1 /* vi: set sw=4 ts=4: */
3 * ash shell port for busybox
5 * This code is derived from software contributed to Berkeley by
8 * Original BSD copyright notice is retained at the end of this file.
10 * Copyright (c) 1989, 1991, 1993, 1994
11 * The Regents of the University of California. All rights reserved.
13 * Copyright (c) 1997-2005 Herbert Xu <herbert@gondor.apana.org.au>
14 * was re-ported from NetBSD and debianized.
16 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
20 * The following should be set to reflect the type of system you have:
21 * JOBS -> 1 if you have Berkeley job control, 0 otherwise.
22 * define SYSV if you are running under System V.
23 * define DEBUG=1 to compile in debugging ('set -o debug' to turn on)
24 * define DEBUG=2 to compile in and turn on debugging.
26 * When debugging is on (DEBUG is 1 and "set -o debug" was executed),
27 * debugging info will be written to ./trace and a quit signal
28 * will generate a core dump.
31 /* Tweak debug output verbosity here */
38 #define JOBS ENABLE_ASH_JOB_CONTROL
43 #include <sys/times.h>
45 #include "busybox.h" /* for applet_names */
48 #include "shell_common.h"
49 #if ENABLE_SH_MATH_SUPPORT
52 #if ENABLE_ASH_RANDOM_SUPPORT
55 # define CLEAR_RANDOM_T(rnd) ((void)0)
58 #include "NUM_APPLETS.h"
60 /* STANDALONE does not make sense, and won't compile */
61 # undef CONFIG_FEATURE_SH_STANDALONE
62 # undef ENABLE_FEATURE_SH_STANDALONE
63 # undef IF_FEATURE_SH_STANDALONE
64 # undef IF_NOT_FEATURE_SH_STANDALONE
65 # define ENABLE_FEATURE_SH_STANDALONE 0
66 # define IF_FEATURE_SH_STANDALONE(...)
67 # define IF_NOT_FEATURE_SH_STANDALONE(...) __VA_ARGS__
71 # define PIPE_BUF 4096 /* amount of buffering in a pipe */
75 # error "Do not even bother, ash will not run on NOMMU machine"
81 //config: depends on !NOMMU
83 //config: Tha 'ash' shell adds about 60k in the default configuration and is
84 //config: the most complete and most pedantically correct shell included with
85 //config: busybox. This shell is actually a derivative of the Debian 'dash'
86 //config: shell (by Herbert Xu), which was created by porting the 'ash' shell
87 //config: (written by Kenneth Almquist) from NetBSD.
89 //config:config ASH_BASH_COMPAT
90 //config: bool "bash-compatible extensions"
92 //config: depends on ASH
94 //config: Enable bash-compatible extensions.
96 //config:config ASH_IDLE_TIMEOUT
97 //config: bool "Idle timeout variable"
99 //config: depends on ASH
101 //config: Enables bash-like auto-logout after $TMOUT seconds of idle time.
103 //config:config ASH_JOB_CONTROL
104 //config: bool "Job control"
106 //config: depends on ASH
108 //config: Enable job control in the ash shell.
110 //config:config ASH_ALIAS
111 //config: bool "Alias support"
113 //config: depends on ASH
115 //config: Enable alias support in the ash shell.
117 //config:config ASH_GETOPTS
118 //config: bool "Builtin getopt to parse positional parameters"
120 //config: depends on ASH
122 //config: Enable support for getopts builtin in ash.
124 //config:config ASH_BUILTIN_ECHO
125 //config: bool "Builtin version of 'echo'"
127 //config: depends on ASH
129 //config: Enable support for echo builtin in ash.
131 //config:config ASH_BUILTIN_PRINTF
132 //config: bool "Builtin version of 'printf'"
134 //config: depends on ASH
136 //config: Enable support for printf builtin in ash.
138 //config:config ASH_BUILTIN_TEST
139 //config: bool "Builtin version of 'test'"
141 //config: depends on ASH
143 //config: Enable support for test builtin in ash.
145 //config:config ASH_CMDCMD
146 //config: bool "'command' command to override shell builtins"
148 //config: depends on ASH
150 //config: Enable support for the ash 'command' builtin, which allows
151 //config: you to run the specified command with the specified arguments,
152 //config: even when there is an ash builtin command with the same name.
154 //config:config ASH_MAIL
155 //config: bool "Check for new mail on interactive shells"
157 //config: depends on ASH
159 //config: Enable "check for new mail" function in the ash shell.
161 //config:config ASH_OPTIMIZE_FOR_SIZE
162 //config: bool "Optimize for size instead of speed"
164 //config: depends on ASH
166 //config: Compile ash for reduced size at the price of speed.
168 //config:config ASH_RANDOM_SUPPORT
169 //config: bool "Pseudorandom generator and $RANDOM variable"
171 //config: depends on ASH
173 //config: Enable pseudorandom generator and dynamic variable "$RANDOM".
174 //config: Each read of "$RANDOM" will generate a new pseudorandom value.
175 //config: You can reset the generator by using a specified start value.
176 //config: After "unset RANDOM" the generator will switch off and this
177 //config: variable will no longer have special treatment.
179 //config:config ASH_EXPAND_PRMT
180 //config: bool "Expand prompt string"
182 //config: depends on ASH
184 //config: "PS#" may contain volatile content, such as backquote commands.
185 //config: This option recreates the prompt string from the environment
186 //config: variable each time it is displayed.
189 //applet:IF_ASH(APPLET(ash, BB_DIR_BIN, BB_SUID_DROP))
190 //applet:IF_FEATURE_SH_IS_ASH(APPLET_ODDNAME(sh, ash, BB_DIR_BIN, BB_SUID_DROP, sh))
191 //applet:IF_FEATURE_BASH_IS_ASH(APPLET_ODDNAME(bash, ash, BB_DIR_BIN, BB_SUID_DROP, bash))
193 //kbuild:lib-$(CONFIG_ASH) += ash.o ash_ptr_hack.o shell_common.o
194 //kbuild:lib-$(CONFIG_ASH_RANDOM_SUPPORT) += random.o
197 /* ============ Hash table sizes. Configurable. */
201 #define CMDTABLESIZE 31 /* should be prime */
204 /* ============ Shell options */
206 static const char *const optletters_optnames[] = {
221 #if ENABLE_ASH_BASH_COMPAT
230 #define optletters(n) optletters_optnames[n][0]
231 #define optnames(n) (optletters_optnames[n] + 1)
233 enum { NOPTS = ARRAY_SIZE(optletters_optnames) };
236 /* ============ Misc data */
238 #define msg_illnum "Illegal number: %s"
241 * We enclose jmp_buf in a structure so that we can declare pointers to
242 * jump locations. The global variable handler contains the location to
243 * jump to when an exception occurs, and the global variable exception_type
244 * contains a code identifying the exception. To implement nested
245 * exception handlers, the user should save the value of handler on entry
246 * to an inner scope, set handler to point to a jmploc structure for the
247 * inner scope, and restore handler on exit from the scope.
253 struct globals_misc {
254 /* pid of main shell */
256 /* shell level: 0 for the main shell, 1 for its children, and so on */
258 #define rootshell (!shlvl)
259 char *minusc; /* argument to -c option */
261 char *curdir; // = nullstr; /* current working directory */
262 char *physdir; // = nullstr; /* physical working directory */
264 char *arg0; /* value of $0 */
266 struct jmploc *exception_handler;
268 volatile int suppress_int; /* counter */
269 volatile /*sig_atomic_t*/ smallint pending_int; /* 1 = got SIGINT */
270 /* last pending signal */
271 volatile /*sig_atomic_t*/ smallint pending_sig;
272 smallint exception_type; /* kind of exception (0..5) */
274 #define EXINT 0 /* SIGINT received */
275 #define EXERROR 1 /* a generic error */
276 #define EXSHELLPROC 2 /* execute a shell procedure */
277 #define EXEXEC 3 /* command execution failed */
278 #define EXEXIT 4 /* exit the shell */
279 #define EXSIG 5 /* trapped signal in wait(1) */
282 char nullstr[1]; /* zero length string */
285 #define eflag optlist[0]
286 #define fflag optlist[1]
287 #define Iflag optlist[2]
288 #define iflag optlist[3]
289 #define mflag optlist[4]
290 #define nflag optlist[5]
291 #define sflag optlist[6]
292 #define xflag optlist[7]
293 #define vflag optlist[8]
294 #define Cflag optlist[9]
295 #define aflag optlist[10]
296 #define bflag optlist[11]
297 #define uflag optlist[12]
298 #define viflag optlist[13]
299 #if ENABLE_ASH_BASH_COMPAT
300 # define pipefail optlist[14]
305 # define nolog optlist[14 + ENABLE_ASH_BASH_COMPAT]
306 # define debug optlist[15 + ENABLE_ASH_BASH_COMPAT]
309 /* trap handler commands */
311 * Sigmode records the current value of the signal handlers for the various
312 * modes. A value of zero means that the current handler is not known.
313 * S_HARD_IGN indicates that the signal was ignored on entry to the shell.
315 char sigmode[NSIG - 1];
316 #define S_DFL 1 /* default signal handling (SIG_DFL) */
317 #define S_CATCH 2 /* signal is caught */
318 #define S_IGN 3 /* signal is ignored (SIG_IGN) */
319 #define S_HARD_IGN 4 /* signal is ignored permenantly */
321 /* indicates specified signal received */
322 uint8_t gotsig[NSIG - 1]; /* offset by 1: "signal" 0 is meaningless */
323 uint8_t may_have_traps; /* 0: definitely no traps are set, 1: some traps may be set */
325 char **trap_ptr; /* used only by "trap hack" */
327 /* Rarely referenced stuff */
328 #if ENABLE_ASH_RANDOM_SUPPORT
331 pid_t backgndpid; /* pid of last background process */
332 smallint job_warning; /* user was warned about stopped jobs (can be 2, 1 or 0). */
334 extern struct globals_misc *const ash_ptr_to_globals_misc;
335 #define G_misc (*ash_ptr_to_globals_misc)
336 #define rootpid (G_misc.rootpid )
337 #define shlvl (G_misc.shlvl )
338 #define minusc (G_misc.minusc )
339 #define curdir (G_misc.curdir )
340 #define physdir (G_misc.physdir )
341 #define arg0 (G_misc.arg0 )
342 #define exception_handler (G_misc.exception_handler)
343 #define exception_type (G_misc.exception_type )
344 #define suppress_int (G_misc.suppress_int )
345 #define pending_int (G_misc.pending_int )
346 #define pending_sig (G_misc.pending_sig )
347 #define isloginsh (G_misc.isloginsh )
348 #define nullstr (G_misc.nullstr )
349 #define optlist (G_misc.optlist )
350 #define sigmode (G_misc.sigmode )
351 #define gotsig (G_misc.gotsig )
352 #define may_have_traps (G_misc.may_have_traps )
353 #define trap (G_misc.trap )
354 #define trap_ptr (G_misc.trap_ptr )
355 #define random_gen (G_misc.random_gen )
356 #define backgndpid (G_misc.backgndpid )
357 #define job_warning (G_misc.job_warning)
358 #define INIT_G_misc() do { \
359 (*(struct globals_misc**)&ash_ptr_to_globals_misc) = xzalloc(sizeof(G_misc)); \
367 /* ============ DEBUG */
369 static void trace_printf(const char *fmt, ...);
370 static void trace_vprintf(const char *fmt, va_list va);
371 # define TRACE(param) trace_printf param
372 # define TRACEV(param) trace_vprintf param
373 # define close(fd) do { \
375 if (close(dfd) < 0) \
376 bb_error_msg("bug on %d: closing %d(0x%x)", \
377 __LINE__, dfd, dfd); \
380 # define TRACE(param)
381 # define TRACEV(param)
385 /* ============ Utility functions */
386 #define xbarrier() do { __asm__ __volatile__ ("": : :"memory"); } while (0)
388 static int isdigit_str9(const char *str)
390 int maxlen = 9 + 1; /* max 9 digits: 999999999 */
391 while (--maxlen && isdigit(*str))
393 return (*str == '\0');
396 static const char *var_end(const char *var)
405 /* ============ Interrupts / exceptions */
407 static void exitshell(void) NORETURN;
410 * These macros allow the user to suspend the handling of interrupt signals
411 * over a period of time. This is similar to SIGHOLD or to sigblock, but
412 * much more efficient and portable. (But hacking the kernel is so much
413 * more fun than worrying about efficiency and portability. :-))
415 #define INT_OFF do { \
421 * Called to raise an exception. Since C doesn't include exceptions, we
422 * just do a longjmp to the exception handler. The type of exception is
423 * stored in the global variable "exception_type".
425 static void raise_exception(int) NORETURN;
427 raise_exception(int e)
430 if (exception_handler == NULL)
435 longjmp(exception_handler->loc, 1);
438 #define raise_exception(e) do { \
439 TRACE(("raising exception %d on line %d\n", (e), __LINE__)); \
440 raise_exception(e); \
445 * Called from trap.c when a SIGINT is received. (If the user specifies
446 * that SIGINT is to be trapped or ignored using the trap builtin, then
447 * this routine is not called.) Suppressint is nonzero when interrupts
448 * are held using the INT_OFF macro. (The test for iflag is just
449 * defensive programming.)
451 static void raise_interrupt(void) NORETURN;
453 raise_interrupt(void)
458 /* Signal is not automatically unmasked after it is raised,
459 * do it ourself - unmask all signals */
460 sigprocmask_allsigs(SIG_UNBLOCK);
461 /* pending_sig = 0; - now done in signal_handler() */
464 if (gotsig[SIGINT - 1] && !trap[SIGINT]) {
465 if (!(rootshell && iflag)) {
466 /* Kill ourself with SIGINT */
467 signal(SIGINT, SIG_DFL);
472 raise_exception(ex_type);
476 #define raise_interrupt() do { \
477 TRACE(("raising interrupt on line %d\n", __LINE__)); \
482 static IF_ASH_OPTIMIZE_FOR_SIZE(inline) void
486 if (--suppress_int == 0 && pending_int) {
490 #define INT_ON int_on()
491 static IF_ASH_OPTIMIZE_FOR_SIZE(inline) void
499 #define FORCE_INT_ON force_int_on()
501 #define SAVE_INT(v) ((v) = suppress_int)
503 #define RESTORE_INT(v) do { \
505 suppress_int = (v); \
506 if (suppress_int == 0 && pending_int) \
511 /* ============ Stdout/stderr output */
514 outstr(const char *p, FILE *file)
522 flush_stdout_stderr(void)
530 outcslow(int c, FILE *dest)
538 static int out1fmt(const char *, ...) __attribute__((__format__(__printf__,1,2)));
540 out1fmt(const char *fmt, ...)
547 r = vprintf(fmt, ap);
553 static int fmtstr(char *, size_t, const char *, ...) __attribute__((__format__(__printf__,3,4)));
555 fmtstr(char *outbuf, size_t length, const char *fmt, ...)
562 ret = vsnprintf(outbuf, length, fmt, ap);
569 out1str(const char *p)
575 out2str(const char *p)
578 flush_stdout_stderr();
582 /* ============ Parser structures */
584 /* control characters in argument strings */
585 #define CTL_FIRST CTLESC
586 #define CTLESC ((unsigned char)'\201') /* escape next character */
587 #define CTLVAR ((unsigned char)'\202') /* variable defn */
588 #define CTLENDVAR ((unsigned char)'\203')
589 #define CTLBACKQ ((unsigned char)'\204')
590 #define CTLQUOTE 01 /* ored with CTLBACKQ code if in quotes */
591 /* CTLBACKQ | CTLQUOTE == '\205' */
592 #define CTLARI ((unsigned char)'\206') /* arithmetic expression */
593 #define CTLENDARI ((unsigned char)'\207')
594 #define CTLQUOTEMARK ((unsigned char)'\210')
595 #define CTL_LAST CTLQUOTEMARK
597 /* variable substitution byte (follows CTLVAR) */
598 #define VSTYPE 0x0f /* type of variable substitution */
599 #define VSNUL 0x10 /* colon--treat the empty string as unset */
600 #define VSQUOTE 0x80 /* inside double quotes--suppress splitting */
602 /* values of VSTYPE field */
603 #define VSNORMAL 0x1 /* normal variable: $var or ${var} */
604 #define VSMINUS 0x2 /* ${var-text} */
605 #define VSPLUS 0x3 /* ${var+text} */
606 #define VSQUESTION 0x4 /* ${var?message} */
607 #define VSASSIGN 0x5 /* ${var=text} */
608 #define VSTRIMRIGHT 0x6 /* ${var%pattern} */
609 #define VSTRIMRIGHTMAX 0x7 /* ${var%%pattern} */
610 #define VSTRIMLEFT 0x8 /* ${var#pattern} */
611 #define VSTRIMLEFTMAX 0x9 /* ${var##pattern} */
612 #define VSLENGTH 0xa /* ${#var} */
613 #if ENABLE_ASH_BASH_COMPAT
614 #define VSSUBSTR 0xc /* ${var:position:length} */
615 #define VSREPLACE 0xd /* ${var/pattern/replacement} */
616 #define VSREPLACEALL 0xe /* ${var//pattern/replacement} */
619 static const char dolatstr[] ALIGN1 = {
620 CTLVAR, VSNORMAL|VSQUOTE, '@', '=', '\0'
640 #if ENABLE_ASH_BASH_COMPAT
657 smallint type; /* Nxxxx */
660 union node *redirect;
665 smallint pipe_backgnd;
666 struct nodelist *cmdlist;
672 union node *redirect;
685 union node *elsepart;
712 struct nodelist *backquote;
715 /* nfile and ndup layout must match!
716 * NTOFD (>&fdnum) uses ndup structure, but we may discover mid-flight
717 * that it is actually NTO2 (>&file), and change its type.
734 char *_unused_expfname;
753 struct nredir nredir;
754 struct nbinary nbinary;
758 struct nclist nclist;
767 * NODE_EOF is returned by parsecmd when it encounters an end of file.
768 * It must be distinct from NULL.
770 #define NODE_EOF ((union node *) -1L)
773 struct nodelist *next;
786 freefunc(struct funcnode *f)
788 if (f && --f->count < 0)
793 /* ============ Debugging output */
797 static FILE *tracefile;
800 trace_printf(const char *fmt, ...)
807 fprintf(tracefile, "%u ", (int) time(NULL));
809 fprintf(tracefile, "[%u] ", (int) getpid());
811 fprintf(tracefile, "pending s:%d i:%d(supp:%d) ", pending_sig, pending_int, suppress_int);
813 vfprintf(tracefile, fmt, va);
818 trace_vprintf(const char *fmt, va_list va)
823 fprintf(tracefile, "%u ", (int) time(NULL));
825 fprintf(tracefile, "[%u] ", (int) getpid());
827 fprintf(tracefile, "pending s:%d i:%d(supp:%d) ", pending_sig, pending_int, suppress_int);
828 vfprintf(tracefile, fmt, va);
832 trace_puts(const char *s)
840 trace_puts_quoted(char *s)
847 putc('"', tracefile);
848 for (p = s; *p; p++) {
849 switch ((unsigned char)*p) {
850 case '\n': c = 'n'; goto backslash;
851 case '\t': c = 't'; goto backslash;
852 case '\r': c = 'r'; goto backslash;
853 case '\"': c = '\"'; goto backslash;
854 case '\\': c = '\\'; goto backslash;
855 case CTLESC: c = 'e'; goto backslash;
856 case CTLVAR: c = 'v'; goto backslash;
857 case CTLVAR+CTLQUOTE: c = 'V'; goto backslash;
858 case CTLBACKQ: c = 'q'; goto backslash;
859 case CTLBACKQ+CTLQUOTE: c = 'Q'; goto backslash;
861 putc('\\', tracefile);
865 if (*p >= ' ' && *p <= '~')
868 putc('\\', tracefile);
869 putc((*p >> 6) & 03, tracefile);
870 putc((*p >> 3) & 07, tracefile);
871 putc(*p & 07, tracefile);
876 putc('"', tracefile);
880 trace_puts_args(char **ap)
887 trace_puts_quoted(*ap);
889 putc('\n', tracefile);
892 putc(' ', tracefile);
907 /* leave open because libedit might be using it */
910 strcpy(s, "./trace");
912 if (!freopen(s, "a", tracefile)) {
913 fprintf(stderr, "Can't re-open %s\n", s);
918 tracefile = fopen(s, "a");
919 if (tracefile == NULL) {
920 fprintf(stderr, "Can't open %s\n", s);
926 flags = fcntl(fileno(tracefile), F_GETFL);
928 fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND);
930 setlinebuf(tracefile);
931 fputs("\nTracing started.\n", tracefile);
935 indent(int amount, char *pfx, FILE *fp)
939 for (i = 0; i < amount; i++) {
940 if (pfx && i == amount - 1)
946 /* little circular references here... */
947 static void shtree(union node *n, int ind, char *pfx, FILE *fp);
950 sharg(union node *arg, FILE *fp)
953 struct nodelist *bqlist;
954 unsigned char subtype;
956 if (arg->type != NARG) {
957 out1fmt("<node type %d>\n", arg->type);
960 bqlist = arg->narg.backquote;
961 for (p = arg->narg.text; *p; p++) {
962 switch ((unsigned char)*p) {
971 if (subtype == VSLENGTH)
982 switch (subtype & VSTYPE) {
1008 case VSTRIMRIGHTMAX:
1015 out1fmt("<subtype %d>", subtype);
1022 case CTLBACKQ|CTLQUOTE:
1025 shtree(bqlist->n, -1, NULL, fp);
1036 shcmd(union node *cmd, FILE *fp)
1044 for (np = cmd->ncmd.args; np; np = np->narg.next) {
1050 for (np = cmd->ncmd.redirect; np; np = np->nfile.next) {
1054 switch (np->nfile.type) {
1055 case NTO: s = ">>"+1; dftfd = 1; break;
1056 case NCLOBBER: s = ">|"; dftfd = 1; break;
1057 case NAPPEND: s = ">>"; dftfd = 1; break;
1058 #if ENABLE_ASH_BASH_COMPAT
1061 case NTOFD: s = ">&"; dftfd = 1; break;
1062 case NFROM: s = "<"; break;
1063 case NFROMFD: s = "<&"; break;
1064 case NFROMTO: s = "<>"; break;
1065 default: s = "*error*"; break;
1067 if (np->nfile.fd != dftfd)
1068 fprintf(fp, "%d", np->nfile.fd);
1070 if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) {
1071 fprintf(fp, "%d", np->ndup.dupfd);
1073 sharg(np->nfile.fname, fp);
1080 shtree(union node *n, int ind, char *pfx, FILE *fp)
1082 struct nodelist *lp;
1088 indent(ind, pfx, fp);
1090 if (n == NODE_EOF) {
1105 shtree(n->nbinary.ch1, ind, NULL, fp);
1108 shtree(n->nbinary.ch2, ind, NULL, fp);
1116 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
1117 shtree(lp->n, 0, NULL, fp);
1121 if (n->npipe.pipe_backgnd)
1127 fprintf(fp, "<node type %d>", n->type);
1135 showtree(union node *n)
1137 trace_puts("showtree called\n");
1138 shtree(n, 1, NULL, stderr);
1144 /* ============ Parser data */
1147 * ash_vmsg() needs parsefile->fd, hence parsefile definition is moved up.
1150 struct strlist *next;
1157 struct strpush *prev; /* preceding string on stack */
1159 int prev_left_in_line;
1160 #if ENABLE_ASH_ALIAS
1161 struct alias *ap; /* if push was associated with an alias */
1163 char *string; /* remember the string since it may change */
1167 struct parsefile *prev; /* preceding file on stack */
1168 int linno; /* current line */
1169 int pf_fd; /* file descriptor (or -1 if string) */
1170 int left_in_line; /* number of chars left in this line */
1171 int left_in_buffer; /* number of chars left in this buffer past the line */
1172 char *next_to_pgetc; /* next char in buffer */
1173 char *buf; /* input buffer */
1174 struct strpush *strpush; /* for pushing strings at this level */
1175 struct strpush basestrpush; /* so pushing one is fast */
1178 static struct parsefile basepf; /* top level input file */
1179 static struct parsefile *g_parsefile = &basepf; /* current input file */
1180 static int startlinno; /* line # where last token started */
1181 static char *commandname; /* currently executing command */
1182 static struct strlist *cmdenviron; /* environment for builtin command */
1183 static uint8_t exitstatus; /* exit status of last command */
1186 /* ============ Message printing */
1189 ash_vmsg(const char *msg, va_list ap)
1191 fprintf(stderr, "%s: ", arg0);
1193 if (strcmp(arg0, commandname))
1194 fprintf(stderr, "%s: ", commandname);
1195 if (!iflag || g_parsefile->pf_fd > 0)
1196 fprintf(stderr, "line %d: ", startlinno);
1198 vfprintf(stderr, msg, ap);
1199 outcslow('\n', stderr);
1203 * Exverror is called to raise the error exception. If the second argument
1204 * is not NULL then error prints an error message using printf style
1205 * formatting. It then raises the error exception.
1207 static void ash_vmsg_and_raise(int, const char *, va_list) NORETURN;
1209 ash_vmsg_and_raise(int cond, const char *msg, va_list ap)
1213 TRACE(("ash_vmsg_and_raise(%d, \"", cond));
1215 TRACE(("\") pid=%d\n", getpid()));
1217 TRACE(("ash_vmsg_and_raise(%d, NULL) pid=%d\n", cond, getpid()));
1222 flush_stdout_stderr();
1223 raise_exception(cond);
1227 static void ash_msg_and_raise_error(const char *, ...) NORETURN;
1229 ash_msg_and_raise_error(const char *msg, ...)
1234 ash_vmsg_and_raise(EXERROR, msg, ap);
1239 static void raise_error_syntax(const char *) NORETURN;
1241 raise_error_syntax(const char *msg)
1243 ash_msg_and_raise_error("syntax error: %s", msg);
1247 static void ash_msg_and_raise(int, const char *, ...) NORETURN;
1249 ash_msg_and_raise(int cond, const char *msg, ...)
1254 ash_vmsg_and_raise(cond, msg, ap);
1260 * error/warning routines for external builtins
1263 ash_msg(const char *fmt, ...)
1273 * Return a string describing an error. The returned string may be a
1274 * pointer to a static buffer that will be overwritten on the next call.
1275 * Action describes the operation that got the error.
1278 errmsg(int e, const char *em)
1280 if (e == ENOENT || e == ENOTDIR) {
1287 /* ============ Memory allocation */
1290 /* I consider these wrappers nearly useless:
1291 * ok, they return you to nearest exception handler, but
1292 * how much memory do you leak in the process, making
1293 * memory starvation worse?
1296 ckrealloc(void * p, size_t nbytes)
1298 p = realloc(p, nbytes);
1300 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1305 ckmalloc(size_t nbytes)
1307 return ckrealloc(NULL, nbytes);
1311 ckzalloc(size_t nbytes)
1313 return memset(ckmalloc(nbytes), 0, nbytes);
1317 ckstrdup(const char *s)
1319 char *p = strdup(s);
1321 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1325 /* Using bbox equivalents. They exit if out of memory */
1326 # define ckrealloc xrealloc
1327 # define ckmalloc xmalloc
1328 # define ckzalloc xzalloc
1329 # define ckstrdup xstrdup
1333 * It appears that grabstackstr() will barf with such alignments
1334 * because stalloc() will return a string allocated in a new stackblock.
1336 #define SHELL_ALIGN(nbytes) (((nbytes) + SHELL_SIZE) & ~SHELL_SIZE)
1338 /* Most machines require the value returned from malloc to be aligned
1339 * in some way. The following macro will get this right
1340 * on many machines. */
1341 SHELL_SIZE = sizeof(union { int i; char *cp; double d; }) - 1,
1342 /* Minimum size of a block */
1343 MINSIZE = SHELL_ALIGN(504),
1346 struct stack_block {
1347 struct stack_block *prev;
1348 char space[MINSIZE];
1352 struct stack_block *stackp;
1355 struct stackmark *marknext;
1359 struct globals_memstack {
1360 struct stack_block *g_stackp; // = &stackbase;
1361 struct stackmark *markp;
1362 char *g_stacknxt; // = stackbase.space;
1363 char *sstrend; // = stackbase.space + MINSIZE;
1364 size_t g_stacknleft; // = MINSIZE;
1365 int herefd; // = -1;
1366 struct stack_block stackbase;
1368 extern struct globals_memstack *const ash_ptr_to_globals_memstack;
1369 #define G_memstack (*ash_ptr_to_globals_memstack)
1370 #define g_stackp (G_memstack.g_stackp )
1371 #define markp (G_memstack.markp )
1372 #define g_stacknxt (G_memstack.g_stacknxt )
1373 #define sstrend (G_memstack.sstrend )
1374 #define g_stacknleft (G_memstack.g_stacknleft)
1375 #define herefd (G_memstack.herefd )
1376 #define stackbase (G_memstack.stackbase )
1377 #define INIT_G_memstack() do { \
1378 (*(struct globals_memstack**)&ash_ptr_to_globals_memstack) = xzalloc(sizeof(G_memstack)); \
1380 g_stackp = &stackbase; \
1381 g_stacknxt = stackbase.space; \
1382 g_stacknleft = MINSIZE; \
1383 sstrend = stackbase.space + MINSIZE; \
1388 #define stackblock() ((void *)g_stacknxt)
1389 #define stackblocksize() g_stacknleft
1392 * Parse trees for commands are allocated in lifo order, so we use a stack
1393 * to make this more efficient, and also to avoid all sorts of exception
1394 * handling code to handle interrupts in the middle of a parse.
1396 * The size 504 was chosen because the Ultrix malloc handles that size
1400 stalloc(size_t nbytes)
1405 aligned = SHELL_ALIGN(nbytes);
1406 if (aligned > g_stacknleft) {
1409 struct stack_block *sp;
1411 blocksize = aligned;
1412 if (blocksize < MINSIZE)
1413 blocksize = MINSIZE;
1414 len = sizeof(struct stack_block) - MINSIZE + blocksize;
1415 if (len < blocksize)
1416 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1419 sp->prev = g_stackp;
1420 g_stacknxt = sp->space;
1421 g_stacknleft = blocksize;
1422 sstrend = g_stacknxt + blocksize;
1427 g_stacknxt += aligned;
1428 g_stacknleft -= aligned;
1433 stzalloc(size_t nbytes)
1435 return memset(stalloc(nbytes), 0, nbytes);
1442 if (!p || (g_stacknxt < (char *)p) || ((char *)p < g_stackp->space)) {
1443 write(STDERR_FILENO, "stunalloc\n", 10);
1447 g_stacknleft += g_stacknxt - (char *)p;
1452 * Like strdup but works with the ash stack.
1455 ststrdup(const char *p)
1457 size_t len = strlen(p) + 1;
1458 return memcpy(stalloc(len), p, len);
1462 setstackmark(struct stackmark *mark)
1464 mark->stackp = g_stackp;
1465 mark->stacknxt = g_stacknxt;
1466 mark->stacknleft = g_stacknleft;
1467 mark->marknext = markp;
1472 popstackmark(struct stackmark *mark)
1474 struct stack_block *sp;
1480 markp = mark->marknext;
1481 while (g_stackp != mark->stackp) {
1483 g_stackp = sp->prev;
1486 g_stacknxt = mark->stacknxt;
1487 g_stacknleft = mark->stacknleft;
1488 sstrend = mark->stacknxt + mark->stacknleft;
1493 * When the parser reads in a string, it wants to stick the string on the
1494 * stack and only adjust the stack pointer when it knows how big the
1495 * string is. Stackblock (defined in stack.h) returns a pointer to a block
1496 * of space on top of the stack and stackblocklen returns the length of
1497 * this block. Growstackblock will grow this space by at least one byte,
1498 * possibly moving it (like realloc). Grabstackblock actually allocates the
1499 * part of the block that has been used.
1502 growstackblock(void)
1506 newlen = g_stacknleft * 2;
1507 if (newlen < g_stacknleft)
1508 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1512 if (g_stacknxt == g_stackp->space && g_stackp != &stackbase) {
1513 struct stack_block *oldstackp;
1514 struct stackmark *xmark;
1515 struct stack_block *sp;
1516 struct stack_block *prevstackp;
1520 oldstackp = g_stackp;
1522 prevstackp = sp->prev;
1523 grosslen = newlen + sizeof(struct stack_block) - MINSIZE;
1524 sp = ckrealloc(sp, grosslen);
1525 sp->prev = prevstackp;
1527 g_stacknxt = sp->space;
1528 g_stacknleft = newlen;
1529 sstrend = sp->space + newlen;
1532 * Stack marks pointing to the start of the old block
1533 * must be relocated to point to the new block
1536 while (xmark != NULL && xmark->stackp == oldstackp) {
1537 xmark->stackp = g_stackp;
1538 xmark->stacknxt = g_stacknxt;
1539 xmark->stacknleft = g_stacknleft;
1540 xmark = xmark->marknext;
1544 char *oldspace = g_stacknxt;
1545 size_t oldlen = g_stacknleft;
1546 char *p = stalloc(newlen);
1548 /* free the space we just allocated */
1549 g_stacknxt = memcpy(p, oldspace, oldlen);
1550 g_stacknleft += newlen;
1555 grabstackblock(size_t len)
1557 len = SHELL_ALIGN(len);
1559 g_stacknleft -= len;
1563 * The following routines are somewhat easier to use than the above.
1564 * The user declares a variable of type STACKSTR, which may be declared
1565 * to be a register. The macro STARTSTACKSTR initializes things. Then
1566 * the user uses the macro STPUTC to add characters to the string. In
1567 * effect, STPUTC(c, p) is the same as *p++ = c except that the stack is
1568 * grown as necessary. When the user is done, she can just leave the
1569 * string there and refer to it using stackblock(). Or she can allocate
1570 * the space for it using grabstackstr(). If it is necessary to allow
1571 * someone else to use the stack temporarily and then continue to grow
1572 * the string, the user should use grabstack to allocate the space, and
1573 * then call ungrabstr(p) to return to the previous mode of operation.
1575 * USTPUTC is like STPUTC except that it doesn't check for overflow.
1576 * CHECKSTACKSPACE can be called before USTPUTC to ensure that there
1577 * is space for at least one character.
1582 size_t len = stackblocksize();
1583 if (herefd >= 0 && len >= 1024) {
1584 full_write(herefd, stackblock(), len);
1585 return stackblock();
1588 return (char *)stackblock() + len;
1592 * Called from CHECKSTRSPACE.
1595 makestrspace(size_t newlen, char *p)
1597 size_t len = p - g_stacknxt;
1598 size_t size = stackblocksize();
1603 size = stackblocksize();
1605 if (nleft >= newlen)
1609 return (char *)stackblock() + len;
1613 stack_nputstr(const char *s, size_t n, char *p)
1615 p = makestrspace(n, p);
1616 p = (char *)memcpy(p, s, n) + n;
1621 stack_putstr(const char *s, char *p)
1623 return stack_nputstr(s, strlen(s), p);
1627 _STPUTC(int c, char *p)
1635 #define STARTSTACKSTR(p) ((p) = stackblock())
1636 #define STPUTC(c, p) ((p) = _STPUTC((c), (p)))
1637 #define CHECKSTRSPACE(n, p) do { \
1640 size_t m = sstrend - q; \
1642 (p) = makestrspace(l, q); \
1644 #define USTPUTC(c, p) (*(p)++ = (c))
1645 #define STACKSTRNUL(p) do { \
1646 if ((p) == sstrend) \
1647 (p) = growstackstr(); \
1650 #define STUNPUTC(p) (--(p))
1651 #define STTOPC(p) ((p)[-1])
1652 #define STADJUST(amount, p) ((p) += (amount))
1654 #define grabstackstr(p) stalloc((char *)(p) - (char *)stackblock())
1655 #define ungrabstackstr(s, p) stunalloc(s)
1656 #define stackstrend() ((void *)sstrend)
1659 /* ============ String helpers */
1662 * prefix -- see if pfx is a prefix of string.
1665 prefix(const char *string, const char *pfx)
1668 if (*pfx++ != *string++)
1671 return (char *) string;
1675 * Check for a valid number. This should be elsewhere.
1678 is_number(const char *p)
1683 } while (*++p != '\0');
1688 * Convert a string of digits to an integer, printing an error message on
1692 number(const char *s)
1695 ash_msg_and_raise_error(msg_illnum, s);
1700 * Produce a possibly single quoted string suitable as input to the shell.
1701 * The return string is allocated on the stack.
1704 single_quote(const char *s)
1714 len = strchrnul(s, '\'') - s;
1716 q = p = makestrspace(len + 3, p);
1719 q = (char *)memcpy(q, s, len) + len;
1728 do len++; while (*++s == '\'');
1730 q = p = makestrspace(len + 3, p);
1733 q = (char *)memcpy(q, s - len, len) + len;
1741 return stackblock();
1745 /* ============ nextopt */
1747 static char **argptr; /* argument list for builtin commands */
1748 static char *optionarg; /* set by nextopt (like getopt) */
1749 static char *optptr; /* used by nextopt */
1752 * XXX - should get rid of. Have all builtins use getopt(3).
1753 * The library getopt must have the BSD extension static variable
1754 * "optreset", otherwise it can't be used within the shell safely.
1756 * Standard option processing (a la getopt) for builtin routines.
1757 * The only argument that is passed to nextopt is the option string;
1758 * the other arguments are unnecessary. It returns the character,
1759 * or '\0' on end of input.
1762 nextopt(const char *optstring)
1769 if (p == NULL || *p == '\0') {
1770 /* We ate entire "-param", take next one */
1776 if (*++p == '\0') /* just "-" ? */
1779 if (LONE_DASH(p)) /* "--" ? */
1781 /* p => next "-param" */
1783 /* p => some option char in the middle of a "-param" */
1785 for (q = optstring; *q != c;) {
1787 ash_msg_and_raise_error("illegal option -%c", c);
1795 ash_msg_and_raise_error("no arg for -%c option", c);
1805 /* ============ Shell variables */
1808 * The parsefile structure pointed to by the global variable parsefile
1809 * contains information about the current file being read.
1812 int nparam; /* # of positional parameters (without $0) */
1813 #if ENABLE_ASH_GETOPTS
1814 int optind; /* next parameter to be processed by getopts */
1815 int optoff; /* used by getopts */
1817 unsigned char malloced; /* if parameter list dynamically allocated */
1818 char **p; /* parameter list */
1822 * Free the list of positional parameters.
1825 freeparam(volatile struct shparam *param)
1827 if (param->malloced) {
1829 ap = ap1 = param->p;
1836 #if ENABLE_ASH_GETOPTS
1837 static void FAST_FUNC getoptsreset(const char *value);
1841 struct var *next; /* next entry in hash list */
1842 int flags; /* flags are defined above */
1843 const char *var_text; /* name=value */
1844 void (*var_func)(const char *) FAST_FUNC; /* function to be called when */
1845 /* the variable gets set/unset */
1849 struct localvar *next; /* next local variable in list */
1850 struct var *vp; /* the variable that was made local */
1851 int flags; /* saved flags */
1852 const char *text; /* saved text */
1856 #define VEXPORT 0x01 /* variable is exported */
1857 #define VREADONLY 0x02 /* variable cannot be modified */
1858 #define VSTRFIXED 0x04 /* variable struct is statically allocated */
1859 #define VTEXTFIXED 0x08 /* text is statically allocated */
1860 #define VSTACK 0x10 /* text is allocated on the stack */
1861 #define VUNSET 0x20 /* the variable is not set */
1862 #define VNOFUNC 0x40 /* don't call the callback function */
1863 #define VNOSET 0x80 /* do not set variable - just readonly test */
1864 #define VNOSAVE 0x100 /* when text is on the heap before setvareq */
1865 #if ENABLE_ASH_RANDOM_SUPPORT
1866 # define VDYNAMIC 0x200 /* dynamic variable */
1872 /* Need to be before varinit_data[] */
1873 #if ENABLE_LOCALE_SUPPORT
1874 static void FAST_FUNC
1875 change_lc_all(const char *value)
1877 if (value && *value != '\0')
1878 setlocale(LC_ALL, value);
1880 static void FAST_FUNC
1881 change_lc_ctype(const char *value)
1883 if (value && *value != '\0')
1884 setlocale(LC_CTYPE, value);
1888 static void chkmail(void);
1889 static void changemail(const char *var_value) FAST_FUNC;
1891 # define chkmail() ((void)0)
1893 static void changepath(const char *) FAST_FUNC;
1894 #if ENABLE_ASH_RANDOM_SUPPORT
1895 static void change_random(const char *) FAST_FUNC;
1898 static const struct {
1900 const char *var_text;
1901 void (*var_func)(const char *) FAST_FUNC;
1902 } varinit_data[] = {
1903 { VSTRFIXED|VTEXTFIXED , defifsvar , NULL },
1905 { VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL" , changemail },
1906 { VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH" , changemail },
1908 { VSTRFIXED|VTEXTFIXED , bb_PATH_root_path, changepath },
1909 { VSTRFIXED|VTEXTFIXED , "PS1=$ " , NULL },
1910 { VSTRFIXED|VTEXTFIXED , "PS2=> " , NULL },
1911 { VSTRFIXED|VTEXTFIXED , "PS4=+ " , NULL },
1912 #if ENABLE_ASH_GETOPTS
1913 { VSTRFIXED|VTEXTFIXED , "OPTIND=1" , getoptsreset },
1915 #if ENABLE_ASH_RANDOM_SUPPORT
1916 { VSTRFIXED|VTEXTFIXED|VUNSET|VDYNAMIC, "RANDOM", change_random },
1918 #if ENABLE_LOCALE_SUPPORT
1919 { VSTRFIXED|VTEXTFIXED|VUNSET, "LC_ALL" , change_lc_all },
1920 { VSTRFIXED|VTEXTFIXED|VUNSET, "LC_CTYPE" , change_lc_ctype },
1922 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
1923 { VSTRFIXED|VTEXTFIXED|VUNSET, "HISTFILE" , NULL },
1929 struct globals_var {
1930 struct shparam shellparam; /* $@ current positional parameters */
1931 struct redirtab *redirlist;
1933 int preverrout_fd; /* save fd2 before print debug if xflag is set. */
1934 struct var *vartab[VTABSIZE];
1935 struct var varinit[ARRAY_SIZE(varinit_data)];
1937 extern struct globals_var *const ash_ptr_to_globals_var;
1938 #define G_var (*ash_ptr_to_globals_var)
1939 #define shellparam (G_var.shellparam )
1940 //#define redirlist (G_var.redirlist )
1941 #define g_nullredirs (G_var.g_nullredirs )
1942 #define preverrout_fd (G_var.preverrout_fd)
1943 #define vartab (G_var.vartab )
1944 #define varinit (G_var.varinit )
1945 #define INIT_G_var() do { \
1947 (*(struct globals_var**)&ash_ptr_to_globals_var) = xzalloc(sizeof(G_var)); \
1949 for (i = 0; i < ARRAY_SIZE(varinit_data); i++) { \
1950 varinit[i].flags = varinit_data[i].flags; \
1951 varinit[i].var_text = varinit_data[i].var_text; \
1952 varinit[i].var_func = varinit_data[i].var_func; \
1956 #define vifs varinit[0]
1958 # define vmail (&vifs)[1]
1959 # define vmpath (&vmail)[1]
1960 # define vpath (&vmpath)[1]
1962 # define vpath (&vifs)[1]
1964 #define vps1 (&vpath)[1]
1965 #define vps2 (&vps1)[1]
1966 #define vps4 (&vps2)[1]
1967 #if ENABLE_ASH_GETOPTS
1968 # define voptind (&vps4)[1]
1969 # if ENABLE_ASH_RANDOM_SUPPORT
1970 # define vrandom (&voptind)[1]
1973 # if ENABLE_ASH_RANDOM_SUPPORT
1974 # define vrandom (&vps4)[1]
1979 * The following macros access the values of the above variables.
1980 * They have to skip over the name. They return the null string
1981 * for unset variables.
1983 #define ifsval() (vifs.var_text + 4)
1984 #define ifsset() ((vifs.flags & VUNSET) == 0)
1986 # define mailval() (vmail.var_text + 5)
1987 # define mpathval() (vmpath.var_text + 9)
1988 # define mpathset() ((vmpath.flags & VUNSET) == 0)
1990 #define pathval() (vpath.var_text + 5)
1991 #define ps1val() (vps1.var_text + 4)
1992 #define ps2val() (vps2.var_text + 4)
1993 #define ps4val() (vps4.var_text + 4)
1994 #if ENABLE_ASH_GETOPTS
1995 # define optindval() (voptind.var_text + 7)
1998 #if ENABLE_ASH_GETOPTS
1999 static void FAST_FUNC
2000 getoptsreset(const char *value)
2002 shellparam.optind = number(value);
2003 shellparam.optoff = -1;
2007 /* math.h has these, otherwise define our private copies */
2008 #if !ENABLE_SH_MATH_SUPPORT
2009 #define is_name(c) ((c) == '_' || isalpha((unsigned char)(c)))
2010 #define is_in_name(c) ((c) == '_' || isalnum((unsigned char)(c)))
2012 * Return the pointer to the first char which is not part of a legal variable name
2013 * (a letter or underscore followed by letters, underscores, and digits).
2016 endofname(const char *name)
2018 if (!is_name(*name))
2021 if (!is_in_name(*name))
2029 * Compares two strings up to the first = or '\0'. The first
2030 * string must be terminated by '='; the second may be terminated by
2031 * either '=' or '\0'.
2034 varcmp(const char *p, const char *q)
2038 while ((c = *p) == (d = *q)) {
2053 * Find the appropriate entry in the hash table from the name.
2055 static struct var **
2056 hashvar(const char *p)
2060 hashval = ((unsigned char) *p) << 4;
2061 while (*p && *p != '=')
2062 hashval += (unsigned char) *p++;
2063 return &vartab[hashval % VTABSIZE];
2067 vpcmp(const void *a, const void *b)
2069 return varcmp(*(const char **)a, *(const char **)b);
2073 * This routine initializes the builtin variables.
2083 * PS1 depends on uid
2085 #if ENABLE_FEATURE_EDITING && ENABLE_FEATURE_EDITING_FANCY_PROMPT
2086 vps1.var_text = "PS1=\\w \\$ ";
2089 vps1.var_text = "PS1=# ";
2092 end = vp + ARRAY_SIZE(varinit);
2094 vpp = hashvar(vp->var_text);
2097 } while (++vp < end);
2100 static struct var **
2101 findvar(struct var **vpp, const char *name)
2103 for (; *vpp; vpp = &(*vpp)->next) {
2104 if (varcmp((*vpp)->var_text, name) == 0) {
2112 * Find the value of a variable. Returns NULL if not set.
2114 static const char* FAST_FUNC
2115 lookupvar(const char *name)
2119 v = *findvar(hashvar(name), name);
2121 #if ENABLE_ASH_RANDOM_SUPPORT
2123 * Dynamic variables are implemented roughly the same way they are
2124 * in bash. Namely, they're "special" so long as they aren't unset.
2125 * As soon as they're unset, they're no longer dynamic, and dynamic
2126 * lookup will no longer happen at that point. -- PFM.
2128 if (v->flags & VDYNAMIC)
2131 if (!(v->flags & VUNSET))
2132 return var_end(v->var_text);
2138 * Search the environment of a builtin command.
2141 bltinlookup(const char *name)
2145 for (sp = cmdenviron; sp; sp = sp->next) {
2146 if (varcmp(sp->text, name) == 0)
2147 return var_end(sp->text);
2149 return lookupvar(name);
2153 * Same as setvar except that the variable and value are passed in
2154 * the first argument as name=value. Since the first argument will
2155 * be actually stored in the table, it should not be a string that
2157 * Called with interrupts off.
2160 setvareq(char *s, int flags)
2162 struct var *vp, **vpp;
2165 flags |= (VEXPORT & (((unsigned) (1 - aflag)) - 1));
2166 vp = *findvar(vpp, s);
2168 if ((vp->flags & (VREADONLY|VDYNAMIC)) == VREADONLY) {
2171 if (flags & VNOSAVE)
2174 ash_msg_and_raise_error("%.*s: is read only", strchrnul(n, '=') - n, n);
2180 if (vp->var_func && !(flags & VNOFUNC))
2181 vp->var_func(var_end(s));
2183 if (!(vp->flags & (VTEXTFIXED|VSTACK)))
2184 free((char*)vp->var_text);
2186 flags |= vp->flags & ~(VTEXTFIXED|VSTACK|VNOSAVE|VUNSET);
2188 /* variable s is not found */
2191 vp = ckzalloc(sizeof(*vp));
2193 /*vp->func = NULL; - ckzalloc did it */
2196 if (!(flags & (VTEXTFIXED|VSTACK|VNOSAVE)))
2203 * Set the value of a variable. The flags argument is ored with the
2204 * flags of the variable. If val is NULL, the variable is unset.
2207 setvar(const char *name, const char *val, int flags)
2215 q = endofname(name);
2216 p = strchrnul(q, '=');
2218 if (!namelen || p != q)
2219 ash_msg_and_raise_error("%.*s: bad variable name", namelen, name);
2224 vallen = strlen(val);
2228 nameeq = ckmalloc(namelen + vallen + 2);
2229 p = memcpy(nameeq, name, namelen) + namelen;
2232 p = memcpy(p, val, vallen) + vallen;
2235 setvareq(nameeq, flags | VNOSAVE);
2239 static void FAST_FUNC
2240 setvar2(const char *name, const char *val)
2242 setvar(name, val, 0);
2245 #if ENABLE_ASH_GETOPTS
2247 * Safe version of setvar, returns 1 on success 0 on failure.
2250 setvarsafe(const char *name, const char *val, int flags)
2253 volatile int saveint;
2254 struct jmploc *volatile savehandler = exception_handler;
2255 struct jmploc jmploc;
2258 if (setjmp(jmploc.loc))
2261 exception_handler = &jmploc;
2262 setvar(name, val, flags);
2265 exception_handler = savehandler;
2266 RESTORE_INT(saveint);
2272 * Unset the specified variable.
2275 unsetvar(const char *s)
2281 vpp = findvar(hashvar(s), s);
2285 int flags = vp->flags;
2288 if (flags & VREADONLY)
2290 #if ENABLE_ASH_RANDOM_SUPPORT
2291 vp->flags &= ~VDYNAMIC;
2295 if ((flags & VSTRFIXED) == 0) {
2297 if ((flags & (VTEXTFIXED|VSTACK)) == 0)
2298 free((char*)vp->var_text);
2304 vp->flags &= ~VEXPORT;
2314 * Process a linked list of variable assignments.
2317 listsetvar(struct strlist *list_set_var, int flags)
2319 struct strlist *lp = list_set_var;
2325 setvareq(lp->text, flags);
2332 * Generate a list of variables satisfying the given conditions.
2335 listvars(int on, int off, char ***end)
2346 for (vp = *vpp; vp; vp = vp->next) {
2347 if ((vp->flags & mask) == on) {
2348 if (ep == stackstrend())
2349 ep = growstackstr();
2350 *ep++ = (char*)vp->var_text;
2353 } while (++vpp < vartab + VTABSIZE);
2354 if (ep == stackstrend())
2355 ep = growstackstr();
2359 return grabstackstr(ep);
2363 /* ============ Path search helper
2365 * The variable path (passed by reference) should be set to the start
2366 * of the path before the first call; path_advance will update
2367 * this value as it proceeds. Successive calls to path_advance will return
2368 * the possible path expansions in sequence. If an option (indicated by
2369 * a percent sign) appears in the path entry then the global variable
2370 * pathopt will be set to point to it; otherwise pathopt will be set to
2373 static const char *pathopt; /* set by path_advance */
2376 path_advance(const char **path, const char *name)
2386 for (p = start; *p && *p != ':' && *p != '%'; p++)
2388 len = p - start + strlen(name) + 2; /* "2" is for '/' and '\0' */
2389 while (stackblocksize() < len)
2393 memcpy(q, start, p - start);
2401 while (*p && *p != ':')
2408 return stalloc(len);
2412 /* ============ Prompt */
2414 static smallint doprompt; /* if set, prompt the user */
2415 static smallint needprompt; /* true if interactive and at start of line */
2417 #if ENABLE_FEATURE_EDITING
2418 static line_input_t *line_input_state;
2419 static const char *cmdedit_prompt;
2421 putprompt(const char *s)
2423 if (ENABLE_ASH_EXPAND_PRMT) {
2424 free((char*)cmdedit_prompt);
2425 cmdedit_prompt = ckstrdup(s);
2432 putprompt(const char *s)
2438 #if ENABLE_ASH_EXPAND_PRMT
2439 /* expandstr() needs parsing machinery, so it is far away ahead... */
2440 static const char *expandstr(const char *ps);
2442 #define expandstr(s) s
2446 setprompt_if(smallint do_set, int whichprompt)
2449 IF_ASH_EXPAND_PRMT(struct stackmark smark;)
2456 switch (whichprompt) {
2466 #if ENABLE_ASH_EXPAND_PRMT
2467 setstackmark(&smark);
2468 stalloc(stackblocksize());
2470 putprompt(expandstr(prompt));
2471 #if ENABLE_ASH_EXPAND_PRMT
2472 popstackmark(&smark);
2477 /* ============ The cd and pwd commands */
2479 #define CD_PHYSICAL 1
2489 while ((i = nextopt("LP")) != '\0') {
2491 flags ^= CD_PHYSICAL;
2500 * Update curdir (the name of the current directory) in response to a
2504 updatepwd(const char *dir)
2511 cdcomppath = ststrdup(dir);
2514 if (curdir == nullstr)
2516 new = stack_putstr(curdir, new);
2518 new = makestrspace(strlen(dir) + 2, new);
2519 lim = (char *)stackblock() + 1;
2523 if (new > lim && *lim == '/')
2528 if (dir[1] == '/' && dir[2] != '/') {
2534 p = strtok(cdcomppath, "/");
2538 if (p[1] == '.' && p[2] == '\0') {
2550 new = stack_putstr(p, new);
2558 return stackblock();
2562 * Find out what the current directory is. If we already know the current
2563 * directory, this routine returns immediately.
2568 char *dir = getcwd(NULL, 0); /* huh, using glibc extension? */
2569 return dir ? dir : nullstr;
2573 setpwd(const char *val, int setold)
2577 oldcur = dir = curdir;
2580 setvar("OLDPWD", oldcur, VEXPORT);
2583 if (physdir != nullstr) {
2584 if (physdir != oldcur)
2588 if (oldcur == val || !val) {
2594 dir = ckstrdup(val);
2595 if (oldcur != dir && oldcur != nullstr) {
2600 setvar("PWD", dir, VEXPORT);
2603 static void hashcd(void);
2606 * Actually do the chdir. We also call hashcd to let the routines in exec.c
2607 * know that the current directory has changed.
2610 docd(const char *dest, int flags)
2612 const char *dir = NULL;
2615 TRACE(("docd(\"%s\", %d) called\n", dest, flags));
2618 if (!(flags & CD_PHYSICAL)) {
2619 dir = updatepwd(dest);
2633 static int FAST_FUNC
2634 cdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
2646 dest = bltinlookup("HOME");
2647 else if (LONE_DASH(dest)) {
2648 dest = bltinlookup("OLDPWD");
2670 path = bltinlookup("CDPATH");
2679 p = path_advance(&path, dest);
2680 if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
2684 if (!docd(p, flags))
2689 ash_msg_and_raise_error("can't cd to %s", dest);
2692 if (flags & CD_PRINT)
2693 out1fmt("%s\n", curdir);
2697 static int FAST_FUNC
2698 pwdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
2701 const char *dir = curdir;
2705 if (physdir == nullstr)
2709 out1fmt("%s\n", dir);
2714 /* ============ ... */
2717 #define IBUFSIZ (ENABLE_FEATURE_EDITING ? CONFIG_FEATURE_EDITING_MAX_LEN : 1024)
2719 /* Syntax classes */
2720 #define CWORD 0 /* character is nothing special */
2721 #define CNL 1 /* newline character */
2722 #define CBACK 2 /* a backslash character */
2723 #define CSQUOTE 3 /* single quote */
2724 #define CDQUOTE 4 /* double quote */
2725 #define CENDQUOTE 5 /* a terminating quote */
2726 #define CBQUOTE 6 /* backwards single quote */
2727 #define CVAR 7 /* a dollar sign */
2728 #define CENDVAR 8 /* a '}' character */
2729 #define CLP 9 /* a left paren in arithmetic */
2730 #define CRP 10 /* a right paren in arithmetic */
2731 #define CENDFILE 11 /* end of file */
2732 #define CCTL 12 /* like CWORD, except it must be escaped */
2733 #define CSPCL 13 /* these terminate a word */
2734 #define CIGN 14 /* character should be ignored */
2737 #if ENABLE_ASH_ALIAS
2741 #define USE_SIT_FUNCTION ENABLE_ASH_OPTIMIZE_FOR_SIZE
2743 #if ENABLE_SH_MATH_SUPPORT
2744 # define SIT_ITEM(a,b,c,d) (a | (b << 4) | (c << 8) | (d << 12))
2746 # define SIT_ITEM(a,b,c,d) (a | (b << 4) | (c << 8))
2748 static const uint16_t S_I_T[] = {
2749 #if ENABLE_ASH_ALIAS
2750 SIT_ITEM(CSPCL , CIGN , CIGN , CIGN ), /* 0, PEOA */
2752 SIT_ITEM(CSPCL , CWORD , CWORD, CWORD ), /* 1, ' ' */
2753 SIT_ITEM(CNL , CNL , CNL , CNL ), /* 2, \n */
2754 SIT_ITEM(CWORD , CCTL , CCTL , CWORD ), /* 3, !*-/:=?[]~ */
2755 SIT_ITEM(CDQUOTE , CENDQUOTE, CWORD, CWORD ), /* 4, '"' */
2756 SIT_ITEM(CVAR , CVAR , CWORD, CVAR ), /* 5, $ */
2757 SIT_ITEM(CSQUOTE , CWORD , CENDQUOTE, CWORD), /* 6, "'" */
2758 SIT_ITEM(CSPCL , CWORD , CWORD, CLP ), /* 7, ( */
2759 SIT_ITEM(CSPCL , CWORD , CWORD, CRP ), /* 8, ) */
2760 SIT_ITEM(CBACK , CBACK , CCTL , CBACK ), /* 9, \ */
2761 SIT_ITEM(CBQUOTE , CBQUOTE , CWORD, CBQUOTE), /* 10, ` */
2762 SIT_ITEM(CENDVAR , CENDVAR , CWORD, CENDVAR), /* 11, } */
2763 #if !USE_SIT_FUNCTION
2764 SIT_ITEM(CENDFILE, CENDFILE , CENDFILE, CENDFILE),/* 12, PEOF */
2765 SIT_ITEM(CWORD , CWORD , CWORD, CWORD ), /* 13, 0-9A-Za-z */
2766 SIT_ITEM(CCTL , CCTL , CCTL , CCTL ) /* 14, CTLESC ... */
2770 /* Constants below must match table above */
2772 #if ENABLE_ASH_ALIAS
2773 CSPCL_CIGN_CIGN_CIGN , /* 0 */
2775 CSPCL_CWORD_CWORD_CWORD , /* 1 */
2776 CNL_CNL_CNL_CNL , /* 2 */
2777 CWORD_CCTL_CCTL_CWORD , /* 3 */
2778 CDQUOTE_CENDQUOTE_CWORD_CWORD , /* 4 */
2779 CVAR_CVAR_CWORD_CVAR , /* 5 */
2780 CSQUOTE_CWORD_CENDQUOTE_CWORD , /* 6 */
2781 CSPCL_CWORD_CWORD_CLP , /* 7 */
2782 CSPCL_CWORD_CWORD_CRP , /* 8 */
2783 CBACK_CBACK_CCTL_CBACK , /* 9 */
2784 CBQUOTE_CBQUOTE_CWORD_CBQUOTE , /* 10 */
2785 CENDVAR_CENDVAR_CWORD_CENDVAR , /* 11 */
2786 CENDFILE_CENDFILE_CENDFILE_CENDFILE, /* 12 */
2787 CWORD_CWORD_CWORD_CWORD , /* 13 */
2788 CCTL_CCTL_CCTL_CCTL , /* 14 */
2791 /* c in SIT(c, syntax) must be an *unsigned char* or PEOA or PEOF,
2792 * caller must ensure proper cast on it if c is *char_ptr!
2794 /* Values for syntax param */
2795 #define BASESYNTAX 0 /* not in quotes */
2796 #define DQSYNTAX 1 /* in double quotes */
2797 #define SQSYNTAX 2 /* in single quotes */
2798 #define ARISYNTAX 3 /* in arithmetic */
2799 #define PSSYNTAX 4 /* prompt. never passed to SIT() */
2801 #if USE_SIT_FUNCTION
2804 SIT(int c, int syntax)
2806 static const char spec_symbls[] ALIGN1 = "\t\n !\"$&'()*-/:;<=>?[\\]`|}~";
2807 # if ENABLE_ASH_ALIAS
2808 static const uint8_t syntax_index_table[] ALIGN1 = {
2809 1, 2, 1, 3, 4, 5, 1, 6, /* "\t\n !\"$&'" */
2810 7, 8, 3, 3, 3, 3, 1, 1, /* "()*-/:;<" */
2811 3, 1, 3, 3, 9, 3, 10, 1, /* "=>?[\\]`|" */
2815 static const uint8_t syntax_index_table[] ALIGN1 = {
2816 0, 1, 0, 2, 3, 4, 0, 5, /* "\t\n !\"$&'" */
2817 6, 7, 2, 2, 2, 2, 0, 0, /* "()*-/:;<" */
2818 2, 0, 2, 2, 8, 2, 9, 0, /* "=>?[\\]`|" */
2827 # if ENABLE_ASH_ALIAS
2833 /* Cast is purely for paranoia here,
2834 * just in case someone passed signed char to us */
2835 if ((unsigned char)c >= CTL_FIRST
2836 && (unsigned char)c <= CTL_LAST
2840 s = strchrnul(spec_symbls, c);
2843 indx = syntax_index_table[s - spec_symbls];
2845 return (S_I_T[indx] >> (syntax*4)) & 0xf;
2848 #else /* !USE_SIT_FUNCTION */
2850 static const uint8_t syntax_index_table[] = {
2851 /* BASESYNTAX_DQSYNTAX_SQSYNTAX_ARISYNTAX */
2852 /* 0 */ CWORD_CWORD_CWORD_CWORD,
2853 /* 1 */ CWORD_CWORD_CWORD_CWORD,
2854 /* 2 */ CWORD_CWORD_CWORD_CWORD,
2855 /* 3 */ CWORD_CWORD_CWORD_CWORD,
2856 /* 4 */ CWORD_CWORD_CWORD_CWORD,
2857 /* 5 */ CWORD_CWORD_CWORD_CWORD,
2858 /* 6 */ CWORD_CWORD_CWORD_CWORD,
2859 /* 7 */ CWORD_CWORD_CWORD_CWORD,
2860 /* 8 */ CWORD_CWORD_CWORD_CWORD,
2861 /* 9 "\t" */ CSPCL_CWORD_CWORD_CWORD,
2862 /* 10 "\n" */ CNL_CNL_CNL_CNL,
2863 /* 11 */ CWORD_CWORD_CWORD_CWORD,
2864 /* 12 */ CWORD_CWORD_CWORD_CWORD,
2865 /* 13 */ CWORD_CWORD_CWORD_CWORD,
2866 /* 14 */ CWORD_CWORD_CWORD_CWORD,
2867 /* 15 */ CWORD_CWORD_CWORD_CWORD,
2868 /* 16 */ CWORD_CWORD_CWORD_CWORD,
2869 /* 17 */ CWORD_CWORD_CWORD_CWORD,
2870 /* 18 */ CWORD_CWORD_CWORD_CWORD,
2871 /* 19 */ CWORD_CWORD_CWORD_CWORD,
2872 /* 20 */ CWORD_CWORD_CWORD_CWORD,
2873 /* 21 */ CWORD_CWORD_CWORD_CWORD,
2874 /* 22 */ CWORD_CWORD_CWORD_CWORD,
2875 /* 23 */ CWORD_CWORD_CWORD_CWORD,
2876 /* 24 */ CWORD_CWORD_CWORD_CWORD,
2877 /* 25 */ CWORD_CWORD_CWORD_CWORD,
2878 /* 26 */ CWORD_CWORD_CWORD_CWORD,
2879 /* 27 */ CWORD_CWORD_CWORD_CWORD,
2880 /* 28 */ CWORD_CWORD_CWORD_CWORD,
2881 /* 29 */ CWORD_CWORD_CWORD_CWORD,
2882 /* 30 */ CWORD_CWORD_CWORD_CWORD,
2883 /* 31 */ CWORD_CWORD_CWORD_CWORD,
2884 /* 32 " " */ CSPCL_CWORD_CWORD_CWORD,
2885 /* 33 "!" */ CWORD_CCTL_CCTL_CWORD,
2886 /* 34 """ */ CDQUOTE_CENDQUOTE_CWORD_CWORD,
2887 /* 35 "#" */ CWORD_CWORD_CWORD_CWORD,
2888 /* 36 "$" */ CVAR_CVAR_CWORD_CVAR,
2889 /* 37 "%" */ CWORD_CWORD_CWORD_CWORD,
2890 /* 38 "&" */ CSPCL_CWORD_CWORD_CWORD,
2891 /* 39 "'" */ CSQUOTE_CWORD_CENDQUOTE_CWORD,
2892 /* 40 "(" */ CSPCL_CWORD_CWORD_CLP,
2893 /* 41 ")" */ CSPCL_CWORD_CWORD_CRP,
2894 /* 42 "*" */ CWORD_CCTL_CCTL_CWORD,
2895 /* 43 "+" */ CWORD_CWORD_CWORD_CWORD,
2896 /* 44 "," */ CWORD_CWORD_CWORD_CWORD,
2897 /* 45 "-" */ CWORD_CCTL_CCTL_CWORD,
2898 /* 46 "." */ CWORD_CWORD_CWORD_CWORD,
2899 /* 47 "/" */ CWORD_CCTL_CCTL_CWORD,
2900 /* 48 "0" */ CWORD_CWORD_CWORD_CWORD,
2901 /* 49 "1" */ CWORD_CWORD_CWORD_CWORD,
2902 /* 50 "2" */ CWORD_CWORD_CWORD_CWORD,
2903 /* 51 "3" */ CWORD_CWORD_CWORD_CWORD,
2904 /* 52 "4" */ CWORD_CWORD_CWORD_CWORD,
2905 /* 53 "5" */ CWORD_CWORD_CWORD_CWORD,
2906 /* 54 "6" */ CWORD_CWORD_CWORD_CWORD,
2907 /* 55 "7" */ CWORD_CWORD_CWORD_CWORD,
2908 /* 56 "8" */ CWORD_CWORD_CWORD_CWORD,
2909 /* 57 "9" */ CWORD_CWORD_CWORD_CWORD,
2910 /* 58 ":" */ CWORD_CCTL_CCTL_CWORD,
2911 /* 59 ";" */ CSPCL_CWORD_CWORD_CWORD,
2912 /* 60 "<" */ CSPCL_CWORD_CWORD_CWORD,
2913 /* 61 "=" */ CWORD_CCTL_CCTL_CWORD,
2914 /* 62 ">" */ CSPCL_CWORD_CWORD_CWORD,
2915 /* 63 "?" */ CWORD_CCTL_CCTL_CWORD,
2916 /* 64 "@" */ CWORD_CWORD_CWORD_CWORD,
2917 /* 65 "A" */ CWORD_CWORD_CWORD_CWORD,
2918 /* 66 "B" */ CWORD_CWORD_CWORD_CWORD,
2919 /* 67 "C" */ CWORD_CWORD_CWORD_CWORD,
2920 /* 68 "D" */ CWORD_CWORD_CWORD_CWORD,
2921 /* 69 "E" */ CWORD_CWORD_CWORD_CWORD,
2922 /* 70 "F" */ CWORD_CWORD_CWORD_CWORD,
2923 /* 71 "G" */ CWORD_CWORD_CWORD_CWORD,
2924 /* 72 "H" */ CWORD_CWORD_CWORD_CWORD,
2925 /* 73 "I" */ CWORD_CWORD_CWORD_CWORD,
2926 /* 74 "J" */ CWORD_CWORD_CWORD_CWORD,
2927 /* 75 "K" */ CWORD_CWORD_CWORD_CWORD,
2928 /* 76 "L" */ CWORD_CWORD_CWORD_CWORD,
2929 /* 77 "M" */ CWORD_CWORD_CWORD_CWORD,
2930 /* 78 "N" */ CWORD_CWORD_CWORD_CWORD,
2931 /* 79 "O" */ CWORD_CWORD_CWORD_CWORD,
2932 /* 80 "P" */ CWORD_CWORD_CWORD_CWORD,
2933 /* 81 "Q" */ CWORD_CWORD_CWORD_CWORD,
2934 /* 82 "R" */ CWORD_CWORD_CWORD_CWORD,
2935 /* 83 "S" */ CWORD_CWORD_CWORD_CWORD,
2936 /* 84 "T" */ CWORD_CWORD_CWORD_CWORD,
2937 /* 85 "U" */ CWORD_CWORD_CWORD_CWORD,
2938 /* 86 "V" */ CWORD_CWORD_CWORD_CWORD,
2939 /* 87 "W" */ CWORD_CWORD_CWORD_CWORD,
2940 /* 88 "X" */ CWORD_CWORD_CWORD_CWORD,
2941 /* 89 "Y" */ CWORD_CWORD_CWORD_CWORD,
2942 /* 90 "Z" */ CWORD_CWORD_CWORD_CWORD,
2943 /* 91 "[" */ CWORD_CCTL_CCTL_CWORD,
2944 /* 92 "\" */ CBACK_CBACK_CCTL_CBACK,
2945 /* 93 "]" */ CWORD_CCTL_CCTL_CWORD,
2946 /* 94 "^" */ CWORD_CWORD_CWORD_CWORD,
2947 /* 95 "_" */ CWORD_CWORD_CWORD_CWORD,
2948 /* 96 "`" */ CBQUOTE_CBQUOTE_CWORD_CBQUOTE,
2949 /* 97 "a" */ CWORD_CWORD_CWORD_CWORD,
2950 /* 98 "b" */ CWORD_CWORD_CWORD_CWORD,
2951 /* 99 "c" */ CWORD_CWORD_CWORD_CWORD,
2952 /* 100 "d" */ CWORD_CWORD_CWORD_CWORD,
2953 /* 101 "e" */ CWORD_CWORD_CWORD_CWORD,
2954 /* 102 "f" */ CWORD_CWORD_CWORD_CWORD,
2955 /* 103 "g" */ CWORD_CWORD_CWORD_CWORD,
2956 /* 104 "h" */ CWORD_CWORD_CWORD_CWORD,
2957 /* 105 "i" */ CWORD_CWORD_CWORD_CWORD,
2958 /* 106 "j" */ CWORD_CWORD_CWORD_CWORD,
2959 /* 107 "k" */ CWORD_CWORD_CWORD_CWORD,
2960 /* 108 "l" */ CWORD_CWORD_CWORD_CWORD,
2961 /* 109 "m" */ CWORD_CWORD_CWORD_CWORD,
2962 /* 110 "n" */ CWORD_CWORD_CWORD_CWORD,
2963 /* 111 "o" */ CWORD_CWORD_CWORD_CWORD,
2964 /* 112 "p" */ CWORD_CWORD_CWORD_CWORD,
2965 /* 113 "q" */ CWORD_CWORD_CWORD_CWORD,
2966 /* 114 "r" */ CWORD_CWORD_CWORD_CWORD,
2967 /* 115 "s" */ CWORD_CWORD_CWORD_CWORD,
2968 /* 116 "t" */ CWORD_CWORD_CWORD_CWORD,
2969 /* 117 "u" */ CWORD_CWORD_CWORD_CWORD,
2970 /* 118 "v" */ CWORD_CWORD_CWORD_CWORD,
2971 /* 119 "w" */ CWORD_CWORD_CWORD_CWORD,
2972 /* 120 "x" */ CWORD_CWORD_CWORD_CWORD,
2973 /* 121 "y" */ CWORD_CWORD_CWORD_CWORD,
2974 /* 122 "z" */ CWORD_CWORD_CWORD_CWORD,
2975 /* 123 "{" */ CWORD_CWORD_CWORD_CWORD,
2976 /* 124 "|" */ CSPCL_CWORD_CWORD_CWORD,
2977 /* 125 "}" */ CENDVAR_CENDVAR_CWORD_CENDVAR,
2978 /* 126 "~" */ CWORD_CCTL_CCTL_CWORD,
2979 /* 127 del */ CWORD_CWORD_CWORD_CWORD,
2980 /* 128 0x80 */ CWORD_CWORD_CWORD_CWORD,
2981 /* 129 CTLESC */ CCTL_CCTL_CCTL_CCTL,
2982 /* 130 CTLVAR */ CCTL_CCTL_CCTL_CCTL,
2983 /* 131 CTLENDVAR */ CCTL_CCTL_CCTL_CCTL,
2984 /* 132 CTLBACKQ */ CCTL_CCTL_CCTL_CCTL,
2985 /* 133 CTLQUOTE */ CCTL_CCTL_CCTL_CCTL,
2986 /* 134 CTLARI */ CCTL_CCTL_CCTL_CCTL,
2987 /* 135 CTLENDARI */ CCTL_CCTL_CCTL_CCTL,
2988 /* 136 CTLQUOTEMARK */ CCTL_CCTL_CCTL_CCTL,
2989 /* 137 */ CWORD_CWORD_CWORD_CWORD,
2990 /* 138 */ CWORD_CWORD_CWORD_CWORD,
2991 /* 139 */ CWORD_CWORD_CWORD_CWORD,
2992 /* 140 */ CWORD_CWORD_CWORD_CWORD,
2993 /* 141 */ CWORD_CWORD_CWORD_CWORD,
2994 /* 142 */ CWORD_CWORD_CWORD_CWORD,
2995 /* 143 */ CWORD_CWORD_CWORD_CWORD,
2996 /* 144 */ CWORD_CWORD_CWORD_CWORD,
2997 /* 145 */ CWORD_CWORD_CWORD_CWORD,
2998 /* 146 */ CWORD_CWORD_CWORD_CWORD,
2999 /* 147 */ CWORD_CWORD_CWORD_CWORD,
3000 /* 148 */ CWORD_CWORD_CWORD_CWORD,
3001 /* 149 */ CWORD_CWORD_CWORD_CWORD,
3002 /* 150 */ CWORD_CWORD_CWORD_CWORD,
3003 /* 151 */ CWORD_CWORD_CWORD_CWORD,
3004 /* 152 */ CWORD_CWORD_CWORD_CWORD,
3005 /* 153 */ CWORD_CWORD_CWORD_CWORD,
3006 /* 154 */ CWORD_CWORD_CWORD_CWORD,
3007 /* 155 */ CWORD_CWORD_CWORD_CWORD,
3008 /* 156 */ CWORD_CWORD_CWORD_CWORD,
3009 /* 157 */ CWORD_CWORD_CWORD_CWORD,
3010 /* 158 */ CWORD_CWORD_CWORD_CWORD,
3011 /* 159 */ CWORD_CWORD_CWORD_CWORD,
3012 /* 160 */ CWORD_CWORD_CWORD_CWORD,
3013 /* 161 */ CWORD_CWORD_CWORD_CWORD,
3014 /* 162 */ CWORD_CWORD_CWORD_CWORD,
3015 /* 163 */ CWORD_CWORD_CWORD_CWORD,
3016 /* 164 */ CWORD_CWORD_CWORD_CWORD,
3017 /* 165 */ CWORD_CWORD_CWORD_CWORD,
3018 /* 166 */ CWORD_CWORD_CWORD_CWORD,
3019 /* 167 */ CWORD_CWORD_CWORD_CWORD,
3020 /* 168 */ CWORD_CWORD_CWORD_CWORD,
3021 /* 169 */ CWORD_CWORD_CWORD_CWORD,
3022 /* 170 */ CWORD_CWORD_CWORD_CWORD,
3023 /* 171 */ CWORD_CWORD_CWORD_CWORD,
3024 /* 172 */ CWORD_CWORD_CWORD_CWORD,
3025 /* 173 */ CWORD_CWORD_CWORD_CWORD,
3026 /* 174 */ CWORD_CWORD_CWORD_CWORD,
3027 /* 175 */ CWORD_CWORD_CWORD_CWORD,
3028 /* 176 */ CWORD_CWORD_CWORD_CWORD,
3029 /* 177 */ CWORD_CWORD_CWORD_CWORD,
3030 /* 178 */ CWORD_CWORD_CWORD_CWORD,
3031 /* 179 */ CWORD_CWORD_CWORD_CWORD,
3032 /* 180 */ CWORD_CWORD_CWORD_CWORD,
3033 /* 181 */ CWORD_CWORD_CWORD_CWORD,
3034 /* 182 */ CWORD_CWORD_CWORD_CWORD,
3035 /* 183 */ CWORD_CWORD_CWORD_CWORD,
3036 /* 184 */ CWORD_CWORD_CWORD_CWORD,
3037 /* 185 */ CWORD_CWORD_CWORD_CWORD,
3038 /* 186 */ CWORD_CWORD_CWORD_CWORD,
3039 /* 187 */ CWORD_CWORD_CWORD_CWORD,
3040 /* 188 */ CWORD_CWORD_CWORD_CWORD,
3041 /* 189 */ CWORD_CWORD_CWORD_CWORD,
3042 /* 190 */ CWORD_CWORD_CWORD_CWORD,
3043 /* 191 */ CWORD_CWORD_CWORD_CWORD,
3044 /* 192 */ CWORD_CWORD_CWORD_CWORD,
3045 /* 193 */ CWORD_CWORD_CWORD_CWORD,
3046 /* 194 */ CWORD_CWORD_CWORD_CWORD,
3047 /* 195 */ CWORD_CWORD_CWORD_CWORD,
3048 /* 196 */ CWORD_CWORD_CWORD_CWORD,
3049 /* 197 */ CWORD_CWORD_CWORD_CWORD,
3050 /* 198 */ CWORD_CWORD_CWORD_CWORD,
3051 /* 199 */ CWORD_CWORD_CWORD_CWORD,
3052 /* 200 */ CWORD_CWORD_CWORD_CWORD,
3053 /* 201 */ CWORD_CWORD_CWORD_CWORD,
3054 /* 202 */ CWORD_CWORD_CWORD_CWORD,
3055 /* 203 */ CWORD_CWORD_CWORD_CWORD,
3056 /* 204 */ CWORD_CWORD_CWORD_CWORD,
3057 /* 205 */ CWORD_CWORD_CWORD_CWORD,
3058 /* 206 */ CWORD_CWORD_CWORD_CWORD,
3059 /* 207 */ CWORD_CWORD_CWORD_CWORD,
3060 /* 208 */ CWORD_CWORD_CWORD_CWORD,
3061 /* 209 */ CWORD_CWORD_CWORD_CWORD,
3062 /* 210 */ CWORD_CWORD_CWORD_CWORD,
3063 /* 211 */ CWORD_CWORD_CWORD_CWORD,
3064 /* 212 */ CWORD_CWORD_CWORD_CWORD,
3065 /* 213 */ CWORD_CWORD_CWORD_CWORD,
3066 /* 214 */ CWORD_CWORD_CWORD_CWORD,
3067 /* 215 */ CWORD_CWORD_CWORD_CWORD,
3068 /* 216 */ CWORD_CWORD_CWORD_CWORD,
3069 /* 217 */ CWORD_CWORD_CWORD_CWORD,
3070 /* 218 */ CWORD_CWORD_CWORD_CWORD,
3071 /* 219 */ CWORD_CWORD_CWORD_CWORD,
3072 /* 220 */ CWORD_CWORD_CWORD_CWORD,
3073 /* 221 */ CWORD_CWORD_CWORD_CWORD,
3074 /* 222 */ CWORD_CWORD_CWORD_CWORD,
3075 /* 223 */ CWORD_CWORD_CWORD_CWORD,
3076 /* 224 */ CWORD_CWORD_CWORD_CWORD,
3077 /* 225 */ CWORD_CWORD_CWORD_CWORD,
3078 /* 226 */ CWORD_CWORD_CWORD_CWORD,
3079 /* 227 */ CWORD_CWORD_CWORD_CWORD,
3080 /* 228 */ CWORD_CWORD_CWORD_CWORD,
3081 /* 229 */ CWORD_CWORD_CWORD_CWORD,
3082 /* 230 */ CWORD_CWORD_CWORD_CWORD,
3083 /* 231 */ CWORD_CWORD_CWORD_CWORD,
3084 /* 232 */ CWORD_CWORD_CWORD_CWORD,
3085 /* 233 */ CWORD_CWORD_CWORD_CWORD,
3086 /* 234 */ CWORD_CWORD_CWORD_CWORD,
3087 /* 235 */ CWORD_CWORD_CWORD_CWORD,
3088 /* 236 */ CWORD_CWORD_CWORD_CWORD,
3089 /* 237 */ CWORD_CWORD_CWORD_CWORD,
3090 /* 238 */ CWORD_CWORD_CWORD_CWORD,
3091 /* 239 */ CWORD_CWORD_CWORD_CWORD,
3092 /* 230 */ CWORD_CWORD_CWORD_CWORD,
3093 /* 241 */ CWORD_CWORD_CWORD_CWORD,
3094 /* 242 */ CWORD_CWORD_CWORD_CWORD,
3095 /* 243 */ CWORD_CWORD_CWORD_CWORD,
3096 /* 244 */ CWORD_CWORD_CWORD_CWORD,
3097 /* 245 */ CWORD_CWORD_CWORD_CWORD,
3098 /* 246 */ CWORD_CWORD_CWORD_CWORD,
3099 /* 247 */ CWORD_CWORD_CWORD_CWORD,
3100 /* 248 */ CWORD_CWORD_CWORD_CWORD,
3101 /* 249 */ CWORD_CWORD_CWORD_CWORD,
3102 /* 250 */ CWORD_CWORD_CWORD_CWORD,
3103 /* 251 */ CWORD_CWORD_CWORD_CWORD,
3104 /* 252 */ CWORD_CWORD_CWORD_CWORD,
3105 /* 253 */ CWORD_CWORD_CWORD_CWORD,
3106 /* 254 */ CWORD_CWORD_CWORD_CWORD,
3107 /* 255 */ CWORD_CWORD_CWORD_CWORD,
3108 /* PEOF */ CENDFILE_CENDFILE_CENDFILE_CENDFILE,
3109 # if ENABLE_ASH_ALIAS
3110 /* PEOA */ CSPCL_CIGN_CIGN_CIGN,
3114 # define SIT(c, syntax) ((S_I_T[syntax_index_table[c]] >> ((syntax)*4)) & 0xf)
3116 #endif /* !USE_SIT_FUNCTION */
3119 /* ============ Alias handling */
3121 #if ENABLE_ASH_ALIAS
3123 #define ALIASINUSE 1
3134 static struct alias **atab; // [ATABSIZE];
3135 #define INIT_G_alias() do { \
3136 atab = xzalloc(ATABSIZE * sizeof(atab[0])); \
3140 static struct alias **
3141 __lookupalias(const char *name) {
3142 unsigned int hashval;
3149 ch = (unsigned char)*p;
3153 ch = (unsigned char)*++p;
3155 app = &atab[hashval % ATABSIZE];
3157 for (; *app; app = &(*app)->next) {
3158 if (strcmp(name, (*app)->name) == 0) {
3166 static struct alias *
3167 lookupalias(const char *name, int check)
3169 struct alias *ap = *__lookupalias(name);
3171 if (check && ap && (ap->flag & ALIASINUSE))
3176 static struct alias *
3177 freealias(struct alias *ap)
3181 if (ap->flag & ALIASINUSE) {
3182 ap->flag |= ALIASDEAD;
3194 setalias(const char *name, const char *val)
3196 struct alias *ap, **app;
3198 app = __lookupalias(name);
3202 if (!(ap->flag & ALIASINUSE)) {
3205 ap->val = ckstrdup(val);
3206 ap->flag &= ~ALIASDEAD;
3209 ap = ckzalloc(sizeof(struct alias));
3210 ap->name = ckstrdup(name);
3211 ap->val = ckstrdup(val);
3212 /*ap->flag = 0; - ckzalloc did it */
3213 /*ap->next = NULL;*/
3220 unalias(const char *name)
3224 app = __lookupalias(name);
3228 *app = freealias(*app);
3239 struct alias *ap, **app;
3243 for (i = 0; i < ATABSIZE; i++) {
3245 for (ap = *app; ap; ap = *app) {
3246 *app = freealias(*app);
3256 printalias(const struct alias *ap)
3258 out1fmt("%s=%s\n", ap->name, single_quote(ap->val));
3262 * TODO - sort output
3264 static int FAST_FUNC
3265 aliascmd(int argc UNUSED_PARAM, char **argv)
3274 for (i = 0; i < ATABSIZE; i++) {
3275 for (ap = atab[i]; ap; ap = ap->next) {
3281 while ((n = *++argv) != NULL) {
3282 v = strchr(n+1, '=');
3283 if (v == NULL) { /* n+1: funny ksh stuff */
3284 ap = *__lookupalias(n);
3286 fprintf(stderr, "%s: %s not found\n", "alias", n);
3299 static int FAST_FUNC
3300 unaliascmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
3304 while ((i = nextopt("a")) != '\0') {
3310 for (i = 0; *argptr; argptr++) {
3311 if (unalias(*argptr)) {
3312 fprintf(stderr, "%s: %s not found\n", "unalias", *argptr);
3320 #endif /* ASH_ALIAS */
3323 /* ============ jobs.c */
3325 /* Mode argument to forkshell. Don't change FORK_FG or FORK_BG. */
3328 #define FORK_NOJOB 2
3330 /* mode flags for showjob(s) */
3331 #define SHOW_ONLY_PGID 0x01 /* show only pgid (jobs -p) */
3332 #define SHOW_PIDS 0x02 /* show individual pids, not just one line per job */
3333 #define SHOW_CHANGED 0x04 /* only jobs whose state has changed */
3336 * A job structure contains information about a job. A job is either a
3337 * single process or a set of processes contained in a pipeline. In the
3338 * latter case, pidlist will be non-NULL, and will point to a -1 terminated
3342 pid_t ps_pid; /* process id */
3343 int ps_status; /* last process status from wait() */
3344 char *ps_cmd; /* text of command being run */
3348 struct procstat ps0; /* status of process */
3349 struct procstat *ps; /* status or processes when more than one */
3351 int stopstatus; /* status of a stopped job */
3354 nprocs: 16, /* number of processes */
3356 #define JOBRUNNING 0 /* at least one proc running */
3357 #define JOBSTOPPED 1 /* all procs are stopped */
3358 #define JOBDONE 2 /* all procs are completed */
3360 sigint: 1, /* job was killed by SIGINT */
3361 jobctl: 1, /* job running under job control */
3363 waited: 1, /* true if this entry has been waited for */
3364 used: 1, /* true if this entry is in used */
3365 changed: 1; /* true if status has changed */
3366 struct job *prev_job; /* previous job */
3369 static struct job *makejob(/*union node *,*/ int);
3370 static int forkshell(struct job *, union node *, int);
3371 static int waitforjob(struct job *);
3374 enum { doing_jobctl = 0 };
3375 #define setjobctl(on) do {} while (0)
3377 static smallint doing_jobctl; //references:8
3378 static void setjobctl(int);
3385 ignoresig(int signo)
3387 /* Avoid unnecessary system calls. Is it already SIG_IGNed? */
3388 if (sigmode[signo - 1] != S_IGN && sigmode[signo - 1] != S_HARD_IGN) {
3389 /* No, need to do it */
3390 signal(signo, SIG_IGN);
3392 sigmode[signo - 1] = S_HARD_IGN;
3396 * Only one usage site - in setsignal()
3399 signal_handler(int signo)
3401 gotsig[signo - 1] = 1;
3403 if (signo == SIGINT && !trap[SIGINT]) {
3404 if (!suppress_int) {
3406 raise_interrupt(); /* does not return */
3410 pending_sig = signo;
3415 * Set the signal handler for the specified signal. The routine figures
3416 * out what it should be set to.
3419 setsignal(int signo)
3422 char cur_act, new_act;
3423 struct sigaction act;
3427 if (t != NULL) { /* trap for this sig is set */
3429 if (t[0] == '\0') /* trap is "": ignore this sig */
3433 if (rootshell && new_act == S_DFL) {
3436 if (iflag || minusc || sflag == 0)
3445 * "In all cases, bash ignores SIGQUIT. Non-builtin
3446 * commands run by bash have signal handlers
3447 * set to the values inherited by the shell
3448 * from its parent". */
3464 //TODO: if !rootshell, we reset SIGQUIT to DFL,
3465 //whereas we have to restore it to what shell got on entry
3466 //from the parent. See comment above
3468 t = &sigmode[signo - 1];
3471 /* current setting is not yet known */
3472 if (sigaction(signo, NULL, &act)) {
3473 /* pretend it worked; maybe we should give a warning,
3474 * but other shells don't. We don't alter sigmode,
3475 * so we retry every time.
3476 * btw, in Linux it never fails. --vda */
3479 if (act.sa_handler == SIG_IGN) {
3480 cur_act = S_HARD_IGN;
3482 && (signo == SIGTSTP || signo == SIGTTIN || signo == SIGTTOU)
3484 cur_act = S_IGN; /* don't hard ignore these */
3488 if (cur_act == S_HARD_IGN || cur_act == new_act)
3491 act.sa_handler = SIG_DFL;
3494 act.sa_handler = signal_handler;
3497 act.sa_handler = SIG_IGN;
3501 /* flags and mask matter only if !DFL and !IGN, but we do it
3502 * for all cases for more deterministic behavior:
3505 sigfillset(&act.sa_mask);
3507 sigaction_set(signo, &act);
3512 /* mode flags for set_curjob */
3513 #define CUR_DELETE 2
3514 #define CUR_RUNNING 1
3515 #define CUR_STOPPED 0
3517 /* mode flags for dowait */
3518 #define DOWAIT_NONBLOCK WNOHANG
3519 #define DOWAIT_BLOCK 0
3522 /* pgrp of shell on invocation */
3523 static int initialpgrp; //references:2
3524 static int ttyfd = -1; //5
3527 static struct job *jobtab; //5
3529 static unsigned njobs; //4
3531 static struct job *curjob; //lots
3532 /* number of presumed living untracked jobs */
3533 static int jobless; //4
3536 set_curjob(struct job *jp, unsigned mode)
3539 struct job **jpp, **curp;
3541 /* first remove from list */
3542 jpp = curp = &curjob;
3547 jpp = &jp1->prev_job;
3549 *jpp = jp1->prev_job;
3551 /* Then re-insert in correct position */
3559 /* job being deleted */
3562 /* newly created job or backgrounded job,
3563 put after all stopped jobs. */
3567 if (!jp1 || jp1->state != JOBSTOPPED)
3570 jpp = &jp1->prev_job;
3576 /* newly stopped job - becomes curjob */
3577 jp->prev_job = *jpp;
3585 jobno(const struct job *jp)
3587 return jp - jobtab + 1;
3592 * Convert a job name to a job structure.
3595 #define getjob(name, getctl) getjob(name)
3598 getjob(const char *name, int getctl)
3602 const char *err_msg = "%s: no such job";
3606 char *(*match)(const char *, const char *);
3621 if (c == '+' || c == '%') {
3623 err_msg = "No current job";
3629 err_msg = "No previous job";
3640 jp = jobtab + num - 1;
3655 if (match(jp->ps[0].ps_cmd, p)) {
3659 err_msg = "%s: ambiguous";
3669 err_msg = "job %s not created under job control";
3670 if (getctl && jp->jobctl == 0)
3675 ash_msg_and_raise_error(err_msg, name);
3679 * Mark a job structure as unused.
3682 freejob(struct job *jp)
3684 struct procstat *ps;
3688 for (i = jp->nprocs, ps = jp->ps; --i >= 0; ps++) {
3689 if (ps->ps_cmd != nullstr)
3692 if (jp->ps != &jp->ps0)
3695 set_curjob(jp, CUR_DELETE);
3701 xtcsetpgrp(int fd, pid_t pgrp)
3703 if (tcsetpgrp(fd, pgrp))
3704 ash_msg_and_raise_error("can't set tty process group (%m)");
3708 * Turn job control on and off.
3710 * Note: This code assumes that the third arg to ioctl is a character
3711 * pointer, which is true on Berkeley systems but not System V. Since
3712 * System V doesn't have job control yet, this isn't a problem now.
3714 * Called with interrupts off.
3722 if (on == doing_jobctl || rootshell == 0)
3726 ofd = fd = open(_PATH_TTY, O_RDWR);
3728 /* BTW, bash will try to open(ttyname(0)) if open("/dev/tty") fails.
3729 * That sometimes helps to acquire controlling tty.
3730 * Obviously, a workaround for bugs when someone
3731 * failed to provide a controlling tty to bash! :) */
3737 fd = fcntl(fd, F_DUPFD, 10);
3742 /* fd is a tty at this point */
3743 close_on_exec_on(fd);
3744 while (1) { /* while we are in the background */
3745 pgrp = tcgetpgrp(fd);
3748 ash_msg("can't access tty; job control turned off");
3752 if (pgrp == getpgrp())
3763 xtcsetpgrp(fd, pgrp);
3765 /* turning job control off */
3768 /* was xtcsetpgrp, but this can make exiting ash
3769 * loop forever if pty is already deleted */
3770 tcsetpgrp(fd, pgrp);
3784 static int FAST_FUNC
3785 killcmd(int argc, char **argv)
3787 if (argv[1] && strcmp(argv[1], "-l") != 0) {
3790 if (argv[i][0] == '%') {
3792 * "kill %N" - job kill
3793 * Converting to pgrp / pid kill
3799 jp = getjob(argv[i], 0);
3801 * In jobs started under job control, we signal
3802 * entire process group by kill -PGRP_ID.
3803 * This happens, f.e., in interactive shell.
3805 * Otherwise, we signal each child via
3806 * kill PID1 PID2 PID3.
3808 * sh -c 'sleep 1|sleep 1 & kill %1'
3809 * sh -c 'true|sleep 2 & sleep 1; kill %1'
3810 * sh -c 'true|sleep 1 & sleep 2; kill %1'
3812 n = jp->nprocs; /* can't be 0 (I hope) */
3815 dst = alloca(n * sizeof(int)*4);
3817 for (j = 0; j < n; j++) {
3818 struct procstat *ps = &jp->ps[j];
3819 /* Skip non-running and not-stopped members
3820 * (i.e. dead members) of the job
3822 if (ps->ps_status != -1 && !WIFSTOPPED(ps->ps_status))
3825 * kill_main has matching code to expect
3826 * leading space. Needed to not confuse
3827 * negative pids with "kill -SIGNAL_NO" syntax
3829 dst += sprintf(dst, jp->jobctl ? " -%u" : " %u", (int)ps->ps_pid);
3833 } while (argv[++i]);
3835 return kill_main(argc, argv);
3839 showpipe(struct job *jp /*, FILE *out*/)
3841 struct procstat *ps;
3842 struct procstat *psend;
3844 psend = jp->ps + jp->nprocs;
3845 for (ps = jp->ps + 1; ps < psend; ps++)
3846 printf(" | %s", ps->ps_cmd);
3847 outcslow('\n', stdout);
3848 flush_stdout_stderr();
3853 restartjob(struct job *jp, int mode)
3855 struct procstat *ps;
3861 if (jp->state == JOBDONE)
3863 jp->state = JOBRUNNING;
3864 pgid = jp->ps[0].ps_pid;
3865 if (mode == FORK_FG)
3866 xtcsetpgrp(ttyfd, pgid);
3867 killpg(pgid, SIGCONT);
3871 if (WIFSTOPPED(ps->ps_status)) {
3877 status = (mode == FORK_FG) ? waitforjob(jp) : 0;
3882 static int FAST_FUNC
3883 fg_bgcmd(int argc UNUSED_PARAM, char **argv)
3889 mode = (**argv == 'f') ? FORK_FG : FORK_BG;
3893 jp = getjob(*argv, 1);
3894 if (mode == FORK_BG) {
3895 set_curjob(jp, CUR_RUNNING);
3896 printf("[%d] ", jobno(jp));
3898 out1str(jp->ps[0].ps_cmd);
3899 showpipe(jp /*, stdout*/);
3900 retval = restartjob(jp, mode);
3901 } while (*argv && *++argv);
3907 sprint_status(char *s, int status, int sigonly)
3913 if (!WIFEXITED(status)) {
3915 if (WIFSTOPPED(status))
3916 st = WSTOPSIG(status);
3919 st = WTERMSIG(status);
3921 if (st == SIGINT || st == SIGPIPE)
3924 if (WIFSTOPPED(status))
3929 //TODO: use bbox's get_signame? strsignal adds ~600 bytes to text+rodata
3930 col = fmtstr(s, 32, strsignal(st));
3931 if (WCOREDUMP(status)) {
3932 col += fmtstr(s + col, 16, " (core dumped)");
3934 } else if (!sigonly) {
3935 st = WEXITSTATUS(status);
3937 col = fmtstr(s, 16, "Done(%d)", st);
3939 col = fmtstr(s, 16, "Done");
3946 dowait(int wait_flags, struct job *job)
3951 struct job *thisjob;
3954 TRACE(("dowait(0x%x) called\n", wait_flags));
3956 /* Do a wait system call. If job control is compiled in, we accept
3957 * stopped processes. wait_flags may have WNOHANG, preventing blocking.
3958 * NB: _not_ safe_waitpid, we need to detect EINTR */
3960 wait_flags |= WUNTRACED;
3961 pid = waitpid(-1, &status, wait_flags);
3962 TRACE(("wait returns pid=%d, status=0x%x, errno=%d(%s)\n",
3963 pid, status, errno, strerror(errno)));
3969 for (jp = curjob; jp; jp = jp->prev_job) {
3970 struct procstat *ps;
3971 struct procstat *psend;
3972 if (jp->state == JOBDONE)
3976 psend = ps + jp->nprocs;
3978 if (ps->ps_pid == pid) {
3979 TRACE(("Job %d: changing status of proc %d "
3980 "from 0x%x to 0x%x\n",
3981 jobno(jp), pid, ps->ps_status, status));
3982 ps->ps_status = status;
3985 if (ps->ps_status == -1)
3988 if (state == JOBRUNNING)
3990 if (WIFSTOPPED(ps->ps_status)) {
3991 jp->stopstatus = ps->ps_status;
3995 } while (++ps < psend);
4000 if (!WIFSTOPPED(status))
4006 if (state != JOBRUNNING) {
4007 thisjob->changed = 1;
4009 if (thisjob->state != state) {
4010 TRACE(("Job %d: changing state from %d to %d\n",
4011 jobno(thisjob), thisjob->state, state));
4012 thisjob->state = state;
4014 if (state == JOBSTOPPED) {
4015 set_curjob(thisjob, CUR_STOPPED);
4024 if (thisjob && thisjob == job) {
4028 len = sprint_status(s, status, 1);
4039 blocking_wait_with_raise_on_sig(void)
4041 pid_t pid = dowait(DOWAIT_BLOCK, NULL);
4042 if (pid <= 0 && pending_sig)
4043 raise_exception(EXSIG);
4049 showjob(FILE *out, struct job *jp, int mode)
4051 struct procstat *ps;
4052 struct procstat *psend;
4059 if (mode & SHOW_ONLY_PGID) { /* jobs -p */
4060 /* just output process (group) id of pipeline */
4061 fprintf(out, "%d\n", ps->ps_pid);
4065 col = fmtstr(s, 16, "[%d] ", jobno(jp));
4070 else if (curjob && jp == curjob->prev_job)
4073 if (mode & SHOW_PIDS)
4074 col += fmtstr(s + col, 16, "%d ", ps->ps_pid);
4076 psend = ps + jp->nprocs;
4078 if (jp->state == JOBRUNNING) {
4079 strcpy(s + col, "Running");
4080 col += sizeof("Running") - 1;
4082 int status = psend[-1].ps_status;
4083 if (jp->state == JOBSTOPPED)
4084 status = jp->stopstatus;
4085 col += sprint_status(s + col, status, 0);
4087 /* By now, "[JOBID]* [maybe PID] STATUS" is printed */
4089 /* This loop either prints "<cmd1> | <cmd2> | <cmd3>" line
4090 * or prints several "PID | <cmdN>" lines,
4091 * depending on SHOW_PIDS bit.
4092 * We do not print status of individual processes
4093 * between PID and <cmdN>. bash does it, but not very well:
4094 * first line shows overall job status, not process status,
4095 * making it impossible to know 1st process status.
4099 /* for each process */
4102 if (mode & SHOW_PIDS)
4103 col = fmtstr(s, 48, "\n%*c%d ", indent_col, ' ', ps->ps_pid) - 1;
4105 fprintf(out, "%s%*c%s%s",
4107 33 - col >= 0 ? 33 - col : 0, ' ',
4108 ps == jp->ps ? "" : "| ",
4111 } while (++ps != psend);
4112 outcslow('\n', out);
4116 if (jp->state == JOBDONE) {
4117 TRACE(("showjob: freeing job %d\n", jobno(jp)));
4123 * Print a list of jobs. If "change" is nonzero, only print jobs whose
4124 * statuses have changed since the last call to showjobs.
4127 showjobs(FILE *out, int mode)
4131 TRACE(("showjobs(0x%x) called\n", mode));
4133 /* Handle all finished jobs */
4134 while (dowait(DOWAIT_NONBLOCK, NULL) > 0)
4137 for (jp = curjob; jp; jp = jp->prev_job) {
4138 if (!(mode & SHOW_CHANGED) || jp->changed) {
4139 showjob(out, jp, mode);
4144 static int FAST_FUNC
4145 jobscmd(int argc UNUSED_PARAM, char **argv)
4150 while ((m = nextopt("lp")) != '\0') {
4154 mode |= SHOW_ONLY_PGID;
4160 showjob(stdout, getjob(*argv, 0), mode);
4163 showjobs(stdout, mode);
4170 /* Called only on finished or stopped jobs (no members are running) */
4172 getstatus(struct job *job)
4176 struct procstat *ps;
4178 /* Fetch last member's status */
4179 ps = job->ps + job->nprocs - 1;
4180 status = ps->ps_status;
4182 /* "set -o pipefail" mode: use last _nonzero_ status */
4183 while (status == 0 && --ps >= job->ps)
4184 status = ps->ps_status;
4187 retval = WEXITSTATUS(status);
4188 if (!WIFEXITED(status)) {
4190 retval = WSTOPSIG(status);
4191 if (!WIFSTOPPED(status))
4194 /* XXX: limits number of signals */
4195 retval = WTERMSIG(status);
4197 if (retval == SIGINT)
4203 TRACE(("getstatus: job %d, nproc %d, status 0x%x, retval 0x%x\n",
4204 jobno(job), job->nprocs, status, retval));
4208 static int FAST_FUNC
4209 waitcmd(int argc UNUSED_PARAM, char **argv)
4216 raise_exception(EXSIG);
4223 /* wait for all jobs */
4227 if (!jp) /* no running procs */
4229 if (jp->state == JOBRUNNING)
4234 blocking_wait_with_raise_on_sig();
4236 * "When bash is waiting for an asynchronous command via
4237 * the wait builtin, the reception of a signal for which a trap
4238 * has been set will cause the wait builtin to return immediately
4239 * with an exit status greater than 128, immediately after which
4240 * the trap is executed."
4242 * blocking_wait_with_raise_on_sig raises signal handlers
4243 * if it gets no pid (pid < 0). However,
4244 * if child sends us a signal *and immediately exits*,
4245 * blocking_wait_with_raise_on_sig gets pid > 0
4246 * and does not handle pending_sig. Check this case: */
4248 raise_exception(EXSIG);
4254 if (**argv != '%') {
4255 pid_t pid = number(*argv);
4260 if (job->ps[job->nprocs - 1].ps_pid == pid)
4262 job = job->prev_job;
4265 job = getjob(*argv, 0);
4267 /* loop until process terminated or stopped */
4268 while (job->state == JOBRUNNING)
4269 blocking_wait_with_raise_on_sig();
4271 retval = getstatus(job);
4284 struct job *jp, *jq;
4286 len = njobs * sizeof(*jp);
4288 jp = ckrealloc(jq, len + 4 * sizeof(*jp));
4290 offset = (char *)jp - (char *)jq;
4292 /* Relocate pointers */
4295 jq = (struct job *)((char *)jq + l);
4299 #define joff(p) ((struct job *)((char *)(p) + l))
4300 #define jmove(p) (p) = (void *)((char *)(p) + offset)
4301 if (joff(jp)->ps == &jq->ps0)
4302 jmove(joff(jp)->ps);
4303 if (joff(jp)->prev_job)
4304 jmove(joff(jp)->prev_job);
4314 jp = (struct job *)((char *)jp + len);
4318 } while (--jq >= jp);
4323 * Return a new job structure.
4324 * Called with interrupts off.
4327 makejob(/*union node *node,*/ int nprocs)
4332 for (i = njobs, jp = jobtab; ; jp++) {
4339 if (jp->state != JOBDONE || !jp->waited)
4348 memset(jp, 0, sizeof(*jp));
4350 /* jp->jobctl is a bitfield.
4351 * "jp->jobctl |= jobctl" likely to give awful code */
4355 jp->prev_job = curjob;
4360 jp->ps = ckmalloc(nprocs * sizeof(struct procstat));
4362 TRACE(("makejob(%d) returns %%%d\n", nprocs,
4369 * Return a string identifying a command (to be printed by the
4372 static char *cmdnextc;
4375 cmdputs(const char *s)
4377 static const char vstype[VSTYPE + 1][3] = {
4378 "", "}", "-", "+", "?", "=",
4379 "%", "%%", "#", "##"
4380 IF_ASH_BASH_COMPAT(, ":", "/", "//")
4383 const char *p, *str;
4387 unsigned char subtype = 0;
4391 nextc = makestrspace((strlen(s) + 1) * 8, cmdnextc);
4393 while ((c = *p++) != '\0') {
4401 if ((subtype & VSTYPE) == VSLENGTH)
4405 if (!(subtype & VSQUOTE) == !(quoted & 1))
4411 str = "\"}" + !(quoted & 1);
4418 case CTLBACKQ+CTLQUOTE:
4421 #if ENABLE_SH_MATH_SUPPORT
4436 if ((subtype & VSTYPE) != VSNORMAL)
4438 str = vstype[subtype & VSTYPE];
4439 if (subtype & VSNUL)
4448 /* These can only happen inside quotes */
4461 while ((c = *str++) != '\0') {
4464 } /* while *p++ not NUL */
4467 USTPUTC('"', nextc);
4473 /* cmdtxt() and cmdlist() call each other */
4474 static void cmdtxt(union node *n);
4477 cmdlist(union node *np, int sep)
4479 for (; np; np = np->narg.next) {
4483 if (sep && np->narg.next)
4489 cmdtxt(union node *n)
4492 struct nodelist *lp;
4503 lp = n->npipe.cmdlist;
4521 cmdtxt(n->nbinary.ch1);
4537 cmdtxt(n->nif.test);
4539 if (n->nif.elsepart) {
4540 cmdtxt(n->nif.ifpart);
4542 n = n->nif.elsepart;
4560 cmdtxt(n->nbinary.ch1);
4570 cmdputs(n->nfor.var);
4572 cmdlist(n->nfor.args, 1);
4577 cmdputs(n->narg.text);
4581 cmdlist(n->ncmd.args, 1);
4582 cmdlist(n->ncmd.redirect, 0);
4595 cmdputs(n->ncase.expr->narg.text);
4597 for (np = n->ncase.cases; np; np = np->nclist.next) {
4598 cmdtxt(np->nclist.pattern);
4600 cmdtxt(np->nclist.body);
4614 #if ENABLE_ASH_BASH_COMPAT
4629 cmdputs(utoa(n->nfile.fd));
4631 if (n->type == NTOFD || n->type == NFROMFD) {
4632 cmdputs(utoa(n->ndup.dupfd));
4641 commandtext(union node *n)
4645 STARTSTACKSTR(cmdnextc);
4647 name = stackblock();
4648 TRACE(("commandtext: name %p, end %p\n\t\"%s\"\n",
4649 name, cmdnextc, cmdnextc));
4650 return ckstrdup(name);
4655 * Fork off a subshell. If we are doing job control, give the subshell its
4656 * own process group. Jp is a job structure that the job is to be added to.
4657 * N is the command that will be evaluated by the child. Both jp and n may
4658 * be NULL. The mode parameter can be one of the following:
4659 * FORK_FG - Fork off a foreground process.
4660 * FORK_BG - Fork off a background process.
4661 * FORK_NOJOB - Like FORK_FG, but don't give the process its own
4662 * process group even if job control is on.
4664 * When job control is turned off, background processes have their standard
4665 * input redirected to /dev/null (except for the second and later processes
4668 * Called with interrupts off.
4671 * Clear traps on a fork.
