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      1 /*	$NetBSD: glob.c,v 1.35 2013/03/20 23:44:47 lukem Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1989, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * Guido van Rossum.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. Neither the name of the University nor the names of its contributors
     19  *    may be used to endorse or promote products derived from this software
     20  *    without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  */
     34 
     35 #include <sys/cdefs.h>
     36 #if defined(LIBC_SCCS) && !defined(lint)
     37 #if 0
     38 static char sccsid[] = "@(#)glob.c	8.3 (Berkeley) 10/13/93";
     39 #else
     40 __RCSID("$NetBSD: glob.c,v 1.35 2013/03/20 23:44:47 lukem Exp $");
     41 #endif
     42 #endif /* LIBC_SCCS and not lint */
     43 
     44 /*
     45  * glob(3) -- a superset of the one defined in POSIX 1003.2.
     46  *
     47  * The [!...] convention to negate a range is supported (SysV, Posix, ksh).
     48  *
     49  * Optional extra services, controlled by flags not defined by POSIX:
     50  *
     51  * GLOB_MAGCHAR:
     52  *	Set in gl_flags if pattern contained a globbing character.
     53  * GLOB_NOMAGIC:
     54  *	Same as GLOB_NOCHECK, but it will only append pattern if it did
     55  *	not contain any magic characters.  [Used in csh style globbing]
     56  * GLOB_ALTDIRFUNC:
     57  *	Use alternately specified directory access functions.
     58  * GLOB_TILDE:
     59  *	expand ~user/foo to the /home/dir/of/user/foo
     60  * GLOB_BRACE:
     61  *	expand {1,2}{a,b} to 1a 1b 2a 2b
     62  * GLOB_PERIOD:
     63  *	allow metacharacters to match leading dots in filenames.
     64  * GLOB_NO_DOTDIRS:
     65  *	. and .. are hidden from wildcards, even if GLOB_PERIOD is set.
     66  * gl_matchc:
     67  *	Number of matches in the current invocation of glob.
     68  */
     69 
     70 //#include "namespace.h"
     71 #include <sys/param.h>
     72 #include <sys/stat.h>
     73 
     74 #include <assert.h>
     75 #include <ctype.h>
     76 #include <dirent.h>
     77 #include <errno.h>
     78 #include <glob.h>
     79 #include <pwd.h>
     80 #include <stdio.h>
     81 #include <stddef.h>
     82 #include <stdlib.h>
     83 #include <string.h>
     84 #include <unistd.h>
     85 
     86 #ifdef HAVE_NBTOOL_CONFIG_H
     87 #define NO_GETPW_R
     88 #endif
     89 
     90 #define	GLOB_LIMIT_STRING	65536	/* number of readdirs */
     91 #define	GLOB_LIMIT_STAT		128	/* number of stat system calls */
     92 #define	GLOB_LIMIT_READDIR	16384	/* total buffer size of path strings */
     93 #define	GLOB_LIMIT_PATH		1024	/* number of path elements */
     94 #define GLOB_LIMIT_BRACE	128	/* Number of brace calls */
     95 
     96 struct glob_limit {
     97 	size_t l_string;
     98 	size_t l_stat;
     99 	size_t l_readdir;
    100 	size_t l_brace;
    101 };
    102 
    103 /*
    104  * XXX: For NetBSD 1.4.x compatibility. (kill me l8r)
    105  */
    106 #ifndef _DIAGASSERT
    107 #define _DIAGASSERT(a)
    108 #endif
    109 
    110 #define	DOLLAR		'$'
    111 #define	DOT		'.'
    112 #define	EOS		'\0'
    113 #define	LBRACKET	'['
    114 #define	NOT		'!'
    115 #define	QUESTION	'?'
    116 #define	QUOTE		'\\'
    117 #define	RANGE		'-'
    118 #define	RBRACKET	']'
    119 #define	SEP		'/'
    120 #define	STAR		'*'
    121 #define	TILDE		'~'
    122 #define	UNDERSCORE	'_'
    123 #define	LBRACE		'{'
    124 #define	RBRACE		'}'
    125 #define	SLASH		'/'
    126 #define	COMMA		','
    127 
    128 #ifndef USE_8BIT_CHARS
    129 
    130 #define	M_QUOTE		0x8000
    131 #define	M_PROTECT	0x4000
    132 #define	M_MASK		0xffff
    133 #define	M_ASCII		0x00ff
    134 
    135 typedef unsigned short Char;
    136 
    137 #else
    138 
    139 #define	M_QUOTE		(Char)0x80
    140 #define	M_PROTECT	(Char)0x40
    141 #define	M_MASK		(Char)0xff
    142 #define	M_ASCII		(Char)0x7f
    143 
    144 typedef char Char;
    145 
    146 #endif
    147 
    148 
    149 #define	CHAR(c)		((Char)((c)&M_ASCII))
    150 #define	META(c)		((Char)((c)|M_QUOTE))
    151 #define	M_ALL		META('*')
    152 #define	M_END		META(']')
    153 #define	M_NOT		META('!')
    154 #define	M_ONE		META('?')
    155 #define	M_RNG		META('-')
    156 #define	M_SET		META('[')
    157 #define	ismeta(c)	(((c)&M_QUOTE) != 0)
    158 
    159 
    160 static int	 compare(const void *, const void *);
    161 static int	 g_Ctoc(const Char *, char *, size_t);
    162 static int	 g_lstat(Char *, __gl_stat_t  *, glob_t *);
    163 static DIR	*g_opendir(Char *, glob_t *);
    164 static Char	*g_strchr(const Char *, int);
    165 static int	 g_stat(Char *, __gl_stat_t *, glob_t *);
    166 static int	 glob0(const Char *, glob_t *, struct glob_limit *);
    167 static int	 glob1(Char *, glob_t *, struct glob_limit *);
    168 static int	 glob2(Char *, Char *, Char *, const Char *, glob_t *,
    169     struct glob_limit *);
    170 static int	 glob3(Char *, Char *, Char *, const Char *, const Char *,
    171     const Char *, glob_t *, struct glob_limit *);
    172 static int	 globextend(const Char *, glob_t *, struct glob_limit *);
    173 static const Char *globtilde(const Char *, Char *, size_t, glob_t *);
    174 static int	 globexp1(const Char *, glob_t *, struct glob_limit *);
    175 static int	 globexp2(const Char *, const Char *, glob_t *, int *,
    176     struct glob_limit *);
    177 static int	 match(const Char *, const Char *, const Char *);
    178 #ifdef DEBUG
    179 static void	 qprintf(const char *, Char *);
    180 #endif
    181 
    182 int
    183 glob(const char * __restrict pattern, int flags, int (*errfunc)(const char *,
    184     int), glob_t * __restrict pglob)
    185 {
    186 	const unsigned char *patnext;
    187 	int c;
    188 	Char *bufnext, *bufend, patbuf[MAXPATHLEN+1];
    189 	struct glob_limit limit = { 0, 0, 0, 0 };
    190 
    191 	_DIAGASSERT(pattern != NULL);
    192 
    193 	patnext = (const unsigned char *) pattern;
    194 	if (!(flags & GLOB_APPEND)) {
    195 		pglob->gl_pathc = 0;
    196 		pglob->gl_pathv = NULL;
    197 		if (!(flags & GLOB_DOOFFS))
    198 			pglob->gl_offs = 0;
    199 	}
    200 	pglob->gl_flags = flags & ~GLOB_MAGCHAR;
    201 	pglob->gl_errfunc = errfunc;
    202 	pglob->gl_matchc = 0;
    203 
    204 	bufnext = patbuf;
    205 	bufend = bufnext + MAXPATHLEN;
    206 	if (flags & GLOB_NOESCAPE) {
    207 		while (bufnext < bufend && (c = *patnext++) != EOS)
    208 			*bufnext++ = c;
    209 	} else {
    210 		/* Protect the quoted characters. */
    211 		while (bufnext < bufend && (c = *patnext++) != EOS)
    212 			if (c == QUOTE) {
    213 				if ((c = *patnext++) == EOS) {
    214 					c = QUOTE;
    215 					--patnext;
    216 				}
    217 				*bufnext++ = c | M_PROTECT;
    218 			}
    219 			else
    220 				*bufnext++ = c;
    221 	}
    222 	*bufnext = EOS;
    223 
    224 	if (flags & GLOB_BRACE)
    225 	    return globexp1(patbuf, pglob, &limit);
    226 	else
    227 	    return glob0(patbuf, pglob, &limit);
    228 }
    229 
    230 /*
    231  * Expand recursively a glob {} pattern. When there is no more expansion
    232  * invoke the standard globbing routine to glob the rest of the magic
    233  * characters
    234  */
    235 static int
    236 globexp1(const Char *pattern, glob_t *pglob, struct glob_limit *limit)
    237 {
    238 	const Char* ptr = pattern;
    239 	int rv;
    240 
    241 	_DIAGASSERT(pattern != NULL);
    242 	_DIAGASSERT(pglob != NULL);
    243 
    244 	if ((pglob->gl_flags & GLOB_LIMIT) &&
    245 	    limit->l_brace++ >= GLOB_LIMIT_BRACE) {
    246 		errno = 0;
    247 		return GLOB_NOSPACE;
    248 	}
    249 
    250 	/* Protect a single {}, for find(1), like csh */
    251 	if (pattern[0] == LBRACE && pattern[1] == RBRACE && pattern[2] == EOS)
    252 		return glob0(pattern, pglob, limit);
    253 
    254 	while ((ptr = (const Char *) g_strchr(ptr, LBRACE)) != NULL)
    255 		if (!globexp2(ptr, pattern, pglob, &rv, limit))
    256 			return rv;
    257 
    258 	return glob0(pattern, pglob, limit);
    259 }
    260 
    261 
    262 /*
    263  * Recursive brace globbing helper. Tries to expand a single brace.
    264  * If it succeeds then it invokes globexp1 with the new pattern.
    265  * If it fails then it tries to glob the rest of the pattern and returns.
    266  */
    267 static int
    268 globexp2(const Char *ptr, const Char *pattern, glob_t *pglob, int *rv,
    269     struct glob_limit *limit)
    270 {
    271 	int     i;
    272 	Char   *lm, *ls;
    273 	const Char *pe, *pm, *pl;
    274 	Char    patbuf[MAXPATHLEN + 1];
    275 
    276 	_DIAGASSERT(ptr != NULL);
    277 	_DIAGASSERT(pattern != NULL);
    278 	_DIAGASSERT(pglob != NULL);
    279 	_DIAGASSERT(rv != NULL);
    280 
    281 	/* copy part up to the brace */
    282 	for (lm = patbuf, pm = pattern; pm != ptr; *lm++ = *pm++)
    283 		continue;
    284 	ls = lm;
    285 
    286 	/* Find the balanced brace */
    287 	for (i = 0, pe = ++ptr; *pe; pe++)
    288 		if (*pe == LBRACKET) {
    289 			/* Ignore everything between [] */
    290 			for (pm = pe++; *pe != RBRACKET && *pe != EOS; pe++)
    291 				continue;
    292 			if (*pe == EOS) {
    293 				/*
    294 				 * We could not find a matching RBRACKET.
    295 				 * Ignore and just look for RBRACE
    296 				 */
    297 				pe = pm;
    298 			}
    299 		}
    300 		else if (*pe == LBRACE)
    301 			i++;
    302 		else if (*pe == RBRACE) {
    303 			if (i == 0)
    304 				break;
    305 			i--;
    306 		}
    307 
    308 	/* Non matching braces; just glob the pattern */
    309 	if (i != 0 || *pe == EOS) {
    310 		/*
    311 		 * we use `pattern', not `patbuf' here so that that
    312 		 * unbalanced braces are passed to the match
    313 		 */
    314 		*rv = glob0(pattern, pglob, limit);
    315 		return 0;
    316 	}
    317 
    318 	for (i = 0, pl = pm = ptr; pm <= pe; pm++) {
    319 		switch (*pm) {
    320 		case LBRACKET:
    321 			/* Ignore everything between [] */
    322 			for (pl = pm++; *pm != RBRACKET && *pm != EOS; pm++)
    323 				continue;
    324 			if (*pm == EOS) {
    325 				/*
    326 				 * We could not find a matching RBRACKET.
    327 				 * Ignore and just look for RBRACE
    328 				 */
    329 				pm = pl;
    330 			}
    331 			break;
    332 
    333 		case LBRACE:
    334 			i++;
    335 			break;
    336 
    337 		case RBRACE:
    338 			if (i) {
    339 				i--;
    340 				break;
    341 			}
    342 			/* FALLTHROUGH */
    343 		case COMMA:
    344 			if (i && *pm == COMMA)
    345 				break;
    346 			else {
    347 				/* Append the current string */
    348 				for (lm = ls; (pl < pm); *lm++ = *pl++)
    349 					continue;
    350 				/*
    351 				 * Append the rest of the pattern after the
    352 				 * closing brace
    353 				 */
    354 				for (pl = pe + 1; (*lm++ = *pl++) != EOS;)
    355 					continue;
    356 
    357 				/* Expand the current pattern */
    358 #ifdef DEBUG
    359 				qprintf("globexp2", patbuf);
    360 #endif
    361 				*rv = globexp1(patbuf, pglob, limit);
    362 
    363 				/* move after the comma, to the next string */
    364 				pl = pm + 1;
    365 			}
    366 			break;
    367 
    368 		default:
    369 			break;
    370 		}
    371 	}
    372 	*rv = 0;
    373 	return 0;
    374 }
    375 
    376 
    377 
    378 /*
    379  * expand tilde from the passwd file.
    380  */
    381 static const Char *
    382 globtilde(const Char *pattern, Char *patbuf, size_t patsize, glob_t *pglob)
    383 {
    384 	struct passwd *pwd;
    385 	const char *h;
    386 	const Char *p;
    387 	Char *b;
    388 	char *d;
    389 	Char *pend = &patbuf[patsize / sizeof(Char)];
    390 #ifndef NO_GETPW_R
    391 	struct passwd pwres;
    392 	char pwbuf[1024];
    393 #endif
    394 
    395 	pend--;
    396 
    397 	_DIAGASSERT(pattern != NULL);
    398 	_DIAGASSERT(patbuf != NULL);
    399 	_DIAGASSERT(pglob != NULL);
    400 
    401 	if (*pattern != TILDE || !(pglob->gl_flags & GLOB_TILDE))
    402 		return pattern;
    403 
    404 	/* Copy up to the end of the string or / */
    405 	for (p = pattern + 1, d = (char *)(void *)patbuf;
    406 	     d < (char *)(void *)pend && *p && *p != SLASH;
    407 	     *d++ = *p++)
    408 		continue;
    409 
    410 	if (d == (char *)(void *)pend)
    411 		return NULL;
    412 
    413 	*d = EOS;
    414 	d = (char *)(void *)patbuf;
    415 
    416 	if (*d == EOS) {
    417 		/*
    418 		 * handle a plain ~ or ~/ by expanding $HOME
    419 		 * first and then trying the password file
    420 		 */
    421 		if ((h = getenv("HOME")) == NULL) {
    422 #ifdef NO_GETPW_R
    423 			if ((pwd = getpwuid(getuid())) == NULL)
    424 #else
    425 			if (getpwuid_r(getuid(), &pwres, pwbuf, sizeof(pwbuf),
    426 			    &pwd) != 0 || pwd == NULL)
    427 #endif
    428 				return pattern;
    429 			else
    430 				h = pwd->pw_dir;
    431 		}
    432 	}
    433 	else {
    434 		/*
    435 		 * Expand a ~user
    436 		 */
    437 #ifdef NO_GETPW_R
    438 		if ((pwd = getpwnam(d)) == NULL)
    439 #else
    440 		if (getpwnam_r(d, &pwres, pwbuf, sizeof(pwbuf), &pwd) != 0 ||
    441 		    pwd == NULL)
    442 #endif
    443 			return pattern;
    444 		else
    445 			h = pwd->pw_dir;
    446 	}
    447 
    448 	/* Copy the home directory */
    449 	for (b = patbuf; b < pend && *h; *b++ = *h++)
    450 		continue;
    451 
    452 	if (b == pend)
    453 		return NULL;
    454 
    455 	/* Append the rest of the pattern */
    456 	while (b < pend && (*b++ = *p++) != EOS)
    457 		continue;
    458 
    459 	if (b == pend)
    460 		return NULL;
    461 
    462 	return patbuf;
    463 }
    464 
    465 
    466 /*
    467  * The main glob() routine: compiles the pattern (optionally processing
    468  * quotes), calls glob1() to do the real pattern matching, and finally
    469  * sorts the list (unless unsorted operation is requested).  Returns 0
    470  * if things went well, nonzero if errors occurred.  It is not an error
    471  * to find no matches.
    472  */
    473 static int
    474 glob0(const Char *pattern, glob_t *pglob, struct glob_limit *limit)
    475 {
    476 	const Char *qpatnext;
    477 	int c, error;
    478 	__gl_size_t oldpathc;
    479 	Char *bufnext, patbuf[MAXPATHLEN+1];
    480 
    481 	_DIAGASSERT(pattern != NULL);
    482 	_DIAGASSERT(pglob != NULL);
    483 
    484 	if ((qpatnext = globtilde(pattern, patbuf, sizeof(patbuf),
    485 	    pglob)) == NULL)
    486 		return GLOB_ABEND;
    487 	oldpathc = pglob->gl_pathc;
    488 	bufnext = patbuf;
    489 
    490 	/* We don't need to check for buffer overflow any more. */
    491 	while ((c = *qpatnext++) != EOS) {
    492 		switch (c) {
    493 		case LBRACKET:
    494 			c = *qpatnext;
    495 			if (c == NOT)
    496 				++qpatnext;
    497 			if (*qpatnext == EOS ||
    498 			    g_strchr(qpatnext+1, RBRACKET) == NULL) {
    499 				*bufnext++ = LBRACKET;
    500 				if (c == NOT)
    501 					--qpatnext;
    502 				break;
    503 			}
    504 			*bufnext++ = M_SET;
    505 			if (c == NOT)
    506 				*bufnext++ = M_NOT;
    507 			c = *qpatnext++;
    508 			do {
    509 				*bufnext++ = CHAR(c);
    510 				if (*qpatnext == RANGE &&
    511 				    (c = qpatnext[1]) != RBRACKET) {
    512 					*bufnext++ = M_RNG;
    513 					*bufnext++ = CHAR(c);
    514 					qpatnext += 2;
    515 				}
    516 			} while ((c = *qpatnext++) != RBRACKET);
    517 			pglob->gl_flags |= GLOB_MAGCHAR;
    518 			*bufnext++ = M_END;
    519 			break;
    520 		case QUESTION:
    521 			pglob->gl_flags |= GLOB_MAGCHAR;
    522 			*bufnext++ = M_ONE;
    523 			break;
    524 		case STAR:
    525 			pglob->gl_flags |= GLOB_MAGCHAR;
    526 			/* collapse adjacent stars to one [or three if globstar]
    527 			 * to avoid exponential behavior
    528 			 */
    529 			if (bufnext == patbuf || bufnext[-1] != M_ALL ||
    530 			    ((pglob->gl_flags & GLOB_STAR) != 0 &&
    531 			    (bufnext - 1 == patbuf || bufnext[-2] != M_ALL ||
    532 			    bufnext - 2 == patbuf || bufnext[-3] != M_ALL)))
    533 				*bufnext++ = M_ALL;
    534 			break;
    535 		default:
    536 			*bufnext++ = CHAR(c);
    537 			break;
    538 		}
    539 	}
    540 	*bufnext = EOS;
    541 #ifdef DEBUG
    542 	qprintf("glob0", patbuf);
    543 #endif
    544 
    545 	if ((error = glob1(patbuf, pglob, limit)) != 0)
    546 		return error;
    547 
    548 	if (pglob->gl_pathc == oldpathc) {
    549 		/*
    550 		 * If there was no match we are going to append the pattern
    551 		 * if GLOB_NOCHECK was specified or if GLOB_NOMAGIC was
    552 		 * specified and the pattern did not contain any magic
    553 		 * characters GLOB_NOMAGIC is there just for compatibility
    554 		 * with csh.
    555 		 */
    556 		if ((pglob->gl_flags & GLOB_NOCHECK) ||
    557 		    ((pglob->gl_flags & (GLOB_NOMAGIC|GLOB_MAGCHAR))
    558 		     == GLOB_NOMAGIC)) {
    559 			return globextend(pattern, pglob, limit);
    560 		} else {
    561 			return GLOB_NOMATCH;
    562 		}
    563 	} else if (!(pglob->gl_flags & GLOB_NOSORT)) {
    564 		qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc,
    565 		    (size_t)pglob->gl_pathc - oldpathc, sizeof(char *),
    566 		    compare);
    567 	}
    568 
    569 	return 0;
    570 }
    571 
    572 static int
    573 compare(const void *p, const void *q)
    574 {
    575 
    576 	_DIAGASSERT(p != NULL);
    577 	_DIAGASSERT(q != NULL);
    578 
    579 	return strcoll(*(const char * const *)p, *(const char * const *)q);
    580 }
    581 
    582 static int
    583 glob1(Char *pattern, glob_t *pglob, struct glob_limit *limit)
    584 {
    585 	Char pathbuf[MAXPATHLEN+1];
    586 
    587 	_DIAGASSERT(pattern != NULL);
    588 	_DIAGASSERT(pglob != NULL);
    589 
    590 	/* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */
    591 	if (*pattern == EOS)
    592 		return 0;
    593 	/*
    594 	 * we save one character so that we can use ptr >= limit,
    595 	 * in the general case when we are appending non nul chars only.
    596 	 */
    597 	return glob2(pathbuf, pathbuf,
    598 	    pathbuf + (sizeof(pathbuf) / sizeof(*pathbuf)) - 1, pattern,
    599 	    pglob, limit);
    600 }
    601 
    602 /*
    603  * The functions glob2 and glob3 are mutually recursive; there is one level
    604  * of recursion for each segment in the pattern that contains one or more
    605  * meta characters.
    606  */
    607 static int
    608 glob2(Char *pathbuf, Char *pathend, Char *pathlim, const Char *pattern,
    609     glob_t *pglob, struct glob_limit *limit)
    610 {
    611 	__gl_stat_t sb;
    612 	const Char *p;
    613 	Char *q;
    614 	int anymeta;
    615 
    616 	_DIAGASSERT(pathbuf != NULL);
    617 	_DIAGASSERT(pathend != NULL);
    618 	_DIAGASSERT(pattern != NULL);
    619 	_DIAGASSERT(pglob != NULL);
    620 
    621 #ifdef DEBUG
    622 	qprintf("glob2", pathbuf);
    623 #endif
    624 	/*
    625 	 * Loop over pattern segments until end of pattern or until
    626 	 * segment with meta character found.
    627 	 */
    628 	for (anymeta = 0;;) {
    629 		if (*pattern == EOS) {		/* End of pattern? */
    630 			*pathend = EOS;
    631 			if (g_lstat(pathbuf, &sb, pglob))
    632 				return 0;
    633 
    634 			if ((pglob->gl_flags & GLOB_LIMIT) &&
    635 			    limit->l_stat++ >= GLOB_LIMIT_STAT) {
    636 				errno = 0;
    637 				*pathend++ = SEP;
    638 				*pathend = EOS;
    639 				return GLOB_NOSPACE;
    640 			}
    641 			if (((pglob->gl_flags & GLOB_MARK) &&
    642 			    pathend[-1] != SEP) && (S_ISDIR(sb.st_mode) ||
    643 			    (S_ISLNK(sb.st_mode) &&
    644 			    (g_stat(pathbuf, &sb, pglob) == 0) &&
    645 			    S_ISDIR(sb.st_mode)))) {
    646 				if (pathend >= pathlim)
    647 					return GLOB_ABORTED;
    648 				*pathend++ = SEP;
    649 				*pathend = EOS;
    650 			}
    651 			++pglob->gl_matchc;
    652 			return globextend(pathbuf, pglob, limit);
    653 		}
    654 
    655 		/* Find end of next segment, copy tentatively to pathend. */
    656 		q = pathend;
    657 		p = pattern;
    658 		while (*p != EOS && *p != SEP) {
    659 			if (ismeta(*p))
    660 				anymeta = 1;
    661 			if (q >= pathlim)
    662 				return GLOB_ABORTED;
    663 			*q++ = *p++;
    664 		}
    665 
    666                 if (!anymeta) {
    667 			pathend = q;
    668 			pattern = p;
    669 			while (*pattern == SEP) {
    670 				if (pathend >= pathlim)
    671 					return GLOB_ABORTED;
    672 				*pathend++ = *pattern++;
    673 			}
    674 		} else			/* Need expansion, recurse. */
    675 			return glob3(pathbuf, pathend, pathlim, pattern, p,
    676 			    pattern, pglob, limit);
    677 	}
    678 	/* NOTREACHED */
    679 }
    680 
    681 static int
    682 glob3(Char *pathbuf, Char *pathend, Char *pathlim, const Char *pattern,
    683     const Char *restpattern, const Char *pglobstar, glob_t *pglob,
    684     struct glob_limit *limit)
    685 {
    686 	struct dirent *dp;
    687 	DIR *dirp;
    688 	__gl_stat_t sbuf;
    689 	int error;
    690 	char buf[MAXPATHLEN];
    691 	int globstar = 0;
    692 	int chase_symlinks = 0;
    693 	const Char *termstar = NULL;
    694 
    695 	/*
    696 	 * The readdirfunc declaration can't be prototyped, because it is
    697 	 * assigned, below, to two functions which are prototyped in glob.h
    698 	 * and dirent.h as taking pointers to differently typed opaque
    699 	 * structures.
    700 	 */
    701 	struct dirent *(*readdirfunc)(void *);
    702 
    703 	_DIAGASSERT(pathbuf != NULL);
    704 	_DIAGASSERT(pathend != NULL);
    705 	_DIAGASSERT(pattern != NULL);
    706 	_DIAGASSERT(restpattern != NULL);
    707 	_DIAGASSERT(pglob != NULL);
    708 
    709 	*pathend = EOS;
    710 	errno = 0;
    711 
    712 	while (pglobstar < restpattern) {
    713 		if ((pglobstar[0] & M_MASK) == M_ALL &&
    714 		    (pglobstar[1] & M_MASK) == M_ALL) {
    715 			globstar = 1;
    716 			chase_symlinks = (pglobstar[2] & M_MASK) == M_ALL;
    717 			termstar = pglobstar + (2 + chase_symlinks);
    718 			break;
    719 		}
    720 		pglobstar++;
    721 	}
    722 
    723 	if (globstar) {
    724 		error = pglobstar == pattern && termstar == restpattern ?
    725 		    *restpattern == EOS ?
    726 		    glob2(pathbuf, pathend, pathlim, restpattern - 1, pglob,
    727 		    limit) :
    728 		    glob2(pathbuf, pathend, pathlim, restpattern + 1, pglob,
    729 		    limit) :
    730 		    glob3(pathbuf, pathend, pathlim, pattern, restpattern,
    731 		    termstar, pglob, limit);
    732 		if (error)
    733 			return error;
    734 		*pathend = EOS;
    735 	}
    736 
    737 	if (*pathbuf && (g_lstat(pathbuf, &sbuf, pglob) ||
    738 	    !S_ISDIR(sbuf.st_mode)
    739 #ifdef S_IFLINK
    740 	     && ((globstar && !chase_symlinks) || !S_ISLNK(sbuf.st_mode))
    741 #endif
    742 	    ))
    743 		return 0;
    744 
    745 	if ((dirp = g_opendir(pathbuf, pglob)) == NULL) {
    746 		if (pglob->gl_errfunc) {
    747 			if (g_Ctoc(pathbuf, buf, sizeof(buf)))
    748 				return GLOB_ABORTED;
    749 			if (pglob->gl_errfunc(buf, errno) ||
    750 			    pglob->gl_flags & GLOB_ERR)
    751 				return GLOB_ABORTED;
    752 		}
    753 		/*
    754 		 * Posix/XOpen: glob should return when it encounters a
    755 		 * directory that it cannot open or read
    756 		 * XXX: Should we ignore ENOTDIR and ENOENT though?
    757 		 * I think that Posix had in mind EPERM...
    758 		 */
    759 		if (pglob->gl_flags & GLOB_ERR)
    760 			return GLOB_ABORTED;
    761 
    762 		return 0;
    763 	}
    764 
    765 	error = 0;
    766 
    767 	/* Search directory for matching names. */
    768 	if (pglob->gl_flags & GLOB_ALTDIRFUNC)
    769 		readdirfunc = pglob->gl_readdir;
    770 	else
    771 		readdirfunc = (struct dirent *(*)(void *)) readdir;
    772 	while ((dp = (*readdirfunc)(dirp)) != NULL) {
    773 		unsigned char *sc;
    774 		Char *dc;
    775 
    776 		if ((pglob->gl_flags & GLOB_LIMIT) &&
    777 		    limit->l_readdir++ >= GLOB_LIMIT_READDIR) {
    778 			errno = 0;
    779 			*pathend++ = SEP;
    780 			*pathend = EOS;
    781 			error = GLOB_NOSPACE;
    782 			break;
    783 		}
    784 
    785 		/*
    786 		 * Initial DOT must be matched literally, unless we have
    787 		 * GLOB_PERIOD set.
    788 		 */
    789 		if ((pglob->gl_flags & GLOB_PERIOD) == 0)
    790 			if (dp->d_name[0] == DOT && *pattern != DOT)
    791 				continue;
    792 		/*
    793 		 * If GLOB_NO_DOTDIRS is set, . and .. vanish.
    794 		 */
    795 		if ((pglob->gl_flags & GLOB_NO_DOTDIRS) &&
    796 		    (dp->d_name[0] == DOT) &&
    797 		    ((dp->d_name[1] == EOS) ||
    798 		     ((dp->d_name[1] == DOT) && (dp->d_name[2] == EOS))))
    799 			continue;
    800 		/*
    801 		 * The resulting string contains EOS, so we can
    802 		 * use the pathlim character, if it is the nul
    803 		 */
    804 		for (sc = (unsigned char *) dp->d_name, dc = pathend;
    805 		     dc <= pathlim && (*dc++ = *sc++) != EOS;)
    806 			continue;
    807 
    808 		/*
    809 		 * Have we filled the buffer without seeing EOS?
    810 		 */
    811 		if (dc > pathlim && *pathlim != EOS) {
    812 			/*
    813 			 * Abort when requested by caller, otherwise
    814 			 * reset pathend back to last SEP and continue
    815 			 * with next dir entry.
    816 			 */
    817 			if (pglob->gl_flags & GLOB_ERR) {
    818 				error = GLOB_ABORTED;
    819 				break;
    820 			}
    821 			else {
    822 				*pathend = EOS;
    823 				continue;
    824 			}
    825 		}
    826 
    827 		if (globstar) {
    828 #ifdef S_IFLNK
    829 			if (!chase_symlinks &&
    830 			    (g_lstat(pathbuf, &sbuf, pglob) ||
    831 			    S_ISLNK(sbuf.st_mode)))
    832 				continue;
    833 #endif
    834 
    835 			if (!match(pathend, pattern, termstar))
    836 				continue;
    837 
    838 			if (--dc < pathlim - 2)
    839 				*dc++ = SEP;
    840 			*dc = EOS;
    841 			error = glob2(pathbuf, dc, pathlim, pglobstar,
    842 			    pglob, limit);
    843 			if (error)
    844 				break;
    845 			*pathend = EOS;
    846 		} else {
    847 			if (!match(pathend, pattern, restpattern)) {
    848 				*pathend = EOS;
    849 				continue;
    850 			}
    851 			error = glob2(pathbuf, --dc, pathlim, restpattern,
    852 			    pglob, limit);
    853 			if (error)
    854 				break;
    855 		}
    856 	}
    857 	if (pglob->gl_flags & GLOB_ALTDIRFUNC)
    858 		(*pglob->gl_closedir)(dirp);
    859 	else
    860 		closedir(dirp);
    861 
    862 	/*
    863 	 * Again Posix X/Open issue with regards to error handling.
    864 	 */
    865 	if ((error || errno) && (pglob->gl_flags & GLOB_ERR))
    866 		return GLOB_ABORTED;
    867 
    868 	return error;
    869 }
    870 
    871 
    872 /*
    873  * Extend the gl_pathv member of a glob_t structure to accommodate a new item,
    874  * add the new item, and update gl_pathc.
    875  *
    876  * This assumes the BSD realloc, which only copies the block when its size
    877  * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
    878  * behavior.
    879  *
    880  * Return 0 if new item added, error code if memory couldn't be allocated.
    881  *
    882  * Invariant of the glob_t structure:
    883  *	Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
    884  *	gl_pathv points to (gl_offs + gl_pathc + 1) items.
    885  */
    886 static int
    887 globextend(const Char *path, glob_t *pglob, struct glob_limit *limit)
    888 {
    889 	char **pathv;
    890 	size_t i, newsize, len;
    891 	char *copy;
    892 	const Char *p;
    893 
    894 	_DIAGASSERT(path != NULL);
    895 	_DIAGASSERT(pglob != NULL);
    896 
    897 	newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs);
    898 	if ((pglob->gl_flags & GLOB_LIMIT) &&
    899 	    newsize > GLOB_LIMIT_PATH * sizeof(*pathv))
    900 		goto nospace;
    901 	pathv = pglob->gl_pathv ? realloc(pglob->gl_pathv, newsize) :
    902 	    malloc(newsize);
    903 	if (pathv == NULL)
    904 		return GLOB_NOSPACE;
    905 
    906 	if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
    907 		/* first time around -- clear initial gl_offs items */
    908 		pathv += pglob->gl_offs;
    909 		for (i = pglob->gl_offs + 1; --i > 0; )
    910 			*--pathv = NULL;
    911 	}
    912 	pglob->gl_pathv = pathv;
    913 
    914 	for (p = path; *p++;)
    915 		continue;
    916 	len = (size_t)(p - path);
    917 	limit->l_string += len;
    918 	if ((copy = malloc(len)) != NULL) {
    919 		if (g_Ctoc(path, copy, len)) {
    920 			free(copy);
    921 			return GLOB_ABORTED;
    922 		}
    923 		pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
    924 	}
    925 	pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
    926 
    927 	if ((pglob->gl_flags & GLOB_LIMIT) &&
    928 	    (newsize + limit->l_string) >= GLOB_LIMIT_STRING)
    929 		goto nospace;
    930 
    931 	return copy == NULL ? GLOB_NOSPACE : 0;
    932 nospace:
    933 	errno = 0;
    934 	return GLOB_NOSPACE;
    935 }
    936 
    937 
    938 /*
    939  * pattern matching function for filenames.  Each occurrence of the *
    940  * pattern causes a recursion level.
    941  */
    942 static int
    943 match(const Char *name, const Char *pat, const Char *patend)
    944 {
    945 	int ok, negate_range;
    946 	Char c, k;
    947 
    948 	_DIAGASSERT(name != NULL);
    949 	_DIAGASSERT(pat != NULL);
    950 	_DIAGASSERT(patend != NULL);
    951 
    952 	while (pat < patend) {
    953 		c = *pat++;
    954 		switch (c & M_MASK) {
    955 		case M_ALL:
    956 			while (pat < patend && (*pat & M_MASK) == M_ALL)
    957 				pat++;	/* eat consecutive '*' */
    958 			if (pat == patend)
    959 				return 1;
    960 			for (; !match(name, pat, patend); name++)
    961 				if (*name == EOS)
    962 					return 0;
    963 			return 1;
    964 		case M_ONE:
    965 			if (*name++ == EOS)
    966 				return 0;
    967 			break;
    968 		case M_SET:
    969 			ok = 0;
    970 			if ((k = *name++) == EOS)
    971 				return 0;
    972 			if ((negate_range = ((*pat & M_MASK) == M_NOT)) != EOS)
    973 				++pat;
    974 			while (((c = *pat++) & M_MASK) != M_END)
    975 				if ((*pat & M_MASK) == M_RNG) {
    976 					if (c <= k && k <= pat[1])
    977 						ok = 1;
    978 					pat += 2;
    979 				} else if (c == k)
    980 					ok = 1;
    981 			if (ok == negate_range)
    982 				return 0;
    983 			break;
    984 		default:
    985 			if (*name++ != c)
    986 				return 0;
    987 			break;
    988 		}
    989 	}
    990 	return *name == EOS;
    991 }
    992 
    993 /* Free allocated data belonging to a glob_t structure. */
    994 void
    995 globfree(glob_t *pglob)
    996 {
    997 	size_t i;
    998 	char **pp;
    999 
   1000 	_DIAGASSERT(pglob != NULL);
   1001 
   1002 	if (pglob->gl_pathv != NULL) {
   1003 		pp = pglob->gl_pathv + pglob->gl_offs;
   1004 		for (i = pglob->gl_pathc; i--; ++pp)
   1005 			if (*pp)
   1006 				free(*pp);
   1007 		free(pglob->gl_pathv);
   1008 		pglob->gl_pathv = NULL;
   1009 		pglob->gl_pathc = 0;
   1010 	}
   1011 }
   1012 
   1013 #ifndef __LIBC12_SOURCE__
   1014 int
   1015 glob_pattern_p(const char *pattern, int quote)
   1016 {
   1017 	int range = 0;
   1018 
   1019 	for (; *pattern; pattern++)
   1020 		switch (*pattern) {
   1021 		case QUESTION:
   1022 		case STAR:
   1023 			return 1;
   1024 
   1025 		case QUOTE:
   1026 			if (quote && pattern[1] != EOS)
   1027 			      ++pattern;
   1028 			break;
   1029 
   1030 		case LBRACKET:
   1031 			range = 1;
   1032 			break;
   1033 
   1034 		case RBRACKET:
   1035 			if (range)
   1036 			      return 1;
   1037 			break;
   1038 		default:
   1039 			break;
   1040 		}
   1041 
   1042 	  return 0;
   1043 }
   1044 #endif
   1045 
   1046 static DIR *
   1047 g_opendir(Char *str, glob_t *pglob)
   1048 {
   1049 	char buf[MAXPATHLEN];
   1050 
   1051 	_DIAGASSERT(str != NULL);
   1052 	_DIAGASSERT(pglob != NULL);
   1053 
   1054 	if (!*str)
   1055 		(void)strlcpy(buf, ".", sizeof(buf));
   1056 	else {
   1057 		if (g_Ctoc(str, buf, sizeof(buf)))
   1058 			return NULL;
   1059 	}
   1060 
   1061 	if (pglob->gl_flags & GLOB_ALTDIRFUNC)
   1062 		return (*pglob->gl_opendir)(buf);
   1063 
   1064 	return opendir(buf);
   1065 }
   1066 
   1067 static int
   1068 g_lstat(Char *fn, __gl_stat_t *sb, glob_t *pglob)
   1069 {
   1070 	char buf[MAXPATHLEN];
   1071 
   1072 	_DIAGASSERT(fn != NULL);
   1073 	_DIAGASSERT(sb != NULL);
   1074 	_DIAGASSERT(pglob != NULL);
   1075 
   1076 	if (g_Ctoc(fn, buf, sizeof(buf)))
   1077 		return -1;
   1078 	if (pglob->gl_flags & GLOB_ALTDIRFUNC)
   1079 		return (*pglob->gl_lstat)(buf, sb);
   1080 	return lstat(buf, sb);
   1081 }
   1082 
   1083 static int
   1084 g_stat(Char *fn, __gl_stat_t *sb, glob_t *pglob)
   1085 {
   1086 	char buf[MAXPATHLEN];
   1087 
   1088 	_DIAGASSERT(fn != NULL);
   1089 	_DIAGASSERT(sb != NULL);
   1090 	_DIAGASSERT(pglob != NULL);
   1091 
   1092 	if (g_Ctoc(fn, buf, sizeof(buf)))
   1093 		return -1;
   1094 	if (pglob->gl_flags & GLOB_ALTDIRFUNC)
   1095 		return (*pglob->gl_stat)(buf, sb);
   1096 	return stat(buf, sb);
   1097 }
   1098 
   1099 static Char *
   1100 g_strchr(const Char *str, int ch)
   1101 {
   1102 
   1103 	_DIAGASSERT(str != NULL);
   1104 
   1105 	do {
   1106 		if (*str == ch)
   1107 			return __UNCONST(str);
   1108 	} while (*str++);
   1109 	return NULL;
   1110 }
   1111 
   1112 static int
   1113 g_Ctoc(const Char *str, char *buf, size_t len)
   1114 {
   1115 	char *dc;
   1116 
   1117 	_DIAGASSERT(str != NULL);
   1118 	_DIAGASSERT(buf != NULL);
   1119 
   1120 	if (len == 0)
   1121 		return 1;
   1122 
   1123 	for (dc = buf; len && (*dc++ = *str++) != EOS; len--)
   1124 		continue;
   1125 
   1126 	return len == 0;
   1127 }
   1128 
   1129 #ifdef DEBUG
   1130 static void
   1131 qprintf(const char *str, Char *s)
   1132 {
   1133 	Char *p;
   1134 
   1135 	_DIAGASSERT(str != NULL);
   1136 	_DIAGASSERT(s != NULL);
   1137 
   1138 	(void)printf("%s:\n", str);
   1139 	for (p = s; *p; p++)
   1140 		(void)printf("%c", CHAR(*p));
   1141 	(void)printf("\n");
   1142 	for (p = s; *p; p++)
   1143 		(void)printf("%c", *p & M_PROTECT ? '"' : ' ');
   1144 	(void)printf("\n");
   1145 	for (p = s; *p; p++)
   1146 		(void)printf("%c", ismeta(*p) ? '_' : ' ');
   1147 	(void)printf("\n");
   1148 }
   1149 #endif
   1150