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[] = {
1904 * Note: VEXPORT would not work correctly here for NOFORK applets:
1905 * some environment strings may be constant.
1907 { VSTRFIXED|VTEXTFIXED , defifsvar , NULL },
1909 { VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL" , changemail },
1910 { VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH" , changemail },
1912 { VSTRFIXED|VTEXTFIXED , bb_PATH_root_path, changepath },
1913 { VSTRFIXED|VTEXTFIXED , "PS1=$ " , NULL },
1914 { VSTRFIXED|VTEXTFIXED , "PS2=> " , NULL },
1915 { VSTRFIXED|VTEXTFIXED , "PS4=+ " , NULL },
1916 #if ENABLE_ASH_GETOPTS
1917 { VSTRFIXED|VTEXTFIXED , "OPTIND=1" , getoptsreset },
1919 #if ENABLE_ASH_RANDOM_SUPPORT
1920 { VSTRFIXED|VTEXTFIXED|VUNSET|VDYNAMIC, "RANDOM", change_random },
1922 #if ENABLE_LOCALE_SUPPORT
1923 { VSTRFIXED|VTEXTFIXED|VUNSET, "LC_ALL" , change_lc_all },
1924 { VSTRFIXED|VTEXTFIXED|VUNSET, "LC_CTYPE" , change_lc_ctype },
1926 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
1927 { VSTRFIXED|VTEXTFIXED|VUNSET, "HISTFILE" , NULL },
1933 struct globals_var {
1934 struct shparam shellparam; /* $@ current positional parameters */
1935 struct redirtab *redirlist;
1937 int preverrout_fd; /* save fd2 before print debug if xflag is set. */
1938 struct var *vartab[VTABSIZE];
1939 struct var varinit[ARRAY_SIZE(varinit_data)];
1941 extern struct globals_var *const ash_ptr_to_globals_var;
1942 #define G_var (*ash_ptr_to_globals_var)
1943 #define shellparam (G_var.shellparam )
1944 //#define redirlist (G_var.redirlist )
1945 #define g_nullredirs (G_var.g_nullredirs )
1946 #define preverrout_fd (G_var.preverrout_fd)
1947 #define vartab (G_var.vartab )
1948 #define varinit (G_var.varinit )
1949 #define INIT_G_var() do { \
1951 (*(struct globals_var**)&ash_ptr_to_globals_var) = xzalloc(sizeof(G_var)); \
1953 for (i = 0; i < ARRAY_SIZE(varinit_data); i++) { \
1954 varinit[i].flags = varinit_data[i].flags; \
1955 varinit[i].var_text = varinit_data[i].var_text; \
1956 varinit[i].var_func = varinit_data[i].var_func; \
1960 #define vifs varinit[0]
1962 # define vmail (&vifs)[1]
1963 # define vmpath (&vmail)[1]
1964 # define vpath (&vmpath)[1]
1966 # define vpath (&vifs)[1]
1968 #define vps1 (&vpath)[1]
1969 #define vps2 (&vps1)[1]
1970 #define vps4 (&vps2)[1]
1971 #if ENABLE_ASH_GETOPTS
1972 # define voptind (&vps4)[1]
1973 # if ENABLE_ASH_RANDOM_SUPPORT
1974 # define vrandom (&voptind)[1]
1977 # if ENABLE_ASH_RANDOM_SUPPORT
1978 # define vrandom (&vps4)[1]
1983 * The following macros access the values of the above variables.
1984 * They have to skip over the name. They return the null string
1985 * for unset variables.
1987 #define ifsval() (vifs.var_text + 4)
1988 #define ifsset() ((vifs.flags & VUNSET) == 0)
1990 # define mailval() (vmail.var_text + 5)
1991 # define mpathval() (vmpath.var_text + 9)
1992 # define mpathset() ((vmpath.flags & VUNSET) == 0)
1994 #define pathval() (vpath.var_text + 5)
1995 #define ps1val() (vps1.var_text + 4)
1996 #define ps2val() (vps2.var_text + 4)
1997 #define ps4val() (vps4.var_text + 4)
1998 #if ENABLE_ASH_GETOPTS
1999 # define optindval() (voptind.var_text + 7)
2002 #if ENABLE_ASH_GETOPTS
2003 static void FAST_FUNC
2004 getoptsreset(const char *value)
2006 shellparam.optind = number(value);
2007 shellparam.optoff = -1;
2011 /* math.h has these, otherwise define our private copies */
2012 #if !ENABLE_SH_MATH_SUPPORT
2013 #define is_name(c) ((c) == '_' || isalpha((unsigned char)(c)))
2014 #define is_in_name(c) ((c) == '_' || isalnum((unsigned char)(c)))
2016 * Return the pointer to the first char which is not part of a legal variable name
2017 * (a letter or underscore followed by letters, underscores, and digits).
2020 endofname(const char *name)
2022 if (!is_name(*name))
2025 if (!is_in_name(*name))
2033 * Compares two strings up to the first = or '\0'. The first
2034 * string must be terminated by '='; the second may be terminated by
2035 * either '=' or '\0'.
2038 varcmp(const char *p, const char *q)
2042 while ((c = *p) == (d = *q)) {
2057 * Find the appropriate entry in the hash table from the name.
2059 static struct var **
2060 hashvar(const char *p)
2064 hashval = ((unsigned char) *p) << 4;
2065 while (*p && *p != '=')
2066 hashval += (unsigned char) *p++;
2067 return &vartab[hashval % VTABSIZE];
2071 vpcmp(const void *a, const void *b)
2073 return varcmp(*(const char **)a, *(const char **)b);
2077 * This routine initializes the builtin variables.
2087 * PS1 depends on uid
2089 #if ENABLE_FEATURE_EDITING && ENABLE_FEATURE_EDITING_FANCY_PROMPT
2090 vps1.var_text = "PS1=\\w \\$ ";
2093 vps1.var_text = "PS1=# ";
2096 end = vp + ARRAY_SIZE(varinit);
2098 vpp = hashvar(vp->var_text);
2101 } while (++vp < end);
2104 static struct var **
2105 findvar(struct var **vpp, const char *name)
2107 for (; *vpp; vpp = &(*vpp)->next) {
2108 if (varcmp((*vpp)->var_text, name) == 0) {
2116 * Find the value of a variable. Returns NULL if not set.
2118 static const char* FAST_FUNC
2119 lookupvar(const char *name)
2123 v = *findvar(hashvar(name), name);
2125 #if ENABLE_ASH_RANDOM_SUPPORT
2127 * Dynamic variables are implemented roughly the same way they are
2128 * in bash. Namely, they're "special" so long as they aren't unset.
2129 * As soon as they're unset, they're no longer dynamic, and dynamic
2130 * lookup will no longer happen at that point. -- PFM.
2132 if (v->flags & VDYNAMIC)
2135 if (!(v->flags & VUNSET))
2136 return var_end(v->var_text);
2142 * Search the environment of a builtin command.
2145 bltinlookup(const char *name)
2149 for (sp = cmdenviron; sp; sp = sp->next) {
2150 if (varcmp(sp->text, name) == 0)
2151 return var_end(sp->text);
2153 return lookupvar(name);
2157 * Same as setvar except that the variable and value are passed in
2158 * the first argument as name=value. Since the first argument will
2159 * be actually stored in the table, it should not be a string that
2161 * Called with interrupts off.
2164 setvareq(char *s, int flags)
2166 struct var *vp, **vpp;
2169 flags |= (VEXPORT & (((unsigned) (1 - aflag)) - 1));
2170 vp = *findvar(vpp, s);
2172 if ((vp->flags & (VREADONLY|VDYNAMIC)) == VREADONLY) {
2175 if (flags & VNOSAVE)
2178 ash_msg_and_raise_error("%.*s: is read only", strchrnul(n, '=') - n, n);
2184 if (vp->var_func && !(flags & VNOFUNC))
2185 vp->var_func(var_end(s));
2187 if (!(vp->flags & (VTEXTFIXED|VSTACK)))
2188 free((char*)vp->var_text);
2190 flags |= vp->flags & ~(VTEXTFIXED|VSTACK|VNOSAVE|VUNSET);
2192 /* variable s is not found */
2195 vp = ckzalloc(sizeof(*vp));
2197 /*vp->func = NULL; - ckzalloc did it */
2200 if (!(flags & (VTEXTFIXED|VSTACK|VNOSAVE)))
2207 * Set the value of a variable. The flags argument is ored with the
2208 * flags of the variable. If val is NULL, the variable is unset.
2211 setvar(const char *name, const char *val, int flags)
2219 q = endofname(name);
2220 p = strchrnul(q, '=');
2222 if (!namelen || p != q)
2223 ash_msg_and_raise_error("%.*s: bad variable name", namelen, name);
2228 vallen = strlen(val);
2232 nameeq = ckmalloc(namelen + vallen + 2);
2233 p = memcpy(nameeq, name, namelen) + namelen;
2236 p = memcpy(p, val, vallen) + vallen;
2239 setvareq(nameeq, flags | VNOSAVE);
2243 static void FAST_FUNC
2244 setvar2(const char *name, const char *val)
2246 setvar(name, val, 0);
2249 #if ENABLE_ASH_GETOPTS
2251 * Safe version of setvar, returns 1 on success 0 on failure.
2254 setvarsafe(const char *name, const char *val, int flags)
2257 volatile int saveint;
2258 struct jmploc *volatile savehandler = exception_handler;
2259 struct jmploc jmploc;
2262 if (setjmp(jmploc.loc))
2265 exception_handler = &jmploc;
2266 setvar(name, val, flags);
2269 exception_handler = savehandler;
2270 RESTORE_INT(saveint);
2276 * Unset the specified variable.
2279 unsetvar(const char *s)
2285 vpp = findvar(hashvar(s), s);
2289 int flags = vp->flags;
2292 if (flags & VREADONLY)
2294 #if ENABLE_ASH_RANDOM_SUPPORT
2295 vp->flags &= ~VDYNAMIC;
2299 if ((flags & VSTRFIXED) == 0) {
2301 if ((flags & (VTEXTFIXED|VSTACK)) == 0)
2302 free((char*)vp->var_text);
2308 vp->flags &= ~VEXPORT;
2318 * Process a linked list of variable assignments.
2321 listsetvar(struct strlist *list_set_var, int flags)
2323 struct strlist *lp = list_set_var;
2329 setvareq(lp->text, flags);
2336 * Generate a list of variables satisfying the given conditions.
2339 listvars(int on, int off, char ***end)
2350 for (vp = *vpp; vp; vp = vp->next) {
2351 if ((vp->flags & mask) == on) {
2352 if (ep == stackstrend())
2353 ep = growstackstr();
2354 *ep++ = (char*)vp->var_text;
2357 } while (++vpp < vartab + VTABSIZE);
2358 if (ep == stackstrend())
2359 ep = growstackstr();
2363 return grabstackstr(ep);
2367 /* ============ Path search helper
2369 * The variable path (passed by reference) should be set to the start
2370 * of the path before the first call; path_advance will update
2371 * this value as it proceeds. Successive calls to path_advance will return
2372 * the possible path expansions in sequence. If an option (indicated by
2373 * a percent sign) appears in the path entry then the global variable
2374 * pathopt will be set to point to it; otherwise pathopt will be set to
2377 static const char *pathopt; /* set by path_advance */
2380 path_advance(const char **path, const char *name)
2390 for (p = start; *p && *p != ':' && *p != '%'; p++)
2392 len = p - start + strlen(name) + 2; /* "2" is for '/' and '\0' */
2393 while (stackblocksize() < len)
2397 memcpy(q, start, p - start);
2405 while (*p && *p != ':')
2412 return stalloc(len);
2416 /* ============ Prompt */
2418 static smallint doprompt; /* if set, prompt the user */
2419 static smallint needprompt; /* true if interactive and at start of line */
2421 #if ENABLE_FEATURE_EDITING
2422 static line_input_t *line_input_state;
2423 static const char *cmdedit_prompt;
2425 putprompt(const char *s)
2427 if (ENABLE_ASH_EXPAND_PRMT) {
2428 free((char*)cmdedit_prompt);
2429 cmdedit_prompt = ckstrdup(s);
2436 putprompt(const char *s)
2442 #if ENABLE_ASH_EXPAND_PRMT
2443 /* expandstr() needs parsing machinery, so it is far away ahead... */
2444 static const char *expandstr(const char *ps);
2446 #define expandstr(s) s
2450 setprompt_if(smallint do_set, int whichprompt)
2453 IF_ASH_EXPAND_PRMT(struct stackmark smark;)
2460 switch (whichprompt) {
2470 #if ENABLE_ASH_EXPAND_PRMT
2471 setstackmark(&smark);
2472 stalloc(stackblocksize());
2474 putprompt(expandstr(prompt));
2475 #if ENABLE_ASH_EXPAND_PRMT
2476 popstackmark(&smark);
2481 /* ============ The cd and pwd commands */
2483 #define CD_PHYSICAL 1
2493 while ((i = nextopt("LP")) != '\0') {
2495 flags ^= CD_PHYSICAL;
2504 * Update curdir (the name of the current directory) in response to a
2508 updatepwd(const char *dir)
2515 cdcomppath = ststrdup(dir);
2518 if (curdir == nullstr)
2520 new = stack_putstr(curdir, new);
2522 new = makestrspace(strlen(dir) + 2, new);
2523 lim = (char *)stackblock() + 1;
2527 if (new > lim && *lim == '/')
2532 if (dir[1] == '/' && dir[2] != '/') {
2538 p = strtok(cdcomppath, "/");
2542 if (p[1] == '.' && p[2] == '\0') {
2554 new = stack_putstr(p, new);
2562 return stackblock();
2566 * Find out what the current directory is. If we already know the current
2567 * directory, this routine returns immediately.
2572 char *dir = getcwd(NULL, 0); /* huh, using glibc extension? */
2573 return dir ? dir : nullstr;
2577 setpwd(const char *val, int setold)
2581 oldcur = dir = curdir;
2584 setvar("OLDPWD", oldcur, VEXPORT);
2587 if (physdir != nullstr) {
2588 if (physdir != oldcur)
2592 if (oldcur == val || !val) {
2598 dir = ckstrdup(val);
2599 if (oldcur != dir && oldcur != nullstr) {
2604 setvar("PWD", dir, VEXPORT);
2607 static void hashcd(void);
2610 * Actually do the chdir. We also call hashcd to let the routines in exec.c
2611 * know that the current directory has changed.
2614 docd(const char *dest, int flags)
2616 const char *dir = NULL;
2619 TRACE(("docd(\"%s\", %d) called\n", dest, flags));
2622 if (!(flags & CD_PHYSICAL)) {
2623 dir = updatepwd(dest);
2637 static int FAST_FUNC
2638 cdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
2650 dest = bltinlookup("HOME");
2651 else if (LONE_DASH(dest)) {
2652 dest = bltinlookup("OLDPWD");
2674 path = bltinlookup("CDPATH");
2683 p = path_advance(&path, dest);
2684 if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
2688 if (!docd(p, flags))
2693 ash_msg_and_raise_error("can't cd to %s", dest);
2696 if (flags & CD_PRINT)
2697 out1fmt("%s\n", curdir);
2701 static int FAST_FUNC
2702 pwdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
2705 const char *dir = curdir;
2709 if (physdir == nullstr)
2713 out1fmt("%s\n", dir);
2718 /* ============ ... */
2721 #define IBUFSIZ (ENABLE_FEATURE_EDITING ? CONFIG_FEATURE_EDITING_MAX_LEN : 1024)
2723 /* Syntax classes */
2724 #define CWORD 0 /* character is nothing special */
2725 #define CNL 1 /* newline character */
2726 #define CBACK 2 /* a backslash character */
2727 #define CSQUOTE 3 /* single quote */
2728 #define CDQUOTE 4 /* double quote */
2729 #define CENDQUOTE 5 /* a terminating quote */
2730 #define CBQUOTE 6 /* backwards single quote */
2731 #define CVAR 7 /* a dollar sign */
2732 #define CENDVAR 8 /* a '}' character */
2733 #define CLP 9 /* a left paren in arithmetic */
2734 #define CRP 10 /* a right paren in arithmetic */
2735 #define CENDFILE 11 /* end of file */
2736 #define CCTL 12 /* like CWORD, except it must be escaped */
2737 #define CSPCL 13 /* these terminate a word */
2738 #define CIGN 14 /* character should be ignored */
2741 #if ENABLE_ASH_ALIAS
2745 #define USE_SIT_FUNCTION ENABLE_ASH_OPTIMIZE_FOR_SIZE
2747 #if ENABLE_SH_MATH_SUPPORT
2748 # define SIT_ITEM(a,b,c,d) (a | (b << 4) | (c << 8) | (d << 12))
2750 # define SIT_ITEM(a,b,c,d) (a | (b << 4) | (c << 8))
2752 static const uint16_t S_I_T[] = {
2753 #if ENABLE_ASH_ALIAS
2754 SIT_ITEM(CSPCL , CIGN , CIGN , CIGN ), /* 0, PEOA */
2756 SIT_ITEM(CSPCL , CWORD , CWORD, CWORD ), /* 1, ' ' */
2757 SIT_ITEM(CNL , CNL , CNL , CNL ), /* 2, \n */
2758 SIT_ITEM(CWORD , CCTL , CCTL , CWORD ), /* 3, !*-/:=?[]~ */
2759 SIT_ITEM(CDQUOTE , CENDQUOTE, CWORD, CWORD ), /* 4, '"' */
2760 SIT_ITEM(CVAR , CVAR , CWORD, CVAR ), /* 5, $ */
2761 SIT_ITEM(CSQUOTE , CWORD , CENDQUOTE, CWORD), /* 6, "'" */
2762 SIT_ITEM(CSPCL , CWORD , CWORD, CLP ), /* 7, ( */
2763 SIT_ITEM(CSPCL , CWORD , CWORD, CRP ), /* 8, ) */
2764 SIT_ITEM(CBACK , CBACK , CCTL , CBACK ), /* 9, \ */
2765 SIT_ITEM(CBQUOTE , CBQUOTE , CWORD, CBQUOTE), /* 10, ` */
2766 SIT_ITEM(CENDVAR , CENDVAR , CWORD, CENDVAR), /* 11, } */
2767 #if !USE_SIT_FUNCTION
2768 SIT_ITEM(CENDFILE, CENDFILE , CENDFILE, CENDFILE),/* 12, PEOF */
2769 SIT_ITEM(CWORD , CWORD , CWORD, CWORD ), /* 13, 0-9A-Za-z */
2770 SIT_ITEM(CCTL , CCTL , CCTL , CCTL ) /* 14, CTLESC ... */
2774 /* Constants below must match table above */
2776 #if ENABLE_ASH_ALIAS
2777 CSPCL_CIGN_CIGN_CIGN , /* 0 */
2779 CSPCL_CWORD_CWORD_CWORD , /* 1 */
2780 CNL_CNL_CNL_CNL , /* 2 */
2781 CWORD_CCTL_CCTL_CWORD , /* 3 */
2782 CDQUOTE_CENDQUOTE_CWORD_CWORD , /* 4 */
2783 CVAR_CVAR_CWORD_CVAR , /* 5 */
2784 CSQUOTE_CWORD_CENDQUOTE_CWORD , /* 6 */
2785 CSPCL_CWORD_CWORD_CLP , /* 7 */
2786 CSPCL_CWORD_CWORD_CRP , /* 8 */
2787 CBACK_CBACK_CCTL_CBACK , /* 9 */
2788 CBQUOTE_CBQUOTE_CWORD_CBQUOTE , /* 10 */
2789 CENDVAR_CENDVAR_CWORD_CENDVAR , /* 11 */
2790 CENDFILE_CENDFILE_CENDFILE_CENDFILE, /* 12 */
2791 CWORD_CWORD_CWORD_CWORD , /* 13 */
2792 CCTL_CCTL_CCTL_CCTL , /* 14 */
2795 /* c in SIT(c, syntax) must be an *unsigned char* or PEOA or PEOF,
2796 * caller must ensure proper cast on it if c is *char_ptr!
2798 /* Values for syntax param */
2799 #define BASESYNTAX 0 /* not in quotes */
2800 #define DQSYNTAX 1 /* in double quotes */
2801 #define SQSYNTAX 2 /* in single quotes */
2802 #define ARISYNTAX 3 /* in arithmetic */
2803 #define PSSYNTAX 4 /* prompt. never passed to SIT() */
2805 #if USE_SIT_FUNCTION
2808 SIT(int c, int syntax)
2810 static const char spec_symbls[] ALIGN1 = "\t\n !\"$&'()*-/:;<=>?[\\]`|}~";
2811 # if ENABLE_ASH_ALIAS
2812 static const uint8_t syntax_index_table[] ALIGN1 = {
2813 1, 2, 1, 3, 4, 5, 1, 6, /* "\t\n !\"$&'" */
2814 7, 8, 3, 3, 3, 3, 1, 1, /* "()*-/:;<" */
2815 3, 1, 3, 3, 9, 3, 10, 1, /* "=>?[\\]`|" */
2819 static const uint8_t syntax_index_table[] ALIGN1 = {
2820 0, 1, 0, 2, 3, 4, 0, 5, /* "\t\n !\"$&'" */
2821 6, 7, 2, 2, 2, 2, 0, 0, /* "()*-/:;<" */
2822 2, 0, 2, 2, 8, 2, 9, 0, /* "=>?[\\]`|" */
2831 # if ENABLE_ASH_ALIAS
2837 /* Cast is purely for paranoia here,
2838 * just in case someone passed signed char to us */
2839 if ((unsigned char)c >= CTL_FIRST
2840 && (unsigned char)c <= CTL_LAST
2844 s = strchrnul(spec_symbls, c);
2847 indx = syntax_index_table[s - spec_symbls];
2849 return (S_I_T[indx] >> (syntax*4)) & 0xf;
2852 #else /* !USE_SIT_FUNCTION */
2854 static const uint8_t syntax_index_table[] = {
2855 /* BASESYNTAX_DQSYNTAX_SQSYNTAX_ARISYNTAX */
2856 /* 0 */ CWORD_CWORD_CWORD_CWORD,
2857 /* 1 */ CWORD_CWORD_CWORD_CWORD,
2858 /* 2 */ CWORD_CWORD_CWORD_CWORD,
2859 /* 3 */ CWORD_CWORD_CWORD_CWORD,
2860 /* 4 */ CWORD_CWORD_CWORD_CWORD,
2861 /* 5 */ CWORD_CWORD_CWORD_CWORD,
2862 /* 6 */ CWORD_CWORD_CWORD_CWORD,
2863 /* 7 */ CWORD_CWORD_CWORD_CWORD,
2864 /* 8 */ CWORD_CWORD_CWORD_CWORD,
2865 /* 9 "\t" */ CSPCL_CWORD_CWORD_CWORD,
2866 /* 10 "\n" */ CNL_CNL_CNL_CNL,
2867 /* 11 */ CWORD_CWORD_CWORD_CWORD,
2868 /* 12 */ CWORD_CWORD_CWORD_CWORD,
2869 /* 13 */ CWORD_CWORD_CWORD_CWORD,
2870 /* 14 */ CWORD_CWORD_CWORD_CWORD,
2871 /* 15 */ CWORD_CWORD_CWORD_CWORD,
2872 /* 16 */ CWORD_CWORD_CWORD_CWORD,
2873 /* 17 */ CWORD_CWORD_CWORD_CWORD,
2874 /* 18 */ CWORD_CWORD_CWORD_CWORD,
2875 /* 19 */ CWORD_CWORD_CWORD_CWORD,
2876 /* 20 */ CWORD_CWORD_CWORD_CWORD,
2877 /* 21 */ CWORD_CWORD_CWORD_CWORD,
2878 /* 22 */ CWORD_CWORD_CWORD_CWORD,
2879 /* 23 */ CWORD_CWORD_CWORD_CWORD,
2880 /* 24 */ CWORD_CWORD_CWORD_CWORD,
2881 /* 25 */ CWORD_CWORD_CWORD_CWORD,
2882 /* 26 */ CWORD_CWORD_CWORD_CWORD,
2883 /* 27 */ CWORD_CWORD_CWORD_CWORD,
2884 /* 28 */ CWORD_CWORD_CWORD_CWORD,
2885 /* 29 */ CWORD_CWORD_CWORD_CWORD,
2886 /* 30 */ CWORD_CWORD_CWORD_CWORD,
2887 /* 31 */ CWORD_CWORD_CWORD_CWORD,
2888 /* 32 " " */ CSPCL_CWORD_CWORD_CWORD,
2889 /* 33 "!" */ CWORD_CCTL_CCTL_CWORD,
2890 /* 34 """ */ CDQUOTE_CENDQUOTE_CWORD_CWORD,
2891 /* 35 "#" */ CWORD_CWORD_CWORD_CWORD,
2892 /* 36 "$" */ CVAR_CVAR_CWORD_CVAR,
2893 /* 37 "%" */ CWORD_CWORD_CWORD_CWORD,
2894 /* 38 "&" */ CSPCL_CWORD_CWORD_CWORD,
2895 /* 39 "'" */ CSQUOTE_CWORD_CENDQUOTE_CWORD,
2896 /* 40 "(" */ CSPCL_CWORD_CWORD_CLP,
2897 /* 41 ")" */ CSPCL_CWORD_CWORD_CRP,
2898 /* 42 "*" */ CWORD_CCTL_CCTL_CWORD,
2899 /* 43 "+" */ CWORD_CWORD_CWORD_CWORD,
2900 /* 44 "," */ CWORD_CWORD_CWORD_CWORD,
2901 /* 45 "-" */ CWORD_CCTL_CCTL_CWORD,
2902 /* 46 "." */ CWORD_CWORD_CWORD_CWORD,
2903 /* 47 "/" */ CWORD_CCTL_CCTL_CWORD,
2904 /* 48 "0" */ CWORD_CWORD_CWORD_CWORD,
2905 /* 49 "1" */ CWORD_CWORD_CWORD_CWORD,
2906 /* 50 "2" */ CWORD_CWORD_CWORD_CWORD,
2907 /* 51 "3" */ CWORD_CWORD_CWORD_CWORD,
2908 /* 52 "4" */ CWORD_CWORD_CWORD_CWORD,
2909 /* 53 "5" */ CWORD_CWORD_CWORD_CWORD,
2910 /* 54 "6" */ CWORD_CWORD_CWORD_CWORD,
2911 /* 55 "7" */ CWORD_CWORD_CWORD_CWORD,
2912 /* 56 "8" */ CWORD_CWORD_CWORD_CWORD,
2913 /* 57 "9" */ CWORD_CWORD_CWORD_CWORD,
2914 /* 58 ":" */ CWORD_CCTL_CCTL_CWORD,
2915 /* 59 ";" */ CSPCL_CWORD_CWORD_CWORD,
2916 /* 60 "<" */ CSPCL_CWORD_CWORD_CWORD,
2917 /* 61 "=" */ CWORD_CCTL_CCTL_CWORD,
2918 /* 62 ">" */ CSPCL_CWORD_CWORD_CWORD,
2919 /* 63 "?" */ CWORD_CCTL_CCTL_CWORD,
2920 /* 64 "@" */ CWORD_CWORD_CWORD_CWORD,
2921 /* 65 "A" */ CWORD_CWORD_CWORD_CWORD,
2922 /* 66 "B" */ CWORD_CWORD_CWORD_CWORD,
2923 /* 67 "C" */ CWORD_CWORD_CWORD_CWORD,
2924 /* 68 "D" */ CWORD_CWORD_CWORD_CWORD,
2925 /* 69 "E" */ CWORD_CWORD_CWORD_CWORD,
2926 /* 70 "F" */ CWORD_CWORD_CWORD_CWORD,
2927 /* 71 "G" */ CWORD_CWORD_CWORD_CWORD,
2928 /* 72 "H" */ CWORD_CWORD_CWORD_CWORD,
2929 /* 73 "I" */ CWORD_CWORD_CWORD_CWORD,
2930 /* 74 "J" */ CWORD_CWORD_CWORD_CWORD,
2931 /* 75 "K" */ CWORD_CWORD_CWORD_CWORD,
2932 /* 76 "L" */ CWORD_CWORD_CWORD_CWORD,
2933 /* 77 "M" */ CWORD_CWORD_CWORD_CWORD,
2934 /* 78 "N" */ CWORD_CWORD_CWORD_CWORD,
2935 /* 79 "O" */ CWORD_CWORD_CWORD_CWORD,
2936 /* 80 "P" */ CWORD_CWORD_CWORD_CWORD,
2937 /* 81 "Q" */ CWORD_CWORD_CWORD_CWORD,
2938 /* 82 "R" */ CWORD_CWORD_CWORD_CWORD,
2939 /* 83 "S" */ CWORD_CWORD_CWORD_CWORD,
2940 /* 84 "T" */ CWORD_CWORD_CWORD_CWORD,
2941 /* 85 "U" */ CWORD_CWORD_CWORD_CWORD,
2942 /* 86 "V" */ CWORD_CWORD_CWORD_CWORD,
2943 /* 87 "W" */ CWORD_CWORD_CWORD_CWORD,
2944 /* 88 "X" */ CWORD_CWORD_CWORD_CWORD,
2945 /* 89 "Y" */ CWORD_CWORD_CWORD_CWORD,
2946 /* 90 "Z" */ CWORD_CWORD_CWORD_CWORD,
2947 /* 91 "[" */ CWORD_CCTL_CCTL_CWORD,
2948 /* 92 "\" */ CBACK_CBACK_CCTL_CBACK,
2949 /* 93 "]" */ CWORD_CCTL_CCTL_CWORD,
2950 /* 94 "^" */ CWORD_CWORD_CWORD_CWORD,
2951 /* 95 "_" */ CWORD_CWORD_CWORD_CWORD,
2952 /* 96 "`" */ CBQUOTE_CBQUOTE_CWORD_CBQUOTE,
2953 /* 97 "a" */ CWORD_CWORD_CWORD_CWORD,
2954 /* 98 "b" */ CWORD_CWORD_CWORD_CWORD,
2955 /* 99 "c" */ CWORD_CWORD_CWORD_CWORD,
2956 /* 100 "d" */ CWORD_CWORD_CWORD_CWORD,
2957 /* 101 "e" */ CWORD_CWORD_CWORD_CWORD,
2958 /* 102 "f" */ CWORD_CWORD_CWORD_CWORD,
2959 /* 103 "g" */ CWORD_CWORD_CWORD_CWORD,
2960 /* 104 "h" */ CWORD_CWORD_CWORD_CWORD,
2961 /* 105 "i" */ CWORD_CWORD_CWORD_CWORD,
2962 /* 106 "j" */ CWORD_CWORD_CWORD_CWORD,
2963 /* 107 "k" */ CWORD_CWORD_CWORD_CWORD,
2964 /* 108 "l" */ CWORD_CWORD_CWORD_CWORD,
2965 /* 109 "m" */ CWORD_CWORD_CWORD_CWORD,
2966 /* 110 "n" */ CWORD_CWORD_CWORD_CWORD,
2967 /* 111 "o" */ CWORD_CWORD_CWORD_CWORD,
2968 /* 112 "p" */ CWORD_CWORD_CWORD_CWORD,
2969 /* 113 "q" */ CWORD_CWORD_CWORD_CWORD,
2970 /* 114 "r" */ CWORD_CWORD_CWORD_CWORD,
2971 /* 115 "s" */ CWORD_CWORD_CWORD_CWORD,
2972 /* 116 "t" */ CWORD_CWORD_CWORD_CWORD,
2973 /* 117 "u" */ CWORD_CWORD_CWORD_CWORD,
2974 /* 118 "v" */ CWORD_CWORD_CWORD_CWORD,
2975 /* 119 "w" */ CWORD_CWORD_CWORD_CWORD,
2976 /* 120 "x" */ CWORD_CWORD_CWORD_CWORD,
2977 /* 121 "y" */ CWORD_CWORD_CWORD_CWORD,
2978 /* 122 "z" */ CWORD_CWORD_CWORD_CWORD,
2979 /* 123 "{" */ CWORD_CWORD_CWORD_CWORD,
2980 /* 124 "|" */ CSPCL_CWORD_CWORD_CWORD,
2981 /* 125 "}" */ CENDVAR_CENDVAR_CWORD_CENDVAR,
2982 /* 126 "~" */ CWORD_CCTL_CCTL_CWORD,
2983 /* 127 del */ CWORD_CWORD_CWORD_CWORD,
2984 /* 128 0x80 */ CWORD_CWORD_CWORD_CWORD,
2985 /* 129 CTLESC */ CCTL_CCTL_CCTL_CCTL,
2986 /* 130 CTLVAR */ CCTL_CCTL_CCTL_CCTL,
2987 /* 131 CTLENDVAR */ CCTL_CCTL_CCTL_CCTL,
2988 /* 132 CTLBACKQ */ CCTL_CCTL_CCTL_CCTL,
2989 /* 133 CTLQUOTE */ CCTL_CCTL_CCTL_CCTL,
2990 /* 134 CTLARI */ CCTL_CCTL_CCTL_CCTL,
2991 /* 135 CTLENDARI */ CCTL_CCTL_CCTL_CCTL,
2992 /* 136 CTLQUOTEMARK */ CCTL_CCTL_CCTL_CCTL,
2993 /* 137 */ CWORD_CWORD_CWORD_CWORD,
2994 /* 138 */ CWORD_CWORD_CWORD_CWORD,
2995 /* 139 */ CWORD_CWORD_CWORD_CWORD,
2996 /* 140 */ CWORD_CWORD_CWORD_CWORD,
2997 /* 141 */ CWORD_CWORD_CWORD_CWORD,
2998 /* 142 */ CWORD_CWORD_CWORD_CWORD,
2999 /* 143 */ CWORD_CWORD_CWORD_CWORD,
3000 /* 144 */ CWORD_CWORD_CWORD_CWORD,
3001 /* 145 */ CWORD_CWORD_CWORD_CWORD,
3002 /* 146 */ CWORD_CWORD_CWORD_CWORD,
3003 /* 147 */ CWORD_CWORD_CWORD_CWORD,
3004 /* 148 */ CWORD_CWORD_CWORD_CWORD,
3005 /* 149 */ CWORD_CWORD_CWORD_CWORD,
3006 /* 150 */ CWORD_CWORD_CWORD_CWORD,
3007 /* 151 */ CWORD_CWORD_CWORD_CWORD,
3008 /* 152 */ CWORD_CWORD_CWORD_CWORD,
3009 /* 153 */ CWORD_CWORD_CWORD_CWORD,
3010 /* 154 */ CWORD_CWORD_CWORD_CWORD,
3011 /* 155 */ CWORD_CWORD_CWORD_CWORD,
3012 /* 156 */ CWORD_CWORD_CWORD_CWORD,
3013 /* 157 */ CWORD_CWORD_CWORD_CWORD,
3014 /* 158 */ CWORD_CWORD_CWORD_CWORD,
3015 /* 159 */ CWORD_CWORD_CWORD_CWORD,
3016 /* 160 */ CWORD_CWORD_CWORD_CWORD,
3017 /* 161 */ CWORD_CWORD_CWORD_CWORD,
3018 /* 162 */ CWORD_CWORD_CWORD_CWORD,
3019 /* 163 */ CWORD_CWORD_CWORD_CWORD,
3020 /* 164 */ CWORD_CWORD_CWORD_CWORD,
3021 /* 165 */ CWORD_CWORD_CWORD_CWORD,
3022 /* 166 */ CWORD_CWORD_CWORD_CWORD,
3023 /* 167 */ CWORD_CWORD_CWORD_CWORD,
3024 /* 168 */ CWORD_CWORD_CWORD_CWORD,
3025 /* 169 */ CWORD_CWORD_CWORD_CWORD,
3026 /* 170 */ CWORD_CWORD_CWORD_CWORD,
3027 /* 171 */ CWORD_CWORD_CWORD_CWORD,
3028 /* 172 */ CWORD_CWORD_CWORD_CWORD,
3029 /* 173 */ CWORD_CWORD_CWORD_CWORD,
3030 /* 174 */ CWORD_CWORD_CWORD_CWORD,
3031 /* 175 */ CWORD_CWORD_CWORD_CWORD,
3032 /* 176 */ CWORD_CWORD_CWORD_CWORD,
3033 /* 177 */ CWORD_CWORD_CWORD_CWORD,
3034 /* 178 */ CWORD_CWORD_CWORD_CWORD,
3035 /* 179 */ CWORD_CWORD_CWORD_CWORD,
3036 /* 180 */ CWORD_CWORD_CWORD_CWORD,
3037 /* 181 */ CWORD_CWORD_CWORD_CWORD,
3038 /* 182 */ CWORD_CWORD_CWORD_CWORD,
3039 /* 183 */ CWORD_CWORD_CWORD_CWORD,
3040 /* 184 */ CWORD_CWORD_CWORD_CWORD,
3041 /* 185 */ CWORD_CWORD_CWORD_CWORD,
3042 /* 186 */ CWORD_CWORD_CWORD_CWORD,
3043 /* 187 */ CWORD_CWORD_CWORD_CWORD,
3044 /* 188 */ CWORD_CWORD_CWORD_CWORD,
3045 /* 189 */ CWORD_CWORD_CWORD_CWORD,
3046 /* 190 */ CWORD_CWORD_CWORD_CWORD,
3047 /* 191 */ CWORD_CWORD_CWORD_CWORD,
3048 /* 192 */ CWORD_CWORD_CWORD_CWORD,
3049 /* 193 */ CWORD_CWORD_CWORD_CWORD,
3050 /* 194 */ CWORD_CWORD_CWORD_CWORD,
3051 /* 195 */ CWORD_CWORD_CWORD_CWORD,
3052 /* 196 */ CWORD_CWORD_CWORD_CWORD,
3053 /* 197 */ CWORD_CWORD_CWORD_CWORD,
3054 /* 198 */ CWORD_CWORD_CWORD_CWORD,
3055 /* 199 */ CWORD_CWORD_CWORD_CWORD,
3056 /* 200 */ CWORD_CWORD_CWORD_CWORD,
3057 /* 201 */ CWORD_CWORD_CWORD_CWORD,
3058 /* 202 */ CWORD_CWORD_CWORD_CWORD,
3059 /* 203 */ CWORD_CWORD_CWORD_CWORD,
3060 /* 204 */ CWORD_CWORD_CWORD_CWORD,
3061 /* 205 */ CWORD_CWORD_CWORD_CWORD,
3062 /* 206 */ CWORD_CWORD_CWORD_CWORD,
3063 /* 207 */ CWORD_CWORD_CWORD_CWORD,
3064 /* 208 */ CWORD_CWORD_CWORD_CWORD,
3065 /* 209 */ CWORD_CWORD_CWORD_CWORD,
3066 /* 210 */ CWORD_CWORD_CWORD_CWORD,
3067 /* 211 */ CWORD_CWORD_CWORD_CWORD,
3068 /* 212 */ CWORD_CWORD_CWORD_CWORD,
3069 /* 213 */ CWORD_CWORD_CWORD_CWORD,
3070 /* 214 */ CWORD_CWORD_CWORD_CWORD,
3071 /* 215 */ CWORD_CWORD_CWORD_CWORD,
3072 /* 216 */ CWORD_CWORD_CWORD_CWORD,
3073 /* 217 */ CWORD_CWORD_CWORD_CWORD,
3074 /* 218 */ CWORD_CWORD_CWORD_CWORD,
3075 /* 219 */ CWORD_CWORD_CWORD_CWORD,
3076 /* 220 */ CWORD_CWORD_CWORD_CWORD,
3077 /* 221 */ CWORD_CWORD_CWORD_CWORD,
3078 /* 222 */ CWORD_CWORD_CWORD_CWORD,
3079 /* 223 */ CWORD_CWORD_CWORD_CWORD,
3080 /* 224 */ CWORD_CWORD_CWORD_CWORD,
3081 /* 225 */ CWORD_CWORD_CWORD_CWORD,
3082 /* 226 */ CWORD_CWORD_CWORD_CWORD,
3083 /* 227 */ CWORD_CWORD_CWORD_CWORD,
3084 /* 228 */ CWORD_CWORD_CWORD_CWORD,
3085 /* 229 */ CWORD_CWORD_CWORD_CWORD,
3086 /* 230 */ CWORD_CWORD_CWORD_CWORD,
3087 /* 231 */ CWORD_CWORD_CWORD_CWORD,
3088 /* 232 */ CWORD_CWORD_CWORD_CWORD,
3089 /* 233 */ CWORD_CWORD_CWORD_CWORD,
3090 /* 234 */ CWORD_CWORD_CWORD_CWORD,
3091 /* 235 */ CWORD_CWORD_CWORD_CWORD,
3092 /* 236 */ CWORD_CWORD_CWORD_CWORD,
3093 /* 237 */ CWORD_CWORD_CWORD_CWORD,
3094 /* 238 */ CWORD_CWORD_CWORD_CWORD,
3095 /* 239 */ CWORD_CWORD_CWORD_CWORD,
3096 /* 230 */ CWORD_CWORD_CWORD_CWORD,
3097 /* 241 */ CWORD_CWORD_CWORD_CWORD,
3098 /* 242 */ CWORD_CWORD_CWORD_CWORD,
3099 /* 243 */ CWORD_CWORD_CWORD_CWORD,
3100 /* 244 */ CWORD_CWORD_CWORD_CWORD,
3101 /* 245 */ CWORD_CWORD_CWORD_CWORD,
3102 /* 246 */ CWORD_CWORD_CWORD_CWORD,
3103 /* 247 */ CWORD_CWORD_CWORD_CWORD,
3104 /* 248 */ CWORD_CWORD_CWORD_CWORD,
3105 /* 249 */ CWORD_CWORD_CWORD_CWORD,
3106 /* 250 */ CWORD_CWORD_CWORD_CWORD,
3107 /* 251 */ CWORD_CWORD_CWORD_CWORD,
3108 /* 252 */ CWORD_CWORD_CWORD_CWORD,
3109 /* 253 */ CWORD_CWORD_CWORD_CWORD,
3110 /* 254 */ CWORD_CWORD_CWORD_CWORD,
3111 /* 255 */ CWORD_CWORD_CWORD_CWORD,
3112 /* PEOF */ CENDFILE_CENDFILE_CENDFILE_CENDFILE,
3113 # if ENABLE_ASH_ALIAS
3114 /* PEOA */ CSPCL_CIGN_CIGN_CIGN,
3118 # define SIT(c, syntax) ((S_I_T[syntax_index_table[c]] >> ((syntax)*4)) & 0xf)
3120 #endif /* !USE_SIT_FUNCTION */
3123 /* ============ Alias handling */
3125 #if ENABLE_ASH_ALIAS
3127 #define ALIASINUSE 1
3138 static struct alias **atab; // [ATABSIZE];
3139 #define INIT_G_alias() do { \
3140 atab = xzalloc(ATABSIZE * sizeof(atab[0])); \
3144 static struct alias **
3145 __lookupalias(const char *name) {
3146 unsigned int hashval;
3153 ch = (unsigned char)*p;
3157 ch = (unsigned char)*++p;
3159 app = &atab[hashval % ATABSIZE];
3161 for (; *app; app = &(*app)->next) {
3162 if (strcmp(name, (*app)->name) == 0) {
3170 static struct alias *
3171 lookupalias(const char *name, int check)
3173 struct alias *ap = *__lookupalias(name);
3175 if (check && ap && (ap->flag & ALIASINUSE))
3180 static struct alias *
3181 freealias(struct alias *ap)
3185 if (ap->flag & ALIASINUSE) {
3186 ap->flag |= ALIASDEAD;
3198 setalias(const char *name, const char *val)
3200 struct alias *ap, **app;
3202 app = __lookupalias(name);
3206 if (!(ap->flag & ALIASINUSE)) {
3209 ap->val = ckstrdup(val);
3210 ap->flag &= ~ALIASDEAD;
3213 ap = ckzalloc(sizeof(struct alias));
3214 ap->name = ckstrdup(name);
3215 ap->val = ckstrdup(val);
3216 /*ap->flag = 0; - ckzalloc did it */
3217 /*ap->next = NULL;*/
3224 unalias(const char *name)
3228 app = __lookupalias(name);
3232 *app = freealias(*app);
3243 struct alias *ap, **app;
3247 for (i = 0; i < ATABSIZE; i++) {
3249 for (ap = *app; ap; ap = *app) {
3250 *app = freealias(*app);
3260 printalias(const struct alias *ap)
3262 out1fmt("%s=%s\n", ap->name, single_quote(ap->val));
3266 * TODO - sort output
3268 static int FAST_FUNC
3269 aliascmd(int argc UNUSED_PARAM, char **argv)
3278 for (i = 0; i < ATABSIZE; i++) {
3279 for (ap = atab[i]; ap; ap = ap->next) {
3285 while ((n = *++argv) != NULL) {
3286 v = strchr(n+1, '=');
3287 if (v == NULL) { /* n+1: funny ksh stuff */
3288 ap = *__lookupalias(n);
3290 fprintf(stderr, "%s: %s not found\n", "alias", n);
3303 static int FAST_FUNC
3304 unaliascmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
3308 while ((i = nextopt("a")) != '\0') {
3314 for (i = 0; *argptr; argptr++) {
3315 if (unalias(*argptr)) {
3316 fprintf(stderr, "%s: %s not found\n", "unalias", *argptr);
3324 #endif /* ASH_ALIAS */
3327 /* ============ jobs.c */
3329 /* Mode argument to forkshell. Don't change FORK_FG or FORK_BG. */
3332 #define FORK_NOJOB 2
3334 /* mode flags for showjob(s) */
3335 #define SHOW_ONLY_PGID 0x01 /* show only pgid (jobs -p) */
3336 #define SHOW_PIDS 0x02 /* show individual pids, not just one line per job */
3337 #define SHOW_CHANGED 0x04 /* only jobs whose state has changed */
3340 * A job structure contains information about a job. A job is either a
3341 * single process or a set of processes contained in a pipeline. In the
3342 * latter case, pidlist will be non-NULL, and will point to a -1 terminated
3346 pid_t ps_pid; /* process id */
3347 int ps_status; /* last process status from wait() */
3348 char *ps_cmd; /* text of command being run */
3352 struct procstat ps0; /* status of process */
3353 struct procstat *ps; /* status or processes when more than one */
3355 int stopstatus; /* status of a stopped job */
3358 nprocs: 16, /* number of processes */
3360 #define JOBRUNNING 0 /* at least one proc running */
3361 #define JOBSTOPPED 1 /* all procs are stopped */
3362 #define JOBDONE 2 /* all procs are completed */
3364 sigint: 1, /* job was killed by SIGINT */
3365 jobctl: 1, /* job running under job control */
3367 waited: 1, /* true if this entry has been waited for */
3368 used: 1, /* true if this entry is in used */
3369 changed: 1; /* true if status has changed */
3370 struct job *prev_job; /* previous job */
3373 static struct job *makejob(/*union node *,*/ int);
3374 static int forkshell(struct job *, union node *, int);
3375 static int waitforjob(struct job *);
3378 enum { doing_jobctl = 0 };
3379 #define setjobctl(on) do {} while (0)
3381 static smallint doing_jobctl; //references:8
3382 static void setjobctl(int);
3389 ignoresig(int signo)
3391 /* Avoid unnecessary system calls. Is it already SIG_IGNed? */
3392 if (sigmode[signo - 1] != S_IGN && sigmode[signo - 1] != S_HARD_IGN) {
3393 /* No, need to do it */
3394 signal(signo, SIG_IGN);
3396 sigmode[signo - 1] = S_HARD_IGN;
3400 * Only one usage site - in setsignal()
3403 signal_handler(int signo)
3405 gotsig[signo - 1] = 1;
3407 if (signo == SIGINT && !trap[SIGINT]) {
3408 if (!suppress_int) {
3410 raise_interrupt(); /* does not return */
3414 pending_sig = signo;
3419 * Set the signal handler for the specified signal. The routine figures
3420 * out what it should be set to.
3423 setsignal(int signo)
3426 char cur_act, new_act;
3427 struct sigaction act;
3431 if (t != NULL) { /* trap for this sig is set */
3433 if (t[0] == '\0') /* trap is "": ignore this sig */
3437 if (rootshell && new_act == S_DFL) {
3440 if (iflag || minusc || sflag == 0)
3449 * "In all cases, bash ignores SIGQUIT. Non-builtin
3450 * commands run by bash have signal handlers
3451 * set to the values inherited by the shell
3452 * from its parent". */
3468 //TODO: if !rootshell, we reset SIGQUIT to DFL,
3469 //whereas we have to restore it to what shell got on entry
3470 //from the parent. See comment above
3472 t = &sigmode[signo - 1];
3475 /* current setting is not yet known */
3476 if (sigaction(signo, NULL, &act)) {
3477 /* pretend it worked; maybe we should give a warning,
3478 * but other shells don't. We don't alter sigmode,
3479 * so we retry every time.
3480 * btw, in Linux it never fails. --vda */
3483 if (act.sa_handler == SIG_IGN) {
3484 cur_act = S_HARD_IGN;
3486 && (signo == SIGTSTP || signo == SIGTTIN || signo == SIGTTOU)
3488 cur_act = S_IGN; /* don't hard ignore these */
3492 if (cur_act == S_HARD_IGN || cur_act == new_act)
3495 act.sa_handler = SIG_DFL;
3498 act.sa_handler = signal_handler;
3501 act.sa_handler = SIG_IGN;
3505 /* flags and mask matter only if !DFL and !IGN, but we do it
3506 * for all cases for more deterministic behavior:
3509 sigfillset(&act.sa_mask);
3511 sigaction_set(signo, &act);
3516 /* mode flags for set_curjob */
3517 #define CUR_DELETE 2
3518 #define CUR_RUNNING 1
3519 #define CUR_STOPPED 0
3521 /* mode flags for dowait */
3522 #define DOWAIT_NONBLOCK WNOHANG
3523 #define DOWAIT_BLOCK 0
3526 /* pgrp of shell on invocation */
3527 static int initialpgrp; //references:2
3528 static int ttyfd = -1; //5
3531 static struct job *jobtab; //5
3533 static unsigned njobs; //4
3535 static struct job *curjob; //lots
3536 /* number of presumed living untracked jobs */
3537 static int jobless; //4
3540 set_curjob(struct job *jp, unsigned mode)
3543 struct job **jpp, **curp;
3545 /* first remove from list */
3546 jpp = curp = &curjob;
3551 jpp = &jp1->prev_job;
3553 *jpp = jp1->prev_job;
3555 /* Then re-insert in correct position */
3563 /* job being deleted */
3566 /* newly created job or backgrounded job,
3567 put after all stopped jobs. */
3571 if (!jp1 || jp1->state != JOBSTOPPED)
3574 jpp = &jp1->prev_job;
3580 /* newly stopped job - becomes curjob */
3581 jp->prev_job = *jpp;
3589 jobno(const struct job *jp)
3591 return jp - jobtab + 1;
3596 * Convert a job name to a job structure.
3599 #define getjob(name, getctl) getjob(name)
3602 getjob(const char *name, int getctl)
3606 const char *err_msg = "%s: no such job";
3610 char *(*match)(const char *, const char *);
3625 if (c == '+' || c == '%') {
3627 err_msg = "No current job";
3633 err_msg = "No previous job";
3644 jp = jobtab + num - 1;
3659 if (match(jp->ps[0].ps_cmd, p)) {
3663 err_msg = "%s: ambiguous";
3673 err_msg = "job %s not created under job control";
3674 if (getctl && jp->jobctl == 0)
3679 ash_msg_and_raise_error(err_msg, name);
3683 * Mark a job structure as unused.
3686 freejob(struct job *jp)
3688 struct procstat *ps;
3692 for (i = jp->nprocs, ps = jp->ps; --i >= 0; ps++) {
3693 if (ps->ps_cmd != nullstr)
3696 if (jp->ps != &jp->ps0)
3699 set_curjob(jp, CUR_DELETE);
3705 xtcsetpgrp(int fd, pid_t pgrp)
3707 if (tcsetpgrp(fd, pgrp))
3708 ash_msg_and_raise_error("can't set tty process group (%m)");
3712 * Turn job control on and off.
3714 * Note: This code assumes that the third arg to ioctl is a character
3715 * pointer, which is true on Berkeley systems but not System V. Since
3716 * System V doesn't have job control yet, this isn't a problem now.
3718 * Called with interrupts off.
3726 if (on == doing_jobctl || rootshell == 0)
3730 ofd = fd = open(_PATH_TTY, O_RDWR);
3732 /* BTW, bash will try to open(ttyname(0)) if open("/dev/tty") fails.
3733 * That sometimes helps to acquire controlling tty.
3734 * Obviously, a workaround for bugs when someone
3735 * failed to provide a controlling tty to bash! :) */
3741 fd = fcntl(fd, F_DUPFD, 10);
3746 /* fd is a tty at this point */
3747 close_on_exec_on(fd);
3748 while (1) { /* while we are in the background */
3749 pgrp = tcgetpgrp(fd);
3752 ash_msg("can't access tty; job control turned off");
3756 if (pgrp == getpgrp())
3767 xtcsetpgrp(fd, pgrp);
3769 /* turning job control off */
3772 /* was xtcsetpgrp, but this can make exiting ash
3773 * loop forever if pty is already deleted */
3774 tcsetpgrp(fd, pgrp);
3788 static int FAST_FUNC
3789 killcmd(int argc, char **argv)
3791 if (argv[1] && strcmp(argv[1], "-l") != 0) {
3794 if (argv[i][0] == '%') {
3796 * "kill %N" - job kill
3797 * Converting to pgrp / pid kill
3803 jp = getjob(argv[i], 0);
3805 * In jobs started under job control, we signal
3806 * entire process group by kill -PGRP_ID.
3807 * This happens, f.e., in interactive shell.
3809 * Otherwise, we signal each child via
3810 * kill PID1 PID2 PID3.
3812 * sh -c 'sleep 1|sleep 1 & kill %1'
3813 * sh -c 'true|sleep 2 & sleep 1; kill %1'
3814 * sh -c 'true|sleep 1 & sleep 2; kill %1'
3816 n = jp->nprocs; /* can't be 0 (I hope) */
3819 dst = alloca(n * sizeof(int)*4);
3821 for (j = 0; j < n; j++) {
3822 struct procstat *ps = &jp->ps[j];
3823 /* Skip non-running and not-stopped members
3824 * (i.e. dead members) of the job
3826 if (ps->ps_status != -1 && !WIFSTOPPED(ps->ps_status))
3829 * kill_main has matching code to expect
3830 * leading space. Needed to not confuse
3831 * negative pids with "kill -SIGNAL_NO" syntax
3833 dst += sprintf(dst, jp->jobctl ? " -%u" : " %u", (int)ps->ps_pid);
3837 } while (argv[++i]);
3839 return kill_main(argc, argv);
3843 showpipe(struct job *jp /*, FILE *out*/)
3845 struct procstat *ps;
3846 struct procstat *psend;
3848 psend = jp->ps + jp->nprocs;
3849 for (ps = jp->ps + 1; ps < psend; ps++)
3850 printf(" | %s", ps->ps_cmd);
3851 outcslow('\n', stdout);
3852 flush_stdout_stderr();
3857 restartjob(struct job *jp, int mode)
3859 struct procstat *ps;
3865 if (jp->state == JOBDONE)
3867 jp->state = JOBRUNNING;
3868 pgid = jp->ps[0].ps_pid;
3869 if (mode == FORK_FG)
3870 xtcsetpgrp(ttyfd, pgid);
3871 killpg(pgid, SIGCONT);
3875 if (WIFSTOPPED(ps->ps_status)) {
3881 status = (mode == FORK_FG) ? waitforjob(jp) : 0;
3886 static int FAST_FUNC
3887 fg_bgcmd(int argc UNUSED_PARAM, char **argv)
3893 mode = (**argv == 'f') ? FORK_FG : FORK_BG;
3897 jp = getjob(*argv, 1);
3898 if (mode == FORK_BG) {
3899 set_curjob(jp, CUR_RUNNING);
3900 printf("[%d] ", jobno(jp));
3902 out1str(jp->ps[0].ps_cmd);
3903 showpipe(jp /*, stdout*/);
3904 retval = restartjob(jp, mode);
3905 } while (*argv && *++argv);
3911 sprint_status(char *s, int status, int sigonly)
3917 if (!WIFEXITED(status)) {
3919 if (WIFSTOPPED(status))
3920 st = WSTOPSIG(status);
3923 st = WTERMSIG(status);
3925 if (st == SIGINT || st == SIGPIPE)
3928 if (WIFSTOPPED(status))
3933 //TODO: use bbox's get_signame? strsignal adds ~600 bytes to text+rodata
3934 col = fmtstr(s, 32, strsignal(st));
3935 if (WCOREDUMP(status)) {
3936 col += fmtstr(s + col, 16, " (core dumped)");
3938 } else if (!sigonly) {
3939 st = WEXITSTATUS(status);
3941 col = fmtstr(s, 16, "Done(%d)", st);
3943 col = fmtstr(s, 16, "Done");
3950 dowait(int wait_flags, struct job *job)
3955 struct job *thisjob;
3958 TRACE(("dowait(0x%x) called\n", wait_flags));
3960 /* Do a wait system call. If job control is compiled in, we accept
3961 * stopped processes. wait_flags may have WNOHANG, preventing blocking.
3962 * NB: _not_ safe_waitpid, we need to detect EINTR */
3964 wait_flags |= WUNTRACED;
3965 pid = waitpid(-1, &status, wait_flags);
3966 TRACE(("wait returns pid=%d, status=0x%x, errno=%d(%s)\n",
3967 pid, status, errno, strerror(errno)));
3973 for (jp = curjob; jp; jp = jp->prev_job) {
3974 struct procstat *ps;
3975 struct procstat *psend;
3976 if (jp->state == JOBDONE)
3980 psend = ps + jp->nprocs;
3982 if (ps->ps_pid == pid) {
3983 TRACE(("Job %d: changing status of proc %d "
3984 "from 0x%x to 0x%x\n",
3985 jobno(jp), pid, ps->ps_status, status));
3986 ps->ps_status = status;
3989 if (ps->ps_status == -1)
3992 if (state == JOBRUNNING)
3994 if (WIFSTOPPED(ps->ps_status)) {
3995 jp->stopstatus = ps->ps_status;
3999 } while (++ps < psend);
4004 if (!WIFSTOPPED(status))
4010 if (state != JOBRUNNING) {
4011 thisjob->changed = 1;
4013 if (thisjob->state != state) {
4014 TRACE(("Job %d: changing state from %d to %d\n",
4015 jobno(thisjob), thisjob->state, state));
4016 thisjob->state = state;
4018 if (state == JOBSTOPPED) {
4019 set_curjob(thisjob, CUR_STOPPED);
4028 if (thisjob && thisjob == job) {
4032 len = sprint_status(s, status, 1);
4043 blocking_wait_with_raise_on_sig(void)
4045 pid_t pid = dowait(DOWAIT_BLOCK, NULL);
4046 if (pid <= 0 && pending_sig)
4047 raise_exception(EXSIG);
4053 showjob(FILE *out, struct job *jp, int mode)
4055 struct procstat *ps;
4056 struct procstat *psend;
4063 if (mode & SHOW_ONLY_PGID) { /* jobs -p */
4064 /* just output process (group) id of pipeline */
4065 fprintf(out, "%d\n", ps->ps_pid);
4069 col = fmtstr(s, 16, "[%d] ", jobno(jp));
4074 else if (curjob && jp == curjob->prev_job)
4077 if (mode & SHOW_PIDS)
4078 col += fmtstr(s + col, 16, "%d ", ps->ps_pid);
4080 psend = ps + jp->nprocs;
4082 if (jp->state == JOBRUNNING) {
4083 strcpy(s + col, "Running");
4084 col += sizeof("Running") - 1;
4086 int status = psend[-1].ps_status;
4087 if (jp->state == JOBSTOPPED)
4088 status = jp->stopstatus;
4089 col += sprint_status(s + col, status, 0);
4091 /* By now, "[JOBID]* [maybe PID] STATUS" is printed */
4093 /* This loop either prints "<cmd1> | <cmd2> | <cmd3>" line
4094 * or prints several "PID | <cmdN>" lines,
4095 * depending on SHOW_PIDS bit.
4096 * We do not print status of individual processes
4097 * between PID and <cmdN>. bash does it, but not very well:
4098 * first line shows overall job status, not process status,
4099 * making it impossible to know 1st process status.
4103 /* for each process */
4106 if (mode & SHOW_PIDS)
4107 col = fmtstr(s, 48, "\n%*c%d ", indent_col, ' ', ps->ps_pid) - 1;
4109 fprintf(out, "%s%*c%s%s",
4111 33 - col >= 0 ? 33 - col : 0, ' ',
4112 ps == jp->ps ? "" : "| ",
4115 } while (++ps != psend);
4116 outcslow('\n', out);
4120 if (jp->state == JOBDONE) {
4121 TRACE(("showjob: freeing job %d\n", jobno(jp)));
4127 * Print a list of jobs. If "change" is nonzero, only print jobs whose
4128 * statuses have changed since the last call to showjobs.
4131 showjobs(FILE *out, int mode)
4135 TRACE(("showjobs(0x%x) called\n", mode));
4137 /* Handle all finished jobs */
4138 while (dowait(DOWAIT_NONBLOCK, NULL) > 0)
4141 for (jp = curjob; jp; jp = jp->prev_job) {
4142 if (!(mode & SHOW_CHANGED) || jp->changed) {
4143 showjob(out, jp, mode);
4148 static int FAST_FUNC
4149 jobscmd(int argc UNUSED_PARAM, char **argv)
4154 while ((m = nextopt("lp")) != '\0') {
4158 mode |= SHOW_ONLY_PGID;
4164 showjob(stdout, getjob(*argv, 0), mode);
4167 showjobs(stdout, mode);
4174 /* Called only on finished or stopped jobs (no members are running) */
4176 getstatus(struct job *job)
4180 struct procstat *ps;
4182 /* Fetch last member's status */
4183 ps = job->ps + job->nprocs - 1;
4184 status = ps->ps_status;
4186 /* "set -o pipefail" mode: use last _nonzero_ status */
4187 while (status == 0 && --ps >= job->ps)
4188 status = ps->ps_status;
4191 retval = WEXITSTATUS(status);
4192 if (!WIFEXITED(status)) {
4194 retval = WSTOPSIG(status);
4195 if (!WIFSTOPPED(status))
4198 /* XXX: limits number of signals */
4199 retval = WTERMSIG(status);
4201 if (retval == SIGINT)
4207 TRACE(("getstatus: job %d, nproc %d, status 0x%x, retval 0x%x\n",
4208 jobno(job), job->nprocs, status, retval));
4212 static int FAST_FUNC
4213 waitcmd(int argc UNUSED_PARAM, char **argv)
4220 raise_exception(EXSIG);
4227 /* wait for all jobs */
4231 if (!jp) /* no running procs */
4233 if (jp->state == JOBRUNNING)
4238 blocking_wait_with_raise_on_sig();
4240 * "When bash is waiting for an asynchronous command via
4241 * the wait builtin, the reception of a signal for which a trap
4242 * has been set will cause the wait builtin to return immediately
4243 * with an exit status greater than 128, immediately after which
4244 * the trap is executed."
4246 * blocking_wait_with_raise_on_sig raises signal handlers
4247 * if it gets no pid (pid < 0). However,
4248 * if child sends us a signal *and immediately exits*,
4249 * blocking_wait_with_raise_on_sig gets pid > 0
4250 * and does not handle pending_sig. Check this case: */
4252 raise_exception(EXSIG);
4258 if (**argv != '%') {
4259 pid_t pid = number(*argv);
4264 if (job->ps[job->nprocs - 1].ps_pid == pid)
4266 job = job->prev_job;
4269 job = getjob(*argv, 0);
4271 /* loop until process terminated or stopped */
4272 while (job->state == JOBRUNNING)
4273 blocking_wait_with_raise_on_sig();
4275 retval = getstatus(job);
4288 struct job *jp, *jq;
4290 len = njobs * sizeof(*jp);
4292 jp = ckrealloc(jq, len + 4 * sizeof(*jp));
4294 offset = (char *)jp - (char *)jq;
4296 /* Relocate pointers */
4299 jq = (struct job *)((char *)jq + l);
4303 #define joff(p) ((struct job *)((char *)(p) + l))
4304 #define jmove(p) (p) = (void *)((char *)(p) + offset)
4305 if (joff(jp)->ps == &jq->ps0)
4306 jmove(joff(jp)->ps);
4307 if (joff(jp)->prev_job)
4308 jmove(joff(jp)->prev_job);
4318 jp = (struct job *)((char *)jp + len);
4322 } while (--jq >= jp);
4327 * Return a new job structure.
4328 * Called with interrupts off.
4331 makejob(/*union node *node,*/ int nprocs)
4336 for (i = njobs, jp = jobtab; ; jp++) {
4343 if (jp->state != JOBDONE || !jp->waited)
4352 memset(jp, 0, sizeof(*jp));
4354 /* jp->jobctl is a bitfield.
4355 * "jp->jobctl |= jobctl" likely to give awful code */
4359 jp->prev_job = curjob;
4364 jp->ps = ckmalloc(nprocs * sizeof(struct procstat));
4366 TRACE(("makejob(%d) returns %%%d\n", nprocs,
4373 * Return a string identifying a command (to be printed by the
4376 static char *cmdnextc;
4379 cmdputs(const char *s)
4381 static const char vstype[VSTYPE + 1][3] = {
4382 "", "}", "-", "+", "?", "=",
4383 "%", "%%", "#", "##"
4384 IF_ASH_BASH_COMPAT(, ":", "/", "//")
4387 const char *p, *str;
4391 unsigned char subtype = 0;
4395 nextc = makestrspace((strlen(s) + 1) * 8, cmdnextc);
4397 while ((c = *p++) != '\0') {
4405 if ((subtype & VSTYPE) == VSLENGTH)
4409 if (!(subtype & VSQUOTE) == !(quoted & 1))
4415 str = "\"}" + !(quoted & 1);
4422 case CTLBACKQ+CTLQUOTE:
4425 #if ENABLE_SH_MATH_SUPPORT
4440 if ((subtype & VSTYPE) != VSNORMAL)
4442 str = vstype[subtype & VSTYPE];
4443 if (subtype & VSNUL)
4452 /* These can only happen inside quotes */
4465 while ((c = *str++) != '\0') {
4468 } /* while *p++ not NUL */
4471 USTPUTC('"', nextc);
4477 /* cmdtxt() and cmdlist() call each other */
4478 static void cmdtxt(union node *n);
4481 cmdlist(union node *np, int sep)
4483 for (; np; np = np->narg.next) {
4487 if (sep && np->narg.next)
4493 cmdtxt(union node *n)
4496 struct nodelist *lp;
4507 lp = n->npipe.cmdlist;
4525 cmdtxt(n->nbinary.ch1);
4541 cmdtxt(n->nif.test);
4543 if (n->nif.elsepart) {
4544 cmdtxt(n->nif.ifpart);
4546 n = n->nif.elsepart;
4564 cmdtxt(n->nbinary.ch1);
4574 cmdputs(n->nfor.var);
4576 cmdlist(n->nfor.args, 1);
4581 cmdputs(n->narg.text);
4585 cmdlist(n->ncmd.args, 1);
4586 cmdlist(n->ncmd.redirect, 0);
4599 cmdputs(n->ncase.expr->narg.text);
4601 for (np = n->ncase.cases; np; np = np->nclist.next) {
4602 cmdtxt(np->nclist.pattern);
4604 cmdtxt(np->nclist.body);
4618 #if ENABLE_ASH_BASH_COMPAT
4633 cmdputs(utoa(n->nfile.fd));
4635 if (n->type == NTOFD || n->type == NFROMFD) {
4636 cmdputs(utoa(n->ndup.dupfd));
4645 commandtext(union node *n)
4649 STARTSTACKSTR(cmdnextc);
4651 name = stackblock();
4652 TRACE(("commandtext: name %p, end %p\n\t\"%s\"\n",
4653 name, cmdnextc, cmdnextc));
4654 return ckstrdup(name);
4659 * Fork off a subshell. If we are doing job control, give the subshell its
4660 * own process group. Jp is a job structure that the job is to be added to.
4661 * N is the command that will be evaluated by the child. Both jp and n may
4662 * be NULL. The mode parameter can be one of the following:
4663 * FORK_FG - Fork off a foreground process.
4664 * FORK_BG - Fork off a background process.
4665 * FORK_NOJOB - Like FORK_FG, but don't give the process its own
4666 * process group even if job control is on.
4668 * When job control is turned off, background processes have their standard
4669 * input redirected to /dev/null (except for the second and later processes
4672 * Called with interrupts off.
4675 * Clear traps on a fork.
4682 for (tp = trap; tp < &trap[NSIG]; tp++) {
4683 if (*tp && **tp) { /* trap not NULL or "" (SIG_IGN) */
4685 if (trap_ptr == trap)
4687 /* else: it "belongs" to trap_ptr vector, don't free */
4689 if ((tp - trap) != 0)
4690 setsignal(tp - trap);
4697 /* Lives far away from here, needed for forkchild */
4698 static void closescript(void);
4700 /* Called after fork(), in child */
4701 static NOINLINE void
4702 forkchild(struct job *jp, union node *n, int mode)
4706 TRACE(("Child shell %d\n", getpid()));
4710 /* man bash: "Non-builtin commands run by bash have signal handlers
4711 * set to the values inherited by the shell from its parent".
4712 * Do we do it correctly? */
4716 if (mode == FORK_NOJOB /* is it `xxx` ? */
4717 && n && n->type == NCMD /* is it single cmd? */
4718 /* && n->ncmd.args->type == NARG - always true? */
4719 && n->ncmd.args && strcmp(n->ncmd.args->narg.text, "trap") == 0
4720 && n->ncmd.args->narg.next == NULL /* "trap" with no arguments */
4721 /* && n->ncmd.args->narg.backquote == NULL - do we need to check this? */
4723 TRACE(("Trap hack\n"));
4724 /* Awful hack for `trap` or $(trap).
4726 * http://www.opengroup.org/onlinepubs/009695399/utilities/trap.html
4727 * contains an example where "trap" is executed in a subshell:
4729 * save_traps=$(trap)
4731 * eval "$save_traps"
4733 * Standard does not say that "trap" in subshell shall print
4734 * parent shell's traps. It only says that its output
4735 * must have suitable form, but then, in the above example
4736 * (which is not supposed to be normative), it implies that.
4738 * bash (and probably other shell) does implement it
4739 * (traps are reset to defaults, but "trap" still shows them),
4740 * but as a result, "trap" logic is hopelessly messed up:
4743 * trap -- 'echo Ho' SIGWINCH <--- we have a handler
4744 * # (trap) <--- trap is in subshell - no output (correct, traps are reset)
4745 * # true | trap <--- trap is in subshell - no output (ditto)
4746 * # echo `true | trap` <--- in subshell - output (but traps are reset!)
4747 * trap -- 'echo Ho' SIGWINCH
4748 * # echo `(trap)` <--- in subshell in subshell - output
4749 * trap -- 'echo Ho' SIGWINCH
4750 * # echo `true | (trap)` <--- in subshell in subshell in subshell - output!
4751 * trap -- 'echo Ho' SIGWINCH
4753 * The rules when to forget and when to not forget traps
4754 * get really complex and nonsensical.
4756 * Our solution: ONLY bare $(trap) or `trap` is special.
4758 /* Save trap handler strings for trap builtin to print */
4759 trap_ptr = memcpy(xmalloc(sizeof(trap)), trap, sizeof(trap));
4760 /* Fall through into clearing traps */
4764 /* do job control only in root shell */
4766 if (mode != FORK_NOJOB && jp->jobctl && oldlvl == 0) {
4769 if (jp->nprocs == 0)
4772 pgrp = jp->ps[0].ps_pid;
4773 /* this can fail because we are doing it in the parent also */
4775 if (mode == FORK_FG)
4776 xtcsetpgrp(ttyfd, pgrp);
4781 if (mode == FORK_BG) {
4782 /* man bash: "When job control is not in effect,
4783 * asynchronous commands ignore SIGINT and SIGQUIT" */
4786 if (jp->nprocs == 0) {
4788 if (open(bb_dev_null, O_RDONLY) != 0)
4789 ash_msg_and_raise_error("can't open '%s'", bb_dev_null);
4793 if (iflag) { /* why if iflag only? */
4798 * "In all cases, bash ignores SIGQUIT. Non-builtin
4799 * commands run by bash have signal handlers
4800 * set to the values inherited by the shell
4802 * Take care of the second rule: */
4806 if (n && n->type == NCMD
4807 && n->ncmd.args && strcmp(n->ncmd.args->narg.text, "jobs") == 0
4809 TRACE(("Job hack\n"));
4810 /* "jobs": we do not want to clear job list for it,
4811 * instead we remove only _its_ own_ job from job list.
4812 * This makes "jobs .... | cat" more useful.
4818 for (jp = curjob; jp; jp = jp->prev_job)
4823 /* Called after fork(), in parent */
4825 #define forkparent(jp, n, mode, pid) forkparent(jp, mode, pid)
4828 forkparent(struct job *jp, union node *n, int mode, pid_t pid)
4830 TRACE(("In parent shell: child = %d\n", pid));
4832 while (jobless && dowait(DOWAIT_NONBLOCK, NULL) > 0)
4838 if (mode != FORK_NOJOB && jp->jobctl) {
4841 if (jp->nprocs == 0)
4844 pgrp = jp->ps[0].ps_pid;
4845 /* This can fail because we are doing it in the child also */
4849 if (mode == FORK_BG) {
4850 backgndpid = pid; /* set $! */
4851 set_curjob(jp, CUR_RUNNING);
4854 struct procstat *ps = &jp->ps[jp->nprocs++];
4857 ps->ps_cmd = nullstr;
4859 if (doing_jobctl && n)
4860 ps->ps_cmd = commandtext(n);
4866 forkshell(struct job *jp, union node *n, int mode)
4870 TRACE(("forkshell(%%%d, %p, %d) called\n", jobno(jp), n, mode));
4873 TRACE(("Fork failed, errno=%d", errno));
4876 ash_msg_and_raise_error("can't fork");
4879 CLEAR_RANDOM_T(&random_gen); /* or else $RANDOM repeats in child */
4880 forkchild(jp, n, mode);
4882 forkparent(jp, n, mode, pid);
4888 * Wait for job to finish.
4890 * Under job control we have the problem that while a child process
4891 * is running interrupts generated by the user are sent to the child
4892 * but not to the shell. This means that an infinite loop started by
4893 * an interactive user may be hard to kill. With job control turned off,
4894 * an interactive user may place an interactive program inside a loop.
4895 * If the interactive program catches interrupts, the user doesn't want
4896 * these interrupts to also abort the loop. The approach we take here
4897 * is to have the shell ignore interrupt signals while waiting for a
4898 * foreground process to terminate, and then send itself an interrupt
4899 * signal if the child process was terminated by an interrupt signal.
4900 * Unfortunately, some programs want to do a bit of cleanup and then
4901 * exit on interrupt; unless these processes terminate themselves by
4902 * sending a signal to themselves (instead of calling exit) they will
4903 * confuse this approach.
4905 * Called with interrupts off.
4908 waitforjob(struct job *jp)
4912 TRACE(("waitforjob(%%%d) called\n", jobno(jp)));
4915 while (jp->state == JOBRUNNING) {
4916 /* In non-interactive shells, we _can_ get
4917 * a keyboard signal here and be EINTRed,
4918 * but we just loop back, waiting for command to complete.
4921 * "If bash is waiting for a command to complete and receives
4922 * a signal for which a trap has been set, the trap
4923 * will not be executed until the command completes."
4925 * Reality is that even if trap is not set, bash
4926 * will not act on the signal until command completes.
4927 * Try this. sleep5intoff.c:
4928 * #include <signal.h>
4929 * #include <unistd.h>
4932 * sigemptyset(&set);
4933 * sigaddset(&set, SIGINT);
4934 * sigaddset(&set, SIGQUIT);
4935 * sigprocmask(SIG_BLOCK, &set, NULL);
4939 * $ bash -c './sleep5intoff; echo hi'
4940 * ^C^C^C^C <--- pressing ^C once a second
4942 * $ bash -c './sleep5intoff; echo hi'
4943 * ^\^\^\^\hi <--- pressing ^\ (SIGQUIT)
4946 dowait(DOWAIT_BLOCK, jp);
4953 xtcsetpgrp(ttyfd, rootpid);
4955 * This is truly gross.
4956 * If we're doing job control, then we did a TIOCSPGRP which
4957 * caused us (the shell) to no longer be in the controlling
4958 * session -- so we wouldn't have seen any ^C/SIGINT. So, we
4959 * intuit from the subprocess exit status whether a SIGINT
4960 * occurred, and if so interrupt ourselves. Yuck. - mycroft
4962 if (jp->sigint) /* TODO: do the same with all signals */
4963 raise(SIGINT); /* ... by raise(jp->sig) instead? */
4965 if (jp->state == JOBDONE)
4972 * return 1 if there are stopped jobs, otherwise 0
4984 if (jp && jp->state == JOBSTOPPED) {
4985 out2str("You have stopped jobs.\n");
4994 /* ============ redir.c
4996 * Code for dealing with input/output redirection.
5001 #define EMPTY -2 /* marks an unused slot in redirtab */
5002 #define CLOSED -3 /* marks a slot of previously-closed fd */
5005 * Open a file in noclobber mode.
5006 * The code was copied from bash.
5009 noclobberopen(const char *fname)
5012 struct stat finfo, finfo2;
5015 * If the file exists and is a regular file, return an error
5018 r = stat(fname, &finfo);
5019 if (r == 0 && S_ISREG(finfo.st_mode)) {
5025 * If the file was not present (r != 0), make sure we open it
5026 * exclusively so that if it is created before we open it, our open
5027 * will fail. Make sure that we do not truncate an existing file.
5028 * Note that we don't turn on O_EXCL unless the stat failed -- if the
5029 * file was not a regular file, we leave O_EXCL off.
5032 return open(fname, O_WRONLY|O_CREAT|O_EXCL, 0666);
5033 fd = open(fname, O_WRONLY|O_CREAT, 0666);
5035 /* If the open failed, return the file descriptor right away. */
5040 * OK, the open succeeded, but the file may have been changed from a
5041 * non-regular file to a regular file between the stat and the open.
5042 * We are assuming that the O_EXCL open handles the case where FILENAME
5043 * did not exist and is symlinked to an existing file between the stat
5048 * If we can open it and fstat the file descriptor, and neither check
5049 * revealed that it was a regular file, and the file has not been
5050 * replaced, return the file descriptor.
5052 if (fstat(fd, &finfo2) == 0
5053 && !S_ISREG(finfo2.st_mode)
5054 && finfo.st_dev == finfo2.st_dev
5055 && finfo.st_ino == finfo2.st_ino
5060 /* The file has been replaced. badness. */
5067 * Handle here documents. Normally we fork off a process to write the
5068 * data to a pipe. If the document is short, we can stuff the data in
5069 * the pipe without forking.
5071 /* openhere needs this forward reference */
5072 static void expandhere(union node *arg, int fd);
5074 openhere(union node *redir)
5080 ash_msg_and_raise_error("pipe call failed");
5081 if (redir->type == NHERE) {
5082 len = strlen(redir->nhere.doc->narg.text);
5083 if (len <= PIPE_BUF) {
5084 full_write(pip[1], redir->nhere.doc->narg.text, len);
5088 if (forkshell((struct job *)NULL, (union node *)NULL, FORK_NOJOB) == 0) {
5091 ignoresig(SIGINT); //signal(SIGINT, SIG_IGN);
5092 ignoresig(SIGQUIT); //signal(SIGQUIT, SIG_IGN);
5093 ignoresig(SIGHUP); //signal(SIGHUP, SIG_IGN);
5094 ignoresig(SIGTSTP); //signal(SIGTSTP, SIG_IGN);
5095 signal(SIGPIPE, SIG_DFL);
5096 if (redir->type == NHERE)
5097 full_write(pip[1], redir->nhere.doc->narg.text, len);
5099 expandhere(redir->nhere.doc, pip[1]);
5100 _exit(EXIT_SUCCESS);
5108 openredirect(union node *redir)
5113 fname = redir->nfile.expfname;
5114 switch (redir->nfile.type) {
5116 f = open(fname, O_RDONLY);
5121 f = open(fname, O_RDWR|O_CREAT, 0666);
5126 #if ENABLE_ASH_BASH_COMPAT
5129 /* Take care of noclobber mode. */
5131 f = noclobberopen(fname);
5138 f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666);
5143 f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666);
5151 /* Fall through to eliminate warning. */
5152 /* Our single caller does this itself */
5159 f = openhere(redir);
5165 ash_msg_and_raise_error("can't create %s: %s", fname, errmsg(errno, "nonexistent directory"));
5167 ash_msg_and_raise_error("can't open %s: %s", fname, errmsg(errno, "no such file"));
5171 * Copy a file descriptor to be >= to. Returns -1
5172 * if the source file descriptor is closed, EMPTY if there are no unused
5173 * file descriptors left.
5175 /* 0x800..00: bit to set in "to" to request dup2 instead of fcntl(F_DUPFD).
5176 * old code was doing close(to) prior to copyfd() to achieve the same */
5178 COPYFD_EXACT = (int)~(INT_MAX),
5179 COPYFD_RESTORE = (int)((unsigned)COPYFD_EXACT >> 1),
5182 copyfd(int from, int to)
5186 if (to & COPYFD_EXACT) {
5187 to &= ~COPYFD_EXACT;
5189 newfd = dup2(from, to);
5191 newfd = fcntl(from, F_DUPFD, to);
5194 if (errno == EMFILE)
5196 /* Happens when source fd is not open: try "echo >&99" */
5197 ash_msg_and_raise_error("%d: %m", from);
5202 /* Struct def and variable are moved down to the first usage site */
5207 struct redirtab *next;
5210 struct two_fd_t two_fd[];
5212 #define redirlist (G_var.redirlist)
5214 static int need_to_remember(struct redirtab *rp, int fd)
5218 if (!rp) /* remembering was not requested */
5221 for (i = 0; i < rp->pair_count; i++) {
5222 if (rp->two_fd[i].orig == fd) {
5223 /* already remembered */
5230 /* "hidden" fd is a fd used to read scripts, or a copy of such */
5231 static int is_hidden_fd(struct redirtab *rp, int fd)
5234 struct parsefile *pf;
5238 /* Check open scripts' fds */
5241 /* We skip pf_fd == 0 case because of the following case:
5242 * $ ash # running ash interactively
5244 * and in script.sh: "exec 9>&0".
5245 * Even though top-level pf_fd _is_ 0,
5246 * it's still ok to use it: "read" builtin uses it,
5247 * why should we cripple "exec" builtin?
5249 if (pf->pf_fd > 0 && fd == pf->pf_fd) {
5257 /* Check saved fds of redirects */
5258 fd |= COPYFD_RESTORE;
5259 for (i = 0; i < rp->pair_count; i++) {
5260 if (rp->two_fd[i].copy == fd) {
5268 * Process a list of redirection commands. If the REDIR_PUSH flag is set,
5269 * old file descriptors are stashed away so that the redirection can be
5270 * undone by calling popredir.
5272 /* flags passed to redirect */
5273 #define REDIR_PUSH 01 /* save previous values of file descriptors */
5274 #define REDIR_SAVEFD2 03 /* set preverrout */
5276 redirect(union node *redir, int flags)
5278 struct redirtab *sv;
5283 int copied_fd2 = -1;
5293 if (flags & REDIR_PUSH) {
5294 union node *tmp = redir;
5297 #if ENABLE_ASH_BASH_COMPAT
5298 if (tmp->nfile.type == NTO2)
5301 tmp = tmp->nfile.next;
5303 sv = ckmalloc(sizeof(*sv) + sv_pos * sizeof(sv->two_fd[0]));
5304 sv->next = redirlist;
5305 sv->pair_count = sv_pos;
5307 sv->nullredirs = g_nullredirs - 1;
5309 while (sv_pos > 0) {
5311 sv->two_fd[sv_pos].orig = sv->two_fd[sv_pos].copy = EMPTY;
5317 fd = redir->nfile.fd;
5318 if (redir->nfile.type == NTOFD || redir->nfile.type == NFROMFD) {
5319 right_fd = redir->ndup.dupfd;
5320 //bb_error_msg("doing %d > %d", fd, right_fd);
5321 /* redirect from/to same file descriptor? */
5324 /* "echo >&10" and 10 is a fd opened to a sh script? */
5325 if (is_hidden_fd(sv, right_fd)) {
5326 errno = EBADF; /* as if it is closed */
5327 ash_msg_and_raise_error("%d: %m", right_fd);
5331 newfd = openredirect(redir); /* always >= 0 */
5333 /* Descriptor wasn't open before redirect.
5334 * Mark it for close in the future */
5335 if (need_to_remember(sv, fd)) {
5336 goto remember_to_close;
5341 #if ENABLE_ASH_BASH_COMPAT
5344 if (need_to_remember(sv, fd)) {
5345 /* Copy old descriptor */
5346 /* Careful to not accidentally "save"
5347 * to the same fd as right side fd in N>&M */
5348 int minfd = right_fd < 10 ? 10 : right_fd + 1;
5349 i = fcntl(fd, F_DUPFD, minfd);
5350 /* You'd expect copy to be CLOEXECed. Currently these extra "saved" fds
5351 * are closed in popredir() in the child, preventing them from leaking
5352 * into child. (popredir() also cleans up the mess in case of failures)
5357 /* Strange error (e.g. "too many files" EMFILE?) */
5361 ash_msg_and_raise_error("%d: %m", fd);
5364 /* EBADF: it is not open - good, remember to close it */
5367 } else { /* fd is open, save its copy */
5368 /* "exec fd>&-" should not close fds
5369 * which point to script file(s).
5370 * Force them to be restored afterwards */
5371 if (is_hidden_fd(sv, fd))
5372 i |= COPYFD_RESTORE;
5376 sv->two_fd[sv_pos].orig = fd;
5377 sv->two_fd[sv_pos].copy = i;
5381 /* NTOFD/NFROMFD: copy redir->ndup.dupfd to fd */
5382 if (redir->ndup.dupfd < 0) { /* "fd>&-" */
5383 /* Don't want to trigger debugging */
5387 copyfd(redir->ndup.dupfd, fd | COPYFD_EXACT);
5389 } else if (fd != newfd) { /* move newfd to fd */
5390 copyfd(newfd, fd | COPYFD_EXACT);
5391 #if ENABLE_ASH_BASH_COMPAT
5392 if (!(redir->nfile.type == NTO2 && fd == 2))
5396 #if ENABLE_ASH_BASH_COMPAT
5397 if (redir->nfile.type == NTO2 && fd == 1) {
5398 /* We already redirected it to fd 1, now copy it to 2 */
5404 } while ((redir = redir->nfile.next) != NULL);
5407 if ((flags & REDIR_SAVEFD2) && copied_fd2 >= 0)
5408 preverrout_fd = copied_fd2;
5412 * Undo the effects of the last redirection.
5415 popredir(int drop, int restore)
5417 struct redirtab *rp;
5420 if (--g_nullredirs >= 0)
5424 for (i = 0; i < rp->pair_count; i++) {
5425 int fd = rp->two_fd[i].orig;
5426 int copy = rp->two_fd[i].copy;
5427 if (copy == CLOSED) {
5432 if (copy != EMPTY) {
5433 if (!drop || (restore && (copy & COPYFD_RESTORE))) {
5434 copy &= ~COPYFD_RESTORE;
5436 copyfd(copy, fd | COPYFD_EXACT);
5438 close(copy & ~COPYFD_RESTORE);
5441 redirlist = rp->next;
5442 g_nullredirs = rp->nullredirs;
5448 * Undo all redirections. Called on error or interrupt.
5452 * Discard all saved file descriptors.
5455 clearredir(int drop)
5461 popredir(drop, /*restore:*/ 0);
5466 redirectsafe(union node *redir, int flags)
5469 volatile int saveint;
5470 struct jmploc *volatile savehandler = exception_handler;
5471 struct jmploc jmploc;
5474 /* "echo 9>/dev/null; echo >&9; echo result: $?" - result should be 1, not 2! */
5475 err = setjmp(jmploc.loc); // huh?? was = setjmp(jmploc.loc) * 2;
5477 exception_handler = &jmploc;
5478 redirect(redir, flags);
5480 exception_handler = savehandler;
5481 if (err && exception_type != EXERROR)
5482 longjmp(exception_handler->loc, 1);
5483 RESTORE_INT(saveint);
5488 /* ============ Routines to expand arguments to commands
5490 * We have to deal with backquotes, shell variables, and file metacharacters.
5493 #if ENABLE_SH_MATH_SUPPORT
5495 ash_arith(const char *s)
5497 arith_state_t math_state;
5500 math_state.lookupvar = lookupvar;
5501 math_state.setvar = setvar2;
5502 //math_state.endofname = endofname;
5505 result = arith(&math_state, s);
5506 if (math_state.errmsg)
5507 ash_msg_and_raise_error(math_state.errmsg);
5517 #define EXP_FULL 0x1 /* perform word splitting & file globbing */
5518 #define EXP_TILDE 0x2 /* do normal tilde expansion */
5519 #define EXP_VARTILDE 0x4 /* expand tildes in an assignment */
5520 #define EXP_REDIR 0x8 /* file glob for a redirection (1 match only) */
5521 #define EXP_CASE 0x10 /* keeps quotes around for CASE pattern */
5522 #define EXP_RECORD 0x20 /* need to record arguments for ifs breakup */
5523 #define EXP_VARTILDE2 0x40 /* expand tildes after colons only */
5524 #define EXP_WORD 0x80 /* expand word in parameter expansion */
5525 #define EXP_QWORD 0x100 /* expand word in quoted parameter expansion */
5529 #define RMESCAPE_ALLOC 0x1 /* Allocate a new string */
5530 #define RMESCAPE_GLOB 0x2 /* Add backslashes for glob */
5531 #define RMESCAPE_QUOTED 0x4 /* Remove CTLESC unless in quotes */
5532 #define RMESCAPE_GROW 0x8 /* Grow strings instead of stalloc */
5533 #define RMESCAPE_HEAP 0x10 /* Malloc strings instead of stalloc */
5536 * Structure specifying which parts of the string should be searched
5537 * for IFS characters.
5540 struct ifsregion *next; /* next region in list */
5541 int begoff; /* offset of start of region */
5542 int endoff; /* offset of end of region */
5543 int nulonly; /* search for nul bytes only */
5547 struct strlist *list;
5548 struct strlist **lastp;
5551 /* output of current string */
5552 static char *expdest;
5553 /* list of back quote expressions */
5554 static struct nodelist *argbackq;
5555 /* first struct in list of ifs regions */
5556 static struct ifsregion ifsfirst;
5557 /* last struct in list */
5558 static struct ifsregion *ifslastp;
5559 /* holds expanded arg list */
5560 static struct arglist exparg;
5565 #if !ENABLE_SH_MATH_SUPPORT
5566 /* cvtnum() is used even if math support is off (to prepare $? values and such) */
5567 typedef long arith_t;
5568 # define ARITH_FMT "%ld"
5575 expdest = makestrspace(32, expdest);
5576 len = fmtstr(expdest, 32, ARITH_FMT, num);
5577 STADJUST(len, expdest);
5582 esclen(const char *start, const char *p)
5586 while (p > start && (unsigned char)*--p == CTLESC) {
5593 * Remove any CTLESC characters from a string.
5596 rmescapes(char *str, int flag)
5598 static const char qchars[] ALIGN1 = { CTLESC, CTLQUOTEMARK, '\0' };
5602 unsigned protect_against_glob;
5605 p = strpbrk(str, qchars);
5611 if (flag & RMESCAPE_ALLOC) {
5612 size_t len = p - str;
5613 size_t fulllen = len + strlen(p) + 1;
5615 if (flag & RMESCAPE_GROW) {
5616 int strloc = str - (char *)stackblock();
5617 r = makestrspace(fulllen, expdest);
5618 /* p and str may be invalidated by makestrspace */
5619 str = (char *)stackblock() + strloc;
5621 } else if (flag & RMESCAPE_HEAP) {
5622 r = ckmalloc(fulllen);
5624 r = stalloc(fulllen);
5628 q = (char *)memcpy(q, str, len) + len;
5632 inquotes = (flag & RMESCAPE_QUOTED) ^ RMESCAPE_QUOTED;
5633 globbing = flag & RMESCAPE_GLOB;
5634 protect_against_glob = globbing;
5636 if ((unsigned char)*p == CTLQUOTEMARK) {
5637 // TODO: if no RMESCAPE_QUOTED in flags, inquotes never becomes 0
5638 // (alternates between RMESCAPE_QUOTED and ~RMESCAPE_QUOTED). Is it ok?
5639 // Note: both inquotes and protect_against_glob only affect whether
5640 // CTLESC,<ch> gets converted to <ch> or to \<ch>
5641 inquotes = ~inquotes;
5643 protect_against_glob = globbing;
5647 /* naked back slash */
5648 protect_against_glob = 0;
5651 if ((unsigned char)*p == CTLESC) {
5653 if (protect_against_glob && inquotes && *p != '/') {
5657 protect_against_glob = globbing;
5662 if (flag & RMESCAPE_GROW) {
5664 STADJUST(q - r + 1, expdest);
5668 #define pmatch(a, b) !fnmatch((a), (b), 0)
5671 * Prepare a pattern for a expmeta (internal glob(3)) call.
5673 * Returns an stalloced string.
5676 preglob(const char *pattern, int quoted, int flag)
5678 flag |= RMESCAPE_GLOB;
5680 flag |= RMESCAPE_QUOTED;
5682 return rmescapes((char *)pattern, flag);
5686 * Put a string on the stack.
5689 memtodest(const char *p, size_t len, int syntax, int quotes)
5693 q = makestrspace(quotes ? len * 2 : len, q);
5696 unsigned char c = *p++;
5700 int n = SIT(c, syntax);
5701 if (n == CCTL || n == CBACK)
5711 strtodest(const char *p, int syntax, int quotes)
5713 memtodest(p, strlen(p), syntax, quotes);
5717 * Record the fact that we have to scan this region of the
5718 * string for IFS characters.
5721 recordregion(int start, int end, int nulonly)
5723 struct ifsregion *ifsp;
5725 if (ifslastp == NULL) {
5729 ifsp = ckzalloc(sizeof(*ifsp));
5730 /*ifsp->next = NULL; - ckzalloc did it */
5731 ifslastp->next = ifsp;
5735 ifslastp->begoff = start;
5736 ifslastp->endoff = end;
5737 ifslastp->nulonly = nulonly;
5741 removerecordregions(int endoff)
5743 if (ifslastp == NULL)
5746 if (ifsfirst.endoff > endoff) {
5747 while (ifsfirst.next) {
5748 struct ifsregion *ifsp;
5750 ifsp = ifsfirst.next->next;
5751 free(ifsfirst.next);
5752 ifsfirst.next = ifsp;
5755 if (ifsfirst.begoff > endoff) {
5758 ifslastp = &ifsfirst;
5759 ifsfirst.endoff = endoff;
5764 ifslastp = &ifsfirst;
5765 while (ifslastp->next && ifslastp->next->begoff < endoff)
5766 ifslastp = ifslastp->next;
5767 while (ifslastp->next) {
5768 struct ifsregion *ifsp;
5770 ifsp = ifslastp->next->next;
5771 free(ifslastp->next);
5772 ifslastp->next = ifsp;
5775 if (ifslastp->endoff > endoff)
5776 ifslastp->endoff = endoff;
5780 exptilde(char *startp, char *p, int flags)
5786 int quotes = flags & (EXP_FULL | EXP_CASE | EXP_REDIR);
5791 while ((c = *++p) != '\0') {
5798 if (flags & EXP_VARTILDE)
5808 if (*name == '\0') {
5809 home = lookupvar("HOME");
5811 pw = getpwnam(name);
5816 if (!home || !*home)
5819 startloc = expdest - (char *)stackblock();
5820 strtodest(home, SQSYNTAX, quotes);
5821 recordregion(startloc, expdest - (char *)stackblock(), 0);
5829 * Execute a command inside back quotes. If it's a builtin command, we
5830 * want to save its output in a block obtained from malloc. Otherwise
5831 * we fork off a subprocess and get the output of the command via a pipe.
5832 * Should be called with interrupts off.
5834 struct backcmd { /* result of evalbackcmd */
5835 int fd; /* file descriptor to read from */
5836 int nleft; /* number of chars in buffer */
5837 char *buf; /* buffer */
5838 struct job *jp; /* job structure for command */
5841 /* These forward decls are needed to use "eval" code for backticks handling: */
5842 static uint8_t back_exitstatus; /* exit status of backquoted command */
5843 #define EV_EXIT 01 /* exit after evaluating tree */
5844 static void evaltree(union node *, int);
5846 static void FAST_FUNC
5847 evalbackcmd(union node *n, struct backcmd *result)
5858 saveherefd = herefd;
5866 ash_msg_and_raise_error("pipe call failed");
5867 jp = makejob(/*n,*/ 1);
5868 if (forkshell(jp, n, FORK_NOJOB) == 0) {
5873 copyfd(pip[1], 1 | COPYFD_EXACT);
5877 evaltree(n, EV_EXIT); /* actually evaltreenr... */
5881 result->fd = pip[0];
5884 herefd = saveherefd;
5886 TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n",
5887 result->fd, result->buf, result->nleft, result->jp));
5891 * Expand stuff in backwards quotes.
5894 expbackq(union node *cmd, int quoted, int quotes)
5902 int syntax = quoted ? DQSYNTAX : BASESYNTAX;
5903 struct stackmark smark;
5906 setstackmark(&smark);
5908 startloc = dest - (char *)stackblock();
5910 evalbackcmd(cmd, &in);
5911 popstackmark(&smark);
5918 memtodest(p, i, syntax, quotes);
5922 i = nonblock_immune_read(in.fd, buf, sizeof(buf), /*loop_on_EINTR:*/ 1);
5923 TRACE(("expbackq: read returns %d\n", i));
5932 back_exitstatus = waitforjob(in.jp);
5936 /* Eat all trailing newlines */
5938 for (; dest > (char *)stackblock() && dest[-1] == '\n';)
5943 recordregion(startloc, dest - (char *)stackblock(), 0);
5944 TRACE(("evalbackq: size:%d:'%.*s'\n",
5945 (int)((dest - (char *)stackblock()) - startloc),
5946 (int)((dest - (char *)stackblock()) - startloc),
5947 stackblock() + startloc));
5950 #if ENABLE_SH_MATH_SUPPORT
5952 * Expand arithmetic expression. Backup to start of expression,
5953 * evaluate, place result in (backed up) result, adjust string position.
5966 * This routine is slightly over-complicated for
5967 * efficiency. Next we scan backwards looking for the
5968 * start of arithmetic.
5970 start = stackblock();
5977 while ((unsigned char)*p != CTLARI) {
5981 ash_msg_and_raise_error("missing CTLARI (shouldn't happen)");
5986 esc = esclen(start, p);
5996 removerecordregions(begoff);
6003 rmescapes(p + 2, 0);
6005 len = cvtnum(ash_arith(p + 2));
6008 recordregion(begoff, begoff + len, 0);
6012 /* argstr needs it */
6013 static char *evalvar(char *p, int flags, struct strlist *var_str_list);
6016 * Perform variable and command substitution. If EXP_FULL is set, output CTLESC
6017 * characters to allow for further processing. Otherwise treat
6018 * $@ like $* since no splitting will be performed.
6020 * var_str_list (can be NULL) is a list of "VAR=val" strings which take precedence
6021 * over shell varables. Needed for "A=a B=$A; echo $B" case - we use it
6022 * for correct expansion of "B=$A" word.
6025 argstr(char *p, int flags, struct strlist *var_str_list)
6027 static const char spclchars[] ALIGN1 = {
6035 CTLBACKQ | CTLQUOTE,
6036 #if ENABLE_SH_MATH_SUPPORT
6041 const char *reject = spclchars;
6042 int quotes = flags & (EXP_FULL | EXP_CASE | EXP_REDIR); /* do CTLESC */
6043 int breakall = flags & EXP_WORD;
6048 if (!(flags & EXP_VARTILDE)) {
6050 } else if (flags & EXP_VARTILDE2) {
6055 if (flags & EXP_TILDE) {
6058 flags &= ~EXP_TILDE;
6061 if ((unsigned char)*q == CTLESC && (flags & EXP_QWORD))
6064 p = exptilde(p, q, flags);
6067 startloc = expdest - (char *)stackblock();
6071 length += strcspn(p + length, reject);
6075 IF_SH_MATH_SUPPORT(|| c == CTLENDARI)
6077 /* c == '=' || c == ':' || c == CTLENDARI */
6083 expdest = stack_nputstr(p, length, expdest);
6084 newloc = expdest - (char *)stackblock();
6085 if (breakall && !inquotes && newloc > startloc) {
6086 recordregion(startloc, newloc, 0);
6097 if (flags & EXP_VARTILDE2) {
6101 flags |= EXP_VARTILDE2;
6106 * sort of a hack - expand tildes in variable
6107 * assignments (after the first '=' and after ':'s).
6116 case CTLENDVAR: /* ??? */
6119 /* "$@" syntax adherence hack */
6121 && memcmp(p, dolatstr, 4) == 0
6122 && ( p[4] == (char)CTLQUOTEMARK
6123 || (p[4] == (char)CTLENDVAR && p[5] == (char)CTLQUOTEMARK)
6126 p = evalvar(p + 1, flags, /* var_str_list: */ NULL) + 1;
6129 inquotes = !inquotes;
6142 TRACE(("argstr: evalvar('%s')\n", p));
6143 p = evalvar(p, flags, var_str_list);
6144 TRACE(("argstr: evalvar:'%s'\n", (char *)stackblock()));
6148 case CTLBACKQ|CTLQUOTE:
6149 expbackq(argbackq->n, c, quotes);
6150 argbackq = argbackq->next;
6152 #if ENABLE_SH_MATH_SUPPORT
6164 scanleft(char *startp, char *rmesc, char *rmescend UNUSED_PARAM,
6165 char *pattern, int quotes, int zero)
6174 const char *s = loc2;
6181 match = pmatch(pattern, s);
6186 if (quotes && (unsigned char)*loc == CTLESC)
6195 scanright(char *startp, char *rmesc, char *rmescend,
6196 char *pattern, int quotes, int match_at_start)
6198 #if !ENABLE_ASH_OPTIMIZE_FOR_SIZE
6199 int try2optimize = match_at_start;
6205 /* If we called by "${v/pattern/repl}" or "${v//pattern/repl}":
6206 * startp="escaped_value_of_v" rmesc="raw_value_of_v"
6207 * rmescend=""(ptr to NUL in rmesc) pattern="pattern" quotes=match_at_start=1
6209 * loc starts at NUL at the end of startp, loc2 starts at the end of rmesc,
6210 * and on each iteration they go back two/one char until they reach the beginning.
6211 * We try to find a match in "raw_value_of_v", "raw_value_of_", "raw_value_of" etc.
6213 /* TODO: document in what other circumstances we are called. */
6215 for (loc = pattern - 1, loc2 = rmescend; loc >= startp; loc2--) {
6218 const char *s = loc2;
6219 if (match_at_start) {
6223 match = pmatch(pattern, s);
6224 //bb_error_msg("pmatch(pattern:'%s',s:'%s'):%d", pattern, s, match);
6228 #if !ENABLE_ASH_OPTIMIZE_FOR_SIZE
6230 /* Maybe we can optimize this:
6231 * if pattern ends with unescaped *, we can avoid checking
6232 * shorter strings: if "foo*" doesnt match "raw_value_of_v",
6233 * it wont match truncated "raw_value_of_" strings too.
6235 unsigned plen = strlen(pattern);
6236 /* Does it end with "*"? */
6237 if (plen != 0 && pattern[--plen] == '*') {
6238 /* "xxxx*" is not escaped */
6239 /* "xxx\*" is escaped */
6240 /* "xx\\*" is not escaped */
6241 /* "x\\\*" is escaped */
6243 while (plen != 0 && pattern[--plen] == '\\')
6246 break; /* ends with unescaped "*" */
6254 esc = esclen(startp, loc);
6265 static void varunset(const char *, const char *, const char *, int) NORETURN;
6267 varunset(const char *end, const char *var, const char *umsg, int varflags)
6273 msg = "parameter not set";
6275 if ((unsigned char)*end == CTLENDVAR) {
6276 if (varflags & VSNUL)
6282 ash_msg_and_raise_error("%.*s: %s%s", (int)(end - var - 1), var, msg, tail);
6285 #if ENABLE_ASH_BASH_COMPAT
6287 parse_sub_pattern(char *arg, int varflags)
6289 char *idx, *repl = NULL;
6292 //char *org_arg = arg;
6293 //bb_error_msg("arg:'%s' varflags:%x", arg, varflags);
6300 /* Only the first '/' seen is our separator */
6309 * Example: v='ab\c'; echo ${v/\\b/_\\_\z_}
6310 * The result is a_\_z_c (not a\_\_z_c)!
6312 * Enable debug prints in this function and you'll see:
6313 * ash: arg:'\\b/_\\_z_' varflags:d
6314 * ash: pattern:'\\b' repl:'_\_z_'
6315 * That is, \\b is interpreted as \\b, but \\_ as \_!
6316 * IOW: search pattern and replace string treat backslashes
6317 * differently! That is the reason why we check repl below:
6319 if (c == '\\' && *arg == '\\' && repl && !(varflags & VSQUOTE))
6320 arg++; /* skip both '\', not just first one */
6323 //bb_error_msg("pattern:'%s' repl:'%s'", org_arg, repl);
6327 #endif /* ENABLE_ASH_BASH_COMPAT */
6330 subevalvar(char *p, char *varname, int strloc, int subtype,
6331 int startloc, int varflags, int quotes, struct strlist *var_str_list)
6333 struct nodelist *saveargbackq = argbackq;
6336 char *rmesc, *rmescend;
6338 IF_ASH_BASH_COMPAT(const char *repl = NULL;)
6339 IF_ASH_BASH_COMPAT(int pos, len, orig_len;)
6340 int saveherefd = herefd;
6341 int amount, workloc, resetloc;
6343 char *(*scan)(char*, char*, char*, char*, int, int);
6345 //bb_error_msg("subevalvar(p:'%s',varname:'%s',strloc:%d,subtype:%d,startloc:%d,varflags:%x,quotes:%d)",
6346 // p, varname, strloc, subtype, startloc, varflags, quotes);
6349 argstr(p, (subtype != VSASSIGN && subtype != VSQUESTION) ? EXP_CASE : 0,
6351 STPUTC('\0', expdest);
6352 herefd = saveherefd;
6353 argbackq = saveargbackq;
6354 startp = (char *)stackblock() + startloc;
6358 setvar(varname, startp, 0);
6359 amount = startp - expdest;
6360 STADJUST(amount, expdest);
6364 varunset(p, varname, startp, varflags);
6367 #if ENABLE_ASH_BASH_COMPAT
6369 loc = str = stackblock() + strloc;
6370 /* Read POS in ${var:POS:LEN} */
6371 pos = atoi(loc); /* number(loc) errors out on "1:4" */
6372 len = str - startp - 1;
6374 /* *loc != '\0', guaranteed by parser */
6378 /* Adjust the length by the number of escapes */
6379 for (ptr = startp; ptr < (str - 1); ptr++) {
6380 if ((unsigned char)*ptr == CTLESC) {
6388 if (*loc++ == ':') {
6392 /* Skip POS in ${var:POS:LEN} */
6394 while (*loc && *loc != ':') {
6396 * bash complains on: var=qwe; echo ${var:1a:123}
6398 ash_msg_and_raise_error(msg_illnum, str);
6402 if (*loc++ == ':') {
6406 if (pos >= orig_len) {
6410 if (len > (orig_len - pos))
6411 len = orig_len - pos;
6413 for (str = startp; pos; str++, pos--) {
6414 if (quotes && (unsigned char)*str == CTLESC)
6417 for (loc = startp; len; len--) {
6418 if (quotes && (unsigned char)*str == CTLESC)
6423 amount = loc - expdest;
6424 STADJUST(amount, expdest);
6429 resetloc = expdest - (char *)stackblock();
6431 /* We'll comeback here if we grow the stack while handling
6432 * a VSREPLACE or VSREPLACEALL, since our pointers into the
6433 * stack will need rebasing, and we'll need to remove our work
6436 IF_ASH_BASH_COMPAT(restart:)
6438 amount = expdest - ((char *)stackblock() + resetloc);
6439 STADJUST(-amount, expdest);
6440 startp = (char *)stackblock() + startloc;
6443 rmescend = (char *)stackblock() + strloc;
6445 rmesc = rmescapes(startp, RMESCAPE_ALLOC | RMESCAPE_GROW);
6446 if (rmesc != startp) {
6448 startp = (char *)stackblock() + startloc;
6452 str = (char *)stackblock() + strloc;
6453 preglob(str, varflags & VSQUOTE, 0);
6454 workloc = expdest - (char *)stackblock();
6456 #if ENABLE_ASH_BASH_COMPAT
6457 if (subtype == VSREPLACE || subtype == VSREPLACEALL) {
6461 repl = parse_sub_pattern(str, varflags);
6462 //bb_error_msg("repl:'%s'", repl);
6467 /* If there's no pattern to match, return the expansion unmolested */
6476 loc = scanright(idx, rmesc, rmescend, str, quotes, 1);
6477 //bb_error_msg("scanright('%s'):'%s'", str, loc);
6479 /* No match, advance */
6480 char *restart_detect = stackblock();
6482 STPUTC(*idx, expdest);
6483 if (quotes && (unsigned char)*idx == CTLESC) {
6486 STPUTC(*idx, expdest);
6488 if (stackblock() != restart_detect)
6493 /* continue; - prone to quadratic behavior, smarter code: */
6496 if (str[0] == '*') {
6497 /* Pattern is "*foo". If "*foo" does not match "long_string",
6498 * it would never match "ong_string" etc, no point in trying.
6505 if (subtype == VSREPLACEALL) {
6507 if (quotes && (unsigned char)*idx == CTLESC)
6516 //bb_error_msg("repl:'%s'", repl);
6517 for (loc = (char*)repl; *loc; loc++) {
6518 char *restart_detect = stackblock();
6519 if (quotes && *loc == '\\') {
6520 STPUTC(CTLESC, expdest);
6523 STPUTC(*loc, expdest);
6524 if (stackblock() != restart_detect)
6529 if (subtype == VSREPLACE) {
6530 //bb_error_msg("tail:'%s', quotes:%x", idx, quotes);
6532 char *restart_detect = stackblock();
6533 STPUTC(*idx, expdest);
6534 if (stackblock() != restart_detect)
6543 /* We've put the replaced text into a buffer at workloc, now
6544 * move it to the right place and adjust the stack.
6546 STPUTC('\0', expdest);
6547 startp = (char *)stackblock() + startloc;
6548 memmove(startp, (char *)stackblock() + workloc, len + 1);
6549 //bb_error_msg("startp:'%s'", startp);
6550 amount = expdest - (startp + len);
6551 STADJUST(-amount, expdest);
6554 #endif /* ENABLE_ASH_BASH_COMPAT */
6556 subtype -= VSTRIMRIGHT;
6558 if (subtype < 0 || subtype > 7)
6561 /* zero = (subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX) */
6562 zero = subtype >> 1;
6563 /* VSTRIMLEFT/VSTRIMRIGHTMAX -> scanleft */
6564 scan = (subtype & 1) ^ zero ? scanleft : scanright;
6566 loc = scan(startp, rmesc, rmescend, str, quotes, zero);
6569 memmove(startp, loc, str - loc);
6570 loc = startp + (str - loc) - 1;
6573 amount = loc - expdest;
6574 STADJUST(amount, expdest);
6580 * Add the value of a specialized variable to the stack string.
6581 * name parameter (examples):
6582 * ash -c 'echo $1' name:'1='
6583 * ash -c 'echo $qwe' name:'qwe='
6584 * ash -c 'echo $$' name:'$='
6585 * ash -c 'echo ${$}' name:'$='
6586 * ash -c 'echo ${$##q}' name:'$=q'
6587 * ash -c 'echo ${#$}' name:'$='
6588 * note: examples with bad shell syntax:
6589 * ash -c 'echo ${#$1}' name:'$=1'
6590 * ash -c 'echo ${#1#}' name:'1=#'
6592 static NOINLINE ssize_t
6593 varvalue(char *name, int varflags, int flags, struct strlist *var_str_list)
6600 int subtype = varflags & VSTYPE;
6601 int quotes = flags & (EXP_FULL | EXP_CASE | EXP_REDIR);
6602 int quoted = varflags & VSQUOTE;
6603 int syntax = quoted ? DQSYNTAX : BASESYNTAX;
6613 num = shellparam.nparam;
6621 goto check_1char_name;
6623 expdest = makestrspace(NOPTS, expdest);
6624 for (i = NOPTS - 1; i >= 0; i--) {
6626 USTPUTC(optletters(i), expdest);
6632 /* handles cases similar to ${#$1} */
6633 if (name[2] != '\0')
6634 raise_error_syntax("bad substitution");
6641 if (quoted && (flags & EXP_FULL)) {
6642 /* note: this is not meant as PEOF value */
6643 sep = 1 << CHAR_BIT;
6648 sep = ifsset() ? (unsigned char)(ifsval()[0]) : ' ';
6649 i = SIT(sep, syntax);
6650 if (quotes && (i == CCTL || i == CBACK))
6656 while ((p = *ap++) != NULL) {
6659 partlen = strlen(p);
6662 if (!(subtype == VSPLUS || subtype == VSLENGTH))
6663 memtodest(p, partlen, syntax, quotes);
6669 if (subtype == VSPLUS || subtype == VSLENGTH) {
6675 /* note: may put NUL despite sep != 0
6676 * (see sep = 1 << CHAR_BIT above) */
6682 } /* case '@' and '*' */
6693 num = atoi(name); /* number(name) fails on ${N#str} etc */
6694 if (num < 0 || num > shellparam.nparam)
6696 p = num ? shellparam.p[num - 1] : arg0;
6699 /* NB: name has form "VAR=..." */
6701 /* "A=a B=$A" case: var_str_list is a list of "A=a" strings
6702 * which should be considered before we check variables. */
6704 unsigned name_len = (strchrnul(name, '=') - name) + 1;
6708 str = var_str_list->text;
6709 eq = strchr(str, '=');
6710 if (!eq) /* stop at first non-assignment */
6713 if (name_len == (unsigned)(eq - str)
6714 && strncmp(str, name, name_len) == 0
6717 /* goto value; - WRONG! */
6718 /* think "A=1 A=2 B=$A" */
6720 var_str_list = var_str_list->next;
6721 } while (var_str_list);
6725 p = lookupvar(name);
6731 if (!(subtype == VSPLUS || subtype == VSLENGTH))
6732 memtodest(p, len, syntax, quotes);
6736 if (subtype == VSPLUS || subtype == VSLENGTH)
6737 STADJUST(-len, expdest);
6742 * Expand a variable, and return a pointer to the next character in the
6746 evalvar(char *p, int flags, struct strlist *var_str_list)
6757 varflags = (unsigned char) *p++;
6758 subtype = varflags & VSTYPE;
6759 quoted = varflags & VSQUOTE;
6761 easy = (!quoted || (*var == '@' && shellparam.nparam));
6762 startloc = expdest - (char *)stackblock();
6763 p = strchr(p, '=') + 1; //TODO: use var_end(p)?
6766 varlen = varvalue(var, varflags, flags, var_str_list);
6767 if (varflags & VSNUL)
6770 if (subtype == VSPLUS) {
6771 varlen = -1 - varlen;
6775 if (subtype == VSMINUS) {
6780 flags | (quoted ? EXP_TILDE|EXP_QWORD : EXP_TILDE|EXP_WORD),
6790 if (subtype == VSASSIGN || subtype == VSQUESTION) {
6792 if (subevalvar(p, var, /* strloc: */ 0,
6793 subtype, startloc, varflags,
6799 * Remove any recorded regions beyond
6802 removerecordregions(startloc);
6812 if (varlen < 0 && uflag)
6813 varunset(p, var, 0, 0);
6815 if (subtype == VSLENGTH) {
6816 cvtnum(varlen > 0 ? varlen : 0);
6820 if (subtype == VSNORMAL) {
6831 case VSTRIMRIGHTMAX:
6832 #if ENABLE_ASH_BASH_COMPAT
6845 * Terminate the string and start recording the pattern
6848 STPUTC('\0', expdest);
6849 patloc = expdest - (char *)stackblock();
6850 if (NULL == subevalvar(p, /* varname: */ NULL, patloc, subtype,
6852 /* quotes: */ flags & (EXP_FULL | EXP_CASE | EXP_REDIR),
6855 int amount = expdest - (
6856 (char *)stackblock() + patloc - 1
6858 STADJUST(-amount, expdest);
6860 /* Remove any recorded regions beyond start of variable */
6861 removerecordregions(startloc);
6863 recordregion(startloc, expdest - (char *)stackblock(), quoted);
6867 if (subtype != VSNORMAL) { /* skip to end of alternative */
6870 unsigned char c = *p++;
6873 else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) {
6875 argbackq = argbackq->next;
6876 } else if (c == CTLVAR) {
6877 if ((*p++ & VSTYPE) != VSNORMAL)
6879 } else if (c == CTLENDVAR) {
6889 * Break the argument string into pieces based upon IFS and add the
6890 * strings to the argument list. The regions of the string to be
6891 * searched for IFS characters have been stored by recordregion.
6894 ifsbreakup(char *string, struct arglist *arglist)
6896 struct ifsregion *ifsp;
6901 const char *ifs, *realifs;
6906 if (ifslastp != NULL) {
6909 realifs = ifsset() ? ifsval() : defifs;
6912 p = string + ifsp->begoff;
6913 nulonly = ifsp->nulonly;
6914 ifs = nulonly ? nullstr : realifs;
6916 while (p < string + ifsp->endoff) {
6918 if ((unsigned char)*p == CTLESC)
6920 if (!strchr(ifs, *p)) {
6925 ifsspc = (strchr(defifs, *p) != NULL);
6926 /* Ignore IFS whitespace at start */
6927 if (q == start && ifsspc) {
6933 sp = stzalloc(sizeof(*sp));
6935 *arglist->lastp = sp;
6936 arglist->lastp = &sp->next;
6940 if (p >= string + ifsp->endoff) {
6944 if ((unsigned char)*p == CTLESC)
6946 if (strchr(ifs, *p) == NULL) {
6950 if (strchr(defifs, *p) == NULL) {
6965 } while (ifsp != NULL);
6974 sp = stzalloc(sizeof(*sp));
6976 *arglist->lastp = sp;
6977 arglist->lastp = &sp->next;
6983 struct ifsregion *p;
6988 struct ifsregion *ifsp;
6994 ifsfirst.next = NULL;
6999 * Add a file name to the list.
7002 addfname(const char *name)
7006 sp = stzalloc(sizeof(*sp));
7007 sp->text = ststrdup(name);
7009 exparg.lastp = &sp->next;
7013 * Do metacharacter (i.e. *, ?, [...]) expansion.
7016 expmeta(char *expdir, char *enddir, char *name)
7031 for (p = name; *p; p++) {
7032 if (*p == '*' || *p == '?')
7034 else if (*p == '[') {
7041 if (*q == '/' || *q == '\0')
7048 } else if (*p == '\\')
7050 else if (*p == '/') {
7057 if (metaflag == 0) { /* we've reached the end of the file name */
7058 if (enddir != expdir)
7066 if (metaflag == 0 || lstat(expdir, &statb) >= 0)
7077 } while (p < start);
7079 if (enddir == expdir) {
7081 } else if (enddir == expdir + 1 && *expdir == '/') {
7090 if (enddir != expdir)
7092 if (*endname == 0) {
7104 while (!pending_int && (dp = readdir(dirp)) != NULL) {
7105 if (dp->d_name[0] == '.' && !matchdot)
7107 if (pmatch(start, dp->d_name)) {
7109 strcpy(enddir, dp->d_name);
7112 for (p = enddir, cp = dp->d_name; (*p++ = *cp++) != '\0';)
7115 expmeta(expdir, p, endname);
7124 static struct strlist *
7125 msort(struct strlist *list, int len)
7127 struct strlist *p, *q = NULL;
7128 struct strlist **lpp;
7136 for (n = half; --n >= 0;) {
7140 q->next = NULL; /* terminate first half of list */
7141 q = msort(list, half); /* sort first half of list */
7142 p = msort(p, len - half); /* sort second half */
7145 #if ENABLE_LOCALE_SUPPORT
7146 if (strcoll(p->text, q->text) < 0)
7148 if (strcmp(p->text, q->text) < 0)
7172 * Sort the results of file name expansion. It calculates the number of
7173 * strings to sort and then calls msort (short for merge sort) to do the
7176 static struct strlist *
7177 expsort(struct strlist *str)
7183 for (sp = str; sp; sp = sp->next)
7185 return msort(str, len);
7189 expandmeta(struct strlist *str /*, int flag*/)
7191 static const char metachars[] ALIGN1 = {
7194 /* TODO - EXP_REDIR */
7198 struct strlist **savelastp;
7204 if (!strpbrk(str->text, metachars))
7206 savelastp = exparg.lastp;
7209 p = preglob(str->text, 0, RMESCAPE_ALLOC | RMESCAPE_HEAP);
7211 int i = strlen(str->text);
7212 expdir = ckmalloc(i < 2048 ? 2048 : i); /* XXX */
7214 expmeta(expdir, expdir, p);
7219 if (exparg.lastp == savelastp) {
7224 *exparg.lastp = str;
7225 rmescapes(str->text, 0);
7226 exparg.lastp = &str->next;
7228 *exparg.lastp = NULL;
7229 *savelastp = sp = expsort(*savelastp);
7230 while (sp->next != NULL)
7232 exparg.lastp = &sp->next;
7239 * Perform variable substitution and command substitution on an argument,
7240 * placing the resulting list of arguments in arglist. If EXP_FULL is true,
7241 * perform splitting and file name expansion. When arglist is NULL, perform
7242 * here document expansion.
7245 expandarg(union node *arg, struct arglist *arglist, int flag)
7250 argbackq = arg->narg.backquote;
7251 STARTSTACKSTR(expdest);
7252 ifsfirst.next = NULL;
7254 TRACE(("expandarg: argstr('%s',flags:%x)\n", arg->narg.text, flag));
7255 argstr(arg->narg.text, flag,
7256 /* var_str_list: */ arglist ? arglist->list : NULL);
7257 p = _STPUTC('\0', expdest);
7259 if (arglist == NULL) {
7260 return; /* here document expanded */
7262 p = grabstackstr(p);
7263 TRACE(("expandarg: p:'%s'\n", p));
7264 exparg.lastp = &exparg.list;
7268 if (flag & EXP_FULL) {
7269 ifsbreakup(p, &exparg);
7270 *exparg.lastp = NULL;
7271 exparg.lastp = &exparg.list;
7272 expandmeta(exparg.list /*, flag*/);
7274 if (flag & EXP_REDIR) { /*XXX - for now, just remove escapes */
7276 TRACE(("expandarg: rmescapes:'%s'\n", p));
7278 sp = stzalloc(sizeof(*sp));
7281 exparg.lastp = &sp->next;
7285 *exparg.lastp = NULL;
7287 *arglist->lastp = exparg.list;
7288 arglist->lastp = exparg.lastp;
7293 * Expand shell variables and backquotes inside a here document.
7296 expandhere(union node *arg, int fd)
7299 expandarg(arg, (struct arglist *)NULL, 0);
7300 full_write(fd, stackblock(), expdest - (char *)stackblock());
7304 * Returns true if the pattern matches the string.
7307 patmatch(char *pattern, const char *string)
7309 return pmatch(preglob(pattern, 0, 0), string);
7313 * See if a pattern matches in a case statement.
7316 casematch(union node *pattern, char *val)
7318 struct stackmark smark;
7321 setstackmark(&smark);
7322 argbackq = pattern->narg.backquote;
7323 STARTSTACKSTR(expdest);
7325 argstr(pattern->narg.text, EXP_TILDE | EXP_CASE,
7326 /* var_str_list: */ NULL);
7327 STACKSTRNUL(expdest);
7328 result = patmatch(stackblock(), val);
7329 popstackmark(&smark);
7334 /* ============ find_command */
7338 int (*builtin)(int, char **) FAST_FUNC;
7339 /* unsigned flags; */
7341 #define IS_BUILTIN_SPECIAL(b) ((b)->name[0] & 1)
7342 /* "regular" builtins always take precedence over commands,
7343 * regardless of PATH=....%builtin... position */
7344 #define IS_BUILTIN_REGULAR(b) ((b)->name[0] & 2)
7345 #define IS_BUILTIN_ASSIGN(b) ((b)->name[0] & 4)
7348 smallint cmdtype; /* CMDxxx */
7351 /* index >= 0 for commands without path (slashes) */
7352 /* (TODO: what exactly does the value mean? PATH position?) */
7353 /* index == -1 for commands with slashes */
7354 /* index == (-2 - applet_no) for NOFORK applets */
7355 const struct builtincmd *cmd;
7356 struct funcnode *func;
7359 /* values of cmdtype */
7360 #define CMDUNKNOWN -1 /* no entry in table for command */
7361 #define CMDNORMAL 0 /* command is an executable program */
7362 #define CMDFUNCTION 1 /* command is a shell function */
7363 #define CMDBUILTIN 2 /* command is a shell builtin */
7365 /* action to find_command() */
7366 #define DO_ERR 0x01 /* prints errors */
7367 #define DO_ABS 0x02 /* checks absolute paths */
7368 #define DO_NOFUNC 0x04 /* don't return shell functions, for command */
7369 #define DO_ALTPATH 0x08 /* using alternate path */
7370 #define DO_ALTBLTIN 0x20 /* %builtin in alt. path */
7372 static void find_command(char *, struct cmdentry *, int, const char *);
7375 /* ============ Hashing commands */
7378 * When commands are first encountered, they are entered in a hash table.
7379 * This ensures that a full path search will not have to be done for them
7380 * on each invocation.
7382 * We should investigate converting to a linear search, even though that
7383 * would make the command name "hash" a misnomer.
7387 struct tblentry *next; /* next entry in hash chain */
7388 union param param; /* definition of builtin function */
7389 smallint cmdtype; /* CMDxxx */
7390 char rehash; /* if set, cd done since entry created */
7391 char cmdname[1]; /* name of command */
7394 static struct tblentry **cmdtable;
7395 #define INIT_G_cmdtable() do { \
7396 cmdtable = xzalloc(CMDTABLESIZE * sizeof(cmdtable[0])); \
7399 static int builtinloc = -1; /* index in path of %builtin, or -1 */
7403 tryexec(IF_FEATURE_SH_STANDALONE(int applet_no,) char *cmd, char **argv, char **envp)
7405 #if ENABLE_FEATURE_SH_STANDALONE
7406 if (applet_no >= 0) {
7407 if (APPLET_IS_NOEXEC(applet_no)) {
7411 run_applet_no_and_exit(applet_no, argv);
7413 /* re-exec ourselves with the new arguments */
7414 execve(bb_busybox_exec_path, argv, envp);
7415 /* If they called chroot or otherwise made the binary no longer
7416 * executable, fall through */
7423 execve(cmd, argv, envp);
7424 } while (errno == EINTR);
7426 execve(cmd, argv, envp);
7428 if (cmd == (char*) bb_busybox_exec_path) {
7429 /* We already visited ENOEXEC branch below, don't do it again */
7430 //TODO: try execve(initial_argv0_of_shell, argv, envp) before giving up?
7434 if (errno == ENOEXEC) {
7435 /* Run "cmd" as a shell script:
7436 * http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html
7437 * "If the execve() function fails with ENOEXEC, the shell
7438 * shall execute a command equivalent to having a shell invoked
7439 * with the command name as its first operand,
7440 * with any remaining arguments passed to the new shell"
7442 * That is, do not use $SHELL, user's shell, or /bin/sh;
7443 * just call ourselves.
7445 * Note that bash reads ~80 chars of the file, and if it sees
7446 * a zero byte before it sees newline, it doesn't try to
7447 * interpret it, but fails with "cannot execute binary file"
7448 * message and exit code 126. For one, this prevents attempts
7449 * to interpret foreign ELF binaries as shell scripts.
7454 for (ap = argv; *ap; ap++)
7456 new = ckmalloc((ap - argv + 2) * sizeof(new[0]));
7457 new[0] = (char*) "ash";
7460 while ((*ap++ = *++argv) != NULL)
7462 cmd = (char*) bb_busybox_exec_path;
7469 * Exec a program. Never returns. If you change this routine, you may
7470 * have to change the find_command routine as well.
7472 static void shellexec(char **, const char *, int) NORETURN;
7474 shellexec(char **argv, const char *path, int idx)
7480 int applet_no = -1; /* used only by FEATURE_SH_STANDALONE */
7482 clearredir(/*drop:*/ 1);
7483 envp = listvars(VEXPORT, VUNSET, /*end:*/ NULL);
7484 if (strchr(argv[0], '/') != NULL
7485 #if ENABLE_FEATURE_SH_STANDALONE
7486 || (applet_no = find_applet_by_name(argv[0])) >= 0
7489 tryexec(IF_FEATURE_SH_STANDALONE(applet_no,) argv[0], argv, envp);
7490 if (applet_no >= 0) {
7491 /* We tried execing ourself, but it didn't work.
7492 * Maybe /proc/self/exe doesn't exist?
7501 while ((cmdname = path_advance(&path, argv[0])) != NULL) {
7502 if (--idx < 0 && pathopt == NULL) {
7503 tryexec(IF_FEATURE_SH_STANDALONE(-1,) cmdname, argv, envp);
7504 if (errno != ENOENT && errno != ENOTDIR)
7511 /* Map to POSIX errors */
7523 exitstatus = exerrno;
7524 TRACE(("shellexec failed for %s, errno %d, suppress_int %d\n",
7525 argv[0], e, suppress_int));
7526 ash_msg_and_raise(EXEXEC, "%s: %s", argv[0], errmsg(e, "not found"));
7531 printentry(struct tblentry *cmdp)
7537 idx = cmdp->param.index;
7540 name = path_advance(&path, cmdp->cmdname);
7542 } while (--idx >= 0);
7543 out1fmt("%s%s\n", name, (cmdp->rehash ? "*" : nullstr));
7547 * Clear out command entries. The argument specifies the first entry in
7548 * PATH which has changed.
7551 clearcmdentry(int firstchange)
7553 struct tblentry **tblp;
7554 struct tblentry **pp;
7555 struct tblentry *cmdp;
7558 for (tblp = cmdtable; tblp < &cmdtable[CMDTABLESIZE]; tblp++) {
7560 while ((cmdp = *pp) != NULL) {
7561 if ((cmdp->cmdtype == CMDNORMAL &&
7562 cmdp->param.index >= firstchange)
7563 || (cmdp->cmdtype == CMDBUILTIN &&
7564 builtinloc >= firstchange)
7577 * Locate a command in the command hash table. If "add" is nonzero,
7578 * add the command to the table if it is not already present. The
7579 * variable "lastcmdentry" is set to point to the address of the link
7580 * pointing to the entry, so that delete_cmd_entry can delete the
7583 * Interrupts must be off if called with add != 0.
7585 static struct tblentry **lastcmdentry;
7587 static struct tblentry *
7588 cmdlookup(const char *name, int add)
7590 unsigned int hashval;
7592 struct tblentry *cmdp;
7593 struct tblentry **pp;
7596 hashval = (unsigned char)*p << 4;
7598 hashval += (unsigned char)*p++;
7600 pp = &cmdtable[hashval % CMDTABLESIZE];
7601 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7602 if (strcmp(cmdp->cmdname, name) == 0)
7606 if (add && cmdp == NULL) {
7607 cmdp = *pp = ckzalloc(sizeof(struct tblentry)
7609 /* + 1 - already done because
7610 * tblentry::cmdname is char[1] */);
7611 /*cmdp->next = NULL; - ckzalloc did it */
7612 cmdp->cmdtype = CMDUNKNOWN;
7613 strcpy(cmdp->cmdname, name);
7620 * Delete the command entry returned on the last lookup.
7623 delete_cmd_entry(void)
7625 struct tblentry *cmdp;
7628 cmdp = *lastcmdentry;
7629 *lastcmdentry = cmdp->next;
7630 if (cmdp->cmdtype == CMDFUNCTION)
7631 freefunc(cmdp->param.func);
7637 * Add a new command entry, replacing any existing command entry for
7638 * the same name - except special builtins.
7641 addcmdentry(char *name, struct cmdentry *entry)
7643 struct tblentry *cmdp;
7645 cmdp = cmdlookup(name, 1);
7646 if (cmdp->cmdtype == CMDFUNCTION) {
7647 freefunc(cmdp->param.func);
7649 cmdp->cmdtype = entry->cmdtype;
7650 cmdp->param = entry->u;
7654 static int FAST_FUNC
7655 hashcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
7657 struct tblentry **pp;
7658 struct tblentry *cmdp;
7660 struct cmdentry entry;
7663 if (nextopt("r") != '\0') {
7668 if (*argptr == NULL) {
7669 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
7670 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7671 if (cmdp->cmdtype == CMDNORMAL)
7679 while ((name = *argptr) != NULL) {
7680 cmdp = cmdlookup(name, 0);
7682 && (cmdp->cmdtype == CMDNORMAL
7683 || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))
7687 find_command(name, &entry, DO_ERR, pathval());
7688 if (entry.cmdtype == CMDUNKNOWN)
7696 * Called when a cd is done. Marks all commands so the next time they
7697 * are executed they will be rehashed.
7702 struct tblentry **pp;
7703 struct tblentry *cmdp;
7705 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
7706 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7707 if (cmdp->cmdtype == CMDNORMAL
7708 || (cmdp->cmdtype == CMDBUILTIN
7709 && !IS_BUILTIN_REGULAR(cmdp->param.cmd)
7719 * Fix command hash table when PATH changed.
7720 * Called before PATH is changed. The argument is the new value of PATH;
7721 * pathval() still returns the old value at this point.
7722 * Called with interrupts off.
7724 static void FAST_FUNC
7725 changepath(const char *new)
7733 firstchange = 9999; /* assume no change */
7739 if ((*old == '\0' && *new == ':')
7740 || (*old == ':' && *new == '\0')
7744 old = new; /* ignore subsequent differences */
7748 if (*new == '%' && idx_bltin < 0 && prefix(new + 1, "builtin"))
7755 if (builtinloc < 0 && idx_bltin >= 0)
7756 builtinloc = idx_bltin; /* zap builtins */
7757 if (builtinloc >= 0 && idx_bltin < 0)
7759 clearcmdentry(firstchange);
7760 builtinloc = idx_bltin;
7775 #define TENDBQUOTE 12
7792 typedef smallint token_id_t;
7794 /* first char is indicating which tokens mark the end of a list */
7795 static const char *const tokname_array[] = {
7809 #define KWDOFFSET 13
7810 /* the following are keywords */
7829 /* Wrapper around strcmp for qsort/bsearch/... */
7831 pstrcmp(const void *a, const void *b)
7833 return strcmp((char*) a, (*(char**) b) + 1);
7836 static const char *const *
7837 findkwd(const char *s)
7839 return bsearch(s, tokname_array + KWDOFFSET,
7840 ARRAY_SIZE(tokname_array) - KWDOFFSET,
7841 sizeof(tokname_array[0]), pstrcmp);
7845 * Locate and print what a word is...
7848 describe_command(char *command, int describe_command_verbose)
7850 struct cmdentry entry;
7851 struct tblentry *cmdp;
7852 #if ENABLE_ASH_ALIAS
7853 const struct alias *ap;
7855 const char *path = pathval();
7857 if (describe_command_verbose) {
7861 /* First look at the keywords */
7862 if (findkwd(command)) {
7863 out1str(describe_command_verbose ? " is a shell keyword" : command);
7867 #if ENABLE_ASH_ALIAS
7868 /* Then look at the aliases */
7869 ap = lookupalias(command, 0);
7871 if (!describe_command_verbose) {
7876 out1fmt(" is an alias for %s", ap->val);
7880 /* Then check if it is a tracked alias */
7881 cmdp = cmdlookup(command, 0);
7883 entry.cmdtype = cmdp->cmdtype;
7884 entry.u = cmdp->param;
7886 /* Finally use brute force */
7887 find_command(command, &entry, DO_ABS, path);
7890 switch (entry.cmdtype) {
7892 int j = entry.u.index;
7898 p = path_advance(&path, command);
7902 if (describe_command_verbose) {
7904 (cmdp ? " a tracked alias for" : nullstr), p
7913 if (describe_command_verbose) {
7914 out1str(" is a shell function");
7921 if (describe_command_verbose) {
7922 out1fmt(" is a %sshell builtin",
7923 IS_BUILTIN_SPECIAL(entry.u.cmd) ?
7924 "special " : nullstr
7932 if (describe_command_verbose) {
7933 out1str(": not found\n");
7942 static int FAST_FUNC
7943 typecmd(int argc UNUSED_PARAM, char **argv)
7949 /* type -p ... ? (we don't bother checking for 'p') */
7950 if (argv[1] && argv[1][0] == '-') {
7955 err |= describe_command(argv[i++], verbose);
7960 #if ENABLE_ASH_CMDCMD
7961 static int FAST_FUNC
7962 commandcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
7970 while ((c = nextopt("pvV")) != '\0')
7972 verify |= VERIFY_VERBOSE;
7974 verify |= VERIFY_BRIEF;
7979 /* Mimic bash: just "command -v" doesn't complain, it's a nop */
7980 if (verify && (*argptr != NULL)) {
7981 return describe_command(*argptr, verify - VERIFY_BRIEF);
7989 /* ============ eval.c */
7991 static int funcblocksize; /* size of structures in function */
7992 static int funcstringsize; /* size of strings in node */
7993 static void *funcblock; /* block to allocate function from */
7994 static char *funcstring; /* block to allocate strings from */
7996 /* flags in argument to evaltree */
7997 #define EV_EXIT 01 /* exit after evaluating tree */
7998 #define EV_TESTED 02 /* exit status is checked; ignore -e flag */
7999 #define EV_BACKCMD 04 /* command executing within back quotes */
8001 static const uint8_t nodesize[N_NUMBER] = {
8002 [NCMD ] = SHELL_ALIGN(sizeof(struct ncmd)),
8003 [NPIPE ] = SHELL_ALIGN(sizeof(struct npipe)),
8004 [NREDIR ] = SHELL_ALIGN(sizeof(struct nredir)),
8005 [NBACKGND ] = SHELL_ALIGN(sizeof(struct nredir)),
8006 [NSUBSHELL] = SHELL_ALIGN(sizeof(struct nredir)),
8007 [NAND ] = SHELL_ALIGN(sizeof(struct nbinary)),
8008 [NOR ] = SHELL_ALIGN(sizeof(struct nbinary)),
8009 [NSEMI ] = SHELL_ALIGN(sizeof(struct nbinary)),
8010 [NIF ] = SHELL_ALIGN(sizeof(struct nif)),
8011 [NWHILE ] = SHELL_ALIGN(sizeof(struct nbinary)),
8012 [NUNTIL ] = SHELL_ALIGN(sizeof(struct nbinary)),
8013 [NFOR ] = SHELL_ALIGN(sizeof(struct nfor)),
8014 [NCASE ] = SHELL_ALIGN(sizeof(struct ncase)),
8015 [NCLIST ] = SHELL_ALIGN(sizeof(struct nclist)),
8016 [NDEFUN ] = SHELL_ALIGN(sizeof(struct narg)),
8017 [NARG ] = SHELL_ALIGN(sizeof(struct narg)),
8018 [NTO ] = SHELL_ALIGN(sizeof(struct nfile)),
8019 #if ENABLE_ASH_BASH_COMPAT
8020 [NTO2 ] = SHELL_ALIGN(sizeof(struct nfile)),
8022 [NCLOBBER ] = SHELL_ALIGN(sizeof(struct nfile)),
8023 [NFROM ] = SHELL_ALIGN(sizeof(struct nfile)),
8024 [NFROMTO ] = SHELL_ALIGN(sizeof(struct nfile)),
8025 [NAPPEND ] = SHELL_ALIGN(sizeof(struct nfile)),
8026 [NTOFD ] = SHELL_ALIGN(sizeof(struct ndup)),
8027 [NFROMFD ] = SHELL_ALIGN(sizeof(struct ndup)),
8028 [NHERE ] = SHELL_ALIGN(sizeof(struct nhere)),
8029 [NXHERE ] = SHELL_ALIGN(sizeof(struct nhere)),
8030 [NNOT ] = SHELL_ALIGN(sizeof(struct nnot)),
8033 static void calcsize(union node *n);
8036 sizenodelist(struct nodelist *lp)
8039 funcblocksize += SHELL_ALIGN(sizeof(struct nodelist));
8046 calcsize(union node *n)
8050 funcblocksize += nodesize[n->type];
8053 calcsize(n->ncmd.redirect);
8054 calcsize(n->ncmd.args);
8055 calcsize(n->ncmd.assign);
8058 sizenodelist(n->npipe.cmdlist);
8063 calcsize(n->nredir.redirect);
8064 calcsize(n->nredir.n);
8071 calcsize(n->nbinary.ch2);
8072 calcsize(n->nbinary.ch1);
8075 calcsize(n->nif.elsepart);
8076 calcsize(n->nif.ifpart);
8077 calcsize(n->nif.test);
8080 funcstringsize += strlen(n->nfor.var) + 1;
8081 calcsize(n->nfor.body);
8082 calcsize(n->nfor.args);
8085 calcsize(n->ncase.cases);
8086 calcsize(n->ncase.expr);
8089 calcsize(n->nclist.body);
8090 calcsize(n->nclist.pattern);
8091 calcsize(n->nclist.next);
8095 sizenodelist(n->narg.backquote);
8096 funcstringsize += strlen(n->narg.text) + 1;
8097 calcsize(n->narg.next);
8100 #if ENABLE_ASH_BASH_COMPAT
8107 calcsize(n->nfile.fname);
8108 calcsize(n->nfile.next);
8112 calcsize(n->ndup.vname);
8113 calcsize(n->ndup.next);
8117 calcsize(n->nhere.doc);
8118 calcsize(n->nhere.next);
8121 calcsize(n->nnot.com);
8127 nodeckstrdup(char *s)
8129 char *rtn = funcstring;
8131 strcpy(funcstring, s);
8132 funcstring += strlen(s) + 1;
8136 static union node *copynode(union node *);
8138 static struct nodelist *
8139 copynodelist(struct nodelist *lp)
8141 struct nodelist *start;
8142 struct nodelist **lpp;
8147 funcblock = (char *) funcblock + SHELL_ALIGN(sizeof(struct nodelist));
8148 (*lpp)->n = copynode(lp->n);
8150 lpp = &(*lpp)->next;
8157 copynode(union node *n)
8164 funcblock = (char *) funcblock + nodesize[n->type];
8168 new->ncmd.redirect = copynode(n->ncmd.redirect);
8169 new->ncmd.args = copynode(n->ncmd.args);
8170 new->ncmd.assign = copynode(n->ncmd.assign);
8173 new->npipe.cmdlist = copynodelist(n->npipe.cmdlist);
8174 new->npipe.pipe_backgnd = n->npipe.pipe_backgnd;
8179 new->nredir.redirect = copynode(n->nredir.redirect);
8180 new->nredir.n = copynode(n->nredir.n);
8187 new->nbinary.ch2 = copynode(n->nbinary.ch2);
8188 new->nbinary.ch1 = copynode(n->nbinary.ch1);
8191 new->nif.elsepart = copynode(n->nif.elsepart);
8192 new->nif.ifpart = copynode(n->nif.ifpart);
8193 new->nif.test = copynode(n->nif.test);
8196 new->nfor.var = nodeckstrdup(n->nfor.var);
8197 new->nfor.body = copynode(n->nfor.body);
8198 new->nfor.args = copynode(n->nfor.args);
8201 new->ncase.cases = copynode(n->ncase.cases);
8202 new->ncase.expr = copynode(n->ncase.expr);
8205 new->nclist.body = copynode(n->nclist.body);
8206 new->nclist.pattern = copynode(n->nclist.pattern);
8207 new->nclist.next = copynode(n->nclist.next);
8211 new->narg.backquote = copynodelist(n->narg.backquote);
8212 new->narg.text = nodeckstrdup(n->narg.text);
8213 new->narg.next = copynode(n->narg.next);
8216 #if ENABLE_ASH_BASH_COMPAT
8223 new->nfile.fname = copynode(n->nfile.fname);
8224 new->nfile.fd = n->nfile.fd;
8225 new->nfile.next = copynode(n->nfile.next);
8229 new->ndup.vname = copynode(n->ndup.vname);
8230 new->ndup.dupfd = n->ndup.dupfd;
8231 new->ndup.fd = n->ndup.fd;
8232 new->ndup.next = copynode(n->ndup.next);
8236 new->nhere.doc = copynode(n->nhere.doc);
8237 new->nhere.fd = n->nhere.fd;
8238 new->nhere.next = copynode(n->nhere.next);
8241 new->nnot.com = copynode(n->nnot.com);
8244 new->type = n->type;
8249 * Make a copy of a parse tree.
8251 static struct funcnode *
8252 copyfunc(union node *n)
8257 funcblocksize = offsetof(struct funcnode, n);
8260 blocksize = funcblocksize;
8261 f = ckmalloc(blocksize + funcstringsize);
8262 funcblock = (char *) f + offsetof(struct funcnode, n);
8263 funcstring = (char *) f + blocksize;
8270 * Define a shell function.
8273 defun(char *name, union node *func)
8275 struct cmdentry entry;
8278 entry.cmdtype = CMDFUNCTION;
8279 entry.u.func = copyfunc(func);
8280 addcmdentry(name, &entry);
8284 /* Reasons for skipping commands (see comment on breakcmd routine) */
8285 #define SKIPBREAK (1 << 0)
8286 #define SKIPCONT (1 << 1)
8287 #define SKIPFUNC (1 << 2)
8288 #define SKIPFILE (1 << 3)
8289 #define SKIPEVAL (1 << 4)
8290 static smallint evalskip; /* set to SKIPxxx if we are skipping commands */
8291 static int skipcount; /* number of levels to skip */
8292 static int funcnest; /* depth of function calls */
8293 static int loopnest; /* current loop nesting level */
8295 /* Forward decl way out to parsing code - dotrap needs it */
8296 static int evalstring(char *s, int mask);
8298 /* Called to execute a trap.
8299 * Single callsite - at the end of evaltree().
8300 * If we return non-zero, evaltree raises EXEXIT exception.
8302 * Perhaps we should avoid entering new trap handlers
8303 * while we are executing a trap handler. [is it a TODO?]
8312 savestatus = exitstatus;
8316 TRACE(("dotrap entered\n"));
8317 for (sig = 1, g = gotsig; sig < NSIG; sig++, g++) {
8324 /* non-trapped SIGINT is handled separately by raise_interrupt,
8325 * don't upset it by resetting gotsig[SIGINT-1] */
8326 if (sig == SIGINT && !t)
8329 TRACE(("sig %d is active, will run handler '%s'\n", sig, t));
8333 want_exexit = evalstring(t, SKIPEVAL);
8334 exitstatus = savestatus;
8336 TRACE(("dotrap returns %d\n", want_exexit));
8341 TRACE(("dotrap returns 0\n"));
8345 /* forward declarations - evaluation is fairly recursive business... */
8346 static void evalloop(union node *, int);
8347 static void evalfor(union node *, int);
8348 static void evalcase(union node *, int);
8349 static void evalsubshell(union node *, int);
8350 static void expredir(union node *);
8351 static void evalpipe(union node *, int);
8352 static void evalcommand(union node *, int);
8353 static int evalbltin(const struct builtincmd *, int, char **);
8354 static void prehash(union node *);
8357 * Evaluate a parse tree. The value is left in the global variable
8361 evaltree(union node *n, int flags)
8363 struct jmploc *volatile savehandler = exception_handler;
8364 struct jmploc jmploc;
8366 void (*evalfn)(union node *, int);
8370 SAVE_INT(int_level);
8373 TRACE(("evaltree(NULL) called\n"));
8376 TRACE(("evaltree(%p: %d, %d) called\n", n, n->type, flags));
8378 exception_handler = &jmploc;
8380 int err = setjmp(jmploc.loc);
8382 /* if it was a signal, check for trap handlers */
8383 if (exception_type == EXSIG) {
8384 TRACE(("exception %d (EXSIG) in evaltree, err=%d\n",
8385 exception_type, err));
8388 /* continue on the way out */
8389 TRACE(("exception %d in evaltree, propagating err=%d\n",
8390 exception_type, err));
8391 exception_handler = savehandler;
8392 longjmp(exception_handler->loc, err);
8399 out1fmt("Node type = %d\n", n->type);
8404 evaltree(n->nnot.com, EV_TESTED);
8405 status = !exitstatus;
8408 expredir(n->nredir.redirect);
8409 status = redirectsafe(n->nredir.redirect, REDIR_PUSH);
8411 evaltree(n->nredir.n, flags & EV_TESTED);
8412 status = exitstatus;
8414 popredir(/*drop:*/ 0, /*restore:*/ 0 /* not sure */);
8417 evalfn = evalcommand;
8419 if (eflag && !(flags & EV_TESTED))
8431 evalfn = evalsubshell;
8444 #error NAND + 1 != NOR
8446 #if NOR + 1 != NSEMI
8447 #error NOR + 1 != NSEMI
8449 unsigned is_or = n->type - NAND;
8452 (flags | ((is_or >> 1) - 1)) & EV_TESTED
8454 if (!exitstatus == is_or)
8467 evaltree(n->nif.test, EV_TESTED);
8470 if (exitstatus == 0) {
8474 if (n->nif.elsepart) {
8475 n = n->nif.elsepart;
8480 defun(n->narg.text, n->narg.next);
8484 exitstatus = status;
8489 exception_handler = savehandler;
8492 /* Order of checks below is important:
8493 * signal handlers trigger before exit caused by "set -e".
8495 if (pending_sig && dotrap())
8497 if (checkexit & exitstatus)
8498 evalskip |= SKIPEVAL;
8500 if (flags & EV_EXIT) {
8502 raise_exception(EXEXIT);
8505 RESTORE_INT(int_level);
8506 TRACE(("leaving evaltree (no interrupts)\n"));
8509 #if !defined(__alpha__) || (defined(__GNUC__) && __GNUC__ >= 3)
8512 void evaltreenr(union node *, int) __attribute__ ((alias("evaltree"),__noreturn__));
8515 evalloop(union node *n, int flags)
8525 evaltree(n->nbinary.ch1, EV_TESTED);
8528 if (evalskip == SKIPCONT && --skipcount <= 0) {
8532 if (evalskip == SKIPBREAK && --skipcount <= 0)
8537 if (n->type != NWHILE)
8541 evaltree(n->nbinary.ch2, flags);
8542 status = exitstatus;
8547 exitstatus = status;
8551 evalfor(union node *n, int flags)
8553 struct arglist arglist;
8556 struct stackmark smark;
8558 setstackmark(&smark);
8559 arglist.list = NULL;
8560 arglist.lastp = &arglist.list;
8561 for (argp = n->nfor.args; argp; argp = argp->narg.next) {
8562 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE | EXP_RECORD);
8567 *arglist.lastp = NULL;
8572 for (sp = arglist.list; sp; sp = sp->next) {
8573 setvar(n->nfor.var, sp->text, 0);
8574 evaltree(n->nfor.body, flags);
8576 if (evalskip == SKIPCONT && --skipcount <= 0) {
8580 if (evalskip == SKIPBREAK && --skipcount <= 0)
8587 popstackmark(&smark);
8591 evalcase(union node *n, int flags)
8595 struct arglist arglist;
8596 struct stackmark smark;
8598 setstackmark(&smark);
8599 arglist.list = NULL;
8600 arglist.lastp = &arglist.list;
8601 expandarg(n->ncase.expr, &arglist, EXP_TILDE);
8603 for (cp = n->ncase.cases; cp && evalskip == 0; cp = cp->nclist.next) {
8604 for (patp = cp->nclist.pattern; patp; patp = patp->narg.next) {
8605 if (casematch(patp, arglist.list->text)) {
8606 if (evalskip == 0) {
8607 evaltree(cp->nclist.body, flags);
8614 popstackmark(&smark);
8618 * Kick off a subshell to evaluate a tree.
8621 evalsubshell(union node *n, int flags)
8624 int backgnd = (n->type == NBACKGND);
8627 expredir(n->nredir.redirect);
8628 if (!backgnd && (flags & EV_EXIT) && !may_have_traps)
8631 jp = makejob(/*n,*/ 1);
8632 if (forkshell(jp, n, backgnd) == 0) {
8637 flags &= ~EV_TESTED;
8639 redirect(n->nredir.redirect, 0);
8640 evaltreenr(n->nredir.n, flags);
8645 status = waitforjob(jp);
8646 exitstatus = status;
8651 * Compute the names of the files in a redirection list.
8653 static void fixredir(union node *, const char *, int);
8655 expredir(union node *n)
8659 for (redir = n; redir; redir = redir->nfile.next) {
8663 fn.lastp = &fn.list;
8664 switch (redir->type) {
8668 #if ENABLE_ASH_BASH_COMPAT
8673 expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR);
8674 TRACE(("expredir expanded to '%s'\n", fn.list->text));
8675 #if ENABLE_ASH_BASH_COMPAT
8678 redir->nfile.expfname = fn.list->text;
8681 case NTOFD: /* >& */
8682 if (redir->ndup.vname) {
8683 expandarg(redir->ndup.vname, &fn, EXP_FULL | EXP_TILDE);
8684 if (fn.list == NULL)
8685 ash_msg_and_raise_error("redir error");
8686 #if ENABLE_ASH_BASH_COMPAT
8687 //FIXME: we used expandarg with different args!
8688 if (!isdigit_str9(fn.list->text)) {
8689 /* >&file, not >&fd */
8690 if (redir->nfile.fd != 1) /* 123>&file - BAD */
8691 ash_msg_and_raise_error("redir error");
8693 goto store_expfname;
8696 fixredir(redir, fn.list->text, 1);
8704 * Evaluate a pipeline. All the processes in the pipeline are children
8705 * of the process creating the pipeline. (This differs from some versions
8706 * of the shell, which make the last process in a pipeline the parent
8710 evalpipe(union node *n, int flags)
8713 struct nodelist *lp;
8718 TRACE(("evalpipe(0x%lx) called\n", (long)n));
8720 for (lp = n->npipe.cmdlist; lp; lp = lp->next)
8724 jp = makejob(/*n,*/ pipelen);
8726 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
8730 if (pipe(pip) < 0) {
8732 ash_msg_and_raise_error("pipe call failed");
8735 if (forkshell(jp, lp->n, n->npipe.pipe_backgnd) == 0) {
8748 evaltreenr(lp->n, flags);
8754 /* Don't want to trigger debugging */
8758 if (n->npipe.pipe_backgnd == 0) {
8759 exitstatus = waitforjob(jp);
8760 TRACE(("evalpipe: job done exit status %d\n", exitstatus));
8766 * Controls whether the shell is interactive or not.
8769 setinteractive(int on)
8771 static smallint is_interactive;
8773 if (++on == is_interactive)
8775 is_interactive = on;
8779 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
8780 if (is_interactive > 1) {
8781 /* Looks like they want an interactive shell */
8782 static smallint did_banner;
8785 /* note: ash and hush share this string */
8786 out1fmt("\n\n%s %s\n"
8787 "Enter 'help' for a list of built-in commands."
8790 "built-in shell (ash)"
8804 setinteractive(iflag);
8806 #if ENABLE_FEATURE_EDITING_VI
8808 line_input_state->flags |= VI_MODE;
8810 line_input_state->flags &= ~VI_MODE;
8812 viflag = 0; /* forcibly keep the option off */
8816 static struct localvar *localvars;
8819 * Called after a function returns.
8820 * Interrupts must be off.
8825 struct localvar *lvp;
8828 while ((lvp = localvars) != NULL) {
8829 localvars = lvp->next;
8831 TRACE(("poplocalvar %s\n", vp ? vp->var_text : "-"));
8832 if (vp == NULL) { /* $- saved */
8833 memcpy(optlist, lvp->text, sizeof(optlist));
8834 free((char*)lvp->text);
8836 } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) {
8837 unsetvar(vp->var_text);
8840 vp->var_func(var_end(lvp->text));
8841 if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
8842 free((char*)vp->var_text);
8843 vp->flags = lvp->flags;
8844 vp->var_text = lvp->text;
8851 evalfun(struct funcnode *func, int argc, char **argv, int flags)
8853 volatile struct shparam saveparam;
8854 struct localvar *volatile savelocalvars;
8855 struct jmploc *volatile savehandler;
8856 struct jmploc jmploc;
8859 saveparam = shellparam;
8860 savelocalvars = localvars;
8861 e = setjmp(jmploc.loc);
8866 savehandler = exception_handler;
8867 exception_handler = &jmploc;
8869 shellparam.malloced = 0;
8873 shellparam.nparam = argc - 1;
8874 shellparam.p = argv + 1;
8875 #if ENABLE_ASH_GETOPTS
8876 shellparam.optind = 1;
8877 shellparam.optoff = -1;
8879 evaltree(&func->n, flags & EV_TESTED);
8885 localvars = savelocalvars;
8886 freeparam(&shellparam);
8887 shellparam = saveparam;
8888 exception_handler = savehandler;
8890 evalskip &= ~SKIPFUNC;
8894 #if ENABLE_ASH_CMDCMD
8896 parse_command_args(char **argv, const char **path)
8909 if (c == '-' && !*cp) {
8916 *path = bb_default_path;
8919 /* run 'typecmd' for other options */
8930 * Make a variable a local variable. When a variable is made local, it's
8931 * value and flags are saved in a localvar structure. The saved values
8932 * will be restored when the shell function returns. We handle the name
8933 * "-" as a special case.
8938 struct localvar *lvp;
8943 lvp = ckzalloc(sizeof(struct localvar));
8944 if (LONE_DASH(name)) {
8946 p = ckmalloc(sizeof(optlist));
8947 lvp->text = memcpy(p, optlist, sizeof(optlist));
8952 vpp = hashvar(name);
8953 vp = *findvar(vpp, name);
8954 eq = strchr(name, '=');
8957 setvareq(name, VSTRFIXED);
8959 setvar(name, NULL, VSTRFIXED);
8960 vp = *vpp; /* the new variable */
8961 lvp->flags = VUNSET;
8963 lvp->text = vp->var_text;
8964 lvp->flags = vp->flags;
8965 vp->flags |= VSTRFIXED|VTEXTFIXED;
8971 lvp->next = localvars;
8977 * The "local" command.
8979 static int FAST_FUNC
8980 localcmd(int argc UNUSED_PARAM, char **argv)
8985 while ((name = *argv++) != NULL) {
8991 static int FAST_FUNC
8992 falsecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
8997 static int FAST_FUNC
8998 truecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
9003 static int FAST_FUNC
9004 execcmd(int argc UNUSED_PARAM, char **argv)
9007 iflag = 0; /* exit on error */
9010 shellexec(argv + 1, pathval(), 0);
9016 * The return command.
9018 static int FAST_FUNC
9019 returncmd(int argc UNUSED_PARAM, char **argv)
9022 * If called outside a function, do what ksh does;
9023 * skip the rest of the file.
9025 evalskip = funcnest ? SKIPFUNC : SKIPFILE;
9026 return argv[1] ? number(argv[1]) : exitstatus;
9029 /* Forward declarations for builtintab[] */
9030 static int breakcmd(int, char **) FAST_FUNC;
9031 static int dotcmd(int, char **) FAST_FUNC;
9032 static int evalcmd(int, char **) FAST_FUNC;
9033 static int exitcmd(int, char **) FAST_FUNC;
9034 static int exportcmd(int, char **) FAST_FUNC;
9035 #if ENABLE_ASH_GETOPTS
9036 static int getoptscmd(int, char **) FAST_FUNC;
9038 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
9039 static int helpcmd(int, char **) FAST_FUNC;
9041 #if ENABLE_SH_MATH_SUPPORT
9042 static int letcmd(int, char **) FAST_FUNC;
9044 static int readcmd(int, char **) FAST_FUNC;
9045 static int setcmd(int, char **) FAST_FUNC;
9046 static int shiftcmd(int, char **) FAST_FUNC;
9047 static int timescmd(int, char **) FAST_FUNC;
9048 static int trapcmd(int, char **) FAST_FUNC;
9049 static int umaskcmd(int, char **) FAST_FUNC;
9050 static int unsetcmd(int, char **) FAST_FUNC;
9051 static int ulimitcmd(int, char **) FAST_FUNC;
9053 #define BUILTIN_NOSPEC "0"
9054 #define BUILTIN_SPECIAL "1"
9055 #define BUILTIN_REGULAR "2"
9056 #define BUILTIN_SPEC_REG "3"
9057 #define BUILTIN_ASSIGN "4"
9058 #define BUILTIN_SPEC_ASSG "5"
9059 #define BUILTIN_REG_ASSG "6"
9060 #define BUILTIN_SPEC_REG_ASSG "7"
9062 /* Stubs for calling non-FAST_FUNC's */
9063 #if ENABLE_ASH_BUILTIN_ECHO
9064 static int FAST_FUNC echocmd(int argc, char **argv) { return echo_main(argc, argv); }
9066 #if ENABLE_ASH_BUILTIN_PRINTF
9067 static int FAST_FUNC printfcmd(int argc, char **argv) { return printf_main(argc, argv); }
9069 #if ENABLE_ASH_BUILTIN_TEST
9070 static int FAST_FUNC testcmd(int argc, char **argv) { return test_main(argc, argv); }
9073 /* Keep these in proper order since it is searched via bsearch() */
9074 static const struct builtincmd builtintab[] = {
9075 { BUILTIN_SPEC_REG "." , dotcmd },
9076 { BUILTIN_SPEC_REG ":" , truecmd },
9077 #if ENABLE_ASH_BUILTIN_TEST
9078 { BUILTIN_REGULAR "[" , testcmd },
9079 #if ENABLE_ASH_BASH_COMPAT
9080 { BUILTIN_REGULAR "[[" , testcmd },
9083 #if ENABLE_ASH_ALIAS
9084 { BUILTIN_REG_ASSG "alias" , aliascmd },
9087 { BUILTIN_REGULAR "bg" , fg_bgcmd },
9089 { BUILTIN_SPEC_REG "break" , breakcmd },
9090 { BUILTIN_REGULAR "cd" , cdcmd },
9091 { BUILTIN_NOSPEC "chdir" , cdcmd },
9092 #if ENABLE_ASH_CMDCMD
9093 { BUILTIN_REGULAR "command" , commandcmd },
9095 { BUILTIN_SPEC_REG "continue", breakcmd },
9096 #if ENABLE_ASH_BUILTIN_ECHO
9097 { BUILTIN_REGULAR "echo" , echocmd },
9099 { BUILTIN_SPEC_REG "eval" , evalcmd },
9100 { BUILTIN_SPEC_REG "exec" , execcmd },
9101 { BUILTIN_SPEC_REG "exit" , exitcmd },
9102 { BUILTIN_SPEC_REG_ASSG "export" , exportcmd },
9103 { BUILTIN_REGULAR "false" , falsecmd },
9105 { BUILTIN_REGULAR "fg" , fg_bgcmd },
9107 #if ENABLE_ASH_GETOPTS
9108 { BUILTIN_REGULAR "getopts" , getoptscmd },
9110 { BUILTIN_NOSPEC "hash" , hashcmd },
9111 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
9112 { BUILTIN_NOSPEC "help" , helpcmd },
9115 { BUILTIN_REGULAR "jobs" , jobscmd },
9116 { BUILTIN_REGULAR "kill" , killcmd },
9118 #if ENABLE_SH_MATH_SUPPORT
9119 { BUILTIN_NOSPEC "let" , letcmd },
9121 { BUILTIN_ASSIGN "local" , localcmd },
9122 #if ENABLE_ASH_BUILTIN_PRINTF
9123 { BUILTIN_REGULAR "printf" , printfcmd },
9125 { BUILTIN_NOSPEC "pwd" , pwdcmd },
9126 { BUILTIN_REGULAR "read" , readcmd },
9127 { BUILTIN_SPEC_REG_ASSG "readonly", exportcmd },
9128 { BUILTIN_SPEC_REG "return" , returncmd },
9129 { BUILTIN_SPEC_REG "set" , setcmd },
9130 { BUILTIN_SPEC_REG "shift" , shiftcmd },
9131 #if ENABLE_ASH_BASH_COMPAT
9132 { BUILTIN_SPEC_REG "source" , dotcmd },
9134 #if ENABLE_ASH_BUILTIN_TEST
9135 { BUILTIN_REGULAR "test" , testcmd },
9137 { BUILTIN_SPEC_REG "times" , timescmd },
9138 { BUILTIN_SPEC_REG "trap" , trapcmd },
9139 { BUILTIN_REGULAR "true" , truecmd },
9140 { BUILTIN_NOSPEC "type" , typecmd },
9141 { BUILTIN_NOSPEC "ulimit" , ulimitcmd },
9142 { BUILTIN_REGULAR "umask" , umaskcmd },
9143 #if ENABLE_ASH_ALIAS
9144 { BUILTIN_REGULAR "unalias" , unaliascmd },
9146 { BUILTIN_SPEC_REG "unset" , unsetcmd },
9147 { BUILTIN_REGULAR "wait" , waitcmd },
9150 /* Should match the above table! */
9151 #define COMMANDCMD (builtintab + \
9153 1 * ENABLE_ASH_BUILTIN_TEST + \
9154 1 * ENABLE_ASH_BUILTIN_TEST * ENABLE_ASH_BASH_COMPAT + \
9155 1 * ENABLE_ASH_ALIAS + \
9156 1 * ENABLE_ASH_JOB_CONTROL + \
9158 #define EXECCMD (builtintab + \
9160 1 * ENABLE_ASH_BUILTIN_TEST + \
9161 1 * ENABLE_ASH_BUILTIN_TEST * ENABLE_ASH_BASH_COMPAT + \
9162 1 * ENABLE_ASH_ALIAS + \
9163 1 * ENABLE_ASH_JOB_CONTROL + \
9165 1 * ENABLE_ASH_CMDCMD + \
9167 ENABLE_ASH_BUILTIN_ECHO + \
9171 * Search the table of builtin commands.
9173 static struct builtincmd *
9174 find_builtin(const char *name)
9176 struct builtincmd *bp;
9179 name, builtintab, ARRAY_SIZE(builtintab), sizeof(builtintab[0]),
9186 * Execute a simple command.
9189 isassignment(const char *p)
9191 const char *q = endofname(p);
9196 static int FAST_FUNC
9197 bltincmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
9199 /* Preserve exitstatus of a previous possible redirection
9200 * as POSIX mandates */
9201 return back_exitstatus;
9204 evalcommand(union node *cmd, int flags)
9206 static const struct builtincmd null_bltin = {
9207 "\0\0", bltincmd /* why three NULs? */
9209 struct stackmark smark;
9211 struct arglist arglist;
9212 struct arglist varlist;
9215 const struct strlist *sp;
9216 struct cmdentry cmdentry;
9223 struct builtincmd *bcmd;
9224 smallint cmd_is_exec;
9225 smallint pseudovarflag = 0;
9227 /* First expand the arguments. */
9228 TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags));
9229 setstackmark(&smark);
9230 back_exitstatus = 0;
9232 cmdentry.cmdtype = CMDBUILTIN;
9233 cmdentry.u.cmd = &null_bltin;
9234 varlist.lastp = &varlist.list;
9235 *varlist.lastp = NULL;
9236 arglist.lastp = &arglist.list;
9237 *arglist.lastp = NULL;
9240 if (cmd->ncmd.args) {
9241 bcmd = find_builtin(cmd->ncmd.args->narg.text);
9242 pseudovarflag = bcmd && IS_BUILTIN_ASSIGN(bcmd);
9245 for (argp = cmd->ncmd.args; argp; argp = argp->narg.next) {
9246 struct strlist **spp;
9248 spp = arglist.lastp;
9249 if (pseudovarflag && isassignment(argp->narg.text))
9250 expandarg(argp, &arglist, EXP_VARTILDE);
9252 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
9254 for (sp = *spp; sp; sp = sp->next)
9258 argv = nargv = stalloc(sizeof(char *) * (argc + 1));
9259 for (sp = arglist.list; sp; sp = sp->next) {
9260 TRACE(("evalcommand arg: %s\n", sp->text));
9261 *nargv++ = sp->text;
9266 if (iflag && funcnest == 0 && argc > 0)
9267 lastarg = nargv[-1];
9270 expredir(cmd->ncmd.redirect);
9271 status = redirectsafe(cmd->ncmd.redirect, REDIR_PUSH | REDIR_SAVEFD2);
9273 path = vpath.var_text;
9274 for (argp = cmd->ncmd.assign; argp; argp = argp->narg.next) {
9275 struct strlist **spp;
9278 spp = varlist.lastp;
9279 expandarg(argp, &varlist, EXP_VARTILDE);
9282 * Modify the command lookup path, if a PATH= assignment
9286 if (varcmp(p, path) == 0)
9290 /* Print the command if xflag is set. */
9293 const char *p = " %s" + 1;
9295 fdprintf(preverrout_fd, p, expandstr(ps4val()));
9297 for (n = 0; n < 2; n++) {
9299 fdprintf(preverrout_fd, p, sp->text);
9305 safe_write(preverrout_fd, "\n", 1);
9311 /* Now locate the command. */
9313 const char *oldpath;
9314 int cmd_flag = DO_ERR;
9319 find_command(argv[0], &cmdentry, cmd_flag, path);
9320 if (cmdentry.cmdtype == CMDUNKNOWN) {
9321 flush_stdout_stderr();
9326 /* implement bltin and command here */
9327 if (cmdentry.cmdtype != CMDBUILTIN)
9330 spclbltin = IS_BUILTIN_SPECIAL(cmdentry.u.cmd);
9331 if (cmdentry.u.cmd == EXECCMD)
9333 #if ENABLE_ASH_CMDCMD
9334 if (cmdentry.u.cmd == COMMANDCMD) {
9336 nargv = parse_command_args(argv, &path);
9339 argc -= nargv - argv;
9341 cmd_flag |= DO_NOFUNC;
9349 /* We have a redirection error. */
9351 raise_exception(EXERROR);
9353 exitstatus = status;
9357 /* Execute the command. */
9358 switch (cmdentry.cmdtype) {
9361 #if ENABLE_FEATURE_SH_NOFORK
9362 /* (1) BUG: if variables are set, we need to fork, or save/restore them
9363 * around run_nofork_applet() call.
9364 * (2) Should this check also be done in forkshell()?
9365 * (perhaps it should, so that "VAR=VAL nofork" at least avoids exec...)
9367 /* find_command() encodes applet_no as (-2 - applet_no) */
9368 int applet_no = (- cmdentry.u.index - 2);
9369 if (applet_no >= 0 && APPLET_IS_NOFORK(applet_no)) {
9370 listsetvar(varlist.list, VEXPORT|VSTACK);
9371 /* run <applet>_main() */
9372 exitstatus = run_nofork_applet(applet_no, argv);
9376 /* Can we avoid forking off? For example, very last command
9377 * in a script or a subshell does not need forking,
9378 * we can just exec it.
9380 if (!(flags & EV_EXIT) || may_have_traps) {
9381 /* No, forking off a child is necessary */
9383 jp = makejob(/*cmd,*/ 1);
9384 if (forkshell(jp, cmd, FORK_FG) != 0) {
9386 exitstatus = waitforjob(jp);
9388 TRACE(("forked child exited with %d\n", exitstatus));
9393 /* fall through to exec'ing external program */
9395 listsetvar(varlist.list, VEXPORT|VSTACK);
9396 shellexec(argv, path, cmdentry.u.index);
9400 cmdenviron = varlist.list;
9402 struct strlist *list = cmdenviron;
9404 if (spclbltin > 0 || argc == 0) {
9406 if (cmd_is_exec && argc > 1)
9409 listsetvar(list, i);
9411 /* Tight loop with builtins only:
9412 * "while kill -0 $child; do true; done"
9413 * will never exit even if $child died, unless we do this
9414 * to reap the zombie and make kill detect that it's gone: */
9415 dowait(DOWAIT_NONBLOCK, NULL);
9417 if (evalbltin(cmdentry.u.cmd, argc, argv)) {
9419 int i = exception_type;
9424 exit_status = 128 + SIGINT;
9426 exit_status = 128 + pending_sig;
9427 exitstatus = exit_status;
9428 if (i == EXINT || spclbltin > 0) {
9430 longjmp(exception_handler->loc, 1);
9437 listsetvar(varlist.list, 0);
9438 /* See above for the rationale */
9439 dowait(DOWAIT_NONBLOCK, NULL);
9440 if (evalfun(cmdentry.u.func, argc, argv, flags))
9447 popredir(/*drop:*/ cmd_is_exec, /*restore:*/ cmd_is_exec);
9449 /* dsl: I think this is intended to be used to support
9450 * '_' in 'vi' command mode during line editing...
9451 * However I implemented that within libedit itself.
9453 setvar("_", lastarg, 0);
9455 popstackmark(&smark);
9459 evalbltin(const struct builtincmd *cmd, int argc, char **argv)
9461 char *volatile savecmdname;
9462 struct jmploc *volatile savehandler;
9463 struct jmploc jmploc;
9466 savecmdname = commandname;
9467 i = setjmp(jmploc.loc);
9470 savehandler = exception_handler;
9471 exception_handler = &jmploc;
9472 commandname = argv[0];
9474 optptr = NULL; /* initialize nextopt */
9475 exitstatus = (*cmd->builtin)(argc, argv);
9476 flush_stdout_stderr();
9478 exitstatus |= ferror(stdout);
9480 commandname = savecmdname;
9481 exception_handler = savehandler;
9487 goodname(const char *p)
9489 return endofname(p)[0] == '\0';
9494 * Search for a command. This is called before we fork so that the
9495 * location of the command will be available in the parent as well as
9496 * the child. The check for "goodname" is an overly conservative
9497 * check that the name will not be subject to expansion.
9500 prehash(union node *n)
9502 struct cmdentry entry;
9504 if (n->type == NCMD && n->ncmd.args && goodname(n->ncmd.args->narg.text))
9505 find_command(n->ncmd.args->narg.text, &entry, 0, pathval());
9509 /* ============ Builtin commands
9511 * Builtin commands whose functions are closely tied to evaluation
9512 * are implemented here.
9516 * Handle break and continue commands. Break, continue, and return are
9517 * all handled by setting the evalskip flag. The evaluation routines
9518 * above all check this flag, and if it is set they start skipping
9519 * commands rather than executing them. The variable skipcount is
9520 * the number of loops to break/continue, or the number of function
9521 * levels to return. (The latter is always 1.) It should probably
9522 * be an error to break out of more loops than exist, but it isn't
9523 * in the standard shell so we don't make it one here.
9525 static int FAST_FUNC
9526 breakcmd(int argc UNUSED_PARAM, char **argv)
9528 int n = argv[1] ? number(argv[1]) : 1;
9531 ash_msg_and_raise_error(msg_illnum, argv[1]);
9535 evalskip = (**argv == 'c') ? SKIPCONT : SKIPBREAK;
9542 /* ============ input.c
9544 * This implements the input routines used by the parser.
9548 INPUT_PUSH_FILE = 1,
9549 INPUT_NOFILE_OK = 2,
9552 static smallint checkkwd;
9553 /* values of checkkwd variable */
9554 #define CHKALIAS 0x1
9559 * Push a string back onto the input at this current parsefile level.
9560 * We handle aliases this way.
9562 #if !ENABLE_ASH_ALIAS
9563 #define pushstring(s, ap) pushstring(s)
9566 pushstring(char *s, struct alias *ap)
9573 if (g_parsefile->strpush) {
9574 sp = ckzalloc(sizeof(*sp));
9575 sp->prev = g_parsefile->strpush;
9577 sp = &(g_parsefile->basestrpush);
9579 g_parsefile->strpush = sp;
9580 sp->prev_string = g_parsefile->next_to_pgetc;
9581 sp->prev_left_in_line = g_parsefile->left_in_line;
9582 #if ENABLE_ASH_ALIAS
9585 ap->flag |= ALIASINUSE;
9589 g_parsefile->next_to_pgetc = s;
9590 g_parsefile->left_in_line = len;
9597 struct strpush *sp = g_parsefile->strpush;
9600 #if ENABLE_ASH_ALIAS
9602 if (g_parsefile->next_to_pgetc[-1] == ' '
9603 || g_parsefile->next_to_pgetc[-1] == '\t'
9605 checkkwd |= CHKALIAS;
9607 if (sp->string != sp->ap->val) {
9610 sp->ap->flag &= ~ALIASINUSE;
9611 if (sp->ap->flag & ALIASDEAD) {
9612 unalias(sp->ap->name);
9616 g_parsefile->next_to_pgetc = sp->prev_string;
9617 g_parsefile->left_in_line = sp->prev_left_in_line;
9618 g_parsefile->strpush = sp->prev;
9619 if (sp != &(g_parsefile->basestrpush))
9624 //FIXME: BASH_COMPAT with "...&" does TWO pungetc():
9625 //it peeks whether it is &>, and then pushes back both chars.
9626 //This function needs to save last *next_to_pgetc to buf[0]
9627 //to make two pungetc() reliable. Currently,
9628 // pgetc (out of buf: does preadfd), pgetc, pungetc, pungetc won't work...
9633 char *buf = g_parsefile->buf;
9635 g_parsefile->next_to_pgetc = buf;
9636 #if ENABLE_FEATURE_EDITING
9638 if (!iflag || g_parsefile->pf_fd != STDIN_FILENO)
9639 nr = nonblock_immune_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1, /*loop_on_EINTR:*/ 1);
9642 # if ENABLE_ASH_IDLE_TIMEOUT
9644 const char *tmout_var = lookupvar("TMOUT");
9646 timeout = atoi(tmout_var) * 1000;
9652 # if ENABLE_FEATURE_TAB_COMPLETION
9653 line_input_state->path_lookup = pathval();
9655 /* Unicode support should be activated even if LANG is set
9656 * _during_ shell execution, not only if it was set when
9657 * shell was started. Therefore, re-check LANG every time:
9659 reinit_unicode(lookupvar("LANG"));
9660 nr = read_line_input(line_input_state, cmdedit_prompt, buf, IBUFSIZ, timeout);
9662 /* Ctrl+C pressed */
9673 /* Ctrl+D pressed */
9676 # if ENABLE_ASH_IDLE_TIMEOUT
9677 else if (errno == EAGAIN && timeout > 0) {
9678 printf("\007timed out waiting for input: auto-logout\n");
9685 nr = nonblock_immune_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1, /*loop_on_EINTR:*/ 1);
9688 #if 0 /* disabled: nonblock_immune_read() handles this problem */
9690 if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
9691 int flags = fcntl(0, F_GETFL);
9692 if (flags >= 0 && (flags & O_NONBLOCK)) {
9693 flags &= ~O_NONBLOCK;
9694 if (fcntl(0, F_SETFL, flags) >= 0) {
9695 out2str("sh: turning off NDELAY mode\n");
9706 * Refill the input buffer and return the next input character:
9708 * 1) If a string was pushed back on the input, pop it;
9709 * 2) If an EOF was pushed back (g_parsefile->left_in_line < -BIGNUM)
9710 * or we are reading from a string so we can't refill the buffer,
9712 * 3) If there is more stuff in this buffer, use it else call read to fill it.
9713 * 4) Process input up to the next newline, deleting nul characters.
9715 //#define pgetc_debug(...) bb_error_msg(__VA_ARGS__)
9716 #define pgetc_debug(...) ((void)0)
9723 while (g_parsefile->strpush) {
9724 #if ENABLE_ASH_ALIAS
9725 if (g_parsefile->left_in_line == -1
9726 && g_parsefile->strpush->ap
9727 && g_parsefile->next_to_pgetc[-1] != ' '
9728 && g_parsefile->next_to_pgetc[-1] != '\t'
9730 pgetc_debug("preadbuffer PEOA");
9735 /* try "pgetc" now: */
9736 pgetc_debug("preadbuffer internal pgetc at %d:%p'%s'",
9737 g_parsefile->left_in_line,
9738 g_parsefile->next_to_pgetc,
9739 g_parsefile->next_to_pgetc);
9740 if (--g_parsefile->left_in_line >= 0)
9741 return (unsigned char)(*g_parsefile->next_to_pgetc++);
9743 /* on both branches above g_parsefile->left_in_line < 0.
9744 * "pgetc" needs refilling.
9747 /* -90 is our -BIGNUM. Below we use -99 to mark "EOF on read",
9748 * pungetc() may increment it a few times.
9749 * Assuming it won't increment it to less than -90.
9751 if (g_parsefile->left_in_line < -90 || g_parsefile->buf == NULL) {
9752 pgetc_debug("preadbuffer PEOF1");
9753 /* even in failure keep left_in_line and next_to_pgetc
9754 * in lock step, for correct multi-layer pungetc.
9755 * left_in_line was decremented before preadbuffer(),
9756 * must inc next_to_pgetc: */
9757 g_parsefile->next_to_pgetc++;
9761 more = g_parsefile->left_in_buffer;
9763 flush_stdout_stderr();
9767 /* don't try reading again */
9768 g_parsefile->left_in_line = -99;
9769 pgetc_debug("preadbuffer PEOF2");
9770 g_parsefile->next_to_pgetc++;
9775 /* Find out where's the end of line.
9776 * Set g_parsefile->left_in_line
9777 * and g_parsefile->left_in_buffer acordingly.
9778 * NUL chars are deleted.
9780 q = g_parsefile->next_to_pgetc;
9788 memmove(q, q + 1, more);
9792 g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1;
9798 g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1;
9799 if (g_parsefile->left_in_line < 0)
9804 g_parsefile->left_in_buffer = more;
9809 out2str(g_parsefile->next_to_pgetc);
9813 pgetc_debug("preadbuffer at %d:%p'%s'",
9814 g_parsefile->left_in_line,
9815 g_parsefile->next_to_pgetc,
9816 g_parsefile->next_to_pgetc);
9817 return (unsigned char)*g_parsefile->next_to_pgetc++;
9820 #define pgetc_as_macro() \
9821 (--g_parsefile->left_in_line >= 0 \
9822 ? (unsigned char)*g_parsefile->next_to_pgetc++ \
9829 pgetc_debug("pgetc_fast at %d:%p'%s'",
9830 g_parsefile->left_in_line,
9831 g_parsefile->next_to_pgetc,
9832 g_parsefile->next_to_pgetc);
9833 return pgetc_as_macro();
9836 #if ENABLE_ASH_OPTIMIZE_FOR_SIZE
9837 # define pgetc_fast() pgetc()
9839 # define pgetc_fast() pgetc_as_macro()
9842 #if ENABLE_ASH_ALIAS
9844 pgetc_without_PEOA(void)
9848 pgetc_debug("pgetc_fast at %d:%p'%s'",
9849 g_parsefile->left_in_line,
9850 g_parsefile->next_to_pgetc,
9851 g_parsefile->next_to_pgetc);
9853 } while (c == PEOA);
9857 # define pgetc_without_PEOA() pgetc()
9861 * Read a line from the script.
9864 pfgets(char *line, int len)
9870 while (--nleft > 0) {
9871 c = pgetc_without_PEOA();
9886 * Undo the last call to pgetc. Only one character may be pushed back.
9887 * PEOF may be pushed back.
9892 g_parsefile->left_in_line++;
9893 g_parsefile->next_to_pgetc--;
9894 pgetc_debug("pushed back to %d:%p'%s'",
9895 g_parsefile->left_in_line,
9896 g_parsefile->next_to_pgetc,
9897 g_parsefile->next_to_pgetc);
9901 * To handle the "." command, a stack of input files is used. Pushfile
9902 * adds a new entry to the stack and popfile restores the previous level.
9907 struct parsefile *pf;
9909 pf = ckzalloc(sizeof(*pf));
9910 pf->prev = g_parsefile;
9912 /*pf->strpush = NULL; - ckzalloc did it */
9913 /*pf->basestrpush.prev = NULL;*/
9920 struct parsefile *pf = g_parsefile;
9928 g_parsefile = pf->prev;
9934 * Return to top level.
9939 while (g_parsefile != &basepf)
9944 * Close the file(s) that the shell is reading commands from. Called
9945 * after a fork is done.
9951 if (g_parsefile->pf_fd > 0) {
9952 close(g_parsefile->pf_fd);
9953 g_parsefile->pf_fd = 0;
9958 * Like setinputfile, but takes an open file descriptor. Call this with
9962 setinputfd(int fd, int push)
9964 close_on_exec_on(fd);
9967 g_parsefile->buf = NULL;
9969 g_parsefile->pf_fd = fd;
9970 if (g_parsefile->buf == NULL)
9971 g_parsefile->buf = ckmalloc(IBUFSIZ);
9972 g_parsefile->left_in_buffer = 0;
9973 g_parsefile->left_in_line = 0;
9974 g_parsefile->linno = 1;
9978 * Set the input to take input from a file. If push is set, push the
9979 * old input onto the stack first.
9982 setinputfile(const char *fname, int flags)
9988 fd = open(fname, O_RDONLY);
9990 if (flags & INPUT_NOFILE_OK)
9992 ash_msg_and_raise_error("can't open '%s'", fname);
9995 fd2 = copyfd(fd, 10);
9998 ash_msg_and_raise_error("out of file descriptors");
10001 setinputfd(fd, flags & INPUT_PUSH_FILE);
10008 * Like setinputfile, but takes input from a string.
10011 setinputstring(char *string)
10015 g_parsefile->next_to_pgetc = string;
10016 g_parsefile->left_in_line = strlen(string);
10017 g_parsefile->buf = NULL;
10018 g_parsefile->linno = 1;
10023 /* ============ mail.c
10025 * Routines to check for mail.
10028 #if ENABLE_ASH_MAIL
10030 #define MAXMBOXES 10
10032 /* times of mailboxes */
10033 static time_t mailtime[MAXMBOXES];
10034 /* Set if MAIL or MAILPATH is changed. */
10035 static smallint mail_var_path_changed;
10038 * Print appropriate message(s) if mail has arrived.
10039 * If mail_var_path_changed is set,
10040 * then the value of MAIL has mail_var_path_changed,
10041 * so we just update the values.
10050 struct stackmark smark;
10053 setstackmark(&smark);
10054 mpath = mpathset() ? mpathval() : mailval();
10055 for (mtp = mailtime; mtp < mailtime + MAXMBOXES; mtp++) {
10056 p = path_advance(&mpath, nullstr);
10061 for (q = p; *q; q++)
10067 q[-1] = '\0'; /* delete trailing '/' */
10068 if (stat(p, &statb) < 0) {
10072 if (!mail_var_path_changed && statb.st_mtime != *mtp) {
10075 pathopt ? pathopt : "you have mail"
10078 *mtp = statb.st_mtime;
10080 mail_var_path_changed = 0;
10081 popstackmark(&smark);
10084 static void FAST_FUNC
10085 changemail(const char *val UNUSED_PARAM)
10087 mail_var_path_changed = 1;
10090 #endif /* ASH_MAIL */
10093 /* ============ ??? */
10096 * Set the shell parameters.
10099 setparam(char **argv)
10105 for (nparam = 0; argv[nparam]; nparam++)
10107 ap = newparam = ckmalloc((nparam + 1) * sizeof(*ap));
10109 *ap++ = ckstrdup(*argv++);
10112 freeparam(&shellparam);
10113 shellparam.malloced = 1;
10114 shellparam.nparam = nparam;
10115 shellparam.p = newparam;
10116 #if ENABLE_ASH_GETOPTS
10117 shellparam.optind = 1;
10118 shellparam.optoff = -1;
10123 * Process shell options. The global variable argptr contains a pointer
10124 * to the argument list; we advance it past the options.
10126 * SUSv3 section 2.8.1 "Consequences of Shell Errors" says:
10127 * For a non-interactive shell, an error condition encountered
10128 * by a special built-in ... shall cause the shell to write a diagnostic message
10129 * to standard error and exit as shown in the following table:
10130 * Error Special Built-In
10132 * Utility syntax error (option or operand error) Shall exit
10134 * However, in bug 1142 (http://busybox.net/bugs/view.php?id=1142)
10135 * we see that bash does not do that (set "finishes" with error code 1 instead,
10136 * and shell continues), and people rely on this behavior!
10138 * set -o barfoo 2>/dev/null
10141 * Oh well. Let's mimic that.
10144 plus_minus_o(char *name, int val)
10149 for (i = 0; i < NOPTS; i++) {
10150 if (strcmp(name, optnames(i)) == 0) {
10155 ash_msg("illegal option %co %s", val ? '-' : '+', name);
10158 for (i = 0; i < NOPTS; i++) {
10160 out1fmt("%-16s%s\n", optnames(i), optlist[i] ? "on" : "off");
10162 out1fmt("set %co %s\n", optlist[i] ? '-' : '+', optnames(i));
10168 setoption(int flag, int val)
10172 for (i = 0; i < NOPTS; i++) {
10173 if (optletters(i) == flag) {
10178 ash_msg_and_raise_error("illegal option %c%c", val ? '-' : '+', flag);
10182 options(int cmdline)
10190 while ((p = *argptr) != NULL) {
10192 if (c != '-' && c != '+')
10195 val = 0; /* val = 0 if c == '+' */
10198 if (p[0] == '\0' || LONE_DASH(p)) {
10200 /* "-" means turn off -x and -v */
10203 /* "--" means reset params */
10204 else if (*argptr == NULL)
10207 break; /* "-" or "--" terminates options */
10210 /* first char was + or - */
10211 while ((c = *p++) != '\0') {
10212 /* bash 3.2 indeed handles -c CMD and +c CMD the same */
10213 if (c == 'c' && cmdline) {
10214 minusc = p; /* command is after shell args */
10215 } else if (c == 'o') {
10216 if (plus_minus_o(*argptr, val)) {
10217 /* it already printed err message */
10218 return 1; /* error */
10222 } else if (cmdline && (c == 'l')) { /* -l or +l == --login */
10224 /* bash does not accept +-login, we also won't */
10225 } else if (cmdline && val && (c == '-')) { /* long options */
10226 if (strcmp(p, "login") == 0)
10238 * The shift builtin command.
10240 static int FAST_FUNC
10241 shiftcmd(int argc UNUSED_PARAM, char **argv)
10248 n = number(argv[1]);
10249 if (n > shellparam.nparam)
10250 n = 0; /* bash compat, was = shellparam.nparam; */
10252 shellparam.nparam -= n;
10253 for (ap1 = shellparam.p; --n >= 0; ap1++) {
10254 if (shellparam.malloced)
10257 ap2 = shellparam.p;
10258 while ((*ap2++ = *ap1++) != NULL)
10260 #if ENABLE_ASH_GETOPTS
10261 shellparam.optind = 1;
10262 shellparam.optoff = -1;
10269 * POSIX requires that 'set' (but not export or readonly) output the
10270 * variables in lexicographic order - by the locale's collating order (sigh).
10271 * Maybe we could keep them in an ordered balanced binary tree
10272 * instead of hashed lists.
10273 * For now just roll 'em through qsort for printing...
10276 showvars(const char *sep_prefix, int on, int off)
10279 char **ep, **epend;
10281 ep = listvars(on, off, &epend);
10282 qsort(ep, epend - ep, sizeof(char *), vpcmp);
10284 sep = *sep_prefix ? " " : sep_prefix;
10286 for (; ep < epend; ep++) {
10290 p = strchrnul(*ep, '=');
10293 q = single_quote(++p);
10294 out1fmt("%s%s%.*s%s\n", sep_prefix, sep, (int)(p - *ep), *ep, q);
10300 * The set command builtin.
10302 static int FAST_FUNC
10303 setcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
10308 return showvars(nullstr, 0, VUNSET);
10311 retval = options(/*cmdline:*/ 0);
10312 if (retval == 0) { /* if no parse error... */
10314 if (*argptr != NULL) {
10322 #if ENABLE_ASH_RANDOM_SUPPORT
10323 static void FAST_FUNC
10324 change_random(const char *value)
10328 if (value == NULL) {
10329 /* "get", generate */
10330 t = next_random(&random_gen);
10331 /* set without recursion */
10332 setvar(vrandom.var_text, utoa(t), VNOFUNC);
10333 vrandom.flags &= ~VNOFUNC;
10336 t = strtoul(value, NULL, 10);
10337 INIT_RANDOM_T(&random_gen, (t ? t : 1), t);
10342 #if ENABLE_ASH_GETOPTS
10344 getopts(char *optstr, char *optvar, char **optfirst, int *param_optind, int *optoff)
10353 if (*param_optind < 1)
10355 optnext = optfirst + *param_optind - 1;
10357 if (*param_optind <= 1 || *optoff < 0 || (int)strlen(optnext[-1]) < *optoff)
10360 p = optnext[-1] + *optoff;
10361 if (p == NULL || *p == '\0') {
10362 /* Current word is done, advance */
10364 if (p == NULL || *p != '-' || *++p == '\0') {
10371 if (LONE_DASH(p)) /* check for "--" */
10376 for (q = optstr; *q != c;) {
10378 if (optstr[0] == ':') {
10381 err |= setvarsafe("OPTARG", s, 0);
10383 fprintf(stderr, "Illegal option -%c\n", c);
10384 unsetvar("OPTARG");
10394 if (*p == '\0' && (p = *optnext) == NULL) {
10395 if (optstr[0] == ':') {
10398 err |= setvarsafe("OPTARG", s, 0);
10401 fprintf(stderr, "No arg for -%c option\n", c);
10402 unsetvar("OPTARG");
10410 err |= setvarsafe("OPTARG", p, 0);
10413 err |= setvarsafe("OPTARG", nullstr, 0);
10415 *optoff = p ? p - *(optnext - 1) : -1;
10416 *param_optind = optnext - optfirst + 1;
10417 fmtstr(s, sizeof(s), "%d", *param_optind);
10418 err |= setvarsafe("OPTIND", s, VNOFUNC);
10421 err |= setvarsafe(optvar, s, 0);
10425 flush_stdout_stderr();
10426 raise_exception(EXERROR);
10432 * The getopts builtin. Shellparam.optnext points to the next argument
10433 * to be processed. Shellparam.optptr points to the next character to
10434 * be processed in the current argument. If shellparam.optnext is NULL,
10435 * then it's the first time getopts has been called.
10437 static int FAST_FUNC
10438 getoptscmd(int argc, char **argv)
10443 ash_msg_and_raise_error("usage: getopts optstring var [arg]");
10445 optbase = shellparam.p;
10446 if (shellparam.optind > shellparam.nparam + 1) {
10447 shellparam.optind = 1;
10448 shellparam.optoff = -1;
10451 optbase = &argv[3];
10452 if (shellparam.optind > argc - 2) {
10453 shellparam.optind = 1;
10454 shellparam.optoff = -1;
10458 return getopts(argv[1], argv[2], optbase, &shellparam.optind,
10459 &shellparam.optoff);
10461 #endif /* ASH_GETOPTS */
10464 /* ============ Shell parser */
10467 struct heredoc *next; /* next here document in list */
10468 union node *here; /* redirection node */
10469 char *eofmark; /* string indicating end of input */
10470 smallint striptabs; /* if set, strip leading tabs */
10473 static smallint tokpushback; /* last token pushed back */
10474 static smallint parsebackquote; /* nonzero if we are inside backquotes */
10475 static smallint quoteflag; /* set if (part of) last token was quoted */
10476 static token_id_t lasttoken; /* last token read (integer id Txxx) */
10477 static struct heredoc *heredoclist; /* list of here documents to read */
10478 static char *wordtext; /* text of last word returned by readtoken */
10479 static struct nodelist *backquotelist;
10480 static union node *redirnode;
10481 static struct heredoc *heredoc;
10483 static const char *
10484 tokname(char *buf, int tok)
10487 return tokname_array[tok] + 1;
10488 sprintf(buf, "\"%s\"", tokname_array[tok] + 1);
10492 /* raise_error_unexpected_syntax:
10493 * Called when an unexpected token is read during the parse. The argument
10494 * is the token that is expected, or -1 if more than one type of token can
10495 * occur at this point.
10497 static void raise_error_unexpected_syntax(int) NORETURN;
10499 raise_error_unexpected_syntax(int token)
10505 l = sprintf(msg, "unexpected %s", tokname(buf, lasttoken));
10507 sprintf(msg + l, " (expecting %s)", tokname(buf, token));
10508 raise_error_syntax(msg);
10512 #define EOFMARKLEN 79
10514 /* parsing is heavily cross-recursive, need these forward decls */
10515 static union node *andor(void);
10516 static union node *pipeline(void);
10517 static union node *parse_command(void);
10518 static void parseheredoc(void);
10519 static char peektoken(void);
10520 static int readtoken(void);
10522 static union node *
10525 union node *n1, *n2, *n3;
10528 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10529 if (nlflag == 2 && peektoken())
10535 if (tok == TBACKGND) {
10536 if (n2->type == NPIPE) {
10537 n2->npipe.pipe_backgnd = 1;
10539 if (n2->type != NREDIR) {
10540 n3 = stzalloc(sizeof(struct nredir));
10542 /*n3->nredir.redirect = NULL; - stzalloc did it */
10545 n2->type = NBACKGND;
10551 n3 = stzalloc(sizeof(struct nbinary));
10553 n3->nbinary.ch1 = n1;
10554 n3->nbinary.ch2 = n2;
10570 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10578 pungetc(); /* push back EOF on input */
10582 raise_error_unexpected_syntax(-1);
10589 static union node *
10592 union node *n1, *n2, *n3;
10600 } else if (t == TOR) {
10606 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10608 n3 = stzalloc(sizeof(struct nbinary));
10610 n3->nbinary.ch1 = n1;
10611 n3->nbinary.ch2 = n2;
10616 static union node *
10619 union node *n1, *n2, *pipenode;
10620 struct nodelist *lp, *prev;
10624 TRACE(("pipeline: entered\n"));
10625 if (readtoken() == TNOT) {
10627 checkkwd = CHKKWD | CHKALIAS;
10630 n1 = parse_command();
10631 if (readtoken() == TPIPE) {
10632 pipenode = stzalloc(sizeof(struct npipe));
10633 pipenode->type = NPIPE;
10634 /*pipenode->npipe.pipe_backgnd = 0; - stzalloc did it */
10635 lp = stzalloc(sizeof(struct nodelist));
10636 pipenode->npipe.cmdlist = lp;
10640 lp = stzalloc(sizeof(struct nodelist));
10641 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10642 lp->n = parse_command();
10644 } while (readtoken() == TPIPE);
10650 n2 = stzalloc(sizeof(struct nnot));
10658 static union node *
10663 n = stzalloc(sizeof(struct narg));
10665 /*n->narg.next = NULL; - stzalloc did it */
10666 n->narg.text = wordtext;
10667 n->narg.backquote = backquotelist;
10672 fixredir(union node *n, const char *text, int err)
10676 TRACE(("Fix redir %s %d\n", text, err));
10678 n->ndup.vname = NULL;
10680 fd = bb_strtou(text, NULL, 10);
10681 if (!errno && fd >= 0)
10682 n->ndup.dupfd = fd;
10683 else if (LONE_DASH(text))
10684 n->ndup.dupfd = -1;
10687 raise_error_syntax("bad fd number");
10688 n->ndup.vname = makename();
10693 * Returns true if the text contains nothing to expand (no dollar signs
10697 noexpand(const char *text)
10701 while ((c = *text++) != '\0') {
10702 if (c == CTLQUOTEMARK)
10706 else if (SIT(c, BASESYNTAX) == CCTL)
10715 union node *n = redirnode;
10717 if (readtoken() != TWORD)
10718 raise_error_unexpected_syntax(-1);
10719 if (n->type == NHERE) {
10720 struct heredoc *here = heredoc;
10724 if (quoteflag == 0)
10726 TRACE(("Here document %d\n", n->type));
10727 if (!noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN)
10728 raise_error_syntax("illegal eof marker for << redirection");
10729 rmescapes(wordtext, 0);
10730 here->eofmark = wordtext;
10732 if (heredoclist == NULL)
10733 heredoclist = here;
10735 for (p = heredoclist; p->next; p = p->next)
10739 } else if (n->type == NTOFD || n->type == NFROMFD) {
10740 fixredir(n, wordtext, 0);
10742 n->nfile.fname = makename();
10746 static union node *
10749 union node *args, **app;
10750 union node *n = NULL;
10751 union node *vars, **vpp;
10752 union node **rpp, *redir;
10754 #if ENABLE_ASH_BASH_COMPAT
10755 smallint double_brackets_flag = 0;
10765 savecheckkwd = CHKALIAS;
10768 checkkwd = savecheckkwd;
10771 #if ENABLE_ASH_BASH_COMPAT
10772 case TAND: /* "&&" */
10773 case TOR: /* "||" */
10774 if (!double_brackets_flag) {
10778 wordtext = (char *) (t == TAND ? "-a" : "-o");
10781 n = stzalloc(sizeof(struct narg));
10783 /*n->narg.next = NULL; - stzalloc did it */
10784 n->narg.text = wordtext;
10785 #if ENABLE_ASH_BASH_COMPAT
10786 if (strcmp("[[", wordtext) == 0)
10787 double_brackets_flag = 1;
10788 else if (strcmp("]]", wordtext) == 0)
10789 double_brackets_flag = 0;
10791 n->narg.backquote = backquotelist;
10792 if (savecheckkwd && isassignment(wordtext)) {
10794 vpp = &n->narg.next;
10797 app = &n->narg.next;
10802 *rpp = n = redirnode;
10803 rpp = &n->nfile.next;
10804 parsefname(); /* read name of redirection file */
10807 if (args && app == &args->narg.next
10810 struct builtincmd *bcmd;
10813 /* We have a function */
10814 if (readtoken() != TRP)
10815 raise_error_unexpected_syntax(TRP);
10816 name = n->narg.text;
10817 if (!goodname(name)
10818 || ((bcmd = find_builtin(name)) && IS_BUILTIN_SPECIAL(bcmd))
10820 raise_error_syntax("bad function name");
10823 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10824 n->narg.next = parse_command();
10837 n = stzalloc(sizeof(struct ncmd));
10839 n->ncmd.args = args;
10840 n->ncmd.assign = vars;
10841 n->ncmd.redirect = redir;
10845 static union node *
10846 parse_command(void)
10848 union node *n1, *n2;
10849 union node *ap, **app;
10850 union node *cp, **cpp;
10851 union node *redir, **rpp;
10858 switch (readtoken()) {
10860 raise_error_unexpected_syntax(-1);
10863 n1 = stzalloc(sizeof(struct nif));
10865 n1->nif.test = list(0);
10866 if (readtoken() != TTHEN)
10867 raise_error_unexpected_syntax(TTHEN);
10868 n1->nif.ifpart = list(0);
10870 while (readtoken() == TELIF) {
10871 n2->nif.elsepart = stzalloc(sizeof(struct nif));
10872 n2 = n2->nif.elsepart;
10874 n2->nif.test = list(0);
10875 if (readtoken() != TTHEN)
10876 raise_error_unexpected_syntax(TTHEN);
10877 n2->nif.ifpart = list(0);
10879 if (lasttoken == TELSE)
10880 n2->nif.elsepart = list(0);
10882 n2->nif.elsepart = NULL;
10890 n1 = stzalloc(sizeof(struct nbinary));
10891 n1->type = (lasttoken == TWHILE) ? NWHILE : NUNTIL;
10892 n1->nbinary.ch1 = list(0);
10895 TRACE(("expecting DO got '%s' %s\n", tokname_array[got] + 1,
10896 got == TWORD ? wordtext : ""));
10897 raise_error_unexpected_syntax(TDO);
10899 n1->nbinary.ch2 = list(0);
10904 if (readtoken() != TWORD || quoteflag || !goodname(wordtext))
10905 raise_error_syntax("bad for loop variable");
10906 n1 = stzalloc(sizeof(struct nfor));
10908 n1->nfor.var = wordtext;
10909 checkkwd = CHKKWD | CHKALIAS;
10910 if (readtoken() == TIN) {
10912 while (readtoken() == TWORD) {
10913 n2 = stzalloc(sizeof(struct narg));
10915 /*n2->narg.next = NULL; - stzalloc did it */
10916 n2->narg.text = wordtext;
10917 n2->narg.backquote = backquotelist;
10919 app = &n2->narg.next;
10922 n1->nfor.args = ap;
10923 if (lasttoken != TNL && lasttoken != TSEMI)
10924 raise_error_unexpected_syntax(-1);
10926 n2 = stzalloc(sizeof(struct narg));
10928 /*n2->narg.next = NULL; - stzalloc did it */
10929 n2->narg.text = (char *)dolatstr;
10930 /*n2->narg.backquote = NULL;*/
10931 n1->nfor.args = n2;
10933 * Newline or semicolon here is optional (but note
10934 * that the original Bourne shell only allowed NL).
10936 if (lasttoken != TNL && lasttoken != TSEMI)
10939 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10940 if (readtoken() != TDO)
10941 raise_error_unexpected_syntax(TDO);
10942 n1->nfor.body = list(0);
10946 n1 = stzalloc(sizeof(struct ncase));
10948 if (readtoken() != TWORD)
10949 raise_error_unexpected_syntax(TWORD);
10950 n1->ncase.expr = n2 = stzalloc(sizeof(struct narg));
10952 /*n2->narg.next = NULL; - stzalloc did it */
10953 n2->narg.text = wordtext;
10954 n2->narg.backquote = backquotelist;
10956 checkkwd = CHKKWD | CHKALIAS;
10957 } while (readtoken() == TNL);
10958 if (lasttoken != TIN)
10959 raise_error_unexpected_syntax(TIN);
10960 cpp = &n1->ncase.cases;
10962 checkkwd = CHKNL | CHKKWD;
10964 while (t != TESAC) {
10965 if (lasttoken == TLP)
10967 *cpp = cp = stzalloc(sizeof(struct nclist));
10969 app = &cp->nclist.pattern;
10971 *app = ap = stzalloc(sizeof(struct narg));
10973 /*ap->narg.next = NULL; - stzalloc did it */
10974 ap->narg.text = wordtext;
10975 ap->narg.backquote = backquotelist;
10976 if (readtoken() != TPIPE)
10978 app = &ap->narg.next;
10981 //ap->narg.next = NULL;
10982 if (lasttoken != TRP)
10983 raise_error_unexpected_syntax(TRP);
10984 cp->nclist.body = list(2);
10986 cpp = &cp->nclist.next;
10988 checkkwd = CHKNL | CHKKWD;
10992 raise_error_unexpected_syntax(TENDCASE);
10999 n1 = stzalloc(sizeof(struct nredir));
11000 n1->type = NSUBSHELL;
11001 n1->nredir.n = list(0);
11002 /*n1->nredir.redirect = NULL; - stzalloc did it */
11012 return simplecmd();
11015 if (readtoken() != t)
11016 raise_error_unexpected_syntax(t);
11019 /* Now check for redirection which may follow command */
11020 checkkwd = CHKKWD | CHKALIAS;
11022 while (readtoken() == TREDIR) {
11023 *rpp = n2 = redirnode;
11024 rpp = &n2->nfile.next;
11030 if (n1->type != NSUBSHELL) {
11031 n2 = stzalloc(sizeof(struct nredir));
11036 n1->nredir.redirect = redir;
11041 #if ENABLE_ASH_BASH_COMPAT
11042 static int decode_dollar_squote(void)
11044 static const char C_escapes[] ALIGN1 = "nrbtfav""x\\01234567";
11050 p = strchr(C_escapes, c);
11055 if ((unsigned char)(c - '0') <= 7) { /* \ooo */
11059 } while ((unsigned char)(c - '0') <= 7 && --cnt);
11061 } else if (c == 'x') { /* \xHH */
11065 } while (isxdigit(c) && --cnt);
11067 if (cnt == 3) { /* \x but next char is "bad" */
11071 } else { /* simple seq like \\ or \t */
11076 c = bb_process_escape_sequence((void*)&p);
11077 } else { /* unrecognized "\z": print both chars unless ' or " */
11078 if (c != '\'' && c != '"') {
11080 c |= 0x100; /* "please encode \, then me" */
11088 * If eofmark is NULL, read a word or a redirection symbol. If eofmark
11089 * is not NULL, read a here document. In the latter case, eofmark is the
11090 * word which marks the end of the document and striptabs is true if
11091 * leading tabs should be stripped from the document. The argument c
11092 * is the first character of the input token or document.
11094 * Because C does not have internal subroutines, I have simulated them
11095 * using goto's to implement the subroutine linkage. The following macros
11096 * will run code that appears at the end of readtoken1.
11098 #define CHECKEND() {goto checkend; checkend_return:;}
11099 #define PARSEREDIR() {goto parseredir; parseredir_return:;}
11100 #define PARSESUB() {goto parsesub; parsesub_return:;}
11101 #define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;}
11102 #define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;}
11103 #define PARSEARITH() {goto parsearith; parsearith_return:;}
11105 readtoken1(int c, int syntax, char *eofmark, int striptabs)
11107 /* NB: syntax parameter fits into smallint */
11108 /* c parameter is an unsigned char or PEOF or PEOA */
11111 char line[EOFMARKLEN + 1];
11112 struct nodelist *bqlist;
11116 smallint prevsyntax; /* syntax before arithmetic */
11117 #if ENABLE_ASH_EXPAND_PRMT
11118 smallint pssyntax; /* we are expanding a prompt string */
11120 int varnest; /* levels of variables expansion */
11121 int arinest; /* levels of arithmetic expansion */
11122 int parenlevel; /* levels of parens in arithmetic */
11123 int dqvarnest; /* levels of variables expansion within double quotes */
11125 IF_ASH_BASH_COMPAT(smallint bash_dollar_squote = 0;)
11128 /* Avoid longjmp clobbering */
11134 (void) &parenlevel;
11137 (void) &prevsyntax;
11140 startlinno = g_parsefile->linno;
11144 #if ENABLE_ASH_EXPAND_PRMT
11145 pssyntax = (syntax == PSSYNTAX);
11149 dblquote = (syntax == DQSYNTAX);
11155 STARTSTACKSTR(out);
11157 /* For each line, until end of word */
11158 CHECKEND(); /* set c to PEOF if at end of here document */
11159 for (;;) { /* until end of line or end of word */
11160 CHECKSTRSPACE(4, out); /* permit 4 calls to USTPUTC */
11161 switch (SIT(c, syntax)) {
11162 case CNL: /* '\n' */
11163 if (syntax == BASESYNTAX)
11164 goto endword; /* exit outer loop */
11166 g_parsefile->linno++;
11167 setprompt_if(doprompt, 2);
11169 goto loop; /* continue outer loop */
11174 if (eofmark == NULL || dblquote)
11175 USTPUTC(CTLESC, out);
11176 #if ENABLE_ASH_BASH_COMPAT
11177 if (c == '\\' && bash_dollar_squote) {
11178 c = decode_dollar_squote();
11180 USTPUTC('\\', out);
11181 c = (unsigned char)c;
11187 case CBACK: /* backslash */
11188 c = pgetc_without_PEOA();
11190 USTPUTC(CTLESC, out);
11191 USTPUTC('\\', out);
11193 } else if (c == '\n') {
11194 setprompt_if(doprompt, 2);
11196 #if ENABLE_ASH_EXPAND_PRMT
11197 if (c == '$' && pssyntax) {
11198 USTPUTC(CTLESC, out);
11199 USTPUTC('\\', out);
11202 /* Backslash is retained if we are in "str" and next char isn't special */
11207 && (c != '"' || eofmark != NULL)
11209 USTPUTC(CTLESC, out);
11210 USTPUTC('\\', out);
11212 if (SIT(c, SQSYNTAX) == CCTL)
11213 USTPUTC(CTLESC, out);
11221 if (eofmark == NULL) {
11222 USTPUTC(CTLQUOTEMARK, out);
11230 IF_ASH_BASH_COMPAT(bash_dollar_squote = 0;)
11231 if (eofmark != NULL && arinest == 0
11236 if (dqvarnest == 0) {
11237 syntax = BASESYNTAX;
11244 case CVAR: /* '$' */
11245 PARSESUB(); /* parse substitution */
11247 case CENDVAR: /* '}' */
11250 if (dqvarnest > 0) {
11257 #if ENABLE_SH_MATH_SUPPORT
11258 case CLP: /* '(' in arithmetic */
11262 case CRP: /* ')' in arithmetic */
11263 if (parenlevel > 0) {
11266 if (pgetc() == ')') {
11267 if (--arinest == 0) {
11268 syntax = prevsyntax;
11269 dblquote = (syntax == DQSYNTAX);
11274 * unbalanced parens
11275 * (don't 2nd guess - no error)
11283 case CBQUOTE: /* '`' */
11287 goto endword; /* exit outer loop */
11291 if (varnest == 0) {
11292 #if ENABLE_ASH_BASH_COMPAT
11294 if (pgetc() == '>')
11295 c = 0x100 + '>'; /* flag &> */
11299 goto endword; /* exit outer loop */
11301 IF_ASH_ALIAS(if (c != PEOA))
11308 #if ENABLE_SH_MATH_SUPPORT
11309 if (syntax == ARISYNTAX)
11310 raise_error_syntax("missing '))'");
11312 if (syntax != BASESYNTAX && !parsebackquote && eofmark == NULL)
11313 raise_error_syntax("unterminated quoted string");
11314 if (varnest != 0) {
11315 startlinno = g_parsefile->linno;
11317 raise_error_syntax("missing '}'");
11319 USTPUTC('\0', out);
11320 len = out - (char *)stackblock();
11321 out = stackblock();
11322 if (eofmark == NULL) {
11323 if ((c == '>' || c == '<' IF_ASH_BASH_COMPAT( || c == 0x100 + '>'))
11326 if (isdigit_str9(out)) {
11327 PARSEREDIR(); /* passed as params: out, c */
11328 lasttoken = TREDIR;
11331 /* else: non-number X seen, interpret it
11332 * as "NNNX>file" = "NNNX >file" */
11336 quoteflag = quotef;
11337 backquotelist = bqlist;
11338 grabstackblock(len);
11342 /* end of readtoken routine */
11345 * Check to see whether we are at the end of the here document. When this
11346 * is called, c is set to the first character of the next input line. If
11347 * we are at the end of the here document, this routine sets the c to PEOF.
11351 #if ENABLE_ASH_ALIAS
11353 c = pgetc_without_PEOA();
11356 while (c == '\t') {
11357 c = pgetc_without_PEOA();
11360 if (c == *eofmark) {
11361 if (pfgets(line, sizeof(line)) != NULL) {
11365 for (q = eofmark + 1; *q && *p == *q; p++, q++)
11367 if (*p == '\n' && *q == '\0') {
11369 g_parsefile->linno++;
11370 needprompt = doprompt;
11372 pushstring(line, NULL);
11377 goto checkend_return;
11381 * Parse a redirection operator. The variable "out" points to a string
11382 * specifying the fd to be redirected. The variable "c" contains the
11383 * first character of the redirection operator.
11386 /* out is already checked to be a valid number or "" */
11387 int fd = (*out == '\0' ? -1 : atoi(out));
11390 np = stzalloc(sizeof(struct nfile));
11395 np->type = NAPPEND;
11397 np->type = NCLOBBER;
11400 /* it also can be NTO2 (>&file), but we can't figure it out yet */
11406 #if ENABLE_ASH_BASH_COMPAT
11407 else if (c == 0x100 + '>') { /* this flags &> redirection */
11409 pgetc(); /* this is '>', no need to check */
11413 else { /* c == '<' */
11414 /*np->nfile.fd = 0; - stzalloc did it */
11418 if (sizeof(struct nfile) != sizeof(struct nhere)) {
11419 np = stzalloc(sizeof(struct nhere));
11420 /*np->nfile.fd = 0; - stzalloc did it */
11423 heredoc = stzalloc(sizeof(struct heredoc));
11424 heredoc->here = np;
11427 heredoc->striptabs = 1;
11429 /*heredoc->striptabs = 0; - stzalloc did it */
11435 np->type = NFROMFD;
11439 np->type = NFROMTO;
11451 goto parseredir_return;
11455 * Parse a substitution. At this point, we have read the dollar sign
11456 * and nothing else.
11459 /* is_special(c) evaluates to 1 for c in "!#$*-0123456789?@"; 0 otherwise
11460 * (assuming ascii char codes, as the original implementation did) */
11461 #define is_special(c) \
11462 (((unsigned)(c) - 33 < 32) \
11463 && ((0xc1ff920dU >> ((unsigned)(c) - 33)) & 1))
11465 unsigned char subtype;
11470 if (c > 255 /* PEOA or PEOF */
11471 || (c != '(' && c != '{' && !is_name(c) && !is_special(c))
11473 #if ENABLE_ASH_BASH_COMPAT
11475 bash_dollar_squote = 1;
11480 } else if (c == '(') {
11481 /* $(command) or $((arith)) */
11482 if (pgetc() == '(') {
11483 #if ENABLE_SH_MATH_SUPPORT
11486 raise_error_syntax("you disabled math support for $((arith)) syntax");
11493 /* $VAR, $<specialchar>, ${...}, or PEOA/PEOF */
11494 USTPUTC(CTLVAR, out);
11495 typeloc = out - (char *)stackblock();
11496 USTPUTC(VSNORMAL, out);
11497 subtype = VSNORMAL;
11503 c = '#'; /* ${#} - same as $# */
11505 subtype = VSLENGTH; /* ${#VAR} */
11510 if (c <= 255 /* not PEOA or PEOF */ && is_name(c)) {
11511 /* $[{[#]]NAME[}] */
11515 } while (c <= 255 /* not PEOA or PEOF */ && is_in_name(c));
11516 } else if (isdigit(c)) {
11517 /* $[{[#]]NUM[}] */
11521 } while (isdigit(c));
11522 } else if (is_special(c)) {
11523 /* $[{[#]]<specialchar>[}] */
11528 raise_error_syntax("bad substitution");
11530 if (c != '}' && subtype == VSLENGTH) {
11531 /* ${#VAR didn't end with } */
11537 if (subtype == 0) {
11538 /* ${VAR...} but not $VAR or ${#VAR} */
11539 /* c == first char after VAR */
11543 #if ENABLE_ASH_BASH_COMPAT
11544 if (c == ':' || c == '$' || isdigit(c)) {
11545 //TODO: support more general format ${v:EXPR:EXPR},
11546 // where EXPR follows $(()) rules
11547 subtype = VSSUBSTR;
11549 break; /* "goto do_pungetc" is bigger (!) */
11555 static const char types[] ALIGN1 = "}-+?=";
11556 const char *p = strchr(types, c);
11559 subtype = p - types + VSNORMAL;
11565 subtype = (c == '#' ? VSTRIMLEFT : VSTRIMRIGHT);
11572 #if ENABLE_ASH_BASH_COMPAT
11574 /* ${v/[/]pattern/repl} */
11575 //TODO: encode pattern and repl separately.
11576 // Currently ${v/$var_with_slash/repl} is horribly broken
11577 subtype = VSREPLACE;
11581 subtype++; /* VSREPLACEALL */
11589 if (dblquote || arinest)
11591 ((unsigned char *)stackblock())[typeloc] = subtype | flags;
11592 if (subtype != VSNORMAL) {
11594 if (dblquote || arinest) {
11599 goto parsesub_return;
11603 * Called to parse command substitutions. Newstyle is set if the command
11604 * is enclosed inside $(...); nlpp is a pointer to the head of the linked
11605 * list of commands (passed by reference), and savelen is the number of
11606 * characters on the top of the stack which must be preserved.
11609 struct nodelist **nlpp;
11612 char *volatile str;
11613 struct jmploc jmploc;
11614 struct jmploc *volatile savehandler;
11616 smallint saveprompt = 0;
11619 (void) &saveprompt;
11621 savepbq = parsebackquote;
11622 if (setjmp(jmploc.loc)) {
11624 parsebackquote = 0;
11625 exception_handler = savehandler;
11626 longjmp(exception_handler->loc, 1);
11630 savelen = out - (char *)stackblock();
11632 str = ckmalloc(savelen);
11633 memcpy(str, stackblock(), savelen);
11635 savehandler = exception_handler;
11636 exception_handler = &jmploc;
11639 /* We must read until the closing backquote, giving special
11640 treatment to some slashes, and then push the string and
11641 reread it as input, interpreting it normally. */
11646 STARTSTACKSTR(pout);
11650 setprompt_if(needprompt, 2);
11659 g_parsefile->linno++;
11660 setprompt_if(doprompt, 2);
11662 * If eating a newline, avoid putting
11663 * the newline into the new character
11664 * stream (via the STPUTC after the
11669 if (pc != '\\' && pc != '`' && pc != '$'
11670 && (!dblquote || pc != '"')
11672 STPUTC('\\', pout);
11674 if (pc <= 255 /* not PEOA or PEOF */) {
11680 IF_ASH_ALIAS(case PEOA:)
11681 startlinno = g_parsefile->linno;
11682 raise_error_syntax("EOF in backquote substitution");
11685 g_parsefile->linno++;
11686 needprompt = doprompt;
11695 STPUTC('\0', pout);
11696 psavelen = pout - (char *)stackblock();
11697 if (psavelen > 0) {
11698 pstr = grabstackstr(pout);
11699 setinputstring(pstr);
11704 nlpp = &(*nlpp)->next;
11705 *nlpp = stzalloc(sizeof(**nlpp));
11706 /* (*nlpp)->next = NULL; - stzalloc did it */
11707 parsebackquote = oldstyle;
11710 saveprompt = doprompt;
11717 doprompt = saveprompt;
11718 else if (readtoken() != TRP)
11719 raise_error_unexpected_syntax(TRP);
11724 * Start reading from old file again, ignoring any pushed back
11725 * tokens left from the backquote parsing
11730 while (stackblocksize() <= savelen)
11732 STARTSTACKSTR(out);
11734 memcpy(out, str, savelen);
11735 STADJUST(savelen, out);
11741 parsebackquote = savepbq;
11742 exception_handler = savehandler;
11743 if (arinest || dblquote)
11744 USTPUTC(CTLBACKQ | CTLQUOTE, out);
11746 USTPUTC(CTLBACKQ, out);
11748 goto parsebackq_oldreturn;
11749 goto parsebackq_newreturn;
11752 #if ENABLE_SH_MATH_SUPPORT
11754 * Parse an arithmetic expansion (indicate start of one and set state)
11757 if (++arinest == 1) {
11758 prevsyntax = syntax;
11759 syntax = ARISYNTAX;
11760 USTPUTC(CTLARI, out);
11767 * we collapse embedded arithmetic expansion to
11768 * parenthesis, which should be equivalent
11772 goto parsearith_return;
11776 } /* end of readtoken */
11779 * Read the next input token.
11780 * If the token is a word, we set backquotelist to the list of cmds in
11781 * backquotes. We set quoteflag to true if any part of the word was
11783 * If the token is TREDIR, then we set redirnode to a structure containing
11785 * In all cases, the variable startlinno is set to the number of the line
11786 * on which the token starts.
11788 * [Change comment: here documents and internal procedures]
11789 * [Readtoken shouldn't have any arguments. Perhaps we should make the
11790 * word parsing code into a separate routine. In this case, readtoken
11791 * doesn't need to have any internal procedures, but parseword does.
11792 * We could also make parseoperator in essence the main routine, and
11793 * have parseword (readtoken1?) handle both words and redirection.]
11795 #define NEW_xxreadtoken
11796 #ifdef NEW_xxreadtoken
11797 /* singles must be first! */
11798 static const char xxreadtoken_chars[7] ALIGN1 = {
11799 '\n', '(', ')', /* singles */
11800 '&', '|', ';', /* doubles */
11804 #define xxreadtoken_singles 3
11805 #define xxreadtoken_doubles 3
11807 static const char xxreadtoken_tokens[] ALIGN1 = {
11808 TNL, TLP, TRP, /* only single occurrence allowed */
11809 TBACKGND, TPIPE, TSEMI, /* if single occurrence */
11810 TEOF, /* corresponds to trailing nul */
11811 TAND, TOR, TENDCASE /* if double occurrence */
11823 setprompt_if(needprompt, 2);
11824 startlinno = g_parsefile->linno;
11825 for (;;) { /* until token or start of word found */
11827 if (c == ' ' || c == '\t' IF_ASH_ALIAS( || c == PEOA))
11831 while ((c = pgetc()) != '\n' && c != PEOF)
11834 } else if (c == '\\') {
11835 if (pgetc() != '\n') {
11837 break; /* return readtoken1(...) */
11839 startlinno = ++g_parsefile->linno;
11840 setprompt_if(doprompt, 2);
11844 p = xxreadtoken_chars + sizeof(xxreadtoken_chars) - 1;
11847 g_parsefile->linno++;
11848 needprompt = doprompt;
11851 p = strchr(xxreadtoken_chars, c);
11853 break; /* return readtoken1(...) */
11855 if ((int)(p - xxreadtoken_chars) >= xxreadtoken_singles) {
11857 if (cc == c) { /* double occurrence? */
11858 p += xxreadtoken_doubles + 1;
11861 #if ENABLE_ASH_BASH_COMPAT
11862 if (c == '&' && cc == '>') /* &> */
11863 break; /* return readtoken1(...) */
11868 lasttoken = xxreadtoken_tokens[p - xxreadtoken_chars];
11873 return readtoken1(c, BASESYNTAX, (char *) NULL, 0);
11875 #else /* old xxreadtoken */
11876 #define RETURN(token) return lasttoken = token
11886 setprompt_if(needprompt, 2);
11887 startlinno = g_parsefile->linno;
11888 for (;;) { /* until token or start of word found */
11891 case ' ': case '\t':
11892 IF_ASH_ALIAS(case PEOA:)
11895 while ((c = pgetc()) != '\n' && c != PEOF)
11900 if (pgetc() == '\n') {
11901 startlinno = ++g_parsefile->linno;
11902 setprompt_if(doprompt, 2);
11908 g_parsefile->linno++;
11909 needprompt = doprompt;
11914 if (pgetc() == '&')
11919 if (pgetc() == '|')
11924 if (pgetc() == ';')
11937 return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
11940 #endif /* old xxreadtoken */
11947 smallint alreadyseen = tokpushback;
11950 #if ENABLE_ASH_ALIAS
11959 if (checkkwd & CHKNL) {
11966 if (t != TWORD || quoteflag) {
11971 * check for keywords
11973 if (checkkwd & CHKKWD) {
11974 const char *const *pp;
11976 pp = findkwd(wordtext);
11978 lasttoken = t = pp - tokname_array;
11979 TRACE(("keyword '%s' recognized\n", tokname_array[t] + 1));
11984 if (checkkwd & CHKALIAS) {
11985 #if ENABLE_ASH_ALIAS
11987 ap = lookupalias(wordtext, 1);
11990 pushstring(ap->val, ap);
12000 TRACE(("token '%s' %s\n", tokname_array[t] + 1, t == TWORD ? wordtext : ""));
12002 TRACE(("reread token '%s' %s\n", tokname_array[t] + 1, t == TWORD ? wordtext : ""));
12014 return tokname_array[t][0];
12018 * Read and parse a command. Returns NODE_EOF on end of file.
12019 * (NULL is a valid parse tree indicating a blank line.)
12021 static union node *
12022 parsecmd(int interact)
12027 doprompt = interact;
12028 setprompt_if(doprompt, doprompt);
12040 * Input any here documents.
12045 struct heredoc *here;
12048 here = heredoclist;
12049 heredoclist = NULL;
12052 setprompt_if(needprompt, 2);
12053 readtoken1(pgetc(), here->here->type == NHERE ? SQSYNTAX : DQSYNTAX,
12054 here->eofmark, here->striptabs);
12055 n = stzalloc(sizeof(struct narg));
12056 n->narg.type = NARG;
12057 /*n->narg.next = NULL; - stzalloc did it */
12058 n->narg.text = wordtext;
12059 n->narg.backquote = backquotelist;
12060 here->here->nhere.doc = n;
12067 * called by editline -- any expansions to the prompt should be added here.
12069 #if ENABLE_ASH_EXPAND_PRMT
12070 static const char *
12071 expandstr(const char *ps)
12075 /* XXX Fix (char *) cast. It _is_ a bug. ps is variable's value,
12076 * and token processing _can_ alter it (delete NULs etc). */
12077 setinputstring((char *)ps);
12078 readtoken1(pgetc(), PSSYNTAX, nullstr, 0);
12081 n.narg.type = NARG;
12082 n.narg.next = NULL;
12083 n.narg.text = wordtext;
12084 n.narg.backquote = backquotelist;
12086 expandarg(&n, NULL, 0);
12087 return stackblock();
12092 * Execute a command or commands contained in a string.
12095 evalstring(char *s, int mask)
12098 struct stackmark smark;
12102 setstackmark(&smark);
12105 while ((n = parsecmd(0)) != NODE_EOF) {
12107 popstackmark(&smark);
12120 * The eval command.
12122 static int FAST_FUNC
12123 evalcmd(int argc UNUSED_PARAM, char **argv)
12132 STARTSTACKSTR(concat);
12134 concat = stack_putstr(p, concat);
12138 STPUTC(' ', concat);
12140 STPUTC('\0', concat);
12141 p = grabstackstr(concat);
12143 evalstring(p, ~SKIPEVAL);
12149 * Read and execute commands.
12150 * "Top" is nonzero for the top level command loop;
12151 * it turns on prompting if the shell is interactive.
12157 struct stackmark smark;
12161 TRACE(("cmdloop(%d) called\n", top));
12165 setstackmark(&smark);
12168 showjobs(stderr, SHOW_CHANGED);
12171 if (iflag && top) {
12175 n = parsecmd(inter);
12177 if (DEBUG > 2 && debug && (n != NODE_EOF))
12180 if (n == NODE_EOF) {
12181 if (!top || numeof >= 50)
12183 if (!stoppedjobs()) {
12186 out2str("\nUse \"exit\" to leave shell.\n");
12189 } else if (nflag == 0) {
12190 /* job_warning can only be 2,1,0. Here 2->1, 1/0->0 */
12195 popstackmark(&smark);
12200 return skip & SKIPEVAL;
12207 * Take commands from a file. To be compatible we should do a path
12208 * search for the file, which is necessary to find sub-commands.
12211 find_dot_file(char *name)
12214 const char *path = pathval();
12217 /* don't try this for absolute or relative paths */
12218 if (strchr(name, '/'))
12221 /* IIRC standards do not say whether . is to be searched.
12222 * And it is even smaller this way, making it unconditional for now:
12224 if (1) { /* ENABLE_ASH_BASH_COMPAT */
12229 while ((fullname = path_advance(&path, name)) != NULL) {
12231 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
12233 * Don't bother freeing here, since it will
12234 * be freed by the caller.
12238 if (fullname != name)
12239 stunalloc(fullname);
12242 /* not found in the PATH */
12243 ash_msg_and_raise_error("%s: not found", name);
12247 static int FAST_FUNC
12248 dotcmd(int argc, char **argv)
12251 struct strlist *sp;
12252 volatile struct shparam saveparam;
12254 for (sp = cmdenviron; sp; sp = sp->next)
12255 setvareq(ckstrdup(sp->text), VSTRFIXED | VTEXTFIXED);
12258 /* bash says: "bash: .: filename argument required" */
12259 return 2; /* bash compat */
12262 /* "false; . empty_file; echo $?" should print 0, not 1: */
12265 fullname = find_dot_file(argv[1]);
12269 if (argc) { /* argc > 0, argv[0] != NULL */
12270 saveparam = shellparam;
12271 shellparam.malloced = 0;
12272 shellparam.nparam = argc;
12273 shellparam.p = argv;
12276 setinputfile(fullname, INPUT_PUSH_FILE);
12277 commandname = fullname;
12282 freeparam(&shellparam);
12283 shellparam = saveparam;
12289 static int FAST_FUNC
12290 exitcmd(int argc UNUSED_PARAM, char **argv)
12295 exitstatus = number(argv[1]);
12296 raise_exception(EXEXIT);
12301 * Read a file containing shell functions.
12304 readcmdfile(char *name)
12306 setinputfile(name, INPUT_PUSH_FILE);
12312 /* ============ find_command inplementation */
12315 * Resolve a command name. If you change this routine, you may have to
12316 * change the shellexec routine as well.
12319 find_command(char *name, struct cmdentry *entry, int act, const char *path)
12321 struct tblentry *cmdp;
12328 struct builtincmd *bcmd;
12330 /* If name contains a slash, don't use PATH or hash table */
12331 if (strchr(name, '/') != NULL) {
12332 entry->u.index = -1;
12333 if (act & DO_ABS) {
12334 while (stat(name, &statb) < 0) {
12336 if (errno == EINTR)
12339 entry->cmdtype = CMDUNKNOWN;
12343 entry->cmdtype = CMDNORMAL;
12347 /* #if ENABLE_FEATURE_SH_STANDALONE... moved after builtin check */
12349 updatetbl = (path == pathval());
12352 if (strstr(path, "%builtin") != NULL)
12353 act |= DO_ALTBLTIN;
12356 /* If name is in the table, check answer will be ok */
12357 cmdp = cmdlookup(name, 0);
12358 if (cmdp != NULL) {
12361 switch (cmdp->cmdtype) {
12379 } else if (cmdp->rehash == 0)
12380 /* if not invalidated by cd, we're done */
12384 /* If %builtin not in path, check for builtin next */
12385 bcmd = find_builtin(name);
12387 if (IS_BUILTIN_REGULAR(bcmd))
12388 goto builtin_success;
12389 if (act & DO_ALTPATH) {
12390 if (!(act & DO_ALTBLTIN))
12391 goto builtin_success;
12392 } else if (builtinloc <= 0) {
12393 goto builtin_success;
12397 #if ENABLE_FEATURE_SH_STANDALONE
12399 int applet_no = find_applet_by_name(name);
12400 if (applet_no >= 0) {
12401 entry->cmdtype = CMDNORMAL;
12402 entry->u.index = -2 - applet_no;
12408 /* We have to search path. */
12409 prev = -1; /* where to start */
12410 if (cmdp && cmdp->rehash) { /* doing a rehash */
12411 if (cmdp->cmdtype == CMDBUILTIN)
12414 prev = cmdp->param.index;
12420 while ((fullname = path_advance(&path, name)) != NULL) {
12421 stunalloc(fullname);
12422 /* NB: code below will still use fullname
12423 * despite it being "unallocated" */
12426 if (prefix(pathopt, "builtin")) {
12428 goto builtin_success;
12431 if ((act & DO_NOFUNC)
12432 || !prefix(pathopt, "func")
12433 ) { /* ignore unimplemented options */
12437 /* if rehash, don't redo absolute path names */
12438 if (fullname[0] == '/' && idx <= prev) {
12441 TRACE(("searchexec \"%s\": no change\n", name));
12444 while (stat(fullname, &statb) < 0) {
12446 if (errno == EINTR)
12449 if (errno != ENOENT && errno != ENOTDIR)
12453 e = EACCES; /* if we fail, this will be the error */
12454 if (!S_ISREG(statb.st_mode))
12456 if (pathopt) { /* this is a %func directory */
12457 stalloc(strlen(fullname) + 1);
12458 /* NB: stalloc will return space pointed by fullname
12459 * (because we don't have any intervening allocations
12460 * between stunalloc above and this stalloc) */
12461 readcmdfile(fullname);
12462 cmdp = cmdlookup(name, 0);
12463 if (cmdp == NULL || cmdp->cmdtype != CMDFUNCTION)
12464 ash_msg_and_raise_error("%s not defined in %s", name, fullname);
12465 stunalloc(fullname);
12468 TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
12470 entry->cmdtype = CMDNORMAL;
12471 entry->u.index = idx;
12475 cmdp = cmdlookup(name, 1);
12476 cmdp->cmdtype = CMDNORMAL;
12477 cmdp->param.index = idx;
12482 /* We failed. If there was an entry for this command, delete it */
12483 if (cmdp && updatetbl)
12484 delete_cmd_entry();
12486 ash_msg("%s: %s", name, errmsg(e, "not found"));
12487 entry->cmdtype = CMDUNKNOWN;
12492 entry->cmdtype = CMDBUILTIN;
12493 entry->u.cmd = bcmd;
12497 cmdp = cmdlookup(name, 1);
12498 cmdp->cmdtype = CMDBUILTIN;
12499 cmdp->param.cmd = bcmd;
12503 entry->cmdtype = cmdp->cmdtype;
12504 entry->u = cmdp->param;
12508 /* ============ trap.c */
12511 * The trap builtin.
12513 static int FAST_FUNC
12514 trapcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12518 int signo, exitcode;
12523 for (signo = 0; signo < NSIG; signo++) {
12524 char *tr = trap_ptr[signo];
12526 /* note: bash adds "SIG", but only if invoked
12527 * as "bash". If called as "sh", or if set -o posix,
12528 * then it prints short signal names.
12529 * We are printing short names: */
12530 out1fmt("trap -- %s %s\n",
12532 get_signame(signo));
12533 /* trap_ptr != trap only if we are in special-cased `trap` code.
12534 * In this case, we will exit very soon, no need to free(). */
12535 /* if (trap_ptr != trap && tp[0]) */
12540 if (trap_ptr != trap) {
12553 signo = get_signum(*ap);
12555 /* Mimic bash message exactly */
12556 ash_msg("%s: invalid signal specification", *ap);
12562 if (LONE_DASH(action))
12565 action = ckstrdup(action);
12569 may_have_traps = 1;
12570 trap[signo] = action;
12581 /* ============ Builtins */
12583 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
12585 * Lists available builtins
12587 static int FAST_FUNC
12588 helpcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12594 "Built-in commands:\n"
12595 "------------------\n");
12596 for (col = 0, i = 0; i < ARRAY_SIZE(builtintab); i++) {
12597 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '),
12598 builtintab[i].name + 1);
12604 #if ENABLE_FEATURE_SH_STANDALONE
12606 const char *a = applet_names;
12608 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '), a);
12613 a += strlen(a) + 1;
12618 return EXIT_SUCCESS;
12620 #endif /* FEATURE_SH_EXTRA_QUIET */
12623 * The export and readonly commands.
12625 static int FAST_FUNC
12626 exportcmd(int argc UNUSED_PARAM, char **argv)
12632 int flag = argv[0][0] == 'r' ? VREADONLY : VEXPORT;
12634 if (nextopt("p") != 'p') {
12639 p = strchr(name, '=');
12643 vp = *findvar(hashvar(name), name);
12649 setvar(name, p, flag);
12650 } while ((name = *++aptr) != NULL);
12654 showvars(argv[0], flag, 0);
12659 * Delete a function if it exists.
12662 unsetfunc(const char *name)
12664 struct tblentry *cmdp;
12666 cmdp = cmdlookup(name, 0);
12667 if (cmdp != NULL && cmdp->cmdtype == CMDFUNCTION)
12668 delete_cmd_entry();
12672 * The unset builtin command. We unset the function before we unset the
12673 * variable to allow a function to be unset when there is a readonly variable
12674 * with the same name.
12676 static int FAST_FUNC
12677 unsetcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12684 while ((i = nextopt("vf")) != 0) {
12688 for (ap = argptr; *ap; ap++) {
12701 static const unsigned char timescmd_str[] ALIGN1 = {
12702 ' ', offsetof(struct tms, tms_utime),
12703 '\n', offsetof(struct tms, tms_stime),
12704 ' ', offsetof(struct tms, tms_cutime),
12705 '\n', offsetof(struct tms, tms_cstime),
12708 static int FAST_FUNC
12709 timescmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12711 unsigned long clk_tck, s, t;
12712 const unsigned char *p;
12715 clk_tck = sysconf(_SC_CLK_TCK);
12720 t = *(clock_t *)(((char *) &buf) + p[1]);
12723 out1fmt("%lum%lu.%03lus%c",
12725 (t * 1000) / clk_tck,
12733 #if ENABLE_SH_MATH_SUPPORT
12735 * The let builtin. Partially stolen from GNU Bash, the Bourne Again SHell.
12736 * Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
12738 * Copyright (C) 2003 Vladimir Oleynik <dzo@simtreas.ru>
12740 static int FAST_FUNC
12741 letcmd(int argc UNUSED_PARAM, char **argv)
12747 ash_msg_and_raise_error("expression expected");
12749 i = ash_arith(*argv);
12757 * The read builtin. Options:
12758 * -r Do not interpret '\' specially
12759 * -s Turn off echo (tty only)
12760 * -n NCHARS Read NCHARS max
12761 * -p PROMPT Display PROMPT on stderr (if input is from tty)
12762 * -t SECONDS Timeout after SECONDS (tty or pipe only)
12763 * -u FD Read from given FD instead of fd 0
12764 * This uses unbuffered input, which may be avoidable in some cases.
12765 * TODO: bash also has:
12766 * -a ARRAY Read into array[0],[1],etc
12767 * -d DELIM End on DELIM char, not newline
12768 * -e Use line editing (tty only)
12770 static int FAST_FUNC
12771 readcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12773 char *opt_n = NULL;
12774 char *opt_p = NULL;
12775 char *opt_t = NULL;
12776 char *opt_u = NULL;
12777 int read_flags = 0;
12781 while ((i = nextopt("p:u:rt:n:s")) != '\0') {
12790 read_flags |= BUILTIN_READ_SILENT;
12796 read_flags |= BUILTIN_READ_RAW;
12806 r = shell_builtin_read(setvar2,
12808 bltinlookup("IFS"), /* can be NULL */
12816 if ((uintptr_t)r > 1)
12817 ash_msg_and_raise_error(r);
12819 return (uintptr_t)r;
12822 static int FAST_FUNC
12823 umaskcmd(int argc UNUSED_PARAM, char **argv)
12825 static const char permuser[3] ALIGN1 = "ugo";
12826 static const char permmode[3] ALIGN1 = "rwx";
12827 static const short permmask[] ALIGN2 = {
12828 S_IRUSR, S_IWUSR, S_IXUSR,
12829 S_IRGRP, S_IWGRP, S_IXGRP,
12830 S_IROTH, S_IWOTH, S_IXOTH
12833 /* TODO: use bb_parse_mode() instead */
12838 int symbolic_mode = 0;
12840 while (nextopt("S") != '\0') {
12851 if (symbolic_mode) {
12855 for (i = 0; i < 3; i++) {
12858 *p++ = permuser[i];
12860 for (j = 0; j < 3; j++) {
12861 if ((mask & permmask[3 * i + j]) == 0) {
12862 *p++ = permmode[j];
12870 out1fmt("%.4o\n", mask);
12873 if (isdigit((unsigned char) *ap)) {
12876 if (*ap >= '8' || *ap < '0')
12877 ash_msg_and_raise_error(msg_illnum, argv[1]);
12878 mask = (mask << 3) + (*ap - '0');
12879 } while (*++ap != '\0');
12882 mask = ~mask & 0777;
12883 if (!bb_parse_mode(ap, &mask)) {
12884 ash_msg_and_raise_error("illegal mode: %s", ap);
12886 umask(~mask & 0777);
12892 static int FAST_FUNC
12893 ulimitcmd(int argc UNUSED_PARAM, char **argv)
12895 return shell_builtin_ulimit(argv);
12898 /* ============ main() and helpers */
12901 * Called to exit the shell.
12910 #if ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
12911 save_history(line_input_state);
12914 status = exitstatus;
12915 TRACE(("pid %d, exitshell(%d)\n", getpid(), status));
12916 if (setjmp(loc.loc)) {
12917 if (exception_type == EXEXIT)
12918 /* dash bug: it just does _exit(exitstatus) here
12919 * but we have to do setjobctl(0) first!
12920 * (bug is still not fixed in dash-0.5.3 - if you run dash
12921 * under Midnight Commander, on exit from dash MC is backgrounded) */
12922 status = exitstatus;
12925 exception_handler = &loc;
12932 flush_stdout_stderr();
12942 /* from input.c: */
12943 /* we will never free this */
12944 basepf.next_to_pgetc = basepf.buf = ckmalloc(IBUFSIZ);
12947 signal(SIGCHLD, SIG_DFL);
12948 /* bash re-enables SIGHUP which is SIG_IGNed on entry.
12949 * Try: "trap '' HUP; bash; echo RET" and type "kill -HUP $$"
12951 signal(SIGHUP, SIG_DFL);
12957 struct stat st1, st2;
12960 for (envp = environ; envp && *envp; envp++) {
12961 if (strchr(*envp, '=')) {
12962 setvareq(*envp, VEXPORT|VTEXTFIXED);
12966 setvar("PPID", utoa(getppid()), 0);
12968 p = lookupvar("PWD");
12970 if (*p != '/' || stat(p, &st1) || stat(".", &st2)
12971 || st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino
12981 //usage:#define ash_trivial_usage
12982 //usage: "[-/+OPTIONS] [-/+o OPT]... [-c 'SCRIPT' [ARG0 [ARGS]] / FILE [ARGS]]"
12983 //usage:#define ash_full_usage "\n\n"
12984 //usage: "Unix shell interpreter"
12986 //usage:#if ENABLE_FEATURE_SH_IS_ASH
12987 //usage:# define sh_trivial_usage ash_trivial_usage
12988 //usage:# define sh_full_usage ash_full_usage
12990 //usage:#if ENABLE_FEATURE_BASH_IS_ASH
12991 //usage:# define bash_trivial_usage ash_trivial_usage
12992 //usage:# define bash_full_usage ash_full_usage
12996 * Process the shell command line arguments.
12999 procargs(char **argv)
13002 const char *xminusc;
13007 /* if (xargv[0]) - mmm, this is always true! */
13009 for (i = 0; i < NOPTS; i++)
13012 if (options(/*cmdline:*/ 1)) {
13013 /* it already printed err message */
13014 raise_exception(EXERROR);
13018 if (*xargv == NULL) {
13020 ash_msg_and_raise_error(bb_msg_requires_arg, "-c");
13023 if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
13027 for (i = 0; i < NOPTS; i++)
13028 if (optlist[i] == 2)
13033 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
13038 } else if (!sflag) {
13039 setinputfile(*xargv, 0);
13042 commandname = arg0;
13045 shellparam.p = xargv;
13046 #if ENABLE_ASH_GETOPTS
13047 shellparam.optind = 1;
13048 shellparam.optoff = -1;
13050 /* assert(shellparam.malloced == 0 && shellparam.nparam == 0); */
13052 shellparam.nparam++;
13059 * Read /etc/profile or .profile.
13062 read_profile(const char *name)
13066 if (setinputfile(name, INPUT_PUSH_FILE | INPUT_NOFILE_OK) < 0)
13075 * This routine is called when an error or an interrupt occurs in an
13076 * interactive shell and control is returned to the main command loop.
13084 /* from input.c: */
13085 g_parsefile->left_in_buffer = 0;
13086 g_parsefile->left_in_line = 0; /* clear input buffer */
13088 /* from parser.c: */
13091 /* from redir.c: */
13092 clearredir(/*drop:*/ 0);
13096 static short profile_buf[16384];
13097 extern int etext();
13101 * Main routine. We initialize things, parse the arguments, execute
13102 * profiles if we're a login shell, and then call cmdloop to execute
13103 * commands. The setjmp call sets up the location to jump to when an
13104 * exception occurs. When an exception occurs the variable "state"
13105 * is used to figure out how far we had gotten.
13107 int ash_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
13108 int ash_main(int argc UNUSED_PARAM, char **argv)
13110 const char *shinit;
13111 volatile smallint state;
13112 struct jmploc jmploc;
13113 struct stackmark smark;
13115 /* Initialize global data */
13119 #if ENABLE_ASH_ALIAS
13125 monitor(4, etext, profile_buf, sizeof(profile_buf), 50);
13128 #if ENABLE_FEATURE_EDITING
13129 line_input_state = new_line_input_t(FOR_SHELL | WITH_PATH_LOOKUP);
13132 if (setjmp(jmploc.loc)) {
13138 e = exception_type;
13142 if (e == EXEXIT || s == 0 || iflag == 0 || shlvl) {
13146 outcslow('\n', stderr);
13149 popstackmark(&smark);
13150 FORCE_INT_ON; /* enable interrupts */
13159 exception_handler = &jmploc;
13162 TRACE(("Shell args: "));
13163 trace_puts_args(argv);
13165 rootpid = getpid();
13168 setstackmark(&smark);
13171 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
13173 const char *hp = lookupvar("HISTFILE");
13175 hp = lookupvar("HOME");
13177 char *defhp = concat_path_file(hp, ".ash_history");
13178 setvar("HISTFILE", defhp, 0);
13184 if (argv[0] && argv[0][0] == '-')
13188 read_profile("/etc/profile");
13191 read_profile(".profile");
13197 getuid() == geteuid() && getgid() == getegid() &&
13201 shinit = lookupvar("ENV");
13202 if (shinit != NULL && *shinit != '\0') {
13203 read_profile(shinit);
13209 /* evalstring pushes parsefile stack.
13210 * Ensure we don't falsely claim that 0 (stdin)
13211 * is one of stacked source fds.
13212 * Testcase: ash -c 'exec 1>&0' must not complain. */
13213 // if (!sflag) g_parsefile->pf_fd = -1;
13214 // ^^ not necessary since now we special-case fd 0
13215 // in is_hidden_fd() to not be considered "hidden fd"
13216 evalstring(minusc, 0);
13219 if (sflag || minusc == NULL) {
13220 #if MAX_HISTORY > 0 && ENABLE_FEATURE_EDITING_SAVEHISTORY
13222 const char *hp = lookupvar("HISTFILE");
13224 line_input_state->hist_file = hp;
13225 # if ENABLE_FEATURE_SH_HISTFILESIZE
13226 hp = lookupvar("HISTFILESIZE");
13227 line_input_state->max_history = size_from_HISTFILESIZE(hp);
13231 state4: /* XXX ??? - why isn't this before the "if" statement */
13239 extern void _mcleanup(void);
13243 TRACE(("End of main reached\n"));
13250 * Copyright (c) 1989, 1991, 1993, 1994
13251 * The Regents of the University of California. All rights reserved.
13253 * This code is derived from software contributed to Berkeley by
13254 * Kenneth Almquist.
13256 * Redistribution and use in source and binary forms, with or without
13257 * modification, are permitted provided that the following conditions
13259 * 1. Redistributions of source code must retain the above copyright
13260 * notice, this list of conditions and the following disclaimer.
13261 * 2. Redistributions in binary form must reproduce the above copyright
13262 * notice, this list of conditions and the following disclaimer in the
13263 * documentation and/or other materials provided with the distribution.
13264 * 3. Neither the name of the University nor the names of its contributors
13265 * may be used to endorse or promote products derived from this software
13266 * without specific prior written permission.
13268 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
13269 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
13270 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
13271 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
13272 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
13273 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
13274 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
13275 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
13276 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
13277 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF