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      1 /*	$OpenBSD: glob.c,v 1.35 2011/01/12 01:53:14 djm Exp $ */
      2 /*
      3  * Copyright (c) 1989, 1993
      4  *	The Regents of the University of California.  All rights reserved.
      5  *
      6  * This code is derived from software contributed to Berkeley by
      7  * Guido van Rossum.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 /* OPENBSD ORIGINAL: lib/libc/gen/glob.c */
     35 
     36 /*
     37  * glob(3) -- a superset of the one defined in POSIX 1003.2.
     38  *
     39  * The [!...] convention to negate a range is supported (SysV, Posix, ksh).
     40  *
     41  * Optional extra services, controlled by flags not defined by POSIX:
     42  *
     43  * GLOB_QUOTE:
     44  *	Escaping convention: \ inhibits any special meaning the following
     45  *	character might have (except \ at end of string is retained).
     46  * GLOB_MAGCHAR:
     47  *	Set in gl_flags if pattern contained a globbing character.
     48  * GLOB_NOMAGIC:
     49  *	Same as GLOB_NOCHECK, but it will only append pattern if it did
     50  *	not contain any magic characters.  [Used in csh style globbing]
     51  * GLOB_ALTDIRFUNC:
     52  *	Use alternately specified directory access functions.
     53  * GLOB_TILDE:
     54  *	expand ~user/foo to the /home/dir/of/user/foo
     55  * GLOB_BRACE:
     56  *	expand {1,2}{a,b} to 1a 1b 2a 2b
     57  * gl_matchc:
     58  *	Number of matches in the current invocation of glob.
     59  */
     60 
     61 #include "includes.h"
     62 
     63 #include <sys/types.h>
     64 #include <sys/stat.h>
     65 
     66 #include <dirent.h>
     67 #include <ctype.h>
     68 #include <errno.h>
     69 #include <pwd.h>
     70 #include <stdlib.h>
     71 #include <string.h>
     72 #include <unistd.h>
     73 
     74 #if !defined(HAVE_GLOB) || !defined(GLOB_HAS_ALTDIRFUNC) || \
     75     !defined(GLOB_HAS_GL_MATCHC) || !defined(GLOB_HAS_GL_STATV) || \
     76     !defined(HAVE_DECL_GLOB_NOMATCH) || HAVE_DECL_GLOB_NOMATCH == 0 || \
     77     defined(BROKEN_GLOB)
     78 
     79 #include "charclass.h"
     80 
     81 #define	DOLLAR		'$'
     82 #define	DOT		'.'
     83 #define	EOS		'\0'
     84 #define	LBRACKET	'['
     85 #define	NOT		'!'
     86 #define	QUESTION	'?'
     87 #define	QUOTE		'\\'
     88 #define	RANGE		'-'
     89 #define	RBRACKET	']'
     90 #define	SEP		'/'
     91 #define	STAR		'*'
     92 #define	TILDE		'~'
     93 #define	UNDERSCORE	'_'
     94 #define	LBRACE		'{'
     95 #define	RBRACE		'}'
     96 #define	SLASH		'/'
     97 #define	COMMA		','
     98 
     99 #ifndef DEBUG
    100 
    101 #define	M_QUOTE		0x8000
    102 #define	M_PROTECT	0x4000
    103 #define	M_MASK		0xffff
    104 #define	M_ASCII		0x00ff
    105 
    106 typedef u_short Char;
    107 
    108 #else
    109 
    110 #define	M_QUOTE		0x80
    111 #define	M_PROTECT	0x40
    112 #define	M_MASK		0xff
    113 #define	M_ASCII		0x7f
    114 
    115 typedef char Char;
    116 
    117 #endif
    118 
    119 
    120 #define	CHAR(c)		((Char)((c)&M_ASCII))
    121 #define	META(c)		((Char)((c)|M_QUOTE))
    122 #define	M_ALL		META('*')
    123 #define	M_END		META(']')
    124 #define	M_NOT		META('!')
    125 #define	M_ONE		META('?')
