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, debugging info will be written to ./trace and
27 * a quit signal will generate a core dump.
30 /* Tweak debug output verbosity here */
37 #define JOBS ENABLE_ASH_JOB_CONTROL
42 #include <sys/times.h>
44 #include "busybox.h" /* for applet_names */
47 #include "shell_common.h"
48 #if ENABLE_SH_MATH_SUPPORT
51 #if ENABLE_ASH_RANDOM_SUPPORT
54 # define CLEAR_RANDOM_T(rnd) ((void)0)
57 #include "NUM_APPLETS.h"
59 /* STANDALONE does not make sense, and won't compile */
60 # undef CONFIG_FEATURE_SH_STANDALONE
61 # undef ENABLE_FEATURE_SH_STANDALONE
62 # undef IF_FEATURE_SH_STANDALONE
63 # undef IF_NOT_FEATURE_SH_STANDALONE
64 # define ENABLE_FEATURE_SH_STANDALONE 0
65 # define IF_FEATURE_SH_STANDALONE(...)
66 # define IF_NOT_FEATURE_SH_STANDALONE(...) __VA_ARGS__
70 # define PIPE_BUF 4096 /* amount of buffering in a pipe */
74 # error "Do not even bother, ash will not run on NOMMU machine"
80 //config: depends on !NOMMU
82 //config: Tha 'ash' shell adds about 60k in the default configuration and is
83 //config: the most complete and most pedantically correct shell included with
84 //config: busybox. This shell is actually a derivative of the Debian 'dash'
85 //config: shell (by Herbert Xu), which was created by porting the 'ash' shell
86 //config: (written by Kenneth Almquist) from NetBSD.
88 //config:config ASH_BASH_COMPAT
89 //config: bool "bash-compatible extensions"
91 //config: depends on ASH
93 //config: Enable bash-compatible extensions.
95 //config:config ASH_IDLE_TIMEOUT
96 //config: bool "Idle timeout variable"
98 //config: depends on ASH
100 //config: Enables bash-like auto-logout after $TMOUT seconds of idle time.
102 //config:config ASH_JOB_CONTROL
103 //config: bool "Job control"
105 //config: depends on ASH
107 //config: Enable job control in the ash shell.
109 //config:config ASH_ALIAS
110 //config: bool "Alias support"
112 //config: depends on ASH
114 //config: Enable alias support in the ash shell.
116 //config:config ASH_GETOPTS
117 //config: bool "Builtin getopt to parse positional parameters"
119 //config: depends on ASH
121 //config: Enable support for getopts builtin in ash.
123 //config:config ASH_BUILTIN_ECHO
124 //config: bool "Builtin version of 'echo'"
126 //config: depends on ASH
128 //config: Enable support for echo builtin in ash.
130 //config:config ASH_BUILTIN_PRINTF
131 //config: bool "Builtin version of 'printf'"
133 //config: depends on ASH
135 //config: Enable support for printf builtin in ash.
137 //config:config ASH_BUILTIN_TEST
138 //config: bool "Builtin version of 'test'"
140 //config: depends on ASH
142 //config: Enable support for test builtin in ash.
144 //config:config ASH_CMDCMD
145 //config: bool "'command' command to override shell builtins"
147 //config: depends on ASH
149 //config: Enable support for the ash 'command' builtin, which allows
150 //config: you to run the specified command with the specified arguments,
151 //config: even when there is an ash builtin command with the same name.
153 //config:config ASH_MAIL
154 //config: bool "Check for new mail on interactive shells"
156 //config: depends on ASH
158 //config: Enable "check for new mail" function in the ash shell.
160 //config:config ASH_OPTIMIZE_FOR_SIZE
161 //config: bool "Optimize for size instead of speed"
163 //config: depends on ASH
165 //config: Compile ash for reduced size at the price of speed.
167 //config:config ASH_RANDOM_SUPPORT
168 //config: bool "Pseudorandom generator and $RANDOM variable"
170 //config: depends on ASH
172 //config: Enable pseudorandom generator and dynamic variable "$RANDOM".
173 //config: Each read of "$RANDOM" will generate a new pseudorandom value.
174 //config: You can reset the generator by using a specified start value.
175 //config: After "unset RANDOM" the generator will switch off and this
176 //config: variable will no longer have special treatment.
178 //config:config ASH_EXPAND_PRMT
179 //config: bool "Expand prompt string"
181 //config: depends on ASH
183 //config: "PS#" may contain volatile content, such as backquote commands.
184 //config: This option recreates the prompt string from the environment
185 //config: variable each time it is displayed.
188 //applet:IF_ASH(APPLET(ash, BB_DIR_BIN, BB_SUID_DROP))
189 //applet:IF_FEATURE_SH_IS_ASH(APPLET_ODDNAME(sh, ash, BB_DIR_BIN, BB_SUID_DROP, sh))
190 //applet:IF_FEATURE_BASH_IS_ASH(APPLET_ODDNAME(bash, ash, BB_DIR_BIN, BB_SUID_DROP, bash))
192 //kbuild:lib-$(CONFIG_ASH) += ash.o ash_ptr_hack.o shell_common.o
193 //kbuild:lib-$(CONFIG_ASH_RANDOM_SUPPORT) += random.o
196 /* ============ Hash table sizes. Configurable. */
200 #define CMDTABLESIZE 31 /* should be prime */
203 /* ============ Shell options */
205 static const char *const optletters_optnames[] = {
220 #if ENABLE_ASH_BASH_COMPAT
229 #define optletters(n) optletters_optnames[n][0]
230 #define optnames(n) (optletters_optnames[n] + 1)
232 enum { NOPTS = ARRAY_SIZE(optletters_optnames) };
235 /* ============ Misc data */
237 #define msg_illnum "Illegal number: %s"
240 * We enclose jmp_buf in a structure so that we can declare pointers to
241 * jump locations. The global variable handler contains the location to
242 * jump to when an exception occurs, and the global variable exception_type
243 * contains a code identifying the exception. To implement nested
244 * exception handlers, the user should save the value of handler on entry
245 * to an inner scope, set handler to point to a jmploc structure for the
246 * inner scope, and restore handler on exit from the scope.
252 struct globals_misc {
253 /* pid of main shell */
255 /* shell level: 0 for the main shell, 1 for its children, and so on */
257 #define rootshell (!shlvl)
258 char *minusc; /* argument to -c option */
260 char *curdir; // = nullstr; /* current working directory */
261 char *physdir; // = nullstr; /* physical working directory */
263 char *arg0; /* value of $0 */
265 struct jmploc *exception_handler;
267 volatile int suppress_int; /* counter */
268 volatile /*sig_atomic_t*/ smallint pending_int; /* 1 = got SIGINT */
269 /* last pending signal */
270 volatile /*sig_atomic_t*/ smallint pending_sig;
271 smallint exception_type; /* kind of exception (0..5) */
273 #define EXINT 0 /* SIGINT received */
274 #define EXERROR 1 /* a generic error */
275 #define EXSHELLPROC 2 /* execute a shell procedure */
276 #define EXEXEC 3 /* command execution failed */
277 #define EXEXIT 4 /* exit the shell */
278 #define EXSIG 5 /* trapped signal in wait(1) */
281 char nullstr[1]; /* zero length string */
284 #define eflag optlist[0]
285 #define fflag optlist[1]
286 #define Iflag optlist[2]
287 #define iflag optlist[3]
288 #define mflag optlist[4]
289 #define nflag optlist[5]
290 #define sflag optlist[6]
291 #define xflag optlist[7]
292 #define vflag optlist[8]
293 #define Cflag optlist[9]
294 #define aflag optlist[10]
295 #define bflag optlist[11]
296 #define uflag optlist[12]
297 #define viflag optlist[13]
298 #if ENABLE_ASH_BASH_COMPAT
299 # define pipefail optlist[14]
304 # define nolog optlist[14 + ENABLE_ASH_BASH_COMPAT]
305 # define debug optlist[15 + ENABLE_ASH_BASH_COMPAT]
308 /* trap handler commands */
310 * Sigmode records the current value of the signal handlers for the various
311 * modes. A value of zero means that the current handler is not known.
312 * S_HARD_IGN indicates that the signal was ignored on entry to the shell.
314 char sigmode[NSIG - 1];
315 #define S_DFL 1 /* default signal handling (SIG_DFL) */
316 #define S_CATCH 2 /* signal is caught */
317 #define S_IGN 3 /* signal is ignored (SIG_IGN) */
318 #define S_HARD_IGN 4 /* signal is ignored permenantly */
320 /* indicates specified signal received */
321 uint8_t gotsig[NSIG - 1]; /* offset by 1: "signal" 0 is meaningless */
322 uint8_t may_have_traps; /* 0: definitely no traps are set, 1: some traps may be set */
324 char **trap_ptr; /* used only by "trap hack" */
326 /* Rarely referenced stuff */
327 #if ENABLE_ASH_RANDOM_SUPPORT
330 pid_t backgndpid; /* pid of last background process */
331 smallint job_warning; /* user was warned about stopped jobs (can be 2, 1 or 0). */
333 extern struct globals_misc *const ash_ptr_to_globals_misc;
334 #define G_misc (*ash_ptr_to_globals_misc)
335 #define rootpid (G_misc.rootpid )
336 #define shlvl (G_misc.shlvl )
337 #define minusc (G_misc.minusc )
338 #define curdir (G_misc.curdir )
339 #define physdir (G_misc.physdir )
340 #define arg0 (G_misc.arg0 )
341 #define exception_handler (G_misc.exception_handler)
342 #define exception_type (G_misc.exception_type )
343 #define suppress_int (G_misc.suppress_int )
344 #define pending_int (G_misc.pending_int )
345 #define pending_sig (G_misc.pending_sig )
346 #define isloginsh (G_misc.isloginsh )
347 #define nullstr (G_misc.nullstr )
348 #define optlist (G_misc.optlist )
349 #define sigmode (G_misc.sigmode )
350 #define gotsig (G_misc.gotsig )
351 #define may_have_traps (G_misc.may_have_traps )
352 #define trap (G_misc.trap )
353 #define trap_ptr (G_misc.trap_ptr )
354 #define random_gen (G_misc.random_gen )
355 #define backgndpid (G_misc.backgndpid )
356 #define job_warning (G_misc.job_warning)
357 #define INIT_G_misc() do { \
358 (*(struct globals_misc**)&ash_ptr_to_globals_misc) = xzalloc(sizeof(G_misc)); \
366 /* ============ DEBUG */
368 static void trace_printf(const char *fmt, ...);
369 static void trace_vprintf(const char *fmt, va_list va);
370 # define TRACE(param) trace_printf param
371 # define TRACEV(param) trace_vprintf param
372 # define close(fd) do { \
374 if (close(dfd) < 0) \
375 bb_error_msg("bug on %d: closing %d(0x%x)", \
376 __LINE__, dfd, dfd); \
379 # define TRACE(param)
380 # define TRACEV(param)
384 /* ============ Utility functions */
385 #define xbarrier() do { __asm__ __volatile__ ("": : :"memory"); } while (0)
387 static int isdigit_str9(const char *str)
389 int maxlen = 9 + 1; /* max 9 digits: 999999999 */
390 while (--maxlen && isdigit(*str))
392 return (*str == '\0');
395 static const char *var_end(const char *var)
404 /* ============ Interrupts / exceptions */
406 static void exitshell(void) NORETURN;
409 * These macros allow the user to suspend the handling of interrupt signals
410 * over a period of time. This is similar to SIGHOLD or to sigblock, but
411 * much more efficient and portable. (But hacking the kernel is so much
412 * more fun than worrying about efficiency and portability. :-))
414 #define INT_OFF do { \
420 * Called to raise an exception. Since C doesn't include exceptions, we
421 * just do a longjmp to the exception handler. The type of exception is
422 * stored in the global variable "exception_type".
424 static void raise_exception(int) NORETURN;
426 raise_exception(int e)
429 if (exception_handler == NULL)
434 longjmp(exception_handler->loc, 1);
437 #define raise_exception(e) do { \
438 TRACE(("raising exception %d on line %d\n", (e), __LINE__)); \
439 raise_exception(e); \
444 * Called from trap.c when a SIGINT is received. (If the user specifies
445 * that SIGINT is to be trapped or ignored using the trap builtin, then
446 * this routine is not called.) Suppressint is nonzero when interrupts
447 * are held using the INT_OFF macro. (The test for iflag is just
448 * defensive programming.)
450 static void raise_interrupt(void) NORETURN;
452 raise_interrupt(void)
457 /* Signal is not automatically unmasked after it is raised,
458 * do it ourself - unmask all signals */
459 sigprocmask_allsigs(SIG_UNBLOCK);
460 /* pending_sig = 0; - now done in signal_handler() */
463 if (gotsig[SIGINT - 1] && !trap[SIGINT]) {
464 if (!(rootshell && iflag)) {
465 /* Kill ourself with SIGINT */
466 signal(SIGINT, SIG_DFL);
471 raise_exception(ex_type);
475 #define raise_interrupt() do { \
476 TRACE(("raising interrupt on line %d\n", __LINE__)); \
481 static IF_ASH_OPTIMIZE_FOR_SIZE(inline) void
485 if (--suppress_int == 0 && pending_int) {
489 #define INT_ON int_on()
490 static IF_ASH_OPTIMIZE_FOR_SIZE(inline) void
498 #define FORCE_INT_ON force_int_on()
500 #define SAVE_INT(v) ((v) = suppress_int)
502 #define RESTORE_INT(v) do { \
504 suppress_int = (v); \
505 if (suppress_int == 0 && pending_int) \
510 /* ============ Stdout/stderr output */
513 outstr(const char *p, FILE *file)
521 flush_stdout_stderr(void)
529 outcslow(int c, FILE *dest)
537 static int out1fmt(const char *, ...) __attribute__((__format__(__printf__,1,2)));
539 out1fmt(const char *fmt, ...)
546 r = vprintf(fmt, ap);
552 static int fmtstr(char *, size_t, const char *, ...) __attribute__((__format__(__printf__,3,4)));
554 fmtstr(char *outbuf, size_t length, const char *fmt, ...)
561 ret = vsnprintf(outbuf, length, fmt, ap);
568 out1str(const char *p)
574 out2str(const char *p)
577 flush_stdout_stderr();
581 /* ============ Parser structures */
583 /* control characters in argument strings */
584 #define CTL_FIRST CTLESC
585 #define CTLESC ((unsigned char)'\201') /* escape next character */
586 #define CTLVAR ((unsigned char)'\202') /* variable defn */
587 #define CTLENDVAR ((unsigned char)'\203')
588 #define CTLBACKQ ((unsigned char)'\204')
589 #define CTLQUOTE 01 /* ored with CTLBACKQ code if in quotes */
590 /* CTLBACKQ | CTLQUOTE == '\205' */
591 #define CTLARI ((unsigned char)'\206') /* arithmetic expression */
592 #define CTLENDARI ((unsigned char)'\207')
593 #define CTLQUOTEMARK ((unsigned char)'\210')
594 #define CTL_LAST CTLQUOTEMARK
596 /* variable substitution byte (follows CTLVAR) */
597 #define VSTYPE 0x0f /* type of variable substitution */
598 #define VSNUL 0x10 /* colon--treat the empty string as unset */
599 #define VSQUOTE 0x80 /* inside double quotes--suppress splitting */
601 /* values of VSTYPE field */
602 #define VSNORMAL 0x1 /* normal variable: $var or ${var} */
603 #define VSMINUS 0x2 /* ${var-text} */
604 #define VSPLUS 0x3 /* ${var+text} */
605 #define VSQUESTION 0x4 /* ${var?message} */
606 #define VSASSIGN 0x5 /* ${var=text} */
607 #define VSTRIMRIGHT 0x6 /* ${var%pattern} */
608 #define VSTRIMRIGHTMAX 0x7 /* ${var%%pattern} */
609 #define VSTRIMLEFT 0x8 /* ${var#pattern} */
610 #define VSTRIMLEFTMAX 0x9 /* ${var##pattern} */
611 #define VSLENGTH 0xa /* ${#var} */
612 #if ENABLE_ASH_BASH_COMPAT
613 #define VSSUBSTR 0xc /* ${var:position:length} */
614 #define VSREPLACE 0xd /* ${var/pattern/replacement} */
615 #define VSREPLACEALL 0xe /* ${var//pattern/replacement} */
618 static const char dolatstr[] ALIGN1 = {
619 CTLVAR, VSNORMAL|VSQUOTE, '@', '=', '\0'
639 #if ENABLE_ASH_BASH_COMPAT
656 smallint type; /* Nxxxx */
659 union node *redirect;
664 smallint pipe_backgnd;
665 struct nodelist *cmdlist;
671 union node *redirect;
684 union node *elsepart;
711 struct nodelist *backquote;
714 /* nfile and ndup layout must match!
715 * NTOFD (>&fdnum) uses ndup structure, but we may discover mid-flight
716 * that it is actually NTO2 (>&file), and change its type.
733 char *_unused_expfname;
752 struct nredir nredir;
753 struct nbinary nbinary;
757 struct nclist nclist;
766 * NODE_EOF is returned by parsecmd when it encounters an end of file.
767 * It must be distinct from NULL.
769 #define NODE_EOF ((union node *) -1L)
772 struct nodelist *next;
785 freefunc(struct funcnode *f)
787 if (f && --f->count < 0)
792 /* ============ Debugging output */
796 static FILE *tracefile;
799 trace_printf(const char *fmt, ...)
806 fprintf(tracefile, "%u ", (int) time(NULL));
808 fprintf(tracefile, "[%u] ", (int) getpid());
810 fprintf(tracefile, "pending s:%d i:%d(supp:%d) ", pending_sig, pending_int, suppress_int);
812 vfprintf(tracefile, fmt, va);
817 trace_vprintf(const char *fmt, va_list va)
822 fprintf(tracefile, "%u ", (int) time(NULL));
824 fprintf(tracefile, "[%u] ", (int) getpid());
826 fprintf(tracefile, "pending s:%d i:%d(supp:%d) ", pending_sig, pending_int, suppress_int);
827 vfprintf(tracefile, fmt, va);
831 trace_puts(const char *s)
839 trace_puts_quoted(char *s)
846 putc('"', tracefile);
847 for (p = s; *p; p++) {
848 switch ((unsigned char)*p) {
849 case '\n': c = 'n'; goto backslash;
850 case '\t': c = 't'; goto backslash;
851 case '\r': c = 'r'; goto backslash;
852 case '\"': c = '\"'; goto backslash;
853 case '\\': c = '\\'; goto backslash;
854 case CTLESC: c = 'e'; goto backslash;
855 case CTLVAR: c = 'v'; goto backslash;
856 case CTLVAR+CTLQUOTE: c = 'V'; goto backslash;
857 case CTLBACKQ: c = 'q'; goto backslash;
858 case CTLBACKQ+CTLQUOTE: c = 'Q'; goto backslash;
860 putc('\\', tracefile);
864 if (*p >= ' ' && *p <= '~')
867 putc('\\', tracefile);
868 putc((*p >> 6) & 03, tracefile);
869 putc((*p >> 3) & 07, tracefile);
870 putc(*p & 07, tracefile);
875 putc('"', tracefile);
879 trace_puts_args(char **ap)
886 trace_puts_quoted(*ap);
888 putc('\n', tracefile);
891 putc(' ', tracefile);
906 /* leave open because libedit might be using it */
909 strcpy(s, "./trace");
911 if (!freopen(s, "a", tracefile)) {
912 fprintf(stderr, "Can't re-open %s\n", s);
917 tracefile = fopen(s, "a");
918 if (tracefile == NULL) {
919 fprintf(stderr, "Can't open %s\n", s);
925 flags = fcntl(fileno(tracefile), F_GETFL);
927 fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND);
929 setlinebuf(tracefile);
930 fputs("\nTracing started.\n", tracefile);
934 indent(int amount, char *pfx, FILE *fp)
938 for (i = 0; i < amount; i++) {
939 if (pfx && i == amount - 1)
945 /* little circular references here... */
946 static void shtree(union node *n, int ind, char *pfx, FILE *fp);
949 sharg(union node *arg, FILE *fp)
952 struct nodelist *bqlist;
953 unsigned char subtype;
955 if (arg->type != NARG) {
956 out1fmt("<node type %d>\n", arg->type);
959 bqlist = arg->narg.backquote;
960 for (p = arg->narg.text; *p; p++) {
961 switch ((unsigned char)*p) {
970 if (subtype == VSLENGTH)
981 switch (subtype & VSTYPE) {
1007 case VSTRIMRIGHTMAX:
1014 out1fmt("<subtype %d>", subtype);
1021 case CTLBACKQ|CTLQUOTE:
1024 shtree(bqlist->n, -1, NULL, fp);
1035 shcmd(union node *cmd, FILE *fp)
1043 for (np = cmd->ncmd.args; np; np = np->narg.next) {
1049 for (np = cmd->ncmd.redirect; np; np = np->nfile.next) {
1053 switch (np->nfile.type) {
1054 case NTO: s = ">>"+1; dftfd = 1; break;
1055 case NCLOBBER: s = ">|"; dftfd = 1; break;
1056 case NAPPEND: s = ">>"; dftfd = 1; break;
1057 #if ENABLE_ASH_BASH_COMPAT
1060 case NTOFD: s = ">&"; dftfd = 1; break;
1061 case NFROM: s = "<"; break;
1062 case NFROMFD: s = "<&"; break;
1063 case NFROMTO: s = "<>"; break;
1064 default: s = "*error*"; break;
1066 if (np->nfile.fd != dftfd)
1067 fprintf(fp, "%d", np->nfile.fd);
1069 if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) {
1070 fprintf(fp, "%d", np->ndup.dupfd);
1072 sharg(np->nfile.fname, fp);
1079 shtree(union node *n, int ind, char *pfx, FILE *fp)
1081 struct nodelist *lp;
1087 indent(ind, pfx, fp);
1089 if (n == NODE_EOF) {
1104 shtree(n->nbinary.ch1, ind, NULL, fp);
1107 shtree(n->nbinary.ch2, ind, NULL, fp);
1115 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
1116 shtree(lp->n, 0, NULL, fp);
1120 if (n->npipe.pipe_backgnd)
1126 fprintf(fp, "<node type %d>", n->type);
1134 showtree(union node *n)
1136 trace_puts("showtree called\n");
1137 shtree(n, 1, NULL, stderr);
1143 /* ============ Parser data */
1146 * ash_vmsg() needs parsefile->fd, hence parsefile definition is moved up.
1149 struct strlist *next;
1156 struct strpush *prev; /* preceding string on stack */
1158 int prev_left_in_line;
1159 #if ENABLE_ASH_ALIAS
1160 struct alias *ap; /* if push was associated with an alias */
1162 char *string; /* remember the string since it may change */
1166 struct parsefile *prev; /* preceding file on stack */
1167 int linno; /* current line */
1168 int pf_fd; /* file descriptor (or -1 if string) */
1169 int left_in_line; /* number of chars left in this line */
1170 int left_in_buffer; /* number of chars left in this buffer past the line */
1171 char *next_to_pgetc; /* next char in buffer */
1172 char *buf; /* input buffer */
1173 struct strpush *strpush; /* for pushing strings at this level */
1174 struct strpush basestrpush; /* so pushing one is fast */
1177 static struct parsefile basepf; /* top level input file */
1178 static struct parsefile *g_parsefile = &basepf; /* current input file */
1179 static int startlinno; /* line # where last token started */
1180 static char *commandname; /* currently executing command */
1181 static struct strlist *cmdenviron; /* environment for builtin command */
1182 static uint8_t exitstatus; /* exit status of last command */
1185 /* ============ Message printing */
1188 ash_vmsg(const char *msg, va_list ap)
1190 fprintf(stderr, "%s: ", arg0);
1192 if (strcmp(arg0, commandname))
1193 fprintf(stderr, "%s: ", commandname);
1194 if (!iflag || g_parsefile->pf_fd > 0)
1195 fprintf(stderr, "line %d: ", startlinno);
1197 vfprintf(stderr, msg, ap);
1198 outcslow('\n', stderr);
1202 * Exverror is called to raise the error exception. If the second argument
1203 * is not NULL then error prints an error message using printf style
1204 * formatting. It then raises the error exception.
1206 static void ash_vmsg_and_raise(int, const char *, va_list) NORETURN;
1208 ash_vmsg_and_raise(int cond, const char *msg, va_list ap)
1212 TRACE(("ash_vmsg_and_raise(%d, \"", cond));
1214 TRACE(("\") pid=%d\n", getpid()));
1216 TRACE(("ash_vmsg_and_raise(%d, NULL) pid=%d\n", cond, getpid()));
1221 flush_stdout_stderr();
1222 raise_exception(cond);
1226 static void ash_msg_and_raise_error(const char *, ...) NORETURN;
1228 ash_msg_and_raise_error(const char *msg, ...)
1233 ash_vmsg_and_raise(EXERROR, msg, ap);
1238 static void raise_error_syntax(const char *) NORETURN;
1240 raise_error_syntax(const char *msg)
1242 ash_msg_and_raise_error("syntax error: %s", msg);
1246 static void ash_msg_and_raise(int, const char *, ...) NORETURN;
1248 ash_msg_and_raise(int cond, const char *msg, ...)
1253 ash_vmsg_and_raise(cond, msg, ap);
1259 * error/warning routines for external builtins
1262 ash_msg(const char *fmt, ...)
1272 * Return a string describing an error. The returned string may be a
1273 * pointer to a static buffer that will be overwritten on the next call.
1274 * Action describes the operation that got the error.
1277 errmsg(int e, const char *em)
1279 if (e == ENOENT || e == ENOTDIR) {
1286 /* ============ Memory allocation */
1289 /* I consider these wrappers nearly useless:
1290 * ok, they return you to nearest exception handler, but
1291 * how much memory do you leak in the process, making
1292 * memory starvation worse?
1295 ckrealloc(void * p, size_t nbytes)
1297 p = realloc(p, nbytes);
1299 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1304 ckmalloc(size_t nbytes)
1306 return ckrealloc(NULL, nbytes);
1310 ckzalloc(size_t nbytes)
1312 return memset(ckmalloc(nbytes), 0, nbytes);
1316 ckstrdup(const char *s)
1318 char *p = strdup(s);
1320 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1324 /* Using bbox equivalents. They exit if out of memory */
1325 # define ckrealloc xrealloc
1326 # define ckmalloc xmalloc
1327 # define ckzalloc xzalloc
1328 # define ckstrdup xstrdup
1332 * It appears that grabstackstr() will barf with such alignments
1333 * because stalloc() will return a string allocated in a new stackblock.
1335 #define SHELL_ALIGN(nbytes) (((nbytes) + SHELL_SIZE) & ~SHELL_SIZE)
1337 /* Most machines require the value returned from malloc to be aligned
1338 * in some way. The following macro will get this right
1339 * on many machines. */
1340 SHELL_SIZE = sizeof(union { int i; char *cp; double d; }) - 1,
1341 /* Minimum size of a block */
1342 MINSIZE = SHELL_ALIGN(504),
1345 struct stack_block {
1346 struct stack_block *prev;
1347 char space[MINSIZE];
1351 struct stack_block *stackp;
1354 struct stackmark *marknext;
1358 struct globals_memstack {
1359 struct stack_block *g_stackp; // = &stackbase;
1360 struct stackmark *markp;
1361 char *g_stacknxt; // = stackbase.space;
1362 char *sstrend; // = stackbase.space + MINSIZE;
1363 size_t g_stacknleft; // = MINSIZE;
1364 int herefd; // = -1;
1365 struct stack_block stackbase;
1367 extern struct globals_memstack *const ash_ptr_to_globals_memstack;
1368 #define G_memstack (*ash_ptr_to_globals_memstack)
1369 #define g_stackp (G_memstack.g_stackp )
1370 #define markp (G_memstack.markp )
1371 #define g_stacknxt (G_memstack.g_stacknxt )
1372 #define sstrend (G_memstack.sstrend )
1373 #define g_stacknleft (G_memstack.g_stacknleft)
1374 #define herefd (G_memstack.herefd )
1375 #define stackbase (G_memstack.stackbase )
1376 #define INIT_G_memstack() do { \
1377 (*(struct globals_memstack**)&ash_ptr_to_globals_memstack) = xzalloc(sizeof(G_memstack)); \
1379 g_stackp = &stackbase; \
1380 g_stacknxt = stackbase.space; \
1381 g_stacknleft = MINSIZE; \
1382 sstrend = stackbase.space + MINSIZE; \
1387 #define stackblock() ((void *)g_stacknxt)
1388 #define stackblocksize() g_stacknleft
1391 * Parse trees for commands are allocated in lifo order, so we use a stack
1392 * to make this more efficient, and also to avoid all sorts of exception
1393 * handling code to handle interrupts in the middle of a parse.
1395 * The size 504 was chosen because the Ultrix malloc handles that size
1399 stalloc(size_t nbytes)
1404 aligned = SHELL_ALIGN(nbytes);
1405 if (aligned > g_stacknleft) {
1408 struct stack_block *sp;
1410 blocksize = aligned;
1411 if (blocksize < MINSIZE)
1412 blocksize = MINSIZE;
1413 len = sizeof(struct stack_block) - MINSIZE + blocksize;
1414 if (len < blocksize)
1415 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1418 sp->prev = g_stackp;
1419 g_stacknxt = sp->space;
1420 g_stacknleft = blocksize;
1421 sstrend = g_stacknxt + blocksize;
1426 g_stacknxt += aligned;
1427 g_stacknleft -= aligned;
1432 stzalloc(size_t nbytes)
1434 return memset(stalloc(nbytes), 0, nbytes);
1441 if (!p || (g_stacknxt < (char *)p) || ((char *)p < g_stackp->space)) {
1442 write(STDERR_FILENO, "stunalloc\n", 10);
1446 g_stacknleft += g_stacknxt - (char *)p;
1451 * Like strdup but works with the ash stack.
1454 ststrdup(const char *p)
1456 size_t len = strlen(p) + 1;
1457 return memcpy(stalloc(len), p, len);
1461 setstackmark(struct stackmark *mark)
1463 mark->stackp = g_stackp;
1464 mark->stacknxt = g_stacknxt;
1465 mark->stacknleft = g_stacknleft;
1466 mark->marknext = markp;
1471 popstackmark(struct stackmark *mark)
1473 struct stack_block *sp;
1479 markp = mark->marknext;
1480 while (g_stackp != mark->stackp) {
1482 g_stackp = sp->prev;
1485 g_stacknxt = mark->stacknxt;
1486 g_stacknleft = mark->stacknleft;
1487 sstrend = mark->stacknxt + mark->stacknleft;
1492 * When the parser reads in a string, it wants to stick the string on the
1493 * stack and only adjust the stack pointer when it knows how big the
1494 * string is. Stackblock (defined in stack.h) returns a pointer to a block
1495 * of space on top of the stack and stackblocklen returns the length of
1496 * this block. Growstackblock will grow this space by at least one byte,
1497 * possibly moving it (like realloc). Grabstackblock actually allocates the
1498 * part of the block that has been used.
1501 growstackblock(void)
1505 newlen = g_stacknleft * 2;
1506 if (newlen < g_stacknleft)
1507 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1511 if (g_stacknxt == g_stackp->space && g_stackp != &stackbase) {
1512 struct stack_block *oldstackp;
1513 struct stackmark *xmark;
1514 struct stack_block *sp;
1515 struct stack_block *prevstackp;
1519 oldstackp = g_stackp;
1521 prevstackp = sp->prev;
1522 grosslen = newlen + sizeof(struct stack_block) - MINSIZE;
1523 sp = ckrealloc(sp, grosslen);
1524 sp->prev = prevstackp;
1526 g_stacknxt = sp->space;
1527 g_stacknleft = newlen;
1528 sstrend = sp->space + newlen;
1531 * Stack marks pointing to the start of the old block
1532 * must be relocated to point to the new block
1535 while (xmark != NULL && xmark->stackp == oldstackp) {
1536 xmark->stackp = g_stackp;
1537 xmark->stacknxt = g_stacknxt;
1538 xmark->stacknleft = g_stacknleft;
1539 xmark = xmark->marknext;
1543 char *oldspace = g_stacknxt;
1544 size_t oldlen = g_stacknleft;
1545 char *p = stalloc(newlen);
1547 /* free the space we just allocated */
1548 g_stacknxt = memcpy(p, oldspace, oldlen);
1549 g_stacknleft += newlen;
1554 grabstackblock(size_t len)
1556 len = SHELL_ALIGN(len);
1558 g_stacknleft -= len;
1562 * The following routines are somewhat easier to use than the above.
1563 * The user declares a variable of type STACKSTR, which may be declared
1564 * to be a register. The macro STARTSTACKSTR initializes things. Then
1565 * the user uses the macro STPUTC to add characters to the string. In
1566 * effect, STPUTC(c, p) is the same as *p++ = c except that the stack is
1567 * grown as necessary. When the user is done, she can just leave the
1568 * string there and refer to it using stackblock(). Or she can allocate
1569 * the space for it using grabstackstr(). If it is necessary to allow
1570 * someone else to use the stack temporarily and then continue to grow
1571 * the string, the user should use grabstack to allocate the space, and
1572 * then call ungrabstr(p) to return to the previous mode of operation.
1574 * USTPUTC is like STPUTC except that it doesn't check for overflow.
1575 * CHECKSTACKSPACE can be called before USTPUTC to ensure that there
1576 * is space for at least one character.
1581 size_t len = stackblocksize();
1582 if (herefd >= 0 && len >= 1024) {
1583 full_write(herefd, stackblock(), len);
1584 return stackblock();
1587 return (char *)stackblock() + len;
1591 * Called from CHECKSTRSPACE.
1594 makestrspace(size_t newlen, char *p)
1596 size_t len = p - g_stacknxt;
1597 size_t size = stackblocksize();
1602 size = stackblocksize();
1604 if (nleft >= newlen)
1608 return (char *)stackblock() + len;
1612 stack_nputstr(const char *s, size_t n, char *p)
1614 p = makestrspace(n, p);
1615 p = (char *)memcpy(p, s, n) + n;
1620 stack_putstr(const char *s, char *p)
1622 return stack_nputstr(s, strlen(s), p);
1626 _STPUTC(int c, char *p)
1634 #define STARTSTACKSTR(p) ((p) = stackblock())
1635 #define STPUTC(c, p) ((p) = _STPUTC((c), (p)))
1636 #define CHECKSTRSPACE(n, p) do { \
1639 size_t m = sstrend - q; \
1641 (p) = makestrspace(l, q); \
1643 #define USTPUTC(c, p) (*(p)++ = (c))
1644 #define STACKSTRNUL(p) do { \
1645 if ((p) == sstrend) \
1646 (p) = growstackstr(); \
1649 #define STUNPUTC(p) (--(p))
1650 #define STTOPC(p) ((p)[-1])
1651 #define STADJUST(amount, p) ((p) += (amount))
1653 #define grabstackstr(p) stalloc((char *)(p) - (char *)stackblock())
1654 #define ungrabstackstr(s, p) stunalloc(s)
1655 #define stackstrend() ((void *)sstrend)
1658 /* ============ String helpers */
1661 * prefix -- see if pfx is a prefix of string.
1664 prefix(const char *string, const char *pfx)
1667 if (*pfx++ != *string++)
1670 return (char *) string;
1674 * Check for a valid number. This should be elsewhere.
1677 is_number(const char *p)
1682 } while (*++p != '\0');
1687 * Convert a string of digits to an integer, printing an error message on
1691 number(const char *s)
1694 ash_msg_and_raise_error(msg_illnum, s);
1699 * Produce a possibly single quoted string suitable as input to the shell.
1700 * The return string is allocated on the stack.
1703 single_quote(const char *s)
1713 len = strchrnul(s, '\'') - s;
1715 q = p = makestrspace(len + 3, p);
1718 q = (char *)memcpy(q, s, len) + len;
1727 do len++; while (*++s == '\'');
1729 q = p = makestrspace(len + 3, p);
1732 q = (char *)memcpy(q, s - len, len) + len;
1740 return stackblock();
1744 /* ============ nextopt */
1746 static char **argptr; /* argument list for builtin commands */
1747 static char *optionarg; /* set by nextopt (like getopt) */
1748 static char *optptr; /* used by nextopt */
1751 * XXX - should get rid of. Have all builtins use getopt(3).
1752 * The library getopt must have the BSD extension static variable
1753 * "optreset", otherwise it can't be used within the shell safely.
1755 * Standard option processing (a la getopt) for builtin routines.
1756 * The only argument that is passed to nextopt is the option string;
1757 * the other arguments are unnecessary. It returns the character,
1758 * or '\0' on end of input.
1761 nextopt(const char *optstring)
1768 if (p == NULL || *p == '\0') {
1769 /* We ate entire "-param", take next one */
1775 if (*++p == '\0') /* just "-" ? */
1778 if (LONE_DASH(p)) /* "--" ? */
1780 /* p => next "-param" */
1782 /* p => some option char in the middle of a "-param" */
1784 for (q = optstring; *q != c;) {
1786 ash_msg_and_raise_error("illegal option -%c", c);
1794 ash_msg_and_raise_error("no arg for -%c option", c);
1804 /* ============ Shell variables */
1807 * The parsefile structure pointed to by the global variable parsefile
1808 * contains information about the current file being read.
1811 int nparam; /* # of positional parameters (without $0) */
1812 #if ENABLE_ASH_GETOPTS
1813 int optind; /* next parameter to be processed by getopts */
1814 int optoff; /* used by getopts */
1816 unsigned char malloced; /* if parameter list dynamically allocated */
1817 char **p; /* parameter list */
1821 * Free the list of positional parameters.
1824 freeparam(volatile struct shparam *param)
1826 if (param->malloced) {
1828 ap = ap1 = param->p;
1835 #if ENABLE_ASH_GETOPTS
1836 static void FAST_FUNC getoptsreset(const char *value);
1840 struct var *next; /* next entry in hash list */
1841 int flags; /* flags are defined above */
1842 const char *var_text; /* name=value */
1843 void (*var_func)(const char *) FAST_FUNC; /* function to be called when */
1844 /* the variable gets set/unset */
1848 struct localvar *next; /* next local variable in list */
1849 struct var *vp; /* the variable that was made local */
1850 int flags; /* saved flags */
1851 const char *text; /* saved text */
1855 #define VEXPORT 0x01 /* variable is exported */
1856 #define VREADONLY 0x02 /* variable cannot be modified */
1857 #define VSTRFIXED 0x04 /* variable struct is statically allocated */
1858 #define VTEXTFIXED 0x08 /* text is statically allocated */
1859 #define VSTACK 0x10 /* text is allocated on the stack */
1860 #define VUNSET 0x20 /* the variable is not set */
1861 #define VNOFUNC 0x40 /* don't call the callback function */
1862 #define VNOSET 0x80 /* do not set variable - just readonly test */
1863 #define VNOSAVE 0x100 /* when text is on the heap before setvareq */
1864 #if ENABLE_ASH_RANDOM_SUPPORT
1865 # define VDYNAMIC 0x200 /* dynamic variable */
1871 /* Need to be before varinit_data[] */
1872 #if ENABLE_LOCALE_SUPPORT
1873 static void FAST_FUNC
1874 change_lc_all(const char *value)
1876 if (value && *value != '\0')
1877 setlocale(LC_ALL, value);
1879 static void FAST_FUNC
1880 change_lc_ctype(const char *value)
1882 if (value && *value != '\0')
1883 setlocale(LC_CTYPE, value);
1887 static void chkmail(void);
1888 static void changemail(const char *var_value) FAST_FUNC;
1890 # define chkmail() ((void)0)
1892 static void changepath(const char *) FAST_FUNC;
1893 #if ENABLE_ASH_RANDOM_SUPPORT
1894 static void change_random(const char *) FAST_FUNC;
1897 static const struct {
1899 const char *var_text;
1900 void (*var_func)(const char *) FAST_FUNC;
1901 } varinit_data[] = {
1902 { VSTRFIXED|VTEXTFIXED , defifsvar , NULL },
1904 { VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL" , changemail },
1905 { VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH" , changemail },
1907 { VSTRFIXED|VTEXTFIXED , bb_PATH_root_path, changepath },
1908 { VSTRFIXED|VTEXTFIXED , "PS1=$ " , NULL },
1909 { VSTRFIXED|VTEXTFIXED , "PS2=> " , NULL },
1910 { VSTRFIXED|VTEXTFIXED , "PS4=+ " , NULL },
1911 #if ENABLE_ASH_GETOPTS
1912 { VSTRFIXED|VTEXTFIXED , "OPTIND=1" , getoptsreset },
1914 #if ENABLE_ASH_RANDOM_SUPPORT
1915 { VSTRFIXED|VTEXTFIXED|VUNSET|VDYNAMIC, "RANDOM", change_random },
1917 #if ENABLE_LOCALE_SUPPORT
1918 { VSTRFIXED|VTEXTFIXED|VUNSET, "LC_ALL" , change_lc_all },
1919 { VSTRFIXED|VTEXTFIXED|VUNSET, "LC_CTYPE" , change_lc_ctype },
1921 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
1922 { VSTRFIXED|VTEXTFIXED|VUNSET, "HISTFILE" , NULL },
1928 struct globals_var {
1929 struct shparam shellparam; /* $@ current positional parameters */
1930 struct redirtab *redirlist;
1932 int preverrout_fd; /* save fd2 before print debug if xflag is set. */
1933 struct var *vartab[VTABSIZE];
1934 struct var varinit[ARRAY_SIZE(varinit_data)];
1936 extern struct globals_var *const ash_ptr_to_globals_var;
1937 #define G_var (*ash_ptr_to_globals_var)
1938 #define shellparam (G_var.shellparam )
1939 //#define redirlist (G_var.redirlist )
1940 #define g_nullredirs (G_var.g_nullredirs )
1941 #define preverrout_fd (G_var.preverrout_fd)
1942 #define vartab (G_var.vartab )
1943 #define varinit (G_var.varinit )
1944 #define INIT_G_var() do { \
1946 (*(struct globals_var**)&ash_ptr_to_globals_var) = xzalloc(sizeof(G_var)); \
1948 for (i = 0; i < ARRAY_SIZE(varinit_data); i++) { \
1949 varinit[i].flags = varinit_data[i].flags; \
1950 varinit[i].var_text = varinit_data[i].var_text; \
1951 varinit[i].var_func = varinit_data[i].var_func; \
1955 #define vifs varinit[0]
1957 # define vmail (&vifs)[1]
1958 # define vmpath (&vmail)[1]
1959 # define vpath (&vmpath)[1]
1961 # define vpath (&vifs)[1]
1963 #define vps1 (&vpath)[1]
1964 #define vps2 (&vps1)[1]
1965 #define vps4 (&vps2)[1]
1966 #if ENABLE_ASH_GETOPTS
1967 # define voptind (&vps4)[1]
1968 # if ENABLE_ASH_RANDOM_SUPPORT
1969 # define vrandom (&voptind)[1]
1972 # if ENABLE_ASH_RANDOM_SUPPORT
1973 # define vrandom (&vps4)[1]
1978 * The following macros access the values of the above variables.
1979 * They have to skip over the name. They return the null string
1980 * for unset variables.
1982 #define ifsval() (vifs.var_text + 4)
1983 #define ifsset() ((vifs.flags & VUNSET) == 0)
1985 # define mailval() (vmail.var_text + 5)
1986 # define mpathval() (vmpath.var_text + 9)
1987 # define mpathset() ((vmpath.flags & VUNSET) == 0)
1989 #define pathval() (vpath.var_text + 5)
1990 #define ps1val() (vps1.var_text + 4)
1991 #define ps2val() (vps2.var_text + 4)
1992 #define ps4val() (vps4.var_text + 4)
1993 #if ENABLE_ASH_GETOPTS
1994 # define optindval() (voptind.var_text + 7)
1997 #if ENABLE_ASH_GETOPTS
1998 static void FAST_FUNC
1999 getoptsreset(const char *value)
2001 shellparam.optind = number(value);
2002 shellparam.optoff = -1;
2006 /* math.h has these, otherwise define our private copies */
2007 #if !ENABLE_SH_MATH_SUPPORT
2008 #define is_name(c) ((c) == '_' || isalpha((unsigned char)(c)))
2009 #define is_in_name(c) ((c) == '_' || isalnum((unsigned char)(c)))
2011 * Return the pointer to the first char which is not part of a legal variable name
2012 * (a letter or underscore followed by letters, underscores, and digits).
2015 endofname(const char *name)
2017 if (!is_name(*name))
2020 if (!is_in_name(*name))
2028 * Compares two strings up to the first = or '\0'. The first
2029 * string must be terminated by '='; the second may be terminated by
2030 * either '=' or '\0'.
2033 varcmp(const char *p, const char *q)
2037 while ((c = *p) == (d = *q)) {
2052 * Find the appropriate entry in the hash table from the name.
2054 static struct var **
2055 hashvar(const char *p)
2059 hashval = ((unsigned char) *p) << 4;
2060 while (*p && *p != '=')
2061 hashval += (unsigned char) *p++;
2062 return &vartab[hashval % VTABSIZE];
2066 vpcmp(const void *a, const void *b)
2068 return varcmp(*(const char **)a, *(const char **)b);
2072 * This routine initializes the builtin variables.
2082 * PS1 depends on uid
2084 #if ENABLE_FEATURE_EDITING && ENABLE_FEATURE_EDITING_FANCY_PROMPT
2085 vps1.var_text = "PS1=\\w \\$ ";
2088 vps1.var_text = "PS1=# ";
2091 end = vp + ARRAY_SIZE(varinit);
2093 vpp = hashvar(vp->var_text);
2096 } while (++vp < end);
2099 static struct var **
2100 findvar(struct var **vpp, const char *name)
2102 for (; *vpp; vpp = &(*vpp)->next) {
2103 if (varcmp((*vpp)->var_text, name) == 0) {
2111 * Find the value of a variable. Returns NULL if not set.
2113 static const char* FAST_FUNC
2114 lookupvar(const char *name)
2118 v = *findvar(hashvar(name), name);
2120 #if ENABLE_ASH_RANDOM_SUPPORT
2122 * Dynamic variables are implemented roughly the same way they are
2123 * in bash. Namely, they're "special" so long as they aren't unset.
2124 * As soon as they're unset, they're no longer dynamic, and dynamic
2125 * lookup will no longer happen at that point. -- PFM.
2127 if (v->flags & VDYNAMIC)
2130 if (!(v->flags & VUNSET))
2131 return var_end(v->var_text);
2137 * Search the environment of a builtin command.
2140 bltinlookup(const char *name)
2144 for (sp = cmdenviron; sp; sp = sp->next) {
2145 if (varcmp(sp->text, name) == 0)
2146 return var_end(sp->text);
2148 return lookupvar(name);
2152 * Same as setvar except that the variable and value are passed in
2153 * the first argument as name=value. Since the first argument will
2154 * be actually stored in the table, it should not be a string that
2156 * Called with interrupts off.
2159 setvareq(char *s, int flags)
2161 struct var *vp, **vpp;
2164 flags |= (VEXPORT & (((unsigned) (1 - aflag)) - 1));
2165 vp = *findvar(vpp, s);
2167 if ((vp->flags & (VREADONLY|VDYNAMIC)) == VREADONLY) {
2170 if (flags & VNOSAVE)
2173 ash_msg_and_raise_error("%.*s: is read only", strchrnul(n, '=') - n, n);
2179 if (vp->var_func && !(flags & VNOFUNC))
2180 vp->var_func(var_end(s));
2182 if (!(vp->flags & (VTEXTFIXED|VSTACK)))
2183 free((char*)vp->var_text);
2185 flags |= vp->flags & ~(VTEXTFIXED|VSTACK|VNOSAVE|VUNSET);
2187 /* variable s is not found */
2190 vp = ckzalloc(sizeof(*vp));
2192 /*vp->func = NULL; - ckzalloc did it */
2195 if (!(flags & (VTEXTFIXED|VSTACK|VNOSAVE)))
2202 * Set the value of a variable. The flags argument is ored with the
2203 * flags of the variable. If val is NULL, the variable is unset.
2206 setvar(const char *name, const char *val, int flags)
2214 q = endofname(name);
2215 p = strchrnul(q, '=');
2217 if (!namelen || p != q)
2218 ash_msg_and_raise_error("%.*s: bad variable name", namelen, name);
2223 vallen = strlen(val);
2227 nameeq = ckmalloc(namelen + vallen + 2);
2228 p = memcpy(nameeq, name, namelen) + namelen;
2231 p = memcpy(p, val, vallen) + vallen;
2234 setvareq(nameeq, flags | VNOSAVE);
2238 static void FAST_FUNC
2239 setvar2(const char *name, const char *val)
2241 setvar(name, val, 0);
2244 #if ENABLE_ASH_GETOPTS
2246 * Safe version of setvar, returns 1 on success 0 on failure.
2249 setvarsafe(const char *name, const char *val, int flags)
2252 volatile int saveint;
2253 struct jmploc *volatile savehandler = exception_handler;
2254 struct jmploc jmploc;
2257 if (setjmp(jmploc.loc))
2260 exception_handler = &jmploc;
2261 setvar(name, val, flags);
2264 exception_handler = savehandler;
2265 RESTORE_INT(saveint);
2271 * Unset the specified variable.
2274 unsetvar(const char *s)
2280 vpp = findvar(hashvar(s), s);
2284 int flags = vp->flags;
2287 if (flags & VREADONLY)
2289 #if ENABLE_ASH_RANDOM_SUPPORT
2290 vp->flags &= ~VDYNAMIC;
2294 if ((flags & VSTRFIXED) == 0) {
2296 if ((flags & (VTEXTFIXED|VSTACK)) == 0)
2297 free((char*)vp->var_text);
2303 vp->flags &= ~VEXPORT;
2313 * Process a linked list of variable assignments.
2316 listsetvar(struct strlist *list_set_var, int flags)
2318 struct strlist *lp = list_set_var;
2324 setvareq(lp->text, flags);
2331 * Generate a list of variables satisfying the given conditions.
2334 listvars(int on, int off, char ***end)
2345 for (vp = *vpp; vp; vp = vp->next) {
2346 if ((vp->flags & mask) == on) {
2347 if (ep == stackstrend())
2348 ep = growstackstr();
2349 *ep++ = (char*)vp->var_text;
2352 } while (++vpp < vartab + VTABSIZE);
2353 if (ep == stackstrend())
2354 ep = growstackstr();
2358 return grabstackstr(ep);
2362 /* ============ Path search helper
2364 * The variable path (passed by reference) should be set to the start
2365 * of the path before the first call; path_advance will update
2366 * this value as it proceeds. Successive calls to path_advance will return
2367 * the possible path expansions in sequence. If an option (indicated by
2368 * a percent sign) appears in the path entry then the global variable
2369 * pathopt will be set to point to it; otherwise pathopt will be set to
2372 static const char *pathopt; /* set by path_advance */
2375 path_advance(const char **path, const char *name)
2385 for (p = start; *p && *p != ':' && *p != '%'; p++)
2387 len = p - start + strlen(name) + 2; /* "2" is for '/' and '\0' */
2388 while (stackblocksize() < len)
2392 memcpy(q, start, p - start);
2400 while (*p && *p != ':')
2407 return stalloc(len);
2411 /* ============ Prompt */
2413 static smallint doprompt; /* if set, prompt the user */
2414 static smallint needprompt; /* true if interactive and at start of line */
2416 #if ENABLE_FEATURE_EDITING
2417 static line_input_t *line_input_state;
2418 static const char *cmdedit_prompt;
2420 putprompt(const char *s)
2422 if (ENABLE_ASH_EXPAND_PRMT) {
2423 free((char*)cmdedit_prompt);
2424 cmdedit_prompt = ckstrdup(s);
2431 putprompt(const char *s)
2437 #if ENABLE_ASH_EXPAND_PRMT
2438 /* expandstr() needs parsing machinery, so it is far away ahead... */
2439 static const char *expandstr(const char *ps);
2441 #define expandstr(s) s
2445 setprompt_if(smallint do_set, int whichprompt)
2448 IF_ASH_EXPAND_PRMT(struct stackmark smark;)
2455 switch (whichprompt) {
2465 #if ENABLE_ASH_EXPAND_PRMT
2466 setstackmark(&smark);
2467 stalloc(stackblocksize());
2469 putprompt(expandstr(prompt));
2470 #if ENABLE_ASH_EXPAND_PRMT
2471 popstackmark(&smark);
2476 /* ============ The cd and pwd commands */
2478 #define CD_PHYSICAL 1
2488 while ((i = nextopt("LP")) != '\0') {
2490 flags ^= CD_PHYSICAL;
2499 * Update curdir (the name of the current directory) in response to a
2503 updatepwd(const char *dir)
2510 cdcomppath = ststrdup(dir);
2513 if (curdir == nullstr)
2515 new = stack_putstr(curdir, new);
2517 new = makestrspace(strlen(dir) + 2, new);
2518 lim = (char *)stackblock() + 1;
2522 if (new > lim && *lim == '/')
2527 if (dir[1] == '/' && dir[2] != '/') {
2533 p = strtok(cdcomppath, "/");
2537 if (p[1] == '.' && p[2] == '\0') {
2549 new = stack_putstr(p, new);
2557 return stackblock();
2561 * Find out what the current directory is. If we already know the current
2562 * directory, this routine returns immediately.
2567 char *dir = getcwd(NULL, 0); /* huh, using glibc extension? */
2568 return dir ? dir : nullstr;
2572 setpwd(const char *val, int setold)
2576 oldcur = dir = curdir;
2579 setvar("OLDPWD", oldcur, VEXPORT);
2582 if (physdir != nullstr) {
2583 if (physdir != oldcur)
2587 if (oldcur == val || !val) {
2593 dir = ckstrdup(val);
2594 if (oldcur != dir && oldcur != nullstr) {
2599 setvar("PWD", dir, VEXPORT);
2602 static void hashcd(void);
2605 * Actually do the chdir. We also call hashcd to let the routines in exec.c
2606 * know that the current directory has changed.
2609 docd(const char *dest, int flags)
2611 const char *dir = NULL;
2614 TRACE(("docd(\"%s\", %d) called\n", dest, flags));
2617 if (!(flags & CD_PHYSICAL)) {
2618 dir = updatepwd(dest);
2632 static int FAST_FUNC
2633 cdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
2645 dest = bltinlookup("HOME");
2646 else if (LONE_DASH(dest)) {
2647 dest = bltinlookup("OLDPWD");
2669 path = bltinlookup("CDPATH");
2678 p = path_advance(&path, dest);
2679 if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
2683 if (!docd(p, flags))
2688 ash_msg_and_raise_error("can't cd to %s", dest);
2691 if (flags & CD_PRINT)
2692 out1fmt("%s\n", curdir);
2696 static int FAST_FUNC
2697 pwdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
2700 const char *dir = curdir;
2704 if (physdir == nullstr)
2708 out1fmt("%s\n", dir);
2713 /* ============ ... */
2716 #define IBUFSIZ (ENABLE_FEATURE_EDITING ? CONFIG_FEATURE_EDITING_MAX_LEN : 1024)
2718 /* Syntax classes */
2719 #define CWORD 0 /* character is nothing special */
2720 #define CNL 1 /* newline character */
2721 #define CBACK 2 /* a backslash character */
2722 #define CSQUOTE 3 /* single quote */
2723 #define CDQUOTE 4 /* double quote */
2724 #define CENDQUOTE 5 /* a terminating quote */
2725 #define CBQUOTE 6 /* backwards single quote */
2726 #define CVAR 7 /* a dollar sign */
2727 #define CENDVAR 8 /* a '}' character */
2728 #define CLP 9 /* a left paren in arithmetic */
2729 #define CRP 10 /* a right paren in arithmetic */
2730 #define CENDFILE 11 /* end of file */
2731 #define CCTL 12 /* like CWORD, except it must be escaped */
2732 #define CSPCL 13 /* these terminate a word */
2733 #define CIGN 14 /* character should be ignored */
2736 #if ENABLE_ASH_ALIAS
2740 #define USE_SIT_FUNCTION ENABLE_ASH_OPTIMIZE_FOR_SIZE
2742 #if ENABLE_SH_MATH_SUPPORT
2743 # define SIT_ITEM(a,b,c,d) (a | (b << 4) | (c << 8) | (d << 12))
2745 # define SIT_ITEM(a,b,c,d) (a | (b << 4) | (c << 8))
2747 static const uint16_t S_I_T[] = {
2748 #if ENABLE_ASH_ALIAS
2749 SIT_ITEM(CSPCL , CIGN , CIGN , CIGN ), /* 0, PEOA */
2751 SIT_ITEM(CSPCL , CWORD , CWORD, CWORD ), /* 1, ' ' */
2752 SIT_ITEM(CNL , CNL , CNL , CNL ), /* 2, \n */
2753 SIT_ITEM(CWORD , CCTL , CCTL , CWORD ), /* 3, !*-/:=?[]~ */
2754 SIT_ITEM(CDQUOTE , CENDQUOTE, CWORD, CWORD ), /* 4, '"' */
2755 SIT_ITEM(CVAR , CVAR , CWORD, CVAR ), /* 5, $ */
2756 SIT_ITEM(CSQUOTE , CWORD , CENDQUOTE, CWORD), /* 6, "'" */
2757 SIT_ITEM(CSPCL , CWORD , CWORD, CLP ), /* 7, ( */
2758 SIT_ITEM(CSPCL , CWORD , CWORD, CRP ), /* 8, ) */
2759 SIT_ITEM(CBACK , CBACK , CCTL , CBACK ), /* 9, \ */
2760 SIT_ITEM(CBQUOTE , CBQUOTE , CWORD, CBQUOTE), /* 10, ` */
2761 SIT_ITEM(CENDVAR , CENDVAR , CWORD, CENDVAR), /* 11, } */
2762 #if !USE_SIT_FUNCTION
2763 SIT_ITEM(CENDFILE, CENDFILE , CENDFILE, CENDFILE),/* 12, PEOF */
2764 SIT_ITEM(CWORD , CWORD , CWORD, CWORD ), /* 13, 0-9A-Za-z */
2765 SIT_ITEM(CCTL , CCTL , CCTL , CCTL ) /* 14, CTLESC ... */
2769 /* Constants below must match table above */
2771 #if ENABLE_ASH_ALIAS
2772 CSPCL_CIGN_CIGN_CIGN , /* 0 */
2774 CSPCL_CWORD_CWORD_CWORD , /* 1 */
2775 CNL_CNL_CNL_CNL , /* 2 */
2776 CWORD_CCTL_CCTL_CWORD , /* 3 */
2777 CDQUOTE_CENDQUOTE_CWORD_CWORD , /* 4 */
2778 CVAR_CVAR_CWORD_CVAR , /* 5 */
2779 CSQUOTE_CWORD_CENDQUOTE_CWORD , /* 6 */
2780 CSPCL_CWORD_CWORD_CLP , /* 7 */
2781 CSPCL_CWORD_CWORD_CRP , /* 8 */
2782 CBACK_CBACK_CCTL_CBACK , /* 9 */
2783 CBQUOTE_CBQUOTE_CWORD_CBQUOTE , /* 10 */
2784 CENDVAR_CENDVAR_CWORD_CENDVAR , /* 11 */
2785 CENDFILE_CENDFILE_CENDFILE_CENDFILE, /* 12 */
2786 CWORD_CWORD_CWORD_CWORD , /* 13 */
2787 CCTL_CCTL_CCTL_CCTL , /* 14 */
2790 /* c in SIT(c, syntax) must be an *unsigned char* or PEOA or PEOF,
2791 * caller must ensure proper cast on it if c is *char_ptr!
2793 /* Values for syntax param */
2794 #define BASESYNTAX 0 /* not in quotes */
2795 #define DQSYNTAX 1 /* in double quotes */
2796 #define SQSYNTAX 2 /* in single quotes */
2797 #define ARISYNTAX 3 /* in arithmetic */
2798 #define PSSYNTAX 4 /* prompt. never passed to SIT() */
2800 #if USE_SIT_FUNCTION
2803 SIT(int c, int syntax)
2805 static const char spec_symbls[] ALIGN1 = "\t\n !\"$&'()*-/:;<=>?[\\]`|}~";
2806 # if ENABLE_ASH_ALIAS
2807 static const uint8_t syntax_index_table[] ALIGN1 = {
2808 1, 2, 1, 3, 4, 5, 1, 6, /* "\t\n !\"$&'" */
2809 7, 8, 3, 3, 3, 3, 1, 1, /* "()*-/:;<" */
2810 3, 1, 3, 3, 9, 3, 10, 1, /* "=>?[\\]`|" */
2814 static const uint8_t syntax_index_table[] ALIGN1 = {
2815 0, 1, 0, 2, 3, 4, 0, 5, /* "\t\n !\"$&'" */
2816 6, 7, 2, 2, 2, 2, 0, 0, /* "()*-/:;<" */
2817 2, 0, 2, 2, 8, 2, 9, 0, /* "=>?[\\]`|" */
2826 # if ENABLE_ASH_ALIAS
2832 /* Cast is purely for paranoia here,
2833 * just in case someone passed signed char to us */
2834 if ((unsigned char)c >= CTL_FIRST
2835 && (unsigned char)c <= CTL_LAST
2839 s = strchrnul(spec_symbls, c);
2842 indx = syntax_index_table[s - spec_symbls];
2844 return (S_I_T[indx] >> (syntax*4)) & 0xf;
2847 #else /* !USE_SIT_FUNCTION */
2849 static const uint8_t syntax_index_table[] = {
2850 /* BASESYNTAX_DQSYNTAX_SQSYNTAX_ARISYNTAX */
2851 /* 0 */ CWORD_CWORD_CWORD_CWORD,
2852 /* 1 */ CWORD_CWORD_CWORD_CWORD,
2853 /* 2 */ CWORD_CWORD_CWORD_CWORD,
2854 /* 3 */ CWORD_CWORD_CWORD_CWORD,
2855 /* 4 */ CWORD_CWORD_CWORD_CWORD,
2856 /* 5 */ CWORD_CWORD_CWORD_CWORD,
2857 /* 6 */ CWORD_CWORD_CWORD_CWORD,
2858 /* 7 */ CWORD_CWORD_CWORD_CWORD,
2859 /* 8 */ CWORD_CWORD_CWORD_CWORD,
2860 /* 9 "\t" */ CSPCL_CWORD_CWORD_CWORD,
2861 /* 10 "\n" */ CNL_CNL_CNL_CNL,
2862 /* 11 */ CWORD_CWORD_CWORD_CWORD,
2863 /* 12 */ CWORD_CWORD_CWORD_CWORD,
2864 /* 13 */ CWORD_CWORD_CWORD_CWORD,
2865 /* 14 */ CWORD_CWORD_CWORD_CWORD,
2866 /* 15 */ CWORD_CWORD_CWORD_CWORD,
2867 /* 16 */ CWORD_CWORD_CWORD_CWORD,
2868 /* 17 */ CWORD_CWORD_CWORD_CWORD,
2869 /* 18 */ CWORD_CWORD_CWORD_CWORD,
2870 /* 19 */ CWORD_CWORD_CWORD_CWORD,
2871 /* 20 */ CWORD_CWORD_CWORD_CWORD,
2872 /* 21 */ CWORD_CWORD_CWORD_CWORD,
2873 /* 22 */ CWORD_CWORD_CWORD_CWORD,
2874 /* 23 */ CWORD_CWORD_CWORD_CWORD,
2875 /* 24 */ CWORD_CWORD_CWORD_CWORD,
2876 /* 25 */ CWORD_CWORD_CWORD_CWORD,
2877 /* 26 */ CWORD_CWORD_CWORD_CWORD,
2878 /* 27 */ CWORD_CWORD_CWORD_CWORD,
2879 /* 28 */ CWORD_CWORD_CWORD_CWORD,
2880 /* 29 */ CWORD_CWORD_CWORD_CWORD,
2881 /* 30 */ CWORD_CWORD_CWORD_CWORD,
2882 /* 31 */ CWORD_CWORD_CWORD_CWORD,
2883 /* 32 " " */ CSPCL_CWORD_CWORD_CWORD,
2884 /* 33 "!" */ CWORD_CCTL_CCTL_CWORD,
2885 /* 34 """ */ CDQUOTE_CENDQUOTE_CWORD_CWORD,
2886 /* 35 "#" */ CWORD_CWORD_CWORD_CWORD,
2887 /* 36 "$" */ CVAR_CVAR_CWORD_CVAR,
2888 /* 37 "%" */ CWORD_CWORD_CWORD_CWORD,
2889 /* 38 "&" */ CSPCL_CWORD_CWORD_CWORD,
2890 /* 39 "'" */ CSQUOTE_CWORD_CENDQUOTE_CWORD,
2891 /* 40 "(" */ CSPCL_CWORD_CWORD_CLP,
2892 /* 41 ")" */ CSPCL_CWORD_CWORD_CRP,
2893 /* 42 "*" */ CWORD_CCTL_CCTL_CWORD,
2894 /* 43 "+" */ CWORD_CWORD_CWORD_CWORD,
2895 /* 44 "," */ CWORD_CWORD_CWORD_CWORD,
2896 /* 45 "-" */ CWORD_CCTL_CCTL_CWORD,
2897 /* 46 "." */ CWORD_CWORD_CWORD_CWORD,
2898 /* 47 "/" */ CWORD_CCTL_CCTL_CWORD,
2899 /* 48 "0" */ CWORD_CWORD_CWORD_CWORD,
2900 /* 49 "1" */ CWORD_CWORD_CWORD_CWORD,
2901 /* 50 "2" */ CWORD_CWORD_CWORD_CWORD,
2902 /* 51 "3" */ CWORD_CWORD_CWORD_CWORD,
2903 /* 52 "4" */ CWORD_CWORD_CWORD_CWORD,
2904 /* 53 "5" */ CWORD_CWORD_CWORD_CWORD,
2905 /* 54 "6" */ CWORD_CWORD_CWORD_CWORD,
2906 /* 55 "7" */ CWORD_CWORD_CWORD_CWORD,
2907 /* 56 "8" */ CWORD_CWORD_CWORD_CWORD,
2908 /* 57 "9" */ CWORD_CWORD_CWORD_CWORD,
2909 /* 58 ":" */ CWORD_CCTL_CCTL_CWORD,
2910 /* 59 ";" */ CSPCL_CWORD_CWORD_CWORD,
2911 /* 60 "<" */ CSPCL_CWORD_CWORD_CWORD,
2912 /* 61 "=" */ CWORD_CCTL_CCTL_CWORD,
2913 /* 62 ">" */ CSPCL_CWORD_CWORD_CWORD,
2914 /* 63 "?" */ CWORD_CCTL_CCTL_CWORD,
2915 /* 64 "@" */ CWORD_CWORD_CWORD_CWORD,
2916 /* 65 "A" */ CWORD_CWORD_CWORD_CWORD,
2917 /* 66 "B" */ CWORD_CWORD_CWORD_CWORD,
2918 /* 67 "C" */ CWORD_CWORD_CWORD_CWORD,
2919 /* 68 "D" */ CWORD_CWORD_CWORD_CWORD,
2920 /* 69 "E" */ CWORD_CWORD_CWORD_CWORD,
2921 /* 70 "F" */ CWORD_CWORD_CWORD_CWORD,
2922 /* 71 "G" */ CWORD_CWORD_CWORD_CWORD,
2923 /* 72 "H" */ CWORD_CWORD_CWORD_CWORD,
2924 /* 73 "I" */ CWORD_CWORD_CWORD_CWORD,
2925 /* 74 "J" */ CWORD_CWORD_CWORD_CWORD,
2926 /* 75 "K" */ CWORD_CWORD_CWORD_CWORD,
2927 /* 76 "L" */ CWORD_CWORD_CWORD_CWORD,
2928 /* 77 "M" */ CWORD_CWORD_CWORD_CWORD,
2929 /* 78 "N" */ CWORD_CWORD_CWORD_CWORD,
2930 /* 79 "O" */ CWORD_CWORD_CWORD_CWORD,
2931 /* 80 "P" */ CWORD_CWORD_CWORD_CWORD,
2932 /* 81 "Q" */ CWORD_CWORD_CWORD_CWORD,
2933 /* 82 "R" */ CWORD_CWORD_CWORD_CWORD,
2934 /* 83 "S" */ CWORD_CWORD_CWORD_CWORD,
2935 /* 84 "T" */ CWORD_CWORD_CWORD_CWORD,
2936 /* 85 "U" */ CWORD_CWORD_CWORD_CWORD,
2937 /* 86 "V" */ CWORD_CWORD_CWORD_CWORD,
2938 /* 87 "W" */ CWORD_CWORD_CWORD_CWORD,
2939 /* 88 "X" */ CWORD_CWORD_CWORD_CWORD,
2940 /* 89 "Y" */ CWORD_CWORD_CWORD_CWORD,
2941 /* 90 "Z" */ CWORD_CWORD_CWORD_CWORD,
2942 /* 91 "[" */ CWORD_CCTL_CCTL_CWORD,
2943 /* 92 "\" */ CBACK_CBACK_CCTL_CBACK,
2944 /* 93 "]" */ CWORD_CCTL_CCTL_CWORD,
2945 /* 94 "^" */ CWORD_CWORD_CWORD_CWORD,
2946 /* 95 "_" */ CWORD_CWORD_CWORD_CWORD,
2947 /* 96 "`" */ CBQUOTE_CBQUOTE_CWORD_CBQUOTE,
2948 /* 97 "a" */ CWORD_CWORD_CWORD_CWORD,
2949 /* 98 "b" */ CWORD_CWORD_CWORD_CWORD,
2950 /* 99 "c" */ CWORD_CWORD_CWORD_CWORD,
2951 /* 100 "d" */ CWORD_CWORD_CWORD_CWORD,
2952 /* 101 "e" */ CWORD_CWORD_CWORD_CWORD,
2953 /* 102 "f" */ CWORD_CWORD_CWORD_CWORD,
2954 /* 103 "g" */ CWORD_CWORD_CWORD_CWORD,
2955 /* 104 "h" */ CWORD_CWORD_CWORD_CWORD,
2956 /* 105 "i" */ CWORD_CWORD_CWORD_CWORD,
2957 /* 106 "j" */ CWORD_CWORD_CWORD_CWORD,
2958 /* 107 "k" */ CWORD_CWORD_CWORD_CWORD,
2959 /* 108 "l" */ CWORD_CWORD_CWORD_CWORD,
2960 /* 109 "m" */ CWORD_CWORD_CWORD_CWORD,
2961 /* 110 "n" */ CWORD_CWORD_CWORD_CWORD,
2962 /* 111 "o" */ CWORD_CWORD_CWORD_CWORD,
2963 /* 112 "p" */ CWORD_CWORD_CWORD_CWORD,
2964 /* 113 "q" */ CWORD_CWORD_CWORD_CWORD,
2965 /* 114 "r" */ CWORD_CWORD_CWORD_CWORD,
2966 /* 115 "s" */ CWORD_CWORD_CWORD_CWORD,
2967 /* 116 "t" */ CWORD_CWORD_CWORD_CWORD,
2968 /* 117 "u" */ CWORD_CWORD_CWORD_CWORD,
2969 /* 118 "v" */ CWORD_CWORD_CWORD_CWORD,
2970 /* 119 "w" */ CWORD_CWORD_CWORD_CWORD,
2971 /* 120 "x" */ CWORD_CWORD_CWORD_CWORD,
2972 /* 121 "y" */ CWORD_CWORD_CWORD_CWORD,
2973 /* 122 "z" */ CWORD_CWORD_CWORD_CWORD,
2974 /* 123 "{" */ CWORD_CWORD_CWORD_CWORD,
2975 /* 124 "|" */ CSPCL_CWORD_CWORD_CWORD,
2976 /* 125 "}" */ CENDVAR_CENDVAR_CWORD_CENDVAR,
2977 /* 126 "~" */ CWORD_CCTL_CCTL_CWORD,
2978 /* 127 del */ CWORD_CWORD_CWORD_CWORD,
2979 /* 128 0x80 */ CWORD_CWORD_CWORD_CWORD,
2980 /* 129 CTLESC */ CCTL_CCTL_CCTL_CCTL,
2981 /* 130 CTLVAR */ CCTL_CCTL_CCTL_CCTL,
2982 /* 131 CTLENDVAR */ CCTL_CCTL_CCTL_CCTL,
2983 /* 132 CTLBACKQ */ CCTL_CCTL_CCTL_CCTL,
2984 /* 133 CTLQUOTE */ CCTL_CCTL_CCTL_CCTL,
2985 /* 134 CTLARI */ CCTL_CCTL_CCTL_CCTL,
2986 /* 135 CTLENDARI */ CCTL_CCTL_CCTL_CCTL,
2987 /* 136 CTLQUOTEMARK */ CCTL_CCTL_CCTL_CCTL,
2988 /* 137 */ CWORD_CWORD_CWORD_CWORD,
2989 /* 138 */ CWORD_CWORD_CWORD_CWORD,
2990 /* 139 */ CWORD_CWORD_CWORD_CWORD,
2991 /* 140 */ CWORD_CWORD_CWORD_CWORD,
2992 /* 141 */ CWORD_CWORD_CWORD_CWORD,
2993 /* 142 */ CWORD_CWORD_CWORD_CWORD,
2994 /* 143 */ CWORD_CWORD_CWORD_CWORD,
2995 /* 144 */ CWORD_CWORD_CWORD_CWORD,
2996 /* 145 */ CWORD_CWORD_CWORD_CWORD,
2997 /* 146 */ CWORD_CWORD_CWORD_CWORD,
2998 /* 147 */ CWORD_CWORD_CWORD_CWORD,
2999 /* 148 */ CWORD_CWORD_CWORD_CWORD,
3000 /* 149 */ CWORD_CWORD_CWORD_CWORD,
3001 /* 150 */ CWORD_CWORD_CWORD_CWORD,
3002 /* 151 */ CWORD_CWORD_CWORD_CWORD,
3003 /* 152 */ CWORD_CWORD_CWORD_CWORD,
3004 /* 153 */ CWORD_CWORD_CWORD_CWORD,
3005 /* 154 */ CWORD_CWORD_CWORD_CWORD,
3006 /* 155 */ CWORD_CWORD_CWORD_CWORD,
3007 /* 156 */ CWORD_CWORD_CWORD_CWORD,
3008 /* 157 */ CWORD_CWORD_CWORD_CWORD,
3009 /* 158 */ CWORD_CWORD_CWORD_CWORD,
3010 /* 159 */ CWORD_CWORD_CWORD_CWORD,
3011 /* 160 */ CWORD_CWORD_CWORD_CWORD,
3012 /* 161 */ CWORD_CWORD_CWORD_CWORD,
3013 /* 162 */ CWORD_CWORD_CWORD_CWORD,
3014 /* 163 */ CWORD_CWORD_CWORD_CWORD,
3015 /* 164 */ CWORD_CWORD_CWORD_CWORD,
3016 /* 165 */ CWORD_CWORD_CWORD_CWORD,
3017 /* 166 */ CWORD_CWORD_CWORD_CWORD,
3018 /* 167 */ CWORD_CWORD_CWORD_CWORD,
3019 /* 168 */ CWORD_CWORD_CWORD_CWORD,
3020 /* 169 */ CWORD_CWORD_CWORD_CWORD,
3021 /* 170 */ CWORD_CWORD_CWORD_CWORD,
3022 /* 171 */ CWORD_CWORD_CWORD_CWORD,
3023 /* 172 */ CWORD_CWORD_CWORD_CWORD,
3024 /* 173 */ CWORD_CWORD_CWORD_CWORD,
3025 /* 174 */ CWORD_CWORD_CWORD_CWORD,
3026 /* 175 */ CWORD_CWORD_CWORD_CWORD,
3027 /* 176 */ CWORD_CWORD_CWORD_CWORD,
3028 /* 177 */ CWORD_CWORD_CWORD_CWORD,
3029 /* 178 */ CWORD_CWORD_CWORD_CWORD,
3030 /* 179 */ CWORD_CWORD_CWORD_CWORD,
3031 /* 180 */ CWORD_CWORD_CWORD_CWORD,
3032 /* 181 */ CWORD_CWORD_CWORD_CWORD,
3033 /* 182 */ CWORD_CWORD_CWORD_CWORD,
3034 /* 183 */ CWORD_CWORD_CWORD_CWORD,
3035 /* 184 */ CWORD_CWORD_CWORD_CWORD,
3036 /* 185 */ CWORD_CWORD_CWORD_CWORD,
3037 /* 186 */ CWORD_CWORD_CWORD_CWORD,
3038 /* 187 */ CWORD_CWORD_CWORD_CWORD,
3039 /* 188 */ CWORD_CWORD_CWORD_CWORD,
3040 /* 189 */ CWORD_CWORD_CWORD_CWORD,
3041 /* 190 */ CWORD_CWORD_CWORD_CWORD,
3042 /* 191 */ CWORD_CWORD_CWORD_CWORD,
3043 /* 192 */ CWORD_CWORD_CWORD_CWORD,
3044 /* 193 */ CWORD_CWORD_CWORD_CWORD,
3045 /* 194 */ CWORD_CWORD_CWORD_CWORD,
3046 /* 195 */ CWORD_CWORD_CWORD_CWORD,
3047 /* 196 */ CWORD_CWORD_CWORD_CWORD,
3048 /* 197 */ CWORD_CWORD_CWORD_CWORD,
3049 /* 198 */ CWORD_CWORD_CWORD_CWORD,
3050 /* 199 */ CWORD_CWORD_CWORD_CWORD,
3051 /* 200 */ CWORD_CWORD_CWORD_CWORD,
3052 /* 201 */ CWORD_CWORD_CWORD_CWORD,
3053 /* 202 */ CWORD_CWORD_CWORD_CWORD,
3054 /* 203 */ CWORD_CWORD_CWORD_CWORD,
3055 /* 204 */ CWORD_CWORD_CWORD_CWORD,
3056 /* 205 */ CWORD_CWORD_CWORD_CWORD,
3057 /* 206 */ CWORD_CWORD_CWORD_CWORD,
3058 /* 207 */ CWORD_CWORD_CWORD_CWORD,
3059 /* 208 */ CWORD_CWORD_CWORD_CWORD,
3060 /* 209 */ CWORD_CWORD_CWORD_CWORD,
3061 /* 210 */ CWORD_CWORD_CWORD_CWORD,
3062 /* 211 */ CWORD_CWORD_CWORD_CWORD,
3063 /* 212 */ CWORD_CWORD_CWORD_CWORD,
3064 /* 213 */ CWORD_CWORD_CWORD_CWORD,
3065 /* 214 */ CWORD_CWORD_CWORD_CWORD,
3066 /* 215 */ CWORD_CWORD_CWORD_CWORD,
3067 /* 216 */ CWORD_CWORD_CWORD_CWORD,
3068 /* 217 */ CWORD_CWORD_CWORD_CWORD,
3069 /* 218 */ CWORD_CWORD_CWORD_CWORD,
3070 /* 219 */ CWORD_CWORD_CWORD_CWORD,
3071 /* 220 */ CWORD_CWORD_CWORD_CWORD,
3072 /* 221 */ CWORD_CWORD_CWORD_CWORD,
3073 /* 222 */ CWORD_CWORD_CWORD_CWORD,
3074 /* 223 */ CWORD_CWORD_CWORD_CWORD,
3075 /* 224 */ CWORD_CWORD_CWORD_CWORD,
3076 /* 225 */ CWORD_CWORD_CWORD_CWORD,
3077 /* 226 */ CWORD_CWORD_CWORD_CWORD,
3078 /* 227 */ CWORD_CWORD_CWORD_CWORD,
3079 /* 228 */ CWORD_CWORD_CWORD_CWORD,
3080 /* 229 */ CWORD_CWORD_CWORD_CWORD,
3081 /* 230 */ CWORD_CWORD_CWORD_CWORD,
3082 /* 231 */ CWORD_CWORD_CWORD_CWORD,
3083 /* 232 */ CWORD_CWORD_CWORD_CWORD,
3084 /* 233 */ CWORD_CWORD_CWORD_CWORD,
3085 /* 234 */ CWORD_CWORD_CWORD_CWORD,
3086 /* 235 */ CWORD_CWORD_CWORD_CWORD,
3087 /* 236 */ CWORD_CWORD_CWORD_CWORD,
3088 /* 237 */ CWORD_CWORD_CWORD_CWORD,
3089 /* 238 */ CWORD_CWORD_CWORD_CWORD,
3090 /* 239 */ CWORD_CWORD_CWORD_CWORD,
3091 /* 230 */ CWORD_CWORD_CWORD_CWORD,
3092 /* 241 */ CWORD_CWORD_CWORD_CWORD,
3093 /* 242 */ CWORD_CWORD_CWORD_CWORD,
3094 /* 243 */ CWORD_CWORD_CWORD_CWORD,
3095 /* 244 */ CWORD_CWORD_CWORD_CWORD,
3096 /* 245 */ CWORD_CWORD_CWORD_CWORD,
3097 /* 246 */ CWORD_CWORD_CWORD_CWORD,
3098 /* 247 */ CWORD_CWORD_CWORD_CWORD,
3099 /* 248 */ CWORD_CWORD_CWORD_CWORD,
3100 /* 249 */ CWORD_CWORD_CWORD_CWORD,
3101 /* 250 */ CWORD_CWORD_CWORD_CWORD,
3102 /* 251 */ CWORD_CWORD_CWORD_CWORD,
3103 /* 252 */ CWORD_CWORD_CWORD_CWORD,
3104 /* 253 */ CWORD_CWORD_CWORD_CWORD,
3105 /* 254 */ CWORD_CWORD_CWORD_CWORD,
3106 /* 255 */ CWORD_CWORD_CWORD_CWORD,
3107 /* PEOF */ CENDFILE_CENDFILE_CENDFILE_CENDFILE,
3108 # if ENABLE_ASH_ALIAS
3109 /* PEOA */ CSPCL_CIGN_CIGN_CIGN,
3113 # define SIT(c, syntax) ((S_I_T[syntax_index_table[c]] >> ((syntax)*4)) & 0xf)
3115 #endif /* !USE_SIT_FUNCTION */
3118 /* ============ Alias handling */
3120 #if ENABLE_ASH_ALIAS
3122 #define ALIASINUSE 1
3133 static struct alias **atab; // [ATABSIZE];
3134 #define INIT_G_alias() do { \
3135 atab = xzalloc(ATABSIZE * sizeof(atab[0])); \
3139 static struct alias **
3140 __lookupalias(const char *name) {
3141 unsigned int hashval;
3148 ch = (unsigned char)*p;
3152 ch = (unsigned char)*++p;
3154 app = &atab[hashval % ATABSIZE];
3156 for (; *app; app = &(*app)->next) {
3157 if (strcmp(name, (*app)->name) == 0) {
3165 static struct alias *
3166 lookupalias(const char *name, int check)
3168 struct alias *ap = *__lookupalias(name);
3170 if (check && ap && (ap->flag & ALIASINUSE))
3175 static struct alias *
3176 freealias(struct alias *ap)
3180 if (ap->flag & ALIASINUSE) {
3181 ap->flag |= ALIASDEAD;
3193 setalias(const char *name, const char *val)
3195 struct alias *ap, **app;
3197 app = __lookupalias(name);
3201 if (!(ap->flag & ALIASINUSE)) {
3204 ap->val = ckstrdup(val);
3205 ap->flag &= ~ALIASDEAD;
3208 ap = ckzalloc(sizeof(struct alias));
3209 ap->name = ckstrdup(name);
3210 ap->val = ckstrdup(val);
3211 /*ap->flag = 0; - ckzalloc did it */
3212 /*ap->next = NULL;*/
3219 unalias(const char *name)
3223 app = __lookupalias(name);
3227 *app = freealias(*app);
3238 struct alias *ap, **app;
3242 for (i = 0; i < ATABSIZE; i++) {
3244 for (ap = *app; ap; ap = *app) {
3245 *app = freealias(*app);
3255 printalias(const struct alias *ap)
3257 out1fmt("%s=%s\n", ap->name, single_quote(ap->val));
3261 * TODO - sort output
3263 static int FAST_FUNC
3264 aliascmd(int argc UNUSED_PARAM, char **argv)
3273 for (i = 0; i < ATABSIZE; i++) {
3274 for (ap = atab[i]; ap; ap = ap->next) {
3280 while ((n = *++argv) != NULL) {
3281 v = strchr(n+1, '=');
3282 if (v == NULL) { /* n+1: funny ksh stuff */
3283 ap = *__lookupalias(n);
3285 fprintf(stderr, "%s: %s not found\n", "alias", n);
3298 static int FAST_FUNC
3299 unaliascmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
3303 while ((i = nextopt("a")) != '\0') {
3309 for (i = 0; *argptr; argptr++) {
3310 if (unalias(*argptr)) {
3311 fprintf(stderr, "%s: %s not found\n", "unalias", *argptr);
3319 #endif /* ASH_ALIAS */
3322 /* ============ jobs.c */
3324 /* Mode argument to forkshell. Don't change FORK_FG or FORK_BG. */
3327 #define FORK_NOJOB 2
3329 /* mode flags for showjob(s) */
3330 #define SHOW_ONLY_PGID 0x01 /* show only pgid (jobs -p) */
3331 #define SHOW_PIDS 0x02 /* show individual pids, not just one line per job */
3332 #define SHOW_CHANGED 0x04 /* only jobs whose state has changed */
3335 * A job structure contains information about a job. A job is either a
3336 * single process or a set of processes contained in a pipeline. In the
3337 * latter case, pidlist will be non-NULL, and will point to a -1 terminated
3341 pid_t ps_pid; /* process id */
3342 int ps_status; /* last process status from wait() */
3343 char *ps_cmd; /* text of command being run */
3347 struct procstat ps0; /* status of process */
3348 struct procstat *ps; /* status or processes when more than one */
3350 int stopstatus; /* status of a stopped job */
3353 nprocs: 16, /* number of processes */
3355 #define JOBRUNNING 0 /* at least one proc running */
3356 #define JOBSTOPPED 1 /* all procs are stopped */
3357 #define JOBDONE 2 /* all procs are completed */
3359 sigint: 1, /* job was killed by SIGINT */
3360 jobctl: 1, /* job running under job control */
3362 waited: 1, /* true if this entry has been waited for */
3363 used: 1, /* true if this entry is in used */
3364 changed: 1; /* true if status has changed */
3365 struct job *prev_job; /* previous job */
3368 static struct job *makejob(/*union node *,*/ int);
3369 static int forkshell(struct job *, union node *, int);
3370 static int waitforjob(struct job *);
3373 enum { doing_jobctl = 0 };
3374 #define setjobctl(on) do {} while (0)
3376 static smallint doing_jobctl; //references:8
3377 static void setjobctl(int);
3384 ignoresig(int signo)
3386 /* Avoid unnecessary system calls. Is it already SIG_IGNed? */
3387 if (sigmode[signo - 1] != S_IGN && sigmode[signo - 1] != S_HARD_IGN) {
3388 /* No, need to do it */
3389 signal(signo, SIG_IGN);
3391 sigmode[signo - 1] = S_HARD_IGN;
3395 * Only one usage site - in setsignal()
3398 signal_handler(int signo)
3400 gotsig[signo - 1] = 1;
3402 if (signo == SIGINT && !trap[SIGINT]) {
3403 if (!suppress_int) {
3405 raise_interrupt(); /* does not return */
3409 pending_sig = signo;
3414 * Set the signal handler for the specified signal. The routine figures
3415 * out what it should be set to.
3418 setsignal(int signo)
3421 char cur_act, new_act;
3422 struct sigaction act;
3426 if (t != NULL) { /* trap for this sig is set */
3428 if (t[0] == '\0') /* trap is "": ignore this sig */
3432 if (rootshell && new_act == S_DFL) {
3435 if (iflag || minusc || sflag == 0)
3444 * "In all cases, bash ignores SIGQUIT. Non-builtin
3445 * commands run by bash have signal handlers
3446 * set to the values inherited by the shell
3447 * from its parent". */
3463 //TODO: if !rootshell, we reset SIGQUIT to DFL,
3464 //whereas we have to restore it to what shell got on entry
3465 //from the parent. See comment above
3467 t = &sigmode[signo - 1];
3470 /* current setting is not yet known */
3471 if (sigaction(signo, NULL, &act)) {
3472 /* pretend it worked; maybe we should give a warning,
3473 * but other shells don't. We don't alter sigmode,
3474 * so we retry every time.
3475 * btw, in Linux it never fails. --vda */
3478 if (act.sa_handler == SIG_IGN) {
3479 cur_act = S_HARD_IGN;
3481 && (signo == SIGTSTP || signo == SIGTTIN || signo == SIGTTOU)
3483 cur_act = S_IGN; /* don't hard ignore these */
3487 if (cur_act == S_HARD_IGN || cur_act == new_act)
3490 act.sa_handler = SIG_DFL;
3493 act.sa_handler = signal_handler;
3494 act.sa_flags = 0; /* matters only if !DFL and !IGN */
3495 sigfillset(&act.sa_mask); /* ditto */
3498 act.sa_handler = SIG_IGN;
3501 sigaction_set(signo, &act);
3506 /* mode flags for set_curjob */
3507 #define CUR_DELETE 2
3508 #define CUR_RUNNING 1
3509 #define CUR_STOPPED 0
3511 /* mode flags for dowait */
3512 #define DOWAIT_NONBLOCK WNOHANG
3513 #define DOWAIT_BLOCK 0
3516 /* pgrp of shell on invocation */
3517 static int initialpgrp; //references:2
3518 static int ttyfd = -1; //5
3521 static struct job *jobtab; //5
3523 static unsigned njobs; //4
3525 static struct job *curjob; //lots
3526 /* number of presumed living untracked jobs */
3527 static int jobless; //4
3530 set_curjob(struct job *jp, unsigned mode)
3533 struct job **jpp, **curp;
3535 /* first remove from list */
3536 jpp = curp = &curjob;
3541 jpp = &jp1->prev_job;
3543 *jpp = jp1->prev_job;
3545 /* Then re-insert in correct position */
3553 /* job being deleted */
3556 /* newly created job or backgrounded job,
3557 put after all stopped jobs. */
3561 if (!jp1 || jp1->state != JOBSTOPPED)
3564 jpp = &jp1->prev_job;
3570 /* newly stopped job - becomes curjob */
3571 jp->prev_job = *jpp;
3579 jobno(const struct job *jp)
3581 return jp - jobtab + 1;
3586 * Convert a job name to a job structure.
3589 #define getjob(name, getctl) getjob(name)
3592 getjob(const char *name, int getctl)
3596 const char *err_msg = "%s: no such job";
3600 char *(*match)(const char *, const char *);
3615 if (c == '+' || c == '%') {
3617 err_msg = "No current job";
3623 err_msg = "No previous job";
3634 jp = jobtab + num - 1;
3649 if (match(jp->ps[0].ps_cmd, p)) {
3653 err_msg = "%s: ambiguous";
3663 err_msg = "job %s not created under job control";
3664 if (getctl && jp->jobctl == 0)
3669 ash_msg_and_raise_error(err_msg, name);
3673 * Mark a job structure as unused.
3676 freejob(struct job *jp)
3678 struct procstat *ps;
3682 for (i = jp->nprocs, ps = jp->ps; --i >= 0; ps++) {
3683 if (ps->ps_cmd != nullstr)
3686 if (jp->ps != &jp->ps0)
3689 set_curjob(jp, CUR_DELETE);
3695 xtcsetpgrp(int fd, pid_t pgrp)
3697 if (tcsetpgrp(fd, pgrp))
3698 ash_msg_and_raise_error("can't set tty process group (%m)");
3702 * Turn job control on and off.
3704 * Note: This code assumes that the third arg to ioctl is a character
3705 * pointer, which is true on Berkeley systems but not System V. Since
3706 * System V doesn't have job control yet, this isn't a problem now.
3708 * Called with interrupts off.
3716 if (on == doing_jobctl || rootshell == 0)
3720 ofd = fd = open(_PATH_TTY, O_RDWR);
3722 /* BTW, bash will try to open(ttyname(0)) if open("/dev/tty") fails.
3723 * That sometimes helps to acquire controlling tty.
3724 * Obviously, a workaround for bugs when someone
3725 * failed to provide a controlling tty to bash! :) */
3731 fd = fcntl(fd, F_DUPFD, 10);
3736 /* fd is a tty at this point */
3737 close_on_exec_on(fd);
3738 while (1) { /* while we are in the background */
3739 pgrp = tcgetpgrp(fd);
3742 ash_msg("can't access tty; job control turned off");
3746 if (pgrp == getpgrp())
3757 xtcsetpgrp(fd, pgrp);
3759 /* turning job control off */
3762 /* was xtcsetpgrp, but this can make exiting ash
3763 * loop forever if pty is already deleted */
3764 tcsetpgrp(fd, pgrp);
3778 static int FAST_FUNC
3779 killcmd(int argc, char **argv)
3781 if (argv[1] && strcmp(argv[1], "-l") != 0) {
3784 if (argv[i][0] == '%') {
3786 * "kill %N" - job kill
3787 * Converting to pgrp / pid kill
3793 jp = getjob(argv[i], 0);
3795 * In jobs started under job control, we signal
3796 * entire process group by kill -PGRP_ID.
3797 * This happens, f.e., in interactive shell.
3799 * Otherwise, we signal each child via
3800 * kill PID1 PID2 PID3.
3802 * sh -c 'sleep 1|sleep 1 & kill %1'
3803 * sh -c 'true|sleep 2 & sleep 1; kill %1'
3804 * sh -c 'true|sleep 1 & sleep 2; kill %1'
3806 n = jp->nprocs; /* can't be 0 (I hope) */
3809 dst = alloca(n * sizeof(int)*4);
3811 for (j = 0; j < n; j++) {
3812 struct procstat *ps = &jp->ps[j];
3813 /* Skip non-running and not-stopped members
3814 * (i.e. dead members) of the job
3816 if (ps->ps_status != -1 && !WIFSTOPPED(ps->ps_status))
3819 * kill_main has matching code to expect
3820 * leading space. Needed to not confuse
3821 * negative pids with "kill -SIGNAL_NO" syntax
3823 dst += sprintf(dst, jp->jobctl ? " -%u" : " %u", (int)ps->ps_pid);
3827 } while (argv[++i]);
3829 return kill_main(argc, argv);
3833 showpipe(struct job *jp /*, FILE *out*/)
3835 struct procstat *ps;
3836 struct procstat *psend;
3838 psend = jp->ps + jp->nprocs;
3839 for (ps = jp->ps + 1; ps < psend; ps++)
3840 printf(" | %s", ps->ps_cmd);
3841 outcslow('\n', stdout);
3842 flush_stdout_stderr();
3847 restartjob(struct job *jp, int mode)
3849 struct procstat *ps;
3855 if (jp->state == JOBDONE)
3857 jp->state = JOBRUNNING;
3858 pgid = jp->ps[0].ps_pid;
3859 if (mode == FORK_FG)
3860 xtcsetpgrp(ttyfd, pgid);
3861 killpg(pgid, SIGCONT);
3865 if (WIFSTOPPED(ps->ps_status)) {
3871 status = (mode == FORK_FG) ? waitforjob(jp) : 0;
3876 static int FAST_FUNC
3877 fg_bgcmd(int argc UNUSED_PARAM, char **argv)
3883 mode = (**argv == 'f') ? FORK_FG : FORK_BG;
3887 jp = getjob(*argv, 1);
3888 if (mode == FORK_BG) {
3889 set_curjob(jp, CUR_RUNNING);
3890 printf("[%d] ", jobno(jp));
3892 out1str(jp->ps[0].ps_cmd);
3893 showpipe(jp /*, stdout*/);
3894 retval = restartjob(jp, mode);
3895 } while (*argv && *++argv);
3901 sprint_status(char *s, int status, int sigonly)
3907 if (!WIFEXITED(status)) {
3909 if (WIFSTOPPED(status))
3910 st = WSTOPSIG(status);
3913 st = WTERMSIG(status);
3915 if (st == SIGINT || st == SIGPIPE)
3918 if (WIFSTOPPED(status))
3923 //TODO: use bbox's get_signame? strsignal adds ~600 bytes to text+rodata
3924 col = fmtstr(s, 32, strsignal(st));
3925 if (WCOREDUMP(status)) {
3926 col += fmtstr(s + col, 16, " (core dumped)");
3928 } else if (!sigonly) {
3929 st = WEXITSTATUS(status);
3931 col = fmtstr(s, 16, "Done(%d)", st);
3933 col = fmtstr(s, 16, "Done");
3940 dowait(int wait_flags, struct job *job)
3945 struct job *thisjob;
3948 TRACE(("dowait(0x%x) called\n", wait_flags));
3950 /* Do a wait system call. If job control is compiled in, we accept
3951 * stopped processes. wait_flags may have WNOHANG, preventing blocking.
3952 * NB: _not_ safe_waitpid, we need to detect EINTR */
3954 wait_flags |= WUNTRACED;
3955 pid = waitpid(-1, &status, wait_flags);
3956 TRACE(("wait returns pid=%d, status=0x%x, errno=%d(%s)\n",
3957 pid, status, errno, strerror(errno)));
3963 for (jp = curjob; jp; jp = jp->prev_job) {
3964 struct procstat *ps;
3965 struct procstat *psend;
3966 if (jp->state == JOBDONE)
3970 psend = ps + jp->nprocs;
3972 if (ps->ps_pid == pid) {
3973 TRACE(("Job %d: changing status of proc %d "
3974 "from 0x%x to 0x%x\n",
3975 jobno(jp), pid, ps->ps_status, status));
3976 ps->ps_status = status;
3979 if (ps->ps_status == -1)
3982 if (state == JOBRUNNING)
3984 if (WIFSTOPPED(ps->ps_status)) {
3985 jp->stopstatus = ps->ps_status;
3989 } while (++ps < psend);
3994 if (!WIFSTOPPED(status))
4000 if (state != JOBRUNNING) {
4001 thisjob->changed = 1;
4003 if (thisjob->state != state) {
4004 TRACE(("Job %d: changing state from %d to %d\n",
4005 jobno(thisjob), thisjob->state, state));
4006 thisjob->state = state;
4008 if (state == JOBSTOPPED) {
4009 set_curjob(thisjob, CUR_STOPPED);
4018 if (thisjob && thisjob == job) {
4022 len = sprint_status(s, status, 1);
4033 blocking_wait_with_raise_on_sig(void)
4035 pid_t pid = dowait(DOWAIT_BLOCK, NULL);
4036 if (pid <= 0 && pending_sig)
4037 raise_exception(EXSIG);
4043 showjob(FILE *out, struct job *jp, int mode)
4045 struct procstat *ps;
4046 struct procstat *psend;
4053 if (mode & SHOW_ONLY_PGID) { /* jobs -p */
4054 /* just output process (group) id of pipeline */
4055 fprintf(out, "%d\n", ps->ps_pid);
4059 col = fmtstr(s, 16, "[%d] ", jobno(jp));
4064 else if (curjob && jp == curjob->prev_job)
4067 if (mode & SHOW_PIDS)
4068 col += fmtstr(s + col, 16, "%d ", ps->ps_pid);
4070 psend = ps + jp->nprocs;
4072 if (jp->state == JOBRUNNING) {
4073 strcpy(s + col, "Running");
4074 col += sizeof("Running") - 1;
4076 int status = psend[-1].ps_status;
4077 if (jp->state == JOBSTOPPED)
4078 status = jp->stopstatus;
4079 col += sprint_status(s + col, status, 0);
4081 /* By now, "[JOBID]* [maybe PID] STATUS" is printed */
4083 /* This loop either prints "<cmd1> | <cmd2> | <cmd3>" line
4084 * or prints several "PID | <cmdN>" lines,
4085 * depending on SHOW_PIDS bit.
4086 * We do not print status of individual processes
4087 * between PID and <cmdN>. bash does it, but not very well:
4088 * first line shows overall job status, not process status,
4089 * making it impossible to know 1st process status.
4093 /* for each process */
4096 if (mode & SHOW_PIDS)
4097 col = fmtstr(s, 48, "\n%*c%d ", indent_col, ' ', ps->ps_pid) - 1;
4099 fprintf(out, "%s%*c%s%s",
4101 33 - col >= 0 ? 33 - col : 0, ' ',
4102 ps == jp->ps ? "" : "| ",
4105 } while (++ps != psend);
4106 outcslow('\n', out);
4110 if (jp->state == JOBDONE) {
4111 TRACE(("showjob: freeing job %d\n", jobno(jp)));
4117 * Print a list of jobs. If "change" is nonzero, only print jobs whose
4118 * statuses have changed since the last call to showjobs.
4121 showjobs(FILE *out, int mode)
4125 TRACE(("showjobs(0x%x) called\n", mode));
4127 /* Handle all finished jobs */
4128 while (dowait(DOWAIT_NONBLOCK, NULL) > 0)
4131 for (jp = curjob; jp; jp = jp->prev_job) {
4132 if (!(mode & SHOW_CHANGED) || jp->changed) {
4133 showjob(out, jp, mode);
4138 static int FAST_FUNC
4139 jobscmd(int argc UNUSED_PARAM, char **argv)
4144 while ((m = nextopt("lp")) != '\0') {
4148 mode |= SHOW_ONLY_PGID;
4154 showjob(stdout, getjob(*argv, 0), mode);
4157 showjobs(stdout, mode);
4164 /* Called only on finished or stopped jobs (no members are running) */
4166 getstatus(struct job *job)
4170 struct procstat *ps;
4172 /* Fetch last member's status */
4173 ps = job->ps + job->nprocs - 1;
4174 status = ps->ps_status;
4176 /* "set -o pipefail" mode: use last _nonzero_ status */
4177 while (status == 0 && --ps >= job->ps)
4178 status = ps->ps_status;
4181 retval = WEXITSTATUS(status);
4182 if (!WIFEXITED(status)) {
4184 retval = WSTOPSIG(status);
4185 if (!WIFSTOPPED(status))
4188 /* XXX: limits number of signals */
4189 retval = WTERMSIG(status);
4191 if (retval == SIGINT)
4197 TRACE(("getstatus: job %d, nproc %d, status 0x%x, retval 0x%x\n",
4198 jobno(job), job->nprocs, status, retval));
4202 static int FAST_FUNC
4203 waitcmd(int argc UNUSED_PARAM, char **argv)
4210 raise_exception(EXSIG);
4217 /* wait for all jobs */
4221 if (!jp) /* no running procs */
4223 if (jp->state == JOBRUNNING)
4228 blocking_wait_with_raise_on_sig();
4230 * "When bash is waiting for an asynchronous command via
4231 * the wait builtin, the reception of a signal for which a trap
4232 * has been set will cause the wait builtin to return immediately
4233 * with an exit status greater than 128, immediately after which
4234 * the trap is executed."
4236 * blocking_wait_with_raise_on_sig raises signal handlers
4237 * if it gets no pid (pid < 0). However,
4238 * if child sends us a signal *and immediately exits*,
4239 * blocking_wait_with_raise_on_sig gets pid > 0
4240 * and does not handle pending_sig. Check this case: */
4242 raise_exception(EXSIG);
4248 if (**argv != '%') {
4249 pid_t pid = number(*argv);
4254 if (job->ps[job->nprocs - 1].ps_pid == pid)
4256 job = job->prev_job;
4259 job = getjob(*argv, 0);
4261 /* loop until process terminated or stopped */
4262 while (job->state == JOBRUNNING)
4263 blocking_wait_with_raise_on_sig();
4265 retval = getstatus(job);
4278 struct job *jp, *jq;
4280 len = njobs * sizeof(*jp);
4282 jp = ckrealloc(jq, len + 4 * sizeof(*jp));
4284 offset = (char *)jp - (char *)jq;
4286 /* Relocate pointers */
4289 jq = (struct job *)((char *)jq + l);
4293 #define joff(p) ((struct job *)((char *)(p) + l))
4294 #define jmove(p) (p) = (void *)((char *)(p) + offset)
4295 if (joff(jp)->ps == &jq->ps0)
4296 jmove(joff(jp)->ps);
4297 if (joff(jp)->prev_job)
4298 jmove(joff(jp)->prev_job);
4308 jp = (struct job *)((char *)jp + len);
4312 } while (--jq >= jp);
4317 * Return a new job structure.
4318 * Called with interrupts off.
4321 makejob(/*union node *node,*/ int nprocs)
4326 for (i = njobs, jp = jobtab; ; jp++) {
4333 if (jp->state != JOBDONE || !jp->waited)
4342 memset(jp, 0, sizeof(*jp));
4344 /* jp->jobctl is a bitfield.
4345 * "jp->jobctl |= jobctl" likely to give awful code */
4349 jp->prev_job = curjob;
4354 jp->ps = ckmalloc(nprocs * sizeof(struct procstat));
4356 TRACE(("makejob(%d) returns %%%d\n", nprocs,
4363 * Return a string identifying a command (to be printed by the
4366 static char *cmdnextc;
4369 cmdputs(const char *s)
4371 static const char vstype[VSTYPE + 1][3] = {
4372 "", "}", "-", "+", "?", "=",
4373 "%", "%%", "#", "##"
4374 IF_ASH_BASH_COMPAT(, ":", "/", "//")
4377 const char *p, *str;
4381 unsigned char subtype = 0;
4385 nextc = makestrspace((strlen(s) + 1) * 8, cmdnextc);
4387 while ((c = *p++) != '\0') {
4395 if ((subtype & VSTYPE) == VSLENGTH)
4399 if (!(subtype & VSQUOTE) == !(quoted & 1))
4405 str = "\"}" + !(quoted & 1);
4412 case CTLBACKQ+CTLQUOTE:
4415 #if ENABLE_SH_MATH_SUPPORT
4430 if ((subtype & VSTYPE) != VSNORMAL)
4432 str = vstype[subtype & VSTYPE];
4433 if (subtype & VSNUL)
4442 /* These can only happen inside quotes */
4455 while ((c = *str++) != '\0') {
4458 } /* while *p++ not NUL */
4461 USTPUTC('"', nextc);
4467 /* cmdtxt() and cmdlist() call each other */
4468 static void cmdtxt(union node *n);
4471 cmdlist(union node *np, int sep)
4473 for (; np; np = np->narg.next) {
4477 if (sep && np->narg.next)
4483 cmdtxt(union node *n)
4486 struct nodelist *lp;
4497 lp = n->npipe.cmdlist;
4515 cmdtxt(n->nbinary.ch1);
4531 cmdtxt(n->nif.test);
4533 if (n->nif.elsepart) {
4534 cmdtxt(n->nif.ifpart);
4536 n = n->nif.elsepart;
4554 cmdtxt(n->nbinary.ch1);
4564 cmdputs(n->nfor.var);
4566 cmdlist(n->nfor.args, 1);
4571 cmdputs(n->narg.text);
4575 cmdlist(n->ncmd.args, 1);
4576 cmdlist(n->ncmd.redirect, 0);
4589 cmdputs(n->ncase.expr->narg.text);
4591 for (np = n->ncase.cases; np; np = np->nclist.next) {
4592 cmdtxt(np->nclist.pattern);
4594 cmdtxt(np->nclist.body);
4608 #if ENABLE_ASH_BASH_COMPAT
4623 cmdputs(utoa(n->nfile.fd));
4625 if (n->type == NTOFD || n->type == NFROMFD) {
4626 cmdputs(utoa(n->ndup.dupfd));
4635 commandtext(union node *n)
4639 STARTSTACKSTR(cmdnextc);
4641 name = stackblock();
4642 TRACE(("commandtext: name %p, end %p\n\t\"%s\"\n",
4643 name, cmdnextc, cmdnextc));
4644 return ckstrdup(name);
4649 * Fork off a subshell. If we are doing job control, give the subshell its
4650 * own process group. Jp is a job structure that the job is to be added to.
4651 * N is the command that will be evaluated by the child. Both jp and n may
4652 * be NULL. The mode parameter can be one of the following:
4653 * FORK_FG - Fork off a foreground process.
4654 * FORK_BG - Fork off a background process.
4655 * FORK_NOJOB - Like FORK_FG, but don't give the process its own
4656 * process group even if job control is on.
4658 * When job control is turned off, background processes have their standard
4659 * input redirected to /dev/null (except for the second and later processes
4662 * Called with interrupts off.
4665 * Clear traps on a fork.
4672 for (tp = trap; tp < &trap[NSIG]; tp++) {
4673 if (*tp && **tp) { /* trap not NULL or "" (SIG_IGN) */
4675 if (trap_ptr == trap)
4677 /* else: it "belongs" to trap_ptr vector, don't free */
4679 if ((tp - trap) != 0)
4680 setsignal(tp - trap);
4687 /* Lives far away from here, needed for forkchild */
4688 static void closescript(void);
4690 /* Called after fork(), in child */
4691 static NOINLINE void
4692 forkchild(struct job *jp, union node *n, int mode)
4696 TRACE(("Child shell %d\n", getpid()));
4700 /* man bash: "Non-builtin commands run by bash have signal handlers
4701 * set to the values inherited by the shell from its parent".
4702 * Do we do it correctly? */
4706 if (mode == FORK_NOJOB /* is it `xxx` ? */
4707 && n && n->type == NCMD /* is it single cmd? */
4708 /* && n->ncmd.args->type == NARG - always true? */
4709 && n->ncmd.args && strcmp(n->ncmd.args->narg.text, "trap") == 0
4710 && n->ncmd.args->narg.next == NULL /* "trap" with no arguments */
4711 /* && n->ncmd.args->narg.backquote == NULL - do we need to check this? */
4713 TRACE(("Trap hack\n"));
4714 /* Awful hack for `trap` or $(trap).
4716 * http://www.opengroup.org/onlinepubs/009695399/utilities/trap.html
4717 * contains an example where "trap" is executed in a subshell:
4719 * save_traps=$(trap)
4721 * eval "$save_traps"
4723 * Standard does not say that "trap" in subshell shall print
4724 * parent shell's traps. It only says that its output
4725 * must have suitable form, but then, in the above example
4726 * (which is not supposed to be normative), it implies that.
4728 * bash (and probably other shell) does implement it
4729 * (traps are reset to defaults, but "trap" still shows them),
4730 * but as a result, "trap" logic is hopelessly messed up:
4733 * trap -- 'echo Ho' SIGWINCH <--- we have a handler
4734 * # (trap) <--- trap is in subshell - no output (correct, traps are reset)
4735 * # true | trap <--- trap is in subshell - no output (ditto)
4736 * # echo `true | trap` <--- in subshell - output (but traps are reset!)
4737 * trap -- 'echo Ho' SIGWINCH
4738 * # echo `(trap)` <--- in subshell in subshell - output
4739 * trap -- 'echo Ho' SIGWINCH
4740 * # echo `true | (trap)` <--- in subshell in subshell in subshell - output!
4741 * trap -- 'echo Ho' SIGWINCH
4743 * The rules when to forget and when to not forget traps
4744 * get really complex and nonsensical.
4746 * Our solution: ONLY bare $(trap) or `trap` is special.
4748 /* Save trap handler strings for trap builtin to print */
4749 trap_ptr = memcpy(xmalloc(sizeof(trap)), trap, sizeof(trap));
4750 /* Fall through into clearing traps */
4754 /* do job control only in root shell */
4756 if (mode != FORK_NOJOB && jp->jobctl && oldlvl == 0) {
4759 if (jp->nprocs == 0)
4762 pgrp = jp->ps[0].ps_pid;
4763 /* this can fail because we are doing it in the parent also */
4765 if (mode == FORK_FG)
4766 xtcsetpgrp(ttyfd, pgrp);
4771 if (mode == FORK_BG) {
4772 /* man bash: "When job control is not in effect,
4773 * asynchronous commands ignore SIGINT and SIGQUIT" */
4776 if (jp->nprocs == 0) {
4778 if (open(bb_dev_null, O_RDONLY) != 0)
4779 ash_msg_and_raise_error("can't open '%s'", bb_dev_null);
4783 if (iflag) { /* why if iflag only? */
4788 * "In all cases, bash ignores SIGQUIT. Non-builtin
4789 * commands run by bash have signal handlers
4790 * set to the values inherited by the shell
4792 * Take care of the second rule: */
4796 if (n && n->type == NCMD
4797 && n->ncmd.args && strcmp(n->ncmd.args->narg.text, "jobs") == 0
4799 TRACE(("Job hack\n"));
4800 /* "jobs": we do not want to clear job list for it,
4801 * instead we remove only _its_ own_ job from job list.
4802 * This makes "jobs .... | cat" more useful.
4808 for (jp = curjob; jp; jp = jp->prev_job)
4813 /* Called after fork(), in parent */
4815 #define forkparent(jp, n, mode, pid) forkparent(jp, mode, pid)
4818 forkparent(struct job *jp, union node *n, int mode, pid_t pid)
4820 TRACE(("In parent shell: child = %d\n", pid));
4822 while (jobless && dowait(DOWAIT_NONBLOCK, NULL) > 0)
4828 if (mode != FORK_NOJOB && jp->jobctl) {
4831 if (jp->nprocs == 0)
4834 pgrp = jp->ps[0].ps_pid;
4835 /* This can fail because we are doing it in the child also */
4839 if (mode == FORK_BG) {
4840 backgndpid = pid; /* set $! */
4841 set_curjob(jp, CUR_RUNNING);
4844 struct procstat *ps = &jp->ps[jp->nprocs++];
4847 ps->ps_cmd = nullstr;
4849 if (doing_jobctl && n)
4850 ps->ps_cmd = commandtext(n);
4856 forkshell(struct job *jp, union node *n, int mode)
4860 TRACE(("forkshell(%%%d, %p, %d) called\n", jobno(jp), n, mode));
4863 TRACE(("Fork failed, errno=%d", errno));
4866 ash_msg_and_raise_error("can't fork");
4869 CLEAR_RANDOM_T(&random_gen); /* or else $RANDOM repeats in child */
4870 forkchild(jp, n, mode);
4872 forkparent(jp, n, mode, pid);
4878 * Wait for job to finish.
4880 * Under job control we have the problem that while a child process
4881 * is running interrupts generated by the user are sent to the child
4882 * but not to the shell. This means that an infinite loop started by
4883 * an interactive user may be hard to kill. With job control turned off,
4884 * an interactive user may place an interactive program inside a loop.
4885 * If the interactive program catches interrupts, the user doesn't want
4886 * these interrupts to also abort the loop. The approach we take here
4887 * is to have the shell ignore interrupt signals while waiting for a
4888 * foreground process to terminate, and then send itself an interrupt
4889 * signal if the child process was terminated by an interrupt signal.
4890 * Unfortunately, some programs want to do a bit of cleanup and then
4891 * exit on interrupt; unless these processes terminate themselves by
4892 * sending a signal to themselves (instead of calling exit) they will
4893 * confuse this approach.
4895 * Called with interrupts off.
4898 waitforjob(struct job *jp)
4902 TRACE(("waitforjob(%%%d) called\n", jobno(jp)));
4905 while (jp->state == JOBRUNNING) {
4906 /* In non-interactive shells, we _can_ get
4907 * a keyboard signal here and be EINTRed,
4908 * but we just loop back, waiting for command to complete.
4911 * "If bash is waiting for a command to complete and receives
4912 * a signal for which a trap has been set, the trap
4913 * will not be executed until the command completes."
4915 * Reality is that even if trap is not set, bash
4916 * will not act on the signal until command completes.
4917 * Try this. sleep5intoff.c:
4918 * #include <signal.h>
4919 * #include <unistd.h>
4922 * sigemptyset(&set);
4923 * sigaddset(&set, SIGINT);
4924 * sigaddset(&set, SIGQUIT);
4925 * sigprocmask(SIG_BLOCK, &set, NULL);
4929 * $ bash -c './sleep5intoff; echo hi'
4930 * ^C^C^C^C <--- pressing ^C once a second
4932 * $ bash -c './sleep5intoff; echo hi'
4933 * ^\^\^\^\hi <--- pressing ^\ (SIGQUIT)
4936 dowait(DOWAIT_BLOCK, jp);
4943 xtcsetpgrp(ttyfd, rootpid);
4945 * This is truly gross.
4946 * If we're doing job control, then we did a TIOCSPGRP which
4947 * caused us (the shell) to no longer be in the controlling
4948 * session -- so we wouldn't have seen any ^C/SIGINT. So, we
4949 * intuit from the subprocess exit status whether a SIGINT
4950 * occurred, and if so interrupt ourselves. Yuck. - mycroft
4952 if (jp->sigint) /* TODO: do the same with all signals */
4953 raise(SIGINT); /* ... by raise(jp->sig) instead? */
4955 if (jp->state == JOBDONE)
4962 * return 1 if there are stopped jobs, otherwise 0
4974 if (jp && jp->state == JOBSTOPPED) {
4975 out2str("You have stopped jobs.\n");
4984 /* ============ redir.c
4986 * Code for dealing with input/output redirection.
4991 #define EMPTY -2 /* marks an unused slot in redirtab */
4992 #define CLOSED -3 /* marks a slot of previously-closed fd */
4995 * Open a file in noclobber mode.
4996 * The code was copied from bash.
4999 noclobberopen(const char *fname)
5002 struct stat finfo, finfo2;
5005 * If the file exists and is a regular file, return an error
5008 r = stat(fname, &finfo);
5009 if (r == 0 && S_ISREG(finfo.st_mode)) {
5015 * If the file was not present (r != 0), make sure we open it
5016 * exclusively so that if it is created before we open it, our open
5017 * will fail. Make sure that we do not truncate an existing file.
5018 * Note that we don't turn on O_EXCL unless the stat failed -- if the
5019 * file was not a regular file, we leave O_EXCL off.
5022 return open(fname, O_WRONLY|O_CREAT|O_EXCL, 0666);
5023 fd = open(fname, O_WRONLY|O_CREAT, 0666);
5025 /* If the open failed, return the file descriptor right away. */
5030 * OK, the open succeeded, but the file may have been changed from a
5031 * non-regular file to a regular file between the stat and the open.
5032 * We are assuming that the O_EXCL open handles the case where FILENAME
5033 * did not exist and is symlinked to an existing file between the stat
5038 * If we can open it and fstat the file descriptor, and neither check
5039 * revealed that it was a regular file, and the file has not been
5040 * replaced, return the file descriptor.
5042 if (fstat(fd, &finfo2) == 0
5043 && !S_ISREG(finfo2.st_mode)
5044 && finfo.st_dev == finfo2.st_dev
5045 && finfo.st_ino == finfo2.st_ino
5050 /* The file has been replaced. badness. */
5057 * Handle here documents. Normally we fork off a process to write the
5058 * data to a pipe. If the document is short, we can stuff the data in
5059 * the pipe without forking.
5061 /* openhere needs this forward reference */
5062 static void expandhere(union node *arg, int fd);
5064 openhere(union node *redir)
5070 ash_msg_and_raise_error("pipe call failed");
5071 if (redir->type == NHERE) {
5072 len = strlen(redir->nhere.doc->narg.text);
5073 if (len <= PIPE_BUF) {
5074 full_write(pip[1], redir->nhere.doc->narg.text, len);
5078 if (forkshell((struct job *)NULL, (union node *)NULL, FORK_NOJOB) == 0) {
5081 ignoresig(SIGINT); //signal(SIGINT, SIG_IGN);
5082 ignoresig(SIGQUIT); //signal(SIGQUIT, SIG_IGN);
5083 ignoresig(SIGHUP); //signal(SIGHUP, SIG_IGN);
5084 ignoresig(SIGTSTP); //signal(SIGTSTP, SIG_IGN);
5085 signal(SIGPIPE, SIG_DFL);
5086 if (redir->type == NHERE)
5087 full_write(pip[1], redir->nhere.doc->narg.text, len);
5089 expandhere(redir->nhere.doc, pip[1]);
5090 _exit(EXIT_SUCCESS);
5098 openredirect(union node *redir)
5103 switch (redir->nfile.type) {
5105 fname = redir->nfile.expfname;
5106 f = open(fname, O_RDONLY);
5111 fname = redir->nfile.expfname;
5112 f = open(fname, O_RDWR|O_CREAT, 0666);
5117 #if ENABLE_ASH_BASH_COMPAT
5120 /* Take care of noclobber mode. */
5122 fname = redir->nfile.expfname;
5123 f = noclobberopen(fname);
5130 fname = redir->nfile.expfname;
5131 f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666);
5136 fname = redir->nfile.expfname;
5137 f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666);
5145 /* Fall through to eliminate warning. */
5146 /* Our single caller does this itself */
5153 f = openhere(redir);
5159 ash_msg_and_raise_error("can't create %s: %s", fname, errmsg(errno, "nonexistent directory"));
5161 ash_msg_and_raise_error("can't open %s: %s", fname, errmsg(errno, "no such file"));
5165 * Copy a file descriptor to be >= to. Returns -1
5166 * if the source file descriptor is closed, EMPTY if there are no unused
5167 * file descriptors left.
5169 /* 0x800..00: bit to set in "to" to request dup2 instead of fcntl(F_DUPFD).
5170 * old code was doing close(to) prior to copyfd() to achieve the same */
5172 COPYFD_EXACT = (int)~(INT_MAX),
5173 COPYFD_RESTORE = (int)((unsigned)COPYFD_EXACT >> 1),
5176 copyfd(int from, int to)
5180 if (to & COPYFD_EXACT) {
5181 to &= ~COPYFD_EXACT;
5183 newfd = dup2(from, to);
5185 newfd = fcntl(from, F_DUPFD, to);
5188 if (errno == EMFILE)
5190 /* Happens when source fd is not open: try "echo >&99" */
5191 ash_msg_and_raise_error("%d: %m", from);
5196 /* Struct def and variable are moved down to the first usage site */
5201 struct redirtab *next;
5204 struct two_fd_t two_fd[];
5206 #define redirlist (G_var.redirlist)
5208 static int need_to_remember(struct redirtab *rp, int fd)
5212 if (!rp) /* remembering was not requested */
5215 for (i = 0; i < rp->pair_count; i++) {
5216 if (rp->two_fd[i].orig == fd) {
5217 /* already remembered */
5224 /* "hidden" fd is a fd used to read scripts, or a copy of such */
5225 static int is_hidden_fd(struct redirtab *rp, int fd)
5228 struct parsefile *pf;
5232 /* Check open scripts' fds */
5235 /* We skip pf_fd == 0 case because of the following case:
5236 * $ ash # running ash interactively
5238 * and in script.sh: "exec 9>&0".
5239 * Even though top-level pf_fd _is_ 0,
5240 * it's still ok to use it: "read" builtin uses it,
5241 * why should we cripple "exec" builtin?
5243 if (pf->pf_fd > 0 && fd == pf->pf_fd) {
5251 /* Check saved fds of redirects */
5252 fd |= COPYFD_RESTORE;
5253 for (i = 0; i < rp->pair_count; i++) {
5254 if (rp->two_fd[i].copy == fd) {
5262 * Process a list of redirection commands. If the REDIR_PUSH flag is set,
5263 * old file descriptors are stashed away so that the redirection can be
5264 * undone by calling popredir.
5266 /* flags passed to redirect */
5267 #define REDIR_PUSH 01 /* save previous values of file descriptors */
5268 #define REDIR_SAVEFD2 03 /* set preverrout */
5270 redirect(union node *redir, int flags)
5272 struct redirtab *sv;
5277 int copied_fd2 = -1;
5287 if (flags & REDIR_PUSH) {
5288 union node *tmp = redir;
5291 #if ENABLE_ASH_BASH_COMPAT
5292 if (tmp->nfile.type == NTO2)
5295 tmp = tmp->nfile.next;
5297 sv = ckmalloc(sizeof(*sv) + sv_pos * sizeof(sv->two_fd[0]));
5298 sv->next = redirlist;
5299 sv->pair_count = sv_pos;
5301 sv->nullredirs = g_nullredirs - 1;
5303 while (sv_pos > 0) {
5305 sv->two_fd[sv_pos].orig = sv->two_fd[sv_pos].copy = EMPTY;
5311 fd = redir->nfile.fd;
5312 if (redir->nfile.type == NTOFD || redir->nfile.type == NFROMFD) {
5313 right_fd = redir->ndup.dupfd;
5314 //bb_error_msg("doing %d > %d", fd, right_fd);
5315 /* redirect from/to same file descriptor? */
5318 /* "echo >&10" and 10 is a fd opened to a sh script? */
5319 if (is_hidden_fd(sv, right_fd)) {
5320 errno = EBADF; /* as if it is closed */
5321 ash_msg_and_raise_error("%d: %m", right_fd);
5325 newfd = openredirect(redir); /* always >= 0 */
5327 /* Descriptor wasn't open before redirect.
5328 * Mark it for close in the future */
5329 if (need_to_remember(sv, fd)) {
5330 goto remember_to_close;
5335 #if ENABLE_ASH_BASH_COMPAT
5338 if (need_to_remember(sv, fd)) {
5339 /* Copy old descriptor */
5340 /* Careful to not accidentally "save"
5341 * to the same fd as right side fd in N>&M */
5342 int minfd = right_fd < 10 ? 10 : right_fd + 1;
5343 i = fcntl(fd, F_DUPFD, minfd);
5344 /* You'd expect copy to be CLOEXECed. Currently these extra "saved" fds
5345 * are closed in popredir() in the child, preventing them from leaking
5346 * into child. (popredir() also cleans up the mess in case of failures)
5351 /* Strange error (e.g. "too many files" EMFILE?) */
5355 ash_msg_and_raise_error("%d: %m", fd);
5358 /* EBADF: it is not open - good, remember to close it */
5361 } else { /* fd is open, save its copy */
5362 /* "exec fd>&-" should not close fds
5363 * which point to script file(s).
5364 * Force them to be restored afterwards */
5365 if (is_hidden_fd(sv, fd))
5366 i |= COPYFD_RESTORE;
5370 sv->two_fd[sv_pos].orig = fd;
5371 sv->two_fd[sv_pos].copy = i;
5375 /* NTOFD/NFROMFD: copy redir->ndup.dupfd to fd */
5376 if (redir->ndup.dupfd < 0) { /* "fd>&-" */
5377 /* Don't want to trigger debugging */
5381 copyfd(redir->ndup.dupfd, fd | COPYFD_EXACT);
5383 } else if (fd != newfd) { /* move newfd to fd */
5384 copyfd(newfd, fd | COPYFD_EXACT);
5385 #if ENABLE_ASH_BASH_COMPAT
5386 if (!(redir->nfile.type == NTO2 && fd == 2))
5390 #if ENABLE_ASH_BASH_COMPAT
5391 if (redir->nfile.type == NTO2 && fd == 1) {
5392 /* We already redirected it to fd 1, now copy it to 2 */
5398 } while ((redir = redir->nfile.next) != NULL);
5401 if ((flags & REDIR_SAVEFD2) && copied_fd2 >= 0)
5402 preverrout_fd = copied_fd2;
5406 * Undo the effects of the last redirection.
5409 popredir(int drop, int restore)
5411 struct redirtab *rp;
5414 if (--g_nullredirs >= 0)
5418 for (i = 0; i < rp->pair_count; i++) {
5419 int fd = rp->two_fd[i].orig;
5420 int copy = rp->two_fd[i].copy;
5421 if (copy == CLOSED) {
5426 if (copy != EMPTY) {
5427 if (!drop || (restore && (copy & COPYFD_RESTORE))) {
5428 copy &= ~COPYFD_RESTORE;
5430 copyfd(copy, fd | COPYFD_EXACT);
5432 close(copy & ~COPYFD_RESTORE);
5435 redirlist = rp->next;
5436 g_nullredirs = rp->nullredirs;
5442 * Undo all redirections. Called on error or interrupt.
5446 * Discard all saved file descriptors.
5449 clearredir(int drop)
5455 popredir(drop, /*restore:*/ 0);
5460 redirectsafe(union node *redir, int flags)
5463 volatile int saveint;
5464 struct jmploc *volatile savehandler = exception_handler;
5465 struct jmploc jmploc;
5468 /* "echo 9>/dev/null; echo >&9; echo result: $?" - result should be 1, not 2! */
5469 err = setjmp(jmploc.loc); // huh?? was = setjmp(jmploc.loc) * 2;
5471 exception_handler = &jmploc;
5472 redirect(redir, flags);
5474 exception_handler = savehandler;
5475 if (err && exception_type != EXERROR)
5476 longjmp(exception_handler->loc, 1);
5477 RESTORE_INT(saveint);
5482 /* ============ Routines to expand arguments to commands
5484 * We have to deal with backquotes, shell variables, and file metacharacters.
5487 #if ENABLE_SH_MATH_SUPPORT
5489 ash_arith(const char *s)
5491 arith_state_t math_state;
5494 math_state.lookupvar = lookupvar;
5495 math_state.setvar = setvar2;
5496 //math_state.endofname = endofname;
5499 result = arith(&math_state, s);
5500 if (math_state.errmsg)
5501 ash_msg_and_raise_error(math_state.errmsg);
5511 #define EXP_FULL 0x1 /* perform word splitting & file globbing */
5512 #define EXP_TILDE 0x2 /* do normal tilde expansion */
5513 #define EXP_VARTILDE 0x4 /* expand tildes in an assignment */
5514 #define EXP_REDIR 0x8 /* file glob for a redirection (1 match only) */
5515 #define EXP_CASE 0x10 /* keeps quotes around for CASE pattern */
5516 #define EXP_RECORD 0x20 /* need to record arguments for ifs breakup */
5517 #define EXP_VARTILDE2 0x40 /* expand tildes after colons only */
5518 #define EXP_WORD 0x80 /* expand word in parameter expansion */
5519 #define EXP_QWORD 0x100 /* expand word in quoted parameter expansion */
5523 #define RMESCAPE_ALLOC 0x1 /* Allocate a new string */
5524 #define RMESCAPE_GLOB 0x2 /* Add backslashes for glob */
5525 #define RMESCAPE_QUOTED 0x4 /* Remove CTLESC unless in quotes */
5526 #define RMESCAPE_GROW 0x8 /* Grow strings instead of stalloc */
5527 #define RMESCAPE_HEAP 0x10 /* Malloc strings instead of stalloc */
5530 * Structure specifying which parts of the string should be searched
5531 * for IFS characters.
5534 struct ifsregion *next; /* next region in list */
5535 int begoff; /* offset of start of region */
5536 int endoff; /* offset of end of region */
5537 int nulonly; /* search for nul bytes only */
5541 struct strlist *list;
5542 struct strlist **lastp;
5545 /* output of current string */
5546 static char *expdest;
5547 /* list of back quote expressions */
5548 static struct nodelist *argbackq;
5549 /* first struct in list of ifs regions */
5550 static struct ifsregion ifsfirst;
5551 /* last struct in list */
5552 static struct ifsregion *ifslastp;
5553 /* holds expanded arg list */
5554 static struct arglist exparg;
5559 #if !ENABLE_SH_MATH_SUPPORT
5560 /* cvtnum() is used even if math support is off (to prepare $? values and such) */
5561 typedef long arith_t;
5562 # define ARITH_FMT "%ld"
5569 expdest = makestrspace(32, expdest);
5570 len = fmtstr(expdest, 32, ARITH_FMT, num);
5571 STADJUST(len, expdest);
5576 esclen(const char *start, const char *p)
5580 while (p > start && (unsigned char)*--p == CTLESC) {
5587 * Remove any CTLESC characters from a string.
5590 rmescapes(char *str, int flag)
5592 static const char qchars[] ALIGN1 = { CTLESC, CTLQUOTEMARK, '\0' };
5596 unsigned protect_against_glob;
5599 p = strpbrk(str, qchars);
5605 if (flag & RMESCAPE_ALLOC) {
5606 size_t len = p - str;
5607 size_t fulllen = len + strlen(p) + 1;
5609 if (flag & RMESCAPE_GROW) {
5610 int strloc = str - (char *)stackblock();
5611 r = makestrspace(fulllen, expdest);
5612 /* p and str may be invalidated by makestrspace */
5613 str = (char *)stackblock() + strloc;
5615 } else if (flag & RMESCAPE_HEAP) {
5616 r = ckmalloc(fulllen);
5618 r = stalloc(fulllen);
5622 q = (char *)memcpy(q, str, len) + len;
5626 inquotes = (flag & RMESCAPE_QUOTED) ^ RMESCAPE_QUOTED;
5627 globbing = flag & RMESCAPE_GLOB;
5628 protect_against_glob = globbing;
5630 if ((unsigned char)*p == CTLQUOTEMARK) {
5631 // TODO: if no RMESCAPE_QUOTED in flags, inquotes never becomes 0
5632 // (alternates between RMESCAPE_QUOTED and ~RMESCAPE_QUOTED). Is it ok?
5633 // Note: both inquotes and protect_against_glob only affect whether
5634 // CTLESC,<ch> gets converted to <ch> or to \<ch>
5635 inquotes = ~inquotes;
5637 protect_against_glob = globbing;
5641 /* naked back slash */
5642 protect_against_glob = 0;
5645 if ((unsigned char)*p == CTLESC) {
5647 if (protect_against_glob && inquotes && *p != '/') {
5651 protect_against_glob = globbing;
5656 if (flag & RMESCAPE_GROW) {
5658 STADJUST(q - r + 1, expdest);
5662 #define pmatch(a, b) !fnmatch((a), (b), 0)
5665 * Prepare a pattern for a expmeta (internal glob(3)) call.
5667 * Returns an stalloced string.
5670 preglob(const char *pattern, int quoted, int flag)
5672 flag |= RMESCAPE_GLOB;
5674 flag |= RMESCAPE_QUOTED;
5676 return rmescapes((char *)pattern, flag);
5680 * Put a string on the stack.
5683 memtodest(const char *p, size_t len, int syntax, int quotes)
5687 q = makestrspace(quotes ? len * 2 : len, q);
5690 unsigned char c = *p++;
5694 int n = SIT(c, syntax);
5695 if (n == CCTL || n == CBACK)
5705 strtodest(const char *p, int syntax, int quotes)
5707 memtodest(p, strlen(p), syntax, quotes);
5711 * Record the fact that we have to scan this region of the
5712 * string for IFS characters.
5715 recordregion(int start, int end, int nulonly)
5717 struct ifsregion *ifsp;
5719 if (ifslastp == NULL) {
5723 ifsp = ckzalloc(sizeof(*ifsp));
5724 /*ifsp->next = NULL; - ckzalloc did it */
5725 ifslastp->next = ifsp;
5729 ifslastp->begoff = start;
5730 ifslastp->endoff = end;
5731 ifslastp->nulonly = nulonly;
5735 removerecordregions(int endoff)
5737 if (ifslastp == NULL)
5740 if (ifsfirst.endoff > endoff) {
5741 while (ifsfirst.next) {
5742 struct ifsregion *ifsp;
5744 ifsp = ifsfirst.next->next;
5745 free(ifsfirst.next);
5746 ifsfirst.next = ifsp;
5749 if (ifsfirst.begoff > endoff) {
5752 ifslastp = &ifsfirst;
5753 ifsfirst.endoff = endoff;
5758 ifslastp = &ifsfirst;
5759 while (ifslastp->next && ifslastp->next->begoff < endoff)
5760 ifslastp = ifslastp->next;
5761 while (ifslastp->next) {
5762 struct ifsregion *ifsp;
5764 ifsp = ifslastp->next->next;
5765 free(ifslastp->next);
5766 ifslastp->next = ifsp;
5769 if (ifslastp->endoff > endoff)
5770 ifslastp->endoff = endoff;
5774 exptilde(char *startp, char *p, int flags)
5780 int quotes = flags & (EXP_FULL | EXP_CASE | EXP_REDIR);
5785 while ((c = *++p) != '\0') {
5792 if (flags & EXP_VARTILDE)
5802 if (*name == '\0') {
5803 home = lookupvar("HOME");
5805 pw = getpwnam(name);
5810 if (!home || !*home)
5813 startloc = expdest - (char *)stackblock();
5814 strtodest(home, SQSYNTAX, quotes);
5815 recordregion(startloc, expdest - (char *)stackblock(), 0);
5823 * Execute a command inside back quotes. If it's a builtin command, we
5824 * want to save its output in a block obtained from malloc. Otherwise
5825 * we fork off a subprocess and get the output of the command via a pipe.
5826 * Should be called with interrupts off.
5828 struct backcmd { /* result of evalbackcmd */
5829 int fd; /* file descriptor to read from */
5830 int nleft; /* number of chars in buffer */
5831 char *buf; /* buffer */
5832 struct job *jp; /* job structure for command */
5835 /* These forward decls are needed to use "eval" code for backticks handling: */
5836 static uint8_t back_exitstatus; /* exit status of backquoted command */
5837 #define EV_EXIT 01 /* exit after evaluating tree */
5838 static void evaltree(union node *, int);
5840 static void FAST_FUNC
5841 evalbackcmd(union node *n, struct backcmd *result)
5852 saveherefd = herefd;
5860 ash_msg_and_raise_error("pipe call failed");
5861 jp = makejob(/*n,*/ 1);
5862 if (forkshell(jp, n, FORK_NOJOB) == 0) {
5867 copyfd(pip[1], 1 | COPYFD_EXACT);
5871 evaltree(n, EV_EXIT); /* actually evaltreenr... */
5875 result->fd = pip[0];
5878 herefd = saveherefd;
5880 TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n",
5881 result->fd, result->buf, result->nleft, result->jp));
5885 * Expand stuff in backwards quotes.
5888 expbackq(union node *cmd, int quoted, int quotes)
5896 int syntax = quoted ? DQSYNTAX : BASESYNTAX;
5897 struct stackmark smark;
5900 setstackmark(&smark);
5902 startloc = dest - (char *)stackblock();
5904 evalbackcmd(cmd, &in);
5905 popstackmark(&smark);
5912 memtodest(p, i, syntax, quotes);
5916 i = nonblock_safe_read(in.fd, buf, sizeof(buf));
5917 TRACE(("expbackq: read returns %d\n", i));
5926 back_exitstatus = waitforjob(in.jp);
5930 /* Eat all trailing newlines */
5932 for (; dest > (char *)stackblock() && dest[-1] == '\n';)
5937 recordregion(startloc, dest - (char *)stackblock(), 0);
5938 TRACE(("evalbackq: size:%d:'%.*s'\n",
5939 (int)((dest - (char *)stackblock()) - startloc),
5940 (int)((dest - (char *)stackblock()) - startloc),
5941 stackblock() + startloc));
5944 #if ENABLE_SH_MATH_SUPPORT
5946 * Expand arithmetic expression. Backup to start of expression,
5947 * evaluate, place result in (backed up) result, adjust string position.
5960 * This routine is slightly over-complicated for
5961 * efficiency. Next we scan backwards looking for the
5962 * start of arithmetic.
5964 start = stackblock();
5971 while ((unsigned char)*p != CTLARI) {
5975 ash_msg_and_raise_error("missing CTLARI (shouldn't happen)");
5980 esc = esclen(start, p);
5990 removerecordregions(begoff);
5997 rmescapes(p + 2, 0);
5999 len = cvtnum(ash_arith(p + 2));
6002 recordregion(begoff, begoff + len, 0);
6006 /* argstr needs it */
6007 static char *evalvar(char *p, int flags, struct strlist *var_str_list);
6010 * Perform variable and command substitution. If EXP_FULL is set, output CTLESC
6011 * characters to allow for further processing. Otherwise treat
6012 * $@ like $* since no splitting will be performed.
6014 * var_str_list (can be NULL) is a list of "VAR=val" strings which take precedence
6015 * over shell varables. Needed for "A=a B=$A; echo $B" case - we use it
6016 * for correct expansion of "B=$A" word.
6019 argstr(char *p, int flags, struct strlist *var_str_list)
6021 static const char spclchars[] ALIGN1 = {
6029 CTLBACKQ | CTLQUOTE,
6030 #if ENABLE_SH_MATH_SUPPORT
6035 const char *reject = spclchars;
6036 int quotes = flags & (EXP_FULL | EXP_CASE | EXP_REDIR); /* do CTLESC */
6037 int breakall = flags & EXP_WORD;
6042 if (!(flags & EXP_VARTILDE)) {
6044 } else if (flags & EXP_VARTILDE2) {
6049 if (flags & EXP_TILDE) {
6052 flags &= ~EXP_TILDE;
6055 if ((unsigned char)*q == CTLESC && (flags & EXP_QWORD))
6058 p = exptilde(p, q, flags);
6061 startloc = expdest - (char *)stackblock();
6065 length += strcspn(p + length, reject);
6069 IF_SH_MATH_SUPPORT(|| c == CTLENDARI)
6071 /* c == '=' || c == ':' || c == CTLENDARI */
6077 expdest = stack_nputstr(p, length, expdest);
6078 newloc = expdest - (char *)stackblock();
6079 if (breakall && !inquotes && newloc > startloc) {
6080 recordregion(startloc, newloc, 0);
6091 if (flags & EXP_VARTILDE2) {
6095 flags |= EXP_VARTILDE2;
6100 * sort of a hack - expand tildes in variable
6101 * assignments (after the first '=' and after ':'s).
6110 case CTLENDVAR: /* ??? */
6113 /* "$@" syntax adherence hack */
6115 && memcmp(p, dolatstr, 4) == 0
6116 && ( p[4] == (char)CTLQUOTEMARK
6117 || (p[4] == (char)CTLENDVAR && p[5] == (char)CTLQUOTEMARK)
6120 p = evalvar(p + 1, flags, /* var_str_list: */ NULL) + 1;
6123 inquotes = !inquotes;
6136 p = evalvar(p, flags, var_str_list);
6140 case CTLBACKQ|CTLQUOTE:
6141 expbackq(argbackq->n, c, quotes);
6142 argbackq = argbackq->next;
6144 #if ENABLE_SH_MATH_SUPPORT
6156 scanleft(char *startp, char *rmesc, char *rmescend UNUSED_PARAM,
6157 char *pattern, int quotes, int zero)
6166 const char *s = loc2;
6173 match = pmatch(pattern, s);
6178 if (quotes && (unsigned char)*loc == CTLESC)
6187 scanright(char *startp, char *rmesc, char *rmescend,
6188 char *pattern, int quotes, int match_at_start)
6190 #if !ENABLE_ASH_OPTIMIZE_FOR_SIZE
6191 int try2optimize = match_at_start;
6197 /* If we called by "${v/pattern/repl}" or "${v//pattern/repl}":
6198 * startp="escaped_value_of_v" rmesc="raw_value_of_v"
6199 * rmescend=""(ptr to NUL in rmesc) pattern="pattern" quotes=match_at_start=1
6201 * loc starts at NUL at the end of startp, loc2 starts at the end of rmesc,
6202 * and on each iteration they go back two/one char until they reach the beginning.
6203 * We try to find a match in "raw_value_of_v", "raw_value_of_", "raw_value_of" etc.
6205 /* TODO: document in what other circumstances we are called. */
6207 for (loc = pattern - 1, loc2 = rmescend; loc >= startp; loc2--) {
6210 const char *s = loc2;
6211 if (match_at_start) {
6215 match = pmatch(pattern, s);
6216 //bb_error_msg("pmatch(pattern:'%s',s:'%s'):%d", pattern, s, match);
6220 #if !ENABLE_ASH_OPTIMIZE_FOR_SIZE
6222 /* Maybe we can optimize this:
6223 * if pattern ends with unescaped *, we can avoid checking
6224 * shorter strings: if "foo*" doesnt match "raw_value_of_v",
6225 * it wont match truncated "raw_value_of_" strings too.
6227 unsigned plen = strlen(pattern);
6228 /* Does it end with "*"? */
6229 if (plen != 0 && pattern[--plen] == '*') {
6230 /* "xxxx*" is not escaped */
6231 /* "xxx\*" is escaped */
6232 /* "xx\\*" is not escaped */
6233 /* "x\\\*" is escaped */
6235 while (plen != 0 && pattern[--plen] == '\\')
6238 break; /* ends with unescaped "*" */
6246 esc = esclen(startp, loc);
6257 static void varunset(const char *, const char *, const char *, int) NORETURN;
6259 varunset(const char *end, const char *var, const char *umsg, int varflags)
6265 msg = "parameter not set";
6267 if ((unsigned char)*end == CTLENDVAR) {
6268 if (varflags & VSNUL)
6274 ash_msg_and_raise_error("%.*s: %s%s", (int)(end - var - 1), var, msg, tail);
6277 #if ENABLE_ASH_BASH_COMPAT
6279 parse_sub_pattern(char *arg, int varflags)
6281 char *idx, *repl = NULL;
6284 //char *org_arg = arg;
6285 //bb_error_msg("arg:'%s' varflags:%x", arg, varflags);
6292 /* Only the first '/' seen is our separator */
6301 * Example: v='ab\c'; echo ${v/\\b/_\\_\z_}
6302 * The result is a_\_z_c (not a\_\_z_c)!
6304 * Enable debug prints in this function and you'll see:
6305 * ash: arg:'\\b/_\\_z_' varflags:d
6306 * ash: pattern:'\\b' repl:'_\_z_'
6307 * That is, \\b is interpreted as \\b, but \\_ as \_!
6308 * IOW: search pattern and replace string treat backslashes
6309 * differently! That is the reason why we check repl below:
6311 if (c == '\\' && *arg == '\\' && repl && !(varflags & VSQUOTE))
6312 arg++; /* skip both '\', not just first one */
6315 //bb_error_msg("pattern:'%s' repl:'%s'", org_arg, repl);
6319 #endif /* ENABLE_ASH_BASH_COMPAT */
6322 subevalvar(char *p, char *varname, int strloc, int subtype,
6323 int startloc, int varflags, int quotes, struct strlist *var_str_list)
6325 struct nodelist *saveargbackq = argbackq;
6328 char *rmesc, *rmescend;
6330 IF_ASH_BASH_COMPAT(const char *repl = NULL;)
6331 IF_ASH_BASH_COMPAT(int pos, len, orig_len;)
6332 int saveherefd = herefd;
6333 int amount, workloc, resetloc;
6335 char *(*scan)(char*, char*, char*, char*, int, int);
6337 //bb_error_msg("subevalvar(p:'%s',varname:'%s',strloc:%d,subtype:%d,startloc:%d,varflags:%x,quotes:%d)",
6338 // p, varname, strloc, subtype, startloc, varflags, quotes);
6341 argstr(p, (subtype != VSASSIGN && subtype != VSQUESTION) ? EXP_CASE : 0,
6343 STPUTC('\0', expdest);
6344 herefd = saveherefd;
6345 argbackq = saveargbackq;
6346 startp = (char *)stackblock() + startloc;
6350 setvar(varname, startp, 0);
6351 amount = startp - expdest;
6352 STADJUST(amount, expdest);
6356 varunset(p, varname, startp, varflags);
6359 #if ENABLE_ASH_BASH_COMPAT
6361 loc = str = stackblock() + strloc;
6362 /* Read POS in ${var:POS:LEN} */
6363 pos = atoi(loc); /* number(loc) errors out on "1:4" */
6364 len = str - startp - 1;
6366 /* *loc != '\0', guaranteed by parser */
6370 /* Adjust the length by the number of escapes */
6371 for (ptr = startp; ptr < (str - 1); ptr++) {
6372 if ((unsigned char)*ptr == CTLESC) {
6380 if (*loc++ == ':') {
6384 /* Skip POS in ${var:POS:LEN} */
6386 while (*loc && *loc != ':') {
6388 * bash complains on: var=qwe; echo ${var:1a:123}
6390 ash_msg_and_raise_error(msg_illnum, str);
6394 if (*loc++ == ':') {
6398 if (pos >= orig_len) {
6402 if (len > (orig_len - pos))
6403 len = orig_len - pos;
6405 for (str = startp; pos; str++, pos--) {
6406 if (quotes && (unsigned char)*str == CTLESC)
6409 for (loc = startp; len; len--) {
6410 if (quotes && (unsigned char)*str == CTLESC)
6415 amount = loc - expdest;
6416 STADJUST(amount, expdest);
6421 resetloc = expdest - (char *)stackblock();
6423 /* We'll comeback here if we grow the stack while handling
6424 * a VSREPLACE or VSREPLACEALL, since our pointers into the
6425 * stack will need rebasing, and we'll need to remove our work
6428 IF_ASH_BASH_COMPAT(restart:)
6430 amount = expdest - ((char *)stackblock() + resetloc);
6431 STADJUST(-amount, expdest);
6432 startp = (char *)stackblock() + startloc;
6435 rmescend = (char *)stackblock() + strloc;
6437 rmesc = rmescapes(startp, RMESCAPE_ALLOC | RMESCAPE_GROW);
6438 if (rmesc != startp) {
6440 startp = (char *)stackblock() + startloc;
6444 str = (char *)stackblock() + strloc;
6445 preglob(str, varflags & VSQUOTE, 0);
6446 workloc = expdest - (char *)stackblock();
6448 #if ENABLE_ASH_BASH_COMPAT
6449 if (subtype == VSREPLACE || subtype == VSREPLACEALL) {
6453 repl = parse_sub_pattern(str, varflags);
6454 //bb_error_msg("repl:'%s'", repl);
6459 /* If there's no pattern to match, return the expansion unmolested */
6468 loc = scanright(idx, rmesc, rmescend, str, quotes, 1);
6469 //bb_error_msg("scanright('%s'):'%s'", str, loc);
6471 /* No match, advance */
6472 char *restart_detect = stackblock();
6474 STPUTC(*idx, expdest);
6475 if (quotes && (unsigned char)*idx == CTLESC) {
6478 STPUTC(*idx, expdest);
6480 if (stackblock() != restart_detect)
6485 /* continue; - prone to quadratic behavior, smarter code: */
6488 if (str[0] == '*') {
6489 /* Pattern is "*foo". If "*foo" does not match "long_string",
6490 * it would never match "ong_string" etc, no point in trying.
6497 if (subtype == VSREPLACEALL) {
6499 if (quotes && (unsigned char)*idx == CTLESC)
6508 //bb_error_msg("repl:'%s'", repl);
6509 for (loc = (char*)repl; *loc; loc++) {
6510 char *restart_detect = stackblock();
6511 if (quotes && *loc == '\\') {
6512 STPUTC(CTLESC, expdest);
6515 STPUTC(*loc, expdest);
6516 if (stackblock() != restart_detect)
6521 if (subtype == VSREPLACE) {
6522 //bb_error_msg("tail:'%s', quotes:%x", idx, quotes);
6524 char *restart_detect = stackblock();
6525 STPUTC(*idx, expdest);
6526 if (stackblock() != restart_detect)
6535 /* We've put the replaced text into a buffer at workloc, now
6536 * move it to the right place and adjust the stack.
6538 STPUTC('\0', expdest);
6539 startp = (char *)stackblock() + startloc;
6540 memmove(startp, (char *)stackblock() + workloc, len + 1);
6541 //bb_error_msg("startp:'%s'", startp);
6542 amount = expdest - (startp + len);
6543 STADJUST(-amount, expdest);
6546 #endif /* ENABLE_ASH_BASH_COMPAT */
6548 subtype -= VSTRIMRIGHT;
6550 if (subtype < 0 || subtype > 7)
6553 /* zero = (subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX) */
6554 zero = subtype >> 1;
6555 /* VSTRIMLEFT/VSTRIMRIGHTMAX -> scanleft */
6556 scan = (subtype & 1) ^ zero ? scanleft : scanright;
6558 loc = scan(startp, rmesc, rmescend, str, quotes, zero);
6561 memmove(startp, loc, str - loc);
6562 loc = startp + (str - loc) - 1;
6565 amount = loc - expdest;
6566 STADJUST(amount, expdest);
6572 * Add the value of a specialized variable to the stack string.
6573 * name parameter (examples):
6574 * ash -c 'echo $1' name:'1='
6575 * ash -c 'echo $qwe' name:'qwe='
6576 * ash -c 'echo $$' name:'$='
6577 * ash -c 'echo ${$}' name:'$='
6578 * ash -c 'echo ${$##q}' name:'$=q'
6579 * ash -c 'echo ${#$}' name:'$='
6580 * note: examples with bad shell syntax:
6581 * ash -c 'echo ${#$1}' name:'$=1'
6582 * ash -c 'echo ${#1#}' name:'1=#'
6584 static NOINLINE ssize_t
6585 varvalue(char *name, int varflags, int flags, struct strlist *var_str_list)
6592 int subtype = varflags & VSTYPE;
6593 int quotes = flags & (EXP_FULL | EXP_CASE | EXP_REDIR);
6594 int quoted = varflags & VSQUOTE;
6595 int syntax = quoted ? DQSYNTAX : BASESYNTAX;
6605 num = shellparam.nparam;
6613 goto check_1char_name;
6615 expdest = makestrspace(NOPTS, expdest);
6616 for (i = NOPTS - 1; i >= 0; i--) {
6618 USTPUTC(optletters(i), expdest);
6624 /* handles cases similar to ${#$1} */
6625 if (name[2] != '\0')
6626 raise_error_syntax("bad substitution");
6633 if (quoted && (flags & EXP_FULL)) {
6634 /* note: this is not meant as PEOF value */
6635 sep = 1 << CHAR_BIT;
6640 sep = ifsset() ? (unsigned char)(ifsval()[0]) : ' ';
6641 i = SIT(sep, syntax);
6642 if (quotes && (i == CCTL || i == CBACK))
6648 while ((p = *ap++) != NULL) {
6651 partlen = strlen(p);
6654 if (!(subtype == VSPLUS || subtype == VSLENGTH))
6655 memtodest(p, partlen, syntax, quotes);
6661 if (subtype == VSPLUS || subtype == VSLENGTH) {
6667 /* note: may put NUL despite sep != 0
6668 * (see sep = 1 << CHAR_BIT above) */
6674 } /* case '@' and '*' */
6685 num = atoi(name); /* number(name) fails on ${N#str} etc */
6686 if (num < 0 || num > shellparam.nparam)
6688 p = num ? shellparam.p[num - 1] : arg0;
6691 /* NB: name has form "VAR=..." */
6693 /* "A=a B=$A" case: var_str_list is a list of "A=a" strings
6694 * which should be considered before we check variables. */
6696 unsigned name_len = (strchrnul(name, '=') - name) + 1;
6700 str = var_str_list->text;
6701 eq = strchr(str, '=');
6702 if (!eq) /* stop at first non-assignment */
6705 if (name_len == (unsigned)(eq - str)
6706 && strncmp(str, name, name_len) == 0
6709 /* goto value; - WRONG! */
6710 /* think "A=1 A=2 B=$A" */
6712 var_str_list = var_str_list->next;
6713 } while (var_str_list);
6717 p = lookupvar(name);
6723 if (!(subtype == VSPLUS || subtype == VSLENGTH))
6724 memtodest(p, len, syntax, quotes);
6728 if (subtype == VSPLUS || subtype == VSLENGTH)
6729 STADJUST(-len, expdest);
6734 * Expand a variable, and return a pointer to the next character in the
6738 evalvar(char *p, int flags, struct strlist *var_str_list)
6749 varflags = (unsigned char) *p++;
6750 subtype = varflags & VSTYPE;
6751 quoted = varflags & VSQUOTE;
6753 easy = (!quoted || (*var == '@' && shellparam.nparam));
6754 startloc = expdest - (char *)stackblock();
6755 p = strchr(p, '=') + 1; //TODO: use var_end(p)?
6758 varlen = varvalue(var, varflags, flags, var_str_list);
6759 if (varflags & VSNUL)
6762 if (subtype == VSPLUS) {
6763 varlen = -1 - varlen;
6767 if (subtype == VSMINUS) {
6772 flags | (quoted ? EXP_TILDE|EXP_QWORD : EXP_TILDE|EXP_WORD),
6782 if (subtype == VSASSIGN || subtype == VSQUESTION) {
6784 if (subevalvar(p, var, /* strloc: */ 0,
6785 subtype, startloc, varflags,
6791 * Remove any recorded regions beyond
6794 removerecordregions(startloc);
6804 if (varlen < 0 && uflag)
6805 varunset(p, var, 0, 0);
6807 if (subtype == VSLENGTH) {
6808 cvtnum(varlen > 0 ? varlen : 0);
6812 if (subtype == VSNORMAL) {
6823 case VSTRIMRIGHTMAX:
6824 #if ENABLE_ASH_BASH_COMPAT
6837 * Terminate the string and start recording the pattern
6840 STPUTC('\0', expdest);
6841 patloc = expdest - (char *)stackblock();
6842 if (NULL == subevalvar(p, /* varname: */ NULL, patloc, subtype,
6844 //TODO: | EXP_REDIR too? All other such places do it too
6845 /* quotes: */ flags & (EXP_FULL | EXP_CASE),
6848 int amount = expdest - (
6849 (char *)stackblock() + patloc - 1
6851 STADJUST(-amount, expdest);
6853 /* Remove any recorded regions beyond start of variable */
6854 removerecordregions(startloc);
6856 recordregion(startloc, expdest - (char *)stackblock(), quoted);
6860 if (subtype != VSNORMAL) { /* skip to end of alternative */
6863 unsigned char c = *p++;
6866 else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) {
6868 argbackq = argbackq->next;
6869 } else if (c == CTLVAR) {
6870 if ((*p++ & VSTYPE) != VSNORMAL)
6872 } else if (c == CTLENDVAR) {
6882 * Break the argument string into pieces based upon IFS and add the
6883 * strings to the argument list. The regions of the string to be
6884 * searched for IFS characters have been stored by recordregion.
6887 ifsbreakup(char *string, struct arglist *arglist)
6889 struct ifsregion *ifsp;
6894 const char *ifs, *realifs;
6899 if (ifslastp != NULL) {
6902 realifs = ifsset() ? ifsval() : defifs;
6905 p = string + ifsp->begoff;
6906 nulonly = ifsp->nulonly;
6907 ifs = nulonly ? nullstr : realifs;
6909 while (p < string + ifsp->endoff) {
6911 if ((unsigned char)*p == CTLESC)
6913 if (!strchr(ifs, *p)) {
6918 ifsspc = (strchr(defifs, *p) != NULL);
6919 /* Ignore IFS whitespace at start */
6920 if (q == start && ifsspc) {
6926 sp = stzalloc(sizeof(*sp));
6928 *arglist->lastp = sp;
6929 arglist->lastp = &sp->next;
6933 if (p >= string + ifsp->endoff) {
6937 if ((unsigned char)*p == CTLESC)
6939 if (strchr(ifs, *p) == NULL) {
6943 if (strchr(defifs, *p) == NULL) {
6958 } while (ifsp != NULL);
6967 sp = stzalloc(sizeof(*sp));
6969 *arglist->lastp = sp;
6970 arglist->lastp = &sp->next;
6976 struct ifsregion *p;
6981 struct ifsregion *ifsp;
6987 ifsfirst.next = NULL;
6992 * Add a file name to the list.
6995 addfname(const char *name)
6999 sp = stzalloc(sizeof(*sp));
7000 sp->text = ststrdup(name);
7002 exparg.lastp = &sp->next;
7006 * Do metacharacter (i.e. *, ?, [...]) expansion.
7009 expmeta(char *expdir, char *enddir, char *name)
7024 for (p = name; *p; p++) {
7025 if (*p == '*' || *p == '?')
7027 else if (*p == '[') {
7034 if (*q == '/' || *q == '\0')
7041 } else if (*p == '\\')
7043 else if (*p == '/') {
7050 if (metaflag == 0) { /* we've reached the end of the file name */
7051 if (enddir != expdir)
7059 if (metaflag == 0 || lstat(expdir, &statb) >= 0)
7070 } while (p < start);
7072 if (enddir == expdir) {
7074 } else if (enddir == expdir + 1 && *expdir == '/') {
7083 if (enddir != expdir)
7085 if (*endname == 0) {
7097 while (!pending_int && (dp = readdir(dirp)) != NULL) {
7098 if (dp->d_name[0] == '.' && !matchdot)
7100 if (pmatch(start, dp->d_name)) {
7102 strcpy(enddir, dp->d_name);
7105 for (p = enddir, cp = dp->d_name; (*p++ = *cp++) != '\0';)
7108 expmeta(expdir, p, endname);
7117 static struct strlist *
7118 msort(struct strlist *list, int len)
7120 struct strlist *p, *q = NULL;
7121 struct strlist **lpp;
7129 for (n = half; --n >= 0;) {
7133 q->next = NULL; /* terminate first half of list */
7134 q = msort(list, half); /* sort first half of list */
7135 p = msort(p, len - half); /* sort second half */
7138 #if ENABLE_LOCALE_SUPPORT
7139 if (strcoll(p->text, q->text) < 0)
7141 if (strcmp(p->text, q->text) < 0)
7165 * Sort the results of file name expansion. It calculates the number of
7166 * strings to sort and then calls msort (short for merge sort) to do the
7169 static struct strlist *
7170 expsort(struct strlist *str)
7176 for (sp = str; sp; sp = sp->next)
7178 return msort(str, len);
7182 expandmeta(struct strlist *str /*, int flag*/)
7184 static const char metachars[] ALIGN1 = {
7187 /* TODO - EXP_REDIR */
7191 struct strlist **savelastp;
7197 if (!strpbrk(str->text, metachars))
7199 savelastp = exparg.lastp;
7202 p = preglob(str->text, 0, RMESCAPE_ALLOC | RMESCAPE_HEAP);
7204 int i = strlen(str->text);
7205 expdir = ckmalloc(i < 2048 ? 2048 : i); /* XXX */
7207 expmeta(expdir, expdir, p);
7212 if (exparg.lastp == savelastp) {
7217 *exparg.lastp = str;
7218 rmescapes(str->text, 0);
7219 exparg.lastp = &str->next;
7221 *exparg.lastp = NULL;
7222 *savelastp = sp = expsort(*savelastp);
7223 while (sp->next != NULL)
7225 exparg.lastp = &sp->next;
7232 * Perform variable substitution and command substitution on an argument,
7233 * placing the resulting list of arguments in arglist. If EXP_FULL is true,
7234 * perform splitting and file name expansion. When arglist is NULL, perform
7235 * here document expansion.
7238 expandarg(union node *arg, struct arglist *arglist, int flag)
7243 argbackq = arg->narg.backquote;
7244 STARTSTACKSTR(expdest);
7245 ifsfirst.next = NULL;
7247 argstr(arg->narg.text, flag,
7248 /* var_str_list: */ arglist ? arglist->list : NULL);
7249 p = _STPUTC('\0', expdest);
7251 if (arglist == NULL) {
7252 return; /* here document expanded */
7254 p = grabstackstr(p);
7255 exparg.lastp = &exparg.list;
7259 if (flag & EXP_FULL) {
7260 ifsbreakup(p, &exparg);
7261 *exparg.lastp = NULL;
7262 exparg.lastp = &exparg.list;
7263 expandmeta(exparg.list /*, flag*/);
7265 if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */
7267 sp = stzalloc(sizeof(*sp));
7270 exparg.lastp = &sp->next;
7274 *exparg.lastp = NULL;
7276 *arglist->lastp = exparg.list;
7277 arglist->lastp = exparg.lastp;
7282 * Expand shell variables and backquotes inside a here document.
7285 expandhere(union node *arg, int fd)
7288 expandarg(arg, (struct arglist *)NULL, 0);
7289 full_write(fd, stackblock(), expdest - (char *)stackblock());
7293 * Returns true if the pattern matches the string.
7296 patmatch(char *pattern, const char *string)
7298 return pmatch(preglob(pattern, 0, 0), string);
7302 * See if a pattern matches in a case statement.
7305 casematch(union node *pattern, char *val)
7307 struct stackmark smark;
7310 setstackmark(&smark);
7311 argbackq = pattern->narg.backquote;
7312 STARTSTACKSTR(expdest);
7314 argstr(pattern->narg.text, EXP_TILDE | EXP_CASE,
7315 /* var_str_list: */ NULL);
7316 STACKSTRNUL(expdest);
7317 result = patmatch(stackblock(), val);
7318 popstackmark(&smark);
7323 /* ============ find_command */
7327 int (*builtin)(int, char **) FAST_FUNC;
7328 /* unsigned flags; */
7330 #define IS_BUILTIN_SPECIAL(b) ((b)->name[0] & 1)
7331 /* "regular" builtins always take precedence over commands,
7332 * regardless of PATH=....%builtin... position */
7333 #define IS_BUILTIN_REGULAR(b) ((b)->name[0] & 2)
7334 #define IS_BUILTIN_ASSIGN(b) ((b)->name[0] & 4)
7337 smallint cmdtype; /* CMDxxx */
7340 /* index >= 0 for commands without path (slashes) */
7341 /* (TODO: what exactly does the value mean? PATH position?) */
7342 /* index == -1 for commands with slashes */
7343 /* index == (-2 - applet_no) for NOFORK applets */
7344 const struct builtincmd *cmd;
7345 struct funcnode *func;
7348 /* values of cmdtype */
7349 #define CMDUNKNOWN -1 /* no entry in table for command */
7350 #define CMDNORMAL 0 /* command is an executable program */
7351 #define CMDFUNCTION 1 /* command is a shell function */
7352 #define CMDBUILTIN 2 /* command is a shell builtin */
7354 /* action to find_command() */
7355 #define DO_ERR 0x01 /* prints errors */
7356 #define DO_ABS 0x02 /* checks absolute paths */
7357 #define DO_NOFUNC 0x04 /* don't return shell functions, for command */
7358 #define DO_ALTPATH 0x08 /* using alternate path */
7359 #define DO_ALTBLTIN 0x20 /* %builtin in alt. path */
7361 static void find_command(char *, struct cmdentry *, int, const char *);
7364 /* ============ Hashing commands */
7367 * When commands are first encountered, they are entered in a hash table.
7368 * This ensures that a full path search will not have to be done for them
7369 * on each invocation.
7371 * We should investigate converting to a linear search, even though that
7372 * would make the command name "hash" a misnomer.
7376 struct tblentry *next; /* next entry in hash chain */
7377 union param param; /* definition of builtin function */
7378 smallint cmdtype; /* CMDxxx */
7379 char rehash; /* if set, cd done since entry created */
7380 char cmdname[1]; /* name of command */
7383 static struct tblentry **cmdtable;
7384 #define INIT_G_cmdtable() do { \
7385 cmdtable = xzalloc(CMDTABLESIZE * sizeof(cmdtable[0])); \
7388 static int builtinloc = -1; /* index in path of %builtin, or -1 */
7392 tryexec(IF_FEATURE_SH_STANDALONE(int applet_no,) char *cmd, char **argv, char **envp)
7394 #if ENABLE_FEATURE_SH_STANDALONE
7395 if (applet_no >= 0) {
7396 if (APPLET_IS_NOEXEC(applet_no)) {
7400 run_applet_no_and_exit(applet_no, argv);
7402 /* re-exec ourselves with the new arguments */
7403 execve(bb_busybox_exec_path, argv, envp);
7404 /* If they called chroot or otherwise made the binary no longer
7405 * executable, fall through */
7412 execve(cmd, argv, envp);
7413 } while (errno == EINTR);
7415 execve(cmd, argv, envp);
7417 if (cmd == (char*) bb_busybox_exec_path) {
7418 /* We already visited ENOEXEC branch below, don't do it again */
7419 //TODO: try execve(initial_argv0_of_shell, argv, envp) before giving up?
7423 if (errno == ENOEXEC) {
7424 /* Run "cmd" as a shell script:
7425 * http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html
7426 * "If the execve() function fails with ENOEXEC, the shell
7427 * shall execute a command equivalent to having a shell invoked
7428 * with the command name as its first operand,
7429 * with any remaining arguments passed to the new shell"
7431 * That is, do not use $SHELL, user's shell, or /bin/sh;
7432 * just call ourselves.
7437 for (ap = argv; *ap; ap++)
7439 new = ckmalloc((ap - argv + 2) * sizeof(new[0]));
7440 new[0] = (char*) "ash";
7443 while ((*ap++ = *++argv) != NULL)
7445 cmd = (char*) bb_busybox_exec_path;
7452 * Exec a program. Never returns. If you change this routine, you may
7453 * have to change the find_command routine as well.
7455 static void shellexec(char **, const char *, int) NORETURN;
7457 shellexec(char **argv, const char *path, int idx)
7463 #if ENABLE_FEATURE_SH_STANDALONE
7467 clearredir(/*drop:*/ 1);
7468 envp = listvars(VEXPORT, VUNSET, /*end:*/ NULL);
7469 if (strchr(argv[0], '/') != NULL
7470 #if ENABLE_FEATURE_SH_STANDALONE
7471 || (applet_no = find_applet_by_name(argv[0])) >= 0
7474 tryexec(IF_FEATURE_SH_STANDALONE(applet_no,) argv[0], argv, envp);
7478 while ((cmdname = path_advance(&path, argv[0])) != NULL) {
7479 if (--idx < 0 && pathopt == NULL) {
7480 tryexec(IF_FEATURE_SH_STANDALONE(-1,) cmdname, argv, envp);
7481 if (errno != ENOENT && errno != ENOTDIR)
7488 /* Map to POSIX errors */
7500 exitstatus = exerrno;
7501 TRACE(("shellexec failed for %s, errno %d, suppress_int %d\n",
7502 argv[0], e, suppress_int));
7503 ash_msg_and_raise(EXEXEC, "%s: %s", argv[0], errmsg(e, "not found"));
7508 printentry(struct tblentry *cmdp)
7514 idx = cmdp->param.index;
7517 name = path_advance(&path, cmdp->cmdname);
7519 } while (--idx >= 0);
7520 out1fmt("%s%s\n", name, (cmdp->rehash ? "*" : nullstr));
7524 * Clear out command entries. The argument specifies the first entry in
7525 * PATH which has changed.
7528 clearcmdentry(int firstchange)
7530 struct tblentry **tblp;
7531 struct tblentry **pp;
7532 struct tblentry *cmdp;
7535 for (tblp = cmdtable; tblp < &cmdtable[CMDTABLESIZE]; tblp++) {
7537 while ((cmdp = *pp) != NULL) {
7538 if ((cmdp->cmdtype == CMDNORMAL &&
7539 cmdp->param.index >= firstchange)
7540 || (cmdp->cmdtype == CMDBUILTIN &&
7541 builtinloc >= firstchange)
7554 * Locate a command in the command hash table. If "add" is nonzero,
7555 * add the command to the table if it is not already present. The
7556 * variable "lastcmdentry" is set to point to the address of the link
7557 * pointing to the entry, so that delete_cmd_entry can delete the
7560 * Interrupts must be off if called with add != 0.
7562 static struct tblentry **lastcmdentry;
7564 static struct tblentry *
7565 cmdlookup(const char *name, int add)
7567 unsigned int hashval;
7569 struct tblentry *cmdp;
7570 struct tblentry **pp;
7573 hashval = (unsigned char)*p << 4;
7575 hashval += (unsigned char)*p++;
7577 pp = &cmdtable[hashval % CMDTABLESIZE];
7578 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7579 if (strcmp(cmdp->cmdname, name) == 0)
7583 if (add && cmdp == NULL) {
7584 cmdp = *pp = ckzalloc(sizeof(struct tblentry)
7586 /* + 1 - already done because
7587 * tblentry::cmdname is char[1] */);
7588 /*cmdp->next = NULL; - ckzalloc did it */
7589 cmdp->cmdtype = CMDUNKNOWN;
7590 strcpy(cmdp->cmdname, name);
7597 * Delete the command entry returned on the last lookup.
7600 delete_cmd_entry(void)
7602 struct tblentry *cmdp;
7605 cmdp = *lastcmdentry;
7606 *lastcmdentry = cmdp->next;
7607 if (cmdp->cmdtype == CMDFUNCTION)
7608 freefunc(cmdp->param.func);
7614 * Add a new command entry, replacing any existing command entry for
7615 * the same name - except special builtins.
7618 addcmdentry(char *name, struct cmdentry *entry)
7620 struct tblentry *cmdp;
7622 cmdp = cmdlookup(name, 1);
7623 if (cmdp->cmdtype == CMDFUNCTION) {
7624 freefunc(cmdp->param.func);
7626 cmdp->cmdtype = entry->cmdtype;
7627 cmdp->param = entry->u;
7631 static int FAST_FUNC
7632 hashcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
7634 struct tblentry **pp;
7635 struct tblentry *cmdp;
7637 struct cmdentry entry;
7640 if (nextopt("r") != '\0') {
7645 if (*argptr == NULL) {
7646 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
7647 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7648 if (cmdp->cmdtype == CMDNORMAL)
7656 while ((name = *argptr) != NULL) {
7657 cmdp = cmdlookup(name, 0);
7659 && (cmdp->cmdtype == CMDNORMAL
7660 || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))
7664 find_command(name, &entry, DO_ERR, pathval());
7665 if (entry.cmdtype == CMDUNKNOWN)
7673 * Called when a cd is done. Marks all commands so the next time they
7674 * are executed they will be rehashed.
7679 struct tblentry **pp;
7680 struct tblentry *cmdp;
7682 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
7683 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7684 if (cmdp->cmdtype == CMDNORMAL
7685 || (cmdp->cmdtype == CMDBUILTIN
7686 && !IS_BUILTIN_REGULAR(cmdp->param.cmd)
7696 * Fix command hash table when PATH changed.
7697 * Called before PATH is changed. The argument is the new value of PATH;
7698 * pathval() still returns the old value at this point.
7699 * Called with interrupts off.
7701 static void FAST_FUNC
7702 changepath(const char *new)
7710 firstchange = 9999; /* assume no change */
7716 if ((*old == '\0' && *new == ':')
7717 || (*old == ':' && *new == '\0')
7721 old = new; /* ignore subsequent differences */
7725 if (*new == '%' && idx_bltin < 0 && prefix(new + 1, "builtin"))
7732 if (builtinloc < 0 && idx_bltin >= 0)
7733 builtinloc = idx_bltin; /* zap builtins */
7734 if (builtinloc >= 0 && idx_bltin < 0)
7736 clearcmdentry(firstchange);
7737 builtinloc = idx_bltin;
7752 #define TENDBQUOTE 12
7769 typedef smallint token_id_t;
7771 /* first char is indicating which tokens mark the end of a list */
7772 static const char *const tokname_array[] = {
7786 #define KWDOFFSET 13
7787 /* the following are keywords */
7806 /* Wrapper around strcmp for qsort/bsearch/... */
7808 pstrcmp(const void *a, const void *b)
7810 return strcmp((char*) a, (*(char**) b) + 1);
7813 static const char *const *
7814 findkwd(const char *s)
7816 return bsearch(s, tokname_array + KWDOFFSET,
7817 ARRAY_SIZE(tokname_array) - KWDOFFSET,
7818 sizeof(tokname_array[0]), pstrcmp);
7822 * Locate and print what a word is...
7825 describe_command(char *command, int describe_command_verbose)
7827 struct cmdentry entry;
7828 struct tblentry *cmdp;
7829 #if ENABLE_ASH_ALIAS
7830 const struct alias *ap;
7832 const char *path = pathval();
7834 if (describe_command_verbose) {
7838 /* First look at the keywords */
7839 if (findkwd(command)) {
7840 out1str(describe_command_verbose ? " is a shell keyword" : command);
7844 #if ENABLE_ASH_ALIAS
7845 /* Then look at the aliases */
7846 ap = lookupalias(command, 0);
7848 if (!describe_command_verbose) {
7853 out1fmt(" is an alias for %s", ap->val);
7857 /* Then check if it is a tracked alias */
7858 cmdp = cmdlookup(command, 0);
7860 entry.cmdtype = cmdp->cmdtype;
7861 entry.u = cmdp->param;
7863 /* Finally use brute force */
7864 find_command(command, &entry, DO_ABS, path);
7867 switch (entry.cmdtype) {
7869 int j = entry.u.index;
7875 p = path_advance(&path, command);
7879 if (describe_command_verbose) {
7881 (cmdp ? " a tracked alias for" : nullstr), p
7890 if (describe_command_verbose) {
7891 out1str(" is a shell function");
7898 if (describe_command_verbose) {
7899 out1fmt(" is a %sshell builtin",
7900 IS_BUILTIN_SPECIAL(entry.u.cmd) ?
7901 "special " : nullstr
7909 if (describe_command_verbose) {
7910 out1str(": not found\n");
7919 static int FAST_FUNC
7920 typecmd(int argc UNUSED_PARAM, char **argv)
7926 /* type -p ... ? (we don't bother checking for 'p') */
7927 if (argv[1] && argv[1][0] == '-') {
7932 err |= describe_command(argv[i++], verbose);
7937 #if ENABLE_ASH_CMDCMD
7938 static int FAST_FUNC
7939 commandcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
7947 while ((c = nextopt("pvV")) != '\0')
7949 verify |= VERIFY_VERBOSE;
7951 verify |= VERIFY_BRIEF;
7956 /* Mimic bash: just "command -v" doesn't complain, it's a nop */
7957 if (verify && (*argptr != NULL)) {
7958 return describe_command(*argptr, verify - VERIFY_BRIEF);
7966 /* ============ eval.c */
7968 static int funcblocksize; /* size of structures in function */
7969 static int funcstringsize; /* size of strings in node */
7970 static void *funcblock; /* block to allocate function from */
7971 static char *funcstring; /* block to allocate strings from */
7973 /* flags in argument to evaltree */
7974 #define EV_EXIT 01 /* exit after evaluating tree */
7975 #define EV_TESTED 02 /* exit status is checked; ignore -e flag */
7976 #define EV_BACKCMD 04 /* command executing within back quotes */
7978 static const uint8_t nodesize[N_NUMBER] = {
7979 [NCMD ] = SHELL_ALIGN(sizeof(struct ncmd)),
7980 [NPIPE ] = SHELL_ALIGN(sizeof(struct npipe)),
7981 [NREDIR ] = SHELL_ALIGN(sizeof(struct nredir)),
7982 [NBACKGND ] = SHELL_ALIGN(sizeof(struct nredir)),
7983 [NSUBSHELL] = SHELL_ALIGN(sizeof(struct nredir)),
7984 [NAND ] = SHELL_ALIGN(sizeof(struct nbinary)),
7985 [NOR ] = SHELL_ALIGN(sizeof(struct nbinary)),
7986 [NSEMI ] = SHELL_ALIGN(sizeof(struct nbinary)),
7987 [NIF ] = SHELL_ALIGN(sizeof(struct nif)),
7988 [NWHILE ] = SHELL_ALIGN(sizeof(struct nbinary)),
7989 [NUNTIL ] = SHELL_ALIGN(sizeof(struct nbinary)),
7990 [NFOR ] = SHELL_ALIGN(sizeof(struct nfor)),
7991 [NCASE ] = SHELL_ALIGN(sizeof(struct ncase)),
7992 [NCLIST ] = SHELL_ALIGN(sizeof(struct nclist)),
7993 [NDEFUN ] = SHELL_ALIGN(sizeof(struct narg)),
7994 [NARG ] = SHELL_ALIGN(sizeof(struct narg)),
7995 [NTO ] = SHELL_ALIGN(sizeof(struct nfile)),
7996 #if ENABLE_ASH_BASH_COMPAT
7997 [NTO2 ] = SHELL_ALIGN(sizeof(struct nfile)),
7999 [NCLOBBER ] = SHELL_ALIGN(sizeof(struct nfile)),
8000 [NFROM ] = SHELL_ALIGN(sizeof(struct nfile)),
8001 [NFROMTO ] = SHELL_ALIGN(sizeof(struct nfile)),
8002 [NAPPEND ] = SHELL_ALIGN(sizeof(struct nfile)),
8003 [NTOFD ] = SHELL_ALIGN(sizeof(struct ndup)),
8004 [NFROMFD ] = SHELL_ALIGN(sizeof(struct ndup)),
8005 [NHERE ] = SHELL_ALIGN(sizeof(struct nhere)),
8006 [NXHERE ] = SHELL_ALIGN(sizeof(struct nhere)),
8007 [NNOT ] = SHELL_ALIGN(sizeof(struct nnot)),
8010 static void calcsize(union node *n);
8013 sizenodelist(struct nodelist *lp)
8016 funcblocksize += SHELL_ALIGN(sizeof(struct nodelist));
8023 calcsize(union node *n)
8027 funcblocksize += nodesize[n->type];
8030 calcsize(n->ncmd.redirect);
8031 calcsize(n->ncmd.args);
8032 calcsize(n->ncmd.assign);
8035 sizenodelist(n->npipe.cmdlist);
8040 calcsize(n->nredir.redirect);
8041 calcsize(n->nredir.n);
8048 calcsize(n->nbinary.ch2);
8049 calcsize(n->nbinary.ch1);
8052 calcsize(n->nif.elsepart);
8053 calcsize(n->nif.ifpart);
8054 calcsize(n->nif.test);
8057 funcstringsize += strlen(n->nfor.var) + 1;
8058 calcsize(n->nfor.body);
8059 calcsize(n->nfor.args);
8062 calcsize(n->ncase.cases);
8063 calcsize(n->ncase.expr);
8066 calcsize(n->nclist.body);
8067 calcsize(n->nclist.pattern);
8068 calcsize(n->nclist.next);
8072 sizenodelist(n->narg.backquote);
8073 funcstringsize += strlen(n->narg.text) + 1;
8074 calcsize(n->narg.next);
8077 #if ENABLE_ASH_BASH_COMPAT
8084 calcsize(n->nfile.fname);
8085 calcsize(n->nfile.next);
8089 calcsize(n->ndup.vname);
8090 calcsize(n->ndup.next);
8094 calcsize(n->nhere.doc);
8095 calcsize(n->nhere.next);
8098 calcsize(n->nnot.com);
8104 nodeckstrdup(char *s)
8106 char *rtn = funcstring;
8108 strcpy(funcstring, s);
8109 funcstring += strlen(s) + 1;
8113 static union node *copynode(union node *);
8115 static struct nodelist *
8116 copynodelist(struct nodelist *lp)
8118 struct nodelist *start;
8119 struct nodelist **lpp;
8124 funcblock = (char *) funcblock + SHELL_ALIGN(sizeof(struct nodelist));
8125 (*lpp)->n = copynode(lp->n);
8127 lpp = &(*lpp)->next;
8134 copynode(union node *n)
8141 funcblock = (char *) funcblock + nodesize[n->type];
8145 new->ncmd.redirect = copynode(n->ncmd.redirect);
8146 new->ncmd.args = copynode(n->ncmd.args);
8147 new->ncmd.assign = copynode(n->ncmd.assign);
8150 new->npipe.cmdlist = copynodelist(n->npipe.cmdlist);
8151 new->npipe.pipe_backgnd = n->npipe.pipe_backgnd;
8156 new->nredir.redirect = copynode(n->nredir.redirect);
8157 new->nredir.n = copynode(n->nredir.n);
8164 new->nbinary.ch2 = copynode(n->nbinary.ch2);
8165 new->nbinary.ch1 = copynode(n->nbinary.ch1);
8168 new->nif.elsepart = copynode(n->nif.elsepart);
8169 new->nif.ifpart = copynode(n->nif.ifpart);
8170 new->nif.test = copynode(n->nif.test);
8173 new->nfor.var = nodeckstrdup(n->nfor.var);
8174 new->nfor.body = copynode(n->nfor.body);
8175 new->nfor.args = copynode(n->nfor.args);
8178 new->ncase.cases = copynode(n->ncase.cases);
8179 new->ncase.expr = copynode(n->ncase.expr);
8182 new->nclist.body = copynode(n->nclist.body);
8183 new->nclist.pattern = copynode(n->nclist.pattern);
8184 new->nclist.next = copynode(n->nclist.next);
8188 new->narg.backquote = copynodelist(n->narg.backquote);
8189 new->narg.text = nodeckstrdup(n->narg.text);
8190 new->narg.next = copynode(n->narg.next);
8193 #if ENABLE_ASH_BASH_COMPAT
8200 new->nfile.fname = copynode(n->nfile.fname);
8201 new->nfile.fd = n->nfile.fd;
8202 new->nfile.next = copynode(n->nfile.next);
8206 new->ndup.vname = copynode(n->ndup.vname);
8207 new->ndup.dupfd = n->ndup.dupfd;
8208 new->ndup.fd = n->ndup.fd;
8209 new->ndup.next = copynode(n->ndup.next);
8213 new->nhere.doc = copynode(n->nhere.doc);
8214 new->nhere.fd = n->nhere.fd;
8215 new->nhere.next = copynode(n->nhere.next);
8218 new->nnot.com = copynode(n->nnot.com);
8221 new->type = n->type;
8226 * Make a copy of a parse tree.
8228 static struct funcnode *
8229 copyfunc(union node *n)
8234 funcblocksize = offsetof(struct funcnode, n);
8237 blocksize = funcblocksize;
8238 f = ckmalloc(blocksize + funcstringsize);
8239 funcblock = (char *) f + offsetof(struct funcnode, n);
8240 funcstring = (char *) f + blocksize;
8247 * Define a shell function.
8250 defun(char *name, union node *func)
8252 struct cmdentry entry;
8255 entry.cmdtype = CMDFUNCTION;
8256 entry.u.func = copyfunc(func);
8257 addcmdentry(name, &entry);
8261 /* Reasons for skipping commands (see comment on breakcmd routine) */
8262 #define SKIPBREAK (1 << 0)
8263 #define SKIPCONT (1 << 1)
8264 #define SKIPFUNC (1 << 2)
8265 #define SKIPFILE (1 << 3)
8266 #define SKIPEVAL (1 << 4)
8267 static smallint evalskip; /* set to SKIPxxx if we are skipping commands */
8268 static int skipcount; /* number of levels to skip */
8269 static int funcnest; /* depth of function calls */
8270 static int loopnest; /* current loop nesting level */
8272 /* Forward decl way out to parsing code - dotrap needs it */
8273 static int evalstring(char *s, int mask);
8275 /* Called to execute a trap.
8276 * Single callsite - at the end of evaltree().
8277 * If we return non-zero, evaltree raises EXEXIT exception.
8279 * Perhaps we should avoid entering new trap handlers
8280 * while we are executing a trap handler. [is it a TODO?]
8289 savestatus = exitstatus;
8293 TRACE(("dotrap entered\n"));
8294 for (sig = 1, g = gotsig; sig < NSIG; sig++, g++) {
8301 /* non-trapped SIGINT is handled separately by raise_interrupt,
8302 * don't upset it by resetting gotsig[SIGINT-1] */
8303 if (sig == SIGINT && !t)
8306 TRACE(("sig %d is active, will run handler '%s'\n", sig, t));
8310 want_exexit = evalstring(t, SKIPEVAL);
8311 exitstatus = savestatus;
8313 TRACE(("dotrap returns %d\n", want_exexit));
8318 TRACE(("dotrap returns 0\n"));
8322 /* forward declarations - evaluation is fairly recursive business... */
8323 static void evalloop(union node *, int);
8324 static void evalfor(union node *, int);
8325 static void evalcase(union node *, int);
8326 static void evalsubshell(union node *, int);
8327 static void expredir(union node *);
8328 static void evalpipe(union node *, int);
8329 static void evalcommand(union node *, int);
8330 static int evalbltin(const struct builtincmd *, int, char **);
8331 static void prehash(union node *);
8334 * Evaluate a parse tree. The value is left in the global variable
8338 evaltree(union node *n, int flags)
8340 struct jmploc *volatile savehandler = exception_handler;
8341 struct jmploc jmploc;
8343 void (*evalfn)(union node *, int);
8347 SAVE_INT(int_level);
8350 TRACE(("evaltree(NULL) called\n"));
8353 TRACE(("evaltree(%p: %d, %d) called\n", n, n->type, flags));
8355 exception_handler = &jmploc;
8357 int err = setjmp(jmploc.loc);
8359 /* if it was a signal, check for trap handlers */
8360 if (exception_type == EXSIG) {
8361 TRACE(("exception %d (EXSIG) in evaltree, err=%d\n",
8362 exception_type, err));
8365 /* continue on the way out */
8366 TRACE(("exception %d in evaltree, propagating err=%d\n",
8367 exception_type, err));
8368 exception_handler = savehandler;
8369 longjmp(exception_handler->loc, err);
8376 out1fmt("Node type = %d\n", n->type);
8381 evaltree(n->nnot.com, EV_TESTED);
8382 status = !exitstatus;
8385 expredir(n->nredir.redirect);
8386 status = redirectsafe(n->nredir.redirect, REDIR_PUSH);
8388 evaltree(n->nredir.n, flags & EV_TESTED);
8389 status = exitstatus;
8391 popredir(/*drop:*/ 0, /*restore:*/ 0 /* not sure */);
8394 evalfn = evalcommand;
8396 if (eflag && !(flags & EV_TESTED))
8408 evalfn = evalsubshell;
8421 #error NAND + 1 != NOR
8423 #if NOR + 1 != NSEMI
8424 #error NOR + 1 != NSEMI
8426 unsigned is_or = n->type - NAND;
8429 (flags | ((is_or >> 1) - 1)) & EV_TESTED
8431 if (!exitstatus == is_or)
8444 evaltree(n->nif.test, EV_TESTED);
8447 if (exitstatus == 0) {
8451 if (n->nif.elsepart) {
8452 n = n->nif.elsepart;
8457 defun(n->narg.text, n->narg.next);
8461 exitstatus = status;
8466 exception_handler = savehandler;
8469 /* Order of checks below is important:
8470 * signal handlers trigger before exit caused by "set -e".
8472 if (pending_sig && dotrap())
8474 if (checkexit & exitstatus)
8475 evalskip |= SKIPEVAL;
8477 if (flags & EV_EXIT) {
8479 raise_exception(EXEXIT);
8482 RESTORE_INT(int_level);
8483 TRACE(("leaving evaltree (no interrupts)\n"));
8486 #if !defined(__alpha__) || (defined(__GNUC__) && __GNUC__ >= 3)
8489 void evaltreenr(union node *, int) __attribute__ ((alias("evaltree"),__noreturn__));
8492 evalloop(union node *n, int flags)
8502 evaltree(n->nbinary.ch1, EV_TESTED);
8505 if (evalskip == SKIPCONT && --skipcount <= 0) {
8509 if (evalskip == SKIPBREAK && --skipcount <= 0)
8514 if (n->type != NWHILE)
8518 evaltree(n->nbinary.ch2, flags);
8519 status = exitstatus;
8524 exitstatus = status;
8528 evalfor(union node *n, int flags)
8530 struct arglist arglist;
8533 struct stackmark smark;
8535 setstackmark(&smark);
8536 arglist.list = NULL;
8537 arglist.lastp = &arglist.list;
8538 for (argp = n->nfor.args; argp; argp = argp->narg.next) {
8539 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE | EXP_RECORD);
8544 *arglist.lastp = NULL;
8549 for (sp = arglist.list; sp; sp = sp->next) {
8550 setvar(n->nfor.var, sp->text, 0);
8551 evaltree(n->nfor.body, flags);
8553 if (evalskip == SKIPCONT && --skipcount <= 0) {
8557 if (evalskip == SKIPBREAK && --skipcount <= 0)
8564 popstackmark(&smark);
8568 evalcase(union node *n, int flags)
8572 struct arglist arglist;
8573 struct stackmark smark;
8575 setstackmark(&smark);
8576 arglist.list = NULL;
8577 arglist.lastp = &arglist.list;
8578 expandarg(n->ncase.expr, &arglist, EXP_TILDE);
8580 for (cp = n->ncase.cases; cp && evalskip == 0; cp = cp->nclist.next) {
8581 for (patp = cp->nclist.pattern; patp; patp = patp->narg.next) {
8582 if (casematch(patp, arglist.list->text)) {
8583 if (evalskip == 0) {
8584 evaltree(cp->nclist.body, flags);
8591 popstackmark(&smark);
8595 * Kick off a subshell to evaluate a tree.
8598 evalsubshell(union node *n, int flags)
8601 int backgnd = (n->type == NBACKGND);
8604 expredir(n->nredir.redirect);
8605 if (!backgnd && (flags & EV_EXIT) && !may_have_traps)
8608 jp = makejob(/*n,*/ 1);
8609 if (forkshell(jp, n, backgnd) == 0) {
8614 flags &= ~EV_TESTED;
8616 redirect(n->nredir.redirect, 0);
8617 evaltreenr(n->nredir.n, flags);
8622 status = waitforjob(jp);
8623 exitstatus = status;
8628 * Compute the names of the files in a redirection list.
8630 static void fixredir(union node *, const char *, int);
8632 expredir(union node *n)
8636 for (redir = n; redir; redir = redir->nfile.next) {
8640 fn.lastp = &fn.list;
8641 switch (redir->type) {
8645 #if ENABLE_ASH_BASH_COMPAT
8650 expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR);
8651 #if ENABLE_ASH_BASH_COMPAT
8654 redir->nfile.expfname = fn.list->text;
8657 case NTOFD: /* >& */
8658 if (redir->ndup.vname) {
8659 expandarg(redir->ndup.vname, &fn, EXP_FULL | EXP_TILDE);
8660 if (fn.list == NULL)
8661 ash_msg_and_raise_error("redir error");
8662 #if ENABLE_ASH_BASH_COMPAT
8663 //FIXME: we used expandarg with different args!
8664 if (!isdigit_str9(fn.list->text)) {
8665 /* >&file, not >&fd */
8666 if (redir->nfile.fd != 1) /* 123>&file - BAD */
8667 ash_msg_and_raise_error("redir error");
8669 goto store_expfname;
8672 fixredir(redir, fn.list->text, 1);
8680 * Evaluate a pipeline. All the processes in the pipeline are children
8681 * of the process creating the pipeline. (This differs from some versions
8682 * of the shell, which make the last process in a pipeline the parent
8686 evalpipe(union node *n, int flags)
8689 struct nodelist *lp;
8694 TRACE(("evalpipe(0x%lx) called\n", (long)n));
8696 for (lp = n->npipe.cmdlist; lp; lp = lp->next)
8700 jp = makejob(/*n,*/ pipelen);
8702 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
8706 if (pipe(pip) < 0) {
8708 ash_msg_and_raise_error("pipe call failed");
8711 if (forkshell(jp, lp->n, n->npipe.pipe_backgnd) == 0) {
8724 evaltreenr(lp->n, flags);
8730 /* Don't want to trigger debugging */
8734 if (n->npipe.pipe_backgnd == 0) {
8735 exitstatus = waitforjob(jp);
8736 TRACE(("evalpipe: job done exit status %d\n", exitstatus));
8742 * Controls whether the shell is interactive or not.
8745 setinteractive(int on)
8747 static smallint is_interactive;
8749 if (++on == is_interactive)
8751 is_interactive = on;
8755 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
8756 if (is_interactive > 1) {
8757 /* Looks like they want an interactive shell */
8758 static smallint did_banner;
8761 /* note: ash and hush share this string */
8762 out1fmt("\n\n%s %s\n"
8763 "Enter 'help' for a list of built-in commands."
8766 "built-in shell (ash)"
8780 setinteractive(iflag);
8782 #if ENABLE_FEATURE_EDITING_VI
8784 line_input_state->flags |= VI_MODE;
8786 line_input_state->flags &= ~VI_MODE;
8788 viflag = 0; /* forcibly keep the option off */
8792 static struct localvar *localvars;
8795 * Called after a function returns.
8796 * Interrupts must be off.
8801 struct localvar *lvp;
8804 while ((lvp = localvars) != NULL) {
8805 localvars = lvp->next;
8807 TRACE(("poplocalvar %s\n", vp ? vp->var_text : "-"));
8808 if (vp == NULL) { /* $- saved */
8809 memcpy(optlist, lvp->text, sizeof(optlist));
8810 free((char*)lvp->text);
8812 } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) {
8813 unsetvar(vp->var_text);
8816 vp->var_func(var_end(lvp->text));
8817 if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
8818 free((char*)vp->var_text);
8819 vp->flags = lvp->flags;
8820 vp->var_text = lvp->text;
8827 evalfun(struct funcnode *func, int argc, char **argv, int flags)
8829 volatile struct shparam saveparam;
8830 struct localvar *volatile savelocalvars;
8831 struct jmploc *volatile savehandler;
8832 struct jmploc jmploc;
8835 saveparam = shellparam;
8836 savelocalvars = localvars;
8837 e = setjmp(jmploc.loc);
8842 savehandler = exception_handler;
8843 exception_handler = &jmploc;
8845 shellparam.malloced = 0;
8849 shellparam.nparam = argc - 1;
8850 shellparam.p = argv + 1;
8851 #if ENABLE_ASH_GETOPTS
8852 shellparam.optind = 1;
8853 shellparam.optoff = -1;
8855 evaltree(&func->n, flags & EV_TESTED);
8861 localvars = savelocalvars;
8862 freeparam(&shellparam);
8863 shellparam = saveparam;
8864 exception_handler = savehandler;
8866 evalskip &= ~SKIPFUNC;
8870 #if ENABLE_ASH_CMDCMD
8872 parse_command_args(char **argv, const char **path)
8885 if (c == '-' && !*cp) {
8892 *path = bb_default_path;
8895 /* run 'typecmd' for other options */
8906 * Make a variable a local variable. When a variable is made local, it's
8907 * value and flags are saved in a localvar structure. The saved values
8908 * will be restored when the shell function returns. We handle the name
8909 * "-" as a special case.
8914 struct localvar *lvp;
8919 lvp = ckzalloc(sizeof(struct localvar));
8920 if (LONE_DASH(name)) {
8922 p = ckmalloc(sizeof(optlist));
8923 lvp->text = memcpy(p, optlist, sizeof(optlist));
8928 vpp = hashvar(name);
8929 vp = *findvar(vpp, name);
8930 eq = strchr(name, '=');
8933 setvareq(name, VSTRFIXED);
8935 setvar(name, NULL, VSTRFIXED);
8936 vp = *vpp; /* the new variable */
8937 lvp->flags = VUNSET;
8939 lvp->text = vp->var_text;
8940 lvp->flags = vp->flags;
8941 vp->flags |= VSTRFIXED|VTEXTFIXED;
8947 lvp->next = localvars;
8953 * The "local" command.
8955 static int FAST_FUNC
8956 localcmd(int argc UNUSED_PARAM, char **argv)
8961 while ((name = *argv++) != NULL) {
8967 static int FAST_FUNC
8968 falsecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
8973 static int FAST_FUNC
8974 truecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
8979 static int FAST_FUNC
8980 execcmd(int argc UNUSED_PARAM, char **argv)
8983 iflag = 0; /* exit on error */
8986 shellexec(argv + 1, pathval(), 0);
8992 * The return command.
8994 static int FAST_FUNC
8995 returncmd(int argc UNUSED_PARAM, char **argv)
8998 * If called outside a function, do what ksh does;
8999 * skip the rest of the file.
9001 evalskip = funcnest ? SKIPFUNC : SKIPFILE;
9002 return argv[1] ? number(argv[1]) : exitstatus;
9005 /* Forward declarations for builtintab[] */
9006 static int breakcmd(int, char **) FAST_FUNC;
9007 static int dotcmd(int, char **) FAST_FUNC;
9008 static int evalcmd(int, char **) FAST_FUNC;
9009 static int exitcmd(int, char **) FAST_FUNC;
9010 static int exportcmd(int, char **) FAST_FUNC;
9011 #if ENABLE_ASH_GETOPTS
9012 static int getoptscmd(int, char **) FAST_FUNC;
9014 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
9015 static int helpcmd(int, char **) FAST_FUNC;
9017 #if ENABLE_SH_MATH_SUPPORT
9018 static int letcmd(int, char **) FAST_FUNC;
9020 static int readcmd(int, char **) FAST_FUNC;
9021 static int setcmd(int, char **) FAST_FUNC;
9022 static int shiftcmd(int, char **) FAST_FUNC;
9023 static int timescmd(int, char **) FAST_FUNC;
9024 static int trapcmd(int, char **) FAST_FUNC;
9025 static int umaskcmd(int, char **) FAST_FUNC;
9026 static int unsetcmd(int, char **) FAST_FUNC;
9027 static int ulimitcmd(int, char **) FAST_FUNC;
9029 #define BUILTIN_NOSPEC "0"
9030 #define BUILTIN_SPECIAL "1"
9031 #define BUILTIN_REGULAR "2"
9032 #define BUILTIN_SPEC_REG "3"
9033 #define BUILTIN_ASSIGN "4"
9034 #define BUILTIN_SPEC_ASSG "5"
9035 #define BUILTIN_REG_ASSG "6"
9036 #define BUILTIN_SPEC_REG_ASSG "7"
9038 /* Stubs for calling non-FAST_FUNC's */
9039 #if ENABLE_ASH_BUILTIN_ECHO
9040 static int FAST_FUNC echocmd(int argc, char **argv) { return echo_main(argc, argv); }
9042 #if ENABLE_ASH_BUILTIN_PRINTF
9043 static int FAST_FUNC printfcmd(int argc, char **argv) { return printf_main(argc, argv); }
9045 #if ENABLE_ASH_BUILTIN_TEST
9046 static int FAST_FUNC testcmd(int argc, char **argv) { return test_main(argc, argv); }
9049 /* Keep these in proper order since it is searched via bsearch() */
9050 static const struct builtincmd builtintab[] = {
9051 { BUILTIN_SPEC_REG "." , dotcmd },
9052 { BUILTIN_SPEC_REG ":" , truecmd },
9053 #if ENABLE_ASH_BUILTIN_TEST
9054 { BUILTIN_REGULAR "[" , testcmd },
9055 #if ENABLE_ASH_BASH_COMPAT
9056 { BUILTIN_REGULAR "[[" , testcmd },
9059 #if ENABLE_ASH_ALIAS
9060 { BUILTIN_REG_ASSG "alias" , aliascmd },
9063 { BUILTIN_REGULAR "bg" , fg_bgcmd },
9065 { BUILTIN_SPEC_REG "break" , breakcmd },
9066 { BUILTIN_REGULAR "cd" , cdcmd },
9067 { BUILTIN_NOSPEC "chdir" , cdcmd },
9068 #if ENABLE_ASH_CMDCMD
9069 { BUILTIN_REGULAR "command" , commandcmd },
9071 { BUILTIN_SPEC_REG "continue", breakcmd },
9072 #if ENABLE_ASH_BUILTIN_ECHO
9073 { BUILTIN_REGULAR "echo" , echocmd },
9075 { BUILTIN_SPEC_REG "eval" , evalcmd },
9076 { BUILTIN_SPEC_REG "exec" , execcmd },
9077 { BUILTIN_SPEC_REG "exit" , exitcmd },
9078 { BUILTIN_SPEC_REG_ASSG "export" , exportcmd },
9079 { BUILTIN_REGULAR "false" , falsecmd },
9081 { BUILTIN_REGULAR "fg" , fg_bgcmd },
9083 #if ENABLE_ASH_GETOPTS
9084 { BUILTIN_REGULAR "getopts" , getoptscmd },
9086 { BUILTIN_NOSPEC "hash" , hashcmd },
9087 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
9088 { BUILTIN_NOSPEC "help" , helpcmd },
9091 { BUILTIN_REGULAR "jobs" , jobscmd },
9092 { BUILTIN_REGULAR "kill" , killcmd },
9094 #if ENABLE_SH_MATH_SUPPORT
9095 { BUILTIN_NOSPEC "let" , letcmd },
9097 { BUILTIN_ASSIGN "local" , localcmd },
9098 #if ENABLE_ASH_BUILTIN_PRINTF
9099 { BUILTIN_REGULAR "printf" , printfcmd },
9101 { BUILTIN_NOSPEC "pwd" , pwdcmd },
9102 { BUILTIN_REGULAR "read" , readcmd },
9103 { BUILTIN_SPEC_REG_ASSG "readonly", exportcmd },
9104 { BUILTIN_SPEC_REG "return" , returncmd },
9105 { BUILTIN_SPEC_REG "set" , setcmd },
9106 { BUILTIN_SPEC_REG "shift" , shiftcmd },
9107 #if ENABLE_ASH_BASH_COMPAT
9108 { BUILTIN_SPEC_REG "source" , dotcmd },
9110 #if ENABLE_ASH_BUILTIN_TEST
9111 { BUILTIN_REGULAR "test" , testcmd },
9113 { BUILTIN_SPEC_REG "times" , timescmd },
9114 { BUILTIN_SPEC_REG "trap" , trapcmd },
9115 { BUILTIN_REGULAR "true" , truecmd },
9116 { BUILTIN_NOSPEC "type" , typecmd },
9117 { BUILTIN_NOSPEC "ulimit" , ulimitcmd },
9118 { BUILTIN_REGULAR "umask" , umaskcmd },
9119 #if ENABLE_ASH_ALIAS
9120 { BUILTIN_REGULAR "unalias" , unaliascmd },
9122 { BUILTIN_SPEC_REG "unset" , unsetcmd },
9123 { BUILTIN_REGULAR "wait" , waitcmd },
9126 /* Should match the above table! */
9127 #define COMMANDCMD (builtintab + \
9129 1 * ENABLE_ASH_BUILTIN_TEST + \
9130 1 * ENABLE_ASH_BUILTIN_TEST * ENABLE_ASH_BASH_COMPAT + \
9131 1 * ENABLE_ASH_ALIAS + \
9132 1 * ENABLE_ASH_JOB_CONTROL + \
9134 #define EXECCMD (builtintab + \
9136 1 * ENABLE_ASH_BUILTIN_TEST + \
9137 1 * ENABLE_ASH_BUILTIN_TEST * ENABLE_ASH_BASH_COMPAT + \
9138 1 * ENABLE_ASH_ALIAS + \
9139 1 * ENABLE_ASH_JOB_CONTROL + \
9141 1 * ENABLE_ASH_CMDCMD + \
9143 ENABLE_ASH_BUILTIN_ECHO + \
9147 * Search the table of builtin commands.
9149 static struct builtincmd *
9150 find_builtin(const char *name)
9152 struct builtincmd *bp;
9155 name, builtintab, ARRAY_SIZE(builtintab), sizeof(builtintab[0]),
9162 * Execute a simple command.
9165 isassignment(const char *p)
9167 const char *q = endofname(p);
9172 static int FAST_FUNC
9173 bltincmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
9175 /* Preserve exitstatus of a previous possible redirection
9176 * as POSIX mandates */
9177 return back_exitstatus;
9180 evalcommand(union node *cmd, int flags)
9182 static const struct builtincmd null_bltin = {
9183 "\0\0", bltincmd /* why three NULs? */
9185 struct stackmark smark;
9187 struct arglist arglist;
9188 struct arglist varlist;
9191 const struct strlist *sp;
9192 struct cmdentry cmdentry;
9199 struct builtincmd *bcmd;
9200 smallint cmd_is_exec;
9201 smallint pseudovarflag = 0;
9203 /* First expand the arguments. */
9204 TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags));
9205 setstackmark(&smark);
9206 back_exitstatus = 0;
9208 cmdentry.cmdtype = CMDBUILTIN;
9209 cmdentry.u.cmd = &null_bltin;
9210 varlist.lastp = &varlist.list;
9211 *varlist.lastp = NULL;
9212 arglist.lastp = &arglist.list;
9213 *arglist.lastp = NULL;
9216 if (cmd->ncmd.args) {
9217 bcmd = find_builtin(cmd->ncmd.args->narg.text);
9218 pseudovarflag = bcmd && IS_BUILTIN_ASSIGN(bcmd);
9221 for (argp = cmd->ncmd.args; argp; argp = argp->narg.next) {
9222 struct strlist **spp;
9224 spp = arglist.lastp;
9225 if (pseudovarflag && isassignment(argp->narg.text))
9226 expandarg(argp, &arglist, EXP_VARTILDE);
9228 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
9230 for (sp = *spp; sp; sp = sp->next)
9234 argv = nargv = stalloc(sizeof(char *) * (argc + 1));
9235 for (sp = arglist.list; sp; sp = sp->next) {
9236 TRACE(("evalcommand arg: %s\n", sp->text));
9237 *nargv++ = sp->text;
9242 if (iflag && funcnest == 0 && argc > 0)
9243 lastarg = nargv[-1];
9246 expredir(cmd->ncmd.redirect);
9247 status = redirectsafe(cmd->ncmd.redirect, REDIR_PUSH | REDIR_SAVEFD2);
9249 path = vpath.var_text;
9250 for (argp = cmd->ncmd.assign; argp; argp = argp->narg.next) {
9251 struct strlist **spp;
9254 spp = varlist.lastp;
9255 expandarg(argp, &varlist, EXP_VARTILDE);
9258 * Modify the command lookup path, if a PATH= assignment
9262 if (varcmp(p, path) == 0)
9266 /* Print the command if xflag is set. */
9269 const char *p = " %s" + 1;
9271 fdprintf(preverrout_fd, p, expandstr(ps4val()));
9273 for (n = 0; n < 2; n++) {
9275 fdprintf(preverrout_fd, p, sp->text);
9281 safe_write(preverrout_fd, "\n", 1);
9287 /* Now locate the command. */
9289 const char *oldpath;
9290 int cmd_flag = DO_ERR;
9295 find_command(argv[0], &cmdentry, cmd_flag, path);
9296 if (cmdentry.cmdtype == CMDUNKNOWN) {
9297 flush_stdout_stderr();
9302 /* implement bltin and command here */
9303 if (cmdentry.cmdtype != CMDBUILTIN)
9306 spclbltin = IS_BUILTIN_SPECIAL(cmdentry.u.cmd);
9307 if (cmdentry.u.cmd == EXECCMD)
9309 #if ENABLE_ASH_CMDCMD
9310 if (cmdentry.u.cmd == COMMANDCMD) {
9312 nargv = parse_command_args(argv, &path);
9315 argc -= nargv - argv;
9317 cmd_flag |= DO_NOFUNC;
9325 /* We have a redirection error. */
9327 raise_exception(EXERROR);
9329 exitstatus = status;
9333 /* Execute the command. */
9334 switch (cmdentry.cmdtype) {
9337 #if ENABLE_FEATURE_SH_NOFORK
9338 /* (1) BUG: if variables are set, we need to fork, or save/restore them
9339 * around run_nofork_applet() call.
9340 * (2) Should this check also be done in forkshell()?
9341 * (perhaps it should, so that "VAR=VAL nofork" at least avoids exec...)
9343 /* find_command() encodes applet_no as (-2 - applet_no) */
9344 int applet_no = (- cmdentry.u.index - 2);
9345 if (applet_no >= 0 && APPLET_IS_NOFORK(applet_no)) {
9346 listsetvar(varlist.list, VEXPORT|VSTACK);
9347 /* run <applet>_main() */
9348 exitstatus = run_nofork_applet(applet_no, argv);
9352 /* Can we avoid forking off? For example, very last command
9353 * in a script or a subshell does not need forking,
9354 * we can just exec it.
9356 if (!(flags & EV_EXIT) || may_have_traps) {
9357 /* No, forking off a child is necessary */
9359 jp = makejob(/*cmd,*/ 1);
9360 if (forkshell(jp, cmd, FORK_FG) != 0) {
9362 exitstatus = waitforjob(jp);
9364 TRACE(("forked child exited with %d\n", exitstatus));
9369 /* fall through to exec'ing external program */
9371 listsetvar(varlist.list, VEXPORT|VSTACK);
9372 shellexec(argv, path, cmdentry.u.index);
9376 cmdenviron = varlist.list;
9378 struct strlist *list = cmdenviron;
9380 if (spclbltin > 0 || argc == 0) {
9382 if (cmd_is_exec && argc > 1)
9385 listsetvar(list, i);
9387 /* Tight loop with builtins only:
9388 * "while kill -0 $child; do true; done"
9389 * will never exit even if $child died, unless we do this
9390 * to reap the zombie and make kill detect that it's gone: */
9391 dowait(DOWAIT_NONBLOCK, NULL);
9393 if (evalbltin(cmdentry.u.cmd, argc, argv)) {
9395 int i = exception_type;
9400 exit_status = 128 + SIGINT;
9402 exit_status = 128 + pending_sig;
9403 exitstatus = exit_status;
9404 if (i == EXINT || spclbltin > 0) {
9406 longjmp(exception_handler->loc, 1);
9413 listsetvar(varlist.list, 0);
9414 /* See above for the rationale */
9415 dowait(DOWAIT_NONBLOCK, NULL);
9416 if (evalfun(cmdentry.u.func, argc, argv, flags))
9423 popredir(/*drop:*/ cmd_is_exec, /*restore:*/ cmd_is_exec);
9425 /* dsl: I think this is intended to be used to support
9426 * '_' in 'vi' command mode during line editing...
9427 * However I implemented that within libedit itself.
9429 setvar("_", lastarg, 0);
9431 popstackmark(&smark);
9435 evalbltin(const struct builtincmd *cmd, int argc, char **argv)
9437 char *volatile savecmdname;
9438 struct jmploc *volatile savehandler;
9439 struct jmploc jmploc;
9442 savecmdname = commandname;
9443 i = setjmp(jmploc.loc);
9446 savehandler = exception_handler;
9447 exception_handler = &jmploc;
9448 commandname = argv[0];
9450 optptr = NULL; /* initialize nextopt */
9451 exitstatus = (*cmd->builtin)(argc, argv);
9452 flush_stdout_stderr();
9454 exitstatus |= ferror(stdout);
9456 commandname = savecmdname;
9457 exception_handler = savehandler;
9463 goodname(const char *p)
9465 return endofname(p)[0] == '\0';
9470 * Search for a command. This is called before we fork so that the
9471 * location of the command will be available in the parent as well as
9472 * the child. The check for "goodname" is an overly conservative
9473 * check that the name will not be subject to expansion.
9476 prehash(union node *n)
9478 struct cmdentry entry;
9480 if (n->type == NCMD && n->ncmd.args && goodname(n->ncmd.args->narg.text))
9481 find_command(n->ncmd.args->narg.text, &entry, 0, pathval());
9485 /* ============ Builtin commands
9487 * Builtin commands whose functions are closely tied to evaluation
9488 * are implemented here.
9492 * Handle break and continue commands. Break, continue, and return are
9493 * all handled by setting the evalskip flag. The evaluation routines
9494 * above all check this flag, and if it is set they start skipping
9495 * commands rather than executing them. The variable skipcount is
9496 * the number of loops to break/continue, or the number of function
9497 * levels to return. (The latter is always 1.) It should probably
9498 * be an error to break out of more loops than exist, but it isn't
9499 * in the standard shell so we don't make it one here.
9501 static int FAST_FUNC
9502 breakcmd(int argc UNUSED_PARAM, char **argv)
9504 int n = argv[1] ? number(argv[1]) : 1;
9507 ash_msg_and_raise_error(msg_illnum, argv[1]);
9511 evalskip = (**argv == 'c') ? SKIPCONT : SKIPBREAK;
9518 /* ============ input.c
9520 * This implements the input routines used by the parser.
9524 INPUT_PUSH_FILE = 1,
9525 INPUT_NOFILE_OK = 2,
9528 static smallint checkkwd;
9529 /* values of checkkwd variable */
9530 #define CHKALIAS 0x1
9535 * Push a string back onto the input at this current parsefile level.
9536 * We handle aliases this way.
9538 #if !ENABLE_ASH_ALIAS
9539 #define pushstring(s, ap) pushstring(s)
9542 pushstring(char *s, struct alias *ap)
9549 if (g_parsefile->strpush) {
9550 sp = ckzalloc(sizeof(*sp));
9551 sp->prev = g_parsefile->strpush;
9553 sp = &(g_parsefile->basestrpush);
9555 g_parsefile->strpush = sp;
9556 sp->prev_string = g_parsefile->next_to_pgetc;
9557 sp->prev_left_in_line = g_parsefile->left_in_line;
9558 #if ENABLE_ASH_ALIAS
9561 ap->flag |= ALIASINUSE;
9565 g_parsefile->next_to_pgetc = s;
9566 g_parsefile->left_in_line = len;
9573 struct strpush *sp = g_parsefile->strpush;
9576 #if ENABLE_ASH_ALIAS
9578 if (g_parsefile->next_to_pgetc[-1] == ' '
9579 || g_parsefile->next_to_pgetc[-1] == '\t'
9581 checkkwd |= CHKALIAS;
9583 if (sp->string != sp->ap->val) {
9586 sp->ap->flag &= ~ALIASINUSE;
9587 if (sp->ap->flag & ALIASDEAD) {
9588 unalias(sp->ap->name);
9592 g_parsefile->next_to_pgetc = sp->prev_string;
9593 g_parsefile->left_in_line = sp->prev_left_in_line;
9594 g_parsefile->strpush = sp->prev;
9595 if (sp != &(g_parsefile->basestrpush))
9600 //FIXME: BASH_COMPAT with "...&" does TWO pungetc():
9601 //it peeks whether it is &>, and then pushes back both chars.
9602 //This function needs to save last *next_to_pgetc to buf[0]
9603 //to make two pungetc() reliable. Currently,
9604 // pgetc (out of buf: does preadfd), pgetc, pungetc, pungetc won't work...
9609 char *buf = g_parsefile->buf;
9611 g_parsefile->next_to_pgetc = buf;
9612 #if ENABLE_FEATURE_EDITING
9614 if (!iflag || g_parsefile->pf_fd != STDIN_FILENO)
9615 nr = nonblock_safe_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1);
9618 # if ENABLE_ASH_IDLE_TIMEOUT
9620 const char *tmout_var = lookupvar("TMOUT");
9622 timeout = atoi(tmout_var) * 1000;
9628 # if ENABLE_FEATURE_TAB_COMPLETION
9629 line_input_state->path_lookup = pathval();
9631 /* Unicode support should be activated even if LANG is set
9632 * _during_ shell execution, not only if it was set when
9633 * shell was started. Therefore, re-check LANG every time:
9635 reinit_unicode(lookupvar("LANG"));
9636 nr = read_line_input(line_input_state, cmdedit_prompt, buf, IBUFSIZ, timeout);
9638 /* Ctrl+C pressed */
9649 /* Ctrl+D pressed */
9652 # if ENABLE_ASH_IDLE_TIMEOUT
9653 else if (errno == EAGAIN && timeout > 0) {
9654 printf("\007timed out waiting for input: auto-logout\n");
9661 nr = nonblock_safe_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1);
9664 #if 0 /* disabled: nonblock_safe_read() handles this problem */
9666 if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
9667 int flags = fcntl(0, F_GETFL);
9668 if (flags >= 0 && (flags & O_NONBLOCK)) {
9669 flags &= ~O_NONBLOCK;
9670 if (fcntl(0, F_SETFL, flags) >= 0) {
9671 out2str("sh: turning off NDELAY mode\n");
9682 * Refill the input buffer and return the next input character:
9684 * 1) If a string was pushed back on the input, pop it;
9685 * 2) If an EOF was pushed back (g_parsefile->left_in_line < -BIGNUM)
9686 * or we are reading from a string so we can't refill the buffer,
9688 * 3) If there is more stuff in this buffer, use it else call read to fill it.
9689 * 4) Process input up to the next newline, deleting nul characters.
9691 //#define pgetc_debug(...) bb_error_msg(__VA_ARGS__)
9692 #define pgetc_debug(...) ((void)0)
9699 while (g_parsefile->strpush) {
9700 #if ENABLE_ASH_ALIAS
9701 if (g_parsefile->left_in_line == -1
9702 && g_parsefile->strpush->ap
9703 && g_parsefile->next_to_pgetc[-1] != ' '
9704 && g_parsefile->next_to_pgetc[-1] != '\t'
9706 pgetc_debug("preadbuffer PEOA");
9711 /* try "pgetc" now: */
9712 pgetc_debug("preadbuffer internal pgetc at %d:%p'%s'",
9713 g_parsefile->left_in_line,
9714 g_parsefile->next_to_pgetc,
9715 g_parsefile->next_to_pgetc);
9716 if (--g_parsefile->left_in_line >= 0)
9717 return (unsigned char)(*g_parsefile->next_to_pgetc++);
9719 /* on both branches above g_parsefile->left_in_line < 0.
9720 * "pgetc" needs refilling.
9723 /* -90 is our -BIGNUM. Below we use -99 to mark "EOF on read",
9724 * pungetc() may increment it a few times.
9725 * Assuming it won't increment it to less than -90.
9727 if (g_parsefile->left_in_line < -90 || g_parsefile->buf == NULL) {
9728 pgetc_debug("preadbuffer PEOF1");
9729 /* even in failure keep left_in_line and next_to_pgetc
9730 * in lock step, for correct multi-layer pungetc.
9731 * left_in_line was decremented before preadbuffer(),
9732 * must inc next_to_pgetc: */
9733 g_parsefile->next_to_pgetc++;
9737 more = g_parsefile->left_in_buffer;
9739 flush_stdout_stderr();
9743 /* don't try reading again */
9744 g_parsefile->left_in_line = -99;
9745 pgetc_debug("preadbuffer PEOF2");
9746 g_parsefile->next_to_pgetc++;
9751 /* Find out where's the end of line.
9752 * Set g_parsefile->left_in_line
9753 * and g_parsefile->left_in_buffer acordingly.
9754 * NUL chars are deleted.
9756 q = g_parsefile->next_to_pgetc;
9764 memmove(q, q + 1, more);
9768 g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1;
9774 g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1;
9775 if (g_parsefile->left_in_line < 0)
9780 g_parsefile->left_in_buffer = more;
9785 out2str(g_parsefile->next_to_pgetc);
9789 pgetc_debug("preadbuffer at %d:%p'%s'",
9790 g_parsefile->left_in_line,
9791 g_parsefile->next_to_pgetc,
9792 g_parsefile->next_to_pgetc);
9793 return (unsigned char)*g_parsefile->next_to_pgetc++;
9796 #define pgetc_as_macro() \
9797 (--g_parsefile->left_in_line >= 0 \
9798 ? (unsigned char)*g_parsefile->next_to_pgetc++ \
9805 pgetc_debug("pgetc_fast at %d:%p'%s'",
9806 g_parsefile->left_in_line,
9807 g_parsefile->next_to_pgetc,
9808 g_parsefile->next_to_pgetc);
9809 return pgetc_as_macro();
9812 #if ENABLE_ASH_OPTIMIZE_FOR_SIZE
9813 # define pgetc_fast() pgetc()
9815 # define pgetc_fast() pgetc_as_macro()
9818 #if ENABLE_ASH_ALIAS
9820 pgetc_without_PEOA(void)
9824 pgetc_debug("pgetc_fast at %d:%p'%s'",
9825 g_parsefile->left_in_line,
9826 g_parsefile->next_to_pgetc,
9827 g_parsefile->next_to_pgetc);
9829 } while (c == PEOA);
9833 # define pgetc_without_PEOA() pgetc()
9837 * Read a line from the script.
9840 pfgets(char *line, int len)
9846 while (--nleft > 0) {
9847 c = pgetc_without_PEOA();
9862 * Undo the last call to pgetc. Only one character may be pushed back.
9863 * PEOF may be pushed back.
9868 g_parsefile->left_in_line++;
9869 g_parsefile->next_to_pgetc--;
9870 pgetc_debug("pushed back to %d:%p'%s'",
9871 g_parsefile->left_in_line,
9872 g_parsefile->next_to_pgetc,
9873 g_parsefile->next_to_pgetc);
9877 * To handle the "." command, a stack of input files is used. Pushfile
9878 * adds a new entry to the stack and popfile restores the previous level.
9883 struct parsefile *pf;
9885 pf = ckzalloc(sizeof(*pf));
9886 pf->prev = g_parsefile;
9888 /*pf->strpush = NULL; - ckzalloc did it */
9889 /*pf->basestrpush.prev = NULL;*/
9896 struct parsefile *pf = g_parsefile;
9904 g_parsefile = pf->prev;
9910 * Return to top level.
9915 while (g_parsefile != &basepf)
9920 * Close the file(s) that the shell is reading commands from. Called
9921 * after a fork is done.
9927 if (g_parsefile->pf_fd > 0) {
9928 close(g_parsefile->pf_fd);
9929 g_parsefile->pf_fd = 0;
9934 * Like setinputfile, but takes an open file descriptor. Call this with
9938 setinputfd(int fd, int push)
9940 close_on_exec_on(fd);
9943 g_parsefile->buf = NULL;
9945 g_parsefile->pf_fd = fd;
9946 if (g_parsefile->buf == NULL)
9947 g_parsefile->buf = ckmalloc(IBUFSIZ);
9948 g_parsefile->left_in_buffer = 0;
9949 g_parsefile->left_in_line = 0;
9950 g_parsefile->linno = 1;
9954 * Set the input to take input from a file. If push is set, push the
9955 * old input onto the stack first.
9958 setinputfile(const char *fname, int flags)
9964 fd = open(fname, O_RDONLY);
9966 if (flags & INPUT_NOFILE_OK)
9968 ash_msg_and_raise_error("can't open '%s'", fname);
9971 fd2 = copyfd(fd, 10);
9974 ash_msg_and_raise_error("out of file descriptors");
9977 setinputfd(fd, flags & INPUT_PUSH_FILE);
9984 * Like setinputfile, but takes input from a string.
9987 setinputstring(char *string)
9991 g_parsefile->next_to_pgetc = string;
9992 g_parsefile->left_in_line = strlen(string);
9993 g_parsefile->buf = NULL;
9994 g_parsefile->linno = 1;
9999 /* ============ mail.c
10001 * Routines to check for mail.
10004 #if ENABLE_ASH_MAIL
10006 #define MAXMBOXES 10
10008 /* times of mailboxes */
10009 static time_t mailtime[MAXMBOXES];
10010 /* Set if MAIL or MAILPATH is changed. */
10011 static smallint mail_var_path_changed;
10014 * Print appropriate message(s) if mail has arrived.
10015 * If mail_var_path_changed is set,
10016 * then the value of MAIL has mail_var_path_changed,
10017 * so we just update the values.
10026 struct stackmark smark;
10029 setstackmark(&smark);
10030 mpath = mpathset() ? mpathval() : mailval();
10031 for (mtp = mailtime; mtp < mailtime + MAXMBOXES; mtp++) {
10032 p = path_advance(&mpath, nullstr);
10037 for (q = p; *q; q++)
10043 q[-1] = '\0'; /* delete trailing '/' */
10044 if (stat(p, &statb) < 0) {
10048 if (!mail_var_path_changed && statb.st_mtime != *mtp) {
10051 pathopt ? pathopt : "you have mail"
10054 *mtp = statb.st_mtime;
10056 mail_var_path_changed = 0;
10057 popstackmark(&smark);
10060 static void FAST_FUNC
10061 changemail(const char *val UNUSED_PARAM)
10063 mail_var_path_changed = 1;
10066 #endif /* ASH_MAIL */
10069 /* ============ ??? */
10072 * Set the shell parameters.
10075 setparam(char **argv)
10081 for (nparam = 0; argv[nparam]; nparam++)
10083 ap = newparam = ckmalloc((nparam + 1) * sizeof(*ap));
10085 *ap++ = ckstrdup(*argv++);
10088 freeparam(&shellparam);
10089 shellparam.malloced = 1;
10090 shellparam.nparam = nparam;
10091 shellparam.p = newparam;
10092 #if ENABLE_ASH_GETOPTS
10093 shellparam.optind = 1;
10094 shellparam.optoff = -1;
10099 * Process shell options. The global variable argptr contains a pointer
10100 * to the argument list; we advance it past the options.
10102 * SUSv3 section 2.8.1 "Consequences of Shell Errors" says:
10103 * For a non-interactive shell, an error condition encountered
10104 * by a special built-in ... shall cause the shell to write a diagnostic message
10105 * to standard error and exit as shown in the following table:
10106 * Error Special Built-In
10108 * Utility syntax error (option or operand error) Shall exit
10110 * However, in bug 1142 (http://busybox.net/bugs/view.php?id=1142)
10111 * we see that bash does not do that (set "finishes" with error code 1 instead,
10112 * and shell continues), and people rely on this behavior!
10114 * set -o barfoo 2>/dev/null
10117 * Oh well. Let's mimic that.
10120 plus_minus_o(char *name, int val)
10125 for (i = 0; i < NOPTS; i++) {
10126 if (strcmp(name, optnames(i)) == 0) {
10131 ash_msg("illegal option %co %s", val ? '-' : '+', name);
10134 for (i = 0; i < NOPTS; i++) {
10136 out1fmt("%-16s%s\n", optnames(i), optlist[i] ? "on" : "off");
10138 out1fmt("set %co %s\n", optlist[i] ? '-' : '+', optnames(i));
10144 setoption(int flag, int val)
10148 for (i = 0; i < NOPTS; i++) {
10149 if (optletters(i) == flag) {
10154 ash_msg_and_raise_error("illegal option %c%c", val ? '-' : '+', flag);
10158 options(int cmdline)
10166 while ((p = *argptr) != NULL) {
10168 if (c != '-' && c != '+')
10171 val = 0; /* val = 0 if c == '+' */
10174 if (p[0] == '\0' || LONE_DASH(p)) {
10176 /* "-" means turn off -x and -v */
10179 /* "--" means reset params */
10180 else if (*argptr == NULL)
10183 break; /* "-" or "--" terminates options */
10186 /* first char was + or - */
10187 while ((c = *p++) != '\0') {
10188 /* bash 3.2 indeed handles -c CMD and +c CMD the same */
10189 if (c == 'c' && cmdline) {
10190 minusc = p; /* command is after shell args */
10191 } else if (c == 'o') {
10192 if (plus_minus_o(*argptr, val)) {
10193 /* it already printed err message */
10194 return 1; /* error */
10198 } else if (cmdline && (c == 'l')) { /* -l or +l == --login */
10200 /* bash does not accept +-login, we also won't */
10201 } else if (cmdline && val && (c == '-')) { /* long options */
10202 if (strcmp(p, "login") == 0)
10214 * The shift builtin command.
10216 static int FAST_FUNC
10217 shiftcmd(int argc UNUSED_PARAM, char **argv)
10224 n = number(argv[1]);
10225 if (n > shellparam.nparam)
10226 n = 0; /* bash compat, was = shellparam.nparam; */
10228 shellparam.nparam -= n;
10229 for (ap1 = shellparam.p; --n >= 0; ap1++) {
10230 if (shellparam.malloced)
10233 ap2 = shellparam.p;
10234 while ((*ap2++ = *ap1++) != NULL)
10236 #if ENABLE_ASH_GETOPTS
10237 shellparam.optind = 1;
10238 shellparam.optoff = -1;
10245 * POSIX requires that 'set' (but not export or readonly) output the
10246 * variables in lexicographic order - by the locale's collating order (sigh).
10247 * Maybe we could keep them in an ordered balanced binary tree
10248 * instead of hashed lists.
10249 * For now just roll 'em through qsort for printing...
10252 showvars(const char *sep_prefix, int on, int off)
10255 char **ep, **epend;
10257 ep = listvars(on, off, &epend);
10258 qsort(ep, epend - ep, sizeof(char *), vpcmp);
10260 sep = *sep_prefix ? " " : sep_prefix;
10262 for (; ep < epend; ep++) {
10266 p = strchrnul(*ep, '=');
10269 q = single_quote(++p);
10270 out1fmt("%s%s%.*s%s\n", sep_prefix, sep, (int)(p - *ep), *ep, q);
10276 * The set command builtin.
10278 static int FAST_FUNC
10279 setcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
10284 return showvars(nullstr, 0, VUNSET);
10287 retval = options(/*cmdline:*/ 0);
10288 if (retval == 0) { /* if no parse error... */
10290 if (*argptr != NULL) {
10298 #if ENABLE_ASH_RANDOM_SUPPORT
10299 static void FAST_FUNC
10300 change_random(const char *value)
10304 if (value == NULL) {
10305 /* "get", generate */
10306 t = next_random(&random_gen);
10307 /* set without recursion */
10308 setvar(vrandom.var_text, utoa(t), VNOFUNC);
10309 vrandom.flags &= ~VNOFUNC;
10312 t = strtoul(value, NULL, 10);
10313 INIT_RANDOM_T(&random_gen, (t ? t : 1), t);
10318 #if ENABLE_ASH_GETOPTS
10320 getopts(char *optstr, char *optvar, char **optfirst, int *param_optind, int *optoff)
10329 if (*param_optind < 1)
10331 optnext = optfirst + *param_optind - 1;
10333 if (*param_optind <= 1 || *optoff < 0 || (int)strlen(optnext[-1]) < *optoff)
10336 p = optnext[-1] + *optoff;
10337 if (p == NULL || *p == '\0') {
10338 /* Current word is done, advance */
10340 if (p == NULL || *p != '-' || *++p == '\0') {
10347 if (LONE_DASH(p)) /* check for "--" */
10352 for (q = optstr; *q != c;) {
10354 if (optstr[0] == ':') {
10357 err |= setvarsafe("OPTARG", s, 0);
10359 fprintf(stderr, "Illegal option -%c\n", c);
10360 unsetvar("OPTARG");
10370 if (*p == '\0' && (p = *optnext) == NULL) {
10371 if (optstr[0] == ':') {
10374 err |= setvarsafe("OPTARG", s, 0);
10377 fprintf(stderr, "No arg for -%c option\n", c);
10378 unsetvar("OPTARG");
10386 err |= setvarsafe("OPTARG", p, 0);
10389 err |= setvarsafe("OPTARG", nullstr, 0);
10391 *optoff = p ? p - *(optnext - 1) : -1;
10392 *param_optind = optnext - optfirst + 1;
10393 fmtstr(s, sizeof(s), "%d", *param_optind);
10394 err |= setvarsafe("OPTIND", s, VNOFUNC);
10397 err |= setvarsafe(optvar, s, 0);
10401 flush_stdout_stderr();
10402 raise_exception(EXERROR);
10408 * The getopts builtin. Shellparam.optnext points to the next argument
10409 * to be processed. Shellparam.optptr points to the next character to
10410 * be processed in the current argument. If shellparam.optnext is NULL,
10411 * then it's the first time getopts has been called.
10413 static int FAST_FUNC
10414 getoptscmd(int argc, char **argv)
10419 ash_msg_and_raise_error("usage: getopts optstring var [arg]");
10421 optbase = shellparam.p;
10422 if (shellparam.optind > shellparam.nparam + 1) {
10423 shellparam.optind = 1;
10424 shellparam.optoff = -1;
10427 optbase = &argv[3];
10428 if (shellparam.optind > argc - 2) {
10429 shellparam.optind = 1;
10430 shellparam.optoff = -1;
10434 return getopts(argv[1], argv[2], optbase, &shellparam.optind,
10435 &shellparam.optoff);
10437 #endif /* ASH_GETOPTS */
10440 /* ============ Shell parser */
10443 struct heredoc *next; /* next here document in list */
10444 union node *here; /* redirection node */
10445 char *eofmark; /* string indicating end of input */
10446 smallint striptabs; /* if set, strip leading tabs */
10449 static smallint tokpushback; /* last token pushed back */
10450 static smallint parsebackquote; /* nonzero if we are inside backquotes */
10451 static smallint quoteflag; /* set if (part of) last token was quoted */
10452 static token_id_t lasttoken; /* last token read (integer id Txxx) */
10453 static struct heredoc *heredoclist; /* list of here documents to read */
10454 static char *wordtext; /* text of last word returned by readtoken */
10455 static struct nodelist *backquotelist;
10456 static union node *redirnode;
10457 static struct heredoc *heredoc;
10459 static const char *
10460 tokname(char *buf, int tok)
10463 return tokname_array[tok] + 1;
10464 sprintf(buf, "\"%s\"", tokname_array[tok] + 1);
10468 /* raise_error_unexpected_syntax:
10469 * Called when an unexpected token is read during the parse. The argument
10470 * is the token that is expected, or -1 if more than one type of token can
10471 * occur at this point.
10473 static void raise_error_unexpected_syntax(int) NORETURN;
10475 raise_error_unexpected_syntax(int token)
10481 l = sprintf(msg, "unexpected %s", tokname(buf, lasttoken));
10483 sprintf(msg + l, " (expecting %s)", tokname(buf, token));
10484 raise_error_syntax(msg);
10488 #define EOFMARKLEN 79
10490 /* parsing is heavily cross-recursive, need these forward decls */
10491 static union node *andor(void);
10492 static union node *pipeline(void);
10493 static union node *parse_command(void);
10494 static void parseheredoc(void);
10495 static char peektoken(void);
10496 static int readtoken(void);
10498 static union node *
10501 union node *n1, *n2, *n3;
10504 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10505 if (nlflag == 2 && peektoken())
10511 if (tok == TBACKGND) {
10512 if (n2->type == NPIPE) {
10513 n2->npipe.pipe_backgnd = 1;
10515 if (n2->type != NREDIR) {
10516 n3 = stzalloc(sizeof(struct nredir));
10518 /*n3->nredir.redirect = NULL; - stzalloc did it */
10521 n2->type = NBACKGND;
10527 n3 = stzalloc(sizeof(struct nbinary));
10529 n3->nbinary.ch1 = n1;
10530 n3->nbinary.ch2 = n2;
10546 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10554 pungetc(); /* push back EOF on input */
10558 raise_error_unexpected_syntax(-1);
10565 static union node *
10568 union node *n1, *n2, *n3;
10576 } else if (t == TOR) {
10582 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10584 n3 = stzalloc(sizeof(struct nbinary));
10586 n3->nbinary.ch1 = n1;
10587 n3->nbinary.ch2 = n2;
10592 static union node *
10595 union node *n1, *n2, *pipenode;
10596 struct nodelist *lp, *prev;
10600 TRACE(("pipeline: entered\n"));
10601 if (readtoken() == TNOT) {
10603 checkkwd = CHKKWD | CHKALIAS;
10606 n1 = parse_command();
10607 if (readtoken() == TPIPE) {
10608 pipenode = stzalloc(sizeof(struct npipe));
10609 pipenode->type = NPIPE;
10610 /*pipenode->npipe.pipe_backgnd = 0; - stzalloc did it */
10611 lp = stzalloc(sizeof(struct nodelist));
10612 pipenode->npipe.cmdlist = lp;
10616 lp = stzalloc(sizeof(struct nodelist));
10617 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10618 lp->n = parse_command();
10620 } while (readtoken() == TPIPE);
10626 n2 = stzalloc(sizeof(struct nnot));
10634 static union node *
10639 n = stzalloc(sizeof(struct narg));
10641 /*n->narg.next = NULL; - stzalloc did it */
10642 n->narg.text = wordtext;
10643 n->narg.backquote = backquotelist;
10648 fixredir(union node *n, const char *text, int err)
10652 TRACE(("Fix redir %s %d\n", text, err));
10654 n->ndup.vname = NULL;
10656 fd = bb_strtou(text, NULL, 10);
10657 if (!errno && fd >= 0)
10658 n->ndup.dupfd = fd;
10659 else if (LONE_DASH(text))
10660 n->ndup.dupfd = -1;
10663 raise_error_syntax("bad fd number");
10664 n->ndup.vname = makename();
10669 * Returns true if the text contains nothing to expand (no dollar signs
10673 noexpand(const char *text)
10677 while ((c = *text++) != '\0') {
10678 if (c == CTLQUOTEMARK)
10682 else if (SIT(c, BASESYNTAX) == CCTL)
10691 union node *n = redirnode;
10693 if (readtoken() != TWORD)
10694 raise_error_unexpected_syntax(-1);
10695 if (n->type == NHERE) {
10696 struct heredoc *here = heredoc;
10700 if (quoteflag == 0)
10702 TRACE(("Here document %d\n", n->type));
10703 if (!noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN)
10704 raise_error_syntax("illegal eof marker for << redirection");
10705 rmescapes(wordtext, 0);
10706 here->eofmark = wordtext;
10708 if (heredoclist == NULL)
10709 heredoclist = here;
10711 for (p = heredoclist; p->next; p = p->next)
10715 } else if (n->type == NTOFD || n->type == NFROMFD) {
10716 fixredir(n, wordtext, 0);
10718 n->nfile.fname = makename();
10722 static union node *
10725 union node *args, **app;
10726 union node *n = NULL;
10727 union node *vars, **vpp;
10728 union node **rpp, *redir;
10730 #if ENABLE_ASH_BASH_COMPAT
10731 smallint double_brackets_flag = 0;
10741 savecheckkwd = CHKALIAS;
10744 checkkwd = savecheckkwd;
10747 #if ENABLE_ASH_BASH_COMPAT
10748 case TAND: /* "&&" */
10749 case TOR: /* "||" */
10750 if (!double_brackets_flag) {
10754 wordtext = (char *) (t == TAND ? "-a" : "-o");
10757 n = stzalloc(sizeof(struct narg));
10759 /*n->narg.next = NULL; - stzalloc did it */
10760 n->narg.text = wordtext;
10761 #if ENABLE_ASH_BASH_COMPAT
10762 if (strcmp("[[", wordtext) == 0)
10763 double_brackets_flag = 1;
10764 else if (strcmp("]]", wordtext) == 0)
10765 double_brackets_flag = 0;
10767 n->narg.backquote = backquotelist;
10768 if (savecheckkwd && isassignment(wordtext)) {
10770 vpp = &n->narg.next;
10773 app = &n->narg.next;
10778 *rpp = n = redirnode;
10779 rpp = &n->nfile.next;
10780 parsefname(); /* read name of redirection file */
10783 if (args && app == &args->narg.next
10786 struct builtincmd *bcmd;
10789 /* We have a function */
10790 if (readtoken() != TRP)
10791 raise_error_unexpected_syntax(TRP);
10792 name = n->narg.text;
10793 if (!goodname(name)
10794 || ((bcmd = find_builtin(name)) && IS_BUILTIN_SPECIAL(bcmd))
10796 raise_error_syntax("bad function name");
10799 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10800 n->narg.next = parse_command();
10813 n = stzalloc(sizeof(struct ncmd));
10815 n->ncmd.args = args;
10816 n->ncmd.assign = vars;
10817 n->ncmd.redirect = redir;
10821 static union node *
10822 parse_command(void)
10824 union node *n1, *n2;
10825 union node *ap, **app;
10826 union node *cp, **cpp;
10827 union node *redir, **rpp;
10834 switch (readtoken()) {
10836 raise_error_unexpected_syntax(-1);
10839 n1 = stzalloc(sizeof(struct nif));
10841 n1->nif.test = list(0);
10842 if (readtoken() != TTHEN)
10843 raise_error_unexpected_syntax(TTHEN);
10844 n1->nif.ifpart = list(0);
10846 while (readtoken() == TELIF) {
10847 n2->nif.elsepart = stzalloc(sizeof(struct nif));
10848 n2 = n2->nif.elsepart;
10850 n2->nif.test = list(0);
10851 if (readtoken() != TTHEN)
10852 raise_error_unexpected_syntax(TTHEN);
10853 n2->nif.ifpart = list(0);
10855 if (lasttoken == TELSE)
10856 n2->nif.elsepart = list(0);
10858 n2->nif.elsepart = NULL;
10866 n1 = stzalloc(sizeof(struct nbinary));
10867 n1->type = (lasttoken == TWHILE) ? NWHILE : NUNTIL;
10868 n1->nbinary.ch1 = list(0);
10871 TRACE(("expecting DO got '%s' %s\n", tokname_array[got] + 1,
10872 got == TWORD ? wordtext : ""));
10873 raise_error_unexpected_syntax(TDO);
10875 n1->nbinary.ch2 = list(0);
10880 if (readtoken() != TWORD || quoteflag || !goodname(wordtext))
10881 raise_error_syntax("bad for loop variable");
10882 n1 = stzalloc(sizeof(struct nfor));
10884 n1->nfor.var = wordtext;
10885 checkkwd = CHKKWD | CHKALIAS;
10886 if (readtoken() == TIN) {
10888 while (readtoken() == TWORD) {
10889 n2 = stzalloc(sizeof(struct narg));
10891 /*n2->narg.next = NULL; - stzalloc did it */
10892 n2->narg.text = wordtext;
10893 n2->narg.backquote = backquotelist;
10895 app = &n2->narg.next;
10898 n1->nfor.args = ap;
10899 if (lasttoken != TNL && lasttoken != TSEMI)
10900 raise_error_unexpected_syntax(-1);
10902 n2 = stzalloc(sizeof(struct narg));
10904 /*n2->narg.next = NULL; - stzalloc did it */
10905 n2->narg.text = (char *)dolatstr;
10906 /*n2->narg.backquote = NULL;*/
10907 n1->nfor.args = n2;
10909 * Newline or semicolon here is optional (but note
10910 * that the original Bourne shell only allowed NL).
10912 if (lasttoken != TNL && lasttoken != TSEMI)
10915 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10916 if (readtoken() != TDO)
10917 raise_error_unexpected_syntax(TDO);
10918 n1->nfor.body = list(0);
10922 n1 = stzalloc(sizeof(struct ncase));
10924 if (readtoken() != TWORD)
10925 raise_error_unexpected_syntax(TWORD);
10926 n1->ncase.expr = n2 = stzalloc(sizeof(struct narg));
10928 /*n2->narg.next = NULL; - stzalloc did it */
10929 n2->narg.text = wordtext;
10930 n2->narg.backquote = backquotelist;
10932 checkkwd = CHKKWD | CHKALIAS;
10933 } while (readtoken() == TNL);
10934 if (lasttoken != TIN)
10935 raise_error_unexpected_syntax(TIN);
10936 cpp = &n1->ncase.cases;
10938 checkkwd = CHKNL | CHKKWD;
10940 while (t != TESAC) {
10941 if (lasttoken == TLP)
10943 *cpp = cp = stzalloc(sizeof(struct nclist));
10945 app = &cp->nclist.pattern;
10947 *app = ap = stzalloc(sizeof(struct narg));
10949 /*ap->narg.next = NULL; - stzalloc did it */
10950 ap->narg.text = wordtext;
10951 ap->narg.backquote = backquotelist;
10952 if (readtoken() != TPIPE)
10954 app = &ap->narg.next;
10957 //ap->narg.next = NULL;
10958 if (lasttoken != TRP)
10959 raise_error_unexpected_syntax(TRP);
10960 cp->nclist.body = list(2);
10962 cpp = &cp->nclist.next;
10964 checkkwd = CHKNL | CHKKWD;
10968 raise_error_unexpected_syntax(TENDCASE);
10975 n1 = stzalloc(sizeof(struct nredir));
10976 n1->type = NSUBSHELL;
10977 n1->nredir.n = list(0);
10978 /*n1->nredir.redirect = NULL; - stzalloc did it */
10988 return simplecmd();
10991 if (readtoken() != t)
10992 raise_error_unexpected_syntax(t);
10995 /* Now check for redirection which may follow command */
10996 checkkwd = CHKKWD | CHKALIAS;
10998 while (readtoken() == TREDIR) {
10999 *rpp = n2 = redirnode;
11000 rpp = &n2->nfile.next;
11006 if (n1->type != NSUBSHELL) {
11007 n2 = stzalloc(sizeof(struct nredir));
11012 n1->nredir.redirect = redir;
11017 #if ENABLE_ASH_BASH_COMPAT
11018 static int decode_dollar_squote(void)
11020 static const char C_escapes[] ALIGN1 = "nrbtfav""x\\01234567";
11026 p = strchr(C_escapes, c);
11031 if ((unsigned char)(c - '0') <= 7) { /* \ooo */
11035 } while ((unsigned char)(c - '0') <= 7 && --cnt);
11037 } else if (c == 'x') { /* \xHH */
11041 } while (isxdigit(c) && --cnt);
11043 if (cnt == 3) { /* \x but next char is "bad" */
11047 } else { /* simple seq like \\ or \t */
11052 c = bb_process_escape_sequence((void*)&p);
11053 } else { /* unrecognized "\z": print both chars unless ' or " */
11054 if (c != '\'' && c != '"') {
11056 c |= 0x100; /* "please encode \, then me" */
11064 * If eofmark is NULL, read a word or a redirection symbol. If eofmark
11065 * is not NULL, read a here document. In the latter case, eofmark is the
11066 * word which marks the end of the document and striptabs is true if
11067 * leading tabs should be stripped from the document. The argument c
11068 * is the first character of the input token or document.
11070 * Because C does not have internal subroutines, I have simulated them
11071 * using goto's to implement the subroutine linkage. The following macros
11072 * will run code that appears at the end of readtoken1.
11074 #define CHECKEND() {goto checkend; checkend_return:;}
11075 #define PARSEREDIR() {goto parseredir; parseredir_return:;}
11076 #define PARSESUB() {goto parsesub; parsesub_return:;}
11077 #define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;}
11078 #define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;}
11079 #define PARSEARITH() {goto parsearith; parsearith_return:;}
11081 readtoken1(int c, int syntax, char *eofmark, int striptabs)
11083 /* NB: syntax parameter fits into smallint */
11084 /* c parameter is an unsigned char or PEOF or PEOA */
11087 char line[EOFMARKLEN + 1];
11088 struct nodelist *bqlist;
11092 smallint prevsyntax; /* syntax before arithmetic */
11093 #if ENABLE_ASH_EXPAND_PRMT
11094 smallint pssyntax; /* we are expanding a prompt string */
11096 int varnest; /* levels of variables expansion */
11097 int arinest; /* levels of arithmetic expansion */
11098 int parenlevel; /* levels of parens in arithmetic */
11099 int dqvarnest; /* levels of variables expansion within double quotes */
11101 IF_ASH_BASH_COMPAT(smallint bash_dollar_squote = 0;)
11104 /* Avoid longjmp clobbering */
11110 (void) &parenlevel;
11113 (void) &prevsyntax;
11116 startlinno = g_parsefile->linno;
11120 #if ENABLE_ASH_EXPAND_PRMT
11121 pssyntax = (syntax == PSSYNTAX);
11125 dblquote = (syntax == DQSYNTAX);
11131 STARTSTACKSTR(out);
11133 /* For each line, until end of word */
11134 CHECKEND(); /* set c to PEOF if at end of here document */
11135 for (;;) { /* until end of line or end of word */
11136 CHECKSTRSPACE(4, out); /* permit 4 calls to USTPUTC */
11137 switch (SIT(c, syntax)) {
11138 case CNL: /* '\n' */
11139 if (syntax == BASESYNTAX)
11140 goto endword; /* exit outer loop */
11142 g_parsefile->linno++;
11143 setprompt_if(doprompt, 2);
11145 goto loop; /* continue outer loop */
11150 if (eofmark == NULL || dblquote)
11151 USTPUTC(CTLESC, out);
11152 #if ENABLE_ASH_BASH_COMPAT
11153 if (c == '\\' && bash_dollar_squote) {
11154 c = decode_dollar_squote();
11156 USTPUTC('\\', out);
11157 c = (unsigned char)c;
11163 case CBACK: /* backslash */
11164 c = pgetc_without_PEOA();
11166 USTPUTC(CTLESC, out);
11167 USTPUTC('\\', out);
11169 } else if (c == '\n') {
11170 setprompt_if(doprompt, 2);
11172 #if ENABLE_ASH_EXPAND_PRMT
11173 if (c == '$' && pssyntax) {
11174 USTPUTC(CTLESC, out);
11175 USTPUTC('\\', out);
11178 /* Backslash is retained if we are in "str" and next char isn't special */
11183 && (c != '"' || eofmark != NULL)
11185 USTPUTC(CTLESC, out);
11186 USTPUTC('\\', out);
11188 if (SIT(c, SQSYNTAX) == CCTL)
11189 USTPUTC(CTLESC, out);
11197 if (eofmark == NULL) {
11198 USTPUTC(CTLQUOTEMARK, out);
11206 IF_ASH_BASH_COMPAT(bash_dollar_squote = 0;)
11207 if (eofmark != NULL && arinest == 0
11212 if (dqvarnest == 0) {
11213 syntax = BASESYNTAX;
11220 case CVAR: /* '$' */
11221 PARSESUB(); /* parse substitution */
11223 case CENDVAR: /* '}' */
11226 if (dqvarnest > 0) {
11233 #if ENABLE_SH_MATH_SUPPORT
11234 case CLP: /* '(' in arithmetic */
11238 case CRP: /* ')' in arithmetic */
11239 if (parenlevel > 0) {
11242 if (pgetc() == ')') {
11243 if (--arinest == 0) {
11244 syntax = prevsyntax;
11245 dblquote = (syntax == DQSYNTAX);
11250 * unbalanced parens
11251 * (don't 2nd guess - no error)
11259 case CBQUOTE: /* '`' */
11263 goto endword; /* exit outer loop */
11267 if (varnest == 0) {
11268 #if ENABLE_ASH_BASH_COMPAT
11270 if (pgetc() == '>')
11271 c = 0x100 + '>'; /* flag &> */
11275 goto endword; /* exit outer loop */
11277 IF_ASH_ALIAS(if (c != PEOA))
11284 #if ENABLE_SH_MATH_SUPPORT
11285 if (syntax == ARISYNTAX)
11286 raise_error_syntax("missing '))'");
11288 if (syntax != BASESYNTAX && !parsebackquote && eofmark == NULL)
11289 raise_error_syntax("unterminated quoted string");
11290 if (varnest != 0) {
11291 startlinno = g_parsefile->linno;
11293 raise_error_syntax("missing '}'");
11295 USTPUTC('\0', out);
11296 len = out - (char *)stackblock();
11297 out = stackblock();
11298 if (eofmark == NULL) {
11299 if ((c == '>' || c == '<' IF_ASH_BASH_COMPAT( || c == 0x100 + '>'))
11302 if (isdigit_str9(out)) {
11303 PARSEREDIR(); /* passed as params: out, c */
11304 lasttoken = TREDIR;
11307 /* else: non-number X seen, interpret it
11308 * as "NNNX>file" = "NNNX >file" */
11312 quoteflag = quotef;
11313 backquotelist = bqlist;
11314 grabstackblock(len);
11318 /* end of readtoken routine */
11321 * Check to see whether we are at the end of the here document. When this
11322 * is called, c is set to the first character of the next input line. If
11323 * we are at the end of the here document, this routine sets the c to PEOF.
11327 #if ENABLE_ASH_ALIAS
11329 c = pgetc_without_PEOA();
11332 while (c == '\t') {
11333 c = pgetc_without_PEOA();
11336 if (c == *eofmark) {
11337 if (pfgets(line, sizeof(line)) != NULL) {
11341 for (q = eofmark + 1; *q && *p == *q; p++, q++)
11343 if (*p == '\n' && *q == '\0') {
11345 g_parsefile->linno++;
11346 needprompt = doprompt;
11348 pushstring(line, NULL);
11353 goto checkend_return;
11357 * Parse a redirection operator. The variable "out" points to a string
11358 * specifying the fd to be redirected. The variable "c" contains the
11359 * first character of the redirection operator.
11362 /* out is already checked to be a valid number or "" */
11363 int fd = (*out == '\0' ? -1 : atoi(out));
11366 np = stzalloc(sizeof(struct nfile));
11371 np->type = NAPPEND;
11373 np->type = NCLOBBER;
11376 /* it also can be NTO2 (>&file), but we can't figure it out yet */
11382 #if ENABLE_ASH_BASH_COMPAT
11383 else if (c == 0x100 + '>') { /* this flags &> redirection */
11385 pgetc(); /* this is '>', no need to check */
11389 else { /* c == '<' */
11390 /*np->nfile.fd = 0; - stzalloc did it */
11394 if (sizeof(struct nfile) != sizeof(struct nhere)) {
11395 np = stzalloc(sizeof(struct nhere));
11396 /*np->nfile.fd = 0; - stzalloc did it */
11399 heredoc = stzalloc(sizeof(struct heredoc));
11400 heredoc->here = np;
11403 heredoc->striptabs = 1;
11405 /*heredoc->striptabs = 0; - stzalloc did it */
11411 np->type = NFROMFD;
11415 np->type = NFROMTO;
11427 goto parseredir_return;
11431 * Parse a substitution. At this point, we have read the dollar sign
11432 * and nothing else.
11435 /* is_special(c) evaluates to 1 for c in "!#$*-0123456789?@"; 0 otherwise
11436 * (assuming ascii char codes, as the original implementation did) */
11437 #define is_special(c) \
11438 (((unsigned)(c) - 33 < 32) \
11439 && ((0xc1ff920dU >> ((unsigned)(c) - 33)) & 1))
11441 unsigned char subtype;
11446 if (c > 255 /* PEOA or PEOF */
11447 || (c != '(' && c != '{' && !is_name(c) && !is_special(c))
11449 #if ENABLE_ASH_BASH_COMPAT
11451 bash_dollar_squote = 1;
11456 } else if (c == '(') {
11457 /* $(command) or $((arith)) */
11458 if (pgetc() == '(') {
11459 #if ENABLE_SH_MATH_SUPPORT
11462 raise_error_syntax("you disabled math support for $((arith)) syntax");
11469 /* $VAR, $<specialchar>, ${...}, or PEOA/PEOF */
11470 USTPUTC(CTLVAR, out);
11471 typeloc = out - (char *)stackblock();
11472 USTPUTC(VSNORMAL, out);
11473 subtype = VSNORMAL;
11479 c = '#'; /* ${#} - same as $# */
11481 subtype = VSLENGTH; /* ${#VAR} */
11486 if (c <= 255 /* not PEOA or PEOF */ && is_name(c)) {
11487 /* $[{[#]]NAME[}] */
11491 } while (c <= 255 /* not PEOA or PEOF */ && is_in_name(c));
11492 } else if (isdigit(c)) {
11493 /* $[{[#]]NUM[}] */
11497 } while (isdigit(c));
11498 } else if (is_special(c)) {
11499 /* $[{[#]]<specialchar>[}] */
11504 raise_error_syntax("bad substitution");
11506 if (c != '}' && subtype == VSLENGTH) {
11507 /* ${#VAR didn't end with } */
11513 if (subtype == 0) {
11514 /* ${VAR...} but not $VAR or ${#VAR} */
11515 /* c == first char after VAR */
11519 #if ENABLE_ASH_BASH_COMPAT
11520 if (c == ':' || c == '$' || isdigit(c)) {
11521 //TODO: support more general format ${v:EXPR:EXPR},
11522 // where EXPR follows $(()) rules
11523 subtype = VSSUBSTR;
11525 break; /* "goto do_pungetc" is bigger (!) */
11531 static const char types[] ALIGN1 = "}-+?=";
11532 const char *p = strchr(types, c);
11535 subtype = p - types + VSNORMAL;
11541 subtype = (c == '#' ? VSTRIMLEFT : VSTRIMRIGHT);
11548 #if ENABLE_ASH_BASH_COMPAT
11550 /* ${v/[/]pattern/repl} */
11551 //TODO: encode pattern and repl separately.
11552 // Currently ${v/$var_with_slash/repl} is horribly broken
11553 subtype = VSREPLACE;
11557 subtype++; /* VSREPLACEALL */
11565 if (dblquote || arinest)
11567 ((unsigned char *)stackblock())[typeloc] = subtype | flags;
11568 if (subtype != VSNORMAL) {
11570 if (dblquote || arinest) {
11575 goto parsesub_return;
11579 * Called to parse command substitutions. Newstyle is set if the command
11580 * is enclosed inside $(...); nlpp is a pointer to the head of the linked
11581 * list of commands (passed by reference), and savelen is the number of
11582 * characters on the top of the stack which must be preserved.
11585 struct nodelist **nlpp;
11588 char *volatile str;
11589 struct jmploc jmploc;
11590 struct jmploc *volatile savehandler;
11592 smallint saveprompt = 0;
11595 (void) &saveprompt;
11597 savepbq = parsebackquote;
11598 if (setjmp(jmploc.loc)) {
11600 parsebackquote = 0;
11601 exception_handler = savehandler;
11602 longjmp(exception_handler->loc, 1);
11606 savelen = out - (char *)stackblock();
11608 str = ckmalloc(savelen);
11609 memcpy(str, stackblock(), savelen);
11611 savehandler = exception_handler;
11612 exception_handler = &jmploc;
11615 /* We must read until the closing backquote, giving special
11616 treatment to some slashes, and then push the string and
11617 reread it as input, interpreting it normally. */
11622 STARTSTACKSTR(pout);
11626 setprompt_if(needprompt, 2);
11635 g_parsefile->linno++;
11636 setprompt_if(doprompt, 2);
11638 * If eating a newline, avoid putting
11639 * the newline into the new character
11640 * stream (via the STPUTC after the
11645 if (pc != '\\' && pc != '`' && pc != '$'
11646 && (!dblquote || pc != '"')
11648 STPUTC('\\', pout);
11650 if (pc <= 255 /* not PEOA or PEOF */) {
11656 IF_ASH_ALIAS(case PEOA:)
11657 startlinno = g_parsefile->linno;
11658 raise_error_syntax("EOF in backquote substitution");
11661 g_parsefile->linno++;
11662 needprompt = doprompt;
11671 STPUTC('\0', pout);
11672 psavelen = pout - (char *)stackblock();
11673 if (psavelen > 0) {
11674 pstr = grabstackstr(pout);
11675 setinputstring(pstr);
11680 nlpp = &(*nlpp)->next;
11681 *nlpp = stzalloc(sizeof(**nlpp));
11682 /* (*nlpp)->next = NULL; - stzalloc did it */
11683 parsebackquote = oldstyle;
11686 saveprompt = doprompt;
11693 doprompt = saveprompt;
11694 else if (readtoken() != TRP)
11695 raise_error_unexpected_syntax(TRP);
11700 * Start reading from old file again, ignoring any pushed back
11701 * tokens left from the backquote parsing
11706 while (stackblocksize() <= savelen)
11708 STARTSTACKSTR(out);
11710 memcpy(out, str, savelen);
11711 STADJUST(savelen, out);
11717 parsebackquote = savepbq;
11718 exception_handler = savehandler;
11719 if (arinest || dblquote)
11720 USTPUTC(CTLBACKQ | CTLQUOTE, out);
11722 USTPUTC(CTLBACKQ, out);
11724 goto parsebackq_oldreturn;
11725 goto parsebackq_newreturn;
11728 #if ENABLE_SH_MATH_SUPPORT
11730 * Parse an arithmetic expansion (indicate start of one and set state)
11733 if (++arinest == 1) {
11734 prevsyntax = syntax;
11735 syntax = ARISYNTAX;
11736 USTPUTC(CTLARI, out);
11743 * we collapse embedded arithmetic expansion to
11744 * parenthesis, which should be equivalent
11748 goto parsearith_return;
11752 } /* end of readtoken */
11755 * Read the next input token.
11756 * If the token is a word, we set backquotelist to the list of cmds in
11757 * backquotes. We set quoteflag to true if any part of the word was
11759 * If the token is TREDIR, then we set redirnode to a structure containing
11761 * In all cases, the variable startlinno is set to the number of the line
11762 * on which the token starts.
11764 * [Change comment: here documents and internal procedures]
11765 * [Readtoken shouldn't have any arguments. Perhaps we should make the
11766 * word parsing code into a separate routine. In this case, readtoken
11767 * doesn't need to have any internal procedures, but parseword does.
11768 * We could also make parseoperator in essence the main routine, and
11769 * have parseword (readtoken1?) handle both words and redirection.]
11771 #define NEW_xxreadtoken
11772 #ifdef NEW_xxreadtoken
11773 /* singles must be first! */
11774 static const char xxreadtoken_chars[7] ALIGN1 = {
11775 '\n', '(', ')', /* singles */
11776 '&', '|', ';', /* doubles */
11780 #define xxreadtoken_singles 3
11781 #define xxreadtoken_doubles 3
11783 static const char xxreadtoken_tokens[] ALIGN1 = {
11784 TNL, TLP, TRP, /* only single occurrence allowed */
11785 TBACKGND, TPIPE, TSEMI, /* if single occurrence */
11786 TEOF, /* corresponds to trailing nul */
11787 TAND, TOR, TENDCASE /* if double occurrence */
11799 setprompt_if(needprompt, 2);
11800 startlinno = g_parsefile->linno;
11801 for (;;) { /* until token or start of word found */
11803 if (c == ' ' || c == '\t' IF_ASH_ALIAS( || c == PEOA))
11807 while ((c = pgetc()) != '\n' && c != PEOF)
11810 } else if (c == '\\') {
11811 if (pgetc() != '\n') {
11813 break; /* return readtoken1(...) */
11815 startlinno = ++g_parsefile->linno;
11816 setprompt_if(doprompt, 2);
11820 p = xxreadtoken_chars + sizeof(xxreadtoken_chars) - 1;
11823 g_parsefile->linno++;
11824 needprompt = doprompt;
11827 p = strchr(xxreadtoken_chars, c);
11829 break; /* return readtoken1(...) */
11831 if ((int)(p - xxreadtoken_chars) >= xxreadtoken_singles) {
11833 if (cc == c) { /* double occurrence? */
11834 p += xxreadtoken_doubles + 1;
11837 #if ENABLE_ASH_BASH_COMPAT
11838 if (c == '&' && cc == '>') /* &> */
11839 break; /* return readtoken1(...) */
11844 lasttoken = xxreadtoken_tokens[p - xxreadtoken_chars];
11849 return readtoken1(c, BASESYNTAX, (char *) NULL, 0);
11851 #else /* old xxreadtoken */
11852 #define RETURN(token) return lasttoken = token
11862 setprompt_if(needprompt, 2);
11863 startlinno = g_parsefile->linno;
11864 for (;;) { /* until token or start of word found */
11867 case ' ': case '\t':
11868 IF_ASH_ALIAS(case PEOA:)
11871 while ((c = pgetc()) != '\n' && c != PEOF)
11876 if (pgetc() == '\n') {
11877 startlinno = ++g_parsefile->linno;
11878 setprompt_if(doprompt, 2);
11884 g_parsefile->linno++;
11885 needprompt = doprompt;
11890 if (pgetc() == '&')
11895 if (pgetc() == '|')
11900 if (pgetc() == ';')
11913 return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
11916 #endif /* old xxreadtoken */
11923 smallint alreadyseen = tokpushback;
11926 #if ENABLE_ASH_ALIAS
11935 if (checkkwd & CHKNL) {
11942 if (t != TWORD || quoteflag) {
11947 * check for keywords
11949 if (checkkwd & CHKKWD) {
11950 const char *const *pp;
11952 pp = findkwd(wordtext);
11954 lasttoken = t = pp - tokname_array;
11955 TRACE(("keyword '%s' recognized\n", tokname_array[t] + 1));
11960 if (checkkwd & CHKALIAS) {
11961 #if ENABLE_ASH_ALIAS
11963 ap = lookupalias(wordtext, 1);
11966 pushstring(ap->val, ap);
11976 TRACE(("token '%s' %s\n", tokname_array[t] + 1, t == TWORD ? wordtext : ""));
11978 TRACE(("reread token '%s' %s\n", tokname_array[t] + 1, t == TWORD ? wordtext : ""));
11990 return tokname_array[t][0];
11994 * Read and parse a command. Returns NODE_EOF on end of file.
11995 * (NULL is a valid parse tree indicating a blank line.)
11997 static union node *
11998 parsecmd(int interact)
12003 doprompt = interact;
12004 setprompt_if(doprompt, doprompt);
12016 * Input any here documents.
12021 struct heredoc *here;
12024 here = heredoclist;
12025 heredoclist = NULL;
12028 setprompt_if(needprompt, 2);
12029 readtoken1(pgetc(), here->here->type == NHERE ? SQSYNTAX : DQSYNTAX,
12030 here->eofmark, here->striptabs);
12031 n = stzalloc(sizeof(struct narg));
12032 n->narg.type = NARG;
12033 /*n->narg.next = NULL; - stzalloc did it */
12034 n->narg.text = wordtext;
12035 n->narg.backquote = backquotelist;
12036 here->here->nhere.doc = n;
12043 * called by editline -- any expansions to the prompt should be added here.
12045 #if ENABLE_ASH_EXPAND_PRMT
12046 static const char *
12047 expandstr(const char *ps)
12051 /* XXX Fix (char *) cast. It _is_ a bug. ps is variable's value,
12052 * and token processing _can_ alter it (delete NULs etc). */
12053 setinputstring((char *)ps);
12054 readtoken1(pgetc(), PSSYNTAX, nullstr, 0);
12057 n.narg.type = NARG;
12058 n.narg.next = NULL;
12059 n.narg.text = wordtext;
12060 n.narg.backquote = backquotelist;
12062 expandarg(&n, NULL, 0);
12063 return stackblock();
12068 * Execute a command or commands contained in a string.
12071 evalstring(char *s, int mask)
12074 struct stackmark smark;
12078 setstackmark(&smark);
12081 while ((n = parsecmd(0)) != NODE_EOF) {
12083 popstackmark(&smark);
12096 * The eval command.
12098 static int FAST_FUNC
12099 evalcmd(int argc UNUSED_PARAM, char **argv)
12108 STARTSTACKSTR(concat);
12110 concat = stack_putstr(p, concat);
12114 STPUTC(' ', concat);
12116 STPUTC('\0', concat);
12117 p = grabstackstr(concat);
12119 evalstring(p, ~SKIPEVAL);
12125 * Read and execute commands.
12126 * "Top" is nonzero for the top level command loop;
12127 * it turns on prompting if the shell is interactive.
12133 struct stackmark smark;
12137 TRACE(("cmdloop(%d) called\n", top));
12141 setstackmark(&smark);
12144 showjobs(stderr, SHOW_CHANGED);
12147 if (iflag && top) {
12151 n = parsecmd(inter);
12153 if (DEBUG > 2 && debug && (n != NODE_EOF))
12156 if (n == NODE_EOF) {
12157 if (!top || numeof >= 50)
12159 if (!stoppedjobs()) {
12162 out2str("\nUse \"exit\" to leave shell.\n");
12165 } else if (nflag == 0) {
12166 /* job_warning can only be 2,1,0. Here 2->1, 1/0->0 */
12171 popstackmark(&smark);
12176 return skip & SKIPEVAL;
12183 * Take commands from a file. To be compatible we should do a path
12184 * search for the file, which is necessary to find sub-commands.
12187 find_dot_file(char *name)
12190 const char *path = pathval();
12193 /* don't try this for absolute or relative paths */
12194 if (strchr(name, '/'))
12197 /* IIRC standards do not say whether . is to be searched.
12198 * And it is even smaller this way, making it unconditional for now:
12200 if (1) { /* ENABLE_ASH_BASH_COMPAT */
12205 while ((fullname = path_advance(&path, name)) != NULL) {
12207 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
12209 * Don't bother freeing here, since it will
12210 * be freed by the caller.
12214 if (fullname != name)
12215 stunalloc(fullname);
12218 /* not found in the PATH */
12219 ash_msg_and_raise_error("%s: not found", name);
12223 static int FAST_FUNC
12224 dotcmd(int argc, char **argv)
12227 struct strlist *sp;
12228 volatile struct shparam saveparam;
12230 for (sp = cmdenviron; sp; sp = sp->next)
12231 setvareq(ckstrdup(sp->text), VSTRFIXED | VTEXTFIXED);
12234 /* bash says: "bash: .: filename argument required" */
12235 return 2; /* bash compat */
12238 /* "false; . empty_file; echo $?" should print 0, not 1: */
12241 fullname = find_dot_file(argv[1]);
12245 if (argc) { /* argc > 0, argv[0] != NULL */
12246 saveparam = shellparam;
12247 shellparam.malloced = 0;
12248 shellparam.nparam = argc;
12249 shellparam.p = argv;
12252 setinputfile(fullname, INPUT_PUSH_FILE);
12253 commandname = fullname;
12258 freeparam(&shellparam);
12259 shellparam = saveparam;
12265 static int FAST_FUNC
12266 exitcmd(int argc UNUSED_PARAM, char **argv)
12271 exitstatus = number(argv[1]);
12272 raise_exception(EXEXIT);
12277 * Read a file containing shell functions.
12280 readcmdfile(char *name)
12282 setinputfile(name, INPUT_PUSH_FILE);
12288 /* ============ find_command inplementation */
12291 * Resolve a command name. If you change this routine, you may have to
12292 * change the shellexec routine as well.
12295 find_command(char *name, struct cmdentry *entry, int act, const char *path)
12297 struct tblentry *cmdp;
12304 struct builtincmd *bcmd;
12306 /* If name contains a slash, don't use PATH or hash table */
12307 if (strchr(name, '/') != NULL) {
12308 entry->u.index = -1;
12309 if (act & DO_ABS) {
12310 while (stat(name, &statb) < 0) {
12312 if (errno == EINTR)
12315 entry->cmdtype = CMDUNKNOWN;
12319 entry->cmdtype = CMDNORMAL;
12323 /* #if ENABLE_FEATURE_SH_STANDALONE... moved after builtin check */
12325 updatetbl = (path == pathval());
12328 if (strstr(path, "%builtin") != NULL)
12329 act |= DO_ALTBLTIN;
12332 /* If name is in the table, check answer will be ok */
12333 cmdp = cmdlookup(name, 0);
12334 if (cmdp != NULL) {
12337 switch (cmdp->cmdtype) {
12355 } else if (cmdp->rehash == 0)
12356 /* if not invalidated by cd, we're done */
12360 /* If %builtin not in path, check for builtin next */
12361 bcmd = find_builtin(name);
12363 if (IS_BUILTIN_REGULAR(bcmd))
12364 goto builtin_success;
12365 if (act & DO_ALTPATH) {
12366 if (!(act & DO_ALTBLTIN))
12367 goto builtin_success;
12368 } else if (builtinloc <= 0) {
12369 goto builtin_success;
12373 #if ENABLE_FEATURE_SH_STANDALONE
12375 int applet_no = find_applet_by_name(name);
12376 if (applet_no >= 0) {
12377 entry->cmdtype = CMDNORMAL;
12378 entry->u.index = -2 - applet_no;
12384 /* We have to search path. */
12385 prev = -1; /* where to start */
12386 if (cmdp && cmdp->rehash) { /* doing a rehash */
12387 if (cmdp->cmdtype == CMDBUILTIN)
12390 prev = cmdp->param.index;
12396 while ((fullname = path_advance(&path, name)) != NULL) {
12397 stunalloc(fullname);
12398 /* NB: code below will still use fullname
12399 * despite it being "unallocated" */
12402 if (prefix(pathopt, "builtin")) {
12404 goto builtin_success;
12407 if ((act & DO_NOFUNC)
12408 || !prefix(pathopt, "func")
12409 ) { /* ignore unimplemented options */
12413 /* if rehash, don't redo absolute path names */
12414 if (fullname[0] == '/' && idx <= prev) {
12417 TRACE(("searchexec \"%s\": no change\n", name));
12420 while (stat(fullname, &statb) < 0) {
12422 if (errno == EINTR)
12425 if (errno != ENOENT && errno != ENOTDIR)
12429 e = EACCES; /* if we fail, this will be the error */
12430 if (!S_ISREG(statb.st_mode))
12432 if (pathopt) { /* this is a %func directory */
12433 stalloc(strlen(fullname) + 1);
12434 /* NB: stalloc will return space pointed by fullname
12435 * (because we don't have any intervening allocations
12436 * between stunalloc above and this stalloc) */
12437 readcmdfile(fullname);
12438 cmdp = cmdlookup(name, 0);
12439 if (cmdp == NULL || cmdp->cmdtype != CMDFUNCTION)
12440 ash_msg_and_raise_error("%s not defined in %s", name, fullname);
12441 stunalloc(fullname);
12444 TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
12446 entry->cmdtype = CMDNORMAL;
12447 entry->u.index = idx;
12451 cmdp = cmdlookup(name, 1);
12452 cmdp->cmdtype = CMDNORMAL;
12453 cmdp->param.index = idx;
12458 /* We failed. If there was an entry for this command, delete it */
12459 if (cmdp && updatetbl)
12460 delete_cmd_entry();
12462 ash_msg("%s: %s", name, errmsg(e, "not found"));
12463 entry->cmdtype = CMDUNKNOWN;
12468 entry->cmdtype = CMDBUILTIN;
12469 entry->u.cmd = bcmd;
12473 cmdp = cmdlookup(name, 1);
12474 cmdp->cmdtype = CMDBUILTIN;
12475 cmdp->param.cmd = bcmd;
12479 entry->cmdtype = cmdp->cmdtype;
12480 entry->u = cmdp->param;
12484 /* ============ trap.c */
12487 * The trap builtin.
12489 static int FAST_FUNC
12490 trapcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12494 int signo, exitcode;
12499 for (signo = 0; signo < NSIG; signo++) {
12500 char *tr = trap_ptr[signo];
12502 /* note: bash adds "SIG", but only if invoked
12503 * as "bash". If called as "sh", or if set -o posix,
12504 * then it prints short signal names.
12505 * We are printing short names: */
12506 out1fmt("trap -- %s %s\n",
12508 get_signame(signo));
12509 /* trap_ptr != trap only if we are in special-cased `trap` code.
12510 * In this case, we will exit very soon, no need to free(). */
12511 /* if (trap_ptr != trap && tp[0]) */
12516 if (trap_ptr != trap) {
12529 signo = get_signum(*ap);
12531 /* Mimic bash message exactly */
12532 ash_msg("%s: invalid signal specification", *ap);
12538 if (LONE_DASH(action))
12541 action = ckstrdup(action);
12545 may_have_traps = 1;
12546 trap[signo] = action;
12557 /* ============ Builtins */
12559 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
12561 * Lists available builtins
12563 static int FAST_FUNC
12564 helpcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12570 "Built-in commands:\n"
12571 "------------------\n");
12572 for (col = 0, i = 0; i < ARRAY_SIZE(builtintab); i++) {
12573 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '),
12574 builtintab[i].name + 1);
12580 #if ENABLE_FEATURE_SH_STANDALONE
12582 const char *a = applet_names;
12584 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '), a);
12589 a += strlen(a) + 1;
12594 return EXIT_SUCCESS;
12596 #endif /* FEATURE_SH_EXTRA_QUIET */
12599 * The export and readonly commands.
12601 static int FAST_FUNC
12602 exportcmd(int argc UNUSED_PARAM, char **argv)
12608 int flag = argv[0][0] == 'r' ? VREADONLY : VEXPORT;
12610 if (nextopt("p") != 'p') {
12615 p = strchr(name, '=');
12619 vp = *findvar(hashvar(name), name);
12625 setvar(name, p, flag);
12626 } while ((name = *++aptr) != NULL);
12630 showvars(argv[0], flag, 0);
12635 * Delete a function if it exists.
12638 unsetfunc(const char *name)
12640 struct tblentry *cmdp;
12642 cmdp = cmdlookup(name, 0);
12643 if (cmdp != NULL && cmdp->cmdtype == CMDFUNCTION)
12644 delete_cmd_entry();
12648 * The unset builtin command. We unset the function before we unset the
12649 * variable to allow a function to be unset when there is a readonly variable
12650 * with the same name.
12652 static int FAST_FUNC
12653 unsetcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12660 while ((i = nextopt("vf")) != 0) {
12664 for (ap = argptr; *ap; ap++) {
12677 static const unsigned char timescmd_str[] ALIGN1 = {
12678 ' ', offsetof(struct tms, tms_utime),
12679 '\n', offsetof(struct tms, tms_stime),
12680 ' ', offsetof(struct tms, tms_cutime),
12681 '\n', offsetof(struct tms, tms_cstime),
12684 static int FAST_FUNC
12685 timescmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12687 unsigned long clk_tck, s, t;
12688 const unsigned char *p;
12691 clk_tck = sysconf(_SC_CLK_TCK);
12696 t = *(clock_t *)(((char *) &buf) + p[1]);
12699 out1fmt("%lum%lu.%03lus%c",
12701 (t * 1000) / clk_tck,
12709 #if ENABLE_SH_MATH_SUPPORT
12711 * The let builtin. Partially stolen from GNU Bash, the Bourne Again SHell.
12712 * Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
12714 * Copyright (C) 2003 Vladimir Oleynik <dzo@simtreas.ru>
12716 static int FAST_FUNC
12717 letcmd(int argc UNUSED_PARAM, char **argv)
12723 ash_msg_and_raise_error("expression expected");
12725 i = ash_arith(*argv);
12733 * The read builtin. Options:
12734 * -r Do not interpret '\' specially
12735 * -s Turn off echo (tty only)
12736 * -n NCHARS Read NCHARS max
12737 * -p PROMPT Display PROMPT on stderr (if input is from tty)
12738 * -t SECONDS Timeout after SECONDS (tty or pipe only)
12739 * -u FD Read from given FD instead of fd 0
12740 * This uses unbuffered input, which may be avoidable in some cases.
12741 * TODO: bash also has:
12742 * -a ARRAY Read into array[0],[1],etc
12743 * -d DELIM End on DELIM char, not newline
12744 * -e Use line editing (tty only)
12746 static int FAST_FUNC
12747 readcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
12749 char *opt_n = NULL;
12750 char *opt_p = NULL;
12751 char *opt_t = NULL;
12752 char *opt_u = NULL;
12753 int read_flags = 0;
12757 while ((i = nextopt("p:u:rt:n:s")) != '\0') {
12766 read_flags |= BUILTIN_READ_SILENT;
12772 read_flags |= BUILTIN_READ_RAW;
12782 r = shell_builtin_read(setvar2,
12784 bltinlookup("IFS"), /* can be NULL */
12792 if ((uintptr_t)r > 1)
12793 ash_msg_and_raise_error(r);
12795 return (uintptr_t)r;
12798 static int FAST_FUNC
12799 umaskcmd(int argc UNUSED_PARAM, char **argv)
12801 static const char permuser[3] ALIGN1 = "ugo";
12802 static const char permmode[3] ALIGN1 = "rwx";
12803 static const short permmask[] ALIGN2 = {
12804 S_IRUSR, S_IWUSR, S_IXUSR,
12805 S_IRGRP, S_IWGRP, S_IXGRP,
12806 S_IROTH, S_IWOTH, S_IXOTH
12809 /* TODO: use bb_parse_mode() instead */
12814 int symbolic_mode = 0;
12816 while (nextopt("S") != '\0') {
12827 if (symbolic_mode) {
12831 for (i = 0; i < 3; i++) {
12834 *p++ = permuser[i];
12836 for (j = 0; j < 3; j++) {
12837 if ((mask & permmask[3 * i + j]) == 0) {
12838 *p++ = permmode[j];
12846 out1fmt("%.4o\n", mask);
12849 if (isdigit((unsigned char) *ap)) {
12852 if (*ap >= '8' || *ap < '0')
12853 ash_msg_and_raise_error(msg_illnum, argv[1]);
12854 mask = (mask << 3) + (*ap - '0');
12855 } while (*++ap != '\0');
12858 mask = ~mask & 0777;
12859 if (!bb_parse_mode(ap, &mask)) {
12860 ash_msg_and_raise_error("illegal mode: %s", ap);
12862 umask(~mask & 0777);
12868 static int FAST_FUNC
12869 ulimitcmd(int argc UNUSED_PARAM, char **argv)
12871 return shell_builtin_ulimit(argv);
12874 /* ============ main() and helpers */
12877 * Called to exit the shell.
12886 status = exitstatus;
12887 TRACE(("pid %d, exitshell(%d)\n", getpid(), status));
12888 if (setjmp(loc.loc)) {
12889 if (exception_type == EXEXIT)
12890 /* dash bug: it just does _exit(exitstatus) here
12891 * but we have to do setjobctl(0) first!
12892 * (bug is still not fixed in dash-0.5.3 - if you run dash
12893 * under Midnight Commander, on exit from dash MC is backgrounded) */
12894 status = exitstatus;
12897 exception_handler = &loc;
12904 flush_stdout_stderr();
12914 /* from input.c: */
12915 /* we will never free this */
12916 basepf.next_to_pgetc = basepf.buf = ckmalloc(IBUFSIZ);
12919 signal(SIGCHLD, SIG_DFL);
12920 /* bash re-enables SIGHUP which is SIG_IGNed on entry.
12921 * Try: "trap '' HUP; bash; echo RET" and type "kill -HUP $$"
12923 signal(SIGHUP, SIG_DFL);
12929 struct stat st1, st2;
12932 for (envp = environ; envp && *envp; envp++) {
12933 if (strchr(*envp, '=')) {
12934 setvareq(*envp, VEXPORT|VTEXTFIXED);
12938 setvar("PPID", utoa(getppid()), 0);
12940 p = lookupvar("PWD");
12942 if (*p != '/' || stat(p, &st1) || stat(".", &st2)
12943 || st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino
12953 //usage:#define ash_trivial_usage
12954 //usage: "[-/+OPTIONS] [-/+o OPT]... [-c 'SCRIPT' [ARG0 [ARGS]] / FILE [ARGS]]"
12955 //usage:#define ash_full_usage "\n\n"
12956 //usage: "Unix shell interpreter"
12958 //usage:#if ENABLE_FEATURE_SH_IS_ASH
12959 //usage:# define sh_trivial_usage ash_trivial_usage
12960 //usage:# define sh_full_usage ash_full_usage
12962 //usage:#if ENABLE_FEATURE_BASH_IS_ASH
12963 //usage:# define bash_trivial_usage ash_trivial_usage
12964 //usage:# define bash_full_usage ash_full_usage
12968 * Process the shell command line arguments.
12971 procargs(char **argv)
12974 const char *xminusc;
12979 /* if (xargv[0]) - mmm, this is always true! */
12981 for (i = 0; i < NOPTS; i++)
12984 if (options(/*cmdline:*/ 1)) {
12985 /* it already printed err message */
12986 raise_exception(EXERROR);
12990 if (*xargv == NULL) {
12992 ash_msg_and_raise_error(bb_msg_requires_arg, "-c");
12995 if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
12999 for (i = 0; i < NOPTS; i++)
13000 if (optlist[i] == 2)
13005 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
13010 } else if (!sflag) {
13011 setinputfile(*xargv, 0);
13014 commandname = arg0;
13017 shellparam.p = xargv;
13018 #if ENABLE_ASH_GETOPTS
13019 shellparam.optind = 1;
13020 shellparam.optoff = -1;
13022 /* assert(shellparam.malloced == 0 && shellparam.nparam == 0); */
13024 shellparam.nparam++;
13031 * Read /etc/profile or .profile.
13034 read_profile(const char *name)
13038 if (setinputfile(name, INPUT_PUSH_FILE | INPUT_NOFILE_OK) < 0)
13047 * This routine is called when an error or an interrupt occurs in an
13048 * interactive shell and control is returned to the main command loop.
13056 /* from input.c: */
13057 g_parsefile->left_in_buffer = 0;
13058 g_parsefile->left_in_line = 0; /* clear input buffer */
13060 /* from parser.c: */
13063 /* from redir.c: */
13064 clearredir(/*drop:*/ 0);
13068 static short profile_buf[16384];
13069 extern int etext();
13073 * Main routine. We initialize things, parse the arguments, execute
13074 * profiles if we're a login shell, and then call cmdloop to execute
13075 * commands. The setjmp call sets up the location to jump to when an
13076 * exception occurs. When an exception occurs the variable "state"
13077 * is used to figure out how far we had gotten.
13079 int ash_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
13080 int ash_main(int argc UNUSED_PARAM, char **argv)
13082 const char *shinit;
13083 volatile smallint state;
13084 struct jmploc jmploc;
13085 struct stackmark smark;
13087 /* Initialize global data */
13091 #if ENABLE_ASH_ALIAS
13097 monitor(4, etext, profile_buf, sizeof(profile_buf), 50);
13100 #if ENABLE_FEATURE_EDITING
13101 line_input_state = new_line_input_t(FOR_SHELL | WITH_PATH_LOOKUP);
13104 if (setjmp(jmploc.loc)) {
13110 e = exception_type;
13114 if (e == EXEXIT || s == 0 || iflag == 0 || shlvl) {
13118 outcslow('\n', stderr);
13121 popstackmark(&smark);
13122 FORCE_INT_ON; /* enable interrupts */
13131 exception_handler = &jmploc;
13134 TRACE(("Shell args: "));
13135 trace_puts_args(argv);
13137 rootpid = getpid();
13140 setstackmark(&smark);
13143 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
13145 const char *hp = lookupvar("HISTFILE");
13147 hp = lookupvar("HOME");
13149 char *defhp = concat_path_file(hp, ".ash_history");
13150 setvar("HISTFILE", defhp, 0);
13156 if (argv[0] && argv[0][0] == '-')
13160 read_profile("/etc/profile");
13163 read_profile(".profile");
13169 getuid() == geteuid() && getgid() == getegid() &&
13173 shinit = lookupvar("ENV");
13174 if (shinit != NULL && *shinit != '\0') {
13175 read_profile(shinit);
13181 /* evalstring pushes parsefile stack.
13182 * Ensure we don't falsely claim that 0 (stdin)
13183 * is one of stacked source fds.
13184 * Testcase: ash -c 'exec 1>&0' must not complain. */
13185 // if (!sflag) g_parsefile->pf_fd = -1;
13186 // ^^ not necessary since now we special-case fd 0
13187 // in is_hidden_fd() to not be considered "hidden fd"
13188 evalstring(minusc, 0);
13191 if (sflag || minusc == NULL) {
13192 #if defined MAX_HISTORY && MAX_HISTORY > 0 && ENABLE_FEATURE_EDITING_SAVEHISTORY
13194 const char *hp = lookupvar("HISTFILE");
13196 line_input_state->hist_file = hp;
13197 # if ENABLE_FEATURE_SH_HISTFILESIZE
13198 hp = lookupvar("HISTFILESIZE");
13199 line_input_state->max_history = size_from_HISTFILESIZE(hp);
13203 state4: /* XXX ??? - why isn't this before the "if" statement */
13211 extern void _mcleanup(void);
13215 TRACE(("End of main reached\n"));
13222 * Copyright (c) 1989, 1991, 1993, 1994
13223 * The Regents of the University of California. All rights reserved.
13225 * This code is derived from software contributed to Berkeley by
13226 * Kenneth Almquist.
13228 * Redistribution and use in source and binary forms, with or without
13229 * modification, are permitted provided that the following conditions
13231 * 1. Redistributions of source code must retain the above copyright
13232 * notice, this list of conditions and the following disclaimer.
13233 * 2. Redistributions in binary form must reproduce the above copyright
13234 * notice, this list of conditions and the following disclaimer in the
13235 * documentation and/or other materials provided with the distribution.
13236 * 3. Neither the name of the University nor the names of its contributors
13237 * may be used to endorse or promote products derived from this software
13238 * without specific prior written permission.
13240 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
13241 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
13242 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
13243 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
13244 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
13245 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
13246 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
13247 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
13248 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
13249 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF