sh: Fix duplicate prototypes for builtins.
[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 1.90 2011/06/13 21:03:27 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
56 /*
57  * Routines to expand arguments to commands.  We have to deal with
58  * backquotes, shell variables, and file metacharacters.
59  */
60
61 #include "shell.h"
62 #include "main.h"
63 #include "nodes.h"
64 #include "eval.h"
65 #include "expand.h"
66 #include "syntax.h"
67 #include "parser.h"
68 #include "jobs.h"
69 #include "options.h"
70 #include "var.h"
71 #include "input.h"
72 #include "output.h"
73 #include "memalloc.h"
74 #include "error.h"
75 #include "mystring.h"
76 #include "arith.h"
77 #include "show.h"
78 #include "builtins.h"
79
80 /*
81  * Structure specifying which parts of the string should be searched
82  * for IFS characters.
83  */
84
85 struct ifsregion {
86         struct ifsregion *next; /* next region in list */
87         int begoff;             /* offset of start of region */
88         int endoff;             /* offset of end of region */
89         int inquotes;           /* search for nul bytes only */
90 };
91
92
93 static char *expdest;                   /* output of current string */
94 static struct nodelist *argbackq;       /* list of back quote expressions */
95 static struct ifsregion ifsfirst;       /* first struct in list of ifs regions */
96 static struct ifsregion *ifslastp;      /* last struct in list */
97 static struct arglist exparg;           /* holds expanded arg list */
98
99 static void argstr(char *, int);
100 static char *exptilde(char *, int);
101 static void expbackq(union node *, int, int);
102 static int subevalvar(char *, char *, int, int, int, int, int);
103 static char *evalvar(char *, int);
104 static int varisset(char *, int);
105 static void varvalue(char *, int, int, int);
106 static void recordregion(int, int, int);
107 static void removerecordregions(int);
108 static void ifsbreakup(char *, struct arglist *);
109 static void expandmeta(struct strlist *, int);
110 static void expmeta(char *, char *);
111 static void addfname(char *);
112 static struct strlist *expsort(struct strlist *);
113 static struct strlist *msort(struct strlist *, int);
114 static char *cvtnum(int, char *);
115 static int collate_range_cmp(wchar_t, wchar_t);
116
117 static int
118 collate_range_cmp(wchar_t c1, wchar_t c2)
119 {
120         static wchar_t s1[2], s2[2];
121
122         s1[0] = c1;
123         s2[0] = c2;
124         return (wcscoll(s1, s2));
125 }
126
127 /*
128  * Expand shell variables and backquotes inside a here document.
129  *      union node *arg         the document
130  *      int fd;                 where to write the expanded version
131  */
132
133 void
134 expandhere(union node *arg, int fd)
135 {
136         expandarg(arg, NULL, 0);
137         xwrite(fd, stackblock(), expdest - stackblock());
138 }
139
140 static char *
141 stputs_quotes(const char *data, const char *syntax, char *p)
142 {
143         while (*data) {
144                 CHECKSTRSPACE(2, p);
145                 if (syntax[(int)*data] == CCTL)
146                         USTPUTC(CTLESC, p);
147                 USTPUTC(*data++, p);
148         }
149         return (p);
150 }
151 #define STPUTS_QUOTES(data, syntax, p) p = stputs_quotes((data), syntax, p)
152
153 /*
154  * Perform expansions on an argument, placing the resulting list of arguments
155  * in arglist.  Parameter expansion, command substitution and arithmetic
156  * expansion are always performed; additional expansions can be requested
157  * via flag (EXP_*).
158  * The result is left in the stack string.
159  * When arglist is NULL, perform here document expansion.
160  *
161  * Caution: this function uses global state and is not reentrant.
162  * However, a new invocation after an interrupted invocation is safe
163  * and will reset the global state for the new call.
164  */
165 void
166 expandarg(union node *arg, struct arglist *arglist, int flag)
167 {
168         struct strlist *sp;
169         char *p;
170
171         argbackq = arg->narg.backquote;
172         STARTSTACKSTR(expdest);
173         ifsfirst.next = NULL;
174         ifslastp = NULL;
175         argstr(arg->narg.text, flag);
176         if (arglist == NULL) {
177                 STACKSTRNUL(expdest);
178                 return;                 /* here document expanded */
179         }
180         STPUTC('\0', expdest);
181         p = grabstackstr(expdest);
182         exparg.lastp = &exparg.list;
183         /*
184          * TODO - EXP_REDIR
185          */
186         if (flag & EXP_FULL) {
187                 ifsbreakup(p, &exparg);
188                 *exparg.lastp = NULL;
189                 exparg.lastp = &exparg.list;
190                 expandmeta(exparg.list, flag);
191         } else {
192                 if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */
193                         rmescapes(p);
194                 sp = (struct strlist *)stalloc(sizeof (struct strlist));
195                 sp->text = p;
196                 *exparg.lastp = sp;
197                 exparg.lastp = &sp->next;
198         }
199         while (ifsfirst.next != NULL) {
200                 struct ifsregion *ifsp;
201                 INTOFF;
202                 ifsp = ifsfirst.next->next;
203                 ckfree(ifsfirst.next);
204                 ifsfirst.next = ifsp;
205                 INTON;
206         }
207         *exparg.lastp = NULL;
208         if (exparg.list) {
209                 *arglist->lastp = exparg.list;
210                 arglist->lastp = exparg.lastp;
211         }
212 }
213
214
215
216 /*
217  * Perform parameter expansion, command substitution and arithmetic
218  * expansion, and tilde expansion if requested via EXP_TILDE/EXP_VARTILDE.
219  * Processing ends at a CTLENDVAR character as well as '\0'.
220  * This is used to expand word in ${var+word} etc.
221  * If EXP_FULL, EXP_CASE or EXP_REDIR are set, keep and/or generate CTLESC
222  * characters to allow for further processing.
223  * If EXP_FULL is set, also preserve CTLQUOTEMARK characters.
224  */
225 static void
226 argstr(char *p, int flag)
227 {
228         char c;
229         int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR);  /* do CTLESC */
230         int firsteq = 1;
231         int split_lit;
232         int lit_quoted;
233
234         split_lit = flag & EXP_SPLIT_LIT;
235         lit_quoted = flag & EXP_LIT_QUOTED;
236         flag &= ~(EXP_SPLIT_LIT | EXP_LIT_QUOTED);
237         if (*p == '~' && (flag & (EXP_TILDE | EXP_VARTILDE)))
238                 p = exptilde(p, flag);
239         for (;;) {
240                 CHECKSTRSPACE(2, expdest);
241                 switch (c = *p++) {
242                 case '\0':
243                 case CTLENDVAR:
244                         goto breakloop;
245                 case CTLQUOTEMARK:
246                         lit_quoted = 1;
247                         /* "$@" syntax adherence hack */
248                         if (p[0] == CTLVAR && p[2] == '@' && p[3] == '=')
249                                 break;
250                         if ((flag & EXP_FULL) != 0)
251                                 USTPUTC(c, expdest);
252                         break;
253                 case CTLQUOTEEND:
254                         lit_quoted = 0;
255                         break;
256                 case CTLESC:
257                         if (quotes)
258                                 USTPUTC(c, expdest);
259                         c = *p++;
260                         USTPUTC(c, expdest);
261                         if (split_lit && !lit_quoted)
262                                 recordregion(expdest - stackblock() -
263                                     (quotes ? 2 : 1),
264                                     expdest - stackblock(), 0);
265                         break;
266                 case CTLVAR:
267                         p = evalvar(p, flag);
268                         break;
269                 case CTLBACKQ:
270                 case CTLBACKQ|CTLQUOTE:
271                         expbackq(argbackq->n, c & CTLQUOTE, flag);
272                         argbackq = argbackq->next;
273                         break;
274                 case CTLENDARI:
275                         expari(flag);
276                         break;
277                 case ':':
278                 case '=':
279                         /*
280                          * sort of a hack - expand tildes in variable
281                          * assignments (after the first '=' and after ':'s).
282                          */
283                         USTPUTC(c, expdest);
284                         if (split_lit && !lit_quoted)
285                                 recordregion(expdest - stackblock() - 1,
286                                     expdest - stackblock(), 0);
287                         if (flag & EXP_VARTILDE && *p == '~' &&
288                             (c != '=' || firsteq)) {
289                                 if (c == '=')
290                                         firsteq = 0;
291                                 p = exptilde(p, flag);
292                         }
293                         break;
294                 default:
295                         USTPUTC(c, expdest);
296                         if (split_lit && !lit_quoted)
297                                 recordregion(expdest - stackblock() - 1,
298                                     expdest - stackblock(), 0);
299                 }
300         }
301 breakloop:;
302 }
303
304 /*
305  * Perform tilde expansion, placing the result in the stack string and
306  * returning the next position in the input string to process.
307  */
308 static char *
309 exptilde(char *p, int flag)
310 {
311         char c, *startp = p;
312         struct passwd *pw;
313         char *home;
314         int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR);
315
316         while ((c = *p) != '\0') {
317                 switch(c) {
318                 case CTLESC: /* This means CTL* are always considered quoted. */
319                 case CTLVAR:
320                 case CTLBACKQ:
321                 case CTLBACKQ | CTLQUOTE:
322                 case CTLARI:
323                 case CTLENDARI:
324                 case CTLQUOTEMARK:
325                         return (startp);
326                 case ':':
327                         if (flag & EXP_VARTILDE)
328                                 goto done;
329                         break;
330                 case '/':
331                 case CTLENDVAR:
332                         goto done;
333                 }
334                 p++;
335         }
336 done:
337         *p = '\0';
338         if (*(startp+1) == '\0') {
339                 if ((home = lookupvar("HOME")) == NULL)
340                         goto lose;
341         } else {
342                 if ((pw = getpwnam(startp+1)) == NULL)
343                         goto lose;
344                 home = pw->pw_dir;
345         }
346         if (*home == '\0')
347                 goto lose;
348         *p = c;
349         if (quotes)
350                 STPUTS_QUOTES(home, SQSYNTAX, expdest);
351         else
352                 STPUTS(home, expdest);
353         return (p);
354 lose:
355         *p = c;
356         return (startp);
357 }
358
359
360 static void
361 removerecordregions(int endoff)
362 {
363         if (ifslastp == NULL)
364                 return;
365
366         if (ifsfirst.endoff > endoff) {
367                 while (ifsfirst.next != NULL) {
368                         struct ifsregion *ifsp;
369                         INTOFF;
370                         ifsp = ifsfirst.next->next;
371                         ckfree(ifsfirst.next);
372                         ifsfirst.next = ifsp;
373                         INTON;
374                 }
375                 if (ifsfirst.begoff > endoff)
376                         ifslastp = NULL;
377                 else {
378                         ifslastp = &ifsfirst;
379                         ifsfirst.endoff = endoff;
380                 }
381                 return;
382         }
383
384         ifslastp = &ifsfirst;
385         while (ifslastp->next && ifslastp->next->begoff < endoff)
386                 ifslastp=ifslastp->next;
387         while (ifslastp->next != NULL) {
388                 struct ifsregion *ifsp;
389                 INTOFF;
390                 ifsp = ifslastp->next->next;
391                 ckfree(ifslastp->next);
392                 ifslastp->next = ifsp;
393                 INTON;
394         }
395         if (ifslastp->endoff > endoff)
396                 ifslastp->endoff = endoff;
397 }
398
399 /*
400  * Expand arithmetic expression.  Backup to start of expression,
401  * evaluate, place result in (backed up) result, adjust string position.
402  */
403 void
404 expari(int flag)
405 {
406         char *p, *q, *start;
407         arith_t result;
408         int begoff;
409         int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR);
410         int quoted;
411
412         /*
413          * This routine is slightly over-complicated for
414          * efficiency.  First we make sure there is
415          * enough space for the result, which may be bigger
416          * than the expression.  Next we
417          * scan backwards looking for the start of arithmetic.  If the
418          * next previous character is a CTLESC character, then we
419          * have to rescan starting from the beginning since CTLESC
420          * characters have to be processed left to right.
421          */
422         CHECKSTRSPACE(DIGITS(result) - 2, expdest);
423         USTPUTC('\0', expdest);
424         start = stackblock();
425         p = expdest - 2;
426         while (p >= start && *p != CTLARI)
427                 --p;
428         if (p < start || *p != CTLARI)
429                 error("missing CTLARI (shouldn't happen)");
430         if (p > start && *(p - 1) == CTLESC)
431                 for (p = start; *p != CTLARI; p++)
432                         if (*p == CTLESC)
433                                 p++;
434
435         if (p[1] == '"')
436                 quoted=1;
437         else
438                 quoted=0;
439         begoff = p - start;
440         removerecordregions(begoff);
441         if (quotes)
442                 rmescapes(p+2);
443         q = grabstackstr(expdest);
444         result = arith(p+2);
445         ungrabstackstr(q, expdest);
446         fmtstr(p, DIGITS(result), ARITH_FORMAT_STR, result);
447         while (*p++)
448                 ;
449         if (quoted == 0)
450                 recordregion(begoff, p - 1 - start, 0);
451         result = expdest - p + 1;
452         STADJUST(-result, expdest);
453 }
454
455
456 /*
457  * Perform command substitution.
458  */
459 static void
460 expbackq(union node *cmd, int quoted, int flag)
461 {
462         struct backcmd in;
463         int i;
464         char buf[128];
465         char *p;
466         char *dest = expdest;
467         struct ifsregion saveifs, *savelastp;
468         struct nodelist *saveargbackq;
469         char lastc;
470         int startloc = dest - stackblock();
471         char const *syntax = quoted? DQSYNTAX : BASESYNTAX;
472         int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR);
473         int nnl;
474
475         INTOFF;
476         saveifs = ifsfirst;
477         savelastp = ifslastp;
478         saveargbackq = argbackq;
479         p = grabstackstr(dest);
480         evalbackcmd(cmd, &in);
481         ungrabstackstr(p, dest);
482         ifsfirst = saveifs;
483         ifslastp = savelastp;
484         argbackq = saveargbackq;
485
486         p = in.buf;
487         lastc = '\0';
488         nnl = 0;
489         /* Don't copy trailing newlines */
490         for (;;) {
491                 if (--in.nleft < 0) {
492                         if (in.fd < 0)
493                                 break;
494                         while ((i = read(in.fd, buf, sizeof buf)) < 0 && errno == EINTR);
495                         TRACE(("expbackq: read returns %d\n", i));
496                         if (i <= 0)
497                                 break;
498                         p = buf;
499                         in.nleft = i - 1;
500                 }
501                 lastc = *p++;
502                 if (lastc != '\0') {
503                         if (lastc == '\n') {
504                                 nnl++;
505                         } else {
506                                 CHECKSTRSPACE(nnl + 2, dest);
507                                 while (nnl > 0) {
508                                         nnl--;
509                                         USTPUTC('\n', dest);
510                                 }
511                                 if (quotes && syntax[(int)lastc] == CCTL)
512                                         USTPUTC(CTLESC, dest);
513                                 USTPUTC(lastc, dest);
514                         }
515                 }
516         }
517
518         if (in.fd >= 0)
519                 close(in.fd);
520         if (in.buf)
521                 ckfree(in.buf);
522         if (in.jp)
523                 exitstatus = waitforjob(in.jp, NULL);
524         if (quoted == 0)
525                 recordregion(startloc, dest - stackblock(), 0);
526         TRACE(("expbackq: size=%td: \"%.*s\"\n",
527                 ((dest - stackblock()) - startloc),
528                 (int)((dest - stackblock()) - startloc),
529                 stackblock() + startloc));
530         expdest = dest;
531         INTON;
532 }
533
534
535
536 static int
537 subevalvar(char *p, char *str, int strloc, int subtype, int startloc,
538   int varflags, int quotes)
539 {
540         char *startp;
541         char *loc = NULL;
542         char *q;
543         int c = 0;
544         struct nodelist *saveargbackq = argbackq;
545         int amount;
546
547         argstr(p, (subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX ||
548             subtype == VSTRIMRIGHT || subtype == VSTRIMRIGHTMAX ?
549             EXP_CASE : 0) | EXP_TILDE);
550         STACKSTRNUL(expdest);
551         argbackq = saveargbackq;
552         startp = stackblock() + startloc;
553         if (str == NULL)
554             str = stackblock() + strloc;
555
556         switch (subtype) {
557         case VSASSIGN:
558                 setvar(str, startp, 0);
559                 amount = startp - expdest;
560                 STADJUST(amount, expdest);
561                 varflags &= ~VSNUL;
562                 return 1;
563
564         case VSQUESTION:
565                 if (*p != CTLENDVAR) {
566                         outfmt(out2, "%s\n", startp);
567                         error(NULL);
568                 }
569                 error("%.*s: parameter %snot set", (int)(p - str - 1),
570                       str, (varflags & VSNUL) ? "null or "
571                                               : nullstr);
572                 return 0;
573
574         case VSTRIMLEFT:
575                 for (loc = startp; loc < str; loc++) {
576                         c = *loc;
577                         *loc = '\0';
578                         if (patmatch(str, startp, quotes)) {
579                                 *loc = c;
580                                 goto recordleft;
581                         }
582                         *loc = c;
583                         if (quotes && *loc == CTLESC)
584                                 loc++;
585                 }
586                 return 0;
587
588         case VSTRIMLEFTMAX:
589                 for (loc = str - 1; loc >= startp;) {
590                         c = *loc;
591                         *loc = '\0';
592                         if (patmatch(str, startp, quotes)) {
593                                 *loc = c;
594                                 goto recordleft;
595                         }
596                         *loc = c;
597                         loc--;
598                         if (quotes && loc > startp && *(loc - 1) == CTLESC) {
599                                 for (q = startp; q < loc; q++)
600                                         if (*q == CTLESC)
601                                                 q++;
602                                 if (q > loc)
603                                         loc--;
604                         }
605                 }
606                 return 0;
607
608         case VSTRIMRIGHT:
609                 for (loc = str - 1; loc >= startp;) {
610                         if (patmatch(str, loc, quotes)) {
611                                 amount = loc - expdest;
612                                 STADJUST(amount, expdest);
613                                 return 1;
614                         }
615                         loc--;
616                         if (quotes && loc > startp && *(loc - 1) == CTLESC) {
617                                 for (q = startp; q < loc; q++)
618                                         if (*q == CTLESC)
619                                                 q++;
620                                 if (q > loc)
621                                         loc--;
622                         }
623                 }
624                 return 0;
625
626         case VSTRIMRIGHTMAX:
627                 for (loc = startp; loc < str - 1; loc++) {
628                         if (patmatch(str, loc, quotes)) {
629                                 amount = loc - expdest;
630                                 STADJUST(amount, expdest);
631                                 return 1;
632                         }
633                         if (quotes && *loc == CTLESC)
634                                 loc++;
635                 }
636                 return 0;
637
638
639         default:
640                 abort();
641         }
642
643 recordleft:
644         amount = ((str - 1) - (loc - startp)) - expdest;
645         STADJUST(amount, expdest);
646         while (loc != str - 1)
647                 *startp++ = *loc++;
648         return 1;
649 }
650
651
652 /*
653  * Expand a variable, and return a pointer to the next character in the
654  * input string.
655  */
656
657 static char *
658 evalvar(char *p, int flag)
659 {
660         int subtype;
661         int varflags;
662         char *var;
663         char *val;
664         int patloc;
665         int c;
666         int set;
667         int special;
668         int startloc;
669         int varlen;
670         int varlenb;
671         int easy;
672         int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR);
673
674         varflags = (unsigned char)*p++;
675         subtype = varflags & VSTYPE;
676         var = p;
677         special = 0;
678         if (! is_name(*p))
679                 special = 1;
680         p = strchr(p, '=') + 1;
681 again: /* jump here after setting a variable with ${var=text} */
682         if (varflags & VSLINENO) {
683                 set = 1;
684                 special = 0;
685                 val = var;
686                 p[-1] = '\0';   /* temporarily overwrite '=' to have \0
687                                    terminated string */
688         } else if (special) {
689                 set = varisset(var, varflags & VSNUL);
690                 val = NULL;
691         } else {
692                 val = bltinlookup(var, 1);
693                 if (val == NULL || ((varflags & VSNUL) && val[0] == '\0')) {
694                         val = NULL;
695                         set = 0;
696                 } else
697                         set = 1;
698         }
699         varlen = 0;
700         startloc = expdest - stackblock();
701         if (!set && uflag && *var != '@' && *var != '*') {
702                 switch (subtype) {
703                 case VSNORMAL:
704                 case VSTRIMLEFT:
705                 case VSTRIMLEFTMAX:
706                 case VSTRIMRIGHT:
707                 case VSTRIMRIGHTMAX:
708                 case VSLENGTH:
709                         error("%.*s: parameter not set", (int)(p - var - 1),
710                             var);
711                 }
712         }
713         if (set && subtype != VSPLUS) {
714                 /* insert the value of the variable */
715                 if (special) {
716                         varvalue(var, varflags & VSQUOTE, subtype, flag);
717                         if (subtype == VSLENGTH) {
718                                 varlenb = expdest - stackblock() - startloc;
719                                 varlen = varlenb;
720                                 if (localeisutf8) {
721                                         val = stackblock() + startloc;
722                                         for (;val != expdest; val++)
723                                                 if ((*val & 0xC0) == 0x80)
724                                                         varlen--;
725                                 }
726                                 STADJUST(-varlenb, expdest);
727                         }
728                 } else {
729                         char const *syntax = (varflags & VSQUOTE) ? DQSYNTAX
730                                                                   : BASESYNTAX;
731
732                         if (subtype == VSLENGTH) {
733                                 for (;*val; val++)
734                                         if (!localeisutf8 ||
735                                             (*val & 0xC0) != 0x80)
736                                                 varlen++;
737                         }
738                         else {
739                                 if (quotes)
740                                         STPUTS_QUOTES(val, syntax, expdest);
741                                 else
742                                         STPUTS(val, expdest);
743
744                         }
745                 }
746         }
747
748         if (subtype == VSPLUS)
749                 set = ! set;
750
751         easy = ((varflags & VSQUOTE) == 0 ||
752                 (*var == '@' && shellparam.nparam != 1));
753
754
755         switch (subtype) {
756         case VSLENGTH:
757                 expdest = cvtnum(varlen, expdest);
758                 goto record;
759
760         case VSNORMAL:
761                 if (!easy)
762                         break;
763 record:
764                 recordregion(startloc, expdest - stackblock(),
765                     varflags & VSQUOTE || (ifsset() && ifsval()[0] == '\0' &&
766                     (*var == '@' || *var == '*')));
767                 break;
768
769         case VSPLUS:
770         case VSMINUS:
771                 if (!set) {
772                         argstr(p, flag | (flag & EXP_FULL ? EXP_SPLIT_LIT : 0) |
773                             (varflags & VSQUOTE ? EXP_LIT_QUOTED : 0));
774                         break;
775                 }
776                 if (easy)
777                         goto record;
778                 break;
779
780         case VSTRIMLEFT:
781         case VSTRIMLEFTMAX:
782         case VSTRIMRIGHT:
783         case VSTRIMRIGHTMAX:
784                 if (!set)
785                         break;
786                 /*
787                  * Terminate the string and start recording the pattern
788                  * right after it
789                  */
790                 STPUTC('\0', expdest);
791                 patloc = expdest - stackblock();
792                 if (subevalvar(p, NULL, patloc, subtype,
793                     startloc, varflags, quotes) == 0) {
794                         int amount = (expdest - stackblock() - patloc) + 1;
795                         STADJUST(-amount, expdest);
796                 }
797                 /* Remove any recorded regions beyond start of variable */
798                 removerecordregions(startloc);
799                 goto record;
800
801         case VSASSIGN:
802         case VSQUESTION:
803                 if (!set) {
804                         if (subevalvar(p, var, 0, subtype, startloc, varflags,
805                             quotes)) {
806                                 varflags &= ~VSNUL;
807                                 /*
808                                  * Remove any recorded regions beyond
809                                  * start of variable
810                                  */
811                                 removerecordregions(startloc);
812                                 goto again;
813                         }
814                         break;
815                 }
816                 if (easy)
817                         goto record;
818                 break;
819
820         case VSERROR:
821                 c = p - var - 1;
822                 error("${%.*s%s}: Bad substitution", c, var,
823                     (c > 0 && *p != CTLENDVAR) ? "..." : "");
824
825         default:
826                 abort();
827         }
828         p[-1] = '=';    /* recover overwritten '=' */
829
830         if (subtype != VSNORMAL) {      /* skip to end of alternative */
831                 int nesting = 1;
832                 for (;;) {
833                         if ((c = *p++) == CTLESC)
834                                 p++;
835                         else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) {
836                                 if (set)
837                                         argbackq = argbackq->next;
838                         } else if (c == CTLVAR) {
839                                 if ((*p++ & VSTYPE) != VSNORMAL)
840                                         nesting++;
841                         } else if (c == CTLENDVAR) {
842                                 if (--nesting == 0)
843                                         break;
844                         }
845                 }
846         }
847         return p;
848 }
849
850
851
852 /*
853  * Test whether a specialized variable is set.
854  */
855
856 static int
857 varisset(char *name, int nulok)
858 {
859
860         if (*name == '!')
861                 return backgndpidset();
862         else if (*name == '@' || *name == '*') {
863                 if (*shellparam.p == NULL)
864                         return 0;
865
866                 if (nulok) {
867                         char **av;
868
869                         for (av = shellparam.p; *av; av++)
870                                 if (**av != '\0')
871                                         return 1;
872                         return 0;
873                 }
874         } else if (is_digit(*name)) {
875                 char *ap;
876                 int num = atoi(name);
877
878                 if (num > shellparam.nparam)
879                         return 0;
880
881                 if (num == 0)
882                         ap = arg0;
883                 else
884                         ap = shellparam.p[num - 1];
885
886                 if (nulok && (ap == NULL || *ap == '\0'))
887                         return 0;
888         }
889         return 1;
890 }
891
892 static void
893 strtodest(const char *p, int flag, int subtype, int quoted)
894 {
895         if (flag & (EXP_FULL | EXP_CASE) && subtype != VSLENGTH)
896                 STPUTS_QUOTES(p, quoted ? DQSYNTAX : BASESYNTAX, expdest);
897         else
898                 STPUTS(p, expdest);
899 }
900
901 /*
902  * Add the value of a specialized variable to the stack string.
903  */
904
905 static void
906 varvalue(char *name, int quoted, int subtype, int flag)
907 {
908         int num;
909         char *p;
910         int i;
911         char sep;
912         char **ap;
913
914         switch (*name) {
915         case '$':
916                 num = rootpid;
917                 goto numvar;
918         case '?':
919                 num = oexitstatus;
920                 goto numvar;
921         case '#':
922                 num = shellparam.nparam;
923                 goto numvar;
924         case '!':
925                 num = backgndpidval();
926 numvar:
927                 expdest = cvtnum(num, expdest);
928                 break;
929         case '-':
930                 for (i = 0 ; i < NOPTS ; i++) {
931                         if (optlist[i].val)
932                                 STPUTC(optlist[i].letter, expdest);
933                 }
934                 break;
935         case '@':
936                 if (flag & EXP_FULL && quoted) {
937                         for (ap = shellparam.p ; (p = *ap++) != NULL ; ) {
938                                 strtodest(p, flag, subtype, quoted);
939                                 if (*ap)
940                                         STPUTC('\0', expdest);
941                         }
942                         break;
943                 }
944                 /* FALLTHROUGH */
945         case '*':
946                 if (ifsset())
947                         sep = ifsval()[0];
948                 else
949                         sep = ' ';
950                 for (ap = shellparam.p ; (p = *ap++) != NULL ; ) {
951                         strtodest(p, flag, subtype, quoted);
952                         if (!*ap)
953                                 break;
954                         if (sep || (flag & EXP_FULL && !quoted && **ap != '\0'))
955                                 STPUTC(sep, expdest);
956                 }
957                 break;
958         case '0':
959                 p = arg0;
960                 strtodest(p, flag, subtype, quoted);
961                 break;
962         default:
963                 if (is_digit(*name)) {
964                         num = atoi(name);
965                         if (num > 0 && num <= shellparam.nparam) {
966                                 p = shellparam.p[num - 1];
967                                 strtodest(p, flag, subtype, quoted);
968                         }
969                 }
970                 break;
971         }
972 }
973
974
975
976 /*
977  * Record the fact that we have to scan this region of the
978  * string for IFS characters.
979  */
980
981 static void
982 recordregion(int start, int end, int inquotes)
983 {
984         struct ifsregion *ifsp;
985
986         if (ifslastp == NULL) {
987                 ifsp = &ifsfirst;
988         } else {
989                 if (ifslastp->endoff == start
990                     && ifslastp->inquotes == inquotes) {
991                         /* extend previous area */
992                         ifslastp->endoff = end;
993                         return;
994                 }
995                 ifsp = (struct ifsregion *)ckmalloc(sizeof (struct ifsregion));
996                 ifslastp->next = ifsp;
997         }
998         ifslastp = ifsp;
999         ifslastp->next = NULL;
1000         ifslastp->begoff = start;
1001         ifslastp->endoff = end;
1002         ifslastp->inquotes = inquotes;
1003 }
1004
1005
1006
1007 /*
1008  * Break the argument string into pieces based upon IFS and add the
1009  * strings to the argument list.  The regions of the string to be
1010  * searched for IFS characters have been stored by recordregion.
1011  * CTLESC characters are preserved but have little effect in this pass
1012  * other than escaping CTL* characters.  In particular, they do not escape
1013  * IFS characters: that should be done with the ifsregion mechanism.
1014  * CTLQUOTEMARK characters are used to preserve empty quoted strings.
1015  * This pass treats them as a regular character, making the string non-empty.
1016  * Later, they are removed along with the other CTL* characters.
1017  */
1018 static void
1019 ifsbreakup(char *string, struct arglist *arglist)
1020 {
1021         struct ifsregion *ifsp;
1022         struct strlist *sp;
1023         char *start;
1024         char *p;
1025         char *q;
1026         const char *ifs;
1027         const char *ifsspc;
1028         int had_param_ch = 0;
1029
1030         start = string;
1031
1032         if (ifslastp == NULL) {
1033                 /* Return entire argument, IFS doesn't apply to any of it */
1034                 sp = (struct strlist *)stalloc(sizeof *sp);
1035                 sp->text = start;
1036                 *arglist->lastp = sp;
1037                 arglist->lastp = &sp->next;
1038                 return;
1039         }
1040
1041         ifs = ifsset() ? ifsval() : " \t\n";
1042
1043         for (ifsp = &ifsfirst; ifsp != NULL; ifsp = ifsp->next) {
1044                 p = string + ifsp->begoff;
1045                 while (p < string + ifsp->endoff) {
1046                         q = p;
1047                         if (*p == CTLESC)
1048                                 p++;
1049                         if (ifsp->inquotes) {
1050                                 /* Only NULs (should be from "$@") end args */
1051                                 had_param_ch = 1;
1052                                 if (*p != 0) {
1053                                         p++;
1054                                         continue;
1055                                 }
1056                                 ifsspc = NULL;
1057                         } else {
1058                                 if (!strchr(ifs, *p)) {
1059                                         had_param_ch = 1;
1060                                         p++;
1061                                         continue;
1062                                 }
1063                                 ifsspc = strchr(" \t\n", *p);
1064
1065                                 /* Ignore IFS whitespace at start */
1066                                 if (q == start && ifsspc != NULL) {
1067                                         p++;
1068                                         start = p;
1069                                         continue;
1070                                 }
1071                                 had_param_ch = 0;
1072                         }
1073
1074                         /* Save this argument... */
1075                         *q = '\0';
1076                         sp = (struct strlist *)stalloc(sizeof *sp);
1077                         sp->text = start;
1078                         *arglist->lastp = sp;
1079                         arglist->lastp = &sp->next;
1080                         p++;
1081
1082                         if (ifsspc != NULL) {
1083                                 /* Ignore further trailing IFS whitespace */
1084                                 for (; p < string + ifsp->endoff; p++) {
1085                                         q = p;
1086                                         if (*p == CTLESC)
1087                                                 p++;
1088                                         if (strchr(ifs, *p) == NULL) {
1089                                                 p = q;
1090                                                 break;
1091                                         }
1092                                         if (strchr(" \t\n", *p) == NULL) {
1093                                                 p++;
1094                                                 break;
1095                                         }
1096                                 }
1097                         }
1098                         start = p;
1099                 }
1100         }
1101
1102         /*
1103          * Save anything left as an argument.
1104          * Traditionally we have treated 'IFS=':'; set -- x$IFS' as
1105          * generating 2 arguments, the second of which is empty.
1106          * Some recent clarification of the Posix spec say that it
1107          * should only generate one....
1108          */
1109         if (had_param_ch || *start != 0) {
1110                 sp = (struct strlist *)stalloc(sizeof *sp);
1111                 sp->text = start;
1112                 *arglist->lastp = sp;
1113                 arglist->lastp = &sp->next;
1114         }
1115 }
1116
1117
1118 static char expdir[PATH_MAX];
1119 #define expdir_end (expdir + sizeof(expdir))
1120
1121 /*
1122  * Perform pathname generation and remove control characters.
1123  * At this point, the only control characters should be CTLESC and CTLQUOTEMARK.
1124  * The results are stored in the list exparg.
1125  */
1126 static void
1127 expandmeta(struct strlist *str, int flag __unused)
1128 {
1129         char *p;
1130         struct strlist **savelastp;
1131         struct strlist *sp;
1132         char c;
1133         /* TODO - EXP_REDIR */
1134
1135         while (str) {
1136                 if (fflag)
1137                         goto nometa;
1138                 p = str->text;
1139                 for (;;) {                      /* fast check for meta chars */
1140                         if ((c = *p++) == '\0')
1141                                 goto nometa;
1142                         if (c == '*' || c == '?' || c == '[')
1143                                 break;
1144                 }
1145                 savelastp = exparg.lastp;
1146                 INTOFF;
1147                 expmeta(expdir, str->text);
1148                 INTON;
1149                 if (exparg.lastp == savelastp) {
1150                         /*
1151                          * no matches
1152                          */
1153 nometa:
1154                         *exparg.lastp = str;
1155                         rmescapes(str->text);
1156                         exparg.lastp = &str->next;
1157                 } else {
1158                         *exparg.lastp = NULL;
1159                         *savelastp = sp = expsort(*savelastp);
1160                         while (sp->next != NULL)
1161                                 sp = sp->next;
1162                         exparg.lastp = &sp->next;
1163                 }
1164                 str = str->next;
1165         }
1166 }
1167
1168
1169 /*
1170  * Do metacharacter (i.e. *, ?, [...]) expansion.
1171  */
1172
1173 static void
1174 expmeta(char *enddir, char *name)
1175 {
1176         char *p;
1177         char *q;
1178         char *start;
1179         char *endname;
1180         int metaflag;
1181         struct stat statb;
1182         DIR *dirp;
1183         struct dirent *dp;
1184         int atend;
1185         int matchdot;
1186         int esc;
1187
1188         metaflag = 0;
1189         start = name;
1190         for (p = name; esc = 0, *p; p += esc + 1) {
1191                 if (*p == '*' || *p == '?')
1192                         metaflag = 1;
1193                 else if (*p == '[') {
1194                         q = p + 1;
1195                         if (*q == '!' || *q == '^')
1196                                 q++;
1197                         for (;;) {
1198                                 while (*q == CTLQUOTEMARK)
1199                                         q++;
1200                                 if (*q == CTLESC)
1201                                         q++;
1202                                 if (*q == '/' || *q == '\0')
1203                                         break;
1204                                 if (*++q == ']') {
1205                                         metaflag = 1;
1206                                         break;
1207                                 }
1208                         }
1209                 } else if (*p == '\0')
1210                         break;
1211                 else if (*p == CTLQUOTEMARK)
1212                         continue;
1213                 else {
1214                         if (*p == CTLESC)
1215                                 esc++;
1216                         if (p[esc] == '/') {
1217                                 if (metaflag)
1218                                         break;
1219                                 start = p + esc + 1;
1220                         }
1221                 }
1222         }
1223         if (metaflag == 0) {    /* we've reached the end of the file name */
1224                 if (enddir != expdir)
1225                         metaflag++;
1226                 for (p = name ; ; p++) {
1227                         if (*p == CTLQUOTEMARK)
1228                                 continue;
1229                         if (*p == CTLESC)
1230                                 p++;
1231                         *enddir++ = *p;
1232                         if (*p == '\0')
1233                                 break;
1234                         if (enddir == expdir_end)
1235                                 return;
1236                 }
1237                 if (metaflag == 0 || lstat(expdir, &statb) >= 0)
1238                         addfname(expdir);
1239                 return;
1240         }
1241         endname = p;
1242         if (start != name) {
1243                 p = name;
1244                 while (p < start) {
1245                         while (*p == CTLQUOTEMARK)
1246                                 p++;
1247                         if (*p == CTLESC)
1248                                 p++;
1249                         *enddir++ = *p++;
1250                         if (enddir == expdir_end)
1251                                 return;
1252                 }
1253         }
1254         if (enddir == expdir) {
1255                 p = __DECONST(char *, ".");
1256         } else if (enddir == expdir + 1 && *expdir == '/') {
1257                 p = __DECONST(char *, "/");
1258         } else {
1259                 p = expdir;
1260                 enddir[-1] = '\0';
1261         }
1262         if ((dirp = opendir(p)) == NULL)
1263                 return;
1264         if (enddir != expdir)
1265                 enddir[-1] = '/';
1266         if (*endname == 0) {
1267                 atend = 1;
1268         } else {
1269                 atend = 0;
1270                 *endname = '\0';
1271                 endname += esc + 1;
1272         }
1273         matchdot = 0;
1274         p = start;
1275         while (*p == CTLQUOTEMARK)
1276                 p++;
1277         if (*p == CTLESC)
1278                 p++;
1279         if (*p == '.')
1280                 matchdot++;
1281         while (! int_pending() && (dp = readdir(dirp)) != NULL) {
1282                 if (dp->d_name[0] == '.' && ! matchdot)
1283                         continue;
1284                 if (patmatch(start, dp->d_name, 0)) {
1285                         if (enddir + dp->d_namlen + 1 > expdir_end)
1286                                 continue;
1287                         memcpy(enddir, dp->d_name, dp->d_namlen + 1);
1288                         if (atend)
1289                                 addfname(expdir);
1290                         else {
1291                                 if (enddir + dp->d_namlen + 2 > expdir_end)
1292                                         continue;
1293                                 enddir[dp->d_namlen] = '/';
1294                                 enddir[dp->d_namlen + 1] = '\0';
1295                                 expmeta(enddir + dp->d_namlen + 1, endname);
1296                         }
1297                 }
1298         }
1299         closedir(dirp);
1300         if (! atend)
1301                 endname[-esc - 1] = esc ? CTLESC : '/';
1302 }
1303
1304
1305 /*
1306  * Add a file name to the list.
1307  */
1308
1309 static void
1310 addfname(char *name)
1311 {
1312         char *p;
1313         struct strlist *sp;
1314
1315         p = stalloc(strlen(name) + 1);
1316         scopy(name, p);
1317         sp = (struct strlist *)stalloc(sizeof *sp);
1318         sp->text = p;
1319         *exparg.lastp = sp;
1320         exparg.lastp = &sp->next;
1321 }
1322
1323
1324 /*
1325  * Sort the results of file name expansion.  It calculates the number of
1326  * strings to sort and then calls msort (short for merge sort) to do the
1327  * work.
1328  */
1329
1330 static struct strlist *
1331 expsort(struct strlist *str)
1332 {
1333         int len;
1334         struct strlist *sp;
1335
1336         len = 0;
1337         for (sp = str ; sp ; sp = sp->next)
1338                 len++;
1339         return msort(str, len);
1340 }
1341
1342
1343 static struct strlist *
1344 msort(struct strlist *list, int len)
1345 {
1346         struct strlist *p, *q = NULL;
1347         struct strlist **lpp;
1348         int half;
1349         int n;
1350
1351         if (len <= 1)
1352                 return list;
1353         half = len >> 1;
1354         p = list;
1355         for (n = half ; --n >= 0 ; ) {
1356                 q = p;
1357                 p = p->next;
1358         }
1359         q->next = NULL;                 /* terminate first half of list */
1360         q = msort(list, half);          /* sort first half of list */
1361         p = msort(p, len - half);               /* sort second half */
1362         lpp = &list;
1363         for (;;) {
1364                 if (strcmp(p->text, q->text) < 0) {
1365                         *lpp = p;
1366                         lpp = &p->next;
1367                         if ((p = *lpp) == NULL) {
1368                                 *lpp = q;
1369                                 break;
1370                         }
1371                 } else {
1372                         *lpp = q;
1373                         lpp = &q->next;
1374                         if ((q = *lpp) == NULL) {
1375                                 *lpp = p;
1376                                 break;
1377                         }
1378                 }
1379         }
1380         return list;
1381 }
1382
1383
1384
1385 static wchar_t
1386 get_wc(const char **p)
1387 {
1388         wchar_t c;
1389         int chrlen;
1390
1391         chrlen = mbtowc(&c, *p, 4);
1392         if (chrlen == 0)
1393                 return 0;
1394         else if (chrlen == -1)
1395                 c = 0;
1396         else
1397                 *p += chrlen;
1398         return c;
1399 }
1400
1401
1402 /*
1403  * Returns true if the pattern matches the string.
1404  */
1405
1406 int
1407 patmatch(const char *pattern, const char *string, int squoted)
1408 {
1409         const char *p, *q;
1410         char c;
1411         wchar_t wc, wc2;
1412
1413         p = pattern;
1414         q = string;
1415         for (;;) {
1416                 switch (c = *p++) {
1417                 case '\0':
1418                         goto breakloop;
1419                 case CTLESC:
1420                         if (squoted && *q == CTLESC)
1421                                 q++;
1422                         if (*q++ != *p++)
1423                                 return 0;
1424                         break;
1425                 case CTLQUOTEMARK:
1426                         continue;
1427                 case '?':
1428                         if (squoted && *q == CTLESC)
1429                                 q++;
1430                         if (localeisutf8)
1431                                 wc = get_wc(&q);
1432                         else
1433                                 wc = (unsigned char)*q++;
1434                         if (wc == '\0')
1435                                 return 0;
1436                         break;
1437                 case '*':
1438                         c = *p;
1439                         while (c == CTLQUOTEMARK || c == '*')
1440                                 c = *++p;
1441                         if (c != CTLESC &&  c != CTLQUOTEMARK &&
1442                             c != '?' && c != '*' && c != '[') {
1443                                 while (*q != c) {
1444                                         if (squoted && *q == CTLESC &&
1445                                             q[1] == c)
1446                                                 break;
1447                                         if (*q == '\0')
1448                                                 return 0;
1449                                         if (squoted && *q == CTLESC)
1450                                                 q++;
1451                                         q++;
1452                                 }
1453                         }
1454                         do {
1455                                 if (patmatch(p, q, squoted))
1456                                         return 1;
1457                                 if (squoted && *q == CTLESC)
1458                                         q++;
1459                         } while (*q++ != '\0');
1460                         return 0;
1461                 case '[': {
1462                         const char *endp;
1463                         int invert, found;
1464                         wchar_t chr;
1465
1466                         endp = p;
1467                         if (*endp == '!' || *endp == '^')
1468                                 endp++;
1469                         for (;;) {
1470                                 while (*endp == CTLQUOTEMARK)
1471                                         endp++;
1472                                 if (*endp == '\0')
1473                                         goto dft;               /* no matching ] */
1474                                 if (*endp == CTLESC)
1475                                         endp++;
1476                                 if (*++endp == ']')
1477                                         break;
1478                         }
1479                         invert = 0;
1480                         if (*p == '!' || *p == '^') {
1481                                 invert++;
1482                                 p++;
1483                         }
1484                         found = 0;
1485                         if (squoted && *q == CTLESC)
1486                                 q++;
1487                         if (localeisutf8)
1488                                 chr = get_wc(&q);
1489                         else
1490                                 chr = (unsigned char)*q++;
1491                         if (chr == '\0')
1492                                 return 0;
1493                         c = *p++;
1494                         do {
1495                                 if (c == CTLQUOTEMARK)
1496                                         continue;
1497                                 if (c == CTLESC)
1498                                         c = *p++;
1499                                 if (localeisutf8 && c & 0x80) {
1500                                         p--;
1501                                         wc = get_wc(&p);
1502                                         if (wc == 0) /* bad utf-8 */
1503                                                 return 0;
1504                                 } else
1505                                         wc = (unsigned char)c;
1506                                 if (*p == '-' && p[1] != ']') {
1507                                         p++;
1508                                         while (*p == CTLQUOTEMARK)
1509                                                 p++;
1510                                         if (*p == CTLESC)
1511                                                 p++;
1512                                         if (localeisutf8) {
1513                                                 wc2 = get_wc(&p);
1514                                                 if (wc2 == 0) /* bad utf-8 */
1515                                                         return 0;
1516                                         } else
1517                                                 wc2 = (unsigned char)*p++;
1518                                         if (   collate_range_cmp(chr, wc) >= 0
1519                                             && collate_range_cmp(chr, wc2) <= 0
1520                                            )
1521                                                 found = 1;
1522                                 } else {
1523                                         if (chr == wc)
1524                                                 found = 1;
1525                                 }
1526                         } while ((c = *p++) != ']');
1527                         if (found == invert)
1528                                 return 0;
1529                         break;
1530                 }
1531 dft:            default:
1532                         if (squoted && *q == CTLESC)
1533                                 q++;
1534                         if (*q++ != c)
1535                                 return 0;
1536                         break;
1537                 }
1538         }
1539 breakloop:
1540         if (*q != '\0')
1541                 return 0;
1542         return 1;
1543 }
1544
1545
1546
1547 /*
1548  * Remove any CTLESC and CTLQUOTEMARK characters from a string.
1549  */
1550
1551 void
1552 rmescapes(char *str)
1553 {
1554         char *p, *q;
1555
1556         p = str;
1557         while (*p != CTLESC && *p != CTLQUOTEMARK && *p != CTLQUOTEEND) {
1558                 if (*p++ == '\0')
1559                         return;
1560         }
1561         q = p;
1562         while (*p) {
1563                 if (*p == CTLQUOTEMARK || *p == CTLQUOTEEND) {
1564                         p++;
1565                         continue;
1566                 }
1567                 if (*p == CTLESC)
1568                         p++;
1569                 *q++ = *p++;
1570         }
1571         *q = '\0';
1572 }
1573
1574
1575
1576 /*
1577  * See if a pattern matches in a case statement.
1578  */
1579
1580 int
1581 casematch(union node *pattern, const char *val)
1582 {
1583         struct stackmark smark;
1584         int result;
1585         char *p;
1586
1587         setstackmark(&smark);
1588         argbackq = pattern->narg.backquote;
1589         STARTSTACKSTR(expdest);
1590         ifslastp = NULL;
1591         argstr(pattern->narg.text, EXP_TILDE | EXP_CASE);
1592         STPUTC('\0', expdest);
1593         p = grabstackstr(expdest);
1594         result = patmatch(p, val, 0);
1595         popstackmark(&smark);
1596         return result;
1597 }
1598
1599 /*
1600  * Our own itoa().
1601  */
1602
1603 static char *
1604 cvtnum(int num, char *buf)
1605 {
1606         char temp[32];
1607         int neg = num < 0;
1608         char *p = temp + 31;
1609
1610         temp[31] = '\0';
1611
1612         do {
1613                 *--p = num % 10 + '0';
1614         } while ((num /= 10) != 0);
1615
1616         if (neg)
1617                 *--p = '-';
1618
1619         STPUTS(p, buf);
1620         return buf;
1621 }
1622
1623 /*
1624  * Do most of the work for wordexp(3).
1625  */
1626
1627 int
1628 wordexpcmd(int argc, char **argv)
1629 {
1630         size_t len;
1631         int i;
1632
1633         out1fmt("%08x", argc - 1);
1634         for (i = 1, len = 0; i < argc; i++)
1635                 len += strlen(argv[i]);
1636         out1fmt("%08x", (int)len);
1637         for (i = 1; i < argc; i++)
1638                 outbin(argv[i], strlen(argv[i]) + 1, out1);
1639         return (0);
1640 }