    126 #define	M_RNG		META('-')
    127 #define	M_SET		META('[')
    128 #define	M_CLASS		META(':')
    129 #define	ismeta(c)	(((c)&M_QUOTE) != 0)
    130 
    131 #define	GLOB_LIMIT_MALLOC	65536
    132 #define	GLOB_LIMIT_STAT		128
    133 #define	GLOB_LIMIT_READDIR	16384
    134 
    135 struct glob_lim {
    136 	size_t	glim_malloc;
    137 	size_t	glim_stat;
    138 	size_t	glim_readdir;
    139 };
    140 
    141 static int	 compare(const void *, const void *);
    142 static int	 g_Ctoc(const Char *, char *, u_int);
    143 static int	 g_lstat(Char *, struct stat *, glob_t *);
    144 static DIR	*g_opendir(Char *, glob_t *);
    145 static Char	*g_strchr(const Char *, int);
    146 static int	 g_strncmp(const Char *, const char *, size_t);
    147 static int	 g_stat(Char *, struct stat *, glob_t *);
    148 static int	 glob0(const Char *, glob_t *, struct glob_lim *);
    149 static int	 glob1(Char *, Char *, glob_t *, struct glob_lim *);
    150 static int	 glob2(Char *, Char *, Char *, Char *, Char *, Char *,
    151 		    glob_t *, struct glob_lim *);
    152 static int	 glob3(Char *, Char *, Char *, Char *, Char *,
    153 		    Char *, Char *, glob_t *, struct glob_lim *);
    154 static int	 globextend(const Char *, glob_t *, struct glob_lim *,
    155 		    struct stat *);
    156 static const Char *
    157 		 globtilde(const Char *, Char *, size_t, glob_t *);
    158 static int	 globexp1(const Char *, glob_t *, struct glob_lim *);
    159 static int	 globexp2(const Char *, const Char *, glob_t *,
    160 		    struct glob_lim *);
    161 static int	 match(Char *, Char *, Char *);
    162 #ifdef DEBUG
    163 static void	 qprintf(const char *, Char *);
    164 #endif
    165 
    166 int
    167 glob(const char *pattern, int flags, int (*errfunc)(const char *, int),
    168     glob_t *pglob)
    169 {
    170 	const u_char *patnext;
    171 	int c;
    172 	Char *bufnext, *bufend, patbuf[MAXPATHLEN];
    173 	struct glob_lim limit = { 0, 0, 0 };
    174 
    175 	patnext = (u_char *) pattern;
    176 	if (!(flags & GLOB_APPEND)) {
    177 		pglob->gl_pathc = 0;
    178 		pglob->gl_pathv = NULL;
    179 		pglob->gl_statv = NULL;
    180 		if (!(flags & GLOB_DOOFFS))
    181 			pglob->gl_offs = 0;
    182 	}
    183 	pglob->gl_flags = flags & ~GLOB_MAGCHAR;
    184 	pglob->gl_errfunc = errfunc;
    185 	pglob->gl_matchc = 0;
    186 
    187 	if (pglob->gl_offs < 0 || pglob->gl_pathc < 0 ||
    188 	    pglob->gl_offs >= INT_MAX || pglob->gl_pathc >= INT_MAX ||
    189 	    pglob->gl_pathc >= INT_MAX - pglob->gl_offs - 1)
    190 		return GLOB_NOSPACE;
    191 
    192 	bufnext = patbuf;
    193 	bufend = bufnext + MAXPATHLEN - 1;
    194 	if (flags & GLOB_NOESCAPE)
    195 		while (bufnext < bufend && (c = *patnext++) != EOS)
    196 			*bufnext++ = c;
    197 	else {
    198 		/* Protect the quoted characters. */
    199 		while (bufnext < bufend && (c = *patnext++) != EOS)
    200 			if (c == QUOTE) {
    201 				if ((c = *patnext++) == EOS) {
    202 					c = QUOTE;
    203 					--patnext;
    204 				}
    205 				*bufnext++ = c | M_PROTECT;
    206 			} else
    207 				*bufnext++ = c;
    208 	}
    209 	*bufnext = EOS;
    210 
    211 	if (flags & GLOB_BRACE)
    212 		return globexp1(patbuf, pglob, &limit);
    213 	else
    214 		return glob0(patbuf, pglob, &limit);
    215 }
    216 
    217 /*
    218  * Expand recursively a glob {} pattern. When there is no more expansion
    219  * invoke the standard globbing routine to glob the rest of the magic
    220  * characters
    221  */
    222 static int
    223 globexp1(const Char *pattern, glob_t *pglob, struct glob_lim *limitp)
    224 {
    225 	const Char* ptr = pattern;
    226 
    227 	/* Protect a single {}, for find(1), like csh */
    228 	if (pattern[0] == LBRACE && pattern[1] == RBRACE && pattern[2] == EOS)
    229 		return glob0(pattern, pglob, limitp);
    230 
    231 	if ((ptr = (const Char *) g_strchr(ptr, LBRACE)) != NULL)
    232 		return globexp2(ptr, pattern, pglob, limitp);
    233 
    234 	return glob0(pattern, pglob, limitp);
    235 }
    236 
    237 
    238 /*
    239  * Recursive brace globbing helper. Tries to expand a single brace.
    240  * If it succeeds then it invokes globexp1 with the new pattern.
    241  * If it fails then it tries to glob the rest of the pattern and returns.