4678 for (tp = trap; tp < &trap[NSIG]; tp++) {
4679 if (*tp && **tp) { /* trap not NULL or "" (SIG_IGN) */
4681 if (trap_ptr == trap)
4683 /* else: it "belongs" to trap_ptr vector, don't free */
4685 if ((tp - trap) != 0)
4686 setsignal(tp - trap);
4693 /* Lives far away from here, needed for forkchild */
4694 static void closescript(void);
4696 /* Called after fork(), in child */
4697 static NOINLINE void
4698 forkchild(struct job *jp, union node *n, int mode)
4702 TRACE(("Child shell %d\n", getpid()));
4706 /* man bash: "Non-builtin commands run by bash have signal handlers
4707 * set to the values inherited by the shell from its parent".
4708 * Do we do it correctly? */
4712 if (mode == FORK_NOJOB /* is it `xxx` ? */
4713 && n && n->type == NCMD /* is it single cmd? */
4714 /* && n->ncmd.args->type == NARG - always true? */
4715 && n->ncmd.args && strcmp(n->ncmd.args->narg.text, "trap") == 0
4716 && n->ncmd.args->narg.next == NULL /* "trap" with no arguments */
4717 /* && n->ncmd.args->narg.backquote == NULL - do we need to check this? */
4719 TRACE(("Trap hack\n"));
4720 /* Awful hack for `trap` or $(trap).
4722 * http://www.opengroup.org/onlinepubs/009695399/utilities/trap.html
4723 * contains an example where "trap" is executed in a subshell:
4725 * save_traps=$(trap)
4727 * eval "$save_traps"
4729 * Standard does not say that "trap" in subshell shall print
4730 * parent shell's traps. It only says that its output
4731 * must have suitable form, but then, in the above example
4732 * (which is not supposed to be normative), it implies that.
4734 * bash (and probably other shell) does implement it
4735 * (traps are reset to defaults, but "trap" still shows them),
4736 * but as a result, "trap" logic is hopelessly messed up:
4739 * trap -- 'echo Ho' SIGWINCH <--- we have a handler
4740 * # (trap) <--- trap is in subshell - no output (correct, traps are reset)
4741 * # true | trap <--- trap is in subshell - no output (ditto)
4742 * # echo `true | trap` <--- in subshell - output (but traps are reset!)
4743 * trap -- 'echo Ho' SIGWINCH
4744 * # echo `(trap)` <--- in subshell in subshell - output
4745 * trap -- 'echo Ho' SIGWINCH
4746 * # echo `true | (trap)` <--- in subshell in subshell in subshell - output!
4747 * trap -- 'echo Ho' SIGWINCH
4749 * The rules when to forget and when to not forget traps
4750 * get really complex and nonsensical.
4752 * Our solution: ONLY bare $(trap) or `trap` is special.
4754 /* Save trap handler strings for trap builtin to print */
4755 trap_ptr = memcpy(xmalloc(sizeof(trap)), trap, sizeof(trap));
4756 /* Fall through into clearing traps */
4760 /* do job control only in root shell */
4762 if (mode != FORK_NOJOB && jp->jobctl && oldlvl == 0) {
4765 if (jp->nprocs == 0)
4768 pgrp = jp->ps[0].ps_pid;
4769 /* this can fail because we are doing it in the parent also */
4771 if (mode == FORK_FG)
4772 xtcsetpgrp(ttyfd, pgrp);
4777 if (mode == FORK_BG) {
4778 /* man bash: "When job control is not in effect,
4779 * asynchronous commands ignore SIGINT and SIGQUIT" */
4782 if (jp->nprocs == 0) {
4784 if (open(bb_dev_null, O_RDONLY) != 0)
4785 ash_msg_and_raise_error("can't open '%s'", bb_dev_null);
4789 if (iflag) { /* why if iflag only? */
4794 * "In all cases, bash ignores SIGQUIT. Non-builtin
4795 * commands run by bash have signal handlers
4796 * set to the values inherited by the shell
4798 * Take care of the second rule: */
4802 if (n && n->type == NCMD
4803 && n->ncmd.args && strcmp(n->ncmd.args->narg.text, "jobs") == 0
4805 TRACE(("Job hack\n"));
4806 /* "jobs": we do not want to clear job list for it,
4807 * instead we remove only _its_ own_ job from job list.
4808 * This makes "jobs .... | cat" more useful.
4814 for (jp = curjob; jp; jp = jp->prev_job)
4819 /* Called after fork(), in parent */
4821 #define forkparent(jp, n, mode, pid) forkparent(jp, mode, pid)
4824 forkparent(struct job *jp, union node *n, int mode, pid_t pid)
4826 TRACE(("In parent shell: child = %d\n", pid));
4828 while (jobless && dowait(DOWAIT_NONBLOCK, NULL) > 0)
4834 if (mode != FORK_NOJOB && jp->jobctl) {
4837 if (jp->nprocs == 0)
4840 pgrp = jp->ps[0].ps_pid;
4841 /* This can fail because we are doing it in the child also */
4845 if (mode == FORK_BG) {
4846 backgndpid = pid; /* set $! */
4847 set_curjob(jp, CUR_RUNNING);
4850 struct procstat *ps = &jp->ps[jp->nprocs++];
4853 ps->ps_cmd = nullstr;
4855 if (doing_jobctl && n)
4856 ps->ps_cmd = commandtext(n);
4862 forkshell(struct job *jp, union node *n, int mode)
4866 TRACE(("forkshell(%%%d, %p, %d) called\n", jobno(jp), n, mode));
4869 TRACE(("Fork failed, errno=%d", errno));
4872 ash_msg_and_raise_error("can't fork");
4875 CLEAR_RANDOM_T(&random_gen); /* or else $RANDOM repeats in child */
4876 forkchild(jp, n, mode);
4878 forkparent(jp, n, mode, pid);
4884 * Wait for job to finish.
4886 * Under job control we have the problem that while a child process
4887 * is running interrupts generated by the user are sent to the child
4888 * but not to the shell. This means that an infinite loop started by
4889 * an interactive user may be hard to kill. With job control turned off,
4890 * an interactive user may place an interactive program inside a loop.
4891 * If the interactive program catches interrupts, the user doesn't want
4892 * these interrupts to also abort the loop. The approach we take here
4893 * is to have the shell ignore interrupt signals while waiting for a
4894 * foreground process to terminate, and then send itself an interrupt
4895 * signal if the child process was terminated by an interrupt signal.
4896 * Unfortunately, some programs want to do a bit of cleanup and then
4897 * exit on interrupt; unless these processes terminate themselves by
4898 * sending a signal to themselves (instead of calling exit) they will
4899 * confuse this approach.
4901 * Called with interrupts off.
4904 waitforjob(struct job *jp)
4908 TRACE(("waitforjob(%%%d) called\n", jobno(jp)));
4911 while (jp->state == JOBRUNNING) {
4912 /* In non-interactive shells, we _can_ get
4913 * a keyboard signal here and be EINTRed,
4914 * but we just loop back, waiting for command to complete.
4917 * "If bash is waiting for a command to complete and receives
4918 * a signal for which a trap has been set, the trap
4919 * will not be executed until the command completes."
4921 * Reality is that even if trap is not set, bash
4922 * will not act on the signal until command completes.
4923 * Try this. sleep5intoff.c:
4924 * #include <signal.h>
4925 * #include <unistd.h>
4928 * sigemptyset(&set);
4929 * sigaddset(&set, SIGINT);
4930 * sigaddset(&set, SIGQUIT);
4931 * sigprocmask(SIG_BLOCK, &set, NULL);
4935 * $ bash -c './sleep5intoff; echo hi'
4936 * ^C^C^C^C <--- pressing ^C once a second
4938 * $ bash -c './sleep5intoff; echo hi'
4939 * ^\^\^\^\hi <--- pressing ^\ (SIGQUIT)
4942 dowait(DOWAIT_BLOCK, jp);
4949 xtcsetpgrp(ttyfd, rootpid);
4951 * This is truly gross.
4952 * If we're doing job control, then we did a TIOCSPGRP which
4953 * caused us (the shell) to no longer be in the controlling
4954 * session -- so we wouldn't have seen any ^C/SIGINT. So, we
4955 * intuit from the subprocess exit status whether a SIGINT
4956 * occurred, and if so interrupt ourselves. Yuck. - mycroft
4958 if (jp->sigint) /* TODO: do the same with all signals */
4959 raise(SIGINT); /* ... by raise(jp->sig) instead? */
4961 if (jp->state == JOBDONE)
4968 * return 1 if there are stopped jobs, otherwise 0
4980 if (jp && jp->state == JOBSTOPPED) {
4981 out2str("You have stopped jobs.\n");
4990 /* ============ redir.c
4992 * Code for dealing with input/output redirection.
4997 #define EMPTY -2 /* marks an unused slot in redirtab */
4998 #define CLOSED -3 /* marks a slot of previously-closed fd */
5001 * Open a file in noclobber mode.
5002 * The code was copied from bash.
5005 noclobberopen(const char *fname)
5008 struct stat finfo, finfo2;
5011 * If the file exists and is a regular file, return an error
5014 r = stat(fname, &finfo);
5015 if (r == 0 && S_ISREG(finfo.st_mode)) {
5021 * If the file was not present (r != 0), make sure we open it
5022 * exclusively so that if it is created before we open it, our open
5023 * will fail. Make sure that we do not truncate an existing file.
5024 * Note that we don't turn on O_EXCL unless the stat failed -- if the
5025 * file was not a regular file, we leave O_EXCL off.
5028 return open(fname, O_WRONLY|O_CREAT|O_EXCL, 0666);
5029 fd = open(fname, O_WRONLY|O_CREAT, 0666);
5031 /* If the open failed, return the file descriptor right away. */
5036 * OK, the open succeeded, but the file may have been changed from a
5037 * non-regular file to a regular file between the stat and the open.
5038 * We are assuming that the O_EXCL open handles the case where FILENAME
5039 * did not exist and is symlinked to an existing file between the stat
5044 * If we can open it and fstat the file descriptor, and neither check
5045 * revealed that it was a regular file, and the file has not been
5046 * replaced, return the file descriptor.
5048 if (fstat(fd, &finfo2) == 0
5049 && !S_ISREG(finfo2.st_mode)
5050 && finfo.st_dev == finfo2.st_dev
5051 && finfo.st_ino == finfo2.st_ino
5056 /* The file has been replaced. badness. */
5063 * Handle here documents. Normally we fork off a process to write the
5064 * data to a pipe. If the document is short, we can stuff the data in
5065 * the pipe without forking.
5067 /* openhere needs this forward reference */
5068 static void expandhere(union node *arg, int fd);
5070 openhere(union node *redir)
5076 ash_msg_and_raise_error("pipe call failed");
5077 if (redir->type == NHERE) {
5078 len = strlen(redir->nhere.doc->narg.text);
5079 if (len <= PIPE_BUF) {
5080 full_write(pip[1], redir->nhere.doc->narg.text, len);
5084 if (forkshell((struct job *)NULL, (union node *)NULL, FORK_NOJOB) == 0) {
5087 ignoresig(SIGINT); //signal(SIGINT, SIG_IGN);
5088 ignoresig(SIGQUIT); //signal(SIGQUIT, SIG_IGN);
5089 ignoresig(SIGHUP); //signal(SIGHUP, SIG_IGN);
5090 ignoresig(SIGTSTP); //signal(SIGTSTP, SIG_IGN);
5091 signal(SIGPIPE, SIG_DFL);
5092 if (redir->type == NHERE)
5093 full_write(pip[1], redir->nhere.doc->narg.text, len);
5095 expandhere(redir->nhere.doc, pip[1]);
5096 _exit(EXIT_SUCCESS);
5104 openredirect(union node *redir)
5109 fname = redir->nfile.expfname;
5110 switch (redir->nfile.type) {
5112 f = open(fname, O_RDONLY);
5117 f = open(fname, O_RDWR|O_CREAT, 0666);
5122 #if ENABLE_ASH_BASH_COMPAT
5125 /* Take care of noclobber mode. */
5127 f = noclobberopen(fname);
5134 f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666);
5139 f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666);
5147 /* Fall through to eliminate warning. */
5148 /* Our single caller does this itself */
5155 f = openhere(redir);
5161 ash_msg_and_raise_error("can't create %s: %s", fname, errmsg(errno, "nonexistent directory"));
5163 ash_msg_and_raise_error("can't open %s: %s", fname, errmsg(errno, "no such file"));
5167 * Copy a file descriptor to be >= to. Returns -1
5168 * if the source file descriptor is closed, EMPTY if there are no unused
5169 * file descriptors left.
5171 /* 0x800..00: bit to set in "to" to request dup2 instead of fcntl(F_DUPFD).
5172 * old code was doing close(to) prior to copyfd() to achieve the same */
5174 COPYFD_EXACT = (int)~(INT_MAX),
5175 COPYFD_RESTORE = (int)((unsigned)COPYFD_EXACT >> 1),
5178 copyfd(int from, int to)
5182 if (to & COPYFD_EXACT) {
5183 to &= ~COPYFD_EXACT;
5185 newfd = dup2(from, to);
5187 newfd = fcntl(from, F_DUPFD, to);
5190 if (errno == EMFILE)
5192 /* Happens when source fd is not open: try "echo >&99" */
5193 ash_msg_and_raise_error("%d: %m", from);
5198 /* Struct def and variable are moved down to the first usage site */
5203 struct redirtab *next;
5206 struct two_fd_t two_fd[];
5208 #define redirlist (G_var.redirlist)
5210 static int need_to_remember(struct redirtab *rp, int fd)
5214 if (!rp) /* remembering was not requested */
5217 for (i = 0; i < rp->pair_count; i++) {
5218 if (rp->two_fd[i].orig == fd) {
5219 /* already remembered */
5226 /* "hidden" fd is a fd used to read scripts, or a copy of such */
5227 static int is_hidden_fd(struct redirtab *rp, int fd)
5230 struct parsefile *pf;
5234 /* Check open scripts' fds */
5237 /* We skip pf_fd == 0 case because of the following case:
5238 * $ ash # running ash interactively
5240 * and in script.sh: "exec 9>&0".
5241 * Even though top-level pf_fd _is_ 0,
5242 * it's still ok to use it: "read" builtin uses it,
5243 * why should we cripple "exec" builtin?
5245 if (pf->pf_fd > 0 && fd == pf->pf_fd) {
5253 /* Check saved fds of redirects */
5254 fd |= COPYFD_RESTORE;
5255 for (i = 0; i < rp->pair_count; i++) {
5256 if (rp->two_fd[i].copy == fd) {
5264 * Process a list of redirection commands. If the REDIR_PUSH flag is set,
5265 * old file descriptors are stashed away so that the redirection can be
5266 * undone by calling popredir.
5268 /* flags passed to redirect */
5269 #define REDIR_PUSH 01 /* save previous values of file descriptors */
5270 #define REDIR_SAVEFD2 03 /* set preverrout */
5272 redirect(union node *redir, int flags)
5274 struct redirtab *sv;
5279 int copied_fd2 = -1;
5289 if (flags & REDIR_PUSH) {
5290 union node *tmp = redir;
5293 #if ENABLE_ASH_BASH_COMPAT
5294 if (tmp->nfile.type == NTO2)
5297 tmp = tmp->nfile.next;
5299 sv = ckmalloc(sizeof(*sv) + sv_pos * sizeof(sv->two_fd[0]));
5300 sv->next = redirlist;
5301 sv->pair_count = sv_pos;
5303 sv->nullredirs = g_nullredirs - 1;
5305 while (sv_pos > 0) {
5307 sv->two_fd[sv_pos].orig = sv->two_fd[sv_pos].copy = EMPTY;
5313 fd = redir->nfile.fd;
5314 if (redir->nfile.type == NTOFD || redir->nfile.type == NFROMFD) {
5315 right_fd = redir->ndup.dupfd;
5316 //bb_error_msg("doing %d > %d", fd, right_fd);
5317 /* redirect from/to same file descriptor? */
5320 /* "echo >&10" and 10 is a fd opened to a sh script? */
5321 if (is_hidden_fd(sv, right_fd)) {
5322 errno = EBADF; /* as if it is closed */
5323 ash_msg_and_raise_error("%d: %m", right_fd);
5327 newfd = openredirect(redir); /* always >= 0 */
5329 /* Descriptor wasn't open before redirect.
5330 * Mark it for close in the future */
5331 if (need_to_remember(sv, fd)) {
5332 goto remember_to_close;
5337 #if ENABLE_ASH_BASH_COMPAT
5340 if (need_to_remember(sv, fd)) {
5341 /* Copy old descriptor */
5342 /* Careful to not accidentally "save"
5343 * to the same fd as right side fd in N>&M */
5344 int minfd = right_fd < 10 ? 10 : right_fd + 1;
5345 i = fcntl(fd, F_DUPFD, minfd);
5346 /* You'd expect copy to be CLOEXECed. Currently these extra "saved" fds
5347 * are closed in popredir() in the child, preventing them from leaking
5348 * into child. (popredir() also cleans up the mess in case of failures)
5353 /* Strange error (e.g. "too many files" EMFILE?) */
5357 ash_msg_and_raise_error("%d: %m", fd);
5360 /* EBADF: it is not open - good, remember to close it */
5363 } else { /* fd is open, save its copy */
5364 /* "exec fd>&-" should not close fds
5365 * which point to script file(s).
5366 * Force them to be restored afterwards */
5367 if (is_hidden_fd(sv, fd))
5368 i |= COPYFD_RESTORE;
5372 sv->two_fd[sv_pos].orig = fd;
5373 sv->two_fd[sv_pos].copy = i;
5377 /* NTOFD/NFROMFD: copy redir->ndup.dupfd to fd */
5378 if (redir->ndup.dupfd < 0) { /* "fd>&-" */
5379 /* Don't want to trigger debugging */
5383 copyfd(redir->ndup.dupfd, fd | COPYFD_EXACT);
5385 } else if (fd != newfd) { /* move newfd to fd */
5386 copyfd(newfd, fd | COPYFD_EXACT);
5387 #if ENABLE_ASH_BASH_COMPAT
5388 if (!(redir->nfile.type == NTO2 && fd == 2))
5392 #if ENABLE_ASH_BASH_COMPAT
5393 if (redir->nfile.type == NTO2 && fd == 1) {
5394 /* We already redirected it to fd 1, now copy it to 2 */
5400 } while ((redir = redir->nfile.next) != NULL);
5403 if ((flags & REDIR_SAVEFD2) && copied_fd2 >= 0)
5404 preverrout_fd = copied_fd2;
5408 * Undo the effects of the last redirection.
5411 popredir(int drop, int restore)
5413 struct redirtab *rp;
5416 if (--g_nullredirs >= 0)
5420 for (i = 0; i < rp->pair_count; i++) {
5421 int fd = rp->two_fd[i].orig;
5422 int copy = rp->two_fd[i].copy;
5423 if (copy == CLOSED) {
5428 if (copy != EMPTY) {
5429 if (!drop || (restore && (copy & COPYFD_RESTORE))) {
5430 copy &= ~COPYFD_RESTORE;
5432 copyfd(copy, fd | COPYFD_EXACT);
5434 close(copy & ~COPYFD_RESTORE);
5437 redirlist = rp->next;
5438 g_nullredirs = rp->nullredirs;
5444 * Undo all redirections. Called on error or interrupt.
5448 * Discard all saved file descriptors.
5451 clearredir(int drop)
5457 popredir(drop, /*restore:*/ 0);
5462 redirectsafe(union node *redir, int flags)
5465 volatile int saveint;
5466 struct jmploc *volatile savehandler = exception_handler;
5467 struct jmploc jmploc;
5470 /* "echo 9>/dev/null; echo >&9; echo result: $?" - result should be 1, not 2! */
5471 err = setjmp(jmploc.loc); // huh?? was = setjmp(jmploc.loc) * 2;
5473 exception_handler = &jmploc;
5474 redirect(redir, flags);
5476 exception_handler = savehandler;
5477 if (err && exception_type != EXERROR)
5478 longjmp(exception_handler->loc, 1);
5479 RESTORE_INT(saveint);
5484 /* ============ Routines to expand arguments to commands
5486 * We have to deal with backquotes, shell variables, and file metacharacters.
5489 #if ENABLE_SH_MATH_SUPPORT
5491 ash_arith(const char *s)
5493 arith_state_t math_state;
5496 math_state.lookupvar = lookupvar;
5497 math_state.setvar = setvar2;
5498 //math_state.endofname = endofname;
5501 result = arith(&math_state, s);
5502 if (math_state.errmsg)
5503 ash_msg_and_raise_error(math_state.errmsg);
5513 #define EXP_FULL 0x1 /* perform word splitting & file globbing */
5514 #define EXP_TILDE 0x2 /* do normal tilde expansion */
5515 #define EXP_VARTILDE 0x4 /* expand tildes in an assignment */
5516 #define EXP_REDIR 0x8 /* file glob for a redirection (1 match only) */
5517 #define EXP_CASE 0x10 /* keeps quotes around for CASE pattern */
5518 #define EXP_RECORD 0x20 /* need to record arguments for ifs breakup */
5519 #define EXP_VARTILDE2 0x40 /* expand tildes after colons only */
5520 #define EXP_WORD 0x80 /* expand word in parameter expansion */
5521 #define EXP_QWORD 0x100 /* expand word in quoted parameter expansion */
5525 #define RMESCAPE_ALLOC 0x1 /* Allocate a new string */
5526 #define RMESCAPE_GLOB 0x2 /* Add backslashes for glob */
5527 #define RMESCAPE_QUOTED 0x4 /* Remove CTLESC unless in quotes */
5528 #define RMESCAPE_GROW 0x8 /* Grow strings instead of stalloc */
5529 #define RMESCAPE_HEAP 0x10 /* Malloc strings instead of stalloc */
5532 * Structure specifying which parts of the string should be searched
5533 * for IFS characters.
5536 struct ifsregion *next; /* next region in list */
5537 int begoff; /* offset of start of region */
5538 int endoff; /* offset of end of region */
5539 int nulonly; /* search for nul bytes only */
5543 struct strlist *list;
5544 struct strlist **lastp;
5547 /* output of current string */
5548 static char *expdest;
5549 /* list of back quote expressions */
5550 static struct nodelist *argbackq;
5551 /* first struct in list of ifs regions */
5552 static struct ifsregion ifsfirst;
5553 /* last struct in list */
5554 static struct ifsregion *ifslastp;
5555 /* holds expanded arg list */
5556 static struct arglist exparg;
5561 #if !ENABLE_SH_MATH_SUPPORT
5562 /* cvtnum() is used even if math support is off (to prepare $? values and such) */
5563 typedef long arith_t;
5564 # define ARITH_FMT "%ld"
5571 expdest = makestrspace(32, expdest);
5572 len = fmtstr(expdest, 32, ARITH_FMT, num);
5573 STADJUST(len, expdest);
5578 esclen(const char *start, const char *p)
5582 while (p > start && (unsigned char)*--p == CTLESC) {
5589 * Remove any CTLESC characters from a string.
5592 rmescapes(char *str, int flag)
5594 static const char qchars[] ALIGN1 = { CTLESC, CTLQUOTEMARK, '\0' };
5598 unsigned protect_against_glob;
5601 p = strpbrk(str, qchars);
5607 if (flag & RMESCAPE_ALLOC) {
5608 size_t len = p - str;
5609 size_t fulllen = len + strlen(p) + 1;
5611 if (flag & RMESCAPE_GROW) {
5612 int strloc = str - (char *)stackblock();
5613 r = makestrspace(fulllen, expdest);
5614 /* p and str may be invalidated by makestrspace */
5615 str = (char *)stackblock() + strloc;
5617 } else if (flag & RMESCAPE_HEAP) {
5618 r = ckmalloc(fulllen);
5620 r = stalloc(fulllen);
5624 q = (char *)memcpy(q, str, len) + len;
5628 inquotes = (flag & RMESCAPE_QUOTED) ^ RMESCAPE_QUOTED;
5629 globbing = flag & RMESCAPE_GLOB;
5630 protect_against_glob = globbing;
5632 if ((unsigned char)*p == CTLQUOTEMARK) {
5633 // TODO: if no RMESCAPE_QUOTED in flags, inquotes never becomes 0
5634 // (alternates between RMESCAPE_QUOTED and ~RMESCAPE_QUOTED). Is it ok?
5635 // Note: both inquotes and protect_against_glob only affect whether
5636 // CTLESC,<ch> gets converted to <ch> or to \<ch>
5637 inquotes = ~inquotes;
5639 protect_against_glob = globbing;
5643 /* naked back slash */
5644 protect_against_glob = 0;
5647 if ((unsigned char)*p == CTLESC) {
5649 if (protect_against_glob && inquotes && *p != '/') {
5653 protect_against_glob = globbing;
5658 if (flag & RMESCAPE_GROW) {
5660 STADJUST(q - r + 1, expdest);
5664 #define pmatch(a, b) !fnmatch((a), (b), 0)
5667 * Prepare a pattern for a expmeta (internal glob(3)) call.
5669 * Returns an stalloced string.
5672 preglob(const char *pattern, int quoted, int flag)
5674 flag |= RMESCAPE_GLOB;
5676 flag |= RMESCAPE_QUOTED;
5678 return rmescapes((char *)pattern, flag);
5682 * Put a string on the stack.
5685 memtodest(const char *p, size_t len, int syntax, int quotes)
5689 q = makestrspace(quotes ? len * 2 : len, q);
5692 unsigned char c = *p++;
5696 int n = SIT(c, syntax);
5697 if (n == CCTL || n == CBACK)
5707 strtodest(const char *p, int syntax, int quotes)
5709 memtodest(p, strlen(p), syntax, quotes);
5713 * Record the fact that we have to scan this region of the
5714 * string for IFS characters.
5717 recordregion(int start, int end, int nulonly)
5719 struct ifsregion *ifsp;
5721 if (ifslastp == NULL) {
5725 ifsp = ckzalloc(sizeof(*ifsp));
5726 /*ifsp->next = NULL; - ckzalloc did it */
5727 ifslastp->next = ifsp;
5731 ifslastp->begoff = start;
5732 ifslastp->endoff = end;
5733 ifslastp->nulonly = nulonly;
5737 removerecordregions(int endoff)
5739 if (ifslastp == NULL)
5742 if (ifsfirst.endoff > endoff) {
5743 while (ifsfirst.next) {
5744 struct ifsregion *ifsp;
5746 ifsp = ifsfirst.next->next;
5747 free(ifsfirst.next);
5748 ifsfirst.next = ifsp;
5751 if (ifsfirst.begoff > endoff) {
5754 ifslastp = &ifsfirst;
5755 ifsfirst.endoff = endoff;
5760 ifslastp = &ifsfirst;
5761 while (ifslastp->next && ifslastp->next->begoff < endoff)
5762 ifslastp = ifslastp->next;
5763 while (ifslastp->next) {
5764 struct ifsregion *ifsp;
5766 ifsp = ifslastp->next->next;
5767 free(ifslastp->next);
5768 ifslastp->next = ifsp;
5771 if (ifslastp->endoff > endoff)
5772 ifslastp->endoff = endoff;
5776 exptilde(char *startp, char *p, int flags)
5782 int quotes = flags & (EXP_FULL | EXP_CASE | EXP_REDIR);
5787 while ((c = *++p) != '\0') {
5794 if (flags & EXP_VARTILDE)
5804 if (*name == '\0') {
5805 home = lookupvar("HOME");
5807 pw = getpwnam(name);
5812 if (!home || !*home)
5815 startloc = expdest - (char *)stackblock();
5816 strtodest(home, SQSYNTAX, quotes);
5817 recordregion(startloc, expdest - (char *)stackblock(), 0);
5825 * Execute a command inside back quotes. If it's a builtin command, we
5826 * want to save its output in a block obtained from malloc. Otherwise
5827 * we fork off a subprocess and get the output of the command via a pipe.
5828 * Should be called with interrupts off.
5830 struct backcmd { /* result of evalbackcmd */
5831 int fd; /* file descriptor to read from */
5832 int nleft; /* number of chars in buffer */
5833 char *buf; /* buffer */
5834 struct job *jp; /* job structure for command */
5837 /* These forward decls are needed to use "eval" code for backticks handling: */
5838 static uint8_t back_exitstatus; /* exit status of backquoted command */
5839 #define EV_EXIT 01 /* exit after evaluating tree */
5840 static void evaltree(union node *, int);
5842 static void FAST_FUNC
5843 evalbackcmd(union node *n, struct backcmd *result)
5854 saveherefd = herefd;
5862 ash_msg_and_raise_error("pipe call failed");
5863 jp = makejob(/*n,*/ 1);
5864 if (forkshell(jp, n, FORK_NOJOB) == 0) {
5869 copyfd(pip[1], 1 | COPYFD_EXACT);
5873 evaltree(n, EV_EXIT); /* actually evaltreenr... */
5877 result->fd = pip[0];
5880 herefd = saveherefd;
5882 TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n",
5883 result->fd, result->buf, result->nleft, result->jp));
5887 * Expand stuff in backwards quotes.
5890 expbackq(union node *cmd, int quoted, int quotes)
5898 int syntax = quoted ? DQSYNTAX : BASESYNTAX;
5899 struct stackmark smark;
5902 setstackmark(&smark);
5904 startloc = dest - (char *)stackblock();
5906 evalbackcmd(cmd, &in);
5907 popstackmark(&smark);
5914 memtodest(p, i, syntax, quotes);
5918 i = nonblock_immune_read(in.fd, buf, sizeof(buf), /*loop_on_EINTR:*/ 1);
5919 TRACE(("expbackq: read returns %d\n", i));
5928 back_exitstatus = waitforjob(in.jp);
5932 /* Eat all trailing newlines */
5934 for (; dest > (char *)stackblock() && dest[-1] == '\n';)
5939 recordregion(startloc, dest - (char *)stackblock(), 0);
5940 TRACE(("evalbackq: size:%d:'%.*s'\n",
5941 (int)((dest - (char *)stackblock()) - startloc),
5942 (int)((dest - (char *)stackblock()) - startloc),
5943 stackblock() + startloc));
5946 #if ENABLE_SH_MATH_SUPPORT
5948 * Expand arithmetic expression. Backup to start of expression,
5949 * evaluate, place result in (backed up) result, adjust string position.
5962 * This routine is slightly over-complicated for
5963 * efficiency. Next we scan backwards looking for the
5964 * start of arithmetic.
5966 start = stackblock();
5973 while ((unsigned char)*p != CTLARI) {
5977 ash_msg_and_raise_error("missing CTLARI (shouldn't happen)");
5982 esc = esclen(start, p);
5992 removerecordregions(begoff);
5999 rmescapes(p + 2, 0);
6001 len = cvtnum(ash_arith(p + 2));
6004 recordregion(begoff, begoff + len, 0);
6008 /* argstr needs it */
6009 static char *evalvar(char *p, int flags, struct strlist *var_str_list);
6012 * Perform variable and command substitution. If EXP_FULL is set, output CTLESC
6013 * characters to allow for further processing. Otherwise treat
6014 * $@ like $* since no splitting will be performed.
6016 * var_str_list (can be NULL) is a list of "VAR=val" strings which take precedence
6017 * over shell varables. Needed for "A=a B=$A; echo $B" case - we use it
6018 * for correct expansion of "B=$A" word.
6021 argstr(char *p, int flags, struct strlist *var_str_list)
6023 static const char spclchars[] ALIGN1 = {
6031 CTLBACKQ | CTLQUOTE,
6032 #if ENABLE_SH_MATH_SUPPORT
6037 const char *reject = spclchars;
6038 int quotes = flags & (EXP_FULL | EXP_CASE | EXP_REDIR); /* do CTLESC */
6039 int breakall = flags & EXP_WORD;
6044 if (!(flags & EXP_VARTILDE)) {
6046 } else if (flags & EXP_VARTILDE2) {
6051 if (flags & EXP_TILDE) {
6054 flags &= ~EXP_TILDE;
6057 if ((unsigned char)*q == CTLESC && (flags & EXP_QWORD))
6060 p = exptilde(p, q, flags);
6063 startloc = expdest - (char *)stackblock();
6067 length += strcspn(p + length, reject);
6071 IF_SH_MATH_SUPPORT(|| c == CTLENDARI)
6073 /* c == '=' || c == ':' || c == CTLENDARI */
6079 expdest = stack_nputstr(p, length, expdest);
6080 newloc = expdest - (char *)stackblock();
6081 if (breakall && !inquotes && newloc > startloc) {
6082 recordregion(startloc, newloc, 0);
6093 if (flags & EXP_VARTILDE2) {
6097 flags |= EXP_VARTILDE2;
6102 * sort of a hack - expand tildes in variable
6103 * assignments (after the first '=' and after ':'s).
6112 case CTLENDVAR: /* ??? */
6115 /* "$@" syntax adherence hack */
6117 && memcmp(p, dolatstr, 4) == 0
6118 && ( p[4] == (char)CTLQUOTEMARK
6119 || (p[4] == (char)CTLENDVAR && p[5] == (char)CTLQUOTEMARK)
6122 p = evalvar(p + 1, flags, /* var_str_list: */ NULL) + 1;
6125 inquotes = !inquotes;
6138 TRACE(("argstr: evalvar('%s')\n", p));
6139 p = evalvar(p, flags, var_str_list);
6140 TRACE(("argstr: evalvar:'%s'\n", (char *)stackblock()));
6144 case CTLBACKQ|CTLQUOTE:
6145 expbackq(argbackq->n, c, quotes);
6146 argbackq = argbackq->next;
6148 #if ENABLE_SH_MATH_SUPPORT
6160 scanleft(char *startp, char *rmesc, char *rmescend UNUSED_PARAM,
6161 char *pattern, int quotes, int zero)
6170 const char *s = loc2;
6177 match = pmatch(pattern, s);
6182 if (quotes && (unsigned char)*loc == CTLESC)
6191 scanright(char *startp, char *rmesc, char *rmescend,
6192 char *pattern, int quotes, int match_at_start)
6194 #if !ENABLE_ASH_OPTIMIZE_FOR_SIZE
6195 int try2optimize = match_at_start;
6201 /* If we called by "${v/pattern/repl}" or "${v//pattern/repl}":
6202 * startp="escaped_value_of_v" rmesc="raw_value_of_v"
6203 * rmescend=""(ptr to NUL in rmesc) pattern="pattern" quotes=match_at_start=1
6205 * loc starts at NUL at the end of startp, loc2 starts at the end of rmesc,
6206 * and on each iteration they go back two/one char until they reach the beginning.
6207 * We try to find a match in "raw_value_of_v", "raw_value_of_", "raw_value_of" etc.
6209 /* TODO: document in what other circumstances we are called. */
6211 for (loc = pattern - 1, loc2 = rmescend; loc >= startp; loc2--) {
6214 const char *s = loc2;
6215 if (match_at_start) {
6219 match = pmatch(pattern, s);
6220 //bb_error_msg("pmatch(pattern:'%s',s:'%s'):%d", pattern, s, match);
6224 #if !ENABLE_ASH_OPTIMIZE_FOR_SIZE
6226 /* Maybe we can optimize this:
6227 * if pattern ends with unescaped *, we can avoid checking
6228 * shorter strings: if "foo*" doesnt match "raw_value_of_v",
6229 * it wont match truncated "raw_value_of_" strings too.
6231 unsigned plen = strlen(pattern);
6232 /* Does it end with "*"? */
6233 if (plen != 0 && pattern[--plen] == '*') {
6234 /* "xxxx*" is not escaped */
6235 /* "xxx\*" is escaped */
6236 /* "xx\\*" is not escaped */
6237 /* "x\\\*" is escaped */
6239 while (plen != 0 && pattern[--plen] == '\\')
6242 break; /* ends with unescaped "*" */
6250 esc = esclen(startp, loc);
6261 static void varunset(const char *, const char *, const char *, int) NORETURN;
6263 varunset(const char *end, const char *var, const char *umsg, int varflags)
6269 msg = "parameter not set";
6271 if ((unsigned char)*end == CTLENDVAR) {
6272 if (varflags & VSNUL)
6278 ash_msg_and_raise_error("%.*s: %s%s", (int)(end - var - 1), var, msg, tail);
6281 #if ENABLE_ASH_BASH_COMPAT
6283 parse_sub_pattern(char *arg, int varflags)
6285 char *idx, *repl = NULL;
6288 //char *org_arg = arg;
6289 //bb_error_msg("arg:'%s' varflags:%x", arg, varflags);
6296 /* Only the first '/' seen is our separator */
6305 * Example: v='ab\c'; echo ${v/\\b/_\\_\z_}
6306 * The result is a_\_z_c (not a\_\_z_c)!
6308 * Enable debug prints in this function and you'll see:
6309 * ash: arg:'\\b/_\\_z_' varflags:d
6310 * ash: pattern:'\\b' repl:'_\_z_'
6311 * That is, \\b is interpreted as \\b, but \\_ as \_!
6312 * IOW: search pattern and replace string treat backslashes
6313 * differently! That is the reason why we check repl below:
6315 if (c == '\\' && *arg == '\\' && repl && !(varflags & VSQUOTE))
6316 arg++; /* skip both '\', not just first one */
6319 //bb_error_msg("pattern:'%s' repl:'%s'", org_arg, repl);
6323 #endif /* ENABLE_ASH_BASH_COMPAT */
6326 subevalvar(char *p, char *varname, int strloc, int subtype,
6327 int startloc, int varflags, int quotes, struct strlist *var_str_list)
6329 struct nodelist *saveargbackq = argbackq;
6332 char *rmesc, *rmescend;
6334 IF_ASH_BASH_COMPAT(const char *repl = NULL;)
6335 IF_ASH_BASH_COMPAT(int pos, len, orig_len;)
6336 int saveherefd = herefd;
6337 int amount, workloc, resetloc;
6339 char *(*scan)(char*, char*, char*, char*, int, int);
6341 //bb_error_msg("subevalvar(p:'%s',varname:'%s',strloc:%d,subtype:%d,startloc:%d,varflags:%x,quotes:%d)",
6342 // p, varname, strloc, subtype, startloc, varflags, quotes);
6345 argstr(p, (subtype != VSASSIGN && subtype != VSQUESTION) ? EXP_CASE : 0,
6347 STPUTC('\0', expdest);
6348 herefd = saveherefd;
6349 argbackq = saveargbackq;
6350 startp = (char *)stackblock() + startloc;
6354 setvar(varname, startp, 0);
6355 amount = startp - expdest;
6356 STADJUST(amount, expdest);
6360 varunset(p, varname, startp, varflags);
6363 #if ENABLE_ASH_BASH_COMPAT
6365 loc = str = stackblock() + strloc;
6366 /* Read POS in ${var:POS:LEN} */
6367 pos = atoi(loc); /* number(loc) errors out on "1:4" */
6368 len = str - startp - 1;
6370 /* *loc != '\0', guaranteed by parser */
6374 /* Adjust the length by the number of escapes */
6375 for (ptr = startp; ptr < (str - 1); ptr++) {
6376 if ((unsigned char)*ptr == CTLESC) {
6384 if (*loc++ == ':') {
6388 /* Skip POS in ${var:POS:LEN} */
6390 while (*loc && *loc != ':') {
6392 * bash complains on: var=qwe; echo ${var:1a:123}
6394 ash_msg_and_raise_error(msg_illnum, str);
6398 if (*loc++ == ':') {
6402 if (pos >= orig_len) {
6406 if (len > (orig_len - pos))
6407 len = orig_len - pos;
6409 for (str = startp; pos; str++, pos--) {
6410 if (quotes && (unsigned char)*str == CTLESC)
6413 for (loc = startp; len; len--) {
6414 if (quotes && (unsigned char)*str == CTLESC)
6419 amount = loc - expdest;
6420 STADJUST(amount, expdest);
6425 resetloc = expdest - (char *)stackblock();
6427 /* We'll comeback here if we grow the stack while handling
6428 * a VSREPLACE or VSREPLACEALL, since our pointers into the
6429 * stack will need rebasing, and we'll need to remove our work
6432 IF_ASH_BASH_COMPAT(restart:)
6434 amount = expdest - ((char *)stackblock() + resetloc);
6435 STADJUST(-amount, expdest);
6436 startp = (char *)stackblock() + startloc;
6439 rmescend = (char *)stackblock() + strloc;
6441 rmesc = rmescapes(startp, RMESCAPE_ALLOC | RMESCAPE_GROW);
6442 if (rmesc != startp) {
6444 startp = (char *)stackblock() + startloc;
6448 str = (char *)stackblock() + strloc;
6449 preglob(str, varflags & VSQUOTE, 0);
6450 workloc = expdest - (char *)stackblock();
6452 #if ENABLE_ASH_BASH_COMPAT
6453 if (subtype == VSREPLACE || subtype == VSREPLACEALL) {
6457 repl = parse_sub_pattern(str, varflags);
6458 //bb_error_msg("repl:'%s'", repl);
6463 /* If there's no pattern to match, return the expansion unmolested */
6472 loc = scanright(idx, rmesc, rmescend, str, quotes, 1);
6473 //bb_error_msg("scanright('%s'):'%s'", str, loc);
6475 /* No match, advance */
6476 char *restart_detect = stackblock();
6478 STPUTC(*idx, expdest);
6479 if (quotes && (unsigned char)*idx == CTLESC) {
6482 STPUTC(*idx, expdest);
6484 if (stackblock() != restart_detect)
6489 /* continue; - prone to quadratic behavior, smarter code: */
6492 if (str[0] == '*') {
6493 /* Pattern is "*foo". If "*foo" does not match "long_string",
6494 * it would never match "ong_string" etc, no point in trying.
6501 if (subtype == VSREPLACEALL) {
6503 if (quotes && (unsigned char)*idx == CTLESC)
6512 //bb_error_msg("repl:'%s'", repl);
6513 for (loc = (char*)repl; *loc; loc++) {
6514 char *restart_detect = stackblock();
6515 if (quotes && *loc == '\\') {
6516 STPUTC(CTLESC, expdest);
6519 STPUTC(*loc, expdest);
6520 if (stackblock() != restart_detect)
6525 if (subtype == VSREPLACE) {
6526 //bb_error_msg("tail:'%s', quotes:%x", idx, quotes);
6528 char *restart_detect = stackblock();
6529 STPUTC(*idx, expdest);
6530 if (stackblock() != restart_detect)
6539 /* We've put the replaced text into a buffer at workloc, now
6540 * move it to the right place and adjust the stack.
6542 STPUTC('\0', expdest);
6543 startp = (char *)stackblock() + startloc;
6544 memmove(startp, (char *)stackblock() + workloc, len + 1);
6545 //bb_error_msg("startp:'%s'", startp);
6546 amount = expdest - (startp + len);
6547 STADJUST(-amount, expdest);
6550 #endif /* ENABLE_ASH_BASH_COMPAT */
6552 subtype -= VSTRIMRIGHT;
6554 if (subtype < 0 || subtype > 7)
6557 /* zero = (subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX) */
6558 zero = subtype >> 1;
6559 /* VSTRIMLEFT/VSTRIMRIGHTMAX -> scanleft */
6560 scan = (subtype & 1) ^ zero ? scanleft : scanright;
6562 loc = scan(startp, rmesc, rmescend, str, quotes, zero);
6565 memmove(startp, loc, str - loc);
6566 loc = startp + (str - loc) - 1;
6569 amount = loc - expdest;
6570 STADJUST(amount, expdest);
6576 * Add the value of a specialized variable to the stack string.
6577 * name parameter (examples):
6578 * ash -c 'echo $1' name:'1='
6579 * ash -c 'echo $qwe' name:'qwe='
6580 * ash -c 'echo $$' name:'$='
6581 * ash -c 'echo ${$}' name:'$='
6582 * ash -c 'echo ${$##q}' name:'$=q'
6583 * ash -c 'echo ${#$}' name:'$='
6584 * note: examples with bad shell syntax:
6585 * ash -c 'echo ${#$1}' name:'$=1'
6586 * ash -c 'echo ${#1#}' name:'1=#'
6588 static NOINLINE ssize_t
6589 varvalue(char *name, int varflags, int flags, struct strlist *var_str_list)
6596 int subtype = varflags & VSTYPE;
6597 int quotes = flags & (EXP_FULL | EXP_CASE | EXP_REDIR);
6598 int quoted = varflags & VSQUOTE;
6599 int syntax = quoted ? DQSYNTAX : BASESYNTAX;
6609 num = shellparam.nparam;
6617 goto check_1char_name;
6619 expdest = makestrspace(NOPTS, expdest);
6620 for (i = NOPTS - 1; i >= 0; i--) {
6622 USTPUTC(optletters(i), expdest);
6628 /* handles cases similar to ${#$1} */
6629 if (name[2] != '\0')
6630 raise_error_syntax("bad substitution");
6637 if (quoted && (flags & EXP_FULL)) {
6638 /* note: this is not meant as PEOF value */
6639 sep = 1 << CHAR_BIT;
6644 sep = ifsset() ? (unsigned char)(ifsval()[0]) : ' ';
6645 i = SIT(sep, syntax);
6646 if (quotes && (i == CCTL || i == CBACK))
6652 while ((p = *ap++) != NULL) {
6655 partlen = strlen(p);
6658 if (!(subtype == VSPLUS || subtype == VSLENGTH))
6659 memtodest(p, partlen, syntax, quotes);
6665 if (subtype == VSPLUS || subtype == VSLENGTH) {
6671 /* note: may put NUL despite sep != 0
6672 * (see sep = 1 << CHAR_BIT above) */
6678 } /* case '@' and '*' */
6689 num = atoi(name); /* number(name) fails on ${N#str} etc */
6690 if (num < 0 || num > shellparam.nparam)
6692 p = num ? shellparam.p[num - 1] : arg0;
6695 /* NB: name has form "VAR=..." */
6697 /* "A=a B=$A" case: var_str_list is a list of "A=a" strings
6698 * which should be considered before we check variables. */
6700 unsigned name_len = (strchrnul(name, '=') - name) + 1;
6704 str = var_str_list->text;
6705 eq = strchr(str, '=');
6706 if (!eq) /* stop at first non-assignment */
6709 if (name_len == (unsigned)(eq - str)
6710 && strncmp(str, name, name_len) == 0
6713 /* goto value; - WRONG! */
6714 /* think "A=1 A=2 B=$A" */
6716 var_str_list = var_str_list->next;
6717 } while (var_str_list);
6721 p = lookupvar(name);
6727 if (!(subtype == VSPLUS || subtype == VSLENGTH))
6728 memtodest(p, len, syntax, quotes);
6732 if (subtype == VSPLUS || subtype == VSLENGTH)
6733 STADJUST(-len, expdest);
6738 * Expand a variable, and return a pointer to the next character in the
6742 evalvar(char *p, int flags, struct strlist *var_str_list)
6753 varflags = (unsigned char) *p++;
6754 subtype = varflags & VSTYPE;
6755 quoted = varflags & VSQUOTE;
6757 easy = (!quoted || (*var == '@' && shellparam.nparam));
6758 startloc = expdest - (char *)stackblock();
6759 p = strchr(p, '=') + 1; //TODO: use var_end(p)?
6762 varlen = varvalue(var, varflags, flags, var_str_list);
6763 if (varflags & VSNUL)
6766 if (subtype == VSPLUS) {
6767 varlen = -1 - varlen;
6771 if (subtype == VSMINUS) {
6776 flags | (quoted ? EXP_TILDE|EXP_QWORD : EXP_TILDE|EXP_WORD),
6786 if (subtype == VSASSIGN || subtype == VSQUESTION) {
6788 if (subevalvar(p, var, /* strloc: */ 0,
6789 subtype, startloc, varflags,
6795 * Remove any recorded regions beyond
6798 removerecordregions(startloc);
6808 if (varlen < 0 && uflag)
6809 varunset(p, var, 0, 0);
6811 if (subtype == VSLENGTH) {
6812 cvtnum(varlen > 0 ? varlen : 0);
6816 if (subtype == VSNORMAL) {
6827 case VSTRIMRIGHTMAX:
6828 #if ENABLE_ASH_BASH_COMPAT
6841 * Terminate the string and start recording the pattern
6844 STPUTC('\0', expdest);
6845 patloc = expdest - (char *)stackblock();
6846 if (NULL == subevalvar(p, /* varname: */ NULL, patloc, subtype,
6848 /* quotes: */ flags & (EXP_FULL | EXP_CASE | EXP_REDIR),
6851 int amount = expdest - (
6852 (char *)stackblock() + patloc - 1
6854 STADJUST(-amount, expdest);
6856 /* Remove any recorded regions beyond start of variable */
6857 removerecordregions(startloc);
6859 recordregion(startloc, expdest - (char *)stackblock(), quoted);
6863 if (subtype != VSNORMAL) { /* skip to end of alternative */
6866 unsigned char c = *p++;
6869 else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) {
6871 argbackq = argbackq->next;
6872 } else if (c == CTLVAR) {
6873 if ((*p++ & VSTYPE) != VSNORMAL)
6875 } else if (c == CTLENDVAR) {
6885 * Break the argument string into pieces based upon IFS and add the
6886 * strings to the argument list. The regions of the string to be
6887 * searched for IFS characters have been stored by recordregion.
6890 ifsbreakup(char *string, struct arglist *arglist)
6892 struct ifsregion *ifsp;
6897 const char *ifs, *realifs;
6902 if (ifslastp != NULL) {
6905 realifs = ifsset() ? ifsval() : defifs;
6908 p = string + ifsp->begoff;
6909 nulonly = ifsp->nulonly;
6910 ifs = nulonly ? nullstr : realifs;
6912 while (p < string + ifsp->endoff) {
6914 if ((unsigned char)*p == CTLESC)
6916 if (!strchr(ifs, *p)) {
6921 ifsspc = (strchr(defifs, *p) != NULL);
6922 /* Ignore IFS whitespace at start */
6923 if (q == start && ifsspc) {
6929 sp = stzalloc(sizeof(*sp));
6931 *arglist->lastp = sp;
6932 arglist->lastp = &sp->next;
6936 if (p >= string + ifsp->endoff) {
6940 if ((unsigned char)*p == CTLESC)
6942 if (strchr(ifs, *p) == NULL) {
6946 if (strchr(defifs, *p) == NULL) {
6961 } while (ifsp != NULL);
6970 sp = stzalloc(sizeof(*sp));
6972 *arglist->lastp = sp;
6973 arglist->lastp = &sp->next;
6979 struct ifsregion *p;
6984 struct ifsregion *ifsp;
6990 ifsfirst.next = NULL;
6995 * Add a file name to the list.
6998 addfname(const char *name)
7002 sp = stzalloc(sizeof(*sp));
7003 sp->text = ststrdup(name);
7005 exparg.lastp = &sp->next;
7009 * Do metacharacter (i.e. *, ?, [...]) expansion.
7012 expmeta(char *expdir, char *enddir, char *name)
7027 for (p = name; *p; p++) {
7028 if (*p == '*' || *p == '?')
7030 else if (*p == '[') {
7037 if (*q == '/' || *q == '\0')
7044 } else if (*p == '\\')
7046 else if (*p == '/') {
7053 if (metaflag == 0) { /* we've reached the end of the file name */
7054 if (enddir != expdir)
7062 if (metaflag == 0 || lstat(expdir, &statb) >= 0)
7073 } while (p < start);
7075 if (enddir == expdir) {
7077 } else if (enddir == expdir + 1 && *expdir == '/') {
7086 if (enddir != expdir)
7088 if (*endname == 0) {
7100 while (!pending_int && (dp = readdir(dirp)) != NULL) {
7101 if (dp->d_name[0] == '.' && !matchdot)
7103 if (pmatch(start, dp->d_name)) {
7105 strcpy(enddir, dp->d_name);
7108 for (p = enddir, cp = dp->d_name; (*p++ = *cp++) != '\0';)
7111 expmeta(expdir, p, endname);
7120 static struct strlist *
7121 msort(struct strlist *list, int len)
7123 struct strlist *p, *q = NULL;
7124 struct strlist **lpp;
7132 for (n = half; --n >= 0;) {
7136 q->next = NULL; /* terminate first half of list */
7137 q = msort(list, half); /* sort first half of list */
7138 p = msort(p, len - half); /* sort second half */
7141 #if ENABLE_LOCALE_SUPPORT
7142 if (strcoll(p->text, q->text) < 0)
7144 if (strcmp(p->text, q->text) < 0)
7168 * Sort the results of file name expansion. It calculates the number of
7169 * strings to sort and then calls msort (short for merge sort) to do the
7172 static struct strlist *
7173 expsort(struct strlist *str)
7179 for (sp = str; sp; sp = sp->next)
7181 return msort(str, len);
7185 expandmeta(struct strlist *str /*, int flag*/)
7187 static const char metachars[] ALIGN1 = {
7190 /* TODO - EXP_REDIR */
7194 struct strlist **savelastp;
7200 if (!strpbrk(str->text, metachars))
7202 savelastp = exparg.lastp;
7205 p = preglob(str->text, 0, RMESCAPE_ALLOC | RMESCAPE_HEAP);
7207 int i = strlen(str->text);
7208 expdir = ckmalloc(i < 2048 ? 2048 : i); /* XXX */
7210 expmeta(expdir, expdir, p);
7215 if (exparg.lastp == savelastp) {
7220 *exparg.lastp = str;
7221 rmescapes(str->text, 0);
7222 exparg.lastp = &str->next;
7224 *exparg.lastp = NULL;
7225 *savelastp = sp = expsort(*savelastp);
7226 while (sp->next != NULL)
7228 exparg.lastp = &sp->next;
7235 * Perform variable substitution and command substitution on an argument,
7236 * placing the resulting list of arguments in arglist. If EXP_FULL is true,
7237 * perform splitting and file name expansion. When arglist is NULL, perform
7238 * here document expansion.
7241 expandarg(union node *arg, struct arglist *arglist, int flag)
7246 argbackq = arg->narg.backquote;
7247 STARTSTACKSTR(expdest);
7248 ifsfirst.next = NULL;
7250 TRACE(("expandarg: argstr('%s',flags:%x)\n", arg->narg.text, flag));
7251 argstr(arg->narg.text, flag,
7252 /* var_str_list: */ arglist ? arglist->list : NULL);
7253 p = _STPUTC('\0', expdest);
7255 if (arglist == NULL) {
7256 return; /* here document expanded */
7258 p = grabstackstr(p);
7259 TRACE(("expandarg: p:'%s'\n", p));
7260 exparg.lastp = &exparg.list;
7264 if (flag & EXP_FULL) {
7265 ifsbreakup(p, &exparg);
7266 *exparg.lastp = NULL;
7267 exparg.lastp = &exparg.list;
7268 expandmeta(exparg.list /*, flag*/);
7270 if (flag & EXP_REDIR) { /*XXX - for now, just remove escapes */
7272 TRACE(("expandarg: rmescapes:'%s'\n", p));
7274 sp = stzalloc(sizeof(*sp));
7277 exparg.lastp = &sp->next;
7281 *exparg.lastp = NULL;
7283 *arglist->lastp = exparg.list;
7284 arglist->lastp = exparg.lastp;
7289 * Expand shell variables and backquotes inside a here document.
7292 expandhere(union node *arg, int fd)
7295 expandarg(arg, (struct arglist *)NULL, 0);
7296 full_write(fd, stackblock(), expdest - (char *)stackblock());
7300 * Returns true if the pattern matches the string.
7303 patmatch(char *pattern, const char *string)
7305 return pmatch(preglob(pattern, 0, 0), string);
7309 * See if a pattern matches in a case statement.
7312 casematch(union node *pattern, char *val)
7314 struct stackmark smark;
7317 setstackmark(&smark);
7318 argbackq = pattern->narg.backquote;
7319 STARTSTACKSTR(expdest);
7321 argstr(pattern->narg.text, EXP_TILDE | EXP_CASE,
7322 /* var_str_list: */ NULL);
7323 STACKSTRNUL(expdest);
7324 result = patmatch(stackblock(), val);
7325 popstackmark(&smark);
7330 /* ============ find_command */
7334 int (*builtin)(int, char **) FAST_FUNC;
7335 /* unsigned flags; */
7337 #define IS_BUILTIN_SPECIAL(b) ((b)->name[0] & 1)
7338 /* "regular" builtins always take precedence over commands,
7339 * regardless of PATH=....%builtin... position */
7340 #define IS_BUILTIN_REGULAR(b) ((b)->name[0] & 2)
7341 #define IS_BUILTIN_ASSIGN(b) ((b)->name[0] & 4)
7344 smallint cmdtype; /* CMDxxx */
7347 /* index >= 0 for commands without path (slashes) */
7348 /* (TODO: what exactly does the value mean? PATH position?) */
7349 /* index == -1 for commands with slashes */
7350 /* index == (-2 - applet_no) for NOFORK applets */
7351 const struct builtincmd *cmd;
7352 struct funcnode *func;
7355 /* values of cmdtype */
7356 #define CMDUNKNOWN -1 /* no entry in table for command */
7357 #define CMDNORMAL 0 /* command is an executable program */
7358 #define CMDFUNCTION 1 /* command is a shell function */
7359 #define CMDBUILTIN 2 /* command is a shell builtin */
7361 /* action to find_command() */
7362 #define DO_ERR 0x01 /* prints errors */
7363 #define DO_ABS 0x02 /* checks absolute paths */
7364 #define DO_NOFUNC 0x04 /* don't return shell functions, for command */
7365 #define DO_ALTPATH 0x08 /* using alternate path */
7366 #define DO_ALTBLTIN 0x20 /* %builtin in alt. path */
7368 static void find_command(char *, struct cmdentry *, int, const char *);
7371 /* ============ Hashing commands */
7374 * When commands are first encountered, they are entered in a hash table.
7375 * This ensures that a full path search will not have to be done for them
7376 * on each invocation.
7378 * We should investigate converting to a linear search, even though that
7379 * would make the command name "hash" a misnomer.
7383 struct tblentry *next; /* next entry in hash chain */
7384 union param param; /* definition of builtin function */
7385 smallint cmdtype; /* CMDxxx */
7386 char rehash; /* if set, cd done since entry created */
7387 char cmdname[1]; /* name of command */
7390 static struct tblentry **cmdtable;
7391 #define INIT_G_cmdtable() do { \
7392 cmdtable = xzalloc(CMDTABLESIZE * sizeof(cmdtable[0])); \
7395 static int builtinloc = -1; /* index in path of %builtin, or -1 */
7399 tryexec(IF_FEATURE_SH_STANDALONE(int applet_no,) char *cmd, char **argv, char **envp)
7401 #if ENABLE_FEATURE_SH_STANDALONE
7402 if (applet_no >= 0) {
7403 if (APPLET_IS_NOEXEC(applet_no)) {
7407 run_applet_no_and_exit(applet_no, argv);
7409 /* re-exec ourselves with the new arguments */
7410 execve(bb_busybox_exec_path, argv, envp);
7411 /* If they called chroot or otherwise made the binary no longer
7412 * executable, fall through */
7419 execve(cmd, argv, envp);
7420 } while (errno == EINTR);
7422 execve(cmd, argv, envp);
7424 if (cmd == (char*) bb_busybox_exec_path) {
7425 /* We already visited ENOEXEC branch below, don't do it again */
7426 //TODO: try execve(initial_argv0_of_shell, argv, envp) before giving up?
7430 if (errno == ENOEXEC) {
7431 /* Run "cmd" as a shell script:
7432 * http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html
7433 * "If the execve() function fails with ENOEXEC, the shell
7434 * shall execute a command equivalent to having a shell invoked
7435 * with the command name as its first operand,
7436 * with any remaining arguments passed to the new shell"
7438 * That is, do not use $SHELL, user's shell, or /bin/sh;
7439 * just call ourselves.
7441 * Note that bash reads ~80 chars of the file, and if it sees
7442 * a zero byte before it sees newline, it doesn't try to
7443 * interpret it, but fails with "cannot execute binary file"
7444 * message and exit code 126. For one, this prevents attempts
7445 * to interpret foreign ELF binaries as shell scripts.
7450 for (ap = argv; *ap; ap++)
7452 new = ckmalloc((ap - argv + 2) * sizeof(new[0]));
7453 new[0] = (char*) "ash";
7456 while ((*ap++ = *++argv) != NULL)
7458 cmd = (char*) bb_busybox_exec_path;
7465 * Exec a program. Never returns. If you change this routine, you may
7466 * have to change the find_command routine as well.
7468 static void shellexec(char **, const char *, int) NORETURN;
7470 shellexec(char **argv, const char *path, int idx)
7476 int applet_no = -1; /* used only by FEATURE_SH_STANDALONE */
7478 clearredir(/*drop:*/ 1);
7479 envp = listvars(VEXPORT, VUNSET, /*end:*/ NULL);
7480 if (strchr(argv[0], '/') != NULL
7481 #if ENABLE_FEATURE_SH_STANDALONE
7482 || (applet_no = find_applet_by_name(argv[0])) >= 0
7485 tryexec(IF_FEATURE_SH_STANDALONE(applet_no,) argv[0], argv, envp);
7486 if (applet_no >= 0) {
7487 /* We tried execing ourself, but it didn't work.
7488 * Maybe /proc/self/exe doesn't exist?
7497 while ((cmdname = path_advance(&path, argv[0])) != NULL) {
7498 if (--idx < 0 && pathopt == NULL) {
7499 tryexec(IF_FEATURE_SH_STANDALONE(-1,) cmdname, argv, envp);
7500 if (errno != ENOENT && errno != ENOTDIR)
7507 /* Map to POSIX errors */
7519 exitstatus = exerrno;
7520 TRACE(("shellexec failed for %s, errno %d, suppress_int %d\n",
7521 argv[0], e, suppress_int));
7522 ash_msg_and_raise(EXEXEC, "%s: %s", argv[0], errmsg(e, "not found"));
7527 printentry(struct tblentry *cmdp)
7533 idx = cmdp->param.index;
7536 name = path_advance(&path, cmdp->cmdname);
7538 } while (--idx >= 0);
7539 out1fmt("%s%s\n", name, (cmdp->rehash ? "*" : nullstr));
7543 * Clear out command entries. The argument specifies the first entry in
7544 * PATH which has changed.
7547 clearcmdentry(int firstchange)
7549 struct tblentry **tblp;
7550 struct tblentry **pp;
7551 struct tblentry *cmdp;
7554 for (tblp = cmdtable; tblp < &cmdtable[CMDTABLESIZE]; tblp++) {
7556 while ((cmdp = *pp) != NULL) {
7557 if ((cmdp->cmdtype == CMDNORMAL &&
7558 cmdp->param.index >= firstchange)
7559 || (cmdp->cmdtype == CMDBUILTIN &&
7560 builtinloc >= firstchange)
7573 * Locate a command in the command hash table. If "add" is nonzero,
7574 * add the command to the table if it is not already present. The
7575 * variable "lastcmdentry" is set to point to the address of the link
7576 * pointing to the entry, so that delete_cmd_entry can delete the
7579 * Interrupts must be off if called with add != 0.
7581 static struct tblentry **lastcmdentry;
7583 static struct tblentry *
7584 cmdlookup(const char *name, int add)
7586 unsigned int hashval;
7588 struct tblentry *cmdp;
7589 struct tblentry **pp;
7592 hashval = (unsigned char)*p << 4;
7594 hashval += (unsigned char)*p++;
7596 pp = &cmdtable[hashval % CMDTABLESIZE];
7597 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7598 if (strcmp(cmdp->cmdname, name) == 0)
7602 if (add && cmdp == NULL) {
7603 cmdp = *pp = ckzalloc(sizeof(struct tblentry)
7605 /* + 1 - already done because
7606 * tblentry::cmdname is char[1] */);
7607 /*cmdp->next = NULL; - ckzalloc did it */
7608 cmdp->cmdtype = CMDUNKNOWN;
7609 strcpy(cmdp->cmdname, name);
7616 * Delete the command entry returned on the last lookup.
7619 delete_cmd_entry(void)
7621 struct tblentry *cmdp;
7624 cmdp = *lastcmdentry;
7625 *lastcmdentry = cmdp->next;
7626 if (cmdp->cmdtype == CMDFUNCTION)
7627 freefunc(cmdp->param.func);
7633 * Add a new command entry, replacing any existing command entry for
7634 * the same name - except special builtins.
7637 addcmdentry(char *name, struct cmdentry *entry)
7639 struct tblentry *cmdp;
7641 cmdp = cmdlookup(name, 1);
7642 if (cmdp->cmdtype == CMDFUNCTION) {
7643 freefunc(cmdp->param.func);
7645 cmdp->cmdtype = entry->cmdtype;
7646 cmdp->param = entry->u;
7650 static int FAST_FUNC
7651 hashcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
7653 struct tblentry **pp;
7654 struct tblentry *cmdp;
7656 struct cmdentry entry;
7659 if (nextopt("r") != '\0') {
7664 if (*argptr == NULL) {
7665 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
7666 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7667 if (cmdp->cmdtype == CMDNORMAL)
7675 while ((name = *argptr) != NULL) {
7676 cmdp = cmdlookup(name, 0);
7678 && (cmdp->cmdtype == CMDNORMAL
7679 || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))
7683 find_command(name, &entry, DO_ERR, pathval());
7684 if (entry.cmdtype == CMDUNKNOWN)
7692 * Called when a cd is done. Marks all commands so the next time they
7693 * are executed they will be rehashed.
7698 struct tblentry **pp;
7699 struct tblentry *cmdp;
7701 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
7702 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7703 if (cmdp->cmdtype == CMDNORMAL
7704 || (cmdp->cmdtype == CMDBUILTIN
7705 && !IS_BUILTIN_REGULAR(cmdp->param.cmd)
7715 * Fix command hash table when PATH changed.
7716 * Called before PATH is changed. The argument is the new value of PATH;
7717 * pathval() still returns the old value at this point.
7718 * Called with interrupts off.
7720 static void FAST_FUNC
7721 changepath(const char *new)
7729 firstchange = 9999; /* assume no change */
7735 if ((*old == '\0' && *new == ':')
7736 || (*old == ':' && *new == '\0')
7740 old = new; /* ignore subsequent differences */
7744 if (*new == '%' && idx_bltin < 0 && prefix(new + 1, "builtin"))
7751 if (builtinloc < 0 && idx_bltin >= 0)
7752 builtinloc = idx_bltin; /* zap builtins */
7753 if (builtinloc >= 0 && idx_bltin < 0)
7755 clearcmdentry(firstchange);
7756 builtinloc = idx_bltin;
7771 #define TENDBQUOTE 12
7788 typedef smallint token_id_t;
7790 /* first char is indicating which tokens mark the end of a list */
7791 static const char *const tokname_array[] = {
7805 #define KWDOFFSET 13
7806 /* the following are keywords */
7825 /* Wrapper around strcmp for qsort/bsearch/... */
7827 pstrcmp(const void *a, const void *b)
7829 return strcmp((char*) a, (*(char**) b) + 1);
7832 static const char *const *
7833 findkwd(const char *s)
7835 return bsearch(s, tokname_array + KWDOFFSET,
7836 ARRAY_SIZE(tokname_array) - KWDOFFSET,
7837 sizeof(tokname_array[0]), pstrcmp);
7841 * Locate and print what a word is...
7844 describe_command(char *command, int describe_command_verbose)
7846 struct cmdentry entry;
7847 struct tblentry *cmdp;
7848 #if ENABLE_ASH_ALIAS
7849 const struct alias *ap;
7851 const char *path = pathval();
7853 if (describe_command_verbose) {
7857 /* First look at the keywords */
7858 if (findkwd(command)) {
7859 out1str(describe_command_verbose ? " is a shell keyword" : command);
7863 #if ENABLE_ASH_ALIAS
7864 /* Then look at the aliases */
7865 ap = lookupalias(command, 0);
7867 if (!describe_command_verbose) {
7872 out1fmt(" is an alias for %s", ap->val);
7876 /* Then check if it is a tracked alias */
7877 cmdp = cmdlookup(command, 0);
7879 entry.cmdtype = cmdp->cmdtype;
7880 entry.u = cmdp->param;
7882 /* Finally use brute force */
7883 find_command(command, &entry, DO_ABS, path);
7886 switch (entry.cmdtype) {
7888 int j = entry.u.index;
7894 p = path_advance(&path, command);
7898 if (describe_command_verbose) {
7900 (cmdp ? " a tracked alias for" : nullstr), p
7909 if (describe_command_verbose) {
7910 out1str(" is a shell function");
7917 if (describe_command_verbose) {
7918 out1fmt(" is a %sshell builtin",
7919 IS_BUILTIN_SPECIAL(entry.u.cmd) ?
7920 "special " : nullstr
7928 if (describe_command_verbose) {
7929 out1str(": not found\n");
7938 static int FAST_FUNC
7939 typecmd(int argc UNUSED_PARAM, char **argv)
7945 /* type -p ... ? (we don't bother checking for 'p') */
7946 if (argv[1] && argv[1][0] == '-') {
7951 err |= describe_command(argv[i++], verbose);
7956 #if ENABLE_ASH_CMDCMD
7957 static int FAST_FUNC
7958 commandcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
7966 while ((c = nextopt("pvV")) != '\0')
7968 verify |= VERIFY_VERBOSE;
7970 verify |= VERIFY_BRIEF;
7975 /* Mimic bash: just "command -v" doesn't complain, it's a nop */
7976 if (verify && (*argptr != NULL)) {
7977 return describe_command(*argptr, verify - VERIFY_BRIEF);
7985 /* ============ eval.c */
7987 static int funcblocksize; /* size of structures in function */
7988 static int funcstringsize; /* size of strings in node */
7989 static void *funcblock; /* block to allocate function from */
7990 static char *funcstring; /* block to allocate strings from */
7992 /* flags in argument to evaltree */
7993 #define EV_EXIT 01 /* exit after evaluating tree */
7994 #define EV_TESTED 02 /* exit status is checked; ignore -e flag */
7995 #define EV_BACKCMD 04 /* command executing within back quotes */
7997 static const uint8_t nodesize[N_NUMBER] = {
7998 [NCMD ] = SHELL_ALIGN(sizeof(struct ncmd)),
7999 [NPIPE ] = SHELL_ALIGN(sizeof(struct npipe)),
8000 [NREDIR ] = SHELL_ALIGN(sizeof(struct nredir)),
8001 [NBACKGND ] = SHELL_ALIGN(sizeof(struct nredir)),
8002 [NSUBSHELL] = SHELL_ALIGN(sizeof(struct nredir)),
8003 [NAND ] = SHELL_ALIGN(sizeof(struct nbinary)),
8004 [NOR ] = SHELL_ALIGN(sizeof(struct nbinary)),
8005 [NSEMI ] = SHELL_ALIGN(sizeof(struct nbinary)),
8006 [NIF ] = SHELL_ALIGN(sizeof(struct nif)),
8007 [NWHILE ] = SHELL_ALIGN(sizeof(struct nbinary)),
8008 [NUNTIL ] = SHELL_ALIGN(sizeof(struct nbinary)),
8009 [NFOR ] = SHELL_ALIGN(sizeof(struct nfor)),
8010 [NCASE ] = SHELL_ALIGN(sizeof(struct ncase)),
8011 [NCLIST ] = SHELL_ALIGN(sizeof(struct nclist)),
8012 [NDEFUN ] = SHELL_ALIGN(sizeof(struct narg)),
8013 [NARG ] = SHELL_ALIGN(sizeof(struct narg)),
8014 [NTO ] = SHELL_ALIGN(sizeof(struct nfile)),
8015 #if ENABLE_ASH_BASH_COMPAT
8016 [NTO2 ] = SHELL_ALIGN(sizeof(struct nfile)),
8018 [NCLOBBER ] = SHELL_ALIGN(sizeof(struct nfile)),
8019 [NFROM ] = SHELL_ALIGN(sizeof(struct nfile)),
8020 [NFROMTO ] = SHELL_ALIGN(sizeof(struct nfile)),
8021 [NAPPEND ] = SHELL_ALIGN(sizeof(struct nfile)),
8022 [NTOFD ] = SHELL_ALIGN(sizeof(struct ndup)),
8023 [NFROMFD ] = SHELL_ALIGN(sizeof(struct ndup)),
8024 [NHERE ] = SHELL_ALIGN(sizeof(struct nhere)),
8025 [NXHERE ] = SHELL_ALIGN(sizeof(struct nhere)),
8026 [NNOT ] = SHELL_ALIGN(sizeof(struct nnot)),
8029 static void calcsize(union node *n);
8032 sizenodelist(struct nodelist *lp)
8035 funcblocksize += SHELL_ALIGN(sizeof(struct nodelist));
8042 calcsize(union node *n)
8046 funcblocksize += nodesize[n->type];
8049 calcsize(n->ncmd.redirect);
8050 calcsize(n->ncmd.args);
8051 calcsize(n->ncmd.assign);
8054 sizenodelist(n->npipe.cmdlist);
8059 calcsize(n->nredir.redirect);
8060 calcsize(n->nredir.n);
8067 calcsize(n->nbinary.ch2);
8068 calcsize(n->nbinary.ch1);
8071 calcsize(n->nif.elsepart);
8072 calcsize(n->nif.ifpart);
8073 calcsize(n->nif.test);
8076 funcstringsize += strlen(n->nfor.var) + 1;
8077 calcsize(n->nfor.body);
8078 calcsize(n->nfor.args);
8081 calcsize(n->ncase.cases);
8082 calcsize(n->ncase.expr);
8085 calcsize(n->nclist.body);
8086 calcsize(n->nclist.pattern);
8087 calcsize(n->nclist.next);
8091 sizenodelist(n->narg.backquote);
8092 funcstringsize += strlen(n->narg.text) + 1;
8093 calcsize(n->narg.next);
8096 #if ENABLE_ASH_BASH_COMPAT
8103 calcsize(n->nfile.fname);
8104 calcsize(n->nfile.next);
8108 calcsize(n->ndup.vname);
8109 calcsize(n->ndup.next);
8113 calcsize(n->nhere.doc);
8114 calcsize(n->nhere.next);
8117 calcsize(n->nnot.com);
8123 nodeckstrdup(char *s)
8125 char *rtn = funcstring;
8127 strcpy(funcstring, s);
8128 funcstring += strlen(s) + 1;
8132 static union node *copynode(union node *);
8134 static struct nodelist *
8135 copynodelist(struct nodelist *lp)
8137 struct nodelist *start;
8138 struct nodelist **lpp;
8143 funcblock = (char *) funcblock + SHELL_ALIGN(sizeof(struct nodelist));
8144 (*lpp)->n = copynode(lp->n);
8146 lpp = &(*lpp)->next;
8153 copynode(union node *n)
8160 funcblock = (char *) funcblock + nodesize[n->type];
8164 new->ncmd.redirect = copynode(n->ncmd.redirect);
8165 new->ncmd.args = copynode(n->ncmd.args);
8166 new->ncmd.assign = copynode(n->ncmd.assign);
8169 new->npipe.cmdlist = copynodelist(n->npipe.cmdlist);
8170 new->npipe.pipe_backgnd = n->npipe.pipe_backgnd;
8175 new->nredir.redirect = copynode(n->nredir.redirect);
8176 new->nredir.n = copynode(n->nredir.n);
8183 new->nbinary.ch2 = copynode(n->nbinary.ch2);
8184 new->nbinary.ch1 = copynode(n->nbinary.ch1);
8187 new->nif.elsepart = copynode(n->nif.elsepart);
8188 new->nif.ifpart = copynode(n->nif.ifpart);
8189 new->nif.test = copynode(n->nif.test);
8192 new->nfor.var = nodeckstrdup(n->nfor.var);
8193 new->nfor.body = copynode(n->nfor.body);
8194 new->nfor.args = copynode(n->nfor.args);
8197 new->ncase.cases = copynode(n->ncase.cases);
8198 new->ncase.expr = copynode(n->ncase.expr);
8201 new->nclist.body = copynode(n->nclist.body);
8202 new->nclist.pattern = copynode(n->nclist.pattern);
8203 new->nclist.next = copynode(n->nclist.next);
8207 new->narg.backquote = copynodelist(n->narg.backquote);
8208 new->narg.text = nodeckstrdup(n->narg.text);
8209 new->narg.next = copynode(n->narg.next);
8212 #if ENABLE_ASH_BASH_COMPAT
8219 new->nfile.fname = copynode(n->nfile.fname);
8220 new->nfile.fd = n->nfile.fd;
8221 new->nfile.next = copynode(n->nfile.next);
8225 new->ndup.vname = copynode(n->ndup.vname);
8226 new->ndup.dupfd = n->ndup.dupfd;
8227 new->ndup.fd = n->ndup.fd;
8228 new->ndup.next = copynode(n->ndup.next);
8232 new->nhere.doc = copynode(n->nhere.doc);
8233 new->nhere.fd = n->nhere.fd;
8234 new->nhere.next = copynode(n->nhere.next);
8237 new->nnot.com = copynode(n->nnot.com);
8240 new->type = n->type;
8245 * Make a copy of a parse tree.
8247 static struct funcnode *
8248 copyfunc(union node *n)
8253 funcblocksize = offsetof(struct funcnode, n);
8256 blocksize = funcblocksize;
8257 f = ckmalloc(blocksize + funcstringsize);
8258 funcblock = (char *) f + offsetof(struct funcnode, n);
8259 funcstring = (char *) f + blocksize;
8266 * Define a shell function.
8269 defun(char *name, union node *func)
8271 struct cmdentry entry;
8274 entry.cmdtype = CMDFUNCTION;
8275 entry.u.func = copyfunc(func);
8276 addcmdentry(name, &entry);
8280 /* Reasons for skipping commands (see comment on breakcmd routine) */
8281 #define SKIPBREAK (1 << 0)
8282 #define SKIPCONT (1 << 1)
8283 #define SKIPFUNC (1 << 2)
8284 #define SKIPFILE (1 << 3)
8285 #define SKIPEVAL (1 << 4)
8286 static smallint evalskip; /* set to SKIPxxx if we are skipping commands */
8287 static int skipcount; /* number of levels to skip */
8288 static int funcnest; /* depth of function calls */
8289 static int loopnest; /* current loop nesting level */
8291 /* Forward decl way out to parsing code - dotrap needs it */
8292 static int evalstring(char *s, int mask);
8294 /* Called to execute a trap.
8295 * Single callsite - at the end of evaltree().
8296 * If we return non-zero, evaltree raises EXEXIT exception.
8298 * Perhaps we should avoid entering new trap handlers
8299 * while we are executing a trap handler. [is it a TODO?]
8308 savestatus = exitstatus;
8312 TRACE(("dotrap entered\n"));
8313 for (sig = 1, g = gotsig; sig < NSIG; sig++, g++) {
8320 /* non-trapped SIGINT is handled separately by raise_interrupt,
8321 * don't upset it by resetting gotsig[SIGINT-1] */
8322 if (sig == SIGINT && !t)
8325 TRACE(("sig %d is active, will run handler '%s'\n", sig, t));
8329 want_exexit = evalstring(t, SKIPEVAL);
8330 exitstatus = savestatus;
8332 TRACE(("dotrap returns %d\n", want_exexit));
8337 TRACE(("dotrap returns 0\n"));
8341 /* forward declarations - evaluation is fairly recursive business... */
8342 static void evalloop(union node *, int);
8343 static void evalfor(union node *, int);
8344 static void evalcase(union node *, int);
8345 static void evalsubshell(union node *, int);
8346 static void expredir(union node *);
8347 static void evalpipe(union node *, int);
8348 static void evalcommand(union node *, int);
8349 static int evalbltin(const struct builtincmd *, int, char **);
8350 static void prehash(union node *);
8353 * Evaluate a parse tree. The value is left in the global variable
8357 evaltree(union node *n, int flags)
8359 struct jmploc *volatile savehandler = exception_handler;
8360 struct jmploc jmploc;
8362 void (*evalfn)(union node *, int);
8366 SAVE_INT(int_level);
8369 TRACE(("evaltree(NULL) called\n"));
8372 TRACE(("evaltree(%p: %d, %d) called\n", n, n->type, flags));
8374 exception_handler = &jmploc;
8376 int err = setjmp(jmploc.loc);
8378 /* if it was a signal, check for trap handlers */
8379 if (exception_type == EXSIG) {
8380 TRACE(("exception %d (EXSIG) in evaltree, err=%d\n",
8381 exception_type, err));
8384 /* continue on the way out */
8385 TRACE(("exception %d in evaltree, propagating err=%d\n",
8386 exception_type, err));
8387 exception_handler = savehandler;
8388 longjmp(exception_handler->loc, err);
8395 out1fmt("Node type = %d\n", n->type);
8400 evaltree(n->nnot.com, EV_TESTED);
8401 status = !exitstatus;
8404 expredir(n->nredir.redirect);
8405 status = redirectsafe(n->nredir.redirect, REDIR_PUSH);
8407 evaltree(n->nredir.n, flags & EV_TESTED);
8408 status = exitstatus;
8410 popredir(/*drop:*/ 0, /*restore:*/ 0 /* not sure */);
8413 evalfn = evalcommand;
8415 if (eflag && !(flags & EV_TESTED))
8427 evalfn = evalsubshell;
8440 #error NAND + 1 != NOR
8442 #if NOR + 1 != NSEMI
8443 #error NOR + 1 != NSEMI
8445 unsigned is_or = n->type - NAND;
8448 (flags | ((is_or >> 1) - 1)) & EV_TESTED
8450 if (!exitstatus == is_or)
8463 evaltree(n->nif.test, EV_TESTED);
8466 if (exitstatus == 0) {
8470 if (n->nif.elsepart) {
8471 n = n->nif.elsepart;
8476 defun(n->narg.text, n->narg.next);
8480 exitstatus = status;
8485 exception_handler = savehandler;
8488 /* Order of checks below is important:
8489 * signal handlers trigger before exit caused by "set -e".
8491 if (pending_sig && dotrap())
8493 if (checkexit & exitstatus)
8494 evalskip |= SKIPEVAL;
8496 if (flags & EV_EXIT) {
8498 raise_exception(EXEXIT);
8501 RESTORE_INT(int_level);
8502 TRACE(("leaving evaltree (no interrupts)\n"));
8505 #if !defined(__alpha__) || (defined(__GNUC__) && __GNUC__ >= 3)
8508 void evaltreenr(union node *, int) __attribute__ ((alias("evaltree"),__noreturn__));
8511 evalloop(union node *n, int flags)
8521 evaltree(n->nbinary.ch1, EV_TESTED);
8524 if (evalskip == SKIPCONT && --skipcount <= 0) {
8528 if (evalskip == SKIPBREAK && --skipcount <= 0)
8533 if (n->type != NWHILE)
8537 evaltree(n->nbinary.ch2, flags);
8538 status = exitstatus;
8543 exitstatus = status;
8547 evalfor(union node *n, int flags)
8549 struct arglist arglist;
8552 struct stackmark smark;
8554 setstackmark(&smark);
8555 arglist.list = NULL;
8556 arglist.lastp = &arglist.list;
8557 for (argp = n->nfor.args; argp; argp = argp->narg.next) {
8558 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE | EXP_RECORD);
8563 *arglist.lastp = NULL;
8568 for (sp = arglist.list; sp; sp = sp->next) {
8569 setvar(n->nfor.var, sp->text, 0);
8570 evaltree(n->nfor.body, flags);
8572 if (evalskip == SKIPCONT && --skipcount <= 0) {
8576 if (evalskip == SKIPBREAK && --skipcount <= 0)
8583 popstackmark(&smark);
8587 evalcase(union node *n, int flags)
8591 struct arglist arglist;
8592 struct stackmark smark;
8594 setstackmark(&smark);
8595 arglist.list = NULL;
8596 arglist.lastp = &arglist.list;
8597 expandarg(n->ncase.expr, &arglist, EXP_TILDE);
8599 for (cp = n->ncase.cases; cp && evalskip == 0; cp = cp->nclist.next) {
8600 for (patp = cp->nclist.pattern; patp; patp = patp->narg.next) {
8601 if (casematch(patp, arglist.list->text)) {
8602 if (evalskip == 0) {
8603 evaltree(cp->nclist.body, flags);
8610 popstackmark(&smark);
8614 * Kick off a subshell to evaluate a tree.
8617 evalsubshell(union node *n, int flags)
8620 int backgnd = (n->type == NBACKGND);
8623 expredir(n->nredir.redirect);
8624 if (!backgnd && (flags & EV_EXIT) && !may_have_traps)
8627 jp = makejob(/*n,*/ 1);
8628 if (forkshell(jp, n, backgnd) == 0) {
8633 flags &= ~EV_TESTED;
8635 redirect(n->nredir.redirect, 0);
8636 evaltreenr(n->nredir.n, flags);
8641 status = waitforjob(jp);
8642 exitstatus = status;
8647 * Compute the names of the files in a redirection list.
8649 static void fixredir(union node *, const char *, int);
8651 expredir(union node *n)
8655 for (redir = n; redir; redir = redir->nfile.next) {
8659 fn.lastp = &fn.list;
8660 switch (redir->type) {
8664 #if ENABLE_ASH_BASH_COMPAT
8669 expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR);
8670 TRACE(("expredir expanded to '%s'\n", fn.list->text));
8671 #if ENABLE_ASH_BASH_COMPAT
8674 redir->nfile.expfname = fn.list->text;
8677 case NTOFD: /* >& */
8678 if (redir->ndup.vname) {
8679 expandarg(redir->ndup.vname, &fn, EXP_FULL | EXP_TILDE);
8680 if (fn.list == NULL)
8681 ash_msg_and_raise_error("redir error");
8682 #if ENABLE_ASH_BASH_COMPAT
8683 //FIXME: we used expandarg with different args!
8684 if (!isdigit_str9(fn.list->text)) {
8685 /* >&file, not >&fd */
8686 if (redir->nfile.fd != 1) /* 123>&file - BAD */
8687 ash_msg_and_raise_error("redir error");
8689 goto store_expfname;
8692 fixredir(redir, fn.list->text, 1);
8700 * Evaluate a pipeline. All the processes in the pipeline are children
8701 * of the process creating the pipeline. (This differs from some versions
8702 * of the shell, which make the last process in a pipeline the parent
8706 evalpipe(union node *n, int flags)
8709 struct nodelist *lp;
8714 TRACE(("evalpipe(0x%lx) called\n", (long)n));
8716 for (lp = n->npipe.cmdlist; lp; lp = lp->next)
8720 jp = makejob(/*n,*/ pipelen);
8722 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
8726 if (pipe(pip) < 0) {
8728 ash_msg_and_raise_error("pipe call failed");
8731 if (forkshell(jp, lp->n, n->npipe.pipe_backgnd) == 0) {
8744 evaltreenr(lp->n, flags);
8750 /* Don't want to trigger debugging */
8754 if (n->npipe.pipe_backgnd == 0) {
8755 exitstatus = waitforjob(jp);
8756 TRACE(("evalpipe: job done exit status %d\n", exitstatus));
8762 * Controls whether the shell is interactive or not.
8765 setinteractive(int on)
8767 static smallint is_interactive;
8769 if (++on == is_interactive)
8771 is_interactive = on;
8775 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
8776 if (is_interactive > 1) {
8777 /* Looks like they want an interactive shell */
8778 static smallint did_banner;
8781 /* note: ash and hush share this string */
8782 out1fmt("\n\n%s %s\n"
8783 "Enter 'help' for a list of built-in commands."
8786 "built-in shell (ash)"
8800 setinteractive(iflag);
8802 #if ENABLE_FEATURE_EDITING_VI
8804 line_input_state->flags |= VI_MODE;
8806 line_input_state->flags &= ~VI_MODE;
8808 viflag = 0; /* forcibly keep the option off */
8812 static struct localvar *localvars;
8815 * Called after a function returns.
8816 * Interrupts must be off.
8821 struct localvar *lvp;
8824 while ((lvp = localvars) != NULL) {
8825 localvars = lvp->next;
8827 TRACE(("poplocalvar %s\n", vp ? vp->var_text : "-"));
8828 if (vp == NULL) { /* $- saved */
8829 memcpy(optlist, lvp->text, sizeof(optlist));
8830 free((char*)lvp->text);
8832 } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) {
8833 unsetvar(vp->var_text);
8836 vp->var_func(var_end(lvp->text));
8837 if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
8838 free((char*)vp->var_text);
8839 vp->flags = lvp->flags;
8840 vp->var_text = lvp->text;
8847 evalfun(struct funcnode *func, int argc, char **argv, int flags)
8849 volatile struct shparam saveparam;
8850 struct localvar *volatile savelocalvars;
8851 struct jmploc *volatile savehandler;
8852 struct jmploc jmploc;
8855 saveparam = shellparam;
8856 savelocalvars = localvars;
8857 e = setjmp(jmploc.loc);
8862 savehandler = exception_handler;
8863 exception_handler = &jmploc;
8865 shellparam.malloced = 0;
8869 shellparam.nparam = argc - 1;
8870 shellparam.p = argv + 1;
8871 #if ENABLE_ASH_GETOPTS
8872 shellparam.optind = 1;
8873 shellparam.optoff = -1;
8875 evaltree(&func->n, flags & EV_TESTED);
8881 localvars = savelocalvars;
8882 freeparam(&shellparam);
8883 shellparam = saveparam;
8884 exception_handler = savehandler;
8886 evalskip &= ~SKIPFUNC;
8890 #if ENABLE_ASH_CMDCMD
8892 parse_command_args(char **argv, const char **path)
8905 if (c == '-' && !*cp) {
8912 *path = bb_default_path;
8915 /* run 'typecmd' for other options */
8926 * Make a variable a local variable. When a variable is made local, it's
8927 * value and flags are saved in a localvar structure. The saved values
8928 * will be restored when the shell function returns. We handle the name
8929 * "-" as a special case.
8934 struct localvar *lvp;
8939 lvp = ckzalloc(sizeof(struct localvar));
8940 if (LONE_DASH(name)) {
8942 p = ckmalloc(sizeof(optlist));
8943 lvp->text = memcpy(p, optlist, sizeof(optlist));
8948 vpp = hashvar(name);
8949 vp = *findvar(vpp, name);
8950 eq = strchr(name, '=');
8953 setvareq(name, VSTRFIXED);
8955 setvar(name, NULL, VSTRFIXED);
8956 vp = *vpp; /* the new variable */
8957 lvp->flags = VUNSET;
8959 lvp->text = vp->var_text;
8960 lvp->flags = vp->flags;
8961 vp->flags |= VSTRFIXED|VTEXTFIXED;
8967 lvp->next = localvars;
8973 * The "local" command.
8975 static int FAST_FUNC
8976 localcmd(int argc UNUSED_PARAM, char **argv)
8981 while ((name = *argv++) != NULL) {
8987 static int FAST_FUNC
8988 falsecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
8993 static int FAST_FUNC
8994 truecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
8999 static int FAST_FUNC
9000 execcmd(int argc UNUSED_PARAM, char **argv)
9003 iflag = 0; /* exit on error */
9006 shellexec(argv + 1, pathval(), 0);
9012 * The return command.
9014 static int FAST_FUNC
9015 returncmd(int argc UNUSED_PARAM, char **argv)
9018 * If called outside a function, do what ksh does;
9019 * skip the rest of the file.
9021 evalskip = funcnest ? SKIPFUNC : SKIPFILE;
9022 return argv[1] ? number(argv[1]) : exitstatus;
9025 /* Forward declarations for builtintab[] */
9026 static int breakcmd(int, char **) FAST_FUNC;
9027 static int dotcmd(int, char **) FAST_FUNC;
9028 static int evalcmd(int, char **) FAST_FUNC;
9029 static int exitcmd(int, char **) FAST_FUNC;
9030 static int exportcmd(int, char **) FAST_FUNC;
9031 #if ENABLE_ASH_GETOPTS
9032 static int getoptscmd(int, char **) FAST_FUNC;
9034 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
9035 static int helpcmd(int, char **) FAST_FUNC;
9037 #if ENABLE_SH_MATH_SUPPORT
9038 static int letcmd(int, char **) FAST_FUNC;
9040 static int readcmd(int, char **) FAST_FUNC;
9041 static int setcmd(int, char **) FAST_FUNC;
9042 static int shiftcmd(int, char **) FAST_FUNC;
9043 static int timescmd(int, char **) FAST_FUNC;
9044 static int trapcmd(int, char **) FAST_FUNC;
9045 static int umaskcmd(int, char **) FAST_FUNC;
9046 static int unsetcmd(int, char **) FAST_FUNC;
9047 static int ulimitcmd(int, char **) FAST_FUNC;
9049 #define BUILTIN_NOSPEC "0"
9050 #define BUILTIN_SPECIAL "1"
9051 #define BUILTIN_REGULAR "2"
9052 #define BUILTIN_SPEC_REG "3"
9053 #define BUILTIN_ASSIGN "4"
9054 #define BUILTIN_SPEC_ASSG "5"
9055 #define BUILTIN_REG_ASSG "6"
9056 #define BUILTIN_SPEC_REG_ASSG "7"
9058 /* Stubs for calling non-FAST_FUNC's */
9059 #if ENABLE_ASH_BUILTIN_ECHO
9060 static int FAST_FUNC echocmd(int argc, char **argv) { return echo_main(argc, argv); }
9062 #if ENABLE_ASH_BUILTIN_PRINTF
9063 static int FAST_FUNC printfcmd(int argc, char **argv) { return printf_main(argc, argv); }
9065 #if ENABLE_ASH_BUILTIN_TEST
9066 static int FAST_FUNC testcmd(int argc, char **argv) { return test_main(argc, argv); }
9069 /* Keep these in proper order since it is searched via bsearch() */
9070 static const struct builtincmd builtintab[] = {
9071 { BUILTIN_SPEC_REG "." , dotcmd },
9072 { BUILTIN_SPEC_REG ":" , truecmd },
9073 #if ENABLE_ASH_BUILTIN_TEST
9074 { BUILTIN_REGULAR "[" , testcmd },
9075 #if ENABLE_ASH_BASH_COMPAT
9076 { BUILTIN_REGULAR "[[" , testcmd },
9079 #if ENABLE_ASH_ALIAS
9080 { BUILTIN_REG_ASSG "alias" , aliascmd },
9083 { BUILTIN_REGULAR "bg" , fg_bgcmd },
9085 { BUILTIN_SPEC_REG "break" , breakcmd },
9086 { BUILTIN_REGULAR "cd" , cdcmd },
9087 { BUILTIN_NOSPEC "chdir" , cdcmd },
9088 #if ENABLE_ASH_CMDCMD
9089 { BUILTIN_REGULAR "command" , commandcmd },
9091 { BUILTIN_SPEC_REG "continue", breakcmd },
9092 #if ENABLE_ASH_BUILTIN_ECHO
9093 { BUILTIN_REGULAR "echo" , echocmd },
9095 { BUILTIN_SPEC_REG "eval" , evalcmd },
9096 { BUILTIN_SPEC_REG "exec" , execcmd },
9097 { BUILTIN_SPEC_REG "exit" , exitcmd },
9098 { BUILTIN_SPEC_REG_ASSG "export" , exportcmd },
9099 { BUILTIN_REGULAR "false" , falsecmd },
9101 { BUILTIN_REGULAR "fg" , fg_bgcmd },
9103 #if ENABLE_ASH_GETOPTS
9104 { BUILTIN_REGULAR "getopts" , getoptscmd },
9106 { BUILTIN_NOSPEC "hash" , hashcmd },
9107 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
9108 { BUILTIN_NOSPEC "help" , helpcmd },
9111 { BUILTIN_REGULAR "jobs" , jobscmd },
9112 { BUILTIN_REGULAR "kill" , killcmd },
9114 #if ENABLE_SH_MATH_SUPPORT
9115 { BUILTIN_NOSPEC "let" , letcmd },
9117 { BUILTIN_ASSIGN "local" , localcmd },
9118 #if ENABLE_ASH_BUILTIN_PRINTF
9119 { BUILTIN_REGULAR "printf" , printfcmd },
9121 { BUILTIN_NOSPEC "pwd" , pwdcmd },
9122 { BUILTIN_REGULAR "read" , readcmd },
9123 { BUILTIN_SPEC_REG_ASSG "readonly", exportcmd },
9124 { BUILTIN_SPEC_REG "return" , returncmd },
9125 { BUILTIN_SPEC_REG "set" , setcmd },
9126 { BUILTIN_SPEC_REG "shift" , shiftcmd },
9127 #if ENABLE_ASH_BASH_COMPAT
9128 { BUILTIN_SPEC_REG "source" , dotcmd },
9130 #if ENABLE_ASH_BUILTIN_TEST
9131 { BUILTIN_REGULAR "test" , testcmd },
9133 { BUILTIN_SPEC_REG "times" , timescmd },
9134 { BUILTIN_SPEC_REG "trap" , trapcmd },
9135 { BUILTIN_REGULAR "true" , truecmd },
9136 { BUILTIN_NOSPEC "type" , typecmd },
9137 { BUILTIN_NOSPEC "ulimit" , ulimitcmd },
9138 { BUILTIN_REGULAR "umask" , umaskcmd },
9139 #if ENABLE_ASH_ALIAS
9140 { BUILTIN_REGULAR "unalias" , unaliascmd },
9142 { BUILTIN_SPEC_REG "unset" , unsetcmd },
9143 { BUILTIN_REGULAR "wait" , waitcmd },
9146 /* Should match the above table! */
9147 #define COMMANDCMD (builtintab + \
9149 1 * ENABLE_ASH_BUILTIN_TEST + \
9150 1 * ENABLE_ASH_BUILTIN_TEST * ENABLE_ASH_BASH_COMPAT + \
9151 1 * ENABLE_ASH_ALIAS + \
9152 1 * ENABLE_ASH_JOB_CONTROL + \
9154 #define EXECCMD (builtintab + \
9156 1 * ENABLE_ASH_BUILTIN_TEST + \
9157 1 * ENABLE_ASH_BUILTIN_TEST * ENABLE_ASH_BASH_COMPAT + \
9158 1 * ENABLE_ASH_ALIAS + \
9159 1 * ENABLE_ASH_JOB_CONTROL + \
9161 1 * ENABLE_ASH_CMDCMD + \
9163 ENABLE_ASH_BUILTIN_ECHO + \
9167 * Search the table of builtin commands.
9169 static struct builtincmd *
9170 find_builtin(const char *name)
9172 struct builtincmd *bp;
9175 name, builtintab, ARRAY_SIZE(builtintab), sizeof(builtintab[0]),
9182 * Execute a simple command.
9185 isassignment(const char *p)
9187 const char *q = endofname(p);
9192 static int FAST_FUNC
9193 bltincmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
9195 /* Preserve exitstatus of a previous possible redirection
9196 * as POSIX mandates */
9197 return back_exitstatus;
9200 evalcommand(union node *cmd, int flags)
9202 static const struct builtincmd null_bltin = {
9203 "\0\0", bltincmd /* why three NULs? */
9205 struct stackmark smark;
9207 struct arglist arglist;
9208 struct arglist varlist;
9211 const struct strlist *sp;
9212 struct cmdentry cmdentry;
9219 struct builtincmd *bcmd;
9220 smallint cmd_is_exec;
9221 smallint pseudovarflag = 0;
9223 /* First expand the arguments. */
9224 TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags));
9225 setstackmark(&smark);
9226 back_exitstatus = 0;
9228 cmdentry.cmdtype = CMDBUILTIN;
9229 cmdentry.u.cmd = &null_bltin;
9230 varlist.lastp = &varlist.list;
9231 *varlist.lastp = NULL;
9232 arglist.lastp = &arglist.list;
9233 *arglist.lastp = NULL;
9236 if (cmd->ncmd.args) {
9237 bcmd = find_builtin(cmd->ncmd.args->narg.text);
9238 pseudovarflag = bcmd && IS_BUILTIN_ASSIGN(bcmd);
9241 for (argp = cmd->ncmd.args; argp; argp = argp->narg.next) {
9242 struct strlist **spp;
9244 spp = arglist.lastp;
9245 if (pseudovarflag && isassignment(argp->narg.text))
9246 expandarg(argp, &arglist, EXP_VARTILDE);
9248 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
9250 for (sp = *spp; sp; sp = sp->next)
9254 argv = nargv = stalloc(sizeof(char *) * (argc + 1));
9255 for (sp = arglist.list; sp; sp = sp->next) {
9256 TRACE(("evalcommand arg: %s\n", sp->text));
9257 *nargv++ = sp->text;
9262 if (iflag && funcnest == 0 && argc > 0)
9263 lastarg = nargv[-1];
9266 expredir(cmd->ncmd.redirect);
9267 status = redirectsafe(cmd->ncmd.redirect, REDIR_PUSH | REDIR_SAVEFD2);
9269 path = vpath.var_text;
9270 for (argp = cmd->ncmd.assign; argp; argp = argp->narg.next) {
9271 struct strlist **spp;
9274 spp = varlist.lastp;
9275 expandarg(argp, &varlist, EXP_VARTILDE);
9278 * Modify the command lookup path, if a PATH= assignment
9282 if (varcmp(p, path) == 0)
9286 /* Print the command if xflag is set. */
9289 const char *p = " %s" + 1;
9291 fdprintf(preverrout_fd, p, expandstr(ps4val()));
9293 for (n = 0; n < 2; n++) {
9295 fdprintf(preverrout_fd, p, sp->text);
9301 safe_write(preverrout_fd, "\n", 1);
9307 /* Now locate the command. */
9309 const char *oldpath;
9310 int cmd_flag = DO_ERR;
9315 find_command(argv[0], &cmdentry, cmd_flag, path);
9316 if (cmdentry.cmdtype == CMDUNKNOWN) {
9317 flush_stdout_stderr();
9322 /* implement bltin and command here */
9323 if (cmdentry.cmdtype != CMDBUILTIN)
9326 spclbltin = IS_BUILTIN_SPECIAL(cmdentry.u.cmd);
9327 if (cmdentry.u.cmd == EXECCMD)
9329 #if ENABLE_ASH_CMDCMD
9330 if (cmdentry.u.cmd == COMMANDCMD) {
9332 nargv = parse_command_args(argv, &path);
9335 argc -= nargv - argv;
9337 cmd_flag |= DO_NOFUNC;
9345 /* We have a redirection error. */
9347 raise_exception(EXERROR);
9349 exitstatus = status;
9353 /* Execute the command. */
9354 switch (cmdentry.cmdtype) {
9357 #if ENABLE_FEATURE_SH_NOFORK
9358 /* (1) BUG: if variables are set, we need to fork, or save/restore them
9359 * around run_nofork_applet() call.
9360 * (2) Should this check also be done in forkshell()?
9361 * (perhaps it should, so that "VAR=VAL nofork" at least avoids exec...)
9363 /* find_command() encodes applet_no as (-2 - applet_no) */
9364 int applet_no = (- cmdentry.u.index - 2);
9365 if (applet_no >= 0 && APPLET_IS_NOFORK(applet_no)) {
9366 listsetvar(varlist.list, VEXPORT|VSTACK);
9367 /* run <applet>_main() */
9368 exitstatus = run_nofork_applet(applet_no, argv);
9372 /* Can we avoid forking off? For example, very last command
9373 * in a script or a subshell does not need forking,
9374 * we can just exec it.
9376 if (!(flags & EV_EXIT) || may_have_traps) {
9377 /* No, forking off a child is necessary */
9379 jp = makejob(/*cmd,*/ 1);
9380 if (forkshell(jp, cmd, FORK_FG) != 0) {
9382 exitstatus = waitforjob(jp);
9384 TRACE(("forked child exited with %d\n", exitstatus));
9389 /* fall through to exec'ing external program */
9391 listsetvar(varlist.list, VEXPORT|VSTACK);
9392 shellexec(argv, path, cmdentry.u.index);
9396 cmdenviron = varlist.list;
9398 struct strlist *list = cmdenviron;
9400 if (spclbltin > 0 || argc == 0) {
9402 if (cmd_is_exec && argc > 1)
9405 listsetvar(list, i);
9407 /* Tight loop with builtins only:
9408 * "while kill -0 $child; do true; done"
9409 * will never exit even if $child died, unless we do this
9410 * to reap the zombie and make kill detect that it's gone: */
9411 dowait(DOWAIT_NONBLOCK, NULL);
9413 if (evalbltin(cmdentry.u.cmd, argc, argv)) {
9415 int i = exception_type;
9420 exit_status = 128 + SIGINT;
9422 exit_status = 128 + pending_sig;
9423 exitstatus = exit_status;
9424 if (i == EXINT || spclbltin > 0) {
9426 longjmp(exception_handler->loc, 1);
9433 listsetvar(varlist.list, 0);
9434 /* See above for the rationale */
9435 dowait(DOWAIT_NONBLOCK, NULL);
9436 if (evalfun(cmdentry.u.func, argc, argv, flags))
9443 popredir(/*drop:*/ cmd_is_exec, /*restore:*/ cmd_is_exec);
9445 /* dsl: I think this is intended to be used to support
9446 * '_' in 'vi' command mode during line editing...
9447 * However I implemented that within libedit itself.
9449 setvar("_", lastarg, 0);
9451 popstackmark(&smark);
9455 evalbltin(const struct builtincmd *cmd, int argc, char **argv)
9457 char *volatile savecmdname;
9458 struct jmploc *volatile savehandler;
9459 struct jmploc jmploc;
9462 savecmdname = commandname;
9463 i = setjmp(jmploc.loc);
9466 savehandler = exception_handler;
9467 exception_handler = &jmploc;
9468 commandname = argv[0];
9470 optptr = NULL; /* initialize nextopt */
9471 exitstatus = (*cmd->builtin)(argc, argv);
9472 flush_stdout_stderr();
9474 exitstatus |= ferror(stdout);
9476 commandname = savecmdname;
9477 exception_handler = savehandler;
9483 goodname(const char *p)
9485 return endofname(p)[0] == '\0';
9490 * Search for a command. This is called before we fork so that the
9491 * location of the command will be available in the parent as well as
9492 * the child. The check for "goodname" is an overly conservative
9493 * check that the name will not be subject to expansion.
9496 prehash(union node *n)
9498 struct cmdentry entry;
9500 if (n->type == NCMD && n->ncmd.args && goodname(n->ncmd.args->narg.text))
9501 find_command(n->ncmd.args->narg.text, &entry, 0, pathval());
9505 /* ============ Builtin commands
9507 * Builtin commands whose functions are closely tied to evaluation
9508 * are implemented here.
9512 * Handle break and continue commands. Break, continue, and return are
9513 * all handled by setting the evalskip flag. The evaluation routines
9514 * above all check this flag, and if it is set they start skipping
9515 * commands rather than executing them. The variable skipcount is
9516 * the number of loops to break/continue, or the number of function
9517 * levels to return. (The latter is always 1.) It should probably
9518 * be an error to break out of more loops than exist, but it isn't
9519 * in the standard shell so we don't make it one here.
9521 static int FAST_FUNC
9522 breakcmd(int argc UNUSED_PARAM, char **argv)
9524 int n = argv[1] ? number(argv[1]) : 1;
9527 ash_msg_and_raise_error(msg_illnum, argv[1]);
9531 evalskip = (**argv == 'c') ? SKIPCONT : SKIPBREAK;
9538 /* ============ input.c
9540 * This implements the input routines used by the parser.
9544 INPUT_PUSH_FILE = 1,
9545 INPUT_NOFILE_OK = 2,
9548 static smallint checkkwd;
9549 /* values of checkkwd variable */
9550 #define CHKALIAS 0x1
9555 * Push a string back onto the input at this current parsefile level.
9556 * We handle aliases this way.
9558 #if !ENABLE_ASH_ALIAS
9559 #define pushstring(s, ap) pushstring(s)
9562 pushstring(char *s, struct alias *ap)
9569 if (g_parsefile->strpush) {
9570 sp = ckzalloc(sizeof(*sp));
9571 sp->prev = g_parsefile->strpush;
9573 sp = &(g_parsefile->basestrpush);
9575 g_parsefile->strpush = sp;
9576 sp->prev_string = g_parsefile->next_to_pgetc;
9577 sp->prev_left_in_line = g_parsefile->left_in_line;
9578 #if ENABLE_ASH_ALIAS
9581 ap->flag |= ALIASINUSE;
9585 g_parsefile->next_to_pgetc = s;
9586 g_parsefile->left_in_line = len;
9593 struct strpush *sp = g_parsefile->strpush;
9596 #if ENABLE_ASH_ALIAS
9598 if (g_parsefile->next_to_pgetc[-1] == ' '
9599 || g_parsefile->next_to_pgetc[-1] == '\t'
9601 checkkwd |= CHKALIAS;
9603 if (sp->string != sp->ap->val) {
9606 sp->ap->flag &= ~ALIASINUSE;
9607 if (sp->ap->flag & ALIASDEAD) {
9608 unalias(sp->ap->name);
9612 g_parsefile->next_to_pgetc = sp->prev_string;
9613 g_parsefile->left_in_line = sp->prev_left_in_line;
9614 g_parsefile->strpush = sp->prev;
9615 if (sp != &(g_parsefile->basestrpush))
9620 //FIXME: BASH_COMPAT with "...&" does TWO pungetc():
9621 //it peeks whether it is &>, and then pushes back both chars.
9622 //This function needs to save last *next_to_pgetc to buf[0]
9623 //to make two pungetc() reliable. Currently,
9624 // pgetc (out of buf: does preadfd), pgetc, pungetc, pungetc won't work...
9629 char *buf = g_parsefile->buf;
9631 g_parsefile->next_to_pgetc = buf;
9632 #if ENABLE_FEATURE_EDITING
9634 if (!iflag || g_parsefile->pf_fd != STDIN_FILENO)
9635 nr = nonblock_immune_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1, /*loop_on_EINTR:*/ 1);
9638 # if ENABLE_ASH_IDLE_TIMEOUT
9640 const char *tmout_var = lookupvar("TMOUT");
9642 timeout = atoi(tmout_var) * 1000;
9648 # if ENABLE_FEATURE_TAB_COMPLETION
9649 line_input_state->path_lookup = pathval();
9651 /* Unicode support should be activated even if LANG is set
9652 * _during_ shell execution, not only if it was set when
9653 * shell was started. Therefore, re-check LANG every time:
9655 reinit_unicode(lookupvar("LANG"));
9656 nr = read_line_input(line_input_state, cmdedit_prompt, buf, IBUFSIZ, timeout);
9658 /* Ctrl+C pressed */
9669 /* Ctrl+D pressed */
9672 # if ENABLE_ASH_IDLE_TIMEOUT
9673 else if (errno == EAGAIN && timeout > 0) {
9674 printf("\007timed out waiting for input: auto-logout\n");
9681 nr = nonblock_immune_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1, /*loop_on_EINTR:*/ 1);
9684 #if 0 /* disabled: nonblock_immune_read() handles this problem */
9686 if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
9687 int flags = fcntl(0, F_GETFL);
9688 if (flags >= 0 && (flags & O_NONBLOCK)) {
9689 flags &= ~O_NONBLOCK;
9690 if (fcntl(0, F_SETFL, flags) >= 0) {
9691 out2str("sh: turning off NDELAY mode\n");
9702 * Refill the input buffer and return the next input character:
9704 * 1) If a string was pushed back on the input, pop it;
9705 * 2) If an EOF was pushed back (g_parsefile->left_in_line < -BIGNUM)
9706 * or we are reading from a string so we can't refill the buffer,
9708 * 3) If there is more stuff in this buffer, use it else call read to fill it.
9709 * 4) Process input up to the next newline, deleting nul characters.
9711 //#define pgetc_debug(...) bb_error_msg(__VA_ARGS__)
9712 #define pgetc_debug(...) ((void)0)
9719 while (g_parsefile->strpush) {
9720 #if ENABLE_ASH_ALIAS
9721 if (g_parsefile->left_in_line == -1
9722 && g_parsefile->strpush->ap
9723 && g_parsefile->next_to_pgetc[-1] != ' '
9724 && g_parsefile->next_to_pgetc[-1] != '\t'
9726 pgetc_debug("preadbuffer PEOA");
9731 /* try "pgetc" now: */
9732 pgetc_debug("preadbuffer internal pgetc at %d:%p'%s'",
9733 g_parsefile->left_in_line,
9734 g_parsefile->next_to_pgetc,
9735 g_parsefile->next_to_pgetc);
9736 if (--g_parsefile->left_in_line >= 0)
9737 return (unsigned char)(*g_parsefile->next_to_pgetc++);
9739 /* on both branches above g_parsefile->left_in_line < 0.
9740 * "pgetc" needs refilling.
9743 /* -90 is our -BIGNUM. Below we use -99 to mark "EOF on read",
9744 * pungetc() may increment it a few times.
9745 * Assuming it won't increment it to less than -90.
9747 if (g_parsefile->left_in_line < -90 || g_parsefile->buf == NULL) {
9748 pgetc_debug("preadbuffer PEOF1");
9749 /* even in failure keep left_in_line and next_to_pgetc
9750 * in lock step, for correct multi-layer pungetc.
9751 * left_in_line was decremented before preadbuffer(),
9752 * must inc next_to_pgetc: */
9753 g_parsefile->next_to_pgetc++;
9757 more = g_parsefile->left_in_buffer;
9759 flush_stdout_stderr();
9763 /* don't try reading again */
9764 g_parsefile->left_in_line = -99;
9765 pgetc_debug("preadbuffer PEOF2");
9766 g_parsefile->next_to_pgetc++;
9771 /* Find out where's the end of line.
9772 * Set g_parsefile->left_in_line
9773 * and g_parsefile->left_in_buffer acordingly.
9774 * NUL chars are deleted.
9776 q = g_parsefile->next_to_pgetc;
9784 memmove(q, q + 1, more);
9788 g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1;
9794 g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1;
9795 if (g_parsefile->left_in_line < 0)
9800 g_parsefile->left_in_buffer = more;
9805 out2str(g_parsefile->next_to_pgetc);
9809 pgetc_debug("preadbuffer at %d:%p'%s'",
9810 g_parsefile->left_in_line,
9811 g_parsefile->next_to_pgetc,
9812 g_parsefile->next_to_pgetc);
9813 return (unsigned char)*g_parsefile->next_to_pgetc++;
9816 #define pgetc_as_macro() \
9817 (--g_parsefile->left_in_line >= 0 \
9818 ? (unsigned char)*g_parsefile->next_to_pgetc++ \
9825 pgetc_debug("pgetc_fast at %d:%p'%s'",
9826 g_parsefile->left_in_line,
9827 g_parsefile->next_to_pgetc,
9828 g_parsefile->next_to_pgetc);
9829 return pgetc_as_macro();
9832 #if ENABLE_ASH_OPTIMIZE_FOR_SIZE
9833 # define pgetc_fast() pgetc()
9835 # define pgetc_fast() pgetc_as_macro()
9838 #if ENABLE_ASH_ALIAS
9840 pgetc_without_PEOA(void)
9844 pgetc_debug("pgetc_fast at %d:%p'%s'",
9845 g_parsefile->left_in_line,
9846 g_parsefile->next_to_pgetc,
9847 g_parsefile->next_to_pgetc);
9849 } while (c == PEOA);
9853 # define pgetc_without_PEOA() pgetc()
9857 * Read a line from the script.
9860 pfgets(char *line, int len)
9866 while (--nleft > 0) {
9867 c = pgetc_without_PEOA();
9882 * Undo the last call to pgetc. Only one character may be pushed back.
9883 * PEOF may be pushed back.
9888 g_parsefile->left_in_line++;
9889 g_parsefile->next_to_pgetc--;
9890 pgetc_debug("pushed back to %d:%p'%s'",
9891 g_parsefile->left_in_line,
9892 g_parsefile->next_to_pgetc,
9893 g_parsefile->next_to_pgetc);
9897 * To handle the "." command, a stack of input files is used. Pushfile
9898 * adds a new entry to the stack and popfile restores the previous level.
9903 struct parsefile *pf;
9905 pf = ckzalloc(sizeof(*pf));
9906 pf->prev = g_parsefile;
9908 /*pf->strpush = NULL; - ckzalloc did it */
9909 /*pf->basestrpush.prev = NULL;*/
9916 struct parsefile *pf = g_parsefile;
9924 g_parsefile = pf->prev;
9930 * Return to top level.
9935 while (g_parsefile != &basepf)
9940 * Close the file(s) that the shell is reading commands from. Called
9941 * after a fork is done.
9947 if (g_parsefile->pf_fd > 0) {
9948 close(g_parsefile->pf_fd);
9949 g_parsefile->pf_fd = 0;
9954 * Like setinputfile, but takes an open file descriptor. Call this with
9958 setinputfd(int fd, int push)
9960 close_on_exec_on(fd);
9963 g_parsefile->buf = NULL;
9965 g_parsefile->pf_fd = fd;
9966 if (g_parsefile->buf == NULL)
9967 g_parsefile->buf = ckmalloc(IBUFSIZ);
9968 g_parsefile->left_in_buffer = 0;
9969 g_parsefile->left_in_line = 0;
9970 g_parsefile->linno = 1;
9974 * Set the input to take input from a file. If push is set, push the
9975 * old input onto the stack first.
9978 setinputfile(const char *fname, int flags)
9984 fd = open(fname, O_RDONLY);
9986 if (flags & INPUT_NOFILE_OK)
9988 ash_msg_and_raise_error("can't open '%s'", fname);
9991 fd2 = copyfd(fd, 10);
9994 ash_msg_and_raise_error("out of file descriptors");
9997 setinputfd(fd, flags & INPUT_PUSH_FILE);
10004 * Like setinputfile, but takes input from a string.
10007 setinputstring(char *string)
10011 g_parsefile->next_to_pgetc = string;
10012 g_parsefile->left_in_line = strlen(string);
10013 g_parsefile->buf = NULL;
10014 g_parsefile->linno = 1;
10019 /* ============ mail.c
10021 * Routines to check for mail.
10024 #if ENABLE_ASH_MAIL
10026 #define MAXMBOXES 10
10028 /* times of mailboxes */
10029 static time_t mailtime[MAXMBOXES];
10030 /* Set if MAIL or MAILPATH is changed. */
10031 static smallint mail_var_path_changed;
10034 * Print appropriate message(s) if mail has arrived.
10035 * If mail_var_path_changed is set,
10036 * then the value of MAIL has mail_var_path_changed,
10037 * so we just update the values.
10046 struct stackmark smark;
10049 setstackmark(&smark);
10050 mpath = mpathset() ? mpathval() : mailval();
10051 for (mtp = mailtime; mtp < mailtime + MAXMBOXES; mtp++) {
10052 p = path_advance(&mpath, nullstr);
10057 for (q = p; *q; q++)
10063 q[-1] = '\0'; /* delete trailing '/' */
10064 if (stat(p, &statb) < 0) {
10068 if (!mail_var_path_changed && statb.st_mtime != *mtp) {
10071 pathopt ? pathopt : "you have mail"
10074 *mtp = statb.st_mtime;
10076 mail_var_path_changed = 0;
10077 popstackmark(&smark);
10080 static void FAST_FUNC
10081 changemail(const char *val UNUSED_PARAM)
10083 mail_var_path_changed = 1;
10086 #endif /* ASH_MAIL */
10089 /* ============ ??? */
10092 * Set the shell parameters.
10095 setparam(char **argv)
10101 for (nparam = 0; argv[nparam]; nparam++)
10103 ap = newparam = ckmalloc((nparam + 1) * sizeof(*ap));
10105 *ap++ = ckstrdup(*argv++);
10108 freeparam(&shellparam);
10109 shellparam.malloced = 1;
10110 shellparam.nparam = nparam;
10111 shellparam.p = newparam;
10112 #if ENABLE_ASH_GETOPTS
10113 shellparam.optind = 1;
10114 shellparam.optoff = -1;
10119 * Process shell options. The global variable argptr contains a pointer
10120 * to the argument list; we advance it past the options.
10122 * SUSv3 section 2.8.1 "Consequences of Shell Errors" says:
10123 * For a non-interactive shell, an error condition encountered
10124 * by a special built-in ... shall cause the shell to write a diagnostic message
10125 * to standard error and exit as shown in the following table:
10126 * Error Special Built-In
10128 * Utility syntax error (option or operand error) Shall exit
10130 * However, in bug 1142 (http://busybox.net/bugs/view.php?id=1142)
10131 * we see that bash does not do that (set "finishes" with error code 1 instead,
10132 * and shell continues), and people rely on this behavior!
10134 * set -o barfoo 2>/dev/null
10137 * Oh well. Let's mimic that.
10140 plus_minus_o(char *name, int val)
10145 for (i = 0; i < NOPTS; i++) {
10146 if (strcmp(name, optnames(i)) == 0) {
10151 ash_msg("illegal option %co %s", val ? '-' : '+', name);
10154 for (i = 0; i < NOPTS; i++) {
10156 out1fmt("%-16s%s\n", optnames(i), optlist[i] ? "on" : "off");
10158 out1fmt("set %co %s\n", optlist[i] ? '-' : '+', optnames(i));
10164 setoption(int flag, int val)
10168 for (i = 0; i < NOPTS; i++) {
10169 if (optletters(i) == flag) {
10174 ash_msg_and_raise_error("illegal option %c%c", val ? '-' : '+', flag);
10178 options(int cmdline)
10186 while ((p = *argptr) != NULL) {
10188 if (c != '-' && c != '+')
10191 val = 0; /* val = 0 if c == '+' */
10194 if (p[0] == '\0' || LONE_DASH(p)) {
10196 /* "-" means turn off -x and -v */
10199 /* "--" means reset params */
10200 else if (*argptr == NULL)
10203 break; /* "-" or "--" terminates options */
10206 /* first char was + or - */
10207 while ((c = *p++) != '\0') {
10208 /* bash 3.2 indeed handles -c CMD and +c CMD the same */
10209 if (c == 'c' && cmdline) {
10210 minusc = p; /* command is after shell args */
10211 } else if (c == 'o') {
10212 if (plus_minus_o(*argptr, val)) {
10213 /* it already printed err message */
10214 return 1; /* error */
10218 } else if (cmdline && (c == 'l')) { /* -l or +l == --login */
10220 /* bash does not accept +-login, we also won't */
10221 } else if (cmdline && val && (c == '-')) { /* long options */
10222 if (strcmp(p, "login") == 0)
10234 * The shift builtin command.
10236 static int FAST_FUNC
10237 shiftcmd(int argc UNUSED_PARAM, char **argv)
10244 n = number(argv[1]);
10245 if (n > shellparam.nparam)
10246 n = 0; /* bash compat, was = shellparam.nparam; */
10248 shellparam.nparam -= n;
10249 for (ap1 = shellparam.p; --n >= 0; ap1++) {
10250 if (shellparam.malloced)
10253 ap2 = shellparam.p;
10254 while ((*ap2++ = *ap1++) != NULL)
10256 #if ENABLE_ASH_GETOPTS
10257 shellparam.optind = 1;
10258 shellparam.optoff = -1;
10265 * POSIX requires that 'set' (but not export or readonly) output the
10266 * variables in lexicographic order - by the locale's collating order (sigh).
10267 * Maybe we could keep them in an ordered balanced binary tree
10268 * instead of hashed lists.
10269 * For now just roll 'em through qsort for printing...
10272 showvars(const char *sep_prefix, int on, int off)
10275 char **ep, **epend;
10277 ep = listvars(on, off, &epend);
10278 qsort(ep, epend - ep, sizeof(char *), vpcmp);
10280 sep = *sep_prefix ? " " : sep_prefix;
10282 for (; ep < epend; ep++) {
10286 p = strchrnul(*ep, '=');
10289 q = single_quote(++p);
10290 out1fmt("%s%s%.*s%s\n", sep_prefix, sep, (int)(p - *ep), *ep, q);
10296 * The set command builtin.
10298 static int FAST_FUNC
10299 setcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
10304 return showvars(nullstr, 0, VUNSET);
10307 retval = options(/*cmdline:*/ 0);
10308 if (retval == 0) { /* if no parse error... */
10310 if (*argptr != NULL) {
10318 #if ENABLE_ASH_RANDOM_SUPPORT
10319 static void FAST_FUNC
10320 change_random(const char *value)
10324 if (value == NULL) {
10325 /* "get", generate */
10326 t = next_random(&random_gen);
10327 /* set without recursion */
10328 setvar(vrandom.var_text, utoa(t), VNOFUNC);
10329 vrandom.flags &= ~VNOFUNC;
10332 t = strtoul(value, NULL, 10);
10333 INIT_RANDOM_T(&random_gen, (t ? t : 1), t);
10338 #if ENABLE_ASH_GETOPTS
10340 getopts(char *optstr, char *optvar, char **optfirst, int *param_optind, int *optoff)
10349 if (*param_optind < 1)
10351 optnext = optfirst + *param_optind - 1;
10353 if (*param_optind <= 1 || *optoff < 0 || (int)strlen(optnext[-1]) < *optoff)
10356 p = optnext[-1] + *optoff;
10357 if (p == NULL || *p == '\0') {
10358 /* Current word is done, advance */
10360 if (p == NULL || *p != '-' || *++p == '\0') {
10367 if (LONE_DASH(p)) /* check for "--" */
10372 for (q = optstr; *q != c;) {
10374 if (optstr[0] == ':') {
10377 err |= setvarsafe("OPTARG", s, 0);
10379 fprintf(stderr, "Illegal option -%c\n", c);
10380 unsetvar("OPTARG");
10390 if (*p == '\0' && (p = *optnext) == NULL) {
10391 if (optstr[0] == ':') {
10394 err |= setvarsafe("OPTARG", s, 0);
10397 fprintf(stderr, "No arg for -%c option\n", c);
10398 unsetvar("OPTARG");
10406 err |= setvarsafe("OPTARG", p, 0);
10409 err |= setvarsafe("OPTARG", nullstr, 0);
10411 *optoff = p ? p - *(optnext - 1) : -1;
10412 *param_optind = optnext - optfirst + 1;
10413 fmtstr(s, sizeof(s), "%d", *param_optind);
10414 err |= setvarsafe("OPTIND", s, VNOFUNC);
10417 err |= setvarsafe(optvar, s, 0);
10421 flush_stdout_stderr();
10422 raise_exception(EXERROR);
10428 * The getopts builtin. Shellparam.optnext points to the next argument
10429 * to be processed. Shellparam.optptr points to the next character to
10430 * be processed in the current argument. If shellparam.optnext is NULL,
10431 * then it's the first time getopts has been called.
10433 static int FAST_FUNC
10434 getoptscmd(int argc, char **argv)
10439 ash_msg_and_raise_error("usage: getopts optstring var [arg]");
10441 optbase = shellparam.p;
10442 if (shellparam.optind > shellparam.nparam + 1) {
10443 shellparam.optind = 1;
10444 shellparam.optoff = -1;
10447 optbase = &argv[3];
10448 if (shellparam.optind > argc - 2) {
10449 shellparam.optind = 1;
10450 shellparam.optoff = -1;
10454 return getopts(argv[1], argv[2], optbase, &shellparam.optind,
10455 &shellparam.optoff);
10457 #endif /* ASH_GETOPTS */
10460 /* ============ Shell parser */
10463 struct heredoc *next; /* next here document in list */
10464 union node *here; /* redirection node */
10465 char *eofmark; /* string indicating end of input */
10466 smallint striptabs; /* if set, strip leading tabs */
10469 static smallint tokpushback; /* last token pushed back */
10470 static smallint parsebackquote; /* nonzero if we are inside backquotes */
10471 static smallint quoteflag; /* set if (part of) last token was quoted */
10472 static token_id_t lasttoken; /* last token read (integer id Txxx) */
10473 static struct heredoc *heredoclist; /* list of here documents to read */
10474 static char *wordtext; /* text of last word returned by readtoken */
10475 static struct nodelist *backquotelist;
10476 static union node *redirnode;
10477 static struct heredoc *heredoc;
10479 static const char *
10480 tokname(char *buf, int tok)
10483 return tokname_array[tok] + 1;
10484 sprintf(buf, "\"%s\"", tokname_array[tok] + 1);
10488 /* raise_error_unexpected_syntax:
10489 * Called when an unexpected token is read during the parse. The argument
10490 * is the token that is expected, or -1 if more than one type of token can
10491 * occur at this point.
10493 static void raise_error_unexpected_syntax(int) NORETURN;
10495 raise_error_unexpected_syntax(int token)
10501 l = sprintf(msg, "unexpected %s", tokname(buf, lasttoken));
10503 sprintf(msg + l, " (expecting %s)", tokname(buf, token));
10504 raise_error_syntax(msg);
10508 #define EOFMARKLEN 79
10510 /* parsing is heavily cross-recursive, need these forward decls */
10511 static union node *andor(void);
10512 static union node *pipeline(void);
10513 static union node *parse_command(void);
10514 static void parseheredoc(void);
10515 static char peektoken(void);
10516 static int readtoken(void);
10518 static union node *
10521 union node *n1, *n2, *n3;
10524 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10525 if (nlflag == 2 && peektoken())
10531 if (tok == TBACKGND) {
10532 if (n2->type == NPIPE) {
10533 n2->npipe.pipe_backgnd = 1;
10535 if (n2->type != NREDIR) {
10536 n3 = stzalloc(sizeof(struct nredir));
10538 /*n3->nredir.redirect = NULL; - stzalloc did it */
10541 n2->type = NBACKGND;
10547 n3 = stzalloc(sizeof(struct nbinary));
10549 n3->nbinary.ch1 = n1;
10550 n3->nbinary.ch2 = n2;
10566 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10574 pungetc(); /* push back EOF on input */
10578 raise_error_unexpected_syntax(-1);
10585 static union node *
10588 union node *n1, *n2, *n3;
10596 } else if (t == TOR) {
10602 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10604 n3 = stzalloc(sizeof(struct nbinary));
10606 n3->nbinary.ch1 = n1;
10607 n3->nbinary.ch2 = n2;
10612 static union node *
10615 union node *n1, *n2, *pipenode;
10616 struct nodelist *lp, *prev;
10620 TRACE(("pipeline: entered\n"));
10621 if (readtoken() == TNOT) {
10623 checkkwd = CHKKWD | CHKALIAS;
10626 n1 = parse_command();
10627 if (readtoken() == TPIPE) {
10628 pipenode = stzalloc(sizeof(struct npipe));
10629 pipenode->type = NPIPE;
10630 /*pipenode->npipe.pipe_backgnd = 0; - stzalloc did it */
10631 lp = stzalloc(sizeof(struct nodelist));
10632 pipenode->npipe.cmdlist = lp;
10636 lp = stzalloc(sizeof(struct nodelist));
10637 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10638 lp->n = parse_command();
10640 } while (readtoken() == TPIPE);
10646 n2 = stzalloc(sizeof(struct nnot));
10654 static union node *
10659 n = stzalloc(sizeof(struct narg));
10661 /*n->narg.next = NULL; - stzalloc did it */
10662 n->narg.text = wordtext;
10663 n->narg.backquote = backquotelist;
10668 fixredir(union node *n, const char *text, int err)
10672 TRACE(("Fix redir %s %d\n", text, err));
10674 n->ndup.vname = NULL;
10676 fd = bb_strtou(text, NULL, 10);
10677 if (!errno && fd >= 0)
10678 n->ndup.dupfd = fd;
10679 else if (LONE_DASH(text))
10680 n->ndup.dupfd = -1;
10683 raise_error_syntax("bad fd number");
10684 n->ndup.vname = makename();
10689 * Returns true if the text contains nothing to expand (no dollar signs
10693 noexpand(const char *text)
10697 while ((c = *text++) != '\0') {
10698 if (c == CTLQUOTEMARK)
10702 else if (SIT(c, BASESYNTAX) == CCTL)
10711 union node *n = redirnode;
10713 if (readtoken() != TWORD)
10714 raise_error_unexpected_syntax(-1);
10715 if (n->type == NHERE) {
10716 struct heredoc *here = heredoc;
10720 if (quoteflag == 0)
10722 TRACE(("Here document %d\n", n->type));
10723 if (!noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN)
10724 raise_error_syntax("illegal eof marker for << redirection");
10725 rmescapes(wordtext, 0);
10726 here->eofmark = wordtext;
10728 if (heredoclist == NULL)
10729 heredoclist = here;
10731 for (p = heredoclist; p->next; p = p->next)
10735 } else if (n->type == NTOFD || n->type == NFROMFD) {
10736 fixredir(n, wordtext, 0);
10738 n->nfile.fname = makename();
10742 static union node *
10745 union node *args, **app;
10746 union node *n = NULL;
10747 union node *vars, **vpp;
10748 union node **rpp, *redir;
10750 #if ENABLE_ASH_BASH_COMPAT
10751 smallint double_brackets_flag = 0;
10761 savecheckkwd = CHKALIAS;
10764 checkkwd = savecheckkwd;
10767 #if ENABLE_ASH_BASH_COMPAT
10768 case TAND: /* "&&" */
10769 case TOR: /* "||" */
10770 if (!double_brackets_flag) {
10774 wordtext = (char *) (t == TAND ? "-a" : "-o");
10777 n = stzalloc(sizeof(struct narg));
10779 /*n->narg.next = NULL; - stzalloc did it */
10780 n->narg.text = wordtext;
10781 #if ENABLE_ASH_BASH_COMPAT
10782 if (strcmp("[[", wordtext) == 0)
10783 double_brackets_flag = 1;
10784 else if (strcmp("]]", wordtext) == 0)
10785 double_brackets_flag = 0;
10787 n->narg.backquote = backquotelist;
10788 if (savecheckkwd && isassignment(wordtext)) {
10790 vpp = &n->narg.next;
10793 app = &n->narg.next;
10798 *rpp = n = redirnode;
10799 rpp = &n->nfile.next;
10800 parsefname(); /* read name of redirection file */
10803 if (args && app == &args->narg.next
10806 struct builtincmd *bcmd;
10809 /* We have a function */
10810 if (readtoken() != TRP)
10811 raise_error_unexpected_syntax(TRP);
10812 name = n->narg.text;
10813 if (!goodname(name)
10814 || ((bcmd = find_builtin(name)) && IS_BUILTIN_SPECIAL(bcmd))
10816 raise_error_syntax("bad function name");
10819 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10820 n->narg.next = parse_command();
10833 n = stzalloc(sizeof(struct ncmd));
10835 n->ncmd.args = args;
10836 n->ncmd.assign = vars;
10837 n->ncmd.redirect = redir;
10841 static union node *
10842 parse_command(void)
10844 union node *n1, *n2;
10845 union node *ap, **app;
10846 union node *cp, **cpp;
10847 union node *redir, **rpp;
10854 switch (readtoken()) {
10856 raise_error_unexpected_syntax(-1);
10859 n1 = stzalloc(sizeof(struct nif));
10861 n1->nif.test = list(0);
10862 if (readtoken() != TTHEN)
10863 raise_error_unexpected_syntax(TTHEN);
10864 n1->nif.ifpart = list(0);
10866 while (readtoken() == TELIF) {
10867 n2->nif.elsepart = stzalloc(sizeof(struct nif));
10868 n2 = n2->nif.elsepart;
10870 n2->nif.test = list(0);
10871 if (readtoken() != TTHEN)
10872 raise_error_unexpected_syntax(TTHEN);
10873 n2->nif.ifpart = list(0);
10875 if (lasttoken == TELSE)
10876 n2->nif.elsepart = list(0);
10878 n2->nif.elsepart = NULL;
10886 n1 = stzalloc(sizeof(struct nbinary));
10887 n1->type = (lasttoken == TWHILE) ? NWHILE : NUNTIL;
10888 n1->nbinary.ch1 = list(0);
10891 TRACE(("expecting DO got '%s' %s\n", tokname_array[got] + 1,
10892 got == TWORD ? wordtext : ""));
10893 raise_error_unexpected_syntax(TDO);
10895 n1->nbinary.ch2 = list(0);
10900 if (readtoken() != TWORD || quoteflag || !goodname(wordtext))
10901 raise_error_syntax("bad for loop variable");
10902 n1 = stzalloc(sizeof(struct nfor));
10904 n1->nfor.var = wordtext;
10905 checkkwd = CHKKWD | CHKALIAS;
10906 if (readtoken() == TIN) {
10908 while (readtoken() == TWORD) {
10909 n2 = stzalloc(sizeof(struct narg));
10911 /*n2->narg.next = NULL; - stzalloc did it */
10912 n2->narg.text = wordtext;
10913 n2->narg.backquote = backquotelist;
10915 app = &n2->narg.next;
10918 n1->nfor.args = ap;
10919 if (lasttoken != TNL && lasttoken != TSEMI)
10920 raise_error_unexpected_syntax(-1);
10922 n2 = stzalloc(sizeof(struct narg));
10924 /*n2->narg.next = NULL; - stzalloc did it */
10925 n2->narg.text = (char *)dolatstr;
10926 /*n2->narg.backquote = NULL;*/
10927 n1->nfor.args = n2;
10929 * Newline or semicolon here is optional (but note
10930 * that the original Bourne shell only allowed NL).
10932 if (lasttoken != TNL && lasttoken != TSEMI)
10935 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10936 if (readtoken() != TDO)
10937 raise_error_unexpected_syntax(TDO);
10938 n1->nfor.body = list(0);
10942 n1 = stzalloc(sizeof(struct ncase));
10944 if (readtoken() != TWORD)
10945 raise_error_unexpected_syntax(TWORD);
10946 n1->ncase.expr = n2 = stzalloc(sizeof(struct narg));
10948 /*n2->narg.next = NULL; - stzalloc did it */
10949 n2->narg.text = wordtext;
10950 n2->narg.backquote = backquotelist;
10952 checkkwd = CHKKWD | CHKALIAS;
10953 } while (readtoken() == TNL);
10954 if (lasttoken != TIN)
10955 raise_error_unexpected_syntax(TIN);
10956 cpp = &n1->ncase.cases;
10958 checkkwd = CHKNL | CHKKWD;
10960 while (t != TESAC) {
10961 if (lasttoken == TLP)
10963 *cpp = cp = stzalloc(sizeof(struct nclist));
10965 app = &cp->nclist.pattern;
10967 *app = ap = stzalloc(sizeof(struct narg));
10969 /*ap->narg.next = NULL; - stzalloc did it */
10970 ap->narg.text = wordtext;
10971 ap->narg.backquote = backquotelist;
10972 if (readtoken() != TPIPE)
10974 app = &ap->narg.next;
10977 //ap->narg.next = NULL;
10978 if (lasttoken != TRP)
10979 raise_error_unexpected_syntax(TRP);
10980 cp->nclist.body = list(2);
10982 cpp = &cp->nclist.next;
10984 checkkwd = CHKNL | CHKKWD;
10988 raise_error_unexpected_syntax(TENDCASE);
10995 n1 = stzalloc(sizeof(struct nredir));
10996 n1->type = NSUBSHELL;
10997 n1->nredir.n = list(0);
10998 /*n1->nredir.redirect = NULL; - stzalloc did it */
11008 return simplecmd();
11011 if (readtoken() != t)
11012 raise_error_unexpected_syntax(t);
11015 /* Now check for redirection which may follow command */
11016 checkkwd = CHKKWD | CHKALIAS;
11018 while (readtoken() == TREDIR) {
11019 *rpp = n2 = redirnode;
11020 rpp = &n2->nfile.next;
11026 if (n1->type != NSUBSHELL) {
11027 n2 = stzalloc(sizeof(struct nredir));
11032 n1->nredir.redirect = redir;
11037 #if ENABLE_ASH_BASH_COMPAT
11038 static int decode_dollar_squote(void)
11040 static const char C_escapes[] ALIGN1 = "nrbtfav""x\\01234567";
11046 p = strchr(C_escapes, c);
11051 if ((unsigned char)(c - '0') <= 7) { /* \ooo */
11055 } while ((unsigned char)(c - '0') <= 7 && --cnt);
11057 } else if (c == 'x') { /* \xHH */
11061 } while (isxdigit(c) && --cnt);
11063 if (cnt == 3) { /* \x but next char is "bad" */
11067 } else { /* simple seq like \\ or \t */
11072 c = bb_process_escape_sequence((void*)&p);
11073 } else { /* unrecognized "\z": print both chars unless ' or " */
11074 if (c != '\'' && c != '"') {
11076 c |= 0x100; /* "please encode \, then me" */
11084 * If eofmark is NULL, read a word or a redirection symbol. If eofmark
11085 * is not NULL, read a here document. In the latter case, eofmark is the
11086 * word which marks the end of the document and striptabs is true if
11087 * leading tabs should be stripped from the document. The argument c
11088 * is the first character of the input token or document.
11090 * Because C does not have internal subroutines, I have simulated them
11091 * using goto's to implement the subroutine linkage. The following macros
11092 * will run code that appears at the end of readtoken1.
11094 #define CHECKEND() {goto checkend; checkend_return:;}
11095 #define PARSEREDIR() {goto parseredir; parseredir_return:;}
11096 #define PARSESUB() {goto parsesub; parsesub_return:;}
11097 #define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;}
11098 #define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;}
11099 #define PARSEARITH() {goto parsearith; parsearith_return:;}
11101 readtoken1(int c, int syntax, char *eofmark, int striptabs)
11103 /* NB: syntax parameter fits into smallint */
11104 /* c parameter is an unsigned char or PEOF or PEOA */
11107 char line[EOFMARKLEN + 1];
11108 struct nodelist *bqlist;
11112 smallint prevsyntax; /* syntax before arithmetic */
11113 #if ENABLE_ASH_EXPAND_PRMT
11114 smallint pssyntax; /* we are expanding a prompt string */
11116 int varnest; /* levels of variables expansion */
11117 int arinest; /* levels of arithmetic expansion */
11118 int parenlevel; /* levels of parens in arithmetic */
11119 int dqvarnest; /* levels of variables expansion within double quotes */
11121 IF_ASH_BASH_COMPAT(smallint bash_dollar_squote = 0;)
11124 /* Avoid longjmp clobbering */
11130 (void) &parenlevel;
11133 (void) &prevsyntax;
11136 startlinno = g_parsefile->linno;
11140 #if ENABLE_ASH_EXPAND_PRMT
11141 pssyntax = (syntax == PSSYNTAX);
11145 dblquote = (syntax == DQSYNTAX);
11151 STARTSTACKSTR(out);
11153 /* For each line, until end of word */
11154 CHECKEND(); /* set c to PEOF if at end of here document */
11155 for (;;) { /* until end of line or end of word */
11156 CHECKSTRSPACE(4, out); /* permit 4 calls to USTPUTC */
11157 switch (SIT(c, syntax)) {
11158 case CNL: /* '\n' */
11159 if (syntax == BASESYNTAX)
11160 goto endword; /* exit outer loop */
11162 g_parsefile->linno++;
11163 setprompt_if(doprompt, 2);
11165 goto loop; /* continue outer loop */
11170 if (eofmark == NULL || dblquote)
11171 USTPUTC(CTLESC, out);
11172 #if ENABLE_ASH_BASH_COMPAT
11173 if (c == '\\' && bash_dollar_squote) {
11174 c = decode_dollar_squote();
11176 USTPUTC('\\', out);
11177 c = (unsigned char)c;
11183 case CBACK: /* backslash */
11184 c = pgetc_without_PEOA();
11186 USTPUTC(CTLESC, out);
11187 USTPUTC('\\', out);
11189 } else if (c == '\n') {
11190 setprompt_if(doprompt, 2);
11192 #if ENABLE_ASH_EXPAND_PRMT
11193 if (c == '$' && pssyntax) {
11194 USTPUTC(CTLESC, out);
11195 USTPUTC('\\', out);
11198 /* Backslash is retained if we are in "str" and next char isn't special */
11203 && (c != '"' || eofmark != NULL)
11205 USTPUTC(CTLESC, out);
11206 USTPUTC('\\', out);
11208 if (SIT(c, SQSYNTAX) == CCTL)
11209 USTPUTC(CTLESC, out);
11217 if (eofmark == NULL) {
11218 USTPUTC(CTLQUOTEMARK, out);
11226 IF_ASH_BASH_COMPAT(bash_dollar_squote = 0;)
11227 if (eofmark != NULL && arinest == 0
11232 if (dqvarnest == 0) {
11233 syntax = BASESYNTAX;
11240 case CVAR: /* '$' */
11241 PARSESUB(); /* parse substitution */
11243 case CENDVAR: /* '}' */
11246 if (dqvarnest > 0) {
11253 #if ENABLE_SH_MATH_SUPPORT
11254 case CLP: /* '(' in arithmetic */
11258 case CRP: /* ')' in arithmetic */
11259 if (parenlevel > 0) {
11262 if (pgetc() == ')') {
11263 if (--arinest == 0) {
11264 syntax = prevsyntax;
11265 dblquote = (syntax == DQSYNTAX);
11270 * unbalanced parens
11271 * (don't 2nd guess - no error)
11279 case CBQUOTE: /* '`' */
11283 goto endword; /* exit outer loop */
11287 if (varnest == 0) {
11288 #if ENABLE_ASH_BASH_COMPAT
11290 if (pgetc() == '>')
11291 c = 0x100 + '>'; /* flag &> */
11295 goto endword; /* exit outer loop */
11297 IF_ASH_ALIAS(if (c != PEOA))
11304 #if ENABLE_SH_MATH_SUPPORT
11305 if (syntax == ARISYNTAX)
11306 raise_error_syntax("missing '))'");
11308 if (syntax != BASESYNTAX && !parsebackquote && eofmark == NULL)
11309 raise_error_syntax("unterminated quoted string");
11310 if (varnest != 0) {
11311 startlinno = g_parsefile->linno;
11313 raise_error_syntax("missing '}'");
11315 USTPUTC('\0', out);
11316 len = out - (char *)stackblock();
11317 out = stackblock();
11318 if (eofmark == NULL) {
11319 if ((c == '>' || c == '<' IF_ASH_BASH_COMPAT( || c == 0x100 + '>'))
11322 if (isdigit_str9(out)) {
11323 PARSEREDIR(); /* passed as params: out, c */
11324 lasttoken = TREDIR;
11327 /* else: non-number X seen, interpret it
11328 * as "NNNX>file" = "NNNX >file" */
11332 quoteflag = quotef;
11333 backquotelist = bqlist;
11334 grabstackblock(len);
11338 /* end of readtoken routine */
11341 * Check to see whether we are at the end of the here document. When this
11342 * is called, c is set to the first character of the next input line. If
11343 * we are at the end of the here document, this routine sets the c to PEOF.
11347 #if ENABLE_ASH_ALIAS
11349 c = pgetc_without_PEOA();
11352 while (c == '\t') {
11353 c = pgetc_without_PEOA();
11356 if (c == *eofmark) {
11357 if (pfgets(line, sizeof(line)) != NULL) {
11361 for (q = eofmark + 1; *q && *p == *q; p++, q++)
11363 if (*p == '\n' && *q == '\0') {
11365 g_parsefile->linno++;
11366 needprompt = doprompt;
11368 pushstring(line, NULL);
11373 goto checkend_return;
11377 * Parse a redirection operator. The variable "out" points to a string
11378 * specifying the fd to be redirected. The variable "c" contains the
11379 * first character of the redirection operator.
11382 /* out is already checked to be a valid number or "" */
11383 int fd = (*out == '\0' ? -1 : atoi(out));
11386 np = stzalloc(sizeof(struct nfile));
11391 np->type = NAPPEND;
11393 np->type = NCLOBBER;
11396 /* it also can be NTO2 (>&file), but we can't figure it out yet */
11402 #if ENABLE_ASH_BASH_COMPAT
11403 else if (c == 0x100 + '>') { /* this flags &> redirection */
11405 pgetc(); /* this is '>', no need to check */
11409 else { /* c == '<' */
11410 /*np->nfile.fd = 0; - stzalloc did it */
11414 if (sizeof(struct nfile) != sizeof(struct nhere)) {
11415 np = stzalloc(sizeof(struct nhere));
11416 /*np->nfile.fd = 0; - stzalloc did it */
11419 heredoc = stzalloc(sizeof(struct heredoc));
11420 heredoc->here = np;
11423 heredoc->striptabs = 1;
11425 /*heredoc->striptabs = 0; - stzalloc did it */
11431 np->type = NFROMFD;
11435 np->type = NFROMTO;
11447 goto parseredir_return;
11451 * Parse a substitution. At this point, we have read the dollar sign
11452 * and nothing else.
11455 /* is_special(c) evaluates to 1 for c in "!#$*-0123456789?@"; 0 otherwise
11456 * (assuming ascii char codes, as the original implementation did) */
11457 #define is_special(c) \
11458 (((unsigned)(c) - 33 < 32) \
11459 && ((0xc1ff920dU >> ((unsigned)(c) - 33)) & 1))
11461 unsigned char subtype;
11466 if (c > 255 /* PEOA or PEOF */
11467 || (c != '(' && c != '{' && !is_name(c) && !is_special(c))
11469 #if ENABLE_ASH_BASH_COMPAT
11471 bash_dollar_squote = 1;
11476 } else if (c == '(') {
11477 /* $(command) or $((arith)) */
11478 if (pgetc() == '(') {
11479 #if ENABLE_SH_MATH_SUPPORT
11482 raise_error_syntax("you disabled math support for $((arith)) syntax");
11489 /* $VAR, $<specialchar>, ${...}, or PEOA/PEOF */
11490 USTPUTC(CTLVAR, out);
11491 typeloc = out - (char *)stackblock();
11492 USTPUTC(VSNORMAL, out);
11493 subtype = VSNORMAL;
11499 c = '#'; /* ${#} - same as $# */
11501 subtype = VSLENGTH; /* ${#VAR} */
11506 if (c <= 255 /* not PEOA or PEOF */ && is_name(c)) {
11507 /* $[{[#]]NAME[}] */
11511 } while (c <= 255 /* not PEOA or PEOF */ && is_in_name(c));
11512 } else if (isdigit(c)) {
11513 /* $[{[#]]NUM[}] */
11517 } while (isdigit(c));
11518 } else if (is_special(c)) {
11519 /* $[{[#]]<specialchar>[}] */
11524 raise_error_syntax("bad substitution");
11526 if (c != '}' && subtype == VSLENGTH) {
11527 /* ${#VAR didn't end with } */
11533 if (subtype == 0) {
11534 /* ${VAR...} but not $VAR or ${#VAR} */
11535 /* c == first char after VAR */
11539 #if ENABLE_ASH_BASH_COMPAT
11540 if (c == ':' || c == '$' || isdigit(c)) {
11541 //TODO: support more general format ${v:EXPR:EXPR},
11542 // where EXPR follows $(()) rules
11543 subtype = VSSUBSTR;
11545 break; /* "goto do_pungetc" is bigger (!) */
11551 static const char types[] ALIGN1 = "}-+?=";
11552 const char *p = strchr(types, c);
11555 subtype = p - types + VSNORMAL;
11561 subtype = (c == '#' ? VSTRIMLEFT : VSTRIMRIGHT);
11568 #if ENABLE_ASH_BASH_COMPAT
11570 /* ${v/[/]pattern/repl} */
11571 //TODO: encode pattern and repl separately.
11572 // Currently ${v/$var_with_slash/repl} is horribly broken
11573 subtype = VSREPLACE;
11577 subtype++; /* VSREPLACEALL */
11585 if (dblquote || arinest)
11587 ((unsigned char *)stackblock())[typeloc] = subtype | flags;
11588 if (subtype != VSNORMAL) {
11590 if (dblquote || arinest) {
11595 goto parsesub_return;
11599 * Called to parse command substitutions. Newstyle is set if the command
11600 * is enclosed inside $(...); nlpp is a pointer to the head of the linked
11601 * list of commands (passed by reference), and savelen is the number of
11602 * characters on the top of the stack which must be preserved.
11605 struct nodelist **nlpp;
11608 char *volatile str;
11609 struct jmploc jmploc;
11610 struct jmploc *volatile savehandler;
11612 smallint saveprompt = 0;
11615 (void) &saveprompt;
11617 savepbq = parsebackquote;
11618 if (setjmp(jmploc.loc)) {
11620 parsebackquote = 0;
11621 exception_handler = savehandler;
11622 longjmp(exception_handler->loc, 1);
11626 savelen = out - (char *)stackblock();
11628 str = ckmalloc(savelen);
11629 memcpy(str, stackblock(), savelen);
11631 savehandler = exception_handler;
11632 exception_handler = &jmploc;
11635 /* We must read until the closing backquote, giving special
11636 treatment to some slashes, and then push the string and
11637 reread it as input, interpreting it normally. */
11642 STARTSTACKSTR(pout);
11646 setprompt_if(needprompt, 2);
11655 g_parsefile->linno++;
11656 setprompt_if(doprompt, 2);
11658 * If eating a newline, avoid putting
11659 * the newline into the new character
11660 * stream (via the STPUTC after the
11665 if (pc != '\\' && pc != '`' && pc != '$'
11666 && (!dblquote || pc != '"')
11668 STPUTC('\\', pout);
11670 if (pc <= 255 /* not PEOA or PEOF */) {
11676 IF_ASH_ALIAS(case PEOA:)
11677 startlinno = g_parsefile->linno;
11678 raise_error_syntax("EOF in backquote substitution");
11681 g_parsefile->linno++;
11682 needprompt = doprompt;
11691 STPUTC('\0', pout);
11692 psavelen = pout - (char *)stackblock();
11693 if (psavelen > 0) {
11694 pstr = grabstackstr(pout);
11695 setinputstring(pstr);
11700 nlpp = &(*nlpp)->next;
11701 *nlpp = stzalloc(sizeof(**nlpp));
11702 /* (*nlpp)->next = NULL; - stzalloc did it */
11703 parsebackquote = oldstyle;
11706 saveprompt = doprompt;
11713 doprompt = saveprompt;
11714 else if (readtoken() != TRP)
11715 raise_error_unexpected_syntax(TRP);
11720 * Start reading from old file again, ignoring any pushed back
11721 * tokens left from the backquote parsing
11726 while (stackblocksize() <= savelen)
11728 STARTSTACKSTR(out);
11730 memcpy(out, str, savelen);
11731 STADJUST(savelen, out);
11737 parsebackquote = savepbq;
11738 exception_handler = savehandler;
11739 if (arinest || dblquote)
11740 USTPUTC(CTLBACKQ | CTLQUOTE, out);
11742 USTPUTC(CTLBACKQ, out);
11744 goto parsebackq_oldreturn;
11745 goto parsebackq_newreturn;
11748 #if ENABLE_SH_MATH_SUPPORT
11750 * Parse an arithmetic expansion (indicate start of one and set state)
11753 if (++arinest == 1) {
11754 prevsyntax = syntax;
11755 syntax = ARISYNTAX;
11756 USTPUTC(CTLARI, out);
11763 * we collapse embedded arithmetic expansion to
11764 * parenthesis, which should be equivalent
11768 goto parsearith_return;
11772 } /* end of readtoken */
11775 * Read the next input token.
11776 * If the token is a word, we set backquotelist to the list of cmds in
11777 * backquotes. We set quoteflag to true if any part of the word was
11779 * If the token is TREDIR, then we set redirnode to a structure containing
11781 * In all cases, the variable startlinno is set to the number of the line
11782 * on which the token starts.
11784 * [Change comment: here documents and internal procedures]
11785 * [Readtoken shouldn't have any arguments. Perhaps we should make the
11786 * word parsing code into a separate routine. In this case, readtoken
11787 * doesn't need to have any internal procedures, but parseword does.
11788 * We could also make parseoperator in essence the main routine, and
11789 * have parseword (readtoken1?) handle both words and redirection.]
11791 #define NEW_xxreadtoken
11792 #ifdef NEW_xxreadtoken
11793 /* singles must be first! */
11794 static const char xxreadtoken_chars[7] ALIGN1 = {
11795 '\n', '(', ')', /* singles */
11796 '&', '|', ';', /* doubles */
11800 #define xxreadtoken_singles 3
11801 #define xxreadtoken_doubles 3
11803 static const char xxreadtoken_tokens[] ALIGN1 = {
11804 TNL, TLP, TRP, /* only single occurrence allowed */
11805 TBACKGND, TPIPE, TSEMI, /* if single occurrence */
11806 TEOF, /* corresponds to trailing nul */
11807 TAND, TOR, TENDCASE /* if double occurrence */
11819 setprompt_if(needprompt, 2);
11820 startlinno = g_parsefile->linno;
11821 for (;;) { /* until token or start of word found */
11823 if (c == ' ' || c == '\t' IF_ASH_ALIAS( || c == PEOA))
11827 while ((c = pgetc()) != '\n' && c != PEOF)
11830 } else if (c == '\\') {
11831 if (pgetc() != '\n') {
11833 break; /* return readtoken1(...) */
11835 startlinno = ++g_parsefile->linno;
11836 setprompt_if(doprompt, 2);
11840 p = xxreadtoken_chars + sizeof(xxreadtoken_chars) - 1;
11843 g_parsefile->linno++;
11844 needprompt = doprompt;
11847 p = strchr(xxreadtoken_chars, c);
11849 break; /* return readtoken1(...) */
11851 if ((int)(p - xxreadtoken_chars) >= xxreadtoken_singles) {
11853 if (cc == c) { /* double occurrence? */
11854 p += xxreadtoken_doubles + 1;
11857 #if ENABLE_ASH_BASH_COMPAT
11858 if (c == '&' && cc == '>') /* &> */
11859 break; /* return readtoken1(...) */
11864 lasttoken = xxreadtoken_tokens[p - xxreadtoken_chars];
11869 return readtoken1(c, BASESYNTAX, (char *) NULL, 0);
11871 #else /* old xxreadtoken */
11872 #define RETURN(token) return lasttoken = token
11882 setprompt_if(needprompt, 2);
11883 startlinno = g_parsefile->linno;
11884 for (;;) { /* until token or start of word found */
11887 case ' ': case '\t':
11888 IF_ASH_ALIAS(case PEOA:)
11891 while ((c = pgetc()) != '\n' && c != PEOF)
11896 if (pgetc() == '\n') {
11897 startlinno = ++g_parsefile->linno;
11898 setprompt_if(doprompt, 2);
11904 g_parsefile->linno++;
11905 needprompt = doprompt;
11910 if (pgetc() == '&')
11915 if (pgetc() == '|')
11920 if (pgetc() == ';')
11933 return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
11936 #endif /* old xxreadtoken */
11943 smallint alreadyseen = tokpushback;
11946 #if ENABLE_ASH_ALIAS
11955 if (checkkwd & CHKNL) {
11962 if (t != TWORD || quoteflag) {
11967 * check for keywords
11969 if (checkkwd & CHKKWD) {
11970 const char *const *pp;
11972 pp = findkwd(wordtext);
11974 lasttoken = t = pp - tokname_array;
11975 TRACE(("keyword '%s' recognized\n", tokname_array[t] + 1));
11980 if (checkkwd & CHKALIAS) {
11981 #if ENABLE_ASH_ALIAS
11983 ap = lookupalias(wordtext, 1);
11986 pushstring(ap->val, ap);
11996 TRACE(("token '%s' %s\n", tokname_array[t] + 1, t == TWORD ? wordtext : ""));
11998 TRACE(("reread token '%s' %s\n", tokname_array[t] + 1, t == TWORD ? wordtext : ""));
12010 return tokname_array[t][0];
12014 * Read and parse a command. Returns NODE_EOF on end of file.
12015 * (NULL is a valid parse tree indicating a blank line.)
12017 static union node *
12018 parsecmd(int interact)
12023 doprompt = interact;
12024 setprompt_if(doprompt, doprompt);
12036 * Input any here documents.
12041 struct heredoc *here;
12044 here = heredoclist;
12045 heredoclist = NULL;
12048 setprompt_if(needprompt, 2);
12049 readtoken1(pgetc(), here->here->type == NHERE ? SQSYNTAX : DQSYNTAX,
12050 here->eofmark, here->striptabs);
12051 n = stzalloc(sizeof(struct narg));
12052 n->narg.type = NARG;
12053 /*n->narg.next = NULL; - stzalloc did it */
12054 n->narg.text = wordtext;
12055 n->narg.backquote = backquotelist;
12056 here->here->nhere.doc = n;
12063 * called by editline -- any expansions to the prompt should be added here.
12065 #if ENABLE_ASH_EXPAND_PRMT
12066 static const char *
12067 expandstr(const char *ps)
12071 /* XXX Fix (char *) cast. It _is_ a bug. ps is variable's value,
12072 * and token processing _can_ alter it (delete NULs etc). */
12073 setinputstring((char *)ps);
12074 readtoken1(pgetc(), PSSYNTAX, nullstr, 0);
12077 n.narg.type = NARG;
12078 n.narg.next = NULL;
12079 n.narg.text = wordtext;
12080 n.narg.backquote = backquotelist;
12082 expandarg(&n, NULL, 0);
12083 return stackblock();
12088 * Execute a command or commands contained in a string.
12091 evalstring(char *s, int mask)
12094 struct stackmark smark;
12098 setstackmark(&smark);
12101 while ((n = parsecmd(0)) != NODE_EOF) {
12103 popstackmark(&smark);
12116 * The eval command.
12118 static int FAST_FUNC
12119 evalcmd(int argc UNUSED_PARAM, char **argv)
12128 STARTSTACKSTR(concat);
12130 concat = stack_putstr(p, concat);
12134 STPUTC(' ', concat);
12136 STPUTC('\0', concat);
12137 p = grabstackstr(concat);
12139 evalstring(p, ~SKIPEVAL);
12145 * Read and execute commands.
12146 * "Top" is nonzero for the top level command loop;
12147 * it turns on prompting if the shell is interactive.
12153 struct stackmark smark;
12157 TRACE(("cmdloop(%d) called\n", top));
12161 setstackmark(&smark);
12164 showjobs(stderr, SHOW_CHANGED);
12167 if (iflag && top) {
12171 n = parsecmd(inter);
12173 if (DEBUG > 2 && debug && (n != NODE_EOF))
12176 if (n == NODE_EOF) {
12177 if (!top || numeof >= 50)
12179 if (!stoppedjobs()) {
12182 out2str("\nUse \"exit\" to leave shell.\n");
12185 } else if (nflag == 0) {
12186 /* job_warning can only be 2,1,0. Here 2->1, 1/0->0 */
12191 popstackmark(&smark);
12196 return skip & SKIPEVAL;
12203 * Take commands from a file. To be compatible we should do a path
12204 * search for the file, which is necessary to find sub-commands.
12207 find_dot_file(char *name)
12210 const char *path = pathval();
12213 /* don't try this for absolute or relative paths */
12214 if (strchr(name, '/'))
12217 /* IIRC standards do not say whether . is to be searched.
12218 * And it is even smaller this way, making it unconditional for now:
12220 if (1) { /* ENABLE_ASH_BASH_COMPAT */
12225 while ((fullname = path_advance(&path, name)) != NULL) {
12227 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
12229 * Don't bother freeing here, since it will
12230 * be freed by the caller.
12234 if (fullname != name)
12235 stunalloc(fullname);
12238 /* not found in the PATH */
12239 ash_msg_and_raise_error("%s: not found", name);
12243 static int FAST_FUNC
12244 dotcmd(int argc, char **argv)
12247 struct strlist *sp;
12248 volatile struct shparam saveparam;
12250 for (sp = cmdenviron; sp; sp = sp->next)
12251 setvareq(ckstrdup(sp->text), VSTRFIXED | VTEXTFIXED);
12254 /* bash says: "bash: .: filename argument required" */
12255 return 2; /* bash compat */
12258 /* "false; . empty_file; echo $?" should print 0, not 1: */
12261 fullname = find_dot_file(argv[1]);
12265 if (argc) { /* argc > 0, argv[0] != NULL */
12266 saveparam = shellparam;
12267 shellparam.malloced = 0;
12268 shellparam.nparam = argc;
12269 shellparam.p = argv;
12272 setinputfile(fullname, INPUT_PUSH_FILE);
12273 commandname = fullname;
12278 freeparam(&shellparam);
12279 shellparam = saveparam;
12285 static int FAST_FUNC
12286 exitcmd(int argc UNUSED_PARAM, char **argv)
12291 exitstatus = number(argv[1]);
12292 raise_exception(EXEXIT);
12297 * Read a file containing shell functions.
12300 readcmdfile(char *name)
12302 setinputfile(name, INPUT_PUSH_FILE);
12308 /* ============ find_command inplementation */
12311 * Resolve a command name. If you change this routine, you may have to
12312 * change the shellexec routine as well.
12315 find_command(char *name, struct cmdentry *entry, int act, const char *path)
12317 struct tblentry *cmdp;
12324 struct builtincmd *bcmd;
12326 /* If name contains a slash, don't use PATH or hash table */
12327 if (strchr(name, '/') != NULL) {
12328 entry->u.index = -1;
12329 if (act & DO_ABS) {
12330 while (stat(name, &statb) < 0) {
12332 if (errno == EINTR)
12335 entry->cmdtype = CMDUNKNOWN;
12339 entry->cmdtype = CMDNORMAL;
12343 /* #if ENABLE_FEATURE_SH_STANDALONE... moved after builtin check */
12345 updatetbl = (path == pathval());
12348 if (strstr(path, "%builtin") != NULL)
12349 act |= DO_ALTBLTIN;
12352 /* If name is in the table, check answer will be ok */
12353 cmdp = cmdlookup(name, 0);
12354 if (cmdp != NULL) {
12357 switch (cmdp->cmdtype) {
12375 } else if (cmdp->rehash == 0)
12376 /* if not invalidated by cd, we're done */
12380 /* If %builtin not in path, check for builtin next */
12381 bcmd = find_builtin(name);
12383 if (IS_BUILTIN_REGULAR(bcmd))
12384 goto builtin_success;
12385 if (act & DO_ALTPATH) {
12386 if (!(act & DO_ALTBLTIN))
12387 goto builtin_success;
12388 } else if (builtinloc <= 0) {
12389 goto builtin_success;
12393 #if ENABLE_FEATURE_SH_STANDALONE
12395 int applet_no = find_applet_by_name(name);
12396 if (applet_no >= 0) {
12397 entry->cmdtype = CMDNORMAL;
12398 entry->u.index = -2 - applet_no;
12404 /* We have to search path. */
12405 prev = -1; /* where to start */
12406 if (cmdp && cmdp->rehash) { /* doing a rehash */
12407 if (cmdp->cmdtype == CMDBUILTIN)
12410 prev = cmdp->param.index;
12416 while ((fullname = path_advance(&path, name)) != NULL) {
12417 stunalloc(fullname);
12418 /* NB: code below will still use fullname
12419 * despite it being "unallocated" */
12422 if (prefix(pathopt, "builtin")) {
12424 goto builtin_success;
12427 if ((act & DO_NOFUNC)
12428 || !prefix(pathopt, "func")
12429 ) { /* ignore unimplemented options */
12433 /* if rehash, don't redo absolute path names */
12434 if (fullname[0] == '/' && idx <= prev) {
12437 TRACE(("searchexec \"%s\": no change\n", name));
12440 while (stat(fullname, &statb) < 0) {
12442 if (errno == EINTR)
12445 if (errno != ENOENT && errno != ENOTDIR)
12449 e = EACCES; /* if we fail, this will be the error */
12450 if (!S_ISREG(statb.st_mode))
12452 if (pathopt) { /* this is a %func directory */
12453 stalloc(strlen(fullname) + 1);
12454 /* NB: stalloc will return space pointed by fullname
12455 * (because we don't have any intervening allocations
12456 * between stunalloc above and this stalloc) */
12457 readcmdfile(fullname);
12458 cmdp = cmdlookup(name, 0);
12459 if (cmdp == NULL || cmdp->cmdtype != CMDFUNCTION)
12460 ash_msg_and_raise_error("%s not defined in %s", name, fullname);
12461 stunalloc(fullname);
12464 TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
12466 entry->cmdtype = CMDNORMAL;
12467 entry->u.index = idx;
12471 cmdp = cmdlookup(name, 1);
12472 cmdp->cmdtype = CMDNORMAL;
12473 cmdp->param.index = idx;
12478 /* We failed. If there was an entry for this command, delete it */
12479 if (cmdp && updatetbl)
12480 delete_cmd_entry();
12482 ash_msg("%s: %s", name, errmsg(e, "not found"));
12483 entry->cmdtype = CMDUNKNOWN;
12488 entry->cmdtype = CMDBUILTIN;
12489 entry->u.cmd = bcmd;
12493 cmdp = cmdlookup(name, 1);
12494 cmdp->cmdtype = CMDBUILTIN;
12495 cmdp->param.cmd = bcmd;
12499 entry->cmdtype = cmdp->cmdtype;
12500 entry->u = cmdp->param;
12504 /* ============ trap.c */
12507 * The trap builtin.
12509 static int FAST_FUNC
12510 trapcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12514 int signo, exitcode;
12519 for (signo = 0; signo < NSIG; signo++) {
12520 char *tr = trap_ptr[signo];
12522 /* note: bash adds "SIG", but only if invoked
12523 * as "bash". If called as "sh", or if set -o posix,
12524 * then it prints short signal names.
12525 * We are printing short names: */
12526 out1fmt("trap -- %s %s\n",
12528 get_signame(signo));
12529 /* trap_ptr != trap only if we are in special-cased `trap` code.
12530 * In this case, we will exit very soon, no need to free(). */
12531 /* if (trap_ptr != trap && tp[0]) */
12536 if (trap_ptr != trap) {
12549 signo = get_signum(*ap);
12551 /* Mimic bash message exactly */
12552 ash_msg("%s: invalid signal specification", *ap);
12558 if (LONE_DASH(action))
12561 action = ckstrdup(action);
12565 may_have_traps = 1;
12566 trap[signo] = action;
12577 /* ============ Builtins */
12579 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
12581 * Lists available builtins
12583 static int FAST_FUNC
12584 helpcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12590 "Built-in commands:\n"
12591 "------------------\n");
12592 for (col = 0, i = 0; i < ARRAY_SIZE(builtintab); i++) {
12593 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '),
12594 builtintab[i].name + 1);
12600 #if ENABLE_FEATURE_SH_STANDALONE
12602 const char *a = applet_names;
12604 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '), a);
12609 a += strlen(a) + 1;
12614 return EXIT_SUCCESS;
12616 #endif /* FEATURE_SH_EXTRA_QUIET */
12619 * The export and readonly commands.
12621 static int FAST_FUNC
12622 exportcmd(int argc UNUSED_PARAM, char **argv)
12628 int flag = argv[0][0] == 'r' ? VREADONLY : VEXPORT;
12630 if (nextopt("p") != 'p') {
12635 p = strchr(name, '=');
12639 vp = *findvar(hashvar(name), name);
12645 setvar(name, p, flag);
12646 } while ((name = *++aptr) != NULL);
12650 showvars(argv[0], flag, 0);
12655 * Delete a function if it exists.
12658 unsetfunc(const char *name)
12660 struct tblentry *cmdp;
12662 cmdp = cmdlookup(name, 0);
12663 if (cmdp != NULL && cmdp->cmdtype == CMDFUNCTION)
12664 delete_cmd_entry();
12668 * The unset builtin command. We unset the function before we unset the
12669 * variable to allow a function to be unset when there is a readonly variable
12670 * with the same name.
12672 static int FAST_FUNC
12673 unsetcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12680 while ((i = nextopt("vf")) != 0) {
12684 for (ap = argptr; *ap; ap++) {
12697 static const unsigned char timescmd_str[] ALIGN1 = {
12698 ' ', offsetof(struct tms, tms_utime),
12699 '\n', offsetof(struct tms, tms_stime),
12700 ' ', offsetof(struct tms, tms_cutime),
12701 '\n', offsetof(struct tms, tms_cstime),
12704 static int FAST_FUNC
12705 timescmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12707 unsigned long clk_tck, s, t;
12708 const unsigned char *p;
12711 clk_tck = sysconf(_SC_CLK_TCK);
12716 t = *(clock_t *)(((char *) &buf) + p[1]);
12719 out1fmt("%lum%lu.%03lus%c",
12721 (t * 1000) / clk_tck,
12729 #if ENABLE_SH_MATH_SUPPORT
12731 * The let builtin. Partially stolen from GNU Bash, the Bourne Again SHell.
12732 * Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
12734 * Copyright (C) 2003 Vladimir Oleynik <dzo@simtreas.ru>
12736 static int FAST_FUNC
12737 letcmd(int argc UNUSED_PARAM, char **argv)
12743 ash_msg_and_raise_error("expression expected");
12745 i = ash_arith(*argv);
12753 * The read builtin. Options:
12754 * -r Do not interpret '\' specially
12755 * -s Turn off echo (tty only)
12756 * -n NCHARS Read NCHARS max
12757 * -p PROMPT Display PROMPT on stderr (if input is from tty)
12758 * -t SECONDS Timeout after SECONDS (tty or pipe only)
12759 * -u FD Read from given FD instead of fd 0
12760 * This uses unbuffered input, which may be avoidable in some cases.
12761 * TODO: bash also has:
12762 * -a ARRAY Read into array[0],[1],etc
12763 * -d DELIM End on DELIM char, not newline
12764 * -e Use line editing (tty only)
12766 static int FAST_FUNC
12767 readcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12769 char *opt_n = NULL;
12770 char *opt_p = NULL;
12771 char *opt_t = NULL;
12772 char *opt_u = NULL;
12773 int read_flags = 0;
12777 while ((i = nextopt("p:u:rt:n:s")) != '\0') {
12786 read_flags |= BUILTIN_READ_SILENT;
12792 read_flags |= BUILTIN_READ_RAW;
12802 r = shell_builtin_read(setvar2,
12804 bltinlookup("IFS"), /* can be NULL */
12812 if ((uintptr_t)r > 1)
12813 ash_msg_and_raise_error(r);
12815 return (uintptr_t)r;
12818 static int FAST_FUNC
12819 umaskcmd(int argc UNUSED_PARAM, char **argv)
12821 static const char permuser[3] ALIGN1 = "ugo";
12822 static const char permmode[3] ALIGN1 = "rwx";
12823 static const short permmask[] ALIGN2 = {
12824 S_IRUSR, S_IWUSR, S_IXUSR,
12825 S_IRGRP, S_IWGRP, S_IXGRP,
12826 S_IROTH, S_IWOTH, S_IXOTH
12829 /* TODO: use bb_parse_mode() instead */
12834 int symbolic_mode = 0;
12836 while (nextopt("S") != '\0') {
12847 if (symbolic_mode) {
12851 for (i = 0; i < 3; i++) {
12854 *p++ = permuser[i];
12856 for (j = 0; j < 3; j++) {
12857 if ((mask & permmask[3 * i + j]) == 0) {
12858 *p++ = permmode[j];
12866 out1fmt("%.4o\n", mask);
12869 if (isdigit((unsigned char) *ap)) {
12872 if (*ap >= '8' || *ap < '0')
12873 ash_msg_and_raise_error(msg_illnum, argv[1]);
12874 mask = (mask << 3) + (*ap - '0');
12875 } while (*++ap != '\0');
12878 mask = ~mask & 0777;
12879 if (!bb_parse_mode(ap, &mask)) {
12880 ash_msg_and_raise_error("illegal mode: %s", ap);
12882 umask(~mask & 0777);
12888 static int FAST_FUNC
12889 ulimitcmd(int argc UNUSED_PARAM, char **argv)
12891 return shell_builtin_ulimit(argv);
12894 /* ============ main() and helpers */
12897 * Called to exit the shell.
12906 #if ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
12907 save_history(line_input_state);
12910 status = exitstatus;
12911 TRACE(("pid %d, exitshell(%d)\n", getpid(), status));
12912 if (setjmp(loc.loc)) {
12913 if (exception_type == EXEXIT)
12914 /* dash bug: it just does _exit(exitstatus) here
12915 * but we have to do setjobctl(0) first!
12916 * (bug is still not fixed in dash-0.5.3 - if you run dash
12917 * under Midnight Commander, on exit from dash MC is backgrounded) */
12918 status = exitstatus;
12921 exception_handler = &loc;
12928 flush_stdout_stderr();
12938 /* from input.c: */
12939 /* we will never free this */
12940 basepf.next_to_pgetc = basepf.buf = ckmalloc(IBUFSIZ);
12943 signal(SIGCHLD, SIG_DFL);
12944 /* bash re-enables SIGHUP which is SIG_IGNed on entry.
12945 * Try: "trap '' HUP; bash; echo RET" and type "kill -HUP $$"
12947 signal(SIGHUP, SIG_DFL);
12953 struct stat st1, st2;
12956 for (envp = environ; envp && *envp; envp++) {
12957 if (strchr(*envp, '=')) {
12958 setvareq(*envp, VEXPORT|VTEXTFIXED);
12962 setvar("PPID", utoa(getppid()), 0);
12964 p = lookupvar("PWD");
12966 if (*p != '/' || stat(p, &st1) || stat(".", &st2)
12967 || st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino
12977 //usage:#define ash_trivial_usage
12978 //usage: "[-/+OPTIONS] [-/+o OPT]... [-c 'SCRIPT' [ARG0 [ARGS]] / FILE [ARGS]]"
12979 //usage:#define ash_full_usage "\n\n"
12980 //usage: "Unix shell interpreter"
12982 //usage:#if ENABLE_FEATURE_SH_IS_ASH
12983 //usage:# define sh_trivial_usage ash_trivial_usage
12984 //usage:# define sh_full_usage ash_full_usage
12986 //usage:#if ENABLE_FEATURE_BASH_IS_ASH
12987 //usage:# define bash_trivial_usage ash_trivial_usage
12988 //usage:# define bash_full_usage ash_full_usage
12992 * Process the shell command line arguments.
12995 procargs(char **argv)
12998 const char *xminusc;
13003 /* if (xargv[0]) - mmm, this is always true! */
13005 for (i = 0; i < NOPTS; i++)
13008 if (options(/*cmdline:*/ 1)) {
13009 /* it already printed err message */
13010 raise_exception(EXERROR);
13014 if (*xargv == NULL) {
13016 ash_msg_and_raise_error(bb_msg_requires_arg, "-c");
13019 if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
13023 for (i = 0; i < NOPTS; i++)
13024 if (optlist[i] == 2)
13029 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
13034 } else if (!sflag) {
13035 setinputfile(*xargv, 0);
13038 commandname = arg0;
13041 shellparam.p = xargv;
13042 #if ENABLE_ASH_GETOPTS
13043 shellparam.optind = 1;
13044 shellparam.optoff = -1;
13046 /* assert(shellparam.malloced == 0 && shellparam.nparam == 0); */
13048 shellparam.nparam++;
13055 * Read /etc/profile or .profile.
13058 read_profile(const char *name)
13062 if (setinputfile(name, INPUT_PUSH_FILE | INPUT_NOFILE_OK) < 0)
13071 * This routine is called when an error or an interrupt occurs in an
13072 * interactive shell and control is returned to the main command loop.
13080 /* from input.c: */
13081 g_parsefile->left_in_buffer = 0;
13082 g_parsefile->left_in_line = 0; /* clear input buffer */
13084 /* from parser.c: */
13087 /* from redir.c: */
13088 clearredir(/*drop:*/ 0);
13092 static short profile_buf[16384];
13093 extern int etext();
13097 * Main routine. We initialize things, parse the arguments, execute
13098 * profiles if we're a login shell, and then call cmdloop to execute
13099 * commands. The setjmp call sets up the location to jump to when an
13100 * exception occurs. When an exception occurs the variable "state"
13101 * is used to figure out how far we had gotten.
13103 int ash_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
13104 int ash_main(int argc UNUSED_PARAM, char **argv)
13106 const char *shinit;
13107 volatile smallint state;
13108 struct jmploc jmploc;
13109 struct stackmark smark;
13111 /* Initialize global data */
13115 #if ENABLE_ASH_ALIAS
13121 monitor(4, etext, profile_buf, sizeof(profile_buf), 50);
13124 #if ENABLE_FEATURE_EDITING
13125 line_input_state = new_line_input_t(FOR_SHELL | WITH_PATH_LOOKUP);
13128 if (setjmp(jmploc.loc)) {
13134 e = exception_type;
13138 if (e == EXEXIT || s == 0 || iflag == 0 || shlvl) {
13142 outcslow('\n', stderr);
13145 popstackmark(&smark);
13146 FORCE_INT_ON; /* enable interrupts */
13155 exception_handler = &jmploc;
13158 TRACE(("Shell args: "));
13159 trace_puts_args(argv);
13161 rootpid = getpid();
13164 setstackmark(&smark);
13167 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
13169 const char *hp = lookupvar("HISTFILE");
13171 hp = lookupvar("HOME");
13173 char *defhp = concat_path_file(hp, ".ash_history");
13174 setvar("HISTFILE", defhp, 0);
13180 if (argv[0] && argv[0][0] == '-')
13184 read_profile("/etc/profile");
13187 read_profile(".profile");
13193 getuid() == geteuid() && getgid() == getegid() &&
13197 shinit = lookupvar("ENV");
13198 if (shinit != NULL && *shinit != '\0') {
13199 read_profile(shinit);
13205 /* evalstring pushes parsefile stack.
13206 * Ensure we don't falsely claim that 0 (stdin)
13207 * is one of stacked source fds.
13208 * Testcase: ash -c 'exec 1>&0' must not complain. */
13209 // if (!sflag) g_parsefile->pf_fd = -1;
13210 // ^^ not necessary since now we special-case fd 0
13211 // in is_hidden_fd() to not be considered "hidden fd"
13212 evalstring(minusc, 0);
13215 if (sflag || minusc == NULL) {
13216 #if MAX_HISTORY > 0 && ENABLE_FEATURE_EDITING_SAVEHISTORY
13218 const char *hp = lookupvar("HISTFILE");
13220 line_input_state->hist_file = hp;
13221 # if ENABLE_FEATURE_SH_HISTFILESIZE
13222 hp = lookupvar("HISTFILESIZE");
13223 line_input_state->max_history = size_from_HISTFILESIZE(hp);
13227 state4: /* XXX ??? - why isn't this before the "if" statement */
13235 extern void _mcleanup(void);
13239 TRACE(("End of main reached\n"));
13246 * Copyright (c) 1989, 1991, 1993, 1994
13247 * The Regents of the University of California. All rights reserved.
13249 * This code is derived from software contributed to Berkeley by
13250 * Kenneth Almquist.
13252 * Redistribution and use in source and binary forms, with or without
13253 * modification, are permitted provided that the following conditions
13255 * 1. Redistributions of source code must retain the above copyright
13256 * notice, this list of conditions and the following disclaimer.
13257 * 2. Redistributions in binary form must reproduce the above copyright
13258 * notice, this list of conditions and the following disclaimer in the
13259 * documentation and/or other materials provided with the distribution.
13260 * 3. Neither the name of the University nor the names of its contributors
13261 * may be used to endorse or promote products derived from this software
13262 * without specific prior written permission.
13264 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
13265 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
13266 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
13267 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
13268 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
13269 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
13270 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
13271 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
13272 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
13273 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF