1 /* vi: set sw=4 ts=4: */
3 * ash shell port for busybox
5 * Copyright (c) 1989, 1991, 1993, 1994
6 * The Regents of the University of California. All rights reserved.
8 * Copyright (c) 1997-2005 Herbert Xu <herbert@gondor.apana.org.au>
9 * was re-ported from NetBSD and debianized.
12 * This code is derived from software contributed to Berkeley by
15 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
17 * Original BSD copyright notice is retained at the end of this file.
21 * rewrite arith.y to micro stack based cryptic algorithm by
22 * Copyright (c) 2001 Aaron Lehmann <aaronl@vitelus.com>
24 * Modified by Paul Mundt <lethal@linux-sh.org> (c) 2004 to support
27 * Modified by Vladimir Oleynik <dzo@simtreas.ru> (c) 2001-2005 to be
28 * used in busybox and size optimizations,
29 * rewrote arith (see notes to this), added locale support,
30 * rewrote dynamic variables.
35 * The follow should be set to reflect the type of system you have:
36 * JOBS -> 1 if you have Berkeley job control, 0 otherwise.
37 * define SYSV if you are running under System V.
38 * define DEBUG=1 to compile in debugging ('set -o debug' to turn on)
39 * define DEBUG=2 to compile in and turn on debugging.
41 * When debugging is on, debugging info will be written to ./trace and
42 * a quit signal will generate a core dump.
49 #define JOBS ENABLE_ASH_JOB_CONTROL
57 #include "busybox.h" /* for applet_names */
61 #if JOBS || ENABLE_ASH_READ_NCHARS
66 #define PIPE_BUF 4096 /* amount of buffering in a pipe */
69 #if defined(__uClinux__)
70 #error "Do not even bother, ash will not run on uClinux"
74 /* ============ Hash table sizes. Configurable. */
78 #define CMDTABLESIZE 31 /* should be prime */
81 /* ============ Misc helpers */
83 #define xbarrier() do { __asm__ __volatile__ ("": : :"memory"); } while (0)
85 /* C99 say: "char" declaration may be signed or unsigned default */
86 #define signed_char2int(sc) ((int)((signed char)sc))
89 /* ============ Shell options */
91 static const char *const optletters_optnames[] = {
112 #define optletters(n) optletters_optnames[(n)][0]
113 #define optnames(n) (&optletters_optnames[(n)][1])
115 enum { NOPTS = ARRAY_SIZE(optletters_optnames) };
118 /* ============ Misc data */
120 static const char homestr[] ALIGN1 = "HOME";
121 static const char snlfmt[] ALIGN1 = "%s\n";
122 static const char illnum[] ALIGN1 = "Illegal number: %s";
125 * We enclose jmp_buf in a structure so that we can declare pointers to
126 * jump locations. The global variable handler contains the location to
127 * jump to when an exception occurs, and the global variable exception
128 * contains a code identifying the exception. To implement nested
129 * exception handlers, the user should save the value of handler on entry
130 * to an inner scope, set handler to point to a jmploc structure for the
131 * inner scope, and restore handler on exit from the scope.
137 struct globals_misc {
138 /* pid of main shell */
140 /* shell level: 0 for the main shell, 1 for its children, and so on */
142 #define rootshell (!shlvl)
143 char *minusc; /* argument to -c option */
145 char *curdir; // = nullstr; /* current working directory */
146 char *physdir; // = nullstr; /* physical working directory */
148 char *arg0; /* value of $0 */
150 struct jmploc *exception_handler;
152 // disabled by vda: cannot understand how it was supposed to work -
153 // cannot fix bugs. That's why you have to explain your non-trivial designs!
154 // /* do we generate EXSIG events */
155 // int exsig; /* counter */
156 volatile int suppressint; /* counter */
157 volatile /*sig_atomic_t*/ smallint intpending; /* 1 = got SIGINT */
158 /* last pending signal */
159 volatile /*sig_atomic_t*/ smallint pendingsig;
160 smallint exception; /* kind of exception (0..5) */
162 #define EXINT 0 /* SIGINT received */
163 #define EXERROR 1 /* a generic error */
164 #define EXSHELLPROC 2 /* execute a shell procedure */
165 #define EXEXEC 3 /* command execution failed */
166 #define EXEXIT 4 /* exit the shell */
167 #define EXSIG 5 /* trapped signal in wait(1) */
170 char nullstr[1]; /* zero length string */
173 #define eflag optlist[0]
174 #define fflag optlist[1]
175 #define Iflag optlist[2]
176 #define iflag optlist[3]
177 #define mflag optlist[4]
178 #define nflag optlist[5]
179 #define sflag optlist[6]
180 #define xflag optlist[7]
181 #define vflag optlist[8]
182 #define Cflag optlist[9]
183 #define aflag optlist[10]
184 #define bflag optlist[11]
185 #define uflag optlist[12]
186 #define viflag optlist[13]
188 #define nolog optlist[14]
189 #define debug optlist[15]
192 /* trap handler commands */
194 * Sigmode records the current value of the signal handlers for the various
195 * modes. A value of zero means that the current handler is not known.
196 * S_HARD_IGN indicates that the signal was ignored on entry to the shell,
198 char sigmode[NSIG - 1];
199 #define S_DFL 1 /* default signal handling (SIG_DFL) */
200 #define S_CATCH 2 /* signal is caught */
201 #define S_IGN 3 /* signal is ignored (SIG_IGN) */
202 #define S_HARD_IGN 4 /* signal is ignored permenantly */
203 #define S_RESET 5 /* temporary - to reset a hard ignored sig */
205 /* indicates specified signal received */
206 char gotsig[NSIG - 1];
209 /* Rarely referenced stuff */
210 #if ENABLE_ASH_RANDOM_SUPPORT
211 /* Random number generators */
212 int32_t random_galois_LFSR; /* Galois LFSR (fast but weak). signed! */
213 uint32_t random_LCG; /* LCG (fast but weak) */
215 pid_t backgndpid; /* pid of last background process */
216 smallint job_warning; /* user was warned about stopped jobs (can be 2, 1 or 0). */
218 extern struct globals_misc *const ash_ptr_to_globals_misc;
219 #define G_misc (*ash_ptr_to_globals_misc)
220 #define rootpid (G_misc.rootpid )
221 #define shlvl (G_misc.shlvl )
222 #define minusc (G_misc.minusc )
223 #define curdir (G_misc.curdir )
224 #define physdir (G_misc.physdir )
225 #define arg0 (G_misc.arg0 )
226 #define exception_handler (G_misc.exception_handler)
227 #define exception (G_misc.exception )
228 #define suppressint (G_misc.suppressint )
229 #define intpending (G_misc.intpending )
230 //#define exsig (G_misc.exsig )
231 #define pendingsig (G_misc.pendingsig )
232 #define isloginsh (G_misc.isloginsh )
233 #define nullstr (G_misc.nullstr )
234 #define optlist (G_misc.optlist )
235 #define sigmode (G_misc.sigmode )
236 #define gotsig (G_misc.gotsig )
237 #define trap (G_misc.trap )
238 #define random_galois_LFSR (G_misc.random_galois_LFSR)
239 #define random_LCG (G_misc.random_LCG )
240 #define backgndpid (G_misc.backgndpid )
241 #define job_warning (G_misc.job_warning)
242 #define INIT_G_misc() do { \
243 (*(struct globals_misc**)&ash_ptr_to_globals_misc) = xzalloc(sizeof(G_misc)); \
250 /* ============ Interrupts / exceptions */
253 * These macros allow the user to suspend the handling of interrupt signals
254 * over a period of time. This is similar to SIGHOLD or to sigblock, but
255 * much more efficient and portable. (But hacking the kernel is so much
256 * more fun than worrying about efficiency and portability. :-))
258 #define INT_OFF do { \
264 * Called to raise an exception. Since C doesn't include exceptions, we
265 * just do a longjmp to the exception handler. The type of exception is
266 * stored in the global variable "exception".
268 static void raise_exception(int) NORETURN;
270 raise_exception(int e)
273 if (exception_handler == NULL)
278 longjmp(exception_handler->loc, 1);
282 * Called from trap.c when a SIGINT is received. (If the user specifies
283 * that SIGINT is to be trapped or ignored using the trap builtin, then
284 * this routine is not called.) Suppressint is nonzero when interrupts
285 * are held using the INT_OFF macro. (The test for iflag is just
286 * defensive programming.)
288 static void raise_interrupt(void) NORETURN;
290 raise_interrupt(void)
295 /* Signal is not automatically unmasked after it is raised,
296 * do it ourself - unmask all signals */
297 sigprocmask_allsigs(SIG_UNBLOCK);
298 /* pendingsig = 0; - now done in onsig() */
301 if (gotsig[SIGINT - 1] && !trap[SIGINT]) {
302 if (!(rootshell && iflag)) {
303 /* Kill ourself with SIGINT */
304 signal(SIGINT, SIG_DFL);
313 #if ENABLE_ASH_OPTIMIZE_FOR_SIZE
317 if (--suppressint == 0 && intpending) {
321 #define INT_ON int_on()
329 #define FORCE_INT_ON force_int_on()
331 #define INT_ON do { \
333 if (--suppressint == 0 && intpending) \
336 #define FORCE_INT_ON do { \
342 #endif /* ASH_OPTIMIZE_FOR_SIZE */
344 #define SAVE_INT(v) ((v) = suppressint)
346 #define RESTORE_INT(v) do { \
349 if (suppressint == 0 && intpending) \
354 * Ignore a signal. Only one usage site - in forkchild()
359 if (sigmode[signo - 1] != S_IGN && sigmode[signo - 1] != S_HARD_IGN) {
360 signal(signo, SIG_IGN);
362 sigmode[signo - 1] = S_HARD_IGN;
366 * Signal handler. Only one usage site - in setsignal()
371 gotsig[signo - 1] = 1;
374 if (/* exsig || */ (signo == SIGINT && !trap[SIGINT])) {
377 raise_interrupt(); /* does not return */
384 /* ============ Stdout/stderr output */
387 outstr(const char *p, FILE *file)
395 flush_stdout_stderr(void)
412 outcslow(int c, FILE *dest)
420 static int out1fmt(const char *, ...) __attribute__((__format__(__printf__,1,2)));
422 out1fmt(const char *fmt, ...)
429 r = vprintf(fmt, ap);
435 static int fmtstr(char *, size_t, const char *, ...) __attribute__((__format__(__printf__,3,4)));
437 fmtstr(char *outbuf, size_t length, const char *fmt, ...)
444 ret = vsnprintf(outbuf, length, fmt, ap);
451 out1str(const char *p)
457 out2str(const char *p)
464 /* ============ Parser structures */
466 /* control characters in argument strings */
467 #define CTLESC '\201' /* escape next character */
468 #define CTLVAR '\202' /* variable defn */
469 #define CTLENDVAR '\203'
470 #define CTLBACKQ '\204'
471 #define CTLQUOTE 01 /* ored with CTLBACKQ code if in quotes */
472 /* CTLBACKQ | CTLQUOTE == '\205' */
473 #define CTLARI '\206' /* arithmetic expression */
474 #define CTLENDARI '\207'
475 #define CTLQUOTEMARK '\210'
477 /* variable substitution byte (follows CTLVAR) */
478 #define VSTYPE 0x0f /* type of variable substitution */
479 #define VSNUL 0x10 /* colon--treat the empty string as unset */
480 #define VSQUOTE 0x80 /* inside double quotes--suppress splitting */
482 /* values of VSTYPE field */
483 #define VSNORMAL 0x1 /* normal variable: $var or ${var} */
484 #define VSMINUS 0x2 /* ${var-text} */
485 #define VSPLUS 0x3 /* ${var+text} */
486 #define VSQUESTION 0x4 /* ${var?message} */
487 #define VSASSIGN 0x5 /* ${var=text} */
488 #define VSTRIMRIGHT 0x6 /* ${var%pattern} */
489 #define VSTRIMRIGHTMAX 0x7 /* ${var%%pattern} */
490 #define VSTRIMLEFT 0x8 /* ${var#pattern} */
491 #define VSTRIMLEFTMAX 0x9 /* ${var##pattern} */
492 #define VSLENGTH 0xa /* ${#var} */
493 #if ENABLE_ASH_BASH_COMPAT
494 #define VSSUBSTR 0xc /* ${var:position:length} */
495 #define VSREPLACE 0xd /* ${var/pattern/replacement} */
496 #define VSREPLACEALL 0xe /* ${var//pattern/replacement} */
499 static const char dolatstr[] ALIGN1 = {
500 CTLVAR, VSNORMAL|VSQUOTE, '@', '=', '\0'
533 smallint type; /* Nxxxx */
536 union node *redirect;
541 smallint pipe_backgnd;
542 struct nodelist *cmdlist;
548 union node *redirect;
561 union node *elsepart;
588 struct nodelist *backquote;
601 union node *next; /* must match nfile's layout */
602 int fd; /* must match nfile's layout */
623 struct nredir nredir;
624 struct nbinary nbinary;
628 struct nclist nclist;
637 struct nodelist *next;
650 freefunc(struct funcnode *f)
652 if (f && --f->count < 0)
657 /* ============ Debugging output */
661 static FILE *tracefile;
664 trace_printf(const char *fmt, ...)
671 vfprintf(tracefile, fmt, va);
676 trace_vprintf(const char *fmt, va_list va)
680 vfprintf(tracefile, fmt, va);
684 trace_puts(const char *s)
692 trace_puts_quoted(char *s)
699 putc('"', tracefile);
700 for (p = s; *p; p++) {
702 case '\n': c = 'n'; goto backslash;
703 case '\t': c = 't'; goto backslash;
704 case '\r': c = 'r'; goto backslash;
705 case '"': c = '"'; goto backslash;
706 case '\\': c = '\\'; goto backslash;
707 case CTLESC: c = 'e'; goto backslash;
708 case CTLVAR: c = 'v'; goto backslash;
709 case CTLVAR+CTLQUOTE: c = 'V'; goto backslash;
710 case CTLBACKQ: c = 'q'; goto backslash;
711 case CTLBACKQ+CTLQUOTE: c = 'Q'; goto backslash;
713 putc('\\', tracefile);
717 if (*p >= ' ' && *p <= '~')
720 putc('\\', tracefile);
721 putc(*p >> 6 & 03, tracefile);
722 putc(*p >> 3 & 07, tracefile);
723 putc(*p & 07, tracefile);
728 putc('"', tracefile);
732 trace_puts_args(char **ap)
739 trace_puts_quoted(*ap);
741 putc('\n', tracefile);
744 putc(' ', tracefile);
759 /* leave open because libedit might be using it */
762 strcpy(s, "./trace");
764 if (!freopen(s, "a", tracefile)) {
765 fprintf(stderr, "Can't re-open %s\n", s);
770 tracefile = fopen(s, "a");
771 if (tracefile == NULL) {
772 fprintf(stderr, "Can't open %s\n", s);
778 flags = fcntl(fileno(tracefile), F_GETFL);
780 fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND);
782 setlinebuf(tracefile);
783 fputs("\nTracing started.\n", tracefile);
787 indent(int amount, char *pfx, FILE *fp)
791 for (i = 0; i < amount; i++) {
792 if (pfx && i == amount - 1)
798 /* little circular references here... */
799 static void shtree(union node *n, int ind, char *pfx, FILE *fp);
802 sharg(union node *arg, FILE *fp)
805 struct nodelist *bqlist;
808 if (arg->type != NARG) {
809 out1fmt("<node type %d>\n", arg->type);
812 bqlist = arg->narg.backquote;
813 for (p = arg->narg.text; *p; p++) {
822 if (subtype == VSLENGTH)
831 switch (subtype & VSTYPE) {
864 out1fmt("<subtype %d>", subtype);
871 case CTLBACKQ|CTLQUOTE:
874 shtree(bqlist->n, -1, NULL, fp);
885 shcmd(union node *cmd, FILE *fp)
893 for (np = cmd->ncmd.args; np; np = np->narg.next) {
899 for (np = cmd->ncmd.redirect; np; np = np->nfile.next) {
903 switch (np->nfile.type) {
904 case NTO: s = ">>"+1; dftfd = 1; break;
905 case NCLOBBER: s = ">|"; dftfd = 1; break;
906 case NAPPEND: s = ">>"; dftfd = 1; break;
907 case NTOFD: s = ">&"; dftfd = 1; break;
908 case NFROM: s = "<"; break;
909 case NFROMFD: s = "<&"; break;
910 case NFROMTO: s = "<>"; break;
911 default: s = "*error*"; break;
913 if (np->nfile.fd != dftfd)
914 fprintf(fp, "%d", np->nfile.fd);
916 if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) {
917 fprintf(fp, "%d", np->ndup.dupfd);
919 sharg(np->nfile.fname, fp);
926 shtree(union node *n, int ind, char *pfx, FILE *fp)
934 indent(ind, pfx, fp);
945 shtree(n->nbinary.ch1, ind, NULL, fp);
948 shtree(n->nbinary.ch2, ind, NULL, fp);
956 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
961 if (n->npipe.pipe_backgnd)
967 fprintf(fp, "<node type %d>", n->type);
975 showtree(union node *n)
977 trace_puts("showtree called\n");
978 shtree(n, 1, NULL, stdout);
981 #define TRACE(param) trace_printf param
982 #define TRACEV(param) trace_vprintf param
987 #define TRACEV(param)
992 /* ============ Parser data */
995 * ash_vmsg() needs parsefile->fd, hence parsefile definition is moved up.
998 struct strlist *next;
1005 struct strpush *prev; /* preceding string on stack */
1008 #if ENABLE_ASH_ALIAS
1009 struct alias *ap; /* if push was associated with an alias */
1011 char *string; /* remember the string since it may change */
1015 struct parsefile *prev; /* preceding file on stack */
1016 int linno; /* current line */
1017 int fd; /* file descriptor (or -1 if string) */
1018 int nleft; /* number of chars left in this line */
1019 int lleft; /* number of chars left in this buffer */
1020 char *nextc; /* next char in buffer */
1021 char *buf; /* input buffer */
1022 struct strpush *strpush; /* for pushing strings at this level */
1023 struct strpush basestrpush; /* so pushing one is fast */
1026 static struct parsefile basepf; /* top level input file */
1027 static struct parsefile *g_parsefile = &basepf; /* current input file */
1028 static int startlinno; /* line # where last token started */
1029 static char *commandname; /* currently executing command */
1030 static struct strlist *cmdenviron; /* environment for builtin command */
1031 static uint8_t exitstatus; /* exit status of last command */
1034 /* ============ Message printing */
1037 ash_vmsg(const char *msg, va_list ap)
1039 fprintf(stderr, "%s: ", arg0);
1041 if (strcmp(arg0, commandname))
1042 fprintf(stderr, "%s: ", commandname);
1043 if (!iflag || g_parsefile->fd)
1044 fprintf(stderr, "line %d: ", startlinno);
1046 vfprintf(stderr, msg, ap);
1047 outcslow('\n', stderr);
1051 * Exverror is called to raise the error exception. If the second argument
1052 * is not NULL then error prints an error message using printf style
1053 * formatting. It then raises the error exception.
1055 static void ash_vmsg_and_raise(int, const char *, va_list) NORETURN;
1057 ash_vmsg_and_raise(int cond, const char *msg, va_list ap)
1061 TRACE(("ash_vmsg_and_raise(%d, \"", cond));
1063 TRACE(("\") pid=%d\n", getpid()));
1065 TRACE(("ash_vmsg_and_raise(%d, NULL) pid=%d\n", cond, getpid()));
1070 flush_stdout_stderr();
1071 raise_exception(cond);
1075 static void ash_msg_and_raise_error(const char *, ...) NORETURN;
1077 ash_msg_and_raise_error(const char *msg, ...)
1082 ash_vmsg_and_raise(EXERROR, msg, ap);
1087 static void ash_msg_and_raise(int, const char *, ...) NORETURN;
1089 ash_msg_and_raise(int cond, const char *msg, ...)
1094 ash_vmsg_and_raise(cond, msg, ap);
1100 * error/warning routines for external builtins
1103 ash_msg(const char *fmt, ...)
1113 * Return a string describing an error. The returned string may be a
1114 * pointer to a static buffer that will be overwritten on the next call.
1115 * Action describes the operation that got the error.
1118 errmsg(int e, const char *em)
1120 if (e == ENOENT || e == ENOTDIR) {
1127 /* ============ Memory allocation */
1130 * It appears that grabstackstr() will barf with such alignments
1131 * because stalloc() will return a string allocated in a new stackblock.
1133 #define SHELL_ALIGN(nbytes) (((nbytes) + SHELL_SIZE) & ~SHELL_SIZE)
1135 /* Most machines require the value returned from malloc to be aligned
1136 * in some way. The following macro will get this right
1137 * on many machines. */
1138 SHELL_SIZE = sizeof(union {int i; char *cp; double d; }) - 1,
1139 /* Minimum size of a block */
1140 MINSIZE = SHELL_ALIGN(504),
1143 struct stack_block {
1144 struct stack_block *prev;
1145 char space[MINSIZE];
1149 struct stack_block *stackp;
1152 struct stackmark *marknext;
1156 struct globals_memstack {
1157 struct stack_block *g_stackp; // = &stackbase;
1158 struct stackmark *markp;
1159 char *g_stacknxt; // = stackbase.space;
1160 char *sstrend; // = stackbase.space + MINSIZE;
1161 size_t g_stacknleft; // = MINSIZE;
1162 int herefd; // = -1;
1163 struct stack_block stackbase;
1165 extern struct globals_memstack *const ash_ptr_to_globals_memstack;
1166 #define G_memstack (*ash_ptr_to_globals_memstack)
1167 #define g_stackp (G_memstack.g_stackp )
1168 #define markp (G_memstack.markp )
1169 #define g_stacknxt (G_memstack.g_stacknxt )
1170 #define sstrend (G_memstack.sstrend )
1171 #define g_stacknleft (G_memstack.g_stacknleft)
1172 #define herefd (G_memstack.herefd )
1173 #define stackbase (G_memstack.stackbase )
1174 #define INIT_G_memstack() do { \
1175 (*(struct globals_memstack**)&ash_ptr_to_globals_memstack) = xzalloc(sizeof(G_memstack)); \
1177 g_stackp = &stackbase; \
1178 g_stacknxt = stackbase.space; \
1179 g_stacknleft = MINSIZE; \
1180 sstrend = stackbase.space + MINSIZE; \
1184 #define stackblock() ((void *)g_stacknxt)
1185 #define stackblocksize() g_stacknleft
1189 ckrealloc(void * p, size_t nbytes)
1191 p = realloc(p, nbytes);
1193 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1198 ckmalloc(size_t nbytes)
1200 return ckrealloc(NULL, nbytes);
1204 ckzalloc(size_t nbytes)
1206 return memset(ckmalloc(nbytes), 0, nbytes);
1210 * Make a copy of a string in safe storage.
1213 ckstrdup(const char *s)
1215 char *p = strdup(s);
1217 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1222 * Parse trees for commands are allocated in lifo order, so we use a stack
1223 * to make this more efficient, and also to avoid all sorts of exception
1224 * handling code to handle interrupts in the middle of a parse.
1226 * The size 504 was chosen because the Ultrix malloc handles that size
1230 stalloc(size_t nbytes)
1235 aligned = SHELL_ALIGN(nbytes);
1236 if (aligned > g_stacknleft) {
1239 struct stack_block *sp;
1241 blocksize = aligned;
1242 if (blocksize < MINSIZE)
1243 blocksize = MINSIZE;
1244 len = sizeof(struct stack_block) - MINSIZE + blocksize;
1245 if (len < blocksize)
1246 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1249 sp->prev = g_stackp;
1250 g_stacknxt = sp->space;
1251 g_stacknleft = blocksize;
1252 sstrend = g_stacknxt + blocksize;
1257 g_stacknxt += aligned;
1258 g_stacknleft -= aligned;
1263 stzalloc(size_t nbytes)
1265 return memset(stalloc(nbytes), 0, nbytes);
1272 if (!p || (g_stacknxt < (char *)p) || ((char *)p < g_stackp->space)) {
1273 write(STDERR_FILENO, "stunalloc\n", 10);
1277 g_stacknleft += g_stacknxt - (char *)p;
1282 * Like strdup but works with the ash stack.
1285 ststrdup(const char *p)
1287 size_t len = strlen(p) + 1;
1288 return memcpy(stalloc(len), p, len);
1292 setstackmark(struct stackmark *mark)
1294 mark->stackp = g_stackp;
1295 mark->stacknxt = g_stacknxt;
1296 mark->stacknleft = g_stacknleft;
1297 mark->marknext = markp;
1302 popstackmark(struct stackmark *mark)
1304 struct stack_block *sp;
1310 markp = mark->marknext;
1311 while (g_stackp != mark->stackp) {
1313 g_stackp = sp->prev;
1316 g_stacknxt = mark->stacknxt;
1317 g_stacknleft = mark->stacknleft;
1318 sstrend = mark->stacknxt + mark->stacknleft;
1323 * When the parser reads in a string, it wants to stick the string on the
1324 * stack and only adjust the stack pointer when it knows how big the
1325 * string is. Stackblock (defined in stack.h) returns a pointer to a block
1326 * of space on top of the stack and stackblocklen returns the length of
1327 * this block. Growstackblock will grow this space by at least one byte,
1328 * possibly moving it (like realloc). Grabstackblock actually allocates the
1329 * part of the block that has been used.
1332 growstackblock(void)
1336 newlen = g_stacknleft * 2;
1337 if (newlen < g_stacknleft)
1338 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1342 if (g_stacknxt == g_stackp->space && g_stackp != &stackbase) {
1343 struct stack_block *oldstackp;
1344 struct stackmark *xmark;
1345 struct stack_block *sp;
1346 struct stack_block *prevstackp;
1350 oldstackp = g_stackp;
1352 prevstackp = sp->prev;
1353 grosslen = newlen + sizeof(struct stack_block) - MINSIZE;
1354 sp = ckrealloc(sp, grosslen);
1355 sp->prev = prevstackp;
1357 g_stacknxt = sp->space;
1358 g_stacknleft = newlen;
1359 sstrend = sp->space + newlen;
1362 * Stack marks pointing to the start of the old block
1363 * must be relocated to point to the new block
1366 while (xmark != NULL && xmark->stackp == oldstackp) {
1367 xmark->stackp = g_stackp;
1368 xmark->stacknxt = g_stacknxt;
1369 xmark->stacknleft = g_stacknleft;
1370 xmark = xmark->marknext;
1374 char *oldspace = g_stacknxt;
1375 size_t oldlen = g_stacknleft;
1376 char *p = stalloc(newlen);
1378 /* free the space we just allocated */
1379 g_stacknxt = memcpy(p, oldspace, oldlen);
1380 g_stacknleft += newlen;
1385 grabstackblock(size_t len)
1387 len = SHELL_ALIGN(len);
1389 g_stacknleft -= len;
1393 * The following routines are somewhat easier to use than the above.
1394 * The user declares a variable of type STACKSTR, which may be declared
1395 * to be a register. The macro STARTSTACKSTR initializes things. Then
1396 * the user uses the macro STPUTC to add characters to the string. In
1397 * effect, STPUTC(c, p) is the same as *p++ = c except that the stack is
1398 * grown as necessary. When the user is done, she can just leave the
1399 * string there and refer to it using stackblock(). Or she can allocate
1400 * the space for it using grabstackstr(). If it is necessary to allow
1401 * someone else to use the stack temporarily and then continue to grow
1402 * the string, the user should use grabstack to allocate the space, and
1403 * then call ungrabstr(p) to return to the previous mode of operation.
1405 * USTPUTC is like STPUTC except that it doesn't check for overflow.
1406 * CHECKSTACKSPACE can be called before USTPUTC to ensure that there
1407 * is space for at least one character.
1412 size_t len = stackblocksize();
1413 if (herefd >= 0 && len >= 1024) {
1414 full_write(herefd, stackblock(), len);
1415 return stackblock();
1418 return (char *)stackblock() + len;
1422 * Called from CHECKSTRSPACE.
1425 makestrspace(size_t newlen, char *p)
1427 size_t len = p - g_stacknxt;
1428 size_t size = stackblocksize();
1433 size = stackblocksize();
1435 if (nleft >= newlen)
1439 return (char *)stackblock() + len;
1443 stack_nputstr(const char *s, size_t n, char *p)
1445 p = makestrspace(n, p);
1446 p = (char *)memcpy(p, s, n) + n;
1451 stack_putstr(const char *s, char *p)
1453 return stack_nputstr(s, strlen(s), p);
1457 _STPUTC(int c, char *p)
1465 #define STARTSTACKSTR(p) ((p) = stackblock())
1466 #define STPUTC(c, p) ((p) = _STPUTC((c), (p)))
1467 #define CHECKSTRSPACE(n, p) do { \
1470 size_t m = sstrend - q; \
1472 (p) = makestrspace(l, q); \
1474 #define USTPUTC(c, p) (*(p)++ = (c))
1475 #define STACKSTRNUL(p) do { \
1476 if ((p) == sstrend) \
1477 (p) = growstackstr(); \
1480 #define STUNPUTC(p) (--(p))
1481 #define STTOPC(p) ((p)[-1])
1482 #define STADJUST(amount, p) ((p) += (amount))
1484 #define grabstackstr(p) stalloc((char *)(p) - (char *)stackblock())
1485 #define ungrabstackstr(s, p) stunalloc(s)
1486 #define stackstrend() ((void *)sstrend)
1489 /* ============ String helpers */
1492 * prefix -- see if pfx is a prefix of string.
1495 prefix(const char *string, const char *pfx)
1498 if (*pfx++ != *string++)
1501 return (char *) string;
1505 * Check for a valid number. This should be elsewhere.
1508 is_number(const char *p)
1513 } while (*++p != '\0');
1518 * Convert a string of digits to an integer, printing an error message on
1522 number(const char *s)
1525 ash_msg_and_raise_error(illnum, s);
1530 * Produce a possibly single quoted string suitable as input to the shell.
1531 * The return string is allocated on the stack.
1534 single_quote(const char *s)
1544 len = strchrnul(s, '\'') - s;
1546 q = p = makestrspace(len + 3, p);
1549 q = (char *)memcpy(q, s, len) + len;
1555 len = strspn(s, "'");
1559 q = p = makestrspace(len + 3, p);
1562 q = (char *)memcpy(q, s, len) + len;
1571 return stackblock();
1575 /* ============ nextopt */
1577 static char **argptr; /* argument list for builtin commands */
1578 static char *optionarg; /* set by nextopt (like getopt) */
1579 static char *optptr; /* used by nextopt */
1582 * XXX - should get rid of. Have all builtins use getopt(3).
1583 * The library getopt must have the BSD extension static variable
1584 * "optreset", otherwise it can't be used within the shell safely.
1586 * Standard option processing (a la getopt) for builtin routines.
1587 * The only argument that is passed to nextopt is the option string;
1588 * the other arguments are unnecessary. It returns the character,
1589 * or '\0' on end of input.
1592 nextopt(const char *optstring)
1599 if (p == NULL || *p == '\0') {
1600 /* We ate entire "-param", take next one */
1606 if (*++p == '\0') /* just "-" ? */
1609 if (LONE_DASH(p)) /* "--" ? */
1611 /* p => next "-param" */
1613 /* p => some option char in the middle of a "-param" */
1615 for (q = optstring; *q != c;) {
1617 ash_msg_and_raise_error("illegal option -%c", c);
1625 ash_msg_and_raise_error("no arg for -%c option", c);
1635 /* ============ Shell variables */
1638 * The parsefile structure pointed to by the global variable parsefile
1639 * contains information about the current file being read.
1642 int nparam; /* # of positional parameters (without $0) */
1643 #if ENABLE_ASH_GETOPTS
1644 int optind; /* next parameter to be processed by getopts */
1645 int optoff; /* used by getopts */
1647 unsigned char malloced; /* if parameter list dynamically allocated */
1648 char **p; /* parameter list */
1652 * Free the list of positional parameters.
1655 freeparam(volatile struct shparam *param)
1657 if (param->malloced) {
1659 ap = ap1 = param->p;
1666 #if ENABLE_ASH_GETOPTS
1667 static void getoptsreset(const char *value);
1671 struct var *next; /* next entry in hash list */
1672 int flags; /* flags are defined above */
1673 const char *text; /* name=value */
1674 void (*func)(const char *); /* function to be called when */
1675 /* the variable gets set/unset */
1679 struct localvar *next; /* next local variable in list */
1680 struct var *vp; /* the variable that was made local */
1681 int flags; /* saved flags */
1682 const char *text; /* saved text */
1686 #define VEXPORT 0x01 /* variable is exported */
1687 #define VREADONLY 0x02 /* variable cannot be modified */
1688 #define VSTRFIXED 0x04 /* variable struct is statically allocated */
1689 #define VTEXTFIXED 0x08 /* text is statically allocated */
1690 #define VSTACK 0x10 /* text is allocated on the stack */
1691 #define VUNSET 0x20 /* the variable is not set */
1692 #define VNOFUNC 0x40 /* don't call the callback function */
1693 #define VNOSET 0x80 /* do not set variable - just readonly test */
1694 #define VNOSAVE 0x100 /* when text is on the heap before setvareq */
1695 #if ENABLE_ASH_RANDOM_SUPPORT
1696 # define VDYNAMIC 0x200 /* dynamic variable */
1702 static const char defifsvar[] ALIGN1 = "IFS= \t\n";
1703 #define defifs (defifsvar + 4)
1705 static const char defifs[] ALIGN1 = " \t\n";
1709 /* Need to be before varinit_data[] */
1710 #if ENABLE_LOCALE_SUPPORT
1712 change_lc_all(const char *value)
1714 if (value && *value != '\0')
1715 setlocale(LC_ALL, value);
1718 change_lc_ctype(const char *value)
1720 if (value && *value != '\0')
1721 setlocale(LC_CTYPE, value);
1725 static void chkmail(void);
1726 static void changemail(const char *);
1728 static void changepath(const char *);
1729 #if ENABLE_ASH_RANDOM_SUPPORT
1730 static void change_random(const char *);
1733 static const struct {
1736 void (*func)(const char *);
1737 } varinit_data[] = {
1739 { VSTRFIXED|VTEXTFIXED , defifsvar , NULL },
1741 { VSTRFIXED|VTEXTFIXED|VUNSET, "IFS\0" , NULL },
1744 { VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL\0" , changemail },
1745 { VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH\0", changemail },
1747 { VSTRFIXED|VTEXTFIXED , bb_PATH_root_path, changepath },
1748 { VSTRFIXED|VTEXTFIXED , "PS1=$ " , NULL },
1749 { VSTRFIXED|VTEXTFIXED , "PS2=> " , NULL },
1750 { VSTRFIXED|VTEXTFIXED , "PS4=+ " , NULL },
1751 #if ENABLE_ASH_GETOPTS
1752 { VSTRFIXED|VTEXTFIXED , "OPTIND=1" , getoptsreset },
1754 #if ENABLE_ASH_RANDOM_SUPPORT
1755 { VSTRFIXED|VTEXTFIXED|VUNSET|VDYNAMIC, "RANDOM\0", change_random },
1757 #if ENABLE_LOCALE_SUPPORT
1758 { VSTRFIXED|VTEXTFIXED|VUNSET, "LC_ALL\0" , change_lc_all },
1759 { VSTRFIXED|VTEXTFIXED|VUNSET, "LC_CTYPE\0", change_lc_ctype },
1761 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
1762 { VSTRFIXED|VTEXTFIXED|VUNSET, "HISTFILE\0", NULL },
1768 struct globals_var {
1769 struct shparam shellparam; /* $@ current positional parameters */
1770 struct redirtab *redirlist;
1772 int preverrout_fd; /* save fd2 before print debug if xflag is set. */
1773 struct var *vartab[VTABSIZE];
1774 struct var varinit[ARRAY_SIZE(varinit_data)];
1776 extern struct globals_var *const ash_ptr_to_globals_var;
1777 #define G_var (*ash_ptr_to_globals_var)
1778 #define shellparam (G_var.shellparam )
1779 //#define redirlist (G_var.redirlist )
1780 #define g_nullredirs (G_var.g_nullredirs )
1781 #define preverrout_fd (G_var.preverrout_fd)
1782 #define vartab (G_var.vartab )
1783 #define varinit (G_var.varinit )
1784 #define INIT_G_var() do { \
1786 (*(struct globals_var**)&ash_ptr_to_globals_var) = xzalloc(sizeof(G_var)); \
1788 for (i = 0; i < ARRAY_SIZE(varinit_data); i++) { \
1789 varinit[i].flags = varinit_data[i].flags; \
1790 varinit[i].text = varinit_data[i].text; \
1791 varinit[i].func = varinit_data[i].func; \
1795 #define vifs varinit[0]
1797 # define vmail (&vifs)[1]
1798 # define vmpath (&vmail)[1]
1799 # define vpath (&vmpath)[1]
1801 # define vpath (&vifs)[1]
1803 #define vps1 (&vpath)[1]
1804 #define vps2 (&vps1)[1]
1805 #define vps4 (&vps2)[1]
1806 #if ENABLE_ASH_GETOPTS
1807 # define voptind (&vps4)[1]
1808 # if ENABLE_ASH_RANDOM_SUPPORT
1809 # define vrandom (&voptind)[1]
1812 # if ENABLE_ASH_RANDOM_SUPPORT
1813 # define vrandom (&vps4)[1]
1818 * The following macros access the values of the above variables.
1819 * They have to skip over the name. They return the null string
1820 * for unset variables.
1822 #define ifsval() (vifs.text + 4)
1823 #define ifsset() ((vifs.flags & VUNSET) == 0)
1825 # define mailval() (vmail.text + 5)
1826 # define mpathval() (vmpath.text + 9)
1827 # define mpathset() ((vmpath.flags & VUNSET) == 0)
1829 #define pathval() (vpath.text + 5)
1830 #define ps1val() (vps1.text + 4)
1831 #define ps2val() (vps2.text + 4)
1832 #define ps4val() (vps4.text + 4)
1833 #if ENABLE_ASH_GETOPTS
1834 # define optindval() (voptind.text + 7)
1838 #define is_name(c) ((c) == '_' || isalpha((unsigned char)(c)))
1839 #define is_in_name(c) ((c) == '_' || isalnum((unsigned char)(c)))
1841 #if ENABLE_ASH_GETOPTS
1843 getoptsreset(const char *value)
1845 shellparam.optind = number(value);
1846 shellparam.optoff = -1;
1851 * Return of a legal variable name (a letter or underscore followed by zero or
1852 * more letters, underscores, and digits).
1855 endofname(const char *name)
1863 if (!is_in_name(*p))
1870 * Compares two strings up to the first = or '\0'. The first
1871 * string must be terminated by '='; the second may be terminated by
1872 * either '=' or '\0'.
1875 varcmp(const char *p, const char *q)
1879 while ((c = *p) == (d = *q)) {
1894 varequal(const char *a, const char *b)
1896 return !varcmp(a, b);
1900 * Find the appropriate entry in the hash table from the name.
1902 static struct var **
1903 hashvar(const char *p)
1907 hashval = ((unsigned char) *p) << 4;
1908 while (*p && *p != '=')
1909 hashval += (unsigned char) *p++;
1910 return &vartab[hashval % VTABSIZE];
1914 vpcmp(const void *a, const void *b)
1916 return varcmp(*(const char **)a, *(const char **)b);
1920 * This routine initializes the builtin variables.
1930 * PS1 depends on uid
1932 #if ENABLE_FEATURE_EDITING && ENABLE_FEATURE_EDITING_FANCY_PROMPT
1933 vps1.text = "PS1=\\w \\$ ";
1936 vps1.text = "PS1=# ";
1939 end = vp + ARRAY_SIZE(varinit);
1941 vpp = hashvar(vp->text);
1944 } while (++vp < end);
1947 static struct var **
1948 findvar(struct var **vpp, const char *name)
1950 for (; *vpp; vpp = &(*vpp)->next) {
1951 if (varequal((*vpp)->text, name)) {
1959 * Find the value of a variable. Returns NULL if not set.
1962 lookupvar(const char *name)
1966 v = *findvar(hashvar(name), name);
1968 #if ENABLE_ASH_RANDOM_SUPPORT
1970 * Dynamic variables are implemented roughly the same way they are
1971 * in bash. Namely, they're "special" so long as they aren't unset.
1972 * As soon as they're unset, they're no longer dynamic, and dynamic
1973 * lookup will no longer happen at that point. -- PFM.
1975 if ((v->flags & VDYNAMIC))
1978 if (!(v->flags & VUNSET))
1979 return strchrnul(v->text, '=') + 1;
1985 * Search the environment of a builtin command.
1988 bltinlookup(const char *name)
1992 for (sp = cmdenviron; sp; sp = sp->next) {
1993 if (varequal(sp->text, name))
1994 return strchrnul(sp->text, '=') + 1;
1996 return lookupvar(name);
2000 * Same as setvar except that the variable and value are passed in
2001 * the first argument as name=value. Since the first argument will
2002 * be actually stored in the table, it should not be a string that
2004 * Called with interrupts off.
2007 setvareq(char *s, int flags)
2009 struct var *vp, **vpp;
2012 flags |= (VEXPORT & (((unsigned) (1 - aflag)) - 1));
2013 vp = *findvar(vpp, s);
2015 if ((vp->flags & (VREADONLY|VDYNAMIC)) == VREADONLY) {
2018 if (flags & VNOSAVE)
2021 ash_msg_and_raise_error("%.*s: is read only", strchrnul(n, '=') - n, n);
2027 if (vp->func && (flags & VNOFUNC) == 0)
2028 (*vp->func)(strchrnul(s, '=') + 1);
2030 if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
2031 free((char*)vp->text);
2033 flags |= vp->flags & ~(VTEXTFIXED|VSTACK|VNOSAVE|VUNSET);
2038 vp = ckzalloc(sizeof(*vp));
2040 /*vp->func = NULL; - ckzalloc did it */
2043 if (!(flags & (VTEXTFIXED|VSTACK|VNOSAVE)))
2050 * Set the value of a variable. The flags argument is ored with the
2051 * flags of the variable. If val is NULL, the variable is unset.
2054 setvar(const char *name, const char *val, int flags)
2061 q = endofname(name);
2062 p = strchrnul(q, '=');
2064 if (!namelen || p != q)
2065 ash_msg_and_raise_error("%.*s: bad variable name", namelen, name);
2070 vallen = strlen(val);
2073 nameeq = ckmalloc(namelen + vallen + 2);
2074 p = (char *)memcpy(nameeq, name, namelen) + namelen;
2077 p = (char *)memcpy(p, val, vallen) + vallen;
2080 setvareq(nameeq, flags | VNOSAVE);
2084 #if ENABLE_ASH_GETOPTS
2086 * Safe version of setvar, returns 1 on success 0 on failure.
2089 setvarsafe(const char *name, const char *val, int flags)
2092 volatile int saveint;
2093 struct jmploc *volatile savehandler = exception_handler;
2094 struct jmploc jmploc;
2097 if (setjmp(jmploc.loc))
2100 exception_handler = &jmploc;
2101 setvar(name, val, flags);
2104 exception_handler = savehandler;
2105 RESTORE_INT(saveint);
2111 * Unset the specified variable.
2114 unsetvar(const char *s)
2120 vpp = findvar(hashvar(s), s);
2124 int flags = vp->flags;
2127 if (flags & VREADONLY)
2129 #if ENABLE_ASH_RANDOM_SUPPORT
2130 vp->flags &= ~VDYNAMIC;
2134 if ((flags & VSTRFIXED) == 0) {
2136 if ((flags & (VTEXTFIXED|VSTACK)) == 0)
2137 free((char*)vp->text);
2143 vp->flags &= ~VEXPORT;
2153 * Process a linked list of variable assignments.
2156 listsetvar(struct strlist *list_set_var, int flags)
2158 struct strlist *lp = list_set_var;
2164 setvareq(lp->text, flags);
2171 * Generate a list of variables satisfying the given conditions.
2174 listvars(int on, int off, char ***end)
2185 for (vp = *vpp; vp; vp = vp->next) {
2186 if ((vp->flags & mask) == on) {
2187 if (ep == stackstrend())
2188 ep = growstackstr();
2189 *ep++ = (char *) vp->text;
2192 } while (++vpp < vartab + VTABSIZE);
2193 if (ep == stackstrend())
2194 ep = growstackstr();
2198 return grabstackstr(ep);
2202 /* ============ Path search helper
2204 * The variable path (passed by reference) should be set to the start
2205 * of the path before the first call; padvance will update
2206 * this value as it proceeds. Successive calls to padvance will return
2207 * the possible path expansions in sequence. If an option (indicated by
2208 * a percent sign) appears in the path entry then the global variable
2209 * pathopt will be set to point to it; otherwise pathopt will be set to
2212 static const char *pathopt; /* set by padvance */
2215 padvance(const char **path, const char *name)
2225 for (p = start; *p && *p != ':' && *p != '%'; p++)
2227 len = p - start + strlen(name) + 2; /* "2" is for '/' and '\0' */
2228 while (stackblocksize() < len)
2232 memcpy(q, start, p - start);
2240 while (*p && *p != ':')
2247 return stalloc(len);
2251 /* ============ Prompt */
2253 static smallint doprompt; /* if set, prompt the user */
2254 static smallint needprompt; /* true if interactive and at start of line */
2256 #if ENABLE_FEATURE_EDITING
2257 static line_input_t *line_input_state;
2258 static const char *cmdedit_prompt;
2260 putprompt(const char *s)
2262 if (ENABLE_ASH_EXPAND_PRMT) {
2263 free((char*)cmdedit_prompt);
2264 cmdedit_prompt = ckstrdup(s);
2271 putprompt(const char *s)
2277 #if ENABLE_ASH_EXPAND_PRMT
2278 /* expandstr() needs parsing machinery, so it is far away ahead... */
2279 static const char *expandstr(const char *ps);
2281 #define expandstr(s) s
2285 setprompt(int whichprompt)
2288 #if ENABLE_ASH_EXPAND_PRMT
2289 struct stackmark smark;
2294 switch (whichprompt) {
2304 #if ENABLE_ASH_EXPAND_PRMT
2305 setstackmark(&smark);
2306 stalloc(stackblocksize());
2308 putprompt(expandstr(prompt));
2309 #if ENABLE_ASH_EXPAND_PRMT
2310 popstackmark(&smark);
2315 /* ============ The cd and pwd commands */
2317 #define CD_PHYSICAL 1
2320 static int docd(const char *, int);
2329 while ((i = nextopt("LP"))) {
2331 flags ^= CD_PHYSICAL;
2340 * Update curdir (the name of the current directory) in response to a
2344 updatepwd(const char *dir)
2351 cdcomppath = ststrdup(dir);
2354 if (curdir == nullstr)
2356 new = stack_putstr(curdir, new);
2358 new = makestrspace(strlen(dir) + 2, new);
2359 lim = (char *)stackblock() + 1;
2363 if (new > lim && *lim == '/')
2368 if (dir[1] == '/' && dir[2] != '/') {
2374 p = strtok(cdcomppath, "/");
2378 if (p[1] == '.' && p[2] == '\0') {
2390 new = stack_putstr(p, new);
2398 return stackblock();
2402 * Find out what the current directory is. If we already know the current
2403 * directory, this routine returns immediately.
2408 char *dir = getcwd(NULL, 0); /* huh, using glibc extension? */
2409 return dir ? dir : nullstr;
2413 setpwd(const char *val, int setold)
2417 oldcur = dir = curdir;
2420 setvar("OLDPWD", oldcur, VEXPORT);
2423 if (physdir != nullstr) {
2424 if (physdir != oldcur)
2428 if (oldcur == val || !val) {
2434 dir = ckstrdup(val);
2435 if (oldcur != dir && oldcur != nullstr) {
2440 setvar("PWD", dir, VEXPORT);
2443 static void hashcd(void);
2446 * Actually do the chdir. We also call hashcd to let the routines in exec.c
2447 * know that the current directory has changed.
2450 docd(const char *dest, int flags)
2452 const char *dir = 0;
2455 TRACE(("docd(\"%s\", %d) called\n", dest, flags));
2458 if (!(flags & CD_PHYSICAL)) {
2459 dir = updatepwd(dest);
2474 cdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
2486 dest = bltinlookup(homestr);
2487 else if (LONE_DASH(dest)) {
2488 dest = bltinlookup("OLDPWD");
2510 path = bltinlookup("CDPATH");
2519 p = padvance(&path, dest);
2520 if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
2524 if (!docd(p, flags))
2529 ash_msg_and_raise_error("can't cd to %s", dest);
2532 if (flags & CD_PRINT)
2533 out1fmt(snlfmt, curdir);
2538 pwdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
2541 const char *dir = curdir;
2545 if (physdir == nullstr)
2549 out1fmt(snlfmt, dir);
2554 /* ============ ... */
2556 #define IBUFSIZ COMMON_BUFSIZE
2557 #define basebuf bb_common_bufsiz1 /* buffer for top level input file */
2559 /* Syntax classes */
2560 #define CWORD 0 /* character is nothing special */
2561 #define CNL 1 /* newline character */
2562 #define CBACK 2 /* a backslash character */
2563 #define CSQUOTE 3 /* single quote */
2564 #define CDQUOTE 4 /* double quote */
2565 #define CENDQUOTE 5 /* a terminating quote */
2566 #define CBQUOTE 6 /* backwards single quote */
2567 #define CVAR 7 /* a dollar sign */
2568 #define CENDVAR 8 /* a '}' character */
2569 #define CLP 9 /* a left paren in arithmetic */
2570 #define CRP 10 /* a right paren in arithmetic */
2571 #define CENDFILE 11 /* end of file */
2572 #define CCTL 12 /* like CWORD, except it must be escaped */
2573 #define CSPCL 13 /* these terminate a word */
2574 #define CIGN 14 /* character should be ignored */
2576 #if ENABLE_ASH_ALIAS
2580 #define PEOA_OR_PEOF PEOA
2584 #define PEOA_OR_PEOF PEOF
2587 /* number syntax index */
2588 #define BASESYNTAX 0 /* not in quotes */
2589 #define DQSYNTAX 1 /* in double quotes */
2590 #define SQSYNTAX 2 /* in single quotes */
2591 #define ARISYNTAX 3 /* in arithmetic */
2592 #define PSSYNTAX 4 /* prompt */
2594 #if ENABLE_ASH_OPTIMIZE_FOR_SIZE
2595 #define USE_SIT_FUNCTION
2598 #if ENABLE_ASH_MATH_SUPPORT
2599 static const char S_I_T[][4] = {
2600 #if ENABLE_ASH_ALIAS
2601 { CSPCL, CIGN, CIGN, CIGN }, /* 0, PEOA */
2603 { CSPCL, CWORD, CWORD, CWORD }, /* 1, ' ' */
2604 { CNL, CNL, CNL, CNL }, /* 2, \n */
2605 { CWORD, CCTL, CCTL, CWORD }, /* 3, !*-/:=?[]~ */
2606 { CDQUOTE, CENDQUOTE, CWORD, CWORD }, /* 4, '"' */
2607 { CVAR, CVAR, CWORD, CVAR }, /* 5, $ */
2608 { CSQUOTE, CWORD, CENDQUOTE, CWORD }, /* 6, "'" */
2609 { CSPCL, CWORD, CWORD, CLP }, /* 7, ( */
2610 { CSPCL, CWORD, CWORD, CRP }, /* 8, ) */
2611 { CBACK, CBACK, CCTL, CBACK }, /* 9, \ */
2612 { CBQUOTE, CBQUOTE, CWORD, CBQUOTE }, /* 10, ` */
2613 { CENDVAR, CENDVAR, CWORD, CENDVAR }, /* 11, } */
2614 #ifndef USE_SIT_FUNCTION
2615 { CENDFILE, CENDFILE, CENDFILE, CENDFILE }, /* 12, PEOF */
2616 { CWORD, CWORD, CWORD, CWORD }, /* 13, 0-9A-Za-z */
2617 { CCTL, CCTL, CCTL, CCTL } /* 14, CTLESC ... */
2621 static const char S_I_T[][3] = {
2622 #if ENABLE_ASH_ALIAS
2623 { CSPCL, CIGN, CIGN }, /* 0, PEOA */
2625 { CSPCL, CWORD, CWORD }, /* 1, ' ' */
2626 { CNL, CNL, CNL }, /* 2, \n */
2627 { CWORD, CCTL, CCTL }, /* 3, !*-/:=?[]~ */
2628 { CDQUOTE, CENDQUOTE, CWORD }, /* 4, '"' */
2629 { CVAR, CVAR, CWORD }, /* 5, $ */
2630 { CSQUOTE, CWORD, CENDQUOTE }, /* 6, "'" */
2631 { CSPCL, CWORD, CWORD }, /* 7, ( */
2632 { CSPCL, CWORD, CWORD }, /* 8, ) */
2633 { CBACK, CBACK, CCTL }, /* 9, \ */
2634 { CBQUOTE, CBQUOTE, CWORD }, /* 10, ` */
2635 { CENDVAR, CENDVAR, CWORD }, /* 11, } */
2636 #ifndef USE_SIT_FUNCTION
2637 { CENDFILE, CENDFILE, CENDFILE }, /* 12, PEOF */
2638 { CWORD, CWORD, CWORD }, /* 13, 0-9A-Za-z */
2639 { CCTL, CCTL, CCTL } /* 14, CTLESC ... */
2642 #endif /* ASH_MATH_SUPPORT */
2644 #ifdef USE_SIT_FUNCTION
2647 SIT(int c, int syntax)
2649 static const char spec_symbls[] ALIGN1 = "\t\n !\"$&'()*-/:;<=>?[\\]`|}~";
2650 #if ENABLE_ASH_ALIAS
2651 static const char syntax_index_table[] ALIGN1 = {
2652 1, 2, 1, 3, 4, 5, 1, 6, /* "\t\n !\"$&'" */
2653 7, 8, 3, 3, 3, 3, 1, 1, /* "()*-/:;<" */
2654 3, 1, 3, 3, 9, 3, 10, 1, /* "=>?[\\]`|" */
2658 static const char syntax_index_table[] ALIGN1 = {
2659 0, 1, 0, 2, 3, 4, 0, 5, /* "\t\n !\"$&'" */
2660 6, 7, 2, 2, 2, 2, 0, 0, /* "()*-/:;<" */
2661 2, 0, 2, 2, 8, 2, 9, 0, /* "=>?[\\]`|" */
2668 if (c == PEOF) /* 2^8+2 */
2670 #if ENABLE_ASH_ALIAS
2671 if (c == PEOA) /* 2^8+1 */
2675 #define U_C(c) ((unsigned char)(c))
2677 if ((unsigned char)c >= (unsigned char)(CTLESC)
2678 && (unsigned char)c <= (unsigned char)(CTLQUOTEMARK)
2682 s = strchrnul(spec_symbls, c);
2685 indx = syntax_index_table[s - spec_symbls];
2687 return S_I_T[indx][syntax];
2690 #else /* !USE_SIT_FUNCTION */
2692 #if ENABLE_ASH_ALIAS
2693 #define CSPCL_CIGN_CIGN_CIGN 0
2694 #define CSPCL_CWORD_CWORD_CWORD 1
2695 #define CNL_CNL_CNL_CNL 2
2696 #define CWORD_CCTL_CCTL_CWORD 3
2697 #define CDQUOTE_CENDQUOTE_CWORD_CWORD 4
2698 #define CVAR_CVAR_CWORD_CVAR 5
2699 #define CSQUOTE_CWORD_CENDQUOTE_CWORD 6
2700 #define CSPCL_CWORD_CWORD_CLP 7
2701 #define CSPCL_CWORD_CWORD_CRP 8
2702 #define CBACK_CBACK_CCTL_CBACK 9
2703 #define CBQUOTE_CBQUOTE_CWORD_CBQUOTE 10
2704 #define CENDVAR_CENDVAR_CWORD_CENDVAR 11
2705 #define CENDFILE_CENDFILE_CENDFILE_CENDFILE 12
2706 #define CWORD_CWORD_CWORD_CWORD 13
2707 #define CCTL_CCTL_CCTL_CCTL 14
2709 #define CSPCL_CWORD_CWORD_CWORD 0
2710 #define CNL_CNL_CNL_CNL 1
2711 #define CWORD_CCTL_CCTL_CWORD 2
2712 #define CDQUOTE_CENDQUOTE_CWORD_CWORD 3
2713 #define CVAR_CVAR_CWORD_CVAR 4
2714 #define CSQUOTE_CWORD_CENDQUOTE_CWORD 5
2715 #define CSPCL_CWORD_CWORD_CLP 6
2716 #define CSPCL_CWORD_CWORD_CRP 7
2717 #define CBACK_CBACK_CCTL_CBACK 8
2718 #define CBQUOTE_CBQUOTE_CWORD_CBQUOTE 9
2719 #define CENDVAR_CENDVAR_CWORD_CENDVAR 10
2720 #define CENDFILE_CENDFILE_CENDFILE_CENDFILE 11
2721 #define CWORD_CWORD_CWORD_CWORD 12
2722 #define CCTL_CCTL_CCTL_CCTL 13
2725 static const char syntax_index_table[258] = {
2726 /* BASESYNTAX_DQSYNTAX_SQSYNTAX_ARISYNTAX */
2727 /* 0 PEOF */ CENDFILE_CENDFILE_CENDFILE_CENDFILE,
2728 #if ENABLE_ASH_ALIAS
2729 /* 1 PEOA */ CSPCL_CIGN_CIGN_CIGN,
2731 /* 2 -128 0x80 */ CWORD_CWORD_CWORD_CWORD,
2732 /* 3 -127 CTLESC */ CCTL_CCTL_CCTL_CCTL,
2733 /* 4 -126 CTLVAR */ CCTL_CCTL_CCTL_CCTL,
2734 /* 5 -125 CTLENDVAR */ CCTL_CCTL_CCTL_CCTL,
2735 /* 6 -124 CTLBACKQ */ CCTL_CCTL_CCTL_CCTL,
2736 /* 7 -123 CTLQUOTE */ CCTL_CCTL_CCTL_CCTL,
2737 /* 8 -122 CTLARI */ CCTL_CCTL_CCTL_CCTL,
2738 /* 9 -121 CTLENDARI */ CCTL_CCTL_CCTL_CCTL,
2739 /* 10 -120 CTLQUOTEMARK */ CCTL_CCTL_CCTL_CCTL,
2740 /* 11 -119 */ CWORD_CWORD_CWORD_CWORD,
2741 /* 12 -118 */ CWORD_CWORD_CWORD_CWORD,
2742 /* 13 -117 */ CWORD_CWORD_CWORD_CWORD,
2743 /* 14 -116 */ CWORD_CWORD_CWORD_CWORD,
2744 /* 15 -115 */ CWORD_CWORD_CWORD_CWORD,
2745 /* 16 -114 */ CWORD_CWORD_CWORD_CWORD,
2746 /* 17 -113 */ CWORD_CWORD_CWORD_CWORD,
2747 /* 18 -112 */ CWORD_CWORD_CWORD_CWORD,
2748 /* 19 -111 */ CWORD_CWORD_CWORD_CWORD,
2749 /* 20 -110 */ CWORD_CWORD_CWORD_CWORD,
2750 /* 21 -109 */ CWORD_CWORD_CWORD_CWORD,
2751 /* 22 -108 */ CWORD_CWORD_CWORD_CWORD,
2752 /* 23 -107 */ CWORD_CWORD_CWORD_CWORD,
2753 /* 24 -106 */ CWORD_CWORD_CWORD_CWORD,
2754 /* 25 -105 */ CWORD_CWORD_CWORD_CWORD,
2755 /* 26 -104 */ CWORD_CWORD_CWORD_CWORD,
2756 /* 27 -103 */ CWORD_CWORD_CWORD_CWORD,
2757 /* 28 -102 */ CWORD_CWORD_CWORD_CWORD,
2758 /* 29 -101 */ CWORD_CWORD_CWORD_CWORD,
2759 /* 30 -100 */ CWORD_CWORD_CWORD_CWORD,
2760 /* 31 -99 */ CWORD_CWORD_CWORD_CWORD,
2761 /* 32 -98 */ CWORD_CWORD_CWORD_CWORD,
2762 /* 33 -97 */ CWORD_CWORD_CWORD_CWORD,
2763 /* 34 -96 */ CWORD_CWORD_CWORD_CWORD,
2764 /* 35 -95 */ CWORD_CWORD_CWORD_CWORD,
2765 /* 36 -94 */ CWORD_CWORD_CWORD_CWORD,
2766 /* 37 -93 */ CWORD_CWORD_CWORD_CWORD,
2767 /* 38 -92 */ CWORD_CWORD_CWORD_CWORD,
2768 /* 39 -91 */ CWORD_CWORD_CWORD_CWORD,
2769 /* 40 -90 */ CWORD_CWORD_CWORD_CWORD,
2770 /* 41 -89 */ CWORD_CWORD_CWORD_CWORD,
2771 /* 42 -88 */ CWORD_CWORD_CWORD_CWORD,
2772 /* 43 -87 */ CWORD_CWORD_CWORD_CWORD,
2773 /* 44 -86 */ CWORD_CWORD_CWORD_CWORD,
2774 /* 45 -85 */ CWORD_CWORD_CWORD_CWORD,
2775 /* 46 -84 */ CWORD_CWORD_CWORD_CWORD,
2776 /* 47 -83 */ CWORD_CWORD_CWORD_CWORD,
2777 /* 48 -82 */ CWORD_CWORD_CWORD_CWORD,
2778 /* 49 -81 */ CWORD_CWORD_CWORD_CWORD,
2779 /* 50 -80 */ CWORD_CWORD_CWORD_CWORD,
2780 /* 51 -79 */ CWORD_CWORD_CWORD_CWORD,
2781 /* 52 -78 */ CWORD_CWORD_CWORD_CWORD,
2782 /* 53 -77 */ CWORD_CWORD_CWORD_CWORD,
2783 /* 54 -76 */ CWORD_CWORD_CWORD_CWORD,
2784 /* 55 -75 */ CWORD_CWORD_CWORD_CWORD,
2785 /* 56 -74 */ CWORD_CWORD_CWORD_CWORD,
2786 /* 57 -73 */ CWORD_CWORD_CWORD_CWORD,
2787 /* 58 -72 */ CWORD_CWORD_CWORD_CWORD,
2788 /* 59 -71 */ CWORD_CWORD_CWORD_CWORD,
2789 /* 60 -70 */ CWORD_CWORD_CWORD_CWORD,
2790 /* 61 -69 */ CWORD_CWORD_CWORD_CWORD,
2791 /* 62 -68 */ CWORD_CWORD_CWORD_CWORD,
2792 /* 63 -67 */ CWORD_CWORD_CWORD_CWORD,
2793 /* 64 -66 */ CWORD_CWORD_CWORD_CWORD,
2794 /* 65 -65 */ CWORD_CWORD_CWORD_CWORD,
2795 /* 66 -64 */ CWORD_CWORD_CWORD_CWORD,
2796 /* 67 -63 */ CWORD_CWORD_CWORD_CWORD,
2797 /* 68 -62 */ CWORD_CWORD_CWORD_CWORD,
2798 /* 69 -61 */ CWORD_CWORD_CWORD_CWORD,
2799 /* 70 -60 */ CWORD_CWORD_CWORD_CWORD,
2800 /* 71 -59 */ CWORD_CWORD_CWORD_CWORD,
2801 /* 72 -58 */ CWORD_CWORD_CWORD_CWORD,
2802 /* 73 -57 */ CWORD_CWORD_CWORD_CWORD,
2803 /* 74 -56 */ CWORD_CWORD_CWORD_CWORD,
2804 /* 75 -55 */ CWORD_CWORD_CWORD_CWORD,
2805 /* 76 -54 */ CWORD_CWORD_CWORD_CWORD,
2806 /* 77 -53 */ CWORD_CWORD_CWORD_CWORD,
2807 /* 78 -52 */ CWORD_CWORD_CWORD_CWORD,
2808 /* 79 -51 */ CWORD_CWORD_CWORD_CWORD,
2809 /* 80 -50 */ CWORD_CWORD_CWORD_CWORD,
2810 /* 81 -49 */ CWORD_CWORD_CWORD_CWORD,
2811 /* 82 -48 */ CWORD_CWORD_CWORD_CWORD,
2812 /* 83 -47 */ CWORD_CWORD_CWORD_CWORD,
2813 /* 84 -46 */ CWORD_CWORD_CWORD_CWORD,
2814 /* 85 -45 */ CWORD_CWORD_CWORD_CWORD,
2815 /* 86 -44 */ CWORD_CWORD_CWORD_CWORD,
2816 /* 87 -43 */ CWORD_CWORD_CWORD_CWORD,
2817 /* 88 -42 */ CWORD_CWORD_CWORD_CWORD,
2818 /* 89 -41 */ CWORD_CWORD_CWORD_CWORD,
2819 /* 90 -40 */ CWORD_CWORD_CWORD_CWORD,
2820 /* 91 -39 */ CWORD_CWORD_CWORD_CWORD,
2821 /* 92 -38 */ CWORD_CWORD_CWORD_CWORD,
2822 /* 93 -37 */ CWORD_CWORD_CWORD_CWORD,
2823 /* 94 -36 */ CWORD_CWORD_CWORD_CWORD,
2824 /* 95 -35 */ CWORD_CWORD_CWORD_CWORD,
2825 /* 96 -34 */ CWORD_CWORD_CWORD_CWORD,
2826 /* 97 -33 */ CWORD_CWORD_CWORD_CWORD,
2827 /* 98 -32 */ CWORD_CWORD_CWORD_CWORD,
2828 /* 99 -31 */ CWORD_CWORD_CWORD_CWORD,
2829 /* 100 -30 */ CWORD_CWORD_CWORD_CWORD,
2830 /* 101 -29 */ CWORD_CWORD_CWORD_CWORD,
2831 /* 102 -28 */ CWORD_CWORD_CWORD_CWORD,
2832 /* 103 -27 */ CWORD_CWORD_CWORD_CWORD,
2833 /* 104 -26 */ CWORD_CWORD_CWORD_CWORD,
2834 /* 105 -25 */ CWORD_CWORD_CWORD_CWORD,
2835 /* 106 -24 */ CWORD_CWORD_CWORD_CWORD,
2836 /* 107 -23 */ CWORD_CWORD_CWORD_CWORD,
2837 /* 108 -22 */ CWORD_CWORD_CWORD_CWORD,
2838 /* 109 -21 */ CWORD_CWORD_CWORD_CWORD,
2839 /* 110 -20 */ CWORD_CWORD_CWORD_CWORD,
2840 /* 111 -19 */ CWORD_CWORD_CWORD_CWORD,
2841 /* 112 -18 */ CWORD_CWORD_CWORD_CWORD,
2842 /* 113 -17 */ CWORD_CWORD_CWORD_CWORD,
2843 /* 114 -16 */ CWORD_CWORD_CWORD_CWORD,
2844 /* 115 -15 */ CWORD_CWORD_CWORD_CWORD,
2845 /* 116 -14 */ CWORD_CWORD_CWORD_CWORD,
2846 /* 117 -13 */ CWORD_CWORD_CWORD_CWORD,
2847 /* 118 -12 */ CWORD_CWORD_CWORD_CWORD,
2848 /* 119 -11 */ CWORD_CWORD_CWORD_CWORD,
2849 /* 120 -10 */ CWORD_CWORD_CWORD_CWORD,
2850 /* 121 -9 */ CWORD_CWORD_CWORD_CWORD,
2851 /* 122 -8 */ CWORD_CWORD_CWORD_CWORD,
2852 /* 123 -7 */ CWORD_CWORD_CWORD_CWORD,
2853 /* 124 -6 */ CWORD_CWORD_CWORD_CWORD,
2854 /* 125 -5 */ CWORD_CWORD_CWORD_CWORD,
2855 /* 126 -4 */ CWORD_CWORD_CWORD_CWORD,
2856 /* 127 -3 */ CWORD_CWORD_CWORD_CWORD,
2857 /* 128 -2 */ CWORD_CWORD_CWORD_CWORD,
2858 /* 129 -1 */ CWORD_CWORD_CWORD_CWORD,
2859 /* 130 0 */ CWORD_CWORD_CWORD_CWORD,
2860 /* 131 1 */ CWORD_CWORD_CWORD_CWORD,
2861 /* 132 2 */ CWORD_CWORD_CWORD_CWORD,
2862 /* 133 3 */ CWORD_CWORD_CWORD_CWORD,
2863 /* 134 4 */ CWORD_CWORD_CWORD_CWORD,
2864 /* 135 5 */ CWORD_CWORD_CWORD_CWORD,
2865 /* 136 6 */ CWORD_CWORD_CWORD_CWORD,
2866 /* 137 7 */ CWORD_CWORD_CWORD_CWORD,
2867 /* 138 8 */ CWORD_CWORD_CWORD_CWORD,
2868 /* 139 9 "\t" */ CSPCL_CWORD_CWORD_CWORD,
2869 /* 140 10 "\n" */ CNL_CNL_CNL_CNL,
2870 /* 141 11 */ CWORD_CWORD_CWORD_CWORD,
2871 /* 142 12 */ CWORD_CWORD_CWORD_CWORD,
2872 /* 143 13 */ CWORD_CWORD_CWORD_CWORD,
2873 /* 144 14 */ CWORD_CWORD_CWORD_CWORD,
2874 /* 145 15 */ CWORD_CWORD_CWORD_CWORD,
2875 /* 146 16 */ CWORD_CWORD_CWORD_CWORD,
2876 /* 147 17 */ CWORD_CWORD_CWORD_CWORD,
2877 /* 148 18 */ CWORD_CWORD_CWORD_CWORD,
2878 /* 149 19 */ CWORD_CWORD_CWORD_CWORD,
2879 /* 150 20 */ CWORD_CWORD_CWORD_CWORD,
2880 /* 151 21 */ CWORD_CWORD_CWORD_CWORD,
2881 /* 152 22 */ CWORD_CWORD_CWORD_CWORD,
2882 /* 153 23 */ CWORD_CWORD_CWORD_CWORD,
2883 /* 154 24 */ CWORD_CWORD_CWORD_CWORD,
2884 /* 155 25 */ CWORD_CWORD_CWORD_CWORD,
2885 /* 156 26 */ CWORD_CWORD_CWORD_CWORD,
2886 /* 157 27 */ CWORD_CWORD_CWORD_CWORD,
2887 /* 158 28 */ CWORD_CWORD_CWORD_CWORD,
2888 /* 159 29 */ CWORD_CWORD_CWORD_CWORD,
2889 /* 160 30 */ CWORD_CWORD_CWORD_CWORD,
2890 /* 161 31 */ CWORD_CWORD_CWORD_CWORD,
2891 /* 162 32 " " */ CSPCL_CWORD_CWORD_CWORD,
2892 /* 163 33 "!" */ CWORD_CCTL_CCTL_CWORD,
2893 /* 164 34 """ */ CDQUOTE_CENDQUOTE_CWORD_CWORD,
2894 /* 165 35 "#" */ CWORD_CWORD_CWORD_CWORD,
2895 /* 166 36 "$" */ CVAR_CVAR_CWORD_CVAR,
2896 /* 167 37 "%" */ CWORD_CWORD_CWORD_CWORD,
2897 /* 168 38 "&" */ CSPCL_CWORD_CWORD_CWORD,
2898 /* 169 39 "'" */ CSQUOTE_CWORD_CENDQUOTE_CWORD,
2899 /* 170 40 "(" */ CSPCL_CWORD_CWORD_CLP,
2900 /* 171 41 ")" */ CSPCL_CWORD_CWORD_CRP,
2901 /* 172 42 "*" */ CWORD_CCTL_CCTL_CWORD,
2902 /* 173 43 "+" */ CWORD_CWORD_CWORD_CWORD,
2903 /* 174 44 "," */ CWORD_CWORD_CWORD_CWORD,
2904 /* 175 45 "-" */ CWORD_CCTL_CCTL_CWORD,
2905 /* 176 46 "." */ CWORD_CWORD_CWORD_CWORD,
2906 /* 177 47 "/" */ CWORD_CCTL_CCTL_CWORD,
2907 /* 178 48 "0" */ CWORD_CWORD_CWORD_CWORD,
2908 /* 179 49 "1" */ CWORD_CWORD_CWORD_CWORD,
2909 /* 180 50 "2" */ CWORD_CWORD_CWORD_CWORD,
2910 /* 181 51 "3" */ CWORD_CWORD_CWORD_CWORD,
2911 /* 182 52 "4" */ CWORD_CWORD_CWORD_CWORD,
2912 /* 183 53 "5" */ CWORD_CWORD_CWORD_CWORD,
2913 /* 184 54 "6" */ CWORD_CWORD_CWORD_CWORD,
2914 /* 185 55 "7" */ CWORD_CWORD_CWORD_CWORD,
2915 /* 186 56 "8" */ CWORD_CWORD_CWORD_CWORD,
2916 /* 187 57 "9" */ CWORD_CWORD_CWORD_CWORD,
2917 /* 188 58 ":" */ CWORD_CCTL_CCTL_CWORD,
2918 /* 189 59 ";" */ CSPCL_CWORD_CWORD_CWORD,
2919 /* 190 60 "<" */ CSPCL_CWORD_CWORD_CWORD,
2920 /* 191 61 "=" */ CWORD_CCTL_CCTL_CWORD,
2921 /* 192 62 ">" */ CSPCL_CWORD_CWORD_CWORD,
2922 /* 193 63 "?" */ CWORD_CCTL_CCTL_CWORD,
2923 /* 194 64 "@" */ CWORD_CWORD_CWORD_CWORD,
2924 /* 195 65 "A" */ CWORD_CWORD_CWORD_CWORD,
2925 /* 196 66 "B" */ CWORD_CWORD_CWORD_CWORD,
2926 /* 197 67 "C" */ CWORD_CWORD_CWORD_CWORD,
2927 /* 198 68 "D" */ CWORD_CWORD_CWORD_CWORD,
2928 /* 199 69 "E" */ CWORD_CWORD_CWORD_CWORD,
2929 /* 200 70 "F" */ CWORD_CWORD_CWORD_CWORD,
2930 /* 201 71 "G" */ CWORD_CWORD_CWORD_CWORD,
2931 /* 202 72 "H" */ CWORD_CWORD_CWORD_CWORD,
2932 /* 203 73 "I" */ CWORD_CWORD_CWORD_CWORD,
2933 /* 204 74 "J" */ CWORD_CWORD_CWORD_CWORD,
2934 /* 205 75 "K" */ CWORD_CWORD_CWORD_CWORD,
2935 /* 206 76 "L" */ CWORD_CWORD_CWORD_CWORD,
2936 /* 207 77 "M" */ CWORD_CWORD_CWORD_CWORD,
2937 /* 208 78 "N" */ CWORD_CWORD_CWORD_CWORD,
2938 /* 209 79 "O" */ CWORD_CWORD_CWORD_CWORD,
2939 /* 210 80 "P" */ CWORD_CWORD_CWORD_CWORD,
2940 /* 211 81 "Q" */ CWORD_CWORD_CWORD_CWORD,
2941 /* 212 82 "R" */ CWORD_CWORD_CWORD_CWORD,
2942 /* 213 83 "S" */ CWORD_CWORD_CWORD_CWORD,
2943 /* 214 84 "T" */ CWORD_CWORD_CWORD_CWORD,
2944 /* 215 85 "U" */ CWORD_CWORD_CWORD_CWORD,
2945 /* 216 86 "V" */ CWORD_CWORD_CWORD_CWORD,
2946 /* 217 87 "W" */ CWORD_CWORD_CWORD_CWORD,
2947 /* 218 88 "X" */ CWORD_CWORD_CWORD_CWORD,
2948 /* 219 89 "Y" */ CWORD_CWORD_CWORD_CWORD,
2949 /* 220 90 "Z" */ CWORD_CWORD_CWORD_CWORD,
2950 /* 221 91 "[" */ CWORD_CCTL_CCTL_CWORD,
2951 /* 222 92 "\" */ CBACK_CBACK_CCTL_CBACK,
2952 /* 223 93 "]" */ CWORD_CCTL_CCTL_CWORD,
2953 /* 224 94 "^" */ CWORD_CWORD_CWORD_CWORD,
2954 /* 225 95 "_" */ CWORD_CWORD_CWORD_CWORD,
2955 /* 226 96 "`" */ CBQUOTE_CBQUOTE_CWORD_CBQUOTE,
2956 /* 227 97 "a" */ CWORD_CWORD_CWORD_CWORD,
2957 /* 228 98 "b" */ CWORD_CWORD_CWORD_CWORD,
2958 /* 229 99 "c" */ CWORD_CWORD_CWORD_CWORD,
2959 /* 230 100 "d" */ CWORD_CWORD_CWORD_CWORD,
2960 /* 231 101 "e" */ CWORD_CWORD_CWORD_CWORD,
2961 /* 232 102 "f" */ CWORD_CWORD_CWORD_CWORD,
2962 /* 233 103 "g" */ CWORD_CWORD_CWORD_CWORD,
2963 /* 234 104 "h" */ CWORD_CWORD_CWORD_CWORD,
2964 /* 235 105 "i" */ CWORD_CWORD_CWORD_CWORD,
2965 /* 236 106 "j" */ CWORD_CWORD_CWORD_CWORD,
