glob.c revision 207981 
1/*
2 * Copyright (c) 1989, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Guido van Rossum.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#if defined(LIBC_SCCS) && !defined(lint)
34static char sccsid[] = "@(#)glob.c	8.3 (Berkeley) 10/13/93";
35#endif /* LIBC_SCCS and not lint */
36#include <sys/cdefs.h>
37__FBSDID("$FreeBSD: head/lib/libc/gen/glob.c 207981 2010-05-12 17:44:00Z gordon $");
38
39/*
40 * glob(3) -- a superset of the one defined in POSIX 1003.2.
41 *
42 * The [!...] convention to negate a range is supported (SysV, Posix, ksh).
43 *
44 * Optional extra services, controlled by flags not defined by POSIX:
45 *
46 * GLOB_QUOTE:
47 *	Escaping convention: \ inhibits any special meaning the following
48 *	character might have (except \ at end of string is retained).
49 * GLOB_MAGCHAR:
50 *	Set in gl_flags if pattern contained a globbing character.
51 * GLOB_NOMAGIC:
52 *	Same as GLOB_NOCHECK, but it will only append pattern if it did
53 *	not contain any magic characters.  [Used in csh style globbing]
54 * GLOB_ALTDIRFUNC:
55 *	Use alternately specified directory access functions.
56 * GLOB_TILDE:
57 *	expand ~user/foo to the /home/dir/of/user/foo
58 * GLOB_BRACE:
59 *	expand {1,2}{a,b} to 1a 1b 2a 2b
60 * gl_matchc:
61 *	Number of matches in the current invocation of glob.
62 */
63
64/*
65 * Some notes on multibyte character support:
66 * 1. Patterns with illegal byte sequences match nothing - even if
67 *    GLOB_NOCHECK is specified.
68 * 2. Illegal byte sequences in filenames are handled by treating them as
69 *    single-byte characters with a value of the first byte of the sequence
70 *    cast to wchar_t.
71 * 3. State-dependent encodings are not currently supported.
72 */
73
74#include <sys/param.h>
75#include <sys/stat.h>
76
77#include <ctype.h>
78#include <dirent.h>
79#include <errno.h>
80#include <glob.h>
81#include <limits.h>
82#include <pwd.h>
83#include <stdint.h>
84#include <stdio.h>
85#include <stdlib.h>
86#include <string.h>
87#include <unistd.h>
88#include <wchar.h>
89
90#include "collate.h"
91
92#define	DOLLAR		'$'
93#define	DOT		'.'
94#define	EOS		'\0'
95#define	LBRACKET	'['
96#define	NOT		'!'
97#define	QUESTION	'?'
98#define	QUOTE		'\\'
99#define	RANGE		'-'
100#define	RBRACKET	']'
101#define	SEP		'/'
102#define	STAR		'*'
103#define	TILDE		'~'
104#define	UNDERSCORE	'_'
105#define	LBRACE		'{'
106#define	RBRACE		'}'
107#define	SLASH		'/'
108#define	COMMA		','
109
110#ifndef DEBUG
111
112#define	M_QUOTE		0x8000000000ULL
113#define	M_PROTECT	0x4000000000ULL
114#define	M_MASK		0xffffffffffULL
115#define	M_CHAR		0x00ffffffffULL
116
117typedef uint_fast64_t Char;
118
119#else
120
121#define	M_QUOTE		0x80
122#define	M_PROTECT	0x40
123#define	M_MASK		0xff
124#define	M_CHAR		0x7f
125
126typedef char Char;
127
128#endif
129
130
131#define	CHAR(c)		((Char)((c)&M_CHAR))
132#define	META(c)		((Char)((c)|M_QUOTE))
133#define	M_ALL		META('*')
134#define	M_END		META(']')
135#define	M_NOT		META('!')
136#define	M_ONE		META('?')
137#define	M_RNG		META('-')
138#define	M_SET		META('[')
139#define	ismeta(c)	(((c)&M_QUOTE) != 0)
140
141
142static int	 compare(const void *, const void *);
143static int	 g_Ctoc(const Char *, char *, size_t);
144static int	 g_lstat(Char *, struct stat *, glob_t *);
145static DIR	*g_opendir(Char *, glob_t *);
146static const Char *g_strchr(const Char *, wchar_t);
147#ifdef notdef
148static Char	*g_strcat(Char *, const Char *);
149#endif
150static int	 g_stat(Char *, struct stat *, glob_t *);
151static int	 glob0(const Char *, glob_t *, size_t *);
152static int	 glob1(Char *, glob_t *, size_t *);
153static int	 glob2(Char *, Char *, Char *, Char *, glob_t *, size_t *);
154static int	 glob3(Char *, Char *, Char *, Char *, Char *, glob_t *, size_t *);
155static int	 globextend(const Char *, glob_t *, size_t *);
156static const Char *
157		 globtilde(const Char *, Char *, size_t, glob_t *);
158static int	 globexp1(const Char *, glob_t *, size_t *);
159static int	 globexp2(const Char *, const Char *, glob_t *, int *, size_t *);
160static int	 match(Char *, Char *, Char *);
161#ifdef DEBUG
162static void	 qprintf(const char *, Char *);
163#endif
164
165int
166glob(const char *pattern, int flags, int (*errfunc)(const char *, int), glob_t *pglob)
167{
168	const char *patnext;
169	size_t limit;
170	Char *bufnext, *bufend, patbuf[MAXPATHLEN], prot;
171	mbstate_t mbs;
172	wchar_t wc;
173	size_t clen;
174
175	patnext = pattern;
176	if (!(flags & GLOB_APPEND)) {
177		pglob->gl_pathc = 0;
178		pglob->gl_pathv = NULL;
179		if (!(flags & GLOB_DOOFFS))
180			pglob->gl_offs = 0;
181	}
182	if (flags & GLOB_LIMIT) {
183		limit = pglob->gl_matchc;
184		if (limit == 0)
185			limit = ARG_MAX;
186	} else
187		limit = 0;
188	pglob->gl_flags = flags & ~GLOB_MAGCHAR;
189	pglob->gl_errfunc = errfunc;
190	pglob->gl_matchc = 0;
191
192	bufnext = patbuf;
193	bufend = bufnext + MAXPATHLEN - 1;
194	if (flags & GLOB_NOESCAPE) {
195		memset(&mbs, 0, sizeof(mbs));
196		while (bufend - bufnext >= MB_CUR_MAX) {
197			clen = mbrtowc(&wc, patnext, MB_LEN_MAX, &mbs);
198			if (clen == (size_t)-1 || clen == (size_t)-2)
199				return (GLOB_NOMATCH);
200			else if (clen == 0)
201				break;
202			*bufnext++ = wc;
203			patnext += clen;
204		}
205	} else {
206		/* Protect the quoted characters. */
207		memset(&mbs, 0, sizeof(mbs));
208		while (bufend - bufnext >= MB_CUR_MAX) {
209			if (*patnext == QUOTE) {
210				if (*++patnext == EOS) {
211					*bufnext++ = QUOTE | M_PROTECT;
212					continue;
213				}
214				prot = M_PROTECT;
215			} else
216				prot = 0;
217			clen = mbrtowc(&wc, patnext, MB_LEN_MAX, &mbs);
218			if (clen == (size_t)-1 || clen == (size_t)-2)
219				return (GLOB_NOMATCH);
220			else if (clen == 0)
221				break;
222			*bufnext++ = wc | prot;
223			patnext += clen;
224		}
225	}
226	*bufnext = EOS;
227
228	if (flags & GLOB_BRACE)
229	    return globexp1(patbuf, pglob, &limit);
230	else
231	    return glob0(patbuf, pglob, &limit);
232}
233
234/*
235 * Expand recursively a glob {} pattern. When there is no more expansion
236 * invoke the standard globbing routine to glob the rest of the magic
237 * characters
238 */
239static int
240globexp1(const Char *pattern, glob_t *pglob, size_t *limit)
241{
242	const Char* ptr = pattern;
243	int rv;
244
245	/* Protect a single {}, for find(1), like csh */
246	if (pattern[0] == LBRACE && pattern[1] == RBRACE && pattern[2] == EOS)
247		return glob0(pattern, pglob, limit);
248
249	while ((ptr = g_strchr(ptr, LBRACE)) != NULL)
250		if (!globexp2(ptr, pattern, pglob, &rv, limit))
251			return rv;
252
253	return glob0(pattern, pglob, limit);
254}
255
256
257/*
258 * Recursive brace globbing helper. Tries to expand a single brace.
259 * If it succeeds then it invokes globexp1 with the new pattern.
260 * If it fails then it tries to glob the rest of the pattern and returns.
261 */
262static int
263globexp2(const Char *ptr, const Char *pattern, glob_t *pglob, int *rv, size_t *limit)
264{
265	int     i;
266	Char   *lm, *ls;
267	const Char *pe, *pm, *pm1, *pl;
268	Char    patbuf[MAXPATHLEN];
269
270	/* copy part up to the brace */
271	for (lm = patbuf, pm = pattern; pm != ptr; *lm++ = *pm++)
272		continue;
273	*lm = EOS;
274	ls = lm;
275
276	/* Find the balanced brace */
277	for (i = 0, pe = ++ptr; *pe; pe++)
278		if (*pe == LBRACKET) {
279			/* Ignore everything between [] */
280			for (pm = pe++; *pe != RBRACKET && *pe != EOS; pe++)
281				continue;
282			if (*pe == EOS) {
283				/*
284				 * We could not find a matching RBRACKET.
285				 * Ignore and just look for RBRACE
286				 */
287				pe = pm;
288			}
289		}
290		else if (*pe == LBRACE)
291			i++;
292		else if (*pe == RBRACE) {
293			if (i == 0)
294				break;
295			i--;
296		}
297
298	/* Non matching braces; just glob the pattern */
299	if (i != 0 || *pe == EOS) {
300		*rv = glob0(patbuf, pglob, limit);
301		return 0;
302	}
303
304	for (i = 0, pl = pm = ptr; pm <= pe; pm++)
305		switch (*pm) {
306		case LBRACKET:
307			/* Ignore everything between [] */
308			for (pm1 = pm++; *pm != RBRACKET && *pm != EOS; pm++)
309				continue;
310			if (*pm == EOS) {
311				/*
312				 * We could not find a matching RBRACKET.
313				 * Ignore and just look for RBRACE
314				 */
315				pm = pm1;
316			}
317			break;
318
319		case LBRACE:
320			i++;
321			break;
322
323		case RBRACE:
324			if (i) {
325			    i--;
326			    break;
327			}
328			/* FALLTHROUGH */
329		case COMMA:
330			if (i && *pm == COMMA)
331				break;
332			else {
333				/* Append the current string */
334				for (lm = ls; (pl < pm); *lm++ = *pl++)
335					continue;
336				/*
337				 * Append the rest of the pattern after the
338				 * closing brace
339				 */
340				for (pl = pe + 1; (*lm++ = *pl++) != EOS;)
341					continue;
342
343				/* Expand the current pattern */
344#ifdef DEBUG
345				qprintf("globexp2:", patbuf);
346#endif
347				*rv = globexp1(patbuf, pglob, limit);
348
349				/* move after the comma, to the next string */
350				pl = pm + 1;
351			}
352			break;
353
354		default:
355			break;
356		}
357	*rv = 0;
358	return 0;
359}
360
361
362
363/*
364 * expand tilde from the passwd file.
365 */
366static const Char *
367globtilde(const Char *pattern, Char *patbuf, size_t patbuf_len, glob_t *pglob)
368{
369	struct passwd *pwd;
370	char *h;
371	const Char *p;
372	Char *b, *eb;
373
374	if (*pattern != TILDE || !(pglob->gl_flags & GLOB_TILDE))
375		return pattern;
376
377	/*
378	 * Copy up to the end of the string or /
379	 */
380	eb = &patbuf[patbuf_len - 1];
381	for (p = pattern + 1, h = (char *) patbuf;
382	    h < (char *)eb && *p && *p != SLASH; *h++ = *p++)
383		continue;
384
385	*h = EOS;
386
387	if (((char *) patbuf)[0] == EOS) {
388		/*
389		 * handle a plain ~ or ~/ by expanding $HOME first (iff
390		 * we're not running setuid or setgid) and then trying
391		 * the password file
392		 */
393		if (issetugid() != 0 ||
394		    (h = getenv("HOME")) == NULL) {
395			if (((h = getlogin()) != NULL &&
396			     (pwd = getpwnam(h)) != NULL) ||
397			    (pwd = getpwuid(getuid())) != NULL)
398				h = pwd->pw_dir;
399			else
400				return pattern;
401		}
402	}
403	else {
404		/*
405		 * Expand a ~user
406		 */
407		if ((pwd = getpwnam((char*) patbuf)) == NULL)
408			return pattern;
409		else
410			h = pwd->pw_dir;
411	}
412
413	/* Copy the home directory */
414	for (b = patbuf; b < eb && *h; *b++ = *h++)
415		continue;
416
417	/* Append the rest of the pattern */
418	while (b < eb && (*b++ = *p++) != EOS)
419		continue;
420	*b = EOS;
421
422	return patbuf;
423}
424
425
426/*
427 * The main glob() routine: compiles the pattern (optionally processing
428 * quotes), calls glob1() to do the real pattern matching, and finally
429 * sorts the list (unless unsorted operation is requested).  Returns 0
430 * if things went well, nonzero if errors occurred.
431 */
432static int
433glob0(const Char *pattern, glob_t *pglob, size_t *limit)
434{
435	const Char *qpatnext;
436	int err;
437	size_t oldpathc;
438	Char *bufnext, c, patbuf[MAXPATHLEN];
439
440	qpatnext = globtilde(pattern, patbuf, MAXPATHLEN, pglob);
441	oldpathc = pglob->gl_pathc;
442	bufnext = patbuf;
443
444	/* We don't need to check for buffer overflow any more. */
445	while ((c = *qpatnext++) != EOS) {
446		switch (c) {
447		case LBRACKET:
448			c = *qpatnext;
449			if (c == NOT)
450				++qpatnext;
451			if (*qpatnext == EOS ||
452			    g_strchr(qpatnext+1, RBRACKET) == NULL) {
453				*bufnext++ = LBRACKET;
454				if (c == NOT)
455					--qpatnext;
456				break;
457			}
458			*bufnext++ = M_SET;
459			if (c == NOT)
460				*bufnext++ = M_NOT;
461			c = *qpatnext++;
462			do {
463				*bufnext++ = CHAR(c);
464				if (*qpatnext == RANGE &&
465				    (c = qpatnext[1]) != RBRACKET) {
466					*bufnext++ = M_RNG;
467					*bufnext++ = CHAR(c);
468					qpatnext += 2;
469				}
470			} while ((c = *qpatnext++) != RBRACKET);
471			pglob->gl_flags |= GLOB_MAGCHAR;
472			*bufnext++ = M_END;
473			break;
474		case QUESTION:
475			pglob->gl_flags |= GLOB_MAGCHAR;
476			*bufnext++ = M_ONE;
477			break;
478		case STAR:
479			pglob->gl_flags |= GLOB_MAGCHAR;
480			/* collapse adjacent stars to one,
481			 * to avoid exponential behavior
482			 */
483			if (bufnext == patbuf || bufnext[-1] != M_ALL)
484			    *bufnext++ = M_ALL;
485			break;
486		default:
487			*bufnext++ = CHAR(c);
488			break;
489		}
490	}
491	*bufnext = EOS;
492#ifdef DEBUG
493	qprintf("glob0:", patbuf);
494#endif
495
496	if ((err = glob1(patbuf, pglob, limit)) != 0)
497		return(err);
498
499	/*
500	 * If there was no match we are going to append the pattern
501	 * if GLOB_NOCHECK was specified or if GLOB_NOMAGIC was specified
502	 * and the pattern did not contain any magic characters
503	 * GLOB_NOMAGIC is there just for compatibility with csh.
504	 */
505	if (pglob->gl_pathc == oldpathc) {
506		if (((pglob->gl_flags & GLOB_NOCHECK) ||
507		    ((pglob->gl_flags & GLOB_NOMAGIC) &&
508			!(pglob->gl_flags & GLOB_MAGCHAR))))
509			return(globextend(pattern, pglob, limit));
510		else
511			return(GLOB_NOMATCH);
512	}
513	if (!(pglob->gl_flags & GLOB_NOSORT))
514		qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc,
515		    pglob->gl_pathc - oldpathc, sizeof(char *), compare);
516	return(0);
517}
518
519static int
520compare(const void *p, const void *q)
521{
522	return(strcmp(*(char **)p, *(char **)q));
523}
524
525static int
526glob1(Char *pattern, glob_t *pglob, size_t *limit)
527{
528	Char pathbuf[MAXPATHLEN];
529
530	/* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */
531	if (*pattern == EOS)
532		return(0);
533	return(glob2(pathbuf, pathbuf, pathbuf + MAXPATHLEN - 1,
534	    pattern, pglob, limit));
535}
536
537/*
538 * The functions glob2 and glob3 are mutually recursive; there is one level
539 * of recursion for each segment in the pattern that contains one or more
540 * meta characters.
541 */
542static int
543glob2(Char *pathbuf, Char *pathend, Char *pathend_last, Char *pattern,
544      glob_t *pglob, size_t *limit)
545{
546	struct stat sb;
547	Char *p, *q;
548	int anymeta;
549
550	/*
551	 * Loop over pattern segments until end of pattern or until
552	 * segment with meta character found.
553	 */
554	for (anymeta = 0;;) {
555		if (*pattern == EOS) {		/* End of pattern? */
556			*pathend = EOS;
557			if (g_lstat(pathbuf, &sb, pglob))
558				return(0);
559
560			if (((pglob->gl_flags & GLOB_MARK) &&
561			    pathend[-1] != SEP) && (S_ISDIR(sb.st_mode)
562			    || (S_ISLNK(sb.st_mode) &&
563			    (g_stat(pathbuf, &sb, pglob) == 0) &&
564			    S_ISDIR(sb.st_mode)))) {
565				if (pathend + 1 > pathend_last)
566					return (GLOB_ABORTED);
567				*pathend++ = SEP;
568				*pathend = EOS;
569			}
570			++pglob->gl_matchc;
571			return(globextend(pathbuf, pglob, limit));
572		}
573
574		/* Find end of next segment, copy tentatively to pathend. */
575		q = pathend;
576		p = pattern;
577		while (*p != EOS && *p != SEP) {
578			if (ismeta(*p))
579				anymeta = 1;
580			if (q + 1 > pathend_last)
581				return (GLOB_ABORTED);
582			*q++ = *p++;
583		}
584
585		if (!anymeta) {		/* No expansion, do next segment. */
586			pathend = q;
587			pattern = p;
588			while (*pattern == SEP) {
589				if (pathend + 1 > pathend_last)
590					return (GLOB_ABORTED);
591				*pathend++ = *pattern++;
592			}
593		} else			/* Need expansion, recurse. */
594			return(glob3(pathbuf, pathend, pathend_last, pattern, p,
595			    pglob, limit));
596	}
597	/* NOTREACHED */
598}
599
600static int
601glob3(Char *pathbuf, Char *pathend, Char *pathend_last,
602      Char *pattern, Char *restpattern,
603      glob_t *pglob, size_t *limit)
604{
605	struct dirent *dp;
606	DIR *dirp;
607	int err;
608	char buf[MAXPATHLEN];
609
610	/*
611	 * The readdirfunc declaration can't be prototyped, because it is
612	 * assigned, below, to two functions which are prototyped in glob.h
613	 * and dirent.h as taking pointers to differently typed opaque
614	 * structures.
615	 */
616	struct dirent *(*readdirfunc)();
617
618	if (pathend > pathend_last)
619		return (GLOB_ABORTED);
620	*pathend = EOS;
621	errno = 0;
622
623	if ((dirp = g_opendir(pathbuf, pglob)) == NULL) {
624		/* TODO: don't call for ENOENT or ENOTDIR? */
625		if (pglob->gl_errfunc) {
626			if (g_Ctoc(pathbuf, buf, sizeof(buf)))
627				return (GLOB_ABORTED);
628			if (pglob->gl_errfunc(buf, errno) ||
629			    pglob->gl_flags & GLOB_ERR)
630				return (GLOB_ABORTED);
631		}
632		return(0);
633	}
634
635	err = 0;
636
637	/* Search directory for matching names. */
638	if (pglob->gl_flags & GLOB_ALTDIRFUNC)
639		readdirfunc = pglob->gl_readdir;
640	else
641		readdirfunc = readdir;
642	while ((dp = (*readdirfunc)(dirp))) {
643		char *sc;
644		Char *dc;
645		wchar_t wc;
646		size_t clen;
647		mbstate_t mbs;
648
649		/* Initial DOT must be matched literally. */
650		if (dp->d_name[0] == DOT && *pattern != DOT)
651			continue;
652		memset(&mbs, 0, sizeof(mbs));
653		dc = pathend;
654		sc = dp->d_name;
655		while (dc < pathend_last) {
656			clen = mbrtowc(&wc, sc, MB_LEN_MAX, &mbs);
657			if (clen == (size_t)-1 || clen == (size_t)-2) {
658				wc = *sc;
659				clen = 1;
660				memset(&mbs, 0, sizeof(mbs));
661			}
662			if ((*dc++ = wc) == EOS)
663				break;
664			sc += clen;
665		}
666		if (!match(pathend, pattern, restpattern)) {
667			*pathend = EOS;
668			continue;
669		}
670		err = glob2(pathbuf, --dc, pathend_last, restpattern,
671		    pglob, limit);
672		if (err)
673			break;
674	}
675
676	if (pglob->gl_flags & GLOB_ALTDIRFUNC)
677		(*pglob->gl_closedir)(dirp);
678	else
679		closedir(dirp);
680	return(err);
681}
682
683
684/*
685 * Extend the gl_pathv member of a glob_t structure to accomodate a new item,
686 * add the new item, and update gl_pathc.
687 *
688 * This assumes the BSD realloc, which only copies the block when its size
689 * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
690 * behavior.
691 *
692 * Return 0 if new item added, error code if memory couldn't be allocated.
693 *
694 * Invariant of the glob_t structure:
695 *	Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
696 *	gl_pathv points to (gl_offs + gl_pathc + 1) items.
697 */
698static int
699globextend(const Char *path, glob_t *pglob, size_t *limit)
700{
701	char **pathv;
702	size_t i, newsize, len;
703	char *copy;
704	const Char *p;
705
706	if (*limit && pglob->gl_pathc > *limit) {
707		errno = 0;
708		return (GLOB_NOSPACE);
709	}
710
711	newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs);
712	pathv = pglob->gl_pathv ?
713		    realloc((char *)pglob->gl_pathv, newsize) :
714		    malloc(newsize);
715	if (pathv == NULL) {
716		if (pglob->gl_pathv) {
717			free(pglob->gl_pathv);
718			pglob->gl_pathv = NULL;
719		}
720		return(GLOB_NOSPACE);
721	}
722
723	if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
724		/* first time around -- clear initial gl_offs items */
725		pathv += pglob->gl_offs;
726		for (i = pglob->gl_offs + 1; --i > 0; )
727			*--pathv = NULL;
728	}
729	pglob->gl_pathv = pathv;
730
731	for (p = path; *p++;)
732		continue;
733	len = MB_CUR_MAX * (size_t)(p - path);	/* XXX overallocation */
734	if ((copy = malloc(len)) != NULL) {
735		if (g_Ctoc(path, copy, len)) {
736			free(copy);
737			return (GLOB_NOSPACE);
738		}
739		pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
740	}
741	pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
742	return(copy == NULL ? GLOB_NOSPACE : 0);
743}
744
745/*
746 * pattern matching function for filenames.  Each occurrence of the *
747 * pattern causes a recursion level.
748 */
749static int
750match(Char *name, Char *pat, Char *patend)
751{
752	int ok, negate_range;
753	Char c, k;
754
755	while (pat < patend) {
756		c = *pat++;
757		switch (c & M_MASK) {
758		case M_ALL:
759			if (pat == patend)
760				return(1);
761			do
762			    if (match(name, pat, patend))
763				    return(1);
764			while (*name++ != EOS);
765			return(0);
766		case M_ONE:
767			if (*name++ == EOS)
768				return(0);
769			break;
770		case M_SET:
771			ok = 0;
772			if ((k = *name++) == EOS)
773				return(0);
774			if ((negate_range = ((*pat & M_MASK) == M_NOT)) != EOS)
775				++pat;
776			while (((c = *pat++) & M_MASK) != M_END)
777				if ((*pat & M_MASK) == M_RNG) {
778					if (__collate_load_error ?
779					    CHAR(c) <= CHAR(k) && CHAR(k) <= CHAR(pat[1]) :
780					       __collate_range_cmp(CHAR(c), CHAR(k)) <= 0
781					    && __collate_range_cmp(CHAR(k), CHAR(pat[1])) <= 0
782					   )
783						ok = 1;
784					pat += 2;
785				} else if (c == k)
786					ok = 1;
787			if (ok == negate_range)
788				return(0);
789			break;
790		default:
791			if (*name++ != c)
792				return(0);
793			break;
794		}
795	}
796	return(*name == EOS);
797}
798
799/* Free allocated data belonging to a glob_t structure. */
800void
801globfree(glob_t *pglob)
802{
803	size_t i;
804	char **pp;
805
806	if (pglob->gl_pathv != NULL) {
807		pp = pglob->gl_pathv + pglob->gl_offs;
808		for (i = pglob->gl_pathc; i--; ++pp)
809			if (*pp)
810				free(*pp);
811		free(pglob->gl_pathv);
812		pglob->gl_pathv = NULL;
813	}
814}
815
816static DIR *
817g_opendir(Char *str, glob_t *pglob)
818{
819	char buf[MAXPATHLEN];
820
821	if (!*str)
822		strcpy(buf, ".");
823	else {
824		if (g_Ctoc(str, buf, sizeof(buf)))
825			return (NULL);
826	}
827
828	if (pglob->gl_flags & GLOB_ALTDIRFUNC)
829		return((*pglob->gl_opendir)(buf));
830
831	return(opendir(buf));
832}
833
834static int
835g_lstat(Char *fn, struct stat *sb, glob_t *pglob)
836{
837	char buf[MAXPATHLEN];
838
839	if (g_Ctoc(fn, buf, sizeof(buf))) {
840		errno = ENAMETOOLONG;
841		return (-1);
842	}
843	if (pglob->gl_flags & GLOB_ALTDIRFUNC)
844		return((*pglob->gl_lstat)(buf, sb));
845	return(lstat(buf, sb));
846}
847
848static int
849g_stat(Char *fn, struct stat *sb, glob_t *pglob)
850{
851	char buf[MAXPATHLEN];
852
853	if (g_Ctoc(fn, buf, sizeof(buf))) {
854		errno = ENAMETOOLONG;
855		return (-1);
856	}
857	if (pglob->gl_flags & GLOB_ALTDIRFUNC)
858		return((*pglob->gl_stat)(buf, sb));
859	return(stat(buf, sb));
860}
861
862static const Char *
863g_strchr(const Char *str, wchar_t ch)
864{
865
866	do {
867		if (*str == ch)
868			return (str);
869	} while (*str++);
870	return (NULL);
871}
872
873static int
874g_Ctoc(const Char *str, char *buf, size_t len)
875{
876	mbstate_t mbs;
877	size_t clen;
878
879	memset(&mbs, 0, sizeof(mbs));
880	while (len >= MB_CUR_MAX) {
881		clen = wcrtomb(buf, *str, &mbs);
882		if (clen == (size_t)-1)
883			return (1);
884		if (*str == L'\0')
885			return (0);
886		str++;
887		buf += clen;
888		len -= clen;
889	}
890	return (1);
891}
892
893#ifdef DEBUG
894static void
895qprintf(const char *str, Char *s)
896{
897	Char *p;
898
899	(void)printf("%s:\n", str);
900	for (p = s; *p; p++)
901		(void)printf("%c", CHAR(*p));
902	(void)printf("\n");
903	for (p = s; *p; p++)
904		(void)printf("%c", *p & M_PROTECT ? '"' : ' ');
905	(void)printf("\n");
906	for (p = s; *p; p++)
907		(void)printf("%c", ismeta(*p) ? '_' : ' ');
908	(void)printf("\n");
909}
910#endif
911