1 /* vi: set sw=4 ts=4: */
3 * ash shell port for busybox
5 * Copyright (c) 1989, 1991, 1993, 1994
6 * The Regents of the University of California. All rights reserved.
8 * Copyright (c) 1997-2005 Herbert Xu <herbert@gondor.apana.org.au>
9 * was re-ported from NetBSD and debianized.
12 * This code is derived from software contributed to Berkeley by
15 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
17 * Original BSD copyright notice is retained at the end of this file.
21 * rewrite arith.y to micro stack based cryptic algorithm by
22 * Copyright (c) 2001 Aaron Lehmann <aaronl@vitelus.com>
24 * Modified by Paul Mundt <lethal@linux-sh.org> (c) 2004 to support
27 * Modified by Vladimir Oleynik <dzo@simtreas.ru> (c) 2001-2005 to be
28 * used in busybox and size optimizations,
29 * rewrote arith (see notes to this), added locale support,
30 * rewrote dynamic variables.
35 * The follow should be set to reflect the type of system you have:
36 * JOBS -> 1 if you have Berkeley job control, 0 otherwise.
37 * define SYSV if you are running under System V.
38 * define DEBUG=1 to compile in debugging ('set -o debug' to turn on)
39 * define DEBUG=2 to compile in and turn on debugging.
41 * When debugging is on, debugging info will be written to ./trace and
42 * a quit signal will generate a core dump.
49 #define JOBS ENABLE_ASH_JOB_CONTROL
57 #include "busybox.h" /* for applet_names */
61 #if JOBS || ENABLE_ASH_READ_NCHARS
66 #define PIPE_BUF 4096 /* amount of buffering in a pipe */
69 #if defined(__uClinux__)
70 #error "Do not even bother, ash will not run on uClinux"
74 /* ============ Hash table sizes. Configurable. */
78 #define CMDTABLESIZE 31 /* should be prime */
81 /* ============ Misc helpers */
83 #define xbarrier() do { __asm__ __volatile__ ("": : :"memory"); } while (0)
85 /* C99 say: "char" declaration may be signed or unsigned default */
86 #define signed_char2int(sc) ((int)((signed char)sc))
89 /* ============ Shell options */
91 static const char *const optletters_optnames[] = {
112 #define optletters(n) optletters_optnames[(n)][0]
113 #define optnames(n) (&optletters_optnames[(n)][1])
115 enum { NOPTS = ARRAY_SIZE(optletters_optnames) };
118 /* ============ Misc data */
120 static const char homestr[] ALIGN1 = "HOME";
121 static const char snlfmt[] ALIGN1 = "%s\n";
122 static const char illnum[] ALIGN1 = "Illegal number: %s";
125 * We enclose jmp_buf in a structure so that we can declare pointers to
126 * jump locations. The global variable handler contains the location to
127 * jump to when an exception occurs, and the global variable exception
128 * contains a code identifying the exception. To implement nested
129 * exception handlers, the user should save the value of handler on entry
130 * to an inner scope, set handler to point to a jmploc structure for the
131 * inner scope, and restore handler on exit from the scope.
137 struct globals_misc {
138 /* pid of main shell */
140 /* shell level: 0 for the main shell, 1 for its children, and so on */
142 #define rootshell (!shlvl)
143 char *minusc; /* argument to -c option */
145 char *curdir; // = nullstr; /* current working directory */
146 char *physdir; // = nullstr; /* physical working directory */
148 char *arg0; /* value of $0 */
150 struct jmploc *exception_handler;
152 // disabled by vda: cannot understand how it was supposed to work -
153 // cannot fix bugs. That's why you have to explain your non-trivial designs!
154 // /* do we generate EXSIG events */
155 // int exsig; /* counter */
156 volatile int suppressint; /* counter */
157 volatile /*sig_atomic_t*/ smallint intpending; /* 1 = got SIGINT */
158 /* last pending signal */
159 volatile /*sig_atomic_t*/ smallint pendingsig;
160 smallint exception; /* kind of exception (0..5) */
162 #define EXINT 0 /* SIGINT received */
163 #define EXERROR 1 /* a generic error */
164 #define EXSHELLPROC 2 /* execute a shell procedure */
165 #define EXEXEC 3 /* command execution failed */
166 #define EXEXIT 4 /* exit the shell */
167 #define EXSIG 5 /* trapped signal in wait(1) */
170 char nullstr[1]; /* zero length string */
173 #define eflag optlist[0]
174 #define fflag optlist[1]
175 #define Iflag optlist[2]
176 #define iflag optlist[3]
177 #define mflag optlist[4]
178 #define nflag optlist[5]
179 #define sflag optlist[6]
180 #define xflag optlist[7]
181 #define vflag optlist[8]
182 #define Cflag optlist[9]
183 #define aflag optlist[10]
184 #define bflag optlist[11]
185 #define uflag optlist[12]
186 #define viflag optlist[13]
188 #define nolog optlist[14]
189 #define debug optlist[15]
192 /* trap handler commands */
194 * Sigmode records the current value of the signal handlers for the various
195 * modes. A value of zero means that the current handler is not known.
196 * S_HARD_IGN indicates that the signal was ignored on entry to the shell,
198 char sigmode[NSIG - 1];
199 #define S_DFL 1 /* default signal handling (SIG_DFL) */
200 #define S_CATCH 2 /* signal is caught */
201 #define S_IGN 3 /* signal is ignored (SIG_IGN) */
202 #define S_HARD_IGN 4 /* signal is ignored permenantly */
203 #define S_RESET 5 /* temporary - to reset a hard ignored sig */
205 /* indicates specified signal received */
206 char gotsig[NSIG - 1];
209 /* Rarely referenced stuff */
210 #if ENABLE_ASH_RANDOM_SUPPORT
211 /* Random number generators */
212 int32_t random_galois_LFSR; /* Galois LFSR (fast but weak). signed! */
213 uint32_t random_LCG; /* LCG (fast but weak) */
215 pid_t backgndpid; /* pid of last background process */
216 smallint job_warning; /* user was warned about stopped jobs (can be 2, 1 or 0). */
218 extern struct globals_misc *const ash_ptr_to_globals_misc;
219 #define G_misc (*ash_ptr_to_globals_misc)
220 #define rootpid (G_misc.rootpid )
221 #define shlvl (G_misc.shlvl )
222 #define minusc (G_misc.minusc )
223 #define curdir (G_misc.curdir )
224 #define physdir (G_misc.physdir )
225 #define arg0 (G_misc.arg0 )
226 #define exception_handler (G_misc.exception_handler)
227 #define exception (G_misc.exception )
228 #define suppressint (G_misc.suppressint )
229 #define intpending (G_misc.intpending )
230 //#define exsig (G_misc.exsig )
231 #define pendingsig (G_misc.pendingsig )
232 #define isloginsh (G_misc.isloginsh )
233 #define nullstr (G_misc.nullstr )
234 #define optlist (G_misc.optlist )
235 #define sigmode (G_misc.sigmode )
236 #define gotsig (G_misc.gotsig )
237 #define trap (G_misc.trap )
238 #define random_galois_LFSR (G_misc.random_galois_LFSR)
239 #define random_LCG (G_misc.random_LCG )
240 #define backgndpid (G_misc.backgndpid )
241 #define job_warning (G_misc.job_warning)
242 #define INIT_G_misc() do { \
243 (*(struct globals_misc**)&ash_ptr_to_globals_misc) = xzalloc(sizeof(G_misc)); \
250 /* ============ Interrupts / exceptions */
253 * These macros allow the user to suspend the handling of interrupt signals
254 * over a period of time. This is similar to SIGHOLD or to sigblock, but
255 * much more efficient and portable. (But hacking the kernel is so much
256 * more fun than worrying about efficiency and portability. :-))
258 #define INT_OFF do { \
264 * Called to raise an exception. Since C doesn't include exceptions, we
265 * just do a longjmp to the exception handler. The type of exception is
266 * stored in the global variable "exception".
268 static void raise_exception(int) NORETURN;
270 raise_exception(int e)
273 if (exception_handler == NULL)
278 longjmp(exception_handler->loc, 1);
282 * Called from trap.c when a SIGINT is received. (If the user specifies
283 * that SIGINT is to be trapped or ignored using the trap builtin, then
284 * this routine is not called.) Suppressint is nonzero when interrupts
285 * are held using the INT_OFF macro. (The test for iflag is just
286 * defensive programming.)
288 static void raise_interrupt(void) NORETURN;
290 raise_interrupt(void)
295 /* Signal is not automatically unmasked after it is raised,
296 * do it ourself - unmask all signals */
297 sigprocmask_allsigs(SIG_UNBLOCK);
298 /* pendingsig = 0; - now done in onsig() */
301 if (gotsig[SIGINT - 1] && !trap[SIGINT]) {
302 if (!(rootshell && iflag)) {
303 /* Kill ourself with SIGINT */
304 signal(SIGINT, SIG_DFL);
313 #if ENABLE_ASH_OPTIMIZE_FOR_SIZE
317 if (--suppressint == 0 && intpending) {
321 #define INT_ON int_on()
329 #define FORCE_INT_ON force_int_on()
331 #define INT_ON do { \
333 if (--suppressint == 0 && intpending) \
336 #define FORCE_INT_ON do { \
342 #endif /* ASH_OPTIMIZE_FOR_SIZE */
344 #define SAVE_INT(v) ((v) = suppressint)
346 #define RESTORE_INT(v) do { \
349 if (suppressint == 0 && intpending) \
354 * Ignore a signal. Only one usage site - in forkchild()
359 if (sigmode[signo - 1] != S_IGN && sigmode[signo - 1] != S_HARD_IGN) {
360 signal(signo, SIG_IGN);
362 sigmode[signo - 1] = S_HARD_IGN;
366 * Signal handler. Only one usage site - in setsignal()
371 gotsig[signo - 1] = 1;
374 if (/* exsig || */ (signo == SIGINT && !trap[SIGINT])) {
377 raise_interrupt(); /* does not return */
384 /* ============ Stdout/stderr output */
387 outstr(const char *p, FILE *file)
395 flush_stdout_stderr(void)
412 outcslow(int c, FILE *dest)
420 static int out1fmt(const char *, ...) __attribute__((__format__(__printf__,1,2)));
422 out1fmt(const char *fmt, ...)
429 r = vprintf(fmt, ap);
435 static int fmtstr(char *, size_t, const char *, ...) __attribute__((__format__(__printf__,3,4)));
437 fmtstr(char *outbuf, size_t length, const char *fmt, ...)
444 ret = vsnprintf(outbuf, length, fmt, ap);
451 out1str(const char *p)
457 out2str(const char *p)
464 /* ============ Parser structures */
466 /* control characters in argument strings */
467 #define CTLESC '\201' /* escape next character */
468 #define CTLVAR '\202' /* variable defn */
469 #define CTLENDVAR '\203'
470 #define CTLBACKQ '\204'
471 #define CTLQUOTE 01 /* ored with CTLBACKQ code if in quotes */
472 /* CTLBACKQ | CTLQUOTE == '\205' */
473 #define CTLARI '\206' /* arithmetic expression */
474 #define CTLENDARI '\207'
475 #define CTLQUOTEMARK '\210'
477 /* variable substitution byte (follows CTLVAR) */
478 #define VSTYPE 0x0f /* type of variable substitution */
479 #define VSNUL 0x10 /* colon--treat the empty string as unset */
480 #define VSQUOTE 0x80 /* inside double quotes--suppress splitting */
482 /* values of VSTYPE field */
483 #define VSNORMAL 0x1 /* normal variable: $var or ${var} */
484 #define VSMINUS 0x2 /* ${var-text} */
485 #define VSPLUS 0x3 /* ${var+text} */
486 #define VSQUESTION 0x4 /* ${var?message} */
487 #define VSASSIGN 0x5 /* ${var=text} */
488 #define VSTRIMRIGHT 0x6 /* ${var%pattern} */
489 #define VSTRIMRIGHTMAX 0x7 /* ${var%%pattern} */
490 #define VSTRIMLEFT 0x8 /* ${var#pattern} */
491 #define VSTRIMLEFTMAX 0x9 /* ${var##pattern} */
492 #define VSLENGTH 0xa /* ${#var} */
493 #if ENABLE_ASH_BASH_COMPAT
494 #define VSSUBSTR 0xc /* ${var:position:length} */
495 #define VSREPLACE 0xd /* ${var/pattern/replacement} */
496 #define VSREPLACEALL 0xe /* ${var//pattern/replacement} */
499 static const char dolatstr[] ALIGN1 = {
500 CTLVAR, VSNORMAL|VSQUOTE, '@', '=', '\0'
533 smallint type; /* Nxxxx */
536 union node *redirect;
541 smallint pipe_backgnd;
542 struct nodelist *cmdlist;
548 union node *redirect;
561 union node *elsepart;
588 struct nodelist *backquote;
601 union node *next; /* must match nfile's layout */
602 int fd; /* must match nfile's layout */
623 struct nredir nredir;
624 struct nbinary nbinary;
628 struct nclist nclist;
637 struct nodelist *next;
650 freefunc(struct funcnode *f)
652 if (f && --f->count < 0)
657 /* ============ Debugging output */
661 static FILE *tracefile;
664 trace_printf(const char *fmt, ...)
671 vfprintf(tracefile, fmt, va);
676 trace_vprintf(const char *fmt, va_list va)
680 vfprintf(tracefile, fmt, va);
684 trace_puts(const char *s)
692 trace_puts_quoted(char *s)
699 putc('"', tracefile);
700 for (p = s; *p; p++) {
702 case '\n': c = 'n'; goto backslash;
703 case '\t': c = 't'; goto backslash;
704 case '\r': c = 'r'; goto backslash;
705 case '"': c = '"'; goto backslash;
706 case '\\': c = '\\'; goto backslash;
707 case CTLESC: c = 'e'; goto backslash;
708 case CTLVAR: c = 'v'; goto backslash;
709 case CTLVAR+CTLQUOTE: c = 'V'; goto backslash;
710 case CTLBACKQ: c = 'q'; goto backslash;
711 case CTLBACKQ+CTLQUOTE: c = 'Q'; goto backslash;
713 putc('\\', tracefile);
717 if (*p >= ' ' && *p <= '~')
720 putc('\\', tracefile);
721 putc(*p >> 6 & 03, tracefile);
722 putc(*p >> 3 & 07, tracefile);
723 putc(*p & 07, tracefile);
728 putc('"', tracefile);
732 trace_puts_args(char **ap)
739 trace_puts_quoted(*ap);
741 putc('\n', tracefile);
744 putc(' ', tracefile);
759 /* leave open because libedit might be using it */
762 strcpy(s, "./trace");
764 if (!freopen(s, "a", tracefile)) {
765 fprintf(stderr, "Can't re-open %s\n", s);
770 tracefile = fopen(s, "a");
771 if (tracefile == NULL) {
772 fprintf(stderr, "Can't open %s\n", s);
778 flags = fcntl(fileno(tracefile), F_GETFL);
780 fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND);
782 setlinebuf(tracefile);
783 fputs("\nTracing started.\n", tracefile);
787 indent(int amount, char *pfx, FILE *fp)
791 for (i = 0; i < amount; i++) {
792 if (pfx && i == amount - 1)
798 /* little circular references here... */
799 static void shtree(union node *n, int ind, char *pfx, FILE *fp);
802 sharg(union node *arg, FILE *fp)
805 struct nodelist *bqlist;
808 if (arg->type != NARG) {
809 out1fmt("<node type %d>\n", arg->type);
812 bqlist = arg->narg.backquote;
813 for (p = arg->narg.text; *p; p++) {
822 if (subtype == VSLENGTH)
831 switch (subtype & VSTYPE) {
864 out1fmt("<subtype %d>", subtype);
871 case CTLBACKQ|CTLQUOTE:
874 shtree(bqlist->n, -1, NULL, fp);
885 shcmd(union node *cmd, FILE *fp)
893 for (np = cmd->ncmd.args; np; np = np->narg.next) {
899 for (np = cmd->ncmd.redirect; np; np = np->nfile.next) {
903 switch (np->nfile.type) {
904 case NTO: s = ">>"+1; dftfd = 1; break;
905 case NCLOBBER: s = ">|"; dftfd = 1; break;
906 case NAPPEND: s = ">>"; dftfd = 1; break;
907 case NTOFD: s = ">&"; dftfd = 1; break;
908 case NFROM: s = "<"; break;
909 case NFROMFD: s = "<&"; break;
910 case NFROMTO: s = "<>"; break;
911 default: s = "*error*"; break;
913 if (np->nfile.fd != dftfd)
914 fprintf(fp, "%d", np->nfile.fd);
916 if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) {
917 fprintf(fp, "%d", np->ndup.dupfd);
919 sharg(np->nfile.fname, fp);
926 shtree(union node *n, int ind, char *pfx, FILE *fp)
934 indent(ind, pfx, fp);
945 shtree(n->nbinary.ch1, ind, NULL, fp);
948 shtree(n->nbinary.ch2, ind, NULL, fp);
956 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
961 if (n->npipe.pipe_backgnd)
967 fprintf(fp, "<node type %d>", n->type);
975 showtree(union node *n)
977 trace_puts("showtree called\n");
978 shtree(n, 1, NULL, stdout);
981 #define TRACE(param) trace_printf param
982 #define TRACEV(param) trace_vprintf param
987 #define TRACEV(param)
992 /* ============ Parser data */
995 * ash_vmsg() needs parsefile->fd, hence parsefile definition is moved up.
998 struct strlist *next;
1005 struct strpush *prev; /* preceding string on stack */
1008 #if ENABLE_ASH_ALIAS
1009 struct alias *ap; /* if push was associated with an alias */
1011 char *string; /* remember the string since it may change */
1015 struct parsefile *prev; /* preceding file on stack */
1016 int linno; /* current line */
1017 int fd; /* file descriptor (or -1 if string) */
1018 int nleft; /* number of chars left in this line */
1019 int lleft; /* number of chars left in this buffer */
1020 char *nextc; /* next char in buffer */
1021 char *buf; /* input buffer */
1022 struct strpush *strpush; /* for pushing strings at this level */
1023 struct strpush basestrpush; /* so pushing one is fast */
1026 static struct parsefile basepf; /* top level input file */
1027 static struct parsefile *g_parsefile = &basepf; /* current input file */
1028 static int startlinno; /* line # where last token started */
1029 static char *commandname; /* currently executing command */
1030 static struct strlist *cmdenviron; /* environment for builtin command */
1031 static uint8_t exitstatus; /* exit status of last command */
1034 /* ============ Message printing */
1037 ash_vmsg(const char *msg, va_list ap)
1039 fprintf(stderr, "%s: ", arg0);
1041 if (strcmp(arg0, commandname))
1042 fprintf(stderr, "%s: ", commandname);
1043 if (!iflag || g_parsefile->fd)
1044 fprintf(stderr, "line %d: ", startlinno);
1046 vfprintf(stderr, msg, ap);
1047 outcslow('\n', stderr);
1051 * Exverror is called to raise the error exception. If the second argument
1052 * is not NULL then error prints an error message using printf style
1053 * formatting. It then raises the error exception.
1055 static void ash_vmsg_and_raise(int, const char *, va_list) NORETURN;
1057 ash_vmsg_and_raise(int cond, const char *msg, va_list ap)
1061 TRACE(("ash_vmsg_and_raise(%d, \"", cond));
1063 TRACE(("\") pid=%d\n", getpid()));
1065 TRACE(("ash_vmsg_and_raise(%d, NULL) pid=%d\n", cond, getpid()));
1070 flush_stdout_stderr();
1071 raise_exception(cond);
1075 static void ash_msg_and_raise_error(const char *, ...) NORETURN;
1077 ash_msg_and_raise_error(const char *msg, ...)
1082 ash_vmsg_and_raise(EXERROR, msg, ap);
1087 static void ash_msg_and_raise(int, const char *, ...) NORETURN;
1089 ash_msg_and_raise(int cond, const char *msg, ...)
1094 ash_vmsg_and_raise(cond, msg, ap);
1100 * error/warning routines for external builtins
1103 ash_msg(const char *fmt, ...)
1113 * Return a string describing an error. The returned string may be a
1114 * pointer to a static buffer that will be overwritten on the next call.
1115 * Action describes the operation that got the error.
1118 errmsg(int e, const char *em)
1120 if (e == ENOENT || e == ENOTDIR) {
1127 /* ============ Memory allocation */
1130 * It appears that grabstackstr() will barf with such alignments
1131 * because stalloc() will return a string allocated in a new stackblock.
1133 #define SHELL_ALIGN(nbytes) (((nbytes) + SHELL_SIZE) & ~SHELL_SIZE)
1135 /* Most machines require the value returned from malloc to be aligned
1136 * in some way. The following macro will get this right
1137 * on many machines. */
1138 SHELL_SIZE = sizeof(union {int i; char *cp; double d; }) - 1,
1139 /* Minimum size of a block */
1140 MINSIZE = SHELL_ALIGN(504),
1143 struct stack_block {
1144 struct stack_block *prev;
1145 char space[MINSIZE];
1149 struct stack_block *stackp;
1152 struct stackmark *marknext;
1156 struct globals_memstack {
1157 struct stack_block *g_stackp; // = &stackbase;
1158 struct stackmark *markp;
1159 char *g_stacknxt; // = stackbase.space;
1160 char *sstrend; // = stackbase.space + MINSIZE;
1161 size_t g_stacknleft; // = MINSIZE;
1162 int herefd; // = -1;
1163 struct stack_block stackbase;
1165 extern struct globals_memstack *const ash_ptr_to_globals_memstack;
1166 #define G_memstack (*ash_ptr_to_globals_memstack)
1167 #define g_stackp (G_memstack.g_stackp )
1168 #define markp (G_memstack.markp )
1169 #define g_stacknxt (G_memstack.g_stacknxt )
1170 #define sstrend (G_memstack.sstrend )
1171 #define g_stacknleft (G_memstack.g_stacknleft)
1172 #define herefd (G_memstack.herefd )
1173 #define stackbase (G_memstack.stackbase )
1174 #define INIT_G_memstack() do { \
1175 (*(struct globals_memstack**)&ash_ptr_to_globals_memstack) = xzalloc(sizeof(G_memstack)); \
1177 g_stackp = &stackbase; \
1178 g_stacknxt = stackbase.space; \
1179 g_stacknleft = MINSIZE; \
1180 sstrend = stackbase.space + MINSIZE; \
1184 #define stackblock() ((void *)g_stacknxt)
1185 #define stackblocksize() g_stacknleft
1189 ckrealloc(void * p, size_t nbytes)
1191 p = realloc(p, nbytes);
1193 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1198 ckmalloc(size_t nbytes)
1200 return ckrealloc(NULL, nbytes);
1204 ckzalloc(size_t nbytes)
1206 return memset(ckmalloc(nbytes), 0, nbytes);
1210 * Make a copy of a string in safe storage.
1213 ckstrdup(const char *s)
1215 char *p = strdup(s);
1217 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1222 * Parse trees for commands are allocated in lifo order, so we use a stack
1223 * to make this more efficient, and also to avoid all sorts of exception
1224 * handling code to handle interrupts in the middle of a parse.
1226 * The size 504 was chosen because the Ultrix malloc handles that size
1230 stalloc(size_t nbytes)
1235 aligned = SHELL_ALIGN(nbytes);
1236 if (aligned > g_stacknleft) {
1239 struct stack_block *sp;
1241 blocksize = aligned;
1242 if (blocksize < MINSIZE)
1243 blocksize = MINSIZE;
1244 len = sizeof(struct stack_block) - MINSIZE + blocksize;
1245 if (len < blocksize)
1246 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1249 sp->prev = g_stackp;
1250 g_stacknxt = sp->space;
1251 g_stacknleft = blocksize;
1252 sstrend = g_stacknxt + blocksize;
1257 g_stacknxt += aligned;
1258 g_stacknleft -= aligned;
1263 stzalloc(size_t nbytes)
1265 return memset(stalloc(nbytes), 0, nbytes);
1272 if (!p || (g_stacknxt < (char *)p) || ((char *)p < g_stackp->space)) {
1273 write(STDERR_FILENO, "stunalloc\n", 10);
1277 g_stacknleft += g_stacknxt - (char *)p;
1282 * Like strdup but works with the ash stack.
1285 ststrdup(const char *p)
1287 size_t len = strlen(p) + 1;
1288 return memcpy(stalloc(len), p, len);
1292 setstackmark(struct stackmark *mark)
1294 mark->stackp = g_stackp;
1295 mark->stacknxt = g_stacknxt;
1296 mark->stacknleft = g_stacknleft;
1297 mark->marknext = markp;
1302 popstackmark(struct stackmark *mark)
1304 struct stack_block *sp;
1310 markp = mark->marknext;
1311 while (g_stackp != mark->stackp) {
1313 g_stackp = sp->prev;
1316 g_stacknxt = mark->stacknxt;
1317 g_stacknleft = mark->stacknleft;
1318 sstrend = mark->stacknxt + mark->stacknleft;
1323 * When the parser reads in a string, it wants to stick the string on the
1324 * stack and only adjust the stack pointer when it knows how big the
1325 * string is. Stackblock (defined in stack.h) returns a pointer to a block
1326 * of space on top of the stack and stackblocklen returns the length of
1327 * this block. Growstackblock will grow this space by at least one byte,
1328 * possibly moving it (like realloc). Grabstackblock actually allocates the
1329 * part of the block that has been used.
1332 growstackblock(void)
1336 newlen = g_stacknleft * 2;
1337 if (newlen < g_stacknleft)
1338 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1342 if (g_stacknxt == g_stackp->space && g_stackp != &stackbase) {
1343 struct stack_block *oldstackp;
1344 struct stackmark *xmark;
1345 struct stack_block *sp;
1346 struct stack_block *prevstackp;
1350 oldstackp = g_stackp;
1352 prevstackp = sp->prev;
1353 grosslen = newlen + sizeof(struct stack_block) - MINSIZE;
1354 sp = ckrealloc(sp, grosslen);
1355 sp->prev = prevstackp;
1357 g_stacknxt = sp->space;
1358 g_stacknleft = newlen;
1359 sstrend = sp->space + newlen;
1362 * Stack marks pointing to the start of the old block
1363 * must be relocated to point to the new block
1366 while (xmark != NULL && xmark->stackp == oldstackp) {
1367 xmark->stackp = g_stackp;
1368 xmark->stacknxt = g_stacknxt;
1369 xmark->stacknleft = g_stacknleft;
1370 xmark = xmark->marknext;
1374 char *oldspace = g_stacknxt;
1375 size_t oldlen = g_stacknleft;
1376 char *p = stalloc(newlen);
1378 /* free the space we just allocated */
1379 g_stacknxt = memcpy(p, oldspace, oldlen);
1380 g_stacknleft += newlen;
1385 grabstackblock(size_t len)
1387 len = SHELL_ALIGN(len);
1389 g_stacknleft -= len;
1393 * The following routines are somewhat easier to use than the above.
1394 * The user declares a variable of type STACKSTR, which may be declared
1395 * to be a register. The macro STARTSTACKSTR initializes things. Then
1396 * the user uses the macro STPUTC to add characters to the string. In
1397 * effect, STPUTC(c, p) is the same as *p++ = c except that the stack is
1398 * grown as necessary. When the user is done, she can just leave the
1399 * string there and refer to it using stackblock(). Or she can allocate
1400 * the space for it using grabstackstr(). If it is necessary to allow
1401 * someone else to use the stack temporarily and then continue to grow
1402 * the string, the user should use grabstack to allocate the space, and
1403 * then call ungrabstr(p) to return to the previous mode of operation.
1405 * USTPUTC is like STPUTC except that it doesn't check for overflow.
1406 * CHECKSTACKSPACE can be called before USTPUTC to ensure that there
1407 * is space for at least one character.
1412 size_t len = stackblocksize();
1413 if (herefd >= 0 && len >= 1024) {
1414 full_write(herefd, stackblock(), len);
1415 return stackblock();
1418 return (char *)stackblock() + len;
1422 * Called from CHECKSTRSPACE.
1425 makestrspace(size_t newlen, char *p)
1427 size_t len = p - g_stacknxt;
1428 size_t size = stackblocksize();
1433 size = stackblocksize();
1435 if (nleft >= newlen)
1439 return (char *)stackblock() + len;
1443 stack_nputstr(const char *s, size_t n, char *p)
1445 p = makestrspace(n, p);
1446 p = (char *)memcpy(p, s, n) + n;
1451 stack_putstr(const char *s, char *p)
1453 return stack_nputstr(s, strlen(s), p);
1457 _STPUTC(int c, char *p)
1465 #define STARTSTACKSTR(p) ((p) = stackblock())
1466 #define STPUTC(c, p) ((p) = _STPUTC((c), (p)))
1467 #define CHECKSTRSPACE(n, p) do { \
1470 size_t m = sstrend - q; \
1472 (p) = makestrspace(l, q); \
1474 #define USTPUTC(c, p) (*(p)++ = (c))
1475 #define STACKSTRNUL(p) do { \
1476 if ((p) == sstrend) \
1477 (p) = growstackstr(); \
1480 #define STUNPUTC(p) (--(p))
1481 #define STTOPC(p) ((p)[-1])
1482 #define STADJUST(amount, p) ((p) += (amount))
1484 #define grabstackstr(p) stalloc((char *)(p) - (char *)stackblock())
1485 #define ungrabstackstr(s, p) stunalloc(s)
1486 #define stackstrend() ((void *)sstrend)
1489 /* ============ String helpers */
1492 * prefix -- see if pfx is a prefix of string.
1495 prefix(const char *string, const char *pfx)
1498 if (*pfx++ != *string++)
1501 return (char *) string;
1505 * Check for a valid number. This should be elsewhere.
1508 is_number(const char *p)
1513 } while (*++p != '\0');
1518 * Convert a string of digits to an integer, printing an error message on
1522 number(const char *s)
1525 ash_msg_and_raise_error(illnum, s);
1530 * Produce a possibly single quoted string suitable as input to the shell.
1531 * The return string is allocated on the stack.
1534 single_quote(const char *s)
1544 len = strchrnul(s, '\'') - s;
1546 q = p = makestrspace(len + 3, p);
1549 q = (char *)memcpy(q, s, len) + len;
1555 len = strspn(s, "'");
1559 q = p = makestrspace(len + 3, p);
1562 q = (char *)memcpy(q, s, len) + len;
1571 return stackblock();
1575 /* ============ nextopt */
1577 static char **argptr; /* argument list for builtin commands */
1578 static char *optionarg; /* set by nextopt (like getopt) */
1579 static char *optptr; /* used by nextopt */
1582 * XXX - should get rid of. Have all builtins use getopt(3).
1583 * The library getopt must have the BSD extension static variable
1584 * "optreset", otherwise it can't be used within the shell safely.
1586 * Standard option processing (a la getopt) for builtin routines.
1587 * The only argument that is passed to nextopt is the option string;
1588 * the other arguments are unnecessary. It returns the character,
1589 * or '\0' on end of input.
1592 nextopt(const char *optstring)
1599 if (p == NULL || *p == '\0') {
1600 /* We ate entire "-param", take next one */
1606 if (*++p == '\0') /* just "-" ? */
1609 if (LONE_DASH(p)) /* "--" ? */
1611 /* p => next "-param" */
1613 /* p => some option char in the middle of a "-param" */
1615 for (q = optstring; *q != c;) {
1617 ash_msg_and_raise_error("illegal option -%c", c);
1625 ash_msg_and_raise_error("no arg for -%c option", c);
1635 /* ============ Shell variables */
1638 * The parsefile structure pointed to by the global variable parsefile
1639 * contains information about the current file being read.
1642 int nparam; /* # of positional parameters (without $0) */
1643 #if ENABLE_ASH_GETOPTS
1644 int optind; /* next parameter to be processed by getopts */
1645 int optoff; /* used by getopts */
1647 unsigned char malloced; /* if parameter list dynamically allocated */
1648 char **p; /* parameter list */
1652 * Free the list of positional parameters.
1655 freeparam(volatile struct shparam *param)
1657 if (param->malloced) {
1659 ap = ap1 = param->p;
1666 #if ENABLE_ASH_GETOPTS
1667 static void getoptsreset(const char *value);
1671 struct var *next; /* next entry in hash list */
1672 int flags; /* flags are defined above */
1673 const char *text; /* name=value */
1674 void (*func)(const char *); /* function to be called when */
1675 /* the variable gets set/unset */
1679 struct localvar *next; /* next local variable in list */
1680 struct var *vp; /* the variable that was made local */
1681 int flags; /* saved flags */
1682 const char *text; /* saved text */
1686 #define VEXPORT 0x01 /* variable is exported */
1687 #define VREADONLY 0x02 /* variable cannot be modified */
1688 #define VSTRFIXED 0x04 /* variable struct is statically allocated */
1689 #define VTEXTFIXED 0x08 /* text is statically allocated */
1690 #define VSTACK 0x10 /* text is allocated on the stack */
1691 #define VUNSET 0x20 /* the variable is not set */
1692 #define VNOFUNC 0x40 /* don't call the callback function */
1693 #define VNOSET 0x80 /* do not set variable - just readonly test */
1694 #define VNOSAVE 0x100 /* when text is on the heap before setvareq */
1695 #if ENABLE_ASH_RANDOM_SUPPORT
1696 # define VDYNAMIC 0x200 /* dynamic variable */
1702 static const char defifsvar[] ALIGN1 = "IFS= \t\n";
1703 #define defifs (defifsvar + 4)
1705 static const char defifs[] ALIGN1 = " \t\n";
1709 /* Need to be before varinit_data[] */
1710 #if ENABLE_LOCALE_SUPPORT
1712 change_lc_all(const char *value)
1714 if (value && *value != '\0')
1715 setlocale(LC_ALL, value);
1718 change_lc_ctype(const char *value)
1720 if (value && *value != '\0')
1721 setlocale(LC_CTYPE, value);
1725 static void chkmail(void);
1726 static void changemail(const char *);
1728 static void changepath(const char *);
1729 #if ENABLE_ASH_RANDOM_SUPPORT
1730 static void change_random(const char *);
1733 static const struct {
1736 void (*func)(const char *);
1737 } varinit_data[] = {
1739 { VSTRFIXED|VTEXTFIXED , defifsvar , NULL },
1741 { VSTRFIXED|VTEXTFIXED|VUNSET, "IFS\0" , NULL },
1744 { VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL\0" , changemail },
1745 { VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH\0", changemail },
1747 { VSTRFIXED|VTEXTFIXED , bb_PATH_root_path, changepath },
1748 { VSTRFIXED|VTEXTFIXED , "PS1=$ " , NULL },
1749 { VSTRFIXED|VTEXTFIXED , "PS2=> " , NULL },
1750 { VSTRFIXED|VTEXTFIXED , "PS4=+ " , NULL },
1751 #if ENABLE_ASH_GETOPTS
1752 { VSTRFIXED|VTEXTFIXED , "OPTIND=1" , getoptsreset },
1754 #if ENABLE_ASH_RANDOM_SUPPORT
1755 { VSTRFIXED|VTEXTFIXED|VUNSET|VDYNAMIC, "RANDOM\0", change_random },
1757 #if ENABLE_LOCALE_SUPPORT
1758 { VSTRFIXED|VTEXTFIXED|VUNSET, "LC_ALL\0" , change_lc_all },
1759 { VSTRFIXED|VTEXTFIXED|VUNSET, "LC_CTYPE\0", change_lc_ctype },
1761 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
1762 { VSTRFIXED|VTEXTFIXED|VUNSET, "HISTFILE\0", NULL },
1768 struct globals_var {
1769 struct shparam shellparam; /* $@ current positional parameters */
1770 struct redirtab *redirlist;
1772 int preverrout_fd; /* save fd2 before print debug if xflag is set. */
1773 struct var *vartab[VTABSIZE];
1774 struct var varinit[ARRAY_SIZE(varinit_data)];
1776 extern struct globals_var *const ash_ptr_to_globals_var;
1777 #define G_var (*ash_ptr_to_globals_var)
1778 #define shellparam (G_var.shellparam )
1779 //#define redirlist (G_var.redirlist )
1780 #define g_nullredirs (G_var.g_nullredirs )
1781 #define preverrout_fd (G_var.preverrout_fd)
1782 #define vartab (G_var.vartab )
1783 #define varinit (G_var.varinit )
1784 #define INIT_G_var() do { \
1786 (*(struct globals_var**)&ash_ptr_to_globals_var) = xzalloc(sizeof(G_var)); \
1788 for (i = 0; i < ARRAY_SIZE(varinit_data); i++) { \
1789 varinit[i].flags = varinit_data[i].flags; \
1790 varinit[i].text = varinit_data[i].text; \
1791 varinit[i].func = varinit_data[i].func; \
1795 #define vifs varinit[0]
1797 # define vmail (&vifs)[1]
1798 # define vmpath (&vmail)[1]
1799 # define vpath (&vmpath)[1]
1801 # define vpath (&vifs)[1]
1803 #define vps1 (&vpath)[1]
1804 #define vps2 (&vps1)[1]
1805 #define vps4 (&vps2)[1]
1806 #if ENABLE_ASH_GETOPTS
1807 # define voptind (&vps4)[1]
1808 # if ENABLE_ASH_RANDOM_SUPPORT
1809 # define vrandom (&voptind)[1]
1812 # if ENABLE_ASH_RANDOM_SUPPORT
1813 # define vrandom (&vps4)[1]
1818 * The following macros access the values of the above variables.
1819 * They have to skip over the name. They return the null string
1820 * for unset variables.
1822 #define ifsval() (vifs.text + 4)
1823 #define ifsset() ((vifs.flags & VUNSET) == 0)
1825 # define mailval() (vmail.text + 5)
1826 # define mpathval() (vmpath.text + 9)
1827 # define mpathset() ((vmpath.flags & VUNSET) == 0)
1829 #define pathval() (vpath.text + 5)
1830 #define ps1val() (vps1.text + 4)
1831 #define ps2val() (vps2.text + 4)
1832 #define ps4val() (vps4.text + 4)
1833 #if ENABLE_ASH_GETOPTS
1834 # define optindval() (voptind.text + 7)
1838 #define is_name(c) ((c) == '_' || isalpha((unsigned char)(c)))
1839 #define is_in_name(c) ((c) == '_' || isalnum((unsigned char)(c)))
1841 #if ENABLE_ASH_GETOPTS
1843 getoptsreset(const char *value)
1845 shellparam.optind = number(value);
1846 shellparam.optoff = -1;
1851 * Return of a legal variable name (a letter or underscore followed by zero or
1852 * more letters, underscores, and digits).
1855 endofname(const char *name)
1863 if (!is_in_name(*p))
1870 * Compares two strings up to the first = or '\0'. The first
1871 * string must be terminated by '='; the second may be terminated by
1872 * either '=' or '\0'.
1875 varcmp(const char *p, const char *q)
1879 while ((c = *p) == (d = *q)) {
1894 varequal(const char *a, const char *b)
1896 return !varcmp(a, b);
1900 * Find the appropriate entry in the hash table from the name.
1902 static struct var **
1903 hashvar(const char *p)
1907 hashval = ((unsigned char) *p) << 4;
1908 while (*p && *p != '=')
1909 hashval += (unsigned char) *p++;
1910 return &vartab[hashval % VTABSIZE];
1914 vpcmp(const void *a, const void *b)
1916 return varcmp(*(const char **)a, *(const char **)b);
1920 * This routine initializes the builtin variables.
1930 * PS1 depends on uid
1932 #if ENABLE_FEATURE_EDITING && ENABLE_FEATURE_EDITING_FANCY_PROMPT
1933 vps1.text = "PS1=\\w \\$ ";
1936 vps1.text = "PS1=# ";
1939 end = vp + ARRAY_SIZE(varinit);
1941 vpp = hashvar(vp->text);
1944 } while (++vp < end);
1947 static struct var **
1948 findvar(struct var **vpp, const char *name)
1950 for (; *vpp; vpp = &(*vpp)->next) {
1951 if (varequal((*vpp)->text, name)) {
1959 * Find the value of a variable. Returns NULL if not set.
1962 lookupvar(const char *name)
1966 v = *findvar(hashvar(name), name);
1968 #if ENABLE_ASH_RANDOM_SUPPORT
1970 * Dynamic variables are implemented roughly the same way they are
1971 * in bash. Namely, they're "special" so long as they aren't unset.
1972 * As soon as they're unset, they're no longer dynamic, and dynamic
1973 * lookup will no longer happen at that point. -- PFM.
1975 if ((v->flags & VDYNAMIC))
1978 if (!(v->flags & VUNSET))
1979 return strchrnul(v->text, '=') + 1;
1985 * Search the environment of a builtin command.
1988 bltinlookup(const char *name)
1992 for (sp = cmdenviron; sp; sp = sp->next) {
1993 if (varequal(sp->text, name))
1994 return strchrnul(sp->text, '=') + 1;
1996 return lookupvar(name);
2000 * Same as setvar except that the variable and value are passed in
2001 * the first argument as name=value. Since the first argument will
2002 * be actually stored in the table, it should not be a string that
2004 * Called with interrupts off.
2007 setvareq(char *s, int flags)
2009 struct var *vp, **vpp;
2012 flags |= (VEXPORT & (((unsigned) (1 - aflag)) - 1));
2013 vp = *findvar(vpp, s);
2015 if ((vp->flags & (VREADONLY|VDYNAMIC)) == VREADONLY) {
2018 if (flags & VNOSAVE)
2021 ash_msg_and_raise_error("%.*s: is read only", strchrnul(n, '=') - n, n);
2027 if (vp->func && (flags & VNOFUNC) == 0)
2028 (*vp->func)(strchrnul(s, '=') + 1);
2030 if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
2031 free((char*)vp->text);
2033 flags |= vp->flags & ~(VTEXTFIXED|VSTACK|VNOSAVE|VUNSET);
2038 vp = ckzalloc(sizeof(*vp));
2040 /*vp->func = NULL; - ckzalloc did it */
2043 if (!(flags & (VTEXTFIXED|VSTACK|VNOSAVE)))
2050 * Set the value of a variable. The flags argument is ored with the
2051 * flags of the variable. If val is NULL, the variable is unset.
2054 setvar(const char *name, const char *val, int flags)
2061 q = endofname(name);
2062 p = strchrnul(q, '=');
2064 if (!namelen || p != q)
2065 ash_msg_and_raise_error("%.*s: bad variable name", namelen, name);
2070 vallen = strlen(val);
2073 nameeq = ckmalloc(namelen + vallen + 2);
2074 p = (char *)memcpy(nameeq, name, namelen) + namelen;
2077 p = (char *)memcpy(p, val, vallen) + vallen;
2080 setvareq(nameeq, flags | VNOSAVE);
2084 #if ENABLE_ASH_GETOPTS
2086 * Safe version of setvar, returns 1 on success 0 on failure.
2089 setvarsafe(const char *name, const char *val, int flags)
2092 volatile int saveint;
2093 struct jmploc *volatile savehandler = exception_handler;
2094 struct jmploc jmploc;
2097 if (setjmp(jmploc.loc))
2100 exception_handler = &jmploc;
2101 setvar(name, val, flags);
2104 exception_handler = savehandler;
2105 RESTORE_INT(saveint);
2111 * Unset the specified variable.
2114 unsetvar(const char *s)
2120 vpp = findvar(hashvar(s), s);
2124 int flags = vp->flags;
2127 if (flags & VREADONLY)
2129 #if ENABLE_ASH_RANDOM_SUPPORT
2130 vp->flags &= ~VDYNAMIC;
2134 if ((flags & VSTRFIXED) == 0) {
2136 if ((flags & (VTEXTFIXED|VSTACK)) == 0)
2137 free((char*)vp->text);
2143 vp->flags &= ~VEXPORT;
2153 * Process a linked list of variable assignments.
2156 listsetvar(struct strlist *list_set_var, int flags)
2158 struct strlist *lp = list_set_var;
2164 setvareq(lp->text, flags);
2171 * Generate a list of variables satisfying the given conditions.
2174 listvars(int on, int off, char ***end)
2185 for (vp = *vpp; vp; vp = vp->next) {
2186 if ((vp->flags & mask) == on) {
2187 if (ep == stackstrend())
2188 ep = growstackstr();
2189 *ep++ = (char *) vp->text;
2192 } while (++vpp < vartab + VTABSIZE);
2193 if (ep == stackstrend())
2194 ep = growstackstr();
2198 return grabstackstr(ep);
2202 /* ============ Path search helper
2204 * The variable path (passed by reference) should be set to the start
2205 * of the path before the first call; padvance will update
2206 * this value as it proceeds. Successive calls to padvance will return
2207 * the possible path expansions in sequence. If an option (indicated by
2208 * a percent sign) appears in the path entry then the global variable
2209 * pathopt will be set to point to it; otherwise pathopt will be set to
2212 static const char *pathopt; /* set by padvance */
2215 padvance(const char **path, const char *name)
2225 for (p = start; *p && *p != ':' && *p != '%'; p++)
2227 len = p - start + strlen(name) + 2; /* "2" is for '/' and '\0' */
2228 while (stackblocksize() < len)
2232 memcpy(q, start, p - start);
2240 while (*p && *p != ':')
2247 return stalloc(len);
2251 /* ============ Prompt */
2253 static smallint doprompt; /* if set, prompt the user */
2254 static smallint needprompt; /* true if interactive and at start of line */
2256 #if ENABLE_FEATURE_EDITING
2257 static line_input_t *line_input_state;
2258 static const char *cmdedit_prompt;
2260 putprompt(const char *s)
2262 if (ENABLE_ASH_EXPAND_PRMT) {
2263 free((char*)cmdedit_prompt);
2264 cmdedit_prompt = ckstrdup(s);
2271 putprompt(const char *s)
2277 #if ENABLE_ASH_EXPAND_PRMT
2278 /* expandstr() needs parsing machinery, so it is far away ahead... */
2279 static const char *expandstr(const char *ps);
2281 #define expandstr(s) s
2285 setprompt(int whichprompt)
2288 #if ENABLE_ASH_EXPAND_PRMT
2289 struct stackmark smark;
2294 switch (whichprompt) {
2304 #if ENABLE_ASH_EXPAND_PRMT
2305 setstackmark(&smark);
2306 stalloc(stackblocksize());
2308 putprompt(expandstr(prompt));
2309 #if ENABLE_ASH_EXPAND_PRMT
2310 popstackmark(&smark);
2315 /* ============ The cd and pwd commands */
2317 #define CD_PHYSICAL 1
2320 static int docd(const char *, int);
2329 while ((i = nextopt("LP"))) {
2331 flags ^= CD_PHYSICAL;
2340 * Update curdir (the name of the current directory) in response to a
2344 updatepwd(const char *dir)
2351 cdcomppath = ststrdup(dir);
2354 if (curdir == nullstr)
2356 new = stack_putstr(curdir, new);
2358 new = makestrspace(strlen(dir) + 2, new);
2359 lim = (char *)stackblock() + 1;
2363 if (new > lim && *lim == '/')
2368 if (dir[1] == '/' && dir[2] != '/') {
2374 p = strtok(cdcomppath, "/");
2378 if (p[1] == '.' && p[2] == '\0') {
2390 new = stack_putstr(p, new);
2398 return stackblock();
2402 * Find out what the current directory is. If we already know the current
2403 * directory, this routine returns immediately.
2408 char *dir = getcwd(NULL, 0); /* huh, using glibc extension? */
2409 return dir ? dir : nullstr;
2413 setpwd(const char *val, int setold)
2417 oldcur = dir = curdir;
2420 setvar("OLDPWD", oldcur, VEXPORT);
2423 if (physdir != nullstr) {
2424 if (physdir != oldcur)
2428 if (oldcur == val || !val) {
2434 dir = ckstrdup(val);
2435 if (oldcur != dir && oldcur != nullstr) {
2440 setvar("PWD", dir, VEXPORT);
2443 static void hashcd(void);
2446 * Actually do the chdir. We also call hashcd to let the routines in exec.c
2447 * know that the current directory has changed.
2450 docd(const char *dest, int flags)
2452 const char *dir = 0;
2455 TRACE(("docd(\"%s\", %d) called\n", dest, flags));
2458 if (!(flags & CD_PHYSICAL)) {
2459 dir = updatepwd(dest);
2474 cdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
2486 dest = bltinlookup(homestr);
2487 else if (LONE_DASH(dest)) {
2488 dest = bltinlookup("OLDPWD");
2510 path = bltinlookup("CDPATH");
2519 p = padvance(&path, dest);
2520 if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
2524 if (!docd(p, flags))
2529 ash_msg_and_raise_error("can't cd to %s", dest);
2532 if (flags & CD_PRINT)
2533 out1fmt(snlfmt, curdir);
2538 pwdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
2541 const char *dir = curdir;
2545 if (physdir == nullstr)
2549 out1fmt(snlfmt, dir);
2554 /* ============ ... */
2556 #define IBUFSIZ COMMON_BUFSIZE
2557 #define basebuf bb_common_bufsiz1 /* buffer for top level input file */
2559 /* Syntax classes */
2560 #define CWORD 0 /* character is nothing special */
2561 #define CNL 1 /* newline character */
2562 #define CBACK 2 /* a backslash character */
2563 #define CSQUOTE 3 /* single quote */
2564 #define CDQUOTE 4 /* double quote */
2565 #define CENDQUOTE 5 /* a terminating quote */
2566 #define CBQUOTE 6 /* backwards single quote */
2567 #define CVAR 7 /* a dollar sign */
2568 #define CENDVAR 8 /* a '}' character */
2569 #define CLP 9 /* a left paren in arithmetic */
2570 #define CRP 10 /* a right paren in arithmetic */
2571 #define CENDFILE 11 /* end of file */
2572 #define CCTL 12 /* like CWORD, except it must be escaped */
2573 #define CSPCL 13 /* these terminate a word */
2574 #define CIGN 14 /* character should be ignored */
2576 #if ENABLE_ASH_ALIAS
2580 #define PEOA_OR_PEOF PEOA
2584 #define PEOA_OR_PEOF PEOF
2587 /* number syntax index */
2588 #define BASESYNTAX 0 /* not in quotes */
2589 #define DQSYNTAX 1 /* in double quotes */
2590 #define SQSYNTAX 2 /* in single quotes */
2591 #define ARISYNTAX 3 /* in arithmetic */
2592 #define PSSYNTAX 4 /* prompt */
2594 #if ENABLE_ASH_OPTIMIZE_FOR_SIZE
2595 #define USE_SIT_FUNCTION
2598 #if ENABLE_ASH_MATH_SUPPORT
2599 static const char S_I_T[][4] = {
2600 #if ENABLE_ASH_ALIAS
2601 { CSPCL, CIGN, CIGN, CIGN }, /* 0, PEOA */
2603 { CSPCL, CWORD, CWORD, CWORD }, /* 1, ' ' */
2604 { CNL, CNL, CNL, CNL }, /* 2, \n */
2605 { CWORD, CCTL, CCTL, CWORD }, /* 3, !*-/:=?[]~ */
2606 { CDQUOTE, CENDQUOTE, CWORD, CWORD }, /* 4, '"' */
2607 { CVAR, CVAR, CWORD, CVAR }, /* 5, $ */
2608 { CSQUOTE, CWORD, CENDQUOTE, CWORD }, /* 6, "'" */
2609 { CSPCL, CWORD, CWORD, CLP }, /* 7, ( */
2610 { CSPCL, CWORD, CWORD, CRP }, /* 8, ) */
2611 { CBACK, CBACK, CCTL, CBACK }, /* 9, \ */
2612 { CBQUOTE, CBQUOTE, CWORD, CBQUOTE }, /* 10, ` */
2613 { CENDVAR, CENDVAR, CWORD, CENDVAR }, /* 11, } */
2614 #ifndef USE_SIT_FUNCTION
2615 { CENDFILE, CENDFILE, CENDFILE, CENDFILE }, /* 12, PEOF */
2616 { CWORD, CWORD, CWORD, CWORD }, /* 13, 0-9A-Za-z */
2617 { CCTL, CCTL, CCTL, CCTL } /* 14, CTLESC ... */
2621 static const char S_I_T[][3] = {
2622 #if ENABLE_ASH_ALIAS
2623 { CSPCL, CIGN, CIGN }, /* 0, PEOA */
2625 { CSPCL, CWORD, CWORD }, /* 1, ' ' */
2626 { CNL, CNL, CNL }, /* 2, \n */
2627 { CWORD, CCTL, CCTL }, /* 3, !*-/:=?[]~ */
2628 { CDQUOTE, CENDQUOTE, CWORD }, /* 4, '"' */
2629 { CVAR, CVAR, CWORD }, /* 5, $ */
2630 { CSQUOTE, CWORD, CENDQUOTE }, /* 6, "'" */
2631 { CSPCL, CWORD, CWORD }, /* 7, ( */
2632 { CSPCL, CWORD, CWORD }, /* 8, ) */
2633 { CBACK, CBACK, CCTL }, /* 9, \ */
2634 { CBQUOTE, CBQUOTE, CWORD }, /* 10, ` */
2635 { CENDVAR, CENDVAR, CWORD }, /* 11, } */
2636 #ifndef USE_SIT_FUNCTION
2637 { CENDFILE, CENDFILE, CENDFILE }, /* 12, PEOF */
2638 { CWORD, CWORD, CWORD }, /* 13, 0-9A-Za-z */
2639 { CCTL, CCTL, CCTL } /* 14, CTLESC ... */
2642 #endif /* ASH_MATH_SUPPORT */
2644 #ifdef USE_SIT_FUNCTION
2647 SIT(int c, int syntax)
2649 static const char spec_symbls[] ALIGN1 = "\t\n !\"$&'()*-/:;<=>?[\\]`|}~";
2650 #if ENABLE_ASH_ALIAS
2651 static const char syntax_index_table[] ALIGN1 = {
2652 1, 2, 1, 3, 4, 5, 1, 6, /* "\t\n !\"$&'" */
2653 7, 8, 3, 3, 3, 3, 1, 1, /* "()*-/:;<" */
2654 3, 1, 3, 3, 9, 3, 10, 1, /* "=>?[\\]`|" */
2658 static const char syntax_index_table[] ALIGN1 = {
2659 0, 1, 0, 2, 3, 4, 0, 5, /* "\t\n !\"$&'" */
2660 6, 7, 2, 2, 2, 2, 0, 0, /* "()*-/:;<" */
2661 2, 0, 2, 2, 8, 2, 9, 0, /* "=>?[\\]`|" */
2668 if (c == PEOF) /* 2^8+2 */
2670 #if ENABLE_ASH_ALIAS
2671 if (c == PEOA) /* 2^8+1 */
2675 #define U_C(c) ((unsigned char)(c))
2677 if ((unsigned char)c >= (unsigned char)(CTLESC)
2678 && (unsigned char)c <= (unsigned char)(CTLQUOTEMARK)
2682 s = strchrnul(spec_symbls, c);
2685 indx = syntax_index_table[s - spec_symbls];
2687 return S_I_T[indx][syntax];
2690 #else /* !USE_SIT_FUNCTION */
2692 #if ENABLE_ASH_ALIAS
2693 #define CSPCL_CIGN_CIGN_CIGN 0
2694 #define CSPCL_CWORD_CWORD_CWORD 1
2695 #define CNL_CNL_CNL_CNL 2
2696 #define CWORD_CCTL_CCTL_CWORD 3
2697 #define CDQUOTE_CENDQUOTE_CWORD_CWORD 4
2698 #define CVAR_CVAR_CWORD_CVAR 5
2699 #define CSQUOTE_CWORD_CENDQUOTE_CWORD 6
2700 #define CSPCL_CWORD_CWORD_CLP 7
2701 #define CSPCL_CWORD_CWORD_CRP 8
2702 #define CBACK_CBACK_CCTL_CBACK 9
2703 #define CBQUOTE_CBQUOTE_CWORD_CBQUOTE 10
2704 #define CENDVAR_CENDVAR_CWORD_CENDVAR 11
2705 #define CENDFILE_CENDFILE_CENDFILE_CENDFILE 12
2706 #define CWORD_CWORD_CWORD_CWORD 13
2707 #define CCTL_CCTL_CCTL_CCTL 14
2709 #define CSPCL_CWORD_CWORD_CWORD 0
2710 #define CNL_CNL_CNL_CNL 1
2711 #define CWORD_CCTL_CCTL_CWORD 2
2712 #define CDQUOTE_CENDQUOTE_CWORD_CWORD 3
2713 #define CVAR_CVAR_CWORD_CVAR 4
2714 #define CSQUOTE_CWORD_CENDQUOTE_CWORD 5
2715 #define CSPCL_CWORD_CWORD_CLP 6
2716 #define CSPCL_CWORD_CWORD_CRP 7
2717 #define CBACK_CBACK_CCTL_CBACK 8
2718 #define CBQUOTE_CBQUOTE_CWORD_CBQUOTE 9
2719 #define CENDVAR_CENDVAR_CWORD_CENDVAR 10
2720 #define CENDFILE_CENDFILE_CENDFILE_CENDFILE 11
2721 #define CWORD_CWORD_CWORD_CWORD 12
2722 #define CCTL_CCTL_CCTL_CCTL 13
2725 static const char syntax_index_table[258] = {
2726 /* BASESYNTAX_DQSYNTAX_SQSYNTAX_ARISYNTAX */
2727 /* 0 PEOF */ CENDFILE_CENDFILE_CENDFILE_CENDFILE,
2728 #if ENABLE_ASH_ALIAS
2729 /* 1 PEOA */ CSPCL_CIGN_CIGN_CIGN,
2731 /* 2 -128 0x80 */ CWORD_CWORD_CWORD_CWORD,
2732 /* 3 -127 CTLESC */ CCTL_CCTL_CCTL_CCTL,
2733 /* 4 -126 CTLVAR */ CCTL_CCTL_CCTL_CCTL,
2734 /* 5 -125 CTLENDVAR */ CCTL_CCTL_CCTL_CCTL,
2735 /* 6 -124 CTLBACKQ */ CCTL_CCTL_CCTL_CCTL,
2736 /* 7 -123 CTLQUOTE */ CCTL_CCTL_CCTL_CCTL,
2737 /* 8 -122 CTLARI */ CCTL_CCTL_CCTL_CCTL,
2738 /* 9 -121 CTLENDARI */ CCTL_CCTL_CCTL_CCTL,
2739 /* 10 -120 CTLQUOTEMARK */ CCTL_CCTL_CCTL_CCTL,
2740 /* 11 -119 */ CWORD_CWORD_CWORD_CWORD,
2741 /* 12 -118 */ CWORD_CWORD_CWORD_CWORD,
2742 /* 13 -117 */ CWORD_CWORD_CWORD_CWORD,
2743 /* 14 -116 */ CWORD_CWORD_CWORD_CWORD,
2744 /* 15 -115 */ CWORD_CWORD_CWORD_CWORD,
2745 /* 16 -114 */ CWORD_CWORD_CWORD_CWORD,
2746 /* 17 -113 */ CWORD_CWORD_CWORD_CWORD,
2747 /* 18 -112 */ CWORD_CWORD_CWORD_CWORD,
2748 /* 19 -111 */ CWORD_CWORD_CWORD_CWORD,
2749 /* 20 -110 */ CWORD_CWORD_CWORD_CWORD,
2750 /* 21 -109 */ CWORD_CWORD_CWORD_CWORD,
2751 /* 22 -108 */ CWORD_CWORD_CWORD_CWORD,
2752 /* 23 -107 */ CWORD_CWORD_CWORD_CWORD,
2753 /* 24 -106 */ CWORD_CWORD_CWORD_CWORD,
2754 /* 25 -105 */ CWORD_CWORD_CWORD_CWORD,
2755 /* 26 -104 */ CWORD_CWORD_CWORD_CWORD,
2756 /* 27 -103 */ CWORD_CWORD_CWORD_CWORD,
2757 /* 28 -102 */ CWORD_CWORD_CWORD_CWORD,
2758 /* 29 -101 */ CWORD_CWORD_CWORD_CWORD,
2759 /* 30 -100 */ CWORD_CWORD_CWORD_CWORD,
2760 /* 31 -99 */ CWORD_CWORD_CWORD_CWORD,
2761 /* 32 -98 */ CWORD_CWORD_CWORD_CWORD,
2762 /* 33 -97 */ CWORD_CWORD_CWORD_CWORD,
2763 /* 34 -96 */ CWORD_CWORD_CWORD_CWORD,
2764 /* 35 -95 */ CWORD_CWORD_CWORD_CWORD,
2765 /* 36 -94 */ CWORD_CWORD_CWORD_CWORD,
2766 /* 37 -93 */ CWORD_CWORD_CWORD_CWORD,
2767 /* 38 -92 */ CWORD_CWORD_CWORD_CWORD,
2768 /* 39 -91 */ CWORD_CWORD_CWORD_CWORD,
2769 /* 40 -90 */ CWORD_CWORD_CWORD_CWORD,
2770 /* 41 -89 */ CWORD_CWORD_CWORD_CWORD,
2771 /* 42 -88 */ CWORD_CWORD_CWORD_CWORD,
2772 /* 43 -87 */ CWORD_CWORD_CWORD_CWORD,
2773 /* 44 -86 */ CWORD_CWORD_CWORD_CWORD,
2774 /* 45 -85 */ CWORD_CWORD_CWORD_CWORD,
2775 /* 46 -84 */ CWORD_CWORD_CWORD_CWORD,
2776 /* 47 -83 */ CWORD_CWORD_CWORD_CWORD,
2777 /* 48 -82 */ CWORD_CWORD_CWORD_CWORD,
2778 /* 49 -81 */ CWORD_CWORD_CWORD_CWORD,
2779 /* 50 -80 */ CWORD_CWORD_CWORD_CWORD,
2780 /* 51 -79 */ CWORD_CWORD_CWORD_CWORD,
2781 /* 52 -78 */ CWORD_CWORD_CWORD_CWORD,
2782 /* 53 -77 */ CWORD_CWORD_CWORD_CWORD,
2783 /* 54 -76 */ CWORD_CWORD_CWORD_CWORD,
2784 /* 55 -75 */ CWORD_CWORD_CWORD_CWORD,
2785 /* 56 -74 */ CWORD_CWORD_CWORD_CWORD,
2786 /* 57 -73 */ CWORD_CWORD_CWORD_CWORD,
2787 /* 58 -72 */ CWORD_CWORD_CWORD_CWORD,
2788 /* 59 -71 */ CWORD_CWORD_CWORD_CWORD,
2789 /* 60 -70 */ CWORD_CWORD_CWORD_CWORD,
2790 /* 61 -69 */ CWORD_CWORD_CWORD_CWORD,
2791 /* 62 -68 */ CWORD_CWORD_CWORD_CWORD,
2792 /* 63 -67 */ CWORD_CWORD_CWORD_CWORD,
2793 /* 64 -66 */ CWORD_CWORD_CWORD_CWORD,
2794 /* 65 -65 */ CWORD_CWORD_CWORD_CWORD,
2795 /* 66 -64 */ CWORD_CWORD_CWORD_CWORD,
2796 /* 67 -63 */ CWORD_CWORD_CWORD_CWORD,
2797 /* 68 -62 */ CWORD_CWORD_CWORD_CWORD,
2798 /* 69 -61 */ CWORD_CWORD_CWORD_CWORD,
2799 /* 70 -60 */ CWORD_CWORD_CWORD_CWORD,
2800 /* 71 -59 */ CWORD_CWORD_CWORD_CWORD,
2801 /* 72 -58 */ CWORD_CWORD_CWORD_CWORD,
2802 /* 73 -57 */ CWORD_CWORD_CWORD_CWORD,
2803 /* 74 -56 */ CWORD_CWORD_CWORD_CWORD,
2804 /* 75 -55 */ CWORD_CWORD_CWORD_CWORD,
2805 /* 76 -54 */ CWORD_CWORD_CWORD_CWORD,
2806 /* 77 -53 */ CWORD_CWORD_CWORD_CWORD,
2807 /* 78 -52 */ CWORD_CWORD_CWORD_CWORD,
2808 /* 79 -51 */ CWORD_CWORD_CWORD_CWORD,
2809 /* 80 -50 */ CWORD_CWORD_CWORD_CWORD,
2810 /* 81 -49 */ CWORD_CWORD_CWORD_CWORD,
2811 /* 82 -48 */ CWORD_CWORD_CWORD_CWORD,
2812 /* 83 -47 */ CWORD_CWORD_CWORD_CWORD,
2813 /* 84 -46 */ CWORD_CWORD_CWORD_CWORD,
2814 /* 85 -45 */ CWORD_CWORD_CWORD_CWORD,
2815 /* 86 -44 */ CWORD_CWORD_CWORD_CWORD,
2816 /* 87 -43 */ CWORD_CWORD_CWORD_CWORD,
2817 /* 88 -42 */ CWORD_CWORD_CWORD_CWORD,
2818 /* 89 -41 */ CWORD_CWORD_CWORD_CWORD,
2819 /* 90 -40 */ CWORD_CWORD_CWORD_CWORD,
2820 /* 91 -39 */ CWORD_CWORD_CWORD_CWORD,
2821 /* 92 -38 */ CWORD_CWORD_CWORD_CWORD,
2822 /* 93 -37 */ CWORD_CWORD_CWORD_CWORD,
2823 /* 94 -36 */ CWORD_CWORD_CWORD_CWORD,
2824 /* 95 -35 */ CWORD_CWORD_CWORD_CWORD,
2825 /* 96 -34 */ CWORD_CWORD_CWORD_CWORD,
2826 /* 97 -33 */ CWORD_CWORD_CWORD_CWORD,
2827 /* 98 -32 */ CWORD_CWORD_CWORD_CWORD,
2828 /* 99 -31 */ CWORD_CWORD_CWORD_CWORD,
2829 /* 100 -30 */ CWORD_CWORD_CWORD_CWORD,
2830 /* 101 -29 */ CWORD_CWORD_CWORD_CWORD,
2831 /* 102 -28 */ CWORD_CWORD_CWORD_CWORD,
2832 /* 103 -27 */ CWORD_CWORD_CWORD_CWORD,
2833 /* 104 -26 */ CWORD_CWORD_CWORD_CWORD,
2834 /* 105 -25 */ CWORD_CWORD_CWORD_CWORD,
2835 /* 106 -24 */ CWORD_CWORD_CWORD_CWORD,
2836 /* 107 -23 */ CWORD_CWORD_CWORD_CWORD,
2837 /* 108 -22 */ CWORD_CWORD_CWORD_CWORD,
2838 /* 109 -21 */ CWORD_CWORD_CWORD_CWORD,
2839 /* 110 -20 */ CWORD_CWORD_CWORD_CWORD,
2840 /* 111 -19 */ CWORD_CWORD_CWORD_CWORD,
2841 /* 112 -18 */ CWORD_CWORD_CWORD_CWORD,
2842 /* 113 -17 */ CWORD_CWORD_CWORD_CWORD,
2843 /* 114 -16 */ CWORD_CWORD_CWORD_CWORD,
2844 /* 115 -15 */ CWORD_CWORD_CWORD_CWORD,
2845 /* 116 -14 */ CWORD_CWORD_CWORD_CWORD,
2846 /* 117 -13 */ CWORD_CWORD_CWORD_CWORD,
2847 /* 118 -12 */ CWORD_CWORD_CWORD_CWORD,
2848 /* 119 -11 */ CWORD_CWORD_CWORD_CWORD,
2849 /* 120 -10 */ CWORD_CWORD_CWORD_CWORD,
2850 /* 121 -9 */ CWORD_CWORD_CWORD_CWORD,
2851 /* 122 -8 */ CWORD_CWORD_CWORD_CWORD,
2852 /* 123 -7 */ CWORD_CWORD_CWORD_CWORD,
2853 /* 124 -6 */ CWORD_CWORD_CWORD_CWORD,
2854 /* 125 -5 */ CWORD_CWORD_CWORD_CWORD,
2855 /* 126 -4 */ CWORD_CWORD_CWORD_CWORD,
2856 /* 127 -3 */ CWORD_CWORD_CWORD_CWORD,
2857 /* 128 -2 */ CWORD_CWORD_CWORD_CWORD,
2858 /* 129 -1 */ CWORD_CWORD_CWORD_CWORD,
2859 /* 130 0 */ CWORD_CWORD_CWORD_CWORD,
2860 /* 131 1 */ CWORD_CWORD_CWORD_CWORD,
2861 /* 132 2 */ CWORD_CWORD_CWORD_CWORD,
2862 /* 133 3 */ CWORD_CWORD_CWORD_CWORD,
2863 /* 134 4 */ CWORD_CWORD_CWORD_CWORD,
2864 /* 135 5 */ CWORD_CWORD_CWORD_CWORD,
2865 /* 136 6 */ CWORD_CWORD_CWORD_CWORD,
2866 /* 137 7 */ CWORD_CWORD_CWORD_CWORD,
2867 /* 138 8 */ CWORD_CWORD_CWORD_CWORD,
2868 /* 139 9 "\t" */ CSPCL_CWORD_CWORD_CWORD,
2869 /* 140 10 "\n" */ CNL_CNL_CNL_CNL,
2870 /* 141 11 */ CWORD_CWORD_CWORD_CWORD,
2871 /* 142 12 */ CWORD_CWORD_CWORD_CWORD,
2872 /* 143 13 */ CWORD_CWORD_CWORD_CWORD,
2873 /* 144 14 */ CWORD_CWORD_CWORD_CWORD,
2874 /* 145 15 */ CWORD_CWORD_CWORD_CWORD,
2875 /* 146 16 */ CWORD_CWORD_CWORD_CWORD,
2876 /* 147 17 */ CWORD_CWORD_CWORD_CWORD,
2877 /* 148 18 */ CWORD_CWORD_CWORD_CWORD,
2878 /* 149 19 */ CWORD_CWORD_CWORD_CWORD,
2879 /* 150 20 */ CWORD_CWORD_CWORD_CWORD,
2880 /* 151 21 */ CWORD_CWORD_CWORD_CWORD,
2881 /* 152 22 */ CWORD_CWORD_CWORD_CWORD,
2882 /* 153 23 */ CWORD_CWORD_CWORD_CWORD,
2883 /* 154 24 */ CWORD_CWORD_CWORD_CWORD,
2884 /* 155 25 */ CWORD_CWORD_CWORD_CWORD,
2885 /* 156 26 */ CWORD_CWORD_CWORD_CWORD,
2886 /* 157 27 */ CWORD_CWORD_CWORD_CWORD,
2887 /* 158 28 */ CWORD_CWORD_CWORD_CWORD,
2888 /* 159 29 */ CWORD_CWORD_CWORD_CWORD,
2889 /* 160 30 */ CWORD_CWORD_CWORD_CWORD,
2890 /* 161 31 */ CWORD_CWORD_CWORD_CWORD,
2891 /* 162 32 " " */ CSPCL_CWORD_CWORD_CWORD,
2892 /* 163 33 "!" */ CWORD_CCTL_CCTL_CWORD,
2893 /* 164 34 """ */ CDQUOTE_CENDQUOTE_CWORD_CWORD,
2894 /* 165 35 "#" */ CWORD_CWORD_CWORD_CWORD,
2895 /* 166 36 "$" */ CVAR_CVAR_CWORD_CVAR,
2896 /* 167 37 "%" */ CWORD_CWORD_CWORD_CWORD,
2897 /* 168 38 "&" */ CSPCL_CWORD_CWORD_CWORD,
2898 /* 169 39 "'" */ CSQUOTE_CWORD_CENDQUOTE_CWORD,
2899 /* 170 40 "(" */ CSPCL_CWORD_CWORD_CLP,
2900 /* 171 41 ")" */ CSPCL_CWORD_CWORD_CRP,
2901 /* 172 42 "*" */ CWORD_CCTL_CCTL_CWORD,
2902 /* 173 43 "+" */ CWORD_CWORD_CWORD_CWORD,
2903 /* 174 44 "," */ CWORD_CWORD_CWORD_CWORD,
2904 /* 175 45 "-" */ CWORD_CCTL_CCTL_CWORD,
2905 /* 176 46 "." */ CWORD_CWORD_CWORD_CWORD,
2906 /* 177 47 "/" */ CWORD_CCTL_CCTL_CWORD,
2907 /* 178 48 "0" */ CWORD_CWORD_CWORD_CWORD,
2908 /* 179 49 "1" */ CWORD_CWORD_CWORD_CWORD,
2909 /* 180 50 "2" */ CWORD_CWORD_CWORD_CWORD,
2910 /* 181 51 "3" */ CWORD_CWORD_CWORD_CWORD,
2911 /* 182 52 "4" */ CWORD_CWORD_CWORD_CWORD,
2912 /* 183 53 "5" */ CWORD_CWORD_CWORD_CWORD,
2913 /* 184 54 "6" */ CWORD_CWORD_CWORD_CWORD,
2914 /* 185 55 "7" */ CWORD_CWORD_CWORD_CWORD,
2915 /* 186 56 "8" */ CWORD_CWORD_CWORD_CWORD,
2916 /* 187 57 "9" */ CWORD_CWORD_CWORD_CWORD,
2917 /* 188 58 ":" */ CWORD_CCTL_CCTL_CWORD,
2918 /* 189 59 ";" */ CSPCL_CWORD_CWORD_CWORD,
2919 /* 190 60 "<" */ CSPCL_CWORD_CWORD_CWORD,
2920 /* 191 61 "=" */ CWORD_CCTL_CCTL_CWORD,
2921 /* 192 62 ">" */ CSPCL_CWORD_CWORD_CWORD,
2922 /* 193 63 "?" */ CWORD_CCTL_CCTL_CWORD,
2923 /* 194 64 "@" */ CWORD_CWORD_CWORD_CWORD,
2924 /* 195 65 "A" */ CWORD_CWORD_CWORD_CWORD,
2925 /* 196 66 "B" */ CWORD_CWORD_CWORD_CWORD,
2926 /* 197 67 "C" */ CWORD_CWORD_CWORD_CWORD,
2927 /* 198 68 "D" */ CWORD_CWORD_CWORD_CWORD,
2928 /* 199 69 "E" */ CWORD_CWORD_CWORD_CWORD,
2929 /* 200 70 "F" */ CWORD_CWORD_CWORD_CWORD,
2930 /* 201 71 "G" */ CWORD_CWORD_CWORD_CWORD,
2931 /* 202 72 "H" */ CWORD_CWORD_CWORD_CWORD,
2932 /* 203 73 "I" */ CWORD_CWORD_CWORD_CWORD,
2933 /* 204 74 "J" */ CWORD_CWORD_CWORD_CWORD,
2934 /* 205 75 "K" */ CWORD_CWORD_CWORD_CWORD,
2935 /* 206 76 "L" */ CWORD_CWORD_CWORD_CWORD,
2936 /* 207 77 "M" */ CWORD_CWORD_CWORD_CWORD,
2937 /* 208 78 "N" */ CWORD_CWORD_CWORD_CWORD,
2938 /* 209 79 "O" */ CWORD_CWORD_CWORD_CWORD,
2939 /* 210 80 "P" */ CWORD_CWORD_CWORD_CWORD,
2940 /* 211 81 "Q" */ CWORD_CWORD_CWORD_CWORD,
2941 /* 212 82 "R" */ CWORD_CWORD_CWORD_CWORD,
2942 /* 213 83 "S" */ CWORD_CWORD_CWORD_CWORD,
2943 /* 214 84 "T" */ CWORD_CWORD_CWORD_CWORD,
2944 /* 215 85 "U" */ CWORD_CWORD_CWORD_CWORD,
2945 /* 216 86 "V" */ CWORD_CWORD_CWORD_CWORD,
2946 /* 217 87 "W" */ CWORD_CWORD_CWORD_CWORD,
2947 /* 218 88 "X" */ CWORD_CWORD_CWORD_CWORD,
2948 /* 219 89 "Y" */ CWORD_CWORD_CWORD_CWORD,
2949 /* 220 90 "Z" */ CWORD_CWORD_CWORD_CWORD,
2950 /* 221 91 "[" */ CWORD_CCTL_CCTL_CWORD,
2951 /* 222 92 "\" */ CBACK_CBACK_CCTL_CBACK,
2952 /* 223 93 "]" */ CWORD_CCTL_CCTL_CWORD,
2953 /* 224 94 "^" */ CWORD_CWORD_CWORD_CWORD,
2954 /* 225 95 "_" */ CWORD_CWORD_CWORD_CWORD,
2955 /* 226 96 "`" */ CBQUOTE_CBQUOTE_CWORD_CBQUOTE,
2956 /* 227 97 "a" */ CWORD_CWORD_CWORD_CWORD,
2957 /* 228 98 "b" */ CWORD_CWORD_CWORD_CWORD,
2958 /* 229 99 "c" */ CWORD_CWORD_CWORD_CWORD,
2959 /* 230 100 "d" */ CWORD_CWORD_CWORD_CWORD,
2960 /* 231 101 "e" */ CWORD_CWORD_CWORD_CWORD,
2961 /* 232 102 "f" */ CWORD_CWORD_CWORD_CWORD,
2962 /* 233 103 "g" */ CWORD_CWORD_CWORD_CWORD,
2963 /* 234 104 "h" */ CWORD_CWORD_CWORD_CWORD,
2964 /* 235 105 "i" */ CWORD_CWORD_CWORD_CWORD,
2965 /* 236 106 "j" */ CWORD_CWORD_CWORD_CWORD,
2966 /* 237 107 "k" */ CWORD_CWORD_CWORD_CWORD,
2967 /* 238 108 "l" */ CWORD_CWORD_CWORD_CWORD,
2968 /* 239 109 "m" */ CWORD_CWORD_CWORD_CWORD,
2969 /* 240 110 "n" */ CWORD_CWORD_CWORD_CWORD,
2970 /* 241 111 "o" */ CWORD_CWORD_CWORD_CWORD,
2971 /* 242 112 "p" */ CWORD_CWORD_CWORD_CWORD,
2972 /* 243 113 "q" */ CWORD_CWORD_CWORD_CWORD,
2973 /* 244 114 "r" */ CWORD_CWORD_CWORD_CWORD,
2974 /* 245 115 "s" */ CWORD_CWORD_CWORD_CWORD,
2975 /* 246 116 "t" */ CWORD_CWORD_CWORD_CWORD,
2976 /* 247 117 "u" */ CWORD_CWORD_CWORD_CWORD,
2977 /* 248 118 "v" */ CWORD_CWORD_CWORD_CWORD,
2978 /* 249 119 "w" */ CWORD_CWORD_CWORD_CWORD,
2979 /* 250 120 "x" */ CWORD_CWORD_CWORD_CWORD,
2980 /* 251 121 "y" */ CWORD_CWORD_CWORD_CWORD,
2981 /* 252 122 "z" */ CWORD_CWORD_CWORD_CWORD,
2982 /* 253 123 "{" */ CWORD_CWORD_CWORD_CWORD,
2983 /* 254 124 "|" */ CSPCL_CWORD_CWORD_CWORD,
2984 /* 255 125 "}" */ CENDVAR_CENDVAR_CWORD_CENDVAR,
2985 /* 256 126 "~" */ CWORD_CCTL_CCTL_CWORD,
2986 /* 257 127 */ CWORD_CWORD_CWORD_CWORD,
2989 #define SIT(c, syntax) (S_I_T[(int)syntax_index_table[((int)c)+SYNBASE]][syntax])
2991 #endif /* USE_SIT_FUNCTION */
2994 /* ============ Alias handling */
2996 #if ENABLE_ASH_ALIAS
2998 #define ALIASINUSE 1
3009 static struct alias **atab; // [ATABSIZE];
3010 #define INIT_G_alias() do { \
3011 atab = xzalloc(ATABSIZE * sizeof(atab[0])); \
3015 static struct alias **
3016 __lookupalias(const char *name) {
3017 unsigned int hashval;
3024 ch = (unsigned char)*p;
3028 ch = (unsigned char)*++p;
3030 app = &atab[hashval % ATABSIZE];
3032 for (; *app; app = &(*app)->next) {
3033 if (strcmp(name, (*app)->name) == 0) {
3041 static struct alias *
3042 lookupalias(const char *name, int check)
3044 struct alias *ap = *__lookupalias(name);
3046 if (check && ap && (ap->flag & ALIASINUSE))
3051 static struct alias *
3052 freealias(struct alias *ap)
3056 if (ap->flag & ALIASINUSE) {
3057 ap->flag |= ALIASDEAD;
3069 setalias(const char *name, const char *val)
3071 struct alias *ap, **app;
3073 app = __lookupalias(name);
3077 if (!(ap->flag & ALIASINUSE)) {
3080 ap->val = ckstrdup(val);
3081 ap->flag &= ~ALIASDEAD;
3084 ap = ckzalloc(sizeof(struct alias));
3085 ap->name = ckstrdup(name);
3086 ap->val = ckstrdup(val);
3087 /*ap->flag = 0; - ckzalloc did it */
3088 /*ap->next = NULL;*/
3095 unalias(const char *name)
3099 app = __lookupalias(name);
3103 *app = freealias(*app);
3114 struct alias *ap, **app;
3118 for (i = 0; i < ATABSIZE; i++) {
3120 for (ap = *app; ap; ap = *app) {
3121 *app = freealias(*app);
3131 printalias(const struct alias *ap)
3133 out1fmt("%s=%s\n", ap->name, single_quote(ap->val));
3137 * TODO - sort output
3140 aliascmd(int argc UNUSED_PARAM, char **argv)
3149 for (i = 0; i < ATABSIZE; i++) {
3150 for (ap = atab[i]; ap; ap = ap->next) {
3156 while ((n = *++argv) != NULL) {
3157 v = strchr(n+1, '=');
3158 if (v == NULL) { /* n+1: funny ksh stuff */
3159 ap = *__lookupalias(n);
3161 fprintf(stderr, "%s: %s not found\n", "alias", n);
3175 unaliascmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
3179 while ((i = nextopt("a")) != '\0') {
3185 for (i = 0; *argptr; argptr++) {
3186 if (unalias(*argptr)) {
3187 fprintf(stderr, "%s: %s not found\n", "unalias", *argptr);
3195 #endif /* ASH_ALIAS */
3198 /* ============ jobs.c */
3200 /* Mode argument to forkshell. Don't change FORK_FG or FORK_BG. */
3203 #define FORK_NOJOB 2
3205 /* mode flags for showjob(s) */
3206 #define SHOW_PGID 0x01 /* only show pgid - for jobs -p */
3207 #define SHOW_PID 0x04 /* include process pid */
3208 #define SHOW_CHANGED 0x08 /* only jobs whose state has changed */
3211 * A job structure contains information about a job. A job is either a
3212 * single process or a set of processes contained in a pipeline. In the
3213 * latter case, pidlist will be non-NULL, and will point to a -1 terminated
3218 pid_t pid; /* process id */
3219 int status; /* last process status from wait() */
3220 char *cmd; /* text of command being run */
3224 struct procstat ps0; /* status of process */
3225 struct procstat *ps; /* status or processes when more than one */
3227 int stopstatus; /* status of a stopped job */
3230 nprocs: 16, /* number of processes */
3232 #define JOBRUNNING 0 /* at least one proc running */
3233 #define JOBSTOPPED 1 /* all procs are stopped */
3234 #define JOBDONE 2 /* all procs are completed */
3236 sigint: 1, /* job was killed by SIGINT */
3237 jobctl: 1, /* job running under job control */
3239 waited: 1, /* true if this entry has been waited for */
3240 used: 1, /* true if this entry is in used */
3241 changed: 1; /* true if status has changed */
3242 struct job *prev_job; /* previous job */
3245 static struct job *makejob(/*union node *,*/ int);
3247 #define forkshell(job, node, mode) forkshell(job, mode)
3249 static int forkshell(struct job *, union node *, int);
3250 static int waitforjob(struct job *);
3253 enum { doing_jobctl = 0 };
3254 #define setjobctl(on) do {} while (0)
3256 static smallint doing_jobctl; //references:8
3257 static void setjobctl(int);
3261 * Set the signal handler for the specified signal. The routine figures
3262 * out what it should be set to.
3265 setsignal(int signo)
3269 struct sigaction act;
3275 else if (*t != '\0')
3277 if (rootshell && action == S_DFL) {
3280 if (iflag || minusc || sflag == 0)
3303 t = &sigmode[signo - 1];
3307 * current setting unknown
3309 if (sigaction(signo, NULL, &act) == -1) {
3311 * Pretend it worked; maybe we should give a warning
3312 * here, but other shells don't. We don't alter
3313 * sigmode, so that we retry every time.
3317 tsig = S_RESET; /* force to be set */
3318 if (act.sa_handler == SIG_IGN) {
3321 && (signo == SIGTSTP || signo == SIGTTIN || signo == SIGTTOU)
3323 tsig = S_IGN; /* don't hard ignore these */
3327 if (tsig == S_HARD_IGN || tsig == action)
3329 act.sa_handler = SIG_DFL;
3332 act.sa_handler = onsig;
3335 act.sa_handler = SIG_IGN;
3340 sigfillset(&act.sa_mask);
3341 sigaction_set(signo, &act);
3344 /* mode flags for set_curjob */
3345 #define CUR_DELETE 2
3346 #define CUR_RUNNING 1
3347 #define CUR_STOPPED 0
3349 /* mode flags for dowait */
3350 #define DOWAIT_NONBLOCK WNOHANG
3351 #define DOWAIT_BLOCK 0
3354 /* pgrp of shell on invocation */
3355 static int initialpgrp; //references:2
3356 static int ttyfd = -1; //5
3359 static struct job *jobtab; //5
3361 static unsigned njobs; //4
3363 static struct job *curjob; //lots
3364 /* number of presumed living untracked jobs */
3365 static int jobless; //4
3368 set_curjob(struct job *jp, unsigned mode)
3371 struct job **jpp, **curp;
3373 /* first remove from list */
3374 jpp = curp = &curjob;
3379 jpp = &jp1->prev_job;
3381 *jpp = jp1->prev_job;
3383 /* Then re-insert in correct position */
3391 /* job being deleted */
3394 /* newly created job or backgrounded job,
3395 put after all stopped jobs. */
3399 if (!jp1 || jp1->state != JOBSTOPPED)
3402 jpp = &jp1->prev_job;
3408 /* newly stopped job - becomes curjob */
3409 jp->prev_job = *jpp;
3417 jobno(const struct job *jp)
3419 return jp - jobtab + 1;
3424 * Convert a job name to a job structure.
3427 #define getjob(name, getctl) getjob(name)
3430 getjob(const char *name, int getctl)
3434 const char *err_msg = "No such job: %s";
3438 char *(*match)(const char *, const char *);
3453 if (c == '+' || c == '%') {
3455 err_msg = "No current job";
3461 err_msg = "No previous job";
3470 // TODO: number() instead? It does error checking...
3473 jp = jobtab + num - 1;
3490 if (match(jp->ps[0].cmd, p)) {
3494 err_msg = "%s: ambiguous";
3501 err_msg = "job %s not created under job control";
3502 if (getctl && jp->jobctl == 0)
3507 ash_msg_and_raise_error(err_msg, name);
3511 * Mark a job structure as unused.
3514 freejob(struct job *jp)
3516 struct procstat *ps;
3520 for (i = jp->nprocs, ps = jp->ps; --i >= 0; ps++) {
3521 if (ps->cmd != nullstr)
3524 if (jp->ps != &jp->ps0)
3527 set_curjob(jp, CUR_DELETE);
3533 xtcsetpgrp(int fd, pid_t pgrp)
3535 if (tcsetpgrp(fd, pgrp))
3536 ash_msg_and_raise_error("can't set tty process group (%m)");
3540 * Turn job control on and off.
3542 * Note: This code assumes that the third arg to ioctl is a character
3543 * pointer, which is true on Berkeley systems but not System V. Since
3544 * System V doesn't have job control yet, this isn't a problem now.
3546 * Called with interrupts off.
3554 if (on == doing_jobctl || rootshell == 0)
3558 ofd = fd = open(_PATH_TTY, O_RDWR);
3560 /* BTW, bash will try to open(ttyname(0)) if open("/dev/tty") fails.
3561 * That sometimes helps to acquire controlling tty.
3562 * Obviously, a workaround for bugs when someone
3563 * failed to provide a controlling tty to bash! :) */
3569 fd = fcntl(fd, F_DUPFD, 10);
3574 /* fd is a tty at this point */
3575 close_on_exec_on(fd);
3576 do { /* while we are in the background */
3577 pgrp = tcgetpgrp(fd);
3580 ash_msg("can't access tty; job control turned off");
3584 if (pgrp == getpgrp())
3595 xtcsetpgrp(fd, pgrp);
3597 /* turning job control off */
3600 /* was xtcsetpgrp, but this can make exiting ash
3601 * loop forever if pty is already deleted */
3602 tcsetpgrp(fd, pgrp);
3617 killcmd(int argc, char **argv)
3620 if (argv[1] && strcmp(argv[1], "-l") != 0) {
3622 if (argv[i][0] == '%') {
3623 struct job *jp = getjob(argv[i], 0);
3624 unsigned pid = jp->ps[0].pid;
3625 /* Enough space for ' -NNN<nul>' */
3626 argv[i] = alloca(sizeof(int)*3 + 3);
3627 /* kill_main has matching code to expect
3628 * leading space. Needed to not confuse
3629 * negative pids with "kill -SIGNAL_NO" syntax */
3630 sprintf(argv[i], " -%u", pid);
3632 } while (argv[++i]);
3634 return kill_main(argc, argv);
3638 showpipe(struct job *jp, FILE *out)
3640 struct procstat *sp;
3641 struct procstat *spend;
3643 spend = jp->ps + jp->nprocs;
3644 for (sp = jp->ps + 1; sp < spend; sp++)
3645 fprintf(out, " | %s", sp->cmd);
3646 outcslow('\n', out);
3647 flush_stdout_stderr();
3652 restartjob(struct job *jp, int mode)
3654 struct procstat *ps;
3660 if (jp->state == JOBDONE)
3662 jp->state = JOBRUNNING;
3664 if (mode == FORK_FG)
3665 xtcsetpgrp(ttyfd, pgid);
3666 killpg(pgid, SIGCONT);
3670 if (WIFSTOPPED(ps->status)) {
3676 status = (mode == FORK_FG) ? waitforjob(jp) : 0;
3682 fg_bgcmd(int argc UNUSED_PARAM, char **argv)
3689 mode = (**argv == 'f') ? FORK_FG : FORK_BG;
3694 jp = getjob(*argv, 1);
3695 if (mode == FORK_BG) {
3696 set_curjob(jp, CUR_RUNNING);
3697 fprintf(out, "[%d] ", jobno(jp));
3699 outstr(jp->ps->cmd, out);
3701 retval = restartjob(jp, mode);
3702 } while (*argv && *++argv);
3708 sprint_status(char *s, int status, int sigonly)
3714 if (!WIFEXITED(status)) {
3716 if (WIFSTOPPED(status))
3717 st = WSTOPSIG(status);
3720 st = WTERMSIG(status);
3722 if (st == SIGINT || st == SIGPIPE)
3725 if (WIFSTOPPED(status))
3730 col = fmtstr(s, 32, strsignal(st));
3731 if (WCOREDUMP(status)) {
3732 col += fmtstr(s + col, 16, " (core dumped)");
3734 } else if (!sigonly) {
3735 st = WEXITSTATUS(status);
3737 col = fmtstr(s, 16, "Done(%d)", st);
3739 col = fmtstr(s, 16, "Done");
3746 * Do a wait system call. If job control is compiled in, we accept
3747 * stopped processes. If block is zero, we return a value of zero
3748 * rather than blocking.
3750 * System V doesn't have a non-blocking wait system call. It does
3751 * have a SIGCLD signal that is sent to a process when one of it's
3752 * children dies. The obvious way to use SIGCLD would be to install
3753 * a handler for SIGCLD which simply bumped a counter when a SIGCLD
3754 * was received, and have waitproc bump another counter when it got
3755 * the status of a process. Waitproc would then know that a wait
3756 * system call would not block if the two counters were different.
3757 * This approach doesn't work because if a process has children that
3758 * have not been waited for, System V will send it a SIGCLD when it
3759 * installs a signal handler for SIGCLD. What this means is that when
3760 * a child exits, the shell will be sent SIGCLD signals continuously
3761 * until is runs out of stack space, unless it does a wait call before
3762 * restoring the signal handler. The code below takes advantage of
3763 * this (mis)feature by installing a signal handler for SIGCLD and
3764 * then checking to see whether it was called. If there are any
3765 * children to be waited for, it will be.
3767 * If neither SYSV nor BSD is defined, we don't implement nonblocking
3768 * waits at all. In this case, the user will not be informed when
3769 * a background process until the next time she runs a real program
3770 * (as opposed to running a builtin command or just typing return),
3771 * and the jobs command may give out of date information.
3774 waitproc(int wait_flags, int *status)
3778 wait_flags |= WUNTRACED;
3780 /* NB: _not_ safe_waitpid, we need to detect EINTR */
3781 return waitpid(-1, status, wait_flags);
3785 * Wait for a process to terminate.
3788 dowait(int wait_flags, struct job *job)
3793 struct job *thisjob;
3796 TRACE(("dowait(%d) called\n", wait_flags));
3797 pid = waitproc(wait_flags, &status);
3798 TRACE(("wait returns pid=%d, status=%d\n", pid, status));
3800 /* If we were doing blocking wait and (probably) got EINTR,
3801 * check for pending sigs received while waiting.
3802 * (NB: can be moved into callers if needed) */
3803 if (wait_flags == DOWAIT_BLOCK && pendingsig)
3804 raise_exception(EXSIG);
3809 for (jp = curjob; jp; jp = jp->prev_job) {
3810 struct procstat *sp;
3811 struct procstat *spend;
3812 if (jp->state == JOBDONE)
3815 spend = jp->ps + jp->nprocs;
3818 if (sp->pid == pid) {
3819 TRACE(("Job %d: changing status of proc %d "
3820 "from 0x%x to 0x%x\n",
3821 jobno(jp), pid, sp->status, status));
3822 sp->status = status;
3825 if (sp->status == -1)
3828 if (state == JOBRUNNING)
3830 if (WIFSTOPPED(sp->status)) {
3831 jp->stopstatus = sp->status;
3835 } while (++sp < spend);
3840 if (!WIFSTOPPED(status))
3846 if (state != JOBRUNNING) {
3847 thisjob->changed = 1;
3849 if (thisjob->state != state) {
3850 TRACE(("Job %d: changing state from %d to %d\n",
3851 jobno(thisjob), thisjob->state, state));
3852 thisjob->state = state;
3854 if (state == JOBSTOPPED) {
3855 set_curjob(thisjob, CUR_STOPPED);
3864 if (thisjob && thisjob == job) {
3868 len = sprint_status(s, status, 1);
3880 showjob(FILE *out, struct job *jp, int mode)
3882 struct procstat *ps;
3883 struct procstat *psend;
3890 if (mode & SHOW_PGID) {
3891 /* just output process (group) id of pipeline */
3892 fprintf(out, "%d\n", ps->pid);
3896 col = fmtstr(s, 16, "[%d] ", jobno(jp));
3901 else if (curjob && jp == curjob->prev_job)
3904 if (mode & SHOW_PID)
3905 col += fmtstr(s + col, 16, "%d ", ps->pid);
3907 psend = ps + jp->nprocs;
3909 if (jp->state == JOBRUNNING) {
3910 strcpy(s + col, "Running");
3911 col += sizeof("Running") - 1;
3913 int status = psend[-1].status;
3914 if (jp->state == JOBSTOPPED)
3915 status = jp->stopstatus;
3916 col += sprint_status(s + col, status, 0);
3922 /* for each process */
3923 col = fmtstr(s, 48, " |\n%*c%d ", indent_col, ' ', ps->pid) - 3;
3925 fprintf(out, "%s%*c%s",
3926 s, 33 - col >= 0 ? 33 - col : 0, ' ', ps->cmd
3928 if (!(mode & SHOW_PID)) {
3932 if (++ps == psend) {
3933 outcslow('\n', out);
3940 if (jp->state == JOBDONE) {
3941 TRACE(("showjob: freeing job %d\n", jobno(jp)));
3947 * Print a list of jobs. If "change" is nonzero, only print jobs whose
3948 * statuses have changed since the last call to showjobs.
3951 showjobs(FILE *out, int mode)
3955 TRACE(("showjobs(%x) called\n", mode));
3957 /* If not even one job changed, there is nothing to do */
3958 while (dowait(DOWAIT_NONBLOCK, NULL) > 0)
3961 for (jp = curjob; jp; jp = jp->prev_job) {
3962 if (!(mode & SHOW_CHANGED) || jp->changed) {
3963 showjob(out, jp, mode);
3969 jobscmd(int argc UNUSED_PARAM, char **argv)
3974 while ((m = nextopt("lp"))) {
3984 showjob(stdout, getjob(*argv,0), mode);
3987 showjobs(stdout, mode);
3994 getstatus(struct job *job)
3999 status = job->ps[job->nprocs - 1].status;
4000 retval = WEXITSTATUS(status);
4001 if (!WIFEXITED(status)) {
4003 retval = WSTOPSIG(status);
4004 if (!WIFSTOPPED(status))
4007 /* XXX: limits number of signals */
4008 retval = WTERMSIG(status);
4010 if (retval == SIGINT)
4016 TRACE(("getstatus: job %d, nproc %d, status %x, retval %x\n",
4017 jobno(job), job->nprocs, status, retval));
4022 waitcmd(int argc UNUSED_PARAM, char **argv)
4031 raise_exception(EXSIG);
4038 /* wait for all jobs */
4042 if (!jp) /* no running procs */
4044 if (jp->state == JOBRUNNING)
4049 dowait(DOWAIT_BLOCK, NULL);
4055 if (**argv != '%') {
4056 pid_t pid = number(*argv);
4061 if (job->ps[job->nprocs - 1].pid == pid)
4063 job = job->prev_job;
4066 job = getjob(*argv, 0);
4067 /* loop until process terminated or stopped */
4068 while (job->state == JOBRUNNING)
4069 dowait(DOWAIT_BLOCK, NULL);
4071 retval = getstatus(job);
4085 struct job *jp, *jq;
4087 len = njobs * sizeof(*jp);
4089 jp = ckrealloc(jq, len + 4 * sizeof(*jp));
4091 offset = (char *)jp - (char *)jq;
4093 /* Relocate pointers */
4096 jq = (struct job *)((char *)jq + l);
4100 #define joff(p) ((struct job *)((char *)(p) + l))
4101 #define jmove(p) (p) = (void *)((char *)(p) + offset)
4102 if (joff(jp)->ps == &jq->ps0)
4103 jmove(joff(jp)->ps);
4104 if (joff(jp)->prev_job)
4105 jmove(joff(jp)->prev_job);
4115 jp = (struct job *)((char *)jp + len);
4119 } while (--jq >= jp);
4124 * Return a new job structure.
4125 * Called with interrupts off.
4128 makejob(/*union node *node,*/ int nprocs)
4133 for (i = njobs, jp = jobtab; ; jp++) {
4140 if (jp->state != JOBDONE || !jp->waited)
4149 memset(jp, 0, sizeof(*jp));
4151 /* jp->jobctl is a bitfield.
4152 * "jp->jobctl |= jobctl" likely to give awful code */
4156 jp->prev_job = curjob;
4161 jp->ps = ckmalloc(nprocs * sizeof(struct procstat));
4163 TRACE(("makejob(%d) returns %%%d\n", nprocs,
4170 * Return a string identifying a command (to be printed by the
4173 static char *cmdnextc;
4176 cmdputs(const char *s)
4178 static const char vstype[VSTYPE + 1][3] = {
4179 "", "}", "-", "+", "?", "=",
4180 "%", "%%", "#", "##"
4181 USE_ASH_BASH_COMPAT(, ":", "/", "//")
4184 const char *p, *str;
4185 char c, cc[2] = " ";
4190 nextc = makestrspace((strlen(s) + 1) * 8, cmdnextc);
4192 while ((c = *p++) != 0) {
4200 if ((subtype & VSTYPE) == VSLENGTH)
4204 if (!(subtype & VSQUOTE) == !(quoted & 1))
4210 str = "\"}" + !(quoted & 1);
4217 case CTLBACKQ+CTLQUOTE:
4220 #if ENABLE_ASH_MATH_SUPPORT
4235 if ((subtype & VSTYPE) != VSNORMAL)
4237 str = vstype[subtype & VSTYPE];
4238 if (subtype & VSNUL)
4247 /* These can only happen inside quotes */
4260 while ((c = *str++)) {
4265 USTPUTC('"', nextc);
4271 /* cmdtxt() and cmdlist() call each other */
4272 static void cmdtxt(union node *n);
4275 cmdlist(union node *np, int sep)
4277 for (; np; np = np->narg.next) {
4281 if (sep && np->narg.next)
4287 cmdtxt(union node *n)
4290 struct nodelist *lp;
4301 lp = n->npipe.cmdlist;
4319 cmdtxt(n->nbinary.ch1);
4335 cmdtxt(n->nif.test);
4338 if (n->nif.elsepart) {
4341 n = n->nif.elsepart;
4357 cmdtxt(n->nbinary.ch1);
4367 cmdputs(n->nfor.var);
4369 cmdlist(n->nfor.args, 1);
4374 cmdputs(n->narg.text);
4378 cmdlist(n->ncmd.args, 1);
4379 cmdlist(n->ncmd.redirect, 0);
4392 cmdputs(n->ncase.expr->narg.text);
4394 for (np = n->ncase.cases; np; np = np->nclist.next) {
4395 cmdtxt(np->nclist.pattern);
4397 cmdtxt(np->nclist.body);
4423 cmdputs(utoa(n->nfile.fd));
4425 if (n->type == NTOFD || n->type == NFROMFD) {
4426 cmdputs(utoa(n->ndup.dupfd));
4435 commandtext(union node *n)
4439 STARTSTACKSTR(cmdnextc);
4441 name = stackblock();
4442 TRACE(("commandtext: name %p, end %p\n\t\"%s\"\n",
4443 name, cmdnextc, cmdnextc));
4444 return ckstrdup(name);
4449 * Fork off a subshell. If we are doing job control, give the subshell its
4450 * own process group. Jp is a job structure that the job is to be added to.
4451 * N is the command that will be evaluated by the child. Both jp and n may
4452 * be NULL. The mode parameter can be one of the following:
4453 * FORK_FG - Fork off a foreground process.
4454 * FORK_BG - Fork off a background process.
4455 * FORK_NOJOB - Like FORK_FG, but don't give the process its own
4456 * process group even if job control is on.
4458 * When job control is turned off, background processes have their standard
4459 * input redirected to /dev/null (except for the second and later processes
4462 * Called with interrupts off.
4465 * Clear traps on a fork.
4472 for (tp = trap; tp < &trap[NSIG]; tp++) {
4473 if (*tp && **tp) { /* trap not NULL or "" (SIG_IGN) */
4478 setsignal(tp - trap);
4484 /* Lives far away from here, needed for forkchild */
4485 static void closescript(void);
4487 /* Called after fork(), in child */
4489 forkchild(struct job *jp, /*union node *n,*/ int mode)
4493 TRACE(("Child shell %d\n", getpid()));
4500 /* do job control only in root shell */
4502 if (mode != FORK_NOJOB && jp->jobctl && !oldlvl) {
4505 if (jp->nprocs == 0)
4508 pgrp = jp->ps[0].pid;
4509 /* This can fail because we are doing it in the parent also */
4510 (void)setpgid(0, pgrp);
4511 if (mode == FORK_FG)
4512 xtcsetpgrp(ttyfd, pgrp);
4517 if (mode == FORK_BG) {
4520 if (jp->nprocs == 0) {
4522 if (open(bb_dev_null, O_RDONLY) != 0)
4523 ash_msg_and_raise_error("can't open %s", bb_dev_null);
4526 if (!oldlvl && iflag) {
4531 for (jp = curjob; jp; jp = jp->prev_job)
4536 /* Called after fork(), in parent */
4538 #define forkparent(jp, n, mode, pid) forkparent(jp, mode, pid)
4541 forkparent(struct job *jp, union node *n, int mode, pid_t pid)
4543 TRACE(("In parent shell: child = %d\n", pid));
4545 while (jobless && dowait(DOWAIT_NONBLOCK, NULL) > 0)
4551 if (mode != FORK_NOJOB && jp->jobctl) {
4554 if (jp->nprocs == 0)
4557 pgrp = jp->ps[0].pid;
4558 /* This can fail because we are doing it in the child also */
4562 if (mode == FORK_BG) {
4563 backgndpid = pid; /* set $! */
4564 set_curjob(jp, CUR_RUNNING);
4567 struct procstat *ps = &jp->ps[jp->nprocs++];
4572 if (doing_jobctl && n)
4573 ps->cmd = commandtext(n);
4579 forkshell(struct job *jp, union node *n, int mode)
4583 TRACE(("forkshell(%%%d, %p, %d) called\n", jobno(jp), n, mode));
4586 TRACE(("Fork failed, errno=%d", errno));
4589 ash_msg_and_raise_error("can't fork");
4592 forkchild(jp, /*n,*/ mode);
4594 forkparent(jp, n, mode, pid);
4599 * Wait for job to finish.
4601 * Under job control we have the problem that while a child process is
4602 * running interrupts generated by the user are sent to the child but not
4603 * to the shell. This means that an infinite loop started by an inter-
4604 * active user may be hard to kill. With job control turned off, an
4605 * interactive user may place an interactive program inside a loop. If
4606 * the interactive program catches interrupts, the user doesn't want
4607 * these interrupts to also abort the loop. The approach we take here
4608 * is to have the shell ignore interrupt signals while waiting for a
4609 * foreground process to terminate, and then send itself an interrupt
4610 * signal if the child process was terminated by an interrupt signal.
4611 * Unfortunately, some programs want to do a bit of cleanup and then
4612 * exit on interrupt; unless these processes terminate themselves by
4613 * sending a signal to themselves (instead of calling exit) they will
4614 * confuse this approach.
4616 * Called with interrupts off.
4619 waitforjob(struct job *jp)
4623 TRACE(("waitforjob(%%%d) called\n", jobno(jp)));
4624 while (jp->state == JOBRUNNING) {
4625 dowait(DOWAIT_BLOCK, jp);
4630 xtcsetpgrp(ttyfd, rootpid);
4632 * This is truly gross.
4633 * If we're doing job control, then we did a TIOCSPGRP which
4634 * caused us (the shell) to no longer be in the controlling
4635 * session -- so we wouldn't have seen any ^C/SIGINT. So, we
4636 * intuit from the subprocess exit status whether a SIGINT
4637 * occurred, and if so interrupt ourselves. Yuck. - mycroft
4639 if (jp->sigint) /* TODO: do the same with all signals */
4640 raise(SIGINT); /* ... by raise(jp->sig) instead? */
4642 if (jp->state == JOBDONE)
4649 * return 1 if there are stopped jobs, otherwise 0
4661 if (jp && jp->state == JOBSTOPPED) {
4662 out2str("You have stopped jobs.\n");
4671 /* ============ redir.c
4673 * Code for dealing with input/output redirection.
4676 #define EMPTY -2 /* marks an unused slot in redirtab */
4677 #define CLOSED -3 /* marks a slot of previously-closed fd */
4680 * Open a file in noclobber mode.
4681 * The code was copied from bash.
4684 noclobberopen(const char *fname)
4687 struct stat finfo, finfo2;
4690 * If the file exists and is a regular file, return an error
4693 r = stat(fname, &finfo);
4694 if (r == 0 && S_ISREG(finfo.st_mode)) {
4700 * If the file was not present (r != 0), make sure we open it
4701 * exclusively so that if it is created before we open it, our open
4702 * will fail. Make sure that we do not truncate an existing file.
4703 * Note that we don't turn on O_EXCL unless the stat failed -- if the
4704 * file was not a regular file, we leave O_EXCL off.
4707 return open(fname, O_WRONLY|O_CREAT|O_EXCL, 0666);
4708 fd = open(fname, O_WRONLY|O_CREAT, 0666);
4710 /* If the open failed, return the file descriptor right away. */
4715 * OK, the open succeeded, but the file may have been changed from a
4716 * non-regular file to a regular file between the stat and the open.
4717 * We are assuming that the O_EXCL open handles the case where FILENAME
4718 * did not exist and is symlinked to an existing file between the stat
4723 * If we can open it and fstat the file descriptor, and neither check
4724 * revealed that it was a regular file, and the file has not been
4725 * replaced, return the file descriptor.
4727 if (fstat(fd, &finfo2) == 0 && !S_ISREG(finfo2.st_mode)
4728 && finfo.st_dev == finfo2.st_dev && finfo.st_ino == finfo2.st_ino)
4731 /* The file has been replaced. badness. */
4738 * Handle here documents. Normally we fork off a process to write the
4739 * data to a pipe. If the document is short, we can stuff the data in
4740 * the pipe without forking.
4742 /* openhere needs this forward reference */
4743 static void expandhere(union node *arg, int fd);
4745 openhere(union node *redir)
4751 ash_msg_and_raise_error("pipe call failed");
4752 if (redir->type == NHERE) {
4753 len = strlen(redir->nhere.doc->narg.text);
4754 if (len <= PIPE_BUF) {
4755 full_write(pip[1], redir->nhere.doc->narg.text, len);
4759 if (forkshell((struct job *)NULL, (union node *)NULL, FORK_NOJOB) == 0) {
4762 signal(SIGINT, SIG_IGN);
4763 signal(SIGQUIT, SIG_IGN);
4764 signal(SIGHUP, SIG_IGN);
4766 signal(SIGTSTP, SIG_IGN);
4768 signal(SIGPIPE, SIG_DFL);
4769 if (redir->type == NHERE)
4770 full_write(pip[1], redir->nhere.doc->narg.text, len);
4772 expandhere(redir->nhere.doc, pip[1]);
4773 _exit(EXIT_SUCCESS);
4781 openredirect(union node *redir)
4786 switch (redir->nfile.type) {
4788 fname = redir->nfile.expfname;
4789 f = open(fname, O_RDONLY);
4794 fname = redir->nfile.expfname;
4795 f = open(fname, O_RDWR|O_CREAT|O_TRUNC, 0666);
4800 /* Take care of noclobber mode. */
4802 fname = redir->nfile.expfname;
4803 f = noclobberopen(fname);
4810 fname = redir->nfile.expfname;
4811 f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666);
4816 fname = redir->nfile.expfname;
4817 f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666);
4825 /* Fall through to eliminate warning. */
4826 /* Our single caller does this itself */
4833 f = openhere(redir);
4839 ash_msg_and_raise_error("can't create %s: %s", fname, errmsg(errno, "nonexistent directory"));
4841 ash_msg_and_raise_error("can't open %s: %s", fname, errmsg(errno, "no such file"));
4845 * Copy a file descriptor to be >= to. Returns -1
4846 * if the source file descriptor is closed, EMPTY if there are no unused
4847 * file descriptors left.
4849 /* 0x800..00: bit to set in "to" to request dup2 instead of fcntl(F_DUPFD).
4850 * old code was doing close(to) prior to copyfd() to achieve the same */
4852 COPYFD_EXACT = (int)~(INT_MAX),
4853 COPYFD_RESTORE = (int)((unsigned)COPYFD_EXACT >> 1),
4856 copyfd(int from, int to)
4860 if (to & COPYFD_EXACT) {
4861 to &= ~COPYFD_EXACT;
4863 newfd = dup2(from, to);
4865 newfd = fcntl(from, F_DUPFD, to);
4868 if (errno == EMFILE)
4870 /* Happens when source fd is not open: try "echo >&99" */
4871 ash_msg_and_raise_error("%d: %m", from);
4876 /* Struct def and variable are moved down to the first usage site */
4881 struct redirtab *next;
4884 struct two_fd_t two_fd[0];
4886 #define redirlist (G_var.redirlist)
4888 static int need_to_remember(struct redirtab *rp, int fd)
4892 if (!rp) /* 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 = 0, q = gotsig; i < NSIG - 1; 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 void (*evalfn)(union node *, int);
7889 TRACE(("evaltree(NULL) called\n"));
7892 TRACE(("pid %d, evaltree(%p: %d, %d) called\n",
7893 getpid(), n, n->type, flags));
7897 out1fmt("Node type = %d\n", n->type);
7902 evaltree(n->nnot.com, EV_TESTED);
7903 status = !exitstatus;
7906 expredir(n->nredir.redirect);
7907 status = redirectsafe(n->nredir.redirect, REDIR_PUSH);
7909 evaltree(n->nredir.n, flags & EV_TESTED);
7910 status = exitstatus;
7915 evalfn = evalcommand;
7917 if (eflag && !(flags & EV_TESTED))
7929 evalfn = evalsubshell;
7941 #error NAND + 1 != NOR
7943 #if NOR + 1 != NSEMI
7944 #error NOR + 1 != NSEMI
7946 isor = n->type - NAND;
7949 (flags | ((isor >> 1) - 1)) & EV_TESTED
7951 if (!exitstatus == isor)
7963 evaltree(n->nif.test, EV_TESTED);
7966 if (exitstatus == 0) {
7969 } else if (n->nif.elsepart) {
7970 n = n->nif.elsepart;
7975 defun(n->narg.text, n->narg.next);
7979 exitstatus = status;
7983 if ((checkexit & exitstatus))
7984 evalskip |= SKIPEVAL;
7985 else if (pendingsig && dotrap())
7988 if (flags & EV_EXIT) {
7990 raise_exception(EXEXIT);
7994 #if !defined(__alpha__) || (defined(__GNUC__) && __GNUC__ >= 3)
7997 void evaltreenr(union node *, int) __attribute__ ((alias("evaltree"),__noreturn__));
8000 evalloop(union node *n, int flags)
8010 evaltree(n->nbinary.ch1, EV_TESTED);
8013 if (evalskip == SKIPCONT && --skipcount <= 0) {
8017 if (evalskip == SKIPBREAK && --skipcount <= 0)
8022 if (n->type != NWHILE)
8026 evaltree(n->nbinary.ch2, flags);
8027 status = exitstatus;
8032 exitstatus = status;
8036 evalfor(union node *n, int flags)
8038 struct arglist arglist;
8041 struct stackmark smark;
8043 setstackmark(&smark);
8044 arglist.list = NULL;
8045 arglist.lastp = &arglist.list;
8046 for (argp = n->nfor.args; argp; argp = argp->narg.next) {
8047 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE | EXP_RECORD);
8052 *arglist.lastp = NULL;
8057 for (sp = arglist.list; sp; sp = sp->next) {
8058 setvar(n->nfor.var, sp->text, 0);
8059 evaltree(n->nfor.body, flags);
8061 if (evalskip == SKIPCONT && --skipcount <= 0) {
8065 if (evalskip == SKIPBREAK && --skipcount <= 0)
8072 popstackmark(&smark);
8076 evalcase(union node *n, int flags)
8080 struct arglist arglist;
8081 struct stackmark smark;
8083 setstackmark(&smark);
8084 arglist.list = NULL;
8085 arglist.lastp = &arglist.list;
8086 expandarg(n->ncase.expr, &arglist, EXP_TILDE);
8088 for (cp = n->ncase.cases; cp && evalskip == 0; cp = cp->nclist.next) {
8089 for (patp = cp->nclist.pattern; patp; patp = patp->narg.next) {
8090 if (casematch(patp, arglist.list->text)) {
8091 if (evalskip == 0) {
8092 evaltree(cp->nclist.body, flags);
8099 popstackmark(&smark);
8103 * Kick off a subshell to evaluate a tree.
8106 evalsubshell(union node *n, int flags)
8109 int backgnd = (n->type == NBACKGND);
8112 expredir(n->nredir.redirect);
8113 if (!backgnd && flags & EV_EXIT && !trap[0])
8116 jp = makejob(/*n,*/ 1);
8117 if (forkshell(jp, n, backgnd) == 0) {
8121 flags &=~ EV_TESTED;
8123 redirect(n->nredir.redirect, 0);
8124 evaltreenr(n->nredir.n, flags);
8129 status = waitforjob(jp);
8130 exitstatus = status;
8135 * Compute the names of the files in a redirection list.
8137 static void fixredir(union node *, const char *, int);
8139 expredir(union node *n)
8143 for (redir = n; redir; redir = redir->nfile.next) {
8147 fn.lastp = &fn.list;
8148 switch (redir->type) {
8154 expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR);
8155 redir->nfile.expfname = fn.list->text;
8159 if (redir->ndup.vname) {
8160 expandarg(redir->ndup.vname, &fn, EXP_FULL | EXP_TILDE);
8161 if (fn.list == NULL)
8162 ash_msg_and_raise_error("redir error");
8163 fixredir(redir, fn.list->text, 1);
8171 * Evaluate a pipeline. All the processes in the pipeline are children
8172 * of the process creating the pipeline. (This differs from some versions
8173 * of the shell, which make the last process in a pipeline the parent
8177 evalpipe(union node *n, int flags)
8180 struct nodelist *lp;
8185 TRACE(("evalpipe(0x%lx) called\n", (long)n));
8187 for (lp = n->npipe.cmdlist; lp; lp = lp->next)
8191 jp = makejob(/*n,*/ pipelen);
8193 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
8197 if (pipe(pip) < 0) {
8199 ash_msg_and_raise_error("pipe call failed");
8202 if (forkshell(jp, lp->n, n->npipe.pipe_backgnd) == 0) {
8215 evaltreenr(lp->n, flags);
8223 if (n->npipe.pipe_backgnd == 0) {
8224 exitstatus = waitforjob(jp);
8225 TRACE(("evalpipe: job done exit status %d\n", exitstatus));
8231 * Controls whether the shell is interactive or not.
8234 setinteractive(int on)
8236 static smallint is_interactive;
8238 if (++on == is_interactive)
8240 is_interactive = on;
8244 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
8245 if (is_interactive > 1) {
8246 /* Looks like they want an interactive shell */
8247 static smallint did_banner;
8252 "%s built-in shell (ash)\n"
8253 "Enter 'help' for a list of built-in commands."
8268 setinteractive(iflag);
8270 #if ENABLE_FEATURE_EDITING_VI
8272 line_input_state->flags |= VI_MODE;
8274 line_input_state->flags &= ~VI_MODE;
8276 viflag = 0; /* forcibly keep the option off */
8280 static struct localvar *localvars;
8283 * Called after a function returns.
8284 * Interrupts must be off.
8289 struct localvar *lvp;
8292 while ((lvp = localvars) != NULL) {
8293 localvars = lvp->next;
8295 TRACE(("poplocalvar %s", vp ? vp->text : "-"));
8296 if (vp == NULL) { /* $- saved */
8297 memcpy(optlist, lvp->text, sizeof(optlist));
8298 free((char*)lvp->text);
8300 } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) {
8304 (*vp->func)(strchrnul(lvp->text, '=') + 1);
8305 if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
8306 free((char*)vp->text);
8307 vp->flags = lvp->flags;
8308 vp->text = lvp->text;
8315 evalfun(struct funcnode *func, int argc, char **argv, int flags)
8317 volatile struct shparam saveparam;
8318 struct localvar *volatile savelocalvars;
8319 struct jmploc *volatile savehandler;
8320 struct jmploc jmploc;
8323 saveparam = shellparam;
8324 savelocalvars = localvars;
8325 e = setjmp(jmploc.loc);
8330 savehandler = exception_handler;
8331 exception_handler = &jmploc;
8333 shellparam.malloced = 0;
8337 shellparam.nparam = argc - 1;
8338 shellparam.p = argv + 1;
8339 #if ENABLE_ASH_GETOPTS
8340 shellparam.optind = 1;
8341 shellparam.optoff = -1;
8343 evaltree(&func->n, flags & EV_TESTED);
8349 localvars = savelocalvars;
8350 freeparam(&shellparam);
8351 shellparam = saveparam;
8352 exception_handler = savehandler;
8354 evalskip &= ~SKIPFUNC;
8358 #if ENABLE_ASH_CMDCMD
8360 parse_command_args(char **argv, const char **path)
8373 if (c == '-' && !*cp) {
8380 *path = bb_default_path;
8383 /* run 'typecmd' for other options */
8394 * Make a variable a local variable. When a variable is made local, it's
8395 * value and flags are saved in a localvar structure. The saved values
8396 * will be restored when the shell function returns. We handle the name
8397 * "-" as a special case.
8402 struct localvar *lvp;
8407 lvp = ckzalloc(sizeof(struct localvar));
8408 if (LONE_DASH(name)) {
8410 p = ckmalloc(sizeof(optlist));
8411 lvp->text = memcpy(p, optlist, sizeof(optlist));
8416 vpp = hashvar(name);
8417 vp = *findvar(vpp, name);
8418 eq = strchr(name, '=');
8421 setvareq(name, VSTRFIXED);
8423 setvar(name, NULL, VSTRFIXED);
8424 vp = *vpp; /* the new variable */
8425 lvp->flags = VUNSET;
8427 lvp->text = vp->text;
8428 lvp->flags = vp->flags;
8429 vp->flags |= VSTRFIXED|VTEXTFIXED;
8435 lvp->next = localvars;
8441 * The "local" command.
8444 localcmd(int argc UNUSED_PARAM, char **argv)
8449 while ((name = *argv++) != NULL) {
8456 falsecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
8462 truecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
8468 execcmd(int argc UNUSED_PARAM, char **argv)
8471 iflag = 0; /* exit on error */
8474 shellexec(argv + 1, pathval(), 0);
8480 * The return command.
8483 returncmd(int argc UNUSED_PARAM, char **argv)
8486 * If called outside a function, do what ksh does;
8487 * skip the rest of the file.
8489 evalskip = funcnest ? SKIPFUNC : SKIPFILE;
8490 return argv[1] ? number(argv[1]) : exitstatus;
8493 /* Forward declarations for builtintab[] */
8494 static int breakcmd(int, char **);
8495 static int dotcmd(int, char **);
8496 static int evalcmd(int, char **);
8497 static int exitcmd(int, char **);
8498 static int exportcmd(int, char **);
8499 #if ENABLE_ASH_GETOPTS
8500 static int getoptscmd(int, char **);
8502 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
8503 static int helpcmd(int, char **);
8505 #if ENABLE_ASH_MATH_SUPPORT
8506 static int letcmd(int, char **);
8508 static int readcmd(int, char **);
8509 static int setcmd(int, char **);
8510 static int shiftcmd(int, char **);
8511 static int timescmd(int, char **);
8512 static int trapcmd(int, char **);
8513 static int umaskcmd(int, char **);
8514 static int unsetcmd(int, char **);
8515 static int ulimitcmd(int, char **);
8517 #define BUILTIN_NOSPEC "0"
8518 #define BUILTIN_SPECIAL "1"
8519 #define BUILTIN_REGULAR "2"
8520 #define BUILTIN_SPEC_REG "3"
8521 #define BUILTIN_ASSIGN "4"
8522 #define BUILTIN_SPEC_ASSG "5"
8523 #define BUILTIN_REG_ASSG "6"
8524 #define BUILTIN_SPEC_REG_ASSG "7"
8526 /* We do not handle [[ expr ]] bashism bash-compatibly,
8527 * we make it a synonym of [ expr ].
8528 * Basically, word splitting and pathname expansion should NOT be performed
8530 * no word splitting: a="a b"; [[ $a = "a b" ]]; echo $? should print "0"
8531 * no pathname expansion: [[ /bin/m* = "/bin/m*" ]]; echo $? should print "0"
8532 * Additional operators:
8533 * || and && should work as -o and -a
8535 * Apart from the above, [[ expr ]] should work as [ expr ]
8538 #define echocmd echo_main
8539 #define printfcmd printf_main
8540 #define testcmd test_main
8542 /* Keep these in proper order since it is searched via bsearch() */
8543 static const struct builtincmd builtintab[] = {
8544 { BUILTIN_SPEC_REG ".", dotcmd },
8545 { BUILTIN_SPEC_REG ":", truecmd },
8546 #if ENABLE_ASH_BUILTIN_TEST
8547 { BUILTIN_REGULAR "[", testcmd },
8548 #if ENABLE_ASH_BASH_COMPAT
8549 { BUILTIN_REGULAR "[[", testcmd },
8552 #if ENABLE_ASH_ALIAS
8553 { BUILTIN_REG_ASSG "alias", aliascmd },
8556 { BUILTIN_REGULAR "bg", fg_bgcmd },
8558 { BUILTIN_SPEC_REG "break", breakcmd },
8559 { BUILTIN_REGULAR "cd", cdcmd },
8560 { BUILTIN_NOSPEC "chdir", cdcmd },
8561 #if ENABLE_ASH_CMDCMD
8562 { BUILTIN_REGULAR "command", commandcmd },
8564 { BUILTIN_SPEC_REG "continue", breakcmd },
8565 #if ENABLE_ASH_BUILTIN_ECHO
8566 { BUILTIN_REGULAR "echo", echocmd },
8568 { BUILTIN_SPEC_REG "eval", evalcmd },
8569 { BUILTIN_SPEC_REG "exec", execcmd },
8570 { BUILTIN_SPEC_REG "exit", exitcmd },
8571 { BUILTIN_SPEC_REG_ASSG "export", exportcmd },
8572 { BUILTIN_REGULAR "false", falsecmd },
8574 { BUILTIN_REGULAR "fg", fg_bgcmd },
8576 #if ENABLE_ASH_GETOPTS
8577 { BUILTIN_REGULAR "getopts", getoptscmd },
8579 { BUILTIN_NOSPEC "hash", hashcmd },
8580 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
8581 { BUILTIN_NOSPEC "help", helpcmd },
8584 { BUILTIN_REGULAR "jobs", jobscmd },
8585 { BUILTIN_REGULAR "kill", killcmd },
8587 #if ENABLE_ASH_MATH_SUPPORT
8588 { BUILTIN_NOSPEC "let", letcmd },
8590 { BUILTIN_ASSIGN "local", localcmd },
8591 #if ENABLE_ASH_BUILTIN_PRINTF
8592 { BUILTIN_REGULAR "printf", printfcmd },
8594 { BUILTIN_NOSPEC "pwd", pwdcmd },
8595 { BUILTIN_REGULAR "read", readcmd },
8596 { BUILTIN_SPEC_REG_ASSG "readonly", exportcmd },
8597 { BUILTIN_SPEC_REG "return", returncmd },
8598 { BUILTIN_SPEC_REG "set", setcmd },
8599 { BUILTIN_SPEC_REG "shift", shiftcmd },
8600 { BUILTIN_SPEC_REG "source", dotcmd },
8601 #if ENABLE_ASH_BUILTIN_TEST
8602 { BUILTIN_REGULAR "test", testcmd },
8604 { BUILTIN_SPEC_REG "times", timescmd },
8605 { BUILTIN_SPEC_REG "trap", trapcmd },
8606 { BUILTIN_REGULAR "true", truecmd },
8607 { BUILTIN_NOSPEC "type", typecmd },
8608 { BUILTIN_NOSPEC "ulimit", ulimitcmd },
8609 { BUILTIN_REGULAR "umask", umaskcmd },
8610 #if ENABLE_ASH_ALIAS
8611 { BUILTIN_REGULAR "unalias", unaliascmd },
8613 { BUILTIN_SPEC_REG "unset", unsetcmd },
8614 { BUILTIN_REGULAR "wait", waitcmd },
8617 /* Should match the above table! */
8618 #define COMMANDCMD (builtintab + \
8620 1 * ENABLE_ASH_BUILTIN_TEST + \
8621 1 * ENABLE_ASH_BUILTIN_TEST * ENABLE_ASH_BASH_COMPAT + \
8622 1 * ENABLE_ASH_ALIAS + \
8623 1 * ENABLE_ASH_JOB_CONTROL + \
8625 #define EXECCMD (builtintab + \
8627 1 * ENABLE_ASH_BUILTIN_TEST + \
8628 1 * ENABLE_ASH_BUILTIN_TEST * ENABLE_ASH_BASH_COMPAT + \
8629 1 * ENABLE_ASH_ALIAS + \
8630 1 * ENABLE_ASH_JOB_CONTROL + \
8632 1 * ENABLE_ASH_CMDCMD + \
8634 ENABLE_ASH_BUILTIN_ECHO + \
8638 * Search the table of builtin commands.
8640 static struct builtincmd *
8641 find_builtin(const char *name)
8643 struct builtincmd *bp;
8646 name, builtintab, ARRAY_SIZE(builtintab), sizeof(builtintab[0]),
8653 * Execute a simple command.
8656 isassignment(const char *p)
8658 const char *q = endofname(p);
8664 bltincmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
8666 /* Preserve exitstatus of a previous possible redirection
8667 * as POSIX mandates */
8668 return back_exitstatus;
8671 evalcommand(union node *cmd, int flags)
8673 static const struct builtincmd null_bltin = {
8674 "\0\0", bltincmd /* why three NULs? */
8676 struct stackmark smark;
8678 struct arglist arglist;
8679 struct arglist varlist;
8682 const struct strlist *sp;
8683 struct cmdentry cmdentry;
8691 struct builtincmd *bcmd;
8692 int pseudovarflag = 0;
8694 /* First expand the arguments. */
8695 TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags));
8696 setstackmark(&smark);
8697 back_exitstatus = 0;
8699 cmdentry.cmdtype = CMDBUILTIN;
8700 cmdentry.u.cmd = &null_bltin;
8701 varlist.lastp = &varlist.list;
8702 *varlist.lastp = NULL;
8703 arglist.lastp = &arglist.list;
8704 *arglist.lastp = NULL;
8707 if (cmd->ncmd.args) {
8708 bcmd = find_builtin(cmd->ncmd.args->narg.text);
8709 pseudovarflag = bcmd && IS_BUILTIN_ASSIGN(bcmd);
8712 for (argp = cmd->ncmd.args; argp; argp = argp->narg.next) {
8713 struct strlist **spp;
8715 spp = arglist.lastp;
8716 if (pseudovarflag && isassignment(argp->narg.text))
8717 expandarg(argp, &arglist, EXP_VARTILDE);
8719 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
8721 for (sp = *spp; sp; sp = sp->next)
8725 argv = nargv = stalloc(sizeof(char *) * (argc + 1));
8726 for (sp = arglist.list; sp; sp = sp->next) {
8727 TRACE(("evalcommand arg: %s\n", sp->text));
8728 *nargv++ = sp->text;
8733 if (iflag && funcnest == 0 && argc > 0)
8734 lastarg = nargv[-1];
8737 expredir(cmd->ncmd.redirect);
8738 status = redirectsafe(cmd->ncmd.redirect, REDIR_PUSH | REDIR_SAVEFD2);
8741 for (argp = cmd->ncmd.assign; argp; argp = argp->narg.next) {
8742 struct strlist **spp;
8745 spp = varlist.lastp;
8746 expandarg(argp, &varlist, EXP_VARTILDE);
8749 * Modify the command lookup path, if a PATH= assignment
8753 if (varequal(p, path))
8757 /* Print the command if xflag is set. */
8760 const char *p = " %s";
8763 fdprintf(preverrout_fd, p, expandstr(ps4val()));
8766 for (n = 0; n < 2; n++) {
8768 fdprintf(preverrout_fd, p, sp->text);
8776 safe_write(preverrout_fd, "\n", 1);
8782 /* Now locate the command. */
8784 const char *oldpath;
8785 int cmd_flag = DO_ERR;
8790 find_command(argv[0], &cmdentry, cmd_flag, path);
8791 if (cmdentry.cmdtype == CMDUNKNOWN) {
8797 /* implement bltin and command here */
8798 if (cmdentry.cmdtype != CMDBUILTIN)
8801 spclbltin = IS_BUILTIN_SPECIAL(cmdentry.u.cmd);
8802 if (cmdentry.u.cmd == EXECCMD)
8804 #if ENABLE_ASH_CMDCMD
8805 if (cmdentry.u.cmd == COMMANDCMD) {
8807 nargv = parse_command_args(argv, &path);
8810 argc -= nargv - argv;
8812 cmd_flag |= DO_NOFUNC;
8820 /* We have a redirection error. */
8822 raise_exception(EXERROR);
8824 exitstatus = status;
8828 /* Execute the command. */
8829 switch (cmdentry.cmdtype) {
8831 #if ENABLE_FEATURE_SH_NOFORK
8833 /* find_command() encodes applet_no as (-2 - applet_no) */
8834 int applet_no = (- cmdentry.u.index - 2);
8835 if (applet_no >= 0 && APPLET_IS_NOFORK(applet_no)) {
8836 listsetvar(varlist.list, VEXPORT|VSTACK);
8837 /* run <applet>_main() */
8838 exitstatus = run_nofork_applet(applet_no, argv);
8844 /* Fork off a child process if necessary. */
8845 if (!(flags & EV_EXIT) || trap[0]) {
8847 jp = makejob(/*cmd,*/ 1);
8848 if (forkshell(jp, cmd, FORK_FG) != 0) {
8849 exitstatus = waitforjob(jp);
8855 listsetvar(varlist.list, VEXPORT|VSTACK);
8856 shellexec(argv, path, cmdentry.u.index);
8860 cmdenviron = varlist.list;
8862 struct strlist *list = cmdenviron;
8864 if (spclbltin > 0 || argc == 0) {
8866 if (cmd_is_exec && argc > 1)
8869 listsetvar(list, i);
8871 if (evalbltin(cmdentry.u.cmd, argc, argv)) {
8878 exit_status = 128 + SIGINT;
8880 exit_status = 128 + pendingsig;
8881 exitstatus = exit_status;
8882 if (i == EXINT || spclbltin > 0) {
8884 longjmp(exception_handler->loc, 1);
8891 listsetvar(varlist.list, 0);
8892 if (evalfun(cmdentry.u.func, argc, argv, flags))
8898 popredir(cmd_is_exec);
8900 /* dsl: I think this is intended to be used to support
8901 * '_' in 'vi' command mode during line editing...
8902 * However I implemented that within libedit itself.
8904 setvar("_", lastarg, 0);
8906 popstackmark(&smark);
8910 evalbltin(const struct builtincmd *cmd, int argc, char **argv)
8912 char *volatile savecmdname;
8913 struct jmploc *volatile savehandler;
8914 struct jmploc jmploc;
8917 savecmdname = commandname;
8918 i = setjmp(jmploc.loc);
8921 savehandler = exception_handler;
8922 exception_handler = &jmploc;
8923 commandname = argv[0];
8925 optptr = NULL; /* initialize nextopt */
8926 exitstatus = (*cmd->builtin)(argc, argv);
8927 flush_stdout_stderr();
8929 exitstatus |= ferror(stdout);
8931 commandname = savecmdname;
8933 exception_handler = savehandler;
8939 goodname(const char *p)
8941 return !*endofname(p);
8946 * Search for a command. This is called before we fork so that the
8947 * location of the command will be available in the parent as well as
8948 * the child. The check for "goodname" is an overly conservative
8949 * check that the name will not be subject to expansion.
8952 prehash(union node *n)
8954 struct cmdentry entry;
8956 if (n->type == NCMD && n->ncmd.args && goodname(n->ncmd.args->narg.text))
8957 find_command(n->ncmd.args->narg.text, &entry, 0, pathval());
8961 /* ============ Builtin commands
8963 * Builtin commands whose functions are closely tied to evaluation
8964 * are implemented here.
8968 * Handle break and continue commands. Break, continue, and return are
8969 * all handled by setting the evalskip flag. The evaluation routines
8970 * above all check this flag, and if it is set they start skipping
8971 * commands rather than executing them. The variable skipcount is
8972 * the number of loops to break/continue, or the number of function
8973 * levels to return. (The latter is always 1.) It should probably
8974 * be an error to break out of more loops than exist, but it isn't
8975 * in the standard shell so we don't make it one here.
8978 breakcmd(int argc UNUSED_PARAM, char **argv)
8980 int n = argv[1] ? number(argv[1]) : 1;
8983 ash_msg_and_raise_error(illnum, argv[1]);
8987 evalskip = (**argv == 'c') ? SKIPCONT : SKIPBREAK;
8994 /* ============ input.c
8996 * This implements the input routines used by the parser.
8999 #define EOF_NLEFT -99 /* value of parsenleft when EOF pushed back */
9002 INPUT_PUSH_FILE = 1,
9003 INPUT_NOFILE_OK = 2,
9006 static int plinno = 1; /* input line number */
9007 /* number of characters left in input buffer */
9008 static int parsenleft; /* copy of parsefile->nleft */
9009 static int parselleft; /* copy of parsefile->lleft */
9010 /* next character in input buffer */
9011 static char *parsenextc; /* copy of parsefile->nextc */
9013 static smallint checkkwd;
9014 /* values of checkkwd variable */
9015 #define CHKALIAS 0x1
9022 struct strpush *sp = g_parsefile->strpush;
9025 #if ENABLE_ASH_ALIAS
9027 if (parsenextc[-1] == ' ' || parsenextc[-1] == '\t') {
9028 checkkwd |= CHKALIAS;
9030 if (sp->string != sp->ap->val) {
9033 sp->ap->flag &= ~ALIASINUSE;
9034 if (sp->ap->flag & ALIASDEAD) {
9035 unalias(sp->ap->name);
9039 parsenextc = sp->prevstring;
9040 parsenleft = sp->prevnleft;
9041 /*dprintf("*** calling popstring: restoring to '%s'\n", parsenextc);*/
9042 g_parsefile->strpush = sp->prev;
9043 if (sp != &(g_parsefile->basestrpush))
9052 char *buf = g_parsefile->buf;
9055 #if ENABLE_FEATURE_EDITING
9057 if (!iflag || g_parsefile->fd)
9058 nr = nonblock_safe_read(g_parsefile->fd, buf, BUFSIZ - 1);
9060 #if ENABLE_FEATURE_TAB_COMPLETION
9061 line_input_state->path_lookup = pathval();
9063 nr = read_line_input(cmdedit_prompt, buf, BUFSIZ, line_input_state);
9065 /* Ctrl+C pressed */
9074 if (nr < 0 && errno == 0) {
9075 /* Ctrl+D pressed */
9080 nr = nonblock_safe_read(g_parsefile->fd, buf, BUFSIZ - 1);
9084 /* nonblock_safe_read() handles this problem */
9086 if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
9087 int flags = fcntl(0, F_GETFL);
9088 if (flags >= 0 && (flags & O_NONBLOCK)) {
9089 flags &= ~O_NONBLOCK;
9090 if (fcntl(0, F_SETFL, flags) >= 0) {
9091 out2str("sh: turning off NDELAY mode\n");
9102 * Refill the input buffer and return the next input character:
9104 * 1) If a string was pushed back on the input, pop it;
9105 * 2) If an EOF was pushed back (parsenleft == EOF_NLEFT) or we are reading
9106 * from a string so we can't refill the buffer, return EOF.
9107 * 3) If the is more stuff in this buffer, use it else call read to fill it.
9108 * 4) Process input up to the next newline, deleting nul characters.
9117 while (g_parsefile->strpush) {
9118 #if ENABLE_ASH_ALIAS
9119 if (parsenleft == -1 && g_parsefile->strpush->ap &&
9120 parsenextc[-1] != ' ' && parsenextc[-1] != '\t') {
9125 if (--parsenleft >= 0)
9126 return signed_char2int(*parsenextc++);
9128 if (parsenleft == EOF_NLEFT || g_parsefile->buf == NULL)
9130 flush_stdout_stderr();
9137 parselleft = parsenleft = EOF_NLEFT;
9144 /* delete nul characters */
9152 memmove(q, q + 1, more);
9156 parsenleft = q - parsenextc - 1;
9162 parsenleft = q - parsenextc - 1;
9174 out2str(parsenextc);
9179 return signed_char2int(*parsenextc++);
9182 #define pgetc_as_macro() (--parsenleft >= 0? signed_char2int(*parsenextc++) : preadbuffer())
9186 return pgetc_as_macro();
9189 #if ENABLE_ASH_OPTIMIZE_FOR_SIZE
9190 #define pgetc_macro() pgetc()
9192 #define pgetc_macro() pgetc_as_macro()
9196 * Same as pgetc(), but ignores PEOA.
9198 #if ENABLE_ASH_ALIAS
9206 } while (c == PEOA);
9213 return pgetc_macro();
9218 * Read a line from the script.
9221 pfgets(char *line, int len)
9227 while (--nleft > 0) {
9243 * Undo the last call to pgetc. Only one character may be pushed back.
9244 * PEOF may be pushed back.
9254 * Push a string back onto the input at this current parsefile level.
9255 * We handle aliases this way.
9257 #if !ENABLE_ASH_ALIAS
9258 #define pushstring(s, ap) pushstring(s)
9261 pushstring(char *s, struct alias *ap)
9268 /*dprintf("*** calling pushstring: %s, %d\n", s, len);*/
9269 if (g_parsefile->strpush) {
9270 sp = ckzalloc(sizeof(struct strpush));
9271 sp->prev = g_parsefile->strpush;
9272 g_parsefile->strpush = sp;
9274 sp = g_parsefile->strpush = &(g_parsefile->basestrpush);
9275 sp->prevstring = parsenextc;
9276 sp->prevnleft = parsenleft;
9277 #if ENABLE_ASH_ALIAS
9280 ap->flag |= ALIASINUSE;
9290 * To handle the "." command, a stack of input files is used. Pushfile
9291 * adds a new entry to the stack and popfile restores the previous level.
9296 struct parsefile *pf;
9298 g_parsefile->nleft = parsenleft;
9299 g_parsefile->lleft = parselleft;
9300 g_parsefile->nextc = parsenextc;
9301 g_parsefile->linno = plinno;
9302 pf = ckzalloc(sizeof(*pf));
9303 pf->prev = g_parsefile;
9305 /*pf->strpush = NULL; - ckzalloc did it */
9306 /*pf->basestrpush.prev = NULL;*/
9313 struct parsefile *pf = g_parsefile;
9321 g_parsefile = pf->prev;
9323 parsenleft = g_parsefile->nleft;
9324 parselleft = g_parsefile->lleft;
9325 parsenextc = g_parsefile->nextc;
9326 plinno = g_parsefile->linno;
9331 * Return to top level.
9336 while (g_parsefile != &basepf)
9341 * Close the file(s) that the shell is reading commands from. Called
9342 * after a fork is done.
9348 if (g_parsefile->fd > 0) {
9349 close(g_parsefile->fd);
9350 g_parsefile->fd = 0;
9355 * Like setinputfile, but takes an open file descriptor. Call this with
9359 setinputfd(int fd, int push)
9361 close_on_exec_on(fd);
9364 g_parsefile->buf = 0;
9366 g_parsefile->fd = fd;
9367 if (g_parsefile->buf == NULL)
9368 g_parsefile->buf = ckmalloc(IBUFSIZ);
9369 parselleft = parsenleft = 0;
9374 * Set the input to take input from a file. If push is set, push the
9375 * old input onto the stack first.
9378 setinputfile(const char *fname, int flags)
9384 fd = open(fname, O_RDONLY);
9386 if (flags & INPUT_NOFILE_OK)
9388 ash_msg_and_raise_error("can't open %s", fname);
9391 fd2 = copyfd(fd, 10);
9394 ash_msg_and_raise_error("out of file descriptors");
9397 setinputfd(fd, flags & INPUT_PUSH_FILE);
9404 * Like setinputfile, but takes input from a string.
9407 setinputstring(char *string)
9411 parsenextc = string;
9412 parsenleft = strlen(string);
9413 g_parsefile->buf = NULL;
9419 /* ============ mail.c
9421 * Routines to check for mail.
9426 #define MAXMBOXES 10
9428 /* times of mailboxes */
9429 static time_t mailtime[MAXMBOXES];
9430 /* Set if MAIL or MAILPATH is changed. */
9431 static smallint mail_var_path_changed;
9434 * Print appropriate message(s) if mail has arrived.
9435 * If mail_var_path_changed is set,
9436 * then the value of MAIL has mail_var_path_changed,
9437 * so we just update the values.
9446 struct stackmark smark;
9449 setstackmark(&smark);
9450 mpath = mpathset() ? mpathval() : mailval();
9451 for (mtp = mailtime; mtp < mailtime + MAXMBOXES; mtp++) {
9452 p = padvance(&mpath, nullstr);
9457 for (q = p; *q; q++)
9463 q[-1] = '\0'; /* delete trailing '/' */
9464 if (stat(p, &statb) < 0) {
9468 if (!mail_var_path_changed && statb.st_mtime != *mtp) {
9471 pathopt ? pathopt : "you have mail"
9474 *mtp = statb.st_mtime;
9476 mail_var_path_changed = 0;
9477 popstackmark(&smark);
9481 changemail(const char *val UNUSED_PARAM)
9483 mail_var_path_changed = 1;
9486 #endif /* ASH_MAIL */
9489 /* ============ ??? */
9492 * Set the shell parameters.
9495 setparam(char **argv)
9501 for (nparam = 0; argv[nparam]; nparam++)
9503 ap = newparam = ckmalloc((nparam + 1) * sizeof(*ap));
9505 *ap++ = ckstrdup(*argv++);
9508 freeparam(&shellparam);
9509 shellparam.malloced = 1;
9510 shellparam.nparam = nparam;
9511 shellparam.p = newparam;
9512 #if ENABLE_ASH_GETOPTS
9513 shellparam.optind = 1;
9514 shellparam.optoff = -1;
9519 * Process shell options. The global variable argptr contains a pointer
9520 * to the argument list; we advance it past the options.
9522 * SUSv3 section 2.8.1 "Consequences of Shell Errors" says:
9523 * For a non-interactive shell, an error condition encountered
9524 * by a special built-in ... shall cause the shell to write a diagnostic message
9525 * to standard error and exit as shown in the following table:
9526 * Error Special Built-In
9528 * Utility syntax error (option or operand error) Shall exit
9530 * However, in bug 1142 (http://busybox.net/bugs/view.php?id=1142)
9531 * we see that bash does not do that (set "finishes" with error code 1 instead,
9532 * and shell continues), and people rely on this behavior!
9534 * set -o barfoo 2>/dev/null
9537 * Oh well. Let's mimic that.
9540 plus_minus_o(char *name, int val)
9545 for (i = 0; i < NOPTS; i++) {
9546 if (strcmp(name, optnames(i)) == 0) {
9551 ash_msg("illegal option %co %s", val ? '-' : '+', name);
9554 for (i = 0; i < NOPTS; i++) {
9556 out1fmt("%-16s%s\n", optnames(i), optlist[i] ? "on" : "off");
9558 out1fmt("set %co %s\n", optlist[i] ? '-' : '+', optnames(i));
9564 setoption(int flag, int val)
9568 for (i = 0; i < NOPTS; i++) {
9569 if (optletters(i) == flag) {
9574 ash_msg_and_raise_error("illegal option %c%c", val ? '-' : '+', flag);
9578 options(int cmdline)
9586 while ((p = *argptr) != NULL) {
9588 if (c != '-' && c != '+')
9591 val = 0; /* val = 0 if c == '+' */
9594 if (p[0] == '\0' || LONE_DASH(p)) {
9596 /* "-" means turn off -x and -v */
9599 /* "--" means reset params */
9600 else if (*argptr == NULL)
9603 break; /* "-" or "--" terminates options */
9606 /* first char was + or - */
9607 while ((c = *p++) != '\0') {
9608 /* bash 3.2 indeed handles -c CMD and +c CMD the same */
9609 if (c == 'c' && cmdline) {
9610 minusc = p; /* command is after shell args */
9611 } else if (c == 'o') {
9612 if (plus_minus_o(*argptr, val)) {
9613 /* it already printed err message */
9614 return 1; /* error */
9618 } else if (cmdline && (c == 'l')) { /* -l or +l == --login */
9620 /* bash does not accept +-login, we also won't */
9621 } else if (cmdline && val && (c == '-')) { /* long options */
9622 if (strcmp(p, "login") == 0)
9634 * The shift builtin command.
9637 shiftcmd(int argc UNUSED_PARAM, char **argv)
9644 n = number(argv[1]);
9645 if (n > shellparam.nparam)
9646 n = shellparam.nparam;
9648 shellparam.nparam -= n;
9649 for (ap1 = shellparam.p; --n >= 0; ap1++) {
9650 if (shellparam.malloced)
9654 while ((*ap2++ = *ap1++) != NULL)
9656 #if ENABLE_ASH_GETOPTS
9657 shellparam.optind = 1;
9658 shellparam.optoff = -1;
9665 * POSIX requires that 'set' (but not export or readonly) output the
9666 * variables in lexicographic order - by the locale's collating order (sigh).
9667 * Maybe we could keep them in an ordered balanced binary tree
9668 * instead of hashed lists.
9669 * For now just roll 'em through qsort for printing...
9672 showvars(const char *sep_prefix, int on, int off)
9677 ep = listvars(on, off, &epend);
9678 qsort(ep, epend - ep, sizeof(char *), vpcmp);
9680 sep = *sep_prefix ? " " : sep_prefix;
9682 for (; ep < epend; ep++) {
9686 p = strchrnul(*ep, '=');
9689 q = single_quote(++p);
9690 out1fmt("%s%s%.*s%s\n", sep_prefix, sep, (int)(p - *ep), *ep, q);
9696 * The set command builtin.
9699 setcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
9704 return showvars(nullstr, 0, VUNSET);
9707 if (!options(0)) { /* if no parse error... */
9710 if (*argptr != NULL) {
9718 #if ENABLE_ASH_RANDOM_SUPPORT
9720 change_random(const char *value)
9722 /* Galois LFSR parameter */
9723 /* Taps at 32 31 29 1: */
9724 enum { MASK = 0x8000000b };
9725 /* Another example - taps at 32 31 30 10: */
9726 /* MASK = 0x00400007 */
9728 if (value == NULL) {
9729 /* "get", generate */
9732 /* LCG has period of 2^32 and alternating lowest bit */
9733 random_LCG = 1664525 * random_LCG + 1013904223;
9734 /* Galois LFSR has period of 2^32-1 = 3 * 5 * 17 * 257 * 65537 */
9735 t = (random_galois_LFSR << 1);
9736 if (random_galois_LFSR < 0) /* if we just shifted 1 out of msb... */
9738 random_galois_LFSR = t;
9739 /* Both are weak, combining them gives better randomness
9740 * and ~2^64 period. & 0x7fff is probably bash compat
9741 * for $RANDOM range. Combining with subtraction is
9742 * just for fun. + and ^ would work equally well. */
9743 t = (t - random_LCG) & 0x7fff;
9744 /* set without recursion */
9745 setvar(vrandom.text, utoa(t), VNOFUNC);
9746 vrandom.flags &= ~VNOFUNC;
9749 random_galois_LFSR = random_LCG = strtoul(value, (char **)NULL, 10);
9754 #if ENABLE_ASH_GETOPTS
9756 getopts(char *optstr, char *optvar, char **optfirst, int *param_optind, int *optoff)
9765 if (*param_optind < 1)
9767 optnext = optfirst + *param_optind - 1;
9769 if (*param_optind <= 1 || *optoff < 0 || (int)strlen(optnext[-1]) < *optoff)
9772 p = optnext[-1] + *optoff;
9773 if (p == NULL || *p == '\0') {
9774 /* Current word is done, advance */
9776 if (p == NULL || *p != '-' || *++p == '\0') {
9783 if (LONE_DASH(p)) /* check for "--" */
9788 for (q = optstr; *q != c;) {
9790 if (optstr[0] == ':') {
9793 err |= setvarsafe("OPTARG", s, 0);
9795 fprintf(stderr, "Illegal option -%c\n", c);
9806 if (*p == '\0' && (p = *optnext) == NULL) {
9807 if (optstr[0] == ':') {
9810 err |= setvarsafe("OPTARG", s, 0);
9813 fprintf(stderr, "No arg for -%c option\n", c);
9822 err |= setvarsafe("OPTARG", p, 0);
9825 err |= setvarsafe("OPTARG", nullstr, 0);
9827 *optoff = p ? p - *(optnext - 1) : -1;
9828 *param_optind = optnext - optfirst + 1;
9829 fmtstr(s, sizeof(s), "%d", *param_optind);
9830 err |= setvarsafe("OPTIND", s, VNOFUNC);
9833 err |= setvarsafe(optvar, s, 0);
9837 flush_stdout_stderr();
9838 raise_exception(EXERROR);
9844 * The getopts builtin. Shellparam.optnext points to the next argument
9845 * to be processed. Shellparam.optptr points to the next character to
9846 * be processed in the current argument. If shellparam.optnext is NULL,
9847 * then it's the first time getopts has been called.
9850 getoptscmd(int argc, char **argv)
9855 ash_msg_and_raise_error("usage: getopts optstring var [arg]");
9857 optbase = shellparam.p;
9858 if (shellparam.optind > shellparam.nparam + 1) {
9859 shellparam.optind = 1;
9860 shellparam.optoff = -1;
9864 if (shellparam.optind > argc - 2) {
9865 shellparam.optind = 1;
9866 shellparam.optoff = -1;
9870 return getopts(argv[1], argv[2], optbase, &shellparam.optind,
9871 &shellparam.optoff);
9873 #endif /* ASH_GETOPTS */
9876 /* ============ Shell parser */
9879 struct heredoc *next; /* next here document in list */
9880 union node *here; /* redirection node */
9881 char *eofmark; /* string indicating end of input */
9882 smallint striptabs; /* if set, strip leading tabs */
9885 static smallint tokpushback; /* last token pushed back */
9886 static smallint parsebackquote; /* nonzero if we are inside backquotes */
9887 static smallint quoteflag; /* set if (part of) last token was quoted */
9888 static token_id_t lasttoken; /* last token read (integer id Txxx) */
9889 static struct heredoc *heredoclist; /* list of here documents to read */
9890 static char *wordtext; /* text of last word returned by readtoken */
9891 static struct nodelist *backquotelist;
9892 static union node *redirnode;
9893 static struct heredoc *heredoc;
9895 * NEOF is returned by parsecmd when it encounters an end of file. It
9896 * must be distinct from NULL, so we use the address of a variable that
9897 * happens to be handy.
9899 #define NEOF ((union node *)&tokpushback)
9901 static void raise_error_syntax(const char *) NORETURN;
9903 raise_error_syntax(const char *msg)
9905 ash_msg_and_raise_error("syntax error: %s", msg);
9910 * Called when an unexpected token is read during the parse. The argument
9911 * is the token that is expected, or -1 if more than one type of token can
9912 * occur at this point.
9914 static void raise_error_unexpected_syntax(int) NORETURN;
9916 raise_error_unexpected_syntax(int token)
9921 l = sprintf(msg, "%s unexpected", tokname(lasttoken));
9923 sprintf(msg + l, " (expecting %s)", tokname(token));
9924 raise_error_syntax(msg);
9928 #define EOFMARKLEN 79
9930 /* parsing is heavily cross-recursive, need these forward decls */
9931 static union node *andor(void);
9932 static union node *pipeline(void);
9933 static union node *parse_command(void);
9934 static void parseheredoc(void);
9935 static char peektoken(void);
9936 static int readtoken(void);
9941 union node *n1, *n2, *n3;
9944 checkkwd = CHKNL | CHKKWD | CHKALIAS;
9945 if (nlflag == 2 && peektoken())
9951 if (tok == TBACKGND) {
9952 if (n2->type == NPIPE) {
9953 n2->npipe.pipe_backgnd = 1;
9955 if (n2->type != NREDIR) {
9956 n3 = stzalloc(sizeof(struct nredir));
9958 /*n3->nredir.redirect = NULL; - stzalloc did it */
9961 n2->type = NBACKGND;
9967 n3 = stzalloc(sizeof(struct nbinary));
9969 n3->nbinary.ch1 = n1;
9970 n3->nbinary.ch2 = n2;
9986 checkkwd = CHKNL | CHKKWD | CHKALIAS;
9994 pungetc(); /* push back EOF on input */
9998 raise_error_unexpected_syntax(-1);
10005 static union node *
10008 union node *n1, *n2, *n3;
10016 } else if (t == TOR) {
10022 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10024 n3 = stzalloc(sizeof(struct nbinary));
10026 n3->nbinary.ch1 = n1;
10027 n3->nbinary.ch2 = n2;
10032 static union node *
10035 union node *n1, *n2, *pipenode;
10036 struct nodelist *lp, *prev;
10040 TRACE(("pipeline: entered\n"));
10041 if (readtoken() == TNOT) {
10043 checkkwd = CHKKWD | CHKALIAS;
10046 n1 = parse_command();
10047 if (readtoken() == TPIPE) {
10048 pipenode = stzalloc(sizeof(struct npipe));
10049 pipenode->type = NPIPE;
10050 /*pipenode->npipe.pipe_backgnd = 0; - stzalloc did it */
10051 lp = stzalloc(sizeof(struct nodelist));
10052 pipenode->npipe.cmdlist = lp;
10056 lp = stzalloc(sizeof(struct nodelist));
10057 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10058 lp->n = parse_command();
10060 } while (readtoken() == TPIPE);
10066 n2 = stzalloc(sizeof(struct nnot));
10074 static union node *
10079 n = stzalloc(sizeof(struct narg));
10081 /*n->narg.next = NULL; - stzalloc did it */
10082 n->narg.text = wordtext;
10083 n->narg.backquote = backquotelist;
10088 fixredir(union node *n, const char *text, int err)
10092 TRACE(("Fix redir %s %d\n", text, err));
10094 n->ndup.vname = NULL;
10096 fd = bb_strtou(text, NULL, 10);
10097 if (!errno && fd >= 0)
10098 n->ndup.dupfd = fd;
10099 else if (LONE_DASH(text))
10100 n->ndup.dupfd = -1;
10103 raise_error_syntax("Bad fd number");
10104 n->ndup.vname = makename();
10109 * Returns true if the text contains nothing to expand (no dollar signs
10113 noexpand(char *text)
10119 while ((c = *p++) != '\0') {
10120 if (c == CTLQUOTEMARK)
10124 else if (SIT(c, BASESYNTAX) == CCTL)
10133 union node *n = redirnode;
10135 if (readtoken() != TWORD)
10136 raise_error_unexpected_syntax(-1);
10137 if (n->type == NHERE) {
10138 struct heredoc *here = heredoc;
10142 if (quoteflag == 0)
10144 TRACE(("Here document %d\n", n->type));
10145 if (!noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN)
10146 raise_error_syntax("Illegal eof marker for << redirection");
10147 rmescapes(wordtext);
10148 here->eofmark = wordtext;
10150 if (heredoclist == NULL)
10151 heredoclist = here;
10153 for (p = heredoclist; p->next; p = p->next)
10157 } else if (n->type == NTOFD || n->type == NFROMFD) {
10158 fixredir(n, wordtext, 0);
10160 n->nfile.fname = makename();
10164 static union node *
10167 union node *args, **app;
10168 union node *n = NULL;
10169 union node *vars, **vpp;
10170 union node **rpp, *redir;
10172 #if ENABLE_ASH_BASH_COMPAT
10173 smallint double_brackets_flag = 0;
10183 savecheckkwd = CHKALIAS;
10186 checkkwd = savecheckkwd;
10189 #if ENABLE_ASH_BASH_COMPAT
10190 case TAND: /* "&&" */
10191 case TOR: /* "||" */
10192 if (!double_brackets_flag) {
10196 wordtext = (char *) (t == TAND ? "-a" : "-o");
10199 n = stzalloc(sizeof(struct narg));
10201 /*n->narg.next = NULL; - stzalloc did it */
10202 n->narg.text = wordtext;
10203 #if ENABLE_ASH_BASH_COMPAT
10204 if (strcmp("[[", wordtext) == 0)
10205 double_brackets_flag = 1;
10206 else if (strcmp("]]", wordtext) == 0)
10207 double_brackets_flag = 0;
10209 n->narg.backquote = backquotelist;
10210 if (savecheckkwd && isassignment(wordtext)) {
10212 vpp = &n->narg.next;
10215 app = &n->narg.next;
10220 *rpp = n = redirnode;
10221 rpp = &n->nfile.next;
10222 parsefname(); /* read name of redirection file */
10225 if (args && app == &args->narg.next
10228 struct builtincmd *bcmd;
10231 /* We have a function */
10232 if (readtoken() != TRP)
10233 raise_error_unexpected_syntax(TRP);
10234 name = n->narg.text;
10235 if (!goodname(name)
10236 || ((bcmd = find_builtin(name)) && IS_BUILTIN_SPECIAL(bcmd))
10238 raise_error_syntax("Bad function name");
10241 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10242 n->narg.next = parse_command();
10255 n = stzalloc(sizeof(struct ncmd));
10257 n->ncmd.args = args;
10258 n->ncmd.assign = vars;
10259 n->ncmd.redirect = redir;
10263 static union node *
10264 parse_command(void)
10266 union node *n1, *n2;
10267 union node *ap, **app;
10268 union node *cp, **cpp;
10269 union node *redir, **rpp;
10276 switch (readtoken()) {
10278 raise_error_unexpected_syntax(-1);
10281 n1 = stzalloc(sizeof(struct nif));
10283 n1->nif.test = list(0);
10284 if (readtoken() != TTHEN)
10285 raise_error_unexpected_syntax(TTHEN);
10286 n1->nif.ifpart = list(0);
10288 while (readtoken() == TELIF) {
10289 n2->nif.elsepart = stzalloc(sizeof(struct nif));
10290 n2 = n2->nif.elsepart;
10292 n2->nif.test = list(0);
10293 if (readtoken() != TTHEN)
10294 raise_error_unexpected_syntax(TTHEN);
10295 n2->nif.ifpart = list(0);
10297 if (lasttoken == TELSE)
10298 n2->nif.elsepart = list(0);
10300 n2->nif.elsepart = NULL;
10308 n1 = stzalloc(sizeof(struct nbinary));
10309 n1->type = (lasttoken == TWHILE) ? NWHILE : NUNTIL;
10310 n1->nbinary.ch1 = list(0);
10313 TRACE(("expecting DO got %s %s\n", tokname(got),
10314 got == TWORD ? wordtext : ""));
10315 raise_error_unexpected_syntax(TDO);
10317 n1->nbinary.ch2 = list(0);
10322 if (readtoken() != TWORD || quoteflag || !goodname(wordtext))
10323 raise_error_syntax("Bad for loop variable");
10324 n1 = stzalloc(sizeof(struct nfor));
10326 n1->nfor.var = wordtext;
10327 checkkwd = CHKKWD | CHKALIAS;
10328 if (readtoken() == TIN) {
10330 while (readtoken() == TWORD) {
10331 n2 = stzalloc(sizeof(struct narg));
10333 /*n2->narg.next = NULL; - stzalloc did it */
10334 n2->narg.text = wordtext;
10335 n2->narg.backquote = backquotelist;
10337 app = &n2->narg.next;
10340 n1->nfor.args = ap;
10341 if (lasttoken != TNL && lasttoken != TSEMI)
10342 raise_error_unexpected_syntax(-1);
10344 n2 = stzalloc(sizeof(struct narg));
10346 /*n2->narg.next = NULL; - stzalloc did it */
10347 n2->narg.text = (char *)dolatstr;
10348 /*n2->narg.backquote = NULL;*/
10349 n1->nfor.args = n2;
10351 * Newline or semicolon here is optional (but note
10352 * that the original Bourne shell only allowed NL).
10354 if (lasttoken != TNL && lasttoken != TSEMI)
10357 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10358 if (readtoken() != TDO)
10359 raise_error_unexpected_syntax(TDO);
10360 n1->nfor.body = list(0);
10364 n1 = stzalloc(sizeof(struct ncase));
10366 if (readtoken() != TWORD)
10367 raise_error_unexpected_syntax(TWORD);
10368 n1->ncase.expr = n2 = stzalloc(sizeof(struct narg));
10370 /*n2->narg.next = NULL; - stzalloc did it */
10371 n2->narg.text = wordtext;
10372 n2->narg.backquote = backquotelist;
10374 checkkwd = CHKKWD | CHKALIAS;
10375 } while (readtoken() == TNL);
10376 if (lasttoken != TIN)
10377 raise_error_unexpected_syntax(TIN);
10378 cpp = &n1->ncase.cases;
10380 checkkwd = CHKNL | CHKKWD;
10382 while (t != TESAC) {
10383 if (lasttoken == TLP)
10385 *cpp = cp = stzalloc(sizeof(struct nclist));
10387 app = &cp->nclist.pattern;
10389 *app = ap = stzalloc(sizeof(struct narg));
10391 /*ap->narg.next = NULL; - stzalloc did it */
10392 ap->narg.text = wordtext;
10393 ap->narg.backquote = backquotelist;
10394 if (readtoken() != TPIPE)
10396 app = &ap->narg.next;
10399 //ap->narg.next = NULL;
10400 if (lasttoken != TRP)
10401 raise_error_unexpected_syntax(TRP);
10402 cp->nclist.body = list(2);
10404 cpp = &cp->nclist.next;
10406 checkkwd = CHKNL | CHKKWD;
10410 raise_error_unexpected_syntax(TENDCASE);
10417 n1 = stzalloc(sizeof(struct nredir));
10418 n1->type = NSUBSHELL;
10419 n1->nredir.n = list(0);
10420 /*n1->nredir.redirect = NULL; - stzalloc did it */
10430 return simplecmd();
10433 if (readtoken() != t)
10434 raise_error_unexpected_syntax(t);
10437 /* Now check for redirection which may follow command */
10438 checkkwd = CHKKWD | CHKALIAS;
10440 while (readtoken() == TREDIR) {
10441 *rpp = n2 = redirnode;
10442 rpp = &n2->nfile.next;
10448 if (n1->type != NSUBSHELL) {
10449 n2 = stzalloc(sizeof(struct nredir));
10454 n1->nredir.redirect = redir;
10459 #if ENABLE_ASH_BASH_COMPAT
10460 static int decode_dollar_squote(void)
10462 static const char C_escapes[] ALIGN1 = "nrbtfav""x\\01234567";
10468 p = strchr(C_escapes, c);
10473 if ((unsigned char)(c - '0') <= 7) { /* \ooo */
10477 } while ((unsigned char)(c - '0') <= 7 && --cnt);
10479 } else if (c == 'x') { /* \xHH */
10483 } while (isxdigit(c) && --cnt);
10485 if (cnt == 3) { /* \x but next char is "bad" */
10489 } else { /* simple seq like \\ or \t */
10494 c = bb_process_escape_sequence((void*)&p);
10495 } else { /* unrecognized "\z": print both chars unless ' or " */
10496 if (c != '\'' && c != '"') {
10498 c |= 0x100; /* "please encode \, then me" */
10506 * If eofmark is NULL, read a word or a redirection symbol. If eofmark
10507 * is not NULL, read a here document. In the latter case, eofmark is the
10508 * word which marks the end of the document and striptabs is true if
10509 * leading tabs should be stripped from the document. The argument firstc
10510 * is the first character of the input token or document.
10512 * Because C does not have internal subroutines, I have simulated them
10513 * using goto's to implement the subroutine linkage. The following macros
10514 * will run code that appears at the end of readtoken1.
10516 #define CHECKEND() {goto checkend; checkend_return:;}
10517 #define PARSEREDIR() {goto parseredir; parseredir_return:;}
10518 #define PARSESUB() {goto parsesub; parsesub_return:;}
10519 #define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;}
10520 #define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;}
10521 #define PARSEARITH() {goto parsearith; parsearith_return:;}
10523 readtoken1(int firstc, int syntax, char *eofmark, int striptabs)
10525 /* NB: syntax parameter fits into smallint */
10529 char line[EOFMARKLEN + 1];
10530 struct nodelist *bqlist;
10534 smallint prevsyntax; /* syntax before arithmetic */
10535 #if ENABLE_ASH_EXPAND_PRMT
10536 smallint pssyntax; /* we are expanding a prompt string */
10538 int varnest; /* levels of variables expansion */
10539 int arinest; /* levels of arithmetic expansion */
10540 int parenlevel; /* levels of parens in arithmetic */
10541 int dqvarnest; /* levels of variables expansion within double quotes */
10543 USE_ASH_BASH_COMPAT(smallint bash_dollar_squote = 0;)
10546 /* Avoid longjmp clobbering */
10552 (void) &parenlevel;
10555 (void) &prevsyntax;
10558 startlinno = plinno;
10563 #if ENABLE_ASH_EXPAND_PRMT
10564 pssyntax = (syntax == PSSYNTAX);
10568 dblquote = (syntax == DQSYNTAX);
10574 STARTSTACKSTR(out);
10575 loop: { /* for each line, until end of word */
10576 CHECKEND(); /* set c to PEOF if at end of here document */
10577 for (;;) { /* until end of line or end of word */
10578 CHECKSTRSPACE(4, out); /* permit 4 calls to USTPUTC */
10579 switch (SIT(c, syntax)) {
10580 case CNL: /* '\n' */
10581 if (syntax == BASESYNTAX)
10582 goto endword; /* exit outer loop */
10588 goto loop; /* continue outer loop */
10593 if (eofmark == NULL || dblquote)
10594 USTPUTC(CTLESC, out);
10595 #if ENABLE_ASH_BASH_COMPAT
10596 if (c == '\\' && bash_dollar_squote) {
10597 c = decode_dollar_squote();
10599 USTPUTC('\\', out);
10600 c = (unsigned char)c;
10606 case CBACK: /* backslash */
10609 USTPUTC(CTLESC, out);
10610 USTPUTC('\\', out);
10612 } else if (c == '\n') {
10616 #if ENABLE_ASH_EXPAND_PRMT
10617 if (c == '$' && pssyntax) {
10618 USTPUTC(CTLESC, out);
10619 USTPUTC('\\', out);
10622 if (dblquote && c != '\\'
10623 && c != '`' && c != '$'
10624 && (c != '"' || eofmark != NULL)
10626 USTPUTC(CTLESC, out);
10627 USTPUTC('\\', out);
10629 if (SIT(c, SQSYNTAX) == CCTL)
10630 USTPUTC(CTLESC, out);
10638 if (eofmark == NULL) {
10639 USTPUTC(CTLQUOTEMARK, out);
10647 USE_ASH_BASH_COMPAT(bash_dollar_squote = 0;)
10648 if (eofmark != NULL && arinest == 0
10653 if (dqvarnest == 0) {
10654 syntax = BASESYNTAX;
10661 case CVAR: /* '$' */
10662 PARSESUB(); /* parse substitution */
10664 case CENDVAR: /* '}' */
10667 if (dqvarnest > 0) {
10670 USTPUTC(CTLENDVAR, out);
10675 #if ENABLE_ASH_MATH_SUPPORT
10676 case CLP: /* '(' in arithmetic */
10680 case CRP: /* ')' in arithmetic */
10681 if (parenlevel > 0) {
10685 if (pgetc() == ')') {
10686 if (--arinest == 0) {
10687 USTPUTC(CTLENDARI, out);
10688 syntax = prevsyntax;
10689 dblquote = (syntax == DQSYNTAX);
10694 * unbalanced parens
10695 * (don't 2nd guess - no error)
10703 case CBQUOTE: /* '`' */
10707 goto endword; /* exit outer loop */
10712 goto endword; /* exit outer loop */
10713 #if ENABLE_ASH_ALIAS
10723 #if ENABLE_ASH_MATH_SUPPORT
10724 if (syntax == ARISYNTAX)
10725 raise_error_syntax("Missing '))'");
10727 if (syntax != BASESYNTAX && !parsebackquote && eofmark == NULL)
10728 raise_error_syntax("Unterminated quoted string");
10729 if (varnest != 0) {
10730 startlinno = plinno;
10732 raise_error_syntax("Missing '}'");
10734 USTPUTC('\0', out);
10735 len = out - (char *)stackblock();
10736 out = stackblock();
10737 if (eofmark == NULL) {
10738 if ((c == '>' || c == '<') && quotef == 0) {
10739 int maxlen = 9 + 1; /* max 9 digit fd#: 999999999 */
10741 while (--maxlen && isdigit(*np))
10744 PARSEREDIR(); /* passed as params: out, c */
10745 lasttoken = TREDIR;
10748 /* else: non-number X seen, interpret it
10749 * as "NNNX>file" = "NNNX >file" */
10753 quoteflag = quotef;
10754 backquotelist = bqlist;
10755 grabstackblock(len);
10759 /* end of readtoken routine */
10762 * Check to see whether we are at the end of the here document. When this
10763 * is called, c is set to the first character of the next input line. If
10764 * we are at the end of the here document, this routine sets the c to PEOF.
10768 #if ENABLE_ASH_ALIAS
10774 while (c == '\t') {
10778 if (c == *eofmark) {
10779 if (pfgets(line, sizeof(line)) != NULL) {
10783 for (q = eofmark + 1; *q && *p == *q; p++, q++)
10785 if (*p == '\n' && *q == '\0') {
10788 needprompt = doprompt;
10790 pushstring(line, NULL);
10795 goto checkend_return;
10799 * Parse a redirection operator. The variable "out" points to a string
10800 * specifying the fd to be redirected. The variable "c" contains the
10801 * first character of the redirection operator.
10804 /* out is already checked to be a valid number or "" */
10805 int fd = (*out == '\0' ? -1 : atoi(out));
10808 np = stzalloc(sizeof(struct nfile));
10813 np->type = NAPPEND;
10815 np->type = NCLOBBER;
10822 } else { /* c == '<' */
10823 /*np->nfile.fd = 0; - stzalloc did it */
10827 if (sizeof(struct nfile) != sizeof(struct nhere)) {
10828 np = stzalloc(sizeof(struct nhere));
10829 /*np->nfile.fd = 0; - stzalloc did it */
10832 heredoc = stzalloc(sizeof(struct heredoc));
10833 heredoc->here = np;
10836 heredoc->striptabs = 1;
10838 /*heredoc->striptabs = 0; - stzalloc did it */
10844 np->type = NFROMFD;
10848 np->type = NFROMTO;
10860 goto parseredir_return;
10864 * Parse a substitution. At this point, we have read the dollar sign
10865 * and nothing else.
10868 /* is_special(c) evaluates to 1 for c in "!#$*-0123456789?@"; 0 otherwise
10869 * (assuming ascii char codes, as the original implementation did) */
10870 #define is_special(c) \
10871 (((unsigned)(c) - 33 < 32) \
10872 && ((0xc1ff920dU >> ((unsigned)(c) - 33)) & 1))
10878 static const char types[] ALIGN1 = "}-+?=";
10881 if (c <= PEOA_OR_PEOF
10882 || (c != '(' && c != '{' && !is_name(c) && !is_special(c))
10884 #if ENABLE_ASH_BASH_COMPAT
10886 bash_dollar_squote = 1;
10891 } else if (c == '(') { /* $(command) or $((arith)) */
10892 if (pgetc() == '(') {
10893 #if ENABLE_ASH_MATH_SUPPORT
10896 raise_error_syntax("you disabled math support for $((arith)) syntax");
10903 USTPUTC(CTLVAR, out);
10904 typeloc = out - (char *)stackblock();
10905 USTPUTC(VSNORMAL, out);
10906 subtype = VSNORMAL;
10914 subtype = VSLENGTH;
10918 if (c > PEOA_OR_PEOF && is_name(c)) {
10922 } while (c > PEOA_OR_PEOF && is_in_name(c));
10923 } else if (isdigit(c)) {
10927 } while (isdigit(c));
10928 } else if (is_special(c)) {
10932 badsub: raise_error_syntax("Bad substitution");
10936 if (subtype == 0) {
10940 #if ENABLE_ASH_BASH_COMPAT
10941 if (c == ':' || c == '$' || isdigit(c)) {
10943 subtype = VSSUBSTR;
10950 p = strchr(types, c);
10953 subtype = p - types + VSNORMAL;
10958 subtype = c == '#' ? VSTRIMLEFT : VSTRIMRIGHT;
10966 #if ENABLE_ASH_BASH_COMPAT
10968 subtype = VSREPLACE;
10971 subtype++; /* VSREPLACEALL */
10980 if (dblquote || arinest)
10982 *((char *)stackblock() + typeloc) = subtype | flags;
10983 if (subtype != VSNORMAL) {
10985 if (dblquote || arinest) {
10990 goto parsesub_return;
10994 * Called to parse command substitutions. Newstyle is set if the command
10995 * is enclosed inside $(...); nlpp is a pointer to the head of the linked
10996 * list of commands (passed by reference), and savelen is the number of
10997 * characters on the top of the stack which must be preserved.
11000 struct nodelist **nlpp;
11003 char *volatile str;
11004 struct jmploc jmploc;
11005 struct jmploc *volatile savehandler;
11007 smallint saveprompt = 0;
11010 (void) &saveprompt;
11012 savepbq = parsebackquote;
11013 if (setjmp(jmploc.loc)) {
11015 parsebackquote = 0;
11016 exception_handler = savehandler;
11017 longjmp(exception_handler->loc, 1);
11021 savelen = out - (char *)stackblock();
11023 str = ckmalloc(savelen);
11024 memcpy(str, stackblock(), savelen);
11026 savehandler = exception_handler;
11027 exception_handler = &jmploc;
11030 /* We must read until the closing backquote, giving special
11031 treatment to some slashes, and then push the string and
11032 reread it as input, interpreting it normally. */
11039 STARTSTACKSTR(pout);
11056 * If eating a newline, avoid putting
11057 * the newline into the new character
11058 * stream (via the STPUTC after the
11063 if (pc != '\\' && pc != '`' && pc != '$'
11064 && (!dblquote || pc != '"'))
11065 STPUTC('\\', pout);
11066 if (pc > PEOA_OR_PEOF) {
11072 #if ENABLE_ASH_ALIAS
11075 startlinno = plinno;
11076 raise_error_syntax("EOF in backquote substitution");
11080 needprompt = doprompt;
11089 STPUTC('\0', pout);
11090 psavelen = pout - (char *)stackblock();
11091 if (psavelen > 0) {
11092 pstr = grabstackstr(pout);
11093 setinputstring(pstr);
11098 nlpp = &(*nlpp)->next;
11099 *nlpp = stzalloc(sizeof(**nlpp));
11100 /* (*nlpp)->next = NULL; - stzalloc did it */
11101 parsebackquote = oldstyle;
11104 saveprompt = doprompt;
11111 doprompt = saveprompt;
11112 else if (readtoken() != TRP)
11113 raise_error_unexpected_syntax(TRP);
11118 * Start reading from old file again, ignoring any pushed back
11119 * tokens left from the backquote parsing
11124 while (stackblocksize() <= savelen)
11126 STARTSTACKSTR(out);
11128 memcpy(out, str, savelen);
11129 STADJUST(savelen, out);
11135 parsebackquote = savepbq;
11136 exception_handler = savehandler;
11137 if (arinest || dblquote)
11138 USTPUTC(CTLBACKQ | CTLQUOTE, out);
11140 USTPUTC(CTLBACKQ, out);
11142 goto parsebackq_oldreturn;
11143 goto parsebackq_newreturn;
11146 #if ENABLE_ASH_MATH_SUPPORT
11148 * Parse an arithmetic expansion (indicate start of one and set state)
11151 if (++arinest == 1) {
11152 prevsyntax = syntax;
11153 syntax = ARISYNTAX;
11154 USTPUTC(CTLARI, out);
11161 * we collapse embedded arithmetic expansion to
11162 * parenthesis, which should be equivalent
11166 goto parsearith_return;
11170 } /* end of readtoken */
11173 * Read the next input token.
11174 * If the token is a word, we set backquotelist to the list of cmds in
11175 * backquotes. We set quoteflag to true if any part of the word was
11177 * If the token is TREDIR, then we set redirnode to a structure containing
11179 * In all cases, the variable startlinno is set to the number of the line
11180 * on which the token starts.
11182 * [Change comment: here documents and internal procedures]
11183 * [Readtoken shouldn't have any arguments. Perhaps we should make the
11184 * word parsing code into a separate routine. In this case, readtoken
11185 * doesn't need to have any internal procedures, but parseword does.
11186 * We could also make parseoperator in essence the main routine, and
11187 * have parseword (readtoken1?) handle both words and redirection.]
11189 #define NEW_xxreadtoken
11190 #ifdef NEW_xxreadtoken
11191 /* singles must be first! */
11192 static const char xxreadtoken_chars[7] ALIGN1 = {
11193 '\n', '(', ')', '&', '|', ';', 0
11196 static const char xxreadtoken_tokens[] ALIGN1 = {
11197 TNL, TLP, TRP, /* only single occurrence allowed */
11198 TBACKGND, TPIPE, TSEMI, /* if single occurrence */
11199 TEOF, /* corresponds to trailing nul */
11200 TAND, TOR, TENDCASE /* if double occurrence */
11203 #define xxreadtoken_doubles \
11204 (sizeof(xxreadtoken_tokens) - sizeof(xxreadtoken_chars))
11205 #define xxreadtoken_singles \
11206 (sizeof(xxreadtoken_chars) - xxreadtoken_doubles - 1)
11220 startlinno = plinno;
11221 for (;;) { /* until token or start of word found */
11224 if ((c != ' ') && (c != '\t')
11225 #if ENABLE_ASH_ALIAS
11230 while ((c = pgetc()) != '\n' && c != PEOF)
11233 } else if (c == '\\') {
11234 if (pgetc() != '\n') {
11238 startlinno = ++plinno;
11243 = xxreadtoken_chars + sizeof(xxreadtoken_chars) - 1;
11248 needprompt = doprompt;
11251 p = strchr(xxreadtoken_chars, c);
11254 return readtoken1(c, BASESYNTAX, (char *) NULL, 0);
11257 if ((size_t)(p - xxreadtoken_chars) >= xxreadtoken_singles) {
11258 if (pgetc() == *p) { /* double occurrence? */
11259 p += xxreadtoken_doubles + 1;
11265 lasttoken = xxreadtoken_tokens[p - xxreadtoken_chars];
11272 #define RETURN(token) return lasttoken = token
11285 startlinno = plinno;
11286 for (;;) { /* until token or start of word found */
11289 case ' ': case '\t':
11290 #if ENABLE_ASH_ALIAS
11295 while ((c = pgetc()) != '\n' && c != PEOF)
11300 if (pgetc() == '\n') {
11301 startlinno = ++plinno;
11310 needprompt = doprompt;
11315 if (pgetc() == '&')
11320 if (pgetc() == '|')
11325 if (pgetc() == ';')
11338 return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
11341 #endif /* NEW_xxreadtoken */
11348 smallint alreadyseen = tokpushback;
11351 #if ENABLE_ASH_ALIAS
11360 if (checkkwd & CHKNL) {
11367 if (t != TWORD || quoteflag) {
11372 * check for keywords
11374 if (checkkwd & CHKKWD) {
11375 const char *const *pp;
11377 pp = findkwd(wordtext);
11379 lasttoken = t = pp - tokname_array;
11380 TRACE(("keyword %s recognized\n", tokname(t)));
11385 if (checkkwd & CHKALIAS) {
11386 #if ENABLE_ASH_ALIAS
11388 ap = lookupalias(wordtext, 1);
11391 pushstring(ap->val, ap);
11401 TRACE(("token %s %s\n", tokname(t), t == TWORD ? wordtext : ""));
11403 TRACE(("reread token %s %s\n", tokname(t), t == TWORD ? wordtext : ""));
11415 return tokname_array[t][0];
11419 * Read and parse a command. Returns NEOF on end of file. (NULL is a
11420 * valid parse tree indicating a blank line.)
11422 static union node *
11423 parsecmd(int interact)
11428 doprompt = interact;
11430 setprompt(doprompt);
11442 * Input any here documents.
11447 struct heredoc *here;
11450 here = heredoclist;
11451 heredoclist = NULL;
11457 readtoken1(pgetc(), here->here->type == NHERE? SQSYNTAX : DQSYNTAX,
11458 here->eofmark, here->striptabs);
11459 n = stzalloc(sizeof(struct narg));
11460 n->narg.type = NARG;
11461 /*n->narg.next = NULL; - stzalloc did it */
11462 n->narg.text = wordtext;
11463 n->narg.backquote = backquotelist;
11464 here->here->nhere.doc = n;
11471 * called by editline -- any expansions to the prompt should be added here.
11473 #if ENABLE_ASH_EXPAND_PRMT
11474 static const char *
11475 expandstr(const char *ps)
11479 /* XXX Fix (char *) cast. */
11480 setinputstring((char *)ps);
11481 readtoken1(pgetc(), PSSYNTAX, nullstr, 0);
11484 n.narg.type = NARG;
11485 n.narg.next = NULL;
11486 n.narg.text = wordtext;
11487 n.narg.backquote = backquotelist;
11489 expandarg(&n, NULL, 0);
11490 return stackblock();
11495 * Execute a command or commands contained in a string.
11498 evalstring(char *s, int mask)
11501 struct stackmark smark;
11505 setstackmark(&smark);
11508 while ((n = parsecmd(0)) != NEOF) {
11510 popstackmark(&smark);
11523 * The eval command.
11526 evalcmd(int argc UNUSED_PARAM, char **argv)
11535 STARTSTACKSTR(concat);
11537 concat = stack_putstr(p, concat);
11541 STPUTC(' ', concat);
11543 STPUTC('\0', concat);
11544 p = grabstackstr(concat);
11546 evalstring(p, ~SKIPEVAL);
11553 * Read and execute commands. "Top" is nonzero for the top level command
11554 * loop; it turns on prompting if the shell is interactive.
11560 struct stackmark smark;
11564 TRACE(("cmdloop(%d) called\n", top));
11568 setstackmark(&smark);
11571 showjobs(stderr, SHOW_CHANGED);
11574 if (iflag && top) {
11576 #if ENABLE_ASH_MAIL
11580 n = parsecmd(inter);
11581 /* showtree(n); DEBUG */
11583 if (!top || numeof >= 50)
11585 if (!stoppedjobs()) {
11588 out2str("\nUse \"exit\" to leave shell.\n");
11591 } else if (nflag == 0) {
11592 /* job_warning can only be 2,1,0. Here 2->1, 1/0->0 */
11597 popstackmark(&smark);
11602 return skip & SKIPEVAL;
11609 * Take commands from a file. To be compatible we should do a path
11610 * search for the file, which is necessary to find sub-commands.
11613 find_dot_file(char *name)
11616 const char *path = pathval();
11619 /* don't try this for absolute or relative paths */
11620 if (strchr(name, '/'))
11623 while ((fullname = padvance(&path, name)) != NULL) {
11624 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
11626 * Don't bother freeing here, since it will
11627 * be freed by the caller.
11631 stunalloc(fullname);
11634 /* not found in the PATH */
11635 ash_msg_and_raise_error("%s: not found", name);
11640 dotcmd(int argc, char **argv)
11642 struct strlist *sp;
11643 volatile struct shparam saveparam;
11646 for (sp = cmdenviron; sp; sp = sp->next)
11647 setvareq(ckstrdup(sp->text), VSTRFIXED | VTEXTFIXED);
11649 if (argv[1]) { /* That's what SVR2 does */
11650 char *fullname = find_dot_file(argv[1]);
11653 if (argc) { /* argc > 0, argv[0] != NULL */
11654 saveparam = shellparam;
11655 shellparam.malloced = 0;
11656 shellparam.nparam = argc;
11657 shellparam.p = argv;
11660 setinputfile(fullname, INPUT_PUSH_FILE);
11661 commandname = fullname;
11666 freeparam(&shellparam);
11667 shellparam = saveparam;
11669 status = exitstatus;
11675 exitcmd(int argc UNUSED_PARAM, char **argv)
11680 exitstatus = number(argv[1]);
11681 raise_exception(EXEXIT);
11686 * Read a file containing shell functions.
11689 readcmdfile(char *name)
11691 setinputfile(name, INPUT_PUSH_FILE);
11697 /* ============ find_command inplementation */
11700 * Resolve a command name. If you change this routine, you may have to
11701 * change the shellexec routine as well.
11704 find_command(char *name, struct cmdentry *entry, int act, const char *path)
11706 struct tblentry *cmdp;
11713 struct builtincmd *bcmd;
11715 /* If name contains a slash, don't use PATH or hash table */
11716 if (strchr(name, '/') != NULL) {
11717 entry->u.index = -1;
11718 if (act & DO_ABS) {
11719 while (stat(name, &statb) < 0) {
11721 if (errno == EINTR)
11724 entry->cmdtype = CMDUNKNOWN;
11728 entry->cmdtype = CMDNORMAL;
11732 /* #if ENABLE_FEATURE_SH_STANDALONE... moved after builtin check */
11734 updatetbl = (path == pathval());
11737 if (strstr(path, "%builtin") != NULL)
11738 act |= DO_ALTBLTIN;
11741 /* If name is in the table, check answer will be ok */
11742 cmdp = cmdlookup(name, 0);
11743 if (cmdp != NULL) {
11746 switch (cmdp->cmdtype) {
11764 } else if (cmdp->rehash == 0)
11765 /* if not invalidated by cd, we're done */
11769 /* If %builtin not in path, check for builtin next */
11770 bcmd = find_builtin(name);
11772 if (IS_BUILTIN_REGULAR(bcmd))
11773 goto builtin_success;
11774 if (act & DO_ALTPATH) {
11775 if (!(act & DO_ALTBLTIN))
11776 goto builtin_success;
11777 } else if (builtinloc <= 0) {
11778 goto builtin_success;
11782 #if ENABLE_FEATURE_SH_STANDALONE
11784 int applet_no = find_applet_by_name(name);
11785 if (applet_no >= 0) {
11786 entry->cmdtype = CMDNORMAL;
11787 entry->u.index = -2 - applet_no;
11793 /* We have to search path. */
11794 prev = -1; /* where to start */
11795 if (cmdp && cmdp->rehash) { /* doing a rehash */
11796 if (cmdp->cmdtype == CMDBUILTIN)
11799 prev = cmdp->param.index;
11805 while ((fullname = padvance(&path, name)) != NULL) {
11806 stunalloc(fullname);
11807 /* NB: code below will still use fullname
11808 * despite it being "unallocated" */
11811 if (prefix(pathopt, "builtin")) {
11813 goto builtin_success;
11816 if ((act & DO_NOFUNC)
11817 || !prefix(pathopt, "func")
11818 ) { /* ignore unimplemented options */
11822 /* if rehash, don't redo absolute path names */
11823 if (fullname[0] == '/' && idx <= prev) {
11826 TRACE(("searchexec \"%s\": no change\n", name));
11829 while (stat(fullname, &statb) < 0) {
11831 if (errno == EINTR)
11834 if (errno != ENOENT && errno != ENOTDIR)
11838 e = EACCES; /* if we fail, this will be the error */
11839 if (!S_ISREG(statb.st_mode))
11841 if (pathopt) { /* this is a %func directory */
11842 stalloc(strlen(fullname) + 1);
11843 /* NB: stalloc will return space pointed by fullname
11844 * (because we don't have any intervening allocations
11845 * between stunalloc above and this stalloc) */
11846 readcmdfile(fullname);
11847 cmdp = cmdlookup(name, 0);
11848 if (cmdp == NULL || cmdp->cmdtype != CMDFUNCTION)
11849 ash_msg_and_raise_error("%s not defined in %s", name, fullname);
11850 stunalloc(fullname);
11853 TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
11855 entry->cmdtype = CMDNORMAL;
11856 entry->u.index = idx;
11860 cmdp = cmdlookup(name, 1);
11861 cmdp->cmdtype = CMDNORMAL;
11862 cmdp->param.index = idx;
11867 /* We failed. If there was an entry for this command, delete it */
11868 if (cmdp && updatetbl)
11869 delete_cmd_entry();
11871 ash_msg("%s: %s", name, errmsg(e, "not found"));
11872 entry->cmdtype = CMDUNKNOWN;
11877 entry->cmdtype = CMDBUILTIN;
11878 entry->u.cmd = bcmd;
11882 cmdp = cmdlookup(name, 1);
11883 cmdp->cmdtype = CMDBUILTIN;
11884 cmdp->param.cmd = bcmd;
11888 entry->cmdtype = cmdp->cmdtype;
11889 entry->u = cmdp->param;
11893 /* ============ trap.c */
11896 * The trap builtin.
11899 trapcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
11908 for (signo = 0; signo < NSIG; signo++) {
11909 if (trap[signo] != NULL) {
11912 sn = get_signame(signo);
11913 out1fmt("trap -- %s %s\n",
11914 single_quote(trap[signo]), sn);
11924 signo = get_signum(*ap);
11926 ash_msg_and_raise_error("%s: bad trap", *ap);
11929 if (LONE_DASH(action))
11932 action = ckstrdup(action);
11935 trap[signo] = action;
11945 /* ============ Builtins */
11947 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
11949 * Lists available builtins
11952 helpcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
11957 out1fmt("\nBuilt-in commands:\n-------------------\n");
11958 for (col = 0, i = 0; i < ARRAY_SIZE(builtintab); i++) {
11959 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '),
11960 builtintab[i].name + 1);
11966 #if ENABLE_FEATURE_SH_STANDALONE
11968 const char *a = applet_names;
11970 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '), a);
11975 a += strlen(a) + 1;
11980 return EXIT_SUCCESS;
11982 #endif /* FEATURE_SH_EXTRA_QUIET */
11985 * The export and readonly commands.
11988 exportcmd(int argc UNUSED_PARAM, char **argv)
11994 int flag = argv[0][0] == 'r'? VREADONLY : VEXPORT;
11996 if (nextopt("p") != 'p') {
12001 p = strchr(name, '=');
12005 vp = *findvar(hashvar(name), name);
12011 setvar(name, p, flag);
12012 } while ((name = *++aptr) != NULL);
12016 showvars(argv[0], flag, 0);
12021 * Delete a function if it exists.
12024 unsetfunc(const char *name)
12026 struct tblentry *cmdp;
12028 cmdp = cmdlookup(name, 0);
12029 if (cmdp!= NULL && cmdp->cmdtype == CMDFUNCTION)
12030 delete_cmd_entry();
12034 * The unset builtin command. We unset the function before we unset the
12035 * variable to allow a function to be unset when there is a readonly variable
12036 * with the same name.
12039 unsetcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12046 while ((i = nextopt("vf")) != '\0') {
12050 for (ap = argptr; *ap; ap++) {
12066 #include <sys/times.h>
12068 static const unsigned char timescmd_str[] ALIGN1 = {
12069 ' ', offsetof(struct tms, tms_utime),
12070 '\n', offsetof(struct tms, tms_stime),
12071 ' ', offsetof(struct tms, tms_cutime),
12072 '\n', offsetof(struct tms, tms_cstime),
12077 timescmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12079 long clk_tck, s, t;
12080 const unsigned char *p;
12083 clk_tck = sysconf(_SC_CLK_TCK);
12088 t = *(clock_t *)(((char *) &buf) + p[1]);
12090 out1fmt("%ldm%ld.%.3lds%c",
12092 ((t - s * clk_tck) * 1000) / clk_tck,
12094 } while (*(p += 2));
12099 #if ENABLE_ASH_MATH_SUPPORT
12101 dash_arith(const char *s)
12107 result = arith(s, &errcode);
12110 ash_msg_and_raise_error("exponent less than 0");
12112 ash_msg_and_raise_error("divide by zero");
12114 ash_msg_and_raise_error("expression recursion loop detected");
12115 raise_error_syntax(s);
12123 * The let builtin. partial stolen from GNU Bash, the Bourne Again SHell.
12124 * Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
12126 * Copyright (C) 2003 Vladimir Oleynik <dzo@simtreas.ru>
12129 letcmd(int argc UNUSED_PARAM, char **argv)
12135 ash_msg_and_raise_error("expression expected");
12137 i = dash_arith(*argv);
12142 #endif /* ASH_MATH_SUPPORT */
12145 /* ============ miscbltin.c
12147 * Miscellaneous builtins.
12152 #if defined(__GLIBC__) && __GLIBC__ == 2 && __GLIBC_MINOR__ < 1
12153 typedef enum __rlimit_resource rlim_t;
12157 * The read builtin. Options:
12158 * -r Do not interpret '\' specially
12159 * -s Turn off echo (tty only)
12160 * -n NCHARS Read NCHARS max
12161 * -p PROMPT Display PROMPT on stderr (if input is from tty)
12162 * -t SECONDS Timeout after SECONDS (tty or pipe only)
12163 * -u FD Read from given FD instead of fd 0
12164 * This uses unbuffered input, which may be avoidable in some cases.
12165 * TODO: bash also has:
12166 * -a ARRAY Read into array[0],[1],etc
12167 * -d DELIM End on DELIM char, not newline
12168 * -e Use line editing (tty only)
12171 readcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12173 static const char *const arg_REPLY[] = { "REPLY", NULL };
12186 #if ENABLE_ASH_READ_NCHARS
12187 int nchars = 0; /* if != 0, -n is in effect */
12189 struct termios tty, old_tty;
12191 #if ENABLE_ASH_READ_TIMEOUT
12192 unsigned end_ms = 0;
12193 unsigned timeout = 0;
12198 while ((i = nextopt("p:u:r"
12199 USE_ASH_READ_TIMEOUT("t:")
12200 USE_ASH_READ_NCHARS("n:s")
12204 prompt = optionarg;
12206 #if ENABLE_ASH_READ_NCHARS
12208 nchars = bb_strtou(optionarg, NULL, 10);
12209 if (nchars < 0 || errno)
12210 ash_msg_and_raise_error("invalid count");
12211 /* nchars == 0: off (bash 3.2 does this too) */
12217 #if ENABLE_ASH_READ_TIMEOUT
12219 timeout = bb_strtou(optionarg, NULL, 10);
12220 if (errno || timeout > UINT_MAX / 2048)
12221 ash_msg_and_raise_error("invalid timeout");
12223 #if 0 /* even bash have no -t N.NNN support */
12224 ts.tv_sec = bb_strtou(optionarg, &p, 10);
12226 /* EINVAL means number is ok, but not terminated by NUL */
12227 if (*p == '.' && errno == EINVAL) {
12231 ts.tv_usec = bb_strtou(p, &p2, 10);
12233 ash_msg_and_raise_error("invalid timeout");
12235 /* normalize to usec */
12237 ash_msg_and_raise_error("invalid timeout");
12238 while (scale++ < 6)
12241 } else if (ts.tv_sec < 0 || errno) {
12242 ash_msg_and_raise_error("invalid timeout");
12244 if (!(ts.tv_sec | ts.tv_usec)) { /* both are 0? */
12245 ash_msg_and_raise_error("invalid timeout");
12254 fd = bb_strtou(optionarg, NULL, 10);
12255 if (fd < 0 || errno)
12256 ash_msg_and_raise_error("invalid file descriptor");
12262 if (prompt && isatty(fd)) {
12267 ap = (char**)arg_REPLY;
12268 ifs = bltinlookup("IFS");
12271 #if ENABLE_ASH_READ_NCHARS
12272 tcgetattr(fd, &tty);
12274 if (nchars || silent) {
12276 tty.c_lflag &= ~ICANON;
12277 tty.c_cc[VMIN] = nchars < 256 ? nchars : 255;
12280 tty.c_lflag &= ~(ECHO | ECHOK | ECHONL);
12282 /* if tcgetattr failed, tcsetattr will fail too.
12283 * Ignoring, it's harmless. */
12284 tcsetattr(fd, TCSANOW, &tty);
12291 #if ENABLE_ASH_READ_TIMEOUT
12292 if (timeout) /* NB: ensuring end_ms is nonzero */
12293 end_ms = ((unsigned)(monotonic_us() / 1000) + timeout) | 1;
12297 #if ENABLE_ASH_READ_TIMEOUT
12299 struct pollfd pfd[1];
12301 pfd[0].events = POLLIN;
12302 timeout = end_ms - (unsigned)(monotonic_us() / 1000);
12303 if ((int)timeout <= 0 /* already late? */
12304 || safe_poll(pfd, 1, timeout) != 1 /* no? wait... */
12305 ) { /* timed out! */
12306 #if ENABLE_ASH_READ_NCHARS
12307 tcsetattr(fd, TCSANOW, &old_tty);
12313 if (nonblock_safe_read(fd, &c, 1) != 1) {
12325 if (!rflag && c == '\\') {
12331 if (startword && *ifs == ' ' && strchr(ifs, c)) {
12335 if (ap[1] != NULL && strchr(ifs, c) != NULL) {
12337 setvar(*ap, stackblock(), 0);
12346 /* end of do {} while: */
12347 #if ENABLE_ASH_READ_NCHARS
12353 #if ENABLE_ASH_READ_NCHARS
12354 tcsetattr(fd, TCSANOW, &old_tty);
12358 /* Remove trailing blanks */
12359 while ((char *)stackblock() <= --p && strchr(ifs, *p) != NULL)
12361 setvar(*ap, stackblock(), 0);
12362 while (*++ap != NULL)
12363 setvar(*ap, nullstr, 0);
12368 umaskcmd(int argc UNUSED_PARAM, char **argv)
12370 static const char permuser[3] ALIGN1 = "ugo";
12371 static const char permmode[3] ALIGN1 = "rwx";
12372 static const short permmask[] ALIGN2 = {
12373 S_IRUSR, S_IWUSR, S_IXUSR,
12374 S_IRGRP, S_IWGRP, S_IXGRP,
12375 S_IROTH, S_IWOTH, S_IXOTH
12381 int symbolic_mode = 0;
12383 while (nextopt("S") != '\0') {
12394 if (symbolic_mode) {
12398 for (i = 0; i < 3; i++) {
12401 *p++ = permuser[i];
12403 for (j = 0; j < 3; j++) {
12404 if ((mask & permmask[3 * i + j]) == 0) {
12405 *p++ = permmode[j];
12413 out1fmt("%.4o\n", mask);
12416 if (isdigit((unsigned char) *ap)) {
12419 if (*ap >= '8' || *ap < '0')
12420 ash_msg_and_raise_error(illnum, argv[1]);
12421 mask = (mask << 3) + (*ap - '0');
12422 } while (*++ap != '\0');
12425 mask = ~mask & 0777;
12426 if (!bb_parse_mode(ap, &mask)) {
12427 ash_msg_and_raise_error("illegal mode: %s", ap);
12429 umask(~mask & 0777);
12438 * This code, originally by Doug Gwyn, Doug Kingston, Eric Gisin, and
12439 * Michael Rendell was ripped from pdksh 5.0.8 and hacked for use with
12440 * ash by J.T. Conklin.
12446 uint8_t cmd; /* RLIMIT_xxx fit into it */
12447 uint8_t factor_shift; /* shift by to get rlim_{cur,max} values */
12451 static const struct limits limits_tbl[] = {
12453 { RLIMIT_CPU, 0, 't' },
12455 #ifdef RLIMIT_FSIZE
12456 { RLIMIT_FSIZE, 9, 'f' },
12459 { RLIMIT_DATA, 10, 'd' },
12461 #ifdef RLIMIT_STACK
12462 { RLIMIT_STACK, 10, 's' },
12465 { RLIMIT_CORE, 9, 'c' },
12468 { RLIMIT_RSS, 10, 'm' },
12470 #ifdef RLIMIT_MEMLOCK
12471 { RLIMIT_MEMLOCK, 10, 'l' },
12473 #ifdef RLIMIT_NPROC
12474 { RLIMIT_NPROC, 0, 'p' },
12476 #ifdef RLIMIT_NOFILE
12477 { RLIMIT_NOFILE, 0, 'n' },
12480 { RLIMIT_AS, 10, 'v' },
12482 #ifdef RLIMIT_LOCKS
12483 { RLIMIT_LOCKS, 0, 'w' },
12486 static const char limits_name[] =
12488 "time(seconds)" "\0"
12490 #ifdef RLIMIT_FSIZE
12491 "file(blocks)" "\0"
12496 #ifdef RLIMIT_STACK
12500 "coredump(blocks)" "\0"
12505 #ifdef RLIMIT_MEMLOCK
12506 "locked memory(kb)" "\0"
12508 #ifdef RLIMIT_NPROC
12511 #ifdef RLIMIT_NOFILE
12517 #ifdef RLIMIT_LOCKS
12522 enum limtype { SOFT = 0x1, HARD = 0x2 };
12525 printlim(enum limtype how, const struct rlimit *limit,
12526 const struct limits *l)
12530 val = limit->rlim_max;
12532 val = limit->rlim_cur;
12534 if (val == RLIM_INFINITY)
12535 out1fmt("unlimited\n");
12537 val >>= l->factor_shift;
12538 out1fmt("%lld\n", (long long) val);
12543 ulimitcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12547 enum limtype how = SOFT | HARD;
12548 const struct limits *l;
12551 struct rlimit limit;
12554 while ((optc = nextopt("HSa"
12558 #ifdef RLIMIT_FSIZE
12564 #ifdef RLIMIT_STACK
12573 #ifdef RLIMIT_MEMLOCK
12576 #ifdef RLIMIT_NPROC
12579 #ifdef RLIMIT_NOFILE
12585 #ifdef RLIMIT_LOCKS
12603 for (l = limits_tbl; l->option != what; l++)
12606 set = *argptr ? 1 : 0;
12610 if (all || argptr[1])
12611 ash_msg_and_raise_error("too many arguments");
12612 if (strncmp(p, "unlimited\n", 9) == 0)
12613 val = RLIM_INFINITY;
12617 while ((c = *p++) >= '0' && c <= '9') {
12618 val = (val * 10) + (long)(c - '0');
12619 // val is actually 'unsigned long int' and can't get < 0
12620 if (val < (rlim_t) 0)
12624 ash_msg_and_raise_error("bad number");
12625 val <<= l->factor_shift;
12629 const char *lname = limits_name;
12630 for (l = limits_tbl; l != &limits_tbl[ARRAY_SIZE(limits_tbl)]; l++) {
12631 getrlimit(l->cmd, &limit);
12632 out1fmt("%-20s ", lname);
12633 lname += strlen(lname) + 1;
12634 printlim(how, &limit, l);
12639 getrlimit(l->cmd, &limit);
12642 limit.rlim_max = val;
12644 limit.rlim_cur = val;
12645 if (setrlimit(l->cmd, &limit) < 0)
12646 ash_msg_and_raise_error("error setting limit (%m)");
12648 printlim(how, &limit, l);
12654 /* ============ Math support */
12656 #if ENABLE_ASH_MATH_SUPPORT
12658 /* Copyright (c) 2001 Aaron Lehmann <aaronl@vitelus.com>
12660 Permission is hereby granted, free of charge, to any person obtaining
12661 a copy of this software and associated documentation files (the
12662 "Software"), to deal in the Software without restriction, including
12663 without limitation the rights to use, copy, modify, merge, publish,
12664 distribute, sublicense, and/or sell copies of the Software, and to
12665 permit persons to whom the Software is furnished to do so, subject to
12666 the following conditions:
12668 The above copyright notice and this permission notice shall be
12669 included in all copies or substantial portions of the Software.
12671 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
12672 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
12673 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
12674 IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
12675 CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
12676 TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
12677 SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
12680 /* This is my infix parser/evaluator. It is optimized for size, intended
12681 * as a replacement for yacc-based parsers. However, it may well be faster
12682 * than a comparable parser written in yacc. The supported operators are
12683 * listed in #defines below. Parens, order of operations, and error handling
12684 * are supported. This code is thread safe. The exact expression format should
12685 * be that which POSIX specifies for shells. */
12687 /* The code uses a simple two-stack algorithm. See
12688 * http://www.onthenet.com.au/~grahamis/int2008/week02/lect02.html
12689 * for a detailed explanation of the infix-to-postfix algorithm on which
12690 * this is based (this code differs in that it applies operators immediately
12691 * to the stack instead of adding them to a queue to end up with an
12694 /* To use the routine, call it with an expression string and error return
12698 * Aug 24, 2001 Manuel Novoa III
12700 * Reduced the generated code size by about 30% (i386) and fixed several bugs.
12702 * 1) In arith_apply():
12703 * a) Cached values of *numptr and &(numptr[-1]).
12704 * b) Removed redundant test for zero denominator.
12707 * a) Eliminated redundant code for processing operator tokens by moving
12708 * to a table-based implementation. Also folded handling of parens
12710 * b) Combined all 3 loops which called arith_apply to reduce generated
12711 * code size at the cost of speed.
12713 * 3) The following expressions were treated as valid by the original code:
12714 * 1() , 0! , 1 ( *3 ) .
12715 * These bugs have been fixed by internally enclosing the expression in
12716 * parens and then checking that all binary ops and right parens are
12717 * preceded by a valid expression (NUM_TOKEN).
12719 * Note: It may be desirable to replace Aaron's test for whitespace with
12720 * ctype's isspace() if it is used by another busybox applet or if additional
12721 * whitespace chars should be considered. Look below the "#include"s for a
12722 * precompiler test.
12726 * Aug 26, 2001 Manuel Novoa III
12728 * Return 0 for null expressions. Pointed out by Vladimir Oleynik.
12730 * Merge in Aaron's comments previously posted to the busybox list,
12731 * modified slightly to take account of my changes to the code.
12736 * (C) 2003 Vladimir Oleynik <dzo@simtreas.ru>
12738 * - allow access to variable,
12739 * used recursive find value indirection (c=2*2; a="c"; $((a+=2)) produce 6)
12740 * - realize assign syntax (VAR=expr, +=, *= etc)
12741 * - realize exponentiation (** operator)
12742 * - realize comma separated - expr, expr
12743 * - realise ++expr --expr expr++ expr--
12744 * - realise expr ? expr : expr (but, second expr calculate always)
12745 * - allow hexadecimal and octal numbers
12746 * - was restored loses XOR operator
12747 * - remove one goto label, added three ;-)
12748 * - protect $((num num)) as true zero expr (Manuel`s error)
12749 * - always use special isspace(), see comment from bash ;-)
12752 #define arith_isspace(arithval) \
12753 (arithval == ' ' || arithval == '\n' || arithval == '\t')
12755 typedef unsigned char operator;
12757 /* An operator's token id is a bit of a bitfield. The lower 5 bits are the
12758 * precedence, and 3 high bits are an ID unique across operators of that
12759 * precedence. The ID portion is so that multiple operators can have the
12760 * same precedence, ensuring that the leftmost one is evaluated first.
12761 * Consider * and /. */
12763 #define tok_decl(prec,id) (((id)<<5)|(prec))
12764 #define PREC(op) ((op) & 0x1F)
12766 #define TOK_LPAREN tok_decl(0,0)
12768 #define TOK_COMMA tok_decl(1,0)
12770 #define TOK_ASSIGN tok_decl(2,0)
12771 #define TOK_AND_ASSIGN tok_decl(2,1)
12772 #define TOK_OR_ASSIGN tok_decl(2,2)
12773 #define TOK_XOR_ASSIGN tok_decl(2,3)
12774 #define TOK_PLUS_ASSIGN tok_decl(2,4)
12775 #define TOK_MINUS_ASSIGN tok_decl(2,5)
12776 #define TOK_LSHIFT_ASSIGN tok_decl(2,6)
12777 #define TOK_RSHIFT_ASSIGN tok_decl(2,7)
12779 #define TOK_MUL_ASSIGN tok_decl(3,0)
12780 #define TOK_DIV_ASSIGN tok_decl(3,1)
12781 #define TOK_REM_ASSIGN tok_decl(3,2)
12783 /* all assign is right associativity and precedence eq, but (7+3)<<5 > 256 */
12784 #define convert_prec_is_assing(prec) do { if (prec == 3) prec = 2; } while (0)
12786 /* conditional is right associativity too */
12787 #define TOK_CONDITIONAL tok_decl(4,0)
12788 #define TOK_CONDITIONAL_SEP tok_decl(4,1)
12790 #define TOK_OR tok_decl(5,0)
12792 #define TOK_AND tok_decl(6,0)
12794 #define TOK_BOR tok_decl(7,0)
12796 #define TOK_BXOR tok_decl(8,0)
12798 #define TOK_BAND tok_decl(9,0)
12800 #define TOK_EQ tok_decl(10,0)
12801 #define TOK_NE tok_decl(10,1)
12803 #define TOK_LT tok_decl(11,0)
12804 #define TOK_GT tok_decl(11,1)
12805 #define TOK_GE tok_decl(11,2)
12806 #define TOK_LE tok_decl(11,3)
12808 #define TOK_LSHIFT tok_decl(12,0)
12809 #define TOK_RSHIFT tok_decl(12,1)
12811 #define TOK_ADD tok_decl(13,0)
12812 #define TOK_SUB tok_decl(13,1)
12814 #define TOK_MUL tok_decl(14,0)
12815 #define TOK_DIV tok_decl(14,1)
12816 #define TOK_REM tok_decl(14,2)
12818 /* exponent is right associativity */
12819 #define TOK_EXPONENT tok_decl(15,1)
12821 /* For now unary operators. */
12822 #define UNARYPREC 16
12823 #define TOK_BNOT tok_decl(UNARYPREC,0)
12824 #define TOK_NOT tok_decl(UNARYPREC,1)
12826 #define TOK_UMINUS tok_decl(UNARYPREC+1,0)
12827 #define TOK_UPLUS tok_decl(UNARYPREC+1,1)
12829 #define PREC_PRE (UNARYPREC+2)
12831 #define TOK_PRE_INC tok_decl(PREC_PRE, 0)
12832 #define TOK_PRE_DEC tok_decl(PREC_PRE, 1)
12834 #define PREC_POST (UNARYPREC+3)
12836 #define TOK_POST_INC tok_decl(PREC_POST, 0)
12837 #define TOK_POST_DEC tok_decl(PREC_POST, 1)
12839 #define SPEC_PREC (UNARYPREC+4)
12841 #define TOK_NUM tok_decl(SPEC_PREC, 0)
12842 #define TOK_RPAREN tok_decl(SPEC_PREC, 1)
12844 #define NUMPTR (*numstackptr)
12847 tok_have_assign(operator op)
12849 operator prec = PREC(op);
12851 convert_prec_is_assing(prec);
12852 return (prec == PREC(TOK_ASSIGN) ||
12853 prec == PREC_PRE || prec == PREC_POST);
12857 is_right_associativity(operator prec)
12859 return (prec == PREC(TOK_ASSIGN) || prec == PREC(TOK_EXPONENT)
12860 || prec == PREC(TOK_CONDITIONAL));
12865 arith_t contidional_second_val;
12866 char contidional_second_val_initialized;
12867 char *var; /* if NULL then is regular number,
12868 else is variable name */
12871 typedef struct chk_var_recursive_looped_t {
12873 struct chk_var_recursive_looped_t *next;
12874 } chk_var_recursive_looped_t;
12876 static chk_var_recursive_looped_t *prev_chk_var_recursive;
12879 arith_lookup_val(v_n_t *t)
12882 const char * p = lookupvar(t->var);
12887 /* recursive try as expression */
12888 chk_var_recursive_looped_t *cur;
12889 chk_var_recursive_looped_t cur_save;
12891 for (cur = prev_chk_var_recursive; cur; cur = cur->next) {
12892 if (strcmp(cur->var, t->var) == 0) {
12893 /* expression recursion loop detected */
12897 /* save current lookuped var name */
12898 cur = prev_chk_var_recursive;
12899 cur_save.var = t->var;
12900 cur_save.next = cur;
12901 prev_chk_var_recursive = &cur_save;
12903 t->val = arith (p, &errcode);
12904 /* restore previous ptr after recursiving */
12905 prev_chk_var_recursive = cur;
12908 /* allow undefined var as 0 */
12914 /* "applying" a token means performing it on the top elements on the integer
12915 * stack. For a unary operator it will only change the top element, but a
12916 * binary operator will pop two arguments and push a result */
12918 arith_apply(operator op, v_n_t *numstack, v_n_t **numstackptr)
12921 arith_t numptr_val, rez;
12922 int ret_arith_lookup_val;
12924 /* There is no operator that can work without arguments */
12925 if (NUMPTR == numstack) goto err;
12926 numptr_m1 = NUMPTR - 1;
12928 /* check operand is var with noninteger value */
12929 ret_arith_lookup_val = arith_lookup_val(numptr_m1);
12930 if (ret_arith_lookup_val)
12931 return ret_arith_lookup_val;
12933 rez = numptr_m1->val;
12934 if (op == TOK_UMINUS)
12936 else if (op == TOK_NOT)
12938 else if (op == TOK_BNOT)
12940 else if (op == TOK_POST_INC || op == TOK_PRE_INC)
12942 else if (op == TOK_POST_DEC || op == TOK_PRE_DEC)
12944 else if (op != TOK_UPLUS) {
12945 /* Binary operators */
12947 /* check and binary operators need two arguments */
12948 if (numptr_m1 == numstack) goto err;
12950 /* ... and they pop one */
12953 if (op == TOK_CONDITIONAL) {
12954 if (!numptr_m1->contidional_second_val_initialized) {
12955 /* protect $((expr1 ? expr2)) without ": expr" */
12958 rez = numptr_m1->contidional_second_val;
12959 } else if (numptr_m1->contidional_second_val_initialized) {
12960 /* protect $((expr1 : expr2)) without "expr ? " */
12963 numptr_m1 = NUMPTR - 1;
12964 if (op != TOK_ASSIGN) {
12965 /* check operand is var with noninteger value for not '=' */
12966 ret_arith_lookup_val = arith_lookup_val(numptr_m1);
12967 if (ret_arith_lookup_val)
12968 return ret_arith_lookup_val;
12970 if (op == TOK_CONDITIONAL) {
12971 numptr_m1->contidional_second_val = rez;
12973 rez = numptr_m1->val;
12974 if (op == TOK_BOR || op == TOK_OR_ASSIGN)
12976 else if (op == TOK_OR)
12977 rez = numptr_val || rez;
12978 else if (op == TOK_BAND || op == TOK_AND_ASSIGN)
12980 else if (op == TOK_BXOR || op == TOK_XOR_ASSIGN)
12982 else if (op == TOK_AND)
12983 rez = rez && numptr_val;
12984 else if (op == TOK_EQ)
12985 rez = (rez == numptr_val);
12986 else if (op == TOK_NE)
12987 rez = (rez != numptr_val);
12988 else if (op == TOK_GE)
12989 rez = (rez >= numptr_val);
12990 else if (op == TOK_RSHIFT || op == TOK_RSHIFT_ASSIGN)
12991 rez >>= numptr_val;
12992 else if (op == TOK_LSHIFT || op == TOK_LSHIFT_ASSIGN)
12993 rez <<= numptr_val;
12994 else if (op == TOK_GT)
12995 rez = (rez > numptr_val);
12996 else if (op == TOK_LT)
12997 rez = (rez < numptr_val);
12998 else if (op == TOK_LE)
12999 rez = (rez <= numptr_val);
13000 else if (op == TOK_MUL || op == TOK_MUL_ASSIGN)
13002 else if (op == TOK_ADD || op == TOK_PLUS_ASSIGN)
13004 else if (op == TOK_SUB || op == TOK_MINUS_ASSIGN)
13006 else if (op == TOK_ASSIGN || op == TOK_COMMA)
13008 else if (op == TOK_CONDITIONAL_SEP) {
13009 if (numptr_m1 == numstack) {
13010 /* protect $((expr : expr)) without "expr ? " */
13013 numptr_m1->contidional_second_val_initialized = op;
13014 numptr_m1->contidional_second_val = numptr_val;
13015 } else if (op == TOK_CONDITIONAL) {
13017 numptr_val : numptr_m1->contidional_second_val;
13018 } else if (op == TOK_EXPONENT) {
13019 if (numptr_val < 0)
13020 return -3; /* exponent less than 0 */
13025 while (numptr_val--)
13029 } else if (numptr_val==0) /* zero divisor check */
13031 else if (op == TOK_DIV || op == TOK_DIV_ASSIGN)
13033 else if (op == TOK_REM || op == TOK_REM_ASSIGN)
13036 if (tok_have_assign(op)) {
13037 char buf[sizeof(arith_t_type)*3 + 2];
13039 if (numptr_m1->var == NULL) {
13043 /* save to shell variable */
13044 #if ENABLE_ASH_MATH_SUPPORT_64
13045 snprintf(buf, sizeof(buf), "%lld", (arith_t_type) rez);
13047 snprintf(buf, sizeof(buf), "%ld", (arith_t_type) rez);
13049 setvar(numptr_m1->var, buf, 0);
13050 /* after saving, make previous value for v++ or v-- */
13051 if (op == TOK_POST_INC)
13053 else if (op == TOK_POST_DEC)
13056 numptr_m1->val = rez;
13057 /* protect geting var value, is number now */
13058 numptr_m1->var = NULL;
13064 /* longest must be first */
13065 static const char op_tokens[] ALIGN1 = {
13066 '<','<','=',0, TOK_LSHIFT_ASSIGN,
13067 '>','>','=',0, TOK_RSHIFT_ASSIGN,
13068 '<','<', 0, TOK_LSHIFT,
13069 '>','>', 0, TOK_RSHIFT,
13070 '|','|', 0, TOK_OR,
13071 '&','&', 0, TOK_AND,
13072 '!','=', 0, TOK_NE,
13073 '<','=', 0, TOK_LE,
13074 '>','=', 0, TOK_GE,
13075 '=','=', 0, TOK_EQ,
13076 '|','=', 0, TOK_OR_ASSIGN,
13077 '&','=', 0, TOK_AND_ASSIGN,
13078 '*','=', 0, TOK_MUL_ASSIGN,
13079 '/','=', 0, TOK_DIV_ASSIGN,
13080 '%','=', 0, TOK_REM_ASSIGN,
13081 '+','=', 0, TOK_PLUS_ASSIGN,
13082 '-','=', 0, TOK_MINUS_ASSIGN,
13083 '-','-', 0, TOK_POST_DEC,
13084 '^','=', 0, TOK_XOR_ASSIGN,
13085 '+','+', 0, TOK_POST_INC,
13086 '*','*', 0, TOK_EXPONENT,
13090 '=', 0, TOK_ASSIGN,
13102 '?', 0, TOK_CONDITIONAL,
13103 ':', 0, TOK_CONDITIONAL_SEP,
13104 ')', 0, TOK_RPAREN,
13105 '(', 0, TOK_LPAREN,
13109 #define endexpression (&op_tokens[sizeof(op_tokens)-7])
13112 arith(const char *expr, int *perrcode)
13114 char arithval; /* Current character under analysis */
13115 operator lasttok, op;
13117 operator *stack, *stackptr;
13118 const char *p = endexpression;
13120 v_n_t *numstack, *numstackptr;
13121 unsigned datasizes = strlen(expr) + 2;
13123 /* Stack of integers */
13124 /* The proof that there can be no more than strlen(startbuf)/2+1 integers
13125 * in any given correct or incorrect expression is left as an exercise to
13127 numstackptr = numstack = alloca((datasizes / 2) * sizeof(numstack[0]));
13128 /* Stack of operator tokens */
13129 stackptr = stack = alloca(datasizes * sizeof(stack[0]));
13131 *stackptr++ = lasttok = TOK_LPAREN; /* start off with a left paren */
13132 *perrcode = errcode = 0;
13136 if (arithval == 0) {
13137 if (p == endexpression) {
13138 /* Null expression. */
13142 /* This is only reached after all tokens have been extracted from the
13143 * input stream. If there are still tokens on the operator stack, they
13144 * are to be applied in order. At the end, there should be a final
13145 * result on the integer stack */
13147 if (expr != endexpression + 1) {
13148 /* If we haven't done so already, */
13149 /* append a closing right paren */
13150 expr = endexpression;
13151 /* and let the loop process it. */
13154 /* At this point, we're done with the expression. */
13155 if (numstackptr != numstack+1) {
13156 /* ... but if there isn't, it's bad */
13161 if (numstack->var) {
13162 /* expression is $((var)) only, lookup now */
13163 errcode = arith_lookup_val(numstack);
13166 *perrcode = errcode;
13167 return numstack->val;
13170 /* Continue processing the expression. */
13171 if (arith_isspace(arithval)) {
13172 /* Skip whitespace */
13175 p = endofname(expr);
13177 size_t var_name_size = (p-expr) + 1; /* trailing zero */
13179 numstackptr->var = alloca(var_name_size);
13180 safe_strncpy(numstackptr->var, expr, var_name_size);
13183 numstackptr->contidional_second_val_initialized = 0;
13188 if (isdigit(arithval)) {
13189 numstackptr->var = NULL;
13190 #if ENABLE_ASH_MATH_SUPPORT_64
13191 numstackptr->val = strtoll(expr, (char **) &expr, 0);
13193 numstackptr->val = strtol(expr, (char **) &expr, 0);
13197 for (p = op_tokens; ; p++) {
13201 /* strange operator not found */
13204 for (o = expr; *p && *o == *p; p++)
13211 /* skip tail uncompared token */
13214 /* skip zero delim */
13219 /* post grammar: a++ reduce to num */
13220 if (lasttok == TOK_POST_INC || lasttok == TOK_POST_DEC)
13223 /* Plus and minus are binary (not unary) _only_ if the last
13224 * token was as number, or a right paren (which pretends to be
13225 * a number, since it evaluates to one). Think about it.
13226 * It makes sense. */
13227 if (lasttok != TOK_NUM) {
13243 /* We don't want a unary operator to cause recursive descent on the
13244 * stack, because there can be many in a row and it could cause an
13245 * operator to be evaluated before its argument is pushed onto the
13246 * integer stack. */
13247 /* But for binary operators, "apply" everything on the operator
13248 * stack until we find an operator with a lesser priority than the
13249 * one we have just extracted. */
13250 /* Left paren is given the lowest priority so it will never be
13251 * "applied" in this way.
13252 * if associativity is right and priority eq, applied also skip
13255 if ((prec > 0 && prec < UNARYPREC) || prec == SPEC_PREC) {
13256 /* not left paren or unary */
13257 if (lasttok != TOK_NUM) {
13258 /* binary op must be preceded by a num */
13261 while (stackptr != stack) {
13262 if (op == TOK_RPAREN) {
13263 /* The algorithm employed here is simple: while we don't
13264 * hit an open paren nor the bottom of the stack, pop
13265 * tokens and apply them */
13266 if (stackptr[-1] == TOK_LPAREN) {
13268 /* Any operator directly after a */
13270 /* close paren should consider itself binary */
13274 operator prev_prec = PREC(stackptr[-1]);
13276 convert_prec_is_assing(prec);
13277 convert_prec_is_assing(prev_prec);
13278 if (prev_prec < prec)
13280 /* check right assoc */
13281 if (prev_prec == prec && is_right_associativity(prec))
13284 errcode = arith_apply(*--stackptr, numstack, &numstackptr);
13285 if (errcode) goto ret;
13287 if (op == TOK_RPAREN) {
13292 /* Push this operator to the stack and remember it. */
13293 *stackptr++ = lasttok = op;
13298 #endif /* ASH_MATH_SUPPORT */
13301 /* ============ main() and helpers */
13304 * Called to exit the shell.
13306 static void exitshell(void) NORETURN;
13314 status = exitstatus;
13315 TRACE(("pid %d, exitshell(%d)\n", getpid(), status));
13316 if (setjmp(loc.loc)) {
13317 if (exception == EXEXIT)
13318 /* dash bug: it just does _exit(exitstatus) here
13319 * but we have to do setjobctl(0) first!
13320 * (bug is still not fixed in dash-0.5.3 - if you run dash
13321 * under Midnight Commander, on exit from dash MC is backgrounded) */
13322 status = exitstatus;
13325 exception_handler = &loc;
13331 flush_stdout_stderr();
13341 /* from input.c: */
13342 basepf.nextc = basepf.buf = basebuf;
13345 signal(SIGCHLD, SIG_DFL);
13350 char ppid[sizeof(int)*3 + 1];
13352 struct stat st1, st2;
13355 for (envp = environ; envp && *envp; envp++) {
13356 if (strchr(*envp, '=')) {
13357 setvareq(*envp, VEXPORT|VTEXTFIXED);
13361 snprintf(ppid, sizeof(ppid), "%u", (unsigned) getppid());
13362 setvar("PPID", ppid, 0);
13364 p = lookupvar("PWD");
13366 if (*p != '/' || stat(p, &st1) || stat(".", &st2)
13367 || st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino)
13374 * Process the shell command line arguments.
13377 procargs(char **argv)
13380 const char *xminusc;
13385 /* if (xargv[0]) - mmm, this is always true! */
13387 for (i = 0; i < NOPTS; i++)
13391 /* it already printed err message */
13392 raise_exception(EXERROR);
13396 if (*xargv == NULL) {
13398 ash_msg_and_raise_error(bb_msg_requires_arg, "-c");
13401 if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
13405 for (i = 0; i < NOPTS; i++)
13406 if (optlist[i] == 2)
13411 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
13416 } else if (!sflag) {
13417 setinputfile(*xargv, 0);
13420 commandname = arg0;
13423 shellparam.p = xargv;
13424 #if ENABLE_ASH_GETOPTS
13425 shellparam.optind = 1;
13426 shellparam.optoff = -1;
13428 /* assert(shellparam.malloced == 0 && shellparam.nparam == 0); */
13430 shellparam.nparam++;
13437 * Read /etc/profile or .profile.
13440 read_profile(const char *name)
13444 if (setinputfile(name, INPUT_PUSH_FILE | INPUT_NOFILE_OK) < 0)
13453 * This routine is called when an error or an interrupt occurs in an
13454 * interactive shell and control is returned to the main command loop.
13462 /* from input.c: */
13463 parselleft = parsenleft = 0; /* clear input buffer */
13465 /* from parser.c: */
13468 /* from redir.c: */
13473 static short profile_buf[16384];
13474 extern int etext();
13478 * Main routine. We initialize things, parse the arguments, execute
13479 * profiles if we're a login shell, and then call cmdloop to execute
13480 * commands. The setjmp call sets up the location to jump to when an
13481 * exception occurs. When an exception occurs the variable "state"
13482 * is used to figure out how far we had gotten.
13484 int ash_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
13485 int ash_main(int argc UNUSED_PARAM, char **argv)
13488 volatile int state;
13489 struct jmploc jmploc;
13490 struct stackmark smark;
13492 /* Initialize global data */
13496 #if ENABLE_ASH_ALIAS
13502 monitor(4, etext, profile_buf, sizeof(profile_buf), 50);
13505 #if ENABLE_FEATURE_EDITING
13506 line_input_state = new_line_input_t(FOR_SHELL | WITH_PATH_LOOKUP);
13509 if (setjmp(jmploc.loc)) {
13519 if (e == EXEXIT || s == 0 || iflag == 0 || shlvl)
13523 outcslow('\n', stderr);
13525 popstackmark(&smark);
13526 FORCE_INT_ON; /* enable interrupts */
13535 exception_handler = &jmploc;
13538 trace_puts("Shell args: ");
13539 trace_puts_args(argv);
13541 rootpid = getpid();
13543 #if ENABLE_ASH_RANDOM_SUPPORT
13544 /* Can use monotonic_ns() for better randomness but for now it is
13545 * not used anywhere else in busybox... so avoid bloat */
13546 random_galois_LFSR = random_LCG = rootpid + monotonic_us();
13549 setstackmark(&smark);
13552 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
13554 const char *hp = lookupvar("HISTFILE");
13557 hp = lookupvar("HOME");
13559 char *defhp = concat_path_file(hp, ".ash_history");
13560 setvar("HISTFILE", defhp, 0);
13566 if (argv[0] && argv[0][0] == '-')
13570 read_profile("/etc/profile");
13573 read_profile(".profile");
13579 getuid() == geteuid() && getgid() == getegid() &&
13583 shinit = lookupvar("ENV");
13584 if (shinit != NULL && *shinit != '\0') {
13585 read_profile(shinit);
13591 evalstring(minusc, 0);
13593 if (sflag || minusc == NULL) {
13594 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
13596 const char *hp = lookupvar("HISTFILE");
13599 line_input_state->hist_file = hp;
13602 state4: /* XXX ??? - why isn't this before the "if" statement */
13610 extern void _mcleanup(void);
13619 const char *applet_name = "debug stuff usage";
13620 int main(int argc, char **argv)
13622 return ash_main(argc, argv);
13628 * Copyright (c) 1989, 1991, 1993, 1994
13629 * The Regents of the University of California. All rights reserved.
13631 * This code is derived from software contributed to Berkeley by
13632 * Kenneth Almquist.
13634 * Redistribution and use in source and binary forms, with or without
13635 * modification, are permitted provided that the following conditions
13637 * 1. Redistributions of source code must retain the above copyright
13638 * notice, this list of conditions and the following disclaimer.
13639 * 2. Redistributions in binary form must reproduce the above copyright
13640 * notice, this list of conditions and the following disclaimer in the
13641 * documentation and/or other materials provided with the distribution.
13642 * 3. Neither the name of the University nor the names of its contributors
13643 * may be used to endorse or promote products derived from this software
13644 * without specific prior written permission.
13646 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
13647 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
13648 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
13649 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
13650 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
13651 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
13652 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
13653 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
13654 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
13655 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF