1 /* $NetBSD: glob.c,v 1.35 2013/03/20 23:44:47 lukem Exp $ */
2
3 /*
4 * Copyright (c) 1989, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Guido van Rossum.
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. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35 #include <sys/cdefs.h>
36 #if defined(LIBC_SCCS) && !defined(lint)
37 #if 0
38 static char sccsid[] = "@(#)glob.c 8.3 (Berkeley) 10/13/93";
39 #else
40 __RCSID("$NetBSD: glob.c,v 1.35 2013/03/20 23:44:47 lukem Exp $");
41 #endif
42 #endif /* LIBC_SCCS and not lint */
43
44 /*
45 * glob(3) -- a superset of the one defined in POSIX 1003.2.
46 *
47 * The [!...] convention to negate a range is supported (SysV, Posix, ksh).
48 *
49 * Optional extra services, controlled by flags not defined by POSIX:
50 *
51 * GLOB_MAGCHAR:
52 * Set in gl_flags if pattern contained a globbing character.
53 * GLOB_NOMAGIC:
54 * Same as GLOB_NOCHECK, but it will only append pattern if it did
55 * not contain any magic characters. [Used in csh style globbing]
56 * GLOB_ALTDIRFUNC:
57 * Use alternately specified directory access functions.
58 * GLOB_TILDE:
59 * expand ~user/foo to the /home/dir/of/user/foo
60 * GLOB_BRACE:
61 * expand {1,2}{a,b} to 1a 1b 2a 2b
62 * GLOB_PERIOD:
63 * allow metacharacters to match leading dots in filenames.
64 * GLOB_NO_DOTDIRS:
65 * . and .. are hidden from wildcards, even if GLOB_PERIOD is set.
66 * gl_matchc:
67 * Number of matches in the current invocation of glob.
68 */
69
70 #include "namespace.h"
71 #include <sys/param.h>
72 #include <sys/stat.h>
73
74 #include <assert.h>
75 #include <ctype.h>
76 #include <dirent.h>
77 #include <errno.h>
78 #include <glob.h>
79 #include <pwd.h>
80 #include <stdio.h>
81 #include <stddef.h>
82 #include <stdlib.h>
83 #include <string.h>
84 #include <unistd.h>
85
86 #ifdef HAVE_NBTOOL_CONFIG_H
87 #define NO_GETPW_R
88 #endif
89
90 #define GLOB_LIMIT_STRING 65536 /* number of readdirs */
91 #define GLOB_LIMIT_STAT 128 /* number of stat system calls */
92 #define GLOB_LIMIT_READDIR 16384 /* total buffer size of path strings */
93 #define GLOB_LIMIT_PATH 1024 /* number of path elements */
94 #define GLOB_LIMIT_BRACE 128 /* Number of brace calls */
95
96 struct glob_limit {
97 size_t l_string;
98 size_t l_stat;
99 size_t l_readdir;
100 size_t l_brace;
101 };
102
103 /*
104 * XXX: For NetBSD 1.4.x compatibility. (kill me l8r)
105 */
106 #ifndef _DIAGASSERT
107 #define _DIAGASSERT(a)
108 #endif
109
110 #define DOLLAR '$'
111 #define DOT '.'
112 #define EOS '\0'
113 #define LBRACKET '['
114 #define NOT '!'
115 #define QUESTION '?'
116 #define QUOTE '\\'
117 #define RANGE '-'
118 #define RBRACKET ']'
119 #define SEP '/'
120 #define STAR '*'
121 #define TILDE '~'
122 #define UNDERSCORE '_'
123 #define LBRACE '{'
124 #define RBRACE '}'
125 #define SLASH '/'
126 #define COMMA ','
127
128 #ifndef USE_8BIT_CHARS
129
130 #define M_QUOTE 0x8000
131 #define M_PROTECT 0x4000
132 #define M_MASK 0xffff
133 #define M_ASCII 0x00ff
134
135 typedef unsigned short Char;
136
137 #else
138
139 #define M_QUOTE (Char)0x80
140 #define M_PROTECT (Char)0x40
141 #define M_MASK (Char)0xff
142 #define M_ASCII (Char)0x7f
143
144 typedef char Char;
145
146 #endif
147
148
149 #define CHAR(c) ((Char)((c)&M_ASCII))
150 #define META(c) ((Char)((c)|M_QUOTE))
151 #define M_ALL META('*')
152 #define M_END META(']')
153 #define M_NOT META('!')
154 #define M_ONE META('?')
155 #define M_RNG META('-')
156 #define M_SET META('[')
157 #define ismeta(c) (((c)&M_QUOTE) != 0)
158
159
160 static int compare(const void *, const void *);
161 static int g_Ctoc(const Char *, char *, size_t);
162 static int g_lstat(Char *, __gl_stat_t *, glob_t *);
163 static DIR *g_opendir(Char *, glob_t *);
164 static Char *g_strchr(const Char *, int);
165 static int g_stat(Char *, __gl_stat_t *, glob_t *);
166 static int glob0(const Char *, glob_t *, struct glob_limit *);
167 static int glob1(Char *, glob_t *, struct glob_limit *);
168 static int glob2(Char *, Char *, Char *, const Char *, glob_t *,
169 struct glob_limit *);
170 static int glob3(Char *, Char *, Char *, const Char *, const Char *,
171 const Char *, glob_t *, struct glob_limit *);
172 static int globextend(const Char *, glob_t *, struct glob_limit *);
173 static const Char *globtilde(const Char *, Char *, size_t, glob_t *);
174 static int globexp1(const Char *, glob_t *, struct glob_limit *);
175 static int globexp2(const Char *, const Char *, glob_t *, int *,
176 struct glob_limit *);
177 static int match(const Char *, const Char *, const Char *);
178 #ifdef DEBUG
179 static void qprintf(const char *, Char *);
180 #endif
181
182 int
glob(const char * __restrict pattern,int flags,int (* errfunc)(const char *,int),glob_t * __restrict pglob)183 glob(const char * __restrict pattern, int flags, int (*errfunc)(const char *,
184 int), glob_t * __restrict pglob)
185 {
186 const unsigned char *patnext;
187 int c;
188 Char *bufnext, *bufend, patbuf[MAXPATHLEN+1];
189 struct glob_limit limit = { 0, 0, 0, 0 };
190
191 _DIAGASSERT(pattern != NULL);
192
193 patnext = (const unsigned char *) pattern;
194 if (!(flags & GLOB_APPEND)) {
195 pglob->gl_pathc = 0;
196 pglob->gl_pathv = NULL;
197 if (!(flags & GLOB_DOOFFS))
198 pglob->gl_offs = 0;
199 }
200 pglob->gl_flags = flags & ~GLOB_MAGCHAR;
201 pglob->gl_errfunc = errfunc;
202 pglob->gl_matchc = 0;
203
204 bufnext = patbuf;
205 bufend = bufnext + MAXPATHLEN;
206 if (flags & GLOB_NOESCAPE) {
207 while (bufnext < bufend && (c = *patnext++) != EOS)
208 *bufnext++ = c;
209 } else {
210 /* Protect the quoted characters. */
211 while (bufnext < bufend && (c = *patnext++) != EOS)
212 if (c == QUOTE) {
213 if ((c = *patnext++) == EOS) {
214 c = QUOTE;
215 --patnext;
216 }
217 *bufnext++ = c | M_PROTECT;
218 }
219 else
220 *bufnext++ = c;
221 }
222 *bufnext = EOS;
223
224 if (flags & GLOB_BRACE)
225 return globexp1(patbuf, pglob, &limit);
226 else
227 return glob0(patbuf, pglob, &limit);
228 }
229
230 /*
231 * Expand recursively a glob {} pattern. When there is no more expansion
232 * invoke the standard globbing routine to glob the rest of the magic
233 * characters
234 */
235 static int
globexp1(const Char * pattern,glob_t * pglob,struct glob_limit * limit)236 globexp1(const Char *pattern, glob_t *pglob, struct glob_limit *limit)
237 {
238 const Char* ptr = pattern;
239 int rv;
240
241 _DIAGASSERT(pattern != NULL);
242 _DIAGASSERT(pglob != NULL);
243
244 if ((pglob->gl_flags & GLOB_LIMIT) &&
245 limit->l_brace++ >= GLOB_LIMIT_BRACE) {
246 errno = 0;
247 return GLOB_NOSPACE;
248 }
249
250 /* Protect a single {}, for find(1), like csh */
251 if (pattern[0] == LBRACE && pattern[1] == RBRACE && pattern[2] == EOS)
252 return glob0(pattern, pglob, limit);
253
254 while ((ptr = (const Char *) g_strchr(ptr, LBRACE)) != NULL)
255 if (!globexp2(ptr, pattern, pglob, &rv, limit))
256 return rv;
257
258 return glob0(pattern, pglob, limit);
259 }
260
261
262 /*
263 * Recursive brace globbing helper. Tries to expand a single brace.
264 * If it succeeds then it invokes globexp1 with the new pattern.
265 * If it fails then it tries to glob the rest of the pattern and returns.
266 */
267 static int
globexp2(const Char * ptr,const Char * pattern,glob_t * pglob,int * rv,struct glob_limit * limit)268 globexp2(const Char *ptr, const Char *pattern, glob_t *pglob, int *rv,
269 struct glob_limit *limit)
270 {
271 int i;
272 Char *lm, *ls;
273 const Char *pe, *pm, *pl;
274 Char patbuf[MAXPATHLEN + 1];
275
276 _DIAGASSERT(ptr != NULL);
277 _DIAGASSERT(pattern != NULL);
278 _DIAGASSERT(pglob != NULL);
279 _DIAGASSERT(rv != NULL);
280
281 /* copy part up to the brace */
282 for (lm = patbuf, pm = pattern; pm != ptr; *lm++ = *pm++)
283 continue;
284 ls = lm;
285
286 /* Find the balanced brace */
287 for (i = 0, pe = ++ptr; *pe; pe++)
288 if (*pe == LBRACKET) {
289 /* Ignore everything between [] */
290 for (pm = pe++; *pe != RBRACKET && *pe != EOS; pe++)
291 continue;
292 if (*pe == EOS) {
293 /*
294 * We could not find a matching RBRACKET.
295 * Ignore and just look for RBRACE
296 */
297 pe = pm;
298 }
299 }
300 else if (*pe == LBRACE)
301 i++;
302 else if (*pe == RBRACE) {
303 if (i == 0)
304 break;
305 i--;
306 }
307
308 /* Non matching braces; just glob the pattern */
309 if (i != 0 || *pe == EOS) {
310 /*
311 * we use `pattern', not `patbuf' here so that that
312 * unbalanced braces are passed to the match
313 */
314 *rv = glob0(pattern, pglob, limit);
315 return 0;
316 }
317
318 for (i = 0, pl = pm = ptr; pm <= pe; pm++) {
319 switch (*pm) {
320 case LBRACKET:
321 /* Ignore everything between [] */
322 for (pl = pm++; *pm != RBRACKET && *pm != EOS; pm++)
323 continue;
324 if (*pm == EOS) {
325 /*
326 * We could not find a matching RBRACKET.
327 * Ignore and just look for RBRACE
328 */
329 pm = pl;
330 }
331 break;
332
333 case LBRACE:
334 i++;
335 break;
336
337 case RBRACE:
338 if (i) {
339 i--;
340 break;
341 }
342 /* FALLTHROUGH */
343 case COMMA:
344 if (i && *pm == COMMA)
345 break;
346 else {
347 /* Append the current string */
348 for (lm = ls; (pl < pm); *lm++ = *pl++)
349 continue;
350 /*
351 * Append the rest of the pattern after the
352 * closing brace
353 */
354 for (pl = pe + 1; (*lm++ = *pl++) != EOS;)
355 continue;
356
357 /* Expand the current pattern */
358 #ifdef DEBUG
359 qprintf("globexp2", patbuf);
360 #endif
361 *rv = globexp1(patbuf, pglob, limit);
362
363 /* move after the comma, to the next string */
364 pl = pm + 1;
365 }
366 break;
367
368 default:
369 break;
370 }
371 }
372 *rv = 0;
373 return 0;
374 }
375
376
377
378 /*
379 * expand tilde from the passwd file.
380 */
381 static const Char *
globtilde(const Char * pattern,Char * patbuf,size_t patsize,glob_t * pglob)382 globtilde(const Char *pattern, Char *patbuf, size_t patsize, glob_t *pglob)
383 {
384 struct passwd *pwd;
385 const char *h;
386 const Char *p;
387 Char *b;
388 char *d;
389 Char *pend = &patbuf[patsize / sizeof(Char)];
390 #ifndef NO_GETPW_R
391 struct passwd pwres;
392 char pwbuf[1024];
393 #endif
394
395 pend--;
396
397 _DIAGASSERT(pattern != NULL);
398 _DIAGASSERT(patbuf != NULL);
399 _DIAGASSERT(pglob != NULL);
400
401 if (*pattern != TILDE || !(pglob->gl_flags & GLOB_TILDE))
402 return pattern;
403
404 /* Copy up to the end of the string or / */
405 for (p = pattern + 1, d = (char *)(void *)patbuf;
406 d < (char *)(void *)pend && *p && *p != SLASH;
407 *d++ = *p++)
408 continue;
409
410 if (d == (char *)(void *)pend)
411 return NULL;
412
413 *d = EOS;
414 d = (char *)(void *)patbuf;
415
416 if (*d == EOS) {
417 /*
418 * handle a plain ~ or ~/ by expanding $HOME
419 * first and then trying the password file
420 */
421 if ((h = getenv("HOME")) == NULL) {
422 #ifdef NO_GETPW_R
423 if ((pwd = getpwuid(getuid())) == NULL)
424 #else
425 if (getpwuid_r(getuid(), &pwres, pwbuf, sizeof(pwbuf),
426 &pwd) != 0 || pwd == NULL)
427 #endif
428 return pattern;
429 else
430 h = pwd->pw_dir;
431 }
432 }
433 else {
434 /*
435 * Expand a ~user
436 */
437 #ifdef NO_GETPW_R
438 if ((pwd = getpwnam(d)) == NULL)
439 #else
440 if (getpwnam_r(d, &pwres, pwbuf, sizeof(pwbuf), &pwd) != 0 ||
441 pwd == NULL)
442 #endif
443 return pattern;
444 else
445 h = pwd->pw_dir;
446 }
447
448 /* Copy the home directory */
449 for (b = patbuf; b < pend && *h; *b++ = *h++)
450 continue;
451
452 if (b == pend)
453 return NULL;
454
455 /* Append the rest of the pattern */
456 while (b < pend && (*b++ = *p++) != EOS)
457 continue;
458
459 if (b == pend)
460 return NULL;
461
462 return patbuf;
463 }
464
465
466 /*
467 * The main glob() routine: compiles the pattern (optionally processing
468 * quotes), calls glob1() to do the real pattern matching, and finally
469 * sorts the list (unless unsorted operation is requested). Returns 0
470 * if things went well, nonzero if errors occurred. It is not an error
471 * to find no matches.
472 */
473 static int
glob0(const Char * pattern,glob_t * pglob,struct glob_limit * limit)474 glob0(const Char *pattern, glob_t *pglob, struct glob_limit *limit)
475 {
476 const Char *qpatnext;
477 int c, error;
478 __gl_size_t oldpathc;
479 Char *bufnext, patbuf[MAXPATHLEN+1];
480
481 _DIAGASSERT(pattern != NULL);
482 _DIAGASSERT(pglob != NULL);
483
484 if ((qpatnext = globtilde(pattern, patbuf, sizeof(patbuf),
485 pglob)) == NULL)
486 return GLOB_ABEND;
487 oldpathc = pglob->gl_pathc;
488 bufnext = patbuf;
489
490 /* We don't need to check for buffer overflow any more. */
491 while ((c = *qpatnext++) != EOS) {
492 switch (c) {
493 case LBRACKET:
494 c = *qpatnext;
495 if (c == NOT)
496 ++qpatnext;
497 if (*qpatnext == EOS ||
498 g_strchr(qpatnext+1, RBRACKET) == NULL) {
499 *bufnext++ = LBRACKET;
500 if (c == NOT)
501 --qpatnext;
502 break;
503 }
504 *bufnext++ = M_SET;
505 if (c == NOT)
506 *bufnext++ = M_NOT;
507 c = *qpatnext++;
508 do {
509 *bufnext++ = CHAR(c);
510 if (*qpatnext == RANGE &&
511 (c = qpatnext[1]) != RBRACKET) {
512 *bufnext++ = M_RNG;
513 *bufnext++ = CHAR(c);
514 qpatnext += 2;
515 }
516 } while ((c = *qpatnext++) != RBRACKET);
517 pglob->gl_flags |= GLOB_MAGCHAR;
518 *bufnext++ = M_END;
519 break;
520 case QUESTION:
521 pglob->gl_flags |= GLOB_MAGCHAR;
522 *bufnext++ = M_ONE;
523 break;
524 case STAR:
525 pglob->gl_flags |= GLOB_MAGCHAR;
526 /* collapse adjacent stars to one [or three if globstar]
527 * to avoid exponential behavior
528 */
529 if (bufnext == patbuf || bufnext[-1] != M_ALL ||
530 ((pglob->gl_flags & GLOB_STAR) != 0 &&
531 (bufnext - 1 == patbuf || bufnext[-2] != M_ALL ||
532 bufnext - 2 == patbuf || bufnext[-3] != M_ALL)))
533 *bufnext++ = M_ALL;
534 break;
535 default:
536 *bufnext++ = CHAR(c);
537 break;
538 }
539 }
540 *bufnext = EOS;
541 #ifdef DEBUG
542 qprintf("glob0", patbuf);
543 #endif
544
545 if ((error = glob1(patbuf, pglob, limit)) != 0)
546 return error;
547
548 if (pglob->gl_pathc == oldpathc) {
549 /*
550 * If there was no match we are going to append the pattern
551 * if GLOB_NOCHECK was specified or if GLOB_NOMAGIC was
552 * specified and the pattern did not contain any magic
553 * characters GLOB_NOMAGIC is there just for compatibility
554 * with csh.
555 */
556 if ((pglob->gl_flags & GLOB_NOCHECK) ||
557 ((pglob->gl_flags & (GLOB_NOMAGIC|GLOB_MAGCHAR))
558 == GLOB_NOMAGIC)) {
559 return globextend(pattern, pglob, limit);
560 } else {
561 return GLOB_NOMATCH;
562 }
563 } else if (!(pglob->gl_flags & GLOB_NOSORT)) {
564 qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc,
565 (size_t)pglob->gl_pathc - oldpathc, sizeof(char *),
566 compare);
567 }
568
569 return 0;
570 }
571
572 static int
compare(const void * p,const void * q)573 compare(const void *p, const void *q)
574 {
575
576 _DIAGASSERT(p != NULL);
577 _DIAGASSERT(q != NULL);
578
579 return strcoll(*(const char * const *)p, *(const char * const *)q);
580 }
581
582 static int
glob1(Char * pattern,glob_t * pglob,struct glob_limit * limit)583 glob1(Char *pattern, glob_t *pglob, struct glob_limit *limit)
584 {
585 Char pathbuf[MAXPATHLEN+1];
586
587 _DIAGASSERT(pattern != NULL);
588 _DIAGASSERT(pglob != NULL);
589
590 /* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */
591 if (*pattern == EOS)
592 return 0;
593 /*
594 * we save one character so that we can use ptr >= limit,
595 * in the general case when we are appending non nul chars only.
596 */
597 return glob2(pathbuf, pathbuf,
598 pathbuf + (sizeof(pathbuf) / sizeof(*pathbuf)) - 1, pattern,
599 pglob, limit);
600 }
601
602 /*
603 * The functions glob2 and glob3 are mutually recursive; there is one level
604 * of recursion for each segment in the pattern that contains one or more
605 * meta characters.
606 */
607 static int
glob2(Char * pathbuf,Char * pathend,Char * pathlim,const Char * pattern,glob_t * pglob,struct glob_limit * limit)608 glob2(Char *pathbuf, Char *pathend, Char *pathlim, const Char *pattern,
609 glob_t *pglob, struct glob_limit *limit)
610 {
611 __gl_stat_t sb;
612 const Char *p;
613 Char *q;
614 int anymeta;
615
616 _DIAGASSERT(pathbuf != NULL);
617 _DIAGASSERT(pathend != NULL);
618 _DIAGASSERT(pattern != NULL);
619 _DIAGASSERT(pglob != NULL);
620
621 #ifdef DEBUG
622 qprintf("glob2", pathbuf);
623 #endif
624 /*
625 * Loop over pattern segments until end of pattern or until
626 * segment with meta character found.
627 */
628 for (anymeta = 0;;) {
629 if (*pattern == EOS) { /* End of pattern? */
630 *pathend = EOS;
631 if (g_lstat(pathbuf, &sb, pglob))
632 return 0;
633
634 if ((pglob->gl_flags & GLOB_LIMIT) &&
635 limit->l_stat++ >= GLOB_LIMIT_STAT) {
636 errno = 0;
637 *pathend++ = SEP;
638 *pathend = EOS;
639 return GLOB_NOSPACE;
640 }
641 if (((pglob->gl_flags & GLOB_MARK) &&
642 pathend[-1] != SEP) && (S_ISDIR(sb.st_mode) ||
643 (S_ISLNK(sb.st_mode) &&
644 (g_stat(pathbuf, &sb, pglob) == 0) &&
645 S_ISDIR(sb.st_mode)))) {
646 if (pathend >= pathlim)
647 return GLOB_ABORTED;
648 *pathend++ = SEP;
649 *pathend = EOS;
650 }
651 ++pglob->gl_matchc;
652 return globextend(pathbuf, pglob, limit);
653 }
654
655 /* Find end of next segment, copy tentatively to pathend. */
656 q = pathend;
657 p = pattern;
658 while (*p != EOS && *p != SEP) {
659 if (ismeta(*p))
660 anymeta = 1;
661 if (q >= pathlim)
662 return GLOB_ABORTED;
663 *q++ = *p++;
664 }
665
666 if (!anymeta) {
667 pathend = q;
668 pattern = p;
669 while (*pattern == SEP) {
670 if (pathend >= pathlim)
671 return GLOB_ABORTED;
672 *pathend++ = *pattern++;
673 }
674 } else /* Need expansion, recurse. */
675 return glob3(pathbuf, pathend, pathlim, pattern, p,
676 pattern, pglob, limit);
677 }
678 /* NOTREACHED */
679 }
680
681 static int
glob3(Char * pathbuf,Char * pathend,Char * pathlim,const Char * pattern,const Char * restpattern,const Char * pglobstar,glob_t * pglob,struct glob_limit * limit)682 glob3(Char *pathbuf, Char *pathend, Char *pathlim, const Char *pattern,
683 const Char *restpattern, const Char *pglobstar, glob_t *pglob,
684 struct glob_limit *limit)
685 {
686 struct dirent *dp;
687 DIR *dirp;
688 __gl_stat_t sbuf;
689 int error;
690 char buf[MAXPATHLEN];
691 int globstar = 0;
692 int chase_symlinks = 0;
693 const Char *termstar = NULL;
694
695 /*
696 * The readdirfunc declaration can't be prototyped, because it is
697 * assigned, below, to two functions which are prototyped in glob.h
698 * and dirent.h as taking pointers to differently typed opaque
699 * structures.
700 */
701 struct dirent *(*readdirfunc)(void *);
702
703 _DIAGASSERT(pathbuf != NULL);
704 _DIAGASSERT(pathend != NULL);
705 _DIAGASSERT(pattern != NULL);
706 _DIAGASSERT(restpattern != NULL);
707 _DIAGASSERT(pglob != NULL);
708
709 *pathend = EOS;
710 errno = 0;
711
712 while (pglobstar < restpattern) {
713 if ((pglobstar[0] & M_MASK) == M_ALL &&
714 (pglobstar[1] & M_MASK) == M_ALL) {
715 globstar = 1;
716 chase_symlinks = (pglobstar[2] & M_MASK) == M_ALL;
717 termstar = pglobstar + (2 + chase_symlinks);
718 break;
719 }
720 pglobstar++;
721 }
722
723 if (globstar) {
724 error = pglobstar == pattern && termstar == restpattern ?
725 *restpattern == EOS ?
726 glob2(pathbuf, pathend, pathlim, restpattern - 1, pglob,
727 limit) :
728 glob2(pathbuf, pathend, pathlim, restpattern + 1, pglob,
729 limit) :
730 glob3(pathbuf, pathend, pathlim, pattern, restpattern,
731 termstar, pglob, limit);
732 if (error)
733 return error;
734 *pathend = EOS;
735 }
736
737 if (*pathbuf && (g_lstat(pathbuf, &sbuf, pglob) ||
738 !S_ISDIR(sbuf.st_mode)
739 #ifdef S_IFLINK
740 && ((globstar && !chase_symlinks) || !S_ISLNK(sbuf.st_mode))
741 #endif
742 ))
743 return 0;
744
745 if ((dirp = g_opendir(pathbuf, pglob)) == NULL) {
746 if (pglob->gl_errfunc) {
747 if (g_Ctoc(pathbuf, buf, sizeof(buf)))
748 return GLOB_ABORTED;
749 if (pglob->gl_errfunc(buf, errno) ||
750 pglob->gl_flags & GLOB_ERR)
751 return GLOB_ABORTED;
752 }
753 /*
754 * Posix/XOpen: glob should return when it encounters a
755 * directory that it cannot open or read
756 * XXX: Should we ignore ENOTDIR and ENOENT though?
757 * I think that Posix had in mind EPERM...
758 */
759 if (pglob->gl_flags & GLOB_ERR)
760 return GLOB_ABORTED;
761
762 return 0;
763 }
764
765 error = 0;
766
767 /* Search directory for matching names. */
768 if (pglob->gl_flags & GLOB_ALTDIRFUNC)
769 readdirfunc = pglob->gl_readdir;
770 else
771 readdirfunc = (struct dirent *(*)(void *)) readdir;
772 while ((dp = (*readdirfunc)(dirp)) != NULL) {
773 unsigned char *sc;
774 Char *dc;
775
776 if ((pglob->gl_flags & GLOB_LIMIT) &&
777 limit->l_readdir++ >= GLOB_LIMIT_READDIR) {
778 errno = 0;
779 *pathend++ = SEP;
780 *pathend = EOS;
781 error = GLOB_NOSPACE;
782 break;
783 }
784
785 /*
786 * Initial DOT must be matched literally, unless we have
787 * GLOB_PERIOD set.
788 */
789 if ((pglob->gl_flags & GLOB_PERIOD) == 0)
790 if (dp->d_name[0] == DOT && *pattern != DOT)
791 continue;
792 /*
793 * If GLOB_NO_DOTDIRS is set, . and .. vanish.
794 */
795 if ((pglob->gl_flags & GLOB_NO_DOTDIRS) &&
796 (dp->d_name[0] == DOT) &&
797 ((dp->d_name[1] == EOS) ||
798 ((dp->d_name[1] == DOT) && (dp->d_name[2] == EOS))))
799 continue;
800 /*
801 * The resulting string contains EOS, so we can
802 * use the pathlim character, if it is the nul
803 */
804 for (sc = (unsigned char *) dp->d_name, dc = pathend;
805 dc <= pathlim && (*dc++ = *sc++) != EOS;)
806 continue;
807
808 /*
809 * Have we filled the buffer without seeing EOS?
810 */
811 if (dc > pathlim && *pathlim != EOS) {
812 /*
813 * Abort when requested by caller, otherwise
814 * reset pathend back to last SEP and continue
815 * with next dir entry.
816 */
817 if (pglob->gl_flags & GLOB_ERR) {
818 error = GLOB_ABORTED;
819 break;
820 }
821 else {
822 *pathend = EOS;
823 continue;
824 }
825 }
826
827 if (globstar) {
828 #ifdef S_IFLNK
829 if (!chase_symlinks &&
830 (g_lstat(pathbuf, &sbuf, pglob) ||
831 S_ISLNK(sbuf.st_mode)))
832 continue;
833 #endif
834
835 if (!match(pathend, pattern, termstar))
836 continue;
837
838 if (--dc < pathlim - 2)
839 *dc++ = SEP;
840 *dc = EOS;
841 error = glob2(pathbuf, dc, pathlim, pglobstar,
842 pglob, limit);
843 if (error)
844 break;
845 *pathend = EOS;
846 } else {
847 if (!match(pathend, pattern, restpattern)) {
848 *pathend = EOS;
849 continue;
850 }
851 error = glob2(pathbuf, --dc, pathlim, restpattern,
852 pglob, limit);
853 if (error)
854 break;
855 }
856 }
857 if (pglob->gl_flags & GLOB_ALTDIRFUNC)
858 (*pglob->gl_closedir)(dirp);
859 else
860 closedir(dirp);
861
862 /*
863 * Again Posix X/Open issue with regards to error handling.
864 */
865 if ((error || errno) && (pglob->gl_flags & GLOB_ERR))
866 return GLOB_ABORTED;
867
868 return error;
869 }
870
871
872 /*
873 * Extend the gl_pathv member of a glob_t structure to accommodate a new item,
874 * add the new item, and update gl_pathc.
875 *
876 * This assumes the BSD realloc, which only copies the block when its size
877 * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
878 * behavior.
879 *
880 * Return 0 if new item added, error code if memory couldn't be allocated.
881 *
882 * Invariant of the glob_t structure:
883 * Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
884 * gl_pathv points to (gl_offs + gl_pathc + 1) items.
885 */
886 static int
globextend(const Char * path,glob_t * pglob,struct glob_limit * limit)887 globextend(const Char *path, glob_t *pglob, struct glob_limit *limit)
888 {
889 char **pathv;
890 size_t i, newsize, len;
891 char *copy;
892 const Char *p;
893
894 _DIAGASSERT(path != NULL);
895 _DIAGASSERT(pglob != NULL);
896
897 newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs);
898 if ((pglob->gl_flags & GLOB_LIMIT) &&
899 newsize > GLOB_LIMIT_PATH * sizeof(*pathv))
900 goto nospace;
901 pathv = pglob->gl_pathv ? realloc(pglob->gl_pathv, newsize) :
902 malloc(newsize);
903 if (pathv == NULL)
904 return GLOB_NOSPACE;
905
906 if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
907 /* first time around -- clear initial gl_offs items */
908 pathv += pglob->gl_offs;
909 for (i = pglob->gl_offs + 1; --i > 0; )
910 *--pathv = NULL;
911 }
912 pglob->gl_pathv = pathv;
913
914 for (p = path; *p++;)
915 continue;
916 len = (size_t)(p - path);
917 limit->l_string += len;
918 if ((copy = malloc(len)) != NULL) {
919 if (g_Ctoc(path, copy, len)) {
920 free(copy);
921 return GLOB_ABORTED;
922 }
923 pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
924 }
925 pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
926
927 if ((pglob->gl_flags & GLOB_LIMIT) &&
928 (newsize + limit->l_string) >= GLOB_LIMIT_STRING)
929 goto nospace;
930
931 return copy == NULL ? GLOB_NOSPACE : 0;
932 nospace:
933 errno = 0;
934 return GLOB_NOSPACE;
935 }
936
937
938 /*
939 * pattern matching function for filenames. Each occurrence of the *
940 * pattern causes a recursion level.
941 */
942 static int
match(const Char * name,const Char * pat,const Char * patend)943 match(const Char *name, const Char *pat, const Char *patend)
944 {
945 int ok, negate_range;
946 Char c, k;
947
948 _DIAGASSERT(name != NULL);
949 _DIAGASSERT(pat != NULL);
950 _DIAGASSERT(patend != NULL);
951
952 while (pat < patend) {
953 c = *pat++;
954 switch (c & M_MASK) {
955 case M_ALL:
956 while (pat < patend && (*pat & M_MASK) == M_ALL)
957 pat++; /* eat consecutive '*' */
958 if (pat == patend)
959 return 1;
960 for (; !match(name, pat, patend); name++)
961 if (*name == EOS)
962 return 0;
963 return 1;
964 case M_ONE:
965 if (*name++ == EOS)
966 return 0;
967 break;
968 case M_SET:
969 ok = 0;
970 if ((k = *name++) == EOS)
971 return 0;
972 if ((negate_range = ((*pat & M_MASK) == M_NOT)) != EOS)
973 ++pat;
974 while (((c = *pat++) & M_MASK) != M_END)
975 if ((*pat & M_MASK) == M_RNG) {
976 if (c <= k && k <= pat[1])
977 ok = 1;
978 pat += 2;
979 } else if (c == k)
980 ok = 1;
981 if (ok == negate_range)
982 return 0;
983 break;
984 default:
985 if (*name++ != c)
986 return 0;
987 break;
988 }
989 }
990 return *name == EOS;
991 }
992
993 /* Free allocated data belonging to a glob_t structure. */
994 void
globfree(glob_t * pglob)995 globfree(glob_t *pglob)
996 {
997 size_t i;
998 char **pp;
999
1000 _DIAGASSERT(pglob != NULL);
1001
1002 if (pglob->gl_pathv != NULL) {
1003 pp = pglob->gl_pathv + pglob->gl_offs;
1004 for (i = pglob->gl_pathc; i--; ++pp)
1005 if (*pp)
1006 free(*pp);
1007 free(pglob->gl_pathv);
1008 pglob->gl_pathv = NULL;
1009 pglob->gl_pathc = 0;
1010 }
1011 }
1012
1013 #ifndef __LIBC12_SOURCE__
1014 int
glob_pattern_p(const char * pattern,int quote)1015 glob_pattern_p(const char *pattern, int quote)
1016 {
1017 int range = 0;
1018
1019 for (; *pattern; pattern++)
1020 switch (*pattern) {
1021 case QUESTION:
1022 case STAR:
1023 return 1;
1024
1025 case QUOTE:
1026 if (quote && pattern[1] != EOS)
1027 ++pattern;
1028 break;
1029
1030 case LBRACKET:
1031 range = 1;
1032 break;
1033
1034 case RBRACKET:
1035 if (range)
1036 return 1;
1037 break;
1038 default:
1039 break;
1040 }
1041
1042 return 0;
1043 }
1044 #endif
1045
1046 static DIR *
g_opendir(Char * str,glob_t * pglob)1047 g_opendir(Char *str, glob_t *pglob)
1048 {
1049 char buf[MAXPATHLEN];
1050
1051 _DIAGASSERT(str != NULL);
1052 _DIAGASSERT(pglob != NULL);
1053
1054 if (!*str)
1055 (void)strlcpy(buf, ".", sizeof(buf));
1056 else {
1057 if (g_Ctoc(str, buf, sizeof(buf)))
1058 return NULL;
1059 }
1060
1061 if (pglob->gl_flags & GLOB_ALTDIRFUNC)
1062 return (*pglob->gl_opendir)(buf);
1063
1064 return opendir(buf);
1065 }
1066
1067 static int
g_lstat(Char * fn,__gl_stat_t * sb,glob_t * pglob)1068 g_lstat(Char *fn, __gl_stat_t *sb, glob_t *pglob)
1069 {
1070 char buf[MAXPATHLEN];
1071
1072 _DIAGASSERT(fn != NULL);
1073 _DIAGASSERT(sb != NULL);
1074 _DIAGASSERT(pglob != NULL);
1075
1076 if (g_Ctoc(fn, buf, sizeof(buf)))
1077 return -1;
1078 if (pglob->gl_flags & GLOB_ALTDIRFUNC)
1079 return (*pglob->gl_lstat)(buf, sb);
1080 return lstat(buf, sb);
1081 }
1082
1083 static int
g_stat(Char * fn,__gl_stat_t * sb,glob_t * pglob)1084 g_stat(Char *fn, __gl_stat_t *sb, glob_t *pglob)
1085 {
1086 char buf[MAXPATHLEN];
1087
1088 _DIAGASSERT(fn != NULL);
1089 _DIAGASSERT(sb != NULL);
1090 _DIAGASSERT(pglob != NULL);
1091
1092 if (g_Ctoc(fn, buf, sizeof(buf)))
1093 return -1;
1094 if (pglob->gl_flags & GLOB_ALTDIRFUNC)
1095 return (*pglob->gl_stat)(buf, sb);
1096 return stat(buf, sb);
1097 }
1098
1099 static Char *
g_strchr(const Char * str,int ch)1100 g_strchr(const Char *str, int ch)
1101 {
1102
1103 _DIAGASSERT(str != NULL);
1104
1105 do {
1106 if (*str == ch)
1107 return __UNCONST(str);
1108 } while (*str++);
1109 return NULL;
1110 }
1111
1112 static int
g_Ctoc(const Char * str,char * buf,size_t len)1113 g_Ctoc(const Char *str, char *buf, size_t len)
1114 {
1115 char *dc;
1116
1117 _DIAGASSERT(str != NULL);
1118 _DIAGASSERT(buf != NULL);
1119
1120 if (len == 0)
1121 return 1;
1122
1123 for (dc = buf; len && (*dc++ = *str++) != EOS; len--)
1124 continue;
1125
1126 return len == 0;
1127 }
1128
1129 #ifdef DEBUG
1130 static void
qprintf(const char * str,Char * s)1131 qprintf(const char *str, Char *s)
1132 {
1133 Char *p;
1134
1135 _DIAGASSERT(str != NULL);
1136 _DIAGASSERT(s != NULL);
1137
1138 (void)printf("%s:\n", str);
1139 for (p = s; *p; p++)
1140 (void)printf("%c", CHAR(*p));
1141 (void)printf("\n");
1142 for (p = s; *p; p++)
1143 (void)printf("%c", *p & M_PROTECT ? '"' : ' ');
1144 (void)printf("\n");
1145 for (p = s; *p; p++)
1146 (void)printf("%c", ismeta(*p) ? '_' : ' ');
1147 (void)printf("\n");
1148 }
1149 #endif
1150