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glob.c revision 1.5 
      1 /*	$NetBSD: glob.c,v 1.5 1995/02/27 04:13:35 cgd 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 #if defined(LIBC_SCCS) && !defined(lint)
     40 #if 0
     41 static char sccsid[] = "@(#)glob.c	8.3 (Berkeley) 10/13/93";
     42 #else
     43 static char rcsid[] = "$NetBSD: glob.c,v 1.5 1995/02/27 04:13:35 cgd Exp $";
     44 #endif
     45 #endif /* LIBC_SCCS and not lint */
     46 
     47 /*
     48  * glob(3) -- a superset of the one defined in POSIX 1003.2.
     49  *
     50  * The [!...] convention to negate a range is supported (SysV, Posix, ksh).
     51  *
     52  * Optional extra services, controlled by flags not defined by POSIX:
     53  *
     54  * GLOB_QUOTE:
     55  *	Escaping convention: \ inhibits any special meaning the following
     56  *	character might have (except \ at end of string is retained).
     57  * GLOB_MAGCHAR:
     58  *	Set in gl_flags if pattern contained a globbing character.
     59  * GLOB_NOMAGIC:
     60  *	Same as GLOB_NOCHECK, but it will only append pattern if it did
     61  *	not contain any magic characters.  [Used in csh style globbing]
     62  * GLOB_ALTDIRFUNC:
     63  *	Use alternately specified directory access functions.
     64  * GLOB_TILDE:
     65  *	expand ~user/foo to the /home/dir/of/user/foo
     66  * GLOB_BRACE:
     67  *	expand {1,2}{a,b} to 1a 1b 2a 2b
     68  * gl_matchc:
     69  *	Number of matches in the current invocation of glob.
     70  */
     71 
     72 #include <sys/param.h>
     73 #include <sys/stat.h>
     74 
     75 #include <ctype.h>
     76 #include <dirent.h>
     77 #include <errno.h>
     78 #include <glob.h>
     79 #include <pwd.h>
     80 #include <stdio.h>
     81 #include <stdlib.h>
     82 #include <string.h>
     83 #include <unistd.h>
     84 
     85 #define	DOLLAR		'$'
     86 #define	DOT		'.'
     87 #define	EOS		'\0'
     88 #define	LBRACKET	'['
     89 #define	NOT		'!'
     90 #define	QUESTION	'?'
     91 #define	QUOTE		'\\'
     92 #define	RANGE		'-'
     93 #define	RBRACKET	']'
     94 #define	SEP		'/'
     95 #define	STAR		'*'
     96 #define	TILDE		'~'
     97 #define	UNDERSCORE	'_'
     98 #define	LBRACE		'{'
     99 #define	RBRACE		'}'
    100 #define	SLASH		'/'
    101 #define	COMMA		','
    102 
    103 #ifndef DEBUG
    104 
    105 #define	M_QUOTE		0x8000
    106 #define	M_PROTECT	0x4000
    107 #define	M_MASK		0xffff
    108 #define	M_ASCII		0x00ff
    109 
    110 typedef u_short Char;
    111 
    112 #else
    113 
    114 #define	M_QUOTE		0x80
    115 #define	M_PROTECT	0x40
    116 #define	M_MASK		0xff
    117 #define	M_ASCII		0x7f
    118 
    119 typedef char Char;
    120 
    121 #endif
    122 
    123 
    124 #define	CHAR(c)		((Char)((c)&M_ASCII))
    125 #define	META(c)		((Char)((c)|M_QUOTE))
    126 #define	M_ALL		META('*')
    127 #define	M_END		META(']')
    128 #define	M_NOT		META('!')
    129 #define	M_ONE		META('?')
    130 #define	M_RNG		META('-')
    131 #define	M_SET		META('[')
    132 #define	ismeta(c)	(((c)&M_QUOTE) != 0)
    133 
    134 
    135 static int	 compare __P((const void *, const void *));
    136 static void	 g_Ctoc __P((const Char *, char *));
    137 static int	 g_lstat __P((Char *, struct stat *, glob_t *));
    138 static DIR	*g_opendir __P((Char *, glob_t *));
    139 static Char	*g_strchr __P((Char *, int));
    140 #ifdef notdef
    141 static Char	*g_strcat __P((Char *, const Char *));
    142 #endif
    143 static int	 g_stat __P((Char *, struct stat *, glob_t *));
    144 static int	 glob0 __P((const Char *, glob_t *));
    145 static int	 glob1 __P((Char *, glob_t *));
    146 static int	 glob2 __P((Char *, Char *, Char *, glob_t *));
    147 static int	 glob3 __P((Char *, Char *, Char *, Char *, glob_t *));
    148 static int	 globextend __P((const Char *, glob_t *));
    149 static const Char *	 globtilde __P((const Char *, Char *, glob_t *));
    150 static int	 globexp1 __P((const Char *, glob_t *));
    151 static int	 globexp2 __P((const Char *, const Char *, glob_t *, int *));
    152 static int	 match __P((Char *, Char *, Char *));
    153 #ifdef DEBUG
    154 static void	 qprintf __P((const char *, Char *));
    155 #endif
    156 
    157 int
    158 glob(pattern, flags, errfunc, pglob)
    159 	const char *pattern;
    160 	int flags, (*errfunc) __P((const char *, int));
    161 	glob_t *pglob;
    162 {
    163 	const u_char *patnext;
    164 	int c;
    165 	Char *bufnext, *bufend, patbuf[MAXPATHLEN+1];
    166 
    167 	patnext = (u_char *) pattern;
    168 	if (!(flags & GLOB_APPEND)) {
    169 		pglob->gl_pathc = 0;
    170 		pglob->gl_pathv = NULL;
    171 		if (!(flags & GLOB_DOOFFS))
    172 			pglob->gl_offs = 0;
    173 	}
    174 	pglob->gl_flags = flags & ~GLOB_MAGCHAR;
    175 	pglob->gl_errfunc = errfunc;
    176 	pglob->gl_matchc = 0;
    177 
    178 	bufnext = patbuf;
    179 	bufend = bufnext + MAXPATHLEN;
    180 	if (flags & GLOB_QUOTE) {
    181 		/* Protect the quoted characters. */
    182 		while (bufnext < bufend && (c = *patnext++) != EOS)
    183 			if (c == QUOTE) {
    184 				if ((c = *patnext++) == EOS) {
    185 					c = QUOTE;
    186 					--patnext;
    187 				}
    188 				*bufnext++ = c | M_PROTECT;
    189 			}
    190 			else
    191 				*bufnext++ = c;
    192 	}
    193 	else
    194 	    while (bufnext < bufend && (c = *patnext++) != EOS)
    195 		    *bufnext++ = c;
    196 	*bufnext = EOS;
    197 
    198 	if (flags & GLOB_BRACE)
    199 	    return globexp1(patbuf, pglob);
    200 	else
    201 	    return glob0(patbuf, pglob);
    202 }
    203 
    204 /*
    205  * Expand recursively a glob {} pattern. When there is no more expansion
    206  * invoke the standard globbing routine to glob the rest of the magic
    207  * characters
    208  */
    209 static int globexp1(pattern, pglob)
    210 	const Char *pattern;
    211 	glob_t *pglob;
    212 {
    213 	const Char* ptr = pattern;
    214 	int rv;
    215 
    216 	/* Protect a single {}, for find(1), like csh */
    217 	if (pattern[0] == LBRACE && pattern[1] == RBRACE && pattern[2] == EOS)
    218 		return glob0(pattern, pglob);
    219 
    220 	while ((ptr = (const Char *) g_strchr((Char *) ptr, LBRACE)) != NULL)
    221 		if (!globexp2(ptr, pattern, pglob, &rv))
    222 			return rv;
    223 
    224 	return glob0(pattern, pglob);
    225 }
    226 
    227 
    228 /*
    229  * Recursive brace globbing helper. Tries to expand a single brace.
    230  * If it succeeds then it invokes globexp1 with the new pattern.
    231  * If it fails then it tries to glob the rest of the pattern and returns.
    232  */
    233 static int globexp2(ptr, pattern, pglob, rv)
    234 	const Char *ptr, *pattern;
    235 	glob_t *pglob;
    236 	int *rv;
    237 {
    238 	int     i;
    239 	Char   *lm, *ls;
    240 	const Char *pe, *pm, *pl;
    241 	Char    patbuf[MAXPATHLEN + 1];
    242 
    243 	/* copy part up to the brace */
    244 	for (lm = patbuf, pm = pattern; pm != ptr; *lm++ = *pm++)
    245 		continue;
    246 	ls = lm;
    247 
    248 	/* Find the balanced brace */
    249 	for (i = 0, pe = ++ptr; *pe; pe++)
    250 		if (*pe == LBRACKET) {
    251 			/* Ignore everything between [] */
    252 			for (pm = pe++; *pe != RBRACKET && *pe != EOS; pe++)
    253 				continue;
    254 			if (*pe == EOS) {
    255 				/*
    256 				 * We could not find a matching RBRACKET.
    257 				 * Ignore and just look for RBRACE
    258 				 */
    259 				pe = pm;
    260 			}
    261 		}
    262 		else if (*pe == LBRACE)
    263 			i++;
    264 		else if (*pe == RBRACE) {
    265 			if (i == 0)
    266 				break;
    267 			i--;
    268 		}
    269 
    270 	/* Non matching braces; just glob the pattern */
    271 	if (i != 0 || *pe == EOS) {
    272 		*rv = glob0(patbuf, pglob);
    273 		return 0;
    274 	}
    275 
    276 	for (i = 0, pl = pm = ptr; pm <= pe; pm++)
    277 		switch (*pm) {
    278 		case LBRACKET:
    279 			/* Ignore everything between [] */
    280 			for (pl = pm++; *pm != RBRACKET && *pm != EOS; pm++)
    281 				continue;
    282 			if (*pm == EOS) {
    283 				/*
    284 				 * We could not find a matching RBRACKET.
    285 				 * Ignore and just look for RBRACE
    286 				 */
    287 				pm = pl;
    288 			}
    289 			break;
    290 
    291 		case LBRACE:
    292 			i++;
    293 			break;
    294 
    295 		case RBRACE:
    296 			if (i) {
    297 			    i--;
    298 			    break;
    299 			}
    300 			/* FALLTHROUGH */
    301 		case COMMA:
    302 			if (i && *pm == COMMA)
    303 				break;
    304 			else {
    305 				/* Append the current string */
    306 				for (lm = ls; (pl < pm); *lm++ = *pl++)
    307 					continue;
    308 				/*
    309 				 * Append the rest of the pattern after the
    310 				 * closing brace
    311 				 */
    312 				for (pl = pe + 1; (*lm++ = *pl++) != EOS;)
    313 					continue;
    314 
    315 				/* Expand the current pattern */
    316 #ifdef DEBUG
    317 				qprintf("globexp2:", patbuf);
    318 #endif
    319 				*rv = globexp1(patbuf, pglob);
    320 
    321 				/* move after the comma, to the next string */
    322 				pl = pm + 1;
    323 			}
    324 			break;
    325 
    326 		default:
    327 			break;
    328 		}
    329 	*rv = 0;
    330 	return 0;
    331 }
    332 
    333 
    334 
    335 /*
    336  * expand tilde from the passwd file.
    337  */
    338 static const Char *
    339 globtilde(pattern, patbuf, pglob)
    340 	const Char *pattern;
    341 	Char *patbuf;
    342 	glob_t *pglob;
    343 {
    344 	struct passwd *pwd;
    345 	char *h;
    346 	const Char *p;
    347 	Char *b;
    348 
    349 	if (*pattern != TILDE || !(pglob->gl_flags & GLOB_TILDE))
    350 		return pattern;
    351 
    352 	/* Copy up to the end of the string or / */
    353 	for (p = pattern + 1, h = (char *) patbuf; *p && *p != SLASH;
    354 	     *h++ = *p++)
    355 		continue;
    356 
    357 	*h = EOS;
    358 
    359 	if (((char *) patbuf)[0] == EOS) {
    360 		/*
    361 		 * handle a plain ~ or ~/ by expanding $HOME
    362 		 * first and then trying the password file
    363 		 */
    364 		if ((h = getenv("HOME")) == NULL) {
    365 			if ((pwd = getpwuid(getuid())) == NULL)
    366 				return pattern;
    367 			else
    368 				h = pwd->pw_dir;
    369 		}
    370 	}
    371 	else {
    372 		/*
    373 		 * Expand a ~user
    374 		 */
    375 		if ((pwd = getpwnam((char*) patbuf)) == NULL)
    376 			return pattern;
    377 		else
    378 			h = pwd->pw_dir;
    379 	}
    380 
    381 	/* Copy the home directory */
    382 	for (b = patbuf; *h; *b++ = *h++)
    383 		continue;
    384 
    385 	/* Append the rest of the pattern */
    386 	while ((*b++ = *p++) != EOS)
    387 		continue;
    388 
    389 	return patbuf;
    390 }
    391 
    392 
    393 /*
    394  * The main glob() routine: compiles the pattern (optionally processing
    395  * quotes), calls glob1() to do the real pattern matching, and finally
    396  * sorts the list (unless unsorted operation is requested).  Returns 0
    397  * if things went well, nonzero if errors occurred.  It is not an error
    398  * to find no matches.
    399  */
    400 static int
    401 glob0(pattern, pglob)
    402 	const Char *pattern;
    403 	glob_t *pglob;
    404 {
    405 	const Char *qpatnext;
    406 	int c, err, oldpathc;
    407 	Char *bufnext, patbuf[MAXPATHLEN+1];
    408 
    409 	qpatnext = globtilde(pattern, patbuf, pglob);
    410 	oldpathc = pglob->gl_pathc;
    411 	bufnext = patbuf;
    412 
    413 	/* We don't need to check for buffer overflow any more. */
    414 	while ((c = *qpatnext++) != EOS) {
    415 		switch (c) {
    416 		case LBRACKET:
    417 			c = *qpatnext;
    418 			if (c == NOT)
    419 				++qpatnext;
    420 			if (*qpatnext == EOS ||
    421 			    g_strchr((Char *) qpatnext+1, RBRACKET) == NULL) {
    422 				*bufnext++ = LBRACKET;
    423 				if (c == NOT)
    424 					--qpatnext;
    425 				break;
    426 			}
    427 			*bufnext++ = M_SET;
    428 			if (c == NOT)
    429 				*bufnext++ = M_NOT;
    430 			c = *qpatnext++;
    431 			do {
    432 				*bufnext++ = CHAR(c);
    433 				if (*qpatnext == RANGE &&
    434 				    (c = qpatnext[1]) != RBRACKET) {
    435 					*bufnext++ = M_RNG;
    436 					*bufnext++ = CHAR(c);
    437 					qpatnext += 2;
    438 				}
    439 			} while ((c = *qpatnext++) != RBRACKET);
    440 			pglob->gl_flags |= GLOB_MAGCHAR;
    441 			*bufnext++ = M_END;
    442 			break;
    443 		case QUESTION:
    444 			pglob->gl_flags |= GLOB_MAGCHAR;
    445 			*bufnext++ = M_ONE;
    446 			break;
    447 		case STAR:
    448 			pglob->gl_flags |= GLOB_MAGCHAR;
    449 			/* collapse adjacent stars to one,
    450 			 * to avoid exponential behavior
    451 			 */
    452 			if (bufnext == patbuf || bufnext[-1] != M_ALL)
    453 			    *bufnext++ = M_ALL;
    454 			break;
    455 		default:
    456 			*bufnext++ = CHAR(c);
    457 			break;
    458 		}
    459 	}
    460 	*bufnext = EOS;
    461 #ifdef DEBUG
    462 	qprintf("glob0:", patbuf);
    463 #endif
    464 
    465 	if ((err = glob1(patbuf, pglob)) != 0)
    466 		return(err);
    467 
    468 	/*
    469 	 * If there was no match we are going to append the pattern
    470 	 * if GLOB_NOCHECK was specified or if GLOB_NOMAGIC was specified
    471 	 * and the pattern did not contain any magic characters
    472 	 * GLOB_NOMAGIC is there just for compatibility with csh.
    473 	 */
    474 	if (pglob->gl_pathc == oldpathc &&
    475 	    ((pglob->gl_flags & GLOB_NOCHECK) ||
    476 	      ((pglob->gl_flags & GLOB_NOMAGIC) &&
    477 	       !(pglob->gl_flags & GLOB_MAGCHAR))))
    478 		return(globextend(pattern, pglob));
    479 	else if (!(pglob->gl_flags & GLOB_NOSORT))
    480 		qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc,
    481 		    pglob->gl_pathc - oldpathc, sizeof(char *), compare);
    482 	return(0);
    483 }
    484 
    485 static int
    486 compare(p, q)
    487 	const void *p, *q;
    488 {
    489 	return(strcmp(*(char **)p, *(char **)q));
    490 }
    491 
    492 static int
    493 glob1(pattern, pglob)
    494 	Char *pattern;
    495 	glob_t *pglob;
    496 {
    497 	Char pathbuf[MAXPATHLEN+1];
    498 
    499 	/* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */
    500 	if (*pattern == EOS)
    501 		return(0);
    502 	return(glob2(pathbuf, pathbuf, pattern, pglob));
    503 }
    504 
    505 /*
    506  * The functions glob2 and glob3 are mutually recursive; there is one level
    507  * of recursion for each segment in the pattern that contains one or more
    508  * meta characters.
    509  */
    510 static int
    511 glob2(pathbuf, pathend, pattern, pglob)
    512 	Char *pathbuf, *pathend, *pattern;
    513 	glob_t *pglob;
    514 {
    515 	struct stat sb;
    516 	Char *p, *q;
    517 	int anymeta;
    518 
    519 	/*
    520 	 * Loop over pattern segments until end of pattern or until
    521 	 * segment with meta character found.
    522 	 */
    523 	for (anymeta = 0;;) {
    524 		if (*pattern == EOS) {		/* End of pattern? */
    525 			*pathend = EOS;
    526 			if (g_lstat(pathbuf, &sb, pglob))
    527 				return(0);
    528 
    529 			if (((pglob->gl_flags & GLOB_MARK) &&
    530 			    pathend[-1] != SEP) && (S_ISDIR(sb.st_mode)
    531 			    || (S_ISLNK(sb.st_mode) &&
    532 			    (g_stat(pathbuf, &sb, pglob) == 0) &&
    533 			    S_ISDIR(sb.st_mode)))) {
    534 				*pathend++ = SEP;
    535 				*pathend = EOS;
    536 			}
    537 			++pglob->gl_matchc;
    538 			return(globextend(pathbuf, pglob));
    539 		}
    540 
    541 		/* Find end of next segment, copy tentatively to pathend. */
    542 		q = pathend;
    543 		p = pattern;
    544 		while (*p != EOS && *p != SEP) {
    545 			if (ismeta(*p))
    546 				anymeta = 1;
    547 			*q++ = *p++;
    548 		}
    549 
    550 		if (!anymeta) {		/* No expansion, do next segment. */
    551 			pathend = q;
    552 			pattern = p;
    553 			while (*pattern == SEP)
    554 				*pathend++ = *pattern++;
    555 		} else			/* Need expansion, recurse. */
    556 			return(glob3(pathbuf, pathend, pattern, p, pglob));
    557 	}
    558 	/* NOTREACHED */
    559 }
    560 
    561 static int
    562 glob3(pathbuf, pathend, pattern, restpattern, pglob)
    563 	Char *pathbuf, *pathend, *pattern, *restpattern;
    564 	glob_t *pglob;
    565 {
    566 	register struct dirent *dp;
    567 	DIR *dirp;
    568 	int err;
    569 	char buf[MAXPATHLEN];
    570 
    571 	/*
    572 	 * The readdirfunc declaration can't be prototyped, because it is
    573 	 * assigned, below, to two functions which are prototyped in glob.h
    574 	 * and dirent.h as taking pointers to differently typed opaque
    575 	 * structures.
    576 	 */
    577 	struct dirent *(*readdirfunc)();
    578 
    579 	*pathend = EOS;
    580 	errno = 0;
    581 
    582 	if ((dirp = g_opendir(pathbuf, pglob)) == NULL) {
    583 		/* TODO: don't call for ENOENT or ENOTDIR? */
    584 		if (pglob->gl_errfunc) {
    585 			g_Ctoc(pathbuf, buf);
    586 			if (pglob->gl_errfunc(buf, errno) ||
    587 			    pglob->gl_flags & GLOB_ERR)
    588 				return (GLOB_ABEND);
    589 		}
    590 		return(0);
    591 	}
    592 
    593 	err = 0;
    594 
    595 	/* Search directory for matching names. */
    596 	if (pglob->gl_flags & GLOB_ALTDIRFUNC)
    597 		readdirfunc = pglob->gl_readdir;
    598 	else
    599 		readdirfunc = readdir;
    600 	while ((dp = (*readdirfunc)(dirp))) {
    601 		register u_char *sc;
    602 		register Char *dc;
    603 
    604 		/* Initial DOT must be matched literally. */
    605 		if (dp->d_name[0] == DOT && *pattern != DOT)
    606 			continue;
    607 		for (sc = (u_char *) dp->d_name, dc = pathend;
    608 		     (*dc++ = *sc++) != EOS;)
    609 			continue;
    610 		if (!match(pathend, pattern, restpattern)) {
    611 			*pathend = EOS;
    612 			continue;
    613 		}
    614 		err = glob2(pathbuf, --dc, restpattern, pglob);
    615 		if (err)
    616 			break;
    617 	}
    618 
    619 	if (pglob->gl_flags & GLOB_ALTDIRFUNC)
    620 		(*pglob->gl_closedir)(dirp);
    621 	else
    622 		closedir(dirp);
    623 	return(err);
    624 }
    625 
    626 
    627 /*
    628  * Extend the gl_pathv member of a glob_t structure to accomodate a new item,
    629  * add the new item, and update gl_pathc.
    630  *
    631  * This assumes the BSD realloc, which only copies the block when its size
    632  * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
    633  * behavior.
    634  *
    635  * Return 0 if new item added, error code if memory couldn't be allocated.
    636  *
    637  * Invariant of the glob_t structure:
    638  *	Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
    639  *	gl_pathv points to (gl_offs + gl_pathc + 1) items.
    640  */
    641 static int
    642 globextend(path, pglob)
    643 	const Char *path;
    644 	glob_t *pglob;
    645 {
    646 	register char **pathv;
    647 	register int i;
    648 	u_int newsize;
    649 	char *copy;
    650 	const Char *p;
    651 
    652 	newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs);
    653 	pathv = pglob->gl_pathv ?
    654 		    realloc((char *)pglob->gl_pathv, newsize) :
    655 		    malloc(newsize);
    656 	if (pathv == NULL)
    657 		return(GLOB_NOSPACE);
    658 
    659 	if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
    660 		/* first time around -- clear initial gl_offs items */
    661 		pathv += pglob->gl_offs;
    662 		for (i = pglob->gl_offs; --i >= 0; )
    663 			*--pathv = NULL;
    664 	}
    665 	pglob->gl_pathv = pathv;
    666 
    667 	for (p = path; *p++;)
    668 		continue;
    669 	if ((copy = malloc(p - path)) != NULL) {
    670 		g_Ctoc(path, copy);
    671 		pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
    672 	}
    673 	pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
    674 	return(copy == NULL ? GLOB_NOSPACE : 0);
    675 }
    676 
    677 
    678 /*
    679  * pattern matching function for filenames.  Each occurrence of the *
    680  * pattern causes a recursion level.
    681  */
    682 static int
    683 match(name, pat, patend)
    684 	register Char *name, *pat, *patend;
    685 {
    686 	int ok, negate_range;
    687 	Char c, k;
    688 
    689 	while (pat < patend) {
    690 		c = *pat++;
    691 		switch (c & M_MASK) {
    692 		case M_ALL:
    693 			if (pat == patend)
    694 				return(1);
    695 			do
    696 			    if (match(name, pat, patend))
    697 				    return(1);
    698 			while (*name++ != EOS);
    699 			return(0);
    700 		case M_ONE:
    701 			if (*name++ == EOS)
    702 				return(0);
    703 			break;
    704 		case M_SET:
    705 			ok = 0;
    706 			if ((k = *name++) == EOS)
    707 				return(0);
    708 			if ((negate_range = ((*pat & M_MASK) == M_NOT)) != EOS)
    709 				++pat;
    710 			while (((c = *pat++) & M_MASK) != M_END)
    711 				if ((*pat & M_MASK) == M_RNG) {
    712 					if (c <= k && k <= pat[1])
    713 						ok = 1;
    714 					pat += 2;
    715 				} else if (c == k)
    716 					ok = 1;
    717 			if (ok == negate_range)
    718 				return(0);
    719 			break;
    720 		default:
    721 			if (*name++ != c)
    722 				return(0);
    723 			break;
    724 		}
    725 	}
    726 	return(*name == EOS);
    727 }
    728 
    729 /* Free allocated data belonging to a glob_t structure. */
    730 void
    731 globfree(pglob)
    732 	glob_t *pglob;
    733 {
    734 	register int i;
    735 	register char **pp;
    736 
    737 	if (pglob->gl_pathv != NULL) {
    738 		pp = pglob->gl_pathv + pglob->gl_offs;
    739 		for (i = pglob->gl_pathc; i--; ++pp)
    740 			if (*pp)
    741 				free(*pp);
    742 		free(pglob->gl_pathv);
    743 	}
    744 }
    745 
    746 static DIR *
    747 g_opendir(str, pglob)
    748 	register Char *str;
    749 	glob_t *pglob;
    750 {
    751 	char buf[MAXPATHLEN];
    752 
    753 	if (!*str)
    754 		strcpy(buf, ".");
    755 	else
    756 		g_Ctoc(str, buf);
    757 
    758 	if (pglob->gl_flags & GLOB_ALTDIRFUNC)
    759 		return((*pglob->gl_opendir)(buf));
    760 
    761 	return(opendir(buf));
    762 }
    763 
    764 static int
    765 g_lstat(fn, sb, pglob)
    766 	register Char *fn;
    767 	struct stat *sb;
    768 	glob_t *pglob;
    769 {
    770 	char buf[MAXPATHLEN];
    771 
    772 	g_Ctoc(fn, buf);
    773 	if (pglob->gl_flags & GLOB_ALTDIRFUNC)
    774 		return((*pglob->gl_lstat)(buf, sb));
    775 	return(lstat(buf, sb));
    776 }
    777 
    778 static int
    779 g_stat(fn, sb, pglob)
    780 	register Char *fn;
    781 	struct stat *sb;
    782 	glob_t *pglob;
    783 {
    784 	char buf[MAXPATHLEN];
    785 
    786 	g_Ctoc(fn, buf);
    787 	if (pglob->gl_flags & GLOB_ALTDIRFUNC)
    788 		return((*pglob->gl_stat)(buf, sb));
    789 	return(stat(buf, sb));
    790 }
    791 
    792 static Char *
    793 g_strchr(str, ch)
    794 	Char *str;
    795 	int ch;
    796 {
    797 	do {
    798 		if (*str == ch)
    799 			return (str);
    800 	} while (*str++);
    801 	return (NULL);
    802 }
    803 
    804 #ifdef notdef
    805 static Char *
    806 g_strcat(dst, src)
    807 	Char *dst;
    808 	const Char* src;
    809 {
    810 	Char *sdst = dst;
    811 
    812 	while (*dst++)
    813 		continue;
    814 	--dst;
    815 	while((*dst++ = *src++) != EOS)
    816 	    continue;
    817 
    818 	return (sdst);
    819 }
    820 #endif
    821 
    822 static void
    823 g_Ctoc(str, buf)
    824 	register const Char *str;
    825 	char *buf;
    826 {
    827 	register char *dc;
    828 
    829 	for (dc = buf; (*dc++ = *str++) != EOS;)
    830 		continue;
    831 }
    832 
    833 #ifdef DEBUG
    834 static void
    835 qprintf(str, s)
    836 	const char *str;
    837 	register Char *s;
    838 {
    839 	register Char *p;
    840 
    841 	(void)printf("%s:\n", str);
    842 	for (p = s; *p; p++)
    843 		(void)printf("%c", CHAR(*p));
    844 	(void)printf("\n");
    845 	for (p = s; *p; p++)
    846 		(void)printf("%c", *p & M_PROTECT ? '"' : ' ');
    847 	(void)printf("\n");
    848 	for (p = s; *p; p++)
    849 		(void)printf("%c", ismeta(*p) ? '_' : ' ');
    850 	(void)printf("\n");
    851 }
    852 #endif
    853