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, resetloc;
6342 IF_ASH_BASH_COMPAT(int workloc;)
6344 char *(*scan)(char*, char*, char*, char*, int, int);
6346 //bb_error_msg("subevalvar(p:'%s',varname:'%s',strloc:%d,subtype:%d,startloc:%d,varflags:%x,quotes:%d)",
6347 // p, varname, strloc, subtype, startloc, varflags, quotes);
6350 argstr(p, (subtype != VSASSIGN && subtype != VSQUESTION) ? EXP_CASE : 0,
6352 STPUTC('\0', expdest);
6353 herefd = saveherefd;
6354 argbackq = saveargbackq;
6355 startp = (char *)stackblock() + startloc;
6359 setvar(varname, startp, 0);
6360 amount = startp - expdest;
6361 STADJUST(amount, expdest);
6365 varunset(p, varname, startp, varflags);
6368 #if ENABLE_ASH_BASH_COMPAT
6370 loc = str = stackblock() + strloc;
6371 /* Read POS in ${var:POS:LEN} */
6372 pos = atoi(loc); /* number(loc) errors out on "1:4" */
6373 len = str - startp - 1;
6375 /* *loc != '\0', guaranteed by parser */
6379 /* Adjust the length by the number of escapes */
6380 for (ptr = startp; ptr < (str - 1); ptr++) {
6381 if ((unsigned char)*ptr == CTLESC) {
6389 if (*loc++ == ':') {
6393 /* Skip POS in ${var:POS:LEN} */
6395 while (*loc && *loc != ':') {
6397 * bash complains on: var=qwe; echo ${var:1a:123}
6399 ash_msg_and_raise_error(msg_illnum, str);
6403 if (*loc++ == ':') {
6407 if (pos >= orig_len) {
6411 if (len > (orig_len - pos))
6412 len = orig_len - pos;
6414 for (str = startp; pos; str++, pos--) {
6415 if (quotes && (unsigned char)*str == CTLESC)
6418 for (loc = startp; len; len--) {
6419 if (quotes && (unsigned char)*str == CTLESC)
6424 amount = loc - expdest;
6425 STADJUST(amount, expdest);
6430 resetloc = expdest - (char *)stackblock();
6432 /* We'll comeback here if we grow the stack while handling
6433 * a VSREPLACE or VSREPLACEALL, since our pointers into the
6434 * stack will need rebasing, and we'll need to remove our work
6437 IF_ASH_BASH_COMPAT(restart:)
6439 amount = expdest - ((char *)stackblock() + resetloc);
6440 STADJUST(-amount, expdest);
6441 startp = (char *)stackblock() + startloc;
6444 rmescend = (char *)stackblock() + strloc;
6446 rmesc = rmescapes(startp, RMESCAPE_ALLOC | RMESCAPE_GROW);
6447 if (rmesc != startp) {
6449 startp = (char *)stackblock() + startloc;
6453 str = (char *)stackblock() + strloc;
6454 preglob(str, varflags & VSQUOTE, 0);
6456 #if ENABLE_ASH_BASH_COMPAT
6457 workloc = expdest - (char *)stackblock();
6458 if (subtype == VSREPLACE || subtype == VSREPLACEALL) {
6462 repl = parse_sub_pattern(str, varflags);
6463 //bb_error_msg("repl:'%s'", repl);
6468 /* If there's no pattern to match, return the expansion unmolested */
6477 loc = scanright(idx, rmesc, rmescend, str, quotes, 1);
6478 //bb_error_msg("scanright('%s'):'%s'", str, loc);
6480 /* No match, advance */
6481 char *restart_detect = stackblock();
6483 STPUTC(*idx, expdest);
6484 if (quotes && (unsigned char)*idx == CTLESC) {
6487 STPUTC(*idx, expdest);
6489 if (stackblock() != restart_detect)
6494 /* continue; - prone to quadratic behavior, smarter code: */
6497 if (str[0] == '*') {
6498 /* Pattern is "*foo". If "*foo" does not match "long_string",
6499 * it would never match "ong_string" etc, no point in trying.
6506 if (subtype == VSREPLACEALL) {
6508 if (quotes && (unsigned char)*idx == CTLESC)
6517 //bb_error_msg("repl:'%s'", repl);
6518 for (loc = (char*)repl; *loc; loc++) {
6519 char *restart_detect = stackblock();
6520 if (quotes && *loc == '\\') {
6521 STPUTC(CTLESC, expdest);
6524 STPUTC(*loc, expdest);
6525 if (stackblock() != restart_detect)
6530 if (subtype == VSREPLACE) {
6531 //bb_error_msg("tail:'%s', quotes:%x", idx, quotes);
6533 char *restart_detect = stackblock();
6534 STPUTC(*idx, expdest);
6535 if (stackblock() != restart_detect)
6544 /* We've put the replaced text into a buffer at workloc, now
6545 * move it to the right place and adjust the stack.
6547 STPUTC('\0', expdest);
6548 startp = (char *)stackblock() + startloc;
6549 memmove(startp, (char *)stackblock() + workloc, len + 1);
6550 //bb_error_msg("startp:'%s'", startp);
6551 amount = expdest - (startp + len);
6552 STADJUST(-amount, expdest);
6555 #endif /* ENABLE_ASH_BASH_COMPAT */
6557 subtype -= VSTRIMRIGHT;
6559 if (subtype < 0 || subtype > 7)
6562 /* zero = (subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX) */
6563 zero = subtype >> 1;
6564 /* VSTRIMLEFT/VSTRIMRIGHTMAX -> scanleft */
6565 scan = (subtype & 1) ^ zero ? scanleft : scanright;
6567 loc = scan(startp, rmesc, rmescend, str, quotes, zero);
6570 memmove(startp, loc, str - loc);
6571 loc = startp + (str - loc) - 1;
6574 amount = loc - expdest;
6575 STADJUST(amount, expdest);
6581 * Add the value of a specialized variable to the stack string.
6582 * name parameter (examples):
6583 * ash -c 'echo $1' name:'1='
6584 * ash -c 'echo $qwe' name:'qwe='
6585 * ash -c 'echo $$' name:'$='
6586 * ash -c 'echo ${$}' name:'$='
6587 * ash -c 'echo ${$##q}' name:'$=q'
6588 * ash -c 'echo ${#$}' name:'$='
6589 * note: examples with bad shell syntax:
6590 * ash -c 'echo ${#$1}' name:'$=1'
6591 * ash -c 'echo ${#1#}' name:'1=#'
6593 static NOINLINE ssize_t
6594 varvalue(char *name, int varflags, int flags, struct strlist *var_str_list)
6601 int subtype = varflags & VSTYPE;
6602 int quotes = flags & (EXP_FULL | EXP_CASE | EXP_REDIR);
6603 int quoted = varflags & VSQUOTE;
6604 int syntax = quoted ? DQSYNTAX : BASESYNTAX;
6614 num = shellparam.nparam;
6622 goto check_1char_name;
6624 expdest = makestrspace(NOPTS, expdest);
6625 for (i = NOPTS - 1; i >= 0; i--) {
6627 USTPUTC(optletters(i), expdest);
6633 /* handles cases similar to ${#$1} */
6634 if (name[2] != '\0')
6635 raise_error_syntax("bad substitution");
6642 if (quoted && (flags & EXP_FULL)) {
6643 /* note: this is not meant as PEOF value */
6644 sep = 1 << CHAR_BIT;
6649 sep = ifsset() ? (unsigned char)(ifsval()[0]) : ' ';
6650 i = SIT(sep, syntax);
6651 if (quotes && (i == CCTL || i == CBACK))
6657 while ((p = *ap++) != NULL) {
6660 partlen = strlen(p);
6663 if (!(subtype == VSPLUS || subtype == VSLENGTH))
6664 memtodest(p, partlen, syntax, quotes);
6670 if (subtype == VSPLUS || subtype == VSLENGTH) {
6676 /* note: may put NUL despite sep != 0
6677 * (see sep = 1 << CHAR_BIT above) */
6683 } /* case '@' and '*' */
6694 num = atoi(name); /* number(name) fails on ${N#str} etc */
6695 if (num < 0 || num > shellparam.nparam)
6697 p = num ? shellparam.p[num - 1] : arg0;
6700 /* NB: name has form "VAR=..." */
6702 /* "A=a B=$A" case: var_str_list is a list of "A=a" strings
6703 * which should be considered before we check variables. */
6705 unsigned name_len = (strchrnul(name, '=') - name) + 1;
6709 str = var_str_list->text;
6710 eq = strchr(str, '=');
6711 if (!eq) /* stop at first non-assignment */
6714 if (name_len == (unsigned)(eq - str)
6715 && strncmp(str, name, name_len) == 0
6718 /* goto value; - WRONG! */
6719 /* think "A=1 A=2 B=$A" */
6721 var_str_list = var_str_list->next;
6722 } while (var_str_list);
6726 p = lookupvar(name);
6732 if (!(subtype == VSPLUS || subtype == VSLENGTH))
6733 memtodest(p, len, syntax, quotes);
6737 if (subtype == VSPLUS || subtype == VSLENGTH)
6738 STADJUST(-len, expdest);
6743 * Expand a variable, and return a pointer to the next character in the
6747 evalvar(char *p, int flags, struct strlist *var_str_list)
6758 varflags = (unsigned char) *p++;
6759 subtype = varflags & VSTYPE;
6760 quoted = varflags & VSQUOTE;
6762 easy = (!quoted || (*var == '@' && shellparam.nparam));
6763 startloc = expdest - (char *)stackblock();
6764 p = strchr(p, '=') + 1; //TODO: use var_end(p)?
6767 varlen = varvalue(var, varflags, flags, var_str_list);
6768 if (varflags & VSNUL)
6771 if (subtype == VSPLUS) {
6772 varlen = -1 - varlen;
6776 if (subtype == VSMINUS) {
6781 flags | (quoted ? EXP_TILDE|EXP_QWORD : EXP_TILDE|EXP_WORD),
6791 if (subtype == VSASSIGN || subtype == VSQUESTION) {
6793 if (subevalvar(p, var, /* strloc: */ 0,
6794 subtype, startloc, varflags,
6800 * Remove any recorded regions beyond
6803 removerecordregions(startloc);
6813 if (varlen < 0 && uflag)
6814 varunset(p, var, 0, 0);
6816 if (subtype == VSLENGTH) {
6817 cvtnum(varlen > 0 ? varlen : 0);
6821 if (subtype == VSNORMAL) {
6832 case VSTRIMRIGHTMAX:
6833 #if ENABLE_ASH_BASH_COMPAT
6846 * Terminate the string and start recording the pattern
6849 STPUTC('\0', expdest);
6850 patloc = expdest - (char *)stackblock();
6851 if (NULL == subevalvar(p, /* varname: */ NULL, patloc, subtype,
6853 /* quotes: */ flags & (EXP_FULL | EXP_CASE | EXP_REDIR),
6856 int amount = expdest - (
6857 (char *)stackblock() + patloc - 1
6859 STADJUST(-amount, expdest);
6861 /* Remove any recorded regions beyond start of variable */
6862 removerecordregions(startloc);
6864 recordregion(startloc, expdest - (char *)stackblock(), quoted);
6868 if (subtype != VSNORMAL) { /* skip to end of alternative */
6871 unsigned char c = *p++;
6874 else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) {
6876 argbackq = argbackq->next;
6877 } else if (c == CTLVAR) {
6878 if ((*p++ & VSTYPE) != VSNORMAL)
6880 } else if (c == CTLENDVAR) {
6890 * Break the argument string into pieces based upon IFS and add the
6891 * strings to the argument list. The regions of the string to be
6892 * searched for IFS characters have been stored by recordregion.
6895 ifsbreakup(char *string, struct arglist *arglist)
6897 struct ifsregion *ifsp;
6902 const char *ifs, *realifs;
6907 if (ifslastp != NULL) {
6910 realifs = ifsset() ? ifsval() : defifs;
6913 p = string + ifsp->begoff;
6914 nulonly = ifsp->nulonly;
6915 ifs = nulonly ? nullstr : realifs;
6917 while (p < string + ifsp->endoff) {
6919 if ((unsigned char)*p == CTLESC)
6921 if (!strchr(ifs, *p)) {
6926 ifsspc = (strchr(defifs, *p) != NULL);
6927 /* Ignore IFS whitespace at start */
6928 if (q == start && ifsspc) {
6934 sp = stzalloc(sizeof(*sp));
6936 *arglist->lastp = sp;
6937 arglist->lastp = &sp->next;
6941 if (p >= string + ifsp->endoff) {
6945 if ((unsigned char)*p == CTLESC)
6947 if (strchr(ifs, *p) == NULL) {
6951 if (strchr(defifs, *p) == NULL) {
6966 } while (ifsp != NULL);
6975 sp = stzalloc(sizeof(*sp));
6977 *arglist->lastp = sp;
6978 arglist->lastp = &sp->next;
6984 struct ifsregion *p;
6989 struct ifsregion *ifsp;
6995 ifsfirst.next = NULL;
7000 * Add a file name to the list.
7003 addfname(const char *name)
7007 sp = stzalloc(sizeof(*sp));
7008 sp->text = ststrdup(name);
7010 exparg.lastp = &sp->next;
7014 * Do metacharacter (i.e. *, ?, [...]) expansion.
7017 expmeta(char *expdir, char *enddir, char *name)
7032 for (p = name; *p; p++) {
7033 if (*p == '*' || *p == '?')
7035 else if (*p == '[') {
7042 if (*q == '/' || *q == '\0')
7049 } else if (*p == '\\')
7051 else if (*p == '/') {
7058 if (metaflag == 0) { /* we've reached the end of the file name */
7059 if (enddir != expdir)
7067 if (metaflag == 0 || lstat(expdir, &statb) >= 0)
7078 } while (p < start);
7080 if (enddir == expdir) {
7082 } else if (enddir == expdir + 1 && *expdir == '/') {
7091 if (enddir != expdir)
7093 if (*endname == 0) {
7105 while (!pending_int && (dp = readdir(dirp)) != NULL) {
7106 if (dp->d_name[0] == '.' && !matchdot)
7108 if (pmatch(start, dp->d_name)) {
7110 strcpy(enddir, dp->d_name);
7113 for (p = enddir, cp = dp->d_name; (*p++ = *cp++) != '\0';)
7116 expmeta(expdir, p, endname);
7125 static struct strlist *
7126 msort(struct strlist *list, int len)
7128 struct strlist *p, *q = NULL;
7129 struct strlist **lpp;
7137 for (n = half; --n >= 0;) {
7141 q->next = NULL; /* terminate first half of list */
7142 q = msort(list, half); /* sort first half of list */
7143 p = msort(p, len - half); /* sort second half */
7146 #if ENABLE_LOCALE_SUPPORT
7147 if (strcoll(p->text, q->text) < 0)
7149 if (strcmp(p->text, q->text) < 0)
7173 * Sort the results of file name expansion. It calculates the number of
7174 * strings to sort and then calls msort (short for merge sort) to do the
7177 static struct strlist *
7178 expsort(struct strlist *str)
7184 for (sp = str; sp; sp = sp->next)
7186 return msort(str, len);
7190 expandmeta(struct strlist *str /*, int flag*/)
7192 static const char metachars[] ALIGN1 = {
7195 /* TODO - EXP_REDIR */
7199 struct strlist **savelastp;
7205 if (!strpbrk(str->text, metachars))
7207 savelastp = exparg.lastp;
7210 p = preglob(str->text, 0, RMESCAPE_ALLOC | RMESCAPE_HEAP);
7212 int i = strlen(str->text);
7213 expdir = ckmalloc(i < 2048 ? 2048 : i); /* XXX */
7215 expmeta(expdir, expdir, p);
7220 if (exparg.lastp == savelastp) {
7225 *exparg.lastp = str;
7226 rmescapes(str->text, 0);
7227 exparg.lastp = &str->next;
7229 *exparg.lastp = NULL;
7230 *savelastp = sp = expsort(*savelastp);
7231 while (sp->next != NULL)
7233 exparg.lastp = &sp->next;
7240 * Perform variable substitution and command substitution on an argument,
7241 * placing the resulting list of arguments in arglist. If EXP_FULL is true,
7242 * perform splitting and file name expansion. When arglist is NULL, perform
7243 * here document expansion.
7246 expandarg(union node *arg, struct arglist *arglist, int flag)
7251 argbackq = arg->narg.backquote;
7252 STARTSTACKSTR(expdest);
7253 ifsfirst.next = NULL;
7255 TRACE(("expandarg: argstr('%s',flags:%x)\n", arg->narg.text, flag));
7256 argstr(arg->narg.text, flag,
7257 /* var_str_list: */ arglist ? arglist->list : NULL);
7258 p = _STPUTC('\0', expdest);
7260 if (arglist == NULL) {
7261 return; /* here document expanded */
7263 p = grabstackstr(p);
7264 TRACE(("expandarg: p:'%s'\n", p));
7265 exparg.lastp = &exparg.list;
7269 if (flag & EXP_FULL) {
7270 ifsbreakup(p, &exparg);
7271 *exparg.lastp = NULL;
7272 exparg.lastp = &exparg.list;
7273 expandmeta(exparg.list /*, flag*/);
7275 if (flag & EXP_REDIR) { /*XXX - for now, just remove escapes */
7277 TRACE(("expandarg: rmescapes:'%s'\n", p));
7279 sp = stzalloc(sizeof(*sp));
7282 exparg.lastp = &sp->next;
7286 *exparg.lastp = NULL;
7288 *arglist->lastp = exparg.list;
7289 arglist->lastp = exparg.lastp;
7294 * Expand shell variables and backquotes inside a here document.
7297 expandhere(union node *arg, int fd)
7300 expandarg(arg, (struct arglist *)NULL, 0);
7301 full_write(fd, stackblock(), expdest - (char *)stackblock());
7305 * Returns true if the pattern matches the string.
7308 patmatch(char *pattern, const char *string)
7310 return pmatch(preglob(pattern, 0, 0), string);
7314 * See if a pattern matches in a case statement.
7317 casematch(union node *pattern, char *val)
7319 struct stackmark smark;
7322 setstackmark(&smark);
7323 argbackq = pattern->narg.backquote;
7324 STARTSTACKSTR(expdest);
7326 argstr(pattern->narg.text, EXP_TILDE | EXP_CASE,
7327 /* var_str_list: */ NULL);
7328 STACKSTRNUL(expdest);
7329 result = patmatch(stackblock(), val);
7330 popstackmark(&smark);
7335 /* ============ find_command */
7339 int (*builtin)(int, char **) FAST_FUNC;
7340 /* unsigned flags; */
7342 #define IS_BUILTIN_SPECIAL(b) ((b)->name[0] & 1)
7343 /* "regular" builtins always take precedence over commands,
7344 * regardless of PATH=....%builtin... position */
7345 #define IS_BUILTIN_REGULAR(b) ((b)->name[0] & 2)
7346 #define IS_BUILTIN_ASSIGN(b) ((b)->name[0] & 4)
7349 smallint cmdtype; /* CMDxxx */
7352 /* index >= 0 for commands without path (slashes) */
7353 /* (TODO: what exactly does the value mean? PATH position?) */
7354 /* index == -1 for commands with slashes */
7355 /* index == (-2 - applet_no) for NOFORK applets */
7356 const struct builtincmd *cmd;
7357 struct funcnode *func;
7360 /* values of cmdtype */
7361 #define CMDUNKNOWN -1 /* no entry in table for command */
7362 #define CMDNORMAL 0 /* command is an executable program */
7363 #define CMDFUNCTION 1 /* command is a shell function */
7364 #define CMDBUILTIN 2 /* command is a shell builtin */
7366 /* action to find_command() */
7367 #define DO_ERR 0x01 /* prints errors */
7368 #define DO_ABS 0x02 /* checks absolute paths */
7369 #define DO_NOFUNC 0x04 /* don't return shell functions, for command */
7370 #define DO_ALTPATH 0x08 /* using alternate path */
7371 #define DO_ALTBLTIN 0x20 /* %builtin in alt. path */
7373 static void find_command(char *, struct cmdentry *, int, const char *);
7376 /* ============ Hashing commands */
7379 * When commands are first encountered, they are entered in a hash table.
7380 * This ensures that a full path search will not have to be done for them
7381 * on each invocation.
7383 * We should investigate converting to a linear search, even though that
7384 * would make the command name "hash" a misnomer.
7388 struct tblentry *next; /* next entry in hash chain */
7389 union param param; /* definition of builtin function */
7390 smallint cmdtype; /* CMDxxx */
7391 char rehash; /* if set, cd done since entry created */
7392 char cmdname[1]; /* name of command */
7395 static struct tblentry **cmdtable;
7396 #define INIT_G_cmdtable() do { \
7397 cmdtable = xzalloc(CMDTABLESIZE * sizeof(cmdtable[0])); \
7400 static int builtinloc = -1; /* index in path of %builtin, or -1 */
7404 tryexec(IF_FEATURE_SH_STANDALONE(int applet_no,) char *cmd, char **argv, char **envp)
7406 #if ENABLE_FEATURE_SH_STANDALONE
7407 if (applet_no >= 0) {
7408 if (APPLET_IS_NOEXEC(applet_no)) {
7412 run_applet_no_and_exit(applet_no, argv);
7414 /* re-exec ourselves with the new arguments */
7415 execve(bb_busybox_exec_path, argv, envp);
7416 /* If they called chroot or otherwise made the binary no longer
7417 * executable, fall through */
7424 execve(cmd, argv, envp);
7425 } while (errno == EINTR);
7427 execve(cmd, argv, envp);
7429 if (cmd == (char*) bb_busybox_exec_path) {
7430 /* We already visited ENOEXEC branch below, don't do it again */
7431 //TODO: try execve(initial_argv0_of_shell, argv, envp) before giving up?
7435 if (errno == ENOEXEC) {
7436 /* Run "cmd" as a shell script:
7437 * http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html
7438 * "If the execve() function fails with ENOEXEC, the shell
7439 * shall execute a command equivalent to having a shell invoked
7440 * with the command name as its first operand,
7441 * with any remaining arguments passed to the new shell"
7443 * That is, do not use $SHELL, user's shell, or /bin/sh;
7444 * just call ourselves.
7446 * Note that bash reads ~80 chars of the file, and if it sees
7447 * a zero byte before it sees newline, it doesn't try to
7448 * interpret it, but fails with "cannot execute binary file"
7449 * message and exit code 126. For one, this prevents attempts
7450 * to interpret foreign ELF binaries as shell scripts.
7455 for (ap = argv; *ap; ap++)
7457 new = ckmalloc((ap - argv + 2) * sizeof(new[0]));
7458 new[0] = (char*) "ash";
7461 while ((*ap++ = *++argv) != NULL)
7463 cmd = (char*) bb_busybox_exec_path;
7470 * Exec a program. Never returns. If you change this routine, you may
7471 * have to change the find_command routine as well.
7473 static void shellexec(char **, const char *, int) NORETURN;
7475 shellexec(char **argv, const char *path, int idx)
7481 int applet_no = -1; /* used only by FEATURE_SH_STANDALONE */
7483 clearredir(/*drop:*/ 1);
7484 envp = listvars(VEXPORT, VUNSET, /*end:*/ NULL);
7485 if (strchr(argv[0], '/') != NULL
7486 #if ENABLE_FEATURE_SH_STANDALONE
7487 || (applet_no = find_applet_by_name(argv[0])) >= 0
7490 tryexec(IF_FEATURE_SH_STANDALONE(applet_no,) argv[0], argv, envp);
7491 if (applet_no >= 0) {
7492 /* We tried execing ourself, but it didn't work.
7493 * Maybe /proc/self/exe doesn't exist?
7502 while ((cmdname = path_advance(&path, argv[0])) != NULL) {
7503 if (--idx < 0 && pathopt == NULL) {
7504 tryexec(IF_FEATURE_SH_STANDALONE(-1,) cmdname, argv, envp);
7505 if (errno != ENOENT && errno != ENOTDIR)
7512 /* Map to POSIX errors */
7524 exitstatus = exerrno;
7525 TRACE(("shellexec failed for %s, errno %d, suppress_int %d\n",
7526 argv[0], e, suppress_int));
7527 ash_msg_and_raise(EXEXEC, "%s: %s", argv[0], errmsg(e, "not found"));
7532 printentry(struct tblentry *cmdp)
7538 idx = cmdp->param.index;
7541 name = path_advance(&path, cmdp->cmdname);
7543 } while (--idx >= 0);
7544 out1fmt("%s%s\n", name, (cmdp->rehash ? "*" : nullstr));
7548 * Clear out command entries. The argument specifies the first entry in
7549 * PATH which has changed.
7552 clearcmdentry(int firstchange)
7554 struct tblentry **tblp;
7555 struct tblentry **pp;
7556 struct tblentry *cmdp;
7559 for (tblp = cmdtable; tblp < &cmdtable[CMDTABLESIZE]; tblp++) {
7561 while ((cmdp = *pp) != NULL) {
7562 if ((cmdp->cmdtype == CMDNORMAL &&
7563 cmdp->param.index >= firstchange)
7564 || (cmdp->cmdtype == CMDBUILTIN &&
7565 builtinloc >= firstchange)
7578 * Locate a command in the command hash table. If "add" is nonzero,
7579 * add the command to the table if it is not already present. The
7580 * variable "lastcmdentry" is set to point to the address of the link
7581 * pointing to the entry, so that delete_cmd_entry can delete the
7584 * Interrupts must be off if called with add != 0.
7586 static struct tblentry **lastcmdentry;
7588 static struct tblentry *
7589 cmdlookup(const char *name, int add)
7591 unsigned int hashval;
7593 struct tblentry *cmdp;
7594 struct tblentry **pp;
7597 hashval = (unsigned char)*p << 4;
7599 hashval += (unsigned char)*p++;
7601 pp = &cmdtable[hashval % CMDTABLESIZE];
7602 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7603 if (strcmp(cmdp->cmdname, name) == 0)
7607 if (add && cmdp == NULL) {
7608 cmdp = *pp = ckzalloc(sizeof(struct tblentry)
7610 /* + 1 - already done because
7611 * tblentry::cmdname is char[1] */);
7612 /*cmdp->next = NULL; - ckzalloc did it */
7613 cmdp->cmdtype = CMDUNKNOWN;
7614 strcpy(cmdp->cmdname, name);
7621 * Delete the command entry returned on the last lookup.
7624 delete_cmd_entry(void)
7626 struct tblentry *cmdp;
7629 cmdp = *lastcmdentry;
7630 *lastcmdentry = cmdp->next;
7631 if (cmdp->cmdtype == CMDFUNCTION)
7632 freefunc(cmdp->param.func);
7638 * Add a new command entry, replacing any existing command entry for
7639 * the same name - except special builtins.
7642 addcmdentry(char *name, struct cmdentry *entry)
7644 struct tblentry *cmdp;
7646 cmdp = cmdlookup(name, 1);
7647 if (cmdp->cmdtype == CMDFUNCTION) {
7648 freefunc(cmdp->param.func);
7650 cmdp->cmdtype = entry->cmdtype;
7651 cmdp->param = entry->u;
7655 static int FAST_FUNC
7656 hashcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
7658 struct tblentry **pp;
7659 struct tblentry *cmdp;
7661 struct cmdentry entry;
7664 if (nextopt("r") != '\0') {
7669 if (*argptr == NULL) {
7670 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
7671 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7672 if (cmdp->cmdtype == CMDNORMAL)
7680 while ((name = *argptr) != NULL) {
7681 cmdp = cmdlookup(name, 0);
7683 && (cmdp->cmdtype == CMDNORMAL
7684 || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))
7688 find_command(name, &entry, DO_ERR, pathval());
7689 if (entry.cmdtype == CMDUNKNOWN)
7697 * Called when a cd is done. Marks all commands so the next time they
7698 * are executed they will be rehashed.
7703 struct tblentry **pp;
7704 struct tblentry *cmdp;
7706 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
7707 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7708 if (cmdp->cmdtype == CMDNORMAL
7709 || (cmdp->cmdtype == CMDBUILTIN
7710 && !IS_BUILTIN_REGULAR(cmdp->param.cmd)
7720 * Fix command hash table when PATH changed.
7721 * Called before PATH is changed. The argument is the new value of PATH;
7722 * pathval() still returns the old value at this point.
7723 * Called with interrupts off.
7725 static void FAST_FUNC
7726 changepath(const char *new)
7734 firstchange = 9999; /* assume no change */
7740 if ((*old == '\0' && *new == ':')
7741 || (*old == ':' && *new == '\0')
7745 old = new; /* ignore subsequent differences */
7749 if (*new == '%' && idx_bltin < 0 && prefix(new + 1, "builtin"))
7756 if (builtinloc < 0 && idx_bltin >= 0)
7757 builtinloc = idx_bltin; /* zap builtins */
7758 if (builtinloc >= 0 && idx_bltin < 0)
7760 clearcmdentry(firstchange);
7761 builtinloc = idx_bltin;
7776 #define TENDBQUOTE 12
7793 typedef smallint token_id_t;
7795 /* first char is indicating which tokens mark the end of a list */
7796 static const char *const tokname_array[] = {
7810 #define KWDOFFSET 13
7811 /* the following are keywords */
7830 /* Wrapper around strcmp for qsort/bsearch/... */
7832 pstrcmp(const void *a, const void *b)
7834 return strcmp((char*) a, (*(char**) b) + 1);
7837 static const char *const *
7838 findkwd(const char *s)
7840 return bsearch(s, tokname_array + KWDOFFSET,
7841 ARRAY_SIZE(tokname_array) - KWDOFFSET,
7842 sizeof(tokname_array[0]), pstrcmp);
7846 * Locate and print what a word is...
7849 describe_command(char *command, int describe_command_verbose)
7851 struct cmdentry entry;
7852 struct tblentry *cmdp;
7853 #if ENABLE_ASH_ALIAS
7854 const struct alias *ap;
7856 const char *path = pathval();
7858 if (describe_command_verbose) {
7862 /* First look at the keywords */
7863 if (findkwd(command)) {
7864 out1str(describe_command_verbose ? " is a shell keyword" : command);
7868 #if ENABLE_ASH_ALIAS
7869 /* Then look at the aliases */
7870 ap = lookupalias(command, 0);
7872 if (!describe_command_verbose) {
7877 out1fmt(" is an alias for %s", ap->val);
7881 /* Then check if it is a tracked alias */
7882 cmdp = cmdlookup(command, 0);
7884 entry.cmdtype = cmdp->cmdtype;
7885 entry.u = cmdp->param;
7887 /* Finally use brute force */
7888 find_command(command, &entry, DO_ABS, path);
7891 switch (entry.cmdtype) {
7893 int j = entry.u.index;
7899 p = path_advance(&path, command);
7903 if (describe_command_verbose) {
7905 (cmdp ? " a tracked alias for" : nullstr), p
7914 if (describe_command_verbose) {
7915 out1str(" is a shell function");
7922 if (describe_command_verbose) {
7923 out1fmt(" is a %sshell builtin",
7924 IS_BUILTIN_SPECIAL(entry.u.cmd) ?
7925 "special " : nullstr
7933 if (describe_command_verbose) {
7934 out1str(": not found\n");
7943 static int FAST_FUNC
7944 typecmd(int argc UNUSED_PARAM, char **argv)
7950 /* type -p ... ? (we don't bother checking for 'p') */
7951 if (argv[1] && argv[1][0] == '-') {
7956 err |= describe_command(argv[i++], verbose);
7961 #if ENABLE_ASH_CMDCMD
7962 static int FAST_FUNC
7963 commandcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
7971 while ((c = nextopt("pvV")) != '\0')
7973 verify |= VERIFY_VERBOSE;
7975 verify |= VERIFY_BRIEF;
7980 /* Mimic bash: just "command -v" doesn't complain, it's a nop */
7981 if (verify && (*argptr != NULL)) {
7982 return describe_command(*argptr, verify - VERIFY_BRIEF);
7990 /* ============ eval.c */
7992 static int funcblocksize; /* size of structures in function */
7993 static int funcstringsize; /* size of strings in node */
7994 static void *funcblock; /* block to allocate function from */
7995 static char *funcstring; /* block to allocate strings from */
7997 /* flags in argument to evaltree */
7998 #define EV_EXIT 01 /* exit after evaluating tree */
7999 #define EV_TESTED 02 /* exit status is checked; ignore -e flag */
8000 #define EV_BACKCMD 04 /* command executing within back quotes */
8002 static const uint8_t nodesize[N_NUMBER] = {
8003 [NCMD ] = SHELL_ALIGN(sizeof(struct ncmd)),
8004 [NPIPE ] = SHELL_ALIGN(sizeof(struct npipe)),
8005 [NREDIR ] = SHELL_ALIGN(sizeof(struct nredir)),
8006 [NBACKGND ] = SHELL_ALIGN(sizeof(struct nredir)),
8007 [NSUBSHELL] = SHELL_ALIGN(sizeof(struct nredir)),
8008 [NAND ] = SHELL_ALIGN(sizeof(struct nbinary)),
8009 [NOR ] = SHELL_ALIGN(sizeof(struct nbinary)),
8010 [NSEMI ] = SHELL_ALIGN(sizeof(struct nbinary)),
8011 [NIF ] = SHELL_ALIGN(sizeof(struct nif)),
8012 [NWHILE ] = SHELL_ALIGN(sizeof(struct nbinary)),
8013 [NUNTIL ] = SHELL_ALIGN(sizeof(struct nbinary)),
8014 [NFOR ] = SHELL_ALIGN(sizeof(struct nfor)),
8015 [NCASE ] = SHELL_ALIGN(sizeof(struct ncase)),
8016 [NCLIST ] = SHELL_ALIGN(sizeof(struct nclist)),
8017 [NDEFUN ] = SHELL_ALIGN(sizeof(struct narg)),
8018 [NARG ] = SHELL_ALIGN(sizeof(struct narg)),
8019 [NTO ] = SHELL_ALIGN(sizeof(struct nfile)),
8020 #if ENABLE_ASH_BASH_COMPAT
8021 [NTO2 ] = SHELL_ALIGN(sizeof(struct nfile)),
8023 [NCLOBBER ] = SHELL_ALIGN(sizeof(struct nfile)),
8024 [NFROM ] = SHELL_ALIGN(sizeof(struct nfile)),
8025 [NFROMTO ] = SHELL_ALIGN(sizeof(struct nfile)),
8026 [NAPPEND ] = SHELL_ALIGN(sizeof(struct nfile)),
8027 [NTOFD ] = SHELL_ALIGN(sizeof(struct ndup)),
8028 [NFROMFD ] = SHELL_ALIGN(sizeof(struct ndup)),
8029 [NHERE ] = SHELL_ALIGN(sizeof(struct nhere)),
8030 [NXHERE ] = SHELL_ALIGN(sizeof(struct nhere)),
8031 [NNOT ] = SHELL_ALIGN(sizeof(struct nnot)),
8034 static void calcsize(union node *n);
8037 sizenodelist(struct nodelist *lp)
8040 funcblocksize += SHELL_ALIGN(sizeof(struct nodelist));
8047 calcsize(union node *n)
8051 funcblocksize += nodesize[n->type];
8054 calcsize(n->ncmd.redirect);
8055 calcsize(n->ncmd.args);
8056 calcsize(n->ncmd.assign);
8059 sizenodelist(n->npipe.cmdlist);
8064 calcsize(n->nredir.redirect);
8065 calcsize(n->nredir.n);
8072 calcsize(n->nbinary.ch2);
8073 calcsize(n->nbinary.ch1);
8076 calcsize(n->nif.elsepart);
8077 calcsize(n->nif.ifpart);
8078 calcsize(n->nif.test);
8081 funcstringsize += strlen(n->nfor.var) + 1;
8082 calcsize(n->nfor.body);
8083 calcsize(n->nfor.args);
8086 calcsize(n->ncase.cases);
8087 calcsize(n->ncase.expr);
8090 calcsize(n->nclist.body);
8091 calcsize(n->nclist.pattern);
8092 calcsize(n->nclist.next);
8096 sizenodelist(n->narg.backquote);
8097 funcstringsize += strlen(n->narg.text) + 1;
8098 calcsize(n->narg.next);
8101 #if ENABLE_ASH_BASH_COMPAT
8108 calcsize(n->nfile.fname);
8109 calcsize(n->nfile.next);
8113 calcsize(n->ndup.vname);
8114 calcsize(n->ndup.next);
8118 calcsize(n->nhere.doc);
8119 calcsize(n->nhere.next);
8122 calcsize(n->nnot.com);
8128 nodeckstrdup(char *s)
8130 char *rtn = funcstring;
8132 strcpy(funcstring, s);
8133 funcstring += strlen(s) + 1;
8137 static union node *copynode(union node *);
8139 static struct nodelist *
8140 copynodelist(struct nodelist *lp)
8142 struct nodelist *start;
8143 struct nodelist **lpp;
8148 funcblock = (char *) funcblock + SHELL_ALIGN(sizeof(struct nodelist));
8149 (*lpp)->n = copynode(lp->n);
8151 lpp = &(*lpp)->next;
8158 copynode(union node *n)
8165 funcblock = (char *) funcblock + nodesize[n->type];
8169 new->ncmd.redirect = copynode(n->ncmd.redirect);
8170 new->ncmd.args = copynode(n->ncmd.args);
8171 new->ncmd.assign = copynode(n->ncmd.assign);
8174 new->npipe.cmdlist = copynodelist(n->npipe.cmdlist);
8175 new->npipe.pipe_backgnd = n->npipe.pipe_backgnd;
8180 new->nredir.redirect = copynode(n->nredir.redirect);
8181 new->nredir.n = copynode(n->nredir.n);
8188 new->nbinary.ch2 = copynode(n->nbinary.ch2);
8189 new->nbinary.ch1 = copynode(n->nbinary.ch1);
8192 new->nif.elsepart = copynode(n->nif.elsepart);
8193 new->nif.ifpart = copynode(n->nif.ifpart);
8194 new->nif.test = copynode(n->nif.test);
8197 new->nfor.var = nodeckstrdup(n->nfor.var);
8198 new->nfor.body = copynode(n->nfor.body);
8199 new->nfor.args = copynode(n->nfor.args);
8202 new->ncase.cases = copynode(n->ncase.cases);
8203 new->ncase.expr = copynode(n->ncase.expr);
8206 new->nclist.body = copynode(n->nclist.body);
8207 new->nclist.pattern = copynode(n->nclist.pattern);
8208 new->nclist.next = copynode(n->nclist.next);
8212 new->narg.backquote = copynodelist(n->narg.backquote);
8213 new->narg.text = nodeckstrdup(n->narg.text);
8214 new->narg.next = copynode(n->narg.next);
8217 #if ENABLE_ASH_BASH_COMPAT
8224 new->nfile.fname = copynode(n->nfile.fname);
8225 new->nfile.fd = n->nfile.fd;
8226 new->nfile.next = copynode(n->nfile.next);
8230 new->ndup.vname = copynode(n->ndup.vname);
8231 new->ndup.dupfd = n->ndup.dupfd;
8232 new->ndup.fd = n->ndup.fd;
8233 new->ndup.next = copynode(n->ndup.next);
8237 new->nhere.doc = copynode(n->nhere.doc);
8238 new->nhere.fd = n->nhere.fd;
8239 new->nhere.next = copynode(n->nhere.next);
8242 new->nnot.com = copynode(n->nnot.com);
8245 new->type = n->type;
8250 * Make a copy of a parse tree.
8252 static struct funcnode *
8253 copyfunc(union node *n)
8258 funcblocksize = offsetof(struct funcnode, n);
8261 blocksize = funcblocksize;
8262 f = ckmalloc(blocksize + funcstringsize);
8263 funcblock = (char *) f + offsetof(struct funcnode, n);
8264 funcstring = (char *) f + blocksize;
8271 * Define a shell function.
8274 defun(char *name, union node *func)
8276 struct cmdentry entry;
8279 entry.cmdtype = CMDFUNCTION;
8280 entry.u.func = copyfunc(func);
8281 addcmdentry(name, &entry);
8285 /* Reasons for skipping commands (see comment on breakcmd routine) */
8286 #define SKIPBREAK (1 << 0)
8287 #define SKIPCONT (1 << 1)
8288 #define SKIPFUNC (1 << 2)
8289 #define SKIPFILE (1 << 3)
8290 #define SKIPEVAL (1 << 4)
8291 static smallint evalskip; /* set to SKIPxxx if we are skipping commands */
8292 static int skipcount; /* number of levels to skip */
8293 static int funcnest; /* depth of function calls */
8294 static int loopnest; /* current loop nesting level */
8296 /* Forward decl way out to parsing code - dotrap needs it */
8297 static int evalstring(char *s, int mask);
8299 /* Called to execute a trap.
8300 * Single callsite - at the end of evaltree().
8301 * If we return non-zero, evaltree raises EXEXIT exception.
8303 * Perhaps we should avoid entering new trap handlers
8304 * while we are executing a trap handler. [is it a TODO?]
8313 savestatus = exitstatus;
8317 TRACE(("dotrap entered\n"));
8318 for (sig = 1, g = gotsig; sig < NSIG; sig++, g++) {
8325 /* non-trapped SIGINT is handled separately by raise_interrupt,
8326 * don't upset it by resetting gotsig[SIGINT-1] */
8327 if (sig == SIGINT && !t)
8330 TRACE(("sig %d is active, will run handler '%s'\n", sig, t));
8334 want_exexit = evalstring(t, SKIPEVAL);
8335 exitstatus = savestatus;
8337 TRACE(("dotrap returns %d\n", want_exexit));
8342 TRACE(("dotrap returns 0\n"));
8346 /* forward declarations - evaluation is fairly recursive business... */
8347 static void evalloop(union node *, int);
8348 static void evalfor(union node *, int);
8349 static void evalcase(union node *, int);
8350 static void evalsubshell(union node *, int);
8351 static void expredir(union node *);
8352 static void evalpipe(union node *, int);
8353 static void evalcommand(union node *, int);
8354 static int evalbltin(const struct builtincmd *, int, char **);
8355 static void prehash(union node *);
8358 * Evaluate a parse tree. The value is left in the global variable
8362 evaltree(union node *n, int flags)
8364 struct jmploc *volatile savehandler = exception_handler;
8365 struct jmploc jmploc;
8367 void (*evalfn)(union node *, int);
8371 SAVE_INT(int_level);
8374 TRACE(("evaltree(NULL) called\n"));
8377 TRACE(("evaltree(%p: %d, %d) called\n", n, n->type, flags));
8379 exception_handler = &jmploc;
8381 int err = setjmp(jmploc.loc);
8383 /* if it was a signal, check for trap handlers */
8384 if (exception_type == EXSIG) {
8385 TRACE(("exception %d (EXSIG) in evaltree, err=%d\n",
8386 exception_type, err));
8389 /* continue on the way out */
8390 TRACE(("exception %d in evaltree, propagating err=%d\n",
8391 exception_type, err));
8392 exception_handler = savehandler;
8393 longjmp(exception_handler->loc, err);
8400 out1fmt("Node type = %d\n", n->type);
8405 evaltree(n->nnot.com, EV_TESTED);
8406 status = !exitstatus;
8409 expredir(n->nredir.redirect);
8410 status = redirectsafe(n->nredir.redirect, REDIR_PUSH);
8412 evaltree(n->nredir.n, flags & EV_TESTED);
8413 status = exitstatus;
8415 popredir(/*drop:*/ 0, /*restore:*/ 0 /* not sure */);
8418 evalfn = evalcommand;
8420 if (eflag && !(flags & EV_TESTED))
8432 evalfn = evalsubshell;
8445 #error NAND + 1 != NOR
8447 #if NOR + 1 != NSEMI
8448 #error NOR + 1 != NSEMI
8450 unsigned is_or = n->type - NAND;
8453 (flags | ((is_or >> 1) - 1)) & EV_TESTED
8455 if (!exitstatus == is_or)
8468 evaltree(n->nif.test, EV_TESTED);
8471 if (exitstatus == 0) {
8475 if (n->nif.elsepart) {
8476 n = n->nif.elsepart;
8481 defun(n->narg.text, n->narg.next);
8485 exitstatus = status;
8490 exception_handler = savehandler;
8493 /* Order of checks below is important:
8494 * signal handlers trigger before exit caused by "set -e".
8496 if (pending_sig && dotrap())
8498 if (checkexit & exitstatus)
8499 evalskip |= SKIPEVAL;
8501 if (flags & EV_EXIT) {
8503 raise_exception(EXEXIT);
8506 RESTORE_INT(int_level);
8507 TRACE(("leaving evaltree (no interrupts)\n"));
8510 #if !defined(__alpha__) || (defined(__GNUC__) && __GNUC__ >= 3)
8513 void evaltreenr(union node *, int) __attribute__ ((alias("evaltree"),__noreturn__));
8516 evalloop(union node *n, int flags)
8526 evaltree(n->nbinary.ch1, EV_TESTED);
8529 if (evalskip == SKIPCONT && --skipcount <= 0) {
8533 if (evalskip == SKIPBREAK && --skipcount <= 0)
8538 if (n->type != NWHILE)
8542 evaltree(n->nbinary.ch2, flags);
8543 status = exitstatus;
8548 exitstatus = status;
8552 evalfor(union node *n, int flags)
8554 struct arglist arglist;
8557 struct stackmark smark;
8559 setstackmark(&smark);
8560 arglist.list = NULL;
8561 arglist.lastp = &arglist.list;
8562 for (argp = n->nfor.args; argp; argp = argp->narg.next) {
8563 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE | EXP_RECORD);
8568 *arglist.lastp = NULL;
8573 for (sp = arglist.list; sp; sp = sp->next) {
8574 setvar(n->nfor.var, sp->text, 0);
8575 evaltree(n->nfor.body, flags);
8577 if (evalskip == SKIPCONT && --skipcount <= 0) {
8581 if (evalskip == SKIPBREAK && --skipcount <= 0)
8588 popstackmark(&smark);
8592 evalcase(union node *n, int flags)
8596 struct arglist arglist;
8597 struct stackmark smark;
8599 setstackmark(&smark);
8600 arglist.list = NULL;
8601 arglist.lastp = &arglist.list;
8602 expandarg(n->ncase.expr, &arglist, EXP_TILDE);
8604 for (cp = n->ncase.cases; cp && evalskip == 0; cp = cp->nclist.next) {
8605 for (patp = cp->nclist.pattern; patp; patp = patp->narg.next) {
8606 if (casematch(patp, arglist.list->text)) {
8607 if (evalskip == 0) {
8608 evaltree(cp->nclist.body, flags);
8615 popstackmark(&smark);
8619 * Kick off a subshell to evaluate a tree.
8622 evalsubshell(union node *n, int flags)
8625 int backgnd = (n->type == NBACKGND);
8628 expredir(n->nredir.redirect);
8629 if (!backgnd && (flags & EV_EXIT) && !may_have_traps)
8632 jp = makejob(/*n,*/ 1);
8633 if (forkshell(jp, n, backgnd) == 0) {
8638 flags &= ~EV_TESTED;
8640 redirect(n->nredir.redirect, 0);
8641 evaltreenr(n->nredir.n, flags);
8646 status = waitforjob(jp);
8647 exitstatus = status;
8652 * Compute the names of the files in a redirection list.
8654 static void fixredir(union node *, const char *, int);
8656 expredir(union node *n)
8660 for (redir = n; redir; redir = redir->nfile.next) {
8664 fn.lastp = &fn.list;
8665 switch (redir->type) {
8669 #if ENABLE_ASH_BASH_COMPAT
8674 expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR);
8675 TRACE(("expredir expanded to '%s'\n", fn.list->text));
8676 #if ENABLE_ASH_BASH_COMPAT
8679 redir->nfile.expfname = fn.list->text;
8682 case NTOFD: /* >& */
8683 if (redir->ndup.vname) {
8684 expandarg(redir->ndup.vname, &fn, EXP_FULL | EXP_TILDE);
8685 if (fn.list == NULL)
8686 ash_msg_and_raise_error("redir error");
8687 #if ENABLE_ASH_BASH_COMPAT
8688 //FIXME: we used expandarg with different args!
8689 if (!isdigit_str9(fn.list->text)) {
8690 /* >&file, not >&fd */
8691 if (redir->nfile.fd != 1) /* 123>&file - BAD */
8692 ash_msg_and_raise_error("redir error");
8694 goto store_expfname;
8697 fixredir(redir, fn.list->text, 1);
8705 * Evaluate a pipeline. All the processes in the pipeline are children
8706 * of the process creating the pipeline. (This differs from some versions
8707 * of the shell, which make the last process in a pipeline the parent
8711 evalpipe(union node *n, int flags)
8714 struct nodelist *lp;
8719 TRACE(("evalpipe(0x%lx) called\n", (long)n));
8721 for (lp = n->npipe.cmdlist; lp; lp = lp->next)
8725 jp = makejob(/*n,*/ pipelen);
8727 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
8731 if (pipe(pip) < 0) {
8733 ash_msg_and_raise_error("pipe call failed");
8736 if (forkshell(jp, lp->n, n->npipe.pipe_backgnd) == 0) {
8749 evaltreenr(lp->n, flags);
8755 /* Don't want to trigger debugging */
8759 if (n->npipe.pipe_backgnd == 0) {
8760 exitstatus = waitforjob(jp);
8761 TRACE(("evalpipe: job done exit status %d\n", exitstatus));
8767 * Controls whether the shell is interactive or not.
8770 setinteractive(int on)
8772 static smallint is_interactive;
8774 if (++on == is_interactive)
8776 is_interactive = on;
8780 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
8781 if (is_interactive > 1) {
8782 /* Looks like they want an interactive shell */
8783 static smallint did_banner;
8786 /* note: ash and hush share this string */
8787 out1fmt("\n\n%s %s\n"
8788 "Enter 'help' for a list of built-in commands."
8791 "built-in shell (ash)"
8805 setinteractive(iflag);
8807 #if ENABLE_FEATURE_EDITING_VI
8809 line_input_state->flags |= VI_MODE;
8811 line_input_state->flags &= ~VI_MODE;
8813 viflag = 0; /* forcibly keep the option off */
8817 static struct localvar *localvars;
8820 * Called after a function returns.
8821 * Interrupts must be off.
8826 struct localvar *lvp;
8829 while ((lvp = localvars) != NULL) {
8830 localvars = lvp->next;
8832 TRACE(("poplocalvar %s\n", vp ? vp->var_text : "-"));
8833 if (vp == NULL) { /* $- saved */
8834 memcpy(optlist, lvp->text, sizeof(optlist));
8835 free((char*)lvp->text);
8837 } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) {
8838 unsetvar(vp->var_text);
8841 vp->var_func(var_end(lvp->text));
8842 if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
8843 free((char*)vp->var_text);
8844 vp->flags = lvp->flags;
8845 vp->var_text = lvp->text;
8852 evalfun(struct funcnode *func, int argc, char **argv, int flags)
8854 volatile struct shparam saveparam;
8855 struct localvar *volatile savelocalvars;
8856 struct jmploc *volatile savehandler;
8857 struct jmploc jmploc;
8860 saveparam = shellparam;
8861 savelocalvars = localvars;
8862 e = setjmp(jmploc.loc);
8867 savehandler = exception_handler;
8868 exception_handler = &jmploc;
8870 shellparam.malloced = 0;
8874 shellparam.nparam = argc - 1;
8875 shellparam.p = argv + 1;
8876 #if ENABLE_ASH_GETOPTS
8877 shellparam.optind = 1;
8878 shellparam.optoff = -1;
8880 evaltree(&func->n, flags & EV_TESTED);
8886 localvars = savelocalvars;
8887 freeparam(&shellparam);
8888 shellparam = saveparam;
8889 exception_handler = savehandler;
8891 evalskip &= ~SKIPFUNC;
8895 #if ENABLE_ASH_CMDCMD
8897 parse_command_args(char **argv, const char **path)
8910 if (c == '-' && !*cp) {
8917 *path = bb_default_path;
8920 /* run 'typecmd' for other options */
8931 * Make a variable a local variable. When a variable is made local, it's
8932 * value and flags are saved in a localvar structure. The saved values
8933 * will be restored when the shell function returns. We handle the name
8934 * "-" as a special case.
8939 struct localvar *lvp;
8944 lvp = ckzalloc(sizeof(struct localvar));
8945 if (LONE_DASH(name)) {
8947 p = ckmalloc(sizeof(optlist));
8948 lvp->text = memcpy(p, optlist, sizeof(optlist));
8953 vpp = hashvar(name);
8954 vp = *findvar(vpp, name);
8955 eq = strchr(name, '=');
8958 setvareq(name, VSTRFIXED);
8960 setvar(name, NULL, VSTRFIXED);
8961 vp = *vpp; /* the new variable */
8962 lvp->flags = VUNSET;
8964 lvp->text = vp->var_text;
8965 lvp->flags = vp->flags;
8966 vp->flags |= VSTRFIXED|VTEXTFIXED;
8972 lvp->next = localvars;
8978 * The "local" command.
8980 static int FAST_FUNC
8981 localcmd(int argc UNUSED_PARAM, char **argv)
8986 while ((name = *argv++) != NULL) {
8992 static int FAST_FUNC
8993 falsecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
8998 static int FAST_FUNC
8999 truecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
9004 static int FAST_FUNC
9005 execcmd(int argc UNUSED_PARAM, char **argv)
9008 iflag = 0; /* exit on error */
9011 shellexec(argv + 1, pathval(), 0);
9017 * The return command.
9019 static int FAST_FUNC
9020 returncmd(int argc UNUSED_PARAM, char **argv)
9023 * If called outside a function, do what ksh does;
9024 * skip the rest of the file.
9026 evalskip = funcnest ? SKIPFUNC : SKIPFILE;
9027 return argv[1] ? number(argv[1]) : exitstatus;
9030 /* Forward declarations for builtintab[] */
9031 static int breakcmd(int, char **) FAST_FUNC;
9032 static int dotcmd(int, char **) FAST_FUNC;
9033 static int evalcmd(int, char **) FAST_FUNC;
9034 static int exitcmd(int, char **) FAST_FUNC;
9035 static int exportcmd(int, char **) FAST_FUNC;
9036 #if ENABLE_ASH_GETOPTS
9037 static int getoptscmd(int, char **) FAST_FUNC;
9039 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
9040 static int helpcmd(int, char **) FAST_FUNC;
9042 #if ENABLE_SH_MATH_SUPPORT
9043 static int letcmd(int, char **) FAST_FUNC;
9045 static int readcmd(int, char **) FAST_FUNC;
9046 static int setcmd(int, char **) FAST_FUNC;
9047 static int shiftcmd(int, char **) FAST_FUNC;
9048 static int timescmd(int, char **) FAST_FUNC;
9049 static int trapcmd(int, char **) FAST_FUNC;
9050 static int umaskcmd(int, char **) FAST_FUNC;
9051 static int unsetcmd(int, char **) FAST_FUNC;
9052 static int ulimitcmd(int, char **) FAST_FUNC;
9054 #define BUILTIN_NOSPEC "0"
9055 #define BUILTIN_SPECIAL "1"
9056 #define BUILTIN_REGULAR "2"
9057 #define BUILTIN_SPEC_REG "3"
9058 #define BUILTIN_ASSIGN "4"
9059 #define BUILTIN_SPEC_ASSG "5"
9060 #define BUILTIN_REG_ASSG "6"
9061 #define BUILTIN_SPEC_REG_ASSG "7"
9063 /* Stubs for calling non-FAST_FUNC's */
9064 #if ENABLE_ASH_BUILTIN_ECHO
9065 static int FAST_FUNC echocmd(int argc, char **argv) { return echo_main(argc, argv); }
9067 #if ENABLE_ASH_BUILTIN_PRINTF
9068 static int FAST_FUNC printfcmd(int argc, char **argv) { return printf_main(argc, argv); }
9070 #if ENABLE_ASH_BUILTIN_TEST
9071 static int FAST_FUNC testcmd(int argc, char **argv) { return test_main(argc, argv); }
9074 /* Keep these in proper order since it is searched via bsearch() */
9075 static const struct builtincmd builtintab[] = {
9076 { BUILTIN_SPEC_REG "." , dotcmd },
9077 { BUILTIN_SPEC_REG ":" , truecmd },
9078 #if ENABLE_ASH_BUILTIN_TEST
9079 { BUILTIN_REGULAR "[" , testcmd },
9080 #if ENABLE_ASH_BASH_COMPAT
9081 { BUILTIN_REGULAR "[[" , testcmd },
9084 #if ENABLE_ASH_ALIAS
9085 { BUILTIN_REG_ASSG "alias" , aliascmd },
9088 { BUILTIN_REGULAR "bg" , fg_bgcmd },
9090 { BUILTIN_SPEC_REG "break" , breakcmd },
9091 { BUILTIN_REGULAR "cd" , cdcmd },
9092 { BUILTIN_NOSPEC "chdir" , cdcmd },
9093 #if ENABLE_ASH_CMDCMD
9094 { BUILTIN_REGULAR "command" , commandcmd },
9096 { BUILTIN_SPEC_REG "continue", breakcmd },
9097 #if ENABLE_ASH_BUILTIN_ECHO
9098 { BUILTIN_REGULAR "echo" , echocmd },
9100 { BUILTIN_SPEC_REG "eval" , evalcmd },
9101 { BUILTIN_SPEC_REG "exec" , execcmd },
9102 { BUILTIN_SPEC_REG "exit" , exitcmd },
9103 { BUILTIN_SPEC_REG_ASSG "export" , exportcmd },
9104 { BUILTIN_REGULAR "false" , falsecmd },
9106 { BUILTIN_REGULAR "fg" , fg_bgcmd },
9108 #if ENABLE_ASH_GETOPTS
9109 { BUILTIN_REGULAR "getopts" , getoptscmd },
9111 { BUILTIN_NOSPEC "hash" , hashcmd },
9112 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
9113 { BUILTIN_NOSPEC "help" , helpcmd },
9116 { BUILTIN_REGULAR "jobs" , jobscmd },
9117 { BUILTIN_REGULAR "kill" , killcmd },
9119 #if ENABLE_SH_MATH_SUPPORT
9120 { BUILTIN_NOSPEC "let" , letcmd },
9122 { BUILTIN_ASSIGN "local" , localcmd },
9123 #if ENABLE_ASH_BUILTIN_PRINTF
9124 { BUILTIN_REGULAR "printf" , printfcmd },
9126 { BUILTIN_NOSPEC "pwd" , pwdcmd },
9127 { BUILTIN_REGULAR "read" , readcmd },
9128 { BUILTIN_SPEC_REG_ASSG "readonly", exportcmd },
9129 { BUILTIN_SPEC_REG "return" , returncmd },
9130 { BUILTIN_SPEC_REG "set" , setcmd },
9131 { BUILTIN_SPEC_REG "shift" , shiftcmd },
9132 #if ENABLE_ASH_BASH_COMPAT
9133 { BUILTIN_SPEC_REG "source" , dotcmd },
9135 #if ENABLE_ASH_BUILTIN_TEST
9136 { BUILTIN_REGULAR "test" , testcmd },
9138 { BUILTIN_SPEC_REG "times" , timescmd },
9139 { BUILTIN_SPEC_REG "trap" , trapcmd },
9140 { BUILTIN_REGULAR "true" , truecmd },
9141 { BUILTIN_NOSPEC "type" , typecmd },
9142 { BUILTIN_NOSPEC "ulimit" , ulimitcmd },
9143 { BUILTIN_REGULAR "umask" , umaskcmd },
9144 #if ENABLE_ASH_ALIAS
9145 { BUILTIN_REGULAR "unalias" , unaliascmd },
9147 { BUILTIN_SPEC_REG "unset" , unsetcmd },
9148 { BUILTIN_REGULAR "wait" , waitcmd },
9151 /* Should match the above table! */
9152 #define COMMANDCMD (builtintab + \
9154 1 * ENABLE_ASH_BUILTIN_TEST + \
9155 1 * ENABLE_ASH_BUILTIN_TEST * ENABLE_ASH_BASH_COMPAT + \
9156 1 * ENABLE_ASH_ALIAS + \
9157 1 * ENABLE_ASH_JOB_CONTROL + \
9159 #define EXECCMD (builtintab + \
9161 1 * ENABLE_ASH_BUILTIN_TEST + \
9162 1 * ENABLE_ASH_BUILTIN_TEST * ENABLE_ASH_BASH_COMPAT + \
9163 1 * ENABLE_ASH_ALIAS + \
9164 1 * ENABLE_ASH_JOB_CONTROL + \
9166 1 * ENABLE_ASH_CMDCMD + \
9168 ENABLE_ASH_BUILTIN_ECHO + \
9172 * Search the table of builtin commands.
9174 static struct builtincmd *
9175 find_builtin(const char *name)
9177 struct builtincmd *bp;
9180 name, builtintab, ARRAY_SIZE(builtintab), sizeof(builtintab[0]),
9187 * Execute a simple command.
9190 isassignment(const char *p)
9192 const char *q = endofname(p);
9197 static int FAST_FUNC
9198 bltincmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
9200 /* Preserve exitstatus of a previous possible redirection
9201 * as POSIX mandates */
9202 return back_exitstatus;
9205 evalcommand(union node *cmd, int flags)
9207 static const struct builtincmd null_bltin = {
9208 "\0\0", bltincmd /* why three NULs? */
9210 struct stackmark smark;
9212 struct arglist arglist;
9213 struct arglist varlist;
9216 const struct strlist *sp;
9217 struct cmdentry cmdentry;
9224 struct builtincmd *bcmd;
9225 smallint cmd_is_exec;
9226 smallint pseudovarflag = 0;
9228 /* First expand the arguments. */
9229 TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags));
9230 setstackmark(&smark);
9231 back_exitstatus = 0;
9233 cmdentry.cmdtype = CMDBUILTIN;
9234 cmdentry.u.cmd = &null_bltin;
9235 varlist.lastp = &varlist.list;
9236 *varlist.lastp = NULL;
9237 arglist.lastp = &arglist.list;
9238 *arglist.lastp = NULL;
9241 if (cmd->ncmd.args) {
9242 bcmd = find_builtin(cmd->ncmd.args->narg.text);
9243 pseudovarflag = bcmd && IS_BUILTIN_ASSIGN(bcmd);
9246 for (argp = cmd->ncmd.args; argp; argp = argp->narg.next) {
9247 struct strlist **spp;
9249 spp = arglist.lastp;
9250 if (pseudovarflag && isassignment(argp->narg.text))
9251 expandarg(argp, &arglist, EXP_VARTILDE);
9253 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
9255 for (sp = *spp; sp; sp = sp->next)
9259 argv = nargv = stalloc(sizeof(char *) * (argc + 1));
9260 for (sp = arglist.list; sp; sp = sp->next) {
9261 TRACE(("evalcommand arg: %s\n", sp->text));
9262 *nargv++ = sp->text;
9267 if (iflag && funcnest == 0 && argc > 0)
9268 lastarg = nargv[-1];
9271 expredir(cmd->ncmd.redirect);
9272 status = redirectsafe(cmd->ncmd.redirect, REDIR_PUSH | REDIR_SAVEFD2);
9274 path = vpath.var_text;
9275 for (argp = cmd->ncmd.assign; argp; argp = argp->narg.next) {
9276 struct strlist **spp;
9279 spp = varlist.lastp;
9280 expandarg(argp, &varlist, EXP_VARTILDE);
9283 * Modify the command lookup path, if a PATH= assignment
9287 if (varcmp(p, path) == 0)
9291 /* Print the command if xflag is set. */
9294 const char *p = " %s" + 1;
9296 fdprintf(preverrout_fd, p, expandstr(ps4val()));
9298 for (n = 0; n < 2; n++) {
9300 fdprintf(preverrout_fd, p, sp->text);
9306 safe_write(preverrout_fd, "\n", 1);
9312 /* Now locate the command. */
9314 int cmd_flag = DO_ERR;
9315 #if ENABLE_ASH_CMDCMD
9316 const char *oldpath = path + 5;
9320 find_command(argv[0], &cmdentry, cmd_flag, path);
9321 if (cmdentry.cmdtype == CMDUNKNOWN) {
9322 flush_stdout_stderr();
9327 /* implement bltin and command here */
9328 if (cmdentry.cmdtype != CMDBUILTIN)
9331 spclbltin = IS_BUILTIN_SPECIAL(cmdentry.u.cmd);
9332 if (cmdentry.u.cmd == EXECCMD)
9334 #if ENABLE_ASH_CMDCMD
9335 if (cmdentry.u.cmd == COMMANDCMD) {
9337 nargv = parse_command_args(argv, &path);
9340 argc -= nargv - argv;
9342 cmd_flag |= DO_NOFUNC;
9350 /* We have a redirection error. */
9352 raise_exception(EXERROR);
9354 exitstatus = status;
9358 /* Execute the command. */
9359 switch (cmdentry.cmdtype) {
9362 #if ENABLE_FEATURE_SH_NOFORK
9363 /* (1) BUG: if variables are set, we need to fork, or save/restore them
9364 * around run_nofork_applet() call.
9365 * (2) Should this check also be done in forkshell()?
9366 * (perhaps it should, so that "VAR=VAL nofork" at least avoids exec...)
9368 /* find_command() encodes applet_no as (-2 - applet_no) */
9369 int applet_no = (- cmdentry.u.index - 2);
9370 if (applet_no >= 0 && APPLET_IS_NOFORK(applet_no)) {
9371 listsetvar(varlist.list, VEXPORT|VSTACK);
9372 /* run <applet>_main() */
9373 exitstatus = run_nofork_applet(applet_no, argv);
9377 /* Can we avoid forking off? For example, very last command
9378 * in a script or a subshell does not need forking,
9379 * we can just exec it.
9381 if (!(flags & EV_EXIT) || may_have_traps) {
9382 /* No, forking off a child is necessary */
9384 jp = makejob(/*cmd,*/ 1);
9385 if (forkshell(jp, cmd, FORK_FG) != 0) {
9387 exitstatus = waitforjob(jp);
9389 TRACE(("forked child exited with %d\n", exitstatus));
9394 /* fall through to exec'ing external program */
9396 listsetvar(varlist.list, VEXPORT|VSTACK);
9397 shellexec(argv, path, cmdentry.u.index);
9401 cmdenviron = varlist.list;
9403 struct strlist *list = cmdenviron;
9405 if (spclbltin > 0 || argc == 0) {
9407 if (cmd_is_exec && argc > 1)
9410 listsetvar(list, i);
9412 /* Tight loop with builtins only:
9413 * "while kill -0 $child; do true; done"
9414 * will never exit even if $child died, unless we do this
9415 * to reap the zombie and make kill detect that it's gone: */
9416 dowait(DOWAIT_NONBLOCK, NULL);
9418 if (evalbltin(cmdentry.u.cmd, argc, argv)) {
9420 int i = exception_type;
9425 exit_status = 128 + SIGINT;
9427 exit_status = 128 + pending_sig;
9428 exitstatus = exit_status;
9429 if (i == EXINT || spclbltin > 0) {
9431 longjmp(exception_handler->loc, 1);
9438 listsetvar(varlist.list, 0);
9439 /* See above for the rationale */
9440 dowait(DOWAIT_NONBLOCK, NULL);
9441 if (evalfun(cmdentry.u.func, argc, argv, flags))
9448 popredir(/*drop:*/ cmd_is_exec, /*restore:*/ cmd_is_exec);
9450 /* dsl: I think this is intended to be used to support
9451 * '_' in 'vi' command mode during line editing...
9452 * However I implemented that within libedit itself.
9454 setvar("_", lastarg, 0);
9456 popstackmark(&smark);
9460 evalbltin(const struct builtincmd *cmd, int argc, char **argv)
9462 char *volatile savecmdname;
9463 struct jmploc *volatile savehandler;
9464 struct jmploc jmploc;
9467 savecmdname = commandname;
9468 i = setjmp(jmploc.loc);
9471 savehandler = exception_handler;
9472 exception_handler = &jmploc;
9473 commandname = argv[0];
9475 optptr = NULL; /* initialize nextopt */
9476 exitstatus = (*cmd->builtin)(argc, argv);
9477 flush_stdout_stderr();
9479 exitstatus |= ferror(stdout);
9481 commandname = savecmdname;
9482 exception_handler = savehandler;
9488 goodname(const char *p)
9490 return endofname(p)[0] == '\0';
9495 * Search for a command. This is called before we fork so that the
9496 * location of the command will be available in the parent as well as
9497 * the child. The check for "goodname" is an overly conservative
9498 * check that the name will not be subject to expansion.
9501 prehash(union node *n)
9503 struct cmdentry entry;
9505 if (n->type == NCMD && n->ncmd.args && goodname(n->ncmd.args->narg.text))
9506 find_command(n->ncmd.args->narg.text, &entry, 0, pathval());
9510 /* ============ Builtin commands
9512 * Builtin commands whose functions are closely tied to evaluation
9513 * are implemented here.
9517 * Handle break and continue commands. Break, continue, and return are
9518 * all handled by setting the evalskip flag. The evaluation routines
9519 * above all check this flag, and if it is set they start skipping
9520 * commands rather than executing them. The variable skipcount is
9521 * the number of loops to break/continue, or the number of function
9522 * levels to return. (The latter is always 1.) It should probably
9523 * be an error to break out of more loops than exist, but it isn't
9524 * in the standard shell so we don't make it one here.
9526 static int FAST_FUNC
9527 breakcmd(int argc UNUSED_PARAM, char **argv)
9529 int n = argv[1] ? number(argv[1]) : 1;
9532 ash_msg_and_raise_error(msg_illnum, argv[1]);
9536 evalskip = (**argv == 'c') ? SKIPCONT : SKIPBREAK;
9543 /* ============ input.c
9545 * This implements the input routines used by the parser.
9549 INPUT_PUSH_FILE = 1,
9550 INPUT_NOFILE_OK = 2,
9553 static smallint checkkwd;
9554 /* values of checkkwd variable */
9555 #define CHKALIAS 0x1
9560 * Push a string back onto the input at this current parsefile level.
9561 * We handle aliases this way.
9563 #if !ENABLE_ASH_ALIAS
9564 #define pushstring(s, ap) pushstring(s)
9567 pushstring(char *s, struct alias *ap)
9574 if (g_parsefile->strpush) {
9575 sp = ckzalloc(sizeof(*sp));
9576 sp->prev = g_parsefile->strpush;
9578 sp = &(g_parsefile->basestrpush);
9580 g_parsefile->strpush = sp;
9581 sp->prev_string = g_parsefile->next_to_pgetc;
9582 sp->prev_left_in_line = g_parsefile->left_in_line;
9583 #if ENABLE_ASH_ALIAS
9586 ap->flag |= ALIASINUSE;
9590 g_parsefile->next_to_pgetc = s;
9591 g_parsefile->left_in_line = len;
9598 struct strpush *sp = g_parsefile->strpush;
9601 #if ENABLE_ASH_ALIAS
9603 if (g_parsefile->next_to_pgetc[-1] == ' '
9604 || g_parsefile->next_to_pgetc[-1] == '\t'
9606 checkkwd |= CHKALIAS;
9608 if (sp->string != sp->ap->val) {
9611 sp->ap->flag &= ~ALIASINUSE;
9612 if (sp->ap->flag & ALIASDEAD) {
9613 unalias(sp->ap->name);
9617 g_parsefile->next_to_pgetc = sp->prev_string;
9618 g_parsefile->left_in_line = sp->prev_left_in_line;
9619 g_parsefile->strpush = sp->prev;
9620 if (sp != &(g_parsefile->basestrpush))
9625 //FIXME: BASH_COMPAT with "...&" does TWO pungetc():
9626 //it peeks whether it is &>, and then pushes back both chars.
9627 //This function needs to save last *next_to_pgetc to buf[0]
9628 //to make two pungetc() reliable. Currently,
9629 // pgetc (out of buf: does preadfd), pgetc, pungetc, pungetc won't work...
9634 char *buf = g_parsefile->buf;
9636 g_parsefile->next_to_pgetc = buf;
9637 #if ENABLE_FEATURE_EDITING
9639 if (!iflag || g_parsefile->pf_fd != STDIN_FILENO)
9640 nr = nonblock_immune_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1, /*loop_on_EINTR:*/ 1);
9643 # if ENABLE_ASH_IDLE_TIMEOUT
9645 const char *tmout_var = lookupvar("TMOUT");
9647 timeout = atoi(tmout_var) * 1000;
9653 # if ENABLE_FEATURE_TAB_COMPLETION
9654 line_input_state->path_lookup = pathval();
9656 /* Unicode support should be activated even if LANG is set
9657 * _during_ shell execution, not only if it was set when
9658 * shell was started. Therefore, re-check LANG every time:
9660 reinit_unicode(lookupvar("LANG"));
9661 nr = read_line_input(line_input_state, cmdedit_prompt, buf, IBUFSIZ, timeout);
9663 /* Ctrl+C pressed */
9674 /* Ctrl+D pressed */
9677 # if ENABLE_ASH_IDLE_TIMEOUT
9678 else if (errno == EAGAIN && timeout > 0) {
9679 printf("\007timed out waiting for input: auto-logout\n");
9686 nr = nonblock_immune_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1, /*loop_on_EINTR:*/ 1);
9689 #if 0 /* disabled: nonblock_immune_read() handles this problem */
9691 if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
9692 int flags = fcntl(0, F_GETFL);
9693 if (flags >= 0 && (flags & O_NONBLOCK)) {
9694 flags &= ~O_NONBLOCK;
9695 if (fcntl(0, F_SETFL, flags) >= 0) {
9696 out2str("sh: turning off NDELAY mode\n");
9707 * Refill the input buffer and return the next input character:
9709 * 1) If a string was pushed back on the input, pop it;
9710 * 2) If an EOF was pushed back (g_parsefile->left_in_line < -BIGNUM)
9711 * or we are reading from a string so we can't refill the buffer,
9713 * 3) If there is more stuff in this buffer, use it else call read to fill it.
9714 * 4) Process input up to the next newline, deleting nul characters.
9716 //#define pgetc_debug(...) bb_error_msg(__VA_ARGS__)
9717 #define pgetc_debug(...) ((void)0)
9724 while (g_parsefile->strpush) {
9725 #if ENABLE_ASH_ALIAS
9726 if (g_parsefile->left_in_line == -1
9727 && g_parsefile->strpush->ap
9728 && g_parsefile->next_to_pgetc[-1] != ' '
9729 && g_parsefile->next_to_pgetc[-1] != '\t'
9731 pgetc_debug("preadbuffer PEOA");
9736 /* try "pgetc" now: */
9737 pgetc_debug("preadbuffer internal pgetc at %d:%p'%s'",
9738 g_parsefile->left_in_line,
9739 g_parsefile->next_to_pgetc,
9740 g_parsefile->next_to_pgetc);
9741 if (--g_parsefile->left_in_line >= 0)
9742 return (unsigned char)(*g_parsefile->next_to_pgetc++);
9744 /* on both branches above g_parsefile->left_in_line < 0.
9745 * "pgetc" needs refilling.
9748 /* -90 is our -BIGNUM. Below we use -99 to mark "EOF on read",
9749 * pungetc() may increment it a few times.
9750 * Assuming it won't increment it to less than -90.
9752 if (g_parsefile->left_in_line < -90 || g_parsefile->buf == NULL) {
9753 pgetc_debug("preadbuffer PEOF1");
9754 /* even in failure keep left_in_line and next_to_pgetc
9755 * in lock step, for correct multi-layer pungetc.
9756 * left_in_line was decremented before preadbuffer(),
9757 * must inc next_to_pgetc: */
9758 g_parsefile->next_to_pgetc++;
9762 more = g_parsefile->left_in_buffer;
9764 flush_stdout_stderr();
9768 /* don't try reading again */
9769 g_parsefile->left_in_line = -99;
9770 pgetc_debug("preadbuffer PEOF2");
9771 g_parsefile->next_to_pgetc++;
9776 /* Find out where's the end of line.
9777 * Set g_parsefile->left_in_line
9778 * and g_parsefile->left_in_buffer acordingly.
9779 * NUL chars are deleted.
9781 q = g_parsefile->next_to_pgetc;
9789 memmove(q, q + 1, more);
9793 g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1;
9799 g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1;
9800 if (g_parsefile->left_in_line < 0)
9805 g_parsefile->left_in_buffer = more;
9810 out2str(g_parsefile->next_to_pgetc);
9814 pgetc_debug("preadbuffer at %d:%p'%s'",
9815 g_parsefile->left_in_line,
9816 g_parsefile->next_to_pgetc,
9817 g_parsefile->next_to_pgetc);
9818 return (unsigned char)*g_parsefile->next_to_pgetc++;
9821 #define pgetc_as_macro() \
9822 (--g_parsefile->left_in_line >= 0 \
9823 ? (unsigned char)*g_parsefile->next_to_pgetc++ \
9830 pgetc_debug("pgetc_fast at %d:%p'%s'",
9831 g_parsefile->left_in_line,
9832 g_parsefile->next_to_pgetc,
9833 g_parsefile->next_to_pgetc);
9834 return pgetc_as_macro();
9837 #if ENABLE_ASH_OPTIMIZE_FOR_SIZE
9838 # define pgetc_fast() pgetc()
9840 # define pgetc_fast() pgetc_as_macro()
9843 #if ENABLE_ASH_ALIAS
9845 pgetc_without_PEOA(void)
9849 pgetc_debug("pgetc_fast at %d:%p'%s'",
9850 g_parsefile->left_in_line,
9851 g_parsefile->next_to_pgetc,
9852 g_parsefile->next_to_pgetc);
9854 } while (c == PEOA);
9858 # define pgetc_without_PEOA() pgetc()
9862 * Read a line from the script.
9865 pfgets(char *line, int len)
9871 while (--nleft > 0) {
9872 c = pgetc_without_PEOA();
9887 * Undo the last call to pgetc. Only one character may be pushed back.
9888 * PEOF may be pushed back.
9893 g_parsefile->left_in_line++;
9894 g_parsefile->next_to_pgetc--;
9895 pgetc_debug("pushed back to %d:%p'%s'",
9896 g_parsefile->left_in_line,
9897 g_parsefile->next_to_pgetc,
9898 g_parsefile->next_to_pgetc);
9902 * To handle the "." command, a stack of input files is used. Pushfile
9903 * adds a new entry to the stack and popfile restores the previous level.
9908 struct parsefile *pf;
9910 pf = ckzalloc(sizeof(*pf));
9911 pf->prev = g_parsefile;
9913 /*pf->strpush = NULL; - ckzalloc did it */
9914 /*pf->basestrpush.prev = NULL;*/
9921 struct parsefile *pf = g_parsefile;
9929 g_parsefile = pf->prev;
9935 * Return to top level.
9940 while (g_parsefile != &basepf)
9945 * Close the file(s) that the shell is reading commands from. Called
9946 * after a fork is done.
9952 if (g_parsefile->pf_fd > 0) {
9953 close(g_parsefile->pf_fd);
9954 g_parsefile->pf_fd = 0;
9959 * Like setinputfile, but takes an open file descriptor. Call this with
9963 setinputfd(int fd, int push)
9965 close_on_exec_on(fd);
9968 g_parsefile->buf = NULL;
9970 g_parsefile->pf_fd = fd;
9971 if (g_parsefile->buf == NULL)
9972 g_parsefile->buf = ckmalloc(IBUFSIZ);
9973 g_parsefile->left_in_buffer = 0;
9974 g_parsefile->left_in_line = 0;
9975 g_parsefile->linno = 1;
9979 * Set the input to take input from a file. If push is set, push the
9980 * old input onto the stack first.
9983 setinputfile(const char *fname, int flags)
9989 fd = open(fname, O_RDONLY);
9991 if (flags & INPUT_NOFILE_OK)
9993 ash_msg_and_raise_error("can't open '%s'", fname);
9996 fd2 = copyfd(fd, 10);
9999 ash_msg_and_raise_error("out of file descriptors");
10002 setinputfd(fd, flags & INPUT_PUSH_FILE);
10009 * Like setinputfile, but takes input from a string.
10012 setinputstring(char *string)
10016 g_parsefile->next_to_pgetc = string;
10017 g_parsefile->left_in_line = strlen(string);
10018 g_parsefile->buf = NULL;
10019 g_parsefile->linno = 1;
10024 /* ============ mail.c
10026 * Routines to check for mail.
10029 #if ENABLE_ASH_MAIL
10031 #define MAXMBOXES 10
10033 /* times of mailboxes */
10034 static time_t mailtime[MAXMBOXES];
10035 /* Set if MAIL or MAILPATH is changed. */
10036 static smallint mail_var_path_changed;
10039 * Print appropriate message(s) if mail has arrived.
10040 * If mail_var_path_changed is set,
10041 * then the value of MAIL has mail_var_path_changed,
10042 * so we just update the values.
10051 struct stackmark smark;
10054 setstackmark(&smark);
10055 mpath = mpathset() ? mpathval() : mailval();
10056 for (mtp = mailtime; mtp < mailtime + MAXMBOXES; mtp++) {
10057 p = path_advance(&mpath, nullstr);
10062 for (q = p; *q; q++)
10068 q[-1] = '\0'; /* delete trailing '/' */
10069 if (stat(p, &statb) < 0) {
10073 if (!mail_var_path_changed && statb.st_mtime != *mtp) {
10076 pathopt ? pathopt : "you have mail"
10079 *mtp = statb.st_mtime;
10081 mail_var_path_changed = 0;
10082 popstackmark(&smark);
10085 static void FAST_FUNC
10086 changemail(const char *val UNUSED_PARAM)
10088 mail_var_path_changed = 1;
10091 #endif /* ASH_MAIL */
10094 /* ============ ??? */
10097 * Set the shell parameters.
10100 setparam(char **argv)
10106 for (nparam = 0; argv[nparam]; nparam++)
10108 ap = newparam = ckmalloc((nparam + 1) * sizeof(*ap));
10110 *ap++ = ckstrdup(*argv++);
10113 freeparam(&shellparam);
10114 shellparam.malloced = 1;
10115 shellparam.nparam = nparam;
10116 shellparam.p = newparam;
10117 #if ENABLE_ASH_GETOPTS
10118 shellparam.optind = 1;
10119 shellparam.optoff = -1;
10124 * Process shell options. The global variable argptr contains a pointer
10125 * to the argument list; we advance it past the options.
10127 * SUSv3 section 2.8.1 "Consequences of Shell Errors" says:
10128 * For a non-interactive shell, an error condition encountered
10129 * by a special built-in ... shall cause the shell to write a diagnostic message
10130 * to standard error and exit as shown in the following table:
10131 * Error Special Built-In
10133 * Utility syntax error (option or operand error) Shall exit
10135 * However, in bug 1142 (http://busybox.net/bugs/view.php?id=1142)
10136 * we see that bash does not do that (set "finishes" with error code 1 instead,
10137 * and shell continues), and people rely on this behavior!
10139 * set -o barfoo 2>/dev/null
10142 * Oh well. Let's mimic that.
10145 plus_minus_o(char *name, int val)
10150 for (i = 0; i < NOPTS; i++) {
10151 if (strcmp(name, optnames(i)) == 0) {
10156 ash_msg("illegal option %co %s", val ? '-' : '+', name);
10159 for (i = 0; i < NOPTS; i++) {
10161 out1fmt("%-16s%s\n", optnames(i), optlist[i] ? "on" : "off");
10163 out1fmt("set %co %s\n", optlist[i] ? '-' : '+', optnames(i));
10169 setoption(int flag, int val)
10173 for (i = 0; i < NOPTS; i++) {
10174 if (optletters(i) == flag) {
10179 ash_msg_and_raise_error("illegal option %c%c", val ? '-' : '+', flag);
10183 options(int cmdline)
10191 while ((p = *argptr) != NULL) {
10193 if (c != '-' && c != '+')
10196 val = 0; /* val = 0 if c == '+' */
10199 if (p[0] == '\0' || LONE_DASH(p)) {
10201 /* "-" means turn off -x and -v */
10204 /* "--" means reset params */
10205 else if (*argptr == NULL)
10208 break; /* "-" or "--" terminates options */
10211 /* first char was + or - */
10212 while ((c = *p++) != '\0') {
10213 /* bash 3.2 indeed handles -c CMD and +c CMD the same */
10214 if (c == 'c' && cmdline) {
10215 minusc = p; /* command is after shell args */
10216 } else if (c == 'o') {
10217 if (plus_minus_o(*argptr, val)) {
10218 /* it already printed err message */
10219 return 1; /* error */
10223 } else if (cmdline && (c == 'l')) { /* -l or +l == --login */
10225 /* bash does not accept +-login, we also won't */
10226 } else if (cmdline && val && (c == '-')) { /* long options */
10227 if (strcmp(p, "login") == 0)
10239 * The shift builtin command.
10241 static int FAST_FUNC
10242 shiftcmd(int argc UNUSED_PARAM, char **argv)
10249 n = number(argv[1]);
10250 if (n > shellparam.nparam)
10251 n = 0; /* bash compat, was = shellparam.nparam; */
10253 shellparam.nparam -= n;
10254 for (ap1 = shellparam.p; --n >= 0; ap1++) {
10255 if (shellparam.malloced)
10258 ap2 = shellparam.p;
10259 while ((*ap2++ = *ap1++) != NULL)
10261 #if ENABLE_ASH_GETOPTS
10262 shellparam.optind = 1;
10263 shellparam.optoff = -1;
10270 * POSIX requires that 'set' (but not export or readonly) output the
10271 * variables in lexicographic order - by the locale's collating order (sigh).
10272 * Maybe we could keep them in an ordered balanced binary tree
10273 * instead of hashed lists.
10274 * For now just roll 'em through qsort for printing...
10277 showvars(const char *sep_prefix, int on, int off)
10280 char **ep, **epend;
10282 ep = listvars(on, off, &epend);
10283 qsort(ep, epend - ep, sizeof(char *), vpcmp);
10285 sep = *sep_prefix ? " " : sep_prefix;
10287 for (; ep < epend; ep++) {
10291 p = strchrnul(*ep, '=');
10294 q = single_quote(++p);
10295 out1fmt("%s%s%.*s%s\n", sep_prefix, sep, (int)(p - *ep), *ep, q);
10301 * The set command builtin.
10303 static int FAST_FUNC
10304 setcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
10309 return showvars(nullstr, 0, VUNSET);
10312 retval = options(/*cmdline:*/ 0);
10313 if (retval == 0) { /* if no parse error... */
10315 if (*argptr != NULL) {
10323 #if ENABLE_ASH_RANDOM_SUPPORT
10324 static void FAST_FUNC
10325 change_random(const char *value)
10329 if (value == NULL) {
10330 /* "get", generate */
10331 t = next_random(&random_gen);
10332 /* set without recursion */
10333 setvar(vrandom.var_text, utoa(t), VNOFUNC);
10334 vrandom.flags &= ~VNOFUNC;
10337 t = strtoul(value, NULL, 10);
10338 INIT_RANDOM_T(&random_gen, (t ? t : 1), t);
10343 #if ENABLE_ASH_GETOPTS
10345 getopts(char *optstr, char *optvar, char **optfirst, int *param_optind, int *optoff)
10354 if (*param_optind < 1)
10356 optnext = optfirst + *param_optind - 1;
10358 if (*param_optind <= 1 || *optoff < 0 || (int)strlen(optnext[-1]) < *optoff)
10361 p = optnext[-1] + *optoff;
10362 if (p == NULL || *p == '\0') {
10363 /* Current word is done, advance */
10365 if (p == NULL || *p != '-' || *++p == '\0') {
10372 if (LONE_DASH(p)) /* check for "--" */
10377 for (q = optstr; *q != c;) {
10379 if (optstr[0] == ':') {
10382 err |= setvarsafe("OPTARG", s, 0);
10384 fprintf(stderr, "Illegal option -%c\n", c);
10385 unsetvar("OPTARG");
10395 if (*p == '\0' && (p = *optnext) == NULL) {
10396 if (optstr[0] == ':') {
10399 err |= setvarsafe("OPTARG", s, 0);
10402 fprintf(stderr, "No arg for -%c option\n", c);
10403 unsetvar("OPTARG");
10411 err |= setvarsafe("OPTARG", p, 0);
10414 err |= setvarsafe("OPTARG", nullstr, 0);
10416 *optoff = p ? p - *(optnext - 1) : -1;
10417 *param_optind = optnext - optfirst + 1;
10418 fmtstr(s, sizeof(s), "%d", *param_optind);
10419 err |= setvarsafe("OPTIND", s, VNOFUNC);
10422 err |= setvarsafe(optvar, s, 0);
10426 flush_stdout_stderr();
10427 raise_exception(EXERROR);
10433 * The getopts builtin. Shellparam.optnext points to the next argument
10434 * to be processed. Shellparam.optptr points to the next character to
10435 * be processed in the current argument. If shellparam.optnext is NULL,
10436 * then it's the first time getopts has been called.
10438 static int FAST_FUNC
10439 getoptscmd(int argc, char **argv)
10444 ash_msg_and_raise_error("usage: getopts optstring var [arg]");
10446 optbase = shellparam.p;
10447 if (shellparam.optind > shellparam.nparam + 1) {
10448 shellparam.optind = 1;
10449 shellparam.optoff = -1;
10452 optbase = &argv[3];
10453 if (shellparam.optind > argc - 2) {
10454 shellparam.optind = 1;
10455 shellparam.optoff = -1;
10459 return getopts(argv[1], argv[2], optbase, &shellparam.optind,
10460 &shellparam.optoff);
10462 #endif /* ASH_GETOPTS */
10465 /* ============ Shell parser */
10468 struct heredoc *next; /* next here document in list */
10469 union node *here; /* redirection node */
10470 char *eofmark; /* string indicating end of input */
10471 smallint striptabs; /* if set, strip leading tabs */
10474 static smallint tokpushback; /* last token pushed back */
10475 static smallint parsebackquote; /* nonzero if we are inside backquotes */
10476 static smallint quoteflag; /* set if (part of) last token was quoted */
10477 static token_id_t lasttoken; /* last token read (integer id Txxx) */
10478 static struct heredoc *heredoclist; /* list of here documents to read */
10479 static char *wordtext; /* text of last word returned by readtoken */
10480 static struct nodelist *backquotelist;
10481 static union node *redirnode;
10482 static struct heredoc *heredoc;
10484 static const char *
10485 tokname(char *buf, int tok)
10488 return tokname_array[tok] + 1;
10489 sprintf(buf, "\"%s\"", tokname_array[tok] + 1);
10493 /* raise_error_unexpected_syntax:
10494 * Called when an unexpected token is read during the parse. The argument
10495 * is the token that is expected, or -1 if more than one type of token can
10496 * occur at this point.
10498 static void raise_error_unexpected_syntax(int) NORETURN;
10500 raise_error_unexpected_syntax(int token)
10506 l = sprintf(msg, "unexpected %s", tokname(buf, lasttoken));
10508 sprintf(msg + l, " (expecting %s)", tokname(buf, token));
10509 raise_error_syntax(msg);
10513 #define EOFMARKLEN 79
10515 /* parsing is heavily cross-recursive, need these forward decls */
10516 static union node *andor(void);
10517 static union node *pipeline(void);
10518 static union node *parse_command(void);
10519 static void parseheredoc(void);
10520 static char peektoken(void);
10521 static int readtoken(void);
10523 static union node *
10526 union node *n1, *n2, *n3;
10529 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10530 if (nlflag == 2 && peektoken())
10536 if (tok == TBACKGND) {
10537 if (n2->type == NPIPE) {
10538 n2->npipe.pipe_backgnd = 1;
10540 if (n2->type != NREDIR) {
10541 n3 = stzalloc(sizeof(struct nredir));
10543 /*n3->nredir.redirect = NULL; - stzalloc did it */
10546 n2->type = NBACKGND;
10552 n3 = stzalloc(sizeof(struct nbinary));
10554 n3->nbinary.ch1 = n1;
10555 n3->nbinary.ch2 = n2;
10571 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10579 pungetc(); /* push back EOF on input */
10583 raise_error_unexpected_syntax(-1);
10590 static union node *
10593 union node *n1, *n2, *n3;
10601 } else if (t == TOR) {
10607 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10609 n3 = stzalloc(sizeof(struct nbinary));
10611 n3->nbinary.ch1 = n1;
10612 n3->nbinary.ch2 = n2;
10617 static union node *
10620 union node *n1, *n2, *pipenode;
10621 struct nodelist *lp, *prev;
10625 TRACE(("pipeline: entered\n"));
10626 if (readtoken() == TNOT) {
10628 checkkwd = CHKKWD | CHKALIAS;
10631 n1 = parse_command();
10632 if (readtoken() == TPIPE) {
10633 pipenode = stzalloc(sizeof(struct npipe));
10634 pipenode->type = NPIPE;
10635 /*pipenode->npipe.pipe_backgnd = 0; - stzalloc did it */
10636 lp = stzalloc(sizeof(struct nodelist));
10637 pipenode->npipe.cmdlist = lp;
10641 lp = stzalloc(sizeof(struct nodelist));
10642 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10643 lp->n = parse_command();
10645 } while (readtoken() == TPIPE);
10651 n2 = stzalloc(sizeof(struct nnot));
10659 static union node *
10664 n = stzalloc(sizeof(struct narg));
10666 /*n->narg.next = NULL; - stzalloc did it */
10667 n->narg.text = wordtext;
10668 n->narg.backquote = backquotelist;
10673 fixredir(union node *n, const char *text, int err)
10677 TRACE(("Fix redir %s %d\n", text, err));
10679 n->ndup.vname = NULL;
10681 fd = bb_strtou(text, NULL, 10);
10682 if (!errno && fd >= 0)
10683 n->ndup.dupfd = fd;
10684 else if (LONE_DASH(text))
10685 n->ndup.dupfd = -1;
10688 raise_error_syntax("bad fd number");
10689 n->ndup.vname = makename();
10694 * Returns true if the text contains nothing to expand (no dollar signs
10698 noexpand(const char *text)
10702 while ((c = *text++) != '\0') {
10703 if (c == CTLQUOTEMARK)
10707 else if (SIT(c, BASESYNTAX) == CCTL)
10716 union node *n = redirnode;
10718 if (readtoken() != TWORD)
10719 raise_error_unexpected_syntax(-1);
10720 if (n->type == NHERE) {
10721 struct heredoc *here = heredoc;
10725 if (quoteflag == 0)
10727 TRACE(("Here document %d\n", n->type));
10728 if (!noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN)
10729 raise_error_syntax("illegal eof marker for << redirection");
10730 rmescapes(wordtext, 0);
10731 here->eofmark = wordtext;
10733 if (heredoclist == NULL)
10734 heredoclist = here;
10736 for (p = heredoclist; p->next; p = p->next)
10740 } else if (n->type == NTOFD || n->type == NFROMFD) {
10741 fixredir(n, wordtext, 0);
10743 n->nfile.fname = makename();
10747 static union node *
10750 union node *args, **app;
10751 union node *n = NULL;
10752 union node *vars, **vpp;
10753 union node **rpp, *redir;
10755 #if ENABLE_ASH_BASH_COMPAT
10756 smallint double_brackets_flag = 0;
10766 savecheckkwd = CHKALIAS;
10769 checkkwd = savecheckkwd;
10772 #if ENABLE_ASH_BASH_COMPAT
10773 case TAND: /* "&&" */
10774 case TOR: /* "||" */
10775 if (!double_brackets_flag) {
10779 wordtext = (char *) (t == TAND ? "-a" : "-o");
10782 n = stzalloc(sizeof(struct narg));
10784 /*n->narg.next = NULL; - stzalloc did it */
10785 n->narg.text = wordtext;
10786 #if ENABLE_ASH_BASH_COMPAT
10787 if (strcmp("[[", wordtext) == 0)
10788 double_brackets_flag = 1;
10789 else if (strcmp("]]", wordtext) == 0)
10790 double_brackets_flag = 0;
10792 n->narg.backquote = backquotelist;
10793 if (savecheckkwd && isassignment(wordtext)) {
10795 vpp = &n->narg.next;
10798 app = &n->narg.next;
10803 *rpp = n = redirnode;
10804 rpp = &n->nfile.next;
10805 parsefname(); /* read name of redirection file */
10808 if (args && app == &args->narg.next
10811 struct builtincmd *bcmd;
10814 /* We have a function */
10815 if (readtoken() != TRP)
10816 raise_error_unexpected_syntax(TRP);
10817 name = n->narg.text;
10818 if (!goodname(name)
10819 || ((bcmd = find_builtin(name)) && IS_BUILTIN_SPECIAL(bcmd))
10821 raise_error_syntax("bad function name");
10824 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10825 n->narg.next = parse_command();
10838 n = stzalloc(sizeof(struct ncmd));
10840 n->ncmd.args = args;
10841 n->ncmd.assign = vars;
10842 n->ncmd.redirect = redir;
10846 static union node *
10847 parse_command(void)
10849 union node *n1, *n2;
10850 union node *ap, **app;
10851 union node *cp, **cpp;
10852 union node *redir, **rpp;
10859 switch (readtoken()) {
10861 raise_error_unexpected_syntax(-1);
10864 n1 = stzalloc(sizeof(struct nif));
10866 n1->nif.test = list(0);
10867 if (readtoken() != TTHEN)
10868 raise_error_unexpected_syntax(TTHEN);
10869 n1->nif.ifpart = list(0);
10871 while (readtoken() == TELIF) {
10872 n2->nif.elsepart = stzalloc(sizeof(struct nif));
10873 n2 = n2->nif.elsepart;
10875 n2->nif.test = list(0);
10876 if (readtoken() != TTHEN)
10877 raise_error_unexpected_syntax(TTHEN);
10878 n2->nif.ifpart = list(0);
10880 if (lasttoken == TELSE)
10881 n2->nif.elsepart = list(0);
10883 n2->nif.elsepart = NULL;
10891 n1 = stzalloc(sizeof(struct nbinary));
10892 n1->type = (lasttoken == TWHILE) ? NWHILE : NUNTIL;
10893 n1->nbinary.ch1 = list(0);
10896 TRACE(("expecting DO got '%s' %s\n", tokname_array[got] + 1,
10897 got == TWORD ? wordtext : ""));
10898 raise_error_unexpected_syntax(TDO);
10900 n1->nbinary.ch2 = list(0);
10905 if (readtoken() != TWORD || quoteflag || !goodname(wordtext))
10906 raise_error_syntax("bad for loop variable");
10907 n1 = stzalloc(sizeof(struct nfor));
10909 n1->nfor.var = wordtext;
10910 checkkwd = CHKKWD | CHKALIAS;
10911 if (readtoken() == TIN) {
10913 while (readtoken() == TWORD) {
10914 n2 = stzalloc(sizeof(struct narg));
10916 /*n2->narg.next = NULL; - stzalloc did it */
10917 n2->narg.text = wordtext;
10918 n2->narg.backquote = backquotelist;
10920 app = &n2->narg.next;
10923 n1->nfor.args = ap;
10924 if (lasttoken != TNL && lasttoken != TSEMI)
10925 raise_error_unexpected_syntax(-1);
10927 n2 = stzalloc(sizeof(struct narg));
10929 /*n2->narg.next = NULL; - stzalloc did it */
10930 n2->narg.text = (char *)dolatstr;
10931 /*n2->narg.backquote = NULL;*/
10932 n1->nfor.args = n2;
10934 * Newline or semicolon here is optional (but note
10935 * that the original Bourne shell only allowed NL).
10937 if (lasttoken != TNL && lasttoken != TSEMI)
10940 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10941 if (readtoken() != TDO)
10942 raise_error_unexpected_syntax(TDO);
10943 n1->nfor.body = list(0);
10947 n1 = stzalloc(sizeof(struct ncase));
10949 if (readtoken() != TWORD)
10950 raise_error_unexpected_syntax(TWORD);
10951 n1->ncase.expr = n2 = stzalloc(sizeof(struct narg));
10953 /*n2->narg.next = NULL; - stzalloc did it */
10954 n2->narg.text = wordtext;
10955 n2->narg.backquote = backquotelist;
10957 checkkwd = CHKKWD | CHKALIAS;
10958 } while (readtoken() == TNL);
10959 if (lasttoken != TIN)
10960 raise_error_unexpected_syntax(TIN);
10961 cpp = &n1->ncase.cases;
10963 checkkwd = CHKNL | CHKKWD;
10965 while (t != TESAC) {
10966 if (lasttoken == TLP)
10968 *cpp = cp = stzalloc(sizeof(struct nclist));
10970 app = &cp->nclist.pattern;
10972 *app = ap = stzalloc(sizeof(struct narg));
10974 /*ap->narg.next = NULL; - stzalloc did it */
10975 ap->narg.text = wordtext;
10976 ap->narg.backquote = backquotelist;
10977 if (readtoken() != TPIPE)
10979 app = &ap->narg.next;
10982 //ap->narg.next = NULL;
10983 if (lasttoken != TRP)
10984 raise_error_unexpected_syntax(TRP);
10985 cp->nclist.body = list(2);
10987 cpp = &cp->nclist.next;
10989 checkkwd = CHKNL | CHKKWD;
10993 raise_error_unexpected_syntax(TENDCASE);
11000 n1 = stzalloc(sizeof(struct nredir));
11001 n1->type = NSUBSHELL;
11002 n1->nredir.n = list(0);
11003 /*n1->nredir.redirect = NULL; - stzalloc did it */
11013 return simplecmd();
11016 if (readtoken() != t)
11017 raise_error_unexpected_syntax(t);
11020 /* Now check for redirection which may follow command */
11021 checkkwd = CHKKWD | CHKALIAS;
11023 while (readtoken() == TREDIR) {
11024 *rpp = n2 = redirnode;
11025 rpp = &n2->nfile.next;
11031 if (n1->type != NSUBSHELL) {
11032 n2 = stzalloc(sizeof(struct nredir));
11037 n1->nredir.redirect = redir;
11042 #if ENABLE_ASH_BASH_COMPAT
11043 static int decode_dollar_squote(void)
11045 static const char C_escapes[] ALIGN1 = "nrbtfav""x\\01234567";
11051 p = strchr(C_escapes, c);
11056 if ((unsigned char)(c - '0') <= 7) { /* \ooo */
11060 } while ((unsigned char)(c - '0') <= 7 && --cnt);
11062 } else if (c == 'x') { /* \xHH */
11066 } while (isxdigit(c) && --cnt);
11068 if (cnt == 3) { /* \x but next char is "bad" */
11072 } else { /* simple seq like \\ or \t */
11077 c = bb_process_escape_sequence((void*)&p);
11078 } else { /* unrecognized "\z": print both chars unless ' or " */
11079 if (c != '\'' && c != '"') {
11081 c |= 0x100; /* "please encode \, then me" */
11089 * If eofmark is NULL, read a word or a redirection symbol. If eofmark
11090 * is not NULL, read a here document. In the latter case, eofmark is the
11091 * word which marks the end of the document and striptabs is true if
11092 * leading tabs should be stripped from the document. The argument c
11093 * is the first character of the input token or document.
11095 * Because C does not have internal subroutines, I have simulated them
11096 * using goto's to implement the subroutine linkage. The following macros
11097 * will run code that appears at the end of readtoken1.
11099 #define CHECKEND() {goto checkend; checkend_return:;}
11100 #define PARSEREDIR() {goto parseredir; parseredir_return:;}
11101 #define PARSESUB() {goto parsesub; parsesub_return:;}
11102 #define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;}
11103 #define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;}
11104 #define PARSEARITH() {goto parsearith; parsearith_return:;}
11106 readtoken1(int c, int syntax, char *eofmark, int striptabs)
11108 /* NB: syntax parameter fits into smallint */
11109 /* c parameter is an unsigned char or PEOF or PEOA */
11112 char line[EOFMARKLEN + 1];
11113 struct nodelist *bqlist;
11117 smallint prevsyntax; /* syntax before arithmetic */
11118 #if ENABLE_ASH_EXPAND_PRMT
11119 smallint pssyntax; /* we are expanding a prompt string */
11121 int varnest; /* levels of variables expansion */
11122 int arinest; /* levels of arithmetic expansion */
11123 int parenlevel; /* levels of parens in arithmetic */
11124 int dqvarnest; /* levels of variables expansion within double quotes */
11126 IF_ASH_BASH_COMPAT(smallint bash_dollar_squote = 0;)
11129 /* Avoid longjmp clobbering */
11135 (void) &parenlevel;
11138 (void) &prevsyntax;
11141 startlinno = g_parsefile->linno;
11145 #if ENABLE_ASH_EXPAND_PRMT
11146 pssyntax = (syntax == PSSYNTAX);
11150 dblquote = (syntax == DQSYNTAX);
11156 STARTSTACKSTR(out);
11158 /* For each line, until end of word */
11159 CHECKEND(); /* set c to PEOF if at end of here document */
11160 for (;;) { /* until end of line or end of word */
11161 CHECKSTRSPACE(4, out); /* permit 4 calls to USTPUTC */
11162 switch (SIT(c, syntax)) {
11163 case CNL: /* '\n' */
11164 if (syntax == BASESYNTAX)
11165 goto endword; /* exit outer loop */
11167 g_parsefile->linno++;
11168 setprompt_if(doprompt, 2);
11170 goto loop; /* continue outer loop */
11175 if (eofmark == NULL || dblquote)
11176 USTPUTC(CTLESC, out);
11177 #if ENABLE_ASH_BASH_COMPAT
11178 if (c == '\\' && bash_dollar_squote) {
11179 c = decode_dollar_squote();
11181 USTPUTC('\\', out);
11182 c = (unsigned char)c;
11188 case CBACK: /* backslash */
11189 c = pgetc_without_PEOA();
11191 USTPUTC(CTLESC, out);
11192 USTPUTC('\\', out);
11194 } else if (c == '\n') {
11195 setprompt_if(doprompt, 2);
11197 #if ENABLE_ASH_EXPAND_PRMT
11198 if (c == '$' && pssyntax) {
11199 USTPUTC(CTLESC, out);
11200 USTPUTC('\\', out);
11203 /* Backslash is retained if we are in "str" and next char isn't special */
11208 && (c != '"' || eofmark != NULL)
11210 USTPUTC(CTLESC, out);
11211 USTPUTC('\\', out);
11213 if (SIT(c, SQSYNTAX) == CCTL)
11214 USTPUTC(CTLESC, out);
11222 if (eofmark == NULL) {
11223 USTPUTC(CTLQUOTEMARK, out);
11231 IF_ASH_BASH_COMPAT(bash_dollar_squote = 0;)
11232 if (eofmark != NULL && arinest == 0
11237 if (dqvarnest == 0) {
11238 syntax = BASESYNTAX;
11245 case CVAR: /* '$' */
11246 PARSESUB(); /* parse substitution */
11248 case CENDVAR: /* '}' */
11251 if (dqvarnest > 0) {
11258 #if ENABLE_SH_MATH_SUPPORT
11259 case CLP: /* '(' in arithmetic */
11263 case CRP: /* ')' in arithmetic */
11264 if (parenlevel > 0) {
11267 if (pgetc() == ')') {
11268 if (--arinest == 0) {
11269 syntax = prevsyntax;
11270 dblquote = (syntax == DQSYNTAX);
11275 * unbalanced parens
11276 * (don't 2nd guess - no error)
11284 case CBQUOTE: /* '`' */
11288 goto endword; /* exit outer loop */
11292 if (varnest == 0) {
11293 #if ENABLE_ASH_BASH_COMPAT
11295 if (pgetc() == '>')
11296 c = 0x100 + '>'; /* flag &> */
11300 goto endword; /* exit outer loop */
11302 IF_ASH_ALIAS(if (c != PEOA))
11309 #if ENABLE_SH_MATH_SUPPORT
11310 if (syntax == ARISYNTAX)
11311 raise_error_syntax("missing '))'");
11313 if (syntax != BASESYNTAX && !parsebackquote && eofmark == NULL)
11314 raise_error_syntax("unterminated quoted string");
11315 if (varnest != 0) {
11316 startlinno = g_parsefile->linno;
11318 raise_error_syntax("missing '}'");
11320 USTPUTC('\0', out);
11321 len = out - (char *)stackblock();
11322 out = stackblock();
11323 if (eofmark == NULL) {
11324 if ((c == '>' || c == '<' IF_ASH_BASH_COMPAT( || c == 0x100 + '>'))
11327 if (isdigit_str9(out)) {
11328 PARSEREDIR(); /* passed as params: out, c */
11329 lasttoken = TREDIR;
11332 /* else: non-number X seen, interpret it
11333 * as "NNNX>file" = "NNNX >file" */
11337 quoteflag = quotef;
11338 backquotelist = bqlist;
11339 grabstackblock(len);
11343 /* end of readtoken routine */
11346 * Check to see whether we are at the end of the here document. When this
11347 * is called, c is set to the first character of the next input line. If
11348 * we are at the end of the here document, this routine sets the c to PEOF.
11352 #if ENABLE_ASH_ALIAS
11354 c = pgetc_without_PEOA();
11357 while (c == '\t') {
11358 c = pgetc_without_PEOA();
11361 if (c == *eofmark) {
11362 if (pfgets(line, sizeof(line)) != NULL) {
11366 for (q = eofmark + 1; *q && *p == *q; p++, q++)
11368 if (*p == '\n' && *q == '\0') {
11370 g_parsefile->linno++;
11371 needprompt = doprompt;
11373 pushstring(line, NULL);
11378 goto checkend_return;
11382 * Parse a redirection operator. The variable "out" points to a string
11383 * specifying the fd to be redirected. The variable "c" contains the
11384 * first character of the redirection operator.
11387 /* out is already checked to be a valid number or "" */
11388 int fd = (*out == '\0' ? -1 : atoi(out));
11391 np = stzalloc(sizeof(struct nfile));
11396 np->type = NAPPEND;
11398 np->type = NCLOBBER;
11401 /* it also can be NTO2 (>&file), but we can't figure it out yet */
11407 #if ENABLE_ASH_BASH_COMPAT
11408 else if (c == 0x100 + '>') { /* this flags &> redirection */
11410 pgetc(); /* this is '>', no need to check */
11414 else { /* c == '<' */
11415 /*np->nfile.fd = 0; - stzalloc did it */
11419 if (sizeof(struct nfile) != sizeof(struct nhere)) {
11420 np = stzalloc(sizeof(struct nhere));
11421 /*np->nfile.fd = 0; - stzalloc did it */
11424 heredoc = stzalloc(sizeof(struct heredoc));
11425 heredoc->here = np;
11428 heredoc->striptabs = 1;
11430 /*heredoc->striptabs = 0; - stzalloc did it */
11436 np->type = NFROMFD;
11440 np->type = NFROMTO;
11452 goto parseredir_return;
11456 * Parse a substitution. At this point, we have read the dollar sign
11457 * and nothing else.
11460 /* is_special(c) evaluates to 1 for c in "!#$*-0123456789?@"; 0 otherwise
11461 * (assuming ascii char codes, as the original implementation did) */
11462 #define is_special(c) \
11463 (((unsigned)(c) - 33 < 32) \
11464 && ((0xc1ff920dU >> ((unsigned)(c) - 33)) & 1))
11466 unsigned char subtype;
11471 if (c > 255 /* PEOA or PEOF */
11472 || (c != '(' && c != '{' && !is_name(c) && !is_special(c))
11474 #if ENABLE_ASH_BASH_COMPAT
11476 bash_dollar_squote = 1;
11481 } else if (c == '(') {
11482 /* $(command) or $((arith)) */
11483 if (pgetc() == '(') {
11484 #if ENABLE_SH_MATH_SUPPORT
11487 raise_error_syntax("you disabled math support for $((arith)) syntax");
11494 /* $VAR, $<specialchar>, ${...}, or PEOA/PEOF */
11495 USTPUTC(CTLVAR, out);
11496 typeloc = out - (char *)stackblock();
11497 USTPUTC(VSNORMAL, out);
11498 subtype = VSNORMAL;
11504 c = '#'; /* ${#} - same as $# */
11506 subtype = VSLENGTH; /* ${#VAR} */
11511 if (c <= 255 /* not PEOA or PEOF */ && is_name(c)) {
11512 /* $[{[#]]NAME[}] */
11516 } while (c <= 255 /* not PEOA or PEOF */ && is_in_name(c));
11517 } else if (isdigit(c)) {
11518 /* $[{[#]]NUM[}] */
11522 } while (isdigit(c));
11523 } else if (is_special(c)) {
11524 /* $[{[#]]<specialchar>[}] */
11529 raise_error_syntax("bad substitution");
11531 if (c != '}' && subtype == VSLENGTH) {
11532 /* ${#VAR didn't end with } */
11538 if (subtype == 0) {
11539 /* ${VAR...} but not $VAR or ${#VAR} */
11540 /* c == first char after VAR */
11544 #if ENABLE_ASH_BASH_COMPAT
11545 if (c == ':' || c == '$' || isdigit(c)) {
11546 //TODO: support more general format ${v:EXPR:EXPR},
11547 // where EXPR follows $(()) rules
11548 subtype = VSSUBSTR;
11550 break; /* "goto do_pungetc" is bigger (!) */
11556 static const char types[] ALIGN1 = "}-+?=";
11557 const char *p = strchr(types, c);
11560 subtype = p - types + VSNORMAL;
11566 subtype = (c == '#' ? VSTRIMLEFT : VSTRIMRIGHT);
11573 #if ENABLE_ASH_BASH_COMPAT
11575 /* ${v/[/]pattern/repl} */
11576 //TODO: encode pattern and repl separately.
11577 // Currently ${v/$var_with_slash/repl} is horribly broken
11578 subtype = VSREPLACE;
11582 subtype++; /* VSREPLACEALL */
11590 if (dblquote || arinest)
11592 ((unsigned char *)stackblock())[typeloc] = subtype | flags;
11593 if (subtype != VSNORMAL) {
11595 if (dblquote || arinest) {
11600 goto parsesub_return;
11604 * Called to parse command substitutions. Newstyle is set if the command
11605 * is enclosed inside $(...); nlpp is a pointer to the head of the linked
11606 * list of commands (passed by reference), and savelen is the number of
11607 * characters on the top of the stack which must be preserved.
11610 struct nodelist **nlpp;
11613 char *volatile str;
11614 struct jmploc jmploc;
11615 struct jmploc *volatile savehandler;
11617 smallint saveprompt = 0;
11620 (void) &saveprompt;
11622 savepbq = parsebackquote;
11623 if (setjmp(jmploc.loc)) {
11625 parsebackquote = 0;
11626 exception_handler = savehandler;
11627 longjmp(exception_handler->loc, 1);
11631 savelen = out - (char *)stackblock();
11633 str = ckmalloc(savelen);
11634 memcpy(str, stackblock(), savelen);
11636 savehandler = exception_handler;
11637 exception_handler = &jmploc;
11640 /* We must read until the closing backquote, giving special
11641 treatment to some slashes, and then push the string and
11642 reread it as input, interpreting it normally. */
11647 STARTSTACKSTR(pout);
11651 setprompt_if(needprompt, 2);
11660 g_parsefile->linno++;
11661 setprompt_if(doprompt, 2);
11663 * If eating a newline, avoid putting
11664 * the newline into the new character
11665 * stream (via the STPUTC after the
11670 if (pc != '\\' && pc != '`' && pc != '$'
11671 && (!dblquote || pc != '"')
11673 STPUTC('\\', pout);
11675 if (pc <= 255 /* not PEOA or PEOF */) {
11681 IF_ASH_ALIAS(case PEOA:)
11682 startlinno = g_parsefile->linno;
11683 raise_error_syntax("EOF in backquote substitution");
11686 g_parsefile->linno++;
11687 needprompt = doprompt;
11696 STPUTC('\0', pout);
11697 psavelen = pout - (char *)stackblock();
11698 if (psavelen > 0) {
11699 pstr = grabstackstr(pout);
11700 setinputstring(pstr);
11705 nlpp = &(*nlpp)->next;
11706 *nlpp = stzalloc(sizeof(**nlpp));
11707 /* (*nlpp)->next = NULL; - stzalloc did it */
11708 parsebackquote = oldstyle;
11711 saveprompt = doprompt;
11718 doprompt = saveprompt;
11719 else if (readtoken() != TRP)
11720 raise_error_unexpected_syntax(TRP);
11725 * Start reading from old file again, ignoring any pushed back
11726 * tokens left from the backquote parsing
11731 while (stackblocksize() <= savelen)
11733 STARTSTACKSTR(out);
11735 memcpy(out, str, savelen);
11736 STADJUST(savelen, out);
11742 parsebackquote = savepbq;
11743 exception_handler = savehandler;
11744 if (arinest || dblquote)
11745 USTPUTC(CTLBACKQ | CTLQUOTE, out);
11747 USTPUTC(CTLBACKQ, out);
11749 goto parsebackq_oldreturn;
11750 goto parsebackq_newreturn;
11753 #if ENABLE_SH_MATH_SUPPORT
11755 * Parse an arithmetic expansion (indicate start of one and set state)
11758 if (++arinest == 1) {
11759 prevsyntax = syntax;
11760 syntax = ARISYNTAX;
11761 USTPUTC(CTLARI, out);
11768 * we collapse embedded arithmetic expansion to
11769 * parenthesis, which should be equivalent
11773 goto parsearith_return;
11777 } /* end of readtoken */
11780 * Read the next input token.
11781 * If the token is a word, we set backquotelist to the list of cmds in
11782 * backquotes. We set quoteflag to true if any part of the word was
11784 * If the token is TREDIR, then we set redirnode to a structure containing
11786 * In all cases, the variable startlinno is set to the number of the line
11787 * on which the token starts.
11789 * [Change comment: here documents and internal procedures]
11790 * [Readtoken shouldn't have any arguments. Perhaps we should make the
11791 * word parsing code into a separate routine. In this case, readtoken
11792 * doesn't need to have any internal procedures, but parseword does.
11793 * We could also make parseoperator in essence the main routine, and
11794 * have parseword (readtoken1?) handle both words and redirection.]
11796 #define NEW_xxreadtoken
11797 #ifdef NEW_xxreadtoken
11798 /* singles must be first! */
11799 static const char xxreadtoken_chars[7] ALIGN1 = {
11800 '\n', '(', ')', /* singles */
11801 '&', '|', ';', /* doubles */
11805 #define xxreadtoken_singles 3
11806 #define xxreadtoken_doubles 3
11808 static const char xxreadtoken_tokens[] ALIGN1 = {
11809 TNL, TLP, TRP, /* only single occurrence allowed */
11810 TBACKGND, TPIPE, TSEMI, /* if single occurrence */
11811 TEOF, /* corresponds to trailing nul */
11812 TAND, TOR, TENDCASE /* if double occurrence */
11824 setprompt_if(needprompt, 2);
11825 startlinno = g_parsefile->linno;
11826 for (;;) { /* until token or start of word found */
11828 if (c == ' ' || c == '\t' IF_ASH_ALIAS( || c == PEOA))
11832 while ((c = pgetc()) != '\n' && c != PEOF)
11835 } else if (c == '\\') {
11836 if (pgetc() != '\n') {
11838 break; /* return readtoken1(...) */
11840 startlinno = ++g_parsefile->linno;
11841 setprompt_if(doprompt, 2);
11845 p = xxreadtoken_chars + sizeof(xxreadtoken_chars) - 1;
11848 g_parsefile->linno++;
11849 needprompt = doprompt;
11852 p = strchr(xxreadtoken_chars, c);
11854 break; /* return readtoken1(...) */
11856 if ((int)(p - xxreadtoken_chars) >= xxreadtoken_singles) {
11858 if (cc == c) { /* double occurrence? */
11859 p += xxreadtoken_doubles + 1;
11862 #if ENABLE_ASH_BASH_COMPAT
11863 if (c == '&' && cc == '>') /* &> */
11864 break; /* return readtoken1(...) */
11869 lasttoken = xxreadtoken_tokens[p - xxreadtoken_chars];
11874 return readtoken1(c, BASESYNTAX, (char *) NULL, 0);
11876 #else /* old xxreadtoken */
11877 #define RETURN(token) return lasttoken = token
11887 setprompt_if(needprompt, 2);
11888 startlinno = g_parsefile->linno;
11889 for (;;) { /* until token or start of word found */
11892 case ' ': case '\t':
11893 IF_ASH_ALIAS(case PEOA:)
11896 while ((c = pgetc()) != '\n' && c != PEOF)
11901 if (pgetc() == '\n') {
11902 startlinno = ++g_parsefile->linno;
11903 setprompt_if(doprompt, 2);
11909 g_parsefile->linno++;
11910 needprompt = doprompt;
11915 if (pgetc() == '&')
11920 if (pgetc() == '|')
11925 if (pgetc() == ';')
11938 return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
11941 #endif /* old xxreadtoken */
11948 smallint alreadyseen = tokpushback;
11951 #if ENABLE_ASH_ALIAS
11960 if (checkkwd & CHKNL) {
11967 if (t != TWORD || quoteflag) {
11972 * check for keywords
11974 if (checkkwd & CHKKWD) {
11975 const char *const *pp;
11977 pp = findkwd(wordtext);
11979 lasttoken = t = pp - tokname_array;
11980 TRACE(("keyword '%s' recognized\n", tokname_array[t] + 1));
11985 if (checkkwd & CHKALIAS) {
11986 #if ENABLE_ASH_ALIAS
11988 ap = lookupalias(wordtext, 1);
11991 pushstring(ap->val, ap);
12001 TRACE(("token '%s' %s\n", tokname_array[t] + 1, t == TWORD ? wordtext : ""));
12003 TRACE(("reread token '%s' %s\n", tokname_array[t] + 1, t == TWORD ? wordtext : ""));
12015 return tokname_array[t][0];
12019 * Read and parse a command. Returns NODE_EOF on end of file.
12020 * (NULL is a valid parse tree indicating a blank line.)
12022 static union node *
12023 parsecmd(int interact)
12028 doprompt = interact;
12029 setprompt_if(doprompt, doprompt);
12041 * Input any here documents.
12046 struct heredoc *here;
12049 here = heredoclist;
12050 heredoclist = NULL;
12053 setprompt_if(needprompt, 2);
12054 readtoken1(pgetc(), here->here->type == NHERE ? SQSYNTAX : DQSYNTAX,
12055 here->eofmark, here->striptabs);
12056 n = stzalloc(sizeof(struct narg));
12057 n->narg.type = NARG;
12058 /*n->narg.next = NULL; - stzalloc did it */
12059 n->narg.text = wordtext;
12060 n->narg.backquote = backquotelist;
12061 here->here->nhere.doc = n;
12068 * called by editline -- any expansions to the prompt should be added here.
12070 #if ENABLE_ASH_EXPAND_PRMT
12071 static const char *
12072 expandstr(const char *ps)
12076 /* XXX Fix (char *) cast. It _is_ a bug. ps is variable's value,
12077 * and token processing _can_ alter it (delete NULs etc). */
12078 setinputstring((char *)ps);
12079 readtoken1(pgetc(), PSSYNTAX, nullstr, 0);
12082 n.narg.type = NARG;
12083 n.narg.next = NULL;
12084 n.narg.text = wordtext;
12085 n.narg.backquote = backquotelist;
12087 expandarg(&n, NULL, 0);
12088 return stackblock();
12093 * Execute a command or commands contained in a string.
12096 evalstring(char *s, int mask)
12099 struct stackmark smark;
12103 setstackmark(&smark);
12106 while ((n = parsecmd(0)) != NODE_EOF) {
12108 popstackmark(&smark);
12121 * The eval command.
12123 static int FAST_FUNC
12124 evalcmd(int argc UNUSED_PARAM, char **argv)
12133 STARTSTACKSTR(concat);
12135 concat = stack_putstr(p, concat);
12139 STPUTC(' ', concat);
12141 STPUTC('\0', concat);
12142 p = grabstackstr(concat);
12144 evalstring(p, ~SKIPEVAL);
12150 * Read and execute commands.
12151 * "Top" is nonzero for the top level command loop;
12152 * it turns on prompting if the shell is interactive.
12158 struct stackmark smark;
12162 TRACE(("cmdloop(%d) called\n", top));
12166 setstackmark(&smark);
12169 showjobs(stderr, SHOW_CHANGED);
12172 if (iflag && top) {
12176 n = parsecmd(inter);
12178 if (DEBUG > 2 && debug && (n != NODE_EOF))
12181 if (n == NODE_EOF) {
12182 if (!top || numeof >= 50)
12184 if (!stoppedjobs()) {
12187 out2str("\nUse \"exit\" to leave shell.\n");
12190 } else if (nflag == 0) {
12191 /* job_warning can only be 2,1,0. Here 2->1, 1/0->0 */
12196 popstackmark(&smark);
12201 return skip & SKIPEVAL;
12208 * Take commands from a file. To be compatible we should do a path
12209 * search for the file, which is necessary to find sub-commands.
12212 find_dot_file(char *name)
12215 const char *path = pathval();
12218 /* don't try this for absolute or relative paths */
12219 if (strchr(name, '/'))
12222 /* IIRC standards do not say whether . is to be searched.
12223 * And it is even smaller this way, making it unconditional for now:
12225 if (1) { /* ENABLE_ASH_BASH_COMPAT */
12230 while ((fullname = path_advance(&path, name)) != NULL) {
12232 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
12234 * Don't bother freeing here, since it will
12235 * be freed by the caller.
12239 if (fullname != name)
12240 stunalloc(fullname);
12243 /* not found in the PATH */
12244 ash_msg_and_raise_error("%s: not found", name);
12248 static int FAST_FUNC
12249 dotcmd(int argc, char **argv)
12252 struct strlist *sp;
12253 volatile struct shparam saveparam;
12255 for (sp = cmdenviron; sp; sp = sp->next)
12256 setvareq(ckstrdup(sp->text), VSTRFIXED | VTEXTFIXED);
12259 /* bash says: "bash: .: filename argument required" */
12260 return 2; /* bash compat */
12263 /* "false; . empty_file; echo $?" should print 0, not 1: */
12266 fullname = find_dot_file(argv[1]);
12270 if (argc) { /* argc > 0, argv[0] != NULL */
12271 saveparam = shellparam;
12272 shellparam.malloced = 0;
12273 shellparam.nparam = argc;
12274 shellparam.p = argv;
12277 setinputfile(fullname, INPUT_PUSH_FILE);
12278 commandname = fullname;
12283 freeparam(&shellparam);
12284 shellparam = saveparam;
12290 static int FAST_FUNC
12291 exitcmd(int argc UNUSED_PARAM, char **argv)
12296 exitstatus = number(argv[1]);
12297 raise_exception(EXEXIT);
12302 * Read a file containing shell functions.
12305 readcmdfile(char *name)
12307 setinputfile(name, INPUT_PUSH_FILE);
12313 /* ============ find_command inplementation */
12316 * Resolve a command name. If you change this routine, you may have to
12317 * change the shellexec routine as well.
12320 find_command(char *name, struct cmdentry *entry, int act, const char *path)
12322 struct tblentry *cmdp;
12329 struct builtincmd *bcmd;
12331 /* If name contains a slash, don't use PATH or hash table */
12332 if (strchr(name, '/') != NULL) {
12333 entry->u.index = -1;
12334 if (act & DO_ABS) {
12335 while (stat(name, &statb) < 0) {
12337 if (errno == EINTR)
12340 entry->cmdtype = CMDUNKNOWN;
12344 entry->cmdtype = CMDNORMAL;
12348 /* #if ENABLE_FEATURE_SH_STANDALONE... moved after builtin check */
12350 updatetbl = (path == pathval());
12353 if (strstr(path, "%builtin") != NULL)
12354 act |= DO_ALTBLTIN;
12357 /* If name is in the table, check answer will be ok */
12358 cmdp = cmdlookup(name, 0);
12359 if (cmdp != NULL) {
12362 switch (cmdp->cmdtype) {
12380 } else if (cmdp->rehash == 0)
12381 /* if not invalidated by cd, we're done */
12385 /* If %builtin not in path, check for builtin next */
12386 bcmd = find_builtin(name);
12388 if (IS_BUILTIN_REGULAR(bcmd))
12389 goto builtin_success;
12390 if (act & DO_ALTPATH) {
12391 if (!(act & DO_ALTBLTIN))
12392 goto builtin_success;
12393 } else if (builtinloc <= 0) {
12394 goto builtin_success;
12398 #if ENABLE_FEATURE_SH_STANDALONE
12400 int applet_no = find_applet_by_name(name);
12401 if (applet_no >= 0) {
12402 entry->cmdtype = CMDNORMAL;
12403 entry->u.index = -2 - applet_no;
12409 /* We have to search path. */
12410 prev = -1; /* where to start */
12411 if (cmdp && cmdp->rehash) { /* doing a rehash */
12412 if (cmdp->cmdtype == CMDBUILTIN)
12415 prev = cmdp->param.index;
12421 while ((fullname = path_advance(&path, name)) != NULL) {
12422 stunalloc(fullname);
12423 /* NB: code below will still use fullname
12424 * despite it being "unallocated" */
12427 if (prefix(pathopt, "builtin")) {
12429 goto builtin_success;
12432 if ((act & DO_NOFUNC)
12433 || !prefix(pathopt, "func")
12434 ) { /* ignore unimplemented options */
12438 /* if rehash, don't redo absolute path names */
12439 if (fullname[0] == '/' && idx <= prev) {
12442 TRACE(("searchexec \"%s\": no change\n", name));
12445 while (stat(fullname, &statb) < 0) {
12447 if (errno == EINTR)
12450 if (errno != ENOENT && errno != ENOTDIR)
12454 e = EACCES; /* if we fail, this will be the error */
12455 if (!S_ISREG(statb.st_mode))
12457 if (pathopt) { /* this is a %func directory */
12458 stalloc(strlen(fullname) + 1);
12459 /* NB: stalloc will return space pointed by fullname
12460 * (because we don't have any intervening allocations
12461 * between stunalloc above and this stalloc) */
12462 readcmdfile(fullname);
12463 cmdp = cmdlookup(name, 0);
12464 if (cmdp == NULL || cmdp->cmdtype != CMDFUNCTION)
12465 ash_msg_and_raise_error("%s not defined in %s", name, fullname);
12466 stunalloc(fullname);
12469 TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
12471 entry->cmdtype = CMDNORMAL;
12472 entry->u.index = idx;
12476 cmdp = cmdlookup(name, 1);
12477 cmdp->cmdtype = CMDNORMAL;
12478 cmdp->param.index = idx;
12483 /* We failed. If there was an entry for this command, delete it */
12484 if (cmdp && updatetbl)
12485 delete_cmd_entry();
12487 ash_msg("%s: %s", name, errmsg(e, "not found"));
12488 entry->cmdtype = CMDUNKNOWN;
12493 entry->cmdtype = CMDBUILTIN;
12494 entry->u.cmd = bcmd;
12498 cmdp = cmdlookup(name, 1);
12499 cmdp->cmdtype = CMDBUILTIN;
12500 cmdp->param.cmd = bcmd;
12504 entry->cmdtype = cmdp->cmdtype;
12505 entry->u = cmdp->param;
12509 /* ============ trap.c */
12512 * The trap builtin.
12514 static int FAST_FUNC
12515 trapcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12519 int signo, exitcode;
12524 for (signo = 0; signo < NSIG; signo++) {
12525 char *tr = trap_ptr[signo];
12527 /* note: bash adds "SIG", but only if invoked
12528 * as "bash". If called as "sh", or if set -o posix,
12529 * then it prints short signal names.
12530 * We are printing short names: */
12531 out1fmt("trap -- %s %s\n",
12533 get_signame(signo));
12534 /* trap_ptr != trap only if we are in special-cased `trap` code.
12535 * In this case, we will exit very soon, no need to free(). */
12536 /* if (trap_ptr != trap && tp[0]) */
12541 if (trap_ptr != trap) {
12554 signo = get_signum(*ap);
12556 /* Mimic bash message exactly */
12557 ash_msg("%s: invalid signal specification", *ap);
12563 if (LONE_DASH(action))
12566 action = ckstrdup(action);
12570 may_have_traps = 1;
12571 trap[signo] = action;
12582 /* ============ Builtins */
12584 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
12586 * Lists available builtins
12588 static int FAST_FUNC
12589 helpcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12595 "Built-in commands:\n"
12596 "------------------\n");
12597 for (col = 0, i = 0; i < ARRAY_SIZE(builtintab); i++) {
12598 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '),
12599 builtintab[i].name + 1);
12605 #if ENABLE_FEATURE_SH_STANDALONE
12607 const char *a = applet_names;
12609 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '), a);
12614 a += strlen(a) + 1;
12619 return EXIT_SUCCESS;
12621 #endif /* FEATURE_SH_EXTRA_QUIET */
12624 * The export and readonly commands.
12626 static int FAST_FUNC
12627 exportcmd(int argc UNUSED_PARAM, char **argv)
12637 /* "readonly" in bash accepts, but ignores -n.
12638 * We do the same: it saves a conditional in nextopt's param.
12641 while ((opt = nextopt("np")) != '\0') {
12643 flag_off = VEXPORT;
12646 if (argv[0][0] == 'r') {
12648 flag_off = 0; /* readonly ignores -n */
12650 flag_off = ~flag_off;
12652 /*if (opt_p_not_specified) - bash doesnt check this. Try "export -p NAME" */
12658 p = strchr(name, '=');
12662 vp = *findvar(hashvar(name), name);
12664 vp->flags = ((vp->flags | flag) & flag_off);
12668 setvar(name, p, (flag & flag_off));
12669 } while ((name = *++aptr) != NULL);
12674 /* No arguments. Show the list of exported or readonly vars.
12677 showvars(argv[0], flag, 0);
12682 * Delete a function if it exists.
12685 unsetfunc(const char *name)
12687 struct tblentry *cmdp;
12689 cmdp = cmdlookup(name, 0);
12690 if (cmdp != NULL && cmdp->cmdtype == CMDFUNCTION)
12691 delete_cmd_entry();
12695 * The unset builtin command. We unset the function before we unset the
12696 * variable to allow a function to be unset when there is a readonly variable
12697 * with the same name.
12699 static int FAST_FUNC
12700 unsetcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12707 while ((i = nextopt("vf")) != 0) {
12711 for (ap = argptr; *ap; ap++) {
12724 static const unsigned char timescmd_str[] ALIGN1 = {
12725 ' ', offsetof(struct tms, tms_utime),
12726 '\n', offsetof(struct tms, tms_stime),
12727 ' ', offsetof(struct tms, tms_cutime),
12728 '\n', offsetof(struct tms, tms_cstime),
12731 static int FAST_FUNC
12732 timescmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12734 unsigned long clk_tck, s, t;
12735 const unsigned char *p;
12738 clk_tck = sysconf(_SC_CLK_TCK);
12743 t = *(clock_t *)(((char *) &buf) + p[1]);
12746 out1fmt("%lum%lu.%03lus%c",
12748 (t * 1000) / clk_tck,
12756 #if ENABLE_SH_MATH_SUPPORT
12758 * The let builtin. Partially stolen from GNU Bash, the Bourne Again SHell.
12759 * Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
12761 * Copyright (C) 2003 Vladimir Oleynik <dzo@simtreas.ru>
12763 static int FAST_FUNC
12764 letcmd(int argc UNUSED_PARAM, char **argv)
12770 ash_msg_and_raise_error("expression expected");
12772 i = ash_arith(*argv);
12780 * The read builtin. Options:
12781 * -r Do not interpret '\' specially
12782 * -s Turn off echo (tty only)
12783 * -n NCHARS Read NCHARS max
12784 * -p PROMPT Display PROMPT on stderr (if input is from tty)
12785 * -t SECONDS Timeout after SECONDS (tty or pipe only)
12786 * -u FD Read from given FD instead of fd 0
12787 * This uses unbuffered input, which may be avoidable in some cases.
12788 * TODO: bash also has:
12789 * -a ARRAY Read into array[0],[1],etc
12790 * -d DELIM End on DELIM char, not newline
12791 * -e Use line editing (tty only)
12793 static int FAST_FUNC
12794 readcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12796 char *opt_n = NULL;
12797 char *opt_p = NULL;
12798 char *opt_t = NULL;
12799 char *opt_u = NULL;
12800 int read_flags = 0;
12804 while ((i = nextopt("p:u:rt:n:s")) != '\0') {
12813 read_flags |= BUILTIN_READ_SILENT;
12819 read_flags |= BUILTIN_READ_RAW;
12829 /* "read -s" needs to save/restore termios, can't allow ^C
12830 * to jump out of it.
12833 r = shell_builtin_read(setvar2,
12835 bltinlookup("IFS"), /* can be NULL */
12844 if ((uintptr_t)r > 1)
12845 ash_msg_and_raise_error(r);
12847 return (uintptr_t)r;
12850 static int FAST_FUNC
12851 umaskcmd(int argc UNUSED_PARAM, char **argv)
12853 static const char permuser[3] ALIGN1 = "ugo";
12854 static const char permmode[3] ALIGN1 = "rwx";
12855 static const short permmask[] ALIGN2 = {
12856 S_IRUSR, S_IWUSR, S_IXUSR,
12857 S_IRGRP, S_IWGRP, S_IXGRP,
12858 S_IROTH, S_IWOTH, S_IXOTH
12861 /* TODO: use bb_parse_mode() instead */
12866 int symbolic_mode = 0;
12868 while (nextopt("S") != '\0') {
12879 if (symbolic_mode) {
12883 for (i = 0; i < 3; i++) {
12886 *p++ = permuser[i];
12888 for (j = 0; j < 3; j++) {
12889 if ((mask & permmask[3 * i + j]) == 0) {
12890 *p++ = permmode[j];
12898 out1fmt("%.4o\n", mask);
12901 if (isdigit((unsigned char) *ap)) {
12904 if (*ap >= '8' || *ap < '0')
12905 ash_msg_and_raise_error(msg_illnum, argv[1]);
12906 mask = (mask << 3) + (*ap - '0');
12907 } while (*++ap != '\0');
12910 mask = ~mask & 0777;
12911 if (!bb_parse_mode(ap, &mask)) {
12912 ash_msg_and_raise_error("illegal mode: %s", ap);
12914 umask(~mask & 0777);
12920 static int FAST_FUNC
12921 ulimitcmd(int argc UNUSED_PARAM, char **argv)
12923 return shell_builtin_ulimit(argv);
12926 /* ============ main() and helpers */
12929 * Called to exit the shell.
12938 #if ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
12939 save_history(line_input_state);
12942 status = exitstatus;
12943 TRACE(("pid %d, exitshell(%d)\n", getpid(), status));
12944 if (setjmp(loc.loc)) {
12945 if (exception_type == EXEXIT)
12946 /* dash bug: it just does _exit(exitstatus) here
12947 * but we have to do setjobctl(0) first!
12948 * (bug is still not fixed in dash-0.5.3 - if you run dash
12949 * under Midnight Commander, on exit from dash MC is backgrounded) */
12950 status = exitstatus;
12953 exception_handler = &loc;
12960 flush_stdout_stderr();
12970 /* from input.c: */
12971 /* we will never free this */
12972 basepf.next_to_pgetc = basepf.buf = ckmalloc(IBUFSIZ);
12975 signal(SIGCHLD, SIG_DFL);
12976 /* bash re-enables SIGHUP which is SIG_IGNed on entry.
12977 * Try: "trap '' HUP; bash; echo RET" and type "kill -HUP $$"
12979 signal(SIGHUP, SIG_DFL);
12985 struct stat st1, st2;
12988 for (envp = environ; envp && *envp; envp++) {
12989 if (strchr(*envp, '=')) {
12990 setvareq(*envp, VEXPORT|VTEXTFIXED);
12994 setvar("PPID", utoa(getppid()), 0);
12996 p = lookupvar("PWD");
12998 if (*p != '/' || stat(p, &st1) || stat(".", &st2)
12999 || st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino
13009 //usage:#define ash_trivial_usage
13010 //usage: "[-/+OPTIONS] [-/+o OPT]... [-c 'SCRIPT' [ARG0 [ARGS]] / FILE [ARGS]]"
13011 //usage:#define ash_full_usage "\n\n"
13012 //usage: "Unix shell interpreter"
13014 //usage:#if ENABLE_FEATURE_SH_IS_ASH
13015 //usage:# define sh_trivial_usage ash_trivial_usage
13016 //usage:# define sh_full_usage ash_full_usage
13018 //usage:#if ENABLE_FEATURE_BASH_IS_ASH
13019 //usage:# define bash_trivial_usage ash_trivial_usage
13020 //usage:# define bash_full_usage ash_full_usage
13024 * Process the shell command line arguments.
13027 procargs(char **argv)
13030 const char *xminusc;
13035 /* if (xargv[0]) - mmm, this is always true! */
13037 for (i = 0; i < NOPTS; i++)
13040 if (options(/*cmdline:*/ 1)) {
13041 /* it already printed err message */
13042 raise_exception(EXERROR);
13046 if (*xargv == NULL) {
13048 ash_msg_and_raise_error(bb_msg_requires_arg, "-c");
13051 if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
13055 for (i = 0; i < NOPTS; i++)
13056 if (optlist[i] == 2)
13061 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
13066 } else if (!sflag) {
13067 setinputfile(*xargv, 0);
13070 commandname = arg0;
13073 shellparam.p = xargv;
13074 #if ENABLE_ASH_GETOPTS
13075 shellparam.optind = 1;
13076 shellparam.optoff = -1;
13078 /* assert(shellparam.malloced == 0 && shellparam.nparam == 0); */
13080 shellparam.nparam++;
13087 * Read /etc/profile or .profile.
13090 read_profile(const char *name)
13094 if (setinputfile(name, INPUT_PUSH_FILE | INPUT_NOFILE_OK) < 0)
13103 * This routine is called when an error or an interrupt occurs in an
13104 * interactive shell and control is returned to the main command loop.
13112 /* from input.c: */
13113 g_parsefile->left_in_buffer = 0;
13114 g_parsefile->left_in_line = 0; /* clear input buffer */
13116 /* from parser.c: */
13119 /* from redir.c: */
13120 clearredir(/*drop:*/ 0);
13124 static short profile_buf[16384];
13125 extern int etext();
13129 * Main routine. We initialize things, parse the arguments, execute
13130 * profiles if we're a login shell, and then call cmdloop to execute
13131 * commands. The setjmp call sets up the location to jump to when an
13132 * exception occurs. When an exception occurs the variable "state"
13133 * is used to figure out how far we had gotten.
13135 int ash_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
13136 int ash_main(int argc UNUSED_PARAM, char **argv)
13138 const char *shinit;
13139 volatile smallint state;
13140 struct jmploc jmploc;
13141 struct stackmark smark;
13143 /* Initialize global data */
13147 #if ENABLE_ASH_ALIAS
13153 monitor(4, etext, profile_buf, sizeof(profile_buf), 50);
13156 #if ENABLE_FEATURE_EDITING
13157 line_input_state = new_line_input_t(FOR_SHELL | WITH_PATH_LOOKUP);
13160 if (setjmp(jmploc.loc)) {
13166 e = exception_type;
13170 if (e == EXEXIT || s == 0 || iflag == 0 || shlvl) {
13174 outcslow('\n', stderr);
13177 popstackmark(&smark);
13178 FORCE_INT_ON; /* enable interrupts */
13187 exception_handler = &jmploc;
13190 TRACE(("Shell args: "));
13191 trace_puts_args(argv);
13193 rootpid = getpid();
13196 setstackmark(&smark);
13199 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
13201 const char *hp = lookupvar("HISTFILE");
13203 hp = lookupvar("HOME");
13205 char *defhp = concat_path_file(hp, ".ash_history");
13206 setvar("HISTFILE", defhp, 0);
13212 if (argv[0] && argv[0][0] == '-')
13216 read_profile("/etc/profile");
13219 read_profile(".profile");
13225 getuid() == geteuid() && getgid() == getegid() &&
13229 shinit = lookupvar("ENV");
13230 if (shinit != NULL && *shinit != '\0') {
13231 read_profile(shinit);
13237 /* evalstring pushes parsefile stack.
13238 * Ensure we don't falsely claim that 0 (stdin)
13239 * is one of stacked source fds.
13240 * Testcase: ash -c 'exec 1>&0' must not complain. */
13241 // if (!sflag) g_parsefile->pf_fd = -1;
13242 // ^^ not necessary since now we special-case fd 0
13243 // in is_hidden_fd() to not be considered "hidden fd"
13244 evalstring(minusc, 0);
13247 if (sflag || minusc == NULL) {
13248 #if MAX_HISTORY > 0 && ENABLE_FEATURE_EDITING_SAVEHISTORY
13250 const char *hp = lookupvar("HISTFILE");
13252 line_input_state->hist_file = hp;
13253 # if ENABLE_FEATURE_SH_HISTFILESIZE
13254 hp = lookupvar("HISTFILESIZE");
13255 line_input_state->max_history = size_from_HISTFILESIZE(hp);
13259 state4: /* XXX ??? - why isn't this before the "if" statement */
13267 extern void _mcleanup(void);
13271 TRACE(("End of main reached\n"));
13278 * Copyright (c) 1989, 1991, 1993, 1994
13279 * The Regents of the University of California. All rights reserved.
13281 * This code is derived from software contributed to Berkeley by
13282 * Kenneth Almquist.
13284 * Redistribution and use in source and binary forms, with or without
13285 * modification, are permitted provided that the following conditions
13287 * 1. Redistributions of source code must retain the above copyright
13288 * notice, this list of conditions and the following disclaimer.
13289 * 2. Redistributions in binary form must reproduce the above copyright
13290 * notice, this list of conditions and the following disclaimer in the
13291 * documentation and/or other materials provided with the distribution.
13292 * 3. Neither the name of the University nor the names of its contributors
13293 * may be used to endorse or promote products derived from this software
13294 * without specific prior written permission.
13296 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
13297 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
13298 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
13299 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
13300 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
13301 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
13302 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
13303 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
13304 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
13305 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF