1 /* $NetBSD: glob.c,v 1.39 2019/05/29 01:21:33 christos 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 1.39 2019/05/29 01:21:33 christos Exp $");
41 #endif
42 #endif /* LIBC_SCCS and not lint */
43
44 /*
45 * glob(3) -- a superset of the one defined in POSIX 1003.2.
46 *
47 * The [!...] convention to negate a range is supported (SysV, Posix, ksh).
48 *
49 * Optional extra services, controlled by flags not defined by POSIX:
50 *
51 * GLOB_MAGCHAR:
52 * Set in gl_flags if pattern contained a globbing character.
53 * GLOB_NOMAGIC:
54 * Same as GLOB_NOCHECK, but it will only append pattern if it did
55 * not contain any magic characters. [Used in csh style globbing]
56 * GLOB_ALTDIRFUNC:
57 * Use alternately specified directory access functions.
58 * GLOB_TILDE:
59 * expand ~user/foo to the /home/dir/of/user/foo
60 * GLOB_BRACE:
61 * expand {1,2}{a,b} to 1a 1b 2a 2b
62 * GLOB_PERIOD:
63 * allow metacharacters to match leading dots in filenames.
64 * GLOB_NO_DOTDIRS:
65 * . and .. are hidden from wildcards, even if GLOB_PERIOD is set.
66 * gl_matchc:
67 * Number of matches in the current invocation of glob.
68 */
69
70 #include "namespace.h"
71 #include <sys/param.h>
72 #include <sys/stat.h>
73
74 #include <assert.h>
75 #include <ctype.h>
76 #include <dirent.h>
77 #include <errno.h>
78 #include <glob.h>
79 #include <pwd.h>
80 #include <stdio.h>
81 #include <stddef.h>
82 #include <stdlib.h>
83 #include <string.h>
84 #include <unistd.h>
85
86 #ifdef HAVE_NBTOOL_CONFIG_H
87 #define NO_GETPW_R
88 #endif
89
90 #define GLOB_LIMIT_STRING 524288 /* number of readdirs */
91 #define GLOB_LIMIT_STAT 128 /* number of stat system calls */
92 #define GLOB_LIMIT_READDIR 65536 /* total buffer size of path strings */
93 #define GLOB_LIMIT_PATH 1024 /* number of path elements */
94 #define GLOB_LIMIT_BRACE 128 /* Number of brace calls */
95
96 struct glob_limit {
97 size_t l_string;
98 size_t l_stat;
99 size_t l_readdir;
100 size_t l_brace;
101 };
102
103 /*
104 * XXX: For NetBSD 1.4.x compatibility. (kill me l8r)
105 */
106 #ifndef _DIAGASSERT
107 #define _DIAGASSERT(a)
108 #endif
109
110 #define DOLLAR '$'
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 int globtilde(const Char **, const Char *, Char *, size_t,
174 glob_t *);
175 static int globexp1(const Char *, glob_t *, struct glob_limit *);
176 static int globexp2(const Char *, const Char *, glob_t *, int *,
177 struct glob_limit *);
178 static int match(const Char *, const Char *, const Char *);
179 #ifdef DEBUG
180 static void qprintf(const char *, Char *);
181 #endif
182
183 int
glob(const char * __restrict pattern,int flags,int (* errfunc)(const char *,int),glob_t * __restrict pglob)184 glob(const char * __restrict pattern, int flags, int (*errfunc)(const char *,
185 int), glob_t * __restrict pglob)
186 {
187 const unsigned char *patnext;
188 int c;
189 Char *bufnext, *bufend, patbuf[MAXPATHLEN+1];
190 struct glob_limit limit = { 0, 0, 0, 0 };
191
192 _DIAGASSERT(pattern != NULL);
193
194 patnext = (const unsigned char *) pattern;
195 if (!(flags & GLOB_APPEND)) {
196 pglob->gl_pathc = 0;
197 pglob->gl_pathv = NULL;
198 if (!(flags & GLOB_DOOFFS))
199 pglob->gl_offs = 0;
200 }
201 pglob->gl_flags = flags & ~GLOB_MAGCHAR;
202 pglob->gl_errfunc = errfunc;
203 pglob->gl_matchc = 0;
204
205 bufnext = patbuf;
206 bufend = bufnext + MAXPATHLEN;
207 if (flags & GLOB_NOESCAPE) {
208 while (bufnext < bufend && (c = *patnext++) != EOS)
209 *bufnext++ = c;
210 } else {
211 /* Protect the quoted characters. */
212 while (bufnext < bufend && (c = *patnext++) != EOS)
213 if (c == QUOTE) {
214 if ((c = *patnext++) == EOS) {
215 c = QUOTE;
216 --patnext;
217 }
218 *bufnext++ = c | M_PROTECT;
219 }
220 else
221 *bufnext++ = c;
222 }
223 *bufnext = EOS;
224
225 if (flags & GLOB_BRACE)
226 return globexp1(patbuf, pglob, &limit);
227 else
228 return glob0(patbuf, pglob, &limit);
229 }
230
231 /*
232 * Expand recursively a glob {} pattern. When there is no more expansion
233 * invoke the standard globbing routine to glob the rest of the magic
234 * characters
235 */
236 static int
globexp1(const Char * pattern,glob_t * pglob,struct glob_limit * limit)237 globexp1(const Char *pattern, glob_t *pglob, struct glob_limit *limit)
238 {
239 const Char* ptr = pattern;
240 int rv;
241
242 _DIAGASSERT(pattern != NULL);
243 _DIAGASSERT(pglob != NULL);
244
245 if ((pglob->gl_flags & GLOB_LIMIT) &&
246 limit->l_brace++ >= GLOB_LIMIT_BRACE) {
247 errno = 0;
248 return GLOB_NOSPACE;
249 }
250
251 /* Protect a single {}, for find(1), like csh */
252 if (pattern[0] == LBRACE && pattern[1] == RBRACE && pattern[2] == EOS)
253 return glob0(pattern, pglob, limit);
254
255 while ((ptr = (const Char *) g_strchr(ptr, LBRACE)) != NULL)
256 if (!globexp2(ptr, pattern, pglob, &rv, limit))
257 return rv;
258
259 return glob0(pattern, pglob, limit);
260 }
261
262
263 /*
264 * Recursive brace globbing helper. Tries to expand a single brace.
265 * If it succeeds then it invokes globexp1 with the new pattern.
266 * If it fails then it tries to glob the rest of the pattern and returns.
267 */
268 static int
globexp2(const Char * ptr,const Char * pattern,glob_t * pglob,int * rv,struct glob_limit * limit)269 globexp2(const Char *ptr, const Char *pattern, glob_t *pglob, int *rv,
270 struct glob_limit *limit)
271 {
272 int i;
273 Char *lm, *ls;
274 const Char *pe, *pm, *pl;
275 Char patbuf[MAXPATHLEN + 1];
276
277 _DIAGASSERT(ptr != NULL);
278 _DIAGASSERT(pattern != NULL);
279 _DIAGASSERT(pglob != NULL);
280 _DIAGASSERT(rv != NULL);
281
282 /* copy part up to the brace */
283 for (lm = patbuf, pm = pattern; pm != ptr; *lm++ = *pm++)
284 continue;
285 ls = lm;
286
287 /* Find the balanced brace */
288 for (i = 0, pe = ++ptr; *pe; pe++)
289 if (*pe == LBRACKET) {
290 /* Ignore everything between [] */
291 for (pm = pe++; *pe != RBRACKET && *pe != EOS; pe++)
292 continue;
293 if (*pe == EOS) {
294 /*
295 * We could not find a matching RBRACKET.
296 * Ignore and just look for RBRACE
297 */
298 pe = pm;
299 }
300 }
301 else if (*pe == LBRACE)
302 i++;
303 else if (*pe == RBRACE) {
304 if (i == 0)
305 break;
306 i--;
307 }
308
309 /* Non matching braces; just glob the pattern */
310 if (i != 0 || *pe == EOS) {
311 /*
312 * we use `pattern', not `patbuf' here so that that
313 * unbalanced braces are passed to the match
314 */
315 *rv = glob0(pattern, pglob, limit);
316 return 0;
317 }
318
319 for (i = 0, pl = pm = ptr; pm <= pe; pm++) {
320 switch (*pm) {
321 case LBRACKET:
322 /* Ignore everything between [] */
323 for (pl = pm++; *pm != RBRACKET && *pm != EOS; pm++)
324 continue;
325 if (*pm == EOS) {
326 /*
327 * We could not find a matching RBRACKET.
328 * Ignore and just look for RBRACE
329 */
330 pm = pl;
331 }
332 break;
333
334 case LBRACE:
335 i++;
336 break;
337
338 case RBRACE:
339 if (i) {
340 i--;
341 break;
342 }
343 /* FALLTHROUGH */
344 case COMMA:
345 if (i && *pm == COMMA)
346 break;
347 else {
348 /* Append the current string */
349 for (lm = ls; (pl < pm); *lm++ = *pl++)
350 continue;
351 /*
352 * Append the rest of the pattern after the
353 * closing brace
354 */
355 for (pl = pe + 1; (*lm++ = *pl++) != EOS;)
356 continue;
357
358 /* Expand the current pattern */
359 #ifdef DEBUG
360 qprintf("globexp2", patbuf);
361 #endif
362 *rv = globexp1(patbuf, pglob, limit);
363
364 /* move after the comma, to the next string */
365 pl = pm + 1;
366 }
367 break;
368
369 default:
370 break;
371 }
372 }
373 *rv = 0;
374 return 0;
375 }
376
377
378
379 /*
380 * expand tilde from the passwd file.
381 */
382 static int
globtilde(const Char ** qpatnext,const Char * pattern,Char * patbuf,size_t patsize,glob_t * pglob)383 globtilde(const Char **qpatnext, const Char *pattern, Char *patbuf,
384 size_t patsize, glob_t *pglob)
385 {
386 struct passwd *pwd;
387 const char *h;
388 const Char *p;
389 Char *b;
390 char *d;
391 Char *pend = &patbuf[patsize / sizeof(Char)];
392 #ifndef NO_GETPW_R
393 struct passwd pwres;
394 char pwbuf[1024];
395 #endif
396
397 pend--;
398
399 _DIAGASSERT(pattern != NULL);
400 _DIAGASSERT(patbuf != NULL);
401 _DIAGASSERT(pglob != NULL);
402 *qpatnext = pattern;
403
404 if (*pattern != TILDE || !(pglob->gl_flags & GLOB_TILDE))
405 return 0;
406
407 /* Copy up to the end of the string or / */
408 for (p = pattern + 1, d = (char *)(void *)patbuf;
409 d < (char *)(void *)pend && *p && *p != SLASH;
410 *d++ = *p++)
411 continue;
412
413 if (d == (char *)(void *)pend)
414 return GLOB_ABEND;
415
416 *d = EOS;
417 d = (char *)(void *)patbuf;
418
419 if (*d == EOS) {
420 /*
421 * handle a plain ~ or ~/ by expanding $HOME
422 * first and then trying the password file
423 */
424 if ((h = getenv("HOME")) == NULL) {
425 #ifdef NO_GETPW_R
426 if ((pwd = getpwuid(getuid())) == NULL)
427 #else
428 if (getpwuid_r(getuid(), &pwres, pwbuf, sizeof(pwbuf),
429 &pwd) != 0 || pwd == NULL)
430 #endif
431 goto nouser;
432 h = pwd->pw_dir;
433 }
434 }
435 else {
436 /*
437 * Expand a ~user
438 */
439 #ifdef NO_GETPW_R
440 if ((pwd = getpwnam(d)) == NULL)
441 #else
442 if (getpwnam_r(d, &pwres, pwbuf, sizeof(pwbuf), &pwd) != 0 ||
443 pwd == NULL)
444 #endif
445 goto nouser;
446 h = pwd->pw_dir;
447 }
448
449 /* Copy the home directory */
450 for (b = patbuf; b < pend && *h; *b++ = *h++)
451 continue;
452
453 if (b == pend)
454 return GLOB_ABEND;
455
456 /* Append the rest of the pattern */
457 while (b < pend && (*b++ = *p++) != EOS)
458 continue;
459
460 if (b == pend)
461 return GLOB_ABEND;
462
463 *qpatnext = patbuf;
464 return 0;
465 nouser:
466 return (pglob->gl_flags & GLOB_TILDE_CHECK) ? GLOB_NOMATCH : 0;
467 }
468
469
470 /*
471 * The main glob() routine: compiles the pattern (optionally processing
472 * quotes), calls glob1() to do the real pattern matching, and finally
473 * sorts the list (unless unsorted operation is requested). Returns 0
474 * if things went well, nonzero if errors occurred. It is not an error
475 * to find no matches.
476 */
477 static int
glob0(const Char * pattern,glob_t * pglob,struct glob_limit * limit)478 glob0(const Char *pattern, glob_t *pglob, struct glob_limit *limit)
479 {
480 const Char *qpatnext;
481 int c, error;
482 __gl_size_t oldpathc;
483 Char *bufnext, patbuf[MAXPATHLEN+1];
484
485 _DIAGASSERT(pattern != NULL);
486 _DIAGASSERT(pglob != NULL);
487
488 if ((error = globtilde(&qpatnext, pattern, patbuf, sizeof(patbuf),
489 pglob)) != 0)
490 return error;
491 oldpathc = pglob->gl_pathc;
492 bufnext = patbuf;
493
494 /* We don't need to check for buffer overflow any more. */
495 while ((c = *qpatnext++) != EOS) {
496 switch (c) {
497 case LBRACKET:
498 c = *qpatnext;
499 if (c == NOT)
500 ++qpatnext;
501 if (*qpatnext == EOS ||
502 g_strchr(qpatnext+1, RBRACKET) == NULL) {
503 *bufnext++ = LBRACKET;
504 if (c == NOT)
505 --qpatnext;
506 break;
507 }
508 *bufnext++ = M_SET;
509 if (c == NOT)
510 *bufnext++ = M_NOT;
511 c = *qpatnext++;
512 do {
513 *bufnext++ = CHAR(c);
514 if (*qpatnext == RANGE &&
515 (c = qpatnext[1]) != RBRACKET) {
516 *bufnext++ = M_RNG;
517 *bufnext++ = CHAR(c);
518 qpatnext += 2;
519 }
520 } while ((c = *qpatnext++) != RBRACKET);
521 pglob->gl_flags |= GLOB_MAGCHAR;
522 *bufnext++ = M_END;
523 break;
524 case QUESTION:
525 pglob->gl_flags |= GLOB_MAGCHAR;
526 *bufnext++ = M_ONE;
527 break;
528 case STAR:
529 pglob->gl_flags |= GLOB_MAGCHAR;
530 /* collapse adjacent stars to one [or three if globstar]
531 * to avoid exponential behavior
532 */
533 if (bufnext == patbuf || bufnext[-1] != M_ALL ||
534 ((pglob->gl_flags & GLOB_STAR) != 0 &&
535 (bufnext - 1 == patbuf || bufnext[-2] != M_ALL ||
536 bufnext - 2 == patbuf || bufnext[-3] != M_ALL)))
537 *bufnext++ = M_ALL;
538 break;
539 default:
540 *bufnext++ = CHAR(c);
541 break;
542 }
543 }
544 *bufnext = EOS;
545 #ifdef DEBUG
546 qprintf("glob0", patbuf);
547 #endif
548
549 if ((error = glob1(patbuf, pglob, limit)) != 0)
550 return error;
551
552 if (pglob->gl_pathc == oldpathc) {
553 /*
554 * If there was no match we are going to append the pattern
555 * if GLOB_NOCHECK was specified or if GLOB_NOMAGIC was
556 * specified and the pattern did not contain any magic
557 * characters GLOB_NOMAGIC is there just for compatibility
558 * with csh.
559 */
560 if ((pglob->gl_flags & GLOB_NOCHECK) ||
561 ((pglob->gl_flags & (GLOB_NOMAGIC|GLOB_MAGCHAR))
562 == GLOB_NOMAGIC)) {
563 return globextend(pattern, pglob, limit);
564 } else {
565 return GLOB_NOMATCH;
566 }
567 } else if (!(pglob->gl_flags & GLOB_NOSORT)) {
568 qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc,
569 (size_t)pglob->gl_pathc - oldpathc, sizeof(char *),
570 compare);
571 }
572
573 return 0;
574 }
575
576 static int
compare(const void * p,const void * q)577 compare(const void *p, const void *q)
578 {
579
580 _DIAGASSERT(p != NULL);
581 _DIAGASSERT(q != NULL);
582
583 return strcoll(*(const char * const *)p, *(const char * const *)q);
584 }
585
586 static int
glob1(Char * pattern,glob_t * pglob,struct glob_limit * limit)587 glob1(Char *pattern, glob_t *pglob, struct glob_limit *limit)
588 {
589 Char pathbuf[MAXPATHLEN+1];
590
591 _DIAGASSERT(pattern != NULL);
592 _DIAGASSERT(pglob != NULL);
593
594 /* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */
595 if (*pattern == EOS)
596 return 0;
597 /*
598 * we save one character so that we can use ptr >= limit,
599 * in the general case when we are appending non nul chars only.
600 */
601 return glob2(pathbuf, pathbuf,
602 pathbuf + (sizeof(pathbuf) / sizeof(*pathbuf)) - 1, pattern,
603 pglob, limit);
604 }
605
606 /*
607 * The functions glob2 and glob3 are mutually recursive; there is one level
608 * of recursion for each segment in the pattern that contains one or more
609 * meta characters.
610 */
611 static int
glob2(Char * pathbuf,Char * pathend,Char * pathlim,const Char * pattern,glob_t * pglob,struct glob_limit * limit)612 glob2(Char *pathbuf, Char *pathend, Char *pathlim, const Char *pattern,
613 glob_t *pglob, struct glob_limit *limit)
614 {
615 __gl_stat_t sb;
616 const Char *p;
617 Char *q;
618 int anymeta;
619
620 _DIAGASSERT(pathbuf != NULL);
621 _DIAGASSERT(pathend != NULL);
622 _DIAGASSERT(pattern != NULL);
623 _DIAGASSERT(pglob != NULL);
624
625 #ifdef DEBUG
626 qprintf("glob2", pathbuf);
627 #endif
628 /*
629 * Loop over pattern segments until end of pattern or until
630 * segment with meta character found.
631 */
632 for (anymeta = 0;;) {
633 if (*pattern == EOS) { /* End of pattern? */
634 *pathend = EOS;
635 if (g_lstat(pathbuf, &sb, pglob))
636 return 0;
637
638 if ((pglob->gl_flags & GLOB_LIMIT) &&
639 limit->l_stat++ >= GLOB_LIMIT_STAT) {
640 errno = 0;
641 *pathend++ = SEP;
642 *pathend = EOS;
643 return GLOB_NOSPACE;
644 }
645 if (((pglob->gl_flags & GLOB_MARK) &&
646 pathend[-1] != SEP) && (S_ISDIR(sb.st_mode) ||
647 (S_ISLNK(sb.st_mode) &&
648 (g_stat(pathbuf, &sb, pglob) == 0) &&
649 S_ISDIR(sb.st_mode)))) {
650 if (pathend >= pathlim)
651 return GLOB_ABORTED;
652 *pathend++ = SEP;
653 *pathend = EOS;
654 }
655 ++pglob->gl_matchc;
656 return globextend(pathbuf, pglob, limit);
657 }
658
659 /* Find end of next segment, copy tentatively to pathend. */
660 q = pathend;
661 p = pattern;
662 while (*p != EOS && *p != SEP) {
663 if (ismeta(*p))
664 anymeta = 1;
665 if (q >= pathlim)
666 return GLOB_ABORTED;
667 *q++ = *p++;
668 }
669
670 if (!anymeta) {
671 pathend = q;
672 pattern = p;
673 while (*pattern == SEP) {
674 if (pathend >= pathlim)
675 return GLOB_ABORTED;
676 *pathend++ = *pattern++;
677 }
678 } else /* Need expansion, recurse. */
679 return glob3(pathbuf, pathend, pathlim, pattern, p,
680 pattern, pglob, limit);
681 }
682 /* NOTREACHED */
683 }
684
685 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)686 glob3(Char *pathbuf, Char *pathend, Char *pathlim, const Char *pattern,
687 const Char *restpattern, const Char *pglobstar, glob_t *pglob,
688 struct glob_limit *limit)
689 {
690 struct dirent *dp;
691 DIR *dirp;
692 __gl_stat_t sbuf;
693 int error;
694 char buf[MAXPATHLEN];
695 int globstar = 0;
696 int chase_symlinks = 0;
697 const Char *termstar = NULL;
698
699 /*
700 * The readdirfunc declaration can't be prototyped, because it is
701 * assigned, below, to two functions which are prototyped in glob.h
702 * and dirent.h as taking pointers to differently typed opaque
703 * structures.
704 */
705 struct dirent *(*readdirfunc)(void *);
706
707 _DIAGASSERT(pathbuf != NULL);
708 _DIAGASSERT(pathend != NULL);
709 _DIAGASSERT(pattern != NULL);
710 _DIAGASSERT(restpattern != NULL);
711 _DIAGASSERT(pglob != NULL);
712
713 *pathend = EOS;
714 errno = 0;
715
716 while (pglobstar < restpattern) {
717 if ((pglobstar[0] & M_MASK) == M_ALL &&
718 (pglobstar[1] & M_MASK) == M_ALL) {
719 globstar = 1;
720 chase_symlinks = (pglobstar[2] & M_MASK) == M_ALL;
721 termstar = pglobstar + (2 + chase_symlinks);
722 break;
723 }
724 pglobstar++;
725 }
726
727 if (globstar) {
728 error = pglobstar == pattern && termstar == restpattern ?
729 *restpattern == EOS ?
730 glob2(pathbuf, pathend, pathlim, restpattern - 1, pglob,
731 limit) :
732 glob2(pathbuf, pathend, pathlim, restpattern + 1, pglob,
733 limit) :
734 glob3(pathbuf, pathend, pathlim, pattern, restpattern,
735 termstar, pglob, limit);
736 if (error)
737 return error;
738 *pathend = EOS;
739 }
740
741 if (*pathbuf && (g_lstat(pathbuf, &sbuf, pglob) ||
742 !S_ISDIR(sbuf.st_mode)
743 #ifdef S_IFLINK
744 && ((globstar && !chase_symlinks) || !S_ISLNK(sbuf.st_mode))
745 #endif
746 ))
747 return 0;
748
749 if ((dirp = g_opendir(pathbuf, pglob)) == NULL) {
750 if (pglob->gl_errfunc) {
751 if (g_Ctoc(pathbuf, buf, sizeof(buf)))
752 return GLOB_ABORTED;
753 if (pglob->gl_errfunc(buf, errno) ||
754 pglob->gl_flags & GLOB_ERR)
755 return GLOB_ABORTED;
756 }
757 /*
758 * Posix/XOpen: glob should return when it encounters a
759 * directory that it cannot open or read
760 * XXX: Should we ignore ENOTDIR and ENOENT though?
761 * I think that Posix had in mind EPERM...
762 */
763 if (pglob->gl_flags & GLOB_ERR)
764 return GLOB_ABORTED;
765
766 return 0;
767 }
768
769 error = 0;
770
771 /* Search directory for matching names. */
772 if (pglob->gl_flags & GLOB_ALTDIRFUNC)
773 readdirfunc = pglob->gl_readdir;
774 else
775 readdirfunc = (struct dirent *(*)(void *)) readdir;
776 while ((dp = (*readdirfunc)(dirp)) != NULL) {
777 unsigned char *sc;
778 Char *dc;
779
780 if ((pglob->gl_flags & GLOB_LIMIT) &&
781 limit->l_readdir++ >= GLOB_LIMIT_READDIR) {
782 errno = 0;
783 *pathend++ = SEP;
784 *pathend = EOS;
785 error = GLOB_NOSPACE;
786 break;
787 }
788
789 /*
790 * Initial DOT must be matched literally, unless we have
791 * GLOB_PERIOD set.
792 */
793 if ((pglob->gl_flags & GLOB_PERIOD) == 0)
794 if (dp->d_name[0] == DOT && *pattern != DOT)
795 continue;
796 /*
797 * If GLOB_NO_DOTDIRS is set, . and .. vanish.
798 */
799 if ((pglob->gl_flags & GLOB_NO_DOTDIRS) &&
800 (dp->d_name[0] == DOT) &&
801 ((dp->d_name[1] == EOS) ||
802 ((dp->d_name[1] == DOT) && (dp->d_name[2] == EOS))))
803 continue;
804 /*
805 * The resulting string contains EOS, so we can
806 * use the pathlim character, if it is the nul
807 */
808 for (sc = (unsigned char *) dp->d_name, dc = pathend;
809 dc <= pathlim && (*dc++ = *sc++) != EOS;)
810 continue;
811
812 /*
813 * Have we filled the buffer without seeing EOS?
814 */
815 if (dc > pathlim && *pathlim != EOS) {
816 /*
817 * Abort when requested by caller, otherwise
818 * reset pathend back to last SEP and continue
819 * with next dir entry.
820 */
821 if (pglob->gl_flags & GLOB_ERR) {
822 error = GLOB_ABORTED;
823 break;
824 }
825 else {
826 *pathend = EOS;
827 continue;
828 }
829 }
830
831 if (globstar) {
832 #ifdef S_IFLNK
833 if (!chase_symlinks &&
834 (g_lstat(pathbuf, &sbuf, pglob) ||
835 S_ISLNK(sbuf.st_mode)))
836 continue;
837 #endif
838
839 if (!match(pathend, pattern, termstar))
840 continue;
841
842 if (--dc < pathlim - 2)
843 *dc++ = SEP;
844 *dc = EOS;
845 error = glob2(pathbuf, dc, pathlim, pglobstar,
846 pglob, limit);
847 if (error)
848 break;
849 *pathend = EOS;
850 } else {
851 if (!match(pathend, pattern, restpattern)) {
852 *pathend = EOS;
853 continue;
854 }
855 error = glob2(pathbuf, --dc, pathlim, restpattern,
856 pglob, limit);
857 if (error)
858 break;
859 }
860 }
861 if (pglob->gl_flags & GLOB_ALTDIRFUNC)
862 (*pglob->gl_closedir)(dirp);
863 else
864 closedir(dirp);
865
866 /*
867 * Again Posix X/Open issue with regards to error handling.
868 */
869 if ((error || errno) && (pglob->gl_flags & GLOB_ERR))
870 return GLOB_ABORTED;
871
872 return error;
873 }
874
875
876 /*
877 * Extend the gl_pathv member of a glob_t structure to accommodate a new item,
878 * add the new item, and update gl_pathc.
879 *
880 * This assumes the BSD realloc, which only copies the block when its size
881 * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
882 * behavior.
883 *
884 * Return 0 if new item added, error code if memory couldn't be allocated.
885 *
886 * Invariant of the glob_t structure:
887 * Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
888 * gl_pathv points to (gl_offs + gl_pathc + 1) items.
889 */
890 static int
globextend(const Char * path,glob_t * pglob,struct glob_limit * limit)891 globextend(const Char *path, glob_t *pglob, struct glob_limit *limit)
892 {
893 char **pathv;
894 size_t i, newsize, len;
895 char *copy;
896 const Char *p;
897
898 _DIAGASSERT(path != NULL);
899 _DIAGASSERT(pglob != NULL);
900
901 newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs);
902 if ((pglob->gl_flags & GLOB_LIMIT) &&
903 newsize > GLOB_LIMIT_PATH * sizeof(*pathv))
904 goto nospace;
905 pathv = pglob->gl_pathv ? realloc(pglob->gl_pathv, newsize) :
906 malloc(newsize);
907 if (pathv == NULL)
908 return GLOB_NOSPACE;
909
910 if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
911 /* first time around -- clear initial gl_offs items */
912 pathv += pglob->gl_offs;
913 for (i = pglob->gl_offs + 1; --i > 0; )
914 *--pathv = NULL;
915 }
916 pglob->gl_pathv = pathv;
917
918 for (p = path; *p++;)
919 continue;
920 len = (size_t)(p - path);
921 limit->l_string += len;
922 if ((copy = malloc(len)) != NULL) {
923 if (g_Ctoc(path, copy, len)) {
924 free(copy);
925 return GLOB_ABORTED;
926 }
927 pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
928 }
929 pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
930
931 if ((pglob->gl_flags & GLOB_LIMIT) &&
932 (newsize + limit->l_string) >= GLOB_LIMIT_STRING)
933 goto nospace;
934
935 return copy == NULL ? GLOB_NOSPACE : 0;
936 nospace:
937 errno = 0;
938 return GLOB_NOSPACE;
939 }
940
941
942 /*
943 * pattern matching function for filenames.
944 */
945 static int
match(const Char * name,const Char * pat,const Char * patend)946 match(const Char *name, const Char *pat, const Char *patend)
947 {
948 int ok, negate_range;
949 Char c, k;
950 const Char *patNext, *nameNext, *nameStart, *nameEnd;
951
952 _DIAGASSERT(name != NULL);
953 _DIAGASSERT(pat != NULL);
954 _DIAGASSERT(patend != NULL);
955 patNext = pat;
956 nameStart = nameNext = name;
957 nameEnd = NULL;
958
959 while (pat < patend || *name) {
960 c = *pat;
961 if (*name == EOS)
962 nameEnd = name;
963 switch (c & M_MASK) {
964 case M_ALL:
965 while ((pat[1] & M_MASK) == M_ALL) pat++;
966 patNext = pat;
967 nameNext = name + 1;
968 pat++;
969 continue;
970 case M_ONE:
971 if (*name == EOS)
972 break;
973 pat++;
974 name++;
975 continue;
976 case M_SET:
977 ok = 0;
978 if ((k = *name) == EOS)
979 break;
980 pat++;
981 name++;
982 if ((negate_range = ((*pat & M_MASK) == M_NOT)) != EOS)
983 ++pat;
984 while (((c = *pat++) & M_MASK) != M_END)
985 if ((*pat & M_MASK) == M_RNG) {
986 if (c <= k && k <= pat[1])
987 ok = 1;
988 pat += 2;
989 } else if (c == k)
990 ok = 1;
991 if (ok == negate_range)
992 break;
993 continue;
994 default:
995 if (*name != c)
996 break;
997 pat++;
998 name++;
999 continue;
1000 }
1001 if (nameNext != nameStart
1002 && (nameEnd == NULL || nameNext <= nameEnd)) {
1003 pat = patNext;
1004 name = nameNext;
1005 continue;
1006 }
1007 return 0;
1008 }
1009 return 1;
1010 }
1011
1012 /* Free allocated data belonging to a glob_t structure. */
1013 void
globfree(glob_t * pglob)1014 globfree(glob_t *pglob)
1015 {
1016 size_t i;
1017 char **pp;
1018
1019 _DIAGASSERT(pglob != NULL);
1020
1021 if (pglob->gl_pathv != NULL) {
1022 pp = pglob->gl_pathv + pglob->gl_offs;
1023 for (i = pglob->gl_pathc; i--; ++pp)
1024 if (*pp)
1025 free(*pp);
1026 free(pglob->gl_pathv);
1027 pglob->gl_pathv = NULL;
1028 pglob->gl_pathc = 0;
1029 }
1030 }
1031
1032 #ifndef __LIBC12_SOURCE__
1033 int
glob_pattern_p(const char * pattern,int quote)1034 glob_pattern_p(const char *pattern, int quote)
1035 {
1036 int range = 0;
1037
1038 for (; *pattern; pattern++)
1039 switch (*pattern) {
1040 case QUESTION:
1041 case STAR:
1042 return 1;
1043
1044 case QUOTE:
1045 if (quote && pattern[1] != EOS)
1046 ++pattern;
1047 break;
1048
1049 case LBRACKET:
1050 range = 1;
1051 break;
1052
1053 case RBRACKET:
1054 if (range)
1055 return 1;
1056 break;
1057 default:
1058 break;
1059 }
1060
1061 return 0;
1062 }
1063 #endif
1064
1065 static DIR *
g_opendir(Char * str,glob_t * pglob)1066 g_opendir(Char *str, glob_t *pglob)
1067 {
1068 char buf[MAXPATHLEN];
1069
1070 _DIAGASSERT(str != NULL);
1071 _DIAGASSERT(pglob != NULL);
1072
1073 if (!*str)
1074 (void)strlcpy(buf, ".", sizeof(buf));
1075 else {
1076 if (g_Ctoc(str, buf, sizeof(buf)))
1077 return NULL;
1078 }
1079
1080 if (pglob->gl_flags & GLOB_ALTDIRFUNC)
1081 return (*pglob->gl_opendir)(buf);
1082
1083 return opendir(buf);
1084 }
1085
1086 static int
g_lstat(Char * fn,__gl_stat_t * sb,glob_t * pglob)1087 g_lstat(Char *fn, __gl_stat_t *sb, glob_t *pglob)
1088 {
1089 char buf[MAXPATHLEN];
1090
1091 _DIAGASSERT(fn != NULL);
1092 _DIAGASSERT(sb != NULL);
1093 _DIAGASSERT(pglob != NULL);
1094
1095 if (g_Ctoc(fn, buf, sizeof(buf)))
1096 return -1;
1097 if (pglob->gl_flags & GLOB_ALTDIRFUNC)
1098 return (*pglob->gl_lstat)(buf, sb);
1099 return lstat(buf, sb);
1100 }
1101
1102 static int
g_stat(Char * fn,__gl_stat_t * sb,glob_t * pglob)1103 g_stat(Char *fn, __gl_stat_t *sb, glob_t *pglob)
1104 {
1105 char buf[MAXPATHLEN];
1106
1107 _DIAGASSERT(fn != NULL);
1108 _DIAGASSERT(sb != NULL);
1109 _DIAGASSERT(pglob != NULL);
1110
1111 if (g_Ctoc(fn, buf, sizeof(buf)))
1112 return -1;
1113 if (pglob->gl_flags & GLOB_ALTDIRFUNC)
1114 return (*pglob->gl_stat)(buf, sb);
1115 return stat(buf, sb);
1116 }
1117
1118 static Char *
g_strchr(const Char * str,int ch)1119 g_strchr(const Char *str, int ch)
1120 {
1121
1122 _DIAGASSERT(str != NULL);
1123
1124 do {
1125 if (*str == ch)
1126 return __UNCONST(str);
1127 } while (*str++);
1128 return NULL;
1129 }
1130
1131 static int
g_Ctoc(const Char * str,char * buf,size_t len)1132 g_Ctoc(const Char *str, char *buf, size_t len)
1133 {
1134 char *dc;
1135
1136 _DIAGASSERT(str != NULL);
1137 _DIAGASSERT(buf != NULL);
1138
1139 if (len == 0)
1140 return 1;
1141
1142 for (dc = buf; len && (*dc++ = *str++) != EOS; len--)
1143 continue;
1144
1145 return len == 0;
1146 }
1147
1148 #ifdef DEBUG
1149 static void
qprintf(const char * str,Char * s)1150 qprintf(const char *str, Char *s)
1151 {
1152 Char *p;
1153
1154 _DIAGASSERT(str != NULL);
1155 _DIAGASSERT(s != NULL);
1156
1157 (void)printf("%s:\n", str);
1158 for (p = s; *p; p++)
1159 (void)printf("%c", CHAR(*p));
1160 (void)printf("\n");
1161 for (p = s; *p; p++)
1162 (void)printf("%c", *p & M_PROTECT ? '"' : ' ');
1163 (void)printf("\n");
1164 for (p = s; *p; p++)
1165 (void)printf("%c", ismeta(*p) ? '_' : ' ');
1166 (void)printf("\n");
1167 }
1168 #endif
1169