summaryrefslogtreecommitdiff
path: root/lib/libc/gen/glob.c
blob: 397b60d290406e6d174c7fdd7915a0f6a2fc91cc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
/*	$OpenBSD: glob.c,v 1.39 2012/01/20 07:09:42 tedu Exp $ */
/*
 * Copyright (c) 1989, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Guido van Rossum.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * glob(3) -- a superset of the one defined in POSIX 1003.2.
 *
 * The [!...] convention to negate a range is supported (SysV, Posix, ksh).
 *
 * Optional extra services, controlled by flags not defined by POSIX:
 *
 * GLOB_QUOTE:
 *	Escaping convention: \ inhibits any special meaning the following
 *	character might have (except \ at end of string is retained).
 * GLOB_MAGCHAR:
 *	Set in gl_flags if pattern contained a globbing character.
 * GLOB_NOMAGIC:
 *	Same as GLOB_NOCHECK, but it will only append pattern if it did
 *	not contain any magic characters.  [Used in csh style globbing]
 * GLOB_ALTDIRFUNC:
 *	Use alternately specified directory access functions.
 * GLOB_TILDE:
 *	expand ~user/foo to the /home/dir/of/user/foo
 * GLOB_BRACE:
 *	expand {1,2}{a,b} to 1a 1b 2a 2b
 * gl_matchc:
 *	Number of matches in the current invocation of glob.
 */

#include <sys/param.h>
#include <sys/stat.h>

#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <glob.h>
#include <limits.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "charclass.h"

#define	DOLLAR		'$'
#define	DOT		'.'
#define	EOS		'\0'
#define	LBRACKET	'['
#define	NOT		'!'
#define	QUESTION	'?'
#define	QUOTE		'\\'
#define	RANGE		'-'
#define	RBRACKET	']'
#define	SEP		'/'
#define	STAR		'*'
#define	TILDE		'~'
#define	UNDERSCORE	'_'
#define	LBRACE		'{'
#define	RBRACE		'}'
#define	SLASH		'/'
#define	COMMA		','

#ifndef DEBUG

#define	M_QUOTE		0x8000
#define	M_PROTECT	0x4000
#define	M_MASK		0xffff
#define	M_ASCII		0x00ff

typedef u_short Char;

#else

#define	M_QUOTE		0x80
#define	M_PROTECT	0x40
#define	M_MASK		0xff
#define	M_ASCII		0x7f

typedef char Char;

#endif


#define	CHAR(c)		((Char)((c)&M_ASCII))
#define	META(c)		((Char)((c)|M_QUOTE))
#define	M_ALL		META('*')
#define	M_END		META(']')
#define	M_NOT		META('!')
#define	M_ONE		META('?')
#define	M_RNG		META('-')
#define	M_SET		META('[')
#define	M_CLASS		META(':')
#define	ismeta(c)	(((c)&M_QUOTE) != 0)

#define	GLOB_LIMIT_MALLOC	65536
#define	GLOB_LIMIT_STAT		2048
#define	GLOB_LIMIT_READDIR	16384

/* Limit of recursion during matching attempts. */
#define GLOB_LIMIT_RECUR	64

struct glob_lim {
	size_t	glim_malloc;
	size_t	glim_stat;
	size_t	glim_readdir;
};

struct glob_path_stat {
	char		*gps_path;
	struct stat	*gps_stat;
};

static int	 compare(const void *, const void *);
static int	 compare_gps(const void *, const void *);
static int	 g_Ctoc(const Char *, char *, u_int);
static int	 g_lstat(Char *, struct stat *, glob_t *);
static DIR	*g_opendir(Char *, glob_t *);
static Char	*g_strchr(const Char *, int);
static int	 g_strncmp(const Char *, const char *, size_t);
static int	 g_stat(Char *, struct stat *, glob_t *);
static int	 glob0(const Char *, glob_t *, struct glob_lim *);
static int	 glob1(Char *, Char *, glob_t *, struct glob_lim *);
static int	 glob2(Char *, Char *, Char *, Char *, Char *, Char *,
		    glob_t *, struct glob_lim *);
static int	 glob3(Char *, Char *, Char *, Char *, Char *,
		    Char *, Char *, glob_t *, struct glob_lim *);
static int	 globextend(const Char *, glob_t *, struct glob_lim *,
		    struct stat *);
static const Char *
		 globtilde(const Char *, Char *, size_t, glob_t *);
static int	 globexp1(const Char *, glob_t *, struct glob_lim *);
static int	 globexp2(const Char *, const Char *, glob_t *,
		    struct glob_lim *);
static int	 match(Char *, Char *, Char *, int);
#ifdef DEBUG
static void	 qprintf(const char *, Char *);
#endif

int
glob(const char *pattern, int flags, int (*errfunc)(const char *, int),
    glob_t *pglob)
{
	const u_char *patnext;
	int c;
	Char *bufnext, *bufend, patbuf[MAXPATHLEN];
	struct glob_lim limit = { 0, 0, 0 };

	if (strnlen(pattern, PATH_MAX) == PATH_MAX)
		return(GLOB_NOMATCH);

	patnext = (u_char *) pattern;
	if (!(flags & GLOB_APPEND)) {
		pglob->gl_pathc = 0;
		pglob->gl_pathv = NULL;
		pglob->gl_statv = NULL;
		if (!(flags & GLOB_DOOFFS))
			pglob->gl_offs = 0;
	}
	pglob->gl_flags = flags & ~GLOB_MAGCHAR;
	pglob->gl_errfunc = errfunc;
	pglob->gl_matchc = 0;

	if (pglob->gl_offs < 0 || pglob->gl_pathc < 0 ||
	    pglob->gl_offs >= INT_MAX || pglob->gl_pathc >= INT_MAX ||
	    pglob->gl_pathc >= INT_MAX - pglob->gl_offs - 1)
		return GLOB_NOSPACE;

	bufnext = patbuf;
	bufend = bufnext + MAXPATHLEN - 1;
	if (flags & GLOB_NOESCAPE)
		while (bufnext < bufend && (c = *patnext++) != EOS)
			*bufnext++ = c;
	else {
		/* Protect the quoted characters. */
		while (bufnext < bufend && (c = *patnext++) != EOS)
			if (c == QUOTE) {
				if ((c = *patnext++) == EOS) {
					c = QUOTE;
					--patnext;
				}
				*bufnext++ = c | M_PROTECT;
			} else
				*bufnext++ = c;
	}
	*bufnext = EOS;

	if (flags & GLOB_BRACE)
		return globexp1(patbuf, pglob, &limit);
	else
		return glob0(patbuf, pglob, &limit);
}

/*
 * Expand recursively a glob {} pattern. When there is no more expansion
 * invoke the standard globbing routine to glob the rest of the magic
 * characters
 */
static int
globexp1(const Char *pattern, glob_t *pglob, struct glob_lim *limitp)
{
	const Char* ptr = pattern;

	/* Protect a single {}, for find(1), like csh */
	if (pattern[0] == LBRACE && pattern[1] == RBRACE && pattern[2] == EOS)
		return glob0(pattern, pglob, limitp);

	if ((ptr = (const Char *) g_strchr(ptr, LBRACE)) != NULL)
		return globexp2(ptr, pattern, pglob, limitp);

	return glob0(pattern, pglob, limitp);
}


/*
 * Recursive brace globbing helper. Tries to expand a single brace.
 * If it succeeds then it invokes globexp1 with the new pattern.
 * If it fails then it tries to glob the rest of the pattern and returns.
 */
static int
globexp2(const Char *ptr, const Char *pattern, glob_t *pglob,
    struct glob_lim *limitp)
{
	int     i, rv;
	Char   *lm, *ls;
	const Char *pe, *pm, *pl;
	Char    patbuf[MAXPATHLEN];

	/* copy part up to the brace */
	for (lm = patbuf, pm = pattern; pm != ptr; *lm++ = *pm++)
		;
	*lm = EOS;
	ls = lm;

	/* Find the balanced brace */
	for (i = 0, pe = ++ptr; *pe; pe++)
		if (*pe == LBRACKET) {
			/* Ignore everything between [] */
			for (pm = pe++; *pe != RBRACKET && *pe != EOS; pe++)
				;
			if (*pe == EOS) {
				/*
				 * We could not find a matching RBRACKET.
				 * Ignore and just look for RBRACE
				 */
				pe = pm;
			}
		} else if (*pe == LBRACE)
			i++;
		else if (*pe == RBRACE) {
			if (i == 0)
				break;
			i--;
		}

	/* Non matching braces; just glob the pattern */
	if (i != 0 || *pe == EOS)
		return glob0(patbuf, pglob, limitp);

	for (i = 0, pl = pm = ptr; pm <= pe; pm++) {
		switch (*pm) {
		case LBRACKET:
			/* Ignore everything between [] */
			for (pl = pm++; *pm != RBRACKET && *pm != EOS; pm++)
				;
			if (*pm == EOS) {
				/*
				 * We could not find a matching RBRACKET.
				 * Ignore and just look for RBRACE
				 */
				pm = pl;
			}
			break;

		case LBRACE:
			i++;
			break;

		case RBRACE:
			if (i) {
				i--;
				break;
			}
			/* FALLTHROUGH */
		case COMMA:
			if (i && *pm == COMMA)
				break;
			else {
				/* Append the current string */
				for (lm = ls; (pl < pm); *lm++ = *pl++)
					;

				/*
				 * Append the rest of the pattern after the
				 * closing brace
				 */
				for (pl = pe + 1; (*lm++ = *pl++) != EOS; )
					;

				/* Expand the current pattern */
#ifdef DEBUG
				qprintf("globexp2:", patbuf);
#endif
				rv = globexp1(patbuf, pglob, limitp);
				if (rv && rv != GLOB_NOMATCH)
					return rv;

				/* move after the comma, to the next string */
				pl = pm + 1;
			}
			break;

		default:
			break;
		}
	}
	return 0;
}



/*
 * expand tilde from the passwd file.
 */
static const Char *
globtilde(const Char *pattern, Char *patbuf, size_t patbuf_len, glob_t *pglob)
{
	struct passwd *pwd;
	char *h;
	const Char *p;
	Char *b, *eb;

	if (*pattern != TILDE || !(pglob->gl_flags & GLOB_TILDE))
		return pattern;

	/* Copy up to the end of the string or / */
	eb = &patbuf[patbuf_len - 1];
	for (p = pattern + 1, h = (char *) patbuf;
	    h < (char *)eb && *p && *p != SLASH; *h++ = *p++)
		;

	*h = EOS;

#if 0
	if (h == (char *)eb)
		return what;
#endif

	if (((char *) patbuf)[0] == EOS) {
		/*
		 * handle a plain ~ or ~/ by expanding $HOME
		 * first and then trying the password file
		 */
		if (issetugid() != 0 || (h = getenv("HOME")) == NULL) {
			if ((pwd = getpwuid(getuid())) == NULL)
				return pattern;
			else
				h = pwd->pw_dir;
		}
	} else {
		/*
		 * Expand a ~user
		 */
		if ((pwd = getpwnam((char*) patbuf)) == NULL)
			return pattern;
		else
			h = pwd->pw_dir;
	}

	/* Copy the home directory */
	for (b = patbuf; b < eb && *h; *b++ = *h++)
		;

	/* Append the rest of the pattern */
	while (b < eb && (*b++ = *p++) != EOS)
		;
	*b = EOS;

	return patbuf;
}

static int
g_strncmp(const Char *s1, const char *s2, size_t n)
{
	int rv = 0;

	while (n--) {
		rv = *(Char *)s1 - *(const unsigned char *)s2++;
		if (rv)
			break;
		if (*s1++ == '\0')
			break;
	}
	return rv;
}

static int
g_charclass(const Char **patternp, Char **bufnextp)
{
	const Char *pattern = *patternp + 1;
	Char *bufnext = *bufnextp;
	const Char *colon;
	struct cclass *cc;
	size_t len;

	if ((colon = g_strchr(pattern, ':')) == NULL || colon[1] != ']')
		return 1;	/* not a character class */

	len = (size_t)(colon - pattern);
	for (cc = cclasses; cc->name != NULL; cc++) {
		if (!g_strncmp(pattern, cc->name, len) && cc->name[len] == '\0')
			break;
	}
	if (cc->name == NULL)
		return -1;	/* invalid character class */
	*bufnext++ = M_CLASS;
	*bufnext++ = (Char)(cc - &cclasses[0]);
	*bufnextp = bufnext;
	*patternp += len + 3;

	return 0;
}

/*
 * The main glob() routine: compiles the pattern (optionally processing
 * quotes), calls glob1() to do the real pattern matching, and finally
 * sorts the list (unless unsorted operation is requested).  Returns 0
 * if things went well, nonzero if errors occurred.  It is not an error
 * to find no matches.
 */
static int
glob0(const Char *pattern, glob_t *pglob, struct glob_lim *limitp)
{
	const Char *qpatnext;
	int c, err, oldpathc;
	Char *bufnext, patbuf[MAXPATHLEN];

	qpatnext = globtilde(pattern, patbuf, MAXPATHLEN, pglob);
	oldpathc = pglob->gl_pathc;
	bufnext = patbuf;

	/* We don't need to check for buffer overflow any more. */
	while ((c = *qpatnext++) != EOS) {
		switch (c) {
		case LBRACKET:
			c = *qpatnext;
			if (c == NOT)
				++qpatnext;
			if (*qpatnext == EOS ||
			    g_strchr(qpatnext+1, RBRACKET) == NULL) {
				*bufnext++ = LBRACKET;
				if (c == NOT)
					--qpatnext;
				break;
			}
			*bufnext++ = M_SET;
			if (c == NOT)
				*bufnext++ = M_NOT;
			c = *qpatnext++;
			do {
				if (c == LBRACKET && *qpatnext == ':') {
					do {
						err = g_charclass(&qpatnext,
						    &bufnext);
						if (err)
							break;
						c = *qpatnext++;
					} while (c == LBRACKET && *qpatnext == ':');
					if (err == -1 &&
					    !(pglob->gl_flags & GLOB_NOCHECK))
						return GLOB_NOMATCH;
					if (c == RBRACKET)
						break;
				}
				*bufnext++ = CHAR(c);
				if (*qpatnext == RANGE &&
				    (c = qpatnext[1]) != RBRACKET) {
					*bufnext++ = M_RNG;
					*bufnext++ = CHAR(c);
					qpatnext += 2;
				}
			} while ((c = *qpatnext++) != RBRACKET);
			pglob->gl_flags |= GLOB_MAGCHAR;
			*bufnext++ = M_END;
			break;
		case QUESTION:
			pglob->gl_flags |= GLOB_MAGCHAR;
			*bufnext++ = M_ONE;
			break;
		case STAR:
			pglob->gl_flags |= GLOB_MAGCHAR;
			/* collapse adjacent stars to one,
			 * to avoid exponential behavior
			 */
			if (bufnext == patbuf || bufnext[-1] != M_ALL)
				*bufnext++ = M_ALL;
			break;
		default:
			*bufnext++ = CHAR(c);
			break;
		}
	}
	*bufnext = EOS;
#ifdef DEBUG
	qprintf("glob0:", patbuf);
#endif

	if ((err = glob1(patbuf, patbuf+MAXPATHLEN-1, pglob, limitp)) != 0)
		return(err);

	/*
	 * If there was no match we are going to append the pattern
	 * if GLOB_NOCHECK was specified or if GLOB_NOMAGIC was specified
	 * and the pattern did not contain any magic characters
	 * GLOB_NOMAGIC is there just for compatibility with csh.
	 */
	if (pglob->gl_pathc == oldpathc) {
		if ((pglob->gl_flags & GLOB_NOCHECK) ||
		    ((pglob->gl_flags & GLOB_NOMAGIC) &&
		    !(pglob->gl_flags & GLOB_MAGCHAR)))
			return(globextend(pattern, pglob, limitp, NULL));
		else
			return(GLOB_NOMATCH);
	}
	if (!(pglob->gl_flags & GLOB_NOSORT)) {
		if ((pglob->gl_flags & GLOB_KEEPSTAT)) {
			/* Keep the paths and stat info synced during sort */
			struct glob_path_stat *path_stat;
			int i;
			int n = pglob->gl_pathc - oldpathc;
			int o = pglob->gl_offs + oldpathc;

			if ((path_stat = calloc(n, sizeof(*path_stat))) == NULL)
				return GLOB_NOSPACE;
			for (i = 0; i < n; i++) {
				path_stat[i].gps_path = pglob->gl_pathv[o + i];
				path_stat[i].gps_stat = pglob->gl_statv[o + i];
			}
			qsort(path_stat, n, sizeof(*path_stat), compare_gps);
			for (i = 0; i < n; i++) {
				pglob->gl_pathv[o + i] = path_stat[i].gps_path;
				pglob->gl_statv[o + i] = path_stat[i].gps_stat;
			}
			free(path_stat);
		} else {
			qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc,
			    pglob->gl_pathc - oldpathc, sizeof(char *),
			    compare);
		}
	}
	return(0);
}

static int
compare(const void *p, const void *q)
{
	return(strcmp(*(char **)p, *(char **)q));
}

static int
compare_gps(const void *_p, const void *_q)
{
	const struct glob_path_stat *p = (const struct glob_path_stat *)_p;
	const struct glob_path_stat *q = (const struct glob_path_stat *)_q;

	return(strcmp(p->gps_path, q->gps_path));
}

static int
glob1(Char *pattern, Char *pattern_last, glob_t *pglob, struct glob_lim *limitp)
{
	Char pathbuf[MAXPATHLEN];

	/* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */
	if (*pattern == EOS)
		return(0);
	return(glob2(pathbuf, pathbuf+MAXPATHLEN-1,
	    pathbuf, pathbuf+MAXPATHLEN-1,
	    pattern, pattern_last, pglob, limitp));
}

/*
 * The functions glob2 and glob3 are mutually recursive; there is one level
 * of recursion for each segment in the pattern that contains one or more
 * meta characters.
 */
static int
glob2(Char *pathbuf, Char *pathbuf_last, Char *pathend, Char *pathend_last,
    Char *pattern, Char *pattern_last, glob_t *pglob, struct glob_lim *limitp)
{
	struct stat sb;
	Char *p, *q;
	int anymeta;

	/*
	 * Loop over pattern segments until end of pattern or until
	 * segment with meta character found.
	 */
	for (anymeta = 0;;) {
		if (*pattern == EOS) {		/* End of pattern? */
			*pathend = EOS;

			if ((pglob->gl_flags & GLOB_LIMIT) &&
			    limitp->glim_stat++ >= GLOB_LIMIT_STAT) {
				errno = 0;
				*pathend++ = SEP;
				*pathend = EOS;
				return(GLOB_NOSPACE);
			}
			if (g_lstat(pathbuf, &sb, pglob))
				return(0);

			if (((pglob->gl_flags & GLOB_MARK) &&
			    pathend[-1] != SEP) && (S_ISDIR(sb.st_mode) ||
			    (S_ISLNK(sb.st_mode) &&
			    (g_stat(pathbuf, &sb, pglob) == 0) &&
			    S_ISDIR(sb.st_mode)))) {
				if (pathend+1 > pathend_last)
					return (1);
				*pathend++ = SEP;
				*pathend = EOS;
			}
			++pglob->gl_matchc;
			return(globextend(pathbuf, pglob, limitp, &sb));
		}

		/* Find end of next segment, copy tentatively to pathend. */
		q = pathend;
		p = pattern;
		while (*p != EOS && *p != SEP) {
			if (ismeta(*p))
				anymeta = 1;
			if (q+1 > pathend_last)
				return (1);
			*q++ = *p++;
		}

		if (!anymeta) {		/* No expansion, do next segment. */
			pathend = q;
			pattern = p;
			while (*pattern == SEP) {
				if (pathend+1 > pathend_last)
					return (1);
				*pathend++ = *pattern++;
			}
		} else
			/* Need expansion, recurse. */
			return(glob3(pathbuf, pathbuf_last, pathend,
			    pathend_last, pattern, p, pattern_last,
			    pglob, limitp));
	}
	/* NOTREACHED */
}

static int
glob3(Char *pathbuf, Char *pathbuf_last, Char *pathend, Char *pathend_last,
    Char *pattern, Char *restpattern, Char *restpattern_last, glob_t *pglob,
    struct glob_lim *limitp)
{
	struct dirent *dp;
	DIR *dirp;
	int err;
	char buf[MAXPATHLEN];

	/*
	 * The readdirfunc declaration can't be prototyped, because it is
	 * assigned, below, to two functions which are prototyped in glob.h
	 * and dirent.h as taking pointers to differently typed opaque
	 * structures.
	 */
	struct dirent *(*readdirfunc)(void *);

	if (pathend > pathend_last)
		return (1);
	*pathend = EOS;
	errno = 0;

	if ((dirp = g_opendir(pathbuf, pglob)) == NULL) {
		/* TODO: don't call for ENOENT or ENOTDIR? */
		if (pglob->gl_errfunc) {
			if (g_Ctoc(pathbuf, buf, sizeof(buf)))
				return(GLOB_ABORTED);
			if (pglob->gl_errfunc(buf, errno) ||
			    pglob->gl_flags & GLOB_ERR)
				return(GLOB_ABORTED);
		}
		return(0);
	}

	err = 0;

	/* Search directory for matching names. */
	if (pglob->gl_flags & GLOB_ALTDIRFUNC)
		readdirfunc = pglob->gl_readdir;
	else
		readdirfunc = (struct dirent *(*)(void *))readdir;
	while ((dp = (*readdirfunc)(dirp))) {
		u_char *sc;
		Char *dc;

		if ((pglob->gl_flags & GLOB_LIMIT) &&
		    limitp->glim_readdir++ >= GLOB_LIMIT_READDIR) {
			errno = 0;
			*pathend++ = SEP;
			*pathend = EOS;
			err = GLOB_NOSPACE;
			break;
		}

		/* Initial DOT must be matched literally. */
		if (dp->d_name[0] == DOT && *pattern != DOT)
			continue;
		dc = pathend;
		sc = (u_char *) dp->d_name;
		while (dc < pathend_last && (*dc++ = *sc++) != EOS)
			;
		if (dc >= pathend_last) {
			*dc = EOS;
			err = 1;
			break;
		}

		if (!match(pathend, pattern, restpattern, GLOB_LIMIT_RECUR)) {
			*pathend = EOS;
			continue;
		}
		err = glob2(pathbuf, pathbuf_last, --dc, pathend_last,
		    restpattern, restpattern_last, pglob, limitp);
		if (err)
			break;
	}

	if (pglob->gl_flags & GLOB_ALTDIRFUNC)
		(*pglob->gl_closedir)(dirp);
	else
		closedir(dirp);
	return(err);
}


/*
 * Extend the gl_pathv member of a glob_t structure to accommodate a new item,
 * add the new item, and update gl_pathc.
 *
 * This assumes the BSD realloc, which only copies the block when its size
 * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
 * behavior.
 *
 * Return 0 if new item added, error code if memory couldn't be allocated.
 *
 * Invariant of the glob_t structure:
 *	Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
 *	gl_pathv points to (gl_offs + gl_pathc + 1) items.
 */
static int
globextend(const Char *path, glob_t *pglob, struct glob_lim *limitp,
    struct stat *sb)
{
	char **pathv;
	ssize_t i;
	size_t newn, len;
	char *copy = NULL;
	const Char *p;
	struct stat **statv;

	newn = 2 + pglob->gl_pathc + pglob->gl_offs;
	if (pglob->gl_offs >= INT_MAX ||
	    pglob->gl_pathc >= INT_MAX ||
	    newn >= INT_MAX ||
	    SIZE_MAX / sizeof(*pathv) <= newn ||
	    SIZE_MAX / sizeof(*statv) <= newn) {
 nospace:
		for (i = pglob->gl_offs; i < (ssize_t)(newn - 2); i++) {
			if (pglob->gl_pathv && pglob->gl_pathv[i])
				free(pglob->gl_pathv[i]);
			if ((pglob->gl_flags & GLOB_KEEPSTAT) != 0 &&
			    pglob->gl_pathv && pglob->gl_pathv[i])
				free(pglob->gl_statv[i]);
		}
		if (pglob->gl_pathv) {
			free(pglob->gl_pathv);
			pglob->gl_pathv = NULL;
		}
		if (pglob->gl_statv) {
			free(pglob->gl_statv);
			pglob->gl_statv = NULL;
		}
		return(GLOB_NOSPACE);
	}

	pathv = realloc(pglob->gl_pathv, newn * sizeof(*pathv));
	if (pathv == NULL)
		goto nospace;
	if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
		/* first time around -- clear initial gl_offs items */
		pathv += pglob->gl_offs;
		for (i = pglob->gl_offs; --i >= 0; )
			*--pathv = NULL;
	}
	pglob->gl_pathv = pathv;

	if ((pglob->gl_flags & GLOB_KEEPSTAT) != 0) {
		statv = realloc(pglob->gl_statv, newn * sizeof(*statv));
		if (statv == NULL)
			goto nospace;
		if (pglob->gl_statv == NULL && pglob->gl_offs > 0) {
			/* first time around -- clear initial gl_offs items */
			statv += pglob->gl_offs;
			for (i = pglob->gl_offs; --i >= 0; )
				*--statv = NULL;
		}
		pglob->gl_statv = statv;
		if (sb == NULL)
			statv[pglob->gl_offs + pglob->gl_pathc] = NULL;
		else {
			limitp->glim_malloc += sizeof(**statv);
			if ((pglob->gl_flags & GLOB_LIMIT) &&
			    limitp->glim_malloc >= GLOB_LIMIT_MALLOC) {
				errno = 0;
				return(GLOB_NOSPACE);
			}
			if ((statv[pglob->gl_offs + pglob->gl_pathc] =
			    malloc(sizeof(**statv))) == NULL)
				goto copy_error;
			memcpy(statv[pglob->gl_offs + pglob->gl_pathc], sb,
			    sizeof(*sb));
		}
		statv[pglob->gl_offs + pglob->gl_pathc + 1] = NULL;
	}

	for (p = path; *p++;)
		;
	len = (size_t)(p - path);
	limitp->glim_malloc += len;
	if ((copy = malloc(len)) != NULL) {
		if (g_Ctoc(path, copy, len)) {
			free(copy);
			return(GLOB_NOSPACE);
		}
		pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
	}
	pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;

	if ((pglob->gl_flags & GLOB_LIMIT) &&
	    (newn * sizeof(*pathv)) + limitp->glim_malloc >
	    GLOB_LIMIT_MALLOC) {
		errno = 0;
		return(GLOB_NOSPACE);
	}
 copy_error:
	return(copy == NULL ? GLOB_NOSPACE : 0);
}


/*
 * pattern matching function for filenames.  Each occurrence of the *
 * pattern causes a recursion level.
 */
static int
match(Char *name, Char *pat, Char *patend, int recur)
{
	int ok, negate_range;
	Char c, k;

	if (recur-- == 0)
		return(GLOB_NOSPACE);

	while (pat < patend) {
		c = *pat++;
		switch (c & M_MASK) {
		case M_ALL:
			while (pat < patend && (*pat & M_MASK) == M_ALL)
				pat++;	/* eat consecutive '*' */
			if (pat == patend)
				return(1);
			do {
			    if (match(name, pat, patend, recur))
				    return(1);
			} while (*name++ != EOS);
			return(0);
		case M_ONE:
			if (*name++ == EOS)
				return(0);
			break;
		case M_SET:
			ok = 0;
			if ((k = *name++) == EOS)
				return(0);
			if ((negate_range = ((*pat & M_MASK) == M_NOT)) != EOS)
				++pat;
			while (((c = *pat++) & M_MASK) != M_END) {
				if ((c & M_MASK) == M_CLASS) {
					Char idx = *pat & M_MASK;
					if (idx < NCCLASSES &&
					    cclasses[idx].isctype(k))
						ok = 1;
					++pat;
				}
				if ((*pat & M_MASK) == M_RNG) {
					if (c <= k && k <= pat[1])
						ok = 1;
					pat += 2;
				} else if (c == k)
					ok = 1;
			}
			if (ok == negate_range)
				return(0);
			break;
		default:
			if (*name++ != c)
				return(0);
			break;
		}
	}
	return(*name == EOS);
}

/* Free allocated data belonging to a glob_t structure. */
void
globfree(glob_t *pglob)
{
	int i;
	char **pp;

	if (pglob->gl_pathv != NULL) {
		pp = pglob->gl_pathv + pglob->gl_offs;
		for (i = pglob->gl_pathc; i--; ++pp)
			if (*pp)
				free(*pp);
		free(pglob->gl_pathv);
		pglob->gl_pathv = NULL;
	}
	if (pglob->gl_statv != NULL) {
		for (i = 0; i < pglob->gl_pathc; i++) {
			if (pglob->gl_statv[i] != NULL)
				free(pglob->gl_statv[i]);
		}
		free(pglob->gl_statv);
		pglob->gl_statv = NULL;
	}
}

static DIR *
g_opendir(Char *str, glob_t *pglob)
{
	char buf[MAXPATHLEN];

	if (!*str)
		strlcpy(buf, ".", sizeof buf);
	else {
		if (g_Ctoc(str, buf, sizeof(buf)))
			return(NULL);
	}

	if (pglob->gl_flags & GLOB_ALTDIRFUNC)
		return((*pglob->gl_opendir)(buf));

	return(opendir(buf));
}

static int
g_lstat(Char *fn, struct stat *sb, glob_t *pglob)
{
	char buf[MAXPATHLEN];

	if (g_Ctoc(fn, buf, sizeof(buf)))
		return(-1);
	if (pglob->gl_flags & GLOB_ALTDIRFUNC)
		return((*pglob->gl_lstat)(buf, sb));
	return(lstat(buf, sb));
}

static int
g_stat(Char *fn, struct stat *sb, glob_t *pglob)
{
	char buf[MAXPATHLEN];

	if (g_Ctoc(fn, buf, sizeof(buf)))
		return(-1);
	if (pglob->gl_flags & GLOB_ALTDIRFUNC)
		return((*pglob->gl_stat)(buf, sb));
	return(stat(buf, sb));
}

static Char *
g_strchr(const Char *str, int ch)
{
	do {
		if (*str == ch)
			return ((Char *)str);
	} while (*str++);
	return (NULL);
}

static int
g_Ctoc(const Char *str, char *buf, u_int len)
{

	while (len--) {
		if ((*buf++ = *str++) == EOS)
			return (0);
	}
	return (1);
}

#ifdef DEBUG
static void
qprintf(const char *str, Char *s)
{
	Char *p;

	(void)printf("%s:\n", str);
	for (p = s; *p; p++)
		(void)printf("%c", CHAR(*p));
	(void)printf("\n");
	for (p = s; *p; p++)
		(void)printf("%c", *p & M_PROTECT ? '"' : ' ');
	(void)printf("\n");
	for (p = s; *p; p++)
		(void)printf("%c", ismeta(*p) ? '_' : ' ');
	(void)printf("\n");
}
#endif