2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 * Copyright (c) 1997-2005
5 * Herbert Xu <herbert@gondor.apana.org.au>. All rights reserved.
7 * This code is derived from software contributed to Berkeley by
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 4. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 static char sccsid[] = "@(#)expand.c 8.5 (Berkeley) 5/15/95";
40 #include <sys/cdefs.h>
41 __FBSDID("$FreeBSD$");
43 #include <sys/types.h>
59 * Routines to expand arguments to commands. We have to deal with
60 * backquotes, shell variables, and file metacharacters.
83 * Structure specifying which parts of the string should be searched
88 struct ifsregion *next; /* next region in list */
89 int begoff; /* offset of start of region */
90 int endoff; /* offset of end of region */
91 int inquotes; /* search for nul bytes only */
95 static char *expdest; /* output of current string */
96 static struct nodelist *argbackq; /* list of back quote expressions */
97 static struct ifsregion ifsfirst; /* first struct in list of ifs regions */
98 static struct ifsregion *ifslastp; /* last struct in list */
99 static struct arglist exparg; /* holds expanded arg list */
101 static char *argstr(char *, int);
102 static char *exptilde(char *, int);
103 static char *expari(char *);
104 static void expbackq(union node *, int, int);
105 static int subevalvar(char *, char *, int, int, int, int, int);
106 static char *evalvar(char *, int);
107 static int varisset(const char *, int);
108 static void varvalue(const char *, int, int, int);
109 static void recordregion(int, int, int);
110 static void removerecordregions(int);
111 static void ifsbreakup(char *, struct arglist *);
112 static void expandmeta(struct strlist *, int);
113 static void expmeta(char *, char *);
114 static void addfname(char *);
115 static struct strlist *expsort(struct strlist *);
116 static struct strlist *msort(struct strlist *, int);
117 static int patmatch(const char *, const char *, int);
118 static char *cvtnum(int, char *);
119 static int collate_range_cmp(wchar_t, wchar_t);
122 collate_range_cmp(wchar_t c1, wchar_t c2)
124 static wchar_t s1[2], s2[2];
128 return (wcscoll(s1, s2));
132 stputs_quotes(const char *data, const char *syntax, char *p)
136 if (syntax[(int)*data] == CCTL)
142 #define STPUTS_QUOTES(data, syntax, p) p = stputs_quotes((data), syntax, p)
145 * Perform expansions on an argument, placing the resulting list of arguments
146 * in arglist. Parameter expansion, command substitution and arithmetic
147 * expansion are always performed; additional expansions can be requested
149 * The result is left in the stack string.
150 * When arglist is NULL, perform here document expansion.
152 * Caution: this function uses global state and is not reentrant.
153 * However, a new invocation after an interrupted invocation is safe
154 * and will reset the global state for the new call.
157 expandarg(union node *arg, struct arglist *arglist, int flag)
162 argbackq = arg->narg.backquote;
163 STARTSTACKSTR(expdest);
164 ifsfirst.next = NULL;
166 argstr(arg->narg.text, flag);
167 if (arglist == NULL) {
168 STACKSTRNUL(expdest);
169 return; /* here document expanded */
171 STPUTC('\0', expdest);
172 p = grabstackstr(expdest);
173 exparg.lastp = &exparg.list;
174 if (flag & EXP_FULL) {
175 ifsbreakup(p, &exparg);
176 *exparg.lastp = NULL;
177 exparg.lastp = &exparg.list;
178 expandmeta(exparg.list, flag);
180 sp = (struct strlist *)stalloc(sizeof (struct strlist));
183 exparg.lastp = &sp->next;
185 while (ifsfirst.next != NULL) {
186 struct ifsregion *ifsp;
188 ifsp = ifsfirst.next->next;
189 ckfree(ifsfirst.next);
190 ifsfirst.next = ifsp;
193 *exparg.lastp = NULL;
195 *arglist->lastp = exparg.list;
196 arglist->lastp = exparg.lastp;
203 * Perform parameter expansion, command substitution and arithmetic
204 * expansion, and tilde expansion if requested via EXP_TILDE/EXP_VARTILDE.
205 * Processing ends at a CTLENDVAR or CTLENDARI character as well as '\0'.
206 * This is used to expand word in ${var+word} etc.
207 * If EXP_FULL or EXP_CASE are set, keep and/or generate CTLESC
208 * characters to allow for further processing.
209 * If EXP_FULL is set, also preserve CTLQUOTEMARK characters.
212 argstr(char *p, int flag)
215 int quotes = flag & (EXP_FULL | EXP_CASE); /* do CTLESC */
220 split_lit = flag & EXP_SPLIT_LIT;
221 lit_quoted = flag & EXP_LIT_QUOTED;
222 flag &= ~(EXP_SPLIT_LIT | EXP_LIT_QUOTED);
223 if (*p == '~' && (flag & (EXP_TILDE | EXP_VARTILDE)))
224 p = exptilde(p, flag);
226 CHECKSTRSPACE(2, expdest);
235 /* "$@" syntax adherence hack */
236 if (p[0] == CTLVAR && p[2] == '@' && p[3] == '=')
238 if ((flag & EXP_FULL) != 0)
249 if (split_lit && !lit_quoted)
250 recordregion(expdest - stackblock() -
252 expdest - stackblock(), 0);
255 p = evalvar(p, flag);
258 case CTLBACKQ|CTLQUOTE:
259 expbackq(argbackq->n, c & CTLQUOTE, flag);
260 argbackq = argbackq->next;
268 * sort of a hack - expand tildes in variable
269 * assignments (after the first '=' and after ':'s).
272 if (split_lit && !lit_quoted)
273 recordregion(expdest - stackblock() - 1,
274 expdest - stackblock(), 0);
275 if (flag & EXP_VARTILDE && *p == '~' &&
276 (c != '=' || firsteq)) {
279 p = exptilde(p, flag);
284 if (split_lit && !lit_quoted)
285 recordregion(expdest - stackblock() - 1,
286 expdest - stackblock(), 0);
292 * Perform tilde expansion, placing the result in the stack string and
293 * returning the next position in the input string to process.
296 exptilde(char *p, int flag)
301 int quotes = flag & (EXP_FULL | EXP_CASE);
303 while ((c = *p) != '\0') {
305 case CTLESC: /* This means CTL* are always considered quoted. */
308 case CTLBACKQ | CTLQUOTE:
314 if (flag & EXP_VARTILDE)
325 if (*(startp+1) == '\0') {
326 home = lookupvar("HOME");
328 pw = getpwnam(startp+1);
329 home = pw != NULL ? pw->pw_dir : NULL;
332 if (home == NULL || *home == '\0')
335 STPUTS_QUOTES(home, DQSYNTAX, expdest);
337 STPUTS(home, expdest);
343 removerecordregions(int endoff)
345 if (ifslastp == NULL)
348 if (ifsfirst.endoff > endoff) {
349 while (ifsfirst.next != NULL) {
350 struct ifsregion *ifsp;
352 ifsp = ifsfirst.next->next;
353 ckfree(ifsfirst.next);
354 ifsfirst.next = ifsp;
357 if (ifsfirst.begoff > endoff)
360 ifslastp = &ifsfirst;
361 ifsfirst.endoff = endoff;
366 ifslastp = &ifsfirst;
367 while (ifslastp->next && ifslastp->next->begoff < endoff)
368 ifslastp=ifslastp->next;
369 while (ifslastp->next != NULL) {
370 struct ifsregion *ifsp;
372 ifsp = ifslastp->next->next;
373 ckfree(ifslastp->next);
374 ifslastp->next = ifsp;
377 if (ifslastp->endoff > endoff)
378 ifslastp->endoff = endoff;
382 * Expand arithmetic expression.
383 * Note that flag is not required as digits never require CTLESC characters.
394 quoted = *p++ == '"';
395 begoff = expdest - stackblock();
397 removerecordregions(begoff);
398 STPUTC('\0', expdest);
399 start = stackblock() + begoff;
401 q = grabstackstr(expdest);
402 result = arith(start);
403 ungrabstackstr(q, expdest);
405 start = stackblock() + begoff;
406 adj = start - expdest;
407 STADJUST(adj, expdest);
409 CHECKSTRSPACE((int)(DIGITS(result) + 1), expdest);
410 fmtstr(expdest, DIGITS(result), ARITH_FORMAT_STR, result);
411 adj = strlen(expdest);
412 STADJUST(adj, expdest);
414 recordregion(begoff, expdest - stackblock(), 0);
420 * Perform command substitution.
423 expbackq(union node *cmd, int quoted, int flag)
429 char *dest = expdest;
430 struct ifsregion saveifs, *savelastp;
431 struct nodelist *saveargbackq;
433 int startloc = dest - stackblock();
434 char const *syntax = quoted? DQSYNTAX : BASESYNTAX;
435 int quotes = flag & (EXP_FULL | EXP_CASE);
440 savelastp = ifslastp;
441 saveargbackq = argbackq;
442 p = grabstackstr(dest);
443 evalbackcmd(cmd, &in);
444 ungrabstackstr(p, dest);
446 ifslastp = savelastp;
447 argbackq = saveargbackq;
452 /* Don't copy trailing newlines */
454 if (--in.nleft < 0) {
457 while ((i = read(in.fd, buf, sizeof buf)) < 0 && errno == EINTR);
458 TRACE(("expbackq: read returns %d\n", i));
469 CHECKSTRSPACE(nnl + 2, dest);
474 if (quotes && syntax[(int)lastc] == CCTL)
475 USTPUTC(CTLESC, dest);
476 USTPUTC(lastc, dest);
486 exitstatus = waitforjob(in.jp, (int *)NULL);
488 recordregion(startloc, dest - stackblock(), 0);
489 TRACE(("expbackq: size=%td: \"%.*s\"\n",
490 ((dest - stackblock()) - startloc),
491 (int)((dest - stackblock()) - startloc),
492 stackblock() + startloc));
500 subevalvar(char *p, char *str, int strloc, int subtype, int startloc,
501 int varflags, int quotes)
507 struct nodelist *saveargbackq = argbackq;
510 argstr(p, (subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX ||
511 subtype == VSTRIMRIGHT || subtype == VSTRIMRIGHTMAX ?
512 EXP_CASE : 0) | EXP_TILDE);
513 STACKSTRNUL(expdest);
514 argbackq = saveargbackq;
515 startp = stackblock() + startloc;
517 str = stackblock() + strloc;
521 setvar(str, startp, 0);
522 amount = startp - expdest;
523 STADJUST(amount, expdest);
528 if (*p != CTLENDVAR) {
529 outfmt(out2, "%s\n", startp);
532 error("%.*s: parameter %snot set", (int)(p - str - 1),
533 str, (varflags & VSNUL) ? "null or "
538 for (loc = startp; loc < str; loc++) {
541 if (patmatch(str, startp, quotes)) {
546 if (quotes && *loc == CTLESC)
552 for (loc = str - 1; loc >= startp;) {
555 if (patmatch(str, startp, quotes)) {
561 if (quotes && loc > startp && *(loc - 1) == CTLESC) {
562 for (q = startp; q < loc; q++)
572 for (loc = str - 1; loc >= startp;) {
573 if (patmatch(str, loc, quotes)) {
574 amount = loc - expdest;
575 STADJUST(amount, expdest);
579 if (quotes && loc > startp && *(loc - 1) == CTLESC) {
580 for (q = startp; q < loc; q++)
590 for (loc = startp; loc < str - 1; loc++) {
591 if (patmatch(str, loc, quotes)) {
592 amount = loc - expdest;
593 STADJUST(amount, expdest);
596 if (quotes && *loc == CTLESC)
607 amount = ((str - 1) - (loc - startp)) - expdest;
608 STADJUST(amount, expdest);
609 while (loc != str - 1)
616 * Expand a variable, and return a pointer to the next character in the
621 evalvar(char *p, int flag)
635 int quotes = flag & (EXP_FULL | EXP_CASE);
637 varflags = (unsigned char)*p++;
638 subtype = varflags & VSTYPE;
643 p = strchr(p, '=') + 1;
644 again: /* jump here after setting a variable with ${var=text} */
645 if (varflags & VSLINENO) {
649 } else if (special) {
650 set = varisset(var, varflags & VSNUL);
653 val = bltinlookup(var, 1);
654 if (val == NULL || ((varflags & VSNUL) && val[0] == '\0')) {
661 startloc = expdest - stackblock();
662 if (!set && uflag && *var != '@' && *var != '*') {
670 error("%.*s: parameter not set", (int)(p - var - 1),
674 if (set && subtype != VSPLUS) {
675 /* insert the value of the variable */
677 if (varflags & VSLINENO)
678 STPUTBIN(var, p - var - 1, expdest);
680 varvalue(var, varflags & VSQUOTE, subtype, flag);
681 if (subtype == VSLENGTH) {
682 varlenb = expdest - stackblock() - startloc;
685 val = stackblock() + startloc;
686 for (;val != expdest; val++)
687 if ((*val & 0xC0) == 0x80)
690 STADJUST(-varlenb, expdest);
693 char const *syntax = (varflags & VSQUOTE) ? DQSYNTAX
696 if (subtype == VSLENGTH) {
699 (*val & 0xC0) != 0x80)
704 STPUTS_QUOTES(val, syntax, expdest);
706 STPUTS(val, expdest);
712 if (subtype == VSPLUS)
715 easy = ((varflags & VSQUOTE) == 0 ||
716 (*var == '@' && shellparam.nparam != 1));
721 expdest = cvtnum(varlen, expdest);
728 recordregion(startloc, expdest - stackblock(),
729 varflags & VSQUOTE || (ifsset() && ifsval()[0] == '\0' &&
730 (*var == '@' || *var == '*')));
736 argstr(p, flag | (flag & EXP_FULL ? EXP_SPLIT_LIT : 0) |
737 (varflags & VSQUOTE ? EXP_LIT_QUOTED : 0));
751 * Terminate the string and start recording the pattern
754 STPUTC('\0', expdest);
755 patloc = expdest - stackblock();
756 if (subevalvar(p, NULL, patloc, subtype,
757 startloc, varflags, quotes) == 0) {
758 int amount = (expdest - stackblock() - patloc) + 1;
759 STADJUST(-amount, expdest);
761 /* Remove any recorded regions beyond start of variable */
762 removerecordregions(startloc);
768 if (subevalvar(p, var, 0, subtype, startloc, varflags,
772 * Remove any recorded regions beyond
775 removerecordregions(startloc);
786 error("${%.*s%s}: Bad substitution", c, var,
787 (c > 0 && *p != CTLENDVAR) ? "..." : "");
793 if (subtype != VSNORMAL) { /* skip to end of alternative */
796 if ((c = *p++) == CTLESC)
798 else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) {
800 argbackq = argbackq->next;
801 } else if (c == CTLVAR) {
802 if ((*p++ & VSTYPE) != VSNORMAL)
804 } else if (c == CTLENDVAR) {
816 * Test whether a specialized variable is set.
820 varisset(const char *name, int nulok)
824 return backgndpidset();
825 else if (*name == '@' || *name == '*') {
826 if (*shellparam.p == NULL)
832 for (av = shellparam.p; *av; av++)
837 } else if (is_digit(*name)) {
842 num = strtol(name, NULL, 10);
843 if (errno != 0 || num > shellparam.nparam)
849 ap = shellparam.p[num - 1];
851 if (nulok && (ap == NULL || *ap == '\0'))
858 strtodest(const char *p, int flag, int subtype, int quoted)
860 if (flag & (EXP_FULL | EXP_CASE) && subtype != VSLENGTH)
861 STPUTS_QUOTES(p, quoted ? DQSYNTAX : BASESYNTAX, expdest);
867 * Add the value of a specialized variable to the stack string.
871 varvalue(const char *name, int quoted, int subtype, int flag)
887 num = shellparam.nparam;
890 num = backgndpidval();
892 expdest = cvtnum(num, expdest);
895 for (i = 0 ; i < NOPTS ; i++) {
897 STPUTC(optlist[i].letter, expdest);
901 if (flag & EXP_FULL && quoted) {
902 for (ap = shellparam.p ; (p = *ap++) != NULL ; ) {
903 strtodest(p, flag, subtype, quoted);
905 STPUTC('\0', expdest);
915 for (ap = shellparam.p ; (p = *ap++) != NULL ; ) {
916 strtodest(p, flag, subtype, quoted);
919 if (sep || (flag & EXP_FULL && !quoted && **ap != '\0'))
920 STPUTC(sep, expdest);
925 strtodest(p, flag, subtype, quoted);
928 if (is_digit(*name)) {
930 if (num > 0 && num <= shellparam.nparam) {
931 p = shellparam.p[num - 1];
932 strtodest(p, flag, subtype, quoted);
942 * Record the fact that we have to scan this region of the
943 * string for IFS characters.
947 recordregion(int start, int end, int inquotes)
949 struct ifsregion *ifsp;
952 if (ifslastp == NULL) {
955 if (ifslastp->endoff == start
956 && ifslastp->inquotes == inquotes) {
957 /* extend previous area */
958 ifslastp->endoff = end;
962 ifsp = (struct ifsregion *)ckmalloc(sizeof (struct ifsregion));
963 ifslastp->next = ifsp;
966 ifslastp->next = NULL;
967 ifslastp->begoff = start;
968 ifslastp->endoff = end;
969 ifslastp->inquotes = inquotes;
976 * Break the argument string into pieces based upon IFS and add the
977 * strings to the argument list. The regions of the string to be
978 * searched for IFS characters have been stored by recordregion.
979 * CTLESC characters are preserved but have little effect in this pass
980 * other than escaping CTL* characters. In particular, they do not escape
981 * IFS characters: that should be done with the ifsregion mechanism.
982 * CTLQUOTEMARK characters are used to preserve empty quoted strings.
983 * This pass treats them as a regular character, making the string non-empty.
984 * Later, they are removed along with the other CTL* characters.
987 ifsbreakup(char *string, struct arglist *arglist)
989 struct ifsregion *ifsp;
996 int had_param_ch = 0;
1000 if (ifslastp == NULL) {
1001 /* Return entire argument, IFS doesn't apply to any of it */
1002 sp = (struct strlist *)stalloc(sizeof *sp);
1004 *arglist->lastp = sp;
1005 arglist->lastp = &sp->next;
1009 ifs = ifsset() ? ifsval() : " \t\n";
1011 for (ifsp = &ifsfirst; ifsp != NULL; ifsp = ifsp->next) {
1012 p = string + ifsp->begoff;
1013 while (p < string + ifsp->endoff) {
1017 if (ifsp->inquotes) {
1018 /* Only NULs (should be from "$@") end args */
1026 if (!strchr(ifs, *p)) {
1031 ifsspc = strchr(" \t\n", *p);
1033 /* Ignore IFS whitespace at start */
1034 if (q == start && ifsspc != NULL) {
1042 /* Save this argument... */
1044 sp = (struct strlist *)stalloc(sizeof *sp);
1046 *arglist->lastp = sp;
1047 arglist->lastp = &sp->next;
1050 if (ifsspc != NULL) {
1051 /* Ignore further trailing IFS whitespace */
1052 for (; p < string + ifsp->endoff; p++) {
1056 if (strchr(ifs, *p) == NULL) {
1060 if (strchr(" \t\n", *p) == NULL) {
1071 * Save anything left as an argument.
1072 * Traditionally we have treated 'IFS=':'; set -- x$IFS' as
1073 * generating 2 arguments, the second of which is empty.
1074 * Some recent clarification of the Posix spec say that it
1075 * should only generate one....
1077 if (had_param_ch || *start != 0) {
1078 sp = (struct strlist *)stalloc(sizeof *sp);
1080 *arglist->lastp = sp;
1081 arglist->lastp = &sp->next;
1086 static char expdir[PATH_MAX];
1087 #define expdir_end (expdir + sizeof(expdir))
1090 * Perform pathname generation and remove control characters.
1091 * At this point, the only control characters should be CTLESC and CTLQUOTEMARK.
1092 * The results are stored in the list exparg.
1095 expandmeta(struct strlist *str, int flag __unused)
1098 struct strlist **savelastp;
1106 for (;;) { /* fast check for meta chars */
1107 if ((c = *p++) == '\0')
1109 if (c == '*' || c == '?' || c == '[')
1112 savelastp = exparg.lastp;
1114 expmeta(expdir, str->text);
1116 if (exparg.lastp == savelastp) {
1121 *exparg.lastp = str;
1122 rmescapes(str->text);
1123 exparg.lastp = &str->next;
1125 *exparg.lastp = NULL;
1126 *savelastp = sp = expsort(*savelastp);
1127 while (sp->next != NULL)
1129 exparg.lastp = &sp->next;
1137 * Do metacharacter (i.e. *, ?, [...]) expansion.
1141 expmeta(char *enddir, char *name)
1158 for (p = name; esc = 0, *p; p += esc + 1) {
1159 if (*p == '*' || *p == '?')
1161 else if (*p == '[') {
1163 if (*q == '!' || *q == '^')
1166 while (*q == CTLQUOTEMARK)
1170 if (*q == '/' || *q == '\0')
1177 } else if (*p == '\0')
1179 else if (*p == CTLQUOTEMARK)
1184 if (p[esc] == '/') {
1187 start = p + esc + 1;
1191 if (metaflag == 0) { /* we've reached the end of the file name */
1192 if (enddir != expdir)
1194 for (p = name ; ; p++) {
1195 if (*p == CTLQUOTEMARK)
1202 if (enddir == expdir_end)
1205 if (metaflag == 0 || lstat(expdir, &statb) >= 0)
1209 endname = name + (p - name);
1210 if (start != name) {
1213 while (*p == CTLQUOTEMARK)
1218 if (enddir == expdir_end)
1222 if (enddir == expdir) {
1224 } else if (enddir == expdir + 1 && *expdir == '/') {
1230 if ((dirp = opendir(p)) == NULL)
1232 if (enddir != expdir)
1234 if (*endname == 0) {
1243 while (*p == CTLQUOTEMARK)
1249 while (! int_pending() && (dp = readdir(dirp)) != NULL) {
1250 if (dp->d_name[0] == '.' && ! matchdot)
1252 if (patmatch(start, dp->d_name, 0)) {
1253 namlen = dp->d_namlen;
1254 if (enddir + namlen + 1 > expdir_end)
1256 memcpy(enddir, dp->d_name, namlen + 1);
1260 if (dp->d_type != DT_UNKNOWN &&
1261 dp->d_type != DT_DIR &&
1262 dp->d_type != DT_LNK)
1264 if (enddir + namlen + 2 > expdir_end)
1266 enddir[namlen] = '/';
1267 enddir[namlen + 1] = '\0';
1268 expmeta(enddir + namlen + 1, endname);
1274 endname[-esc - 1] = esc ? CTLESC : '/';
1279 * Add a file name to the list.
1283 addfname(char *name)
1290 p = stalloc(len + 1);
1291 memcpy(p, name, len + 1);
1292 sp = (struct strlist *)stalloc(sizeof *sp);
1295 exparg.lastp = &sp->next;
1300 * Sort the results of file name expansion. It calculates the number of
1301 * strings to sort and then calls msort (short for merge sort) to do the
1305 static struct strlist *
1306 expsort(struct strlist *str)
1312 for (sp = str ; sp ; sp = sp->next)
1314 return msort(str, len);
1318 static struct strlist *
1319 msort(struct strlist *list, int len)
1321 struct strlist *p, *q = NULL;
1322 struct strlist **lpp;
1330 for (n = half ; --n >= 0 ; ) {
1334 q->next = NULL; /* terminate first half of list */
1335 q = msort(list, half); /* sort first half of list */
1336 p = msort(p, len - half); /* sort second half */
1339 if (strcmp(p->text, q->text) < 0) {
1342 if ((p = *lpp) == NULL) {
1349 if ((q = *lpp) == NULL) {
1361 get_wc(const char **p)
1366 chrlen = mbtowc(&c, *p, 4);
1369 else if (chrlen == -1)
1378 * See if a character matches a character class, starting at the first colon
1380 * If a valid character class is recognized, a pointer to the next character
1381 * after the final closing bracket is stored into *end, otherwise a null
1382 * pointer is stored into *end.
1385 match_charclass(const char *p, wchar_t chr, const char **end)
1388 const char *nameend;
1393 nameend = strstr(p, ":]");
1394 if (nameend == NULL || (size_t)(nameend - p) >= sizeof(name) ||
1397 memcpy(name, p, nameend - p);
1398 name[nameend - p] = '\0';
1400 cclass = wctype(name);
1401 /* An unknown class matches nothing but is valid nevertheless. */
1404 return iswctype(chr, cclass);
1409 * Returns true if the pattern matches the string.
1413 patmatch(const char *pattern, const char *string, int squoted)
1415 const char *p, *q, *end;
1416 const char *bt_p, *bt_q;
1431 if (squoted && *q == CTLESC)
1439 if (squoted && *q == CTLESC)
1446 * A '?' does not match invalid UTF-8 but a
1447 * '*' does, so backtrack.
1452 wc = (unsigned char)*q++;
1456 while (c == CTLQUOTEMARK || c == '*')
1459 * If the pattern ends here, we know the string
1460 * matches without needing to look at the rest of it.
1465 * First try the shortest match for the '*' that
1466 * could work. We can forget any earlier '*' since
1467 * there is no way having it match more characters
1468 * can help us, given that we are already here.
1479 if (*endp == '!' || *endp == '^')
1482 while (*endp == CTLQUOTEMARK)
1485 goto dft; /* no matching ] */
1486 if (*endp == CTLESC)
1492 if (*p == '!' || *p == '^') {
1497 if (squoted && *q == CTLESC)
1506 chr = (unsigned char)*q++;
1509 if (c == CTLQUOTEMARK)
1511 if (c == '[' && *p == ':') {
1512 found |= match_charclass(p, chr, &end);
1518 if (localeisutf8 && c & 0x80) {
1521 if (wc == 0) /* bad utf-8 */
1524 wc = (unsigned char)c;
1525 if (*p == '-' && p[1] != ']') {
1527 while (*p == CTLQUOTEMARK)
1533 if (wc2 == 0) /* bad utf-8 */
1536 wc2 = (unsigned char)*p++;
1537 if ( collate_range_cmp(chr, wc) >= 0
1538 && collate_range_cmp(chr, wc2) <= 0
1545 } while ((c = *p++) != ']');
1546 if (found == invert)
1551 if (squoted && *q == CTLESC)
1559 * If we have a mismatch (other than hitting the end
1560 * of the string), go back to the last '*' seen and
1561 * have it match one additional character.
1565 if (squoted && *bt_q == CTLESC)
1580 * Remove any CTLESC and CTLQUOTEMARK characters from a string.
1584 rmescapes(char *str)
1589 while (*p != CTLESC && *p != CTLQUOTEMARK && *p != CTLQUOTEEND) {
1595 if (*p == CTLQUOTEMARK || *p == CTLQUOTEEND) {
1609 * See if a pattern matches in a case statement.
1613 casematch(union node *pattern, const char *val)
1615 struct stackmark smark;
1619 setstackmark(&smark);
1620 argbackq = pattern->narg.backquote;
1621 STARTSTACKSTR(expdest);
1623 argstr(pattern->narg.text, EXP_TILDE | EXP_CASE);
1624 STPUTC('\0', expdest);
1625 p = grabstackstr(expdest);
1626 result = patmatch(p, val, 0);
1627 popstackmark(&smark);
1636 cvtnum(int num, char *buf)
1640 char *p = temp + 31;
1645 *--p = num % 10 + '0';
1646 } while ((num /= 10) != 0);
1656 * Do most of the work for wordexp(3).
1660 wordexpcmd(int argc, char **argv)
1665 out1fmt("%08x", argc - 1);
1666 for (i = 1, len = 0; i < argc; i++)
1667 len += strlen(argv[i]);
1668 out1fmt("%08x", (int)len);
1669 for (i = 1; i < argc; i++)
1670 outbin(argv[i], strlen(argv[i]) + 1, out1);