2966 /* 237 107 "k" */ CWORD_CWORD_CWORD_CWORD,
2967 /* 238 108 "l" */ CWORD_CWORD_CWORD_CWORD,
2968 /* 239 109 "m" */ CWORD_CWORD_CWORD_CWORD,
2969 /* 240 110 "n" */ CWORD_CWORD_CWORD_CWORD,
2970 /* 241 111 "o" */ CWORD_CWORD_CWORD_CWORD,
2971 /* 242 112 "p" */ CWORD_CWORD_CWORD_CWORD,
2972 /* 243 113 "q" */ CWORD_CWORD_CWORD_CWORD,
2973 /* 244 114 "r" */ CWORD_CWORD_CWORD_CWORD,
2974 /* 245 115 "s" */ CWORD_CWORD_CWORD_CWORD,
2975 /* 246 116 "t" */ CWORD_CWORD_CWORD_CWORD,
2976 /* 247 117 "u" */ CWORD_CWORD_CWORD_CWORD,
2977 /* 248 118 "v" */ CWORD_CWORD_CWORD_CWORD,
2978 /* 249 119 "w" */ CWORD_CWORD_CWORD_CWORD,
2979 /* 250 120 "x" */ CWORD_CWORD_CWORD_CWORD,
2980 /* 251 121 "y" */ CWORD_CWORD_CWORD_CWORD,
2981 /* 252 122 "z" */ CWORD_CWORD_CWORD_CWORD,
2982 /* 253 123 "{" */ CWORD_CWORD_CWORD_CWORD,
2983 /* 254 124 "|" */ CSPCL_CWORD_CWORD_CWORD,
2984 /* 255 125 "}" */ CENDVAR_CENDVAR_CWORD_CENDVAR,
2985 /* 256 126 "~" */ CWORD_CCTL_CCTL_CWORD,
2986 /* 257 127 */ CWORD_CWORD_CWORD_CWORD,
2989 #define SIT(c, syntax) (S_I_T[(int)syntax_index_table[((int)c)+SYNBASE]][syntax])
2991 #endif /* USE_SIT_FUNCTION */
2994 /* ============ Alias handling */
2996 #if ENABLE_ASH_ALIAS
2998 #define ALIASINUSE 1
3009 static struct alias **atab; // [ATABSIZE];
3010 #define INIT_G_alias() do { \
3011 atab = xzalloc(ATABSIZE * sizeof(atab[0])); \
3015 static struct alias **
3016 __lookupalias(const char *name) {
3017 unsigned int hashval;
3024 ch = (unsigned char)*p;
3028 ch = (unsigned char)*++p;
3030 app = &atab[hashval % ATABSIZE];
3032 for (; *app; app = &(*app)->next) {
3033 if (strcmp(name, (*app)->name) == 0) {
3041 static struct alias *
3042 lookupalias(const char *name, int check)
3044 struct alias *ap = *__lookupalias(name);
3046 if (check && ap && (ap->flag & ALIASINUSE))
3051 static struct alias *
3052 freealias(struct alias *ap)
3056 if (ap->flag & ALIASINUSE) {
3057 ap->flag |= ALIASDEAD;
3069 setalias(const char *name, const char *val)
3071 struct alias *ap, **app;
3073 app = __lookupalias(name);
3077 if (!(ap->flag & ALIASINUSE)) {
3080 ap->val = ckstrdup(val);
3081 ap->flag &= ~ALIASDEAD;
3084 ap = ckzalloc(sizeof(struct alias));
3085 ap->name = ckstrdup(name);
3086 ap->val = ckstrdup(val);
3087 /*ap->flag = 0; - ckzalloc did it */
3088 /*ap->next = NULL;*/
3095 unalias(const char *name)
3099 app = __lookupalias(name);
3103 *app = freealias(*app);
3114 struct alias *ap, **app;
3118 for (i = 0; i < ATABSIZE; i++) {
3120 for (ap = *app; ap; ap = *app) {
3121 *app = freealias(*app);
3131 printalias(const struct alias *ap)
3133 out1fmt("%s=%s\n", ap->name, single_quote(ap->val));
3137 * TODO - sort output
3140 aliascmd(int argc UNUSED_PARAM, char **argv)
3149 for (i = 0; i < ATABSIZE; i++) {
3150 for (ap = atab[i]; ap; ap = ap->next) {
3156 while ((n = *++argv) != NULL) {
3157 v = strchr(n+1, '=');
3158 if (v == NULL) { /* n+1: funny ksh stuff */
3159 ap = *__lookupalias(n);
3161 fprintf(stderr, "%s: %s not found\n", "alias", n);
3175 unaliascmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
3179 while ((i = nextopt("a")) != '\0') {
3185 for (i = 0; *argptr; argptr++) {
3186 if (unalias(*argptr)) {
3187 fprintf(stderr, "%s: %s not found\n", "unalias", *argptr);
3195 #endif /* ASH_ALIAS */
3198 /* ============ jobs.c */
3200 /* Mode argument to forkshell. Don't change FORK_FG or FORK_BG. */
3203 #define FORK_NOJOB 2
3205 /* mode flags for showjob(s) */
3206 #define SHOW_PGID 0x01 /* only show pgid - for jobs -p */
3207 #define SHOW_PID 0x04 /* include process pid */
3208 #define SHOW_CHANGED 0x08 /* only jobs whose state has changed */
3211 * A job structure contains information about a job. A job is either a
3212 * single process or a set of processes contained in a pipeline. In the
3213 * latter case, pidlist will be non-NULL, and will point to a -1 terminated
3218 pid_t pid; /* process id */
3219 int status; /* last process status from wait() */
3220 char *cmd; /* text of command being run */
3224 struct procstat ps0; /* status of process */
3225 struct procstat *ps; /* status or processes when more than one */
3227 int stopstatus; /* status of a stopped job */
3230 nprocs: 16, /* number of processes */
3232 #define JOBRUNNING 0 /* at least one proc running */
3233 #define JOBSTOPPED 1 /* all procs are stopped */
3234 #define JOBDONE 2 /* all procs are completed */
3236 sigint: 1, /* job was killed by SIGINT */
3237 jobctl: 1, /* job running under job control */
3239 waited: 1, /* true if this entry has been waited for */
3240 used: 1, /* true if this entry is in used */
3241 changed: 1; /* true if status has changed */
3242 struct job *prev_job; /* previous job */
3245 static struct job *makejob(/*union node *,*/ int);
3247 #define forkshell(job, node, mode) forkshell(job, mode)
3249 static int forkshell(struct job *, union node *, int);
3250 static int waitforjob(struct job *);
3253 enum { doing_jobctl = 0 };
3254 #define setjobctl(on) do {} while (0)
3256 static smallint doing_jobctl; //references:8
3257 static void setjobctl(int);
3261 * Set the signal handler for the specified signal. The routine figures
3262 * out what it should be set to.
3265 setsignal(int signo)
3269 struct sigaction act;
3275 else if (*t != '\0')
3277 if (rootshell && action == S_DFL) {
3280 if (iflag || minusc || sflag == 0)
3303 t = &sigmode[signo - 1];
3307 * current setting unknown
3309 if (sigaction(signo, NULL, &act) == -1) {
3311 * Pretend it worked; maybe we should give a warning
3312 * here, but other shells don't. We don't alter
3313 * sigmode, so that we retry every time.
3317 tsig = S_RESET; /* force to be set */
3318 if (act.sa_handler == SIG_IGN) {
3321 && (signo == SIGTSTP || signo == SIGTTIN || signo == SIGTTOU)
3323 tsig = S_IGN; /* don't hard ignore these */
3327 if (tsig == S_HARD_IGN || tsig == action)
3329 act.sa_handler = SIG_DFL;
3332 act.sa_handler = onsig;
3335 act.sa_handler = SIG_IGN;
3340 sigfillset(&act.sa_mask);
3341 sigaction_set(signo, &act);
3344 /* mode flags for set_curjob */
3345 #define CUR_DELETE 2
3346 #define CUR_RUNNING 1
3347 #define CUR_STOPPED 0
3349 /* mode flags for dowait */
3350 #define DOWAIT_NONBLOCK WNOHANG
3351 #define DOWAIT_BLOCK 0
3354 /* pgrp of shell on invocation */
3355 static int initialpgrp; //references:2
3356 static int ttyfd = -1; //5
3359 static struct job *jobtab; //5
3361 static unsigned njobs; //4
3363 static struct job *curjob; //lots
3364 /* number of presumed living untracked jobs */
3365 static int jobless; //4
3368 set_curjob(struct job *jp, unsigned mode)
3371 struct job **jpp, **curp;
3373 /* first remove from list */
3374 jpp = curp = &curjob;
3379 jpp = &jp1->prev_job;
3381 *jpp = jp1->prev_job;
3383 /* Then re-insert in correct position */
3391 /* job being deleted */
3394 /* newly created job or backgrounded job,
3395 put after all stopped jobs. */
3399 if (!jp1 || jp1->state != JOBSTOPPED)
3402 jpp = &jp1->prev_job;
3408 /* newly stopped job - becomes curjob */
3409 jp->prev_job = *jpp;
3417 jobno(const struct job *jp)
3419 return jp - jobtab + 1;
3424 * Convert a job name to a job structure.
3427 #define getjob(name, getctl) getjob(name)
3430 getjob(const char *name, int getctl)
3434 const char *err_msg = "No such job: %s";
3438 char *(*match)(const char *, const char *);
3453 if (c == '+' || c == '%') {
3455 err_msg = "No current job";
3461 err_msg = "No previous job";
3470 // TODO: number() instead? It does error checking...
3473 jp = jobtab + num - 1;
3490 if (match(jp->ps[0].cmd, p)) {
3494 err_msg = "%s: ambiguous";
3501 err_msg = "job %s not created under job control";
3502 if (getctl && jp->jobctl == 0)
3507 ash_msg_and_raise_error(err_msg, name);
3511 * Mark a job structure as unused.
3514 freejob(struct job *jp)
3516 struct procstat *ps;
3520 for (i = jp->nprocs, ps = jp->ps; --i >= 0; ps++) {
3521 if (ps->cmd != nullstr)
3524 if (jp->ps != &jp->ps0)
3527 set_curjob(jp, CUR_DELETE);
3533 xtcsetpgrp(int fd, pid_t pgrp)
3535 if (tcsetpgrp(fd, pgrp))
3536 ash_msg_and_raise_error("can't set tty process group (%m)");
3540 * Turn job control on and off.
3542 * Note: This code assumes that the third arg to ioctl is a character
3543 * pointer, which is true on Berkeley systems but not System V. Since
3544 * System V doesn't have job control yet, this isn't a problem now.
3546 * Called with interrupts off.
3554 if (on == doing_jobctl || rootshell == 0)
3558 ofd = fd = open(_PATH_TTY, O_RDWR);
3560 /* BTW, bash will try to open(ttyname(0)) if open("/dev/tty") fails.
3561 * That sometimes helps to acquire controlling tty.
3562 * Obviously, a workaround for bugs when someone
3563 * failed to provide a controlling tty to bash! :) */
3569 fd = fcntl(fd, F_DUPFD, 10);
3574 /* fd is a tty at this point */
3575 close_on_exec_on(fd);
3576 do { /* while we are in the background */
3577 pgrp = tcgetpgrp(fd);
3580 ash_msg("can't access tty; job control turned off");
3584 if (pgrp == getpgrp())
3595 xtcsetpgrp(fd, pgrp);
3597 /* turning job control off */
3600 /* was xtcsetpgrp, but this can make exiting ash
3601 * loop forever if pty is already deleted */
3602 tcsetpgrp(fd, pgrp);
3617 killcmd(int argc, char **argv)
3620 if (argv[1] && strcmp(argv[1], "-l") != 0) {
3622 if (argv[i][0] == '%') {
3623 struct job *jp = getjob(argv[i], 0);
3624 unsigned pid = jp->ps[0].pid;
3625 /* Enough space for ' -NNN<nul>' */
3626 argv[i] = alloca(sizeof(int)*3 + 3);
3627 /* kill_main has matching code to expect
3628 * leading space. Needed to not confuse
3629 * negative pids with "kill -SIGNAL_NO" syntax */
3630 sprintf(argv[i], " -%u", pid);
3632 } while (argv[++i]);
3634 return kill_main(argc, argv);
3638 showpipe(struct job *jp, FILE *out)
3640 struct procstat *sp;
3641 struct procstat *spend;
3643 spend = jp->ps + jp->nprocs;
3644 for (sp = jp->ps + 1; sp < spend; sp++)
3645 fprintf(out, " | %s", sp->cmd);
3646 outcslow('\n', out);
3647 flush_stdout_stderr();
3652 restartjob(struct job *jp, int mode)
3654 struct procstat *ps;
3660 if (jp->state == JOBDONE)
3662 jp->state = JOBRUNNING;
3664 if (mode == FORK_FG)
3665 xtcsetpgrp(ttyfd, pgid);
3666 killpg(pgid, SIGCONT);
3670 if (WIFSTOPPED(ps->status)) {
3676 status = (mode == FORK_FG) ? waitforjob(jp) : 0;
3682 fg_bgcmd(int argc UNUSED_PARAM, char **argv)
3689 mode = (**argv == 'f') ? FORK_FG : FORK_BG;
3694 jp = getjob(*argv, 1);
3695 if (mode == FORK_BG) {
3696 set_curjob(jp, CUR_RUNNING);
3697 fprintf(out, "[%d] ", jobno(jp));
3699 outstr(jp->ps->cmd, out);
3701 retval = restartjob(jp, mode);
3702 } while (*argv && *++argv);
3708 sprint_status(char *s, int status, int sigonly)
3714 if (!WIFEXITED(status)) {
3716 if (WIFSTOPPED(status))
3717 st = WSTOPSIG(status);
3720 st = WTERMSIG(status);
3722 if (st == SIGINT || st == SIGPIPE)
3725 if (WIFSTOPPED(status))
3730 col = fmtstr(s, 32, strsignal(st));
3731 if (WCOREDUMP(status)) {
3732 col += fmtstr(s + col, 16, " (core dumped)");
3734 } else if (!sigonly) {
3735 st = WEXITSTATUS(status);
3737 col = fmtstr(s, 16, "Done(%d)", st);
3739 col = fmtstr(s, 16, "Done");
3746 * Do a wait system call. If job control is compiled in, we accept
3747 * stopped processes. If block is zero, we return a value of zero
3748 * rather than blocking.
3750 * System V doesn't have a non-blocking wait system call. It does
3751 * have a SIGCLD signal that is sent to a process when one of it's
3752 * children dies. The obvious way to use SIGCLD would be to install
3753 * a handler for SIGCLD which simply bumped a counter when a SIGCLD
3754 * was received, and have waitproc bump another counter when it got
3755 * the status of a process. Waitproc would then know that a wait
3756 * system call would not block if the two counters were different.
3757 * This approach doesn't work because if a process has children that
3758 * have not been waited for, System V will send it a SIGCLD when it
3759 * installs a signal handler for SIGCLD. What this means is that when
3760 * a child exits, the shell will be sent SIGCLD signals continuously
3761 * until is runs out of stack space, unless it does a wait call before
3762 * restoring the signal handler. The code below takes advantage of
3763 * this (mis)feature by installing a signal handler for SIGCLD and
3764 * then checking to see whether it was called. If there are any
3765 * children to be waited for, it will be.
3767 * If neither SYSV nor BSD is defined, we don't implement nonblocking
3768 * waits at all. In this case, the user will not be informed when
3769 * a background process until the next time she runs a real program
3770 * (as opposed to running a builtin command or just typing return),
3771 * and the jobs command may give out of date information.
3774 waitproc(int wait_flags, int *status)
3778 wait_flags |= WUNTRACED;
3780 /* NB: _not_ safe_waitpid, we need to detect EINTR */
3781 return waitpid(-1, status, wait_flags);
3785 * Wait for a process to terminate.
3788 dowait(int wait_flags, struct job *job)
3793 struct job *thisjob;
3796 TRACE(("dowait(%d) called\n", wait_flags));
3797 pid = waitproc(wait_flags, &status);
3798 TRACE(("wait returns pid=%d, status=%d\n", pid, status));
3800 /* If we were doing blocking wait and (probably) got EINTR,
3801 * check for pending sigs received while waiting.
3802 * (NB: can be moved into callers if needed) */
3803 if (wait_flags == DOWAIT_BLOCK && pendingsig)
3804 raise_exception(EXSIG);
3809 for (jp = curjob; jp; jp = jp->prev_job) {
3810 struct procstat *sp;
3811 struct procstat *spend;
3812 if (jp->state == JOBDONE)
3815 spend = jp->ps + jp->nprocs;
3818 if (sp->pid == pid) {
3819 TRACE(("Job %d: changing status of proc %d "
3820 "from 0x%x to 0x%x\n",
3821 jobno(jp), pid, sp->status, status));
3822 sp->status = status;
3825 if (sp->status == -1)
3828 if (state == JOBRUNNING)
3830 if (WIFSTOPPED(sp->status)) {
3831 jp->stopstatus = sp->status;
3835 } while (++sp < spend);
3840 if (!WIFSTOPPED(status))
3846 if (state != JOBRUNNING) {
3847 thisjob->changed = 1;
3849 if (thisjob->state != state) {
3850 TRACE(("Job %d: changing state from %d to %d\n",
3851 jobno(thisjob), thisjob->state, state));
3852 thisjob->state = state;
3854 if (state == JOBSTOPPED) {
3855 set_curjob(thisjob, CUR_STOPPED);
3864 if (thisjob && thisjob == job) {
3868 len = sprint_status(s, status, 1);
3880 showjob(FILE *out, struct job *jp, int mode)
3882 struct procstat *ps;
3883 struct procstat *psend;
3890 if (mode & SHOW_PGID) {
3891 /* just output process (group) id of pipeline */
3892 fprintf(out, "%d\n", ps->pid);
3896 col = fmtstr(s, 16, "[%d] ", jobno(jp));
3901 else if (curjob && jp == curjob->prev_job)
3904 if (mode & SHOW_PID)
3905 col += fmtstr(s + col, 16, "%d ", ps->pid);
3907 psend = ps + jp->nprocs;
3909 if (jp->state == JOBRUNNING) {
3910 strcpy(s + col, "Running");
3911 col += sizeof("Running") - 1;
3913 int status = psend[-1].status;
3914 if (jp->state == JOBSTOPPED)
3915 status = jp->stopstatus;
3916 col += sprint_status(s + col, status, 0);
3922 /* for each process */
3923 col = fmtstr(s, 48, " |\n%*c%d ", indent_col, ' ', ps->pid) - 3;
3925 fprintf(out, "%s%*c%s",
3926 s, 33 - col >= 0 ? 33 - col : 0, ' ', ps->cmd
3928 if (!(mode & SHOW_PID)) {
3932 if (++ps == psend) {
3933 outcslow('\n', out);
3940 if (jp->state == JOBDONE) {
3941 TRACE(("showjob: freeing job %d\n", jobno(jp)));
3947 * Print a list of jobs. If "change" is nonzero, only print jobs whose
3948 * statuses have changed since the last call to showjobs.
3951 showjobs(FILE *out, int mode)
3955 TRACE(("showjobs(%x) called\n", mode));
3957 /* If not even one job changed, there is nothing to do */
3958 while (dowait(DOWAIT_NONBLOCK, NULL) > 0)
3961 for (jp = curjob; jp; jp = jp->prev_job) {
3962 if (!(mode & SHOW_CHANGED) || jp->changed) {
3963 showjob(out, jp, mode);
3969 jobscmd(int argc UNUSED_PARAM, char **argv)
3974 while ((m = nextopt("lp"))) {
3984 showjob(stdout, getjob(*argv,0), mode);
3987 showjobs(stdout, mode);
3994 getstatus(struct job *job)
3999 status = job->ps[job->nprocs - 1].status;
4000 retval = WEXITSTATUS(status);
4001 if (!WIFEXITED(status)) {
4003 retval = WSTOPSIG(status);
4004 if (!WIFSTOPPED(status))
4007 /* XXX: limits number of signals */
4008 retval = WTERMSIG(status);
4010 if (retval == SIGINT)
4016 TRACE(("getstatus: job %d, nproc %d, status %x, retval %x\n",
4017 jobno(job), job->nprocs, status, retval));
4022 waitcmd(int argc UNUSED_PARAM, char **argv)
4031 raise_exception(EXSIG);
4038 /* wait for all jobs */
4042 if (!jp) /* no running procs */
4044 if (jp->state == JOBRUNNING)
4049 dowait(DOWAIT_BLOCK, NULL);
4055 if (**argv != '%') {
4056 pid_t pid = number(*argv);
4061 if (job->ps[job->nprocs - 1].pid == pid)
4063 job = job->prev_job;
4066 job = getjob(*argv, 0);
4067 /* loop until process terminated or stopped */
4068 while (job->state == JOBRUNNING)
4069 dowait(DOWAIT_BLOCK, NULL);
4071 retval = getstatus(job);
4085 struct job *jp, *jq;
4087 len = njobs * sizeof(*jp);
4089 jp = ckrealloc(jq, len + 4 * sizeof(*jp));
4091 offset = (char *)jp - (char *)jq;
4093 /* Relocate pointers */
4096 jq = (struct job *)((char *)jq + l);
4100 #define joff(p) ((struct job *)((char *)(p) + l))
4101 #define jmove(p) (p) = (void *)((char *)(p) + offset)
4102 if (joff(jp)->ps == &jq->ps0)
4103 jmove(joff(jp)->ps);
4104 if (joff(jp)->prev_job)
4105 jmove(joff(jp)->prev_job);
4115 jp = (struct job *)((char *)jp + len);
4119 } while (--jq >= jp);
4124 * Return a new job structure.
4125 * Called with interrupts off.
4128 makejob(/*union node *node,*/ int nprocs)
4133 for (i = njobs, jp = jobtab; ; jp++) {
4140 if (jp->state != JOBDONE || !jp->waited)
4149 memset(jp, 0, sizeof(*jp));
4151 /* jp->jobctl is a bitfield.
4152 * "jp->jobctl |= jobctl" likely to give awful code */
4156 jp->prev_job = curjob;
4161 jp->ps = ckmalloc(nprocs * sizeof(struct procstat));
4163 TRACE(("makejob(%d) returns %%%d\n", nprocs,
4170 * Return a string identifying a command (to be printed by the
4173 static char *cmdnextc;
4176 cmdputs(const char *s)
4178 static const char vstype[VSTYPE + 1][3] = {
4179 "", "}", "-", "+", "?", "=",
4180 "%", "%%", "#", "##"
4181 USE_ASH_BASH_COMPAT(, ":", "/", "//")
4184 const char *p, *str;
4185 char c, cc[2] = " ";
4190 nextc = makestrspace((strlen(s) + 1) * 8, cmdnextc);
4192 while ((c = *p++) != 0) {
4200 if ((subtype & VSTYPE) == VSLENGTH)
4204 if (!(subtype & VSQUOTE) == !(quoted & 1))
4210 str = "\"}" + !(quoted & 1);
4217 case CTLBACKQ+CTLQUOTE:
4220 #if ENABLE_ASH_MATH_SUPPORT
4235 if ((subtype & VSTYPE) != VSNORMAL)
4237 str = vstype[subtype & VSTYPE];
4238 if (subtype & VSNUL)
4247 /* These can only happen inside quotes */
4260 while ((c = *str++)) {
4265 USTPUTC('"', nextc);
4271 /* cmdtxt() and cmdlist() call each other */
4272 static void cmdtxt(union node *n);
4275 cmdlist(union node *np, int sep)
4277 for (; np; np = np->narg.next) {
4281 if (sep && np->narg.next)
4287 cmdtxt(union node *n)
4290 struct nodelist *lp;
4301 lp = n->npipe.cmdlist;
4319 cmdtxt(n->nbinary.ch1);
4335 cmdtxt(n->nif.test);
4338 if (n->nif.elsepart) {
4341 n = n->nif.elsepart;
4357 cmdtxt(n->nbinary.ch1);
4367 cmdputs(n->nfor.var);
4369 cmdlist(n->nfor.args, 1);
4374 cmdputs(n->narg.text);
4378 cmdlist(n->ncmd.args, 1);
4379 cmdlist(n->ncmd.redirect, 0);
4392 cmdputs(n->ncase.expr->narg.text);
4394 for (np = n->ncase.cases; np; np = np->nclist.next) {
4395 cmdtxt(np->nclist.pattern);
4397 cmdtxt(np->nclist.body);
4423 cmdputs(utoa(n->nfile.fd));
4425 if (n->type == NTOFD || n->type == NFROMFD) {
4426 cmdputs(utoa(n->ndup.dupfd));
4435 commandtext(union node *n)
4439 STARTSTACKSTR(cmdnextc);
4441 name = stackblock();
4442 TRACE(("commandtext: name %p, end %p\n\t\"%s\"\n",
4443 name, cmdnextc, cmdnextc));
4444 return ckstrdup(name);
4449 * Fork off a subshell. If we are doing job control, give the subshell its
4450 * own process group. Jp is a job structure that the job is to be added to.
4451 * N is the command that will be evaluated by the child. Both jp and n may
4452 * be NULL. The mode parameter can be one of the following:
4453 * FORK_FG - Fork off a foreground process.
4454 * FORK_BG - Fork off a background process.
4455 * FORK_NOJOB - Like FORK_FG, but don't give the process its own
4456 * process group even if job control is on.
4458 * When job control is turned off, background processes have their standard
4459 * input redirected to /dev/null (except for the second and later processes
4462 * Called with interrupts off.
4465 * Clear traps on a fork.
4472 for (tp = trap; tp < &trap[NSIG]; tp++) {
4473 if (*tp && **tp) { /* trap not NULL or "" (SIG_IGN) */
4478 setsignal(tp - trap);
4484 /* Lives far away from here, needed for forkchild */
4485 static void closescript(void);
4487 /* Called after fork(), in child */
4489 forkchild(struct job *jp, /*union node *n,*/ int mode)
4493 TRACE(("Child shell %d\n", getpid()));
4500 /* do job control only in root shell */
4502 if (mode != FORK_NOJOB && jp->jobctl && !oldlvl) {
4505 if (jp->nprocs == 0)
4508 pgrp = jp->ps[0].pid;
4509 /* This can fail because we are doing it in the parent also */
4510 (void)setpgid(0, pgrp);
4511 if (mode == FORK_FG)
4512 xtcsetpgrp(ttyfd, pgrp);
4517 if (mode == FORK_BG) {
4520 if (jp->nprocs == 0) {
4522 if (open(bb_dev_null, O_RDONLY) != 0)
4523 ash_msg_and_raise_error("can't open %s", bb_dev_null);
4526 if (!oldlvl && iflag) {
4531 for (jp = curjob; jp; jp = jp->prev_job)
4536 /* Called after fork(), in parent */
4538 #define forkparent(jp, n, mode, pid) forkparent(jp, mode, pid)
4541 forkparent(struct job *jp, union node *n, int mode, pid_t pid)
4543 TRACE(("In parent shell: child = %d\n", pid));
4545 while (jobless && dowait(DOWAIT_NONBLOCK, NULL) > 0)
4551 if (mode != FORK_NOJOB && jp->jobctl) {
4554 if (jp->nprocs == 0)
4557 pgrp = jp->ps[0].pid;
4558 /* This can fail because we are doing it in the child also */
4562 if (mode == FORK_BG) {
4563 backgndpid = pid; /* set $! */
4564 set_curjob(jp, CUR_RUNNING);
4567 struct procstat *ps = &jp->ps[jp->nprocs++];
4572 if (doing_jobctl && n)
4573 ps->cmd = commandtext(n);
4579 forkshell(struct job *jp, union node *n, int mode)
4583 TRACE(("forkshell(%%%d, %p, %d) called\n", jobno(jp), n, mode));
4586 TRACE(("Fork failed, errno=%d", errno));
4589 ash_msg_and_raise_error("can't fork");
4592 forkchild(jp, /*n,*/ mode);
4594 forkparent(jp, n, mode, pid);
4599 * Wait for job to finish.
4601 * Under job control we have the problem that while a child process is
4602 * running interrupts generated by the user are sent to the child but not
4603 * to the shell. This means that an infinite loop started by an inter-
4604 * active user may be hard to kill. With job control turned off, an
4605 * interactive user may place an interactive program inside a loop. If
4606 * the interactive program catches interrupts, the user doesn't want
4607 * these interrupts to also abort the loop. The approach we take here
4608 * is to have the shell ignore interrupt signals while waiting for a
4609 * foreground process to terminate, and then send itself an interrupt
4610 * signal if the child process was terminated by an interrupt signal.
4611 * Unfortunately, some programs want to do a bit of cleanup and then
4612 * exit on interrupt; unless these processes terminate themselves by
4613 * sending a signal to themselves (instead of calling exit) they will
4614 * confuse this approach.
4616 * Called with interrupts off.
4619 waitforjob(struct job *jp)
4623 TRACE(("waitforjob(%%%d) called\n", jobno(jp)));
4624 while (jp->state == JOBRUNNING) {
4625 dowait(DOWAIT_BLOCK, jp);
4630 xtcsetpgrp(ttyfd, rootpid);
4632 * This is truly gross.
4633 * If we're doing job control, then we did a TIOCSPGRP which
4634 * caused us (the shell) to no longer be in the controlling
4635 * session -- so we wouldn't have seen any ^C/SIGINT. So, we
4636 * intuit from the subprocess exit status whether a SIGINT
4637 * occurred, and if so interrupt ourselves. Yuck. - mycroft
4639 if (jp->sigint) /* TODO: do the same with all signals */
4640 raise(SIGINT); /* ... by raise(jp->sig) instead? */
4642 if (jp->state == JOBDONE)
4649 * return 1 if there are stopped jobs, otherwise 0
4661 if (jp && jp->state == JOBSTOPPED) {
4662 out2str("You have stopped jobs.\n");
4671 /* ============ redir.c
4673 * Code for dealing with input/output redirection.
4676 #define EMPTY -2 /* marks an unused slot in redirtab */
4677 #define CLOSED -3 /* marks a slot of previously-closed fd */
4680 * Open a file in noclobber mode.
4681 * The code was copied from bash.
4684 noclobberopen(const char *fname)
4687 struct stat finfo, finfo2;
4690 * If the file exists and is a regular file, return an error
4693 r = stat(fname, &finfo);
4694 if (r == 0 && S_ISREG(finfo.st_mode)) {
4700 * If the file was not present (r != 0), make sure we open it
4701 * exclusively so that if it is created before we open it, our open
4702 * will fail. Make sure that we do not truncate an existing file.
4703 * Note that we don't turn on O_EXCL unless the stat failed -- if the
4704 * file was not a regular file, we leave O_EXCL off.
4707 return open(fname, O_WRONLY|O_CREAT|O_EXCL, 0666);
4708 fd = open(fname, O_WRONLY|O_CREAT, 0666);
4710 /* If the open failed, return the file descriptor right away. */
4715 * OK, the open succeeded, but the file may have been changed from a
4716 * non-regular file to a regular file between the stat and the open.
4717 * We are assuming that the O_EXCL open handles the case where FILENAME
4718 * did not exist and is symlinked to an existing file between the stat
4723 * If we can open it and fstat the file descriptor, and neither check
4724 * revealed that it was a regular file, and the file has not been
4725 * replaced, return the file descriptor.
4727 if (fstat(fd, &finfo2) == 0 && !S_ISREG(finfo2.st_mode)
4728 && finfo.st_dev == finfo2.st_dev && finfo.st_ino == finfo2.st_ino)
4731 /* The file has been replaced. badness. */
4738 * Handle here documents. Normally we fork off a process to write the
4739 * data to a pipe. If the document is short, we can stuff the data in
4740 * the pipe without forking.
4742 /* openhere needs this forward reference */
4743 static void expandhere(union node *arg, int fd);
4745 openhere(union node *redir)
4751 ash_msg_and_raise_error("pipe call failed");
4752 if (redir->type == NHERE) {
4753 len = strlen(redir->nhere.doc->narg.text);
4754 if (len <= PIPE_BUF) {
4755 full_write(pip[1], redir->nhere.doc->narg.text, len);
4759 if (forkshell((struct job *)NULL, (union node *)NULL, FORK_NOJOB) == 0) {
4762 signal(SIGINT, SIG_IGN);
4763 signal(SIGQUIT, SIG_IGN);
4764 signal(SIGHUP, SIG_IGN);
4766 signal(SIGTSTP, SIG_IGN);
4768 signal(SIGPIPE, SIG_DFL);
4769 if (redir->type == NHERE)
4770 full_write(pip[1], redir->nhere.doc->narg.text, len);
4772 expandhere(redir->nhere.doc, pip[1]);
4773 _exit(EXIT_SUCCESS);
4781 openredirect(union node *redir)
4786 switch (redir->nfile.type) {
4788 fname = redir->nfile.expfname;
4789 f = open(fname, O_RDONLY);
4794 fname = redir->nfile.expfname;
4795 f = open(fname, O_RDWR|O_CREAT|O_TRUNC, 0666);
4800 /* Take care of noclobber mode. */
4802 fname = redir->nfile.expfname;
4803 f = noclobberopen(fname);
4810 fname = redir->nfile.expfname;
4811 f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666);
4816 fname = redir->nfile.expfname;
4817 f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666);
4825 /* Fall through to eliminate warning. */
4826 /* Our single caller does this itself */
4833 f = openhere(redir);
4839 ash_msg_and_raise_error("can't create %s: %s", fname, errmsg(errno, "nonexistent directory"));
4841 ash_msg_and_raise_error("can't open %s: %s", fname, errmsg(errno, "no such file"));
4845 * Copy a file descriptor to be >= to. Returns -1
4846 * if the source file descriptor is closed, EMPTY if there are no unused
4847 * file descriptors left.
4850 copyfd(int from, int to)
4854 newfd = fcntl(from, F_DUPFD, to);
4856 if (errno == EMFILE)
4858 /* Happens when source fd is not open: try "echo >&99" */
4859 ash_msg_and_raise_error("%d: %m", from);
4864 /* Struct def and variable are moved down to the first usage site */
4869 struct redirtab *next;
4872 struct two_fd_t two_fd[0];
4874 #define redirlist (G_var.redirlist)
4876 static int need_to_remember(struct redirtab *rp, int fd)
4880 if (!rp) /* remebering was not requested */
4883 for (i = 0; i < rp->pair_count; i++) {
4884 if (rp->two_fd[i].orig == fd) {
4885 /* already remembered */
4893 * Process a list of redirection commands. If the REDIR_PUSH flag is set,
4894 * old file descriptors are stashed away so that the redirection can be
4895 * undone by calling popredir. If the REDIR_BACKQ flag is set, then the
4896 * standard output, and the standard error if it becomes a duplicate of
4897 * stdout, is saved in memory.
4899 /* flags passed to redirect */
4900 #define REDIR_PUSH 01 /* save previous values of file descriptors */
4901 #define REDIR_SAVEFD2 03 /* set preverrout */
4903 redirect(union node *redir, int flags)
4905 struct redirtab *sv;
4910 int copied_fd2 = -1;
4920 if (flags & REDIR_PUSH) {
4921 union node *tmp = redir;
4924 tmp = tmp->nfile.next;
4926 sv = ckmalloc(sizeof(*sv) + sv_pos * sizeof(sv->two_fd[0]));
4927 sv->next = redirlist;
4928 sv->pair_count = sv_pos;
4930 sv->nullredirs = g_nullredirs - 1;
4932 while (sv_pos > 0) {
4934 sv->two_fd[sv_pos].orig = sv->two_fd[sv_pos].copy = EMPTY;
4939 fd = redir->nfile.fd;
4940 if (redir->nfile.type == NTOFD || redir->nfile.type == NFROMFD) {
4941 if (redir->ndup.dupfd == fd)
4942 continue; /* redirect from/to same file descriptor */
4945 newfd = openredirect(redir); /* always >= 0 */
4947 /* Descriptor wasn't open before redirect.
4948 * Mark it for close in the future */
4949 if (need_to_remember(sv, fd)) {
4951 copied_fd2 = CLOSED; /// do we need this?
4952 sv->two_fd[sv_pos].orig = fd;
4953 sv->two_fd[sv_pos].copy = CLOSED;
4959 if (need_to_remember(sv, fd)) {
4960 /* Copy old descriptor */
4961 i = fcntl(fd, F_DUPFD, 10);
4965 /* Strange error (e.g. "too many files" EMFILE?) */
4969 ash_msg_and_raise_error("%d: %m", fd);
4972 /* EBADF: it is not open - ok */
4974 /* fd is open, save its copy */
4975 /* You'd expect copy to be CLOEXECed. Currently these extra "saved" fds
4976 * are closed in popredir() in the child, preventing them from leaking
4977 * into child. (popredir() also cleans up the mess in case of failures)
4981 sv->two_fd[sv_pos].orig = fd;
4982 sv->two_fd[sv_pos].copy = i;
4989 /* At this point fd is closed */
4991 /* NTOFD/NFROMFD: copy redir->ndup.dupfd to fd */
4992 if (redir->ndup.dupfd >= 0) { /* if not ">&-" */
4993 copyfd(redir->ndup.dupfd, fd);
4995 } else { /* move newfd to fd */
4999 } while ((redir = redir->nfile.next) != NULL);
5002 if ((flags & REDIR_SAVEFD2) && copied_fd2 >= 0)
5003 preverrout_fd = copied_fd2;
5007 * Undo the effects of the last redirection.
5012 struct redirtab *rp;
5015 if (--g_nullredirs >= 0)
5019 for (i = 0; i < rp->pair_count; i++) {
5020 int fd = rp->two_fd[i].orig;
5021 if (rp->two_fd[i].copy == CLOSED) {
5026 if (rp->two_fd[i].copy != EMPTY) {
5029 copyfd(rp->two_fd[i].copy, fd);
5031 close(rp->two_fd[i].copy);
5034 redirlist = rp->next;
5035 g_nullredirs = rp->nullredirs;
5041 * Undo all redirections. Called on error or interrupt.
5045 * Discard all saved file descriptors.
5048 clearredir(int drop)
5059 redirectsafe(union node *redir, int flags)
5062 volatile int saveint;
5063 struct jmploc *volatile savehandler = exception_handler;
5064 struct jmploc jmploc;
5067 err = setjmp(jmploc.loc) * 2;
5069 exception_handler = &jmploc;
5070 redirect(redir, flags);
5072 exception_handler = savehandler;
5073 if (err && exception != EXERROR)
5074 longjmp(exception_handler->loc, 1);
5075 RESTORE_INT(saveint);
5080 /* ============ Routines to expand arguments to commands
5082 * We have to deal with backquotes, shell variables, and file metacharacters.
5085 #if ENABLE_ASH_MATH_SUPPORT_64
5086 typedef int64_t arith_t;
5087 #define arith_t_type long long
5089 typedef long arith_t;
5090 #define arith_t_type long
5093 #if ENABLE_ASH_MATH_SUPPORT
5094 static arith_t dash_arith(const char *);
5095 static arith_t arith(const char *expr, int *perrcode);
5101 #define EXP_FULL 0x1 /* perform word splitting & file globbing */
5102 #define EXP_TILDE 0x2 /* do normal tilde expansion */
5103 #define EXP_VARTILDE 0x4 /* expand tildes in an assignment */
5104 #define EXP_REDIR 0x8 /* file glob for a redirection (1 match only) */
5105 #define EXP_CASE 0x10 /* keeps quotes around for CASE pattern */
5106 #define EXP_RECORD 0x20 /* need to record arguments for ifs breakup */
5107 #define EXP_VARTILDE2 0x40 /* expand tildes after colons only */
5108 #define EXP_WORD 0x80 /* expand word in parameter expansion */
5109 #define EXP_QWORD 0x100 /* expand word in quoted parameter expansion */
5113 #define RMESCAPE_ALLOC 0x1 /* Allocate a new string */
5114 #define RMESCAPE_GLOB 0x2 /* Add backslashes for glob */
5115 #define RMESCAPE_QUOTED 0x4 /* Remove CTLESC unless in quotes */
5116 #define RMESCAPE_GROW 0x8 /* Grow strings instead of stalloc */
5117 #define RMESCAPE_HEAP 0x10 /* Malloc strings instead of stalloc */
5120 * Structure specifying which parts of the string should be searched
5121 * for IFS characters.
5124 struct ifsregion *next; /* next region in list */
5125 int begoff; /* offset of start of region */
5126 int endoff; /* offset of end of region */
5127 int nulonly; /* search for nul bytes only */
5131 struct strlist *list;
5132 struct strlist **lastp;
5135 /* output of current string */
5136 static char *expdest;
5137 /* list of back quote expressions */
5138 static struct nodelist *argbackq;
5139 /* first struct in list of ifs regions */
5140 static struct ifsregion ifsfirst;
5141 /* last struct in list */
5142 static struct ifsregion *ifslastp;
5143 /* holds expanded arg list */
5144 static struct arglist exparg;
5154 expdest = makestrspace(32, expdest);
5155 #if ENABLE_ASH_MATH_SUPPORT_64
5156 len = fmtstr(expdest, 32, "%lld", (long long) num);
5158 len = fmtstr(expdest, 32, "%ld", num);
5160 STADJUST(len, expdest);
5165 esclen(const char *start, const char *p)
5169 while (p > start && *--p == CTLESC) {
5176 * Remove any CTLESC characters from a string.
5179 _rmescapes(char *str, int flag)
5181 static const char qchars[] ALIGN1 = { CTLESC, CTLQUOTEMARK, '\0' };
5188 p = strpbrk(str, qchars);
5194 if (flag & RMESCAPE_ALLOC) {
5195 size_t len = p - str;
5196 size_t fulllen = len + strlen(p) + 1;
5198 if (flag & RMESCAPE_GROW) {
5199 r = makestrspace(fulllen, expdest);
5200 } else if (flag & RMESCAPE_HEAP) {
5201 r = ckmalloc(fulllen);
5203 r = stalloc(fulllen);
5207 q = (char *)memcpy(q, str, len) + len;
5210 inquotes = (flag & RMESCAPE_QUOTED) ^ RMESCAPE_QUOTED;
5211 globbing = flag & RMESCAPE_GLOB;
5212 notescaped = globbing;
5214 if (*p == CTLQUOTEMARK) {
5215 inquotes = ~inquotes;
5217 notescaped = globbing;
5221 /* naked back slash */
5227 if (notescaped && inquotes && *p != '/') {
5231 notescaped = globbing;
5236 if (flag & RMESCAPE_GROW) {
5238 STADJUST(q - r + 1, expdest);
5242 #define rmescapes(p) _rmescapes((p), 0)
5244 #define pmatch(a, b) !fnmatch((a), (b), 0)
5247 * Prepare a pattern for a expmeta (internal glob(3)) call.
5249 * Returns an stalloced string.
5252 preglob(const char *pattern, int quoted, int flag)
5254 flag |= RMESCAPE_GLOB;
5256 flag |= RMESCAPE_QUOTED;
5258 return _rmescapes((char *)pattern, flag);
5262 * Put a string on the stack.
5265 memtodest(const char *p, size_t len, int syntax, int quotes)
5269 q = makestrspace(len * 2, q);
5272 int c = signed_char2int(*p++);
5275 if (quotes && (SIT(c, syntax) == CCTL || SIT(c, syntax) == CBACK))
5284 strtodest(const char *p, int syntax, int quotes)
5286 memtodest(p, strlen(p), syntax, quotes);
5290 * Record the fact that we have to scan this region of the
5291 * string for IFS characters.
5294 recordregion(int start, int end, int nulonly)
5296 struct ifsregion *ifsp;
5298 if (ifslastp == NULL) {
5302 ifsp = ckzalloc(sizeof(*ifsp));
5303 /*ifsp->next = NULL; - ckzalloc did it */
5304 ifslastp->next = ifsp;
5308 ifslastp->begoff = start;
5309 ifslastp->endoff = end;
5310 ifslastp->nulonly = nulonly;
5314 removerecordregions(int endoff)
5316 if (ifslastp == NULL)
5319 if (ifsfirst.endoff > endoff) {
5320 while (ifsfirst.next != NULL) {
5321 struct ifsregion *ifsp;
5323 ifsp = ifsfirst.next->next;
5324 free(ifsfirst.next);
5325 ifsfirst.next = ifsp;
5328 if (ifsfirst.begoff > endoff)
5331 ifslastp = &ifsfirst;
5332 ifsfirst.endoff = endoff;
5337 ifslastp = &ifsfirst;
5338 while (ifslastp->next && ifslastp->next->begoff < endoff)
5339 ifslastp=ifslastp->next;
5340 while (ifslastp->next != NULL) {
5341 struct ifsregion *ifsp;
5343 ifsp = ifslastp->next->next;
5344 free(ifslastp->next);
5345 ifslastp->next = ifsp;
5348 if (ifslastp->endoff > endoff)
5349 ifslastp->endoff = endoff;
5353 exptilde(char *startp, char *p, int flag)
5359 int quotes = flag & (EXP_FULL | EXP_CASE);
5364 while ((c = *++p) != '\0') {
5371 if (flag & EXP_VARTILDE)
5381 if (*name == '\0') {
5382 home = lookupvar(homestr);
5384 pw = getpwnam(name);
5389 if (!home || !*home)
5392 startloc = expdest - (char *)stackblock();
5393 strtodest(home, SQSYNTAX, quotes);
5394 recordregion(startloc, expdest - (char *)stackblock(), 0);
5402 * Execute a command inside back quotes. If it's a builtin command, we
5403 * want to save its output in a block obtained from malloc. Otherwise
5404 * we fork off a subprocess and get the output of the command via a pipe.
5405 * Should be called with interrupts off.
5407 struct backcmd { /* result of evalbackcmd */
5408 int fd; /* file descriptor to read from */
5409 int nleft; /* number of chars in buffer */
5410 char *buf; /* buffer */
5411 struct job *jp; /* job structure for command */
5414 /* These forward decls are needed to use "eval" code for backticks handling: */
5415 static uint8_t back_exitstatus; /* exit status of backquoted command */
5416 #define EV_EXIT 01 /* exit after evaluating tree */
5417 static void evaltree(union node *, int);
5420 evalbackcmd(union node *n, struct backcmd *result)
5432 saveherefd = herefd;
5440 ash_msg_and_raise_error("pipe call failed");
5441 jp = makejob(/*n,*/ 1);
5442 if (forkshell(jp, n, FORK_NOJOB) == 0) {
5451 evaltree(n, EV_EXIT); /* actually evaltreenr... */
5455 result->fd = pip[0];
5458 herefd = saveherefd;
5460 TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n",
5461 result->fd, result->buf, result->nleft, result->jp));
5465 * Expand stuff in backwards quotes.
5468 expbackq(union node *cmd, int quoted, int quotes)
5476 int syntax = quoted ? DQSYNTAX : BASESYNTAX;
5477 struct stackmark smark;
5480 setstackmark(&smark);
5482 startloc = dest - (char *)stackblock();
5484 evalbackcmd(cmd, &in);
5485 popstackmark(&smark);
5492 memtodest(p, i, syntax, quotes);
5496 i = nonblock_safe_read(in.fd, buf, sizeof(buf));
5497 TRACE(("expbackq: read returns %d\n", i));
5506 back_exitstatus = waitforjob(in.jp);
5510 /* Eat all trailing newlines */
5512 for (; dest > (char *)stackblock() && dest[-1] == '\n';)
5517 recordregion(startloc, dest - (char *)stackblock(), 0);
5518 TRACE(("evalbackq: size=%d: \"%.*s\"\n",
5519 (dest - (char *)stackblock()) - startloc,
5520 (dest - (char *)stackblock()) - startloc,
5521 stackblock() + startloc));
5524 #if ENABLE_ASH_MATH_SUPPORT
5526 * Expand arithmetic expression. Backup to start of expression,
5527 * evaluate, place result in (backed up) result, adjust string position.
5540 * This routine is slightly over-complicated for
5541 * efficiency. Next we scan backwards looking for the
5542 * start of arithmetic.
5544 start = stackblock();
5551 while (*p != CTLARI) {
5555 ash_msg_and_raise_error("missing CTLARI (shouldn't happen)");
5560 esc = esclen(start, p);
5570 removerecordregions(begoff);
5579 len = cvtnum(dash_arith(p + 2));
5582 recordregion(begoff, begoff + len, 0);
5586 /* argstr needs it */
5587 static char *evalvar(char *p, int flag, struct strlist *var_str_list);
5590 * Perform variable and command substitution. If EXP_FULL is set, output CTLESC
5591 * characters to allow for further processing. Otherwise treat
5592 * $@ like $* since no splitting will be performed.
5594 * var_str_list (can be NULL) is a list of "VAR=val" strings which take precedence
5595 * over shell varables. Needed for "A=a B=$A; echo $B" case - we use it
5596 * for correct expansion of "B=$A" word.
5599 argstr(char *p, int flag, struct strlist *var_str_list)
5601 static const char spclchars[] ALIGN1 = {
5609 CTLBACKQ | CTLQUOTE,
5610 #if ENABLE_ASH_MATH_SUPPORT
5615 const char *reject = spclchars;
5617 int quotes = flag & (EXP_FULL | EXP_CASE); /* do CTLESC */
5618 int breakall = flag & EXP_WORD;
5623 if (!(flag & EXP_VARTILDE)) {
5625 } else if (flag & EXP_VARTILDE2) {
5630 if (flag & EXP_TILDE) {
5636 if (*q == CTLESC && (flag & EXP_QWORD))
5639 p = exptilde(p, q, flag);
5642 startloc = expdest - (char *)stackblock();
5644 length += strcspn(p + length, reject);
5646 if (c && (!(c & 0x80)
5647 #if ENABLE_ASH_MATH_SUPPORT
5651 /* c == '=' || c == ':' || c == CTLENDARI */
5656 expdest = stack_nputstr(p, length, expdest);
5657 newloc = expdest - (char *)stackblock();
5658 if (breakall && !inquotes && newloc > startloc) {
5659 recordregion(startloc, newloc, 0);
5670 if (flag & EXP_VARTILDE2) {
5674 flag |= EXP_VARTILDE2;
5679 * sort of a hack - expand tildes in variable
5680 * assignments (after the first '=' and after ':'s).
5689 case CTLENDVAR: /* ??? */
5692 /* "$@" syntax adherence hack */
5695 !memcmp(p, dolatstr, 4) &&
5696 (p[4] == CTLQUOTEMARK || (
5697 p[4] == CTLENDVAR &&
5698 p[5] == CTLQUOTEMARK
5701 p = evalvar(p + 1, flag, /* var_str_list: */ NULL) + 1;
5704 inquotes = !inquotes;
5717 p = evalvar(p, flag, var_str_list);
5721 case CTLBACKQ|CTLQUOTE:
5722 expbackq(argbackq->n, c, quotes);
5723 argbackq = argbackq->next;
5725 #if ENABLE_ASH_MATH_SUPPORT
5738 scanleft(char *startp, char *rmesc, char *rmescend UNUSED_PARAM, char *str, int quotes,
5741 // This commented out code was added by James Simmons <jsimmons@infradead.org>
5742 // as part of a larger change when he added support for ${var/a/b}.
5743 // However, it broke # and % operators:
5747 //echo ${var#ab} abcdcd abcdcd
5748 //echo ${var##ab} abcdcd abcdcd
5749 //echo ${var#a*b} abcdcd ababcdcd (!)
5750 //echo ${var##a*b} cdcd cdcd
5751 //echo ${var#?} babcdcd ababcdcd (!)
5752 //echo ${var##?} babcdcd babcdcd
5753 //echo ${var#*} ababcdcd babcdcd (!)
5755 //echo ${var%cd} ababcd ababcd
5756 //echo ${var%%cd} ababcd abab (!)
5757 //echo ${var%c*d} ababcd ababcd
5758 //echo ${var%%c*d} abab ababcdcd (!)
5759 //echo ${var%?} ababcdc ababcdc
5760 //echo ${var%%?} ababcdc ababcdcd (!)
5761 //echo ${var%*} ababcdcd ababcdcd
5764 // Commenting it back out helped. Remove it completely if it really
5767 char *loc, *loc2; //, *full;
5773 int match; // = strlen(str);
5774 const char *s = loc2;
5781 match = pmatch(str, s); // this line was deleted
5783 // // chop off end if its '*'
5784 // full = strrchr(str, '*');
5785 // if (full && full != str)
5788 // // If str starts with '*' replace with s.
5789 // if ((*str == '*') && strlen(s) >= match) {
5790 // full = xstrdup(s);
5791 // strncpy(full+strlen(s)-match+1, str+1, match-1);
5793 // full = xstrndup(str, match);
5794 // match = strncmp(s, full, strlen(full));
5798 if (match) // if (!match)
5800 if (quotes && *loc == CTLESC)
5809 scanright(char *startp, char *rmesc, char *rmescend, char *str, int quotes,
5816 for (loc = str - 1, loc2 = rmescend; loc >= startp; loc2--) {
5819 const char *s = loc2;
5824 match = pmatch(str, s);
5831 esc = esclen(startp, loc);
5842 static void varunset(const char *, const char *, const char *, int) NORETURN;
5844 varunset(const char *end, const char *var, const char *umsg, int varflags)
5850 msg = "parameter not set";
5852 if (*end == CTLENDVAR) {
5853 if (varflags & VSNUL)
5858 ash_msg_and_raise_error("%.*s: %s%s", end - var - 1, var, msg, tail);
5861 #if ENABLE_ASH_BASH_COMPAT
5863 parse_sub_pattern(char *arg, int inquotes)
5865 char *idx, *repl = NULL;
5874 /* Only the first '/' seen is our separator */
5881 if (!inquotes && c == '\\' && arg[1] == '\\')
5882 arg++; /* skip both \\, not just first one */
5889 #endif /* ENABLE_ASH_BASH_COMPAT */
5892 subevalvar(char *p, char *str, int strloc, int subtype,
5893 int startloc, int varflags, int quotes, struct strlist *var_str_list)
5895 struct nodelist *saveargbackq = argbackq;
5898 char *rmesc, *rmescend;
5899 USE_ASH_BASH_COMPAT(char *repl = NULL;)
5900 USE_ASH_BASH_COMPAT(char null = '\0';)
5901 USE_ASH_BASH_COMPAT(int pos, len, orig_len;)
5902 int saveherefd = herefd;
5903 int amount, workloc, resetloc;
5905 char *(*scan)(char*, char*, char*, char*, int, int);
5908 argstr(p, (subtype != VSASSIGN && subtype != VSQUESTION) ? EXP_CASE : 0,
5910 STPUTC('\0', expdest);
5911 herefd = saveherefd;
5912 argbackq = saveargbackq;
5913 startp = (char *)stackblock() + startloc;
5917 setvar(str, startp, 0);
5918 amount = startp - expdest;
5919 STADJUST(amount, expdest);
5922 #if ENABLE_ASH_BASH_COMPAT
5924 loc = str = stackblock() + strloc;
5925 // TODO: number() instead? It does error checking...
5927 len = str - startp - 1;
5929 /* *loc != '\0', guaranteed by parser */
5933 /* We must adjust the length by the number of escapes we find. */
5934 for (ptr = startp; ptr < (str - 1); ptr++) {
5935 if(*ptr == CTLESC) {
5943 if (*loc++ == ':') {
5944 // TODO: number() instead? It does error checking...
5948 while (*loc && *loc != ':')
5951 // TODO: number() instead? It does error checking...
5954 if (pos >= orig_len) {
5958 if (len > (orig_len - pos))
5959 len = orig_len - pos;
5961 for (str = startp; pos; str++, pos--) {
5962 if (quotes && *str == CTLESC)
5965 for (loc = startp; len; len--) {
5966 if (quotes && *str == CTLESC)
5971 amount = loc - expdest;
5972 STADJUST(amount, expdest);
5977 varunset(p, str, startp, varflags);
5980 resetloc = expdest - (char *)stackblock();
5982 /* We'll comeback here if we grow the stack while handling
5983 * a VSREPLACE or VSREPLACEALL, since our pointers into the
5984 * stack will need rebasing, and we'll need to remove our work
5987 USE_ASH_BASH_COMPAT(restart:)
5989 amount = expdest - ((char *)stackblock() + resetloc);
5990 STADJUST(-amount, expdest);
5991 startp = (char *)stackblock() + startloc;
5994 rmescend = (char *)stackblock() + strloc;
5996 rmesc = _rmescapes(startp, RMESCAPE_ALLOC | RMESCAPE_GROW);
5997 if (rmesc != startp) {
5999 startp = (char *)stackblock() + startloc;
6003 str = (char *)stackblock() + strloc;
6004 preglob(str, varflags & VSQUOTE, 0);
6005 workloc = expdest - (char *)stackblock();
6007 #if ENABLE_ASH_BASH_COMPAT
6008 if (subtype == VSREPLACE || subtype == VSREPLACEALL) {
6009 char *idx, *end, *restart_detect;
6012 repl = parse_sub_pattern(str, varflags & VSQUOTE);
6017 /* If there's no pattern to match, return the expansion unmolested */
6025 loc = scanright(idx, rmesc, rmescend, str, quotes, 1);
6027 /* No match, advance */
6028 restart_detect = stackblock();
6029 STPUTC(*idx, expdest);
6030 if (quotes && *idx == CTLESC) {
6033 STPUTC(*idx, expdest);
6035 if (stackblock() != restart_detect)
6043 if (subtype == VSREPLACEALL) {
6045 if (quotes && *idx == CTLESC)
6053 for (loc = repl; *loc; loc++) {
6054 restart_detect = stackblock();
6055 STPUTC(*loc, expdest);
6056 if (stackblock() != restart_detect)
6061 if (subtype == VSREPLACE) {
6063 restart_detect = stackblock();
6064 STPUTC(*idx, expdest);
6065 if (stackblock() != restart_detect)
6074 /* We've put the replaced text into a buffer at workloc, now
6075 * move it to the right place and adjust the stack.
6077 startp = stackblock() + startloc;
6078 STPUTC('\0', expdest);
6079 memmove(startp, stackblock() + workloc, len);
6080 startp[len++] = '\0';
6081 amount = expdest - ((char *)stackblock() + startloc + len - 1);
6082 STADJUST(-amount, expdest);
6085 #endif /* ENABLE_ASH_BASH_COMPAT */
6087 subtype -= VSTRIMRIGHT;
6089 if (subtype < 0 || subtype > 7)
6092 /* zero = subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX */
6093 zero = subtype >> 1;
6094 /* VSTRIMLEFT/VSTRIMRIGHTMAX -> scanleft */
6095 scan = (subtype & 1) ^ zero ? scanleft : scanright;
6097 loc = scan(startp, rmesc, rmescend, str, quotes, zero);
6100 memmove(startp, loc, str - loc);
6101 loc = startp + (str - loc) - 1;
6104 amount = loc - expdest;
6105 STADJUST(amount, expdest);
6111 * Add the value of a specialized variable to the stack string.
6114 varvalue(char *name, int varflags, int flags, struct strlist *var_str_list)
6124 int quoted = varflags & VSQUOTE;
6125 int subtype = varflags & VSTYPE;
6126 int quotes = flags & (EXP_FULL | EXP_CASE);
6128 if (quoted && (flags & EXP_FULL))
6129 sep = 1 << CHAR_BIT;
6131 syntax = quoted ? DQSYNTAX : BASESYNTAX;
6140 num = shellparam.nparam;
6150 p = makestrspace(NOPTS, expdest);
6151 for (i = NOPTS - 1; i >= 0; i--) {
6153 USTPUTC(optletters(i), p);
6164 sep = ifsset() ? signed_char2int(ifsval()[0]) : ' ';
6165 if (quotes && (SIT(sep, syntax) == CCTL || SIT(sep, syntax) == CBACK))
6171 while ((p = *ap++)) {
6174 partlen = strlen(p);
6177 if (!(subtype == VSPLUS || subtype == VSLENGTH))
6178 memtodest(p, partlen, syntax, quotes);
6184 if (subtype == VSPLUS || subtype == VSLENGTH) {
6205 // TODO: number() instead? It does error checking...
6207 if (num < 0 || num > shellparam.nparam)
6209 p = num ? shellparam.p[num - 1] : arg0;
6212 /* NB: name has form "VAR=..." */
6214 /* "A=a B=$A" case: var_str_list is a list of "A=a" strings
6215 * which should be considered before we check variables. */
6217 unsigned name_len = (strchrnul(name, '=') - name) + 1;
6221 str = var_str_list->text;
6222 eq = strchr(str, '=');
6223 if (!eq) /* stop at first non-assignment */
6226 if (name_len == (unsigned)(eq - str)
6227 && strncmp(str, name, name_len) == 0) {
6229 /* goto value; - WRONG! */
6230 /* think "A=1 A=2 B=$A" */
6232 var_str_list = var_str_list->next;
6233 } while (var_str_list);
6237 p = lookupvar(name);
6243 if (!(subtype == VSPLUS || subtype == VSLENGTH))
6244 memtodest(p, len, syntax, quotes);
6248 if (subtype == VSPLUS || subtype == VSLENGTH)
6249 STADJUST(-len, expdest);
6254 * Expand a variable, and return a pointer to the next character in the
6258 evalvar(char *p, int flag, struct strlist *var_str_list)
6270 subtype = varflags & VSTYPE;
6271 quoted = varflags & VSQUOTE;
6273 easy = (!quoted || (*var == '@' && shellparam.nparam));
6274 startloc = expdest - (char *)stackblock();
6275 p = strchr(p, '=') + 1;
6278 varlen = varvalue(var, varflags, flag, var_str_list);
6279 if (varflags & VSNUL)
6282 if (subtype == VSPLUS) {
6283 varlen = -1 - varlen;
6287 if (subtype == VSMINUS) {
6291 p, flag | EXP_TILDE |
6292 (quoted ? EXP_QWORD : EXP_WORD),
6302 if (subtype == VSASSIGN || subtype == VSQUESTION) {
6304 if (subevalvar(p, var, /* strloc: */ 0,
6305 subtype, startloc, varflags,
6311 * Remove any recorded regions beyond
6314 removerecordregions(startloc);
6324 if (varlen < 0 && uflag)
6325 varunset(p, var, 0, 0);
6327 if (subtype == VSLENGTH) {
6328 cvtnum(varlen > 0 ? varlen : 0);
6332 if (subtype == VSNORMAL) {
6343 case VSTRIMRIGHTMAX:
6344 #if ENABLE_ASH_BASH_COMPAT
6357 * Terminate the string and start recording the pattern
6360 STPUTC('\0', expdest);
6361 patloc = expdest - (char *)stackblock();
6362 if (0 == subevalvar(p, /* str: */ NULL, patloc, subtype,
6364 /* quotes: */ flag & (EXP_FULL | EXP_CASE),
6367 int amount = expdest - (
6368 (char *)stackblock() + patloc - 1
6370 STADJUST(-amount, expdest);
6372 /* Remove any recorded regions beyond start of variable */
6373 removerecordregions(startloc);
6375 recordregion(startloc, expdest - (char *)stackblock(), quoted);
6379 if (subtype != VSNORMAL) { /* skip to end of alternative */
6385 else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) {
6387 argbackq = argbackq->next;
6388 } else if (c == CTLVAR) {
6389 if ((*p++ & VSTYPE) != VSNORMAL)
6391 } else if (c == CTLENDVAR) {
6401 * Break the argument string into pieces based upon IFS and add the
6402 * strings to the argument list. The regions of the string to be
6403 * searched for IFS characters have been stored by recordregion.
6406 ifsbreakup(char *string, struct arglist *arglist)
6408 struct ifsregion *ifsp;
6413 const char *ifs, *realifs;
6418 if (ifslastp != NULL) {
6421 realifs = ifsset() ? ifsval() : defifs;
6424 p = string + ifsp->begoff;
6425 nulonly = ifsp->nulonly;
6426 ifs = nulonly ? nullstr : realifs;
6428 while (p < string + ifsp->endoff) {
6432 if (!strchr(ifs, *p)) {
6437 ifsspc = (strchr(defifs, *p) != NULL);
6438 /* Ignore IFS whitespace at start */
6439 if (q == start && ifsspc) {
6445 sp = stzalloc(sizeof(*sp));
6447 *arglist->lastp = sp;
6448 arglist->lastp = &sp->next;
6452 if (p >= string + ifsp->endoff) {
6458 if (strchr(ifs, *p) == NULL) {
6462 if (strchr(defifs, *p) == NULL) {
6477 } while (ifsp != NULL);
6486 sp = stzalloc(sizeof(*sp));
6488 *arglist->lastp = sp;
6489 arglist->lastp = &sp->next;
6495 struct ifsregion *p;
6500 struct ifsregion *ifsp;
6506 ifsfirst.next = NULL;
6511 * Add a file name to the list.
6514 addfname(const char *name)
6518 sp = stzalloc(sizeof(*sp));
6519 sp->text = ststrdup(name);
6521 exparg.lastp = &sp->next;
6524 static char *expdir;
6527 * Do metacharacter (i.e. *, ?, [...]) expansion.
6530 expmeta(char *enddir, char *name)
6545 for (p = name; *p; p++) {
6546 if (*p == '*' || *p == '?')
6548 else if (*p == '[') {
6555 if (*q == '/' || *q == '\0')
6562 } else if (*p == '\\')
6564 else if (*p == '/') {
6571 if (metaflag == 0) { /* we've reached the end of the file name */
6572 if (enddir != expdir)
6580 if (metaflag == 0 || lstat(expdir, &statb) >= 0)
6591 } while (p < start);
6593 if (enddir == expdir) {
6595 } else if (enddir == expdir + 1 && *expdir == '/') {
6604 if (enddir != expdir)
6606 if (*endname == 0) {
6618 while (!intpending && (dp = readdir(dirp)) != NULL) {
6619 if (dp->d_name[0] == '.' && !matchdot)
6621 if (pmatch(start, dp->d_name)) {
6623 strcpy(enddir, dp->d_name);
6626 for (p = enddir, cp = dp->d_name; (*p++ = *cp++) != '\0';)
6629 expmeta(p, endname);
6638 static struct strlist *
6639 msort(struct strlist *list, int len)
6641 struct strlist *p, *q = NULL;
6642 struct strlist **lpp;
6650 for (n = half; --n >= 0;) {
6654 q->next = NULL; /* terminate first half of list */
6655 q = msort(list, half); /* sort first half of list */
6656 p = msort(p, len - half); /* sort second half */
6659 #if ENABLE_LOCALE_SUPPORT
6660 if (strcoll(p->text, q->text) < 0)
6662 if (strcmp(p->text, q->text) < 0)
6686 * Sort the results of file name expansion. It calculates the number of
6687 * strings to sort and then calls msort (short for merge sort) to do the
6690 static struct strlist *
6691 expsort(struct strlist *str)
6697 for (sp = str; sp; sp = sp->next)
6699 return msort(str, len);
6703 expandmeta(struct strlist *str /*, int flag*/)
6705 static const char metachars[] ALIGN1 = {
6708 /* TODO - EXP_REDIR */
6711 struct strlist **savelastp;
6717 if (!strpbrk(str->text, metachars))
6719 savelastp = exparg.lastp;
6722 p = preglob(str->text, 0, RMESCAPE_ALLOC | RMESCAPE_HEAP);
6724 int i = strlen(str->text);
6725 expdir = ckmalloc(i < 2048 ? 2048 : i); /* XXX */
6733 if (exparg.lastp == savelastp) {
6738 *exparg.lastp = str;
6739 rmescapes(str->text);
6740 exparg.lastp = &str->next;
6742 *exparg.lastp = NULL;
6743 *savelastp = sp = expsort(*savelastp);
6744 while (sp->next != NULL)
6746 exparg.lastp = &sp->next;
6753 * Perform variable substitution and command substitution on an argument,
6754 * placing the resulting list of arguments in arglist. If EXP_FULL is true,
6755 * perform splitting and file name expansion. When arglist is NULL, perform
6756 * here document expansion.
6759 expandarg(union node *arg, struct arglist *arglist, int flag)
6764 argbackq = arg->narg.backquote;
6765 STARTSTACKSTR(expdest);
6766 ifsfirst.next = NULL;
6768 argstr(arg->narg.text, flag,
6769 /* var_str_list: */ arglist ? arglist->list : NULL);
6770 p = _STPUTC('\0', expdest);
6772 if (arglist == NULL) {
6773 return; /* here document expanded */
6775 p = grabstackstr(p);
6776 exparg.lastp = &exparg.list;
6780 if (flag & EXP_FULL) {
6781 ifsbreakup(p, &exparg);
6782 *exparg.lastp = NULL;
6783 exparg.lastp = &exparg.list;
6784 expandmeta(exparg.list /*, flag*/);
6786 if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */
6788 sp = stzalloc(sizeof(*sp));
6791 exparg.lastp = &sp->next;
6795 *exparg.lastp = NULL;
6797 *arglist->lastp = exparg.list;
6798 arglist->lastp = exparg.lastp;
6803 * Expand shell variables and backquotes inside a here document.
6806 expandhere(union node *arg, int fd)
6809 expandarg(arg, (struct arglist *)NULL, 0);
6810 full_write(fd, stackblock(), expdest - (char *)stackblock());
6814 * Returns true if the pattern matches the string.
6817 patmatch(char *pattern, const char *string)
6819 return pmatch(preglob(pattern, 0, 0), string);
6823 * See if a pattern matches in a case statement.
6826 casematch(union node *pattern, char *val)
6828 struct stackmark smark;
6831 setstackmark(&smark);
6832 argbackq = pattern->narg.backquote;
6833 STARTSTACKSTR(expdest);
6835 argstr(pattern->narg.text, EXP_TILDE | EXP_CASE,
6836 /* var_str_list: */ NULL);
6837 STACKSTRNUL(expdest);
6838 result = patmatch(stackblock(), val);
6839 popstackmark(&smark);
6844 /* ============ find_command */
6848 int (*builtin)(int, char **);
6849 /* unsigned flags; */
6851 #define IS_BUILTIN_SPECIAL(b) ((b)->name[0] & 1)
6852 /* "regular" builtins always take precedence over commands,
6853 * regardless of PATH=....%builtin... position */
6854 #define IS_BUILTIN_REGULAR(b) ((b)->name[0] & 2)
6855 #define IS_BUILTIN_ASSIGN(b) ((b)->name[0] & 4)
6858 smallint cmdtype; /* CMDxxx */
6861 /* index >= 0 for commands without path (slashes) */
6862 /* (TODO: what exactly does the value mean? PATH position?) */
6863 /* index == -1 for commands with slashes */
6864 /* index == (-2 - applet_no) for NOFORK applets */
6865 const struct builtincmd *cmd;
6866 struct funcnode *func;
6869 /* values of cmdtype */
6870 #define CMDUNKNOWN -1 /* no entry in table for command */
6871 #define CMDNORMAL 0 /* command is an executable program */
6872 #define CMDFUNCTION 1 /* command is a shell function */
6873 #define CMDBUILTIN 2 /* command is a shell builtin */
6875 /* action to find_command() */
6876 #define DO_ERR 0x01 /* prints errors */
6877 #define DO_ABS 0x02 /* checks absolute paths */
6878 #define DO_NOFUNC 0x04 /* don't return shell functions, for command */
6879 #define DO_ALTPATH 0x08 /* using alternate path */
6880 #define DO_ALTBLTIN 0x20 /* %builtin in alt. path */
6882 static void find_command(char *, struct cmdentry *, int, const char *);
6885 /* ============ Hashing commands */
6888 * When commands are first encountered, they are entered in a hash table.
6889 * This ensures that a full path search will not have to be done for them
6890 * on each invocation.
6892 * We should investigate converting to a linear search, even though that
6893 * would make the command name "hash" a misnomer.
6897 struct tblentry *next; /* next entry in hash chain */
6898 union param param; /* definition of builtin function */
6899 smallint cmdtype; /* CMDxxx */
6900 char rehash; /* if set, cd done since entry created */
6901 char cmdname[1]; /* name of command */
6904 static struct tblentry **cmdtable;
6905 #define INIT_G_cmdtable() do { \
6906 cmdtable = xzalloc(CMDTABLESIZE * sizeof(cmdtable[0])); \
6909 static int builtinloc = -1; /* index in path of %builtin, or -1 */
6913 tryexec(USE_FEATURE_SH_STANDALONE(int applet_no,) char *cmd, char **argv, char **envp)
6917 #if ENABLE_FEATURE_SH_STANDALONE
6918 if (applet_no >= 0) {
6919 if (APPLET_IS_NOEXEC(applet_no))
6920 run_applet_no_and_exit(applet_no, argv);
6921 /* re-exec ourselves with the new arguments */
6922 execve(bb_busybox_exec_path, argv, envp);
6923 /* If they called chroot or otherwise made the binary no longer
6924 * executable, fall through */
6931 execve(cmd, argv, envp);
6932 } while (errno == EINTR);
6934 execve(cmd, argv, envp);
6940 if (errno == ENOEXEC) {
6944 for (ap = argv; *ap; ap++)
6946 ap = new = ckmalloc((ap - argv + 2) * sizeof(ap[0]));
6948 ap[0] = cmd = (char *)DEFAULT_SHELL;
6951 while ((*ap++ = *argv++) != NULL)
6960 * Exec a program. Never returns. If you change this routine, you may
6961 * have to change the find_command routine as well.
6963 static void shellexec(char **, const char *, int) NORETURN;
6965 shellexec(char **argv, const char *path, int idx)
6971 #if ENABLE_FEATURE_SH_STANDALONE
6976 envp = listvars(VEXPORT, VUNSET, 0);
6977 if (strchr(argv[0], '/') != NULL
6978 #if ENABLE_FEATURE_SH_STANDALONE
6979 || (applet_no = find_applet_by_name(argv[0])) >= 0
6982 tryexec(USE_FEATURE_SH_STANDALONE(applet_no,) argv[0], argv, envp);
6986 while ((cmdname = padvance(&path, argv[0])) != NULL) {
6987 if (--idx < 0 && pathopt == NULL) {
6988 tryexec(USE_FEATURE_SH_STANDALONE(-1,) cmdname, argv, envp);
6989 if (errno != ENOENT && errno != ENOTDIR)
6996 /* Map to POSIX errors */
7008 exitstatus = exerrno;
7009 TRACE(("shellexec failed for %s, errno %d, suppressint %d\n",
7010 argv[0], e, suppressint));
7011 ash_msg_and_raise(EXEXEC, "%s: %s", argv[0], errmsg(e, "not found"));
7016 printentry(struct tblentry *cmdp)
7022 idx = cmdp->param.index;
7025 name = padvance(&path, cmdp->cmdname);
7027 } while (--idx >= 0);
7028 out1fmt("%s%s\n", name, (cmdp->rehash ? "*" : nullstr));
7032 * Clear out command entries. The argument specifies the first entry in
7033 * PATH which has changed.
7036 clearcmdentry(int firstchange)
7038 struct tblentry **tblp;
7039 struct tblentry **pp;
7040 struct tblentry *cmdp;
7043 for (tblp = cmdtable; tblp < &cmdtable[CMDTABLESIZE]; tblp++) {
7045 while ((cmdp = *pp) != NULL) {
7046 if ((cmdp->cmdtype == CMDNORMAL &&
7047 cmdp->param.index >= firstchange)
7048 || (cmdp->cmdtype == CMDBUILTIN &&
7049 builtinloc >= firstchange)
7062 * Locate a command in the command hash table. If "add" is nonzero,
7063 * add the command to the table if it is not already present. The
7064 * variable "lastcmdentry" is set to point to the address of the link
7065 * pointing to the entry, so that delete_cmd_entry can delete the
7068 * Interrupts must be off if called with add != 0.
7070 static struct tblentry **lastcmdentry;
7072 static struct tblentry *
7073 cmdlookup(const char *name, int add)
7075 unsigned int hashval;
7077 struct tblentry *cmdp;
7078 struct tblentry **pp;
7081 hashval = (unsigned char)*p << 4;
7083 hashval += (unsigned char)*p++;
7085 pp = &cmdtable[hashval % CMDTABLESIZE];
7086 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7087 if (strcmp(cmdp->cmdname, name) == 0)
7091 if (add && cmdp == NULL) {
7092 cmdp = *pp = ckzalloc(sizeof(struct tblentry)
7094 /* + 1 - already done because
7095 * tblentry::cmdname is char[1] */);
7096 /*cmdp->next = NULL; - ckzalloc did it */
7097 cmdp->cmdtype = CMDUNKNOWN;
7098 strcpy(cmdp->cmdname, name);
7105 * Delete the command entry returned on the last lookup.
7108 delete_cmd_entry(void)
7110 struct tblentry *cmdp;
7113 cmdp = *lastcmdentry;
7114 *lastcmdentry = cmdp->next;
7115 if (cmdp->cmdtype == CMDFUNCTION)
7116 freefunc(cmdp->param.func);
7122 * Add a new command entry, replacing any existing command entry for
7123 * the same name - except special builtins.
7126 addcmdentry(char *name, struct cmdentry *entry)
7128 struct tblentry *cmdp;
7130 cmdp = cmdlookup(name, 1);
7131 if (cmdp->cmdtype == CMDFUNCTION) {
7132 freefunc(cmdp->param.func);
7134 cmdp->cmdtype = entry->cmdtype;
7135 cmdp->param = entry->u;
7140 hashcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
7142 struct tblentry **pp;
7143 struct tblentry *cmdp;
7145 struct cmdentry entry;
7148 if (nextopt("r") != '\0') {
7153 if (*argptr == NULL) {
7154 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
7155 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7156 if (cmdp->cmdtype == CMDNORMAL)
7164 while ((name = *argptr) != NULL) {
7165 cmdp = cmdlookup(name, 0);
7167 && (cmdp->cmdtype == CMDNORMAL
7168 || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))
7172 find_command(name, &entry, DO_ERR, pathval());
7173 if (entry.cmdtype == CMDUNKNOWN)
7181 * Called when a cd is done. Marks all commands so the next time they
7182 * are executed they will be rehashed.
7187 struct tblentry **pp;
7188 struct tblentry *cmdp;
7190 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
7191 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7192 if (cmdp->cmdtype == CMDNORMAL
7193 || (cmdp->cmdtype == CMDBUILTIN
7194 && !IS_BUILTIN_REGULAR(cmdp->param.cmd)
7204 * Fix command hash table when PATH changed.
7205 * Called before PATH is changed. The argument is the new value of PATH;
7206 * pathval() still returns the old value at this point.
7207 * Called with interrupts off.
7210 changepath(const char *new)
7218 firstchange = 9999; /* assume no change */
7224 if ((*old == '\0' && *new == ':')
7225 || (*old == ':' && *new == '\0'))
7227 old = new; /* ignore subsequent differences */
7231 if (*new == '%' && idx_bltin < 0 && prefix(new + 1, "builtin"))
7237 if (builtinloc < 0 && idx_bltin >= 0)
7238 builtinloc = idx_bltin; /* zap builtins */
7239 if (builtinloc >= 0 && idx_bltin < 0)
7241 clearcmdentry(firstchange);
7242 builtinloc = idx_bltin;
7257 #define TENDBQUOTE 12
7274 typedef smallint token_id_t;
7276 /* first char is indicating which tokens mark the end of a list */
7277 static const char *const tokname_array[] = {
7291 #define KWDOFFSET 13
7292 /* the following are keywords */
7314 static char buf[16];
7317 //if (tok < TSEMI) return tokname_array[tok] + 1;
7318 //sprintf(buf, "\"%s\"", tokname_array[tok] + 1);
7323 sprintf(buf + (tok >= TSEMI), "%s%c",
7324 tokname_array[tok] + 1, (tok >= TSEMI ? '"' : 0));
7328 /* Wrapper around strcmp for qsort/bsearch/... */
7330 pstrcmp(const void *a, const void *b)
7332 return strcmp((char*) a, (*(char**) b) + 1);
7335 static const char *const *
7336 findkwd(const char *s)
7338 return bsearch(s, tokname_array + KWDOFFSET,
7339 ARRAY_SIZE(tokname_array) - KWDOFFSET,
7340 sizeof(tokname_array[0]), pstrcmp);
7344 * Locate and print what a word is...
7347 describe_command(char *command, int describe_command_verbose)
7349 struct cmdentry entry;
7350 struct tblentry *cmdp;
7351 #if ENABLE_ASH_ALIAS
7352 const struct alias *ap;
7354 const char *path = pathval();
7356 if (describe_command_verbose) {
7360 /* First look at the keywords */
7361 if (findkwd(command)) {
7362 out1str(describe_command_verbose ? " is a shell keyword" : command);
7366 #if ENABLE_ASH_ALIAS
7367 /* Then look at the aliases */
7368 ap = lookupalias(command, 0);
7370 if (!describe_command_verbose) {
7375 out1fmt(" is an alias for %s", ap->val);
7379 /* Then check if it is a tracked alias */
7380 cmdp = cmdlookup(command, 0);
7382 entry.cmdtype = cmdp->cmdtype;
7383 entry.u = cmdp->param;
7385 /* Finally use brute force */
7386 find_command(command, &entry, DO_ABS, path);
7389 switch (entry.cmdtype) {
7391 int j = entry.u.index;
7397 p = padvance(&path, command);
7401 if (describe_command_verbose) {
7403 (cmdp ? " a tracked alias for" : nullstr), p
7412 if (describe_command_verbose) {
7413 out1str(" is a shell function");
7420 if (describe_command_verbose) {
7421 out1fmt(" is a %sshell builtin",
7422 IS_BUILTIN_SPECIAL(entry.u.cmd) ?
7423 "special " : nullstr
7431 if (describe_command_verbose) {
7432 out1str(": not found\n");
7437 outstr("\n", stdout);
7442 typecmd(int argc UNUSED_PARAM, char **argv)
7448 /* type -p ... ? (we don't bother checking for 'p') */
7449 if (argv[1] && argv[1][0] == '-') {
7454 err |= describe_command(argv[i++], verbose);
7459 #if ENABLE_ASH_CMDCMD
7461 commandcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
7469 while ((c = nextopt("pvV")) != '\0')
7471 verify |= VERIFY_VERBOSE;
7473 verify |= VERIFY_BRIEF;
7478 /* Mimic bash: just "command -v" doesn't complain, it's a nop */
7479 if (verify && (*argptr != NULL)) {
7480 return describe_command(*argptr, verify - VERIFY_BRIEF);
7488 /* ============ eval.c */
7490 static int funcblocksize; /* size of structures in function */
7491 static int funcstringsize; /* size of strings in node */
7492 static void *funcblock; /* block to allocate function from */
7493 static char *funcstring; /* block to allocate strings from */
7495 /* flags in argument to evaltree */
7496 #define EV_EXIT 01 /* exit after evaluating tree */
7497 #define EV_TESTED 02 /* exit status is checked; ignore -e flag */
7498 #define EV_BACKCMD 04 /* command executing within back quotes */
7500 static const short nodesize[26] = {
7501 SHELL_ALIGN(sizeof(struct ncmd)),
7502 SHELL_ALIGN(sizeof(struct npipe)),
7503 SHELL_ALIGN(sizeof(struct nredir)),
7504 SHELL_ALIGN(sizeof(struct nredir)),
7505 SHELL_ALIGN(sizeof(struct nredir)),
7506 SHELL_ALIGN(sizeof(struct nbinary)),
7507 SHELL_ALIGN(sizeof(struct nbinary)),
7508 SHELL_ALIGN(sizeof(struct nbinary)),
7509 SHELL_ALIGN(sizeof(struct nif)),
7510 SHELL_ALIGN(sizeof(struct nbinary)),
7511 SHELL_ALIGN(sizeof(struct nbinary)),
7512 SHELL_ALIGN(sizeof(struct nfor)),
7513 SHELL_ALIGN(sizeof(struct ncase)),
7514 SHELL_ALIGN(sizeof(struct nclist)),
7515 SHELL_ALIGN(sizeof(struct narg)),
7516 SHELL_ALIGN(sizeof(struct narg)),
7517 SHELL_ALIGN(sizeof(struct nfile)),
7518 SHELL_ALIGN(sizeof(struct nfile)),
7519 SHELL_ALIGN(sizeof(struct nfile)),
7520 SHELL_ALIGN(sizeof(struct nfile)),
7521 SHELL_ALIGN(sizeof(struct nfile)),
7522 SHELL_ALIGN(sizeof(struct ndup)),
7523 SHELL_ALIGN(sizeof(struct ndup)),
7524 SHELL_ALIGN(sizeof(struct nhere)),
7525 SHELL_ALIGN(sizeof(struct nhere)),
7526 SHELL_ALIGN(sizeof(struct nnot)),
7529 static void calcsize(union node *n);
7532 sizenodelist(struct nodelist *lp)
7535 funcblocksize += SHELL_ALIGN(sizeof(struct nodelist));
7542 calcsize(union node *n)
7546 funcblocksize += nodesize[n->type];
7549 calcsize(n->ncmd.redirect);
7550 calcsize(n->ncmd.args);
7551 calcsize(n->ncmd.assign);
7554 sizenodelist(n->npipe.cmdlist);
7559 calcsize(n->nredir.redirect);
7560 calcsize(n->nredir.n);
7567 calcsize(n->nbinary.ch2);
7568 calcsize(n->nbinary.ch1);
7571 calcsize(n->nif.elsepart);
7572 calcsize(n->nif.ifpart);
7573 calcsize(n->nif.test);
7576 funcstringsize += strlen(n->nfor.var) + 1;
7577 calcsize(n->nfor.body);
7578 calcsize(n->nfor.args);
7581 calcsize(n->ncase.cases);
7582 calcsize(n->ncase.expr);
7585 calcsize(n->nclist.body);
7586 calcsize(n->nclist.pattern);
7587 calcsize(n->nclist.next);
7591 sizenodelist(n->narg.backquote);
7592 funcstringsize += strlen(n->narg.text) + 1;
7593 calcsize(n->narg.next);
7600 calcsize(n->nfile.fname);
7601 calcsize(n->nfile.next);
7605 calcsize(n->ndup.vname);
7606 calcsize(n->ndup.next);
7610 calcsize(n->nhere.doc);
7611 calcsize(n->nhere.next);
7614 calcsize(n->nnot.com);
7620 nodeckstrdup(char *s)
7622 char *rtn = funcstring;
7624 strcpy(funcstring, s);
7625 funcstring += strlen(s) + 1;
7629 static union node *copynode(union node *);
7631 static struct nodelist *
7632 copynodelist(struct nodelist *lp)
7634 struct nodelist *start;
7635 struct nodelist **lpp;
7640 funcblock = (char *) funcblock + SHELL_ALIGN(sizeof(struct nodelist));
7641 (*lpp)->n = copynode(lp->n);
7643 lpp = &(*lpp)->next;
7650 copynode(union node *n)
7657 funcblock = (char *) funcblock + nodesize[n->type];
7661 new->ncmd.redirect = copynode(n->ncmd.redirect);
7662 new->ncmd.args = copynode(n->ncmd.args);
7663 new->ncmd.assign = copynode(n->ncmd.assign);
7666 new->npipe.cmdlist = copynodelist(n->npipe.cmdlist);
7667 new->npipe.pipe_backgnd = n->npipe.pipe_backgnd;
7672 new->nredir.redirect = copynode(n->nredir.redirect);
7673 new->nredir.n = copynode(n->nredir.n);
7680 new->nbinary.ch2 = copynode(n->nbinary.ch2);
7681 new->nbinary.ch1 = copynode(n->nbinary.ch1);
7684 new->nif.elsepart = copynode(n->nif.elsepart);
7685 new->nif.ifpart = copynode(n->nif.ifpart);
7686 new->nif.test = copynode(n->nif.test);
7689 new->nfor.var = nodeckstrdup(n->nfor.var);
7690 new->nfor.body = copynode(n->nfor.body);
7691 new->nfor.args = copynode(n->nfor.args);
7694 new->ncase.cases = copynode(n->ncase.cases);
7695 new->ncase.expr = copynode(n->ncase.expr);
7698 new->nclist.body = copynode(n->nclist.body);
7699 new->nclist.pattern = copynode(n->nclist.pattern);
7700 new->nclist.next = copynode(n->nclist.next);
7704 new->narg.backquote = copynodelist(n->narg.backquote);
7705 new->narg.text = nodeckstrdup(n->narg.text);
7706 new->narg.next = copynode(n->narg.next);
7713 new->nfile.fname = copynode(n->nfile.fname);
7714 new->nfile.fd = n->nfile.fd;
7715 new->nfile.next = copynode(n->nfile.next);
7719 new->ndup.vname = copynode(n->ndup.vname);
7720 new->ndup.dupfd = n->ndup.dupfd;
7721 new->ndup.fd = n->ndup.fd;
7722 new->ndup.next = copynode(n->ndup.next);
7726 new->nhere.doc = copynode(n->nhere.doc);
7727 new->nhere.fd = n->nhere.fd;
7728 new->nhere.next = copynode(n->nhere.next);
7731 new->nnot.com = copynode(n->nnot.com);
7734 new->type = n->type;
7739 * Make a copy of a parse tree.
7741 static struct funcnode *
7742 copyfunc(union node *n)
7747 funcblocksize = offsetof(struct funcnode, n);
7750 blocksize = funcblocksize;
7751 f = ckmalloc(blocksize + funcstringsize);
7752 funcblock = (char *) f + offsetof(struct funcnode, n);
7753 funcstring = (char *) f + blocksize;
7760 * Define a shell function.
7763 defun(char *name, union node *func)
7765 struct cmdentry entry;
7768 entry.cmdtype = CMDFUNCTION;
7769 entry.u.func = copyfunc(func);
7770 addcmdentry(name, &entry);
7774 static int evalskip; /* set if we are skipping commands */
7775 /* reasons for skipping commands (see comment on breakcmd routine) */
7776 #define SKIPBREAK (1 << 0)
7777 #define SKIPCONT (1 << 1)
7778 #define SKIPFUNC (1 << 2)
7779 #define SKIPFILE (1 << 3)
7780 #define SKIPEVAL (1 << 4)
7781 static int skipcount; /* number of levels to skip */
7782 static int funcnest; /* depth of function calls */
7783 static int loopnest; /* current loop nesting level */
7785 /* forward decl way out to parsing code - dotrap needs it */
7786 static int evalstring(char *s, int mask);
7789 * Called to execute a trap. Perhaps we should avoid entering new trap
7790 * handlers while we are executing a trap handler.
7801 savestatus = exitstatus;
7805 for (i = 0, q = gotsig; i < NSIG - 1; i++, q++) {
7813 skip = evalstring(p, SKIPEVAL);
7814 exitstatus = savestatus;
7822 /* forward declarations - evaluation is fairly recursive business... */
7823 static void evalloop(union node *, int);
7824 static void evalfor(union node *, int);
7825 static void evalcase(union node *, int);
7826 static void evalsubshell(union node *, int);
7827 static void expredir(union node *);
7828 static void evalpipe(union node *, int);
7829 static void evalcommand(union node *, int);
7830 static int evalbltin(const struct builtincmd *, int, char **);
7831 static void prehash(union node *);
7834 * Evaluate a parse tree. The value is left in the global variable
7838 evaltree(union node *n, int flags)
7841 void (*evalfn)(union node *, int);
7845 TRACE(("evaltree(NULL) called\n"));
7848 TRACE(("pid %d, evaltree(%p: %d, %d) called\n",
7849 getpid(), n, n->type, flags));
7853 out1fmt("Node type = %d\n", n->type);
7858 evaltree(n->nnot.com, EV_TESTED);
7859 status = !exitstatus;
7862 expredir(n->nredir.redirect);
7863 status = redirectsafe(n->nredir.redirect, REDIR_PUSH);
7865 evaltree(n->nredir.n, flags & EV_TESTED);
7866 status = exitstatus;
7871 evalfn = evalcommand;
7873 if (eflag && !(flags & EV_TESTED))
7885 evalfn = evalsubshell;
7897 #error NAND + 1 != NOR
7899 #if NOR + 1 != NSEMI
7900 #error NOR + 1 != NSEMI
7902 isor = n->type - NAND;
7905 (flags | ((isor >> 1) - 1)) & EV_TESTED
7907 if (!exitstatus == isor)
7919 evaltree(n->nif.test, EV_TESTED);
7922 if (exitstatus == 0) {
7925 } else if (n->nif.elsepart) {
7926 n = n->nif.elsepart;
7931 defun(n->narg.text, n->narg.next);
7935 exitstatus = status;
7939 if ((checkexit & exitstatus))
7940 evalskip |= SKIPEVAL;
7941 else if (pendingsig && dotrap())
7944 if (flags & EV_EXIT) {
7946 raise_exception(EXEXIT);
7950 #if !defined(__alpha__) || (defined(__GNUC__) && __GNUC__ >= 3)
7953 void evaltreenr(union node *, int) __attribute__ ((alias("evaltree"),__noreturn__));
7956 evalloop(union node *n, int flags)
7966 evaltree(n->nbinary.ch1, EV_TESTED);
7969 if (evalskip == SKIPCONT && --skipcount <= 0) {
7973 if (evalskip == SKIPBREAK && --skipcount <= 0)
7978 if (n->type != NWHILE)
7982 evaltree(n->nbinary.ch2, flags);
7983 status = exitstatus;
7988 exitstatus = status;
7992 evalfor(union node *n, int flags)
7994 struct arglist arglist;
7997 struct stackmark smark;
7999 setstackmark(&smark);
8000 arglist.list = NULL;
8001 arglist.lastp = &arglist.list;
8002 for (argp = n->nfor.args; argp; argp = argp->narg.next) {
8003 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE | EXP_RECORD);
8008 *arglist.lastp = NULL;
8013 for (sp = arglist.list; sp; sp = sp->next) {
8014 setvar(n->nfor.var, sp->text, 0);
8015 evaltree(n->nfor.body, flags);
8017 if (evalskip == SKIPCONT && --skipcount <= 0) {
8021 if (evalskip == SKIPBREAK && --skipcount <= 0)
8028 popstackmark(&smark);
8032 evalcase(union node *n, int flags)
8036 struct arglist arglist;
8037 struct stackmark smark;
8039 setstackmark(&smark);
8040 arglist.list = NULL;
8041 arglist.lastp = &arglist.list;
8042 expandarg(n->ncase.expr, &arglist, EXP_TILDE);
8044 for (cp = n->ncase.cases; cp && evalskip == 0; cp = cp->nclist.next) {
8045 for (patp = cp->nclist.pattern; patp; patp = patp->narg.next) {
8046 if (casematch(patp, arglist.list->text)) {
8047 if (evalskip == 0) {
8048 evaltree(cp->nclist.body, flags);
8055 popstackmark(&smark);
8059 * Kick off a subshell to evaluate a tree.
8062 evalsubshell(union node *n, int flags)
8065 int backgnd = (n->type == NBACKGND);
8068 expredir(n->nredir.redirect);
8069 if (!backgnd && flags & EV_EXIT && !trap[0])
8072 jp = makejob(/*n,*/ 1);
8073 if (forkshell(jp, n, backgnd) == 0) {
8077 flags &=~ EV_TESTED;
8079 redirect(n->nredir.redirect, 0);
8080 evaltreenr(n->nredir.n, flags);
8085 status = waitforjob(jp);
8086 exitstatus = status;
8091 * Compute the names of the files in a redirection list.
8093 static void fixredir(union node *, const char *, int);
8095 expredir(union node *n)
8099 for (redir = n; redir; redir = redir->nfile.next) {
8103 fn.lastp = &fn.list;
8104 switch (redir->type) {
8110 expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR);
8111 redir->nfile.expfname = fn.list->text;
8115 if (redir->ndup.vname) {
8116 expandarg(redir->ndup.vname, &fn, EXP_FULL | EXP_TILDE);
8117 if (fn.list == NULL)
8118 ash_msg_and_raise_error("redir error");
8119 fixredir(redir, fn.list->text, 1);
8127 * Evaluate a pipeline. All the processes in the pipeline are children
8128 * of the process creating the pipeline. (This differs from some versions
8129 * of the shell, which make the last process in a pipeline the parent
8133 evalpipe(union node *n, int flags)
8136 struct nodelist *lp;
8141 TRACE(("evalpipe(0x%lx) called\n", (long)n));
8143 for (lp = n->npipe.cmdlist; lp; lp = lp->next)
8147 jp = makejob(/*n,*/ pipelen);
8149 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
8153 if (pipe(pip) < 0) {
8155 ash_msg_and_raise_error("pipe call failed");
8158 if (forkshell(jp, lp->n, n->npipe.pipe_backgnd) == 0) {
8171 evaltreenr(lp->n, flags);
8179 if (n->npipe.pipe_backgnd == 0) {
8180 exitstatus = waitforjob(jp);
8181 TRACE(("evalpipe: job done exit status %d\n", exitstatus));
8187 * Controls whether the shell is interactive or not.
8190 setinteractive(int on)
8192 static smallint is_interactive;
8194 if (++on == is_interactive)
8196 is_interactive = on;
8200 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
8201 if (is_interactive > 1) {
8202 /* Looks like they want an interactive shell */
8203 static smallint did_banner;
8208 "%s built-in shell (ash)\n"
8209 "Enter 'help' for a list of built-in commands."
8224 setinteractive(iflag);
8226 #if ENABLE_FEATURE_EDITING_VI
8228 line_input_state->flags |= VI_MODE;
8230 line_input_state->flags &= ~VI_MODE;
8232 viflag = 0; /* forcibly keep the option off */
8236 static struct localvar *localvars;
8239 * Called after a function returns.
8240 * Interrupts must be off.
8245 struct localvar *lvp;
8248 while ((lvp = localvars) != NULL) {
8249 localvars = lvp->next;
8251 TRACE(("poplocalvar %s", vp ? vp->text : "-"));
8252 if (vp == NULL) { /* $- saved */
8253 memcpy(optlist, lvp->text, sizeof(optlist));
8254 free((char*)lvp->text);
8256 } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) {
8260 (*vp->func)(strchrnul(lvp->text, '=') + 1);
8261 if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
8262 free((char*)vp->text);
8263 vp->flags = lvp->flags;
8264 vp->text = lvp->text;
8271 evalfun(struct funcnode *func, int argc, char **argv, int flags)
8273 volatile struct shparam saveparam;
8274 struct localvar *volatile savelocalvars;
8275 struct jmploc *volatile savehandler;
8276 struct jmploc jmploc;
8279 saveparam = shellparam;
8280 savelocalvars = localvars;
8281 e = setjmp(jmploc.loc);
8286 savehandler = exception_handler;
8287 exception_handler = &jmploc;
8289 shellparam.malloced = 0;
8293 shellparam.nparam = argc - 1;
8294 shellparam.p = argv + 1;
8295 #if ENABLE_ASH_GETOPTS
8296 shellparam.optind = 1;
8297 shellparam.optoff = -1;
8299 evaltree(&func->n, flags & EV_TESTED);
8305 localvars = savelocalvars;
8306 freeparam(&shellparam);
8307 shellparam = saveparam;
8308 exception_handler = savehandler;
8310 evalskip &= ~SKIPFUNC;
8314 #if ENABLE_ASH_CMDCMD
8316 parse_command_args(char **argv, const char **path)
8329 if (c == '-' && !*cp) {
8336 *path = bb_default_path;
8339 /* run 'typecmd' for other options */
8350 * Make a variable a local variable. When a variable is made local, it's
8351 * value and flags are saved in a localvar structure. The saved values
8352 * will be restored when the shell function returns. We handle the name
8353 * "-" as a special case.
8358 struct localvar *lvp;
8363 lvp = ckzalloc(sizeof(struct localvar));
8364 if (LONE_DASH(name)) {
8366 p = ckmalloc(sizeof(optlist));
8367 lvp->text = memcpy(p, optlist, sizeof(optlist));
8372 vpp = hashvar(name);
8373 vp = *findvar(vpp, name);
8374 eq = strchr(name, '=');
8377 setvareq(name, VSTRFIXED);
8379 setvar(name, NULL, VSTRFIXED);
8380 vp = *vpp; /* the new variable */
8381 lvp->flags = VUNSET;
8383 lvp->text = vp->text;
8384 lvp->flags = vp->flags;
8385 vp->flags |= VSTRFIXED|VTEXTFIXED;
8391 lvp->next = localvars;
8397 * The "local" command.
8400 localcmd(int argc UNUSED_PARAM, char **argv)
8405 while ((name = *argv++) != NULL) {
8412 falsecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
8418 truecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
8424 execcmd(int argc UNUSED_PARAM, char **argv)
8427 iflag = 0; /* exit on error */
8430 shellexec(argv + 1, pathval(), 0);
8436 * The return command.
8439 returncmd(int argc UNUSED_PARAM, char **argv)
8442 * If called outside a function, do what ksh does;
8443 * skip the rest of the file.
8445 evalskip = funcnest ? SKIPFUNC : SKIPFILE;
8446 return argv[1] ? number(argv[1]) : exitstatus;
8449 /* Forward declarations for builtintab[] */
8450 static int breakcmd(int, char **);
8451 static int dotcmd(int, char **);
8452 static int evalcmd(int, char **);
8453 static int exitcmd(int, char **);
8454 static int exportcmd(int, char **);
8455 #if ENABLE_ASH_GETOPTS
8456 static int getoptscmd(int, char **);
8458 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
8459 static int helpcmd(int, char **);
8461 #if ENABLE_ASH_MATH_SUPPORT
8462 static int letcmd(int, char **);
8464 static int readcmd(int, char **);
8465 static int setcmd(int, char **);
8466 static int shiftcmd(int, char **);
8467 static int timescmd(int, char **);
8468 static int trapcmd(int, char **);
8469 static int umaskcmd(int, char **);
8470 static int unsetcmd(int, char **);
8471 static int ulimitcmd(int, char **);
8473 #define BUILTIN_NOSPEC "0"
8474 #define BUILTIN_SPECIAL "1"
8475 #define BUILTIN_REGULAR "2"
8476 #define BUILTIN_SPEC_REG "3"
8477 #define BUILTIN_ASSIGN "4"
8478 #define BUILTIN_SPEC_ASSG "5"
8479 #define BUILTIN_REG_ASSG "6"
8480 #define BUILTIN_SPEC_REG_ASSG "7"
8482 /* We do not handle [[ expr ]] bashism bash-compatibly,
8483 * we make it a synonym of [ expr ].
8484 * Basically, word splitting and pathname expansion should NOT be performed
8486 * no word splitting: a="a b"; [[ $a = "a b" ]]; echo $? should print "0"
8487 * no pathname expansion: [[ /bin/m* = "/bin/m*" ]]; echo $? should print "0"
8488 * Additional operators:
8489 * || and && should work as -o and -a
8491 * Apart from the above, [[ expr ]] should work as [ expr ]
8494 #define echocmd echo_main
8495 #define printfcmd printf_main
8496 #define testcmd test_main
8498 /* Keep these in proper order since it is searched via bsearch() */
8499 static const struct builtincmd builtintab[] = {
8500 { BUILTIN_SPEC_REG ".", dotcmd },
8501 { BUILTIN_SPEC_REG ":", truecmd },
8502 #if ENABLE_ASH_BUILTIN_TEST
8503 { BUILTIN_REGULAR "[", testcmd },
8504 #if ENABLE_ASH_BASH_COMPAT
8505 { BUILTIN_REGULAR "[[", testcmd },
8508 #if ENABLE_ASH_ALIAS
8509 { BUILTIN_REG_ASSG "alias", aliascmd },
8512 { BUILTIN_REGULAR "bg", fg_bgcmd },
8514 { BUILTIN_SPEC_REG "break", breakcmd },
8515 { BUILTIN_REGULAR "cd", cdcmd },
8516 { BUILTIN_NOSPEC "chdir", cdcmd },
8517 #if ENABLE_ASH_CMDCMD
8518 { BUILTIN_REGULAR "command", commandcmd },
8520 { BUILTIN_SPEC_REG "continue", breakcmd },
8521 #if ENABLE_ASH_BUILTIN_ECHO
8522 { BUILTIN_REGULAR "echo", echocmd },
8524 { BUILTIN_SPEC_REG "eval", evalcmd },
8525 { BUILTIN_SPEC_REG "exec", execcmd },
8526 { BUILTIN_SPEC_REG "exit", exitcmd },
8527 { BUILTIN_SPEC_REG_ASSG "export", exportcmd },
8528 { BUILTIN_REGULAR "false", falsecmd },
8530 { BUILTIN_REGULAR "fg", fg_bgcmd },
8532 #if ENABLE_ASH_GETOPTS
8533 { BUILTIN_REGULAR "getopts", getoptscmd },
8535 { BUILTIN_NOSPEC "hash", hashcmd },
8536 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
8537 { BUILTIN_NOSPEC "help", helpcmd },
8540 { BUILTIN_REGULAR "jobs", jobscmd },
8541 { BUILTIN_REGULAR "kill", killcmd },
8543 #if ENABLE_ASH_MATH_SUPPORT
8544 { BUILTIN_NOSPEC "let", letcmd },
8546 { BUILTIN_ASSIGN "local", localcmd },
8547 #if ENABLE_ASH_BUILTIN_PRINTF
8548 { BUILTIN_REGULAR "printf", printfcmd },
8550 { BUILTIN_NOSPEC "pwd", pwdcmd },
8551 { BUILTIN_REGULAR "read", readcmd },
8552 { BUILTIN_SPEC_REG_ASSG "readonly", exportcmd },
8553 { BUILTIN_SPEC_REG "return", returncmd },
8554 { BUILTIN_SPEC_REG "set", setcmd },
8555 { BUILTIN_SPEC_REG "shift", shiftcmd },
8556 { BUILTIN_SPEC_REG "source", dotcmd },
8557 #if ENABLE_ASH_BUILTIN_TEST
8558 { BUILTIN_REGULAR "test", testcmd },
8560 { BUILTIN_SPEC_REG "times", timescmd },
8561 { BUILTIN_SPEC_REG "trap", trapcmd },
8562 { BUILTIN_REGULAR "true", truecmd },
8563 { BUILTIN_NOSPEC "type", typecmd },
8564 { BUILTIN_NOSPEC "ulimit", ulimitcmd },
8565 { BUILTIN_REGULAR "umask", umaskcmd },
8566 #if ENABLE_ASH_ALIAS
8567 { BUILTIN_REGULAR "unalias", unaliascmd },
8569 { BUILTIN_SPEC_REG "unset", unsetcmd },
8570 { BUILTIN_REGULAR "wait", waitcmd },
8573 /* Should match the above table! */
8574 #define COMMANDCMD (builtintab + \
8576 1 * ENABLE_ASH_BUILTIN_TEST + \
8577 1 * ENABLE_ASH_BUILTIN_TEST * ENABLE_ASH_BASH_COMPAT + \
8578 1 * ENABLE_ASH_ALIAS + \
8579 1 * ENABLE_ASH_JOB_CONTROL + \
8581 #define EXECCMD (builtintab + \
8583 1 * ENABLE_ASH_BUILTIN_TEST + \
8584 1 * ENABLE_ASH_BUILTIN_TEST * ENABLE_ASH_BASH_COMPAT + \
8585 1 * ENABLE_ASH_ALIAS + \
8586 1 * ENABLE_ASH_JOB_CONTROL + \
8588 1 * ENABLE_ASH_CMDCMD + \
8590 ENABLE_ASH_BUILTIN_ECHO + \
8594 * Search the table of builtin commands.
8596 static struct builtincmd *
8597 find_builtin(const char *name)
8599 struct builtincmd *bp;
8602 name, builtintab, ARRAY_SIZE(builtintab), sizeof(builtintab[0]),
8609 * Execute a simple command.
8612 isassignment(const char *p)
8614 const char *q = endofname(p);
8620 bltincmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
8622 /* Preserve exitstatus of a previous possible redirection
8623 * as POSIX mandates */
8624 return back_exitstatus;
8627 evalcommand(union node *cmd, int flags)
8629 static const struct builtincmd null_bltin = {
8630 "\0\0", bltincmd /* why three NULs? */
8632 struct stackmark smark;
8634 struct arglist arglist;
8635 struct arglist varlist;
8638 const struct strlist *sp;
8639 struct cmdentry cmdentry;
8647 struct builtincmd *bcmd;
8648 int pseudovarflag = 0;
8650 /* First expand the arguments. */
8651 TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags));
8652 setstackmark(&smark);
8653 back_exitstatus = 0;
8655 cmdentry.cmdtype = CMDBUILTIN;
8656 cmdentry.u.cmd = &null_bltin;
8657 varlist.lastp = &varlist.list;
8658 *varlist.lastp = NULL;
8659 arglist.lastp = &arglist.list;
8660 *arglist.lastp = NULL;
8663 if (cmd->ncmd.args) {
8664 bcmd = find_builtin(cmd->ncmd.args->narg.text);
8665 pseudovarflag = bcmd && IS_BUILTIN_ASSIGN(bcmd);
8668 for (argp = cmd->ncmd.args; argp; argp = argp->narg.next) {
8669 struct strlist **spp;
8671 spp = arglist.lastp;
8672 if (pseudovarflag && isassignment(argp->narg.text))
8673 expandarg(argp, &arglist, EXP_VARTILDE);
8675 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
8677 for (sp = *spp; sp; sp = sp->next)
8681 argv = nargv = stalloc(sizeof(char *) * (argc + 1));
8682 for (sp = arglist.list; sp; sp = sp->next) {
8683 TRACE(("evalcommand arg: %s\n", sp->text));
8684 *nargv++ = sp->text;
8689 if (iflag && funcnest == 0 && argc > 0)
8690 lastarg = nargv[-1];
8693 expredir(cmd->ncmd.redirect);
8694 status = redirectsafe(cmd->ncmd.redirect, REDIR_PUSH | REDIR_SAVEFD2);
8697 for (argp = cmd->ncmd.assign; argp; argp = argp->narg.next) {
8698 struct strlist **spp;
8701 spp = varlist.lastp;
8702 expandarg(argp, &varlist, EXP_VARTILDE);
8705 * Modify the command lookup path, if a PATH= assignment
8709 if (varequal(p, path))
8713 /* Print the command if xflag is set. */
8716 const char *p = " %s";
8719 fdprintf(preverrout_fd, p, expandstr(ps4val()));
8722 for (n = 0; n < 2; n++) {
8724 fdprintf(preverrout_fd, p, sp->text);
8732 safe_write(preverrout_fd, "\n", 1);
8738 /* Now locate the command. */
8740 const char *oldpath;
8741 int cmd_flag = DO_ERR;
8746 find_command(argv[0], &cmdentry, cmd_flag, path);
8747 if (cmdentry.cmdtype == CMDUNKNOWN) {
8753 /* implement bltin and command here */
8754 if (cmdentry.cmdtype != CMDBUILTIN)
8757 spclbltin = IS_BUILTIN_SPECIAL(cmdentry.u.cmd);
8758 if (cmdentry.u.cmd == EXECCMD)
8760 #if ENABLE_ASH_CMDCMD
8761 if (cmdentry.u.cmd == COMMANDCMD) {
8763 nargv = parse_command_args(argv, &path);
8766 argc -= nargv - argv;
8768 cmd_flag |= DO_NOFUNC;
8776 /* We have a redirection error. */
8778 raise_exception(EXERROR);
8780 exitstatus = status;
8784 /* Execute the command. */
8785 switch (cmdentry.cmdtype) {
8787 #if ENABLE_FEATURE_SH_NOFORK
8789 /* find_command() encodes applet_no as (-2 - applet_no) */
8790 int applet_no = (- cmdentry.u.index - 2);
8791 if (applet_no >= 0 && APPLET_IS_NOFORK(applet_no)) {
8792 listsetvar(varlist.list, VEXPORT|VSTACK);
8793 /* run <applet>_main() */
8794 exitstatus = run_nofork_applet(applet_no, argv);
8800 /* Fork off a child process if necessary. */
8801 if (!(flags & EV_EXIT) || trap[0]) {
8803 jp = makejob(/*cmd,*/ 1);
8804 if (forkshell(jp, cmd, FORK_FG) != 0) {
8805 exitstatus = waitforjob(jp);
8811 listsetvar(varlist.list, VEXPORT|VSTACK);
8812 shellexec(argv, path, cmdentry.u.index);
8816 cmdenviron = varlist.list;
8818 struct strlist *list = cmdenviron;
8820 if (spclbltin > 0 || argc == 0) {
8822 if (cmd_is_exec && argc > 1)
8825 listsetvar(list, i);
8827 if (evalbltin(cmdentry.u.cmd, argc, argv)) {
8834 exit_status = 128 + SIGINT;
8836 exit_status = 128 + pendingsig;
8837 exitstatus = exit_status;
8838 if (i == EXINT || spclbltin > 0) {
8840 longjmp(exception_handler->loc, 1);
8847 listsetvar(varlist.list, 0);
8848 if (evalfun(cmdentry.u.func, argc, argv, flags))
8854 popredir(cmd_is_exec);
8856 /* dsl: I think this is intended to be used to support
8857 * '_' in 'vi' command mode during line editing...
8858 * However I implemented that within libedit itself.
8860 setvar("_", lastarg, 0);
8862 popstackmark(&smark);
8866 evalbltin(const struct builtincmd *cmd, int argc, char **argv)
8868 char *volatile savecmdname;
8869 struct jmploc *volatile savehandler;
8870 struct jmploc jmploc;
8873 savecmdname = commandname;
8874 i = setjmp(jmploc.loc);
8877 savehandler = exception_handler;
8878 exception_handler = &jmploc;
8879 commandname = argv[0];
8881 optptr = NULL; /* initialize nextopt */
8882 exitstatus = (*cmd->builtin)(argc, argv);
8883 flush_stdout_stderr();
8885 exitstatus |= ferror(stdout);
8887 commandname = savecmdname;
8889 exception_handler = savehandler;
8895 goodname(const char *p)
8897 return !*endofname(p);
8902 * Search for a command. This is called before we fork so that the
8903 * location of the command will be available in the parent as well as
8904 * the child. The check for "goodname" is an overly conservative
8905 * check that the name will not be subject to expansion.
8908 prehash(union node *n)
8910 struct cmdentry entry;
8912 if (n->type == NCMD && n->ncmd.args && goodname(n->ncmd.args->narg.text))
8913 find_command(n->ncmd.args->narg.text, &entry, 0, pathval());
8917 /* ============ Builtin commands
8919 * Builtin commands whose functions are closely tied to evaluation
8920 * are implemented here.
8924 * Handle break and continue commands. Break, continue, and return are
8925 * all handled by setting the evalskip flag. The evaluation routines
8926 * above all check this flag, and if it is set they start skipping
8927 * commands rather than executing them. The variable skipcount is
8928 * the number of loops to break/continue, or the number of function
8929 * levels to return. (The latter is always 1.) It should probably
8930 * be an error to break out of more loops than exist, but it isn't
8931 * in the standard shell so we don't make it one here.
8934 breakcmd(int argc UNUSED_PARAM, char **argv)
8936 int n = argv[1] ? number(argv[1]) : 1;
8939 ash_msg_and_raise_error(illnum, argv[1]);
8943 evalskip = (**argv == 'c') ? SKIPCONT : SKIPBREAK;
8950 /* ============ input.c
8952 * This implements the input routines used by the parser.
8955 #define EOF_NLEFT -99 /* value of parsenleft when EOF pushed back */
8958 INPUT_PUSH_FILE = 1,
8959 INPUT_NOFILE_OK = 2,
8962 static int plinno = 1; /* input line number */
8963 /* number of characters left in input buffer */
8964 static int parsenleft; /* copy of parsefile->nleft */
8965 static int parselleft; /* copy of parsefile->lleft */
8966 /* next character in input buffer */
8967 static char *parsenextc; /* copy of parsefile->nextc */
8969 static smallint checkkwd;
8970 /* values of checkkwd variable */
8971 #define CHKALIAS 0x1
8978 struct strpush *sp = g_parsefile->strpush;
8981 #if ENABLE_ASH_ALIAS
8983 if (parsenextc[-1] == ' ' || parsenextc[-1] == '\t') {
8984 checkkwd |= CHKALIAS;
8986 if (sp->string != sp->ap->val) {
8989 sp->ap->flag &= ~ALIASINUSE;
8990 if (sp->ap->flag & ALIASDEAD) {
8991 unalias(sp->ap->name);
8995 parsenextc = sp->prevstring;
8996 parsenleft = sp->prevnleft;
8997 /*dprintf("*** calling popstring: restoring to '%s'\n", parsenextc);*/
8998 g_parsefile->strpush = sp->prev;
8999 if (sp != &(g_parsefile->basestrpush))
9008 char *buf = g_parsefile->buf;
9011 #if ENABLE_FEATURE_EDITING
9013 if (!iflag || g_parsefile->fd)
9014 nr = nonblock_safe_read(g_parsefile->fd, buf, BUFSIZ - 1);
9016 #if ENABLE_FEATURE_TAB_COMPLETION
9017 line_input_state->path_lookup = pathval();
9019 nr = read_line_input(cmdedit_prompt, buf, BUFSIZ, line_input_state);
9021 /* Ctrl+C pressed */
9030 if (nr < 0 && errno == 0) {
9031 /* Ctrl+D pressed */
9036 nr = nonblock_safe_read(g_parsefile->fd, buf, BUFSIZ - 1);
9040 /* nonblock_safe_read() handles this problem */
9042 if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
9043 int flags = fcntl(0, F_GETFL);
9044 if (flags >= 0 && (flags & O_NONBLOCK)) {
9045 flags &= ~O_NONBLOCK;
9046 if (fcntl(0, F_SETFL, flags) >= 0) {
9047 out2str("sh: turning off NDELAY mode\n");
9058 * Refill the input buffer and return the next input character:
9060 * 1) If a string was pushed back on the input, pop it;
9061 * 2) If an EOF was pushed back (parsenleft == EOF_NLEFT) or we are reading
9062 * from a string so we can't refill the buffer, return EOF.
9063 * 3) If the is more stuff in this buffer, use it else call read to fill it.
9064 * 4) Process input up to the next newline, deleting nul characters.
9073 while (g_parsefile->strpush) {
9074 #if ENABLE_ASH_ALIAS
9075 if (parsenleft == -1 && g_parsefile->strpush->ap &&
9076 parsenextc[-1] != ' ' && parsenextc[-1] != '\t') {
9081 if (--parsenleft >= 0)
9082 return signed_char2int(*parsenextc++);
9084 if (parsenleft == EOF_NLEFT || g_parsefile->buf == NULL)
9086 flush_stdout_stderr();
9093 parselleft = parsenleft = EOF_NLEFT;
9100 /* delete nul characters */
9108 memmove(q, q + 1, more);
9112 parsenleft = q - parsenextc - 1;
9118 parsenleft = q - parsenextc - 1;
9130 out2str(parsenextc);
9135 return signed_char2int(*parsenextc++);
9138 #define pgetc_as_macro() (--parsenleft >= 0? signed_char2int(*parsenextc++) : preadbuffer())
9142 return pgetc_as_macro();
9145 #if ENABLE_ASH_OPTIMIZE_FOR_SIZE
9146 #define pgetc_macro() pgetc()
9148 #define pgetc_macro() pgetc_as_macro()
9152 * Same as pgetc(), but ignores PEOA.
9154 #if ENABLE_ASH_ALIAS
9162 } while (c == PEOA);
9169 return pgetc_macro();
9174 * Read a line from the script.
9177 pfgets(char *line, int len)
9183 while (--nleft > 0) {
9199 * Undo the last call to pgetc. Only one character may be pushed back.
9200 * PEOF may be pushed back.
9210 * Push a string back onto the input at this current parsefile level.
9211 * We handle aliases this way.
9213 #if !ENABLE_ASH_ALIAS
9214 #define pushstring(s, ap) pushstring(s)
9217 pushstring(char *s, struct alias *ap)
9224 /*dprintf("*** calling pushstring: %s, %d\n", s, len);*/
9225 if (g_parsefile->strpush) {
9226 sp = ckzalloc(sizeof(struct strpush));
9227 sp->prev = g_parsefile->strpush;
9228 g_parsefile->strpush = sp;
9230 sp = g_parsefile->strpush = &(g_parsefile->basestrpush);
9231 sp->prevstring = parsenextc;
9232 sp->prevnleft = parsenleft;
9233 #if ENABLE_ASH_ALIAS
9236 ap->flag |= ALIASINUSE;
9246 * To handle the "." command, a stack of input files is used. Pushfile
9247 * adds a new entry to the stack and popfile restores the previous level.
9252 struct parsefile *pf;
9254 g_parsefile->nleft = parsenleft;
9255 g_parsefile->lleft = parselleft;
9256 g_parsefile->nextc = parsenextc;
9257 g_parsefile->linno = plinno;
9258 pf = ckzalloc(sizeof(*pf));
9259 pf->prev = g_parsefile;
9261 /*pf->strpush = NULL; - ckzalloc did it */
9262 /*pf->basestrpush.prev = NULL;*/
9269 struct parsefile *pf = g_parsefile;
9277 g_parsefile = pf->prev;
9279 parsenleft = g_parsefile->nleft;
9280 parselleft = g_parsefile->lleft;
9281 parsenextc = g_parsefile->nextc;
9282 plinno = g_parsefile->linno;
9287 * Return to top level.
9292 while (g_parsefile != &basepf)
9297 * Close the file(s) that the shell is reading commands from. Called
9298 * after a fork is done.
9304 if (g_parsefile->fd > 0) {
9305 close(g_parsefile->fd);
9306 g_parsefile->fd = 0;
9311 * Like setinputfile, but takes an open file descriptor. Call this with
9315 setinputfd(int fd, int push)
9317 close_on_exec_on(fd);
9320 g_parsefile->buf = 0;
9322 g_parsefile->fd = fd;
9323 if (g_parsefile->buf == NULL)
9324 g_parsefile->buf = ckmalloc(IBUFSIZ);
9325 parselleft = parsenleft = 0;
9330 * Set the input to take input from a file. If push is set, push the
9331 * old input onto the stack first.
9334 setinputfile(const char *fname, int flags)
9340 fd = open(fname, O_RDONLY);
9342 if (flags & INPUT_NOFILE_OK)
9344 ash_msg_and_raise_error("can't open %s", fname);
9347 fd2 = copyfd(fd, 10);
9350 ash_msg_and_raise_error("out of file descriptors");
9353 setinputfd(fd, flags & INPUT_PUSH_FILE);
9360 * Like setinputfile, but takes input from a string.
9363 setinputstring(char *string)
9367 parsenextc = string;
9368 parsenleft = strlen(string);
9369 g_parsefile->buf = NULL;
9375 /* ============ mail.c
9377 * Routines to check for mail.
9382 #define MAXMBOXES 10
9384 /* times of mailboxes */
9385 static time_t mailtime[MAXMBOXES];
9386 /* Set if MAIL or MAILPATH is changed. */
9387 static smallint mail_var_path_changed;
9390 * Print appropriate message(s) if mail has arrived.
9391 * If mail_var_path_changed is set,
9392 * then the value of MAIL has mail_var_path_changed,
9393 * so we just update the values.
9402 struct stackmark smark;
9405 setstackmark(&smark);
9406 mpath = mpathset() ? mpathval() : mailval();
9407 for (mtp = mailtime; mtp < mailtime + MAXMBOXES; mtp++) {
9408 p = padvance(&mpath, nullstr);
9413 for (q = p; *q; q++)
9419 q[-1] = '\0'; /* delete trailing '/' */
9420 if (stat(p, &statb) < 0) {
9424 if (!mail_var_path_changed && statb.st_mtime != *mtp) {
9427 pathopt ? pathopt : "you have mail"
9430 *mtp = statb.st_mtime;
9432 mail_var_path_changed = 0;
9433 popstackmark(&smark);
9437 changemail(const char *val UNUSED_PARAM)
9439 mail_var_path_changed = 1;
9442 #endif /* ASH_MAIL */
9445 /* ============ ??? */
9448 * Set the shell parameters.
9451 setparam(char **argv)
9457 for (nparam = 0; argv[nparam]; nparam++)
9459 ap = newparam = ckmalloc((nparam + 1) * sizeof(*ap));
9461 *ap++ = ckstrdup(*argv++);
9464 freeparam(&shellparam);
9465 shellparam.malloced = 1;
9466 shellparam.nparam = nparam;
9467 shellparam.p = newparam;
9468 #if ENABLE_ASH_GETOPTS
9469 shellparam.optind = 1;
9470 shellparam.optoff = -1;
9475 * Process shell options. The global variable argptr contains a pointer
9476 * to the argument list; we advance it past the options.
9478 * SUSv3 section 2.8.1 "Consequences of Shell Errors" says:
9479 * For a non-interactive shell, an error condition encountered
9480 * by a special built-in ... shall cause the shell to write a diagnostic message
9481 * to standard error and exit as shown in the following table:
9482 * Error Special Built-In
9484 * Utility syntax error (option or operand error) Shall exit
9486 * However, in bug 1142 (http://busybox.net/bugs/view.php?id=1142)
9487 * we see that bash does not do that (set "finishes" with error code 1 instead,
9488 * and shell continues), and people rely on this behavior!
9490 * set -o barfoo 2>/dev/null
9493 * Oh well. Let's mimic that.
9496 plus_minus_o(char *name, int val)
9501 for (i = 0; i < NOPTS; i++) {
9502 if (strcmp(name, optnames(i)) == 0) {
9507 ash_msg("illegal option %co %s", val ? '-' : '+', name);
9510 for (i = 0; i < NOPTS; i++) {
9512 out1fmt("%-16s%s\n", optnames(i), optlist[i] ? "on" : "off");
9514 out1fmt("set %co %s\n", optlist[i] ? '-' : '+', optnames(i));
9520 setoption(int flag, int val)
9524 for (i = 0; i < NOPTS; i++) {
9525 if (optletters(i) == flag) {
9530 ash_msg_and_raise_error("illegal option %c%c", val ? '-' : '+', flag);
9534 options(int cmdline)
9542 while ((p = *argptr) != NULL) {
9544 if (c != '-' && c != '+')
9547 val = 0; /* val = 0 if c == '+' */
9550 if (p[0] == '\0' || LONE_DASH(p)) {
9552 /* "-" means turn off -x and -v */
9555 /* "--" means reset params */
9556 else if (*argptr == NULL)
9559 break; /* "-" or "--" terminates options */
9562 /* first char was + or - */
9563 while ((c = *p++) != '\0') {
9564 /* bash 3.2 indeed handles -c CMD and +c CMD the same */
9565 if (c == 'c' && cmdline) {
9566 minusc = p; /* command is after shell args */
9567 } else if (c == 'o') {
9568 if (plus_minus_o(*argptr, val)) {
9569 /* it already printed err message */
9570 return 1; /* error */
9574 } else if (cmdline && (c == 'l')) { /* -l or +l == --login */
9576 /* bash does not accept +-login, we also won't */
9577 } else if (cmdline && val && (c == '-')) { /* long options */
9578 if (strcmp(p, "login") == 0)
9590 * The shift builtin command.
9593 shiftcmd(int argc UNUSED_PARAM, char **argv)
9600 n = number(argv[1]);
9601 if (n > shellparam.nparam)
9602 n = shellparam.nparam;
9604 shellparam.nparam -= n;
9605 for (ap1 = shellparam.p; --n >= 0; ap1++) {
9606 if (shellparam.malloced)
9610 while ((*ap2++ = *ap1++) != NULL)
9612 #if ENABLE_ASH_GETOPTS
9613 shellparam.optind = 1;
9614 shellparam.optoff = -1;
9621 * POSIX requires that 'set' (but not export or readonly) output the
9622 * variables in lexicographic order - by the locale's collating order (sigh).
9623 * Maybe we could keep them in an ordered balanced binary tree
9624 * instead of hashed lists.
9625 * For now just roll 'em through qsort for printing...
9628 showvars(const char *sep_prefix, int on, int off)
9633 ep = listvars(on, off, &epend);
9634 qsort(ep, epend - ep, sizeof(char *), vpcmp);
9636 sep = *sep_prefix ? " " : sep_prefix;
9638 for (; ep < epend; ep++) {
9642 p = strchrnul(*ep, '=');
9645 q = single_quote(++p);
9646 out1fmt("%s%s%.*s%s\n", sep_prefix, sep, (int)(p - *ep), *ep, q);
9652 * The set command builtin.
9655 setcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
9660 return showvars(nullstr, 0, VUNSET);
9663 if (!options(0)) { /* if no parse error... */
9666 if (*argptr != NULL) {
9674 #if ENABLE_ASH_RANDOM_SUPPORT
9676 change_random(const char *value)
9678 /* Galois LFSR parameter */
9679 /* Taps at 32 31 29 1: */
9680 enum { MASK = 0x8000000b };
9681 /* Another example - taps at 32 31 30 10: */
9682 /* MASK = 0x00400007 */
9684 if (value == NULL) {
9685 /* "get", generate */
9688 /* LCG has period of 2^32 and alternating lowest bit */
9689 random_LCG = 1664525 * random_LCG + 1013904223;
9690 /* Galois LFSR has period of 2^32-1 = 3 * 5 * 17 * 257 * 65537 */
9691 t = (random_galois_LFSR << 1);
9692 if (random_galois_LFSR < 0) /* if we just shifted 1 out of msb... */
9694 random_galois_LFSR = t;
9695 /* Both are weak, combining them gives better randomness
9696 * and ~2^64 period. & 0x7fff is probably bash compat
9697 * for $RANDOM range. Combining with subtraction is
9698 * just for fun. + and ^ would work equally well. */
9699 t = (t - random_LCG) & 0x7fff;
9700 /* set without recursion */
9701 setvar(vrandom.text, utoa(t), VNOFUNC);
9702 vrandom.flags &= ~VNOFUNC;
9705 random_galois_LFSR = random_LCG = strtoul(value, (char **)NULL, 10);
9710 #if ENABLE_ASH_GETOPTS
9712 getopts(char *optstr, char *optvar, char **optfirst, int *param_optind, int *optoff)
9721 if (*param_optind < 1)
9723 optnext = optfirst + *param_optind - 1;
9725 if (*param_optind <= 1 || *optoff < 0 || (int)strlen(optnext[-1]) < *optoff)
9728 p = optnext[-1] + *optoff;
9729 if (p == NULL || *p == '\0') {
9730 /* Current word is done, advance */
9732 if (p == NULL || *p != '-' || *++p == '\0') {
9739 if (LONE_DASH(p)) /* check for "--" */
9744 for (q = optstr; *q != c;) {
9746 if (optstr[0] == ':') {
9749 err |= setvarsafe("OPTARG", s, 0);
9751 fprintf(stderr, "Illegal option -%c\n", c);
9762 if (*p == '\0' && (p = *optnext) == NULL) {
9763 if (optstr[0] == ':') {
9766 err |= setvarsafe("OPTARG", s, 0);
9769 fprintf(stderr, "No arg for -%c option\n", c);
9778 err |= setvarsafe("OPTARG", p, 0);
9781 err |= setvarsafe("OPTARG", nullstr, 0);
9783 *optoff = p ? p - *(optnext - 1) : -1;
9784 *param_optind = optnext - optfirst + 1;
9785 fmtstr(s, sizeof(s), "%d", *param_optind);
9786 err |= setvarsafe("OPTIND", s, VNOFUNC);
9789 err |= setvarsafe(optvar, s, 0);
9793 flush_stdout_stderr();
9794 raise_exception(EXERROR);
9800 * The getopts builtin. Shellparam.optnext points to the next argument
9801 * to be processed. Shellparam.optptr points to the next character to
9802 * be processed in the current argument. If shellparam.optnext is NULL,
9803 * then it's the first time getopts has been called.
9806 getoptscmd(int argc, char **argv)
9811 ash_msg_and_raise_error("usage: getopts optstring var [arg]");
9813 optbase = shellparam.p;
9814 if (shellparam.optind > shellparam.nparam + 1) {
9815 shellparam.optind = 1;
9816 shellparam.optoff = -1;
9820 if (shellparam.optind > argc - 2) {
9821 shellparam.optind = 1;
9822 shellparam.optoff = -1;
9826 return getopts(argv[1], argv[2], optbase, &shellparam.optind,
9827 &shellparam.optoff);
9829 #endif /* ASH_GETOPTS */
9832 /* ============ Shell parser */
9835 struct heredoc *next; /* next here document in list */
9836 union node *here; /* redirection node */
9837 char *eofmark; /* string indicating end of input */
9838 smallint striptabs; /* if set, strip leading tabs */
9841 static smallint tokpushback; /* last token pushed back */
9842 static smallint parsebackquote; /* nonzero if we are inside backquotes */
9843 static smallint quoteflag; /* set if (part of) last token was quoted */
9844 static token_id_t lasttoken; /* last token read (integer id Txxx) */
9845 static struct heredoc *heredoclist; /* list of here documents to read */
9846 static char *wordtext; /* text of last word returned by readtoken */
9847 static struct nodelist *backquotelist;
9848 static union node *redirnode;
9849 static struct heredoc *heredoc;
9851 * NEOF is returned by parsecmd when it encounters an end of file. It
9852 * must be distinct from NULL, so we use the address of a variable that
9853 * happens to be handy.
9855 #define NEOF ((union node *)&tokpushback)
9857 static void raise_error_syntax(const char *) NORETURN;
9859 raise_error_syntax(const char *msg)
9861 ash_msg_and_raise_error("syntax error: %s", msg);
9866 * Called when an unexpected token is read during the parse. The argument
9867 * is the token that is expected, or -1 if more than one type of token can
9868 * occur at this point.
9870 static void raise_error_unexpected_syntax(int) NORETURN;
9872 raise_error_unexpected_syntax(int token)
9877 l = sprintf(msg, "%s unexpected", tokname(lasttoken));
9879 sprintf(msg + l, " (expecting %s)", tokname(token));
9880 raise_error_syntax(msg);
9884 #define EOFMARKLEN 79
9886 /* parsing is heavily cross-recursive, need these forward decls */
9887 static union node *andor(void);
9888 static union node *pipeline(void);
9889 static union node *parse_command(void);
9890 static void parseheredoc(void);
9891 static char peektoken(void);
9892 static int readtoken(void);
9897 union node *n1, *n2, *n3;
9900 checkkwd = CHKNL | CHKKWD | CHKALIAS;
9901 if (nlflag == 2 && peektoken())
9907 if (tok == TBACKGND) {
9908 if (n2->type == NPIPE) {
9909 n2->npipe.pipe_backgnd = 1;
9911 if (n2->type != NREDIR) {
9912 n3 = stzalloc(sizeof(struct nredir));
9914 /*n3->nredir.redirect = NULL; - stzalloc did it */
9917 n2->type = NBACKGND;
9923 n3 = stzalloc(sizeof(struct nbinary));
9925 n3->nbinary.ch1 = n1;
9926 n3->nbinary.ch2 = n2;
9942 checkkwd = CHKNL | CHKKWD | CHKALIAS;
9950 pungetc(); /* push back EOF on input */
9954 raise_error_unexpected_syntax(-1);
9964 union node *n1, *n2, *n3;
9972 } else if (t == TOR) {
9978 checkkwd = CHKNL | CHKKWD | CHKALIAS;
9980 n3 = stzalloc(sizeof(struct nbinary));
9982 n3->nbinary.ch1 = n1;
9983 n3->nbinary.ch2 = n2;
9991 union node *n1, *n2, *pipenode;
9992 struct nodelist *lp, *prev;
9996 TRACE(("pipeline: entered\n"));
9997 if (readtoken() == TNOT) {
9999 checkkwd = CHKKWD | CHKALIAS;
10002 n1 = parse_command();
10003 if (readtoken() == TPIPE) {
10004 pipenode = stzalloc(sizeof(struct npipe));
10005 pipenode->type = NPIPE;
10006 /*pipenode->npipe.pipe_backgnd = 0; - stzalloc did it */
10007 lp = stzalloc(sizeof(struct nodelist));
10008 pipenode->npipe.cmdlist = lp;
10012 lp = stzalloc(sizeof(struct nodelist));
10013 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10014 lp->n = parse_command();
10016 } while (readtoken() == TPIPE);
10022 n2 = stzalloc(sizeof(struct nnot));
10030 static union node *
10035 n = stzalloc(sizeof(struct narg));
10037 /*n->narg.next = NULL; - stzalloc did it */
10038 n->narg.text = wordtext;
10039 n->narg.backquote = backquotelist;
10044 fixredir(union node *n, const char *text, int err)
10048 TRACE(("Fix redir %s %d\n", text, err));
10050 n->ndup.vname = NULL;
10052 fd = bb_strtou(text, NULL, 10);
10053 if (!errno && fd >= 0)
10054 n->ndup.dupfd = fd;
10055 else if (LONE_DASH(text))
10056 n->ndup.dupfd = -1;
10059 raise_error_syntax("Bad fd number");
10060 n->ndup.vname = makename();
10065 * Returns true if the text contains nothing to expand (no dollar signs
10069 noexpand(char *text)
10075 while ((c = *p++) != '\0') {
10076 if (c == CTLQUOTEMARK)
10080 else if (SIT(c, BASESYNTAX) == CCTL)
10089 union node *n = redirnode;
10091 if (readtoken() != TWORD)
10092 raise_error_unexpected_syntax(-1);
10093 if (n->type == NHERE) {
10094 struct heredoc *here = heredoc;
10098 if (quoteflag == 0)
10100 TRACE(("Here document %d\n", n->type));
10101 if (!noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN)
10102 raise_error_syntax("Illegal eof marker for << redirection");
10103 rmescapes(wordtext);
10104 here->eofmark = wordtext;
10106 if (heredoclist == NULL)
10107 heredoclist = here;
10109 for (p = heredoclist; p->next; p = p->next)
10113 } else if (n->type == NTOFD || n->type == NFROMFD) {
10114 fixredir(n, wordtext, 0);
10116 n->nfile.fname = makename();
10120 static union node *
10123 union node *args, **app;
10124 union node *n = NULL;
10125 union node *vars, **vpp;
10126 union node **rpp, *redir;
10128 #if ENABLE_ASH_BASH_COMPAT
10129 smallint double_brackets_flag = 0;
10139 savecheckkwd = CHKALIAS;
10142 checkkwd = savecheckkwd;
10145 #if ENABLE_ASH_BASH_COMPAT
10146 case TAND: /* "&&" */
10147 case TOR: /* "||" */
10148 if (!double_brackets_flag) {
10152 wordtext = (char *) (t == TAND ? "-a" : "-o");
10155 n = stzalloc(sizeof(struct narg));
10157 /*n->narg.next = NULL; - stzalloc did it */
10158 n->narg.text = wordtext;
10159 #if ENABLE_ASH_BASH_COMPAT
10160 if (strcmp("[[", wordtext) == 0)
10161 double_brackets_flag = 1;
10162 else if (strcmp("]]", wordtext) == 0)
10163 double_brackets_flag = 0;
10165 n->narg.backquote = backquotelist;
10166 if (savecheckkwd && isassignment(wordtext)) {
10168 vpp = &n->narg.next;
10171 app = &n->narg.next;
10176 *rpp = n = redirnode;
10177 rpp = &n->nfile.next;
10178 parsefname(); /* read name of redirection file */
10181 if (args && app == &args->narg.next
10184 struct builtincmd *bcmd;
10187 /* We have a function */
10188 if (readtoken() != TRP)
10189 raise_error_unexpected_syntax(TRP);
10190 name = n->narg.text;
10191 if (!goodname(name)
10192 || ((bcmd = find_builtin(name)) && IS_BUILTIN_SPECIAL(bcmd))
10194 raise_error_syntax("Bad function name");
10197 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10198 n->narg.next = parse_command();
10211 n = stzalloc(sizeof(struct ncmd));
10213 n->ncmd.args = args;
10214 n->ncmd.assign = vars;
10215 n->ncmd.redirect = redir;
10219 static union node *
10220 parse_command(void)
10222 union node *n1, *n2;
10223 union node *ap, **app;
10224 union node *cp, **cpp;
10225 union node *redir, **rpp;
10232 switch (readtoken()) {
10234 raise_error_unexpected_syntax(-1);
10237 n1 = stzalloc(sizeof(struct nif));
10239 n1->nif.test = list(0);
10240 if (readtoken() != TTHEN)
10241 raise_error_unexpected_syntax(TTHEN);
10242 n1->nif.ifpart = list(0);
10244 while (readtoken() == TELIF) {
10245 n2->nif.elsepart = stzalloc(sizeof(struct nif));
10246 n2 = n2->nif.elsepart;
10248 n2->nif.test = list(0);
10249 if (readtoken() != TTHEN)
10250 raise_error_unexpected_syntax(TTHEN);
10251 n2->nif.ifpart = list(0);
10253 if (lasttoken == TELSE)
10254 n2->nif.elsepart = list(0);
10256 n2->nif.elsepart = NULL;
10264 n1 = stzalloc(sizeof(struct nbinary));
10265 n1->type = (lasttoken == TWHILE) ? NWHILE : NUNTIL;
10266 n1->nbinary.ch1 = list(0);
10269 TRACE(("expecting DO got %s %s\n", tokname(got),
10270 got == TWORD ? wordtext : ""));
10271 raise_error_unexpected_syntax(TDO);
10273 n1->nbinary.ch2 = list(0);
10278 if (readtoken() != TWORD || quoteflag || !goodname(wordtext))
10279 raise_error_syntax("Bad for loop variable");
10280 n1 = stzalloc(sizeof(struct nfor));
10282 n1->nfor.var = wordtext;
10283 checkkwd = CHKKWD | CHKALIAS;
10284 if (readtoken() == TIN) {
10286 while (readtoken() == TWORD) {
10287 n2 = stzalloc(sizeof(struct narg));
10289 /*n2->narg.next = NULL; - stzalloc did it */
10290 n2->narg.text = wordtext;
10291 n2->narg.backquote = backquotelist;
10293 app = &n2->narg.next;
10296 n1->nfor.args = ap;
10297 if (lasttoken != TNL && lasttoken != TSEMI)
10298 raise_error_unexpected_syntax(-1);
10300 n2 = stzalloc(sizeof(struct narg));
10302 /*n2->narg.next = NULL; - stzalloc did it */
10303 n2->narg.text = (char *)dolatstr;
10304 /*n2->narg.backquote = NULL;*/
10305 n1->nfor.args = n2;
10307 * Newline or semicolon here is optional (but note
10308 * that the original Bourne shell only allowed NL).
10310 if (lasttoken != TNL && lasttoken != TSEMI)
10313 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10314 if (readtoken() != TDO)
10315 raise_error_unexpected_syntax(TDO);
10316 n1->nfor.body = list(0);
10320 n1 = stzalloc(sizeof(struct ncase));
10322 if (readtoken() != TWORD)
10323 raise_error_unexpected_syntax(TWORD);
10324 n1->ncase.expr = n2 = stzalloc(sizeof(struct narg));
10326 /*n2->narg.next = NULL; - stzalloc did it */
10327 n2->narg.text = wordtext;
10328 n2->narg.backquote = backquotelist;
10330 checkkwd = CHKKWD | CHKALIAS;
10331 } while (readtoken() == TNL);
10332 if (lasttoken != TIN)
10333 raise_error_unexpected_syntax(TIN);
10334 cpp = &n1->ncase.cases;
10336 checkkwd = CHKNL | CHKKWD;
10338 while (t != TESAC) {
10339 if (lasttoken == TLP)
10341 *cpp = cp = stzalloc(sizeof(struct nclist));
10343 app = &cp->nclist.pattern;
10345 *app = ap = stzalloc(sizeof(struct narg));
10347 /*ap->narg.next = NULL; - stzalloc did it */
10348 ap->narg.text = wordtext;
10349 ap->narg.backquote = backquotelist;
10350 if (readtoken() != TPIPE)
10352 app = &ap->narg.next;
10355 //ap->narg.next = NULL;
10356 if (lasttoken != TRP)
10357 raise_error_unexpected_syntax(TRP);
10358 cp->nclist.body = list(2);
10360 cpp = &cp->nclist.next;
10362 checkkwd = CHKNL | CHKKWD;
10366 raise_error_unexpected_syntax(TENDCASE);
10373 n1 = stzalloc(sizeof(struct nredir));
10374 n1->type = NSUBSHELL;
10375 n1->nredir.n = list(0);
10376 /*n1->nredir.redirect = NULL; - stzalloc did it */
10386 return simplecmd();
10389 if (readtoken() != t)
10390 raise_error_unexpected_syntax(t);
10393 /* Now check for redirection which may follow command */
10394 checkkwd = CHKKWD | CHKALIAS;
10396 while (readtoken() == TREDIR) {
10397 *rpp = n2 = redirnode;
10398 rpp = &n2->nfile.next;
10404 if (n1->type != NSUBSHELL) {
10405 n2 = stzalloc(sizeof(struct nredir));
10410 n1->nredir.redirect = redir;
10415 #if ENABLE_ASH_BASH_COMPAT
10416 static int decode_dollar_squote(void)
10418 static const char C_escapes[] ALIGN1 = "nrbtfav""x\\01234567";
10424 p = strchr(C_escapes, c);
10429 if ((unsigned char)(c - '0') <= 7) { /* \ooo */
10433 } while ((unsigned char)(c - '0') <= 7 && --cnt);
10435 } else if (c == 'x') { /* \xHH */
10439 } while (isxdigit(c) && --cnt);
10441 if (cnt == 3) { /* \x but next char is "bad" */
10445 } else { /* simple seq like \\ or \t */
10450 c = bb_process_escape_sequence((void*)&p);
10451 } else { /* unrecognized "\z": print both chars unless ' or " */
10452 if (c != '\'' && c != '"') {
10454 c |= 0x100; /* "please encode \, then me" */
10462 * If eofmark is NULL, read a word or a redirection symbol. If eofmark
10463 * is not NULL, read a here document. In the latter case, eofmark is the
10464 * word which marks the end of the document and striptabs is true if
10465 * leading tabs should be stripped from the document. The argument firstc
10466 * is the first character of the input token or document.
10468 * Because C does not have internal subroutines, I have simulated them
10469 * using goto's to implement the subroutine linkage. The following macros
10470 * will run code that appears at the end of readtoken1.
10472 #define CHECKEND() {goto checkend; checkend_return:;}
10473 #define PARSEREDIR() {goto parseredir; parseredir_return:;}
10474 #define PARSESUB() {goto parsesub; parsesub_return:;}
10475 #define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;}
10476 #define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;}
10477 #define PARSEARITH() {goto parsearith; parsearith_return:;}
10479 readtoken1(int firstc, int syntax, char *eofmark, int striptabs)
10481 /* NB: syntax parameter fits into smallint */
10485 char line[EOFMARKLEN + 1];
10486 struct nodelist *bqlist;
10490 smallint prevsyntax; /* syntax before arithmetic */
10491 #if ENABLE_ASH_EXPAND_PRMT
10492 smallint pssyntax; /* we are expanding a prompt string */
10494 int varnest; /* levels of variables expansion */
10495 int arinest; /* levels of arithmetic expansion */
10496 int parenlevel; /* levels of parens in arithmetic */
10497 int dqvarnest; /* levels of variables expansion within double quotes */
10499 USE_ASH_BASH_COMPAT(smallint bash_dollar_squote = 0;)
10502 /* Avoid longjmp clobbering */
10508 (void) &parenlevel;
10511 (void) &prevsyntax;
10514 startlinno = plinno;
10519 #if ENABLE_ASH_EXPAND_PRMT
10520 pssyntax = (syntax == PSSYNTAX);
10524 dblquote = (syntax == DQSYNTAX);
10530 STARTSTACKSTR(out);
10531 loop: { /* for each line, until end of word */
10532 CHECKEND(); /* set c to PEOF if at end of here document */
10533 for (;;) { /* until end of line or end of word */
10534 CHECKSTRSPACE(4, out); /* permit 4 calls to USTPUTC */
10535 switch (SIT(c, syntax)) {
10536 case CNL: /* '\n' */
10537 if (syntax == BASESYNTAX)
10538 goto endword; /* exit outer loop */
10544 goto loop; /* continue outer loop */
10549 if (eofmark == NULL || dblquote)
10550 USTPUTC(CTLESC, out);
10551 #if ENABLE_ASH_BASH_COMPAT
10552 if (c == '\\' && bash_dollar_squote) {
10553 c = decode_dollar_squote();
10555 USTPUTC('\\', out);
10556 c = (unsigned char)c;
10562 case CBACK: /* backslash */
10565 USTPUTC(CTLESC, out);
10566 USTPUTC('\\', out);
10568 } else if (c == '\n') {
10572 #if ENABLE_ASH_EXPAND_PRMT
10573 if (c == '$' && pssyntax) {
10574 USTPUTC(CTLESC, out);
10575 USTPUTC('\\', out);
10578 if (dblquote && c != '\\'
10579 && c != '`' && c != '$'
10580 && (c != '"' || eofmark != NULL)
10582 USTPUTC(CTLESC, out);
10583 USTPUTC('\\', out);
10585 if (SIT(c, SQSYNTAX) == CCTL)
10586 USTPUTC(CTLESC, out);
10594 if (eofmark == NULL) {
10595 USTPUTC(CTLQUOTEMARK, out);
10603 USE_ASH_BASH_COMPAT(bash_dollar_squote = 0;)
10604 if (eofmark != NULL && arinest == 0
10609 if (dqvarnest == 0) {
10610 syntax = BASESYNTAX;
10617 case CVAR: /* '$' */
10618 PARSESUB(); /* parse substitution */
10620 case CENDVAR: /* '}' */
10623 if (dqvarnest > 0) {
10626 USTPUTC(CTLENDVAR, out);
10631 #if ENABLE_ASH_MATH_SUPPORT
10632 case CLP: /* '(' in arithmetic */
10636 case CRP: /* ')' in arithmetic */
10637 if (parenlevel > 0) {
10641 if (pgetc() == ')') {
10642 if (--arinest == 0) {
10643 USTPUTC(CTLENDARI, out);
10644 syntax = prevsyntax;
10645 dblquote = (syntax == DQSYNTAX);
10650 * unbalanced parens
10651 * (don't 2nd guess - no error)
10659 case CBQUOTE: /* '`' */
10663 goto endword; /* exit outer loop */
10668 goto endword; /* exit outer loop */
10669 #if ENABLE_ASH_ALIAS
10679 #if ENABLE_ASH_MATH_SUPPORT
10680 if (syntax == ARISYNTAX)
10681 raise_error_syntax("Missing '))'");
10683 if (syntax != BASESYNTAX && !parsebackquote && eofmark == NULL)
10684 raise_error_syntax("Unterminated quoted string");
10685 if (varnest != 0) {
10686 startlinno = plinno;
10688 raise_error_syntax("Missing '}'");
10690 USTPUTC('\0', out);
10691 len = out - (char *)stackblock();
10692 out = stackblock();
10693 if (eofmark == NULL) {
10694 if ((c == '>' || c == '<')
10696 // && len <= 2 // THIS LIMITS fd to 1 char: N>file, but no NN>file!
10697 // && (*out == '\0' || isdigit(*out))
10699 int maxlen = 9 + 1; /* max 9 digit fd#: 999999999 */
10701 while (--maxlen && isdigit(*np))
10704 PARSEREDIR(); /* passed as params: out, c */
10705 lasttoken = TREDIR;
10708 /* else: non-number X seen, interpret it
10709 * as "NNNX>file" = "NNNX >file" */
10713 quoteflag = quotef;
10714 backquotelist = bqlist;
10715 grabstackblock(len);
10719 /* end of readtoken routine */
10722 * Check to see whether we are at the end of the here document. When this
10723 * is called, c is set to the first character of the next input line. If
10724 * we are at the end of the here document, this routine sets the c to PEOF.
10728 #if ENABLE_ASH_ALIAS
10734 while (c == '\t') {
10738 if (c == *eofmark) {
10739 if (pfgets(line, sizeof(line)) != NULL) {
10743 for (q = eofmark + 1; *q && *p == *q; p++, q++)
10745 if (*p == '\n' && *q == '\0') {
10748 needprompt = doprompt;
10750 pushstring(line, NULL);
10755 goto checkend_return;
10759 * Parse a redirection operator. The variable "out" points to a string
10760 * specifying the fd to be redirected. The variable "c" contains the
10761 * first character of the redirection operator.
10764 /* out is already checked to be a valid number or "" */
10765 int fd = (*out == '\0' ? -1 : atoi(out));
10768 np = stzalloc(sizeof(struct nfile));
10773 np->type = NAPPEND;
10775 np->type = NCLOBBER;
10782 } else { /* c == '<' */
10783 /*np->nfile.fd = 0; - stzalloc did it */
10787 if (sizeof(struct nfile) != sizeof(struct nhere)) {
10788 np = stzalloc(sizeof(struct nhere));
10789 /*np->nfile.fd = 0; - stzalloc did it */
10792 heredoc = stzalloc(sizeof(struct heredoc));
10793 heredoc->here = np;
10796 heredoc->striptabs = 1;
10798 /*heredoc->striptabs = 0; - stzalloc did it */
10804 np->type = NFROMFD;
10808 np->type = NFROMTO;
10820 goto parseredir_return;
10824 * Parse a substitution. At this point, we have read the dollar sign
10825 * and nothing else.
10828 /* is_special(c) evaluates to 1 for c in "!#$*-0123456789?@"; 0 otherwise
10829 * (assuming ascii char codes, as the original implementation did) */
10830 #define is_special(c) \
10831 (((unsigned)(c) - 33 < 32) \
10832 && ((0xc1ff920dU >> ((unsigned)(c) - 33)) & 1))
10838 static const char types[] ALIGN1 = "}-+?=";
10841 if (c <= PEOA_OR_PEOF
10842 || (c != '(' && c != '{' && !is_name(c) && !is_special(c))
10844 #if ENABLE_ASH_BASH_COMPAT
10846 bash_dollar_squote = 1;
10851 } else if (c == '(') { /* $(command) or $((arith)) */
10852 if (pgetc() == '(') {
10853 #if ENABLE_ASH_MATH_SUPPORT
10856 raise_error_syntax("you disabled math support for $((arith)) syntax");
10863 USTPUTC(CTLVAR, out);
10864 typeloc = out - (char *)stackblock();
10865 USTPUTC(VSNORMAL, out);
10866 subtype = VSNORMAL;
10874 subtype = VSLENGTH;
10878 if (c > PEOA_OR_PEOF && is_name(c)) {
10882 } while (c > PEOA_OR_PEOF && is_in_name(c));
10883 } else if (isdigit(c)) {
10887 } while (isdigit(c));
10888 } else if (is_special(c)) {
10892 badsub: raise_error_syntax("Bad substitution");
10896 if (subtype == 0) {
10900 #if ENABLE_ASH_BASH_COMPAT
10901 if (c == ':' || c == '$' || isdigit(c)) {
10903 subtype = VSSUBSTR;
10910 p = strchr(types, c);
10913 subtype = p - types + VSNORMAL;
10918 subtype = c == '#' ? VSTRIMLEFT : VSTRIMRIGHT;
10926 #if ENABLE_ASH_BASH_COMPAT
10928 subtype = VSREPLACE;
10931 subtype++; /* VSREPLACEALL */
10940 if (dblquote || arinest)
10942 *((char *)stackblock() + typeloc) = subtype | flags;
10943 if (subtype != VSNORMAL) {
10945 if (dblquote || arinest) {
10950 goto parsesub_return;
10954 * Called to parse command substitutions. Newstyle is set if the command
10955 * is enclosed inside $(...); nlpp is a pointer to the head of the linked
10956 * list of commands (passed by reference), and savelen is the number of
10957 * characters on the top of the stack which must be preserved.
10960 struct nodelist **nlpp;
10963 char *volatile str;
10964 struct jmploc jmploc;
10965 struct jmploc *volatile savehandler;
10967 smallint saveprompt = 0;
10970 (void) &saveprompt;
10972 savepbq = parsebackquote;
10973 if (setjmp(jmploc.loc)) {
10975 parsebackquote = 0;
10976 exception_handler = savehandler;
10977 longjmp(exception_handler->loc, 1);
10981 savelen = out - (char *)stackblock();
10983 str = ckmalloc(savelen);
10984 memcpy(str, stackblock(), savelen);
10986 savehandler = exception_handler;
10987 exception_handler = &jmploc;
10990 /* We must read until the closing backquote, giving special
10991 treatment to some slashes, and then push the string and
10992 reread it as input, interpreting it normally. */
10999 STARTSTACKSTR(pout);
11016 * If eating a newline, avoid putting
11017 * the newline into the new character
11018 * stream (via the STPUTC after the
11023 if (pc != '\\' && pc != '`' && pc != '$'
11024 && (!dblquote || pc != '"'))
11025 STPUTC('\\', pout);
11026 if (pc > PEOA_OR_PEOF) {
11032 #if ENABLE_ASH_ALIAS
11035 startlinno = plinno;
11036 raise_error_syntax("EOF in backquote substitution");
11040 needprompt = doprompt;
11049 STPUTC('\0', pout);
11050 psavelen = pout - (char *)stackblock();
11051 if (psavelen > 0) {
11052 pstr = grabstackstr(pout);
11053 setinputstring(pstr);
11058 nlpp = &(*nlpp)->next;
11059 *nlpp = stzalloc(sizeof(**nlpp));
11060 /* (*nlpp)->next = NULL; - stzalloc did it */
11061 parsebackquote = oldstyle;
11064 saveprompt = doprompt;
11071 doprompt = saveprompt;
11072 else if (readtoken() != TRP)
11073 raise_error_unexpected_syntax(TRP);
11078 * Start reading from old file again, ignoring any pushed back
11079 * tokens left from the backquote parsing
11084 while (stackblocksize() <= savelen)
11086 STARTSTACKSTR(out);
11088 memcpy(out, str, savelen);
11089 STADJUST(savelen, out);
11095 parsebackquote = savepbq;
11096 exception_handler = savehandler;
11097 if (arinest || dblquote)
11098 USTPUTC(CTLBACKQ | CTLQUOTE, out);
11100 USTPUTC(CTLBACKQ, out);
11102 goto parsebackq_oldreturn;
11103 goto parsebackq_newreturn;
11106 #if ENABLE_ASH_MATH_SUPPORT
11108 * Parse an arithmetic expansion (indicate start of one and set state)
11111 if (++arinest == 1) {
11112 prevsyntax = syntax;
11113 syntax = ARISYNTAX;
11114 USTPUTC(CTLARI, out);
11121 * we collapse embedded arithmetic expansion to
11122 * parenthesis, which should be equivalent
11126 goto parsearith_return;
11130 } /* end of readtoken */
11133 * Read the next input token.
11134 * If the token is a word, we set backquotelist to the list of cmds in
11135 * backquotes. We set quoteflag to true if any part of the word was
11137 * If the token is TREDIR, then we set redirnode to a structure containing
11139 * In all cases, the variable startlinno is set to the number of the line
11140 * on which the token starts.
11142 * [Change comment: here documents and internal procedures]
11143 * [Readtoken shouldn't have any arguments. Perhaps we should make the
11144 * word parsing code into a separate routine. In this case, readtoken
11145 * doesn't need to have any internal procedures, but parseword does.
11146 * We could also make parseoperator in essence the main routine, and
11147 * have parseword (readtoken1?) handle both words and redirection.]
11149 #define NEW_xxreadtoken
11150 #ifdef NEW_xxreadtoken
11151 /* singles must be first! */
11152 static const char xxreadtoken_chars[7] ALIGN1 = {
11153 '\n', '(', ')', '&', '|', ';', 0
11156 static const char xxreadtoken_tokens[] ALIGN1 = {
11157 TNL, TLP, TRP, /* only single occurrence allowed */
11158 TBACKGND, TPIPE, TSEMI, /* if single occurrence */
11159 TEOF, /* corresponds to trailing nul */
11160 TAND, TOR, TENDCASE /* if double occurrence */
11163 #define xxreadtoken_doubles \
11164 (sizeof(xxreadtoken_tokens) - sizeof(xxreadtoken_chars))
11165 #define xxreadtoken_singles \
11166 (sizeof(xxreadtoken_chars) - xxreadtoken_doubles - 1)
11180 startlinno = plinno;
11181 for (;;) { /* until token or start of word found */
11184 if ((c != ' ') && (c != '\t')
11185 #if ENABLE_ASH_ALIAS
11190 while ((c = pgetc()) != '\n' && c != PEOF)
11193 } else if (c == '\\') {
11194 if (pgetc() != '\n') {
11198 startlinno = ++plinno;
11203 = xxreadtoken_chars + sizeof(xxreadtoken_chars) - 1;
11208 needprompt = doprompt;
11211 p = strchr(xxreadtoken_chars, c);
11214 return readtoken1(c, BASESYNTAX, (char *) NULL, 0);
11217 if ((size_t)(p - xxreadtoken_chars) >= xxreadtoken_singles) {
11218 if (pgetc() == *p) { /* double occurrence? */
11219 p += xxreadtoken_doubles + 1;
11225 lasttoken = xxreadtoken_tokens[p - xxreadtoken_chars];
11232 #define RETURN(token) return lasttoken = token
11245 startlinno = plinno;
11246 for (;;) { /* until token or start of word found */
11249 case ' ': case '\t':
11250 #if ENABLE_ASH_ALIAS
11255 while ((c = pgetc()) != '\n' && c != PEOF)
11260 if (pgetc() == '\n') {
11261 startlinno = ++plinno;
11270 needprompt = doprompt;
11275 if (pgetc() == '&')
11280 if (pgetc() == '|')
11285 if (pgetc() == ';')
11298 return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
11301 #endif /* NEW_xxreadtoken */
11308 smallint alreadyseen = tokpushback;
11311 #if ENABLE_ASH_ALIAS
11320 if (checkkwd & CHKNL) {
11327 if (t != TWORD || quoteflag) {
11332 * check for keywords
11334 if (checkkwd & CHKKWD) {
11335 const char *const *pp;
11337 pp = findkwd(wordtext);
11339 lasttoken = t = pp - tokname_array;
11340 TRACE(("keyword %s recognized\n", tokname(t)));
11345 if (checkkwd & CHKALIAS) {
11346 #if ENABLE_ASH_ALIAS
11348 ap = lookupalias(wordtext, 1);
11351 pushstring(ap->val, ap);
11361 TRACE(("token %s %s\n", tokname(t), t == TWORD ? wordtext : ""));
11363 TRACE(("reread token %s %s\n", tokname(t), t == TWORD ? wordtext : ""));
11375 return tokname_array[t][0];
11379 * Read and parse a command. Returns NEOF on end of file. (NULL is a
11380 * valid parse tree indicating a blank line.)
11382 static union node *
11383 parsecmd(int interact)
11388 doprompt = interact;
11390 setprompt(doprompt);
11402 * Input any here documents.
11407 struct heredoc *here;
11410 here = heredoclist;
11411 heredoclist = NULL;
11417 readtoken1(pgetc(), here->here->type == NHERE? SQSYNTAX : DQSYNTAX,
11418 here->eofmark, here->striptabs);
11419 n = stzalloc(sizeof(struct narg));
11420 n->narg.type = NARG;
11421 /*n->narg.next = NULL; - stzalloc did it */
11422 n->narg.text = wordtext;
11423 n->narg.backquote = backquotelist;
11424 here->here->nhere.doc = n;
11431 * called by editline -- any expansions to the prompt should be added here.
11433 #if ENABLE_ASH_EXPAND_PRMT
11434 static const char *
11435 expandstr(const char *ps)
11439 /* XXX Fix (char *) cast. */
11440 setinputstring((char *)ps);
11441 readtoken1(pgetc(), PSSYNTAX, nullstr, 0);
11444 n.narg.type = NARG;
11445 n.narg.next = NULL;
11446 n.narg.text = wordtext;
11447 n.narg.backquote = backquotelist;
11449 expandarg(&n, NULL, 0);
11450 return stackblock();
11455 * Execute a command or commands contained in a string.
11458 evalstring(char *s, int mask)
11461 struct stackmark smark;
11465 setstackmark(&smark);
11468 while ((n = parsecmd(0)) != NEOF) {
11470 popstackmark(&smark);
11483 * The eval command.
11486 evalcmd(int argc UNUSED_PARAM, char **argv)
11495 STARTSTACKSTR(concat);
11497 concat = stack_putstr(p, concat);
11501 STPUTC(' ', concat);
11503 STPUTC('\0', concat);
11504 p = grabstackstr(concat);
11506 evalstring(p, ~SKIPEVAL);
11513 * Read and execute commands. "Top" is nonzero for the top level command
11514 * loop; it turns on prompting if the shell is interactive.
11520 struct stackmark smark;
11524 TRACE(("cmdloop(%d) called\n", top));
11528 setstackmark(&smark);
11531 showjobs(stderr, SHOW_CHANGED);
11534 if (iflag && top) {
11536 #if ENABLE_ASH_MAIL
11540 n = parsecmd(inter);
11541 /* showtree(n); DEBUG */
11543 if (!top || numeof >= 50)
11545 if (!stoppedjobs()) {
11548 out2str("\nUse \"exit\" to leave shell.\n");
11551 } else if (nflag == 0) {
11552 /* job_warning can only be 2,1,0. Here 2->1, 1/0->0 */
11557 popstackmark(&smark);
11562 return skip & SKIPEVAL;
11569 * Take commands from a file. To be compatible we should do a path
11570 * search for the file, which is necessary to find sub-commands.
11573 find_dot_file(char *name)
11576 const char *path = pathval();
11579 /* don't try this for absolute or relative paths */
11580 if (strchr(name, '/'))
11583 while ((fullname = padvance(&path, name)) != NULL) {
11584 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
11586 * Don't bother freeing here, since it will
11587 * be freed by the caller.
11591 stunalloc(fullname);
11594 /* not found in the PATH */
11595 ash_msg_and_raise_error("%s: not found", name);
11600 dotcmd(int argc, char **argv)
11602 struct strlist *sp;
11603 volatile struct shparam saveparam;
11606 for (sp = cmdenviron; sp; sp = sp->next)
11607 setvareq(ckstrdup(sp->text), VSTRFIXED | VTEXTFIXED);
11609 if (argv[1]) { /* That's what SVR2 does */
11610 char *fullname = find_dot_file(argv[1]);
11613 if (argc) { /* argc > 0, argv[0] != NULL */
11614 saveparam = shellparam;
11615 shellparam.malloced = 0;
11616 shellparam.nparam = argc;
11617 shellparam.p = argv;
11620 setinputfile(fullname, INPUT_PUSH_FILE);
11621 commandname = fullname;
11626 freeparam(&shellparam);
11627 shellparam = saveparam;
11629 status = exitstatus;
11635 exitcmd(int argc UNUSED_PARAM, char **argv)
11640 exitstatus = number(argv[1]);
11641 raise_exception(EXEXIT);
11646 * Read a file containing shell functions.
11649 readcmdfile(char *name)
11651 setinputfile(name, INPUT_PUSH_FILE);
11657 /* ============ find_command inplementation */
11660 * Resolve a command name. If you change this routine, you may have to
11661 * change the shellexec routine as well.
11664 find_command(char *name, struct cmdentry *entry, int act, const char *path)
11666 struct tblentry *cmdp;
11673 struct builtincmd *bcmd;
11675 /* If name contains a slash, don't use PATH or hash table */
11676 if (strchr(name, '/') != NULL) {
11677 entry->u.index = -1;
11678 if (act & DO_ABS) {
11679 while (stat(name, &statb) < 0) {
11681 if (errno == EINTR)
11684 entry->cmdtype = CMDUNKNOWN;
11688 entry->cmdtype = CMDNORMAL;
11692 /* #if ENABLE_FEATURE_SH_STANDALONE... moved after builtin check */
11694 updatetbl = (path == pathval());
11697 if (strstr(path, "%builtin") != NULL)
11698 act |= DO_ALTBLTIN;
11701 /* If name is in the table, check answer will be ok */
11702 cmdp = cmdlookup(name, 0);
11703 if (cmdp != NULL) {
11706 switch (cmdp->cmdtype) {
11724 } else if (cmdp->rehash == 0)
11725 /* if not invalidated by cd, we're done */
11729 /* If %builtin not in path, check for builtin next */
11730 bcmd = find_builtin(name);
11732 if (IS_BUILTIN_REGULAR(bcmd))
11733 goto builtin_success;
11734 if (act & DO_ALTPATH) {
11735 if (!(act & DO_ALTBLTIN))
11736 goto builtin_success;
11737 } else if (builtinloc <= 0) {
11738 goto builtin_success;
11742 #if ENABLE_FEATURE_SH_STANDALONE
11744 int applet_no = find_applet_by_name(name);
11745 if (applet_no >= 0) {
11746 entry->cmdtype = CMDNORMAL;
11747 entry->u.index = -2 - applet_no;
11753 /* We have to search path. */
11754 prev = -1; /* where to start */
11755 if (cmdp && cmdp->rehash) { /* doing a rehash */
11756 if (cmdp->cmdtype == CMDBUILTIN)
11759 prev = cmdp->param.index;
11765 while ((fullname = padvance(&path, name)) != NULL) {
11766 stunalloc(fullname);
11767 /* NB: code below will still use fullname
11768 * despite it being "unallocated" */
11771 if (prefix(pathopt, "builtin")) {
11773 goto builtin_success;
11776 if ((act & DO_NOFUNC)
11777 || !prefix(pathopt, "func")
11778 ) { /* ignore unimplemented options */
11782 /* if rehash, don't redo absolute path names */
11783 if (fullname[0] == '/' && idx <= prev) {
11786 TRACE(("searchexec \"%s\": no change\n", name));
11789 while (stat(fullname, &statb) < 0) {
11791 if (errno == EINTR)
11794 if (errno != ENOENT && errno != ENOTDIR)
11798 e = EACCES; /* if we fail, this will be the error */
11799 if (!S_ISREG(statb.st_mode))
11801 if (pathopt) { /* this is a %func directory */
11802 stalloc(strlen(fullname) + 1);
11803 /* NB: stalloc will return space pointed by fullname
11804 * (because we don't have any intervening allocations
11805 * between stunalloc above and this stalloc) */
11806 readcmdfile(fullname);
11807 cmdp = cmdlookup(name, 0);
11808 if (cmdp == NULL || cmdp->cmdtype != CMDFUNCTION)
11809 ash_msg_and_raise_error("%s not defined in %s", name, fullname);
11810 stunalloc(fullname);
11813 TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
11815 entry->cmdtype = CMDNORMAL;
11816 entry->u.index = idx;
11820 cmdp = cmdlookup(name, 1);
11821 cmdp->cmdtype = CMDNORMAL;
11822 cmdp->param.index = idx;
11827 /* We failed. If there was an entry for this command, delete it */
11828 if (cmdp && updatetbl)
11829 delete_cmd_entry();
11831 ash_msg("%s: %s", name, errmsg(e, "not found"));
11832 entry->cmdtype = CMDUNKNOWN;
11837 entry->cmdtype = CMDBUILTIN;
11838 entry->u.cmd = bcmd;
11842 cmdp = cmdlookup(name, 1);
11843 cmdp->cmdtype = CMDBUILTIN;
11844 cmdp->param.cmd = bcmd;
11848 entry->cmdtype = cmdp->cmdtype;
11849 entry->u = cmdp->param;
11853 /* ============ trap.c */
11856 * The trap builtin.
11859 trapcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
11868 for (signo = 0; signo < NSIG; signo++) {
11869 if (trap[signo] != NULL) {
11872 sn = get_signame(signo);
11873 out1fmt("trap -- %s %s\n",
11874 single_quote(trap[signo]), sn);
11884 signo = get_signum(*ap);
11886 ash_msg_and_raise_error("%s: bad trap", *ap);
11889 if (LONE_DASH(action))
11892 action = ckstrdup(action);
11895 trap[signo] = action;
11905 /* ============ Builtins */
11907 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
11909 * Lists available builtins
11912 helpcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
11917 out1fmt("\nBuilt-in commands:\n-------------------\n");
11918 for (col = 0, i = 0; i < ARRAY_SIZE(builtintab); i++) {
11919 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '),
11920 builtintab[i].name + 1);
11926 #if ENABLE_FEATURE_SH_STANDALONE
11928 const char *a = applet_names;
11930 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '), a);
11935 a += strlen(a) + 1;
11940 return EXIT_SUCCESS;
11942 #endif /* FEATURE_SH_EXTRA_QUIET */
11945 * The export and readonly commands.
11948 exportcmd(int argc UNUSED_PARAM, char **argv)
11954 int flag = argv[0][0] == 'r'? VREADONLY : VEXPORT;
11956 if (nextopt("p") != 'p') {
11961 p = strchr(name, '=');
11965 vp = *findvar(hashvar(name), name);
11971 setvar(name, p, flag);
11972 } while ((name = *++aptr) != NULL);
11976 showvars(argv[0], flag, 0);
11981 * Delete a function if it exists.
11984 unsetfunc(const char *name)
11986 struct tblentry *cmdp;
11988 cmdp = cmdlookup(name, 0);
11989 if (cmdp!= NULL && cmdp->cmdtype == CMDFUNCTION)
11990 delete_cmd_entry();
11994 * The unset builtin command. We unset the function before we unset the
11995 * variable to allow a function to be unset when there is a readonly variable
11996 * with the same name.
11999 unsetcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12006 while ((i = nextopt("vf")) != '\0') {
12010 for (ap = argptr; *ap; ap++) {
12026 #include <sys/times.h>
12028 static const unsigned char timescmd_str[] ALIGN1 = {
12029 ' ', offsetof(struct tms, tms_utime),
12030 '\n', offsetof(struct tms, tms_stime),
12031 ' ', offsetof(struct tms, tms_cutime),
12032 '\n', offsetof(struct tms, tms_cstime),
12037 timescmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12039 long clk_tck, s, t;
12040 const unsigned char *p;
12043 clk_tck = sysconf(_SC_CLK_TCK);
12048 t = *(clock_t *)(((char *) &buf) + p[1]);
12050 out1fmt("%ldm%ld.%.3lds%c",
12052 ((t - s * clk_tck) * 1000) / clk_tck,
12054 } while (*(p += 2));
12059 #if ENABLE_ASH_MATH_SUPPORT
12061 dash_arith(const char *s)
12067 result = arith(s, &errcode);
12070 ash_msg_and_raise_error("exponent less than 0");
12072 ash_msg_and_raise_error("divide by zero");
12074 ash_msg_and_raise_error("expression recursion loop detected");
12075 raise_error_syntax(s);
12083 * The let builtin. partial stolen from GNU Bash, the Bourne Again SHell.
12084 * Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
12086 * Copyright (C) 2003 Vladimir Oleynik <dzo@simtreas.ru>
12089 letcmd(int argc UNUSED_PARAM, char **argv)
12095 ash_msg_and_raise_error("expression expected");
12097 i = dash_arith(*argv);
12102 #endif /* ASH_MATH_SUPPORT */
12105 /* ============ miscbltin.c
12107 * Miscellaneous builtins.
12112 #if defined(__GLIBC__) && __GLIBC__ == 2 && __GLIBC_MINOR__ < 1
12113 typedef enum __rlimit_resource rlim_t;
12117 * The read builtin. Options:
12118 * -r Do not interpret '\' specially
12119 * -s Turn off echo (tty only)
12120 * -n NCHARS Read NCHARS max
12121 * -p PROMPT Display PROMPT on stderr (if input is from tty)
12122 * -t SECONDS Timeout after SECONDS (tty or pipe only)
12123 * -u FD Read from given FD instead of fd 0
12124 * This uses unbuffered input, which may be avoidable in some cases.
12125 * TODO: bash also has:
12126 * -a ARRAY Read into array[0],[1],etc
12127 * -d DELIM End on DELIM char, not newline
12128 * -e Use line editing (tty only)
12131 readcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12133 static const char *const arg_REPLY[] = { "REPLY", NULL };
12146 #if ENABLE_ASH_READ_NCHARS
12147 int nchars = 0; /* if != 0, -n is in effect */
12149 struct termios tty, old_tty;
12151 #if ENABLE_ASH_READ_TIMEOUT
12152 unsigned end_ms = 0;
12153 unsigned timeout = 0;
12158 while ((i = nextopt("p:u:r"
12159 USE_ASH_READ_TIMEOUT("t:")
12160 USE_ASH_READ_NCHARS("n:s")
12164 prompt = optionarg;
12166 #if ENABLE_ASH_READ_NCHARS
12168 nchars = bb_strtou(optionarg, NULL, 10);
12169 if (nchars < 0 || errno)
12170 ash_msg_and_raise_error("invalid count");
12171 /* nchars == 0: off (bash 3.2 does this too) */
12177 #if ENABLE_ASH_READ_TIMEOUT
12179 timeout = bb_strtou(optionarg, NULL, 10);
12180 if (errno || timeout > UINT_MAX / 2048)
12181 ash_msg_and_raise_error("invalid timeout");
12183 #if 0 /* even bash have no -t N.NNN support */
12184 ts.tv_sec = bb_strtou(optionarg, &p, 10);
12186 /* EINVAL means number is ok, but not terminated by NUL */
12187 if (*p == '.' && errno == EINVAL) {
12191 ts.tv_usec = bb_strtou(p, &p2, 10);
12193 ash_msg_and_raise_error("invalid timeout");
12195 /* normalize to usec */
12197 ash_msg_and_raise_error("invalid timeout");
12198 while (scale++ < 6)
12201 } else if (ts.tv_sec < 0 || errno) {
12202 ash_msg_and_raise_error("invalid timeout");
12204 if (!(ts.tv_sec | ts.tv_usec)) { /* both are 0? */
12205 ash_msg_and_raise_error("invalid timeout");
12214 fd = bb_strtou(optionarg, NULL, 10);
12215 if (fd < 0 || errno)
12216 ash_msg_and_raise_error("invalid file descriptor");
12222 if (prompt && isatty(fd)) {
12227 ap = (char**)arg_REPLY;
12228 ifs = bltinlookup("IFS");
12231 #if ENABLE_ASH_READ_NCHARS
12232 tcgetattr(fd, &tty);
12234 if (nchars || silent) {
12236 tty.c_lflag &= ~ICANON;
12237 tty.c_cc[VMIN] = nchars < 256 ? nchars : 255;
12240 tty.c_lflag &= ~(ECHO | ECHOK | ECHONL);
12242 /* if tcgetattr failed, tcsetattr will fail too.
12243 * Ignoring, it's harmless. */
12244 tcsetattr(fd, TCSANOW, &tty);
12251 #if ENABLE_ASH_READ_TIMEOUT
12252 if (timeout) /* NB: ensuring end_ms is nonzero */
12253 end_ms = ((unsigned)(monotonic_us() / 1000) + timeout) | 1;
12257 #if ENABLE_ASH_READ_TIMEOUT
12259 struct pollfd pfd[1];
12261 pfd[0].events = POLLIN;
12262 timeout = end_ms - (unsigned)(monotonic_us() / 1000);
12263 if ((int)timeout <= 0 /* already late? */
12264 || safe_poll(pfd, 1, timeout) != 1 /* no? wait... */
12265 ) { /* timed out! */
12266 #if ENABLE_ASH_READ_NCHARS
12267 tcsetattr(fd, TCSANOW, &old_tty);
12273 if (nonblock_safe_read(fd, &c, 1) != 1) {
12285 if (!rflag && c == '\\') {
12291 if (startword && *ifs == ' ' && strchr(ifs, c)) {
12295 if (ap[1] != NULL && strchr(ifs, c) != NULL) {
12297 setvar(*ap, stackblock(), 0);
12306 /* end of do {} while: */
12307 #if ENABLE_ASH_READ_NCHARS
12313 #if ENABLE_ASH_READ_NCHARS
12314 tcsetattr(fd, TCSANOW, &old_tty);
12318 /* Remove trailing blanks */
12319 while ((char *)stackblock() <= --p && strchr(ifs, *p) != NULL)
12321 setvar(*ap, stackblock(), 0);
12322 while (*++ap != NULL)
12323 setvar(*ap, nullstr, 0);
12328 umaskcmd(int argc UNUSED_PARAM, char **argv)
12330 static const char permuser[3] ALIGN1 = "ugo";
12331 static const char permmode[3] ALIGN1 = "rwx";
12332 static const short permmask[] ALIGN2 = {
12333 S_IRUSR, S_IWUSR, S_IXUSR,
12334 S_IRGRP, S_IWGRP, S_IXGRP,
12335 S_IROTH, S_IWOTH, S_IXOTH
12341 int symbolic_mode = 0;
12343 while (nextopt("S") != '\0') {
12354 if (symbolic_mode) {
12358 for (i = 0; i < 3; i++) {
12361 *p++ = permuser[i];
12363 for (j = 0; j < 3; j++) {
12364 if ((mask & permmask[3 * i + j]) == 0) {
12365 *p++ = permmode[j];
12373 out1fmt("%.4o\n", mask);
12376 if (isdigit((unsigned char) *ap)) {
12379 if (*ap >= '8' || *ap < '0')
12380 ash_msg_and_raise_error(illnum, argv[1]);
12381 mask = (mask << 3) + (*ap - '0');
12382 } while (*++ap != '\0');
12385 mask = ~mask & 0777;
12386 if (!bb_parse_mode(ap, &mask)) {
12387 ash_msg_and_raise_error("illegal mode: %s", ap);
12389 umask(~mask & 0777);
12398 * This code, originally by Doug Gwyn, Doug Kingston, Eric Gisin, and
12399 * Michael Rendell was ripped from pdksh 5.0.8 and hacked for use with
12400 * ash by J.T. Conklin.
12406 uint8_t cmd; /* RLIMIT_xxx fit into it */
12407 uint8_t factor_shift; /* shift by to get rlim_{cur,max} values */
12411 static const struct limits limits_tbl[] = {
12413 { RLIMIT_CPU, 0, 't' },
12415 #ifdef RLIMIT_FSIZE
12416 { RLIMIT_FSIZE, 9, 'f' },
12419 { RLIMIT_DATA, 10, 'd' },
12421 #ifdef RLIMIT_STACK
12422 { RLIMIT_STACK, 10, 's' },
12425 { RLIMIT_CORE, 9, 'c' },
12428 { RLIMIT_RSS, 10, 'm' },
12430 #ifdef RLIMIT_MEMLOCK
12431 { RLIMIT_MEMLOCK, 10, 'l' },
12433 #ifdef RLIMIT_NPROC
12434 { RLIMIT_NPROC, 0, 'p' },
12436 #ifdef RLIMIT_NOFILE
12437 { RLIMIT_NOFILE, 0, 'n' },
12440 { RLIMIT_AS, 10, 'v' },
12442 #ifdef RLIMIT_LOCKS
12443 { RLIMIT_LOCKS, 0, 'w' },
12446 static const char limits_name[] =
12448 "time(seconds)" "\0"
12450 #ifdef RLIMIT_FSIZE
12451 "file(blocks)" "\0"
12456 #ifdef RLIMIT_STACK
12460 "coredump(blocks)" "\0"
12465 #ifdef RLIMIT_MEMLOCK
12466 "locked memory(kb)" "\0"
12468 #ifdef RLIMIT_NPROC
12471 #ifdef RLIMIT_NOFILE
12477 #ifdef RLIMIT_LOCKS
12482 enum limtype { SOFT = 0x1, HARD = 0x2 };
12485 printlim(enum limtype how, const struct rlimit *limit,
12486 const struct limits *l)
12490 val = limit->rlim_max;
12492 val = limit->rlim_cur;
12494 if (val == RLIM_INFINITY)
12495 out1fmt("unlimited\n");
12497 val >>= l->factor_shift;
12498 out1fmt("%lld\n", (long long) val);
12503 ulimitcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12507 enum limtype how = SOFT | HARD;
12508 const struct limits *l;
12511 struct rlimit limit;
12514 while ((optc = nextopt("HSa"
12518 #ifdef RLIMIT_FSIZE
12524 #ifdef RLIMIT_STACK
12533 #ifdef RLIMIT_MEMLOCK
12536 #ifdef RLIMIT_NPROC
12539 #ifdef RLIMIT_NOFILE
12545 #ifdef RLIMIT_LOCKS
12563 for (l = limits_tbl; l->option != what; l++)
12566 set = *argptr ? 1 : 0;
12570 if (all || argptr[1])
12571 ash_msg_and_raise_error("too many arguments");
12572 if (strncmp(p, "unlimited\n", 9) == 0)
12573 val = RLIM_INFINITY;
12577 while ((c = *p++) >= '0' && c <= '9') {
12578 val = (val * 10) + (long)(c - '0');
12579 // val is actually 'unsigned long int' and can't get < 0
12580 if (val < (rlim_t) 0)
12584 ash_msg_and_raise_error("bad number");
12585 val <<= l->factor_shift;
12589 const char *lname = limits_name;
12590 for (l = limits_tbl; l != &limits_tbl[ARRAY_SIZE(limits_tbl)]; l++) {
12591 getrlimit(l->cmd, &limit);
12592 out1fmt("%-20s ", lname);
12593 lname += strlen(lname) + 1;
12594 printlim(how, &limit, l);
12599 getrlimit(l->cmd, &limit);
12602 limit.rlim_max = val;
12604 limit.rlim_cur = val;
12605 if (setrlimit(l->cmd, &limit) < 0)
12606 ash_msg_and_raise_error("error setting limit (%m)");
12608 printlim(how, &limit, l);
12614 /* ============ Math support */
12616 #if ENABLE_ASH_MATH_SUPPORT
12618 /* Copyright (c) 2001 Aaron Lehmann <aaronl@vitelus.com>
12620 Permission is hereby granted, free of charge, to any person obtaining
12621 a copy of this software and associated documentation files (the
12622 "Software"), to deal in the Software without restriction, including
12623 without limitation the rights to use, copy, modify, merge, publish,
12624 distribute, sublicense, and/or sell copies of the Software, and to
12625 permit persons to whom the Software is furnished to do so, subject to
12626 the following conditions:
12628 The above copyright notice and this permission notice shall be
12629 included in all copies or substantial portions of the Software.
12631 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
12632 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
12633 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
12634 IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
12635 CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
12636 TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
12637 SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
12640 /* This is my infix parser/evaluator. It is optimized for size, intended
12641 * as a replacement for yacc-based parsers. However, it may well be faster
12642 * than a comparable parser written in yacc. The supported operators are
12643 * listed in #defines below. Parens, order of operations, and error handling
12644 * are supported. This code is thread safe. The exact expression format should
12645 * be that which POSIX specifies for shells. */
12647 /* The code uses a simple two-stack algorithm. See
12648 * http://www.onthenet.com.au/~grahamis/int2008/week02/lect02.html
12649 * for a detailed explanation of the infix-to-postfix algorithm on which
12650 * this is based (this code differs in that it applies operators immediately
12651 * to the stack instead of adding them to a queue to end up with an
12654 /* To use the routine, call it with an expression string and error return
12658 * Aug 24, 2001 Manuel Novoa III
12660 * Reduced the generated code size by about 30% (i386) and fixed several bugs.
12662 * 1) In arith_apply():
12663 * a) Cached values of *numptr and &(numptr[-1]).
12664 * b) Removed redundant test for zero denominator.
12667 * a) Eliminated redundant code for processing operator tokens by moving
12668 * to a table-based implementation. Also folded handling of parens
12670 * b) Combined all 3 loops which called arith_apply to reduce generated
12671 * code size at the cost of speed.
12673 * 3) The following expressions were treated as valid by the original code:
12674 * 1() , 0! , 1 ( *3 ) .
12675 * These bugs have been fixed by internally enclosing the expression in
12676 * parens and then checking that all binary ops and right parens are
12677 * preceded by a valid expression (NUM_TOKEN).
12679 * Note: It may be desirable to replace Aaron's test for whitespace with
12680 * ctype's isspace() if it is used by another busybox applet or if additional
12681 * whitespace chars should be considered. Look below the "#include"s for a
12682 * precompiler test.
12686 * Aug 26, 2001 Manuel Novoa III
12688 * Return 0 for null expressions. Pointed out by Vladimir Oleynik.
12690 * Merge in Aaron's comments previously posted to the busybox list,
12691 * modified slightly to take account of my changes to the code.
12696 * (C) 2003 Vladimir Oleynik <dzo@simtreas.ru>
12698 * - allow access to variable,
12699 * used recursive find value indirection (c=2*2; a="c"; $((a+=2)) produce 6)
12700 * - realize assign syntax (VAR=expr, +=, *= etc)
12701 * - realize exponentiation (** operator)
12702 * - realize comma separated - expr, expr
12703 * - realise ++expr --expr expr++ expr--
12704 * - realise expr ? expr : expr (but, second expr calculate always)
12705 * - allow hexadecimal and octal numbers
12706 * - was restored loses XOR operator
12707 * - remove one goto label, added three ;-)
12708 * - protect $((num num)) as true zero expr (Manuel`s error)
12709 * - always use special isspace(), see comment from bash ;-)
12712 #define arith_isspace(arithval) \
12713 (arithval == ' ' || arithval == '\n' || arithval == '\t')
12715 typedef unsigned char operator;
12717 /* An operator's token id is a bit of a bitfield. The lower 5 bits are the
12718 * precedence, and 3 high bits are an ID unique across operators of that
12719 * precedence. The ID portion is so that multiple operators can have the
12720 * same precedence, ensuring that the leftmost one is evaluated first.
12721 * Consider * and /. */
12723 #define tok_decl(prec,id) (((id)<<5)|(prec))
12724 #define PREC(op) ((op) & 0x1F)
12726 #define TOK_LPAREN tok_decl(0,0)
12728 #define TOK_COMMA tok_decl(1,0)
12730 #define TOK_ASSIGN tok_decl(2,0)
12731 #define TOK_AND_ASSIGN tok_decl(2,1)
12732 #define TOK_OR_ASSIGN tok_decl(2,2)
12733 #define TOK_XOR_ASSIGN tok_decl(2,3)
12734 #define TOK_PLUS_ASSIGN tok_decl(2,4)
12735 #define TOK_MINUS_ASSIGN tok_decl(2,5)
12736 #define TOK_LSHIFT_ASSIGN tok_decl(2,6)
12737 #define TOK_RSHIFT_ASSIGN tok_decl(2,7)
12739 #define TOK_MUL_ASSIGN tok_decl(3,0)
12740 #define TOK_DIV_ASSIGN tok_decl(3,1)
12741 #define TOK_REM_ASSIGN tok_decl(3,2)
12743 /* all assign is right associativity and precedence eq, but (7+3)<<5 > 256 */
12744 #define convert_prec_is_assing(prec) do { if (prec == 3) prec = 2; } while (0)
12746 /* conditional is right associativity too */
12747 #define TOK_CONDITIONAL tok_decl(4,0)
12748 #define TOK_CONDITIONAL_SEP tok_decl(4,1)
12750 #define TOK_OR tok_decl(5,0)
12752 #define TOK_AND tok_decl(6,0)
12754 #define TOK_BOR tok_decl(7,0)
12756 #define TOK_BXOR tok_decl(8,0)
12758 #define TOK_BAND tok_decl(9,0)
12760 #define TOK_EQ tok_decl(10,0)
12761 #define TOK_NE tok_decl(10,1)
12763 #define TOK_LT tok_decl(11,0)
12764 #define TOK_GT tok_decl(11,1)
12765 #define TOK_GE tok_decl(11,2)
12766 #define TOK_LE tok_decl(11,3)
12768 #define TOK_LSHIFT tok_decl(12,0)
12769 #define TOK_RSHIFT tok_decl(12,1)
12771 #define TOK_ADD tok_decl(13,0)
12772 #define TOK_SUB tok_decl(13,1)
12774 #define TOK_MUL tok_decl(14,0)
12775 #define TOK_DIV tok_decl(14,1)
12776 #define TOK_REM tok_decl(14,2)
12778 /* exponent is right associativity */
12779 #define TOK_EXPONENT tok_decl(15,1)
12781 /* For now unary operators. */
12782 #define UNARYPREC 16
12783 #define TOK_BNOT tok_decl(UNARYPREC,0)
12784 #define TOK_NOT tok_decl(UNARYPREC,1)
12786 #define TOK_UMINUS tok_decl(UNARYPREC+1,0)
12787 #define TOK_UPLUS tok_decl(UNARYPREC+1,1)
12789 #define PREC_PRE (UNARYPREC+2)
12791 #define TOK_PRE_INC tok_decl(PREC_PRE, 0)
12792 #define TOK_PRE_DEC tok_decl(PREC_PRE, 1)
12794 #define PREC_POST (UNARYPREC+3)
12796 #define TOK_POST_INC tok_decl(PREC_POST, 0)
12797 #define TOK_POST_DEC tok_decl(PREC_POST, 1)
12799 #define SPEC_PREC (UNARYPREC+4)
12801 #define TOK_NUM tok_decl(SPEC_PREC, 0)
12802 #define TOK_RPAREN tok_decl(SPEC_PREC, 1)
12804 #define NUMPTR (*numstackptr)
12807 tok_have_assign(operator op)
12809 operator prec = PREC(op);
12811 convert_prec_is_assing(prec);
12812 return (prec == PREC(TOK_ASSIGN) ||
12813 prec == PREC_PRE || prec == PREC_POST);
12817 is_right_associativity(operator prec)
12819 return (prec == PREC(TOK_ASSIGN) || prec == PREC(TOK_EXPONENT)
12820 || prec == PREC(TOK_CONDITIONAL));
12825 arith_t contidional_second_val;
12826 char contidional_second_val_initialized;
12827 char *var; /* if NULL then is regular number,
12828 else is variable name */
12831 typedef struct chk_var_recursive_looped_t {
12833 struct chk_var_recursive_looped_t *next;
12834 } chk_var_recursive_looped_t;
12836 static chk_var_recursive_looped_t *prev_chk_var_recursive;
12839 arith_lookup_val(v_n_t *t)
12842 const char * p = lookupvar(t->var);
12847 /* recursive try as expression */
12848 chk_var_recursive_looped_t *cur;
12849 chk_var_recursive_looped_t cur_save;
12851 for (cur = prev_chk_var_recursive; cur; cur = cur->next) {
12852 if (strcmp(cur->var, t->var) == 0) {
12853 /* expression recursion loop detected */
12857 /* save current lookuped var name */
12858 cur = prev_chk_var_recursive;
12859 cur_save.var = t->var;
12860 cur_save.next = cur;
12861 prev_chk_var_recursive = &cur_save;
12863 t->val = arith (p, &errcode);
12864 /* restore previous ptr after recursiving */
12865 prev_chk_var_recursive = cur;
12868 /* allow undefined var as 0 */
12874 /* "applying" a token means performing it on the top elements on the integer
12875 * stack. For a unary operator it will only change the top element, but a
12876 * binary operator will pop two arguments and push a result */
12878 arith_apply(operator op, v_n_t *numstack, v_n_t **numstackptr)
12881 arith_t numptr_val, rez;
12882 int ret_arith_lookup_val;
12884 /* There is no operator that can work without arguments */
12885 if (NUMPTR == numstack) goto err;
12886 numptr_m1 = NUMPTR - 1;
12888 /* check operand is var with noninteger value */
12889 ret_arith_lookup_val = arith_lookup_val(numptr_m1);
12890 if (ret_arith_lookup_val)
12891 return ret_arith_lookup_val;
12893 rez = numptr_m1->val;
12894 if (op == TOK_UMINUS)
12896 else if (op == TOK_NOT)
12898 else if (op == TOK_BNOT)
12900 else if (op == TOK_POST_INC || op == TOK_PRE_INC)
12902 else if (op == TOK_POST_DEC || op == TOK_PRE_DEC)
12904 else if (op != TOK_UPLUS) {
12905 /* Binary operators */
12907 /* check and binary operators need two arguments */
12908 if (numptr_m1 == numstack) goto err;
12910 /* ... and they pop one */
12913 if (op == TOK_CONDITIONAL) {
12914 if (!numptr_m1->contidional_second_val_initialized) {
12915 /* protect $((expr1 ? expr2)) without ": expr" */
12918 rez = numptr_m1->contidional_second_val;
12919 } else if (numptr_m1->contidional_second_val_initialized) {
12920 /* protect $((expr1 : expr2)) without "expr ? " */
12923 numptr_m1 = NUMPTR - 1;
12924 if (op != TOK_ASSIGN) {
12925 /* check operand is var with noninteger value for not '=' */
12926 ret_arith_lookup_val = arith_lookup_val(numptr_m1);
12927 if (ret_arith_lookup_val)
12928 return ret_arith_lookup_val;
12930 if (op == TOK_CONDITIONAL) {
12931 numptr_m1->contidional_second_val = rez;
12933 rez = numptr_m1->val;
12934 if (op == TOK_BOR || op == TOK_OR_ASSIGN)
12936 else if (op == TOK_OR)
12937 rez = numptr_val || rez;
12938 else if (op == TOK_BAND || op == TOK_AND_ASSIGN)
12940 else if (op == TOK_BXOR || op == TOK_XOR_ASSIGN)
12942 else if (op == TOK_AND)
12943 rez = rez && numptr_val;
12944 else if (op == TOK_EQ)
12945 rez = (rez == numptr_val);
12946 else if (op == TOK_NE)
12947 rez = (rez != numptr_val);
12948 else if (op == TOK_GE)
12949 rez = (rez >= numptr_val);
12950 else if (op == TOK_RSHIFT || op == TOK_RSHIFT_ASSIGN)
12951 rez >>= numptr_val;
12952 else if (op == TOK_LSHIFT || op == TOK_LSHIFT_ASSIGN)
12953 rez <<= numptr_val;
12954 else if (op == TOK_GT)
12955 rez = (rez > numptr_val);
12956 else if (op == TOK_LT)
12957 rez = (rez < numptr_val);
12958 else if (op == TOK_LE)
12959 rez = (rez <= numptr_val);
12960 else if (op == TOK_MUL || op == TOK_MUL_ASSIGN)
12962 else if (op == TOK_ADD || op == TOK_PLUS_ASSIGN)
12964 else if (op == TOK_SUB || op == TOK_MINUS_ASSIGN)
12966 else if (op == TOK_ASSIGN || op == TOK_COMMA)
12968 else if (op == TOK_CONDITIONAL_SEP) {
12969 if (numptr_m1 == numstack) {
12970 /* protect $((expr : expr)) without "expr ? " */
12973 numptr_m1->contidional_second_val_initialized = op;
12974 numptr_m1->contidional_second_val = numptr_val;
12975 } else if (op == TOK_CONDITIONAL) {
12977 numptr_val : numptr_m1->contidional_second_val;
12978 } else if (op == TOK_EXPONENT) {
12979 if (numptr_val < 0)
12980 return -3; /* exponent less than 0 */
12985 while (numptr_val--)
12989 } else if (numptr_val==0) /* zero divisor check */
12991 else if (op == TOK_DIV || op == TOK_DIV_ASSIGN)
12993 else if (op == TOK_REM || op == TOK_REM_ASSIGN)
12996 if (tok_have_assign(op)) {
12997 char buf[sizeof(arith_t_type)*3 + 2];
12999 if (numptr_m1->var == NULL) {
13003 /* save to shell variable */
13004 #if ENABLE_ASH_MATH_SUPPORT_64
13005 snprintf(buf, sizeof(buf), "%lld", (arith_t_type) rez);
13007 snprintf(buf, sizeof(buf), "%ld", (arith_t_type) rez);
13009 setvar(numptr_m1->var, buf, 0);
13010 /* after saving, make previous value for v++ or v-- */
13011 if (op == TOK_POST_INC)
13013 else if (op == TOK_POST_DEC)
13016 numptr_m1->val = rez;
13017 /* protect geting var value, is number now */
13018 numptr_m1->var = NULL;
13024 /* longest must be first */
13025 static const char op_tokens[] ALIGN1 = {
13026 '<','<','=',0, TOK_LSHIFT_ASSIGN,
13027 '>','>','=',0, TOK_RSHIFT_ASSIGN,
13028 '<','<', 0, TOK_LSHIFT,
13029 '>','>', 0, TOK_RSHIFT,
13030 '|','|', 0, TOK_OR,
13031 '&','&', 0, TOK_AND,
13032 '!','=', 0, TOK_NE,
13033 '<','=', 0, TOK_LE,
13034 '>','=', 0, TOK_GE,
13035 '=','=', 0, TOK_EQ,
13036 '|','=', 0, TOK_OR_ASSIGN,
13037 '&','=', 0, TOK_AND_ASSIGN,
13038 '*','=', 0, TOK_MUL_ASSIGN,
13039 '/','=', 0, TOK_DIV_ASSIGN,
13040 '%','=', 0, TOK_REM_ASSIGN,
13041 '+','=', 0, TOK_PLUS_ASSIGN,
13042 '-','=', 0, TOK_MINUS_ASSIGN,
13043 '-','-', 0, TOK_POST_DEC,
13044 '^','=', 0, TOK_XOR_ASSIGN,
13045 '+','+', 0, TOK_POST_INC,
13046 '*','*', 0, TOK_EXPONENT,
13050 '=', 0, TOK_ASSIGN,
13062 '?', 0, TOK_CONDITIONAL,
13063 ':', 0, TOK_CONDITIONAL_SEP,
13064 ')', 0, TOK_RPAREN,
13065 '(', 0, TOK_LPAREN,
13069 #define endexpression (&op_tokens[sizeof(op_tokens)-7])
13072 arith(const char *expr, int *perrcode)
13074 char arithval; /* Current character under analysis */
13075 operator lasttok, op;
13077 operator *stack, *stackptr;
13078 const char *p = endexpression;
13080 v_n_t *numstack, *numstackptr;
13081 unsigned datasizes = strlen(expr) + 2;
13083 /* Stack of integers */
13084 /* The proof that there can be no more than strlen(startbuf)/2+1 integers
13085 * in any given correct or incorrect expression is left as an exercise to
13087 numstackptr = numstack = alloca((datasizes / 2) * sizeof(numstack[0]));
13088 /* Stack of operator tokens */
13089 stackptr = stack = alloca(datasizes * sizeof(stack[0]));
13091 *stackptr++ = lasttok = TOK_LPAREN; /* start off with a left paren */
13092 *perrcode = errcode = 0;
13096 if (arithval == 0) {
13097 if (p == endexpression) {
13098 /* Null expression. */
13102 /* This is only reached after all tokens have been extracted from the
13103 * input stream. If there are still tokens on the operator stack, they
13104 * are to be applied in order. At the end, there should be a final
13105 * result on the integer stack */
13107 if (expr != endexpression + 1) {
13108 /* If we haven't done so already, */
13109 /* append a closing right paren */
13110 expr = endexpression;
13111 /* and let the loop process it. */
13114 /* At this point, we're done with the expression. */
13115 if (numstackptr != numstack+1) {
13116 /* ... but if there isn't, it's bad */
13121 if (numstack->var) {
13122 /* expression is $((var)) only, lookup now */
13123 errcode = arith_lookup_val(numstack);
13126 *perrcode = errcode;
13127 return numstack->val;
13130 /* Continue processing the expression. */
13131 if (arith_isspace(arithval)) {
13132 /* Skip whitespace */
13135 p = endofname(expr);
13137 size_t var_name_size = (p-expr) + 1; /* trailing zero */
13139 numstackptr->var = alloca(var_name_size);
13140 safe_strncpy(numstackptr->var, expr, var_name_size);
13143 numstackptr->contidional_second_val_initialized = 0;
13148 if (isdigit(arithval)) {
13149 numstackptr->var = NULL;
13150 #if ENABLE_ASH_MATH_SUPPORT_64
13151 numstackptr->val = strtoll(expr, (char **) &expr, 0);
13153 numstackptr->val = strtol(expr, (char **) &expr, 0);
13157 for (p = op_tokens; ; p++) {
13161 /* strange operator not found */
13164 for (o = expr; *p && *o == *p; p++)
13171 /* skip tail uncompared token */
13174 /* skip zero delim */
13179 /* post grammar: a++ reduce to num */
13180 if (lasttok == TOK_POST_INC || lasttok == TOK_POST_DEC)
13183 /* Plus and minus are binary (not unary) _only_ if the last
13184 * token was as number, or a right paren (which pretends to be
13185 * a number, since it evaluates to one). Think about it.
13186 * It makes sense. */
13187 if (lasttok != TOK_NUM) {
13203 /* We don't want a unary operator to cause recursive descent on the
13204 * stack, because there can be many in a row and it could cause an
13205 * operator to be evaluated before its argument is pushed onto the
13206 * integer stack. */
13207 /* But for binary operators, "apply" everything on the operator
13208 * stack until we find an operator with a lesser priority than the
13209 * one we have just extracted. */
13210 /* Left paren is given the lowest priority so it will never be
13211 * "applied" in this way.
13212 * if associativity is right and priority eq, applied also skip
13215 if ((prec > 0 && prec < UNARYPREC) || prec == SPEC_PREC) {
13216 /* not left paren or unary */
13217 if (lasttok != TOK_NUM) {
13218 /* binary op must be preceded by a num */
13221 while (stackptr != stack) {
13222 if (op == TOK_RPAREN) {
13223 /* The algorithm employed here is simple: while we don't
13224 * hit an open paren nor the bottom of the stack, pop
13225 * tokens and apply them */
13226 if (stackptr[-1] == TOK_LPAREN) {
13228 /* Any operator directly after a */
13230 /* close paren should consider itself binary */
13234 operator prev_prec = PREC(stackptr[-1]);
13236 convert_prec_is_assing(prec);
13237 convert_prec_is_assing(prev_prec);
13238 if (prev_prec < prec)
13240 /* check right assoc */
13241 if (prev_prec == prec && is_right_associativity(prec))
13244 errcode = arith_apply(*--stackptr, numstack, &numstackptr);
13245 if (errcode) goto ret;
13247 if (op == TOK_RPAREN) {
13252 /* Push this operator to the stack and remember it. */
13253 *stackptr++ = lasttok = op;
13258 #endif /* ASH_MATH_SUPPORT */
13261 /* ============ main() and helpers */
13264 * Called to exit the shell.
13266 static void exitshell(void) NORETURN;
13274 status = exitstatus;
13275 TRACE(("pid %d, exitshell(%d)\n", getpid(), status));
13276 if (setjmp(loc.loc)) {
13277 if (exception == EXEXIT)
13278 /* dash bug: it just does _exit(exitstatus) here
13279 * but we have to do setjobctl(0) first!
13280 * (bug is still not fixed in dash-0.5.3 - if you run dash
13281 * under Midnight Commander, on exit from dash MC is backgrounded) */
13282 status = exitstatus;
13285 exception_handler = &loc;
13291 flush_stdout_stderr();
13301 /* from input.c: */
13302 basepf.nextc = basepf.buf = basebuf;
13305 signal(SIGCHLD, SIG_DFL);
13310 char ppid[sizeof(int)*3 + 1];
13312 struct stat st1, st2;
13315 for (envp = environ; envp && *envp; envp++) {
13316 if (strchr(*envp, '=')) {
13317 setvareq(*envp, VEXPORT|VTEXTFIXED);
13321 snprintf(ppid, sizeof(ppid), "%u", (unsigned) getppid());
13322 setvar("PPID", ppid, 0);
13324 p = lookupvar("PWD");
13326 if (*p != '/' || stat(p, &st1) || stat(".", &st2)
13327 || st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino)
13334 * Process the shell command line arguments.
13337 procargs(char **argv)
13340 const char *xminusc;
13345 /* if (xargv[0]) - mmm, this is always true! */
13347 for (i = 0; i < NOPTS; i++)
13351 /* it already printed err message */
13352 raise_exception(EXERROR);
13356 if (*xargv == NULL) {
13358 ash_msg_and_raise_error(bb_msg_requires_arg, "-c");
13361 if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
13365 for (i = 0; i < NOPTS; i++)
13366 if (optlist[i] == 2)
13371 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
13376 } else if (!sflag) {
13377 setinputfile(*xargv, 0);
13380 commandname = arg0;
13383 shellparam.p = xargv;
13384 #if ENABLE_ASH_GETOPTS
13385 shellparam.optind = 1;
13386 shellparam.optoff = -1;
13388 /* assert(shellparam.malloced == 0 && shellparam.nparam == 0); */
13390 shellparam.nparam++;
13397 * Read /etc/profile or .profile.
13400 read_profile(const char *name)
13404 if (setinputfile(name, INPUT_PUSH_FILE | INPUT_NOFILE_OK) < 0)
13413 * This routine is called when an error or an interrupt occurs in an
13414 * interactive shell and control is returned to the main command loop.
13422 /* from input.c: */
13423 parselleft = parsenleft = 0; /* clear input buffer */
13425 /* from parser.c: */
13428 /* from redir.c: */
13433 static short profile_buf[16384];
13434 extern int etext();
13438 * Main routine. We initialize things, parse the arguments, execute
13439 * profiles if we're a login shell, and then call cmdloop to execute
13440 * commands. The setjmp call sets up the location to jump to when an
13441 * exception occurs. When an exception occurs the variable "state"
13442 * is used to figure out how far we had gotten.
13444 int ash_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
13445 int ash_main(int argc UNUSED_PARAM, char **argv)
13448 volatile int state;
13449 struct jmploc jmploc;
13450 struct stackmark smark;
13452 /* Initialize global data */
13456 #if ENABLE_ASH_ALIAS
13462 monitor(4, etext, profile_buf, sizeof(profile_buf), 50);
13465 #if ENABLE_FEATURE_EDITING
13466 line_input_state = new_line_input_t(FOR_SHELL | WITH_PATH_LOOKUP);
13469 if (setjmp(jmploc.loc)) {
13479 if (e == EXEXIT || s == 0 || iflag == 0 || shlvl)
13483 outcslow('\n', stderr);
13485 popstackmark(&smark);
13486 FORCE_INT_ON; /* enable interrupts */
13495 exception_handler = &jmploc;
13498 trace_puts("Shell args: ");
13499 trace_puts_args(argv);
13501 rootpid = getpid();
13503 #if ENABLE_ASH_RANDOM_SUPPORT
13504 /* Can use monotonic_ns() for better randomness but for now it is
13505 * not used anywhere else in busybox... so avoid bloat */
13506 random_galois_LFSR = random_LCG = rootpid + monotonic_us();
13509 setstackmark(&smark);
13512 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
13514 const char *hp = lookupvar("HISTFILE");
13517 hp = lookupvar("HOME");
13519 char *defhp = concat_path_file(hp, ".ash_history");
13520 setvar("HISTFILE", defhp, 0);
13526 if (argv[0] && argv[0][0] == '-')
13530 read_profile("/etc/profile");
13533 read_profile(".profile");
13539 getuid() == geteuid() && getgid() == getegid() &&
13543 shinit = lookupvar("ENV");
13544 if (shinit != NULL && *shinit != '\0') {
13545 read_profile(shinit);
13551 evalstring(minusc, 0);
13553 if (sflag || minusc == NULL) {
13554 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
13556 const char *hp = lookupvar("HISTFILE");
13559 line_input_state->hist_file = hp;
13562 state4: /* XXX ??? - why isn't this before the "if" statement */
13570 extern void _mcleanup(void);
13579 const char *applet_name = "debug stuff usage";
13580 int main(int argc, char **argv)
13582 return ash_main(argc, argv);
13588 * Copyright (c) 1989, 1991, 1993, 1994
13589 * The Regents of the University of California. All rights reserved.
13591 * This code is derived from software contributed to Berkeley by
13592 * Kenneth Almquist.
13594 * Redistribution and use in source and binary forms, with or without
13595 * modification, are permitted provided that the following conditions
13597 * 1. Redistributions of source code must retain the above copyright
13598 * notice, this list of conditions and the following disclaimer.
13599 * 2. Redistributions in binary form must reproduce the above copyright
13600 * notice, this list of conditions and the following disclaimer in the
13601 * documentation and/or other materials provided with the distribution.
13602 * 3. Neither the name of the University nor the names of its contributors
13603 * may be used to endorse or promote products derived from this software
13604 * without specific prior written permission.
13606 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
13607 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
13608 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
13609 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
13610 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
13611 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
13612 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
13613 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
13614 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
13615 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF