sh: Cache de->d_namlen in a local variable.
[dragonfly.git] / bin / sh / expand.c
1 /*-
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.
6  *
7  * This code is derived from software contributed to Berkeley by
8  * Kenneth Almquist.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
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  * 3. All advertising materials mentioning features or use of this software
19  *    must display the following acknowledgement:
20  *      This product includes software developed by the University of
21  *      California, Berkeley and its contributors.
22  * 4. Neither the name of the University nor the names of its contributors
23  *    may be used to endorse or promote products derived from this software
24  *    without specific prior written permission.
25  *
26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36  * SUCH DAMAGE.
37  *
38  * @(#)expand.c 8.5 (Berkeley) 5/15/95
39  * $FreeBSD: src/bin/sh/expand.c,v 1.92 2011/12/28 23:30:17 jilles Exp $
40  */
41
42 #include <sys/types.h>
43 #include <sys/time.h>
44 #include <sys/stat.h>
45 #include <dirent.h>
46 #include <errno.h>
47 #include <inttypes.h>
48 #include <limits.h>
49 #include <pwd.h>
50 #include <stdio.h>
51 #include <stdlib.h>
52 #include <string.h>
53 #include <unistd.h>
54 #include <wchar.h>
55 #include <wctype.h>
56
57 /*
58  * Routines to expand arguments to commands.  We have to deal with
59  * backquotes, shell variables, and file metacharacters.
60  */
61
62 #include "shell.h"
63 #include "main.h"
64 #include "nodes.h"
65 #include "eval.h"
66 #include "expand.h"
67 #include "syntax.h"
68 #include "parser.h"
69 #include "jobs.h"
70 #include "options.h"
71 #include "var.h"
72 #include "input.h"
73 #include "output.h"
74 #include "memalloc.h"
75 #include "error.h"
76 #include "mystring.h"
77 #include "arith.h"
78 #include "show.h"
79 #include "builtins.h"
80
81 /*
82  * Structure specifying which parts of the string should be searched
83  * for IFS characters.
84  */
85
86 struct ifsregion {
87         struct ifsregion *next; /* next region in list */
88         int begoff;             /* offset of start of region */
89         int endoff;             /* offset of end of region */
90         int inquotes;           /* search for nul bytes only */
91 };
92
93
94 static char *expdest;                   /* output of current string */
95 static struct nodelist *argbackq;       /* list of back quote expressions */
96 static struct ifsregion ifsfirst;       /* first struct in list of ifs regions */
97 static struct ifsregion *ifslastp;      /* last struct in list */
98 static struct arglist exparg;           /* holds expanded arg list */
99
100 static void argstr(char *, int);
101 static char *exptilde(char *, int);
102 static void expbackq(union node *, int, int);
103 static int subevalvar(char *, char *, int, int, int, int, int);
104 static char *evalvar(char *, int);
105 static int varisset(char *, int);
106 static void varvalue(char *, int, int, int);
107 static void recordregion(int, int, int);
108 static void removerecordregions(int);
109 static void ifsbreakup(char *, struct arglist *);
110 static void expandmeta(struct strlist *, int);
111 static void expmeta(char *, char *);
112 static void addfname(char *);
113 static struct strlist *expsort(struct strlist *);
114 static struct strlist *msort(struct strlist *, int);
115 static char *cvtnum(int, char *);
116 static int collate_range_cmp(wchar_t, wchar_t);
117
118 static int
119 collate_range_cmp(wchar_t c1, wchar_t c2)
120 {
121         static wchar_t s1[2], s2[2];
122
123         s1[0] = c1;
124         s2[0] = c2;
125         return (wcscoll(s1, s2));
126 }
127
128 /*
129  * Expand shell variables and backquotes inside a here document.
130  *      union node *arg         the document
131  *      int fd;                 where to write the expanded version
132  */
133
134 void
135 expandhere(union node *arg, int fd)
136 {
137         expandarg(arg, NULL, 0);
138         xwrite(fd, stackblock(), expdest - stackblock());
139 }
140
141 static char *
142 stputs_quotes(const char *data, const char *syntax, char *p)
143 {
144         while (*data) {
145                 CHECKSTRSPACE(2, p);
146                 if (syntax[(int)*data] == CCTL)
147                         USTPUTC(CTLESC, p);
148                 USTPUTC(*data++, p);
149         }
150         return (p);
151 }
152 #define STPUTS_QUOTES(data, syntax, p) p = stputs_quotes((data), syntax, p)
153
154 /*
155  * Perform expansions on an argument, placing the resulting list of arguments
156  * in arglist.  Parameter expansion, command substitution and arithmetic
157  * expansion are always performed; additional expansions can be requested
158  * via flag (EXP_*).
159  * The result is left in the stack string.
160  * When arglist is NULL, perform here document expansion.
161  *
162  * Caution: this function uses global state and is not reentrant.
163  * However, a new invocation after an interrupted invocation is safe
164  * and will reset the global state for the new call.
165  */
166 void
167 expandarg(union node *arg, struct arglist *arglist, int flag)
168 {
169         struct strlist *sp;
170         char *p;
171
172         argbackq = arg->narg.backquote;
173         STARTSTACKSTR(expdest);
174         ifsfirst.next = NULL;
175         ifslastp = NULL;
176         argstr(arg->narg.text, flag);
177         if (arglist == NULL) {
178                 STACKSTRNUL(expdest);
179                 return;                 /* here document expanded */
180         }
181         STPUTC('\0', expdest);
182         p = grabstackstr(expdest);
183         exparg.lastp = &exparg.list;
184         /*
185          * TODO - EXP_REDIR
186          */
187         if (flag & EXP_FULL) {
188                 ifsbreakup(p, &exparg);
189                 *exparg.lastp = NULL;
190                 exparg.lastp = &exparg.list;
191                 expandmeta(exparg.list, flag);
192         } else {
193                 if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */
194                         rmescapes(p);
195                 sp = (struct strlist *)stalloc(sizeof (struct strlist));
196                 sp->text = p;
197                 *exparg.lastp = sp;
198                 exparg.lastp = &sp->next;
199         }
200         while (ifsfirst.next != NULL) {
201                 struct ifsregion *ifsp;
202                 INTOFF;
203                 ifsp = ifsfirst.next->next;
204                 ckfree(ifsfirst.next);
205                 ifsfirst.next = ifsp;
206                 INTON;
207         }
208         *exparg.lastp = NULL;
209         if (exparg.list) {
210                 *arglist->lastp = exparg.list;
211                 arglist->lastp = exparg.lastp;
212         }
213 }
214
215
216
217 /*
218  * Perform parameter expansion, command substitution and arithmetic
219  * expansion, and tilde expansion if requested via EXP_TILDE/EXP_VARTILDE.
220  * Processing ends at a CTLENDVAR character as well as '\0'.
221  * This is used to expand word in ${var+word} etc.
222  * If EXP_FULL, EXP_CASE or EXP_REDIR are set, keep and/or generate CTLESC
223  * characters to allow for further processing.
224  * If EXP_FULL is set, also preserve CTLQUOTEMARK characters.
225  */
226 static void
227 argstr(char *p, int flag)
228 {
229         char c;
230         int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR);  /* do CTLESC */
231         int firsteq = 1;
232         int split_lit;
233         int lit_quoted;
234
235         split_lit = flag & EXP_SPLIT_LIT;
236         lit_quoted = flag & EXP_LIT_QUOTED;
237         flag &= ~(EXP_SPLIT_LIT | EXP_LIT_QUOTED);
238         if (*p == '~' && (flag & (EXP_TILDE | EXP_VARTILDE)))
239                 p = exptilde(p, flag);
240         for (;;) {
241                 CHECKSTRSPACE(2, expdest);
242                 switch (c = *p++) {
243                 case '\0':
244                 case CTLENDVAR:
245                         goto breakloop;
246                 case CTLQUOTEMARK:
247                         lit_quoted = 1;
248                         /* "$@" syntax adherence hack */
249                         if (p[0] == CTLVAR && p[2] == '@' && p[3] == '=')
250                                 break;
251                         if ((flag & EXP_FULL) != 0)
252                                 USTPUTC(c, expdest);
253                         break;
254                 case CTLQUOTEEND:
255                         lit_quoted = 0;
256                         break;
257                 case CTLESC:
258                         if (quotes)
259                                 USTPUTC(c, expdest);
260                         c = *p++;
261                         USTPUTC(c, expdest);
262                         if (split_lit && !lit_quoted)
263                                 recordregion(expdest - stackblock() -
264                                     (quotes ? 2 : 1),
265                                     expdest - stackblock(), 0);
266                         break;
267                 case CTLVAR:
268                         p = evalvar(p, flag);
269                         break;
270                 case CTLBACKQ:
271                 case CTLBACKQ|CTLQUOTE:
272                         expbackq(argbackq->n, c & CTLQUOTE, flag);
273                         argbackq = argbackq->next;
274                         break;
275                 case CTLENDARI:
276                         expari(flag);
277                         break;
278                 case ':':
279                 case '=':
280                         /*
281                          * sort of a hack - expand tildes in variable
282                          * assignments (after the first '=' and after ':'s).
283                          */
284                         USTPUTC(c, expdest);
285                         if (split_lit && !lit_quoted)
286                                 recordregion(expdest - stackblock() - 1,
287                                     expdest - stackblock(), 0);
288                         if (flag & EXP_VARTILDE && *p == '~' &&
289                             (c != '=' || firsteq)) {
290                                 if (c == '=')
291                                         firsteq = 0;
292                                 p = exptilde(p, flag);
293                         }
294                         break;
295                 default:
296                         USTPUTC(c, expdest);
297                         if (split_lit && !lit_quoted)
298                                 recordregion(expdest - stackblock() - 1,
299                                     expdest - stackblock(), 0);
300                 }
301         }
302 breakloop:;
303 }
304
305 /*
306  * Perform tilde expansion, placing the result in the stack string and
307  * returning the next position in the input string to process.
308  */
309 static char *
310 exptilde(char *p, int flag)
311 {
312         char c, *startp = p;
313         struct passwd *pw;
314         char *home;
315         int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR);
316
317         while ((c = *p) != '\0') {
318                 switch(c) {
319                 case CTLESC: /* This means CTL* are always considered quoted. */
320                 case CTLVAR:
321                 case CTLBACKQ:
322                 case CTLBACKQ | CTLQUOTE:
323                 case CTLARI:
324                 case CTLENDARI:
325                 case CTLQUOTEMARK:
326                         return (startp);
327                 case ':':
328                         if (flag & EXP_VARTILDE)
329                                 goto done;
330                         break;
331                 case '/':
332                 case CTLENDVAR:
333                         goto done;
334                 }
335                 p++;
336         }
337 done:
338         *p = '\0';
339         if (*(startp+1) == '\0') {
340                 if ((home = lookupvar("HOME")) == NULL)
341                         goto lose;
342         } else {
343                 if ((pw = getpwnam(startp+1)) == NULL)
344                         goto lose;
345                 home = pw->pw_dir;
346         }
347         if (*home == '\0')
348                 goto lose;
349         *p = c;
350         if (quotes)
351                 STPUTS_QUOTES(home, SQSYNTAX, expdest);
352         else
353                 STPUTS(home, expdest);
354         return (p);
355 lose:
356         *p = c;
357         return (startp);
358 }
359
360
361 static void
362 removerecordregions(int endoff)
363 {
364         if (ifslastp == NULL)
365                 return;
366
367         if (ifsfirst.endoff > endoff) {
368                 while (ifsfirst.next != NULL) {
369                         struct ifsregion *ifsp;
370                         INTOFF;
371                         ifsp = ifsfirst.next->next;
372                         ckfree(ifsfirst.next);
373                         ifsfirst.next = ifsp;
374                         INTON;
375                 }
376                 if (ifsfirst.begoff > endoff)
377                         ifslastp = NULL;
378                 else {
379                         ifslastp = &ifsfirst;
380                         ifsfirst.endoff = endoff;
381                 }
382                 return;
383         }
384
385         ifslastp = &ifsfirst;
386         while (ifslastp->next && ifslastp->next->begoff < endoff)
387                 ifslastp=ifslastp->next;
388         while (ifslastp->next != NULL) {
389                 struct ifsregion *ifsp;
390                 INTOFF;
391                 ifsp = ifslastp->next->next;
392                 ckfree(ifslastp->next);
393                 ifslastp->next = ifsp;
394                 INTON;
395         }
396         if (ifslastp->endoff > endoff)
397                 ifslastp->endoff = endoff;
398 }
399
400 /*
401  * Expand arithmetic expression.  Backup to start of expression,
402  * evaluate, place result in (backed up) result, adjust string position.
403  */
404 void
405 expari(int flag)
406 {
407         char *p, *q, *start;
408         arith_t result;
409         int begoff;
410         int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR);
411         int quoted;
412
413         /*
414          * This routine is slightly over-complicated for
415          * efficiency.  First we make sure there is
416          * enough space for the result, which may be bigger
417          * than the expression.  Next we
418          * scan backwards looking for the start of arithmetic.  If the
419          * next previous character is a CTLESC character, then we
420          * have to rescan starting from the beginning since CTLESC
421          * characters have to be processed left to right.
422          */
423         CHECKSTRSPACE(DIGITS(result) - 2, expdest);
424         USTPUTC('\0', expdest);
425         start = stackblock();
426         p = expdest - 2;
427         while (p >= start && *p != CTLARI)
428                 --p;
429         if (p < start || *p != CTLARI)
430                 error("missing CTLARI (shouldn't happen)");
431         if (p > start && *(p - 1) == CTLESC)
432                 for (p = start; *p != CTLARI; p++)
433                         if (*p == CTLESC)
434                                 p++;
435
436         if (p[1] == '"')
437                 quoted=1;
438         else
439                 quoted=0;
440         begoff = p - start;
441         removerecordregions(begoff);
442         if (quotes)
443                 rmescapes(p+2);
444         q = grabstackstr(expdest);
445         result = arith(p+2);
446         ungrabstackstr(q, expdest);
447         fmtstr(p, DIGITS(result), ARITH_FORMAT_STR, result);
448         while (*p++)
449                 ;
450         if (quoted == 0)
451                 recordregion(begoff, p - 1 - start, 0);
452         result = expdest - p + 1;
453         STADJUST(-result, expdest);
454 }
455
456
457 /*
458  * Perform command substitution.
459  */
460 static void
461 expbackq(union node *cmd, int quoted, int flag)
462 {
463         struct backcmd in;
464         int i;
465         char buf[128];
466         char *p;
467         char *dest = expdest;
468         struct ifsregion saveifs, *savelastp;
469         struct nodelist *saveargbackq;
470         char lastc;
471         int startloc = dest - stackblock();
472         char const *syntax = quoted? DQSYNTAX : BASESYNTAX;
473         int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR);
474         int nnl;
475
476         INTOFF;
477         saveifs = ifsfirst;
478         savelastp = ifslastp;
479         saveargbackq = argbackq;
480         p = grabstackstr(dest);
481         evalbackcmd(cmd, &in);
482         ungrabstackstr(p, dest);
483         ifsfirst = saveifs;
484         ifslastp = savelastp;
485         argbackq = saveargbackq;
486
487         p = in.buf;
488         lastc = '\0';
489         nnl = 0;
490         /* Don't copy trailing newlines */
491         for (;;) {
492                 if (--in.nleft < 0) {
493                         if (in.fd < 0)
494                                 break;
495                         while ((i = read(in.fd, buf, sizeof buf)) < 0 && errno == EINTR);
496                         TRACE(("expbackq: read returns %d\n", i));
497                         if (i <= 0)
498                                 break;
499                         p = buf;
500                         in.nleft = i - 1;
501                 }
502                 lastc = *p++;
503                 if (lastc != '\0') {
504                         if (lastc == '\n') {
505                                 nnl++;
506                         } else {
507                                 CHECKSTRSPACE(nnl + 2, dest);
508                                 while (nnl > 0) {
509                                         nnl--;
510                                         USTPUTC('\n', dest);
511                                 }
512                                 if (quotes && syntax[(int)lastc] == CCTL)
513                                         USTPUTC(CTLESC, dest);
514                                 USTPUTC(lastc, dest);
515                         }
516                 }
517         }
518
519         if (in.fd >= 0)
520                 close(in.fd);
521         if (in.buf)
522                 ckfree(in.buf);
523         if (in.jp)
524                 exitstatus = waitforjob(in.jp, NULL);
525         if (quoted == 0)
526                 recordregion(startloc, dest - stackblock(), 0);
527         TRACE(("expbackq: size=%td: \"%.*s\"\n",
528                 ((dest - stackblock()) - startloc),
529                 (int)((dest - stackblock()) - startloc),
530                 stackblock() + startloc));
531         expdest = dest;
532         INTON;
533 }
534
535
536
537 static int
538 subevalvar(char *p, char *str, int strloc, int subtype, int startloc,
539   int varflags, int quotes)
540 {
541         char *startp;
542         char *loc = NULL;
543         char *q;
544         int c = 0;
545         struct nodelist *saveargbackq = argbackq;
546         int amount;
547
548         argstr(p, (subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX ||
549             subtype == VSTRIMRIGHT || subtype == VSTRIMRIGHTMAX ?
550             EXP_CASE : 0) | EXP_TILDE);
551         STACKSTRNUL(expdest);
552         argbackq = saveargbackq;
553         startp = stackblock() + startloc;
554         if (str == NULL)
555             str = stackblock() + strloc;
556
557         switch (subtype) {
558         case VSASSIGN:
559                 setvar(str, startp, 0);
560                 amount = startp - expdest;
561                 STADJUST(amount, expdest);
562                 varflags &= ~VSNUL;
563                 return 1;
564
565         case VSQUESTION:
566                 if (*p != CTLENDVAR) {
567                         outfmt(out2, "%s\n", startp);
568                         error(NULL);
569                 }
570                 error("%.*s: parameter %snot set", (int)(p - str - 1),
571                       str, (varflags & VSNUL) ? "null or "
572                                               : nullstr);
573                 return 0;
574
575         case VSTRIMLEFT:
576                 for (loc = startp; loc < str; loc++) {
577                         c = *loc;
578                         *loc = '\0';
579                         if (patmatch(str, startp, quotes)) {
580                                 *loc = c;
581                                 goto recordleft;
582                         }
583                         *loc = c;
584                         if (quotes && *loc == CTLESC)
585                                 loc++;
586                 }
587                 return 0;
588
589         case VSTRIMLEFTMAX:
590                 for (loc = str - 1; loc >= startp;) {
591                         c = *loc;
592                         *loc = '\0';
593                         if (patmatch(str, startp, quotes)) {
594                                 *loc = c;
595                                 goto recordleft;
596                         }
597                         *loc = c;
598                         loc--;
599                         if (quotes && loc > startp && *(loc - 1) == CTLESC) {
600                                 for (q = startp; q < loc; q++)
601                                         if (*q == CTLESC)
602                                                 q++;
603                                 if (q > loc)
604                                         loc--;
605                         }
606                 }
607                 return 0;
608
609         case VSTRIMRIGHT:
610                 for (loc = str - 1; loc >= startp;) {
611                         if (patmatch(str, loc, quotes)) {
612                                 amount = loc - expdest;
613                                 STADJUST(amount, expdest);
614                                 return 1;
615                         }
616                         loc--;
617                         if (quotes && loc > startp && *(loc - 1) == CTLESC) {
618                                 for (q = startp; q < loc; q++)
619                                         if (*q == CTLESC)
620                                                 q++;
621                                 if (q > loc)
622                                         loc--;
623                         }
624                 }
625                 return 0;
626
627         case VSTRIMRIGHTMAX:
628                 for (loc = startp; loc < str - 1; loc++) {
629                         if (patmatch(str, loc, quotes)) {
630                                 amount = loc - expdest;
631                                 STADJUST(amount, expdest);
632                                 return 1;
633                         }
634                         if (quotes && *loc == CTLESC)
635                                 loc++;
636                 }
637                 return 0;
638
639
640         default:
641                 abort();
642         }
643
644 recordleft:
645         amount = ((str - 1) - (loc - startp)) - expdest;
646         STADJUST(amount, expdest);
647         while (loc != str - 1)
648                 *startp++ = *loc++;
649         return 1;
650 }
651
652
653 /*
654  * Expand a variable, and return a pointer to the next character in the
655  * input string.
656  */
657
658 static char *
659 evalvar(char *p, int flag)
660 {
661         int subtype;
662         int varflags;
663         char *var;
664         char *val;
665         int patloc;
666         int c;
667         int set;
668         int special;
669         int startloc;
670         int varlen;
671         int varlenb;
672         int easy;
673         int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR);
674
675         varflags = (unsigned char)*p++;
676         subtype = varflags & VSTYPE;
677         var = p;
678         special = 0;
679         if (! is_name(*p))
680                 special = 1;
681         p = strchr(p, '=') + 1;
682 again: /* jump here after setting a variable with ${var=text} */
683         if (varflags & VSLINENO) {
684                 set = 1;
685                 special = 0;
686                 val = var;
687                 p[-1] = '\0';   /* temporarily overwrite '=' to have \0
688                                    terminated string */
689         } else if (special) {
690                 set = varisset(var, varflags & VSNUL);
691                 val = NULL;
692         } else {
693                 val = bltinlookup(var, 1);
694                 if (val == NULL || ((varflags & VSNUL) && val[0] == '\0')) {
695                         val = NULL;
696                         set = 0;
697                 } else
698                         set = 1;
699         }
700         varlen = 0;
701         startloc = expdest - stackblock();
702         if (!set && uflag && *var != '@' && *var != '*') {
703                 switch (subtype) {
704                 case VSNORMAL:
705                 case VSTRIMLEFT:
706                 case VSTRIMLEFTMAX:
707                 case VSTRIMRIGHT:
708                 case VSTRIMRIGHTMAX:
709                 case VSLENGTH:
710                         error("%.*s: parameter not set", (int)(p - var - 1),
711                             var);
712                 }
713         }
714         if (set && subtype != VSPLUS) {
715                 /* insert the value of the variable */
716                 if (special) {
717                         varvalue(var, varflags & VSQUOTE, subtype, flag);
718                         if (subtype == VSLENGTH) {
719                                 varlenb = expdest - stackblock() - startloc;
720                                 varlen = varlenb;
721                                 if (localeisutf8) {
722                                         val = stackblock() + startloc;
723                                         for (;val != expdest; val++)
724                                                 if ((*val & 0xC0) == 0x80)
725                                                         varlen--;
726                                 }
727                                 STADJUST(-varlenb, expdest);
728                         }
729                 } else {
730                         char const *syntax = (varflags & VSQUOTE) ? DQSYNTAX
731                                                                   : BASESYNTAX;
732
733                         if (subtype == VSLENGTH) {
734                                 for (;*val; val++)
735                                         if (!localeisutf8 ||
736                                             (*val & 0xC0) != 0x80)
737                                                 varlen++;
738                         }
739                         else {
740                                 if (quotes)
741                                         STPUTS_QUOTES(val, syntax, expdest);
742                                 else
743                                         STPUTS(val, expdest);
744
745                         }
746                 }
747         }
748
749         if (subtype == VSPLUS)
750                 set = ! set;
751
752         easy = ((varflags & VSQUOTE) == 0 ||
753                 (*var == '@' && shellparam.nparam != 1));
754
755
756         switch (subtype) {
757         case VSLENGTH:
758                 expdest = cvtnum(varlen, expdest);
759                 goto record;
760
761         case VSNORMAL:
762                 if (!easy)
763                         break;
764 record:
765                 recordregion(startloc, expdest - stackblock(),
766                     varflags & VSQUOTE || (ifsset() && ifsval()[0] == '\0' &&
767                     (*var == '@' || *var == '*')));
768                 break;
769
770         case VSPLUS:
771         case VSMINUS:
772                 if (!set) {
773                         argstr(p, flag | (flag & EXP_FULL ? EXP_SPLIT_LIT : 0) |
774                             (varflags & VSQUOTE ? EXP_LIT_QUOTED : 0));
775                         break;
776                 }
777                 if (easy)
778                         goto record;
779                 break;
780
781         case VSTRIMLEFT:
782         case VSTRIMLEFTMAX:
783         case VSTRIMRIGHT:
784         case VSTRIMRIGHTMAX:
785                 if (!set)
786                         break;
787                 /*
788                  * Terminate the string and start recording the pattern
789                  * right after it
790                  */
791                 STPUTC('\0', expdest);
792                 patloc = expdest - stackblock();
793                 if (subevalvar(p, NULL, patloc, subtype,
794                     startloc, varflags, quotes) == 0) {
795                         int amount = (expdest - stackblock() - patloc) + 1;
796                         STADJUST(-amount, expdest);
797                 }
798                 /* Remove any recorded regions beyond start of variable */
799                 removerecordregions(startloc);
800                 goto record;
801
802         case VSASSIGN:
803         case VSQUESTION:
804                 if (!set) {
805                         if (subevalvar(p, var, 0, subtype, startloc, varflags,
806                             quotes)) {
807                                 varflags &= ~VSNUL;
808                                 /*
809                                  * Remove any recorded regions beyond
810                                  * start of variable
811                                  */
812                                 removerecordregions(startloc);
813                                 goto again;
814                         }
815                         break;
816                 }
817                 if (easy)
818                         goto record;
819                 break;
820
821         case VSERROR:
822                 c = p - var - 1;
823                 error("${%.*s%s}: Bad substitution", c, var,
824                     (c > 0 && *p != CTLENDVAR) ? "..." : "");
825
826         default:
827                 abort();
828         }
829         p[-1] = '=';    /* recover overwritten '=' */
830
831         if (subtype != VSNORMAL) {      /* skip to end of alternative */
832                 int nesting = 1;
833                 for (;;) {
834                         if ((c = *p++) == CTLESC)
835                                 p++;
836                         else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) {
837                                 if (set)
838                                         argbackq = argbackq->next;
839                         } else if (c == CTLVAR) {
840                                 if ((*p++ & VSTYPE) != VSNORMAL)
841                                         nesting++;
842                         } else if (c == CTLENDVAR) {
843                                 if (--nesting == 0)
844                                         break;
845                         }
846                 }
847         }
848         return p;
849 }
850
851
852
853 /*
854  * Test whether a specialized variable is set.
855  */
856
857 static int
858 varisset(char *name, int nulok)
859 {
860
861         if (*name == '!')
862                 return backgndpidset();
863         else if (*name == '@' || *name == '*') {
864                 if (*shellparam.p == NULL)
865                         return 0;
866
867                 if (nulok) {
868                         char **av;
869
870                         for (av = shellparam.p; *av; av++)
871                                 if (**av != '\0')
872                                         return 1;
873                         return 0;
874                 }
875         } else if (is_digit(*name)) {
876                 char *ap;
877                 int num = atoi(name);
878
879                 if (num > shellparam.nparam)
880                         return 0;
881
882                 if (num == 0)
883                         ap = arg0;
884                 else
885                         ap = shellparam.p[num - 1];
886
887                 if (nulok && (ap == NULL || *ap == '\0'))
888                         return 0;
889         }
890         return 1;
891 }
892
893 static void
894 strtodest(const char *p, int flag, int subtype, int quoted)
895 {
896         if (flag & (EXP_FULL | EXP_CASE) && subtype != VSLENGTH)
897                 STPUTS_QUOTES(p, quoted ? DQSYNTAX : BASESYNTAX, expdest);
898         else
899                 STPUTS(p, expdest);
900 }
901
902 /*
903  * Add the value of a specialized variable to the stack string.
904  */
905
906 static void
907 varvalue(char *name, int quoted, int subtype, int flag)
908 {
909         int num;
910         char *p;
911         int i;
912         char sep;
913         char **ap;
914
915         switch (*name) {
916         case '$':
917                 num = rootpid;
918                 goto numvar;
919         case '?':
920                 num = oexitstatus;
921                 goto numvar;
922         case '#':
923                 num = shellparam.nparam;
924                 goto numvar;
925         case '!':
926                 num = backgndpidval();
927 numvar:
928                 expdest = cvtnum(num, expdest);
929                 break;
930         case '-':
931                 for (i = 0 ; i < NOPTS ; i++) {
932                         if (optlist[i].val)
933                                 STPUTC(optlist[i].letter, expdest);
934                 }
935                 break;
936         case '@':
937                 if (flag & EXP_FULL && quoted) {
938                         for (ap = shellparam.p ; (p = *ap++) != NULL ; ) {
939                                 strtodest(p, flag, subtype, quoted);
940                                 if (*ap)
941                                         STPUTC('\0', expdest);
942                         }
943                         break;
944                 }
945                 /* FALLTHROUGH */
946         case '*':
947                 if (ifsset())
948                         sep = ifsval()[0];
949                 else
950                         sep = ' ';
951                 for (ap = shellparam.p ; (p = *ap++) != NULL ; ) {
952                         strtodest(p, flag, subtype, quoted);
953                         if (!*ap)
954                                 break;
955                         if (sep || (flag & EXP_FULL && !quoted && **ap != '\0'))
956                                 STPUTC(sep, expdest);
957                 }
958                 break;
959         case '0':
960                 p = arg0;
961                 strtodest(p, flag, subtype, quoted);
962                 break;
963         default:
964                 if (is_digit(*name)) {
965                         num = atoi(name);
966                         if (num > 0 && num <= shellparam.nparam) {
967                                 p = shellparam.p[num - 1];
968                                 strtodest(p, flag, subtype, quoted);
969                         }
970                 }
971                 break;
972         }
973 }
974
975
976
977 /*
978  * Record the fact that we have to scan this region of the
979  * string for IFS characters.
980  */
981
982 static void
983 recordregion(int start, int end, int inquotes)
984 {
985         struct ifsregion *ifsp;
986
987         if (ifslastp == NULL) {
988                 ifsp = &ifsfirst;
989         } else {
990                 if (ifslastp->endoff == start
991                     && ifslastp->inquotes == inquotes) {
992                         /* extend previous area */
993                         ifslastp->endoff = end;
994                         return;
995                 }
996                 ifsp = (struct ifsregion *)ckmalloc(sizeof (struct ifsregion));
997                 ifslastp->next = ifsp;
998         }
999         ifslastp = ifsp;
1000         ifslastp->next = NULL;
1001         ifslastp->begoff = start;
1002         ifslastp->endoff = end;
1003         ifslastp->inquotes = inquotes;
1004 }
1005
1006
1007
1008 /*
1009  * Break the argument string into pieces based upon IFS and add the
1010  * strings to the argument list.  The regions of the string to be
1011  * searched for IFS characters have been stored by recordregion.
1012  * CTLESC characters are preserved but have little effect in this pass
1013  * other than escaping CTL* characters.  In particular, they do not escape
1014  * IFS characters: that should be done with the ifsregion mechanism.
1015  * CTLQUOTEMARK characters are used to preserve empty quoted strings.
1016  * This pass treats them as a regular character, making the string non-empty.
1017  * Later, they are removed along with the other CTL* characters.
1018  */
1019 static void
1020 ifsbreakup(char *string, struct arglist *arglist)
1021 {
1022         struct ifsregion *ifsp;
1023         struct strlist *sp;
1024         char *start;
1025         char *p;
1026         char *q;
1027         const char *ifs;
1028         const char *ifsspc;
1029         int had_param_ch = 0;
1030
1031         start = string;
1032
1033         if (ifslastp == NULL) {
1034                 /* Return entire argument, IFS doesn't apply to any of it */
1035                 sp = (struct strlist *)stalloc(sizeof *sp);
1036                 sp->text = start;
1037                 *arglist->lastp = sp;
1038                 arglist->lastp = &sp->next;
1039                 return;
1040         }
1041
1042         ifs = ifsset() ? ifsval() : " \t\n";
1043
1044         for (ifsp = &ifsfirst; ifsp != NULL; ifsp = ifsp->next) {
1045                 p = string + ifsp->begoff;
1046                 while (p < string + ifsp->endoff) {
1047                         q = p;
1048                         if (*p == CTLESC)
1049                                 p++;
1050                         if (ifsp->inquotes) {
1051                                 /* Only NULs (should be from "$@") end args */
1052                                 had_param_ch = 1;
1053                                 if (*p != 0) {
1054                                         p++;
1055                                         continue;
1056                                 }
1057                                 ifsspc = NULL;
1058                         } else {
1059                                 if (!strchr(ifs, *p)) {
1060                                         had_param_ch = 1;
1061                                         p++;
1062                                         continue;
1063                                 }
1064                                 ifsspc = strchr(" \t\n", *p);
1065
1066                                 /* Ignore IFS whitespace at start */
1067                                 if (q == start && ifsspc != NULL) {
1068                                         p++;
1069                                         start = p;
1070                                         continue;
1071                                 }
1072                                 had_param_ch = 0;
1073                         }
1074
1075                         /* Save this argument... */
1076                         *q = '\0';
1077                         sp = (struct strlist *)stalloc(sizeof *sp);
1078                         sp->text = start;
1079                         *arglist->lastp = sp;
1080                         arglist->lastp = &sp->next;
1081                         p++;
1082
1083                         if (ifsspc != NULL) {
1084                                 /* Ignore further trailing IFS whitespace */
1085                                 for (; p < string + ifsp->endoff; p++) {
1086                                         q = p;
1087                                         if (*p == CTLESC)
1088                                                 p++;
1089                                         if (strchr(ifs, *p) == NULL) {
1090                                                 p = q;
1091                                                 break;
1092                                         }
1093                                         if (strchr(" \t\n", *p) == NULL) {
1094                                                 p++;
1095                                                 break;
1096                                         }
1097                                 }
1098                         }
1099                         start = p;
1100                 }
1101         }
1102
1103         /*
1104          * Save anything left as an argument.
1105          * Traditionally we have treated 'IFS=':'; set -- x$IFS' as
1106          * generating 2 arguments, the second of which is empty.
1107          * Some recent clarification of the Posix spec say that it
1108          * should only generate one....
1109          */
1110         if (had_param_ch || *start != 0) {
1111                 sp = (struct strlist *)stalloc(sizeof *sp);
1112                 sp->text = start;
1113                 *arglist->lastp = sp;
1114                 arglist->lastp = &sp->next;
1115         }
1116 }
1117
1118
1119 static char expdir[PATH_MAX];
1120 #define expdir_end (expdir + sizeof(expdir))
1121
1122 /*
1123  * Perform pathname generation and remove control characters.
1124  * At this point, the only control characters should be CTLESC and CTLQUOTEMARK.
1125  * The results are stored in the list exparg.
1126  */
1127 static void
1128 expandmeta(struct strlist *str, int flag __unused)
1129 {
1130         char *p;
1131         struct strlist **savelastp;
1132         struct strlist *sp;
1133         char c;
1134         /* TODO - EXP_REDIR */
1135
1136         while (str) {
1137                 if (fflag)
1138                         goto nometa;
1139                 p = str->text;
1140                 for (;;) {                      /* fast check for meta chars */
1141                         if ((c = *p++) == '\0')
1142                                 goto nometa;
1143                         if (c == '*' || c == '?' || c == '[')
1144                                 break;
1145                 }
1146                 savelastp = exparg.lastp;
1147                 INTOFF;
1148                 expmeta(expdir, str->text);
1149                 INTON;
1150                 if (exparg.lastp == savelastp) {
1151                         /*
1152                          * no matches
1153                          */
1154 nometa:
1155                         *exparg.lastp = str;
1156                         rmescapes(str->text);
1157                         exparg.lastp = &str->next;
1158                 } else {
1159                         *exparg.lastp = NULL;
1160                         *savelastp = sp = expsort(*savelastp);
1161                         while (sp->next != NULL)
1162                                 sp = sp->next;
1163                         exparg.lastp = &sp->next;
1164                 }
1165                 str = str->next;
1166         }
1167 }
1168
1169
1170 /*
1171  * Do metacharacter (i.e. *, ?, [...]) expansion.
1172  */
1173
1174 static void
1175 expmeta(char *enddir, char *name)
1176 {
1177         char *p;
1178         char *q;
1179         char *start;
1180         char *endname;
1181         int metaflag;
1182         struct stat statb;
1183         DIR *dirp;
1184         struct dirent *dp;
1185         int atend;
1186         int matchdot;
1187         int esc;
1188         int namlen;
1189
1190         metaflag = 0;
1191         start = name;
1192         for (p = name; esc = 0, *p; p += esc + 1) {
1193                 if (*p == '*' || *p == '?')
1194                         metaflag = 1;
1195                 else if (*p == '[') {
1196                         q = p + 1;
1197                         if (*q == '!' || *q == '^')
1198                                 q++;
1199                         for (;;) {
1200                                 while (*q == CTLQUOTEMARK)
1201                                         q++;
1202                                 if (*q == CTLESC)
1203                                         q++;
1204                                 if (*q == '/' || *q == '\0')
1205                                         break;
1206                                 if (*++q == ']') {
1207                                         metaflag = 1;
1208                                         break;
1209                                 }
1210                         }
1211                 } else if (*p == '\0')
1212                         break;
1213                 else if (*p == CTLQUOTEMARK)
1214                         continue;
1215                 else {
1216                         if (*p == CTLESC)
1217                                 esc++;
1218                         if (p[esc] == '/') {
1219                                 if (metaflag)
1220                                         break;
1221                                 start = p + esc + 1;
1222                         }
1223                 }
1224         }
1225         if (metaflag == 0) {    /* we've reached the end of the file name */
1226                 if (enddir != expdir)
1227                         metaflag++;
1228                 for (p = name ; ; p++) {
1229                         if (*p == CTLQUOTEMARK)
1230                                 continue;
1231                         if (*p == CTLESC)
1232                                 p++;
1233                         *enddir++ = *p;
1234                         if (*p == '\0')
1235                                 break;
1236                         if (enddir == expdir_end)
1237                                 return;
1238                 }
1239                 if (metaflag == 0 || lstat(expdir, &statb) >= 0)
1240                         addfname(expdir);
1241                 return;
1242         }
1243         endname = p;
1244         if (start != name) {
1245                 p = name;
1246                 while (p < start) {
1247                         while (*p == CTLQUOTEMARK)
1248                                 p++;
1249                         if (*p == CTLESC)
1250                                 p++;
1251                         *enddir++ = *p++;
1252                         if (enddir == expdir_end)
1253                                 return;
1254                 }
1255         }
1256         if (enddir == expdir) {
1257                 p = __DECONST(char *, ".");
1258         } else if (enddir == expdir + 1 && *expdir == '/') {
1259                 p = __DECONST(char *, "/");
1260         } else {
1261                 p = expdir;
1262                 enddir[-1] = '\0';
1263         }
1264         if ((dirp = opendir(p)) == NULL)
1265                 return;
1266         if (enddir != expdir)
1267                 enddir[-1] = '/';
1268         if (*endname == 0) {
1269                 atend = 1;
1270         } else {
1271                 atend = 0;
1272                 *endname = '\0';
1273                 endname += esc + 1;
1274         }
1275         matchdot = 0;
1276         p = start;
1277         while (*p == CTLQUOTEMARK)
1278                 p++;
1279         if (*p == CTLESC)
1280                 p++;
1281         if (*p == '.')
1282                 matchdot++;
1283         while (! int_pending() && (dp = readdir(dirp)) != NULL) {
1284                 if (dp->d_name[0] == '.' && ! matchdot)
1285                         continue;
1286                 if (patmatch(start, dp->d_name, 0)) {
1287                         namlen = dp->d_namlen;
1288                         if (enddir + namlen + 1 > expdir_end)
1289                                 continue;
1290                         memcpy(enddir, dp->d_name, namlen + 1);
1291                         if (atend)
1292                                 addfname(expdir);
1293                         else {
1294                                 if (enddir + namlen + 2 > expdir_end)
1295                                         continue;
1296                                 enddir[namlen] = '/';
1297                                 enddir[namlen + 1] = '\0';
1298                                 expmeta(enddir + namlen + 1, endname);
1299                         }
1300                 }
1301         }
1302         closedir(dirp);
1303         if (! atend)
1304                 endname[-esc - 1] = esc ? CTLESC : '/';
1305 }
1306
1307
1308 /*
1309  * Add a file name to the list.
1310  */
1311
1312 static void
1313 addfname(char *name)
1314 {
1315         char *p;
1316         struct strlist *sp;
1317
1318         p = stalloc(strlen(name) + 1);
1319         scopy(name, p);
1320         sp = (struct strlist *)stalloc(sizeof *sp);
1321         sp->text = p;
1322         *exparg.lastp = sp;
1323         exparg.lastp = &sp->next;
1324 }
1325
1326
1327 /*
1328  * Sort the results of file name expansion.  It calculates the number of
1329  * strings to sort and then calls msort (short for merge sort) to do the
1330  * work.
1331  */
1332
1333 static struct strlist *
1334 expsort(struct strlist *str)
1335 {
1336         int len;
1337         struct strlist *sp;
1338
1339         len = 0;
1340         for (sp = str ; sp ; sp = sp->next)
1341                 len++;
1342         return msort(str, len);
1343 }
1344
1345
1346 static struct strlist *
1347 msort(struct strlist *list, int len)
1348 {
1349         struct strlist *p, *q = NULL;
1350         struct strlist **lpp;
1351         int half;
1352         int n;
1353
1354         if (len <= 1)
1355                 return list;
1356         half = len >> 1;
1357         p = list;
1358         for (n = half ; --n >= 0 ; ) {
1359                 q = p;
1360                 p = p->next;
1361         }
1362         q->next = NULL;                 /* terminate first half of list */
1363         q = msort(list, half);          /* sort first half of list */
1364         p = msort(p, len - half);               /* sort second half */
1365         lpp = &list;
1366         for (;;) {
1367                 if (strcmp(p->text, q->text) < 0) {
1368                         *lpp = p;
1369                         lpp = &p->next;
1370                         if ((p = *lpp) == NULL) {
1371                                 *lpp = q;
1372                                 break;
1373                         }
1374                 } else {
1375                         *lpp = q;
1376                         lpp = &q->next;
1377                         if ((q = *lpp) == NULL) {
1378                                 *lpp = p;
1379                                 break;
1380                         }
1381                 }
1382         }
1383         return list;
1384 }
1385
1386
1387
1388 static wchar_t
1389 get_wc(const char **p)
1390 {
1391         wchar_t c;
1392         int chrlen;
1393
1394         chrlen = mbtowc(&c, *p, 4);
1395         if (chrlen == 0)
1396                 return 0;
1397         else if (chrlen == -1)
1398                 c = 0;
1399         else
1400                 *p += chrlen;
1401         return c;
1402 }
1403
1404
1405 /*
1406  * See if a character matches a character class, starting at the first colon
1407  * of "[:class:]".
1408  * If a valid character class is recognized, a pointer to the next character
1409  * after the final closing bracket is stored into *end, otherwise a null
1410  * pointer is stored into *end.
1411  */
1412 static int
1413 match_charclass(const char *p, wchar_t chr, const char **end)
1414 {
1415         char name[20];
1416         const char *nameend;
1417         wctype_t cclass;
1418
1419         *end = NULL;
1420         p++;
1421         nameend = strstr(p, ":]");
1422         if (nameend == NULL || nameend - p >= (int)sizeof(name) || nameend == p)
1423                 return 0;
1424         memcpy(name, p, nameend - p);
1425         name[nameend - p] = '\0';
1426         *end = nameend + 2;
1427         cclass = wctype(name);
1428         /* An unknown class matches nothing but is valid nevertheless. */
1429         if (cclass == 0)
1430                 return 0;
1431         return iswctype(chr, cclass);
1432 }
1433
1434
1435 /*
1436  * Returns true if the pattern matches the string.
1437  */
1438
1439 int
1440 patmatch(const char *pattern, const char *string, int squoted)
1441 {
1442         const char *p, *q, *end;
1443         char c;
1444         wchar_t wc, wc2;
1445
1446         p = pattern;
1447         q = string;
1448         for (;;) {
1449                 switch (c = *p++) {
1450                 case '\0':
1451                         goto breakloop;
1452                 case CTLESC:
1453                         if (squoted && *q == CTLESC)
1454                                 q++;
1455                         if (*q++ != *p++)
1456                                 return 0;
1457                         break;
1458                 case CTLQUOTEMARK:
1459                         continue;
1460                 case '?':
1461                         if (squoted && *q == CTLESC)
1462                                 q++;
1463                         if (localeisutf8)
1464                                 wc = get_wc(&q);
1465                         else
1466                                 wc = (unsigned char)*q++;
1467                         if (wc == '\0')
1468                                 return 0;
1469                         break;
1470                 case '*':
1471                         c = *p;
1472                         while (c == CTLQUOTEMARK || c == '*')
1473                                 c = *++p;
1474                         if (c != CTLESC &&  c != CTLQUOTEMARK &&
1475                             c != '?' && c != '*' && c != '[') {
1476                                 while (*q != c) {
1477                                         if (squoted && *q == CTLESC &&
1478                                             q[1] == c)
1479                                                 break;
1480                                         if (*q == '\0')
1481                                                 return 0;
1482                                         if (squoted && *q == CTLESC)
1483                                                 q++;
1484                                         q++;
1485                                 }
1486                         }
1487                         do {
1488                                 if (patmatch(p, q, squoted))
1489                                         return 1;
1490                                 if (squoted && *q == CTLESC)
1491                                         q++;
1492                         } while (*q++ != '\0');
1493                         return 0;
1494                 case '[': {
1495                         const char *endp;
1496                         int invert, found;
1497                         wchar_t chr;
1498
1499                         endp = p;
1500                         if (*endp == '!' || *endp == '^')
1501                                 endp++;
1502                         for (;;) {
1503                                 while (*endp == CTLQUOTEMARK)
1504                                         endp++;
1505                                 if (*endp == '\0')
1506                                         goto dft;               /* no matching ] */
1507                                 if (*endp == CTLESC)
1508                                         endp++;
1509                                 if (*++endp == ']')
1510                                         break;
1511                         }
1512                         invert = 0;
1513                         if (*p == '!' || *p == '^') {
1514                                 invert++;
1515                                 p++;
1516                         }
1517                         found = 0;
1518                         if (squoted && *q == CTLESC)
1519                                 q++;
1520                         if (localeisutf8)
1521                                 chr = get_wc(&q);
1522                         else
1523                                 chr = (unsigned char)*q++;
1524                         if (chr == '\0')
1525                                 return 0;
1526                         c = *p++;
1527                         do {
1528                                 if (c == CTLQUOTEMARK)
1529                                         continue;
1530                                 if (c == '[' && *p == ':') {
1531                                         found |= match_charclass(p, chr, &end);
1532                                         if (end != NULL)
1533                                                 p = end;
1534                                 }
1535                                 if (c == CTLESC)
1536                                         c = *p++;
1537                                 if (localeisutf8 && c & 0x80) {
1538                                         p--;
1539                                         wc = get_wc(&p);
1540                                         if (wc == 0) /* bad utf-8 */
1541                                                 return 0;
1542                                 } else
1543                                         wc = (unsigned char)c;
1544                                 if (*p == '-' && p[1] != ']') {
1545                                         p++;
1546                                         while (*p == CTLQUOTEMARK)
1547                                                 p++;
1548                                         if (*p == CTLESC)
1549                                                 p++;
1550                                         if (localeisutf8) {
1551                                                 wc2 = get_wc(&p);
1552                                                 if (wc2 == 0) /* bad utf-8 */
1553                                                         return 0;
1554                                         } else
1555                                                 wc2 = (unsigned char)*p++;
1556                                         if (   collate_range_cmp(chr, wc) >= 0
1557                                             && collate_range_cmp(chr, wc2) <= 0
1558                                            )
1559                                                 found = 1;
1560                                 } else {
1561                                         if (chr == wc)
1562                                                 found = 1;
1563                                 }
1564                         } while ((c = *p++) != ']');
1565                         if (found == invert)
1566                                 return 0;
1567                         break;
1568                 }
1569 dft:            default:
1570                         if (squoted && *q == CTLESC)
1571                                 q++;
1572                         if (*q++ != c)
1573                                 return 0;
1574                         break;
1575                 }
1576         }
1577 breakloop:
1578         if (*q != '\0')
1579                 return 0;
1580         return 1;
1581 }
1582
1583
1584
1585 /*
1586  * Remove any CTLESC and CTLQUOTEMARK characters from a string.
1587  */
1588
1589 void
1590 rmescapes(char *str)
1591 {
1592         char *p, *q;
1593
1594         p = str;
1595         while (*p != CTLESC && *p != CTLQUOTEMARK && *p != CTLQUOTEEND) {
1596                 if (*p++ == '\0')
1597                         return;
1598         }
1599         q = p;
1600         while (*p) {
1601                 if (*p == CTLQUOTEMARK || *p == CTLQUOTEEND) {
1602                         p++;
1603                         continue;
1604                 }
1605                 if (*p == CTLESC)
1606                         p++;
1607                 *q++ = *p++;
1608         }
1609         *q = '\0';
1610 }
1611
1612
1613
1614 /*
1615  * See if a pattern matches in a case statement.
1616  */
1617
1618 int
1619 casematch(union node *pattern, const char *val)
1620 {
1621         struct stackmark smark;
1622         int result;
1623         char *p;
1624
1625         setstackmark(&smark);
1626         argbackq = pattern->narg.backquote;
1627         STARTSTACKSTR(expdest);
1628         ifslastp = NULL;
1629         argstr(pattern->narg.text, EXP_TILDE | EXP_CASE);
1630         STPUTC('\0', expdest);
1631         p = grabstackstr(expdest);
1632         result = patmatch(p, val, 0);
1633         popstackmark(&smark);
1634         return result;
1635 }
1636
1637 /*
1638  * Our own itoa().
1639  */
1640
1641 static char *
1642 cvtnum(int num, char *buf)
1643 {
1644         char temp[32];
1645         int neg = num < 0;
1646         char *p = temp + 31;
1647
1648         temp[31] = '\0';
1649
1650         do {
1651                 *--p = num % 10 + '0';
1652         } while ((num /= 10) != 0);
1653
1654         if (neg)
1655                 *--p = '-';
1656
1657         STPUTS(p, buf);
1658         return buf;
1659 }
1660
1661 /*
1662  * Do most of the work for wordexp(3).
1663  */
1664
1665 int
1666 wordexpcmd(int argc, char **argv)
1667 {
1668         size_t len;
1669         int i;
1670
1671         out1fmt("%08x", argc - 1);
1672         for (i = 1, len = 0; i < argc; i++)
1673                 len += strlen(argv[i]);
1674         out1fmt("%08x", (int)len);
1675         for (i = 1; i < argc; i++)
1676                 outbin(argv[i], strlen(argv[i]) + 1, out1);
1677         return (0);
1678 }