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, debugging info will be written to ./trace and
27 * a quit signal will generate a core dump.
30 /* Tweak debug output verbosity here */
37 #define JOBS ENABLE_ASH_JOB_CONTROL
42 #include <sys/times.h>
44 #include "busybox.h" /* for applet_names */
47 #include "shell_common.h"
48 #if ENABLE_SH_MATH_SUPPORT
51 #if ENABLE_ASH_RANDOM_SUPPORT
54 # define CLEAR_RANDOM_T(rnd) ((void)0)
57 #include "NUM_APPLETS.h"
59 /* STANDALONE does not make sense, and won't compile */
60 # undef CONFIG_FEATURE_SH_STANDALONE
61 # undef ENABLE_FEATURE_SH_STANDALONE
62 # undef IF_FEATURE_SH_STANDALONE
63 # undef IF_NOT_FEATURE_SH_STANDALONE
64 # define ENABLE_FEATURE_SH_STANDALONE 0
65 # define IF_FEATURE_SH_STANDALONE(...)
66 # define IF_NOT_FEATURE_SH_STANDALONE(...) __VA_ARGS__
70 # define PIPE_BUF 4096 /* amount of buffering in a pipe */
74 # error "Do not even bother, ash will not run on NOMMU machine"
80 //config: depends on !NOMMU
82 //config: Tha 'ash' shell adds about 60k in the default configuration and is
83 //config: the most complete and most pedantically correct shell included with
84 //config: busybox. This shell is actually a derivative of the Debian 'dash'
85 //config: shell (by Herbert Xu), which was created by porting the 'ash' shell
86 //config: (written by Kenneth Almquist) from NetBSD.
88 //config:config ASH_BASH_COMPAT
89 //config: bool "bash-compatible extensions"
91 //config: depends on ASH
93 //config: Enable bash-compatible extensions.
95 //config:config ASH_IDLE_TIMEOUT
96 //config: bool "Idle timeout variable"
98 //config: depends on ASH
100 //config: Enables bash-like auto-logout after $TMOUT seconds of idle time.
102 //config:config ASH_JOB_CONTROL
103 //config: bool "Job control"
105 //config: depends on ASH
107 //config: Enable job control in the ash shell.
109 //config:config ASH_ALIAS
110 //config: bool "Alias support"
112 //config: depends on ASH
114 //config: Enable alias support in the ash shell.
116 //config:config ASH_GETOPTS
117 //config: bool "Builtin getopt to parse positional parameters"
119 //config: depends on ASH
121 //config: Enable support for getopts builtin in ash.
123 //config:config ASH_BUILTIN_ECHO
124 //config: bool "Builtin version of 'echo'"
126 //config: depends on ASH
128 //config: Enable support for echo builtin in ash.
130 //config:config ASH_BUILTIN_PRINTF
131 //config: bool "Builtin version of 'printf'"
133 //config: depends on ASH
135 //config: Enable support for printf builtin in ash.
137 //config:config ASH_BUILTIN_TEST
138 //config: bool "Builtin version of 'test'"
140 //config: depends on ASH
142 //config: Enable support for test builtin in ash.
144 //config:config ASH_CMDCMD
145 //config: bool "'command' command to override shell builtins"
147 //config: depends on ASH
149 //config: Enable support for the ash 'command' builtin, which allows
150 //config: you to run the specified command with the specified arguments,
151 //config: even when there is an ash builtin command with the same name.
153 //config:config ASH_MAIL
154 //config: bool "Check for new mail on interactive shells"
156 //config: depends on ASH
158 //config: Enable "check for new mail" function in the ash shell.
160 //config:config ASH_OPTIMIZE_FOR_SIZE
161 //config: bool "Optimize for size instead of speed"
163 //config: depends on ASH
165 //config: Compile ash for reduced size at the price of speed.
167 //config:config ASH_RANDOM_SUPPORT
168 //config: bool "Pseudorandom generator and $RANDOM variable"
170 //config: depends on ASH
172 //config: Enable pseudorandom generator and dynamic variable "$RANDOM".
173 //config: Each read of "$RANDOM" will generate a new pseudorandom value.
174 //config: You can reset the generator by using a specified start value.
175 //config: After "unset RANDOM" the generator will switch off and this
176 //config: variable will no longer have special treatment.
178 //config:config ASH_EXPAND_PRMT
179 //config: bool "Expand prompt string"
181 //config: depends on ASH
183 //config: "PS#" may contain volatile content, such as backquote commands.
184 //config: This option recreates the prompt string from the environment
185 //config: variable each time it is displayed.
188 //applet:IF_ASH(APPLET(ash, BB_DIR_BIN, BB_SUID_DROP))
189 //applet:IF_FEATURE_SH_IS_ASH(APPLET_ODDNAME(sh, ash, BB_DIR_BIN, BB_SUID_DROP, sh))
190 //applet:IF_FEATURE_BASH_IS_ASH(APPLET_ODDNAME(bash, ash, BB_DIR_BIN, BB_SUID_DROP, bash))
192 //kbuild:lib-$(CONFIG_ASH) += ash.o ash_ptr_hack.o shell_common.o
193 //kbuild:lib-$(CONFIG_ASH_RANDOM_SUPPORT) += random.o
196 /* ============ Hash table sizes. Configurable. */
200 #define CMDTABLESIZE 31 /* should be prime */
203 /* ============ Shell options */
205 static const char *const optletters_optnames[] = {
220 #if ENABLE_ASH_BASH_COMPAT
229 #define optletters(n) optletters_optnames[n][0]
230 #define optnames(n) (optletters_optnames[n] + 1)
232 enum { NOPTS = ARRAY_SIZE(optletters_optnames) };
235 /* ============ Misc data */
237 #define msg_illnum "Illegal number: %s"
240 * We enclose jmp_buf in a structure so that we can declare pointers to
241 * jump locations. The global variable handler contains the location to
242 * jump to when an exception occurs, and the global variable exception_type
243 * contains a code identifying the exception. To implement nested
244 * exception handlers, the user should save the value of handler on entry
245 * to an inner scope, set handler to point to a jmploc structure for the
246 * inner scope, and restore handler on exit from the scope.
252 struct globals_misc {
253 /* pid of main shell */
255 /* shell level: 0 for the main shell, 1 for its children, and so on */
257 #define rootshell (!shlvl)
258 char *minusc; /* argument to -c option */
260 char *curdir; // = nullstr; /* current working directory */
261 char *physdir; // = nullstr; /* physical working directory */
263 char *arg0; /* value of $0 */
265 struct jmploc *exception_handler;
267 volatile int suppress_int; /* counter */
268 volatile /*sig_atomic_t*/ smallint pending_int; /* 1 = got SIGINT */
269 /* last pending signal */
270 volatile /*sig_atomic_t*/ smallint pending_sig;
271 smallint exception_type; /* kind of exception (0..5) */
273 #define EXINT 0 /* SIGINT received */
274 #define EXERROR 1 /* a generic error */
275 #define EXSHELLPROC 2 /* execute a shell procedure */
276 #define EXEXEC 3 /* command execution failed */
277 #define EXEXIT 4 /* exit the shell */
278 #define EXSIG 5 /* trapped signal in wait(1) */
281 char nullstr[1]; /* zero length string */
284 #define eflag optlist[0]
285 #define fflag optlist[1]
286 #define Iflag optlist[2]
287 #define iflag optlist[3]
288 #define mflag optlist[4]
289 #define nflag optlist[5]
290 #define sflag optlist[6]
291 #define xflag optlist[7]
292 #define vflag optlist[8]
293 #define Cflag optlist[9]
294 #define aflag optlist[10]
295 #define bflag optlist[11]
296 #define uflag optlist[12]
297 #define viflag optlist[13]
298 #if ENABLE_ASH_BASH_COMPAT
299 # define pipefail optlist[14]
304 # define nolog optlist[14 + ENABLE_ASH_BASH_COMPAT]
305 # define debug optlist[15 + ENABLE_ASH_BASH_COMPAT]
308 /* trap handler commands */
310 * Sigmode records the current value of the signal handlers for the various
311 * modes. A value of zero means that the current handler is not known.
312 * S_HARD_IGN indicates that the signal was ignored on entry to the shell.
314 char sigmode[NSIG - 1];
315 #define S_DFL 1 /* default signal handling (SIG_DFL) */
316 #define S_CATCH 2 /* signal is caught */
317 #define S_IGN 3 /* signal is ignored (SIG_IGN) */
318 #define S_HARD_IGN 4 /* signal is ignored permenantly */
320 /* indicates specified signal received */
321 uint8_t gotsig[NSIG - 1]; /* offset by 1: "signal" 0 is meaningless */
322 uint8_t may_have_traps; /* 0: definitely no traps are set, 1: some traps may be set */
324 char **trap_ptr; /* used only by "trap hack" */
326 /* Rarely referenced stuff */
327 #if ENABLE_ASH_RANDOM_SUPPORT
330 pid_t backgndpid; /* pid of last background process */
331 smallint job_warning; /* user was warned about stopped jobs (can be 2, 1 or 0). */
333 extern struct globals_misc *const ash_ptr_to_globals_misc;
334 #define G_misc (*ash_ptr_to_globals_misc)
335 #define rootpid (G_misc.rootpid )
336 #define shlvl (G_misc.shlvl )
337 #define minusc (G_misc.minusc )
338 #define curdir (G_misc.curdir )
339 #define physdir (G_misc.physdir )
340 #define arg0 (G_misc.arg0 )
341 #define exception_handler (G_misc.exception_handler)
342 #define exception_type (G_misc.exception_type )
343 #define suppress_int (G_misc.suppress_int )
344 #define pending_int (G_misc.pending_int )
345 #define pending_sig (G_misc.pending_sig )
346 #define isloginsh (G_misc.isloginsh )
347 #define nullstr (G_misc.nullstr )
348 #define optlist (G_misc.optlist )
349 #define sigmode (G_misc.sigmode )
350 #define gotsig (G_misc.gotsig )
351 #define may_have_traps (G_misc.may_have_traps )
352 #define trap (G_misc.trap )
353 #define trap_ptr (G_misc.trap_ptr )
354 #define random_gen (G_misc.random_gen )
355 #define backgndpid (G_misc.backgndpid )
356 #define job_warning (G_misc.job_warning)
357 #define INIT_G_misc() do { \
358 (*(struct globals_misc**)&ash_ptr_to_globals_misc) = xzalloc(sizeof(G_misc)); \
366 /* ============ DEBUG */
368 static void trace_printf(const char *fmt, ...);
369 static void trace_vprintf(const char *fmt, va_list va);
370 # define TRACE(param) trace_printf param
371 # define TRACEV(param) trace_vprintf param
372 # define close(fd) do { \
374 if (close(dfd) < 0) \
375 bb_error_msg("bug on %d: closing %d(0x%x)", \
376 __LINE__, dfd, dfd); \
379 # define TRACE(param)
380 # define TRACEV(param)
384 /* ============ Utility functions */
385 #define xbarrier() do { __asm__ __volatile__ ("": : :"memory"); } while (0)
387 static int isdigit_str9(const char *str)
389 int maxlen = 9 + 1; /* max 9 digits: 999999999 */
390 while (--maxlen && isdigit(*str))
392 return (*str == '\0');
395 static const char *var_end(const char *var)
404 /* ============ Interrupts / exceptions */
406 static void exitshell(void) NORETURN;
409 * These macros allow the user to suspend the handling of interrupt signals
410 * over a period of time. This is similar to SIGHOLD or to sigblock, but
411 * much more efficient and portable. (But hacking the kernel is so much
412 * more fun than worrying about efficiency and portability. :-))
414 #define INT_OFF do { \
420 * Called to raise an exception. Since C doesn't include exceptions, we
421 * just do a longjmp to the exception handler. The type of exception is
422 * stored in the global variable "exception_type".
424 static void raise_exception(int) NORETURN;
426 raise_exception(int e)
429 if (exception_handler == NULL)
434 longjmp(exception_handler->loc, 1);
437 #define raise_exception(e) do { \
438 TRACE(("raising exception %d on line %d\n", (e), __LINE__)); \
439 raise_exception(e); \
444 * Called from trap.c when a SIGINT is received. (If the user specifies
445 * that SIGINT is to be trapped or ignored using the trap builtin, then
446 * this routine is not called.) Suppressint is nonzero when interrupts
447 * are held using the INT_OFF macro. (The test for iflag is just
448 * defensive programming.)
450 static void raise_interrupt(void) NORETURN;
452 raise_interrupt(void)
457 /* Signal is not automatically unmasked after it is raised,
458 * do it ourself - unmask all signals */
459 sigprocmask_allsigs(SIG_UNBLOCK);
460 /* pending_sig = 0; - now done in signal_handler() */
463 if (gotsig[SIGINT - 1] && !trap[SIGINT]) {
464 if (!(rootshell && iflag)) {
465 /* Kill ourself with SIGINT */
466 signal(SIGINT, SIG_DFL);
471 raise_exception(ex_type);
475 #define raise_interrupt() do { \
476 TRACE(("raising interrupt on line %d\n", __LINE__)); \
481 static IF_ASH_OPTIMIZE_FOR_SIZE(inline) void
485 if (--suppress_int == 0 && pending_int) {
489 #define INT_ON int_on()
490 static IF_ASH_OPTIMIZE_FOR_SIZE(inline) void
498 #define FORCE_INT_ON force_int_on()
500 #define SAVE_INT(v) ((v) = suppress_int)
502 #define RESTORE_INT(v) do { \
504 suppress_int = (v); \
505 if (suppress_int == 0 && pending_int) \
510 /* ============ Stdout/stderr output */
513 outstr(const char *p, FILE *file)
521 flush_stdout_stderr(void)
529 outcslow(int c, FILE *dest)
537 static int out1fmt(const char *, ...) __attribute__((__format__(__printf__,1,2)));
539 out1fmt(const char *fmt, ...)
546 r = vprintf(fmt, ap);
552 static int fmtstr(char *, size_t, const char *, ...) __attribute__((__format__(__printf__,3,4)));
554 fmtstr(char *outbuf, size_t length, const char *fmt, ...)
561 ret = vsnprintf(outbuf, length, fmt, ap);
568 out1str(const char *p)
574 out2str(const char *p)
577 flush_stdout_stderr();
581 /* ============ Parser structures */
583 /* control characters in argument strings */
584 #define CTL_FIRST CTLESC
585 #define CTLESC ((unsigned char)'\201') /* escape next character */
586 #define CTLVAR ((unsigned char)'\202') /* variable defn */
587 #define CTLENDVAR ((unsigned char)'\203')
588 #define CTLBACKQ ((unsigned char)'\204')
589 #define CTLQUOTE 01 /* ored with CTLBACKQ code if in quotes */
590 /* CTLBACKQ | CTLQUOTE == '\205' */
591 #define CTLARI ((unsigned char)'\206') /* arithmetic expression */
592 #define CTLENDARI ((unsigned char)'\207')
593 #define CTLQUOTEMARK ((unsigned char)'\210')
594 #define CTL_LAST CTLQUOTEMARK
596 /* variable substitution byte (follows CTLVAR) */
597 #define VSTYPE 0x0f /* type of variable substitution */
598 #define VSNUL 0x10 /* colon--treat the empty string as unset */
599 #define VSQUOTE 0x80 /* inside double quotes--suppress splitting */
601 /* values of VSTYPE field */
602 #define VSNORMAL 0x1 /* normal variable: $var or ${var} */
603 #define VSMINUS 0x2 /* ${var-text} */
604 #define VSPLUS 0x3 /* ${var+text} */
605 #define VSQUESTION 0x4 /* ${var?message} */
606 #define VSASSIGN 0x5 /* ${var=text} */
607 #define VSTRIMRIGHT 0x6 /* ${var%pattern} */
608 #define VSTRIMRIGHTMAX 0x7 /* ${var%%pattern} */
609 #define VSTRIMLEFT 0x8 /* ${var#pattern} */
610 #define VSTRIMLEFTMAX 0x9 /* ${var##pattern} */
611 #define VSLENGTH 0xa /* ${#var} */
612 #if ENABLE_ASH_BASH_COMPAT
613 #define VSSUBSTR 0xc /* ${var:position:length} */
614 #define VSREPLACE 0xd /* ${var/pattern/replacement} */
615 #define VSREPLACEALL 0xe /* ${var//pattern/replacement} */
618 static const char dolatstr[] ALIGN1 = {
619 CTLVAR, VSNORMAL|VSQUOTE, '@', '=', '\0'
639 #if ENABLE_ASH_BASH_COMPAT
656 smallint type; /* Nxxxx */
659 union node *redirect;
664 smallint pipe_backgnd;
665 struct nodelist *cmdlist;
671 union node *redirect;
684 union node *elsepart;
711 struct nodelist *backquote;
714 /* nfile and ndup layout must match!
715 * NTOFD (>&fdnum) uses ndup structure, but we may discover mid-flight
716 * that it is actually NTO2 (>&file), and change its type.
733 char *_unused_expfname;
752 struct nredir nredir;
753 struct nbinary nbinary;
757 struct nclist nclist;
766 * NODE_EOF is returned by parsecmd when it encounters an end of file.
767 * It must be distinct from NULL.
769 #define NODE_EOF ((union node *) -1L)
772 struct nodelist *next;
785 freefunc(struct funcnode *f)
787 if (f && --f->count < 0)
792 /* ============ Debugging output */
796 static FILE *tracefile;
799 trace_printf(const char *fmt, ...)
806 fprintf(tracefile, "%u ", (int) time(NULL));
808 fprintf(tracefile, "[%u] ", (int) getpid());
810 fprintf(tracefile, "pending s:%d i:%d(supp:%d) ", pending_sig, pending_int, suppress_int);
812 vfprintf(tracefile, fmt, va);
817 trace_vprintf(const char *fmt, va_list va)
822 fprintf(tracefile, "%u ", (int) time(NULL));
824 fprintf(tracefile, "[%u] ", (int) getpid());
826 fprintf(tracefile, "pending s:%d i:%d(supp:%d) ", pending_sig, pending_int, suppress_int);
827 vfprintf(tracefile, fmt, va);
831 trace_puts(const char *s)
839 trace_puts_quoted(char *s)
846 putc('"', tracefile);
847 for (p = s; *p; p++) {
848 switch ((unsigned char)*p) {
849 case '\n': c = 'n'; goto backslash;
850 case '\t': c = 't'; goto backslash;
851 case '\r': c = 'r'; goto backslash;
852 case '\"': c = '\"'; goto backslash;
853 case '\\': c = '\\'; goto backslash;
854 case CTLESC: c = 'e'; goto backslash;
855 case CTLVAR: c = 'v'; goto backslash;
856 case CTLVAR+CTLQUOTE: c = 'V'; goto backslash;
857 case CTLBACKQ: c = 'q'; goto backslash;
858 case CTLBACKQ+CTLQUOTE: c = 'Q'; goto backslash;
860 putc('\\', tracefile);
864 if (*p >= ' ' && *p <= '~')
867 putc('\\', tracefile);
868 putc((*p >> 6) & 03, tracefile);
869 putc((*p >> 3) & 07, tracefile);
870 putc(*p & 07, tracefile);
875 putc('"', tracefile);
879 trace_puts_args(char **ap)
886 trace_puts_quoted(*ap);
888 putc('\n', tracefile);
891 putc(' ', tracefile);
906 /* leave open because libedit might be using it */
909 strcpy(s, "./trace");
911 if (!freopen(s, "a", tracefile)) {
912 fprintf(stderr, "Can't re-open %s\n", s);
917 tracefile = fopen(s, "a");
918 if (tracefile == NULL) {
919 fprintf(stderr, "Can't open %s\n", s);
925 flags = fcntl(fileno(tracefile), F_GETFL);
927 fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND);
929 setlinebuf(tracefile);
930 fputs("\nTracing started.\n", tracefile);
934 indent(int amount, char *pfx, FILE *fp)
938 for (i = 0; i < amount; i++) {
939 if (pfx && i == amount - 1)
945 /* little circular references here... */
946 static void shtree(union node *n, int ind, char *pfx, FILE *fp);
949 sharg(union node *arg, FILE *fp)
952 struct nodelist *bqlist;
953 unsigned char subtype;
955 if (arg->type != NARG) {
956 out1fmt("<node type %d>\n", arg->type);
959 bqlist = arg->narg.backquote;
960 for (p = arg->narg.text; *p; p++) {
961 switch ((unsigned char)*p) {
970 if (subtype == VSLENGTH)
981 switch (subtype & VSTYPE) {
1007 case VSTRIMRIGHTMAX:
1014 out1fmt("<subtype %d>", subtype);
1021 case CTLBACKQ|CTLQUOTE:
1024 shtree(bqlist->n, -1, NULL, fp);
1035 shcmd(union node *cmd, FILE *fp)
1043 for (np = cmd->ncmd.args; np; np = np->narg.next) {
1049 for (np = cmd->ncmd.redirect; np; np = np->nfile.next) {
1053 switch (np->nfile.type) {
1054 case NTO: s = ">>"+1; dftfd = 1; break;
1055 case NCLOBBER: s = ">|"; dftfd = 1; break;
1056 case NAPPEND: s = ">>"; dftfd = 1; break;
1057 #if ENABLE_ASH_BASH_COMPAT
1060 case NTOFD: s = ">&"; dftfd = 1; break;
1061 case NFROM: s = "<"; break;
1062 case NFROMFD: s = "<&"; break;
1063 case NFROMTO: s = "<>"; break;
1064 default: s = "*error*"; break;
1066 if (np->nfile.fd != dftfd)
1067 fprintf(fp, "%d", np->nfile.fd);
1069 if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) {
1070 fprintf(fp, "%d", np->ndup.dupfd);
1072 sharg(np->nfile.fname, fp);
1079 shtree(union node *n, int ind, char *pfx, FILE *fp)
1081 struct nodelist *lp;
1087 indent(ind, pfx, fp);
1089 if (n == NODE_EOF) {
1104 shtree(n->nbinary.ch1, ind, NULL, fp);
1107 shtree(n->nbinary.ch2, ind, NULL, fp);
1115 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
1116 shtree(lp->n, 0, NULL, fp);
1120 if (n->npipe.pipe_backgnd)
1126 fprintf(fp, "<node type %d>", n->type);
1134 showtree(union node *n)
1136 trace_puts("showtree called\n");
1137 shtree(n, 1, NULL, stderr);
1143 /* ============ Parser data */
1146 * ash_vmsg() needs parsefile->fd, hence parsefile definition is moved up.
1149 struct strlist *next;
1156 struct strpush *prev; /* preceding string on stack */
1158 int prev_left_in_line;
1159 #if ENABLE_ASH_ALIAS
1160 struct alias *ap; /* if push was associated with an alias */
1162 char *string; /* remember the string since it may change */
1166 struct parsefile *prev; /* preceding file on stack */
1167 int linno; /* current line */
1168 int pf_fd; /* file descriptor (or -1 if string) */
1169 int left_in_line; /* number of chars left in this line */
1170 int left_in_buffer; /* number of chars left in this buffer past the line */
1171 char *next_to_pgetc; /* next char in buffer */
1172 char *buf; /* input buffer */
1173 struct strpush *strpush; /* for pushing strings at this level */
1174 struct strpush basestrpush; /* so pushing one is fast */
1177 static struct parsefile basepf; /* top level input file */
1178 static struct parsefile *g_parsefile = &basepf; /* current input file */
1179 static int startlinno; /* line # where last token started */
1180 static char *commandname; /* currently executing command */
1181 static struct strlist *cmdenviron; /* environment for builtin command */
1182 static uint8_t exitstatus; /* exit status of last command */
1185 /* ============ Message printing */
1188 ash_vmsg(const char *msg, va_list ap)
1190 fprintf(stderr, "%s: ", arg0);
1192 if (strcmp(arg0, commandname))
1193 fprintf(stderr, "%s: ", commandname);
1194 if (!iflag || g_parsefile->pf_fd > 0)
1195 fprintf(stderr, "line %d: ", startlinno);
1197 vfprintf(stderr, msg, ap);
1198 outcslow('\n', stderr);
1202 * Exverror is called to raise the error exception. If the second argument
1203 * is not NULL then error prints an error message using printf style
1204 * formatting. It then raises the error exception.
1206 static void ash_vmsg_and_raise(int, const char *, va_list) NORETURN;
1208 ash_vmsg_and_raise(int cond, const char *msg, va_list ap)
1212 TRACE(("ash_vmsg_and_raise(%d, \"", cond));
1214 TRACE(("\") pid=%d\n", getpid()));
1216 TRACE(("ash_vmsg_and_raise(%d, NULL) pid=%d\n", cond, getpid()));
1221 flush_stdout_stderr();
1222 raise_exception(cond);
1226 static void ash_msg_and_raise_error(const char *, ...) NORETURN;
1228 ash_msg_and_raise_error(const char *msg, ...)
1233 ash_vmsg_and_raise(EXERROR, msg, ap);
1238 static void raise_error_syntax(const char *) NORETURN;
1240 raise_error_syntax(const char *msg)
1242 ash_msg_and_raise_error("syntax error: %s", msg);
1246 static void ash_msg_and_raise(int, const char *, ...) NORETURN;
1248 ash_msg_and_raise(int cond, const char *msg, ...)
1253 ash_vmsg_and_raise(cond, msg, ap);
1259 * error/warning routines for external builtins
1262 ash_msg(const char *fmt, ...)
1272 * Return a string describing an error. The returned string may be a
1273 * pointer to a static buffer that will be overwritten on the next call.
1274 * Action describes the operation that got the error.
1277 errmsg(int e, const char *em)
1279 if (e == ENOENT || e == ENOTDIR) {
1286 /* ============ Memory allocation */
1289 /* I consider these wrappers nearly useless:
1290 * ok, they return you to nearest exception handler, but
1291 * how much memory do you leak in the process, making
1292 * memory starvation worse?
1295 ckrealloc(void * p, size_t nbytes)
1297 p = realloc(p, nbytes);
1299 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1304 ckmalloc(size_t nbytes)
1306 return ckrealloc(NULL, nbytes);
1310 ckzalloc(size_t nbytes)
1312 return memset(ckmalloc(nbytes), 0, nbytes);
1316 ckstrdup(const char *s)
1318 char *p = strdup(s);
1320 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1324 /* Using bbox equivalents. They exit if out of memory */
1325 # define ckrealloc xrealloc
1326 # define ckmalloc xmalloc
1327 # define ckzalloc xzalloc
1328 # define ckstrdup xstrdup
1332 * It appears that grabstackstr() will barf with such alignments
1333 * because stalloc() will return a string allocated in a new stackblock.
1335 #define SHELL_ALIGN(nbytes) (((nbytes) + SHELL_SIZE) & ~SHELL_SIZE)
1337 /* Most machines require the value returned from malloc to be aligned
1338 * in some way. The following macro will get this right
1339 * on many machines. */
1340 SHELL_SIZE = sizeof(union { int i; char *cp; double d; }) - 1,
1341 /* Minimum size of a block */
1342 MINSIZE = SHELL_ALIGN(504),
1345 struct stack_block {
1346 struct stack_block *prev;
1347 char space[MINSIZE];
1351 struct stack_block *stackp;
1354 struct stackmark *marknext;
1358 struct globals_memstack {
1359 struct stack_block *g_stackp; // = &stackbase;
1360 struct stackmark *markp;
1361 char *g_stacknxt; // = stackbase.space;
1362 char *sstrend; // = stackbase.space + MINSIZE;
1363 size_t g_stacknleft; // = MINSIZE;
1364 int herefd; // = -1;
1365 struct stack_block stackbase;
1367 extern struct globals_memstack *const ash_ptr_to_globals_memstack;
1368 #define G_memstack (*ash_ptr_to_globals_memstack)
1369 #define g_stackp (G_memstack.g_stackp )
1370 #define markp (G_memstack.markp )
1371 #define g_stacknxt (G_memstack.g_stacknxt )
1372 #define sstrend (G_memstack.sstrend )
1373 #define g_stacknleft (G_memstack.g_stacknleft)
1374 #define herefd (G_memstack.herefd )
1375 #define stackbase (G_memstack.stackbase )
1376 #define INIT_G_memstack() do { \
1377 (*(struct globals_memstack**)&ash_ptr_to_globals_memstack) = xzalloc(sizeof(G_memstack)); \
1379 g_stackp = &stackbase; \
1380 g_stacknxt = stackbase.space; \
1381 g_stacknleft = MINSIZE; \
1382 sstrend = stackbase.space + MINSIZE; \
1387 #define stackblock() ((void *)g_stacknxt)
1388 #define stackblocksize() g_stacknleft
1391 * Parse trees for commands are allocated in lifo order, so we use a stack
1392 * to make this more efficient, and also to avoid all sorts of exception
1393 * handling code to handle interrupts in the middle of a parse.
1395 * The size 504 was chosen because the Ultrix malloc handles that size
1399 stalloc(size_t nbytes)
1404 aligned = SHELL_ALIGN(nbytes);
1405 if (aligned > g_stacknleft) {
1408 struct stack_block *sp;
1410 blocksize = aligned;
1411 if (blocksize < MINSIZE)
1412 blocksize = MINSIZE;
1413 len = sizeof(struct stack_block) - MINSIZE + blocksize;
1414 if (len < blocksize)
1415 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1418 sp->prev = g_stackp;
1419 g_stacknxt = sp->space;
1420 g_stacknleft = blocksize;
1421 sstrend = g_stacknxt + blocksize;
1426 g_stacknxt += aligned;
1427 g_stacknleft -= aligned;
1432 stzalloc(size_t nbytes)
1434 return memset(stalloc(nbytes), 0, nbytes);
1441 if (!p || (g_stacknxt < (char *)p) || ((char *)p < g_stackp->space)) {
1442 write(STDERR_FILENO, "stunalloc\n", 10);
1446 g_stacknleft += g_stacknxt - (char *)p;
1451 * Like strdup but works with the ash stack.
1454 ststrdup(const char *p)
1456 size_t len = strlen(p) + 1;
1457 return memcpy(stalloc(len), p, len);
1461 setstackmark(struct stackmark *mark)
1463 mark->stackp = g_stackp;
1464 mark->stacknxt = g_stacknxt;
1465 mark->stacknleft = g_stacknleft;
1466 mark->marknext = markp;
1471 popstackmark(struct stackmark *mark)
1473 struct stack_block *sp;
1479 markp = mark->marknext;
1480 while (g_stackp != mark->stackp) {
1482 g_stackp = sp->prev;
1485 g_stacknxt = mark->stacknxt;
1486 g_stacknleft = mark->stacknleft;
1487 sstrend = mark->stacknxt + mark->stacknleft;
1492 * When the parser reads in a string, it wants to stick the string on the
1493 * stack and only adjust the stack pointer when it knows how big the
1494 * string is. Stackblock (defined in stack.h) returns a pointer to a block
1495 * of space on top of the stack and stackblocklen returns the length of
1496 * this block. Growstackblock will grow this space by at least one byte,
1497 * possibly moving it (like realloc). Grabstackblock actually allocates the
1498 * part of the block that has been used.
1501 growstackblock(void)
1505 newlen = g_stacknleft * 2;
1506 if (newlen < g_stacknleft)
1507 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1511 if (g_stacknxt == g_stackp->space && g_stackp != &stackbase) {
1512 struct stack_block *oldstackp;
1513 struct stackmark *xmark;
1514 struct stack_block *sp;
1515 struct stack_block *prevstackp;
1519 oldstackp = g_stackp;
1521 prevstackp = sp->prev;
1522 grosslen = newlen + sizeof(struct stack_block) - MINSIZE;
1523 sp = ckrealloc(sp, grosslen);
1524 sp->prev = prevstackp;
1526 g_stacknxt = sp->space;
1527 g_stacknleft = newlen;
1528 sstrend = sp->space + newlen;
1531 * Stack marks pointing to the start of the old block
1532 * must be relocated to point to the new block
1535 while (xmark != NULL && xmark->stackp == oldstackp) {
1536 xmark->stackp = g_stackp;
1537 xmark->stacknxt = g_stacknxt;
1538 xmark->stacknleft = g_stacknleft;
1539 xmark = xmark->marknext;
1543 char *oldspace = g_stacknxt;
1544 size_t oldlen = g_stacknleft;
1545 char *p = stalloc(newlen);
1547 /* free the space we just allocated */
1548 g_stacknxt = memcpy(p, oldspace, oldlen);
1549 g_stacknleft += newlen;
1554 grabstackblock(size_t len)
1556 len = SHELL_ALIGN(len);
1558 g_stacknleft -= len;
1562 * The following routines are somewhat easier to use than the above.
1563 * The user declares a variable of type STACKSTR, which may be declared
1564 * to be a register. The macro STARTSTACKSTR initializes things. Then
1565 * the user uses the macro STPUTC to add characters to the string. In
1566 * effect, STPUTC(c, p) is the same as *p++ = c except that the stack is
1567 * grown as necessary. When the user is done, she can just leave the
1568 * string there and refer to it using stackblock(). Or she can allocate
1569 * the space for it using grabstackstr(). If it is necessary to allow
1570 * someone else to use the stack temporarily and then continue to grow
1571 * the string, the user should use grabstack to allocate the space, and
1572 * then call ungrabstr(p) to return to the previous mode of operation.
1574 * USTPUTC is like STPUTC except that it doesn't check for overflow.
1575 * CHECKSTACKSPACE can be called before USTPUTC to ensure that there
1576 * is space for at least one character.
1581 size_t len = stackblocksize();
1582 if (herefd >= 0 && len >= 1024) {
1583 full_write(herefd, stackblock(), len);
1584 return stackblock();
1587 return (char *)stackblock() + len;
1591 * Called from CHECKSTRSPACE.
1594 makestrspace(size_t newlen, char *p)
1596 size_t len = p - g_stacknxt;
1597 size_t size = stackblocksize();
1602 size = stackblocksize();
1604 if (nleft >= newlen)
1608 return (char *)stackblock() + len;
1612 stack_nputstr(const char *s, size_t n, char *p)
1614 p = makestrspace(n, p);
1615 p = (char *)memcpy(p, s, n) + n;
1620 stack_putstr(const char *s, char *p)
1622 return stack_nputstr(s, strlen(s), p);
1626 _STPUTC(int c, char *p)
1634 #define STARTSTACKSTR(p) ((p) = stackblock())
1635 #define STPUTC(c, p) ((p) = _STPUTC((c), (p)))
1636 #define CHECKSTRSPACE(n, p) do { \
1639 size_t m = sstrend - q; \
1641 (p) = makestrspace(l, q); \
1643 #define USTPUTC(c, p) (*(p)++ = (c))
1644 #define STACKSTRNUL(p) do { \
1645 if ((p) == sstrend) \
1646 (p) = growstackstr(); \
1649 #define STUNPUTC(p) (--(p))
1650 #define STTOPC(p) ((p)[-1])
1651 #define STADJUST(amount, p) ((p) += (amount))
1653 #define grabstackstr(p) stalloc((char *)(p) - (char *)stackblock())
1654 #define ungrabstackstr(s, p) stunalloc(s)
1655 #define stackstrend() ((void *)sstrend)
1658 /* ============ String helpers */
1661 * prefix -- see if pfx is a prefix of string.
1664 prefix(const char *string, const char *pfx)
1667 if (*pfx++ != *string++)
1670 return (char *) string;
1674 * Check for a valid number. This should be elsewhere.
1677 is_number(const char *p)
1682 } while (*++p != '\0');
1687 * Convert a string of digits to an integer, printing an error message on
1691 number(const char *s)
1694 ash_msg_and_raise_error(msg_illnum, s);
1699 * Produce a possibly single quoted string suitable as input to the shell.
1700 * The return string is allocated on the stack.
1703 single_quote(const char *s)
1713 len = strchrnul(s, '\'') - s;
1715 q = p = makestrspace(len + 3, p);
1718 q = (char *)memcpy(q, s, len) + len;
1727 do len++; while (*++s == '\'');
1729 q = p = makestrspace(len + 3, p);
1732 q = (char *)memcpy(q, s - len, len) + len;
1740 return stackblock();
1744 /* ============ nextopt */
1746 static char **argptr; /* argument list for builtin commands */
1747 static char *optionarg; /* set by nextopt (like getopt) */
1748 static char *optptr; /* used by nextopt */
1751 * XXX - should get rid of. Have all builtins use getopt(3).
1752 * The library getopt must have the BSD extension static variable
1753 * "optreset", otherwise it can't be used within the shell safely.
1755 * Standard option processing (a la getopt) for builtin routines.
1756 * The only argument that is passed to nextopt is the option string;
1757 * the other arguments are unnecessary. It returns the character,
1758 * or '\0' on end of input.
1761 nextopt(const char *optstring)
1768 if (p == NULL || *p == '\0') {
1769 /* We ate entire "-param", take next one */
1775 if (*++p == '\0') /* just "-" ? */
1778 if (LONE_DASH(p)) /* "--" ? */
1780 /* p => next "-param" */
1782 /* p => some option char in the middle of a "-param" */
1784 for (q = optstring; *q != c;) {
1786 ash_msg_and_raise_error("illegal option -%c", c);
1794 ash_msg_and_raise_error("no arg for -%c option", c);
1804 /* ============ Shell variables */
1807 * The parsefile structure pointed to by the global variable parsefile
1808 * contains information about the current file being read.
1811 int nparam; /* # of positional parameters (without $0) */
1812 #if ENABLE_ASH_GETOPTS
1813 int optind; /* next parameter to be processed by getopts */
1814 int optoff; /* used by getopts */
1816 unsigned char malloced; /* if parameter list dynamically allocated */
1817 char **p; /* parameter list */
1821 * Free the list of positional parameters.
1824 freeparam(volatile struct shparam *param)
1826 if (param->malloced) {
1828 ap = ap1 = param->p;
1835 #if ENABLE_ASH_GETOPTS
1836 static void FAST_FUNC getoptsreset(const char *value);
1840 struct var *next; /* next entry in hash list */
1841 int flags; /* flags are defined above */
1842 const char *var_text; /* name=value */
1843 void (*var_func)(const char *) FAST_FUNC; /* function to be called when */
1844 /* the variable gets set/unset */
1848 struct localvar *next; /* next local variable in list */
1849 struct var *vp; /* the variable that was made local */
1850 int flags; /* saved flags */
1851 const char *text; /* saved text */
1855 #define VEXPORT 0x01 /* variable is exported */
1856 #define VREADONLY 0x02 /* variable cannot be modified */
1857 #define VSTRFIXED 0x04 /* variable struct is statically allocated */
1858 #define VTEXTFIXED 0x08 /* text is statically allocated */
1859 #define VSTACK 0x10 /* text is allocated on the stack */
1860 #define VUNSET 0x20 /* the variable is not set */
1861 #define VNOFUNC 0x40 /* don't call the callback function */
1862 #define VNOSET 0x80 /* do not set variable - just readonly test */
1863 #define VNOSAVE 0x100 /* when text is on the heap before setvareq */
1864 #if ENABLE_ASH_RANDOM_SUPPORT
1865 # define VDYNAMIC 0x200 /* dynamic variable */
1871 /* Need to be before varinit_data[] */
1872 #if ENABLE_LOCALE_SUPPORT
1873 static void FAST_FUNC
1874 change_lc_all(const char *value)
1876 if (value && *value != '\0')
1877 setlocale(LC_ALL, value);
1879 static void FAST_FUNC
1880 change_lc_ctype(const char *value)
1882 if (value && *value != '\0')
1883 setlocale(LC_CTYPE, value);
1887 static void chkmail(void);
1888 static void changemail(const char *var_value) FAST_FUNC;
1890 # define chkmail() ((void)0)
1892 static void changepath(const char *) FAST_FUNC;
1893 #if ENABLE_ASH_RANDOM_SUPPORT
1894 static void change_random(const char *) FAST_FUNC;
1897 static const struct {
1899 const char *var_text;
1900 void (*var_func)(const char *) FAST_FUNC;
1901 } varinit_data[] = {
1902 { VSTRFIXED|VTEXTFIXED , defifsvar , NULL },
1904 { VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL" , changemail },
1905 { VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH" , changemail },
1907 { VSTRFIXED|VTEXTFIXED , bb_PATH_root_path, changepath },
1908 { VSTRFIXED|VTEXTFIXED , "PS1=$ " , NULL },
1909 { VSTRFIXED|VTEXTFIXED , "PS2=> " , NULL },
1910 { VSTRFIXED|VTEXTFIXED , "PS4=+ " , NULL },
1911 #if ENABLE_ASH_GETOPTS
1912 { VSTRFIXED|VTEXTFIXED , "OPTIND=1" , getoptsreset },
1914 #if ENABLE_ASH_RANDOM_SUPPORT
1915 { VSTRFIXED|VTEXTFIXED|VUNSET|VDYNAMIC, "RANDOM", change_random },
1917 #if ENABLE_LOCALE_SUPPORT
1918 { VSTRFIXED|VTEXTFIXED|VUNSET, "LC_ALL" , change_lc_all },
1919 { VSTRFIXED|VTEXTFIXED|VUNSET, "LC_CTYPE" , change_lc_ctype },
1921 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
1922 { VSTRFIXED|VTEXTFIXED|VUNSET, "HISTFILE" , NULL },
1928 struct globals_var {
1929 struct shparam shellparam; /* $@ current positional parameters */
1930 struct redirtab *redirlist;
1932 int preverrout_fd; /* save fd2 before print debug if xflag is set. */
1933 struct var *vartab[VTABSIZE];
1934 struct var varinit[ARRAY_SIZE(varinit_data)];
1936 extern struct globals_var *const ash_ptr_to_globals_var;
1937 #define G_var (*ash_ptr_to_globals_var)
1938 #define shellparam (G_var.shellparam )
1939 //#define redirlist (G_var.redirlist )
1940 #define g_nullredirs (G_var.g_nullredirs )
1941 #define preverrout_fd (G_var.preverrout_fd)
1942 #define vartab (G_var.vartab )
1943 #define varinit (G_var.varinit )
1944 #define INIT_G_var() do { \
1946 (*(struct globals_var**)&ash_ptr_to_globals_var) = xzalloc(sizeof(G_var)); \
1948 for (i = 0; i < ARRAY_SIZE(varinit_data); i++) { \
1949 varinit[i].flags = varinit_data[i].flags; \
1950 varinit[i].var_text = varinit_data[i].var_text; \
1951 varinit[i].var_func = varinit_data[i].var_func; \
1955 #define vifs varinit[0]
1957 # define vmail (&vifs)[1]
1958 # define vmpath (&vmail)[1]
1959 # define vpath (&vmpath)[1]
1961 # define vpath (&vifs)[1]
1963 #define vps1 (&vpath)[1]
1964 #define vps2 (&vps1)[1]
1965 #define vps4 (&vps2)[1]
1966 #if ENABLE_ASH_GETOPTS
1967 # define voptind (&vps4)[1]
1968 # if ENABLE_ASH_RANDOM_SUPPORT
1969 # define vrandom (&voptind)[1]
1972 # if ENABLE_ASH_RANDOM_SUPPORT
1973 # define vrandom (&vps4)[1]
1978 * The following macros access the values of the above variables.
1979 * They have to skip over the name. They return the null string
1980 * for unset variables.
1982 #define ifsval() (vifs.var_text + 4)
1983 #define ifsset() ((vifs.flags & VUNSET) == 0)
1985 # define mailval() (vmail.var_text + 5)
1986 # define mpathval() (vmpath.var_text + 9)
1987 # define mpathset() ((vmpath.flags & VUNSET) == 0)
1989 #define pathval() (vpath.var_text + 5)
1990 #define ps1val() (vps1.var_text + 4)
1991 #define ps2val() (vps2.var_text + 4)
1992 #define ps4val() (vps4.var_text + 4)
1993 #if ENABLE_ASH_GETOPTS
1994 # define optindval() (voptind.var_text + 7)
1997 #if ENABLE_ASH_GETOPTS
1998 static void FAST_FUNC
1999 getoptsreset(const char *value)
2001 shellparam.optind = number(value);
2002 shellparam.optoff = -1;
2006 /* math.h has these, otherwise define our private copies */
2007 #if !ENABLE_SH_MATH_SUPPORT
2008 #define is_name(c) ((c) == '_' || isalpha((unsigned char)(c)))
2009 #define is_in_name(c) ((c) == '_' || isalnum((unsigned char)(c)))
2011 * Return the pointer to the first char which is not part of a legal variable name
2012 * (a letter or underscore followed by letters, underscores, and digits).
2015 endofname(const char *name)
2017 if (!is_name(*name))
2020 if (!is_in_name(*name))
2028 * Compares two strings up to the first = or '\0'. The first
2029 * string must be terminated by '='; the second may be terminated by
2030 * either '=' or '\0'.
2033 varcmp(const char *p, const char *q)
2037 while ((c = *p) == (d = *q)) {
2052 * Find the appropriate entry in the hash table from the name.
2054 static struct var **
2055 hashvar(const char *p)
2059 hashval = ((unsigned char) *p) << 4;
2060 while (*p && *p != '=')
2061 hashval += (unsigned char) *p++;
2062 return &vartab[hashval % VTABSIZE];
2066 vpcmp(const void *a, const void *b)
2068 return varcmp(*(const char **)a, *(const char **)b);
2072 * This routine initializes the builtin variables.
2082 * PS1 depends on uid
2084 #if ENABLE_FEATURE_EDITING && ENABLE_FEATURE_EDITING_FANCY_PROMPT
2085 vps1.var_text = "PS1=\\w \\$ ";
2088 vps1.var_text = "PS1=# ";
2091 end = vp + ARRAY_SIZE(varinit);
2093 vpp = hashvar(vp->var_text);
2096 } while (++vp < end);
2099 static struct var **
2100 findvar(struct var **vpp, const char *name)
2102 for (; *vpp; vpp = &(*vpp)->next) {
2103 if (varcmp((*vpp)->var_text, name) == 0) {
2111 * Find the value of a variable. Returns NULL if not set.
2113 static const char* FAST_FUNC
2114 lookupvar(const char *name)
2118 v = *findvar(hashvar(name), name);
2120 #if ENABLE_ASH_RANDOM_SUPPORT
2122 * Dynamic variables are implemented roughly the same way they are
2123 * in bash. Namely, they're "special" so long as they aren't unset.
2124 * As soon as they're unset, they're no longer dynamic, and dynamic
2125 * lookup will no longer happen at that point. -- PFM.
2127 if (v->flags & VDYNAMIC)
2130 if (!(v->flags & VUNSET))
2131 return var_end(v->var_text);
2137 * Search the environment of a builtin command.
2140 bltinlookup(const char *name)
2144 for (sp = cmdenviron; sp; sp = sp->next) {
2145 if (varcmp(sp->text, name) == 0)
2146 return var_end(sp->text);
2148 return lookupvar(name);
2152 * Same as setvar except that the variable and value are passed in
2153 * the first argument as name=value. Since the first argument will
2154 * be actually stored in the table, it should not be a string that
2156 * Called with interrupts off.
2159 setvareq(char *s, int flags)
2161 struct var *vp, **vpp;
2164 flags |= (VEXPORT & (((unsigned) (1 - aflag)) - 1));
2165 vp = *findvar(vpp, s);
2167 if ((vp->flags & (VREADONLY|VDYNAMIC)) == VREADONLY) {
2170 if (flags & VNOSAVE)
2173 ash_msg_and_raise_error("%.*s: is read only", strchrnul(n, '=') - n, n);
2179 if (vp->var_func && !(flags & VNOFUNC))
2180 vp->var_func(var_end(s));
2182 if (!(vp->flags & (VTEXTFIXED|VSTACK)))
2183 free((char*)vp->var_text);
2185 flags |= vp->flags & ~(VTEXTFIXED|VSTACK|VNOSAVE|VUNSET);
2187 /* variable s is not found */
2190 vp = ckzalloc(sizeof(*vp));
2192 /*vp->func = NULL; - ckzalloc did it */
2195 if (!(flags & (VTEXTFIXED|VSTACK|VNOSAVE)))
2202 * Set the value of a variable. The flags argument is ored with the
2203 * flags of the variable. If val is NULL, the variable is unset.
2206 setvar(const char *name, const char *val, int flags)
2214 q = endofname(name);
2215 p = strchrnul(q, '=');
2217 if (!namelen || p != q)
2218 ash_msg_and_raise_error("%.*s: bad variable name", namelen, name);
2223 vallen = strlen(val);
2227 nameeq = ckmalloc(namelen + vallen + 2);
2228 p = memcpy(nameeq, name, namelen) + namelen;
2231 p = memcpy(p, val, vallen) + vallen;
2234 setvareq(nameeq, flags | VNOSAVE);
2238 static void FAST_FUNC
2239 setvar2(const char *name, const char *val)
2241 setvar(name, val, 0);
2244 #if ENABLE_ASH_GETOPTS
2246 * Safe version of setvar, returns 1 on success 0 on failure.
2249 setvarsafe(const char *name, const char *val, int flags)
2252 volatile int saveint;
2253 struct jmploc *volatile savehandler = exception_handler;
2254 struct jmploc jmploc;
2257 if (setjmp(jmploc.loc))
2260 exception_handler = &jmploc;
2261 setvar(name, val, flags);
2264 exception_handler = savehandler;
2265 RESTORE_INT(saveint);
2271 * Unset the specified variable.
2274 unsetvar(const char *s)
2280 vpp = findvar(hashvar(s), s);
2284 int flags = vp->flags;
2287 if (flags & VREADONLY)
2289 #if ENABLE_ASH_RANDOM_SUPPORT
2290 vp->flags &= ~VDYNAMIC;
2294 if ((flags & VSTRFIXED) == 0) {
2296 if ((flags & (VTEXTFIXED|VSTACK)) == 0)
2297 free((char*)vp->var_text);
2303 vp->flags &= ~VEXPORT;
2313 * Process a linked list of variable assignments.
2316 listsetvar(struct strlist *list_set_var, int flags)
2318 struct strlist *lp = list_set_var;
2324 setvareq(lp->text, flags);
2331 * Generate a list of variables satisfying the given conditions.
2334 listvars(int on, int off, char ***end)
2345 for (vp = *vpp; vp; vp = vp->next) {
2346 if ((vp->flags & mask) == on) {
2347 if (ep == stackstrend())
2348 ep = growstackstr();
2349 *ep++ = (char*)vp->var_text;
2352 } while (++vpp < vartab + VTABSIZE);
2353 if (ep == stackstrend())
2354 ep = growstackstr();
2358 return grabstackstr(ep);
2362 /* ============ Path search helper
2364 * The variable path (passed by reference) should be set to the start
2365 * of the path before the first call; path_advance will update
2366 * this value as it proceeds. Successive calls to path_advance will return
2367 * the possible path expansions in sequence. If an option (indicated by
2368 * a percent sign) appears in the path entry then the global variable
2369 * pathopt will be set to point to it; otherwise pathopt will be set to
2372 static const char *pathopt; /* set by path_advance */
2375 path_advance(const char **path, const char *name)
2385 for (p = start; *p && *p != ':' && *p != '%'; p++)
2387 len = p - start + strlen(name) + 2; /* "2" is for '/' and '\0' */
2388 while (stackblocksize() < len)
2392 memcpy(q, start, p - start);
2400 while (*p && *p != ':')
2407 return stalloc(len);
2411 /* ============ Prompt */
2413 static smallint doprompt; /* if set, prompt the user */
2414 static smallint needprompt; /* true if interactive and at start of line */
2416 #if ENABLE_FEATURE_EDITING
2417 static line_input_t *line_input_state;
2418 static const char *cmdedit_prompt;
2420 putprompt(const char *s)
2422 if (ENABLE_ASH_EXPAND_PRMT) {
2423 free((char*)cmdedit_prompt);
2424 cmdedit_prompt = ckstrdup(s);
2431 putprompt(const char *s)
2437 #if ENABLE_ASH_EXPAND_PRMT
2438 /* expandstr() needs parsing machinery, so it is far away ahead... */
2439 static const char *expandstr(const char *ps);
2441 #define expandstr(s) s
2445 setprompt_if(smallint do_set, int whichprompt)
2448 IF_ASH_EXPAND_PRMT(struct stackmark smark;)
2455 switch (whichprompt) {
2465 #if ENABLE_ASH_EXPAND_PRMT
2466 setstackmark(&smark);
2467 stalloc(stackblocksize());
2469 putprompt(expandstr(prompt));
2470 #if ENABLE_ASH_EXPAND_PRMT
2471 popstackmark(&smark);
2476 /* ============ The cd and pwd commands */
2478 #define CD_PHYSICAL 1
2488 while ((i = nextopt("LP")) != '\0') {
2490 flags ^= CD_PHYSICAL;
2499 * Update curdir (the name of the current directory) in response to a
2503 updatepwd(const char *dir)
2510 cdcomppath = ststrdup(dir);
2513 if (curdir == nullstr)
2515 new = stack_putstr(curdir, new);
2517 new = makestrspace(strlen(dir) + 2, new);
2518 lim = (char *)stackblock() + 1;
2522 if (new > lim && *lim == '/')
2527 if (dir[1] == '/' && dir[2] != '/') {
2533 p = strtok(cdcomppath, "/");
2537 if (p[1] == '.' && p[2] == '\0') {
2549 new = stack_putstr(p, new);
2557 return stackblock();
2561 * Find out what the current directory is. If we already know the current
2562 * directory, this routine returns immediately.
2567 char *dir = getcwd(NULL, 0); /* huh, using glibc extension? */
2568 return dir ? dir : nullstr;
2572 setpwd(const char *val, int setold)
2576 oldcur = dir = curdir;
2579 setvar("OLDPWD", oldcur, VEXPORT);
2582 if (physdir != nullstr) {
2583 if (physdir != oldcur)
2587 if (oldcur == val || !val) {
2593 dir = ckstrdup(val);
2594 if (oldcur != dir && oldcur != nullstr) {
2599 setvar("PWD", dir, VEXPORT);
2602 static void hashcd(void);
2605 * Actually do the chdir. We also call hashcd to let the routines in exec.c
2606 * know that the current directory has changed.
2609 docd(const char *dest, int flags)
2611 const char *dir = NULL;
2614 TRACE(("docd(\"%s\", %d) called\n", dest, flags));
2617 if (!(flags & CD_PHYSICAL)) {
2618 dir = updatepwd(dest);
2632 static int FAST_FUNC
2633 cdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
2645 dest = bltinlookup("HOME");
2646 else if (LONE_DASH(dest)) {
2647 dest = bltinlookup("OLDPWD");
2669 path = bltinlookup("CDPATH");
2678 p = path_advance(&path, dest);
2679 if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
2683 if (!docd(p, flags))
2688 ash_msg_and_raise_error("can't cd to %s", dest);
2691 if (flags & CD_PRINT)
2692 out1fmt("%s\n", curdir);
2696 static int FAST_FUNC
2697 pwdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
2700 const char *dir = curdir;
2704 if (physdir == nullstr)
2708 out1fmt("%s\n", dir);
2713 /* ============ ... */
2716 #define IBUFSIZ (ENABLE_FEATURE_EDITING ? CONFIG_FEATURE_EDITING_MAX_LEN : 1024)
2718 /* Syntax classes */
2719 #define CWORD 0 /* character is nothing special */
2720 #define CNL 1 /* newline character */
2721 #define CBACK 2 /* a backslash character */
2722 #define CSQUOTE 3 /* single quote */
2723 #define CDQUOTE 4 /* double quote */
2724 #define CENDQUOTE 5 /* a terminating quote */
2725 #define CBQUOTE 6 /* backwards single quote */
2726 #define CVAR 7 /* a dollar sign */
2727 #define CENDVAR 8 /* a '}' character */
2728 #define CLP 9 /* a left paren in arithmetic */
2729 #define CRP 10 /* a right paren in arithmetic */
2730 #define CENDFILE 11 /* end of file */
2731 #define CCTL 12 /* like CWORD, except it must be escaped */
2732 #define CSPCL 13 /* these terminate a word */
2733 #define CIGN 14 /* character should be ignored */
2736 #if ENABLE_ASH_ALIAS
2740 #define USE_SIT_FUNCTION ENABLE_ASH_OPTIMIZE_FOR_SIZE
2742 #if ENABLE_SH_MATH_SUPPORT
2743 # define SIT_ITEM(a,b,c,d) (a | (b << 4) | (c << 8) | (d << 12))
2745 # define SIT_ITEM(a,b,c,d) (a | (b << 4) | (c << 8))
2747 static const uint16_t S_I_T[] = {
2748 #if ENABLE_ASH_ALIAS
2749 SIT_ITEM(CSPCL , CIGN , CIGN , CIGN ), /* 0, PEOA */
2751 SIT_ITEM(CSPCL , CWORD , CWORD, CWORD ), /* 1, ' ' */
2752 SIT_ITEM(CNL , CNL , CNL , CNL ), /* 2, \n */
2753 SIT_ITEM(CWORD , CCTL , CCTL , CWORD ), /* 3, !*-/:=?[]~ */
2754 SIT_ITEM(CDQUOTE , CENDQUOTE, CWORD, CWORD ), /* 4, '"' */
2755 SIT_ITEM(CVAR , CVAR , CWORD, CVAR ), /* 5, $ */
2756 SIT_ITEM(CSQUOTE , CWORD , CENDQUOTE, CWORD), /* 6, "'" */
2757 SIT_ITEM(CSPCL , CWORD , CWORD, CLP ), /* 7, ( */
2758 SIT_ITEM(CSPCL , CWORD , CWORD, CRP ), /* 8, ) */
2759 SIT_ITEM(CBACK , CBACK , CCTL , CBACK ), /* 9, \ */
2760 SIT_ITEM(CBQUOTE , CBQUOTE , CWORD, CBQUOTE), /* 10, ` */
2761 SIT_ITEM(CENDVAR , CENDVAR , CWORD, CENDVAR), /* 11, } */
2762 #if !USE_SIT_FUNCTION
2763 SIT_ITEM(CENDFILE, CENDFILE , CENDFILE, CENDFILE),/* 12, PEOF */
2764 SIT_ITEM(CWORD , CWORD , CWORD, CWORD ), /* 13, 0-9A-Za-z */
2765 SIT_ITEM(CCTL , CCTL , CCTL , CCTL ) /* 14, CTLESC ... */
2769 /* Constants below must match table above */
2771 #if ENABLE_ASH_ALIAS
2772 CSPCL_CIGN_CIGN_CIGN , /* 0 */
2774 CSPCL_CWORD_CWORD_CWORD , /* 1 */
2775 CNL_CNL_CNL_CNL , /* 2 */
2776 CWORD_CCTL_CCTL_CWORD , /* 3 */
2777 CDQUOTE_CENDQUOTE_CWORD_CWORD , /* 4 */
2778 CVAR_CVAR_CWORD_CVAR , /* 5 */
2779 CSQUOTE_CWORD_CENDQUOTE_CWORD , /* 6 */
2780 CSPCL_CWORD_CWORD_CLP , /* 7 */
2781 CSPCL_CWORD_CWORD_CRP , /* 8 */
2782 CBACK_CBACK_CCTL_CBACK , /* 9 */
2783 CBQUOTE_CBQUOTE_CWORD_CBQUOTE , /* 10 */
2784 CENDVAR_CENDVAR_CWORD_CENDVAR , /* 11 */
2785 CENDFILE_CENDFILE_CENDFILE_CENDFILE, /* 12 */
2786 CWORD_CWORD_CWORD_CWORD , /* 13 */
2787 CCTL_CCTL_CCTL_CCTL , /* 14 */
2790 /* c in SIT(c, syntax) must be an *unsigned char* or PEOA or PEOF,
2791 * caller must ensure proper cast on it if c is *char_ptr!
2793 /* Values for syntax param */
2794 #define BASESYNTAX 0 /* not in quotes */
2795 #define DQSYNTAX 1 /* in double quotes */
2796 #define SQSYNTAX 2 /* in single quotes */
2797 #define ARISYNTAX 3 /* in arithmetic */
2798 #define PSSYNTAX 4 /* prompt. never passed to SIT() */
2800 #if USE_SIT_FUNCTION
2803 SIT(int c, int syntax)
2805 static const char spec_symbls[] ALIGN1 = "\t\n !\"$&'()*-/:;<=>?[\\]`|}~";
2806 # if ENABLE_ASH_ALIAS
2807 static const uint8_t syntax_index_table[] ALIGN1 = {
2808 1, 2, 1, 3, 4, 5, 1, 6, /* "\t\n !\"$&'" */
2809 7, 8, 3, 3, 3, 3, 1, 1, /* "()*-/:;<" */
2810 3, 1, 3, 3, 9, 3, 10, 1, /* "=>?[\\]`|" */
2814 static const uint8_t syntax_index_table[] ALIGN1 = {
2815 0, 1, 0, 2, 3, 4, 0, 5, /* "\t\n !\"$&'" */
2816 6, 7, 2, 2, 2, 2, 0, 0, /* "()*-/:;<" */
2817 2, 0, 2, 2, 8, 2, 9, 0, /* "=>?[\\]`|" */
2826 # if ENABLE_ASH_ALIAS
2832 /* Cast is purely for paranoia here,
2833 * just in case someone passed signed char to us */
2834 if ((unsigned char)c >= CTL_FIRST
2835 && (unsigned char)c <= CTL_LAST
2839 s = strchrnul(spec_symbls, c);
2842 indx = syntax_index_table[s - spec_symbls];
2844 return (S_I_T[indx] >> (syntax*4)) & 0xf;
2847 #else /* !USE_SIT_FUNCTION */
2849 static const uint8_t syntax_index_table[] = {
2850 /* BASESYNTAX_DQSYNTAX_SQSYNTAX_ARISYNTAX */
2851 /* 0 */ CWORD_CWORD_CWORD_CWORD,
2852 /* 1 */ CWORD_CWORD_CWORD_CWORD,
2853 /* 2 */ CWORD_CWORD_CWORD_CWORD,
2854 /* 3 */ CWORD_CWORD_CWORD_CWORD,
2855 /* 4 */ CWORD_CWORD_CWORD_CWORD,
2856 /* 5 */ CWORD_CWORD_CWORD_CWORD,
2857 /* 6 */ CWORD_CWORD_CWORD_CWORD,
2858 /* 7 */ CWORD_CWORD_CWORD_CWORD,
2859 /* 8 */ CWORD_CWORD_CWORD_CWORD,
2860 /* 9 "\t" */ CSPCL_CWORD_CWORD_CWORD,
2861 /* 10 "\n" */ CNL_CNL_CNL_CNL,
2862 /* 11 */ CWORD_CWORD_CWORD_CWORD,
2863 /* 12 */ CWORD_CWORD_CWORD_CWORD,
2864 /* 13 */ CWORD_CWORD_CWORD_CWORD,
2865 /* 14 */ CWORD_CWORD_CWORD_CWORD,
2866 /* 15 */ CWORD_CWORD_CWORD_CWORD,
2867 /* 16 */ CWORD_CWORD_CWORD_CWORD,
2868 /* 17 */ CWORD_CWORD_CWORD_CWORD,
2869 /* 18 */ CWORD_CWORD_CWORD_CWORD,
2870 /* 19 */ CWORD_CWORD_CWORD_CWORD,
2871 /* 20 */ CWORD_CWORD_CWORD_CWORD,
2872 /* 21 */ CWORD_CWORD_CWORD_CWORD,
2873 /* 22 */ CWORD_CWORD_CWORD_CWORD,
2874 /* 23 */ CWORD_CWORD_CWORD_CWORD,
2875 /* 24 */ CWORD_CWORD_CWORD_CWORD,
2876 /* 25 */ CWORD_CWORD_CWORD_CWORD,
2877 /* 26 */ CWORD_CWORD_CWORD_CWORD,
2878 /* 27 */ CWORD_CWORD_CWORD_CWORD,
2879 /* 28 */ CWORD_CWORD_CWORD_CWORD,
2880 /* 29 */ CWORD_CWORD_CWORD_CWORD,
2881 /* 30 */ CWORD_CWORD_CWORD_CWORD,
2882 /* 31 */ CWORD_CWORD_CWORD_CWORD,
2883 /* 32 " " */ CSPCL_CWORD_CWORD_CWORD,
2884 /* 33 "!" */ CWORD_CCTL_CCTL_CWORD,
2885 /* 34 """ */ CDQUOTE_CENDQUOTE_CWORD_CWORD,
2886 /* 35 "#" */ CWORD_CWORD_CWORD_CWORD,
2887 /* 36 "$" */ CVAR_CVAR_CWORD_CVAR,
2888 /* 37 "%" */ CWORD_CWORD_CWORD_CWORD,
2889 /* 38 "&" */ CSPCL_CWORD_CWORD_CWORD,
2890 /* 39 "'" */ CSQUOTE_CWORD_CENDQUOTE_CWORD,
2891 /* 40 "(" */ CSPCL_CWORD_CWORD_CLP,
2892 /* 41 ")" */ CSPCL_CWORD_CWORD_CRP,
2893 /* 42 "*" */ CWORD_CCTL_CCTL_CWORD,
2894 /* 43 "+" */ CWORD_CWORD_CWORD_CWORD,
2895 /* 44 "," */ CWORD_CWORD_CWORD_CWORD,
2896 /* 45 "-" */ CWORD_CCTL_CCTL_CWORD,
2897 /* 46 "." */ CWORD_CWORD_CWORD_CWORD,
2898 /* 47 "/" */ CWORD_CCTL_CCTL_CWORD,
2899 /* 48 "0" */ CWORD_CWORD_CWORD_CWORD,
2900 /* 49 "1" */ CWORD_CWORD_CWORD_CWORD,
2901 /* 50 "2" */ CWORD_CWORD_CWORD_CWORD,
2902 /* 51 "3" */ CWORD_CWORD_CWORD_CWORD,
2903 /* 52 "4" */ CWORD_CWORD_CWORD_CWORD,
2904 /* 53 "5" */ CWORD_CWORD_CWORD_CWORD,
2905 /* 54 "6" */ CWORD_CWORD_CWORD_CWORD,
2906 /* 55 "7" */ CWORD_CWORD_CWORD_CWORD,
2907 /* 56 "8" */ CWORD_CWORD_CWORD_CWORD,
2908 /* 57 "9" */ CWORD_CWORD_CWORD_CWORD,
2909 /* 58 ":" */ CWORD_CCTL_CCTL_CWORD,
2910 /* 59 ";" */ CSPCL_CWORD_CWORD_CWORD,
2911 /* 60 "<" */ CSPCL_CWORD_CWORD_CWORD,
2912 /* 61 "=" */ CWORD_CCTL_CCTL_CWORD,
2913 /* 62 ">" */ CSPCL_CWORD_CWORD_CWORD,
2914 /* 63 "?" */ CWORD_CCTL_CCTL_CWORD,
2915 /* 64 "@" */ CWORD_CWORD_CWORD_CWORD,
2916 /* 65 "A" */ CWORD_CWORD_CWORD_CWORD,
2917 /* 66 "B" */ CWORD_CWORD_CWORD_CWORD,
2918 /* 67 "C" */ CWORD_CWORD_CWORD_CWORD,
2919 /* 68 "D" */ CWORD_CWORD_CWORD_CWORD,
2920 /* 69 "E" */ CWORD_CWORD_CWORD_CWORD,
2921 /* 70 "F" */ CWORD_CWORD_CWORD_CWORD,
2922 /* 71 "G" */ CWORD_CWORD_CWORD_CWORD,
2923 /* 72 "H" */ CWORD_CWORD_CWORD_CWORD,
2924 /* 73 "I" */ CWORD_CWORD_CWORD_CWORD,
2925 /* 74 "J" */ CWORD_CWORD_CWORD_CWORD,
2926 /* 75 "K" */ CWORD_CWORD_CWORD_CWORD,
2927 /* 76 "L" */ CWORD_CWORD_CWORD_CWORD,
2928 /* 77 "M" */ CWORD_CWORD_CWORD_CWORD,
2929 /* 78 "N" */ CWORD_CWORD_CWORD_CWORD,
2930 /* 79 "O" */ CWORD_CWORD_CWORD_CWORD,
2931 /* 80 "P" */ CWORD_CWORD_CWORD_CWORD,
2932 /* 81 "Q" */ CWORD_CWORD_CWORD_CWORD,
2933 /* 82 "R" */ CWORD_CWORD_CWORD_CWORD,
2934 /* 83 "S" */ CWORD_CWORD_CWORD_CWORD,
2935 /* 84 "T" */ CWORD_CWORD_CWORD_CWORD,
2936 /* 85 "U" */ CWORD_CWORD_CWORD_CWORD,
2937 /* 86 "V" */ CWORD_CWORD_CWORD_CWORD,
2938 /* 87 "W" */ CWORD_CWORD_CWORD_CWORD,
2939 /* 88 "X" */ CWORD_CWORD_CWORD_CWORD,
2940 /* 89 "Y" */ CWORD_CWORD_CWORD_CWORD,
2941 /* 90 "Z" */ CWORD_CWORD_CWORD_CWORD,
2942 /* 91 "[" */ CWORD_CCTL_CCTL_CWORD,
2943 /* 92 "\" */ CBACK_CBACK_CCTL_CBACK,
2944 /* 93 "]" */ CWORD_CCTL_CCTL_CWORD,
2945 /* 94 "^" */ CWORD_CWORD_CWORD_CWORD,
2946 /* 95 "_" */ CWORD_CWORD_CWORD_CWORD,
2947 /* 96 "`" */ CBQUOTE_CBQUOTE_CWORD_CBQUOTE,
2948 /* 97 "a" */ CWORD_CWORD_CWORD_CWORD,
2949 /* 98 "b" */ CWORD_CWORD_CWORD_CWORD,
2950 /* 99 "c" */ CWORD_CWORD_CWORD_CWORD,
2951 /* 100 "d" */ CWORD_CWORD_CWORD_CWORD,
2952 /* 101 "e" */ CWORD_CWORD_CWORD_CWORD,
2953 /* 102 "f" */ CWORD_CWORD_CWORD_CWORD,
2954 /* 103 "g" */ CWORD_CWORD_CWORD_CWORD,
2955 /* 104 "h" */ CWORD_CWORD_CWORD_CWORD,
2956 /* 105 "i" */ CWORD_CWORD_CWORD_CWORD,
2957 /* 106 "j" */ CWORD_CWORD_CWORD_CWORD,
2958 /* 107 "k" */ CWORD_CWORD_CWORD_CWORD,
2959 /* 108 "l" */ CWORD_CWORD_CWORD_CWORD,
2960 /* 109 "m" */ CWORD_CWORD_CWORD_CWORD,
2961 /* 110 "n" */ CWORD_CWORD_CWORD_CWORD,
2962 /* 111 "o" */ CWORD_CWORD_CWORD_CWORD,
2963 /* 112 "p" */ CWORD_CWORD_CWORD_CWORD,
2964 /* 113 "q" */ CWORD_CWORD_CWORD_CWORD,
2965 /* 114 "r" */ CWORD_CWORD_CWORD_CWORD,
2966 /* 115 "s" */ CWORD_CWORD_CWORD_CWORD,
2967 /* 116 "t" */ CWORD_CWORD_CWORD_CWORD,
2968 /* 117 "u" */ CWORD_CWORD_CWORD_CWORD,
2969 /* 118 "v" */ CWORD_CWORD_CWORD_CWORD,
2970 /* 119 "w" */ CWORD_CWORD_CWORD_CWORD,
2971 /* 120 "x" */ CWORD_CWORD_CWORD_CWORD,
2972 /* 121 "y" */ CWORD_CWORD_CWORD_CWORD,
2973 /* 122 "z" */ CWORD_CWORD_CWORD_CWORD,
2974 /* 123 "{" */ CWORD_CWORD_CWORD_CWORD,
2975 /* 124 "|" */ CSPCL_CWORD_CWORD_CWORD,
2976 /* 125 "}" */ CENDVAR_CENDVAR_CWORD_CENDVAR,
2977 /* 126 "~" */ CWORD_CCTL_CCTL_CWORD,
2978 /* 127 del */ CWORD_CWORD_CWORD_CWORD,
2979 /* 128 0x80 */ CWORD_CWORD_CWORD_CWORD,
2980 /* 129 CTLESC */ CCTL_CCTL_CCTL_CCTL,
2981 /* 130 CTLVAR */ CCTL_CCTL_CCTL_CCTL,
2982 /* 131 CTLENDVAR */ CCTL_CCTL_CCTL_CCTL,
2983 /* 132 CTLBACKQ */ CCTL_CCTL_CCTL_CCTL,
2984 /* 133 CTLQUOTE */ CCTL_CCTL_CCTL_CCTL,
2985 /* 134 CTLARI */ CCTL_CCTL_CCTL_CCTL,
2986 /* 135 CTLENDARI */ CCTL_CCTL_CCTL_CCTL,
2987 /* 136 CTLQUOTEMARK */ CCTL_CCTL_CCTL_CCTL,
2988 /* 137 */ CWORD_CWORD_CWORD_CWORD,
2989 /* 138 */ CWORD_CWORD_CWORD_CWORD,
2990 /* 139 */ CWORD_CWORD_CWORD_CWORD,
2991 /* 140 */ CWORD_CWORD_CWORD_CWORD,
2992 /* 141 */ CWORD_CWORD_CWORD_CWORD,
2993 /* 142 */ CWORD_CWORD_CWORD_CWORD,
2994 /* 143 */ CWORD_CWORD_CWORD_CWORD,
2995 /* 144 */ CWORD_CWORD_CWORD_CWORD,
2996 /* 145 */ CWORD_CWORD_CWORD_CWORD,
2997 /* 146 */ CWORD_CWORD_CWORD_CWORD,
2998 /* 147 */ CWORD_CWORD_CWORD_CWORD,
2999 /* 148 */ CWORD_CWORD_CWORD_CWORD,
3000 /* 149 */ CWORD_CWORD_CWORD_CWORD,
3001 /* 150 */ CWORD_CWORD_CWORD_CWORD,
3002 /* 151 */ CWORD_CWORD_CWORD_CWORD,
3003 /* 152 */ CWORD_CWORD_CWORD_CWORD,
3004 /* 153 */ CWORD_CWORD_CWORD_CWORD,
3005 /* 154 */ CWORD_CWORD_CWORD_CWORD,
3006 /* 155 */ CWORD_CWORD_CWORD_CWORD,
3007 /* 156 */ CWORD_CWORD_CWORD_CWORD,
3008 /* 157 */ CWORD_CWORD_CWORD_CWORD,
3009 /* 158 */ CWORD_CWORD_CWORD_CWORD,
3010 /* 159 */ CWORD_CWORD_CWORD_CWORD,
3011 /* 160 */ CWORD_CWORD_CWORD_CWORD,
3012 /* 161 */ CWORD_CWORD_CWORD_CWORD,
3013 /* 162 */ CWORD_CWORD_CWORD_CWORD,
3014 /* 163 */ CWORD_CWORD_CWORD_CWORD,
3015 /* 164 */ CWORD_CWORD_CWORD_CWORD,
3016 /* 165 */ CWORD_CWORD_CWORD_CWORD,
3017 /* 166 */ CWORD_CWORD_CWORD_CWORD,
3018 /* 167 */ CWORD_CWORD_CWORD_CWORD,
3019 /* 168 */ CWORD_CWORD_CWORD_CWORD,
3020 /* 169 */ CWORD_CWORD_CWORD_CWORD,
3021 /* 170 */ CWORD_CWORD_CWORD_CWORD,
3022 /* 171 */ CWORD_CWORD_CWORD_CWORD,
3023 /* 172 */ CWORD_CWORD_CWORD_CWORD,
3024 /* 173 */ CWORD_CWORD_CWORD_CWORD,
3025 /* 174 */ CWORD_CWORD_CWORD_CWORD,
3026 /* 175 */ CWORD_CWORD_CWORD_CWORD,
3027 /* 176 */ CWORD_CWORD_CWORD_CWORD,
3028 /* 177 */ CWORD_CWORD_CWORD_CWORD,
3029 /* 178 */ CWORD_CWORD_CWORD_CWORD,
3030 /* 179 */ CWORD_CWORD_CWORD_CWORD,
3031 /* 180 */ CWORD_CWORD_CWORD_CWORD,
3032 /* 181 */ CWORD_CWORD_CWORD_CWORD,
3033 /* 182 */ CWORD_CWORD_CWORD_CWORD,
3034 /* 183 */ CWORD_CWORD_CWORD_CWORD,
3035 /* 184 */ CWORD_CWORD_CWORD_CWORD,
3036 /* 185 */ CWORD_CWORD_CWORD_CWORD,
3037 /* 186 */ CWORD_CWORD_CWORD_CWORD,
3038 /* 187 */ CWORD_CWORD_CWORD_CWORD,
3039 /* 188 */ CWORD_CWORD_CWORD_CWORD,
3040 /* 189 */ CWORD_CWORD_CWORD_CWORD,
3041 /* 190 */ CWORD_CWORD_CWORD_CWORD,
3042 /* 191 */ CWORD_CWORD_CWORD_CWORD,
3043 /* 192 */ CWORD_CWORD_CWORD_CWORD,
3044 /* 193 */ CWORD_CWORD_CWORD_CWORD,
3045 /* 194 */ CWORD_CWORD_CWORD_CWORD,
3046 /* 195 */ CWORD_CWORD_CWORD_CWORD,
3047 /* 196 */ CWORD_CWORD_CWORD_CWORD,
3048 /* 197 */ CWORD_CWORD_CWORD_CWORD,
3049 /* 198 */ CWORD_CWORD_CWORD_CWORD,
3050 /* 199 */ CWORD_CWORD_CWORD_CWORD,
3051 /* 200 */ CWORD_CWORD_CWORD_CWORD,
3052 /* 201 */ CWORD_CWORD_CWORD_CWORD,
3053 /* 202 */ CWORD_CWORD_CWORD_CWORD,
3054 /* 203 */ CWORD_CWORD_CWORD_CWORD,
3055 /* 204 */ CWORD_CWORD_CWORD_CWORD,
3056 /* 205 */ CWORD_CWORD_CWORD_CWORD,
3057 /* 206 */ CWORD_CWORD_CWORD_CWORD,
3058 /* 207 */ CWORD_CWORD_CWORD_CWORD,
3059 /* 208 */ CWORD_CWORD_CWORD_CWORD,
3060 /* 209 */ CWORD_CWORD_CWORD_CWORD,
3061 /* 210 */ CWORD_CWORD_CWORD_CWORD,
3062 /* 211 */ CWORD_CWORD_CWORD_CWORD,
3063 /* 212 */ CWORD_CWORD_CWORD_CWORD,
3064 /* 213 */ CWORD_CWORD_CWORD_CWORD,
3065 /* 214 */ CWORD_CWORD_CWORD_CWORD,
3066 /* 215 */ CWORD_CWORD_CWORD_CWORD,
3067 /* 216 */ CWORD_CWORD_CWORD_CWORD,
3068 /* 217 */ CWORD_CWORD_CWORD_CWORD,
3069 /* 218 */ CWORD_CWORD_CWORD_CWORD,
3070 /* 219 */ CWORD_CWORD_CWORD_CWORD,
3071 /* 220 */ CWORD_CWORD_CWORD_CWORD,
3072 /* 221 */ CWORD_CWORD_CWORD_CWORD,
3073 /* 222 */ CWORD_CWORD_CWORD_CWORD,
3074 /* 223 */ CWORD_CWORD_CWORD_CWORD,
3075 /* 224 */ CWORD_CWORD_CWORD_CWORD,
3076 /* 225 */ CWORD_CWORD_CWORD_CWORD,
3077 /* 226 */ CWORD_CWORD_CWORD_CWORD,
3078 /* 227 */ CWORD_CWORD_CWORD_CWORD,
3079 /* 228 */ CWORD_CWORD_CWORD_CWORD,
3080 /* 229 */ CWORD_CWORD_CWORD_CWORD,
3081 /* 230 */ CWORD_CWORD_CWORD_CWORD,
3082 /* 231 */ CWORD_CWORD_CWORD_CWORD,
3083 /* 232 */ CWORD_CWORD_CWORD_CWORD,
3084 /* 233 */ CWORD_CWORD_CWORD_CWORD,
3085 /* 234 */ CWORD_CWORD_CWORD_CWORD,
3086 /* 235 */ CWORD_CWORD_CWORD_CWORD,
3087 /* 236 */ CWORD_CWORD_CWORD_CWORD,
3088 /* 237 */ CWORD_CWORD_CWORD_CWORD,
3089 /* 238 */ CWORD_CWORD_CWORD_CWORD,
3090 /* 239 */ CWORD_CWORD_CWORD_CWORD,
3091 /* 230 */ CWORD_CWORD_CWORD_CWORD,
3092 /* 241 */ CWORD_CWORD_CWORD_CWORD,
3093 /* 242 */ CWORD_CWORD_CWORD_CWORD,
3094 /* 243 */ CWORD_CWORD_CWORD_CWORD,
3095 /* 244 */ CWORD_CWORD_CWORD_CWORD,
3096 /* 245 */ CWORD_CWORD_CWORD_CWORD,
3097 /* 246 */ CWORD_CWORD_CWORD_CWORD,
3098 /* 247 */ CWORD_CWORD_CWORD_CWORD,
3099 /* 248 */ CWORD_CWORD_CWORD_CWORD,
3100 /* 249 */ CWORD_CWORD_CWORD_CWORD,
3101 /* 250 */ CWORD_CWORD_CWORD_CWORD,
3102 /* 251 */ CWORD_CWORD_CWORD_CWORD,
3103 /* 252 */ CWORD_CWORD_CWORD_CWORD,
3104 /* 253 */ CWORD_CWORD_CWORD_CWORD,
3105 /* 254 */ CWORD_CWORD_CWORD_CWORD,
3106 /* 255 */ CWORD_CWORD_CWORD_CWORD,
3107 /* PEOF */ CENDFILE_CENDFILE_CENDFILE_CENDFILE,
3108 # if ENABLE_ASH_ALIAS
3109 /* PEOA */ CSPCL_CIGN_CIGN_CIGN,
3113 # define SIT(c, syntax) ((S_I_T[syntax_index_table[c]] >> ((syntax)*4)) & 0xf)
3115 #endif /* !USE_SIT_FUNCTION */
3118 /* ============ Alias handling */
3120 #if ENABLE_ASH_ALIAS
3122 #define ALIASINUSE 1
3133 static struct alias **atab; // [ATABSIZE];
3134 #define INIT_G_alias() do { \
3135 atab = xzalloc(ATABSIZE * sizeof(atab[0])); \
3139 static struct alias **
3140 __lookupalias(const char *name) {
3141 unsigned int hashval;
3148 ch = (unsigned char)*p;
3152 ch = (unsigned char)*++p;
3154 app = &atab[hashval % ATABSIZE];
3156 for (; *app; app = &(*app)->next) {
3157 if (strcmp(name, (*app)->name) == 0) {
3165 static struct alias *
3166 lookupalias(const char *name, int check)
3168 struct alias *ap = *__lookupalias(name);
3170 if (check && ap && (ap->flag & ALIASINUSE))
3175 static struct alias *
3176 freealias(struct alias *ap)
3180 if (ap->flag & ALIASINUSE) {
3181 ap->flag |= ALIASDEAD;
3193 setalias(const char *name, const char *val)
3195 struct alias *ap, **app;
3197 app = __lookupalias(name);
3201 if (!(ap->flag & ALIASINUSE)) {
3204 ap->val = ckstrdup(val);
3205 ap->flag &= ~ALIASDEAD;
3208 ap = ckzalloc(sizeof(struct alias));
3209 ap->name = ckstrdup(name);
3210 ap->val = ckstrdup(val);
3211 /*ap->flag = 0; - ckzalloc did it */
3212 /*ap->next = NULL;*/
3219 unalias(const char *name)
3223 app = __lookupalias(name);
3227 *app = freealias(*app);
3238 struct alias *ap, **app;
3242 for (i = 0; i < ATABSIZE; i++) {
3244 for (ap = *app; ap; ap = *app) {
3245 *app = freealias(*app);
3255 printalias(const struct alias *ap)
3257 out1fmt("%s=%s\n", ap->name, single_quote(ap->val));
3261 * TODO - sort output
3263 static int FAST_FUNC
3264 aliascmd(int argc UNUSED_PARAM, char **argv)
3273 for (i = 0; i < ATABSIZE; i++) {
3274 for (ap = atab[i]; ap; ap = ap->next) {
3280 while ((n = *++argv) != NULL) {
3281 v = strchr(n+1, '=');
3282 if (v == NULL) { /* n+1: funny ksh stuff */
3283 ap = *__lookupalias(n);
3285 fprintf(stderr, "%s: %s not found\n", "alias", n);
3298 static int FAST_FUNC
3299 unaliascmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
3303 while ((i = nextopt("a")) != '\0') {
3309 for (i = 0; *argptr; argptr++) {
3310 if (unalias(*argptr)) {
3311 fprintf(stderr, "%s: %s not found\n", "unalias", *argptr);
3319 #endif /* ASH_ALIAS */
3322 /* ============ jobs.c */
3324 /* Mode argument to forkshell. Don't change FORK_FG or FORK_BG. */
3327 #define FORK_NOJOB 2
3329 /* mode flags for showjob(s) */
3330 #define SHOW_ONLY_PGID 0x01 /* show only pgid (jobs -p) */
3331 #define SHOW_PIDS 0x02 /* show individual pids, not just one line per job */
3332 #define SHOW_CHANGED 0x04 /* only jobs whose state has changed */
3335 * A job structure contains information about a job. A job is either a
3336 * single process or a set of processes contained in a pipeline. In the
3337 * latter case, pidlist will be non-NULL, and will point to a -1 terminated
3341 pid_t ps_pid; /* process id */
3342 int ps_status; /* last process status from wait() */
3343 char *ps_cmd; /* text of command being run */
3347 struct procstat ps0; /* status of process */
3348 struct procstat *ps; /* status or processes when more than one */
3350 int stopstatus; /* status of a stopped job */
3353 nprocs: 16, /* number of processes */
3355 #define JOBRUNNING 0 /* at least one proc running */
3356 #define JOBSTOPPED 1 /* all procs are stopped */
3357 #define JOBDONE 2 /* all procs are completed */
3359 sigint: 1, /* job was killed by SIGINT */
3360 jobctl: 1, /* job running under job control */
3362 waited: 1, /* true if this entry has been waited for */
3363 used: 1, /* true if this entry is in used */
3364 changed: 1; /* true if status has changed */
3365 struct job *prev_job; /* previous job */
3368 static struct job *makejob(/*union node *,*/ int);
3369 static int forkshell(struct job *, union node *, int);
3370 static int waitforjob(struct job *);
3373 enum { doing_jobctl = 0 };
3374 #define setjobctl(on) do {} while (0)
3376 static smallint doing_jobctl; //references:8
3377 static void setjobctl(int);
3384 ignoresig(int signo)
3386 /* Avoid unnecessary system calls. Is it already SIG_IGNed? */
3387 if (sigmode[signo - 1] != S_IGN && sigmode[signo - 1] != S_HARD_IGN) {
3388 /* No, need to do it */
3389 signal(signo, SIG_IGN);
3391 sigmode[signo - 1] = S_HARD_IGN;
3395 * Only one usage site - in setsignal()
3398 signal_handler(int signo)
3400 gotsig[signo - 1] = 1;
3402 if (signo == SIGINT && !trap[SIGINT]) {
3403 if (!suppress_int) {
3405 raise_interrupt(); /* does not return */
3409 pending_sig = signo;
3414 * Set the signal handler for the specified signal. The routine figures
3415 * out what it should be set to.
3418 setsignal(int signo)
3421 char cur_act, new_act;
3422 struct sigaction act;
3426 if (t != NULL) { /* trap for this sig is set */
3428 if (t[0] == '\0') /* trap is "": ignore this sig */
3432 if (rootshell && new_act == S_DFL) {
3435 if (iflag || minusc || sflag == 0)
3444 * "In all cases, bash ignores SIGQUIT. Non-builtin
3445 * commands run by bash have signal handlers
3446 * set to the values inherited by the shell
3447 * from its parent". */
3463 //TODO: if !rootshell, we reset SIGQUIT to DFL,
3464 //whereas we have to restore it to what shell got on entry
3465 //from the parent. See comment above
3467 t = &sigmode[signo - 1];
3470 /* current setting is not yet known */
3471 if (sigaction(signo, NULL, &act)) {
3472 /* pretend it worked; maybe we should give a warning,
3473 * but other shells don't. We don't alter sigmode,
3474 * so we retry every time.
3475 * btw, in Linux it never fails. --vda */
3478 if (act.sa_handler == SIG_IGN) {
3479 cur_act = S_HARD_IGN;
3481 && (signo == SIGTSTP || signo == SIGTTIN || signo == SIGTTOU)
3483 cur_act = S_IGN; /* don't hard ignore these */
3487 if (cur_act == S_HARD_IGN || cur_act == new_act)
3490 act.sa_handler = SIG_DFL;
3493 act.sa_handler = signal_handler;
3496 act.sa_handler = SIG_IGN;
3500 /* flags and mask matter only if !DFL and !IGN, but we do it
3501 * for all cases for more deterministic behavior:
3504 sigfillset(&act.sa_mask);
3506 sigaction_set(signo, &act);
3511 /* mode flags for set_curjob */
3512 #define CUR_DELETE 2
3513 #define CUR_RUNNING 1
3514 #define CUR_STOPPED 0
3516 /* mode flags for dowait */
3517 #define DOWAIT_NONBLOCK WNOHANG
3518 #define DOWAIT_BLOCK 0
3521 /* pgrp of shell on invocation */
3522 static int initialpgrp; //references:2
3523 static int ttyfd = -1; //5
3526 static struct job *jobtab; //5
3528 static unsigned njobs; //4
3530 static struct job *curjob; //lots
3531 /* number of presumed living untracked jobs */
3532 static int jobless; //4
3535 set_curjob(struct job *jp, unsigned mode)
3538 struct job **jpp, **curp;
3540 /* first remove from list */
3541 jpp = curp = &curjob;
3546 jpp = &jp1->prev_job;
3548 *jpp = jp1->prev_job;
3550 /* Then re-insert in correct position */
3558 /* job being deleted */
3561 /* newly created job or backgrounded job,
3562 put after all stopped jobs. */
3566 if (!jp1 || jp1->state != JOBSTOPPED)
3569 jpp = &jp1->prev_job;
3575 /* newly stopped job - becomes curjob */
3576 jp->prev_job = *jpp;
3584 jobno(const struct job *jp)
3586 return jp - jobtab + 1;
3591 * Convert a job name to a job structure.
3594 #define getjob(name, getctl) getjob(name)
3597 getjob(const char *name, int getctl)
3601 const char *err_msg = "%s: no such job";
3605 char *(*match)(const char *, const char *);
3620 if (c == '+' || c == '%') {
3622 err_msg = "No current job";
3628 err_msg = "No previous job";
3639 jp = jobtab + num - 1;
3654 if (match(jp->ps[0].ps_cmd, p)) {
3658 err_msg = "%s: ambiguous";
3668 err_msg = "job %s not created under job control";
3669 if (getctl && jp->jobctl == 0)
3674 ash_msg_and_raise_error(err_msg, name);
3678 * Mark a job structure as unused.
3681 freejob(struct job *jp)
3683 struct procstat *ps;
3687 for (i = jp->nprocs, ps = jp->ps; --i >= 0; ps++) {
3688 if (ps->ps_cmd != nullstr)
3691 if (jp->ps != &jp->ps0)
3694 set_curjob(jp, CUR_DELETE);
3700 xtcsetpgrp(int fd, pid_t pgrp)
3702 if (tcsetpgrp(fd, pgrp))
3703 ash_msg_and_raise_error("can't set tty process group (%m)");
3707 * Turn job control on and off.
3709 * Note: This code assumes that the third arg to ioctl is a character
3710 * pointer, which is true on Berkeley systems but not System V. Since
3711 * System V doesn't have job control yet, this isn't a problem now.
3713 * Called with interrupts off.
3721 if (on == doing_jobctl || rootshell == 0)
3725 ofd = fd = open(_PATH_TTY, O_RDWR);
3727 /* BTW, bash will try to open(ttyname(0)) if open("/dev/tty") fails.
3728 * That sometimes helps to acquire controlling tty.
3729 * Obviously, a workaround for bugs when someone
3730 * failed to provide a controlling tty to bash! :) */
3736 fd = fcntl(fd, F_DUPFD, 10);
3741 /* fd is a tty at this point */
3742 close_on_exec_on(fd);
3743 while (1) { /* while we are in the background */
3744 pgrp = tcgetpgrp(fd);
3747 ash_msg("can't access tty; job control turned off");
3751 if (pgrp == getpgrp())
3762 xtcsetpgrp(fd, pgrp);
3764 /* turning job control off */
3767 /* was xtcsetpgrp, but this can make exiting ash
3768 * loop forever if pty is already deleted */
3769 tcsetpgrp(fd, pgrp);
3783 static int FAST_FUNC
3784 killcmd(int argc, char **argv)
3786 if (argv[1] && strcmp(argv[1], "-l") != 0) {
3789 if (argv[i][0] == '%') {
3791 * "kill %N" - job kill
3792 * Converting to pgrp / pid kill
3798 jp = getjob(argv[i], 0);
3800 * In jobs started under job control, we signal
3801 * entire process group by kill -PGRP_ID.
3802 * This happens, f.e., in interactive shell.
3804 * Otherwise, we signal each child via
3805 * kill PID1 PID2 PID3.
3807 * sh -c 'sleep 1|sleep 1 & kill %1'
3808 * sh -c 'true|sleep 2 & sleep 1; kill %1'
3809 * sh -c 'true|sleep 1 & sleep 2; kill %1'
3811 n = jp->nprocs; /* can't be 0 (I hope) */
3814 dst = alloca(n * sizeof(int)*4);
3816 for (j = 0; j < n; j++) {
3817 struct procstat *ps = &jp->ps[j];
3818 /* Skip non-running and not-stopped members
3819 * (i.e. dead members) of the job
3821 if (ps->ps_status != -1 && !WIFSTOPPED(ps->ps_status))
3824 * kill_main has matching code to expect
3825 * leading space. Needed to not confuse
3826 * negative pids with "kill -SIGNAL_NO" syntax
3828 dst += sprintf(dst, jp->jobctl ? " -%u" : " %u", (int)ps->ps_pid);
3832 } while (argv[++i]);
3834 return kill_main(argc, argv);
3838 showpipe(struct job *jp /*, FILE *out*/)
3840 struct procstat *ps;
3841 struct procstat *psend;
3843 psend = jp->ps + jp->nprocs;
3844 for (ps = jp->ps + 1; ps < psend; ps++)
3845 printf(" | %s", ps->ps_cmd);
3846 outcslow('\n', stdout);
3847 flush_stdout_stderr();
3852 restartjob(struct job *jp, int mode)
3854 struct procstat *ps;
3860 if (jp->state == JOBDONE)
3862 jp->state = JOBRUNNING;
3863 pgid = jp->ps[0].ps_pid;
3864 if (mode == FORK_FG)
3865 xtcsetpgrp(ttyfd, pgid);
3866 killpg(pgid, SIGCONT);
3870 if (WIFSTOPPED(ps->ps_status)) {
3876 status = (mode == FORK_FG) ? waitforjob(jp) : 0;
3881 static int FAST_FUNC
3882 fg_bgcmd(int argc UNUSED_PARAM, char **argv)
3888 mode = (**argv == 'f') ? FORK_FG : FORK_BG;
3892 jp = getjob(*argv, 1);
3893 if (mode == FORK_BG) {
3894 set_curjob(jp, CUR_RUNNING);
3895 printf("[%d] ", jobno(jp));
3897 out1str(jp->ps[0].ps_cmd);
3898 showpipe(jp /*, stdout*/);
3899 retval = restartjob(jp, mode);
3900 } while (*argv && *++argv);
3906 sprint_status(char *s, int status, int sigonly)
3912 if (!WIFEXITED(status)) {
3914 if (WIFSTOPPED(status))
3915 st = WSTOPSIG(status);
3918 st = WTERMSIG(status);
3920 if (st == SIGINT || st == SIGPIPE)
3923 if (WIFSTOPPED(status))
3928 //TODO: use bbox's get_signame? strsignal adds ~600 bytes to text+rodata
3929 col = fmtstr(s, 32, strsignal(st));
3930 if (WCOREDUMP(status)) {
3931 col += fmtstr(s + col, 16, " (core dumped)");
3933 } else if (!sigonly) {
3934 st = WEXITSTATUS(status);
3936 col = fmtstr(s, 16, "Done(%d)", st);
3938 col = fmtstr(s, 16, "Done");
3945 dowait(int wait_flags, struct job *job)
3950 struct job *thisjob;
3953 TRACE(("dowait(0x%x) called\n", wait_flags));
3955 /* Do a wait system call. If job control is compiled in, we accept
3956 * stopped processes. wait_flags may have WNOHANG, preventing blocking.
3957 * NB: _not_ safe_waitpid, we need to detect EINTR */
3959 wait_flags |= WUNTRACED;
3960 pid = waitpid(-1, &status, wait_flags);
3961 TRACE(("wait returns pid=%d, status=0x%x, errno=%d(%s)\n",
3962 pid, status, errno, strerror(errno)));
3968 for (jp = curjob; jp; jp = jp->prev_job) {
3969 struct procstat *ps;
3970 struct procstat *psend;
3971 if (jp->state == JOBDONE)
3975 psend = ps + jp->nprocs;
3977 if (ps->ps_pid == pid) {
3978 TRACE(("Job %d: changing status of proc %d "
3979 "from 0x%x to 0x%x\n",
3980 jobno(jp), pid, ps->ps_status, status));
3981 ps->ps_status = status;
3984 if (ps->ps_status == -1)
3987 if (state == JOBRUNNING)
3989 if (WIFSTOPPED(ps->ps_status)) {
3990 jp->stopstatus = ps->ps_status;
3994 } while (++ps < psend);
3999 if (!WIFSTOPPED(status))
4005 if (state != JOBRUNNING) {
4006 thisjob->changed = 1;
4008 if (thisjob->state != state) {
4009 TRACE(("Job %d: changing state from %d to %d\n",
4010 jobno(thisjob), thisjob->state, state));
4011 thisjob->state = state;
4013 if (state == JOBSTOPPED) {
4014 set_curjob(thisjob, CUR_STOPPED);
4023 if (thisjob && thisjob == job) {
4027 len = sprint_status(s, status, 1);
4038 blocking_wait_with_raise_on_sig(void)
4040 pid_t pid = dowait(DOWAIT_BLOCK, NULL);
4041 if (pid <= 0 && pending_sig)
4042 raise_exception(EXSIG);
4048 showjob(FILE *out, struct job *jp, int mode)
4050 struct procstat *ps;
4051 struct procstat *psend;
4058 if (mode & SHOW_ONLY_PGID) { /* jobs -p */
4059 /* just output process (group) id of pipeline */
4060 fprintf(out, "%d\n", ps->ps_pid);
4064 col = fmtstr(s, 16, "[%d] ", jobno(jp));
4069 else if (curjob && jp == curjob->prev_job)
4072 if (mode & SHOW_PIDS)
4073 col += fmtstr(s + col, 16, "%d ", ps->ps_pid);
4075 psend = ps + jp->nprocs;
4077 if (jp->state == JOBRUNNING) {
4078 strcpy(s + col, "Running");
4079 col += sizeof("Running") - 1;
4081 int status = psend[-1].ps_status;
4082 if (jp->state == JOBSTOPPED)
4083 status = jp->stopstatus;
4084 col += sprint_status(s + col, status, 0);
4086 /* By now, "[JOBID]* [maybe PID] STATUS" is printed */
4088 /* This loop either prints "<cmd1> | <cmd2> | <cmd3>" line
4089 * or prints several "PID | <cmdN>" lines,
4090 * depending on SHOW_PIDS bit.
4091 * We do not print status of individual processes
4092 * between PID and <cmdN>. bash does it, but not very well:
4093 * first line shows overall job status, not process status,
4094 * making it impossible to know 1st process status.
4098 /* for each process */
4101 if (mode & SHOW_PIDS)
4102 col = fmtstr(s, 48, "\n%*c%d ", indent_col, ' ', ps->ps_pid) - 1;
4104 fprintf(out, "%s%*c%s%s",
4106 33 - col >= 0 ? 33 - col : 0, ' ',
4107 ps == jp->ps ? "" : "| ",
4110 } while (++ps != psend);
4111 outcslow('\n', out);
4115 if (jp->state == JOBDONE) {
4116 TRACE(("showjob: freeing job %d\n", jobno(jp)));
4122 * Print a list of jobs. If "change" is nonzero, only print jobs whose
4123 * statuses have changed since the last call to showjobs.
4126 showjobs(FILE *out, int mode)
4130 TRACE(("showjobs(0x%x) called\n", mode));
4132 /* Handle all finished jobs */
4133 while (dowait(DOWAIT_NONBLOCK, NULL) > 0)
4136 for (jp = curjob; jp; jp = jp->prev_job) {
4137 if (!(mode & SHOW_CHANGED) || jp->changed) {
4138 showjob(out, jp, mode);
4143 static int FAST_FUNC
4144 jobscmd(int argc UNUSED_PARAM, char **argv)
4149 while ((m = nextopt("lp")) != '\0') {
4153 mode |= SHOW_ONLY_PGID;
4159 showjob(stdout, getjob(*argv, 0), mode);
4162 showjobs(stdout, mode);
4169 /* Called only on finished or stopped jobs (no members are running) */
4171 getstatus(struct job *job)
4175 struct procstat *ps;
4177 /* Fetch last member's status */
4178 ps = job->ps + job->nprocs - 1;
4179 status = ps->ps_status;
4181 /* "set -o pipefail" mode: use last _nonzero_ status */
4182 while (status == 0 && --ps >= job->ps)
4183 status = ps->ps_status;
4186 retval = WEXITSTATUS(status);
4187 if (!WIFEXITED(status)) {
4189 retval = WSTOPSIG(status);
4190 if (!WIFSTOPPED(status))
4193 /* XXX: limits number of signals */
4194 retval = WTERMSIG(status);
4196 if (retval == SIGINT)
4202 TRACE(("getstatus: job %d, nproc %d, status 0x%x, retval 0x%x\n",
4203 jobno(job), job->nprocs, status, retval));
4207 static int FAST_FUNC
4208 waitcmd(int argc UNUSED_PARAM, char **argv)
4215 raise_exception(EXSIG);
4222 /* wait for all jobs */
4226 if (!jp) /* no running procs */
4228 if (jp->state == JOBRUNNING)
4233 blocking_wait_with_raise_on_sig();
4235 * "When bash is waiting for an asynchronous command via
4236 * the wait builtin, the reception of a signal for which a trap
4237 * has been set will cause the wait builtin to return immediately
4238 * with an exit status greater than 128, immediately after which
4239 * the trap is executed."
4241 * blocking_wait_with_raise_on_sig raises signal handlers
4242 * if it gets no pid (pid < 0). However,
4243 * if child sends us a signal *and immediately exits*,
4244 * blocking_wait_with_raise_on_sig gets pid > 0
4245 * and does not handle pending_sig. Check this case: */
4247 raise_exception(EXSIG);
4253 if (**argv != '%') {
4254 pid_t pid = number(*argv);
4259 if (job->ps[job->nprocs - 1].ps_pid == pid)
4261 job = job->prev_job;
4264 job = getjob(*argv, 0);
4266 /* loop until process terminated or stopped */
4267 while (job->state == JOBRUNNING)
4268 blocking_wait_with_raise_on_sig();
4270 retval = getstatus(job);
4283 struct job *jp, *jq;
4285 len = njobs * sizeof(*jp);
4287 jp = ckrealloc(jq, len + 4 * sizeof(*jp));
4289 offset = (char *)jp - (char *)jq;
4291 /* Relocate pointers */
4294 jq = (struct job *)((char *)jq + l);
4298 #define joff(p) ((struct job *)((char *)(p) + l))
4299 #define jmove(p) (p) = (void *)((char *)(p) + offset)
4300 if (joff(jp)->ps == &jq->ps0)
4301 jmove(joff(jp)->ps);
4302 if (joff(jp)->prev_job)
4303 jmove(joff(jp)->prev_job);
4313 jp = (struct job *)((char *)jp + len);
4317 } while (--jq >= jp);
4322 * Return a new job structure.
4323 * Called with interrupts off.
4326 makejob(/*union node *node,*/ int nprocs)
4331 for (i = njobs, jp = jobtab; ; jp++) {
4338 if (jp->state != JOBDONE || !jp->waited)
4347 memset(jp, 0, sizeof(*jp));
4349 /* jp->jobctl is a bitfield.
4350 * "jp->jobctl |= jobctl" likely to give awful code */
4354 jp->prev_job = curjob;
4359 jp->ps = ckmalloc(nprocs * sizeof(struct procstat));
4361 TRACE(("makejob(%d) returns %%%d\n", nprocs,
4368 * Return a string identifying a command (to be printed by the
4371 static char *cmdnextc;
4374 cmdputs(const char *s)
4376 static const char vstype[VSTYPE + 1][3] = {
4377 "", "}", "-", "+", "?", "=",
4378 "%", "%%", "#", "##"
4379 IF_ASH_BASH_COMPAT(, ":", "/", "//")
4382 const char *p, *str;
4386 unsigned char subtype = 0;
4390 nextc = makestrspace((strlen(s) + 1) * 8, cmdnextc);
4392 while ((c = *p++) != '\0') {
4400 if ((subtype & VSTYPE) == VSLENGTH)
4404 if (!(subtype & VSQUOTE) == !(quoted & 1))
4410 str = "\"}" + !(quoted & 1);
4417 case CTLBACKQ+CTLQUOTE:
4420 #if ENABLE_SH_MATH_SUPPORT
4435 if ((subtype & VSTYPE) != VSNORMAL)
4437 str = vstype[subtype & VSTYPE];
4438 if (subtype & VSNUL)
4447 /* These can only happen inside quotes */
4460 while ((c = *str++) != '\0') {
4463 } /* while *p++ not NUL */
4466 USTPUTC('"', nextc);
4472 /* cmdtxt() and cmdlist() call each other */
4473 static void cmdtxt(union node *n);
4476 cmdlist(union node *np, int sep)
4478 for (; np; np = np->narg.next) {
4482 if (sep && np->narg.next)
4488 cmdtxt(union node *n)
4491 struct nodelist *lp;
4502 lp = n->npipe.cmdlist;
4520 cmdtxt(n->nbinary.ch1);
4536 cmdtxt(n->nif.test);
4538 if (n->nif.elsepart) {
4539 cmdtxt(n->nif.ifpart);
4541 n = n->nif.elsepart;
4559 cmdtxt(n->nbinary.ch1);
4569 cmdputs(n->nfor.var);
4571 cmdlist(n->nfor.args, 1);
4576 cmdputs(n->narg.text);
4580 cmdlist(n->ncmd.args, 1);
4581 cmdlist(n->ncmd.redirect, 0);
4594 cmdputs(n->ncase.expr->narg.text);
4596 for (np = n->ncase.cases; np; np = np->nclist.next) {
4597 cmdtxt(np->nclist.pattern);
4599 cmdtxt(np->nclist.body);
4613 #if ENABLE_ASH_BASH_COMPAT
4628 cmdputs(utoa(n->nfile.fd));
4630 if (n->type == NTOFD || n->type == NFROMFD) {
4631 cmdputs(utoa(n->ndup.dupfd));
4640 commandtext(union node *n)
4644 STARTSTACKSTR(cmdnextc);
4646 name = stackblock();
4647 TRACE(("commandtext: name %p, end %p\n\t\"%s\"\n",
4648 name, cmdnextc, cmdnextc));
4649 return ckstrdup(name);
4654 * Fork off a subshell. If we are doing job control, give the subshell its
4655 * own process group. Jp is a job structure that the job is to be added to.
4656 * N is the command that will be evaluated by the child. Both jp and n may
4657 * be NULL. The mode parameter can be one of the following:
4658 * FORK_FG - Fork off a foreground process.
4659 * FORK_BG - Fork off a background process.
4660 * FORK_NOJOB - Like FORK_FG, but don't give the process its own
4661 * process group even if job control is on.
4663 * When job control is turned off, background processes have their standard
4664 * input redirected to /dev/null (except for the second and later processes
4667 * Called with interrupts off.
4670 * Clear traps on a fork.
4677 for (tp = trap; tp < &trap[NSIG]; tp++) {
4678 if (*tp && **tp) { /* trap not NULL or "" (SIG_IGN) */
4680 if (trap_ptr == trap)
4682 /* else: it "belongs" to trap_ptr vector, don't free */
4684 if ((tp - trap) != 0)
4685 setsignal(tp - trap);
4692 /* Lives far away from here, needed for forkchild */
4693 static void closescript(void);
4695 /* Called after fork(), in child */
4696 static NOINLINE void
4697 forkchild(struct job *jp, union node *n, int mode)
4701 TRACE(("Child shell %d\n", getpid()));
4705 /* man bash: "Non-builtin commands run by bash have signal handlers
4706 * set to the values inherited by the shell from its parent".
4707 * Do we do it correctly? */
4711 if (mode == FORK_NOJOB /* is it `xxx` ? */
4712 && n && n->type == NCMD /* is it single cmd? */
4713 /* && n->ncmd.args->type == NARG - always true? */
4714 && n->ncmd.args && strcmp(n->ncmd.args->narg.text, "trap") == 0
4715 && n->ncmd.args->narg.next == NULL /* "trap" with no arguments */
4716 /* && n->ncmd.args->narg.backquote == NULL - do we need to check this? */
4718 TRACE(("Trap hack\n"));
4719 /* Awful hack for `trap` or $(trap).
4721 * http://www.opengroup.org/onlinepubs/009695399/utilities/trap.html
4722 * contains an example where "trap" is executed in a subshell:
4724 * save_traps=$(trap)
4726 * eval "$save_traps"
4728 * Standard does not say that "trap" in subshell shall print
4729 * parent shell's traps. It only says that its output
4730 * must have suitable form, but then, in the above example
4731 * (which is not supposed to be normative), it implies that.
4733 * bash (and probably other shell) does implement it
4734 * (traps are reset to defaults, but "trap" still shows them),
4735 * but as a result, "trap" logic is hopelessly messed up:
4738 * trap -- 'echo Ho' SIGWINCH <--- we have a handler
4739 * # (trap) <--- trap is in subshell - no output (correct, traps are reset)
4740 * # true | trap <--- trap is in subshell - no output (ditto)
4741 * # echo `true | trap` <--- in subshell - output (but traps are reset!)
4742 * trap -- 'echo Ho' SIGWINCH
4743 * # echo `(trap)` <--- in subshell in subshell - output
4744 * trap -- 'echo Ho' SIGWINCH
4745 * # echo `true | (trap)` <--- in subshell in subshell in subshell - output!
4746 * trap -- 'echo Ho' SIGWINCH
4748 * The rules when to forget and when to not forget traps
4749 * get really complex and nonsensical.
4751 * Our solution: ONLY bare $(trap) or `trap` is special.
4753 /* Save trap handler strings for trap builtin to print */
4754 trap_ptr = memcpy(xmalloc(sizeof(trap)), trap, sizeof(trap));
4755 /* Fall through into clearing traps */
4759 /* do job control only in root shell */
4761 if (mode != FORK_NOJOB && jp->jobctl && oldlvl == 0) {
4764 if (jp->nprocs == 0)
4767 pgrp = jp->ps[0].ps_pid;
4768 /* this can fail because we are doing it in the parent also */
4770 if (mode == FORK_FG)
4771 xtcsetpgrp(ttyfd, pgrp);
4776 if (mode == FORK_BG) {
4777 /* man bash: "When job control is not in effect,
4778 * asynchronous commands ignore SIGINT and SIGQUIT" */
4781 if (jp->nprocs == 0) {
4783 if (open(bb_dev_null, O_RDONLY) != 0)
4784 ash_msg_and_raise_error("can't open '%s'", bb_dev_null);
4788 if (iflag) { /* why if iflag only? */
4793 * "In all cases, bash ignores SIGQUIT. Non-builtin
4794 * commands run by bash have signal handlers
4795 * set to the values inherited by the shell
4797 * Take care of the second rule: */
4801 if (n && n->type == NCMD
4802 && n->ncmd.args && strcmp(n->ncmd.args->narg.text, "jobs") == 0
4804 TRACE(("Job hack\n"));
4805 /* "jobs": we do not want to clear job list for it,
4806 * instead we remove only _its_ own_ job from job list.
4807 * This makes "jobs .... | cat" more useful.
4813 for (jp = curjob; jp; jp = jp->prev_job)
4818 /* Called after fork(), in parent */
4820 #define forkparent(jp, n, mode, pid) forkparent(jp, mode, pid)
4823 forkparent(struct job *jp, union node *n, int mode, pid_t pid)
4825 TRACE(("In parent shell: child = %d\n", pid));
4827 while (jobless && dowait(DOWAIT_NONBLOCK, NULL) > 0)
4833 if (mode != FORK_NOJOB && jp->jobctl) {
4836 if (jp->nprocs == 0)
4839 pgrp = jp->ps[0].ps_pid;
4840 /* This can fail because we are doing it in the child also */
4844 if (mode == FORK_BG) {
4845 backgndpid = pid; /* set $! */
4846 set_curjob(jp, CUR_RUNNING);
4849 struct procstat *ps = &jp->ps[jp->nprocs++];
4852 ps->ps_cmd = nullstr;
4854 if (doing_jobctl && n)
4855 ps->ps_cmd = commandtext(n);
4861 forkshell(struct job *jp, union node *n, int mode)
4865 TRACE(("forkshell(%%%d, %p, %d) called\n", jobno(jp), n, mode));
4868 TRACE(("Fork failed, errno=%d", errno));
4871 ash_msg_and_raise_error("can't fork");
4874 CLEAR_RANDOM_T(&random_gen); /* or else $RANDOM repeats in child */
4875 forkchild(jp, n, mode);
4877 forkparent(jp, n, mode, pid);
4883 * Wait for job to finish.
4885 * Under job control we have the problem that while a child process
4886 * is running interrupts generated by the user are sent to the child
4887 * but not to the shell. This means that an infinite loop started by
4888 * an interactive user may be hard to kill. With job control turned off,
4889 * an interactive user may place an interactive program inside a loop.
4890 * If the interactive program catches interrupts, the user doesn't want
4891 * these interrupts to also abort the loop. The approach we take here
4892 * is to have the shell ignore interrupt signals while waiting for a
4893 * foreground process to terminate, and then send itself an interrupt
4894 * signal if the child process was terminated by an interrupt signal.
4895 * Unfortunately, some programs want to do a bit of cleanup and then
4896 * exit on interrupt; unless these processes terminate themselves by
4897 * sending a signal to themselves (instead of calling exit) they will
4898 * confuse this approach.
4900 * Called with interrupts off.
4903 waitforjob(struct job *jp)
4907 TRACE(("waitforjob(%%%d) called\n", jobno(jp)));
4910 while (jp->state == JOBRUNNING) {
4911 /* In non-interactive shells, we _can_ get
4912 * a keyboard signal here and be EINTRed,
4913 * but we just loop back, waiting for command to complete.
4916 * "If bash is waiting for a command to complete and receives
4917 * a signal for which a trap has been set, the trap
4918 * will not be executed until the command completes."
4920 * Reality is that even if trap is not set, bash
4921 * will not act on the signal until command completes.
4922 * Try this. sleep5intoff.c:
4923 * #include <signal.h>
4924 * #include <unistd.h>
4927 * sigemptyset(&set);
4928 * sigaddset(&set, SIGINT);
4929 * sigaddset(&set, SIGQUIT);
4930 * sigprocmask(SIG_BLOCK, &set, NULL);
4934 * $ bash -c './sleep5intoff; echo hi'
4935 * ^C^C^C^C <--- pressing ^C once a second
4937 * $ bash -c './sleep5intoff; echo hi'
4938 * ^\^\^\^\hi <--- pressing ^\ (SIGQUIT)
4941 dowait(DOWAIT_BLOCK, jp);
4948 xtcsetpgrp(ttyfd, rootpid);
4950 * This is truly gross.
4951 * If we're doing job control, then we did a TIOCSPGRP which
4952 * caused us (the shell) to no longer be in the controlling
4953 * session -- so we wouldn't have seen any ^C/SIGINT. So, we
4954 * intuit from the subprocess exit status whether a SIGINT
4955 * occurred, and if so interrupt ourselves. Yuck. - mycroft
4957 if (jp->sigint) /* TODO: do the same with all signals */
4958 raise(SIGINT); /* ... by raise(jp->sig) instead? */
4960 if (jp->state == JOBDONE)
4967 * return 1 if there are stopped jobs, otherwise 0
4979 if (jp && jp->state == JOBSTOPPED) {
4980 out2str("You have stopped jobs.\n");
4989 /* ============ redir.c
4991 * Code for dealing with input/output redirection.
4996 #define EMPTY -2 /* marks an unused slot in redirtab */
4997 #define CLOSED -3 /* marks a slot of previously-closed fd */
5000 * Open a file in noclobber mode.
5001 * The code was copied from bash.
5004 noclobberopen(const char *fname)
5007 struct stat finfo, finfo2;
5010 * If the file exists and is a regular file, return an error
5013 r = stat(fname, &finfo);
5014 if (r == 0 && S_ISREG(finfo.st_mode)) {
5020 * If the file was not present (r != 0), make sure we open it
5021 * exclusively so that if it is created before we open it, our open
5022 * will fail. Make sure that we do not truncate an existing file.
5023 * Note that we don't turn on O_EXCL unless the stat failed -- if the
5024 * file was not a regular file, we leave O_EXCL off.
5027 return open(fname, O_WRONLY|O_CREAT|O_EXCL, 0666);
5028 fd = open(fname, O_WRONLY|O_CREAT, 0666);
5030 /* If the open failed, return the file descriptor right away. */
5035 * OK, the open succeeded, but the file may have been changed from a
5036 * non-regular file to a regular file between the stat and the open.
5037 * We are assuming that the O_EXCL open handles the case where FILENAME
5038 * did not exist and is symlinked to an existing file between the stat
5043 * If we can open it and fstat the file descriptor, and neither check
5044 * revealed that it was a regular file, and the file has not been
5045 * replaced, return the file descriptor.
5047 if (fstat(fd, &finfo2) == 0
5048 && !S_ISREG(finfo2.st_mode)
5049 && finfo.st_dev == finfo2.st_dev
5050 && finfo.st_ino == finfo2.st_ino
5055 /* The file has been replaced. badness. */
5062 * Handle here documents. Normally we fork off a process to write the
5063 * data to a pipe. If the document is short, we can stuff the data in
5064 * the pipe without forking.
5066 /* openhere needs this forward reference */
5067 static void expandhere(union node *arg, int fd);
5069 openhere(union node *redir)
5075 ash_msg_and_raise_error("pipe call failed");
5076 if (redir->type == NHERE) {
5077 len = strlen(redir->nhere.doc->narg.text);
5078 if (len <= PIPE_BUF) {
5079 full_write(pip[1], redir->nhere.doc->narg.text, len);
5083 if (forkshell((struct job *)NULL, (union node *)NULL, FORK_NOJOB) == 0) {
5086 ignoresig(SIGINT); //signal(SIGINT, SIG_IGN);
5087 ignoresig(SIGQUIT); //signal(SIGQUIT, SIG_IGN);
5088 ignoresig(SIGHUP); //signal(SIGHUP, SIG_IGN);
5089 ignoresig(SIGTSTP); //signal(SIGTSTP, SIG_IGN);
5090 signal(SIGPIPE, SIG_DFL);
5091 if (redir->type == NHERE)
5092 full_write(pip[1], redir->nhere.doc->narg.text, len);
5094 expandhere(redir->nhere.doc, pip[1]);
5095 _exit(EXIT_SUCCESS);
5103 openredirect(union node *redir)
5108 switch (redir->nfile.type) {
5110 fname = redir->nfile.expfname;
5111 f = open(fname, O_RDONLY);
5116 fname = redir->nfile.expfname;
5117 f = open(fname, O_RDWR|O_CREAT, 0666);
5122 #if ENABLE_ASH_BASH_COMPAT
5125 /* Take care of noclobber mode. */
5127 fname = redir->nfile.expfname;
5128 f = noclobberopen(fname);
5135 fname = redir->nfile.expfname;
5136 f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666);
5141 fname = redir->nfile.expfname;
5142 f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666);
5150 /* Fall through to eliminate warning. */
5151 /* Our single caller does this itself */
5158 f = openhere(redir);
5164 ash_msg_and_raise_error("can't create %s: %s", fname, errmsg(errno, "nonexistent directory"));
5166 ash_msg_and_raise_error("can't open %s: %s", fname, errmsg(errno, "no such file"));
5170 * Copy a file descriptor to be >= to. Returns -1
5171 * if the source file descriptor is closed, EMPTY if there are no unused
5172 * file descriptors left.
5174 /* 0x800..00: bit to set in "to" to request dup2 instead of fcntl(F_DUPFD).
5175 * old code was doing close(to) prior to copyfd() to achieve the same */
5177 COPYFD_EXACT = (int)~(INT_MAX),
5178 COPYFD_RESTORE = (int)((unsigned)COPYFD_EXACT >> 1),
5181 copyfd(int from, int to)
5185 if (to & COPYFD_EXACT) {
5186 to &= ~COPYFD_EXACT;
5188 newfd = dup2(from, to);
5190 newfd = fcntl(from, F_DUPFD, to);
5193 if (errno == EMFILE)
5195 /* Happens when source fd is not open: try "echo >&99" */
5196 ash_msg_and_raise_error("%d: %m", from);
5201 /* Struct def and variable are moved down to the first usage site */
5206 struct redirtab *next;
5209 struct two_fd_t two_fd[];
5211 #define redirlist (G_var.redirlist)
5213 static int need_to_remember(struct redirtab *rp, int fd)
5217 if (!rp) /* remembering was not requested */
5220 for (i = 0; i < rp->pair_count; i++) {
5221 if (rp->two_fd[i].orig == fd) {
5222 /* already remembered */
5229 /* "hidden" fd is a fd used to read scripts, or a copy of such */
5230 static int is_hidden_fd(struct redirtab *rp, int fd)
5233 struct parsefile *pf;
5237 /* Check open scripts' fds */
5240 /* We skip pf_fd == 0 case because of the following case:
5241 * $ ash # running ash interactively
5243 * and in script.sh: "exec 9>&0".
5244 * Even though top-level pf_fd _is_ 0,
5245 * it's still ok to use it: "read" builtin uses it,
5246 * why should we cripple "exec" builtin?
5248 if (pf->pf_fd > 0 && fd == pf->pf_fd) {
5256 /* Check saved fds of redirects */
5257 fd |= COPYFD_RESTORE;
5258 for (i = 0; i < rp->pair_count; i++) {
5259 if (rp->two_fd[i].copy == fd) {
5267 * Process a list of redirection commands. If the REDIR_PUSH flag is set,
5268 * old file descriptors are stashed away so that the redirection can be
5269 * undone by calling popredir.
5271 /* flags passed to redirect */
5272 #define REDIR_PUSH 01 /* save previous values of file descriptors */
5273 #define REDIR_SAVEFD2 03 /* set preverrout */
5275 redirect(union node *redir, int flags)
5277 struct redirtab *sv;
5282 int copied_fd2 = -1;
5292 if (flags & REDIR_PUSH) {
5293 union node *tmp = redir;
5296 #if ENABLE_ASH_BASH_COMPAT
5297 if (tmp->nfile.type == NTO2)
5300 tmp = tmp->nfile.next;
5302 sv = ckmalloc(sizeof(*sv) + sv_pos * sizeof(sv->two_fd[0]));
5303 sv->next = redirlist;
5304 sv->pair_count = sv_pos;
5306 sv->nullredirs = g_nullredirs - 1;
5308 while (sv_pos > 0) {
5310 sv->two_fd[sv_pos].orig = sv->two_fd[sv_pos].copy = EMPTY;
5316 fd = redir->nfile.fd;
5317 if (redir->nfile.type == NTOFD || redir->nfile.type == NFROMFD) {
5318 right_fd = redir->ndup.dupfd;
5319 //bb_error_msg("doing %d > %d", fd, right_fd);
5320 /* redirect from/to same file descriptor? */
5323 /* "echo >&10" and 10 is a fd opened to a sh script? */
5324 if (is_hidden_fd(sv, right_fd)) {
5325 errno = EBADF; /* as if it is closed */
5326 ash_msg_and_raise_error("%d: %m", right_fd);
5330 newfd = openredirect(redir); /* always >= 0 */
5332 /* Descriptor wasn't open before redirect.
5333 * Mark it for close in the future */
5334 if (need_to_remember(sv, fd)) {
5335 goto remember_to_close;
5340 #if ENABLE_ASH_BASH_COMPAT
5343 if (need_to_remember(sv, fd)) {
5344 /* Copy old descriptor */
5345 /* Careful to not accidentally "save"
5346 * to the same fd as right side fd in N>&M */
5347 int minfd = right_fd < 10 ? 10 : right_fd + 1;
5348 i = fcntl(fd, F_DUPFD, minfd);
5349 /* You'd expect copy to be CLOEXECed. Currently these extra "saved" fds
5350 * are closed in popredir() in the child, preventing them from leaking
5351 * into child. (popredir() also cleans up the mess in case of failures)
5356 /* Strange error (e.g. "too many files" EMFILE?) */
5360 ash_msg_and_raise_error("%d: %m", fd);
5363 /* EBADF: it is not open - good, remember to close it */
5366 } else { /* fd is open, save its copy */
5367 /* "exec fd>&-" should not close fds
5368 * which point to script file(s).
5369 * Force them to be restored afterwards */
5370 if (is_hidden_fd(sv, fd))
5371 i |= COPYFD_RESTORE;
5375 sv->two_fd[sv_pos].orig = fd;
5376 sv->two_fd[sv_pos].copy = i;
5380 /* NTOFD/NFROMFD: copy redir->ndup.dupfd to fd */
5381 if (redir->ndup.dupfd < 0) { /* "fd>&-" */
5382 /* Don't want to trigger debugging */
5386 copyfd(redir->ndup.dupfd, fd | COPYFD_EXACT);
5388 } else if (fd != newfd) { /* move newfd to fd */
5389 copyfd(newfd, fd | COPYFD_EXACT);
5390 #if ENABLE_ASH_BASH_COMPAT
5391 if (!(redir->nfile.type == NTO2 && fd == 2))
5395 #if ENABLE_ASH_BASH_COMPAT
5396 if (redir->nfile.type == NTO2 && fd == 1) {
5397 /* We already redirected it to fd 1, now copy it to 2 */
5403 } while ((redir = redir->nfile.next) != NULL);
5406 if ((flags & REDIR_SAVEFD2) && copied_fd2 >= 0)
5407 preverrout_fd = copied_fd2;
5411 * Undo the effects of the last redirection.
5414 popredir(int drop, int restore)
5416 struct redirtab *rp;
5419 if (--g_nullredirs >= 0)
5423 for (i = 0; i < rp->pair_count; i++) {
5424 int fd = rp->two_fd[i].orig;
5425 int copy = rp->two_fd[i].copy;
5426 if (copy == CLOSED) {
5431 if (copy != EMPTY) {
5432 if (!drop || (restore && (copy & COPYFD_RESTORE))) {
5433 copy &= ~COPYFD_RESTORE;
5435 copyfd(copy, fd | COPYFD_EXACT);
5437 close(copy & ~COPYFD_RESTORE);
5440 redirlist = rp->next;
5441 g_nullredirs = rp->nullredirs;
5447 * Undo all redirections. Called on error or interrupt.
5451 * Discard all saved file descriptors.
5454 clearredir(int drop)
5460 popredir(drop, /*restore:*/ 0);
5465 redirectsafe(union node *redir, int flags)
5468 volatile int saveint;
5469 struct jmploc *volatile savehandler = exception_handler;
5470 struct jmploc jmploc;
5473 /* "echo 9>/dev/null; echo >&9; echo result: $?" - result should be 1, not 2! */
5474 err = setjmp(jmploc.loc); // huh?? was = setjmp(jmploc.loc) * 2;
5476 exception_handler = &jmploc;
5477 redirect(redir, flags);
5479 exception_handler = savehandler;
5480 if (err && exception_type != EXERROR)
5481 longjmp(exception_handler->loc, 1);
5482 RESTORE_INT(saveint);
5487 /* ============ Routines to expand arguments to commands
5489 * We have to deal with backquotes, shell variables, and file metacharacters.
5492 #if ENABLE_SH_MATH_SUPPORT
5494 ash_arith(const char *s)
5496 arith_state_t math_state;
5499 math_state.lookupvar = lookupvar;
5500 math_state.setvar = setvar2;
5501 //math_state.endofname = endofname;
5504 result = arith(&math_state, s);
5505 if (math_state.errmsg)
5506 ash_msg_and_raise_error(math_state.errmsg);
5516 #define EXP_FULL 0x1 /* perform word splitting & file globbing */
5517 #define EXP_TILDE 0x2 /* do normal tilde expansion */
5518 #define EXP_VARTILDE 0x4 /* expand tildes in an assignment */
5519 #define EXP_REDIR 0x8 /* file glob for a redirection (1 match only) */
5520 #define EXP_CASE 0x10 /* keeps quotes around for CASE pattern */
5521 #define EXP_RECORD 0x20 /* need to record arguments for ifs breakup */
5522 #define EXP_VARTILDE2 0x40 /* expand tildes after colons only */
5523 #define EXP_WORD 0x80 /* expand word in parameter expansion */
5524 #define EXP_QWORD 0x100 /* expand word in quoted parameter expansion */
5528 #define RMESCAPE_ALLOC 0x1 /* Allocate a new string */
5529 #define RMESCAPE_GLOB 0x2 /* Add backslashes for glob */
5530 #define RMESCAPE_QUOTED 0x4 /* Remove CTLESC unless in quotes */
5531 #define RMESCAPE_GROW 0x8 /* Grow strings instead of stalloc */
5532 #define RMESCAPE_HEAP 0x10 /* Malloc strings instead of stalloc */
5535 * Structure specifying which parts of the string should be searched
5536 * for IFS characters.
5539 struct ifsregion *next; /* next region in list */
5540 int begoff; /* offset of start of region */
5541 int endoff; /* offset of end of region */
5542 int nulonly; /* search for nul bytes only */
5546 struct strlist *list;
5547 struct strlist **lastp;
5550 /* output of current string */
5551 static char *expdest;
5552 /* list of back quote expressions */
5553 static struct nodelist *argbackq;
5554 /* first struct in list of ifs regions */
5555 static struct ifsregion ifsfirst;
5556 /* last struct in list */
5557 static struct ifsregion *ifslastp;
5558 /* holds expanded arg list */
5559 static struct arglist exparg;
5564 #if !ENABLE_SH_MATH_SUPPORT
5565 /* cvtnum() is used even if math support is off (to prepare $? values and such) */
5566 typedef long arith_t;
5567 # define ARITH_FMT "%ld"
5574 expdest = makestrspace(32, expdest);
5575 len = fmtstr(expdest, 32, ARITH_FMT, num);
5576 STADJUST(len, expdest);
5581 esclen(const char *start, const char *p)
5585 while (p > start && (unsigned char)*--p == CTLESC) {
5592 * Remove any CTLESC characters from a string.
5595 rmescapes(char *str, int flag)
5597 static const char qchars[] ALIGN1 = { CTLESC, CTLQUOTEMARK, '\0' };
5601 unsigned protect_against_glob;
5604 p = strpbrk(str, qchars);
5610 if (flag & RMESCAPE_ALLOC) {
5611 size_t len = p - str;
5612 size_t fulllen = len + strlen(p) + 1;
5614 if (flag & RMESCAPE_GROW) {
5615 int strloc = str - (char *)stackblock();
5616 r = makestrspace(fulllen, expdest);
5617 /* p and str may be invalidated by makestrspace */
5618 str = (char *)stackblock() + strloc;
5620 } else if (flag & RMESCAPE_HEAP) {
5621 r = ckmalloc(fulllen);
5623 r = stalloc(fulllen);
5627 q = (char *)memcpy(q, str, len) + len;
5631 inquotes = (flag & RMESCAPE_QUOTED) ^ RMESCAPE_QUOTED;
5632 globbing = flag & RMESCAPE_GLOB;
5633 protect_against_glob = globbing;
5635 if ((unsigned char)*p == CTLQUOTEMARK) {
5636 // TODO: if no RMESCAPE_QUOTED in flags, inquotes never becomes 0
5637 // (alternates between RMESCAPE_QUOTED and ~RMESCAPE_QUOTED). Is it ok?
5638 // Note: both inquotes and protect_against_glob only affect whether
5639 // CTLESC,<ch> gets converted to <ch> or to \<ch>
5640 inquotes = ~inquotes;
5642 protect_against_glob = globbing;
5646 /* naked back slash */
5647 protect_against_glob = 0;
5650 if ((unsigned char)*p == CTLESC) {
5652 if (protect_against_glob && inquotes && *p != '/') {
5656 protect_against_glob = globbing;
5661 if (flag & RMESCAPE_GROW) {
5663 STADJUST(q - r + 1, expdest);
5667 #define pmatch(a, b) !fnmatch((a), (b), 0)
5670 * Prepare a pattern for a expmeta (internal glob(3)) call.
5672 * Returns an stalloced string.
5675 preglob(const char *pattern, int quoted, int flag)
5677 flag |= RMESCAPE_GLOB;
5679 flag |= RMESCAPE_QUOTED;
5681 return rmescapes((char *)pattern, flag);
5685 * Put a string on the stack.
5688 memtodest(const char *p, size_t len, int syntax, int quotes)
5692 q = makestrspace(quotes ? len * 2 : len, q);
5695 unsigned char c = *p++;
5699 int n = SIT(c, syntax);
5700 if (n == CCTL || n == CBACK)
5710 strtodest(const char *p, int syntax, int quotes)
5712 memtodest(p, strlen(p), syntax, quotes);
5716 * Record the fact that we have to scan this region of the
5717 * string for IFS characters.
5720 recordregion(int start, int end, int nulonly)
5722 struct ifsregion *ifsp;
5724 if (ifslastp == NULL) {
5728 ifsp = ckzalloc(sizeof(*ifsp));
5729 /*ifsp->next = NULL; - ckzalloc did it */
5730 ifslastp->next = ifsp;
5734 ifslastp->begoff = start;
5735 ifslastp->endoff = end;
5736 ifslastp->nulonly = nulonly;
5740 removerecordregions(int endoff)
5742 if (ifslastp == NULL)
5745 if (ifsfirst.endoff > endoff) {
5746 while (ifsfirst.next) {
5747 struct ifsregion *ifsp;
5749 ifsp = ifsfirst.next->next;
5750 free(ifsfirst.next);
5751 ifsfirst.next = ifsp;
5754 if (ifsfirst.begoff > endoff) {
5757 ifslastp = &ifsfirst;
5758 ifsfirst.endoff = endoff;
5763 ifslastp = &ifsfirst;
5764 while (ifslastp->next && ifslastp->next->begoff < endoff)
5765 ifslastp = ifslastp->next;
5766 while (ifslastp->next) {
5767 struct ifsregion *ifsp;
5769 ifsp = ifslastp->next->next;
5770 free(ifslastp->next);
5771 ifslastp->next = ifsp;
5774 if (ifslastp->endoff > endoff)
5775 ifslastp->endoff = endoff;
5779 exptilde(char *startp, char *p, int flags)
5785 int quotes = flags & (EXP_FULL | EXP_CASE | EXP_REDIR);
5790 while ((c = *++p) != '\0') {
5797 if (flags & EXP_VARTILDE)
5807 if (*name == '\0') {
5808 home = lookupvar("HOME");
5810 pw = getpwnam(name);
5815 if (!home || !*home)
5818 startloc = expdest - (char *)stackblock();
5819 strtodest(home, SQSYNTAX, quotes);
5820 recordregion(startloc, expdest - (char *)stackblock(), 0);
5828 * Execute a command inside back quotes. If it's a builtin command, we
5829 * want to save its output in a block obtained from malloc. Otherwise
5830 * we fork off a subprocess and get the output of the command via a pipe.
5831 * Should be called with interrupts off.
5833 struct backcmd { /* result of evalbackcmd */
5834 int fd; /* file descriptor to read from */
5835 int nleft; /* number of chars in buffer */
5836 char *buf; /* buffer */
5837 struct job *jp; /* job structure for command */
5840 /* These forward decls are needed to use "eval" code for backticks handling: */
5841 static uint8_t back_exitstatus; /* exit status of backquoted command */
5842 #define EV_EXIT 01 /* exit after evaluating tree */
5843 static void evaltree(union node *, int);
5845 static void FAST_FUNC
5846 evalbackcmd(union node *n, struct backcmd *result)
5857 saveherefd = herefd;
5865 ash_msg_and_raise_error("pipe call failed");
5866 jp = makejob(/*n,*/ 1);
5867 if (forkshell(jp, n, FORK_NOJOB) == 0) {
5872 copyfd(pip[1], 1 | COPYFD_EXACT);
5876 evaltree(n, EV_EXIT); /* actually evaltreenr... */
5880 result->fd = pip[0];
5883 herefd = saveherefd;
5885 TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n",
5886 result->fd, result->buf, result->nleft, result->jp));
5890 * Expand stuff in backwards quotes.
5893 expbackq(union node *cmd, int quoted, int quotes)
5901 int syntax = quoted ? DQSYNTAX : BASESYNTAX;
5902 struct stackmark smark;
5905 setstackmark(&smark);
5907 startloc = dest - (char *)stackblock();
5909 evalbackcmd(cmd, &in);
5910 popstackmark(&smark);
5917 memtodest(p, i, syntax, quotes);
5921 i = nonblock_immune_read(in.fd, buf, sizeof(buf), /*loop_on_EINTR:*/ 1);
5922 TRACE(("expbackq: read returns %d\n", i));
5931 back_exitstatus = waitforjob(in.jp);
5935 /* Eat all trailing newlines */
5937 for (; dest > (char *)stackblock() && dest[-1] == '\n';)
5942 recordregion(startloc, dest - (char *)stackblock(), 0);
5943 TRACE(("evalbackq: size:%d:'%.*s'\n",
5944 (int)((dest - (char *)stackblock()) - startloc),
5945 (int)((dest - (char *)stackblock()) - startloc),
5946 stackblock() + startloc));
5949 #if ENABLE_SH_MATH_SUPPORT
5951 * Expand arithmetic expression. Backup to start of expression,
5952 * evaluate, place result in (backed up) result, adjust string position.
5965 * This routine is slightly over-complicated for
5966 * efficiency. Next we scan backwards looking for the
5967 * start of arithmetic.
5969 start = stackblock();
5976 while ((unsigned char)*p != CTLARI) {
5980 ash_msg_and_raise_error("missing CTLARI (shouldn't happen)");
5985 esc = esclen(start, p);
5995 removerecordregions(begoff);
6002 rmescapes(p + 2, 0);
6004 len = cvtnum(ash_arith(p + 2));
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 CTLBACKQ | CTLQUOTE,
6035 #if ENABLE_SH_MATH_SUPPORT
6040 const char *reject = spclchars;
6041 int quotes = flags & (EXP_FULL | EXP_CASE | EXP_REDIR); /* do CTLESC */
6042 int breakall = flags & EXP_WORD;
6047 if (!(flags & EXP_VARTILDE)) {
6049 } else if (flags & EXP_VARTILDE2) {
6054 if (flags & EXP_TILDE) {
6057 flags &= ~EXP_TILDE;
6060 if ((unsigned char)*q == CTLESC && (flags & EXP_QWORD))
6063 p = exptilde(p, q, flags);
6066 startloc = expdest - (char *)stackblock();
6070 length += strcspn(p + length, reject);
6074 IF_SH_MATH_SUPPORT(|| c == CTLENDARI)
6076 /* c == '=' || c == ':' || c == CTLENDARI */
6082 expdest = stack_nputstr(p, length, expdest);
6083 newloc = expdest - (char *)stackblock();
6084 if (breakall && !inquotes && newloc > startloc) {
6085 recordregion(startloc, newloc, 0);
6096 if (flags & EXP_VARTILDE2) {
6100 flags |= EXP_VARTILDE2;
6105 * sort of a hack - expand tildes in variable
6106 * assignments (after the first '=' and after ':'s).
6115 case CTLENDVAR: /* ??? */
6118 /* "$@" syntax adherence hack */
6120 && memcmp(p, dolatstr, 4) == 0
6121 && ( p[4] == (char)CTLQUOTEMARK
6122 || (p[4] == (char)CTLENDVAR && p[5] == (char)CTLQUOTEMARK)
6125 p = evalvar(p + 1, flags, /* var_str_list: */ NULL) + 1;
6128 inquotes = !inquotes;
6141 p = evalvar(p, flags, var_str_list);
6145 case CTLBACKQ|CTLQUOTE:
6146 expbackq(argbackq->n, c, quotes);
6147 argbackq = argbackq->next;
6149 #if ENABLE_SH_MATH_SUPPORT
6161 scanleft(char *startp, char *rmesc, char *rmescend UNUSED_PARAM,
6162 char *pattern, int quotes, int zero)
6171 const char *s = loc2;
6178 match = pmatch(pattern, s);
6183 if (quotes && (unsigned char)*loc == CTLESC)
6192 scanright(char *startp, char *rmesc, char *rmescend,
6193 char *pattern, int quotes, int match_at_start)
6195 #if !ENABLE_ASH_OPTIMIZE_FOR_SIZE
6196 int try2optimize = match_at_start;
6202 /* If we called by "${v/pattern/repl}" or "${v//pattern/repl}":
6203 * startp="escaped_value_of_v" rmesc="raw_value_of_v"
6204 * rmescend=""(ptr to NUL in rmesc) pattern="pattern" quotes=match_at_start=1
6206 * loc starts at NUL at the end of startp, loc2 starts at the end of rmesc,
6207 * and on each iteration they go back two/one char until they reach the beginning.
6208 * We try to find a match in "raw_value_of_v", "raw_value_of_", "raw_value_of" etc.
6210 /* TODO: document in what other circumstances we are called. */
6212 for (loc = pattern - 1, loc2 = rmescend; loc >= startp; loc2--) {
6215 const char *s = loc2;
6216 if (match_at_start) {
6220 match = pmatch(pattern, s);
6221 //bb_error_msg("pmatch(pattern:'%s',s:'%s'):%d", pattern, s, match);
6225 #if !ENABLE_ASH_OPTIMIZE_FOR_SIZE
6227 /* Maybe we can optimize this:
6228 * if pattern ends with unescaped *, we can avoid checking
6229 * shorter strings: if "foo*" doesnt match "raw_value_of_v",
6230 * it wont match truncated "raw_value_of_" strings too.
6232 unsigned plen = strlen(pattern);
6233 /* Does it end with "*"? */
6234 if (plen != 0 && pattern[--plen] == '*') {
6235 /* "xxxx*" is not escaped */
6236 /* "xxx\*" is escaped */
6237 /* "xx\\*" is not escaped */
6238 /* "x\\\*" is escaped */
6240 while (plen != 0 && pattern[--plen] == '\\')
6243 break; /* ends with unescaped "*" */
6251 esc = esclen(startp, loc);
6262 static void varunset(const char *, const char *, const char *, int) NORETURN;
6264 varunset(const char *end, const char *var, const char *umsg, int varflags)
6270 msg = "parameter not set";
6272 if ((unsigned char)*end == CTLENDVAR) {
6273 if (varflags & VSNUL)
6279 ash_msg_and_raise_error("%.*s: %s%s", (int)(end - var - 1), var, msg, tail);
6282 #if ENABLE_ASH_BASH_COMPAT
6284 parse_sub_pattern(char *arg, int varflags)
6286 char *idx, *repl = NULL;
6289 //char *org_arg = arg;
6290 //bb_error_msg("arg:'%s' varflags:%x", arg, varflags);
6297 /* Only the first '/' seen is our separator */
6306 * Example: v='ab\c'; echo ${v/\\b/_\\_\z_}
6307 * The result is a_\_z_c (not a\_\_z_c)!
6309 * Enable debug prints in this function and you'll see:
6310 * ash: arg:'\\b/_\\_z_' varflags:d
6311 * ash: pattern:'\\b' repl:'_\_z_'
6312 * That is, \\b is interpreted as \\b, but \\_ as \_!
6313 * IOW: search pattern and replace string treat backslashes
6314 * differently! That is the reason why we check repl below:
6316 if (c == '\\' && *arg == '\\' && repl && !(varflags & VSQUOTE))
6317 arg++; /* skip both '\', not just first one */
6320 //bb_error_msg("pattern:'%s' repl:'%s'", org_arg, repl);
6324 #endif /* ENABLE_ASH_BASH_COMPAT */
6327 subevalvar(char *p, char *varname, int strloc, int subtype,
6328 int startloc, int varflags, int quotes, struct strlist *var_str_list)
6330 struct nodelist *saveargbackq = argbackq;
6333 char *rmesc, *rmescend;
6335 IF_ASH_BASH_COMPAT(const char *repl = NULL;)
6336 IF_ASH_BASH_COMPAT(int pos, len, orig_len;)
6337 int saveherefd = herefd;
6338 int amount, workloc, resetloc;
6340 char *(*scan)(char*, char*, char*, char*, int, int);
6342 //bb_error_msg("subevalvar(p:'%s',varname:'%s',strloc:%d,subtype:%d,startloc:%d,varflags:%x,quotes:%d)",
6343 // p, varname, strloc, subtype, startloc, varflags, quotes);
6346 argstr(p, (subtype != VSASSIGN && subtype != VSQUESTION) ? EXP_CASE : 0,
6348 STPUTC('\0', expdest);
6349 herefd = saveherefd;
6350 argbackq = saveargbackq;
6351 startp = (char *)stackblock() + startloc;
6355 setvar(varname, startp, 0);
6356 amount = startp - expdest;
6357 STADJUST(amount, expdest);
6361 varunset(p, varname, startp, varflags);
6364 #if ENABLE_ASH_BASH_COMPAT
6366 loc = str = stackblock() + strloc;
6367 /* Read POS in ${var:POS:LEN} */
6368 pos = atoi(loc); /* number(loc) errors out on "1:4" */
6369 len = str - startp - 1;
6371 /* *loc != '\0', guaranteed by parser */
6375 /* Adjust the length by the number of escapes */
6376 for (ptr = startp; ptr < (str - 1); ptr++) {
6377 if ((unsigned char)*ptr == CTLESC) {
6385 if (*loc++ == ':') {
6389 /* Skip POS in ${var:POS:LEN} */
6391 while (*loc && *loc != ':') {
6393 * bash complains on: var=qwe; echo ${var:1a:123}
6395 ash_msg_and_raise_error(msg_illnum, str);
6399 if (*loc++ == ':') {
6403 if (pos >= orig_len) {
6407 if (len > (orig_len - pos))
6408 len = orig_len - pos;
6410 for (str = startp; pos; str++, pos--) {
6411 if (quotes && (unsigned char)*str == CTLESC)
6414 for (loc = startp; len; len--) {
6415 if (quotes && (unsigned char)*str == CTLESC)
6420 amount = loc - expdest;
6421 STADJUST(amount, expdest);
6426 resetloc = expdest - (char *)stackblock();
6428 /* We'll comeback here if we grow the stack while handling
6429 * a VSREPLACE or VSREPLACEALL, since our pointers into the
6430 * stack will need rebasing, and we'll need to remove our work
6433 IF_ASH_BASH_COMPAT(restart:)
6435 amount = expdest - ((char *)stackblock() + resetloc);
6436 STADJUST(-amount, expdest);
6437 startp = (char *)stackblock() + startloc;
6440 rmescend = (char *)stackblock() + strloc;
6442 rmesc = rmescapes(startp, RMESCAPE_ALLOC | RMESCAPE_GROW);
6443 if (rmesc != startp) {
6445 startp = (char *)stackblock() + startloc;
6449 str = (char *)stackblock() + strloc;
6450 preglob(str, varflags & VSQUOTE, 0);
6451 workloc = expdest - (char *)stackblock();
6453 #if ENABLE_ASH_BASH_COMPAT
6454 if (subtype == VSREPLACE || subtype == VSREPLACEALL) {
6458 repl = parse_sub_pattern(str, varflags);
6459 //bb_error_msg("repl:'%s'", repl);
6464 /* If there's no pattern to match, return the expansion unmolested */
6473 loc = scanright(idx, rmesc, rmescend, str, quotes, 1);
6474 //bb_error_msg("scanright('%s'):'%s'", str, loc);
6476 /* No match, advance */
6477 char *restart_detect = stackblock();
6479 STPUTC(*idx, expdest);
6480 if (quotes && (unsigned char)*idx == CTLESC) {
6483 STPUTC(*idx, expdest);
6485 if (stackblock() != restart_detect)
6490 /* continue; - prone to quadratic behavior, smarter code: */
6493 if (str[0] == '*') {
6494 /* Pattern is "*foo". If "*foo" does not match "long_string",
6495 * it would never match "ong_string" etc, no point in trying.
6502 if (subtype == VSREPLACEALL) {
6504 if (quotes && (unsigned char)*idx == CTLESC)
6513 //bb_error_msg("repl:'%s'", repl);
6514 for (loc = (char*)repl; *loc; loc++) {
6515 char *restart_detect = stackblock();
6516 if (quotes && *loc == '\\') {
6517 STPUTC(CTLESC, expdest);
6520 STPUTC(*loc, expdest);
6521 if (stackblock() != restart_detect)
6526 if (subtype == VSREPLACE) {
6527 //bb_error_msg("tail:'%s', quotes:%x", idx, quotes);
6529 char *restart_detect = stackblock();
6530 STPUTC(*idx, expdest);
6531 if (stackblock() != restart_detect)
6540 /* We've put the replaced text into a buffer at workloc, now
6541 * move it to the right place and adjust the stack.
6543 STPUTC('\0', expdest);
6544 startp = (char *)stackblock() + startloc;
6545 memmove(startp, (char *)stackblock() + workloc, len + 1);
6546 //bb_error_msg("startp:'%s'", startp);
6547 amount = expdest - (startp + len);
6548 STADJUST(-amount, expdest);
6551 #endif /* ENABLE_ASH_BASH_COMPAT */
6553 subtype -= VSTRIMRIGHT;
6555 if (subtype < 0 || subtype > 7)
6558 /* zero = (subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX) */
6559 zero = subtype >> 1;
6560 /* VSTRIMLEFT/VSTRIMRIGHTMAX -> scanleft */
6561 scan = (subtype & 1) ^ zero ? scanleft : scanright;
6563 loc = scan(startp, rmesc, rmescend, str, quotes, zero);
6566 memmove(startp, loc, str - loc);
6567 loc = startp + (str - loc) - 1;
6570 amount = loc - expdest;
6571 STADJUST(amount, expdest);
6577 * Add the value of a specialized variable to the stack string.
6578 * name parameter (examples):
6579 * ash -c 'echo $1' name:'1='
6580 * ash -c 'echo $qwe' name:'qwe='
6581 * ash -c 'echo $$' name:'$='
6582 * ash -c 'echo ${$}' name:'$='
6583 * ash -c 'echo ${$##q}' name:'$=q'
6584 * ash -c 'echo ${#$}' name:'$='
6585 * note: examples with bad shell syntax:
6586 * ash -c 'echo ${#$1}' name:'$=1'
6587 * ash -c 'echo ${#1#}' name:'1=#'
6589 static NOINLINE ssize_t
6590 varvalue(char *name, int varflags, int flags, struct strlist *var_str_list)
6597 int subtype = varflags & VSTYPE;
6598 int quotes = flags & (EXP_FULL | EXP_CASE | EXP_REDIR);
6599 int quoted = varflags & VSQUOTE;
6600 int syntax = quoted ? DQSYNTAX : BASESYNTAX;
6610 num = shellparam.nparam;
6618 goto check_1char_name;
6620 expdest = makestrspace(NOPTS, expdest);
6621 for (i = NOPTS - 1; i >= 0; i--) {
6623 USTPUTC(optletters(i), expdest);
6629 /* handles cases similar to ${#$1} */
6630 if (name[2] != '\0')
6631 raise_error_syntax("bad substitution");
6638 if (quoted && (flags & EXP_FULL)) {
6639 /* note: this is not meant as PEOF value */
6640 sep = 1 << CHAR_BIT;
6645 sep = ifsset() ? (unsigned char)(ifsval()[0]) : ' ';
6646 i = SIT(sep, syntax);
6647 if (quotes && (i == CCTL || i == CBACK))
6653 while ((p = *ap++) != NULL) {
6656 partlen = strlen(p);
6659 if (!(subtype == VSPLUS || subtype == VSLENGTH))
6660 memtodest(p, partlen, syntax, quotes);
6666 if (subtype == VSPLUS || subtype == VSLENGTH) {
6672 /* note: may put NUL despite sep != 0
6673 * (see sep = 1 << CHAR_BIT above) */
6679 } /* case '@' and '*' */
6690 num = atoi(name); /* number(name) fails on ${N#str} etc */
6691 if (num < 0 || num > shellparam.nparam)
6693 p = num ? shellparam.p[num - 1] : arg0;
6696 /* NB: name has form "VAR=..." */
6698 /* "A=a B=$A" case: var_str_list is a list of "A=a" strings
6699 * which should be considered before we check variables. */
6701 unsigned name_len = (strchrnul(name, '=') - name) + 1;
6705 str = var_str_list->text;
6706 eq = strchr(str, '=');
6707 if (!eq) /* stop at first non-assignment */
6710 if (name_len == (unsigned)(eq - str)
6711 && strncmp(str, name, name_len) == 0
6714 /* goto value; - WRONG! */
6715 /* think "A=1 A=2 B=$A" */
6717 var_str_list = var_str_list->next;
6718 } while (var_str_list);
6722 p = lookupvar(name);
6728 if (!(subtype == VSPLUS || subtype == VSLENGTH))
6729 memtodest(p, len, syntax, quotes);
6733 if (subtype == VSPLUS || subtype == VSLENGTH)
6734 STADJUST(-len, expdest);
6739 * Expand a variable, and return a pointer to the next character in the
6743 evalvar(char *p, int flags, struct strlist *var_str_list)
6754 varflags = (unsigned char) *p++;
6755 subtype = varflags & VSTYPE;
6756 quoted = varflags & VSQUOTE;
6758 easy = (!quoted || (*var == '@' && shellparam.nparam));
6759 startloc = expdest - (char *)stackblock();
6760 p = strchr(p, '=') + 1; //TODO: use var_end(p)?
6763 varlen = varvalue(var, varflags, flags, var_str_list);
6764 if (varflags & VSNUL)
6767 if (subtype == VSPLUS) {
6768 varlen = -1 - varlen;
6772 if (subtype == VSMINUS) {
6777 flags | (quoted ? EXP_TILDE|EXP_QWORD : EXP_TILDE|EXP_WORD),
6787 if (subtype == VSASSIGN || subtype == VSQUESTION) {
6789 if (subevalvar(p, var, /* strloc: */ 0,
6790 subtype, startloc, varflags,
6796 * Remove any recorded regions beyond
6799 removerecordregions(startloc);
6809 if (varlen < 0 && uflag)
6810 varunset(p, var, 0, 0);
6812 if (subtype == VSLENGTH) {
6813 cvtnum(varlen > 0 ? varlen : 0);
6817 if (subtype == VSNORMAL) {
6828 case VSTRIMRIGHTMAX:
6829 #if ENABLE_ASH_BASH_COMPAT
6842 * Terminate the string and start recording the pattern
6845 STPUTC('\0', expdest);
6846 patloc = expdest - (char *)stackblock();
6847 if (NULL == subevalvar(p, /* varname: */ NULL, patloc, subtype,
6849 //TODO: | EXP_REDIR too? All other such places do it too
6850 /* quotes: */ flags & (EXP_FULL | EXP_CASE),
6853 int amount = expdest - (
6854 (char *)stackblock() + patloc - 1
6856 STADJUST(-amount, expdest);
6858 /* Remove any recorded regions beyond start of variable */
6859 removerecordregions(startloc);
6861 recordregion(startloc, expdest - (char *)stackblock(), quoted);
6865 if (subtype != VSNORMAL) { /* skip to end of alternative */
6868 unsigned char c = *p++;
6871 else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) {
6873 argbackq = argbackq->next;
6874 } else if (c == CTLVAR) {
6875 if ((*p++ & VSTYPE) != VSNORMAL)
6877 } else if (c == CTLENDVAR) {
6887 * Break the argument string into pieces based upon IFS and add the
6888 * strings to the argument list. The regions of the string to be
6889 * searched for IFS characters have been stored by recordregion.
6892 ifsbreakup(char *string, struct arglist *arglist)
6894 struct ifsregion *ifsp;
6899 const char *ifs, *realifs;
6904 if (ifslastp != NULL) {
6907 realifs = ifsset() ? ifsval() : defifs;
6910 p = string + ifsp->begoff;
6911 nulonly = ifsp->nulonly;
6912 ifs = nulonly ? nullstr : realifs;
6914 while (p < string + ifsp->endoff) {
6916 if ((unsigned char)*p == CTLESC)
6918 if (!strchr(ifs, *p)) {
6923 ifsspc = (strchr(defifs, *p) != NULL);
6924 /* Ignore IFS whitespace at start */
6925 if (q == start && ifsspc) {
6931 sp = stzalloc(sizeof(*sp));
6933 *arglist->lastp = sp;
6934 arglist->lastp = &sp->next;
6938 if (p >= string + ifsp->endoff) {
6942 if ((unsigned char)*p == CTLESC)
6944 if (strchr(ifs, *p) == NULL) {
6948 if (strchr(defifs, *p) == NULL) {
6963 } while (ifsp != NULL);
6972 sp = stzalloc(sizeof(*sp));
6974 *arglist->lastp = sp;
6975 arglist->lastp = &sp->next;
6981 struct ifsregion *p;
6986 struct ifsregion *ifsp;
6992 ifsfirst.next = NULL;
6997 * Add a file name to the list.
7000 addfname(const char *name)
7004 sp = stzalloc(sizeof(*sp));
7005 sp->text = ststrdup(name);
7007 exparg.lastp = &sp->next;
7011 * Do metacharacter (i.e. *, ?, [...]) expansion.
7014 expmeta(char *expdir, char *enddir, char *name)
7029 for (p = name; *p; p++) {
7030 if (*p == '*' || *p == '?')
7032 else if (*p == '[') {
7039 if (*q == '/' || *q == '\0')
7046 } else if (*p == '\\')
7048 else if (*p == '/') {
7055 if (metaflag == 0) { /* we've reached the end of the file name */
7056 if (enddir != expdir)
7064 if (metaflag == 0 || lstat(expdir, &statb) >= 0)
7075 } while (p < start);
7077 if (enddir == expdir) {
7079 } else if (enddir == expdir + 1 && *expdir == '/') {
7088 if (enddir != expdir)
7090 if (*endname == 0) {
7102 while (!pending_int && (dp = readdir(dirp)) != NULL) {
7103 if (dp->d_name[0] == '.' && !matchdot)
7105 if (pmatch(start, dp->d_name)) {
7107 strcpy(enddir, dp->d_name);
7110 for (p = enddir, cp = dp->d_name; (*p++ = *cp++) != '\0';)
7113 expmeta(expdir, p, endname);
7122 static struct strlist *
7123 msort(struct strlist *list, int len)
7125 struct strlist *p, *q = NULL;
7126 struct strlist **lpp;
7134 for (n = half; --n >= 0;) {
7138 q->next = NULL; /* terminate first half of list */
7139 q = msort(list, half); /* sort first half of list */
7140 p = msort(p, len - half); /* sort second half */
7143 #if ENABLE_LOCALE_SUPPORT
7144 if (strcoll(p->text, q->text) < 0)
7146 if (strcmp(p->text, q->text) < 0)
7170 * Sort the results of file name expansion. It calculates the number of
7171 * strings to sort and then calls msort (short for merge sort) to do the
7174 static struct strlist *
7175 expsort(struct strlist *str)
7181 for (sp = str; sp; sp = sp->next)
7183 return msort(str, len);
7187 expandmeta(struct strlist *str /*, int flag*/)
7189 static const char metachars[] ALIGN1 = {
7192 /* TODO - EXP_REDIR */
7196 struct strlist **savelastp;
7202 if (!strpbrk(str->text, metachars))
7204 savelastp = exparg.lastp;
7207 p = preglob(str->text, 0, RMESCAPE_ALLOC | RMESCAPE_HEAP);
7209 int i = strlen(str->text);
7210 expdir = ckmalloc(i < 2048 ? 2048 : i); /* XXX */
7212 expmeta(expdir, expdir, p);
7217 if (exparg.lastp == savelastp) {
7222 *exparg.lastp = str;
7223 rmescapes(str->text, 0);
7224 exparg.lastp = &str->next;
7226 *exparg.lastp = NULL;
7227 *savelastp = sp = expsort(*savelastp);
7228 while (sp->next != NULL)
7230 exparg.lastp = &sp->next;
7237 * Perform variable substitution and command substitution on an argument,
7238 * placing the resulting list of arguments in arglist. If EXP_FULL is true,
7239 * perform splitting and file name expansion. When arglist is NULL, perform
7240 * here document expansion.
7243 expandarg(union node *arg, struct arglist *arglist, int flag)
7248 argbackq = arg->narg.backquote;
7249 STARTSTACKSTR(expdest);
7250 ifsfirst.next = NULL;
7252 argstr(arg->narg.text, flag,
7253 /* var_str_list: */ arglist ? arglist->list : NULL);
7254 p = _STPUTC('\0', expdest);
7256 if (arglist == NULL) {
7257 return; /* here document expanded */
7259 p = grabstackstr(p);
7260 exparg.lastp = &exparg.list;
7264 if (flag & EXP_FULL) {
7265 ifsbreakup(p, &exparg);
7266 *exparg.lastp = NULL;
7267 exparg.lastp = &exparg.list;
7268 expandmeta(exparg.list /*, flag*/);
7270 if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */
7272 sp = stzalloc(sizeof(*sp));
7275 exparg.lastp = &sp->next;
7279 *exparg.lastp = NULL;
7281 *arglist->lastp = exparg.list;
7282 arglist->lastp = exparg.lastp;
7287 * Expand shell variables and backquotes inside a here document.
7290 expandhere(union node *arg, int fd)
7293 expandarg(arg, (struct arglist *)NULL, 0);
7294 full_write(fd, stackblock(), expdest - (char *)stackblock());
7298 * Returns true if the pattern matches the string.
7301 patmatch(char *pattern, const char *string)
7303 return pmatch(preglob(pattern, 0, 0), string);
7307 * See if a pattern matches in a case statement.
7310 casematch(union node *pattern, char *val)
7312 struct stackmark smark;
7315 setstackmark(&smark);
7316 argbackq = pattern->narg.backquote;
7317 STARTSTACKSTR(expdest);
7319 argstr(pattern->narg.text, EXP_TILDE | EXP_CASE,
7320 /* var_str_list: */ NULL);
7321 STACKSTRNUL(expdest);
7322 result = patmatch(stackblock(), val);
7323 popstackmark(&smark);
7328 /* ============ find_command */
7332 int (*builtin)(int, char **) FAST_FUNC;
7333 /* unsigned flags; */
7335 #define IS_BUILTIN_SPECIAL(b) ((b)->name[0] & 1)
7336 /* "regular" builtins always take precedence over commands,
7337 * regardless of PATH=....%builtin... position */
7338 #define IS_BUILTIN_REGULAR(b) ((b)->name[0] & 2)
7339 #define IS_BUILTIN_ASSIGN(b) ((b)->name[0] & 4)
7342 smallint cmdtype; /* CMDxxx */
7345 /* index >= 0 for commands without path (slashes) */
7346 /* (TODO: what exactly does the value mean? PATH position?) */
7347 /* index == -1 for commands with slashes */
7348 /* index == (-2 - applet_no) for NOFORK applets */
7349 const struct builtincmd *cmd;
7350 struct funcnode *func;
7353 /* values of cmdtype */
7354 #define CMDUNKNOWN -1 /* no entry in table for command */
7355 #define CMDNORMAL 0 /* command is an executable program */
7356 #define CMDFUNCTION 1 /* command is a shell function */
7357 #define CMDBUILTIN 2 /* command is a shell builtin */
7359 /* action to find_command() */
7360 #define DO_ERR 0x01 /* prints errors */
7361 #define DO_ABS 0x02 /* checks absolute paths */
7362 #define DO_NOFUNC 0x04 /* don't return shell functions, for command */
7363 #define DO_ALTPATH 0x08 /* using alternate path */
7364 #define DO_ALTBLTIN 0x20 /* %builtin in alt. path */
7366 static void find_command(char *, struct cmdentry *, int, const char *);
7369 /* ============ Hashing commands */
7372 * When commands are first encountered, they are entered in a hash table.
7373 * This ensures that a full path search will not have to be done for them
7374 * on each invocation.
7376 * We should investigate converting to a linear search, even though that
7377 * would make the command name "hash" a misnomer.
7381 struct tblentry *next; /* next entry in hash chain */
7382 union param param; /* definition of builtin function */
7383 smallint cmdtype; /* CMDxxx */
7384 char rehash; /* if set, cd done since entry created */
7385 char cmdname[1]; /* name of command */
7388 static struct tblentry **cmdtable;
7389 #define INIT_G_cmdtable() do { \
7390 cmdtable = xzalloc(CMDTABLESIZE * sizeof(cmdtable[0])); \
7393 static int builtinloc = -1; /* index in path of %builtin, or -1 */
7397 tryexec(IF_FEATURE_SH_STANDALONE(int applet_no,) char *cmd, char **argv, char **envp)
7399 #if ENABLE_FEATURE_SH_STANDALONE
7400 if (applet_no >= 0) {
7401 if (APPLET_IS_NOEXEC(applet_no)) {
7405 run_applet_no_and_exit(applet_no, argv);
7407 /* re-exec ourselves with the new arguments */
7408 execve(bb_busybox_exec_path, argv, envp);
7409 /* If they called chroot or otherwise made the binary no longer
7410 * executable, fall through */
7417 execve(cmd, argv, envp);
7418 } while (errno == EINTR);
7420 execve(cmd, argv, envp);
7422 if (cmd == (char*) bb_busybox_exec_path) {
7423 /* We already visited ENOEXEC branch below, don't do it again */
7424 //TODO: try execve(initial_argv0_of_shell, argv, envp) before giving up?
7428 if (errno == ENOEXEC) {
7429 /* Run "cmd" as a shell script:
7430 * http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html
7431 * "If the execve() function fails with ENOEXEC, the shell
7432 * shall execute a command equivalent to having a shell invoked
7433 * with the command name as its first operand,
7434 * with any remaining arguments passed to the new shell"
7436 * That is, do not use $SHELL, user's shell, or /bin/sh;
7437 * just call ourselves.
7442 for (ap = argv; *ap; ap++)
7444 new = ckmalloc((ap - argv + 2) * sizeof(new[0]));
7445 new[0] = (char*) "ash";
7448 while ((*ap++ = *++argv) != NULL)
7450 cmd = (char*) bb_busybox_exec_path;
7457 * Exec a program. Never returns. If you change this routine, you may
7458 * have to change the find_command routine as well.
7460 static void shellexec(char **, const char *, int) NORETURN;
7462 shellexec(char **argv, const char *path, int idx)
7468 #if ENABLE_FEATURE_SH_STANDALONE
7472 clearredir(/*drop:*/ 1);
7473 envp = listvars(VEXPORT, VUNSET, /*end:*/ NULL);
7474 if (strchr(argv[0], '/') != NULL
7475 #if ENABLE_FEATURE_SH_STANDALONE
7476 || (applet_no = find_applet_by_name(argv[0])) >= 0
7479 tryexec(IF_FEATURE_SH_STANDALONE(applet_no,) argv[0], argv, envp);
7483 while ((cmdname = path_advance(&path, argv[0])) != NULL) {
7484 if (--idx < 0 && pathopt == NULL) {
7485 tryexec(IF_FEATURE_SH_STANDALONE(-1,) cmdname, argv, envp);
7486 if (errno != ENOENT && errno != ENOTDIR)
7493 /* Map to POSIX errors */
7505 exitstatus = exerrno;
7506 TRACE(("shellexec failed for %s, errno %d, suppress_int %d\n",
7507 argv[0], e, suppress_int));
7508 ash_msg_and_raise(EXEXEC, "%s: %s", argv[0], errmsg(e, "not found"));
7513 printentry(struct tblentry *cmdp)
7519 idx = cmdp->param.index;
7522 name = path_advance(&path, cmdp->cmdname);
7524 } while (--idx >= 0);
7525 out1fmt("%s%s\n", name, (cmdp->rehash ? "*" : nullstr));
7529 * Clear out command entries. The argument specifies the first entry in
7530 * PATH which has changed.
7533 clearcmdentry(int firstchange)
7535 struct tblentry **tblp;
7536 struct tblentry **pp;
7537 struct tblentry *cmdp;
7540 for (tblp = cmdtable; tblp < &cmdtable[CMDTABLESIZE]; tblp++) {
7542 while ((cmdp = *pp) != NULL) {
7543 if ((cmdp->cmdtype == CMDNORMAL &&
7544 cmdp->param.index >= firstchange)
7545 || (cmdp->cmdtype == CMDBUILTIN &&
7546 builtinloc >= firstchange)
7559 * Locate a command in the command hash table. If "add" is nonzero,
7560 * add the command to the table if it is not already present. The
7561 * variable "lastcmdentry" is set to point to the address of the link
7562 * pointing to the entry, so that delete_cmd_entry can delete the
7565 * Interrupts must be off if called with add != 0.
7567 static struct tblentry **lastcmdentry;
7569 static struct tblentry *
7570 cmdlookup(const char *name, int add)
7572 unsigned int hashval;
7574 struct tblentry *cmdp;
7575 struct tblentry **pp;
7578 hashval = (unsigned char)*p << 4;
7580 hashval += (unsigned char)*p++;
7582 pp = &cmdtable[hashval % CMDTABLESIZE];
7583 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7584 if (strcmp(cmdp->cmdname, name) == 0)
7588 if (add && cmdp == NULL) {
7589 cmdp = *pp = ckzalloc(sizeof(struct tblentry)
7591 /* + 1 - already done because
7592 * tblentry::cmdname is char[1] */);
7593 /*cmdp->next = NULL; - ckzalloc did it */
7594 cmdp->cmdtype = CMDUNKNOWN;
7595 strcpy(cmdp->cmdname, name);
7602 * Delete the command entry returned on the last lookup.
7605 delete_cmd_entry(void)
7607 struct tblentry *cmdp;
7610 cmdp = *lastcmdentry;
7611 *lastcmdentry = cmdp->next;
7612 if (cmdp->cmdtype == CMDFUNCTION)
7613 freefunc(cmdp->param.func);
7619 * Add a new command entry, replacing any existing command entry for
7620 * the same name - except special builtins.
7623 addcmdentry(char *name, struct cmdentry *entry)
7625 struct tblentry *cmdp;
7627 cmdp = cmdlookup(name, 1);
7628 if (cmdp->cmdtype == CMDFUNCTION) {
7629 freefunc(cmdp->param.func);
7631 cmdp->cmdtype = entry->cmdtype;
7632 cmdp->param = entry->u;
7636 static int FAST_FUNC
7637 hashcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
7639 struct tblentry **pp;
7640 struct tblentry *cmdp;
7642 struct cmdentry entry;
7645 if (nextopt("r") != '\0') {
7650 if (*argptr == NULL) {
7651 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
7652 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7653 if (cmdp->cmdtype == CMDNORMAL)
7661 while ((name = *argptr) != NULL) {
7662 cmdp = cmdlookup(name, 0);
7664 && (cmdp->cmdtype == CMDNORMAL
7665 || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))
7669 find_command(name, &entry, DO_ERR, pathval());
7670 if (entry.cmdtype == CMDUNKNOWN)
7678 * Called when a cd is done. Marks all commands so the next time they
7679 * are executed they will be rehashed.
7684 struct tblentry **pp;
7685 struct tblentry *cmdp;
7687 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
7688 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7689 if (cmdp->cmdtype == CMDNORMAL
7690 || (cmdp->cmdtype == CMDBUILTIN
7691 && !IS_BUILTIN_REGULAR(cmdp->param.cmd)
7701 * Fix command hash table when PATH changed.
7702 * Called before PATH is changed. The argument is the new value of PATH;
7703 * pathval() still returns the old value at this point.
7704 * Called with interrupts off.
7706 static void FAST_FUNC
7707 changepath(const char *new)
7715 firstchange = 9999; /* assume no change */
7721 if ((*old == '\0' && *new == ':')
7722 || (*old == ':' && *new == '\0')
7726 old = new; /* ignore subsequent differences */
7730 if (*new == '%' && idx_bltin < 0 && prefix(new + 1, "builtin"))
7737 if (builtinloc < 0 && idx_bltin >= 0)
7738 builtinloc = idx_bltin; /* zap builtins */
7739 if (builtinloc >= 0 && idx_bltin < 0)
7741 clearcmdentry(firstchange);
7742 builtinloc = idx_bltin;
7757 #define TENDBQUOTE 12
7774 typedef smallint token_id_t;
7776 /* first char is indicating which tokens mark the end of a list */
7777 static const char *const tokname_array[] = {
7791 #define KWDOFFSET 13
7792 /* the following are keywords */
7811 /* Wrapper around strcmp for qsort/bsearch/... */
7813 pstrcmp(const void *a, const void *b)
7815 return strcmp((char*) a, (*(char**) b) + 1);
7818 static const char *const *
7819 findkwd(const char *s)
7821 return bsearch(s, tokname_array + KWDOFFSET,
7822 ARRAY_SIZE(tokname_array) - KWDOFFSET,
7823 sizeof(tokname_array[0]), pstrcmp);
7827 * Locate and print what a word is...
7830 describe_command(char *command, int describe_command_verbose)
7832 struct cmdentry entry;
7833 struct tblentry *cmdp;
7834 #if ENABLE_ASH_ALIAS
7835 const struct alias *ap;
7837 const char *path = pathval();
7839 if (describe_command_verbose) {
7843 /* First look at the keywords */
7844 if (findkwd(command)) {
7845 out1str(describe_command_verbose ? " is a shell keyword" : command);
7849 #if ENABLE_ASH_ALIAS
7850 /* Then look at the aliases */
7851 ap = lookupalias(command, 0);
7853 if (!describe_command_verbose) {
7858 out1fmt(" is an alias for %s", ap->val);
7862 /* Then check if it is a tracked alias */
7863 cmdp = cmdlookup(command, 0);
7865 entry.cmdtype = cmdp->cmdtype;
7866 entry.u = cmdp->param;
7868 /* Finally use brute force */
7869 find_command(command, &entry, DO_ABS, path);
7872 switch (entry.cmdtype) {
7874 int j = entry.u.index;
7880 p = path_advance(&path, command);
7884 if (describe_command_verbose) {
7886 (cmdp ? " a tracked alias for" : nullstr), p
7895 if (describe_command_verbose) {
7896 out1str(" is a shell function");
7903 if (describe_command_verbose) {
7904 out1fmt(" is a %sshell builtin",
7905 IS_BUILTIN_SPECIAL(entry.u.cmd) ?
7906 "special " : nullstr
7914 if (describe_command_verbose) {
7915 out1str(": not found\n");
7924 static int FAST_FUNC
7925 typecmd(int argc UNUSED_PARAM, char **argv)
7931 /* type -p ... ? (we don't bother checking for 'p') */
7932 if (argv[1] && argv[1][0] == '-') {
7937 err |= describe_command(argv[i++], verbose);
7942 #if ENABLE_ASH_CMDCMD
7943 static int FAST_FUNC
7944 commandcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
7952 while ((c = nextopt("pvV")) != '\0')
7954 verify |= VERIFY_VERBOSE;
7956 verify |= VERIFY_BRIEF;
7961 /* Mimic bash: just "command -v" doesn't complain, it's a nop */
7962 if (verify && (*argptr != NULL)) {
7963 return describe_command(*argptr, verify - VERIFY_BRIEF);
7971 /* ============ eval.c */
7973 static int funcblocksize; /* size of structures in function */
7974 static int funcstringsize; /* size of strings in node */
7975 static void *funcblock; /* block to allocate function from */
7976 static char *funcstring; /* block to allocate strings from */
7978 /* flags in argument to evaltree */
7979 #define EV_EXIT 01 /* exit after evaluating tree */
7980 #define EV_TESTED 02 /* exit status is checked; ignore -e flag */
7981 #define EV_BACKCMD 04 /* command executing within back quotes */
7983 static const uint8_t nodesize[N_NUMBER] = {
7984 [NCMD ] = SHELL_ALIGN(sizeof(struct ncmd)),
7985 [NPIPE ] = SHELL_ALIGN(sizeof(struct npipe)),
7986 [NREDIR ] = SHELL_ALIGN(sizeof(struct nredir)),
7987 [NBACKGND ] = SHELL_ALIGN(sizeof(struct nredir)),
7988 [NSUBSHELL] = SHELL_ALIGN(sizeof(struct nredir)),
7989 [NAND ] = SHELL_ALIGN(sizeof(struct nbinary)),
7990 [NOR ] = SHELL_ALIGN(sizeof(struct nbinary)),
7991 [NSEMI ] = SHELL_ALIGN(sizeof(struct nbinary)),
7992 [NIF ] = SHELL_ALIGN(sizeof(struct nif)),
7993 [NWHILE ] = SHELL_ALIGN(sizeof(struct nbinary)),
7994 [NUNTIL ] = SHELL_ALIGN(sizeof(struct nbinary)),
7995 [NFOR ] = SHELL_ALIGN(sizeof(struct nfor)),
7996 [NCASE ] = SHELL_ALIGN(sizeof(struct ncase)),
7997 [NCLIST ] = SHELL_ALIGN(sizeof(struct nclist)),
7998 [NDEFUN ] = SHELL_ALIGN(sizeof(struct narg)),
7999 [NARG ] = SHELL_ALIGN(sizeof(struct narg)),
8000 [NTO ] = SHELL_ALIGN(sizeof(struct nfile)),
8001 #if ENABLE_ASH_BASH_COMPAT
8002 [NTO2 ] = SHELL_ALIGN(sizeof(struct nfile)),
8004 [NCLOBBER ] = SHELL_ALIGN(sizeof(struct nfile)),
8005 [NFROM ] = SHELL_ALIGN(sizeof(struct nfile)),
8006 [NFROMTO ] = SHELL_ALIGN(sizeof(struct nfile)),
8007 [NAPPEND ] = SHELL_ALIGN(sizeof(struct nfile)),
8008 [NTOFD ] = SHELL_ALIGN(sizeof(struct ndup)),
8009 [NFROMFD ] = SHELL_ALIGN(sizeof(struct ndup)),
8010 [NHERE ] = SHELL_ALIGN(sizeof(struct nhere)),
8011 [NXHERE ] = SHELL_ALIGN(sizeof(struct nhere)),
8012 [NNOT ] = SHELL_ALIGN(sizeof(struct nnot)),
8015 static void calcsize(union node *n);
8018 sizenodelist(struct nodelist *lp)
8021 funcblocksize += SHELL_ALIGN(sizeof(struct nodelist));
8028 calcsize(union node *n)
8032 funcblocksize += nodesize[n->type];
8035 calcsize(n->ncmd.redirect);
8036 calcsize(n->ncmd.args);
8037 calcsize(n->ncmd.assign);
8040 sizenodelist(n->npipe.cmdlist);
8045 calcsize(n->nredir.redirect);
8046 calcsize(n->nredir.n);
8053 calcsize(n->nbinary.ch2);
8054 calcsize(n->nbinary.ch1);
8057 calcsize(n->nif.elsepart);
8058 calcsize(n->nif.ifpart);
8059 calcsize(n->nif.test);
8062 funcstringsize += strlen(n->nfor.var) + 1;
8063 calcsize(n->nfor.body);
8064 calcsize(n->nfor.args);
8067 calcsize(n->ncase.cases);
8068 calcsize(n->ncase.expr);
8071 calcsize(n->nclist.body);
8072 calcsize(n->nclist.pattern);
8073 calcsize(n->nclist.next);
8077 sizenodelist(n->narg.backquote);
8078 funcstringsize += strlen(n->narg.text) + 1;
8079 calcsize(n->narg.next);
8082 #if ENABLE_ASH_BASH_COMPAT
8089 calcsize(n->nfile.fname);
8090 calcsize(n->nfile.next);
8094 calcsize(n->ndup.vname);
8095 calcsize(n->ndup.next);
8099 calcsize(n->nhere.doc);
8100 calcsize(n->nhere.next);
8103 calcsize(n->nnot.com);
8109 nodeckstrdup(char *s)
8111 char *rtn = funcstring;
8113 strcpy(funcstring, s);
8114 funcstring += strlen(s) + 1;
8118 static union node *copynode(union node *);
8120 static struct nodelist *
8121 copynodelist(struct nodelist *lp)
8123 struct nodelist *start;
8124 struct nodelist **lpp;
8129 funcblock = (char *) funcblock + SHELL_ALIGN(sizeof(struct nodelist));
8130 (*lpp)->n = copynode(lp->n);
8132 lpp = &(*lpp)->next;
8139 copynode(union node *n)
8146 funcblock = (char *) funcblock + nodesize[n->type];
8150 new->ncmd.redirect = copynode(n->ncmd.redirect);
8151 new->ncmd.args = copynode(n->ncmd.args);
8152 new->ncmd.assign = copynode(n->ncmd.assign);
8155 new->npipe.cmdlist = copynodelist(n->npipe.cmdlist);
8156 new->npipe.pipe_backgnd = n->npipe.pipe_backgnd;
8161 new->nredir.redirect = copynode(n->nredir.redirect);
8162 new->nredir.n = copynode(n->nredir.n);
8169 new->nbinary.ch2 = copynode(n->nbinary.ch2);
8170 new->nbinary.ch1 = copynode(n->nbinary.ch1);
8173 new->nif.elsepart = copynode(n->nif.elsepart);
8174 new->nif.ifpart = copynode(n->nif.ifpart);
8175 new->nif.test = copynode(n->nif.test);
8178 new->nfor.var = nodeckstrdup(n->nfor.var);
8179 new->nfor.body = copynode(n->nfor.body);
8180 new->nfor.args = copynode(n->nfor.args);
8183 new->ncase.cases = copynode(n->ncase.cases);
8184 new->ncase.expr = copynode(n->ncase.expr);
8187 new->nclist.body = copynode(n->nclist.body);
8188 new->nclist.pattern = copynode(n->nclist.pattern);
8189 new->nclist.next = copynode(n->nclist.next);
8193 new->narg.backquote = copynodelist(n->narg.backquote);
8194 new->narg.text = nodeckstrdup(n->narg.text);
8195 new->narg.next = copynode(n->narg.next);
8198 #if ENABLE_ASH_BASH_COMPAT
8205 new->nfile.fname = copynode(n->nfile.fname);
8206 new->nfile.fd = n->nfile.fd;
8207 new->nfile.next = copynode(n->nfile.next);
8211 new->ndup.vname = copynode(n->ndup.vname);
8212 new->ndup.dupfd = n->ndup.dupfd;
8213 new->ndup.fd = n->ndup.fd;
8214 new->ndup.next = copynode(n->ndup.next);
8218 new->nhere.doc = copynode(n->nhere.doc);
8219 new->nhere.fd = n->nhere.fd;
8220 new->nhere.next = copynode(n->nhere.next);
8223 new->nnot.com = copynode(n->nnot.com);
8226 new->type = n->type;
8231 * Make a copy of a parse tree.
8233 static struct funcnode *
8234 copyfunc(union node *n)
8239 funcblocksize = offsetof(struct funcnode, n);
8242 blocksize = funcblocksize;
8243 f = ckmalloc(blocksize + funcstringsize);
8244 funcblock = (char *) f + offsetof(struct funcnode, n);
8245 funcstring = (char *) f + blocksize;
8252 * Define a shell function.
8255 defun(char *name, union node *func)
8257 struct cmdentry entry;
8260 entry.cmdtype = CMDFUNCTION;
8261 entry.u.func = copyfunc(func);
8262 addcmdentry(name, &entry);
8266 /* Reasons for skipping commands (see comment on breakcmd routine) */
8267 #define SKIPBREAK (1 << 0)
8268 #define SKIPCONT (1 << 1)
8269 #define SKIPFUNC (1 << 2)
8270 #define SKIPFILE (1 << 3)
8271 #define SKIPEVAL (1 << 4)
8272 static smallint evalskip; /* set to SKIPxxx if we are skipping commands */
8273 static int skipcount; /* number of levels to skip */
8274 static int funcnest; /* depth of function calls */
8275 static int loopnest; /* current loop nesting level */
8277 /* Forward decl way out to parsing code - dotrap needs it */
8278 static int evalstring(char *s, int mask);
8280 /* Called to execute a trap.
8281 * Single callsite - at the end of evaltree().
8282 * If we return non-zero, evaltree raises EXEXIT exception.
8284 * Perhaps we should avoid entering new trap handlers
8285 * while we are executing a trap handler. [is it a TODO?]
8294 savestatus = exitstatus;
8298 TRACE(("dotrap entered\n"));
8299 for (sig = 1, g = gotsig; sig < NSIG; sig++, g++) {
8306 /* non-trapped SIGINT is handled separately by raise_interrupt,
8307 * don't upset it by resetting gotsig[SIGINT-1] */
8308 if (sig == SIGINT && !t)
8311 TRACE(("sig %d is active, will run handler '%s'\n", sig, t));
8315 want_exexit = evalstring(t, SKIPEVAL);
8316 exitstatus = savestatus;
8318 TRACE(("dotrap returns %d\n", want_exexit));
8323 TRACE(("dotrap returns 0\n"));
8327 /* forward declarations - evaluation is fairly recursive business... */
8328 static void evalloop(union node *, int);
8329 static void evalfor(union node *, int);
8330 static void evalcase(union node *, int);
8331 static void evalsubshell(union node *, int);
8332 static void expredir(union node *);
8333 static void evalpipe(union node *, int);
8334 static void evalcommand(union node *, int);
8335 static int evalbltin(const struct builtincmd *, int, char **);
8336 static void prehash(union node *);
8339 * Evaluate a parse tree. The value is left in the global variable
8343 evaltree(union node *n, int flags)
8345 struct jmploc *volatile savehandler = exception_handler;
8346 struct jmploc jmploc;
8348 void (*evalfn)(union node *, int);
8352 SAVE_INT(int_level);
8355 TRACE(("evaltree(NULL) called\n"));
8358 TRACE(("evaltree(%p: %d, %d) called\n", n, n->type, flags));
8360 exception_handler = &jmploc;
8362 int err = setjmp(jmploc.loc);
8364 /* if it was a signal, check for trap handlers */
8365 if (exception_type == EXSIG) {
8366 TRACE(("exception %d (EXSIG) in evaltree, err=%d\n",
8367 exception_type, err));
8370 /* continue on the way out */
8371 TRACE(("exception %d in evaltree, propagating err=%d\n",
8372 exception_type, err));
8373 exception_handler = savehandler;
8374 longjmp(exception_handler->loc, err);
8381 out1fmt("Node type = %d\n", n->type);
8386 evaltree(n->nnot.com, EV_TESTED);
8387 status = !exitstatus;
8390 expredir(n->nredir.redirect);
8391 status = redirectsafe(n->nredir.redirect, REDIR_PUSH);
8393 evaltree(n->nredir.n, flags & EV_TESTED);
8394 status = exitstatus;
8396 popredir(/*drop:*/ 0, /*restore:*/ 0 /* not sure */);
8399 evalfn = evalcommand;
8401 if (eflag && !(flags & EV_TESTED))
8413 evalfn = evalsubshell;
8426 #error NAND + 1 != NOR
8428 #if NOR + 1 != NSEMI
8429 #error NOR + 1 != NSEMI
8431 unsigned is_or = n->type - NAND;
8434 (flags | ((is_or >> 1) - 1)) & EV_TESTED
8436 if (!exitstatus == is_or)
8449 evaltree(n->nif.test, EV_TESTED);
8452 if (exitstatus == 0) {
8456 if (n->nif.elsepart) {
8457 n = n->nif.elsepart;
8462 defun(n->narg.text, n->narg.next);
8466 exitstatus = status;
8471 exception_handler = savehandler;
8474 /* Order of checks below is important:
8475 * signal handlers trigger before exit caused by "set -e".
8477 if (pending_sig && dotrap())
8479 if (checkexit & exitstatus)
8480 evalskip |= SKIPEVAL;
8482 if (flags & EV_EXIT) {
8484 raise_exception(EXEXIT);
8487 RESTORE_INT(int_level);
8488 TRACE(("leaving evaltree (no interrupts)\n"));
8491 #if !defined(__alpha__) || (defined(__GNUC__) && __GNUC__ >= 3)
8494 void evaltreenr(union node *, int) __attribute__ ((alias("evaltree"),__noreturn__));
8497 evalloop(union node *n, int flags)
8507 evaltree(n->nbinary.ch1, EV_TESTED);
8510 if (evalskip == SKIPCONT && --skipcount <= 0) {
8514 if (evalskip == SKIPBREAK && --skipcount <= 0)
8519 if (n->type != NWHILE)
8523 evaltree(n->nbinary.ch2, flags);
8524 status = exitstatus;
8529 exitstatus = status;
8533 evalfor(union node *n, int flags)
8535 struct arglist arglist;
8538 struct stackmark smark;
8540 setstackmark(&smark);
8541 arglist.list = NULL;
8542 arglist.lastp = &arglist.list;
8543 for (argp = n->nfor.args; argp; argp = argp->narg.next) {
8544 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE | EXP_RECORD);
8549 *arglist.lastp = NULL;
8554 for (sp = arglist.list; sp; sp = sp->next) {
8555 setvar(n->nfor.var, sp->text, 0);
8556 evaltree(n->nfor.body, flags);
8558 if (evalskip == SKIPCONT && --skipcount <= 0) {
8562 if (evalskip == SKIPBREAK && --skipcount <= 0)
8569 popstackmark(&smark);
8573 evalcase(union node *n, int flags)
8577 struct arglist arglist;
8578 struct stackmark smark;
8580 setstackmark(&smark);
8581 arglist.list = NULL;
8582 arglist.lastp = &arglist.list;
8583 expandarg(n->ncase.expr, &arglist, EXP_TILDE);
8585 for (cp = n->ncase.cases; cp && evalskip == 0; cp = cp->nclist.next) {
8586 for (patp = cp->nclist.pattern; patp; patp = patp->narg.next) {
8587 if (casematch(patp, arglist.list->text)) {
8588 if (evalskip == 0) {
8589 evaltree(cp->nclist.body, flags);
8596 popstackmark(&smark);
8600 * Kick off a subshell to evaluate a tree.
8603 evalsubshell(union node *n, int flags)
8606 int backgnd = (n->type == NBACKGND);
8609 expredir(n->nredir.redirect);
8610 if (!backgnd && (flags & EV_EXIT) && !may_have_traps)
8613 jp = makejob(/*n,*/ 1);
8614 if (forkshell(jp, n, backgnd) == 0) {
8619 flags &= ~EV_TESTED;
8621 redirect(n->nredir.redirect, 0);
8622 evaltreenr(n->nredir.n, flags);
8627 status = waitforjob(jp);
8628 exitstatus = status;
8633 * Compute the names of the files in a redirection list.
8635 static void fixredir(union node *, const char *, int);
8637 expredir(union node *n)
8641 for (redir = n; redir; redir = redir->nfile.next) {
8645 fn.lastp = &fn.list;
8646 switch (redir->type) {
8650 #if ENABLE_ASH_BASH_COMPAT
8655 expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR);
8656 #if ENABLE_ASH_BASH_COMPAT
8659 redir->nfile.expfname = fn.list->text;
8662 case NTOFD: /* >& */
8663 if (redir->ndup.vname) {
8664 expandarg(redir->ndup.vname, &fn, EXP_FULL | EXP_TILDE);
8665 if (fn.list == NULL)
8666 ash_msg_and_raise_error("redir error");
8667 #if ENABLE_ASH_BASH_COMPAT
8668 //FIXME: we used expandarg with different args!
8669 if (!isdigit_str9(fn.list->text)) {
8670 /* >&file, not >&fd */
8671 if (redir->nfile.fd != 1) /* 123>&file - BAD */
8672 ash_msg_and_raise_error("redir error");
8674 goto store_expfname;
8677 fixredir(redir, fn.list->text, 1);
8685 * Evaluate a pipeline. All the processes in the pipeline are children
8686 * of the process creating the pipeline. (This differs from some versions
8687 * of the shell, which make the last process in a pipeline the parent
8691 evalpipe(union node *n, int flags)
8694 struct nodelist *lp;
8699 TRACE(("evalpipe(0x%lx) called\n", (long)n));
8701 for (lp = n->npipe.cmdlist; lp; lp = lp->next)
8705 jp = makejob(/*n,*/ pipelen);
8707 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
8711 if (pipe(pip) < 0) {
8713 ash_msg_and_raise_error("pipe call failed");
8716 if (forkshell(jp, lp->n, n->npipe.pipe_backgnd) == 0) {
8729 evaltreenr(lp->n, flags);
8735 /* Don't want to trigger debugging */
8739 if (n->npipe.pipe_backgnd == 0) {
8740 exitstatus = waitforjob(jp);
8741 TRACE(("evalpipe: job done exit status %d\n", exitstatus));
8747 * Controls whether the shell is interactive or not.
8750 setinteractive(int on)
8752 static smallint is_interactive;
8754 if (++on == is_interactive)
8756 is_interactive = on;
8760 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
8761 if (is_interactive > 1) {
8762 /* Looks like they want an interactive shell */
8763 static smallint did_banner;
8766 /* note: ash and hush share this string */
8767 out1fmt("\n\n%s %s\n"
8768 "Enter 'help' for a list of built-in commands."
8771 "built-in shell (ash)"
8785 setinteractive(iflag);
8787 #if ENABLE_FEATURE_EDITING_VI
8789 line_input_state->flags |= VI_MODE;
8791 line_input_state->flags &= ~VI_MODE;
8793 viflag = 0; /* forcibly keep the option off */
8797 static struct localvar *localvars;
8800 * Called after a function returns.
8801 * Interrupts must be off.
8806 struct localvar *lvp;
8809 while ((lvp = localvars) != NULL) {
8810 localvars = lvp->next;
8812 TRACE(("poplocalvar %s\n", vp ? vp->var_text : "-"));
8813 if (vp == NULL) { /* $- saved */
8814 memcpy(optlist, lvp->text, sizeof(optlist));
8815 free((char*)lvp->text);
8817 } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) {
8818 unsetvar(vp->var_text);
8821 vp->var_func(var_end(lvp->text));
8822 if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
8823 free((char*)vp->var_text);
8824 vp->flags = lvp->flags;
8825 vp->var_text = lvp->text;
8832 evalfun(struct funcnode *func, int argc, char **argv, int flags)
8834 volatile struct shparam saveparam;
8835 struct localvar *volatile savelocalvars;
8836 struct jmploc *volatile savehandler;
8837 struct jmploc jmploc;
8840 saveparam = shellparam;
8841 savelocalvars = localvars;
8842 e = setjmp(jmploc.loc);
8847 savehandler = exception_handler;
8848 exception_handler = &jmploc;
8850 shellparam.malloced = 0;
8854 shellparam.nparam = argc - 1;
8855 shellparam.p = argv + 1;
8856 #if ENABLE_ASH_GETOPTS
8857 shellparam.optind = 1;
8858 shellparam.optoff = -1;
8860 evaltree(&func->n, flags & EV_TESTED);
8866 localvars = savelocalvars;
8867 freeparam(&shellparam);
8868 shellparam = saveparam;
8869 exception_handler = savehandler;
8871 evalskip &= ~SKIPFUNC;
8875 #if ENABLE_ASH_CMDCMD
8877 parse_command_args(char **argv, const char **path)
8890 if (c == '-' && !*cp) {
8897 *path = bb_default_path;
8900 /* run 'typecmd' for other options */
8911 * Make a variable a local variable. When a variable is made local, it's
8912 * value and flags are saved in a localvar structure. The saved values
8913 * will be restored when the shell function returns. We handle the name
8914 * "-" as a special case.
8919 struct localvar *lvp;
8924 lvp = ckzalloc(sizeof(struct localvar));
8925 if (LONE_DASH(name)) {
8927 p = ckmalloc(sizeof(optlist));
8928 lvp->text = memcpy(p, optlist, sizeof(optlist));
8933 vpp = hashvar(name);
8934 vp = *findvar(vpp, name);
8935 eq = strchr(name, '=');
8938 setvareq(name, VSTRFIXED);
8940 setvar(name, NULL, VSTRFIXED);
8941 vp = *vpp; /* the new variable */
8942 lvp->flags = VUNSET;
8944 lvp->text = vp->var_text;
8945 lvp->flags = vp->flags;
8946 vp->flags |= VSTRFIXED|VTEXTFIXED;
8952 lvp->next = localvars;
8958 * The "local" command.
8960 static int FAST_FUNC
8961 localcmd(int argc UNUSED_PARAM, char **argv)
8966 while ((name = *argv++) != NULL) {
8972 static int FAST_FUNC
8973 falsecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
8978 static int FAST_FUNC
8979 truecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
8984 static int FAST_FUNC
8985 execcmd(int argc UNUSED_PARAM, char **argv)
8988 iflag = 0; /* exit on error */
8991 shellexec(argv + 1, pathval(), 0);
8997 * The return command.
8999 static int FAST_FUNC
9000 returncmd(int argc UNUSED_PARAM, char **argv)
9003 * If called outside a function, do what ksh does;
9004 * skip the rest of the file.
9006 evalskip = funcnest ? SKIPFUNC : SKIPFILE;
9007 return argv[1] ? number(argv[1]) : exitstatus;
9010 /* Forward declarations for builtintab[] */
9011 static int breakcmd(int, char **) FAST_FUNC;
9012 static int dotcmd(int, char **) FAST_FUNC;
9013 static int evalcmd(int, char **) FAST_FUNC;
9014 static int exitcmd(int, char **) FAST_FUNC;
9015 static int exportcmd(int, char **) FAST_FUNC;
9016 #if ENABLE_ASH_GETOPTS
9017 static int getoptscmd(int, char **) FAST_FUNC;
9019 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
9020 static int helpcmd(int, char **) FAST_FUNC;
9022 #if ENABLE_SH_MATH_SUPPORT
9023 static int letcmd(int, char **) FAST_FUNC;
9025 static int readcmd(int, char **) FAST_FUNC;
9026 static int setcmd(int, char **) FAST_FUNC;
9027 static int shiftcmd(int, char **) FAST_FUNC;
9028 static int timescmd(int, char **) FAST_FUNC;
9029 static int trapcmd(int, char **) FAST_FUNC;
9030 static int umaskcmd(int, char **) FAST_FUNC;
9031 static int unsetcmd(int, char **) FAST_FUNC;
9032 static int ulimitcmd(int, char **) FAST_FUNC;
9034 #define BUILTIN_NOSPEC "0"
9035 #define BUILTIN_SPECIAL "1"
9036 #define BUILTIN_REGULAR "2"
9037 #define BUILTIN_SPEC_REG "3"
9038 #define BUILTIN_ASSIGN "4"
9039 #define BUILTIN_SPEC_ASSG "5"
9040 #define BUILTIN_REG_ASSG "6"
9041 #define BUILTIN_SPEC_REG_ASSG "7"
9043 /* Stubs for calling non-FAST_FUNC's */
9044 #if ENABLE_ASH_BUILTIN_ECHO
9045 static int FAST_FUNC echocmd(int argc, char **argv) { return echo_main(argc, argv); }
9047 #if ENABLE_ASH_BUILTIN_PRINTF
9048 static int FAST_FUNC printfcmd(int argc, char **argv) { return printf_main(argc, argv); }
9050 #if ENABLE_ASH_BUILTIN_TEST
9051 static int FAST_FUNC testcmd(int argc, char **argv) { return test_main(argc, argv); }
9054 /* Keep these in proper order since it is searched via bsearch() */
9055 static const struct builtincmd builtintab[] = {
9056 { BUILTIN_SPEC_REG "." , dotcmd },
9057 { BUILTIN_SPEC_REG ":" , truecmd },
9058 #if ENABLE_ASH_BUILTIN_TEST
9059 { BUILTIN_REGULAR "[" , testcmd },
9060 #if ENABLE_ASH_BASH_COMPAT
9061 { BUILTIN_REGULAR "[[" , testcmd },
9064 #if ENABLE_ASH_ALIAS
9065 { BUILTIN_REG_ASSG "alias" , aliascmd },
9068 { BUILTIN_REGULAR "bg" , fg_bgcmd },
9070 { BUILTIN_SPEC_REG "break" , breakcmd },
9071 { BUILTIN_REGULAR "cd" , cdcmd },
9072 { BUILTIN_NOSPEC "chdir" , cdcmd },
9073 #if ENABLE_ASH_CMDCMD
9074 { BUILTIN_REGULAR "command" , commandcmd },
9076 { BUILTIN_SPEC_REG "continue", breakcmd },
9077 #if ENABLE_ASH_BUILTIN_ECHO
9078 { BUILTIN_REGULAR "echo" , echocmd },
9080 { BUILTIN_SPEC_REG "eval" , evalcmd },
9081 { BUILTIN_SPEC_REG "exec" , execcmd },
9082 { BUILTIN_SPEC_REG "exit" , exitcmd },
9083 { BUILTIN_SPEC_REG_ASSG "export" , exportcmd },
9084 { BUILTIN_REGULAR "false" , falsecmd },
9086 { BUILTIN_REGULAR "fg" , fg_bgcmd },
9088 #if ENABLE_ASH_GETOPTS
9089 { BUILTIN_REGULAR "getopts" , getoptscmd },
9091 { BUILTIN_NOSPEC "hash" , hashcmd },
9092 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
9093 { BUILTIN_NOSPEC "help" , helpcmd },
9096 { BUILTIN_REGULAR "jobs" , jobscmd },
9097 { BUILTIN_REGULAR "kill" , killcmd },
9099 #if ENABLE_SH_MATH_SUPPORT
9100 { BUILTIN_NOSPEC "let" , letcmd },
9102 { BUILTIN_ASSIGN "local" , localcmd },
9103 #if ENABLE_ASH_BUILTIN_PRINTF
9104 { BUILTIN_REGULAR "printf" , printfcmd },
9106 { BUILTIN_NOSPEC "pwd" , pwdcmd },
9107 { BUILTIN_REGULAR "read" , readcmd },
9108 { BUILTIN_SPEC_REG_ASSG "readonly", exportcmd },
9109 { BUILTIN_SPEC_REG "return" , returncmd },
9110 { BUILTIN_SPEC_REG "set" , setcmd },
9111 { BUILTIN_SPEC_REG "shift" , shiftcmd },
9112 #if ENABLE_ASH_BASH_COMPAT
9113 { BUILTIN_SPEC_REG "source" , dotcmd },
9115 #if ENABLE_ASH_BUILTIN_TEST
9116 { BUILTIN_REGULAR "test" , testcmd },
9118 { BUILTIN_SPEC_REG "times" , timescmd },
9119 { BUILTIN_SPEC_REG "trap" , trapcmd },
9120 { BUILTIN_REGULAR "true" , truecmd },
9121 { BUILTIN_NOSPEC "type" , typecmd },
9122 { BUILTIN_NOSPEC "ulimit" , ulimitcmd },
9123 { BUILTIN_REGULAR "umask" , umaskcmd },
9124 #if ENABLE_ASH_ALIAS
9125 { BUILTIN_REGULAR "unalias" , unaliascmd },
9127 { BUILTIN_SPEC_REG "unset" , unsetcmd },
9128 { BUILTIN_REGULAR "wait" , waitcmd },
9131 /* Should match the above table! */
9132 #define COMMANDCMD (builtintab + \
9134 1 * ENABLE_ASH_BUILTIN_TEST + \
9135 1 * ENABLE_ASH_BUILTIN_TEST * ENABLE_ASH_BASH_COMPAT + \
9136 1 * ENABLE_ASH_ALIAS + \
9137 1 * ENABLE_ASH_JOB_CONTROL + \
9139 #define EXECCMD (builtintab + \
9141 1 * ENABLE_ASH_BUILTIN_TEST + \
9142 1 * ENABLE_ASH_BUILTIN_TEST * ENABLE_ASH_BASH_COMPAT + \
9143 1 * ENABLE_ASH_ALIAS + \
9144 1 * ENABLE_ASH_JOB_CONTROL + \
9146 1 * ENABLE_ASH_CMDCMD + \
9148 ENABLE_ASH_BUILTIN_ECHO + \
9152 * Search the table of builtin commands.
9154 static struct builtincmd *
9155 find_builtin(const char *name)
9157 struct builtincmd *bp;
9160 name, builtintab, ARRAY_SIZE(builtintab), sizeof(builtintab[0]),
9167 * Execute a simple command.
9170 isassignment(const char *p)
9172 const char *q = endofname(p);
9177 static int FAST_FUNC
9178 bltincmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
9180 /* Preserve exitstatus of a previous possible redirection
9181 * as POSIX mandates */
9182 return back_exitstatus;
9185 evalcommand(union node *cmd, int flags)
9187 static const struct builtincmd null_bltin = {
9188 "\0\0", bltincmd /* why three NULs? */
9190 struct stackmark smark;
9192 struct arglist arglist;
9193 struct arglist varlist;
9196 const struct strlist *sp;
9197 struct cmdentry cmdentry;
9204 struct builtincmd *bcmd;
9205 smallint cmd_is_exec;
9206 smallint pseudovarflag = 0;
9208 /* First expand the arguments. */
9209 TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags));
9210 setstackmark(&smark);
9211 back_exitstatus = 0;
9213 cmdentry.cmdtype = CMDBUILTIN;
9214 cmdentry.u.cmd = &null_bltin;
9215 varlist.lastp = &varlist.list;
9216 *varlist.lastp = NULL;
9217 arglist.lastp = &arglist.list;
9218 *arglist.lastp = NULL;
9221 if (cmd->ncmd.args) {
9222 bcmd = find_builtin(cmd->ncmd.args->narg.text);
9223 pseudovarflag = bcmd && IS_BUILTIN_ASSIGN(bcmd);
9226 for (argp = cmd->ncmd.args; argp; argp = argp->narg.next) {
9227 struct strlist **spp;
9229 spp = arglist.lastp;
9230 if (pseudovarflag && isassignment(argp->narg.text))
9231 expandarg(argp, &arglist, EXP_VARTILDE);
9233 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
9235 for (sp = *spp; sp; sp = sp->next)
9239 argv = nargv = stalloc(sizeof(char *) * (argc + 1));
9240 for (sp = arglist.list; sp; sp = sp->next) {
9241 TRACE(("evalcommand arg: %s\n", sp->text));
9242 *nargv++ = sp->text;
9247 if (iflag && funcnest == 0 && argc > 0)
9248 lastarg = nargv[-1];
9251 expredir(cmd->ncmd.redirect);
9252 status = redirectsafe(cmd->ncmd.redirect, REDIR_PUSH | REDIR_SAVEFD2);
9254 path = vpath.var_text;
9255 for (argp = cmd->ncmd.assign; argp; argp = argp->narg.next) {
9256 struct strlist **spp;
9259 spp = varlist.lastp;
9260 expandarg(argp, &varlist, EXP_VARTILDE);
9263 * Modify the command lookup path, if a PATH= assignment
9267 if (varcmp(p, path) == 0)
9271 /* Print the command if xflag is set. */
9274 const char *p = " %s" + 1;
9276 fdprintf(preverrout_fd, p, expandstr(ps4val()));
9278 for (n = 0; n < 2; n++) {
9280 fdprintf(preverrout_fd, p, sp->text);
9286 safe_write(preverrout_fd, "\n", 1);
9292 /* Now locate the command. */
9294 const char *oldpath;
9295 int cmd_flag = DO_ERR;
9300 find_command(argv[0], &cmdentry, cmd_flag, path);
9301 if (cmdentry.cmdtype == CMDUNKNOWN) {
9302 flush_stdout_stderr();
9307 /* implement bltin and command here */
9308 if (cmdentry.cmdtype != CMDBUILTIN)
9311 spclbltin = IS_BUILTIN_SPECIAL(cmdentry.u.cmd);
9312 if (cmdentry.u.cmd == EXECCMD)
9314 #if ENABLE_ASH_CMDCMD
9315 if (cmdentry.u.cmd == COMMANDCMD) {
9317 nargv = parse_command_args(argv, &path);
9320 argc -= nargv - argv;
9322 cmd_flag |= DO_NOFUNC;
9330 /* We have a redirection error. */
9332 raise_exception(EXERROR);
9334 exitstatus = status;
9338 /* Execute the command. */
9339 switch (cmdentry.cmdtype) {
9342 #if ENABLE_FEATURE_SH_NOFORK
9343 /* (1) BUG: if variables are set, we need to fork, or save/restore them
9344 * around run_nofork_applet() call.
9345 * (2) Should this check also be done in forkshell()?
9346 * (perhaps it should, so that "VAR=VAL nofork" at least avoids exec...)
9348 /* find_command() encodes applet_no as (-2 - applet_no) */
9349 int applet_no = (- cmdentry.u.index - 2);
9350 if (applet_no >= 0 && APPLET_IS_NOFORK(applet_no)) {
9351 listsetvar(varlist.list, VEXPORT|VSTACK);
9352 /* run <applet>_main() */
9353 exitstatus = run_nofork_applet(applet_no, argv);
9357 /* Can we avoid forking off? For example, very last command
9358 * in a script or a subshell does not need forking,
9359 * we can just exec it.
9361 if (!(flags & EV_EXIT) || may_have_traps) {
9362 /* No, forking off a child is necessary */
9364 jp = makejob(/*cmd,*/ 1);
9365 if (forkshell(jp, cmd, FORK_FG) != 0) {
9367 exitstatus = waitforjob(jp);
9369 TRACE(("forked child exited with %d\n", exitstatus));
9374 /* fall through to exec'ing external program */
9376 listsetvar(varlist.list, VEXPORT|VSTACK);
9377 shellexec(argv, path, cmdentry.u.index);
9381 cmdenviron = varlist.list;
9383 struct strlist *list = cmdenviron;
9385 if (spclbltin > 0 || argc == 0) {
9387 if (cmd_is_exec && argc > 1)
9390 listsetvar(list, i);
9392 /* Tight loop with builtins only:
9393 * "while kill -0 $child; do true; done"
9394 * will never exit even if $child died, unless we do this
9395 * to reap the zombie and make kill detect that it's gone: */
9396 dowait(DOWAIT_NONBLOCK, NULL);
9398 if (evalbltin(cmdentry.u.cmd, argc, argv)) {
9400 int i = exception_type;
9405 exit_status = 128 + SIGINT;
9407 exit_status = 128 + pending_sig;
9408 exitstatus = exit_status;
9409 if (i == EXINT || spclbltin > 0) {
9411 longjmp(exception_handler->loc, 1);
9418 listsetvar(varlist.list, 0);
9419 /* See above for the rationale */
9420 dowait(DOWAIT_NONBLOCK, NULL);
9421 if (evalfun(cmdentry.u.func, argc, argv, flags))
9428 popredir(/*drop:*/ cmd_is_exec, /*restore:*/ cmd_is_exec);
9430 /* dsl: I think this is intended to be used to support
9431 * '_' in 'vi' command mode during line editing...
9432 * However I implemented that within libedit itself.
9434 setvar("_", lastarg, 0);
9436 popstackmark(&smark);
9440 evalbltin(const struct builtincmd *cmd, int argc, char **argv)
9442 char *volatile savecmdname;
9443 struct jmploc *volatile savehandler;
9444 struct jmploc jmploc;
9447 savecmdname = commandname;
9448 i = setjmp(jmploc.loc);
9451 savehandler = exception_handler;
9452 exception_handler = &jmploc;
9453 commandname = argv[0];
9455 optptr = NULL; /* initialize nextopt */
9456 exitstatus = (*cmd->builtin)(argc, argv);
9457 flush_stdout_stderr();
9459 exitstatus |= ferror(stdout);
9461 commandname = savecmdname;
9462 exception_handler = savehandler;
9468 goodname(const char *p)
9470 return endofname(p)[0] == '\0';
9475 * Search for a command. This is called before we fork so that the
9476 * location of the command will be available in the parent as well as
9477 * the child. The check for "goodname" is an overly conservative
9478 * check that the name will not be subject to expansion.
9481 prehash(union node *n)
9483 struct cmdentry entry;
9485 if (n->type == NCMD && n->ncmd.args && goodname(n->ncmd.args->narg.text))
9486 find_command(n->ncmd.args->narg.text, &entry, 0, pathval());
9490 /* ============ Builtin commands
9492 * Builtin commands whose functions are closely tied to evaluation
9493 * are implemented here.
9497 * Handle break and continue commands. Break, continue, and return are
9498 * all handled by setting the evalskip flag. The evaluation routines
9499 * above all check this flag, and if it is set they start skipping
9500 * commands rather than executing them. The variable skipcount is
9501 * the number of loops to break/continue, or the number of function
9502 * levels to return. (The latter is always 1.) It should probably
9503 * be an error to break out of more loops than exist, but it isn't
9504 * in the standard shell so we don't make it one here.
9506 static int FAST_FUNC
9507 breakcmd(int argc UNUSED_PARAM, char **argv)
9509 int n = argv[1] ? number(argv[1]) : 1;
9512 ash_msg_and_raise_error(msg_illnum, argv[1]);
9516 evalskip = (**argv == 'c') ? SKIPCONT : SKIPBREAK;
9523 /* ============ input.c
9525 * This implements the input routines used by the parser.
9529 INPUT_PUSH_FILE = 1,
9530 INPUT_NOFILE_OK = 2,
9533 static smallint checkkwd;
9534 /* values of checkkwd variable */
9535 #define CHKALIAS 0x1
9540 * Push a string back onto the input at this current parsefile level.
9541 * We handle aliases this way.
9543 #if !ENABLE_ASH_ALIAS
9544 #define pushstring(s, ap) pushstring(s)
9547 pushstring(char *s, struct alias *ap)
9554 if (g_parsefile->strpush) {
9555 sp = ckzalloc(sizeof(*sp));
9556 sp->prev = g_parsefile->strpush;
9558 sp = &(g_parsefile->basestrpush);
9560 g_parsefile->strpush = sp;
9561 sp->prev_string = g_parsefile->next_to_pgetc;
9562 sp->prev_left_in_line = g_parsefile->left_in_line;
9563 #if ENABLE_ASH_ALIAS
9566 ap->flag |= ALIASINUSE;
9570 g_parsefile->next_to_pgetc = s;
9571 g_parsefile->left_in_line = len;
9578 struct strpush *sp = g_parsefile->strpush;
9581 #if ENABLE_ASH_ALIAS
9583 if (g_parsefile->next_to_pgetc[-1] == ' '
9584 || g_parsefile->next_to_pgetc[-1] == '\t'
9586 checkkwd |= CHKALIAS;
9588 if (sp->string != sp->ap->val) {
9591 sp->ap->flag &= ~ALIASINUSE;
9592 if (sp->ap->flag & ALIASDEAD) {
9593 unalias(sp->ap->name);
9597 g_parsefile->next_to_pgetc = sp->prev_string;
9598 g_parsefile->left_in_line = sp->prev_left_in_line;
9599 g_parsefile->strpush = sp->prev;
9600 if (sp != &(g_parsefile->basestrpush))
9605 //FIXME: BASH_COMPAT with "...&" does TWO pungetc():
9606 //it peeks whether it is &>, and then pushes back both chars.
9607 //This function needs to save last *next_to_pgetc to buf[0]
9608 //to make two pungetc() reliable. Currently,
9609 // pgetc (out of buf: does preadfd), pgetc, pungetc, pungetc won't work...
9614 char *buf = g_parsefile->buf;
9616 g_parsefile->next_to_pgetc = buf;
9617 #if ENABLE_FEATURE_EDITING
9619 if (!iflag || g_parsefile->pf_fd != STDIN_FILENO)
9620 nr = nonblock_immune_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1, /*loop_on_EINTR:*/ 1);
9623 # if ENABLE_ASH_IDLE_TIMEOUT
9625 const char *tmout_var = lookupvar("TMOUT");
9627 timeout = atoi(tmout_var) * 1000;
9633 # if ENABLE_FEATURE_TAB_COMPLETION
9634 line_input_state->path_lookup = pathval();
9636 /* Unicode support should be activated even if LANG is set
9637 * _during_ shell execution, not only if it was set when
9638 * shell was started. Therefore, re-check LANG every time:
9640 reinit_unicode(lookupvar("LANG"));
9641 nr = read_line_input(line_input_state, cmdedit_prompt, buf, IBUFSIZ, timeout);
9643 /* Ctrl+C pressed */
9654 /* Ctrl+D pressed */
9657 # if ENABLE_ASH_IDLE_TIMEOUT
9658 else if (errno == EAGAIN && timeout > 0) {
9659 printf("\007timed out waiting for input: auto-logout\n");
9666 nr = nonblock_immune_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1, /*loop_on_EINTR:*/ 1);
9669 #if 0 /* disabled: nonblock_immune_read() handles this problem */
9671 if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
9672 int flags = fcntl(0, F_GETFL);
9673 if (flags >= 0 && (flags & O_NONBLOCK)) {
9674 flags &= ~O_NONBLOCK;
9675 if (fcntl(0, F_SETFL, flags) >= 0) {
9676 out2str("sh: turning off NDELAY mode\n");
9687 * Refill the input buffer and return the next input character:
9689 * 1) If a string was pushed back on the input, pop it;
9690 * 2) If an EOF was pushed back (g_parsefile->left_in_line < -BIGNUM)
9691 * or we are reading from a string so we can't refill the buffer,
9693 * 3) If there is more stuff in this buffer, use it else call read to fill it.
9694 * 4) Process input up to the next newline, deleting nul characters.
9696 //#define pgetc_debug(...) bb_error_msg(__VA_ARGS__)
9697 #define pgetc_debug(...) ((void)0)
9704 while (g_parsefile->strpush) {
9705 #if ENABLE_ASH_ALIAS
9706 if (g_parsefile->left_in_line == -1
9707 && g_parsefile->strpush->ap
9708 && g_parsefile->next_to_pgetc[-1] != ' '
9709 && g_parsefile->next_to_pgetc[-1] != '\t'
9711 pgetc_debug("preadbuffer PEOA");
9716 /* try "pgetc" now: */
9717 pgetc_debug("preadbuffer internal pgetc at %d:%p'%s'",
9718 g_parsefile->left_in_line,
9719 g_parsefile->next_to_pgetc,
9720 g_parsefile->next_to_pgetc);
9721 if (--g_parsefile->left_in_line >= 0)
9722 return (unsigned char)(*g_parsefile->next_to_pgetc++);
9724 /* on both branches above g_parsefile->left_in_line < 0.
9725 * "pgetc" needs refilling.
9728 /* -90 is our -BIGNUM. Below we use -99 to mark "EOF on read",
9729 * pungetc() may increment it a few times.
9730 * Assuming it won't increment it to less than -90.
9732 if (g_parsefile->left_in_line < -90 || g_parsefile->buf == NULL) {
9733 pgetc_debug("preadbuffer PEOF1");
9734 /* even in failure keep left_in_line and next_to_pgetc
9735 * in lock step, for correct multi-layer pungetc.
9736 * left_in_line was decremented before preadbuffer(),
9737 * must inc next_to_pgetc: */
9738 g_parsefile->next_to_pgetc++;
9742 more = g_parsefile->left_in_buffer;
9744 flush_stdout_stderr();
9748 /* don't try reading again */
9749 g_parsefile->left_in_line = -99;
9750 pgetc_debug("preadbuffer PEOF2");
9751 g_parsefile->next_to_pgetc++;
9756 /* Find out where's the end of line.
9757 * Set g_parsefile->left_in_line
9758 * and g_parsefile->left_in_buffer acordingly.
9759 * NUL chars are deleted.
9761 q = g_parsefile->next_to_pgetc;
9769 memmove(q, q + 1, more);
9773 g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1;
9779 g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1;
9780 if (g_parsefile->left_in_line < 0)
9785 g_parsefile->left_in_buffer = more;
9790 out2str(g_parsefile->next_to_pgetc);
9794 pgetc_debug("preadbuffer at %d:%p'%s'",
9795 g_parsefile->left_in_line,
9796 g_parsefile->next_to_pgetc,
9797 g_parsefile->next_to_pgetc);
9798 return (unsigned char)*g_parsefile->next_to_pgetc++;
9801 #define pgetc_as_macro() \
9802 (--g_parsefile->left_in_line >= 0 \
9803 ? (unsigned char)*g_parsefile->next_to_pgetc++ \
9810 pgetc_debug("pgetc_fast at %d:%p'%s'",
9811 g_parsefile->left_in_line,
9812 g_parsefile->next_to_pgetc,
9813 g_parsefile->next_to_pgetc);
9814 return pgetc_as_macro();
9817 #if ENABLE_ASH_OPTIMIZE_FOR_SIZE
9818 # define pgetc_fast() pgetc()
9820 # define pgetc_fast() pgetc_as_macro()
9823 #if ENABLE_ASH_ALIAS
9825 pgetc_without_PEOA(void)
9829 pgetc_debug("pgetc_fast at %d:%p'%s'",
9830 g_parsefile->left_in_line,
9831 g_parsefile->next_to_pgetc,
9832 g_parsefile->next_to_pgetc);
9834 } while (c == PEOA);
9838 # define pgetc_without_PEOA() pgetc()
9842 * Read a line from the script.
9845 pfgets(char *line, int len)
9851 while (--nleft > 0) {
9852 c = pgetc_without_PEOA();
9867 * Undo the last call to pgetc. Only one character may be pushed back.
9868 * PEOF may be pushed back.
9873 g_parsefile->left_in_line++;
9874 g_parsefile->next_to_pgetc--;
9875 pgetc_debug("pushed back to %d:%p'%s'",
9876 g_parsefile->left_in_line,
9877 g_parsefile->next_to_pgetc,
9878 g_parsefile->next_to_pgetc);
9882 * To handle the "." command, a stack of input files is used. Pushfile
9883 * adds a new entry to the stack and popfile restores the previous level.
9888 struct parsefile *pf;
9890 pf = ckzalloc(sizeof(*pf));
9891 pf->prev = g_parsefile;
9893 /*pf->strpush = NULL; - ckzalloc did it */
9894 /*pf->basestrpush.prev = NULL;*/
9901 struct parsefile *pf = g_parsefile;
9909 g_parsefile = pf->prev;
9915 * Return to top level.
9920 while (g_parsefile != &basepf)
9925 * Close the file(s) that the shell is reading commands from. Called
9926 * after a fork is done.
9932 if (g_parsefile->pf_fd > 0) {
9933 close(g_parsefile->pf_fd);
9934 g_parsefile->pf_fd = 0;
9939 * Like setinputfile, but takes an open file descriptor. Call this with
9943 setinputfd(int fd, int push)
9945 close_on_exec_on(fd);
9948 g_parsefile->buf = NULL;
9950 g_parsefile->pf_fd = fd;
9951 if (g_parsefile->buf == NULL)
9952 g_parsefile->buf = ckmalloc(IBUFSIZ);
9953 g_parsefile->left_in_buffer = 0;
9954 g_parsefile->left_in_line = 0;
9955 g_parsefile->linno = 1;
9959 * Set the input to take input from a file. If push is set, push the
9960 * old input onto the stack first.
9963 setinputfile(const char *fname, int flags)
9969 fd = open(fname, O_RDONLY);
9971 if (flags & INPUT_NOFILE_OK)
9973 ash_msg_and_raise_error("can't open '%s'", fname);
9976 fd2 = copyfd(fd, 10);
9979 ash_msg_and_raise_error("out of file descriptors");
9982 setinputfd(fd, flags & INPUT_PUSH_FILE);
9989 * Like setinputfile, but takes input from a string.
9992 setinputstring(char *string)
9996 g_parsefile->next_to_pgetc = string;
9997 g_parsefile->left_in_line = strlen(string);
9998 g_parsefile->buf = NULL;
9999 g_parsefile->linno = 1;
10004 /* ============ mail.c
10006 * Routines to check for mail.
10009 #if ENABLE_ASH_MAIL
10011 #define MAXMBOXES 10
10013 /* times of mailboxes */
10014 static time_t mailtime[MAXMBOXES];
10015 /* Set if MAIL or MAILPATH is changed. */
10016 static smallint mail_var_path_changed;
10019 * Print appropriate message(s) if mail has arrived.
10020 * If mail_var_path_changed is set,
10021 * then the value of MAIL has mail_var_path_changed,
10022 * so we just update the values.
10031 struct stackmark smark;
10034 setstackmark(&smark);
10035 mpath = mpathset() ? mpathval() : mailval();
10036 for (mtp = mailtime; mtp < mailtime + MAXMBOXES; mtp++) {
10037 p = path_advance(&mpath, nullstr);
10042 for (q = p; *q; q++)
10048 q[-1] = '\0'; /* delete trailing '/' */
10049 if (stat(p, &statb) < 0) {
10053 if (!mail_var_path_changed && statb.st_mtime != *mtp) {
10056 pathopt ? pathopt : "you have mail"
10059 *mtp = statb.st_mtime;
10061 mail_var_path_changed = 0;
10062 popstackmark(&smark);
10065 static void FAST_FUNC
10066 changemail(const char *val UNUSED_PARAM)
10068 mail_var_path_changed = 1;
10071 #endif /* ASH_MAIL */
10074 /* ============ ??? */
10077 * Set the shell parameters.
10080 setparam(char **argv)
10086 for (nparam = 0; argv[nparam]; nparam++)
10088 ap = newparam = ckmalloc((nparam + 1) * sizeof(*ap));
10090 *ap++ = ckstrdup(*argv++);
10093 freeparam(&shellparam);
10094 shellparam.malloced = 1;
10095 shellparam.nparam = nparam;
10096 shellparam.p = newparam;
10097 #if ENABLE_ASH_GETOPTS
10098 shellparam.optind = 1;
10099 shellparam.optoff = -1;
10104 * Process shell options. The global variable argptr contains a pointer
10105 * to the argument list; we advance it past the options.
10107 * SUSv3 section 2.8.1 "Consequences of Shell Errors" says:
10108 * For a non-interactive shell, an error condition encountered
10109 * by a special built-in ... shall cause the shell to write a diagnostic message
10110 * to standard error and exit as shown in the following table:
10111 * Error Special Built-In
10113 * Utility syntax error (option or operand error) Shall exit
10115 * However, in bug 1142 (http://busybox.net/bugs/view.php?id=1142)
10116 * we see that bash does not do that (set "finishes" with error code 1 instead,
10117 * and shell continues), and people rely on this behavior!
10119 * set -o barfoo 2>/dev/null
10122 * Oh well. Let's mimic that.
10125 plus_minus_o(char *name, int val)
10130 for (i = 0; i < NOPTS; i++) {
10131 if (strcmp(name, optnames(i)) == 0) {
10136 ash_msg("illegal option %co %s", val ? '-' : '+', name);
10139 for (i = 0; i < NOPTS; i++) {
10141 out1fmt("%-16s%s\n", optnames(i), optlist[i] ? "on" : "off");
10143 out1fmt("set %co %s\n", optlist[i] ? '-' : '+', optnames(i));
10149 setoption(int flag, int val)
10153 for (i = 0; i < NOPTS; i++) {
10154 if (optletters(i) == flag) {
10159 ash_msg_and_raise_error("illegal option %c%c", val ? '-' : '+', flag);
10163 options(int cmdline)
10171 while ((p = *argptr) != NULL) {
10173 if (c != '-' && c != '+')
10176 val = 0; /* val = 0 if c == '+' */
10179 if (p[0] == '\0' || LONE_DASH(p)) {
10181 /* "-" means turn off -x and -v */
10184 /* "--" means reset params */
10185 else if (*argptr == NULL)
10188 break; /* "-" or "--" terminates options */
10191 /* first char was + or - */
10192 while ((c = *p++) != '\0') {
10193 /* bash 3.2 indeed handles -c CMD and +c CMD the same */
10194 if (c == 'c' && cmdline) {
10195 minusc = p; /* command is after shell args */
10196 } else if (c == 'o') {
10197 if (plus_minus_o(*argptr, val)) {
10198 /* it already printed err message */
10199 return 1; /* error */
10203 } else if (cmdline && (c == 'l')) { /* -l or +l == --login */
10205 /* bash does not accept +-login, we also won't */
10206 } else if (cmdline && val && (c == '-')) { /* long options */
10207 if (strcmp(p, "login") == 0)
10219 * The shift builtin command.
10221 static int FAST_FUNC
10222 shiftcmd(int argc UNUSED_PARAM, char **argv)
10229 n = number(argv[1]);
10230 if (n > shellparam.nparam)
10231 n = 0; /* bash compat, was = shellparam.nparam; */
10233 shellparam.nparam -= n;
10234 for (ap1 = shellparam.p; --n >= 0; ap1++) {
10235 if (shellparam.malloced)
10238 ap2 = shellparam.p;
10239 while ((*ap2++ = *ap1++) != NULL)
10241 #if ENABLE_ASH_GETOPTS
10242 shellparam.optind = 1;
10243 shellparam.optoff = -1;
10250 * POSIX requires that 'set' (but not export or readonly) output the
10251 * variables in lexicographic order - by the locale's collating order (sigh).
10252 * Maybe we could keep them in an ordered balanced binary tree
10253 * instead of hashed lists.
10254 * For now just roll 'em through qsort for printing...
10257 showvars(const char *sep_prefix, int on, int off)
10260 char **ep, **epend;
10262 ep = listvars(on, off, &epend);
10263 qsort(ep, epend - ep, sizeof(char *), vpcmp);
10265 sep = *sep_prefix ? " " : sep_prefix;
10267 for (; ep < epend; ep++) {
10271 p = strchrnul(*ep, '=');
10274 q = single_quote(++p);
10275 out1fmt("%s%s%.*s%s\n", sep_prefix, sep, (int)(p - *ep), *ep, q);
10281 * The set command builtin.
10283 static int FAST_FUNC
10284 setcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
10289 return showvars(nullstr, 0, VUNSET);
10292 retval = options(/*cmdline:*/ 0);
10293 if (retval == 0) { /* if no parse error... */
10295 if (*argptr != NULL) {
10303 #if ENABLE_ASH_RANDOM_SUPPORT
10304 static void FAST_FUNC
10305 change_random(const char *value)
10309 if (value == NULL) {
10310 /* "get", generate */
10311 t = next_random(&random_gen);
10312 /* set without recursion */
10313 setvar(vrandom.var_text, utoa(t), VNOFUNC);
10314 vrandom.flags &= ~VNOFUNC;
10317 t = strtoul(value, NULL, 10);
10318 INIT_RANDOM_T(&random_gen, (t ? t : 1), t);
10323 #if ENABLE_ASH_GETOPTS
10325 getopts(char *optstr, char *optvar, char **optfirst, int *param_optind, int *optoff)
10334 if (*param_optind < 1)
10336 optnext = optfirst + *param_optind - 1;
10338 if (*param_optind <= 1 || *optoff < 0 || (int)strlen(optnext[-1]) < *optoff)
10341 p = optnext[-1] + *optoff;
10342 if (p == NULL || *p == '\0') {
10343 /* Current word is done, advance */
10345 if (p == NULL || *p != '-' || *++p == '\0') {
10352 if (LONE_DASH(p)) /* check for "--" */
10357 for (q = optstr; *q != c;) {
10359 if (optstr[0] == ':') {
10362 err |= setvarsafe("OPTARG", s, 0);
10364 fprintf(stderr, "Illegal option -%c\n", c);
10365 unsetvar("OPTARG");
10375 if (*p == '\0' && (p = *optnext) == NULL) {
10376 if (optstr[0] == ':') {
10379 err |= setvarsafe("OPTARG", s, 0);
10382 fprintf(stderr, "No arg for -%c option\n", c);
10383 unsetvar("OPTARG");
10391 err |= setvarsafe("OPTARG", p, 0);
10394 err |= setvarsafe("OPTARG", nullstr, 0);
10396 *optoff = p ? p - *(optnext - 1) : -1;
10397 *param_optind = optnext - optfirst + 1;
10398 fmtstr(s, sizeof(s), "%d", *param_optind);
10399 err |= setvarsafe("OPTIND", s, VNOFUNC);
10402 err |= setvarsafe(optvar, s, 0);
10406 flush_stdout_stderr();
10407 raise_exception(EXERROR);
10413 * The getopts builtin. Shellparam.optnext points to the next argument
10414 * to be processed. Shellparam.optptr points to the next character to
10415 * be processed in the current argument. If shellparam.optnext is NULL,
10416 * then it's the first time getopts has been called.
10418 static int FAST_FUNC
10419 getoptscmd(int argc, char **argv)
10424 ash_msg_and_raise_error("usage: getopts optstring var [arg]");
10426 optbase = shellparam.p;
10427 if (shellparam.optind > shellparam.nparam + 1) {
10428 shellparam.optind = 1;
10429 shellparam.optoff = -1;
10432 optbase = &argv[3];
10433 if (shellparam.optind > argc - 2) {
10434 shellparam.optind = 1;
10435 shellparam.optoff = -1;
10439 return getopts(argv[1], argv[2], optbase, &shellparam.optind,
10440 &shellparam.optoff);
10442 #endif /* ASH_GETOPTS */
10445 /* ============ Shell parser */
10448 struct heredoc *next; /* next here document in list */
10449 union node *here; /* redirection node */
10450 char *eofmark; /* string indicating end of input */
10451 smallint striptabs; /* if set, strip leading tabs */
10454 static smallint tokpushback; /* last token pushed back */
10455 static smallint parsebackquote; /* nonzero if we are inside backquotes */
10456 static smallint quoteflag; /* set if (part of) last token was quoted */
10457 static token_id_t lasttoken; /* last token read (integer id Txxx) */
10458 static struct heredoc *heredoclist; /* list of here documents to read */
10459 static char *wordtext; /* text of last word returned by readtoken */
10460 static struct nodelist *backquotelist;
10461 static union node *redirnode;
10462 static struct heredoc *heredoc;
10464 static const char *
10465 tokname(char *buf, int tok)
10468 return tokname_array[tok] + 1;
10469 sprintf(buf, "\"%s\"", tokname_array[tok] + 1);
10473 /* raise_error_unexpected_syntax:
10474 * Called when an unexpected token is read during the parse. The argument
10475 * is the token that is expected, or -1 if more than one type of token can
10476 * occur at this point.
10478 static void raise_error_unexpected_syntax(int) NORETURN;
10480 raise_error_unexpected_syntax(int token)
10486 l = sprintf(msg, "unexpected %s", tokname(buf, lasttoken));
10488 sprintf(msg + l, " (expecting %s)", tokname(buf, token));
10489 raise_error_syntax(msg);
10493 #define EOFMARKLEN 79
10495 /* parsing is heavily cross-recursive, need these forward decls */
10496 static union node *andor(void);
10497 static union node *pipeline(void);
10498 static union node *parse_command(void);
10499 static void parseheredoc(void);
10500 static char peektoken(void);
10501 static int readtoken(void);
10503 static union node *
10506 union node *n1, *n2, *n3;
10509 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10510 if (nlflag == 2 && peektoken())
10516 if (tok == TBACKGND) {
10517 if (n2->type == NPIPE) {
10518 n2->npipe.pipe_backgnd = 1;
10520 if (n2->type != NREDIR) {
10521 n3 = stzalloc(sizeof(struct nredir));
10523 /*n3->nredir.redirect = NULL; - stzalloc did it */
10526 n2->type = NBACKGND;
10532 n3 = stzalloc(sizeof(struct nbinary));
10534 n3->nbinary.ch1 = n1;
10535 n3->nbinary.ch2 = n2;
10551 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10559 pungetc(); /* push back EOF on input */
10563 raise_error_unexpected_syntax(-1);
10570 static union node *
10573 union node *n1, *n2, *n3;
10581 } else if (t == TOR) {
10587 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10589 n3 = stzalloc(sizeof(struct nbinary));
10591 n3->nbinary.ch1 = n1;
10592 n3->nbinary.ch2 = n2;
10597 static union node *
10600 union node *n1, *n2, *pipenode;
10601 struct nodelist *lp, *prev;
10605 TRACE(("pipeline: entered\n"));
10606 if (readtoken() == TNOT) {
10608 checkkwd = CHKKWD | CHKALIAS;
10611 n1 = parse_command();
10612 if (readtoken() == TPIPE) {
10613 pipenode = stzalloc(sizeof(struct npipe));
10614 pipenode->type = NPIPE;
10615 /*pipenode->npipe.pipe_backgnd = 0; - stzalloc did it */
10616 lp = stzalloc(sizeof(struct nodelist));
10617 pipenode->npipe.cmdlist = lp;
10621 lp = stzalloc(sizeof(struct nodelist));
10622 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10623 lp->n = parse_command();
10625 } while (readtoken() == TPIPE);
10631 n2 = stzalloc(sizeof(struct nnot));
10639 static union node *
10644 n = stzalloc(sizeof(struct narg));
10646 /*n->narg.next = NULL; - stzalloc did it */
10647 n->narg.text = wordtext;
10648 n->narg.backquote = backquotelist;
10653 fixredir(union node *n, const char *text, int err)
10657 TRACE(("Fix redir %s %d\n", text, err));
10659 n->ndup.vname = NULL;
10661 fd = bb_strtou(text, NULL, 10);
10662 if (!errno && fd >= 0)
10663 n->ndup.dupfd = fd;
10664 else if (LONE_DASH(text))
10665 n->ndup.dupfd = -1;
10668 raise_error_syntax("bad fd number");
10669 n->ndup.vname = makename();
10674 * Returns true if the text contains nothing to expand (no dollar signs
10678 noexpand(const char *text)
10682 while ((c = *text++) != '\0') {
10683 if (c == CTLQUOTEMARK)
10687 else if (SIT(c, BASESYNTAX) == CCTL)
10696 union node *n = redirnode;
10698 if (readtoken() != TWORD)
10699 raise_error_unexpected_syntax(-1);
10700 if (n->type == NHERE) {
10701 struct heredoc *here = heredoc;
10705 if (quoteflag == 0)
10707 TRACE(("Here document %d\n", n->type));
10708 if (!noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN)
10709 raise_error_syntax("illegal eof marker for << redirection");
10710 rmescapes(wordtext, 0);
10711 here->eofmark = wordtext;
10713 if (heredoclist == NULL)
10714 heredoclist = here;
10716 for (p = heredoclist; p->next; p = p->next)
10720 } else if (n->type == NTOFD || n->type == NFROMFD) {
10721 fixredir(n, wordtext, 0);
10723 n->nfile.fname = makename();
10727 static union node *
10730 union node *args, **app;
10731 union node *n = NULL;
10732 union node *vars, **vpp;
10733 union node **rpp, *redir;
10735 #if ENABLE_ASH_BASH_COMPAT
10736 smallint double_brackets_flag = 0;
10746 savecheckkwd = CHKALIAS;
10749 checkkwd = savecheckkwd;
10752 #if ENABLE_ASH_BASH_COMPAT
10753 case TAND: /* "&&" */
10754 case TOR: /* "||" */
10755 if (!double_brackets_flag) {
10759 wordtext = (char *) (t == TAND ? "-a" : "-o");
10762 n = stzalloc(sizeof(struct narg));
10764 /*n->narg.next = NULL; - stzalloc did it */
10765 n->narg.text = wordtext;
10766 #if ENABLE_ASH_BASH_COMPAT
10767 if (strcmp("[[", wordtext) == 0)
10768 double_brackets_flag = 1;
10769 else if (strcmp("]]", wordtext) == 0)
10770 double_brackets_flag = 0;
10772 n->narg.backquote = backquotelist;
10773 if (savecheckkwd && isassignment(wordtext)) {
10775 vpp = &n->narg.next;
10778 app = &n->narg.next;
10783 *rpp = n = redirnode;
10784 rpp = &n->nfile.next;
10785 parsefname(); /* read name of redirection file */
10788 if (args && app == &args->narg.next
10791 struct builtincmd *bcmd;
10794 /* We have a function */
10795 if (readtoken() != TRP)
10796 raise_error_unexpected_syntax(TRP);
10797 name = n->narg.text;
10798 if (!goodname(name)
10799 || ((bcmd = find_builtin(name)) && IS_BUILTIN_SPECIAL(bcmd))
10801 raise_error_syntax("bad function name");
10804 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10805 n->narg.next = parse_command();
10818 n = stzalloc(sizeof(struct ncmd));
10820 n->ncmd.args = args;
10821 n->ncmd.assign = vars;
10822 n->ncmd.redirect = redir;
10826 static union node *
10827 parse_command(void)
10829 union node *n1, *n2;
10830 union node *ap, **app;
10831 union node *cp, **cpp;
10832 union node *redir, **rpp;
10839 switch (readtoken()) {
10841 raise_error_unexpected_syntax(-1);
10844 n1 = stzalloc(sizeof(struct nif));
10846 n1->nif.test = list(0);
10847 if (readtoken() != TTHEN)
10848 raise_error_unexpected_syntax(TTHEN);
10849 n1->nif.ifpart = list(0);
10851 while (readtoken() == TELIF) {
10852 n2->nif.elsepart = stzalloc(sizeof(struct nif));
10853 n2 = n2->nif.elsepart;
10855 n2->nif.test = list(0);
10856 if (readtoken() != TTHEN)
10857 raise_error_unexpected_syntax(TTHEN);
10858 n2->nif.ifpart = list(0);
10860 if (lasttoken == TELSE)
10861 n2->nif.elsepart = list(0);
10863 n2->nif.elsepart = NULL;
10871 n1 = stzalloc(sizeof(struct nbinary));
10872 n1->type = (lasttoken == TWHILE) ? NWHILE : NUNTIL;
10873 n1->nbinary.ch1 = list(0);
10876 TRACE(("expecting DO got '%s' %s\n", tokname_array[got] + 1,
10877 got == TWORD ? wordtext : ""));
10878 raise_error_unexpected_syntax(TDO);
10880 n1->nbinary.ch2 = list(0);
10885 if (readtoken() != TWORD || quoteflag || !goodname(wordtext))
10886 raise_error_syntax("bad for loop variable");
10887 n1 = stzalloc(sizeof(struct nfor));
10889 n1->nfor.var = wordtext;
10890 checkkwd = CHKKWD | CHKALIAS;
10891 if (readtoken() == TIN) {
10893 while (readtoken() == TWORD) {
10894 n2 = stzalloc(sizeof(struct narg));
10896 /*n2->narg.next = NULL; - stzalloc did it */
10897 n2->narg.text = wordtext;
10898 n2->narg.backquote = backquotelist;
10900 app = &n2->narg.next;
10903 n1->nfor.args = ap;
10904 if (lasttoken != TNL && lasttoken != TSEMI)
10905 raise_error_unexpected_syntax(-1);
10907 n2 = stzalloc(sizeof(struct narg));
10909 /*n2->narg.next = NULL; - stzalloc did it */
10910 n2->narg.text = (char *)dolatstr;
10911 /*n2->narg.backquote = NULL;*/
10912 n1->nfor.args = n2;
10914 * Newline or semicolon here is optional (but note
10915 * that the original Bourne shell only allowed NL).
10917 if (lasttoken != TNL && lasttoken != TSEMI)
10920 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10921 if (readtoken() != TDO)
10922 raise_error_unexpected_syntax(TDO);
10923 n1->nfor.body = list(0);
10927 n1 = stzalloc(sizeof(struct ncase));
10929 if (readtoken() != TWORD)
10930 raise_error_unexpected_syntax(TWORD);
10931 n1->ncase.expr = n2 = stzalloc(sizeof(struct narg));
10933 /*n2->narg.next = NULL; - stzalloc did it */
10934 n2->narg.text = wordtext;
10935 n2->narg.backquote = backquotelist;
10937 checkkwd = CHKKWD | CHKALIAS;
10938 } while (readtoken() == TNL);
10939 if (lasttoken != TIN)
10940 raise_error_unexpected_syntax(TIN);
10941 cpp = &n1->ncase.cases;
10943 checkkwd = CHKNL | CHKKWD;
10945 while (t != TESAC) {
10946 if (lasttoken == TLP)
10948 *cpp = cp = stzalloc(sizeof(struct nclist));
10950 app = &cp->nclist.pattern;
10952 *app = ap = stzalloc(sizeof(struct narg));
10954 /*ap->narg.next = NULL; - stzalloc did it */
10955 ap->narg.text = wordtext;
10956 ap->narg.backquote = backquotelist;
10957 if (readtoken() != TPIPE)
10959 app = &ap->narg.next;
10962 //ap->narg.next = NULL;
10963 if (lasttoken != TRP)
10964 raise_error_unexpected_syntax(TRP);
10965 cp->nclist.body = list(2);
10967 cpp = &cp->nclist.next;
10969 checkkwd = CHKNL | CHKKWD;
10973 raise_error_unexpected_syntax(TENDCASE);
10980 n1 = stzalloc(sizeof(struct nredir));
10981 n1->type = NSUBSHELL;
10982 n1->nredir.n = list(0);
10983 /*n1->nredir.redirect = NULL; - stzalloc did it */
10993 return simplecmd();
10996 if (readtoken() != t)
10997 raise_error_unexpected_syntax(t);
11000 /* Now check for redirection which may follow command */
11001 checkkwd = CHKKWD | CHKALIAS;
11003 while (readtoken() == TREDIR) {
11004 *rpp = n2 = redirnode;
11005 rpp = &n2->nfile.next;
11011 if (n1->type != NSUBSHELL) {
11012 n2 = stzalloc(sizeof(struct nredir));
11017 n1->nredir.redirect = redir;
11022 #if ENABLE_ASH_BASH_COMPAT
11023 static int decode_dollar_squote(void)
11025 static const char C_escapes[] ALIGN1 = "nrbtfav""x\\01234567";
11031 p = strchr(C_escapes, c);
11036 if ((unsigned char)(c - '0') <= 7) { /* \ooo */
11040 } while ((unsigned char)(c - '0') <= 7 && --cnt);
11042 } else if (c == 'x') { /* \xHH */
11046 } while (isxdigit(c) && --cnt);
11048 if (cnt == 3) { /* \x but next char is "bad" */
11052 } else { /* simple seq like \\ or \t */
11057 c = bb_process_escape_sequence((void*)&p);
11058 } else { /* unrecognized "\z": print both chars unless ' or " */
11059 if (c != '\'' && c != '"') {
11061 c |= 0x100; /* "please encode \, then me" */
11069 * If eofmark is NULL, read a word or a redirection symbol. If eofmark
11070 * is not NULL, read a here document. In the latter case, eofmark is the
11071 * word which marks the end of the document and striptabs is true if
11072 * leading tabs should be stripped from the document. The argument c
11073 * is the first character of the input token or document.
11075 * Because C does not have internal subroutines, I have simulated them
11076 * using goto's to implement the subroutine linkage. The following macros
11077 * will run code that appears at the end of readtoken1.
11079 #define CHECKEND() {goto checkend; checkend_return:;}
11080 #define PARSEREDIR() {goto parseredir; parseredir_return:;}
11081 #define PARSESUB() {goto parsesub; parsesub_return:;}
11082 #define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;}
11083 #define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;}
11084 #define PARSEARITH() {goto parsearith; parsearith_return:;}
11086 readtoken1(int c, int syntax, char *eofmark, int striptabs)
11088 /* NB: syntax parameter fits into smallint */
11089 /* c parameter is an unsigned char or PEOF or PEOA */
11092 char line[EOFMARKLEN + 1];
11093 struct nodelist *bqlist;
11097 smallint prevsyntax; /* syntax before arithmetic */
11098 #if ENABLE_ASH_EXPAND_PRMT
11099 smallint pssyntax; /* we are expanding a prompt string */
11101 int varnest; /* levels of variables expansion */
11102 int arinest; /* levels of arithmetic expansion */
11103 int parenlevel; /* levels of parens in arithmetic */
11104 int dqvarnest; /* levels of variables expansion within double quotes */
11106 IF_ASH_BASH_COMPAT(smallint bash_dollar_squote = 0;)
11109 /* Avoid longjmp clobbering */
11115 (void) &parenlevel;
11118 (void) &prevsyntax;
11121 startlinno = g_parsefile->linno;
11125 #if ENABLE_ASH_EXPAND_PRMT
11126 pssyntax = (syntax == PSSYNTAX);
11130 dblquote = (syntax == DQSYNTAX);
11136 STARTSTACKSTR(out);
11138 /* For each line, until end of word */
11139 CHECKEND(); /* set c to PEOF if at end of here document */
11140 for (;;) { /* until end of line or end of word */
11141 CHECKSTRSPACE(4, out); /* permit 4 calls to USTPUTC */
11142 switch (SIT(c, syntax)) {
11143 case CNL: /* '\n' */
11144 if (syntax == BASESYNTAX)
11145 goto endword; /* exit outer loop */
11147 g_parsefile->linno++;
11148 setprompt_if(doprompt, 2);
11150 goto loop; /* continue outer loop */
11155 if (eofmark == NULL || dblquote)
11156 USTPUTC(CTLESC, out);
11157 #if ENABLE_ASH_BASH_COMPAT
11158 if (c == '\\' && bash_dollar_squote) {
11159 c = decode_dollar_squote();
11161 USTPUTC('\\', out);
11162 c = (unsigned char)c;
11168 case CBACK: /* backslash */
11169 c = pgetc_without_PEOA();
11171 USTPUTC(CTLESC, out);
11172 USTPUTC('\\', out);
11174 } else if (c == '\n') {
11175 setprompt_if(doprompt, 2);
11177 #if ENABLE_ASH_EXPAND_PRMT
11178 if (c == '$' && pssyntax) {
11179 USTPUTC(CTLESC, out);
11180 USTPUTC('\\', out);
11183 /* Backslash is retained if we are in "str" and next char isn't special */
11188 && (c != '"' || eofmark != NULL)
11190 USTPUTC(CTLESC, out);
11191 USTPUTC('\\', out);
11193 if (SIT(c, SQSYNTAX) == CCTL)
11194 USTPUTC(CTLESC, out);
11202 if (eofmark == NULL) {
11203 USTPUTC(CTLQUOTEMARK, out);
11211 IF_ASH_BASH_COMPAT(bash_dollar_squote = 0;)
11212 if (eofmark != NULL && arinest == 0
11217 if (dqvarnest == 0) {
11218 syntax = BASESYNTAX;
11225 case CVAR: /* '$' */
11226 PARSESUB(); /* parse substitution */
11228 case CENDVAR: /* '}' */
11231 if (dqvarnest > 0) {
11238 #if ENABLE_SH_MATH_SUPPORT
11239 case CLP: /* '(' in arithmetic */
11243 case CRP: /* ')' in arithmetic */
11244 if (parenlevel > 0) {
11247 if (pgetc() == ')') {
11248 if (--arinest == 0) {
11249 syntax = prevsyntax;
11250 dblquote = (syntax == DQSYNTAX);
11255 * unbalanced parens
11256 * (don't 2nd guess - no error)
11264 case CBQUOTE: /* '`' */
11268 goto endword; /* exit outer loop */
11272 if (varnest == 0) {
11273 #if ENABLE_ASH_BASH_COMPAT
11275 if (pgetc() == '>')
11276 c = 0x100 + '>'; /* flag &> */
11280 goto endword; /* exit outer loop */
11282 IF_ASH_ALIAS(if (c != PEOA))
11289 #if ENABLE_SH_MATH_SUPPORT
11290 if (syntax == ARISYNTAX)
11291 raise_error_syntax("missing '))'");
11293 if (syntax != BASESYNTAX && !parsebackquote && eofmark == NULL)
11294 raise_error_syntax("unterminated quoted string");
11295 if (varnest != 0) {
11296 startlinno = g_parsefile->linno;
11298 raise_error_syntax("missing '}'");
11300 USTPUTC('\0', out);
11301 len = out - (char *)stackblock();
11302 out = stackblock();
11303 if (eofmark == NULL) {
11304 if ((c == '>' || c == '<' IF_ASH_BASH_COMPAT( || c == 0x100 + '>'))
11307 if (isdigit_str9(out)) {
11308 PARSEREDIR(); /* passed as params: out, c */
11309 lasttoken = TREDIR;
11312 /* else: non-number X seen, interpret it
11313 * as "NNNX>file" = "NNNX >file" */
11317 quoteflag = quotef;
11318 backquotelist = bqlist;
11319 grabstackblock(len);
11323 /* end of readtoken routine */
11326 * Check to see whether we are at the end of the here document. When this
11327 * is called, c is set to the first character of the next input line. If
11328 * we are at the end of the here document, this routine sets the c to PEOF.
11332 #if ENABLE_ASH_ALIAS
11334 c = pgetc_without_PEOA();
11337 while (c == '\t') {
11338 c = pgetc_without_PEOA();
11341 if (c == *eofmark) {
11342 if (pfgets(line, sizeof(line)) != NULL) {
11346 for (q = eofmark + 1; *q && *p == *q; p++, q++)
11348 if (*p == '\n' && *q == '\0') {
11350 g_parsefile->linno++;
11351 needprompt = doprompt;
11353 pushstring(line, NULL);
11358 goto checkend_return;
11362 * Parse a redirection operator. The variable "out" points to a string
11363 * specifying the fd to be redirected. The variable "c" contains the
11364 * first character of the redirection operator.
11367 /* out is already checked to be a valid number or "" */
11368 int fd = (*out == '\0' ? -1 : atoi(out));
11371 np = stzalloc(sizeof(struct nfile));
11376 np->type = NAPPEND;
11378 np->type = NCLOBBER;
11381 /* it also can be NTO2 (>&file), but we can't figure it out yet */
11387 #if ENABLE_ASH_BASH_COMPAT
11388 else if (c == 0x100 + '>') { /* this flags &> redirection */
11390 pgetc(); /* this is '>', no need to check */
11394 else { /* c == '<' */
11395 /*np->nfile.fd = 0; - stzalloc did it */
11399 if (sizeof(struct nfile) != sizeof(struct nhere)) {
11400 np = stzalloc(sizeof(struct nhere));
11401 /*np->nfile.fd = 0; - stzalloc did it */
11404 heredoc = stzalloc(sizeof(struct heredoc));
11405 heredoc->here = np;
11408 heredoc->striptabs = 1;
11410 /*heredoc->striptabs = 0; - stzalloc did it */
11416 np->type = NFROMFD;
11420 np->type = NFROMTO;
11432 goto parseredir_return;
11436 * Parse a substitution. At this point, we have read the dollar sign
11437 * and nothing else.
11440 /* is_special(c) evaluates to 1 for c in "!#$*-0123456789?@"; 0 otherwise
11441 * (assuming ascii char codes, as the original implementation did) */
11442 #define is_special(c) \
11443 (((unsigned)(c) - 33 < 32) \
11444 && ((0xc1ff920dU >> ((unsigned)(c) - 33)) & 1))
11446 unsigned char subtype;
11451 if (c > 255 /* PEOA or PEOF */
11452 || (c != '(' && c != '{' && !is_name(c) && !is_special(c))
11454 #if ENABLE_ASH_BASH_COMPAT
11456 bash_dollar_squote = 1;
11461 } else if (c == '(') {
11462 /* $(command) or $((arith)) */
11463 if (pgetc() == '(') {
11464 #if ENABLE_SH_MATH_SUPPORT
11467 raise_error_syntax("you disabled math support for $((arith)) syntax");
11474 /* $VAR, $<specialchar>, ${...}, or PEOA/PEOF */
11475 USTPUTC(CTLVAR, out);
11476 typeloc = out - (char *)stackblock();
11477 USTPUTC(VSNORMAL, out);
11478 subtype = VSNORMAL;
11484 c = '#'; /* ${#} - same as $# */
11486 subtype = VSLENGTH; /* ${#VAR} */
11491 if (c <= 255 /* not PEOA or PEOF */ && is_name(c)) {
11492 /* $[{[#]]NAME[}] */
11496 } while (c <= 255 /* not PEOA or PEOF */ && is_in_name(c));
11497 } else if (isdigit(c)) {
11498 /* $[{[#]]NUM[}] */
11502 } while (isdigit(c));
11503 } else if (is_special(c)) {
11504 /* $[{[#]]<specialchar>[}] */
11509 raise_error_syntax("bad substitution");
11511 if (c != '}' && subtype == VSLENGTH) {
11512 /* ${#VAR didn't end with } */
11518 if (subtype == 0) {
11519 /* ${VAR...} but not $VAR or ${#VAR} */
11520 /* c == first char after VAR */
11524 #if ENABLE_ASH_BASH_COMPAT
11525 if (c == ':' || c == '$' || isdigit(c)) {
11526 //TODO: support more general format ${v:EXPR:EXPR},
11527 // where EXPR follows $(()) rules
11528 subtype = VSSUBSTR;
11530 break; /* "goto do_pungetc" is bigger (!) */
11536 static const char types[] ALIGN1 = "}-+?=";
11537 const char *p = strchr(types, c);
11540 subtype = p - types + VSNORMAL;
11546 subtype = (c == '#' ? VSTRIMLEFT : VSTRIMRIGHT);
11553 #if ENABLE_ASH_BASH_COMPAT
11555 /* ${v/[/]pattern/repl} */
11556 //TODO: encode pattern and repl separately.
11557 // Currently ${v/$var_with_slash/repl} is horribly broken
11558 subtype = VSREPLACE;
11562 subtype++; /* VSREPLACEALL */
11570 if (dblquote || arinest)
11572 ((unsigned char *)stackblock())[typeloc] = subtype | flags;
11573 if (subtype != VSNORMAL) {
11575 if (dblquote || arinest) {
11580 goto parsesub_return;
11584 * Called to parse command substitutions. Newstyle is set if the command
11585 * is enclosed inside $(...); nlpp is a pointer to the head of the linked
11586 * list of commands (passed by reference), and savelen is the number of
11587 * characters on the top of the stack which must be preserved.
11590 struct nodelist **nlpp;
11593 char *volatile str;
11594 struct jmploc jmploc;
11595 struct jmploc *volatile savehandler;
11597 smallint saveprompt = 0;
11600 (void) &saveprompt;
11602 savepbq = parsebackquote;
11603 if (setjmp(jmploc.loc)) {
11605 parsebackquote = 0;
11606 exception_handler = savehandler;
11607 longjmp(exception_handler->loc, 1);
11611 savelen = out - (char *)stackblock();
11613 str = ckmalloc(savelen);
11614 memcpy(str, stackblock(), savelen);
11616 savehandler = exception_handler;
11617 exception_handler = &jmploc;
11620 /* We must read until the closing backquote, giving special
11621 treatment to some slashes, and then push the string and
11622 reread it as input, interpreting it normally. */
11627 STARTSTACKSTR(pout);
11631 setprompt_if(needprompt, 2);
11640 g_parsefile->linno++;
11641 setprompt_if(doprompt, 2);
11643 * If eating a newline, avoid putting
11644 * the newline into the new character
11645 * stream (via the STPUTC after the
11650 if (pc != '\\' && pc != '`' && pc != '$'
11651 && (!dblquote || pc != '"')
11653 STPUTC('\\', pout);
11655 if (pc <= 255 /* not PEOA or PEOF */) {
11661 IF_ASH_ALIAS(case PEOA:)
11662 startlinno = g_parsefile->linno;
11663 raise_error_syntax("EOF in backquote substitution");
11666 g_parsefile->linno++;
11667 needprompt = doprompt;
11676 STPUTC('\0', pout);
11677 psavelen = pout - (char *)stackblock();
11678 if (psavelen > 0) {
11679 pstr = grabstackstr(pout);
11680 setinputstring(pstr);
11685 nlpp = &(*nlpp)->next;
11686 *nlpp = stzalloc(sizeof(**nlpp));
11687 /* (*nlpp)->next = NULL; - stzalloc did it */
11688 parsebackquote = oldstyle;
11691 saveprompt = doprompt;
11698 doprompt = saveprompt;
11699 else if (readtoken() != TRP)
11700 raise_error_unexpected_syntax(TRP);
11705 * Start reading from old file again, ignoring any pushed back
11706 * tokens left from the backquote parsing
11711 while (stackblocksize() <= savelen)
11713 STARTSTACKSTR(out);
11715 memcpy(out, str, savelen);
11716 STADJUST(savelen, out);
11722 parsebackquote = savepbq;
11723 exception_handler = savehandler;
11724 if (arinest || dblquote)
11725 USTPUTC(CTLBACKQ | CTLQUOTE, out);
11727 USTPUTC(CTLBACKQ, out);
11729 goto parsebackq_oldreturn;
11730 goto parsebackq_newreturn;
11733 #if ENABLE_SH_MATH_SUPPORT
11735 * Parse an arithmetic expansion (indicate start of one and set state)
11738 if (++arinest == 1) {
11739 prevsyntax = syntax;
11740 syntax = ARISYNTAX;
11741 USTPUTC(CTLARI, out);
11748 * we collapse embedded arithmetic expansion to
11749 * parenthesis, which should be equivalent
11753 goto parsearith_return;
11757 } /* end of readtoken */
11760 * Read the next input token.
11761 * If the token is a word, we set backquotelist to the list of cmds in
11762 * backquotes. We set quoteflag to true if any part of the word was
11764 * If the token is TREDIR, then we set redirnode to a structure containing
11766 * In all cases, the variable startlinno is set to the number of the line
11767 * on which the token starts.
11769 * [Change comment: here documents and internal procedures]
11770 * [Readtoken shouldn't have any arguments. Perhaps we should make the
11771 * word parsing code into a separate routine. In this case, readtoken
11772 * doesn't need to have any internal procedures, but parseword does.
11773 * We could also make parseoperator in essence the main routine, and
11774 * have parseword (readtoken1?) handle both words and redirection.]
11776 #define NEW_xxreadtoken
11777 #ifdef NEW_xxreadtoken
11778 /* singles must be first! */
11779 static const char xxreadtoken_chars[7] ALIGN1 = {
11780 '\n', '(', ')', /* singles */
11781 '&', '|', ';', /* doubles */
11785 #define xxreadtoken_singles 3
11786 #define xxreadtoken_doubles 3
11788 static const char xxreadtoken_tokens[] ALIGN1 = {
11789 TNL, TLP, TRP, /* only single occurrence allowed */
11790 TBACKGND, TPIPE, TSEMI, /* if single occurrence */
11791 TEOF, /* corresponds to trailing nul */
11792 TAND, TOR, TENDCASE /* if double occurrence */
11804 setprompt_if(needprompt, 2);
11805 startlinno = g_parsefile->linno;
11806 for (;;) { /* until token or start of word found */
11808 if (c == ' ' || c == '\t' IF_ASH_ALIAS( || c == PEOA))
11812 while ((c = pgetc()) != '\n' && c != PEOF)
11815 } else if (c == '\\') {
11816 if (pgetc() != '\n') {
11818 break; /* return readtoken1(...) */
11820 startlinno = ++g_parsefile->linno;
11821 setprompt_if(doprompt, 2);
11825 p = xxreadtoken_chars + sizeof(xxreadtoken_chars) - 1;
11828 g_parsefile->linno++;
11829 needprompt = doprompt;
11832 p = strchr(xxreadtoken_chars, c);
11834 break; /* return readtoken1(...) */
11836 if ((int)(p - xxreadtoken_chars) >= xxreadtoken_singles) {
11838 if (cc == c) { /* double occurrence? */
11839 p += xxreadtoken_doubles + 1;
11842 #if ENABLE_ASH_BASH_COMPAT
11843 if (c == '&' && cc == '>') /* &> */
11844 break; /* return readtoken1(...) */
11849 lasttoken = xxreadtoken_tokens[p - xxreadtoken_chars];
11854 return readtoken1(c, BASESYNTAX, (char *) NULL, 0);
11856 #else /* old xxreadtoken */
11857 #define RETURN(token) return lasttoken = token
11867 setprompt_if(needprompt, 2);
11868 startlinno = g_parsefile->linno;
11869 for (;;) { /* until token or start of word found */
11872 case ' ': case '\t':
11873 IF_ASH_ALIAS(case PEOA:)
11876 while ((c = pgetc()) != '\n' && c != PEOF)
11881 if (pgetc() == '\n') {
11882 startlinno = ++g_parsefile->linno;
11883 setprompt_if(doprompt, 2);
11889 g_parsefile->linno++;
11890 needprompt = doprompt;
11895 if (pgetc() == '&')
11900 if (pgetc() == '|')
11905 if (pgetc() == ';')
11918 return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
11921 #endif /* old xxreadtoken */
11928 smallint alreadyseen = tokpushback;
11931 #if ENABLE_ASH_ALIAS
11940 if (checkkwd & CHKNL) {
11947 if (t != TWORD || quoteflag) {
11952 * check for keywords
11954 if (checkkwd & CHKKWD) {
11955 const char *const *pp;
11957 pp = findkwd(wordtext);
11959 lasttoken = t = pp - tokname_array;
11960 TRACE(("keyword '%s' recognized\n", tokname_array[t] + 1));
11965 if (checkkwd & CHKALIAS) {
11966 #if ENABLE_ASH_ALIAS
11968 ap = lookupalias(wordtext, 1);
11971 pushstring(ap->val, ap);
11981 TRACE(("token '%s' %s\n", tokname_array[t] + 1, t == TWORD ? wordtext : ""));
11983 TRACE(("reread token '%s' %s\n", tokname_array[t] + 1, t == TWORD ? wordtext : ""));
11995 return tokname_array[t][0];
11999 * Read and parse a command. Returns NODE_EOF on end of file.
12000 * (NULL is a valid parse tree indicating a blank line.)
12002 static union node *
12003 parsecmd(int interact)
12008 doprompt = interact;
12009 setprompt_if(doprompt, doprompt);
12021 * Input any here documents.
12026 struct heredoc *here;
12029 here = heredoclist;
12030 heredoclist = NULL;
12033 setprompt_if(needprompt, 2);
12034 readtoken1(pgetc(), here->here->type == NHERE ? SQSYNTAX : DQSYNTAX,
12035 here->eofmark, here->striptabs);
12036 n = stzalloc(sizeof(struct narg));
12037 n->narg.type = NARG;
12038 /*n->narg.next = NULL; - stzalloc did it */
12039 n->narg.text = wordtext;
12040 n->narg.backquote = backquotelist;
12041 here->here->nhere.doc = n;
12048 * called by editline -- any expansions to the prompt should be added here.
12050 #if ENABLE_ASH_EXPAND_PRMT
12051 static const char *
12052 expandstr(const char *ps)
12056 /* XXX Fix (char *) cast. It _is_ a bug. ps is variable's value,
12057 * and token processing _can_ alter it (delete NULs etc). */
12058 setinputstring((char *)ps);
12059 readtoken1(pgetc(), PSSYNTAX, nullstr, 0);
12062 n.narg.type = NARG;
12063 n.narg.next = NULL;
12064 n.narg.text = wordtext;
12065 n.narg.backquote = backquotelist;
12067 expandarg(&n, NULL, 0);
12068 return stackblock();
12073 * Execute a command or commands contained in a string.
12076 evalstring(char *s, int mask)
12079 struct stackmark smark;
12083 setstackmark(&smark);
12086 while ((n = parsecmd(0)) != NODE_EOF) {
12088 popstackmark(&smark);
12101 * The eval command.
12103 static int FAST_FUNC
12104 evalcmd(int argc UNUSED_PARAM, char **argv)
12113 STARTSTACKSTR(concat);
12115 concat = stack_putstr(p, concat);
12119 STPUTC(' ', concat);
12121 STPUTC('\0', concat);
12122 p = grabstackstr(concat);
12124 evalstring(p, ~SKIPEVAL);
12130 * Read and execute commands.
12131 * "Top" is nonzero for the top level command loop;
12132 * it turns on prompting if the shell is interactive.
12138 struct stackmark smark;
12142 TRACE(("cmdloop(%d) called\n", top));
12146 setstackmark(&smark);
12149 showjobs(stderr, SHOW_CHANGED);
12152 if (iflag && top) {
12156 n = parsecmd(inter);
12158 if (DEBUG > 2 && debug && (n != NODE_EOF))
12161 if (n == NODE_EOF) {
12162 if (!top || numeof >= 50)
12164 if (!stoppedjobs()) {
12167 out2str("\nUse \"exit\" to leave shell.\n");
12170 } else if (nflag == 0) {
12171 /* job_warning can only be 2,1,0. Here 2->1, 1/0->0 */
12176 popstackmark(&smark);
12181 return skip & SKIPEVAL;
12188 * Take commands from a file. To be compatible we should do a path
12189 * search for the file, which is necessary to find sub-commands.
12192 find_dot_file(char *name)
12195 const char *path = pathval();
12198 /* don't try this for absolute or relative paths */
12199 if (strchr(name, '/'))
12202 /* IIRC standards do not say whether . is to be searched.
12203 * And it is even smaller this way, making it unconditional for now:
12205 if (1) { /* ENABLE_ASH_BASH_COMPAT */
12210 while ((fullname = path_advance(&path, name)) != NULL) {
12212 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
12214 * Don't bother freeing here, since it will
12215 * be freed by the caller.
12219 if (fullname != name)
12220 stunalloc(fullname);
12223 /* not found in the PATH */
12224 ash_msg_and_raise_error("%s: not found", name);
12228 static int FAST_FUNC
12229 dotcmd(int argc, char **argv)
12232 struct strlist *sp;
12233 volatile struct shparam saveparam;
12235 for (sp = cmdenviron; sp; sp = sp->next)
12236 setvareq(ckstrdup(sp->text), VSTRFIXED | VTEXTFIXED);
12239 /* bash says: "bash: .: filename argument required" */
12240 return 2; /* bash compat */
12243 /* "false; . empty_file; echo $?" should print 0, not 1: */
12246 fullname = find_dot_file(argv[1]);
12250 if (argc) { /* argc > 0, argv[0] != NULL */
12251 saveparam = shellparam;
12252 shellparam.malloced = 0;
12253 shellparam.nparam = argc;
12254 shellparam.p = argv;
12257 setinputfile(fullname, INPUT_PUSH_FILE);
12258 commandname = fullname;
12263 freeparam(&shellparam);
12264 shellparam = saveparam;
12270 static int FAST_FUNC
12271 exitcmd(int argc UNUSED_PARAM, char **argv)
12276 exitstatus = number(argv[1]);
12277 raise_exception(EXEXIT);
12282 * Read a file containing shell functions.
12285 readcmdfile(char *name)
12287 setinputfile(name, INPUT_PUSH_FILE);
12293 /* ============ find_command inplementation */
12296 * Resolve a command name. If you change this routine, you may have to
12297 * change the shellexec routine as well.
12300 find_command(char *name, struct cmdentry *entry, int act, const char *path)
12302 struct tblentry *cmdp;
12309 struct builtincmd *bcmd;
12311 /* If name contains a slash, don't use PATH or hash table */
12312 if (strchr(name, '/') != NULL) {
12313 entry->u.index = -1;
12314 if (act & DO_ABS) {
12315 while (stat(name, &statb) < 0) {
12317 if (errno == EINTR)
12320 entry->cmdtype = CMDUNKNOWN;
12324 entry->cmdtype = CMDNORMAL;
12328 /* #if ENABLE_FEATURE_SH_STANDALONE... moved after builtin check */
12330 updatetbl = (path == pathval());
12333 if (strstr(path, "%builtin") != NULL)
12334 act |= DO_ALTBLTIN;
12337 /* If name is in the table, check answer will be ok */
12338 cmdp = cmdlookup(name, 0);
12339 if (cmdp != NULL) {
12342 switch (cmdp->cmdtype) {
12360 } else if (cmdp->rehash == 0)
12361 /* if not invalidated by cd, we're done */
12365 /* If %builtin not in path, check for builtin next */
12366 bcmd = find_builtin(name);
12368 if (IS_BUILTIN_REGULAR(bcmd))
12369 goto builtin_success;
12370 if (act & DO_ALTPATH) {
12371 if (!(act & DO_ALTBLTIN))
12372 goto builtin_success;
12373 } else if (builtinloc <= 0) {
12374 goto builtin_success;
12378 #if ENABLE_FEATURE_SH_STANDALONE
12380 int applet_no = find_applet_by_name(name);
12381 if (applet_no >= 0) {
12382 entry->cmdtype = CMDNORMAL;
12383 entry->u.index = -2 - applet_no;
12389 /* We have to search path. */
12390 prev = -1; /* where to start */
12391 if (cmdp && cmdp->rehash) { /* doing a rehash */
12392 if (cmdp->cmdtype == CMDBUILTIN)
12395 prev = cmdp->param.index;
12401 while ((fullname = path_advance(&path, name)) != NULL) {
12402 stunalloc(fullname);
12403 /* NB: code below will still use fullname
12404 * despite it being "unallocated" */
12407 if (prefix(pathopt, "builtin")) {
12409 goto builtin_success;
12412 if ((act & DO_NOFUNC)
12413 || !prefix(pathopt, "func")
12414 ) { /* ignore unimplemented options */
12418 /* if rehash, don't redo absolute path names */
12419 if (fullname[0] == '/' && idx <= prev) {
12422 TRACE(("searchexec \"%s\": no change\n", name));
12425 while (stat(fullname, &statb) < 0) {
12427 if (errno == EINTR)
12430 if (errno != ENOENT && errno != ENOTDIR)
12434 e = EACCES; /* if we fail, this will be the error */
12435 if (!S_ISREG(statb.st_mode))
12437 if (pathopt) { /* this is a %func directory */
12438 stalloc(strlen(fullname) + 1);
12439 /* NB: stalloc will return space pointed by fullname
12440 * (because we don't have any intervening allocations
12441 * between stunalloc above and this stalloc) */
12442 readcmdfile(fullname);
12443 cmdp = cmdlookup(name, 0);
12444 if (cmdp == NULL || cmdp->cmdtype != CMDFUNCTION)
12445 ash_msg_and_raise_error("%s not defined in %s", name, fullname);
12446 stunalloc(fullname);
12449 TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
12451 entry->cmdtype = CMDNORMAL;
12452 entry->u.index = idx;
12456 cmdp = cmdlookup(name, 1);
12457 cmdp->cmdtype = CMDNORMAL;
12458 cmdp->param.index = idx;
12463 /* We failed. If there was an entry for this command, delete it */
12464 if (cmdp && updatetbl)
12465 delete_cmd_entry();
12467 ash_msg("%s: %s", name, errmsg(e, "not found"));
12468 entry->cmdtype = CMDUNKNOWN;
12473 entry->cmdtype = CMDBUILTIN;
12474 entry->u.cmd = bcmd;
12478 cmdp = cmdlookup(name, 1);
12479 cmdp->cmdtype = CMDBUILTIN;
12480 cmdp->param.cmd = bcmd;
12484 entry->cmdtype = cmdp->cmdtype;
12485 entry->u = cmdp->param;
12489 /* ============ trap.c */
12492 * The trap builtin.
12494 static int FAST_FUNC
12495 trapcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12499 int signo, exitcode;
12504 for (signo = 0; signo < NSIG; signo++) {
12505 char *tr = trap_ptr[signo];
12507 /* note: bash adds "SIG", but only if invoked
12508 * as "bash". If called as "sh", or if set -o posix,
12509 * then it prints short signal names.
12510 * We are printing short names: */
12511 out1fmt("trap -- %s %s\n",
12513 get_signame(signo));
12514 /* trap_ptr != trap only if we are in special-cased `trap` code.
12515 * In this case, we will exit very soon, no need to free(). */
12516 /* if (trap_ptr != trap && tp[0]) */
12521 if (trap_ptr != trap) {
12534 signo = get_signum(*ap);
12536 /* Mimic bash message exactly */
12537 ash_msg("%s: invalid signal specification", *ap);
12543 if (LONE_DASH(action))
12546 action = ckstrdup(action);
12550 may_have_traps = 1;
12551 trap[signo] = action;
12562 /* ============ Builtins */
12564 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
12566 * Lists available builtins
12568 static int FAST_FUNC
12569 helpcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12575 "Built-in commands:\n"
12576 "------------------\n");
12577 for (col = 0, i = 0; i < ARRAY_SIZE(builtintab); i++) {
12578 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '),
12579 builtintab[i].name + 1);
12585 #if ENABLE_FEATURE_SH_STANDALONE
12587 const char *a = applet_names;
12589 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '), a);
12594 a += strlen(a) + 1;
12599 return EXIT_SUCCESS;
12601 #endif /* FEATURE_SH_EXTRA_QUIET */
12604 * The export and readonly commands.
12606 static int FAST_FUNC
12607 exportcmd(int argc UNUSED_PARAM, char **argv)
12613 int flag = argv[0][0] == 'r' ? VREADONLY : VEXPORT;
12615 if (nextopt("p") != 'p') {
12620 p = strchr(name, '=');
12624 vp = *findvar(hashvar(name), name);
12630 setvar(name, p, flag);
12631 } while ((name = *++aptr) != NULL);
12635 showvars(argv[0], flag, 0);
12640 * Delete a function if it exists.
12643 unsetfunc(const char *name)
12645 struct tblentry *cmdp;
12647 cmdp = cmdlookup(name, 0);
12648 if (cmdp != NULL && cmdp->cmdtype == CMDFUNCTION)
12649 delete_cmd_entry();
12653 * The unset builtin command. We unset the function before we unset the
12654 * variable to allow a function to be unset when there is a readonly variable
12655 * with the same name.
12657 static int FAST_FUNC
12658 unsetcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12665 while ((i = nextopt("vf")) != 0) {
12669 for (ap = argptr; *ap; ap++) {
12682 static const unsigned char timescmd_str[] ALIGN1 = {
12683 ' ', offsetof(struct tms, tms_utime),
12684 '\n', offsetof(struct tms, tms_stime),
12685 ' ', offsetof(struct tms, tms_cutime),
12686 '\n', offsetof(struct tms, tms_cstime),
12689 static int FAST_FUNC
12690 timescmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12692 unsigned long clk_tck, s, t;
12693 const unsigned char *p;
12696 clk_tck = sysconf(_SC_CLK_TCK);
12701 t = *(clock_t *)(((char *) &buf) + p[1]);
12704 out1fmt("%lum%lu.%03lus%c",
12706 (t * 1000) / clk_tck,
12714 #if ENABLE_SH_MATH_SUPPORT
12716 * The let builtin. Partially stolen from GNU Bash, the Bourne Again SHell.
12717 * Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
12719 * Copyright (C) 2003 Vladimir Oleynik <dzo@simtreas.ru>
12721 static int FAST_FUNC
12722 letcmd(int argc UNUSED_PARAM, char **argv)
12728 ash_msg_and_raise_error("expression expected");
12730 i = ash_arith(*argv);
12738 * The read builtin. Options:
12739 * -r Do not interpret '\' specially
12740 * -s Turn off echo (tty only)
12741 * -n NCHARS Read NCHARS max
12742 * -p PROMPT Display PROMPT on stderr (if input is from tty)
12743 * -t SECONDS Timeout after SECONDS (tty or pipe only)
12744 * -u FD Read from given FD instead of fd 0
12745 * This uses unbuffered input, which may be avoidable in some cases.
12746 * TODO: bash also has:
12747 * -a ARRAY Read into array[0],[1],etc
12748 * -d DELIM End on DELIM char, not newline
12749 * -e Use line editing (tty only)
12751 static int FAST_FUNC
12752 readcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12754 char *opt_n = NULL;
12755 char *opt_p = NULL;
12756 char *opt_t = NULL;
12757 char *opt_u = NULL;
12758 int read_flags = 0;
12762 while ((i = nextopt("p:u:rt:n:s")) != '\0') {
12771 read_flags |= BUILTIN_READ_SILENT;
12777 read_flags |= BUILTIN_READ_RAW;
12787 r = shell_builtin_read(setvar2,
12789 bltinlookup("IFS"), /* can be NULL */
12797 if ((uintptr_t)r > 1)
12798 ash_msg_and_raise_error(r);
12800 return (uintptr_t)r;
12803 static int FAST_FUNC
12804 umaskcmd(int argc UNUSED_PARAM, char **argv)
12806 static const char permuser[3] ALIGN1 = "ugo";
12807 static const char permmode[3] ALIGN1 = "rwx";
12808 static const short permmask[] ALIGN2 = {
12809 S_IRUSR, S_IWUSR, S_IXUSR,
12810 S_IRGRP, S_IWGRP, S_IXGRP,
12811 S_IROTH, S_IWOTH, S_IXOTH
12814 /* TODO: use bb_parse_mode() instead */
12819 int symbolic_mode = 0;
12821 while (nextopt("S") != '\0') {
12832 if (symbolic_mode) {
12836 for (i = 0; i < 3; i++) {
12839 *p++ = permuser[i];
12841 for (j = 0; j < 3; j++) {
12842 if ((mask & permmask[3 * i + j]) == 0) {
12843 *p++ = permmode[j];
12851 out1fmt("%.4o\n", mask);
12854 if (isdigit((unsigned char) *ap)) {
12857 if (*ap >= '8' || *ap < '0')
12858 ash_msg_and_raise_error(msg_illnum, argv[1]);
12859 mask = (mask << 3) + (*ap - '0');
12860 } while (*++ap != '\0');
12863 mask = ~mask & 0777;
12864 if (!bb_parse_mode(ap, &mask)) {
12865 ash_msg_and_raise_error("illegal mode: %s", ap);
12867 umask(~mask & 0777);
12873 static int FAST_FUNC
12874 ulimitcmd(int argc UNUSED_PARAM, char **argv)
12876 return shell_builtin_ulimit(argv);
12879 /* ============ main() and helpers */
12882 * Called to exit the shell.
12891 status = exitstatus;
12892 TRACE(("pid %d, exitshell(%d)\n", getpid(), status));
12893 if (setjmp(loc.loc)) {
12894 if (exception_type == EXEXIT)
12895 /* dash bug: it just does _exit(exitstatus) here
12896 * but we have to do setjobctl(0) first!
12897 * (bug is still not fixed in dash-0.5.3 - if you run dash
12898 * under Midnight Commander, on exit from dash MC is backgrounded) */
12899 status = exitstatus;
12902 exception_handler = &loc;
12909 flush_stdout_stderr();
12919 /* from input.c: */
12920 /* we will never free this */
12921 basepf.next_to_pgetc = basepf.buf = ckmalloc(IBUFSIZ);
12924 signal(SIGCHLD, SIG_DFL);
12925 /* bash re-enables SIGHUP which is SIG_IGNed on entry.
12926 * Try: "trap '' HUP; bash; echo RET" and type "kill -HUP $$"
12928 signal(SIGHUP, SIG_DFL);
12934 struct stat st1, st2;
12937 for (envp = environ; envp && *envp; envp++) {
12938 if (strchr(*envp, '=')) {
12939 setvareq(*envp, VEXPORT|VTEXTFIXED);
12943 setvar("PPID", utoa(getppid()), 0);
12945 p = lookupvar("PWD");
12947 if (*p != '/' || stat(p, &st1) || stat(".", &st2)
12948 || st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino
12958 //usage:#define ash_trivial_usage
12959 //usage: "[-/+OPTIONS] [-/+o OPT]... [-c 'SCRIPT' [ARG0 [ARGS]] / FILE [ARGS]]"
12960 //usage:#define ash_full_usage "\n\n"
12961 //usage: "Unix shell interpreter"
12963 //usage:#if ENABLE_FEATURE_SH_IS_ASH
12964 //usage:# define sh_trivial_usage ash_trivial_usage
12965 //usage:# define sh_full_usage ash_full_usage
12967 //usage:#if ENABLE_FEATURE_BASH_IS_ASH
12968 //usage:# define bash_trivial_usage ash_trivial_usage
12969 //usage:# define bash_full_usage ash_full_usage
12973 * Process the shell command line arguments.
12976 procargs(char **argv)
12979 const char *xminusc;
12984 /* if (xargv[0]) - mmm, this is always true! */
12986 for (i = 0; i < NOPTS; i++)
12989 if (options(/*cmdline:*/ 1)) {
12990 /* it already printed err message */
12991 raise_exception(EXERROR);
12995 if (*xargv == NULL) {
12997 ash_msg_and_raise_error(bb_msg_requires_arg, "-c");
13000 if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
13004 for (i = 0; i < NOPTS; i++)
13005 if (optlist[i] == 2)
13010 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
13015 } else if (!sflag) {
13016 setinputfile(*xargv, 0);
13019 commandname = arg0;
13022 shellparam.p = xargv;
13023 #if ENABLE_ASH_GETOPTS
13024 shellparam.optind = 1;
13025 shellparam.optoff = -1;
13027 /* assert(shellparam.malloced == 0 && shellparam.nparam == 0); */
13029 shellparam.nparam++;
13036 * Read /etc/profile or .profile.
13039 read_profile(const char *name)
13043 if (setinputfile(name, INPUT_PUSH_FILE | INPUT_NOFILE_OK) < 0)
13052 * This routine is called when an error or an interrupt occurs in an
13053 * interactive shell and control is returned to the main command loop.
13061 /* from input.c: */
13062 g_parsefile->left_in_buffer = 0;
13063 g_parsefile->left_in_line = 0; /* clear input buffer */
13065 /* from parser.c: */
13068 /* from redir.c: */
13069 clearredir(/*drop:*/ 0);
13073 static short profile_buf[16384];
13074 extern int etext();
13078 * Main routine. We initialize things, parse the arguments, execute
13079 * profiles if we're a login shell, and then call cmdloop to execute
13080 * commands. The setjmp call sets up the location to jump to when an
13081 * exception occurs. When an exception occurs the variable "state"
13082 * is used to figure out how far we had gotten.
13084 int ash_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
13085 int ash_main(int argc UNUSED_PARAM, char **argv)
13087 const char *shinit;
13088 volatile smallint state;
13089 struct jmploc jmploc;
13090 struct stackmark smark;
13092 /* Initialize global data */
13096 #if ENABLE_ASH_ALIAS
13102 monitor(4, etext, profile_buf, sizeof(profile_buf), 50);
13105 #if ENABLE_FEATURE_EDITING
13106 line_input_state = new_line_input_t(FOR_SHELL | WITH_PATH_LOOKUP);
13109 if (setjmp(jmploc.loc)) {
13115 e = exception_type;
13119 if (e == EXEXIT || s == 0 || iflag == 0 || shlvl) {
13123 outcslow('\n', stderr);
13126 popstackmark(&smark);
13127 FORCE_INT_ON; /* enable interrupts */
13136 exception_handler = &jmploc;
13139 TRACE(("Shell args: "));
13140 trace_puts_args(argv);
13142 rootpid = getpid();
13145 setstackmark(&smark);
13148 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
13150 const char *hp = lookupvar("HISTFILE");
13152 hp = lookupvar("HOME");
13154 char *defhp = concat_path_file(hp, ".ash_history");
13155 setvar("HISTFILE", defhp, 0);
13161 if (argv[0] && argv[0][0] == '-')
13165 read_profile("/etc/profile");
13168 read_profile(".profile");
13174 getuid() == geteuid() && getgid() == getegid() &&
13178 shinit = lookupvar("ENV");
13179 if (shinit != NULL && *shinit != '\0') {
13180 read_profile(shinit);
13186 /* evalstring pushes parsefile stack.
13187 * Ensure we don't falsely claim that 0 (stdin)
13188 * is one of stacked source fds.
13189 * Testcase: ash -c 'exec 1>&0' must not complain. */
13190 // if (!sflag) g_parsefile->pf_fd = -1;
13191 // ^^ not necessary since now we special-case fd 0
13192 // in is_hidden_fd() to not be considered "hidden fd"
13193 evalstring(minusc, 0);
13196 if (sflag || minusc == NULL) {
13197 #if defined MAX_HISTORY && MAX_HISTORY > 0 && ENABLE_FEATURE_EDITING_SAVEHISTORY
13199 const char *hp = lookupvar("HISTFILE");
13201 line_input_state->hist_file = hp;
13202 # if ENABLE_FEATURE_SH_HISTFILESIZE
13203 hp = lookupvar("HISTFILESIZE");
13204 line_input_state->max_history = size_from_HISTFILESIZE(hp);
13208 state4: /* XXX ??? - why isn't this before the "if" statement */
13216 extern void _mcleanup(void);
13220 TRACE(("End of main reached\n"));
13227 * Copyright (c) 1989, 1991, 1993, 1994
13228 * The Regents of the University of California. All rights reserved.
13230 * This code is derived from software contributed to Berkeley by
13231 * Kenneth Almquist.
13233 * Redistribution and use in source and binary forms, with or without
13234 * modification, are permitted provided that the following conditions
13236 * 1. Redistributions of source code must retain the above copyright
13237 * notice, this list of conditions and the following disclaimer.
13238 * 2. Redistributions in binary form must reproduce the above copyright
13239 * notice, this list of conditions and the following disclaimer in the
13240 * documentation and/or other materials provided with the distribution.
13241 * 3. Neither the name of the University nor the names of its contributors
13242 * may be used to endorse or promote products derived from this software
13243 * without specific prior written permission.
13245 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
13246 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
13247 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
13248 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
13249 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
13250 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
13251 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
13252 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
13253 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
13254 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF