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
38static 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 $");
41#endif
42#endif /* LIBC_SCCS and not lint */
43
44/*
45 * glob(3) -- a superset of the one defined in POSIX 1003.2.
46 *
47 * The [!...] convention to negate a range is supported (SysV, Posix, ksh).
48 *
49 * Optional extra services, controlled by flags not defined by POSIX:
50 *
51 * GLOB_MAGCHAR:
52 *	Set in gl_flags if pattern contained a globbing character.
53 * GLOB_NOMAGIC:
54 *	Same as GLOB_NOCHECK, but it will only append pattern if it did
55 *	not contain any magic characters.  [Used in csh style globbing]
56 * GLOB_ALTDIRFUNC:
57 *	Use alternately specified directory access functions.
58 * GLOB_TILDE:
59 *	expand ~user/foo to the /home/dir/of/user/foo
60 * GLOB_BRACE:
61 *	expand {1,2}{a,b} to 1a 1b 2a 2b
62 * GLOB_PERIOD:
63 *	allow metacharacters to match leading dots in filenames.
64 * GLOB_NO_DOTDIRS:
65 *	. and .. are hidden from wildcards, even if GLOB_PERIOD is set.
66 * gl_matchc:
67 *	Number of matches in the current invocation of glob.
68 */
69
70//#include "namespace.h"
71#include <sys/param.h>
72#include <sys/stat.h>
73
74#include <assert.h>
75#include <ctype.h>
76#include <dirent.h>
77#include <errno.h>
78#include <glob.h>
79#include <pwd.h>
80#include <stdio.h>
81#include <stddef.h>
82#include <stdlib.h>
83#include <string.h>
84#include <unistd.h>
85
86#ifdef HAVE_NBTOOL_CONFIG_H
87#define NO_GETPW_R
88#endif
89
90#define	GLOB_LIMIT_STRING	65536	/* number of readdirs */
91#define	GLOB_LIMIT_STAT		128	/* number of stat system calls */
92#define	GLOB_LIMIT_READDIR	16384	/* total buffer size of path strings */
93#define	GLOB_LIMIT_PATH		1024	/* number of path elements */
94#define GLOB_LIMIT_BRACE	128	/* Number of brace calls */
95
96struct glob_limit {
97	size_t l_string;
98	size_t l_stat;
99	size_t l_readdir;
100	size_t l_brace;
101};
102
103/*
104 * XXX: For NetBSD 1.4.x compatibility. (kill me l8r)
105 */
106#ifndef _DIAGASSERT
107#define _DIAGASSERT(a)
108#endif
109
110#define	DOLLAR		'$'
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
135typedef 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
144typedef 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
160static int	 compare(const void *, const void *);
161static int	 g_Ctoc(const Char *, char *, size_t);
162static int	 g_lstat(Char *, __gl_stat_t  *, glob_t *);
163static DIR	*g_opendir(Char *, glob_t *);
164static Char	*g_strchr(const Char *, int);
165static int	 g_stat(Char *, __gl_stat_t *, glob_t *);
166static int	 glob0(const Char *, glob_t *, struct glob_limit *);
167static int	 glob1(Char *, glob_t *, struct glob_limit *);
168static int	 glob2(Char *, Char *, Char *, const Char *, glob_t *,
169    struct glob_limit *);
170static int	 glob3(Char *, Char *, Char *, const Char *, const Char *,
171    const Char *, glob_t *, struct glob_limit *);
172static int	 globextend(const Char *, glob_t *, struct glob_limit *);
173static const Char *globtilde(const Char *, Char *, size_t, glob_t *);
174static int	 globexp1(const Char *, glob_t *, struct glob_limit *);
175static int	 globexp2(const Char *, const Char *, glob_t *, int *,
176    struct glob_limit *);
177static int	 match(const Char *, const Char *, const Char *);
178#ifdef DEBUG
179static void	 qprintf(const char *, Char *);
180#endif
181
182int
183glob(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 */
235static int
236globexp1(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 */
267static int
268globexp2(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 */
381static const Char *
382globtilde(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 */
473static int
474glob0(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
572static int
573compare(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
582static int
583glob1(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 */
607static int
608glob2(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
681static int
682glob3(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 */
886static int
887globextend(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;
932nospace:
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 */
942static int
943match(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. */
994void
995globfree(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__
1014int
1015glob_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
1046static DIR *
1047g_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
1067static int
1068g_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
1083static int
1084g_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
1099static Char *
1100g_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
1112static int
1113g_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
1130static void
1131qprintf(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