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.
4849 /* 0x800..00: bit to set in "to" to request dup2 instead of fcntl(F_DUPFD).
4850 * old code was doing close(to) prior to copyfd() to achieve the same */
4852 COPYFD_EXACT = (int)~(INT_MAX),
4853 COPYFD_RESTORE = (int)((unsigned)COPYFD_EXACT >> 1),
4856 copyfd(int from, int to)
4860 if (to & COPYFD_EXACT) {
4861 to &= ~COPYFD_EXACT;
4863 newfd = dup2(from, to);
4865 newfd = fcntl(from, F_DUPFD, to);
4868 if (errno == EMFILE)
4870 /* Happens when source fd is not open: try "echo >&99" */
4871 ash_msg_and_raise_error("%d: %m", from);
4876 /* Struct def and variable are moved down to the first usage site */
4881 struct redirtab *next;
4884 struct two_fd_t two_fd[0];
4886 #define redirlist (G_var.redirlist)
4888 static int need_to_remember(struct redirtab *rp, int fd)
4892 if (!rp) /* remebering was not requested */
4895 for (i = 0; i < rp->pair_count; i++) {
4896 if (rp->two_fd[i].orig == fd) {
4897 /* already remembered */
4905 * Process a list of redirection commands. If the REDIR_PUSH flag is set,
4906 * old file descriptors are stashed away so that the redirection can be
4907 * undone by calling popredir. If the REDIR_BACKQ flag is set, then the
4908 * standard output, and the standard error if it becomes a duplicate of
4909 * stdout, is saved in memory.
4911 /* flags passed to redirect */
4912 #define REDIR_PUSH 01 /* save previous values of file descriptors */
4913 #define REDIR_SAVEFD2 03 /* set preverrout */
4915 redirect(union node *redir, int flags)
4917 struct redirtab *sv;
4922 int copied_fd2 = -1;
4932 if (flags & REDIR_PUSH) {
4933 union node *tmp = redir;
4936 tmp = tmp->nfile.next;
4938 sv = ckmalloc(sizeof(*sv) + sv_pos * sizeof(sv->two_fd[0]));
4939 sv->next = redirlist;
4940 sv->pair_count = sv_pos;
4942 sv->nullredirs = g_nullredirs - 1;
4944 while (sv_pos > 0) {
4946 sv->two_fd[sv_pos].orig = sv->two_fd[sv_pos].copy = EMPTY;
4951 fd = redir->nfile.fd;
4952 if (redir->nfile.type == NTOFD || redir->nfile.type == NFROMFD) {
4953 if (redir->ndup.dupfd == fd)
4954 continue; /* redirect from/to same file descriptor */
4957 newfd = openredirect(redir); /* always >= 0 */
4959 /* Descriptor wasn't open before redirect.
4960 * Mark it for close in the future */
4961 if (need_to_remember(sv, fd)) {
4962 goto remember_to_close;
4967 if (need_to_remember(sv, fd)) {
4968 /* Copy old descriptor */
4969 i = fcntl(fd, F_DUPFD, 10);
4970 /* You'd expect copy to be CLOEXECed. Currently these extra "saved" fds
4971 * are closed in popredir() in the child, preventing them from leaking
4972 * into child. (popredir() also cleans up the mess in case of failures)
4977 /* Strange error (e.g. "too many files" EMFILE?) */
4981 ash_msg_and_raise_error("%d: %m", fd);
4984 /* EBADF: it is not open - good, remember to close it */
4987 } else { /* fd is open, save its copy */
4988 /* "exec fd>&-" should not close fds
4989 * which point to script file(s).
4990 * Force them to be restored afterwards */
4991 struct parsefile *pf = g_parsefile;
4994 i |= COPYFD_RESTORE;
5002 sv->two_fd[sv_pos].orig = fd;
5003 sv->two_fd[sv_pos].copy = i;
5007 /* NTOFD/NFROMFD: copy redir->ndup.dupfd to fd */
5008 if (redir->ndup.dupfd < 0) { /* "fd>&-" */
5011 copyfd(redir->ndup.dupfd, fd | COPYFD_EXACT);
5013 } else if (fd != newfd) { /* move newfd to fd */
5014 copyfd(newfd, fd | COPYFD_EXACT);
5017 } while ((redir = redir->nfile.next) != NULL);
5020 if ((flags & REDIR_SAVEFD2) && copied_fd2 >= 0)
5021 preverrout_fd = copied_fd2;
5025 * Undo the effects of the last redirection.
5030 struct redirtab *rp;
5033 if (--g_nullredirs >= 0)
5037 for (i = 0; i < rp->pair_count; i++) {
5038 int fd = rp->two_fd[i].orig;
5039 int copy = rp->two_fd[i].copy;
5040 if (copy == CLOSED) {
5045 if (copy != EMPTY) {
5046 if (!drop || (copy & COPYFD_RESTORE)) {
5047 copy &= ~COPYFD_RESTORE;
5049 copyfd(copy, fd | COPYFD_EXACT);
5054 redirlist = rp->next;
5055 g_nullredirs = rp->nullredirs;
5061 * Undo all redirections. Called on error or interrupt.
5065 * Discard all saved file descriptors.
5068 clearredir(int drop)
5079 redirectsafe(union node *redir, int flags)
5082 volatile int saveint;
5083 struct jmploc *volatile savehandler = exception_handler;
5084 struct jmploc jmploc;
5087 /* "echo 9>/dev/null; echo >&9; echo result: $?" - result should be 1, not 2! */
5088 err = setjmp(jmploc.loc); // huh?? was = setjmp(jmploc.loc) * 2;
5090 exception_handler = &jmploc;
5091 redirect(redir, flags);
5093 exception_handler = savehandler;
5094 if (err && exception != EXERROR)
5095 longjmp(exception_handler->loc, 1);
5096 RESTORE_INT(saveint);
5101 /* ============ Routines to expand arguments to commands
5103 * We have to deal with backquotes, shell variables, and file metacharacters.
5106 #if ENABLE_ASH_MATH_SUPPORT_64
5107 typedef int64_t arith_t;
5108 #define arith_t_type long long
5110 typedef long arith_t;
5111 #define arith_t_type long
5114 #if ENABLE_ASH_MATH_SUPPORT
5115 static arith_t dash_arith(const char *);
5116 static arith_t arith(const char *expr, int *perrcode);
5122 #define EXP_FULL 0x1 /* perform word splitting & file globbing */
5123 #define EXP_TILDE 0x2 /* do normal tilde expansion */
5124 #define EXP_VARTILDE 0x4 /* expand tildes in an assignment */
5125 #define EXP_REDIR 0x8 /* file glob for a redirection (1 match only) */
5126 #define EXP_CASE 0x10 /* keeps quotes around for CASE pattern */
5127 #define EXP_RECORD 0x20 /* need to record arguments for ifs breakup */
5128 #define EXP_VARTILDE2 0x40 /* expand tildes after colons only */
5129 #define EXP_WORD 0x80 /* expand word in parameter expansion */
5130 #define EXP_QWORD 0x100 /* expand word in quoted parameter expansion */
5134 #define RMESCAPE_ALLOC 0x1 /* Allocate a new string */
5135 #define RMESCAPE_GLOB 0x2 /* Add backslashes for glob */
5136 #define RMESCAPE_QUOTED 0x4 /* Remove CTLESC unless in quotes */
5137 #define RMESCAPE_GROW 0x8 /* Grow strings instead of stalloc */
5138 #define RMESCAPE_HEAP 0x10 /* Malloc strings instead of stalloc */
5141 * Structure specifying which parts of the string should be searched
5142 * for IFS characters.
5145 struct ifsregion *next; /* next region in list */
5146 int begoff; /* offset of start of region */
5147 int endoff; /* offset of end of region */
5148 int nulonly; /* search for nul bytes only */
5152 struct strlist *list;
5153 struct strlist **lastp;
5156 /* output of current string */
5157 static char *expdest;
5158 /* list of back quote expressions */
5159 static struct nodelist *argbackq;
5160 /* first struct in list of ifs regions */
5161 static struct ifsregion ifsfirst;
5162 /* last struct in list */
5163 static struct ifsregion *ifslastp;
5164 /* holds expanded arg list */
5165 static struct arglist exparg;
5175 expdest = makestrspace(32, expdest);
5176 #if ENABLE_ASH_MATH_SUPPORT_64
5177 len = fmtstr(expdest, 32, "%lld", (long long) num);
5179 len = fmtstr(expdest, 32, "%ld", num);
5181 STADJUST(len, expdest);
5186 esclen(const char *start, const char *p)
5190 while (p > start && *--p == CTLESC) {
5197 * Remove any CTLESC characters from a string.
5200 _rmescapes(char *str, int flag)
5202 static const char qchars[] ALIGN1 = { CTLESC, CTLQUOTEMARK, '\0' };
5209 p = strpbrk(str, qchars);
5215 if (flag & RMESCAPE_ALLOC) {
5216 size_t len = p - str;
5217 size_t fulllen = len + strlen(p) + 1;
5219 if (flag & RMESCAPE_GROW) {
5220 r = makestrspace(fulllen, expdest);
5221 } else if (flag & RMESCAPE_HEAP) {
5222 r = ckmalloc(fulllen);
5224 r = stalloc(fulllen);
5228 q = (char *)memcpy(q, str, len) + len;
5231 inquotes = (flag & RMESCAPE_QUOTED) ^ RMESCAPE_QUOTED;
5232 globbing = flag & RMESCAPE_GLOB;
5233 notescaped = globbing;
5235 if (*p == CTLQUOTEMARK) {
5236 inquotes = ~inquotes;
5238 notescaped = globbing;
5242 /* naked back slash */
5248 if (notescaped && inquotes && *p != '/') {
5252 notescaped = globbing;
5257 if (flag & RMESCAPE_GROW) {
5259 STADJUST(q - r + 1, expdest);
5263 #define rmescapes(p) _rmescapes((p), 0)
5265 #define pmatch(a, b) !fnmatch((a), (b), 0)
5268 * Prepare a pattern for a expmeta (internal glob(3)) call.
5270 * Returns an stalloced string.
5273 preglob(const char *pattern, int quoted, int flag)
5275 flag |= RMESCAPE_GLOB;
5277 flag |= RMESCAPE_QUOTED;
5279 return _rmescapes((char *)pattern, flag);
5283 * Put a string on the stack.
5286 memtodest(const char *p, size_t len, int syntax, int quotes)
5290 q = makestrspace(len * 2, q);
5293 int c = signed_char2int(*p++);
5296 if (quotes && (SIT(c, syntax) == CCTL || SIT(c, syntax) == CBACK))
5305 strtodest(const char *p, int syntax, int quotes)
5307 memtodest(p, strlen(p), syntax, quotes);
5311 * Record the fact that we have to scan this region of the
5312 * string for IFS characters.
5315 recordregion(int start, int end, int nulonly)
5317 struct ifsregion *ifsp;
5319 if (ifslastp == NULL) {
5323 ifsp = ckzalloc(sizeof(*ifsp));
5324 /*ifsp->next = NULL; - ckzalloc did it */
5325 ifslastp->next = ifsp;
5329 ifslastp->begoff = start;
5330 ifslastp->endoff = end;
5331 ifslastp->nulonly = nulonly;
5335 removerecordregions(int endoff)
5337 if (ifslastp == NULL)
5340 if (ifsfirst.endoff > endoff) {
5341 while (ifsfirst.next != NULL) {
5342 struct ifsregion *ifsp;
5344 ifsp = ifsfirst.next->next;
5345 free(ifsfirst.next);
5346 ifsfirst.next = ifsp;
5349 if (ifsfirst.begoff > endoff)
5352 ifslastp = &ifsfirst;
5353 ifsfirst.endoff = endoff;
5358 ifslastp = &ifsfirst;
5359 while (ifslastp->next && ifslastp->next->begoff < endoff)
5360 ifslastp=ifslastp->next;
5361 while (ifslastp->next != NULL) {
5362 struct ifsregion *ifsp;
5364 ifsp = ifslastp->next->next;
5365 free(ifslastp->next);
5366 ifslastp->next = ifsp;
5369 if (ifslastp->endoff > endoff)
5370 ifslastp->endoff = endoff;
5374 exptilde(char *startp, char *p, int flag)
5380 int quotes = flag & (EXP_FULL | EXP_CASE);
5385 while ((c = *++p) != '\0') {
5392 if (flag & EXP_VARTILDE)
5402 if (*name == '\0') {
5403 home = lookupvar(homestr);
5405 pw = getpwnam(name);
5410 if (!home || !*home)
5413 startloc = expdest - (char *)stackblock();
5414 strtodest(home, SQSYNTAX, quotes);
5415 recordregion(startloc, expdest - (char *)stackblock(), 0);
5423 * Execute a command inside back quotes. If it's a builtin command, we
5424 * want to save its output in a block obtained from malloc. Otherwise
5425 * we fork off a subprocess and get the output of the command via a pipe.
5426 * Should be called with interrupts off.
5428 struct backcmd { /* result of evalbackcmd */
5429 int fd; /* file descriptor to read from */
5430 int nleft; /* number of chars in buffer */
5431 char *buf; /* buffer */
5432 struct job *jp; /* job structure for command */
5435 /* These forward decls are needed to use "eval" code for backticks handling: */
5436 static uint8_t back_exitstatus; /* exit status of backquoted command */
5437 #define EV_EXIT 01 /* exit after evaluating tree */
5438 static void evaltree(union node *, int);
5441 evalbackcmd(union node *n, struct backcmd *result)
5453 saveherefd = herefd;
5461 ash_msg_and_raise_error("pipe call failed");
5462 jp = makejob(/*n,*/ 1);
5463 if (forkshell(jp, n, FORK_NOJOB) == 0) {
5468 copyfd(pip[1], 1 | COPYFD_EXACT);
5472 evaltree(n, EV_EXIT); /* actually evaltreenr... */
5476 result->fd = pip[0];
5479 herefd = saveherefd;
5481 TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n",
5482 result->fd, result->buf, result->nleft, result->jp));
5486 * Expand stuff in backwards quotes.
5489 expbackq(union node *cmd, int quoted, int quotes)
5497 int syntax = quoted ? DQSYNTAX : BASESYNTAX;
5498 struct stackmark smark;
5501 setstackmark(&smark);
5503 startloc = dest - (char *)stackblock();
5505 evalbackcmd(cmd, &in);
5506 popstackmark(&smark);
5513 memtodest(p, i, syntax, quotes);
5517 i = nonblock_safe_read(in.fd, buf, sizeof(buf));
5518 TRACE(("expbackq: read returns %d\n", i));
5527 back_exitstatus = waitforjob(in.jp);
5531 /* Eat all trailing newlines */
5533 for (; dest > (char *)stackblock() && dest[-1] == '\n';)
5538 recordregion(startloc, dest - (char *)stackblock(), 0);
5539 TRACE(("evalbackq: size=%d: \"%.*s\"\n",
5540 (dest - (char *)stackblock()) - startloc,
5541 (dest - (char *)stackblock()) - startloc,
5542 stackblock() + startloc));
5545 #if ENABLE_ASH_MATH_SUPPORT
5547 * Expand arithmetic expression. Backup to start of expression,
5548 * evaluate, place result in (backed up) result, adjust string position.
5561 * This routine is slightly over-complicated for
5562 * efficiency. Next we scan backwards looking for the
5563 * start of arithmetic.
5565 start = stackblock();
5572 while (*p != CTLARI) {
5576 ash_msg_and_raise_error("missing CTLARI (shouldn't happen)");
5581 esc = esclen(start, p);
5591 removerecordregions(begoff);
5600 len = cvtnum(dash_arith(p + 2));
5603 recordregion(begoff, begoff + len, 0);
5607 /* argstr needs it */
5608 static char *evalvar(char *p, int flag, struct strlist *var_str_list);
5611 * Perform variable and command substitution. If EXP_FULL is set, output CTLESC
5612 * characters to allow for further processing. Otherwise treat
5613 * $@ like $* since no splitting will be performed.
5615 * var_str_list (can be NULL) is a list of "VAR=val" strings which take precedence
5616 * over shell varables. Needed for "A=a B=$A; echo $B" case - we use it
5617 * for correct expansion of "B=$A" word.
5620 argstr(char *p, int flag, struct strlist *var_str_list)
5622 static const char spclchars[] ALIGN1 = {
5630 CTLBACKQ | CTLQUOTE,
5631 #if ENABLE_ASH_MATH_SUPPORT
5636 const char *reject = spclchars;
5638 int quotes = flag & (EXP_FULL | EXP_CASE); /* do CTLESC */
5639 int breakall = flag & EXP_WORD;
5644 if (!(flag & EXP_VARTILDE)) {
5646 } else if (flag & EXP_VARTILDE2) {
5651 if (flag & EXP_TILDE) {
5657 if (*q == CTLESC && (flag & EXP_QWORD))
5660 p = exptilde(p, q, flag);
5663 startloc = expdest - (char *)stackblock();
5665 length += strcspn(p + length, reject);
5667 if (c && (!(c & 0x80)
5668 #if ENABLE_ASH_MATH_SUPPORT
5672 /* c == '=' || c == ':' || c == CTLENDARI */
5677 expdest = stack_nputstr(p, length, expdest);
5678 newloc = expdest - (char *)stackblock();
5679 if (breakall && !inquotes && newloc > startloc) {
5680 recordregion(startloc, newloc, 0);
5691 if (flag & EXP_VARTILDE2) {
5695 flag |= EXP_VARTILDE2;
5700 * sort of a hack - expand tildes in variable
5701 * assignments (after the first '=' and after ':'s).
5710 case CTLENDVAR: /* ??? */
5713 /* "$@" syntax adherence hack */
5716 !memcmp(p, dolatstr, 4) &&
5717 (p[4] == CTLQUOTEMARK || (
5718 p[4] == CTLENDVAR &&
5719 p[5] == CTLQUOTEMARK
5722 p = evalvar(p + 1, flag, /* var_str_list: */ NULL) + 1;
5725 inquotes = !inquotes;
5738 p = evalvar(p, flag, var_str_list);
5742 case CTLBACKQ|CTLQUOTE:
5743 expbackq(argbackq->n, c, quotes);
5744 argbackq = argbackq->next;
5746 #if ENABLE_ASH_MATH_SUPPORT
5759 scanleft(char *startp, char *rmesc, char *rmescend UNUSED_PARAM, char *str, int quotes,
5762 // This commented out code was added by James Simmons <jsimmons@infradead.org>
5763 // as part of a larger change when he added support for ${var/a/b}.
5764 // However, it broke # and % operators:
5768 //echo ${var#ab} abcdcd abcdcd
5769 //echo ${var##ab} abcdcd abcdcd
5770 //echo ${var#a*b} abcdcd ababcdcd (!)
5771 //echo ${var##a*b} cdcd cdcd
5772 //echo ${var#?} babcdcd ababcdcd (!)
5773 //echo ${var##?} babcdcd babcdcd
5774 //echo ${var#*} ababcdcd babcdcd (!)
5776 //echo ${var%cd} ababcd ababcd
5777 //echo ${var%%cd} ababcd abab (!)
5778 //echo ${var%c*d} ababcd ababcd
5779 //echo ${var%%c*d} abab ababcdcd (!)
5780 //echo ${var%?} ababcdc ababcdc
5781 //echo ${var%%?} ababcdc ababcdcd (!)
5782 //echo ${var%*} ababcdcd ababcdcd
5785 // Commenting it back out helped. Remove it completely if it really
5788 char *loc, *loc2; //, *full;
5794 int match; // = strlen(str);
5795 const char *s = loc2;
5802 match = pmatch(str, s); // this line was deleted
5804 // // chop off end if its '*'
5805 // full = strrchr(str, '*');
5806 // if (full && full != str)
5809 // // If str starts with '*' replace with s.
5810 // if ((*str == '*') && strlen(s) >= match) {
5811 // full = xstrdup(s);
5812 // strncpy(full+strlen(s)-match+1, str+1, match-1);
5814 // full = xstrndup(str, match);
5815 // match = strncmp(s, full, strlen(full));
5819 if (match) // if (!match)
5821 if (quotes && *loc == CTLESC)
5830 scanright(char *startp, char *rmesc, char *rmescend, char *str, int quotes,
5837 for (loc = str - 1, loc2 = rmescend; loc >= startp; loc2--) {
5840 const char *s = loc2;
5845 match = pmatch(str, s);
5852 esc = esclen(startp, loc);
5863 static void varunset(const char *, const char *, const char *, int) NORETURN;
5865 varunset(const char *end, const char *var, const char *umsg, int varflags)
5871 msg = "parameter not set";
5873 if (*end == CTLENDVAR) {
5874 if (varflags & VSNUL)
5879 ash_msg_and_raise_error("%.*s: %s%s", end - var - 1, var, msg, tail);
5882 #if ENABLE_ASH_BASH_COMPAT
5884 parse_sub_pattern(char *arg, int inquotes)
5886 char *idx, *repl = NULL;
5895 /* Only the first '/' seen is our separator */
5902 if (!inquotes && c == '\\' && arg[1] == '\\')
5903 arg++; /* skip both \\, not just first one */
5910 #endif /* ENABLE_ASH_BASH_COMPAT */
5913 subevalvar(char *p, char *str, int strloc, int subtype,
5914 int startloc, int varflags, int quotes, struct strlist *var_str_list)
5916 struct nodelist *saveargbackq = argbackq;
5919 char *rmesc, *rmescend;
5920 USE_ASH_BASH_COMPAT(char *repl = NULL;)
5921 USE_ASH_BASH_COMPAT(char null = '\0';)
5922 USE_ASH_BASH_COMPAT(int pos, len, orig_len;)
5923 int saveherefd = herefd;
5924 int amount, workloc, resetloc;
5926 char *(*scan)(char*, char*, char*, char*, int, int);
5929 argstr(p, (subtype != VSASSIGN && subtype != VSQUESTION) ? EXP_CASE : 0,
5931 STPUTC('\0', expdest);
5932 herefd = saveherefd;
5933 argbackq = saveargbackq;
5934 startp = (char *)stackblock() + startloc;
5938 setvar(str, startp, 0);
5939 amount = startp - expdest;
5940 STADJUST(amount, expdest);
5943 #if ENABLE_ASH_BASH_COMPAT
5945 loc = str = stackblock() + strloc;
5946 // TODO: number() instead? It does error checking...
5948 len = str - startp - 1;
5950 /* *loc != '\0', guaranteed by parser */
5954 /* We must adjust the length by the number of escapes we find. */
5955 for (ptr = startp; ptr < (str - 1); ptr++) {
5956 if(*ptr == CTLESC) {
5964 if (*loc++ == ':') {
5965 // TODO: number() instead? It does error checking...
5969 while (*loc && *loc != ':')
5972 // TODO: number() instead? It does error checking...
5975 if (pos >= orig_len) {
5979 if (len > (orig_len - pos))
5980 len = orig_len - pos;
5982 for (str = startp; pos; str++, pos--) {
5983 if (quotes && *str == CTLESC)
5986 for (loc = startp; len; len--) {
5987 if (quotes && *str == CTLESC)
5992 amount = loc - expdest;
5993 STADJUST(amount, expdest);
5998 varunset(p, str, startp, varflags);
6001 resetloc = expdest - (char *)stackblock();
6003 /* We'll comeback here if we grow the stack while handling
6004 * a VSREPLACE or VSREPLACEALL, since our pointers into the
6005 * stack will need rebasing, and we'll need to remove our work
6008 USE_ASH_BASH_COMPAT(restart:)
6010 amount = expdest - ((char *)stackblock() + resetloc);
6011 STADJUST(-amount, expdest);
6012 startp = (char *)stackblock() + startloc;
6015 rmescend = (char *)stackblock() + strloc;
6017 rmesc = _rmescapes(startp, RMESCAPE_ALLOC | RMESCAPE_GROW);
6018 if (rmesc != startp) {
6020 startp = (char *)stackblock() + startloc;
6024 str = (char *)stackblock() + strloc;
6025 preglob(str, varflags & VSQUOTE, 0);
6026 workloc = expdest - (char *)stackblock();
6028 #if ENABLE_ASH_BASH_COMPAT
6029 if (subtype == VSREPLACE || subtype == VSREPLACEALL) {
6030 char *idx, *end, *restart_detect;
6033 repl = parse_sub_pattern(str, varflags & VSQUOTE);
6038 /* If there's no pattern to match, return the expansion unmolested */
6046 loc = scanright(idx, rmesc, rmescend, str, quotes, 1);
6048 /* No match, advance */
6049 restart_detect = stackblock();
6050 STPUTC(*idx, expdest);
6051 if (quotes && *idx == CTLESC) {
6054 STPUTC(*idx, expdest);
6056 if (stackblock() != restart_detect)
6064 if (subtype == VSREPLACEALL) {
6066 if (quotes && *idx == CTLESC)
6074 for (loc = repl; *loc; loc++) {
6075 restart_detect = stackblock();
6076 STPUTC(*loc, expdest);
6077 if (stackblock() != restart_detect)
6082 if (subtype == VSREPLACE) {
6084 restart_detect = stackblock();
6085 STPUTC(*idx, expdest);
6086 if (stackblock() != restart_detect)
6095 /* We've put the replaced text into a buffer at workloc, now
6096 * move it to the right place and adjust the stack.
6098 startp = stackblock() + startloc;
6099 STPUTC('\0', expdest);
6100 memmove(startp, stackblock() + workloc, len);
6101 startp[len++] = '\0';
6102 amount = expdest - ((char *)stackblock() + startloc + len - 1);
6103 STADJUST(-amount, expdest);
6106 #endif /* ENABLE_ASH_BASH_COMPAT */
6108 subtype -= VSTRIMRIGHT;
6110 if (subtype < 0 || subtype > 7)
6113 /* zero = subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX */
6114 zero = subtype >> 1;
6115 /* VSTRIMLEFT/VSTRIMRIGHTMAX -> scanleft */
6116 scan = (subtype & 1) ^ zero ? scanleft : scanright;
6118 loc = scan(startp, rmesc, rmescend, str, quotes, zero);
6121 memmove(startp, loc, str - loc);
6122 loc = startp + (str - loc) - 1;
6125 amount = loc - expdest;
6126 STADJUST(amount, expdest);
6132 * Add the value of a specialized variable to the stack string.
6135 varvalue(char *name, int varflags, int flags, struct strlist *var_str_list)
6145 int quoted = varflags & VSQUOTE;
6146 int subtype = varflags & VSTYPE;
6147 int quotes = flags & (EXP_FULL | EXP_CASE);
6149 if (quoted && (flags & EXP_FULL))
6150 sep = 1 << CHAR_BIT;
6152 syntax = quoted ? DQSYNTAX : BASESYNTAX;
6161 num = shellparam.nparam;
6171 p = makestrspace(NOPTS, expdest);
6172 for (i = NOPTS - 1; i >= 0; i--) {
6174 USTPUTC(optletters(i), p);
6185 sep = ifsset() ? signed_char2int(ifsval()[0]) : ' ';
6186 if (quotes && (SIT(sep, syntax) == CCTL || SIT(sep, syntax) == CBACK))
6192 while ((p = *ap++)) {
6195 partlen = strlen(p);
6198 if (!(subtype == VSPLUS || subtype == VSLENGTH))
6199 memtodest(p, partlen, syntax, quotes);
6205 if (subtype == VSPLUS || subtype == VSLENGTH) {
6226 // TODO: number() instead? It does error checking...
6228 if (num < 0 || num > shellparam.nparam)
6230 p = num ? shellparam.p[num - 1] : arg0;
6233 /* NB: name has form "VAR=..." */
6235 /* "A=a B=$A" case: var_str_list is a list of "A=a" strings
6236 * which should be considered before we check variables. */
6238 unsigned name_len = (strchrnul(name, '=') - name) + 1;
6242 str = var_str_list->text;
6243 eq = strchr(str, '=');
6244 if (!eq) /* stop at first non-assignment */
6247 if (name_len == (unsigned)(eq - str)
6248 && strncmp(str, name, name_len) == 0) {
6250 /* goto value; - WRONG! */
6251 /* think "A=1 A=2 B=$A" */
6253 var_str_list = var_str_list->next;
6254 } while (var_str_list);
6258 p = lookupvar(name);
6264 if (!(subtype == VSPLUS || subtype == VSLENGTH))
6265 memtodest(p, len, syntax, quotes);
6269 if (subtype == VSPLUS || subtype == VSLENGTH)
6270 STADJUST(-len, expdest);
6275 * Expand a variable, and return a pointer to the next character in the
6279 evalvar(char *p, int flag, struct strlist *var_str_list)
6291 subtype = varflags & VSTYPE;
6292 quoted = varflags & VSQUOTE;
6294 easy = (!quoted || (*var == '@' && shellparam.nparam));
6295 startloc = expdest - (char *)stackblock();
6296 p = strchr(p, '=') + 1;
6299 varlen = varvalue(var, varflags, flag, var_str_list);
6300 if (varflags & VSNUL)
6303 if (subtype == VSPLUS) {
6304 varlen = -1 - varlen;
6308 if (subtype == VSMINUS) {
6312 p, flag | EXP_TILDE |
6313 (quoted ? EXP_QWORD : EXP_WORD),
6323 if (subtype == VSASSIGN || subtype == VSQUESTION) {
6325 if (subevalvar(p, var, /* strloc: */ 0,
6326 subtype, startloc, varflags,
6332 * Remove any recorded regions beyond
6335 removerecordregions(startloc);
6345 if (varlen < 0 && uflag)
6346 varunset(p, var, 0, 0);
6348 if (subtype == VSLENGTH) {
6349 cvtnum(varlen > 0 ? varlen : 0);
6353 if (subtype == VSNORMAL) {
6364 case VSTRIMRIGHTMAX:
6365 #if ENABLE_ASH_BASH_COMPAT
6378 * Terminate the string and start recording the pattern
6381 STPUTC('\0', expdest);
6382 patloc = expdest - (char *)stackblock();
6383 if (0 == subevalvar(p, /* str: */ NULL, patloc, subtype,
6385 /* quotes: */ flag & (EXP_FULL | EXP_CASE),
6388 int amount = expdest - (
6389 (char *)stackblock() + patloc - 1
6391 STADJUST(-amount, expdest);
6393 /* Remove any recorded regions beyond start of variable */
6394 removerecordregions(startloc);
6396 recordregion(startloc, expdest - (char *)stackblock(), quoted);
6400 if (subtype != VSNORMAL) { /* skip to end of alternative */
6406 else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) {
6408 argbackq = argbackq->next;
6409 } else if (c == CTLVAR) {
6410 if ((*p++ & VSTYPE) != VSNORMAL)
6412 } else if (c == CTLENDVAR) {
6422 * Break the argument string into pieces based upon IFS and add the
6423 * strings to the argument list. The regions of the string to be
6424 * searched for IFS characters have been stored by recordregion.
6427 ifsbreakup(char *string, struct arglist *arglist)
6429 struct ifsregion *ifsp;
6434 const char *ifs, *realifs;
6439 if (ifslastp != NULL) {
6442 realifs = ifsset() ? ifsval() : defifs;
6445 p = string + ifsp->begoff;
6446 nulonly = ifsp->nulonly;
6447 ifs = nulonly ? nullstr : realifs;
6449 while (p < string + ifsp->endoff) {
6453 if (!strchr(ifs, *p)) {
6458 ifsspc = (strchr(defifs, *p) != NULL);
6459 /* Ignore IFS whitespace at start */
6460 if (q == start && ifsspc) {
6466 sp = stzalloc(sizeof(*sp));
6468 *arglist->lastp = sp;
6469 arglist->lastp = &sp->next;
6473 if (p >= string + ifsp->endoff) {
6479 if (strchr(ifs, *p) == NULL) {
6483 if (strchr(defifs, *p) == NULL) {
6498 } while (ifsp != NULL);
6507 sp = stzalloc(sizeof(*sp));
6509 *arglist->lastp = sp;
6510 arglist->lastp = &sp->next;
6516 struct ifsregion *p;
6521 struct ifsregion *ifsp;
6527 ifsfirst.next = NULL;
6532 * Add a file name to the list.
6535 addfname(const char *name)
6539 sp = stzalloc(sizeof(*sp));
6540 sp->text = ststrdup(name);
6542 exparg.lastp = &sp->next;
6545 static char *expdir;
6548 * Do metacharacter (i.e. *, ?, [...]) expansion.
6551 expmeta(char *enddir, char *name)
6566 for (p = name; *p; p++) {
6567 if (*p == '*' || *p == '?')
6569 else if (*p == '[') {
6576 if (*q == '/' || *q == '\0')
6583 } else if (*p == '\\')
6585 else if (*p == '/') {
6592 if (metaflag == 0) { /* we've reached the end of the file name */
6593 if (enddir != expdir)
6601 if (metaflag == 0 || lstat(expdir, &statb) >= 0)
6612 } while (p < start);
6614 if (enddir == expdir) {
6616 } else if (enddir == expdir + 1 && *expdir == '/') {
6625 if (enddir != expdir)
6627 if (*endname == 0) {
6639 while (!intpending && (dp = readdir(dirp)) != NULL) {
6640 if (dp->d_name[0] == '.' && !matchdot)
6642 if (pmatch(start, dp->d_name)) {
6644 strcpy(enddir, dp->d_name);
6647 for (p = enddir, cp = dp->d_name; (*p++ = *cp++) != '\0';)
6650 expmeta(p, endname);
6659 static struct strlist *
6660 msort(struct strlist *list, int len)
6662 struct strlist *p, *q = NULL;
6663 struct strlist **lpp;
6671 for (n = half; --n >= 0;) {
6675 q->next = NULL; /* terminate first half of list */
6676 q = msort(list, half); /* sort first half of list */
6677 p = msort(p, len - half); /* sort second half */
6680 #if ENABLE_LOCALE_SUPPORT
6681 if (strcoll(p->text, q->text) < 0)
6683 if (strcmp(p->text, q->text) < 0)
6707 * Sort the results of file name expansion. It calculates the number of
6708 * strings to sort and then calls msort (short for merge sort) to do the
6711 static struct strlist *
6712 expsort(struct strlist *str)
6718 for (sp = str; sp; sp = sp->next)
6720 return msort(str, len);
6724 expandmeta(struct strlist *str /*, int flag*/)
6726 static const char metachars[] ALIGN1 = {
6729 /* TODO - EXP_REDIR */
6732 struct strlist **savelastp;
6738 if (!strpbrk(str->text, metachars))
6740 savelastp = exparg.lastp;
6743 p = preglob(str->text, 0, RMESCAPE_ALLOC | RMESCAPE_HEAP);
6745 int i = strlen(str->text);
6746 expdir = ckmalloc(i < 2048 ? 2048 : i); /* XXX */
6754 if (exparg.lastp == savelastp) {
6759 *exparg.lastp = str;
6760 rmescapes(str->text);
6761 exparg.lastp = &str->next;
6763 *exparg.lastp = NULL;
6764 *savelastp = sp = expsort(*savelastp);
6765 while (sp->next != NULL)
6767 exparg.lastp = &sp->next;
6774 * Perform variable substitution and command substitution on an argument,
6775 * placing the resulting list of arguments in arglist. If EXP_FULL is true,
6776 * perform splitting and file name expansion. When arglist is NULL, perform
6777 * here document expansion.
6780 expandarg(union node *arg, struct arglist *arglist, int flag)
6785 argbackq = arg->narg.backquote;
6786 STARTSTACKSTR(expdest);
6787 ifsfirst.next = NULL;
6789 argstr(arg->narg.text, flag,
6790 /* var_str_list: */ arglist ? arglist->list : NULL);
6791 p = _STPUTC('\0', expdest);
6793 if (arglist == NULL) {
6794 return; /* here document expanded */
6796 p = grabstackstr(p);
6797 exparg.lastp = &exparg.list;
6801 if (flag & EXP_FULL) {
6802 ifsbreakup(p, &exparg);
6803 *exparg.lastp = NULL;
6804 exparg.lastp = &exparg.list;
6805 expandmeta(exparg.list /*, flag*/);
6807 if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */
6809 sp = stzalloc(sizeof(*sp));
6812 exparg.lastp = &sp->next;
6816 *exparg.lastp = NULL;
6818 *arglist->lastp = exparg.list;
6819 arglist->lastp = exparg.lastp;
6824 * Expand shell variables and backquotes inside a here document.
6827 expandhere(union node *arg, int fd)
6830 expandarg(arg, (struct arglist *)NULL, 0);
6831 full_write(fd, stackblock(), expdest - (char *)stackblock());
6835 * Returns true if the pattern matches the string.
6838 patmatch(char *pattern, const char *string)
6840 return pmatch(preglob(pattern, 0, 0), string);
6844 * See if a pattern matches in a case statement.
6847 casematch(union node *pattern, char *val)
6849 struct stackmark smark;
6852 setstackmark(&smark);
6853 argbackq = pattern->narg.backquote;
6854 STARTSTACKSTR(expdest);
6856 argstr(pattern->narg.text, EXP_TILDE | EXP_CASE,
6857 /* var_str_list: */ NULL);
6858 STACKSTRNUL(expdest);
6859 result = patmatch(stackblock(), val);
6860 popstackmark(&smark);
6865 /* ============ find_command */
6869 int (*builtin)(int, char **);
6870 /* unsigned flags; */
6872 #define IS_BUILTIN_SPECIAL(b) ((b)->name[0] & 1)
6873 /* "regular" builtins always take precedence over commands,
6874 * regardless of PATH=....%builtin... position */
6875 #define IS_BUILTIN_REGULAR(b) ((b)->name[0] & 2)
6876 #define IS_BUILTIN_ASSIGN(b) ((b)->name[0] & 4)
6879 smallint cmdtype; /* CMDxxx */
6882 /* index >= 0 for commands without path (slashes) */
6883 /* (TODO: what exactly does the value mean? PATH position?) */
6884 /* index == -1 for commands with slashes */
6885 /* index == (-2 - applet_no) for NOFORK applets */
6886 const struct builtincmd *cmd;
6887 struct funcnode *func;
6890 /* values of cmdtype */
6891 #define CMDUNKNOWN -1 /* no entry in table for command */
6892 #define CMDNORMAL 0 /* command is an executable program */
6893 #define CMDFUNCTION 1 /* command is a shell function */
6894 #define CMDBUILTIN 2 /* command is a shell builtin */
6896 /* action to find_command() */
6897 #define DO_ERR 0x01 /* prints errors */
6898 #define DO_ABS 0x02 /* checks absolute paths */
6899 #define DO_NOFUNC 0x04 /* don't return shell functions, for command */
6900 #define DO_ALTPATH 0x08 /* using alternate path */
6901 #define DO_ALTBLTIN 0x20 /* %builtin in alt. path */
6903 static void find_command(char *, struct cmdentry *, int, const char *);
6906 /* ============ Hashing commands */
6909 * When commands are first encountered, they are entered in a hash table.
6910 * This ensures that a full path search will not have to be done for them
6911 * on each invocation.
6913 * We should investigate converting to a linear search, even though that
6914 * would make the command name "hash" a misnomer.
6918 struct tblentry *next; /* next entry in hash chain */
6919 union param param; /* definition of builtin function */
6920 smallint cmdtype; /* CMDxxx */
6921 char rehash; /* if set, cd done since entry created */
6922 char cmdname[1]; /* name of command */
6925 static struct tblentry **cmdtable;
6926 #define INIT_G_cmdtable() do { \
6927 cmdtable = xzalloc(CMDTABLESIZE * sizeof(cmdtable[0])); \
6930 static int builtinloc = -1; /* index in path of %builtin, or -1 */
6934 tryexec(USE_FEATURE_SH_STANDALONE(int applet_no,) char *cmd, char **argv, char **envp)
6938 #if ENABLE_FEATURE_SH_STANDALONE
6939 if (applet_no >= 0) {
6940 if (APPLET_IS_NOEXEC(applet_no))
6941 run_applet_no_and_exit(applet_no, argv);
6942 /* re-exec ourselves with the new arguments */
6943 execve(bb_busybox_exec_path, argv, envp);
6944 /* If they called chroot or otherwise made the binary no longer
6945 * executable, fall through */
6952 execve(cmd, argv, envp);
6953 } while (errno == EINTR);
6955 execve(cmd, argv, envp);
6961 if (errno == ENOEXEC) {
6965 for (ap = argv; *ap; ap++)
6967 ap = new = ckmalloc((ap - argv + 2) * sizeof(ap[0]));
6969 ap[0] = cmd = (char *)DEFAULT_SHELL;
6972 while ((*ap++ = *argv++) != NULL)
6981 * Exec a program. Never returns. If you change this routine, you may
6982 * have to change the find_command routine as well.
6984 static void shellexec(char **, const char *, int) NORETURN;
6986 shellexec(char **argv, const char *path, int idx)
6992 #if ENABLE_FEATURE_SH_STANDALONE
6997 envp = listvars(VEXPORT, VUNSET, 0);
6998 if (strchr(argv[0], '/') != NULL
6999 #if ENABLE_FEATURE_SH_STANDALONE
7000 || (applet_no = find_applet_by_name(argv[0])) >= 0
7003 tryexec(USE_FEATURE_SH_STANDALONE(applet_no,) argv[0], argv, envp);
7007 while ((cmdname = padvance(&path, argv[0])) != NULL) {
7008 if (--idx < 0 && pathopt == NULL) {
7009 tryexec(USE_FEATURE_SH_STANDALONE(-1,) cmdname, argv, envp);
7010 if (errno != ENOENT && errno != ENOTDIR)
7017 /* Map to POSIX errors */
7029 exitstatus = exerrno;
7030 TRACE(("shellexec failed for %s, errno %d, suppressint %d\n",
7031 argv[0], e, suppressint));
7032 ash_msg_and_raise(EXEXEC, "%s: %s", argv[0], errmsg(e, "not found"));
7037 printentry(struct tblentry *cmdp)
7043 idx = cmdp->param.index;
7046 name = padvance(&path, cmdp->cmdname);
7048 } while (--idx >= 0);
7049 out1fmt("%s%s\n", name, (cmdp->rehash ? "*" : nullstr));
7053 * Clear out command entries. The argument specifies the first entry in
7054 * PATH which has changed.
7057 clearcmdentry(int firstchange)
7059 struct tblentry **tblp;
7060 struct tblentry **pp;
7061 struct tblentry *cmdp;
7064 for (tblp = cmdtable; tblp < &cmdtable[CMDTABLESIZE]; tblp++) {
7066 while ((cmdp = *pp) != NULL) {
7067 if ((cmdp->cmdtype == CMDNORMAL &&
7068 cmdp->param.index >= firstchange)
7069 || (cmdp->cmdtype == CMDBUILTIN &&
7070 builtinloc >= firstchange)
7083 * Locate a command in the command hash table. If "add" is nonzero,
7084 * add the command to the table if it is not already present. The
7085 * variable "lastcmdentry" is set to point to the address of the link
7086 * pointing to the entry, so that delete_cmd_entry can delete the
7089 * Interrupts must be off if called with add != 0.
7091 static struct tblentry **lastcmdentry;
7093 static struct tblentry *
7094 cmdlookup(const char *name, int add)
7096 unsigned int hashval;
7098 struct tblentry *cmdp;
7099 struct tblentry **pp;
7102 hashval = (unsigned char)*p << 4;
7104 hashval += (unsigned char)*p++;
7106 pp = &cmdtable[hashval % CMDTABLESIZE];
7107 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7108 if (strcmp(cmdp->cmdname, name) == 0)
7112 if (add && cmdp == NULL) {
7113 cmdp = *pp = ckzalloc(sizeof(struct tblentry)
7115 /* + 1 - already done because
7116 * tblentry::cmdname is char[1] */);
7117 /*cmdp->next = NULL; - ckzalloc did it */
7118 cmdp->cmdtype = CMDUNKNOWN;
7119 strcpy(cmdp->cmdname, name);
7126 * Delete the command entry returned on the last lookup.
7129 delete_cmd_entry(void)
7131 struct tblentry *cmdp;
7134 cmdp = *lastcmdentry;
7135 *lastcmdentry = cmdp->next;
7136 if (cmdp->cmdtype == CMDFUNCTION)
7137 freefunc(cmdp->param.func);
7143 * Add a new command entry, replacing any existing command entry for
7144 * the same name - except special builtins.
7147 addcmdentry(char *name, struct cmdentry *entry)
7149 struct tblentry *cmdp;
7151 cmdp = cmdlookup(name, 1);
7152 if (cmdp->cmdtype == CMDFUNCTION) {
7153 freefunc(cmdp->param.func);
7155 cmdp->cmdtype = entry->cmdtype;
7156 cmdp->param = entry->u;
7161 hashcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
7163 struct tblentry **pp;
7164 struct tblentry *cmdp;
7166 struct cmdentry entry;
7169 if (nextopt("r") != '\0') {
7174 if (*argptr == NULL) {
7175 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
7176 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7177 if (cmdp->cmdtype == CMDNORMAL)
7185 while ((name = *argptr) != NULL) {
7186 cmdp = cmdlookup(name, 0);
7188 && (cmdp->cmdtype == CMDNORMAL
7189 || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))
7193 find_command(name, &entry, DO_ERR, pathval());
7194 if (entry.cmdtype == CMDUNKNOWN)
7202 * Called when a cd is done. Marks all commands so the next time they
7203 * are executed they will be rehashed.
7208 struct tblentry **pp;
7209 struct tblentry *cmdp;
7211 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
7212 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7213 if (cmdp->cmdtype == CMDNORMAL
7214 || (cmdp->cmdtype == CMDBUILTIN
7215 && !IS_BUILTIN_REGULAR(cmdp->param.cmd)
7225 * Fix command hash table when PATH changed.
7226 * Called before PATH is changed. The argument is the new value of PATH;
7227 * pathval() still returns the old value at this point.
7228 * Called with interrupts off.
7231 changepath(const char *new)
7239 firstchange = 9999; /* assume no change */
7245 if ((*old == '\0' && *new == ':')
7246 || (*old == ':' && *new == '\0'))
7248 old = new; /* ignore subsequent differences */
7252 if (*new == '%' && idx_bltin < 0 && prefix(new + 1, "builtin"))
7258 if (builtinloc < 0 && idx_bltin >= 0)
7259 builtinloc = idx_bltin; /* zap builtins */
7260 if (builtinloc >= 0 && idx_bltin < 0)
7262 clearcmdentry(firstchange);
7263 builtinloc = idx_bltin;
7278 #define TENDBQUOTE 12
7295 typedef smallint token_id_t;
7297 /* first char is indicating which tokens mark the end of a list */
7298 static const char *const tokname_array[] = {
7312 #define KWDOFFSET 13
7313 /* the following are keywords */
7335 static char buf[16];
7338 //if (tok < TSEMI) return tokname_array[tok] + 1;
7339 //sprintf(buf, "\"%s\"", tokname_array[tok] + 1);
7344 sprintf(buf + (tok >= TSEMI), "%s%c",
7345 tokname_array[tok] + 1, (tok >= TSEMI ? '"' : 0));
7349 /* Wrapper around strcmp for qsort/bsearch/... */
7351 pstrcmp(const void *a, const void *b)
7353 return strcmp((char*) a, (*(char**) b) + 1);
7356 static const char *const *
7357 findkwd(const char *s)
7359 return bsearch(s, tokname_array + KWDOFFSET,
7360 ARRAY_SIZE(tokname_array) - KWDOFFSET,
7361 sizeof(tokname_array[0]), pstrcmp);
7365 * Locate and print what a word is...
7368 describe_command(char *command, int describe_command_verbose)
7370 struct cmdentry entry;
7371 struct tblentry *cmdp;
7372 #if ENABLE_ASH_ALIAS
7373 const struct alias *ap;
7375 const char *path = pathval();
7377 if (describe_command_verbose) {
7381 /* First look at the keywords */
7382 if (findkwd(command)) {
7383 out1str(describe_command_verbose ? " is a shell keyword" : command);
7387 #if ENABLE_ASH_ALIAS
7388 /* Then look at the aliases */
7389 ap = lookupalias(command, 0);
7391 if (!describe_command_verbose) {
7396 out1fmt(" is an alias for %s", ap->val);
7400 /* Then check if it is a tracked alias */
7401 cmdp = cmdlookup(command, 0);
7403 entry.cmdtype = cmdp->cmdtype;
7404 entry.u = cmdp->param;
7406 /* Finally use brute force */
7407 find_command(command, &entry, DO_ABS, path);
7410 switch (entry.cmdtype) {
7412 int j = entry.u.index;
7418 p = padvance(&path, command);
7422 if (describe_command_verbose) {
7424 (cmdp ? " a tracked alias for" : nullstr), p
7433 if (describe_command_verbose) {
7434 out1str(" is a shell function");
7441 if (describe_command_verbose) {
7442 out1fmt(" is a %sshell builtin",
7443 IS_BUILTIN_SPECIAL(entry.u.cmd) ?
7444 "special " : nullstr
7452 if (describe_command_verbose) {
7453 out1str(": not found\n");
7458 outstr("\n", stdout);
7463 typecmd(int argc UNUSED_PARAM, char **argv)
7469 /* type -p ... ? (we don't bother checking for 'p') */
7470 if (argv[1] && argv[1][0] == '-') {
7475 err |= describe_command(argv[i++], verbose);
7480 #if ENABLE_ASH_CMDCMD
7482 commandcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
7490 while ((c = nextopt("pvV")) != '\0')
7492 verify |= VERIFY_VERBOSE;
7494 verify |= VERIFY_BRIEF;
7499 /* Mimic bash: just "command -v" doesn't complain, it's a nop */
7500 if (verify && (*argptr != NULL)) {
7501 return describe_command(*argptr, verify - VERIFY_BRIEF);
7509 /* ============ eval.c */
7511 static int funcblocksize; /* size of structures in function */
7512 static int funcstringsize; /* size of strings in node */
7513 static void *funcblock; /* block to allocate function from */
7514 static char *funcstring; /* block to allocate strings from */
7516 /* flags in argument to evaltree */
7517 #define EV_EXIT 01 /* exit after evaluating tree */
7518 #define EV_TESTED 02 /* exit status is checked; ignore -e flag */
7519 #define EV_BACKCMD 04 /* command executing within back quotes */
7521 static const short nodesize[26] = {
7522 SHELL_ALIGN(sizeof(struct ncmd)),
7523 SHELL_ALIGN(sizeof(struct npipe)),
7524 SHELL_ALIGN(sizeof(struct nredir)),
7525 SHELL_ALIGN(sizeof(struct nredir)),
7526 SHELL_ALIGN(sizeof(struct nredir)),
7527 SHELL_ALIGN(sizeof(struct nbinary)),
7528 SHELL_ALIGN(sizeof(struct nbinary)),
7529 SHELL_ALIGN(sizeof(struct nbinary)),
7530 SHELL_ALIGN(sizeof(struct nif)),
7531 SHELL_ALIGN(sizeof(struct nbinary)),
7532 SHELL_ALIGN(sizeof(struct nbinary)),
7533 SHELL_ALIGN(sizeof(struct nfor)),
7534 SHELL_ALIGN(sizeof(struct ncase)),
7535 SHELL_ALIGN(sizeof(struct nclist)),
7536 SHELL_ALIGN(sizeof(struct narg)),
7537 SHELL_ALIGN(sizeof(struct narg)),
7538 SHELL_ALIGN(sizeof(struct nfile)),
7539 SHELL_ALIGN(sizeof(struct nfile)),
7540 SHELL_ALIGN(sizeof(struct nfile)),
7541 SHELL_ALIGN(sizeof(struct nfile)),
7542 SHELL_ALIGN(sizeof(struct nfile)),
7543 SHELL_ALIGN(sizeof(struct ndup)),
7544 SHELL_ALIGN(sizeof(struct ndup)),
7545 SHELL_ALIGN(sizeof(struct nhere)),
7546 SHELL_ALIGN(sizeof(struct nhere)),
7547 SHELL_ALIGN(sizeof(struct nnot)),
7550 static void calcsize(union node *n);
7553 sizenodelist(struct nodelist *lp)
7556 funcblocksize += SHELL_ALIGN(sizeof(struct nodelist));
7563 calcsize(union node *n)
7567 funcblocksize += nodesize[n->type];
7570 calcsize(n->ncmd.redirect);
7571 calcsize(n->ncmd.args);
7572 calcsize(n->ncmd.assign);
7575 sizenodelist(n->npipe.cmdlist);
7580 calcsize(n->nredir.redirect);
7581 calcsize(n->nredir.n);
7588 calcsize(n->nbinary.ch2);
7589 calcsize(n->nbinary.ch1);
7592 calcsize(n->nif.elsepart);
7593 calcsize(n->nif.ifpart);
7594 calcsize(n->nif.test);
7597 funcstringsize += strlen(n->nfor.var) + 1;
7598 calcsize(n->nfor.body);
7599 calcsize(n->nfor.args);
7602 calcsize(n->ncase.cases);
7603 calcsize(n->ncase.expr);
7606 calcsize(n->nclist.body);
7607 calcsize(n->nclist.pattern);
7608 calcsize(n->nclist.next);
7612 sizenodelist(n->narg.backquote);
7613 funcstringsize += strlen(n->narg.text) + 1;
7614 calcsize(n->narg.next);
7621 calcsize(n->nfile.fname);
7622 calcsize(n->nfile.next);
7626 calcsize(n->ndup.vname);
7627 calcsize(n->ndup.next);
7631 calcsize(n->nhere.doc);
7632 calcsize(n->nhere.next);
7635 calcsize(n->nnot.com);
7641 nodeckstrdup(char *s)
7643 char *rtn = funcstring;
7645 strcpy(funcstring, s);
7646 funcstring += strlen(s) + 1;
7650 static union node *copynode(union node *);
7652 static struct nodelist *
7653 copynodelist(struct nodelist *lp)
7655 struct nodelist *start;
7656 struct nodelist **lpp;
7661 funcblock = (char *) funcblock + SHELL_ALIGN(sizeof(struct nodelist));
7662 (*lpp)->n = copynode(lp->n);
7664 lpp = &(*lpp)->next;
7671 copynode(union node *n)
7678 funcblock = (char *) funcblock + nodesize[n->type];
7682 new->ncmd.redirect = copynode(n->ncmd.redirect);
7683 new->ncmd.args = copynode(n->ncmd.args);
7684 new->ncmd.assign = copynode(n->ncmd.assign);
7687 new->npipe.cmdlist = copynodelist(n->npipe.cmdlist);
7688 new->npipe.pipe_backgnd = n->npipe.pipe_backgnd;
7693 new->nredir.redirect = copynode(n->nredir.redirect);
7694 new->nredir.n = copynode(n->nredir.n);
7701 new->nbinary.ch2 = copynode(n->nbinary.ch2);
7702 new->nbinary.ch1 = copynode(n->nbinary.ch1);
7705 new->nif.elsepart = copynode(n->nif.elsepart);
7706 new->nif.ifpart = copynode(n->nif.ifpart);
7707 new->nif.test = copynode(n->nif.test);
7710 new->nfor.var = nodeckstrdup(n->nfor.var);
7711 new->nfor.body = copynode(n->nfor.body);
7712 new->nfor.args = copynode(n->nfor.args);
7715 new->ncase.cases = copynode(n->ncase.cases);
7716 new->ncase.expr = copynode(n->ncase.expr);
7719 new->nclist.body = copynode(n->nclist.body);
7720 new->nclist.pattern = copynode(n->nclist.pattern);
7721 new->nclist.next = copynode(n->nclist.next);
7725 new->narg.backquote = copynodelist(n->narg.backquote);
7726 new->narg.text = nodeckstrdup(n->narg.text);
7727 new->narg.next = copynode(n->narg.next);
7734 new->nfile.fname = copynode(n->nfile.fname);
7735 new->nfile.fd = n->nfile.fd;
7736 new->nfile.next = copynode(n->nfile.next);
7740 new->ndup.vname = copynode(n->ndup.vname);
7741 new->ndup.dupfd = n->ndup.dupfd;
7742 new->ndup.fd = n->ndup.fd;
7743 new->ndup.next = copynode(n->ndup.next);
7747 new->nhere.doc = copynode(n->nhere.doc);
7748 new->nhere.fd = n->nhere.fd;
7749 new->nhere.next = copynode(n->nhere.next);
7752 new->nnot.com = copynode(n->nnot.com);
7755 new->type = n->type;
7760 * Make a copy of a parse tree.
7762 static struct funcnode *
7763 copyfunc(union node *n)
7768 funcblocksize = offsetof(struct funcnode, n);
7771 blocksize = funcblocksize;
7772 f = ckmalloc(blocksize + funcstringsize);
7773 funcblock = (char *) f + offsetof(struct funcnode, n);
7774 funcstring = (char *) f + blocksize;
7781 * Define a shell function.
7784 defun(char *name, union node *func)
7786 struct cmdentry entry;
7789 entry.cmdtype = CMDFUNCTION;
7790 entry.u.func = copyfunc(func);
7791 addcmdentry(name, &entry);
7795 static int evalskip; /* set if we are skipping commands */
7796 /* reasons for skipping commands (see comment on breakcmd routine) */
7797 #define SKIPBREAK (1 << 0)
7798 #define SKIPCONT (1 << 1)
7799 #define SKIPFUNC (1 << 2)
7800 #define SKIPFILE (1 << 3)
7801 #define SKIPEVAL (1 << 4)
7802 static int skipcount; /* number of levels to skip */
7803 static int funcnest; /* depth of function calls */
7804 static int loopnest; /* current loop nesting level */
7806 /* forward decl way out to parsing code - dotrap needs it */
7807 static int evalstring(char *s, int mask);
7810 * Called to execute a trap. Perhaps we should avoid entering new trap
7811 * handlers while we are executing a trap handler.
7822 savestatus = exitstatus;
7826 for (i = 0, q = gotsig; i < NSIG - 1; i++, q++) {
7834 skip = evalstring(p, SKIPEVAL);
7835 exitstatus = savestatus;
7843 /* forward declarations - evaluation is fairly recursive business... */
7844 static void evalloop(union node *, int);
7845 static void evalfor(union node *, int);
7846 static void evalcase(union node *, int);
7847 static void evalsubshell(union node *, int);
7848 static void expredir(union node *);
7849 static void evalpipe(union node *, int);
7850 static void evalcommand(union node *, int);
7851 static int evalbltin(const struct builtincmd *, int, char **);
7852 static void prehash(union node *);
7855 * Evaluate a parse tree. The value is left in the global variable
7859 evaltree(union node *n, int flags)
7862 void (*evalfn)(union node *, int);
7866 TRACE(("evaltree(NULL) called\n"));
7869 TRACE(("pid %d, evaltree(%p: %d, %d) called\n",
7870 getpid(), n, n->type, flags));
7874 out1fmt("Node type = %d\n", n->type);
7879 evaltree(n->nnot.com, EV_TESTED);
7880 status = !exitstatus;
7883 expredir(n->nredir.redirect);
7884 status = redirectsafe(n->nredir.redirect, REDIR_PUSH);
7886 evaltree(n->nredir.n, flags & EV_TESTED);
7887 status = exitstatus;
7892 evalfn = evalcommand;
7894 if (eflag && !(flags & EV_TESTED))
7906 evalfn = evalsubshell;
7918 #error NAND + 1 != NOR
7920 #if NOR + 1 != NSEMI
7921 #error NOR + 1 != NSEMI
7923 isor = n->type - NAND;
7926 (flags | ((isor >> 1) - 1)) & EV_TESTED
7928 if (!exitstatus == isor)
7940 evaltree(n->nif.test, EV_TESTED);
7943 if (exitstatus == 0) {
7946 } else if (n->nif.elsepart) {
7947 n = n->nif.elsepart;
7952 defun(n->narg.text, n->narg.next);
7956 exitstatus = status;
7960 if ((checkexit & exitstatus))
7961 evalskip |= SKIPEVAL;
7962 else if (pendingsig && dotrap())
7965 if (flags & EV_EXIT) {
7967 raise_exception(EXEXIT);
7971 #if !defined(__alpha__) || (defined(__GNUC__) && __GNUC__ >= 3)
7974 void evaltreenr(union node *, int) __attribute__ ((alias("evaltree"),__noreturn__));
7977 evalloop(union node *n, int flags)
7987 evaltree(n->nbinary.ch1, EV_TESTED);
7990 if (evalskip == SKIPCONT && --skipcount <= 0) {
7994 if (evalskip == SKIPBREAK && --skipcount <= 0)
7999 if (n->type != NWHILE)
8003 evaltree(n->nbinary.ch2, flags);
8004 status = exitstatus;
8009 exitstatus = status;
8013 evalfor(union node *n, int flags)
8015 struct arglist arglist;
8018 struct stackmark smark;
8020 setstackmark(&smark);
8021 arglist.list = NULL;
8022 arglist.lastp = &arglist.list;
8023 for (argp = n->nfor.args; argp; argp = argp->narg.next) {
8024 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE | EXP_RECORD);
8029 *arglist.lastp = NULL;
8034 for (sp = arglist.list; sp; sp = sp->next) {
8035 setvar(n->nfor.var, sp->text, 0);
8036 evaltree(n->nfor.body, flags);
8038 if (evalskip == SKIPCONT && --skipcount <= 0) {
8042 if (evalskip == SKIPBREAK && --skipcount <= 0)
8049 popstackmark(&smark);
8053 evalcase(union node *n, int flags)
8057 struct arglist arglist;
8058 struct stackmark smark;
8060 setstackmark(&smark);
8061 arglist.list = NULL;
8062 arglist.lastp = &arglist.list;
8063 expandarg(n->ncase.expr, &arglist, EXP_TILDE);
8065 for (cp = n->ncase.cases; cp && evalskip == 0; cp = cp->nclist.next) {
8066 for (patp = cp->nclist.pattern; patp; patp = patp->narg.next) {
8067 if (casematch(patp, arglist.list->text)) {
8068 if (evalskip == 0) {
8069 evaltree(cp->nclist.body, flags);
8076 popstackmark(&smark);
8080 * Kick off a subshell to evaluate a tree.
8083 evalsubshell(union node *n, int flags)
8086 int backgnd = (n->type == NBACKGND);
8089 expredir(n->nredir.redirect);
8090 if (!backgnd && flags & EV_EXIT && !trap[0])
8093 jp = makejob(/*n,*/ 1);
8094 if (forkshell(jp, n, backgnd) == 0) {
8098 flags &=~ EV_TESTED;
8100 redirect(n->nredir.redirect, 0);
8101 evaltreenr(n->nredir.n, flags);
8106 status = waitforjob(jp);
8107 exitstatus = status;
8112 * Compute the names of the files in a redirection list.
8114 static void fixredir(union node *, const char *, int);
8116 expredir(union node *n)
8120 for (redir = n; redir; redir = redir->nfile.next) {
8124 fn.lastp = &fn.list;
8125 switch (redir->type) {
8131 expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR);
8132 redir->nfile.expfname = fn.list->text;
8136 if (redir->ndup.vname) {
8137 expandarg(redir->ndup.vname, &fn, EXP_FULL | EXP_TILDE);
8138 if (fn.list == NULL)
8139 ash_msg_and_raise_error("redir error");
8140 fixredir(redir, fn.list->text, 1);
8148 * Evaluate a pipeline. All the processes in the pipeline are children
8149 * of the process creating the pipeline. (This differs from some versions
8150 * of the shell, which make the last process in a pipeline the parent
8154 evalpipe(union node *n, int flags)
8157 struct nodelist *lp;
8162 TRACE(("evalpipe(0x%lx) called\n", (long)n));
8164 for (lp = n->npipe.cmdlist; lp; lp = lp->next)
8168 jp = makejob(/*n,*/ pipelen);
8170 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
8174 if (pipe(pip) < 0) {
8176 ash_msg_and_raise_error("pipe call failed");
8179 if (forkshell(jp, lp->n, n->npipe.pipe_backgnd) == 0) {
8192 evaltreenr(lp->n, flags);
8200 if (n->npipe.pipe_backgnd == 0) {
8201 exitstatus = waitforjob(jp);
8202 TRACE(("evalpipe: job done exit status %d\n", exitstatus));
8208 * Controls whether the shell is interactive or not.
8211 setinteractive(int on)
8213 static smallint is_interactive;
8215 if (++on == is_interactive)
8217 is_interactive = on;
8221 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
8222 if (is_interactive > 1) {
8223 /* Looks like they want an interactive shell */
8224 static smallint did_banner;
8229 "%s built-in shell (ash)\n"
8230 "Enter 'help' for a list of built-in commands."
8245 setinteractive(iflag);
8247 #if ENABLE_FEATURE_EDITING_VI
8249 line_input_state->flags |= VI_MODE;
8251 line_input_state->flags &= ~VI_MODE;
8253 viflag = 0; /* forcibly keep the option off */
8257 static struct localvar *localvars;
8260 * Called after a function returns.
8261 * Interrupts must be off.
8266 struct localvar *lvp;
8269 while ((lvp = localvars) != NULL) {
8270 localvars = lvp->next;
8272 TRACE(("poplocalvar %s", vp ? vp->text : "-"));
8273 if (vp == NULL) { /* $- saved */
8274 memcpy(optlist, lvp->text, sizeof(optlist));
8275 free((char*)lvp->text);
8277 } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) {
8281 (*vp->func)(strchrnul(lvp->text, '=') + 1);
8282 if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
8283 free((char*)vp->text);
8284 vp->flags = lvp->flags;
8285 vp->text = lvp->text;
8292 evalfun(struct funcnode *func, int argc, char **argv, int flags)
8294 volatile struct shparam saveparam;
8295 struct localvar *volatile savelocalvars;
8296 struct jmploc *volatile savehandler;
8297 struct jmploc jmploc;
8300 saveparam = shellparam;
8301 savelocalvars = localvars;
8302 e = setjmp(jmploc.loc);
8307 savehandler = exception_handler;
8308 exception_handler = &jmploc;
8310 shellparam.malloced = 0;
8314 shellparam.nparam = argc - 1;
8315 shellparam.p = argv + 1;
8316 #if ENABLE_ASH_GETOPTS
8317 shellparam.optind = 1;
8318 shellparam.optoff = -1;
8320 evaltree(&func->n, flags & EV_TESTED);
8326 localvars = savelocalvars;
8327 freeparam(&shellparam);
8328 shellparam = saveparam;
8329 exception_handler = savehandler;
8331 evalskip &= ~SKIPFUNC;
8335 #if ENABLE_ASH_CMDCMD
8337 parse_command_args(char **argv, const char **path)
8350 if (c == '-' && !*cp) {
8357 *path = bb_default_path;
8360 /* run 'typecmd' for other options */
8371 * Make a variable a local variable. When a variable is made local, it's
8372 * value and flags are saved in a localvar structure. The saved values
8373 * will be restored when the shell function returns. We handle the name
8374 * "-" as a special case.
8379 struct localvar *lvp;
8384 lvp = ckzalloc(sizeof(struct localvar));
8385 if (LONE_DASH(name)) {
8387 p = ckmalloc(sizeof(optlist));
8388 lvp->text = memcpy(p, optlist, sizeof(optlist));
8393 vpp = hashvar(name);
8394 vp = *findvar(vpp, name);
8395 eq = strchr(name, '=');
8398 setvareq(name, VSTRFIXED);
8400 setvar(name, NULL, VSTRFIXED);
8401 vp = *vpp; /* the new variable */
8402 lvp->flags = VUNSET;
8404 lvp->text = vp->text;
8405 lvp->flags = vp->flags;
8406 vp->flags |= VSTRFIXED|VTEXTFIXED;
8412 lvp->next = localvars;
8418 * The "local" command.
8421 localcmd(int argc UNUSED_PARAM, char **argv)
8426 while ((name = *argv++) != NULL) {
8433 falsecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
8439 truecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
8445 execcmd(int argc UNUSED_PARAM, char **argv)
8448 iflag = 0; /* exit on error */
8451 shellexec(argv + 1, pathval(), 0);
8457 * The return command.
8460 returncmd(int argc UNUSED_PARAM, char **argv)
8463 * If called outside a function, do what ksh does;
8464 * skip the rest of the file.
8466 evalskip = funcnest ? SKIPFUNC : SKIPFILE;
8467 return argv[1] ? number(argv[1]) : exitstatus;
8470 /* Forward declarations for builtintab[] */
8471 static int breakcmd(int, char **);
8472 static int dotcmd(int, char **);
8473 static int evalcmd(int, char **);
8474 static int exitcmd(int, char **);
8475 static int exportcmd(int, char **);
8476 #if ENABLE_ASH_GETOPTS
8477 static int getoptscmd(int, char **);
8479 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
8480 static int helpcmd(int, char **);
8482 #if ENABLE_ASH_MATH_SUPPORT
8483 static int letcmd(int, char **);
8485 static int readcmd(int, char **);
8486 static int setcmd(int, char **);
8487 static int shiftcmd(int, char **);
8488 static int timescmd(int, char **);
8489 static int trapcmd(int, char **);
8490 static int umaskcmd(int, char **);
8491 static int unsetcmd(int, char **);
8492 static int ulimitcmd(int, char **);
8494 #define BUILTIN_NOSPEC "0"
8495 #define BUILTIN_SPECIAL "1"
8496 #define BUILTIN_REGULAR "2"
8497 #define BUILTIN_SPEC_REG "3"
8498 #define BUILTIN_ASSIGN "4"
8499 #define BUILTIN_SPEC_ASSG "5"
8500 #define BUILTIN_REG_ASSG "6"
8501 #define BUILTIN_SPEC_REG_ASSG "7"
8503 /* We do not handle [[ expr ]] bashism bash-compatibly,
8504 * we make it a synonym of [ expr ].
8505 * Basically, word splitting and pathname expansion should NOT be performed
8507 * no word splitting: a="a b"; [[ $a = "a b" ]]; echo $? should print "0"
8508 * no pathname expansion: [[ /bin/m* = "/bin/m*" ]]; echo $? should print "0"
8509 * Additional operators:
8510 * || and && should work as -o and -a
8512 * Apart from the above, [[ expr ]] should work as [ expr ]
8515 #define echocmd echo_main
8516 #define printfcmd printf_main
8517 #define testcmd test_main
8519 /* Keep these in proper order since it is searched via bsearch() */
8520 static const struct builtincmd builtintab[] = {
8521 { BUILTIN_SPEC_REG ".", dotcmd },
8522 { BUILTIN_SPEC_REG ":", truecmd },
8523 #if ENABLE_ASH_BUILTIN_TEST
8524 { BUILTIN_REGULAR "[", testcmd },
8525 #if ENABLE_ASH_BASH_COMPAT
8526 { BUILTIN_REGULAR "[[", testcmd },
8529 #if ENABLE_ASH_ALIAS
8530 { BUILTIN_REG_ASSG "alias", aliascmd },
8533 { BUILTIN_REGULAR "bg", fg_bgcmd },
8535 { BUILTIN_SPEC_REG "break", breakcmd },
8536 { BUILTIN_REGULAR "cd", cdcmd },
8537 { BUILTIN_NOSPEC "chdir", cdcmd },
8538 #if ENABLE_ASH_CMDCMD
8539 { BUILTIN_REGULAR "command", commandcmd },
8541 { BUILTIN_SPEC_REG "continue", breakcmd },
8542 #if ENABLE_ASH_BUILTIN_ECHO
8543 { BUILTIN_REGULAR "echo", echocmd },
8545 { BUILTIN_SPEC_REG "eval", evalcmd },
8546 { BUILTIN_SPEC_REG "exec", execcmd },
8547 { BUILTIN_SPEC_REG "exit", exitcmd },
8548 { BUILTIN_SPEC_REG_ASSG "export", exportcmd },
8549 { BUILTIN_REGULAR "false", falsecmd },
8551 { BUILTIN_REGULAR "fg", fg_bgcmd },
8553 #if ENABLE_ASH_GETOPTS
8554 { BUILTIN_REGULAR "getopts", getoptscmd },
8556 { BUILTIN_NOSPEC "hash", hashcmd },
8557 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
8558 { BUILTIN_NOSPEC "help", helpcmd },
8561 { BUILTIN_REGULAR "jobs", jobscmd },
8562 { BUILTIN_REGULAR "kill", killcmd },
8564 #if ENABLE_ASH_MATH_SUPPORT
8565 { BUILTIN_NOSPEC "let", letcmd },
8567 { BUILTIN_ASSIGN "local", localcmd },
8568 #if ENABLE_ASH_BUILTIN_PRINTF
8569 { BUILTIN_REGULAR "printf", printfcmd },
8571 { BUILTIN_NOSPEC "pwd", pwdcmd },
8572 { BUILTIN_REGULAR "read", readcmd },
8573 { BUILTIN_SPEC_REG_ASSG "readonly", exportcmd },
8574 { BUILTIN_SPEC_REG "return", returncmd },
8575 { BUILTIN_SPEC_REG "set", setcmd },
8576 { BUILTIN_SPEC_REG "shift", shiftcmd },
8577 { BUILTIN_SPEC_REG "source", dotcmd },
8578 #if ENABLE_ASH_BUILTIN_TEST
8579 { BUILTIN_REGULAR "test", testcmd },
8581 { BUILTIN_SPEC_REG "times", timescmd },
8582 { BUILTIN_SPEC_REG "trap", trapcmd },
8583 { BUILTIN_REGULAR "true", truecmd },
8584 { BUILTIN_NOSPEC "type", typecmd },
8585 { BUILTIN_NOSPEC "ulimit", ulimitcmd },
8586 { BUILTIN_REGULAR "umask", umaskcmd },
8587 #if ENABLE_ASH_ALIAS
8588 { BUILTIN_REGULAR "unalias", unaliascmd },
8590 { BUILTIN_SPEC_REG "unset", unsetcmd },
8591 { BUILTIN_REGULAR "wait", waitcmd },
8594 /* Should match the above table! */
8595 #define COMMANDCMD (builtintab + \
8597 1 * ENABLE_ASH_BUILTIN_TEST + \
8598 1 * ENABLE_ASH_BUILTIN_TEST * ENABLE_ASH_BASH_COMPAT + \
8599 1 * ENABLE_ASH_ALIAS + \
8600 1 * ENABLE_ASH_JOB_CONTROL + \
8602 #define EXECCMD (builtintab + \
8604 1 * ENABLE_ASH_BUILTIN_TEST + \
8605 1 * ENABLE_ASH_BUILTIN_TEST * ENABLE_ASH_BASH_COMPAT + \
8606 1 * ENABLE_ASH_ALIAS + \
8607 1 * ENABLE_ASH_JOB_CONTROL + \
8609 1 * ENABLE_ASH_CMDCMD + \
8611 ENABLE_ASH_BUILTIN_ECHO + \
8615 * Search the table of builtin commands.
8617 static struct builtincmd *
8618 find_builtin(const char *name)
8620 struct builtincmd *bp;
8623 name, builtintab, ARRAY_SIZE(builtintab), sizeof(builtintab[0]),
8630 * Execute a simple command.
8633 isassignment(const char *p)
8635 const char *q = endofname(p);
8641 bltincmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
8643 /* Preserve exitstatus of a previous possible redirection
8644 * as POSIX mandates */
8645 return back_exitstatus;
8648 evalcommand(union node *cmd, int flags)
8650 static const struct builtincmd null_bltin = {
8651 "\0\0", bltincmd /* why three NULs? */
8653 struct stackmark smark;
8655 struct arglist arglist;
8656 struct arglist varlist;
8659 const struct strlist *sp;
8660 struct cmdentry cmdentry;
8668 struct builtincmd *bcmd;
8669 int pseudovarflag = 0;
8671 /* First expand the arguments. */
8672 TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags));
8673 setstackmark(&smark);
8674 back_exitstatus = 0;
8676 cmdentry.cmdtype = CMDBUILTIN;
8677 cmdentry.u.cmd = &null_bltin;
8678 varlist.lastp = &varlist.list;
8679 *varlist.lastp = NULL;
8680 arglist.lastp = &arglist.list;
8681 *arglist.lastp = NULL;
8684 if (cmd->ncmd.args) {
8685 bcmd = find_builtin(cmd->ncmd.args->narg.text);
8686 pseudovarflag = bcmd && IS_BUILTIN_ASSIGN(bcmd);
8689 for (argp = cmd->ncmd.args; argp; argp = argp->narg.next) {
8690 struct strlist **spp;
8692 spp = arglist.lastp;
8693 if (pseudovarflag && isassignment(argp->narg.text))
8694 expandarg(argp, &arglist, EXP_VARTILDE);
8696 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
8698 for (sp = *spp; sp; sp = sp->next)
8702 argv = nargv = stalloc(sizeof(char *) * (argc + 1));
8703 for (sp = arglist.list; sp; sp = sp->next) {
8704 TRACE(("evalcommand arg: %s\n", sp->text));
8705 *nargv++ = sp->text;
8710 if (iflag && funcnest == 0 && argc > 0)
8711 lastarg = nargv[-1];
8714 expredir(cmd->ncmd.redirect);
8715 status = redirectsafe(cmd->ncmd.redirect, REDIR_PUSH | REDIR_SAVEFD2);
8718 for (argp = cmd->ncmd.assign; argp; argp = argp->narg.next) {
8719 struct strlist **spp;
8722 spp = varlist.lastp;
8723 expandarg(argp, &varlist, EXP_VARTILDE);
8726 * Modify the command lookup path, if a PATH= assignment
8730 if (varequal(p, path))
8734 /* Print the command if xflag is set. */
8737 const char *p = " %s";
8740 fdprintf(preverrout_fd, p, expandstr(ps4val()));
8743 for (n = 0; n < 2; n++) {
8745 fdprintf(preverrout_fd, p, sp->text);
8753 safe_write(preverrout_fd, "\n", 1);
8759 /* Now locate the command. */
8761 const char *oldpath;
8762 int cmd_flag = DO_ERR;
8767 find_command(argv[0], &cmdentry, cmd_flag, path);
8768 if (cmdentry.cmdtype == CMDUNKNOWN) {
8774 /* implement bltin and command here */
8775 if (cmdentry.cmdtype != CMDBUILTIN)
8778 spclbltin = IS_BUILTIN_SPECIAL(cmdentry.u.cmd);
8779 if (cmdentry.u.cmd == EXECCMD)
8781 #if ENABLE_ASH_CMDCMD
8782 if (cmdentry.u.cmd == COMMANDCMD) {
8784 nargv = parse_command_args(argv, &path);
8787 argc -= nargv - argv;
8789 cmd_flag |= DO_NOFUNC;
8797 /* We have a redirection error. */
8799 raise_exception(EXERROR);
8801 exitstatus = status;
8805 /* Execute the command. */
8806 switch (cmdentry.cmdtype) {
8808 #if ENABLE_FEATURE_SH_NOFORK
8810 /* find_command() encodes applet_no as (-2 - applet_no) */
8811 int applet_no = (- cmdentry.u.index - 2);
8812 if (applet_no >= 0 && APPLET_IS_NOFORK(applet_no)) {
8813 listsetvar(varlist.list, VEXPORT|VSTACK);
8814 /* run <applet>_main() */
8815 exitstatus = run_nofork_applet(applet_no, argv);
8821 /* Fork off a child process if necessary. */
8822 if (!(flags & EV_EXIT) || trap[0]) {
8824 jp = makejob(/*cmd,*/ 1);
8825 if (forkshell(jp, cmd, FORK_FG) != 0) {
8826 exitstatus = waitforjob(jp);
8832 listsetvar(varlist.list, VEXPORT|VSTACK);
8833 shellexec(argv, path, cmdentry.u.index);
8837 cmdenviron = varlist.list;
8839 struct strlist *list = cmdenviron;
8841 if (spclbltin > 0 || argc == 0) {
8843 if (cmd_is_exec && argc > 1)
8846 listsetvar(list, i);
8848 if (evalbltin(cmdentry.u.cmd, argc, argv)) {
8855 exit_status = 128 + SIGINT;
8857 exit_status = 128 + pendingsig;
8858 exitstatus = exit_status;
8859 if (i == EXINT || spclbltin > 0) {
8861 longjmp(exception_handler->loc, 1);
8868 listsetvar(varlist.list, 0);
8869 if (evalfun(cmdentry.u.func, argc, argv, flags))
8875 popredir(cmd_is_exec);
8877 /* dsl: I think this is intended to be used to support
8878 * '_' in 'vi' command mode during line editing...
8879 * However I implemented that within libedit itself.
8881 setvar("_", lastarg, 0);
8883 popstackmark(&smark);
8887 evalbltin(const struct builtincmd *cmd, int argc, char **argv)
8889 char *volatile savecmdname;
8890 struct jmploc *volatile savehandler;
8891 struct jmploc jmploc;
8894 savecmdname = commandname;
8895 i = setjmp(jmploc.loc);
8898 savehandler = exception_handler;
8899 exception_handler = &jmploc;
8900 commandname = argv[0];
8902 optptr = NULL; /* initialize nextopt */
8903 exitstatus = (*cmd->builtin)(argc, argv);
8904 flush_stdout_stderr();
8906 exitstatus |= ferror(stdout);
8908 commandname = savecmdname;
8910 exception_handler = savehandler;
8916 goodname(const char *p)
8918 return !*endofname(p);
8923 * Search for a command. This is called before we fork so that the
8924 * location of the command will be available in the parent as well as
8925 * the child. The check for "goodname" is an overly conservative
8926 * check that the name will not be subject to expansion.
8929 prehash(union node *n)
8931 struct cmdentry entry;
8933 if (n->type == NCMD && n->ncmd.args && goodname(n->ncmd.args->narg.text))
8934 find_command(n->ncmd.args->narg.text, &entry, 0, pathval());
8938 /* ============ Builtin commands
8940 * Builtin commands whose functions are closely tied to evaluation
8941 * are implemented here.
8945 * Handle break and continue commands. Break, continue, and return are
8946 * all handled by setting the evalskip flag. The evaluation routines
8947 * above all check this flag, and if it is set they start skipping
8948 * commands rather than executing them. The variable skipcount is
8949 * the number of loops to break/continue, or the number of function
8950 * levels to return. (The latter is always 1.) It should probably
8951 * be an error to break out of more loops than exist, but it isn't
8952 * in the standard shell so we don't make it one here.
8955 breakcmd(int argc UNUSED_PARAM, char **argv)
8957 int n = argv[1] ? number(argv[1]) : 1;
8960 ash_msg_and_raise_error(illnum, argv[1]);
8964 evalskip = (**argv == 'c') ? SKIPCONT : SKIPBREAK;
8971 /* ============ input.c
8973 * This implements the input routines used by the parser.
8976 #define EOF_NLEFT -99 /* value of parsenleft when EOF pushed back */
8979 INPUT_PUSH_FILE = 1,
8980 INPUT_NOFILE_OK = 2,
8983 static int plinno = 1; /* input line number */
8984 /* number of characters left in input buffer */
8985 static int parsenleft; /* copy of parsefile->nleft */
8986 static int parselleft; /* copy of parsefile->lleft */
8987 /* next character in input buffer */
8988 static char *parsenextc; /* copy of parsefile->nextc */
8990 static smallint checkkwd;
8991 /* values of checkkwd variable */
8992 #define CHKALIAS 0x1
8999 struct strpush *sp = g_parsefile->strpush;
9002 #if ENABLE_ASH_ALIAS
9004 if (parsenextc[-1] == ' ' || parsenextc[-1] == '\t') {
9005 checkkwd |= CHKALIAS;
9007 if (sp->string != sp->ap->val) {
9010 sp->ap->flag &= ~ALIASINUSE;
9011 if (sp->ap->flag & ALIASDEAD) {
9012 unalias(sp->ap->name);
9016 parsenextc = sp->prevstring;
9017 parsenleft = sp->prevnleft;
9018 /*dprintf("*** calling popstring: restoring to '%s'\n", parsenextc);*/
9019 g_parsefile->strpush = sp->prev;
9020 if (sp != &(g_parsefile->basestrpush))
9029 char *buf = g_parsefile->buf;
9032 #if ENABLE_FEATURE_EDITING
9034 if (!iflag || g_parsefile->fd)
9035 nr = nonblock_safe_read(g_parsefile->fd, buf, BUFSIZ - 1);
9037 #if ENABLE_FEATURE_TAB_COMPLETION
9038 line_input_state->path_lookup = pathval();
9040 nr = read_line_input(cmdedit_prompt, buf, BUFSIZ, line_input_state);
9042 /* Ctrl+C pressed */
9051 if (nr < 0 && errno == 0) {
9052 /* Ctrl+D pressed */
9057 nr = nonblock_safe_read(g_parsefile->fd, buf, BUFSIZ - 1);
9061 /* nonblock_safe_read() handles this problem */
9063 if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
9064 int flags = fcntl(0, F_GETFL);
9065 if (flags >= 0 && (flags & O_NONBLOCK)) {
9066 flags &= ~O_NONBLOCK;
9067 if (fcntl(0, F_SETFL, flags) >= 0) {
9068 out2str("sh: turning off NDELAY mode\n");
9079 * Refill the input buffer and return the next input character:
9081 * 1) If a string was pushed back on the input, pop it;
9082 * 2) If an EOF was pushed back (parsenleft == EOF_NLEFT) or we are reading
9083 * from a string so we can't refill the buffer, return EOF.
9084 * 3) If the is more stuff in this buffer, use it else call read to fill it.
9085 * 4) Process input up to the next newline, deleting nul characters.
9094 while (g_parsefile->strpush) {
9095 #if ENABLE_ASH_ALIAS
9096 if (parsenleft == -1 && g_parsefile->strpush->ap &&
9097 parsenextc[-1] != ' ' && parsenextc[-1] != '\t') {
9102 if (--parsenleft >= 0)
9103 return signed_char2int(*parsenextc++);
9105 if (parsenleft == EOF_NLEFT || g_parsefile->buf == NULL)
9107 flush_stdout_stderr();
9114 parselleft = parsenleft = EOF_NLEFT;
9121 /* delete nul characters */
9129 memmove(q, q + 1, more);
9133 parsenleft = q - parsenextc - 1;
9139 parsenleft = q - parsenextc - 1;
9151 out2str(parsenextc);
9156 return signed_char2int(*parsenextc++);
9159 #define pgetc_as_macro() (--parsenleft >= 0? signed_char2int(*parsenextc++) : preadbuffer())
9163 return pgetc_as_macro();
9166 #if ENABLE_ASH_OPTIMIZE_FOR_SIZE
9167 #define pgetc_macro() pgetc()
9169 #define pgetc_macro() pgetc_as_macro()
9173 * Same as pgetc(), but ignores PEOA.
9175 #if ENABLE_ASH_ALIAS
9183 } while (c == PEOA);
9190 return pgetc_macro();
9195 * Read a line from the script.
9198 pfgets(char *line, int len)
9204 while (--nleft > 0) {
9220 * Undo the last call to pgetc. Only one character may be pushed back.
9221 * PEOF may be pushed back.
9231 * Push a string back onto the input at this current parsefile level.
9232 * We handle aliases this way.
9234 #if !ENABLE_ASH_ALIAS
9235 #define pushstring(s, ap) pushstring(s)
9238 pushstring(char *s, struct alias *ap)
9245 /*dprintf("*** calling pushstring: %s, %d\n", s, len);*/
9246 if (g_parsefile->strpush) {
9247 sp = ckzalloc(sizeof(struct strpush));
9248 sp->prev = g_parsefile->strpush;
9249 g_parsefile->strpush = sp;
9251 sp = g_parsefile->strpush = &(g_parsefile->basestrpush);
9252 sp->prevstring = parsenextc;
9253 sp->prevnleft = parsenleft;
9254 #if ENABLE_ASH_ALIAS
9257 ap->flag |= ALIASINUSE;
9267 * To handle the "." command, a stack of input files is used. Pushfile
9268 * adds a new entry to the stack and popfile restores the previous level.
9273 struct parsefile *pf;
9275 g_parsefile->nleft = parsenleft;
9276 g_parsefile->lleft = parselleft;
9277 g_parsefile->nextc = parsenextc;
9278 g_parsefile->linno = plinno;
9279 pf = ckzalloc(sizeof(*pf));
9280 pf->prev = g_parsefile;
9282 /*pf->strpush = NULL; - ckzalloc did it */
9283 /*pf->basestrpush.prev = NULL;*/
9290 struct parsefile *pf = g_parsefile;
9298 g_parsefile = pf->prev;
9300 parsenleft = g_parsefile->nleft;
9301 parselleft = g_parsefile->lleft;
9302 parsenextc = g_parsefile->nextc;
9303 plinno = g_parsefile->linno;
9308 * Return to top level.
9313 while (g_parsefile != &basepf)
9318 * Close the file(s) that the shell is reading commands from. Called
9319 * after a fork is done.
9325 if (g_parsefile->fd > 0) {
9326 close(g_parsefile->fd);
9327 g_parsefile->fd = 0;
9332 * Like setinputfile, but takes an open file descriptor. Call this with
9336 setinputfd(int fd, int push)
9338 close_on_exec_on(fd);
9341 g_parsefile->buf = 0;
9343 g_parsefile->fd = fd;
9344 if (g_parsefile->buf == NULL)
9345 g_parsefile->buf = ckmalloc(IBUFSIZ);
9346 parselleft = parsenleft = 0;
9351 * Set the input to take input from a file. If push is set, push the
9352 * old input onto the stack first.
9355 setinputfile(const char *fname, int flags)
9361 fd = open(fname, O_RDONLY);
9363 if (flags & INPUT_NOFILE_OK)
9365 ash_msg_and_raise_error("can't open %s", fname);
9368 fd2 = copyfd(fd, 10);
9371 ash_msg_and_raise_error("out of file descriptors");
9374 setinputfd(fd, flags & INPUT_PUSH_FILE);
9381 * Like setinputfile, but takes input from a string.
9384 setinputstring(char *string)
9388 parsenextc = string;
9389 parsenleft = strlen(string);
9390 g_parsefile->buf = NULL;
9396 /* ============ mail.c
9398 * Routines to check for mail.
9403 #define MAXMBOXES 10
9405 /* times of mailboxes */
9406 static time_t mailtime[MAXMBOXES];
9407 /* Set if MAIL or MAILPATH is changed. */
9408 static smallint mail_var_path_changed;
9411 * Print appropriate message(s) if mail has arrived.
9412 * If mail_var_path_changed is set,
9413 * then the value of MAIL has mail_var_path_changed,
9414 * so we just update the values.
9423 struct stackmark smark;
9426 setstackmark(&smark);
9427 mpath = mpathset() ? mpathval() : mailval();
9428 for (mtp = mailtime; mtp < mailtime + MAXMBOXES; mtp++) {
9429 p = padvance(&mpath, nullstr);
9434 for (q = p; *q; q++)
9440 q[-1] = '\0'; /* delete trailing '/' */
9441 if (stat(p, &statb) < 0) {
9445 if (!mail_var_path_changed && statb.st_mtime != *mtp) {
9448 pathopt ? pathopt : "you have mail"
9451 *mtp = statb.st_mtime;
9453 mail_var_path_changed = 0;
9454 popstackmark(&smark);
9458 changemail(const char *val UNUSED_PARAM)
9460 mail_var_path_changed = 1;
9463 #endif /* ASH_MAIL */
9466 /* ============ ??? */
9469 * Set the shell parameters.
9472 setparam(char **argv)
9478 for (nparam = 0; argv[nparam]; nparam++)
9480 ap = newparam = ckmalloc((nparam + 1) * sizeof(*ap));
9482 *ap++ = ckstrdup(*argv++);
9485 freeparam(&shellparam);
9486 shellparam.malloced = 1;
9487 shellparam.nparam = nparam;
9488 shellparam.p = newparam;
9489 #if ENABLE_ASH_GETOPTS
9490 shellparam.optind = 1;
9491 shellparam.optoff = -1;
9496 * Process shell options. The global variable argptr contains a pointer
9497 * to the argument list; we advance it past the options.
9499 * SUSv3 section 2.8.1 "Consequences of Shell Errors" says:
9500 * For a non-interactive shell, an error condition encountered
9501 * by a special built-in ... shall cause the shell to write a diagnostic message
9502 * to standard error and exit as shown in the following table:
9503 * Error Special Built-In
9505 * Utility syntax error (option or operand error) Shall exit
9507 * However, in bug 1142 (http://busybox.net/bugs/view.php?id=1142)
9508 * we see that bash does not do that (set "finishes" with error code 1 instead,
9509 * and shell continues), and people rely on this behavior!
9511 * set -o barfoo 2>/dev/null
9514 * Oh well. Let's mimic that.
9517 plus_minus_o(char *name, int val)
9522 for (i = 0; i < NOPTS; i++) {
9523 if (strcmp(name, optnames(i)) == 0) {
9528 ash_msg("illegal option %co %s", val ? '-' : '+', name);
9531 for (i = 0; i < NOPTS; i++) {
9533 out1fmt("%-16s%s\n", optnames(i), optlist[i] ? "on" : "off");
9535 out1fmt("set %co %s\n", optlist[i] ? '-' : '+', optnames(i));
9541 setoption(int flag, int val)
9545 for (i = 0; i < NOPTS; i++) {
9546 if (optletters(i) == flag) {
9551 ash_msg_and_raise_error("illegal option %c%c", val ? '-' : '+', flag);
9555 options(int cmdline)
9563 while ((p = *argptr) != NULL) {
9565 if (c != '-' && c != '+')
9568 val = 0; /* val = 0 if c == '+' */
9571 if (p[0] == '\0' || LONE_DASH(p)) {
9573 /* "-" means turn off -x and -v */
9576 /* "--" means reset params */
9577 else if (*argptr == NULL)
9580 break; /* "-" or "--" terminates options */
9583 /* first char was + or - */
9584 while ((c = *p++) != '\0') {
9585 /* bash 3.2 indeed handles -c CMD and +c CMD the same */
9586 if (c == 'c' && cmdline) {
9587 minusc = p; /* command is after shell args */
9588 } else if (c == 'o') {
9589 if (plus_minus_o(*argptr, val)) {
9590 /* it already printed err message */
9591 return 1; /* error */
9595 } else if (cmdline && (c == 'l')) { /* -l or +l == --login */
9597 /* bash does not accept +-login, we also won't */
9598 } else if (cmdline && val && (c == '-')) { /* long options */
9599 if (strcmp(p, "login") == 0)
9611 * The shift builtin command.
9614 shiftcmd(int argc UNUSED_PARAM, char **argv)
9621 n = number(argv[1]);
9622 if (n > shellparam.nparam)
9623 n = shellparam.nparam;
9625 shellparam.nparam -= n;
9626 for (ap1 = shellparam.p; --n >= 0; ap1++) {
9627 if (shellparam.malloced)
9631 while ((*ap2++ = *ap1++) != NULL)
9633 #if ENABLE_ASH_GETOPTS
9634 shellparam.optind = 1;
9635 shellparam.optoff = -1;
9642 * POSIX requires that 'set' (but not export or readonly) output the
9643 * variables in lexicographic order - by the locale's collating order (sigh).
9644 * Maybe we could keep them in an ordered balanced binary tree
9645 * instead of hashed lists.
9646 * For now just roll 'em through qsort for printing...
9649 showvars(const char *sep_prefix, int on, int off)
9654 ep = listvars(on, off, &epend);
9655 qsort(ep, epend - ep, sizeof(char *), vpcmp);
9657 sep = *sep_prefix ? " " : sep_prefix;
9659 for (; ep < epend; ep++) {
9663 p = strchrnul(*ep, '=');
9666 q = single_quote(++p);
9667 out1fmt("%s%s%.*s%s\n", sep_prefix, sep, (int)(p - *ep), *ep, q);
9673 * The set command builtin.
9676 setcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
9681 return showvars(nullstr, 0, VUNSET);
9684 if (!options(0)) { /* if no parse error... */
9687 if (*argptr != NULL) {
9695 #if ENABLE_ASH_RANDOM_SUPPORT
9697 change_random(const char *value)
9699 /* Galois LFSR parameter */
9700 /* Taps at 32 31 29 1: */
9701 enum { MASK = 0x8000000b };
9702 /* Another example - taps at 32 31 30 10: */
9703 /* MASK = 0x00400007 */
9705 if (value == NULL) {
9706 /* "get", generate */
9709 /* LCG has period of 2^32 and alternating lowest bit */
9710 random_LCG = 1664525 * random_LCG + 1013904223;
9711 /* Galois LFSR has period of 2^32-1 = 3 * 5 * 17 * 257 * 65537 */
9712 t = (random_galois_LFSR << 1);
9713 if (random_galois_LFSR < 0) /* if we just shifted 1 out of msb... */
9715 random_galois_LFSR = t;
9716 /* Both are weak, combining them gives better randomness
9717 * and ~2^64 period. & 0x7fff is probably bash compat
9718 * for $RANDOM range. Combining with subtraction is
9719 * just for fun. + and ^ would work equally well. */
9720 t = (t - random_LCG) & 0x7fff;
9721 /* set without recursion */
9722 setvar(vrandom.text, utoa(t), VNOFUNC);
9723 vrandom.flags &= ~VNOFUNC;
9726 random_galois_LFSR = random_LCG = strtoul(value, (char **)NULL, 10);
9731 #if ENABLE_ASH_GETOPTS
9733 getopts(char *optstr, char *optvar, char **optfirst, int *param_optind, int *optoff)
9742 if (*param_optind < 1)
9744 optnext = optfirst + *param_optind - 1;
9746 if (*param_optind <= 1 || *optoff < 0 || (int)strlen(optnext[-1]) < *optoff)
9749 p = optnext[-1] + *optoff;
9750 if (p == NULL || *p == '\0') {
9751 /* Current word is done, advance */
9753 if (p == NULL || *p != '-' || *++p == '\0') {
9760 if (LONE_DASH(p)) /* check for "--" */
9765 for (q = optstr; *q != c;) {
9767 if (optstr[0] == ':') {
9770 err |= setvarsafe("OPTARG", s, 0);
9772 fprintf(stderr, "Illegal option -%c\n", c);
9783 if (*p == '\0' && (p = *optnext) == NULL) {
9784 if (optstr[0] == ':') {
9787 err |= setvarsafe("OPTARG", s, 0);
9790 fprintf(stderr, "No arg for -%c option\n", c);
9799 err |= setvarsafe("OPTARG", p, 0);
9802 err |= setvarsafe("OPTARG", nullstr, 0);
9804 *optoff = p ? p - *(optnext - 1) : -1;
9805 *param_optind = optnext - optfirst + 1;
9806 fmtstr(s, sizeof(s), "%d", *param_optind);
9807 err |= setvarsafe("OPTIND", s, VNOFUNC);
9810 err |= setvarsafe(optvar, s, 0);
9814 flush_stdout_stderr();
9815 raise_exception(EXERROR);
9821 * The getopts builtin. Shellparam.optnext points to the next argument
9822 * to be processed. Shellparam.optptr points to the next character to
9823 * be processed in the current argument. If shellparam.optnext is NULL,
9824 * then it's the first time getopts has been called.
9827 getoptscmd(int argc, char **argv)
9832 ash_msg_and_raise_error("usage: getopts optstring var [arg]");
9834 optbase = shellparam.p;
9835 if (shellparam.optind > shellparam.nparam + 1) {
9836 shellparam.optind = 1;
9837 shellparam.optoff = -1;
9841 if (shellparam.optind > argc - 2) {
9842 shellparam.optind = 1;
9843 shellparam.optoff = -1;
9847 return getopts(argv[1], argv[2], optbase, &shellparam.optind,
9848 &shellparam.optoff);
9850 #endif /* ASH_GETOPTS */
9853 /* ============ Shell parser */
9856 struct heredoc *next; /* next here document in list */
9857 union node *here; /* redirection node */
9858 char *eofmark; /* string indicating end of input */
9859 smallint striptabs; /* if set, strip leading tabs */
9862 static smallint tokpushback; /* last token pushed back */
9863 static smallint parsebackquote; /* nonzero if we are inside backquotes */
9864 static smallint quoteflag; /* set if (part of) last token was quoted */
9865 static token_id_t lasttoken; /* last token read (integer id Txxx) */
9866 static struct heredoc *heredoclist; /* list of here documents to read */
9867 static char *wordtext; /* text of last word returned by readtoken */
9868 static struct nodelist *backquotelist;
9869 static union node *redirnode;
9870 static struct heredoc *heredoc;
9872 * NEOF is returned by parsecmd when it encounters an end of file. It
9873 * must be distinct from NULL, so we use the address of a variable that
9874 * happens to be handy.
9876 #define NEOF ((union node *)&tokpushback)
9878 static void raise_error_syntax(const char *) NORETURN;
9880 raise_error_syntax(const char *msg)
9882 ash_msg_and_raise_error("syntax error: %s", msg);
9887 * Called when an unexpected token is read during the parse. The argument
9888 * is the token that is expected, or -1 if more than one type of token can
9889 * occur at this point.
9891 static void raise_error_unexpected_syntax(int) NORETURN;
9893 raise_error_unexpected_syntax(int token)
9898 l = sprintf(msg, "%s unexpected", tokname(lasttoken));
9900 sprintf(msg + l, " (expecting %s)", tokname(token));
9901 raise_error_syntax(msg);
9905 #define EOFMARKLEN 79
9907 /* parsing is heavily cross-recursive, need these forward decls */
9908 static union node *andor(void);
9909 static union node *pipeline(void);
9910 static union node *parse_command(void);
9911 static void parseheredoc(void);
9912 static char peektoken(void);
9913 static int readtoken(void);
9918 union node *n1, *n2, *n3;
9921 checkkwd = CHKNL | CHKKWD | CHKALIAS;
9922 if (nlflag == 2 && peektoken())
9928 if (tok == TBACKGND) {
9929 if (n2->type == NPIPE) {
9930 n2->npipe.pipe_backgnd = 1;
9932 if (n2->type != NREDIR) {
9933 n3 = stzalloc(sizeof(struct nredir));
9935 /*n3->nredir.redirect = NULL; - stzalloc did it */
9938 n2->type = NBACKGND;
9944 n3 = stzalloc(sizeof(struct nbinary));
9946 n3->nbinary.ch1 = n1;
9947 n3->nbinary.ch2 = n2;
9963 checkkwd = CHKNL | CHKKWD | CHKALIAS;
9971 pungetc(); /* push back EOF on input */
9975 raise_error_unexpected_syntax(-1);
9985 union node *n1, *n2, *n3;
9993 } else if (t == TOR) {
9999 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10001 n3 = stzalloc(sizeof(struct nbinary));
10003 n3->nbinary.ch1 = n1;
10004 n3->nbinary.ch2 = n2;
10009 static union node *
10012 union node *n1, *n2, *pipenode;
10013 struct nodelist *lp, *prev;
10017 TRACE(("pipeline: entered\n"));
10018 if (readtoken() == TNOT) {
10020 checkkwd = CHKKWD | CHKALIAS;
10023 n1 = parse_command();
10024 if (readtoken() == TPIPE) {
10025 pipenode = stzalloc(sizeof(struct npipe));
10026 pipenode->type = NPIPE;
10027 /*pipenode->npipe.pipe_backgnd = 0; - stzalloc did it */
10028 lp = stzalloc(sizeof(struct nodelist));
10029 pipenode->npipe.cmdlist = lp;
10033 lp = stzalloc(sizeof(struct nodelist));
10034 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10035 lp->n = parse_command();
10037 } while (readtoken() == TPIPE);
10043 n2 = stzalloc(sizeof(struct nnot));
10051 static union node *
10056 n = stzalloc(sizeof(struct narg));
10058 /*n->narg.next = NULL; - stzalloc did it */
10059 n->narg.text = wordtext;
10060 n->narg.backquote = backquotelist;
10065 fixredir(union node *n, const char *text, int err)
10069 TRACE(("Fix redir %s %d\n", text, err));
10071 n->ndup.vname = NULL;
10073 fd = bb_strtou(text, NULL, 10);
10074 if (!errno && fd >= 0)
10075 n->ndup.dupfd = fd;
10076 else if (LONE_DASH(text))
10077 n->ndup.dupfd = -1;
10080 raise_error_syntax("Bad fd number");
10081 n->ndup.vname = makename();
10086 * Returns true if the text contains nothing to expand (no dollar signs
10090 noexpand(char *text)
10096 while ((c = *p++) != '\0') {
10097 if (c == CTLQUOTEMARK)
10101 else if (SIT(c, BASESYNTAX) == CCTL)
10110 union node *n = redirnode;
10112 if (readtoken() != TWORD)
10113 raise_error_unexpected_syntax(-1);
10114 if (n->type == NHERE) {
10115 struct heredoc *here = heredoc;
10119 if (quoteflag == 0)
10121 TRACE(("Here document %d\n", n->type));
10122 if (!noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN)
10123 raise_error_syntax("Illegal eof marker for << redirection");
10124 rmescapes(wordtext);
10125 here->eofmark = wordtext;
10127 if (heredoclist == NULL)
10128 heredoclist = here;
10130 for (p = heredoclist; p->next; p = p->next)
10134 } else if (n->type == NTOFD || n->type == NFROMFD) {
10135 fixredir(n, wordtext, 0);
10137 n->nfile.fname = makename();
10141 static union node *
10144 union node *args, **app;
10145 union node *n = NULL;
10146 union node *vars, **vpp;
10147 union node **rpp, *redir;
10149 #if ENABLE_ASH_BASH_COMPAT
10150 smallint double_brackets_flag = 0;
10160 savecheckkwd = CHKALIAS;
10163 checkkwd = savecheckkwd;
10166 #if ENABLE_ASH_BASH_COMPAT
10167 case TAND: /* "&&" */
10168 case TOR: /* "||" */
10169 if (!double_brackets_flag) {
10173 wordtext = (char *) (t == TAND ? "-a" : "-o");
10176 n = stzalloc(sizeof(struct narg));
10178 /*n->narg.next = NULL; - stzalloc did it */
10179 n->narg.text = wordtext;
10180 #if ENABLE_ASH_BASH_COMPAT
10181 if (strcmp("[[", wordtext) == 0)
10182 double_brackets_flag = 1;
10183 else if (strcmp("]]", wordtext) == 0)
10184 double_brackets_flag = 0;
10186 n->narg.backquote = backquotelist;
10187 if (savecheckkwd && isassignment(wordtext)) {
10189 vpp = &n->narg.next;
10192 app = &n->narg.next;
10197 *rpp = n = redirnode;
10198 rpp = &n->nfile.next;
10199 parsefname(); /* read name of redirection file */
10202 if (args && app == &args->narg.next
10205 struct builtincmd *bcmd;
10208 /* We have a function */
10209 if (readtoken() != TRP)
10210 raise_error_unexpected_syntax(TRP);
10211 name = n->narg.text;
10212 if (!goodname(name)
10213 || ((bcmd = find_builtin(name)) && IS_BUILTIN_SPECIAL(bcmd))
10215 raise_error_syntax("Bad function name");
10218 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10219 n->narg.next = parse_command();
10232 n = stzalloc(sizeof(struct ncmd));
10234 n->ncmd.args = args;
10235 n->ncmd.assign = vars;
10236 n->ncmd.redirect = redir;
10240 static union node *
10241 parse_command(void)
10243 union node *n1, *n2;
10244 union node *ap, **app;
10245 union node *cp, **cpp;
10246 union node *redir, **rpp;
10253 switch (readtoken()) {
10255 raise_error_unexpected_syntax(-1);
10258 n1 = stzalloc(sizeof(struct nif));
10260 n1->nif.test = list(0);
10261 if (readtoken() != TTHEN)
10262 raise_error_unexpected_syntax(TTHEN);
10263 n1->nif.ifpart = list(0);
10265 while (readtoken() == TELIF) {
10266 n2->nif.elsepart = stzalloc(sizeof(struct nif));
10267 n2 = n2->nif.elsepart;
10269 n2->nif.test = list(0);
10270 if (readtoken() != TTHEN)
10271 raise_error_unexpected_syntax(TTHEN);
10272 n2->nif.ifpart = list(0);
10274 if (lasttoken == TELSE)
10275 n2->nif.elsepart = list(0);
10277 n2->nif.elsepart = NULL;
10285 n1 = stzalloc(sizeof(struct nbinary));
10286 n1->type = (lasttoken == TWHILE) ? NWHILE : NUNTIL;
10287 n1->nbinary.ch1 = list(0);
10290 TRACE(("expecting DO got %s %s\n", tokname(got),
10291 got == TWORD ? wordtext : ""));
10292 raise_error_unexpected_syntax(TDO);
10294 n1->nbinary.ch2 = list(0);
10299 if (readtoken() != TWORD || quoteflag || !goodname(wordtext))
10300 raise_error_syntax("Bad for loop variable");
10301 n1 = stzalloc(sizeof(struct nfor));
10303 n1->nfor.var = wordtext;
10304 checkkwd = CHKKWD | CHKALIAS;
10305 if (readtoken() == TIN) {
10307 while (readtoken() == TWORD) {
10308 n2 = stzalloc(sizeof(struct narg));
10310 /*n2->narg.next = NULL; - stzalloc did it */
10311 n2->narg.text = wordtext;
10312 n2->narg.backquote = backquotelist;
10314 app = &n2->narg.next;
10317 n1->nfor.args = ap;
10318 if (lasttoken != TNL && lasttoken != TSEMI)
10319 raise_error_unexpected_syntax(-1);
10321 n2 = stzalloc(sizeof(struct narg));
10323 /*n2->narg.next = NULL; - stzalloc did it */
10324 n2->narg.text = (char *)dolatstr;
10325 /*n2->narg.backquote = NULL;*/
10326 n1->nfor.args = n2;
10328 * Newline or semicolon here is optional (but note
10329 * that the original Bourne shell only allowed NL).
10331 if (lasttoken != TNL && lasttoken != TSEMI)
10334 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10335 if (readtoken() != TDO)
10336 raise_error_unexpected_syntax(TDO);
10337 n1->nfor.body = list(0);
10341 n1 = stzalloc(sizeof(struct ncase));
10343 if (readtoken() != TWORD)
10344 raise_error_unexpected_syntax(TWORD);
10345 n1->ncase.expr = n2 = stzalloc(sizeof(struct narg));
10347 /*n2->narg.next = NULL; - stzalloc did it */
10348 n2->narg.text = wordtext;
10349 n2->narg.backquote = backquotelist;
10351 checkkwd = CHKKWD | CHKALIAS;
10352 } while (readtoken() == TNL);
10353 if (lasttoken != TIN)
10354 raise_error_unexpected_syntax(TIN);
10355 cpp = &n1->ncase.cases;
10357 checkkwd = CHKNL | CHKKWD;
10359 while (t != TESAC) {
10360 if (lasttoken == TLP)
10362 *cpp = cp = stzalloc(sizeof(struct nclist));
10364 app = &cp->nclist.pattern;
10366 *app = ap = stzalloc(sizeof(struct narg));
10368 /*ap->narg.next = NULL; - stzalloc did it */
10369 ap->narg.text = wordtext;
10370 ap->narg.backquote = backquotelist;
10371 if (readtoken() != TPIPE)
10373 app = &ap->narg.next;
10376 //ap->narg.next = NULL;
10377 if (lasttoken != TRP)
10378 raise_error_unexpected_syntax(TRP);
10379 cp->nclist.body = list(2);
10381 cpp = &cp->nclist.next;
10383 checkkwd = CHKNL | CHKKWD;
10387 raise_error_unexpected_syntax(TENDCASE);
10394 n1 = stzalloc(sizeof(struct nredir));
10395 n1->type = NSUBSHELL;
10396 n1->nredir.n = list(0);
10397 /*n1->nredir.redirect = NULL; - stzalloc did it */
10407 return simplecmd();
10410 if (readtoken() != t)
10411 raise_error_unexpected_syntax(t);
10414 /* Now check for redirection which may follow command */
10415 checkkwd = CHKKWD | CHKALIAS;
10417 while (readtoken() == TREDIR) {
10418 *rpp = n2 = redirnode;
10419 rpp = &n2->nfile.next;
10425 if (n1->type != NSUBSHELL) {
10426 n2 = stzalloc(sizeof(struct nredir));
10431 n1->nredir.redirect = redir;
10436 #if ENABLE_ASH_BASH_COMPAT
10437 static int decode_dollar_squote(void)
10439 static const char C_escapes[] ALIGN1 = "nrbtfav""x\\01234567";
10445 p = strchr(C_escapes, c);
10450 if ((unsigned char)(c - '0') <= 7) { /* \ooo */
10454 } while ((unsigned char)(c - '0') <= 7 && --cnt);
10456 } else if (c == 'x') { /* \xHH */
10460 } while (isxdigit(c) && --cnt);
10462 if (cnt == 3) { /* \x but next char is "bad" */
10466 } else { /* simple seq like \\ or \t */
10471 c = bb_process_escape_sequence((void*)&p);
10472 } else { /* unrecognized "\z": print both chars unless ' or " */
10473 if (c != '\'' && c != '"') {
10475 c |= 0x100; /* "please encode \, then me" */
10483 * If eofmark is NULL, read a word or a redirection symbol. If eofmark
10484 * is not NULL, read a here document. In the latter case, eofmark is the
10485 * word which marks the end of the document and striptabs is true if
10486 * leading tabs should be stripped from the document. The argument firstc
10487 * is the first character of the input token or document.
10489 * Because C does not have internal subroutines, I have simulated them
10490 * using goto's to implement the subroutine linkage. The following macros
10491 * will run code that appears at the end of readtoken1.
10493 #define CHECKEND() {goto checkend; checkend_return:;}
10494 #define PARSEREDIR() {goto parseredir; parseredir_return:;}
10495 #define PARSESUB() {goto parsesub; parsesub_return:;}
10496 #define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;}
10497 #define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;}
10498 #define PARSEARITH() {goto parsearith; parsearith_return:;}
10500 readtoken1(int firstc, int syntax, char *eofmark, int striptabs)
10502 /* NB: syntax parameter fits into smallint */
10506 char line[EOFMARKLEN + 1];
10507 struct nodelist *bqlist;
10511 smallint prevsyntax; /* syntax before arithmetic */
10512 #if ENABLE_ASH_EXPAND_PRMT
10513 smallint pssyntax; /* we are expanding a prompt string */
10515 int varnest; /* levels of variables expansion */
10516 int arinest; /* levels of arithmetic expansion */
10517 int parenlevel; /* levels of parens in arithmetic */
10518 int dqvarnest; /* levels of variables expansion within double quotes */
10520 USE_ASH_BASH_COMPAT(smallint bash_dollar_squote = 0;)
10523 /* Avoid longjmp clobbering */
10529 (void) &parenlevel;
10532 (void) &prevsyntax;
10535 startlinno = plinno;
10540 #if ENABLE_ASH_EXPAND_PRMT
10541 pssyntax = (syntax == PSSYNTAX);
10545 dblquote = (syntax == DQSYNTAX);
10551 STARTSTACKSTR(out);
10552 loop: { /* for each line, until end of word */
10553 CHECKEND(); /* set c to PEOF if at end of here document */
10554 for (;;) { /* until end of line or end of word */
10555 CHECKSTRSPACE(4, out); /* permit 4 calls to USTPUTC */
10556 switch (SIT(c, syntax)) {
10557 case CNL: /* '\n' */
10558 if (syntax == BASESYNTAX)
10559 goto endword; /* exit outer loop */
10565 goto loop; /* continue outer loop */
10570 if (eofmark == NULL || dblquote)
10571 USTPUTC(CTLESC, out);
10572 #if ENABLE_ASH_BASH_COMPAT
10573 if (c == '\\' && bash_dollar_squote) {
10574 c = decode_dollar_squote();
10576 USTPUTC('\\', out);
10577 c = (unsigned char)c;
10583 case CBACK: /* backslash */
10586 USTPUTC(CTLESC, out);
10587 USTPUTC('\\', out);
10589 } else if (c == '\n') {
10593 #if ENABLE_ASH_EXPAND_PRMT
10594 if (c == '$' && pssyntax) {
10595 USTPUTC(CTLESC, out);
10596 USTPUTC('\\', out);
10599 if (dblquote && c != '\\'
10600 && c != '`' && c != '$'
10601 && (c != '"' || eofmark != NULL)
10603 USTPUTC(CTLESC, out);
10604 USTPUTC('\\', out);
10606 if (SIT(c, SQSYNTAX) == CCTL)
10607 USTPUTC(CTLESC, out);
10615 if (eofmark == NULL) {
10616 USTPUTC(CTLQUOTEMARK, out);
10624 USE_ASH_BASH_COMPAT(bash_dollar_squote = 0;)
10625 if (eofmark != NULL && arinest == 0
10630 if (dqvarnest == 0) {
10631 syntax = BASESYNTAX;
10638 case CVAR: /* '$' */
10639 PARSESUB(); /* parse substitution */
10641 case CENDVAR: /* '}' */
10644 if (dqvarnest > 0) {
10647 USTPUTC(CTLENDVAR, out);
10652 #if ENABLE_ASH_MATH_SUPPORT
10653 case CLP: /* '(' in arithmetic */
10657 case CRP: /* ')' in arithmetic */
10658 if (parenlevel > 0) {
10662 if (pgetc() == ')') {
10663 if (--arinest == 0) {
10664 USTPUTC(CTLENDARI, out);
10665 syntax = prevsyntax;
10666 dblquote = (syntax == DQSYNTAX);
10671 * unbalanced parens
10672 * (don't 2nd guess - no error)
10680 case CBQUOTE: /* '`' */
10684 goto endword; /* exit outer loop */
10689 goto endword; /* exit outer loop */
10690 #if ENABLE_ASH_ALIAS
10700 #if ENABLE_ASH_MATH_SUPPORT
10701 if (syntax == ARISYNTAX)
10702 raise_error_syntax("Missing '))'");
10704 if (syntax != BASESYNTAX && !parsebackquote && eofmark == NULL)
10705 raise_error_syntax("Unterminated quoted string");
10706 if (varnest != 0) {
10707 startlinno = plinno;
10709 raise_error_syntax("Missing '}'");
10711 USTPUTC('\0', out);
10712 len = out - (char *)stackblock();
10713 out = stackblock();
10714 if (eofmark == NULL) {
10715 if ((c == '>' || c == '<') && quotef == 0) {
10716 int maxlen = 9 + 1; /* max 9 digit fd#: 999999999 */
10718 while (--maxlen && isdigit(*np))
10721 PARSEREDIR(); /* passed as params: out, c */
10722 lasttoken = TREDIR;
10725 /* else: non-number X seen, interpret it
10726 * as "NNNX>file" = "NNNX >file" */
10730 quoteflag = quotef;
10731 backquotelist = bqlist;
10732 grabstackblock(len);
10736 /* end of readtoken routine */
10739 * Check to see whether we are at the end of the here document. When this
10740 * is called, c is set to the first character of the next input line. If
10741 * we are at the end of the here document, this routine sets the c to PEOF.
10745 #if ENABLE_ASH_ALIAS
10751 while (c == '\t') {
10755 if (c == *eofmark) {
10756 if (pfgets(line, sizeof(line)) != NULL) {
10760 for (q = eofmark + 1; *q && *p == *q; p++, q++)
10762 if (*p == '\n' && *q == '\0') {
10765 needprompt = doprompt;
10767 pushstring(line, NULL);
10772 goto checkend_return;
10776 * Parse a redirection operator. The variable "out" points to a string
10777 * specifying the fd to be redirected. The variable "c" contains the
10778 * first character of the redirection operator.
10781 /* out is already checked to be a valid number or "" */
10782 int fd = (*out == '\0' ? -1 : atoi(out));
10785 np = stzalloc(sizeof(struct nfile));
10790 np->type = NAPPEND;
10792 np->type = NCLOBBER;
10799 } else { /* c == '<' */
10800 /*np->nfile.fd = 0; - stzalloc did it */
10804 if (sizeof(struct nfile) != sizeof(struct nhere)) {
10805 np = stzalloc(sizeof(struct nhere));
10806 /*np->nfile.fd = 0; - stzalloc did it */
10809 heredoc = stzalloc(sizeof(struct heredoc));
10810 heredoc->here = np;
10813 heredoc->striptabs = 1;
10815 /*heredoc->striptabs = 0; - stzalloc did it */
10821 np->type = NFROMFD;
10825 np->type = NFROMTO;
10837 goto parseredir_return;
10841 * Parse a substitution. At this point, we have read the dollar sign
10842 * and nothing else.
10845 /* is_special(c) evaluates to 1 for c in "!#$*-0123456789?@"; 0 otherwise
10846 * (assuming ascii char codes, as the original implementation did) */
10847 #define is_special(c) \
10848 (((unsigned)(c) - 33 < 32) \
10849 && ((0xc1ff920dU >> ((unsigned)(c) - 33)) & 1))
10855 static const char types[] ALIGN1 = "}-+?=";
10858 if (c <= PEOA_OR_PEOF
10859 || (c != '(' && c != '{' && !is_name(c) && !is_special(c))
10861 #if ENABLE_ASH_BASH_COMPAT
10863 bash_dollar_squote = 1;
10868 } else if (c == '(') { /* $(command) or $((arith)) */
10869 if (pgetc() == '(') {
10870 #if ENABLE_ASH_MATH_SUPPORT
10873 raise_error_syntax("you disabled math support for $((arith)) syntax");
10880 USTPUTC(CTLVAR, out);
10881 typeloc = out - (char *)stackblock();
10882 USTPUTC(VSNORMAL, out);
10883 subtype = VSNORMAL;
10891 subtype = VSLENGTH;
10895 if (c > PEOA_OR_PEOF && is_name(c)) {
10899 } while (c > PEOA_OR_PEOF && is_in_name(c));
10900 } else if (isdigit(c)) {
10904 } while (isdigit(c));
10905 } else if (is_special(c)) {
10909 badsub: raise_error_syntax("Bad substitution");
10913 if (subtype == 0) {
10917 #if ENABLE_ASH_BASH_COMPAT
10918 if (c == ':' || c == '$' || isdigit(c)) {
10920 subtype = VSSUBSTR;
10927 p = strchr(types, c);
10930 subtype = p - types + VSNORMAL;
10935 subtype = c == '#' ? VSTRIMLEFT : VSTRIMRIGHT;
10943 #if ENABLE_ASH_BASH_COMPAT
10945 subtype = VSREPLACE;
10948 subtype++; /* VSREPLACEALL */
10957 if (dblquote || arinest)
10959 *((char *)stackblock() + typeloc) = subtype | flags;
10960 if (subtype != VSNORMAL) {
10962 if (dblquote || arinest) {
10967 goto parsesub_return;
10971 * Called to parse command substitutions. Newstyle is set if the command
10972 * is enclosed inside $(...); nlpp is a pointer to the head of the linked
10973 * list of commands (passed by reference), and savelen is the number of
10974 * characters on the top of the stack which must be preserved.
10977 struct nodelist **nlpp;
10980 char *volatile str;
10981 struct jmploc jmploc;
10982 struct jmploc *volatile savehandler;
10984 smallint saveprompt = 0;
10987 (void) &saveprompt;
10989 savepbq = parsebackquote;
10990 if (setjmp(jmploc.loc)) {
10992 parsebackquote = 0;
10993 exception_handler = savehandler;
10994 longjmp(exception_handler->loc, 1);
10998 savelen = out - (char *)stackblock();
11000 str = ckmalloc(savelen);
11001 memcpy(str, stackblock(), savelen);
11003 savehandler = exception_handler;
11004 exception_handler = &jmploc;
11007 /* We must read until the closing backquote, giving special
11008 treatment to some slashes, and then push the string and
11009 reread it as input, interpreting it normally. */
11016 STARTSTACKSTR(pout);
11033 * If eating a newline, avoid putting
11034 * the newline into the new character
11035 * stream (via the STPUTC after the
11040 if (pc != '\\' && pc != '`' && pc != '$'
11041 && (!dblquote || pc != '"'))
11042 STPUTC('\\', pout);
11043 if (pc > PEOA_OR_PEOF) {
11049 #if ENABLE_ASH_ALIAS
11052 startlinno = plinno;
11053 raise_error_syntax("EOF in backquote substitution");
11057 needprompt = doprompt;
11066 STPUTC('\0', pout);
11067 psavelen = pout - (char *)stackblock();
11068 if (psavelen > 0) {
11069 pstr = grabstackstr(pout);
11070 setinputstring(pstr);
11075 nlpp = &(*nlpp)->next;
11076 *nlpp = stzalloc(sizeof(**nlpp));
11077 /* (*nlpp)->next = NULL; - stzalloc did it */
11078 parsebackquote = oldstyle;
11081 saveprompt = doprompt;
11088 doprompt = saveprompt;
11089 else if (readtoken() != TRP)
11090 raise_error_unexpected_syntax(TRP);
11095 * Start reading from old file again, ignoring any pushed back
11096 * tokens left from the backquote parsing
11101 while (stackblocksize() <= savelen)
11103 STARTSTACKSTR(out);
11105 memcpy(out, str, savelen);
11106 STADJUST(savelen, out);
11112 parsebackquote = savepbq;
11113 exception_handler = savehandler;
11114 if (arinest || dblquote)
11115 USTPUTC(CTLBACKQ | CTLQUOTE, out);
11117 USTPUTC(CTLBACKQ, out);
11119 goto parsebackq_oldreturn;
11120 goto parsebackq_newreturn;
11123 #if ENABLE_ASH_MATH_SUPPORT
11125 * Parse an arithmetic expansion (indicate start of one and set state)
11128 if (++arinest == 1) {
11129 prevsyntax = syntax;
11130 syntax = ARISYNTAX;
11131 USTPUTC(CTLARI, out);
11138 * we collapse embedded arithmetic expansion to
11139 * parenthesis, which should be equivalent
11143 goto parsearith_return;
11147 } /* end of readtoken */
11150 * Read the next input token.
11151 * If the token is a word, we set backquotelist to the list of cmds in
11152 * backquotes. We set quoteflag to true if any part of the word was
11154 * If the token is TREDIR, then we set redirnode to a structure containing
11156 * In all cases, the variable startlinno is set to the number of the line
11157 * on which the token starts.
11159 * [Change comment: here documents and internal procedures]
11160 * [Readtoken shouldn't have any arguments. Perhaps we should make the
11161 * word parsing code into a separate routine. In this case, readtoken
11162 * doesn't need to have any internal procedures, but parseword does.
11163 * We could also make parseoperator in essence the main routine, and
11164 * have parseword (readtoken1?) handle both words and redirection.]
11166 #define NEW_xxreadtoken
11167 #ifdef NEW_xxreadtoken
11168 /* singles must be first! */
11169 static const char xxreadtoken_chars[7] ALIGN1 = {
11170 '\n', '(', ')', '&', '|', ';', 0
11173 static const char xxreadtoken_tokens[] ALIGN1 = {
11174 TNL, TLP, TRP, /* only single occurrence allowed */
11175 TBACKGND, TPIPE, TSEMI, /* if single occurrence */
11176 TEOF, /* corresponds to trailing nul */
11177 TAND, TOR, TENDCASE /* if double occurrence */
11180 #define xxreadtoken_doubles \
11181 (sizeof(xxreadtoken_tokens) - sizeof(xxreadtoken_chars))
11182 #define xxreadtoken_singles \
11183 (sizeof(xxreadtoken_chars) - xxreadtoken_doubles - 1)
11197 startlinno = plinno;
11198 for (;;) { /* until token or start of word found */
11201 if ((c != ' ') && (c != '\t')
11202 #if ENABLE_ASH_ALIAS
11207 while ((c = pgetc()) != '\n' && c != PEOF)
11210 } else if (c == '\\') {
11211 if (pgetc() != '\n') {
11215 startlinno = ++plinno;
11220 = xxreadtoken_chars + sizeof(xxreadtoken_chars) - 1;
11225 needprompt = doprompt;
11228 p = strchr(xxreadtoken_chars, c);
11231 return readtoken1(c, BASESYNTAX, (char *) NULL, 0);
11234 if ((size_t)(p - xxreadtoken_chars) >= xxreadtoken_singles) {
11235 if (pgetc() == *p) { /* double occurrence? */
11236 p += xxreadtoken_doubles + 1;
11242 lasttoken = xxreadtoken_tokens[p - xxreadtoken_chars];
11249 #define RETURN(token) return lasttoken = token
11262 startlinno = plinno;
11263 for (;;) { /* until token or start of word found */
11266 case ' ': case '\t':
11267 #if ENABLE_ASH_ALIAS
11272 while ((c = pgetc()) != '\n' && c != PEOF)
11277 if (pgetc() == '\n') {
11278 startlinno = ++plinno;
11287 needprompt = doprompt;
11292 if (pgetc() == '&')
11297 if (pgetc() == '|')
11302 if (pgetc() == ';')
11315 return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
11318 #endif /* NEW_xxreadtoken */
11325 smallint alreadyseen = tokpushback;
11328 #if ENABLE_ASH_ALIAS
11337 if (checkkwd & CHKNL) {
11344 if (t != TWORD || quoteflag) {
11349 * check for keywords
11351 if (checkkwd & CHKKWD) {
11352 const char *const *pp;
11354 pp = findkwd(wordtext);
11356 lasttoken = t = pp - tokname_array;
11357 TRACE(("keyword %s recognized\n", tokname(t)));
11362 if (checkkwd & CHKALIAS) {
11363 #if ENABLE_ASH_ALIAS
11365 ap = lookupalias(wordtext, 1);
11368 pushstring(ap->val, ap);
11378 TRACE(("token %s %s\n", tokname(t), t == TWORD ? wordtext : ""));
11380 TRACE(("reread token %s %s\n", tokname(t), t == TWORD ? wordtext : ""));
11392 return tokname_array[t][0];
11396 * Read and parse a command. Returns NEOF on end of file. (NULL is a
11397 * valid parse tree indicating a blank line.)
11399 static union node *
11400 parsecmd(int interact)
11405 doprompt = interact;
11407 setprompt(doprompt);
11419 * Input any here documents.
11424 struct heredoc *here;
11427 here = heredoclist;
11428 heredoclist = NULL;
11434 readtoken1(pgetc(), here->here->type == NHERE? SQSYNTAX : DQSYNTAX,
11435 here->eofmark, here->striptabs);
11436 n = stzalloc(sizeof(struct narg));
11437 n->narg.type = NARG;
11438 /*n->narg.next = NULL; - stzalloc did it */
11439 n->narg.text = wordtext;
11440 n->narg.backquote = backquotelist;
11441 here->here->nhere.doc = n;
11448 * called by editline -- any expansions to the prompt should be added here.
11450 #if ENABLE_ASH_EXPAND_PRMT
11451 static const char *
11452 expandstr(const char *ps)
11456 /* XXX Fix (char *) cast. */
11457 setinputstring((char *)ps);
11458 readtoken1(pgetc(), PSSYNTAX, nullstr, 0);
11461 n.narg.type = NARG;
11462 n.narg.next = NULL;
11463 n.narg.text = wordtext;
11464 n.narg.backquote = backquotelist;
11466 expandarg(&n, NULL, 0);
11467 return stackblock();
11472 * Execute a command or commands contained in a string.
11475 evalstring(char *s, int mask)
11478 struct stackmark smark;
11482 setstackmark(&smark);
11485 while ((n = parsecmd(0)) != NEOF) {
11487 popstackmark(&smark);
11500 * The eval command.
11503 evalcmd(int argc UNUSED_PARAM, char **argv)
11512 STARTSTACKSTR(concat);
11514 concat = stack_putstr(p, concat);
11518 STPUTC(' ', concat);
11520 STPUTC('\0', concat);
11521 p = grabstackstr(concat);
11523 evalstring(p, ~SKIPEVAL);
11530 * Read and execute commands. "Top" is nonzero for the top level command
11531 * loop; it turns on prompting if the shell is interactive.
11537 struct stackmark smark;
11541 TRACE(("cmdloop(%d) called\n", top));
11545 setstackmark(&smark);
11548 showjobs(stderr, SHOW_CHANGED);
11551 if (iflag && top) {
11553 #if ENABLE_ASH_MAIL
11557 n = parsecmd(inter);
11558 /* showtree(n); DEBUG */
11560 if (!top || numeof >= 50)
11562 if (!stoppedjobs()) {
11565 out2str("\nUse \"exit\" to leave shell.\n");
11568 } else if (nflag == 0) {
11569 /* job_warning can only be 2,1,0. Here 2->1, 1/0->0 */
11574 popstackmark(&smark);
11579 return skip & SKIPEVAL;
11586 * Take commands from a file. To be compatible we should do a path
11587 * search for the file, which is necessary to find sub-commands.
11590 find_dot_file(char *name)
11593 const char *path = pathval();
11596 /* don't try this for absolute or relative paths */
11597 if (strchr(name, '/'))
11600 while ((fullname = padvance(&path, name)) != NULL) {
11601 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
11603 * Don't bother freeing here, since it will
11604 * be freed by the caller.
11608 stunalloc(fullname);
11611 /* not found in the PATH */
11612 ash_msg_and_raise_error("%s: not found", name);
11617 dotcmd(int argc, char **argv)
11619 struct strlist *sp;
11620 volatile struct shparam saveparam;
11623 for (sp = cmdenviron; sp; sp = sp->next)
11624 setvareq(ckstrdup(sp->text), VSTRFIXED | VTEXTFIXED);
11626 if (argv[1]) { /* That's what SVR2 does */
11627 char *fullname = find_dot_file(argv[1]);
11630 if (argc) { /* argc > 0, argv[0] != NULL */
11631 saveparam = shellparam;
11632 shellparam.malloced = 0;
11633 shellparam.nparam = argc;
11634 shellparam.p = argv;
11637 setinputfile(fullname, INPUT_PUSH_FILE);
11638 commandname = fullname;
11643 freeparam(&shellparam);
11644 shellparam = saveparam;
11646 status = exitstatus;
11652 exitcmd(int argc UNUSED_PARAM, char **argv)
11657 exitstatus = number(argv[1]);
11658 raise_exception(EXEXIT);
11663 * Read a file containing shell functions.
11666 readcmdfile(char *name)
11668 setinputfile(name, INPUT_PUSH_FILE);
11674 /* ============ find_command inplementation */
11677 * Resolve a command name. If you change this routine, you may have to
11678 * change the shellexec routine as well.
11681 find_command(char *name, struct cmdentry *entry, int act, const char *path)
11683 struct tblentry *cmdp;
11690 struct builtincmd *bcmd;
11692 /* If name contains a slash, don't use PATH or hash table */
11693 if (strchr(name, '/') != NULL) {
11694 entry->u.index = -1;
11695 if (act & DO_ABS) {
11696 while (stat(name, &statb) < 0) {
11698 if (errno == EINTR)
11701 entry->cmdtype = CMDUNKNOWN;
11705 entry->cmdtype = CMDNORMAL;
11709 /* #if ENABLE_FEATURE_SH_STANDALONE... moved after builtin check */
11711 updatetbl = (path == pathval());
11714 if (strstr(path, "%builtin") != NULL)
11715 act |= DO_ALTBLTIN;
11718 /* If name is in the table, check answer will be ok */
11719 cmdp = cmdlookup(name, 0);
11720 if (cmdp != NULL) {
11723 switch (cmdp->cmdtype) {
11741 } else if (cmdp->rehash == 0)
11742 /* if not invalidated by cd, we're done */
11746 /* If %builtin not in path, check for builtin next */
11747 bcmd = find_builtin(name);
11749 if (IS_BUILTIN_REGULAR(bcmd))
11750 goto builtin_success;
11751 if (act & DO_ALTPATH) {
11752 if (!(act & DO_ALTBLTIN))
11753 goto builtin_success;
11754 } else if (builtinloc <= 0) {
11755 goto builtin_success;
11759 #if ENABLE_FEATURE_SH_STANDALONE
11761 int applet_no = find_applet_by_name(name);
11762 if (applet_no >= 0) {
11763 entry->cmdtype = CMDNORMAL;
11764 entry->u.index = -2 - applet_no;
11770 /* We have to search path. */
11771 prev = -1; /* where to start */
11772 if (cmdp && cmdp->rehash) { /* doing a rehash */
11773 if (cmdp->cmdtype == CMDBUILTIN)
11776 prev = cmdp->param.index;
11782 while ((fullname = padvance(&path, name)) != NULL) {
11783 stunalloc(fullname);
11784 /* NB: code below will still use fullname
11785 * despite it being "unallocated" */
11788 if (prefix(pathopt, "builtin")) {
11790 goto builtin_success;
11793 if ((act & DO_NOFUNC)
11794 || !prefix(pathopt, "func")
11795 ) { /* ignore unimplemented options */
11799 /* if rehash, don't redo absolute path names */
11800 if (fullname[0] == '/' && idx <= prev) {
11803 TRACE(("searchexec \"%s\": no change\n", name));
11806 while (stat(fullname, &statb) < 0) {
11808 if (errno == EINTR)
11811 if (errno != ENOENT && errno != ENOTDIR)
11815 e = EACCES; /* if we fail, this will be the error */
11816 if (!S_ISREG(statb.st_mode))
11818 if (pathopt) { /* this is a %func directory */
11819 stalloc(strlen(fullname) + 1);
11820 /* NB: stalloc will return space pointed by fullname
11821 * (because we don't have any intervening allocations
11822 * between stunalloc above and this stalloc) */
11823 readcmdfile(fullname);
11824 cmdp = cmdlookup(name, 0);
11825 if (cmdp == NULL || cmdp->cmdtype != CMDFUNCTION)
11826 ash_msg_and_raise_error("%s not defined in %s", name, fullname);
11827 stunalloc(fullname);
11830 TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
11832 entry->cmdtype = CMDNORMAL;
11833 entry->u.index = idx;
11837 cmdp = cmdlookup(name, 1);
11838 cmdp->cmdtype = CMDNORMAL;
11839 cmdp->param.index = idx;
11844 /* We failed. If there was an entry for this command, delete it */
11845 if (cmdp && updatetbl)
11846 delete_cmd_entry();
11848 ash_msg("%s: %s", name, errmsg(e, "not found"));
11849 entry->cmdtype = CMDUNKNOWN;
11854 entry->cmdtype = CMDBUILTIN;
11855 entry->u.cmd = bcmd;
11859 cmdp = cmdlookup(name, 1);
11860 cmdp->cmdtype = CMDBUILTIN;
11861 cmdp->param.cmd = bcmd;
11865 entry->cmdtype = cmdp->cmdtype;
11866 entry->u = cmdp->param;
11870 /* ============ trap.c */
11873 * The trap builtin.
11876 trapcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
11885 for (signo = 0; signo < NSIG; signo++) {
11886 if (trap[signo] != NULL) {
11889 sn = get_signame(signo);
11890 out1fmt("trap -- %s %s\n",
11891 single_quote(trap[signo]), sn);
11901 signo = get_signum(*ap);
11903 ash_msg_and_raise_error("%s: bad trap", *ap);
11906 if (LONE_DASH(action))
11909 action = ckstrdup(action);
11912 trap[signo] = action;
11922 /* ============ Builtins */
11924 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
11926 * Lists available builtins
11929 helpcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
11934 out1fmt("\nBuilt-in commands:\n-------------------\n");
11935 for (col = 0, i = 0; i < ARRAY_SIZE(builtintab); i++) {
11936 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '),
11937 builtintab[i].name + 1);
11943 #if ENABLE_FEATURE_SH_STANDALONE
11945 const char *a = applet_names;
11947 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '), a);
11952 a += strlen(a) + 1;
11957 return EXIT_SUCCESS;
11959 #endif /* FEATURE_SH_EXTRA_QUIET */
11962 * The export and readonly commands.
11965 exportcmd(int argc UNUSED_PARAM, char **argv)
11971 int flag = argv[0][0] == 'r'? VREADONLY : VEXPORT;
11973 if (nextopt("p") != 'p') {
11978 p = strchr(name, '=');
11982 vp = *findvar(hashvar(name), name);
11988 setvar(name, p, flag);
11989 } while ((name = *++aptr) != NULL);
11993 showvars(argv[0], flag, 0);
11998 * Delete a function if it exists.
12001 unsetfunc(const char *name)
12003 struct tblentry *cmdp;
12005 cmdp = cmdlookup(name, 0);
12006 if (cmdp!= NULL && cmdp->cmdtype == CMDFUNCTION)
12007 delete_cmd_entry();
12011 * The unset builtin command. We unset the function before we unset the
12012 * variable to allow a function to be unset when there is a readonly variable
12013 * with the same name.
12016 unsetcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12023 while ((i = nextopt("vf")) != '\0') {
12027 for (ap = argptr; *ap; ap++) {
12043 #include <sys/times.h>
12045 static const unsigned char timescmd_str[] ALIGN1 = {
12046 ' ', offsetof(struct tms, tms_utime),
12047 '\n', offsetof(struct tms, tms_stime),
12048 ' ', offsetof(struct tms, tms_cutime),
12049 '\n', offsetof(struct tms, tms_cstime),
12054 timescmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12056 long clk_tck, s, t;
12057 const unsigned char *p;
12060 clk_tck = sysconf(_SC_CLK_TCK);
12065 t = *(clock_t *)(((char *) &buf) + p[1]);
12067 out1fmt("%ldm%ld.%.3lds%c",
12069 ((t - s * clk_tck) * 1000) / clk_tck,
12071 } while (*(p += 2));
12076 #if ENABLE_ASH_MATH_SUPPORT
12078 dash_arith(const char *s)
12084 result = arith(s, &errcode);
12087 ash_msg_and_raise_error("exponent less than 0");
12089 ash_msg_and_raise_error("divide by zero");
12091 ash_msg_and_raise_error("expression recursion loop detected");
12092 raise_error_syntax(s);
12100 * The let builtin. partial stolen from GNU Bash, the Bourne Again SHell.
12101 * Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
12103 * Copyright (C) 2003 Vladimir Oleynik <dzo@simtreas.ru>
12106 letcmd(int argc UNUSED_PARAM, char **argv)
12112 ash_msg_and_raise_error("expression expected");
12114 i = dash_arith(*argv);
12119 #endif /* ASH_MATH_SUPPORT */
12122 /* ============ miscbltin.c
12124 * Miscellaneous builtins.
12129 #if defined(__GLIBC__) && __GLIBC__ == 2 && __GLIBC_MINOR__ < 1
12130 typedef enum __rlimit_resource rlim_t;
12134 * The read builtin. Options:
12135 * -r Do not interpret '\' specially
12136 * -s Turn off echo (tty only)
12137 * -n NCHARS Read NCHARS max
12138 * -p PROMPT Display PROMPT on stderr (if input is from tty)
12139 * -t SECONDS Timeout after SECONDS (tty or pipe only)
12140 * -u FD Read from given FD instead of fd 0
12141 * This uses unbuffered input, which may be avoidable in some cases.
12142 * TODO: bash also has:
12143 * -a ARRAY Read into array[0],[1],etc
12144 * -d DELIM End on DELIM char, not newline
12145 * -e Use line editing (tty only)
12148 readcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12150 static const char *const arg_REPLY[] = { "REPLY", NULL };
12163 #if ENABLE_ASH_READ_NCHARS
12164 int nchars = 0; /* if != 0, -n is in effect */
12166 struct termios tty, old_tty;
12168 #if ENABLE_ASH_READ_TIMEOUT
12169 unsigned end_ms = 0;
12170 unsigned timeout = 0;
12175 while ((i = nextopt("p:u:r"
12176 USE_ASH_READ_TIMEOUT("t:")
12177 USE_ASH_READ_NCHARS("n:s")
12181 prompt = optionarg;
12183 #if ENABLE_ASH_READ_NCHARS
12185 nchars = bb_strtou(optionarg, NULL, 10);
12186 if (nchars < 0 || errno)
12187 ash_msg_and_raise_error("invalid count");
12188 /* nchars == 0: off (bash 3.2 does this too) */
12194 #if ENABLE_ASH_READ_TIMEOUT
12196 timeout = bb_strtou(optionarg, NULL, 10);
12197 if (errno || timeout > UINT_MAX / 2048)
12198 ash_msg_and_raise_error("invalid timeout");
12200 #if 0 /* even bash have no -t N.NNN support */
12201 ts.tv_sec = bb_strtou(optionarg, &p, 10);
12203 /* EINVAL means number is ok, but not terminated by NUL */
12204 if (*p == '.' && errno == EINVAL) {
12208 ts.tv_usec = bb_strtou(p, &p2, 10);
12210 ash_msg_and_raise_error("invalid timeout");
12212 /* normalize to usec */
12214 ash_msg_and_raise_error("invalid timeout");
12215 while (scale++ < 6)
12218 } else if (ts.tv_sec < 0 || errno) {
12219 ash_msg_and_raise_error("invalid timeout");
12221 if (!(ts.tv_sec | ts.tv_usec)) { /* both are 0? */
12222 ash_msg_and_raise_error("invalid timeout");
12231 fd = bb_strtou(optionarg, NULL, 10);
12232 if (fd < 0 || errno)
12233 ash_msg_and_raise_error("invalid file descriptor");
12239 if (prompt && isatty(fd)) {
12244 ap = (char**)arg_REPLY;
12245 ifs = bltinlookup("IFS");
12248 #if ENABLE_ASH_READ_NCHARS
12249 tcgetattr(fd, &tty);
12251 if (nchars || silent) {
12253 tty.c_lflag &= ~ICANON;
12254 tty.c_cc[VMIN] = nchars < 256 ? nchars : 255;
12257 tty.c_lflag &= ~(ECHO | ECHOK | ECHONL);
12259 /* if tcgetattr failed, tcsetattr will fail too.
12260 * Ignoring, it's harmless. */
12261 tcsetattr(fd, TCSANOW, &tty);
12268 #if ENABLE_ASH_READ_TIMEOUT
12269 if (timeout) /* NB: ensuring end_ms is nonzero */
12270 end_ms = ((unsigned)(monotonic_us() / 1000) + timeout) | 1;
12274 #if ENABLE_ASH_READ_TIMEOUT
12276 struct pollfd pfd[1];
12278 pfd[0].events = POLLIN;
12279 timeout = end_ms - (unsigned)(monotonic_us() / 1000);
12280 if ((int)timeout <= 0 /* already late? */
12281 || safe_poll(pfd, 1, timeout) != 1 /* no? wait... */
12282 ) { /* timed out! */
12283 #if ENABLE_ASH_READ_NCHARS
12284 tcsetattr(fd, TCSANOW, &old_tty);
12290 if (nonblock_safe_read(fd, &c, 1) != 1) {
12302 if (!rflag && c == '\\') {
12308 if (startword && *ifs == ' ' && strchr(ifs, c)) {
12312 if (ap[1] != NULL && strchr(ifs, c) != NULL) {
12314 setvar(*ap, stackblock(), 0);
12323 /* end of do {} while: */
12324 #if ENABLE_ASH_READ_NCHARS
12330 #if ENABLE_ASH_READ_NCHARS
12331 tcsetattr(fd, TCSANOW, &old_tty);
12335 /* Remove trailing blanks */
12336 while ((char *)stackblock() <= --p && strchr(ifs, *p) != NULL)
12338 setvar(*ap, stackblock(), 0);
12339 while (*++ap != NULL)
12340 setvar(*ap, nullstr, 0);
12345 umaskcmd(int argc UNUSED_PARAM, char **argv)
12347 static const char permuser[3] ALIGN1 = "ugo";
12348 static const char permmode[3] ALIGN1 = "rwx";
12349 static const short permmask[] ALIGN2 = {
12350 S_IRUSR, S_IWUSR, S_IXUSR,
12351 S_IRGRP, S_IWGRP, S_IXGRP,
12352 S_IROTH, S_IWOTH, S_IXOTH
12358 int symbolic_mode = 0;
12360 while (nextopt("S") != '\0') {
12371 if (symbolic_mode) {
12375 for (i = 0; i < 3; i++) {
12378 *p++ = permuser[i];
12380 for (j = 0; j < 3; j++) {
12381 if ((mask & permmask[3 * i + j]) == 0) {
12382 *p++ = permmode[j];
12390 out1fmt("%.4o\n", mask);
12393 if (isdigit((unsigned char) *ap)) {
12396 if (*ap >= '8' || *ap < '0')
12397 ash_msg_and_raise_error(illnum, argv[1]);
12398 mask = (mask << 3) + (*ap - '0');
12399 } while (*++ap != '\0');
12402 mask = ~mask & 0777;
12403 if (!bb_parse_mode(ap, &mask)) {
12404 ash_msg_and_raise_error("illegal mode: %s", ap);
12406 umask(~mask & 0777);
12415 * This code, originally by Doug Gwyn, Doug Kingston, Eric Gisin, and
12416 * Michael Rendell was ripped from pdksh 5.0.8 and hacked for use with
12417 * ash by J.T. Conklin.
12423 uint8_t cmd; /* RLIMIT_xxx fit into it */
12424 uint8_t factor_shift; /* shift by to get rlim_{cur,max} values */
12428 static const struct limits limits_tbl[] = {
12430 { RLIMIT_CPU, 0, 't' },
12432 #ifdef RLIMIT_FSIZE
12433 { RLIMIT_FSIZE, 9, 'f' },
12436 { RLIMIT_DATA, 10, 'd' },
12438 #ifdef RLIMIT_STACK
12439 { RLIMIT_STACK, 10, 's' },
12442 { RLIMIT_CORE, 9, 'c' },
12445 { RLIMIT_RSS, 10, 'm' },
12447 #ifdef RLIMIT_MEMLOCK
12448 { RLIMIT_MEMLOCK, 10, 'l' },
12450 #ifdef RLIMIT_NPROC
12451 { RLIMIT_NPROC, 0, 'p' },
12453 #ifdef RLIMIT_NOFILE
12454 { RLIMIT_NOFILE, 0, 'n' },
12457 { RLIMIT_AS, 10, 'v' },
12459 #ifdef RLIMIT_LOCKS
12460 { RLIMIT_LOCKS, 0, 'w' },
12463 static const char limits_name[] =
12465 "time(seconds)" "\0"
12467 #ifdef RLIMIT_FSIZE
12468 "file(blocks)" "\0"
12473 #ifdef RLIMIT_STACK
12477 "coredump(blocks)" "\0"
12482 #ifdef RLIMIT_MEMLOCK
12483 "locked memory(kb)" "\0"
12485 #ifdef RLIMIT_NPROC
12488 #ifdef RLIMIT_NOFILE
12494 #ifdef RLIMIT_LOCKS
12499 enum limtype { SOFT = 0x1, HARD = 0x2 };
12502 printlim(enum limtype how, const struct rlimit *limit,
12503 const struct limits *l)
12507 val = limit->rlim_max;
12509 val = limit->rlim_cur;
12511 if (val == RLIM_INFINITY)
12512 out1fmt("unlimited\n");
12514 val >>= l->factor_shift;
12515 out1fmt("%lld\n", (long long) val);
12520 ulimitcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12524 enum limtype how = SOFT | HARD;
12525 const struct limits *l;
12528 struct rlimit limit;
12531 while ((optc = nextopt("HSa"
12535 #ifdef RLIMIT_FSIZE
12541 #ifdef RLIMIT_STACK
12550 #ifdef RLIMIT_MEMLOCK
12553 #ifdef RLIMIT_NPROC
12556 #ifdef RLIMIT_NOFILE
12562 #ifdef RLIMIT_LOCKS
12580 for (l = limits_tbl; l->option != what; l++)
12583 set = *argptr ? 1 : 0;
12587 if (all || argptr[1])
12588 ash_msg_and_raise_error("too many arguments");
12589 if (strncmp(p, "unlimited\n", 9) == 0)
12590 val = RLIM_INFINITY;
12594 while ((c = *p++) >= '0' && c <= '9') {
12595 val = (val * 10) + (long)(c - '0');
12596 // val is actually 'unsigned long int' and can't get < 0
12597 if (val < (rlim_t) 0)
12601 ash_msg_and_raise_error("bad number");
12602 val <<= l->factor_shift;
12606 const char *lname = limits_name;
12607 for (l = limits_tbl; l != &limits_tbl[ARRAY_SIZE(limits_tbl)]; l++) {
12608 getrlimit(l->cmd, &limit);
12609 out1fmt("%-20s ", lname);
12610 lname += strlen(lname) + 1;
12611 printlim(how, &limit, l);
12616 getrlimit(l->cmd, &limit);
12619 limit.rlim_max = val;
12621 limit.rlim_cur = val;
12622 if (setrlimit(l->cmd, &limit) < 0)
12623 ash_msg_and_raise_error("error setting limit (%m)");
12625 printlim(how, &limit, l);
12631 /* ============ Math support */
12633 #if ENABLE_ASH_MATH_SUPPORT
12635 /* Copyright (c) 2001 Aaron Lehmann <aaronl@vitelus.com>
12637 Permission is hereby granted, free of charge, to any person obtaining
12638 a copy of this software and associated documentation files (the
12639 "Software"), to deal in the Software without restriction, including
12640 without limitation the rights to use, copy, modify, merge, publish,
12641 distribute, sublicense, and/or sell copies of the Software, and to
12642 permit persons to whom the Software is furnished to do so, subject to
12643 the following conditions:
12645 The above copyright notice and this permission notice shall be
12646 included in all copies or substantial portions of the Software.
12648 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
12649 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
12650 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
12651 IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
12652 CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
12653 TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
12654 SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
12657 /* This is my infix parser/evaluator. It is optimized for size, intended
12658 * as a replacement for yacc-based parsers. However, it may well be faster
12659 * than a comparable parser written in yacc. The supported operators are
12660 * listed in #defines below. Parens, order of operations, and error handling
12661 * are supported. This code is thread safe. The exact expression format should
12662 * be that which POSIX specifies for shells. */
12664 /* The code uses a simple two-stack algorithm. See
12665 * http://www.onthenet.com.au/~grahamis/int2008/week02/lect02.html
12666 * for a detailed explanation of the infix-to-postfix algorithm on which
12667 * this is based (this code differs in that it applies operators immediately
12668 * to the stack instead of adding them to a queue to end up with an
12671 /* To use the routine, call it with an expression string and error return
12675 * Aug 24, 2001 Manuel Novoa III
12677 * Reduced the generated code size by about 30% (i386) and fixed several bugs.
12679 * 1) In arith_apply():
12680 * a) Cached values of *numptr and &(numptr[-1]).
12681 * b) Removed redundant test for zero denominator.
12684 * a) Eliminated redundant code for processing operator tokens by moving
12685 * to a table-based implementation. Also folded handling of parens
12687 * b) Combined all 3 loops which called arith_apply to reduce generated
12688 * code size at the cost of speed.
12690 * 3) The following expressions were treated as valid by the original code:
12691 * 1() , 0! , 1 ( *3 ) .
12692 * These bugs have been fixed by internally enclosing the expression in
12693 * parens and then checking that all binary ops and right parens are
12694 * preceded by a valid expression (NUM_TOKEN).
12696 * Note: It may be desirable to replace Aaron's test for whitespace with
12697 * ctype's isspace() if it is used by another busybox applet or if additional
12698 * whitespace chars should be considered. Look below the "#include"s for a
12699 * precompiler test.
12703 * Aug 26, 2001 Manuel Novoa III
12705 * Return 0 for null expressions. Pointed out by Vladimir Oleynik.
12707 * Merge in Aaron's comments previously posted to the busybox list,
12708 * modified slightly to take account of my changes to the code.
12713 * (C) 2003 Vladimir Oleynik <dzo@simtreas.ru>
12715 * - allow access to variable,
12716 * used recursive find value indirection (c=2*2; a="c"; $((a+=2)) produce 6)
12717 * - realize assign syntax (VAR=expr, +=, *= etc)
12718 * - realize exponentiation (** operator)
12719 * - realize comma separated - expr, expr
12720 * - realise ++expr --expr expr++ expr--
12721 * - realise expr ? expr : expr (but, second expr calculate always)
12722 * - allow hexadecimal and octal numbers
12723 * - was restored loses XOR operator
12724 * - remove one goto label, added three ;-)
12725 * - protect $((num num)) as true zero expr (Manuel`s error)
12726 * - always use special isspace(), see comment from bash ;-)
12729 #define arith_isspace(arithval) \
12730 (arithval == ' ' || arithval == '\n' || arithval == '\t')
12732 typedef unsigned char operator;
12734 /* An operator's token id is a bit of a bitfield. The lower 5 bits are the
12735 * precedence, and 3 high bits are an ID unique across operators of that
12736 * precedence. The ID portion is so that multiple operators can have the
12737 * same precedence, ensuring that the leftmost one is evaluated first.
12738 * Consider * and /. */
12740 #define tok_decl(prec,id) (((id)<<5)|(prec))
12741 #define PREC(op) ((op) & 0x1F)
12743 #define TOK_LPAREN tok_decl(0,0)
12745 #define TOK_COMMA tok_decl(1,0)
12747 #define TOK_ASSIGN tok_decl(2,0)
12748 #define TOK_AND_ASSIGN tok_decl(2,1)
12749 #define TOK_OR_ASSIGN tok_decl(2,2)
12750 #define TOK_XOR_ASSIGN tok_decl(2,3)
12751 #define TOK_PLUS_ASSIGN tok_decl(2,4)
12752 #define TOK_MINUS_ASSIGN tok_decl(2,5)
12753 #define TOK_LSHIFT_ASSIGN tok_decl(2,6)
12754 #define TOK_RSHIFT_ASSIGN tok_decl(2,7)
12756 #define TOK_MUL_ASSIGN tok_decl(3,0)
12757 #define TOK_DIV_ASSIGN tok_decl(3,1)
12758 #define TOK_REM_ASSIGN tok_decl(3,2)
12760 /* all assign is right associativity and precedence eq, but (7+3)<<5 > 256 */
12761 #define convert_prec_is_assing(prec) do { if (prec == 3) prec = 2; } while (0)
12763 /* conditional is right associativity too */
12764 #define TOK_CONDITIONAL tok_decl(4,0)
12765 #define TOK_CONDITIONAL_SEP tok_decl(4,1)
12767 #define TOK_OR tok_decl(5,0)
12769 #define TOK_AND tok_decl(6,0)
12771 #define TOK_BOR tok_decl(7,0)
12773 #define TOK_BXOR tok_decl(8,0)
12775 #define TOK_BAND tok_decl(9,0)
12777 #define TOK_EQ tok_decl(10,0)
12778 #define TOK_NE tok_decl(10,1)
12780 #define TOK_LT tok_decl(11,0)
12781 #define TOK_GT tok_decl(11,1)
12782 #define TOK_GE tok_decl(11,2)
12783 #define TOK_LE tok_decl(11,3)
12785 #define TOK_LSHIFT tok_decl(12,0)
12786 #define TOK_RSHIFT tok_decl(12,1)
12788 #define TOK_ADD tok_decl(13,0)
12789 #define TOK_SUB tok_decl(13,1)
12791 #define TOK_MUL tok_decl(14,0)
12792 #define TOK_DIV tok_decl(14,1)
12793 #define TOK_REM tok_decl(14,2)
12795 /* exponent is right associativity */
12796 #define TOK_EXPONENT tok_decl(15,1)
12798 /* For now unary operators. */
12799 #define UNARYPREC 16
12800 #define TOK_BNOT tok_decl(UNARYPREC,0)
12801 #define TOK_NOT tok_decl(UNARYPREC,1)
12803 #define TOK_UMINUS tok_decl(UNARYPREC+1,0)
12804 #define TOK_UPLUS tok_decl(UNARYPREC+1,1)
12806 #define PREC_PRE (UNARYPREC+2)
12808 #define TOK_PRE_INC tok_decl(PREC_PRE, 0)
12809 #define TOK_PRE_DEC tok_decl(PREC_PRE, 1)
12811 #define PREC_POST (UNARYPREC+3)
12813 #define TOK_POST_INC tok_decl(PREC_POST, 0)
12814 #define TOK_POST_DEC tok_decl(PREC_POST, 1)
12816 #define SPEC_PREC (UNARYPREC+4)
12818 #define TOK_NUM tok_decl(SPEC_PREC, 0)
12819 #define TOK_RPAREN tok_decl(SPEC_PREC, 1)
12821 #define NUMPTR (*numstackptr)
12824 tok_have_assign(operator op)
12826 operator prec = PREC(op);
12828 convert_prec_is_assing(prec);
12829 return (prec == PREC(TOK_ASSIGN) ||
12830 prec == PREC_PRE || prec == PREC_POST);
12834 is_right_associativity(operator prec)
12836 return (prec == PREC(TOK_ASSIGN) || prec == PREC(TOK_EXPONENT)
12837 || prec == PREC(TOK_CONDITIONAL));
12842 arith_t contidional_second_val;
12843 char contidional_second_val_initialized;
12844 char *var; /* if NULL then is regular number,
12845 else is variable name */
12848 typedef struct chk_var_recursive_looped_t {
12850 struct chk_var_recursive_looped_t *next;
12851 } chk_var_recursive_looped_t;
12853 static chk_var_recursive_looped_t *prev_chk_var_recursive;
12856 arith_lookup_val(v_n_t *t)
12859 const char * p = lookupvar(t->var);
12864 /* recursive try as expression */
12865 chk_var_recursive_looped_t *cur;
12866 chk_var_recursive_looped_t cur_save;
12868 for (cur = prev_chk_var_recursive; cur; cur = cur->next) {
12869 if (strcmp(cur->var, t->var) == 0) {
12870 /* expression recursion loop detected */
12874 /* save current lookuped var name */
12875 cur = prev_chk_var_recursive;
12876 cur_save.var = t->var;
12877 cur_save.next = cur;
12878 prev_chk_var_recursive = &cur_save;
12880 t->val = arith (p, &errcode);
12881 /* restore previous ptr after recursiving */
12882 prev_chk_var_recursive = cur;
12885 /* allow undefined var as 0 */
12891 /* "applying" a token means performing it on the top elements on the integer
12892 * stack. For a unary operator it will only change the top element, but a
12893 * binary operator will pop two arguments and push a result */
12895 arith_apply(operator op, v_n_t *numstack, v_n_t **numstackptr)
12898 arith_t numptr_val, rez;
12899 int ret_arith_lookup_val;
12901 /* There is no operator that can work without arguments */
12902 if (NUMPTR == numstack) goto err;
12903 numptr_m1 = NUMPTR - 1;
12905 /* check operand is var with noninteger value */
12906 ret_arith_lookup_val = arith_lookup_val(numptr_m1);
12907 if (ret_arith_lookup_val)
12908 return ret_arith_lookup_val;
12910 rez = numptr_m1->val;
12911 if (op == TOK_UMINUS)
12913 else if (op == TOK_NOT)
12915 else if (op == TOK_BNOT)
12917 else if (op == TOK_POST_INC || op == TOK_PRE_INC)
12919 else if (op == TOK_POST_DEC || op == TOK_PRE_DEC)
12921 else if (op != TOK_UPLUS) {
12922 /* Binary operators */
12924 /* check and binary operators need two arguments */
12925 if (numptr_m1 == numstack) goto err;
12927 /* ... and they pop one */
12930 if (op == TOK_CONDITIONAL) {
12931 if (!numptr_m1->contidional_second_val_initialized) {
12932 /* protect $((expr1 ? expr2)) without ": expr" */
12935 rez = numptr_m1->contidional_second_val;
12936 } else if (numptr_m1->contidional_second_val_initialized) {
12937 /* protect $((expr1 : expr2)) without "expr ? " */
12940 numptr_m1 = NUMPTR - 1;
12941 if (op != TOK_ASSIGN) {
12942 /* check operand is var with noninteger value for not '=' */
12943 ret_arith_lookup_val = arith_lookup_val(numptr_m1);
12944 if (ret_arith_lookup_val)
12945 return ret_arith_lookup_val;
12947 if (op == TOK_CONDITIONAL) {
12948 numptr_m1->contidional_second_val = rez;
12950 rez = numptr_m1->val;
12951 if (op == TOK_BOR || op == TOK_OR_ASSIGN)
12953 else if (op == TOK_OR)
12954 rez = numptr_val || rez;
12955 else if (op == TOK_BAND || op == TOK_AND_ASSIGN)
12957 else if (op == TOK_BXOR || op == TOK_XOR_ASSIGN)
12959 else if (op == TOK_AND)
12960 rez = rez && numptr_val;
12961 else if (op == TOK_EQ)
12962 rez = (rez == numptr_val);
12963 else if (op == TOK_NE)
12964 rez = (rez != numptr_val);
12965 else if (op == TOK_GE)
12966 rez = (rez >= numptr_val);
12967 else if (op == TOK_RSHIFT || op == TOK_RSHIFT_ASSIGN)
12968 rez >>= numptr_val;
12969 else if (op == TOK_LSHIFT || op == TOK_LSHIFT_ASSIGN)
12970 rez <<= numptr_val;
12971 else if (op == TOK_GT)
12972 rez = (rez > numptr_val);
12973 else if (op == TOK_LT)
12974 rez = (rez < numptr_val);
12975 else if (op == TOK_LE)
12976 rez = (rez <= numptr_val);
12977 else if (op == TOK_MUL || op == TOK_MUL_ASSIGN)
12979 else if (op == TOK_ADD || op == TOK_PLUS_ASSIGN)
12981 else if (op == TOK_SUB || op == TOK_MINUS_ASSIGN)
12983 else if (op == TOK_ASSIGN || op == TOK_COMMA)
12985 else if (op == TOK_CONDITIONAL_SEP) {
12986 if (numptr_m1 == numstack) {
12987 /* protect $((expr : expr)) without "expr ? " */
12990 numptr_m1->contidional_second_val_initialized = op;
12991 numptr_m1->contidional_second_val = numptr_val;
12992 } else if (op == TOK_CONDITIONAL) {
12994 numptr_val : numptr_m1->contidional_second_val;
12995 } else if (op == TOK_EXPONENT) {
12996 if (numptr_val < 0)
12997 return -3; /* exponent less than 0 */
13002 while (numptr_val--)
13006 } else if (numptr_val==0) /* zero divisor check */
13008 else if (op == TOK_DIV || op == TOK_DIV_ASSIGN)
13010 else if (op == TOK_REM || op == TOK_REM_ASSIGN)
13013 if (tok_have_assign(op)) {
13014 char buf[sizeof(arith_t_type)*3 + 2];
13016 if (numptr_m1->var == NULL) {
13020 /* save to shell variable */
13021 #if ENABLE_ASH_MATH_SUPPORT_64
13022 snprintf(buf, sizeof(buf), "%lld", (arith_t_type) rez);
13024 snprintf(buf, sizeof(buf), "%ld", (arith_t_type) rez);
13026 setvar(numptr_m1->var, buf, 0);
13027 /* after saving, make previous value for v++ or v-- */
13028 if (op == TOK_POST_INC)
13030 else if (op == TOK_POST_DEC)
13033 numptr_m1->val = rez;
13034 /* protect geting var value, is number now */
13035 numptr_m1->var = NULL;
13041 /* longest must be first */
13042 static const char op_tokens[] ALIGN1 = {
13043 '<','<','=',0, TOK_LSHIFT_ASSIGN,
13044 '>','>','=',0, TOK_RSHIFT_ASSIGN,
13045 '<','<', 0, TOK_LSHIFT,
13046 '>','>', 0, TOK_RSHIFT,
13047 '|','|', 0, TOK_OR,
13048 '&','&', 0, TOK_AND,
13049 '!','=', 0, TOK_NE,
13050 '<','=', 0, TOK_LE,
13051 '>','=', 0, TOK_GE,
13052 '=','=', 0, TOK_EQ,
13053 '|','=', 0, TOK_OR_ASSIGN,
13054 '&','=', 0, TOK_AND_ASSIGN,
13055 '*','=', 0, TOK_MUL_ASSIGN,
13056 '/','=', 0, TOK_DIV_ASSIGN,
13057 '%','=', 0, TOK_REM_ASSIGN,
13058 '+','=', 0, TOK_PLUS_ASSIGN,
13059 '-','=', 0, TOK_MINUS_ASSIGN,
13060 '-','-', 0, TOK_POST_DEC,
13061 '^','=', 0, TOK_XOR_ASSIGN,
13062 '+','+', 0, TOK_POST_INC,
13063 '*','*', 0, TOK_EXPONENT,
13067 '=', 0, TOK_ASSIGN,
13079 '?', 0, TOK_CONDITIONAL,
13080 ':', 0, TOK_CONDITIONAL_SEP,
13081 ')', 0, TOK_RPAREN,
13082 '(', 0, TOK_LPAREN,
13086 #define endexpression (&op_tokens[sizeof(op_tokens)-7])
13089 arith(const char *expr, int *perrcode)
13091 char arithval; /* Current character under analysis */
13092 operator lasttok, op;
13094 operator *stack, *stackptr;
13095 const char *p = endexpression;
13097 v_n_t *numstack, *numstackptr;
13098 unsigned datasizes = strlen(expr) + 2;
13100 /* Stack of integers */
13101 /* The proof that there can be no more than strlen(startbuf)/2+1 integers
13102 * in any given correct or incorrect expression is left as an exercise to
13104 numstackptr = numstack = alloca((datasizes / 2) * sizeof(numstack[0]));
13105 /* Stack of operator tokens */
13106 stackptr = stack = alloca(datasizes * sizeof(stack[0]));
13108 *stackptr++ = lasttok = TOK_LPAREN; /* start off with a left paren */
13109 *perrcode = errcode = 0;
13113 if (arithval == 0) {
13114 if (p == endexpression) {
13115 /* Null expression. */
13119 /* This is only reached after all tokens have been extracted from the
13120 * input stream. If there are still tokens on the operator stack, they
13121 * are to be applied in order. At the end, there should be a final
13122 * result on the integer stack */
13124 if (expr != endexpression + 1) {
13125 /* If we haven't done so already, */
13126 /* append a closing right paren */
13127 expr = endexpression;
13128 /* and let the loop process it. */
13131 /* At this point, we're done with the expression. */
13132 if (numstackptr != numstack+1) {
13133 /* ... but if there isn't, it's bad */
13138 if (numstack->var) {
13139 /* expression is $((var)) only, lookup now */
13140 errcode = arith_lookup_val(numstack);
13143 *perrcode = errcode;
13144 return numstack->val;
13147 /* Continue processing the expression. */
13148 if (arith_isspace(arithval)) {
13149 /* Skip whitespace */
13152 p = endofname(expr);
13154 size_t var_name_size = (p-expr) + 1; /* trailing zero */
13156 numstackptr->var = alloca(var_name_size);
13157 safe_strncpy(numstackptr->var, expr, var_name_size);
13160 numstackptr->contidional_second_val_initialized = 0;
13165 if (isdigit(arithval)) {
13166 numstackptr->var = NULL;
13167 #if ENABLE_ASH_MATH_SUPPORT_64
13168 numstackptr->val = strtoll(expr, (char **) &expr, 0);
13170 numstackptr->val = strtol(expr, (char **) &expr, 0);
13174 for (p = op_tokens; ; p++) {
13178 /* strange operator not found */
13181 for (o = expr; *p && *o == *p; p++)
13188 /* skip tail uncompared token */
13191 /* skip zero delim */
13196 /* post grammar: a++ reduce to num */
13197 if (lasttok == TOK_POST_INC || lasttok == TOK_POST_DEC)
13200 /* Plus and minus are binary (not unary) _only_ if the last
13201 * token was as number, or a right paren (which pretends to be
13202 * a number, since it evaluates to one). Think about it.
13203 * It makes sense. */
13204 if (lasttok != TOK_NUM) {
13220 /* We don't want a unary operator to cause recursive descent on the
13221 * stack, because there can be many in a row and it could cause an
13222 * operator to be evaluated before its argument is pushed onto the
13223 * integer stack. */
13224 /* But for binary operators, "apply" everything on the operator
13225 * stack until we find an operator with a lesser priority than the
13226 * one we have just extracted. */
13227 /* Left paren is given the lowest priority so it will never be
13228 * "applied" in this way.
13229 * if associativity is right and priority eq, applied also skip
13232 if ((prec > 0 && prec < UNARYPREC) || prec == SPEC_PREC) {
13233 /* not left paren or unary */
13234 if (lasttok != TOK_NUM) {
13235 /* binary op must be preceded by a num */
13238 while (stackptr != stack) {
13239 if (op == TOK_RPAREN) {
13240 /* The algorithm employed here is simple: while we don't
13241 * hit an open paren nor the bottom of the stack, pop
13242 * tokens and apply them */
13243 if (stackptr[-1] == TOK_LPAREN) {
13245 /* Any operator directly after a */
13247 /* close paren should consider itself binary */
13251 operator prev_prec = PREC(stackptr[-1]);
13253 convert_prec_is_assing(prec);
13254 convert_prec_is_assing(prev_prec);
13255 if (prev_prec < prec)
13257 /* check right assoc */
13258 if (prev_prec == prec && is_right_associativity(prec))
13261 errcode = arith_apply(*--stackptr, numstack, &numstackptr);
13262 if (errcode) goto ret;
13264 if (op == TOK_RPAREN) {
13269 /* Push this operator to the stack and remember it. */
13270 *stackptr++ = lasttok = op;
13275 #endif /* ASH_MATH_SUPPORT */
13278 /* ============ main() and helpers */
13281 * Called to exit the shell.
13283 static void exitshell(void) NORETURN;
13291 status = exitstatus;
13292 TRACE(("pid %d, exitshell(%d)\n", getpid(), status));
13293 if (setjmp(loc.loc)) {
13294 if (exception == EXEXIT)
13295 /* dash bug: it just does _exit(exitstatus) here
13296 * but we have to do setjobctl(0) first!
13297 * (bug is still not fixed in dash-0.5.3 - if you run dash
13298 * under Midnight Commander, on exit from dash MC is backgrounded) */
13299 status = exitstatus;
13302 exception_handler = &loc;
13308 flush_stdout_stderr();
13318 /* from input.c: */
13319 basepf.nextc = basepf.buf = basebuf;
13322 signal(SIGCHLD, SIG_DFL);
13327 char ppid[sizeof(int)*3 + 1];
13329 struct stat st1, st2;
13332 for (envp = environ; envp && *envp; envp++) {
13333 if (strchr(*envp, '=')) {
13334 setvareq(*envp, VEXPORT|VTEXTFIXED);
13338 snprintf(ppid, sizeof(ppid), "%u", (unsigned) getppid());
13339 setvar("PPID", ppid, 0);
13341 p = lookupvar("PWD");
13343 if (*p != '/' || stat(p, &st1) || stat(".", &st2)
13344 || st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino)
13351 * Process the shell command line arguments.
13354 procargs(char **argv)
13357 const char *xminusc;
13362 /* if (xargv[0]) - mmm, this is always true! */
13364 for (i = 0; i < NOPTS; i++)
13368 /* it already printed err message */
13369 raise_exception(EXERROR);
13373 if (*xargv == NULL) {
13375 ash_msg_and_raise_error(bb_msg_requires_arg, "-c");
13378 if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
13382 for (i = 0; i < NOPTS; i++)
13383 if (optlist[i] == 2)
13388 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
13393 } else if (!sflag) {
13394 setinputfile(*xargv, 0);
13397 commandname = arg0;
13400 shellparam.p = xargv;
13401 #if ENABLE_ASH_GETOPTS
13402 shellparam.optind = 1;
13403 shellparam.optoff = -1;
13405 /* assert(shellparam.malloced == 0 && shellparam.nparam == 0); */
13407 shellparam.nparam++;
13414 * Read /etc/profile or .profile.
13417 read_profile(const char *name)
13421 if (setinputfile(name, INPUT_PUSH_FILE | INPUT_NOFILE_OK) < 0)
13430 * This routine is called when an error or an interrupt occurs in an
13431 * interactive shell and control is returned to the main command loop.
13439 /* from input.c: */
13440 parselleft = parsenleft = 0; /* clear input buffer */
13442 /* from parser.c: */
13445 /* from redir.c: */
13450 static short profile_buf[16384];
13451 extern int etext();
13455 * Main routine. We initialize things, parse the arguments, execute
13456 * profiles if we're a login shell, and then call cmdloop to execute
13457 * commands. The setjmp call sets up the location to jump to when an
13458 * exception occurs. When an exception occurs the variable "state"
13459 * is used to figure out how far we had gotten.
13461 int ash_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
13462 int ash_main(int argc UNUSED_PARAM, char **argv)
13465 volatile int state;
13466 struct jmploc jmploc;
13467 struct stackmark smark;
13469 /* Initialize global data */
13473 #if ENABLE_ASH_ALIAS
13479 monitor(4, etext, profile_buf, sizeof(profile_buf), 50);
13482 #if ENABLE_FEATURE_EDITING
13483 line_input_state = new_line_input_t(FOR_SHELL | WITH_PATH_LOOKUP);
13486 if (setjmp(jmploc.loc)) {
13496 if (e == EXEXIT || s == 0 || iflag == 0 || shlvl)
13500 outcslow('\n', stderr);
13502 popstackmark(&smark);
13503 FORCE_INT_ON; /* enable interrupts */
13512 exception_handler = &jmploc;
13515 trace_puts("Shell args: ");
13516 trace_puts_args(argv);
13518 rootpid = getpid();
13520 #if ENABLE_ASH_RANDOM_SUPPORT
13521 /* Can use monotonic_ns() for better randomness but for now it is
13522 * not used anywhere else in busybox... so avoid bloat */
13523 random_galois_LFSR = random_LCG = rootpid + monotonic_us();
13526 setstackmark(&smark);
13529 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
13531 const char *hp = lookupvar("HISTFILE");
13534 hp = lookupvar("HOME");
13536 char *defhp = concat_path_file(hp, ".ash_history");
13537 setvar("HISTFILE", defhp, 0);
13543 if (argv[0] && argv[0][0] == '-')
13547 read_profile("/etc/profile");
13550 read_profile(".profile");
13556 getuid() == geteuid() && getgid() == getegid() &&
13560 shinit = lookupvar("ENV");
13561 if (shinit != NULL && *shinit != '\0') {
13562 read_profile(shinit);
13568 evalstring(minusc, 0);
13570 if (sflag || minusc == NULL) {
13571 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
13573 const char *hp = lookupvar("HISTFILE");
13576 line_input_state->hist_file = hp;
13579 state4: /* XXX ??? - why isn't this before the "if" statement */
13587 extern void _mcleanup(void);
13596 const char *applet_name = "debug stuff usage";
13597 int main(int argc, char **argv)
13599 return ash_main(argc, argv);
13605 * Copyright (c) 1989, 1991, 1993, 1994
13606 * The Regents of the University of California. All rights reserved.
13608 * This code is derived from software contributed to Berkeley by
13609 * Kenneth Almquist.
13611 * Redistribution and use in source and binary forms, with or without
13612 * modification, are permitted provided that the following conditions
13614 * 1. Redistributions of source code must retain the above copyright
13615 * notice, this list of conditions and the following disclaimer.
13616 * 2. Redistributions in binary form must reproduce the above copyright
13617 * notice, this list of conditions and the following disclaimer in the
13618 * documentation and/or other materials provided with the distribution.
13619 * 3. Neither the name of the University nor the names of its contributors
13620 * may be used to endorse or promote products derived from this software
13621 * without specific prior written permission.
13623 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
13624 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
13625 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
13626 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
13627 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
13628 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
13629 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
13630 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
13631 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
13632 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF