* p and str may be invalidated by makestrspace */
5617 str = (char *)stackblock() + strloc;
5619 } else if (flag & RMESCAPE_HEAP) {
5620 r = ckmalloc(fulllen);
5622 r = stalloc(fulllen);
5626 q = (char *)memcpy(q, str, len) + len;
5631 globbing = flag & RMESCAPE_GLOB;
5632 protect_against_glob = globbing;
5634 if ((unsigned char)*p == CTLQUOTEMARK) {
5635 // Note: both inquotes and protect_against_glob only affect whether
5636 // CTLESC,<ch> gets converted to <ch> or to \<ch>
5637 inquotes = ~inquotes;
5639 protect_against_glob = globbing;
5642 if ((unsigned char)*p == CTLESC) {
5644 if (protect_against_glob) {
5647 } else if (*p == '\\' && !inquotes) {
5648 /* naked back slash */
5649 protect_against_glob = 0;
5652 #if ENABLE_ASH_BASH_COMPAT
5653 else if (*p == '/' && slash) {
5654 /* stop handling globbing and mark location of slash */
5655 globbing = slash = 0;
5659 protect_against_glob = globbing;
5664 if (flag & RMESCAPE_GROW) {
5666 STADJUST(q - r + 1, expdest);
5670 #define pmatch(a, b) !fnmatch((a), (b), 0)
5673 * Prepare a pattern for a expmeta (internal glob(3)) call.
5675 * Returns an stalloced string.
5678 preglob(const char *pattern, int flag)
5680 return rmescapes((char *)pattern, flag | RMESCAPE_GLOB);
5684 * Put a string on the stack.
5687 memtodest(const char *p, size_t len, int syntax, int quotes)
5694 q = makestrspace((quotes & QUOTES_ESC) ? len * 2 : len, expdest);
5697 unsigned char c = *p++;
5699 int n = SIT(c, syntax);
5700 if ((quotes & QUOTES_ESC) &&
5702 (((quotes & EXP_FULL) || syntax != BASESYNTAX) &&
5705 } else if (!(quotes & QUOTES_KEEPNUL))
5714 strtodest(const char *p, int syntax, int quotes)
5716 size_t len = strlen(p);
5717 memtodest(p, len, syntax, quotes);
5722 * Record the fact that we have to scan this region of the
5723 * string for IFS characters.
5726 recordregion(int start, int end, int nulonly)
5728 struct ifsregion *ifsp;
5730 if (ifslastp == NULL) {
5734 ifsp = ckzalloc(sizeof(*ifsp));
5735 /*ifsp->next = NULL; - ckzalloc did it */
5736 ifslastp->next = ifsp;
5740 ifslastp->begoff = start;
5741 ifslastp->endoff = end;
5742 ifslastp->nulonly = nulonly;
5746 removerecordregions(int endoff)
5748 if (ifslastp == NULL)
5751 if (ifsfirst.endoff > endoff) {
5752 while (ifsfirst.next) {
5753 struct ifsregion *ifsp;
5755 ifsp = ifsfirst.next->next;
5756 free(ifsfirst.next);
5757 ifsfirst.next = ifsp;
5760 if (ifsfirst.begoff > endoff) {
5763 ifslastp = &ifsfirst;
5764 ifsfirst.endoff = endoff;
5769 ifslastp = &ifsfirst;
5770 while (ifslastp->next && ifslastp->next->begoff < endoff)
5771 ifslastp = ifslastp->next;
5772 while (ifslastp->next) {
5773 struct ifsregion *ifsp;
5775 ifsp = ifslastp->next->next;
5776 free(ifslastp->next);
5777 ifslastp->next = ifsp;
5780 if (ifslastp->endoff > endoff)
5781 ifslastp->endoff = endoff;
5785 exptilde(char *startp, char *p, int flags)
5791 int quotes = flags & QUOTES_ESC;
5795 while ((c = *++p) != '\0') {
5802 if (flags & EXP_VARTILDE)
5812 if (*name == '\0') {
5813 home = lookupvar("HOME");
5815 pw = getpwnam(name);
5820 if (!home || !*home)
5823 strtodest(home, SQSYNTAX, quotes);
5831 * Execute a command inside back quotes. If it's a builtin command, we
5832 * want to save its output in a block obtained from malloc. Otherwise
5833 * we fork off a subprocess and get the output of the command via a pipe.
5834 * Should be called with interrupts off.
5836 struct backcmd { /* result of evalbackcmd */
5837 int fd; /* file descriptor to read from */
5838 int nleft; /* number of chars in buffer */
5839 char *buf; /* buffer */
5840 struct job *jp; /* job structure for command */
5843 /* These forward decls are needed to use "eval" code for backticks handling: */
5844 static uint8_t back_exitstatus; /* exit status of backquoted command */
5845 #define EV_EXIT 01 /* exit after evaluating tree */
5846 static void evaltree(union node *, int);
5848 static void FAST_FUNC
5849 evalbackcmd(union node *n, struct backcmd *result)
5860 saveherefd = herefd;
5868 ash_msg_and_raise_error("pipe call failed");
5869 jp = makejob(/*n,*/ 1);
5870 if (forkshell(jp, n, FORK_NOJOB) == 0) {
5875 copyfd(pip[1], 1 | COPYFD_EXACT);
5879 evaltree(n, EV_EXIT); /* actually evaltreenr... */
5883 result->fd = pip[0];
5886 herefd = saveherefd;
5888 TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n",
5889 result->fd, result->buf, result->nleft, result->jp));
5893 * Expand stuff in backwards quotes.
5896 expbackq(union node *cmd, int flag)
5904 int syntax = flag & EXP_QUOTED ? DQSYNTAX : BASESYNTAX;
5905 struct stackmark smark;
5908 setstackmark(&smark);
5910 startloc = dest - (char *)stackblock();
5912 evalbackcmd(cmd, &in);
5913 popstackmark(&smark);
5920 memtodest(p, i, syntax, flag & QUOTES_ESC);
5924 i = nonblock_immune_read(in.fd, buf, sizeof(buf));
5925 TRACE(("expbackq: read returns %d\n", i));
5934 back_exitstatus = waitforjob(in.jp);
5938 /* Eat all trailing newlines */
5940 for (; dest > (char *)stackblock() && dest[-1] == '\n';)
5944 if (!(flag & EXP_QUOTED))
5945 recordregion(startloc, dest - (char *)stackblock(), 0);
5946 TRACE(("evalbackq: size:%d:'%.*s'\n",
5947 (int)((dest - (char *)stackblock()) - startloc),
5948 (int)((dest - (char *)stackblock()) - startloc),
5949 stackblock() + startloc));
5952 #if ENABLE_SH_MATH_SUPPORT
5954 * Expand arithmetic expression. Backup to start of expression,
5955 * evaluate, place result in (backed up) result, adjust string position.
5967 * This routine is slightly over-complicated for
5968 * efficiency. Next we scan backwards looking for the
5969 * start of arithmetic.
5971 start = stackblock();
5978 while ((unsigned char)*p != CTLARI) {
5982 ash_msg_and_raise_error("missing CTLARI (shouldn't happen)");
5987 esc = esclen(start, p);
5997 removerecordregions(begoff);
6001 if (flag & QUOTES_ESC)
6002 rmescapes(p + 1, 0);
6004 len = cvtnum(ash_arith(p + 1));
6006 if (!(flag & EXP_QUOTED))
6007 recordregion(begoff, begoff + len, 0);
6011 /* argstr needs it */
6012 static char *evalvar(char *p, int flags, struct strlist *var_str_list);
6015 * Perform variable and command substitution. If EXP_FULL is set, output CTLESC
6016 * characters to allow for further processing. Otherwise treat
6017 * $@ like $* since no splitting will be performed.
6019 * var_str_list (can be NULL) is a list of "VAR=val" strings which take precedence
6020 * over shell varables. Needed for "A=a B=$A; echo $B" case - we use it
6021 * for correct expansion of "B=$A" word.
6024 argstr(char *p, int flags, struct strlist *var_str_list)
6026 static const char spclchars[] ALIGN1 = {
6034 #if ENABLE_SH_MATH_SUPPORT
6039 const char *reject = spclchars;
6040 int breakall = (flags & (EXP_WORD | EXP_QUOTED)) == EXP_WORD;
6045 if (!(flags & EXP_VARTILDE)) {
6047 } else if (flags & EXP_VARTILDE2) {
6052 if (flags & EXP_TILDE) {
6055 flags &= ~EXP_TILDE;
6059 p = exptilde(p, q, flags);
6062 startloc = expdest - (char *)stackblock();
6066 length += strcspn(p + length, reject);
6070 IF_SH_MATH_SUPPORT(|| c == CTLENDARI)
6072 /* c == '=' || c == ':' || c == CTLENDARI */
6078 expdest = stack_nputstr(p, length, expdest);
6079 newloc = expdest - (char *)stackblock();
6080 if (breakall && !inquotes && newloc > startloc) {
6081 recordregion(startloc, newloc, 0);
6092 if (flags & EXP_VARTILDE2) {
6096 flags |= EXP_VARTILDE2;
6101 * sort of a hack - expand tildes in variable
6102 * assignments (after the first '=' and after ':'s).
6111 case CTLENDVAR: /* ??? */
6114 inquotes ^= EXP_QUOTED;
6115 /* "$@" syntax adherence hack */
6116 if (inquotes && !memcmp(p, dolatstr + 1, DOLATSTRLEN - 1)) {
6117 p = evalvar(p + 1, flags | inquotes, /* var_str_list: */ NULL) + 1;
6121 if (flags & QUOTES_ESC) {
6132 * Quoted parameter expansion pattern: remove quote
6133 * unless inside inner quotes or we have a literal
6136 if (((flags | inquotes) & (EXP_QPAT | EXP_QUOTED)) ==
6137 EXP_QPAT && *p != '\\')
6142 TRACE(("argstr: evalvar('%s')\n", p));
6143 p = evalvar(p, flags | inquotes, var_str_list);
6144 TRACE(("argstr: evalvar:'%s'\n", (char *)stackblock()));
6147 expbackq(argbackq->n, flags | inquotes);
6148 argbackq = argbackq->next;
6150 #if ENABLE_SH_MATH_SUPPORT
6153 expari(flags | inquotes);
6162 scanleft(char *startp, char *rmesc, char *rmescend UNUSED_PARAM,
6163 char *pattern, int quotes, int zero)
6172 const char *s = loc2;
6179 match = pmatch(pattern, s);
6184 if (quotes && (unsigned char)*loc == CTLESC)
6193 scanright(char *startp, char *rmesc, char *rmescend,
6194 char *pattern, int quotes, int match_at_start)
6196 #if !ENABLE_ASH_OPTIMIZE_FOR_SIZE
6197 int try2optimize = match_at_start;
6203 /* If we called by "${v/pattern/repl}" or "${v//pattern/repl}":
6204 * startp="escaped_value_of_v" rmesc="raw_value_of_v"
6205 * rmescend=""(ptr to NUL in rmesc) pattern="pattern" quotes=match_at_start=1
6207 * loc starts at NUL at the end of startp, loc2 starts at the end of rmesc,
6208 * and on each iteration they go back two/one char until they reach the beginning.
6209 * We try to find a match in "raw_value_of_v", "raw_value_of_", "raw_value_of" etc.
6211 /* TODO: document in what other circumstances we are called. */
6213 for (loc = pattern - 1, loc2 = rmescend; loc >= startp; loc2--) {
6216 const char *s = loc2;
6217 if (match_at_start) {
6221 match = pmatch(pattern, s);
6222 //bb_error_msg("pmatch(pattern:'%s',s:'%s'):%d", pattern, s, match);
6226 #if !ENABLE_ASH_OPTIMIZE_FOR_SIZE
6228 /* Maybe we can optimize this:
6229 * if pattern ends with unescaped *, we can avoid checking
6230 * shorter strings: if "foo*" doesnt match "raw_value_of_v",
6231 * it wont match truncated "raw_value_of_" strings too.
6233 unsigned plen = strlen(pattern);
6234 /* Does it end with "*"? */
6235 if (plen != 0 && pattern[--plen] == '*') {
6236 /* "xxxx*" is not escaped */
6237 /* "xxx\*" is escaped */
6238 /* "xx\\*" is not escaped */
6239 /* "x\\\*" is escaped */
6241 while (plen != 0 && pattern[--plen] == '\\')
6244 break; /* ends with unescaped "*" */
6252 esc = esclen(startp, loc);
6263 static void varunset(const char *, const char *, const char *, int) NORETURN;
6265 varunset(const char *end, const char *var, const char *umsg, int varflags)
6271 msg = "parameter not set";
6273 if ((unsigned char)*end == CTLENDVAR) {
6274 if (varflags & VSNUL)
6280 ash_msg_and_raise_error("%.*s: %s%s", (int)(end - var - 1), var, msg, tail);
6284 subevalvar(char *p, char *varname, int strloc, int subtype,
6285 int startloc, int varflags, int flag, struct strlist *var_str_list)
6287 struct nodelist *saveargbackq = argbackq;
6288 int quotes = flag & QUOTES_ESC;
6291 char *rmesc, *rmescend;
6293 IF_ASH_BASH_COMPAT(char *repl = NULL;)
6294 IF_ASH_BASH_COMPAT(int pos, len, orig_len;)
6295 int saveherefd = herefd;
6296 int amount, resetloc;
6297 IF_ASH_BASH_COMPAT(int workloc;)
6299 char *(*scan)(char*, char*, char*, char*, int, int);
6301 //bb_error_msg("subevalvar(p:'%s',varname:'%s',strloc:%d,subtype:%d,startloc:%d,varflags:%x,quotes:%d)",
6302 // p, varname, strloc, subtype, startloc, varflags, quotes);
6305 argstr(p, EXP_TILDE | (subtype != VSASSIGN && subtype != VSQUESTION ?
6306 (flag & (EXP_QUOTED | EXP_QPAT) ? EXP_QPAT : EXP_CASE) : 0),
6308 STPUTC('\0', expdest);
6309 herefd = saveherefd;
6310 argbackq = saveargbackq;
6311 startp = (char *)stackblock() + startloc;
6315 setvar0(varname, startp);
6316 amount = startp - expdest;
6317 STADJUST(amount, expdest);
6321 varunset(p, varname, startp, varflags);
6324 #if ENABLE_ASH_BASH_COMPAT
6326 //TODO: support more general format ${v:EXPR:EXPR},
6327 // where EXPR follows $(()) rules
6328 loc = str = stackblock() + strloc;
6329 /* Read POS in ${var:POS:LEN} */
6330 pos = atoi(loc); /* number(loc) errors out on "1:4" */
6331 len = str - startp - 1;
6333 /* *loc != '\0', guaranteed by parser */
6337 /* Adjust the length by the number of escapes */
6338 for (ptr = startp; ptr < (str - 1); ptr++) {
6339 if ((unsigned char)*ptr == CTLESC) {
6347 if (*loc++ == ':') {
6351 /* Skip POS in ${var:POS:LEN} */
6353 while (*loc && *loc != ':') {
6355 * bash complains on: var=qwe; echo ${var:1a:123}
6357 ash_msg_and_raise_error(msg_illnum, str);
6361 if (*loc++ == ':') {
6366 /* ${VAR:$((-n)):l} starts n chars from the end */
6367 pos = orig_len + pos;
6369 if ((unsigned)pos >= orig_len) {
6370 /* apart from obvious ${VAR:999999:l},
6371 * covers ${VAR:$((-9999999)):l} - result is ""
6377 if (len > (orig_len - pos))
6378 len = orig_len - pos;
6380 for (str = startp; pos; str++, pos--) {
6381 if (quotes && (unsigned char)*str == CTLESC)
6384 for (loc = startp; len; len--) {
6385 if (quotes && (unsigned char)*str == CTLESC)
6390 amount = loc - expdest;
6391 STADJUST(amount, expdest);
6396 resetloc = expdest - (char *)stackblock();
6398 /* We'll comeback here if we grow the stack while handling
6399 * a VSREPLACE or VSREPLACEALL, since our pointers into the
6400 * stack will need rebasing, and we'll need to remove our work
6403 IF_ASH_BASH_COMPAT(restart:)
6405 amount = expdest - ((char *)stackblock() + resetloc);
6406 STADJUST(-amount, expdest);
6407 startp = (char *)stackblock() + startloc;
6410 rmescend = (char *)stackblock() + strloc;
6412 rmesc = rmescapes(startp, RMESCAPE_ALLOC | RMESCAPE_GROW);
6413 if (rmesc != startp) {
6415 startp = (char *)stackblock() + startloc;
6419 str = (char *)stackblock() + strloc;
6421 * Example: v='a\bc'; echo ${v/\\b/_\\_\z_}
6422 * The result is a_\_z_c (not a\_\_z_c)!
6424 * The search pattern and replace string treat backslashes differently!
6425 * RMESCAPE_SLASH causes preglob to work differently on the pattern
6426 * and string. It's only used on the first call.
6428 preglob(str, IF_ASH_BASH_COMPAT(
6429 (subtype == VSREPLACE || subtype == VSREPLACEALL) && !repl ?
6430 RMESCAPE_SLASH :) 0);
6432 #if ENABLE_ASH_BASH_COMPAT
6433 workloc = expdest - (char *)stackblock();
6434 if (subtype == VSREPLACE || subtype == VSREPLACEALL) {
6438 if ((repl=strchr(str, CTLESC)))
6443 //bb_error_msg("str:'%s' repl:'%s'", str, repl);
6445 /* If there's no pattern to match, return the expansion unmolested */
6454 loc = scanright(idx, rmesc, rmescend, str, quotes, 1);
6455 //bb_error_msg("scanright('%s'):'%s'", str, loc);
6457 /* No match, advance */
6458 char *restart_detect = stackblock();
6460 STPUTC(*idx, expdest);
6461 if (quotes && (unsigned char)*idx == CTLESC) {
6464 STPUTC(*idx, expdest);
6466 if (stackblock() != restart_detect)
6471 /* continue; - prone to quadratic behavior, smarter code: */
6474 if (str[0] == '*') {
6475 /* Pattern is "*foo". If "*foo" does not match "long_string",
6476 * it would never match "ong_string" etc, no point in trying.
6483 if (subtype == VSREPLACEALL) {
6485 if (quotes && (unsigned char)*idx == CTLESC)
6494 //bb_error_msg("repl:'%s'", repl);
6495 for (loc = (char*)repl; *loc; loc++) {
6496 char *restart_detect = stackblock();
6497 if (quotes && *loc == '\\') {
6498 STPUTC(CTLESC, expdest);
6501 STPUTC(*loc, expdest);
6502 if (stackblock() != restart_detect)
6507 if (subtype == VSREPLACE) {
6508 //bb_error_msg("tail:'%s', quotes:%x", idx, quotes);
6510 char *restart_detect = stackblock();
6511 STPUTC(*idx, expdest);
6512 if (stackblock() != restart_detect)
6521 /* We've put the replaced text into a buffer at workloc, now
6522 * move it to the right place and adjust the stack.
6524 STPUTC('\0', expdest);
6525 startp = (char *)stackblock() + startloc;
6526 memmove(startp, (char *)stackblock() + workloc, len + 1);
6527 //bb_error_msg("startp:'%s'", startp);
6528 amount = expdest - (startp + len);
6529 STADJUST(-amount, expdest);
6532 #endif /* ENABLE_ASH_BASH_COMPAT */
6534 subtype -= VSTRIMRIGHT;
6536 if (subtype < 0 || subtype > 7)
6539 /* zero = (subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX) */
6540 zero = subtype >> 1;
6541 /* VSTRIMLEFT/VSTRIMRIGHTMAX -> scanleft */
6542 scan = (subtype & 1) ^ zero ? scanleft : scanright;
6544 loc = scan(startp, rmesc, rmescend, str, quotes, zero);
6547 memmove(startp, loc, str - loc);
6548 loc = startp + (str - loc) - 1;
6551 amount = loc - expdest;
6552 STADJUST(amount, expdest);
6558 * Add the value of a specialized variable to the stack string.
6559 * name parameter (examples):
6560 * ash -c 'echo $1' name:'1='
6561 * ash -c 'echo $qwe' name:'qwe='
6562 * ash -c 'echo $$' name:'$='
6563 * ash -c 'echo ${$}' name:'$='
6564 * ash -c 'echo ${$##q}' name:'$=q'
6565 * ash -c 'echo ${#$}' name:'$='
6566 * note: examples with bad shell syntax:
6567 * ash -c 'echo ${#$1}' name:'$=1'
6568 * ash -c 'echo ${#1#}' name:'1=#'
6570 static NOINLINE ssize_t
6571 varvalue(char *name, int varflags, int flags, struct strlist *var_str_list)
6578 int quoted = flags & EXP_QUOTED;
6579 int subtype = varflags & VSTYPE;
6580 int discard = subtype == VSPLUS || subtype == VSLENGTH;
6581 int quotes = (discard ? 0 : (flags & QUOTES_ESC)) | QUOTES_KEEPNUL;
6582 int syntax = quoted ? DQSYNTAX : BASESYNTAX;
6584 sep = quoted ? ((flags & EXP_FULL) << CHAR_BIT) : 0;
6594 num = shellparam.nparam;
6602 goto check_1char_name;
6604 expdest = makestrspace(NOPTS, expdest);
6605 for (i = NOPTS - 1; i >= 0; i--) {
6607 USTPUTC(optletters(i), expdest);
6613 /* handles cases similar to ${#$1} */
6614 if (name[2] != '\0')
6615 raise_error_syntax("bad substitution");
6622 if (quoted && (flags & EXP_FULL)) {
6623 /* note: this is not meant as PEOF value */
6624 sep = 1 << CHAR_BIT;
6629 sep = ifsset() ? (unsigned char)(ifsval()[0]) : ' ';
6635 while ((p = *ap++) != NULL) {
6636 len += strtodest(p, syntax, quotes);
6640 memtodest(&sepc, 1, syntax, quotes);
6644 } /* case '@' and '*' */
6655 num = atoi(name); /* number(name) fails on ${N#str} etc */
6656 if (num < 0 || num > shellparam.nparam)
6658 p = num ? shellparam.p[num - 1] : arg0;
6661 /* NB: name has form "VAR=..." */
6663 /* "A=a B=$A" case: var_str_list is a list of "A=a" strings
6664 * which should be considered before we check variables. */
6666 unsigned name_len = (strchrnul(name, '=') - name) + 1;
6670 str = var_str_list->text;
6671 eq = strchr(str, '=');
6672 if (!eq) /* stop at first non-assignment */
6675 if (name_len == (unsigned)(eq - str)
6676 && strncmp(str, name, name_len) == 0
6679 /* goto value; - WRONG! */
6680 /* think "A=1 A=2 B=$A" */
6682 var_str_list = var_str_list->next;
6683 } while (var_str_list);
6687 p = lookupvar(name);
6692 len = strtodest(p, syntax, quotes);
6693 #if ENABLE_UNICODE_SUPPORT
6694 if (subtype == VSLENGTH && len > 0) {
6695 reinit_unicode_for_ash();
6696 if (unicode_status == UNICODE_ON) {
6697 STADJUST(-len, expdest);
6699 len = unicode_strlen(p);
6707 STADJUST(-len, expdest);
6712 * Expand a variable, and return a pointer to the next character in the
6716 evalvar(char *p, int flags, struct strlist *var_str_list)
6727 varflags = (unsigned char) *p++;
6728 subtype = varflags & VSTYPE;
6729 quoted = flags & EXP_QUOTED;
6731 easy = (!quoted || (*var == '@' && shellparam.nparam));
6732 startloc = expdest - (char *)stackblock();
6733 p = strchr(p, '=') + 1; //TODO: use var_end(p)?
6736 varlen = varvalue(var, varflags, flags, var_str_list);
6737 if (varflags & VSNUL)
6740 if (subtype == VSPLUS) {
6741 varlen = -1 - varlen;
6745 if (subtype == VSMINUS) {
6750 flags | EXP_TILDE | EXP_WORD,
6760 if (subtype == VSASSIGN || subtype == VSQUESTION) {
6762 if (subevalvar(p, var, /* strloc: */ 0,
6763 subtype, startloc, varflags,
6764 /* quotes: */ flags & ~QUOTES_ESC,
6769 * Remove any recorded regions beyond
6772 removerecordregions(startloc);
6782 if (varlen < 0 && uflag)
6783 varunset(p, var, 0, 0);
6785 if (subtype == VSLENGTH) {
6786 cvtnum(varlen > 0 ? varlen : 0);
6790 if (subtype == VSNORMAL) {
6801 case VSTRIMRIGHTMAX:
6802 #if ENABLE_ASH_BASH_COMPAT
6815 * Terminate the string and start recording the pattern
6818 STPUTC('\0', expdest);
6819 patloc = expdest - (char *)stackblock();
6820 if (NULL == subevalvar(p, /* varname: */ NULL, patloc, subtype,
6821 startloc, varflags, flags, var_str_list)) {
6822 int amount = expdest - (
6823 (char *)stackblock() + patloc - 1
6825 STADJUST(-amount, expdest);
6827 /* Remove any recorded regions beyond start of variable */
6828 removerecordregions(startloc);
6830 recordregion(startloc, expdest - (char *)stackblock(), quoted);
6834 if (subtype != VSNORMAL) { /* skip to end of alternative */
6837 unsigned char c = *p++;
6840 else if (c == CTLBACKQ) {
6842 argbackq = argbackq->next;
6843 } else if (c == CTLVAR) {
6844 if ((*p++ & VSTYPE) != VSNORMAL)
6846 } else if (c == CTLENDVAR) {
6856 * Break the argument string into pieces based upon IFS and add the
6857 * strings to the argument list. The regions of the string to be
6858 * searched for IFS characters have been stored by recordregion.
6861 ifsbreakup(char *string, struct arglist *arglist)
6863 struct ifsregion *ifsp;
6868 const char *ifs, *realifs;
6873 if (ifslastp != NULL) {
6876 realifs = ifsset() ? ifsval() : defifs;
6879 p = string + ifsp->begoff;
6880 nulonly = ifsp->nulonly;
6881 ifs = nulonly ? nullstr : realifs;
6883 while (p < string + ifsp->endoff) {
6885 if ((unsigned char)*p == CTLESC)
6887 if (!strchr(ifs, *p)) {
6892 ifsspc = (strchr(defifs, *p) != NULL);
6893 /* Ignore IFS whitespace at start */
6894 if (q == start && ifsspc) {
6900 sp = stzalloc(sizeof(*sp));
6902 *arglist->lastp = sp;
6903 arglist->lastp = &sp->next;
6907 if (p >= string + ifsp->endoff) {
6911 if ((unsigned char)*p == CTLESC)
6913 if (strchr(ifs, *p) == NULL) {
6917 if (strchr(defifs, *p) == NULL) {
6932 } while (ifsp != NULL);
6941 sp = stzalloc(sizeof(*sp));
6943 *arglist->lastp = sp;
6944 arglist->lastp = &sp->next;
6950 struct ifsregion *p;
6955 struct ifsregion *ifsp;
6961 ifsfirst.next = NULL;
6966 * Add a file name to the list.
6969 addfname(const char *name)
6973 sp = stzalloc(sizeof(*sp));
6974 sp->text = ststrdup(name);
6976 exparg.lastp = &sp->next;
6980 * Do metacharacter (i.e. *, ?, [...]) expansion.
6983 expmeta(char *expdir, char *enddir, char *name)
6999 for (p = name; esc = 0, *p; p += esc + 1) {
7000 if (*p == '*' || *p == '?')
7002 else if (*p == '[') {
7009 if (*q == '/' || *q == '\0')
7019 if (p[esc] == '/') {
7022 start = p + esc + 1;
7026 if (metaflag == 0) { /* we've reached the end of the file name */
7027 if (enddir != expdir)
7035 if (metaflag == 0 || lstat(expdir, &statb) >= 0)
7046 } while (p < start);
7048 if (enddir == expdir) {
7050 } else if (enddir == expdir + 1 && *expdir == '/') {
7059 if (enddir != expdir)
7061 if (*endname == 0) {
7074 while (!pending_int && (dp = readdir(dirp)) != NULL) {
7075 if (dp->d_name[0] == '.' && !matchdot)
7077 if (pmatch(start, dp->d_name)) {
7079 strcpy(enddir, dp->d_name);
7082 for (p = enddir, cp = dp->d_name; (*p++ = *cp++) != '\0';)
7085 expmeta(expdir, p, endname);
7091 endname[-esc - 1] = esc ? '\\' : '/';
7094 static struct strlist *
7095 msort(struct strlist *list, int len)
7097 struct strlist *p, *q = NULL;
7098 struct strlist **lpp;
7106 for (n = half; --n >= 0;) {
7110 q->next = NULL; /* terminate first half of list */
7111 q = msort(list, half); /* sort first half of list */
7112 p = msort(p, len - half); /* sort second half */
7115 #if ENABLE_LOCALE_SUPPORT
7116 if (strcoll(p->text, q->text) < 0)
7118 if (strcmp(p->text, q->text) < 0)
7142 * Sort the results of file name expansion. It calculates the number of
7143 * strings to sort and then calls msort (short for merge sort) to do the
7146 static struct strlist *
7147 expsort(struct strlist *str)
7153 for (sp = str; sp; sp = sp->next)
7155 return msort(str, len);
7159 expandmeta(struct strlist *str /*, int flag*/)
7161 static const char metachars[] ALIGN1 = {
7164 /* TODO - EXP_REDIR */
7168 struct strlist **savelastp;
7174 if (!strpbrk(str->text, metachars))
7176 savelastp = exparg.lastp;
7179 p = preglob(str->text, RMESCAPE_ALLOC | RMESCAPE_HEAP);
7181 int i = strlen(str->text);
7182 expdir = ckmalloc(i < 2048 ? 2048 : i); /* XXX */
7184 expmeta(expdir, expdir, p);
7189 if (exparg.lastp == savelastp) {
7194 *exparg.lastp = str;
7195 rmescapes(str->text, 0);
7196 exparg.lastp = &str->next;
7198 *exparg.lastp = NULL;
7199 *savelastp = sp = expsort(*savelastp);
7200 while (sp->next != NULL)
7202 exparg.lastp = &sp->next;
7209 * Perform variable substitution and command substitution on an argument,
7210 * placing the resulting list of arguments in arglist. If EXP_FULL is true,
7211 * perform splitting and file name expansion. When arglist is NULL, perform
7212 * here document expansion.
7215 expandarg(union node *arg, struct arglist *arglist, int flag)
7220 argbackq = arg->narg.backquote;
7221 STARTSTACKSTR(expdest);
7222 ifsfirst.next = NULL;
7224 TRACE(("expandarg: argstr('%s',flags:%x)\n", arg->narg.text, flag));
7225 argstr(arg->narg.text, flag,
7226 /* var_str_list: */ arglist ? arglist->list : NULL);
7227 p = _STPUTC('\0', expdest);
7229 if (arglist == NULL) {
7230 return; /* here document expanded */
7232 p = grabstackstr(p);
7233 TRACE(("expandarg: p:'%s'\n", p));
7234 exparg.lastp = &exparg.list;
7238 if (flag & EXP_FULL) {
7239 ifsbreakup(p, &exparg);
7240 *exparg.lastp = NULL;
7241 exparg.lastp = &exparg.list;
7242 expandmeta(exparg.list /*, flag*/);
7244 if (flag & EXP_REDIR) { /*XXX - for now, just remove escapes */
7246 TRACE(("expandarg: rmescapes:'%s'\n", p));
7248 sp = stzalloc(sizeof(*sp));
7251 exparg.lastp = &sp->next;
7255 *exparg.lastp = NULL;
7257 *arglist->lastp = exparg.list;
7258 arglist->lastp = exparg.lastp;
7263 * Expand shell variables and backquotes inside a here document.
7266 expandhere(union node *arg, int fd)
7269 expandarg(arg, (struct arglist *)NULL, EXP_QUOTED);
7270 full_write(fd, stackblock(), expdest - (char *)stackblock());
7274 * Returns true if the pattern matches the string.
7277 patmatch(char *pattern, const char *string)
7279 return pmatch(preglob(pattern, 0), string);
7283 * See if a pattern matches in a case statement.
7286 casematch(union node *pattern, char *val)
7288 struct stackmark smark;
7291 setstackmark(&smark);
7292 argbackq = pattern->narg.backquote;
7293 STARTSTACKSTR(expdest);
7295 argstr(pattern->narg.text, EXP_TILDE | EXP_CASE,
7296 /* var_str_list: */ NULL);
7297 STACKSTRNUL(expdest);
7298 result = patmatch(stackblock(), val);
7299 popstackmark(&smark);
7304 /* ============ find_command */
7308 int (*builtin)(int, char **) FAST_FUNC;
7309 /* unsigned flags; */
7311 #define IS_BUILTIN_SPECIAL(b) ((b)->name[0] & 1)
7312 /* "regular" builtins always take precedence over commands,
7313 * regardless of PATH=....%builtin... position */
7314 #define IS_BUILTIN_REGULAR(b) ((b)->name[0] & 2)
7315 #define IS_BUILTIN_ASSIGN(b) ((b)->name[0] & 4)
7318 smallint cmdtype; /* CMDxxx */
7321 /* index >= 0 for commands without path (slashes) */
7322 /* (TODO: what exactly does the value mean? PATH position?) */
7323 /* index == -1 for commands with slashes */
7324 /* index == (-2 - applet_no) for NOFORK applets */
7325 const struct builtincmd *cmd;
7326 struct funcnode *func;
7329 /* values of cmdtype */
7330 #define CMDUNKNOWN -1 /* no entry in table for command */
7331 #define CMDNORMAL 0 /* command is an executable program */
7332 #define CMDFUNCTION 1 /* command is a shell function */
7333 #define CMDBUILTIN 2 /* command is a shell builtin */
7335 /* action to find_command() */
7336 #define DO_ERR 0x01 /* prints errors */
7337 #define DO_ABS 0x02 /* checks absolute paths */
7338 #define DO_NOFUNC 0x04 /* don't return shell functions, for command */
7339 #define DO_ALTPATH 0x08 /* using alternate path */
7340 #define DO_ALTBLTIN 0x20 /* %builtin in alt. path */
7342 static void find_command(char *, struct cmdentry *, int, const char *);
7345 /* ============ Hashing commands */
7348 * When commands are first encountered, they are entered in a hash table.
7349 * This ensures that a full path search will not have to be done for them
7350 * on each invocation.
7352 * We should investigate converting to a linear search, even though that
7353 * would make the command name "hash" a misnomer.
7357 struct tblentry *next; /* next entry in hash chain */
7358 union param param; /* definition of builtin function */
7359 smallint cmdtype; /* CMDxxx */
7360 char rehash; /* if set, cd done since entry created */
7361 char cmdname[1]; /* name of command */
7364 static struct tblentry **cmdtable;
7365 #define INIT_G_cmdtable() do { \
7366 cmdtable = xzalloc(CMDTABLESIZE * sizeof(cmdtable[0])); \
7369 static int builtinloc = -1; /* index in path of %builtin, or -1 */
7373 tryexec(IF_FEATURE_SH_STANDALONE(int applet_no,) char *cmd, char **argv, char **envp)
7375 #if ENABLE_FEATURE_SH_STANDALONE
7376 if (applet_no >= 0) {
7377 if (APPLET_IS_NOEXEC(applet_no)) {
7381 run_applet_no_and_exit(applet_no, argv);
7383 /* re-exec ourselves with the new arguments */
7384 execve(bb_busybox_exec_path, argv, envp);
7385 /* If they called chroot or otherwise made the binary no longer
7386 * executable, fall through */
7393 execve(cmd, argv, envp);
7394 } while (errno == EINTR);
7396 execve(cmd, argv, envp);
7398 if (cmd == (char*) bb_busybox_exec_path) {
7399 /* We already visited ENOEXEC branch below, don't do it again */
7400 //TODO: try execve(initial_argv0_of_shell, argv, envp) before giving up?
7404 if (errno == ENOEXEC) {
7405 /* Run "cmd" as a shell script:
7406 * http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html
7407 * "If the execve() function fails with ENOEXEC, the shell
7408 * shall execute a command equivalent to having a shell invoked
7409 * with the command name as its first operand,
7410 * with any remaining arguments passed to the new shell"
7412 * That is, do not use $SHELL, user's shell, or /bin/sh;
7413 * just call ourselves.
7415 * Note that bash reads ~80 chars of the file, and if it sees
7416 * a zero byte before it sees newline, it doesn't try to
7417 * interpret it, but fails with "cannot execute binary file"
7418 * message and exit code 126. For one, this prevents attempts
7419 * to interpret foreign ELF binaries as shell scripts.
7424 for (ap = argv; *ap; ap++)
7426 new = ckmalloc((ap - argv + 2) * sizeof(new[0]));
7427 new[0] = (char*) "ash";
7430 while ((*ap++ = *++argv) != NULL)
7432 cmd = (char*) bb_busybox_exec_path;
7439 * Exec a program. Never returns. If you change this routine, you may
7440 * have to change the find_command routine as well.
7442 static void shellexec(char **, const char *, int) NORETURN;
7444 shellexec(char **argv, const char *path, int idx)
7450 int applet_no = -1; /* used only by FEATURE_SH_STANDALONE */
7452 clearredir(/*drop:*/ 1);
7453 envp = listvars(VEXPORT, VUNSET, /*end:*/ NULL);
7454 if (strchr(argv[0], '/') != NULL
7455 #if ENABLE_FEATURE_SH_STANDALONE
7456 || (applet_no = find_applet_by_name(argv[0])) >= 0
7459 tryexec(IF_FEATURE_SH_STANDALONE(applet_no,) argv[0], argv, envp);
7460 if (applet_no >= 0) {
7461 /* We tried execing ourself, but it didn't work.
7462 * Maybe /proc/self/exe doesn't exist?
7471 while ((cmdname = path_advance(&path, argv[0])) != NULL) {
7472 if (--idx < 0 && pathopt == NULL) {
7473 tryexec(IF_FEATURE_SH_STANDALONE(-1,) cmdname, argv, envp);
7474 if (errno != ENOENT && errno != ENOTDIR)
7481 /* Map to POSIX errors */
7493 exitstatus = exerrno;
7494 TRACE(("shellexec failed for %s, errno %d, suppress_int %d\n",
7495 argv[0], e, suppress_int));
7496 ash_msg_and_raise(EXEXEC, "%s: %s", argv[0], errmsg(e, "not found"));
7501 printentry(struct tblentry *cmdp)
7507 idx = cmdp->param.index;
7510 name = path_advance(&path, cmdp->cmdname);
7512 } while (--idx >= 0);
7513 out1fmt("%s%s\n", name, (cmdp->rehash ? "*" : nullstr));
7517 * Clear out command entries. The argument specifies the first entry in
7518 * PATH which has changed.
7521 clearcmdentry(int firstchange)
7523 struct tblentry **tblp;
7524 struct tblentry **pp;
7525 struct tblentry *cmdp;
7528 for (tblp = cmdtable; tblp < &cmdtable[CMDTABLESIZE]; tblp++) {
7530 while ((cmdp = *pp) != NULL) {
7531 if ((cmdp->cmdtype == CMDNORMAL &&
7532 cmdp->param.index >= firstchange)
7533 || (cmdp->cmdtype == CMDBUILTIN &&
7534 builtinloc >= firstchange)
7547 * Locate a command in the command hash table. If "add" is nonzero,
7548 * add the command to the table if it is not already present. The
7549 * variable "lastcmdentry" is set to point to the address of the link
7550 * pointing to the entry, so that delete_cmd_entry can delete the
7553 * Interrupts must be off if called with add != 0.
7555 static struct tblentry **lastcmdentry;
7557 static struct tblentry *
7558 cmdlookup(const char *name, int add)
7560 unsigned int hashval;
7562 struct tblentry *cmdp;
7563 struct tblentry **pp;
7566 hashval = (unsigned char)*p << 4;
7568 hashval += (unsigned char)*p++;
7570 pp = &cmdtable[hashval % CMDTABLESIZE];
7571 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7572 if (strcmp(cmdp->cmdname, name) == 0)
7576 if (add && cmdp == NULL) {
7577 cmdp = *pp = ckzalloc(sizeof(struct tblentry)
7579 /* + 1 - already done because
7580 * tblentry::cmdname is char[1] */);
7581 /*cmdp->next = NULL; - ckzalloc did it */
7582 cmdp->cmdtype = CMDUNKNOWN;
7583 strcpy(cmdp->cmdname, name);
7590 * Delete the command entry returned on the last lookup.
7593 delete_cmd_entry(void)
7595 struct tblentry *cmdp;
7598 cmdp = *lastcmdentry;
7599 *lastcmdentry = cmdp->next;
7600 if (cmdp->cmdtype == CMDFUNCTION)
7601 freefunc(cmdp->param.func);
7607 * Add a new command entry, replacing any existing command entry for
7608 * the same name - except special builtins.
7611 addcmdentry(char *name, struct cmdentry *entry)
7613 struct tblentry *cmdp;
7615 cmdp = cmdlookup(name, 1);
7616 if (cmdp->cmdtype == CMDFUNCTION) {
7617 freefunc(cmdp->param.func);
7619 cmdp->cmdtype = entry->cmdtype;
7620 cmdp->param = entry->u;
7624 static int FAST_FUNC
7625 hashcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
7627 struct tblentry **pp;
7628 struct tblentry *cmdp;
7630 struct cmdentry entry;
7633 if (nextopt("r") != '\0') {
7638 if (*argptr == NULL) {
7639 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
7640 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7641 if (cmdp->cmdtype == CMDNORMAL)
7649 while ((name = *argptr) != NULL) {
7650 cmdp = cmdlookup(name, 0);
7652 && (cmdp->cmdtype == CMDNORMAL
7653 || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))
7657 find_command(name, &entry, DO_ERR, pathval());
7658 if (entry.cmdtype == CMDUNKNOWN)
7666 * Called when a cd is done. Marks all commands so the next time they
7667 * are executed they will be rehashed.
7672 struct tblentry **pp;
7673 struct tblentry *cmdp;
7675 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
7676 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7677 if (cmdp->cmdtype == CMDNORMAL
7678 || (cmdp->cmdtype == CMDBUILTIN
7679 && !IS_BUILTIN_REGULAR(cmdp->param.cmd)
7689 * Fix command hash table when PATH changed.
7690 * Called before PATH is changed. The argument is the new value of PATH;
7691 * pathval() still returns the old value at this point.
7692 * Called with interrupts off.
7694 static void FAST_FUNC
7695 changepath(const char *new)
7703 firstchange = 9999; /* assume no change */
7709 if ((*old == '\0' && *new == ':')
7710 || (*old == ':' && *new == '\0')
7714 old = new; /* ignore subsequent differences */
7718 if (*new == '%' && idx_bltin < 0 && prefix(new + 1, "builtin"))
7725 if (builtinloc < 0 && idx_bltin >= 0)
7726 builtinloc = idx_bltin; /* zap builtins */
7727 if (builtinloc >= 0 && idx_bltin < 0)
7729 clearcmdentry(firstchange);
7730 builtinloc = idx_bltin;
7755 #if ENABLE_ASH_BASH_COMPAT
7766 typedef smallint token_id_t;
7768 /* first char is indicating which tokens mark the end of a list */
7769 static const char *const tokname_array[] = {
7783 #define KWDOFFSET 13
7784 /* the following are keywords */
7794 #if ENABLE_ASH_BASH_COMPAT
7806 /* Wrapper around strcmp for qsort/bsearch/... */
7808 pstrcmp(const void *a, const void *b)
7810 return strcmp((char*) a, (*(char**) b) + 1);
7813 static const char *const *
7814 findkwd(const char *s)
7816 return bsearch(s, tokname_array + KWDOFFSET,
7817 ARRAY_SIZE(tokname_array) - KWDOFFSET,
7818 sizeof(tokname_array[0]), pstrcmp);
7822 * Locate and print what a word is...
7825 describe_command(char *command, const char *path, int describe_command_verbose)
7827 struct cmdentry entry;
7828 struct tblentry *cmdp;
7829 #if ENABLE_ASH_ALIAS
7830 const struct alias *ap;
7833 path = path ? path : pathval();
7835 if (describe_command_verbose) {
7839 /* First look at the keywords */
7840 if (findkwd(command)) {
7841 out1str(describe_command_verbose ? " is a shell keyword" : command);
7845 #if ENABLE_ASH_ALIAS
7846 /* Then look at the aliases */
7847 ap = lookupalias(command, 0);
7849 if (!describe_command_verbose) {
7854 out1fmt(" is an alias for %s", ap->val);
7858 /* Then check if it is a tracked alias */
7859 cmdp = cmdlookup(command, 0);
7861 entry.cmdtype = cmdp->cmdtype;
7862 entry.u = cmdp->param;
7864 /* Finally use brute force */
7865 find_command(command, &entry, DO_ABS, path);
7868 switch (entry.cmdtype) {
7870 int j = entry.u.index;
7876 p = path_advance(&path, command);
7880 if (describe_command_verbose) {
7882 (cmdp ? " a tracked alias for" : nullstr), p
7891 if (describe_command_verbose) {
7892 out1str(" is a shell function");
7899 if (describe_command_verbose) {
7900 out1fmt(" is a %sshell builtin",
7901 IS_BUILTIN_SPECIAL(entry.u.cmd) ?
7902 "special " : nullstr
7910 if (describe_command_verbose) {
7911 out1str(": not found\n");
7920 static int FAST_FUNC
7921 typecmd(int argc UNUSED_PARAM, char **argv)
7927 /* type -p ... ? (we don't bother checking for 'p') */
7928 if (argv[1] && argv[1][0] == '-') {
7933 err |= describe_command(argv[i++], NULL, verbose);
7938 #if ENABLE_ASH_CMDCMD
7939 static int FAST_FUNC
7940 commandcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
7947 const char *path = NULL;
7949 while ((c = nextopt("pvV")) != '\0')
7951 verify |= VERIFY_VERBOSE;
7953 verify |= VERIFY_BRIEF;
7959 path = bb_default_path;
7960 /* Mimic bash: just "command -v" doesn't complain, it's a nop */
7961 if (verify && (*argptr != NULL)) {
7962 return describe_command(*argptr, path, verify - VERIFY_BRIEF);
7970 /* ============ eval.c */
7972 static int funcblocksize; /* size of structures in function */
7973 static int funcstringsize; /* size of strings in node */
7974 static void *funcblock; /* block to allocate function from */
7975 static char *funcstring; /* block to allocate strings from */
7977 /* flags in argument to evaltree */
7978 #define EV_EXIT 01 /* exit after evaluating tree */
7979 #define EV_TESTED 02 /* exit status is checked; ignore -e flag */
7980 #define EV_BACKCMD 04 /* command executing within back quotes */
7982 static const uint8_t nodesize[N_NUMBER] ALIGN1 = {
7983 [NCMD ] = SHELL_ALIGN(sizeof(struct ncmd)),
7984 [NPIPE ] = SHELL_ALIGN(sizeof(struct npipe)),
7985 [NREDIR ] = SHELL_ALIGN(sizeof(struct nredir)),
7986 [NBACKGND ] = SHELL_ALIGN(sizeof(struct nredir)),
7987 [NSUBSHELL] = SHELL_ALIGN(sizeof(struct nredir)),
7988 [NAND ] = SHELL_ALIGN(sizeof(struct nbinary)),
7989 [NOR ] = SHELL_ALIGN(sizeof(struct nbinary)),
7990 [NSEMI ] = SHELL_ALIGN(sizeof(struct nbinary)),
7991 [NIF ] = SHELL_ALIGN(sizeof(struct nif)),
7992 [NWHILE ] = SHELL_ALIGN(sizeof(struct nbinary)),
7993 [NUNTIL ] = SHELL_ALIGN(sizeof(struct nbinary)),
7994 [NFOR ] = SHELL_ALIGN(sizeof(struct nfor)),
7995 [NCASE ] = SHELL_ALIGN(sizeof(struct ncase)),
7996 [NCLIST ] = SHELL_ALIGN(sizeof(struct nclist)),
7997 [NDEFUN ] = SHELL_ALIGN(sizeof(struct narg)),
7998 [NARG ] = SHELL_ALIGN(sizeof(struct narg)),
7999 [NTO ] = SHELL_ALIGN(sizeof(struct nfile)),
8000 #if ENABLE_ASH_BASH_COMPAT
8001 [NTO2 ] = SHELL_ALIGN(sizeof(struct nfile)),
8003 [NCLOBBER ] = SHELL_ALIGN(sizeof(struct nfile)),
8004 [NFROM ] = SHELL_ALIGN(sizeof(struct nfile)),
8005 [NFROMTO ] = SHELL_ALIGN(sizeof(struct nfile)),
8006 [NAPPEND ] = SHELL_ALIGN(sizeof(struct nfile)),
8007 [NTOFD ] = SHELL_ALIGN(sizeof(struct ndup)),
8008 [NFROMFD ] = SHELL_ALIGN(sizeof(struct ndup)),
8009 [NHERE ] = SHELL_ALIGN(sizeof(struct nhere)),
8010 [NXHERE ] = SHELL_ALIGN(sizeof(struct nhere)),
8011 [NNOT ] = SHELL_ALIGN(sizeof(struct nnot)),
8014 static void calcsize(union node *n);
8017 sizenodelist(struct nodelist *lp)
8020 funcblocksize += SHELL_ALIGN(sizeof(struct nodelist));
8027 calcsize(union node *n)
8031 funcblocksize += nodesize[n->type];
8034 calcsize(n->ncmd.redirect);
8035 calcsize(n->ncmd.args);
8036 calcsize(n->ncmd.assign);
8039 sizenodelist(n->npipe.cmdlist);
8044 calcsize(n->nredir.redirect);
8045 calcsize(n->nredir.n);
8052 calcsize(n->nbinary.ch2);
8053 calcsize(n->nbinary.ch1);
8056 calcsize(n->nif.elsepart);
8057 calcsize(n->nif.ifpart);
8058 calcsize(n->nif.test);
8061 funcstringsize += strlen(n->nfor.var) + 1;
8062 calcsize(n->nfor.body);
8063 calcsize(n->nfor.args);
8066 calcsize(n->ncase.cases);
8067 calcsize(n->ncase.expr);
8070 calcsize(n->nclist.body);
8071 calcsize(n->nclist.pattern);
8072 calcsize(n->nclist.next);
8076 sizenodelist(n->narg.backquote);
8077 funcstringsize += strlen(n->narg.text) + 1;
8078 calcsize(n->narg.next);
8081 #if ENABLE_ASH_BASH_COMPAT
8088 calcsize(n->nfile.fname);
8089 calcsize(n->nfile.next);
8093 calcsize(n->ndup.vname);
8094 calcsize(n->ndup.next);
8098 calcsize(n->nhere.doc);
8099 calcsize(n->nhere.next);
8102 calcsize(n->nnot.com);
8108 nodeckstrdup(char *s)
8110 char *rtn = funcstring;
8112 strcpy(funcstring, s);
8113 funcstring += strlen(s) + 1;
8117 static union node *copynode(union node *);
8119 static struct nodelist *
8120 copynodelist(struct nodelist *lp)
8122 struct nodelist *start;
8123 struct nodelist **lpp;
8128 funcblock = (char *) funcblock + SHELL_ALIGN(sizeof(struct nodelist));
8129 (*lpp)->n = copynode(lp->n);
8131 lpp = &(*lpp)->next;
8138 copynode(union node *n)
8145 funcblock = (char *) funcblock + nodesize[n->type];
8149 new->ncmd.redirect = copynode(n->ncmd.redirect);
8150 new->ncmd.args = copynode(n->ncmd.args);
8151 new->ncmd.assign = copynode(n->ncmd.assign);
8154 new->npipe.cmdlist = copynodelist(n->npipe.cmdlist);
8155 new->npipe.pipe_backgnd = n->npipe.pipe_backgnd;
8160 new->nredir.redirect = copynode(n->nredir.redirect);
8161 new->nredir.n = copynode(n->nredir.n);
8168 new->nbinary.ch2 = copynode(n->nbinary.ch2);
8169 new->nbinary.ch1 = copynode(n->nbinary.ch1);
8172 new->nif.elsepart = copynode(n->nif.elsepart);
8173 new->nif.ifpart = copynode(n->nif.ifpart);
8174 new->nif.test = copynode(n->nif.test);
8177 new->nfor.var = nodeckstrdup(n->nfor.var);
8178 new->nfor.body = copynode(n->nfor.body);
8179 new->nfor.args = copynode(n->nfor.args);
8182 new->ncase.cases = copynode(n->ncase.cases);
8183 new->ncase.expr = copynode(n->ncase.expr);
8186 new->nclist.body = copynode(n->nclist.body);
8187 new->nclist.pattern = copynode(n->nclist.pattern);
8188 new->nclist.next = copynode(n->nclist.next);
8192 new->narg.backquote = copynodelist(n->narg.backquote);
8193 new->narg.text = nodeckstrdup(n->narg.text);
8194 new->narg.next = copynode(n->narg.next);
8197 #if ENABLE_ASH_BASH_COMPAT
8204 new->nfile.fname = copynode(n->nfile.fname);
8205 new->nfile.fd = n->nfile.fd;
8206 new->nfile.next = copynode(n->nfile.next);
8210 new->ndup.vname = copynode(n->ndup.vname);
8211 new->ndup.dupfd = n->ndup.dupfd;
8212 new->ndup.fd = n->ndup.fd;
8213 new->ndup.next = copynode(n->ndup.next);
8217 new->nhere.doc = copynode(n->nhere.doc);
8218 new->nhere.fd = n->nhere.fd;
8219 new->nhere.next = copynode(n->nhere.next);
8222 new->nnot.com = copynode(n->nnot.com);
8225 new->type = n->type;
8230 * Make a copy of a parse tree.
8232 static struct funcnode *
8233 copyfunc(union node *n)
8238 funcblocksize = offsetof(struct funcnode, n);
8241 blocksize = funcblocksize;
8242 f = ckmalloc(blocksize + funcstringsize);
8243 funcblock = (char *) f + offsetof(struct funcnode, n);
8244 funcstring = (char *) f + blocksize;
8251 * Define a shell function.
8254 defun(char *name, union node *func)
8256 struct cmdentry entry;
8259 entry.cmdtype = CMDFUNCTION;
8260 entry.u.func = copyfunc(func);
8261 addcmdentry(name, &entry);
8265 /* Reasons for skipping commands (see comment on breakcmd routine) */
8266 #define SKIPBREAK (1 << 0)
8267 #define SKIPCONT (1 << 1)
8268 #define SKIPFUNC (1 << 2)
8269 #define SKIPFILE (1 << 3)
8270 #define SKIPEVAL (1 << 4)
8271 static smallint evalskip; /* set to SKIPxxx if we are skipping commands */
8272 static int skipcount; /* number of levels to skip */
8273 static int funcnest; /* depth of function calls */
8274 static int loopnest; /* current loop nesting level */
8276 /* Forward decl way out to parsing code - dotrap needs it */
8277 static int evalstring(char *s, int mask);
8279 /* Called to execute a trap.
8280 * Single callsite - at the end of evaltree().
8281 * If we return non-zero, evaltree raises EXEXIT exception.
8283 * Perhaps we should avoid entering new trap handlers
8284 * while we are executing a trap handler. [is it a TODO?]
8293 savestatus = exitstatus;
8297 TRACE(("dotrap entered\n"));
8298 for (sig = 1, g = gotsig; sig < NSIG; sig++, g++) {
8305 /* non-trapped SIGINT is handled separately by raise_interrupt,
8306 * don't upset it by resetting gotsig[SIGINT-1] */
8307 if (sig == SIGINT && !t)
8310 TRACE(("sig %d is active, will run handler '%s'\n", sig, t));
8314 want_exexit = evalstring(t, SKIPEVAL);
8315 exitstatus = savestatus;
8317 TRACE(("dotrap returns %d\n", want_exexit));
8322 TRACE(("dotrap returns 0\n"));
8326 /* forward declarations - evaluation is fairly recursive business... */
8327 static void evalloop(union node *, int);
8328 static void evalfor(union node *, int);
8329 static void evalcase(union node *, int);
8330 static void evalsubshell(union node *, int);
8331 static void expredir(union node *);
8332 static void evalpipe(union node *, int);
8333 static void evalcommand(union node *, int);
8334 static int evalbltin(const struct builtincmd *, int, char **);
8335 static void prehash(union node *);
8338 * Evaluate a parse tree. The value is left in the global variable
8342 evaltree(union node *n, int flags)
8344 struct jmploc *volatile savehandler = exception_handler;
8345 struct jmploc jmploc;
8347 void (*evalfn)(union node *, int);
8351 SAVE_INT(int_level);
8354 TRACE(("evaltree(NULL) called\n"));
8357 TRACE(("evaltree(%p: %d, %d) called\n", n, n->type, flags));
8359 exception_handler = &jmploc;
8361 int err = setjmp(jmploc.loc);
8363 /* if it was a signal, check for trap handlers */
8364 if (exception_type == EXSIG) {
8365 TRACE(("exception %d (EXSIG) in evaltree, err=%d\n",
8366 exception_type, err));
8369 /* continue on the way out */
8370 TRACE(("exception %d in evaltree, propagating err=%d\n",
8371 exception_type, err));
8372 exception_handler = savehandler;
8373 longjmp(exception_handler->loc, err);
8380 out1fmt("Node type = %d\n", n->type);
8385 evaltree(n->nnot.com, EV_TESTED);
8386 status = !exitstatus;
8389 expredir(n->nredir.redirect);
8390 status = redirectsafe(n->nredir.redirect, REDIR_PUSH);
8392 evaltree(n->nredir.n, flags & EV_TESTED);
8393 status = exitstatus;
8395 popredir(/*drop:*/ 0, /*restore:*/ 0 /* not sure */);
8398 evalfn = evalcommand;
8400 if (eflag && !(flags & EV_TESTED))
8412 evalfn = evalsubshell;
8425 #error NAND + 1 != NOR
8427 #if NOR + 1 != NSEMI
8428 #error NOR + 1 != NSEMI
8430 unsigned is_or = n->type - NAND;
8433 (flags | ((is_or >> 1) - 1)) & EV_TESTED
8435 if ((!exitstatus) == is_or)
8448 evaltree(n->nif.test, EV_TESTED);
8451 if (exitstatus == 0) {
8455 if (n->nif.elsepart) {
8456 n = n->nif.elsepart;
8461 defun(n->narg.text, n->narg.next);
8465 exitstatus = status;
8470 exception_handler = savehandler;
8473 /* Order of checks below is important:
8474 * signal handlers trigger before exit caused by "set -e".
8476 if (pending_sig && dotrap())
8478 if (checkexit & exitstatus)
8479 evalskip |= SKIPEVAL;
8481 if (flags & EV_EXIT) {
8483 raise_exception(EXEXIT);
8486 RESTORE_INT(int_level);
8487 TRACE(("leaving evaltree (no interrupts)\n"));
8490 #if !defined(__alpha__) || (defined(__GNUC__) && __GNUC__ >= 3)
8493 void evaltreenr(union node *, int) __attribute__ ((alias("evaltree"),__noreturn__));
8496 evalloop(union node *n, int flags)
8506 evaltree(n->nbinary.ch1, EV_TESTED);
8509 if (evalskip == SKIPCONT && --skipcount <= 0) {
8513 if (evalskip == SKIPBREAK && --skipcount <= 0)
8518 if (n->type != NWHILE)
8522 evaltree(n->nbinary.ch2, flags);
8523 status = exitstatus;
8528 exitstatus = status;
8532 evalfor(union node *n, int flags)
8534 struct arglist arglist;
8537 struct stackmark smark;
8539 setstackmark(&smark);
8540 arglist.list = NULL;
8541 arglist.lastp = &arglist.list;
8542 for (argp = n->nfor.args; argp; argp = argp->narg.next) {
8543 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
8548 *arglist.lastp = NULL;
8553 for (sp = arglist.list; sp; sp = sp->next) {
8554 setvar0(n->nfor.var, sp->text);
8555 evaltree(n->nfor.body, flags);
8557 if (evalskip == SKIPCONT && --skipcount <= 0) {
8561 if (evalskip == SKIPBREAK && --skipcount <= 0)
8568 popstackmark(&smark);
8572 evalcase(union node *n, int flags)
8576 struct arglist arglist;
8577 struct stackmark smark;
8579 setstackmark(&smark);
8580 arglist.list = NULL;
8581 arglist.lastp = &arglist.list;
8582 expandarg(n->ncase.expr, &arglist, EXP_TILDE);
8584 for (cp = n->ncase.cases; cp && evalskip == 0; cp = cp->nclist.next) {
8585 for (patp = cp->nclist.pattern; patp; patp = patp->narg.next) {
8586 if (casematch(patp, arglist.list->text)) {
8587 if (evalskip == 0) {
8588 evaltree(cp->nclist.body, flags);
8595 popstackmark(&smark);
8599 * Kick off a subshell to evaluate a tree.
8602 evalsubshell(union node *n, int flags)
8605 int backgnd = (n->type == NBACKGND);
8608 expredir(n->nredir.redirect);
8609 if (!backgnd && (flags & EV_EXIT) && !may_have_traps)
8612 jp = makejob(/*n,*/ 1);
8613 if (forkshell(jp, n, backgnd) == 0) {
8618 flags &= ~EV_TESTED;
8620 redirect(n->nredir.redirect, 0);
8621 evaltreenr(n->nredir.n, flags);
8626 status = waitforjob(jp);
8627 exitstatus = status;
8632 * Compute the names of the files in a redirection list.
8634 static void fixredir(union node *, const char *, int);
8636 expredir(union node *n)
8640 for (redir = n; redir; redir = redir->nfile.next) {
8644 fn.lastp = &fn.list;
8645 switch (redir->type) {
8649 #if ENABLE_ASH_BASH_COMPAT
8654 expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR);
8655 TRACE(("expredir expanded to '%s'\n", fn.list->text));
8656 #if ENABLE_ASH_BASH_COMPAT
8660 // By the design of stack allocator, the loop of this kind:
8661 // while true; do while true; do break; done </dev/null; done
8662 // will look like a memory leak: ash plans to free expfname's
8663 // of "/dev/null" as soon as it finishes running the loop
8664 // (in this case, never).
8665 // This "fix" is wrong:
8666 if (redir->nfile.expfname)
8667 stunalloc(redir->nfile.expfname);
8668 // It results in corrupted state of stacked allocations.
8670 redir->nfile.expfname = fn.list->text;
8673 case NTOFD: /* >& */
8674 if (redir->ndup.vname) {
8675 expandarg(redir->ndup.vname, &fn, EXP_FULL | EXP_TILDE);
8676 if (fn.list == NULL)
8677 ash_msg_and_raise_error("redir error");
8678 #if ENABLE_ASH_BASH_COMPAT
8679 //FIXME: we used expandarg with different args!
8680 if (!isdigit_str9(fn.list->text)) {
8681 /* >&file, not >&fd */
8682 if (redir->nfile.fd != 1) /* 123>&file - BAD */
8683 ash_msg_and_raise_error("redir error");
8685 goto store_expfname;
8688 fixredir(redir, fn.list->text, 1);
8696 * Evaluate a pipeline. All the processes in the pipeline are children
8697 * of the process creating the pipeline. (This differs from some versions
8698 * of the shell, which make the last process in a pipeline the parent
8702 evalpipe(union node *n, int flags)
8705 struct nodelist *lp;
8710 TRACE(("evalpipe(0x%lx) called\n", (long)n));
8712 for (lp = n->npipe.cmdlist; lp; lp = lp->next)
8716 jp = makejob(/*n,*/ pipelen);
8718 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
8722 if (pipe(pip) < 0) {
8724 ash_msg_and_raise_error("pipe call failed");
8727 if (forkshell(jp, lp->n, n->npipe.pipe_backgnd) == 0) {
8740 evaltreenr(lp->n, flags);
8746 /* Don't want to trigger debugging */
8750 if (n->npipe.pipe_backgnd == 0) {
8751 exitstatus = waitforjob(jp);
8752 TRACE(("evalpipe: job done exit status %d\n", exitstatus));
8758 * Controls whether the shell is interactive or not.
8761 setinteractive(int on)
8763 static smallint is_interactive;
8765 if (++on == is_interactive)
8767 is_interactive = on;
8771 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
8772 if (is_interactive > 1) {
8773 /* Looks like they want an interactive shell */
8774 static smallint did_banner;
8777 /* note: ash and hush share this string */
8778 out1fmt("\n\n%s %s\n"
8779 IF_ASH_HELP("Enter 'help' for a list of built-in commands.\n")
8782 "built-in shell (ash)"
8796 setinteractive(iflag);
8798 #if ENABLE_FEATURE_EDITING_VI
8800 line_input_state->flags |= VI_MODE;
8802 line_input_state->flags &= ~VI_MODE;
8804 viflag = 0; /* forcibly keep the option off */
8808 static struct localvar *localvars;
8811 * Called after a function returns.
8812 * Interrupts must be off.
8817 struct localvar *lvp;
8820 while ((lvp = localvars) != NULL) {
8821 localvars = lvp->next;
8823 TRACE(("poplocalvar %s\n", vp ? vp->var_text : "-"));
8824 if (vp == NULL) { /* $- saved */
8825 memcpy(optlist, lvp->text, sizeof(optlist));
8826 free((char*)lvp->text);
8828 } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) {
8829 unsetvar(vp->var_text);
8832 vp->var_func(var_end(lvp->text));
8833 if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
8834 free((char*)vp->var_text);
8835 vp->flags = lvp->flags;
8836 vp->var_text = lvp->text;
8843 evalfun(struct funcnode *func, int argc, char **argv, int flags)
8845 volatile struct shparam saveparam;
8846 struct localvar *volatile savelocalvars;
8847 struct jmploc *volatile savehandler;
8848 struct jmploc jmploc;
8851 saveparam = shellparam;
8852 savelocalvars = localvars;
8853 e = setjmp(jmploc.loc);
8858 savehandler = exception_handler;
8859 exception_handler = &jmploc;
8861 shellparam.malloced = 0;
8865 shellparam.nparam = argc - 1;
8866 shellparam.p = argv + 1;
8867 #if ENABLE_ASH_GETOPTS
8868 shellparam.optind = 1;
8869 shellparam.optoff = -1;
8871 evaltree(&func->n, flags & EV_TESTED);
8877 localvars = savelocalvars;
8878 freeparam(&shellparam);
8879 shellparam = saveparam;
8880 exception_handler = savehandler;
8882 evalskip &= ~SKIPFUNC;
8886 #if ENABLE_ASH_CMDCMD
8888 parse_command_args(char **argv, const char **path)
8901 if (c == '-' && !*cp) {
8909 *path = bb_default_path;
8912 /* run 'typecmd' for other options */
8923 * Make a variable a local variable. When a variable is made local, it's
8924 * value and flags are saved in a localvar structure. The saved values
8925 * will be restored when the shell function returns. We handle the name
8926 * "-" as a special case: it makes changes to "set +-options" local
8927 * (options will be restored on return from the function).
8932 struct localvar *lvp;
8935 char *eq = strchr(name, '=');
8938 /* Cater for duplicate "local". Examples:
8939 * x=0; f() { local x=1; echo $x; local x; echo $x; }; f; echo $x
8940 * x=0; f() { local x=1; echo $x; local x=2; echo $x; }; f; echo $x
8944 if (lvp->vp && varcmp(lvp->vp->var_text, name) == 0) {
8948 * it's a duplicate "local VAR" declaration, do nothing
8955 lvp = ckzalloc(sizeof(*lvp));
8956 if (LONE_DASH(name)) {
8958 p = ckmalloc(sizeof(optlist));
8959 lvp->text = memcpy(p, optlist, sizeof(optlist));
8962 vpp = hashvar(name);
8963 vp = *findvar(vpp, name);
8965 /* variable did not exist yet */
8967 setvareq(name, VSTRFIXED);
8969 setvar(name, NULL, VSTRFIXED);
8970 vp = *vpp; /* the new variable */
8971 lvp->flags = VUNSET;
8973 lvp->text = vp->var_text;
8974 lvp->flags = vp->flags;
8975 /* make sure neither "struct var" nor string gets freed
8976 * during (un)setting:
8978 vp->flags |= VSTRFIXED|VTEXTFIXED;
8982 /* "local VAR" unsets VAR: */
8983 setvar0(name, NULL);
8987 lvp->next = localvars;
8993 * The "local" command.
8995 static int FAST_FUNC
8996 localcmd(int argc UNUSED_PARAM, char **argv)
9001 ash_msg_and_raise_error("not in a function");
9004 while ((name = *argv++) != NULL) {
9010 static int FAST_FUNC
9011 falsecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
9016 static int FAST_FUNC
9017 truecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
9022 static int FAST_FUNC
9023 execcmd(int argc UNUSED_PARAM, char **argv)
9026 iflag = 0; /* exit on error */
9029 /* We should set up signals for "exec CMD"
9030 * the same way as for "CMD" without "exec".
9031 * But optschanged->setinteractive->setsignal
9032 * still thought we are a root shell. Therefore, for example,
9033 * SIGQUIT is still set to IGN. Fix it:
9037 /*setsignal(SIGTERM); - unnecessary because of iflag=0 */
9038 /*setsignal(SIGTSTP); - unnecessary because of mflag=0 */
9039 /*setsignal(SIGTTOU); - unnecessary because of mflag=0 */
9041 shellexec(argv + 1, pathval(), 0);
9048 * The return command.
9050 static int FAST_FUNC
9051 returncmd(int argc UNUSED_PARAM, char **argv)
9054 * If called outside a function, do what ksh does;
9055 * skip the rest of the file.
9057 evalskip = funcnest ? SKIPFUNC : SKIPFILE;
9058 return argv[1] ? number(argv[1]) : exitstatus;
9061 /* Forward declarations for builtintab[] */
9062 static int breakcmd(int, char **) FAST_FUNC;
9063 static int dotcmd(int, char **) FAST_FUNC;
9064 static int evalcmd(int, char **) FAST_FUNC;
9065 static int exitcmd(int, char **) FAST_FUNC;
9066 static int exportcmd(int, char **) FAST_FUNC;
9067 #if ENABLE_ASH_GETOPTS
9068 static int getoptscmd(int, char **) FAST_FUNC;
9071 static int helpcmd(int, char **) FAST_FUNC;
9074 static int historycmd(int, char **) FAST_FUNC;
9076 #if ENABLE_SH_MATH_SUPPORT
9077 static int letcmd(int, char **) FAST_FUNC;
9079 static int readcmd(int, char **) FAST_FUNC;
9080 static int setcmd(int, char **) FAST_FUNC;
9081 static int shiftcmd(int, char **) FAST_FUNC;
9082 static int timescmd(int, char **) FAST_FUNC;
9083 static int trapcmd(int, char **) FAST_FUNC;
9084 static int umaskcmd(int, char **) FAST_FUNC;
9085 static int unsetcmd(int, char **) FAST_FUNC;
9086 static int ulimitcmd(int, char **) FAST_FUNC;
9088 #define BUILTIN_NOSPEC "0"
9089 #define BUILTIN_SPECIAL "1"
9090 #define BUILTIN_REGULAR "2"
9091 #define BUILTIN_SPEC_REG "3"
9092 #define BUILTIN_ASSIGN "4"
9093 #define BUILTIN_SPEC_ASSG "5"
9094 #define BUILTIN_REG_ASSG "6"
9095 #define BUILTIN_SPEC_REG_ASSG "7"
9097 /* Stubs for calling non-FAST_FUNC's */
9098 #if ENABLE_ASH_BUILTIN_ECHO
9099 static int FAST_FUNC echocmd(int argc, char **argv) { return echo_main(argc, argv); }
9101 #if ENABLE_ASH_BUILTIN_PRINTF
9102 static int FAST_FUNC printfcmd(int argc, char **argv) { return printf_main(argc, argv); }
9104 #if ENABLE_ASH_BUILTIN_TEST
9105 static int FAST_FUNC testcmd(int argc, char **argv) { return test_main(argc, argv); }
9108 /* Keep these in proper order since it is searched via bsearch() */
9109 static const struct builtincmd builtintab[] = {
9110 { BUILTIN_SPEC_REG "." , dotcmd },
9111 { BUILTIN_SPEC_REG ":" , truecmd },
9112 #if ENABLE_ASH_BUILTIN_TEST
9113 { BUILTIN_REGULAR "[" , testcmd },
9114 #if ENABLE_ASH_BASH_COMPAT
9115 { BUILTIN_REGULAR "[[" , testcmd },
9118 #if ENABLE_ASH_ALIAS
9119 { BUILTIN_REG_ASSG "alias" , aliascmd },
9122 { BUILTIN_REGULAR "bg" , fg_bgcmd },
9124 { BUILTIN_SPEC_REG "break" , breakcmd },
9125 { BUILTIN_REGULAR "cd" , cdcmd },
9126 { BUILTIN_NOSPEC "chdir" , cdcmd },
9127 #if ENABLE_ASH_CMDCMD
9128 { BUILTIN_REGULAR "command" , commandcmd },
9130 { BUILTIN_SPEC_REG "continue", breakcmd },
9131 #if ENABLE_ASH_BUILTIN_ECHO
9132 { BUILTIN_REGULAR "echo" , echocmd },
9134 { BUILTIN_SPEC_REG "eval" , evalcmd },
9135 { BUILTIN_SPEC_REG "exec" , execcmd },
9136 { BUILTIN_SPEC_REG "exit" , exitcmd },
9137 { BUILTIN_SPEC_REG_ASSG "export" , exportcmd },
9138 { BUILTIN_REGULAR "false" , falsecmd },
9140 { BUILTIN_REGULAR "fg" , fg_bgcmd },
9142 #if ENABLE_ASH_GETOPTS
9143 { BUILTIN_REGULAR "getopts" , getoptscmd },
9145 { BUILTIN_NOSPEC "hash" , hashcmd },
9147 { BUILTIN_NOSPEC "help" , helpcmd },
9150 { BUILTIN_NOSPEC "history" , historycmd },
9153 { BUILTIN_REGULAR "jobs" , jobscmd },
9154 { BUILTIN_REGULAR "kill" , killcmd },
9156 #if ENABLE_SH_MATH_SUPPORT
9157 { BUILTIN_NOSPEC "let" , letcmd },
9159 { BUILTIN_ASSIGN "local" , localcmd },
9160 #if ENABLE_ASH_BUILTIN_PRINTF
9161 { BUILTIN_REGULAR "printf" , printfcmd },
9163 { BUILTIN_NOSPEC "pwd" , pwdcmd },
9164 { BUILTIN_REGULAR "read" , readcmd },
9165 { BUILTIN_SPEC_REG_ASSG "readonly", exportcmd },
9166 { BUILTIN_SPEC_REG "return" , returncmd },
9167 { BUILTIN_SPEC_REG "set" , setcmd },
9168 { BUILTIN_SPEC_REG "shift" , shiftcmd },
9169 #if ENABLE_ASH_BASH_COMPAT
9170 { BUILTIN_SPEC_REG "source" , dotcmd },
9172 #if ENABLE_ASH_BUILTIN_TEST
9173 { BUILTIN_REGULAR "test" , testcmd },
9175 { BUILTIN_SPEC_REG "times" , timescmd },
9176 { BUILTIN_SPEC_REG "trap" , trapcmd },
9177 { BUILTIN_REGULAR "true" , truecmd },
9178 { BUILTIN_NOSPEC "type" , typecmd },
9179 { BUILTIN_NOSPEC "ulimit" , ulimitcmd },
9180 { BUILTIN_REGULAR "umask" , umaskcmd },
9181 #if ENABLE_ASH_ALIAS
9182 { BUILTIN_REGULAR "unalias" , unaliascmd },
9184 { BUILTIN_SPEC_REG "unset" , unsetcmd },
9185 { BUILTIN_REGULAR "wait" , waitcmd },
9188 /* Should match the above table! */
9189 #define COMMANDCMD (builtintab + \
9191 1 * ENABLE_ASH_BUILTIN_TEST + \
9192 1 * ENABLE_ASH_BUILTIN_TEST * ENABLE_ASH_BASH_COMPAT + \
9193 1 * ENABLE_ASH_ALIAS + \
9194 1 * ENABLE_ASH_JOB_CONTROL + \
9196 #define EXECCMD (builtintab + \
9198 1 * ENABLE_ASH_BUILTIN_TEST + \
9199 1 * ENABLE_ASH_BUILTIN_TEST * ENABLE_ASH_BASH_COMPAT + \
9200 1 * ENABLE_ASH_ALIAS + \
9201 1 * ENABLE_ASH_JOB_CONTROL + \
9203 1 * ENABLE_ASH_CMDCMD + \
9205 ENABLE_ASH_BUILTIN_ECHO + \
9209 * Search the table of builtin commands.
9211 static struct builtincmd *
9212 find_builtin(const char *name)
9214 struct builtincmd *bp;
9217 name, builtintab, ARRAY_SIZE(builtintab), sizeof(builtintab[0]),
9224 * Execute a simple command.
9227 isassignment(const char *p)
9229 const char *q = endofname(p);
9234 static int FAST_FUNC
9235 bltincmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
9237 /* Preserve exitstatus of a previous possible redirection
9238 * as POSIX mandates */
9239 return back_exitstatus;
9242 evalcommand(union node *cmd, int flags)
9244 static const struct builtincmd null_bltin = {
9245 "\0\0", bltincmd /* why three NULs? */
9247 struct stackmark smark;
9249 struct arglist arglist;
9250 struct arglist varlist;
9253 const struct strlist *sp;
9254 struct cmdentry cmdentry;
9261 struct builtincmd *bcmd;
9262 smallint cmd_is_exec;
9263 smallint pseudovarflag = 0;
9265 /* First expand the arguments. */
9266 TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags));
9267 setstackmark(&smark);
9268 back_exitstatus = 0;
9270 cmdentry.cmdtype = CMDBUILTIN;
9271 cmdentry.u.cmd = &null_bltin;
9272 varlist.lastp = &varlist.list;
9273 *varlist.lastp = NULL;
9274 arglist.lastp = &arglist.list;
9275 *arglist.lastp = NULL;
9278 if (cmd->ncmd.args) {
9279 bcmd = find_builtin(cmd->ncmd.args->narg.text);
9280 pseudovarflag = bcmd && IS_BUILTIN_ASSIGN(bcmd);
9283 for (argp = cmd->ncmd.args; argp; argp = argp->narg.next) {
9284 struct strlist **spp;
9286 spp = arglist.lastp;
9287 if (pseudovarflag && isassignment(argp->narg.text))
9288 expandarg(argp, &arglist, EXP_VARTILDE);
9290 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
9292 for (sp = *spp; sp; sp = sp->next)
9296 argv = nargv = stalloc(sizeof(char *) * (argc + 1));
9297 for (sp = arglist.list; sp; sp = sp->next) {
9298 TRACE(("evalcommand arg: %s\n", sp->text));
9299 *nargv++ = sp->text;
9304 if (iflag && funcnest == 0 && argc > 0)
9305 lastarg = nargv[-1];
9308 expredir(cmd->ncmd.redirect);
9309 status = redirectsafe(cmd->ncmd.redirect, REDIR_PUSH | REDIR_SAVEFD2);
9311 path = vpath.var_text;
9312 for (argp = cmd->ncmd.assign; argp; argp = argp->narg.next) {
9313 struct strlist **spp;
9316 spp = varlist.lastp;
9317 expandarg(argp, &varlist, EXP_VARTILDE);
9320 * Modify the command lookup path, if a PATH= assignment
9324 if (varcmp(p, path) == 0)
9328 /* Print the command if xflag is set. */
9331 const char *p = " %s" + 1;
9333 fdprintf(preverrout_fd, p, expandstr(ps4val()));
9335 for (n = 0; n < 2; n++) {
9337 fdprintf(preverrout_fd, p, sp->text);
9343 safe_write(preverrout_fd, "\n", 1);
9349 /* Now locate the command. */
9351 int cmd_flag = DO_ERR;
9352 #if ENABLE_ASH_CMDCMD
9353 const char *oldpath = path + 5;
9357 find_command(argv[0], &cmdentry, cmd_flag, path);
9358 if (cmdentry.cmdtype == CMDUNKNOWN) {
9359 flush_stdout_stderr();
9364 /* implement bltin and command here */
9365 if (cmdentry.cmdtype != CMDBUILTIN)
9368 spclbltin = IS_BUILTIN_SPECIAL(cmdentry.u.cmd);
9369 if (cmdentry.u.cmd == EXECCMD)
9371 #if ENABLE_ASH_CMDCMD
9372 if (cmdentry.u.cmd == COMMANDCMD) {
9374 nargv = parse_command_args(argv, &path);
9377 argc -= nargv - argv;
9379 cmd_flag |= DO_NOFUNC;
9387 /* We have a redirection error. */
9389 raise_exception(EXERROR);
9391 exitstatus = status;
9395 /* Execute the command. */
9396 switch (cmdentry.cmdtype) {
9399 #if ENABLE_FEATURE_SH_NOFORK
9400 /* (1) BUG: if variables are set, we need to fork, or save/restore them
9401 * around run_nofork_applet() call.
9402 * (2) Should this check also be done in forkshell()?
9403 * (perhaps it should, so that "VAR=VAL nofork" at least avoids exec...)
9405 /* find_command() encodes applet_no as (-2 - applet_no) */
9406 int applet_no = (- cmdentry.u.index - 2);
9407 if (applet_no >= 0 && APPLET_IS_NOFORK(applet_no)) {
9408 listsetvar(varlist.list, VEXPORT|VSTACK);
9409 /* run <applet>_main() */
9410 exitstatus = run_nofork_applet(applet_no, argv);
9414 /* Can we avoid forking off? For example, very last command
9415 * in a script or a subshell does not need forking,
9416 * we can just exec it.
9418 if (!(flags & EV_EXIT) || may_have_traps) {
9419 /* No, forking off a child is necessary */
9421 jp = makejob(/*cmd,*/ 1);
9422 if (forkshell(jp, cmd, FORK_FG) != 0) {
9424 exitstatus = waitforjob(jp);
9426 TRACE(("forked child exited with %d\n", exitstatus));
9431 /* fall through to exec'ing external program */
9433 listsetvar(varlist.list, VEXPORT|VSTACK);
9434 shellexec(argv, path, cmdentry.u.index);
9438 cmdenviron = varlist.list;
9440 struct strlist *list = cmdenviron;
9442 if (spclbltin > 0 || argc == 0) {
9444 if (cmd_is_exec && argc > 1)
9447 listsetvar(list, i);
9449 /* Tight loop with builtins only:
9450 * "while kill -0 $child; do true; done"
9451 * will never exit even if $child died, unless we do this
9452 * to reap the zombie and make kill detect that it's gone: */
9453 dowait(DOWAIT_NONBLOCK, NULL);
9455 if (evalbltin(cmdentry.u.cmd, argc, argv)) {
9457 int i = exception_type;
9458 if (i == EXEXIT || i == EXEXEC)
9462 exit_status = 128 + SIGINT;
9464 exit_status = 128 + pending_sig;
9465 exitstatus = exit_status;
9466 if (i == EXINT || spclbltin > 0) {
9468 longjmp(exception_handler->loc, 1);
9475 listsetvar(varlist.list, 0);
9476 /* See above for the rationale */
9477 dowait(DOWAIT_NONBLOCK, NULL);
9478 if (evalfun(cmdentry.u.func, argc, argv, flags))
9484 popredir(/*drop:*/ cmd_is_exec, /*restore:*/ cmd_is_exec);
9486 /* dsl: I think this is intended to be used to support
9487 * '_' in 'vi' command mode during line editing...
9488 * However I implemented that within libedit itself.
9490 setvar0("_", lastarg);
9492 popstackmark(&smark);
9496 evalbltin(const struct builtincmd *cmd, int argc, char **argv)
9498 char *volatile savecmdname;
9499 struct jmploc *volatile savehandler;
9500 struct jmploc jmploc;
9503 savecmdname = commandname;
9504 i = setjmp(jmploc.loc);
9507 savehandler = exception_handler;
9508 exception_handler = &jmploc;
9509 commandname = argv[0];
9511 optptr = NULL; /* initialize nextopt */
9512 exitstatus = (*cmd->builtin)(argc, argv);
9513 flush_stdout_stderr();
9515 exitstatus |= ferror(stdout);
9517 commandname = savecmdname;
9518 exception_handler = savehandler;
9524 goodname(const char *p)
9526 return endofname(p)[0] == '\0';
9531 * Search for a command. This is called before we fork so that the
9532 * location of the command will be available in the parent as well as
9533 * the child. The check for "goodname" is an overly conservative
9534 * check that the name will not be subject to expansion.
9537 prehash(union node *n)
9539 struct cmdentry entry;
9541 if (n->type == NCMD && n->ncmd.args && goodname(n->ncmd.args->narg.text))
9542 find_command(n->ncmd.args->narg.text, &entry, 0, pathval());
9546 /* ============ Builtin commands
9548 * Builtin commands whose functions are closely tied to evaluation
9549 * are implemented here.
9553 * Handle break and continue commands. Break, continue, and return are
9554 * all handled by setting the evalskip flag. The evaluation routines
9555 * above all check this flag, and if it is set they start skipping
9556 * commands rather than executing them. The variable skipcount is
9557 * the number of loops to break/continue, or the number of function
9558 * levels to return. (The latter is always 1.) It should probably
9559 * be an error to break out of more loops than exist, but it isn't
9560 * in the standard shell so we don't make it one here.
9562 static int FAST_FUNC
9563 breakcmd(int argc UNUSED_PARAM, char **argv)
9565 int n = argv[1] ? number(argv[1]) : 1;
9568 ash_msg_and_raise_error(msg_illnum, argv[1]);
9572 evalskip = (**argv == 'c') ? SKIPCONT : SKIPBREAK;
9579 /* ============ input.c
9581 * This implements the input routines used by the parser.
9585 INPUT_PUSH_FILE = 1,
9586 INPUT_NOFILE_OK = 2,
9589 static smallint checkkwd;
9590 /* values of checkkwd variable */
9591 #define CHKALIAS 0x1
9596 * Push a string back onto the input at this current parsefile level.
9597 * We handle aliases this way.
9599 #if !ENABLE_ASH_ALIAS
9600 #define pushstring(s, ap) pushstring(s)
9603 pushstring(char *s, struct alias *ap)
9610 if (g_parsefile->strpush) {
9611 sp = ckzalloc(sizeof(*sp));
9612 sp->prev = g_parsefile->strpush;
9614 sp = &(g_parsefile->basestrpush);
9616 g_parsefile->strpush = sp;
9617 sp->prev_string = g_parsefile->next_to_pgetc;
9618 sp->prev_left_in_line = g_parsefile->left_in_line;
9619 #if ENABLE_ASH_ALIAS
9622 ap->flag |= ALIASINUSE;
9626 g_parsefile->next_to_pgetc = s;
9627 g_parsefile->left_in_line = len;
9634 struct strpush *sp = g_parsefile->strpush;
9637 #if ENABLE_ASH_ALIAS
9639 if (g_parsefile->next_to_pgetc[-1] == ' '
9640 || g_parsefile->next_to_pgetc[-1] == '\t'
9642 checkkwd |= CHKALIAS;
9644 if (sp->string != sp->ap->val) {
9647 sp->ap->flag &= ~ALIASINUSE;
9648 if (sp->ap->flag & ALIASDEAD) {
9649 unalias(sp->ap->name);
9653 g_parsefile->next_to_pgetc = sp->prev_string;
9654 g_parsefile->left_in_line = sp->prev_left_in_line;
9655 g_parsefile->strpush = sp->prev;
9656 if (sp != &(g_parsefile->basestrpush))
9661 //FIXME: BASH_COMPAT with "...&" does TWO pungetc():
9662 //it peeks whether it is &>, and then pushes back both chars.
9663 //This function needs to save last *next_to_pgetc to buf[0]
9664 //to make two pungetc() reliable. Currently,
9665 // pgetc (out of buf: does preadfd), pgetc, pungetc, pungetc won't work...
9670 char *buf = g_parsefile->buf;
9672 g_parsefile->next_to_pgetc = buf;
9673 #if ENABLE_FEATURE_EDITING
9675 if (!iflag || g_parsefile->pf_fd != STDIN_FILENO)
9676 nr = nonblock_immune_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1);
9679 # if ENABLE_ASH_IDLE_TIMEOUT
9681 const char *tmout_var = lookupvar("TMOUT");
9683 timeout = atoi(tmout_var) * 1000;
9689 # if ENABLE_FEATURE_TAB_COMPLETION
9690 line_input_state->path_lookup = pathval();
9692 reinit_unicode_for_ash();
9693 nr = read_line_input(line_input_state, cmdedit_prompt, buf, IBUFSIZ, timeout);
9695 /* Ctrl+C pressed */
9706 /* Ctrl+D pressed */
9709 # if ENABLE_ASH_IDLE_TIMEOUT
9710 else if (errno == EAGAIN && timeout > 0) {
9711 puts("\007timed out waiting for input: auto-logout");
9718 nr = nonblock_immune_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1);
9721 #if 0 /* disabled: nonblock_immune_read() handles this problem */
9723 if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
9724 int flags = fcntl(0, F_GETFL);
9725 if (flags >= 0 && (flags & O_NONBLOCK)) {
9726 flags &= ~O_NONBLOCK;
9727 if (fcntl(0, F_SETFL, flags) >= 0) {
9728 out2str("sh: turning off NDELAY mode\n");
9739 * Refill the input buffer and return the next input character:
9741 * 1) If a string was pushed back on the input, pop it;
9742 * 2) If an EOF was pushed back (g_parsefile->left_in_line < -BIGNUM)
9743 * or we are reading from a string so we can't refill the buffer,
9745 * 3) If there is more stuff in this buffer, use it else call read to fill it.
9746 * 4) Process input up to the next newline, deleting nul characters.
9748 //#define pgetc_debug(...) bb_error_msg(__VA_ARGS__)
9749 #define pgetc_debug(...) ((void)0)
9756 while (g_parsefile->strpush) {
9757 #if ENABLE_ASH_ALIAS
9758 if (g_parsefile->left_in_line == -1
9759 && g_parsefile->strpush->ap
9760 && g_parsefile->next_to_pgetc[-1] != ' '
9761 && g_parsefile->next_to_pgetc[-1] != '\t'
9763 pgetc_debug("preadbuffer PEOA");
9768 /* try "pgetc" now: */
9769 pgetc_debug("preadbuffer internal pgetc at %d:%p'%s'",
9770 g_parsefile->left_in_line,
9771 g_parsefile->next_to_pgetc,
9772 g_parsefile->next_to_pgetc);
9773 if (--g_parsefile->left_in_line >= 0)
9774 return (unsigned char)(*g_parsefile->next_to_pgetc++);
9776 /* on both branches above g_parsefile->left_in_line < 0.
9777 * "pgetc" needs refilling.
9780 /* -90 is our -BIGNUM. Below we use -99 to mark "EOF on read",
9781 * pungetc() may increment it a few times.
9782 * Assuming it won't increment it to less than -90.
9784 if (g_parsefile->left_in_line < -90 || g_parsefile->buf == NULL) {
9785 pgetc_debug("preadbuffer PEOF1");
9786 /* even in failure keep left_in_line and next_to_pgetc
9787 * in lock step, for correct multi-layer pungetc.
9788 * left_in_line was decremented before preadbuffer(),
9789 * must inc next_to_pgetc: */
9790 g_parsefile->next_to_pgetc++;
9794 more = g_parsefile->left_in_buffer;
9796 flush_stdout_stderr();
9800 /* don't try reading again */
9801 g_parsefile->left_in_line = -99;
9802 pgetc_debug("preadbuffer PEOF2");
9803 g_parsefile->next_to_pgetc++;
9808 /* Find out where's the end of line.
9809 * Set g_parsefile->left_in_line
9810 * and g_parsefile->left_in_buffer acordingly.
9811 * NUL chars are deleted.
9813 q = g_parsefile->next_to_pgetc;
9821 memmove(q, q + 1, more);
9825 g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1;
9831 g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1;
9832 if (g_parsefile->left_in_line < 0)
9837 g_parsefile->left_in_buffer = more;
9842 out2str(g_parsefile->next_to_pgetc);
9846 pgetc_debug("preadbuffer at %d:%p'%s'",
9847 g_parsefile->left_in_line,
9848 g_parsefile->next_to_pgetc,
9849 g_parsefile->next_to_pgetc);
9850 return (unsigned char)*g_parsefile->next_to_pgetc++;
9853 #define pgetc_as_macro() \
9854 (--g_parsefile->left_in_line >= 0 \
9855 ? (unsigned char)*g_parsefile->next_to_pgetc++ \
9862 pgetc_debug("pgetc_fast at %d:%p'%s'",
9863 g_parsefile->left_in_line,
9864 g_parsefile->next_to_pgetc,
9865 g_parsefile->next_to_pgetc);
9866 return pgetc_as_macro();
9869 #if ENABLE_ASH_OPTIMIZE_FOR_SIZE
9870 # define pgetc_fast() pgetc()
9872 # define pgetc_fast() pgetc_as_macro()
9875 #if ENABLE_ASH_ALIAS
9877 pgetc_without_PEOA(void)
9881 pgetc_debug("pgetc_fast at %d:%p'%s'",
9882 g_parsefile->left_in_line,
9883 g_parsefile->next_to_pgetc,
9884 g_parsefile->next_to_pgetc);
9886 } while (c == PEOA);
9890 # define pgetc_without_PEOA() pgetc()
9894 * Read a line from the script.
9897 pfgets(char *line, int len)
9903 while (--nleft > 0) {
9904 c = pgetc_without_PEOA();
9919 * Undo the last call to pgetc. Only one character may be pushed back.
9920 * PEOF may be pushed back.
9925 g_parsefile->left_in_line++;
9926 g_parsefile->next_to_pgetc--;
9927 pgetc_debug("pushed back to %d:%p'%s'",
9928 g_parsefile->left_in_line,
9929 g_parsefile->next_to_pgetc,
9930 g_parsefile->next_to_pgetc);
9934 * To handle the "." command, a stack of input files is used. Pushfile
9935 * adds a new entry to the stack and popfile restores the previous level.
9940 struct parsefile *pf;
9942 pf = ckzalloc(sizeof(*pf));
9943 pf->prev = g_parsefile;
9945 /*pf->strpush = NULL; - ckzalloc did it */
9946 /*pf->basestrpush.prev = NULL;*/
9953 struct parsefile *pf = g_parsefile;
9961 g_parsefile = pf->prev;
9967 * Return to top level.
9972 while (g_parsefile != &basepf)
9977 * Close the file(s) that the shell is reading commands from. Called
9978 * after a fork is done.
9984 if (g_parsefile->pf_fd > 0) {
9985 close(g_parsefile->pf_fd);
9986 g_parsefile->pf_fd = 0;
9991 * Like setinputfile, but takes an open file descriptor. Call this with
9995 setinputfd(int fd, int push)
9997 close_on_exec_on(fd);
10000 g_parsefile->buf = NULL;
10002 g_parsefile->pf_fd = fd;
10003 if (g_parsefile->buf == NULL)
10004 g_parsefile->buf = ckmalloc(IBUFSIZ);
10005 g_parsefile->left_in_buffer = 0;
10006 g_parsefile->left_in_line = 0;
10007 g_parsefile->linno = 1;
10011 * Set the input to take input from a file. If push is set, push the
10012 * old input onto the stack first.
10015 setinputfile(const char *fname, int flags)
10021 fd = open(fname, O_RDONLY);
10023 if (flags & INPUT_NOFILE_OK)
10025 ash_msg_and_raise_error("can't open '%s'", fname);
10028 fd2 = copyfd(fd, 10);
10031 ash_msg_and_raise_error("out of file descriptors");
10034 setinputfd(fd, flags & INPUT_PUSH_FILE);
10041 * Like setinputfile, but takes input from a string.
10044 setinputstring(char *string)
10048 g_parsefile->next_to_pgetc = string;
10049 g_parsefile->left_in_line = strlen(string);
10050 g_parsefile->buf = NULL;
10051 g_parsefile->linno = 1;
10056 /* ============ mail.c
10058 * Routines to check for mail.
10061 #if ENABLE_ASH_MAIL
10063 /* Hash of mtimes of mailboxes */
10064 static unsigned mailtime_hash;
10065 /* Set if MAIL or MAILPATH is changed. */
10066 static smallint mail_var_path_changed;
10069 * Print appropriate message(s) if mail has arrived.
10070 * If mail_var_path_changed is set,
10071 * then the value of MAIL has mail_var_path_changed,
10072 * so we just update the values.
10081 struct stackmark smark;
10084 setstackmark(&smark);
10085 mpath = mpathset() ? mpathval() : mailval();
10088 p = path_advance(&mpath, nullstr);
10093 for (q = p; *q; q++)
10099 q[-1] = '\0'; /* delete trailing '/' */
10100 if (stat(p, &statb) < 0) {
10103 /* Very simplistic "hash": just a sum of all mtimes */
10104 new_hash += (unsigned)statb.st_mtime;
10106 if (!mail_var_path_changed && mailtime_hash != new_hash) {
10107 if (mailtime_hash != 0)
10108 out2str("you have mail\n");
10109 mailtime_hash = new_hash;
10111 mail_var_path_changed = 0;
10112 popstackmark(&smark);
10115 static void FAST_FUNC
10116 changemail(const char *val UNUSED_PARAM)
10118 mail_var_path_changed = 1;
10121 #endif /* ASH_MAIL */
10124 /* ============ ??? */
10127 * Set the shell parameters.
10130 setparam(char **argv)
10136 for (nparam = 0; argv[nparam]; nparam++)
10138 ap = newparam = ckmalloc((nparam + 1) * sizeof(*ap));
10140 *ap++ = ckstrdup(*argv++);
10143 freeparam(&shellparam);
10144 shellparam.malloced = 1;
10145 shellparam.nparam = nparam;
10146 shellparam.p = newparam;
10147 #if ENABLE_ASH_GETOPTS
10148 shellparam.optind = 1;
10149 shellparam.optoff = -1;
10154 * Process shell options. The global variable argptr contains a pointer
10155 * to the argument list; we advance it past the options.
10157 * SUSv3 section 2.8.1 "Consequences of Shell Errors" says:
10158 * For a non-interactive shell, an error condition encountered
10159 * by a special built-in ... shall cause the shell to write a diagnostic message
10160 * to standard error and exit as shown in the following table:
10161 * Error Special Built-In
10163 * Utility syntax error (option or operand error) Shall exit
10165 * However, in bug 1142 (http://busybox.net/bugs/view.php?id=1142)
10166 * we see that bash does not do that (set "finishes" with error code 1 instead,
10167 * and shell continues), and people rely on this behavior!
10169 * set -o barfoo 2>/dev/null
10172 * Oh well. Let's mimic that.
10175 plus_minus_o(char *name, int val)
10180 for (i = 0; i < NOPTS; i++) {
10181 if (strcmp(name, optnames(i)) == 0) {
10186 ash_msg("illegal option %co %s", val ? '-' : '+', name);
10189 for (i = 0; i < NOPTS; i++) {
10191 out1fmt("%-16s%s\n", optnames(i), optlist[i] ? "on" : "off");
10193 out1fmt("set %co %s\n", optlist[i] ? '-' : '+', optnames(i));
10199 setoption(int flag, int val)
10203 for (i = 0; i < NOPTS; i++) {
10204 if (optletters(i) == flag) {
10209 ash_msg_and_raise_error("illegal option %c%c", val ? '-' : '+', flag);
10213 options(int cmdline)
10221 while ((p = *argptr) != NULL) {
10223 if (c != '-' && c != '+')
10226 val = 0; /* val = 0 if c == '+' */
10229 if (p[0] == '\0' || LONE_DASH(p)) {
10231 /* "-" means turn off -x and -v */
10234 /* "--" means reset params */
10235 else if (*argptr == NULL)
10238 break; /* "-" or "--" terminates options */
10241 /* first char was + or - */
10242 while ((c = *p++) != '\0') {
10243 /* bash 3.2 indeed handles -c CMD and +c CMD the same */
10244 if (c == 'c' && cmdline) {
10245 minusc = p; /* command is after shell args */
10246 } else if (c == 'o') {
10247 if (plus_minus_o(*argptr, val)) {
10248 /* it already printed err message */
10249 return 1; /* error */
10253 } else if (cmdline && (c == 'l')) { /* -l or +l == --login */
10255 /* bash does not accept +-login, we also won't */
10256 } else if (cmdline && val && (c == '-')) { /* long options */
10257 if (strcmp(p, "login") == 0)
10269 * The shift builtin command.
10271 static int FAST_FUNC
10272 shiftcmd(int argc UNUSED_PARAM, char **argv)
10279 n = number(argv[1]);
10280 if (n > shellparam.nparam)
10281 n = 0; /* bash compat, was = shellparam.nparam; */
10283 shellparam.nparam -= n;
10284 for (ap1 = shellparam.p; --n >= 0; ap1++) {
10285 if (shellparam.malloced)
10288 ap2 = shellparam.p;
10289 while ((*ap2++ = *ap1++) != NULL)
10291 #if ENABLE_ASH_GETOPTS
10292 shellparam.optind = 1;
10293 shellparam.optoff = -1;
10300 * POSIX requires that 'set' (but not export or readonly) output the
10301 * variables in lexicographic order - by the locale's collating order (sigh).
10302 * Maybe we could keep them in an ordered balanced binary tree
10303 * instead of hashed lists.
10304 * For now just roll 'em through qsort for printing...
10307 showvars(const char *sep_prefix, int on, int off)
10310 char **ep, **epend;
10312 ep = listvars(on, off, &epend);
10313 qsort(ep, epend - ep, sizeof(char *), vpcmp);
10315 sep = *sep_prefix ? " " : sep_prefix;
10317 for (; ep < epend; ep++) {
10321 p = strchrnul(*ep, '=');
10324 q = single_quote(++p);
10325 out1fmt("%s%s%.*s%s\n", sep_prefix, sep, (int)(p - *ep), *ep, q);
10331 * The set command builtin.
10333 static int FAST_FUNC
10334 setcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
10339 return showvars(nullstr, 0, VUNSET);
10342 retval = options(/*cmdline:*/ 0);
10343 if (retval == 0) { /* if no parse error... */
10345 if (*argptr != NULL) {
10353 #if ENABLE_ASH_RANDOM_SUPPORT
10354 static void FAST_FUNC
10355 change_random(const char *value)
10359 if (value == NULL) {
10360 /* "get", generate */
10361 t = next_random(&random_gen);
10362 /* set without recursion */
10363 setvar(vrandom.var_text, utoa(t), VNOFUNC);
10364 vrandom.flags &= ~VNOFUNC;
10367 t = strtoul(value, NULL, 10);
10368 INIT_RANDOM_T(&random_gen, (t ? t : 1), t);
10373 #if ENABLE_ASH_GETOPTS
10375 getopts(char *optstr, char *optvar, char **optfirst, int *param_optind, int *optoff)
10386 if (*param_optind < 1)
10388 optnext = optfirst + *param_optind - 1;
10390 if (*param_optind <= 1 || *optoff < 0 || (int)strlen(optnext[-1]) < *optoff)
10393 p = optnext[-1] + *optoff;
10394 if (p == NULL || *p == '\0') {
10395 /* Current word is done, advance */
10397 if (p == NULL || *p != '-' || *++p == '\0') {
10404 if (LONE_DASH(p)) /* check for "--" */
10409 for (q = optstr; *q != c;) {
10411 if (optstr[0] == ':') {
10413 /*sbuf[1] = '\0'; - already is */
10414 err |= setvarsafe("OPTARG", sbuf, 0);
10416 fprintf(stderr, "Illegal option -%c\n", c);
10417 unsetvar("OPTARG");
10427 if (*p == '\0' && (p = *optnext) == NULL) {
10428 if (optstr[0] == ':') {
10430 /*sbuf[1] = '\0'; - already is */
10431 err |= setvarsafe("OPTARG", sbuf, 0);
10434 fprintf(stderr, "No arg for -%c option\n", c);
10435 unsetvar("OPTARG");
10443 err |= setvarsafe("OPTARG", p, 0);
10446 err |= setvarsafe("OPTARG", nullstr, 0);
10448 *optoff = p ? p - *(optnext - 1) : -1;
10449 *param_optind = optnext - optfirst + 1;
10450 err |= setvarsafe("OPTIND", itoa(*param_optind), VNOFUNC);
10452 /*sbuf[1] = '\0'; - already is */
10453 err |= setvarsafe(optvar, sbuf, 0);
10457 flush_stdout_stderr();
10458 raise_exception(EXERROR);
10464 * The getopts builtin. Shellparam.optnext points to the next argument
10465 * to be processed. Shellparam.optptr points to the next character to
10466 * be processed in the current argument. If shellparam.optnext is NULL,
10467 * then it's the first time getopts has been called.
10469 static int FAST_FUNC
10470 getoptscmd(int argc, char **argv)
10475 ash_msg_and_raise_error("usage: getopts optstring var [arg]");
10477 optbase = shellparam.p;
10478 if (shellparam.optind > shellparam.nparam + 1) {
10479 shellparam.optind = 1;
10480 shellparam.optoff = -1;
10483 optbase = &argv[3];
10484 if (shellparam.optind > argc - 2) {
10485 shellparam.optind = 1;
10486 shellparam.optoff = -1;
10490 return getopts(argv[1], argv[2], optbase, &shellparam.optind,
10491 &shellparam.optoff);
10493 #endif /* ASH_GETOPTS */
10496 /* ============ Shell parser */
10499 struct heredoc *next; /* next here document in list */
10500 union node *here; /* redirection node */
10501 char *eofmark; /* string indicating end of input */
10502 smallint striptabs; /* if set, strip leading tabs */
10505 static smallint tokpushback; /* last token pushed back */
10506 static smallint quoteflag; /* set if (part of) last token was quoted */
10507 static token_id_t lasttoken; /* last token read (integer id Txxx) */
10508 static struct heredoc *heredoclist; /* list of here documents to read */
10509 static char *wordtext; /* text of last word returned by readtoken */
10510 static struct nodelist *backquotelist;
10511 static union node *redirnode;
10512 static struct heredoc *heredoc;
10514 static const char *
10515 tokname(char *buf, int tok)
10518 return tokname_array[tok] + 1;
10519 sprintf(buf, "\"%s\"", tokname_array[tok] + 1);
10523 /* raise_error_unexpected_syntax:
10524 * Called when an unexpected token is read during the parse. The argument
10525 * is the token that is expected, or -1 if more than one type of token can
10526 * occur at this point.
10528 static void raise_error_unexpected_syntax(int) NORETURN;
10530 raise_error_unexpected_syntax(int token)
10536 l = sprintf(msg, "unexpected %s", tokname(buf, lasttoken));
10538 sprintf(msg + l, " (expecting %s)", tokname(buf, token));
10539 raise_error_syntax(msg);
10543 #define EOFMARKLEN 79
10545 /* parsing is heavily cross-recursive, need these forward decls */
10546 static union node *andor(void);
10547 static union node *pipeline(void);
10548 static union node *parse_command(void);
10549 static void parseheredoc(void);
10550 static int peektoken(void);
10551 static int readtoken(void);
10553 static union node *
10556 union node *n1, *n2, *n3;
10561 switch (peektoken()) {
10569 if (!n1 && (nlflag & 1))
10575 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10576 if (nlflag == 2 && tokname_array[peektoken()][0])
10582 if (tok == TBACKGND) {
10583 if (n2->type == NPIPE) {
10584 n2->npipe.pipe_backgnd = 1;
10586 if (n2->type != NREDIR) {
10587 n3 = stzalloc(sizeof(struct nredir));
10589 /*n3->nredir.redirect = NULL; - stzalloc did it */
10592 n2->type = NBACKGND;
10598 n3 = stzalloc(sizeof(struct nbinary));
10600 n3->nbinary.ch1 = n1;
10601 n3->nbinary.ch2 = n2;
10614 raise_error_unexpected_syntax(-1);
10621 static union node *
10624 union node *n1, *n2, *n3;
10632 } else if (t == TOR) {
10638 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10640 n3 = stzalloc(sizeof(struct nbinary));
10642 n3->nbinary.ch1 = n1;
10643 n3->nbinary.ch2 = n2;
10648 static union node *
10651 union node *n1, *n2, *pipenode;
10652 struct nodelist *lp, *prev;
10656 TRACE(("pipeline: entered\n"));
10657 if (readtoken() == TNOT) {
10659 checkkwd = CHKKWD | CHKALIAS;
10662 n1 = parse_command();
10663 if (readtoken() == TPIPE) {
10664 pipenode = stzalloc(sizeof(struct npipe));
10665 pipenode->type = NPIPE;
10666 /*pipenode->npipe.pipe_backgnd = 0; - stzalloc did it */
10667 lp = stzalloc(sizeof(struct nodelist));
10668 pipenode->npipe.cmdlist = lp;
10672 lp = stzalloc(sizeof(struct nodelist));
10673 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10674 lp->n = parse_command();
10676 } while (readtoken() == TPIPE);
10682 n2 = stzalloc(sizeof(struct nnot));
10690 static union node *
10695 n = stzalloc(sizeof(struct narg));
10697 /*n->narg.next = NULL; - stzalloc did it */
10698 n->narg.text = wordtext;
10699 n->narg.backquote = backquotelist;
10704 fixredir(union node *n, const char *text, int err)
10708 TRACE(("Fix redir %s %d\n", text, err));
10710 n->ndup.vname = NULL;
10712 fd = bb_strtou(text, NULL, 10);
10713 if (!errno && fd >= 0)
10714 n->ndup.dupfd = fd;
10715 else if (LONE_DASH(text))
10716 n->ndup.dupfd = -1;
10719 raise_error_syntax("bad fd number");
10720 n->ndup.vname = makename();
10725 * Returns true if the text contains nothing to expand (no dollar signs
10729 noexpand(const char *text)
10733 while ((c = *text++) != '\0') {
10734 if (c == CTLQUOTEMARK)
10738 else if (SIT(c, BASESYNTAX) == CCTL)
10747 union node *n = redirnode;
10749 if (readtoken() != TWORD)
10750 raise_error_unexpected_syntax(-1);
10751 if (n->type == NHERE) {
10752 struct heredoc *here = heredoc;
10756 if (quoteflag == 0)
10758 TRACE(("Here document %d\n", n->type));
10759 if (!noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN)
10760 raise_error_syntax("illegal eof marker for << redirection");
10761 rmescapes(wordtext, 0);
10762 here->eofmark = wordtext;
10764 if (heredoclist == NULL)
10765 heredoclist = here;
10767 for (p = heredoclist; p->next; p = p->next)
10771 } else if (n->type == NTOFD || n->type == NFROMFD) {
10772 fixredir(n, wordtext, 0);
10774 n->nfile.fname = makename();
10778 static union node *
10781 union node *args, **app;
10782 union node *n = NULL;
10783 union node *vars, **vpp;
10784 union node **rpp, *redir;
10786 #if ENABLE_ASH_BASH_COMPAT
10787 smallint double_brackets_flag = 0;
10788 smallint function_flag = 0;
10798 savecheckkwd = CHKALIAS;
10801 checkkwd = savecheckkwd;
10804 #if ENABLE_ASH_BASH_COMPAT
10806 if (peektoken() != TWORD)
10807 raise_error_unexpected_syntax(TWORD);
10810 case TAND: /* "&&" */
10811 case TOR: /* "||" */
10812 if (!double_brackets_flag) {
10816 wordtext = (char *) (t == TAND ? "-a" : "-o");
10819 n = stzalloc(sizeof(struct narg));
10821 /*n->narg.next = NULL; - stzalloc did it */
10822 n->narg.text = wordtext;
10823 #if ENABLE_ASH_BASH_COMPAT
10824 if (strcmp("[[", wordtext) == 0)
10825 double_brackets_flag = 1;
10826 else if (strcmp("]]", wordtext) == 0)
10827 double_brackets_flag = 0;
10829 n->narg.backquote = backquotelist;
10830 if (savecheckkwd && isassignment(wordtext)) {
10832 vpp = &n->narg.next;
10835 app = &n->narg.next;
10838 #if ENABLE_ASH_BASH_COMPAT
10839 if (function_flag) {
10840 checkkwd = CHKNL | CHKKWD;
10841 switch (peektoken()) {
10853 if (strcmp("[[", wordtext) == 0)
10857 raise_error_unexpected_syntax(-1);
10863 *rpp = n = redirnode;
10864 rpp = &n->nfile.next;
10865 parsefname(); /* read name of redirection file */
10868 IF_ASH_BASH_COMPAT(do_func:)
10869 if (args && app == &args->narg.next
10872 struct builtincmd *bcmd;
10875 /* We have a function */
10876 if (IF_ASH_BASH_COMPAT(!function_flag &&) readtoken() != TRP)
10877 raise_error_unexpected_syntax(TRP);
10878 name = n->narg.text;
10879 if (!goodname(name)
10880 || ((bcmd = find_builtin(name)) && IS_BUILTIN_SPECIAL(bcmd))
10882 raise_error_syntax("bad function name");
10885 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10886 n->narg.next = parse_command();
10889 IF_ASH_BASH_COMPAT(function_flag = 0;)
10900 n = stzalloc(sizeof(struct ncmd));
10902 n->ncmd.args = args;
10903 n->ncmd.assign = vars;
10904 n->ncmd.redirect = redir;
10908 static union node *
10909 parse_command(void)
10911 union node *n1, *n2;
10912 union node *ap, **app;
10913 union node *cp, **cpp;
10914 union node *redir, **rpp;
10921 switch (readtoken()) {
10923 raise_error_unexpected_syntax(-1);
10926 n1 = stzalloc(sizeof(struct nif));
10928 n1->nif.test = list(0);
10929 if (readtoken() != TTHEN)
10930 raise_error_unexpected_syntax(TTHEN);
10931 n1->nif.ifpart = list(0);
10933 while (readtoken() == TELIF) {
10934 n2->nif.elsepart = stzalloc(sizeof(struct nif));
10935 n2 = n2->nif.elsepart;
10937 n2->nif.test = list(0);
10938 if (readtoken() != TTHEN)
10939 raise_error_unexpected_syntax(TTHEN);
10940 n2->nif.ifpart = list(0);
10942 if (lasttoken == TELSE)
10943 n2->nif.elsepart = list(0);
10945 n2->nif.elsepart = NULL;
10953 n1 = stzalloc(sizeof(struct nbinary));
10954 n1->type = (lasttoken == TWHILE) ? NWHILE : NUNTIL;
10955 n1->nbinary.ch1 = list(0);
10958 TRACE(("expecting DO got '%s' %s\n", tokname_array[got] + 1,
10959 got == TWORD ? wordtext : ""));
10960 raise_error_unexpected_syntax(TDO);
10962 n1->nbinary.ch2 = list(0);
10967 if (readtoken() != TWORD || quoteflag || !goodname(wordtext))
10968 raise_error_syntax("bad for loop variable");
10969 n1 = stzalloc(sizeof(struct nfor));
10971 n1->nfor.var = wordtext;
10972 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10973 if (readtoken() == TIN) {
10975 while (readtoken() == TWORD) {
10976 n2 = stzalloc(sizeof(struct narg));
10978 /*n2->narg.next = NULL; - stzalloc did it */
10979 n2->narg.text = wordtext;
10980 n2->narg.backquote = backquotelist;
10982 app = &n2->narg.next;
10985 n1->nfor.args = ap;
10986 if (lasttoken != TNL && lasttoken != TSEMI)
10987 raise_error_unexpected_syntax(-1);
10989 n2 = stzalloc(sizeof(struct narg));
10991 /*n2->narg.next = NULL; - stzalloc did it */
10992 n2->narg.text = (char *)dolatstr;
10993 /*n2->narg.backquote = NULL;*/
10994 n1->nfor.args = n2;
10996 * Newline or semicolon here is optional (but note
10997 * that the original Bourne shell only allowed NL).
10999 if (lasttoken != TSEMI)
11002 checkkwd = CHKNL | CHKKWD | CHKALIAS;
11003 if (readtoken() != TDO)
11004 raise_error_unexpected_syntax(TDO);
11005 n1->nfor.body = list(0);
11009 n1 = stzalloc(sizeof(struct ncase));
11011 if (readtoken() != TWORD)
11012 raise_error_unexpected_syntax(TWORD);
11013 n1->ncase.expr = n2 = stzalloc(sizeof(struct narg));
11015 /*n2->narg.next = NULL; - stzalloc did it */
11016 n2->narg.text = wordtext;
11017 n2->narg.backquote = backquotelist;
11018 checkkwd = CHKNL | CHKKWD | CHKALIAS;
11019 if (readtoken() != TIN)
11020 raise_error_unexpected_syntax(TIN);
11021 cpp = &n1->ncase.cases;
11023 checkkwd = CHKNL | CHKKWD;
11025 while (t != TESAC) {
11026 if (lasttoken == TLP)
11028 *cpp = cp = stzalloc(sizeof(struct nclist));
11030 app = &cp->nclist.pattern;
11032 *app = ap = stzalloc(sizeof(struct narg));
11034 /*ap->narg.next = NULL; - stzalloc did it */
11035 ap->narg.text = wordtext;
11036 ap->narg.backquote = backquotelist;
11037 if (readtoken() != TPIPE)
11039 app = &ap->narg.next;
11042 //ap->narg.next = NULL;
11043 if (lasttoken != TRP)
11044 raise_error_unexpected_syntax(TRP);
11045 cp->nclist.body = list(2);
11047 cpp = &cp->nclist.next;
11049 checkkwd = CHKNL | CHKKWD;
11053 raise_error_unexpected_syntax(TENDCASE);
11060 n1 = stzalloc(sizeof(struct nredir));
11061 n1->type = NSUBSHELL;
11062 n1->nredir.n = list(0);
11063 /*n1->nredir.redirect = NULL; - stzalloc did it */
11070 IF_ASH_BASH_COMPAT(case TFUNCTION:)
11074 return simplecmd();
11077 if (readtoken() != t)
11078 raise_error_unexpected_syntax(t);
11081 /* Now check for redirection which may follow command */
11082 checkkwd = CHKKWD | CHKALIAS;
11084 while (readtoken() == TREDIR) {
11085 *rpp = n2 = redirnode;
11086 rpp = &n2->nfile.next;
11092 if (n1->type != NSUBSHELL) {
11093 n2 = stzalloc(sizeof(struct nredir));
11098 n1->nredir.redirect = redir;
11103 #if ENABLE_ASH_BASH_COMPAT
11104 static int decode_dollar_squote(void)
11106 static const char C_escapes[] ALIGN1 = "nrbtfav""x\\01234567";
11112 p = strchr(C_escapes, c);
11117 if ((unsigned char)(c - '0') <= 7) { /* \ooo */
11121 } while ((unsigned char)(c - '0') <= 7 && --cnt);
11123 } else if (c == 'x') { /* \xHH */
11127 } while (isxdigit(c) && --cnt);
11129 if (cnt == 3) { /* \x but next char is "bad" */
11133 } else { /* simple seq like \\ or \t */
11138 c = bb_process_escape_sequence((void*)&p);
11139 } else { /* unrecognized "\z": print both chars unless ' or " */
11140 if (c != '\'' && c != '"') {
11142 c |= 0x100; /* "please encode \, then me" */
11150 * If eofmark is NULL, read a word or a redirection symbol. If eofmark
11151 * is not NULL, read a here document. In the latter case, eofmark is the
11152 * word which marks the end of the document and striptabs is true if
11153 * leading tabs should be stripped from the document. The argument c
11154 * is the first character of the input token or document.
11156 * Because C does not have internal subroutines, I have simulated them
11157 * using goto's to implement the subroutine linkage. The following macros
11158 * will run code that appears at the end of readtoken1.
11160 #define CHECKEND() {goto checkend; checkend_return:;}
11161 #define PARSEREDIR() {goto parseredir; parseredir_return:;}
11162 #define PARSESUB() {goto parsesub; parsesub_return:;}
11163 #define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;}
11164 #define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;}
11165 #define PARSEARITH() {goto parsearith; parsearith_return:;}
11167 readtoken1(int c, int syntax, char *eofmark, int striptabs)
11169 /* NB: syntax parameter fits into smallint */
11170 /* c parameter is an unsigned char or PEOF or PEOA */
11173 char line[EOFMARKLEN + 1];
11174 struct nodelist *bqlist;
11178 smallint prevsyntax; /* syntax before arithmetic */
11179 #if ENABLE_ASH_EXPAND_PRMT
11180 smallint pssyntax; /* we are expanding a prompt string */
11182 int varnest; /* levels of variables expansion */
11183 int arinest; /* levels of arithmetic expansion */
11184 int parenlevel; /* levels of parens in arithmetic */
11185 int dqvarnest; /* levels of variables expansion within double quotes */
11187 IF_ASH_BASH_COMPAT(smallint bash_dollar_squote = 0;)
11189 startlinno = g_parsefile->linno;
11193 #if ENABLE_ASH_EXPAND_PRMT
11194 pssyntax = (syntax == PSSYNTAX);
11198 dblquote = (syntax == DQSYNTAX);
11204 STARTSTACKSTR(out);
11206 /* For each line, until end of word */
11207 CHECKEND(); /* set c to PEOF if at end of here document */
11208 for (;;) { /* until end of line or end of word */
11209 CHECKSTRSPACE(4, out); /* permit 4 calls to USTPUTC */
11210 switch (SIT(c, syntax)) {
11211 case CNL: /* '\n' */
11212 if (syntax == BASESYNTAX)
11213 goto endword; /* exit outer loop */
11215 g_parsefile->linno++;
11216 setprompt_if(doprompt, 2);
11218 goto loop; /* continue outer loop */
11223 if (eofmark == NULL || dblquote)
11224 USTPUTC(CTLESC, out);
11225 #if ENABLE_ASH_BASH_COMPAT
11226 if (c == '\\' && bash_dollar_squote) {
11227 c = decode_dollar_squote();
11229 USTPUTC('\\', out);
11230 c = (unsigned char)c;
11236 case CBACK: /* backslash */
11237 c = pgetc_without_PEOA();
11239 USTPUTC(CTLESC, out);
11240 USTPUTC('\\', out);
11242 } else if (c == '\n') {
11243 setprompt_if(doprompt, 2);
11245 #if ENABLE_ASH_EXPAND_PRMT
11246 if (c == '$' && pssyntax) {
11247 USTPUTC(CTLESC, out);
11248 USTPUTC('\\', out);
11251 /* Backslash is retained if we are in "str" and next char isn't special */
11256 && (c != '"' || eofmark != NULL)
11258 USTPUTC('\\', out);
11260 USTPUTC(CTLESC, out);
11268 if (eofmark == NULL) {
11269 USTPUTC(CTLQUOTEMARK, out);
11277 IF_ASH_BASH_COMPAT(bash_dollar_squote = 0;)
11278 if (eofmark != NULL && varnest == 0) {
11281 if (dqvarnest == 0) {
11282 syntax = BASESYNTAX;
11289 case CVAR: /* '$' */
11290 PARSESUB(); /* parse substitution */
11292 case CENDVAR: /* '}' */
11295 if (dqvarnest > 0) {
11302 #if ENABLE_SH_MATH_SUPPORT
11303 case CLP: /* '(' in arithmetic */
11307 case CRP: /* ')' in arithmetic */
11308 if (parenlevel > 0) {
11311 if (pgetc() == ')') {
11313 if (--arinest == 0) {
11314 syntax = prevsyntax;
11318 * unbalanced parens
11319 * (don't 2nd guess - no error)
11327 case CBQUOTE: /* '`' */
11331 goto endword; /* exit outer loop */
11335 if (varnest == 0) {
11336 #if ENABLE_ASH_BASH_COMPAT
11338 if (pgetc() == '>')
11339 c = 0x100 + '>'; /* flag &> */
11343 goto endword; /* exit outer loop */
11345 IF_ASH_ALIAS(if (c != PEOA))
11352 #if ENABLE_SH_MATH_SUPPORT
11353 if (syntax == ARISYNTAX)
11354 raise_error_syntax("missing '))'");
11356 if (syntax != BASESYNTAX && eofmark == NULL)
11357 raise_error_syntax("unterminated quoted string");
11358 if (varnest != 0) {
11359 startlinno = g_parsefile->linno;
11361 raise_error_syntax("missing '}'");
11363 USTPUTC('\0', out);
11364 len = out - (char *)stackblock();
11365 out = stackblock();
11366 if (eofmark == NULL) {
11367 if ((c == '>' || c == '<' IF_ASH_BASH_COMPAT( || c == 0x100 + '>'))
11370 if (isdigit_str9(out)) {
11371 PARSEREDIR(); /* passed as params: out, c */
11372 lasttoken = TREDIR;
11375 /* else: non-number X seen, interpret it
11376 * as "NNNX>file" = "NNNX >file" */
11380 quoteflag = quotef;
11381 backquotelist = bqlist;
11382 grabstackblock(len);
11386 /* end of readtoken routine */
11389 * Check to see whether we are at the end of the here document. When this
11390 * is called, c is set to the first character of the next input line. If
11391 * we are at the end of the here document, this routine sets the c to PEOF.
11395 #if ENABLE_ASH_ALIAS
11397 c = pgetc_without_PEOA();
11400 while (c == '\t') {
11401 c = pgetc_without_PEOA();
11404 if (c == *eofmark) {
11405 if (pfgets(line, sizeof(line)) != NULL) {
11409 for (q = eofmark + 1; *q && *p == *q; p++, q++)
11411 if (*p == '\n' && *q == '\0') {
11413 g_parsefile->linno++;
11414 needprompt = doprompt;
11416 pushstring(line, NULL);
11421 goto checkend_return;
11425 * Parse a redirection operator. The variable "out" points to a string
11426 * specifying the fd to be redirected. The variable "c" contains the
11427 * first character of the redirection operator.
11430 /* out is already checked to be a valid number or "" */
11431 int fd = (*out == '\0' ? -1 : atoi(out));
11434 np = stzalloc(sizeof(struct nfile));
11439 np->type = NAPPEND;
11441 np->type = NCLOBBER;
11444 /* it also can be NTO2 (>&file), but we can't figure it out yet */
11450 #if ENABLE_ASH_BASH_COMPAT
11451 else if (c == 0x100 + '>') { /* this flags &> redirection */
11453 pgetc(); /* this is '>', no need to check */
11457 else { /* c == '<' */
11458 /*np->nfile.fd = 0; - stzalloc did it */
11462 if (sizeof(struct nfile) != sizeof(struct nhere)) {
11463 np = stzalloc(sizeof(struct nhere));
11464 /*np->nfile.fd = 0; - stzalloc did it */
11467 heredoc = stzalloc(sizeof(struct heredoc));
11468 heredoc->here = np;
11471 heredoc->striptabs = 1;
11473 /*heredoc->striptabs = 0; - stzalloc did it */
11479 np->type = NFROMFD;
11483 np->type = NFROMTO;
11495 goto parseredir_return;
11499 * Parse a substitution. At this point, we have read the dollar sign
11500 * and nothing else.
11503 /* is_special(c) evaluates to 1 for c in "!#$*-0123456789?@"; 0 otherwise
11504 * (assuming ascii char codes, as the original implementation did) */
11505 #define is_special(c) \
11506 (((unsigned)(c) - 33 < 32) \
11507 && ((0xc1ff920dU >> ((unsigned)(c) - 33)) & 1))
11509 unsigned char subtype;
11514 if (c > 255 /* PEOA or PEOF */
11515 || (c != '(' && c != '{' && !is_name(c) && !is_special(c))
11517 #if ENABLE_ASH_BASH_COMPAT
11518 if (syntax != DQSYNTAX && c == '\'')
11519 bash_dollar_squote = 1;
11524 } else if (c == '(') {
11525 /* $(command) or $((arith)) */
11526 if (pgetc() == '(') {
11527 #if ENABLE_SH_MATH_SUPPORT
11530 raise_error_syntax("you disabled math support for $((arith)) syntax");
11537 /* $VAR, $<specialchar>, ${...}, or PEOA/PEOF */
11538 USTPUTC(CTLVAR, out);
11539 typeloc = out - (char *)stackblock();
11540 USTPUTC(VSNORMAL, out);
11541 subtype = VSNORMAL;
11547 c = '#'; /* ${#} - same as $# */
11549 subtype = VSLENGTH; /* ${#VAR} */
11554 if (c <= 255 /* not PEOA or PEOF */ && is_name(c)) {
11555 /* $[{[#]]NAME[}] */
11559 } while (c <= 255 /* not PEOA or PEOF */ && is_in_name(c));
11560 } else if (isdigit(c)) {
11561 /* $[{[#]]NUM[}] */
11565 } while (isdigit(c));
11566 } else if (is_special(c)) {
11567 /* $[{[#]]<specialchar>[}] */
11572 raise_error_syntax("bad substitution");
11574 if (c != '}' && subtype == VSLENGTH) {
11575 /* ${#VAR didn't end with } */
11581 if (subtype == 0) {
11582 static const char types[] ALIGN1 = "}-+?=";
11583 /* ${VAR...} but not $VAR or ${#VAR} */
11584 /* c == first char after VAR */
11588 #if ENABLE_ASH_BASH_COMPAT
11589 /* This check is only needed to not misinterpret
11590 * ${VAR:-WORD}, ${VAR:+WORD}, ${VAR:=WORD}, ${VAR:?WORD}
11593 if (!strchr(types, c)) {
11594 subtype = VSSUBSTR;
11596 break; /* "goto do_pungetc" is bigger (!) */
11602 const char *p = strchr(types, c);
11605 subtype = p - types + VSNORMAL;
11611 subtype = (c == '#' ? VSTRIMLEFT : VSTRIMRIGHT);
11618 #if ENABLE_ASH_BASH_COMPAT
11620 /* ${v/[/]pattern/repl} */
11621 //TODO: encode pattern and repl separately.
11622 // Currently ${v/$var_with_slash/repl} is horribly broken
11623 subtype = VSREPLACE;
11627 subtype++; /* VSREPLACEALL */
11635 ((unsigned char *)stackblock())[typeloc] = subtype | flags;
11636 if (subtype != VSNORMAL) {
11643 goto parsesub_return;
11647 * Called to parse command substitutions. Newstyle is set if the command
11648 * is enclosed inside $(...); nlpp is a pointer to the head of the linked
11649 * list of commands (passed by reference), and savelen is the number of
11650 * characters on the top of the stack which must be preserved.
11653 struct nodelist **nlpp;
11657 smallint saveprompt = 0;
11660 savelen = out - (char *)stackblock();
11663 * FIXME: this can allocate very large block on stack and SEGV.
11665 * echo "..<100kbytes>..`true` $(true) `true` ..."
11666 * allocates 100kb for every command subst. With about
11667 * a hundred command substitutions stack overflows.
11668 * With larger prepended string, SEGV happens sooner.
11670 str = alloca(savelen);
11671 memcpy(str, stackblock(), savelen);
11675 /* We must read until the closing backquote, giving special
11676 * treatment to some slashes, and then push the string and
11677 * reread it as input, interpreting it normally.
11683 STARTSTACKSTR(pout);
11687 setprompt_if(needprompt, 2);
11696 g_parsefile->linno++;
11697 setprompt_if(doprompt, 2);
11699 * If eating a newline, avoid putting
11700 * the newline into the new character
11701 * stream (via the STPUTC after the
11706 if (pc != '\\' && pc != '`' && pc != '$'
11707 && (!dblquote || pc != '"')
11709 STPUTC('\\', pout);
11711 if (pc <= 255 /* not PEOA or PEOF */) {
11717 IF_ASH_ALIAS(case PEOA:)
11718 startlinno = g_parsefile->linno;
11719 raise_error_syntax("EOF in backquote substitution");
11722 g_parsefile->linno++;
11723 needprompt = doprompt;
11732 STPUTC('\0', pout);
11733 psavelen = pout - (char *)stackblock();
11734 if (psavelen > 0) {
11735 pstr = grabstackstr(pout);
11736 setinputstring(pstr);
11741 nlpp = &(*nlpp)->next;
11742 *nlpp = stzalloc(sizeof(**nlpp));
11743 /* (*nlpp)->next = NULL; - stzalloc did it */
11746 saveprompt = doprompt;
11753 doprompt = saveprompt;
11754 else if (readtoken() != TRP)
11755 raise_error_unexpected_syntax(TRP);
11760 * Start reading from old file again, ignoring any pushed back
11761 * tokens left from the backquote parsing
11766 while (stackblocksize() <= savelen)
11768 STARTSTACKSTR(out);
11770 memcpy(out, str, savelen);
11771 STADJUST(savelen, out);
11773 USTPUTC(CTLBACKQ, out);
11775 goto parsebackq_oldreturn;
11776 goto parsebackq_newreturn;
11779 #if ENABLE_SH_MATH_SUPPORT
11781 * Parse an arithmetic expansion (indicate start of one and set state)
11784 if (++arinest == 1) {
11785 prevsyntax = syntax;
11786 syntax = ARISYNTAX;
11788 USTPUTC(CTLARI, out);
11789 goto parsearith_return;
11792 } /* end of readtoken */
11795 * Read the next input token.
11796 * If the token is a word, we set backquotelist to the list of cmds in
11797 * backquotes. We set quoteflag to true if any part of the word was
11799 * If the token is TREDIR, then we set redirnode to a structure containing
11801 * In all cases, the variable startlinno is set to the number of the line
11802 * on which the token starts.
11804 * [Change comment: here documents and internal procedures]
11805 * [Readtoken shouldn't have any arguments. Perhaps we should make the
11806 * word parsing code into a separate routine. In this case, readtoken
11807 * doesn't need to have any internal procedures, but parseword does.
11808 * We could also make parseoperator in essence the main routine, and
11809 * have parseword (readtoken1?) handle both words and redirection.]
11811 #define NEW_xxreadtoken
11812 #ifdef NEW_xxreadtoken
11813 /* singles must be first! */
11814 static const char xxreadtoken_chars[7] ALIGN1 = {
11815 '\n', '(', ')', /* singles */
11816 '&', '|', ';', /* doubles */
11820 #define xxreadtoken_singles 3
11821 #define xxreadtoken_doubles 3
11823 static const char xxreadtoken_tokens[] ALIGN1 = {
11824 TNL, TLP, TRP, /* only single occurrence allowed */
11825 TBACKGND, TPIPE, TSEMI, /* if single occurrence */
11826 TEOF, /* corresponds to trailing nul */
11827 TAND, TOR, TENDCASE /* if double occurrence */
11839 setprompt_if(needprompt, 2);
11840 startlinno = g_parsefile->linno;
11841 for (;;) { /* until token or start of word found */
11843 if (c == ' ' || c == '\t' IF_ASH_ALIAS( || c == PEOA))
11847 while ((c = pgetc()) != '\n' && c != PEOF)
11850 } else if (c == '\\') {
11851 if (pgetc() != '\n') {
11853 break; /* return readtoken1(...) */
11855 startlinno = ++g_parsefile->linno;
11856 setprompt_if(doprompt, 2);
11860 p = xxreadtoken_chars + sizeof(xxreadtoken_chars) - 1;
11863 g_parsefile->linno++;
11864 needprompt = doprompt;
11867 p = strchr(xxreadtoken_chars, c);
11869 break; /* return readtoken1(...) */
11871 if ((int)(p - xxreadtoken_chars) >= xxreadtoken_singles) {
11873 if (cc == c) { /* double occurrence? */
11874 p += xxreadtoken_doubles + 1;
11877 #if ENABLE_ASH_BASH_COMPAT
11878 if (c == '&' && cc == '>') /* &> */
11879 break; /* return readtoken1(...) */
11884 lasttoken = xxreadtoken_tokens[p - xxreadtoken_chars];
11889 return readtoken1(c, BASESYNTAX, (char *) NULL, 0);
11891 #else /* old xxreadtoken */
11892 #define RETURN(token) return lasttoken = token
11902 setprompt_if(needprompt, 2);
11903 startlinno = g_parsefile->linno;
11904 for (;;) { /* until token or start of word found */
11907 case ' ': case '\t':
11908 IF_ASH_ALIAS(case PEOA:)
11911 while ((c = pgetc()) != '\n' && c != PEOF)
11916 if (pgetc() == '\n') {
11917 startlinno = ++g_parsefile->linno;
11918 setprompt_if(doprompt, 2);
11924 g_parsefile->linno++;
11925 needprompt = doprompt;
11930 if (pgetc() == '&')
11935 if (pgetc() == '|')
11940 if (pgetc() == ';')
11953 return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
11956 #endif /* old xxreadtoken */
11962 int kwd = checkkwd;
11964 smallint alreadyseen = tokpushback;
11967 #if ENABLE_ASH_ALIAS
11983 if (t != TWORD || quoteflag) {
11988 * check for keywords
11990 if (kwd & CHKKWD) {
11991 const char *const *pp;
11993 pp = findkwd(wordtext);
11995 lasttoken = t = pp - tokname_array;
11996 TRACE(("keyword '%s' recognized\n", tokname_array[t] + 1));
12001 if (checkkwd & CHKALIAS) {
12002 #if ENABLE_ASH_ALIAS
12004 ap = lookupalias(wordtext, 1);
12007 pushstring(ap->val, ap);
12017 TRACE(("token '%s' %s\n", tokname_array[t] + 1, t == TWORD ? wordtext : ""));
12019 TRACE(("reread token '%s' %s\n", tokname_array[t] + 1, t == TWORD ? wordtext : ""));
12035 * Read and parse a command. Returns NODE_EOF on end of file.
12036 * (NULL is a valid parse tree indicating a blank line.)
12038 static union node *
12039 parsecmd(int interact)
12044 doprompt = interact;
12045 setprompt_if(doprompt, doprompt);
12051 * Input any here documents.
12056 struct heredoc *here;
12059 here = heredoclist;
12060 heredoclist = NULL;
12063 setprompt_if(needprompt, 2);
12064 readtoken1(pgetc(), here->here->type == NHERE ? SQSYNTAX : DQSYNTAX,
12065 here->eofmark, here->striptabs);
12066 n = stzalloc(sizeof(struct narg));
12067 n->narg.type = NARG;
12068 /*n->narg.next = NULL; - stzalloc did it */
12069 n->narg.text = wordtext;
12070 n->narg.backquote = backquotelist;
12071 here->here->nhere.doc = n;
12078 * called by editline -- any expansions to the prompt should be added here.
12080 #if ENABLE_ASH_EXPAND_PRMT
12081 static const char *
12082 expandstr(const char *ps)
12086 /* XXX Fix (char *) cast. It _is_ a bug. ps is variable's value,
12087 * and token processing _can_ alter it (delete NULs etc). */
12088 setinputstring((char *)ps);
12089 readtoken1(pgetc(), PSSYNTAX, nullstr, 0);
12092 n.narg.type = NARG;
12093 n.narg.next = NULL;
12094 n.narg.text = wordtext;
12095 n.narg.backquote = backquotelist;
12097 expandarg(&n, NULL, EXP_QUOTED);
12098 return stackblock();
12103 * Execute a command or commands contained in a string.
12106 evalstring(char *s, int mask)
12109 struct stackmark smark;
12113 setstackmark(&smark);
12116 while ((n = parsecmd(0)) != NODE_EOF) {
12118 popstackmark(&smark);
12131 * The eval command.
12133 static int FAST_FUNC
12134 evalcmd(int argc UNUSED_PARAM, char **argv)
12143 STARTSTACKSTR(concat);
12145 concat = stack_putstr(p, concat);
12149 STPUTC(' ', concat);
12151 STPUTC('\0', concat);
12152 p = grabstackstr(concat);
12154 evalstring(p, ~SKIPEVAL);
12160 * Read and execute commands.
12161 * "Top" is nonzero for the top level command loop;
12162 * it turns on prompting if the shell is interactive.
12168 struct stackmark smark;
12172 TRACE(("cmdloop(%d) called\n", top));
12176 setstackmark(&smark);
12179 showjobs(SHOW_CHANGED|SHOW_STDERR);
12182 if (iflag && top) {
12186 n = parsecmd(inter);
12188 if (DEBUG > 2 && debug && (n != NODE_EOF))
12191 if (n == NODE_EOF) {
12192 if (!top || numeof >= 50)
12194 if (!stoppedjobs()) {
12197 out2str("\nUse \"exit\" to leave shell.\n");
12200 } else if (nflag == 0) {
12201 /* job_warning can only be 2,1,0. Here 2->1, 1/0->0 */
12206 popstackmark(&smark);
12211 return skip & SKIPEVAL;
12218 * Take commands from a file. To be compatible we should do a path
12219 * search for the file, which is necessary to find sub-commands.
12222 find_dot_file(char *name)
12225 const char *path = pathval();
12228 /* don't try this for absolute or relative paths */
12229 if (strchr(name, '/'))
12232 /* IIRC standards do not say whether . is to be searched.
12233 * And it is even smaller this way, making it unconditional for now:
12235 if (1) { /* ENABLE_ASH_BASH_COMPAT */
12240 while ((fullname = path_advance(&path, name)) != NULL) {
12242 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
12244 * Don't bother freeing here, since it will
12245 * be freed by the caller.
12249 if (fullname != name)
12250 stunalloc(fullname);
12253 /* not found in the PATH */
12254 ash_msg_and_raise_error("%s: not found", name);
12258 static int FAST_FUNC
12259 dotcmd(int argc, char **argv)
12262 struct strlist *sp;
12263 volatile struct shparam saveparam;
12265 for (sp = cmdenviron; sp; sp = sp->next)
12266 setvareq(ckstrdup(sp->text), VSTRFIXED | VTEXTFIXED);
12269 /* bash says: "bash: .: filename argument required" */
12270 return 2; /* bash compat */
12273 /* "false; . empty_file; echo $?" should print 0, not 1: */
12276 /* This aborts if file isn't found, which is POSIXly correct.
12277 * bash returns exitcode 1 instead.
12279 fullname = find_dot_file(argv[1]);
12282 if (argc) { /* argc > 0, argv[0] != NULL */
12283 saveparam = shellparam;
12284 shellparam.malloced = 0;
12285 shellparam.nparam = argc;
12286 shellparam.p = argv;
12289 /* This aborts if file can't be opened, which is POSIXly correct.
12290 * bash returns exitcode 1 instead.
12292 setinputfile(fullname, INPUT_PUSH_FILE);
12293 commandname = fullname;
12298 freeparam(&shellparam);
12299 shellparam = saveparam;
12305 static int FAST_FUNC
12306 exitcmd(int argc UNUSED_PARAM, char **argv)
12311 exitstatus = number(argv[1]);
12312 raise_exception(EXEXIT);
12317 * Read a file containing shell functions.
12320 readcmdfile(char *name)
12322 setinputfile(name, INPUT_PUSH_FILE);
12328 /* ============ find_command inplementation */
12331 * Resolve a command name. If you change this routine, you may have to
12332 * change the shellexec routine as well.
12335 find_command(char *name, struct cmdentry *entry, int act, const char *path)
12337 struct tblentry *cmdp;
12344 struct builtincmd *bcmd;
12346 /* If name contains a slash, don't use PATH or hash table */
12347 if (strchr(name, '/') != NULL) {
12348 entry->u.index = -1;
12349 if (act & DO_ABS) {
12350 while (stat(name, &statb) < 0) {
12352 if (errno == EINTR)
12355 entry->cmdtype = CMDUNKNOWN;
12359 entry->cmdtype = CMDNORMAL;
12363 /* #if ENABLE_FEATURE_SH_STANDALONE... moved after builtin check */
12365 updatetbl = (path == pathval());
12368 if (strstr(path, "%builtin") != NULL)
12369 act |= DO_ALTBLTIN;
12372 /* If name is in the table, check answer will be ok */
12373 cmdp = cmdlookup(name, 0);
12374 if (cmdp != NULL) {
12377 switch (cmdp->cmdtype) {
12395 } else if (cmdp->rehash == 0)
12396 /* if not invalidated by cd, we're done */
12400 /* If %builtin not in path, check for builtin next */
12401 bcmd = find_builtin(name);
12403 if (IS_BUILTIN_REGULAR(bcmd))
12404 goto builtin_success;
12405 if (act & DO_ALTPATH) {
12406 if (!(act & DO_ALTBLTIN))
12407 goto builtin_success;
12408 } else if (builtinloc <= 0) {
12409 goto builtin_success;
12413 #if ENABLE_FEATURE_SH_STANDALONE
12415 int applet_no = find_applet_by_name(name);
12416 if (applet_no >= 0) {
12417 entry->cmdtype = CMDNORMAL;
12418 entry->u.index = -2 - applet_no;
12424 /* We have to search path. */
12425 prev = -1; /* where to start */
12426 if (cmdp && cmdp->rehash) { /* doing a rehash */
12427 if (cmdp->cmdtype == CMDBUILTIN)
12430 prev = cmdp->param.index;
12436 while ((fullname = path_advance(&path, name)) != NULL) {
12437 stunalloc(fullname);
12438 /* NB: code below will still use fullname
12439 * despite it being "unallocated" */
12442 if (prefix(pathopt, "builtin")) {
12444 goto builtin_success;
12447 if ((act & DO_NOFUNC)
12448 || !prefix(pathopt, "func")
12449 ) { /* ignore unimplemented options */
12453 /* if rehash, don't redo absolute path names */
12454 if (fullname[0] == '/' && idx <= prev) {
12457 TRACE(("searchexec \"%s\": no change\n", name));
12460 while (stat(fullname, &statb) < 0) {
12462 if (errno == EINTR)
12465 if (errno != ENOENT && errno != ENOTDIR)
12469 e = EACCES; /* if we fail, this will be the error */
12470 if (!S_ISREG(statb.st_mode))
12472 if (pathopt) { /* this is a %func directory */
12473 stalloc(strlen(fullname) + 1);
12474 /* NB: stalloc will return space pointed by fullname
12475 * (because we don't have any intervening allocations
12476 * between stunalloc above and this stalloc) */
12477 readcmdfile(fullname);
12478 cmdp = cmdlookup(name, 0);
12479 if (cmdp == NULL || cmdp->cmdtype != CMDFUNCTION)
12480 ash_msg_and_raise_error("%s not defined in %s", name, fullname);
12481 stunalloc(fullname);
12484 TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
12486 entry->cmdtype = CMDNORMAL;
12487 entry->u.index = idx;
12491 cmdp = cmdlookup(name, 1);
12492 cmdp->cmdtype = CMDNORMAL;
12493 cmdp->param.index = idx;
12498 /* We failed. If there was an entry for this command, delete it */
12499 if (cmdp && updatetbl)
12500 delete_cmd_entry();
12502 ash_msg("%s: %s", name, errmsg(e, "not found"));
12503 entry->cmdtype = CMDUNKNOWN;
12508 entry->cmdtype = CMDBUILTIN;
12509 entry->u.cmd = bcmd;
12513 cmdp = cmdlookup(name, 1);
12514 cmdp->cmdtype = CMDBUILTIN;
12515 cmdp->param.cmd = bcmd;
12519 entry->cmdtype = cmdp->cmdtype;
12520 entry->u = cmdp->param;
12524 /* ============ trap.c */
12527 * The trap builtin.
12529 static int FAST_FUNC
12530 trapcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12534 int signo, exitcode;
12539 for (signo = 0; signo < NSIG; signo++) {
12540 char *tr = trap_ptr[signo];
12542 /* note: bash adds "SIG", but only if invoked
12543 * as "bash". If called as "sh", or if set -o posix,
12544 * then it prints short signal names.
12545 * We are printing short names: */
12546 out1fmt("trap -- %s %s\n",
12548 get_signame(signo));
12549 /* trap_ptr != trap only if we are in special-cased `trap` code.
12550 * In this case, we will exit very soon, no need to free(). */
12551 /* if (trap_ptr != trap && tp[0]) */
12556 if (trap_ptr != trap) {
12569 signo = get_signum(*ap);
12571 /* Mimic bash message exactly */
12572 ash_msg("%s: invalid signal specification", *ap);
12578 if (LONE_DASH(action))
12581 action = ckstrdup(action);
12585 may_have_traps = 1;
12586 trap[signo] = action;
12597 /* ============ Builtins */
12599 #if ENABLE_ASH_HELP
12600 static int FAST_FUNC
12601 helpcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12607 "Built-in commands:\n"
12608 "------------------\n");
12609 for (col = 0, i = 0; i < ARRAY_SIZE(builtintab); i++) {
12610 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '),
12611 builtintab[i].name + 1);
12617 # if ENABLE_FEATURE_SH_STANDALONE
12619 const char *a = applet_names;
12621 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '), a);
12626 while (*a++ != '\0')
12632 return EXIT_SUCCESS;
12637 static int FAST_FUNC
12638 historycmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12640 show_history(line_input_state);
12641 return EXIT_SUCCESS;
12646 * The export and readonly commands.
12648 static int FAST_FUNC
12649 exportcmd(int argc UNUSED_PARAM, char **argv)
12659 /* "readonly" in bash accepts, but ignores -n.
12660 * We do the same: it saves a conditional in nextopt's param.
12663 while ((opt = nextopt("np")) != '\0') {
12665 flag_off = VEXPORT;
12668 if (argv[0][0] == 'r') {
12670 flag_off = 0; /* readonly ignores -n */
12672 flag_off = ~flag_off;
12674 /*if (opt_p_not_specified) - bash doesnt check this. Try "export -p NAME" */
12680 p = strchr(name, '=');
12684 vp = *findvar(hashvar(name), name);
12686 vp->flags = ((vp->flags | flag) & flag_off);
12690 setvar(name, p, (flag & flag_off));
12691 } while ((name = *++aptr) != NULL);
12696 /* No arguments. Show the list of exported or readonly vars.
12699 showvars(argv[0], flag, 0);
12704 * Delete a function if it exists.
12707 unsetfunc(const char *name)
12709 struct tblentry *cmdp;
12711 cmdp = cmdlookup(name, 0);
12712 if (cmdp != NULL && cmdp->cmdtype == CMDFUNCTION)
12713 delete_cmd_entry();
12717 * The unset builtin command. We unset the function before we unset the
12718 * variable to allow a function to be unset when there is a readonly variable
12719 * with the same name.
12721 static int FAST_FUNC
12722 unsetcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12729 while ((i = nextopt("vf")) != 0) {
12733 for (ap = argptr; *ap; ap++) {
12746 static const unsigned char timescmd_str[] ALIGN1 = {
12747 ' ', offsetof(struct tms, tms_utime),
12748 '\n', offsetof(struct tms, tms_stime),
12749 ' ', offsetof(struct tms, tms_cutime),
12750 '\n', offsetof(struct tms, tms_cstime),
12753 static int FAST_FUNC
12754 timescmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12756 unsigned long clk_tck, s, t;
12757 const unsigned char *p;
12760 clk_tck = bb_clk_tck();
12765 t = *(clock_t *)(((char *) &buf) + p[1]);
12768 out1fmt("%lum%lu.%03lus%c",
12770 (t * 1000) / clk_tck,
12778 #if ENABLE_SH_MATH_SUPPORT
12780 * The let builtin. Partially stolen from GNU Bash, the Bourne Again SHell.
12781 * Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
12783 * Copyright (C) 2003 Vladimir Oleynik <dzo@simtreas.ru>
12785 static int FAST_FUNC
12786 letcmd(int argc UNUSED_PARAM, char **argv)
12792 ash_msg_and_raise_error("expression expected");
12794 i = ash_arith(*argv);
12802 * The read builtin. Options:
12803 * -r Do not interpret '\' specially
12804 * -s Turn off echo (tty only)
12805 * -n NCHARS Read NCHARS max
12806 * -p PROMPT Display PROMPT on stderr (if input is from tty)
12807 * -t SECONDS Timeout after SECONDS (tty or pipe only)
12808 * -u FD Read from given FD instead of fd 0
12809 * This uses unbuffered input, which may be avoidable in some cases.
12810 * TODO: bash also has:
12811 * -a ARRAY Read into array[0],[1],etc
12812 * -d DELIM End on DELIM char, not newline
12813 * -e Use line editing (tty only)
12815 static int FAST_FUNC
12816 readcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12818 char *opt_n = NULL;
12819 char *opt_p = NULL;
12820 char *opt_t = NULL;
12821 char *opt_u = NULL;
12822 int read_flags = 0;
12826 while ((i = nextopt("p:u:rt:n:s")) != '\0') {
12835 read_flags |= BUILTIN_READ_SILENT;
12841 read_flags |= BUILTIN_READ_RAW;
12851 /* "read -s" needs to save/restore termios, can't allow ^C
12852 * to jump out of it.
12855 r = shell_builtin_read(setvar0,
12857 bltinlookup("IFS"), /* can be NULL */
12866 if ((uintptr_t)r > 1)
12867 ash_msg_and_raise_error(r);
12869 return (uintptr_t)r;
12872 static int FAST_FUNC
12873 umaskcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12875 static const char permuser[3] ALIGN1 = "ogu";
12878 int symbolic_mode = 0;
12880 while (nextopt("S") != '\0') {
12889 if (*argptr == NULL) {
12890 if (symbolic_mode) {
12891 char buf[sizeof(",u=rwx,g=rwx,o=rwx")];
12898 *p++ = permuser[i];
12900 /* mask is 0..0uuugggooo. i=2 selects uuu bits */
12901 if (!(mask & 0400)) *p++ = 'r';
12902 if (!(mask & 0200)) *p++ = 'w';
12903 if (!(mask & 0100)) *p++ = 'x';
12911 out1fmt("%04o\n", mask);
12914 char *modestr = *argptr;
12915 /* numeric umasks are taken as-is */
12916 /* symbolic umasks are inverted: "umask a=rx" calls umask(222) */
12917 if (!isdigit(modestr[0]))
12919 mask = bb_parse_mode(modestr, mask);
12920 if ((unsigned)mask > 0777) {
12921 ash_msg_and_raise_error("illegal mode: %s", modestr);
12923 if (!isdigit(modestr[0]))
12930 static int FAST_FUNC
12931 ulimitcmd(int argc UNUSED_PARAM, char **argv)
12933 return shell_builtin_ulimit(argv);
12936 /* ============ main() and helpers */
12939 * Called to exit the shell.
12948 #if ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
12949 save_history(line_input_state);
12952 status = exitstatus;
12953 TRACE(("pid %d, exitshell(%d)\n", getpid(), status));
12954 if (setjmp(loc.loc)) {
12955 if (exception_type == EXEXIT)
12956 /* dash bug: it just does _exit(exitstatus) here
12957 * but we have to do setjobctl(0) first!
12958 * (bug is still not fixed in dash-0.5.3 - if you run dash
12959 * under Midnight Commander, on exit from dash MC is backgrounded) */
12960 status = exitstatus;
12963 exception_handler = &loc;
12970 flush_stdout_stderr();
12980 /* from input.c: */
12981 /* we will never free this */
12982 basepf.next_to_pgetc = basepf.buf = ckmalloc(IBUFSIZ);
12985 signal(SIGCHLD, SIG_DFL);
12986 /* bash re-enables SIGHUP which is SIG_IGNed on entry.
12987 * Try: "trap '' HUP; bash; echo RET" and type "kill -HUP $$"
12989 signal(SIGHUP, SIG_DFL);
12995 struct stat st1, st2;
12998 for (envp = environ; envp && *envp; envp++) {
12999 if (strchr(*envp, '=')) {
13000 setvareq(*envp, VEXPORT|VTEXTFIXED);
13004 setvar0("PPID", utoa(getppid()));
13005 #if ENABLE_ASH_BASH_COMPAT
13006 p = lookupvar("SHLVL");
13007 setvar("SHLVL", utoa((p ? atoi(p) : 0) + 1), VEXPORT);
13008 if (!lookupvar("HOSTNAME")) {
13009 struct utsname uts;
13011 setvar0("HOSTNAME", uts.nodename);
13014 p = lookupvar("PWD");
13016 if (p[0] != '/' || stat(p, &st1) || stat(".", &st2)
13017 || st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino
13027 //usage:#define ash_trivial_usage
13028 //usage: "[-/+OPTIONS] [-/+o OPT]... [-c 'SCRIPT' [ARG0 [ARGS]] / FILE [ARGS]]"
13029 //usage:#define ash_full_usage "\n\n"
13030 //usage: "Unix shell interpreter"
13032 //usage:#if ENABLE_FEATURE_SH_IS_ASH
13033 //usage:# define sh_trivial_usage ash_trivial_usage
13034 //usage:# define sh_full_usage ash_full_usage
13036 //usage:#if ENABLE_FEATURE_BASH_IS_ASH
13037 //usage:# define bash_trivial_usage ash_trivial_usage
13038 //usage:# define bash_full_usage ash_full_usage
13042 * Process the shell command line arguments.
13045 procargs(char **argv)
13048 const char *xminusc;
13053 /* if (xargv[0]) - mmm, this is always true! */
13055 for (i = 0; i < NOPTS; i++)
13058 if (options(/*cmdline:*/ 1)) {
13059 /* it already printed err message */
13060 raise_exception(EXERROR);
13064 if (*xargv == NULL) {
13066 ash_msg_and_raise_error(bb_msg_requires_arg, "-c");
13069 if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
13073 for (i = 0; i < NOPTS; i++)
13074 if (optlist[i] == 2)
13079 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
13084 } else if (!sflag) {
13085 setinputfile(*xargv, 0);
13088 commandname = arg0;
13091 shellparam.p = xargv;
13092 #if ENABLE_ASH_GETOPTS
13093 shellparam.optind = 1;
13094 shellparam.optoff = -1;
13096 /* assert(shellparam.malloced == 0 && shellparam.nparam == 0); */
13098 shellparam.nparam++;
13105 * Read /etc/profile or .profile.
13108 read_profile(const char *name)
13112 if (setinputfile(name, INPUT_PUSH_FILE | INPUT_NOFILE_OK) < 0)
13121 * This routine is called when an error or an interrupt occurs in an
13122 * interactive shell and control is returned to the main command loop.
13130 /* from input.c: */
13131 g_parsefile->left_in_buffer = 0;
13132 g_parsefile->left_in_line = 0; /* clear input buffer */
13134 /* from parser.c: */
13137 /* from redir.c: */
13138 clearredir(/*drop:*/ 0);
13142 static short profile_buf[16384];
13143 extern int etext();
13147 * Main routine. We initialize things, parse the arguments, execute
13148 * profiles if we're a login shell, and then call cmdloop to execute
13149 * commands. The setjmp call sets up the location to jump to when an
13150 * exception occurs. When an exception occurs the variable "state"
13151 * is used to figure out how far we had gotten.
13153 int ash_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
13154 int ash_main(int argc UNUSED_PARAM, char **argv)
13156 const char *shinit;
13157 volatile smallint state;
13158 struct jmploc jmploc;
13159 struct stackmark smark;
13161 /* Initialize global data */
13165 #if ENABLE_ASH_ALIAS
13171 monitor(4, etext, profile_buf, sizeof(profile_buf), 50);
13174 #if ENABLE_FEATURE_EDITING
13175 line_input_state = new_line_input_t(FOR_SHELL | WITH_PATH_LOOKUP);
13178 if (setjmp(jmploc.loc)) {
13184 e = exception_type;
13188 if (e == EXEXIT || s == 0 || iflag == 0 || shlvl) {
13192 newline_and_flush(stderr);
13195 popstackmark(&smark);
13196 FORCE_INT_ON; /* enable interrupts */
13205 exception_handler = &jmploc;
13208 TRACE(("Shell args: "));
13209 trace_puts_args(argv);
13211 rootpid = getpid();
13214 setstackmark(&smark);
13217 if (argv[0] && argv[0][0] == '-')
13223 read_profile("/etc/profile");
13226 hp = lookupvar("HOME");
13228 hp = concat_path_file(hp, ".profile");
13237 getuid() == geteuid() && getgid() == getegid() &&
13241 shinit = lookupvar("ENV");
13242 if (shinit != NULL && *shinit != '\0') {
13243 read_profile(shinit);
13249 /* evalstring pushes parsefile stack.
13250 * Ensure we don't falsely claim that 0 (stdin)
13251 * is one of stacked source fds.
13252 * Testcase: ash -c 'exec 1>&0' must not complain. */
13253 // if (!sflag) g_parsefile->pf_fd = -1;
13254 // ^^ not necessary since now we special-case fd 0
13255 // in is_hidden_fd() to not be considered "hidden fd"
13256 evalstring(minusc, 0);
13259 if (sflag || minusc == NULL) {
13260 #if MAX_HISTORY > 0 && ENABLE_FEATURE_EDITING_SAVEHISTORY
13262 const char *hp = lookupvar("HISTFILE");
13264 hp = lookupvar("HOME");
13266 hp = concat_path_file(hp, ".ash_history");
13267 setvar0("HISTFILE", hp);
13269 hp = lookupvar("HISTFILE");
13273 line_input_state->hist_file = hp;
13274 # if ENABLE_FEATURE_SH_HISTFILESIZE
13275 hp = lookupvar("HISTFILESIZE");
13276 line_input_state->max_history = size_from_HISTFILESIZE(hp);
13280 state4: /* XXX ??? - why isn't this before the "if" statement */
13288 extern void _mcleanup(void);
13292 TRACE(("End of main reached\n"));
13299 * Copyright (c) 1989, 1991, 1993, 1994
13300 * The Regents of the University of California. All rights reserved.
13302 * This code is derived from software contributed to Berkeley by
13303 * Kenneth Almquist.
13305 * Redistribution and use in source and binary forms, with or without
13306 * modification, are permitted provided that the following conditions
13308 * 1. Redistributions of source code must retain the above copyright
13309 * notice, this list of conditions and the following disclaimer.
13310 * 2. Redistributions in binary form must reproduce the above copyright
13311 * notice, this list of conditions and the following disclaimer in the
13312 * documentation and/or other materials provided with the distribution.
13313 * 3. Neither the name of the University nor the names of its contributors
13314 * may be used to endorse or promote products derived from this software
13315 * without specific prior written permission.
13317 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
13318 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
13319 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
13320 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
13321 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
13322 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
13323 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
13324 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
13325 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
13326 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF