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]; /* offset by 1: "signal" 0 is meaningless */
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) /* remembering was not requested */
4895 for (i = 0; i < rp->pair_count; i++) {
4896 if (rp->two_fd[i].orig == fd) {
4897 /* already remembered */
4904 /* "hidden" fd is a fd used to read scripts, or a copy of such */
4905 static int is_hidden_fd(struct redirtab *rp, int fd)
4908 struct parsefile *pf = g_parsefile;
4917 fd |= COPYFD_RESTORE;
4918 for (i = 0; i < rp->pair_count; i++) {
4919 if (rp->two_fd[i].copy == fd) {
4927 * Process a list of redirection commands. If the REDIR_PUSH flag is set,
4928 * old file descriptors are stashed away so that the redirection can be
4929 * undone by calling popredir. If the REDIR_BACKQ flag is set, then the
4930 * standard output, and the standard error if it becomes a duplicate of
4931 * stdout, is saved in memory.
4933 /* flags passed to redirect */
4934 #define REDIR_PUSH 01 /* save previous values of file descriptors */
4935 #define REDIR_SAVEFD2 03 /* set preverrout */
4937 redirect(union node *redir, int flags)
4939 struct redirtab *sv;
4944 int copied_fd2 = -1;
4954 if (flags & REDIR_PUSH) {
4955 union node *tmp = redir;
4958 tmp = tmp->nfile.next;
4960 sv = ckmalloc(sizeof(*sv) + sv_pos * sizeof(sv->two_fd[0]));
4961 sv->next = redirlist;
4962 sv->pair_count = sv_pos;
4964 sv->nullredirs = g_nullredirs - 1;
4966 while (sv_pos > 0) {
4968 sv->two_fd[sv_pos].orig = sv->two_fd[sv_pos].copy = EMPTY;
4973 fd = redir->nfile.fd;
4974 if (redir->nfile.type == NTOFD || redir->nfile.type == NFROMFD) {
4975 int right_fd = redir->ndup.dupfd;
4976 /* redirect from/to same file descriptor? */
4979 /* echo >&10 and 10 is a fd opened to the sh script? */
4980 if (is_hidden_fd(sv, right_fd)) {
4981 errno = EBADF; /* as if it is closed */
4982 ash_msg_and_raise_error("%d: %m", right_fd);
4986 newfd = openredirect(redir); /* always >= 0 */
4988 /* Descriptor wasn't open before redirect.
4989 * Mark it for close in the future */
4990 if (need_to_remember(sv, fd)) {
4991 goto remember_to_close;
4996 if (need_to_remember(sv, fd)) {
4997 /* Copy old descriptor */
4998 i = fcntl(fd, F_DUPFD, 10);
4999 /* You'd expect copy to be CLOEXECed. Currently these extra "saved" fds
5000 * are closed in popredir() in the child, preventing them from leaking
5001 * into child. (popredir() also cleans up the mess in case of failures)
5006 /* Strange error (e.g. "too many files" EMFILE?) */
5010 ash_msg_and_raise_error("%d: %m", fd);
5013 /* EBADF: it is not open - good, remember to close it */
5016 } else { /* fd is open, save its copy */
5017 /* "exec fd>&-" should not close fds
5018 * which point to script file(s).
5019 * Force them to be restored afterwards */
5020 if (is_hidden_fd(sv, fd))
5021 i |= COPYFD_RESTORE;
5025 sv->two_fd[sv_pos].orig = fd;
5026 sv->two_fd[sv_pos].copy = i;
5030 /* NTOFD/NFROMFD: copy redir->ndup.dupfd to fd */
5031 if (redir->ndup.dupfd < 0) { /* "fd>&-" */
5034 copyfd(redir->ndup.dupfd, fd | COPYFD_EXACT);
5036 } else if (fd != newfd) { /* move newfd to fd */
5037 copyfd(newfd, fd | COPYFD_EXACT);
5040 } while ((redir = redir->nfile.next) != NULL);
5043 if ((flags & REDIR_SAVEFD2) && copied_fd2 >= 0)
5044 preverrout_fd = copied_fd2;
5048 * Undo the effects of the last redirection.
5053 struct redirtab *rp;
5056 if (--g_nullredirs >= 0)
5060 for (i = 0; i < rp->pair_count; i++) {
5061 int fd = rp->two_fd[i].orig;
5062 int copy = rp->two_fd[i].copy;
5063 if (copy == CLOSED) {
5068 if (copy != EMPTY) {
5069 if (!drop || (copy & COPYFD_RESTORE)) {
5070 copy &= ~COPYFD_RESTORE;
5072 copyfd(copy, fd | COPYFD_EXACT);
5077 redirlist = rp->next;
5078 g_nullredirs = rp->nullredirs;
5084 * Undo all redirections. Called on error or interrupt.
5088 * Discard all saved file descriptors.
5091 clearredir(int drop)
5102 redirectsafe(union node *redir, int flags)
5105 volatile int saveint;
5106 struct jmploc *volatile savehandler = exception_handler;
5107 struct jmploc jmploc;
5110 /* "echo 9>/dev/null; echo >&9; echo result: $?" - result should be 1, not 2! */
5111 err = setjmp(jmploc.loc); // huh?? was = setjmp(jmploc.loc) * 2;
5113 exception_handler = &jmploc;
5114 redirect(redir, flags);
5116 exception_handler = savehandler;
5117 if (err && exception != EXERROR)
5118 longjmp(exception_handler->loc, 1);
5119 RESTORE_INT(saveint);
5124 /* ============ Routines to expand arguments to commands
5126 * We have to deal with backquotes, shell variables, and file metacharacters.
5129 #if ENABLE_ASH_MATH_SUPPORT_64
5130 typedef int64_t arith_t;
5131 #define arith_t_type long long
5133 typedef long arith_t;
5134 #define arith_t_type long
5137 #if ENABLE_ASH_MATH_SUPPORT
5138 static arith_t dash_arith(const char *);
5139 static arith_t arith(const char *expr, int *perrcode);
5145 #define EXP_FULL 0x1 /* perform word splitting & file globbing */
5146 #define EXP_TILDE 0x2 /* do normal tilde expansion */
5147 #define EXP_VARTILDE 0x4 /* expand tildes in an assignment */
5148 #define EXP_REDIR 0x8 /* file glob for a redirection (1 match only) */
5149 #define EXP_CASE 0x10 /* keeps quotes around for CASE pattern */
5150 #define EXP_RECORD 0x20 /* need to record arguments for ifs breakup */
5151 #define EXP_VARTILDE2 0x40 /* expand tildes after colons only */
5152 #define EXP_WORD 0x80 /* expand word in parameter expansion */
5153 #define EXP_QWORD 0x100 /* expand word in quoted parameter expansion */
5157 #define RMESCAPE_ALLOC 0x1 /* Allocate a new string */
5158 #define RMESCAPE_GLOB 0x2 /* Add backslashes for glob */
5159 #define RMESCAPE_QUOTED 0x4 /* Remove CTLESC unless in quotes */
5160 #define RMESCAPE_GROW 0x8 /* Grow strings instead of stalloc */
5161 #define RMESCAPE_HEAP 0x10 /* Malloc strings instead of stalloc */
5164 * Structure specifying which parts of the string should be searched
5165 * for IFS characters.
5168 struct ifsregion *next; /* next region in list */
5169 int begoff; /* offset of start of region */
5170 int endoff; /* offset of end of region */
5171 int nulonly; /* search for nul bytes only */
5175 struct strlist *list;
5176 struct strlist **lastp;
5179 /* output of current string */
5180 static char *expdest;
5181 /* list of back quote expressions */
5182 static struct nodelist *argbackq;
5183 /* first struct in list of ifs regions */
5184 static struct ifsregion ifsfirst;
5185 /* last struct in list */
5186 static struct ifsregion *ifslastp;
5187 /* holds expanded arg list */
5188 static struct arglist exparg;
5198 expdest = makestrspace(32, expdest);
5199 #if ENABLE_ASH_MATH_SUPPORT_64
5200 len = fmtstr(expdest, 32, "%lld", (long long) num);
5202 len = fmtstr(expdest, 32, "%ld", num);
5204 STADJUST(len, expdest);
5209 esclen(const char *start, const char *p)
5213 while (p > start && *--p == CTLESC) {
5220 * Remove any CTLESC characters from a string.
5223 _rmescapes(char *str, int flag)
5225 static const char qchars[] ALIGN1 = { CTLESC, CTLQUOTEMARK, '\0' };
5232 p = strpbrk(str, qchars);
5238 if (flag & RMESCAPE_ALLOC) {
5239 size_t len = p - str;
5240 size_t fulllen = len + strlen(p) + 1;
5242 if (flag & RMESCAPE_GROW) {
5243 r = makestrspace(fulllen, expdest);
5244 } else if (flag & RMESCAPE_HEAP) {
5245 r = ckmalloc(fulllen);
5247 r = stalloc(fulllen);
5251 q = (char *)memcpy(q, str, len) + len;
5254 inquotes = (flag & RMESCAPE_QUOTED) ^ RMESCAPE_QUOTED;
5255 globbing = flag & RMESCAPE_GLOB;
5256 notescaped = globbing;
5258 if (*p == CTLQUOTEMARK) {
5259 inquotes = ~inquotes;
5261 notescaped = globbing;
5265 /* naked back slash */
5271 if (notescaped && inquotes && *p != '/') {
5275 notescaped = globbing;
5280 if (flag & RMESCAPE_GROW) {
5282 STADJUST(q - r + 1, expdest);
5286 #define rmescapes(p) _rmescapes((p), 0)
5288 #define pmatch(a, b) !fnmatch((a), (b), 0)
5291 * Prepare a pattern for a expmeta (internal glob(3)) call.
5293 * Returns an stalloced string.
5296 preglob(const char *pattern, int quoted, int flag)
5298 flag |= RMESCAPE_GLOB;
5300 flag |= RMESCAPE_QUOTED;
5302 return _rmescapes((char *)pattern, flag);
5306 * Put a string on the stack.
5309 memtodest(const char *p, size_t len, int syntax, int quotes)
5313 q = makestrspace(len * 2, q);
5316 int c = signed_char2int(*p++);
5319 if (quotes && (SIT(c, syntax) == CCTL || SIT(c, syntax) == CBACK))
5328 strtodest(const char *p, int syntax, int quotes)
5330 memtodest(p, strlen(p), syntax, quotes);
5334 * Record the fact that we have to scan this region of the
5335 * string for IFS characters.
5338 recordregion(int start, int end, int nulonly)
5340 struct ifsregion *ifsp;
5342 if (ifslastp == NULL) {
5346 ifsp = ckzalloc(sizeof(*ifsp));
5347 /*ifsp->next = NULL; - ckzalloc did it */
5348 ifslastp->next = ifsp;
5352 ifslastp->begoff = start;
5353 ifslastp->endoff = end;
5354 ifslastp->nulonly = nulonly;
5358 removerecordregions(int endoff)
5360 if (ifslastp == NULL)
5363 if (ifsfirst.endoff > endoff) {
5364 while (ifsfirst.next != NULL) {
5365 struct ifsregion *ifsp;
5367 ifsp = ifsfirst.next->next;
5368 free(ifsfirst.next);
5369 ifsfirst.next = ifsp;
5372 if (ifsfirst.begoff > endoff)
5375 ifslastp = &ifsfirst;
5376 ifsfirst.endoff = endoff;
5381 ifslastp = &ifsfirst;
5382 while (ifslastp->next && ifslastp->next->begoff < endoff)
5383 ifslastp=ifslastp->next;
5384 while (ifslastp->next != NULL) {
5385 struct ifsregion *ifsp;
5387 ifsp = ifslastp->next->next;
5388 free(ifslastp->next);
5389 ifslastp->next = ifsp;
5392 if (ifslastp->endoff > endoff)
5393 ifslastp->endoff = endoff;
5397 exptilde(char *startp, char *p, int flag)
5403 int quotes = flag & (EXP_FULL | EXP_CASE);
5408 while ((c = *++p) != '\0') {
5415 if (flag & EXP_VARTILDE)
5425 if (*name == '\0') {
5426 home = lookupvar(homestr);
5428 pw = getpwnam(name);
5433 if (!home || !*home)
5436 startloc = expdest - (char *)stackblock();
5437 strtodest(home, SQSYNTAX, quotes);
5438 recordregion(startloc, expdest - (char *)stackblock(), 0);
5446 * Execute a command inside back quotes. If it's a builtin command, we
5447 * want to save its output in a block obtained from malloc. Otherwise
5448 * we fork off a subprocess and get the output of the command via a pipe.
5449 * Should be called with interrupts off.
5451 struct backcmd { /* result of evalbackcmd */
5452 int fd; /* file descriptor to read from */
5453 int nleft; /* number of chars in buffer */
5454 char *buf; /* buffer */
5455 struct job *jp; /* job structure for command */
5458 /* These forward decls are needed to use "eval" code for backticks handling: */
5459 static uint8_t back_exitstatus; /* exit status of backquoted command */
5460 #define EV_EXIT 01 /* exit after evaluating tree */
5461 static void evaltree(union node *, int);
5464 evalbackcmd(union node *n, struct backcmd *result)
5476 saveherefd = herefd;
5484 ash_msg_and_raise_error("pipe call failed");
5485 jp = makejob(/*n,*/ 1);
5486 if (forkshell(jp, n, FORK_NOJOB) == 0) {
5491 copyfd(pip[1], 1 | COPYFD_EXACT);
5495 evaltree(n, EV_EXIT); /* actually evaltreenr... */
5499 result->fd = pip[0];
5502 herefd = saveherefd;
5504 TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n",
5505 result->fd, result->buf, result->nleft, result->jp));
5509 * Expand stuff in backwards quotes.
5512 expbackq(union node *cmd, int quoted, int quotes)
5520 int syntax = quoted ? DQSYNTAX : BASESYNTAX;
5521 struct stackmark smark;
5524 setstackmark(&smark);
5526 startloc = dest - (char *)stackblock();
5528 evalbackcmd(cmd, &in);
5529 popstackmark(&smark);
5536 memtodest(p, i, syntax, quotes);
5540 i = nonblock_safe_read(in.fd, buf, sizeof(buf));
5541 TRACE(("expbackq: read returns %d\n", i));
5550 back_exitstatus = waitforjob(in.jp);
5554 /* Eat all trailing newlines */
5556 for (; dest > (char *)stackblock() && dest[-1] == '\n';)
5561 recordregion(startloc, dest - (char *)stackblock(), 0);
5562 TRACE(("evalbackq: size=%d: \"%.*s\"\n",
5563 (dest - (char *)stackblock()) - startloc,
5564 (dest - (char *)stackblock()) - startloc,
5565 stackblock() + startloc));
5568 #if ENABLE_ASH_MATH_SUPPORT
5570 * Expand arithmetic expression. Backup to start of expression,
5571 * evaluate, place result in (backed up) result, adjust string position.
5584 * This routine is slightly over-complicated for
5585 * efficiency. Next we scan backwards looking for the
5586 * start of arithmetic.
5588 start = stackblock();
5595 while (*p != CTLARI) {
5599 ash_msg_and_raise_error("missing CTLARI (shouldn't happen)");
5604 esc = esclen(start, p);
5614 removerecordregions(begoff);
5623 len = cvtnum(dash_arith(p + 2));
5626 recordregion(begoff, begoff + len, 0);
5630 /* argstr needs it */
5631 static char *evalvar(char *p, int flag, struct strlist *var_str_list);
5634 * Perform variable and command substitution. If EXP_FULL is set, output CTLESC
5635 * characters to allow for further processing. Otherwise treat
5636 * $@ like $* since no splitting will be performed.
5638 * var_str_list (can be NULL) is a list of "VAR=val" strings which take precedence
5639 * over shell varables. Needed for "A=a B=$A; echo $B" case - we use it
5640 * for correct expansion of "B=$A" word.
5643 argstr(char *p, int flag, struct strlist *var_str_list)
5645 static const char spclchars[] ALIGN1 = {
5653 CTLBACKQ | CTLQUOTE,
5654 #if ENABLE_ASH_MATH_SUPPORT
5659 const char *reject = spclchars;
5661 int quotes = flag & (EXP_FULL | EXP_CASE); /* do CTLESC */
5662 int breakall = flag & EXP_WORD;
5667 if (!(flag & EXP_VARTILDE)) {
5669 } else if (flag & EXP_VARTILDE2) {
5674 if (flag & EXP_TILDE) {
5680 if (*q == CTLESC && (flag & EXP_QWORD))
5683 p = exptilde(p, q, flag);
5686 startloc = expdest - (char *)stackblock();
5688 length += strcspn(p + length, reject);
5690 if (c && (!(c & 0x80)
5691 #if ENABLE_ASH_MATH_SUPPORT
5695 /* c == '=' || c == ':' || c == CTLENDARI */
5700 expdest = stack_nputstr(p, length, expdest);
5701 newloc = expdest - (char *)stackblock();
5702 if (breakall && !inquotes && newloc > startloc) {
5703 recordregion(startloc, newloc, 0);
5714 if (flag & EXP_VARTILDE2) {
5718 flag |= EXP_VARTILDE2;
5723 * sort of a hack - expand tildes in variable
5724 * assignments (after the first '=' and after ':'s).
5733 case CTLENDVAR: /* ??? */
5736 /* "$@" syntax adherence hack */
5739 !memcmp(p, dolatstr, 4) &&
5740 (p[4] == CTLQUOTEMARK || (
5741 p[4] == CTLENDVAR &&
5742 p[5] == CTLQUOTEMARK
5745 p = evalvar(p + 1, flag, /* var_str_list: */ NULL) + 1;
5748 inquotes = !inquotes;
5761 p = evalvar(p, flag, var_str_list);
5765 case CTLBACKQ|CTLQUOTE:
5766 expbackq(argbackq->n, c, quotes);
5767 argbackq = argbackq->next;
5769 #if ENABLE_ASH_MATH_SUPPORT
5782 scanleft(char *startp, char *rmesc, char *rmescend UNUSED_PARAM, char *str, int quotes,
5785 // This commented out code was added by James Simmons <jsimmons@infradead.org>
5786 // as part of a larger change when he added support for ${var/a/b}.
5787 // However, it broke # and % operators:
5791 //echo ${var#ab} abcdcd abcdcd
5792 //echo ${var##ab} abcdcd abcdcd
5793 //echo ${var#a*b} abcdcd ababcdcd (!)
5794 //echo ${var##a*b} cdcd cdcd
5795 //echo ${var#?} babcdcd ababcdcd (!)
5796 //echo ${var##?} babcdcd babcdcd
5797 //echo ${var#*} ababcdcd babcdcd (!)
5799 //echo ${var%cd} ababcd ababcd
5800 //echo ${var%%cd} ababcd abab (!)
5801 //echo ${var%c*d} ababcd ababcd
5802 //echo ${var%%c*d} abab ababcdcd (!)
5803 //echo ${var%?} ababcdc ababcdc
5804 //echo ${var%%?} ababcdc ababcdcd (!)
5805 //echo ${var%*} ababcdcd ababcdcd
5808 // Commenting it back out helped. Remove it completely if it really
5811 char *loc, *loc2; //, *full;
5817 int match; // = strlen(str);
5818 const char *s = loc2;
5825 match = pmatch(str, s); // this line was deleted
5827 // // chop off end if its '*'
5828 // full = strrchr(str, '*');
5829 // if (full && full != str)
5832 // // If str starts with '*' replace with s.
5833 // if ((*str == '*') && strlen(s) >= match) {
5834 // full = xstrdup(s);
5835 // strncpy(full+strlen(s)-match+1, str+1, match-1);
5837 // full = xstrndup(str, match);
5838 // match = strncmp(s, full, strlen(full));
5842 if (match) // if (!match)
5844 if (quotes && *loc == CTLESC)
5853 scanright(char *startp, char *rmesc, char *rmescend, char *str, int quotes,
5860 for (loc = str - 1, loc2 = rmescend; loc >= startp; loc2--) {
5863 const char *s = loc2;
5868 match = pmatch(str, s);
5875 esc = esclen(startp, loc);
5886 static void varunset(const char *, const char *, const char *, int) NORETURN;
5888 varunset(const char *end, const char *var, const char *umsg, int varflags)
5894 msg = "parameter not set";
5896 if (*end == CTLENDVAR) {
5897 if (varflags & VSNUL)
5902 ash_msg_and_raise_error("%.*s: %s%s", end - var - 1, var, msg, tail);
5905 #if ENABLE_ASH_BASH_COMPAT
5907 parse_sub_pattern(char *arg, int inquotes)
5909 char *idx, *repl = NULL;
5918 /* Only the first '/' seen is our separator */
5925 if (!inquotes && c == '\\' && arg[1] == '\\')
5926 arg++; /* skip both \\, not just first one */
5933 #endif /* ENABLE_ASH_BASH_COMPAT */
5936 subevalvar(char *p, char *str, int strloc, int subtype,
5937 int startloc, int varflags, int quotes, struct strlist *var_str_list)
5939 struct nodelist *saveargbackq = argbackq;
5942 char *rmesc, *rmescend;
5943 USE_ASH_BASH_COMPAT(char *repl = NULL;)
5944 USE_ASH_BASH_COMPAT(char null = '\0';)
5945 USE_ASH_BASH_COMPAT(int pos, len, orig_len;)
5946 int saveherefd = herefd;
5947 int amount, workloc, resetloc;
5949 char *(*scan)(char*, char*, char*, char*, int, int);
5952 argstr(p, (subtype != VSASSIGN && subtype != VSQUESTION) ? EXP_CASE : 0,
5954 STPUTC('\0', expdest);
5955 herefd = saveherefd;
5956 argbackq = saveargbackq;
5957 startp = (char *)stackblock() + startloc;
5961 setvar(str, startp, 0);
5962 amount = startp - expdest;
5963 STADJUST(amount, expdest);
5966 #if ENABLE_ASH_BASH_COMPAT
5968 loc = str = stackblock() + strloc;
5969 // TODO: number() instead? It does error checking...
5971 len = str - startp - 1;
5973 /* *loc != '\0', guaranteed by parser */
5977 /* We must adjust the length by the number of escapes we find. */
5978 for (ptr = startp; ptr < (str - 1); ptr++) {
5979 if(*ptr == CTLESC) {
5987 if (*loc++ == ':') {
5988 // TODO: number() instead? It does error checking...
5992 while (*loc && *loc != ':')
5995 // TODO: number() instead? It does error checking...
5998 if (pos >= orig_len) {
6002 if (len > (orig_len - pos))
6003 len = orig_len - pos;
6005 for (str = startp; pos; str++, pos--) {
6006 if (quotes && *str == CTLESC)
6009 for (loc = startp; len; len--) {
6010 if (quotes && *str == CTLESC)
6015 amount = loc - expdest;
6016 STADJUST(amount, expdest);
6021 varunset(p, str, startp, varflags);
6024 resetloc = expdest - (char *)stackblock();
6026 /* We'll comeback here if we grow the stack while handling
6027 * a VSREPLACE or VSREPLACEALL, since our pointers into the
6028 * stack will need rebasing, and we'll need to remove our work
6031 USE_ASH_BASH_COMPAT(restart:)
6033 amount = expdest - ((char *)stackblock() + resetloc);
6034 STADJUST(-amount, expdest);
6035 startp = (char *)stackblock() + startloc;
6038 rmescend = (char *)stackblock() + strloc;
6040 rmesc = _rmescapes(startp, RMESCAPE_ALLOC | RMESCAPE_GROW);
6041 if (rmesc != startp) {
6043 startp = (char *)stackblock() + startloc;
6047 str = (char *)stackblock() + strloc;
6048 preglob(str, varflags & VSQUOTE, 0);
6049 workloc = expdest - (char *)stackblock();
6051 #if ENABLE_ASH_BASH_COMPAT
6052 if (subtype == VSREPLACE || subtype == VSREPLACEALL) {
6053 char *idx, *end, *restart_detect;
6056 repl = parse_sub_pattern(str, varflags & VSQUOTE);
6061 /* If there's no pattern to match, return the expansion unmolested */
6069 loc = scanright(idx, rmesc, rmescend, str, quotes, 1);
6071 /* No match, advance */
6072 restart_detect = stackblock();
6073 STPUTC(*idx, expdest);
6074 if (quotes && *idx == CTLESC) {
6077 STPUTC(*idx, expdest);
6079 if (stackblock() != restart_detect)
6087 if (subtype == VSREPLACEALL) {
6089 if (quotes && *idx == CTLESC)
6097 for (loc = repl; *loc; loc++) {
6098 restart_detect = stackblock();
6099 STPUTC(*loc, expdest);
6100 if (stackblock() != restart_detect)
6105 if (subtype == VSREPLACE) {
6107 restart_detect = stackblock();
6108 STPUTC(*idx, expdest);
6109 if (stackblock() != restart_detect)
6118 /* We've put the replaced text into a buffer at workloc, now
6119 * move it to the right place and adjust the stack.
6121 startp = stackblock() + startloc;
6122 STPUTC('\0', expdest);
6123 memmove(startp, stackblock() + workloc, len);
6124 startp[len++] = '\0';
6125 amount = expdest - ((char *)stackblock() + startloc + len - 1);
6126 STADJUST(-amount, expdest);
6129 #endif /* ENABLE_ASH_BASH_COMPAT */
6131 subtype -= VSTRIMRIGHT;
6133 if (subtype < 0 || subtype > 7)
6136 /* zero = subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX */
6137 zero = subtype >> 1;
6138 /* VSTRIMLEFT/VSTRIMRIGHTMAX -> scanleft */
6139 scan = (subtype & 1) ^ zero ? scanleft : scanright;
6141 loc = scan(startp, rmesc, rmescend, str, quotes, zero);
6144 memmove(startp, loc, str - loc);
6145 loc = startp + (str - loc) - 1;
6148 amount = loc - expdest;
6149 STADJUST(amount, expdest);
6155 * Add the value of a specialized variable to the stack string.
6158 varvalue(char *name, int varflags, int flags, struct strlist *var_str_list)
6168 int quoted = varflags & VSQUOTE;
6169 int subtype = varflags & VSTYPE;
6170 int quotes = flags & (EXP_FULL | EXP_CASE);
6172 if (quoted && (flags & EXP_FULL))
6173 sep = 1 << CHAR_BIT;
6175 syntax = quoted ? DQSYNTAX : BASESYNTAX;
6184 num = shellparam.nparam;
6194 p = makestrspace(NOPTS, expdest);
6195 for (i = NOPTS - 1; i >= 0; i--) {
6197 USTPUTC(optletters(i), p);
6208 sep = ifsset() ? signed_char2int(ifsval()[0]) : ' ';
6209 if (quotes && (SIT(sep, syntax) == CCTL || SIT(sep, syntax) == CBACK))
6215 while ((p = *ap++)) {
6218 partlen = strlen(p);
6221 if (!(subtype == VSPLUS || subtype == VSLENGTH))
6222 memtodest(p, partlen, syntax, quotes);
6228 if (subtype == VSPLUS || subtype == VSLENGTH) {
6249 // TODO: number() instead? It does error checking...
6251 if (num < 0 || num > shellparam.nparam)
6253 p = num ? shellparam.p[num - 1] : arg0;
6256 /* NB: name has form "VAR=..." */
6258 /* "A=a B=$A" case: var_str_list is a list of "A=a" strings
6259 * which should be considered before we check variables. */
6261 unsigned name_len = (strchrnul(name, '=') - name) + 1;
6265 str = var_str_list->text;
6266 eq = strchr(str, '=');
6267 if (!eq) /* stop at first non-assignment */
6270 if (name_len == (unsigned)(eq - str)
6271 && strncmp(str, name, name_len) == 0) {
6273 /* goto value; - WRONG! */
6274 /* think "A=1 A=2 B=$A" */
6276 var_str_list = var_str_list->next;
6277 } while (var_str_list);
6281 p = lookupvar(name);
6287 if (!(subtype == VSPLUS || subtype == VSLENGTH))
6288 memtodest(p, len, syntax, quotes);
6292 if (subtype == VSPLUS || subtype == VSLENGTH)
6293 STADJUST(-len, expdest);
6298 * Expand a variable, and return a pointer to the next character in the
6302 evalvar(char *p, int flag, struct strlist *var_str_list)
6314 subtype = varflags & VSTYPE;
6315 quoted = varflags & VSQUOTE;
6317 easy = (!quoted || (*var == '@' && shellparam.nparam));
6318 startloc = expdest - (char *)stackblock();
6319 p = strchr(p, '=') + 1;
6322 varlen = varvalue(var, varflags, flag, var_str_list);
6323 if (varflags & VSNUL)
6326 if (subtype == VSPLUS) {
6327 varlen = -1 - varlen;
6331 if (subtype == VSMINUS) {
6335 p, flag | EXP_TILDE |
6336 (quoted ? EXP_QWORD : EXP_WORD),
6346 if (subtype == VSASSIGN || subtype == VSQUESTION) {
6348 if (subevalvar(p, var, /* strloc: */ 0,
6349 subtype, startloc, varflags,
6355 * Remove any recorded regions beyond
6358 removerecordregions(startloc);
6368 if (varlen < 0 && uflag)
6369 varunset(p, var, 0, 0);
6371 if (subtype == VSLENGTH) {
6372 cvtnum(varlen > 0 ? varlen : 0);
6376 if (subtype == VSNORMAL) {
6387 case VSTRIMRIGHTMAX:
6388 #if ENABLE_ASH_BASH_COMPAT
6401 * Terminate the string and start recording the pattern
6404 STPUTC('\0', expdest);
6405 patloc = expdest - (char *)stackblock();
6406 if (0 == subevalvar(p, /* str: */ NULL, patloc, subtype,
6408 /* quotes: */ flag & (EXP_FULL | EXP_CASE),
6411 int amount = expdest - (
6412 (char *)stackblock() + patloc - 1
6414 STADJUST(-amount, expdest);
6416 /* Remove any recorded regions beyond start of variable */
6417 removerecordregions(startloc);
6419 recordregion(startloc, expdest - (char *)stackblock(), quoted);
6423 if (subtype != VSNORMAL) { /* skip to end of alternative */
6429 else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) {
6431 argbackq = argbackq->next;
6432 } else if (c == CTLVAR) {
6433 if ((*p++ & VSTYPE) != VSNORMAL)
6435 } else if (c == CTLENDVAR) {
6445 * Break the argument string into pieces based upon IFS and add the
6446 * strings to the argument list. The regions of the string to be
6447 * searched for IFS characters have been stored by recordregion.
6450 ifsbreakup(char *string, struct arglist *arglist)
6452 struct ifsregion *ifsp;
6457 const char *ifs, *realifs;
6462 if (ifslastp != NULL) {
6465 realifs = ifsset() ? ifsval() : defifs;
6468 p = string + ifsp->begoff;
6469 nulonly = ifsp->nulonly;
6470 ifs = nulonly ? nullstr : realifs;
6472 while (p < string + ifsp->endoff) {
6476 if (!strchr(ifs, *p)) {
6481 ifsspc = (strchr(defifs, *p) != NULL);
6482 /* Ignore IFS whitespace at start */
6483 if (q == start && ifsspc) {
6489 sp = stzalloc(sizeof(*sp));
6491 *arglist->lastp = sp;
6492 arglist->lastp = &sp->next;
6496 if (p >= string + ifsp->endoff) {
6502 if (strchr(ifs, *p) == NULL) {
6506 if (strchr(defifs, *p) == NULL) {
6521 } while (ifsp != NULL);
6530 sp = stzalloc(sizeof(*sp));
6532 *arglist->lastp = sp;
6533 arglist->lastp = &sp->next;
6539 struct ifsregion *p;
6544 struct ifsregion *ifsp;
6550 ifsfirst.next = NULL;
6555 * Add a file name to the list.
6558 addfname(const char *name)
6562 sp = stzalloc(sizeof(*sp));
6563 sp->text = ststrdup(name);
6565 exparg.lastp = &sp->next;
6568 static char *expdir;
6571 * Do metacharacter (i.e. *, ?, [...]) expansion.
6574 expmeta(char *enddir, char *name)
6589 for (p = name; *p; p++) {
6590 if (*p == '*' || *p == '?')
6592 else if (*p == '[') {
6599 if (*q == '/' || *q == '\0')
6606 } else if (*p == '\\')
6608 else if (*p == '/') {
6615 if (metaflag == 0) { /* we've reached the end of the file name */
6616 if (enddir != expdir)
6624 if (metaflag == 0 || lstat(expdir, &statb) >= 0)
6635 } while (p < start);
6637 if (enddir == expdir) {
6639 } else if (enddir == expdir + 1 && *expdir == '/') {
6648 if (enddir != expdir)
6650 if (*endname == 0) {
6662 while (!intpending && (dp = readdir(dirp)) != NULL) {
6663 if (dp->d_name[0] == '.' && !matchdot)
6665 if (pmatch(start, dp->d_name)) {
6667 strcpy(enddir, dp->d_name);
6670 for (p = enddir, cp = dp->d_name; (*p++ = *cp++) != '\0';)
6673 expmeta(p, endname);
6682 static struct strlist *
6683 msort(struct strlist *list, int len)
6685 struct strlist *p, *q = NULL;
6686 struct strlist **lpp;
6694 for (n = half; --n >= 0;) {
6698 q->next = NULL; /* terminate first half of list */
6699 q = msort(list, half); /* sort first half of list */
6700 p = msort(p, len - half); /* sort second half */
6703 #if ENABLE_LOCALE_SUPPORT
6704 if (strcoll(p->text, q->text) < 0)
6706 if (strcmp(p->text, q->text) < 0)
6730 * Sort the results of file name expansion. It calculates the number of
6731 * strings to sort and then calls msort (short for merge sort) to do the
6734 static struct strlist *
6735 expsort(struct strlist *str)
6741 for (sp = str; sp; sp = sp->next)
6743 return msort(str, len);
6747 expandmeta(struct strlist *str /*, int flag*/)
6749 static const char metachars[] ALIGN1 = {
6752 /* TODO - EXP_REDIR */
6755 struct strlist **savelastp;
6761 if (!strpbrk(str->text, metachars))
6763 savelastp = exparg.lastp;
6766 p = preglob(str->text, 0, RMESCAPE_ALLOC | RMESCAPE_HEAP);
6768 int i = strlen(str->text);
6769 expdir = ckmalloc(i < 2048 ? 2048 : i); /* XXX */
6777 if (exparg.lastp == savelastp) {
6782 *exparg.lastp = str;
6783 rmescapes(str->text);
6784 exparg.lastp = &str->next;
6786 *exparg.lastp = NULL;
6787 *savelastp = sp = expsort(*savelastp);
6788 while (sp->next != NULL)
6790 exparg.lastp = &sp->next;
6797 * Perform variable substitution and command substitution on an argument,
6798 * placing the resulting list of arguments in arglist. If EXP_FULL is true,
6799 * perform splitting and file name expansion. When arglist is NULL, perform
6800 * here document expansion.
6803 expandarg(union node *arg, struct arglist *arglist, int flag)
6808 argbackq = arg->narg.backquote;
6809 STARTSTACKSTR(expdest);
6810 ifsfirst.next = NULL;
6812 argstr(arg->narg.text, flag,
6813 /* var_str_list: */ arglist ? arglist->list : NULL);
6814 p = _STPUTC('\0', expdest);
6816 if (arglist == NULL) {
6817 return; /* here document expanded */
6819 p = grabstackstr(p);
6820 exparg.lastp = &exparg.list;
6824 if (flag & EXP_FULL) {
6825 ifsbreakup(p, &exparg);
6826 *exparg.lastp = NULL;
6827 exparg.lastp = &exparg.list;
6828 expandmeta(exparg.list /*, flag*/);
6830 if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */
6832 sp = stzalloc(sizeof(*sp));
6835 exparg.lastp = &sp->next;
6839 *exparg.lastp = NULL;
6841 *arglist->lastp = exparg.list;
6842 arglist->lastp = exparg.lastp;
6847 * Expand shell variables and backquotes inside a here document.
6850 expandhere(union node *arg, int fd)
6853 expandarg(arg, (struct arglist *)NULL, 0);
6854 full_write(fd, stackblock(), expdest - (char *)stackblock());
6858 * Returns true if the pattern matches the string.
6861 patmatch(char *pattern, const char *string)
6863 return pmatch(preglob(pattern, 0, 0), string);
6867 * See if a pattern matches in a case statement.
6870 casematch(union node *pattern, char *val)
6872 struct stackmark smark;
6875 setstackmark(&smark);
6876 argbackq = pattern->narg.backquote;
6877 STARTSTACKSTR(expdest);
6879 argstr(pattern->narg.text, EXP_TILDE | EXP_CASE,
6880 /* var_str_list: */ NULL);
6881 STACKSTRNUL(expdest);
6882 result = patmatch(stackblock(), val);
6883 popstackmark(&smark);
6888 /* ============ find_command */
6892 int (*builtin)(int, char **);
6893 /* unsigned flags; */
6895 #define IS_BUILTIN_SPECIAL(b) ((b)->name[0] & 1)
6896 /* "regular" builtins always take precedence over commands,
6897 * regardless of PATH=....%builtin... position */
6898 #define IS_BUILTIN_REGULAR(b) ((b)->name[0] & 2)
6899 #define IS_BUILTIN_ASSIGN(b) ((b)->name[0] & 4)
6902 smallint cmdtype; /* CMDxxx */
6905 /* index >= 0 for commands without path (slashes) */
6906 /* (TODO: what exactly does the value mean? PATH position?) */
6907 /* index == -1 for commands with slashes */
6908 /* index == (-2 - applet_no) for NOFORK applets */
6909 const struct builtincmd *cmd;
6910 struct funcnode *func;
6913 /* values of cmdtype */
6914 #define CMDUNKNOWN -1 /* no entry in table for command */
6915 #define CMDNORMAL 0 /* command is an executable program */
6916 #define CMDFUNCTION 1 /* command is a shell function */
6917 #define CMDBUILTIN 2 /* command is a shell builtin */
6919 /* action to find_command() */
6920 #define DO_ERR 0x01 /* prints errors */
6921 #define DO_ABS 0x02 /* checks absolute paths */
6922 #define DO_NOFUNC 0x04 /* don't return shell functions, for command */
6923 #define DO_ALTPATH 0x08 /* using alternate path */
6924 #define DO_ALTBLTIN 0x20 /* %builtin in alt. path */
6926 static void find_command(char *, struct cmdentry *, int, const char *);
6929 /* ============ Hashing commands */
6932 * When commands are first encountered, they are entered in a hash table.
6933 * This ensures that a full path search will not have to be done for them
6934 * on each invocation.
6936 * We should investigate converting to a linear search, even though that
6937 * would make the command name "hash" a misnomer.
6941 struct tblentry *next; /* next entry in hash chain */
6942 union param param; /* definition of builtin function */
6943 smallint cmdtype; /* CMDxxx */
6944 char rehash; /* if set, cd done since entry created */
6945 char cmdname[1]; /* name of command */
6948 static struct tblentry **cmdtable;
6949 #define INIT_G_cmdtable() do { \
6950 cmdtable = xzalloc(CMDTABLESIZE * sizeof(cmdtable[0])); \
6953 static int builtinloc = -1; /* index in path of %builtin, or -1 */
6957 tryexec(USE_FEATURE_SH_STANDALONE(int applet_no,) char *cmd, char **argv, char **envp)
6961 #if ENABLE_FEATURE_SH_STANDALONE
6962 if (applet_no >= 0) {
6963 if (APPLET_IS_NOEXEC(applet_no))
6964 run_applet_no_and_exit(applet_no, argv);
6965 /* re-exec ourselves with the new arguments */
6966 execve(bb_busybox_exec_path, argv, envp);
6967 /* If they called chroot or otherwise made the binary no longer
6968 * executable, fall through */
6975 execve(cmd, argv, envp);
6976 } while (errno == EINTR);
6978 execve(cmd, argv, envp);
6984 if (errno == ENOEXEC) {
6988 for (ap = argv; *ap; ap++)
6990 ap = new = ckmalloc((ap - argv + 2) * sizeof(ap[0]));
6992 ap[0] = cmd = (char *)DEFAULT_SHELL;
6995 while ((*ap++ = *argv++) != NULL)
7004 * Exec a program. Never returns. If you change this routine, you may
7005 * have to change the find_command routine as well.
7007 static void shellexec(char **, const char *, int) NORETURN;
7009 shellexec(char **argv, const char *path, int idx)
7015 #if ENABLE_FEATURE_SH_STANDALONE
7020 envp = listvars(VEXPORT, VUNSET, 0);
7021 if (strchr(argv[0], '/') != NULL
7022 #if ENABLE_FEATURE_SH_STANDALONE
7023 || (applet_no = find_applet_by_name(argv[0])) >= 0
7026 tryexec(USE_FEATURE_SH_STANDALONE(applet_no,) argv[0], argv, envp);
7030 while ((cmdname = padvance(&path, argv[0])) != NULL) {
7031 if (--idx < 0 && pathopt == NULL) {
7032 tryexec(USE_FEATURE_SH_STANDALONE(-1,) cmdname, argv, envp);
7033 if (errno != ENOENT && errno != ENOTDIR)
7040 /* Map to POSIX errors */
7052 exitstatus = exerrno;
7053 TRACE(("shellexec failed for %s, errno %d, suppressint %d\n",
7054 argv[0], e, suppressint));
7055 ash_msg_and_raise(EXEXEC, "%s: %s", argv[0], errmsg(e, "not found"));
7060 printentry(struct tblentry *cmdp)
7066 idx = cmdp->param.index;
7069 name = padvance(&path, cmdp->cmdname);
7071 } while (--idx >= 0);
7072 out1fmt("%s%s\n", name, (cmdp->rehash ? "*" : nullstr));
7076 * Clear out command entries. The argument specifies the first entry in
7077 * PATH which has changed.
7080 clearcmdentry(int firstchange)
7082 struct tblentry **tblp;
7083 struct tblentry **pp;
7084 struct tblentry *cmdp;
7087 for (tblp = cmdtable; tblp < &cmdtable[CMDTABLESIZE]; tblp++) {
7089 while ((cmdp = *pp) != NULL) {
7090 if ((cmdp->cmdtype == CMDNORMAL &&
7091 cmdp->param.index >= firstchange)
7092 || (cmdp->cmdtype == CMDBUILTIN &&
7093 builtinloc >= firstchange)
7106 * Locate a command in the command hash table. If "add" is nonzero,
7107 * add the command to the table if it is not already present. The
7108 * variable "lastcmdentry" is set to point to the address of the link
7109 * pointing to the entry, so that delete_cmd_entry can delete the
7112 * Interrupts must be off if called with add != 0.
7114 static struct tblentry **lastcmdentry;
7116 static struct tblentry *
7117 cmdlookup(const char *name, int add)
7119 unsigned int hashval;
7121 struct tblentry *cmdp;
7122 struct tblentry **pp;
7125 hashval = (unsigned char)*p << 4;
7127 hashval += (unsigned char)*p++;
7129 pp = &cmdtable[hashval % CMDTABLESIZE];
7130 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7131 if (strcmp(cmdp->cmdname, name) == 0)
7135 if (add && cmdp == NULL) {
7136 cmdp = *pp = ckzalloc(sizeof(struct tblentry)
7138 /* + 1 - already done because
7139 * tblentry::cmdname is char[1] */);
7140 /*cmdp->next = NULL; - ckzalloc did it */
7141 cmdp->cmdtype = CMDUNKNOWN;
7142 strcpy(cmdp->cmdname, name);
7149 * Delete the command entry returned on the last lookup.
7152 delete_cmd_entry(void)
7154 struct tblentry *cmdp;
7157 cmdp = *lastcmdentry;
7158 *lastcmdentry = cmdp->next;
7159 if (cmdp->cmdtype == CMDFUNCTION)
7160 freefunc(cmdp->param.func);
7166 * Add a new command entry, replacing any existing command entry for
7167 * the same name - except special builtins.
7170 addcmdentry(char *name, struct cmdentry *entry)
7172 struct tblentry *cmdp;
7174 cmdp = cmdlookup(name, 1);
7175 if (cmdp->cmdtype == CMDFUNCTION) {
7176 freefunc(cmdp->param.func);
7178 cmdp->cmdtype = entry->cmdtype;
7179 cmdp->param = entry->u;
7184 hashcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
7186 struct tblentry **pp;
7187 struct tblentry *cmdp;
7189 struct cmdentry entry;
7192 if (nextopt("r") != '\0') {
7197 if (*argptr == NULL) {
7198 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
7199 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7200 if (cmdp->cmdtype == CMDNORMAL)
7208 while ((name = *argptr) != NULL) {
7209 cmdp = cmdlookup(name, 0);
7211 && (cmdp->cmdtype == CMDNORMAL
7212 || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))
7216 find_command(name, &entry, DO_ERR, pathval());
7217 if (entry.cmdtype == CMDUNKNOWN)
7225 * Called when a cd is done. Marks all commands so the next time they
7226 * are executed they will be rehashed.
7231 struct tblentry **pp;
7232 struct tblentry *cmdp;
7234 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
7235 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7236 if (cmdp->cmdtype == CMDNORMAL
7237 || (cmdp->cmdtype == CMDBUILTIN
7238 && !IS_BUILTIN_REGULAR(cmdp->param.cmd)
7248 * Fix command hash table when PATH changed.
7249 * Called before PATH is changed. The argument is the new value of PATH;
7250 * pathval() still returns the old value at this point.
7251 * Called with interrupts off.
7254 changepath(const char *new)
7262 firstchange = 9999; /* assume no change */
7268 if ((*old == '\0' && *new == ':')
7269 || (*old == ':' && *new == '\0'))
7271 old = new; /* ignore subsequent differences */
7275 if (*new == '%' && idx_bltin < 0 && prefix(new + 1, "builtin"))
7281 if (builtinloc < 0 && idx_bltin >= 0)
7282 builtinloc = idx_bltin; /* zap builtins */
7283 if (builtinloc >= 0 && idx_bltin < 0)
7285 clearcmdentry(firstchange);
7286 builtinloc = idx_bltin;
7301 #define TENDBQUOTE 12
7318 typedef smallint token_id_t;
7320 /* first char is indicating which tokens mark the end of a list */
7321 static const char *const tokname_array[] = {
7335 #define KWDOFFSET 13
7336 /* the following are keywords */
7358 static char buf[16];
7361 //if (tok < TSEMI) return tokname_array[tok] + 1;
7362 //sprintf(buf, "\"%s\"", tokname_array[tok] + 1);
7367 sprintf(buf + (tok >= TSEMI), "%s%c",
7368 tokname_array[tok] + 1, (tok >= TSEMI ? '"' : 0));
7372 /* Wrapper around strcmp for qsort/bsearch/... */
7374 pstrcmp(const void *a, const void *b)
7376 return strcmp((char*) a, (*(char**) b) + 1);
7379 static const char *const *
7380 findkwd(const char *s)
7382 return bsearch(s, tokname_array + KWDOFFSET,
7383 ARRAY_SIZE(tokname_array) - KWDOFFSET,
7384 sizeof(tokname_array[0]), pstrcmp);
7388 * Locate and print what a word is...
7391 describe_command(char *command, int describe_command_verbose)
7393 struct cmdentry entry;
7394 struct tblentry *cmdp;
7395 #if ENABLE_ASH_ALIAS
7396 const struct alias *ap;
7398 const char *path = pathval();
7400 if (describe_command_verbose) {
7404 /* First look at the keywords */
7405 if (findkwd(command)) {
7406 out1str(describe_command_verbose ? " is a shell keyword" : command);
7410 #if ENABLE_ASH_ALIAS
7411 /* Then look at the aliases */
7412 ap = lookupalias(command, 0);
7414 if (!describe_command_verbose) {
7419 out1fmt(" is an alias for %s", ap->val);
7423 /* Then check if it is a tracked alias */
7424 cmdp = cmdlookup(command, 0);
7426 entry.cmdtype = cmdp->cmdtype;
7427 entry.u = cmdp->param;
7429 /* Finally use brute force */
7430 find_command(command, &entry, DO_ABS, path);
7433 switch (entry.cmdtype) {
7435 int j = entry.u.index;
7441 p = padvance(&path, command);
7445 if (describe_command_verbose) {
7447 (cmdp ? " a tracked alias for" : nullstr), p
7456 if (describe_command_verbose) {
7457 out1str(" is a shell function");
7464 if (describe_command_verbose) {
7465 out1fmt(" is a %sshell builtin",
7466 IS_BUILTIN_SPECIAL(entry.u.cmd) ?
7467 "special " : nullstr
7475 if (describe_command_verbose) {
7476 out1str(": not found\n");
7481 outstr("\n", stdout);
7486 typecmd(int argc UNUSED_PARAM, char **argv)
7492 /* type -p ... ? (we don't bother checking for 'p') */
7493 if (argv[1] && argv[1][0] == '-') {
7498 err |= describe_command(argv[i++], verbose);
7503 #if ENABLE_ASH_CMDCMD
7505 commandcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
7513 while ((c = nextopt("pvV")) != '\0')
7515 verify |= VERIFY_VERBOSE;
7517 verify |= VERIFY_BRIEF;
7522 /* Mimic bash: just "command -v" doesn't complain, it's a nop */
7523 if (verify && (*argptr != NULL)) {
7524 return describe_command(*argptr, verify - VERIFY_BRIEF);
7532 /* ============ eval.c */
7534 static int funcblocksize; /* size of structures in function */
7535 static int funcstringsize; /* size of strings in node */
7536 static void *funcblock; /* block to allocate function from */
7537 static char *funcstring; /* block to allocate strings from */
7539 /* flags in argument to evaltree */
7540 #define EV_EXIT 01 /* exit after evaluating tree */
7541 #define EV_TESTED 02 /* exit status is checked; ignore -e flag */
7542 #define EV_BACKCMD 04 /* command executing within back quotes */
7544 static const short nodesize[26] = {
7545 SHELL_ALIGN(sizeof(struct ncmd)),
7546 SHELL_ALIGN(sizeof(struct npipe)),
7547 SHELL_ALIGN(sizeof(struct nredir)),
7548 SHELL_ALIGN(sizeof(struct nredir)),
7549 SHELL_ALIGN(sizeof(struct nredir)),
7550 SHELL_ALIGN(sizeof(struct nbinary)),
7551 SHELL_ALIGN(sizeof(struct nbinary)),
7552 SHELL_ALIGN(sizeof(struct nbinary)),
7553 SHELL_ALIGN(sizeof(struct nif)),
7554 SHELL_ALIGN(sizeof(struct nbinary)),
7555 SHELL_ALIGN(sizeof(struct nbinary)),
7556 SHELL_ALIGN(sizeof(struct nfor)),
7557 SHELL_ALIGN(sizeof(struct ncase)),
7558 SHELL_ALIGN(sizeof(struct nclist)),
7559 SHELL_ALIGN(sizeof(struct narg)),
7560 SHELL_ALIGN(sizeof(struct narg)),
7561 SHELL_ALIGN(sizeof(struct nfile)),
7562 SHELL_ALIGN(sizeof(struct nfile)),
7563 SHELL_ALIGN(sizeof(struct nfile)),
7564 SHELL_ALIGN(sizeof(struct nfile)),
7565 SHELL_ALIGN(sizeof(struct nfile)),
7566 SHELL_ALIGN(sizeof(struct ndup)),
7567 SHELL_ALIGN(sizeof(struct ndup)),
7568 SHELL_ALIGN(sizeof(struct nhere)),
7569 SHELL_ALIGN(sizeof(struct nhere)),
7570 SHELL_ALIGN(sizeof(struct nnot)),
7573 static void calcsize(union node *n);
7576 sizenodelist(struct nodelist *lp)
7579 funcblocksize += SHELL_ALIGN(sizeof(struct nodelist));
7586 calcsize(union node *n)
7590 funcblocksize += nodesize[n->type];
7593 calcsize(n->ncmd.redirect);
7594 calcsize(n->ncmd.args);
7595 calcsize(n->ncmd.assign);
7598 sizenodelist(n->npipe.cmdlist);
7603 calcsize(n->nredir.redirect);
7604 calcsize(n->nredir.n);
7611 calcsize(n->nbinary.ch2);
7612 calcsize(n->nbinary.ch1);
7615 calcsize(n->nif.elsepart);
7616 calcsize(n->nif.ifpart);
7617 calcsize(n->nif.test);
7620 funcstringsize += strlen(n->nfor.var) + 1;
7621 calcsize(n->nfor.body);
7622 calcsize(n->nfor.args);
7625 calcsize(n->ncase.cases);
7626 calcsize(n->ncase.expr);
7629 calcsize(n->nclist.body);
7630 calcsize(n->nclist.pattern);
7631 calcsize(n->nclist.next);
7635 sizenodelist(n->narg.backquote);
7636 funcstringsize += strlen(n->narg.text) + 1;
7637 calcsize(n->narg.next);
7644 calcsize(n->nfile.fname);
7645 calcsize(n->nfile.next);
7649 calcsize(n->ndup.vname);
7650 calcsize(n->ndup.next);
7654 calcsize(n->nhere.doc);
7655 calcsize(n->nhere.next);
7658 calcsize(n->nnot.com);
7664 nodeckstrdup(char *s)
7666 char *rtn = funcstring;
7668 strcpy(funcstring, s);
7669 funcstring += strlen(s) + 1;
7673 static union node *copynode(union node *);
7675 static struct nodelist *
7676 copynodelist(struct nodelist *lp)
7678 struct nodelist *start;
7679 struct nodelist **lpp;
7684 funcblock = (char *) funcblock + SHELL_ALIGN(sizeof(struct nodelist));
7685 (*lpp)->n = copynode(lp->n);
7687 lpp = &(*lpp)->next;
7694 copynode(union node *n)
7701 funcblock = (char *) funcblock + nodesize[n->type];
7705 new->ncmd.redirect = copynode(n->ncmd.redirect);
7706 new->ncmd.args = copynode(n->ncmd.args);
7707 new->ncmd.assign = copynode(n->ncmd.assign);
7710 new->npipe.cmdlist = copynodelist(n->npipe.cmdlist);
7711 new->npipe.pipe_backgnd = n->npipe.pipe_backgnd;
7716 new->nredir.redirect = copynode(n->nredir.redirect);
7717 new->nredir.n = copynode(n->nredir.n);
7724 new->nbinary.ch2 = copynode(n->nbinary.ch2);
7725 new->nbinary.ch1 = copynode(n->nbinary.ch1);
7728 new->nif.elsepart = copynode(n->nif.elsepart);
7729 new->nif.ifpart = copynode(n->nif.ifpart);
7730 new->nif.test = copynode(n->nif.test);
7733 new->nfor.var = nodeckstrdup(n->nfor.var);
7734 new->nfor.body = copynode(n->nfor.body);
7735 new->nfor.args = copynode(n->nfor.args);
7738 new->ncase.cases = copynode(n->ncase.cases);
7739 new->ncase.expr = copynode(n->ncase.expr);
7742 new->nclist.body = copynode(n->nclist.body);
7743 new->nclist.pattern = copynode(n->nclist.pattern);
7744 new->nclist.next = copynode(n->nclist.next);
7748 new->narg.backquote = copynodelist(n->narg.backquote);
7749 new->narg.text = nodeckstrdup(n->narg.text);
7750 new->narg.next = copynode(n->narg.next);
7757 new->nfile.fname = copynode(n->nfile.fname);
7758 new->nfile.fd = n->nfile.fd;
7759 new->nfile.next = copynode(n->nfile.next);
7763 new->ndup.vname = copynode(n->ndup.vname);
7764 new->ndup.dupfd = n->ndup.dupfd;
7765 new->ndup.fd = n->ndup.fd;
7766 new->ndup.next = copynode(n->ndup.next);
7770 new->nhere.doc = copynode(n->nhere.doc);
7771 new->nhere.fd = n->nhere.fd;
7772 new->nhere.next = copynode(n->nhere.next);
7775 new->nnot.com = copynode(n->nnot.com);
7778 new->type = n->type;
7783 * Make a copy of a parse tree.
7785 static struct funcnode *
7786 copyfunc(union node *n)
7791 funcblocksize = offsetof(struct funcnode, n);
7794 blocksize = funcblocksize;
7795 f = ckmalloc(blocksize + funcstringsize);
7796 funcblock = (char *) f + offsetof(struct funcnode, n);
7797 funcstring = (char *) f + blocksize;
7804 * Define a shell function.
7807 defun(char *name, union node *func)
7809 struct cmdentry entry;
7812 entry.cmdtype = CMDFUNCTION;
7813 entry.u.func = copyfunc(func);
7814 addcmdentry(name, &entry);
7818 static int evalskip; /* set if we are skipping commands */
7819 /* reasons for skipping commands (see comment on breakcmd routine) */
7820 #define SKIPBREAK (1 << 0)
7821 #define SKIPCONT (1 << 1)
7822 #define SKIPFUNC (1 << 2)
7823 #define SKIPFILE (1 << 3)
7824 #define SKIPEVAL (1 << 4)
7825 static int skipcount; /* number of levels to skip */
7826 static int funcnest; /* depth of function calls */
7827 static int loopnest; /* current loop nesting level */
7829 /* forward decl way out to parsing code - dotrap needs it */
7830 static int evalstring(char *s, int mask);
7833 * Called to execute a trap. Perhaps we should avoid entering new trap
7834 * handlers while we are executing a trap handler.
7845 savestatus = exitstatus;
7849 for (i = 1, q = gotsig; i < NSIG; i++, q++) {
7857 skip = evalstring(p, SKIPEVAL);
7858 exitstatus = savestatus;
7866 /* forward declarations - evaluation is fairly recursive business... */
7867 static void evalloop(union node *, int);
7868 static void evalfor(union node *, int);
7869 static void evalcase(union node *, int);
7870 static void evalsubshell(union node *, int);
7871 static void expredir(union node *);
7872 static void evalpipe(union node *, int);
7873 static void evalcommand(union node *, int);
7874 static int evalbltin(const struct builtincmd *, int, char **);
7875 static void prehash(union node *);
7878 * Evaluate a parse tree. The value is left in the global variable
7882 evaltree(union node *n, int flags)
7885 struct jmploc *volatile savehandler = exception_handler;
7886 struct jmploc jmploc;
7888 void (*evalfn)(union node *, int);
7892 TRACE(("evaltree(NULL) called\n"));
7895 TRACE(("pid %d, evaltree(%p: %d, %d) called\n",
7896 getpid(), n, n->type, flags));
7898 exception_handler = &jmploc;
7900 int err = setjmp(jmploc.loc);
7902 /* if it was a signal, check for trap handlers */
7903 if (exception == EXSIG)
7905 /* continue on the way out */
7906 exception_handler = savehandler;
7907 longjmp(exception_handler->loc, err);
7914 out1fmt("Node type = %d\n", n->type);
7919 evaltree(n->nnot.com, EV_TESTED);
7920 status = !exitstatus;
7923 expredir(n->nredir.redirect);
7924 status = redirectsafe(n->nredir.redirect, REDIR_PUSH);
7926 evaltree(n->nredir.n, flags & EV_TESTED);
7927 status = exitstatus;
7932 evalfn = evalcommand;
7934 if (eflag && !(flags & EV_TESTED))
7946 evalfn = evalsubshell;
7959 #error NAND + 1 != NOR
7961 #if NOR + 1 != NSEMI
7962 #error NOR + 1 != NSEMI
7964 unsigned is_or = n->type - NAND;
7967 (flags | ((is_or >> 1) - 1)) & EV_TESTED
7969 if (!exitstatus == is_or)
7982 evaltree(n->nif.test, EV_TESTED);
7985 if (exitstatus == 0) {
7988 } else if (n->nif.elsepart) {
7989 n = n->nif.elsepart;
7994 defun(n->narg.text, n->narg.next);
7998 exitstatus = status;
8003 exception_handler = savehandler;
8005 if (checkexit & exitstatus)
8006 evalskip |= SKIPEVAL;
8007 else if (pendingsig && dotrap())
8010 if (flags & EV_EXIT) {
8012 raise_exception(EXEXIT);
8016 #if !defined(__alpha__) || (defined(__GNUC__) && __GNUC__ >= 3)
8019 void evaltreenr(union node *, int) __attribute__ ((alias("evaltree"),__noreturn__));
8022 evalloop(union node *n, int flags)
8032 evaltree(n->nbinary.ch1, EV_TESTED);
8035 if (evalskip == SKIPCONT && --skipcount <= 0) {
8039 if (evalskip == SKIPBREAK && --skipcount <= 0)
8044 if (n->type != NWHILE)
8048 evaltree(n->nbinary.ch2, flags);
8049 status = exitstatus;
8054 exitstatus = status;
8058 evalfor(union node *n, int flags)
8060 struct arglist arglist;
8063 struct stackmark smark;
8065 setstackmark(&smark);
8066 arglist.list = NULL;
8067 arglist.lastp = &arglist.list;
8068 for (argp = n->nfor.args; argp; argp = argp->narg.next) {
8069 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE | EXP_RECORD);
8074 *arglist.lastp = NULL;
8079 for (sp = arglist.list; sp; sp = sp->next) {
8080 setvar(n->nfor.var, sp->text, 0);
8081 evaltree(n->nfor.body, flags);
8083 if (evalskip == SKIPCONT && --skipcount <= 0) {
8087 if (evalskip == SKIPBREAK && --skipcount <= 0)
8094 popstackmark(&smark);
8098 evalcase(union node *n, int flags)
8102 struct arglist arglist;
8103 struct stackmark smark;
8105 setstackmark(&smark);
8106 arglist.list = NULL;
8107 arglist.lastp = &arglist.list;
8108 expandarg(n->ncase.expr, &arglist, EXP_TILDE);
8110 for (cp = n->ncase.cases; cp && evalskip == 0; cp = cp->nclist.next) {
8111 for (patp = cp->nclist.pattern; patp; patp = patp->narg.next) {
8112 if (casematch(patp, arglist.list->text)) {
8113 if (evalskip == 0) {
8114 evaltree(cp->nclist.body, flags);
8121 popstackmark(&smark);
8125 * Kick off a subshell to evaluate a tree.
8128 evalsubshell(union node *n, int flags)
8131 int backgnd = (n->type == NBACKGND);
8134 expredir(n->nredir.redirect);
8135 if (!backgnd && flags & EV_EXIT && !trap[0])
8138 jp = makejob(/*n,*/ 1);
8139 if (forkshell(jp, n, backgnd) == 0) {
8143 flags &=~ EV_TESTED;
8145 redirect(n->nredir.redirect, 0);
8146 evaltreenr(n->nredir.n, flags);
8151 status = waitforjob(jp);
8152 exitstatus = status;
8157 * Compute the names of the files in a redirection list.
8159 static void fixredir(union node *, const char *, int);
8161 expredir(union node *n)
8165 for (redir = n; redir; redir = redir->nfile.next) {
8169 fn.lastp = &fn.list;
8170 switch (redir->type) {
8176 expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR);
8177 redir->nfile.expfname = fn.list->text;
8181 if (redir->ndup.vname) {
8182 expandarg(redir->ndup.vname, &fn, EXP_FULL | EXP_TILDE);
8183 if (fn.list == NULL)
8184 ash_msg_and_raise_error("redir error");
8185 fixredir(redir, fn.list->text, 1);
8193 * Evaluate a pipeline. All the processes in the pipeline are children
8194 * of the process creating the pipeline. (This differs from some versions
8195 * of the shell, which make the last process in a pipeline the parent
8199 evalpipe(union node *n, int flags)
8202 struct nodelist *lp;
8207 TRACE(("evalpipe(0x%lx) called\n", (long)n));
8209 for (lp = n->npipe.cmdlist; lp; lp = lp->next)
8213 jp = makejob(/*n,*/ pipelen);
8215 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
8219 if (pipe(pip) < 0) {
8221 ash_msg_and_raise_error("pipe call failed");
8224 if (forkshell(jp, lp->n, n->npipe.pipe_backgnd) == 0) {
8237 evaltreenr(lp->n, flags);
8245 if (n->npipe.pipe_backgnd == 0) {
8246 exitstatus = waitforjob(jp);
8247 TRACE(("evalpipe: job done exit status %d\n", exitstatus));
8253 * Controls whether the shell is interactive or not.
8256 setinteractive(int on)
8258 static smallint is_interactive;
8260 if (++on == is_interactive)
8262 is_interactive = on;
8266 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
8267 if (is_interactive > 1) {
8268 /* Looks like they want an interactive shell */
8269 static smallint did_banner;
8274 "%s built-in shell (ash)\n"
8275 "Enter 'help' for a list of built-in commands."
8290 setinteractive(iflag);
8292 #if ENABLE_FEATURE_EDITING_VI
8294 line_input_state->flags |= VI_MODE;
8296 line_input_state->flags &= ~VI_MODE;
8298 viflag = 0; /* forcibly keep the option off */
8302 static struct localvar *localvars;
8305 * Called after a function returns.
8306 * Interrupts must be off.
8311 struct localvar *lvp;
8314 while ((lvp = localvars) != NULL) {
8315 localvars = lvp->next;
8317 TRACE(("poplocalvar %s", vp ? vp->text : "-"));
8318 if (vp == NULL) { /* $- saved */
8319 memcpy(optlist, lvp->text, sizeof(optlist));
8320 free((char*)lvp->text);
8322 } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) {
8326 (*vp->func)(strchrnul(lvp->text, '=') + 1);
8327 if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
8328 free((char*)vp->text);
8329 vp->flags = lvp->flags;
8330 vp->text = lvp->text;
8337 evalfun(struct funcnode *func, int argc, char **argv, int flags)
8339 volatile struct shparam saveparam;
8340 struct localvar *volatile savelocalvars;
8341 struct jmploc *volatile savehandler;
8342 struct jmploc jmploc;
8345 saveparam = shellparam;
8346 savelocalvars = localvars;
8347 e = setjmp(jmploc.loc);
8352 savehandler = exception_handler;
8353 exception_handler = &jmploc;
8355 shellparam.malloced = 0;
8359 shellparam.nparam = argc - 1;
8360 shellparam.p = argv + 1;
8361 #if ENABLE_ASH_GETOPTS
8362 shellparam.optind = 1;
8363 shellparam.optoff = -1;
8365 evaltree(&func->n, flags & EV_TESTED);
8371 localvars = savelocalvars;
8372 freeparam(&shellparam);
8373 shellparam = saveparam;
8374 exception_handler = savehandler;
8376 evalskip &= ~SKIPFUNC;
8380 #if ENABLE_ASH_CMDCMD
8382 parse_command_args(char **argv, const char **path)
8395 if (c == '-' && !*cp) {
8402 *path = bb_default_path;
8405 /* run 'typecmd' for other options */
8416 * Make a variable a local variable. When a variable is made local, it's
8417 * value and flags are saved in a localvar structure. The saved values
8418 * will be restored when the shell function returns. We handle the name
8419 * "-" as a special case.
8424 struct localvar *lvp;
8429 lvp = ckzalloc(sizeof(struct localvar));
8430 if (LONE_DASH(name)) {
8432 p = ckmalloc(sizeof(optlist));
8433 lvp->text = memcpy(p, optlist, sizeof(optlist));
8438 vpp = hashvar(name);
8439 vp = *findvar(vpp, name);
8440 eq = strchr(name, '=');
8443 setvareq(name, VSTRFIXED);
8445 setvar(name, NULL, VSTRFIXED);
8446 vp = *vpp; /* the new variable */
8447 lvp->flags = VUNSET;
8449 lvp->text = vp->text;
8450 lvp->flags = vp->flags;
8451 vp->flags |= VSTRFIXED|VTEXTFIXED;
8457 lvp->next = localvars;
8463 * The "local" command.
8466 localcmd(int argc UNUSED_PARAM, char **argv)
8471 while ((name = *argv++) != NULL) {
8478 falsecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
8484 truecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
8490 execcmd(int argc UNUSED_PARAM, char **argv)
8493 iflag = 0; /* exit on error */
8496 shellexec(argv + 1, pathval(), 0);
8502 * The return command.
8505 returncmd(int argc UNUSED_PARAM, char **argv)
8508 * If called outside a function, do what ksh does;
8509 * skip the rest of the file.
8511 evalskip = funcnest ? SKIPFUNC : SKIPFILE;
8512 return argv[1] ? number(argv[1]) : exitstatus;
8515 /* Forward declarations for builtintab[] */
8516 static int breakcmd(int, char **);
8517 static int dotcmd(int, char **);
8518 static int evalcmd(int, char **);
8519 static int exitcmd(int, char **);
8520 static int exportcmd(int, char **);
8521 #if ENABLE_ASH_GETOPTS
8522 static int getoptscmd(int, char **);
8524 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
8525 static int helpcmd(int, char **);
8527 #if ENABLE_ASH_MATH_SUPPORT
8528 static int letcmd(int, char **);
8530 static int readcmd(int, char **);
8531 static int setcmd(int, char **);
8532 static int shiftcmd(int, char **);
8533 static int timescmd(int, char **);
8534 static int trapcmd(int, char **);
8535 static int umaskcmd(int, char **);
8536 static int unsetcmd(int, char **);
8537 static int ulimitcmd(int, char **);
8539 #define BUILTIN_NOSPEC "0"
8540 #define BUILTIN_SPECIAL "1"
8541 #define BUILTIN_REGULAR "2"
8542 #define BUILTIN_SPEC_REG "3"
8543 #define BUILTIN_ASSIGN "4"
8544 #define BUILTIN_SPEC_ASSG "5"
8545 #define BUILTIN_REG_ASSG "6"
8546 #define BUILTIN_SPEC_REG_ASSG "7"
8548 /* We do not handle [[ expr ]] bashism bash-compatibly,
8549 * we make it a synonym of [ expr ].
8550 * Basically, word splitting and pathname expansion should NOT be performed
8552 * no word splitting: a="a b"; [[ $a = "a b" ]]; echo $? should print "0"
8553 * no pathname expansion: [[ /bin/m* = "/bin/m*" ]]; echo $? should print "0"
8554 * Additional operators:
8555 * || and && should work as -o and -a
8557 * Apart from the above, [[ expr ]] should work as [ expr ]
8560 #define echocmd echo_main
8561 #define printfcmd printf_main
8562 #define testcmd test_main
8564 /* Keep these in proper order since it is searched via bsearch() */
8565 static const struct builtincmd builtintab[] = {
8566 { BUILTIN_SPEC_REG ".", dotcmd },
8567 { BUILTIN_SPEC_REG ":", truecmd },
8568 #if ENABLE_ASH_BUILTIN_TEST
8569 { BUILTIN_REGULAR "[", testcmd },
8570 #if ENABLE_ASH_BASH_COMPAT
8571 { BUILTIN_REGULAR "[[", testcmd },
8574 #if ENABLE_ASH_ALIAS
8575 { BUILTIN_REG_ASSG "alias", aliascmd },
8578 { BUILTIN_REGULAR "bg", fg_bgcmd },
8580 { BUILTIN_SPEC_REG "break", breakcmd },
8581 { BUILTIN_REGULAR "cd", cdcmd },
8582 { BUILTIN_NOSPEC "chdir", cdcmd },
8583 #if ENABLE_ASH_CMDCMD
8584 { BUILTIN_REGULAR "command", commandcmd },
8586 { BUILTIN_SPEC_REG "continue", breakcmd },
8587 #if ENABLE_ASH_BUILTIN_ECHO
8588 { BUILTIN_REGULAR "echo", echocmd },
8590 { BUILTIN_SPEC_REG "eval", evalcmd },
8591 { BUILTIN_SPEC_REG "exec", execcmd },
8592 { BUILTIN_SPEC_REG "exit", exitcmd },
8593 { BUILTIN_SPEC_REG_ASSG "export", exportcmd },
8594 { BUILTIN_REGULAR "false", falsecmd },
8596 { BUILTIN_REGULAR "fg", fg_bgcmd },
8598 #if ENABLE_ASH_GETOPTS
8599 { BUILTIN_REGULAR "getopts", getoptscmd },
8601 { BUILTIN_NOSPEC "hash", hashcmd },
8602 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
8603 { BUILTIN_NOSPEC "help", helpcmd },
8606 { BUILTIN_REGULAR "jobs", jobscmd },
8607 { BUILTIN_REGULAR "kill", killcmd },
8609 #if ENABLE_ASH_MATH_SUPPORT
8610 { BUILTIN_NOSPEC "let", letcmd },
8612 { BUILTIN_ASSIGN "local", localcmd },
8613 #if ENABLE_ASH_BUILTIN_PRINTF
8614 { BUILTIN_REGULAR "printf", printfcmd },
8616 { BUILTIN_NOSPEC "pwd", pwdcmd },
8617 { BUILTIN_REGULAR "read", readcmd },
8618 { BUILTIN_SPEC_REG_ASSG "readonly", exportcmd },
8619 { BUILTIN_SPEC_REG "return", returncmd },
8620 { BUILTIN_SPEC_REG "set", setcmd },
8621 { BUILTIN_SPEC_REG "shift", shiftcmd },
8622 { BUILTIN_SPEC_REG "source", dotcmd },
8623 #if ENABLE_ASH_BUILTIN_TEST
8624 { BUILTIN_REGULAR "test", testcmd },
8626 { BUILTIN_SPEC_REG "times", timescmd },
8627 { BUILTIN_SPEC_REG "trap", trapcmd },
8628 { BUILTIN_REGULAR "true", truecmd },
8629 { BUILTIN_NOSPEC "type", typecmd },
8630 { BUILTIN_NOSPEC "ulimit", ulimitcmd },
8631 { BUILTIN_REGULAR "umask", umaskcmd },
8632 #if ENABLE_ASH_ALIAS
8633 { BUILTIN_REGULAR "unalias", unaliascmd },
8635 { BUILTIN_SPEC_REG "unset", unsetcmd },
8636 { BUILTIN_REGULAR "wait", waitcmd },
8639 /* Should match the above table! */
8640 #define COMMANDCMD (builtintab + \
8642 1 * ENABLE_ASH_BUILTIN_TEST + \
8643 1 * ENABLE_ASH_BUILTIN_TEST * ENABLE_ASH_BASH_COMPAT + \
8644 1 * ENABLE_ASH_ALIAS + \
8645 1 * ENABLE_ASH_JOB_CONTROL + \
8647 #define EXECCMD (builtintab + \
8649 1 * ENABLE_ASH_BUILTIN_TEST + \
8650 1 * ENABLE_ASH_BUILTIN_TEST * ENABLE_ASH_BASH_COMPAT + \
8651 1 * ENABLE_ASH_ALIAS + \
8652 1 * ENABLE_ASH_JOB_CONTROL + \
8654 1 * ENABLE_ASH_CMDCMD + \
8656 ENABLE_ASH_BUILTIN_ECHO + \
8660 * Search the table of builtin commands.
8662 static struct builtincmd *
8663 find_builtin(const char *name)
8665 struct builtincmd *bp;
8668 name, builtintab, ARRAY_SIZE(builtintab), sizeof(builtintab[0]),
8675 * Execute a simple command.
8678 isassignment(const char *p)
8680 const char *q = endofname(p);
8686 bltincmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
8688 /* Preserve exitstatus of a previous possible redirection
8689 * as POSIX mandates */
8690 return back_exitstatus;
8693 evalcommand(union node *cmd, int flags)
8695 static const struct builtincmd null_bltin = {
8696 "\0\0", bltincmd /* why three NULs? */
8698 struct stackmark smark;
8700 struct arglist arglist;
8701 struct arglist varlist;
8704 const struct strlist *sp;
8705 struct cmdentry cmdentry;
8713 struct builtincmd *bcmd;
8714 int pseudovarflag = 0;
8716 /* First expand the arguments. */
8717 TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags));
8718 setstackmark(&smark);
8719 back_exitstatus = 0;
8721 cmdentry.cmdtype = CMDBUILTIN;
8722 cmdentry.u.cmd = &null_bltin;
8723 varlist.lastp = &varlist.list;
8724 *varlist.lastp = NULL;
8725 arglist.lastp = &arglist.list;
8726 *arglist.lastp = NULL;
8729 if (cmd->ncmd.args) {
8730 bcmd = find_builtin(cmd->ncmd.args->narg.text);
8731 pseudovarflag = bcmd && IS_BUILTIN_ASSIGN(bcmd);
8734 for (argp = cmd->ncmd.args; argp; argp = argp->narg.next) {
8735 struct strlist **spp;
8737 spp = arglist.lastp;
8738 if (pseudovarflag && isassignment(argp->narg.text))
8739 expandarg(argp, &arglist, EXP_VARTILDE);
8741 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
8743 for (sp = *spp; sp; sp = sp->next)
8747 argv = nargv = stalloc(sizeof(char *) * (argc + 1));
8748 for (sp = arglist.list; sp; sp = sp->next) {
8749 TRACE(("evalcommand arg: %s\n", sp->text));
8750 *nargv++ = sp->text;
8755 if (iflag && funcnest == 0 && argc > 0)
8756 lastarg = nargv[-1];
8759 expredir(cmd->ncmd.redirect);
8760 status = redirectsafe(cmd->ncmd.redirect, REDIR_PUSH | REDIR_SAVEFD2);
8763 for (argp = cmd->ncmd.assign; argp; argp = argp->narg.next) {
8764 struct strlist **spp;
8767 spp = varlist.lastp;
8768 expandarg(argp, &varlist, EXP_VARTILDE);
8771 * Modify the command lookup path, if a PATH= assignment
8775 if (varequal(p, path))
8779 /* Print the command if xflag is set. */
8782 const char *p = " %s";
8785 fdprintf(preverrout_fd, p, expandstr(ps4val()));
8788 for (n = 0; n < 2; n++) {
8790 fdprintf(preverrout_fd, p, sp->text);
8798 safe_write(preverrout_fd, "\n", 1);
8804 /* Now locate the command. */
8806 const char *oldpath;
8807 int cmd_flag = DO_ERR;
8812 find_command(argv[0], &cmdentry, cmd_flag, path);
8813 if (cmdentry.cmdtype == CMDUNKNOWN) {
8819 /* implement bltin and command here */
8820 if (cmdentry.cmdtype != CMDBUILTIN)
8823 spclbltin = IS_BUILTIN_SPECIAL(cmdentry.u.cmd);
8824 if (cmdentry.u.cmd == EXECCMD)
8826 #if ENABLE_ASH_CMDCMD
8827 if (cmdentry.u.cmd == COMMANDCMD) {
8829 nargv = parse_command_args(argv, &path);
8832 argc -= nargv - argv;
8834 cmd_flag |= DO_NOFUNC;
8842 /* We have a redirection error. */
8844 raise_exception(EXERROR);
8846 exitstatus = status;
8850 /* Execute the command. */
8851 switch (cmdentry.cmdtype) {
8853 #if ENABLE_FEATURE_SH_NOFORK
8855 /* find_command() encodes applet_no as (-2 - applet_no) */
8856 int applet_no = (- cmdentry.u.index - 2);
8857 if (applet_no >= 0 && APPLET_IS_NOFORK(applet_no)) {
8858 listsetvar(varlist.list, VEXPORT|VSTACK);
8859 /* run <applet>_main() */
8860 exitstatus = run_nofork_applet(applet_no, argv);
8866 /* Fork off a child process if necessary. */
8867 if (!(flags & EV_EXIT) || trap[0]) {
8869 jp = makejob(/*cmd,*/ 1);
8870 if (forkshell(jp, cmd, FORK_FG) != 0) {
8871 exitstatus = waitforjob(jp);
8877 listsetvar(varlist.list, VEXPORT|VSTACK);
8878 shellexec(argv, path, cmdentry.u.index);
8882 cmdenviron = varlist.list;
8884 struct strlist *list = cmdenviron;
8886 if (spclbltin > 0 || argc == 0) {
8888 if (cmd_is_exec && argc > 1)
8891 listsetvar(list, i);
8893 if (evalbltin(cmdentry.u.cmd, argc, argv)) {
8900 exit_status = 128 + SIGINT;
8902 exit_status = 128 + pendingsig;
8903 exitstatus = exit_status;
8904 if (i == EXINT || spclbltin > 0) {
8906 longjmp(exception_handler->loc, 1);
8913 listsetvar(varlist.list, 0);
8914 if (evalfun(cmdentry.u.func, argc, argv, flags))
8920 popredir(cmd_is_exec);
8922 /* dsl: I think this is intended to be used to support
8923 * '_' in 'vi' command mode during line editing...
8924 * However I implemented that within libedit itself.
8926 setvar("_", lastarg, 0);
8928 popstackmark(&smark);
8932 evalbltin(const struct builtincmd *cmd, int argc, char **argv)
8934 char *volatile savecmdname;
8935 struct jmploc *volatile savehandler;
8936 struct jmploc jmploc;
8939 savecmdname = commandname;
8940 i = setjmp(jmploc.loc);
8943 savehandler = exception_handler;
8944 exception_handler = &jmploc;
8945 commandname = argv[0];
8947 optptr = NULL; /* initialize nextopt */
8948 exitstatus = (*cmd->builtin)(argc, argv);
8949 flush_stdout_stderr();
8951 exitstatus |= ferror(stdout);
8953 commandname = savecmdname;
8955 exception_handler = savehandler;
8961 goodname(const char *p)
8963 return !*endofname(p);
8968 * Search for a command. This is called before we fork so that the
8969 * location of the command will be available in the parent as well as
8970 * the child. The check for "goodname" is an overly conservative
8971 * check that the name will not be subject to expansion.
8974 prehash(union node *n)
8976 struct cmdentry entry;
8978 if (n->type == NCMD && n->ncmd.args && goodname(n->ncmd.args->narg.text))
8979 find_command(n->ncmd.args->narg.text, &entry, 0, pathval());
8983 /* ============ Builtin commands
8985 * Builtin commands whose functions are closely tied to evaluation
8986 * are implemented here.
8990 * Handle break and continue commands. Break, continue, and return are
8991 * all handled by setting the evalskip flag. The evaluation routines
8992 * above all check this flag, and if it is set they start skipping
8993 * commands rather than executing them. The variable skipcount is
8994 * the number of loops to break/continue, or the number of function
8995 * levels to return. (The latter is always 1.) It should probably
8996 * be an error to break out of more loops than exist, but it isn't
8997 * in the standard shell so we don't make it one here.
9000 breakcmd(int argc UNUSED_PARAM, char **argv)
9002 int n = argv[1] ? number(argv[1]) : 1;
9005 ash_msg_and_raise_error(illnum, argv[1]);
9009 evalskip = (**argv == 'c') ? SKIPCONT : SKIPBREAK;
9016 /* ============ input.c
9018 * This implements the input routines used by the parser.
9021 #define EOF_NLEFT -99 /* value of parsenleft when EOF pushed back */
9024 INPUT_PUSH_FILE = 1,
9025 INPUT_NOFILE_OK = 2,
9028 static int plinno = 1; /* input line number */
9029 /* number of characters left in input buffer */
9030 static int parsenleft; /* copy of parsefile->nleft */
9031 static int parselleft; /* copy of parsefile->lleft */
9032 /* next character in input buffer */
9033 static char *parsenextc; /* copy of parsefile->nextc */
9035 static smallint checkkwd;
9036 /* values of checkkwd variable */
9037 #define CHKALIAS 0x1
9044 struct strpush *sp = g_parsefile->strpush;
9047 #if ENABLE_ASH_ALIAS
9049 if (parsenextc[-1] == ' ' || parsenextc[-1] == '\t') {
9050 checkkwd |= CHKALIAS;
9052 if (sp->string != sp->ap->val) {
9055 sp->ap->flag &= ~ALIASINUSE;
9056 if (sp->ap->flag & ALIASDEAD) {
9057 unalias(sp->ap->name);
9061 parsenextc = sp->prevstring;
9062 parsenleft = sp->prevnleft;
9063 /*dprintf("*** calling popstring: restoring to '%s'\n", parsenextc);*/
9064 g_parsefile->strpush = sp->prev;
9065 if (sp != &(g_parsefile->basestrpush))
9074 char *buf = g_parsefile->buf;
9077 #if ENABLE_FEATURE_EDITING
9079 if (!iflag || g_parsefile->fd)
9080 nr = nonblock_safe_read(g_parsefile->fd, buf, BUFSIZ - 1);
9082 #if ENABLE_FEATURE_TAB_COMPLETION
9083 line_input_state->path_lookup = pathval();
9085 nr = read_line_input(cmdedit_prompt, buf, BUFSIZ, line_input_state);
9087 /* Ctrl+C pressed */
9096 if (nr < 0 && errno == 0) {
9097 /* Ctrl+D pressed */
9102 nr = nonblock_safe_read(g_parsefile->fd, buf, BUFSIZ - 1);
9106 /* nonblock_safe_read() handles this problem */
9108 if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
9109 int flags = fcntl(0, F_GETFL);
9110 if (flags >= 0 && (flags & O_NONBLOCK)) {
9111 flags &= ~O_NONBLOCK;
9112 if (fcntl(0, F_SETFL, flags) >= 0) {
9113 out2str("sh: turning off NDELAY mode\n");
9124 * Refill the input buffer and return the next input character:
9126 * 1) If a string was pushed back on the input, pop it;
9127 * 2) If an EOF was pushed back (parsenleft == EOF_NLEFT) or we are reading
9128 * from a string so we can't refill the buffer, return EOF.
9129 * 3) If the is more stuff in this buffer, use it else call read to fill it.
9130 * 4) Process input up to the next newline, deleting nul characters.
9139 while (g_parsefile->strpush) {
9140 #if ENABLE_ASH_ALIAS
9141 if (parsenleft == -1 && g_parsefile->strpush->ap &&
9142 parsenextc[-1] != ' ' && parsenextc[-1] != '\t') {
9147 if (--parsenleft >= 0)
9148 return signed_char2int(*parsenextc++);
9150 if (parsenleft == EOF_NLEFT || g_parsefile->buf == NULL)
9152 flush_stdout_stderr();
9159 parselleft = parsenleft = EOF_NLEFT;
9166 /* delete nul characters */
9174 memmove(q, q + 1, more);
9178 parsenleft = q - parsenextc - 1;
9184 parsenleft = q - parsenextc - 1;
9196 out2str(parsenextc);
9201 return signed_char2int(*parsenextc++);
9204 #define pgetc_as_macro() (--parsenleft >= 0? signed_char2int(*parsenextc++) : preadbuffer())
9208 return pgetc_as_macro();
9211 #if ENABLE_ASH_OPTIMIZE_FOR_SIZE
9212 #define pgetc_macro() pgetc()
9214 #define pgetc_macro() pgetc_as_macro()
9218 * Same as pgetc(), but ignores PEOA.
9220 #if ENABLE_ASH_ALIAS
9228 } while (c == PEOA);
9235 return pgetc_macro();
9240 * Read a line from the script.
9243 pfgets(char *line, int len)
9249 while (--nleft > 0) {
9265 * Undo the last call to pgetc. Only one character may be pushed back.
9266 * PEOF may be pushed back.
9276 * Push a string back onto the input at this current parsefile level.
9277 * We handle aliases this way.
9279 #if !ENABLE_ASH_ALIAS
9280 #define pushstring(s, ap) pushstring(s)
9283 pushstring(char *s, struct alias *ap)
9290 /*dprintf("*** calling pushstring: %s, %d\n", s, len);*/
9291 if (g_parsefile->strpush) {
9292 sp = ckzalloc(sizeof(struct strpush));
9293 sp->prev = g_parsefile->strpush;
9294 g_parsefile->strpush = sp;
9296 sp = g_parsefile->strpush = &(g_parsefile->basestrpush);
9297 sp->prevstring = parsenextc;
9298 sp->prevnleft = parsenleft;
9299 #if ENABLE_ASH_ALIAS
9302 ap->flag |= ALIASINUSE;
9312 * To handle the "." command, a stack of input files is used. Pushfile
9313 * adds a new entry to the stack and popfile restores the previous level.
9318 struct parsefile *pf;
9320 g_parsefile->nleft = parsenleft;
9321 g_parsefile->lleft = parselleft;
9322 g_parsefile->nextc = parsenextc;
9323 g_parsefile->linno = plinno;
9324 pf = ckzalloc(sizeof(*pf));
9325 pf->prev = g_parsefile;
9327 /*pf->strpush = NULL; - ckzalloc did it */
9328 /*pf->basestrpush.prev = NULL;*/
9335 struct parsefile *pf = g_parsefile;
9343 g_parsefile = pf->prev;
9345 parsenleft = g_parsefile->nleft;
9346 parselleft = g_parsefile->lleft;
9347 parsenextc = g_parsefile->nextc;
9348 plinno = g_parsefile->linno;
9353 * Return to top level.
9358 while (g_parsefile != &basepf)
9363 * Close the file(s) that the shell is reading commands from. Called
9364 * after a fork is done.
9370 if (g_parsefile->fd > 0) {
9371 close(g_parsefile->fd);
9372 g_parsefile->fd = 0;
9377 * Like setinputfile, but takes an open file descriptor. Call this with
9381 setinputfd(int fd, int push)
9383 close_on_exec_on(fd);
9386 g_parsefile->buf = 0;
9388 g_parsefile->fd = fd;
9389 if (g_parsefile->buf == NULL)
9390 g_parsefile->buf = ckmalloc(IBUFSIZ);
9391 parselleft = parsenleft = 0;
9396 * Set the input to take input from a file. If push is set, push the
9397 * old input onto the stack first.
9400 setinputfile(const char *fname, int flags)
9406 fd = open(fname, O_RDONLY);
9408 if (flags & INPUT_NOFILE_OK)
9410 ash_msg_and_raise_error("can't open %s", fname);
9413 fd2 = copyfd(fd, 10);
9416 ash_msg_and_raise_error("out of file descriptors");
9419 setinputfd(fd, flags & INPUT_PUSH_FILE);
9426 * Like setinputfile, but takes input from a string.
9429 setinputstring(char *string)
9433 parsenextc = string;
9434 parsenleft = strlen(string);
9435 g_parsefile->buf = NULL;
9441 /* ============ mail.c
9443 * Routines to check for mail.
9448 #define MAXMBOXES 10
9450 /* times of mailboxes */
9451 static time_t mailtime[MAXMBOXES];
9452 /* Set if MAIL or MAILPATH is changed. */
9453 static smallint mail_var_path_changed;
9456 * Print appropriate message(s) if mail has arrived.
9457 * If mail_var_path_changed is set,
9458 * then the value of MAIL has mail_var_path_changed,
9459 * so we just update the values.
9468 struct stackmark smark;
9471 setstackmark(&smark);
9472 mpath = mpathset() ? mpathval() : mailval();
9473 for (mtp = mailtime; mtp < mailtime + MAXMBOXES; mtp++) {
9474 p = padvance(&mpath, nullstr);
9479 for (q = p; *q; q++)
9485 q[-1] = '\0'; /* delete trailing '/' */
9486 if (stat(p, &statb) < 0) {
9490 if (!mail_var_path_changed && statb.st_mtime != *mtp) {
9493 pathopt ? pathopt : "you have mail"
9496 *mtp = statb.st_mtime;
9498 mail_var_path_changed = 0;
9499 popstackmark(&smark);
9503 changemail(const char *val UNUSED_PARAM)
9505 mail_var_path_changed = 1;
9508 #endif /* ASH_MAIL */
9511 /* ============ ??? */
9514 * Set the shell parameters.
9517 setparam(char **argv)
9523 for (nparam = 0; argv[nparam]; nparam++)
9525 ap = newparam = ckmalloc((nparam + 1) * sizeof(*ap));
9527 *ap++ = ckstrdup(*argv++);
9530 freeparam(&shellparam);
9531 shellparam.malloced = 1;
9532 shellparam.nparam = nparam;
9533 shellparam.p = newparam;
9534 #if ENABLE_ASH_GETOPTS
9535 shellparam.optind = 1;
9536 shellparam.optoff = -1;
9541 * Process shell options. The global variable argptr contains a pointer
9542 * to the argument list; we advance it past the options.
9544 * SUSv3 section 2.8.1 "Consequences of Shell Errors" says:
9545 * For a non-interactive shell, an error condition encountered
9546 * by a special built-in ... shall cause the shell to write a diagnostic message
9547 * to standard error and exit as shown in the following table:
9548 * Error Special Built-In
9550 * Utility syntax error (option or operand error) Shall exit
9552 * However, in bug 1142 (http://busybox.net/bugs/view.php?id=1142)
9553 * we see that bash does not do that (set "finishes" with error code 1 instead,
9554 * and shell continues), and people rely on this behavior!
9556 * set -o barfoo 2>/dev/null
9559 * Oh well. Let's mimic that.
9562 plus_minus_o(char *name, int val)
9567 for (i = 0; i < NOPTS; i++) {
9568 if (strcmp(name, optnames(i)) == 0) {
9573 ash_msg("illegal option %co %s", val ? '-' : '+', name);
9576 for (i = 0; i < NOPTS; i++) {
9578 out1fmt("%-16s%s\n", optnames(i), optlist[i] ? "on" : "off");
9580 out1fmt("set %co %s\n", optlist[i] ? '-' : '+', optnames(i));
9586 setoption(int flag, int val)
9590 for (i = 0; i < NOPTS; i++) {
9591 if (optletters(i) == flag) {
9596 ash_msg_and_raise_error("illegal option %c%c", val ? '-' : '+', flag);
9600 options(int cmdline)
9608 while ((p = *argptr) != NULL) {
9610 if (c != '-' && c != '+')
9613 val = 0; /* val = 0 if c == '+' */
9616 if (p[0] == '\0' || LONE_DASH(p)) {
9618 /* "-" means turn off -x and -v */
9621 /* "--" means reset params */
9622 else if (*argptr == NULL)
9625 break; /* "-" or "--" terminates options */
9628 /* first char was + or - */
9629 while ((c = *p++) != '\0') {
9630 /* bash 3.2 indeed handles -c CMD and +c CMD the same */
9631 if (c == 'c' && cmdline) {
9632 minusc = p; /* command is after shell args */
9633 } else if (c == 'o') {
9634 if (plus_minus_o(*argptr, val)) {
9635 /* it already printed err message */
9636 return 1; /* error */
9640 } else if (cmdline && (c == 'l')) { /* -l or +l == --login */
9642 /* bash does not accept +-login, we also won't */
9643 } else if (cmdline && val && (c == '-')) { /* long options */
9644 if (strcmp(p, "login") == 0)
9656 * The shift builtin command.
9659 shiftcmd(int argc UNUSED_PARAM, char **argv)
9666 n = number(argv[1]);
9667 if (n > shellparam.nparam)
9668 n = 0; /* bash compat, was = shellparam.nparam; */
9670 shellparam.nparam -= n;
9671 for (ap1 = shellparam.p; --n >= 0; ap1++) {
9672 if (shellparam.malloced)
9676 while ((*ap2++ = *ap1++) != NULL)
9678 #if ENABLE_ASH_GETOPTS
9679 shellparam.optind = 1;
9680 shellparam.optoff = -1;
9687 * POSIX requires that 'set' (but not export or readonly) output the
9688 * variables in lexicographic order - by the locale's collating order (sigh).
9689 * Maybe we could keep them in an ordered balanced binary tree
9690 * instead of hashed lists.
9691 * For now just roll 'em through qsort for printing...
9694 showvars(const char *sep_prefix, int on, int off)
9699 ep = listvars(on, off, &epend);
9700 qsort(ep, epend - ep, sizeof(char *), vpcmp);
9702 sep = *sep_prefix ? " " : sep_prefix;
9704 for (; ep < epend; ep++) {
9708 p = strchrnul(*ep, '=');
9711 q = single_quote(++p);
9712 out1fmt("%s%s%.*s%s\n", sep_prefix, sep, (int)(p - *ep), *ep, q);
9718 * The set command builtin.
9721 setcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
9726 return showvars(nullstr, 0, VUNSET);
9729 if (!options(0)) { /* if no parse error... */
9732 if (*argptr != NULL) {
9740 #if ENABLE_ASH_RANDOM_SUPPORT
9742 change_random(const char *value)
9744 /* Galois LFSR parameter */
9745 /* Taps at 32 31 29 1: */
9746 enum { MASK = 0x8000000b };
9747 /* Another example - taps at 32 31 30 10: */
9748 /* MASK = 0x00400007 */
9750 if (value == NULL) {
9751 /* "get", generate */
9754 /* LCG has period of 2^32 and alternating lowest bit */
9755 random_LCG = 1664525 * random_LCG + 1013904223;
9756 /* Galois LFSR has period of 2^32-1 = 3 * 5 * 17 * 257 * 65537 */
9757 t = (random_galois_LFSR << 1);
9758 if (random_galois_LFSR < 0) /* if we just shifted 1 out of msb... */
9760 random_galois_LFSR = t;
9761 /* Both are weak, combining them gives better randomness
9762 * and ~2^64 period. & 0x7fff is probably bash compat
9763 * for $RANDOM range. Combining with subtraction is
9764 * just for fun. + and ^ would work equally well. */
9765 t = (t - random_LCG) & 0x7fff;
9766 /* set without recursion */
9767 setvar(vrandom.text, utoa(t), VNOFUNC);
9768 vrandom.flags &= ~VNOFUNC;
9771 random_galois_LFSR = random_LCG = strtoul(value, (char **)NULL, 10);
9776 #if ENABLE_ASH_GETOPTS
9778 getopts(char *optstr, char *optvar, char **optfirst, int *param_optind, int *optoff)
9787 if (*param_optind < 1)
9789 optnext = optfirst + *param_optind - 1;
9791 if (*param_optind <= 1 || *optoff < 0 || (int)strlen(optnext[-1]) < *optoff)
9794 p = optnext[-1] + *optoff;
9795 if (p == NULL || *p == '\0') {
9796 /* Current word is done, advance */
9798 if (p == NULL || *p != '-' || *++p == '\0') {
9805 if (LONE_DASH(p)) /* check for "--" */
9810 for (q = optstr; *q != c;) {
9812 if (optstr[0] == ':') {
9815 err |= setvarsafe("OPTARG", s, 0);
9817 fprintf(stderr, "Illegal option -%c\n", c);
9828 if (*p == '\0' && (p = *optnext) == NULL) {
9829 if (optstr[0] == ':') {
9832 err |= setvarsafe("OPTARG", s, 0);
9835 fprintf(stderr, "No arg for -%c option\n", c);
9844 err |= setvarsafe("OPTARG", p, 0);
9847 err |= setvarsafe("OPTARG", nullstr, 0);
9849 *optoff = p ? p - *(optnext - 1) : -1;
9850 *param_optind = optnext - optfirst + 1;
9851 fmtstr(s, sizeof(s), "%d", *param_optind);
9852 err |= setvarsafe("OPTIND", s, VNOFUNC);
9855 err |= setvarsafe(optvar, s, 0);
9859 flush_stdout_stderr();
9860 raise_exception(EXERROR);
9866 * The getopts builtin. Shellparam.optnext points to the next argument
9867 * to be processed. Shellparam.optptr points to the next character to
9868 * be processed in the current argument. If shellparam.optnext is NULL,
9869 * then it's the first time getopts has been called.
9872 getoptscmd(int argc, char **argv)
9877 ash_msg_and_raise_error("usage: getopts optstring var [arg]");
9879 optbase = shellparam.p;
9880 if (shellparam.optind > shellparam.nparam + 1) {
9881 shellparam.optind = 1;
9882 shellparam.optoff = -1;
9886 if (shellparam.optind > argc - 2) {
9887 shellparam.optind = 1;
9888 shellparam.optoff = -1;
9892 return getopts(argv[1], argv[2], optbase, &shellparam.optind,
9893 &shellparam.optoff);
9895 #endif /* ASH_GETOPTS */
9898 /* ============ Shell parser */
9901 struct heredoc *next; /* next here document in list */
9902 union node *here; /* redirection node */
9903 char *eofmark; /* string indicating end of input */
9904 smallint striptabs; /* if set, strip leading tabs */
9907 static smallint tokpushback; /* last token pushed back */
9908 static smallint parsebackquote; /* nonzero if we are inside backquotes */
9909 static smallint quoteflag; /* set if (part of) last token was quoted */
9910 static token_id_t lasttoken; /* last token read (integer id Txxx) */
9911 static struct heredoc *heredoclist; /* list of here documents to read */
9912 static char *wordtext; /* text of last word returned by readtoken */
9913 static struct nodelist *backquotelist;
9914 static union node *redirnode;
9915 static struct heredoc *heredoc;
9917 * NEOF is returned by parsecmd when it encounters an end of file. It
9918 * must be distinct from NULL, so we use the address of a variable that
9919 * happens to be handy.
9921 #define NEOF ((union node *)&tokpushback)
9923 static void raise_error_syntax(const char *) NORETURN;
9925 raise_error_syntax(const char *msg)
9927 ash_msg_and_raise_error("syntax error: %s", msg);
9932 * Called when an unexpected token is read during the parse. The argument
9933 * is the token that is expected, or -1 if more than one type of token can
9934 * occur at this point.
9936 static void raise_error_unexpected_syntax(int) NORETURN;
9938 raise_error_unexpected_syntax(int token)
9943 l = sprintf(msg, "%s unexpected", tokname(lasttoken));
9945 sprintf(msg + l, " (expecting %s)", tokname(token));
9946 raise_error_syntax(msg);
9950 #define EOFMARKLEN 79
9952 /* parsing is heavily cross-recursive, need these forward decls */
9953 static union node *andor(void);
9954 static union node *pipeline(void);
9955 static union node *parse_command(void);
9956 static void parseheredoc(void);
9957 static char peektoken(void);
9958 static int readtoken(void);
9963 union node *n1, *n2, *n3;
9966 checkkwd = CHKNL | CHKKWD | CHKALIAS;
9967 if (nlflag == 2 && peektoken())
9973 if (tok == TBACKGND) {
9974 if (n2->type == NPIPE) {
9975 n2->npipe.pipe_backgnd = 1;
9977 if (n2->type != NREDIR) {
9978 n3 = stzalloc(sizeof(struct nredir));
9980 /*n3->nredir.redirect = NULL; - stzalloc did it */
9983 n2->type = NBACKGND;
9989 n3 = stzalloc(sizeof(struct nbinary));
9991 n3->nbinary.ch1 = n1;
9992 n3->nbinary.ch2 = n2;
10008 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10016 pungetc(); /* push back EOF on input */
10020 raise_error_unexpected_syntax(-1);
10027 static union node *
10030 union node *n1, *n2, *n3;
10038 } else if (t == TOR) {
10044 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10046 n3 = stzalloc(sizeof(struct nbinary));
10048 n3->nbinary.ch1 = n1;
10049 n3->nbinary.ch2 = n2;
10054 static union node *
10057 union node *n1, *n2, *pipenode;
10058 struct nodelist *lp, *prev;
10062 TRACE(("pipeline: entered\n"));
10063 if (readtoken() == TNOT) {
10065 checkkwd = CHKKWD | CHKALIAS;
10068 n1 = parse_command();
10069 if (readtoken() == TPIPE) {
10070 pipenode = stzalloc(sizeof(struct npipe));
10071 pipenode->type = NPIPE;
10072 /*pipenode->npipe.pipe_backgnd = 0; - stzalloc did it */
10073 lp = stzalloc(sizeof(struct nodelist));
10074 pipenode->npipe.cmdlist = lp;
10078 lp = stzalloc(sizeof(struct nodelist));
10079 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10080 lp->n = parse_command();
10082 } while (readtoken() == TPIPE);
10088 n2 = stzalloc(sizeof(struct nnot));
10096 static union node *
10101 n = stzalloc(sizeof(struct narg));
10103 /*n->narg.next = NULL; - stzalloc did it */
10104 n->narg.text = wordtext;
10105 n->narg.backquote = backquotelist;
10110 fixredir(union node *n, const char *text, int err)
10114 TRACE(("Fix redir %s %d\n", text, err));
10116 n->ndup.vname = NULL;
10118 fd = bb_strtou(text, NULL, 10);
10119 if (!errno && fd >= 0)
10120 n->ndup.dupfd = fd;
10121 else if (LONE_DASH(text))
10122 n->ndup.dupfd = -1;
10125 raise_error_syntax("Bad fd number");
10126 n->ndup.vname = makename();
10131 * Returns true if the text contains nothing to expand (no dollar signs
10135 noexpand(char *text)
10141 while ((c = *p++) != '\0') {
10142 if (c == CTLQUOTEMARK)
10146 else if (SIT(c, BASESYNTAX) == CCTL)
10155 union node *n = redirnode;
10157 if (readtoken() != TWORD)
10158 raise_error_unexpected_syntax(-1);
10159 if (n->type == NHERE) {
10160 struct heredoc *here = heredoc;
10164 if (quoteflag == 0)
10166 TRACE(("Here document %d\n", n->type));
10167 if (!noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN)
10168 raise_error_syntax("Illegal eof marker for << redirection");
10169 rmescapes(wordtext);
10170 here->eofmark = wordtext;
10172 if (heredoclist == NULL)
10173 heredoclist = here;
10175 for (p = heredoclist; p->next; p = p->next)
10179 } else if (n->type == NTOFD || n->type == NFROMFD) {
10180 fixredir(n, wordtext, 0);
10182 n->nfile.fname = makename();
10186 static union node *
10189 union node *args, **app;
10190 union node *n = NULL;
10191 union node *vars, **vpp;
10192 union node **rpp, *redir;
10194 #if ENABLE_ASH_BASH_COMPAT
10195 smallint double_brackets_flag = 0;
10205 savecheckkwd = CHKALIAS;
10208 checkkwd = savecheckkwd;
10211 #if ENABLE_ASH_BASH_COMPAT
10212 case TAND: /* "&&" */
10213 case TOR: /* "||" */
10214 if (!double_brackets_flag) {
10218 wordtext = (char *) (t == TAND ? "-a" : "-o");
10221 n = stzalloc(sizeof(struct narg));
10223 /*n->narg.next = NULL; - stzalloc did it */
10224 n->narg.text = wordtext;
10225 #if ENABLE_ASH_BASH_COMPAT
10226 if (strcmp("[[", wordtext) == 0)
10227 double_brackets_flag = 1;
10228 else if (strcmp("]]", wordtext) == 0)
10229 double_brackets_flag = 0;
10231 n->narg.backquote = backquotelist;
10232 if (savecheckkwd && isassignment(wordtext)) {
10234 vpp = &n->narg.next;
10237 app = &n->narg.next;
10242 *rpp = n = redirnode;
10243 rpp = &n->nfile.next;
10244 parsefname(); /* read name of redirection file */
10247 if (args && app == &args->narg.next
10250 struct builtincmd *bcmd;
10253 /* We have a function */
10254 if (readtoken() != TRP)
10255 raise_error_unexpected_syntax(TRP);
10256 name = n->narg.text;
10257 if (!goodname(name)
10258 || ((bcmd = find_builtin(name)) && IS_BUILTIN_SPECIAL(bcmd))
10260 raise_error_syntax("Bad function name");
10263 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10264 n->narg.next = parse_command();
10277 n = stzalloc(sizeof(struct ncmd));
10279 n->ncmd.args = args;
10280 n->ncmd.assign = vars;
10281 n->ncmd.redirect = redir;
10285 static union node *
10286 parse_command(void)
10288 union node *n1, *n2;
10289 union node *ap, **app;
10290 union node *cp, **cpp;
10291 union node *redir, **rpp;
10298 switch (readtoken()) {
10300 raise_error_unexpected_syntax(-1);
10303 n1 = stzalloc(sizeof(struct nif));
10305 n1->nif.test = list(0);
10306 if (readtoken() != TTHEN)
10307 raise_error_unexpected_syntax(TTHEN);
10308 n1->nif.ifpart = list(0);
10310 while (readtoken() == TELIF) {
10311 n2->nif.elsepart = stzalloc(sizeof(struct nif));
10312 n2 = n2->nif.elsepart;
10314 n2->nif.test = list(0);
10315 if (readtoken() != TTHEN)
10316 raise_error_unexpected_syntax(TTHEN);
10317 n2->nif.ifpart = list(0);
10319 if (lasttoken == TELSE)
10320 n2->nif.elsepart = list(0);
10322 n2->nif.elsepart = NULL;
10330 n1 = stzalloc(sizeof(struct nbinary));
10331 n1->type = (lasttoken == TWHILE) ? NWHILE : NUNTIL;
10332 n1->nbinary.ch1 = list(0);
10335 TRACE(("expecting DO got %s %s\n", tokname(got),
10336 got == TWORD ? wordtext : ""));
10337 raise_error_unexpected_syntax(TDO);
10339 n1->nbinary.ch2 = list(0);
10344 if (readtoken() != TWORD || quoteflag || !goodname(wordtext))
10345 raise_error_syntax("Bad for loop variable");
10346 n1 = stzalloc(sizeof(struct nfor));
10348 n1->nfor.var = wordtext;
10349 checkkwd = CHKKWD | CHKALIAS;
10350 if (readtoken() == TIN) {
10352 while (readtoken() == TWORD) {
10353 n2 = stzalloc(sizeof(struct narg));
10355 /*n2->narg.next = NULL; - stzalloc did it */
10356 n2->narg.text = wordtext;
10357 n2->narg.backquote = backquotelist;
10359 app = &n2->narg.next;
10362 n1->nfor.args = ap;
10363 if (lasttoken != TNL && lasttoken != TSEMI)
10364 raise_error_unexpected_syntax(-1);
10366 n2 = stzalloc(sizeof(struct narg));
10368 /*n2->narg.next = NULL; - stzalloc did it */
10369 n2->narg.text = (char *)dolatstr;
10370 /*n2->narg.backquote = NULL;*/
10371 n1->nfor.args = n2;
10373 * Newline or semicolon here is optional (but note
10374 * that the original Bourne shell only allowed NL).
10376 if (lasttoken != TNL && lasttoken != TSEMI)
10379 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10380 if (readtoken() != TDO)
10381 raise_error_unexpected_syntax(TDO);
10382 n1->nfor.body = list(0);
10386 n1 = stzalloc(sizeof(struct ncase));
10388 if (readtoken() != TWORD)
10389 raise_error_unexpected_syntax(TWORD);
10390 n1->ncase.expr = n2 = stzalloc(sizeof(struct narg));
10392 /*n2->narg.next = NULL; - stzalloc did it */
10393 n2->narg.text = wordtext;
10394 n2->narg.backquote = backquotelist;
10396 checkkwd = CHKKWD | CHKALIAS;
10397 } while (readtoken() == TNL);
10398 if (lasttoken != TIN)
10399 raise_error_unexpected_syntax(TIN);
10400 cpp = &n1->ncase.cases;
10402 checkkwd = CHKNL | CHKKWD;
10404 while (t != TESAC) {
10405 if (lasttoken == TLP)
10407 *cpp = cp = stzalloc(sizeof(struct nclist));
10409 app = &cp->nclist.pattern;
10411 *app = ap = stzalloc(sizeof(struct narg));
10413 /*ap->narg.next = NULL; - stzalloc did it */
10414 ap->narg.text = wordtext;
10415 ap->narg.backquote = backquotelist;
10416 if (readtoken() != TPIPE)
10418 app = &ap->narg.next;
10421 //ap->narg.next = NULL;
10422 if (lasttoken != TRP)
10423 raise_error_unexpected_syntax(TRP);
10424 cp->nclist.body = list(2);
10426 cpp = &cp->nclist.next;
10428 checkkwd = CHKNL | CHKKWD;
10432 raise_error_unexpected_syntax(TENDCASE);
10439 n1 = stzalloc(sizeof(struct nredir));
10440 n1->type = NSUBSHELL;
10441 n1->nredir.n = list(0);
10442 /*n1->nredir.redirect = NULL; - stzalloc did it */
10452 return simplecmd();
10455 if (readtoken() != t)
10456 raise_error_unexpected_syntax(t);
10459 /* Now check for redirection which may follow command */
10460 checkkwd = CHKKWD | CHKALIAS;
10462 while (readtoken() == TREDIR) {
10463 *rpp = n2 = redirnode;
10464 rpp = &n2->nfile.next;
10470 if (n1->type != NSUBSHELL) {
10471 n2 = stzalloc(sizeof(struct nredir));
10476 n1->nredir.redirect = redir;
10481 #if ENABLE_ASH_BASH_COMPAT
10482 static int decode_dollar_squote(void)
10484 static const char C_escapes[] ALIGN1 = "nrbtfav""x\\01234567";
10490 p = strchr(C_escapes, c);
10495 if ((unsigned char)(c - '0') <= 7) { /* \ooo */
10499 } while ((unsigned char)(c - '0') <= 7 && --cnt);
10501 } else if (c == 'x') { /* \xHH */
10505 } while (isxdigit(c) && --cnt);
10507 if (cnt == 3) { /* \x but next char is "bad" */
10511 } else { /* simple seq like \\ or \t */
10516 c = bb_process_escape_sequence((void*)&p);
10517 } else { /* unrecognized "\z": print both chars unless ' or " */
10518 if (c != '\'' && c != '"') {
10520 c |= 0x100; /* "please encode \, then me" */
10528 * If eofmark is NULL, read a word or a redirection symbol. If eofmark
10529 * is not NULL, read a here document. In the latter case, eofmark is the
10530 * word which marks the end of the document and striptabs is true if
10531 * leading tabs should be stripped from the document. The argument firstc
10532 * is the first character of the input token or document.
10534 * Because C does not have internal subroutines, I have simulated them
10535 * using goto's to implement the subroutine linkage. The following macros
10536 * will run code that appears at the end of readtoken1.
10538 #define CHECKEND() {goto checkend; checkend_return:;}
10539 #define PARSEREDIR() {goto parseredir; parseredir_return:;}
10540 #define PARSESUB() {goto parsesub; parsesub_return:;}
10541 #define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;}
10542 #define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;}
10543 #define PARSEARITH() {goto parsearith; parsearith_return:;}
10545 readtoken1(int firstc, int syntax, char *eofmark, int striptabs)
10547 /* NB: syntax parameter fits into smallint */
10551 char line[EOFMARKLEN + 1];
10552 struct nodelist *bqlist;
10556 smallint prevsyntax; /* syntax before arithmetic */
10557 #if ENABLE_ASH_EXPAND_PRMT
10558 smallint pssyntax; /* we are expanding a prompt string */
10560 int varnest; /* levels of variables expansion */
10561 int arinest; /* levels of arithmetic expansion */
10562 int parenlevel; /* levels of parens in arithmetic */
10563 int dqvarnest; /* levels of variables expansion within double quotes */
10565 USE_ASH_BASH_COMPAT(smallint bash_dollar_squote = 0;)
10568 /* Avoid longjmp clobbering */
10574 (void) &parenlevel;
10577 (void) &prevsyntax;
10580 startlinno = plinno;
10585 #if ENABLE_ASH_EXPAND_PRMT
10586 pssyntax = (syntax == PSSYNTAX);
10590 dblquote = (syntax == DQSYNTAX);
10596 STARTSTACKSTR(out);
10597 loop: { /* for each line, until end of word */
10598 CHECKEND(); /* set c to PEOF if at end of here document */
10599 for (;;) { /* until end of line or end of word */
10600 CHECKSTRSPACE(4, out); /* permit 4 calls to USTPUTC */
10601 switch (SIT(c, syntax)) {
10602 case CNL: /* '\n' */
10603 if (syntax == BASESYNTAX)
10604 goto endword; /* exit outer loop */
10610 goto loop; /* continue outer loop */
10615 if (eofmark == NULL || dblquote)
10616 USTPUTC(CTLESC, out);
10617 #if ENABLE_ASH_BASH_COMPAT
10618 if (c == '\\' && bash_dollar_squote) {
10619 c = decode_dollar_squote();
10621 USTPUTC('\\', out);
10622 c = (unsigned char)c;
10628 case CBACK: /* backslash */
10631 USTPUTC(CTLESC, out);
10632 USTPUTC('\\', out);
10634 } else if (c == '\n') {
10638 #if ENABLE_ASH_EXPAND_PRMT
10639 if (c == '$' && pssyntax) {
10640 USTPUTC(CTLESC, out);
10641 USTPUTC('\\', out);
10644 if (dblquote && c != '\\'
10645 && c != '`' && c != '$'
10646 && (c != '"' || eofmark != NULL)
10648 USTPUTC(CTLESC, out);
10649 USTPUTC('\\', out);
10651 if (SIT(c, SQSYNTAX) == CCTL)
10652 USTPUTC(CTLESC, out);
10660 if (eofmark == NULL) {
10661 USTPUTC(CTLQUOTEMARK, out);
10669 USE_ASH_BASH_COMPAT(bash_dollar_squote = 0;)
10670 if (eofmark != NULL && arinest == 0
10675 if (dqvarnest == 0) {
10676 syntax = BASESYNTAX;
10683 case CVAR: /* '$' */
10684 PARSESUB(); /* parse substitution */
10686 case CENDVAR: /* '}' */
10689 if (dqvarnest > 0) {
10692 USTPUTC(CTLENDVAR, out);
10697 #if ENABLE_ASH_MATH_SUPPORT
10698 case CLP: /* '(' in arithmetic */
10702 case CRP: /* ')' in arithmetic */
10703 if (parenlevel > 0) {
10707 if (pgetc() == ')') {
10708 if (--arinest == 0) {
10709 USTPUTC(CTLENDARI, out);
10710 syntax = prevsyntax;
10711 dblquote = (syntax == DQSYNTAX);
10716 * unbalanced parens
10717 * (don't 2nd guess - no error)
10725 case CBQUOTE: /* '`' */
10729 goto endword; /* exit outer loop */
10734 goto endword; /* exit outer loop */
10735 #if ENABLE_ASH_ALIAS
10745 #if ENABLE_ASH_MATH_SUPPORT
10746 if (syntax == ARISYNTAX)
10747 raise_error_syntax("Missing '))'");
10749 if (syntax != BASESYNTAX && !parsebackquote && eofmark == NULL)
10750 raise_error_syntax("Unterminated quoted string");
10751 if (varnest != 0) {
10752 startlinno = plinno;
10754 raise_error_syntax("Missing '}'");
10756 USTPUTC('\0', out);
10757 len = out - (char *)stackblock();
10758 out = stackblock();
10759 if (eofmark == NULL) {
10760 if ((c == '>' || c == '<') && quotef == 0) {
10761 int maxlen = 9 + 1; /* max 9 digit fd#: 999999999 */
10763 while (--maxlen && isdigit(*np))
10766 PARSEREDIR(); /* passed as params: out, c */
10767 lasttoken = TREDIR;
10770 /* else: non-number X seen, interpret it
10771 * as "NNNX>file" = "NNNX >file" */
10775 quoteflag = quotef;
10776 backquotelist = bqlist;
10777 grabstackblock(len);
10781 /* end of readtoken routine */
10784 * Check to see whether we are at the end of the here document. When this
10785 * is called, c is set to the first character of the next input line. If
10786 * we are at the end of the here document, this routine sets the c to PEOF.
10790 #if ENABLE_ASH_ALIAS
10796 while (c == '\t') {
10800 if (c == *eofmark) {
10801 if (pfgets(line, sizeof(line)) != NULL) {
10805 for (q = eofmark + 1; *q && *p == *q; p++, q++)
10807 if (*p == '\n' && *q == '\0') {
10810 needprompt = doprompt;
10812 pushstring(line, NULL);
10817 goto checkend_return;
10821 * Parse a redirection operator. The variable "out" points to a string
10822 * specifying the fd to be redirected. The variable "c" contains the
10823 * first character of the redirection operator.
10826 /* out is already checked to be a valid number or "" */
10827 int fd = (*out == '\0' ? -1 : atoi(out));
10830 np = stzalloc(sizeof(struct nfile));
10835 np->type = NAPPEND;
10837 np->type = NCLOBBER;
10844 } else { /* c == '<' */
10845 /*np->nfile.fd = 0; - stzalloc did it */
10849 if (sizeof(struct nfile) != sizeof(struct nhere)) {
10850 np = stzalloc(sizeof(struct nhere));
10851 /*np->nfile.fd = 0; - stzalloc did it */
10854 heredoc = stzalloc(sizeof(struct heredoc));
10855 heredoc->here = np;
10858 heredoc->striptabs = 1;
10860 /*heredoc->striptabs = 0; - stzalloc did it */
10866 np->type = NFROMFD;
10870 np->type = NFROMTO;
10882 goto parseredir_return;
10886 * Parse a substitution. At this point, we have read the dollar sign
10887 * and nothing else.
10890 /* is_special(c) evaluates to 1 for c in "!#$*-0123456789?@"; 0 otherwise
10891 * (assuming ascii char codes, as the original implementation did) */
10892 #define is_special(c) \
10893 (((unsigned)(c) - 33 < 32) \
10894 && ((0xc1ff920dU >> ((unsigned)(c) - 33)) & 1))
10900 static const char types[] ALIGN1 = "}-+?=";
10903 if (c <= PEOA_OR_PEOF
10904 || (c != '(' && c != '{' && !is_name(c) && !is_special(c))
10906 #if ENABLE_ASH_BASH_COMPAT
10908 bash_dollar_squote = 1;
10913 } else if (c == '(') { /* $(command) or $((arith)) */
10914 if (pgetc() == '(') {
10915 #if ENABLE_ASH_MATH_SUPPORT
10918 raise_error_syntax("you disabled math support for $((arith)) syntax");
10925 USTPUTC(CTLVAR, out);
10926 typeloc = out - (char *)stackblock();
10927 USTPUTC(VSNORMAL, out);
10928 subtype = VSNORMAL;
10936 subtype = VSLENGTH;
10940 if (c > PEOA_OR_PEOF && is_name(c)) {
10944 } while (c > PEOA_OR_PEOF && is_in_name(c));
10945 } else if (isdigit(c)) {
10949 } while (isdigit(c));
10950 } else if (is_special(c)) {
10954 badsub: raise_error_syntax("Bad substitution");
10958 if (subtype == 0) {
10962 #if ENABLE_ASH_BASH_COMPAT
10963 if (c == ':' || c == '$' || isdigit(c)) {
10965 subtype = VSSUBSTR;
10972 p = strchr(types, c);
10975 subtype = p - types + VSNORMAL;
10980 subtype = c == '#' ? VSTRIMLEFT : VSTRIMRIGHT;
10988 #if ENABLE_ASH_BASH_COMPAT
10990 subtype = VSREPLACE;
10993 subtype++; /* VSREPLACEALL */
11002 if (dblquote || arinest)
11004 *((char *)stackblock() + typeloc) = subtype | flags;
11005 if (subtype != VSNORMAL) {
11007 if (dblquote || arinest) {
11012 goto parsesub_return;
11016 * Called to parse command substitutions. Newstyle is set if the command
11017 * is enclosed inside $(...); nlpp is a pointer to the head of the linked
11018 * list of commands (passed by reference), and savelen is the number of
11019 * characters on the top of the stack which must be preserved.
11022 struct nodelist **nlpp;
11025 char *volatile str;
11026 struct jmploc jmploc;
11027 struct jmploc *volatile savehandler;
11029 smallint saveprompt = 0;
11032 (void) &saveprompt;
11034 savepbq = parsebackquote;
11035 if (setjmp(jmploc.loc)) {
11037 parsebackquote = 0;
11038 exception_handler = savehandler;
11039 longjmp(exception_handler->loc, 1);
11043 savelen = out - (char *)stackblock();
11045 str = ckmalloc(savelen);
11046 memcpy(str, stackblock(), savelen);
11048 savehandler = exception_handler;
11049 exception_handler = &jmploc;
11052 /* We must read until the closing backquote, giving special
11053 treatment to some slashes, and then push the string and
11054 reread it as input, interpreting it normally. */
11061 STARTSTACKSTR(pout);
11078 * If eating a newline, avoid putting
11079 * the newline into the new character
11080 * stream (via the STPUTC after the
11085 if (pc != '\\' && pc != '`' && pc != '$'
11086 && (!dblquote || pc != '"'))
11087 STPUTC('\\', pout);
11088 if (pc > PEOA_OR_PEOF) {
11094 #if ENABLE_ASH_ALIAS
11097 startlinno = plinno;
11098 raise_error_syntax("EOF in backquote substitution");
11102 needprompt = doprompt;
11111 STPUTC('\0', pout);
11112 psavelen = pout - (char *)stackblock();
11113 if (psavelen > 0) {
11114 pstr = grabstackstr(pout);
11115 setinputstring(pstr);
11120 nlpp = &(*nlpp)->next;
11121 *nlpp = stzalloc(sizeof(**nlpp));
11122 /* (*nlpp)->next = NULL; - stzalloc did it */
11123 parsebackquote = oldstyle;
11126 saveprompt = doprompt;
11133 doprompt = saveprompt;
11134 else if (readtoken() != TRP)
11135 raise_error_unexpected_syntax(TRP);
11140 * Start reading from old file again, ignoring any pushed back
11141 * tokens left from the backquote parsing
11146 while (stackblocksize() <= savelen)
11148 STARTSTACKSTR(out);
11150 memcpy(out, str, savelen);
11151 STADJUST(savelen, out);
11157 parsebackquote = savepbq;
11158 exception_handler = savehandler;
11159 if (arinest || dblquote)
11160 USTPUTC(CTLBACKQ | CTLQUOTE, out);
11162 USTPUTC(CTLBACKQ, out);
11164 goto parsebackq_oldreturn;
11165 goto parsebackq_newreturn;
11168 #if ENABLE_ASH_MATH_SUPPORT
11170 * Parse an arithmetic expansion (indicate start of one and set state)
11173 if (++arinest == 1) {
11174 prevsyntax = syntax;
11175 syntax = ARISYNTAX;
11176 USTPUTC(CTLARI, out);
11183 * we collapse embedded arithmetic expansion to
11184 * parenthesis, which should be equivalent
11188 goto parsearith_return;
11192 } /* end of readtoken */
11195 * Read the next input token.
11196 * If the token is a word, we set backquotelist to the list of cmds in
11197 * backquotes. We set quoteflag to true if any part of the word was
11199 * If the token is TREDIR, then we set redirnode to a structure containing
11201 * In all cases, the variable startlinno is set to the number of the line
11202 * on which the token starts.
11204 * [Change comment: here documents and internal procedures]
11205 * [Readtoken shouldn't have any arguments. Perhaps we should make the
11206 * word parsing code into a separate routine. In this case, readtoken
11207 * doesn't need to have any internal procedures, but parseword does.
11208 * We could also make parseoperator in essence the main routine, and
11209 * have parseword (readtoken1?) handle both words and redirection.]
11211 #define NEW_xxreadtoken
11212 #ifdef NEW_xxreadtoken
11213 /* singles must be first! */
11214 static const char xxreadtoken_chars[7] ALIGN1 = {
11215 '\n', '(', ')', '&', '|', ';', 0
11218 static const char xxreadtoken_tokens[] ALIGN1 = {
11219 TNL, TLP, TRP, /* only single occurrence allowed */
11220 TBACKGND, TPIPE, TSEMI, /* if single occurrence */
11221 TEOF, /* corresponds to trailing nul */
11222 TAND, TOR, TENDCASE /* if double occurrence */
11225 #define xxreadtoken_doubles \
11226 (sizeof(xxreadtoken_tokens) - sizeof(xxreadtoken_chars))
11227 #define xxreadtoken_singles \
11228 (sizeof(xxreadtoken_chars) - xxreadtoken_doubles - 1)
11242 startlinno = plinno;
11243 for (;;) { /* until token or start of word found */
11246 if ((c != ' ') && (c != '\t')
11247 #if ENABLE_ASH_ALIAS
11252 while ((c = pgetc()) != '\n' && c != PEOF)
11255 } else if (c == '\\') {
11256 if (pgetc() != '\n') {
11260 startlinno = ++plinno;
11265 = xxreadtoken_chars + sizeof(xxreadtoken_chars) - 1;
11270 needprompt = doprompt;
11273 p = strchr(xxreadtoken_chars, c);
11276 return readtoken1(c, BASESYNTAX, (char *) NULL, 0);
11279 if ((size_t)(p - xxreadtoken_chars) >= xxreadtoken_singles) {
11280 if (pgetc() == *p) { /* double occurrence? */
11281 p += xxreadtoken_doubles + 1;
11287 lasttoken = xxreadtoken_tokens[p - xxreadtoken_chars];
11294 #define RETURN(token) return lasttoken = token
11307 startlinno = plinno;
11308 for (;;) { /* until token or start of word found */
11311 case ' ': case '\t':
11312 #if ENABLE_ASH_ALIAS
11317 while ((c = pgetc()) != '\n' && c != PEOF)
11322 if (pgetc() == '\n') {
11323 startlinno = ++plinno;
11332 needprompt = doprompt;
11337 if (pgetc() == '&')
11342 if (pgetc() == '|')
11347 if (pgetc() == ';')
11360 return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
11363 #endif /* NEW_xxreadtoken */
11370 smallint alreadyseen = tokpushback;
11373 #if ENABLE_ASH_ALIAS
11382 if (checkkwd & CHKNL) {
11389 if (t != TWORD || quoteflag) {
11394 * check for keywords
11396 if (checkkwd & CHKKWD) {
11397 const char *const *pp;
11399 pp = findkwd(wordtext);
11401 lasttoken = t = pp - tokname_array;
11402 TRACE(("keyword %s recognized\n", tokname(t)));
11407 if (checkkwd & CHKALIAS) {
11408 #if ENABLE_ASH_ALIAS
11410 ap = lookupalias(wordtext, 1);
11413 pushstring(ap->val, ap);
11423 TRACE(("token %s %s\n", tokname(t), t == TWORD ? wordtext : ""));
11425 TRACE(("reread token %s %s\n", tokname(t), t == TWORD ? wordtext : ""));
11437 return tokname_array[t][0];
11441 * Read and parse a command. Returns NEOF on end of file. (NULL is a
11442 * valid parse tree indicating a blank line.)
11444 static union node *
11445 parsecmd(int interact)
11450 doprompt = interact;
11452 setprompt(doprompt);
11464 * Input any here documents.
11469 struct heredoc *here;
11472 here = heredoclist;
11473 heredoclist = NULL;
11479 readtoken1(pgetc(), here->here->type == NHERE? SQSYNTAX : DQSYNTAX,
11480 here->eofmark, here->striptabs);
11481 n = stzalloc(sizeof(struct narg));
11482 n->narg.type = NARG;
11483 /*n->narg.next = NULL; - stzalloc did it */
11484 n->narg.text = wordtext;
11485 n->narg.backquote = backquotelist;
11486 here->here->nhere.doc = n;
11493 * called by editline -- any expansions to the prompt should be added here.
11495 #if ENABLE_ASH_EXPAND_PRMT
11496 static const char *
11497 expandstr(const char *ps)
11501 /* XXX Fix (char *) cast. */
11502 setinputstring((char *)ps);
11503 readtoken1(pgetc(), PSSYNTAX, nullstr, 0);
11506 n.narg.type = NARG;
11507 n.narg.next = NULL;
11508 n.narg.text = wordtext;
11509 n.narg.backquote = backquotelist;
11511 expandarg(&n, NULL, 0);
11512 return stackblock();
11517 * Execute a command or commands contained in a string.
11520 evalstring(char *s, int mask)
11523 struct stackmark smark;
11527 setstackmark(&smark);
11530 while ((n = parsecmd(0)) != NEOF) {
11532 popstackmark(&smark);
11545 * The eval command.
11548 evalcmd(int argc UNUSED_PARAM, char **argv)
11557 STARTSTACKSTR(concat);
11559 concat = stack_putstr(p, concat);
11563 STPUTC(' ', concat);
11565 STPUTC('\0', concat);
11566 p = grabstackstr(concat);
11568 evalstring(p, ~SKIPEVAL);
11575 * Read and execute commands. "Top" is nonzero for the top level command
11576 * loop; it turns on prompting if the shell is interactive.
11582 struct stackmark smark;
11586 TRACE(("cmdloop(%d) called\n", top));
11590 setstackmark(&smark);
11593 showjobs(stderr, SHOW_CHANGED);
11596 if (iflag && top) {
11598 #if ENABLE_ASH_MAIL
11602 n = parsecmd(inter);
11603 /* showtree(n); DEBUG */
11605 if (!top || numeof >= 50)
11607 if (!stoppedjobs()) {
11610 out2str("\nUse \"exit\" to leave shell.\n");
11613 } else if (nflag == 0) {
11614 /* job_warning can only be 2,1,0. Here 2->1, 1/0->0 */
11619 popstackmark(&smark);
11624 return skip & SKIPEVAL;
11631 * Take commands from a file. To be compatible we should do a path
11632 * search for the file, which is necessary to find sub-commands.
11635 find_dot_file(char *name)
11638 const char *path = pathval();
11641 /* don't try this for absolute or relative paths */
11642 if (strchr(name, '/'))
11645 while ((fullname = padvance(&path, name)) != NULL) {
11646 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
11648 * Don't bother freeing here, since it will
11649 * be freed by the caller.
11653 stunalloc(fullname);
11656 /* not found in the PATH */
11657 ash_msg_and_raise_error("%s: not found", name);
11662 dotcmd(int argc, char **argv)
11664 struct strlist *sp;
11665 volatile struct shparam saveparam;
11668 for (sp = cmdenviron; sp; sp = sp->next)
11669 setvareq(ckstrdup(sp->text), VSTRFIXED | VTEXTFIXED);
11671 if (argv[1]) { /* That's what SVR2 does */
11672 char *fullname = find_dot_file(argv[1]);
11675 if (argc) { /* argc > 0, argv[0] != NULL */
11676 saveparam = shellparam;
11677 shellparam.malloced = 0;
11678 shellparam.nparam = argc;
11679 shellparam.p = argv;
11682 setinputfile(fullname, INPUT_PUSH_FILE);
11683 commandname = fullname;
11688 freeparam(&shellparam);
11689 shellparam = saveparam;
11691 status = exitstatus;
11697 exitcmd(int argc UNUSED_PARAM, char **argv)
11702 exitstatus = number(argv[1]);
11703 raise_exception(EXEXIT);
11708 * Read a file containing shell functions.
11711 readcmdfile(char *name)
11713 setinputfile(name, INPUT_PUSH_FILE);
11719 /* ============ find_command inplementation */
11722 * Resolve a command name. If you change this routine, you may have to
11723 * change the shellexec routine as well.
11726 find_command(char *name, struct cmdentry *entry, int act, const char *path)
11728 struct tblentry *cmdp;
11735 struct builtincmd *bcmd;
11737 /* If name contains a slash, don't use PATH or hash table */
11738 if (strchr(name, '/') != NULL) {
11739 entry->u.index = -1;
11740 if (act & DO_ABS) {
11741 while (stat(name, &statb) < 0) {
11743 if (errno == EINTR)
11746 entry->cmdtype = CMDUNKNOWN;
11750 entry->cmdtype = CMDNORMAL;
11754 /* #if ENABLE_FEATURE_SH_STANDALONE... moved after builtin check */
11756 updatetbl = (path == pathval());
11759 if (strstr(path, "%builtin") != NULL)
11760 act |= DO_ALTBLTIN;
11763 /* If name is in the table, check answer will be ok */
11764 cmdp = cmdlookup(name, 0);
11765 if (cmdp != NULL) {
11768 switch (cmdp->cmdtype) {
11786 } else if (cmdp->rehash == 0)
11787 /* if not invalidated by cd, we're done */
11791 /* If %builtin not in path, check for builtin next */
11792 bcmd = find_builtin(name);
11794 if (IS_BUILTIN_REGULAR(bcmd))
11795 goto builtin_success;
11796 if (act & DO_ALTPATH) {
11797 if (!(act & DO_ALTBLTIN))
11798 goto builtin_success;
11799 } else if (builtinloc <= 0) {
11800 goto builtin_success;
11804 #if ENABLE_FEATURE_SH_STANDALONE
11806 int applet_no = find_applet_by_name(name);
11807 if (applet_no >= 0) {
11808 entry->cmdtype = CMDNORMAL;
11809 entry->u.index = -2 - applet_no;
11815 /* We have to search path. */
11816 prev = -1; /* where to start */
11817 if (cmdp && cmdp->rehash) { /* doing a rehash */
11818 if (cmdp->cmdtype == CMDBUILTIN)
11821 prev = cmdp->param.index;
11827 while ((fullname = padvance(&path, name)) != NULL) {
11828 stunalloc(fullname);
11829 /* NB: code below will still use fullname
11830 * despite it being "unallocated" */
11833 if (prefix(pathopt, "builtin")) {
11835 goto builtin_success;
11838 if ((act & DO_NOFUNC)
11839 || !prefix(pathopt, "func")
11840 ) { /* ignore unimplemented options */
11844 /* if rehash, don't redo absolute path names */
11845 if (fullname[0] == '/' && idx <= prev) {
11848 TRACE(("searchexec \"%s\": no change\n", name));
11851 while (stat(fullname, &statb) < 0) {
11853 if (errno == EINTR)
11856 if (errno != ENOENT && errno != ENOTDIR)
11860 e = EACCES; /* if we fail, this will be the error */
11861 if (!S_ISREG(statb.st_mode))
11863 if (pathopt) { /* this is a %func directory */
11864 stalloc(strlen(fullname) + 1);
11865 /* NB: stalloc will return space pointed by fullname
11866 * (because we don't have any intervening allocations
11867 * between stunalloc above and this stalloc) */
11868 readcmdfile(fullname);
11869 cmdp = cmdlookup(name, 0);
11870 if (cmdp == NULL || cmdp->cmdtype != CMDFUNCTION)
11871 ash_msg_and_raise_error("%s not defined in %s", name, fullname);
11872 stunalloc(fullname);
11875 TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
11877 entry->cmdtype = CMDNORMAL;
11878 entry->u.index = idx;
11882 cmdp = cmdlookup(name, 1);
11883 cmdp->cmdtype = CMDNORMAL;
11884 cmdp->param.index = idx;
11889 /* We failed. If there was an entry for this command, delete it */
11890 if (cmdp && updatetbl)
11891 delete_cmd_entry();
11893 ash_msg("%s: %s", name, errmsg(e, "not found"));
11894 entry->cmdtype = CMDUNKNOWN;
11899 entry->cmdtype = CMDBUILTIN;
11900 entry->u.cmd = bcmd;
11904 cmdp = cmdlookup(name, 1);
11905 cmdp->cmdtype = CMDBUILTIN;
11906 cmdp->param.cmd = bcmd;
11910 entry->cmdtype = cmdp->cmdtype;
11911 entry->u = cmdp->param;
11915 /* ============ trap.c */
11918 * The trap builtin.
11921 trapcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
11930 for (signo = 0; signo < NSIG; signo++) {
11931 if (trap[signo] != NULL) {
11932 out1fmt("trap -- %s %s\n",
11933 single_quote(trap[signo]),
11934 get_signame(signo));
11943 signo = get_signum(*ap);
11945 ash_msg_and_raise_error("%s: bad trap", *ap);
11948 if (LONE_DASH(action))
11951 action = ckstrdup(action);
11954 trap[signo] = action;
11964 /* ============ Builtins */
11966 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
11968 * Lists available builtins
11971 helpcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
11976 out1fmt("\nBuilt-in commands:\n-------------------\n");
11977 for (col = 0, i = 0; i < ARRAY_SIZE(builtintab); i++) {
11978 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '),
11979 builtintab[i].name + 1);
11985 #if ENABLE_FEATURE_SH_STANDALONE
11987 const char *a = applet_names;
11989 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '), a);
11994 a += strlen(a) + 1;
11999 return EXIT_SUCCESS;
12001 #endif /* FEATURE_SH_EXTRA_QUIET */
12004 * The export and readonly commands.
12007 exportcmd(int argc UNUSED_PARAM, char **argv)
12013 int flag = argv[0][0] == 'r'? VREADONLY : VEXPORT;
12015 if (nextopt("p") != 'p') {
12020 p = strchr(name, '=');
12024 vp = *findvar(hashvar(name), name);
12030 setvar(name, p, flag);
12031 } while ((name = *++aptr) != NULL);
12035 showvars(argv[0], flag, 0);
12040 * Delete a function if it exists.
12043 unsetfunc(const char *name)
12045 struct tblentry *cmdp;
12047 cmdp = cmdlookup(name, 0);
12048 if (cmdp!= NULL && cmdp->cmdtype == CMDFUNCTION)
12049 delete_cmd_entry();
12053 * The unset builtin command. We unset the function before we unset the
12054 * variable to allow a function to be unset when there is a readonly variable
12055 * with the same name.
12058 unsetcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12065 while ((i = nextopt("vf")) != '\0') {
12069 for (ap = argptr; *ap; ap++) {
12085 #include <sys/times.h>
12087 static const unsigned char timescmd_str[] ALIGN1 = {
12088 ' ', offsetof(struct tms, tms_utime),
12089 '\n', offsetof(struct tms, tms_stime),
12090 ' ', offsetof(struct tms, tms_cutime),
12091 '\n', offsetof(struct tms, tms_cstime),
12096 timescmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12098 long clk_tck, s, t;
12099 const unsigned char *p;
12102 clk_tck = sysconf(_SC_CLK_TCK);
12107 t = *(clock_t *)(((char *) &buf) + p[1]);
12109 out1fmt("%ldm%ld.%.3lds%c",
12111 ((t - s * clk_tck) * 1000) / clk_tck,
12113 } while (*(p += 2));
12118 #if ENABLE_ASH_MATH_SUPPORT
12120 dash_arith(const char *s)
12126 result = arith(s, &errcode);
12129 ash_msg_and_raise_error("exponent less than 0");
12131 ash_msg_and_raise_error("divide by zero");
12133 ash_msg_and_raise_error("expression recursion loop detected");
12134 raise_error_syntax(s);
12142 * The let builtin. partial stolen from GNU Bash, the Bourne Again SHell.
12143 * Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
12145 * Copyright (C) 2003 Vladimir Oleynik <dzo@simtreas.ru>
12148 letcmd(int argc UNUSED_PARAM, char **argv)
12154 ash_msg_and_raise_error("expression expected");
12156 i = dash_arith(*argv);
12161 #endif /* ASH_MATH_SUPPORT */
12164 /* ============ miscbltin.c
12166 * Miscellaneous builtins.
12171 #if defined(__GLIBC__) && __GLIBC__ == 2 && __GLIBC_MINOR__ < 1
12172 typedef enum __rlimit_resource rlim_t;
12176 * The read builtin. Options:
12177 * -r Do not interpret '\' specially
12178 * -s Turn off echo (tty only)
12179 * -n NCHARS Read NCHARS max
12180 * -p PROMPT Display PROMPT on stderr (if input is from tty)
12181 * -t SECONDS Timeout after SECONDS (tty or pipe only)
12182 * -u FD Read from given FD instead of fd 0
12183 * This uses unbuffered input, which may be avoidable in some cases.
12184 * TODO: bash also has:
12185 * -a ARRAY Read into array[0],[1],etc
12186 * -d DELIM End on DELIM char, not newline
12187 * -e Use line editing (tty only)
12190 readcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12192 static const char *const arg_REPLY[] = { "REPLY", NULL };
12205 #if ENABLE_ASH_READ_NCHARS
12206 int nchars = 0; /* if != 0, -n is in effect */
12208 struct termios tty, old_tty;
12210 #if ENABLE_ASH_READ_TIMEOUT
12211 unsigned end_ms = 0;
12212 unsigned timeout = 0;
12217 while ((i = nextopt("p:u:r"
12218 USE_ASH_READ_TIMEOUT("t:")
12219 USE_ASH_READ_NCHARS("n:s")
12223 prompt = optionarg;
12225 #if ENABLE_ASH_READ_NCHARS
12227 nchars = bb_strtou(optionarg, NULL, 10);
12228 if (nchars < 0 || errno)
12229 ash_msg_and_raise_error("invalid count");
12230 /* nchars == 0: off (bash 3.2 does this too) */
12236 #if ENABLE_ASH_READ_TIMEOUT
12238 timeout = bb_strtou(optionarg, NULL, 10);
12239 if (errno || timeout > UINT_MAX / 2048)
12240 ash_msg_and_raise_error("invalid timeout");
12242 #if 0 /* even bash have no -t N.NNN support */
12243 ts.tv_sec = bb_strtou(optionarg, &p, 10);
12245 /* EINVAL means number is ok, but not terminated by NUL */
12246 if (*p == '.' && errno == EINVAL) {
12250 ts.tv_usec = bb_strtou(p, &p2, 10);
12252 ash_msg_and_raise_error("invalid timeout");
12254 /* normalize to usec */
12256 ash_msg_and_raise_error("invalid timeout");
12257 while (scale++ < 6)
12260 } else if (ts.tv_sec < 0 || errno) {
12261 ash_msg_and_raise_error("invalid timeout");
12263 if (!(ts.tv_sec | ts.tv_usec)) { /* both are 0? */
12264 ash_msg_and_raise_error("invalid timeout");
12273 fd = bb_strtou(optionarg, NULL, 10);
12274 if (fd < 0 || errno)
12275 ash_msg_and_raise_error("invalid file descriptor");
12281 if (prompt && isatty(fd)) {
12286 ap = (char**)arg_REPLY;
12287 ifs = bltinlookup("IFS");
12290 #if ENABLE_ASH_READ_NCHARS
12291 tcgetattr(fd, &tty);
12293 if (nchars || silent) {
12295 tty.c_lflag &= ~ICANON;
12296 tty.c_cc[VMIN] = nchars < 256 ? nchars : 255;
12299 tty.c_lflag &= ~(ECHO | ECHOK | ECHONL);
12301 /* if tcgetattr failed, tcsetattr will fail too.
12302 * Ignoring, it's harmless. */
12303 tcsetattr(fd, TCSANOW, &tty);
12310 #if ENABLE_ASH_READ_TIMEOUT
12311 if (timeout) /* NB: ensuring end_ms is nonzero */
12312 end_ms = ((unsigned)(monotonic_us() / 1000) + timeout) | 1;
12316 #if ENABLE_ASH_READ_TIMEOUT
12318 struct pollfd pfd[1];
12320 pfd[0].events = POLLIN;
12321 timeout = end_ms - (unsigned)(monotonic_us() / 1000);
12322 if ((int)timeout <= 0 /* already late? */
12323 || safe_poll(pfd, 1, timeout) != 1 /* no? wait... */
12324 ) { /* timed out! */
12325 #if ENABLE_ASH_READ_NCHARS
12326 tcsetattr(fd, TCSANOW, &old_tty);
12332 if (nonblock_safe_read(fd, &c, 1) != 1) {
12344 if (!rflag && c == '\\') {
12350 if (startword && *ifs == ' ' && strchr(ifs, c)) {
12354 if (ap[1] != NULL && strchr(ifs, c) != NULL) {
12356 setvar(*ap, stackblock(), 0);
12365 /* end of do {} while: */
12366 #if ENABLE_ASH_READ_NCHARS
12372 #if ENABLE_ASH_READ_NCHARS
12373 tcsetattr(fd, TCSANOW, &old_tty);
12377 /* Remove trailing blanks */
12378 while ((char *)stackblock() <= --p && strchr(ifs, *p) != NULL)
12380 setvar(*ap, stackblock(), 0);
12381 while (*++ap != NULL)
12382 setvar(*ap, nullstr, 0);
12387 umaskcmd(int argc UNUSED_PARAM, char **argv)
12389 static const char permuser[3] ALIGN1 = "ugo";
12390 static const char permmode[3] ALIGN1 = "rwx";
12391 static const short permmask[] ALIGN2 = {
12392 S_IRUSR, S_IWUSR, S_IXUSR,
12393 S_IRGRP, S_IWGRP, S_IXGRP,
12394 S_IROTH, S_IWOTH, S_IXOTH
12400 int symbolic_mode = 0;
12402 while (nextopt("S") != '\0') {
12413 if (symbolic_mode) {
12417 for (i = 0; i < 3; i++) {
12420 *p++ = permuser[i];
12422 for (j = 0; j < 3; j++) {
12423 if ((mask & permmask[3 * i + j]) == 0) {
12424 *p++ = permmode[j];
12432 out1fmt("%.4o\n", mask);
12435 if (isdigit((unsigned char) *ap)) {
12438 if (*ap >= '8' || *ap < '0')
12439 ash_msg_and_raise_error(illnum, argv[1]);
12440 mask = (mask << 3) + (*ap - '0');
12441 } while (*++ap != '\0');
12444 mask = ~mask & 0777;
12445 if (!bb_parse_mode(ap, &mask)) {
12446 ash_msg_and_raise_error("illegal mode: %s", ap);
12448 umask(~mask & 0777);
12457 * This code, originally by Doug Gwyn, Doug Kingston, Eric Gisin, and
12458 * Michael Rendell was ripped from pdksh 5.0.8 and hacked for use with
12459 * ash by J.T. Conklin.
12465 uint8_t cmd; /* RLIMIT_xxx fit into it */
12466 uint8_t factor_shift; /* shift by to get rlim_{cur,max} values */
12470 static const struct limits limits_tbl[] = {
12472 { RLIMIT_CPU, 0, 't' },
12474 #ifdef RLIMIT_FSIZE
12475 { RLIMIT_FSIZE, 9, 'f' },
12478 { RLIMIT_DATA, 10, 'd' },
12480 #ifdef RLIMIT_STACK
12481 { RLIMIT_STACK, 10, 's' },
12484 { RLIMIT_CORE, 9, 'c' },
12487 { RLIMIT_RSS, 10, 'm' },
12489 #ifdef RLIMIT_MEMLOCK
12490 { RLIMIT_MEMLOCK, 10, 'l' },
12492 #ifdef RLIMIT_NPROC
12493 { RLIMIT_NPROC, 0, 'p' },
12495 #ifdef RLIMIT_NOFILE
12496 { RLIMIT_NOFILE, 0, 'n' },
12499 { RLIMIT_AS, 10, 'v' },
12501 #ifdef RLIMIT_LOCKS
12502 { RLIMIT_LOCKS, 0, 'w' },
12505 static const char limits_name[] =
12507 "time(seconds)" "\0"
12509 #ifdef RLIMIT_FSIZE
12510 "file(blocks)" "\0"
12515 #ifdef RLIMIT_STACK
12519 "coredump(blocks)" "\0"
12524 #ifdef RLIMIT_MEMLOCK
12525 "locked memory(kb)" "\0"
12527 #ifdef RLIMIT_NPROC
12530 #ifdef RLIMIT_NOFILE
12536 #ifdef RLIMIT_LOCKS
12541 enum limtype { SOFT = 0x1, HARD = 0x2 };
12544 printlim(enum limtype how, const struct rlimit *limit,
12545 const struct limits *l)
12549 val = limit->rlim_max;
12551 val = limit->rlim_cur;
12553 if (val == RLIM_INFINITY)
12554 out1fmt("unlimited\n");
12556 val >>= l->factor_shift;
12557 out1fmt("%lld\n", (long long) val);
12562 ulimitcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12566 enum limtype how = SOFT | HARD;
12567 const struct limits *l;
12570 struct rlimit limit;
12573 while ((optc = nextopt("HSa"
12577 #ifdef RLIMIT_FSIZE
12583 #ifdef RLIMIT_STACK
12592 #ifdef RLIMIT_MEMLOCK
12595 #ifdef RLIMIT_NPROC
12598 #ifdef RLIMIT_NOFILE
12604 #ifdef RLIMIT_LOCKS
12622 for (l = limits_tbl; l->option != what; l++)
12625 set = *argptr ? 1 : 0;
12629 if (all || argptr[1])
12630 ash_msg_and_raise_error("too many arguments");
12631 if (strncmp(p, "unlimited\n", 9) == 0)
12632 val = RLIM_INFINITY;
12636 while ((c = *p++) >= '0' && c <= '9') {
12637 val = (val * 10) + (long)(c - '0');
12638 // val is actually 'unsigned long int' and can't get < 0
12639 if (val < (rlim_t) 0)
12643 ash_msg_and_raise_error("bad number");
12644 val <<= l->factor_shift;
12648 const char *lname = limits_name;
12649 for (l = limits_tbl; l != &limits_tbl[ARRAY_SIZE(limits_tbl)]; l++) {
12650 getrlimit(l->cmd, &limit);
12651 out1fmt("%-20s ", lname);
12652 lname += strlen(lname) + 1;
12653 printlim(how, &limit, l);
12658 getrlimit(l->cmd, &limit);
12661 limit.rlim_max = val;
12663 limit.rlim_cur = val;
12664 if (setrlimit(l->cmd, &limit) < 0)
12665 ash_msg_and_raise_error("error setting limit (%m)");
12667 printlim(how, &limit, l);
12673 /* ============ Math support */
12675 #if ENABLE_ASH_MATH_SUPPORT
12677 /* Copyright (c) 2001 Aaron Lehmann <aaronl@vitelus.com>
12679 Permission is hereby granted, free of charge, to any person obtaining
12680 a copy of this software and associated documentation files (the
12681 "Software"), to deal in the Software without restriction, including
12682 without limitation the rights to use, copy, modify, merge, publish,
12683 distribute, sublicense, and/or sell copies of the Software, and to
12684 permit persons to whom the Software is furnished to do so, subject to
12685 the following conditions:
12687 The above copyright notice and this permission notice shall be
12688 included in all copies or substantial portions of the Software.
12690 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
12691 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
12692 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
12693 IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
12694 CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
12695 TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
12696 SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
12699 /* This is my infix parser/evaluator. It is optimized for size, intended
12700 * as a replacement for yacc-based parsers. However, it may well be faster
12701 * than a comparable parser written in yacc. The supported operators are
12702 * listed in #defines below. Parens, order of operations, and error handling
12703 * are supported. This code is thread safe. The exact expression format should
12704 * be that which POSIX specifies for shells. */
12706 /* The code uses a simple two-stack algorithm. See
12707 * http://www.onthenet.com.au/~grahamis/int2008/week02/lect02.html
12708 * for a detailed explanation of the infix-to-postfix algorithm on which
12709 * this is based (this code differs in that it applies operators immediately
12710 * to the stack instead of adding them to a queue to end up with an
12713 /* To use the routine, call it with an expression string and error return
12717 * Aug 24, 2001 Manuel Novoa III
12719 * Reduced the generated code size by about 30% (i386) and fixed several bugs.
12721 * 1) In arith_apply():
12722 * a) Cached values of *numptr and &(numptr[-1]).
12723 * b) Removed redundant test for zero denominator.
12726 * a) Eliminated redundant code for processing operator tokens by moving
12727 * to a table-based implementation. Also folded handling of parens
12729 * b) Combined all 3 loops which called arith_apply to reduce generated
12730 * code size at the cost of speed.
12732 * 3) The following expressions were treated as valid by the original code:
12733 * 1() , 0! , 1 ( *3 ) .
12734 * These bugs have been fixed by internally enclosing the expression in
12735 * parens and then checking that all binary ops and right parens are
12736 * preceded by a valid expression (NUM_TOKEN).
12738 * Note: It may be desirable to replace Aaron's test for whitespace with
12739 * ctype's isspace() if it is used by another busybox applet or if additional
12740 * whitespace chars should be considered. Look below the "#include"s for a
12741 * precompiler test.
12745 * Aug 26, 2001 Manuel Novoa III
12747 * Return 0 for null expressions. Pointed out by Vladimir Oleynik.
12749 * Merge in Aaron's comments previously posted to the busybox list,
12750 * modified slightly to take account of my changes to the code.
12755 * (C) 2003 Vladimir Oleynik <dzo@simtreas.ru>
12757 * - allow access to variable,
12758 * used recursive find value indirection (c=2*2; a="c"; $((a+=2)) produce 6)
12759 * - realize assign syntax (VAR=expr, +=, *= etc)
12760 * - realize exponentiation (** operator)
12761 * - realize comma separated - expr, expr
12762 * - realise ++expr --expr expr++ expr--
12763 * - realise expr ? expr : expr (but, second expr calculate always)
12764 * - allow hexadecimal and octal numbers
12765 * - was restored loses XOR operator
12766 * - remove one goto label, added three ;-)
12767 * - protect $((num num)) as true zero expr (Manuel`s error)
12768 * - always use special isspace(), see comment from bash ;-)
12771 #define arith_isspace(arithval) \
12772 (arithval == ' ' || arithval == '\n' || arithval == '\t')
12774 typedef unsigned char operator;
12776 /* An operator's token id is a bit of a bitfield. The lower 5 bits are the
12777 * precedence, and 3 high bits are an ID unique across operators of that
12778 * precedence. The ID portion is so that multiple operators can have the
12779 * same precedence, ensuring that the leftmost one is evaluated first.
12780 * Consider * and /. */
12782 #define tok_decl(prec,id) (((id)<<5)|(prec))
12783 #define PREC(op) ((op) & 0x1F)
12785 #define TOK_LPAREN tok_decl(0,0)
12787 #define TOK_COMMA tok_decl(1,0)
12789 #define TOK_ASSIGN tok_decl(2,0)
12790 #define TOK_AND_ASSIGN tok_decl(2,1)
12791 #define TOK_OR_ASSIGN tok_decl(2,2)
12792 #define TOK_XOR_ASSIGN tok_decl(2,3)
12793 #define TOK_PLUS_ASSIGN tok_decl(2,4)
12794 #define TOK_MINUS_ASSIGN tok_decl(2,5)
12795 #define TOK_LSHIFT_ASSIGN tok_decl(2,6)
12796 #define TOK_RSHIFT_ASSIGN tok_decl(2,7)
12798 #define TOK_MUL_ASSIGN tok_decl(3,0)
12799 #define TOK_DIV_ASSIGN tok_decl(3,1)
12800 #define TOK_REM_ASSIGN tok_decl(3,2)
12802 /* all assign is right associativity and precedence eq, but (7+3)<<5 > 256 */
12803 #define convert_prec_is_assing(prec) do { if (prec == 3) prec = 2; } while (0)
12805 /* conditional is right associativity too */
12806 #define TOK_CONDITIONAL tok_decl(4,0)
12807 #define TOK_CONDITIONAL_SEP tok_decl(4,1)
12809 #define TOK_OR tok_decl(5,0)
12811 #define TOK_AND tok_decl(6,0)
12813 #define TOK_BOR tok_decl(7,0)
12815 #define TOK_BXOR tok_decl(8,0)
12817 #define TOK_BAND tok_decl(9,0)
12819 #define TOK_EQ tok_decl(10,0)
12820 #define TOK_NE tok_decl(10,1)
12822 #define TOK_LT tok_decl(11,0)
12823 #define TOK_GT tok_decl(11,1)
12824 #define TOK_GE tok_decl(11,2)
12825 #define TOK_LE tok_decl(11,3)
12827 #define TOK_LSHIFT tok_decl(12,0)
12828 #define TOK_RSHIFT tok_decl(12,1)
12830 #define TOK_ADD tok_decl(13,0)
12831 #define TOK_SUB tok_decl(13,1)
12833 #define TOK_MUL tok_decl(14,0)
12834 #define TOK_DIV tok_decl(14,1)
12835 #define TOK_REM tok_decl(14,2)
12837 /* exponent is right associativity */
12838 #define TOK_EXPONENT tok_decl(15,1)
12840 /* For now unary operators. */
12841 #define UNARYPREC 16
12842 #define TOK_BNOT tok_decl(UNARYPREC,0)
12843 #define TOK_NOT tok_decl(UNARYPREC,1)
12845 #define TOK_UMINUS tok_decl(UNARYPREC+1,0)
12846 #define TOK_UPLUS tok_decl(UNARYPREC+1,1)
12848 #define PREC_PRE (UNARYPREC+2)
12850 #define TOK_PRE_INC tok_decl(PREC_PRE, 0)
12851 #define TOK_PRE_DEC tok_decl(PREC_PRE, 1)
12853 #define PREC_POST (UNARYPREC+3)
12855 #define TOK_POST_INC tok_decl(PREC_POST, 0)
12856 #define TOK_POST_DEC tok_decl(PREC_POST, 1)
12858 #define SPEC_PREC (UNARYPREC+4)
12860 #define TOK_NUM tok_decl(SPEC_PREC, 0)
12861 #define TOK_RPAREN tok_decl(SPEC_PREC, 1)
12863 #define NUMPTR (*numstackptr)
12866 tok_have_assign(operator op)
12868 operator prec = PREC(op);
12870 convert_prec_is_assing(prec);
12871 return (prec == PREC(TOK_ASSIGN) ||
12872 prec == PREC_PRE || prec == PREC_POST);
12876 is_right_associativity(operator prec)
12878 return (prec == PREC(TOK_ASSIGN) || prec == PREC(TOK_EXPONENT)
12879 || prec == PREC(TOK_CONDITIONAL));
12884 arith_t contidional_second_val;
12885 char contidional_second_val_initialized;
12886 char *var; /* if NULL then is regular number,
12887 else is variable name */
12890 typedef struct chk_var_recursive_looped_t {
12892 struct chk_var_recursive_looped_t *next;
12893 } chk_var_recursive_looped_t;
12895 static chk_var_recursive_looped_t *prev_chk_var_recursive;
12898 arith_lookup_val(v_n_t *t)
12901 const char * p = lookupvar(t->var);
12906 /* recursive try as expression */
12907 chk_var_recursive_looped_t *cur;
12908 chk_var_recursive_looped_t cur_save;
12910 for (cur = prev_chk_var_recursive; cur; cur = cur->next) {
12911 if (strcmp(cur->var, t->var) == 0) {
12912 /* expression recursion loop detected */
12916 /* save current lookuped var name */
12917 cur = prev_chk_var_recursive;
12918 cur_save.var = t->var;
12919 cur_save.next = cur;
12920 prev_chk_var_recursive = &cur_save;
12922 t->val = arith (p, &errcode);
12923 /* restore previous ptr after recursiving */
12924 prev_chk_var_recursive = cur;
12927 /* allow undefined var as 0 */
12933 /* "applying" a token means performing it on the top elements on the integer
12934 * stack. For a unary operator it will only change the top element, but a
12935 * binary operator will pop two arguments and push a result */
12937 arith_apply(operator op, v_n_t *numstack, v_n_t **numstackptr)
12940 arith_t numptr_val, rez;
12941 int ret_arith_lookup_val;
12943 /* There is no operator that can work without arguments */
12944 if (NUMPTR == numstack) goto err;
12945 numptr_m1 = NUMPTR - 1;
12947 /* check operand is var with noninteger value */
12948 ret_arith_lookup_val = arith_lookup_val(numptr_m1);
12949 if (ret_arith_lookup_val)
12950 return ret_arith_lookup_val;
12952 rez = numptr_m1->val;
12953 if (op == TOK_UMINUS)
12955 else if (op == TOK_NOT)
12957 else if (op == TOK_BNOT)
12959 else if (op == TOK_POST_INC || op == TOK_PRE_INC)
12961 else if (op == TOK_POST_DEC || op == TOK_PRE_DEC)
12963 else if (op != TOK_UPLUS) {
12964 /* Binary operators */
12966 /* check and binary operators need two arguments */
12967 if (numptr_m1 == numstack) goto err;
12969 /* ... and they pop one */
12972 if (op == TOK_CONDITIONAL) {
12973 if (!numptr_m1->contidional_second_val_initialized) {
12974 /* protect $((expr1 ? expr2)) without ": expr" */
12977 rez = numptr_m1->contidional_second_val;
12978 } else if (numptr_m1->contidional_second_val_initialized) {
12979 /* protect $((expr1 : expr2)) without "expr ? " */
12982 numptr_m1 = NUMPTR - 1;
12983 if (op != TOK_ASSIGN) {
12984 /* check operand is var with noninteger value for not '=' */
12985 ret_arith_lookup_val = arith_lookup_val(numptr_m1);
12986 if (ret_arith_lookup_val)
12987 return ret_arith_lookup_val;
12989 if (op == TOK_CONDITIONAL) {
12990 numptr_m1->contidional_second_val = rez;
12992 rez = numptr_m1->val;
12993 if (op == TOK_BOR || op == TOK_OR_ASSIGN)
12995 else if (op == TOK_OR)
12996 rez = numptr_val || rez;
12997 else if (op == TOK_BAND || op == TOK_AND_ASSIGN)
12999 else if (op == TOK_BXOR || op == TOK_XOR_ASSIGN)
13001 else if (op == TOK_AND)
13002 rez = rez && numptr_val;
13003 else if (op == TOK_EQ)
13004 rez = (rez == numptr_val);
13005 else if (op == TOK_NE)
13006 rez = (rez != numptr_val);
13007 else if (op == TOK_GE)
13008 rez = (rez >= numptr_val);
13009 else if (op == TOK_RSHIFT || op == TOK_RSHIFT_ASSIGN)
13010 rez >>= numptr_val;
13011 else if (op == TOK_LSHIFT || op == TOK_LSHIFT_ASSIGN)
13012 rez <<= numptr_val;
13013 else if (op == TOK_GT)
13014 rez = (rez > numptr_val);
13015 else if (op == TOK_LT)
13016 rez = (rez < numptr_val);
13017 else if (op == TOK_LE)
13018 rez = (rez <= numptr_val);
13019 else if (op == TOK_MUL || op == TOK_MUL_ASSIGN)
13021 else if (op == TOK_ADD || op == TOK_PLUS_ASSIGN)
13023 else if (op == TOK_SUB || op == TOK_MINUS_ASSIGN)
13025 else if (op == TOK_ASSIGN || op == TOK_COMMA)
13027 else if (op == TOK_CONDITIONAL_SEP) {
13028 if (numptr_m1 == numstack) {
13029 /* protect $((expr : expr)) without "expr ? " */
13032 numptr_m1->contidional_second_val_initialized = op;
13033 numptr_m1->contidional_second_val = numptr_val;
13034 } else if (op == TOK_CONDITIONAL) {
13036 numptr_val : numptr_m1->contidional_second_val;
13037 } else if (op == TOK_EXPONENT) {
13038 if (numptr_val < 0)
13039 return -3; /* exponent less than 0 */
13044 while (numptr_val--)
13048 } else if (numptr_val==0) /* zero divisor check */
13050 else if (op == TOK_DIV || op == TOK_DIV_ASSIGN)
13052 else if (op == TOK_REM || op == TOK_REM_ASSIGN)
13055 if (tok_have_assign(op)) {
13056 char buf[sizeof(arith_t_type)*3 + 2];
13058 if (numptr_m1->var == NULL) {
13062 /* save to shell variable */
13063 #if ENABLE_ASH_MATH_SUPPORT_64
13064 snprintf(buf, sizeof(buf), "%lld", (arith_t_type) rez);
13066 snprintf(buf, sizeof(buf), "%ld", (arith_t_type) rez);
13068 setvar(numptr_m1->var, buf, 0);
13069 /* after saving, make previous value for v++ or v-- */
13070 if (op == TOK_POST_INC)
13072 else if (op == TOK_POST_DEC)
13075 numptr_m1->val = rez;
13076 /* protect geting var value, is number now */
13077 numptr_m1->var = NULL;
13083 /* longest must be first */
13084 static const char op_tokens[] ALIGN1 = {
13085 '<','<','=',0, TOK_LSHIFT_ASSIGN,
13086 '>','>','=',0, TOK_RSHIFT_ASSIGN,
13087 '<','<', 0, TOK_LSHIFT,
13088 '>','>', 0, TOK_RSHIFT,
13089 '|','|', 0, TOK_OR,
13090 '&','&', 0, TOK_AND,
13091 '!','=', 0, TOK_NE,
13092 '<','=', 0, TOK_LE,
13093 '>','=', 0, TOK_GE,
13094 '=','=', 0, TOK_EQ,
13095 '|','=', 0, TOK_OR_ASSIGN,
13096 '&','=', 0, TOK_AND_ASSIGN,
13097 '*','=', 0, TOK_MUL_ASSIGN,
13098 '/','=', 0, TOK_DIV_ASSIGN,
13099 '%','=', 0, TOK_REM_ASSIGN,
13100 '+','=', 0, TOK_PLUS_ASSIGN,
13101 '-','=', 0, TOK_MINUS_ASSIGN,
13102 '-','-', 0, TOK_POST_DEC,
13103 '^','=', 0, TOK_XOR_ASSIGN,
13104 '+','+', 0, TOK_POST_INC,
13105 '*','*', 0, TOK_EXPONENT,
13109 '=', 0, TOK_ASSIGN,
13121 '?', 0, TOK_CONDITIONAL,
13122 ':', 0, TOK_CONDITIONAL_SEP,
13123 ')', 0, TOK_RPAREN,
13124 '(', 0, TOK_LPAREN,
13128 #define endexpression (&op_tokens[sizeof(op_tokens)-7])
13131 arith(const char *expr, int *perrcode)
13133 char arithval; /* Current character under analysis */
13134 operator lasttok, op;
13136 operator *stack, *stackptr;
13137 const char *p = endexpression;
13139 v_n_t *numstack, *numstackptr;
13140 unsigned datasizes = strlen(expr) + 2;
13142 /* Stack of integers */
13143 /* The proof that there can be no more than strlen(startbuf)/2+1 integers
13144 * in any given correct or incorrect expression is left as an exercise to
13146 numstackptr = numstack = alloca((datasizes / 2) * sizeof(numstack[0]));
13147 /* Stack of operator tokens */
13148 stackptr = stack = alloca(datasizes * sizeof(stack[0]));
13150 *stackptr++ = lasttok = TOK_LPAREN; /* start off with a left paren */
13151 *perrcode = errcode = 0;
13155 if (arithval == 0) {
13156 if (p == endexpression) {
13157 /* Null expression. */
13161 /* This is only reached after all tokens have been extracted from the
13162 * input stream. If there are still tokens on the operator stack, they
13163 * are to be applied in order. At the end, there should be a final
13164 * result on the integer stack */
13166 if (expr != endexpression + 1) {
13167 /* If we haven't done so already, */
13168 /* append a closing right paren */
13169 expr = endexpression;
13170 /* and let the loop process it. */
13173 /* At this point, we're done with the expression. */
13174 if (numstackptr != numstack+1) {
13175 /* ... but if there isn't, it's bad */
13180 if (numstack->var) {
13181 /* expression is $((var)) only, lookup now */
13182 errcode = arith_lookup_val(numstack);
13185 *perrcode = errcode;
13186 return numstack->val;
13189 /* Continue processing the expression. */
13190 if (arith_isspace(arithval)) {
13191 /* Skip whitespace */
13194 p = endofname(expr);
13196 size_t var_name_size = (p-expr) + 1; /* trailing zero */
13198 numstackptr->var = alloca(var_name_size);
13199 safe_strncpy(numstackptr->var, expr, var_name_size);
13202 numstackptr->contidional_second_val_initialized = 0;
13207 if (isdigit(arithval)) {
13208 numstackptr->var = NULL;
13209 #if ENABLE_ASH_MATH_SUPPORT_64
13210 numstackptr->val = strtoll(expr, (char **) &expr, 0);
13212 numstackptr->val = strtol(expr, (char **) &expr, 0);
13216 for (p = op_tokens; ; p++) {
13220 /* strange operator not found */
13223 for (o = expr; *p && *o == *p; p++)
13230 /* skip tail uncompared token */
13233 /* skip zero delim */
13238 /* post grammar: a++ reduce to num */
13239 if (lasttok == TOK_POST_INC || lasttok == TOK_POST_DEC)
13242 /* Plus and minus are binary (not unary) _only_ if the last
13243 * token was as number, or a right paren (which pretends to be
13244 * a number, since it evaluates to one). Think about it.
13245 * It makes sense. */
13246 if (lasttok != TOK_NUM) {
13262 /* We don't want a unary operator to cause recursive descent on the
13263 * stack, because there can be many in a row and it could cause an
13264 * operator to be evaluated before its argument is pushed onto the
13265 * integer stack. */
13266 /* But for binary operators, "apply" everything on the operator
13267 * stack until we find an operator with a lesser priority than the
13268 * one we have just extracted. */
13269 /* Left paren is given the lowest priority so it will never be
13270 * "applied" in this way.
13271 * if associativity is right and priority eq, applied also skip
13274 if ((prec > 0 && prec < UNARYPREC) || prec == SPEC_PREC) {
13275 /* not left paren or unary */
13276 if (lasttok != TOK_NUM) {
13277 /* binary op must be preceded by a num */
13280 while (stackptr != stack) {
13281 if (op == TOK_RPAREN) {
13282 /* The algorithm employed here is simple: while we don't
13283 * hit an open paren nor the bottom of the stack, pop
13284 * tokens and apply them */
13285 if (stackptr[-1] == TOK_LPAREN) {
13287 /* Any operator directly after a */
13289 /* close paren should consider itself binary */
13293 operator prev_prec = PREC(stackptr[-1]);
13295 convert_prec_is_assing(prec);
13296 convert_prec_is_assing(prev_prec);
13297 if (prev_prec < prec)
13299 /* check right assoc */
13300 if (prev_prec == prec && is_right_associativity(prec))
13303 errcode = arith_apply(*--stackptr, numstack, &numstackptr);
13304 if (errcode) goto ret;
13306 if (op == TOK_RPAREN) {
13311 /* Push this operator to the stack and remember it. */
13312 *stackptr++ = lasttok = op;
13317 #endif /* ASH_MATH_SUPPORT */
13320 /* ============ main() and helpers */
13323 * Called to exit the shell.
13325 static void exitshell(void) NORETURN;
13333 status = exitstatus;
13334 TRACE(("pid %d, exitshell(%d)\n", getpid(), status));
13335 if (setjmp(loc.loc)) {
13336 if (exception == EXEXIT)
13337 /* dash bug: it just does _exit(exitstatus) here
13338 * but we have to do setjobctl(0) first!
13339 * (bug is still not fixed in dash-0.5.3 - if you run dash
13340 * under Midnight Commander, on exit from dash MC is backgrounded) */
13341 status = exitstatus;
13344 exception_handler = &loc;
13350 flush_stdout_stderr();
13360 /* from input.c: */
13361 basepf.nextc = basepf.buf = basebuf;
13364 signal(SIGCHLD, SIG_DFL);
13369 char ppid[sizeof(int)*3 + 1];
13371 struct stat st1, st2;
13374 for (envp = environ; envp && *envp; envp++) {
13375 if (strchr(*envp, '=')) {
13376 setvareq(*envp, VEXPORT|VTEXTFIXED);
13380 snprintf(ppid, sizeof(ppid), "%u", (unsigned) getppid());
13381 setvar("PPID", ppid, 0);
13383 p = lookupvar("PWD");
13385 if (*p != '/' || stat(p, &st1) || stat(".", &st2)
13386 || st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino)
13393 * Process the shell command line arguments.
13396 procargs(char **argv)
13399 const char *xminusc;
13404 /* if (xargv[0]) - mmm, this is always true! */
13406 for (i = 0; i < NOPTS; i++)
13410 /* it already printed err message */
13411 raise_exception(EXERROR);
13415 if (*xargv == NULL) {
13417 ash_msg_and_raise_error(bb_msg_requires_arg, "-c");
13420 if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
13424 for (i = 0; i < NOPTS; i++)
13425 if (optlist[i] == 2)
13430 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
13435 } else if (!sflag) {
13436 setinputfile(*xargv, 0);
13439 commandname = arg0;
13442 shellparam.p = xargv;
13443 #if ENABLE_ASH_GETOPTS
13444 shellparam.optind = 1;
13445 shellparam.optoff = -1;
13447 /* assert(shellparam.malloced == 0 && shellparam.nparam == 0); */
13449 shellparam.nparam++;
13456 * Read /etc/profile or .profile.
13459 read_profile(const char *name)
13463 if (setinputfile(name, INPUT_PUSH_FILE | INPUT_NOFILE_OK) < 0)
13472 * This routine is called when an error or an interrupt occurs in an
13473 * interactive shell and control is returned to the main command loop.
13481 /* from input.c: */
13482 parselleft = parsenleft = 0; /* clear input buffer */
13484 /* from parser.c: */
13487 /* from redir.c: */
13492 static short profile_buf[16384];
13493 extern int etext();
13497 * Main routine. We initialize things, parse the arguments, execute
13498 * profiles if we're a login shell, and then call cmdloop to execute
13499 * commands. The setjmp call sets up the location to jump to when an
13500 * exception occurs. When an exception occurs the variable "state"
13501 * is used to figure out how far we had gotten.
13503 int ash_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
13504 int ash_main(int argc UNUSED_PARAM, char **argv)
13507 volatile int state;
13508 struct jmploc jmploc;
13509 struct stackmark smark;
13511 /* Initialize global data */
13515 #if ENABLE_ASH_ALIAS
13521 monitor(4, etext, profile_buf, sizeof(profile_buf), 50);
13524 #if ENABLE_FEATURE_EDITING
13525 line_input_state = new_line_input_t(FOR_SHELL | WITH_PATH_LOOKUP);
13528 if (setjmp(jmploc.loc)) {
13538 if (e == EXEXIT || s == 0 || iflag == 0 || shlvl)
13542 outcslow('\n', stderr);
13544 popstackmark(&smark);
13545 FORCE_INT_ON; /* enable interrupts */
13554 exception_handler = &jmploc;
13557 trace_puts("Shell args: ");
13558 trace_puts_args(argv);
13560 rootpid = getpid();
13562 #if ENABLE_ASH_RANDOM_SUPPORT
13563 /* Can use monotonic_ns() for better randomness but for now it is
13564 * not used anywhere else in busybox... so avoid bloat */
13565 random_galois_LFSR = random_LCG = rootpid + monotonic_us();
13568 setstackmark(&smark);
13571 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
13573 const char *hp = lookupvar("HISTFILE");
13576 hp = lookupvar("HOME");
13578 char *defhp = concat_path_file(hp, ".ash_history");
13579 setvar("HISTFILE", defhp, 0);
13585 if (argv[0] && argv[0][0] == '-')
13589 read_profile("/etc/profile");
13592 read_profile(".profile");
13598 getuid() == geteuid() && getgid() == getegid() &&
13602 shinit = lookupvar("ENV");
13603 if (shinit != NULL && *shinit != '\0') {
13604 read_profile(shinit);
13610 evalstring(minusc, 0);
13612 if (sflag || minusc == NULL) {
13613 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
13615 const char *hp = lookupvar("HISTFILE");
13618 line_input_state->hist_file = hp;
13621 state4: /* XXX ??? - why isn't this before the "if" statement */
13629 extern void _mcleanup(void);
13638 const char *applet_name = "debug stuff usage";
13639 int main(int argc, char **argv)
13641 return ash_main(argc, argv);
13647 * Copyright (c) 1989, 1991, 1993, 1994
13648 * The Regents of the University of California. All rights reserved.
13650 * This code is derived from software contributed to Berkeley by
13651 * Kenneth Almquist.
13653 * Redistribution and use in source and binary forms, with or without
13654 * modification, are permitted provided that the following conditions
13656 * 1. Redistributions of source code must retain the above copyright
13657 * notice, this list of conditions and the following disclaimer.
13658 * 2. Redistributions in binary form must reproduce the above copyright
13659 * notice, this list of conditions and the following disclaimer in the
13660 * documentation and/or other materials provided with the distribution.
13661 * 3. Neither the name of the University nor the names of its contributors
13662 * may be used to endorse or promote products derived from this software
13663 * without specific prior written permission.
13665 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
13666 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
13667 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
13668 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
13669 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
13670 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
13671 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
13672 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
13673 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
13674 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF