Home | History | Annotate | Line # | Download | only in gen
glob.c revision 1.6 
      1 /*	$NetBSD: glob.c,v 1.6 1997/07/13 19:15:11 christos 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. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the University of
     21  *	California, Berkeley and its contributors.
     22  * 4. Neither the name of the University nor the names of its contributors
     23  *    may be used to endorse or promote products derived from this software
     24  *    without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  * SUCH DAMAGE.
     37  */
     38 
     39 #include <sys/cdefs.h>
     40 #if defined(LIBC_SCCS) && !defined(lint)
     41 #if 0
     42 static char sccsid[] = "@(#)glob.c	8.3 (Berkeley) 10/13/93";
     43 #else
     44 __RCSID("$NetBSD: glob.c,v 1.6 1997/07/13 19:15:11 christos Exp $");
     45 #endif
     46 #endif /* LIBC_SCCS and not lint */
     47 
     48 /*
     49  * glob(3) -- a superset of the one defined in POSIX 1003.2.
     50  *
     51  * The [!...] convention to negate a range is supported (SysV, Posix, ksh).
     52  *
     53  * Optional extra services, controlled by flags not defined by POSIX:
     54  *
     55  * GLOB_QUOTE:
     56  *	Escaping convention: \ inhibits any special meaning the following
     57  *	character might have (except \ at end of string is retained).
     58  * GLOB_MAGCHAR:
     59  *	Set in gl_flags if pattern contained a globbing character.
     60  * GLOB_NOMAGIC:
     61  *	Same as GLOB_NOCHECK, but it will only append pattern if it did
     62  *	not contain any magic characters.  [Used in csh style globbing]
     63  * GLOB_ALTDIRFUNC:
     64  *	Use alternately specified directory access functions.
     65  * GLOB_TILDE:
     66  *	expand ~user/foo to the /home/dir/of/user/foo
     67  * GLOB_BRACE:
     68  *	expand {1,2}{a,b} to 1a 1b 2a 2b
     69  * gl_matchc:
     70  *	Number of matches in the current invocation of glob.
     71  */
     72 
     73 #include <sys/param.h>
     74 #include <sys/stat.h>
     75 
     76 #include <ctype.h>
     77 #include <dirent.h>
     78 #include <errno.h>
     79 #include <glob.h>
     80 #include <pwd.h>
     81 #include <stdio.h>
     82 #include <stdlib.h>
     83 #include <string.h>
     84 #include <unistd.h>
     85 
     86 #define	DOLLAR		'$'
     87 #define	DOT		'.'
     88 #define	EOS		'\0'
     89 #define	LBRACKET	'['
     90 #define	NOT		'!'
     91 #define	QUESTION	'?'
     92 #define	QUOTE		'\\'
     93 #define	RANGE		'-'
     94 #define	RBRACKET	']'
     95 #define	SEP		'/'
     96 #define	STAR		'*'
     97 #define	TILDE		'~'
     98 #define	UNDERSCORE	'_'
     99 #define	LBRACE		'{'
    100 #define	RBRACE		'}'
    101 #define	SLASH		'/'
    102 #define	COMMA		','
    103 
    104 #ifndef DEBUG
    105 
    106 #define	M_QUOTE		0x8000
    107 #define	M_PROTECT	0x4000
    108 #define	M_MASK		0xffff
    109 #define	M_ASCII		0x00ff
    110 
    111 typedef u_short Char;
    112 
    113 #else
    114 
    115 #define	M_QUOTE		0x80
    116 #define	M_PROTECT	0x40
    117 #define	M_MASK		0xff
    118 #define	M_ASCII		0x7f
    119 
    120 typedef char Char;
    121 
    122 #endif
    123 
    124 
    125 #define	CHAR(c)		((Char)((c)&M_ASCII))
    126 #define	META(c)		((Char)((c)|M_QUOTE))
    127 #define	M_ALL		META('*')
    128 #define	M_END		META(']')
    129 #define	M_NOT		META('!')
    130 #define	M_ONE		META('?')
    131 #define	M_RNG		META('-')
    132 #define	M_SET		META('[')
    133 #define	ismeta(c)	(((c)&M_QUOTE) != 0)
    134 
    135 
    136 static int	 compare __P((const void *, const void *));
    137 static void	 g_Ctoc __P((const Char *, char *));
    138 static int	 g_lstat __P((Char *, struct stat *, glob_t *));
    139 static DIR	*g_opendir __P((Char *, glob_t *));
    140 static Char	*g_strchr __P((Char *, int));
    141 #ifdef notdef
    142 static Char	*g_strcat __P((Char *, const Char *));
    143 #endif
    144 static int	 g_stat __P((Char *, struct stat *, glob_t *));
    145 static int	 glob0 __P((const Char *, glob_t *));
    146 static int	 glob1 __P((Char *, glob_t *));
    147 static int	 glob2 __P((Char *, Char *, Char *, glob_t *));
    148 static int	 glob3 __P((Char *, Char *, Char *, Char *, glob_t *));
    149 static int	 globextend __P((const Char *, glob_t *));
    150 static const Char *	 globtilde __P((const Char *, Char *, glob_t *));
    151 static int	 globexp1 __P((const Char *, glob_t *));
    152 static int	 globexp2 __P((const Char *, const Char *, glob_t *, int *));
    153 static int	 match __P((Char *, Char *, Char *));
    154 #ifdef DEBUG
    155 static void	 qprintf __P((const char *, Char *));
    156 #endif
    157 
    158 int
    159 glob(pattern, flags, errfunc, pglob)
    160 	const char *pattern;
    161 	int flags, (*errfunc) __P((const char *, int));
    162 	glob_t *pglob;
    163 {
    164 	const u_char *patnext;
    165 	int c;
    166 	Char *bufnext, *bufend, patbuf[MAXPATHLEN+1];
    167 
    168 	patnext = (u_char *) pattern;
    169 	if (!(flags & GLOB_APPEND)) {
    170 		pglob->gl_pathc = 0;
    171 		pglob->gl_pathv = NULL;
    172 		if (!(flags & GLOB_DOOFFS))
    173 			pglob->gl_offs = 0;
    174 	}
    175 	pglob->gl_flags = flags & ~GLOB_MAGCHAR;
    176 	pglob->gl_errfunc = errfunc;
    177 	pglob->gl_matchc = 0;
    178 
    179 	bufnext = patbuf;
    180 	bufend = bufnext + MAXPATHLEN;
    181 	if (flags & GLOB_QUOTE) {
    182 		/* Protect the quoted characters. */
    183 		while (bufnext < bufend && (c = *patnext++) != EOS)
    184 			if (c == QUOTE) {
    185 				if ((c = *patnext++) == EOS) {
    186 					c = QUOTE;
    187 					--patnext;
    188 				}
    189 				*bufnext++ = c | M_PROTECT;
    190 			}
    191 			else
    192 				*bufnext++ = c;
    193 	}
    194 	else
    195 	    while (bufnext < bufend && (c = *patnext++) != EOS)
    196 		    *bufnext++ = c;
    197 	*bufnext = EOS;
    198 
    199 	if (flags & GLOB_BRACE)
    200 	    return globexp1(patbuf, pglob);
    201 	else
    202 	    return glob0(patbuf, pglob);
    203 }
    204 
    205 /*
    206  * Expand recursively a glob {} pattern. When there is no more expansion
    207  * invoke the standard globbing routine to glob the rest of the magic
    208  * characters
    209  */
    210 static int globexp1(pattern, pglob)
    211 	const Char *pattern;
    212 	glob_t *pglob;
    213 {
    214 	const Char* ptr = pattern;
    215 	int rv;
    216 
    217 	/* Protect a single {}, for find(1), like csh */
    218 	if (pattern[0] == LBRACE && pattern[1] == RBRACE && pattern[2] == EOS)
    219 		return glob0(pattern, pglob);
    220 
    221 	while ((ptr = (const Char *) g_strchr((Char *) ptr, LBRACE)) != NULL)
    222 		if (!globexp2(ptr, pattern, pglob, &rv))
    223 			return rv;
    224 
    225 	return glob0(pattern, pglob);
    226 }
    227 
    228 
    229 /*
    230  * Recursive brace globbing helper. Tries to expand a single brace.
    231  * If it succeeds then it invokes globexp1 with the new pattern.
    232  * If it fails then it tries to glob the rest of the pattern and returns.
    233  */
    234 static int globexp2(ptr, pattern, pglob, rv)
    235 	const Char *ptr, *pattern;
    236 	glob_t *pglob;
    237 	int *rv;
    238 {
    239 	int     i;
    240 	Char   *lm, *ls;
    241 	const Char *pe, *pm, *pl;
    242 	Char    patbuf[MAXPATHLEN + 1];
    243 
    244 	/* copy part up to the brace */
    245 	for (lm = patbuf, pm = pattern; pm != ptr; *lm++ = *pm++)
    246 		continue;
    247 	ls = lm;
    248 
    249 	/* Find the balanced brace */
    250 	for (i = 0, pe = ++ptr; *pe; pe++)
    251 		if (*pe == LBRACKET) {
    252 			/* Ignore everything between [] */
    253 			for (pm = pe++; *pe != RBRACKET && *pe != EOS; pe++)
    254 				continue;
    255 			if (*pe == EOS) {
    256 				/*
    257 				 * We could not find a matching RBRACKET.
    258 				 * Ignore and just look for RBRACE
    259 				 */
    260 				pe = pm;
    261 			}
    262 		}
    263 		else if (*pe == LBRACE)
    264 			i++;
    265 		else if (*pe == RBRACE) {
    266 			if (i == 0)
    267 				break;
    268 			i--;
    269 		}
    270 
    271 	/* Non matching braces; just glob the pattern */
    272 	if (i != 0 || *pe == EOS) {
    273 		*rv = glob0(patbuf, pglob);
    274 		return 0;
    275 	}
    276 
    277 	for (i = 0, pl = pm = ptr; pm <= pe; pm++)
    278 		switch (*pm) {
    279 		case LBRACKET:
    280 			/* Ignore everything between [] */
    281 			for (pl = pm++; *pm != RBRACKET && *pm != EOS; pm++)
    282 				continue;
    283 			if (*pm == EOS) {
    284 				/*
    285 				 * We could not find a matching RBRACKET.
    286 				 * Ignore and just look for RBRACE
    287 				 */
    288 				pm = pl;
    289 			}
    290 			break;
    291 
    292 		case LBRACE:
    293 			i++;
    294 			break;
    295 
    296 		case RBRACE:
    297 			if (i) {
    298 			    i--;
    299 			    break;
    300 			}
    301 			/* FALLTHROUGH */
    302 		case COMMA:
    303 			if (i && *pm == COMMA)
    304 				break;
    305 			else {
    306 				/* Append the current string */
    307 				for (lm = ls; (pl < pm); *lm++ = *pl++)
    308 					continue;
    309 				/*
    310 				 * Append the rest of the pattern after the
    311 				 * closing brace
    312 				 */
    313 				for (pl = pe + 1; (*lm++ = *pl++) != EOS;)
    314 					continue;
    315 
    316 				/* Expand the current pattern */
    317 #ifdef DEBUG
    318 				qprintf("globexp2:", patbuf);
    319 #endif
    320 				*rv = globexp1(patbuf, pglob);
    321 
    322 				/* move after the comma, to the next string */
    323 				pl = pm + 1;
    324 			}
    325 			break;
    326 
    327 		default:
    328 			break;
    329 		}
    330 	*rv = 0;
    331 	return 0;
    332 }
    333 
    334 
    335 
    336 /*
    337  * expand tilde from the passwd file.
    338  */
    339 static const Char *
    340 globtilde(pattern, patbuf, pglob)
    341 	const Char *pattern;
    342 	Char *patbuf;
    343 	glob_t *pglob;
    344 {
    345 	struct passwd *pwd;
    346 	char *h;
    347 	const Char *p;
    348 	Char *b;
    349 
    350 	if (*pattern != TILDE || !(pglob->gl_flags & GLOB_TILDE))
    351 		return pattern;
    352 
    353 	/* Copy up to the end of the string or / */
    354 	for (p = pattern + 1, h = (char *) patbuf; *p && *p != SLASH;
    355 	     *h++ = *p++)
    356 		continue;
    357 
    358 	*h = EOS;
    359 
    360 	if (((char *) patbuf)[0] == EOS) {
    361 		/*
    362 		 * handle a plain ~ or ~/ by expanding $HOME
    363 		 * first and then trying the password file
    364 		 */
    365 		if ((h = getenv("HOME")) == NULL) {
    366 			if ((pwd = getpwuid(getuid())) == NULL)
    367 				return pattern;
    368 			else
    369 				h = pwd->pw_dir;
    370 		}
    371 	}
    372 	else {
    373 		/*
    374 		 * Expand a ~user
    375 		 */
    376 		if ((pwd = getpwnam((char*) patbuf)) == NULL)
    377 			return pattern;
    378 		else
    379 			h = pwd->pw_dir;
    380 	}
    381 
    382 	/* Copy the home directory */
    383 	for (b = patbuf; *h; *b++ = *h++)
    384 		continue;
    385 
    386 	/* Append the rest of the pattern */
    387 	while ((*b++ = *p++) != EOS)
    388 		continue;
    389 
    390 	return patbuf;
    391 }
    392 
    393 
    394 /*
    395  * The main glob() routine: compiles the pattern (optionally processing
    396  * quotes), calls glob1() to do the real pattern matching, and finally
    397  * sorts the list (unless unsorted operation is requested).  Returns 0
    398  * if things went well, nonzero if errors occurred.  It is not an error
    399  * to find no matches.
    400  */
    401 static int
    402 glob0(pattern, pglob)
    403 	const Char *pattern;
    404 	glob_t *pglob;
    405 {
    406 	const Char *qpatnext;
    407 	int c, err, oldpathc;
    408 	Char *bufnext, patbuf[MAXPATHLEN+1];
    409 
    410 	qpatnext = globtilde(pattern, patbuf, pglob);
    411 	oldpathc = pglob->gl_pathc;
    412 	bufnext = patbuf;
    413 
    414 	/* We don't need to check for buffer overflow any more. */
    415 	while ((c = *qpatnext++) != EOS) {
    416 		switch (c) {
    417 		case LBRACKET:
    418 			c = *qpatnext;
    419 			if (c == NOT)
    420 				++qpatnext;
    421 			if (*qpatnext == EOS ||
    422 			    g_strchr((Char *) qpatnext+1, RBRACKET) == NULL) {
    423 				*bufnext++ = LBRACKET;
    424 				if (c == NOT)
    425 					--qpatnext;
    426 				break;
    427 			}
    428 			*bufnext++ = M_SET;
    429 			if (c == NOT)
    430 				*bufnext++ = M_NOT;
    431 			c = *qpatnext++;
    432 			do {
    433 				*bufnext++ = CHAR(c);
    434 				if (*qpatnext == RANGE &&
    435 				    (c = qpatnext[1]) != RBRACKET) {
    436 					*bufnext++ = M_RNG;
    437 					*bufnext++ = CHAR(c);
    438 					qpatnext += 2;
    439 				}
    440 			} while ((c = *qpatnext++) != RBRACKET);
    441 			pglob->gl_flags |= GLOB_MAGCHAR;
    442 			*bufnext++ = M_END;
    443 			break;
    444 		case QUESTION:
    445 			pglob->gl_flags |= GLOB_MAGCHAR;
    446 			*bufnext++ = M_ONE;
    447 			break;
    448 		case STAR:
    449 			pglob->gl_flags |= GLOB_MAGCHAR;
    450 			/* collapse adjacent stars to one,
    451 			 * to avoid exponential behavior
    452 			 */
    453 			if (bufnext == patbuf || bufnext[-1] != M_ALL)
    454 			    *bufnext++ = M_ALL;
    455 			break;
    456 		default:
    457 			*bufnext++ = CHAR(c);
    458 			break;
    459 		}
    460 	}
    461 	*bufnext = EOS;
    462 #ifdef DEBUG
    463 	qprintf("glob0:", patbuf);
    464 #endif
    465 
    466 	if ((err = glob1(patbuf, pglob)) != 0)
    467 		return(err);
    468 
    469 	/*
    470 	 * If there was no match we are going to append the pattern
    471 	 * if GLOB_NOCHECK was specified or if GLOB_NOMAGIC was specified
    472 	 * and the pattern did not contain any magic characters
    473 	 * GLOB_NOMAGIC is there just for compatibility with csh.
    474 	 */
    475 	if (pglob->gl_pathc == oldpathc &&
    476 	    ((pglob->gl_flags & GLOB_NOCHECK) ||
    477 	      ((pglob->gl_flags & GLOB_NOMAGIC) &&
    478 	       !(pglob->gl_flags & GLOB_MAGCHAR))))
    479 		return(globextend(pattern, pglob));
    480 	else if (!(pglob->gl_flags & GLOB_NOSORT))
    481 		qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc,
    482 		    pglob->gl_pathc - oldpathc, sizeof(char *), compare);
    483 	return(0);
    484 }
    485 
    486 static int
    487 compare(p, q)
    488 	const void *p, *q;
    489 {
    490 	return(strcmp(*(char **)p, *(char **)q));
    491 }
    492 
    493 static int
    494 glob1(pattern, pglob)
    495 	Char *pattern;
    496 	glob_t *pglob;
    497 {
    498 	Char pathbuf[MAXPATHLEN+1];
    499 
    500 	/* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */
    501 	if (*pattern == EOS)
    502 		return(0);
    503 	return(glob2(pathbuf, pathbuf, pattern, pglob));
    504 }
    505 
    506 /*
    507  * The functions glob2 and glob3 are mutually recursive; there is one level
    508  * of recursion for each segment in the pattern that contains one or more
    509  * meta characters.
    510  */
    511 static int
    512 glob2(pathbuf, pathend, pattern, pglob)
    513 	Char *pathbuf, *pathend, *pattern;
    514 	glob_t *pglob;
    515 {
    516 	struct stat sb;
    517 	Char *p, *q;
    518 	int anymeta;
    519 
    520 	/*
    521 	 * Loop over pattern segments until end of pattern or until
    522 	 * segment with meta character found.
    523 	 */
    524 	for (anymeta = 0;;) {
    525 		if (*pattern == EOS) {		/* End of pattern? */
    526 			*pathend = EOS;
    527 			if (g_lstat(pathbuf, &sb, pglob))
    528 				return(0);
    529 
    530 			if (((pglob->gl_flags & GLOB_MARK) &&
    531 			    pathend[-1] != SEP) && (S_ISDIR(sb.st_mode)
    532 			    || (S_ISLNK(sb.st_mode) &&
    533 			    (g_stat(pathbuf, &sb, pglob) == 0) &&
    534 			    S_ISDIR(sb.st_mode)))) {
    535 				*pathend++ = SEP;
    536 				*pathend = EOS;
    537 			}
    538 			++pglob->gl_matchc;
    539 			return(globextend(pathbuf, pglob));
    540 		}
    541 
    542 		/* Find end of next segment, copy tentatively to pathend. */
    543 		q = pathend;
    544 		p = pattern;
    545 		while (*p != EOS && *p != SEP) {
    546 			if (ismeta(*p))
    547 				anymeta = 1;
    548 			*q++ = *p++;
    549 		}
    550 
    551 		if (!anymeta) {		/* No expansion, do next segment. */
    552 			pathend = q;
    553 			pattern = p;
    554 			while (*pattern == SEP)
    555 				*pathend++ = *pattern++;
    556 		} else			/* Need expansion, recurse. */
    557 			return(glob3(pathbuf, pathend, pattern, p, pglob));
    558 	}
    559 	/* NOTREACHED */
    560 }
    561 
    562 static int
    563 glob3(pathbuf, pathend, pattern, restpattern, pglob)
    564 	Char *pathbuf, *pathend, *pattern, *restpattern;
    565 	glob_t *pglob;
    566 {
    567 	register struct dirent *dp;
    568 	DIR *dirp;
    569 	int err;
    570 	char buf[MAXPATHLEN];
    571 
    572 	/*
    573 	 * The readdirfunc declaration can't be prototyped, because it is
    574 	 * assigned, below, to two functions which are prototyped in glob.h
    575 	 * and dirent.h as taking pointers to differently typed opaque
    576 	 * structures.
    577 	 */
    578 	struct dirent *(*readdirfunc) __P((void *));
    579 
    580 	*pathend = EOS;
    581 	errno = 0;
    582 
    583 	if ((dirp = g_opendir(pathbuf, pglob)) == NULL) {
    584 		/* TODO: don't call for ENOENT or ENOTDIR? */
    585 		if (pglob->gl_errfunc) {
    586 			g_Ctoc(pathbuf, buf);
    587 			if (pglob->gl_errfunc(buf, errno) ||
    588 			    pglob->gl_flags & GLOB_ERR)
    589 				return (GLOB_ABEND);
    590 		}
    591 		return(0);
    592 	}
    593 
    594 	err = 0;
    595 
    596 	/* Search directory for matching names. */
    597 	if (pglob->gl_flags & GLOB_ALTDIRFUNC)
    598 		readdirfunc = pglob->gl_readdir;
    599 	else
    600 		readdirfunc = (struct dirent *(*)__P((void *))) readdir;
    601 	while ((dp = (*readdirfunc)(dirp))) {
    602 		register u_char *sc;
    603 		register Char *dc;
    604 
    605 		/* Initial DOT must be matched literally. */
    606 		if (dp->d_name[0] == DOT && *pattern != DOT)
    607 			continue;
    608 		for (sc = (u_char *) dp->d_name, dc = pathend;
    609 		     (*dc++ = *sc++) != EOS;)
    610 			continue;
    611 		if (!match(pathend, pattern, restpattern)) {
    612 			*pathend = EOS;
    613 			continue;
    614 		}
    615 		err = glob2(pathbuf, --dc, restpattern, pglob);
    616 		if (err)
    617 			break;
    618 	}
    619 
    620 	if (pglob->gl_flags & GLOB_ALTDIRFUNC)
    621 		(*pglob->gl_closedir)(dirp);
    622 	else
    623 		closedir(dirp);
    624 	return(err);
    625 }
    626 
    627 
    628 /*
    629  * Extend the gl_pathv member of a glob_t structure to accomodate a new item,
    630  * add the new item, and update gl_pathc.
    631  *
    632  * This assumes the BSD realloc, which only copies the block when its size
    633  * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
    634  * behavior.
    635  *
    636  * Return 0 if new item added, error code if memory couldn't be allocated.
    637  *
    638  * Invariant of the glob_t structure:
    639  *	Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
    640  *	gl_pathv points to (gl_offs + gl_pathc + 1) items.
    641  */
    642 static int
    643 globextend(path, pglob)
    644 	const Char *path;
    645 	glob_t *pglob;
    646 {
    647 	register char **pathv;
    648 	register int i;
    649 	u_int newsize;
    650 	char *copy;
    651 	const Char *p;
    652 
    653 	newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs);
    654 	pathv = pglob->gl_pathv ?
    655 		    realloc((char *)pglob->gl_pathv, newsize) :
    656 		    malloc(newsize);
    657 	if (pathv == NULL)
    658 		return(GLOB_NOSPACE);
    659 
    660 	if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
    661 		/* first time around -- clear initial gl_offs items */
    662 		pathv += pglob->gl_offs;
    663 		for (i = pglob->gl_offs; --i >= 0; )
    664 			*--pathv = NULL;
    665 	}
    666 	pglob->gl_pathv = pathv;
    667 
    668 	for (p = path; *p++;)
    669 		continue;
    670 	if ((copy = malloc(p - path)) != NULL) {
    671 		g_Ctoc(path, copy);
    672 		pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
    673 	}
    674 	pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
    675 	return(copy == NULL ? GLOB_NOSPACE : 0);
    676 }
    677 
    678 
    679 /*
    680  * pattern matching function for filenames.  Each occurrence of the *
    681  * pattern causes a recursion level.
    682  */
    683 static int
    684 match(name, pat, patend)
    685 	register Char *name, *pat, *patend;
    686 {
    687 	int ok, negate_range;
    688 	Char c, k;
    689 
    690 	while (pat < patend) {
    691 		c = *pat++;
    692 		switch (c & M_MASK) {
    693 		case M_ALL:
    694 			if (pat == patend)
    695 				return(1);
    696 			do
    697 			    if (match(name, pat, patend))
    698 				    return(1);
    699 			while (*name++ != EOS);
    700 			return(0);
    701 		case M_ONE:
    702 			if (*name++ == EOS)
    703 				return(0);
    704 			break;
    705 		case M_SET:
    706 			ok = 0;
    707 			if ((k = *name++) == EOS)
    708 				return(0);
    709 			if ((negate_range = ((*pat & M_MASK) == M_NOT)) != EOS)
    710 				++pat;
    711 			while (((c = *pat++) & M_MASK) != M_END)
    712 				if ((*pat & M_MASK) == M_RNG) {
    713 					if (c <= k && k <= pat[1])
    714 						ok = 1;
    715 					pat += 2;
    716 				} else if (c == k)
    717 					ok = 1;
    718 			if (ok == negate_range)
    719 				return(0);
    720 			break;
    721 		default:
    722 			if (*name++ != c)
    723 				return(0);
    724 			break;
    725 		}
    726 	}
    727 	return(*name == EOS);
    728 }
    729 
    730 /* Free allocated data belonging to a glob_t structure. */
    731 void
    732 globfree(pglob)
    733 	glob_t *pglob;
    734 {
    735 	register int i;
    736 	register char **pp;
    737 
    738 	if (pglob->gl_pathv != NULL) {
    739 		pp = pglob->gl_pathv + pglob->gl_offs;
    740 		for (i = pglob->gl_pathc; i--; ++pp)
    741 			if (*pp)
    742 				free(*pp);
    743 		free(pglob->gl_pathv);
    744 	}
    745 }
    746 
    747 static DIR *
    748 g_opendir(str, pglob)
    749 	register Char *str;
    750 	glob_t *pglob;
    751 {
    752 	char buf[MAXPATHLEN];
    753 
    754 	if (!*str)
    755 		strcpy(buf, ".");
    756 	else
    757 		g_Ctoc(str, buf);
    758 
    759 	if (pglob->gl_flags & GLOB_ALTDIRFUNC)
    760 		return((*pglob->gl_opendir)(buf));
    761 
    762 	return(opendir(buf));
    763 }
    764 
    765 static int
    766 g_lstat(fn, sb, pglob)
    767 	register Char *fn;
    768 	struct stat *sb;
    769 	glob_t *pglob;
    770 {
    771 	char buf[MAXPATHLEN];
    772 
    773 	g_Ctoc(fn, buf);
    774 	if (pglob->gl_flags & GLOB_ALTDIRFUNC)
    775 		return((*pglob->gl_lstat)(buf, sb));
    776 	return(lstat(buf, sb));
    777 }
    778 
    779 static int
    780 g_stat(fn, sb, pglob)
    781 	register Char *fn;
    782 	struct stat *sb;
    783 	glob_t *pglob;
    784 {
    785 	char buf[MAXPATHLEN];
    786 
    787 	g_Ctoc(fn, buf);
    788 	if (pglob->gl_flags & GLOB_ALTDIRFUNC)
    789 		return((*pglob->gl_stat)(buf, sb));
    790 	return(stat(buf, sb));
    791 }
    792 
    793 static Char *
    794 g_strchr(str, ch)
    795 	Char *str;
    796 	int ch;
    797 {
    798 	do {
    799 		if (*str == ch)
    800 			return (str);
    801 	} while (*str++);
    802 	return (NULL);
    803 }
    804 
    805 #ifdef notdef
    806 static Char *
    807 g_strcat(dst, src)
    808 	Char *dst;
    809 	const Char* src;
    810 {
    811 	Char *sdst = dst;
    812 
    813 	while (*dst++)
    814 		continue;
    815 	--dst;
    816 	while((*dst++ = *src++) != EOS)
    817 	    continue;
    818 
    819 	return (sdst);
    820 }
    821 #endif
    822 
    823 static void
    824 g_Ctoc(str, buf)
    825 	register const Char *str;
    826 	char *buf;
    827 {
    828 	register char *dc;
    829 
    830 	for (dc = buf; (*dc++ = *str++) != EOS;)
    831 		continue;
    832 }
    833 
    834 #ifdef DEBUG
    835 static void
    836 qprintf(str, s)
    837 	const char *str;
    838 	register Char *s;
    839 {
    840 	register Char *p;
    841 
    842 	(void)printf("%s:\n", str);
    843 	for (p = s; *p; p++)
    844 		(void)printf("%c", CHAR(*p));
    845 	(void)printf("\n");
    846 	for (p = s; *p; p++)
    847 		(void)printf("%c", *p & M_PROTECT ? '"' : ' ');
    848 	(void)printf("\n");
    849 	for (p = s; *p; p++)
    850 		(void)printf("%c", ismeta(*p) ? '_' : ' ');
    851 	(void)printf("\n");
    852 }
    853 #endif
    854