1 /* $OpenBSD: glob.c,v 1.35 2011/01/12 01:53:14 djm Exp $ */
2 /*
3 * Copyright (c) 1989, 1993
4 * The Regents of the University of California. All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * Guido van Rossum.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 /* OPENBSD ORIGINAL: lib/libc/gen/glob.c */
35
36 /*
37 * glob(3) -- a superset of the one defined in POSIX 1003.2.
38 *
39 * The [!...] convention to negate a range is supported (SysV, Posix, ksh).
40 *
41 * Optional extra services, controlled by flags not defined by POSIX:
42 *
43 * GLOB_QUOTE:
44 * Escaping convention: \ inhibits any special meaning the following
45 * character might have (except \ at end of string is retained).
46 * GLOB_MAGCHAR:
47 * Set in gl_flags if pattern contained a globbing character.
48 * GLOB_NOMAGIC:
49 * Same as GLOB_NOCHECK, but it will only append pattern if it did
50 * not contain any magic characters. [Used in csh style globbing]
51 * GLOB_ALTDIRFUNC:
52 * Use alternately specified directory access functions.
53 * GLOB_TILDE:
54 * expand ~user/foo to the /home/dir/of/user/foo
55 * GLOB_BRACE:
56 * expand {1,2}{a,b} to 1a 1b 2a 2b
57 * gl_matchc:
58 * Number of matches in the current invocation of glob.
59 */
60
61 #include "includes.h"
62
63 #include <sys/types.h>
64 #include <sys/stat.h>
65
66 #include <dirent.h>
67 #include <ctype.h>
68 #include <errno.h>
69 #include <pwd.h>
70 #include <stdlib.h>
71 #include <string.h>
72 #include <unistd.h>
73
74 #if !defined(HAVE_GLOB) || !defined(GLOB_HAS_ALTDIRFUNC) || \
75 !defined(GLOB_HAS_GL_MATCHC) || !defined(GLOB_HAS_GL_STATV) || \
76 !defined(HAVE_DECL_GLOB_NOMATCH) || HAVE_DECL_GLOB_NOMATCH == 0 || \
77 defined(BROKEN_GLOB)
78
79 #include "charclass.h"
80
81 #define DOLLAR '$'
82 #define DOT '.'
83 #define EOS '\0'
84 #define LBRACKET '['
85 #define NOT '!'
86 #define QUESTION '?'
87 #define QUOTE '\\'
88 #define RANGE '-'
89 #define RBRACKET ']'
90 #define SEP '/'
91 #define STAR '*'
92 #define TILDE '~'
93 #define UNDERSCORE '_'
94 #define LBRACE '{'
95 #define RBRACE '}'
96 #define SLASH '/'
97 #define COMMA ','
98
99 #ifndef DEBUG
100
101 #define M_QUOTE 0x8000
102 #define M_PROTECT 0x4000
103 #define M_MASK 0xffff
104 #define M_ASCII 0x00ff
105
106 typedef u_short Char;
107
108 #else
109
110 #define M_QUOTE 0x80
111 #define M_PROTECT 0x40
112 #define M_MASK 0xff
113 #define M_ASCII 0x7f
114
115 typedef char Char;
116
117 #endif
118
119
120 #define CHAR(c) ((Char)((c)&M_ASCII))
121 #define META(c) ((Char)((c)|M_QUOTE))
122 #define M_ALL META('*')
123 #define M_END META(']')
124 #define M_NOT META('!')
125 #define M_ONE META('?')
126 #define M_RNG META('-')
127 #define M_SET META('[')
128 #define M_CLASS META(':')
129 #define ismeta(c) (((c)&M_QUOTE) != 0)
130
131 #define GLOB_LIMIT_MALLOC 65536
132 #define GLOB_LIMIT_STAT 128
133 #define GLOB_LIMIT_READDIR 16384
134
135 struct glob_lim {
136 size_t glim_malloc;
137 size_t glim_stat;
138 size_t glim_readdir;
139 };
140
141 static int compare(const void *, const void *);
142 static int g_Ctoc(const Char *, char *, u_int);
143 static int g_lstat(Char *, struct stat *, glob_t *);
144 static DIR *g_opendir(Char *, glob_t *);
145 static Char *g_strchr(const Char *, int);
146 static int g_strncmp(const Char *, const char *, size_t);
147 static int g_stat(Char *, struct stat *, glob_t *);
148 static int glob0(const Char *, glob_t *, struct glob_lim *);
149 static int glob1(Char *, Char *, glob_t *, struct glob_lim *);
150 static int glob2(Char *, Char *, Char *, Char *, Char *, Char *,
151 glob_t *, struct glob_lim *);
152 static int glob3(Char *, Char *, Char *, Char *, Char *,
153 Char *, Char *, glob_t *, struct glob_lim *);
154 static int globextend(const Char *, glob_t *, struct glob_lim *,
155 struct stat *);
156 static const Char *
157 globtilde(const Char *, Char *, size_t, glob_t *);
158 static int globexp1(const Char *, glob_t *, struct glob_lim *);
159 static int globexp2(const Char *, const Char *, glob_t *,
160 struct glob_lim *);
161 static int match(Char *, Char *, Char *);
162 #ifdef DEBUG
163 static void qprintf(const char *, Char *);
164 #endif
165
166 int
glob(const char * pattern,int flags,int (* errfunc)(const char *,int),glob_t * pglob)167 glob(const char *pattern, int flags, int (*errfunc)(const char *, int),
168 glob_t *pglob)
169 {
170 const u_char *patnext;
171 int c;
172 Char *bufnext, *bufend, patbuf[MAXPATHLEN];
173 struct glob_lim limit = { 0, 0, 0 };
174
175 patnext = (u_char *) pattern;
176 if (!(flags & GLOB_APPEND)) {
177 pglob->gl_pathc = 0;
178 pglob->gl_pathv = NULL;
179 pglob->gl_statv = NULL;
180 if (!(flags & GLOB_DOOFFS))
181 pglob->gl_offs = 0;
182 }
183 pglob->gl_flags = flags & ~GLOB_MAGCHAR;
184 pglob->gl_errfunc = errfunc;
185 pglob->gl_matchc = 0;
186
187 if (pglob->gl_offs < 0 || pglob->gl_pathc < 0 ||
188 pglob->gl_offs >= INT_MAX || pglob->gl_pathc >= INT_MAX ||
189 pglob->gl_pathc >= INT_MAX - pglob->gl_offs - 1)
190 return GLOB_NOSPACE;
191
192 bufnext = patbuf;
193 bufend = bufnext + MAXPATHLEN - 1;
194 if (flags & GLOB_NOESCAPE)
195 while (bufnext < bufend && (c = *patnext++) != EOS)
196 *bufnext++ = c;
197 else {
198 /* Protect the quoted characters. */
199 while (bufnext < bufend && (c = *patnext++) != EOS)
200 if (c == QUOTE) {
201 if ((c = *patnext++) == EOS) {
202 c = QUOTE;
203 --patnext;
204 }
205 *bufnext++ = c | M_PROTECT;
206 } else
207 *bufnext++ = c;
208 }
209 *bufnext = EOS;
210
211 if (flags & GLOB_BRACE)
212 return globexp1(patbuf, pglob, &limit);
213 else
214 return glob0(patbuf, pglob, &limit);
215 }
216
217 /*
218 * Expand recursively a glob {} pattern. When there is no more expansion
219 * invoke the standard globbing routine to glob the rest of the magic
220 * characters
221 */
222 static int
globexp1(const Char * pattern,glob_t * pglob,struct glob_lim * limitp)223 globexp1(const Char *pattern, glob_t *pglob, struct glob_lim *limitp)
224 {
225 const Char* ptr = pattern;
226
227 /* Protect a single {}, for find(1), like csh */
228 if (pattern[0] == LBRACE && pattern[1] == RBRACE && pattern[2] == EOS)
229 return glob0(pattern, pglob, limitp);
230
231 if ((ptr = (const Char *) g_strchr(ptr, LBRACE)) != NULL)
232 return globexp2(ptr, pattern, pglob, limitp);
233
234 return glob0(pattern, pglob, limitp);
235 }
236
237
238 /*
239 * Recursive brace globbing helper. Tries to expand a single brace.
240 * If it succeeds then it invokes globexp1 with the new pattern.
241 * If it fails then it tries to glob the rest of the pattern and returns.
242 */
243 static int
globexp2(const Char * ptr,const Char * pattern,glob_t * pglob,struct glob_lim * limitp)244 globexp2(const Char *ptr, const Char *pattern, glob_t *pglob,
245 struct glob_lim *limitp)
246 {
247 int i, rv;
248 Char *lm, *ls;
249 const Char *pe, *pm, *pl;
250 Char patbuf[MAXPATHLEN];
251
252 /* copy part up to the brace */
253 for (lm = patbuf, pm = pattern; pm != ptr; *lm++ = *pm++)
254 ;
255 *lm = EOS;
256 ls = lm;
257
258 /* Find the balanced brace */
259 for (i = 0, pe = ++ptr; *pe; pe++)
260 if (*pe == LBRACKET) {
261 /* Ignore everything between [] */
262 for (pm = pe++; *pe != RBRACKET && *pe != EOS; pe++)
263 ;
264 if (*pe == EOS) {
265 /*
266 * We could not find a matching RBRACKET.
267 * Ignore and just look for RBRACE
268 */
269 pe = pm;
270 }
271 } else if (*pe == LBRACE)
272 i++;
273 else if (*pe == RBRACE) {
274 if (i == 0)
275 break;
276 i--;
277 }
278
279 /* Non matching braces; just glob the pattern */
280 if (i != 0 || *pe == EOS)
281 return glob0(patbuf, pglob, limitp);
282
283 for (i = 0, pl = pm = ptr; pm <= pe; pm++) {
284 switch (*pm) {
285 case LBRACKET:
286 /* Ignore everything between [] */
287 for (pl = pm++; *pm != RBRACKET && *pm != EOS; pm++)
288 ;
289 if (*pm == EOS) {
290 /*
291 * We could not find a matching RBRACKET.
292 * Ignore and just look for RBRACE
293 */
294 pm = pl;
295 }
296 break;
297
298 case LBRACE:
299 i++;
300 break;
301
302 case RBRACE:
303 if (i) {
304 i--;
305 break;
306 }
307 /* FALLTHROUGH */
308 case COMMA:
309 if (i && *pm == COMMA)
310 break;
311 else {
312 /* Append the current string */
313 for (lm = ls; (pl < pm); *lm++ = *pl++)
314 ;
315
316 /*
317 * Append the rest of the pattern after the
318 * closing brace
319 */
320 for (pl = pe + 1; (*lm++ = *pl++) != EOS; )
321 ;
322
323 /* Expand the current pattern */
324 #ifdef DEBUG
325 qprintf("globexp2:", patbuf);
326 #endif
327 rv = globexp1(patbuf, pglob, limitp);
328 if (rv && rv != GLOB_NOMATCH)
329 return rv;
330
331 /* move after the comma, to the next string */
332 pl = pm + 1;
333 }
334 break;
335
336 default:
337 break;
338 }
339 }
340 return 0;
341 }
342
343
344
345 /*
346 * expand tilde from the passwd file.
347 */
348 static const Char *
globtilde(const Char * pattern,Char * patbuf,size_t patbuf_len,glob_t * pglob)349 globtilde(const Char *pattern, Char *patbuf, size_t patbuf_len, glob_t *pglob)
350 {
351 struct passwd *pwd;
352 char *h;
353 const Char *p;
354 Char *b, *eb;
355
356 if (*pattern != TILDE || !(pglob->gl_flags & GLOB_TILDE))
357 return pattern;
358
359 /* Copy up to the end of the string or / */
360 eb = &patbuf[patbuf_len - 1];
361 for (p = pattern + 1, h = (char *) patbuf;
362 h < (char *)eb && *p && *p != SLASH; *h++ = *p++)
363 ;
364
365 *h = EOS;
366
367 #if 0
368 if (h == (char *)eb)
369 return what;
370 #endif
371
372 if (((char *) patbuf)[0] == EOS) {
373 /*
374 * handle a plain ~ or ~/ by expanding $HOME
375 * first and then trying the password file
376 */
377 #if 0
378 if (issetugid() != 0 || (h = getenv("HOME")) == NULL) {
379 #endif
380 if ((getuid() != geteuid()) || (h = getenv("HOME")) == NULL) {
381 if ((pwd = getpwuid(getuid())) == NULL)
382 return pattern;
383 else
384 h = pwd->pw_dir;
385 }
386 } else {
387 /*
388 * Expand a ~user
389 */
390 if ((pwd = getpwnam((char*) patbuf)) == NULL)
391 return pattern;
392 else
393 h = pwd->pw_dir;
394 }
395
396 /* Copy the home directory */
397 for (b = patbuf; b < eb && *h; *b++ = *h++)
398 ;
399
400 /* Append the rest of the pattern */
401 while (b < eb && (*b++ = *p++) != EOS)
402 ;
403 *b = EOS;
404
405 return patbuf;
406 }
407
408 static int
409 g_strncmp(const Char *s1, const char *s2, size_t n)
410 {
411 int rv = 0;
412
413 while (n--) {
414 rv = *(Char *)s1 - *(const unsigned char *)s2++;
415 if (rv)
416 break;
417 if (*s1++ == '\0')
418 break;
419 }
420 return rv;
421 }
422
423 static int
424 g_charclass(const Char **patternp, Char **bufnextp)
425 {
426 const Char *pattern = *patternp + 1;
427 Char *bufnext = *bufnextp;
428 const Char *colon;
429 struct cclass *cc;
430 size_t len;
431
432 if ((colon = g_strchr(pattern, ':')) == NULL || colon[1] != ']')
433 return 1; /* not a character class */
434
435 len = (size_t)(colon - pattern);
436 for (cc = cclasses; cc->name != NULL; cc++) {
437 if (!g_strncmp(pattern, cc->name, len) && cc->name[len] == '\0')
438 break;
439 }
440 if (cc->name == NULL)
441 return -1; /* invalid character class */
442 *bufnext++ = M_CLASS;
443 *bufnext++ = (Char)(cc - &cclasses[0]);
444 *bufnextp = bufnext;
445 *patternp += len + 3;
446
447 return 0;
448 }
449
450 /*
451 * The main glob() routine: compiles the pattern (optionally processing
452 * quotes), calls glob1() to do the real pattern matching, and finally
453 * sorts the list (unless unsorted operation is requested). Returns 0
454 * if things went well, nonzero if errors occurred. It is not an error
455 * to find no matches.
456 */
457 static int
458 glob0(const Char *pattern, glob_t *pglob, struct glob_lim *limitp)
459 {
460 const Char *qpatnext;
461 int c, err, oldpathc;
462 Char *bufnext, patbuf[MAXPATHLEN];
463
464 qpatnext = globtilde(pattern, patbuf, MAXPATHLEN, pglob);
465 oldpathc = pglob->gl_pathc;
466 bufnext = patbuf;
467
468 /* We don't need to check for buffer overflow any more. */
469 while ((c = *qpatnext++) != EOS) {
470 switch (c) {
471 case LBRACKET:
472 c = *qpatnext;
473 if (c == NOT)
474 ++qpatnext;
475 if (*qpatnext == EOS ||
476 g_strchr(qpatnext+1, RBRACKET) == NULL) {
477 *bufnext++ = LBRACKET;
478 if (c == NOT)
479 --qpatnext;
480 break;
481 }
482 *bufnext++ = M_SET;
483 if (c == NOT)
484 *bufnext++ = M_NOT;
485 c = *qpatnext++;
486 do {
487 if (c == LBRACKET && *qpatnext == ':') {
488 do {
489 err = g_charclass(&qpatnext,
490 &bufnext);
491 if (err)
492 break;
493 c = *qpatnext++;
494 } while (c == LBRACKET && *qpatnext == ':');
495 if (err == -1 &&
496 !(pglob->gl_flags & GLOB_NOCHECK))
497 return GLOB_NOMATCH;
498 if (c == RBRACKET)
499 break;
500 }
501 *bufnext++ = CHAR(c);
502 if (*qpatnext == RANGE &&
503 (c = qpatnext[1]) != RBRACKET) {
504 *bufnext++ = M_RNG;
505 *bufnext++ = CHAR(c);
506 qpatnext += 2;
507 }
508 } while ((c = *qpatnext++) != RBRACKET);
509 pglob->gl_flags |= GLOB_MAGCHAR;
510 *bufnext++ = M_END;
511 break;
512 case QUESTION:
513 pglob->gl_flags |= GLOB_MAGCHAR;
514 *bufnext++ = M_ONE;
515 break;
516 case STAR:
517 pglob->gl_flags |= GLOB_MAGCHAR;
518 /* collapse adjacent stars to one,
519 * to avoid exponential behavior
520 */
521 if (bufnext == patbuf || bufnext[-1] != M_ALL)
522 *bufnext++ = M_ALL;
523 break;
524 default:
525 *bufnext++ = CHAR(c);
526 break;
527 }
528 }
529 *bufnext = EOS;
530 #ifdef DEBUG
531 qprintf("glob0:", patbuf);
532 #endif
533
534 if ((err = glob1(patbuf, patbuf+MAXPATHLEN-1, pglob, limitp)) != 0)
535 return(err);
536
537 /*
538 * If there was no match we are going to append the pattern
539 * if GLOB_NOCHECK was specified or if GLOB_NOMAGIC was specified
540 * and the pattern did not contain any magic characters
541 * GLOB_NOMAGIC is there just for compatibility with csh.
542 */
543 if (pglob->gl_pathc == oldpathc) {
544 if ((pglob->gl_flags & GLOB_NOCHECK) ||
545 ((pglob->gl_flags & GLOB_NOMAGIC) &&
546 !(pglob->gl_flags & GLOB_MAGCHAR)))
547 return(globextend(pattern, pglob, limitp, NULL));
548 else
549 return(GLOB_NOMATCH);
550 }
551 if (!(pglob->gl_flags & GLOB_NOSORT))
552 qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc,
553 pglob->gl_pathc - oldpathc, sizeof(char *), compare);
554 return(0);
555 }
556
557 static int
558 compare(const void *p, const void *q)
559 {
560 return(strcmp(*(char **)p, *(char **)q));
561 }
562
563 static int
564 glob1(Char *pattern, Char *pattern_last, glob_t *pglob, struct glob_lim *limitp)
565 {
566 Char pathbuf[MAXPATHLEN];
567
568 /* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */
569 if (*pattern == EOS)
570 return(0);
571 return(glob2(pathbuf, pathbuf+MAXPATHLEN-1,
572 pathbuf, pathbuf+MAXPATHLEN-1,
573 pattern, pattern_last, pglob, limitp));
574 }
575
576 /*
577 * The functions glob2 and glob3 are mutually recursive; there is one level
578 * of recursion for each segment in the pattern that contains one or more
579 * meta characters.
580 */
581 static int
582 glob2(Char *pathbuf, Char *pathbuf_last, Char *pathend, Char *pathend_last,
583 Char *pattern, Char *pattern_last, glob_t *pglob, struct glob_lim *limitp)
584 {
585 struct stat sb;
586 Char *p, *q;
587 int anymeta;
588
589 /*
590 * Loop over pattern segments until end of pattern or until
591 * segment with meta character found.
592 */
593 for (anymeta = 0;;) {
594 if (*pattern == EOS) { /* End of pattern? */
595 *pathend = EOS;
596 if (g_lstat(pathbuf, &sb, pglob))
597 return(0);
598
599 if ((pglob->gl_flags & GLOB_LIMIT) &&
600 limitp->glim_stat++ >= GLOB_LIMIT_STAT) {
601 errno = 0;
602 *pathend++ = SEP;
603 *pathend = EOS;
604 return(GLOB_NOSPACE);
605 }
606
607 if (((pglob->gl_flags & GLOB_MARK) &&
608 pathend[-1] != SEP) && (S_ISDIR(sb.st_mode) ||
609 (S_ISLNK(sb.st_mode) &&
610 (g_stat(pathbuf, &sb, pglob) == 0) &&
611 S_ISDIR(sb.st_mode)))) {
612 if (pathend+1 > pathend_last)
613 return (1);
614 *pathend++ = SEP;
615 *pathend = EOS;
616 }
617 ++pglob->gl_matchc;
618 return(globextend(pathbuf, pglob, limitp, &sb));
619 }
620
621 /* Find end of next segment, copy tentatively to pathend. */
622 q = pathend;
623 p = pattern;
624 while (*p != EOS && *p != SEP) {
625 if (ismeta(*p))
626 anymeta = 1;
627 if (q+1 > pathend_last)
628 return (1);
629 *q++ = *p++;
630 }
631
632 if (!anymeta) { /* No expansion, do next segment. */
633 pathend = q;
634 pattern = p;
635 while (*pattern == SEP) {
636 if (pathend+1 > pathend_last)
637 return (1);
638 *pathend++ = *pattern++;
639 }
640 } else
641 /* Need expansion, recurse. */
642 return(glob3(pathbuf, pathbuf_last, pathend,
643 pathend_last, pattern, p, pattern_last,
644 pglob, limitp));
645 }
646 /* NOTREACHED */
647 }
648
649 static int
650 glob3(Char *pathbuf, Char *pathbuf_last, Char *pathend, Char *pathend_last,
651 Char *pattern, Char *restpattern, Char *restpattern_last, glob_t *pglob,
652 struct glob_lim *limitp)
653 {
654 struct dirent *dp;
655 DIR *dirp;
656 int err;
657 char buf[MAXPATHLEN];
658
659 /*
660 * The readdirfunc declaration can't be prototyped, because it is
661 * assigned, below, to two functions which are prototyped in glob.h
662 * and dirent.h as taking pointers to differently typed opaque
663 * structures.
664 */
665 struct dirent *(*readdirfunc)(void *);
666
667 if (pathend > pathend_last)
668 return (1);
669 *pathend = EOS;
670 errno = 0;
671
672 if ((dirp = g_opendir(pathbuf, pglob)) == NULL) {
673 /* TODO: don't call for ENOENT or ENOTDIR? */
674 if (pglob->gl_errfunc) {
675 if (g_Ctoc(pathbuf, buf, sizeof(buf)))
676 return(GLOB_ABORTED);
677 if (pglob->gl_errfunc(buf, errno) ||
678 pglob->gl_flags & GLOB_ERR)
679 return(GLOB_ABORTED);
680 }
681 return(0);
682 }
683
684 err = 0;
685
686 /* Search directory for matching names. */
687 if (pglob->gl_flags & GLOB_ALTDIRFUNC)
688 readdirfunc = pglob->gl_readdir;
689 else
690 readdirfunc = (struct dirent *(*)(void *))readdir;
691 while ((dp = (*readdirfunc)(dirp))) {
692 u_char *sc;
693 Char *dc;
694
695 if ((pglob->gl_flags & GLOB_LIMIT) &&
696 limitp->glim_readdir++ >= GLOB_LIMIT_READDIR) {
697 errno = 0;
698 *pathend++ = SEP;
699 *pathend = EOS;
700 return(GLOB_NOSPACE);
701 }
702
703 /* Initial DOT must be matched literally. */
704 if (dp->d_name[0] == DOT && *pattern != DOT)
705 continue;
706 dc = pathend;
707 sc = (u_char *) dp->d_name;
708 while (dc < pathend_last && (*dc++ = *sc++) != EOS)
709 ;
710 if (dc >= pathend_last) {
711 *dc = EOS;
712 err = 1;
713 break;
714 }
715
716 if (!match(pathend, pattern, restpattern)) {
717 *pathend = EOS;
718 continue;
719 }
720 err = glob2(pathbuf, pathbuf_last, --dc, pathend_last,
721 restpattern, restpattern_last, pglob, limitp);
722 if (err)
723 break;
724 }
725
726 if (pglob->gl_flags & GLOB_ALTDIRFUNC)
727 (*pglob->gl_closedir)(dirp);
728 else
729 closedir(dirp);
730 return(err);
731 }
732
733
734 /*
735 * Extend the gl_pathv member of a glob_t structure to accommodate a new item,
736 * add the new item, and update gl_pathc.
737 *
738 * This assumes the BSD realloc, which only copies the block when its size
739 * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
740 * behavior.
741 *
742 * Return 0 if new item added, error code if memory couldn't be allocated.
743 *
744 * Invariant of the glob_t structure:
745 * Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
746 * gl_pathv points to (gl_offs + gl_pathc + 1) items.
747 */
748 static int
749 globextend(const Char *path, glob_t *pglob, struct glob_lim *limitp,
750 struct stat *sb)
751 {
752 char **pathv;
753 ssize_t i;
754 size_t newn, len;
755 char *copy = NULL;
756 const Char *p;
757 struct stat **statv;
758
759 newn = 2 + pglob->gl_pathc + pglob->gl_offs;
760 if (pglob->gl_offs >= INT_MAX ||
761 pglob->gl_pathc >= INT_MAX ||
762 newn >= INT_MAX ||
763 SIZE_MAX / sizeof(*pathv) <= newn ||
764 SIZE_MAX / sizeof(*statv) <= newn) {
765 nospace:
766 for (i = pglob->gl_offs; i < (ssize_t)(newn - 2); i++) {
767 if (pglob->gl_pathv && pglob->gl_pathv[i])
768 free(pglob->gl_pathv[i]);
769 if ((pglob->gl_flags & GLOB_KEEPSTAT) != 0 &&
770 pglob->gl_pathv && pglob->gl_pathv[i])
771 free(pglob->gl_statv[i]);
772 }
773 if (pglob->gl_pathv) {
774 free(pglob->gl_pathv);
775 pglob->gl_pathv = NULL;
776 }
777 if (pglob->gl_statv) {
778 free(pglob->gl_statv);
779 pglob->gl_statv = NULL;
780 }
781 return(GLOB_NOSPACE);
782 }
783
784 pathv = realloc(pglob->gl_pathv, newn * sizeof(*pathv));
785 if (pathv == NULL)
786 goto nospace;
787 if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
788 /* first time around -- clear initial gl_offs items */
789 pathv += pglob->gl_offs;
790 for (i = pglob->gl_offs; --i >= 0; )
791 *--pathv = NULL;
792 }
793 pglob->gl_pathv = pathv;
794
795 if ((pglob->gl_flags & GLOB_KEEPSTAT) != 0) {
796 statv = realloc(pglob->gl_statv, newn * sizeof(*statv));
797 if (statv == NULL)
798 goto nospace;
799 if (pglob->gl_statv == NULL && pglob->gl_offs > 0) {
800 /* first time around -- clear initial gl_offs items */
801 statv += pglob->gl_offs;
802 for (i = pglob->gl_offs; --i >= 0; )
803 *--statv = NULL;
804 }
805 pglob->gl_statv = statv;
806 if (sb == NULL)
807 statv[pglob->gl_offs + pglob->gl_pathc] = NULL;
808 else {
809 limitp->glim_malloc += sizeof(**statv);
810 if ((pglob->gl_flags & GLOB_LIMIT) &&
811 limitp->glim_malloc >= GLOB_LIMIT_MALLOC) {
812 errno = 0;
813 return(GLOB_NOSPACE);
814 }
815 if ((statv[pglob->gl_offs + pglob->gl_pathc] =
816 malloc(sizeof(**statv))) == NULL)
817 goto copy_error;
818 memcpy(statv[pglob->gl_offs + pglob->gl_pathc], sb,
819 sizeof(*sb));
820 }
821 statv[pglob->gl_offs + pglob->gl_pathc + 1] = NULL;
822 }
823
824 for (p = path; *p++;)
825 ;
826 len = (size_t)(p - path);
827 limitp->glim_malloc += len;
828 if ((copy = malloc(len)) != NULL) {
829 if (g_Ctoc(path, copy, len)) {
830 free(copy);
831 return(GLOB_NOSPACE);
832 }
833 pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
834 }
835 pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
836
837 if ((pglob->gl_flags & GLOB_LIMIT) &&
838 (newn * sizeof(*pathv)) + limitp->glim_malloc >
839 GLOB_LIMIT_MALLOC) {
840 errno = 0;
841 return(GLOB_NOSPACE);
842 }
843 copy_error:
844 return(copy == NULL ? GLOB_NOSPACE : 0);
845 }
846
847
848 /*
849 * pattern matching function for filenames. Each occurrence of the *
850 * pattern causes a recursion level.
851 */
852 static int
853 match(Char *name, Char *pat, Char *patend)
854 {
855 int ok, negate_range;
856 Char c, k;
857
858 while (pat < patend) {
859 c = *pat++;
860 switch (c & M_MASK) {
861 case M_ALL:
862 if (pat == patend)
863 return(1);
864 do {
865 if (match(name, pat, patend))
866 return(1);
867 } while (*name++ != EOS);
868 return(0);
869 case M_ONE:
870 if (*name++ == EOS)
871 return(0);
872 break;
873 case M_SET:
874 ok = 0;
875 if ((k = *name++) == EOS)
876 return(0);
877 if ((negate_range = ((*pat & M_MASK) == M_NOT)) != EOS)
878 ++pat;
879 while (((c = *pat++) & M_MASK) != M_END) {
880 if ((c & M_MASK) == M_CLASS) {
881 Char idx = *pat & M_MASK;
882 if (idx < NCCLASSES &&
883 cclasses[idx].isctype(k))
884 ok = 1;
885 ++pat;
886 }
887 if ((*pat & M_MASK) == M_RNG) {
888 if (c <= k && k <= pat[1])
889 ok = 1;
890 pat += 2;
891 } else if (c == k)
892 ok = 1;
893 }
894 if (ok == negate_range)
895 return(0);
896 break;
897 default:
898 if (*name++ != c)
899 return(0);
900 break;
901 }
902 }
903 return(*name == EOS);
904 }
905
906 /* Free allocated data belonging to a glob_t structure. */
907 void
908 globfree(glob_t *pglob)
909 {
910 int i;
911 char **pp;
912
913 if (pglob->gl_pathv != NULL) {
914 pp = pglob->gl_pathv + pglob->gl_offs;
915 for (i = pglob->gl_pathc; i--; ++pp)
916 if (*pp)
917 free(*pp);
918 free(pglob->gl_pathv);
919 pglob->gl_pathv = NULL;
920 }
921 if (pglob->gl_statv != NULL) {
922 for (i = 0; i < pglob->gl_pathc; i++) {
923 if (pglob->gl_statv[i] != NULL)
924 free(pglob->gl_statv[i]);
925 }
926 free(pglob->gl_statv);
927 pglob->gl_statv = NULL;
928 }
929 }
930
931 static DIR *
932 g_opendir(Char *str, glob_t *pglob)
933 {
934 char buf[MAXPATHLEN];
935
936 if (!*str)
937 strlcpy(buf, ".", sizeof buf);
938 else {
939 if (g_Ctoc(str, buf, sizeof(buf)))
940 return(NULL);
941 }
942
943 if (pglob->gl_flags & GLOB_ALTDIRFUNC)
944 return((*pglob->gl_opendir)(buf));
945
946 return(opendir(buf));
947 }
948
949 static int
950 g_lstat(Char *fn, struct stat *sb, glob_t *pglob)
951 {
952 char buf[MAXPATHLEN];
953
954 if (g_Ctoc(fn, buf, sizeof(buf)))
955 return(-1);
956 if (pglob->gl_flags & GLOB_ALTDIRFUNC)
957 return((*pglob->gl_lstat)(buf, sb));
958 return(lstat(buf, sb));
959 }
960
961 static int
962 g_stat(Char *fn, struct stat *sb, glob_t *pglob)
963 {
964 char buf[MAXPATHLEN];
965
966 if (g_Ctoc(fn, buf, sizeof(buf)))
967 return(-1);
968 if (pglob->gl_flags & GLOB_ALTDIRFUNC)
969 return((*pglob->gl_stat)(buf, sb));
970 return(stat(buf, sb));
971 }
972
973 static Char *
974 g_strchr(const Char *str, int ch)
975 {
976 do {
977 if (*str == ch)
978 return ((Char *)str);
979 } while (*str++);
980 return (NULL);
981 }
982
983 static int
984 g_Ctoc(const Char *str, char *buf, u_int len)
985 {
986
987 while (len--) {
988 if ((*buf++ = *str++) == EOS)
989 return (0);
990 }
991 return (1);
992 }
993
994 #ifdef DEBUG
995 static void
996 qprintf(const char *str, Char *s)
997 {
998 Char *p;
999
1000 (void)printf("%s:\n", str);
1001 for (p = s; *p; p++)
1002 (void)printf("%c", CHAR(*p));
1003 (void)printf("\n");
1004 for (p = s; *p; p++)
1005 (void)printf("%c", *p & M_PROTECT ? '"' : ' ');
1006 (void)printf("\n");
1007 for (p = s; *p; p++)
1008 (void)printf("%c", ismeta(*p) ? '_' : ' ');
1009 (void)printf("\n");
1010 }
1011 #endif
1012
1013 #endif /* !defined(HAVE_GLOB) || !defined(GLOB_HAS_ALTDIRFUNC) ||
1014 !defined(GLOB_HAS_GL_MATCHC) || !defined(GLOB_HAS_GL_STATV) */
1015