    242  */
    243 static int
    244 globexp2(const Char *ptr, const Char *pattern, glob_t *pglob,
    245     struct glob_lim *limitp)
    246 {
    247 	int     i, rv;
    248 	Char   *lm, *ls;
    249 	const Char *pe, *pm, *pl;
    250 	Char    patbuf[MAXPATHLEN];
    251 
    252 	/* copy part up to the brace */
    253 	for (lm = patbuf, pm = pattern; pm != ptr; *lm++ = *pm++)
    254 		;
    255 	*lm = EOS;
    256 	ls = lm;
    257 
    258 	/* Find the balanced brace */
    259 	for (i = 0, pe = ++ptr; *pe; pe++)
    260 		if (*pe == LBRACKET) {
    261 			/* Ignore everything between [] */
    262 			for (pm = pe++; *pe != RBRACKET && *pe != EOS; pe++)
    263 				;
    264 			if (*pe == EOS) {
    265 				/*
    266 				 * We could not find a matching RBRACKET.
    267 				 * Ignore and just look for RBRACE
    268 				 */
    269 				pe = pm;
    270 			}
    271 		} else if (*pe == LBRACE)
    272 			i++;
    273 		else if (*pe == RBRACE) {
    274 			if (i == 0)
    275 				break;
    276 			i--;
    277 		}
    278 
    279 	/* Non matching braces; just glob the pattern */
    280 	if (i != 0 || *pe == EOS)
    281 		return glob0(patbuf, pglob, limitp);
    282 
    283 	for (i = 0, pl = pm = ptr; pm <= pe; pm++) {
    284 		switch (*pm) {
    285 		case LBRACKET:
    286 			/* Ignore everything between [] */
    287 			for (pl = pm++; *pm != RBRACKET && *pm != EOS; pm++)
    288 				;
    289 			if (*pm == EOS) {
    290 				/*
    291 				 * We could not find a matching RBRACKET.
    292 				 * Ignore and just look for RBRACE
    293 				 */
    294 				pm = pl;
    295 			}
    296 			break;
    297 
    298 		case LBRACE:
    299 			i++;
    300 			break;
    301 
    302 		case RBRACE:
    303 			if (i) {
    304 				i--;
    305 				break;
    306 			}
    307 			/* FALLTHROUGH */
    308 		case COMMA:
    309 			if (i && *pm == COMMA)
    310 				break;
    311 			else {
    312 				/* Append the current string */
    313 				for (lm = ls; (pl < pm); *lm++ = *pl++)
    314 					;
    315 
    316 				/*
    317 				 * Append the rest of the pattern after the
    318 				 * closing brace
    319 				 */
    320 				for (pl = pe + 1; (*lm++ = *pl++) != EOS; )
    321 					;
    322 
    323 				/* Expand the current pattern */
    324 #ifdef DEBUG
    325 				qprintf("globexp2:", patbuf);
    326 #endif
    327 				rv = globexp1(patbuf, pglob, limitp);
    328 				if (rv && rv != GLOB_NOMATCH)
    329 					return rv;
    330 
    331 				/* move after the comma, to the next string */
    332 				pl = pm + 1;
    333 			}
    334 			break;
    335 
    336 		default:
    337 			break;
    338 		}
    339 	}
    340 	return 0;
    341 }
    342 
    343 
    344 
    345 /*
    346  * expand tilde from the passwd file.
    347  */
    348 static const Char *
    349 globtilde(const Char *pattern, Char *patbuf, size_t patbuf_len, glob_t *pglob)
    350 {
    351 	struct passwd *pwd;
    352 	char *h;
    353 	const Char *p;
    354 	Char *b, *eb;
    355 
    356 	if (*pattern != TILDE || !(pglob->gl_flags & GLOB_TILDE))
    357 		return pattern;
    358 
    359 	/* Copy up to the end of the string or / */
    360 	eb = &patbuf[patbuf_len - 1];
    361 	for (p = pattern + 1, h = (char *) patbuf;
    362 	    h < (char *)eb && *p && *p != SLASH; *h++ = *p++)
    363 		;
    364 
    365 	*h = EOS;
    366 
    367 #if 0
    368 	if (h == (char *)eb)
    369 		return what;
    370 #endif
    371 
    372 	if (((char *) patbuf)[0] == EOS) {
    373 		/*
    374 		 * handle a plain ~ or ~/ by expanding $HOME
    375 		 * first and then trying the password file
    376 		 */
    377 #if 0
    378 		if (issetugid() != 0 || (h = getenv("HOME")) == NULL) {
    379 #endif
    380 		if ((getuid() != geteuid()) || (h = getenv("HOME")) == NULL) {
    381 			if ((pwd = getpwuid(getuid())) == NULL)
    382 				return pattern;
    383 			else
    384 				h = pwd->pw_dir;
    385 		}
    386 	} else {
    387 		/*
    388 		 * Expand a ~user
    389 		 */
    390 		if ((pwd = getpwnam((char*) patbuf)) == NULL)
    391 			return pattern;
    392 		else
    393 			h = pwd->pw_dir;
    394 	}
    395 
    396 	/* Copy the home directory */
    397 	for (b = patbuf; b < eb && *h; *b++ = *h++)
    398 		;
    399 
    400 	/* Append the rest of the pattern */
    401 	while (b < eb && (*b++ = *p++) != EOS)
    402 		;
    403 	*b = EOS;
    404 
    405 	return patbuf;
    406 }
    407 
    408 static int
    409 g_strncmp(const Char *s1, const char *s2, size_t n)
    410 {
    411 	int rv = 0;
    412 
    413 	while (n--) {
    414 		rv = *(Char *)s1 - *(const unsigned char *)s2++;
    415 		if (rv)
    416 			break;
    417 		if (*s1++ == '\0')
    418 			break;
    419 	}
    420 	return rv;
    421 }
    422 
    423 static int
    424 g_charclass(const Char **patternp, Char **bufnextp)
    425 {
    426 	const Char *pattern = *patternp + 1;
    427 	Char *bufnext = *bufnextp;
    428 	const Char *colon;
    429 	struct cclass *cc;
    430 	size_t len;
    431 
    432 	if ((colon = g_strchr(pattern, ':')) == NULL || colon[1] != ']')
    433 		return 1;	/* not a character class */
    434 
    435 	len = (size_t)(colon - pattern);
    436 	for (cc = cclasses; cc->name != NULL; cc++) {
    437 		if (!g_strncmp(pattern, cc->name, len) && cc->name[len] == '\0')
    438 			break;
    439 	}
    440 	if (cc->name == NULL)
    441 		return -1;	/* invalid character class */
    442 	*bufnext++ = M_CLASS;
    443 	*bufnext++ = (Char)(cc - &cclasses[0]);
    444 	*bufnextp = bufnext;
    445 	*patternp += len + 3;
    446 
    447 	return 0;
    448 }
    449 
    450 /*
    451  * The main glob() routine: compiles the pattern (optionally processing
    452  * quotes), calls glob1() to do the real pattern matching, and finally
    453  * sorts the list (unless unsorted operation is requested).  Returns 0
    454  * if things went well, nonzero if errors occurred.  It is not an error
    455  * to find no matches.
    456  */
    457 static int
    458 glob0(const Char *pattern, glob_t *pglob, struct glob_lim *limitp)
    459 {
    460 	const Char *qpatnext;
    461 	int c, err, oldpathc;
    462 	Char *bufnext, patbuf[MAXPATHLEN];
    463 
    464 	qpatnext = globtilde(pattern, patbuf, MAXPATHLEN, pglob);
    465 	oldpathc = pglob->gl_pathc;
    466 	bufnext = patbuf;
    467 
    468 	/* We don't need to check for buffer overflow any more. */
    469 	while ((c = *qpatnext++) != EOS) {
    470 		switch (c) {
    471 		case LBRACKET:
    472 			c = *qpatnext;
    473 			if (c == NOT)
    474 				++qpatnext;
    475 			if (*qpatnext == EOS ||
    476 			    g_strchr(qpatnext+1, RBRACKET) == NULL) {
    477 				*bufnext++ = LBRACKET;
    478 				if (c == NOT)
    479 					--qpatnext;
    480 				break;
    481 			}
    482 			*bufnext++ = M_SET;
    483 			if (c == NOT)
    484 				*bufnext++ = M_NOT;
    485 			c = *qpatnext++;
    486 			do {
    487 				if (c == LBRACKET && *qpatnext == ':') {
    488 					do {
    489 						err = g_charclass(&qpatnext,
    490 						    &bufnext);
    491 						if (err)
    492 							break;
    493 						c = *qpatnext++;
    494 					} while (c == LBRACKET && *qpatnext == ':');
    495 					if (err == -1 &&
    496 					    !(pglob->gl_flags & GLOB_NOCHECK))
    497 						return GLOB_NOMATCH;
    498 					if (c == RBRACKET)
    499 						break;
    500 				}
    501 				*bufnext++ = CHAR(c);
    502 				if (*qpatnext == RANGE &&
    503 				    (c = qpatnext[1]) != RBRACKET) {
    504 					*bufnext++ = M_RNG;
    505 					*bufnext++ = CHAR(c);
    506 					qpatnext += 2;
    507 				}
    508 			} while ((c = *qpatnext++) != RBRACKET);
    509 			pglob->gl_flags |= GLOB_MAGCHAR;
    510 			*bufnext++ = M_END;
    511 			break;
    512 		case QUESTION:
    513 			pglob->gl_flags |= GLOB_MAGCHAR;
    514 			*bufnext++ = M_ONE;
    515 			break;
    516 		case STAR:
    517 			pglob->gl_flags |= GLOB_MAGCHAR;
    518 			/* collapse adjacent stars to one,
    519 			 * to avoid exponential behavior
    520 			 */
    521 			if (bufnext == patbuf || bufnext[-1] != M_ALL)
    522 				*bufnext++ = M_ALL;
    523 			break;
    524 		default:
    525 			*bufnext++ = CHAR(c);
    526 			break;
    527 		}
    528 	}
    529 	*bufnext = EOS;
    530 #ifdef DEBUG
    531 	qprintf("glob0:", patbuf);
    532 #endif
    533 
    534 	if ((err = glob1(patbuf, patbuf+MAXPATHLEN-1, pglob, limitp)) != 0)
    535 		return(err);
    536 
    537 	/*
    538 	 * If there was no match we are going to append the pattern
    539 	 * if GLOB_NOCHECK was specified or if GLOB_NOMAGIC was specified
    540 	 * and the pattern did not contain any magic characters
    541 	 * GLOB_NOMAGIC is there just for compatibility with csh.
    542 	 */
    543 	if (pglob->gl_pathc == oldpathc) {
    544 		if ((pglob->gl_flags & GLOB_NOCHECK) ||
    545 		    ((pglob->gl_flags & GLOB_NOMAGIC) &&
    546 		    !(pglob->gl_flags & GLOB_MAGCHAR)))
    547 			return(globextend(pattern, pglob, limitp, NULL));
    548 		else
    549 			return(GLOB_NOMATCH);
    550 	}
    551 	if (!(pglob->gl_flags & GLOB_NOSORT))
    552 		qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc,
    553 		    pglob->gl_pathc - oldpathc, sizeof(char *), compare);
    554 	return(0);
    555 }
    556 
    557 static int
    558 compare(const void *p, const void *q)
    559 {
    560 	return(strcmp(*(char **)p, *(char **)q));
    561 }
    562 
    563 static int
    564 glob1(Char *pattern, Char *pattern_last, glob_t *pglob, struct glob_lim *limitp)
    565 {
    566 	Char pathbuf[MAXPATHLEN];
    567 
    568 	/* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */
    569 	if (*pattern == EOS)
    570 		return(0);
    571 	return(glob2(pathbuf, pathbuf+MAXPATHLEN-1,
    572 	    pathbuf, pathbuf+MAXPATHLEN-1,
    573 	    pattern, pattern_last, pglob, limitp));
    574 }
    575 
    576 /*
    577  * The functions glob2 and glob3 are mutually recursive; there is one level
    578  * of recursion for each segment in the pattern that contains one or more
    579  * meta characters.
    580  */
    581 static int
    582 glob2(Char *pathbuf, Char *pathbuf_last, Char *pathend, Char *pathend_last,
    583     Char *pattern, Char *pattern_last, glob_t *pglob, struct glob_lim *limitp)
    584 {
    585 	struct stat sb;
    586 	Char *p, *q;
    587 	int anymeta;
    588 
    589 	/*
    590 	 * Loop over pattern segments until end of pattern or until
    591 	 * segment with meta character found.
    592 	 */
    593 	for (anymeta = 0;;) {
    594 		if (*pattern == EOS) {		/* End of pattern? */
    595 			*pathend = EOS;
    596 			if (g_lstat(pathbuf, &sb, pglob))
    597 				return(0);
    598 
    599 			if ((pglob->gl_flags & GLOB_LIMIT) &&
    600 			    limitp->glim_stat++ >= GLOB_LIMIT_STAT) {
    601 				errno = 0;
    602 				*pathend++ = SEP;
    603 				*pathend = EOS;
    604 				return(GLOB_NOSPACE);
    605 			}
    606 
    607 			if (((pglob->gl_flags & GLOB_MARK) &&
    608 			    pathend[-1] != SEP) && (S_ISDIR(sb.st_mode) ||
    609 			    (S_ISLNK(sb.st_mode) &&
    610 			    (g_stat(pathbuf, &sb, pglob) == 0) &&
    611 			    S_ISDIR(sb.st_mode)))) {
    612 				if (pathend+1 > pathend_last)
    613 					return (1);
    614 				*pathend++ = SEP;
    615 				*pathend = EOS;
    616 			}
    617 			++pglob->gl_matchc;
    618 			return(globextend(pathbuf, pglob, limitp, &sb));
    619 		}
    620 
    621 		/* Find end of next segment, copy tentatively to pathend. */
    622 		q = pathend;
    623 		p = pattern;
    624 		while (*p != EOS && *p != SEP) {
    625 			if (ismeta(*p))
    626 				anymeta = 1;
    627 			if (q+1 > pathend_last)
    628 				return (1);
    629 			*q++ = *p++;
    630 		}
    631 
    632 		if (!anymeta) {		/* No expansion, do next segment. */
    633 			pathend = q;
    634 			pattern = p;
    635 			while (*pattern == SEP) {
    636 				if (pathend+1 > pathend_last)
    637 					return (1);
    638 				*pathend++ = *pattern++;
    639 			}
    640 		} else
    641 			/* Need expansion, recurse. */
    642 			return(glob3(pathbuf, pathbuf_last, pathend,
    643 			    pathend_last, pattern, p, pattern_last,
    644 			    pglob, limitp));
    645 	}
    646 	/* NOTREACHED */
    647 }
    648 
    649 static int
    650 glob3(Char *pathbuf, Char *pathbuf_last, Char *pathend, Char *pathend_last,
    651     Char *pattern, Char *restpattern, Char *restpattern_last, glob_t *pglob,
    652     struct glob_lim *limitp)
    653 {
    654 	struct dirent *dp;
    655 	DIR *dirp;
    656 	int err;
    657 	char buf[MAXPATHLEN];
    658 
    659 	/*
    660 	 * The readdirfunc declaration can't be prototyped, because it is
    661 	 * assigned, below, to two functions which are prototyped in glob.h
    662 	 * and dirent.h as taking pointers to differently typed opaque
    663 	 * structures.
    664 	 */
    665 	struct dirent *(*readdirfunc)(void *);
    666 
    667 	if (pathend > pathend_last)
    668 		return (1);
    669 	*pathend = EOS;
    670 	errno = 0;
    671 
    672 	if ((dirp = g_opendir(pathbuf, pglob)) == NULL) {
    673 		/* TODO: don't call for ENOENT or ENOTDIR? */
    674 		if (pglob->gl_errfunc) {
    675 			if (g_Ctoc(pathbuf, buf, sizeof(buf)))
    676 				return(GLOB_ABORTED);
    677 			if (pglob->gl_errfunc(buf, errno) ||
    678 			    pglob->gl_flags & GLOB_ERR)
    679 				return(GLOB_ABORTED);
    680 		}
    681 		return(0);
    682 	}
    683 
    684 	err = 0;
    685 
    686 	/* Search directory for matching names. */
    687 	if (pglob->gl_flags & GLOB_ALTDIRFUNC)
    688 		readdirfunc = pglob->gl_readdir;
    689 	else
    690 		readdirfunc = (struct dirent *(*)(void *))readdir;
    691 	while ((dp = (*readdirfunc)(dirp))) {
    692 		u_char *sc;
    693 		Char *dc;
    694 
    695 		if ((pglob->gl_flags & GLOB_LIMIT) &&
    696 		    limitp->glim_readdir++ >= GLOB_LIMIT_READDIR) {
    697 			errno = 0;
    698 			*pathend++ = SEP;
    699 			*pathend = EOS;
    700 			return(GLOB_NOSPACE);
    701 		}
    702 
    703 		/* Initial DOT must be matched literally. */
    704 		if (dp->d_name[0] == DOT && *pattern != DOT)
    705 			continue;
    706 		dc = pathend;
    707 		sc = (u_char *) dp->d_name;
    708 		while (dc < pathend_last && (*dc++ = *sc++) != EOS)
    709 			;
    710 		if (dc >= pathend_last) {
    711 			*dc = EOS;
    712 			err = 1;
    713 			break;
    714 		}
    715 
    716 		if (!match(pathend, pattern, restpattern)) {
    717 			*pathend = EOS;
    718 			continue;
    719 		}
    720 		err = glob2(pathbuf, pathbuf_last, --dc, pathend_last,
    721 		    restpattern, restpattern_last, pglob, limitp);
    722 		if (err)
    723 			break;
    724 	}
    725 
    726 	if (pglob->gl_flags & GLOB_ALTDIRFUNC)
    727 		(*pglob->gl_closedir)(dirp);
    728 	else
    729 		closedir(dirp);
    730 	return(err);
    731 }
    732 
    733 
    734 /*
    735  * Extend the gl_pathv member of a glob_t structure to accommodate a new item,
    736  * add the new item, and update gl_pathc.
    737  *
    738  * This assumes the BSD realloc, which only copies the block when its size
    739  * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
    740  * behavior.
    741  *
    742  * Return 0 if new item added, error code if memory couldn't be allocated.
    743  *
    744  * Invariant of the glob_t structure:
    745  *	Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
    746  *	gl_pathv points to (gl_offs + gl_pathc + 1) items.
    747  */
    748 static int
    749 globextend(const Char *path, glob_t *pglob, struct glob_lim *limitp,
    750     struct stat *sb)
    751 {
    752 	char **pathv;
    753 	ssize_t i;
    754 	size_t newn, len;
    755 	char *copy = NULL;
    756 	const Char *p;
    757 	struct stat **statv;
    758 
    759 	newn = 2 + pglob->gl_pathc + pglob->gl_offs;
    760 	if (pglob->gl_offs >= INT_MAX ||
    761 	    pglob->gl_pathc >= INT_MAX ||
    762 	    newn >= INT_MAX ||
    763 	    SIZE_MAX / sizeof(*pathv) <= newn ||
    764 	    SIZE_MAX / sizeof(*statv) <= newn) {
    765  nospace:
    766 		for (i = pglob->gl_offs; i < (ssize_t)(newn - 2); i++) {
    767 			if (pglob->gl_pathv && pglob->gl_pathv[i])
    768 				free(pglob->gl_pathv[i]);
    769 			if ((pglob->gl_flags & GLOB_KEEPSTAT) != 0 &&
    770 			    pglob->gl_pathv && pglob->gl_pathv[i])
    771 				free(pglob->gl_statv[i]);
    772 		}
    773 		if (pglob->gl_pathv) {
    774 			free(pglob->gl_pathv);
    775 			pglob->gl_pathv = NULL;
    776 		}
    777 		if (pglob->gl_statv) {
    778 			free(pglob->gl_statv);
    779 			pglob->gl_statv = NULL;
    780 		}
    781 		return(GLOB_NOSPACE);
    782 	}
    783 
    784 	pathv = realloc(pglob->gl_pathv, newn * sizeof(*pathv));
    785 	if (pathv == NULL)
    786 		goto nospace;
    787 	if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
    788 		/* first time around -- clear initial gl_offs items */
    789 		pathv += pglob->gl_offs;
    790 		for (i = pglob->gl_offs; --i >= 0; )
    791 			*--pathv = NULL;
    792 	}
    793 	pglob->gl_pathv = pathv;
    794 
    795 	if ((pglob->gl_flags & GLOB_KEEPSTAT) != 0) {
    796 		statv = realloc(pglob->gl_statv, newn * sizeof(*statv));
    797 		if (statv == NULL)
    798 			goto nospace;
    799 		if (pglob->gl_statv == NULL && pglob->gl_offs > 0) {
    800 			/* first time around -- clear initial gl_offs items */
    801 			statv += pglob->gl_offs;
    802 			for (i = pglob->gl_offs; --i >= 0; )
    803 				*--statv = NULL;
    804 		}
    805 		pglob->gl_statv = statv;
    806 		if (sb == NULL)
    807 			statv[pglob->gl_offs + pglob->gl_pathc] = NULL;
    808 		else {
    809 			limitp->glim_malloc += sizeof(**statv);
    810 			if ((pglob->gl_flags & GLOB_LIMIT) &&
    811 			    limitp->glim_malloc >= GLOB_LIMIT_MALLOC) {
    812 				errno = 0;
    813 				return(GLOB_NOSPACE);
    814 			}
    815 			if ((statv[pglob->gl_offs + pglob->gl_pathc] =
    816 			    malloc(sizeof(**statv))) == NULL)
    817 				goto copy_error;
    818 			memcpy(statv[pglob->gl_offs + pglob->gl_pathc], sb,
    819 			    sizeof(*sb));
    820 		}
    821 		statv[pglob->gl_offs + pglob->gl_pathc + 1] = NULL;
    822 	}
    823 
    824 	for (p = path; *p++;)
    825 		;
    826 	len = (size_t)(p - path);
    827 	limitp->glim_malloc += len;
    828 	if ((copy = malloc(len)) != NULL) {
    829 		if (g_Ctoc(path, copy, len)) {
    830 			free(copy);
    831 			return(GLOB_NOSPACE);
    832 		}
    833 		pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
    834 	}
    835 	pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
    836 
    837 	if ((pglob->gl_flags & GLOB_LIMIT) &&
    838 	    (newn * sizeof(*pathv)) + limitp->glim_malloc >
    839 	    GLOB_LIMIT_MALLOC) {
    840 		errno = 0;
    841 		return(GLOB_NOSPACE);
    842 	}
    843  copy_error:
    844 	return(copy == NULL ? GLOB_NOSPACE : 0);
    845 }
    846 
    847 
    848 /*
    849  * pattern matching function for filenames.  Each occurrence of the *
    850  * pattern causes a recursion level.
    851  */
    852 static int
    853 match(Char *name, Char *pat, Char *patend)
    854 {
    855 	int ok, negate_range;
    856 	Char c, k;
    857 
    858 	while (pat < patend) {
    859 		c = *pat++;
    860 		switch (c & M_MASK) {
    861 		case M_ALL:
    862 			if (pat == patend)
    863 				return(1);
    864 			do {
    865 			    if (match(name, pat, patend))
    866 				    return(1);
    867 			} while (*name++ != EOS);
    868 			return(0);
    869 		case M_ONE:
    870 			if (*name++ == EOS)
    871 				return(0);
    872 			break;
    873 		case M_SET:
    874 			ok = 0;
    875 			if ((k = *name++) == EOS)
    876 				return(0);
    877 			if ((negate_range = ((*pat & M_MASK) == M_NOT)) != EOS)
    878 				++pat;
    879 			while (((c = *pat++) & M_MASK) != M_END) {
    880 				if ((c & M_MASK) == M_CLASS) {
    881 					Char idx = *pat & M_MASK;
    882 					if (idx < NCCLASSES &&
    883 					    cclasses[idx].isctype(k))
    884 						ok = 1;
    885 					++pat;
    886 				}
    887 				if ((*pat & M_MASK) == M_RNG) {
    888 					if (c <= k && k <= pat[1])
    889 						ok = 1;
    890 					pat += 2;
    891 				} else if (c == k)
    892 					ok = 1;
    893 			}
    894 			if (ok == negate_range)
    895 				return(0);
    896 			break;
    897 		default:
    898 			if (*name++ != c)
    899 				return(0);
    900 			break;
    901 		}
    902 	}
    903 	return(*name == EOS);
    904 }
    905 
    906 /* Free allocated data belonging to a glob_t structure. */
    907 void
    908 globfree(glob_t *pglob)
    909 {
    910 	int i;
    911 	char **pp;
    912 
    913 	if (pglob->gl_pathv != NULL) {
    914 		pp = pglob->gl_pathv + pglob->gl_offs;
    915 		for (i = pglob->gl_pathc; i--; ++pp)
    916 			if (*pp)
    917 				free(*pp);
    918 		free(pglob->gl_pathv);
    919 		pglob->gl_pathv = NULL;
    920 	}
    921 	if (pglob->gl_statv != NULL) {
    922 		for (i = 0; i < pglob->gl_pathc; i++) {
    923 			if (pglob->gl_statv[i] != NULL)
    924 				free(pglob->gl_statv[i]);
    925 		}
    926 		free(pglob->gl_statv);
    927 		pglob->gl_statv = NULL;
    928 	}
    929 }
    930 
    931 static DIR *
    932 g_opendir(Char *str, glob_t *pglob)
    933 {
    934 	char buf[MAXPATHLEN];
    935 
    936 	if (!*str)
    937 		strlcpy(buf, ".", sizeof buf);
    938 	else {
    939 		if (g_Ctoc(str, buf, sizeof(buf)))
    940 			return(NULL);
    941 	}
    942 
    943 	if (pglob->gl_flags & GLOB_ALTDIRFUNC)
    944 		return((*pglob->gl_opendir)(buf));
    945 
    946 	return(opendir(buf));
    947 }
    948 
    949 static int
    950 g_lstat(Char *fn, struct stat *sb, glob_t *pglob)
    951 {
    952 	char buf[MAXPATHLEN];
    953 
    954 	if (g_Ctoc(fn, buf, sizeof(buf)))
    955 		return(-1);
    956 	if (pglob->gl_flags & GLOB_ALTDIRFUNC)
    957 		return((*pglob->gl_lstat)(buf, sb));
    958 	return(lstat(buf, sb));
    959 }
    960 
    961 static int
    962 g_stat(Char *fn, struct stat *sb, glob_t *pglob)
    963 {
    964 	char buf[MAXPATHLEN];
    965 
    966 	if (g_Ctoc(fn, buf, sizeof(buf)))
    967 		return(-1);
    968 	if (pglob->gl_flags & GLOB_ALTDIRFUNC)
    969 		return((*pglob->gl_stat)(buf, sb));
    970 	return(stat(buf, sb));
    971 }
    972 
    973 static Char *
    974 g_strchr(const Char *str, int ch)
    975 {
    976 	do {
    977 		if (*str == ch)
    978 			return ((Char *)str);
    979 	} while (*str++);
    980 	return (NULL);
    981 }
    982 
    983 static int
    984 g_Ctoc(const Char *str, char *buf, u_int len)
    985 {
    986 
    987 	while (len--) {
    988 		if ((*buf++ = *str++) == EOS)
    989 			return (0);
    990 	}
    991 	return (1);
    992 }
    993 
    994 #ifdef DEBUG
    995 static void
    996 qprintf(const char *str, Char *s)
    997 {
    998 	Char *p;
    999 
   1000 	(void)printf("%s:\n", str);
   1001 	for (p = s; *p; p++)
   1002 		(void)printf("%c", CHAR(*p));
   1003 	(void)printf("\n");
   1004 	for (p = s; *p; p++)
   1005 		(void)printf("%c", *p & M_PROTECT ? '"' : ' ');
   1006 	(void)printf("\n");
   1007 	for (p = s; *p; p++)
   1008 		(void)printf("%c", ismeta(*p) ? '_' : ' ');
   1009 	(void)printf("\n");
   1010 }
   1011 #endif
   1012 
   1013 #endif /* !defined(HAVE_GLOB) || !defined(GLOB_HAS_ALTDIRFUNC) ||
   1014           !defined(GLOB_HAS_GL_MATCHC) || !defined(GLOB_HAS_GL_STATV) */
   1015